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8429abe0 RW |
1 | /* $OpenBSD$ */ |
2 | ||
3 | /* | |
4 | * Copyright (c) 2016 Renato Westphal <renato@openbsd.org> | |
5 | * Copyright (c) 2009 Michele Marchetto <michele@openbsd.org> | |
6 | * Copyright (c) 2005 Claudio Jeker <claudio@openbsd.org> | |
7 | * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org> | |
8 | * | |
9 | * Permission to use, copy, modify, and distribute this software for any | |
10 | * purpose with or without fee is hereby granted, provided that the above | |
11 | * copyright notice and this permission notice appear in all copies. | |
12 | * | |
13 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES | |
14 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | |
15 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR | |
16 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
17 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
18 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
19 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
20 | */ | |
21 | ||
eac6e3f0 | 22 | #include <zebra.h> |
8429abe0 RW |
23 | |
24 | #include "ldpd.h" | |
25 | #include "ldpe.h" | |
26 | #include "log.h" | |
27 | ||
eac6e3f0 RW |
28 | #include "lib/log.h" |
29 | #include "privs.h" | |
30 | #include "sockopt.h" | |
31 | ||
32 | extern struct zebra_privs_t ldpd_privs; | |
33 | extern struct zebra_privs_t ldpe_privs; | |
34 | ||
8429abe0 RW |
35 | int |
36 | ldp_create_socket(int af, enum socket_type type) | |
37 | { | |
38 | int fd, domain, proto; | |
39 | union ldpd_addr addr; | |
4149ef7c | 40 | union sockunion local_su; |
eac6e3f0 | 41 | #ifdef __OpenBSD__ |
8429abe0 | 42 | int opt; |
eac6e3f0 RW |
43 | #endif |
44 | int save_errno; | |
8429abe0 RW |
45 | |
46 | /* create socket */ | |
47 | switch (type) { | |
48 | case LDP_SOCKET_DISC: | |
49 | case LDP_SOCKET_EDISC: | |
50 | domain = SOCK_DGRAM; | |
51 | proto = IPPROTO_UDP; | |
52 | break; | |
53 | case LDP_SOCKET_SESSION: | |
54 | domain = SOCK_STREAM; | |
55 | proto = IPPROTO_TCP; | |
56 | break; | |
57 | default: | |
58 | fatalx("ldp_create_socket: unknown socket type"); | |
59 | } | |
eac6e3f0 | 60 | fd = socket(af, domain, proto); |
8429abe0 RW |
61 | if (fd == -1) { |
62 | log_warn("%s: error creating socket", __func__); | |
63 | return (-1); | |
64 | } | |
eac6e3f0 RW |
65 | sock_set_nonblock(fd); |
66 | sockopt_v6only(af, fd); | |
8429abe0 RW |
67 | |
68 | /* bind to a local address/port */ | |
69 | switch (type) { | |
70 | case LDP_SOCKET_DISC: | |
71 | /* listen on all addresses */ | |
72 | memset(&addr, 0, sizeof(addr)); | |
4149ef7c | 73 | addr2sa(af, &addr, LDP_PORT, &local_su); |
8429abe0 RW |
74 | break; |
75 | case LDP_SOCKET_EDISC: | |
76 | case LDP_SOCKET_SESSION: | |
77 | addr = (ldp_af_conf_get(ldpd_conf, af))->trans_addr; | |
4149ef7c | 78 | addr2sa(af, &addr, LDP_PORT, &local_su); |
eac6e3f0 RW |
79 | /* ignore any possible error */ |
80 | sock_set_bindany(fd, 1); | |
8429abe0 RW |
81 | break; |
82 | } | |
eac6e3f0 RW |
83 | if (ldpd_privs.change(ZPRIVS_RAISE)) |
84 | log_warn("%s: could not raise privs", __func__); | |
8429abe0 | 85 | if (sock_set_reuse(fd, 1) == -1) { |
07bc3833 RW |
86 | if (ldpd_privs.change(ZPRIVS_LOWER)) |
87 | log_warn("%s: could not lower privs", __func__); | |
8429abe0 RW |
88 | close(fd); |
89 | return (-1); | |
90 | } | |
4149ef7c | 91 | if (bind(fd, &local_su.sa, sockaddr_len(&local_su.sa)) == -1) { |
eac6e3f0 RW |
92 | save_errno = errno; |
93 | if (ldpd_privs.change(ZPRIVS_LOWER)) | |
94 | log_warn("%s: could not lower privs", __func__); | |
95 | log_warnx("%s: error binding socket: %s", __func__, | |
96 | safe_strerror(save_errno)); | |
8429abe0 RW |
97 | close(fd); |
98 | return (-1); | |
99 | } | |
eac6e3f0 RW |
100 | if (ldpd_privs.change(ZPRIVS_LOWER)) |
101 | log_warn("%s: could not lower privs", __func__); | |
8429abe0 RW |
102 | |
103 | /* set options */ | |
104 | switch (af) { | |
105 | case AF_INET: | |
106 | if (sock_set_ipv4_tos(fd, IPTOS_PREC_INTERNETCONTROL) == -1) { | |
107 | close(fd); | |
108 | return (-1); | |
109 | } | |
110 | if (type == LDP_SOCKET_DISC) { | |
111 | if (sock_set_ipv4_mcast_ttl(fd, | |
112 | IP_DEFAULT_MULTICAST_TTL) == -1) { | |
113 | close(fd); | |
114 | return (-1); | |
115 | } | |
116 | if (sock_set_ipv4_mcast_loop(fd) == -1) { | |
117 | close(fd); | |
118 | return (-1); | |
119 | } | |
120 | } | |
121 | if (type == LDP_SOCKET_DISC || type == LDP_SOCKET_EDISC) { | |
122 | if (sock_set_ipv4_recvif(fd, 1) == -1) { | |
123 | close(fd); | |
124 | return (-1); | |
125 | } | |
eac6e3f0 RW |
126 | #ifndef MSG_MCAST |
127 | #if defined(HAVE_IP_PKTINFO) | |
128 | if (sock_set_ipv4_pktinfo(fd, 1) == -1) { | |
129 | close(fd); | |
130 | return (-1); | |
131 | } | |
132 | #elif defined(HAVE_IP_RECVDSTADDR) | |
133 | if (sock_set_ipv4_recvdstaddr(fd, 1) == -1) { | |
134 | close(fd); | |
135 | return (-1); | |
136 | } | |
137 | #else | |
138 | #error "Unsupported socket API" | |
139 | #endif | |
140 | #endif /* MSG_MCAST */ | |
8429abe0 RW |
141 | } |
142 | if (type == LDP_SOCKET_SESSION) { | |
143 | if (sock_set_ipv4_ucast_ttl(fd, 255) == -1) { | |
144 | close(fd); | |
145 | return (-1); | |
146 | } | |
147 | } | |
148 | break; | |
149 | case AF_INET6: | |
150 | if (sock_set_ipv6_dscp(fd, IPTOS_PREC_INTERNETCONTROL) == -1) { | |
151 | close(fd); | |
152 | return (-1); | |
153 | } | |
154 | if (type == LDP_SOCKET_DISC) { | |
155 | if (sock_set_ipv6_mcast_loop(fd) == -1) { | |
156 | close(fd); | |
157 | return (-1); | |
158 | } | |
159 | if (sock_set_ipv6_mcast_hops(fd, 255) == -1) { | |
160 | close(fd); | |
161 | return (-1); | |
162 | } | |
163 | if (!(ldpd_conf->ipv6.flags & F_LDPD_AF_NO_GTSM)) { | |
eac6e3f0 RW |
164 | /* ignore any possible error */ |
165 | sock_set_ipv6_minhopcount(fd, 255); | |
8429abe0 RW |
166 | } |
167 | } | |
168 | if (type == LDP_SOCKET_DISC || type == LDP_SOCKET_EDISC) { | |
169 | if (sock_set_ipv6_pktinfo(fd, 1) == -1) { | |
170 | close(fd); | |
171 | return (-1); | |
172 | } | |
173 | } | |
174 | if (type == LDP_SOCKET_SESSION) { | |
175 | if (sock_set_ipv6_ucast_hops(fd, 255) == -1) { | |
176 | close(fd); | |
177 | return (-1); | |
178 | } | |
179 | } | |
180 | break; | |
181 | } | |
182 | switch (type) { | |
183 | case LDP_SOCKET_DISC: | |
184 | case LDP_SOCKET_EDISC: | |
185 | sock_set_recvbuf(fd); | |
186 | break; | |
187 | case LDP_SOCKET_SESSION: | |
188 | if (listen(fd, LDP_BACKLOG) == -1) | |
189 | log_warn("%s: error listening on socket", __func__); | |
190 | ||
eac6e3f0 | 191 | #ifdef __OpenBSD__ |
8429abe0 RW |
192 | opt = 1; |
193 | if (setsockopt(fd, IPPROTO_TCP, TCP_MD5SIG, &opt, | |
194 | sizeof(opt)) == -1) { | |
195 | if (errno == ENOPROTOOPT) { /* system w/o md5sig */ | |
196 | log_warnx("md5sig not available, disabling"); | |
197 | sysdep.no_md5sig = 1; | |
198 | } else { | |
199 | close(fd); | |
200 | return (-1); | |
201 | } | |
202 | } | |
eac6e3f0 | 203 | #endif |
8429abe0 RW |
204 | break; |
205 | } | |
206 | ||
207 | return (fd); | |
208 | } | |
209 | ||
eac6e3f0 RW |
210 | void |
211 | sock_set_nonblock(int fd) | |
212 | { | |
213 | int flags; | |
214 | ||
215 | if ((flags = fcntl(fd, F_GETFL, 0)) == -1) | |
216 | fatal("fcntl F_GETFL"); | |
217 | ||
218 | flags |= O_NONBLOCK; | |
219 | ||
220 | if ((flags = fcntl(fd, F_SETFL, flags)) == -1) | |
221 | fatal("fcntl F_SETFL"); | |
222 | } | |
223 | ||
224 | void | |
225 | sock_set_cloexec(int fd) | |
226 | { | |
227 | int flags; | |
228 | ||
229 | if ((flags = fcntl(fd, F_GETFD, 0)) == -1) | |
230 | fatal("fcntl F_GETFD"); | |
231 | ||
232 | flags |= FD_CLOEXEC; | |
233 | ||
234 | if ((flags = fcntl(fd, F_SETFD, flags)) == -1) | |
235 | fatal("fcntl F_SETFD"); | |
236 | } | |
237 | ||
8429abe0 RW |
238 | void |
239 | sock_set_recvbuf(int fd) | |
240 | { | |
241 | int bsize; | |
242 | ||
243 | bsize = 65535; | |
244 | while (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &bsize, | |
245 | sizeof(bsize)) == -1) | |
246 | bsize /= 2; | |
247 | } | |
248 | ||
249 | int | |
250 | sock_set_reuse(int fd, int enable) | |
251 | { | |
252 | if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &enable, | |
253 | sizeof(int)) < 0) { | |
254 | log_warn("%s: error setting SO_REUSEADDR", __func__); | |
255 | return (-1); | |
256 | } | |
257 | ||
258 | return (0); | |
259 | } | |
260 | ||
261 | int | |
262 | sock_set_bindany(int fd, int enable) | |
263 | { | |
eac6e3f0 RW |
264 | #ifdef HAVE_SO_BINDANY |
265 | if (ldpd_privs.change(ZPRIVS_RAISE)) | |
266 | log_warn("%s: could not raise privs", __func__); | |
8429abe0 RW |
267 | if (setsockopt(fd, SOL_SOCKET, SO_BINDANY, &enable, |
268 | sizeof(int)) < 0) { | |
eac6e3f0 RW |
269 | if (ldpd_privs.change(ZPRIVS_LOWER)) |
270 | log_warn("%s: could not lower privs", __func__); | |
8429abe0 RW |
271 | log_warn("%s: error setting SO_BINDANY", __func__); |
272 | return (-1); | |
273 | } | |
eac6e3f0 RW |
274 | if (ldpd_privs.change(ZPRIVS_LOWER)) |
275 | log_warn("%s: could not lower privs", __func__); | |
276 | return (0); | |
277 | #elif defined(HAVE_IP_FREEBIND) | |
278 | if (setsockopt(fd, IPPROTO_IP, IP_FREEBIND, &enable, sizeof(int)) < 0) { | |
279 | log_warn("%s: error setting IP_FREEBIND", __func__); | |
280 | return (-1); | |
281 | } | |
8429abe0 | 282 | return (0); |
eac6e3f0 RW |
283 | #else |
284 | log_warnx("%s: missing SO_BINDANY and IP_FREEBIND, unable to bind " | |
285 | "to a nonlocal IP address", __func__); | |
286 | return (-1); | |
287 | #endif /* HAVE_SO_BINDANY */ | |
288 | } | |
289 | ||
290 | #ifndef __OpenBSD__ | |
291 | /* | |
292 | * Set MD5 key for the socket, for the given peer address. If the password | |
293 | * is NULL or zero-length, the option will be disabled. | |
294 | */ | |
295 | int | |
296 | sock_set_md5sig(int fd, int af, union ldpd_addr *addr, const char *password) | |
297 | { | |
298 | int ret = -1; | |
299 | int save_errno = ENOSYS; | |
300 | #if HAVE_DECL_TCP_MD5SIG | |
301 | union sockunion su; | |
302 | #endif | |
303 | ||
304 | if (fd == -1) | |
305 | return (0); | |
306 | #if HAVE_DECL_TCP_MD5SIG | |
4149ef7c | 307 | addr2sa(af, addr, 0, &su); |
eac6e3f0 RW |
308 | |
309 | if (ldpe_privs.change(ZPRIVS_RAISE)) { | |
310 | log_warn("%s: could not raise privs", __func__); | |
311 | return (-1); | |
312 | } | |
313 | ret = sockopt_tcp_signature(fd, &su, password); | |
314 | save_errno = errno; | |
315 | if (ldpe_privs.change(ZPRIVS_LOWER)) | |
316 | log_warn("%s: could not lower privs", __func__); | |
317 | #endif /* HAVE_TCP_MD5SIG */ | |
318 | if (ret < 0) | |
319 | log_warnx("%s: can't set TCP_MD5SIG option on fd %d: %s", | |
320 | __func__, fd, safe_strerror(save_errno)); | |
321 | ||
322 | return (ret); | |
8429abe0 | 323 | } |
eac6e3f0 | 324 | #endif |
8429abe0 RW |
325 | |
326 | int | |
327 | sock_set_ipv4_tos(int fd, int tos) | |
328 | { | |
329 | if (setsockopt(fd, IPPROTO_IP, IP_TOS, (int *)&tos, sizeof(tos)) < 0) { | |
330 | log_warn("%s: error setting IP_TOS to 0x%x", __func__, tos); | |
331 | return (-1); | |
332 | } | |
333 | ||
334 | return (0); | |
335 | } | |
336 | ||
337 | int | |
338 | sock_set_ipv4_recvif(int fd, int enable) | |
339 | { | |
eac6e3f0 | 340 | return (setsockopt_ifindex(AF_INET, fd, enable)); |
8429abe0 RW |
341 | } |
342 | ||
343 | int | |
344 | sock_set_ipv4_minttl(int fd, int ttl) | |
345 | { | |
eac6e3f0 | 346 | return (sockopt_minttl(AF_INET, fd, ttl)); |
8429abe0 RW |
347 | } |
348 | ||
349 | int | |
350 | sock_set_ipv4_ucast_ttl(int fd, int ttl) | |
351 | { | |
352 | if (setsockopt(fd, IPPROTO_IP, IP_TTL, &ttl, sizeof(ttl)) < 0) { | |
353 | log_warn("%s: error setting IP_TTL", __func__); | |
354 | return (-1); | |
355 | } | |
356 | ||
357 | return (0); | |
358 | } | |
359 | ||
360 | int | |
361 | sock_set_ipv4_mcast_ttl(int fd, uint8_t ttl) | |
362 | { | |
363 | if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_TTL, | |
364 | (char *)&ttl, sizeof(ttl)) < 0) { | |
365 | log_warn("%s: error setting IP_MULTICAST_TTL to %d", | |
366 | __func__, ttl); | |
367 | return (-1); | |
368 | } | |
369 | ||
370 | return (0); | |
371 | } | |
372 | ||
eac6e3f0 RW |
373 | #ifndef MSG_MCAST |
374 | #if defined(HAVE_IP_PKTINFO) | |
375 | int | |
376 | sock_set_ipv4_pktinfo(int fd, int enable) | |
377 | { | |
378 | if (setsockopt(fd, IPPROTO_IP, IP_PKTINFO, &enable, | |
379 | sizeof(enable)) < 0) { | |
380 | log_warn("%s: error setting IP_PKTINFO", __func__); | |
381 | return (-1); | |
382 | } | |
383 | ||
384 | return (0); | |
385 | } | |
386 | #elif defined(HAVE_IP_RECVDSTADDR) | |
387 | int | |
388 | sock_set_ipv4_recvdstaddr(int fd, int enable) | |
389 | { | |
390 | if (setsockopt(fd, IPPROTO_IP, IP_RECVDSTADDR, &enable, | |
391 | sizeof(enable)) < 0) { | |
392 | log_warn("%s: error setting IP_RECVDSTADDR", __func__); | |
393 | return (-1); | |
394 | } | |
395 | ||
396 | return (0); | |
397 | } | |
398 | #else | |
399 | #error "Unsupported socket API" | |
400 | #endif | |
401 | #endif /* MSG_MCAST */ | |
402 | ||
8429abe0 RW |
403 | int |
404 | sock_set_ipv4_mcast(struct iface *iface) | |
405 | { | |
eac6e3f0 | 406 | struct in_addr if_addr; |
8429abe0 | 407 | |
eac6e3f0 | 408 | if_addr.s_addr = if_get_ipv4_addr(iface); |
8429abe0 | 409 | |
eac6e3f0 RW |
410 | if (setsockopt_ipv4_multicast_if(global.ipv4.ldp_disc_socket, |
411 | if_addr, iface->ifindex) < 0) { | |
8429abe0 RW |
412 | log_warn("%s: error setting IP_MULTICAST_IF, interface %s", |
413 | __func__, iface->name); | |
414 | return (-1); | |
415 | } | |
416 | ||
417 | return (0); | |
418 | } | |
419 | ||
420 | int | |
421 | sock_set_ipv4_mcast_loop(int fd) | |
422 | { | |
c5bdb09f | 423 | return (setsockopt_ipv4_multicast_loop(fd, 0)); |
8429abe0 RW |
424 | } |
425 | ||
426 | int | |
427 | sock_set_ipv6_dscp(int fd, int dscp) | |
428 | { | |
429 | if (setsockopt(fd, IPPROTO_IPV6, IPV6_TCLASS, &dscp, | |
430 | sizeof(dscp)) < 0) { | |
431 | log_warn("%s: error setting IPV6_TCLASS", __func__); | |
432 | return (-1); | |
433 | } | |
434 | ||
435 | return (0); | |
436 | } | |
437 | ||
438 | int | |
439 | sock_set_ipv6_pktinfo(int fd, int enable) | |
440 | { | |
441 | if (setsockopt(fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &enable, | |
442 | sizeof(enable)) < 0) { | |
443 | log_warn("%s: error setting IPV6_RECVPKTINFO", __func__); | |
444 | return (-1); | |
445 | } | |
446 | ||
447 | return (0); | |
448 | } | |
449 | ||
450 | int | |
451 | sock_set_ipv6_minhopcount(int fd, int hoplimit) | |
452 | { | |
eac6e3f0 | 453 | return (sockopt_minttl(AF_INET6, fd, hoplimit)); |
8429abe0 RW |
454 | } |
455 | ||
456 | int | |
457 | sock_set_ipv6_ucast_hops(int fd, int hoplimit) | |
458 | { | |
459 | if (setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, | |
460 | &hoplimit, sizeof(hoplimit)) < 0) { | |
461 | log_warn("%s: error setting IPV6_UNICAST_HOPS", __func__); | |
462 | return (-1); | |
463 | } | |
464 | ||
465 | return (0); | |
466 | } | |
467 | ||
468 | int | |
469 | sock_set_ipv6_mcast_hops(int fd, int hoplimit) | |
470 | { | |
471 | if (setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, | |
472 | &hoplimit, sizeof(hoplimit)) < 0) { | |
473 | log_warn("%s: error setting IPV6_MULTICAST_HOPS", __func__); | |
474 | return (-1); | |
475 | } | |
476 | ||
477 | return (0); | |
478 | } | |
479 | ||
480 | int | |
481 | sock_set_ipv6_mcast(struct iface *iface) | |
482 | { | |
483 | if (setsockopt(global.ipv6.ldp_disc_socket, IPPROTO_IPV6, | |
484 | IPV6_MULTICAST_IF, &iface->ifindex, sizeof(iface->ifindex)) < 0) { | |
485 | log_warn("%s: error setting IPV6_MULTICAST_IF, interface %s", | |
486 | __func__, iface->name); | |
487 | return (-1); | |
488 | } | |
489 | ||
490 | return (0); | |
491 | } | |
492 | ||
493 | int | |
494 | sock_set_ipv6_mcast_loop(int fd) | |
495 | { | |
496 | unsigned int loop = 0; | |
497 | ||
498 | if (setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, | |
499 | &loop, sizeof(loop)) < 0) { | |
500 | log_warn("%s: error setting IPV6_MULTICAST_LOOP", __func__); | |
501 | return (-1); | |
502 | } | |
503 | ||
504 | return (0); | |
505 | } |