3 * Tunnel interface based on Linux Usernet
5 * (c) 2001 Straylight/Edgeware
8 /*----- Licensing notice --------------------------------------------------*
10 * This file is part of Trivial IP Encryption (TrIPE).
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.
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.
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.
27 /*----- Header files ------------------------------------------------------*/
34 # include <sys/ioctl.h>
35 # include <linux/if.h>
39 /*----- Main code ---------------------------------------------------------*/
44 const tunnel_ops
*ops
; /* Pointer to operations */
45 sel_file f
; /* Selector for Usernet device */
46 struct peer
*p
; /* Pointer to my peer */
51 * Arguments: @int fd@ = file descriptor to read
52 * @unsigned mode@ = what's happened
53 * @void *v@ = pointer to tunnel block
57 * Use: Reads data from the tunnel.
60 static void t_read(int fd
, unsigned mode
, void *v
)
66 n
= read(fd
, buf_i
, sizeof(buf_i
));
68 a_warn("TUN", "%s", p_ifname(t
->p
), "unet",
69 "read-error", "?ERRNO", A_END
);
72 IF_TRACING(T_TUNNEL
, {
73 trace(T_TUNNEL
, "tun-unet: packet arrived");
74 trace_block(T_PACKET
, "tun-unet: packet contents", buf_i
, n
);
76 buf_init(&b
, buf_i
, n
);
86 * Use: Initializes the tunneling system. Maybe this will require
87 * opening file descriptors or something.
90 static void t_init(void) { return; }
92 /* --- @t_create@ --- *
94 * Arguments: @peer *p@ = pointer to peer block
95 * @int fd@ = file descriptor of tunnel device
96 * @char **ifn@ = where to put the interface name
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
, int fd
, char **ifn
)
107 fdflags(fd
, O_NONBLOCK
, O_NONBLOCK
, FD_CLOEXEC
, FD_CLOEXEC
);
111 sel_initfile(&sel
, &t
->f
, fd
, SEL_READ
, t_read
, t
);
116 /* --- @t_inject@ --- *
118 * Arguments: @tunnel *t@ = pointer to tunnel block
119 * @buf *b@ = buffer to send
123 * Use: Injects a packet into the local network stack.
126 static void t_inject(tunnel
*t
, buf
*b
)
128 IF_TRACING(T_TUNNEL
, {
129 trace(T_TUNNEL
, "tun-unet: inject decrypted packet");
130 trace_block(T_PACKET
, "tun-unet: packet contents", BBASE(b
), BLEN(b
));
132 IGNORE(write(t
->f
.fd
, BBASE(b
), BLEN(b
)));
135 /* --- @t_destroy@ --- *
137 * Arguments: @tunnel *t@ = pointer to tunnel block
141 * Use: Destroys a tunnel.
144 static void t_destroy(tunnel
*t
)
145 { sel_rmfile(&t
->f
); close(t
->f
.fd
); DESTROY(t
); }
147 const tunnel_ops tun_unet
= {
159 /*----- That's all, folks -------------------------------------------------*/