2 device.c -- Interaction with OpenBSD tun device
3 Copyright (C) 2001-2003 Ivo Timmermans <ivo@o2w.nl>,
4 2001-2003 Guus Sliepen <guus@sliepen.eu.org>
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 $Id: device.c,v 1.1.2.15 2003/07/12 17:41:48 guus Exp $
27 #include <sys/types.h>
30 #include <sys/ioctl.h>
31 #include <sys/socket.h>
44 #define DEFAULT_DEVICE "/dev/tun0"
46 #define DEVICE_TYPE_ETHERTAP 0
47 #define DEVICE_TYPE_TUNTAP 1
55 int device_total_in = 0;
56 int device_total_out = 0;
58 int setup_device(void)
62 if(!get_config_string(lookup_config(config_tree, "Device"), &device))
63 device = DEFAULT_DEVICE;
65 if(!get_config_string(lookup_config(config_tree, "Interface"), &interface))
66 interface = rindex(device, '/') ? rindex(device, '/') + 1 : device;
67 if((device_fd = open(device, O_RDWR | O_NONBLOCK)) < 0) {
68 logger(LOG_ERR, _("Could not open %s: %s"), device, strerror(errno));
72 device_info = _("OpenBSD tun device");
74 logger(LOG_INFO, _("%s is a %s"), device, device_info);
79 void close_device(void)
86 int read_packet(vpn_packet_t *packet)
90 struct iovec vector[2] = {{&type, sizeof(type)}, {packet->data + 14, MTU - 14}};
94 if((lenin = readv(device_fd, vector, 2)) <= 0) {
95 logger(LOG_ERR, _("Error while reading from %s %s: %s"), device_info,
96 device, strerror(errno));
100 switch (ntohl(type)) {
102 packet->data[12] = 0x8;
103 packet->data[13] = 0x0;
107 packet->data[12] = 0x86;
108 packet->data[13] = 0xDD;
112 ifdebug(TRAFFIC) logger(LOG_ERR,
113 _ ("Unknown address family %d while reading packet from %s %s"),
114 ntohl(type), device_info, device);
118 packet->len = lenin + 10;
120 device_total_in += packet->len;
122 ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Read packet of %d bytes from %s"), packet->len,
129 int write_packet(vpn_packet_t *packet)
132 struct iovec vector[2];
137 ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Writing packet of %d bytes to %s"),
138 packet->len, device_info);
140 af = (packet->data[12] << 8) + packet->data[13];
144 type = htonl(AF_INET);
147 type = htonl(AF_INET6);
150 ifdebug(TRAFFIC) logger(LOG_ERR,
151 _("Unknown address family %d while writing packet to %s %s"),
152 af, device_info, device);
156 vector[0].iov_base = &type;
157 vector[0].iov_len = sizeof(type);
158 vector[1].iov_base = packet->data + 14;
159 vector[1].iov_len = packet->len - 14;
161 if(writev(device_fd, vector, 2) < 0) {
162 logger(LOG_ERR, _("Can't write to %s %s: %s"), device_info, device,
167 device_total_out += packet->len;
170 void dump_device_stats(void)
174 logger(LOG_DEBUG, _("Statistics for %s %s:"), device_info, device);
175 logger(LOG_DEBUG, _(" total bytes in: %10d"), device_total_in);
176 logger(LOG_DEBUG, _(" total bytes out: %10d"), device_total_out);