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 1.2 2001/06/01 18:39:47 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         struct list_head        list;
  36         unsigned long           flags;
  37         int                     attached;
  38         uid_t                   owner;
  39         gid_t                   group;
  40
  41         wait_queue_head_t       read_wait;
  42         struct sk_buff_head     readq;
  43
  44         struct net_device       *dev;
  45         struct net_device_stats stats;
  46
  47         struct fasync_struct    *fasync;
  48
  49         unsigned long if_flags;
  50         u8 dev_addr[ETH_ALEN];
  51         u32 chr_filter[2];
  52         u32 net_filter[2];
  53
  54 #ifdef TUN_DEBUG
  55         int debug;
  56 #endif
  57 };
  58
  59 #endif /* __KERNEL__ */
  60
  61 /* Read queue size */
  62 #define TUN_READQ_SIZE  500
  63
  64 /* TUN device flags */
  65 #define TUN_TUN_DEV     0x0001
  66 #define TUN_TAP_DEV     0x0002
  67 #define TUN_TYPE_MASK   0x000f
  68
  69 #define TUN_FASYNC      0x0010
  70 #define TUN_NOCHECKSUM  0x0020
  71 #define TUN_NO_PI       0x0040
  72 #define TUN_ONE_QUEUE   0x0080
  73 #define TUN_PERSIST     0x0100
  74
  75 /* Ioctl defines */
  76 #define TUNSETNOCSUM  _IOW('T', 200, int)
  77 #define TUNSETDEBUG   _IOW('T', 201, int)
  78 #define TUNSETIFF     _IOW('T', 202, int)
  79 #define TUNSETPERSIST _IOW('T', 203, int)
  80 #define TUNSETOWNER   _IOW('T', 204, int)
  81 #define TUNSETLINK    _IOW('T', 205, int)
  82 #define TUNSETGROUP   _IOW('T', 206, int)
  83
  84 /* TUNSETIFF ifr flags */
  85 #define IFF_TUN         0x0001
  86 #define IFF_TAP         0x0002
  87 #define IFF_NO_PI       0x1000
  88 #define IFF_ONE_QUEUE   0x2000
  89
  90 struct tun_pi {
  91         unsigned short flags;
  92         unsigned short proto;
  93 };
  94 #define TUN_PKT_STRIP   0x0001
  95
  96 #endif /* __IF_TUN_H */