Merge branch 'pr/2986'

Conflicts:
	bgpd/bgp_network.c (BGP_ERR_* -> EC_BGP_*)

Signed-off-by: David Lamparter <equinox@diac24.net>

bgpd/bgp_attr.c

@@ -1705,8 +1705,14 @@ int bgp_mp_reach_parse(struct bgp_attr_parser_args *args,
 			stream_getl(s); /* RD low */
 		}
 		stream_get(&attr->mp_nexthop_global, s, IPV6_MAX_BYTELEN);
-		if (IN6_IS_ADDR_LINKLOCAL(&attr->mp_nexthop_global))
+		if (IN6_IS_ADDR_LINKLOCAL(&attr->mp_nexthop_global)) {
+			if (!peer->nexthop.ifp) {
+				zlog_warn("%s: interface not set appropriately to handle some attributes",
+					  peer->host);
+				return BGP_ATTR_PARSE_WITHDRAW;
+			}
 			attr->nh_ifindex = peer->nexthop.ifp->ifindex;
+		}
 		break;
 	case BGP_ATTR_NHLEN_IPV6_GLOBAL_AND_LL:
 	case BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL:
@@ -1716,8 +1722,14 @@ int bgp_mp_reach_parse(struct bgp_attr_parser_args *args,
 			stream_getl(s); /* RD low */
 		}
 		stream_get(&attr->mp_nexthop_global, s, IPV6_MAX_BYTELEN);
-		if (IN6_IS_ADDR_LINKLOCAL(&attr->mp_nexthop_global))
+		if (IN6_IS_ADDR_LINKLOCAL(&attr->mp_nexthop_global)) {
+			if (!peer->nexthop.ifp) {
+				zlog_warn("%s: interface not set appropriately to handle some attributes",
+					  peer->host);
+				return BGP_ATTR_PARSE_WITHDRAW;
+			}
 			attr->nh_ifindex = peer->nexthop.ifp->ifindex;
+		}
 		if (attr->mp_nexthop_len
 		    == BGP_ATTR_NHLEN_VPNV6_GLOBAL_AND_LL) {
 			stream_getl(s); /* RD high */
@@ -1741,6 +1753,11 @@ int bgp_mp_reach_parse(struct bgp_attr_parser_args *args,
 
 			attr->mp_nexthop_len = IPV6_MAX_BYTELEN;
 		}
+		if (!peer->nexthop.ifp) {
+			zlog_warn("%s: Interface not set appropriately to handle this some attributes",
+				  peer->host);
+			return BGP_ATTR_PARSE_WITHDRAW;
+		}
 		attr->nh_lla_ifindex = peer->nexthop.ifp->ifindex;
 		break;
 	default:

bgpd/bgp_network.c

@@ -36,6 +36,7 @@
 #include "filter.h"
 #include "ns.h"
 #include "lib_errors.h"
+#include "nexthop.h"
 
 #include "bgpd/bgpd.h"
 #include "bgpd/bgp_open.h"
@@ -44,6 +45,7 @@
 #include "bgpd/bgp_debug.h"
 #include "bgpd/bgp_errors.h"
 #include "bgpd/bgp_network.h"
+#include "bgpd/bgp_zebra.h"
 
 extern struct zebra_privs_t bgpd_privs;
 
@@ -618,15 +620,12 @@ int bgp_getsockname(struct peer *peer)
 	if (!peer->su_remote)
 		return -1;
 
-	if (bgp_nexthop_set(peer->su_local, peer->su_remote, &peer->nexthop,
+	if (!bgp_zebra_nexthop_set(peer->su_local, peer->su_remote,
-			    peer)) {
+				   &peer->nexthop, peer)) {
-#if defined(HAVE_CUMULUS)
+		flog_err(EC_BGP_NH_UPD,
-		flog_err(
-			EC_BGP_NH_UPD,
 			 "%s: nexthop_set failed, resetting connection - intf %p",
 			 peer->host, peer->nexthop.ifp);
 		return -1;
-#endif
 	}
 	return 0;
 }

bgpd/bgp_zebra.c

@@ -777,7 +777,8 @@ static int if_get_ipv4_address(struct interface *ifp, struct in_addr *addr)
 	return 0;
 }
 
-int bgp_nexthop_set(union sockunion *local, union sockunion *remote,
+
+bool bgp_zebra_nexthop_set(union sockunion *local, union sockunion *remote,
 			   struct bgp_nexthop *nexthop, struct peer *peer)
 {
 	int ret = 0;
@@ -786,9 +787,9 @@ int bgp_nexthop_set(union sockunion *local, union sockunion *remote,
 	memset(nexthop, 0, sizeof(struct bgp_nexthop));
 
 	if (!local)
-		return -1;
+		return false;
 	if (!remote)
-		return -1;
+		return false;
 
 	if (local->sa.sa_family == AF_INET) {
 		nexthop->v4 = local->sin.sin_addr;
@@ -815,8 +816,24 @@ int bgp_nexthop_set(union sockunion *local, union sockunion *remote,
 						      peer->bgp->vrf_id);
 	}
 
-	if (!ifp)
+	if (!ifp) {
-		return -1;
+		/*
+		 * BGP views do not currently get proper data
+		 * from zebra( when attached ) to be able to
+		 * properly resolve nexthops, so give this
+		 * instance type a pass.
+		 */
+		if (peer->bgp->inst_type == BGP_INSTANCE_TYPE_VIEW)
+			return true;
+		/*
+		 * If we have no interface data but we have established
+		 * some connection w/ zebra than something has gone
+		 * terribly terribly wrong here, so say this failed
+		 * If we do not any zebra connection then not
+		 * having a ifp pointer is ok.
+		 */
+		return zclient_num_connects ? false : true;
+	}
 
 	nexthop->ifp = ifp;
 
@@ -912,7 +929,7 @@ int bgp_nexthop_set(union sockunion *local, union sockunion *remote,
 
 	/* If we have identified the local interface, there is no error for now.
 	 */
-	return 0;
+	return true;
 }
 
 static struct in6_addr *bgp_info_to_ipv6_nexthop(struct bgp_info *info,

bgpd/bgp_zebra.h

@@ -73,6 +73,9 @@ extern int bgp_zebra_advertise_all_vni(struct bgp *, int);
 
 extern int bgp_zebra_num_connects(void);
 
+extern bool bgp_zebra_nexthop_set(union sockunion *, union sockunion *,
+				  struct bgp_nexthop *, struct peer *);
+
 struct bgp_pbr_action;
 struct bgp_pbr_match;
 struct bgp_pbr_match_entry;

bgpd/bgpd.h

@@ -1470,8 +1470,6 @@ extern void bgp_terminate(void);
 extern void bgp_reset(void);
 extern time_t bgp_clock(void);
 extern void bgp_zclient_reset(void);
-extern int bgp_nexthop_set(union sockunion *, union sockunion *,
-			   struct bgp_nexthop *, struct peer *);
 extern struct bgp *bgp_get_default(void);
 extern struct bgp *bgp_lookup(as_t, const char *);
 extern struct bgp *bgp_lookup_by_name(const char *);