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/*

 *  Universal TUN/TAP device driver.

 *  Copyright (C) 1999-2000 Maxim Krasnyansky <max_mk@yahoo.com>

 *

 *  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.

 *

 *  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 __IF_TUN_H

#define __IF_TUN_H

#include <linux/types.h>

#include <linux/if_ether.h>

#include <linux/filter.h>

/* Read queue size */

#define TUN_READQ_SIZE  500

/* TUN device flags */

#define TUN_TUN_DEV     0x0001  

#define TUN_TAP_DEV     0x0002

#define TUN_TYPE_MASK   0x000f

#define TUN_FASYNC      0x0010

#define TUN_NOCHECKSUM  0x0020

#define TUN_NO_PI       0x0040

/* This flag has no real effect */

#define TUN_ONE_QUEUE   0x0080

#define TUN_PERSIST     0x0100  

#define TUN_VNET_HDR    0x0200

#define TUN_TAP_MQ      0x0400

/* Ioctl defines */

#define TUNSETNOCSUM  _IOW('T', 200, int) 

#define TUNSETDEBUG   _IOW('T', 201, int) 

#define TUNSETIFF     _IOW('T', 202, int) 

#define TUNSETPERSIST _IOW('T', 203, int) 

#define TUNSETOWNER   _IOW('T', 204, int)

#define TUNSETLINK    _IOW('T', 205, int)

#define TUNSETGROUP   _IOW('T', 206, int)

#define TUNGETFEATURES _IOR('T', 207, unsigned int)

#define TUNSETOFFLOAD  _IOW('T', 208, unsigned int)

#define TUNSETTXFILTER _IOW('T', 209, unsigned int)

#define TUNGETIFF      _IOR('T', 210, unsigned int)

#define TUNGETSNDBUF   _IOR('T', 211, int)

#define TUNSETSNDBUF   _IOW('T', 212, int)

#define TUNATTACHFILTER _IOW('T', 213, struct sock_fprog)

#define TUNDETACHFILTER _IOW('T', 214, struct sock_fprog)

#define TUNGETVNETHDRSZ _IOR('T', 215, int)

#define TUNSETVNETHDRSZ _IOW('T', 216, int)

#define TUNSETQUEUE  _IOW('T', 217, int)

#define TUNSETIFINDEX   _IOW('T', 218, unsigned int)

#define TUNGETFILTER _IOR('T', 219, struct sock_fprog)

/* TUNSETIFF ifr flags */

#define IFF_TUN         0x0001

#define IFF_TAP         0x0002

#define IFF_NO_PI       0x1000

/* This flag has no real effect */

#define IFF_ONE_QUEUE   0x2000

#define IFF_VNET_HDR    0x4000

#define IFF_TUN_EXCL    0x8000

#define IFF_MULTI_QUEUE 0x0100

#define IFF_ATTACH_QUEUE 0x0200

#define IFF_DETACH_QUEUE 0x0400

/* read-only flag */

#define IFF_PERSIST     0x0800

#define IFF_NOFILTER    0x1000

/* Socket options */

#define TUN_TX_TIMESTAMP 1

/* Features for GSO (TUNSETOFFLOAD). */

#define TUN_F_CSUM      0x01    /* You can hand me unchecksummed packets. */

#define TUN_F_TSO4      0x02    /* I can handle TSO for IPv4 packets */

#define TUN_F_TSO6      0x04    /* I can handle TSO for IPv6 packets */

#define TUN_F_TSO_ECN   0x08    /* I can handle TSO with ECN bits. */

#define TUN_F_UFO       0x10    /* I can handle UFO packets */

/* Protocol info prepended to the packets (when IFF_NO_PI is not set) */

#define TUN_PKT_STRIP   0x0001

struct tun_pi {

        __u16  flags;

        __be16 proto;

};

/*

 * Filter spec (used for SETXXFILTER ioctls)

 * This stuff is applicable only to the TAP (Ethernet) devices.

 * If the count is zero the filter is disabled and the driver accepts

 * all packets (promisc mode).

 * If the filter is enabled in order to accept broadcast packets

 * broadcast addr must be explicitly included in the addr list.

 */

#define TUN_FLT_ALLMULTI 0x0001 /* Accept all multicast packets */

struct tun_filter {

        __u16  flags; /* TUN_FLT_ flags see above */

        __u16  count; /* Number of addresses */

        __u8   addr[0][ETH_ALEN];

};

#endif /* __IF_TUN_H */