Implement source-specific updates.

interface.h

@@ -96,6 +96,7 @@ struct interface {
     time_t bucket_time;
     unsigned int bucket;
     time_t last_update_time;
+    time_t last_specific_update_time;
     unsigned short hello_seqno;
     unsigned hello_interval;
     unsigned update_interval;

message.c

@@ -1488,6 +1488,9 @@ buffer_update(struct interface *ifp,
     ifp->num_buffered_updates++;
 }
 
+/* Full wildcard update with prefix == src_prefix == NULL,
+   Standard wildcard update with prefix == NULL && src_prefix != NULL,
+   Specific wildcard update with prefix != NULL && src_prefix == NULL. */
 void
 send_update(struct interface *ifp, int urgent,
             const unsigned char *prefix, unsigned char plen,
@@ -1512,12 +1515,12 @@ send_update(struct interface *ifp, int urgent,
     if(!if_up(ifp))
         return;
 
-    if(prefix) {
+    if(prefix && src_prefix) {
         debugf("Sending update to %s for %s from %s.\n",
                ifp->name, format_prefix(prefix, plen),
                format_prefix(src_prefix, src_plen));
         buffer_update(ifp, prefix, plen, src_prefix, src_plen);
-    } else {
+    } else if(prefix || src_prefix) {
         struct route_stream *routes;
         send_self_update(ifp);
         debugf("Sending update to %s for any.\n", ifp->name);
@@ -1527,6 +1530,9 @@ send_update(struct interface *ifp, int urgent,
                 struct babel_route *route = route_stream_next(routes);
                 if(route == NULL)
                     break;
+                if((src_prefix && route->src->src_plen != 0) ||
+                   (prefix && route->src->src_plen == 0))
+                    continue;
                 buffer_update(ifp, route->src->prefix, route->src->plen,
                               route->src->src_prefix, route->src->src_plen);
             }
@@ -1536,6 +1542,10 @@ send_update(struct interface *ifp, int urgent,
         }
         set_timeout(&ifp->update_timeout, ifp->update_interval);
         ifp->last_update_time = now.tv_sec;
+        ifp->last_specific_update_time = now.tv_sec;
+    } else {
+        send_update(ifp, urgent, NULL, 0, zeroes, 0);
+        send_update(ifp, urgent, zeroes, 0, NULL, 0);
     }
     schedule_update_flush(ifp, urgent);
 }