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diff --git a/src/libcharon/sa/ikev2/tasks/ike_mid_sync.h b/src/libcharon/sa/ikev2/tasks/ike_mid_sync.h
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+++ b/src/libcharon/sa/ikev2/tasks/ike_mid_sync.h
@@ -0,0 +1,74 @@
+/*
+ * Copyright (C) 2016 Tobias Brunner
+ * 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
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+/*
+ * Copyright (C) 2016 Stephen J. Bevan
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+/**
+ * @defgroup ike_mid_sync ike_mid_sync
+ * @{ @ingroup tasks_v2
+ */
+
+#ifndef IKE_MID_SYNC_H_
+#define IKE_MID_SYNC_H_
+
+typedef struct ike_mid_sync_t ike_mid_sync_t;
+
+#include <library.h>
+#include <sa/ike_sa.h>
+#include <sa/task.h>
+
+/**
+ * Task of type TASK_IKE_MID_SYNC, implements RFC 6311 responder.
+ *
+ * This task handles an IKEV2_MESSAGE_ID_SYNC notify sent by a peer
+ * and if acceptable updates the SA MIDs and replies with the updated
+ * MID values.
+ */
+struct ike_mid_sync_t {
+
+	/**
+	 * Implements the task_t interface
+	 */
+	task_t task;
+};
+
+/**
+ * Create a new TASK_IKE_MID_SYNC task.
+ *
+ * @param ike_sa	IKE_SA this task works for
+ * @return			task to handle by the task_manager
+ */
+ike_mid_sync_t *ike_mid_sync_create(ike_sa_t *ike_sa);
+
+#endif /** IKE_MID_SYNC_H_ @}*/