implemented more aggressive MOBIKE path probing

do not queue more than one MOBIKE task

src/charon/sa/tasks/ike_mobike.c

@@ -447,6 +447,14 @@ static void roam(private_ike_mobike_t *this, bool address)
 							this->ike_sa->get_pending_updates(this->ike_sa) + 1);
 }
 
+/**
+ * Implementation of ike_mobike_t.is_probing.
+ */
+static bool is_probing(private_ike_mobike_t *this)
+{
+	return this->check;
+}
+
 /**
  * Implementation of task_t.get_type
  */
@@ -490,6 +498,7 @@ ike_mobike_t *ike_mobike_create(ike_sa_t *ike_sa, bool initiator)
 
 	this->public.roam = (void(*)(ike_mobike_t*,bool))roam;
 	this->public.transmit = (void(*)(ike_mobike_t*,packet_t*))transmit;
+	this->public.is_probing = (bool(*)(ike_mobike_t*))is_probing;
 	this->public.task.get_type = (task_type_t(*)(task_t*))get_type;
 	this->public.task.migrate = (void(*)(task_t*,ike_sa_t*))migrate;
 	this->public.task.destroy = (void(*)(task_t*))destroy;

src/charon/sa/tasks/ike_mobike.h

@@ -71,6 +71,14 @@ struct ike_mobike_t {
 	 * @param packet		the packet to transmit
 	 */
 	void (*transmit)(ike_mobike_t *this, packet_t *packet);
+	
+	/**
+	 * @brief Check if this task is probing for routability.
+	 *
+	 * @param this			calling object
+	 * @return				TRUE if task is probing
+	 */
+	bool (*is_probing)(ike_mobike_t *this);	
 };
 
 /**