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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.
 *
 *  $Id: if_tun.h,v 1.1 2004-01-28 15:25:37 giacomo Exp $
 */

#ifndef __IF_TUN_H
#define __IF_TUN_H

/* Uncomment to enable debugging */
/* #define TUN_DEBUG 1 */

#ifdef __KERNEL__

#ifdef TUN_DEBUG
#define DBG  if(tun->debug)printk
#define DBG1 if(debug==2)printk
#else
#define DBG( a... )
#define DBG1( a... )
#endif

struct tun_struct {
        struct list_head        list;
        unsigned long           flags;
        int                     attached;
        uid_t                   owner;

        wait_queue_head_t       read_wait;
        struct sk_buff_head     readq;

        struct net_device       *dev;
        struct net_device_stats stats;

        struct fasync_struct    *fasync;

#ifdef TUN_DEBUG       
        int debug;
#endif  
};

#endif /* __KERNEL__ */

/* Read queue size */
#define TUN_READQ_SIZE  10

/* 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
#define TUN_ONE_QUEUE   0x0080
#define TUN_PERSIST     0x0100 

/* 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)

/* TUNSETIFF ifr flags */
#define IFF_TUN         0x0001
#define IFF_TAP         0x0002
#define IFF_NO_PI       0x1000
#define IFF_ONE_QUEUE   0x2000

struct tun_pi {
        unsigned short flags;
        unsigned short proto;
};
#define TUN_PKT_STRIP   0x0001

#endif /* __IF_TUN_H */