1 /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
2 /*
3  *  Universal TUN/TAP device driver.
4  *  Copyright (C) 1999-2000 Maxim Krasnyansky <max_mk@yahoo.com>
5  *
6  *  This program is free software; you can redistribute it and/or modify
7  *  it under the terms of the GNU General Public License as published by
8  *  the Free Software Foundation; either version 2 of the License, or
9  *  (at your option) any later version.
10  *
11  *  This program is distributed in the hope that it will be useful,
12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14  *  GNU General Public License for more details.
15  */
16 
17 #ifndef _UAPI__IF_TUN_H
18 #define _UAPI__IF_TUN_H
19 
20 #include <linux/types.h>
21 #include <linux/if_ether.h>
22 #include <linux/filter.h>
23 
24 /* Read queue size */
25 #define TUN_READQ_SIZE	500
26 /* TUN device type flags: deprecated. Use IFF_TUN/IFF_TAP instead. */
27 #define TUN_TUN_DEV 	IFF_TUN
28 #define TUN_TAP_DEV	IFF_TAP
29 #define TUN_TYPE_MASK   0x000f
30 
31 /* Ioctl defines */
32 #define TUNSETNOCSUM  _IOW('T', 200, int)
33 #define TUNSETDEBUG   _IOW('T', 201, int)
34 #define TUNSETIFF     _IOW('T', 202, int)
35 #define TUNSETPERSIST _IOW('T', 203, int)
36 #define TUNSETOWNER   _IOW('T', 204, int)
37 #define TUNSETLINK    _IOW('T', 205, int)
38 #define TUNSETGROUP   _IOW('T', 206, int)
39 #define TUNGETFEATURES _IOR('T', 207, unsigned int)
40 #define TUNSETOFFLOAD  _IOW('T', 208, unsigned int)
41 #define TUNSETTXFILTER _IOW('T', 209, unsigned int)
42 #define TUNGETIFF      _IOR('T', 210, unsigned int)
43 #define TUNGETSNDBUF   _IOR('T', 211, int)
44 #define TUNSETSNDBUF   _IOW('T', 212, int)
45 #define TUNATTACHFILTER _IOW('T', 213, struct sock_fprog)
46 #define TUNDETACHFILTER _IOW('T', 214, struct sock_fprog)
47 #define TUNGETVNETHDRSZ _IOR('T', 215, int)
48 #define TUNSETVNETHDRSZ _IOW('T', 216, int)
49 #define TUNSETQUEUE  _IOW('T', 217, int)
50 #define TUNSETIFINDEX	_IOW('T', 218, unsigned int)
51 #define TUNGETFILTER _IOR('T', 219, struct sock_fprog)
52 #define TUNSETVNETLE _IOW('T', 220, int)
53 #define TUNGETVNETLE _IOR('T', 221, int)
54 /* The TUNSETVNETBE and TUNGETVNETBE ioctls are for cross-endian support on
55  * little-endian hosts. Not all kernel configurations support them, but all
56  * configurations that support SET also support GET.
57  */
58 #define TUNSETVNETBE _IOW('T', 222, int)
59 #define TUNGETVNETBE _IOR('T', 223, int)
60 #define TUNSETSTEERINGEBPF _IOR('T', 224, int)
61 #define TUNSETFILTEREBPF _IOR('T', 225, int)
62 #define TUNSETCARRIER _IOW('T', 226, int)
63 #define TUNGETDEVNETNS _IO('T', 227)
64 
65 /* TUNSETIFF ifr flags */
66 #define IFF_TUN		0x0001
67 #define IFF_TAP		0x0002
68 #define IFF_NAPI	0x0010
69 #define IFF_NAPI_FRAGS	0x0020
70 #define IFF_NO_PI	0x1000
71 /* This flag has no real effect */
72 #define IFF_ONE_QUEUE	0x2000
73 #define IFF_VNET_HDR	0x4000
74 #define IFF_TUN_EXCL	0x8000
75 #define IFF_MULTI_QUEUE 0x0100
76 #define IFF_ATTACH_QUEUE 0x0200
77 #define IFF_DETACH_QUEUE 0x0400
78 /* read-only flag */
79 #define IFF_PERSIST	0x0800
80 #define IFF_NOFILTER	0x1000
81 
82 /* Socket options */
83 #define TUN_TX_TIMESTAMP 1
84 
85 /* Features for GSO (TUNSETOFFLOAD). */
86 #define TUN_F_CSUM	0x01	/* You can hand me unchecksummed packets. */
87 #define TUN_F_TSO4	0x02	/* I can handle TSO for IPv4 packets */
88 #define TUN_F_TSO6	0x04	/* I can handle TSO for IPv6 packets */
89 #define TUN_F_TSO_ECN	0x08	/* I can handle TSO with ECN bits. */
90 #define TUN_F_UFO	0x10	/* I can handle UFO packets */
91 
92 /* Protocol info prepended to the packets (when IFF_NO_PI is not set) */
93 #define TUN_PKT_STRIP	0x0001
94 struct tun_pi {
95 	__u16  flags;
96 	__be16 proto;
97 };
98 
99 /*
100  * Filter spec (used for SETXXFILTER ioctls)
101  * This stuff is applicable only to the TAP (Ethernet) devices.
102  * If the count is zero the filter is disabled and the driver accepts
103  * all packets (promisc mode).
104  * If the filter is enabled in order to accept broadcast packets
105  * broadcast addr must be explicitly included in the addr list.
106  */
107 #define TUN_FLT_ALLMULTI 0x0001 /* Accept all multicast packets */
108 struct tun_filter {
109 	__u16  flags; /* TUN_FLT_ flags see above */
110 	__u16  count; /* Number of addresses */
111 	__u8   addr[0][ETH_ALEN];
112 };
113 
114 #endif /* _UAPI__IF_TUN_H */
115