Return link-local solicited-node multicast address for given
    address. Passed address must be provided in network format.
    Returned value is also in network format.

def in6_getnsma(a):
    """
    Return link-local solicited-node multicast address for given
    address. Passed address must be provided in network format.
    Returned value is also in network format.
    """

    r = in6_and(a, inet_pton(socket.AF_INET6, '::ff:ffff'))
    r = in6_or(inet_pton(socket.AF_INET6, 'ff02::1:ff00:0'), r)
    return r