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Merge pull request #5681 from opensourcerouting/manpage-rename
[mirror_frr.git] / ldpd / ldpd.c
1 /* $OpenBSD$ */
2
3 /*
4 * Copyright (c) 2013, 2016 Renato Westphal <renato@openbsd.org>
5 * Copyright (c) 2005 Claudio Jeker <claudio@openbsd.org>
6 * Copyright (c) 2004, 2008 Esben Norby <norby@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
22 #include <zebra.h>
23 #include <sys/wait.h>
24
25 #include "ldpd.h"
26 #include "ldpe.h"
27 #include "lde.h"
28 #include "log.h"
29 #include "ldp_vty.h"
30 #include "ldp_debug.h"
31
32 #include <lib/version.h>
33 #include <lib/log.h>
34 #include "getopt.h"
35 #include "vty.h"
36 #include "command.h"
37 #include "memory.h"
38 #include "privs.h"
39 #include "sigevent.h"
40 #include "zclient.h"
41 #include "vrf.h"
42 #include "filter.h"
43 #include "qobj.h"
44 #include "libfrr.h"
45 #include "lib_errors.h"
46
47 static void ldpd_shutdown(void);
48 static pid_t start_child(enum ldpd_process, char *, int, int);
49 static int main_dispatch_ldpe(struct thread *);
50 static int main_dispatch_lde(struct thread *);
51 static int main_imsg_send_ipc_sockets(struct imsgbuf *,
52 struct imsgbuf *);
53 static void main_imsg_send_net_sockets(int);
54 static void main_imsg_send_net_socket(int, enum socket_type);
55 static int main_imsg_send_config(struct ldpd_conf *);
56 static void ldp_config_normalize(struct ldpd_conf *);
57 static void ldp_config_reset(struct ldpd_conf *);
58 static void ldp_config_reset_main(struct ldpd_conf *);
59 static void ldp_config_reset_af(struct ldpd_conf *, int);
60 static void ldp_config_reset_l2vpns(struct ldpd_conf *);
61 static void merge_global(struct ldpd_conf *, struct ldpd_conf *);
62 static void merge_af(int, struct ldpd_af_conf *,
63 struct ldpd_af_conf *);
64 static void merge_ifaces(struct ldpd_conf *, struct ldpd_conf *);
65 static void merge_iface_af(struct iface_af *, struct iface_af *);
66 static void merge_tnbrs(struct ldpd_conf *, struct ldpd_conf *);
67 static void merge_nbrps(struct ldpd_conf *, struct ldpd_conf *);
68 static void merge_l2vpns(struct ldpd_conf *, struct ldpd_conf *);
69 static void merge_l2vpn(struct ldpd_conf *, struct l2vpn *,
70 struct l2vpn *);
71
72 DEFINE_QOBJ_TYPE(iface)
73 DEFINE_QOBJ_TYPE(tnbr)
74 DEFINE_QOBJ_TYPE(nbr_params)
75 DEFINE_QOBJ_TYPE(l2vpn_if)
76 DEFINE_QOBJ_TYPE(l2vpn_pw)
77 DEFINE_QOBJ_TYPE(l2vpn)
78 DEFINE_QOBJ_TYPE(ldpd_conf)
79
80 struct ldpd_global global;
81 struct ldpd_init init;
82 struct ldpd_conf *ldpd_conf, *vty_conf;
83
84 static struct imsgev *iev_ldpe, *iev_ldpe_sync;
85 static struct imsgev *iev_lde, *iev_lde_sync;
86 static pid_t ldpe_pid;
87 static pid_t lde_pid;
88
89 #define LDP_DEFAULT_CONFIG "ldpd.conf"
90 #define LDP_VTY_PORT 2612
91
92 /* Master of threads. */
93 struct thread_master *master;
94
95 static struct frr_daemon_info ldpd_di;
96
97 /* ldpd privileges */
98 static zebra_capabilities_t _caps_p [] =
99 {
100 ZCAP_BIND,
101 ZCAP_NET_ADMIN
102 };
103
104 struct zebra_privs_t ldpd_privs =
105 {
106 #if defined(FRR_USER) && defined(FRR_GROUP)
107 .user = FRR_USER,
108 .group = FRR_GROUP,
109 #endif
110 #if defined(VTY_GROUP)
111 .vty_group = VTY_GROUP,
112 #endif
113 .caps_p = _caps_p,
114 .cap_num_p = array_size(_caps_p),
115 .cap_num_i = 0
116 };
117
118 /* CTL Socket path */
119 char ctl_sock_path[MAXPATHLEN];
120
121 /* LDPd options. */
122 #define OPTION_CTLSOCK 1001
123 static const struct option longopts[] =
124 {
125 { "ctl_socket", required_argument, NULL, OPTION_CTLSOCK},
126 { "instance", required_argument, NULL, 'n'},
127 { 0 }
128 };
129
130 /* SIGHUP handler. */
131 static void
132 sighup(void)
133 {
134 log_info("SIGHUP received");
135
136 /*
137 * Do a full configuration reload. In other words, reset vty_conf
138 * and build a new configuartion from scratch.
139 */
140 ldp_config_reset(vty_conf);
141 vty_read_config(NULL, ldpd_di.config_file, config_default);
142 ldp_config_apply(NULL, vty_conf);
143 }
144
145 /* SIGINT / SIGTERM handler. */
146 static void
147 sigint(void)
148 {
149 log_info("SIGINT received");
150 ldpd_shutdown();
151 }
152
153 /* SIGUSR1 handler. */
154 static void
155 sigusr1(void)
156 {
157 zlog_rotate();
158 }
159
160 static struct quagga_signal_t ldp_signals[] =
161 {
162 {
163 .signal = SIGHUP,
164 .handler = &sighup,
165 },
166 {
167 .signal = SIGINT,
168 .handler = &sigint,
169 },
170 {
171 .signal = SIGTERM,
172 .handler = &sigint,
173 },
174 {
175 .signal = SIGUSR1,
176 .handler = &sigusr1,
177 }
178 };
179
180 static const struct frr_yang_module_info *const ldpd_yang_modules[] = {
181 };
182
183 FRR_DAEMON_INFO(ldpd, LDP,
184 .vty_port = LDP_VTY_PORT,
185
186 .proghelp = "Implementation of the LDP protocol.",
187
188 .signals = ldp_signals,
189 .n_signals = array_size(ldp_signals),
190
191 .privs = &ldpd_privs,
192
193 .yang_modules = ldpd_yang_modules,
194 .n_yang_modules = array_size(ldpd_yang_modules),
195 )
196
197 static int ldp_config_fork_apply(struct thread *t)
198 {
199 /*
200 * So the frr_config_fork() function schedules
201 * the read of the vty config( if there is a
202 * non-integrated config ) to be after the
203 * end of startup and we are starting the
204 * main process loop. We need to schedule
205 * the application of this if necessary
206 * after the read in of the config.
207 */
208 ldp_config_apply(NULL, vty_conf);
209
210 return 0;
211 }
212
213 int
214 main(int argc, char *argv[])
215 {
216 char *saved_argv0;
217 int lflag = 0, eflag = 0;
218 int pipe_parent2ldpe[2], pipe_parent2ldpe_sync[2];
219 int pipe_parent2lde[2], pipe_parent2lde_sync[2];
220 char *ctl_sock_name;
221 struct thread *thread = NULL;
222 bool ctl_sock_used = false;
223
224 snprintf(ctl_sock_path, sizeof(ctl_sock_path), LDPD_SOCKET,
225 "", "");
226
227 ldpd_process = PROC_MAIN;
228 log_procname = log_procnames[ldpd_process];
229
230 saved_argv0 = argv[0];
231 if (saved_argv0 == NULL)
232 saved_argv0 = (char *)"ldpd";
233
234 frr_preinit(&ldpd_di, argc, argv);
235 frr_opt_add("LEn:", longopts,
236 " --ctl_socket Override ctl socket path\n"
237 " -n, --instance Instance id\n");
238
239 /* set default instance (to differentiate ldpd socket from lde one */
240 init.instance = 1;
241
242 while (1) {
243 int opt;
244
245 opt = frr_getopt(argc, argv, NULL);
246
247 if (opt == EOF)
248 break;
249
250 switch (opt) {
251 case 0:
252 break;
253 case OPTION_CTLSOCK:
254 ctl_sock_used = true;
255 ctl_sock_name = strrchr(LDPD_SOCKET, '/');
256 if (ctl_sock_name)
257 /* skip '/' */
258 ctl_sock_name++;
259 else
260 /*
261 * LDPD_SOCKET configured as relative path
262 * during config? Should really never happen for
263 * sensible config
264 */
265 ctl_sock_name = (char *)LDPD_SOCKET;
266 strlcpy(ctl_sock_path, optarg, sizeof(ctl_sock_path));
267 strlcat(ctl_sock_path, "/", sizeof(ctl_sock_path));
268 strlcat(ctl_sock_path, ctl_sock_name,
269 sizeof(ctl_sock_path));
270 break;
271 case 'n':
272 init.instance = atoi(optarg);
273 if (init.instance < 1)
274 exit(0);
275 break;
276 case 'L':
277 lflag = 1;
278 break;
279 case 'E':
280 eflag = 1;
281 break;
282 default:
283 frr_help_exit(1);
284 break;
285 }
286 }
287
288 if (ldpd_di.pathspace && !ctl_sock_used)
289 snprintf(ctl_sock_path, sizeof(ctl_sock_path), LDPD_SOCKET,
290 "/", ldpd_di.pathspace);
291
292 strlcpy(init.user, ldpd_privs.user, sizeof(init.user));
293 strlcpy(init.group, ldpd_privs.group, sizeof(init.group));
294 strlcpy(init.ctl_sock_path, ctl_sock_path, sizeof(init.ctl_sock_path));
295 strlcpy(init.zclient_serv_path, frr_zclientpath,
296 sizeof(init.zclient_serv_path));
297
298 argc -= optind;
299 if (argc > 0 || (lflag && eflag))
300 frr_help_exit(1);
301
302 /* check for root privileges */
303 if (geteuid() != 0) {
304 errno = EPERM;
305 perror(ldpd_di.progname);
306 exit(1);
307 }
308
309 if (lflag || eflag)
310 openzlog(ldpd_di.progname, "LDP", 0,
311 LOG_CONS | LOG_NDELAY | LOG_PID, LOG_DAEMON);
312 if (lflag)
313 lde();
314 else if (eflag)
315 ldpe();
316
317 if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe_parent2ldpe) == -1)
318 fatal("socketpair");
319 if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC,
320 pipe_parent2ldpe_sync) == -1)
321 fatal("socketpair");
322 if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe_parent2lde) == -1)
323 fatal("socketpair");
324 if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC,
325 pipe_parent2lde_sync) == -1)
326 fatal("socketpair");
327 sock_set_nonblock(pipe_parent2ldpe[0]);
328 sock_set_cloexec(pipe_parent2ldpe[0]);
329 sock_set_nonblock(pipe_parent2ldpe[1]);
330 sock_set_cloexec(pipe_parent2ldpe[1]);
331 sock_set_nonblock(pipe_parent2ldpe_sync[0]);
332 sock_set_cloexec(pipe_parent2ldpe_sync[0]);
333 sock_set_cloexec(pipe_parent2ldpe_sync[1]);
334 sock_set_nonblock(pipe_parent2lde[0]);
335 sock_set_cloexec(pipe_parent2lde[0]);
336 sock_set_nonblock(pipe_parent2lde[1]);
337 sock_set_cloexec(pipe_parent2lde[1]);
338 sock_set_nonblock(pipe_parent2lde_sync[0]);
339 sock_set_cloexec(pipe_parent2lde_sync[0]);
340 sock_set_cloexec(pipe_parent2lde_sync[1]);
341
342 /* start children */
343 lde_pid = start_child(PROC_LDE_ENGINE, saved_argv0,
344 pipe_parent2lde[1], pipe_parent2lde_sync[1]);
345 ldpe_pid = start_child(PROC_LDP_ENGINE, saved_argv0,
346 pipe_parent2ldpe[1], pipe_parent2ldpe_sync[1]);
347
348 master = frr_init();
349
350 vrf_init(NULL, NULL, NULL, NULL, NULL);
351 access_list_init();
352 ldp_vty_init();
353 ldp_zebra_init(master);
354
355 /*
356 * Create base configuration with sane defaults. All configuration
357 * requests (e.g. CLI) act on vty_conf and then call ldp_config_apply()
358 * to merge the changes into ldpd_conf, which contains the actual
359 * running configuration.
360 */
361 ldpd_conf = config_new_empty();
362 vty_conf = config_new_empty();
363 QOBJ_REG(vty_conf, ldpd_conf);
364
365 /* read configuration file and daemonize */
366 frr_config_fork();
367
368 /* apply configuration */
369 thread_add_event(master, ldp_config_fork_apply, NULL, 0, &thread);
370
371 /* setup pipes to children */
372 if ((iev_ldpe = calloc(1, sizeof(struct imsgev))) == NULL ||
373 (iev_ldpe_sync = calloc(1, sizeof(struct imsgev))) == NULL ||
374 (iev_lde = calloc(1, sizeof(struct imsgev))) == NULL ||
375 (iev_lde_sync = calloc(1, sizeof(struct imsgev))) == NULL)
376 fatal(NULL);
377 imsg_init(&iev_ldpe->ibuf, pipe_parent2ldpe[0]);
378 iev_ldpe->handler_read = main_dispatch_ldpe;
379 iev_ldpe->ev_read = NULL;
380 thread_add_read(master, iev_ldpe->handler_read, iev_ldpe, iev_ldpe->ibuf.fd,
381 &iev_ldpe->ev_read);
382 iev_ldpe->handler_write = ldp_write_handler;
383
384 imsg_init(&iev_ldpe_sync->ibuf, pipe_parent2ldpe_sync[0]);
385 iev_ldpe_sync->handler_read = main_dispatch_ldpe;
386 iev_ldpe_sync->ev_read = NULL;
387 thread_add_read(master, iev_ldpe_sync->handler_read, iev_ldpe_sync, iev_ldpe_sync->ibuf.fd,
388 &iev_ldpe_sync->ev_read);
389 iev_ldpe_sync->handler_write = ldp_write_handler;
390
391 imsg_init(&iev_lde->ibuf, pipe_parent2lde[0]);
392 iev_lde->handler_read = main_dispatch_lde;
393 iev_lde->ev_read = NULL;
394 thread_add_read(master, iev_lde->handler_read, iev_lde, iev_lde->ibuf.fd,
395 &iev_lde->ev_read);
396 iev_lde->handler_write = ldp_write_handler;
397
398 imsg_init(&iev_lde_sync->ibuf, pipe_parent2lde_sync[0]);
399 iev_lde_sync->handler_read = main_dispatch_lde;
400 iev_lde_sync->ev_read = NULL;
401 thread_add_read(master, iev_lde_sync->handler_read, iev_lde_sync, iev_lde_sync->ibuf.fd,
402 &iev_lde_sync->ev_read);
403 iev_lde_sync->handler_write = ldp_write_handler;
404
405 if (main_imsg_send_ipc_sockets(&iev_ldpe->ibuf, &iev_lde->ibuf))
406 fatal("could not establish imsg links");
407 main_imsg_compose_both(IMSG_DEBUG_UPDATE, &ldp_debug,
408 sizeof(ldp_debug));
409 main_imsg_compose_both(IMSG_INIT, &init, sizeof(init));
410 main_imsg_send_config(ldpd_conf);
411
412 if (ldpd_conf->ipv4.flags & F_LDPD_AF_ENABLED)
413 main_imsg_send_net_sockets(AF_INET);
414 if (ldpd_conf->ipv6.flags & F_LDPD_AF_ENABLED)
415 main_imsg_send_net_sockets(AF_INET6);
416
417 frr_run(master);
418
419 /* NOTREACHED */
420 return (0);
421 }
422
423 static void
424 ldpd_shutdown(void)
425 {
426 pid_t pid;
427 int status;
428
429 frr_early_fini();
430
431 /* close pipes */
432 msgbuf_clear(&iev_ldpe->ibuf.w);
433 close(iev_ldpe->ibuf.fd);
434 msgbuf_clear(&iev_lde->ibuf.w);
435 close(iev_lde->ibuf.fd);
436
437 config_clear(ldpd_conf);
438
439 ldp_config_reset(vty_conf);
440 QOBJ_UNREG(vty_conf);
441 free(vty_conf);
442
443 log_debug("waiting for children to terminate");
444
445 while (true) {
446 /* Wait for child process. */
447 pid = wait(&status);
448 if (pid == -1) {
449 /* We got interrupted, try again. */
450 if (errno == EINTR)
451 continue;
452 /* No more processes were found. */
453 if (errno == ECHILD)
454 break;
455
456 /* Unhandled errno condition. */
457 fatal("wait");
458 /* UNREACHABLE */
459 }
460
461 /* We found something, lets announce it. */
462 if (WIFSIGNALED(status))
463 log_warnx("%s terminated; signal %d",
464 (pid == lde_pid ? "label decision engine"
465 : "ldp engine"),
466 WTERMSIG(status));
467
468 /* Repeat until there are no more child processes. */
469 }
470
471 free(iev_ldpe);
472 free(iev_lde);
473
474 log_info("terminating");
475
476 vrf_terminate();
477 access_list_reset();
478 ldp_zebra_destroy();
479
480 frr_fini();
481 exit(0);
482 }
483
484 static pid_t
485 start_child(enum ldpd_process p, char *argv0, int fd_async, int fd_sync)
486 {
487 char *argv[3];
488 int argc = 0, nullfd;
489 pid_t pid;
490
491 switch (pid = fork()) {
492 case -1:
493 fatal("cannot fork");
494 case 0:
495 break;
496 default:
497 close(fd_async);
498 close(fd_sync);
499 return (pid);
500 }
501
502 nullfd = open("/dev/null", O_RDONLY | O_NOCTTY);
503 if (nullfd == -1) {
504 flog_err_sys(EC_LIB_SYSTEM_CALL,
505 "%s: failed to open /dev/null: %s", __func__,
506 safe_strerror(errno));
507 } else {
508 dup2(nullfd, 0);
509 dup2(nullfd, 1);
510 dup2(nullfd, 2);
511 close(nullfd);
512 }
513
514 if (dup2(fd_async, LDPD_FD_ASYNC) == -1)
515 fatal("cannot setup imsg async fd");
516 if (dup2(fd_sync, LDPD_FD_SYNC) == -1)
517 fatal("cannot setup imsg sync fd");
518
519 argv[argc++] = argv0;
520 switch (p) {
521 case PROC_MAIN:
522 fatalx("Can not start main process");
523 case PROC_LDE_ENGINE:
524 argv[argc++] = (char *)"-L";
525 break;
526 case PROC_LDP_ENGINE:
527 argv[argc++] = (char *)"-E";
528 break;
529 }
530 argv[argc++] = NULL;
531
532 execvp(argv0, argv);
533 fatal("execvp");
534 }
535
536 /* imsg handling */
537 /* ARGSUSED */
538 static int
539 main_dispatch_ldpe(struct thread *thread)
540 {
541 struct imsgev *iev = THREAD_ARG(thread);
542 struct imsgbuf *ibuf = &iev->ibuf;
543 struct imsg imsg;
544 int af;
545 ssize_t n;
546 int shut = 0;
547
548 iev->ev_read = NULL;
549
550 if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
551 fatal("imsg_read error");
552 if (n == 0) /* connection closed */
553 shut = 1;
554
555 for (;;) {
556 if ((n = imsg_get(ibuf, &imsg)) == -1)
557 fatal("imsg_get");
558
559 if (n == 0)
560 break;
561
562 switch (imsg.hdr.type) {
563 case IMSG_LOG:
564 logit(imsg.hdr.pid, "%s", (const char *)imsg.data);
565 break;
566 case IMSG_REQUEST_SOCKETS:
567 af = imsg.hdr.pid;
568 main_imsg_send_net_sockets(af);
569 break;
570 case IMSG_ACL_CHECK:
571 if (imsg.hdr.len != IMSG_HEADER_SIZE +
572 sizeof(struct acl_check))
573 fatalx("IMSG_ACL_CHECK imsg with wrong len");
574 ldp_acl_reply(iev, (struct acl_check *)imsg.data);
575 break;
576 default:
577 log_debug("%s: error handling imsg %d", __func__,
578 imsg.hdr.type);
579 break;
580 }
581 imsg_free(&imsg);
582 }
583 if (!shut)
584 imsg_event_add(iev);
585 else {
586 /* this pipe is dead, so remove the event handlers and exit */
587 THREAD_READ_OFF(iev->ev_read);
588 THREAD_WRITE_OFF(iev->ev_write);
589 ldpe_pid = 0;
590 if (lde_pid == 0)
591 ldpd_shutdown();
592 else
593 kill(lde_pid, SIGTERM);
594 }
595
596 return (0);
597 }
598
599 /* ARGSUSED */
600 static int
601 main_dispatch_lde(struct thread *thread)
602 {
603 struct imsgev *iev = THREAD_ARG(thread);
604 struct imsgbuf *ibuf = &iev->ibuf;
605 struct imsg imsg;
606 ssize_t n;
607 int shut = 0;
608
609 iev->ev_read = NULL;
610
611 if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
612 fatal("imsg_read error");
613 if (n == 0) /* connection closed */
614 shut = 1;
615
616 for (;;) {
617 if ((n = imsg_get(ibuf, &imsg)) == -1)
618 fatal("imsg_get");
619
620 if (n == 0)
621 break;
622
623 switch (imsg.hdr.type) {
624 case IMSG_LOG:
625 logit(imsg.hdr.pid, "%s", (const char *)imsg.data);
626 break;
627 case IMSG_KLABEL_CHANGE:
628 if (imsg.hdr.len - IMSG_HEADER_SIZE !=
629 sizeof(struct kroute))
630 fatalx("invalid size of IMSG_KLABEL_CHANGE");
631 if (kr_change(imsg.data))
632 log_warnx("%s: error changing route", __func__);
633 break;
634 case IMSG_KLABEL_DELETE:
635 if (imsg.hdr.len - IMSG_HEADER_SIZE !=
636 sizeof(struct kroute))
637 fatalx("invalid size of IMSG_KLABEL_DELETE");
638 if (kr_delete(imsg.data))
639 log_warnx("%s: error deleting route", __func__);
640 break;
641 case IMSG_KPW_ADD:
642 case IMSG_KPW_DELETE:
643 case IMSG_KPW_SET:
644 case IMSG_KPW_UNSET:
645 if (imsg.hdr.len - IMSG_HEADER_SIZE !=
646 sizeof(struct zapi_pw))
647 fatalx("invalid size of IMSG_KPWLABEL_CHANGE");
648
649 switch (imsg.hdr.type) {
650 case IMSG_KPW_ADD:
651 if (kmpw_add(imsg.data))
652 log_warnx("%s: error adding "
653 "pseudowire", __func__);
654 break;
655 case IMSG_KPW_DELETE:
656 if (kmpw_del(imsg.data))
657 log_warnx("%s: error deleting "
658 "pseudowire", __func__);
659 break;
660 case IMSG_KPW_SET:
661 if (kmpw_set(imsg.data))
662 log_warnx("%s: error setting "
663 "pseudowire", __func__);
664 break;
665 case IMSG_KPW_UNSET:
666 if (kmpw_unset(imsg.data))
667 log_warnx("%s: error unsetting "
668 "pseudowire", __func__);
669 break;
670 }
671 break;
672 case IMSG_ACL_CHECK:
673 if (imsg.hdr.len != IMSG_HEADER_SIZE +
674 sizeof(struct acl_check))
675 fatalx("IMSG_ACL_CHECK imsg with wrong len");
676 ldp_acl_reply(iev, (struct acl_check *)imsg.data);
677 break;
678 default:
679 log_debug("%s: error handling imsg %d", __func__,
680 imsg.hdr.type);
681 break;
682 }
683 imsg_free(&imsg);
684 }
685 if (!shut)
686 imsg_event_add(iev);
687 else {
688 /* this pipe is dead, so remove the event handlers and exit */
689 THREAD_READ_OFF(iev->ev_read);
690 THREAD_WRITE_OFF(iev->ev_write);
691 lde_pid = 0;
692 if (ldpe_pid == 0)
693 ldpd_shutdown();
694 else
695 kill(ldpe_pid, SIGTERM);
696 }
697
698 return (0);
699 }
700
701 /* ARGSUSED */
702 int
703 ldp_write_handler(struct thread *thread)
704 {
705 struct imsgev *iev = THREAD_ARG(thread);
706 struct imsgbuf *ibuf = &iev->ibuf;
707 ssize_t n;
708
709 iev->ev_write = NULL;
710
711 if ((n = msgbuf_write(&ibuf->w)) == -1 && errno != EAGAIN)
712 fatal("msgbuf_write");
713 if (n == 0) {
714 /* this pipe is dead, so remove the event handlers */
715 THREAD_READ_OFF(iev->ev_read);
716 THREAD_WRITE_OFF(iev->ev_write);
717 return (0);
718 }
719
720 imsg_event_add(iev);
721
722 return (0);
723 }
724
725 void
726 main_imsg_compose_ldpe(int type, pid_t pid, void *data, uint16_t datalen)
727 {
728 if (iev_ldpe == NULL)
729 return;
730 imsg_compose_event(iev_ldpe, type, 0, pid, -1, data, datalen);
731 }
732
733 void
734 main_imsg_compose_lde(int type, pid_t pid, void *data, uint16_t datalen)
735 {
736 imsg_compose_event(iev_lde, type, 0, pid, -1, data, datalen);
737 }
738
739 int
740 main_imsg_compose_both(enum imsg_type type, void *buf, uint16_t len)
741 {
742 if (iev_ldpe == NULL || iev_lde == NULL)
743 return (0);
744 if (imsg_compose_event(iev_ldpe, type, 0, 0, -1, buf, len) == -1)
745 return (-1);
746 if (imsg_compose_event(iev_lde, type, 0, 0, -1, buf, len) == -1)
747 return (-1);
748 return (0);
749 }
750
751 void
752 imsg_event_add(struct imsgev *iev)
753 {
754 if (iev->handler_read)
755 thread_add_read(master, iev->handler_read, iev, iev->ibuf.fd,
756 &iev->ev_read);
757
758 if (iev->handler_write && iev->ibuf.w.queued)
759 thread_add_write(master, iev->handler_write, iev,
760 iev->ibuf.fd, &iev->ev_write);
761 }
762
763 int
764 imsg_compose_event(struct imsgev *iev, uint16_t type, uint32_t peerid,
765 pid_t pid, int fd, void *data, uint16_t datalen)
766 {
767 int ret;
768
769 if ((ret = imsg_compose(&iev->ibuf, type, peerid,
770 pid, fd, data, datalen)) != -1)
771 imsg_event_add(iev);
772 return (ret);
773 }
774
775 void
776 evbuf_enqueue(struct evbuf *eb, struct ibuf *buf)
777 {
778 ibuf_close(&eb->wbuf, buf);
779 evbuf_event_add(eb);
780 }
781
782 void
783 evbuf_event_add(struct evbuf *eb)
784 {
785 if (eb->wbuf.queued)
786 thread_add_write(master, eb->handler, eb->arg, eb->wbuf.fd,
787 &eb->ev);
788 }
789
790 void
791 evbuf_init(struct evbuf *eb, int fd, int (*handler)(struct thread *),
792 void *arg)
793 {
794 msgbuf_init(&eb->wbuf);
795 eb->wbuf.fd = fd;
796 eb->handler = handler;
797 eb->arg = arg;
798 }
799
800 void
801 evbuf_clear(struct evbuf *eb)
802 {
803 THREAD_WRITE_OFF(eb->ev);
804 msgbuf_clear(&eb->wbuf);
805 eb->wbuf.fd = -1;
806 }
807
808 static int
809 main_imsg_send_ipc_sockets(struct imsgbuf *ldpe_buf, struct imsgbuf *lde_buf)
810 {
811 int pipe_ldpe2lde[2];
812
813 if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe_ldpe2lde) == -1)
814 return (-1);
815 sock_set_nonblock(pipe_ldpe2lde[0]);
816 sock_set_nonblock(pipe_ldpe2lde[1]);
817
818 if (imsg_compose(ldpe_buf, IMSG_SOCKET_IPC, 0, 0, pipe_ldpe2lde[0],
819 NULL, 0) == -1)
820 return (-1);
821 if (imsg_compose(lde_buf, IMSG_SOCKET_IPC, 0, 0, pipe_ldpe2lde[1],
822 NULL, 0) == -1)
823 return (-1);
824
825 return (0);
826 }
827
828 static void
829 main_imsg_send_net_sockets(int af)
830 {
831 if (!ldp_addrisset(af, &(ldp_af_conf_get(ldpd_conf, af))->trans_addr))
832 return;
833
834 main_imsg_send_net_socket(af, LDP_SOCKET_DISC);
835 main_imsg_send_net_socket(af, LDP_SOCKET_EDISC);
836 main_imsg_send_net_socket(af, LDP_SOCKET_SESSION);
837 imsg_compose_event(iev_ldpe, IMSG_SETUP_SOCKETS, af, 0, -1, NULL, 0);
838 }
839
840 static void
841 main_imsg_send_net_socket(int af, enum socket_type type)
842 {
843 int fd;
844
845 fd = ldp_create_socket(af, type);
846 if (fd == -1) {
847 log_warnx("%s: failed to create %s socket for address-family "
848 "%s", __func__, socket_name(type), af_name(af));
849 return;
850 }
851
852 imsg_compose_event(iev_ldpe, IMSG_SOCKET_NET, af, 0, fd, &type,
853 sizeof(type));
854 }
855
856 int
857 ldp_acl_request(struct imsgev *iev, char *acl_name, int af,
858 union ldpd_addr *addr, uint8_t prefixlen)
859 {
860 struct imsg imsg;
861 ssize_t n;
862 struct acl_check acl_check;
863
864 if (acl_name[0] == '\0')
865 return FILTER_PERMIT;
866
867 /* build request */
868 strlcpy(acl_check.acl, acl_name, sizeof(acl_check.acl));
869 acl_check.af = af;
870 acl_check.addr = *addr;
871 acl_check.prefixlen = prefixlen;
872
873 /* send (blocking) */
874 imsg_compose_event(iev, IMSG_ACL_CHECK, 0, 0, -1, &acl_check,
875 sizeof(acl_check));
876 imsg_flush(&iev->ibuf);
877
878 /* receive (blocking) and parse result */
879 if ((n = imsg_read(&iev->ibuf)) == -1)
880 fatal("imsg_read error");
881 if ((n = imsg_get(&iev->ibuf, &imsg)) == -1)
882 fatal("imsg_get");
883 if (imsg.hdr.type != IMSG_ACL_CHECK ||
884 imsg.hdr.len != IMSG_HEADER_SIZE + sizeof(int))
885 fatalx("ldp_acl_request: invalid response");
886
887 return (*((int *)imsg.data));
888 }
889
890 void
891 ldp_acl_reply(struct imsgev *iev, struct acl_check *acl_check)
892 {
893 struct access_list *alist;
894 struct prefix prefix;
895 int result;
896
897 alist = access_list_lookup(family2afi(acl_check->af), acl_check->acl);
898 if (alist == NULL)
899 result = FILTER_DENY;
900 else {
901 prefix.family = acl_check->af;
902 switch (prefix.family) {
903 case AF_INET:
904 prefix.u.prefix4 = acl_check->addr.v4;
905 break;
906 case AF_INET6:
907 prefix.u.prefix6 = acl_check->addr.v6;
908 break;
909 default:
910 fatalx("ldp_acl_reply: unknown af");
911 }
912 prefix.prefixlen = acl_check->prefixlen;
913 result = access_list_apply(alist, &prefix);
914 }
915
916 imsg_compose_event(iev, IMSG_ACL_CHECK, 0, 0, -1, &result,
917 sizeof(result));
918 }
919
920 struct ldpd_af_conf *
921 ldp_af_conf_get(struct ldpd_conf *xconf, int af)
922 {
923 switch (af) {
924 case AF_INET:
925 return (&xconf->ipv4);
926 case AF_INET6:
927 return (&xconf->ipv6);
928 default:
929 fatalx("ldp_af_conf_get: unknown af");
930 }
931 }
932
933 struct ldpd_af_global *
934 ldp_af_global_get(struct ldpd_global *xglobal, int af)
935 {
936 switch (af) {
937 case AF_INET:
938 return (&xglobal->ipv4);
939 case AF_INET6:
940 return (&xglobal->ipv6);
941 default:
942 fatalx("ldp_af_global_get: unknown af");
943 }
944 }
945
946 int
947 ldp_is_dual_stack(struct ldpd_conf *xconf)
948 {
949 return ((xconf->ipv4.flags & F_LDPD_AF_ENABLED) &&
950 (xconf->ipv6.flags & F_LDPD_AF_ENABLED));
951 }
952
953 in_addr_t
954 ldp_rtr_id_get(struct ldpd_conf *xconf)
955 {
956 if (xconf->rtr_id.s_addr != INADDR_ANY)
957 return (xconf->rtr_id.s_addr);
958 else
959 return (global.rtr_id.s_addr);
960 }
961
962 static int
963 main_imsg_send_config(struct ldpd_conf *xconf)
964 {
965 struct iface *iface;
966 struct tnbr *tnbr;
967 struct nbr_params *nbrp;
968 struct l2vpn *l2vpn;
969 struct l2vpn_if *lif;
970 struct l2vpn_pw *pw;
971
972 if (main_imsg_compose_both(IMSG_RECONF_CONF, xconf,
973 sizeof(*xconf)) == -1)
974 return (-1);
975
976 RB_FOREACH(iface, iface_head, &xconf->iface_tree) {
977 if (main_imsg_compose_both(IMSG_RECONF_IFACE, iface,
978 sizeof(*iface)) == -1)
979 return (-1);
980 }
981
982 RB_FOREACH(tnbr, tnbr_head, &xconf->tnbr_tree) {
983 if (main_imsg_compose_both(IMSG_RECONF_TNBR, tnbr,
984 sizeof(*tnbr)) == -1)
985 return (-1);
986 }
987
988 RB_FOREACH(nbrp, nbrp_head, &xconf->nbrp_tree) {
989 if (main_imsg_compose_both(IMSG_RECONF_NBRP, nbrp,
990 sizeof(*nbrp)) == -1)
991 return (-1);
992 }
993
994 RB_FOREACH(l2vpn, l2vpn_head, &xconf->l2vpn_tree) {
995 if (main_imsg_compose_both(IMSG_RECONF_L2VPN, l2vpn,
996 sizeof(*l2vpn)) == -1)
997 return (-1);
998
999 RB_FOREACH(lif, l2vpn_if_head, &l2vpn->if_tree) {
1000 if (main_imsg_compose_both(IMSG_RECONF_L2VPN_IF, lif,
1001 sizeof(*lif)) == -1)
1002 return (-1);
1003 }
1004 RB_FOREACH(pw, l2vpn_pw_head, &l2vpn->pw_tree) {
1005 if (main_imsg_compose_both(IMSG_RECONF_L2VPN_PW, pw,
1006 sizeof(*pw)) == -1)
1007 return (-1);
1008 }
1009 RB_FOREACH(pw, l2vpn_pw_head, &l2vpn->pw_inactive_tree) {
1010 if (main_imsg_compose_both(IMSG_RECONF_L2VPN_IPW, pw,
1011 sizeof(*pw)) == -1)
1012 return (-1);
1013 }
1014 }
1015
1016 if (main_imsg_compose_both(IMSG_RECONF_END, NULL, 0) == -1)
1017 return (-1);
1018
1019 return (0);
1020 }
1021
1022 int
1023 ldp_config_apply(struct vty *vty, struct ldpd_conf *xconf)
1024 {
1025 /*
1026 * When reading from a configuration file (startup and sighup), we
1027 * call merge_config() only once after the whole config has been read.
1028 * This is the optimal and least disruptive way to update the running
1029 * configuration.
1030 */
1031 if (vty && vty->type == VTY_FILE)
1032 return (0);
1033
1034 ldp_config_normalize(xconf);
1035
1036 if (main_imsg_send_config(xconf) == -1)
1037 return (-1);
1038
1039 merge_config(ldpd_conf, xconf);
1040
1041 return (0);
1042 }
1043
1044 static void
1045 ldp_config_normalize(struct ldpd_conf *xconf)
1046 {
1047 struct iface *iface, *itmp;
1048 struct nbr_params *nbrp, *ntmp;
1049 struct l2vpn *l2vpn;
1050 struct l2vpn_pw *pw, *ptmp;
1051
1052 if (!(xconf->flags & F_LDPD_ENABLED))
1053 ldp_config_reset_main(xconf);
1054 else {
1055 if (!(xconf->ipv4.flags & F_LDPD_AF_ENABLED))
1056 ldp_config_reset_af(xconf, AF_INET);
1057 if (!(xconf->ipv6.flags & F_LDPD_AF_ENABLED))
1058 ldp_config_reset_af(xconf, AF_INET6);
1059
1060 RB_FOREACH_SAFE(iface, iface_head, &xconf->iface_tree, itmp) {
1061 if (iface->ipv4.enabled || iface->ipv6.enabled)
1062 continue;
1063
1064 QOBJ_UNREG(iface);
1065 RB_REMOVE(iface_head, &vty_conf->iface_tree, iface);
1066 free(iface);
1067 }
1068
1069 RB_FOREACH_SAFE(nbrp, nbrp_head, &xconf->nbrp_tree, ntmp) {
1070 if (nbrp->flags & (F_NBRP_KEEPALIVE|F_NBRP_GTSM))
1071 continue;
1072 if (nbrp->auth.method != AUTH_NONE)
1073 continue;
1074
1075 QOBJ_UNREG(nbrp);
1076 RB_REMOVE(nbrp_head, &vty_conf->nbrp_tree, nbrp);
1077 free(nbrp);
1078 }
1079 }
1080
1081 RB_FOREACH(l2vpn, l2vpn_head, &xconf->l2vpn_tree) {
1082 RB_FOREACH_SAFE(pw, l2vpn_pw_head, &l2vpn->pw_tree, ptmp) {
1083 if (!(pw->flags & F_PW_STATIC_NBR_ADDR)) {
1084 pw->af = AF_INET;
1085 pw->addr.v4 = pw->lsr_id;
1086 }
1087
1088 if (pw->lsr_id.s_addr != INADDR_ANY && pw->pwid != 0)
1089 continue;
1090 RB_REMOVE(l2vpn_pw_head, &l2vpn->pw_tree, pw);
1091 RB_INSERT(l2vpn_pw_head, &l2vpn->pw_inactive_tree, pw);
1092 }
1093 RB_FOREACH_SAFE(pw, l2vpn_pw_head, &l2vpn->pw_inactive_tree,
1094 ptmp) {
1095 if (!(pw->flags & F_PW_STATIC_NBR_ADDR)) {
1096 pw->af = AF_INET;
1097 pw->addr.v4 = pw->lsr_id;
1098 }
1099
1100 if (pw->lsr_id.s_addr == INADDR_ANY || pw->pwid == 0)
1101 continue;
1102 RB_REMOVE(l2vpn_pw_head, &l2vpn->pw_inactive_tree, pw);
1103 RB_INSERT(l2vpn_pw_head, &l2vpn->pw_tree, pw);
1104 }
1105 }
1106 }
1107
1108 static void
1109 ldp_config_reset(struct ldpd_conf *conf)
1110 {
1111 ldp_config_reset_main(conf);
1112 ldp_config_reset_l2vpns(conf);
1113 }
1114
1115 static void
1116 ldp_config_reset_main(struct ldpd_conf *conf)
1117 {
1118 struct iface *iface;
1119 struct nbr_params *nbrp;
1120
1121 while (!RB_EMPTY(iface_head, &conf->iface_tree)) {
1122 iface = RB_ROOT(iface_head, &conf->iface_tree);
1123
1124 QOBJ_UNREG(iface);
1125 RB_REMOVE(iface_head, &conf->iface_tree, iface);
1126 free(iface);
1127 }
1128
1129 while (!RB_EMPTY(nbrp_head, &conf->nbrp_tree)) {
1130 nbrp = RB_ROOT(nbrp_head, &conf->nbrp_tree);
1131
1132 QOBJ_UNREG(nbrp);
1133 RB_REMOVE(nbrp_head, &conf->nbrp_tree, nbrp);
1134 free(nbrp);
1135 }
1136
1137 conf->rtr_id.s_addr = INADDR_ANY;
1138 ldp_config_reset_af(conf, AF_INET);
1139 ldp_config_reset_af(conf, AF_INET6);
1140 conf->lhello_holdtime = LINK_DFLT_HOLDTIME;
1141 conf->lhello_interval = DEFAULT_HELLO_INTERVAL;
1142 conf->thello_holdtime = TARGETED_DFLT_HOLDTIME;
1143 conf->thello_interval = DEFAULT_HELLO_INTERVAL;
1144 conf->trans_pref = DUAL_STACK_LDPOV6;
1145 conf->flags = 0;
1146 }
1147
1148 static void
1149 ldp_config_reset_af(struct ldpd_conf *conf, int af)
1150 {
1151 struct ldpd_af_conf *af_conf;
1152 struct iface *iface;
1153 struct iface_af *ia;
1154 struct tnbr *tnbr, *ttmp;
1155
1156 RB_FOREACH(iface, iface_head, &conf->iface_tree) {
1157 ia = iface_af_get(iface, af);
1158 ia->enabled = 0;
1159 }
1160
1161 RB_FOREACH_SAFE(tnbr, tnbr_head, &conf->tnbr_tree, ttmp) {
1162 if (tnbr->af != af)
1163 continue;
1164
1165 QOBJ_UNREG(tnbr);
1166 RB_REMOVE(tnbr_head, &conf->tnbr_tree, tnbr);
1167 free(tnbr);
1168 }
1169
1170 af_conf = ldp_af_conf_get(conf, af);
1171 af_conf->keepalive = 180;
1172 af_conf->lhello_holdtime = 0;
1173 af_conf->lhello_interval = 0;
1174 af_conf->thello_holdtime = 0;
1175 af_conf->thello_interval = 0;
1176 memset(&af_conf->trans_addr, 0, sizeof(af_conf->trans_addr));
1177 af_conf->flags = 0;
1178 }
1179
1180 static void
1181 ldp_config_reset_l2vpns(struct ldpd_conf *conf)
1182 {
1183 struct l2vpn *l2vpn;
1184 struct l2vpn_if *lif;
1185 struct l2vpn_pw *pw;
1186
1187 while (!RB_EMPTY(l2vpn_head, &conf->l2vpn_tree)) {
1188 l2vpn = RB_ROOT(l2vpn_head, &conf->l2vpn_tree);
1189 while (!RB_EMPTY(l2vpn_if_head, &l2vpn->if_tree)) {
1190 lif = RB_ROOT(l2vpn_if_head, &l2vpn->if_tree);
1191
1192 QOBJ_UNREG(lif);
1193 RB_REMOVE(l2vpn_if_head, &l2vpn->if_tree, lif);
1194 free(lif);
1195 }
1196 while (!RB_EMPTY(l2vpn_pw_head, &l2vpn->pw_tree)) {
1197 pw = RB_ROOT(l2vpn_pw_head, &l2vpn->pw_tree);
1198
1199 QOBJ_UNREG(pw);
1200 RB_REMOVE(l2vpn_pw_head, &l2vpn->pw_tree, pw);
1201 free(pw);
1202 }
1203 while (!RB_EMPTY(l2vpn_pw_head, &l2vpn->pw_inactive_tree)) {
1204 pw = RB_ROOT(l2vpn_pw_head, &l2vpn->pw_inactive_tree);
1205
1206 QOBJ_UNREG(pw);
1207 RB_REMOVE(l2vpn_pw_head, &l2vpn->pw_inactive_tree, pw);
1208 free(pw);
1209 }
1210 QOBJ_UNREG(l2vpn);
1211 RB_REMOVE(l2vpn_head, &conf->l2vpn_tree, l2vpn);
1212 free(l2vpn);
1213 }
1214 }
1215
1216 void
1217 ldp_clear_config(struct ldpd_conf *xconf)
1218 {
1219 struct iface *iface;
1220 struct tnbr *tnbr;
1221 struct nbr_params *nbrp;
1222 struct l2vpn *l2vpn;
1223
1224 while (!RB_EMPTY(iface_head, &xconf->iface_tree)) {
1225 iface = RB_ROOT(iface_head, &xconf->iface_tree);
1226
1227 RB_REMOVE(iface_head, &xconf->iface_tree, iface);
1228 free(iface);
1229 }
1230 while (!RB_EMPTY(tnbr_head, &xconf->tnbr_tree)) {
1231 tnbr = RB_ROOT(tnbr_head, &xconf->tnbr_tree);
1232
1233 RB_REMOVE(tnbr_head, &xconf->tnbr_tree, tnbr);
1234 free(tnbr);
1235 }
1236 while (!RB_EMPTY(nbrp_head, &xconf->nbrp_tree)) {
1237 nbrp = RB_ROOT(nbrp_head, &xconf->nbrp_tree);
1238
1239 RB_REMOVE(nbrp_head, &xconf->nbrp_tree, nbrp);
1240 free(nbrp);
1241 }
1242 while (!RB_EMPTY(l2vpn_head, &xconf->l2vpn_tree)) {
1243 l2vpn = RB_ROOT(l2vpn_head, &xconf->l2vpn_tree);
1244
1245 RB_REMOVE(l2vpn_head, &xconf->l2vpn_tree, l2vpn);
1246 l2vpn_del(l2vpn);
1247 }
1248
1249 free(xconf);
1250 }
1251
1252 #define COPY(a, b) do { \
1253 a = malloc(sizeof(*a)); \
1254 if (a == NULL) \
1255 fatal(__func__); \
1256 *a = *b; \
1257 } while (0)
1258
1259 void
1260 merge_config(struct ldpd_conf *conf, struct ldpd_conf *xconf)
1261 {
1262 merge_global(conf, xconf);
1263 merge_af(AF_INET, &conf->ipv4, &xconf->ipv4);
1264 merge_af(AF_INET6, &conf->ipv6, &xconf->ipv6);
1265 merge_ifaces(conf, xconf);
1266 merge_tnbrs(conf, xconf);
1267 merge_nbrps(conf, xconf);
1268 merge_l2vpns(conf, xconf);
1269 }
1270
1271 static void
1272 merge_global(struct ldpd_conf *conf, struct ldpd_conf *xconf)
1273 {
1274 /* change of router-id requires resetting all neighborships */
1275 if (conf->rtr_id.s_addr != xconf->rtr_id.s_addr) {
1276 if (ldpd_process == PROC_LDP_ENGINE) {
1277 ldpe_reset_nbrs(AF_UNSPEC);
1278 if (conf->rtr_id.s_addr == INADDR_ANY ||
1279 xconf->rtr_id.s_addr == INADDR_ANY) {
1280 if_update_all(AF_UNSPEC);
1281 tnbr_update_all(AF_UNSPEC);
1282 }
1283 }
1284 conf->rtr_id = xconf->rtr_id;
1285 }
1286
1287 conf->lhello_holdtime = xconf->lhello_holdtime;
1288 conf->lhello_interval = xconf->lhello_interval;
1289 conf->thello_holdtime = xconf->thello_holdtime;
1290 conf->thello_interval = xconf->thello_interval;
1291
1292 if (conf->trans_pref != xconf->trans_pref) {
1293 if (ldpd_process == PROC_LDP_ENGINE)
1294 ldpe_reset_ds_nbrs();
1295 conf->trans_pref = xconf->trans_pref;
1296 }
1297
1298 if ((conf->flags & F_LDPD_DS_CISCO_INTEROP) !=
1299 (xconf->flags & F_LDPD_DS_CISCO_INTEROP)) {
1300 if (ldpd_process == PROC_LDP_ENGINE)
1301 ldpe_reset_ds_nbrs();
1302 }
1303
1304 conf->flags = xconf->flags;
1305 }
1306
1307 static void
1308 merge_af(int af, struct ldpd_af_conf *af_conf, struct ldpd_af_conf *xa)
1309 {
1310 int stop_init_backoff = 0;
1311 int remove_dynamic_tnbrs = 0;
1312 int change_egress_label = 0;
1313 int reset_nbrs_ipv4 = 0;
1314 int reset_nbrs = 0;
1315 int update_sockets = 0;
1316
1317 /* update timers */
1318 if (af_conf->keepalive != xa->keepalive) {
1319 af_conf->keepalive = xa->keepalive;
1320 stop_init_backoff = 1;
1321 }
1322 af_conf->lhello_holdtime = xa->lhello_holdtime;
1323 af_conf->lhello_interval = xa->lhello_interval;
1324 af_conf->thello_holdtime = xa->thello_holdtime;
1325 af_conf->thello_interval = xa->thello_interval;
1326
1327 /* update flags */
1328 if ((af_conf->flags & F_LDPD_AF_THELLO_ACCEPT) &&
1329 !(xa->flags & F_LDPD_AF_THELLO_ACCEPT))
1330 remove_dynamic_tnbrs = 1;
1331 if ((af_conf->flags & F_LDPD_AF_NO_GTSM) !=
1332 (xa->flags & F_LDPD_AF_NO_GTSM)) {
1333 if (af == AF_INET6)
1334 /* need to set/unset IPV6_MINHOPCOUNT */
1335 update_sockets = 1;
1336 else
1337 /* for LDPv4 just resetting the neighbors is enough */
1338 reset_nbrs_ipv4 = 1;
1339 }
1340 if ((af_conf->flags & F_LDPD_AF_EXPNULL) !=
1341 (xa->flags & F_LDPD_AF_EXPNULL))
1342 change_egress_label = 1;
1343 af_conf->flags = xa->flags;
1344
1345 /* update the transport address */
1346 if (ldp_addrcmp(af, &af_conf->trans_addr, &xa->trans_addr)) {
1347 af_conf->trans_addr = xa->trans_addr;
1348 update_sockets = 1;
1349 }
1350
1351 /* update ACLs */
1352 if (strcmp(af_conf->acl_label_advertise_to,
1353 xa->acl_label_advertise_to) ||
1354 strcmp(af_conf->acl_label_advertise_for,
1355 xa->acl_label_advertise_for) ||
1356 strcmp(af_conf->acl_label_accept_from,
1357 xa->acl_label_accept_from) ||
1358 strcmp(af_conf->acl_label_accept_for,
1359 xa->acl_label_accept_for))
1360 reset_nbrs = 1;
1361 if (strcmp(af_conf->acl_thello_accept_from, xa->acl_thello_accept_from))
1362 remove_dynamic_tnbrs = 1;
1363 if (strcmp(af_conf->acl_label_expnull_for, xa->acl_label_expnull_for))
1364 change_egress_label = 1;
1365 strlcpy(af_conf->acl_thello_accept_from, xa->acl_thello_accept_from,
1366 sizeof(af_conf->acl_thello_accept_from));
1367 strlcpy(af_conf->acl_label_allocate_for, xa->acl_label_allocate_for,
1368 sizeof(af_conf->acl_label_allocate_for));
1369 strlcpy(af_conf->acl_label_advertise_to, xa->acl_label_advertise_to,
1370 sizeof(af_conf->acl_label_advertise_to));
1371 strlcpy(af_conf->acl_label_advertise_for, xa->acl_label_advertise_for,
1372 sizeof(af_conf->acl_label_advertise_for));
1373 strlcpy(af_conf->acl_label_accept_from, xa->acl_label_accept_from,
1374 sizeof(af_conf->acl_label_accept_from));
1375 strlcpy(af_conf->acl_label_accept_for, xa->acl_label_accept_for,
1376 sizeof(af_conf->acl_label_accept_for));
1377 strlcpy(af_conf->acl_label_expnull_for, xa->acl_label_expnull_for,
1378 sizeof(af_conf->acl_label_expnull_for));
1379
1380 /* apply the new configuration */
1381 switch (ldpd_process) {
1382 case PROC_LDE_ENGINE:
1383 if (change_egress_label)
1384 lde_change_egress_label(af);
1385 break;
1386 case PROC_LDP_ENGINE:
1387 if (stop_init_backoff)
1388 ldpe_stop_init_backoff(af);
1389 if (remove_dynamic_tnbrs)
1390 ldpe_remove_dynamic_tnbrs(af);
1391 if (reset_nbrs)
1392 ldpe_reset_nbrs(AF_UNSPEC);
1393 else if (reset_nbrs_ipv4)
1394 ldpe_reset_nbrs(AF_INET);
1395 break;
1396 case PROC_MAIN:
1397 if (update_sockets && iev_ldpe)
1398 imsg_compose_event(iev_ldpe, IMSG_CLOSE_SOCKETS, af,
1399 0, -1, NULL, 0);
1400 break;
1401 }
1402 }
1403
1404 static void
1405 merge_ifaces(struct ldpd_conf *conf, struct ldpd_conf *xconf)
1406 {
1407 struct iface *iface, *itmp, *xi;
1408
1409 RB_FOREACH_SAFE(iface, iface_head, &conf->iface_tree, itmp) {
1410 /* find deleted interfaces */
1411 if ((xi = if_lookup_name(xconf, iface->name)) == NULL) {
1412 switch (ldpd_process) {
1413 case PROC_LDP_ENGINE:
1414 ldpe_if_exit(iface);
1415 break;
1416 case PROC_LDE_ENGINE:
1417 case PROC_MAIN:
1418 break;
1419 }
1420 RB_REMOVE(iface_head, &conf->iface_tree, iface);
1421 free(iface);
1422 }
1423 }
1424 RB_FOREACH_SAFE(xi, iface_head, &xconf->iface_tree, itmp) {
1425 /* find new interfaces */
1426 if ((iface = if_lookup_name(conf, xi->name)) == NULL) {
1427 COPY(iface, xi);
1428 RB_INSERT(iface_head, &conf->iface_tree, iface);
1429
1430 switch (ldpd_process) {
1431 case PROC_LDP_ENGINE:
1432 ldpe_if_init(iface);
1433 break;
1434 case PROC_LDE_ENGINE:
1435 break;
1436 case PROC_MAIN:
1437 /* resend addresses to activate new interfaces */
1438 kif_redistribute(iface->name);
1439 break;
1440 }
1441 continue;
1442 }
1443
1444 /* update existing interfaces */
1445 merge_iface_af(&iface->ipv4, &xi->ipv4);
1446 merge_iface_af(&iface->ipv6, &xi->ipv6);
1447 }
1448 }
1449
1450 static void
1451 merge_iface_af(struct iface_af *ia, struct iface_af *xi)
1452 {
1453 if (ia->enabled != xi->enabled) {
1454 ia->enabled = xi->enabled;
1455 if (ldpd_process == PROC_LDP_ENGINE)
1456 ldp_if_update(ia->iface, ia->af);
1457 }
1458 ia->hello_holdtime = xi->hello_holdtime;
1459 ia->hello_interval = xi->hello_interval;
1460 }
1461
1462 static void
1463 merge_tnbrs(struct ldpd_conf *conf, struct ldpd_conf *xconf)
1464 {
1465 struct tnbr *tnbr, *ttmp, *xt;
1466
1467 RB_FOREACH_SAFE(tnbr, tnbr_head, &conf->tnbr_tree, ttmp) {
1468 if (!(tnbr->flags & F_TNBR_CONFIGURED))
1469 continue;
1470
1471 /* find deleted tnbrs */
1472 if ((xt = tnbr_find(xconf, tnbr->af, &tnbr->addr)) == NULL) {
1473 switch (ldpd_process) {
1474 case PROC_LDP_ENGINE:
1475 tnbr->flags &= ~F_TNBR_CONFIGURED;
1476 tnbr_check(conf, tnbr);
1477 break;
1478 case PROC_LDE_ENGINE:
1479 case PROC_MAIN:
1480 RB_REMOVE(tnbr_head, &conf->tnbr_tree, tnbr);
1481 free(tnbr);
1482 break;
1483 }
1484 }
1485 }
1486 RB_FOREACH_SAFE(xt, tnbr_head, &xconf->tnbr_tree, ttmp) {
1487 /* find new tnbrs */
1488 if ((tnbr = tnbr_find(conf, xt->af, &xt->addr)) == NULL) {
1489 COPY(tnbr, xt);
1490 RB_INSERT(tnbr_head, &conf->tnbr_tree, tnbr);
1491
1492 switch (ldpd_process) {
1493 case PROC_LDP_ENGINE:
1494 tnbr_update(tnbr);
1495 break;
1496 case PROC_LDE_ENGINE:
1497 case PROC_MAIN:
1498 break;
1499 }
1500 continue;
1501 }
1502
1503 /* update existing tnbrs */
1504 if (!(tnbr->flags & F_TNBR_CONFIGURED))
1505 tnbr->flags |= F_TNBR_CONFIGURED;
1506 }
1507 }
1508
1509 static void
1510 merge_nbrps(struct ldpd_conf *conf, struct ldpd_conf *xconf)
1511 {
1512 struct nbr_params *nbrp, *ntmp, *xn;
1513 struct nbr *nbr;
1514 int nbrp_changed;
1515
1516 RB_FOREACH_SAFE(nbrp, nbrp_head, &conf->nbrp_tree, ntmp) {
1517 /* find deleted nbrps */
1518 if ((xn = nbr_params_find(xconf, nbrp->lsr_id)) == NULL) {
1519 switch (ldpd_process) {
1520 case PROC_LDP_ENGINE:
1521 nbr = nbr_find_ldpid(nbrp->lsr_id.s_addr);
1522 if (nbr) {
1523 session_shutdown(nbr, S_SHUTDOWN, 0, 0);
1524 #ifdef __OpenBSD__
1525 pfkey_remove(nbr);
1526 #else
1527 sock_set_md5sig(
1528 (ldp_af_global_get(&global,
1529 nbr->af))->ldp_session_socket,
1530 nbr->af, &nbr->raddr, NULL);
1531 #endif
1532 nbr->auth.method = AUTH_NONE;
1533 if (nbr_session_active_role(nbr))
1534 nbr_establish_connection(nbr);
1535 }
1536 break;
1537 case PROC_LDE_ENGINE:
1538 case PROC_MAIN:
1539 break;
1540 }
1541 RB_REMOVE(nbrp_head, &conf->nbrp_tree, nbrp);
1542 free(nbrp);
1543 }
1544 }
1545 RB_FOREACH_SAFE(xn, nbrp_head, &xconf->nbrp_tree, ntmp) {
1546 /* find new nbrps */
1547 if ((nbrp = nbr_params_find(conf, xn->lsr_id)) == NULL) {
1548 COPY(nbrp, xn);
1549 RB_INSERT(nbrp_head, &conf->nbrp_tree, nbrp);
1550
1551 switch (ldpd_process) {
1552 case PROC_LDP_ENGINE:
1553 nbr = nbr_find_ldpid(nbrp->lsr_id.s_addr);
1554 if (nbr) {
1555 session_shutdown(nbr, S_SHUTDOWN, 0, 0);
1556 nbr->auth.method = nbrp->auth.method;
1557 #ifdef __OpenBSD__
1558 if (pfkey_establish(nbr, nbrp) == -1)
1559 fatalx("pfkey setup failed");
1560 #else
1561 sock_set_md5sig(
1562 (ldp_af_global_get(&global,
1563 nbr->af))->ldp_session_socket,
1564 nbr->af, &nbr->raddr,
1565 nbrp->auth.md5key);
1566 #endif
1567 if (nbr_session_active_role(nbr))
1568 nbr_establish_connection(nbr);
1569 }
1570 break;
1571 case PROC_LDE_ENGINE:
1572 case PROC_MAIN:
1573 break;
1574 }
1575 continue;
1576 }
1577
1578 /* update existing nbrps */
1579 if (nbrp->flags != xn->flags ||
1580 nbrp->keepalive != xn->keepalive ||
1581 nbrp->gtsm_enabled != xn->gtsm_enabled ||
1582 nbrp->gtsm_hops != xn->gtsm_hops ||
1583 nbrp->auth.method != xn->auth.method ||
1584 strcmp(nbrp->auth.md5key, xn->auth.md5key) != 0)
1585 nbrp_changed = 1;
1586 else
1587 nbrp_changed = 0;
1588
1589 nbrp->keepalive = xn->keepalive;
1590 nbrp->gtsm_enabled = xn->gtsm_enabled;
1591 nbrp->gtsm_hops = xn->gtsm_hops;
1592 nbrp->auth.method = xn->auth.method;
1593 strlcpy(nbrp->auth.md5key, xn->auth.md5key,
1594 sizeof(nbrp->auth.md5key));
1595 nbrp->auth.md5key_len = xn->auth.md5key_len;
1596 nbrp->flags = xn->flags;
1597
1598 if (ldpd_process == PROC_LDP_ENGINE) {
1599 nbr = nbr_find_ldpid(nbrp->lsr_id.s_addr);
1600 if (nbr && nbrp_changed) {
1601 session_shutdown(nbr, S_SHUTDOWN, 0, 0);
1602 #ifdef __OpenBSD__
1603 pfkey_remove(nbr);
1604 nbr->auth.method = nbrp->auth.method;
1605 if (pfkey_establish(nbr, nbrp) == -1)
1606 fatalx("pfkey setup failed");
1607 #else
1608 nbr->auth.method = nbrp->auth.method;
1609 sock_set_md5sig((ldp_af_global_get(&global,
1610 nbr->af))->ldp_session_socket, nbr->af,
1611 &nbr->raddr, nbrp->auth.md5key);
1612 #endif
1613 if (nbr_session_active_role(nbr))
1614 nbr_establish_connection(nbr);
1615 }
1616 }
1617 }
1618 }
1619
1620 static void
1621 merge_l2vpns(struct ldpd_conf *conf, struct ldpd_conf *xconf)
1622 {
1623 struct l2vpn *l2vpn, *ltmp, *xl;
1624
1625 RB_FOREACH_SAFE(l2vpn, l2vpn_head, &conf->l2vpn_tree, ltmp) {
1626 /* find deleted l2vpns */
1627 if ((xl = l2vpn_find(xconf, l2vpn->name)) == NULL) {
1628 switch (ldpd_process) {
1629 case PROC_LDE_ENGINE:
1630 l2vpn_exit(l2vpn);
1631 break;
1632 case PROC_LDP_ENGINE:
1633 ldpe_l2vpn_exit(l2vpn);
1634 break;
1635 case PROC_MAIN:
1636 break;
1637 }
1638 RB_REMOVE(l2vpn_head, &conf->l2vpn_tree, l2vpn);
1639 l2vpn_del(l2vpn);
1640 }
1641 }
1642 RB_FOREACH_SAFE(xl, l2vpn_head, &xconf->l2vpn_tree, ltmp) {
1643 /* find new l2vpns */
1644 if ((l2vpn = l2vpn_find(conf, xl->name)) == NULL) {
1645 COPY(l2vpn, xl);
1646 RB_INSERT(l2vpn_head, &conf->l2vpn_tree, l2vpn);
1647 RB_INIT(l2vpn_if_head, &l2vpn->if_tree);
1648 RB_INIT(l2vpn_pw_head, &l2vpn->pw_tree);
1649 RB_INIT(l2vpn_pw_head, &l2vpn->pw_inactive_tree);
1650
1651 switch (ldpd_process) {
1652 case PROC_LDE_ENGINE:
1653 l2vpn_init(l2vpn);
1654 break;
1655 case PROC_LDP_ENGINE:
1656 ldpe_l2vpn_init(l2vpn);
1657 break;
1658 case PROC_MAIN:
1659 break;
1660 }
1661 }
1662
1663 /* update existing l2vpns */
1664 merge_l2vpn(conf, l2vpn, xl);
1665 }
1666 }
1667
1668 static void
1669 merge_l2vpn(struct ldpd_conf *xconf, struct l2vpn *l2vpn, struct l2vpn *xl)
1670 {
1671 struct l2vpn_if *lif, *ftmp, *xf;
1672 struct l2vpn_pw *pw, *ptmp, *xp;
1673 struct nbr *nbr;
1674 int reset_nbr, reinstall_pwfec, reinstall_tnbr;
1675 int previous_pw_type, previous_mtu;
1676
1677 previous_pw_type = l2vpn->pw_type;
1678 previous_mtu = l2vpn->mtu;
1679
1680 /* merge intefaces */
1681 RB_FOREACH_SAFE(lif, l2vpn_if_head, &l2vpn->if_tree, ftmp) {
1682 /* find deleted interfaces */
1683 if ((xf = l2vpn_if_find(xl, lif->ifname)) == NULL) {
1684 RB_REMOVE(l2vpn_if_head, &l2vpn->if_tree, lif);
1685 free(lif);
1686 }
1687 }
1688 RB_FOREACH_SAFE(xf, l2vpn_if_head, &xl->if_tree, ftmp) {
1689 /* find new interfaces */
1690 if ((lif = l2vpn_if_find(l2vpn, xf->ifname)) == NULL) {
1691 COPY(lif, xf);
1692 RB_INSERT(l2vpn_if_head, &l2vpn->if_tree, lif);
1693 lif->l2vpn = l2vpn;
1694
1695 switch (ldpd_process) {
1696 case PROC_LDP_ENGINE:
1697 case PROC_LDE_ENGINE:
1698 break;
1699 case PROC_MAIN:
1700 kif_redistribute(lif->ifname);
1701 break;
1702 }
1703 }
1704 }
1705
1706 /* merge active pseudowires */
1707 RB_FOREACH_SAFE(pw, l2vpn_pw_head, &l2vpn->pw_tree, ptmp) {
1708 /* find deleted active pseudowires */
1709 if ((xp = l2vpn_pw_find_active(xl, pw->ifname)) == NULL) {
1710 switch (ldpd_process) {
1711 case PROC_LDE_ENGINE:
1712 l2vpn_pw_exit(pw);
1713 break;
1714 case PROC_LDP_ENGINE:
1715 ldpe_l2vpn_pw_exit(pw);
1716 break;
1717 case PROC_MAIN:
1718 break;
1719 }
1720
1721 RB_REMOVE(l2vpn_pw_head, &l2vpn->pw_tree, pw);
1722 free(pw);
1723 }
1724 }
1725 RB_FOREACH_SAFE(xp, l2vpn_pw_head, &xl->pw_tree, ptmp) {
1726 /* find new active pseudowires */
1727 if ((pw = l2vpn_pw_find_active(l2vpn, xp->ifname)) == NULL) {
1728 COPY(pw, xp);
1729 RB_INSERT(l2vpn_pw_head, &l2vpn->pw_tree, pw);
1730 pw->l2vpn = l2vpn;
1731
1732 switch (ldpd_process) {
1733 case PROC_LDE_ENGINE:
1734 l2vpn_pw_init(pw);
1735 break;
1736 case PROC_LDP_ENGINE:
1737 ldpe_l2vpn_pw_init(pw);
1738 break;
1739 case PROC_MAIN:
1740 kif_redistribute(pw->ifname);
1741 break;
1742 }
1743 continue;
1744 }
1745
1746 /* update existing active pseudowire */
1747 if (pw->af != xp->af ||
1748 ldp_addrcmp(pw->af, &pw->addr, &xp->addr))
1749 reinstall_tnbr = 1;
1750 else
1751 reinstall_tnbr = 0;
1752
1753 /* changes that require a session restart */
1754 if ((pw->flags & (F_PW_STATUSTLV_CONF|F_PW_CWORD_CONF)) !=
1755 (xp->flags & (F_PW_STATUSTLV_CONF|F_PW_CWORD_CONF)))
1756 reset_nbr = 1;
1757 else
1758 reset_nbr = 0;
1759
1760 if (l2vpn->pw_type != xl->pw_type || l2vpn->mtu != xl->mtu ||
1761 pw->pwid != xp->pwid || reinstall_tnbr || reset_nbr ||
1762 pw->lsr_id.s_addr != xp->lsr_id.s_addr)
1763 reinstall_pwfec = 1;
1764 else
1765 reinstall_pwfec = 0;
1766
1767 if (ldpd_process == PROC_LDP_ENGINE) {
1768 if (reinstall_tnbr)
1769 ldpe_l2vpn_pw_exit(pw);
1770 if (reset_nbr) {
1771 nbr = nbr_find_ldpid(pw->lsr_id.s_addr);
1772 if (nbr && nbr->state == NBR_STA_OPER)
1773 session_shutdown(nbr, S_SHUTDOWN, 0, 0);
1774 }
1775 }
1776 if (ldpd_process == PROC_LDE_ENGINE && reinstall_pwfec)
1777 l2vpn_pw_exit(pw);
1778 pw->lsr_id = xp->lsr_id;
1779 pw->af = xp->af;
1780 pw->addr = xp->addr;
1781 pw->pwid = xp->pwid;
1782 strlcpy(pw->ifname, xp->ifname, sizeof(pw->ifname));
1783 pw->ifindex = xp->ifindex;
1784 if (xp->flags & F_PW_CWORD_CONF)
1785 pw->flags |= F_PW_CWORD_CONF;
1786 else
1787 pw->flags &= ~F_PW_CWORD_CONF;
1788 if (xp->flags & F_PW_STATUSTLV_CONF)
1789 pw->flags |= F_PW_STATUSTLV_CONF;
1790 else
1791 pw->flags &= ~F_PW_STATUSTLV_CONF;
1792 if (xp->flags & F_PW_STATIC_NBR_ADDR)
1793 pw->flags |= F_PW_STATIC_NBR_ADDR;
1794 else
1795 pw->flags &= ~F_PW_STATIC_NBR_ADDR;
1796 if (ldpd_process == PROC_LDP_ENGINE && reinstall_tnbr)
1797 ldpe_l2vpn_pw_init(pw);
1798 if (ldpd_process == PROC_LDE_ENGINE && reinstall_pwfec) {
1799 l2vpn->pw_type = xl->pw_type;
1800 l2vpn->mtu = xl->mtu;
1801 l2vpn_pw_init(pw);
1802 l2vpn->pw_type = previous_pw_type;
1803 l2vpn->mtu = previous_mtu;
1804 }
1805 }
1806
1807 /* merge inactive pseudowires */
1808 RB_FOREACH_SAFE(pw, l2vpn_pw_head, &l2vpn->pw_inactive_tree, ptmp) {
1809 /* find deleted inactive pseudowires */
1810 if ((xp = l2vpn_pw_find_inactive(xl, pw->ifname)) == NULL) {
1811 RB_REMOVE(l2vpn_pw_head, &l2vpn->pw_inactive_tree, pw);
1812 free(pw);
1813 }
1814 }
1815 RB_FOREACH_SAFE(xp, l2vpn_pw_head, &xl->pw_inactive_tree, ptmp) {
1816 /* find new inactive pseudowires */
1817 if ((pw = l2vpn_pw_find_inactive(l2vpn, xp->ifname)) == NULL) {
1818 COPY(pw, xp);
1819 RB_INSERT(l2vpn_pw_head, &l2vpn->pw_inactive_tree, pw);
1820 pw->l2vpn = l2vpn;
1821
1822 switch (ldpd_process) {
1823 case PROC_LDE_ENGINE:
1824 case PROC_LDP_ENGINE:
1825 break;
1826 case PROC_MAIN:
1827 kif_redistribute(pw->ifname);
1828 break;
1829 }
1830 continue;
1831 }
1832
1833 /* update existing inactive pseudowire */
1834 pw->lsr_id.s_addr = xp->lsr_id.s_addr;
1835 pw->af = xp->af;
1836 pw->addr = xp->addr;
1837 pw->pwid = xp->pwid;
1838 strlcpy(pw->ifname, xp->ifname, sizeof(pw->ifname));
1839 pw->ifindex = xp->ifindex;
1840 pw->flags = xp->flags;
1841 }
1842
1843 l2vpn->pw_type = xl->pw_type;
1844 l2vpn->mtu = xl->mtu;
1845 strlcpy(l2vpn->br_ifname, xl->br_ifname, sizeof(l2vpn->br_ifname));
1846 l2vpn->br_ifindex = xl->br_ifindex;
1847 }
1848
1849 struct ldpd_conf *
1850 config_new_empty(void)
1851 {
1852 struct ldpd_conf *xconf;
1853
1854 xconf = calloc(1, sizeof(*xconf));
1855 if (xconf == NULL)
1856 fatal(NULL);
1857
1858 RB_INIT(iface_head, &xconf->iface_tree);
1859 RB_INIT(tnbr_head, &xconf->tnbr_tree);
1860 RB_INIT(nbrp_head, &xconf->nbrp_tree);
1861 RB_INIT(l2vpn_head, &xconf->l2vpn_tree);
1862
1863 /* set default values */
1864 ldp_config_reset(xconf);
1865
1866 return (xconf);
1867 }
1868
1869 void
1870 config_clear(struct ldpd_conf *conf)
1871 {
1872 struct ldpd_conf *xconf;
1873
1874 /*
1875 * Merge current config with an empty config, this will deactivate
1876 * and deallocate all the interfaces, pseudowires and so on. Before
1877 * merging, copy the router-id and other variables to avoid some
1878 * unnecessary operations, like trying to reset the neighborships.
1879 */
1880 xconf = config_new_empty();
1881 xconf->ipv4 = conf->ipv4;
1882 xconf->ipv6 = conf->ipv6;
1883 xconf->rtr_id = conf->rtr_id;
1884 xconf->trans_pref = conf->trans_pref;
1885 xconf->flags = conf->flags;
1886 merge_config(conf, xconf);
1887 free(xconf);
1888 free(conf);
1889 }
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