bgpd.c revision 1.188 
1/*	$OpenBSD: bgpd.c,v 1.188 2017/01/24 04:22:42 benno Exp $ */
2
3/*
4 * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19#include <sys/types.h>
20#include <sys/socket.h>
21#include <sys/wait.h>
22#include <netinet/in.h>
23#include <arpa/inet.h>
24#include <err.h>
25#include <errno.h>
26#include <fcntl.h>
27#include <poll.h>
28#include <pwd.h>
29#include <signal.h>
30#include <stdio.h>
31#include <stdlib.h>
32#include <string.h>
33#include <syslog.h>
34#include <unistd.h>
35
36#include "bgpd.h"
37#include "mrt.h"
38#include "session.h"
39#include "log.h"
40
41void		sighdlr(int);
42__dead void	usage(void);
43int		main(int, char *[]);
44pid_t		start_child(enum bgpd_process, char *, int, int, int);
45int		send_filterset(struct imsgbuf *, struct filter_set_head *);
46int		reconfigure(char *, struct bgpd_config *, struct peer **);
47int		dispatch_imsg(struct imsgbuf *, int, struct bgpd_config *);
48int		control_setup(struct bgpd_config *);
49int		imsg_send_sockets(struct imsgbuf *, struct imsgbuf *);
50
51int			 rfd = -1;
52int			 cflags;
53volatile sig_atomic_t	 mrtdump;
54volatile sig_atomic_t	 quit;
55volatile sig_atomic_t	 reconfig;
56pid_t			 reconfpid;
57int			 reconfpending;
58struct imsgbuf		*ibuf_se;
59struct imsgbuf		*ibuf_rde;
60struct rib_names	 ribnames = SIMPLEQ_HEAD_INITIALIZER(ribnames);
61char			*cname;
62char			*rcname;
63
64void
65sighdlr(int sig)
66{
67	switch (sig) {
68	case SIGTERM:
69	case SIGINT:
70		quit = 1;
71		break;
72	case SIGHUP:
73		reconfig = 1;
74		break;
75	case SIGALRM:
76	case SIGUSR1:
77		mrtdump = 1;
78		break;
79	}
80}
81
82__dead void
83usage(void)
84{
85	extern char *__progname;
86
87	fprintf(stderr, "usage: %s [-cdnv] [-D macro=value] [-f file]\n",
88	    __progname);
89	exit(1);
90}
91
92#define PFD_PIPE_SESSION	0
93#define PFD_PIPE_ROUTE		1
94#define PFD_SOCK_ROUTE		2
95#define POLL_MAX		3
96#define MAX_TIMEOUT		3600
97
98int	 cmd_opts;
99
100int
101main(int argc, char *argv[])
102{
103	struct bgpd_config	*conf;
104	struct peer		*peer_l, *p;
105	struct pollfd		 pfd[POLL_MAX];
106	pid_t			 io_pid = 0, rde_pid = 0, pid;
107	char			*conffile;
108	char			*saved_argv0;
109	int			 debug = 0;
110	int			 rflag = 0, sflag = 0;
111	int			 ch, timeout, status;
112	int			 pipe_m2s[2];
113	int			 pipe_m2r[2];
114
115	conffile = CONFFILE;
116	bgpd_process = PROC_MAIN;
117
118	log_init(1, LOG_DAEMON);	/* log to stderr until daemonized */
119	log_procinit(log_procnames[bgpd_process]);
120	log_setverbose(1);
121
122	saved_argv0 = argv[0];
123	if (saved_argv0 == NULL)
124		saved_argv0 = "bgpd";
125
126	conf = new_config();
127	peer_l = NULL;
128
129	while ((ch = getopt(argc, argv, "cdD:f:nRSv")) != -1) {
130		switch (ch) {
131		case 'c':
132			cmd_opts |= BGPD_OPT_FORCE_DEMOTE;
133			break;
134		case 'd':
135			debug = 1;
136			break;
137		case 'D':
138			if (cmdline_symset(optarg) < 0)
139				log_warnx("could not parse macro definition %s",
140				    optarg);
141			break;
142		case 'f':
143			conffile = optarg;
144			break;
145		case 'n':
146			cmd_opts |= BGPD_OPT_NOACTION;
147			break;
148		case 'v':
149			if (cmd_opts & BGPD_OPT_VERBOSE)
150				cmd_opts |= BGPD_OPT_VERBOSE2;
151			cmd_opts |= BGPD_OPT_VERBOSE;
152			break;
153		case 'R':
154			rflag = 1;
155			break;
156		case 'S':
157			sflag = 1;
158			break;
159		default:
160			usage();
161			/* NOTREACHED */
162		}
163	}
164
165	argc -= optind;
166	argv += optind;
167	if (argc > 0 || (sflag && rflag))
168		usage();
169
170	if (cmd_opts & BGPD_OPT_NOACTION) {
171		if (parse_config(conffile, conf, &peer_l))
172			exit(1);
173
174		if (cmd_opts & BGPD_OPT_VERBOSE)
175			print_config(conf, &ribnames, &conf->networks, peer_l,
176			    conf->filters, conf->mrt, &conf->rdomains);
177		else
178			fprintf(stderr, "configuration OK\n");
179		exit(0);
180	}
181
182	if (rflag)
183		rde_main(debug, cmd_opts & BGPD_OPT_VERBOSE);
184	else if (sflag)
185		session_main(debug, cmd_opts & BGPD_OPT_VERBOSE);
186
187	if (geteuid())
188		errx(1, "need root privileges");
189
190	if (getpwnam(BGPD_USER) == NULL)
191		errx(1, "unknown user %s", BGPD_USER);
192
193	log_init(debug, LOG_DAEMON);
194	log_setverbose(cmd_opts & BGPD_OPT_VERBOSE);
195
196	if (!debug)
197		daemon(1, 0);
198
199	log_info("startup");
200
201	if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK,
202	    PF_UNSPEC, pipe_m2s) == -1)
203		fatal("socketpair");
204	if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK,
205	    PF_UNSPEC, pipe_m2r) == -1)
206		fatal("socketpair");
207
208	/* fork children */
209	rde_pid = start_child(PROC_RDE, saved_argv0, pipe_m2r[1], debug,
210	    cmd_opts & BGPD_OPT_VERBOSE);
211	io_pid = start_child(PROC_SE, saved_argv0, pipe_m2s[1], debug,
212	    cmd_opts & BGPD_OPT_VERBOSE);
213
214	signal(SIGTERM, sighdlr);
215	signal(SIGINT, sighdlr);
216	signal(SIGHUP, sighdlr);
217	signal(SIGALRM, sighdlr);
218	signal(SIGUSR1, sighdlr);
219	signal(SIGPIPE, SIG_IGN);
220
221	if ((ibuf_se = malloc(sizeof(struct imsgbuf))) == NULL ||
222	    (ibuf_rde = malloc(sizeof(struct imsgbuf))) == NULL)
223		fatal(NULL);
224	imsg_init(ibuf_se, pipe_m2s[0]);
225	imsg_init(ibuf_rde, pipe_m2r[0]);
226	mrt_init(ibuf_rde, ibuf_se);
227	if ((rfd = kr_init()) == -1)
228		quit = 1;
229
230	/*
231	 * rpath, read config file
232	 * cpath, unlink control socket
233	 * fattr, chmod on control socket
234	 * wpath, needed if we are doing mrt dumps
235	 *
236	 * pledge placed here because kr_init() does a setsockopt on the
237	 * routing socket thats not allowed at all.
238	 */
239#if 0
240	/*
241	 * disabled because we do ioctls on /dev/pf and SIOCSIFGATTR
242	 * this needs some redesign of bgpd to be fixed.
243	 */
244	if (pledge("stdio rpath wpath cpath fattr unix route recvfd sendfd",
245	    NULL) == -1)
246		fatal("pledge");
247#endif
248
249	if (imsg_send_sockets(ibuf_se, ibuf_rde))
250		fatal("could not establish imsg links");
251	quit = reconfigure(conffile, conf, &peer_l);
252	if (pftable_clear_all() != 0)
253		quit = 1;
254
255	while (quit == 0) {
256		bzero(pfd, sizeof(pfd));
257
258		set_pollfd(&pfd[PFD_PIPE_SESSION], ibuf_se);
259		set_pollfd(&pfd[PFD_PIPE_ROUTE], ibuf_rde);
260
261		pfd[PFD_SOCK_ROUTE].fd = rfd;
262		pfd[PFD_SOCK_ROUTE].events = POLLIN;
263
264		timeout = mrt_timeout(conf->mrt);
265		if (timeout > MAX_TIMEOUT)
266			timeout = MAX_TIMEOUT;
267
268		if (poll(pfd, POLL_MAX, timeout * 1000) == -1)
269			if (errno != EINTR) {
270				log_warn("poll error");
271				quit = 1;
272			}
273
274		if (handle_pollfd(&pfd[PFD_PIPE_SESSION], ibuf_se) == -1) {
275			log_warnx("main: Lost connection to SE");
276			msgbuf_clear(&ibuf_se->w);
277			free(ibuf_se);
278			ibuf_se = NULL;
279			quit = 1;
280		} else {
281			if (dispatch_imsg(ibuf_se, PFD_PIPE_SESSION, conf) ==
282			    -1)
283				quit = 1;
284		}
285
286		if (handle_pollfd(&pfd[PFD_PIPE_ROUTE], ibuf_rde) == -1) {
287			log_warnx("main: Lost connection to RDE");
288			msgbuf_clear(&ibuf_rde->w);
289			free(ibuf_rde);
290			ibuf_rde = NULL;
291			quit = 1;
292		} else {
293			if (dispatch_imsg(ibuf_rde, PFD_PIPE_ROUTE, conf) ==
294			    -1)
295				quit = 1;
296		}
297
298		if (pfd[PFD_SOCK_ROUTE].revents & POLLIN) {
299			if (kr_dispatch_msg() == -1)
300				quit = 1;
301		}
302
303		if (reconfig) {
304			u_int	error;
305
306			reconfig = 0;
307			switch (reconfigure(conffile, conf, &peer_l)) {
308			case -1:	/* fatal error */
309				quit = 1;
310				break;
311			case 0:		/* all OK */
312				error = 0;
313				break;
314			case 2:
315				error = CTL_RES_PENDING;
316				break;
317			default:	/* parse error */
318				error = CTL_RES_PARSE_ERROR;
319				break;
320			}
321			if (reconfpid != 0) {
322				send_imsg_session(IMSG_CTL_RESULT, reconfpid,
323				    &error, sizeof(error));
324				reconfpid = 0;
325			}
326		}
327
328		if (mrtdump) {
329			mrtdump = 0;
330			mrt_handler(conf->mrt);
331		}
332	}
333
334	/* close pipes */
335	if (ibuf_se) {
336		msgbuf_clear(&ibuf_se->w);
337		close(ibuf_se->fd);
338		free(ibuf_se);
339	}
340	if (ibuf_rde) {
341		msgbuf_clear(&ibuf_rde->w);
342		close(ibuf_rde->fd);
343		free(ibuf_rde);
344	}
345
346	while ((p = peer_l) != NULL) {
347		peer_l = p->next;
348		free(p);
349	}
350
351	control_cleanup(conf->csock);
352	control_cleanup(conf->rcsock);
353	carp_demote_shutdown();
354	kr_shutdown(conf->fib_priority);
355	pftable_clear_all();
356
357	free_config(conf);
358
359	log_debug("waiting for children to terminate");
360	do {
361		pid = wait(&status);
362		if (pid == -1) {
363			if (errno != EINTR && errno != ECHILD)
364				fatal("wait");
365		} else if (WIFSIGNALED(status))
366			log_warnx("%s terminated; signal %d",
367			    (pid == rde_pid) ? "route decision engine" :
368			    "session engine", WTERMSIG(status));
369	} while (pid != -1 || (pid == -1 && errno == EINTR));
370
371	free(rcname);
372	free(cname);
373
374	log_info("terminating");
375	return (0);
376}
377
378pid_t
379start_child(enum bgpd_process p, char *argv0, int fd, int debug, int verbose)
380{
381	char *argv[5];
382	int argc = 0;
383	pid_t pid;
384
385	switch (pid = fork()) {
386	case -1:
387		fatal("cannot fork");
388	case 0:
389		break;
390	default:
391		close(fd);
392		return (pid);
393	}
394
395	if (dup2(fd, 3) == -1)
396		fatal("cannot setup imsg fd");
397
398	argv[argc++] = argv0;
399	switch (p) {
400	case PROC_MAIN:
401		fatalx("Can not start main process");
402	case PROC_RDE:
403		argv[argc++] = "-R";
404		break;
405	case PROC_SE:
406		argv[argc++] = "-S";
407		break;
408	}
409	if (debug)
410		argv[argc++] = "-d";
411	if (verbose)
412		argv[argc++] = "-v";
413	argv[argc++] = NULL;
414
415	execvp(argv0, argv);
416	fatal("execvp");
417}
418
419int
420send_filterset(struct imsgbuf *i, struct filter_set_head *set)
421{
422	struct filter_set	*s;
423
424	TAILQ_FOREACH(s, set, entry)
425		if (imsg_compose(i, IMSG_FILTER_SET, 0, 0, -1, s,
426		    sizeof(struct filter_set)) == -1)
427			return (-1);
428	return (0);
429}
430
431int
432reconfigure(char *conffile, struct bgpd_config *conf, struct peer **peer_l)
433{
434	struct peer		*p;
435	struct filter_rule	*r;
436	struct listen_addr	*la;
437	struct rde_rib		*rr;
438	struct rdomain		*rd;
439
440	if (reconfpending) {
441		log_info("previous reload still running");
442		return (2);
443	}
444	reconfpending = 2;	/* one per child */
445
446	log_info("rereading config");
447	if (parse_config(conffile, conf, peer_l)) {
448		log_warnx("config file %s has errors, not reloading",
449		    conffile);
450		reconfpending = 0;
451		return (1);
452	}
453
454	cflags = conf->flags;
455	prepare_listeners(conf);
456
457	/* start reconfiguration */
458	if (imsg_compose(ibuf_se, IMSG_RECONF_CONF, 0, 0, -1,
459	    conf, sizeof(struct bgpd_config)) == -1)
460		return (-1);
461	if (imsg_compose(ibuf_rde, IMSG_RECONF_CONF, 0, 0, -1,
462	    conf, sizeof(struct bgpd_config)) == -1)
463		return (-1);
464
465	TAILQ_FOREACH(la, conf->listen_addrs, entry) {
466		if (imsg_compose(ibuf_se, IMSG_RECONF_LISTENER, 0, 0, la->fd,
467		    la, sizeof(struct listen_addr)) == -1)
468			return (-1);
469		la->fd = -1;
470	}
471
472	if (control_setup(conf) == -1)
473		return (-1);
474
475	/* adjust fib syncing on reload */
476	ktable_preload();
477
478	/* RIBs for the RDE */
479	while ((rr = SIMPLEQ_FIRST(&ribnames))) {
480		SIMPLEQ_REMOVE_HEAD(&ribnames, entry);
481		if (ktable_update(rr->rtableid, rr->name, NULL,
482		    rr->flags, conf->fib_priority) == -1) {
483			log_warnx("failed to load rdomain %d",
484			    rr->rtableid);
485			return (-1);
486		}
487		if (imsg_compose(ibuf_rde, IMSG_RECONF_RIB, 0, 0, -1,
488		    rr, sizeof(struct rde_rib)) == -1)
489			return (-1);
490		free(rr);
491	}
492
493	/* send peer list to the SE */
494	for (p = *peer_l; p != NULL; p = p->next) {
495		if (imsg_compose(ibuf_se, IMSG_RECONF_PEER, p->conf.id, 0, -1,
496		    &p->conf, sizeof(struct peer_config)) == -1)
497			return (-1);
498	}
499
500	/* networks go via kroute to the RDE */
501	if (kr_net_reload(0, &conf->networks))
502		return (-1);
503
504	/* filters for the RDE */
505	while ((r = TAILQ_FIRST(conf->filters)) != NULL) {
506		TAILQ_REMOVE(conf->filters, r, entry);
507		if (imsg_compose(ibuf_rde, IMSG_RECONF_FILTER, 0, 0, -1,
508		    r, sizeof(struct filter_rule)) == -1)
509			return (-1);
510		if (send_filterset(ibuf_rde, &r->set) == -1)
511			return (-1);
512		filterset_free(&r->set);
513		free(r);
514	}
515
516	while ((rd = SIMPLEQ_FIRST(&conf->rdomains)) != NULL) {
517		SIMPLEQ_REMOVE_HEAD(&conf->rdomains, entry);
518		if (ktable_update(rd->rtableid, rd->descr, rd->ifmpe,
519		    rd->flags, conf->fib_priority) == -1) {
520			log_warnx("failed to load rdomain %d",
521			    rd->rtableid);
522			return (-1);
523		}
524		/* networks go via kroute to the RDE */
525		if (kr_net_reload(rd->rtableid, &rd->net_l))
526			return (-1);
527
528		if (imsg_compose(ibuf_rde, IMSG_RECONF_RDOMAIN, 0, 0, -1,
529		    rd, sizeof(*rd)) == -1)
530			return (-1);
531
532		/* export targets */
533		if (imsg_compose(ibuf_rde, IMSG_RECONF_RDOMAIN_EXPORT, 0, 0,
534		    -1, NULL, 0) == -1)
535			return (-1);
536		if (send_filterset(ibuf_rde, &rd->export) == -1)
537			return (-1);
538		filterset_free(&rd->export);
539
540		/* import targets */
541		if (imsg_compose(ibuf_rde, IMSG_RECONF_RDOMAIN_IMPORT, 0, 0,
542		    -1, NULL, 0) == -1)
543			return (-1);
544		if (send_filterset(ibuf_rde, &rd->import) == -1)
545			return (-1);
546		filterset_free(&rd->import);
547
548		if (imsg_compose(ibuf_rde, IMSG_RECONF_RDOMAIN_DONE, 0, 0,
549		    -1, NULL, 0) == -1)
550			return (-1);
551
552		free(rd);
553	}
554
555	/* signal the SE first then the RDE to activate the new config */
556	if (imsg_compose(ibuf_se, IMSG_RECONF_DONE, 0, 0, -1, NULL, 0) == -1)
557		return (-1);
558
559	/* mrt changes can be sent out of bound */
560	mrt_reconfigure(conf->mrt);
561	return (0);
562}
563
564int
565dispatch_imsg(struct imsgbuf *ibuf, int idx, struct bgpd_config *conf)
566{
567	struct imsg		 imsg;
568	ssize_t			 n;
569	int			 rv, verbose;
570
571	rv = 0;
572	while (ibuf) {
573		if ((n = imsg_get(ibuf, &imsg)) == -1)
574			return (-1);
575
576		if (n == 0)
577			break;
578
579		switch (imsg.hdr.type) {
580		case IMSG_KROUTE_CHANGE:
581			if (idx != PFD_PIPE_ROUTE)
582				log_warnx("route request not from RDE");
583			else if (imsg.hdr.len != IMSG_HEADER_SIZE +
584			    sizeof(struct kroute_full))
585				log_warnx("wrong imsg len");
586			else if (kr_change(imsg.hdr.peerid, imsg.data,
587			    conf->fib_priority))
588				rv = -1;
589			break;
590		case IMSG_KROUTE_DELETE:
591			if (idx != PFD_PIPE_ROUTE)
592				log_warnx("route request not from RDE");
593			else if (imsg.hdr.len != IMSG_HEADER_SIZE +
594			    sizeof(struct kroute_full))
595				log_warnx("wrong imsg len");
596			else if (kr_delete(imsg.hdr.peerid, imsg.data,
597			    conf->fib_priority))
598				rv = -1;
599			break;
600		case IMSG_NEXTHOP_ADD:
601			if (idx != PFD_PIPE_ROUTE)
602				log_warnx("nexthop request not from RDE");
603			else if (imsg.hdr.len != IMSG_HEADER_SIZE +
604			    sizeof(struct bgpd_addr))
605				log_warnx("wrong imsg len");
606			else if (kr_nexthop_add(imsg.hdr.peerid, imsg.data) ==
607			    -1)
608				rv = -1;
609			break;
610		case IMSG_NEXTHOP_REMOVE:
611			if (idx != PFD_PIPE_ROUTE)
612				log_warnx("nexthop request not from RDE");
613			else if (imsg.hdr.len != IMSG_HEADER_SIZE +
614			    sizeof(struct bgpd_addr))
615				log_warnx("wrong imsg len");
616			else
617				kr_nexthop_delete(imsg.hdr.peerid, imsg.data);
618			break;
619		case IMSG_PFTABLE_ADD:
620			if (idx != PFD_PIPE_ROUTE)
621				log_warnx("pftable request not from RDE");
622			else
623				if (imsg.hdr.len != IMSG_HEADER_SIZE +
624				    sizeof(struct pftable_msg))
625					log_warnx("wrong imsg len");
626				else if (pftable_addr_add(imsg.data) != 0)
627					rv = -1;
628			break;
629		case IMSG_PFTABLE_REMOVE:
630			if (idx != PFD_PIPE_ROUTE)
631				log_warnx("pftable request not from RDE");
632			else
633				if (imsg.hdr.len != IMSG_HEADER_SIZE +
634				    sizeof(struct pftable_msg))
635					log_warnx("wrong imsg len");
636				else if (pftable_addr_remove(imsg.data) != 0)
637					rv = -1;
638			break;
639		case IMSG_PFTABLE_COMMIT:
640			if (idx != PFD_PIPE_ROUTE)
641				log_warnx("pftable request not from RDE");
642			else
643				if (imsg.hdr.len != IMSG_HEADER_SIZE)
644					log_warnx("wrong imsg len");
645				else if (pftable_commit() != 0)
646					rv = -1;
647			break;
648		case IMSG_CTL_RELOAD:
649			if (idx != PFD_PIPE_SESSION)
650				log_warnx("reload request not from SE");
651			else {
652				reconfig = 1;
653				reconfpid = imsg.hdr.pid;
654			}
655			break;
656		case IMSG_CTL_FIB_COUPLE:
657			if (idx != PFD_PIPE_SESSION)
658				log_warnx("couple request not from SE");
659			else
660				kr_fib_couple(imsg.hdr.peerid,
661				    conf->fib_priority);
662			break;
663		case IMSG_CTL_FIB_DECOUPLE:
664			if (idx != PFD_PIPE_SESSION)
665				log_warnx("decouple request not from SE");
666			else
667				kr_fib_decouple(imsg.hdr.peerid,
668				    conf->fib_priority);
669			break;
670		case IMSG_CTL_KROUTE:
671		case IMSG_CTL_KROUTE_ADDR:
672		case IMSG_CTL_SHOW_NEXTHOP:
673		case IMSG_CTL_SHOW_INTERFACE:
674		case IMSG_CTL_SHOW_FIB_TABLES:
675			if (idx != PFD_PIPE_SESSION)
676				log_warnx("kroute request not from SE");
677			else
678				kr_show_route(&imsg);
679			break;
680		case IMSG_IFINFO:
681			if (idx != PFD_PIPE_SESSION)
682				log_warnx("IFINFO request not from SE");
683			else if (imsg.hdr.len != IMSG_HEADER_SIZE + IFNAMSIZ)
684				log_warnx("IFINFO request with wrong len");
685			else
686				kr_ifinfo(imsg.data);
687			break;
688		case IMSG_DEMOTE:
689			if (idx != PFD_PIPE_SESSION)
690				log_warnx("demote request not from SE");
691			else if (imsg.hdr.len != IMSG_HEADER_SIZE +
692			    sizeof(struct demote_msg))
693				log_warnx("DEMOTE request with wrong len");
694			else {
695				struct demote_msg	*msg;
696
697				msg = imsg.data;
698				carp_demote_set(msg->demote_group, msg->level);
699			}
700			break;
701		case IMSG_CTL_LOG_VERBOSE:
702			/* already checked by SE */
703			memcpy(&verbose, imsg.data, sizeof(verbose));
704			log_setverbose(verbose);
705			break;
706		case IMSG_RECONF_DONE:
707			if (reconfpending == 0)
708				log_warnx("unexpected RECONF_DONE received");
709			else if (reconfpending == 2) {
710				imsg_compose(ibuf_rde, IMSG_RECONF_DONE, 0,
711				    0, -1, NULL, 0);
712
713				/* finally fix kroute information */
714				ktable_postload(conf->fib_priority);
715
716				/* redistribute list needs to be reloaded too */
717				kr_reload();
718			}
719			reconfpending--;
720			break;
721		default:
722			break;
723		}
724		imsg_free(&imsg);
725		if (rv != 0)
726			return (rv);
727	}
728	return (0);
729}
730
731void
732send_nexthop_update(struct kroute_nexthop *msg)
733{
734	char	*gw = NULL;
735
736	if (msg->gateway.aid)
737		if (asprintf(&gw, ": via %s",
738		    log_addr(&msg->gateway)) == -1) {
739			log_warn("send_nexthop_update");
740			quit = 1;
741		}
742
743	log_debug("nexthop %s now %s%s%s", log_addr(&msg->nexthop),
744	    msg->valid ? "valid" : "invalid",
745	    msg->connected ? ": directly connected" : "",
746	    msg->gateway.aid ? gw : "");
747
748	free(gw);
749
750	if (imsg_compose(ibuf_rde, IMSG_NEXTHOP_UPDATE, 0, 0, -1,
751	    msg, sizeof(struct kroute_nexthop)) == -1)
752		quit = 1;
753}
754
755void
756send_imsg_session(int type, pid_t pid, void *data, u_int16_t datalen)
757{
758	imsg_compose(ibuf_se, type, 0, pid, -1, data, datalen);
759}
760
761int
762send_network(int type, struct network_config *net, struct filter_set_head *h)
763{
764	if (imsg_compose(ibuf_rde, type, 0, 0, -1, net,
765	    sizeof(struct network_config)) == -1)
766		return (-1);
767	/* networks that get deleted don't need to send the filter set */
768	if (type == IMSG_NETWORK_REMOVE)
769		return (0);
770	if (send_filterset(ibuf_rde, h) == -1)
771		return (-1);
772	if (imsg_compose(ibuf_rde, IMSG_NETWORK_DONE, 0, 0, -1, NULL, 0) == -1)
773		return (-1);
774
775	return (0);
776}
777
778int
779bgpd_filternexthop(struct kroute *kr, struct kroute6 *kr6)
780{
781	/* kernel routes are never filtered */
782	if (kr && kr->flags & F_KERNEL && kr->prefixlen != 0)
783		return (0);
784	if (kr6 && kr6->flags & F_KERNEL && kr6->prefixlen != 0)
785		return (0);
786
787	if (cflags & BGPD_FLAG_NEXTHOP_BGP) {
788		if (kr && kr->flags & F_BGPD_INSERTED)
789			return (0);
790		if (kr6 && kr6->flags & F_BGPD_INSERTED)
791			return (0);
792	}
793
794	if (cflags & BGPD_FLAG_NEXTHOP_DEFAULT) {
795		if (kr && kr->prefixlen == 0)
796			return (0);
797		if (kr6 && kr6->prefixlen == 0)
798			return (0);
799	}
800
801	return (1);
802}
803
804int
805control_setup(struct bgpd_config *conf)
806{
807	int fd, restricted;
808
809	/* control socket is outside chroot */
810	if (!cname || strcmp(cname, conf->csock)) {
811		if (cname) {
812			control_cleanup(cname);
813			free(cname);
814		}
815		if ((cname = strdup(conf->csock)) == NULL)
816			fatal("strdup");
817		if ((fd = control_init(0, cname)) == -1)
818			fatalx("control socket setup failed");
819		if (control_listen(fd) == -1)
820			fatalx("control socket setup failed");
821		restricted = 0;
822		if (imsg_compose(ibuf_se, IMSG_RECONF_CTRL, 0, 0, fd,
823		    &restricted, sizeof(restricted)) == -1)
824			return (-1);
825	}
826	if (!conf->rcsock) {
827		/* remove restricted socket */
828		control_cleanup(rcname);
829		free(rcname);
830		rcname = NULL;
831	} else if (!rcname || strcmp(rcname, conf->rcsock)) {
832		if (rcname) {
833			control_cleanup(rcname);
834			free(rcname);
835		}
836		if ((rcname = strdup(conf->rcsock)) == NULL)
837			fatal("strdup");
838		if ((fd = control_init(1, rcname)) == -1)
839			fatalx("control socket setup failed");
840		if (control_listen(fd) == -1)
841			fatalx("control socket setup failed");
842		restricted = 1;
843		if (imsg_compose(ibuf_se, IMSG_RECONF_CTRL, 0, 0, fd,
844		    &restricted, sizeof(restricted)) == -1)
845			return (-1);
846	}
847	return (0);
848}
849
850void
851set_pollfd(struct pollfd *pfd, struct imsgbuf *i)
852{
853	if (i == NULL || i->fd == -1) {
854		pfd->fd = -1;
855		return;
856	}
857	pfd->fd = i->fd;
858	pfd->events = POLLIN;
859	if (i->w.queued > 0)
860		pfd->events |= POLLOUT;
861}
862
863int
864handle_pollfd(struct pollfd *pfd, struct imsgbuf *i)
865{
866	ssize_t n;
867
868	if (i == NULL)
869		return (0);
870
871	if (pfd->revents & POLLOUT)
872		if (msgbuf_write(&i->w) <= 0 && errno != EAGAIN) {
873			log_warn("imsg write error");
874			close(i->fd);
875			i->fd = -1;
876			return (-1);
877		}
878
879	if (pfd->revents & POLLIN) {
880		if ((n = imsg_read(i)) == -1 && errno != EAGAIN) {
881			log_warn("imsg read error");
882			close(i->fd);
883			i->fd = -1;
884			return (-1);
885		}
886		if (n == 0) {
887			log_warnx("peer closed imsg connection");
888			close(i->fd);
889			i->fd = -1;
890			return (-1);
891		}
892	}
893	return (0);
894}
895
896int
897imsg_send_sockets(struct imsgbuf *se, struct imsgbuf *rde)
898{
899	int pipe_s2r[2];
900	int pipe_s2r_ctl[2];
901
902	if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK,
903	     PF_UNSPEC, pipe_s2r) == -1)
904		return (-1);
905	if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK,
906	     PF_UNSPEC, pipe_s2r_ctl) == -1)
907		return (-1);
908
909	if (imsg_compose(se, IMSG_SOCKET_CONN, 0, 0, pipe_s2r[0],
910	    NULL, 0) == -1)
911		return (-1);
912	if (imsg_compose(rde, IMSG_SOCKET_CONN, 0, 0, pipe_s2r[1],
913	    NULL, 0) == -1)
914		return (-1);
915
916	if (imsg_compose(se, IMSG_SOCKET_CONN_CTL, 0, 0, pipe_s2r_ctl[0],
917	    NULL, 0) == -1)
918		return (-1);
919	if (imsg_compose(rde, IMSG_SOCKET_CONN_CTL, 0, 0, pipe_s2r_ctl[1],
920	    NULL, 0) == -1)
921		return (-1);
922
923	return (0);
924}
925