2 device.c -- Interaction with OpenBSD tun device
3 Copyright (C) 2001-2002 Ivo Timmermans <ivo@o2w.nl>,
4 2001-2002 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 1.1.2.12 2002/09/10 21:29:42 guus Exp $
27 #include <sys/types.h>
30 #include <sys/ioctl.h>
31 #include <sys/socket.h>
45 #define DEFAULT_DEVICE "/dev/tun0"
47 #define DEVICE_TYPE_ETHERTAP 0
48 #define DEVICE_TYPE_TUNTAP 1
56 int device_total_in = 0;
57 int device_total_out = 0;
59 extern subnet_t mymac;
62 open the local ethertap device
64 int setup_device(void)
68 if(!get_config_string(lookup_config(config_tree, "Device"), &device))
69 device = DEFAULT_DEVICE;
71 if(!get_config_string(lookup_config(config_tree, "Interface"), &interface))
72 interface = rindex(device, '/') ? rindex(device, '/') + 1 : device;
73 if((device_fd = open(device, O_RDWR | O_NONBLOCK)) < 0) {
74 syslog(LOG_ERR, _("Could not open %s: %s"), device, strerror(errno));
78 /* Set default MAC address for ethertap devices */
79 mymac.type = SUBNET_MAC;
80 mymac.net.mac.address.x[0] = 0xfe;
81 mymac.net.mac.address.x[1] = 0xfd;
82 mymac.net.mac.address.x[2] = 0x00;
83 mymac.net.mac.address.x[3] = 0x00;
84 mymac.net.mac.address.x[4] = 0x00;
85 mymac.net.mac.address.x[5] = 0x00;
87 device_info = _("OpenBSD tun device");
89 syslog(LOG_INFO, _("%s is a %s"), device, device_info);
94 void close_device(void)
101 int read_packet(vpn_packet_t *packet)
105 struct iovec vector[2] = {{&type, sizeof(type)}, {packet->data + 14, MTU - 14}};
109 if((lenin = readv(device_fd, vector, 2)) <= 0) {
110 syslog(LOG_ERR, _("Error while reading from %s %s: %s"), device_info,
111 device, strerror(errno));
115 memcpy(packet->data, mymac.net.mac.address.x, 6);
116 memcpy(packet->data + 6, mymac.net.mac.address.x, 6);
118 switch (ntohl(type)) {
120 packet->data[12] = 0x8;
121 packet->data[13] = 0x0;
125 packet->data[12] = 0x86;
126 packet->data[13] = 0xDD;
130 if(debug_lvl >= DEBUG_TRAFFIC)
133 ("Unknown address family %d while reading packet from %s %s"),
134 ntohl(type), device_info, device);
138 packet->len = lenin + 10;
140 device_total_in += packet->len;
142 if(debug_lvl >= DEBUG_TRAFFIC) {
143 syslog(LOG_DEBUG, _("Read packet of %d bytes from %s"), packet->len,
150 int write_packet(vpn_packet_t *packet)
153 struct iovec vector[2];
158 if(debug_lvl >= DEBUG_TRAFFIC)
159 syslog(LOG_DEBUG, _("Writing packet of %d bytes to %s"),
160 packet->len, device_info);
162 af = (packet->data[12] << 8) + packet->data[13];
166 type = htonl(AF_INET);
169 type = htonl(AF_INET6);
172 if(debug_lvl >= DEBUG_TRAFFIC)
174 _("Unknown address family %d while writing packet to %s %s"),
175 af, device_info, device);
179 vector[0].iov_base = &type;
180 vector[0].iov_len = sizeof(type);
181 vector[1].iov_base = packet->data + 14;
182 vector[1].iov_len = packet->len - 14;
184 if(writev(device_fd, vector, 2) < 0) {
185 syslog(LOG_ERR, _("Can't write to %s %s: %s"), device_info, device,
190 device_total_out += packet->len;
193 void dump_device_stats(void)
197 syslog(LOG_DEBUG, _("Statistics for %s %s:"), device_info, device);
198 syslog(LOG_DEBUG, _(" total bytes in: %10d"), device_total_in);
199 syslog(LOG_DEBUG, _(" total bytes out: %10d"), device_total_out);