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 1.1.2.13 2003/06/11 19:28:37 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;
60 open the local ethertap device
62 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 if((device_fd = open(device, O_RDWR | O_NONBLOCK)) < 0) {
72 syslog(LOG_ERR, _("Could not open %s: %s"), device, strerror(errno));
76 device_info = _("OpenBSD tun device");
78 syslog(LOG_INFO, _("%s is a %s"), device, device_info);
83 void close_device(void)
90 int read_packet(vpn_packet_t *packet)
94 struct iovec vector[2] = {{&type, sizeof(type)}, {packet->data + 14, MTU - 14}};
98 if((lenin = readv(device_fd, vector, 2)) <= 0) {
99 syslog(LOG_ERR, _("Error while reading from %s %s: %s"), device_info,
100 device, strerror(errno));
104 switch (ntohl(type)) {
106 packet->data[12] = 0x8;
107 packet->data[13] = 0x0;
111 packet->data[12] = 0x86;
112 packet->data[13] = 0xDD;
116 if(debug_lvl >= DEBUG_TRAFFIC)
119 ("Unknown address family %d while reading packet from %s %s"),
120 ntohl(type), device_info, device);
124 packet->len = lenin + 10;
126 device_total_in += packet->len;
128 if(debug_lvl >= DEBUG_TRAFFIC) {
129 syslog(LOG_DEBUG, _("Read packet of %d bytes from %s"), packet->len,
136 int write_packet(vpn_packet_t *packet)
139 struct iovec vector[2];
144 if(debug_lvl >= DEBUG_TRAFFIC)
145 syslog(LOG_DEBUG, _("Writing packet of %d bytes to %s"),
146 packet->len, device_info);
148 af = (packet->data[12] << 8) + packet->data[13];
152 type = htonl(AF_INET);
155 type = htonl(AF_INET6);
158 if(debug_lvl >= DEBUG_TRAFFIC)
160 _("Unknown address family %d while writing packet to %s %s"),
161 af, device_info, device);
165 vector[0].iov_base = &type;
166 vector[0].iov_len = sizeof(type);
167 vector[1].iov_base = packet->data + 14;
168 vector[1].iov_len = packet->len - 14;
170 if(writev(device_fd, vector, 2) < 0) {
171 syslog(LOG_ERR, _("Can't write to %s %s: %s"), device_info, device,
176 device_total_out += packet->len;
179 void dump_device_stats(void)
183 syslog(LOG_DEBUG, _("Statistics for %s %s:"), device_info, device);
184 syslog(LOG_DEBUG, _(" total bytes in: %10d"), device_total_in);
185 syslog(LOG_DEBUG, _(" total bytes out: %10d"), device_total_out);