include/uapi/linux/if_tun.h

   1 /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
   2 /*
   3  *  Universal TUN/TAP device driver.
   4  *  Copyright (C) 1999-2000 Maxim Krasnyansky <max_mk@yahoo.com>
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14  *  GNU General Public License for more details.
  15  */
  16
  17 #ifndef __IF_TUN_H
  18 #define __IF_TUN_H
  19
  20 #include <linux/types.h>
  21 #include <linux/if_ether.h>
  22 #include <linux/filter.h>
  23
  24 /* Read queue size */
  25 #define TUN_READQ_SIZE  500
  26 /* TUN device type flags: deprecated. Use IFF_TUN/IFF_TAP instead. */
  27 #define TUN_TUN_DEV     IFF_TUN
  28 #define TUN_TAP_DEV     IFF_TAP
  29 #define TUN_TYPE_MASK   0x000f
  30
  31 /* Ioctl defines */
  32 #define TUNSETNOCSUM  _IOW('T', 200, int)
  33 #define TUNSETDEBUG   _IOW('T', 201, int)
  34 #define TUNSETIFF     _IOW('T', 202, int)
  35 #define TUNSETPERSIST _IOW('T', 203, int)
  36 #define TUNSETOWNER   _IOW('T', 204, int)
  37 #define TUNSETLINK    _IOW('T', 205, int)
  38 #define TUNSETGROUP   _IOW('T', 206, int)
  39 #define TUNGETFEATURES _IOR('T', 207, unsigned int)
  40 #define TUNSETOFFLOAD  _IOW('T', 208, unsigned int)
  41 #define TUNSETTXFILTER _IOW('T', 209, unsigned int)
  42 #define TUNGETIFF      _IOR('T', 210, unsigned int)
  43 #define TUNGETSNDBUF   _IOR('T', 211, int)
  44 #define TUNSETSNDBUF   _IOW('T', 212, int)
  45 #define TUNATTACHFILTER _IOW('T', 213, struct sock_fprog)
  46 #define TUNDETACHFILTER _IOW('T', 214, struct sock_fprog)
  47 #define TUNGETVNETHDRSZ _IOR('T', 215, int)
  48 #define TUNSETVNETHDRSZ _IOW('T', 216, int)
  49 #define TUNSETQUEUE  _IOW('T', 217, int)
  50 #define TUNSETIFINDEX   _IOW('T', 218, unsigned int)
  51 #define TUNGETFILTER _IOR('T', 219, struct sock_fprog)
  52 #define TUNSETVNETLE _IOW('T', 220, int)
  53 #define TUNGETVNETLE _IOR('T', 221, int)
  54 /* The TUNSETVNETBE and TUNGETVNETBE ioctls are for cross-endian support on
  55  * little-endian hosts. Not all kernel configurations support them, but all
  56  * configurations that support SET also support GET.
  57  */
  58 #define TUNSETVNETBE _IOW('T', 222, int)
  59 #define TUNGETVNETBE _IOR('T', 223, int)
  60 #define TUNSETSTEERINGEBPF _IOR('T', 224, int)
  61
  62 /* TUNSETIFF ifr flags */
  63 #define IFF_TUN         0x0001
  64 #define IFF_TAP         0x0002
  65 #define IFF_NAPI        0x0010
  66 #define IFF_NAPI_FRAGS  0x0020
  67 #define IFF_NO_PI       0x1000
  68 /* This flag has no real effect */
  69 #define IFF_ONE_QUEUE   0x2000
  70 #define IFF_VNET_HDR    0x4000
  71 #define IFF_TUN_EXCL    0x8000
  72 #define IFF_MULTI_QUEUE 0x0100
  73 #define IFF_ATTACH_QUEUE 0x0200
  74 #define IFF_DETACH_QUEUE 0x0400
  75 /* read-only flag */
  76 #define IFF_PERSIST     0x0800
  77 #define IFF_NOFILTER    0x1000
  78
  79 /* Socket options */
  80 #define TUN_TX_TIMESTAMP 1
  81
  82 /* Features for GSO (TUNSETOFFLOAD). */
  83 #define TUN_F_CSUM      0x01    /* You can hand me unchecksummed packets. */
  84 #define TUN_F_TSO4      0x02    /* I can handle TSO for IPv4 packets */
  85 #define TUN_F_TSO6      0x04    /* I can handle TSO for IPv6 packets */
  86 #define TUN_F_TSO_ECN   0x08    /* I can handle TSO with ECN bits. */
  87 #define TUN_F_UFO       0x10    /* I can handle UFO packets */
  88
  89 /* Protocol info prepended to the packets (when IFF_NO_PI is not set) */
  90 #define TUN_PKT_STRIP   0x0001
  91 struct tun_pi {
  92         __u16  flags;
  93         __be16 proto;
  94 };
  95
  96 /*
  97  * Filter spec (used for SETXXFILTER ioctls)
  98  * This stuff is applicable only to the TAP (Ethernet) devices.
  99  * If the count is zero the filter is disabled and the driver accepts
 100  * all packets (promisc mode).
 101  * If the filter is enabled in order to accept broadcast packets
 102  * broadcast addr must be explicitly included in the addr list.
 103  */
 104 #define TUN_FLT_ALLMULTI 0x0001 /* Accept all multicast packets */
 105 struct tun_filter {
 106         __u16  flags; /* TUN_FLT_ flags see above */
 107         __u16  count; /* Number of addresses */
 108         __u8   addr[0][ETH_ALEN];
 109 };
 110
 111 #endif /* __IF_TUN_H */