chiark / gitweb /
More minor cleanups.
[tripe] / server / tun-linux.c
CommitLineData
37075862 1/* -*-c-*-
2 *
37075862 3 * Tunnel interface based on Linux TUN/TAP driver
4 *
5 * (c) 2003 Straylight/Edgeware
6 */
7
e04c2d50 8/*----- Licensing notice --------------------------------------------------*
37075862 9 *
10 * This file is part of Trivial IP Encryption (TrIPE).
11 *
12 * TrIPE is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
e04c2d50 16 *
37075862 17 * TrIPE is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
e04c2d50 21 *
37075862 22 * You should have received a copy of the GNU General Public License
23 * along with TrIPE; if not, write to the Free Software Foundation,
24 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
25 */
26
37075862 27/*----- Header files ------------------------------------------------------*/
28
42da2a58 29#define TUN_INTERNALS
30
37075862 31#include "tripe.h"
32
42da2a58 33#ifdef TUN_LINUX
34# include <sys/ioctl.h>
35# include <linux/if.h>
36# include <linux/if_tun.h>
37#endif
37075862 38
39/*----- Main code ---------------------------------------------------------*/
40
42da2a58 41#ifdef TUN_LINUX
42
43struct tunnel {
44 const tunnel_ops *ops; /* Pointer to operations */
45 sel_file f; /* Selector for TUN/TAP device */
46 struct peer *p; /* Pointer to my peer */
e04c2d50 47};
37075862 48
49/* --- @t_read@ --- *
50 *
51 * Arguments: @int fd@ = file descriptor to read
52 * @unsigned mode@ = what's happened
53 * @void *v@ = pointer to tunnel block
54 *
55 * Returns: ---
56 *
57 * Use: Reads data from the tunnel.
58 */
59
60static void t_read(int fd, unsigned mode, void *v)
61{
62 tunnel *t = v;
63 ssize_t n;
64 buf b;
65
66 n = read(fd, buf_i, sizeof(buf_i));
67 if (n < 0) {
72917fe7 68 a_warn("TUN", "%s", p_ifname(t->p), "read-error", "?ERRNO", A_END);
37075862 69 return;
70 }
71 IF_TRACING(T_TUNNEL, {
060ca767 72 trace(T_TUNNEL, "tun-linux: packet arrived");
73 trace_block(T_PACKET, "tun-linux: packet contents", buf_i, n);
37075862 74 })
75 buf_init(&b, buf_i, n);
76 p_tun(t->p, &b);
77}
78
42da2a58 79/* --- @t_init@ --- *
37075862 80 *
81 * Arguments: ---
82 *
83 * Returns: ---
84 *
85 * Use: Initializes the tunneling system. Maybe this will require
86 * opening file descriptors or something.
87 */
88
42da2a58 89static void t_init(void) { return; }
37075862 90
eb5f3fea
MW
91/* --- @t_create@ --- *
92 *
93 * Arguments: @peer *p@ = pointer to peer block
94 * @int fd@ = file descriptor of tunnel device
95 * @char **ifn@ = where to put the interface name
96 *
97 * Returns: A tunnel block if it worked, or null on failure.
98 *
99 * Use: Initializes a new tunnel.
100 */
101
102static tunnel *t_create(peer *p, int fd, char **ifn)
103{
104 tunnel *t;
105
106 fdflags(fd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC);
42da2a58 107 t = CREATE(tunnel);
108 t->ops = &tun_linux;
37075862 109 t->p = p;
110 sel_initfile(&sel, &t->f, fd, SEL_READ, t_read, t);
111 sel_addfile(&t->f);
42da2a58 112 return (t);
37075862 113}
114
42da2a58 115/* --- @t_inject@ --- *
37075862 116 *
117 * Arguments: @tunnel *t@ = pointer to tunnel block
118 * @buf *b@ = buffer to send
119 *
120 * Returns: ---
121 *
122 * Use: Injects a packet into the local network stack.
123 */
124
42da2a58 125static void t_inject(tunnel *t, buf *b)
37075862 126{
127 IF_TRACING(T_TUNNEL, {
060ca767 128 trace(T_TUNNEL, "tun-linux: inject decrypted packet");
37075862 129 trace_block(T_PACKET, "tunnel: packet contents", BBASE(b), BLEN(b));
130 })
131 write(t->f.fd, BBASE(b), BLEN(b));
132}
133
42da2a58 134/* --- @t_destroy@ --- *
37075862 135 *
136 * Arguments: @tunnel *t@ = pointer to tunnel block
137 *
138 * Returns: ---
139 *
140 * Use: Destroys a tunnel.
141 */
142
42da2a58 143static void t_destroy(tunnel *t)
6047fbac 144 { sel_rmfile(&t->f); close(t->f.fd); DESTROY(t); }
37075862 145
42da2a58 146const tunnel_ops tun_linux = {
147 "linux",
388e0319 148 TUNF_PRIVOPEN,
42da2a58 149 t_init,
150 t_create,
72917fe7 151 0,
42da2a58 152 t_inject,
153 t_destroy
154};
155
156#endif
157
37075862 158/*----- That's all, folks -------------------------------------------------*/