6to4: Connectivity check was done too early

The 6to4 code checks that we can connect to ipv6.connman.net
host via tunnel. The check can be done only after we have the
tunnel up and running. The patch makes sure that we do the
checks only after we have got newlink message from rtnl.

1 files changed, 71 insertions, 13 deletions

diff --git a/src/6to4.c b/src/6to4.c
index 802a1dfc..c75af94f 100644
--- a/src/6to4.c
+++ b/src/6to4.c
@@ -49,6 +49,9 @@ static int tunnel_pending;
 static char *tunnel_ip_address;
 static GWeb *web;
 static guint web_request_id;
+static unsigned int newlink_watch;
+static unsigned int newlink_flags;
+static int newlink_timeout_id;
 
 #define STATUS_URL "http://ipv6.connman.net/online/status.html"
 
@@ -256,6 +259,71 @@ static void web_debug(const char *str, void *data)
 	connman_info("%s: %s\n", (const char *) data, str);
 }
 
+static gboolean newlink_timeout(gpointer user_data)
+{
+	/*
+	 * Stop if the timeout has been cancelled already by tun_newlink()
+	 */
+	if (newlink_timeout_id == 0)
+		return FALSE;
+
+	DBG("");
+
+	if (newlink_watch != 0) {
+		connman_rtnl_remove_watch(newlink_watch);
+		newlink_watch = 0;
+	}
+
+	newlink_flags = 0;
+
+	if (web_request_id == 0)
+		tunnel_destroy();
+
+	newlink_timeout_id = 0;
+
+	return FALSE;
+}
+
+static void tun_newlink(unsigned flags, unsigned change, void *user_data)
+{
+	int index = GPOINTER_TO_INT(user_data);
+
+	if ((newlink_flags & IFF_UP) == (flags & IFF_UP)) {
+		newlink_flags = flags;
+		return;
+	}
+
+	if (flags & IFF_UP) {
+		/*
+		 * We try to verify that connectivity through tunnel works ok.
+		 */
+		if (newlink_timeout_id > 0) {
+			g_source_remove(newlink_timeout_id);
+			newlink_timeout_id = 0;
+		}
+
+		web = g_web_new(index);
+		if (web == NULL) {
+			tunnel_destroy();
+			return;
+		}
+
+		g_web_set_accept(web, NULL);
+		g_web_set_user_agent(web, "ConnMan/%s", VERSION);
+		g_web_set_close_connection(web, TRUE);
+
+		if (getenv("CONNMAN_WEB_DEBUG"))
+			g_web_set_debug(web, web_debug, "6to4");
+
+		web_request_id = g_web_request_get(web, STATUS_URL,
+						web_result, NULL);
+
+		newlink_timeout(NULL);
+	}
+
+	newlink_flags = flags;
+}
+
 static int init_6to4(struct in_addr *ip4addr)
 {
 	unsigned int a, b, c, d;
@@ -293,20 +361,10 @@ static int init_6to4(struct in_addr *ip4addr)
 	if (if_index < 0)
 		goto error;
 
-	/* We try to verify that connectivity through tunnel works ok.
-	 */
-	web = g_web_new(if_index);
-	if (web == NULL)
-		goto error;
-
-	g_web_set_accept(web, NULL);
-	g_web_set_user_agent(web, "ConnMan/%s", VERSION);
-	g_web_set_close_connection(web, TRUE);
-
-	if (getenv("CONNMAN_WEB_DEBUG"))
-		g_web_set_debug(web, web_debug, "6to4");
+	newlink_watch = connman_rtnl_add_newlink_watch(if_index,
+				tun_newlink, GINT_TO_POINTER(if_index));
 
-	web_request_id = g_web_request_get(web, STATUS_URL, web_result, NULL);
+	newlink_timeout_id = g_timeout_add_seconds(1, newlink_timeout, NULL);
 
 	return 0;