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 2001-2014 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 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);
71 if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
72 if(!strcasecmp(type, "tun"))
74 else if(!strcasecmp(type, "tap"))
75 device_type = DEVICE_TYPE_TAP;
77 logger(LOG_ERR, "Unknown device type %s!", type);
81 if(strstr(device, "tap") || routing_mode != RMODE_ROUTER)
82 device_type = DEVICE_TYPE_TAP;
85 if(device_type == DEVICE_TYPE_TUN)
86 device_info = "Solaris tun device";
88 device_info = "Solaris tap device";
90 if(device_type == DEVICE_TYPE_TAP && routing_mode == RMODE_ROUTER)
93 /* The following is black magic copied from OpenVPN. */
95 if((ip_fd = open(IP_DEVICE, O_RDWR, 0)) < 0) {
96 logger(LOG_ERR, "Could not open %s: %s\n", IP_DEVICE, strerror(errno));
100 if((device_fd = open(device, O_RDWR, 0)) < 0) {
101 logger(LOG_ERR, "Could not open %s: %s\n", device, strerror(errno));
105 /* Get unit number. */
108 get_config_string(lookup_config(config_tree, "Interface"), &ptr);
110 while(*ptr && !isdigit(*ptr))
114 /* Assign a new PPA and get its unit number. */
116 struct strioctl strioc_ppa = {
118 .ic_len = sizeof ppa,
119 .ic_dp = (char *)&ppa,
122 if(!*ptr) { /* no number given, try dynamic */
124 while(!found && ppa < 64) {
125 int new_ppa = ioctl(device_fd, I_STR, &strioc_ppa);
134 logger(LOG_ERR, "Could not find free PPA for %s %s!", device_info, device);
137 } else { /* try this particular one */
138 if((ppa = ioctl(device_fd, I_STR, &strioc_ppa)) < 0) {
139 logger(LOG_ERR, "Could not assign PPA %d for %s %s!", ppa, device_info, device);
144 if((if_fd = open(device, O_RDWR, 0)) < 0) {
145 logger(LOG_ERR, "Could not open %s: %s\n", device, strerror(errno));
149 if(ioctl(if_fd, I_PUSH, "ip") < 0) {
150 logger(LOG_ERR, "Could not push IP module onto %s %s!", device_info, device);
154 xasprintf(&iface, "%s%d", device_type == DEVICE_TYPE_TUN ? "tun" : "tap", ppa);
157 /* Remove muxes just in case they are left over from a crashed tincd */
158 struct lifreq ifr = {};
159 strncpy(ifr.lifr_name, iface, sizeof ifr.lifr_name);
160 if(ioctl(ip_fd, SIOCGLIFMUXID, &ifr) >= 0) {
161 int muxid = ifr.lifr_arp_muxid;
162 ioctl(ip_fd, I_PUNLINK, muxid);
163 muxid = ifr.lifr_ip_muxid;
164 ioctl(ip_fd, I_PUNLINK, muxid);
168 if(device_type == DEVICE_TYPE_TUN) {
169 /* Assign ppa according to the unit number returned by tun device */
170 if(ioctl(if_fd, IF_UNITSEL, (char *)&ppa) < 0) {
171 logger(LOG_ERR, "Could not set PPA %d on %s %s!", ppa, device_info, device);
178 if(device_type == DEVICE_TYPE_TAP) {
179 struct lifreq ifr = {};
181 if(ioctl(if_fd, SIOCGLIFFLAGS, &ifr) < 0) {
182 logger(LOG_ERR, "Could not set flags on %s %s!", device_info, device);
186 strncpy(ifr.lifr_name, iface, sizeof(ifr.lifr_name));
189 /* Assign ppa according to the unit number returned by tun device */
190 if(ioctl(if_fd, SIOCSLIFNAME, &ifr) < 0) {
191 logger(LOG_ERR, "Could not set PPA %d on %s %s!", ppa, device_info, device);
194 if(ioctl(if_fd, SIOCGLIFFLAGS, &ifr) < 0) {
195 logger(LOG_ERR, "Could not set flags on %s %s!", device_info, device);
199 /* Push arp module to if_fd */
200 if(ioctl(if_fd, I_PUSH, "arp") < 0) {
201 logger(LOG_ERR, "Could not push ARP module onto %s %s!", device_info, device);
205 /* Pop any modules on the stream */
207 if(ioctl(ip_fd, I_POP, NULL) < 0)
211 /* Push arp module to ip_fd */
212 if(ioctl(ip_fd, I_PUSH, "arp") < 0) {
213 logger(LOG_ERR, "Could not push ARP module onto %s!", IP_DEVICE);
218 if((arp_fd = open(device, O_RDWR, 0)) < 0) {
219 logger(LOG_ERR, "Could not open %s: %s\n", device, strerror(errno));
223 /* Push arp module to arp_fd */
224 if(ioctl(arp_fd, I_PUSH, "arp") < 0) {
225 logger(LOG_ERR, "Could not push ARP module onto %s %s!", device_info, device);
229 /* Set ifname to arp */
230 struct strioctl strioc_if = {
231 .ic_cmd = SIOCSLIFNAME,
232 .ic_len = sizeof ifr,
233 .ic_dp = (char *)&ifr,
236 if(ioctl(arp_fd, I_STR, &strioc_if) < 0) {
237 logger(LOG_ERR, "Could not set ifname to %s %s", device_info, device);
242 int ip_muxid, arp_muxid;
244 if((ip_muxid = ioctl(ip_fd, I_PLINK, if_fd)) < 0) {
245 logger(LOG_ERR, "Could not link %s %s to IP", device_info, device);
249 if(device_type == DEVICE_TYPE_TAP) {
250 if((arp_muxid = ioctl(ip_fd, I_PLINK, arp_fd)) < 0) {
251 logger(LOG_ERR, "Could not link %s %s to ARP", device_info, device);
257 struct lifreq ifr = {};
258 strncpy(ifr.lifr_name, iface, sizeof(ifr.lifr_name));
259 ifr.lifr_ip_muxid = ip_muxid;
260 if(device_type == DEVICE_TYPE_TAP) {
261 ifr.lifr_arp_muxid = arp_muxid;
264 if(ioctl(ip_fd, SIOCSLIFMUXID, &ifr) < 0) {
265 if(device_type == DEVICE_TYPE_TAP) {
266 ioctl(ip_fd, I_PUNLINK, arp_muxid);
268 ioctl(ip_fd, I_PUNLINK, ip_muxid);
269 logger(LOG_ERR, "Could not set multiplexor id for %s %s", device_info, device);
276 fcntl(device_fd, F_SETFD, FD_CLOEXEC);
277 fcntl(ip_fd, F_SETFD, FD_CLOEXEC);
280 logger(LOG_INFO, "%s is a %s", device, device_info);
285 static void close_device(void) {
287 struct lifreq ifr = {};
288 strncpy(ifr.lifr_name, iface, sizeof ifr.lifr_name);
289 if(ioctl(ip_fd, SIOCGLIFMUXID, &ifr) >= 0) {
290 int muxid = ifr.lifr_arp_muxid;
291 ioctl(ip_fd, I_PUNLINK, muxid);
292 muxid = ifr.lifr_ip_muxid;
293 ioctl(ip_fd, I_PUNLINK, muxid);
304 static bool read_packet(vpn_packet_t *packet) {
309 switch(device_type) {
310 case DEVICE_TYPE_TUN:
311 sbuf.maxlen = MTU - 14;
312 sbuf.buf = (char *)packet->data + 14;
314 if((result = getmsg(device_fd, NULL, &sbuf, &f)) < 0) {
315 logger(LOG_ERR, "Error while reading from %s %s: %s", device_info, device, strerror(errno));
319 switch(packet->data[14] >> 4) {
321 packet->data[12] = 0x08;
322 packet->data[13] = 0x00;
325 packet->data[12] = 0x86;
326 packet->data[13] = 0xDD;
329 ifdebug(TRAFFIC) logger(LOG_ERR, "Unknown IP version %d while reading packet from %s %s", packet->data[14] >> 4, device_info, device);
333 memset(packet->data, 0, 12);
334 packet->len = sbuf.len + 14;
337 case DEVICE_TYPE_TAP:
339 sbuf.buf = (char *)packet->data;
341 if((result = getmsg(device_fd, NULL, &sbuf, &f)) < 0) {
342 logger(LOG_ERR, "Error while reading from %s %s: %s", device_info, device, strerror(errno));
346 packet->len = sbuf.len;
353 device_total_in += packet->len;
355 ifdebug(TRAFFIC) logger(LOG_DEBUG, "Read packet of %d bytes from %s", packet->len, device_info);
360 static bool write_packet(vpn_packet_t *packet) {
361 ifdebug(TRAFFIC) logger(LOG_DEBUG, "Writing packet of %d bytes to %s", packet->len, device_info);
365 switch(device_type) {
366 case DEVICE_TYPE_TUN:
367 sbuf.len = packet->len - 14;
368 sbuf.buf = (char *)packet->data + 14;
370 if(putmsg(device_fd, NULL, &sbuf, 0) < 0) {
371 logger(LOG_ERR, "Can't write to %s %s: %s", device_info, device, strerror(errno));
376 case DEVICE_TYPE_TAP:
377 sbuf.len = packet->len;
378 sbuf.buf = (char *)packet->data;
380 if(putmsg(device_fd, NULL, &sbuf, 0) < 0) {
381 logger(LOG_ERR, "Can't write to %s %s: %s", device_info, device, strerror(errno));
390 device_total_out += packet->len;
395 static void dump_device_stats(void) {
396 logger(LOG_DEBUG, "Statistics for %s %s:", device_info, device);
397 logger(LOG_DEBUG, " total bytes in: %10"PRIu64, device_total_in);
398 logger(LOG_DEBUG, " total bytes out: %10"PRIu64, device_total_out);
401 const devops_t os_devops = {
402 .setup = setup_device,
403 .close = close_device,
405 .write = write_packet,
406 .dump_stats = dump_device_stats,