Define new per-interface flag unicast.

configuration.c

@@ -562,6 +562,12 @@ parse_anonymous_ifconf(int c, gnc_t gnc, void *closure,
             if(c < -1)
                 goto error;
             if_conf->faraway = v;
+        } else if(strcmp(token, "unicast") == 0) {
+            int v;
+            c = getbool(c, &v, gnc, closure);
+            if(c < -1)
+                goto error;
+            if_conf->unicast = v;
         } else if(strcmp(token, "link-quality") == 0) {
             int v;
             c = getbool(c, &v, gnc, closure);
@@ -713,6 +719,7 @@ merge_ifconf(struct interface_conf *dest,
     MERGE(split_horizon);
     MERGE(lq);
     MERGE(faraway);
+    MERGE(unicast);
     MERGE(channel);
     MERGE(enable_timestamps);
     MERGE(rfc6126);

interface.c

@@ -391,6 +391,9 @@ interface_up(struct interface *ifp, int up)
         if(IF_CONF(ifp, faraway) == CONFIG_YES)
             ifp->flags |= IF_FARAWAY;
 
+        if(IF_CONF(ifp, unicast) == CONFIG_YES)
+            ifp->flags |= IF_UNICAST;
+
         if(IF_CONF(ifp, hello_interval) > 0)
             ifp->hello_interval = IF_CONF(ifp, hello_interval);
         else if(type == IF_TYPE_WIRELESS)

interface.h

@@ -45,6 +45,7 @@ struct interface_conf {
     char split_horizon;
     char lq;
     char faraway;
+    char unicast;
     int channel;
     int enable_timestamps;
     int rfc6126;
@@ -69,6 +70,8 @@ struct interface_conf {
 #define IF_LQ (1 << 3)
 /* Nodes on the far end don't interfere with nodes on the near end. */
 #define IF_FARAWAY (1 << 4)
+/* Send most TLVs over unicast. */
+#define IF_UNICAST (1 << 5)
 /* Remain compatible with RFC 6126. */
 #define IF_RFC6126 (1 << 6)