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 #define TUNGETVNETHDRSZ _IOR('T', 215, int)
55 #define TUNSETVNETHDRSZ _IOW('T', 216, int)
56
57 /* TUNSETIFF ifr flags */
58 #define IFF_TUN 0x0001
59 #define IFF_TAP 0x0002
60 #define IFF_NO_PI 0x1000
61 #define IFF_ONE_QUEUE 0x2000
62 #define IFF_VNET_HDR 0x4000
63 #define IFF_TUN_EXCL 0x8000
64
65 /* Features for GSO (TUNSETOFFLOAD). */
66 #define TUN_F_CSUM 0x01 /* You can hand me unchecksummed packets. */
67 #define TUN_F_TSO4 0x02 /* I can handle TSO for IPv4 packets */
68 #define TUN_F_TSO6 0x04 /* I can handle TSO for IPv6 packets */
69 #define TUN_F_TSO_ECN 0x08 /* I can handle TSO with ECN bits. */
70 #define TUN_F_UFO 0x10 /* I can handle UFO packets */
71
72 /* Protocol info prepended to the packets (when IFF_NO_PI is not set) */
73 #define TUN_PKT_STRIP 0x0001
74 struct tun_pi {
75 __u16 flags;
76 __be16 proto;
77 };
78
79 /*
80 * Filter spec (used for SETXXFILTER ioctls)
81 * This stuff is applicable only to the TAP (Ethernet) devices.
82 * If the count is zero the filter is disabled and the driver accepts
83 * all packets (promisc mode).
84 * If the filter is enabled in order to accept broadcast packets
85 * broadcast addr must be explicitly included in the addr list.
86 */
87 #define TUN_FLT_ALLMULTI 0x0001 /* Accept all multicast packets */
88 struct tun_filter {
89 __u16 flags; /* TUN_FLT_ flags see above */
90 __u16 count; /* Number of addresses */
91 __u8 addr[0][ETH_ALEN];
92 };
93
94 #ifdef __KERNEL__
95 #if defined(CONFIG_TUN) || defined(CONFIG_TUN_MODULE)
96 struct socket *tun_get_socket(struct file *);
97 #else
98 #include <linux/err.h>
99 #include <linux/errno.h>
100 struct file;
101 struct socket;
tun_get_socket(struct file * f)102 static inline struct socket *tun_get_socket(struct file *f)
103 {
104 return ERR_PTR(-EINVAL);
105 }
106 #endif /* CONFIG_TUN */
107 #endif /* __KERNEL__ */
108 #endif /* __IF_TUN_H */
109