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 #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
  55 /* TUNSETIFF ifr flags */
  56 #define IFF_TUN         0x0001
  57 #define IFF_TAP         0x0002
  58 #define IFF_NO_PI       0x1000
  59 #define IFF_ONE_QUEUE   0x2000
  60 #define IFF_VNET_HDR    0x4000
  61 #define IFF_TUN_EXCL    0x8000
  62
  63 /* Features for GSO (TUNSETOFFLOAD). */
  64 #define TUN_F_CSUM      0x01    /* You can hand me unchecksummed packets. */
  65 #define TUN_F_TSO4      0x02    /* I can handle TSO for IPv4 packets */
  66 #define TUN_F_TSO6      0x04    /* I can handle TSO for IPv6 packets */
  67 #define TUN_F_TSO_ECN   0x08    /* I can handle TSO with ECN bits. */
  68 #define TUN_F_UFO       0x10    /* I can handle UFO packets */
  69
  70 /* Protocol info prepended to the packets (when IFF_NO_PI is not set) */
  71 #define TUN_PKT_STRIP   0x0001
  72 struct tun_pi {
  73         __u16  flags;
  74         __be16 proto;
  75 };
  76
  77 /*
  78  * Filter spec (used for SETXXFILTER ioctls)
  79  * This stuff is applicable only to the TAP (Ethernet) devices.
  80  * If the count is zero the filter is disabled and the driver accepts
  81  * all packets (promisc mode).
  82  * If the filter is enabled in order to accept broadcast packets
  83  * broadcast addr must be explicitly included in the addr list.
  84  */
  85 #define TUN_FLT_ALLMULTI 0x0001 /* Accept all multicast packets */
  86 struct tun_filter {
  87         __u16  flags; /* TUN_FLT_ flags see above */
  88         __u16  count; /* Number of addresses */
  89         __u8   addr[0][ETH_ALEN];
  90 };
  91
  92 #ifdef __KERNEL__
  93 #if defined(CONFIG_TUN) || defined(CONFIG_TUN_MODULE)
  94 struct socket *tun_get_socket(struct file *);
  95 #else
  96 #include <linux/err.h>
  97 #include <linux/errno.h>
  98 struct file;
  99 struct socket;
 100 static inline struct socket *tun_get_socket(struct file *f)
 101 {
 102         return ERR_PTR(-EINVAL);
 103 }
 104 #endif /* CONFIG_TUN */
 105 #endif /* __KERNEL__ */
 106 #endif /* __IF_TUN_H */