include/linux/if_tun.h

   1 /*
   2  *  Universal TUN/TAP device driver.
   3  *  Copyright (C) 1999-2000 Maxim Krasnyansky <max_mk@yahoo.com>
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 2 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  $Id: if_tun.h,v 1.1 2000/08/23 05:59:28 davem Exp $
  16  */
  17
  18 #ifndef __IF_TUN_H
  19 #define __IF_TUN_H
  20
  21 /* Uncomment to enable debugging */
  22 /* #define TUN_DEBUG 1 */
  23
  24 #ifdef __KERNEL__
  25
  26 #ifdef TUN_DEBUG
  27 #define DBG  if(tun->debug)printk
  28 #define DBG1 if(debug==2)printk
  29 #else
  30 #define DBG( a... )
  31 #define DBG1( a... )
  32 #endif
  33
  34 struct tun_struct {
  35         char                    name[8];
  36         unsigned long           flags;
  37
  38         struct fasync_struct    *fasync;
  39         wait_queue_head_t       read_wait;
  40
  41         struct net_device       dev;
  42         struct sk_buff_head     txq;
  43         struct net_device_stats stats;
  44
  45 #ifdef TUN_DEBUG
  46         int debug;
  47 #endif
  48 };
  49
  50 #ifndef MIN
  51 #define MIN(a,b) ( (a)<(b) ? (a):(b) )
  52 #endif
  53
  54 #endif /* __KERNEL__ */
  55
  56 /* Number of devices */
  57 #define TUN_MAX_DEV     255
  58
  59 /* TX queue size */
  60 #define TUN_TXQ_SIZE    10
  61
  62 /* Max frame size */
  63 #define TUN_MAX_FRAME   4096
  64
  65 /* TUN device flags */
  66 #define TUN_TUN_DEV     0x0001
  67 #define TUN_TAP_DEV     0x0002
  68 #define TUN_TYPE_MASK   0x000f
  69
  70 #define TUN_FASYNC      0x0010
  71 #define TUN_NOCHECKSUM  0x0020
  72 #define TUN_NO_PI       0x0040
  73
  74 #define TUN_IFF_SET     0x1000
  75
  76 /* Ioctl defines */
  77 #define TUNSETNOCSUM (('T'<< 8) | 200)
  78 #define TUNSETDEBUG  (('T'<< 8) | 201)
  79 #define TUNSETIFF    (('T'<< 8) | 202)
  80
  81 /* TUNSETIFF ifr flags */
  82 #define IFF_TUN         0x0001
  83 #define IFF_TAP         0x0002
  84 #define IFF_NO_PI       0x1000
  85
  86 struct tun_pi {
  87    unsigned short flags;
  88    unsigned short proto;
  89 };
  90 #define TUN_PKT_STRIP   0x0001
  91
  92 #endif /* __IF_TUN_H */