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bgpd: check nexthop vrf usability

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Mark a nexthop as invalid if the origin VRF is unusable, either because
it does not exist or its interface is down.

Signed-off-by: Louis Scalbert <louis.scalbert@6wind.com>
This commit is contained in:
Louis Scalbert 2024-11-06 13:52:03 +01:00
parent 3430526e11
commit 779077bf56
1 changed files with 10 additions and 0 deletions
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10
bgpd/bgp_mplsvpn.c
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@ -1052,6 +1052,7 @@ static bool leak_update_nexthop_valid(struct bgp *to_bgp, struct bgp_dest *bn,
struct bgp_path_info *bpi_ultimate; struct bgp_path_info *bpi_ultimate;
struct bgp *bgp_nexthop; struct bgp *bgp_nexthop;
struct bgp_table *table; struct bgp_table *table;
struct interface *ifp;
bool nh_valid; bool nh_valid;
bpi_ultimate = bgp_get_imported_bpi_ultimate(source_bpi); bpi_ultimate = bgp_get_imported_bpi_ultimate(source_bpi);
@ -1062,6 +1063,15 @@ static bool leak_update_nexthop_valid(struct bgp *to_bgp, struct bgp_dest *bn,
else else
bgp_nexthop = bgp_orig; bgp_nexthop = bgp_orig;
/* The nexthop is invalid if its VRF does not exist */
if (bgp_nexthop->vrf_id == VRF_UNKNOWN)
return false;
/* The nexthop is invalid if its VRF interface is down*/
ifp = if_get_vrf_loopback(bgp_nexthop->vrf_id);
if (ifp && !if_is_up(ifp))
return false;
/* /*
* No nexthop tracking for redistributed routes, for * No nexthop tracking for redistributed routes, for
* EVPN-imported routes that get leaked, or for routes * EVPN-imported routes that get leaked, or for routes