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mqueues: Hook into the build system.
[dragonfly.git] / usr.sbin / rtadvd / rtadvd.c
blob69b98ed382c4f6bf5f643b5e69280f3dab405d20
1 /* $KAME: rtadvd.c,v 1.50 2001/02/04 06:15:15 itojun Exp $ */
2
3 /*
4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the project nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * $FreeBSD: src/usr.sbin/rtadvd/rtadvd.c,v 1.3.2.4 2003/04/05 10:31:58 ume Exp $
32 * $DragonFly: src/usr.sbin/rtadvd/rtadvd.c,v 1.6 2005/12/05 00:56:37 swildner Exp $
33 */
34
35 #include <sys/param.h>
36 #include <sys/socket.h>
37 #include <sys/uio.h>
38 #include <sys/time.h>
39 #include <sys/queue.h>
40
41 #include <net/if.h>
42 #include <net/route.h>
43 #include <net/if_dl.h>
44 #include <netinet/in.h>
45 #include <netinet/ip6.h>
46 #include <netinet6/ip6_var.h>
47 #include <netinet/icmp6.h>
48
49 #include <arpa/inet.h>
50
51 #include <time.h>
52 #include <unistd.h>
53 #include <stdio.h>
54 #include <stdlib.h>
55 #include <err.h>
56 #include <errno.h>
57 #include <string.h>
58 #include <stdlib.h>
59 #include <syslog.h>
60 #include "rtadvd.h"
61 #include "rrenum.h"
62 #include "advcap.h"
63 #include "timer.h"
64 #include "if.h"
65 #include "config.h"
66 #include "dump.h"
67
68 struct msghdr rcvmhdr;
69 static u_char *rcvcmsgbuf;
70 static size_t rcvcmsgbuflen;
71 static u_char *sndcmsgbuf = NULL;
72 static size_t sndcmsgbuflen;
73 static int do_dump;
74 static int do_die;
75 struct msghdr sndmhdr;
76 struct iovec rcviov[2];
77 struct iovec sndiov[2];
78 struct sockaddr_in6 from;
79 struct sockaddr_in6 sin6_allnodes = {sizeof(sin6_allnodes), AF_INET6};
80 struct in6_addr in6a_site_allrouters;
81 static char *dumpfilename = "/var/run/rtadvd.dump"; /* XXX: should be configurable */
82 static char *pidfilename = "/var/run/rtadvd.pid"; /* should be configurable */
83 static char *mcastif;
84 int sock;
85 int rtsock = -1;
86 #ifdef MIP6
87 int mobileip6 = 0;
88 #endif
89 int accept_rr = 0;
90 int dflag = 0, sflag = 0;
91
92 u_char *conffile = NULL;
93
94 struct rainfo *ralist = NULL;
95 struct nd_optlist {
96 struct nd_optlist *next;
97 struct nd_opt_hdr *opt;
98 };
99 union nd_opts {
100 struct nd_opt_hdr *nd_opt_array[7];
101 struct {
102 struct nd_opt_hdr *zero;
103 struct nd_opt_hdr *src_lladdr;
104 struct nd_opt_hdr *tgt_lladdr;
105 struct nd_opt_prefix_info *pi;
106 struct nd_opt_rd_hdr *rh;
107 struct nd_opt_mtu *mtu;
108 struct nd_optlist *list;
109 } nd_opt_each;
110 };
111 #define nd_opts_src_lladdr nd_opt_each.src_lladdr
112 #define nd_opts_tgt_lladdr nd_opt_each.tgt_lladdr
113 #define nd_opts_pi nd_opt_each.pi
114 #define nd_opts_rh nd_opt_each.rh
115 #define nd_opts_mtu nd_opt_each.mtu
116 #define nd_opts_list nd_opt_each.list
117
118 #define NDOPT_FLAG_SRCLINKADDR 0x1
119 #define NDOPT_FLAG_TGTLINKADDR 0x2
120 #define NDOPT_FLAG_PREFIXINFO 0x4
121 #define NDOPT_FLAG_RDHDR 0x8
122 #define NDOPT_FLAG_MTU 0x10
123
124 u_int32_t ndopt_flags[] = {
125 0, NDOPT_FLAG_SRCLINKADDR, NDOPT_FLAG_TGTLINKADDR,
126 NDOPT_FLAG_PREFIXINFO, NDOPT_FLAG_RDHDR, NDOPT_FLAG_MTU
127 };
128
129 int main(int, char *[]);
130 static void set_die(int);
131 static void die(void);
132 static void sock_open(void);
133 static void rtsock_open(void);
134 static void rtadvd_input(void);
135 static void rs_input(int, struct nd_router_solicit *,
136 struct in6_pktinfo *, struct sockaddr_in6 *);
137 static void ra_input(int, struct nd_router_advert *,
138 struct in6_pktinfo *, struct sockaddr_in6 *);
139 static int prefix_check(struct nd_opt_prefix_info *, struct rainfo *,
140 struct sockaddr_in6 *);
141 static int nd6_options(struct nd_opt_hdr *, int,
142 union nd_opts *, u_int32_t);
143 static void free_ndopts(union nd_opts *);
144 static void ra_output(struct rainfo *);
145 static void rtmsg_input(void);
146 static void rtadvd_set_dump_file(void);
147
148 int
149 main(int argc, char *argv[])
150 {
151 fd_set fdset;
152 int maxfd = 0;
153 struct timeval *timeout;
154 int i, ch;
155 int fflag = 0;
156 FILE *pidfp;
157 pid_t pid;
158
159 openlog("rtadvd", LOG_NDELAY|LOG_PID, LOG_DAEMON);
160
161 /* get command line options and arguments */
162 #ifdef MIP6
163 #define OPTIONS "c:dDfM:mRs"
164 #else
165 #define OPTIONS "c:dDfM:Rs"
166 #endif
167 while ((ch = getopt(argc, argv, OPTIONS)) != -1) {
168 #undef OPTIONS
169 switch (ch) {
170 case 'c':
171 conffile = optarg;
172 break;
173 case 'd':
174 dflag = 1;
175 break;
176 case 'D':
177 dflag = 2;
178 break;
179 case 'f':
180 fflag = 1;
181 break;
182 case 'M':
183 mcastif = optarg;
184 break;
185 #ifdef MIP6
186 case 'm':
187 mobileip6 = 1;
188 break;
189 #endif
190 case 'R':
191 fprintf(stderr, "rtadvd: "
192 "the -R option is currently ignored.\n");
193 /* accept_rr = 1; */
194 /* run anyway... */
195 break;
196 case 's':
197 sflag = 1;
198 break;
199 }
200 }
201 argc -= optind;
202 argv += optind;
203 if (argc == 0) {
204 fprintf(stderr,
205 #ifdef MIP6
206 "usage: rtadvd [-dDfMmRs] [-c conffile] "
207 #else
208 "usage: rtadvd [-dDfMRs] [-c conffile] "
209 #endif
210 "interfaces...\n");
211 exit(1);
212 }
213
214 /* set log level */
215 if (dflag == 0)
216 setlogmask(LOG_UPTO(LOG_ERR));
217 if (dflag == 1)
218 setlogmask(LOG_UPTO(LOG_INFO));
219
220 /* timer initialization */
221 rtadvd_timer_init();
222
223 /* random value initialization */
224 srandom((u_long)time(NULL));
225
226 /* get iflist block from kernel */
227 init_iflist();
228
229 while (argc--)
230 getconfig(*argv++);
231
232 if (inet_pton(AF_INET6, ALLNODES, &sin6_allnodes.sin6_addr) != 1) {
233 fprintf(stderr, "fatal: inet_pton failed\n");
234 exit(1);
235 }
236 sock_open();
237
238 if (!fflag)
239 daemon(1, 0);
240
241 /* record the current PID */
242 pid = getpid();
243 if ((pidfp = fopen(pidfilename, "w")) == NULL) {
244 syslog(LOG_ERR,
245 "<%s> failed to open a log file(%s), run anyway.",
246 __func__, pidfilename);
247 } else {
248 fprintf(pidfp, "%d\n", pid);
249 fclose(pidfp);
250 }
251
252 FD_ZERO(&fdset);
253 FD_SET(sock, &fdset);
254 maxfd = sock;
255 if (sflag == 0) {
256 rtsock_open();
257 FD_SET(rtsock, &fdset);
258 if (rtsock > sock)
259 maxfd = rtsock;
260 } else
261 rtsock = -1;
262
263 signal(SIGTERM, (void *)set_die);
264 signal(SIGUSR1, (void *)rtadvd_set_dump_file);
265
266 while (1) {
267 struct fd_set select_fd = fdset; /* reinitialize */
268
269 if (do_dump) { /* SIGUSR1 */
270 do_dump = 0;
271 rtadvd_dump_file(dumpfilename);
272 }
273
274 if (do_die) {
275 die();
276 /*NOTREACHED*/
277 }
278
279 /* timer expiration check and reset the timer */
280 timeout = rtadvd_check_timer();
281
282 if (timeout != NULL) {
283 syslog(LOG_DEBUG,
284 "<%s> set timer to %ld:%ld. waiting for "
285 "inputs or timeout", __func__,
286 (long int)timeout->tv_sec,
287 (long int)timeout->tv_usec);
288 } else {
289 syslog(LOG_DEBUG,
290 "<%s> there's no timer. waiting for inputs",
291 __func__);
292 }
293
294 if ((i = select(maxfd + 1, &select_fd,
295 NULL, NULL, timeout)) < 0) {
296 /* EINTR would occur upon SIGUSR1 for status dump */
297 if (errno != EINTR)
298 syslog(LOG_ERR, "<%s> select: %s",
299 __func__, strerror(errno));
300 continue;
301 }
302 if (i == 0) /* timeout */
303 continue;
304 if (rtsock != -1 && FD_ISSET(rtsock, &select_fd))
305 rtmsg_input();
306 if (FD_ISSET(sock, &select_fd))
307 rtadvd_input();
308 }
309 exit(0); /* NOTREACHED */
310 }
311
312 static void
313 rtadvd_set_dump_file(void)
314 {
315 do_dump = 1;
316 }
317
318 static void
319 set_die(int sig)
320 {
321 do_die = 1;
322 }
323
324 static void
325 die(void)
326 {
327 struct rainfo *ra;
328 int i;
329 const int retrans = MAX_FINAL_RTR_ADVERTISEMENTS;
330
331 if (dflag > 1) {
332 syslog(LOG_DEBUG, "<%s> cease to be an advertising router\n",
333 __func__);
334 }
335
336 for (ra = ralist; ra; ra = ra->next) {
337 ra->lifetime = 0;
338 make_packet(ra);
339 }
340 for (i = 0; i < retrans; i++) {
341 for (ra = ralist; ra; ra = ra->next)
342 ra_output(ra);
343 sleep(MIN_DELAY_BETWEEN_RAS);
344 }
345 exit(0);
346 /*NOTREACHED*/
347 }
348
349 static void
350 rtmsg_input(void)
351 {
352 int n, type, ifindex = 0, plen;
353 size_t len;
354 char msg[2048], *next, *lim;
355 u_char ifname[IF_NAMESIZE];
356 struct prefix *prefix;
357 struct rainfo *rai;
358 struct in6_addr *addr;
359 char addrbuf[INET6_ADDRSTRLEN];
360
361 n = read(rtsock, msg, sizeof(msg));
362 if (dflag > 1) {
363 syslog(LOG_DEBUG, "<%s> received a routing message "
364 "(type = %d, len = %d)", __func__, rtmsg_type(msg), n);
365 }
366 if (n > rtmsg_len(msg)) {
367 /*
368 * This usually won't happen for messages received on
369 * a routing socket.
370 */
371 if (dflag > 1)
372 syslog(LOG_DEBUG,
373 "<%s> received data length is larger than "
374 "1st routing message len. multiple messages? "
375 "read %d bytes, but 1st msg len = %d",
376 __func__, n, rtmsg_len(msg));
377 #if 0
378 /* adjust length */
379 n = rtmsg_len(msg);
380 #endif
381 }
382
383 lim = msg + n;
384 for (next = msg; next < lim; next += len) {
385 int oldifflags;
386
387 next = get_next_msg(next, lim, 0, &len,
388 RTADV_TYPE2BITMASK(RTM_ADD) |
389 RTADV_TYPE2BITMASK(RTM_DELETE) |
390 RTADV_TYPE2BITMASK(RTM_NEWADDR) |
391 RTADV_TYPE2BITMASK(RTM_DELADDR) |
392 RTADV_TYPE2BITMASK(RTM_IFINFO));
393 if (len == 0)
394 break;
395 type = rtmsg_type(next);
396 switch (type) {
397 case RTM_ADD:
398 case RTM_DELETE:
399 ifindex = get_rtm_ifindex(next);
400 break;
401 case RTM_NEWADDR:
402 case RTM_DELADDR:
403 ifindex = get_ifam_ifindex(next);
404 break;
405 case RTM_IFINFO:
406 ifindex = get_ifm_ifindex(next);
407 break;
408 default:
409 /* should not reach here */
410 if (dflag > 1) {
411 syslog(LOG_DEBUG,
412 "<%s:%d> unknown rtmsg %d on %s",
413 __func__, __LINE__, type,
414 if_indextoname(ifindex, ifname));
415 }
416 continue;
417 }
418
419 if ((rai = if_indextorainfo(ifindex)) == NULL) {
420 if (dflag > 1) {
421 syslog(LOG_DEBUG,
422 "<%s> route changed on "
423 "non advertising interface(%s)",
424 __func__,
425 if_indextoname(ifindex, ifname));
426 }
427 continue;
428 }
429 oldifflags = iflist[ifindex]->ifm_flags;
430
431 switch (type) {
432 case RTM_ADD:
433 /* init ifflags because it may have changed */
434 iflist[ifindex]->ifm_flags =
435 if_getflags(ifindex, iflist[ifindex]->ifm_flags);
436
437 if (sflag)
438 break; /* we aren't interested in prefixes */
439
440 addr = get_addr(msg);
441 plen = get_prefixlen(msg);
442 /* sanity check for plen */
443 /* as RFC2373, prefixlen is at least 4 */
444 if (plen < 4 || plen > 127) {
445 syslog(LOG_INFO, "<%s> new interface route's"
446 "plen %d is invalid for a prefix",
447 __func__, plen);
448 break;
449 }
450 prefix = find_prefix(rai, addr, plen);
451 if (prefix) {
452 if (prefix->timer) {
453 /*
454 * If the prefix has been invalidated,
455 * make it available again.
456 */
457 update_prefix(prefix);
458 } else if (dflag > 1) {
459 syslog(LOG_DEBUG,
460 "<%s> new prefix(%s/%d) "
461 "added on %s, "
462 "but it was already in list",
463 __func__,
464 inet_ntop(AF_INET6, addr,
465 (char *)addrbuf, INET6_ADDRSTRLEN),
466 plen, rai->ifname);
467 }
468 break;
469 }
470 make_prefix(rai, ifindex, addr, plen);
471 break;
472 case RTM_DELETE:
473 /* init ifflags because it may have changed */
474 iflist[ifindex]->ifm_flags =
475 if_getflags(ifindex, iflist[ifindex]->ifm_flags);
476
477 if (sflag)
478 break;
479
480 addr = get_addr(msg);
481 plen = get_prefixlen(msg);
482 /* sanity check for plen */
483 /* as RFC2373, prefixlen is at least 4 */
484 if (plen < 4 || plen > 127) {
485 syslog(LOG_INFO,
486 "<%s> deleted interface route's "
487 "plen %d is invalid for a prefix",
488 __func__, plen);
489 break;
490 }
491 prefix = find_prefix(rai, addr, plen);
492 if (prefix == NULL) {
493 if (dflag > 1) {
494 syslog(LOG_DEBUG,
495 "<%s> prefix(%s/%d) was "
496 "deleted on %s, "
497 "but it was not in list",
498 __func__,
499 inet_ntop(AF_INET6, addr,
500 (char *)addrbuf, INET6_ADDRSTRLEN),
501 plen, rai->ifname);
502 }
503 break;
504 }
505 invalidate_prefix(prefix);
506 break;
507 case RTM_NEWADDR:
508 case RTM_DELADDR:
509 /* init ifflags because it may have changed */
510 iflist[ifindex]->ifm_flags =
511 if_getflags(ifindex, iflist[ifindex]->ifm_flags);
512 break;
513 case RTM_IFINFO:
514 iflist[ifindex]->ifm_flags = get_ifm_flags(next);
515 break;
516 default:
517 /* should not reach here */
518 if (dflag > 1) {
519 syslog(LOG_DEBUG,
520 "<%s:%d> unknown rtmsg %d on %s",
521 __func__, __LINE__, type,
522 if_indextoname(ifindex, ifname));
523 }
524 return;
525 }
526
527 /* check if an interface flag is changed */
528 if ((oldifflags & IFF_UP) != 0 && /* UP to DOWN */
529 (iflist[ifindex]->ifm_flags & IFF_UP) == 0) {
530 syslog(LOG_INFO,
531 "<%s> interface %s becomes down. stop timer.",
532 __func__, rai->ifname);
533 rtadvd_remove_timer(&rai->timer);
534 } else if ((oldifflags & IFF_UP) == 0 && /* DOWN to UP */
535 (iflist[ifindex]->ifm_flags & IFF_UP) != 0) {
536 syslog(LOG_INFO,
537 "<%s> interface %s becomes up. restart timer.",
538 __func__, rai->ifname);
539
540 rai->initcounter = 0; /* reset the counter */
541 rai->waiting = 0; /* XXX */
542 rai->timer = rtadvd_add_timer(ra_timeout,
543 ra_timer_update, rai, rai);
544 ra_timer_update((void *)rai, &rai->timer->tm);
545 rtadvd_set_timer(&rai->timer->tm, rai->timer);
546 }
547 }
548
549 return;
550 }
551
552 void
553 rtadvd_input(void)
554 {
555 int i;
556 int *hlimp = NULL;
557 #ifdef OLDRAWSOCKET
558 struct ip6_hdr *ip;
559 #endif
560 struct icmp6_hdr *icp;
561 int ifindex = 0;
562 struct cmsghdr *cm;
563 struct in6_pktinfo *pi = NULL;
564 u_char ntopbuf[INET6_ADDRSTRLEN], ifnamebuf[IFNAMSIZ];
565 struct in6_addr dst = in6addr_any;
566
567 /*
568 * Get message. We reset msg_controllen since the field could
569 * be modified if we had received a message before setting
570 * receive options.
571 */
572 rcvmhdr.msg_controllen = rcvcmsgbuflen;
573 if ((i = recvmsg(sock, &rcvmhdr, 0)) < 0)
574 return;
575
576 /* extract optional information via Advanced API */
577 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(&rcvmhdr);
578 cm;
579 cm = (struct cmsghdr *)CMSG_NXTHDR(&rcvmhdr, cm)) {
580 if (cm->cmsg_level == IPPROTO_IPV6 &&
581 cm->cmsg_type == IPV6_PKTINFO &&
582 cm->cmsg_len == CMSG_LEN(sizeof(struct in6_pktinfo))) {
583 pi = (struct in6_pktinfo *)(CMSG_DATA(cm));
584 ifindex = pi->ipi6_ifindex;
585 dst = pi->ipi6_addr;
586 }
587 if (cm->cmsg_level == IPPROTO_IPV6 &&
588 cm->cmsg_type == IPV6_HOPLIMIT &&
589 cm->cmsg_len == CMSG_LEN(sizeof(int)))
590 hlimp = (int *)CMSG_DATA(cm);
591 }
592 if (ifindex == 0) {
593 syslog(LOG_ERR,
594 "<%s> failed to get receiving interface",
595 __func__);
596 return;
597 }
598 if (hlimp == NULL) {
599 syslog(LOG_ERR,
600 "<%s> failed to get receiving hop limit",
601 __func__);
602 return;
603 }
604
605 /*
606 * If we happen to receive data on an interface which is now down,
607 * just discard the data.
608 */
609 if ((iflist[pi->ipi6_ifindex]->ifm_flags & IFF_UP) == 0) {
610 syslog(LOG_INFO,
611 "<%s> received data on a disabled interface (%s)",
612 __func__,
613 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
614 return;
615 }
616
617 #ifdef OLDRAWSOCKET
618 if (i < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr)) {
619 syslog(LOG_ERR,
620 "<%s> packet size(%d) is too short",
621 __func__, i);
622 return;
623 }
624
625 ip = (struct ip6_hdr *)rcvmhdr.msg_iov[0].iov_base;
626 icp = (struct icmp6_hdr *)(ip + 1); /* XXX: ext. hdr? */
627 #else
628 if (i < sizeof(struct icmp6_hdr)) {
629 syslog(LOG_ERR,
630 "<%s> packet size(%d) is too short",
631 __func__, i);
632 return;
633 }
634
635 icp = (struct icmp6_hdr *)rcvmhdr.msg_iov[0].iov_base;
636 #endif
637
638 switch (icp->icmp6_type) {
639 case ND_ROUTER_SOLICIT:
640 /*
641 * Message verification - RFC-2461 6.1.1
642 * XXX: these checks must be done in the kernel as well,
643 * but we can't completely rely on them.
644 */
645 if (*hlimp != 255) {
646 syslog(LOG_NOTICE,
647 "<%s> RS with invalid hop limit(%d) "
648 "received from %s on %s",
649 __func__, *hlimp,
650 inet_ntop(AF_INET6, &from.sin6_addr, ntopbuf,
651 INET6_ADDRSTRLEN),
652 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
653 return;
654 }
655 if (icp->icmp6_code) {
656 syslog(LOG_NOTICE,
657 "<%s> RS with invalid ICMP6 code(%d) "
658 "received from %s on %s",
659 __func__, icp->icmp6_code,
660 inet_ntop(AF_INET6, &from.sin6_addr, ntopbuf,
661 INET6_ADDRSTRLEN),
662 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
663 return;
664 }
665 if (i < sizeof(struct nd_router_solicit)) {
666 syslog(LOG_NOTICE,
667 "<%s> RS from %s on %s does not have enough "
668 "length (len = %d)",
669 __func__,
670 inet_ntop(AF_INET6, &from.sin6_addr, ntopbuf,
671 INET6_ADDRSTRLEN),
672 if_indextoname(pi->ipi6_ifindex, ifnamebuf), i);
673 return;
674 }
675 rs_input(i, (struct nd_router_solicit *)icp, pi, &from);
676 break;
677 case ND_ROUTER_ADVERT:
678 /*
679 * Message verification - RFC-2461 6.1.2
680 * XXX: there's a same dilemma as above...
681 */
682 if (*hlimp != 255) {
683 syslog(LOG_NOTICE,
684 "<%s> RA with invalid hop limit(%d) "
685 "received from %s on %s",
686 __func__, *hlimp,
687 inet_ntop(AF_INET6, &from.sin6_addr, ntopbuf,
688 INET6_ADDRSTRLEN),
689 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
690 return;
691 }
692 if (icp->icmp6_code) {
693 syslog(LOG_NOTICE,
694 "<%s> RA with invalid ICMP6 code(%d) "
695 "received from %s on %s",
696 __func__, icp->icmp6_code,
697 inet_ntop(AF_INET6, &from.sin6_addr, ntopbuf,
698 INET6_ADDRSTRLEN),
699 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
700 return;
701 }
702 if (i < sizeof(struct nd_router_advert)) {
703 syslog(LOG_NOTICE,
704 "<%s> RA from %s on %s does not have enough "
705 "length (len = %d)",
706 __func__,
707 inet_ntop(AF_INET6, &from.sin6_addr, ntopbuf,
708 INET6_ADDRSTRLEN),
709 if_indextoname(pi->ipi6_ifindex, ifnamebuf), i);
710 return;
711 }
712 ra_input(i, (struct nd_router_advert *)icp, pi, &from);
713 break;
714 case ICMP6_ROUTER_RENUMBERING:
715 if (accept_rr == 0) {
716 syslog(LOG_ERR, "<%s> received a router renumbering "
717 "message, but not allowed to be accepted",
718 __func__);
719 break;
720 }
721 rr_input(i, (struct icmp6_router_renum *)icp, pi, &from,
722 &dst);
723 break;
724 default:
725 /*
726 * Note that this case is POSSIBLE, especially just
727 * after invocation of the daemon. This is because we
728 * could receive message after opening the socket and
729 * before setting ICMP6 type filter(see sock_open()).
730 */
731 syslog(LOG_ERR, "<%s> invalid icmp type(%d)",
732 __func__, icp->icmp6_type);
733 return;
734 }
735
736 return;
737 }
738
739 static void
740 rs_input(int len, struct nd_router_solicit *rs,
741 struct in6_pktinfo *pi, struct sockaddr_in6 *from)
742 {
743 u_char ntopbuf[INET6_ADDRSTRLEN], ifnamebuf[IFNAMSIZ];
744 union nd_opts ndopts;
745 struct rainfo *ra;
746
747 syslog(LOG_DEBUG,
748 "<%s> RS received from %s on %s",
749 __func__,
750 inet_ntop(AF_INET6, &from->sin6_addr,
751 ntopbuf, INET6_ADDRSTRLEN),
752 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
753
754 /* ND option check */
755 memset(&ndopts, 0, sizeof(ndopts));
756 if (nd6_options((struct nd_opt_hdr *)(rs + 1),
757 len - sizeof(struct nd_router_solicit),
758 &ndopts, NDOPT_FLAG_SRCLINKADDR)) {
759 syslog(LOG_DEBUG,
760 "<%s> ND option check failed for an RS from %s on %s",
761 __func__,
762 inet_ntop(AF_INET6, &from->sin6_addr,
763 ntopbuf, INET6_ADDRSTRLEN),
764 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
765 return;
766 }
767
768 /*
769 * If the IP source address is the unspecified address, there
770 * must be no source link-layer address option in the message.
771 * (RFC-2461 6.1.1)
772 */
773 if (IN6_IS_ADDR_UNSPECIFIED(&from->sin6_addr) &&
774 ndopts.nd_opts_src_lladdr) {
775 syslog(LOG_ERR,
776 "<%s> RS from unspecified src on %s has a link-layer"
777 " address option",
778 __func__,
779 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
780 goto done;
781 }
782
783 ra = ralist;
784 while (ra != NULL) {
785 if (pi->ipi6_ifindex == ra->ifindex)
786 break;
787 ra = ra->next;
788 }
789 if (ra == NULL) {
790 syslog(LOG_INFO,
791 "<%s> RS received on non advertising interface(%s)",
792 __func__,
793 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
794 goto done;
795 }
796
797 ra->rsinput++; /* increment statistics */
798
799 /*
800 * Decide whether to send RA according to the rate-limit
801 * consideration.
802 */
803 {
804 long delay; /* must not be greater than 1000000 */
805 struct timeval interval, now, min_delay, tm_tmp, *rest;
806 struct soliciter *sol;
807
808 /*
809 * record sockaddr waiting for RA, if possible
810 */
811 sol = (struct soliciter *)malloc(sizeof(*sol));
812 if (sol) {
813 sol->addr = *from;
814 /*XXX RFC2553 need clarification on flowinfo */
815 sol->addr.sin6_flowinfo = 0;
816 sol->next = ra->soliciter;
817 ra->soliciter = sol->next;
818 }
819
820 /*
821 * If there is already a waiting RS packet, don't
822 * update the timer.
823 */
824 if (ra->waiting++)
825 goto done;
826
827 /*
828 * Compute a random delay. If the computed value
829 * corresponds to a time later than the time the next
830 * multicast RA is scheduled to be sent, ignore the random
831 * delay and send the advertisement at the
832 * already-scheduled time. RFC-2461 6.2.6
833 */
834 delay = random() % MAX_RA_DELAY_TIME;
835 interval.tv_sec = 0;
836 interval.tv_usec = delay;
837 rest = rtadvd_timer_rest(ra->timer);
838 if (TIMEVAL_LT(*rest, interval)) {
839 syslog(LOG_DEBUG,
840 "<%s> random delay is larger than "
841 "the rest of normal timer",
842 __func__);
843 interval = *rest;
844 }
845
846 /*
847 * If we sent a multicast Router Advertisement within
848 * the last MIN_DELAY_BETWEEN_RAS seconds, schedule
849 * the advertisement to be sent at a time corresponding to
850 * MIN_DELAY_BETWEEN_RAS plus the random value after the
851 * previous advertisement was sent.
852 */
853 gettimeofday(&now, NULL);
854 TIMEVAL_SUB(&now, &ra->lastsent, &tm_tmp);
855 min_delay.tv_sec = MIN_DELAY_BETWEEN_RAS;
856 min_delay.tv_usec = 0;
857 if (TIMEVAL_LT(tm_tmp, min_delay)) {
858 TIMEVAL_SUB(&min_delay, &tm_tmp, &min_delay);
859 TIMEVAL_ADD(&min_delay, &interval, &interval);
860 }
861 rtadvd_set_timer(&interval, ra->timer);
862 goto done;
863 }
864
865 done:
866 free_ndopts(&ndopts);
867 return;
868 }
869
870 static void
871 ra_input(int len, struct nd_router_advert *ra,
872 struct in6_pktinfo *pi, struct sockaddr_in6 *from)
873 {
874 struct rainfo *rai;
875 u_char ntopbuf[INET6_ADDRSTRLEN], ifnamebuf[IFNAMSIZ];
876 union nd_opts ndopts;
877 char *on_off[] = {"OFF", "ON"};
878 u_int32_t reachabletime, retranstimer, mtu;
879 int inconsistent = 0;
880
881 syslog(LOG_DEBUG,
882 "<%s> RA received from %s on %s",
883 __func__,
884 inet_ntop(AF_INET6, &from->sin6_addr,
885 ntopbuf, INET6_ADDRSTRLEN),
886 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
887
888 /* ND option check */
889 memset(&ndopts, 0, sizeof(ndopts));
890 if (nd6_options((struct nd_opt_hdr *)(ra + 1),
891 len - sizeof(struct nd_router_advert),
892 &ndopts, NDOPT_FLAG_SRCLINKADDR |
893 NDOPT_FLAG_PREFIXINFO | NDOPT_FLAG_MTU)) {
894 syslog(LOG_ERR,
895 "<%s> ND option check failed for an RA from %s on %s",
896 __func__,
897 inet_ntop(AF_INET6, &from->sin6_addr,
898 ntopbuf, INET6_ADDRSTRLEN),
899 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
900 return;
901 }
902
903 /*
904 * RA consistency check according to RFC-2461 6.2.7
905 */
906 if ((rai = if_indextorainfo(pi->ipi6_ifindex)) == 0) {
907 syslog(LOG_INFO,
908 "<%s> received RA from %s on non-advertising"
909 " interface(%s)",
910 __func__,
911 inet_ntop(AF_INET6, &from->sin6_addr,
912 ntopbuf, INET6_ADDRSTRLEN),
913 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
914 goto done;
915 }
916 rai->rainput++; /* increment statistics */
917
918 /* Cur Hop Limit value */
919 if (ra->nd_ra_curhoplimit && rai->hoplimit &&
920 ra->nd_ra_curhoplimit != rai->hoplimit) {
921 syslog(LOG_INFO,
922 "<%s> CurHopLimit inconsistent on %s:"
923 " %d from %s, %d from us",
924 __func__,
925 rai->ifname,
926 ra->nd_ra_curhoplimit,
927 inet_ntop(AF_INET6, &from->sin6_addr,
928 ntopbuf, INET6_ADDRSTRLEN),
929 rai->hoplimit);
930 inconsistent++;
931 }
932 /* M flag */
933 if ((ra->nd_ra_flags_reserved & ND_RA_FLAG_MANAGED) !=
934 rai->managedflg) {
935 syslog(LOG_INFO,
936 "<%s> M flag inconsistent on %s:"
937 " %s from %s, %s from us",
938 __func__,
939 rai->ifname,
940 on_off[!rai->managedflg],
941 inet_ntop(AF_INET6, &from->sin6_addr,
942 ntopbuf, INET6_ADDRSTRLEN),
943 on_off[rai->managedflg]);
944 inconsistent++;
945 }
946 /* O flag */
947 if ((ra->nd_ra_flags_reserved & ND_RA_FLAG_OTHER) !=
948 rai->otherflg) {
949 syslog(LOG_INFO,
950 "<%s> O flag inconsistent on %s:"
951 " %s from %s, %s from us",
952 __func__,
953 rai->ifname,
954 on_off[!rai->otherflg],
955 inet_ntop(AF_INET6, &from->sin6_addr,
956 ntopbuf, INET6_ADDRSTRLEN),
957 on_off[rai->otherflg]);
958 inconsistent++;
959 }
960 /* Reachable Time */
961 reachabletime = ntohl(ra->nd_ra_reachable);
962 if (reachabletime && rai->reachabletime &&
963 reachabletime != rai->reachabletime) {
964 syslog(LOG_INFO,
965 "<%s> ReachableTime inconsistent on %s:"
966 " %d from %s, %d from us",
967 __func__,
968 rai->ifname,
969 reachabletime,
970 inet_ntop(AF_INET6, &from->sin6_addr,
971 ntopbuf, INET6_ADDRSTRLEN),
972 rai->reachabletime);
973 inconsistent++;
974 }
975 /* Retrans Timer */
976 retranstimer = ntohl(ra->nd_ra_retransmit);
977 if (retranstimer && rai->retranstimer &&
978 retranstimer != rai->retranstimer) {
979 syslog(LOG_INFO,
980 "<%s> RetranceTimer inconsistent on %s:"
981 " %d from %s, %d from us",
982 __func__,
983 rai->ifname,
984 retranstimer,
985 inet_ntop(AF_INET6, &from->sin6_addr,
986 ntopbuf, INET6_ADDRSTRLEN),
987 rai->retranstimer);
988 inconsistent++;
989 }
990 /* Values in the MTU options */
991 if (ndopts.nd_opts_mtu) {
992 mtu = ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu);
993 if (mtu && rai->linkmtu && mtu != rai->linkmtu) {
994 syslog(LOG_INFO,
995 "<%s> MTU option value inconsistent on %s:"
996 " %d from %s, %d from us",
997 __func__,
998 rai->ifname, mtu,
999 inet_ntop(AF_INET6, &from->sin6_addr,
1000 ntopbuf, INET6_ADDRSTRLEN),
1001 rai->linkmtu);
1002 inconsistent++;
1003 }
1004 }
1005 /* Preferred and Valid Lifetimes for prefixes */
1006 {
1007 struct nd_optlist *optp = ndopts.nd_opts_list;
1008
1009 if (ndopts.nd_opts_pi) {
1010 if (prefix_check(ndopts.nd_opts_pi, rai, from))
1011 inconsistent++;
1012 }
1013 while (optp) {
1014 if (prefix_check((struct nd_opt_prefix_info *)optp->opt,
1015 rai, from))
1016 inconsistent++;
1017 optp = optp->next;
1018 }
1019 }
1020
1021 if (inconsistent)
1022 rai->rainconsistent++;
1023
1024 done:
1025 free_ndopts(&ndopts);
1026 return;
1027 }
1028
1029 /* return a non-zero value if the received prefix is inconsitent with ours */
1030 static int
1031 prefix_check(struct nd_opt_prefix_info *pinfo,
1032 struct rainfo *rai, struct sockaddr_in6 *from)
1033 {
1034 u_int32_t preferred_time, valid_time;
1035 struct prefix *pp;
1036 int inconsistent = 0;
1037 u_char ntopbuf[INET6_ADDRSTRLEN], prefixbuf[INET6_ADDRSTRLEN];
1038 struct timeval now;
1039
1040 #if 0 /* impossible */
1041 if (pinfo->nd_opt_pi_type != ND_OPT_PREFIX_INFORMATION)
1042 return(0);
1043 #endif
1044
1045 /*
1046 * log if the adveritsed prefix has link-local scope(sanity check?)
1047 */
1048 if (IN6_IS_ADDR_LINKLOCAL(&pinfo->nd_opt_pi_prefix)) {
1049 syslog(LOG_INFO,
1050 "<%s> link-local prefix %s/%d is advertised "
1051 "from %s on %s",
1052 __func__,
1053 inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix,
1054 prefixbuf, INET6_ADDRSTRLEN),
1055 pinfo->nd_opt_pi_prefix_len,
1056 inet_ntop(AF_INET6, &from->sin6_addr,
1057 ntopbuf, INET6_ADDRSTRLEN),
1058 rai->ifname);
1059 }
1060
1061 if ((pp = find_prefix(rai, &pinfo->nd_opt_pi_prefix,
1062 pinfo->nd_opt_pi_prefix_len)) == NULL) {
1063 syslog(LOG_INFO,
1064 "<%s> prefix %s/%d from %s on %s is not in our list",
1065 __func__,
1066 inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix,
1067 prefixbuf, INET6_ADDRSTRLEN),
1068 pinfo->nd_opt_pi_prefix_len,
1069 inet_ntop(AF_INET6, &from->sin6_addr,
1070 ntopbuf, INET6_ADDRSTRLEN),
1071 rai->ifname);
1072 return(0);
1073 }
1074
1075 preferred_time = ntohl(pinfo->nd_opt_pi_preferred_time);
1076 if (pp->pltimeexpire) {
1077 /*
1078 * The lifetime is decremented in real time, so we should
1079 * compare the expiration time.
1080 * (RFC 2461 Section 6.2.7.)
1081 * XXX: can we really expect that all routers on the link
1082 * have synchronized clocks?
1083 */
1084 gettimeofday(&now, NULL);
1085 preferred_time += now.tv_sec;
1086
1087 if (rai->clockskew &&
1088 abs(preferred_time - pp->pltimeexpire) > rai->clockskew) {
1089 syslog(LOG_INFO,
1090 "<%s> prefeerred lifetime for %s/%d"
1091 " (decr. in real time) inconsistent on %s:"
1092 " %d from %s, %ld from us",
1093 __func__,
1094 inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix,
1095 prefixbuf, INET6_ADDRSTRLEN),
1096 pinfo->nd_opt_pi_prefix_len,
1097 rai->ifname, preferred_time,
1098 inet_ntop(AF_INET6, &from->sin6_addr,
1099 ntopbuf, INET6_ADDRSTRLEN),
1100 pp->pltimeexpire);
1101 inconsistent++;
1102 }
1103 } else if (preferred_time != pp->preflifetime) {
1104 syslog(LOG_INFO,
1105 "<%s> prefeerred lifetime for %s/%d"
1106 " inconsistent on %s:"
1107 " %d from %s, %d from us",
1108 __func__,
1109 inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix,
1110 prefixbuf, INET6_ADDRSTRLEN),
1111 pinfo->nd_opt_pi_prefix_len,
1112 rai->ifname, preferred_time,
1113 inet_ntop(AF_INET6, &from->sin6_addr,
1114 ntopbuf, INET6_ADDRSTRLEN),
1115 pp->preflifetime);
1116 }
1117
1118 valid_time = ntohl(pinfo->nd_opt_pi_valid_time);
1119 if (pp->vltimeexpire) {
1120 gettimeofday(&now, NULL);
1121 valid_time += now.tv_sec;
1122
1123 if (rai->clockskew &&
1124 abs(valid_time - pp->vltimeexpire) > rai->clockskew) {
1125 syslog(LOG_INFO,
1126 "<%s> valid lifetime for %s/%d"
1127 " (decr. in real time) inconsistent on %s:"
1128 " %d from %s, %ld from us",
1129 __func__,
1130 inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix,
1131 prefixbuf, INET6_ADDRSTRLEN),
1132 pinfo->nd_opt_pi_prefix_len,
1133 rai->ifname, preferred_time,
1134 inet_ntop(AF_INET6, &from->sin6_addr,
1135 ntopbuf, INET6_ADDRSTRLEN),
1136 pp->vltimeexpire);
1137 inconsistent++;
1138 }
1139 } else if (valid_time != pp->validlifetime) {
1140 syslog(LOG_INFO,
1141 "<%s> valid lifetime for %s/%d"
1142 " inconsistent on %s:"
1143 " %d from %s, %d from us",
1144 __func__,
1145 inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix,
1146 prefixbuf, INET6_ADDRSTRLEN),
1147 pinfo->nd_opt_pi_prefix_len,
1148 rai->ifname, valid_time,
1149 inet_ntop(AF_INET6, &from->sin6_addr,
1150 ntopbuf, INET6_ADDRSTRLEN),
1151 pp->validlifetime);
1152 inconsistent++;
1153 }
1154
1155 return(inconsistent);
1156 }
1157
1158 struct prefix *
1159 find_prefix(struct rainfo *rai, struct in6_addr *prefix, int plen)
1160 {
1161 struct prefix *pp;
1162 int bytelen, bitlen;
1163
1164 for (pp = rai->prefix.next; pp != &rai->prefix; pp = pp->next) {
1165 if (plen != pp->prefixlen)
1166 continue;
1167 bytelen = plen / 8;
1168 bitlen = plen % 8;
1169 if (memcmp((void *)prefix, (void *)&pp->prefix, bytelen))
1170 continue;
1171 if (prefix->s6_addr[bytelen] >> (8 - bitlen) ==
1172 pp->prefix.s6_addr[bytelen] >> (8 - bitlen))
1173 return(pp);
1174 }
1175
1176 return(NULL);
1177 }
1178
1179 /* check if p0/plen0 matches p1/plen1; return 1 if matches, otherwise 0. */
1180 int
1181 prefix_match(struct in6_addr *p0, int plen0,
1182 struct in6_addr *p1, int plen1)
1183 {
1184 int bytelen, bitlen;
1185
1186 if (plen0 < plen1)
1187 return(0);
1188 bytelen = plen1 / 8;
1189 bitlen = plen1 % 8;
1190 if (memcmp((void *)p0, (void *)p1, bytelen))
1191 return(0);
1192 if (p0->s6_addr[bytelen] >> (8 - bitlen) ==
1193 p1->s6_addr[bytelen] >> (8 - bitlen))
1194 return(1);
1195
1196 return(0);
1197 }
1198
1199 static int
1200 nd6_options(struct nd_opt_hdr *hdr, int limit,
1201 union nd_opts *ndopts, u_int32_t optflags)
1202 {
1203 int optlen = 0;
1204
1205 for (; limit > 0; limit -= optlen) {
1206 if (limit < sizeof(struct nd_opt_hdr)) {
1207 syslog(LOG_INFO, "<%s> short option header", __func__);
1208 goto bad;
1209 }
1210
1211 hdr = (struct nd_opt_hdr *)((caddr_t)hdr + optlen);
1212 if (hdr->nd_opt_len == 0) {
1213 syslog(LOG_INFO,
1214 "<%s> bad ND option length(0) (type = %d)",
1215 __func__, hdr->nd_opt_type);
1216 goto bad;
1217 }
1218 optlen = hdr->nd_opt_len << 3;
1219 if (optlen > limit) {
1220 syslog(LOG_INFO, "<%s> short option", __func__);
1221 goto bad;
1222 }
1223
1224 if (hdr->nd_opt_type > ND_OPT_MTU) {
1225 syslog(LOG_INFO,
1226 "<%s> unknown ND option(type %d)",
1227 __func__, hdr->nd_opt_type);
1228 continue;
1229 }
1230
1231 if ((ndopt_flags[hdr->nd_opt_type] & optflags) == 0) {
1232 syslog(LOG_INFO,
1233 "<%s> unexpected ND option(type %d)",
1234 __func__, hdr->nd_opt_type);
1235 continue;
1236 }
1237
1238 /*
1239 * Option length check. Do it here for all fixed-length
1240 * options.
1241 */
1242 if ((hdr->nd_opt_type == ND_OPT_MTU &&
1243 (optlen != sizeof(struct nd_opt_mtu))) ||
1244 ((hdr->nd_opt_type == ND_OPT_PREFIX_INFORMATION &&
1245 optlen != sizeof(struct nd_opt_prefix_info)))) {
1246 syslog(LOG_INFO, "<%s> invalid option length",
1247 __func__);
1248 continue;
1249 }
1250
1251 switch (hdr->nd_opt_type) {
1252 case ND_OPT_SOURCE_LINKADDR:
1253 case ND_OPT_TARGET_LINKADDR:
1254 case ND_OPT_REDIRECTED_HEADER:
1255 break; /* we don't care about these options */
1256 case ND_OPT_MTU:
1257 if (ndopts->nd_opt_array[hdr->nd_opt_type]) {
1258 syslog(LOG_INFO,
1259 "<%s> duplicated ND option (type = %d)",
1260 __func__, hdr->nd_opt_type);
1261 }
1262 ndopts->nd_opt_array[hdr->nd_opt_type] = hdr;
1263 break;
1264 case ND_OPT_PREFIX_INFORMATION:
1265 {
1266 struct nd_optlist *pfxlist;
1267
1268 if (ndopts->nd_opts_pi == 0) {
1269 ndopts->nd_opts_pi =
1270 (struct nd_opt_prefix_info *)hdr;
1271 continue;
1272 }
1273 if ((pfxlist = malloc(sizeof(*pfxlist))) == NULL) {
1274 syslog(LOG_ERR, "<%s> can't allocate memory",
1275 __func__);
1276 goto bad;
1277 }
1278 pfxlist->next = ndopts->nd_opts_list;
1279 pfxlist->opt = hdr;
1280 ndopts->nd_opts_list = pfxlist;
1281
1282 break;
1283 }
1284 default: /* impossible */
1285 break;
1286 }
1287 }
1288
1289 return(0);
1290
1291 bad:
1292 free_ndopts(ndopts);
1293
1294 return(-1);
1295 }
1296
1297 static void
1298 free_ndopts(union nd_opts *ndopts)
1299 {
1300 struct nd_optlist *opt = ndopts->nd_opts_list, *next;
1301
1302 while (opt) {
1303 next = opt->next;
1304 free(opt);
1305 opt = next;
1306 }
1307 }
1308
1309 void
1310 sock_open(void)
1311 {
1312 struct icmp6_filter filt;
1313 struct ipv6_mreq mreq;
1314 struct rainfo *ra = ralist;
1315 int on;
1316 /* XXX: should be max MTU attached to the node */
1317 static u_char answer[1500];
1318
1319 rcvcmsgbuflen = CMSG_SPACE(sizeof(struct in6_pktinfo)) +
1320 CMSG_SPACE(sizeof(int));
1321 rcvcmsgbuf = (u_char *)malloc(rcvcmsgbuflen);
1322 if (rcvcmsgbuf == NULL) {
1323 syslog(LOG_ERR, "<%s> not enough core", __func__);
1324 exit(1);
1325 }
1326
1327 sndcmsgbuflen = CMSG_SPACE(sizeof(struct in6_pktinfo)) +
1328 CMSG_SPACE(sizeof(int));
1329 sndcmsgbuf = (u_char *)malloc(sndcmsgbuflen);
1330 if (sndcmsgbuf == NULL) {
1331 syslog(LOG_ERR, "<%s> not enough core", __func__);
1332 exit(1);
1333 }
1334
1335 if ((sock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0) {
1336 syslog(LOG_ERR, "<%s> socket: %s", __func__,
1337 strerror(errno));
1338 exit(1);
1339 }
1340
1341 /* specify to tell receiving interface */
1342 on = 1;
1343 #ifdef IPV6_RECVPKTINFO
1344 if (setsockopt(sock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &on,
1345 sizeof(on)) < 0) {
1346 syslog(LOG_ERR, "<%s> IPV6_RECVPKTINFO: %s",
1347 __func__, strerror(errno));
1348 exit(1);
1349 }
1350 #else /* old adv. API */
1351 if (setsockopt(sock, IPPROTO_IPV6, IPV6_PKTINFO, &on,
1352 sizeof(on)) < 0) {
1353 syslog(LOG_ERR, "<%s> IPV6_PKTINFO: %s",
1354 __func__, strerror(errno));
1355 exit(1);
1356 }
1357 #endif
1358
1359 on = 1;
1360 /* specify to tell value of hoplimit field of received IP6 hdr */
1361 #ifdef IPV6_RECVHOPLIMIT
1362 if (setsockopt(sock, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &on,
1363 sizeof(on)) < 0) {
1364 syslog(LOG_ERR, "<%s> IPV6_RECVHOPLIMIT: %s",
1365 __func__, strerror(errno));
1366 exit(1);
1367 }
1368 #else /* old adv. API */
1369 if (setsockopt(sock, IPPROTO_IPV6, IPV6_HOPLIMIT, &on,
1370 sizeof(on)) < 0) {
1371 syslog(LOG_ERR, "<%s> IPV6_HOPLIMIT: %s",
1372 __func__, strerror(errno));
1373 exit(1);
1374 }
1375 #endif
1376
1377 ICMP6_FILTER_SETBLOCKALL(&filt);
1378 ICMP6_FILTER_SETPASS(ND_ROUTER_SOLICIT, &filt);
1379 ICMP6_FILTER_SETPASS(ND_ROUTER_ADVERT, &filt);
1380 if (accept_rr)
1381 ICMP6_FILTER_SETPASS(ICMP6_ROUTER_RENUMBERING, &filt);
1382 if (setsockopt(sock, IPPROTO_ICMPV6, ICMP6_FILTER, &filt,
1383 sizeof(filt)) < 0) {
1384 syslog(LOG_ERR, "<%s> IICMP6_FILTER: %s",
1385 __func__, strerror(errno));
1386 exit(1);
1387 }
1388
1389 /*
1390 * join all routers multicast address on each advertising interface.
1391 */
1392 if (inet_pton(AF_INET6, ALLROUTERS_LINK,
1393 &mreq.ipv6mr_multiaddr.s6_addr)
1394 != 1) {
1395 syslog(LOG_ERR, "<%s> inet_pton failed(library bug?)",
1396 __func__);
1397 exit(1);
1398 }
1399 while (ra) {
1400 mreq.ipv6mr_interface = ra->ifindex;
1401 if (setsockopt(sock, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq,
1402 sizeof(mreq)) < 0) {
1403 syslog(LOG_ERR, "<%s> IPV6_JOIN_GROUP(link) on %s: %s",
1404 __func__, ra->ifname, strerror(errno));
1405 exit(1);
1406 }
1407 ra = ra->next;
1408 }
1409
1410 /*
1411 * When attending router renumbering, join all-routers site-local
1412 * multicast group.
1413 */
1414 if (accept_rr) {
1415 if (inet_pton(AF_INET6, ALLROUTERS_SITE,
1416 &in6a_site_allrouters) != 1) {
1417 syslog(LOG_ERR, "<%s> inet_pton failed(library bug?)",
1418 __func__);
1419 exit(1);
1420 }
1421 mreq.ipv6mr_multiaddr = in6a_site_allrouters;
1422 if (mcastif) {
1423 if ((mreq.ipv6mr_interface = if_nametoindex(mcastif))
1424 == 0) {
1425 syslog(LOG_ERR,
1426 "<%s> invalid interface: %s",
1427 __func__, mcastif);
1428 exit(1);
1429 }
1430 } else
1431 mreq.ipv6mr_interface = ralist->ifindex;
1432 if (setsockopt(sock, IPPROTO_IPV6, IPV6_JOIN_GROUP,
1433 &mreq, sizeof(mreq)) < 0) {
1434 syslog(LOG_ERR,
1435 "<%s> IPV6_JOIN_GROUP(site) on %s: %s",
1436 __func__,
1437 mcastif ? mcastif : ralist->ifname,
1438 strerror(errno));
1439 exit(1);
1440 }
1441 }
1442
1443 /* initialize msghdr for receiving packets */
1444 rcviov[0].iov_base = (caddr_t)answer;
1445 rcviov[0].iov_len = sizeof(answer);
1446 rcvmhdr.msg_name = (caddr_t)&from;
1447 rcvmhdr.msg_namelen = sizeof(from);
1448 rcvmhdr.msg_iov = rcviov;
1449 rcvmhdr.msg_iovlen = 1;
1450 rcvmhdr.msg_control = (caddr_t) rcvcmsgbuf;
1451 rcvmhdr.msg_controllen = rcvcmsgbuflen;
1452
1453 /* initialize msghdr for sending packets */
1454 sndmhdr.msg_namelen = sizeof(struct sockaddr_in6);
1455 sndmhdr.msg_iov = sndiov;
1456 sndmhdr.msg_iovlen = 1;
1457 sndmhdr.msg_control = (caddr_t)sndcmsgbuf;
1458 sndmhdr.msg_controllen = sndcmsgbuflen;
1459
1460 return;
1461 }
1462
1463 /* open a routing socket to watch the routing table */
1464 static void
1465 rtsock_open(void)
1466 {
1467 if ((rtsock = socket(PF_ROUTE, SOCK_RAW, 0)) < 0) {
1468 syslog(LOG_ERR,
1469 "<%s> socket: %s", __func__, strerror(errno));
1470 exit(1);
1471 }
1472 }
1473
1474 struct rainfo *
1475 if_indextorainfo(int index)
1476 {
1477 struct rainfo *rai = ralist;
1478
1479 for (rai = ralist; rai; rai = rai->next) {
1480 if (rai->ifindex == index)
1481 return(rai);
1482 }
1483
1484 return(NULL); /* search failed */
1485 }
1486
1487 static void
1488 ra_output(struct rainfo *rainfo)
1489 {
1490 int i;
1491 struct cmsghdr *cm;
1492 struct in6_pktinfo *pi;
1493 struct soliciter *sol, *nextsol;
1494
1495 if ((iflist[rainfo->ifindex]->ifm_flags & IFF_UP) == 0) {
1496 syslog(LOG_DEBUG, "<%s> %s is not up, skip sending RA",
1497 __func__, rainfo->ifname);
1498 return;
1499 }
1500
1501 make_packet(rainfo); /* XXX: inefficient */
1502
1503 sndmhdr.msg_name = (caddr_t)&sin6_allnodes;
1504 sndmhdr.msg_iov[0].iov_base = (caddr_t)rainfo->ra_data;
1505 sndmhdr.msg_iov[0].iov_len = rainfo->ra_datalen;
1506
1507 cm = CMSG_FIRSTHDR(&sndmhdr);
1508 /* specify the outgoing interface */
1509 cm->cmsg_level = IPPROTO_IPV6;
1510 cm->cmsg_type = IPV6_PKTINFO;
1511 cm->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
1512 pi = (struct in6_pktinfo *)CMSG_DATA(cm);
1513 memset(&pi->ipi6_addr, 0, sizeof(pi->ipi6_addr)); /*XXX*/
1514 pi->ipi6_ifindex = rainfo->ifindex;
1515
1516 /* specify the hop limit of the packet */
1517 {
1518 int hoplimit = 255;
1519
1520 cm = CMSG_NXTHDR(&sndmhdr, cm);
1521 cm->cmsg_level = IPPROTO_IPV6;
1522 cm->cmsg_type = IPV6_HOPLIMIT;
1523 cm->cmsg_len = CMSG_LEN(sizeof(int));
1524 memcpy(CMSG_DATA(cm), &hoplimit, sizeof(int));
1525 }
1526
1527 syslog(LOG_DEBUG,
1528 "<%s> send RA on %s, # of waitings = %d",
1529 __func__, rainfo->ifname, rainfo->waiting);
1530
1531 i = sendmsg(sock, &sndmhdr, 0);
1532
1533 if (i < 0 || i != rainfo->ra_datalen) {
1534 if (i < 0) {
1535 syslog(LOG_ERR, "<%s> sendmsg on %s: %s",
1536 __func__, rainfo->ifname,
1537 strerror(errno));
1538 }
1539 }
1540
1541 /*
1542 * unicast advertisements
1543 * XXX commented out. reason: though spec does not forbit it, unicast
1544 * advert does not really help
1545 */
1546 for (sol = rainfo->soliciter; sol; sol = nextsol) {
1547 nextsol = sol->next;
1548
1549 #if 0
1550 sndmhdr.msg_name = (caddr_t)&sol->addr;
1551 i = sendmsg(sock, &sndmhdr, 0);
1552 if (i < 0 || i != rainfo->ra_datalen) {
1553 if (i < 0) {
1554 syslog(LOG_ERR,
1555 "<%s> unicast sendmsg on %s: %s",
1556 __func__, rainfo->ifname,
1557 strerror(errno));
1558 }
1559 }
1560 #endif
1561
1562 sol->next = NULL;
1563 free(sol);
1564 }
1565 rainfo->soliciter = NULL;
1566
1567 /* update counter */
1568 if (rainfo->initcounter < MAX_INITIAL_RTR_ADVERTISEMENTS)
1569 rainfo->initcounter++;
1570 rainfo->raoutput++;
1571
1572 /* update timestamp */
1573 gettimeofday(&rainfo->lastsent, NULL);
1574
1575 /* reset waiting conter */
1576 rainfo->waiting = 0;
1577 }
1578
1579 /* process RA timer */
1580 struct rtadvd_timer *
1581 ra_timeout(void *data)
1582 {
1583 struct rainfo *rai = (struct rainfo *)data;
1584
1585 #ifdef notyet
1586 /* if necessary, reconstruct the packet. */
1587 #endif
1588
1589 syslog(LOG_DEBUG,
1590 "<%s> RA timer on %s is expired",
1591 __func__, rai->ifname);
1592
1593 ra_output(rai);
1594
1595 return(rai->timer);
1596 }
1597
1598 /* update RA timer */
1599 void
1600 ra_timer_update(void *data, struct timeval *tm)
1601 {
1602 struct rainfo *rai = (struct rainfo *)data;
1603 long interval;
1604
1605 /*
1606 * Whenever a multicast advertisement is sent from an interface,
1607 * the timer is reset to a uniformly-distributed random value
1608 * between the interface's configured MinRtrAdvInterval and
1609 * MaxRtrAdvInterval (RFC2461 6.2.4).
1610 */
1611 interval = rai->mininterval;
1612 interval += random() % (rai->maxinterval - rai->mininterval);
1613
1614 /*
1615 * For the first few advertisements (up to
1616 * MAX_INITIAL_RTR_ADVERTISEMENTS), if the randomly chosen interval
1617 * is greater than MAX_INITIAL_RTR_ADVERT_INTERVAL, the timer
1618 * SHOULD be set to MAX_INITIAL_RTR_ADVERT_INTERVAL instead.
1619 * (RFC-2461 6.2.4)
1620 */
1621 if (rai->initcounter < MAX_INITIAL_RTR_ADVERTISEMENTS &&
1622 interval > MAX_INITIAL_RTR_ADVERT_INTERVAL)
1623 interval = MAX_INITIAL_RTR_ADVERT_INTERVAL;
1624
1625 tm->tv_sec = interval;
1626 tm->tv_usec = 0;
1627
1628 syslog(LOG_DEBUG,
1629 "<%s> RA timer on %s is set to %ld:%ld",
1630 __func__, rai->ifname,
1631 (long int)tm->tv_sec, (long int)tm->tv_usec);
1632
1633 return;
1634 }
DragonFly BSD