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/* TUN device type flags: deprecated. Use IFF_TUN/IFF_TAP instead. */
26#define TUN_TUN_DEV 	IFF_TUN
27#define TUN_TAP_DEV	IFF_TAP
28#define TUN_TYPE_MASK   0x000f
29
30/* Ioctl defines */
31#define TUNSETNOCSUM  _IOW('T', 200, int)
32#define TUNSETDEBUG   _IOW('T', 201, int)
33#define TUNSETIFF     _IOW('T', 202, int)
34#define TUNSETPERSIST _IOW('T', 203, int)
35#define TUNSETOWNER   _IOW('T', 204, int)
36#define TUNSETLINK    _IOW('T', 205, int)
37#define TUNSETGROUP   _IOW('T', 206, int)
38#define TUNGETFEATURES _IOR('T', 207, unsigned int)
39#define TUNSETOFFLOAD  _IOW('T', 208, unsigned int)
40#define TUNSETTXFILTER _IOW('T', 209, unsigned int)
41#define TUNGETIFF      _IOR('T', 210, unsigned int)
42#define TUNGETSNDBUF   _IOR('T', 211, int)
43#define TUNSETSNDBUF   _IOW('T', 212, int)
44#define TUNATTACHFILTER _IOW('T', 213, struct sock_fprog)
45#define TUNDETACHFILTER _IOW('T', 214, struct sock_fprog)
46#define TUNGETVNETHDRSZ _IOR('T', 215, int)
47#define TUNSETVNETHDRSZ _IOW('T', 216, int)
48#define TUNSETQUEUE  _IOW('T', 217, int)
49#define TUNSETIFINDEX	_IOW('T', 218, unsigned int)
50#define TUNGETFILTER _IOR('T', 219, struct sock_fprog)
51#define TUNSETVNETLE _IOW('T', 220, int)
52#define TUNGETVNETLE _IOR('T', 221, int)
53/* The TUNSETVNETBE and TUNGETVNETBE ioctls are for cross-endian support on
54 * little-endian hosts. Not all kernel configurations support them, but all
55 * configurations that support SET also support GET.
56 */
57#define TUNSETVNETBE _IOW('T', 222, int)
58#define TUNGETVNETBE _IOR('T', 223, int)
59
60/* TUNSETIFF ifr flags */
61#define IFF_TUN		0x0001
62#define IFF_TAP		0x0002
63#define IFF_NO_PI	0x1000
64/* This flag has no real effect */
65#define IFF_ONE_QUEUE	0x2000
66#define IFF_VNET_HDR	0x4000
67#define IFF_TUN_EXCL	0x8000
68#define IFF_MULTI_QUEUE 0x0100
69#define IFF_ATTACH_QUEUE 0x0200
70#define IFF_DETACH_QUEUE 0x0400
71/* read-only flag */
72#define IFF_PERSIST	0x0800
73#define IFF_NOFILTER	0x1000
74
75/* Socket options */
76#define TUN_TX_TIMESTAMP 1
77
78/* Features for GSO (TUNSETOFFLOAD). */
79#define TUN_F_CSUM	0x01	/* You can hand me unchecksummed packets. */
80#define TUN_F_TSO4	0x02	/* I can handle TSO for IPv4 packets */
81#define TUN_F_TSO6	0x04	/* I can handle TSO for IPv6 packets */
82#define TUN_F_TSO_ECN	0x08	/* I can handle TSO with ECN bits. */
83#define TUN_F_UFO	0x10	/* I can handle UFO packets */
84
85/* Protocol info prepended to the packets (when IFF_NO_PI is not set) */
86#define TUN_PKT_STRIP	0x0001
87struct tun_pi {
88	__u16  flags;
89	__be16 proto;
90};
91
92/*
93 * Filter spec (used for SETXXFILTER ioctls)
94 * This stuff is applicable only to the TAP (Ethernet) devices.
95 * If the count is zero the filter is disabled and the driver accepts
96 * all packets (promisc mode).
97 * If the filter is enabled in order to accept broadcast packets
98 * broadcast addr must be explicitly included in the addr list.
99 */
100#define TUN_FLT_ALLMULTI 0x0001 /* Accept all multicast packets */
101struct tun_filter {
102	__u16  flags; /* TUN_FLT_ flags see above */
103	__u16  count; /* Number of addresses */
104	__u8   addr[0][ETH_ALEN];
105};
106
107#endif /* __IF_TUN_H */
108