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/*
* Copyright (C) 2012 Tobias Brunner
* Copyright (C) 2012 Giuliano Grassi
* Copyright (C) 2012 Ralf Sager
* 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.
*/
/**
* @defgroup tun_device tun_device
* @{ @ingroup networking
*/
#ifndef TUN_DEVICE_H_
#define TUN_DEVICE_H_
#include <networking/host.h>
typedef struct tun_device_t tun_device_t;
/**
* Class to create TUN devices
*
* Creating such a device requires the CAP_NET_ADMIN capability.
*/
struct tun_device_t {
/**
* Read a packet from the TUN device
*
* @note This call blocks until a packet is available. It is a thread
* cancellation point.
*
* @param packet the packet read from the device, allocated
* @return TRUE if successful
*/
bool (*read_packet)(tun_device_t *this, chunk_t *packet);
/**
* Write a packet to the TUN device
*
* @param packet the packet to write to the TUN device
* @return TRUE if successful
*/
bool (*write_packet)(tun_device_t *this, chunk_t packet);
/**
* Set the IP address of the device
*
* @param addr the desired interface address
* @param netmask the netmask to use
* @return TRUE if operation successful
*/
bool (*set_address)(tun_device_t *this, host_t *addr, u_int8_t netmask);
/**
* Get the IP address previously assigned to using set_address().
*
* @param netmask pointer receiving the configured netmask, or NULL
* @return address previously set, NULL if none
*/
host_t* (*get_address)(tun_device_t *this, u_int8_t *netmask);
/**
* Bring the TUN device up
*
* @return TRUE if operation successful
*/
bool (*up)(tun_device_t *this);
/**
* Set the MTU for this TUN device
*
* @param mtu new MTU
* @return TRUE if operation successful
*/
bool (*set_mtu)(tun_device_t *this, int mtu);
/**
* Get the current MTU for this TUN device
*
* @return current MTU
*/
int (*get_mtu)(tun_device_t *this);
/**
* Get the interface name of this device
*
* @return interface name
*/
char *(*get_name)(tun_device_t *this);
/**
* Get the underlying tun file descriptor.
*
* @return file descriptor of this tun device
*/
int (*get_fd)(tun_device_t *this);
/**
* Destroy a tun_device_t
*/
void (*destroy)(tun_device_t *this);
};
/**
* Create a TUN device using the given name template.
*
* @param name_tmpl name template, defaults to "tun%d" if not given
* @return TUN device
*/
tun_device_t *tun_device_create(const char *name_tmpl);
#endif /** TUN_DEVICE_H_ @}*/
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