if_tun.h revision 580fbd88f75cc9eea0d28a48c025b090eb9419a7 
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#define TUNGETSNDBUF   _IOR('T', 211, int)
50#define TUNSETSNDBUF   _IOW('T', 212, int)
51
52/* TUNSETIFF ifr flags */
53#define IFF_TUN		0x0001
54#define IFF_TAP		0x0002
55#define IFF_NO_PI	0x1000
56#define IFF_ONE_QUEUE	0x2000
57#define IFF_VNET_HDR	0x4000
58
59/* Features for GSO (TUNSETOFFLOAD). */
60#define TUN_F_CSUM	0x01	/* You can hand me unchecksummed packets. */
61#define TUN_F_TSO4	0x02	/* I can handle TSO for IPv4 packets */
62#define TUN_F_TSO6	0x04	/* I can handle TSO for IPv6 packets */
63#define TUN_F_TSO_ECN	0x08	/* I can handle TSO with ECN bits. */
64
65/* Protocol info prepended to the packets (when IFF_NO_PI is not set) */
66#define TUN_PKT_STRIP	0x0001
67struct tun_pi {
68	__u16  flags;
69	__be16 proto;
70};
71
72/*
73 * Filter spec (used for SETXXFILTER ioctls)
74 * This stuff is applicable only to the TAP (Ethernet) devices.
75 * If the count is zero the filter is disabled and the driver accepts
76 * all packets (promisc mode).
77 * If the filter is enabled in order to accept broadcast packets
78 * broadcast addr must be explicitly included in the addr list.
79 */
80#define TUN_FLT_ALLMULTI 0x0001 /* Accept all multicast packets */
81struct tun_filter {
82	__u16  flags; /* TUN_FLT_ flags see above */
83	__u16  count; /* Number of addresses */
84	__u8   addr[0][ETH_ALEN];
85};
86
87#endif /* __IF_TUN_H */
88