Commit | Line | Data |
---|---|---|
9d3a4132 SE |
1 | #include "secnet.h" |
2 | #include "util.h" | |
3 | #include "netlink.h" | |
4 | #include <stdio.h> | |
5 | #include <string.h> | |
090dbeef | 6 | #include <errno.h> |
9d3a4132 SE |
7 | #include <unistd.h> |
8 | #include <fcntl.h> | |
9 | #include <sys/ioctl.h> | |
ff05a229 SE |
10 | #include <sys/utsname.h> |
11 | #include <sys/socket.h> | |
9d3a4132 | 12 | |
ff05a229 SE |
13 | #ifdef HAVE_NET_IF_H |
14 | #include <net/if.h> | |
9d3a4132 | 15 | #ifdef HAVE_LINUX_IF_H |
9d3a4132 | 16 | #include <linux/if_tun.h> |
ff05a229 | 17 | #define LINUX_TUN_SUPPORTED |
9d3a4132 | 18 | #endif |
ff05a229 SE |
19 | #endif |
20 | ||
21 | #ifdef HAVE_NET_ROUTE_H | |
22 | #include <net/route.h> | |
23 | #endif | |
24 | ||
25 | #if defined(HAVE_STROPTS_H) && defined(HAVE_SYS_SOCKIO_H) && \ | |
26 | defined(HAVE_NET_IF_TUN_H) | |
27 | #define HAVE_TUN_STREAMS | |
28 | #endif | |
29 | ||
30 | #ifdef HAVE_TUN_STREAMS | |
31 | #include <stropts.h> | |
32 | #include <sys/sockio.h> | |
33 | #include <net/if_tun.h> | |
34 | #endif | |
35 | ||
36 | #define TUN_FLAVOUR_GUESS 0 | |
37 | #define TUN_FLAVOUR_BSD 1 | |
38 | #define TUN_FLAVOUR_LINUX 2 | |
39 | #define TUN_FLAVOUR_STREAMS 3 | |
40 | ||
41 | static struct flagstr flavours[]={ | |
42 | {"guess", TUN_FLAVOUR_GUESS}, | |
43 | {"bsd", TUN_FLAVOUR_BSD}, | |
44 | {"BSD", TUN_FLAVOUR_BSD}, | |
45 | {"linux", TUN_FLAVOUR_LINUX}, | |
46 | {"streams", TUN_FLAVOUR_STREAMS}, | |
47 | {"STREAMS", TUN_FLAVOUR_STREAMS}, | |
48 | {NULL, 0} | |
49 | }; | |
9d3a4132 | 50 | |
ff05a229 SE |
51 | #define TUN_CONFIG_GUESS 0 |
52 | #define TUN_CONFIG_IOCTL 1 | |
53 | #define TUN_CONFIG_BSD 2 | |
54 | #define TUN_CONFIG_LINUX 3 | |
55 | #define TUN_CONFIG_SOLARIS25 4 | |
56 | ||
57 | static struct flagstr config_types[]={ | |
58 | {"guess", TUN_CONFIG_GUESS}, | |
59 | {"ioctl", TUN_CONFIG_IOCTL}, | |
60 | {"bsd", TUN_CONFIG_BSD}, | |
61 | {"BSD", TUN_CONFIG_BSD}, | |
62 | {"linux", TUN_CONFIG_LINUX}, | |
63 | {"solaris-2.5", TUN_CONFIG_SOLARIS25}, | |
64 | {NULL, 0} | |
65 | }; | |
9d3a4132 SE |
66 | |
67 | /* Connection to the kernel through the universal TUN/TAP driver */ | |
68 | ||
69 | struct tun { | |
70 | struct netlink nl; | |
71 | int fd; | |
fe5e9cc4 SE |
72 | cstring_t device_path; |
73 | cstring_t ip_path; | |
9d3a4132 | 74 | string_t interface_name; |
fe5e9cc4 | 75 | cstring_t ifconfig_path; |
ff05a229 | 76 | uint32_t ifconfig_type; |
fe5e9cc4 | 77 | cstring_t route_path; |
ff05a229 SE |
78 | uint32_t route_type; |
79 | uint32_t tun_flavour; | |
80 | bool_t search_for_if; /* Applies to tun-BSD only */ | |
9d3a4132 SE |
81 | struct buffer_if *buff; /* We receive packets into here |
82 | and send them to the netlink code. */ | |
83 | netlink_deliver_fn *netlink_to_tunnel; | |
84 | }; | |
85 | ||
fe5e9cc4 | 86 | static cstring_t tun_flavour_str(uint32_t flavour) |
ff05a229 SE |
87 | { |
88 | switch (flavour) { | |
89 | case TUN_FLAVOUR_GUESS: return "guess"; | |
90 | case TUN_FLAVOUR_BSD: return "BSD"; | |
91 | case TUN_FLAVOUR_LINUX: return "linux"; | |
92 | case TUN_FLAVOUR_STREAMS: return "STREAMS"; | |
93 | default: return "unknown"; | |
94 | } | |
95 | } | |
96 | ||
9d3a4132 | 97 | static int tun_beforepoll(void *sst, struct pollfd *fds, int *nfds_io, |
90a39563 | 98 | int *timeout_io) |
9d3a4132 SE |
99 | { |
100 | struct tun *st=sst; | |
ee697dd9 | 101 | BEFOREPOLL_WANT_FDS(1); |
9d3a4132 | 102 | fds[0].fd=st->fd; |
fe5e9cc4 | 103 | fds[0].events=POLLIN; |
9d3a4132 SE |
104 | return 0; |
105 | } | |
106 | ||
90a39563 | 107 | static void tun_afterpoll(void *sst, struct pollfd *fds, int nfds) |
9d3a4132 SE |
108 | { |
109 | struct tun *st=sst; | |
110 | int l; | |
111 | ||
7138d0c5 | 112 | if (nfds==0) return; |
9d3a4132 SE |
113 | if (fds[0].revents&POLLERR) { |
114 | printf("tun_afterpoll: hup!\n"); | |
115 | } | |
116 | if (fds[0].revents&POLLIN) { | |
117 | BUF_ALLOC(st->buff,"tun_afterpoll"); | |
3abd18e8 | 118 | buffer_init(st->buff,calculate_max_start_pad()); |
92795040 | 119 | l=read(st->fd, st->buff->start, buf_remaining_space(st->buff)); |
9d3a4132 | 120 | if (l<0) { |
ba703386 | 121 | if (errno==EINTR || iswouldblock(errno)) return; |
9d3a4132 SE |
122 | fatal_perror("tun_afterpoll: read()"); |
123 | } | |
124 | if (l==0) { | |
4f5e39ec | 125 | fatal("tun_afterpoll: read()=0; device gone away?"); |
9d3a4132 SE |
126 | } |
127 | if (l>0) { | |
128 | st->buff->size=l; | |
469fd1d9 | 129 | st->netlink_to_tunnel(&st->nl,st->buff); |
9d3a4132 SE |
130 | BUF_ASSERT_FREE(st->buff); |
131 | } | |
132 | } | |
133 | } | |
134 | ||
469fd1d9 | 135 | static void tun_deliver_to_kernel(void *sst, struct buffer_if *buf) |
9d3a4132 SE |
136 | { |
137 | struct tun *st=sst; | |
090dbeef | 138 | ssize_t rc; |
9d3a4132 SE |
139 | |
140 | BUF_ASSERT_USED(buf); | |
090dbeef RK |
141 | |
142 | /* Log errors, so we can tell what's going on, but only once a | |
143 | minute, so we don't flood the logs. Short writes count as | |
144 | errors. */ | |
145 | rc = write(st->fd,buf->start,buf->size); | |
146 | if(rc != buf->size) { | |
147 | static struct timeval last_report; | |
148 | if(tv_now_global.tv_sec >= last_report.tv_sec + 60) { | |
149 | if(rc < 0) | |
150 | Message(M_WARNING, | |
151 | "failed to deliver packet to tun device: %s\n", | |
152 | strerror(errno)); | |
153 | else | |
154 | Message(M_WARNING, | |
155 | "truncated packet delivered to tun device\n"); | |
156 | last_report = tv_now_global; | |
157 | } | |
158 | } | |
9d3a4132 SE |
159 | BUF_FREE(buf); |
160 | } | |
161 | ||
d3fe100d | 162 | static bool_t tun_set_route(void *sst, struct netlink_client *routes) |
9d3a4132 SE |
163 | { |
164 | struct tun *st=sst; | |
165 | string_t network, mask, secnetaddr; | |
d3fe100d | 166 | struct subnet_list *nets; |
1caa23ff | 167 | int32_t i; |
ff05a229 | 168 | int fd=-1; |
efacf9e0 | 169 | bool_t up; |
ff05a229 | 170 | |
efacf9e0 ST |
171 | if (routes->options & OPT_SOFTROUTE) |
172 | up = routes->up; | |
173 | else | |
174 | up = routes->link_quality > LINK_QUALITY_UNUSED; | |
175 | ||
176 | if (up == routes->kup) return False; | |
ff05a229 SE |
177 | if (st->route_type==TUN_CONFIG_IOCTL) { |
178 | if (st->tun_flavour==TUN_FLAVOUR_STREAMS) { | |
179 | fd=open(st->ip_path,O_RDWR); | |
180 | if (fd<0) { | |
181 | fatal_perror("tun_set_route: can't open %s",st->ip_path); | |
182 | } | |
183 | } else { | |
184 | fd=socket(PF_INET, SOCK_DGRAM, IPPROTO_IP); | |
185 | if (fd<0) { | |
186 | fatal_perror("tun_set_route: socket()"); | |
187 | } | |
188 | } | |
189 | } | |
190 | nets=routes->subnets; | |
191 | secnetaddr=ipaddr_to_string(st->nl.secnet_address); | |
192 | for (i=0; i<nets->entries; i++) { | |
193 | network=ipaddr_to_string(nets->list[i].prefix); | |
194 | mask=ipaddr_to_string(nets->list[i].mask); | |
195 | Message(M_INFO,"%s: %s route %s/%d %s kernel routing table\n", | |
efacf9e0 ST |
196 | st->nl.name,up?"adding":"deleting",network, |
197 | nets->list[i].len,up?"to":"from"); | |
ff05a229 SE |
198 | switch (st->route_type) { |
199 | case TUN_CONFIG_LINUX: | |
efacf9e0 | 200 | sys_cmd(st->route_path,"route",up?"add":"del", |
ff05a229 SE |
201 | "-net",network,"netmask",mask, |
202 | "gw",secnetaddr,(char *)0); | |
203 | break; | |
204 | case TUN_CONFIG_BSD: | |
efacf9e0 | 205 | sys_cmd(st->route_path,"route",up?"add":"del", |
ff05a229 SE |
206 | "-net",network,secnetaddr,mask,(char *)0); |
207 | break; | |
208 | case TUN_CONFIG_SOLARIS25: | |
efacf9e0 | 209 | sys_cmd(st->route_path,"route",up?"add":"del", |
ff05a229 SE |
210 | network,secnetaddr,(char *)0); |
211 | break; | |
212 | case TUN_CONFIG_IOCTL: | |
213 | { | |
ea7ec970 SE |
214 | /* darwin rtentry has a different format, use /sbin/route instead */ |
215 | #if HAVE_NET_ROUTE_H && ! __APPLE__ | |
ff05a229 SE |
216 | struct rtentry rt; |
217 | struct sockaddr_in *sa; | |
218 | int action; | |
219 | ||
076bb54e | 220 | FILLZERO(rt); |
ff05a229 SE |
221 | sa=(struct sockaddr_in *)&rt.rt_dst; |
222 | sa->sin_family=AF_INET; | |
223 | sa->sin_addr.s_addr=htonl(nets->list[i].prefix); | |
224 | sa=(struct sockaddr_in *)&rt.rt_genmask; | |
225 | sa->sin_family=AF_INET; | |
226 | sa->sin_addr.s_addr=htonl(nets->list[i].mask); | |
227 | sa=(struct sockaddr_in *)&rt.rt_gateway; | |
228 | sa->sin_family=AF_INET; | |
229 | sa->sin_addr.s_addr=htonl(st->nl.secnet_address); | |
230 | rt.rt_flags=RTF_UP|RTF_GATEWAY; | |
efacf9e0 | 231 | action=up?SIOCADDRT:SIOCDELRT; |
ff05a229 SE |
232 | if (ioctl(fd,action,&rt)<0) { |
233 | fatal_perror("tun_set_route: ioctl()"); | |
234 | } | |
235 | #else | |
4f5e39ec | 236 | fatal("tun_set_route: ioctl method not supported"); |
ff05a229 | 237 | #endif |
d3fe100d | 238 | } |
ff05a229 SE |
239 | break; |
240 | default: | |
4f5e39ec | 241 | fatal("tun_set_route: unsupported route command type"); |
ff05a229 SE |
242 | break; |
243 | } | |
ff05a229 | 244 | } |
56fd04e4 | 245 | if (fd >= 0) { |
ff05a229 | 246 | close(fd); |
9d3a4132 | 247 | } |
efacf9e0 | 248 | routes->kup=up; |
ff05a229 | 249 | return True; |
9d3a4132 SE |
250 | } |
251 | ||
252 | static void tun_phase_hook(void *sst, uint32_t newphase) | |
253 | { | |
254 | struct tun *st=sst; | |
255 | string_t hostaddr,secnetaddr; | |
7c006408 | 256 | char mtu[6]; |
d3fe100d | 257 | struct netlink_client *r; |
9d3a4132 | 258 | |
ff05a229 | 259 | if (st->tun_flavour==TUN_FLAVOUR_BSD) { |
9d3a4132 SE |
260 | if (st->search_for_if) { |
261 | string_t dname; | |
262 | int i; | |
263 | ||
9d3a4132 SE |
264 | dname=safe_malloc(strlen(st->device_path)+4,"tun_old_apply"); |
265 | st->interface_name=safe_malloc(8,"tun_phase_hook"); | |
266 | ||
267 | for (i=0; i<255; i++) { | |
268 | sprintf(dname,"%s%d",st->device_path,i); | |
269 | if ((st->fd=open(dname,O_RDWR))>0) { | |
270 | sprintf(st->interface_name,"tun%d",i); | |
271 | Message(M_INFO,"%s: allocated network interface %s " | |
272 | "through %s\n",st->nl.name,st->interface_name, | |
273 | dname); | |
274 | break; | |
275 | } | |
276 | } | |
277 | if (st->fd==-1) { | |
4f5e39ec | 278 | fatal("%s: unable to open any TUN device (%s...)", |
9d3a4132 SE |
279 | st->nl.name,st->device_path); |
280 | } | |
281 | } else { | |
282 | st->fd=open(st->device_path,O_RDWR); | |
283 | if (st->fd==-1) { | |
284 | fatal_perror("%s: unable to open TUN device file %s", | |
285 | st->nl.name,st->device_path); | |
286 | } | |
287 | } | |
ff05a229 SE |
288 | } else if (st->tun_flavour==TUN_FLAVOUR_LINUX) { |
289 | #ifdef LINUX_TUN_SUPPORTED | |
9d3a4132 SE |
290 | struct ifreq ifr; |
291 | ||
292 | /* New TUN interface: open the device, then do ioctl TUNSETIFF | |
293 | to set or find out the network interface name. */ | |
294 | st->fd=open(st->device_path,O_RDWR); | |
295 | if (st->fd==-1) { | |
296 | fatal_perror("%s: can't open device file %s",st->nl.name, | |
297 | st->device_path); | |
298 | } | |
076bb54e | 299 | FILLZERO(ifr); |
9d3a4132 SE |
300 | ifr.ifr_flags = IFF_TUN | IFF_NO_PI; /* Just send/receive IP packets, |
301 | no extra headers */ | |
302 | if (st->interface_name) | |
303 | strncpy(ifr.ifr_name,st->interface_name,IFNAMSIZ); | |
9d3a4132 SE |
304 | if (ioctl(st->fd,TUNSETIFF,&ifr)<0) { |
305 | fatal_perror("%s: ioctl(TUNSETIFF)",st->nl.name); | |
306 | } | |
307 | if (!st->interface_name) { | |
308 | st->interface_name=safe_malloc(strlen(ifr.ifr_name)+1,"tun_apply"); | |
309 | strcpy(st->interface_name,ifr.ifr_name); | |
310 | Message(M_INFO,"%s: allocated network interface %s\n",st->nl.name, | |
311 | st->interface_name); | |
312 | } | |
313 | #else | |
4f5e39ec | 314 | fatal("tun_phase_hook: TUN_FLAVOUR_LINUX unexpected"); |
ff05a229 SE |
315 | #endif /* LINUX_TUN_SUPPORTED */ |
316 | } else if (st->tun_flavour==TUN_FLAVOUR_STREAMS) { | |
317 | #ifdef HAVE_TUN_STREAMS | |
318 | int tun_fd, if_fd, ppa=-1, ip_fd; | |
319 | ||
320 | if ((ip_fd=open(st->ip_path, O_RDWR)) < 0) { | |
321 | fatal_perror("%s: can't open %s",st->nl.name,st->ip_path); | |
322 | } | |
323 | if ((tun_fd=open(st->device_path,O_RDWR)) < 0) { | |
324 | fatal_perror("%s: can't open %s",st->nl.name,st->device_path); | |
325 | } | |
326 | if ((ppa=ioctl(tun_fd,TUNNEWPPA,ppa)) < 0) { | |
327 | fatal_perror("%s: can't assign new interface"); | |
328 | } | |
329 | if ((if_fd=open(st->device_path,O_RDWR)) < 0) { | |
330 | fatal_perror("%s: can't open %s (2)",st->nl.name,st->device_path); | |
331 | } | |
332 | if (ioctl(if_fd,I_PUSH,"ip") < 0) { | |
333 | fatal_perror("%s: can't push IP module",st->nl.name); | |
334 | } | |
335 | if (ioctl(if_fd,IF_UNITSEL,(char *)&ppa) < 0) { | |
336 | fatal_perror("%s: can't set ppa %d",st->nl.name,ppa); | |
337 | } | |
338 | if (ioctl(ip_fd, I_LINK, if_fd) < 0) { | |
339 | fatal_perror("%s: can't link TUN device to IP",st->nl.name); | |
340 | } | |
341 | st->interface_name=safe_malloc(10,"tun_apply"); | |
342 | sprintf(st->interface_name,"tun%d",ppa); | |
343 | st->fd=tun_fd; | |
4fb0f88d IJ |
344 | setcloexec(if_ifd); |
345 | setcloexec(ip_ifd); | |
ff05a229 | 346 | #else |
4f5e39ec | 347 | fatal("tun_phase_hook: TUN_FLAVOUR_STREAMS unexpected"); |
ff05a229 SE |
348 | #endif /* HAVE_TUN_STREAMS */ |
349 | } else { | |
4f5e39ec | 350 | fatal("tun_phase_hook: unknown flavour of TUN"); |
9d3a4132 SE |
351 | } |
352 | /* All the networks we'll be using have been registered. Invoke ifconfig | |
353 | to set the TUN device's address, and route to add routes to all | |
354 | our networks. */ | |
355 | ||
4fb0f88d | 356 | setcloexec(st->fd); |
ba703386 | 357 | setnonblock(st->fd); |
4fb0f88d | 358 | |
091433c6 | 359 | hostaddr=ipaddr_to_string(st->nl.local_address); |
9d3a4132 | 360 | secnetaddr=ipaddr_to_string(st->nl.secnet_address); |
c1d2109a | 361 | snprintf(mtu,sizeof(mtu),"%d",st->nl.mtu); |
9d3a4132 SE |
362 | mtu[5]=0; |
363 | ||
fe5e9cc4 | 364 | switch (st->ifconfig_type) { |
ff05a229 SE |
365 | case TUN_CONFIG_LINUX: |
366 | sys_cmd(st->ifconfig_path,"ifconfig",st->interface_name, | |
367 | hostaddr,"netmask","255.255.255.255","-broadcast", | |
368 | "-multicast", | |
369 | "pointopoint",secnetaddr,"mtu",mtu,"up",(char *)0); | |
370 | break; | |
371 | case TUN_CONFIG_BSD: | |
372 | sys_cmd(st->ifconfig_path,"ifconfig",st->interface_name, | |
373 | hostaddr,"netmask","255.255.255.255", | |
374 | secnetaddr,"mtu",mtu,"up",(char *)0); | |
375 | break; | |
376 | case TUN_CONFIG_SOLARIS25: | |
377 | sys_cmd(st->ifconfig_path,"ifconfig",st->interface_name, | |
378 | hostaddr,secnetaddr,"mtu",mtu,"up",(char *)0); | |
379 | break; | |
380 | case TUN_CONFIG_IOCTL: | |
ea7ec970 | 381 | #if HAVE_NET_IF_H && ! __APPLE__ |
ff05a229 SE |
382 | { |
383 | int fd; | |
384 | struct ifreq ifr; | |
385 | struct sockaddr_in *sa; | |
386 | fd=socket(PF_INET, SOCK_DGRAM, IPPROTO_IP); | |
387 | ||
388 | /* Interface address */ | |
389 | strncpy(ifr.ifr_name,st->interface_name,IFNAMSIZ); | |
390 | sa=(struct sockaddr_in *)&ifr.ifr_addr; | |
076bb54e | 391 | FILLZERO(*sa); |
ff05a229 | 392 | sa->sin_family=AF_INET; |
091433c6 | 393 | sa->sin_addr.s_addr=htonl(st->nl.local_address); |
ff05a229 SE |
394 | if (ioctl(fd,SIOCSIFADDR, &ifr)!=0) { |
395 | fatal_perror("tun_apply: SIOCSIFADDR"); | |
396 | } | |
397 | #ifdef SIOCSIFNETMASK | |
398 | /* Netmask */ | |
399 | strncpy(ifr.ifr_name,st->interface_name,IFNAMSIZ); | |
400 | sa=(struct sockaddr_in *)&ifr.ifr_netmask; | |
076bb54e | 401 | FILLZERO(*sa); |
ff05a229 SE |
402 | sa->sin_family=AF_INET; |
403 | sa->sin_addr.s_addr=htonl(0xffffffff); | |
404 | if (ioctl(fd,SIOCSIFNETMASK, &ifr)!=0) { | |
405 | fatal_perror("tun_apply: SIOCSIFNETMASK"); | |
406 | } | |
407 | #endif | |
408 | /* Destination address (point-to-point) */ | |
409 | strncpy(ifr.ifr_name,st->interface_name,IFNAMSIZ); | |
410 | sa=(struct sockaddr_in *)&ifr.ifr_dstaddr; | |
076bb54e | 411 | FILLZERO(*sa); |
ff05a229 SE |
412 | sa->sin_family=AF_INET; |
413 | sa->sin_addr.s_addr=htonl(st->nl.secnet_address); | |
414 | if (ioctl(fd,SIOCSIFDSTADDR, &ifr)!=0) { | |
415 | fatal_perror("tun_apply: SIOCSIFDSTADDR"); | |
416 | } | |
417 | /* MTU */ | |
418 | strncpy(ifr.ifr_name,st->interface_name,IFNAMSIZ); | |
419 | ifr.ifr_mtu=st->nl.mtu; | |
420 | if (ioctl(fd,SIOCSIFMTU, &ifr)!=0) { | |
421 | fatal_perror("tun_apply: SIOCSIFMTU"); | |
422 | } | |
423 | /* Flags */ | |
424 | strncpy(ifr.ifr_name,st->interface_name,IFNAMSIZ); | |
425 | ifr.ifr_flags=IFF_UP|IFF_POINTOPOINT|IFF_RUNNING|IFF_NOARP; | |
426 | if (ioctl(fd,SIOCSIFFLAGS, &ifr)!=0) { | |
427 | fatal_perror("tun_apply: SIOCSIFFLAGS"); | |
428 | } | |
9d3a4132 | 429 | |
ff05a229 SE |
430 | close(fd); |
431 | } | |
432 | #else | |
4f5e39ec | 433 | fatal("tun_apply: ifconfig by ioctl() not supported"); |
ff05a229 SE |
434 | #endif /* HAVE_NET_IF_H */ |
435 | break; | |
436 | default: | |
4f5e39ec | 437 | fatal("tun_apply: unsupported ifconfig method"); |
ff05a229 SE |
438 | break; |
439 | } | |
440 | ||
d3fe100d SE |
441 | for (r=st->nl.clients; r; r=r->next) { |
442 | tun_set_route(st,r); | |
9d3a4132 SE |
443 | } |
444 | ||
32654a31 IJ |
445 | add_hook(PHASE_CHILDPERSIST,childpersist_closefd_hook,&st->fd); |
446 | ||
9d3a4132 | 447 | /* Register for poll() */ |
32fc582f | 448 | register_for_poll(st, tun_beforepoll, tun_afterpoll, st->nl.name); |
9d3a4132 SE |
449 | } |
450 | ||
ff05a229 SE |
451 | static list_t *tun_create(closure_t *self, struct cloc loc, dict_t *context, |
452 | list_t *args,uint32_t default_flavour) | |
9d3a4132 SE |
453 | { |
454 | struct tun *st; | |
455 | item_t *item; | |
456 | dict_t *dict; | |
ff05a229 | 457 | string_t flavour,type; |
9d3a4132 | 458 | |
b7886fd4 | 459 | NEW(st); |
9d3a4132 SE |
460 | |
461 | /* First parameter must be a dict */ | |
462 | item=list_elem(args,0); | |
463 | if (!item || item->type!=t_dict) | |
464 | cfgfatal(loc,"tun","parameter must be a dictionary\n"); | |
465 | ||
466 | dict=item->data.dict; | |
467 | ||
468 | st->netlink_to_tunnel= | |
469 | netlink_init(&st->nl,st,loc,dict, | |
470 | "netlink-tun",tun_set_route,tun_deliver_to_kernel); | |
471 | ||
ff05a229 SE |
472 | flavour=dict_read_string(dict,"flavour",False,"tun-netlink",loc); |
473 | if (flavour) | |
474 | st->tun_flavour=string_to_word(flavour,loc,flavours,"tun-flavour"); | |
475 | else | |
476 | st->tun_flavour=default_flavour; | |
477 | ||
9d3a4132 | 478 | st->device_path=dict_read_string(dict,"device",False,"tun-netlink",loc); |
ff05a229 | 479 | st->ip_path=dict_read_string(dict,"ip-path",False,"tun-netlink",loc); |
9d3a4132 SE |
480 | st->interface_name=dict_read_string(dict,"interface",False, |
481 | "tun-netlink",loc); | |
ff05a229 SE |
482 | st->search_for_if=dict_read_bool(dict,"interface-search",False, |
483 | "tun-netlink",loc,st->device_path==NULL); | |
484 | ||
485 | type=dict_read_string(dict,"ifconfig-type",False,"tun-netlink",loc); | |
486 | if (type) st->ifconfig_type=string_to_word(type,loc,config_types, | |
487 | "ifconfig-type"); | |
488 | else st->ifconfig_type=TUN_CONFIG_GUESS; | |
489 | st->ifconfig_path=dict_read_string(dict,"ifconfig-path",False, | |
490 | "tun-netlink",loc); | |
491 | ||
492 | type=dict_read_string(dict,"route-type",False,"tun-netlink",loc); | |
493 | if (type) st->route_type=string_to_word(type,loc,config_types, | |
494 | "route-type"); | |
495 | else st->route_type=TUN_CONFIG_GUESS; | |
496 | st->route_path=dict_read_string(dict,"route-path",False,"tun-netlink",loc); | |
9d3a4132 | 497 | |
9d3a4132 SE |
498 | st->buff=find_cl_if(dict,"buffer",CL_BUFFER,True,"tun-netlink",loc); |
499 | ||
ff05a229 SE |
500 | if (st->tun_flavour==TUN_FLAVOUR_GUESS) { |
501 | /* If we haven't been told what type of TUN we're using, take | |
502 | a guess based on the system details. */ | |
503 | struct utsname u; | |
504 | if (uname(&u)<0) { | |
505 | fatal_perror("tun_create: uname"); | |
506 | } | |
507 | if (strcmp(u.sysname,"Linux")==0) { | |
621c2861 | 508 | st->tun_flavour=TUN_FLAVOUR_LINUX; |
ff05a229 SE |
509 | } else if (strcmp(u.sysname,"SunOS")==0) { |
510 | st->tun_flavour=TUN_FLAVOUR_STREAMS; | |
ea7ec970 SE |
511 | } else if (strcmp(u.sysname,"FreeBSD")==0 |
512 | || strcmp(u.sysname,"Darwin")==0) { | |
ff05a229 SE |
513 | st->tun_flavour=TUN_FLAVOUR_BSD; |
514 | } | |
515 | } | |
516 | if (st->tun_flavour==TUN_FLAVOUR_GUESS) { | |
517 | cfgfatal(loc,"tun","cannot guess which type of TUN is in use; " | |
518 | "specify the flavour explicitly\n"); | |
519 | } | |
9d3a4132 | 520 | |
ff05a229 SE |
521 | if (st->ifconfig_type==TUN_CONFIG_GUESS) { |
522 | switch (st->tun_flavour) { | |
523 | case TUN_FLAVOUR_LINUX: | |
524 | st->ifconfig_type=TUN_CONFIG_IOCTL; | |
525 | break; | |
526 | case TUN_FLAVOUR_BSD: | |
ea7ec970 | 527 | #if __linux__ |
4f5e39ec SE |
528 | /* XXX on Linux we still want TUN_CONFIG_IOCTL. Perhaps we can |
529 | use this on BSD too. */ | |
530 | st->ifconfig_type=TUN_CONFIG_IOCTL; | |
ea7ec970 SE |
531 | #else |
532 | st->ifconfig_type=TUN_CONFIG_BSD; | |
533 | #endif | |
ff05a229 SE |
534 | break; |
535 | case TUN_FLAVOUR_STREAMS: | |
536 | st->ifconfig_type=TUN_CONFIG_BSD; | |
537 | break; | |
538 | } | |
539 | } | |
540 | if (st->route_type==TUN_CONFIG_GUESS) | |
541 | st->route_type=st->ifconfig_type; | |
9d3a4132 | 542 | |
ff05a229 SE |
543 | if (st->ifconfig_type==TUN_CONFIG_GUESS) { |
544 | cfgfatal(loc,"tun","cannot guess which ifconfig method to use\n"); | |
545 | } | |
546 | if (st->route_type==TUN_CONFIG_GUESS) { | |
547 | cfgfatal(loc,"tun","cannot guess which route method to use\n"); | |
548 | } | |
9d3a4132 | 549 | |
ff05a229 SE |
550 | if (st->ifconfig_type==TUN_CONFIG_IOCTL && st->ifconfig_path) { |
551 | cfgfatal(loc,"tun","ifconfig-type \"ioctl\" is incompatible with " | |
552 | "ifconfig-path\n"); | |
553 | } | |
554 | if (st->route_type==TUN_CONFIG_IOCTL && st->route_path) { | |
555 | cfgfatal(loc,"tun","route-type \"ioctl\" is incompatible with " | |
556 | "route-path\n"); | |
557 | } | |
9d3a4132 | 558 | |
ff05a229 SE |
559 | Message(M_DEBUG_CONFIG,"%s: tun flavour %s\n",st->nl.name, |
560 | tun_flavour_str(st->tun_flavour)); | |
561 | switch (st->tun_flavour) { | |
562 | case TUN_FLAVOUR_BSD: | |
563 | if (!st->device_path) st->device_path="/dev/tun"; | |
564 | break; | |
565 | case TUN_FLAVOUR_LINUX: | |
566 | if (!st->device_path) st->device_path="/dev/net/tun"; | |
567 | break; | |
568 | case TUN_FLAVOUR_STREAMS: | |
569 | if (!st->device_path) st->device_path="/dev/tun"; | |
570 | if (st->interface_name) cfgfatal(loc,"tun","interface name cannot " | |
571 | "be specified with STREAMS TUN\n"); | |
572 | break; | |
573 | } | |
9d3a4132 | 574 | |
ff05a229 | 575 | if (!st->ip_path) st->ip_path="/dev/ip"; |
9d3a4132 SE |
576 | if (!st->ifconfig_path) st->ifconfig_path="ifconfig"; |
577 | if (!st->route_path) st->route_path="route"; | |
ff05a229 SE |
578 | |
579 | #ifndef HAVE_TUN_STREAMS | |
580 | if (st->tun_flavour==TUN_FLAVOUR_STREAMS) { | |
581 | cfgfatal(loc,"tun","TUN flavour STREAMS unsupported in this build " | |
582 | "of secnet\n"); | |
583 | } | |
584 | #endif | |
585 | #ifndef LINUX_TUN_SUPPORTED | |
586 | if (st->tun_flavour==TUN_FLAVOUR_LINUX) { | |
587 | cfgfatal(loc,"tun","TUN flavour LINUX unsupported in this build " | |
588 | "of secnet\n"); | |
589 | } | |
590 | #endif | |
9d3a4132 SE |
591 | |
592 | /* Old TUN interface: the network interface name depends on which | |
593 | /dev/tunX file we open. If 'interface-search' is set to true, treat | |
594 | 'device' as the prefix and try numbers from 0--255. If it's set | |
595 | to false, treat 'device' as the whole name, and require than an | |
596 | appropriate interface name be specified. */ | |
ff05a229 SE |
597 | if (st->tun_flavour==TUN_FLAVOUR_BSD) { |
598 | if (st->search_for_if && st->interface_name) { | |
599 | cfgfatal(loc,"tun","you may not specify an interface name " | |
600 | "in interface-search mode\n"); | |
601 | } | |
602 | if (!st->search_for_if && !st->interface_name) { | |
603 | cfgfatal(loc,"tun","you must specify an interface name " | |
604 | "when you explicitly specify a TUN device file\n"); | |
605 | } | |
9d3a4132 SE |
606 | } |
607 | ||
9d3a4132 SE |
608 | add_hook(PHASE_GETRESOURCES,tun_phase_hook,st); |
609 | ||
610 | return new_closure(&st->nl.cl); | |
611 | } | |
612 | ||
ff05a229 SE |
613 | static list_t *tun_apply(closure_t *self, struct cloc loc, dict_t *context, |
614 | list_t *args) | |
615 | { | |
616 | return tun_create(self,loc,context,args,TUN_FLAVOUR_GUESS); | |
617 | } | |
618 | ||
619 | static list_t *tun_bsd_apply(closure_t *self, struct cloc loc, dict_t *context, | |
620 | list_t *args) | |
621 | { | |
622 | Message(M_WARNING,"(%s,%d): obsolete use of tun-old; replace with tun " | |
623 | "and specify flavour \"bsd\".\n",loc.file,loc.line); | |
624 | return tun_create(self,loc,context,args,TUN_FLAVOUR_BSD); | |
625 | } | |
626 | ||
9d3a4132 SE |
627 | void tun_module(dict_t *dict) |
628 | { | |
9d3a4132 | 629 | add_closure(dict,"tun",tun_apply); |
ff05a229 | 630 | add_closure(dict,"tun-old",tun_bsd_apply); |
9d3a4132 | 631 | } |