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