kernel: Add an event kernel interfaces can raise if they create/destroy a TUN device

src/libhydra/kernel/kernel_interface.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2008-2012 Tobias Brunner
+ * Copyright (C) 2008-2013 Tobias Brunner
  * Hochschule fuer Technik Rapperswil
  * Copyright (C) 2010 Martin Willi
  * Copyright (C) 2010 revosec AG
@@ -644,6 +644,25 @@ METHOD(kernel_interface_t, roam, void,
 	this->mutex->unlock(this->mutex);
 }
 
+METHOD(kernel_interface_t, tun, void,
+	private_kernel_interface_t *this, tun_device_t *tun, bool created)
+{
+	kernel_listener_t *listener;
+	enumerator_t *enumerator;
+	this->mutex->lock(this->mutex);
+	enumerator = this->listeners->create_enumerator(this->listeners);
+	while (enumerator->enumerate(enumerator, &listener))
+	{
+		if (listener->tun &&
+			!listener->tun(listener, tun, created))
+		{
+			this->listeners->remove_at(this->listeners, enumerator);
+		}
+	}
+	enumerator->destroy(enumerator);
+	this->mutex->unlock(this->mutex);
+}
+
 METHOD(kernel_interface_t, register_algorithm, void,
 	private_kernel_interface_t *this, u_int16_t alg_id, transform_type_t type,
 	u_int16_t kernel_id, char *kernel_name)
@@ -764,6 +783,7 @@ kernel_interface_t *kernel_interface_create()
 			.mapping = _mapping,
 			.migrate = _migrate,
 			.roam = _roam,
+			.tun = _tun,
 			.destroy = _destroy,
 		},
 		.mutex = mutex_create(MUTEX_TYPE_DEFAULT),

src/libhydra/kernel/kernel_interface.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2006-2012 Tobias Brunner
+ * Copyright (C) 2006-2013 Tobias Brunner
  * Copyright (C) 2006 Daniel Roethlisberger
  * Copyright (C) 2005-2006 Martin Willi
  * Copyright (C) 2005 Jan Hutter
@@ -561,6 +561,14 @@ struct kernel_interface_t {
 	 */
 	void (*roam)(kernel_interface_t *this, bool address);
 
+	/**
+	 * Raise a tun event.
+	 *
+	 * @param tun			TUN device
+	 * @param created		TRUE if created, FALSE if going to be destroyed
+	 */
+	void (*tun)(kernel_interface_t *this, tun_device_t *tun, bool created);
+
 	/**
 	 * Register a new algorithm with the kernel interface.
 	 *

src/libhydra/kernel/kernel_listener.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2010 Tobias Brunner
+ * Copyright (C) 2010-2013 Tobias Brunner
  * Hochschule fuer Technik Rapperswil
  *
  * This program is free software; you can redistribute it and/or modify it
@@ -23,9 +23,10 @@
 
 typedef struct kernel_listener_t kernel_listener_t;
 
-#include <kernel/kernel_ipsec.h>
-#include <selectors/traffic_selector.h>
 #include <networking/host.h>
+#include <networking/tun_device.h>
+#include <selectors/traffic_selector.h>
+#include <kernel/kernel_ipsec.h>
 
 /**
  * Interface for components interested in kernel events.
@@ -91,6 +92,15 @@ struct kernel_listener_t {
 	 * @return				TRUE to remain registered, FALSE to unregister
 	 */
 	bool (*roam)(kernel_listener_t *this, bool address);
+
+	/**
+	 * Hook called after a TUN device was created for a virtual IP address, or
+	 * before such a device gets destroyed.
+	 *
+	 * @param tun			TUN device
+	 * @param created		TRUE if created, FALSE if going to be destroyed
+	 */
+	bool (*tun)(kernel_listener_t *this, tun_device_t *tun, bool created);
 };
 
 #endif /** KERNEL_LISTENER_H_ @}*/