Implement rxcost configuration keyword.

config.c

@@ -357,7 +357,15 @@ parse_nconf(gnc_t gnc, void *closure)
         if(c < -1)
             goto error;
 
-        goto error;             /* for now */
+        if(strcmp(token, "rxcost") == 0) {
+            int cost;
+            c = getint(c, &cost, gnc, closure);
+            if(c < -1 || cost <= 0 || cost > 0xFFFF)
+                goto error;
+            nconf->cost = cost;
+        } else {
+            goto error;
+        }
     }
 
     return nconf;

network.c

@@ -261,12 +261,14 @@ network_up(struct network *net, int up)
 
         if(wired) {
             net->flags |= NET_WIRED;
-            net->cost = 96;
+            net->cost =
+                net->conf && net->conf->cost > 0 ? net->conf->cost : 96;
             if(split_horizon)
                 net->flags |= NET_SPLIT_HORIZON;
         } else {
             net->flags &= ~NET_WIRED;
-            net->cost = 256;
+            net->cost =
+                net->conf && net->conf->cost > 0 ? net->conf->cost : 256;
         }
         update_hello_interval(net);
 

network.h

@@ -29,6 +29,7 @@ struct buffered_update {
 
 struct network_conf {
     char *ifname;
+    unsigned short cost;
     struct network_conf *next;
 };