2 device.c -- Interaction BSD tun/tap device
3 Copyright (C) 2001-2005 Ivo Timmermans,
4 2001-2016 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.
22 #include "../system.h"
25 #include "../device.h"
26 #include "../logger.h"
30 #include "../xalloc.h"
36 #define DEFAULT_TUN_DEVICE "/dev/tun0"
37 #if defined(HAVE_FREEBSD) || defined(HAVE_NETBSD) || defined(HAVE_DARWIN)
38 #define DEFAULT_TAP_DEVICE "/dev/tap0"
40 #define DEFAULT_TAP_DEVICE "/dev/tun0"
43 typedef enum device_type {
45 DEVICE_TYPE_TUNIFHEAD,
55 static char *device_info = NULL;
56 static uint64_t device_total_in = 0;
57 static uint64_t device_total_out = 0;
58 #if defined(ENABLE_TUNEMU)
59 static device_type_t device_type = DEVICE_TYPE_TUNEMU;
60 #elif defined(HAVE_OPENBSD) || defined(HAVE_FREEBSD) || defined(HAVE_DRAGONFLY)
61 static device_type_t device_type = DEVICE_TYPE_TUNIFHEAD;
63 static device_type_t device_type = DEVICE_TYPE_TUN;
66 static bool setup_device(void) {
69 if(!get_config_string(lookup_config(config_tree, "Device"), &device)) {
70 if(routing_mode == RMODE_ROUTER)
71 device = xstrdup(DEFAULT_TUN_DEVICE);
73 device = xstrdup(DEFAULT_TAP_DEVICE);
76 if(!get_config_string(lookup_config(config_tree, "Interface"), &iface))
77 iface = xstrdup(strrchr(device, '/') ? strrchr(device, '/') + 1 : device);
78 else if(strcmp(iface, strrchr(device, '/') ? strrchr(device, '/') + 1 : device))
79 logger(LOG_WARNING, "Warning: Interface does not match Device. $INTERFACE might be set incorrectly.");
81 if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
82 if(!strcasecmp(type, "tun"))
85 else if(!strcasecmp(type, "tunemu"))
86 device_type = DEVICE_TYPE_TUNEMU;
88 else if(!strcasecmp(type, "tunnohead"))
89 device_type = DEVICE_TYPE_TUN;
90 else if(!strcasecmp(type, "tunifhead"))
91 device_type = DEVICE_TYPE_TUNIFHEAD;
92 else if(!strcasecmp(type, "tap"))
93 device_type = DEVICE_TYPE_TAP;
95 logger(LOG_ERR, "Unknown device type %s!", type);
99 if(strstr(device, "tap") || routing_mode != RMODE_ROUTER)
100 device_type = DEVICE_TYPE_TAP;
103 switch(device_type) {
105 case DEVICE_TYPE_TUNEMU: {
106 char dynamic_name[256] = "";
107 device_fd = tunemu_open(dynamic_name);
112 device_fd = open(device, O_RDWR | O_NONBLOCK);
116 logger(LOG_ERR, "Could not open %s: %s", device, strerror(errno));
121 fcntl(device_fd, F_SETFD, FD_CLOEXEC);
124 switch(device_type) {
126 device_type = DEVICE_TYPE_TUN;
127 case DEVICE_TYPE_TUN:
131 if(ioctl(device_fd, TUNSIFHEAD, &zero, sizeof zero) == -1) {
132 logger(LOG_ERR, "System call `%s' failed: %s", "ioctl", strerror(errno));
137 #if defined(TUNSIFMODE) && defined(IFF_BROADCAST) && defined(IFF_MULTICAST)
139 const int mode = IFF_BROADCAST | IFF_MULTICAST;
140 ioctl(device_fd, TUNSIFMODE, &mode, sizeof mode);
144 device_info = "Generic BSD tun device";
146 case DEVICE_TYPE_TUNIFHEAD:
150 if(ioctl(device_fd, TUNSIFHEAD, &one, sizeof one) == -1) {
151 logger(LOG_ERR, "System call `%s' failed: %s", "ioctl", strerror(errno));
156 #if defined(TUNSIFMODE) && defined(IFF_BROADCAST) && defined(IFF_MULTICAST)
158 const int mode = IFF_BROADCAST | IFF_MULTICAST;
159 ioctl(device_fd, TUNSIFMODE, &mode, sizeof mode);
163 device_info = "Generic BSD tun device";
165 case DEVICE_TYPE_TAP:
166 if(routing_mode == RMODE_ROUTER)
167 overwrite_mac = true;
168 device_info = "Generic BSD tap device";
172 if(ioctl(device_fd, TAPGIFNAME, (void*)&ifr) == 0) {
175 iface = xstrdup(ifr.ifr_name);
182 case DEVICE_TYPE_TUNEMU:
183 device_info = "BSD tunemu device";
188 logger(LOG_INFO, "%s is a %s", device, device_info);
193 static void close_device(void) {
194 switch(device_type) {
196 case DEVICE_TYPE_TUNEMU:
197 tunemu_close(device_fd);
208 static bool read_packet(vpn_packet_t *packet) {
211 switch(device_type) {
212 case DEVICE_TYPE_TUN:
214 case DEVICE_TYPE_TUNEMU:
215 if(device_type == DEVICE_TYPE_TUNEMU)
216 lenin = tunemu_read(device_fd, packet->data + 14, MTU - 14);
219 lenin = read(device_fd, packet->data + 14, MTU - 14);
222 logger(LOG_ERR, "Error while reading from %s %s: %s", device_info,
223 device, strerror(errno));
227 switch(packet->data[14] >> 4) {
229 packet->data[12] = 0x08;
230 packet->data[13] = 0x00;
233 packet->data[12] = 0x86;
234 packet->data[13] = 0xDD;
237 ifdebug(TRAFFIC) logger(LOG_ERR,
238 "Unknown IP version %d while reading packet from %s %s",
239 packet->data[14] >> 4, device_info, device);
243 memset(packet->data, 0, 12);
244 packet->len = lenin + 14;
247 case DEVICE_TYPE_TUNIFHEAD: {
249 struct iovec vector[2] = {{&type, sizeof(type)}, {packet->data + 14, MTU - 14}};
251 if((lenin = readv(device_fd, vector, 2)) <= 0) {
252 logger(LOG_ERR, "Error while reading from %s %s: %s", device_info,
253 device, strerror(errno));
257 switch (ntohl(type)) {
259 packet->data[12] = 0x08;
260 packet->data[13] = 0x00;
264 packet->data[12] = 0x86;
265 packet->data[13] = 0xDD;
269 ifdebug(TRAFFIC) logger(LOG_ERR,
270 "Unknown address family %x while reading packet from %s %s",
271 ntohl(type), device_info, device);
275 memset(packet->data, 0, 12);
276 packet->len = lenin + 10;
280 case DEVICE_TYPE_TAP:
281 if((lenin = read(device_fd, packet->data, MTU)) <= 0) {
282 logger(LOG_ERR, "Error while reading from %s %s: %s", device_info,
283 device, strerror(errno));
294 device_total_in += packet->len;
296 ifdebug(TRAFFIC) logger(LOG_DEBUG, "Read packet of %d bytes from %s",
297 packet->len, device_info);
302 static bool write_packet(vpn_packet_t *packet) {
303 ifdebug(TRAFFIC) logger(LOG_DEBUG, "Writing packet of %d bytes to %s",
304 packet->len, device_info);
306 switch(device_type) {
307 case DEVICE_TYPE_TUN:
308 if(write(device_fd, packet->data + 14, packet->len - 14) < 0) {
309 logger(LOG_ERR, "Error while writing to %s %s: %s", device_info,
310 device, strerror(errno));
315 case DEVICE_TYPE_TUNIFHEAD: {
317 struct iovec vector[2] = {{&type, sizeof(type)}, {packet->data + 14, packet->len - 14}};
320 af = (packet->data[12] << 8) + packet->data[13];
324 type = htonl(AF_INET);
327 type = htonl(AF_INET6);
330 ifdebug(TRAFFIC) logger(LOG_ERR,
331 "Unknown address family %x while writing packet to %s %s",
332 af, device_info, device);
336 if(writev(device_fd, vector, 2) < 0) {
337 logger(LOG_ERR, "Can't write to %s %s: %s", device_info, device,
344 case DEVICE_TYPE_TAP:
345 if(write(device_fd, packet->data, packet->len) < 0) {
346 logger(LOG_ERR, "Error while writing to %s %s: %s", device_info,
347 device, strerror(errno));
353 case DEVICE_TYPE_TUNEMU:
354 if(tunemu_write(device_fd, packet->data + 14, packet->len - 14) < 0) {
355 logger(LOG_ERR, "Error while writing to %s %s: %s", device_info,
356 device, strerror(errno));
366 device_total_out += packet->len;
371 static void dump_device_stats(void) {
372 logger(LOG_DEBUG, "Statistics for %s %s:", device_info, device);
373 logger(LOG_DEBUG, " total bytes in: %10"PRIu64, device_total_in);
374 logger(LOG_DEBUG, " total bytes out: %10"PRIu64, device_total_out);
377 const devops_t os_devops = {
378 .setup = setup_device,
379 .close = close_device,
381 .write = write_packet,
382 .dump_stats = dump_device_stats,