zebra: fix route deletion during zebra shutdown

Split zebra's vrf_terminate() into disable() and delete() stages.
The former enqueues all events for the dplane thread.
Memory freeing is performed in the second stage.

Signed-off-by: Alexander Skorichenko <askorichenko@netgate.com>

lib/vrf.c

@@ -326,6 +326,34 @@ void vrf_disable(struct vrf *vrf)
 		(*vrf_master.vrf_disable_hook)(vrf);
 }
 
+/* Disable VRF module. */
+void vrf_disable_all(void)
+{
+	struct vrf *vrf, *tmp;
+
+	if (debug_vrf)
+		zlog_debug("%s:  vrf subsystem", __func__);
+
+	RB_FOREACH_SAFE (vrf, vrf_id_head, &vrfs_by_id, tmp) {
+		if (vrf->vrf_id == VRF_DEFAULT)
+			continue;
+
+		vrf_disable(vrf);
+	}
+
+	RB_FOREACH_SAFE (vrf, vrf_name_head, &vrfs_by_name, tmp) {
+		if (vrf->vrf_id == VRF_DEFAULT)
+			continue;
+
+		vrf_disable(vrf);
+	}
+
+	/* Finally disable default VRF */
+	vrf = vrf_lookup_by_id(VRF_DEFAULT);
+	if (vrf)
+		vrf_disable(vrf);
+}
+
 const char *vrf_id_to_name(vrf_id_t vrf_id)
 {
 	struct vrf *vrf;

lib/vrf.h

@@ -203,8 +203,11 @@ extern void vrf_init(int (*create)(struct vrf *vrf),
 
 /*
  * Call vrf_terminate when the protocol is being shutdown
+ *     it implements disable() and destroy() hooks
+ * vrf_disable_all does disable() only
  */
 extern void vrf_terminate(void);
+extern void vrf_disable_all(void);
 
 /*
  * Utilities to create networks objects,

zebra/main.c

@@ -204,6 +204,8 @@ static void sigint(void)
 
 	list_delete(&zrouter.client_list);
 
+	vrf_disable_all();
+
 	/* Indicate that all new dplane work has been enqueued. When that
 	 * work is complete, the dataplane will enqueue an event
 	 * with the 'finalize' function.