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bgpd: add AFI/SAFI check for RFC 9234

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RFC 9234 mandates that role rules apply only to IPv4/IPv6 unicast bgp
sessions. If the OTC attribute appears in other sessions, it will remain
untouched.

Signed-off-by: Eugene Bogomazov <eb@qrator.net>
This commit is contained in:
Eugene Bogomazov 2022-06-22 12:47:22 +03:00
parent aee05e20fd
commit 5a78f2bcb0
1 changed files with 9 additions and 3 deletions
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12
bgpd/bgp_route.c
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@ -1598,6 +1598,11 @@ static bool bgp_otc_egress(struct peer *peer, struct attr *attr)
return false;
}
static bool bgp_check_role_applicability(afi_t afi, safi_t safi)
{
return ((afi == AFI_IP || afi == AFI_IP6) && safi == SAFI_UNICAST);
}
static int bgp_input_modifier(struct peer *peer, const struct prefix *p,
struct attr *attr, afi_t afi, safi_t safi,
const char *rmap_name, mpls_label_t *label,
@ -2202,7 +2207,8 @@ bool subgroup_announce_check(struct bgp_dest *dest, struct bgp_path_info *pi,
memset(&attr->mp_nexthop_local, 0, IPV6_MAX_BYTELEN);
}
if (bgp_otc_egress(peer, attr))
if (bgp_check_role_applicability(afi, safi) &&
bgp_otc_egress(peer, attr))
return false;
bgp_peer_remove_private_as(bgp, afi, safi, peer, attr);
@ -4001,12 +4007,12 @@ int bgp_update(struct peer *peer, const struct prefix *p, uint32_t addpath_id,
goto filtered;
}
if (bgp_otc_filter(peer, &new_attr)) {
if (bgp_check_role_applicability(afi, safi) &&
bgp_otc_filter(peer, &new_attr)) {
reason = "failing otc validation";
bgp_attr_flush(&new_attr);
goto filtered;
}
/* The flag BGP_NODE_FIB_INSTALL_PENDING is for the following
* condition :
* Suppress fib is enabled