Increase request seqno by 1 if destination metric is finite.

babel.c

@@ -758,7 +758,7 @@ expire_routes(void)
         if(route->installed && route->refmetric < INFINITY) {
             if(route->time < now.tv_sec - MAX(5, route_timeout_delay - 25))
                 send_unicast_request(route->nexthop, route->dest,
-                                     max_request_hopcount, -1);
+                                     max_request_hopcount, route->dest->seqno);
         }
         i++;
     }

message.c

@@ -364,7 +364,9 @@ send_request(struct network *net, struct destination *dest,
         if(seqno >= 0)
             accumulate_byte(net, seqno);
         else
-            accumulate_byte(net, dest->seqno);
+            accumulate_byte(net,
+                            dest->metric >= INFINITY ?
+                            dest->seqno : ((dest->seqno + 1) & 0xFF));
         accumulate_byte(net, hopcount);
     } else {
         accumulate_byte(net, 0);
@@ -399,7 +401,6 @@ send_unicast_packet(struct neighbour *neigh, unsigned char *buf, int buflen)
     }
 }
 
-
 void
 send_unicast_request(struct neighbour *neigh, struct destination *dest,
                      int hopcount, int seqno)
@@ -418,7 +419,9 @@ send_unicast_request(struct neighbour *neigh, struct destination *dest,
         if(seqno >= 0)
             buf[1] = seqno;
         else
-            buf[1] = dest->seqno;
+            buf[1] =
+                dest->metric >= INFINITY ?
+                dest->seqno : ((dest->seqno + 1) & 0xFF);
         buf[2] = hopcount;
     } else {
         buf[1] = 0;

route.c

@@ -439,7 +439,7 @@ send_triggered_update(struct route *route, int oldmetric)
         } else if(route->metric - oldmetric >= 384) {
             /* This route's metric has increased a lot -- let's hope we find
                something better */
-            send_request(NULL, route->dest, 1, -1);
+            send_request(NULL, route->dest, 1, route->seqno);
         }
     }
 }