5 * Tunnel interface based on Linux TUN/TAP driver
7 * (c) 2003 Straylight/Edgeware
10 /*----- Licensing notice --------------------------------------------------*
12 * This file is part of Trivial IP Encryption (TrIPE).
14 * TrIPE is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
19 * TrIPE is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
24 * You should have received a copy of the GNU General Public License
25 * along with TrIPE; if not, write to the Free Software Foundation,
26 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
29 /*----- Header files ------------------------------------------------------*/
36 # include <sys/ioctl.h>
37 # include <linux/if.h>
38 # include <linux/if_tun.h>
41 /*----- Main code ---------------------------------------------------------*/
46 const tunnel_ops
*ops
; /* Pointer to operations */
47 sel_file f
; /* Selector for TUN/TAP device */
48 struct peer
*p
; /* Pointer to my peer */
49 char ifn
[IFNAMSIZ
]; /* Interface name buffer */
54 * Arguments: @int fd@ = file descriptor to read
55 * @unsigned mode@ = what's happened
56 * @void *v@ = pointer to tunnel block
60 * Use: Reads data from the tunnel.
63 static void t_read(int fd
, unsigned mode
, void *v
)
69 n
= read(fd
, buf_i
, sizeof(buf_i
));
71 a_warn("TUN", "%s", t
->ifn
, "read-error", "?ERRNO", A_END
);
74 IF_TRACING(T_TUNNEL
, {
75 trace(T_TUNNEL
, "tun-linux: packet arrived");
76 trace_block(T_PACKET
, "tun-linux: packet contents", buf_i
, n
);
78 buf_init(&b
, buf_i
, n
);
88 * Use: Initializes the tunneling system. Maybe this will require
89 * opening file descriptors or something.
92 static void t_init(void) { return; }
94 /* --- @t_create@ --- *
96 * Arguments: @peer *p@ = pointer to peer block
98 * Returns: A tunnel block if it worked, or null on failure.
100 * Use: Initializes a new tunnel.
103 static tunnel
*t_create(peer
*p
)
110 if ((fd
= open("/dev/net/tun", O_RDWR
)) < 0) {
111 a_warn("TUN", "-", "linux",
112 "open-error", "/dev/net/tun", "?ERRNO",
116 fdflags(fd
, O_NONBLOCK
, O_NONBLOCK
, FD_CLOEXEC
, FD_CLOEXEC
);
117 memset(&iff
, 0, sizeof(iff
));
119 iff
.ifr_flags
= IFF_TUN
| IFF_NO_PI
;
120 if ((f
= ioctl(fd
, TUNSETIFF
, &iff
)) < 0) {
121 a_warn("TUN", "-", "linux", "config-error", "?ERRNO", A_END
);
128 sel_initfile(&sel
, &t
->f
, fd
, SEL_READ
, t_read
, t
);
130 iff
.ifr_name
[IFNAMSIZ
- 1] = 0;
131 strcpy(t
->ifn
, iff
.ifr_name
);
132 T( trace(T_TUNNEL
, "tun-linux: attached interface %s to peer `%s'",
133 t
->ifn
, p_name(p
)); )
137 /* --- @t_ifname@ --- *
139 * Arguments: @tunnel *t@ = pointer to tunnel block
141 * Returns: A pointer to the tunnel's interface name.
144 static const char *t_ifname(tunnel
*t
) { return (t
->ifn
); }
146 /* --- @t_inject@ --- *
148 * Arguments: @tunnel *t@ = pointer to tunnel block
149 * @buf *b@ = buffer to send
153 * Use: Injects a packet into the local network stack.
156 static void t_inject(tunnel
*t
, buf
*b
)
158 IF_TRACING(T_TUNNEL
, {
159 trace(T_TUNNEL
, "tun-linux: inject decrypted packet");
160 trace_block(T_PACKET
, "tunnel: packet contents", BBASE(b
), BLEN(b
));
162 write(t
->f
.fd
, BBASE(b
), BLEN(b
));
165 /* --- @t_destroy@ --- *
167 * Arguments: @tunnel *t@ = pointer to tunnel block
171 * Use: Destroys a tunnel.
174 static void t_destroy(tunnel
*t
)
181 const tunnel_ops tun_linux
= {
192 /*----- That's all, folks -------------------------------------------------*/