2 device.c -- Interaction BSD tun/tap device
3 Copyright (C) 2001-2005 Ivo Timmermans,
4 2001-2009 Guus Sliepen <guus@tinc-vpn.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 along
17 with this program; if not, write to the Free Software Foundation, Inc.,
18 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
31 #include "bsd/tunemu.h"
34 #define DEFAULT_DEVICE "/dev/tun0"
36 typedef enum device_type {
38 DEVICE_TYPE_TUNIFHEAD,
48 static char *device_info = NULL;
49 static int device_total_in = 0;
50 static int device_total_out = 0;
52 static device_type_t device_type = DEVICE_TYPE_TUNEMU;
53 #elif defined(HAVE_OPENBSD) || defined(HAVE_FREEBSD)
54 static device_type_t device_type = DEVICE_TYPE_TUNIFHEAD;
56 static device_type_t device_type = DEVICE_TYPE_TUN;
59 bool setup_device(void) {
62 if(!get_config_string(lookup_config(config_tree, "Device"), &device))
63 device = xstrdup(DEFAULT_DEVICE);
65 if(!get_config_string(lookup_config(config_tree, "Interface"), &iface))
66 iface = xstrdup(rindex(device, '/') ? rindex(device, '/') + 1 : device);
68 if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
69 if(!strcasecmp(type, "tun"))
72 else if(!strcasecmp(type, "tunemu"))
73 device_type = DEVICE_TYPE_TUNEMU;
75 else if(!strcasecmp(type, "tunnohead"))
76 device_type = DEVICE_TYPE_TUN;
77 else if(!strcasecmp(type, "tunifhead"))
78 device_type = DEVICE_TYPE_TUNIFHEAD;
79 else if(!strcasecmp(type, "tap"))
80 device_type = DEVICE_TYPE_TAP;
82 logger(LOG_ERR, _("Unknown device type %s!"), type);
86 if(strstr(device, "tap") || routing_mode != RMODE_ROUTER)
87 device_type = DEVICE_TYPE_TAP;
92 case DEVICE_TYPE_TUNEMU: {
93 char dynamic_name[256] = "";
94 device_fd = tunemu_open(dynamic_name);
99 device_fd = open(device, O_RDWR | O_NONBLOCK);
103 logger(LOG_ERR, _("Could not open %s: %s"), device, strerror(errno));
107 switch(device_type) {
109 device_type = DEVICE_TYPE_TUN;
110 case DEVICE_TYPE_TUN:
114 if(ioctl(device_fd, TUNSIFHEAD, &zero, sizeof zero) == -1) {
115 logger(LOG_ERR, _("System call `%s' failed: %s"), "ioctl", strerror(errno));
120 #if defined(TUNSIFMODE) && defined(IFF_BROADCAST) && defined(IFF_MULTICAST)
122 const int mode = IFF_BROADCAST | IFF_MULTICAST;
123 ioctl(device_fd, TUNSIFMODE, &mode, sizeof mode);
127 device_info = _("Generic BSD tun device");
129 case DEVICE_TYPE_TUNIFHEAD:
133 if(ioctl(device_fd, TUNSIFHEAD, &one, sizeof one) == -1) {
134 logger(LOG_ERR, _("System call `%s' failed: %s"), "ioctl", strerror(errno));
139 #if defined(TUNSIFMODE) && defined(IFF_BROADCAST) && defined(IFF_MULTICAST)
141 const int mode = IFF_BROADCAST | IFF_MULTICAST;
142 ioctl(device_fd, TUNSIFMODE, &mode, sizeof mode);
146 device_info = _("Generic BSD tun device");
148 case DEVICE_TYPE_TAP:
149 if(routing_mode == RMODE_ROUTER)
150 overwrite_mac = true;
151 device_info = _("Generic BSD tap device");
154 case DEVICE_TYPE_TUNEMU:
155 device_info = _("BSD tunemu device");
160 logger(LOG_INFO, _("%s is a %s"), device, device_info);
165 void close_device(void) {
166 switch(device_type) {
168 case DEVICE_TYPE_TUNEMU:
169 tunemu_close(device_fd);
180 bool read_packet(vpn_packet_t *packet) {
183 switch(device_type) {
184 case DEVICE_TYPE_TUN:
186 case DEVICE_TYPE_TUNEMU:
187 if(device_type == DEVICE_TYPE_TUNEMU)
188 lenin = tunemu_read(device_fd, packet->data + 14, MTU - 14);
191 lenin = read(device_fd, packet->data + 14, MTU - 14);
195 logger(LOG_ERR, _("Error while reading from %s %s: %s"), device_info,
196 device, strerror(errno));
200 switch(packet->data[14] >> 4) {
202 packet->data[12] = 0x08;
203 packet->data[13] = 0x00;
206 packet->data[12] = 0x86;
207 packet->data[13] = 0xDD;
210 ifdebug(TRAFFIC) logger(LOG_ERR,
211 _ ("Unknown IP version %d while reading packet from %s %s"),
212 packet->data[14] >> 4, device_info, device);
216 packet->len = lenin + 14;
219 case DEVICE_TYPE_TUNIFHEAD: {
221 struct iovec vector[2] = {{&type, sizeof(type)}, {packet->data + 14, MTU - 14}};
223 if((lenin = readv(device_fd, vector, 2)) <= 0) {
224 logger(LOG_ERR, _("Error while reading from %s %s: %s"), device_info,
225 device, strerror(errno));
229 switch (ntohl(type)) {
231 packet->data[12] = 0x08;
232 packet->data[13] = 0x00;
236 packet->data[12] = 0x86;
237 packet->data[13] = 0xDD;
241 ifdebug(TRAFFIC) logger(LOG_ERR,
242 _ ("Unknown address family %x while reading packet from %s %s"),
243 ntohl(type), device_info, device);
247 packet->len = lenin + 10;
251 case DEVICE_TYPE_TAP:
252 if((lenin = read(device_fd, packet->data, MTU)) <= 0) {
253 logger(LOG_ERR, _("Error while reading from %s %s: %s"), device_info,
254 device, strerror(errno));
265 device_total_in += packet->len;
267 ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Read packet of %d bytes from %s"),
268 packet->len, device_info);
270 logger(LOG_INFO, "E:fd_read");
274 bool write_packet(vpn_packet_t *packet) {
275 ifdebug(TRAFFIC) logger(LOG_DEBUG, _("Writing packet of %d bytes to %s"),
276 packet->len, device_info);
278 switch(device_type) {
279 case DEVICE_TYPE_TUN:
280 if(write(device_fd, packet->data + 14, packet->len - 14) < 0) {
281 logger(LOG_ERR, _("Error while writing to %s %s: %s"), device_info,
282 device, strerror(errno));
287 case DEVICE_TYPE_TUNIFHEAD: {
289 struct iovec vector[2] = {{&type, sizeof(type)}, {packet->data + 14, packet->len - 14}};
292 af = (packet->data[12] << 8) + packet->data[13];
296 type = htonl(AF_INET);
299 type = htonl(AF_INET6);
302 ifdebug(TRAFFIC) logger(LOG_ERR,
303 _("Unknown address family %x while writing packet to %s %s"),
304 af, device_info, device);
308 if(writev(device_fd, vector, 2) < 0) {
309 logger(LOG_ERR, _("Can't write to %s %s: %s"), device_info, device,
316 case DEVICE_TYPE_TAP:
317 if(write(device_fd, packet->data, packet->len) < 0) {
318 logger(LOG_ERR, _("Error while writing to %s %s: %s"), device_info,
319 device, strerror(errno));
325 case DEVICE_TYPE_TUNEMU:
326 if(tunemu_write(device_fd, packet->data + 14, packet->len - 14) < 0) {
327 logger(LOG_ERR, _("Error while writing to %s %s: %s"), device_info,
328 device, strerror(errno));
338 device_total_out += packet->len;
343 void dump_device_stats(void) {
344 logger(LOG_DEBUG, _("Statistics for %s %s:"), device_info, device);
345 logger(LOG_DEBUG, _(" total bytes in: %10d"), device_total_in);
346 logger(LOG_DEBUG, _(" total bytes out: %10d"), device_total_out);