further MOBIKE stuff:

kernel properly reports network reconfiguration and informs all IKE_SAs
  MOBIKE in IKE_AUTH: MOBIKE_SUPPORTED notify and address exchange
  reestablishment of IKE_SAs on network reconfiguration kinda works
  not stable yet!

src/charon/sa/tasks/ike_mobike.h

@@ -0,0 +1,76 @@
+/**
+ * @file ike_mobike.h
+ * 
+ * @brief Interface ike_mobike_t.
+ * 
+ */
+
+/*
+ * Copyright (C) 2007 Martin Willi
+ * 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.
+ */
+
+#ifndef IKE_MOBIKE_H_
+#define IKE_MOBIKE_H_
+
+typedef struct ike_mobike_t ike_mobike_t;
+
+#include <library.h>
+#include <sa/ike_sa.h>
+#include <sa/tasks/task.h>
+
+/**
+ * @brief Task of type ike_mobike, detects and handles MOBIKE extension.
+ *
+ * The MOBIKE extension is defined in RFC4555. It allows to update IKE
+ * and IPsec tunnel addresses.
+ * This tasks handles the MOBIKE_SUPPORTED notify exchange to detect MOBIKE
+ * support, allows the exchange of ADDITIONAL_*_ADDRESS to exchange additional
+ * endpoints and handles the UPDATE_SA_ADDRESS notify to finally update 
+ * endpoints.
+ *
+ * @b Constructors:
+ *  - ike_mobike_create()
+ * 
+ * @ingroup tasks
+ */
+struct ike_mobike_t {
+
+	/**
+	 * Implements the task_t interface
+	 */
+	task_t task;
+	
+	/**
+	 * @brief Use the task to roam to other addresses.
+	 *
+	 * Supplied hosts may be NULL to reuse existing IKE_SA hosts.
+	 *
+	 * @param this			calling object
+	 * @param me			local host to roam to, or NULL
+	 * @param other			remote host to roam to, or NULL
+	 */
+	void (*roam)(ike_mobike_t *this, host_t *me, host_t *other);
+};
+
+/**
+ * @brief Create a new ike_mobike task.
+ *
+ * @param ike_sa		IKE_SA this task works for
+ * @param initiator		TRUE if taks is initiated by us
+ * @return			  	ike_mobike task to handle by the task_manager
+ */
+ike_mobike_t *ike_mobike_create(ike_sa_t *ike_sa, bool initiator);
+
+#endif /* IKE_MOBIKE_H_ */
+