2 device.c -- Interaction with FreeBSD tap 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 1.1.2.3 2002/02/11 12:33:01 guus Exp $
26 #include <sys/types.h>
28 #include <sys/ioctl.h>
29 #include <sys/socket.h>
43 #define DEFAULT_DEVICE "/dev/tap0"
50 int device_total_in = 0;
51 int device_total_out = 0;
53 extern subnet_t mymac;
56 open the local ethertap device
58 int setup_device(void)
61 if(!get_config_string(lookup_config(config_tree, "Device"), &device))
62 device = DEFAULT_DEVICE;
64 if(!get_config_string(lookup_config(config_tree, "Interface"), &interface))
65 interface = rindex(device, '/')?rindex(device, '/')+1:device;
67 if((device_fd = open(device, O_RDWR | O_NONBLOCK)) < 0)
69 syslog(LOG_ERR, _("Could not open %s: %m"), device);
74 /* Set default MAC address for ethertap devices */
76 mymac.type = SUBNET_MAC;
77 mymac.net.mac.address.x[0] = 0xfe;
78 mymac.net.mac.address.x[1] = 0xfd;
79 mymac.net.mac.address.x[2] = 0x00;
80 mymac.net.mac.address.x[3] = 0x00;
81 mymac.net.mac.address.x[4] = 0x00;
82 mymac.net.mac.address.x[5] = 0x00;
84 device_info = _("FreeBSD tap device");
86 syslog(LOG_INFO, _("%s is a %s"), device, device_info);
91 void close_device(void)
98 read, encrypt and send data that is
99 available through the ethertap device
101 int read_packet(vpn_packet_t *packet)
105 if((lenin = read(device_fd, packet->data, MTU)) <= 0)
107 syslog(LOG_ERR, _("Error while reading from %s %s: %m"), device_info, device);
113 device_total_in += packet->len;
115 if(debug_lvl >= DEBUG_TRAFFIC)
116 syslog(LOG_DEBUG, _("Read packet of %d bytes from %s"),
117 packet->len, device_info);
123 int write_packet(vpn_packet_t *packet)
126 if(debug_lvl >= DEBUG_TRAFFIC)
127 syslog(LOG_DEBUG, _("Writing packet of %d bytes to %s"),
128 packet->len, device_info);
130 if(write(device_fd, packet->data, packet->len) < 0)
132 syslog(LOG_ERR, _("Error while writing to %s %s: %m"), device_info, device);
136 device_total_out += packet->len;
140 void dump_device_stats(void)
143 syslog(LOG_DEBUG, _("Statistics for %s %s:"), device_info, device);
144 syslog(LOG_DEBUG, _(" total bytes in: %10d"), device_total_in);
145 syslog(LOG_DEBUG, _(" total bytes out: %10d"), device_total_out);