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Merge pull request #5432 from chiragshah6/evpn_dev2

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bgpd: Handle possible non-selection of local route
This commit is contained in:
Sri Mohana Singamsetty 2019-12-02 17:17:26 -08:00 committed by GitHub
commit da579bf9ff
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1 changed files with 39 additions and 17 deletions
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56
bgpd/bgp_evpn.c
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@ -1918,9 +1918,15 @@ static int update_evpn_route(struct bgp *bgp, struct bgpevpn *vpn,
/* lock ri to prevent freeing in evpn_route_select_install */
bgp_path_info_lock(pi);
/* Perform route selection; this is just to set the flags correctly
* as local route in the VNI always wins.
*/
/* Perform route selection. Normally, the local route in the
* VNI is expected to win and be the best route. However, if
* there is a race condition where a host moved from local to
* remote and the remote route was received in BGP just prior
* to the local MACIP notification from zebra, the remote
* route would win, and we should evict the defunct local route
* and (re)install the remote route into zebra.
*/
evpn_route_select_install(bgp, vpn, rn);
/*
* If the new local route was not selected evict it and tell zebra
@ -2207,24 +2213,40 @@ static int update_all_type2_routes(struct bgp *bgp, struct bgpevpn *vpn)
update_evpn_route_entry(bgp, vpn, afi, safi, rn, &attr, 0, &pi,
0, seq);
/* Perform route selection; this is just to set the flags
* correctly as local route in the VNI always wins.
/* lock ri to prevent freeing in evpn_route_select_install */
bgp_path_info_lock(pi);
/* Perform route selection. Normally, the local route in the
* VNI is expected to win and be the best route. However,
* under peculiar situations (e.g., tunnel (next hop) IP change
* that causes best selection to be based on next hop), a
* remote route could win. If the local route is the best,
* ensure it is updated in the global EVPN route table and
* advertised to peers; otherwise, ensure it is evicted and
* (re)install the remote route into zebra.
*/
evpn_route_select_install(bgp, vpn, rn);
if (!CHECK_FLAG(pi->flags, BGP_PATH_SELECTED)) {
evpn_cleanup_local_non_best_route(bgp, vpn, rn, pi);
/* unlock pi */
bgp_path_info_unlock(pi);
} else {
attr_new = pi->attr;
/* unlock pi */
bgp_path_info_unlock(pi);
attr_new = pi->attr;
/* Update route in global routing table. */
rd_rn = bgp_afi_node_get(bgp->rib[afi][safi], afi, safi,
(struct prefix *)evp, &vpn->prd);
assert(rd_rn);
update_evpn_route_entry(bgp, vpn, afi, safi, rd_rn,
attr_new, 0, &global_pi, 0,
mac_mobility_seqnum(attr_new));
/* Update route in global routing table. */
rd_rn = bgp_afi_node_get(bgp->rib[afi][safi], afi, safi,
(struct prefix *)evp, &vpn->prd);
assert(rd_rn);
update_evpn_route_entry(bgp, vpn, afi, safi, rd_rn, attr_new, 0,
&global_pi, 0,
mac_mobility_seqnum(attr_new));
/* Schedule for processing and unlock node. */
bgp_process(bgp, rd_rn, afi, safi);
bgp_unlock_node(rd_rn);
/* Schedule for processing and unlock node. */
bgp_process(bgp, rd_rn, afi, safi);
bgp_unlock_node(rd_rn);
}
/* Unintern temporary. */
aspath_unintern(&attr.aspath);