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* Universal TUN/TAP device driver.
* Copyright (C) 1999-2000 Maxim Krasnyansky <>
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* GNU General Public License for more details.
#ifndef __IF_TUN_H
#define __IF_TUN_H
#include <linux/types.h>
#include <linux/if_ether.h>
#include <linux/filter.h>
/* Read queue size */
#define TUN_READQ_SIZE 500
/* TUN device type flags: deprecated. Use IFF_TUN/IFF_TAP instead. */
#define TUN_TYPE_MASK 0x000f
/* Ioctl defines */
#define TUNSETNOCSUM _IOW('T', 200, int)
#define TUNSETDEBUG _IOW('T', 201, int)
#define TUNSETIFF _IOW('T', 202, int)
#define TUNSETPERSIST _IOW('T', 203, int)
#define TUNSETOWNER _IOW('T', 204, int)
#define TUNSETLINK _IOW('T', 205, int)
#define TUNSETGROUP _IOW('T', 206, int)
#define TUNGETFEATURES _IOR('T', 207, unsigned int)
#define TUNSETOFFLOAD _IOW('T', 208, unsigned int)
#define TUNSETTXFILTER _IOW('T', 209, unsigned int)
#define TUNGETIFF _IOR('T', 210, unsigned int)
#define TUNGETSNDBUF _IOR('T', 211, int)
#define TUNSETSNDBUF _IOW('T', 212, int)
#define TUNATTACHFILTER _IOW('T', 213, struct sock_fprog)
#define TUNDETACHFILTER _IOW('T', 214, struct sock_fprog)
#define TUNGETVNETHDRSZ _IOR('T', 215, int)
#define TUNSETVNETHDRSZ _IOW('T', 216, int)
#define TUNSETQUEUE _IOW('T', 217, int)
#define TUNSETIFINDEX _IOW('T', 218, unsigned int)
#define TUNGETFILTER _IOR('T', 219, struct sock_fprog)
#define TUNSETVNETLE _IOW('T', 220, int)
#define TUNGETVNETLE _IOR('T', 221, int)
/* The TUNSETVNETBE and TUNGETVNETBE ioctls are for cross-endian support on
* little-endian hosts. Not all kernel configurations support them, but all
* configurations that support SET also support GET.
#define TUNSETVNETBE _IOW('T', 222, int)
#define TUNGETVNETBE _IOR('T', 223, int)
/* TUNSETIFF ifr flags */
#define IFF_TUN 0x0001
#define IFF_TAP 0x0002
#define IFF_NO_PI 0x1000
/* This flag has no real effect */
#define IFF_ONE_QUEUE 0x2000
#define IFF_VNET_HDR 0x4000
#define IFF_TUN_EXCL 0x8000
#define IFF_MULTI_QUEUE 0x0100
#define IFF_ATTACH_QUEUE 0x0200
#define IFF_DETACH_QUEUE 0x0400
/* read-only flag */
#define IFF_PERSIST 0x0800
#define IFF_NOFILTER 0x1000
/* Socket options */
/* Features for GSO (TUNSETOFFLOAD). */
#define TUN_F_CSUM 0x01 /* You can hand me unchecksummed packets. */
#define TUN_F_TSO4 0x02 /* I can handle TSO for IPv4 packets */
#define TUN_F_TSO6 0x04 /* I can handle TSO for IPv6 packets */
#define TUN_F_TSO_ECN 0x08 /* I can handle TSO with ECN bits. */
#define TUN_F_UFO 0x10 /* I can handle UFO packets */
/* Protocol info prepended to the packets (when IFF_NO_PI is not set) */
#define TUN_PKT_STRIP 0x0001
struct tun_pi {
__u16 flags;
__be16 proto;
* Filter spec (used for SETXXFILTER ioctls)
* This stuff is applicable only to the TAP (Ethernet) devices.
* If the count is zero the filter is disabled and the driver accepts
* all packets (promisc mode).
* If the filter is enabled in order to accept broadcast packets
* broadcast addr must be explicitly included in the addr list.
#define TUN_FLT_ALLMULTI 0x0001 /* Accept all multicast packets */
struct tun_filter {
__u16 flags; /* TUN_FLT_ flags see above */
__u16 count; /* Number of addresses */
__u8 addr[0][ETH_ALEN];
#endif /* __IF_TUN_H */