2 device.c -- Interaction with OpenBSD tun device
3 Copyright (C) 2001-2002 Ivo Timmermans <itimmermans@bigfoot.com>,
4 2001-2002 Guus Sliepen <guus@sliepen.warande.net>
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 1.1.2.4 2002/02/11 12:33:01 guus Exp $
26 #include <sys/types.h>
29 #include <sys/ioctl.h>
30 #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 extern subnet_t mymac;
61 open the local ethertap device
63 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;
71 if((device_fd = open(device, O_RDWR | O_NONBLOCK)) < 0)
73 syslog(LOG_ERR, _("Could not open %s: %m"), device);
77 /* 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}};
108 if((lenin = readv(device_fd, vector, 2)) <= 0)
110 syslog(LOG_ERR, _("Error while reading from %s %s: %m"), device_info, device);
114 memcpy(packet->data, mymac.net.mac.address.x, 6);
115 memcpy(packet->data + 6, mymac.net.mac.address.x, 6);
116 packet->data[12] = 0x08;
117 packet->data[13] = 0x00;
119 packet->len = lenin + 10;
121 device_total_in += packet->len;
123 if(debug_lvl >= DEBUG_TRAFFIC)
125 syslog(LOG_DEBUG, _("Read packet of %d bytes from %s"), packet->len, device_info);
132 int write_packet(vpn_packet_t *packet)
134 u_int32_t type = htonl(AF_INET);
135 struct iovec vector[2];
137 if(debug_lvl >= DEBUG_TRAFFIC)
138 syslog(LOG_DEBUG, _("Writing packet of %d bytes to %s"),
139 packet->len, device_info);
141 vector[0].iov_base = &type;
142 vector[0].iov_len = sizeof(type);
143 vector[1].iov_base = packet->data + 14;
144 vector[1].iov_len = packet->len - 14;
146 if(writev(device_fd, vector, 2) < 0)
148 syslog(LOG_ERR, _("Can't write to %s %s: %m"), device_info, device);
152 device_total_out += packet->len;
156 void dump_device_stats(void)
159 syslog(LOG_DEBUG, _("Statistics for %s %s:"), device_info, device);
160 syslog(LOG_DEBUG, _(" total bytes in: %10d"), device_total_in);
161 syslog(LOG_DEBUG, _(" total bytes out: %10d"), device_total_out);