linux/include/linux/if_tun.h
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   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#include <linux/filter.h>
  22
  23/* Read queue size */
  24#define TUN_READQ_SIZE  500
  25
  26/* TUN device flags */
  27#define TUN_TUN_DEV     0x0001  
  28#define TUN_TAP_DEV     0x0002
  29#define TUN_TYPE_MASK   0x000f
  30
  31#define TUN_FASYNC      0x0010
  32#define TUN_NOCHECKSUM  0x0020
  33#define TUN_NO_PI       0x0040
  34#define TUN_ONE_QUEUE   0x0080
  35#define TUN_PERSIST     0x0100  
  36#define TUN_VNET_HDR    0x0200
  37
  38/* Ioctl defines */
  39#define TUNSETNOCSUM  _IOW('T', 200, int) 
  40#define TUNSETDEBUG   _IOW('T', 201, int) 
  41#define TUNSETIFF     _IOW('T', 202, int) 
  42#define TUNSETPERSIST _IOW('T', 203, int) 
  43#define TUNSETOWNER   _IOW('T', 204, int)
  44#define TUNSETLINK    _IOW('T', 205, int)
  45#define TUNSETGROUP   _IOW('T', 206, int)
  46#define TUNGETFEATURES _IOR('T', 207, unsigned int)
  47#define TUNSETOFFLOAD  _IOW('T', 208, unsigned int)
  48#define TUNSETTXFILTER _IOW('T', 209, unsigned int)
  49#define TUNGETIFF      _IOR('T', 210, unsigned int)
  50#define TUNGETSNDBUF   _IOR('T', 211, int)
  51#define TUNSETSNDBUF   _IOW('T', 212, int)
  52#define TUNATTACHFILTER _IOW('T', 213, struct sock_fprog)
  53#define TUNDETACHFILTER _IOW('T', 214, struct sock_fprog)
  54#define TUNGETVNETHDRSZ _IOR('T', 215, int)
  55#define TUNSETVNETHDRSZ _IOW('T', 216, int)
  56
  57/* TUNSETIFF ifr flags */
  58#define IFF_TUN         0x0001
  59#define IFF_TAP         0x0002
  60#define IFF_NO_PI       0x1000
  61#define IFF_ONE_QUEUE   0x2000
  62#define IFF_VNET_HDR    0x4000
  63#define IFF_TUN_EXCL    0x8000
  64
  65/* Features for GSO (TUNSETOFFLOAD). */
  66#define TUN_F_CSUM      0x01    /* You can hand me unchecksummed packets. */
  67#define TUN_F_TSO4      0x02    /* I can handle TSO for IPv4 packets */
  68#define TUN_F_TSO6      0x04    /* I can handle TSO for IPv6 packets */
  69#define TUN_F_TSO_ECN   0x08    /* I can handle TSO with ECN bits. */
  70#define TUN_F_UFO       0x10    /* I can handle UFO packets */
  71
  72/* Protocol info prepended to the packets (when IFF_NO_PI is not set) */
  73#define TUN_PKT_STRIP   0x0001
  74struct tun_pi {
  75        __u16  flags;
  76        __be16 proto;
  77};
  78
  79/*
  80 * Filter spec (used for SETXXFILTER ioctls)
  81 * This stuff is applicable only to the TAP (Ethernet) devices.
  82 * If the count is zero the filter is disabled and the driver accepts
  83 * all packets (promisc mode).
  84 * If the filter is enabled in order to accept broadcast packets
  85 * broadcast addr must be explicitly included in the addr list.
  86 */
  87#define TUN_FLT_ALLMULTI 0x0001 /* Accept all multicast packets */
  88struct tun_filter {
  89        __u16  flags; /* TUN_FLT_ flags see above */
  90        __u16  count; /* Number of addresses */
  91        __u8   addr[0][ETH_ALEN];
  92};
  93
  94#ifdef __KERNEL__
  95#if defined(CONFIG_TUN) || defined(CONFIG_TUN_MODULE)
  96struct socket *tun_get_socket(struct file *);
  97#else
  98#include <linux/err.h>
  99#include <linux/errno.h>
 100struct file;
 101struct socket;
 102static inline struct socket *tun_get_socket(struct file *f)
 103{
 104        return ERR_PTR(-EINVAL);
 105}
 106#endif /* CONFIG_TUN */
 107#endif /* __KERNEL__ */
 108#endif /* __IF_TUN_H */
 109
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