2 device.c -- Interaction with Solaris tun device
3 Copyright (C) 2001-2005 Ivo Timmermans,
4 2002-2010 OpenVPN Technologies, Inc. <sales@openvpn.net>
5 2001-2017 Guus Sliepen <guus@tinc-vpn.org>
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.
23 #include "../system.h"
25 #include <sys/stropts.h>
26 #include <sys/sockio.h>
30 #include "../device.h"
31 #include "../logger.h"
35 #include "../xalloc.h"
38 #warning Missing net/if_tun.h, using hardcoded value for TUNNEWPPA
39 #define TUNNEWPPA (('T'<<16) | 0x0001)
42 #define DEFAULT_TUN_DEVICE "/dev/tun"
43 #define DEFAULT_TAP_DEVICE "/dev/tap"
44 #define IP_DEVICE "/dev/udp"
49 } device_type = DEVICE_TYPE_TUN;
52 static int if_fd = -1;
53 static int ip_fd = -1;
56 static const char *device_info = NULL;
58 uint64_t device_total_in = 0;
59 uint64_t device_total_out = 0;
61 static bool setup_device(void) {
64 if(!get_config_string(lookup_config(config_tree, "Device"), &device)) {
65 if(routing_mode == RMODE_ROUTER) {
66 device = xstrdup(DEFAULT_TUN_DEVICE);
68 device = xstrdup(DEFAULT_TAP_DEVICE);
72 if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
73 if(!strcasecmp(type, "tun"))
75 else if(!strcasecmp(type, "tap")) {
76 device_type = DEVICE_TYPE_TAP;
78 logger(LOG_ERR, "Unknown device type %s!", type);
82 if(strstr(device, "tap") || routing_mode != RMODE_ROUTER) {
83 device_type = DEVICE_TYPE_TAP;
87 if(device_type == DEVICE_TYPE_TUN) {
88 device_info = "Solaris tun device";
90 device_info = "Solaris tap device";
93 if(device_type == DEVICE_TYPE_TAP && routing_mode == RMODE_ROUTER) {
97 /* The following is black magic copied from OpenVPN. */
99 if((ip_fd = open(IP_DEVICE, O_RDWR, 0)) < 0) {
100 logger(LOG_ERR, "Could not open %s: %s\n", IP_DEVICE, strerror(errno));
104 if((device_fd = open(device, O_RDWR, 0)) < 0) {
105 logger(LOG_ERR, "Could not open %s: %s\n", device, strerror(errno));
109 /* Get unit number. */
112 get_config_string(lookup_config(config_tree, "Interface"), &ptr);
114 while(*ptr && !isdigit(*ptr)) {
120 /* Assign a new PPA and get its unit number. */
122 struct strioctl strioc_ppa = {
124 .ic_len = sizeof(ppa),
125 .ic_dp = (char *) &ppa,
128 if(!*ptr) { /* no number given, try dynamic */
131 while(!found && ppa < 64) {
132 int new_ppa = ioctl(device_fd, I_STR, &strioc_ppa);
144 logger(LOG_ERR, "Could not find free PPA for %s %s!", device_info, device);
147 } else { /* try this particular one */
148 if((ppa = ioctl(device_fd, I_STR, &strioc_ppa)) < 0) {
149 logger(LOG_ERR, "Could not assign PPA %d for %s %s!", ppa, device_info, device);
154 if((if_fd = open(device, O_RDWR, 0)) < 0) {
155 logger(LOG_ERR, "Could not open %s: %s\n", device, strerror(errno));
159 if(ioctl(if_fd, I_PUSH, "ip") < 0) {
160 logger(LOG_ERR, "Could not push IP module onto %s %s!", device_info, device);
164 xasprintf(&iface, "%s%d", device_type == DEVICE_TYPE_TUN ? "tun" : "tap", ppa);
167 /* Remove muxes just in case they are left over from a crashed tincd */
168 struct lifreq ifr = {};
169 strncpy(ifr.lifr_name, iface, sizeof(ifr.lifr_name));
171 if(ioctl(ip_fd, SIOCGLIFMUXID, &ifr) >= 0) {
172 int muxid = ifr.lifr_arp_muxid;
173 ioctl(ip_fd, I_PUNLINK, muxid);
174 muxid = ifr.lifr_ip_muxid;
175 ioctl(ip_fd, I_PUNLINK, muxid);
179 if(device_type == DEVICE_TYPE_TUN) {
180 /* Assign ppa according to the unit number returned by tun device */
181 if(ioctl(if_fd, IF_UNITSEL, (char *)&ppa) < 0) {
182 logger(LOG_ERR, "Could not set PPA %d on %s %s!", ppa, device_info, device);
189 if(device_type == DEVICE_TYPE_TAP) {
190 struct lifreq ifr = {};
192 if(ioctl(if_fd, SIOCGLIFFLAGS, &ifr) < 0) {
193 logger(LOG_ERR, "Could not set flags on %s %s!", device_info, device);
197 strncpy(ifr.lifr_name, iface, sizeof(ifr.lifr_name));
200 /* Assign ppa according to the unit number returned by tun device */
201 if(ioctl(if_fd, SIOCSLIFNAME, &ifr) < 0) {
202 logger(LOG_ERR, "Could not set PPA %d on %s %s!", ppa, device_info, device);
206 if(ioctl(if_fd, SIOCGLIFFLAGS, &ifr) < 0) {
207 logger(LOG_ERR, "Could not set flags on %s %s!", device_info, device);
211 /* Push arp module to if_fd */
212 if(ioctl(if_fd, I_PUSH, "arp") < 0) {
213 logger(LOG_ERR, "Could not push ARP module onto %s %s!", device_info, device);
217 /* Pop any modules on the stream */
219 if(ioctl(ip_fd, I_POP, NULL) < 0) {
224 /* Push arp module to ip_fd */
225 if(ioctl(ip_fd, I_PUSH, "arp") < 0) {
226 logger(LOG_ERR, "Could not push ARP module onto %s!", IP_DEVICE);
231 if((arp_fd = open(device, O_RDWR, 0)) < 0) {
232 logger(LOG_ERR, "Could not open %s: %s\n", device, strerror(errno));
236 /* Push arp module to arp_fd */
237 if(ioctl(arp_fd, I_PUSH, "arp") < 0) {
238 logger(LOG_ERR, "Could not push ARP module onto %s %s!", device_info, device);
242 /* Set ifname to arp */
243 struct strioctl strioc_if = {
244 .ic_cmd = SIOCSLIFNAME,
245 .ic_len = sizeof(ifr),
246 .ic_dp = (char *) &ifr,
249 if(ioctl(arp_fd, I_STR, &strioc_if) < 0) {
250 logger(LOG_ERR, "Could not set ifname to %s %s", device_info, device);
255 int ip_muxid, arp_muxid;
257 if((ip_muxid = ioctl(ip_fd, I_PLINK, if_fd)) < 0) {
258 logger(LOG_ERR, "Could not link %s %s to IP", device_info, device);
262 if(device_type == DEVICE_TYPE_TAP) {
263 if((arp_muxid = ioctl(ip_fd, I_PLINK, arp_fd)) < 0) {
264 logger(LOG_ERR, "Could not link %s %s to ARP", device_info, device);
271 struct lifreq ifr = {};
273 strncpy(ifr.lifr_name, iface, sizeof(ifr.lifr_name));
275 ifr.lifr_ip_muxid = ip_muxid;
277 if(device_type == DEVICE_TYPE_TAP) {
278 ifr.lifr_arp_muxid = arp_muxid;
281 if(ioctl(ip_fd, SIOCSLIFMUXID, &ifr) < 0) {
282 if(device_type == DEVICE_TYPE_TAP) {
283 ioctl(ip_fd, I_PUNLINK, arp_muxid);
286 ioctl(ip_fd, I_PUNLINK, ip_muxid);
287 logger(LOG_ERR, "Could not set multiplexor id for %s %s", device_info, device);
294 fcntl(device_fd, F_SETFD, FD_CLOEXEC);
295 fcntl(ip_fd, F_SETFD, FD_CLOEXEC);
298 logger(LOG_INFO, "%s is a %s", device, device_info);
303 static void close_device(void) {
305 struct lifreq ifr = {};
306 strncpy(ifr.lifr_name, iface, sizeof(ifr.lifr_name));
308 if(ioctl(ip_fd, SIOCGLIFMUXID, &ifr) >= 0) {
309 int muxid = ifr.lifr_arp_muxid;
310 ioctl(ip_fd, I_PUNLINK, muxid);
311 muxid = ifr.lifr_ip_muxid;
312 ioctl(ip_fd, I_PUNLINK, muxid);
323 static bool read_packet(vpn_packet_t *packet) {
328 switch(device_type) {
329 case DEVICE_TYPE_TUN:
330 sbuf.maxlen = MTU - 14;
331 sbuf.buf = (char *)packet->data + 14;
333 if((result = getmsg(device_fd, NULL, &sbuf, &f)) < 0) {
334 logger(LOG_ERR, "Error while reading from %s %s: %s", device_info, device, strerror(errno));
338 switch(packet->data[14] >> 4) {
340 packet->data[12] = 0x08;
341 packet->data[13] = 0x00;
345 packet->data[12] = 0x86;
346 packet->data[13] = 0xDD;
350 ifdebug(TRAFFIC) logger(LOG_ERR, "Unknown IP version %d while reading packet from %s %s", packet->data[14] >> 4, device_info, device);
354 memset(packet->data, 0, 12);
355 packet->len = sbuf.len + 14;
358 case DEVICE_TYPE_TAP:
360 sbuf.buf = (char *)packet->data;
362 if((result = getmsg(device_fd, NULL, &sbuf, &f)) < 0) {
363 logger(LOG_ERR, "Error while reading from %s %s: %s", device_info, device, strerror(errno));
367 packet->len = sbuf.len;
374 device_total_in += packet->len;
376 ifdebug(TRAFFIC) logger(LOG_DEBUG, "Read packet of %d bytes from %s", packet->len, device_info);
381 static bool write_packet(vpn_packet_t *packet) {
382 ifdebug(TRAFFIC) logger(LOG_DEBUG, "Writing packet of %d bytes to %s", packet->len, device_info);
386 switch(device_type) {
387 case DEVICE_TYPE_TUN:
388 sbuf.len = packet->len - 14;
389 sbuf.buf = (char *)packet->data + 14;
391 if(putmsg(device_fd, NULL, &sbuf, 0) < 0) {
392 logger(LOG_ERR, "Can't write to %s %s: %s", device_info, device, strerror(errno));
398 case DEVICE_TYPE_TAP:
399 sbuf.len = packet->len;
400 sbuf.buf = (char *)packet->data;
402 if(putmsg(device_fd, NULL, &sbuf, 0) < 0) {
403 logger(LOG_ERR, "Can't write to %s %s: %s", device_info, device, strerror(errno));
413 device_total_out += packet->len;
418 static void dump_device_stats(void) {
419 logger(LOG_DEBUG, "Statistics for %s %s:", device_info, device);
420 logger(LOG_DEBUG, " total bytes in: %10"PRIu64, device_total_in);
421 logger(LOG_DEBUG, " total bytes out: %10"PRIu64, device_total_out);
424 const devops_t os_devops = {
425 .setup = setup_device,
426 .close = close_device,
428 .write = write_packet,
429 .dump_stats = dump_device_stats,