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
  16 #ifndef __IF_TUN_H
  17 #define __IF_TUN_H
  18
  19 #include <linux/types.h>
  20 #include <linux/if_ether.h>
  21
  22 /* Read queue size */
  23 #define TUN_READQ_SIZE  500
  24
  25 /* TUN device flags */
  26 #define TUN_TUN_DEV     0x0001
  27 #define TUN_TAP_DEV     0x0002
  28 #define TUN_TYPE_MASK   0x000f
  29
  30 #define TUN_FASYNC      0x0010
  31 #define TUN_NOCHECKSUM  0x0020
  32 #define TUN_NO_PI       0x0040
  33 #define TUN_ONE_QUEUE   0x0080
  34 #define TUN_PERSIST     0x0100
  35 #define TUN_VNET_HDR    0x0200
  36
  37 /* Ioctl defines */
  38 #define TUNSETNOCSUM  _IOW('T', 200, int)
  39 #define TUNSETDEBUG   _IOW('T', 201, int)
  40 #define TUNSETIFF     _IOW('T', 202, int)
  41 #define TUNSETPERSIST _IOW('T', 203, int)
  42 #define TUNSETOWNER   _IOW('T', 204, int)
  43 #define TUNSETLINK    _IOW('T', 205, int)
  44 #define TUNSETGROUP   _IOW('T', 206, int)
  45 #define TUNGETFEATURES _IOR('T', 207, unsigned int)
  46 #define TUNSETOFFLOAD  _IOW('T', 208, unsigned int)
  47 #define TUNSETTXFILTER _IOW('T', 209, unsigned int)
  48 #define TUNGETIFF      _IOR('T', 210, unsigned int)
  49
  50 /* TUNSETIFF ifr flags */
  51 #define IFF_TUN         0x0001
  52 #define IFF_TAP         0x0002
  53 #define IFF_NO_PI       0x1000
  54 #define IFF_ONE_QUEUE   0x2000
  55 #define IFF_VNET_HDR    0x4000
  56
  57 /* Features for GSO (TUNSETOFFLOAD). */
  58 #define TUN_F_CSUM      0x01    /* You can hand me unchecksummed packets. */
  59 #define TUN_F_TSO4      0x02    /* I can handle TSO for IPv4 packets */
  60 #define TUN_F_TSO6      0x04    /* I can handle TSO for IPv6 packets */
  61 #define TUN_F_TSO_ECN   0x08    /* I can handle TSO with ECN bits. */
  62
  63 /* Protocol info prepended to the packets (when IFF_NO_PI is not set) */
  64 #define TUN_PKT_STRIP   0x0001
  65 struct tun_pi {
  66         __u16  flags;
  67         __be16 proto;
  68 };
  69
  70 /*
  71  * Filter spec (used for SETXXFILTER ioctls)
  72  * This stuff is applicable only to the TAP (Ethernet) devices.
  73  * If the count is zero the filter is disabled and the driver accepts
  74  * all packets (promisc mode).
  75  * If the filter is enabled in order to accept broadcast packets
  76  * broadcast addr must be explicitly included in the addr list.
  77  */
  78 #define TUN_FLT_ALLMULTI 0x0001 /* Accept all multicast packets */
  79 struct tun_filter {
  80         __u16  flags; /* TUN_FLT_ flags see above */
  81         __u16  count; /* Number of addresses */
  82         __u8   addr[0][ETH_ALEN];
  83 };
  84
  85 #endif /* __IF_TUN_H */