use MOBIKE enabled DPD if we are NATed

update SAs if we detect changes in NAT mappings

src/charon/sa/tasks/ike_natd.h

@@ -38,6 +38,15 @@ struct ike_natd_t {
 	 * Implements the task_t interface
 	 */
 	task_t task;
+	
+	/**
+	 * Check if the NAT mapping has changed for our address.
+	 *
+	 * MOBIKE uses NAT payloads in DPD to detect changes in the NAT mappings.
+	 *
+	 * @return 	TRUE if mappings have changed
+	 */
+	bool (*has_mapping_changed)(ike_natd_t *this);
 };
 
 /**