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 1.1.2.10 2002/09/09 21:25:26 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)
66 if(!get_config_string(lookup_config(config_tree, "Device"), &device))
67 device = DEFAULT_DEVICE;
69 if(!get_config_string(lookup_config(config_tree, "Interface"), &interface))
70 interface = rindex(device, '/') ? rindex(device, '/') + 1 : device;
71 cp if((device_fd = open(device, O_RDWR | O_NONBLOCK)) < 0) {
72 syslog(LOG_ERR, _("Could not open %s: %s"), device, strerror(errno));
76 /* Set default MAC address for ethertap devices */
77 mymac.type = SUBNET_MAC;
78 mymac.net.mac.address.x[0] = 0xfe;
79 mymac.net.mac.address.x[1] = 0xfd;
80 mymac.net.mac.address.x[2] = 0x00;
81 mymac.net.mac.address.x[3] = 0x00;
82 mymac.net.mac.address.x[4] = 0x00;
83 mymac.net.mac.address.x[5] = 0x00;
85 device_info = _("OpenBSD tun device");
87 syslog(LOG_INFO, _("%s is a %s"), device, device_info);
91 void close_device(void)
96 int read_packet(vpn_packet_t * packet)
100 struct iovec vector[2] = { {&type, sizeof(type)}
101 , {packet->data + 14, MTU - 14}
103 cp if((lenin = readv(device_fd, vector, 2)) <= 0) {
104 syslog(LOG_ERR, _("Error while reading from %s %s: %s"), device_info,
105 device, strerror(errno));
109 memcpy(packet->data, mymac.net.mac.address.x, 6);
110 memcpy(packet->data + 6, mymac.net.mac.address.x, 6);
112 switch (ntohl(type)) {
114 packet->data[12] = 0x8;
115 packet->data[13] = 0x0;
118 packet->data[12] = 0x86;
119 packet->data[13] = 0xDD;
122 if(debug_lvl >= DEBUG_TRAFFIC)
125 ("Unknown address family %d while reading packet from %s %s"),
126 ntohl(type), device_info, device);
130 packet->len = lenin + 10;
132 device_total_in += packet->len;
134 if(debug_lvl >= DEBUG_TRAFFIC) {
135 syslog(LOG_DEBUG, _("Read packet of %d bytes from %s"), packet->len,
142 int write_packet(vpn_packet_t * packet)
145 struct iovec vector[2];
147 cp if(debug_lvl >= DEBUG_TRAFFIC)
148 syslog(LOG_DEBUG, _("Writing packet of %d bytes to %s"),
149 packet->len, device_info);
151 af = (packet->data[12] << 8) + packet->data[13];
155 type = htonl(AF_INET);
158 type = htonl(AF_INET6);
161 if(debug_lvl >= DEBUG_TRAFFIC)
163 _("Unknown address family %d while writing packet to %s %s"),
164 af, device_info, device);
168 vector[0].iov_base = &type;
169 vector[0].iov_len = sizeof(type);
170 vector[1].iov_base = packet->data + 14;
171 vector[1].iov_len = packet->len - 14;
173 if(writev(device_fd, vector, 2) < 0) {
174 syslog(LOG_ERR, _("Can't write to %s %s: %s"), device_info, device,
179 device_total_out += packet->len;
182 void dump_device_stats(void)
184 cp syslog(LOG_DEBUG, _("Statistics for %s %s:"), device_info, device);
185 syslog(LOG_DEBUG, _(" total bytes in: %10d"), device_total_in);
186 syslog(LOG_DEBUG, _(" total bytes out: %10d"), device_total_out);