Merge pull request #3138 from donaldsharp/fairy_dust

Additional information in zebra and bgp

bgpd/bgp_evpn.c

@@ -558,9 +558,12 @@ static int bgp_zebra_send_remote_macip(struct bgp *bgp, struct bgpevpn *vpn,
 		return 0;
 
 	/* Don't try to register if Zebra doesn't know of this instance. */
-	if (!IS_BGP_INST_KNOWN_TO_ZEBRA(bgp))
+	if (!IS_BGP_INST_KNOWN_TO_ZEBRA(bgp)) {
+		if (BGP_DEBUG(zebra, ZEBRA))
+			zlog_debug("%s: No zebra instance to talk to, not installing remote macip",
+				   __PRETTY_FUNCTION__);
 		return 0;
-
+	}
 	s = zclient->obuf;
 	stream_reset(s);
 
@@ -616,8 +619,12 @@ static int bgp_zebra_send_remote_vtep(struct bgp *bgp, struct bgpevpn *vpn,
 		return 0;
 
 	/* Don't try to register if Zebra doesn't know of this instance. */
-	if (!IS_BGP_INST_KNOWN_TO_ZEBRA(bgp))
+	if (!IS_BGP_INST_KNOWN_TO_ZEBRA(bgp)) {
+		if (BGP_DEBUG(zebra, ZEBRA))
+			zlog_debug("%s: No zebra instance to talk to, not installing remote vtep",
+				   __PRETTY_FUNCTION__);
 		return 0;
+	}
 
 	s = zclient->obuf;
 	stream_reset(s);

bgpd/bgp_nexthop.c

@@ -628,6 +628,9 @@ static void bgp_show_nexthops(struct vty *vty, struct bgp *bgp, int detail)
 				if (CHECK_FLAG(bnc->flags,
 					       BGP_NEXTHOP_CONNECTED))
 					vty_out(vty, "  Must be Connected\n");
+				if (!CHECK_FLAG(bnc->flags,
+						BGP_NEXTHOP_REGISTERED))
+					vty_out(vty, "  Is not Registered\n");
 			}
 			tbuf = time(NULL) - (bgp_clock() - bnc->last_update);
 			vty_out(vty, "  Last update: %s", ctime(&tbuf));

bgpd/bgp_nht.c

@@ -240,8 +240,8 @@ int bgp_find_or_add_nexthop(struct bgp *bgp_route, struct bgp *bgp_nexthop,
 		UNSET_FLAG(bnc->flags, BGP_NEXTHOP_VALID);
 	}
 	if (bgp_route->inst_type == BGP_INSTANCE_TYPE_VIEW) {
-		bnc->flags |= BGP_NEXTHOP_REGISTERED;
+		SET_FLAG(bnc->flags, BGP_NEXTHOP_REGISTERED);
-		bnc->flags |= BGP_NEXTHOP_VALID;
+		SET_FLAG(bnc->flags, BGP_NEXTHOP_VALID);
 	} else if (!CHECK_FLAG(bnc->flags, BGP_NEXTHOP_REGISTERED))
 		register_zebra_rnh(bnc, is_bgp_static_route);
 	if (pi && pi->nexthop != bnc) {
@@ -587,9 +587,18 @@ static void sendmsg_zebra_rnh(struct bgp_nexthop_cache *bnc, int command)
 		return;
 
 	/* Don't try to register if Zebra doesn't know of this instance. */
-	if (!IS_BGP_INST_KNOWN_TO_ZEBRA(bnc->bgp))
+	if (!IS_BGP_INST_KNOWN_TO_ZEBRA(bnc->bgp)) {
+		if (BGP_DEBUG(zebra, ZEBRA))
+			zlog_debug("%s: No zebra instance to talk to, not installing NHT entry",
+				   __PRETTY_FUNCTION__);
 		return;
+	}
 
+	if (!bgp_zebra_num_connects()) {
+		if (BGP_DEBUG(zebra, ZEBRA))
+			zlog_debug("%s: We have not connected yet, cannot send nexthops",
+				   __PRETTY_FUNCTION__);
+	}
 	p = &(bnc->node->p);
 	if ((command == ZEBRA_NEXTHOP_REGISTER
 	     || command == ZEBRA_IMPORT_ROUTE_REGISTER)
@@ -802,3 +811,30 @@ void path_nh_map(struct bgp_path_info *path, struct bgp_nexthop_cache *bnc,
 		path->nexthop->path_count++;
 	}
 }
+
+/*
+ * This function is called to register nexthops to zebra
+ * as that we may have tried to install the nexthops
+ * before we actually have a zebra connection
+ */
+void bgp_nht_register_nexthops(struct bgp *bgp)
+{
+	struct bgp_node *rn;
+	struct bgp_nexthop_cache *bnc;
+	afi_t afi;
+
+	for (afi = AFI_IP; afi < AFI_MAX; afi++) {
+		if (!bgp->nexthop_cache_table[afi])
+			continue;
+
+		for (rn = bgp_table_top(bgp->nexthop_cache_table[afi]); rn;
+		     rn = bgp_route_next(rn)) {
+			bnc = bgp_nexthop_get_node_info(rn);
+
+			if (!bnc)
+				continue;
+
+			register_zebra_rnh(bnc, 0);
+		}
+	}
+}

bgpd/bgp_nht.h

@@ -81,5 +81,11 @@ extern void bgp_cleanup_nexthops(struct bgp *bgp);
  */
 extern void path_nh_map(struct bgp_path_info *path,
 			struct bgp_nexthop_cache *bnc, bool make);
+/*
+ * When we actually have the connection to
+ * the zebra daemon, we need to reregister
+ * any nexthops we may have sitting around
+ */
+extern void bgp_nht_register_nexthops(struct bgp *bgp);
 
 #endif /* _BGP_NHT_H */

bgpd/bgp_zebra.c

@@ -68,8 +68,11 @@ static inline int bgp_install_info_to_zebra(struct bgp *bgp)
 	if (zclient->sock <= 0)
 		return 0;
 
-	if (!IS_BGP_INST_KNOWN_TO_ZEBRA(bgp))
+	if (!IS_BGP_INST_KNOWN_TO_ZEBRA(bgp)) {
+		zlog_debug("%s: No zebra instance to talk to, not installing information",
+			   __PRETTY_FUNCTION__);
 		return 0;
+	}
 
 	return 1;
 }
@@ -1834,6 +1837,8 @@ void bgp_zebra_instance_register(struct bgp *bgp)
 	 */
 	if (bgp->inst_type == BGP_INSTANCE_TYPE_DEFAULT && is_evpn_enabled())
 		bgp_zebra_advertise_all_vni(bgp, 1);
+
+	bgp_nht_register_nexthops(bgp);
 }
 
 /* Deregister this instance with Zebra. Invoked upon the instance
@@ -1895,8 +1900,12 @@ int bgp_zebra_advertise_subnet(struct bgp *bgp, int advertise, vni_t vni)
 		return 0;
 
 	/* Don't try to register if Zebra doesn't know of this instance. */
-	if (!IS_BGP_INST_KNOWN_TO_ZEBRA(bgp))
+	if (!IS_BGP_INST_KNOWN_TO_ZEBRA(bgp)) {
+		if (BGP_DEBUG(zebra, ZEBRA))
+			zlog_debug("%s: No zebra instance to talk to, cannot advertise subnet",
+				   __PRETTY_FUNCTION__);
 		return 0;
+	}
 
 	s = zclient->obuf;
 	stream_reset(s);
@@ -1918,8 +1927,12 @@ int bgp_zebra_advertise_gw_macip(struct bgp *bgp, int advertise, vni_t vni)
 		return 0;
 
 	/* Don't try to register if Zebra doesn't know of this instance. */
-	if (!IS_BGP_INST_KNOWN_TO_ZEBRA(bgp))
+	if (!IS_BGP_INST_KNOWN_TO_ZEBRA(bgp)) {
+		if (BGP_DEBUG(zebra, ZEBRA))
+			zlog_debug("%s: No zebra instance to talk to, not installing gw_macip",
+				   __PRETTY_FUNCTION__);
 		return 0;
+	}
 
 	s = zclient->obuf;
 	stream_reset(s);
@@ -1942,8 +1955,12 @@ int bgp_zebra_vxlan_flood_control(struct bgp *bgp,
 		return 0;
 
 	/* Don't try to register if Zebra doesn't know of this instance. */
-	if (!IS_BGP_INST_KNOWN_TO_ZEBRA(bgp))
+	if (!IS_BGP_INST_KNOWN_TO_ZEBRA(bgp)) {
+		if (BGP_DEBUG(zebra, ZEBRA))
+			zlog_debug("%s: No zebra instance to talk to, not installing all vni",
+				   __PRETTY_FUNCTION__);
 		return 0;
+	}
 
 	s = zclient->obuf;
 	stream_reset(s);

bgpd/bgpd.c

@@ -3072,9 +3072,12 @@ int bgp_get(struct bgp **bgp_val, as_t *as, const char *name,
 	bgp_handle_socket(bgp, vrf, VRF_UNKNOWN, true);
 	listnode_add(bm->bgp, bgp);
 
-	if (IS_BGP_INST_KNOWN_TO_ZEBRA(bgp))
+	if (IS_BGP_INST_KNOWN_TO_ZEBRA(bgp)) {
+		if (BGP_DEBUG(zebra, ZEBRA))
+			zlog_debug("%s: Registering BGP instance %s to zebra",
+				   __PRETTY_FUNCTION__, name);
 		bgp_zebra_instance_register(bgp);
-
+	}
 
 	return 0;
 }
@@ -3218,8 +3221,12 @@ int bgp_delete(struct bgp *bgp)
 	}
 
 	/* Deregister from Zebra, if needed */
-	if (IS_BGP_INST_KNOWN_TO_ZEBRA(bgp))
+	if (IS_BGP_INST_KNOWN_TO_ZEBRA(bgp)) {
+		if (BGP_DEBUG(zebra, ZEBRA))
+			zlog_debug("%s: deregistering this bgp %s instance from zebra",
+				   __PRETTY_FUNCTION__, bgp->name);
 		bgp_zebra_instance_deregister(bgp);
+	}
 
 	/* Remove visibility via the master list - there may however still be
 	 * routes to be processed still referencing the struct bgp.

zebra/zapi_msg.c

@@ -1056,6 +1056,7 @@ static void zread_rnh_register(ZAPI_HANDLER_ARGS)
 		STREAM_GETC(s, p.prefixlen);
 		l += 4;
 		if (p.family == AF_INET) {
+			client->v4_nh_watch_add_cnt++;
 			if (p.prefixlen > IPV4_MAX_BITLEN) {
 				zlog_debug(
 					"%s: Specified prefix hdr->length %d is too large for a v4 address",
@@ -1065,6 +1066,7 @@ static void zread_rnh_register(ZAPI_HANDLER_ARGS)
 			STREAM_GET(&p.u.prefix4.s_addr, s, IPV4_MAX_BYTELEN);
 			l += IPV4_MAX_BYTELEN;
 		} else if (p.family == AF_INET6) {
+			client->v6_nh_watch_add_cnt++;
 			if (p.prefixlen > IPV6_MAX_BITLEN) {
 				zlog_debug(
 					"%s: Specified prefix hdr->length %d is to large for a v6 address",
@@ -1139,6 +1141,7 @@ static void zread_rnh_unregister(ZAPI_HANDLER_ARGS)
 		STREAM_GETC(s, p.prefixlen);
 		l += 4;
 		if (p.family == AF_INET) {
+			client->v4_nh_watch_rem_cnt++;
 			if (p.prefixlen > IPV4_MAX_BITLEN) {
 				zlog_debug(
 					"%s: Specified prefix hdr->length %d is to large for a v4 address",
@@ -1148,6 +1151,7 @@ static void zread_rnh_unregister(ZAPI_HANDLER_ARGS)
 			STREAM_GET(&p.u.prefix4.s_addr, s, IPV4_MAX_BYTELEN);
 			l += IPV4_MAX_BYTELEN;
 		} else if (p.family == AF_INET6) {
+			client->v6_nh_watch_rem_cnt++;
 			if (p.prefixlen > IPV6_MAX_BITLEN) {
 				zlog_debug(
 					"%s: Specified prefix hdr->length %d is to large for a v6 address",

zebra/zserv.c

@@ -940,6 +940,10 @@ static void zebra_show_client_detail(struct vty *vty, struct zserv *client)
 		client->ifdel_cnt);
 	vty_out(vty, "BFD peer    %-12d%-12d%-12d\n", client->bfd_peer_add_cnt,
 		client->bfd_peer_upd8_cnt, client->bfd_peer_del_cnt);
+	vty_out(vty, "NHT v4      %-12d%-12d%-12d\n",
+		client->v4_nh_watch_add_cnt, 0, client->v4_nh_watch_rem_cnt);
+	vty_out(vty, "NHT v6      %-12d%-12d%-12d\n",
+		client->v6_nh_watch_add_cnt, 0, client->v6_nh_watch_rem_cnt);
 	vty_out(vty, "Interface Up Notifications: %d\n", client->ifup_cnt);
 	vty_out(vty, "Interface Down Notifications: %d\n", client->ifdown_cnt);
 	vty_out(vty, "VNI add notifications: %d\n", client->vniadd_cnt);

zebra/zserv.h

@@ -133,6 +133,10 @@ struct zserv {
 	uint32_t macipdel_cnt;
 	uint32_t prefixadd_cnt;
 	uint32_t prefixdel_cnt;
+	uint32_t v4_nh_watch_add_cnt;
+	uint32_t v4_nh_watch_rem_cnt;
+	uint32_t v6_nh_watch_add_cnt;
+	uint32_t v6_nh_watch_rem_cnt;
 
 	time_t nh_reg_time;
 	time_t nh_dereg_time;