Implement hello-interval configuration option.

config.c

@@ -363,6 +363,12 @@ parse_nconf(gnc_t gnc, void *closure)
             if(c < -1 || cost <= 0 || cost > 0xFFFF)
                 goto error;
             nconf->cost = cost;
+        } else if(strcmp(token, "hello-interval") == 0) {
+            int interval;
+            c = getint(c, &interval, gnc, closure);
+            if(c < -1 || interval <= 0 || interval > 0xFFFF)
+                goto error;
+            nconf->hello_interval = interval;
         } else {
             goto error;
         }

network.c

@@ -99,23 +99,21 @@ int
 update_hello_interval(struct network *net)
 {
     int rc = 0;
+    unsigned short interval;
+
+    if(network_idle(net))
+        interval = idle_hello_interval;
+    else if(NET_CONF(net, hello_interval, 0) > 0)
+        interval = NET_CONF(net, hello_interval, 0);
+    else if((net->flags & NET_WIRED))
+        interval = wired_hello_interval;
+    else
+        interval = wireless_hello_interval;
 
-    if(network_idle(net)) {
-        if(net->hello_interval != idle_hello_interval) {
-            net->hello_interval = idle_hello_interval;
-            rc = 1;
-        }
-    } else if((net->flags & NET_WIRED)) {
-        if(net->hello_interval != wired_hello_interval) {
-            net->hello_interval = wired_hello_interval;
+    if(net->hello_interval != interval) {
+        net->hello_interval = interval;
             rc = 1;
     }
-    } else {
-        if(net->hello_interval != wireless_hello_interval) {
-            net->hello_interval = wireless_hello_interval;
-            rc = 1;
-        }
-    }
 
     net->self_update_interval =
         MAX(update_interval / 2, net->hello_interval);

network.h

@@ -30,6 +30,7 @@ struct buffered_update {
 struct network_conf {
     char *ifname;
     unsigned short cost;
+    unsigned short hello_interval;
     struct network_conf *next;
 };