ike-rekey: Add method to check if there was a rekey collision

src/libcharon/sa/ikev2/tasks/ike_rekey.c

@@ -380,6 +380,13 @@ METHOD(task_t, get_type, task_type_t,
 	return TASK_IKE_REKEY;
 }
 
+METHOD(ike_rekey_t, did_collide, bool,
+	private_ike_rekey_t *this)
+{
+	return this->collision &&
+		   this->collision->get_type(this->collision) == TASK_IKE_REKEY;
+}
+
 METHOD(ike_rekey_t, collide, void,
 	private_ike_rekey_t* this, task_t *other)
 {
@@ -444,6 +451,7 @@ ike_rekey_t *ike_rekey_create(ike_sa_t *ike_sa, bool initiator)
 				.migrate = _migrate,
 				.destroy = _destroy,
 			},
+			.did_collide = _did_collide,
 			.collide = _collide,
 		},
 		.ike_sa = ike_sa,

src/libcharon/sa/ikev2/tasks/ike_rekey.h

@@ -1,6 +1,7 @@
 /*
+ * Copyright (C) 2016 Tobias Brunner
  * Copyright (C) 2007 Martin Willi
- * Hochschule fuer Technik Rapperswil
+ * HSR Hochschule fuer Technik Rapperswil
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License as published by the
@@ -37,6 +38,13 @@ struct ike_rekey_t {
 	 */
 	task_t task;
 
+	/**
+	 * Check if there was a rekey collision.
+	 *
+	 * @return			TRUE if there was a rekey collision before
+	 */
+	bool (*did_collide)(ike_rekey_t *this);
+
 	/**
 	 * Register a rekeying task which collides with this one.
 	 *