2 device.c -- Interaction BSD tun/tap device
3 Copyright (C) 2001-2005 Ivo Timmermans,
4 2001-2012 Guus Sliepen <guus@tinc-vpn.org>
5 2009 Grzegorz Dymarek <gregd72002@googlemail.com>
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License along
18 with this program; if not, write to the Free Software Foundation, Inc.,
19 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
33 #include "bsd/tunemu.h"
36 #define DEFAULT_DEVICE "/dev/tun0"
38 typedef enum device_type {
40 DEVICE_TYPE_TUNIFHEAD,
50 static char *device_info = NULL;
51 static uint64_t device_total_in = 0;
52 static uint64_t device_total_out = 0;
54 static device_type_t device_type = DEVICE_TYPE_TUNEMU;
55 #elif defined(HAVE_OPENBSD) || defined(HAVE_FREEBSD) || defined(HAVE_DRAGONFLY)
56 static device_type_t device_type = DEVICE_TYPE_TUNIFHEAD;
58 static device_type_t device_type = DEVICE_TYPE_TUN;
61 static bool setup_device(void) {
64 if(!get_config_string(lookup_config(config_tree, "Device"), &device))
65 device = xstrdup(DEFAULT_DEVICE);
67 if(!get_config_string(lookup_config(config_tree, "Interface"), &iface))
68 iface = xstrdup(strrchr(device, '/') ? strrchr(device, '/') + 1 : device);
70 if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
71 if(!strcasecmp(type, "tun"))
74 else if(!strcasecmp(type, "tunemu"))
75 device_type = DEVICE_TYPE_TUNEMU;
77 else if(!strcasecmp(type, "tunnohead"))
78 device_type = DEVICE_TYPE_TUN;
79 else if(!strcasecmp(type, "tunifhead"))
80 device_type = DEVICE_TYPE_TUNIFHEAD;
81 else if(!strcasecmp(type, "tap"))
82 device_type = DEVICE_TYPE_TAP;
84 logger(LOG_ERR, "Unknown device type %s!", type);
88 if(strstr(device, "tap") || routing_mode != RMODE_ROUTER)
89 device_type = DEVICE_TYPE_TAP;
94 case DEVICE_TYPE_TUNEMU: {
95 char dynamic_name[256] = "";
96 device_fd = tunemu_open(dynamic_name);
101 device_fd = open(device, O_RDWR | O_NONBLOCK);
105 logger(LOG_ERR, "Could not open %s: %s", device, strerror(errno));
110 fcntl(device_fd, F_SETFD, FD_CLOEXEC);
113 switch(device_type) {
115 device_type = DEVICE_TYPE_TUN;
116 case DEVICE_TYPE_TUN:
120 if(ioctl(device_fd, TUNSIFHEAD, &zero, sizeof zero) == -1) {
121 logger(LOG_ERR, "System call `%s' failed: %s", "ioctl", strerror(errno));
126 #if defined(TUNSIFMODE) && defined(IFF_BROADCAST) && defined(IFF_MULTICAST)
128 const int mode = IFF_BROADCAST | IFF_MULTICAST;
129 ioctl(device_fd, TUNSIFMODE, &mode, sizeof mode);
133 device_info = "Generic BSD tun device";
135 case DEVICE_TYPE_TUNIFHEAD:
139 if(ioctl(device_fd, TUNSIFHEAD, &one, sizeof one) == -1) {
140 logger(LOG_ERR, "System call `%s' failed: %s", "ioctl", strerror(errno));
145 #if defined(TUNSIFMODE) && defined(IFF_BROADCAST) && defined(IFF_MULTICAST)
147 const int mode = IFF_BROADCAST | IFF_MULTICAST;
148 ioctl(device_fd, TUNSIFMODE, &mode, sizeof mode);
152 device_info = "Generic BSD tun device";
154 case DEVICE_TYPE_TAP:
155 if(routing_mode == RMODE_ROUTER)
156 overwrite_mac = true;
157 device_info = "Generic BSD tap device";
161 if(ioctl(device_fd, TAPGIFNAME, (void*)&ifr) == 0) {
164 iface = xstrdup(ifr.ifr_name);
171 case DEVICE_TYPE_TUNEMU:
172 device_info = "BSD tunemu device";
177 logger(LOG_INFO, "%s is a %s", device, device_info);
182 static void close_device(void) {
183 switch(device_type) {
185 case DEVICE_TYPE_TUNEMU:
186 tunemu_close(device_fd);
197 static bool read_packet(vpn_packet_t *packet) {
200 switch(device_type) {
201 case DEVICE_TYPE_TUN:
203 case DEVICE_TYPE_TUNEMU:
204 if(device_type == DEVICE_TYPE_TUNEMU)
205 inlen = tunemu_read(device_fd, packet->data + 14, MTU - 14);
208 inlen = read(device_fd, packet->data + 14, MTU - 14);
211 logger(LOG_ERR, "Error while reading from %s %s: %s", device_info,
212 device, strerror(errno));
216 switch(packet->data[14] >> 4) {
218 packet->data[12] = 0x08;
219 packet->data[13] = 0x00;
222 packet->data[12] = 0x86;
223 packet->data[13] = 0xDD;
226 ifdebug(TRAFFIC) logger(LOG_ERR,
227 "Unknown IP version %d while reading packet from %s %s",
228 packet->data[14] >> 4, device_info, device);
232 packet->len = inlen + 14;
235 case DEVICE_TYPE_TUNIFHEAD: {
237 struct iovec vector[2] = {{&type, sizeof type}, {packet->data + 14, MTU - 14}};
239 if((inlen = readv(device_fd, vector, 2)) <= 0) {
240 logger(LOG_ERR, "Error while reading from %s %s: %s", device_info,
241 device, strerror(errno));
245 switch (ntohl(type)) {
247 packet->data[12] = 0x08;
248 packet->data[13] = 0x00;
252 packet->data[12] = 0x86;
253 packet->data[13] = 0xDD;
257 ifdebug(TRAFFIC) logger(LOG_ERR,
258 "Unknown address family %x while reading packet from %s %s",
259 ntohl(type), device_info, device);
263 packet->len = inlen + 10;
267 case DEVICE_TYPE_TAP:
268 if((inlen = read(device_fd, packet->data, MTU)) <= 0) {
269 logger(LOG_ERR, "Error while reading from %s %s: %s", device_info,
270 device, strerror(errno));
281 device_total_in += packet->len;
283 ifdebug(TRAFFIC) logger(LOG_DEBUG, "Read packet of %d bytes from %s",
284 packet->len, device_info);
289 static bool write_packet(vpn_packet_t *packet) {
290 ifdebug(TRAFFIC) logger(LOG_DEBUG, "Writing packet of %d bytes to %s",
291 packet->len, device_info);
293 switch(device_type) {
294 case DEVICE_TYPE_TUN:
295 if(write(device_fd, packet->data + 14, packet->len - 14) < 0) {
296 logger(LOG_ERR, "Error while writing to %s %s: %s", device_info,
297 device, strerror(errno));
302 case DEVICE_TYPE_TUNIFHEAD: {
304 struct iovec vector[2] = {{&type, sizeof type}, {packet->data + 14, packet->len - 14}};
307 af = (packet->data[12] << 8) + packet->data[13];
311 type = htonl(AF_INET);
314 type = htonl(AF_INET6);
317 ifdebug(TRAFFIC) logger(LOG_ERR,
318 "Unknown address family %x while writing packet to %s %s",
319 af, device_info, device);
323 if(writev(device_fd, vector, 2) < 0) {
324 logger(LOG_ERR, "Can't write to %s %s: %s", device_info, device,
331 case DEVICE_TYPE_TAP:
332 if(write(device_fd, packet->data, packet->len) < 0) {
333 logger(LOG_ERR, "Error while writing to %s %s: %s", device_info,
334 device, strerror(errno));
340 case DEVICE_TYPE_TUNEMU:
341 if(tunemu_write(device_fd, packet->data + 14, packet->len - 14) < 0) {
342 logger(LOG_ERR, "Error while writing to %s %s: %s", device_info,
343 device, strerror(errno));
353 device_total_out += packet->len;
358 static void dump_device_stats(void) {
359 logger(LOG_DEBUG, "Statistics for %s %s:", device_info, device);
360 logger(LOG_DEBUG, " total bytes in: %10"PRIu64, device_total_in);
361 logger(LOG_DEBUG, " total bytes out: %10"PRIu64, device_total_out);
364 const devops_t os_devops = {
365 .setup = setup_device,
366 .close = close_device,
368 .write = write_packet,
369 .dump_stats = dump_device_stats,