Implement -c.

babel.c

@@ -161,6 +161,11 @@ main(int argc, char **argv)
                 goto syntax;
         } else if(strcmp(*arg, "-P") == 0) {
             parasitic = 1;
+        } else if(strcmp(*arg, "-c") == 0) {
+            SHIFTE();
+            add_cost = atoi(*arg);
+            if(add_cost < 0 || add_cost > INFINITY)
+                goto syntax;
         } else if(strcmp(*arg, "-s") == 0) {
             split_horizon = 0;
         } else if(strcmp(*arg, "-b") == 0) {
@@ -485,9 +490,9 @@ main(int argc, char **argv)
             "                "
             "[-h hello_interval] [-H wired_hello_interval]\n"
             "                "
-            "[-u update_interval] [-k metric] [-s] [-P] [-d level]\n"
+            "[-u update_interval] [-k metric] [-s] [-P] [-c cost]\n"
             "                "
-            "[-n net cost]... address interface...\n",
+            "[-d level] [-n net cost]... address interface...\n",
             argv[0]);
     exit(1);
 

message.c

@@ -43,6 +43,7 @@ const unsigned char packet_header[4] = {42, 0, 0, 0};
 
 unsigned int jitter;
 unsigned int update_jitter;
+int add_cost = 0;
 int parasitic = 0;
 int silent_time = 30;
 int broadcast_txcost = 0;
@@ -384,7 +385,7 @@ flushupdates(void)
                        route->nexthop->network == net)
                         continue;
                     seqno = route->seqno;
-                    metric = route->metric;
+                    metric = MIN(route->metric + add_cost, INFINITY);
                 } else {
                     seqno = buffered_updates[i]->seqno;
                     metric = INFINITY;

message.h

@@ -26,6 +26,7 @@ extern int seqno_interval;
 
 extern unsigned int jitter;
 extern unsigned int update_jitter;
+extern int add_cost;
 extern int parasitic;
 extern int silent_time;
 extern int broadcast_txcost;