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bgpd: encode properly vpnv6 nexthop

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This change updates the nexthop attribute length
accordingly to the safi used. Actually, with the
previous commit, the length calculated was not
aligned with the real nexthop length. Such packet
received by remote peer was malformed, and this
was resulting in breaking vpnv6 peering.

Fix this by updating appropriately the real
nexthop length.

Fixes: 35ac9b53f2 ("bgpd: fix vpnv6 nexthop encoding")

Signed-off-by: Philippe Guibert <philippe.guibert@6wind.com>
This commit is contained in:
Philippe Guibert 2023-01-23 16:27:45 +01:00
parent de2e2d5ef0
commit f7a0eb6a17
1 changed files with 6 additions and 2 deletions
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8
bgpd/bgp_route.c
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@ -2273,8 +2273,12 @@ bool subgroup_announce_check(struct bgp_dest *dest, struct bgp_path_info *pi,
&& peer->shared_network
&& (from == bgp->peer_self
|| peer->sort == BGP_PEER_EBGP))) {
attr->mp_nexthop_len =
BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL;
if (safi == SAFI_MPLS_VPN)
attr->mp_nexthop_len =
BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL;
else
attr->mp_nexthop_len =
BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL;
}
/* Clear off link-local nexthop in source, whenever it is not