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>
29 #include "../device.h"
30 #include "../logger.h"
34 #include "../xalloc.h"
37 #warning Missing net/if_tun.h, using hardcoded value for TUNNEWPPA
38 #define TUNNEWPPA (('T'<<16) | 0x0001)
41 #define DEFAULT_TUN_DEVICE "/dev/tun"
42 #define DEFAULT_TAP_DEVICE "/dev/tap"
43 #define IP_DEVICE "/dev/udp"
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_total_in = 0;
58 uint64_t device_total_out = 0;
60 static bool setup_device(void) {
63 if(!get_config_string(lookup_config(config_tree, "Device"), &device)) {
64 if(routing_mode == RMODE_ROUTER)
65 device = xstrdup(DEFAULT_TUN_DEVICE);
67 device = xstrdup(DEFAULT_TAP_DEVICE);
70 if(get_config_string(lookup_config(config_tree, "DeviceType"), &type)) {
71 if(!strcasecmp(type, "tun"))
73 else if(!strcasecmp(type, "tap"))
74 device_type = DEVICE_TYPE_TAP;
76 logger(LOG_ERR, "Unknown device type %s!", type);
80 if(strstr(device, "tap") || routing_mode != RMODE_ROUTER)
81 device_type = DEVICE_TYPE_TAP;
84 if(device_type == DEVICE_TYPE_TUN)
85 device_info = "Solaris tun device";
87 device_info = "Solaris tap device";
89 /* The following is black magic copied from OpenVPN. */
91 if((ip_fd = open(IP_DEVICE, O_RDWR, 0)) < 0) {
92 logger(LOG_ERR, "Could not open %s: %s\n", IP_DEVICE, strerror(errno));
96 if((device_fd = open(device, O_RDWR, 0)) < 0) {
97 logger(LOG_ERR, "Could not open %s: %s\n", device, strerror(errno));
101 /* Get unit number. */
104 get_config_string(lookup_config(config_tree, "Interface"), &ptr);
106 while(*ptr && !isdigit(*ptr))
110 /* Assign a new PPA and get its unit number. */
112 struct strioctl strioc_ppa = {
114 .ic_len = sizeof ppa,
115 .ic_dp = (char *)&ppa,
118 if(!*ptr) { /* no number given, try dynamic */
120 while(!found && ppa < 64) {
121 int new_ppa = ioctl(device_fd, I_STR, &strioc_ppa);
130 logger(LOG_ERR, "Could not find free PPA for %s %s!", device_info, device);
133 } else { /* try this particular one */
134 if((ppa = ioctl(device_fd, I_STR, &strioc_ppa)) < 0) {
135 logger(LOG_ERR, "Could not assign PPA %d for %s %s!", ppa, device_info, device);
140 if((if_fd = open(device, O_RDWR, 0)) < 0) {
141 logger(LOG_ERR, "Could not open %s: %s\n", device, strerror(errno));
145 if(ioctl(if_fd, I_PUSH, "ip") < 0) {
146 logger(LOG_ERR, "Could not push IP module onto %s %s!", device_info, device);
150 xasprintf(&iface, "%s%d", device_type == DEVICE_TYPE_TUN ? "tun" : "tap", ppa);
153 /* Remove muxes just in case they are left over from a crashed tincd */
154 struct lifreq ifr = {};
155 strncpy(ifr.lifr_name, iface, sizeof ifr.lifr_name);
156 if(ioctl(ip_fd, SIOCGLIFMUXID, &ifr) >= 0) {
157 int muxid = ifr.lifr_arp_muxid;
158 ioctl(ip_fd, I_PUNLINK, muxid);
159 muxid = ifr.lifr_ip_muxid;
160 ioctl(ip_fd, I_PUNLINK, muxid);
164 if(device_type == DEVICE_TYPE_TUN) {
165 /* Assign ppa according to the unit number returned by tun device */
166 if(ioctl(if_fd, IF_UNITSEL, (char *)&ppa) < 0) {
167 logger(LOG_ERR, "Could not set PPA %d on %s %s!", ppa, device_info, device);
174 if(device_type == DEVICE_TYPE_TAP) {
175 struct lifreq ifr = {};
177 if(ioctl(if_fd, SIOCGLIFFLAGS, &ifr) < 0) {
178 logger(LOG_ERR, "Could not set flags on %s %s!", device_info, device);
182 strncpy(ifr.lifr_name, iface, sizeof(ifr.lifr_name));
185 /* Assign ppa according to the unit number returned by tun device */
186 if(ioctl(if_fd, SIOCSLIFNAME, &ifr) < 0) {
187 logger(LOG_ERR, "Could not set PPA %d on %s %s!", ppa, device_info, device);
190 if(ioctl(if_fd, SIOCGLIFFLAGS, &ifr) < 0) {
191 logger(LOG_ERR, "Could not set flags on %s %s!", device_info, device);
195 /* Push arp module to if_fd */
196 if(ioctl(if_fd, I_PUSH, "arp") < 0) {
197 logger(LOG_ERR, "Could not push ARP module onto %s %s!", device_info, device);
201 /* Pop any modules on the stream */
203 if(ioctl(ip_fd, I_POP, NULL) < 0)
207 /* Push arp module to ip_fd */
208 if(ioctl(ip_fd, I_PUSH, "arp") < 0) {
209 logger(LOG_ERR, "Could not push ARP module onto %s!", IP_DEVICE);
214 if((arp_fd = open(device, O_RDWR, 0)) < 0) {
215 logger(LOG_ERR, "Could not open %s: %s\n", device, strerror(errno));
219 /* Push arp module to arp_fd */
220 if(ioctl(arp_fd, I_PUSH, "arp") < 0) {
221 logger(LOG_ERR, "Could not push ARP module onto %s %s!", device_info, device);
225 /* Set ifname to arp */
226 struct strioctl strioc_if = {
227 .ic_cmd = SIOCSLIFNAME,
228 .ic_len = sizeof ifr,
229 .ic_dp = (char *)&ifr,
232 if(ioctl(arp_fd, I_STR, &strioc_if) < 0) {
233 logger(LOG_ERR, "Could not set ifname to %s %s", device_info, device);
238 int ip_muxid, arp_muxid;
240 if((ip_muxid = ioctl(ip_fd, I_PLINK, if_fd)) < 0) {
241 logger(LOG_ERR, "Could not link %s %s to IP", device_info, device);
245 if(device_type == DEVICE_TYPE_TAP) {
246 if((arp_muxid = ioctl(ip_fd, I_PLINK, arp_fd)) < 0) {
247 logger(LOG_ERR, "Could not link %s %s to ARP", device_info, device);
253 struct lifreq ifr = {};
254 strncpy(ifr.lifr_name, iface, sizeof(ifr.lifr_name));
255 ifr.lifr_ip_muxid = ip_muxid;
256 if(device_type == DEVICE_TYPE_TAP) {
257 ifr.lifr_arp_muxid = arp_muxid;
260 if(ioctl(ip_fd, SIOCSLIFMUXID, &ifr) < 0) {
261 if(device_type == DEVICE_TYPE_TAP) {
262 ioctl(ip_fd, I_PUNLINK, arp_muxid);
264 ioctl(ip_fd, I_PUNLINK, ip_muxid);
265 logger(LOG_ERR, "Could not set multiplexor id for %s %s", device_info, device);
272 fcntl(device_fd, F_SETFD, FD_CLOEXEC);
273 fcntl(ip_fd, F_SETFD, FD_CLOEXEC);
276 logger(LOG_INFO, "%s is a %s", device, device_info);
281 static void close_device(void) {
283 struct lifreq ifr = {};
284 strncpy(ifr.lifr_name, iface, sizeof ifr.lifr_name);
285 if(ioctl(ip_fd, SIOCGLIFMUXID, &ifr) >= 0) {
286 int muxid = ifr.lifr_arp_muxid;
287 ioctl(ip_fd, I_PUNLINK, muxid);
288 muxid = ifr.lifr_ip_muxid;
289 ioctl(ip_fd, I_PUNLINK, muxid);
300 static bool read_packet(vpn_packet_t *packet) {
303 switch(device_type) {
304 case DEVICE_TYPE_TUN:
305 if((inlen = read(device_fd, packet->data + 14, MTU - 14)) <= 0) {
306 logger(LOG_ERR, "Error while reading from %s %s: %s", device_info, device, strerror(errno));
310 switch(packet->data[14] >> 4) {
312 packet->data[12] = 0x08;
313 packet->data[13] = 0x00;
316 packet->data[12] = 0x86;
317 packet->data[13] = 0xDD;
320 ifdebug(TRAFFIC) logger(LOG_ERR, "Unknown IP version %d while reading packet from %s %s", packet->data[14] >> 4, device_info, device);
324 memset(packet->data, 0, 12);
325 packet->len = inlen + 14;
328 case DEVICE_TYPE_TAP:
329 if((inlen = read(device_fd, packet->data, MTU)) <= 0) {
330 logger(LOG_ERR, "Error while reading from %s %s: %s", device_info, device, strerror(errno));
334 packet->len = inlen + 14;
341 device_total_in += packet->len;
343 ifdebug(TRAFFIC) logger(LOG_DEBUG, "Read packet of %d bytes from %s", packet->len, device_info);
348 static bool write_packet(vpn_packet_t *packet) {
349 ifdebug(TRAFFIC) logger(LOG_DEBUG, "Writing packet of %d bytes to %s", packet->len, device_info);
351 switch(device_type) {
352 case DEVICE_TYPE_TUN:
353 if(write(device_fd, packet->data + 14, packet->len - 14) < 0) {
354 logger(LOG_ERR, "Can't write to %s %s: %s", device_info, device, strerror(errno));
359 case DEVICE_TYPE_TAP:
360 if(write(device_fd, packet->data, packet->len) < 0) {
361 logger(LOG_ERR, "Can't write to %s %s: %s", device_info, device, strerror(errno));
370 device_total_out += packet->len;
375 static void dump_device_stats(void) {
376 logger(LOG_DEBUG, "Statistics for %s %s:", device_info, device);
377 logger(LOG_DEBUG, " total bytes in: %10"PRIu64, device_total_in);
378 logger(LOG_DEBUG, " total bytes out: %10"PRIu64, device_total_out);
381 const devops_t os_devops = {
382 .setup = setup_device,
383 .close = close_device,
385 .write = write_packet,
386 .dump_stats = dump_device_stats,