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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 | 43 | #endif |
8429abe0 RW |
44 | |
45 | /* create socket */ | |
46 | switch (type) { | |
47 | case LDP_SOCKET_DISC: | |
48 | case LDP_SOCKET_EDISC: | |
49 | domain = SOCK_DGRAM; | |
50 | proto = IPPROTO_UDP; | |
51 | break; | |
52 | case LDP_SOCKET_SESSION: | |
53 | domain = SOCK_STREAM; | |
54 | proto = IPPROTO_TCP; | |
55 | break; | |
56 | default: | |
57 | fatalx("ldp_create_socket: unknown socket type"); | |
58 | } | |
eac6e3f0 | 59 | fd = socket(af, domain, proto); |
8429abe0 RW |
60 | if (fd == -1) { |
61 | log_warn("%s: error creating socket", __func__); | |
62 | return (-1); | |
63 | } | |
eac6e3f0 RW |
64 | sock_set_nonblock(fd); |
65 | sockopt_v6only(af, fd); | |
8429abe0 RW |
66 | |
67 | /* bind to a local address/port */ | |
68 | switch (type) { | |
69 | case LDP_SOCKET_DISC: | |
70 | /* listen on all addresses */ | |
71 | memset(&addr, 0, sizeof(addr)); | |
4149ef7c | 72 | addr2sa(af, &addr, LDP_PORT, &local_su); |
8429abe0 RW |
73 | break; |
74 | case LDP_SOCKET_EDISC: | |
75 | case LDP_SOCKET_SESSION: | |
76 | addr = (ldp_af_conf_get(ldpd_conf, af))->trans_addr; | |
4149ef7c | 77 | addr2sa(af, &addr, LDP_PORT, &local_su); |
eac6e3f0 RW |
78 | /* ignore any possible error */ |
79 | sock_set_bindany(fd, 1); | |
8429abe0 RW |
80 | break; |
81 | } | |
6bb30c2c DL |
82 | frr_elevate_privs(&ldpd_privs) { |
83 | if (sock_set_reuse(fd, 1) == -1) { | |
84 | close(fd); | |
85 | return (-1); | |
86 | } | |
87 | if (bind(fd, &local_su.sa, sockaddr_len(&local_su.sa)) == -1) { | |
88 | log_warnx("%s: error binding socket: %s", __func__, | |
89 | safe_strerror(errno)); | |
90 | close(fd); | |
91 | return (-1); | |
92 | } | |
8429abe0 RW |
93 | } |
94 | ||
95 | /* set options */ | |
96 | switch (af) { | |
97 | case AF_INET: | |
98 | if (sock_set_ipv4_tos(fd, IPTOS_PREC_INTERNETCONTROL) == -1) { | |
99 | close(fd); | |
100 | return (-1); | |
101 | } | |
102 | if (type == LDP_SOCKET_DISC) { | |
103 | if (sock_set_ipv4_mcast_ttl(fd, | |
104 | IP_DEFAULT_MULTICAST_TTL) == -1) { | |
105 | close(fd); | |
106 | return (-1); | |
107 | } | |
108 | if (sock_set_ipv4_mcast_loop(fd) == -1) { | |
109 | close(fd); | |
110 | return (-1); | |
111 | } | |
112 | } | |
113 | if (type == LDP_SOCKET_DISC || type == LDP_SOCKET_EDISC) { | |
114 | if (sock_set_ipv4_recvif(fd, 1) == -1) { | |
115 | close(fd); | |
116 | return (-1); | |
117 | } | |
eac6e3f0 RW |
118 | #ifndef MSG_MCAST |
119 | #if defined(HAVE_IP_PKTINFO) | |
120 | if (sock_set_ipv4_pktinfo(fd, 1) == -1) { | |
121 | close(fd); | |
122 | return (-1); | |
123 | } | |
124 | #elif defined(HAVE_IP_RECVDSTADDR) | |
125 | if (sock_set_ipv4_recvdstaddr(fd, 1) == -1) { | |
126 | close(fd); | |
127 | return (-1); | |
128 | } | |
129 | #else | |
130 | #error "Unsupported socket API" | |
131 | #endif | |
132 | #endif /* MSG_MCAST */ | |
8429abe0 RW |
133 | } |
134 | if (type == LDP_SOCKET_SESSION) { | |
135 | if (sock_set_ipv4_ucast_ttl(fd, 255) == -1) { | |
136 | close(fd); | |
137 | return (-1); | |
138 | } | |
139 | } | |
140 | break; | |
141 | case AF_INET6: | |
142 | if (sock_set_ipv6_dscp(fd, IPTOS_PREC_INTERNETCONTROL) == -1) { | |
143 | close(fd); | |
144 | return (-1); | |
145 | } | |
146 | if (type == LDP_SOCKET_DISC) { | |
147 | if (sock_set_ipv6_mcast_loop(fd) == -1) { | |
148 | close(fd); | |
149 | return (-1); | |
150 | } | |
151 | if (sock_set_ipv6_mcast_hops(fd, 255) == -1) { | |
152 | close(fd); | |
153 | return (-1); | |
154 | } | |
155 | if (!(ldpd_conf->ipv6.flags & F_LDPD_AF_NO_GTSM)) { | |
eac6e3f0 RW |
156 | /* ignore any possible error */ |
157 | sock_set_ipv6_minhopcount(fd, 255); | |
8429abe0 RW |
158 | } |
159 | } | |
160 | if (type == LDP_SOCKET_DISC || type == LDP_SOCKET_EDISC) { | |
161 | if (sock_set_ipv6_pktinfo(fd, 1) == -1) { | |
162 | close(fd); | |
163 | return (-1); | |
164 | } | |
165 | } | |
166 | if (type == LDP_SOCKET_SESSION) { | |
167 | if (sock_set_ipv6_ucast_hops(fd, 255) == -1) { | |
168 | close(fd); | |
169 | return (-1); | |
170 | } | |
171 | } | |
172 | break; | |
173 | } | |
174 | switch (type) { | |
175 | case LDP_SOCKET_DISC: | |
176 | case LDP_SOCKET_EDISC: | |
177 | sock_set_recvbuf(fd); | |
178 | break; | |
179 | case LDP_SOCKET_SESSION: | |
180 | if (listen(fd, LDP_BACKLOG) == -1) | |
181 | log_warn("%s: error listening on socket", __func__); | |
182 | ||
eac6e3f0 | 183 | #ifdef __OpenBSD__ |
8429abe0 RW |
184 | opt = 1; |
185 | if (setsockopt(fd, IPPROTO_TCP, TCP_MD5SIG, &opt, | |
186 | sizeof(opt)) == -1) { | |
187 | if (errno == ENOPROTOOPT) { /* system w/o md5sig */ | |
188 | log_warnx("md5sig not available, disabling"); | |
189 | sysdep.no_md5sig = 1; | |
190 | } else { | |
191 | close(fd); | |
192 | return (-1); | |
193 | } | |
194 | } | |
eac6e3f0 | 195 | #endif |
8429abe0 RW |
196 | break; |
197 | } | |
198 | ||
199 | return (fd); | |
200 | } | |
201 | ||
eac6e3f0 RW |
202 | void |
203 | sock_set_nonblock(int fd) | |
204 | { | |
205 | int flags; | |
206 | ||
207 | if ((flags = fcntl(fd, F_GETFL, 0)) == -1) | |
208 | fatal("fcntl F_GETFL"); | |
209 | ||
210 | flags |= O_NONBLOCK; | |
211 | ||
212 | if ((flags = fcntl(fd, F_SETFL, flags)) == -1) | |
213 | fatal("fcntl F_SETFL"); | |
214 | } | |
215 | ||
216 | void | |
217 | sock_set_cloexec(int fd) | |
218 | { | |
219 | int flags; | |
220 | ||
221 | if ((flags = fcntl(fd, F_GETFD, 0)) == -1) | |
222 | fatal("fcntl F_GETFD"); | |
223 | ||
224 | flags |= FD_CLOEXEC; | |
225 | ||
226 | if ((flags = fcntl(fd, F_SETFD, flags)) == -1) | |
227 | fatal("fcntl F_SETFD"); | |
228 | } | |
229 | ||
8429abe0 RW |
230 | void |
231 | sock_set_recvbuf(int fd) | |
232 | { | |
233 | int bsize; | |
234 | ||
235 | bsize = 65535; | |
236 | while (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &bsize, | |
237 | sizeof(bsize)) == -1) | |
238 | bsize /= 2; | |
239 | } | |
240 | ||
241 | int | |
242 | sock_set_reuse(int fd, int enable) | |
243 | { | |
244 | if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &enable, | |
245 | sizeof(int)) < 0) { | |
246 | log_warn("%s: error setting SO_REUSEADDR", __func__); | |
247 | return (-1); | |
248 | } | |
249 | ||
250 | return (0); | |
251 | } | |
252 | ||
253 | int | |
254 | sock_set_bindany(int fd, int enable) | |
255 | { | |
eac6e3f0 | 256 | #ifdef HAVE_SO_BINDANY |
01b9e3fd DL |
257 | frr_elevate_privs(&ldpd_privs) { |
258 | if (setsockopt(fd, SOL_SOCKET, SO_BINDANY, &enable, | |
259 | sizeof(int)) < 0) { | |
260 | log_warn("%s: error setting SO_BINDANY", __func__); | |
261 | return (-1); | |
262 | } | |
8429abe0 | 263 | } |
eac6e3f0 RW |
264 | return (0); |
265 | #elif defined(HAVE_IP_FREEBIND) | |
266 | if (setsockopt(fd, IPPROTO_IP, IP_FREEBIND, &enable, sizeof(int)) < 0) { | |
267 | log_warn("%s: error setting IP_FREEBIND", __func__); | |
268 | return (-1); | |
269 | } | |
8429abe0 | 270 | return (0); |
eac6e3f0 RW |
271 | #else |
272 | log_warnx("%s: missing SO_BINDANY and IP_FREEBIND, unable to bind " | |
273 | "to a nonlocal IP address", __func__); | |
274 | return (-1); | |
275 | #endif /* HAVE_SO_BINDANY */ | |
276 | } | |
277 | ||
278 | #ifndef __OpenBSD__ | |
279 | /* | |
280 | * Set MD5 key for the socket, for the given peer address. If the password | |
281 | * is NULL or zero-length, the option will be disabled. | |
282 | */ | |
283 | int | |
284 | sock_set_md5sig(int fd, int af, union ldpd_addr *addr, const char *password) | |
285 | { | |
286 | int ret = -1; | |
287 | int save_errno = ENOSYS; | |
288 | #if HAVE_DECL_TCP_MD5SIG | |
289 | union sockunion su; | |
290 | #endif | |
291 | ||
292 | if (fd == -1) | |
293 | return (0); | |
294 | #if HAVE_DECL_TCP_MD5SIG | |
4149ef7c | 295 | addr2sa(af, addr, 0, &su); |
eac6e3f0 | 296 | |
6bb30c2c DL |
297 | frr_elevate_privs(&ldpe_privs) { |
298 | ret = sockopt_tcp_signature(fd, &su, password); | |
299 | save_errno = errno; | |
eac6e3f0 | 300 | } |
eac6e3f0 RW |
301 | #endif /* HAVE_TCP_MD5SIG */ |
302 | if (ret < 0) | |
303 | log_warnx("%s: can't set TCP_MD5SIG option on fd %d: %s", | |
304 | __func__, fd, safe_strerror(save_errno)); | |
305 | ||
306 | return (ret); | |
8429abe0 | 307 | } |
eac6e3f0 | 308 | #endif |
8429abe0 RW |
309 | |
310 | int | |
311 | sock_set_ipv4_tos(int fd, int tos) | |
312 | { | |
313 | if (setsockopt(fd, IPPROTO_IP, IP_TOS, (int *)&tos, sizeof(tos)) < 0) { | |
314 | log_warn("%s: error setting IP_TOS to 0x%x", __func__, tos); | |
315 | return (-1); | |
316 | } | |
317 | ||
318 | return (0); | |
319 | } | |
320 | ||
321 | int | |
322 | sock_set_ipv4_recvif(int fd, int enable) | |
323 | { | |
eac6e3f0 | 324 | return (setsockopt_ifindex(AF_INET, fd, enable)); |
8429abe0 RW |
325 | } |
326 | ||
327 | int | |
328 | sock_set_ipv4_minttl(int fd, int ttl) | |
329 | { | |
eac6e3f0 | 330 | return (sockopt_minttl(AF_INET, fd, ttl)); |
8429abe0 RW |
331 | } |
332 | ||
333 | int | |
334 | sock_set_ipv4_ucast_ttl(int fd, int ttl) | |
335 | { | |
336 | if (setsockopt(fd, IPPROTO_IP, IP_TTL, &ttl, sizeof(ttl)) < 0) { | |
337 | log_warn("%s: error setting IP_TTL", __func__); | |
338 | return (-1); | |
339 | } | |
340 | ||
341 | return (0); | |
342 | } | |
343 | ||
344 | int | |
345 | sock_set_ipv4_mcast_ttl(int fd, uint8_t ttl) | |
346 | { | |
347 | if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_TTL, | |
348 | (char *)&ttl, sizeof(ttl)) < 0) { | |
349 | log_warn("%s: error setting IP_MULTICAST_TTL to %d", | |
350 | __func__, ttl); | |
351 | return (-1); | |
352 | } | |
353 | ||
354 | return (0); | |
355 | } | |
356 | ||
eac6e3f0 RW |
357 | #ifndef MSG_MCAST |
358 | #if defined(HAVE_IP_PKTINFO) | |
359 | int | |
360 | sock_set_ipv4_pktinfo(int fd, int enable) | |
361 | { | |
362 | if (setsockopt(fd, IPPROTO_IP, IP_PKTINFO, &enable, | |
363 | sizeof(enable)) < 0) { | |
364 | log_warn("%s: error setting IP_PKTINFO", __func__); | |
365 | return (-1); | |
366 | } | |
367 | ||
368 | return (0); | |
369 | } | |
370 | #elif defined(HAVE_IP_RECVDSTADDR) | |
371 | int | |
372 | sock_set_ipv4_recvdstaddr(int fd, int enable) | |
373 | { | |
374 | if (setsockopt(fd, IPPROTO_IP, IP_RECVDSTADDR, &enable, | |
375 | sizeof(enable)) < 0) { | |
376 | log_warn("%s: error setting IP_RECVDSTADDR", __func__); | |
377 | return (-1); | |
378 | } | |
379 | ||
380 | return (0); | |
381 | } | |
382 | #else | |
383 | #error "Unsupported socket API" | |
384 | #endif | |
385 | #endif /* MSG_MCAST */ | |
386 | ||
8429abe0 RW |
387 | int |
388 | sock_set_ipv4_mcast(struct iface *iface) | |
389 | { | |
eac6e3f0 | 390 | struct in_addr if_addr; |
8429abe0 | 391 | |
eac6e3f0 | 392 | if_addr.s_addr = if_get_ipv4_addr(iface); |
8429abe0 | 393 | |
eac6e3f0 RW |
394 | if (setsockopt_ipv4_multicast_if(global.ipv4.ldp_disc_socket, |
395 | if_addr, iface->ifindex) < 0) { | |
8429abe0 RW |
396 | log_warn("%s: error setting IP_MULTICAST_IF, interface %s", |
397 | __func__, iface->name); | |
398 | return (-1); | |
399 | } | |
400 | ||
401 | return (0); | |
402 | } | |
403 | ||
404 | int | |
405 | sock_set_ipv4_mcast_loop(int fd) | |
406 | { | |
c5bdb09f | 407 | return (setsockopt_ipv4_multicast_loop(fd, 0)); |
8429abe0 RW |
408 | } |
409 | ||
410 | int | |
411 | sock_set_ipv6_dscp(int fd, int dscp) | |
412 | { | |
413 | if (setsockopt(fd, IPPROTO_IPV6, IPV6_TCLASS, &dscp, | |
414 | sizeof(dscp)) < 0) { | |
415 | log_warn("%s: error setting IPV6_TCLASS", __func__); | |
416 | return (-1); | |
417 | } | |
418 | ||
419 | return (0); | |
420 | } | |
421 | ||
422 | int | |
423 | sock_set_ipv6_pktinfo(int fd, int enable) | |
424 | { | |
425 | if (setsockopt(fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &enable, | |
426 | sizeof(enable)) < 0) { | |
427 | log_warn("%s: error setting IPV6_RECVPKTINFO", __func__); | |
428 | return (-1); | |
429 | } | |
430 | ||
431 | return (0); | |
432 | } | |
433 | ||
434 | int | |
435 | sock_set_ipv6_minhopcount(int fd, int hoplimit) | |
436 | { | |
eac6e3f0 | 437 | return (sockopt_minttl(AF_INET6, fd, hoplimit)); |
8429abe0 RW |
438 | } |
439 | ||
440 | int | |
441 | sock_set_ipv6_ucast_hops(int fd, int hoplimit) | |
442 | { | |
443 | if (setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, | |
444 | &hoplimit, sizeof(hoplimit)) < 0) { | |
445 | log_warn("%s: error setting IPV6_UNICAST_HOPS", __func__); | |
446 | return (-1); | |
447 | } | |
448 | ||
449 | return (0); | |
450 | } | |
451 | ||
452 | int | |
453 | sock_set_ipv6_mcast_hops(int fd, int hoplimit) | |
454 | { | |
455 | if (setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, | |
456 | &hoplimit, sizeof(hoplimit)) < 0) { | |
457 | log_warn("%s: error setting IPV6_MULTICAST_HOPS", __func__); | |
458 | return (-1); | |
459 | } | |
460 | ||
461 | return (0); | |
462 | } | |
463 | ||
464 | int | |
465 | sock_set_ipv6_mcast(struct iface *iface) | |
466 | { | |
467 | if (setsockopt(global.ipv6.ldp_disc_socket, IPPROTO_IPV6, | |
468 | IPV6_MULTICAST_IF, &iface->ifindex, sizeof(iface->ifindex)) < 0) { | |
469 | log_warn("%s: error setting IPV6_MULTICAST_IF, interface %s", | |
470 | __func__, iface->name); | |
471 | return (-1); | |
472 | } | |
473 | ||
474 | return (0); | |
475 | } | |
476 | ||
477 | int | |
478 | sock_set_ipv6_mcast_loop(int fd) | |
479 | { | |
480 | unsigned int loop = 0; | |
481 | ||
482 | if (setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, | |
483 | &loop, sizeof(loop)) < 0) { | |
484 | log_warn("%s: error setting IPV6_MULTICAST_LOOP", __func__); | |
485 | return (-1); | |
486 | } | |
487 | ||
488 | return (0); | |
489 | } |