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bgpd: Make sure Link-Local Next Hop capability has its own update-group

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We should involve checking received (not only advertised) capability, because
otherwise we put both peers (one with LL capability, another without) into a
single update-group and send 16-bytes NH instead of 16-bytes and 32-bytes
separately.

Fixes: db853cc97e ("bgpd: Implement Link-Local Next Hop capability")

Signed-off-by: Donatas Abraitis <donatas@opensourcerouting.org>
This commit is contained in:
Donatas Abraitis 2025-02-10 23:39:55 +02:00
parent e4b14dae7c
commit c91c5e8463
1 changed files with 11 additions and 0 deletions
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11
bgpd/bgp_updgrp.c
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@ -444,6 +444,14 @@ static unsigned int updgrp_hash_key_make(const void *p)
*/
key = jhash_1word(peer->local_role, key);
/* If the peer has disabled Link-Local Next Hop capability, but we
* send it, it's not taken into consideration and we always merge both
* peers into a single update-group. Make sure peer has its own update-group
* if it has disabled (received) Link-Local Next Hop capability.
*/
key = jhash_2words(!!CHECK_FLAG(peer->cap, PEER_CAP_LINK_LOCAL_RCV),
!!CHECK_FLAG(peer->cap, PEER_CAP_LINK_LOCAL_ADV), key);
/* Neighbors configured with the AIGP attribute are put in a separate
* update group from other neighbors.
*/
@ -480,6 +488,9 @@ static unsigned int updgrp_hash_key_make(const void *p)
zlog_debug("%pBP Update Group Hash: addpath paths-limit: (send %u, receive %u)",
peer, peer->addpath_paths_limit[afi][safi].send,
peer->addpath_paths_limit[afi][safi].receive);
zlog_debug("%pBP Update Group Hash: Link-Local Next Hop capability:%s%s", peer,
CHECK_FLAG(peer->cap, PEER_CAP_LINK_LOCAL_RCV) ? " received" : "",
CHECK_FLAG(peer->cap, PEER_CAP_LINK_LOCAL_ADV) ? " advertised" : "");
zlog_debug(
"%pBP Update Group Hash: max packet size: %u pmax_out: %u Peer Group: %s rmap out: %s",
peer, peer->max_packet_size, peer->pmax_out[afi][safi],