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 1.1.2.14 2003/07/06 22:11:37 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;
59 open the local ethertap device
61 int setup_device(void)
65 if(!get_config_string(lookup_config(config_tree, "Device"), &device))
66 device = DEFAULT_DEVICE;
68 if(!get_config_string(lookup_config(config_tree, "Interface"), &interface))
69 interface = rindex(device, '/') ? rindex(device, '/') + 1 : device;
70 if((device_fd = open(device, O_RDWR | O_NONBLOCK)) < 0) {
71 logger(DEBUG_ALWAYS, LOG_ERR, _("Could not open %s: %s"), device, strerror(errno));
75 device_info = _("OpenBSD tun device");
77 logger(DEBUG_ALWAYS, LOG_INFO, _("%s is a %s"), device, device_info);
82 void close_device(void)
89 int read_packet(vpn_packet_t *packet)
93 struct iovec vector[2] = {{&type, sizeof(type)}, {packet->data + 14, MTU - 14}};
97 if((lenin = readv(device_fd, vector, 2)) <= 0) {
98 logger(DEBUG_ALWAYS, LOG_ERR, _("Error while reading from %s %s: %s"), device_info,
99 device, strerror(errno));
103 switch (ntohl(type)) {
105 packet->data[12] = 0x8;
106 packet->data[13] = 0x0;
110 packet->data[12] = 0x86;
111 packet->data[13] = 0xDD;
115 logger(DEBUG_TRAFFIC, LOG_ERR,
116 _ ("Unknown address family %d while reading packet from %s %s"),
117 ntohl(type), device_info, device);
121 packet->len = lenin + 10;
123 device_total_in += packet->len;
125 logger(DEBUG_TRAFFIC, LOG_DEBUG, _("Read packet of %d bytes from %s"), packet->len,
132 int write_packet(vpn_packet_t *packet)
135 struct iovec vector[2];
140 logger(DEBUG_TRAFFIC, LOG_DEBUG, _("Writing packet of %d bytes to %s"),
141 packet->len, device_info);
143 af = (packet->data[12] << 8) + packet->data[13];
147 type = htonl(AF_INET);
150 type = htonl(AF_INET6);
153 logger(DEBUG_TRAFFIC, LOG_ERR,
154 _("Unknown address family %d while writing packet to %s %s"),
155 af, device_info, device);
159 vector[0].iov_base = &type;
160 vector[0].iov_len = sizeof(type);
161 vector[1].iov_base = packet->data + 14;
162 vector[1].iov_len = packet->len - 14;
164 if(writev(device_fd, vector, 2) < 0) {
165 logger(DEBUG_ALWAYS, LOG_ERR, _("Can't write to %s %s: %s"), device_info, device,
170 device_total_out += packet->len;
173 void dump_device_stats(void)
177 logger(DEBUG_ALWAYS, LOG_DEBUG, _("Statistics for %s %s:"), device_info, device);
178 logger(DEBUG_ALWAYS, LOG_DEBUG, _(" total bytes in: %10d"), device_total_in);
179 logger(DEBUG_ALWAYS, LOG_DEBUG, _(" total bytes out: %10d"), device_total_out);