bgpd: store nexthop info for redistributed IPV6 routes

BGP was ignoring nexthop info for static and other redistributed
routes for IPv6.  Build extra attribute info to store the nexthop.
See also:
  https://bugzilla.vyatta.com/show_bug.cgi?id=6073

3 files changed, 31 insertions, 12 deletions

diff --git a/bgpd/bgp_route.c b/bgpd/bgp_route.c
index b7716330..98e49bcd 100644
--- a/bgpd/bgp_route.c
+++ b/bgpd/bgp_route.c
@@ -5238,7 +5238,8 @@ ALIAS (no_ipv6_aggregate_address_summary_only,
 
 /* Redistribute route treatment. */
 void
-bgp_redistribute_add (struct prefix *p, struct in_addr *nexthop,
+bgp_redistribute_add (struct prefix *p, const struct in_addr *nexthop,
+		      const struct in6_addr *nexthop6,
 		      u_int32_t metric, u_char type)
 {
   struct bgp *bgp;
@@ -5258,6 +5259,15 @@ bgp_redistribute_add (struct prefix *p, struct in_addr *nexthop,
   if (nexthop)
     attr.nexthop = *nexthop;
 
+#ifdef HAVE_IPV6
+  if (nexthop6)
+    {
+      struct attr_extra *extra = bgp_attr_extra_get(&attr);
+      extra->mp_nexthop_global = *nexthop6;
+      extra->mp_nexthop_len = 16;
+    }
+#endif
+
   attr.med = metric;
   attr.flag |= ATTR_FLAG_BIT (BGP_ATTR_MULTI_EXIT_DISC);
 
diff --git a/bgpd/bgp_route.h b/bgpd/bgp_route.h
index 3e528596..7adc573b 100644
--- a/bgpd/bgp_route.h
+++ b/bgpd/bgp_route.h
@@ -192,7 +192,9 @@ extern int bgp_nlri_parse (struct peer *, struct attr *, struct bgp_nlri *);
 
 extern int bgp_maximum_prefix_overflow (struct peer *, afi_t, safi_t, int);
 
-extern void bgp_redistribute_add (struct prefix *, struct in_addr *, u_int32_t, u_char);
+extern void bgp_redistribute_add (struct prefix *, const struct in_addr *,
+				  const struct in6_addr *,
+				  u_int32_t, u_char);
 extern void bgp_redistribute_delete (struct prefix *, u_char);
 extern void bgp_redistribute_withdraw (struct bgp *, afi_t, int);
 
diff --git a/bgpd/bgp_zebra.c b/bgpd/bgp_zebra.c
index f3baeee0..d7af349a 100644
--- a/bgpd/bgp_zebra.c
+++ b/bgpd/bgp_zebra.c
@@ -281,7 +281,8 @@ zebra_read_ipv4 (int command, struct zclient *zclient, zebra_size_t length)
 		     inet_ntop(AF_INET, &nexthop, buf[1], sizeof(buf[1])),
 		     api.metric);
 	}
-      bgp_redistribute_add((struct prefix *)&p, &nexthop, api.metric, api.type);
+      bgp_redistribute_add((struct prefix *)&p, &nexthop, NULL,
+			   api.metric, api.type);
     }
   else
     {
@@ -356,23 +357,29 @@ zebra_read_ipv6 (int command, struct zclient *zclient, zebra_size_t length)
     {
       if (BGP_DEBUG(zebra, ZEBRA))
 	{
-	  char buf[INET6_ADDRSTRLEN];
-	  zlog_debug("Zebra rcvd: IPv6 route add %s %s/%d metric %u",
+	  char buf[2][INET6_ADDRSTRLEN];
+	  zlog_debug("Zebra rcvd: IPv6 route add %s %s/%d nexthop %s metric %u",
 		     zebra_route_string(api.type),
-		     inet_ntop(AF_INET6, &p.prefix, buf, sizeof(buf)),
-		     p.prefixlen, api.metric);
+		     inet_ntop(AF_INET6, &p.prefix, buf[0], sizeof(buf[0])),
+		     p.prefixlen,
+		     inet_ntop(AF_INET, &nexthop, buf[1], sizeof(buf[1])),
+		     api.metric);
 	}
-      bgp_redistribute_add ((struct prefix *)&p, NULL, api.metric, api.type);
+      bgp_redistribute_add ((struct prefix *)&p, NULL, &nexthop,
+			    api.metric, api.type);
     }
   else
     {
       if (BGP_DEBUG(zebra, ZEBRA))
 	{
-	  char buf[INET6_ADDRSTRLEN];
-	  zlog_debug("Zebra rcvd: IPv6 route delete %s %s/%d metric %u",
+	  char buf[2][INET6_ADDRSTRLEN];
+	  zlog_debug("Zebra rcvd: IPv6 route delete %s %s/%d "
+		     "nexthop %s metric %u",
 		     zebra_route_string(api.type),
-		     inet_ntop(AF_INET6, &p.prefix, buf, sizeof(buf)),
-		     p.prefixlen, api.metric);
+		     inet_ntop(AF_INET6, &p.prefix, buf[0], sizeof(buf[0])),
+		     p.prefixlen,
+		     inet_ntop(AF_INET6, &nexthop, buf[1], sizeof(buf[1])),
+		     api.metric);
 	}
       bgp_redistribute_delete ((struct prefix *) &p, api.type);
     }