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 2001-2013 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>
29 #include "../device.h"
30 #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"
48 } device_type = DEVICE_TYPE_TUN;
51 static int if_fd = -1;
52 static int ip_fd = -1;
55 static char *device_info = NULL;
57 uint64_t device_in_packets = 0;
58 uint64_t device_in_bytes = 0;
59 uint64_t device_out_packets = 0;
60 uint64_t device_out_bytes = 0;
62 static bool setup_device(void) {
65 if(!get_config_string(lookup_config(config_tree, "Device"), &device)) {
66 if(routing_mode == RMODE_ROUTER)
67 device = xstrdup(DEFAULT_TUN_DEVICE);
69 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(DEBUG_ALWAYS, LOG_ERR, "Unknown device type %s!", type);
82 if(strstr(device, "tap") || routing_mode != RMODE_ROUTER)
83 device_type = DEVICE_TYPE_TAP;
86 if(device_type == DEVICE_TYPE_TUN)
87 device_info = "Solaris tun device";
89 device_info = "Solaris tap device";
91 /* The following is black magic copied from OpenVPN. */
93 if((ip_fd = open("/dev/ip", O_RDWR, 0)) < 0) {
94 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s\n", "/dev/ip", strerror(errno));
98 if((device_fd = open(device, O_RDWR, 0)) < 0) {
99 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s\n", device, strerror(errno));
103 /* Get unit number. */
106 get_config_string(lookup_config(config_tree, "Interface"), &ptr);
108 while(*ptr && !isdigit(*ptr))
112 /* Assign a new PPA and get its unit number. */
114 struct strioctl strioc_ppa = {
116 .ic_len = sizeof ppa,
117 .ic_dp = (char *)&ppa,
120 if(!*ptr) { /* no number given, try dynamic */
122 while(!found && ppa < 64) {
123 int new_ppa = ioctl(device_fd, I_STR, &strioc_ppa);
132 logger(DEBUG_ALWAYS, LOG_ERR, "Could not find free PPA for %s %s!", device_info, device);
135 } else { /* try this particular one */
136 if((ppa = ioctl(device_fd, I_STR, &strioc_ppa)) < 0) {
137 logger(DEBUG_ALWAYS, LOG_ERR, "Could not assign PPA %d for %s %s!", ppa, device_info, device);
142 if((if_fd = open(device, O_RDWR, 0)) < 0) {
143 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s\n", device, strerror(errno));
147 if(ioctl(if_fd, I_PUSH, "ip") < 0) {
148 logger(DEBUG_ALWAYS, LOG_ERR, "Could not push IP module onto %s %s!", device_info, device);
152 xasprintf(&iface, "%s%d", device_type == DEVICE_TYPE_TUN ? "tun" : "tap", ppa);
155 /* Remove muxes just in case they are left over from a crashed tincd */
156 struct lifreq ifr = {};
157 strncpy(ifr.lifr_name, iface, sizeof ifr.lifr_name);
158 if(ioctl(ip_fd, SIOCGLIFMUXID, &ifr) >= 0) {
159 int muxid = ifr.lifr_arp_muxid;
160 ioctl(ip_fd, I_PUNLINK, muxid);
161 muxid = ifr.lifr_ip_muxid;
162 ioctl(ip_fd, I_PUNLINK, muxid);
166 if(device_type == DEVICE_TYPE_TUN) {
167 /* Assign ppa according to the unit number returned by tun device */
168 if(ioctl(if_fd, IF_UNITSEL, (char *)&ppa) < 0) {
169 logger(DEBUG_ALWAYS, LOG_ERR, "Could not set PPA %d on %s %s!", ppa, device_info, device);
176 if(device_type == DEVICE_TYPE_TAP) {
177 struct lifreq ifr = {};
179 if(ioctl(if_fd, SIOCGLIFFLAGS, &ifr) < 0) {
180 logger(DEBUG_ALWAYS, LOG_ERR, "Could not set flags on %s %s!", device_info, device);
184 strncpy(ifr.lifr_name, iface, sizeof(ifr.lifr_name));
187 /* Assign ppa according to the unit number returned by tun device */
188 if(ioctl(if_fd, SIOCSLIFNAME, &ifr) < 0) {
189 logger(DEBUG_ALWAYS, LOG_ERR, "Could not set PPA %d on %s %s!", ppa, device_info, device);
192 if(ioctl(if_fd, SIOCGLIFFLAGS, &ifr) < 0) {
193 logger(DEBUG_ALWAYS, LOG_ERR, "Could not set flags on %s %s!", device_info, device);
197 /* Push arp module to if_fd */
198 if(ioctl(if_fd, I_PUSH, "arp") < 0) {
199 logger(DEBUG_ALWAYS, LOG_ERR, "Could not push ARP module onto %s %s!", device_info, device);
203 /* Pop any modules on the stream */
205 if(ioctl(ip_fd, I_POP, NULL) < 0)
209 /* Push arp module to ip_fd */
210 if(ioctl(ip_fd, I_PUSH, "arp") < 0) {
211 logger(DEBUG_ALWAYS, LOG_ERR, "Could not push ARP module onto %s!", "/dev/ip");
216 if((arp_fd = open(device, O_RDWR, 0)) < 0) {
217 logger(DEBUG_ALWAYS, LOG_ERR, "Could not open %s: %s\n", device, strerror(errno));
221 /* Push arp module to arp_fd */
222 if(ioctl(arp_fd, I_PUSH, "arp") < 0) {
223 logger(DEBUG_ALWAYS, LOG_ERR, "Could not push ARP module onto %s %s!", device_info, device);
227 /* Set ifname to arp */
228 struct strioctl strioc_if = {
229 .ic_cmd = SIOCSLIFNAME,
230 .ic_len = sizeof ifr,
231 .ic_dp = (char *)&ifr,
234 if(ioctl(arp_fd, I_STR, &strioc_if) < 0) {
235 logger(DEBUG_ALWAYS, LOG_ERR, "Could not set ifname to %s %s", device_info, device);
240 int ip_muxid, arp_muxid;
242 if((ip_muxid = ioctl(ip_fd, I_PLINK, if_fd)) < 0) {
243 logger(DEBUG_ALWAYS, LOG_ERR, "Could not link %s %s to IP", device_info, device);
247 if(device_type == DEVICE_TYPE_TAP) {
248 if((arp_muxid = ioctl(ip_fd, I_PLINK, arp_fd)) < 0) {
249 logger(DEBUG_ALWAYS, LOG_ERR, "Could not link %s %s to ARP", device_info, device);
255 struct lifreq ifr = {};
256 strncpy(ifr.lifr_name, iface, sizeof(ifr.lifr_name));
257 ifr.lifr_ip_muxid = ip_muxid;
258 if(device_type == DEVICE_TYPE_TAP) {
259 ifr.lifr_arp_muxid = arp_muxid;
262 if(ioctl(ip_fd, SIOCSLIFMUXID, &ifr) < 0) {
263 if(device_type == DEVICE_TYPE_TAP) {
264 ioctl(ip_fd, I_PUNLINK, arp_muxid);
266 ioctl(ip_fd, I_PUNLINK, ip_muxid);
267 logger(DEBUG_ALWAYS, LOG_ERR, "Could not set multiplexor id for %s %s", device_info, device);
274 fcntl(device_fd, F_SETFD, FD_CLOEXEC);
275 fcntl(ip_fd, F_SETFD, FD_CLOEXEC);
278 logger(DEBUG_ALWAYS, LOG_INFO, "%s is a %s", device, device_info);
283 static void close_device(void) {
285 struct lifreq ifr = {};
286 strncpy(ifr.lifr_name, iface, sizeof ifr.lifr_name);
287 if(ioctl(ip_fd, SIOCGLIFMUXID, &ifr) >= 0) {
288 int muxid = ifr.lifr_arp_muxid;
289 ioctl(ip_fd, I_PUNLINK, muxid);
290 muxid = ifr.lifr_ip_muxid;
291 ioctl(ip_fd, I_PUNLINK, muxid);
302 static bool read_packet(vpn_packet_t *packet) {
305 switch(device_type) {
306 case DEVICE_TYPE_TUN:
307 if((inlen = read(device_fd, packet->data + 14, MTU - 14)) <= 0) {
308 logger(DEBUG_ALWAYS, LOG_ERR, "Error while reading from %s %s: %s", device_info, device, strerror(errno));
312 switch(packet->data[14] >> 4) {
314 packet->data[12] = 0x08;
315 packet->data[13] = 0x00;
318 packet->data[12] = 0x86;
319 packet->data[13] = 0xDD;
322 logger(DEBUG_TRAFFIC, LOG_ERR, "Unknown IP version %d while reading packet from %s %s", packet->data[14] >> 4, device_info, device);
326 memset(packet->data, 0, 12);
327 packet->len = inlen + 14;
330 case DEVICE_TYPE_TAP:
331 if((inlen = read(device_fd, packet->data, MTU)) <= 0) {
332 logger(DEBUG_ALWAYS, LOG_ERR, "Error while reading from %s %s: %s", device_info, device, strerror(errno));
336 packet->len = inlen + 14;
344 device_in_bytes += packet->len;
346 logger(DEBUG_TRAFFIC, LOG_DEBUG, "Read packet of %d bytes from %s", packet->len, device_info);
351 static bool write_packet(vpn_packet_t *packet) {
352 logger(DEBUG_TRAFFIC, LOG_DEBUG, "Writing packet of %d bytes to %s", packet->len, device_info);
354 switch(device_type) {
355 case DEVICE_TYPE_TUN:
356 if(write(device_fd, packet->data + 14, packet->len - 14) < 0) {
357 logger(DEBUG_ALWAYS, LOG_ERR, "Can't write to %s %s: %s", device_info, device, strerror(errno));
362 case DEVICE_TYPE_TAP:
363 if(write(device_fd, packet->data, packet->len) < 0) {
364 logger(DEBUG_ALWAYS, LOG_ERR, "Can't write to %s %s: %s", device_info, device, strerror(errno));
373 device_out_packets++;
374 device_out_bytes += packet->len;
379 static void dump_device_stats(void) {
380 logger(DEBUG_ALWAYS, LOG_DEBUG, "Statistics for %s %s:", device_info, device);
381 logger(DEBUG_ALWAYS, LOG_DEBUG, " total bytes in: %10"PRIu64, device_in_bytes);
382 logger(DEBUG_ALWAYS, LOG_DEBUG, " total bytes out: %10"PRIu64, device_out_bytes);
385 const devops_t os_devops = {
386 .setup = setup_device,
387 .close = close_device,
389 .write = write_packet,
390 .dump_stats = dump_device_stats,