Keepalived ChangeLog

Release 2.0.16
* Add log_unknown_vrids keyword.
  Commit 21e6f5f added logging when a VRRP packet was received on an
  interface and the VRID in the advert was not configured on that
  Due to valid uses of keepalived having a VRRP instance on an
  interface, but there being other, independent, VRRP instances with
  different VRIDs on the same interface, this patch only enables logging
  of unknown VRIDs if it is specifically configured.
* Stop segfault when reload and using -x option.
* Fix compilation error found by Travis-CI.
* Fix a couple of typos.
* Ensure check command line when needed for track process.
* Check if comm really changed when get PROC_EVENT_COMM_CHANGE.
* Fix debounce delay handling for track_process.
* Optimise add_process().
* Remove processes no longer being monitored.
* Optimise check_process().
* Ignore process threads for track_process.
* Allow matching of process parameters in track_process
  This additional functionality was requested in issue #1190.
* Allow separate delay timers for fork and process exit in
* Add quorum_max for track_process.
  This allows track_process to go to fault state if more than a
  specified number of instances of a process are running. In particular
  it can go to fault state if more than one instance is running, and
  also if any instance of a process is running.
* Add configuring process name.
  With up to 4 processes running all named keepalived, it can be
  difficult to know which is which. The commit adds the option to
  allow process name to be set independantly for each process.
* Handle macvlans/macvtaps being moved into different namespace from parent
  If a macvlan or macvtap interface is moved into a different namespace from
  its parent, and the interface is in the namespace in which keepalived is
  running, keepalived is unable to get information about, or configure, the
  parent interface. In this case, treat the macvlan/macvtap interface as though
  it doesn't have a parent interface.
  There are a couple of consequences of this in this situation:
    1) If a vrrp instance is configured with use_vmac and its configured interface
       is such a macvlan/macvtap interface, keepalived cannot ensure that the
       arp_ignore and arp_filter settings are correct on the parent
    2) keepalived cannot check that there a not duplicate VRIDs being used on the
* Typo writing word error fix.
* Add vrrp instance priority change notifications on FIFOs only.
  Issue #1213 requested notification of vrrp instance priority changes,
  and this commit implements that with new FIFO messages:
  This has been implemented via notify FIFOs only, since the order of
  processing of scripts is indeterminate if events happen quickly in
  succession, potentially causing the last processed priority by a
  script not to be the lastest priority, and using SMTP notification
  would be ridiculous.
* Allow user and group ownership of FIFOs to be configured.
* Remove extraneous debugging message from process_name commit
  Commit 4ad6d11 - "Add configuring process name" accidentally left
  a debugging log message in the code. This commit removes it.
* Fix FREE error if tracked process has no parameters.
* Fix track processes when reloading.
* Fix route add/delete on reload if only change via address
  If a virtual_iproute
  src via dev eth0
  is changed to
  src via dev eth0
  on a reload the route didn't get updated. The reason is that the
  via address wasn't used in the comparison of routes, so keepalived
  didn't detect that it had changed.
* Define TASK_COMM_LEN rather than use numbers in code.
* Fix promote_secondaries.
* Add snmpd.service to keepalived.service if SNMP enabled.
* Add issue templates for github.
* Make utils.c function parameters const where appropriate.
* Add missing info to check process dump file.
* Make ipvs_talk() error message more meaningful
  The error message used to just output the IPVS command number, now
  the name of the command is reported too.
* Make more use of LIST_FOREACH in ipwrapper.c.
* Change VS_ISEQ etc to be functions and correct them.
* Resolve removing virtual servers in virtual server groups after
* Update NOTE_vrrp_vmac.txt re sysctl settings.
* Ignore base interfaces of macvlans if in a different namespace.
* Don't lose sin_addr_l and sin6_addr_l lists from interface when recreate
  Issue #1232 identified that keepalived segfaulted when an interface was
  recreated. This commit resolves the problem of the address lists being
* Fix commit 128bfe6 for pre v4.0 kernels
  Commit 128bfe6 - "Ignore base interfaces of macvlans if in a different
  namespace" added using IFLA_LINK_NETNSID to detect if the parent of an
  interface was in a different namespace. Unfortunately that was only
  introduced in Linux v4.0, so don't attempt to use it if it is not
  For kernels older than v4.0 if a macvlan interface's parent is in
  another network namespace, but the ifindex of the parent interface also
  exists in the namespace in which keepalived is running, then keepalived
  will believe the parent of the macvlan is the wrong interface.
* Fix commit 3207f5c - IFLA_LINK_NETNSID is not #define'd
  This fixes commit 3207f5c - "Fix commit 128bfe6 for pre v4.0 kernels".
  A configure test is needed to check for IFLA_LINK_NETNSID.
* Further fixes/improvements for MACVLAN parents in different
* allow to set zero weight for real server.
* Add comments re needing to enable protocol 112 in an AWS security
* Check if base i/f of a residual macvlan is in correct namespace.
* Stop segfault if using DBus and have invalid VRRP configuration.
  If a VRRP instance was removed by vrrp_complete_init() it was causing
  a segfault in the DBus code. The commit moves the initialisation of
  DBus until after the validity of the VRRP instances has been checked.
* Handle DBus process properly when reloading.
  DBus may change from being enabled to disabled or vice versa and
  the code didn't handle that.
* Close DBus pipes when stop using DBus.
* Add some more LIST_FOREACH to DBus code.
* Move a g_free() to after last use of the freed string in vrrp_dbus.
* Fix error in man page.
* Handle network namespace name properly when reloading.
* Don't call g_hash_table_remove() when using g_hash_table_foreach_remove()
  g_hash_table_foreach_remove() removes each object from the hash table,
  so calling g_hash_table_remove() as well made it not work properly.
* Resolve various aspects of reloading when also using DBus.
  1. Add ability for DBus to be enabled and disabled at reload
  2. Correctly handle vrrp_instance name change for matching interface/
  3. Correct handling of interface/family/VRID change for a vrrp_instance
     with the same name.
* Resolve segfault when a vrrp_instance has no interface specified.
* Fix sending priority 0 adverts after reload for deleted vrrp
  During a reload, vrrp_dispatcher_release() was called prior to
  reloading the configuration, and it closed all the vrrp send/receive
  sockets. However it isn't until after the reload that it is known which
  vrrp instances no longer exist, and clear_diff_vrrp() attempted to send 0
  priority adverts for those instances. Since the sockets had already been
  closed, the adverts could not be sent. Worse, the socket_t structures had
  been released, but the released memory was accessed in attempting to send
  the adverts.
  This commit delays calling vrrp_dispatcher_release() until after the new
  configuration has been reloaded, and it sends 0 priority adverts before
  all the old sockets are closed. Following this new sockets are opened.
  It would be possible to make the code more efficient and retain the sockets
  that still need to be used, rather than closing them and opening new ones,
  but that is for another commit.
* Update some comments in vrrp_snmp.c.
* Use structure initialisation to clear struct, rather than memset.
* Fix logging if receive EPOLLHUP, EPOLLERR and add for EPOLLRDHUP.
* Add support for network timestamp debugging.
* Check return code from recvfrom() before other values for
* Use IPV6_RECVPKTINFO rather than IPV6_RECVHOPLIMIT when check
* Ensure virtual servers are properly removed when reloading.
  Pull request #1246 provided a patch to resolve the issue of virtual
  servers in a virtual server group that are deleted from the virtual
  server group on a reload weren't being removed from the IPVS
  configuration. However, the patch didn't quite work with the current
  HEAD of the master branch.
  This commit incorporates that patch provided and makes the necessary
  adjustments for it to work correctly.
* Cosmetic changes to IPVS code.
* Make clear the IPv6 instances use VRRP version 3.
* Delete redundant code.
* Update comments in vrrp_nftables.c.
* Update for gcc v9
  Detect if -Wchkp is no longer supported, and fix a -Wstrict-overflow
  warning in write_backtrace().
* Add additional compiler warnings available in gcc verion 9.
Release 2.0.15
* Fix uninitialised variable.
* Fix rpmbuild on CentOS7, and rely on auto-requires.
* Add option to flush lvs on shutdown.
  Currently all known virtual servers and their real servers are
  removed one at a time at shutdown. With large configurations on
  a busy system, this can take some time.
  Add an option just like the existing 'lvs_flush' which operates
  on shutdown. Typical environments with a single keepalived instance
  can take advantage of this option to achieve a faster shutdown or
  restart cycle.
* Make alpha mode checkers on new real servers start down on reload.
  Patch #1180 identified that new real servers with alpha mode checkers
  were being added online immediately, and if the checker then failed
  were being removed. This commit makes real servers that didn't exist
  before the reload start in down state if they have alpha mode checkers.
* Remove duplicate config dump entry.
* Make new real servers at reload start down if have alpha mode
* Close checker and smtp_alert sockets on reload.
  Issue #1177 identified that sockets were being left open (lost) after
  a reload. It transpired that these were sockets opened by TCP_CHECK,
  HTTP_GET, SSL_GET, DNS_CHECK and SMTP_CHECK checkers, and by smtp_alerts
  in the process of being sent.
  This commit adds an extra parameter to thread_add_read() and
  thread_add_write() to allow indicating that the scheduler should close
  the socket when destroying threads.
* Send vrrp group backup notifies at startup.
* Make inhibit_on_failure be inherited by real server from virtual
* Allow real and sorry servers to be configured with port 0
  This is to maintain backwards compatibility with keepalived prior
  to commit d87f07c - "Ensure always check return from inet_stosockaddr
  when parsing config".
  The proper way to configure this is to omit the port, which requires
  the next commit.
* Don't setup IPVS config with real and virtual servers ports
  If the real server is using DR or TUN, the port of the real server must
  be the same as the port of the virtual server. This commit uses the
  virtual server port for the real server when configuring IPVS.
* Log warnings if real server and virtual server ports don't match
  This commit adds logging warnings if virtual and real server ports,
  when using TUN or DR, don't match.
  It also sets the real server ports to be the same as the virtual server
  ports. Although listing the IPVS configuration with ipvsadm will look
  different, the kernel ignored the port of a real server when using DR
  or TUN, so the behaviour isn't changed, but when looking at the
  configuration it now shows what is actually happening.
* Fix warning when protocol specified for virtual server with fwmark.
* Add log message that nb_get_retry is deprecated.
* Fix whitespace in
* Fix configure error when systemd not installed
  configure was trying to execute
    pkg-config --variable=systemdsystemunitdir systemd
  even if systemd was not available.
  This commit makes configure only execute the above if it has determined
  that systemd is the correct init package to use.
* Correct references to RFC6527 (VRRPv3 SNMP RFC).
* nsure checker->has_run is always set once a checker has run.
* Fix some indentation in
* Update fopen_safe() to open temporary file in destination directory
  rename() in fopen_safe() was failing if the file being created
  was not on the same filesystem as /tmp.
* Add ${_RANDOM} configuration keyword.
  It might seem strange to introduce random elements to configuration
  files, but it can be useful for testing.
* Fix using ~SEQ() in multiline configuration definitions.
* Make blank lines terminate a multiline definition.
* Minor updates for lvs_flush_on_stop.
* Add option to skip deleting real servers on shutdown or reload
  If a virtual server is removed, the kernel will remove its real servers,
  so keepalived doesn't explicitly need to do so.
  The lvs_flush_onstop option removes all LVS configuration, whereas this
  new option will only remove the virtual servers managed by keepalived.
* Correct error message re checker_log_all_failures.
* Fix syntax error in
* Fix track_process initialisation for processes with PIDs starting 9.
* Remove debugging log message.
* Remove inappropriate function const attributes
  They were causing iptables/ipsets not to be initialised.
* Stop warning: function might be candidate for attribute ‘const’
  Depending on what configure options are selected, gcc can output
  the above warning for initialise_debug_options().
  This commit ensures that the warning is not produced.
* Enable strict-config-checks option in keepalived.spec RPM file.
* vrrp: relax attribute 'const' warning at iptables helpers.
* Propagate libm to KA_LIBS.
* Fix building on Alpine Linux.
  Alpine (musl) doesn't have a definition of __GNU_PREREQ, so create a
  dummy definition.
Release 2.0.14
* Add compiler warning -Wfloat-conversion and fix new warnings.
  It was discovered that passing 0.000001 as a parameter specified
  as uint32_t to a function did not generate any warning of type
  mismatch, or loss of precision.
  This commit adds -Wfloat-conversion and fixes 3 instances of new
  warnings that were generated.
* For non systemd enviroment, it occurs syntax error 'fi'.
  To avoid syntax error, modify
* When uninstall keepalived with init upstart, stop keepalived process.
* Fix type re LOG_INGO should be LOG_INFO * 6git stash --cached.
  The code was actualy in a #ifdef INCLUDE_UNUSED_CODE block, and
  so isn't currently compiled.
* Register missing thread function for thread debugging.
* Fix reutrn value of notify_script_compare misusing issue.
* Fix typo in keepalived.conf man page re BFD min_rx.
* Fix segfault when bfd process reloads config.
  Issue #1145 reported the bdf process was segfaulting when reloading.
  The bfd process was freeing and allocating a new thread_master_t
  when reloading, which doesn't work. This commit changes the bfd
  process to clean and reinitialise the thread_master_t.
* Fix segfault in handle_proc_ev().
  On Linux 3.10 the ack bit can be set in a connector message, and
  the CPU number is set to UINT32_MAX. This commit skips acks, and
  also checks that CPU number is within range of the number of CPUs
  on the system.
* Fix OpenSSL init failure with OpenSSL v1.1.1.
  OpenSSL v1.1.1, but not v1.1.0h or v1.1.1b failed in SSL_CTX_new()
  if OPENSSL_init_crypto(OPENSSL_INIT_NO_LOAD_CONFIG) had previously
  been called.
  This commit doesn't call OPENSSL_init_crypto() if doing so causes
  SSL_CTX_new() to fail.
* Remove all references to libnfnetlink.
  Commit 2899da6 (Stop using linbl for mcast group membership and
  setting rx buf sizes) stopped using libnfnetlink, but INSTALL and were not updated accordingly.
* Fix genhash re OPENSSL_init_crypto bug and improve
  Commit fe6d6ac (Fix OpenSSL init failure with OpenSSL v1.1.1) didn't
  update the identical code in genhash/ssl.c. Also, an improvement for
  the test in was suggested.
* Fix log output when real server removed.
  FMT_VS() and FMT_RS() both call inet_sockaddrtotrio which uses a
  static buffer to return the formatted string, but since FMT_VS(),
  wheich simply calls format_vs() copies the returned string to its
  own static buffer, if FMT_VS() was called before FMT_RS() then
  the returned strings from both could be used.
  The problem occurs when both FMT_VS() and FMT_RS() are used as
  parameters to log_message() (or printf etc). It appeared to work
  fine on x86_64, but was writing the same IP address for both the
  real server and virtual server on ARM architectures. This is due
  to the compiler evaluating parameters to the log_message() function
  call in a different order on the different architectures.
  This commit adds inet_sockaddrtotrio_r() which allows the output
  to be in a buffer specified by the caller, and so FMT_VS() and
  FMT_RS() can now be called in either order without one overwriting
  a buffer used by the other.
* Streamline some string formatting with FMT_RS() and FMR_VS().
  Following commit 9fe353d (Fix log output when real server removed)
  some code can be streamlined now that the order of calling FMT_VS()
  and FMT_RS() does not matter.
* Replace FMT_HTTP_RS(), FMT_TCP_RS() and FMT_DNS_RS() with FMT_CHK().
  They were all simply defined to be FMT_CHK() so just replace them
  with that. This made it much simpler to find all used of FMT_CHK().
* Fix building with gcc 4.4.7 (Centos 6.5).
  gcc v4.4.7 doesn't support -Wfloat-conversion, so check for it at
  configure time.
* Add dumping checker config/status when receive SIGUSR1.
* Don't put alpha mode checkers into failed state at reload
  If a new checker is added at a reload, unless the real server aleady
  has failed checkers, then ignore the alpha mode of the checker. This
  means that the real server, if up, won't be taken down and then brought
  back up again almost straight away. If the real server already has
  failed checkers, then setting an alpha mode checker down initially
  won't take down the real server, so we can allow the alpha mode setting
  to apply.
* Handle alpha mode checkers initial failure at startup better.
* Fix compile failure discovered by Travis-CI.
* Fix calling syslog when not using signalfd().
  Pull request #1149 identified that syslog is AS-Unsafe (see signal-safety
  man page), and that therefore signals should be blocked when calling it.
  This commit blocks signals when calling syslog()/vsyslog() when signalfd()
  is not being used.
* Rationalise function attributes.
* Fix enable-optimise configure option.
* Use AS_HELP_STRING for all options in
* Streamline genhash -h option.
* Make genhash -v version match keepalived.
* Fix config check of virtual server quorum against weights of real
* Fix some configure tested checks for OPENSSL_init_crypto.
* Add infrastructure for adding additional compiler warnings.
* Add standard and extra compiler warnings.
* Add and resolve missing-declarations and missing-prototypes warnings
  Approximately 16 additional functions are now declared static.
* Add and resolve old-style-definitions warnings
* Add and resolve redundant-decls warnings
* Add and resolve jump-misses-init warnings
* Add and resolve shadow warnings
* Add and resolve unsuffixed-float-constants warnings
* Add and resolve suggest-attribute=const warnings
* Add and resolve suggest-attribute=format warnings
* Add and resolve suggest-attribute=malloc warnings
* Add and resolve suggest-attribute=noreturn warnings
* Add and resolve suggest-attribute=pure warnings
* Add and resolve unused-macros warnings
* Add and resolve null-dereference warnings
* Add and resolve float-equal warnings
* Add and resolve stack-protector warnings
* Add and resolve strict-overflow=4 warnings
* Add and resolve pointer-arith warnings
  This particularly includes adding a number of bytes to a void *.
* Add and resolve cast-qual warnings
* Resolve additional warnings identified on Centos 6.5/gcc 4.4.7
* Remove static from zalloc()
* Fix some compiler warnings on Ubuntu Xenial, and add comments re
* Rename LIST parameters to lst in list_head.h to avoid upper case.
* Fix real server checkers moving from failed to OK on reload.
* add rs judgement in migrate_checkers.
* Detect connection failure in genhash and exit rather than loop.
* Add another function pure attribute.
* Fix sending notifies for vrrp instances at startup when in sync group
  Issue #1155 idenfified that notify scripts for vrrp instance transition
  to backup state when keepalived started up were not being sent if
  the vrrp instance was in a sync group. It was also the case that SNMP
  traps, SMTP alerts and FIFO notifies were not being sent either.
  This commit make keepalived send the initial notifies when the vrrp
  instance is in a sync group.
* Fix building keepalived RPM on Fedora 26.
  For some reason -fPIC is needed when testing for the presence of
* Add vrrp_startup_delay configuration option.
  Some systems that start keepalived at boot time need to delay the
  startup of the vrrp instances, due to network interfaces taking
  time to properly come up. This commit adds a global configuration
  option vrrp_startup_delay that delays the vrrp instances starting
  up, for the specified number of seconds.
* Handle checkers properly when reload immediately after startup.
* Streamline some of the SMTP checker code.
* Create separate checker for each host in SMTP_CHECK block
  Having multiple host entries in an SMTP_CHECK block is deprecated.
  This commit streamlines the SMTP_CHECK code by creating a separate
  SMTP checker for each host declared in the SMTP_CHECK block, so that
  apart from parsing the configuration, the code no longer handles
  multiple hosts per checker.
  The support for parsing configuration with multiple hosts is only
  enabled if WITH_HOST_ENTRIES is defined in check_smtp.c. It is
  currently enabled, but when support for multiple hosts in the
  SMTP_CHECK block is finally removed, it will simply be a matter of
  deleting all code in the WITH_HOST_ENTRIES conditional blocks.
* Make checker fail if ENETUNREACH returned by connect().
  The connect() call can return some immediate errors such as ENETUNREACH.
  These were not being treated as a failure of the checker, since the code
  used to assume that any non success return by connect() meant that the
  connection was in progress.
  by connect(), as meaning that the checker has failed.
* Don't set SO_LINGER with a timeout of 0
  SO_LINGER with a timeout of 0 causes a TCP connection to be reset
  rather than cleanly closed. Instead of specifying a timeout of 0,
  use 5 seconds, so that there is an orderly shutdown of the TCP
  connection, but the close socket doesn't remain in TIMED_WAIT state
  for more than a short time.
* nftables: fix build with kernel lower than 4.1.
* Remove dead code and cosmectics.
  Remove code marked as UNUSED where things simply go nowhere even if
  define is set. We keep for the moment UNUSED code related to debug
  helpers used during coding process.
Release 2.0.13
* Add BFD build option to keepalived.spec rpm file
  Issue #1114 identified that the keepalived.spec file was not being
  generated to build BFD support even if keepalived had been configured
  to support it.
* Copy tarball to rpmbuild/SOURCES when building in place
  It seems that even when building in place, rpmbuild expects the
  tarball to be in the rpmbuild/SOURCES directory.
* Fix configure check for __always_inline
* Handle interface MAC addresses changing
  When an interface is added to a bond interface, if it is the first
  interface added, the MAC address of the bond interface is changed
  to the MAC address of the added interface. When subsequent interfaces
  are added, their MAC addresses are changed to that of the bond
  Issue #1112 identified that if a bond interface is deleted and
  recreated, the gratuitous ARPs were sent with the wrong source MAC
  This commit now updates interface MAC addresses from the netlink
  RTM_NEWLINK messages, so that the correct MAC address is always
* Minor tidying up of opening gratuitous ARP socket.
* Streamline setting SOCK_NONBLOCK on vrrp sockets.
* Use netlink reported hardware address length for unsolicited NAs
  ETH_ALEN is correct for Ethernet type interaces, but is not right
  for Infiniband interfaces.
* Minor tidying up of opening gratuitous NA socket.
* Make gratuitous ARP/NA sockets non blocking
  keepalived shouldn't block when sending gratutious ARP/NA messages.
  It is better to lose the messages than for keepalived to block, so
  set the sockets non blocking.
* Use netlink provided broadcast address for gratuitous ARP
  If an interface has a non-standard broadcast address, we should
  honour it.
* Fix building on pre 3.10 kernels re track_process
  Issue #1119 reported that keepalived wouldn't build on CentOS 6.
  Various PROC_EVENT_* declarations were assumed to exist, some of which
  were not introduced until Linux v3.10. Most of them are not needed, but
  PROC_EVENT_COMM is used by the track_process code.
  This commit now checks for the existence of the PROC_EVENT_* declarations,
  but since keepalived uses PROC_EVENT_COMM, track_process is not supported
  prior to Linux v3.2.
* Make track_process work prior to Linux 3.2, but with limitations
  Prior to Linux 3.2 the PROC_EVENT_COMM event did not exist, which
  means that keepalived is unable to detect changes to process name
  (/proc/PID/comm) prior to Linux 3.2. most processes do not change
  their process name, and so using track_process prior to Linux 3.2
  is safe so long as the monitored processes are known not to change
  their process name.
* Stop configure failing when nftables is not supported.
* Streamline socket use with linkbeat.
  Previously the socket used for ioctls was opened and closed twice per
  poll if using MII or ETHTOOL polling, and once per poll if using ioctl
  polling. This commit opens the socket once at startup, uses that socket
  for all linkbeat polls, and closes it on termination.
* Enable linkbeat polling to work with dynamic interfaces.
* Add linkbeat_interfaces configuration block
  It was not possible to indicate that an interface that wasn't used
  as the interface of a vrrp instance, but was used either as a track
  interface, or for virtual/static ip addresses or routes should use
  linkbeat. This commit adds that capability.
* Add ability to specify linkbeat type in linkbeat_interfaces block.
* Add --disable-linkbeat configure option
  Does anyone use linkbeat anymore? This commit enables keepalived to
  be build without the linkbeat code.
* Don't remove link local IPv6 address from VMAC that isn't keepalived's
  If IFLA_INET6_ADDR_GEN_MODE isn't supported and a macvlan interface
  already had a (non-default) link local addresss and the link local
  address that matched the interface's MAC address was added, keepalived
  was removing it as soon as it was added. This commit stop keepalived
  removing the address when we shouldn't.
* Set configure init type correctly in keepalived.spec file.
* Fix handling of VMACs with multiple reloads
  If a configuration is loaded that has a VRRP instance using a VMAC,
  then the configuration is updated to remove that VRRP instance and
  keepalived reloads its configuration, then the configuration is
  updated again to reinstate the VRRP instance and the configuration
  is again reloaded, keepalived thought the VMAC interface still
  existed, whereas it was deleted following the first reload.
  This commit ensures that keepalived properly detects whether an
  interface exists following a reload.
* Remember more than one interface local address per interface
  Keepalived needs a local address for each interface it sends adverts
  on. If the address keepalived is using is deleted and another address
  is configured on the interface, then keepalived should start using
  that address. To do this, a list of configured address on each
  interfaces needs to be maintained.
* Don't consider VIPs as local addresses when restart after crash
  Keepalived maintains a list of addresses per interface that can be
  used as source adddresses for adverts. To build the list, keepalived
  reads the addresses configured on interfaces when it starts. However,
  if keepalived crashed it will have left VIPs configured on interfaces,
  and we don't want to use them as advert source addresses.
  This commit makes keepalived compare the addresses on interfaces
  to VIPs, and ignores any addresses that are VIPs.
* Fix removing left over VIPs at startup.
* Use read_timer() when parsing config where appropriate.
* Allow fractional warmup, delay_loop and delay_before_retry for checkers
  To shorten the real server monitoring interval, make it possible to specify
  decimal value for following items:
* Update connect_timeout configuration options
  Based on the patch submitted by this patch
  allows setting the connect_timeout to a resolution of micro-seconds.
  The patch also adds the ability to set a default value at the virtual
  server and real server levels.
* Fix unused variable warning when building only with RFC compliant
* It enable to set zero value as mintime for delay_loop and connect_timeout.
* Add option not to check for EINTR if using signalfd()
  If keepalived is using signalfd(), there are no asynchronous signal
  handlers, and therefore EINTR cannot be returned.
  Currently the check for EINTR is enabled by default, and configure
  option --disable-eintr-debug disables the check, while
  --enable-eintr-debug enables writing log entries if EINTR is returned.
  Once sufficient testing has been performed, the default will be
  changed not to test for EINTR if signalfd() is supported.
* Make checking for EAGAIN/EWOULDBLOCK consistent
  The code in some places checked errno for EAGAIN and EWOULDBLOCK
  and in other places only checked EAGAIN. On Linux EAGAIN == EWOULDBLOCK,
  so the check is not necessary, but EAGAIN is not guaranteed to be the
  same value as EWOULDBLOCK, so define check_EAGAIN that only checks EAGAIN
  if they are the same value, but checks both if they are different.
* Ensure default connection timeout for smtp checker hosts set.
* Set default connection timeout if no smtp check host specified.
* Fix min timer value, zero to 0.000001Sec.
* Add fixing min time for vs_co_timeout_handler() and rs_co_timeout_handler().
* Fix parameter of read_timer(), it treat Mintime and Maxtime as microseconds.
* vrrp: vrrp_dispatcher_read() performance extension
  We took time with Quentin to simulate and rework this code. We introduced
  2 imbricated while loop:
  (1) First one is catching recvfrom EINTR (this code trig
      only on kernel older than 2.6.22 where signalfd was firstly introduced).
      Newer kernel will immediately break the loop (hey guys: if you are running
      older than 2.6.22 it is worth considering upgrading).
  (2) Second loop will continue reading from socket until same VRID advert
      has been received during the same cycle. After simulating, it appears that
      during contention with a lot of VRRP instances (around 1500), this design
      is needed to relax socket recvq from growing. This can be viewed as a
      Poll-Mode activation during contention and fallback to regular I/O MUX
      during normal operations. This loop breaks immediately and re-submit
      opration to I/O MUX when there is no more to be read.
* Fix conversion from long for double in read_timer().
* Remove variable timer of unsigned long cast in read_timer().
  When Double type variable timer is cast to long type, it's scale falls.
Release 2.0.12
* Documentation related.
  Remove keepalived.conf.SYNOPSIS content to make a pointer to manpage.
  Update README manifest to reflect actual Keepalived goal and features.
* Improve error message if process events connector not enabled in
* Add option to disable track-process functionality
  Issue #1099 reported that their kernel did not support the proc events
  connector, and it would therefore be helpful to have an option to build
  keepalived without the track-process functionality.
  This commit adds the --disable-track-process configure option.
* Fix vrrp instances going to fault state when have virtual routes
  If an interface going down caused a vrrp instance to go to fault
  state, and the vrrp instance also had virtual routes, the state
  of the vrrp instance would be set to backup when the deletion of
  the virtual route was detected. This commit ensures that the vrrp
  instance stays in fault state until the interface is brought up
* Remove Red Hat Linux 9 and RH Enterprise Linux 3 from spec file.
  Red Hat Linux 9 and Red Hat Enterprise Linux 3 are both based on
  Linux 2.4, which is no longer supported by keepalived. The options
  in the spec file for Reh Hat Linux 9 have twice caused people to
  specify wrong options to configure when trying to build keepalived,
  so the options are removed to i) avoid confusion and ii) they are
  not longer relevant.
* Add global option vrrp_min_garp.
  By default keepalived sends 5 gratuitous ARP/NA messages after
  transitioning to master, and 5 more 5 seconds later. This isn't
  necessary with modern switches, and so if the vrrp_min_garp option
  is set, only one gratuitious ARP/NA message is sent after transition
  to master, and no repeat messages are sent 4 seconds later.
* Standardise definition of _INCLUDE_UNUSED_CODE_
* Remove out of date comment re VRRP over IPv6.
* Correct typo in keepalived.conf.5.
* Directly use structure sizes for packet header lengths.
* vrrp_state_fault_rx() is not used.
  Wrap the function in conditional compilation so it is not compiled
* Convert so list loops to use LIST_FOREACH.
* Don't recalculate vrrp packet header address.
  vrrp_get_header() calculates the address of the vrrp header in a
  received packet, but it was being recalculated in vrrp_in_chk().
  This commit passes the already calculated address to vrrp_in_chk().
* Ensure a received packet has an AH header if and only if AH auth.
  Ensure that a received packet has an AH header if we expect AH
  authentication, and doesn't have an AH header if we don't expect
  AH authentication.
* Ensure all protocol headers received before return pointer to vrrp header
  vrrp_get_header() returns a pointer to the vrrp header, but it now returns
  NULL if insufficient data has been received to include all the (IP,
  possibly AH, and VRRP) headers (this does not include the VIPs in the VRRP
  This means that when a pointer to the VRRP header is returned, all fields in
  all protocol headers can safely be accessed.
* Add check of received IPv6 hop count in multicast adverts
  The VRRP RFC requires that IPv6 hop count MUST be checked to be 255,
  just as the TTL for IPv6 must be 255. Previously that wasn't being
  checked, since IPv6 raw sockets don't provide access to the IPv6
  Using recvmsg() rather than recvfrom(), and setting socket option
  IPV6_RECVHOPLIMIT allows keepalived to receive the hop count as
  ancillary data, and that can now be checked.
* Improve reading from vrrp receive sockets.
  Previously no check was made of the return value from recvfrom()/
  recvmsg(). This meant than an error could occur (e.g. EINTR), or no
  data might be returned, and keepalived would still attempt to process
  the receive buffer as though data had been received.
* Enhance and streamline checking of validity of received VRRP packet
  This includes checking that a packet is multicast, unless unicast is
  expected in which case it is checked for unicast, ensuring that if
  AH authentication is used, the next header protocol is VRRP.
  The sequence of some checks is revised to ensure that the fields being
  checked are valid to be accessed prior to accessing them, e.g. check
  that the packet is VRRP version 2 before checking the authentication.
* Stop clearing receive buffer before receiving VRRP packets.
  This is no longer necessary now that the appropriate checks are
  made of the return status of recvmsg(), and also that the checks
  of received packet length and packet headers now do all necessary
* Add compile time checks for IPV6_RECVHOPLIMIT/IPV6_RECVPKTINFO
* Update build-requires.
  The kernel package required for building keepalived is kernel-headers
  not kernel-devel. Also, it is superfluous to have package kernel in
  the build-requires!
* Add missing file (build.setup) to tarball.
* Fix calculating print format to rlim_t in
* Fix compiler warnings on 32 bit systems re HASH_UPDATE.
  Removing all the casts stopped the warnings.
* Use PRI_rlim_t when printing rlim_t types.
* Use %zd/%zu for ssize_t/size_t to avoid warnings on 32 bit systems.
* Fix some space/tab formatting.
* Stop declaring some timer definitions unsigned to stop compiler
  TIMER_HZ, TIMER_CENTI_HZ, NSEC_PER_SEC were causing some compiler warnings
  on some systems due to being defined with a 'U' unsigned suffix. Removing
  the unsigned specifier stopped the compiler warnings.
* Fix compiler warning due to incorrect format specifier.
  An int64_t should use % PRIi64 and not %ld
* Stop an uninitialized variable compiler warning.
* Fix MEM_CHECK debugging on processors without unaligned memory
* Don't attempt to use unopened socket for getting ipset version.
* Tidy up an error message.
* vrrp: make vrrp_dispatcher_read() async while catching error.
  During investigations we decided to update previous patch to resubmit
  into I/O MUX on read error. It will make read procedure I/O MUX freindly
  by removing potential sync operation potentially leading to a global
  I/O MUX desync. We aggreed, the situation is really and very exceptionnal
  but could happen.
* vrrp: vrrp_arp_thread split.
  Split the function for maintainability purpose.
Release 2.0.11
* Fix segfault while shutting down when SNMP activity occurs.
  Issue #1061 identified that keepalived could segfault when it
  shut down. It appears that this was caused by data being received
  on the file descriptors that the snmp agent requests keepalived
  to monitor with epoll(). Since the read threads weren't being
  processed during a shutdown, the first time an snmp fd was ready,
  keepalived discarded the read thread. The second time that fd became
  ready there was no thread to handle the fd, and, since the assert()
  statement was not compiled in, non existant data was queued to the
  thread ready queue.
  This commit changes the assert() calls to continue, so that non existant
  data is no longer queued to the thread ready queue.
* While shutting down, continue to handle snmp agent fds.
  Since we don't shutdown the snmp connection until the very end of
  the shutdown process (we need to be able to send snmp traps), we
  should continue to handle the snmp fds on behalf of the snmp agent
  while shutting down.
* Ensure snmp agent is in correct state when initialising/closing
  Make sure the snmp agent is not already initialised before
  initialising it, and make sure it has been initialised before
  closing it.
* Disable asserts in bfd code by default and add --enable-asserts
  Asserts were enabled by default in the bfd code, which shouldn't be
  the case.
  Add --enable-asserts configure option so that the asserts tests can
  be enabled while debugging.
* Remove debugging log message accidently left in.
* Update receive buffers when interface is created.
  The receive buffer size used by keepalived is based on the largest
  MTU of any interface that keepalived uses. If dynamic interfaces
  are being used and an interface is created after keepalived has
  started, the MTU of the new interface may be larger than the
  previous largest, so the receive buffer may need to be increased
  in size.
  Further, if vrrp_rx_bufs_policy is MTU, then the kernel receive
  buffers on the receive socket may need to be increased.
* Handle MTU sizes being changed.
  Issue #1068 identified that the MTU size wasn't being updated in
  keepalived if it changed.
  This commit now updates the MTU size and adjusts receive buffer
  sizes accordingly.
* Fix syntax error in
* Fix double free when global data smtp_helo_name copied from local_name
  Issue #1071 identified a double free fault. It occurred when smtp_helo_name
  was not set, in which case it was set to point to the same malloc'd memory
  as local_name. At termination keepalived freed both local_name and
  If keepalived needs to use local_name for smtp_helo_name it now malloc's
  additional memory to copy the string into.
  ulibC defines TIMER_MAX, so to avoid naming conflict rename it.
  This issue was reported by Paul Gildea  who also
  provided the patch.
* Fix segfault when smtp alerts configured.
* First working version of nftables.
* Restructed code around how iptables/nftables are called
  This commit also allows building keepalived without iptables
  support, thereby allowing only nftables support.
  Adding any other mechanism to handle no_accept mode, i.e. blocking
  receiving and sending to/from VIPs should be added to vrrp_firewall.c,
  in a similar way to how nftables/iptables are used.
* Update doc files re nftables.
* Make nftables handle dont_track_primary appropriately.
* Fix config reload with nftables.
* Set base chain priorities from configuration.
* Use iptables by default if neither iptables or nftables configured.
  But if the build of keepalived does not include iptables, then use
  nftables default.
* Stop dumping keywords - left turned on after debugging.
* Make umask configuration apply to created file.
* Add libmnl and libnftnl to travis file.
* Fix compilation failure when NFTNL_EXPR_LOOKUP_FLAGS not defined.
* Fix compilation failure when build with nftables but without iptables.
* Fix order of include files in configure COLLISION test.
  Since Linux 4.4.11 (commit 1575c09) including linux/if.h after
  net/if.h works, whereas until glibc fix their headers including
  net/if.h after linux/if.h causes compiler redefinition errors.
  Unfortunately the test for the collision was done the wrong way
  round, as identified in issue #1079. The patch included in the
  issue report corrects the order of inclusion of the header files.
  What we should do is ensure that glibc header files are included
  before Linux header files, so that at least if kernel headers from
  4.4.11 onwards are used, the conflict will not occur.
* Set CLOEXEC on netlink sockets.
* Correct error message for invalid route metric.
* Add track_process for vrrp to monitor if another process is running.
  Configurations frequently include a track_script to check that a process
  is running, often haproxy or nginx. Using any of pgrep, pkill, killall,
  pidof, etc, has an overhead of reading all /proc/[1-9]*/status and/or
  /proc/[1-9]*/cmdline files. In particular reading the cmdline files
  has a significant overhead on a system that is swapping, since the
  cmdline files provide access to part of the address space of each
  process, which may need to be fetched from the swap space.
  This commit reads the /proc/[1-9]*/stat and/or the /proc/[1-9]*/cmdline
  files only when keepalived starts, and after that uses the process events
  connector to track process creation and termination.
  keepalived will ignore zombie processes, whereas pgrep etc include them.
  A minimum number of instances of a process can be specified, and also a
  delay so that if a process is restarted, it won't cause monitoring vrrp
  instances to immediately transition to fault state but to wait the
  configured time and it the monitored process starts again it
  won't transition to fault state.
  There are potential difficulties with the process event connector if a
  large number of process events occur very rapidly, since there can be
  a receive buffer overrun on the netlink socket. This code will detect
  that happening, increase the receive buffer size, and reread the processes
  from /proc.
* Add missing #include to track_process.c.
* Fix number of elements of fd_set read for snmp select info.
* Remove thread_event_t when EPOLL_CTL_DEL fails.
  If snmpd closes a file descriptor, when keepalived attempts to
  unregister the fd from epoll an error is returned. However, we still
  need to remove the thread_event_t from the io_events rbtree.
* Fix connection to snmpd after it has to reconnect.
  Issue #1080 identified that keepalived wasn't handling a connection
  failure and reconnect to snmpd properly. The problem was created when
  the change from select() to epoll() was made.
  This commit makes keepalived unregister and reregister the snmp file
  descriptors after snmpd reconnects.
* Fix retry count for SMTP_CHECK checker.
  The checker was doing one too few retries.
* Make healthchecker failure reporting consistent
  Some healthcheckers were reporting all failures, and others only when
  the retries expired. This commit by default makes the checkers only
  report failure when the retries expire, unless the global keyword
  checker_log_all_failures or log_all_failures on the specific checker
  is configured.
* After reload, reinitialise current track processes state.
* Remove unused variable in track_process.c.
* Add configure checks re --with-kernel-dir.
* Convert remaining select() to epoll_wait().
  keepalived was using select() for handling the termination of child
  processes, but the main scheduling loop now uses epoll_wait(), so
  convert the select() to epoll_wait() from consistency.
* Stop keepalived leaving zombie child processes.
  keepalived wasn't reaping the termination of its child processes,
  so this commit adds waitpid() calls once it knows the processes
  have terminated.
* Fix make distclean and make distcheck.
* Also skip route not configured with down interface.
  Otherwise, if keepalived has virtual_routes configured, we create
  a virtual interface and bring it up and down, current code will bring
  VRRP state to FAULT and never return.
* Stop vrrp process entering infinite loop when track script times out
  Issue #1093 identified that the vrrp process was entering an infinite
  loop after a track script timed out. This was due to a child process
  thread having an RB tree for PIDs as well as for the timeout, and if
  a child process timed out, the thread wasn't being removed from the
  PID RB tree. This commit now ensures it is removed.
* Fix the abbreviation of Shortest Expected Delay.
* Don't free unallocated memory if not tracking processes.
* vrrp: Rewrote JSON code
  Remove dependency to json-c extralib by using a simple streaming JSON writter.
  Refactored code to make it simple to maintain.
* vrrp: Fix JSON handling for v{route;rule}.
* autoconf: fix nftables selection
  We need to inhibit nftable compilation if compiling system has
  kernel header file nf_tables.h but not libnftnl nor libmnl.
Release 2.0.10
* Fix compiling on Alpine Linux.
* Stop printf compiler warning on Alpine Linux due to rlim_t. 
* manpage cosmetic.
* Fix removing snmpd read threads when snmpd becomes unavailable.
* Update to support libipset version 7.
* Use ipset_printf for ipset messages so can go to log. 
* When opening files for write, ensure files can only be read by root.
  Issue #1048 referred to CVE-2018-19046 regarding files used for
  debugging purposes could potentially be read by non root users.
  This commit ensures that such log files cannot be opened by non root
* Disable fopen_safe() append mode by default 
  If a non privileged user creates /tmp/keepalived.log and has it open 
  for read (e.g. tail -f), then even though keepalived will change the
  owner to root and remove all read/write permissions from non owners, 
  the application which already has the file open will be able to read 
  the added log entries.
  Accordingly, opening a file in append mode is disabled by default, and
  only enabled if --enable-smtp-alert-debug or --enable-log-file (which
  are debugging options and unset by default) are enabled.
  This should further alleviate security concerns related to CVE-2018-19046.
* vrrp: add support to constant time memcmp. 
  Just an update to use best practise security design pattern. While
  comparing password or hmac you need to ensure comparison function
  is time constant in order to figth against any timing attacks. We
  turn off potential compiler optimizations for this particular
  function to avoid any short circuit.
* Make sure a non privileged user cannot read keepalived file output
  Ensure that when a file such as /tmp/ is wriiten,
  no non privileged can have a previous version of that file already 
  open, thereby allowing them to read the data.
  This should fully resolve CVE-2018-19046.
Release 2.0.9
* Fix updating a timer thread's timeout.
  Issue #1042 identified that the BFD process could segfault. This
  was tracked down to a timer thread which had already expired having
  its timeout updated by timer_thread_update_timeout().
  The sands timer should only be updated if the thread is on a waiting
  queue, and not if it has already timed out or it is unused.
* Don't requeue read thread if it is not waiting.
  This update matches commit 09a2a37 - Fix updating a timer thread's
  timeout should.
* Allow BFD instance to recover after send error.
  If sendto failed in bfd_send_packet(), the bfd instance was put into
  admin down state, but there was no means for the bfd instance to
  transition out of admin down state.
  This commit makes keepalived log the first instance of a sequence of
  failures to send a bfd packet, but does not bring the bfd instance down
  in case the error is a transient error. If the error is longer lasting,
  the remote system will timeout, transition to down state, and send a message
  saying it is down.
  Once the bfd instance can start sending again the bfd instance can now
  transition again to up state.
* Make DGB definition use log_message() rather than syslog().
* Fix building with --enable-debug configure option.
* Start list of required kernel features in INSTALL file.
  Issue #1024 asked what kernel features are needed to support keepalived.
  The simple answer was that it isn't recorded anywhere, so this is a
  start of making a list of the features required.
* Make list_remove() call list free function and add list_transfer().
  If an element is being removed from a list, the free function should
  be called.
  list_transfer() allows a list element to be moved from one list to
  another without freeing and reallocating the list element control
* Add mem_check diagnostics re calling functions of list functions.
  When using mem_check, mallocs and frees were recorded against the
  list functions, and the originating functions weren't identified.
  This patch adds recording of the functions calling the list
  functions so that the originating function is identified.
* Simplify the processing of comments in configuration files.
  This commit moves the handling (and removal) of comments to a
  single function (called from read_line()) which simplifies the
  processing of config files.
* Add ~SEQ(start, step, end) config functionality
  Where a configuration has repeated blocks of configuration where
  the only thing that changes is a numeric value (e.g. for VRIDs
  from 1 to 255) this allows the block to be defined once, and a
  single line using ~SEQ can then generate all the blocks.
* Use REALLOC when building a multiline definition.
  The code used to use MALLOC, strcpy() and FREE, but REALLOC can do
  all this for us.
* Improve mem-check diagnostics.
  When using an allocation list of over 50,000 entries, it was quite slow
  searching thtough all the entries to find the matching memory allocation,
  and to find free entries. This commit changes to using malloc() to create
  entries, and a red-black tree to hold the entries. It also has a separate
  list of free entries.
  This commit also adds 4 more types of memory allocation error, and
  improves the consistency of the entries in the log files.
* Don't attempt to delete VMAC when underlying interface is deleted.
  If the underlying interface of one of our vmacs is deleted, and we
  know the vmac has been deleted, don't attempt to delete it again.
* Include master state in determining if vmacs are up or down
  Netlink doesn't send messages for a state change of a macvlan when
  the master device changes state, so we have to track that for
* Turn off parser debugging.
* Make test/mk_if create iptables chains.
* Handle interfaces not existing when keepalived terminates.
  If the underlying interface of a vmac we created has been deleted,
  the vmac will not exist so don't attempt to delete it again. Also,
  don't attempt to reset the configuration of the underlying interface.
* Handle the underlying interface of a macvlan interface going up/down.
  The kernel doesn't send netlink messages for macvlans going up or
  down when the underlying interface transitions (it doesn't even
  update their status to say they are up/down), but the interfaces
  don't work. We need to track the state of the underlying interfaces
  and propagate that to the macvlan interfaces.
* Fix duplicate value in track_t enum.
* Fix check for matching track types.
* Treat macvtap interfaces in the same way as macvlan interfaces.
* Improve handling of interfaces not existing when keepalived starts.
* Fix handling interface deletion and creation of vmacs on macvlan i/fs.
* When interface created, open sockets on it if used by VRRP directly
  If an interface is created that has vrrp instances configured on it
  that don't use VMACs, or use vmac_xmit_base, then the raw sockets
  must be opened.
* Force seeing a transition to up state when an interface is created.
* Fix netlink remnant data error.
* Add command line and configuration option to set umask.
  Issue #1048 identified that files created by keepalived are created
  with mode 0666. This commit changes the default to 0644, and also
  allows the umask to be specified in the configuration or as a command
  line option.
* Fix compile warning introduced in commit c6247a9.
  Commit c6247a9 - "Add command line and configuration option to set umask"
  introduced a compile warning, although the code would have worked OK.
* When opening files for write, ensure they aren't symbolic links.
  Issue #1048 identified that if, for example, a non privileged user
  created a symbolic link from /etc/ to /etc/passwd,
  writing to /etc/ (which could be invoked via DBus)
  would cause /etc/passwd to be overwritten.
  This commit stops keepalived writing to pathnames where the ultimate
  component is a symbolic link, by setting O_NOFOLLOW whenever opening
  a file for writing.
  This might break some setups, where, for example, /etc/
  was a symbolic link to /home/fred/ If this was the case,
  instead create a symbolic link from /home/fred/ to
  /tmp/, so that the file is still accessible via
  There doesn't appear to be a way around this backward incompatibility,
  since even checking if the pathname is a symbolic link prior to opening
  for writing would create a race condition.
* Make netlink error messages more meaningful.
* Fix compiling without support for macvlans.
* fix uninitialized structure.
  The linkinfo and linkattr structures were not initialized,
  so we should not expect that unexistant attributes are set
  to NULL. Add the missing memset().
* fix socket allocation with dynamic interfaces.
  When there are several vrrp instance binding different interfaces that
  don't exist at startup, their ifindex is set to 0 in the sock. The
  function already_exist_sock() that lookup for an existing socket will
  always return the first sock because the ifindex is the same.
  Later, when an interface appears, the fd will be created for one
  instance, and all instances will wrongly use this fd to send the
  Fix this by using the interface structure pointer instead of the
  ifindex as the key for sock lookup.
  The problem was identified by Olivier Matz 
  who also provided a patch fixing the problem. This patch is a slight
  rework of Olivier's patch, better using the existing data structures
  that keepalived already holds.
* When creating a macvlan interface, use AF_UNSPEC rather than AF_INET.
* Stop using libnl for configuring interfaces.
  Since there is code to configure the interfaces using netlink without
  using libnl, there is no point in having code to do it using libnl.
* Fix building on Centos 6.5.
* Stop including some files not needed after libnl removal for i/fs.
* Fix some compilation issues when building without vrrp support.
* Stop using linbl for mcast group membership and setting rx buf sizes.
  Since there is code to handle multicast group membership and
  setting kernel netlink receive buffer sizes without using libnl,
  This now means that the vrrp functionality no longer uses libnl.
* Add some sanity checking of configure options.
  Certain invalid combinations of configure options could cause compile
  errors, e.g. --disable-vrrp --enable-vrrp-fd-debug. This commit ensures
  that invalid combinations aren't allowed, in order to stop the compile
* Fix invalid configuration combination caught by previous commit.
* Use netlink to set/clear rp_filter on interfaces.
* Fix configure for building without vrrp.
* Actually update the .travis.yml file to fix the problem.
* Fix conditional compilation re epoll-thread-dump debugging.
* Update INSTALL file now no longer use libnl-route-3.
* Stop cast to incompatible function type warnings from gcc 8.1.
* Update snapcraft.yaml not to include libnl-route-3.
* keepalived exit with non-zero exit code if config file not readable.
* Allow specifying default config file at configure time.
* Use keepalived define for exit code when malloc failure.
* Fix configuring fixed interface type.
* Add configuring keepalived default configuration file.
* Fix return value in get_time_rtt() error path.
* Update generation of git-commit.h.
* snapcraft.yaml: Enable all sensible build options. Preserve build time
  version in the snap version. Expose genhash.
* snapcraft.yaml: Build keepalived with Linux 3.13 headers.
* snap: Add an install hook to make sure a keepalived configuration exists.
* snap: Move the hooks to the correct location.
* snap: Make sure /etc/keepalived exists.
* Fix building with IP_MULTICAST_ALL in linux/in.h but not netinet/in.h
  Issue #1054 identified that configure was checking the definition of
  IP_MULTICAST_ALL in linux/in.h but including netinet/in.h, which also
  has the definition, but only from glibc 2.17.
  This commit creates a local definition (in lib/config.h) of IP_MULTICAST_ALL
  if it is defined in linux/in.h but not in netinet/in.h. The reason for
  this is that compiles using linux/in.h fail due to conflicting definitions.
* Fix creating iptables tables in mk_if.
* Update .travis.yml to use xenial.
* Update .travis.yml to add --enable-regex option.
* Tidy up .travis.yml file.
* snap: Build multiple keepalived binaries.
* Updated snapcraft builds to support multiple kernel versions.
Release 2.0.8
* Improve identifing interface as macvlan when reading interface details
* Enslave a VMAC to the VRF master of the underlying interface.
* Use addattr32 rather than addattr_l for if_index.
* Only include VRF support if kernel headers support it.
* Fix --enable-timer-debug configure option.
* Fix some enable option tests.
* Include stdbool.h in process.c.
* Fix diagnostic message re ignoring weight of tracked interface.
* Fix track_bfds with weights.
* Correct conditional compilation definition name.
* Fix memory leak in HTTP_GET/SSL_GET.
* Fix two memory leaks in DNS_CHECK.
* Don't consider retries for BFD_CHECK. The BFD_CHECKer doesn't support
  retries, and the check was causing the checker not to transition to
  down state.
* Fix memory leak with BFD_CHECK.
* Restart global notify FIFO handler after reload.
* Fix compiling without BFD support.
* Stop bfd process sending double the number of packets.
  If a bfd process received an initial bfd packet, it scheduled a
  second bfd_sender_thread thereby causing two packets to be sent
  in every interval.
* Use timerfd for select timeouts rather than select timeout parameter
  This is a precursor to moving to using epoll.
* Use epoll rather than select.
  epoll is both more efficient than select and also doesn't have a
  file descriptor limit of 1024, which limited the number of vrrp
  instances that could be managed.
  This commit also introduces read-black trees and the list_head
  list type.
* Add --enable-timer-check option for logging calls for getting time
  Calls to update the current time from the kernel are made too
  frequently, and this patch logs when the calls are made, and how
  long since the previous call, so unnecessary calls can be removed.
* Add debug option for monitoring epoll queues.
  This is enabled by --enable-epoll-debug and replaces
* Use system monotonic clock to generate a monotonic clock.
  Rather than have our own code for creating a monotonic clock, use
  the kernel's monotonic clock.
* Make some functions in timer.c inline.
  The functions had one line of code so inlining them is more
* Fix requeueing read and write threads after read/write timeouts.
* Fix initial allocating and final freeing of thread_master epoll_events.
* When cleaning up threads, also clean up their thread_events.
* Add thread_close_fd() function to release thread_event_t on close
  When a file descriptor that has been monitored by epoll is closed
  the thread_event_t structure used for managing epoll for that fd
  has to be release. Therefore calls to close() and replace by calls
  to thread_close_fd().
* Make parent process write log entry when it is reloading.
* Move checking for thread timeouts to timerfd_handler
  There is no point in checking for thread timeouts if the timerfd
  isn't readable; in other words only check for thread timeouts if
  the timer has expired.
* Make bfd reschuling timer threads more efficient.
* Streamline DNS_CHECK code.
* Fix buffer overrun with track file path names.
* Add timestamp when writing mem_check entries to file.
* Ensure thread_event_t released for ready threads at termination.
* Increase open file limit if large number of VRRP instances.
  Each VRRP instance can use up to 2 file descriptors, and so if there
  are more than 500 ish VRRP instances the number of open files
  can exceed the default per process limit (1024 on my system).
  The commit allows 2 file descriptors per vrrp instance plus a few more,
  and if the RLIMIT_NOFILE value returned by getrlimit isn't high enough,
  keepalived will increase the limit.
* Ensure that child processes run with standard priorities/limits.
  When child processes such as notify scripts, track_scripts and
  MISC_CHECK scripts are run, they should not inherit any elevated
  priorities, system limits etc from the parent keepalived process.
* Change multiple spaces to tabs in scheduler.h.
* Add family to sockpool listing.
* Fix a multiline definition expansion issue.
* Free allocated cache when closing/freeing netlink socket.
  When running on a system with 500+ interfaces configured and adding
  1000 VMAC interfaces, the heap was growing by 340Mb due the netlink
  cahce not being freed after creating each VMAC interface. With this
  patch the heap only grow by 3.7Mb (if creating 1000 VMAC interfaces
  the heap grep by 905Mb now reduced to 6.1Mb).
* Stop using netlink cache when adding and configuring VMAC interfaces.
  When running on a system with 500+ interfaces configured and adding
  1000 VMAC interfaces, it was taking 2.3 seconds to add the interfaces.
  Without populating a netlink cache each time a VMAC interface is created
  it now takes 0.38 seconds to add the interfaces (if creating 1000 VMAC
  interfaces it was taking 6.1 seconds, now reduced to 0.89 seconds, and
  the heap growth is reduced from 6.1Mb to 3.9Mb).
* Add function rtnk_link_get_kernel for dynamic linking.
* Fix compiling without JSON support.
* Add support for recording perf profiling data for vrrp process.
* Add comment re usage of MAX_ALLOC_LIST.
* Some streamlining of scheduler.c.
* Merge --enable-epoll-debug and --enable-dump-threads functionality.
* Let thread_add_unuse() set thread type, and use thread_add_unuse() more.
* Use break rather than return in process_threads().
* Fix segfault when reloading with HTTP_GET and no regex configured.
* Merge the next-generation scheduler.
* Make all debug options need enabling at runtime.
  Previously if configure enabled a debug option its output was always
  recorded, which meant that if one didn't want the output, configure/
  compile was needed. This commit adds command line options that need to
  be set in order to turn the debugging on.
* Remove unwanted debug message.
* Fix parsing --debug options.
* Fix rb tree insertion with timers.
* Add missing functions for thread debugging.
* Add vrrp instance VMAC flags when dumping configuration.
* Ensure parent thread terminates if child has permanant config error.
* Ensure don't delete VMAC interface if keepalived didn't create it.
  and sundry fixes.
* If receive lower priority advert, send GARP messages for sync group.
  A recent update to issue #542 identified that following recovery
  from a split brain situation, GARP messages weren't being sent. It
  transpired that, if a member of a sync group in master state received
  a lower priority advert and vrrp_higher_prio_send_advert is set, a
  further (lower priority) advert is sent, and the instance and all the
  members of the sync group transition to backup (the other members of
  the sync group don't send a further advert since they haven't received
  a higher priority advert). This meant that the other members of the
  sync group on the keepalived instance that remained master didn't
  receive a lower priority advert, and so didn't send further GARP
  This commit changes keepalived's behaviour, so that if a vrrp instance
  is sending GARP messages due to receiving a lower priority advert
  and it is a member of a sync group, keepalived will also send GARP
  messages for any other member of the sync group that have
  garp_lower_prio_rep set.
* Allow and default/default6 for rule/route to/from addresses.
* Check return value of SSL_CTX_new().
* Check return values of SSL_new() and BIO_new_socket().
* Only allow subnet masks with routes or virtual IP addresses.
  For example, if specifying a via address or preferred source address
  for a route, it isn't valid to specify a subnet mask.
* Add inet/inet6 to specify ip route/rule family if ambiguous.
* Remove superfluous parameter from parse_route().
* Add "any" and "all" as synonyms for "default".
* Fix memory leak if route destination address is wrong address family.
* Add ttl-propagate route option.
* Fix checking return status of kill().
* Fix building with --enable-debug configure option.
* Stop delay in reload when using network namespaces.
  If running in a network namespace, getaddrinfo() could take over
  30 seconds before timing out while trying to contact a name
  server. To alleviate this, the hostname is remembered from when
  keepalived started.
* Fix spelling of propagate in propagate_signal().
* Fix effective_priority after reload if tracked interface down.
* Cosmetic grammatical changes.
* Add debug option for dumping vrrp fd lists.
* Fix calculation for vrrp fd timers.
  Starting or reloading keepalived when an interface that was tracked
  interface was failed was stopping other vrrp instances that were on
  the same interface but not using VMACs coming up.
* Move code for initialising tracking priorities to vrrp_track.c.
* Don't overwrite track file on reload.
* Don't attempt to write track file if path not specified.
* Fix compiling when not using --enable-vrrp-fd-debug.
* Fix compiling with configure --enable-vrrp-fd-debug.
* Add sync group track_bfds and track file status to config dump.
* Move initialisation of track_files.
* Don't alter effective_priority if track_file take vrrp instance down.
* Don't log vrrp instance in fault state at reload if already fault.
* Fix calculating fd timer if all vrrp sands are set to TIMER_DISABLED.
* Don't make all sync groups transition to backup on reload
  If a sync group was in master state, and can still be after a reload
  then allow it to stay in master state.
* Don't have track_bfd list in vrrp_sgroup_t in BFD not enabled.
* Fix memory leak re vrrp_sgroup_t track lists.
* Tidy up some freeing of MALLOC'd memory.
  Use FREE_PTR if it is not known if the pointer is valid, and don't
  clear the pointer afterr FREE/FREE_PTR since FREE does it anyway.
* Add memory.c list size definition and move definition from memory.h.
* Increase size of checksum value for MEM_CHECK.
* Don't store checksum of memory allocation block. It can be calculated
  from the size, so do so.
* Make the checksum for memory allocation blocks unsigned.
* Use an enum for memory allocation block types.
* Update comment re debug bit for memory detect error.
* In memory alloc debug code report free or realloc for not alloc'd.
* Allow for PIDs up to 2^22 (7 decimal digits).
* Add function for dumping memory allocation while running.
* Fix max memory allocation size calculations.
* Fix reporting original and new file/line/func for realloc.
* Check matching block for realloc is allocated.
  The same memory block may have been previously allocated and freed,
  so we need to make sure that the block we find is currently marked
  as allocated.
* Use a new MEMCHECK struct for realloc overrun detected
  It was marking the allocated block as an overrun block, whereas it
  needs to be an allocated block, so use a new block to mark the
* Tidy up working of a couple of memory allocation messages.
* Use for loops rather than while blocks in memory allocation code.
* Report number of mallocs and reallocs with MEMCHECK.
* Attempt to log first free after double free in MEMCHECK.
* Streamline use of buf/buffer in memory.c.
* Always use first free entry in alloc_list for MEMCHECK.
* Define MEMCHECK alloc_list size via configure.
* Align keepalived_free() and keepalived_realloc().
* Make char * const where possible for MEMCHECK.
* Merge MEMCHECK keepalived_free() and keepalived_realloc().
  Most of the code was common between the two (or should have been),
  so it makes sense for them to use common code.
* Ensure only relevant thread types run during shutdown.
* Fix building without --enable-mem-check.
* Use rbtree search for finding child thread on child termination.
  It was doing a linear search of the rbtree in timeout order. This
  commit adds another rbtree for child processes (vrrp track scripts
  and check_misc scripts), sorted by PID, to make the search by PID
  more efficient.
* Make rbtree compare function thread_timer_cmp() more efficient.
* Remove child_remover functionality - it was superfluous.
* Fix checking that there are no duplicate vrrp instances configured
  The tuple {interface, family, vrid} must be unique. The check for
  this was being made completely incorrectly.
* Delay creating vrrp notify FIFO.
* Remove struct sockaddr_storage saddr from sock_t.
* Use an rbtree for finding vrrp instance for received advert.
  Previously the code search a list of pointers to vrrp instances and
  looked for a matching fd and vrid. In order to optimise this, it was
  implemented using an mlist whose index was a hash of the fd and vrid.
  This commit changes the approach and uses an rbtree for each sock_t.
  Since the sock_t that the advert was received on is known, the rbtree
  search is only searching for a match on the vrid.
  Not only is this more efficient, but it is simpler, uses standard code,
  and reduces the code by over 60 lines.
* Use an rbtree for finding vrrp instance for socket timeout.
  Previously the code search a list of pointers to vrrp instances and
  looked for matching file descriptor and sands < time_now. In order to
  optimise this, it was implemented using an mlist whose index was a hash
  of the fd.
  This commit changes the approach and uses a second rbtree for each sock_t.
  Since the sock_t that the timeout occurred on is known, the rbtree
  search is only searching for a match of the sands.
  and reduces the code by over 220 lines.
* Remove superfluous checks of rbtree node != NULL in rb_move().
* Remove superfluous check of node != NULL in rb_next().
* Update rbtree code to Linux 4.18.10.
* Fix debug logging of sands timers before time_now.
* Update rb_for_each_entry etc and rb_move to use rb_entry_safe.
  With the added definition of rb_entry_safe in the rbtree code
  updated to Linux 4.18.10, the refinition of rb_entry was reverted
  to the kernel definition. That meant that rb_for_each_entry,
  rb_for_eacn_entry_safe and rb_move neded to be updated to use
  rb_entry_safe rather than rb_entry.
* Add support functions for rbtree rb_root_cached.
  This is in preparation for the use of rb_root_cached in the next
* Use cached rbtrees where the key is a timeval_t sands
  When the key of an rbtree is a timeval_t sands keepalived will frequently
  need to access the first node of the tree in order to calculate the next
  timeout. This applies to the read, write, child and timer threads queues,
  and also the vrrp queues on a sock_t.
  The use of cached rbtrees for these is ideal since it gives direct access
  to the first node of the queue.
* Add thread_add_read_sands to avoid introducing timer errors.
  When using thread_add_read and the timeout was held as timeval_t,
  it was converted to and offset from time_now, and then converted
  back to a timeval_t, but time_now was updated, resulting in a
  slightly different value being used as the timeout. Using
  thread_add_read_sands() avoids the double conversion and results in the
  timeout being more accurate.
  It makes the code easier to read, and since NETLINK_TIMER was defined
  to be TIMER_NEVER it doesn't change the functionality.
* Handle preempt delays not expiring at same time on sync group
  If different vrrp instances in a sync group had preempt delays
  that expired at different times keepalived looped with very small
  to epoll_wait() until all preempt delays had expired, causing high
  CPU utilisation.
  Keepalived now reschedules vrrp instances with a delay of
  3 * advert_int + skew time while waiting for all vrrp instances in
  the sync group to expire their preempt delays.
* Fix segfault when receive netlink message for default route added.
* Move vrf_master_index into conditional compilation block.
* Store interface macvlan type.
* Make vrp_master_ifp point to self for VRF master interfaces.
* Log if cannot create a VMAC due to existing interface with same name.
* Handle delete/create of macvlan i/fs which aren't keepalived's.
* Tidying up keepalived_netlink.c.
* Handle VRFs changing on macvlan i/fs which have VMACs configured on them.
* Fix recreating our VMACs if they are deleted.
* Fix detecting address add/deletion from underlying i/f of our vmacs.
* Don't use configured_ifp or base_ifp if not _HAVE_VRRP_VMAC_.
* Distinguish between VMAC on real i/f and no VMAC on macvlan i/f
  If keepalived is configured to have a non VMAC interface on a macvlan
  interface, we want to use the macvlan interface rather than the
  underlying interface, whereas if we have a VMAC interface on a macvlan
  interface, we create the VMAC on the underlying interface of the macvlan.
* Update duplicate VRID check where vrrp instance configured on macvlan.
  If a VRRP instance is configured on a macvlan interface, the duplicate
  VRID check needs to be done on the underlying interface.
* Check for VRID conflicts when changeable interfaces are added
  For example, a vrrp instance could be configured on a macvlan, and
  that macvlan could be deleted and recreated with another base interface.
  The VRIDs in this case need to be checked for duplicates against the
  base interface, and so the VRID check needs to be done dynamically.
  In order to allow VRID conflicts to produce config errors at startup,
  by default keepalived assumes that there won't be interface movements
  as described above, and will only handle it if the global_defs option
  'dynamic_interfaces' is used along with the option 'allow_if_changes'.
* Remove some comments inserted for tracking changes to code.
* Fix building with --enable-debug configure option.
* Check that '{'s and '}'s are balanced in the configuration file.
* Allow more flexibility re placing of { and }.
* Improve reporting additional '}'s in configuration.
* Minor improvements re thread handling and cancellation.
* Remove unused THREAD_IF_UP and THREAD_IF_DOWN.
* Replace getpagesize() with sysconf(_SC_PAGESIZE).
* Increase netlink receive buffer for dumps to 16KiB.
* Dynamically set the netlink receive buffer size.
* Sort out setting netlink receive buffer size.
Release 2.0.7
* Fix buffer overflow in extract_status_code().
  Issue #960 identified that the buffer allocated for copying the
  HTTP status code could overflow if the http response was corrupted.
  This commit changes the way the status code is read, avoids copying
  data, and also ensures that the status code is three digits long,
  is non-negative and occurs on the first line of the response.
* Some fixes for config-test.
* Change ka_config_error() to report_config_error().
* Read interface addresses when doing config-test.
* Update documentation re garp_lower_prio_repeat.
* Add comment re tracking routes with nexthops doesn't work.
* Fix handling of default_interface
  Issue #963 identified that default_interface wasn't being set
  correctly. The problem was that the configuration was read by the
  parent process, but the parent process doesn't know about the
  system interfaces.
  Fix commit makes the vrrp process set the default interface when
  it starts.
* Fix a segfault in checker process on reload
  Issue #955 identified a segfault when keepalived reloads. This
  was caused by attempting to set the receive buffer size on a
  netlink socket that was not open. It now only attempts to set
  buffer sizes on the netlink sockets that are open.
* Use report_config_error() in check_parser.c.
* Don't run a sublevel close handler on a skipped configuration block
  If a configuration block was skipped due to an error, the configuration
  read won't be valid and may not even exist, so make sure the sublevel
  end handler isn't run.
  An example is if a virtual_server block is skipped, then the sublevel
  end handler would have run against the previous (if any) virtual_server,
  and if there hadn't been a previous virtual_server block it could
* Tidy up use of inet_stosockaddr.
* Add more error checking to read_timer() and its uses.
* Add validation of lvs_sched.
* Use report_config_error() in checker parsers
  Thwese should have been included in commit ead70947 -
  "Update config-test".
* Add stronger validation of numeric fields
  Issue #955 identified that invalid parameters in advert_int, delay_loop,
  lb_algo/lvs_sched, lb_kind/lvs_method, quorum, ip_family, virtual_server
  and real_server ports, weights and connect_timeout were not being reported.
  This commit will now report any errors in those fields, and a number of
  other fields.
* Improve parsing of virtual_router_id.
* Allow virtual server ports not to be specified
  If the service is persistent, a "wild-card" port can be used.
* Prepend WARNING to read_int/unsigned/double messages if not rejecting
  read_int()/read_unsigned()/read_double() can output log messages if
  the syntax is invalid but the configuration is being accepted, e.g.
  parsing 12zyx will return 12 if _STRICT_CONFIG_ is not defined. In
  this case we want to indicate that the entry is not valid, but we
  are still processing it, so prepend the error message with WARNING.
* Improve parsing of virtual server group address ranges
  An address range of was parsed as
  and no error was reported, although someone might have expected
  that this would mean
  keepalived will now report a configuration warning, and if
  keepalived is configured with --enable-strict-config-checks the
  configuration will be rejected.
* Restore original string in inet_stosockaddr()
  If there was a '-' or a '/' after the address, the string was modified
  to terminate at that point. This commit now restores the original string.
* Allow keepalived to run with --config-test when live instance running.
* Report errors for invalid smtp_server.
* Remove inet_stom() - it was not used
  inet_stom used atoi which is unsafe. Since the function was not used,
  it has been simply removed.
* Rename read_(int|unsigned|double) read_(int|unsigned|double)_strvec
  Want to be able to have equivalent functions just being passed a string,
  so rename the functions using strvec to be explicit about that.
* Fix config dump for vrrp_garp_lower_prio_delay.
* Fix config dump of vrrp garp_refresh.
* Make config dump write fraction part of vrrp preempt delay.
* Simplify config dump of garp/gna_interval.
* dd config dump for VRRP/checker/BFD realtime_priority/limit.
* Ensure structure fully initialised for sched_setscheduler.
* Make set_process_dont_swap() and set_process_priority() static functions.
* Minimise time when keepalived runs with realtime priority
  keepalived shouldn't use realtime priority when it is loading or
  reloading configurations, so delay setting realtime priorities, and
  revert to stardard scheduling when terminating or reloading.
* Report user/system CPU time used when exit with detailed logging.
* Make default rlimit_rtime 10000 microseconds
  The previous default of 1000 microseconds was insufficient
* Stop using atoi for readong configuration weight.
* Make read_unsigned, read_int, read_double for parsing strings
  These functions are analogous to read_unsigned_strvec, read_int_strvec
  and read_double_strvec, but take strings as the parameter rather than
  a strvec.
* Stop using atoi for parsing mask of ip addresses.
* Stop using atoi for reading VRID in Dbus code.
* Stop using atoi for reading vrrp debug level, and add to conf dump.
* Stop using atoi for parsing garp_refresh.
* Stop using atoi for parsing preempt_delay.
* Stop using atoi for parsing garp_lower_prio_repeat.
* Stop using atoi for parsing vrrp script rise.
* Stop using atoi for parsing vrrp script fall.
* Stop using atoi for parsing garp_interval/gna_interval
* Stop using atoi for parsing smtp status code
* Stop using atoi for parsing realtime scheduling priority
* Stop using atoi for parsing process priorities
* Stop using atoi for parsing global garp/gna_interval
* top using atoi for parsing genhash port number
* Stop using atoi for parsing tcp_server port number
* Stop using atoi for parsing command line log facility.
* update documentation to show range of bfd weights
* Ensure read_unsigned() detects negative numbers.
* Stop using atoi to parse HTTP_GET status code.
* Stop using atoi to parse checker port numbers.
* Use read_unsigned() for domain/inet_stosockaddr port.
* Make read_unsigned_strvec() recognise minus sign after spaces
  It is possible have a word read from the configuration start with
  spaces it is is enclosed in quotes, which are then removed, but
  the leading spaces aren't removed.
* Make get_u8()/get_u16()/get_u32() use read_unsigned().
* Make get_u64() properly detect -ve numbers.
* Make get_time_rtt() properly detect -ve numbers.
* Make get_addr64() handle whitespace properly and disallow '-' signs
  Skip leading whitespace, don't allow embedded whitespace, and don't
  allow minus signs.
* Make get_addr64() and parse_mpls_address handle whitespace
* Change more log_message() to report_config_error() in vrrp_iproute.c.
* Improve use of strtoul() in rttables.c.
* Implement get_u64() in same way as get_u8() etc.
* Fix print format specifier in read_unsigned_base
* Correct error message for garp_master_refresh
* Remove \n from error message.
* Allow round trip time to be UINT32_MAX
* Change mix_rx to min_rx for bfd_instance in documentation.
* Make bfd_parser use read_unsigned_strvec() etc rather than strtoul().
* Fix config dump for BFD instance timers.
* Fix handling of ip rule ipproto option.
* Add read_unsigned_base_strvec() to allow number base to be specified
  This requires renaming static functions read_int_int() etc to
  read_int_base() etc.
* Minimise and improve use of strtoul() etc in parsing ip rules.
* Use read_int_strvec() for vrrp_version.
* Use read_int_strvec() instead of strtol() in vrrp_parser.c.
* Use read_int_strvec() instead of strtol() etc in check_parser.c.
* Use read_int_strvec() instead of strtol() etc in check_data.c.
* Improve strtoul handling for '--log_facility' command line option.
* Add documentation for lvs_timeouts config option.
* Allow vrrp garp_delay to be 0 in accordance with documentation.
* Use read_int_strvec() instead of strtol() etc in global_parser.c.
* Corret end of line detection in genhash.
* Improve genhash command line parsing use of strtoul.
* Replace CHECKER_VALUE_INT with read_unsigned_strvec due to use of strtoul.
* Remove CHECKER_VALUE_UINT definition since no longer used.
* Add conditional compilation around variable not always used.
* Only read interfaces in VRRP process.
* Enable --config-test to work with BFD configuration.
* Only add garp_delay_t's to interfaces used by VRRP instances
  There is no point allocating a garp_delay_t to an interface that
  isn't used by a VRRP instance, so this commit make keepalived only
  allocate garp_delay_t scructures to the used interfaces.
  In addition, when the configuration is dumped, list the interfaces
  relevant to each garp_delay_t.
* Add logging command line options if keepalived segfaults.
* Don't free tcp checker data field on exit, since not used.
* Report configuration file line numbers when errors
  Following the recent series of commits for better validation of
  the configuration, and the move to reporting all configuration
  errors through report_config_error(), it is now feasible to report
  the configuration file line number on when the error occurs.
* Rationalise error messages when reading configuration
  Now that configuration file line numbers are reported, the error
  messages can be simplified since the context doesn't need to be
  given in the detail as before.
* Return NULL rather than false as a pointer in parser.c
* Fix an infinite loop when parsing certain parameter substitutions
  If a multiline definition had text after the '=' sign, keepalived
  would loop.
* Fix a multiline parameter substitution having a replacement on 1st line
  If a multiline parameter definition had a replaceable parameter or a
  definition on the first non-blank line, it wasn't being handled. This commit
  ensures that replaceable parameters/definitions on the first line are
  handled correctly.
* Add logging command line options when keepalived starts.
* Change some log_message() to report_config_error() in vrrp_sync.c.
* Improve handling of select() returning an error
  If select returned an error, the code was processing the returned
  timeout and fds as though they were valid. This commits logs an
  error the first time, sleeps for 1 second if it is a programming
  error, and then sets up the select call again.
* Remove DBG() statement left over in previous commit.
* improve doc spelling.
* Add mh scheduler for LVS
  This is similar to the sh scheduler. Options are the same but we
  duplicate everything. An alternative would have been to reuse the
  names for the sh scheduler.
  The mh scheduler is supported starting from Linux 4.18. It's a
  consistent hash scheduler.
* manpage update and re-visited.
  keepalived.conf.5 be considered as THE exhaustive source of information
  in order to configure Keepalived. This documenation is supported and
  maintained by Keepalived Core-Team.
* Fix errors in KEEPALIVED-MIB.txt
  Commit 181858d - "Add mh scheduler for LVS" introduced a couple
  of formatting errors, and didn't update the revision date.
* Some SNMP library handling improvements.
* Stop bfd -> vrrp pipe read timing out
  There is no need for a timeout on reading the pipe, so set the
  timeout to TIMER_NEVER.
* manpage updates
  Update manpage to make html convertion easy. This manpage is now
  sitting in documentation tab of Keepalived website.
* Update libnl_link.c
  SegFault when launch with dynamic LIBNL because of loading symbol
  from wrong library.
* Fix building rpm package and instructions
  Issue #977 identified that the instructions in the INSTALL file
  were incorrect.
* Adds regex pattern matching for HTTP_GET and SSL_GET.
* Remove pcre build tests from Travis-CI
  Travis-CI environments are too old to support libpcre2, so we have
  to remove it.
* Fix #980: coredump on start when logfile cannot be accessed.
* Don't loop forever if configuration has unknown replaceable parameter.
Release 2.0.6
* Fix genhash digest calculation. The bracketting in HASH_UPDATE was wrong.
* Bring keepalived(8) man page up to date.
* Fix segfault when IPVS_DEST_ATTR_ADDR_FAMILY not defined.
  Issue #938 identified a segfault on the checker process when using
  CentOS/RHEL 6. It turned out that conditional compilation check
  for IPVS_DEST_ATTR_ADDR_FAMILY was not being handled correctly.
* Don't create a link-local address for vmac when vmac_xmit_base is set
  Since commit 18ec95add483 ("Make vmac_xmit_base work for IPv6
  instances") VRRP advertisements are sent from the base interface and not
  from the vmac interface when vmac_xmit_base is set.
  Therefore, there is no need to configure a link-local address on the
  vmac interface. This also means that we don't need to regenerate a
  link-local address for the vmac if the link-local address was removed
  from the base interface, or inherit a link-local address in case one was
  configured on the base interface.
* Fix setting i/f params on a bridge underlying i/f of a VMAC
  Issue #944 identified that when the underlying interface of a VMAC
  interface was a bridge, keepalived was failing to set arp_ignore and
  arp_filter in the underlying bridge interface. The problem appears to
  lie in the libnl3 library. The description of the problem given in the
  issue report was:
    Problem is that ifi_family is set to AF_BRIDGE, whereas it should be set
    to AF_UNSPEC. The kernel function that handles RTM_SETLINK messages for
  AF_BRIDGE doesn't know how to process the IFLA_AF_SPEC attribute.
  This commit stops using libnl3 for setting/clearing arp_ignore and
  arp_filter, and directly constructs the netlink messages in keepalived.
* Use RTM_NEWLINK rather than RTM_SETLINK for setting i/f options
  libnl3 uses RTM_NEWLINK rather than RTM_SETLINK for setting
  interface options when ifi_family is AF_UNSPEC, so update commit
  9b2b2c9 - "Fix setting i/f params on a bridge underlying i/f of
  a VMAC" to do likewise.
* Fix creating VMACs on 2.6.32 and earlier kernels
  RTM_NEWLINK didn't support specifying interface by name until
  Linux 2.6.33, and if using an earlier kernel, the netlink call
  failed. This meant that the VMAC was not enabled.
* Fix setting arp_ignore and arp_filter on bridge interfaces.
* Add diagnostic message if vrrp script time out and kill fails.
* Fix compile errors and warnings when building with --enable-debug.
* Don't do md5 check unless configured.
* In http_handle_response() combine fetched_url and url
  fetched_url and url always pointed to the same url, so only use
  one variable.
* Store and handle HTTP_GET digest in binary form
  Configured digests were being stored in character string form, and
  the calculated digests were converted to strings. This commit now
  handles digests as fixed length binary data, and validates the
  configured digests to make sure they are valid hex strings with
  the correct length.
* Add support for quote and escape handling of notify and other scripts.
  Notify and other scripts need to be able to be configured with embedded
  spaces, quotes and special characters for the command and the parameters.
  This commit adds that ability.
* When checking script file path, only replace name part if same file.
  Some executables are in the filesystem as symbolic links, and alter
  their functionality based on the file part of the name. This was being
  incorrectly handled by keepalived, which now checks whether a file exists
  using the original name, and it it does whether it is the same file.
* Remove cmd_str from notify_script_t
  The cmd_str string (sort of) duplicated what was in the args array
  of a notify_script_t, but was not always accurate. With the removal
  of cmd_str, whenever it needs to be output, the string is now
  generated from the args array, so accurately reflects what is
  actually executed.
* Add quoting and escaping for script configuration, and other minor changes.
* Use vsyslog() if available instead of syslog().
* Report virtual server as well as real server when config dump checker.
* Only report IP_MULTICAST_ALL unset for IPv4 sockets
  Commit 6fb5980 - "Stop receive message queues not being read on send
  sockets" added a warning if data was received on vrrp send sockets, since
  setting IP_MULTICAST_ALL should stop packets being received, but older
  kernels still queued packets.
  It has now been discovered the IP_MULTICAST_ALL (of course) only applies
  to IPv4 and so the warning only makes sense for IPv4 sockets.
  I haven't been able to find a way to stop IPv6 multicast packets being
  received on the send socket. It appears that if any socket adds an IPv6
  multicast group on an interface, then any raw socket using that interface
  will recieve all enabled multicast packets, and the receive socket has to
  add the multicast group.
* Properly stop packets being queued on vrrp send sockets
  Commit 6fb5980 - "Stop receive message queues not being read on
  send sockets" did stop messages building up on the receive queue
  of vrrp send sockets, but it wasn't an ideal solution, and it also
  made the assumption that the problem was only occurring due to
  multicast packets not being filtered when IP_MULTICAST_ALL was set,
  which appears not to work properly between at least Linux 3.6.11 and
  3.16. In fact the problem also occurred when using IPv4 unicast and
  IPv6 in any form, and so has been a long term issue in keepalived.
  The original solution was to listen on the send socket and discard any
  packets that were received. This commit takes a completely different
  solution (many thanks to Simon Kirby for the suggestion) and sets a
  BPF filter on send sockets that filter out all received packets on the
  This commit effectively reverts commit 6fb5980, and the subsequent
  commits 88c698d8 - "Cancel read thread on send sockets when closing",
  f981b55d - "Only allow vrrp_rx_bufs_policy NO_SEND_RX if have
  IP_MULTICAST_ALL", 7ff7ea1f - "Another fix to listening on send socket",
  and 77d947f7 - "Only report IP_MULTICAST_ALL unset for IPv4 sockets"
  and partially reverts 4297f0a - "Add options to set vrrp socket receive
  buffer sizes".
  This commit removes the configuration option NO_SEND_RX from
  vrrp_tx_bufs_policy introduced in commit 4297f0a since it is now
  no longer relevant, because no packets are queued to the send socket.
* Add newlines to the keepalived.stats output for better readability.
* Add notify_master_rx_lower_pri script option and FIFO output.
  If a lower priority router has transitioned to master, there has presumably
  been an intermittent communications break between the master and backup. It
  appears that servers in an Amazon AWS environment can experience this.
  The problem then occurs if a notify_master script is executed on the backup
  that has just transitioned to master and the script executes something like
  a `aws ec2 assign-private-ip-addresses` command, thereby removing the address
  from the 'proper' master. Executing notify_master_rx_lower_pri notification
  allows the 'proper' master to recover the secondary addresses.
* Fix malloc'd memory length in open_log_file().
Release 2.0.5
* Update config-test option so keepalived exits with status 1 on failure.
* Fix config write of virtual server group ip addresses.
* Document default and default6 for virtual/static route destinations.
* Cancel read thread on send sockets when closing.
  Commit 4297f0a - "Add options to set vrrp socket receive buffer sizes"
  added reading on vrrp send sockets to stop receive queues building up
  on some 3.x kernels. The commit didn't cancel the read thread on the
  send sockets when the socket was closed, causing several thousand
  log writes. This commit cancels the read thread.
* Exit with status 1 if config check fails, and fix terminating when
  reading send sockets.
* Stop segfaulting when receive a packet (fixing commit 97aec76).
  Commit 97aec76 - "Update config-test option so keepalived exits
  with status 1 on failure" had a test for __test_bit(CONFIG_TEST_BIT)
  the wrong way round. This commit fixes that.
* Don't assume rpm is available.
* Only allow vrrp_rx_bufs_policy NO_SEND_RX if have IP_MULTICAST_ALL.
* Improve setting up virtual/real servers with virtual server groups.
  When setting up virtual servers defined by virtual server groups,
  keepalived was getting confused between fwmarks and ip addresses.
  This still needs further work, but the setting up of virtual/real
  servers now works.
* Fix setting up and deletion of virtual servers with groups
  Virtual server entries in virtual server groups can be used
  by multiple virtual_server entries. This commit ensures that
  virtual servers are not deleted until the last virtual_server
  instance using the virtual server is removed.
* Allocate vrrp send buffer during vrrp_complete_instance()
  Issue #926 identified a segfault. The vrrp send buffer was not being
  allocated early enough, and was being accessed before being allocated
  if the checksum algorithm needed updating.
* Fix vrrp v3 with unicast and IPv4.
  The checksum calculations were happening in the wrong way, with the
  wrong data. This commit sorts all that out.
* Don't set effective priority to 254 when specify dont_track_primary.
* Make csum_incremental_update16/32 inline.
* Add --enable-optimise=LEVEL configure option.
* Remove debug message left in from adding --enable-optimise.
* Fix compiling on CentOS 6.
  Issue #932 identified that keepalived would not compile on CentOS 6.
  The problem is that kernel header file linux/rtnetlink.h needs
  sys/socket.h to be included before linux/rtnetlink.h when using old
  (e.g. 2.6) kernel headers.
* Another fix to listening on send socket.
  added reading on vrrp send sockets to stop receive queues building up
  on some 3.x kernels. The commit didn't save the new thread in
  sock->thread_out when it was added for reading in vrrp_write_fd_read_thread.
  It now does so.
Release 2.0.4
* Make vmac_xmit_base work for IPv6 instances.
  Issue #917 identified that for IPv6 even when vmac_xmit_base was
  configured, the adverts were being sent from the vmac interface.
  This commit makes the packets be sent from the underlying interface
  when vmac_xmit_base is configured.
* Handle vmac_xmit_base when interfaces are recreated.
* Add -t config-test option.
  Issue #389 has received increasing support to add a configuration
  validation option. This commit adds the -t/--commit-test option
  to report any detected configururation errors and exit.
  Errors are logged to the system log by default, but use of the -g
  and -G options can make the errors be logged to files.
Release 2.0.3
* Fix building with --disables-routes configure option.
* Fix some compiler warnings on Travis-CI.
* Fix setting vrrp effective priority on reload.
* Add tracking of static addresses, routes and rules
  By default a static address, route or rule will now be reinstated
  if it is deleted, unless the no_track option is specified.
  In addition, if a track_group is specified for an address/route/rule
  then if the address/route/rule cannot be reinstated (e.g. if the
  specified interface is down or has been deleted), then the vrrp
  instances specified in the track group will transition to fault state
  until the interface comes back up.
  This commit completes the monitoring and reinstatement of addresses
  routes and rules and means that keepalived should now fully support
  hot-swap devices.
* Log when restoring static addresses, routes or rules.
* Allow static addresses/routes/rules to be configured on VMACs.
  When VMACs were using an interface name generated by keepalived,
  if static address/routes/rules had beeon configured on a VMAC
  interface name, then a different name would be generated for
  the vrrp instance. This commit now allows the same name to be used.
* Fix configure when pkg-config --libs returns -L entries.
* Add log message for advert receive timeout when using log detail (-D).
* Stop receive message queues not being read on send sockets.
  We shouldn't receive anything on vrrp send sockets since IP_MULTICAST_ALL is
  cleared, and no multicast groups are subscribed to on the socket. However,
  Debian Jessie with a 3.16.0 kernel, CentOS 7 with a 3.10.0 kernel,
  and Fedora 16 with a 3.6.11 kernel all exhibit the problem of multicast
  packets being queued on the send socket. Whether this was a kernel problem
  that has been subsequently resolved, or a system default configuration
  problem isn't yet known.
  The workaround to the problem is to read on the send sockets, and to discard
  any received data.
  If anyone can provide more information about this issue it would be
  very helpful.
* Ensure sorry server/virtual server same address family unless tunnelled.
  A real server and a virtual server can only be of the same address family
  if the forwarding method is tunnelled, and also must have a kernel that
* Add options to set vrrp socket receive buffer sizes.
  Some systems have very large settings for net.core.rmem_default
  allowing very large receive queues to build if the sockets aren't
  read. keepalived doesn't need large buffers for receive queues,
  so this commit allows options for setting the maximum buffer sizes
  to be much smaller. It also adds the option of setting the receive
  buffer size on the vrrp send sockets to be as small as possible,
  since we shouldn't be receiving anything on those.
  Following commit 6fb5980 - "Stop receive message queues not being
  read on send sockets", this commit also adds the option not to
  read the send sockets, which can be used where it is known that the
  kernel will not queue unwanted multicasts to the send socket.
* Consider eVIPs when determining if need GARP/NDISC send buffers.
* Fix sending IPv6 unicast vrrp adverts.
Release 2.0.2
* Only compile code in rttables.c that is needed by the
* Set default preferences for ip rules if not specified.
  Since different vrrp instances can become master in different
  orders, if preferences (priorities) are not specified for
  ip rules, the order in which they are specified will be
  indeterminate. In order to give some consistency, keepalived
  will not allocate a default preference to each rule, and will
  also warn that this is probably not going to work as intended.
  The solution is to specify a preference for each rule.
* Require preference if an ip rule specifies goto.
  Since preferences are now auto-generated if not specified, a
  rule with a goto must now specify a preference.
* Add tracking of virtual rules.
  If a virtual rule is deleted, the vrrp instance will transition
  to backup. When it becomes master again the rule will be re-added.
* Fix compilation failure found by Travis-CI.
* In check if SHA1_Init() needs -fpic.
* Fix make rpm when rpmbuild doesn't support --build-in-place.
* Update INSTALL file to describe how to build rpm files.
* Fix instructions for building rpm packages.
Release 2.0.1
* Remove '\n' characters from log_message() text.
* Allow IPv6 ip rules to be specified using fwmarks.
* Fix configure generation of keepalived.spec file.
* Stop rebuilding scheduler.o every make.
* Remove ' characters from configure args in keepalived -v output.
* Remove duplicate reporting of network namespace in config dumps
* Add ${_INSTANCE} config parameter.
* Remove debugging log message.
* Recalculate max_fd used for select if it should reduce.
* Add tracking of virtual routes.
  If a virtual route is deleted, by default to vrrp instance will
  now transition to backup mode, and if it transitions to master
  again the route will be re-added. If an interface on which a
  route is configured is down, then the instance will go to fault
  state, since the route cannot be added.
  This commit also adds a no-track option for routes, which means
  that deletion of the route will not cause the vrrp instance to
  transition to backup.
* Handle interface down at startup with tracked route configured on it
  If a virtual route which is tracked is configured on an interface that
  is down at startup, then the vrrp instance needs to start in fault
* Rename netlink_reflect_filter() to netlink_link_filter()
  The function only handles RTM_NEWLINK/RTM_DELLINK messages and there
  are other functions to handle other message types.
* Fix compilation warning.
* Make recreating deleted VMACs work.
* Fix Travis-CI compilation failure and warning.
* Stop duplicate definition and duplicate include in vrrp_iproute.c.
* Add new ip rule options for Linux 4.17
  been added in Linux 4.17.
Release 2.0.0
* Beta branch merge into master branch ! 2years of dev here !
* Transition to master as soon as decision is made to do so
    Previously keepalived waited one further advert interval before
    This meant that previously if a master went down and sent priority
    0 message, there was one extra advert interval before the highest
    priority backup configured the VIP addresses.
    Now if vrrp instances have high priorities (i.e. close to 255),
    then the transition to master and configuration of addresses will
    now occur in a small multiple of advert_interval/256.
* Process interface state changes immediately.
    Previously keepalived waited for advert timer expiry. The problem
    was that if an interface went down and came back up before the
    next timer expiry, and addresses, routes and VMACs that we had
    configured on that interface would be removed, but we wouldn't
    know about it.
* Add support for hot-swappable NICs
    This also handles interfaces being deleted and restored.
* Add vrrp_track_file option.
    This allows track_scripts, which are run on a frequent scheduled
    basis, to be replaced with a vrrp_track_file, which contains a
    number as a text string which is used in the same way as the exit
    status from a track script. The track_files are only read if they
    are changed, so external events can update a track file, rather
    than their status needing to be detected by polling by track
* Add notify fifos.
    Rather than sending notifications via notify scripts it is now
    possible to send notify messages via fifos. Not only does this
    mean that the overhead of executing script for each notification
    is removed, but it also guarantees the delivery of notifications
    in the correct order, whereas if the notification is via scripts,
    there is no guarantee that the scripts will execute in the desired
    order if two or more notifications are sent in quick succession.
    There can be a global fifo to process all notifies, and also
    separate fifos for vrrp and checkers. It is possible to specify a
    script for keepalived to execute to process the messages on the
* Stop logging address addition/deletions if addresses not ours
    The -a option can be used to override this behaviour and log all
    address changes.
* Transition to fault state if source address for adverts is deleted
   from interface
* Transition to backup state if a VIP or eVIP is removed
    When we next transition to master the addresses will be restored.
    If nopreempt is not set, that will be almost immediately.
* Make address owner (priority 255) transition to master immediately
* Don't process a received advert if the authentication fails
* Ignore invalid received adverts totally
    Previously the master down timer was being updated, which meant
    that a backup could be stuck in backup state even if the only
    received adverts were invalid.
* Don't reset timer before sending next advert if receive a lower
  priority advert.
    This was stopping a higher priority backup instance to stay in
    backup state.
* Log if receive invalid authentication header
* Ignore lower priority adverts when backup (to comply with RFCs)
    This also means that the master down timer wasn't reset, which
    was causing a delay to becoming master
* Fix first advert interval of vrrp instances in a sync group.
* Stop two vrrp instances with preempt delay and equal priorities
  flip-flopping between master and backup state
* Make sync group members transition state at same time
    When first instance makes transition (i.e. when the trigger event
    occurs) rather than wait for next timer expiry
* Process vrrp track script returning a new status code immediately
    For all instances (and their sync group members), rather than
    waiting for the next timer expiry on each instance, the instance
    will transition update it's state immediately.
* On reload, make track scripts inherit the state from before reload
    This stops vrrp instances transitioning to down and coming back up
    once the script has run.
* Correct the use of adver_int and master_adver_int
* Ensure when leaving fault state that a vrrp instance transitions
  to backup unless it has priority 255
* Remove quick_sync functionality since no longer needed.
* Improved code efficiency:
  * Finding vrrp instance after read timeout
  * When getting interface information for a new vmac, only request
     information for that i/f.
  * Directly update effective priority of vrrp instances when scripts
     return new status rather than scheduling a thread to do it
  * Don't run a read timeout on vrrp instance in fault state
  * Don't run a track script if no vrrp instance is tracking it
  * Stop checking interface status after every timer expiry since
     processing interface state changes is now done synchronously
  * The timeout for the select call had a maximum timeout of 1 second,
     it now times out only when something needs to happen
  * The timeout on netlink reads was 500 seconds and this has been
     extended to 1 day.
  * Streamline signal handling between main process and child process
     by using signalfd if available, rather than using a pipe
  * Minimise searching for an interface struct based on its index by
     using pointers to the interface structures
  * Stop opening and closing vrrp scripts before running them. We can
     detect they are missing from the return of the exec call.
  * Allow threads that don't need a timeout to never timeout
  * Calculate the maximum fd number when calling select() rather than
     specifying the maximum of 1024.
  * Ignore netlink NEWLINK messages that are only wireless state
  * Don't check whether timers have expired after select() returns if
     its timeout didn't expire.
  * Termination of child processes (scripts) were being handled twice
  * Don't generate the IP header checksum since the kernel will always
     generate it.
  * Maintain pointers to tracking scripts to save seaching a list to
     find the relevant script.
  * Vrrp instances to have pointer to interface structure to avoid
      having to search based in index
* Fix the checksum calculation for VRRPv3 unicast peers.
* Don't regenerate the full advert packet each time an advert is sent
    Keepalived now simply updates the necessary fields and calculates
    the change needed to the checksum.
* Detect a vmac interface going down, and make the vrrp instance
  transition to fault state.
    Previously the instance would only go down if the underlying
    interface went down.
* Stop weighted track scripts updating priority of sync group members
* Make vrrp instances go straight to fault state at startup if a
  relevant interface is down
    Previously an instance would start in up state and transition to
    fault at next timer expiry
* Ensure that a sync group starts in backup state unless all members
  are address owners
* Restore master down timer after leaving fault state
* Use execve() to execute scripts rather than system().
    This saves a fork and an extra process, and also allows the
    parameters to be parsed once only at startup, rather than each
    time the script is invoked.
* Don't treat a failure to execute a script as a failure of the script
* Ensure all scripts receive TERM signal when keepalived terminates
* If keepalived is running with an elevated priority, stop running
  scripts with that elevated priority.
* Enable an unweighted tracking script make a vrrp instance which is
  an address owner transition to fault state
* Delay bringing vrrp instances up at startup until after the first
  completion of the tracking scripts
    This stops an instance coming up an then being brought back down
    again after the script completes with a failure.
* Reduce number of error messages if a script is not executable
* Add linkbeat option per vrrp instance
* Fix timer addition on 32-bit systems
* Ignore netlink messages for interfaces using linkbeat polling
* If priority of vrrp instance changes when in backup due to a vrrp
  script, reschedule the read timeout
* If re-using a VMAC after a reload, ensure it is correctly configured
* Don't send priority 0 adverts when transition to fault state unless
  were in master mode
* Identify routes added by keepalived as belonging to keepalived
* Enable vrrp instances to be put into fault state if their routes are
* Add track scripts, track files and track_if to sync groups and
  deprecate global_tracking
    (use sync_group_tracking_weight instead, but only if necessary).
* Improve AH authentication sequence number handling, and (re)enable
  sequence number checking for VMACs and sync groups
* Remove autoconf/automake generated files from git repo.
    Script build_setup will create the necessary build environment.
* Improve and standardise notifications
* Fix not sending RS and VS notifies if omega set
* Add no_checker_emails to not send emails every time a checker
    changes state, but only if a real server changes state
* Monitor VIP/eVIP deletion and transition to backup if a VIP/eVIP
    is removed unloes it is configured with the no-track option.
Release 1.4.5
* Update snapcraft.yaml for 1.4.x+git
* Fix generation of git-commit.h with git commit number.
* Set virtual server address family correctly.
* Set virtual server address family correctly when using tunnelled
  real servers.
* Fix handling of virtual servers with no real servers at config time.
* Add warning if virtual and real servers are different address families.
  Although normally the virtual server and real servers must have the
  same address family, if a real server is tunnelled, the address families
  can be different. However, the kernel didn't support that until 3.18,
  so add a check that the address families are the same if different
  address families are not supported by the kernel.
* Send correct status in Dbus VrrpStatusChange notification.
  When an instance transitioned from BACKUP to FAULT, the Dbus
  status change message reported the old status (BACKUP) rather than
  the new status (FAULT). This commit attempts to resolved that.
Release 1.4.4
* doc: ipvs schedulers update
* Fix a couple of typos in
* Fix namespace collision with musl if_ether.h.
* Check if return value from read_value_block() is null before using.
* Fix reporting real server stats via SNMP.
* Make checker process handle RTM_NEWLINK messages with -a option
  Even though the checker process doesn't subscribe to RTNLGRP_LINK
  messages, it appears that older kernels (certainly 2.6.32) can
  send RTM_NEWLINK (but not RTM_DELLINK) messages. This occurs
  when the link is set to up state.
  Only the VRRP process is interested in link messages, and so the
  checker process doesn't do the necessary initialisation to be able
  to handle RTM_NEWLINK messages.
  This commit makes the checker process simply discard RTM_NEWLINK
  and RTM_DELLINK messages, rather than assuming that if it receives
  an RTM_NEWLINK message it must be the VRRP process.
  This problem was reported in issue #848 since the checker process
  was segfaulting when a new interface was added when the -a command
  line option was specified.
* Fix handling RTM_NEWLINK when building without VRRP code.
* Fix building on Fedora 28.
  net-snmp-config output can include compiler and linker flags that
  refer to spec files that were used to build net-snmp but may not
  exist on the system building keepalived. That would cause the build
  done by configure to test for net-snmp support to fail; in particular
  on a Fedora 28 system that doesn't have the redhat-rpm-config package
  This commit checks that any spec files in the compiler and linker
  flags returned by net-snmp-config exist on the system building
  keepalived, and if not it removes the reference(s) to the spec file(s).
Release 1.4.3
* vrrp: setting '0' as default value for ifa_flags to make gcc happy.
* Add additional libraries when testing for presence of SSL_CTX_new().
  It appears that some systems need -lcrypto when linking with -lssl.
* Sanitise checking of libnl3 in
* Report and handle missing '}'s in config files.
* Add missing '\n' in output. 
* Stop backup taking over as master while master reloads.
  If a reload was initiated just before an advert, and since it took 
  one advert interval after a reload before an advert was sent, if the
  reload itself took more than one advert interval, the backup could
  time out and take over as master. 
  This commit makes keepalived send adverts for all instances that are
  master immediately before a reload, and also sends adverts immediately
  after a reload, thereby trippling the time available for the reload
  to complete.
* Add route option fastopen_no_cookie and rule option l3mdev. 
* Fix errors in KEEPALIVED-MIB.txt.
* Simplify setting on IN6_ADDR_GEN_MODE.
* Cosmetic changes to keepalived(8) man page.
* Don't set ipvs sync daemon to master state before becoming master
  If a vrrp instance which was the one specified for the ipvs sync
  daemon was configured with initial state master, the sync daemon
  was being set to master mode before the vrrp instance transitioned
  to master mode. This caused an error message when the vrrp instance
  transitioned to master and attempted to make the sync daemon go from 
  backup to master mode.
  This commit stops setting the sync daemon to master mode at initialisation
  time, and it is set to master mode when the vrrp instance transitions
  to master. 
* Fix freeing vector which has not had any entries allocated.
* Add additional mem-check disgnostics
  vector_alloc, vectot_alloc_slot, vector_free and alloc_strvec all
  call MALLOC/FREE but the functions written in the mem_check log
  are vector_alloc etc, not the functions that call them.
  This commit adds logging of the originating calling function.
* Fix memory leak in parser.c.
* Improve alignment of new mem-check logging.
* Disable all checkers on a virtual server when ha_suspend set.
  Only the first checker was being disabled; this commit now disables
  all of them.
  Also, make the decision to disable a checker when starting/reloading
  when scheduling the checker, so that the existance of the required
  address can be checked.
* Stop genhash segfaulting when built with --enable-mem-check.
* Fix memory allocation problems in genhash.
* Properly fix memory allocation problems in genhash.
* Fix persistence_granularity IPv4 netmask validation.
  The logic test from inet_aton() appears to be inverted.
* Fix segfault when checker configuration is missing expected parameter
  Issue #806 mentioned as an aside that "nb_get_retry" without a parameter
  was sigfaulting. Commit be7ae80 - "Stop segfaulting when configuration
  keyword is missing its parameter" missed the "hidden" uses of vector_slot()
  (i.e. those used via definitions in header files). 
  This commit now updates those uses of vector_slot() to use strvec_slot()
* Fix compiling on Linux 2.x kernels.
  There were missing checks for HAVE_DECL_CLONE_NEWNET causing 
  references to an undeclared variable if CLONE_NEWNET wasn't defined.
* Improve parsing of kernel release.
  The kernel EXTRAVERSION can start with any character (although
  starting with a digit would be daft), so relax the check for it
  starting with a '-'. Kernels using both '+' and '.' being the
  first character of EXTRAVERSION have been reported.
* Improve grammer.
* add support for SNI in SSL_GET check.
  this adds a `enable_sni` parameter to SSL_GET, making sure the check
  passes the virtualhost in the SNI extension during SSL handshake.
* Optimise setting host name for SSL_GET requests with SNI.
* Allow SNI to be used with SSL_GET with OpenSSL v1.0.0 and LibreSSL.
* Use configure to check for SSL_set_tlsext_host_name()
  Rather than checking for a specific version of the OpenSSL library 
  (and it would also need checking the version of the LibreSSL library)
  let configure check for the presence of SSL_set_tlsext_host_name().
  Also omit all code related to SNI of SSL_set_tlsext_host_name() is
  not available.
* Use configure to determine available OpenSSL functionality
  Rather than using version numbers of the OpenSSL library to determine
  what functions are available, let configure determine whether the
  functions are supported.
  The also means that the same tests work for LibreSSL.
* Add support for gratuitous ARPs for IP over Infiniband.
* Use system header definition instead of local definition IF_HWADDR_MAX
  linux/netdevice.h has definition MAX_ADDR_LEN, which is 32, whereas 
  IF_HWADDR_MAX was locally defined to be 20.
  Unfortunately we end up with more system header file juggling to ensure
  we don't have duplicate definitions.
* Fix vrrp_script and check_misc scripts of type </dev/tcp/
* Add the first pre-defined config definition (${_PWD})
  ${_PWD} in a configuration file will be replaced with the full
  path name of the directory that keepalived is reading the current 
  configuration file from.
* Open and run the notify fifo and script if no other fifo
  Due to the way the code was structured the notify_fifo for both
  checker and vrrp messages wasn't run if neither the vrrp or checker 
  fifo wasn't configured.
  Also, if all three fifos were configured, the general fifo script
  was executed by both the vrrp and checker process, causing problems.
* Add support for Infiniband interfaces when dumping configuration.
* Tidy up layout in vrrp_arp.c.
* Add configure check for support of position independant executables (PIE).
* Add check for -pie support, and fix writing to
Release 1.4.2
* Make genhash exit with exit code 1 on error.
  Issue #766 identified that genhash always exits with exit code 1
  even if an error has occurred.
* Rationalise printing of http header in genhash.
* Use http header Content-Length field in HTTP_CHECK/SSL_CHECK.
  If a Content-Length is supplied in the http header, use that as a
  limit to the data length (as wget does). If the length of data 
  received does not match the Content-Length log a warning.
* Optimise parameter passing to fprintf in genhash.
* Don't declare mark variable if don't have MARK socket option. 
* Fix sync groups with only one member. 
  Commit c88744a0 allowed sync groups with only 1 member again, but
  didn't stop removing the sync group if there was only 1 member. 
  This commit now doesn't remove sync groups with only one member. 
* Make track scripts work with --enable-debug config option. 
* Add warning if --enable-debug configure option is used.
* Allow more flexibility of layout of { and } in config files.
  keepalived was a bit fussy about where '{'s and '}'s (braces) could
  be placed in terms of after the keyword, or on a line on their own.
  It certainly was not possible to have multiple braces on one line.
  This commit now provides complete flexibility of where braces are, so 
  long as they occur in the correct order.
* Make alloc_value_block() report block type if there is an error.
* Simplify alloc_value_block() by using libc string functions.
* Add dumping of garp delay config when using -d option. 
* Fix fractions of seconds for garp group garp_interval.
* Make read_value_block() use alloc_value_block().
  This removes quite a bit of duplication of functionality, and
  ensures the configuration parsing will be more consistent.
* Fix build with Linux kernel headers v4.15.
  Linux kernel version 4.15 changed the libc/kernel headers suppression
  logic in a way that introduces collisions.
* Add missing command line options to keepalived(8) man page.
* Fix --dont-release-vrrp.
  On github, ushuz reported that commit 62e8455 - "Don't delete vmac
  interfaces before dropping multicast membership" broke --dont-release-vrrp.
  This commit restores the correct functionality.
* Define _GNU_SOURCE for all compilation units.
  Rather than defining _GNU_SOURCE when needed, let configure add
  it to the flags passed to the C compiler, so that it is defined 
  for all compilation units. This ensures consistence.
* Fix new warnings procuded by gcc 8.
* Fix dumping empty lists.
  Add a check in dump_list() for an empty list, and don't attempt 
  to dump it if it is empty.
* Resolve conversion-check compiler warnings.
* Add missing content to installing_keepalived.rst documentation.
  Issue #778 identified that there was text missing at the end of
  the document, and that is now added.
* Fix systemd service to start after
  This fix was merged downstream by RedHat in response to
  RHBZ #1413320.
* Update INSTALL file to describe packages needed for building
* INSTALL: note linux distro package that provides 'sphinx_rtd_theme'
* Clear /proc/sys/net/ipv6/conf/IF/disable_ipv6 when create VMACs.
  An issue was identified where keepalived was reporting permission
  denied when attempting to add an IPv6 address to a VMAC interface.
  It turned out that this was because 
  was set to 1, causing IPv6 to be disables on all interfaces that
  keepalived created.
  This commit clears disable_ipv6 on any VMAC interfaces that
  keepalived creates if the vrrp instance is using IPv6.
Release 1.4.1
* Improve and fix use of getopt_long().
  We musn't use a long option val of 1, since getopt_long() can return
  that value.
  getopt_long() also returns longindex == 0 when there is no matching
  long option, and there needs to be careful checking if there is an
  error to work out whether a long or short option was used, which is
  needed for meaningful error messages.
* Write assert() messages to syslog.
  assert()s are nasty things, but at least let's get the benefit of
  them, and write the messages to syslog, rather than losing them down
* Enable sorry server at startup if quorum down due to alpha mode
  If alpha mode is configured on sufficient checkers so that a
  virtual server doesn't have a quorum, we need to add the sorry
  server at startup, otherwise it won't be added until a quorum has
  been achieved and subsequently lost again. In the case where some
  of the checkers remain in the down state at startup, this would have
  meant that the sorry server never got added.
* For virtual servers, ensure quorum <= number of real servers
  If the quorum were gigher than the number of real servers, the
  quorum for the real server to come up could never be achieved, so
  if the quorum is greater than the number of real servers, reduce it
  to the number of real servers.
* Fix some SNMP keepalived checker integer types and default values.
  Some virtual server and real server values were being sent to SNMP
  with a signed type whereas the value is unsigned, so set the type
  field correctly.
  Some virtual server and real server values that apply to checkers
  are set to nonsense default values in order to determine if a
  value has been specified. Handle these values when reporting them
  to SNMP replying with 0 rather than a nonsense value.
* Fix some MALLOC/FREE issues with notify FIFOs.
*  Add instance_name/config_id to alert emails' subjects if configured.
  If multiple instances of keepalived are running, either different
  instance_names and/or config_ids, it is useful to know which
  keepalived instance the email relates to.
* Ensure that email body string isn't unterminated.
  Using strncpy() needs to ensure that there is a nul termination byte,
  so this commits adds always writing a nul byte to the end of the buffer.
* Remove duplicate fault notification.
* Fix problem with scripts found via PATH with a '/' in parameters.
  Recent discussions on issue #101 led to discovering that if an
  executable without a fully qualified name was specified as a script
  and there was a '/' character in the parameters, then the path
  resolution would not work.
* Send SNMP traps when go from backup to fault due to sync group.
  Commit 020a9ab added executing notify_fault for vrrp instances
  transitioning from backup to fault state due to another instance
  in the sync group going to fault state. This commit adds sending
  SNMP traps in the same circumstance.
* Revert "Add instance_name/config_id to alert emails' subjects if
  configured". This should be handled by setting router_id
* Add config option to send smtp-alerts to file rather than send emails
  This is useful for debugging purposes.
* Add additional entry to Travis-CI build matrix.
* Fix segfault if no sorry server configured for a virtual server.
  Issue #751 identified a segfault in vs_end_handler(), and it
  transpires that the forwarding method of the sorry server was being
  checked without first testing that a sorry server had been configured.
* Improve the log message when a master receives higher priority advert.
  The log message reported in issue #754
  "VRRP_Instance(VI_1) Received advert with higher priority 253, ours 253"
  is somewhat misleading since 253 == 253.
  This commit improves the log message in this case be reporting that
  the sender's IP address is higher and the priority is equal. It also
  states the it was a master receiving the advert.
* First stage of making --enable-debug work
  Issue #582 identified that compiling with --enable-debug produced
  an executable that didn't work.
  This commit largely makes that option work, but there needs to be
  more work to make signals work.
* Generalise handling of signals.
* Don't assume json header files are in /usr/include/json-c
  Use pkg-config to find the location of the json header files
  when testing for the presence of the header files in configure.
* Add file updated by change.
* Log more helpful message when healthchecker activated or suspended
  Include the realserver in the log message
* Fix building with musl libc.
* fix spelling mistakes about keyword promote_secondaries in man page.
Release 1.4.0
* Add Linux build and runtime versions to -v output.
* Log kernel version and build kernel version to log at startup.
* Fix compiling with --enable-debug.
* Don't sleep for 1 send when exiting vrrp process if no vrrp instances.
* Streamline and rationalise use of child_finder function.
  The child_finder function is simplified, and also stop using the
  parent process' child_finder function in the checker process.
* Don't request bug report if script terminates due to seg fault.
  The report_child_status() function would log a message requesting a
  bug report if a check_misc script or a vrrp_track script exited due
  to a seg fault.
*  Handle vrrp track and check_misc scripts being killed by signal.
*  Rationalise reporting of child process exit status.
  report_child_status() is now only called in the main keepalived
  program. The reporting of the exit status of vrrp track scripts
  and MISC_CHECK scripts is now handled in the specific code for
  those scripts. This means that non 0 exit statuses aren't
  repeatedly reported for vrrp track scripts.
* eally fix reporting of child process exit status.
* Log a helpful message i using mem-check and too many allocs.
  keepalived simply being terminated by SIGABRT with no diagnostic
  message was unhelpful.
* Rename child_finder() to child_finder_name() etc
  The function only finds the name of the child process, and not
  the thread for the child process, so rename the function accordingly.
* Add log to file and no syslog options.
  With large configurations the syslog can get flooded and drop output.
  This commit adds options to not log to syslog, and also to log all
  output to files.
* Add option to only flush log files before forking.
* Don't poll netlink for all interfaces each time add a VMAC.
  We can poll for the individual interface details which significantly
  reduces what we have to process.
* Print interface details in output.
* Be consistent with type of size parameter for mlists.
* Fix sign conversion warnings.
* Add high performace child finder code.
  The code to find the relevant thread to execute afer a child process
  (either a vrrp track script or a misc_check healthchecker) was doing
  a linear search for the matching pid, which if there are a large number
  of child processes running could become time consuming.
  The code now will enable high performance child finding, based on using
  mlists hashed by the pid, if there are 32 or more vrrp track scripts or
  misc check healthcheckers. The size of the mlist is based on the number
  of scripts, with a limit of 256.
* Improve high performance child termination timeout code.
* Fix high performance child finder cleanup code.
* Preserve filename in script path name resolution.
  Some executables change their behaviour depending on the name by
  which they are invoked (e.g. /usr/sbin/pidof when it is a link to
  /usr/sbin/killall5). Using realpath() changes the file name part
  if it is a symbolic link. This commit resolves all symbolic links
  to directories, but leaves the file name part unaltered. It then
  checks the security of both the path to the link and the path to
  the real file.
* Handle scripts names that are symbolic links properly.
* Use fstatat() rather than stat() for checking script security.
  If we use fstatat() we can discover if a file is a symbolic
  link and treat it accordingly.
* Fix building with kernels older than v4.4.
* Fix building with --disable-lipiptc and --enable-dynamic-linking.
* Fix building with --without-vrrp configure option.
* Resolve unused return value warning.
* Fix some RFC SNMP issues.
* Attempt to fix mock builds.
* Fix parsing of broadcast + and broadcast -
* check_http.c: http_get_check_compare crash fixed in case of absense
  of digest.
* Add -pie linker option.
  Since -fPIE is specified for the compiler, -pie should be specified
  for the linker.
* check_http.c: http_get_check_compare crash fixed in case of absense o.
* Fix use S_PATH and fchdir().
  S_PATH wasn't defined until Linux 2.6.39 and fchdir() doesn't work
  with S_PATH until Linux 3.5 (according to open(2) man page).
* Fix building with Linux versions between 2.6.39 and 3.3
  Linux 2.6.39 introduced ipsets, but the kernel had some omissions
  from linux/netfilter/ipset/ip_set.h header file, so the libipset
  provided version needed to be used.
  Note: RedHat backported ipsets to at least 2.6.32, so the problem
  applied to earlier versions of RedHat Linux and Centos.
* Fix segfault when parsing invalid real server.
  If the first real server ip address doesn't match the address
  family of the virtual server, then we need to skip parsing the
  rest of the real_server block.
* Make when vs_end_handler is executed
  Commit 1ba7180b ('ipvs: new service option "ip_family"') added a
  sublevel_end_handler vs_end_handler, but this was being executed
  at the end of each real_server rather than after the virtual_server.
  This commit adds a new parser function install_root_end_handler(),
  and vs_end_handler is now installed using that function so that it
  is executed at the end of the virtual_server rather than after each
* Allow tunnelled rs address family not to match vs family.
  The address family of a tunnelled real server does not have to
  match the address family of its virtual server, so we need to
  delay any setting of the vs address family from an rs address
  until the end of the real_server block, so that we know whether
  the forwarding method is tunnelling or not. Likewise the check
  of the sorry server has to be delayed until the end of the
  virtual server configuration (the tunnelling method may be
  specified after the address of the real/sorry server).
  The address family of a virtual server is only not determined
  by the virtual server configuration itself if the virtual server
  is defined by a fwmark and all of the real/sorry servers are
  tunnelled. In this case the address family cannot properly be
  determined from the address family of any tunnelled real servers.
  However, to maintain backward compatibility with configurations
  used prior to this commit, the address family of the virtual
  server will be taken from the address family of the (tunnelled)
  real/sorry servers if they are all the same; if they are not all
  the same it will default to IPv4 (this is not incompatible since
  previously mixed IPv4 and IPv6 real/sorry servers were not allowed,
  even if tunnelled).
* Remove bogus warning for fwmark virtual servers.
  "Warning: Virtual server FWM 83: protocol specified for fwmark
  - protocol will be ignored" should not be given if no protocol has
  been specified.
* Fix removing left-over addresses if keepalived aborts.
* Fix use of init_state after a reload.
  Issue #627 identified that vrrp->init_state was being incorrectly
  used in vrrp_fault(), since it is modified at a reload.
  Instead of using init_state, we now use the configured priority
  of the vrrp instance, so if the vrrp instance is the address owner
  (priority 255) it will transition to master after leaving to fault
  state, otherwise it transitions to backup.
* Remove init_state from vrrp structure
  init_state is no longer used, so remove it from the vrrp structure.
  Since it has been included in keepalived SNMP, it is preserved
  solely for reporting in SNMP requests.
* Change conditional compilation _WITH_SNMP_KEEPALIVED_ to
  The functionality that the conditional compilation enabled was snmp
  vrrp functionality, so make the name more relevant.
* Update error message in
* Add more configure options to Travis build matrix.
* Install additional libraries in Travis environment for new options.
* Fix some problem found by Travis-ci.
* Fix configure --disable-checksum-compat option.
* Remove DOS file formatting from .travis.yml.
* Add more configuration option to Travis builds and some build fixes.
* Tidy up some code alignment.
* Update openssl use to stop using deprecated functions
  openssl from version 1.1 deprecated certain functions that keepalived
  was using. This commit ceases using those functions if the version
  of openssl is >= 1.1.
* Fix some issues identified by valgrind.
  Some file descriptors weren't being closed at exit, and also one
  or two mallocs weren't being freed.
* Set pointer to NULL after FREE_PTR() unless exiting.
* Allow sync groups with only 1 member, but issue a warning.
* Fix building with LibreSSL version of OpenSSL.
  Unfortunately LibreSSL updates OPENSSL_VERSION_NUMBER, and its value
  is higher that OpenSSL's latest version. When checking the version
  number we need to check that we are not using LibreSSL (by checking
  whether LIBRESSL_VERSION_NUMBER is defined).
  LibreSSL also hasn't implemented the new functions that OpenSSL has
  provided to replace functions that are deprecated or it is recommended
  should not be used, and so if using LibreSSL the old functions need
  to be used.
* Update genhash to stop using deprecated functions openssl functions.
* Remove last few Subversion source file version Id strings.
  Some of the genhash source code still had Subversion Id strings,
  and these are now removed.
* Add copyright update script.
* Copyright update.
* Remove outdated Version comment.
* Fix update copyright script.
* Include files in copyright update.
* Add replaceable parameters in configuration files.
* Fix some MALLOC/FREE issues with config parameters.
* Add multiline configuration definitions.
* Remove debugging messages left in lib/parser.c.
* Fix a FREE error.
* Fix keepalived.conf(5) man page.
* Fix type in keepalived.conf(5) man page.
* Suppress error message when removing leftover addresses at startup.
Release 1.3.9
* Stop segfault if SSL context cannot be initialised.
* Don't leave point to SSL data after freeing it.
* Fix memory leak if duplicate SSL context values specified.
* Don't initialise an SSL context if it isn't being used.
* Checksum compatibility should refer to v1.3.6.
* Update for differences between Fedora and CentOS.
* change hash to something more even and hash size accordingly.
* also update size of hash in free_list.
Release 1.3.8
* parser: do not exit when glob() doesn't match any files.
* Use nodename as default id for conditional configuration.
  If the node name returned by uname() is, then
  lines in the configuration file matching @host123 will match the
  conditional configuration test. This means that it is no longer
  necessary to specify the -i command line option if the conditional
  configuration string used in the configuration is the node name.
* Option --i/--config-id parameter is not optional.
  Since the config-id defaults to the hostname, there is no point
  in allowing --config-id to be used without a parameter, just to mean 
  use the hostname.
* Use NULL instead of 0 for pointers in get_longopts struct. 
* Some minor tidying up of the new JSON output code.
  1. Use SIGRTMIN+2 rather than (_SIGRTMIN + 4)
  2. Don't include JSON code if not building with VRRP
  3. Some code alignment fixes
  4. Some conditional compilation additions
* Add --signum command line option to report signal numbers.
  Since keepalived is starting to use real time signals, and those
  signal numbers are not fixes, this commit introduces a way to
  ask keepalived to report those signal numbers.
* Stop command line option -i segfaulting.
* Fix config include files when file has no directory par.
  When an include file name has no directory part, there is no
  directory to change to, so don't try to do so.
* Use getcwd() malloc functionality if available.
* Add support for csh brace globs in config file names.
* Update documentation for config file include directive.
* Use fchdir() when changing direcories while reading include files.
  The getcwd(3) man page recommends using open()/fchdir() rather than
  getcwd()/chdir() since fchdir() is guarantee to return to the previous
  directory even if directories have been renamed in between the first
  chdir and the second. It also suggests that it is faster, and saves
  mallocs or allocation of arrays on the stack of size PATH_MAX.
* Use alloc_value_block() for vrrp_vip_handler().
* Fix whitespace error introduced in commit 9458c9b9.
* Reinforce that '@' conditional config character must be 1st on line.
  The '@' conditional configuration character must be the very first
  on a configuration, meaning that there cannot even by whitespace
  before the '@' character.
* Check whether GLOB_BRACE is supported (it is not part of POSIX.2).
* When building a docker image, it appears that autoheader is required.
* Fix IPVS virtual server setup with persistence.
* Remove a merge conflict .rej file accidentally added to git. 
  This commit also updates the .gitconfig file to ensure that .rej
  files will not be added in the future. 
* config synopsis - cleanup line endings and comment alignment.
* conf examples - clean eol whitespace.
* conf examples - clean triple line breaks. 
* add pair of config options used in misc_check.
* clean surprise tab character.
* many whitespace fixes; some missing docu added to synopsis.
* config docs - apply code review markups.
* Trivial updates to latest format cleaning patches.
* Allow conditional configuration to work with include statements.
* Allow '@' conditional configuration to be preceeded by whitespace.
Release 1.3.7
* Allow broadcast address to be specified as '-' or '+'
  When configuring an ip address with a broadcast address, allow the
  use of - and + (like ip(8)) to clear or set the host specfic bits of
  the address, i.e. broadcast + result in a broadcast address of broadcast - results in a broadcast address of
* Change some code layout and macro/variable names
* Print unicast peer addresses in /tmp/
* Add negative conditional configuration.
  A configuration line starting @main will only be included if
  keepalived is started with option -i main.
  This commit adds configuration option @^main, meaning that the
  remainder of the configuration line will only be included if
  -i main was NOT specified.
* Fix calculation of checksum for VRRPv3 IPv4 unicast peers.
  Alternate unicast peers were being sent adverts with the checksum
  set to 0. The reason for this was that the checksum field was not
  being set to 0 before the checksum calculation, hence causing the
  calculated checksum to be 0 for the second, fourth, sixth etc
  unicast peer.
* Generate README from
* Only declare (and use) auth variables if compiling with authentication.
  authtype_mismatch and auth_failure are only used if authentication is
* The vrrp_t vmac flag should be a bool.
* Add include guard for vrrp_print.h.
* Log some additional vrrp variables.
* Make checksum change backwards compatible.
  This commits adds the ability of keepalived to revert to using the old
  checksum calculation if it sees an advert that has an old checksum. This
  means that if an old and a new version of keepalived are working
  together, once the new version has seen an advert from an old version,
  it will drop back to using the old style checksum, and so the two
  keepalived instances will work together.
  There is a slight problem with this, though. If the old version starts
  when a new version is master, if will report bad checksums. This should
  be fine, since keepalived should discard the adverts, time out and send
  an advert which would make the new keepalived revert to old checksums.
  Unfortunately, keepalived does not completely ignore bad adverts, since
  it resets its master down timer, even for bad adverts, and so it never
  times out. However, in this scenario, there will still remain one master
  and all the other keepalived instances will be in backup state, and so
  VRRP functionality is preserved.
  As identified in commit bcf2936 until commit 67275d2 keepalived did not
  work with VRRPv3 and more than one other unicast peer, so for migration
  we only need to consider two unicast peers. To upgrade, first upgrade
  the keepalived instance that is in backup mode. This will see old
  checksums when it starts, and so start using old checksums. The other
  keepalived instance can then be upgraded and it will also see old
  checksums when it starts up. In order to switch to using new checksums,
  temporarily add the following line in the configuration of each vrrp
  instance that is in master state:
  old_unicast_checksum never
  and then reload the keepalived instance by sending it SIGHUP. After the
  master has restarted, restart the backup with a SIGHUP, and they will
  then be using new checksums. The temporary old_unicast_checksum never
  lines can now be removed from the configuration.
* Add checker bind_if keyword.
  If a checker binds to a link local IPv6 address, the interface has
  to be specified.
* Make DBus service name configurable.
* Make --config-id option default to hostname.
  This is the equivalent of specifying --config-id `hostname -s`, and
  makes it more straightforward to deploy the same configuration to
  multiple hosts.
* Issue warning if more than 1 dynamic misc_checker per real server.
  If different scripts return different exit statuses, the priority
  of the real server will keep changing. The solution is to combine
  the functionality into 1 script.
* Improve DBus error handling.
  . Always clear errors to avoid leaks
  . Check for errors when emitting signals
  . Check for errors when registering objects
* Stop test tcp_server leaving zombie processes.
* Fix persistence_granularity handling
  1. vs-<>>addr.ss_family should never be used to check address family of
     vs since there may not be an address is using fwmark.
  2. If using fwmark, the address family may not be known when parsing
  3. Set address family from format of persistence_granularity if not
     already set
  4. Ensure entire string is a number and is between 1 and 128 for IPv6
  5. Ensure netmask specified for IPv4 is solid
* Ensure always check return from inet_stosockaddr when parsing config.
* Add lthreshold and uthreshold to keepalived.SYNOPSIS.
* Merge virtual server group addresses and ranges into one list.
  A single address can be treated as a range with only 1 address, so
  this reduces the number of lists that need to be processed when
  handling a virtual server group.
  A number of corrections were also made re hton/ntoh(s|l).
* Remove redundant setting of real server weight.
* Don't use vs-<>>addr.ss_family for address family of virtual server.
  A virtual server won't use vs-<>>addr if it is defined by a fwmark or
  it is uses a firtual server group. vs-<>>af is the correct field to use.
* Make ipvs_update_stats() little/big endian aware.
* Simplify ipvs_update_stats().
  Don't run a state machine to collect all the stats, simple iterate
  through the entries.
* Move fetching ipvs stats into ipvs_update_vs_stats().
* Remove some #defines in ipvs_update_stats().
* Streamline setup for changing ipvs configuration.
* Fix updating resolved notify script path names with parameters.
* Add silent option to test/tcp_server.
* Document default checker connect ip/port.
* Remove duplicate setting up of file name.
* Validate HTTP_GET and SSL_GET checkers.
  Unsure that urls have a path specified, and that the checkers have
  at least one url specified.
* Fix memory leak if SMTP_CHECK helo_name specified.
* Fix dumping of SMTP_CHECK host list.
* Don't allocate and copy default SMTP_CHECK helo name unless needed.
* Tidy up dumping SMTP checkers.
* Remove smtp_host_t typedef.
  If is passed to functions that take a conn_opts_t parameter, so
  we need to explicitly use the correct type.
* Simplify handling of host{} block in SMTP_CHECK.
  This also allows specifying connect_ip, connect_port as well as
  unsing host blocks.
* Add DNS_CHECK RRSIG and DNSKEY query types.
* Fix documentation re MISC_CHECK.
* Detect if no misc_path specified for MISC_CHECK.
  If no path was specified, keepalived was segfaulting.
* Add some more error messages to socket_bind_connect().
* Checker connections aren't always TCP.
* Report if checker bind_if is missing
  If a link local IPv6 address is specified for a checker to
  connect to, then a bind interface must also be specified,
  otherwise the connect() call fails.
* If a real server has inhibit_on_failure, configure it at start up
  If a real server had inhibit_on_failure set, but it also had an
  alpha mode checker, then the real server should be installed at
  startup with weight 0 to be consistent with what would happen if
  the checker had been successful but then failed.
* Improve handling of virtual server groups.
  If multiple virtual servers use the same virtual server group, and
  the virtual servers have different protocols, or the virtual server
  groups are defined using only fwmarks and the virtual servers have
  different address families, then multiple versions of the entries
  in the virtual server groups will need to be created as IPVS
  virtual servers.
  This patch handles the creation and removal of the necessary different
  virtual servers for the virtual server groups.
* Add virtual server protocol types SCTP and none for SNMP.
* Handle virtual server with no protocol specified
  This is valid if fwmarks are being used.
* Warn if a protocol is set on a virtual server using firewall marks.
* Don't check !LIST_ISEMPTY(vs-<>>rs) after config is validated
  In validate_check_config() any virtual server without any real
  servers is removed, so there is no need to check subsequently.
* Don't allow virtual server groups without any addresses for fwmarks.
* Fix and optimise handling of promote_secondaries.
  The promote_secondaries flag was being cleared by the first vrrp
  instance that stopped using an interface, rather than by the last
* Fix the setting of mcast address for checksum compatibility
  It was using INADDR_VRRP_GROUP rather than vrrp_mcast_group4.
Release 1.3.6
* Ensure locations of pid files is consistent
  Issue #563 identified that the generated keepalived.service has the
  wrong location for the pid file. On investigating this it was discovered
  that keepalived isn't following the GNU coding standards for location of
  pid files; however, we can't now move the default location of pid files.
  This commit ensures that the keepalived.service file's location for pid
  files is consistent with where keepalived is placing them, but also adds
  a configure option --enable-gnu-std-paths, which means that keepalived
  will use ${localstatedir} for the location of pid files, while the default
  remains /var/run
* Stop logging that preferred_lft has been set to 0.
  Some users are interpreting the message as a warning, and hence are
  unnecessarily avoiding using a /128 netmask for IPv6 addresses. The
  message doesn't really tell us anything useful, so remove it.
* Handle not being able to load ip_tables or ip6_tables modules.
  When running in a docker container it isn't possible to load kernel
  modules, so we need to cleanly handle a failure to load the modules.
* Don't segfault if unable to load ip_vs module.
  In a docker container it isn't possible to load a kernel module. The
  check code was detecting that it couldn't load the module, but the
  checker process, when cleaning up prior to exiting, was assuming that
  certain pointers had been initialised which hadn't been when an error
  was detected so early in the initialisation.
  This commit adds testing for uninitialised pointers during the exit
* Fix releasing malloc'd memory for saved core pattern.
* Fix memory leak when adding iptables entries.
* Handle missing virtual server configuration.
  keepalived was segfaulting if a virtual server had no real servers
  configured. There were also issues of checkers running even if there
  was missing essential configuration from a virtual server which meant
  it could be set up. The problems were a virtual server group specified
  but it didn't exist, a virtual server group with no configuration, and
  a virtual server address family not match the address family of a virtual
  server group.
* Don't attempt to remove ipsets if ipset handling not initialised.
* Delay initialising IPVS until affter processing configuration.
  If IPVS isn't configured, there is not point in loading the ip_vs
* Fix conditional compilation tests for _HAVE_LIBNL3_
* Make dynamic flag bool.
* Don't report exit status of misc_check scripts.
  The result of a change in status from a misc_check script is reported
  by the code anyway, so to log any non-zero exit code is superfluous and
* Work around conflict between kernel and libipset header files.
  ipset copies linux/netfilter/ipset/ip_set.h (and other) header
  files, producing local copies that are installed as
  libipset/linux_ip_set.h etc as part of the libipset development
  package. Unfortunately although the kernel changes the include
  guards when processing its source code, ipset does not, and so
  the duplicated header files have different include guards.
  This patch detects if the include guards don't match, and if so
  if linux/netfilter/ipset/ip_set.h is included, it defines the
  include guard used by libipset/linux_ip_set.h before the latter is
  indirectly included.
* add Dockerfile.
* Fix detecting default script uid/gid.
* Stop segfault when keepalived can't load ip_vs module.
* Add some additional docker support files and add make target docker.
  The configuration file installed by make install isn't ideal to run
  keepalived with, so add a simple keepalived.conf that will be
  installed into the container.
  Add make target docker, to build the docker image.
  Add docker/README to give some information about building and using
  containers (this is mainly so that I don't forget how to the details).
* Remove a line of debugging code.
* Don't complain about keepalived_script user if not needed.
  keepalived logged a warning every time if the keepalived_script user
  didn't exist. We only need that warning if there is a script that uses
  the default user, and an alternative defult user isn't specified.
* Fix relative script path names with embedded spaces.
  The space wasn't being restored after resolving the path name.
* Fix memory leak if notify scripts specified multiple times.
* Remove some residual debugging messages.
* Fix memory leak if quorum up/down scripts specified multiple times.
* Use realpath() to canonicalize script names.
* Fix missing PARAMETER_UNSET, which caused the global value of
  vrrp_higher_prio_send_advert not to be used for each VRRP instance.
* Remove unused variable introduced in commit 1c5bfa29.
* Fix using virtual server groups following commit 5ca36cb.
* Set address port to be sequence number for virtual server group.
  The format_vs() function uses the virtual server address port as
  the sequence number of the virtual server instance using the virtual
  server group, so we need to set it up.
* Warn if real server has no checkers when alpha mode.
  If a virtual server is configured with alpha mode, and a real server
  has no checkers, the real server will never be able to be activated,
  so generate an appropriate warning.
* Only delete virtual server once if using a virtual server group.
  If multiple virtual servers are using a virtual server group, the
  virtual servers are defined by the virtual server group, and so they
  should only be deleted for the first virtual server using the group.
  There is still an issue that the configuration of all virtual servers
  using the virtual server group needs to be consistent.
* Add further checks for LVS configuration.
* Document additional scheduling algorithms for IPVS.
* Change virtual_server_t loadbalancing_kind to forwarding_method.
  The variable name loadbalancing_kind didn't represent the meaning of
  the parameter, so change it to forwarding_method.
* Add fo and ovf scheduling types to SNMP.
* Only check one packet scheduling if supported.
* Add lvs_method per real server.
  The lvs_method should be settable for each real server within a
  virtual server. This commit maintains existing default behaviour
  by using the lvs_method set against the virtual server as the default
  for the real servers, but adds the option to configure the lvs_method
  individually for each real server.
* Fix type in printing config of scripts.
* Convert some spaces to tabs.
* logger: output timestamps to console logs.
* Optimise handling of config_id in parser.
* Fix some typos.
* prog_type variable doesn't make sense when building a DEBUG version.
  The DEBUG version runs everything in a single process, and to the
  prog_type variable is meaningless in this case. This commit excludes
  the prog_type variable by conditional compilation when building a
  DEBUG version.
* Add home, -nodad, mngtmpaddr, noprefixroute, and autojoin address flags.
* Update documentation for commit cc67476.
* Add notify FIFO.
  pull requests #568 and #587 and issue #584 have all identified that if
  notify scripts are run in close succession, then order if processing of
  those scripts is indeterminate, and this is causing systems that are
  monitoring the state of vrrp instances to have the wrong state.
  There have been various suggestions about how this should be resolved,
  principally along the lines that the notify scripts should be run
  synchronously, i.e. a notify script should not be run until the previous
  notify script completed. While this would work, it adds some overhead to
  keepalived, which currently does not monitor the exit status of notify
  There is a further issue with notify scripts that if a large number of
  events occur in rapid succession (e.g. due to an interface flapping), this
  can cause a large number of child processes to be created very rapidly.
  This commit adds an alternative method for external processes receiving
  notification of events. Instead of forking a script for each event, keepalived
  will write to a named pipe. An external process can then read the pipe to
  receive notification of events, and process them appropriately. This is
  guaranteed to deliver events in the correct order. It also has the benefit
  that there isn't the overhead of forking a child process for each event.
* If can't get local host name, set default router_id to "[unknown]".
  Issue #588 reported that keepalived was segfaulting when generating
  an SNMP trap in strlen(global_data-<>>router_id), which presumable is
  due to global_data-<>>router_id being NULL. As a precaution set
  router_id to "[unknown]" if get_local_name() fails".
* Implement SNMP reporting smtpServerPort.
  Commit 128cd24 added functionality for specifying smtp server port
  and commit bcb09b8a added smtpServerPort to the keepalived MIB, but
  no code was added to report the port. This commit adds that functionality.
* Don't use PATH when executing FIFO script.
  The path has already been resolved as part of checking the script
  security, so there is no need to search the path.
* Log error if unable to execute FIFO notify script.
* Pass FIFO name to notify_fifo_script as parameter.
* Add FIFO notify for LVS notifies.
  To match the FIFO notifies for VRRP, this commit adds FIFO notifies
  for LVS. There are now three FIFOs available, a global one that
  will send output for VRRP and LVS, one for VRRP only and one for
  LVS only.
* Fix conditional compilation for --enable-debug
  Commit 7947247 attempted to sort out making keepalived work with
  --enable-debug, but unfortunately it used the wrong conditional
  compilation variable (DEBUG instead of _DEBUG_). This commit
  corrects the conditional compilation tests.
* Include protocol in virtual and real server output.
* Stop segfaulting if no script given for a vrrp_script.
* Fix a _DEBUG_ conditional compilation test.
* Fix incorrect expression in clear_services().
* Fix use htons() instead of ntohs().
* Fix bad file descriptor error at reload with no virtual servers.
* Delete disabled inhibit servers at reload.
* Add logging to remove sorry server at reload.
* Delete disabled inhibit servers at reload.
* Fix thread_cancel() for timed out threads.
* build: add basic .travis.yml file
* rename from README.
* build: add build status tag in readme file
  All that's needed now, is for user `acassen` to
  go to `` login with the Github
  account, import repos from Github, and enable build
  for keepalived [a checkbox/button].
* Set sorry_server's fowarding_method.
* Further fix for thread_cancel() for child timeout threads.
  Commit ade3d699 fixed removing read and write timeout threads
  from the ready queue when they are cancelled. This commits adds
  removing child timeout threads from the ready queue too.
* Fix warnings from ignoring seteuid/setegid return results.
* Fix dynamic linking with early versions of libnl3 without nla_get_s32.
* Updated autoconf files due to autoconf upgrade.
* Fix compiling with namespace collisions in net/if.h and linux.if.h.
* Update travis configuration.
  This commit includes the installation of development library
  packages, updated kernel header files, using trusty for the builds,
  and adding more build options.
* Reinstate distributing (renamed) file.
* More updates for updated automake/autoconf.
* Fix new warnings produced by gcc 7.
*  Migrate failed checkers at reload (provisional implementation).
* Implement comparison of checkers.
  genhash: libraries to link with should be put in LDADD, not LDFLAGS.
* fixed build on older systems, namely CentOS 6.
  Provide AS_VAR_COPY if missing and downgrade autoconf dep to 2.63.
* Fix worng migrate of checker-id.
* Set active if new failed_checkers is empty.
* Fix typo in interface details printing.
* Enable vmacs to work when sysctl net.ipv4.conf.all.rp_filter <>> 0.
  A number of distros now set net.ipv4.conf.all.rp_filter = 1 by default.
  This means that when a vrrp instance is in the master state, it cannot
  receive adverts sent by a higher priority master, and hence we end up
  with 2 masters.
  I tried an alternative of receiving on the base interface, but no packets
  that have the same source MAC address as an interface on the system
  (i.e. the vmac interface) get delivered to the socket.
  For distros such as Fedora, RHEL, CentOS, ArchLinux, all.rp_filter = 1
  due to systemd commit
  The reason given for the commit is to work around a boot-time race condition
  where interfaces created before default.rp_filter is set do not get the
  updated default.rp_filter setting, and so the all.rp_filter setting is used
  to override the individual interface settings. This doesn't seem the right
  solution to the problem, since it prevents any interface running with
  rp_filter = 0, and that is what we need for vmacs. I have filed an issue
  report for systemd at, but
  in the mean time we need to work around the issue. Ubuntu sets all.rp_filter=1
  in /etc/sysctl.d/10-network-security.conf provided by the procps package.
  Debian doesn't set all.rp_filter.
  The only solution I have found, and I am not entirely happy with this since
  it has effects beyond keepalived and affects the system as a whole, is to set
  all.rp_filter = 0. In order to seek not to change the operation of the system,
  if default.rp_filter <<> all.rp_filter, default.rp_filter is set to all.rp_filter,
  thereby ensuring that any new interfaces created will take the original value
  of all.rp_filter. It then iterates through all existing interfaces, and
  {interface}.rp_filter is set to the value of all.rp_filter if
  {interface}.rp_filter <<> all.rp_filter. all.rp_filter is then set to 0.
  This means that all interfaces should behave in the same way as before, since
  the behaviour of rp_filter is defined by the maximum of
  {interface,all}.rp_filter, but we are not able to operate the vmac interfaces
  with rp_filter = 0. When keepalived exists, it restores the original settings
  of rp_filter if they are the same as what we set them to.
* Only restore rp_filter on interfaces if same as we set them to.
  If rp_filter has been altered since we set it, then do not restore
  it to the original value.
* Update files for build fix commits.
  Commits 2cccc97 and a932cf2 provided fixes for building on CentOS6.
  This commit updates genhash/ in line with
  genhash/ and adds a comment to regarding
  when autoconf introduced support of AS_VAR_COPY.
* Fix build error at when _HAVE_IPV4_DEVCONF_ was undefined.
* Remove unnecessary parameter compare.
* Resolve compiler warning introduced by commit 8361b11.
* Remove debugging log messages added in commits 99fe626 and 6ec26e0.
* Fix compiler warning and remove unwanted log messages.
* Make a couple of checker variables non global.
* Correct comparison for checker compare in migrate_failed_checkers.
  Commit 2ff6b3f changed the sense of the comparisons of checkers,
  but didn't make the corresponding change to checking the result.
* Fix keepalived.doc(5) man page.
* Add virtualhost config for real servers.
  Different real servers may want different virtualhost config
  settings. The real server virtualhost setting overrides the
  virtual server virtualhost setting.
* Allow virtualhost to be specified per checker and per url.
* Fix compiling with SNMP enabled.
* Fix compiler warnings when use configure --enable-conversion-checks.
* Fix an unintentional case fall-through.
  gcc 7 identified two case statement fall-throughs. One was intentional,
  but the other was a bug. The latter is now fixed, a comment is added
  for the former so the warning isn't generated.
* Fix commit cc67476 to allow flags for static and virtual ip addresses.
* Fix handling of more recent ip address flags.
  Recent ip address flags have exceeded 8 bits, and so the IFA_FLAGS
  attribute needs to be used, rather than the ifa_flags field.
* Fix typo in help.
Release 1.3.5
* Ensure nopreempt is not set if address owner.
* Remove hardcoded paths from init files.
* Add configure option to override system init type.
* Fix some configure tests for init type.
* Add support for ip rules uidrange option.
  This option was added in Linux 4.10.
* Resolve compiler warning on 32 bit systems.
  There were two warnings in lib/timer.c for signed vs. unsigned
  comparisons on 32 bit systems.
* Add missing documentation for ip rule uidrange.
* Include snapcraft.yaml tar file.
* Remove extraneous EXTRA_DIST directory.
* Add library requirements for ArchLinux.
* Allow tracking and misc_check scripts time to terminate after
  timeout. If a script exceeds the timeout, it is sent a SIGTERM,
  and then if it still doesn't terminate, it is sent a SIGKILL.
  The problem was that the script was only allowed 2 microseconds
  to terminate, whereas it should have been 2 seconds.
* Fix script paths when converted to absolute path names.
  If a tracking or misc_check script is not specified by a fully
  qualified path name, but rather it is resolved via PATH, the updated
  patch name wasn't being saved for tracking or misc_check scripts.
* Remove yet more hardcoded paths.
* Make git ignore keepalived.service file.
* Streamline signal handling initialisation.
* Report track script name if it times out.
  keepalived was simply reporting that pid nnnn had timed out, which
  didn't give any indication of what script it was that had timed out.
  This patch now means that the script name will be logged rather than
  the pid.
* Fix conditional configuration for config read via alloc_value_block().
  The code for handling conditional configuration was in the wrong function.
  This commit move it to read_line() so all configuration is read in the
  context of @system_id conditional lines.
* Fix compiling with --disable-vrrp.
  When building without vrrp, the checker process still needs to
  know about IP address creationg and deletion in order to allow the
  ha_suspend configuration option to work.
* The checker process never needs to monitor interfaces.
* Move vrrp_ipvs_needed() to vrrp_daemon.c.
* Remove some unnecessary includes of check_data.h.
* Make ha_suspend work when building without vrrp.
  Support of ha_suspend was only enabled when keepalived was built
  with vrrp support. There may be other processes that are adding and
  deleting ip addresses, so support of ha_suspend should be enabled when
  building without vrrp support.
  Also, the vrrp process doesn't need to call the update_checker_activity()
  function when addresses are added or deleted.
* Don't use netlink address monitoring if not using ha_suspend.
* Make --release-vips (-X) option work.
  'X' was not included in the optstring for getopt_long(), and so
  --release-vips option was not recognised.
  Further, only enable VRRP and checker specific options if compiled
  with that functionality.
* Only report added/deleted addresses if relevant to keepalived.
  Logs could get full of messages reporting address addition/deletion
  that were of no relevance to keepalived. By default, keepalived will
  now only report address additions/deletions with the -D option if
  the address is relevant to keepalived.
  The -a option is added to log all address additions/deletions.
* Remove all #ifdef _WITH_LVS_ from checker code.
  If building the checker code, _WITH_LVS_ is always defined (_WITH_LVS_
  means build the checker code), so there is no point testing if it is
  defined in any of the checker code.
* Only include vrrp header files when building with vrrp and also for
  check. Make sure vrrp header files are only included if building with
  vrrp (i.e. without --disable-vrrp), and likewise only include check
  header files if compiling with LVS support (i.e. without --disable-lvs).
* Add test/tcp_server.c for testing TCP_CHECK.
* Make -a option work without ha_suspend.
* Fix integer types. The correct, standard integer types are uint8_t and
  uint16_t, not u_int8_t nor u_int16_t (the latter being kernel types).
  glibc and uClibc may define the kernel-compatible types, but musl (which
  is standards-compliant) does not.
* Fix warning when compiling without libnl.
* Add including  where those types are used.
* Add option to not use dlopen() for libipset, but link at link time.
* Remove superfluous (duplicated) block of code.
* Add option for dynamic (run-time) linking to libip[46]tc.
* Fix dynamic linking of libiptc without ipsets.
* Check iptables/ip6tables commands available before using them.
* Fix some conversion check compiler warnings.
* Make configure option --disable-routes do something.
* Don't link to libdl if not needed.
* Fix compilation with --disable-vrrp.
* Don't link to libraries not required by configuration.
* Remove all authentication code if --disable-vrrp-auth specified.
* Remove FALLBACK_LIBNL1 and use existing _HAVE_LIBNL1_ instead.
  There was no point in a separate FALLBACK_LIBNL1 since it and
  _HAVE_LIBNL1_ always had the same value.
* Add udp functionality to tcp_server test program.
* Fix check_conditional_tests script.
* Add option for dynamic (run-time) linking to libxtables.
* First stage of run-time linking to libnl-3.
* Dynamic/static linking options of libnl/libnl-3, libip[46]tc and
  libipset. libnl/libnl-3, libip[46]tc and libipset can all be dynamically
  linked at run-time, and if they are not available, keepalvied will use
  the alternative code which is used when the libraries cannot be linked
  a build time.
  This means that a single executable keepalived can be created that will
  use the libraries if they are installed on the target system, but will
  fall back to the alternatives if the libraries are not available.
  This is useful for build environments such as Buildroot which will not
  force optional dependencies (see pull request #540), since now keepalived
  can be built so as not to force the optional dependencies, but to make
  use of them if they are installed.
* Fix building without libnl/libnl-3.
* Don't allow adver_int to be rounded down to 0.
* Fix creation of iptables entries on more recent kernels.
  On a 4.9.13 kernel iptables entries were being created with
  return-nomatch ! update-counters ! update-subcounters, as shown by
  the iptables command.
  Although it is not understood why these options are being added, it
  transpires that the problem occurs when using version one of the
  xt_info_set_match, but doesn't occur when using version 4 of the
  This patch ensures that the latest version of the structure that is
  supported by the kernel is always used.
* Fix updating /proc/sys/kernel/core_pattern.
  Reset file offset to beginning of file between reading the file and
  writing new contents.
* Fix printing of smtp_server port.
* Handle failure if fail dynamically to get address of a libipset function.
* Be defensive in case fail to get addres of a libipset function dynamically.
* Fix evaluation of library names for run-time linking.
* Show failed ipset dl function.
* Provide explicit DL error messages and fix autobuilt snap version.
* Fix formatting of email message for CHECK_SMTP failures.
  The format string passed to smtp_final() can contain format specifiers
  so a further pass through printf is required.
* Add printf format attribute to vlog_message().
* Add higher_prio_send_advert vrrp config option.
  There is a problem if two vrrp instances, due to becoming isolated,
  both become master, since they will both have sent GARP messages.
  Setting higher_prio_send_advert and garp_lower_priority_repeat means
  that if a master receives a higher priority advert, it will send its
  own lower priority advert before it transitions to backup. The higher
  priority master, on receiving a lower priority advert, will then send
  GARP messages, and so the ARP caches will then be correctly updated.
  Using the higher_prio_send_advert option may be considered not to
  conform to the VRRP protocol (725) to (765) in state description of
  RFC5798, however, since which of the two masters advertises first
  after they can both see each other again is random, there is a 50%
  chance that the lower priority instance will send an advert before the
  higher priority instance, so to all external observers it will appear
  that this is the case, or at least that the adverts overlapped.
* Fix higher_prio_send_advert in lower priority master.
* Load the ip_tables module if using iptables.
  We cannot guarantee that the ip_tables modules has been loaded, so
  we load it ourself if using libiptc.
* Fix (cosmetic) conditional compilation test.
* Fix building with --enable-libxtables-dynamic --disable-libiptc.
* Enable compilation with namespaces if SYS_setns is not defined.
* Fix compiling with struct xt_set_info_match_v0.
* Check to libnfnetlink.h and netlink.h with libnl v1 too.
* Workaround missing libraries from pkg-config --libs libiptc.
  Old version of libiptc don't report requirements on libip4tc and
  libip6tc, so check if the output from pkg-config is only -L.* -liptc
  and if so add -lip4tc -lip6tc.
Release 1.3.4
* Fix generation of lib/git-commit.h when building a tagged commit.
* Define GIT_DATE and GIT_YEAR when generating default git-commit.h
  This issue was caused by commit 5287f03 which didn't define GIT_DATE
  and GIT_YEAR in all circumstances.
Release 1.3.3
* Fix unitialised use of misck_checker in script timeout.
* Fix detection of no netlink being installed.
* Fix conditional compilation for LIBIPVS without netlink.
* Terminate child processes if parent dies.
  If the parent keepalived process is killed, the child processes will
  be orphaned and can cause problem when attempting to restart 
  keepalived. This patch makes use of prctl with PR_SET_PDEATHSIG such
  that all child processes will receive SIGTERM if the parent process 
* Ensure syslog and mem_check_log open before using them.
  A segfault was occuring when --enable-mem-check-log option was
  selected, due to attempting to write to the log file before it had
  been opened. It was also evident that there could be attempts to
  write to syslog before that had been opened too.
* Fix building on Centos 7/RHEL 7 re lightweight tunnel encapsulation.
  RedHat have partially backported lightweight tunnel encapsulation
  into their kernel, but not included MPLS or ILA. We need to have 
  conditional compilation for LWTUNNEL_ENCAP_MPLS and LWTUNNEL_ENCAP_ILA
  rather than just checking for RTA_ENCAP.
* Update documentation for tracking scripts weight 0.
  weight default is 0, which means tat a failure implies a FAULT state.
* Reinstate code checking module ip_vs loaded. 
  Commit d900df2 removed a bit to much code that looked as though it
  wasn't doing anything, with the result that the check of whether the
  ip_vs module was loaded didn't occur.
  This commit reinstates the code for checking, and if necessary loading,
  the ip_vs module, but also sanitises the code slightly.
* Fix some more compiler warnings.
* Fix a typo in a help message in
* sorry_server: keep sorry_server on reload. 
* sorry_server: set it up on start or reload if quorum is down.
  on start: in alpha mode.
  on reload: if changed, or no previous sorry_server.
* Added doc for priority 4th parameter to notify script. 
* ipwrapper.c: make functions void if return value not used or constant.
  Several functions in check/ipwrapper.c were always returnung the same
  value, and the code calling the functions then checked and returned an
  error if the return value was not the value always returned. Also, for
  some functions returning a value the return value was never checked in
  the calling function.
  Making the functions void, and removing the if (...) makes the code easier
  to read, and potentially slightly more efficient.
* Add snapcraft.yaml for CI build publication.
* Fix missing documentation for 4th parameter of notify action. 
* Make builds reproducable, and copyright date reflect latest commit. 
  Pull request #503 provided an update to facilitate reproducable builds, 
  and also ensure that the copyright date doesn't postdate the last source
  code modification. Unfortunately the commits required manual updates to
  change the copyright year, thereby creating maintainability issues. The
  commit also allowed fake build dates to be specified.
  This commit takes an alternative approach, and takes the dates used for
  the copyright message and the version date from the date of the last git
  If the code is build from within a git tree, this is straightforward. On
  the other hand, the code may be build from  tarball, so we ensure that
  the lib/git-commit.h file is updated when the tarball is built, and
  included in the tarball.
* Add option to force building without libnl/libnl-3.
  This option is really only for test purposes to build keepalived
  without libnl even though libnl is installed.
* Log errors if configure IPVS with IPv6 if not using libnl.
  The socket interface for configurating IPVS does not support IPv6,
  so rather than leaving the user with the error message 
  "Operation not supported with specified address family" 
  give a meaningful message in the log.
  At configure time, a warning will also be generated stating that
  IPVS will not support IPv6.
* Ensure IPVS address families match.
  Don't allow a mixture of IPv4 and IPv6 addresses in a virtual server
  group, or within a virtual server. 
* When dumping an IPVS IPv6 address range, use hex.
* Log if virtual_server_group doesn't exists, or address family mismatch.
  If a virtual server is configured to use a virtual server group but that
  virtual server group doesn't exist, then log an error.
  Also, if the address family of the virtual server group and virtual server
  don't match, log an error as well.
  We really ought to be removing the virtual server from the configuration,
  but I haven't worked out how to do that yet.
* Don't flag changes to automake/conf generated files as source changes.
  The output of keepalived -v adds a '+' if there are uncommitted changes to
  the source code. However, we aren't interested in changes to the autoconf
  or automake generated files, since these aren't really "source" files, and
  are only included in the git repo to allow building on systems without 
  autoconf/automake. Further, the differences may simply be due to different
  versions of autotools being used.
* Minor formatting updates to Sphinx documentation.
* Enable configure to work with ash.
* Handle sysconf() returning -1 for _SC_GETPW_R_SIZE_MAX.
* Report ignoring virtual server if group specified doesn't exist.
  It's too difficult to remove the virtual server from the configuration,
  but the error will be reported in the log, and so the sysadmin should
  resolve the configuration.
* Updated snapcraft.yaml location.
* Move snapcraft and reflect master version.
* Add libipset3 to snap stage packages.
* Allow for keepalived to be a command in /snap/bin/ as well as a daemon. 
* Add 'source-type: git' to avoid dirty commit versions.
* Update gitignore for clean snap commit versions.
* Resolve not adding '+' to git version in snapcraft builds. 
  This is a temporary workaround to the problem of snapcraft deleting
  the snap/snapcraft.yaml file from its clone of the git repo (see for details).
* Add cleaning of snapcraft generated directories/files.
* Add support for Alpine Linux.
  This commit adds detection and support of the OpenRC init system. 
* Add details of what libraries are needed for various Linux distros.
* Force recreating automake/autoconf files when building with rpm.
  If an autoconf/automake source file is patched as part of the rpmbuild
  process, then some of the autoconf/automake generated files may be
  regenerated, and this can cause a mismatch if the versions of autoconf/
  automake on the system building the rpm don't match the versions
  that were used to generate the files that have been committed to git. 
  This patch changes the keepalived.spec file to always run autoreconf -f -i
  to ensure the generated autoconf/automake files are aligned to the right
Release 1.3.2
* Correctly handle return code from system() call.
  If we want to check for an exit status, WIFEXITED(ret) must be
  checked first.
* Fix compilation where SNMP enabled.
* Fix a couple of SNMP errors.
  The length of KEEPALIVED-MIB::version was being returned a sizeof(char *)
  rather than strlen(char *).
  VRRPv3 vrrpv3GlobalStatisticsDiscontinuityTime was being completely
* Add additional files needed to build from git without autoconf.
* Don't save and restore current directory twice with config includes.
* Don't recognise an executable file as a configuration file.
* Allow maximum path names for configuration files.
* Don't check for include file after reaching EOF.
* Fix a segfault if terminating at startup do to interface not found.
* notify: log error while performing set{gid,uid}.
  Log error message while setting goup and user before system call.
  Maybe we should avoid system call on error if {gid,uid} are used, would
  be more secure.
* Don't execute a script if setuid or setgid fails.
  This was suggested in the comment of commit 849615d and is clearly
  the right (secure) thing to do.
* If a script doesn't have a '/' in the name, search PATH for it.
  This also handles spaces in script specifications where they are
* Don't allow accept when strict mode set if not address owner.
  This commit changes keepalived from just issuing a warning to also
  disable accept mode when strict mode is set.
  Patch submitted by levin1.
* Added init_fail setting to assume failed state for vrrp_script during
  startup of keepalived.
* When checking script security check set uid/gid bits too.
  Although the setuid/gid bits are ignored for scripts, they are
  not ignored for binary executables, and there is no point in having
  the bits set for scripts. So we play safe, and simply check those
  bits, and don't attempt to ascertain if it is a script or not.
* Disable scripts that aren't executable.
  system() on a non-executable script will fail, so we may as well
  just not try executing such a script.
* Exit if can't read configuration file.
  If we have no configuration, we have nothing to run, so exit.
* Don't chdir("/") if not forking.
  In keepalived_main() there is a comment that the working directory
  is / unless keepalived is run in non-forked mode, in which case it
  remains the current working directory when keepalived was run.
  Unfortunately start_vrrp_child() and start_check_child() were
  executing chdir("/") regardless of whether they had been forked or not.
  Since the parent process does chdir("/") if it is appropriate, the
  children will inherit that, so they don't need to chdir() at all.
* Only set umask(0) in parent process.
  The children inherit it from the parent, so no need to set it in
  the vrrp or checker child processes.
* Further changes for script init state failed.
* notify: use _GNU_SOURCE.
  Just to make compiler happy about inconsitent declaration of mempcpy
  and strchrnul. Just cosmetics here.
Release 1.3.1
* Ensure lists aren't empty when checking script security.
* Correctly check security of scripts with parameters, and check
  checker notify/quorum scripts
* Check security of real/virtual server notify scripts.
* Handle space in filenames appropriately when checking script security.
  The generic notify scripts can have spaces in their filenames, all other
  scripts spaced delineate parameters.
Release 1.3.0
* Add DBus functionality to VRRP.
  Add new pthread off VRRP to expose DBus service org.keepalived.Vrrp1
  through a GMainLoop.
  Create a general /org/keepalived/Vrrp1/Vrrp DBus
  object and a /org/keepalived/Vrrp1/Instance/#interface#/#group# object for
  each VRRP instance.
  Interface org.keepalived.Vrrp1.Vrrp implements methods PrintData,
  PrintStats and signal VrrpStopped.
  Interface com.keepalived.Vrrp1.Instance implements method SendGarp
  (sends a single Gratuitous ARP from the given Instance),
  signal VrrpStatusChange, and properties Name and State (retrievable
  through calls to org.freedesktop.DBus.Properties.Get)
  Interface files are located at location /usr/share/dbus-1/interfaces/
  A policy file, which determines who has access to the service, is
  located at /etc/dbus-1/system.d/
* Resolve DBus working after a reload
  thread_destroy_list() was closing file descriptors of read and write
  threads, but we wanted the DBus pipes to remain open. It transpires that
  closing the fds in thread_destroy_list() is unnecessary, since they are
  closed elsewhere anyway, so stop closing the fds in thread_destroy_list().
* Add stronger compiler warnings (-Wextra).
  The following bugs were discovered:
        comparison if unsigned value <<> 0
    comparison of unsigned == -1 and not checking
    return status of find_rttables_scope() correctly
    accessing element buf[18446744073709551615]
    ie. buf[2^64-1], which is the same as buf[-1].
  The following improvements to the code were made:
  Many unused function parameters
  either removed or marked unused
  Many signed vs. unsigned comparisons
  In most cases variables change to be unsigned
  Lengths being stored in signed variables
* Rationalise checking of libnl-3.
* Bring generation of rpmbuild keepalived.spec file up to date
  The keepalived.spec file is now created to match the options passed
  to configure. It also detects if the system init process is systemd,
  upstart or the traditional SYSV init system.
* Add more BuildRequires to
* Further improvements to for systemd systems
* Change some variable names due to using PKG_PROG_PKG_CONFIG
* Fix to make RedHat hardened rpm builds work
  CFLAGS, CPPFLAGS and LIBS variables were not being preserved by, and this caused needed CFLAGS to be lost when
  configure was run, resulting in a build failure.
  This commit ensures the flags are all preserved.
* Allow for automake macro AM_PROG_AR not existing.
* Add support for UDP socket to layer4 library.
* Add DNS checker.
* Update documentation for DNS health checker.
* Fix compile check for PE selection support.
* Add file missing from add-dns-checker commit.
* Update commits for correctly checking for IPVS_SVC_ATTR_PE_NAME.
  The upadted configure and lib/ weren't included in the commits,
  and to be consistent the comment on what Linux version introduced the feature
  is in if the test exists in
* Fix conditional compilation test for FRA_OIFNAME.
* Fix compilation test for IFLA_INET6_ADDR_GEN_MODE.
* Fix compilation test for IPVS_DEST_ATTR_ADDR_FAMILY.
* Fix compilation test for IPVS_DEST_ATTR_STATS64 and IPVS_SVC_ATTR_STATS64.
* Fix compilation test for RTA_VIA.
* Fix compilation test for CLONE_NEWNET for DBus.
* Fix issue of overwriting the original disposition of signals.
* Improve forced termination of script execution process and its offspring.
* Improve propagate important signal for the script process groups.
* Use argument instead of static variable.
* Fix bug around the process group.
* Use SIGTERM instead of SIGHUP.
* Stop linking with -lipset.
  libipset (if used) is dynamically linked at runtime, and so keepalived
  shouldn't be linked with -lipset.
  Linking with -lipset was erroneously added when converting the build
  system to use automake.
* Report diagnostic message if dlopen() fails.
* Fix loading of ipset library when development library not installed.
* Don't use ipsets with namespaces on Linux <<> 3.13 by default.
  On Linux prior to version 3.13, ipsets were not network namespace
  aware, so by default the use if ipsets is disabled if keepalived
  is running in a network namespace. Configuration keyword
  'namespace_with_ipsets' enables ipset use with a network namespace
  on these older kernels.
* Fix reporting of script exit status.
* Update documentation and fix compiler warning re ipset with Linux <<> 3.13
* Make report_child_status() check for vrrp and checker child processes
  report_child_status() checks for exit status KEEPALIVED_EXIT_FATAL
  and KEEPALIVED_EXIT_CONFIG, but these are only relevant for the vrrp
  and checker child processes, and not for track scripts etc. This commit
  adds a check that the terminating process is the vrrp or checker process
  before checking those exit statuses.
* Add no_accept mode for VRRPv2 and standardise VRRPv3 with it
  RFC3768, for VRRPv2, specifies that packets addressed to the VIPs
  should not be accepted, unless the router is the address owner.
  This commit implements not accepting the packets when running VRRPv2,
  but only if no_accept is specified, or running in strict mode. The reason
  for not making no_accept the default (which would confirm to the RFCs) is
  that if running IPVS, or any other service on top of the VIPs, we need to
  be able to accept the packets, and requiring everyone to specify accept
  in that case would not be reasonable.
  Prior to this commit, VRRPv3 was blocking packets sent to VIPs (and eVIPS),
  unless the vrrp instance was the address owner, or accept mode was set. This
  commit changes the default behaviour for VRRPv3 to make it consistent with
  VRRPv2 (i.e. either strict mode or no_accept needs to be specified to be
  conformant with RFC5978).
* Tidy up logged messages if ipset initialisation fails.
* Streamline MII polling.
  We only need to read 2 MII registers, and not 32 as was previously being
  This commit also uses the <<>linux/mii.h<>> header file for field and
  register definitions.
* Simplify bitops.h code.
* Resolve warnings generated with compiler option -Dconversion.
  Most of the warnings were resolved by changing the data types of some
  variables. Others required casting, particularly where kernel interfaces
  are involved.
  There were a few instances discovered that were errors, for example comparing
  an unsigned int against -1, and assigning a 16 bit value to a uint8_t.
  This commit also adds configure options --enable-conversion-checks and
  --enable-force-conversion-checks, the former adds compiler option -Dconversion
  unless the compiler is an old version that throws up false warnings. Option
  --enable-force-conversion-checks adds -Dconversion even if the compiler throws
  up known false warnings.
* Fix some minor errors/typos in doc/keepalived.conf.SYNOPSIS.
* Fix keyword error in sample configuration.
* Fix typo in genhash error message.
* Fix address ranges for virtual server groups
  The handling of address ranges was only written for IPv4 addresses, and
  only worked on little endian systems.
  This commit enables IPv6 address ranges to work, and also should now
  work on big endian systems (but I don't have access to a big endian system
  to test it). Validation is added to ensure that the end of the range is after
  the start of the range, and that the value of the range end does not exceed
  255 (for IPv4) of ffff (for IPv6).
  There is also some optimisation of the code, so that netmask is not set (since
  it isn't used by the kernel), and the port is set once only, before the loop
  through the addresses.
* Add --enable-Werror configure option.
* Add promote_secondaries keyword for vrrp_instance block.
  If two IPv4 VIP addresses are in the same CIDR, and the primary
  address is removed, then by default any other address in the same CIDR is
  also removed. To stop this happening, the promote_secondaries flag
  needs to be set on the interface.
  Commit e5526cf added setting the promote_secondaries option on
  VMAC interfaces, and stated that adding the option for non-VMAC
  interfaces would be added later. This commit now adds a
  promote_secondaries configuration option in order to set the flag
  on the interface.
* Add reporting of promote_secondaries configuration setting.
* Add conditional configuration feature
  It is usually the case that the configurations for keepalived for
  systems operating together are virtually identical, and only differ
  in vrrp instance priorities, router id, and unicast addresses if
  those are being used.
  It is a nuisance to have to edit one file for each server to make
  identical changes, so this commit adds the facility for conditional
  configuration entries.
  Any line starting with the '@' character is a conditional line.
  Immediately following the '@' character is a config id. The line is
  only included in the configuration if the config id matches the
  argument passed to keepalived with the -i option on the command line.
  For example, consider the following configuration snippet:
    @main       router_id main_router
    @backup router_id backup_router
  If keepalived is started with -i main, then the router id will be
  main_router, if started with -i backup, then backup_router. If
  keepalived is started without the -i option, or -i anything else,
  then the above snippet will not configure any router id.
* Fix building with --disable-vrrp.
* Stop segfaulting when configuration keyword is missing its parameter
  There are many places where during configuration parsing the code
  assumes that if a keyword is specified that requires a parameter, then
  the parameter exists. If the parameter doesn't exist, then the code
  indexes past the end of the vector, and at best segfaults, and at worst
  may carry on, parsing random data.
  This commit adds strvec_slot() which checks for the presence of the
  parameter, and if configured will call a function that can handle the
  error. Currently this logs that the parameter is missing, with as much
  helpful information as it can provide, and then terminates.
* Use FMT_STR_VSLOT where appropriate.
* Use TIMER_HZ where appropriate.
* Fix comment and error message re http write timeout.
* More verbose logging on (effective) priorities pt. 2.
* Change configure option --enable-snmp-keepalived to --enable-snmp-vrrp
  The option was enabling snmp for vrrp, not all of keepalived (the
  --enable-snmp option does that), so this commit renames it to reflect
  what it is actually doing.
  The --enable-snmp-keepalived option is retained but marked as obsolete.
* Use AS_HELP_STRING autoconf macro.
* Fix process increase
* Add forcing termination of children of scripts if script times out
  Commits fe9638b..cebfbf5 resolved problems around forced termination
  of scripts if they didn't terminate within the proscribed time. During
  the development of the patches, it was identified that after a script
  had been terminated by SIGTERM, any child processes created by the
  script also need to be kill.
  This commit adds the forced termination of any such children.
* Correctly handle existing VMACs on reload.
  Anthony Dempsey in issue #449 identified that
  keepalived attempts to recreate existing VMAC interfaces on a reload,
  and that the subsequent failure causes keepalived not to use the VMAC.
  This then identified further issues such as the check for an existing
  VMAC in netlink_link_add_vmac() didn't also check the interface a
  VMAC was on, and that the checks for conflicts of VMAC interface names
  with existing interfaces weren't sufficient.
  This patch builds on the patch provided by Anthony Dempsey to also
  resolve the additional issues identified.
* Fix check of matching VRRP instances on reload.
  On a reload, clear_diff_vrrp() removes vrrp instances that are no
  longer in the configuration. The check, however, was based on vrrp
  instance name, which might have changed. The check is now based on
  VRID, address family and interface, since it is this triplet that
  uniquely defines a vrrp instance.
* Fix clearing addresses no longer used after a reload.
  The address comparison was including ifa_index, but that wasn't being
  set up until after clear_diff_vrrp() was called.
* Don't zero the mem_allocated count during reload.
  We want to know if there is a leak during reload, so don't zero the
* Ensure iptables/sets entries and ip routes/rules not lost on reload.
  There were several places in the code that were causing existing
  iptables/ipsets entries to be lost on reload, and also new entries
  for additional ip addresses were deleted after being added. In
  addition, ip rules/routes for existing entries were being removed.
* Ensure GARPs/GNAs are sent after reload if VIP/eVIP addresses added.
  Although there have been versions of keepalived when GARPs/GNAs were
  sent after a reload, this was due to a bug in determining if the VRRP
  instance had existed before. Resolving that bug (commit aaea8a4),
  caused keepalived to stop sending GARPs after a reload. This commit
  now specifically adds code to send GARPs on a VRRP instance for all
  addresses on that instance. It would be better if GARPs were sent only
  for the added addresses, and that may be resolved in a future commit.
* Use correct interface for iptables/ipset entries when not accept mode
  If an interface was specified for a VIP/eVIP, the iptables/ipset block
  if not in accept mode for link local IPV6 addresses was specifying the
  interface the vrrp instance was on rather than the interface the address
  was added to.
  This commit now makes the iptables/ipset entry specify the interface that
  the address has been added to.
* Resolve "Netlink: error: message truncated" messages.
  On systems with a page size larger than 4096 keepalived may report:
  "Netlink: error: message truncated" messages
  This error was reported on a ppc64le in an OpenStack/Nutron environment.
  Ppc64le is using a 64k pages size. I found that keepalived's netlink recvmsg
  buffer was too small causing messages to be truncated. The size of the read
  buffer for the netlink socket should be based on page size however, it should
  not exceed 8192. See the comment in the patch.
  I tested the fix by creating 100 veth interfaces and verifying the errors
  did not return.
* Use ipsets with namespaces on Linux <<> 3.13 if ipset names configured.
  The problem with using ipsets with namespaces on Linux <<> 3.13 is that
  ipsets were not namespace aware, and so all ipset entries added are
  global to the system, including all network namespaces. This causes
  problems if the default ipset names are used, but if set names have
  been specified, it is reasonable that they have been set to be
  different for each namespace, and hence there will be no clashes.
  The documentation is also updated for vrrp_ipsets keyword.
* Don't write MEM_CHECK data to log when forked script child terminates.
  The mem check log file was being filled with extraneous termination
  information every time a forked child terminated. When a child is forked
  it now sets a flag to stop the termination dump.
* Fix illegal syntax in configure script
  Indirect expansion (`${!foo}`) is a bashism, it's not POSIX-sh
  compatible and is not supported by common shells except Bash and ZSH!
  Configure script should be portable, hence strictly POSIX compliant.
  Moreover it has shebang /bin/sh.
* Make running scripts more secure
  Previously, keepalived ran all scripts as root. This is potentially
  dangerous if a non-root user can modify the script, or has write
  access to any part of the path to the script.
  This commit does the following:
  1) Adds configuration options to specify the user/group under which to
     run each script
  2) Adds an option to set the default script user/group. If this is not
     set it will default to user keepalived_script if that user exists,
     otherwise it will default to root, as before.
  3) If a script is to be executed with root privilege, report if it is
     writeable in any way by a non-root user.
  4) Add an option enable_script_security so that any scripts failing
  3) above won't be executed.
  5) Report if any scripts are not executable by the relevant user.
* Fix some lead tab/space issues.
* Fix segfault when terminating with no notify script configured.
* Fix compiler warning generated with --enable-conversion-checks.
* Don't segfault if modules ip_tables or ip6_tables not loaded
  If either of the modules is not loaded, then don't use ip(6)tables for
  that address family. We could load the module, but there would be no
  entries pointing to the chains that we use, and so there is no point
  adding entries to chains that won't be traversed.
* Resolve some type mismatch warnings on 32 bit systems.
* Fix checking security of misc_check scripts.
Release 1.2.24
* Declare and use default value for garp_refresh.
* Update documentation for default setting of snmp_server.
* Ensure old VIPs removed after reload.
* Add internet network control support for IPv6.
* Remove VIPs on reload if no longer in configuration.
* Add internet network control support for IPv6.
* Add more lvs syncd options, and various minor fixes.
* Don't attempt to set packet priority for wrong IP protocol.
  if_setsockopt_priority() was setting SO_PRIORITY socket option regardless
  fail for IPv6, it doesn't do anything.
  the setsockopt() call fails on an IPv4 socket.
  This commit makes keepalived only set the appropriate socket option, depending
  on whether it is an IPv4 or IPv6 socket.
  more specific IP_TOS option.
* Avoid compiler warning of duplicate definition.
* Add function attributes to malloc functions.
* KEEPALIVED-MIB vrrpRuleIndex should be unsigned.
  by ip rule).
* Make ip rules/routes a configuration option.
* Corrections for rule suppress_ifgroup.
* Stop respawning children repeatedly after permanent error.
  Keepalived was respawning very rapidly after a permanent error, which
  was not useful.
  This commit allows the detection of certain errors and if one occurs
  keepalived won't respawn the child processes, but will terminate with
  an error message.
  There was code remaining for supporting ip_vs for Linux 2.4, but
  the remainder of the keepalived code requires Linux >= 2.6.
* Make some libipvs functions static.
* Don't duplicate kernel definitions for IPVS code.
* Remove unused code from libipvs.c.
* Remove ip_vs_nl_policy.c, contents now in libipvs.c.
* Add ipvs 64 bit stats.
* Fix compiling without SNMP checker support.
  The patchset removing support for Linux 2.4 introduced a problem
  compiling libipvs.c when SNMP checker support wasn't enabled.
* Remove those annoying "unknown keyword" messages.
* Remove IP_VS_TEMPLATE_TIMEOUT. It was removed from ipvsadm in
  version 1.0.4.
* Remove check for MSG_TRUNC being defined.
  It has been defined since glibc 2.2.
* Remove conditionals based on libc5. libc5 predated glibc 2.0.
* Remove conditional compilation checks for defines in Linux 2.6.
  conditional compilation checks.
* Sort out checks for O_CLOEXEC.
* Remove check for SA_RESTART. It existed pre Linux 2.6.
* Change reporting of default snmp socket.
* Fix adding iptables entries on Linux 4.6.3 onwards.
  struct xt_entry_match. kernel commit 13631bfc6041 added validation
  that all offsets and sizes are sane, and the extra
  struct entry_match failed that test.
* Fix adding iptables entries on Linux 4.6.3 onwards.
* Fix size parameter for keepalived_malloc/realloc.
  lib/memory.h specified the size parameter to keepalived_malloc/realloc
  as size_t, whereas lib/memory.c specified unsigned long.
  Fix memory.c to make the parameter a size_t. 
  Use printf format specified %zu for size parameters.
* Fix building without LVS or without VRRP.
* Convert build system to automake.
  The INSTALL file gives instructions for setting up the build system
  using automake etc.
  For those without automake (and autoconf), just running configure
  works as before. 
* Convert build system to automake.
* Add network namespace support.
  This allows multiple instances of keepalived to be run on a single
  system. The instances can communicate with each other as though they
  are running in separate systems, but they are also isolated from
  each other for all other purposes.
  See keepalived/core/namespaces.c for some example configurations and
  use cases.
* Add network namespace support.
* Remove some superfluous conditional compilation tests.
* Poll for reflection netlink messages after adding each interface.
  If a large number of interfaces are added, the kernel reflection
  the kernel netlink reflection channel after adding each interface,
  thereby ensuring that a large queue of messages isn't built up.
* Fix debug build since automake conversion.
* Fix configuration testing for ipset support prior to Linux 3.4.
* Add polling of netlink messages when entering master state.
  If a large number of vrrp instances enter master state simultaneously
  isn't read sufficiently frequently. Adding a poll of the netlink socket
  when the become available.
* Fix generating git-commit.h.
* Ensure xmit_base not set with strict mode.
* Change true/false variables in global_data to bools.
* Fix timer_cmp handling large differences between the two times.
  differences were large.
* Add a TIMER_NEVER value.
  timed basis.
* Add global default_interface keyword.
  default_interfaces sets the default interface to use for static
  use a different interface for several static ipaddresses, this makes
  the configuration simpler. It also has the potential to reduces 
  changes required if transferring the configuration to another system. 
  impact that the backup instance would take over an hour to transition
  to master. 
* Don't set master_adver_int from an invalid packet. 
* Make timeout_persistence a uint32 rather than a string. 
* Fix some configuration tests and compiling on old Linux version.
* Improve persistence handling.
  Properly support persistence_granularity for IPv6.
  Set persistence_timeout default if granularity specified.
  Only support persistence engine if supported by the kernel.
  This commit also changes variables timeout_persistence and
  granularity_persistence to persistence_timeout and
* Simplify a bit of indentation.
* Free syslog_ident string after logging the free.
  freed after the log has been written to.
* Allow FREE_PTR mem check to log the proper function.
  is logged.
* Fix when some FREE() calls are made.
* Only parse net_namespace in parent process.
* Add VRRP/LVS conditional compilation around PID files.
* Improve removing zombie PID files.
* Add more VRRP/LVS conditional compilation.
  keepalived was calling sysctl to check if the interface was configured as
  router before sending each gratuitous Neighbour Discovery advertisement. This
  master, and uses that for all the NA messages.
* Improve mem check initialisation.
* Add support for running multiple instances of keepalived.
  Using network namespaces allows multiple instances of keepalived to run
  concurrently, in different namespaces, without any collision of the pid
  in the same namespace without pid file name collisions.
* Add configure option to enable stacktrace support.
* Fix adding and deleting iptables rules for addresses.
  When keepalived was built not using ipsets, the adding and deleting
  of rules for addresses was including an extra xt_entry_match struct
  that meant that the rules could only be deleted by ithe iptables
  command by entry number and not be specifying the parameters.
* Fix compiling without libiptc (iptables) support.
  At startup keepalived attempts to remove any iptables configuration that
  write_stacktrace a configure option.
* Add script to setup interfaces in a network namespace.
  The scripts mirrors the running network interfaces that are needed
  for a given keepalived configuration into a network namespace
  order to test the configuration.
* Correct comments re location of network namespace pid files.
* Add -s option for overriding net_namespace configuration option.
* Change test/ -c option to -f to match keepalived.
* Make report interfaces that don't exist.
* Remove leftover debug message.
* Fix address comparison for equal priority adverts.
* Streamline the specification of libraries to the linker.
  Most of the dynamic libraries and static libraries were being specified
  and only duplicates core/libcore.a of the static libraries.
* Fix automake files for building on Ubuntu 14.04 LTS.
* Enable building with Net-SNMP on Ubuntu.
* Stop compiler warning on Ubuntu.
* Fix compilation with libipset on Debian wheezy.
* Fix various build problems on Ubuntu 14.04 and Debian.
Release 1.2.23
* Make malloc/free diagnostics a separate configure option. 
  The commit adds the configure --enable-mem-check option which
  allows the MALLOC/FREE diagnostics to be enabled without 
  the --enable-debug option. This means that the mem-check
  diagnostics can be used when running keepalived in it's normal mode
  with forking children for vrrp and checkers.
  The mem-check diagnostics are written to
  The --mem-check-log configure option enables command line option
  -L which also writes zalloc/free details to the syslog. 
* Fix compilation error on 32-bit systems with mem-check enabled.
* Replace one zalloc() and one free() call with MALLOC() and FREE(). 
  This ensures that the mem-check diagnostics cover all mallocs/frees.
*  Fix report of malloc'd memory not being freed.
* Streamline read_line().
* Resolve a segfault when reloading with vmacs.
  The vrrp_t entries on the vrrp_data list have pointers to an
  interface_t for each vrrp instance. When reloading, the
  interface_t items where freed, but a pointer to the old list
  of vrrp_t items is held in old_vrrp_data. After the new 
  configuration is processed, clear_diff_vrrp() is called. clear_diff_vrrp()
  uses the interface_t pointers from the old vrrp_t entries, but the 
  memory pointed to by the interface_t pointers has already been freed,
  and probably reallocated for a different use.
  This commit delays freeing the old interface_t items until after
  clear_diff_vrrp() has completed, so the interface_t pointers remain valid.
* Check valid interface pointer before calling reset_interface_parameters().
  Before resetting the settings on the base interface of a vmac, check that
  the interface_t pointer is valid.
* Fix new --mem-check-log option. 
* Don't write parent's memory logging into children's log file.
  When running with mem-check output to files, the buffer from the
  parent process was also being written into the children's log
  files. The commit sets the CLOEXEC flag on the log files, and
  also sets the log files to be line buffered.
* Fix segfault or infinite loop in thread_child_handler() after reloading.
  When the checker and vrrp child processes start up, memory for a
  thread_master_t is malloc'd and saved in master. Subsequently,
  launch_scheduler() is called, and that sets the parameter to be passed
  to the SIGCHLD handler - thread_child_handler() to the value of master, 
  pointing to a thread_master_t.
  If keepalived is signalled to reload, the child processes free all
  malloc'd memory, and a new thread_master_t is malloc'd and saved in
  master. If this is not the same address as the previous thread_master_t,
  then the value being passed to the SIGCHLD handler is a pointer to the
  old thread_master_t, whereas everything else is using the new thread_master_t.
  If the memory used for the old thread_master_t is then returned in a subsequent
  malloc() call, a subsequent SIGCHLD will invoke thread_child_handler() with
  a pointer to memory that has now been overwritten for some other purpose, hence
  causing either a segfault or an infinite loop.
  A further consequence is that new child processes will be added to the new 
  thread_master_t, but when thread_child_hander() is called after a child 
  terminates, it won't find the child since it is still looking at the old 
  This commit modifies the behaviour of a reload by not releasing the old 
  thread_master_t and then malloc'ing a new one, but rather it just reinitialises
  the original thread_master_t and continues using it.
* Remove base_iface from struct _vrrp_ - it wasn't used.
* Add configuration option to flush LVS configuration.
  This commit adds a global configuration option lvs_flush to flush
  the LVS configuration, and if not set, the configuration won't be
* Add back real server when return from failure with HTTP_CHECK.
  If status_code wasn't specified for a url entry in the configuration
  then a real server would never be returned to service following a
  The commit makes keepalived return a real server to service if no
  status_code is specified if the HTTP status code returned from the
  service is a success code (i.e. 2xx).
* Avoid duplication of keyword installation in check_http.c.
* Fix adding new static ip addresses after reload. 
  Commit f23ab52, when stopping duplicate static ip routes and rules
  being added after a reload also stopped new static ip addresses being
  added. The commit reinstates adding new static ip addresses.
* Fix adding static iprule/routes after a reload. 
* Stop segfault when configure a route with no destination address.
* Fix unused global vrrp_garp_master_refresh.
* fix healthchecker reload when some healthchecks are failed. 
Release 1.2.22
* vrrp: Fix build without VRRP VMAC.
* Fix compilation with RFC SNMP without Keepalived SNMP.
* vrrp: Update master_adver_int when receive higher priority advert
  when master.
  If VRRPv3 is being used, and a higher priority advert is received when
  in master mode, the master_adver_int needs to be updated when transitioning
  backup mode. If this isn't done, and our advert interval is less than a third
  of the new masters, we will time out and re-enter master mode, send an advert
  to which the other master will resond with a higher priority advert, causing
  us to go back into backup mode, until our timer expires again, and this will
  continue indefinitely.
* vrrp: Don't send advert after receiving higher priority advert.
  If a master receives a higher priority advert, there is no need
  to send another advert, since the sender of the higher priority
  advert is already a master. Further, any other instance in backup
  mode will process our subsequent advert, and then consider the
  wrong system to be master, until it receives another advert from
  the real master.
  With VRRPv3, if the other master has an advert interval more than
  three times our advert interval, backup routers will be using our
  advert interval after we've sent our subsequent advert, and will
  then timeout before the new master sends another advert, prompting
  (one of) the backup routers to become a master, which will prompt
  the higher priority master to send an advert, the ex-backup router
  will then send another advert and we could end up in an endless cycle.
* vrrp: Fix receiving advert from address owner when in fault state.
* vrrp: When transitioning from fault state, log state change.
* vrrp: Fix preempt delay when transitioning from fault state.
  There were two ways of leaving fault state, either by receiving a packet
  on the instance, or by a netlink message indication that the interface is
  up again. In neither case was preempt_delay considered in the code.
  This commit changes the way vrrp->preempt_time is used. preempt_time is now
  only used once a higher priority advert is received, rather than being updated
  every time a lower priority advert is received. vrrp->preempt_time is now also
  set when transitioning out of fault state. vrrp->preempt_time.tv_sec == 0 now
  indicates the timer is not running.
* vrrp: Detect and report duplicate address owners.
  If more than one system is configured as an address owner (priority
  == 255), this would be a configuration error, and could cause
  unexpected behaviour. This commit ensures that the problem is
  reported, and sets the local instance not to be the addess owner,
  as a temporary workaround for the problem.
* vrrp: Fix maximum number of VIPs allowe.
* ipvs: Fix IPVS with IPv6 addresses.
* ipvs: Don't overwrite errno by another syscall before checking errno.
* ipvs: ipvswrapper.c: fix comparison.
* Enable compilation with development net-snmp headers.
* vrrp: Fix IPv4 vIP removal when addr matches pre-existing interface addr.
  For IPv4 vIPs keepalived adds a /32 to the underlying interface. If
  this address matches an address already configured, e.g. a /24, when
  this vIP is eventually removed due to a configuration change or
  keepalived shutdown, the original address matching the vIP, outside
  of keepalived's control, is removed instead. This behaviour is
  incorrect. The /32 added by keepalived should be the address being
  removed. Keepalived should not be touching any addresses it does not
* vrrp: Check for errors when opening VRRP data and stats files.
  This fixes crashes when running keepalived under SELinux enforcing mode,
  which does not allow keepalived proccess to write to /tmp by default.
* vrrp: Don't assume IPADDRESS_DEL == 0 and IPADDRESS_ADD != 0.
* vrrp: Fix compilation failure.
* vrrp: Fix transition to backup when receive equal priority advert from
  higher address.
  When a vrrp instance in master mode received an advert from another master
  that had equal priority, it wasn't comparing the addresses to determine
  whether it should treat the advert as higher priority, and hence the
  instance should fall back into backup state.
  When checking whether the advert is from a lower priority master, it now
  checks if the priorities are equal and then compares the addresses.
* vrrp: Optimise address comparision when receive advert in master mode.
* Optimise inet_inaddr_cmp.
Release 1.2.21
* Install VRRP-MIB when applicable.
  It appears that the condition in for installing VRRP-MIB
  was using a non-existent macro, SNMP_RFC2_SUPPORT. This patch removes
  two conditions from that use undefined macros and adds a
  condition to install VRRP-MIB when SNMP_RFCV2_SUPPORT is set
* Check virtual route has an interface before returning ifindex to SNMP
* Force git-commit.h to be updated when needed
* INSTALL: Keepalived doesn't need popt anymore
* INSTALL: support for 2.2 kernels is long gone.
* INSTALL: fix a few typos
* keepalived.conf(5) some minor improvements
* man keepalived(8): some minor improvements
* Add printing of smtp server port when printing global config
* timeout_epilog: mark argument const.
* parser: mark some function arguments as const.
* terminate argv with NULL.
  man execvp says: "The array of pointers must be terminated by a null
* ipvswrapper.c: fix comparison.
* mark pidfile strings as const.
* utils.c: mark some arguments a const.
  I left inet_stosockaddr alone for now, since it modifies the string.
  We should fix that, since we pass in strings which might be const and in
  readonly memory.
* netlink_scope_n2a: mark return type as const.
* vector->allocated is unsigned.
* notify_script_exec: mark a few arguments as const.
* vscript_print: mark string as const.
* vector->allocted is unsigned.
* dump_vscript: mark str as const.
* Updated range for virtual_router_id and priority.
* Stop segfaulting with mixed IPv4/IPv6 configuration
  After reporting that an ip address was of the wrong family, when
  the invalid address was removed from the configuration, keepalived
  was segfaulting, which was due to the wrong address being passed to
* Updated range for virtual_router_id and priority in
* Allow '-' characters in smtp_server hostname.
* Allow smtp_server domain names with '-' characters to be parsed
* Report and exit if configuration file(s) not found/readable.
  The configuration file is treated as a pattern, and processed
  using glob(). If there is no matching file, then it wasn't reading
  any file, and keepalived was running with no configuration.
  This patch adds a specific check that there is at least one matching
  file, and also checks that all the configuration files are readable,
  otherwise it reports an error and terminates.
* Fix building with Linux < 3.4 when ipset development libraries
  Prior to Linux 3.4 the ipset header files could not be included in
  userspace. This patch adds checking that the ipset headers files can
  be included, otherwise it disables using ipsets.
* configure: fix macvlan detection with musl libc.
* Fix compiling without macvlan support.
* Bind read sockets to particular interface.
  Otherwise, since we use RAW sockets, we will receive IPPROTO_VRRP
  packets that come in on any interface.
* vrrp: read_to() -> read_timeout(). Make function name less confusing.
* vrrp: open_vrrp_socket() -> open_vrrp_read_socket().
  An equivalent open_vrrp_send_socket() exists, therefore make
  the read version follow the same naming convention.
* vrrp: fix uninitialized input parameter to setsockopt().
* Make most functions in vrrp_print.c static.
* Enable compilation on Linux 4.5.x.
  Including  causes a compilation failure on Linux 4.5
  due to both  and  being included, and they have
  a namespace collision.
  As a workaround, this commit defines _LINUX_IF_H before including
  , to stop  being included. Ugly, yes,
  but without editting kernel header files I can't see any other way
  of resolving the problem.
* Fix segmentation fault when no VIPs configured.
  When checking the VIPs in a received packet, it wasn't correctly
  handling the situation when there were no VIPs configured on the
  VRRP instance.
* Improve checking of existance and readability of config files.
  There was no check of the return value from glob() in read_conf_file()
  and check_conf_file(), so that if there were no matching files, they
  attempted to use the uninitialised globbuf, with globbuf.gl_pathc taking
  a random value. A further check has been added that the files returned
  are regular files.
  Finally, if no config file name is specified check_conf_file() is now
  passed the default config file name rather than null.
* vrrp: update struct msghdr.
  The vrrp netlink code assumes an order for the members of struct msghdr.
  This breaks recvmsg and sendmsg with musl libc on mips64. Fix this by
  using designated initializers instead.
* Initialise structures by field names.
* Detection of priority == 0 seems to be shaded.
* More verbose logging on (effective) priorities.
* Log changes to effective priority made via SNMP.
* vrrp: use proper interface index while handling routes.
  It appears current code has a small typos while handling routes trying
  to access route->oif where it should be route->index.
* vrrp: make vrrp_set_effective_priority() accessible from snmp code.
  just include proper file in order to avoid compilation error.
* monotonic_gettimeofday: make static.
* Disable unused extract_content_length function.
* utils: disable more unused functions.
* utils: make inet_sockaddrtos2 static.
* signal: remove unused functions.
* Disable unused signal_ending() consistently with other unused code.
* parser: make a bunch of stuff static.
* scheduler: make a bunch of stuff static.
* scheduler: disable unused thread_cancel_event().
* vector: disable unused functions.
* vector: make 2 functions static.
* list: disable unused function.
* genhash: make some functions static.
* Remove unused variable.
* core: make a few functions static.
* checkers: make some functions static.
* vrrp_arp: make some global variables file-scope.
* vrrp_ndisk.c: make 2 global variables file-scope.
* vrrp: make some functions and globals static.
* In get_modprobe(), close file descriptor if MALLOC fails.
  The sequencing of the code wasn't quite right, and so if the MALLOC
  had failed, the file descriptor would be left open.
* Fix compilation without SOCK_CLOEXEC and SOCK_NONBLOCK.
  SOCK_CLOEXEC and SOCK_NONBLOCK weren't introduced until
  Linux 2.6.23, so for earlier kernels explicitly call fcntl().
* Don't include FIB rule/route support if kernel doesn't support it.
* Enable genhash to build without SOCK_CLOEXEC.
* Ignore O_CLOEXEC if not defined when opening and immediately closing file.
* Allow building without --disable-fwmark if SO_MARK not defined.
  configure complained "No SO_MARK declaration in headers" if that
  was the case, but --disable-fwmark was not specified. The commit
  stops the error message, and just defines _WITHOUT_SO_MARK_ if
  SO_MARK is not defined.
* Update documentation for debug option.
* Add options -m and -M for producing core dumps.
  Many systems won't produce core dumps by default. The -m option
  sets the hard and soft RLIMIT_CORE values to unlimited, thereby
  allowing core dumps to be produced.
  Some systems set /proc/sys/kernel/core_pattern so that a core file
  is not produced, but the core image is passed to another process.
  The -M option overrides this so that a core file is produced, and
  it restores the previous setting on termination of the parent process,
  unless it was the parent process that abnormally terminated.
* Add option to specify port of smtp_-server.
* Add comment re when linux/if.h and net/if.h issue resolved upstream.
* Enable building with SNMP with FIB routing support.
* Exclude extraneous code when building with --disable-lvs.
* Update description of location of core files.
* Add support for throttling gratuitous ARPs and NAs.
  The commit supersedes pull request #111, and extends its functionality
  to also allow throttling of gratuitous NA messages (IPv6), and allows
  specifying the delay parameters per interface, since interfaces from
  the host may be connected to different switches, which require
  different throttling rates.
* Add snmpServerPort to Keepalived MIB.
* Add printing of smtp server port when printing global config.
* Add aggregation of interfaces for throttling ARPs/NAs.
  This commit adds support for aggregating interfaces together, so
  that if multiple interfaces are connected to the same physical switch
  and the switch is limited as a whole on the rate of gratuitous ARPs/
  unsolicited NAs it can process, the interfaces can be grouped together
  so that the limit specified is applied across them as a whole.
* In free_interface_queue, don't check LIST_ISEMPTY before freeing.
* Clear pointer freed by free_list().
* Make FREE_PTR() clear the pointer after freeing the memory.
* Make FREE() clear pointer after memory released.
  Since a pointer to allocated memory mustn't be used after the memory is
  freed, it is safer to clear the pointer. It also means that if the pointer
  is subsequently used, it shoud segfault immediately rather than potentially
  trampling over random memory, which might be very difficult to debug.
* vrrp: Improve validation of advert_int.
Release 1.2.20
* better VERSION handling
* ipvs: tcp check supports retry.
  New tcp check config option "retry" sets the check retry counter.
  If tcp check fails on an alive server, keepalived will perform
  another checks until n_retry counter reaches zero, or until the check
  succeeds. The delay between retry checks is configured by the
  "delay_before_retry" config option. The default value is 1 retry after 1 second.
  This is the same feature that already exists in HTTP checker
  (config option "nb_get_retry").
* check_http: retry logic is refined.
  Retry on every error, including timeout and connection
  error, but only when RS is up.
  This is needed to reduce rs flaps: we shut the server down
  only after nb_get_retry failed checks.
  Also, do not wait for delay_loop after a successfull check to
  bring the server UP.
* ipvs: respect the error code of the ipvs_talk.
  Previously, if the IPVS reflector was unable to perform
  its task, it reported error through syslog and ignored it.
  This behavior leads to inconsistancies with quorum-handler:
  it is called with UP even if no RS were added into the IPVS.
  This could take place, for example, when there is a limit of
  opened filehandles and keepalived was unable to open netlink
  socket (it is opened on every call to the ipvs_talk).
  Now the check is not marked as OK unless IPVS reflector reports
  OK. Following successfull check will try to add an RS again.
  The special case errors "ENOENT on remove" and "EEXIST on add"
  are treated with OK result code.
* ipvs: remove unused resulting error code.
  These functions are turned from int into void:
  ipvs_group_sync_entry, ipvs_group_remove_entry, ipvs_syncd_cmd.
* check_http: reduce cpu usage.
  do MD5 calculation only when configured to do so.
* timer: reduce cpu usage.
  timer_cmp is called too often and eats much of cpu cycles. Make
  the comparison more effective. Increase code re-using in
  monotonic_gettimeofday(). Use timer_reset_lazy() where possible
  to omit the excess memset() call.
* scheduler: reduce CPU usage.
  Since threads are sorted by t->sands, we could break the cycle
  when not expired thread found.
* ipvs: rs weight changes properly on reload.
  Do not remove and re-add a real_server when reloading config
  if its weight has changed. Just edit the existing ipvs rs entry.
* ipvs: new service option "ip_family".
  This option explicitly specifies the address family of a
  fwmark IPVS service entry. Previously it was determined by
  the AF of the first real server. This logic is kept as a fallback
  when the "ip_family" option is missing.
  Also, now it is possible to create two different services
  for v4 and v6 with the same fwmark number.
* make 'smtp_server' config to support domain name.
* use getaddrinfo() instread of gethostbyname().
* make 'smtp_server' config to support domain name.
* Added vrrp 'timeout' to synopsis.
* Cleaned/fixed up KEEPALIVED-MIB, it now passes smilint
* Fixed vrrp_snmp_route() - it was returning the address of the pointer
  instead of the IP address / network address for dst, gw, gw2, and src
* SNMP fixes/cleanup.
* Added support for static and virtual ip rules for use with policy
  based routing
* Add info to set a default gateway into man and sample.
* vrrp: Fix socket setup code for IPv4 multicast.
  if_setsockopt_mcast_if was only doing anything for IPv6 interfaces.
  Make it work also for IPv4 interfaces, and then don't need to
  call if_setsockopt_bindtodevice for multicast.
  Is it still necessary to call it for unicast?
* vrrp: Set (and restore) interface parameters.
  In order to receive and send multicasts on the correct interfaces
  various parameters need to be set via the /proc/sys/net/ipv4/conf
  interface. This patch sets them as needed, and restores any
  changes on the underlying interface on exit.
  If a user currently sets any parameters by scripts, that will
  override these changes and still work, but this change in general
  will make it unnecessary to change any parameters with scripts.
* vrrp: Leave VRRP multicast group by ifindex.
  Since we know the interface index, use that instead of the address
  since it is more efficient. Also, in the unlikely event that the
  interface doesn't have an address, then this avoids a problem.
* vrrp: Don't delete vmac interfaces before dropping multicast membership.
  Further to commit afea07bd94384c8ac8125e8cdbfd18bc4a46b14e, the
  dropping multicast memberships were failing, since the vmac
  interfaces had already been deleted. This patch keeps the vmac
  interfaces until after the IP_DROP_MEMBERSHIP ioctls. Separating
  the sending of the VRRP priority 0 messages from the shutdown
  of the vrrp instances is necessary since vrrp_dispatcher_release
  closes the sockets that are needed for sending the messages.
* vrrp: Don't open vrrp_send_socket if address family is wrong.
  open_vrrp_send_socket was opening a socket, and then checking that
  the address family was valid. Checking that the address family is
  valid at the beginning of the function streamlines the code.
* vrrp: Stop m'cast packets being queued (and not received) on send socket.
  If there are other vrrp instances on the same network, their
  multicast packets are queued to our vrrp send socket, but since we
  don't receive on that socket, the messages just get queued in the
  kernel (run netstat -anp | grep keepalived to see the queued
  packets increasing).
  This patch clears the IP_MULTICAST_ALL option, to stop these
  packets being queued.
* vrrp: Fix typos in log messages.
* vrrp: Fix RFC reference.
* vrrp: Fix vrrp parser error message.
* vrrp: Add interface index to vrrp dump data.
* vrrp: Don't specify source address in IP_ADD_MEMBERSHIP ioctl.
  If ifindex is specified, any source address given is ignored.
* vrrp: If fail to remove vmac i/f, don't report success after fail message.
* Help vim's formatting to work in
  The single "'" in a comment confuses vim, and the screen formatting
  gets confused. Adding a second "'" in a C comment sorts vim out.
* vrrp: Don't explicitly drop IGMP membership before interface deletion.
  The kernel will send IGMP leave group messages when an interface
  is deleted, so there is no need for us to do so. Experimentation
  has shown that explicity doing IGMP_DROP_MEMBERSHIP doesn't make
  it any more likely the IGMP leave group messages will be sent.
  Adding the 1 second sleep significantly increases the likelihood
  of the IGMP messages being sent, but is doesn't guarantee it.
  Extending the sleep time doesn't improve the chances.
* Fix compiler warnings.
* vrrp: Add info to set a default gateway into man and sample.
* vrrp: Don't report error on interface creation/deletion.
  netlink_reflect_filter was returning an error if it didn't already
  know about an interface that has just been created. If we don't
  know about the interface, simply ignore it. Likewise on interface
  deletion, if we don't know about the interface, ignore it.
* vrrp: Ensure the first interface's parameters are set when using libnl3.
  Patch 60217b63242bee37b1c97a04644be6eb5e18b4c4 sets the interface
  parameters for each interface, but when using libnl3 there was a
  conflict with libnl, causing the parameters not to be set for the
  first interface. This patch makes vrrp_netlink.c use libnl3 if it
  is available, to avoid the conflict.
* vrrp: Fix interface parameter setting with libnl3 and error message on
  interface creation/deletion
* vrrp: Allow gratuitious ARP parameters to be configured globally.
  It is likely that the gratuitions ARP parameters will want to be
  the same for all interfaces, so allow the defaults to be set
  globally. Also allow vrrp_garp_delay to be set to 0 to indicate not to
  send further garp messages after a delay (to emulate how the
  kernel sends gratuitous ARPs).
* ipvs: Remove nat_mask configuration parameter.
  nat_mask was only valid with 2.2 kernel, and the implementation of
  it was removed in patch d51194f... but some of the configuration
  code remained. This patch removes all remaining code relating to
* Update man pages. keepalived.conf.5 is updated to include all
  configuration parameters, and keepalived.8 is updated to document the
  signals that can be used with keepalived.
* Remove remaining 2.2 kernel code.
* vrrp: Allow specification of default VRRP version to use.
  Rather than have to specify using VRRP version 3 on each VRRP
  instance, allow global configuration to set the default version.
* vrrp: Remove use of deprecated nl_join_groups().
  The use of nl_join_groups was introduced in commit 84cf733.. in
  order to resolve quickly a problem introduced in an earlier patch.
  This patch follows the approach adopted by libnl3, which uses a
  list of groups, rather than a bitmap which is limited to 32 groups.
* Documentation updates, removal of redundant code, global config.
* vrrp: set router flag in neighbour advertisements.
  This is necessary in order to prevent the IPv6 stack on a node that
  receives the unsolicited and overriding neighbour advertisement for the
  VIP (that gets sent automatically when Keepalived transitions to MASTER
  state) from immediately removing the VIP from its list of default
  routers. See for an example of
  the problems this can cause.
  Note that the approach in this patch simply unconditionally sets the
  router flag. That is better than having it unconditionally unset (VRRP
  stands for Virtual *Router* Redundancy Protocol, after all), but it
  might not be appropriate whenever VRRP is used to fail over addresses
  that are used for other tasks than being routers. Thus it might be
  better to read in the interface's "forwarding" sysctl and set the router
  flag accordingly, or making the value of the router flag configurable in
* vrrp: Dynamic addition of interfaces from netlink msg.
  When a tracked interface is deleted then recreated with the same config
  VRRP groups tracking this interface will remain down. This is due to
  tracking of stale information.
  This patch listens for netlink messages for the creation of interfaces
  and does one of two things.
  i) If the interface doesn't exist in the vrrp interface list a new
  interface structure is created and the information from the message is
  used to fill the structure. This new interface is then added to the
  interface queue.
  ii) If the interface already exists in the queue we zero it and then
  use the information in the message to fill the structure.
* branch to fix empty RS list issue.
* a fix for services with no RS.
* check: segfault when there is no real server for a virtual server.
* vrrp: Stop memory leak rename function for convention.
  Renamed netlink_populate_intf_struct to netlink_if_link_populate to fit
  with file naming scheme.
  It was possible that a created ifp structure would not be cleaned up if
  netlink_if_link_populate returned a -1, fixed this so the structure is
* Make parent process handle and propagate USR1/2 signals.
  In order to be able to automate writing configuration and/or stats
  the signals USR1 and USR2 need to be able to be sent to the parent
  process since its pid can be read from /var/run/
  The parent then needs to propagate these signals to a vrrp child.
* Ignore all signals except those explicitly wanted.
  In order to harden keepalived against a user accidentally sending
  a wrong signal to keepalived, set all signals other than those we
  want actioned to be ignored.
* Remove potential race condition when setting signal handlers.
  There was the potential for signal_run_callback to be invoked
  after calling sigaction for a signal, prior to the internal signal
  handler signal_SIG***_handler and signal_SIG***_v variables being
  set up. To remove the race condition, when setting a signal handler
  block the signal until the internal handlers have been fully set up.
* Make signal_ignore mean ignore.
  signal_ignore was setting a signal handler for the signal, but
  then itaking no action when the signal was received. This is now
  changed so the signal is actually set to be ignored.
* Streamline signal handling code.
  There was some duplication of the code for signal handling, and
  this slight restructuring avoids the duplication and makes it
* vrrp: Invoke notify scripts with the default signal disposition.
  It is reasonable for notify scripts to expect to be invoked with
  the standard signal disposition, so when first setting up signal
  dispositions, remember the original state so it can be restored
  before the notify scripts are exec'd.
* Return address of previous signal handler according to SA_SIGINFO.
  The man page for sigaction(2) states that SA_SIGINFO is only
  meaningful when establishing a signal handler. This appears not
  to be the case, since the flag will be set in the oldact structure
  on return from sigaction if the previous signal handler was
  established using the SA_SIGINFO flag.
* Invoke all scripts with the default signal disposition.
  Just as the change for notify scripts, it should apply to other
  scripts as well.
* vrrp: Don't wait on script process being killed after timeout.
  The child_timout_thread functions send a SIGKILL to a child
  process that has timed out and didn't die quickly enough
  after sending a SIGTERM. They then wait on the process dying.
  The main problem is that if the waitpid is successful here, then
  waitpid in thread_child_handler will never be successful for the
  same pid, and so the entry on the child list will never be removed
  and the parent thread will not be marked as ready.
  There is also a theoretical possibility that the child process is
  unkillable, and so the waitpid would hang forever.
* Set thread conditions before adding to list.
  It seems safer to set the status and type of a thread before
  adding it to the ready list.
* Remove some code duplication re running scripts.
  misc_check_thread and vrrp_script_thread were virtually identical
  so move duplicate code into new function system_call_script in
* Fix formating of man page.
* Set standard signal disposition before invoking ip(6)tables.
  Call signal_handler_notify before running iptables/ip6tables.
  Since it is now called for more than notify scripts, rename
  signal_handler_notify to signal_handler_script
* Move common code for opening fd 0/1/2 into a function.
  The code for setting fd 0/1/2 to /dev/null before running a script
  was in several places. All the common code is moved into a function
  and the function called from the relevant places.
  It is only necessary to reopen fd 0/1/2 if keepalived is running
  with the --dont-fork option, since without that option the fds are
  already open on /dev/null.
* Optimise closure of fds before invoking scripts.
  Every time before a script was invoked, closeall() was called,
  which would spin through 1024 file descriptors closing them, even
  though the vast majority were not open, resulting in 1024 system
  calls. To avoid that, open all sockets and file descriptors
  (except fd 0/1/2) with the CLOEXEC flag set, so that the fds will
  be closed by the kernel when the script is exec'd.
* Simplify some IPv4/IPv6 code.
  Code blocks were (unnecessarily) repeated in functions which
  handled both IPv4 and IPv6 situations.
* Fix reloading and invoking notify scripts.
* Update vrrp_scheduler.c.
* Converted pdf user guide to RST with Sphinx.
* Added check for libnfnetlink header during the configure step.
* In free_list_elements invoke the free function if it exists.
* Use of LIST_ISEMPTY to check list exists causes memory leak.
* Stop parse_ipaddress FREEing via pointer passed to it.
  parse_ipaddress FREE'd new following an error, but new could be an
  address passed to the function, and therefore might not be MALLOC'd
  memory.  This commit makes the caller of parse_ipaddress free the
  memory if there is an error and the calling function MALLOC'd the
* vrrp: Add vrrp_iptables global configuration option.
  The iptables/ip6tables entries were always added at the end of the
  INPUT chain, but for many configurations this is too late in the
  processing. This patch allows the chain name to which rules are
  added to be specified, and also allows the option of specifying
  no rules are to be added.
  If a chain name is specifed, it is necessary for that chain to
  already exist in the iptables and/or ip6tables config, and for
  that chain to be called from an appropriate point in the
  ip(6)tables configuration.
* vrrp: Add option to block outbound traffic from VIPs.
  Unwanted traffic to VIPs is discarded by ip(6)tables. This adds
  an option to also block outgoing traffic from VIPs.
* vrrp: Add iptables blocks for E-VIPs just like VIPs.
* vrrp: Allow unicast IPv6 Neighbour Solicits to be received.
  An ip6tables rule is added to allow IPv6 NAs to be received, but
  we also need to be able to receive NSs to respond to neighbours
  attempting to verify our reachability.
* vrrp: Use correct MAC address for IPv6 VRRP packets.
  The IPv6 VRRP packets were using the MAC address of the underlying
  interface, rather than the MAC address of the vmac. This commit sets
  the correct MAC address for IPv6, and also adds the link-local address
  of the underlying interface to the vmac interface, so that VRRP
  packets can be sent from the vmac interface, thereby using the VRRP
  MAC address.
* vrrp: Disable IPv6 on IPv4 VRRP VMAC interfaces.
  If IPv6 is not disabled on VMAC interfaces, an IPv6 link local
  address is generated based on the virtual MAC address. This is not
  only contrary to RFC 5798 para 7.4, but also causes duplicate
  address detection failure. The address also just isn't needed!
* vrrp: Fix setting nlmsg_len for netlink messages.
  For netlink messages, nlmsg_len must always be set to an aligned
  length. Prior to this commit, nlmsg_len was only being aligned when
  a subsequent attribute was added to the list. This was fine if the
  length of the last attribute added was an aligned length (which had
  always the case), but didn't work if the last attribute added didn't
  have an aligned length.
  This patch is needed in preparation for adding an attribute which
  doesn't have an aligned length.
* vrrp: Stop having an IPv6 link-local address added based on VMAC mac
  IPv6 link-local addresses that were based on the virtual MAC address of
  the VMAC interface were being added. RFC5798 para 7.4 states that this
  is not permitted. It also causes duplicate address detection failure,
  since each instance of the virtual router was configuring the same
  IPv6 address on the same subnet.
  This commit stops the offending link-local address being addied (or removes
  it if it can't stop it being added), and since VRRP advertisements must
  be sent with the virtual MAC address, but a link-local address for the
  interface, if a link-local address from the underlying interface exists,
  it is added to the VMAC interface, otherwise the MAC address of the
  underlying interface is used to generate a link-local address, which is
  then added.
  It wasn't until Linux 3.17 that the IFLA_INET6_ADDR_GEN_MODE netlink
  message was added, via which one can stop a link-local address being
  automatically configured. Therefore, if IFLA_INET6_ADDR_GEN_MODE is not
  supported, the only way to ensure that the problematic link-local
  address is not added is to remove it after the interface is brought up.
  This is not ideal, since there is a small window when the "illegal",
  and possibly duplicate, link-local address exists, but I haven't
  found any other way of doing it for pre 3.17 kernels.
* vrrp: Stop sending unnecessary attributes in netlink messages.
  When an IPv6 virtual address was deleted, it was being reported
  in the log file that preferred lifetime was being set to 0, which
  is only relevant when the address is being added. This commit stops
  adding the IFA_CACHEINFO attribute when deleting addresses, and
  also stops adding other unnecessary attributes.
* vrrp: Allocate an IPv6 link local address to VMAC if none on real
  The physical interface than a VMAC is configured on may not have an
  IPv6 link local address, but we can construct one for the VMAC using
  the MAC interface of the underlying interface.
* vrrp: Remove code allowing mixed IPv4/IPv6 addresses.
  If addresses of both types were configured, the receiving end would
  reject the packet since the count of addresses received would have been
  wrong since only addresses of one family can be sent, see vrrp_in_chk:
  if (hd->naddr != LIST_SIZE(vrrp->vip))
  Since we don't want to send the addresses of the wrong family, add them
  to the virtual_ipaddress_excluded block rather than the virtual_ipaddress
* vrrp: Only set router flag in Neighbour Advertisements if forwarding.
* vrrp: Enforce maximum number of vips per virtual router.
  If there were more than one virtual_address blocks in a
  virtual_router block, one could add as many virtual addresses as
  one wanted, since it didn't check the number already read.
* vrrp: Don't ignore excess virtual_address entries.
  If there are too many virtual_address entries, add them to the
  excluded block, but still give a warning message.
* vrrp: Verify VRRP configuration after all configuration read.
  There was a lot of duplicated checking in vrrp_parser.c to ensure that
  configured parameters were consistent, and also a requirement to configure
  certain parameters before others. This checking was incomplete, and also
  becoming more and more complex as more configuration options were added.
  This commit delays a large part of the checking until after all the
  configuration has been read. This removes the need for options to be
  specified in a certain order and also for checking in multiple places
  whether certain combinations are valid.
  As a consequence of the delay in checking the configuration, the creation
  of the VMAC interfaces is delayed until after the checking.
* vrrp: Accept is only valid for VRRPv3
* vrrp: Verify priority and init_state consistent.
* vrrp: Verify password specified for authentication.
* vrrp: Verify have an ip address for interface.
* vrrp: xmit_base is only valid on a VMAC.
* vrrp: Ensure at least one VIP is configured on a VRRP instance.
  This commit requires at least one VIP to be configured on a
  vrrp_instance.  Although the code looked as though it was designed to
  allow 0 VIPs, not only was that a protocol violation, but also keepalived
  rejected any VRRPv3 packets received without any VIPs, and also any VRRPv2
  with IPv6  due to the check in vrrp_in_chk() in vrrp.c.
* vrrp: Generate unique default VMAC interface names.
  Since the virtual router ID can be duplicated both between IPv4 and IPv6,
  and also between different interfaces, the approach of setting a default
  interface name as vrrp.VRID could produce duplicate names.
  This commit now attempts to use vrrp.VRID, but if that already exists,
  then it will try vrrpN.VRID, where N starts from 1 and increases until an
  unused name is found (for IPv6 it tries vrrp6.VRID before vrrp1.VRID).
* vrrp: Ensure necessary uniqueness of VRIDs.
  VRIDs must be unique for a given address family and interface.
  This commit ensures that there is no duplication of VRID/address family
  on any interface.
* vrrp: Don't assign VIPs/eVIPs to the default interface.
  alloc_ipaddress was always setting the interface to DLFT_INT (eth0) if no
  dev DEVNAME was specified to a VIP/eVIP/static address. This is fine for a
  static address, but doesn't make sense for a VIP or eVIP, since they should
  be assigned to the vrrp_instance interface, unless explicitly configured
  In fact, it probably doesn't make sense to specify dev DEVNAME for a
  VIP/eVIP, since the addresses must be assigned to the vrrp_instance
* If a configuration error occurs between {}, skip to end.
  If a configuration error occurred in a block, the parser could get confused.
  This commit makes the parser ignore ignore all further entries until the end
  of the block.
* Don't allow specification of default as an address where inappropriate.
  The function parse_ipaddress would allow default or default6 to be
  specified for any address it parsed, but it doesn't makes sense in a
  lot of cases, so add a parameter to indicate if default is valid.
* Improve checking of configured advertisement timer.
* vrrp: Make sure that a VRRP instance has a name and is unique.
  It was possible to specify a vrrp_instance without a name. It was also
  possible to specify the same vrrp instance name twice.
* Extra validation for reading ip addresses.
* vrrp: Ensure a sync group has a name and hasn't already been specified.
* vrrp: VRRP authentication is dependent on VRRPv2 not IPv4.
  The check for whether authentication is not dependant on IPv4, but rather
  VRRPv2. This check will be conducted following reading the whole configuration.
* vrrp: Log error if unknown authentication type.
* Check for, and handle, '{' at beginning of a block.
  There was no check for a '{' at the beginning of a configuration block.
  This commit is the start of that check, allowing it either at the end
  of the line with the keyword, or on a line of its own.
  Also, in respect of group and notification_email, for all other configuration
  items, the '{' could follow on a line of its own, but for configuration
  items using read_value_block the '{' on a line following the keyword
  was read as a configuration entry.
* Check for, and report, unknown keywords.
  A misspelt keyword would have been silently ignored, potentially causing
  the user difficulty in understanding why his configuration wasn't working.
* If an address fails to parse, ensure don't return an apparent address.
  When reading an address, the address family was set early on, and a
  subsequent failure to parse the address left the address family configured,
  thereby making it appear that a valid address had been read. Simply set the
  address family to AF_UNSPEC on a failure.
* Ensure an address option has a value.
  There was no check that the parameter was present after a keyword, so for
  example : dev
  would not have generated an error message, and alloc_ipaddress would have
  attempted to read a word after dev, which would either cause a dore dump
  or possibly return a parameter from a previous configuration line.
  This type of checking probably needs to be added elsewhere too.
* Add validation of address scope.
* vrrp: Don't allow group block more than once in a sync group.
  If a second group is configured, the first group is lost, and its
  malloc'd memory is also lost.
* vrrp: Make sure sync groups have at least two members.
  If a sync group was configured with no group {} statement, or if
  the group statement had no entries, then keepalived would core dump.
  This commit rejects groups with 0 members, and also with 1 member,
  since it isn't a group. It also checks that a virtual_instance isn't
  configured in more than one sync group, and also that the group
  members specified exist.
* The address must be the first record in an address configuration item.
  When an address is configured, it must be the first entry on the line.
  This allows options specified afterwards to know the address family,
  and also when reporting errors to include the address.
* vrrp: Log error if IPv6 and first address is not link local.
  RFC5798 section 5.2.9 requires that if the protocol is IPv6, then
  the first address must be the link local address of the virtual
* vrrp: Ensure that the full VRRP packet has been received in the buffer.
  Although afer receiving a VRRP packet, it checked that the length
  specified in the IP header was long enough to contain all the VRRP data,
  it didn't check that the data actually received was sufficiently long,
  so this check is added.
* vrrp: Stop VIPs in same CIDR being deleted, but only when using vmac
  so far.
  If an interface has more than one IP address in the same CIDR, when
  the "primary" address is deleted, all the secondary addresses are
  also deleted, unless /proc/sys/net/ipv4/conf/IFACE/promote_secondaries
  is 1. This commit sets the promote_secondaries flag on vmacs.
* vrrp:  Make from and to for VRRP iprules use a define.
  "From" and "To" were being stored as words rather than converted to
  defined value. This made storage requirements larger and processing
  them more time consuming.
* Don't report configuration bytes used if not _DEBUG_.
  If _DEBUG_ is not defined, malloc was increasing the count of memory
  allocated when called, but free wasn't reducing the count, and so the
  figure reported was meaningless.
  This commit completely disables the memory allocated counting and
  reporting if _DEBUG_ is not defined.
* vrrp: Use defines for address scopes.
  Rather than hard coded values for address scopes, use RT_SCOPE_*
* Force order of multiplication and division to avoid underflow.
* Clear list pointer after freeing list.
* Fix handling of active in vectors. active wasn't being consistently
  updated or reported for vectors.
* Make functions always returning 0 void.
  Three functions in utils.c always returned 0, and the calling
  functions weren't checking the return code, since it was pointless,
  so the functions have been changed to be of type void.
* Use struct in_addr rather than uint32_t for IPv4 address.
* vrrp: Disable all VMAC configuration code if don't have VMACs.
* Allow multiple spaces in quoted strings.
  The handling of quoted strings saved each word separated between
  tokens of '"'. This meant reconstructing a quoted string lost multiple
  spaces and was hard work.
  Quoted strings are now saved as the whole quoted string, without the
  quotes, so retrieval is much simpler. This also allows further keywords
  to follow the quoted string, if desired.
* vrrp: Remove string length dependencies in vrrp_print.
* vrrp: Stop using deprecated bcopy.
* vrrp: Add vrrp_instance name to some log messages.
* Optimise returning from list_element() when end of list reached.
* Make free_melement a static function.
* Use INET6_ADDRSTRLEN rather than hardcoded length.
* Don't format log message if not going to log it.
* vrrp: Add option to reduce vrrp advert address checking.
  By default, every received VRRP advertisement checks the advertised
  addresses are the same as the configured addresses, which is o(n^2).
  This change adds the option to check the first packet received from
  a master, but not to check the VIP list in subsequent adverts from
  the same master.
* vrrp: Ensure vrrp_buffer large enough for largest possible received
  The allocated receive buffer had size VRRP_PACKET_TEMP_LEN, which
  suggests that it wasn't intended as the final solution.
  Instead of using a fixed buffer size, the maximum MTU across all the
  interfaces is calculated, and the size of the vrrp_buffer allocated
  is the maximum MTU size. This guarantees that any VRRP packet received
  will fit in the buffer.
* vrrp: Improved received VRRP packet checking.
  First check the protocol headers have been received, then before
  checking the overall length of the received data, check the data in
  the protocol headers, since this will allow more meaningful errors
  to be reported. For example if there was a mismatch between VRRP
  versions with IPv4, a length error was being reported, rather than
  the version mismatch.
  All the error messages in VRRP packet checking now include VRRP
  instance name, to help tracking down where the error lies.
* vrrp: Remove fixed limit number of VIPs in a VRRP advert.
  There was an arbirtary limit of VRRP_MAX_VIP (20) VIPs for sending
  a VRRP advert. Now that the vrrp_buffer is sized to be able to
  receive any packet up to the largest MTU size, we can dynamically
  allow as many VIPs as will fit in a packet (which varies depending
  on IPv4 or IPv6).
  There is also an overhead checking the received addresses in an
  advert against the VIPs configure on the instance, but this can now
  be mitigated by setting skip_chk_adv_addr on the VRRP instance.
* vrrp: Fix printing of vrrp tracking scripts.
* vrrp: Print Last transition time in human readable form.
* Disable assert statements unless _DEBUG_ is defined.
* Streamline free_list_element
* Remove duplication of code between free_list and free_list_elements.
* vrrp: Add vrrp strict mode, enforcing VRRP compliance.
  The commit doesn't yet implement strict mode, but it will block
  0 VIPs, unicast peers, IPV6 in VRRPv2.
* vrrp: Add some strict tests.
  In strict mode, the following are enforced:
    IPv6 required VRRPv3
    There must be at least one VIP per VR instance
    No unicast peers
    Must be address owner to start in MASTER mode
* vrrp: Don't allow AH authentication with IPv6 and VRRPv2.
  Of course, the RFCs don't allow IPv6 in VRRPv2, but it is an
  extension supported by keepalived.
* vrrp: Some minor ipsecah updates.
* vrrp: Clearly identify that VRRP has subblocks of VRRP scripts.
  The keepalived.conf.5 man page wasn't explicit that there are VRRP script
  subblocks as part of the VRRP configuration, and this is now explicit.
* Trivial edits to man page keepalived.conf(5).
* man page remove static_rules configuration from vrrp_instance.
  keepalived.conf.5 man page had an entry for static_rules within the
  vrrp_instance blocks, and this is clearly wrong.
* vrrp: Fix typo in error message when sending VRRP advert.
* vrrp: Add option not to include vrrp authentication code.
  RFC3768 updated VRRPv2 to remove authentication in 2004. This commit
  adds a configure time option to exclude authentication code.
* vrrp: When adding ip(6)tables entries, only specify i/f for link_local
  Packets to/from global address could arrive or be sent on any interface,
  so don't specify the interface for blocking the packets. For link local
  addresses, the block must relate to the specific interface.
* vrrp: Add ability to use libiptc rather than invoking ip(6)tables.
  Invoking ip(6)tables has a high overhead, since the process has to be
  forked and exec'd, and then it has to read the whole ip(6)tables
  filter chain before it makes a single update and commits it back.
  Using libiptc avoids the overhead of multiple forks/execs, and also
  means that multiple entries can be added/deleted to/from the ip(6)tables
  configuration in a single update.
* vrrp: Add option to use ipsets instead of iptables to block addresses.
  Instead of having lists of addresses in iptables, it is much more
  efficient to use ipsets to handle those addresses, since that is
  what it is designed for.
* Use /proc/sys/kernel/modprobe to find modprobe.
* Reinstate SIGCHLD before forking to exec modprobe for ip_vs.
  The fork of modprobe to load ip_vs would have reported a failure
  even though it would have succeeded.
* Reinstate SIGCHLD before forking to exec modprobe for ip_vs.
  The fork of modprobe to load ip_vs would have reported a failure
  even though it would have succeeded.
* Fix forking/execing re closing signal pipe.
  When calling scripts, we don't want to give them access to the signal
  pipe used between the parent process and the vrrp process.
* vrrp: Fix compile error when net/if.h and netlink/route/link.h conflict.
  Some versions of libnl3 netlink/route/link.h conflict with some
  versions of kernel header file net/if.h. This commit has a
  workaround for when there is a conflict.
* vrrp: Fix compile failure with old kernels and libnl3.
  Issue #215 identified a compile error with pre 3.13 kernels when
  libnl3 was installed. This commit adds a test for that situation
  and avoids using rtnl_link_inet_[sg]et_conf.
  I haven't been able to test this on a re 3.13 kernel, but I have
  simulated the scenario and it compiles as expected.
* vrrp: Fix compilation when ipsets not installed.
* vrrp: Fix build breakage when not using libiptc.
* vrrp: Fix VRRP respawning when no VIPs specified.
  Commit b46dec58fa failed to check the the VIP list existed before
  checking how many entries were in the list.
  This commit also defaults the address family to IPv4 if no VIPs are
* vrrp: Make dependency on libnfnetlink/libnfnetlink.h conditional.
* Streamline handling of daemon mode flags.
* Improve handling of not being able to read a pid file.
  If a pid file was opened, but for some reason a pid could not
  successfully be read, the pid used to check if a process was
  running was random.
* Remove unused pid filename definitions.
* Change outstanding debug flag tests to use bitops helpers.
* Allow for different sizes of long ints in bitops.
* vrrp: Ensure conversions of vrrp->adver_int etc don't overflow.
* Use bitops with daemon_mode.
* vrrp: Fix ip_rule direction for SNMP.
  Commit 2da11f99 introduced defines for ip_rule directions rather
  than using strings, but the commit omitted to update the snmp code
  when processing the directions.
* add a line about the 'include' keyword in keepalived.conf(5).
* fix HTTP_GET config dump. The config dumper routine
  dump_http_get_check was always printing the last configured checker's
  connection info.
* dump_conn_opts: prototype change.
  pass the conn_opts_t pointer as a void* parameter to make the
  function prototype a valid dump callbac This makes smtp_dump_host()
  function needless, it is removed.
* fix build issues on older systems.
  Try to avoid the build error on systems which lack of
  O_CLOEXEC and IP_MULTICAST_ALL defines (such as Ubuntu lucid and
  Debian squeeze).
* Fix compilation with --disable-vrrp-auth
* vrrp: Remove state VRRP_STATE_LEAVE_MASTER since it isn't used.
* vrrp: Fix VRRPv2 authentication issues.
* Don't redefine _GNU_SOURCE.
* vrrp: Exclude function vrrp_ah_sync when --disable_vrrp_auth.
* Fix some conditional compilation errors.
* Streamline getopt_long options.
* Remove '\n's from log messages.
* Ensure standard configure generated defines are used.
  The defines used in the compiles in the various subdirectories were
  specified in each which could lead to inconsistencies.
  This commit defines APP_DEFS in, which is then used
  in each
* Dump keywords to file rather than stdout.
* Add copyright message and build options to version output.
  This commit also ensures that the end year of the copyright date
  range is the current year when keepalived was built.
* Stop erroneously logging error message for unknown keywords.
  When vrrp_parser parsed the configuration file, it didn't know
  about the checker keywords, and vice versa, and so reported errors.
  This commits makes the other keywords known but marked as inactive.
* vrrp: Fix SNMP trap NewMaster.
  The trap must only be triggered for IPv4, since RFC2787 doesn't
  understand IPv6. Also, RFC2787 only supports VRRPv2 instances,
  so don't raise the trap for VRRPv3 instances.
  The IP address returned must be the actual IPv4 address, and not
  the ip_address_t that holds the address.
* vrrp: Use underlying interface for ifindex in NewMaster traps for vmacs.
  If the VMAC ifindex is returned, then there is no indication that
  multiple VRRP instances are operating on the same physical interface,
  so return the ifindex of the underlying interface. This will also
  mean that the same ifindex should be maintained between different
  invocations of keepalived.
* vrrp: Move SNMP private defines into vrrp_snmp.c/check_snmp.c.
  The defines for the net-snmp "magic" were in the header files
  which were included by other modules. The defines are private to
  the c source file, so move the defines into them, to avoid polution
  compilation units which included vrrp_snmp.h/check_snmp.h.
*  Use definition for
* vrrp: Start SNMP after reading configuration.
  If SNMP is started before the configuration is read, a meaningless
  response will be returned to net-snmp, so don't start the snmp agent
  until after all the config has been read.
* vrrp: Fix setting SNMPv2-MIB::sysORID entries in ORTable.
  The length of the OID passed to register_sysORTable was wrong.
* vrrp: Allow SNMP agent to unregister cleanly with more than one MIB.
  Separate snmp_unregister_mib() out from snmp_agent_close() to allow
  multiple MIBs to be unregistered before the snmp agent is closed.
* vrrp: Don't register the global_oid with SNMP twice.
  If SNMP is enabled, both the checker process and the vrrp process
  were registering the global_oid. This commit makes the checker
  process register it if it is running, otherwise the vrrp
  thread registers it.
* vrrp: Add read-only support for RFC2787 SNMP (VRRPv2).
* vrrp: Allow any combination of keepalived and RFC SNMP support.
* Allow enabling snmp via config file.
* ipvs: sctp ad persistent engine support.
* Fix building with --disable-lvs
* Stop autoconf complaining.
* vrrp: Use defined value for maximum VRRP priority.
* vrrp: Simplify scheduler code vrrp_leave_fault().
  Two pairs of code blocks were repeated, and each pair could be
  reduced to occuring only once if the conditions were merged.
* vrrp: If VRRP priority is 255 and not nopreempt, configure like state
* vrrp: Ensure number of VIPs doesn't exceed 255 per instance.
* vrrp: Don't check second time if IFLA_IFNAME is NULL.
* Dump interface details with rest of config.
* vrrp: When becoming master, block addresses before adding them.
  If not accept mode, entries are added to iptables/ipsets to block
  traffic to the VIPs/eVIPS. These entries should be added BEFORE the
  addresses themselves are added, to ensure there isn't a (small)
  window when we might reply from the added addresses.
* vrrp: Document virtual_rules.
* Fix memory leak re some uses of ipaddresstos().
* Fix parsing ipset names.
* vrrp: Improve and fix finding vmacs left over from previous invocation.
  When netlink reports a new or existing interface, we can extract
  information that allows us to determine if the interface is a macvlan,
  and the type (e.g. private). We can then save that in the interface_t
  structure, setting the vlan flag, and base ifindex.
  When working out the interface name to use for VMAC instances, we can
  then check the interfaces which are macvlans to see if any of them
  match the vrrp instance in terms of mac address, underlying interface
  and inet address family, and if so we can then reuse the macvlan interface.
  Commit 9ae463e7f broke the finding of existing interfaces where the
  configuration didn't specify the VMAC interface name, and simply created
  a new interface. This commits now resolves that.
  There is still an issue that if an interface was in MASTER mode when
  keepalived terminated, when keepalived restarts it leaves the VIPs and
  eVIPS on the interfaces, meaning that keepalived cannot receive VRRP
  packets on the interface from the VRRP instance that has taken over, and
  it also means that there are duplicate IP addresses on the network.
  Another commit will resolve this issue.
* vrrp: Remove ip addresses left over from previous failure.
  If keepalived terminates unexpectedly, for any instances for which
  it was master, it leaves ip addresses configured on the interfaces.
  When keepalived restarts, if it starts in backup mode, the addresses
  must be removed. In addition, any iptables/ipsets entries added for
  !accept_mode must also be removed, in order to avoid multiple entries
  being created in iptables.
  This commit removes any addresses and iptables/ipsets configuration
  for any interfaces that exist when iptables starts up. If keepalived
  shut down cleanly, that will only be for non-vmac interfaces, but if
  it terminated unexpectedly, it can also be for any left-over vmacs.
* Sort out extraneous space and tab characters.
  The commit removes spaces followed by tabs, trailing spaces and tabs,
  and replaces occurrences of 8 spaces within tabs, except where the
  spaces and or tabs occur within strings.
  This has the benefit that if blocks of code are copied, git does not
  complain when running git am on a file produced by git format-patch.
* vrrp: Simplify RFC SNMP code.
  The code was checking VRRP version unnecessarily, and also had code
  to return an index element which is not necessary.
* vrrp: Don't send traps for SNMP MIBS which are not enabled.
* vrrp: Don't register SNMP global OID if not handling it.
  If neither the checker nor the vrrp components of KEEPALIVED-MIB
  are enabled, don't register the global OID.
* Parameters passed to traps don't need to be static.
* Fix --without-lvs and --without-vrrp configure options.
* Ensure general MIB is enabled if --disable-lvs configured
* Avoid compiler warning re function definition to prototype.
* Add RFC6527 SNMP (VRRPv3).
  This commit adds read-only and notifiction support for SNMP for VRRPv3
  in accordance with RFC6527.
* vrrp: Fix MAC address for IPv4 VMACs created after IPv6 VMACs.
* vrrp: Allow routes and rules to use tables >= 256
* Don't recompile libipvs-2.6/*.c every build.
* vrrp: Remove left over ip rules and routes at startup.
* vrrp: Ensure ip routes added before rules, and vice versa.
  If ip rules are added before routes, then it is possible for a
  packet to be routed while the routing table is only partially
  complete. Adding the rule after the routes ensures that the routing
  table won't be processed until it is completely set up.
  Likewise, when removing rules and routes, remove the rules first.
* vrrp: Add missing reason message for rejected VRRP packet.
  Issue #255 show a log identifying bogus VRRP received, but there
  was no reason shown for the rejection. The only instance I can find
  for this is if vrr->family is neither AF_INET or AF_INET6, which I
  think must be a bug in the code parsing and setting up VRRP instances.
  This commit just adds a log message to be explicit about why the packet
  is rejected, and also reports the value of vrrp->family.
* Reduce number of calls to getaddrinfo() reducing DNS lookups.
* Report if vrrp or checker process abnormally terminates.
* Add option to increase child process priorities and make non swappable.
* Make vrrp_daemon.c and check_daemon.c use header file for externs.
* Add reporting ops mode, and minor tidying up of virtual_server config.
* vrrp: Don't overwrite real interface MAC address with VMAC MAC address.
  When a VMAC was being created, the MAC address of the VMAC was
  being copied to the MAC address of the underlying interface in the
  interface_t structure.
  The netlink reflector sets up the MAC address of the new VMAC
  interface, so there is no need to copy a MAC address at all.
* vrrp: Stop keepalived_vrrp terminating with SIGSEGV if lvs_syncd_if set.
  ipvs_stop() was being called before shutdown_vrrp_instances(), and
  so if lvs_syncd_if had been specified on a vrrp instance, keepalived
  would subsequently terminate with a SIGSEGV in free_interface_queue().
* Make lvs_sync_daemon global config rather than vrrp specific.
* Stop lvs sync daemons on restart in case of prior abnormal termination.
* Remove any residual ipvs configuration on restart.
* vrrp: Optimise clear_diff_vrrp_*() functions.
* Check MALLOC returned non NULL before copying to the location.
* Allxoow specifying syncid for lvs syncd.
* vrrp: Send second set of GARP messages afer receiving lower prio advert.
  When a VRRP instance transitions to master state, if garp_master_delay
  is non-zero, a second set of garp_master_repeat messages is sent after
  garp_master_delay seconds (unless 0). However, if a lower priority advert
  is received, keepalived didn't send a second set. This commit sends a
  second set if a second set would have been sent after transition to master.
* vrrp: Allow setting of graduitius ARP parameters for lower prio adv
* Don't log a "keepalived stopped" message if keepalived already running.
* vrrp: Add support for iprule and iproute table names.
* Resolve MALLOC/FREE issues to iprule/iproute table names.
* Make keepalived_malloc return void* to match malloc.
* When reporting MALLOC/FREE status on exit, report max MALLOC'd memory.
* Make libipvs use MALLOC/FREE.
* Don't restore original signal state when reloading checker config.
* Ensure signals USR1 and USR2 are set to ignore in checker process.
* vrrp: Only free list of iprule table names if list assigned.
* vrrp: Fix strict mode of vrrp instance overriding global vrrp_strict.
* Attempt to fix build breakage introduced in commit 85f81dd.
* Fix parsing of scope for ip addresses.
* Free global ssl context on reload.
* Free request_t buffer and ssl data on reload.
* vrrp: Restore sync-state after reload.
  Currently the sync state is rebuilt from the member states after
  config reload. This changes now reloads the previous sync state
  after reload, and then pushes this back to the group members. If a
  new group member is added during the reload, then the new group
  will accept the sync group state. If a group member is removed
  during a reload, then a special case will be executed to force
  the sync-group state to BACKUP. This is required so that an
  alternative backup peer for the removed group is given an
  opportunity to take over the gateway.
Release 1.2.19
* vrrp: fix checksum computation in vrrp v2 for socket family AF_INET
  One of difference between VRRPv2 and VRRPv3 is the way checksum is
  computed. In VRRPv2 no accumulation is specified in RFC while in VRRPv3
  it uses regular accumulator with upper pseudo header. This fix restore
  compliant VRRPv2 for AF_INET vrrp instance. Since IPv6 socket are using
  IPV6_CHECKSUM option this means that checksum for VRRPv6 instance runing
  in native_ipv6 mode are broken. But since this is a end to end sanity
  check and both side are operating the same way this OK, no "compliant
  with VRRPv3 RFC", but anyway using native IPv6 on VRRPv2 is not really
  compliant too ;)
* Some cosmetics at Makefile stuff.
Release 1.2.18
* some cosmetics changes (in memory and parser).
* remove dead/not used code.
* revert notify script brought by last release.
* revert VRRP preemption speed up extension.
* vrrp: ix vrrp removes incorrect IPv4 address when VIPs
  are removed.
* vrrp: Re-enable VRRPv2 checksum on inbound pkts.
Release 1.2.17
* zalloc use xalloc for consistency.
* memory: fix wrong size calculation in zfree.
* Fix keepalived snmp configuration.
* Change comments to match kernel style.
* smtp: Fix wrong algorithm in RCPT-TO building.
* vrrp: ICMPv6 : modify the way we copy the src address into the IPv6
  header, in order to not overwrite the header' and the 'hop limit' fields
* vrrp: sync status flag (up/down) for _all_ VMAC interfaces.
  When using VMAC and running multiple instances on the same interface,
  only one of the VMAC interfaces will get its status flag synched.
  This commit will update the status flag for _all_ VMAC interfaces attached
  to a base interface.
* ipvs: fix segfault crash when parsing SMTP_CHECK config
* ipvs: SMTP_CHECK now respects configured RS port. Before that it always
  used the default port 25.
* ipvs: config parser: handler for the end of block. new function
* ipvs: new log function vlog_message taking varg_list. log_message now
  uses format gcc attribute, not the macro wrapper.
* ipvs: bug: check_smtp was logging "#30" instead of RS address do not do
  nested va_start/va_end calls in smtp_final.
* ipvs: clarify snmp_check config syntax. Now host{} section is optional,
  and all the standard connection options are available in the SNMP_CHECK{}
  level, too. If one or many host section persist, those base-level options
  are used to specify default values that can be overriden in a host section.
* vrrp: Use literal constants for bit flags Use literal constants for bit
  flags of the "debug" global variable Change from using numeric constants
  to literal constants for the bit flags of the "debug" global variable.
* vrrp: Backup obtains VIP resulting in a duplicate IP. VRRP backup obtains
  VIP resulting in a duplicate IP situation. When a priority change to the
  configuration of a Master router drops its priority to below that of a
  backup router, the VIP is not released on the Master router leading to
  a duplicate IP situation.
* vrrp: Make preempt_delay work more than once.
* vrrp: Changes needed to support AH auth in VMAC mode. Note according to
  the RFC this is not a requirement, but we think that our customers will
  expect it to work. The RFC actually discourages its use because it adds
  little to no additional security.  We are still able to interoperate in
  RFC mode by not enabling authentication.
* vrrp: Check VRRP header in the IP auth header is correct. In the middle
  of vrrp_in_chk, the existing VRRP packet parsing code does
  "return vrrp_in_chk_ipsecah(vrrp, buffer);" if the VRRP version is two,
  and the authentication type is IP sec authentication, to check whether
  or not the IP sec authentication header is valid.  However the "instant"
  returns means that is the IP sec authentication header is valid, then
  the remaining parts of the VRRP packet (VRRP version, VRRP checksum,
  VRID, number of VIPs, advertise-interval) are not parsed or validated.
* vrrp: Add support for SNMP trap: vrrpTrapNewMaster.
* vrrp: Add skeleton code for VRRP-MIB.
* vrrp: Check existing VIF and recreate if VMACs are wrong. Although under
  normal circumstances we will cleanup VIF interfaces when shutdown, there
  are various scenarios were this is not the case. To make the code more
  robust, keepalived now performs a check for matching VIF interfaces at
  restart, and if the configuration of the VIF matches the current
  keepalived configuration it will reuse the VIF. However, should the
  configuration be different, keepalived will remove the existing
  interface, and then recreate a new VIF interface with the appropriate
  configuration. This fix resolves the continuous crash scenario that can
  occur when keepalived fails to configure the VIF because one already
  exists. It prevents keepalived from reusing a previous VIF interface
  which does not completely match it configuration criteria.`
* vrrp: fix snmp code (cosmetic)
* vrrp: Fix the keepalived mib and agentx warnings. During Keepalived
  startup, about twenty "duplicate registration" and a couple of "Failed
  to connect to the agentx master agent" warning messages were issued.
  Pairs of the "Failed to connect" warning messages were logged every two
  minutes. The "duplicate registration" warnings happened because VRRP
  called snmp_agent_init twice, once for the keepalived-vrrp MIB, and once
  for the rfc2787-vrrp MIB, however each call to snmp_agent_init also
  tried to register the keepalived-global MIB (which holds data like
  Keepalived version number, SMTP server details, and a "from" email
  address).  It was the second attempt to register this keepalived-global
  MIB that generated the "duplicate registration" warning. The registration
  of the keepalived-global MIB is now only done once under the control of
  a static variable.   init_agent is also called just once under the control
  of the same static variable to prevent it logging a warning message. The
  "Failed to connect" warnings occur because Keepalived does not know how
  to connect to the SNMP AgentX master server.  By default the Agent X
  master server is listening for MIB registrations on a local TCP socket
  with a port number of 705.
* vrrp: Fix VRRP preemption taking too long. VRRP preemption may not work
  correctly due to group expiry timers being incorrectly manipulated while
  running down the MDT. Also, preemption can be disrupted if the VRRP group
  receives an advertisement while running down it's timer.
* vrrp: Initial Implementation of VRRP statistics.
    . Add VRRP counters, This is needed by the VRRP-MIB, and will provide
      better insight into the operation of VRRP for users.
    . Add SIGUSR1 and SIGUSR2 handlers
      - SIGUSR1 allows users to dump current state of VRRP instacnes to
      - SIGUSR2 allows users to dump VRRP counters to /tmp/keepalived.stats
* vrrp: Copy old VRRP stats on reload.
* vrrp: Seperate printing functions from vrrp_daemon.c. Seperate state
  printing code from vrrp_daemon.c so that the code is better organized.
* vrrp: Track master router priority in VRRP.
* vrrp: Added 'Master priority' output to show vrrp detail.
* vrrp: Enhance keepalived vrrp to configure mltp-scripts. Currently,
  keepalived vrrp only allows to configure single notification script.
  This is a limitation ans should be extended so that keepalived vrrp can
  notify multiple scripts about vrrp state changes.
* vrrp: Don't display ipsec ah password in log files. When authentication
  type is selected as ipsec ah, password should not be displayed in the
  log files.
* vrrp: Fix notify upon reload. When a notify script is configured after
  Keepalived has been started, if other notify scripts are already
  configured, these scripts get reinvoked even if the state has not
  changed. This occurs when in backup state. When in master state, no
  notifications are sent out at all if a new notify script is configured.
  For the backup case, this problem occurs when the daemon is reloaded.
  This causes vrrp to leave the state it's currently in, go to the init
  state and from there, go back to backup. However, this transition
  causes the notify scripts to be invoked, causing a redundant
  notification to be sent. For the master case, there is no call to
  notify_instance_exec(), hence why no notifications are seen at all.
  The solution is to add a new field to the vrrp struct that stores the
  notify scripts that were configured before reload. A new function has
  been added to take advantage of this new field. Instead of calling
  notify_instance_exec() when we are in the init state, we now call
  notify_instance_exec_init(). This is a proxy function that modifies
  the 'script' member of a vrrp structure to point to a new list
  containing only scripts that have not previously been configured,
  thereby preventing the sending of notifications that have already been
  sent. This new list is created by utilising the new vrrp struct field.
  Inside this new function, notify_instance_exec() is called using the
  modified VRRP instance. When this call returns, the member is reset
  back to its original value.
* vrrp: Keepalived extension to support VRRP version 3. Updated vrrp_header
  and _vrrp_t struct to support version 3 params. Support to build vrrp_v3
* vrrp: Keepalived extension to support VRRP version 3 (2).
* vrrp: Keepalived extension to support VRRP version 3 (3). Timer changes
  to support centi-sec.
* vrrp: Keepalived extension to support accept mode for v3.
* vrrp: Fix up limitations of keepalived VRRPv3. The current Keepalived is
  supporting IPv6 but it is not fully functional and it is not as per
  RFC5798.  Following are the issues identified and changes done:
  - IPv6 address population.
  - Correction of Checksum in case of IPv6.
  - Getting source address from received advertisements.
  - Populating source address in sent VRRP advertisements.
* vrrp: Improve display output for VRRPv3.
  - Changed data-type of mcast_saddr to sockaddr_storage to support IPv6
  - Added new parameters version, accept, weight updated advertisement
    interval for operational command show output.
* vrrp: MIB enhancements for accept-mode.
* vrrp: Fix mismatched advertisement interval. In VRRP version 3, all
  BACKUP routers must set their advertisement intervals to match the current
  MASTER's. Although not explicitly stated in RCF5798, when the MASTER falls
  over or forfeits its MASTER status, the new MASTER should not continue to
  use the old MASTER's advertisement interval value and should instead use
  its locally configured value. To achieve this, a new field has been added
  to the VRRP structure that stores the most recent advertisement interval
  of the current MASTER. We track changes to the current MASTER's interval
  and update this new variable accordingly. The value is only updated when
  we are in BACKUP state and reconfiguring the local advertisement interval
  has no effect on it.
* vrrp: snmp: don't hardcode AgentX socket location. The default location
  should be `/var/agentx/master` (as per RFC2741 and this is also the
  default for NetSNMP, including on Debian-based distributions). This
  default location is set at configure-time for NetSNMP and subagent will
  use it automatically (it is also available through `net-snmp-config.h`).
  A useful feature would be to have a flag to change that if the user
  change this settings in the master agent. This commit just reverts this
  change to let SNMP subsystem work as expected for most users.
* vrrp: snmp: restore use of net-snmp-config to build SNMP support. With
  a lazy linker, `libnetsnmpmibs` may require some additional libraries
  to be linked (like `libsensors`). Therefore, only rely on
  `net-snmp-config` to get the appropriate flags.
  Also add some additional tests:
  - check that we can build a simple executable (NetSNMP can be quite
    broken and in this case, the error during compilation is not crystal
    clear, checking that in configure is more informative)
  - check if we subagent support is compiled in (This is optional and
    again, the error is not crystal clear during compilation).
  - check that net-snmp/agent/util_funcs.h is present (Due to a flaw in
    NetSNMP build process, this header was not installed for quite a long
    time, notably on RHEL derivatives; code to handle its absence was
    already present in Keepalived).
* vrrp: snmp: don't enable SNMP support automatically.
  Most users won't use it and it would fail if NetSNMP is not installed,
  unless a user add `--disable-snmp` to configure command line.
* build: move custom include directives (`-I`) first. Some libraries,
  notably NetSNMP, may pollute CFLAGS by adding stuff like
  `-I/usr/lib/x86_64-linux-gnu/perl/5.20/CORE` in CFLAGS. Instead of
  trying to not use CFLAGS from NetSNMP at all (some of those bits are
  important as they influence some NetSNMP headers), we ensure that the
  bogus include flags are after our own include flags.
* global: Set global data default values after parsing config file.
  This patch will defer setting the global data default values until
  after the config file has been parsed. This will potentially avoid two
  calls to getaddrinfo. For example, if the router_id and/or email_from
  parameters are set in the config file, there is no need to call
  getaddrinfo twice in order to set a default value. Instead, this patch
  will check to see if they values are unset after parsing the config
  file. Note that email_from and smtp_connection_to are only set to a
  default value if they are unitialized and smtp_server is specified.
* doc: add -x/--snmp flag to keepalived manual page.
* snmp: add -A/--snmp-agent-socket to specify AgentX socket.
Release 1.2.16
* Properly close netlink channel to avoid fd leak.
* Use getaddrinfo instead of gethostbyname to workaround
  glibc gethostbyname function buffer overflow.
* ipvs: log http timeout only when server goes down
  All other calls to log_message() when a check fails are
  performed when a server changes its state.
  The http timeout log message is the only exception.
* ipvs: properly fix bug when Q < H.
  The commit a77c2c7 has not fixed the issue.
  Log messages became accurate, but unsigned comparison
  was still in use.
* ipvs: HUP processing refactored.
  copy_srv_states is removed: we can copy states with
  existing clear_diff_*functions, as long as
  clear_diff_services is called before the init_services.
  vs_exist, rs_exist: remove side-effects from these functions.
  Now they do only search and return pointers.
  get_rs_list removed: the new rs list is now passed to
  init_service_vs: quorum_state assignment is not needed
  here. It is already assigned either by vs constructor, or
  by alpha handler, or by clear_diff_services.
* ipvs: refactoring link vsg structure to vs.
  this adds a pointer to virtual_server_group_t into
  the virtual_server_t structure and fills these pointers
  after config load.
  This change will allow to access vsg items of a vs easily,
  without iterating and name compare.
* ipvs: refactoring use links to vs->vsg links.
  ipvs_cmd: removed vs_group list parameter. Link to vsg
  is obtained via vs->vsg. These functions are also modified
  in the same way: ipvs_group_cmd, clear_service_rs,
  clear_service_vs, clear_diff_rs.
  clear_diff_vsg: new_vs is passed as a param, vsg pointers
  are retrieved w/o iterating.
* ipvs: fix problems with config reload.
  The commit 7bf6fc contained a bad trying to fix the issue
  when an alive RS does not appear in a new VSG entry on reload.
  It has not fixed the original issue and added a new one:
  vs_groups lose quorum on config reload.
  This commit fixes the issue properly, and also the case when
  RS in VSG is in inhibit mode.
  The reloaded flag is added to the virtual_server_group_entry_t.
  ipvs_group_sync_entry: add alive destinations to the newly
  created vsge.  It is aware of inhibit-on-failure destinations.
  sync_service_vsg: calls the former for each created vsg entry
  vsge_exist: changed just as other *_exist routines.
* genhash: add support of fwmark in genhash
* genhash: terminate thread if connect_error
* Fixed filenames and paths so that make uninstall removes
  initscript and man pages. Changed perms for keepalived.sysconfig
  from 755 to 644
* Fix a typo in dump_global-data().
* vrrp: revert previous buggy preempt extension.
* smtp: fix infinite loop when the smtp server unexpectedly
closes the connection.
Release 1.2.15
* vrrp: Use ancillary data on sending path for IPv6
  mcast_src_ip. Well, previous code used bind() to specify
  IPv6 src address. Ancillary data is a much more cleaner
  and efficient way...
* ipvs: Fix format of long int in log_message call.
* ipvs: fix building with fwmark disabled.
* vrrp: Pointer dereference before NULL check.
* STR(SMTP_PORT) returns "SMTP_PORT", not "25".
Release 1.2.14
* The "Date:" mail header is now localtime.
* bugfix: fwmark field was formatted as signed int
* dump_conn_opts: fwmark was not displayed.
* log_message: emit -Wformat= compiler warnings.
  There could be (and actually are) situations when the format
  string and the arguments list passed to the log_message() are
  inconsistent or mistyped. The compiler did not show any warnings
  because the vsnprintf was called indirectly.
* Further unification of IP endpoints logging.
  This change tries to keep usage of the standard "[%s]:%d" format
  string to a minimum. Instead, use inet_sockaddrtopair wherever
* Add SNMP subsystem option to man page.
  The keepalived(8) man page did not mention the -x option to
  enable the SNMP subsystem. This patch adds the -x (and --smmp)
  options to the keepalived(8) man page, as described in the
  keepalived help message.
* vrrp: fix gratuitous ARP refresh timer handling.
  Previous code was using an 'int' to store parsed timer value.
  This value was then expanded to TIMER_HZ which can lead to a
  wrapping issue if requested timer is longer than local machine
  'int' representation. This patch reworked the code to use
  timeval_t instead and perfrom regular timeval operations.
* vrrp: Fix a memory leak while dropping incoming IPSEC-AH
  authenticated advert. Digest was allocated in previous code
  without freeing it on HMAC-MD5 missmatch.
* vrrp: Extend IPSEC-AH auth to support unicast.
  If you plane to use IPSEC-AH auth in unicast mode (which THE best
  idea), then IP header TTL MUST be zeroed since it is mutable field
  on transit.
* vrrp: Update VRRP VMAC doc.
  Add vmac_xmit_base in configuration example and force rp_filter=0
  on macvlan interface.
* vrrp: make gratuitous ARP repeat count configurable.
  . garp_master_repeat : Gratuitous ARP count sent on the wire
                         after MASTER state transition.
  . garp_master_refresh_repeat : Gratuitous ARP count sent on the
                                 wire when garp_refresh_timer fir
* vrrp: fix preempt and state BACKUP when prio 255.
  This makes it so that keepalived will respect various settings that
  should prevent it from assuming the MASTER role for a vrrp_instance
  unconditionally and immediately, even if the priority of the
  vrrp_instance in question is set to 255 (VRRP_PRIO_OWNER). These
  settings include:
  ---- conf ----
  state BACKUP
* vrrp: in backup state notify when vrrp is not up and move to FAULT
* ipvs: failed RS was flapping on config reload.
  The RS disabled by health-checker was turned on w/o health-checking
  by SIGHUP handler in the init_service_rs() subroutine.
  This did not happen with alpha mode set.
* libipvs: allow IPv4 RS in IPv6 VS and vice versa.
  This change syncronizes local copy of libipvs with the upstream
  (kernel/ipvsadm/ipvsadm.git) to the date. IPVS in Linux 3.18 will
  include the feature of mixing of tunneled RS families in single VS.
  The compatibility with older kernel versions is kept.
* libipvs: minor bugfix with retreiving dest af.
  This change needs to be sent to the ipvsadm upstream, too.
  This clarifies the previous commit, so there is no need to mention
  it in the changelog.
* vrrp: check if interface is known when using use_vmac.
  vrrp->ifp is NULL when use_vmac keyword is defined before the
  interface keyword. This would result in a segfault
* vrrp: simplify macvlan creation.
  Create the macvlan interface in one netlink command rather than
  three (creation of the macvlan in netlink_link_add_vmac function,
  set of the mac address in the netlink_link_setlladdr function, set
  macvlan mode in the netlink_link_setmode function).
  This simplification:
  1. avoids potential issues if the firt netlink command passes butcw
     not the next ones
  2. reduces number of netlink messages (light optimization)
* ipvs: bugfix quorum state was flapping when Q < H.
  When a service had quorum < hysteresis, the lower threshold of RS
  weights was calculated incorrecly. Unsigned arythmetics was used, so
  errors like this appeared in log: Keepalived_healthcheckers[2535]:
  Lost quorum 1-2=18446744073709551615 > 10 for VS
  The up -> down quorum state transition was happening every time when
  alive RS set was changed. This bug was in place since
* vrrp: add support to IPv6 mcast src address specification.
  For some reason (well... which one ?), previous code didnt support
  specification of multicast source address in IPv6 mode. If you are
  using 'native_ipv6' and want to specify IPv6 mcast source ip address
  then you can use 'mcast_src_ip' keyword with IPv6 address.
* vrrp: Add support to IPv6 src_address discrimination in master
  rx state.
  Previous code didnt support IPv6 address discrimination while in
  MASTER state receiving same prio advert. This patch extend previous
  code to support IP address comparison agnostic.
* vrrp: IPv6 mcast src_addr handling and VMAC fix.
  Properly bind socket for v6 use-case when mcasr_src_ip is in use or
  when VMAC is used. This patch fix VRRP VMAC in native_ipv6 mode,
  previous code just use the vmac interface link-local IP Address as
  src_ip leading to a corner case (to keep polite).
* vrrp: in IPv6 scope_id is mandatory to bind link-local address.
  In IPv6 use-case, source IP address is set binding sokect to
  socaddr_in6. Linux Kernel requires interface to bind link-local
* vrrp: fix nopreempt mode in master_rx.
  While receiving lower prio advert, preempt election according to
  nopreempt keyword. By default preempt is on as requested by RFC.
* exit on malloc failure.
* genhash: code cleanup.
Release 1.2.13
* vrrp : Use the standard unsigned int types. This fixes
  building with musl libc, which does not expose the internal
  __uint* defines. (Natanael Copa)
* check : Fix template issue in IPv6 host header.
  (Jan Hugo Prins)
* ipvs : ipvs_syncd_cmd uses memset() to zero the daemonrule
  buffer before populating it and sending it up. daemonrule is
  malloc()ed by ipvs_start(). ipvs_start() can bail early if it
  can't communicate with ipvs. Neither place which call
  ipvs_start() check the return value, allowing them to walk
  straight into a NULL pointer deref. (jsgh)
* check : Without inhibit_on_failure on a real_server, when the
  server is marked down existing TCP connections to it are simply
  blackholed. Hence inhibit_on_failure: by setting the weight to
  zero no new connections are sent to that server, but because the
  server isn't completely removed from the table existing
  connections are allowed to continue. The same problem exists
  with sorry_server. When a real_server comes back up the
  sorry_server is removed from the pool and existing connections
  are blackholed. Instead of continued service, which may usually
  be a fast response indicating overload, the client must engage
  in a lengthy wait for the connection to time out. It would be
  better in many cases to allow the sorry_server connections to
  complete naturally. Luckily the code is structured well enough
  that all is required to get this behaviour is to set the inhibit
  member of the sorry_server structure, which is mostly just a
  change to the config file parser. (jsgh)
* check : unify logging of RS and VS. This fixes the bug of
  displaying a FWM service as [x.x.x.x]:0, where x.x.x.x is the
  first RS of that service. (Alexey Andriyanov)
* check : unify connection options among checkers.
  All the remote checkers (TCP, HTTP/SSL, SMTP) now have the
  same set of connection options:
    . connect_ip (new to TCP, HTTP)
    . connect_port
    . bindto
    . bind_port (new)
    . connect_timeout (new to SMTP)
  All of them are optional with reasonable defaults. The patch
  is designed for simplicity in adding a new option. Since the
  connect_ip could be inequal to the RS address and, worse, the
  same for all RSes, the endpoint is now logged as [RS]:rport,
  not the [connect_ip]:connect_port. (Alexey Andriyanov)
* check : fwmark connection option. (Alexey Andriyanov)
* check : make SO_MARK a compile-time option.
  (Alexey Andriyanov)
* check : documentation for generic connection opts.
  (Alexey Andriyanov)
* check : random delay before doing the first check.
  every RS check is registered with a random delay between 0
  and vs->delay_loop seconds. It helps avoiding multiple
  simultaneous checks to the same RS server.  (Alexey Andriyanov)
* vrrp : Fix sync of interface status flag when using VMAC
  interface. There is a chance that the VMAC interface status
  flags (up/down) could be different from the base interface flags.
  This patch will only change the VMAC interface status flags when
  the base interface is changed. (Jonas Johansson)
* vrrp : Let only base interface change the VMAC interface status
  flags. The interface status flags for a VMAC interface shall
  only be changed by the base interface, never by reading the
  actual VMAC interface flags. (Jonas Johansson)
* vrrp : Fix initial interface status flag value for VMAC
  interface. In commit a05a503, "vrrp: Fix sync of interface
  status flag when using VMAC interface", no inital value for the
  VMAC interface status flag was set. Due to that the VMAC interface
  flags shall follow the base interface, the base interface status
  flags value shall be copied to the VMAC interface status flags
  after the VMAC interface has been created. (Jonas Johansson)
* vrrp : Proper restore of VMAC interface properties on SIGHUP.
  On SIGHUP the VMAC flag and base ifindex for a VMAC interface was
  lost. (Jonas Johansson)
* vrrp : Revert "Honor preempt_delay setting on startup.".
  This commit resulted in two individual bugs:

  1) A keepalived instance coming on-line would not transition to
     MASTER state until the preempt_delay duration had passed, even
     though there was no already existing VRRP speaker in MASTER
     state on the link. In other words, it changed the semantics of
     preempt_delay from a delay that only took place before
     *preemption* of another VRRP speaker, to a delay that
     unconditionally took place after Keepalived came online. The
     keepalived.conf manual page has always documented the former
     meaning, which is also IMHO the only one that you would
     intuitively expect.

  2) The preempt_delay was applied when a Keepalived process was
     reloading its configuration following the recipt of SIGHUP.
     If the Keepalived instance was in MASTER state before the
     reload, it would cease transmitting VRRP hellos for the
     duration of preempt_delay, but *not* actually remove the
     virtual addresses from the network interfaces. This in turn
     resulted in any backup VRRP speakers on the links transition
     to the MASTER state while preempt_delay was still in effect
     on the original MASTER that was reloaded, thus creating a
     service-impacting split-brain scenario where the virtual
     addresses are present and active on multiple VRRP speakers

  (Tore Anderson)
* vrrp : fix ip_address comparison. Extend IP_ISEQ() macro to
  take care of NULL addresses. This issue end on SEGV while
  using virtual_route. thanks to Tore Anderson for reporting.
* vrrp : fix double close issue (DROP_MEMBERSHIP & netlink
  channel). This is a old pending 'bug', not arming at all
  but just frustrating to see again and again this log message :

  "cant do IP_DROP_MEMBERSHIP errno=Bad file descriptor (9)"

  What the hell ! it was due to a double close during reload &
  stop procedure. VRRP fd are stored in a socket pool and use
  the I/O MUX to handle VRRP traffic. While reloading or stopping
  the daemon the I/O MUX was released first and secondly socket
  pool.  The issue spotted here, in thread_destroy_master() all
  pending thread are canceled and read/write fds related are
  close(). Well OK a close on a mcast socket perform kernel side
  the DROP_MEMBERSHIP when needed, but it is much more clean to
  perform proper operations userspace ! This patch sequencely
  cancel pending thread, release socket pool and finally
  destroy master thread. Same 'issue' appear in netlink channel.
Release 1.2.12
* lib: Fix reallocation issue introduced in last merge.
Release 1.2.11
* ipvs: make nlerr2syserr libnl dependent. nlerr2syserr()
  is only used when libnl is present... simply reflect this in
* Fix libnl/libnl-3 logic in configure script.
  This patch causes the configure script to prefer libnl-3 over
  libnl(1). The configure script will first check for libnl-3 and
  libnl-genl-3. If both are found, use them. If not, check for
  libnl(1). This is useful when building on systems that have both
  libnl-3 and libnl(1) installed. It also fixes some redundant
  libraries in LIBS.
* libipvs: libnl-3 include fix.
* lib: extend command lib string parser.
  Extend cmd_make_strvec to support quoted string as a single slot
  and commented string at the end of parsed string.
* lib: cosmetics at command.c.
  Extend command framework to support logger and remove some dead
  code. some cosmetics too.
* lib: extend vty to support logger.
* autoconf: better libnl3 detection.
* Fix memory allocation in parser. The set_value function was
  incorrectly using sizeof (char *) when allocation and reallocating
* Fix memory allocation for MD5 digest.
  The vrrp_in_chk_ipsecah and vrrp_build_ipsecah functions were
  incorrectly using sizeof (unsigned char *) when allocating memory
  for the MD5 digest.
* Fix memory leak in vty_read_config. If vty_use_backup_config
  returns NULL, free any memory that has been allocated before
* Fix memory leak in check_include. The check_include function
  should always free the allocated strvec.
* Check content length before allocating memory.
  Since extract_content_length should return 0 if CONTENT_LENGTH is
  not found in the buffer, this check should be done before
  allocating memory. This avoids unnecessary malloc/free calls and
  fixes a potential memory leak.
* Free memory if realloc fails in vty_out. If realloc returns NULL,
  free the original memory before returning.
* Remove redundant close from vty_use_backup_config. The sav file
  descriptor is closed after read, so there is no need to close it
  again is chmod operation fails.
* Remove unnecessary netlink rtattr structures.
  Both netlink_link_setmode and netlink_link_add_vmac have rtattr
  structures that are no needed. The addattr_l function will handle
  adding the rtattr to the message. Also, this patch removes
  incorrect void pointer arithmetic when setting rta_len.
* vrrp: dont try to leave mcast group in unicast mode.
* vrrp: Release and refresh properly fd hash index.
  Rehashing into the same loop as releasing is not really the best
  idea... Reworked a little previous patch to properly release hash
  entries related to the same instance and then hash it back on new
* vrrp: use configuration mcast group for leave message.
* vrrp: dont try to load ip_vs module when not needed.
Release 1.2.10
* Jonas Johansson removed unused option character in getopt
* vrrp: disable TTL sanity check for unicast use-case.
  In order to protect against any packet injection, VRRP provides
  sanity check over IP header TTL. This TTL MUST be equal to
  255 and means both sender and receiver are attached on the same
  ethernet segment. Now with unicast extension this protection MUST
  be disabled since VRRP adverts will mostly traverse different
  network segments.
  !!! WARNING !!! When using VRRP in unicast use-case in order to
  protect against any packet injection the best practice is to use
  IPSEC-AH auth method otherwise you are exposed to potential
  attackers !
* Christian Albrecht fixed minor typo in man page
* Pim van den Berg work on libipvs-2.6 to sync with libipvs from
  ipvsadm 1.27
* Pim van den Berg work add support to libnk >= 3.
* Pim van den Berg extended libipvs adding nlerr2syserr function
  to translate libnl 3 errors to sys errors. In libnl 3 the return
  codes have changed. nlerr2syserr translates the libnl 3 errors to
  sys errors.
* ipvs: if libnl-3 is installed then check for libnl-gen-3. It is
  mandatory to use generic netlink facilities in new libipvs. This
  test is just here to ensure every needed libs are installed !
* Frank Baalbergen (I suppose github frankbb is you ?) fix
  http checker. literal ipv6 addresses should be enclosed by
* vrrp: Frank Baalbergen add check on IFA_F_NODAD support.
* vrrp: fix unicast handling address selection. SjonHortensius
  reported issue while testing unicast_peer. It wouldn't work
  without adding the native_ipv6 flag. Removed this dependency !
  since it not correlated with VRRP protocol version used.
* vrrp: extend ip parser to support default and default6.
  When you are using virtual_routes you may want to use default
  or default6 while configuring routes. Extended parser
  accordingly !
* vrrp: take care of label while comparing IP addresses.
  Label was not taken into account while comparing 2 IP
  addresses, this can lead to a non deletion while stopping
  daemon and some configuration changes have been done while
  deamon running. This issue was reported by Stepan Rogov.
* vrrp: fix/extend gratuitous ARP handling.
  multiple people reported issues where MASTER didnt recover
  properly after outage due to no gratuitous ARP sent. VRRP
  is a protocol designed to be used between node plugged on
  the same layer2 in order to guarantee link failure is directly
  linked to a protocol FSM handling (FAULT transition). With
  current virtualization env quite every think can be virtualized
  from host (VM) to network (vswitch). In some cases those
  virtualized env offer a virtualized layer2 on which VRRP is
  plugged and sometime forwarding or routing over this virtual
  path can be broken.
  I extended gratuitous ARP handling in 2 ways :
  1) When a MASTER receive a higher prio advert it sends a last
     advert before transiting to BACKUP state. The immediate
     effect at remote MASTER side is to sollicite a gratuitous
     ARP broadcast.
  2) Add an optional support to periodic gratuitous ARP sending
     while in MASTER state. By default it is disabled but one
     can activate this feature by configuring keyword
     "garp_master_refresh" in seconds in vrrp_instance block
     (refer to keepalived.conf.SYNOPSIS).
* Frank Baalbergen fixed genhash. genhash can throw a
  segmentation fault when not providing an argument
* Frank Baalbergen extended genhash code to support IPv6
* Frank Baalbergen extended genhash code to make url default
  value /, same as curl/wget
* Frank Baalbergen extended genhash code to only use default
  url when url is empty
* vrrp: Create configuration alias for unicast_src_ip keyword.
  Add a new keyword more generic to specify VRRP packet source
  IP address. This new keyword is "unicast_src_ip" and have
  exactly the same scope as "mcast_src_ip".
* vrrp: unicast_peer addresses and VRRP instance MUST be of
  the same family. VRRP low-level framework create socket
  pool based on VRRP instance family. If you are using
  unicast_peer, it is mandatory to use addresses of same family
  as VRRP instance. You cant mix IPv4 and IPv6 addresses inside
  same unicast_peer block.  If you need to make it that way, you
  MUST create a VRRP instance per family, eg: one with native_ipv6
  for v6 unicast_peer and another for v4 unicast_peer.
* vrrp: extended unicast code to support IPv6 unicast_src_ip.
  Add support to unicast IPv6 address for
  {unicast,mcast}_src_ip keyword. vrrp instance saddr is now a
  sockaddr_storage and src IPv6 address is set using cmsg ancillary
  data pktinfo. TSource IP address selection is now generic and
  can be IPv4 or IPv6.
* vrrp: fix vrrp socket sync while leaving FAULT state.
  Well, this is a very, VERY old bug here. while leaving FAULT
  state VRRP framework refresh instance socket fd_in & fd_out
  and synchronize all VRRP instance bound to the same socket.
  The patch refresh socket, it also refresh fd hashing ! which
  better for later fault handling :)
* vrrp: Frank Baalbergen fix log-facility handling. log-facility
  should be a required_argument
* vrrp: Support xmit VRRP packets from base VMAC interface.
  Here is a merge of patch from Oliver Smith. Thanks for your
  job and idea in here Oliver. Comments from Olivier :

  This provides a new option to use in conjunction with the VMAC
  functionality which will result in VRRP advertisements being
  sent and received over the underlying interface (and therefore
  having the source MAC of that interface rather than the VMAC

  With this new functionality enabled, VRRP messages will not
  affect the switch MAC address table since the non-unique VMAC
  address is now used only for sending a gratuitous ARP, thereby
  ensuring that in conditions of VRRP message loss, a probing
  partner will not inadvertently take over traffic.

  This also resolves issues where VRRP messages are not
  successfully being seen on the VMAC interface as with the
  new option, the underlying interface is also used to listen out
  for VRRP messages.
* getopt: Make some arguments required
* vrrp: Frank Baalbergen add default case in getopt_long.
  when starting keepalived with an option without an argument
  that requires an argument keepalived should not be started.
* vrrp: VMAC code cleanup and extensions.
  Remastered VMAC code. Interface base_ifindex is set by default
  to interface ifindex during netlink probe. VMAC interface
  base_ifindex is now set during VMAC allocation uppon success
  interface creation. Detect if virtual_router_id is declared
  after use_mvac keyword is invoked. Add some more log while
  setting up and removing VMAC interface.
* vrrp: IPv4 and IPv6 multicast group tweaking.
  Meno Abels extended vrrp framework to support customized
  multicast addresses. The address could be set for ipv4 and
  ipv6 in the global_defs config section using the keywords
  vrrp_mcast_group4 and vrrp_mcast_group6.

  There are some stupid switches which does a special processing
  to multicast packets which causes packets drop from
  queue overflows in environments which creates 100 and more
  multicast control plane packets a second.
Release 1.2.9
* Alexey Andriyanov fixed inaccuracy in VS_ISEQ macro.
* Alexey Andriyanov fixed hysteresis which could be >= quorum now.
* Alexey Andriyanov extended checker framework so that status_code
  and digest can be set together.
* Alexey Andriyanov extended/fixed checker framework for better
  SIGHUP support.
* Jonas Johansson fixed VRRP sync group by sending prio 0 when
  entering FAULT state. This fix will send prio 0 (VRRP_PRIO_STOP)
  when the VRRP router transists from MASTER to FAULT state. This
  will make a sync group leave the MASTER state more quickly by
  notifying the backup router(s) instead of having them to wait
  for time out.
* Jonas Johansson extended VRRP VMAC interface flags (up/down
  status) to follow base interface. When using a VMAC interface,
  this fix will reflect the base interface flags, i.e. up/down
  status, to the VMAC interface. This is useful when using sync
  groups (in combination with VMAC) and a link for one of the
  members in the MASTER sync group goes down. Before this fix,
  this member will not detect the link fault, due to that the
  VMAC interface always is UP regardless of the actual status of
  the base interface, and the sync group will continue to be
  MASTER as if nothing has happend. This fix will however reflect
  the status of the base interface onto the VMAC interface, so if
  the link goes down the member will transit to FAULT state, which
  will make the sync group transit to BACKUP state.
* Jonas Johansson fixed VRRP wrong interface flags corner case.
  If a link event arrives between the initial scanning for
  interfaces and configuration file parsing, the VRRP instance
  will enter an unrecoverable state. This fix will update the
  interface flags even when the interface exists, not only for
  the inital scan.  Note that when all is up and running the link
  events will be properly handled by netlink, so this fix only
  fixes the special case when a link changes state during
* Jonas Johansson fixed VRRP to honor preempt_delay setting on
  startup. If the preempt_delay is set we cannot yet transition
  to master state. We must await the timeout of our preempt_delay.
  The preemption delay is used when starting up, or rebooting, a
  node which needs time to sort out its routing table (e.g., BGP
  or OSPF) before it can assume the master role.
* Jonas Johansson extended VRRP code for faster sync group
* Jonas Johansson replaced popt with getopt. In a embedded
  environment you might not want to have to add yet another
  library dependency. This commit refactors parse_cmdline() to
  use getopt_long() instead och popt.
* EyckWigo proposed to increase defaut socket buf size to handle
  env with lot of IP addresses, Default is now set to 64K on netlink
* Guðmundur Bjarni Ólafsson fixed VRRP unicast code to allow
  packet to be routed !
* Guðmundur Bjarni Ólafsson fixed VRRP checksum before computation.
  When running in unicast mode with multiple peers, the checksum
  was being calculated into itself for consequent peers, causing
  incorrect checksums.
* Extended VRRP framework tweaking IPv6 VIP install by disabling
  DAD algo and setting deprecated.
  Lot of discussions have been made around those 2 topics. First
  idea and initial patch where provided by Leo Baltus. This patch
  fix the use case where VRRP VIPv6 are used in conjonction of IPVS
  healthchecking. If deprecated flag is not set (which is the default
  linux behaviour), then VRRP VIP can be used as source address of
  healthcheking packet. Since this VIP address is also present, in
  most use-cases, on realserver directly so return packets never reach
  the healthchecker and hence no realserver was injected in IPVS table.
  At the same time, I decided to merge Tore Anderson  suggestion of
  disabling Duplicate Address Detection algorithm. Tore's arguments
  are nice ! Thanks Tore : Using the nodad flag has the following
  1) The address becomes immediately usable after they're configured.
  2) In the case of a temporary layer-2 / split-brain problem we can
     avoid that the active VIP transitions into the dadfailed phase
     and stays there forever - leaving us without service. HA/VRRP
     setups have their own "DAD"-like functionality, so it's not
     really needed from the IPv6 stack.

  Acknowledgements to Mark Schouten and Frank Baalbergen for pushing
  me by testing this feature !
Release 1.2.8
* Vincent Bernat fixed issue while pinging master agent.
  The agent needs to be initialized to be able to change the
  AgentX ping interval.
* Revisited the whole code to use posix declaration style.
* fixed some typos
* Created CLI core framework.
* Ryan O'Hara added option to prevent respawn of child process.
  This patch adds a command-line option (--dont-respawn, -R) that
  will prevent the child processes from respawning. When this
  option is specified, if either the checker or vrrp child
  processes exit the parent process will raise the SIGTERM signal
  and exit.
* Ryan O'Hara removed duplicate command-line option code.
  patch removes unnecessary code to process command-line
  options. All options can be processed with a single while loop
  that calls poptGetNextOpt. This patch also adds code to check
  for errors while processing options. Note that errors encountered
  while processing command-line options are fatal.
* Ryan O'Hara add support to usage generation by popt.
  This patch uses the popt library to describe the command-line
  options and print usage to stderr. This provides a more clear,
  concise usage statement.
* Ryan O'Hara and I updated keepalived man page.
* Aleksei Ilin add flexible HTTP checker behaviour for HTTP GET
  request's port settings. VirtualServer's port being specified
  in HTTP GET request only if `VirtualHost` option is not defined,
  otherwise used `VirtualHost` option itself.
* Ryan O'Hara fixed pointer arithmetic for VRRP packet.
  When using IPSEC AH authentication, the pointer arithmetic used
  to get the location of the VRRP packet is incorrect. The address
  of the IPSEC header must be cast as (char *) in order to get
  correct address of the VRRP packet. Without this patch,
  vrrp_in_chk() will fail to verify incoming VRRP packets when
  IPSEC AH is enabled.
* Ryan O'Hara fixed issue while loading SSL certificate.
  This patch fixes a problem where keepalived will attempt to
  load an SSL keyfile as a certificate, resulting in failure to
  initialize SSL context.
* Ryan O'Hara refreshed GPLv2 license with last FSF file.
* junpei-yoshino fixed Library crypt is needed.
* Boon Ang fixed comparison of primary IP addresses.
  If a router in the master state receives an advertisement
  with priority equal to the local priority, it must also
  The code to handle this was comparing two IP addresses with
  different byte-ordering, resulting in multiple routers in
  the master state. This patches resolves the problem by
  coverting the local primary IP address to network byte order
  for the comparison.
* Henrique Mecking fixed memory leak in libipvs
* Robert James Hernandez fixed RETVAL by setting RETVAL for
  status instead keeping RETVAL set to default of 0
* Robert James Hernandez fixed RETVAL by setting RETVAL for
  catch all and so that it exits like all other matches in
  the case
* Jan Pokorný fixed genhash to ensure CLRF{2} HTML body
  separator won't slip.
* Jan Pokorný extended genhash. Generalize the hash algoi
  parts, add SHA1.
  This patch adds support for hash algo suite extension
  with SHA1 being a first one to be available together with
  a default MD5.  The remaining change on the health-checker
  subsystem side is to make analogous modifications and to teach
  it to recognize the intended hash algorithm based on the length
  of the digest (provided that extra care is taken that no two
  algorithms will ever alias in this regard).  Also the test
  script for genhash was extended to conditionally use SHA1.
* Jan Pokorný cleaned up genhash code. 
  Access to the hash-specific context was simplified as I've
  now checked some C guarantees regarding union/it's members
  initial address vs. aligning so now extra inlined accessor
  function is needed.  This simplified the code a bit.
  Also now the hash-specific object is directly pointed to by
  SOCK object instead of carrying just the index to the table of
  hashes and doing the respective access via a global again and
  again.  Next, I've concentrated some hash-related declarations
  to the new hash.h file.  This was mostly motivated by a need to
  break the circular include dependency that have arisen. As a
  consequence, part of the recent clutter I brought in was removed
  again. Most of FEAT_SHA1 conditional compilation is here.
  Previously separated table in main carrying the hash IDs to be
  printed in the help screen was merged into the table carrying all
  the other necessary information about the particular hashes.
* vrrp: Remi Gacogne fixed invalid use of sizeof.
* Pasi Kärkkäinen Add To header for SMTP alerts.
* vrrp: Robert Sander add IPv6 support for virtual_routes and
* Erik de Groot add support to LVS One-Packet Scheduling
  (known as OPS). Typically RADIUS traffic comes from a limited
  amount of clients and thus you have a very limited range of IP
  tuples in action which will never expire. Issue with Keepalived
  without this patch is that, although it correctly re-assigns
  traffic when a real server dies, it will never re-assign traffic
  back to the real server when it is restored. This is because
  LVS creates virtual connections, for each IP tuple, that will
  never time out as the clients keep sending traffic to the server.
  With this patch is is possible to enable OPS for UDP virtual
  servers which means LVS does not create virtual connections and
  takes a new loadbalancing decision for each UDP packet. The
  result is that a restored server now gets RADIUS traffic as
  soon as LVS has taken it it back into the server pool.
* Willy Tarreau and Ryan O'Hara add the ability to use VRRP over
  unicast. Unicast IP addresses may be specified for each VRRP
  instance with the 'unicast_peer' configuration keyword. When
  a VRRP instance has one or more unicast IP address defined,
  VRRP advertisements will be sent to each of those addresses.
  Unicast IP addresses may be either IPv4 or IPv6.
  If you are planing to use this option, ensure every ip
  addresses present in unicast_peer configuration block do not
  belong to the same router/box. Otherwise it will generate
  duplicate packet at reception point.
Release 1.2.7
* vrrp: fix issue in while using vrrp_script.
  Previous patch introduced by Ryan O'Hara about removing
  shadow declaration was kind of too much hunting.
  Removing element e in this block simply create inconsitency
  in upper list walk. So resurected element declaration with e2.
* snmp: Mikhail Gaydamaka extended MIB and both vrrp and check
  frameworkds to support routerId to var bind.
* snmp: Mikhail Gaydamaka fixed oid for vrrpSyncGroupStateChange
  var bind.
* some cosmetics again and again.
Release 1.2.6
* Rename global config data variable 'global_data'.
  From Ryan O'Hara :
  This patch renames the global configuration data
  variable from 'data' to 'global_data'. Three reasons for
  renaming this varibale:
  - Fixes shadow declaration of 'data' in several locations.
  - Is more consistent with other global data variables
  (ie. vrrp_data, check_data).
  - Functions like free_global_data and dump_global_data were
  ignoring conf_data_t argument and using global variable
* Ryan O'Hara: Fix shadow declaration of 'vrrp_data' variable.
* Ryan O'Hara: Fix shadow declaration of 'check_data' variable.
* Ryan O'Hara: Remove shadow declaration of 'element e' in
* check: Avoid the use of kernel defines in libipvs userland
* vrrp: Correctly handle macvlan interface when config file is
  re-loaded. From Bob Gilligan :
  Testing with the 1.2.0 branch, bring keepalived up with a
  vrrp_instance that is configured with use_vmac.  Then delete
  that vrrp_instance from the config file.  Then tell keepalived
  to re-read its config file with SIGHUP.  The vrrp_instance will
  be stopped, but the macvlan interface will remain.  The obvious
  fix would be to add code to call netlink_link_del_vmac() in
  clear_diff_vrrp().  There's one problem with that: the code
  needs the ifindex of the macvlan interface to delete it, but
  that resides in the interface structure that was freed earlier
  in the reload process.  My fix is to add a field to the
  vrrp_rt struct to remember the macvlan ifindex.  This patch
  addresses this problem plus two others that can occur in
  reloading the config file:  1) If the vrrp_instance
  configuration is kept, but the use_vmac entry is removed, the
  macvlan interface will not be deleted; 2) If a vrrp_instance
  with use_vmac is left unchanged, the code will attempt to
  re-create the macvlan interface, but this will fail and the
  program will end up not using the macvlan interface.
* vrrp: VRRP should notify other routers before it does any
  action that effects traffic flow. From John Southworth:
  Move the shutdown_vrrp_instances code to before the deletion
  of sock_pool. Move sending priority 0 adverts to before address
  removal occurs
* vrrp: From John Southworth: Stop timers before shutting down
  vrrp instances. This is to avoid a possible condition where
  a priority 0 advertisement is sent and before the master
  thread is killed another advertisement can be generated and sent.
* vrrp: Change when socket fd's are freed.
  From John Southworth:
  Priority 0 advertisements were not being sent as desired on
  config reload. This was causing long delays on manually failed
  over instances. The socket pool was being freed too early, as a
  result the file descriptor for the socket was no longer valid at
  the time the priority 0 advertisment was attempted.
* vrrp: Added a separate timeout parameter for vrrp_script checks
  From Jonathan Harden:
  I've added a timeout parameter to the vrrp check scripts which
  allow you to have the check timeout different to the interval.
  When no timeout has been specified the interval is used (which
  mimics the current behaviour).  To explain the reasoning: We
  wanted to have check scripts time out faster than our check
  interval. Doing the check we need to perform is a little load
  intensive and so we don't want to perform it every few seconds.
  With this patch we set an interval of 60 seconds but a timeout
  of 5 seconds (if the check takes more than a few seconds then
  the service is not working correctly).
* Extended vector lib for futur work
* some cosmetics.
Release 1.2.5
* Merge SNMP support from Vincent Bernat.
* SNMP is not compiled nor activated by default.
* Updated autoconf script
* Created Keepalived MIB
* Integration of NetSNMP into main scheduling loop
* vrrp: Most internal data can be queried with SNMP.
* check: Most internal values can be queried using SNMP.
  The main exception is the ability to query checkers
  which is not present.
* check: SNMP support for IPVS stats. IPVS stats are
  exported with SNMP. A cache is used to avoid to query
  the kernel too much.
* Created core framework for SNMP trap
* vrrp: SNMP traps are sent when instance state changes
  and when sync group state changes
* check: SNMP traprs are sent when real server state changes
  and when virtual server quorum state changes
* vrrp: add support to write/update operations from SNMP.
  Write/update support is available for changing the base priority
  and for changing instance preemption.
* check: add support to write/update operations from SNMP.
  Write support is available for changing the weight of a real
* workaround for AgentX ping blocking Keepalived. When establishing
  AgentX session with the master agent, we setup low timeout and
  retries values. If the master agent is blocked, we will wait for
  less than 1 second for them and therefore, there will be no
  disruption for VRRP.
* Copyright update
* some cosmetics.
Release 1.2.4
* Please look at git repo for credits.
* remove CR from manpage
* check: fix pid display in syslog messages
* vrrp: better documentation of the limitation on password
* cosmetics to be pleasant with GCC4
* Update autoconf script to properly detect VRRP VMAC
* security: Fix exploitable issue in sighandler !
* Add datarootdir to files.
* Fix logging to console.
* Remove newlines from log_message calls.
Release 1.2.3
* Please look at git repo for credits.
* VRRP : allow group to use priority with 'global_tracking'
  group keyword
* VRRP : Adjust TOS values. The TOS value used by other
  vendors is ip precedence 6, so change that. Use socket
  priority option to force packets into band 0 of pfifo_fast.
* VRRP : Fix sync-group thrashing.The sync group implementation
  was not very robust. If one synced instance lost communication
  without going to fault state then all synced intances would
  transition to master. Following this all instances would
  transition back to backup because they heard higher priority
  advertisements. This thrashing would continue indefinitely.
  To fix this the sync-group code was made to prefer backup state.
  That is, the sync-groups don't sync to master state unless
  every instance wants to be master.
* VRRP : Fix dst lladdr in IPv6 Unsollicited NA.
* VRRP : fix pid display in syslog messages.
* Fix configure script to correctly identify kernel version.
* check : handle unspecified sockaddr_storage when comparing
* VRRP : ensure VRRP script interval and GARP delay is not 0.
* check: ensure non 0 default values for timeouts.
* VRRP : Fix priority not changing on reload.
* check : Fix IPv4 address comparison routine.
* Don't use bind() with AF_UNSPEC.
* check : enable the use of fwmark with IPv6 virtual servers.
* Fix modprobe arguments.
* Fix double ntohs() in SMTP checker.
* Pretty-print IP:port as [%s]:%d.
* check : keep retry in case of early TCP failures in checks.
* when specifying an IPv6 range, range is hexadecimal value.
* Only define kernel types for ip_vs.h header to avoid problems
  when loading other headers.
* When respawning VRRP or check process, use LOG_ALERT.
* Do not set reload flag in the main process.
* Set correct rights on PID file.
* fix 'gratuitous' typos.
* ipvs: don't include linux/types.h or asm/types.h.
* configure: check for nl_socket_modify_cb for libnl.
* configure: don't check for IPVS support with kernel 2.6.x.
* VRRP : On shutdown, release sockets later to be able to send
  shutdown packet.
* fix documentation on linkbeat_use_polling keyword.
* Fix a typo for healthchecker.
* fix syslog message if bogous vrrp packet (wrong auth type)
* manpage update.
Release 1.2.2 | IPv6 Ready
* IPv6 : extended autoconf script to support libnl detection.
  IPv6 IPVS kernel subsystem is reachable through
  generic netlink configuration interface.
* IPv6 : Enhanced libipvs-2.6 to support generic netlink
  configuration interface. If generic netlink is
  available with kernel then it will be the
  prefered path to configure IPVS.
* IPv6 : Enhanced the whole checker API to use
* IPv6 : Enhanced the whole core framework to use
* IPv6 : Enhanced all checkers to use sockaddr_storage.
* fixed a long time pending issue in all checkers. If
  first connection attempt to remote peer was failing
  no more check was performed to service... Up on error
  connecting remote peer simply register a new timer for
  next check. This is specially needed in IPv6 context
  where a unreachable host can be reached at delayed time.
* code clean-up: revisited the code to use more POSIX
  compliant declaration. thread typedef to use thread_t
  instead. revisisted checker framework to use POSIX typdef
Release 1.2.1 | Bugfixes
* Vincent Bernat <bernat <at>> :
  VRRP: Fix incorrect computation for packet size
* Vincent Bernat <bernat <at>> :
  VRRP: handle passwords up to 8 characters
* Vincent Bernat <bernat <at>> :
  When updating weight, check quorum state.
  MISC check can update the weight of a real server. This
  can lead to a change in quorum state.
  We factor out quorum handling from perform_svr_state()
  into a new function update_quorum_state() that will check if
  the quorum state changed and if yes, update sorry server status,
  exec quorum commands and add back or remove alive real servers
  (with existing function perform_quorum_state()).
  This patch is mostly cut'n'paste and adding a call to
  update_quorum_state() in update_svr_wgt(). We also make
  perform_svr_state() and update_quorum_state() almost symmetric.
* Vincent Bernat <bernat <at>> :
  Fix an infinite loop in master transition with sync groups.
  This patch is from Arjan Filius. See:
  When transitioning to master state, keepalived might try to
  force transition to master state of other VRRP instances into
  the same group before their transition is complete. This leads
  to an infinite loop with huge VRRP trafic.
* Vincent Bernat <bernat <at>> :
  VRRP : Use VRRP_PRIO_DFL instead of 100 for default priority.
* Vincent Bernat <bernat <at>> :
  Use netpacket/packet.h instead of linux/if_packet.h to get
  linux/if_packet.h pulls linux/types.h that should not be used
  by a userland program since types defined here can conflict
  with stdint.h. We use netpacket/packet.h which is a GNU LibC
* Vincent Bernat <bernat <at>> :
  Keep current weight on reload when initial weight is not
  Weight can be changed by MISC_CHECK when using dynamic option.
  In case of reload, the change is lost until the script runs
  again. We record the initial weight in a separate variable and
  use it to check if a real server has changed instead of using
  the actual weight.
* Vincent Bernat <bernat <at>> :
  VRRP : disabled scripts and initially good scripts should be
  considered as OK.
  When a script is not weighted, its failure will lead to a
  failure of the associated VRRP instance. However, disabled
  script and scripts that are initially good (after a reload)
  should be considered as successful and not make the instance
  fail.  Moreover, a disabled script should not be used when
  computing script weights.
* Vincent Bernat <bernat <at>> :
  VRRP : more informative message when disabling a script due
  to use of weights.
  When using a weight for a tracked script, the script is
  disabled.  However, the warning message said that the weight
  was ignored. We change the message to tell that the script is
  ignored. Moreover, we don't change its weight since it can be
  used in another instance, not in a SYNC group.
* Vincent Bernat <bernat <at>> :
  check : include missing virtual server group name in a log
* Vincent Bernat <bernat <at>> :
  configure: add a check for ETHERTYPE_IPV6.
  ETHERTYPE_IPV6 defined in net/ethernet.h is pretty recent.
  If absent, we hard-code the value into CFLAGS. This patch
  requires regeneration of configure.
* Vincent Bernat <bernat <at>> :
  check : update server weight in IPVS only if server is alive
  and in the pool.
  With inhibit_on_failure, a server can be in the pool and not
  alive. We don't want to set the weight of an inhibited server
  or a server in a virtual server whose qorum is not met yet.
* Vincent Bernat <bernat <at>> :
  check: really add back inhibited server when quorum is gained
  A previous change contained an erroneous check to add back
  alive servers when quorum state was gained. This check was
  incompatible with inhibit_on_failure. When servers were added
  back in the pool, the weight was not updated accordingly.
* Vincent Bernat <bernat <at>> :
  check : update server weight despite quorum when no sorry
  In absence of a sorry server, the logic is to not use quorum
  except to run commands when quorum is gained or lost. This
  means that if a MISC check modifies the weight of a server
  and there is no sorry server, we do not consider quorum.
Release 1.2.0 | VRRP IPv6 Release
* Branch 1.2.0 created. This branch will host all new
  developments on Keepalived. New code will be added
  in here only.
* VRRP : Add support to IPv6 protocol. The global framework
  has been extended to support this branch new family !
* VRRP : Implement IPv6 Neighbour Discovery protocol (NDISC).
  In IPv6 gratuitous ARP doesnt exist since ARP is IPv4 only.
  NDISC can provide the same feature by sending so called
  Unsolicited Neighbour Advertisement. A node can send such a
  protocol datagram in order to (unreliable) propagate new
  information quickly (rfc4861.4.4). NDISC build an ICMPv6
  message with taget link-layer address option, this option is
  set icmp6_override flag to indicate that advertisement should
  override an existing cache entry and update the cached
* VRRP : Extend ip address framework to be IPv4 and IPv6
  independant. An ip address, as defined in framework, is
  now {IPv4,broadcast} or {IPv6}. Use struct ifaddrmsg to
  store and prepare netlink related operation. This clean-
  -up the code.
* VRRP : Extend parser to support IPv6 declarations. IPv6
  and IPv4 addresses can be configured inside the same
  configuration block (eg: virtual_ipaddress or
  virtual_ipaddress_excluded). An instance can run IPv4 and
  IPv6 addresses at a time, this can be useful in dual-stack
  env (since this will become certainly the most common use
  case in the next years).
* VRRP : Extend netlink framwork to support IPv6 addresses
  interactions (reflection/addition/deletion).
* VRRP : Extend finite state machine support IPv4 & IPv6
  at a time.
* VRRP : Extend protocol helpers to support IPv6 multicast
  related. AF_INET6 SOCK_RAW tweaking it done through
  socket API instead of PF_PACKET header building... This
  makes code cleaner.
* VRRP : Set default VRRP instance protocol to be IPv4.
  you can use configuration keyword "native_ipv6" inside
  vrrp_instance configuration block to specify that you
  want to use IPv6 for VRRP multicasting protocol instead.
* VRRP : Extend socket option related helpers to support
  IPv6 specifics.
* VRRP : Extend protocol scheduler and dispatcher to
  support IPv6.
* VRRP : Extend socket pool to keep track of socket
* VRRP : Cleanup protocol offset pointer by removing
  duplication code...
* VRRP : some code clean-up...
Release 1.1.20 | Bugfixes
* Vincent Bernat <bernat <at>> extended ip/route
  framework to be able to add route or ip address if they
  already exist.
* Vincent Bernat <bernat <at>> fixed broadcast
  address display.
* Vincent Bernat <bernat <at>> extended genhash to
  display an error when giving an incorrect IP address.
* Vincent Bernat <bernat <at>> When parsing
  "blackhole" route, also parse IP mask.
* Vincent Bernat <bernat <at>>
  On reload, destroy signal pipes before recreating them.
* Vincent Bernat <bernat <at>>
  Fix SMTP checker adding himself repeatedly in the list of
  failed checkers.
* Vincent Bernat <bernat <at>>
  Handle non-existant default interface in VIP definition.
* Vincent Bernat <bernat <at>>
  Remove alive real servers when quorum is lost.
* Vincent Bernat <bernat <at>>
  Fix a segfault when a virtual_server is empty.
* Vincent Bernat <bernat <at>>
  Add real servers to new member of a virtual server group
  on reload.
* Vincent Bernat <bernat <at>>
  Keep previous effective VRRP priority on reload.
* Vincent Bernat <bernat <at>>
  Fix VRRP script not running any more after reload.
* Vincent Bernat <bernat <at>>
  On reload, keep status for all VRRP scripts.
* Removed IPVS Kernel 2.2 support
Release 1.1.19 | Bugfixes
* Cosmetics changes.
* Vincent Bernat <bernat <at>> fix a segfault
  when there is no real server for a virtual server.
* Vincent Bernat <bernat <at>> Willy Tarreau
  and I finally fixed SIGCHLD handling upon reload.
* Vincent Bernat <bernat <at>> fix VS_ISEQ macro.
* VRRP : Kimitoshi Takahashi <ktaka <at>>
  fixed nopreempt from FAULT state. The owner of higher
  priority in FAULT state shouldn't preempt current MASTER
  when it's recovering, if the nopreempt option is set.
Release 1.1.18 | Bugfixes
* Fixed compilation warnings
* Updated autoconf kernel version detection. Created a new
  configuration option to force kernel versioni selection.
  This option can be useful for crosscompilation:
* Updated media link failure detection strategy. Kernel
  linkwatch has been around for long time so set it as
  default strategy. Alternatively you can choose to use
  MII BSMR polling strategy by adding new keyword
  'vrrp_linkbeat_use_polling' in your configuration file.
* Vincent Bernat <bernat <at>> fixed ip_vs.h includes.
* Removed vrrp_running and check_running test since it is
  already performed by keepalived_running.
* Properly handle father pidfile handling.
* fixed reload handler to properly print out PID.
* Willy and I fixed a signal handling issue while reloading
  daemon. A dereferencing master thread issue leading to a
  segfault, so that reload was seen as a restart because it
  was respawned by keepalived father process.
* Willy fixed a missing UNSET_RELOAD declaration leading to
  a potential infinite loop while performing reload.
* Vincent Bernat <bernat <at>> fixed initial value
  of quorum state on startup and reload. Fixed sorry server
  removal to consider quorum state.
* VRRP : Add missing notify calls while entering FAULT state.
* VRRP : Willy added support to delayed script check launch
  (up and down). It defines "rise" and "fall" keywords. "fall"
  defines the required number of failures to switch in KO mode,
  "rise" defines the number of sucesses to switch in OK mode.
* VRRP : Fixed an IP_DROP_MEMBERSHIP issue while performing
  reload. vrrp socket pool is released at first.
Release 1.1.17 | Bugfixes
* Fixed low-level scheduler timer computation to take care to
  monothonic computation. Select returns if timer is null!
* VRRP : Fixed vrrp script initialization to use event thread
  instead of timer thread so that script no longer need to
  wait until first polling timer fired.
* VRRP : Willy and I fixed MII media link failure detection
  to test SIOCGMIIREG call before fetching BMSR.
* VRRP : Resurected VRRP_STATE_GOTO_FAULT. This state is
  really needed to speed-up convergence and prevent against
  any issue while using vrrp_sync_group.
Release 1.1.16 | Bugfixes
* Code clean-up.
* Stefan Rompf, <stefan at> extended scheduler to
  synchronize signal handling by sending the signal number through
  a self pipe, making signals select()able. Child reaping has been
  moved to a simple signal synchronous signal handler. Signal
  shutdown handling has been centralized.
* Denis Ovsienko, <pilot at> extended healthchecker
  framework to support alpha/omega design. It provides virtual
  service control in a more fine-graned maner. You may have a
  look to the SYNOPSIS file to have full picture on configation.
  It addresses the following issues :
  - A virtual service is considered up even with an empty RS pool.
  - There is no reliable mean to avoid service regression, when
    the server pool becomes too small.
  - There is no mean to escalate any of the above fault/recovery
  - Real servers are assumed alive initially. This leads to
    unnecessary state flap on keepalived start.
  - notify_down isn't executed for working real servers on
    keepalived shutdown.
  - There is no reliable mean to handle keepalived stop to move
    the virtual service over another load balancer.
* Stephan Mayr, <Mayr.Stefan at> fixed default value for
  checker loop... a missing TIMER_HZ.
* Merge keepalived.init.suse.
* Robin Garner, <robin.garner at> added support to
  --log-console facility.
* Tobias Klausmann, <klausman at> fixed an openfile
  leak while performing reload.
* Leo Baltus, <Leo.Baltus at> extended pidfile handling
  to allow keepalived to start using configurated pidfile.
* VRRP : Siim Poder, <siim at> fixed IPSEC AH auth
  to skip IPv4 id field of zero. If zeroed kernel will fill it
  and lead to an unwanted protocol re-election.
* VRRP : Siim Poder, <siim at> fixed reloading issue.
  New ip addresses are added (from configuration). State is kept
  instead of starting from whatever is in configuration file.
  If prios are changed in such a way, state change can occur after
* VRRP : Vincent Bernat, <bernat at> extended virtual_route
  to support virtual "black hole" route as well as multihop route.
* VRRP : Stig Thormodsrud, <stig at> fixed a crash while
  using virtual_router_id set to 255.
* VRRP: Jon DeVree, <jadevree at> fixed arp handling to
  to initialize the target hardware address, using 0xff as found
  in arping. Let scripts work without dealing with weight, if the
  script fails, VRRP fails.
* VRRP : Pierre-Yves Ritschard, <pierre-yves at> removed
  the GOTO_FAULT state from FSM.
* VRRP : Willy Tarreau, <w at> fixed link detection handling
  to support right ioctl values for recent kernel ! It can lead
  to issue while running instance on a bonding interface.
* VRRP : Willy Tarreau, <w at> extended scheduler to catch
  time drift. It implements an internal monotonic clock. It
  maintains an offset between sysclock and monotonic clock, if
  computed time if anterior to monotonic time then just update
  offset. If time computed if fare away into the future then
  limit delay and recompute offset.
* VRRP : Willy Tarreau, <w at> fixed autoconf issues.
Release 1.1.15 | Bugfixes
* Matthias Saou, <matthias at> fixed genhash
  Makefile for man page installation.
* Casey Zacek, <keepalived at> provided a patch
  to check_http to remove buffer minimization while processing
  stream. It appears some webserver cause healthchecker crash.
* Chris Marchesi, <chris.marchesi at> provided
  a patch for better handling of SSL handshake errors.
* Shinji Tanaka, <stanaka at> fixed parser "include" 
  directive to support declaration inside configuration directives,
  like including file inside vrrp_instance declaration.
* Andreas Kotes, <count at> fixed HTTP healthchecker
  while handling MD5SUM result. It appears checker never removed
  realserver on MD5SUM mismatch !!! whats that crap.
* VRRP : Willy Tarreau, <w at> fixed a missing notifications
  upon transition from fault to backup.
* VRRP : Add support to route metric in virtual_routes definition.
Release 1.1.14 | Enhancements
* Shinji Tanaka, <stanaka at> extended parsing
  framework to support "include" directives. For more
  informations and documentation please refer to  Shinji website
* Tobias Klausmann, <klausman at> add error loggin
  while parsing configuration file.
* Merged patches from on Makefile and redhat specfile.
* Create a goodies directory to store nice scripts received from
  users. Add Steve Milton <milton AT> arpreset script
  to delete a single ARP entry from a CISCO router.
* VRRP : David Woodhouse, <dwmw2 at> fixed vrrp_arp
* VRRP : Pierre-Yves Ritschard, <pyr at> fixed negative
  weights in script.
* VRRP : Michael Smith, <msmith at> extended
  virtual_ipaddress setting to support Old-style Linux interface
  aliases like eth0:1.
* VRRP : Ward Wouts, <ward.wouts at> add support to
  vrrp_script logging.
Release 1.1.13 | Enhancements
* VRRP : Added a new notify script to be launch during vrrp
  instances shutdown. This new notify hook is configured
  using notify_stop keyword inside vrrp_instance block.
* VRRP : Willy Tarreau <w at> fixed an errno issue in
  thread_fetch(), errno is lost during set_time_now(). This
  patch saves it across the call to set_time_now() in order
  to get the valid error.
* VRRP : Willy Tarreau <w at> extended timer framework
  to save errno in timer_now() and set_time_now() just in
  case other functions do not expect these functions to modify
  it. This is a safer approach than the initial patch to
  thread_fetch(), while still compatible.
* VRRP : Willy Tarreau <w at> fixed an FSM silent issue.
  By default, the VRRP daemon stops sending during new MASTER
  elections. This causes 3 to 4 seconds of silence depending on
  the local priority, and sometimes causes flapping when the
  differences in priorities are very low, due to the kernel timer's
  resolution : sometimes, the old master receives a first
  advertisement, enters backup, waits 3 seconds, sees nothing and
  finally becomes master again, which forces a new reelection on
  the other one.
* VRRP : Willy Tarreau <w at> extended VRRP framework to
  support floating priority. Replace the priority in each
  vrrp_instance with a base priority and an effective priority,
  to prepare the support for floating priorities. The configuration
  sets the base_priority, and all comparisons use the new
  effective_priority value. This one is computed in the
  vrrp_update_priority() thread by adding an offset to base_priority,
  based on the result of various checks.
* VRRP : Willy Tarreau <w at> extended notify script to add
  the priority in "$4" when calling a notify script. This is
  important in labs and datacenters when systems can display the
  priority on a front LCD, because it allows workers to carefully
  operate without causing unexpected reelections.
* VRRP : Willy Tarreau <w at> extended interface tracking
  framework to let interface tracking change the priority by adding
  a "weight" parameter. If the weight is positive, it will be added
  to the priority when the interface is UP. If the weight is negative,
  it will be subtracted from the priority when the interface is down.
  If the weight is zero (default), a down interface will switch the
  instance to the FAULT state.
* VRRP : Willy Tarreau <w at> added a new "vrrp_script" section
  to monitor local processes or do any type of local processing to
  decide whether the machine is in good enough health to be elected
  as master. A same script will be run once for all instances which
  monitor it. If no instance use it, it will not be run, so that it's
  safe to declare a lot of useful scripts. A weight is associated to
  the script result. If the weight is positive, it will be added to
  the priority when the result is OK (exit 0). If the weight is
  negative, it will be subtracted from the priority when the result
  is KO (exit != 0). If the weight is zero, the script will not be
  monitored. The default value is 2.
* VRRP : Willy Tarreau <w at> extended vrrp scheduler so that
  when a VRRP is part of a SYNC group, it must not use floating
  priorities, otherwise this may lead to infinite re-election after
  every advertisement because some VRRPs will announce higher prios
  than the peer, while others will announce lower prios. The solution
  is to set all weights to 0 to enable standard interface tracking,
  and to disable the update prio thread if VRRP SYNC is enabled on a
* VRRP : Willy Tarreau <w at> added some documentation and
  examples for the brand new VRRP tracking mechanisms.
* VRRP : Ranko Zivojnovic, <ranko at> fixed vrrp
  scheduler to execute notify* scripts in transition from the
  failed state to the backup state.
* Nick Couchman, <nick.couchman at>, added support for
  real server upper and lower thresholds.  This allows you to set
  a minimum and maximum number of connections to each real server
  using the "uthreshold" (maximum) and "lthreshold" (minimum)
  options in the real_server section of the configuration file.
* Chris Caputo, <ccaputo at> extended autoconf script
  to support recent move of UTS_RELEASE from linux/version.h to
* Chris Caputo, <ccaputo at> extended ipvswrapper 2.4
  code to support misc_dynamic weight.
Release 1.1.12 | Bugfixes
* VRRP : Christophe Varoqui, <Christophe.Varoqui<at>> extended
  VRRP framework to use virtual_router_id as syncid in LVS mcast
  datagram while using LVS syncd in VRRP instance.
* Kevin Lindsay, <kevinl<at>> and Christophe Varoqui,
  <Christophe.Varoqui<at>> fixed SSL checker to properly
  use openssl when dealing with asynchronous stream handling.
  Kevin fixed asynchronous handling during connection stage
  while Christophe fixed stream handling after connection stage.
* Kjetil Torgrim Homme, <kjetilho<at>> extended keepalived
  spec file to cleanly compile on RedHat enterprise 3 and 4.
* Heinz Knutzen, <Heinz.Knutzen<at>> fixed SMTP checker
  to overwrite default_host while parsing configuration file.
  A SMTP_CHECK without a "host" section should use the ip of the
  current real server as default.
Release 1.1.11 | Bugfixes
* VRRP : extended ipaddress and iproutes code to return
  if vip or vroutes is referencing an unknown interface.
* Kevin Lindsay, <kevinl <at> netnation <dot> com> and I fixed a
  missing bitwise negation while removing signal from
  global signal mask. Set this operation before handler
  is called. This assume that bitwise negation is an
  atomic code generated from compiler. Since gcc 3.3
  this is true.
* Asier Llano Palacios, <a <dot> llano <at> usyscom <dot> com> extended
  autoconf script to support cross-compilation.
Release 1.1.10 | Bugfixes
* VRRP : While restoring interface, release iproutes
  before ipaddresses. Routing daemons needs that order
  for netlink reflection channel.
* VRRP : Bin Guo, <bguo<at>bluesocket<dot>com> fixed a memory
  leak while calling script_open.
* Kevin Lindsay, <kevinl <at> netnation <dot> com> fixed some buffer
  overruns, NULL pointer and dangling pointer references.
* Kevin Lindsay, <kevinl <at> netnation <dot> com> redisigned signal
  handling. When a signal occurs, a global signal_mask is
  modified. In the main loop there is a checked to see if
  the signal_mask has any pending signals. The appropriate
  signal handler is then run at this time. This is to prevent
  races when modifying linked lists.
* Kevin Lindsay, <kevinl <at> netnation <dot> com> fixed shadowed
* Christophe Varoqui, <Christophe<dot>Varoqui<at>free<dot>fr> and I
  Extended libipvs-2.6 to support syncd zombies handling.
  Since ip_vs_sync.c kernel code no longer handle waitpid()
  we fork a child before any ipvs syncd operation in order
  to workaround zombies generation.
* John Ferlito, <johnf<at>inodes<dot>org> and I Fixed a scheduling
  race condition while working with low timers.
* Updated check_http and check_ssl to use non-blocking
* Fixed some race conditions while reloading configuration.
  Prevent against list gardening if list is empty !
* Fixed recursive configuration parsing function to be clean
  with stack. Only one recursion level.
* Some cosmetics cleanup in Makefiles.
Release 1.1.9 | Bugfixes
* VRRP : Chris Caputo, <ccaputo <at> alt <dot> net> updated keepalvied
  manpage for nopreemept and preempt_delay.
* VRRP : Fixed an issue while releasing vrrp socket pool... Just
  release pool one time !
* VRRP : Fixed netlink framework to properly save netlink socket flags
  while setting blocking flags.
* VRRP : Fixed a regression introduced with previous release while
  hashing vrrp fd bucket into fd hash index.
* Patrick Boutilier, <boutilpj <at> ednet <dot> <ns> ca> fixed an issue in the
  extract_html function. Read the full html header.
* Chris Caputo, <ccaputo <at> alt <dot> net> and I fixed compilation issue
  while using --enable-debug configuration option.
* Extended both VRRP and Healthchecker framework to support
  debugging flags.
* Removed the watchdog framework. Since scheduling framework
  support child, we register a child thread for both process
  VRRP and Healthcheck. When child die or stop prematuraly this
  launch scheduling callback previously registered. Watchdog
  is now handled by signaling.
  (credit goes to Kevin Lindsay, <kevinl <at> netnation <dot> com> for nice
* Some cosmetics cleanup.
Release 1.1.8 | Enhancements
* VRRP : Chris Caputo, <ccaputo <at> alt <dot> net> added "dont_track_primary"
  vrrp_instance keyword which tells keepalived to ignore VRRP
  interface faults. Can be useful on setup where two routers
  are connected directly to each other on the interface used
  for VRRP. Without this feature the link down caused
  by one router crashing would also inspire the other router to lose
 (or not gain) MASTER state, since it was also tracking link status.
* VRRP : Chris Caputo, <ccaputo <at> alt <dot> net> added "nopreempt" which
  overrides the VRRP RFC preemption default. This replaces the
  "preempt" keyword which was not fully implemented. "preempt" is
  kept around for backward compatibility but is deprecated.
* VRRP : Chris Caputo, <ccaputo <at> alt <dot> net> added "preempt_delay" which
  allows one to specify number of seconds after startup until VRRP
  preemption. (range 0 to 1,000 seconds) this is useful because
  sometimes when a machine recovers it takes a while for it to become
  usable, such as when it is a router and BGP sessions need to come
  back up.
* Chris Caputo, <ccaputo <at> alt <dot> net> made it so there is a useful "Date:"
  in SMTP alert emails.
* VRRP : Chris Caputo, <ccaputo <at> alt <dot> net>. In debug output log
  gratuitous ARPs with actual IP addresses being ARPed.
* VRRP : Chris Caputo, <ccaputo <at> alt <dot> net>. If started with
  "--dont-release-vrrp" then try to remove addresses even if we didn't
  add them during the current run, when it makes sense to do so.
* VRRP : Chris Caputo, <ccaputo <at> alt <dot> net> added a missing
  free_vrrp_buffer() during VRRP stop.
* VRRP : Kees Bos, <k.bos <at> zx <dot> nl> fixed VRRP sanity check to perform
  checksum computation over incoming packet and not local router
  instance memory representation => Better to log 'invalid vip
  count' instead of 'Invalid vrrp checksum' when the number of
  configured vips differ in the master and backup server :)
* VRRP : Release socket pool during daemon stop and reload
* VRRP : Refresh socket pool during reload
* VRRP : Extended netlink framework to support blocking
  operation. During initialization, set blocking netlink channel
  to wait responses from kernel while parsing result. Kernel netlink
  reflection are still handled using non-blocking.
* Jeremy Rumpf, <rumpf.6 <at> osu <dot> edu> added SMTP checker. It take
  a special care of smtp server return code.
* Merged genhash man page
* Chris Caputo, <ccaputo <at> alt <dot> net> added "misc_dynamic" to a
  MISC_CHECK which makes it so a script can adjust the weight of
  a real server.
* Fixed some assertion issue in memory framework.
* Use router_id instead of lvs_id in the global_def configuration
  block (lvs_id kept for backward compatibility).
* Ronald Wahl <rwa <at> peppercon <dot> com>, fixed declarations to be only
  in includes files.
* Ronald Wahl <rwa <at> peppercon <dot> com>, moved the definition of variables
 to C files
* Ronald Wahl <rwa <at> peppercon <dot> com> and I fixed scanning for header/body
  separator in HTTP protocol
* Ronald Wahl <rwa <at> peppercon <dot> com> replaced memcpy by memmove where source
  & destination may overlap
* Extended checker API to only register checkers when checker callback
  is defined.
* Jacob Rief, <jacob.rief <at> tiscover <dot> com> fixed openlog to take care
  of configured log facility.
* Move in_csum to util file.
* Extended libraries to support some new facilities (list and vector).
* Extended scheduler I/O to use timer decalred on the stack.
* Some cosmetics changes.

Release 1.1.7 | Minor Bug Fixes
* Jacob Rief, <jacob.rief <at> tiscover <dot> com> added target tarball into
root Makefile to facilitate packaging (rpm & tarball).
* Jacob Rief, <jacob.rief <at> tiscover <dot> com> and I unified version
handling. Now only the root file VERSION is used by configure
included into the VERSION_STRING that reflect the building
date into the version banner.
* Andres Salomon, <dilinger <at> voxel <dot> net> wrote the genhash manpage.
* VRRP : Added ipvs_start() and ipvs_stop() calls during vrrp child
start and stop stage.
* Added some assertion test in memory framework to not allocate
bucket if no more place. This option is only used if compiled
with debug flags.
* Some cosmetics patch in Makefiles and autoconf script.
Release 1.1.6 | Bug Fixes
* VRRP : Fixed scheduling timer update. Global scheduling timer is
updated before each thread registering and after scheduling I/O MUX.
Since is needed to take care of scheduling jitter introduced by
overhead (VRRP is using low low timer so more sensitive to overhead).
Thanks to Nathan Neulinger, <nneul <at> umr <dot> edu> for his quick feedback
debugging time.
* VRRP : Nathan Neulinger, <nneul <at> umr <dot> edu> updated vrrp dropping
strategy to not reply to incoming bogus adverts. Since this can
introduce flooding loop, bogus adverts are now simply silently
* VRRP : Fixed a linkbeat issue while polling NIC flags.
* Updated autoconf and Makefile to support 2.6 kernel IPVS code. For
code readability, created 2 differents libipvs for 2.4 and 2.6 kernel
. Fixed autoconf generated warning.
* Extended ipvswrapper to support shared buffer user rule. This
increase performances by limiting memory allocation. OTOH, created
two new ipvs helpers ipvs_start & ipvs_stop to initialize ipvs
* Andres Salomon, <dilinger <at> voxel <dot> net> made some cosmetics update
in Makefiles to support $(DESTDIR) and $(BIN)/$(EXEC) path split.
Release 1.1.5 | Enhancements
* Joseph Mack, <mack <dot> joseph <at> epa <dot> gov> wrote
  keeplived manpages in doc/man/man5/keepalived.conf.5 and
* VRRP : Tsuji Akira, <tsuji <at> centurysys <dot> co <dot> jp> fixed a length issue while testing password field for auth_pass method.
* VRRP : Willy Tarreau, <willy <at> w <dot> ods <dot> org> fixed a quick loop in the watchdog timer thread.
* VRRP : Willy Tarreau, <willy <at> w <dot> ods <dot> org> extended scheduler to support stable scheduling time. There is now, only one time source updated before and after scheduling event. This
solve sliding timer observed on some env, also known as
periodically flapping issue (sometime a VRRP election is
* VRRP : Willy Tarreau, <willy <at> w <dot> ods <dot> org> updated the default media link failure detection strategy to perform a ioctl ifflags even if NIC driver are supporting MII or ETHTOOL. Some buggy drivers need this. Anyway the linkwatch patch still the best solution to support efficient and scalable media link failure detection.
* Some cosmetics clean-up, removed some dead files, updated
autoconf and Makefile prototypes to support dependencies
libs like kerberos for RedHat/Fedora distro. To compile
keepalived properly on redhat 9 box, for example, run :
CPPFLAGS="-I/usr/kerberos/include" && ./configure
Renamed keywords lb_kind to lvs_method and ld_algo to
lvs_sched. For compatibility reasons, old keywords are still
Release 1.1.4 | Enhancements
* Refresh autoconf script to use autoconf 2.5.
* Extended the autoconf script to support linkwatch kernel
* To work-around the SMP forking bug, added support to two
  new daemon starting options :
  --vrrp               -P    Only run with VRRP subsystem.
  --check              -C    Only run with Health-checker
  Those options extend daemon design to support VRRP &
  heathchecking subsystem selection. You can now run
  two Keepalived daemon one invoqued with --vrrp and
  the other with --check. That way we workaround the
  forking issue by running one daemon per subsystem.
* Tiddy cleanup in the daemon code.
* VRRP : Extended the link media failure detection to support
  asynchronous NIC MII polling. The design use now, one
  dedicated polling thread per NIC. This reduce scheduling
  jitter by this way.
* VRRP : Added support to kernel linkwatch subsystem. This
  patch that you will find a copy on the Keepalived website
  for the kernel 2.4 branch, provides kernel netlink broadcast
  events drived by NIC link media state event. That way
  we move from a polling design to an event design. Link
  events are received throught a kernel netlink broadcast
  socket in the userspace land. So, NIC media link failure
  detection is now provided by kernel netlink reflection.
  You can read the paper attached with the patch for
  indepth explanations.
* VRRP : fixed timer computation to prevent against negative
Release 1.1.3 | Enhancements
* Stephan von Krawczynski, <skraw <at> ithnet <dot> com> extended
  ip address framework to support broadcast address selection.
* Extended the scheduling framework to support plain 'long'
timer. Visited the layer4 framework to support this new
scheduling scheme. Reviewed the checkers and VRRP framework
to support long timer.
* VRRP : Removed the timer micro adjust call. Its use is
obsolete with the new scheduling 'long' timer support.
* Jacob Rief, <> and I added support
log level selection for main daemon. A new command line
argument has been created :
--log-facility -S 0-7 Set syslog facility to
LOG_LOCAL[0-7]. (default=LOG_DAEMON)
* Extended the HTTP checker to support non blocking read
while processing stream. NONBLOCK flags is set before
read operation to catch EAGAIN error.
* VRRP : Diego Rivera, <lrivera <at> racsa <dot> co <dot> cr> and I fixed a notify issue while building notify exec string.
* VRRP : Diego Rivera, <lrivera <at> racsa <dot> co <dot> cr> and I extended FSM to support BACKUP state notifiers and smtp_alert call during VRRP initialization.
* Jan Vanhercke, <jan <dot> vanhercke <at> c <dash> cure <dot> be> and I extended scheduling timer computation to support micro-sec second overlap. Extended the whole scheduling framework to support
this scheduling scheme while computing thread timers.
* Fixed scheduling framework to support child thread timers
while computing global scheduling timer.
Release 1.1.2 | Enhancements
* Dominik Vogt, <dominik.vogt <at>> and I extended checker
  framework to support multiple checkers per realserver.
  Each checker own a uniq id, each realserver own a list
  of checkers id. Realserver is considered down if one of the
  checkers fails.
* Dominik Vogt, <dominik.vogt <at>> extended list library to
  support free_list_element.
* Dominik Vogt, <dominik.vogt <at>> and I extended ipwrapper
  to support multiple checkers test. Created a checker state
  updater helper function to perform realserver state according
  to checker state.
* Dominik Vogt, <dominik.vogt <at>> extended all checkers
  code to support multiple checker design (to not perform
  server state according a single checkers test).
* Tobias Klausmann, <klausman <at>> and I extended
  layer4 framework to support socket binding to a specific
  ip address before calling connect(). Extended the TCP, HTTP
  and SSL checker to support binding selection, creating
  a new checker keyword named "bindto".
  look at doc/keepalived.conf.SYNOPSIS for more informations.
* VRRP : Extended the ethtool code to be selected only if
  ETHTOOL_GLINK is available. This is useful for s/390 zSeries
  users :) since zSerie 2.4 kernel doesn't support ethtool
* VRRP : Gatis Peisenieks, <gatis <at>> fixed IPSEC-AH
  code to exclude ip header id filed while computing AH digest.
  Fixed AH sequence number to be set in network byte order.
* VRRP : Fixed a bug in the static_ipaddress block that caused
  a noisy crashing startup.
* VRRP : Kjetil Torgrim Homme, <kjetilho <at>> and I
  fixed a daemon crash while reloading configuration due to a
  vrrp_buffer not freed.
* VRRP : Review the watchdog calling location. watchdog listener
  is reinitialized during a daemon reload.
* VRRP : Diego Rivera, <lrivera <at>> extended notify
  framework to support simple notify script call. Created a new
  keyword "notify", for both vrrp_instance and vrrp_sync_group.
  If configured, this notify script is called after FSM state
  transition notify scripts.
  look at doc/keepalived.conf.SYNOPSIS for more informations.
* Review the checker watchdog calling location like VRRP.
* Fixed code selection to exclude VRRP dependencies if code is
  configured without VRRP framework.
* Extended memory lib free function to reset memory location to
* Diego Rivera, <lrivera <at>> extended global parser
  to support default handlers for lvs_id, smtp_server,
  smtp_connection_timeout and email_from. default values are :
   o lvs_id : box local name
   o smtp_server : localhost
   o email_from : uid@box_local_name
   o smtp_connection_timeout : 30s
Release 1.1.1 | Bug fixes
* VRRP : Fixed an issue while reloading configuration. Fixed 
a dereferencing pointer.
* Fixed misc checker to perform server state according to
checker result !!!
Release 1.1.0 | High Performance
* The release focus is : "High Performance"
* Name cleanup for the healthchecking directory. use check
instead of healthcheck to be in conformance with watchdog and
global software architecture.
* updated the SYNOPSIS file for documenting the table arg inside
virtual/static_routes declaration. You can set routes refering
to a specific TABLE-ID.
* Added a dummy debug var in the genhash declaration code to
support compilation when compilation is done with debug flag.
* Added a set flag inside the real_server declaration correctly
relfect the IPVS topology when inhibit_on_failure is used.
* fixed a daemon.h include depandency on signal.h
* VRRP : Added support to a global shared buffer for incoming
advert handling. A new buffer is no longer allocated each time
processing incoming advert, instead a shared room is used.
* VRRP : Added support to pre-allocated shared buffer for
outgoing adverts. Each vrrp instance use a 'one time'
allocated buffer instead of a 'all time' one.
* VRRP : Extended the socket pool design to support shared fd
for the outbound channel. Now, socket pool create a sending
socket and affect the fd returned to vrrp instances. This
forces instances to use a shared socket instead of creating
new socket for each outgoing adverts. The error detection
is based on the incoming socket, so that outgoing socket is
not created as long as incoming socket can not be created.
* Added support to netlink ipaddress as global keyword
look at doc/samples/keepalived.conf.static_ipaddress.
IP addresses specified into this block will be added during
daemon bootstrap and removed during daemon shutdown.
Differential conf parsing is enabled for this block,
removing/adding static_ipaddress can be done on the fly
sending SIGHUP signal to daemon.
* VRRP : Extended track_interface to support multiple interface
tracking. For those familiar with Nokia monitored circuit,
this extention provide the same functionality.
look at doc/samples/keepalived.conf.track_interface. * VRRP : The VRRP instance lookup framework has been extended
to use a o(1) scheduling design. Rewrote the whole instance
lookup to use o(1) lookup instead of previous o(n^2). When
receiving incoming adverts vrrp_scheduler performs a lookup
over the VRID received to get local instance representation.
Since the internal instance representation is an non-sorted
linked list, then we run a lookup at o(n^2) complexity that
introduce lantency and scheduling jitter side effect when
runing large number of instances. To avoid this limitation
a static hash table of 255 buckets were created. Since
lookup is performed over VRID and since VRID is 8bit fixed,
then the hashkey will be VRID. In order to extend code the
hashkey is based on incoming fd too. Internally, a NIC is
represented by a 2 fds : sending socket and receiving socket.
Those fds are NIC specific so we are using them as a hash
table lookup collision resolver. With this design we can now
use the same VRID on different NICs. The collision design
is a linked list so lookup is o(n^2) but due to low number
of entries we can consider o(1) speed. But to reach best
perf, differents VRID on all instance must be used. The
design can be sumed by :
  VRID hash table :
     | 1 | 2 | 3 | 4 | 5 | 6 |.........| 255 |
           |       |
         +---+   +---+
         |fd3|   |fd1|
         +---+   +---+
  This hash table is filled during configuration parsing and
  VRRP instances are not duplicated but dynamically pointed
  to optimize memory.
* VRRP : The VRRP synchronization group lookup has been
extended. During bootstrap a VRRP instance index is built upon
sync_group instance name. This extension speed up
synchronization since while synchronizing it perfoms the
instance index instead of lookup by instance_name. The
previous synchornization code has been rewritten to use this
'list visiting' design for FAULT/BACKUP/MASTER states
* VRRP : Optimized the vrrp_timer_vrid_timeout(...) to speed
up vrid lookup over timeouted fd using a one pass lookup.
* Bradley Baetz, <bradley.baetz <at>> extended
the scheduler framework to support child process handling.
Adding support to new thread child facility for handling
child processes, and modifying the scheduling select
loop & signal handling to catch SIGCHLD, and call the
appropriate process.
* Bradley Baetz, <bradley.baetz <at>> fixed
the misc_check healthchecker using new thread child
scheduling facility. Introduced a new keyword
"misc_timeout" to kill processes which take too long
time (default is delay_loop). SIGKILL is send to processes
if they take too long time to shutdown.
* Bradley Baetz, <bradley.baetz <at>> extended
daemon framework to block SIGCHLD to only receive it
whn its unblocked in the scheduling loop.
* Extended healthchecker delay_loop to support long
delay (ie: >1000s).
* VRRP : Added support to a shared kernel netlink command
channel for setting ip address and routes.
* Extended the genhash code to support verbose output
selection. command arg '-v' will generate a very verbose
* VRRP : Extended the logging code to select verbose log
output or not. This selection is done by passing the
'-D' option to command line while starting daemon.
By default the output is silent.
* VRRP : Extended the gratuitous ARP framework to support
shared buffer and shared socket. This increase performances
for instances owning a bunch of VIP.
* VRRP : Extended the scheduling timer computation to support
timer auto-recalibrating. While computing next instance
timer, the scheduler will substract the time taken by
previous advert handling. This provide software overhead
adaptation. The recalibration is performed over usec timer
to not pertube global scheduler.
* VRRP : Fixed a gratuitous ARP issue. Extended the
ipaddress framework to point directly to interface
reflected by netlink channel instead of storing device
index. Extended the gratuitous ARP code to use new
ipaddress structure and for sending garp over device
ipaddess belong to. Needed if you run an instance on
one device interface and set VRRP VIP on different
* Extended watchdog framework to support polling delay
selection via daemon command line. Created two new
cmdline options :
--wdog-vrrp -R Define VRRP watchdog polling
delay. (default=5s)
--wdog-check -H Define checkers watchdog
polling delay. (default=5s)
* Extended SMTP code to support bigger buffer while
processing remote mta messages.
* Erik Barker, <erikb <at>> extended initscript
to support native redhat init functions.
* Extended the autoconf scripts and Makefile(s) to support
code profiling. New configure option : --enable-profile
* list library has been extended to support multi-sized list &
specific element deletion. Extended to return when list is
empty. This reduce duplicated code to test is list is empty
while processing.
* VRRP : Extended VRRP scheduler to support fd hash
table design. Speed up instance lookup while
computing instance sands. This offer o(1) design
if we consider limited number of instances per
* VRRP : Extended vrrp new socket creation to replace
refreshed instance fd into fd hash table index.
* VRRP : Extended vrrp framework to support
blank virtual_ipaddress block, can be usefull
if someone want to use just the VRRP advert
as hello monitoring channel.
* Some code cleaning.
Release 1.0.3 | Enhancements
* This release has been sponsorized by :
Tiscover AG, <>
Please visit sponsor homepage. I would just like to thanks
their IT team for interresting design discussions and testing
time, especially Jacob Rief.
* This release consist of a major daemon re-design to increase
security and availability of Keepalived. The daemon has been
split into 3 distinct process. The global design is based
on a minimalistic parent process responsible for monitoring
its forked children process. Then 2 children process, one
responsible for VRRP framework and the other for
healthchecking. Each children process has its own scheduling
I/O multiplexer, that way VRRP scheduling jitter is optimized
since VRRP scheduling must be more sensible than
healthcheckers. On the other hand this split design
minimalize for healthchecking the usage of foreign librairies
and minimalize its own action down to and idle mainloop in
order to avoid malfunctions caused by itself. The parent
process monitoring framework has been called watchdog, the
design is : each children process open an accept unix domain
socket, then while daemon bootstrap, parent process connect to
those unix domain socket and send periodic (5s) hello packets
to children. If parent cannot send hello packet to remote
connected unix domain socket it simply restart children
process. This watchdog design offer 2 benefit, first of all
hello packets sent from parent process to remote connected
children is done throught I/O multiplexer scheduler that way
it can detect deadloop in the children scheduling framework.
The second benefit is brought by the uses of sysV signal to
detect dead children. When running you will see in process
list :
111 keepalived <-- parent process monitoring childs
112 \_ keepalived <-- VRRP children
113 \_ keepalived <-- Healthchecking children * Parent : Created a global data and global keyword parser
* Healthcheck framework : Defined check_conf_data to handle
related checker data structures. Created specific checker
framework parser.
* VRRP framework : Defined vrrp_conf_data to handle related vrrp
data structures. Created specific vrrp framework parser.
* Each child process has its own syslog facility. VRRP use
LOG_LOCAL1 and Healthchecker LOG_LOCAL2. To split log you can
so configure your syslog to log both facilities in a different logfile.
* Modularized the configuration parser to limit code duplication.
* Created modularized software watchdog.
* Extended the recursive stream parser to use sublevel detection
while stream processing. Used to skip end-of-block handling if
still at keyword root level to prevent against end parsing if
unknown block is parsed.
* Extended pidfile framework to be more generic.
* Extended memory framework to log specific child data.
* Fixed a virtual_server_group issue while healthchecker
bringing back real_servers. Modularized virtual_server_group
* Fixed a virtual_server_group issue will reloading
configuration. Remove vsgname test from the VS_ISEQ macro. strcmp(...) comparing null pointer... this must have been done in libc :)
* ipwrapper : set alive flag after ipvs_cmd(...) has been
* VRRP : Extended the netlink framework to support SCOPE
selection for both ipaddress and routes fonctionnalities.
SCOPE available are site, link, host, nowhere & global.
Default value is set to global.
look at doc/keepalived.conf.SYNOPSIS for more informations.
* Renamed doc/samples/keepalived.conf.routes to
* Updated Makefile include dependencies. * Vince Worthington created 'keepalived-lvs-nat-director-proxyarp-firewall-howto'
Release 1.0.2 | Enhancements
* This release has been sponsorized by :
edNET, <>
Please visit sponsor homepage and thanks to them for supporting
keepalived project.
* Added support to virtual_server_group so that a virtual_server
can be either an IP:PORT, a fwmark or group. A group is a set
of virtual_server IP:PORT, IP range and fwmark. So, now a
real_server can be part of multiple virtual_server without launching
multiple time the same healthchecker that finaly flood real_server.
This extension is useful for big ISP/ASP configuration using many
look at doc/samples/keepalived.conf.virtual_server_group.
* Extended differential configuration parser to support diff
virtual_server_group entries keeping current entry state as
persistent (weight, conn, ...) big work here...
* Added support to IP range declaration for virtual_server_group.
The IP range has the notation XXX.YYY.ZZZ.WWW-VVV. This will
set IPVS virtual_server from WWW to VVV monotonaly incremented by
look at doc/samples/keepalived.conf.virtual_server_group.
* Dominik Vogt, <dominik.vogt <at>> enhanced SIGCHLD handler to
reap all zombie child processes.
* Created a generic allocation value block with callback handler for
block parsing. This remove duplicated code in parser.
* VRRP : Jan Holmberg, <jan <at>> extended the virtual_routes
and static_routes to support source route selection (netlink
look at doc/samples/keepalived.conf.routes.
* Some cosmetics patches to reduce code duplication.
Release 1.0.1 | Enhancements
* This release has been sponsorized by :
  Creative Internet Techniques, <>
  Please visit sponsor homepage, open minded people here !
* Fixed some Makefile and autoconf code dependence issues.
* Move keepalived.conf.SYNOPSIS and samples into "doc" directory.
* Enhanced HTTP|SSL check to support large url. Get buffer request is
  now 2KBytes.
* Removed \n in healthchecker smtp_alert call. This cause some troubles
  with MTA like qmail. Thanks go to John Koyle, <jkoyle <at>>.
* Added support to netlink route as global keyword "static_routes".
  look at doc/samples/keepalived.conf.routes. Routes specified into
  this block will be added during daemon bootstrap and removed during
  daemon shutdown. Differential conf parsing is enabled for this block,
  removing/adding static_route can be done on the fly sending SIGHUP
  signal to daemon.
* VRRP : Added support to "virtual_routes". This is the same as
  virtual_address. Those routes are set when VRRP instance enter
  MASTER state and removed otherwise. Differential conf parsing is
  enabled for this block. This concept extend VRRP and bring
  dynamic routing as a "route takeover" concept.
* VRRP : Rewrote the VRRP vip handling to use template lib list
  structure. VIP and E-VIP are no longer a simple array reallocated.
  List library is used to limite code duplication.
* VRRP : Extended virtual_ipaddres and virtual_ipaddress_excluded
  block to support "dev" specification. So that a VIP can be set to
  a specific interface instead of default runing VRRP instance
* VRRP : Added support to "track_interface". Interesting for use with
  vlan interface. The concept here is to drive VRRP FSM according
  do both "interface" and "track_interface" state. If tracked interface
  is down or instance interface is down then VRRP instance transit to
  FAULT state. For use with vlan, add track to interface vlan belong
  to. Look at doc/sample/keepalived.conf.track_interface for sample.
  doc/keepalived.conf.SYNOPSIS for configuration details.
* VRRP : Extended FSM FAULT state to keep in fault if track_interface
  still fault.
* VRRP : Extended sync group design to test if group is unary or not.
* Some code cleaning and cosmetics enhancements.
Release 1.0.0 | STABLE RELEASE
* After fixed all bugs users reported during 2 months, I am glad to
announce the first STABLE production ready Keepalived release.
* Rename keepalived.init to keepalived RedHat startup script. Fixed
some issues to be RedHat release generic. Thanks go to
Jeroen Simonetti <jeroens <at>> & Jason Gilbert <jason <at>>
* Jason Gilbert, <jason <at>> cleaned keepalived.spec.
* Added support to "ha_suspend" for healthcheckers. This option, if set,
inform Keepalived to active/suspend checkers according to netlink
IP address information reflection. If one IP is removed and this is
a virtual_server VIP then the healthcheckers corresponding will be
desactivated. (and reciprocity).
* Added support to "notify_up" & "notify_down" for realserver config.
These options specify a script to be run according to healthchecker
activity. If healthchecking fails then "notify_down" script is
launched (and reciprocity for healthcheck succeed). This can be
usefull for global monitoring system, to send alert to Unicenter TNG
or HPOV.
* Set default realserver weight to 1. So, realserver will be active
if no weight is specified into the configuration file.
* Review the layer4.c/tcp_socket_state to return connection in progress
only if SOL_SOCKET/SO_ERROR return EINPROGRESS. Thanks go to
Mark Weaver, <mark <at>>
* Reviewed the global SIGCHLD handler to not suspend execution of the
calling process if status is not immediately available for one of the
child processes. This remove zombies by reaping.
* Extended the parser.c/set_value() code to accept encapsulated quoted
* Review SMTP DBG() message to LOG_INFO message for more verbose
error handling.
* Review the check_tcp.c/check_http.c logging messages to be more
* Review the check_tcp.c/check_http.c retry facility to fixes some
stalled issues.
* VRRP : Added support to sync_group smtp notification in addition to
the per instances approach.
* VRRP : Fixed some IPSEC-AH seq_num synchronizations issues. Force
seq_num sync if vrrp instance is linked to a group.
* VRRP : In BACKUP state, force a new MASTER election is received adv.
has a lower priority as locale instance.
* VRRP : vrrp.c/vrrp_state_master_rx(), sync IPSEC-AH seq_num counter
(decrement) if receiving higher prio advert in MASTER state.
* VRRP : Reviewed the TSM to be fully filled. Extended speed-up
synchronization handling MASTER sync if group is not already synced.
* VRRP : Leaving fault state, force MASTER transition is received adv
priority is lower than locale.
* VRRP : Extended the parser to not be borred with sync_group
declaration position in the conf file. vrrp_sync_group can be
declared before or after vrrp_instance. Done by adding a reverse
instance lookup during parsing.
* VRRP : sync_master_election cleanup.
* Some cosmetics patches.
* Created the keepalived/samples/keepalived.conf.SYNOPSIS to describe
all keywords available
Release 0.7.6 | Enhancements
* Created a common library for code modularization. This lib will
be used by all Keepalived components (genhash + Keepalived) to
reduce repeated and duplicated code.
* Rewrote the genhash utility using the common lib. The design is
similar to Keepalived core design.
* Reviewed the autoconf and Makefiles for new code architecture.
* Created a html utility lib for HTTP headers manipulations.
* Extended the CHECK_HTTP and CHECK_SSL checkers to support remote
webserver HTTP header status_code. HTTP status_code is parsed
according to rfc2616.6.1. The keyword created for the new feature is
"status_code" inside and "url" declaration. "status_code" feature
can be mixed with "digest" feature. See the samples directory
keepalived/samples/keepalived.conf.status_code for example.
* Review the CHECK_HTTP and CHECK_SSL MD5SUM code to use a common
stream handling function.
* Matthijs van der Klip, <Matthijs.van.der.Klip <at>> and I
fixed a bug into the HTTP/SSL code that close the socket fd even
if remote webserver has not been connected. As a result of fact,
next socket created were imediatly closed. As a side effect, this
altered the SMTP notification when remote webserver checked fall. No
SMTP notification were sent if webserver were detected DOWN. Thanks
to Matthijs for time debugging and investigation.
* VRRP : Rewrote the previous Gratuitous ARP facility. Created a lib
(vrrp_arp.c) dealing with PF_PACKET-SOCK_RAW-ETH_P_RARP and
* VRRP : Some cosmetics patch for messages logging.
* VRRP : Fixed an issue during VRRP packet building, appending VRRP
VIPs to the VRRP packet in the network order form.
* VRRP : Reviewed the previous VRRP packet building process to not
create the ARP header. Removec the previous hacky
kernel appending ARP header since code doesn t currently support
* VRRP : Rewrote the previous vrrp_send_pkt() function to deal with
sendmsg(). optimization lazzyness :)
* VRRP : Extended the interfaces librarie to support common utility
functions (if_setsockopt_hdrincl, if_setsockopt_bindtodevice, ...)
* VRRP : Finally extend the code to support VRRP IPSEC-AH authentication
method. Created a IPSEC-AH seq_number syncrhonization mecanism during
* VRRP : Extended the VRRP TSM to speed up instances syncrhonization
during FAULT->BACKUP & FAULT->MASTER state transition.
* Some cosmetics patches. This release is proposed as a 1.0.0 STABLE
release candidate.
Release 0.7.1 | Enhancements
* Fixed a MISC_CHECK issue when registering next timer checker. Must
register a new timer thread before forking process. This imply for
the user the extra script call must not execute in more than
* Extented the ipfwwrapper (for LVS kernel 2.2) to not set ipchains
rules if nat_mask is not specified in the configuration file.
* VRRP : Added support to delayed gratuitous ARP send. When one instance
enter to MASTER state a timer thread is registered. The default delay
is 5secs. This delay is configurable per vrrp instance and handle the
'garp_master_delay' keyword. This delay refer to the delay after
MASTER state transition we want to launch gratuitous ARP.
* VRRP : Force health checker enable flag if VRRP framework is not
* VRRP : Review the gratuitous ARP helper function to only send
gratuitous ARP if VRRP VIPs are set.
* VRRP : Review the FSM to eliminate stalled flapping loop. The state
transition diagram implemented is :
| | Fault | |
| | | | |
| | V | |
| | | | Initialize | | | |
| | | | | | | |
V | | V V | | V
| Master | | Backup |
The state DUMMY_MASTER state has been removed since it is a fake.
* VRRP : In order to handle all possible state transition, a Transition
State Matrix design (TSM) has been added. This matrix defines
transition state handlers for VRRP sync group extension. The TSM
implemented is (cf: vrrp_scheduler.c for more informations) :
\ E | B | M | F |
S \ | | | |
B | x 1 2 | B: VRRP BACKUP state
------+ | M: VRRP MASTER state
M | 3 x 4 | F: VRRP FAULT state
------+ | S: VRRP start state (before transition)
F | 5 6 x | E: VRRP end state (after transition)
------+-----------------+ [1..6]: Handler functions.
* VRRP : Set ms_down_timer to 3 * advert_int + TIMER_SKEW when leaving
MASTER state.
* VRRP : In MASTER state, when incoming advert match or FAULT state is
requested then force leaving MASTER state transition. (review the
previous election approach).
* VRRP : Optimized the leave FAULT state transition. Directly coded into
the FSM for speed up recovery or code readability.
* VRRP : Extended smtp notifier for BACKUP state. Review the MASTER state
notification to only notify when VIPs are set.
* some cosmetics patches.
* Adam Fletcher, <adamf <at>> created the 'LVS-NAT + Keepalived HOWTO'.
Release 0.6.10 | Bug fixes
* Fixed a faked flag during VRRP VIP set. Updated the IP address set flag to reflect
netlink return code.
* Fixed an autoconf issue during selection of VRRP framework.
Release 0.6.9 | Enhancements
* Fixe some code dependence selection during compilation. If autoconf netlink
probe fails then unset VRRP code.
* Cleanup daemon lib. Added some logging info for the daemon processing, removed
some repeated code part.
* Added 2 new daemon arguments :
--dont-release-vrrp : Dont remove VRRP VIPs on daemon stop
--dont-release-ipvs : Dont remove IPVS topology on daemon stop
* Review the global scheduling process to clear FD queues on master thread
* Fixed a forking issue in the MISC_CHECK.
* Review IPVS wrapper functions to use allocated IPVS rules instead of static
referencing pointer.
* Fixed the IPVS wrapper to delete IPVS entries according to their 'alive' state.
* Added IPVS support to alive flag for VS entries.
* Rewrote the previous main.c to support configuration reload on the fly. Extented
signal handling to register a conf reload_thread on SIGHUP. The software design
used here is a dynamic differential conf file reloading framework. This design
offer key decision to add/remove new/old entries to/from low-level framework:
IPVS topology and netlink IP addresses entries. This design reduce to the max
the global service interruption since only negative diff entries are removed.
For VRRP config reload on the fly, if you plan to add/remove many VIPs consider
VIP declaration into the virtual_ipaddress_excluded since they are not present
into VRRP adverts.
* Review the keepalived.init script to support restart and reload arguments.
* Fixed some typo issues.
Release 0.6.8 | Bug fixes
* Alex Kramarov & Remi Nivet, <Remi.Nivet <at>>
reported an assertion error during smtp notification process. The assertion
caused a bad file descriptor registration during in_progress connection
handling. Fixed registering an event thread calling upper level SMTP
protocol in_progress connection handler. So the SMTP stream handlers use
global I/O multiplexer on connection success.
* Benoit Gaussen, <ben <at>> and I added support to "inhibit" feature.
Added a new keyword called "inhibit_on_failure" for real_server declaration.
If specified the real_server will not be removed from the IPVS topology if
real_server fail according to checker result. Instead of removing the entry
from IPVS topology, the corresponding real_server weight will be set to 0.
When real_server will be back, then weight will be set back to original value.
See sample directory for example.
* Added support to IP_MASQ_CMD_SET_DEST for 2.2 krnl and IP_VS_SO_SET_EDITDEST
for 2.4 IPVS code to provide support to "inhibit" feature.
* Review to exit on compilation error.
* Extended autconf script to check for kernel netlink support.
Release 0.6.7 | Code cleanup
* Rewrote the previous SMTP notification framework. New code use a strong
multi-threaded FSM design.
* Moved the SMTP get_local_name() into utils.c
* IPVS : updated the code to support IPVS_SVC_PERSISTENT_TIMEOUT. Introduced
into the new libipvs coming with ipvs-1.0.4.
* VRRP : Extended the mcast membership subscription to handle more robust
mcast subscription errors. Removed the previous ugly stalling sleeping
call retry for membership subscription. Membership subscriptions are now
multi-threaded to not degrade global scheduling timer.
* VRRP : Remi Nivet, <Remi.Nivet <at>> pointed out a buffer
overflow during the sending advert interface binding process.
* Some more cosmetics patches.
Release 0.6.6 | Code cleanup
* added indentation style
* Review the previous source tree. Split the code into functional subdirs.
Added multi-level automake scripts. The source tree looks like :
|-- bin
|-- genhash
|-- keepalived
| |-- core
| |-- etc
| | |-- init.d
| | `-- keepalived
| |-- healthcheck
| |-- include
| |-- libipfwc
| |-- libipvs
| |-- samples
| `-- vrrp
`-- lib
* Refine autoconf/automake scripts. Added automake support to libipvs and
libipfwc. Added code selection compilation for libipvs and libipfwc.
* Review Makefile(s) to use more convenient facilities like distclean, ...
* Review the Makefile(s) code dependencies.
* Added support to modprobe_ipvs if the ip_vs.o module is not loaded.
If modprobe fails then IPVS is assumed unavailable.
* Refine the IPVS wrapper to be more tolerant. When a VS or RS is already
configured don t stop the daemon. The daemon is stopped only on critical
IPVS errors.
* VRRP : Review the bootstrap sequence to start daemon even if one of the
instance want to run on an interface administratively shut. Added extension
to FSM to force transition to FAULT state during bootstrap if the interface
is shut.
* Updated the TODO file.
* Some cosmetics patches.
Release 0.6.5 | Code cleanup
* Fixed a NULL pointer exception while releasing IPVS entries.
* Review the to fixe some conventional issue. Fixed a libipvs
dependance code selection.
* Christophe Varoqui, <Christophe.Varoqui <at>> created the rpm spec file.
* Roberto Nibali, <ratz <at>> helped during OLS with code cleanup.
Review the whole code coding style to use more conventional indentation. The
one used into LVS and Kernel code. Coding style provided by the following
command :
find . -name "*.[chS]" -exec indent -kr -i8 -ts8 -sob -l80 -ss -bs -psl \
{} \; && find . -name "*~" -exec rm {} \;
* Roberto Nibali and I review the DEBUG logging facility adding global DBG()
func declaration.
* Roberto Nibali fixed two potential buffer overflow (strcpy).
* Richard L. Allbery, <rla <at>> pointed out a fwmark issue.
Healthcheckers is enabled if virtual service is a fwmark.
* Some cosmetics patches.
Release 0.6.4 | Enhancements
* Rewrote the previous ip address utilities functions. Review the string
to ulong convertion function to support CIDR filtering and more simple
handling ("without all hexadecimal and shorthand"), pickted from Paul
Vixie code.
* VRRP : extended the notify framework to support scripts inside a
vrrp_sync_group. view the sample/keepalived.conf.vrrp.sync file.
* VRRP : Review the previous vrrp_sync_group block. New declaration
is : view the sample/keepalived.conf.vrrp.sync file.
* VRRP : fixed a FSM sync_group side effect in FAULT state.
* Fixed a Kernel 2.2 code selection issue (ETHTOOL).
* Added support to wensong libipvs.
* Fixed a sorry_server cleanup side effect.
* Alex Karamasov fine the keepalived.init script
to be compatible with redhat chkconfig.
Release 0.6.3 | Bug fixes
* VRRP : Christian Motelet, <cmotelet <at>> pointed out a
flapping issue when runing vrrp_sync_group on multiple NICs. This have
been fixed adding a leave FAULT state transition on both FSM state (read
& read_to). The group leave fault state if all NICs of each VRRP Instance
are working.
* Fixed some issues in the autoconf/automake scripts.
Release 0.6.2 | Bug fixes
* Andres Salomon, <dilinger <at>> enhanced the autoconf/automake
scripts to be more generic and to facilitate cross compilation. Including
more efficient IPVS code detection, Kernel version, install script
location, ...
* Johannes Erdfelt, <johannes <at>> fixed a genhash get request
length calculation issue.
* Johannes Erdfelt, <johannes <at>> fixed a wrong printed IP address
issue due to a static pivot buffer called multiple times for a single
syslog call.
* Johannes Erdfelt, <johannes <at>> enhanced SMTP notification
framework to use more compliant SMTP protocol handling. Enhanced both
sending and receiving functions. A nice response code buffer handling
calculating remote SMTP server retcode.
* Johannes Erdfelt, <johannes <at>> fixed a NULL pointer exception
into the 2.2 ipvswrapper code.
* Aneesh Kumar, <aneesh.kumar <at>> fixed a compilation issue for
CI-LINUX checker compilation.
* Jan Du Caju, <jan <at>> fixed a compilation dependence
selection into the VRRP framework when compiling without LVS support.
This disable checkers activity update when compiled without LVS support.
* fixed a dereferencing pointer into the parser.
* move the dump configuration to printout conf after daemon initialization.
* VRRP : Added support to start on complete init. VRRP framework and thus
keepalived will start if VRRP instances are properly configured.
Release 0.6.1 | Enhancements
* Aneesh Kumar, <aneesh.kumar <at>> and I added support to
Cluster Infrastructure checkers. Providing HA-LVS for their cluster
project ( The new checker added
provide a derivation to the internal CI healthcheck mechanism.
* Enhanced the Kernel netlink reflector to drive global healthcheckers
activity. The policy implemented here is : If healthchecker is performing
test on a service that belong to a VIP not owned by the director, then
the healthchecker is suspended. This suspend/active state is particulary
usefull if runing VRRP for HA => That way the backup LVS will not charge
the realserver pool since LVS VIP is owned by master LVS.
* Cosmetics patches into the vector lib.
* VRRP : Rewrote the previous VRRP synchronization instance policy.
Created a new config block called "vrrp_sync_group" that define VRRP
instances synchronization dependences. That way we replace the previous
"by-pair" sync approach by this "by-group" approach. This can be useefull
for firewall HA with many NICs. Created a dedicated framework to speed up
takeover synchronization.
* VRRP : Added support to CIDR notation for VRRP VIPs definitions
=> VRRP VIPs definition like a.b.c.d/e. By default "e" value is set to 32.
* VRRP : Added support to multicast source IP address selection
=> "mcast_src_ip" keyword. Can be usefull for strongly filtered env.
The mcast group subscription is done using the NIC default IP after this
mcast_src_ip is used if specified.
* VRRP : Enhanced the link media failure detection. Added support to the
new kernel SIOCETHTOOL probing for ETHTOOL_GLINK command. New drivers
use this ETHTOOL interface to report link failure activity. During
bootstrap a probe is done to determine the proper polling method to
use for link media failure detection. The policy used is : probe for
SIOCGMIIREG if not supported then try SIOCETHTOOL GLINK probe, otherwise
use a ioctl SIOCGIFFLAGS polling function mirroring kernel NIC flags to
localy reflected representation.
* Ramon Kagan, <rkagan <at> YorkU.CA> and I updated the UserGuide.pdf.
Release 0.5.9 | Enhancements
* Added support to realserver_group. The work is not yet finished since
it introduces new compilation design currently not supported. So please
do not use yet. * VRRP : Review the script notification. Moved to a script per VRRP
instance state => Created new keywords notify_backup|master|fault
to run a specific script during backup|master|fault state transition. * VRRP : Added support to quoted strings for notify_backup|master|fault.
Can now launch script passing arguments.
See sample directory for examples.
* VRRP : Added a protocol extension called "virtual_ipaddress_excluded".
This configuration block is similar to "virtual_ipaddress" block =>
those VIPs (called E-VIPs) are set throught netlink kernel channel and
gratuitous arp are sent over each E-VIP. The only difference is that
they are not added into VRRP packet adverts. This can be usefull for
big env where you want to run many VRRP VIPs (200 for example).
VRRP packet lenght are limited to a 20 VIPs, if you want more VRRP VIPs
add them to the "virtual_ipaddress_excluded" configuration block.
* VRRP : Added more logging facility when setting/removings VIPs & E-VIPs.
* VRRP : Created a new FSM state called become_master in charge of
VIPs/E-VIPs/notifications handling. The goto_master state is now a state
where the instance send an advert to force a new MASTER election setting
the instance into a transition mode. If election success its finaly
transit to become_master state to own VIPs/E-VIPs and launch scripts.
* VRRP : Force a new MASTER election when receiving a lower prio advert.
* VRRP : Review the vrrp_scheduler.c to use more conventional FSM design.
This reduce and beautifull the code.
* VRRP : Fixed a very noisy flapping issue observed on heavy loaded env.
Simulating big traffic on a backbone figure out this flapping issue.
Added support to a TIMER_MICRO_ADJUST to prevent against timer degradation.
This can be view as a DOS protection policy. VRRP MASTER timers are adjusted
if they are too degradated, due to heavy loaded networking env introducing
latency receiving/sending VRRP protocol adverts.
Thanks goes to Paul, <xerox <at>> for pointing it out and providing
access to its Internet routing backbone.
Release 0.5.8 | Enhancements
* Added an OpenSSL Licence exception to grant Keepalived compilation
with OpenSSL Toolkit.
Thanks to Andres Salomon, <dilinger <at>> for suggesting.
* Added connection port selection for Healthcheckers (TCP_CHECK,
HTTP|SSL_GET). Can be usefull for Healthcheck in fwmark LVS topology
for grouping service.
Thanks to Richard L. Allbery, <rla <at>> for suggesting.
See samples directory for examples.
* Fixed some IPVS exclusion code when running --disable-lvs.
* Added support to VirtualHost selection when using HTTP|SSL_GET.
See samples directory for examples.
* Added VirtualHost selection into the genhash utility.
* Fixed some IPVS sync daemon initializations issues.
* Cometics patches in IPVS wrapper framework.
* Added support to quoted string. This can be usefull if you are using
MISC_CHECK and you want to pass arguments to called script. See samples.
Thanks to Benoit Gaussen, <ben <at>> for suggesting.
* Prepare work on real_server_group in order to group some realserver
* VRRP : Fixed a password length exception causing an unwanted dropping
* VRRP : Enhanced the MASTER state to send gratuitous arp if receiving
a remote lower prio advert => This fix a remote stalled ARP cache.
Thanks to Simon Kirby, <sim <at>> for discussing this case.
Release 0.5.7 | Enhancements
* Review autoconf/automake scripts to be more generic on system and code
selection. Added primitives (configure) :
--disable-lvs-syncd : Do not use IPVS sync daemon
--disable-lvs : Do not use IPVS framework
--disable-vrrp : Do not use VRRP framework
--enable-debug : Compile with debugging flags * Fixed a SSL stream handling bug.
Thanks to Andres Salomon, <dilinger <at>> for pointing the issue. * Added a global memory counter to track global memory used. * Fixed configuration parser. read_line. Remove static allocated temporary read buffer. Only handle stream if line has been split into vector. * Limit maximum number of VIPs per VRRP Instance to 20. (for fragmentation,
overhead, and others reasons). * Added IPVS wrapper support to persistence granularity. Thanks to Mike Zimmerman, <tarmon <at>> for the suggestion.
* Review smtp notifier to handle VRRP MASTER state transition alert.
Thanks to Paul, <xerox <at>> for the suggestion.
* Review the UserGuide.pdf to fixe some english issues :)
Thanks to Jacques Thomas, <jacktom <at>> for reviewing.
Release 0.5.6 | VRRP Bug fixes
* Review in GOTO_MASTER_STATE the IP address  handling.
send protocol adverts before registering IP addresses to the interface.
* Review the LEAVE_MASTER_STATE to only handle state transition
if wanted states are BACKUP or FAULT.
* Review the BACKUP state to force new protocol election if
receiving a lower priority advert.
* Fixed a BACKUP to MASTER state transition if interface is reported UP.
* Fake the ipvs_syncd_cmd function if running LVS using Kernel 2.2
Release 0.5.5 | VRRP
* Fixed a gratuitous ARP porting bug.
* VRRP : Review the data structure to be more generic
and clean with the rest of the code.
* VRRP : Remove the interface flags (NIC) ioctl functions
* VRRP : Created an interface (NIC) library giving access
to common interface helpers functions.
* VRRP : Created an interface lookup function creating a global
interface structure during daemon bootstrap. Consist of a netlink
RTM_GETLINK & RTM_GETADDR lookup, so we can work with a userspace
interface representation.
* VRRP : Create a netlink kernel reflection framework updating
dynamically our interface structure according to kernel
netlink broadcast. This design is highly inspired from zebra.
=> Reflection mean : wait for netlink kernel broadcast, if received,
wakeup netlink filter to update our userspace representation.
Prefer this design instead of a delayed netlink poller. That way
we reduce global overhead.
* VRRP : VRRP need to detect failure from many places.
If netlink can notify for many troubles like mainly
IFF_UP|DOWN & IFF_RUNNING, those flags are kernel drivers dependent.
To reduce takeover time and performance we need to have informations like
: Does the media link is present ?. The fact is that most of the new NICs
own embended hardware chip providing such informations. So created a
MII transceiver status register thread poller. Monitoring Basic Mode
Status Register (BMSR) of the MII status words. Waiting for kernel
NIC drivers hackers to support this functionnality through netlink
(=> Like a IFF_RUNNING update broadcast).
* VRRP : Linked the state machine to the global interface structure.
NIC failure/events are handled.
* VRRP : Review the whole state machine code to be more realistic. The
State transition diagram described into the RFC2338 is an obtimist
view. The VRRP state transition diagram implemented here is :
| | Initialize | |
| V V |
| Master | | Backup |
^ | | | ^
| | +------>| Dummy Master | | |
| | | | |
| | V | |
| | Fault | |
* VRRP : Robust multicast handling. Something really strange
is : after a NIC failure (in fallback mode) without closing
the socket, multicast advert can be sent but not received ?
really strange don t know why probably an IGMP resubmit ?.
So multicast group is left during failover (media trouble,
IFF_DOWN or !IFF_RUNNING). In fallback, we register a new
membership and synchronize all the packet dispatcher fds.
* VRRP : Fixed a checksum trouble using password authentication.
* VRRP : Added support to the LVS sync daemon. This permit
LVS sync daemon to be state drived by a specific VRRP instance.
* Review the autoconf/automake to be more generic.
* Some cosmetics patches.
Release 0.5.3 | Enhancements
* Added autoconf / automake generic scripts.
* Rewrite the configuration file stream parser.
Using a generic keywords tree. Each keyword refer a specific
stream handler. The main stream processor is a multilevel
recursive function getting file stream and backtracking the
keyword tree. Kind of global compiler structure using event driven
stream processing.
* Re-design the global data structure to be much more generic and
to dissociate LVS configuration related to checkers related. Remove
static char lenght to use dynamic length strings.
* Created a global timer framework.
* Created a global vector template, used in cofiguration file
parsing (both stream process & keywords tree generation).
* Created a global list template, used in most of the code.
* Review the global scheduler to remove repeated code.
* Created a global checkers API. The design and goal here is to
facilitate new checkers creation by localizing specific checker
code into a single file without any other global framework
* Patched a SSL stream handling race condition finding end of stream.
* Jan Holmberg, review MISC checker to use forked process to not degrade
global scheduler timer.
* Revisited the whole code to use new templates structures.
* Fixed a url lentgh bug into the genhash utility.
* Fabrice Bucher, <fabrice.bucher <at>> fixed a timeout_persistence
bug in the IPVS wrapper code.
* Bradley McLean, <bradlist <at>> added support to '0' port number
service in VS manipulation. Useful for balancing all services (host rather
than service).
* Matthijs van der Klip, <matthijs.van.der.klip <at>> enhanced smtp
framework to use SMTP header and email enclosed with angle brackets.
Release 0.4.9a | Bug fixes
* Jan and I patched a memory pointer problem in vrrp scheduler. 
Thanks to Negrea Mihai, <mike <at>> for reporting.
* Jan patched a memory reallocation pointer exception in memory
management framework.
* Jan fined a vrrp vip set/remove retry.
* Created the Keepalived UserGuide.
Release 0.4.9 | Enhancements
* Jan Holmberg, <jan <at>> added a memory managment framework.
In debug mode it is used as a memory leak buster. We can so use it
to debug quickly memory leaks (buffer overrun, allocation errors, ...).
* Jan Holmberg and I added support to SSL. Checker SSL_GET. Can be used
with autogenerated cert or with specific cafile, certfile, keyfile.
* Use the OpenSSL, <> library for MD5 & SSL functions.
* Jan Holmberg and I Rewrote the HTTP_GET code to use full asynchronous
stream handling. The code use a common part for HTTP/SSL stream handling.
Review the MD5 digest buffer computation, update MD5 over received buffer.
* Patched some memory leaks in smtp handling.
* Jan Holmbarg added support to LVS FWMARK.
* Added command line option for keepalived. Used the libpopt library.
-h, -v, -n, -d, -l, -f.
* Jan Holmberg and I added debugging facility on keepalived console.
* Added a BOOTSTRAP_DELAY of 1sec when registering checkers during
daemon bootstrap.
* VRRP : Jan Holmberg added possibility to run an extra script when
VRRP Instance become or leave MASTER STATE (=> using a forked process).
* Review/fine the whole code to apply cosmetics patch.
* Rewrote the genhash utility.
* Started checkers API specs.
* doc doc doc...
Release 0.4.8 | MAJOR RELEASE
* Rewrite the whole VRRP previous code.
* VRRP : Created a hierarchic scheduling framework.
Handle VRRP instances multiplexing on the same I/O fd.
VRRP I/O events are handled by our global scheduling
framework. Then the global sheduling framework call a VRRP
I/O instance dispatcher to manage VRRP instances.
* VRRP : Created a temporary socket pool to handle register
our VRRP thread instances.
We create & allocate a socket pool here. The soft design
can be sum up by the following sketch :

fd1 fd2 fd3 fd4 fdi fdi+1
| ETH0 | | ETH1 | | ETHn |

Here we have n physical NIC. Each NIC own a maximum of 2 fds.
(one for VRRP the other for IPSEC_AH). All our VRRP instances
are multiplexed through this fds. So our design can handle 2*n
multiplexing points.
* VRRP : Review the multicast socket creating. We bind the socket
to a specific NIC. inbound & outbound traffic are bound to the
sk->bound_dev_if themself ??? !!!
Needed for filter multicasted advert per interface.
=> For inbound binding we use SO_BINDTODEVICE kernel option.
* VRRP : Created a read dispatcher thread to deal with our sockpool.
Handle VRRP states & transition states.
* VRRP : Created a VRRP synchronization instance circuit. This
functionnality gave you the ability to monitor VRRP instance
each other. This mean that if 2 VRRP instances are monitoring
themself and if one of this instance change state, the other
follow the same state. ex.: With 2 VRRP instances (VI_1 & VI_2)
if VI_1 become backup then VI_2 become backup too. (symetricly
with master VRRP state).
* VRRP : Rewrite the netlink interface to use non blocking socket.
* VRRP : Rewrite the ipaddress handling to use the new netlink
* VRRP : Remove the VRPP VMAC handling since linux kernel only
permit to use one MAC address on a specific NIC. We use gratuitous
arp when setting up VRRP VIP, to uptade remote host arp caches.
=> In certain case this can cause a TCP session renegociation
which can cause a permature session end.
=> To be fully compliant with the VRRP RFC, need to patch the
kernel to gave it the possibility to deal with more than one
MAC address at a time. Give me clue on it please ! to same me
a little time :)
* Starting VRRP documentation.
* Patch a pidfile handling bug when forking the keepalived daemon.
Thanks goes to Gianni D'Aprile for pointing it to me.
* Patch a timer race condition into the scheduling framework.
This bug caused tcpcheck to respawn quickly...
Thanks goes to Gianni D'Aprile for pointing it to me.
Release 0.3.8 | Enhancements
* Added support to native LVS netfilter code on NAT.
=> Using NAT on 2.4 Kernel, ipchains kernel support
has been removed.
* Added support to Direct routing & Tunneling.
* Review the keepalived.init script to make it much more
* Some cosmetics patch.
Release 0.3.7 | Enhancements
* Added support to LVS kernel 2.4 code.
Release 0.3.6 | Bug fixes
* Patch a race condition into the scheduler timer computation.
* Patch a race condition into the tcp checker thread. Only
register next timer thread if tcp connection is not in progress.
* Patch a race condition into the http checker thread. Handle
empty buffer returned from remote http server.
* Patch a race condition into the dumping configuration process.
A simple dereferencing pointer value...oops...
* Eric Jarman, <ehj38230 <at>> added MISC CHECKER.
It Perform a system call to run an extra system or script.
=> security auditing needed for system call,
buffer overflow over script path must be handled.
Release 0.3.5 | MAJOR RELEASE
* Rewrite the whole signal handling, registering a terminating
thread on signal.
* Move logsystem to syslog using facility LOG_INFO & LOG_DEBUG.
* Added a daemonization function imported from zebra.
* Rewrite the pidfile handling, check if daemon is running, if not
remove eventual stalled pidfile and create new pidfile.
* Added a strong scheduling framework based on an I/O multiplexer
to handle asynchronous process. This code is imported from zebra
and have been enhanced for keepalived purposes.

Thread types are :
. timeouted read on fd.
. timeouted write on fd.
. timer.
. event.
. terminate event.

=> The zebra framework have been enhanced to add support for timeouted
read/write fds.
=> With this framework keepalived use a Boss/Worker thread model design,
fetching ready thread from a master threading queues.
* Rewrite the configuration file reader to add flexibility on extending.
The dynamic data structure has been rewritten to use apropriate types.
Right now parsing framework is ready for easy new checker structures
* Rewrite the smtp connector. The implementation take advantage of the
I/O multiplexer. All read/write operations from/to the remote smtp server
are done asynchronously. The implementation is rfc 821 compliant (multiple
receiver are handled by a multiple RCPT TO command as specified in rfc821.3.1).
* Rewrite the IPFW & IPVS wrappers.
* Added support for NAT mask on IP MASQ rules (keyword nat_mask in configuration
file). Added support for sorry server facility, so when all the server from a
VS server pool are removed, a sorry server is automaticaly added to the VS pool
(typically this is used when you have a spare server online).
* Rewrite the previous checkers. Checkers are now based on a hierarchic layer
stack framework. The protocol implemented for the moment is TCP. All layer 5
checkers are using layer4.c primitives with the same design :
. a checker connector thread (creating the socket) registering the connection
checker thread.
. a connection checker thread testing connection states (error, in_progress,
timeout, success). When connection success upper level thread are registered
to handle checks.
* Delay loop is now checkers specifics since we can use a multithreaded framework.
* Update the PDF documentation file.
Release 0.2.7 | Minor Bug fixes
Patch a missed close socket descriptor (oops). Causing a premature daemon hangup.
* ipfwwrapper :
Added an ip firewall kernel wrapper using the 'Rusty' firewall manipulation library.
* ipvswrapper :
Added support to the IP_MASQ_CMD ruleset.
IP_MASQ_CMD_ADD : Adding a virtual service.
IP_MASQ_CMD_DEL : Deleting a virtual service.
IP_MASQ_CMD_ADD_DEST : Adding a real service to a virtual service.
IP_MASQ_CMD_DEL_DEST : Deleting a real service to a virtual service.
* lvs.conf file is now obsolete. All configurations are done in keepalived.conf file.
* Cosmetics patches.
* Starting creating the core documentation.
Release 0.2.6 | Major Bug fixes
* keepalived main program :
Change signal handling.
Adding pidfile lock.
Change the dynamic data structure representation.
Use global var to log daemon pid.
Adding support for multi-url get check.
Creating RPM distribution file.
* cfreader :
Change the dynamic data structure representation. Move to a tree data structure.
Revisited the pointer functions manipulation for the dynamic data structure.
Adding keywords support for the configuration file.
Adding email support for notification alerts.
md5 : Move to the L. Peter Deutsch independent md5 RFC1321 implementation.
* smtpwrapper :
Added smtpwrapper for sending notification via email.
Using smtp protocol according to the RFC822.
Smtp server connection using a NON_BLOCK timeouted tcp connection.
Processing smtp server answer according to the smtp protocol.
Remove the whole RAW_SOCKET tcpcheck level initial implementation.
Adding vanilla tcpcheck using a non blocking/so_linger socket descriptor.
Use a timeval to set the socket descriptor timeout.
* ICMPCHECK : move in a futur work.
Use a non blocking timeouted tcp connection.
Adding support for multi-url. Can perform HTTP GET over multiple url on the
same tcp service (useful for HTTP server owning multiple applications servers).
Adding HTTP GET retry support.
Replace the initial libmd call by L. Peter Deutsch implementation.
Parse the whole HTTP GET reply, computing a md5sum over the html response buffer.
Adding delay support before HTTP GET retry.
Release 0.2.3 | Workaround
Added recvfrom_to() function to handle recvfrom timeouted connection using a select call.
Call this function in TCP_RCV_SYNACK_PACKET with 1s timeout.
Added a timer (2s timeouted) in TCP_RCV_SYNACK_PACKET to check SYN|ACK packet.
Check perform on tcp sequence, remote tcp port number, tcp SYN|ACK flag & remote ip address.
Added a 3 time SYN packet send retry.
Added recvfrom_to() function to handle recvfrom timeouted connection.
Call this function in ICMP_RCV_ECHOREPLY with 1s timeout.
Added a timer (2s timeouted) in ICMP_RCV_ECHOREPLY to check ECHO_REPLY.
Check perform on icmp type flag, remote ip address.
Added a 3 time ECHO_REQUEST send retry.
* Cosmetic debugging messages.
Release 0.2.1 | INITIAL RELEASE