bgpd: don't adv conditionally withdrawn routes

If we have conditional advertisement enabled, and conditionally withdrew
some prefixes, and then we do a 'clear bgp', those routes were getting
advertised again, and then withdrawn the next time the conditional
advertisement scanner executed.

When we go to advertise check the prefix against the conditional
advertisement status so we don't do that.

Signed-off-by: Quentin Young <qlyoung@nvidia.com>

bgpd/bgp_route.c

@@ -2212,6 +2212,32 @@ bool subgroup_announce_check(struct bgp_dest *dest, struct bgp_path_info *pi,
 	bgp_peer_remove_private_as(bgp, afi, safi, peer, attr);
 	bgp_peer_as_override(bgp, afi, safi, peer, attr);
 
+	if (filter->advmap.update_type == UPDATE_TYPE_WITHDRAW &&
+	    filter->advmap.aname &&
+	    route_map_lookup_by_name(filter->advmap.aname)) {
+		struct bgp_path_info rmap_path = {0};
+		struct bgp_path_info_extra dummy_rmap_path_extra = {0};
+		struct attr dummy_attr = *attr;
+
+		/* Fill temp path_info */
+		prep_for_rmap_apply(&rmap_path, &dummy_rmap_path_extra, dest,
+				    pi, peer, &dummy_attr);
+
+		struct route_map *amap =
+			route_map_lookup_by_name(filter->advmap.aname);
+
+		ret = route_map_apply(amap, p, &rmap_path);
+
+		bgp_attr_flush(&dummy_attr);
+
+		/*
+		 * The conditional advertisement mode is Withdraw and this
+		 * prefix is a conditional prefix. Don't advertise it
+		 */
+		if (ret == RMAP_PERMITMATCH)
+			return false;
+	}
+
 	/* Route map & unsuppress-map apply. */
 	if (!post_attr &&
 	    (ROUTE_MAP_OUT_NAME(filter) || bgp_path_suppressed(pi))) {