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bgpd: Do not allow a peer to come up on v6 if we have no ability to route

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Modify bgp to not allow a v6 peer to come up if the v6 afi is negotiated
and the outgoing interface has no v6 address as well as zebra does
not support the v6 with v4 nexthop capabilities that some dataplanes
allow.

Signed-off-by: Donald Sharp <sharpd@nvidia.com>
This commit is contained in:
Donald Sharp 2023-08-02 21:15:02 -04:00
parent 052debc3ee
commit 95002ded3e
1 changed files with 8 additions and 5 deletions
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13
bgpd/bgp_packet.c
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@ -1735,11 +1735,14 @@ static int bgp_open_receive(struct peer *peer, bgp_size_t size)
|| peer->afc_nego[AFI_IP6][SAFI_MULTICAST]
|| peer->afc_nego[AFI_IP6][SAFI_MPLS_VPN]
|| peer->afc_nego[AFI_IP6][SAFI_ENCAP]) {
if (IN6_IS_ADDR_UNSPECIFIED(&peer->nexthop.v6_global)) {
#if defined(HAVE_CUMULUS)
zlog_warn("%s: No local IPv6 address, BGP routing may not work",
peer->host);
#endif
if (IN6_IS_ADDR_UNSPECIFIED(&peer->nexthop.v6_global) &&
!bm->v6_with_v4_nexthops) {
flog_err(EC_BGP_SND_FAIL,
"%s: No local IPv6 address, and zebra does not support V6 routing with v4 nexthops, BGP routing for V6 will not work",
peer->host);
bgp_notify_send(peer, BGP_NOTIFY_CEASE,
BGP_NOTIFY_SUBCODE_UNSPECIFIC);
return BGP_Stop;
}
}
peer->rtt = sockopt_tcp_rtt(peer->fd);