virDomainMigratePrepareTunnel3(virConnectPtr conn,
                               virStreamPtr st,
                               const char *cookiein,
                               int cookieinlen,
                               char **cookieout,
                               int *cookieoutlen,
                               unsigned long flags,
                               const char *dname,
                               unsigned long bandwidth,
                               const char *dom_xml)
{
    VIR_DEBUG("conn=%p, stream=%p, cookiein=%p, cookieinlen=%d, cookieout=%p, "
              "cookieoutlen=%p, flags=%lx, dname=%s, bandwidth=%lu, "
              "dom_xml=%s",
              conn, st, cookiein, cookieinlen, cookieout, cookieoutlen, flags,
              NULLSTR(dname), bandwidth, NULLSTR(dom_xml));

    virResetLastError();

    virCheckConnectReturn(conn, -1);
    virCheckReadOnlyGoto(conn->flags, error);

    if (conn != st->conn) {
        virReportInvalidArg(conn, "%s",
                            _("conn must match stream connection"));
        goto error;
    }

    if (conn->driver->domainMigratePrepareTunnel3) {
        int rv = conn->driver->domainMigratePrepareTunnel3(conn, st,
                                                           cookiein, cookieinlen,
                                                           cookieout, cookieoutlen,
                                                           flags, dname,
                                                           bandwidth, dom_xml);
        if (rv < 0)
            goto error;
        return rv;
    }

    virReportUnsupportedError();

 error:
    virDispatchError(conn);
    return -1;
}

This label identifies security gaps where expected security features are missing or only partially implemented, reducing protection against unauthorized access or manipulation.