linuxstreams/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  */
  16
  17 #ifndef __IF_TUN_H
  18 #define __IF_TUN_H
  19
  20 /* Uncomment to enable debugging */
  21 /* #define TUN_DEBUG 1 */
  22
  23 #ifdef __KERNEL__
  24
  25 #ifdef TUN_DEBUG
  26 #define DBG  if(tun->debug)printk
  27 #define DBG1 if(debug==2)printk
  28 #else
  29 #define DBG( a... )
  30 #define DBG1( a... )
  31 #endif
  32
  33 struct tun_struct {
  34         char                    *name;
  35         unsigned long           flags;
  36         int                     attached;
  37         uid_t                   owner;
  38
  39         wait_queue_head_t       read_wait;
  40         struct sk_buff_head     readq;
  41
  42         struct net_device       dev;
  43         struct net_device_stats stats;
  44
  45         struct fasync_struct    *fasync;
  46
  47 #ifdef TUN_DEBUG
  48         int debug;
  49 #endif
  50 };
  51
  52 #ifndef MIN
  53 #define MIN(a,b) ( (a)<(b) ? (a):(b) )
  54 #endif
  55
  56 #endif /* __KERNEL__ */
  57
  58 /* Read queue size */
  59 #define TUN_READQ_SIZE  10
  60
  61 /* TUN device flags */
  62 #define TUN_TUN_DEV     0x0001
  63 #define TUN_TAP_DEV     0x0002
  64 #define TUN_TYPE_MASK   0x000f
  65
  66 #define TUN_FASYNC      0x0010
  67 #define TUN_NOCHECKSUM  0x0020
  68 #define TUN_NO_PI       0x0040
  69 #define TUN_ONE_QUEUE   0x0080
  70 #define TUN_PERSIST     0x0100
  71
  72 /* Ioctl defines */
  73 #define TUNSETNOCSUM  _IOW('T', 200, int)
  74 #define TUNSETDEBUG   _IOW('T', 201, int)
  75 #define TUNSETIFF     _IOW('T', 202, int)
  76 #define TUNSETPERSIST _IOW('T', 203, int)
  77 #define TUNSETOWNER   _IOW('T', 204, int)
  78
  79 /* TUNSETIFF ifr flags */
  80 #define IFF_TUN         0x0001
  81 #define IFF_TAP         0x0002
  82 #define IFF_NO_PI       0x1000
  83 #define IFF_ONE_QUEUE   0x2000
  84
  85 struct tun_pi {
  86         unsigned short flags;
  87         unsigned short proto;
  88 };
  89 #define TUN_PKT_STRIP   0x0001
  90
  91 #endif /* __IF_TUN_H */