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[apple/network_cmds.git] / rtadvd.tproj / rtadvd.c
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 1.3.2.2 2001/07/03 11:02:14 ume Exp $
32 */
33
34 #include <sys/param.h>
35 #include <sys/socket.h>
36 #include <sys/uio.h>
37 #include <sys/time.h>
38 #include <sys/queue.h>
39
40 #include <net/if.h>
41 #include <net/route.h>
42 #include <net/if_dl.h>
43 #include <netinet/in.h>
44 #include <netinet/ip6.h>
45 #include <netinet6/ip6_var.h>
46 #include <netinet/icmp6.h>
47
48 #include <arpa/inet.h>
49
50 #include <time.h>
51 #include <unistd.h>
52 #include <stdio.h>
53 #include <stdlib.h>
54 #include <err.h>
55 #include <errno.h>
56 #include <string.h>
57 #include <stdlib.h>
58 #include <syslog.h>
59 #include "rtadvd.h"
60 #include "rrenum.h"
61 #include "advcap.h"
62 #include "timer.h"
63 #include "if.h"
64 #include "config.h"
65 #include "dump.h"
66
67 struct msghdr rcvmhdr;
68 static u_char *rcvcmsgbuf;
69 static size_t rcvcmsgbuflen;
70 static u_char *sndcmsgbuf = NULL;
71 static size_t sndcmsgbuflen;
72 static int do_dump;
73 static int do_die;
74 struct msghdr sndmhdr;
75 struct iovec rcviov[2];
76 struct iovec sndiov[2];
77 struct sockaddr_in6 from;
78 struct sockaddr_in6 sin6_allnodes = {sizeof(sin6_allnodes), AF_INET6};
79 struct in6_addr in6a_site_allrouters;
80 static char *dumpfilename = "/var/run/rtadvd.dump"; /* XXX: should be configurable */
81 static char *pidfilename = "/var/run/rtadvd.pid"; /* should be configurable */
82 static char *mcastif;
83 int sock;
84 int rtsock = -1;
85 #ifdef MIP6
86 int mobileip6 = 0;
87 #endif
88 int accept_rr = 0;
89 int dflag = 0, sflag = 0;
90
91 u_char *conffile = NULL;
92
93 struct rainfo *ralist = NULL;
94 struct nd_optlist {
95 struct nd_optlist *next;
96 struct nd_opt_hdr *opt;
97 };
98 union nd_opts {
99 struct nd_opt_hdr *nd_opt_array[7];
100 struct {
101 struct nd_opt_hdr *zero;
102 struct nd_opt_hdr *src_lladdr;
103 struct nd_opt_hdr *tgt_lladdr;
104 struct nd_opt_prefix_info *pi;
105 struct nd_opt_rd_hdr *rh;
106 struct nd_opt_mtu *mtu;
107 struct nd_optlist *list;
108 } nd_opt_each;
109 };
110 #define nd_opts_src_lladdr nd_opt_each.src_lladdr
111 #define nd_opts_tgt_lladdr nd_opt_each.tgt_lladdr
112 #define nd_opts_pi nd_opt_each.pi
113 #define nd_opts_rh nd_opt_each.rh
114 #define nd_opts_mtu nd_opt_each.mtu
115 #define nd_opts_list nd_opt_each.list
116
117 #define NDOPT_FLAG_SRCLINKADDR 0x1
118 #define NDOPT_FLAG_TGTLINKADDR 0x2
119 #define NDOPT_FLAG_PREFIXINFO 0x4
120 #define NDOPT_FLAG_RDHDR 0x8
121 #define NDOPT_FLAG_MTU 0x10
122
123 u_int32_t ndopt_flags[] = {
124 0, NDOPT_FLAG_SRCLINKADDR, NDOPT_FLAG_TGTLINKADDR,
125 NDOPT_FLAG_PREFIXINFO, NDOPT_FLAG_RDHDR, NDOPT_FLAG_MTU
126 };
127
128 int main __P((int, char *[]));
129 static void set_die __P((int));
130 static void die __P((void));
131 static void sock_open __P((void));
132 static void rtsock_open __P((void));
133 static void rtadvd_input __P((void));
134 static void rs_input __P((int, struct nd_router_solicit *,
135 struct in6_pktinfo *, struct sockaddr_in6 *));
136 static void ra_input __P((int, struct nd_router_advert *,
137 struct in6_pktinfo *, struct sockaddr_in6 *));
138 static int prefix_check __P((struct nd_opt_prefix_info *, struct rainfo *,
139 struct sockaddr_in6 *));
140 static int nd6_options __P((struct nd_opt_hdr *, int,
141 union nd_opts *, u_int32_t));
142 static void free_ndopts __P((union nd_opts *));
143 static void ra_output __P((struct rainfo *));
144 static void rtmsg_input __P((void));
145 static void rtadvd_set_dump_file __P((void));
146
147 struct prefix *find_prefix __P((struct rainfo *, struct in6_addr *, int));
148
149 int
150 main(argc, argv)
151 int argc;
152 char *argv[];
153 {
154 fd_set fdset;
155 int maxfd = 0;
156 struct timeval *timeout;
157 int i, ch;
158 int fflag = 0;
159 FILE *pidfp;
160 pid_t pid;
161
162 openlog("rtadvd", LOG_NDELAY|LOG_PID, LOG_DAEMON);
163
164 /* get command line options and arguments */
165 #ifdef MIP6
166 #define OPTIONS "c:dDfM:mRs"
167 #else
168 #define OPTIONS "c:dDfM:Rs"
169 #endif
170 while ((ch = getopt(argc, argv, OPTIONS)) != -1) {
171 #undef OPTIONS
172 switch(ch) {
173 case 'c':
174 conffile = optarg;
175 break;
176 case 'd':
177 dflag = 1;
178 break;
179 case 'D':
180 dflag = 2;
181 break;
182 case 'f':
183 fflag = 1;
184 break;
185 case 'M':
186 mcastif = optarg;
187 break;
188 #ifdef MIP6
189 case 'm':
190 mobileip6 = 1;
191 break;
192 #endif
193 case 'R':
194 fprintf(stderr, "rtadvd: "
195 "the -R option is currently ignored.\n");
196 /* accept_rr = 1; */
197 /* run anyway... */
198 break;
199 case 's':
200 sflag = 1;
201 break;
202 }
203 }
204 argc -= optind;
205 argv += optind;
206 if (argc == 0) {
207 fprintf(stderr,
208 #ifdef MIP6
209 "usage: rtadvd [-dDfMmRs] [-c conffile] "
210 #else
211 "usage: rtadvd [-dDfMRs] [-c conffile] "
212 #endif
213 "interfaces...\n");
214 exit(1);
215 }
216
217 /* set log level */
218 if (dflag == 0)
219 (void)setlogmask(LOG_UPTO(LOG_ERR));
220 if (dflag == 1)
221 (void)setlogmask(LOG_UPTO(LOG_INFO));
222
223 /* timer initialization */
224 rtadvd_timer_init();
225
226 /* random value initialization */
227 srandom((u_long)time(NULL));
228
229 /* get iflist block from kernel */
230 init_iflist();
231
232 while (argc--)
233 getconfig(*argv++);
234
235 if (inet_pton(AF_INET6, ALLNODES, &sin6_allnodes.sin6_addr) != 1) {
236 fprintf(stderr, "fatal: inet_pton failed\n");
237 exit(1);
238 }
239 sock_open();
240
241 if (!fflag)
242 daemon(1, 0);
243
244 /* record the current PID */
245 pid = getpid();
246 if ((pidfp = fopen(pidfilename, "w")) == NULL)
247 syslog(LOG_ERR,
248 "<%s> failed to open a log file(%s), run anyway.",
249 __FUNCTION__, pidfilename);
250 else {
251 fprintf(pidfp, "%d\n", pid);
252 fclose(pidfp);
253 }
254
255 FD_ZERO(&fdset);
256 FD_SET(sock, &fdset);
257 maxfd = sock;
258 if (sflag == 0) {
259 rtsock_open();
260 FD_SET(rtsock, &fdset);
261 if (rtsock > sock)
262 maxfd = rtsock;
263 } else
264 rtsock = -1;
265
266 signal(SIGTERM, (void *)set_die);
267 signal(SIGUSR1, (void *)rtadvd_set_dump_file);
268
269 while (1) {
270 struct fd_set select_fd = fdset; /* reinitialize */
271
272 if (do_dump) { /* SIGUSR1 */
273 do_dump = 0;
274 rtadvd_dump_file(dumpfilename);
275 }
276
277 if (do_die) {
278 die();
279 /*NOTREACHED*/
280 }
281
282 /* timer expiration check and reset the timer */
283 timeout = rtadvd_check_timer();
284
285 if (timeout != NULL) {
286 syslog(LOG_DEBUG,
287 "<%s> set timer to %ld:%ld. waiting for "
288 "inputs or timeout",
289 __FUNCTION__,
290 (long int)timeout->tv_sec,
291 (long int)timeout->tv_usec);
292 } else {
293 syslog(LOG_DEBUG,
294 "<%s> there's no timer. waiting for inputs",
295 __FUNCTION__);
296 }
297
298 if ((i = select(maxfd + 1, &select_fd,
299 NULL, NULL, timeout)) < 0) {
300 /* EINTR would occur upon SIGUSR1 for status dump */
301 if (errno != EINTR)
302 syslog(LOG_ERR, "<%s> select: %s",
303 __FUNCTION__, strerror(errno));
304 continue;
305 }
306 if (i == 0) /* timeout */
307 continue;
308 if (rtsock != -1 && FD_ISSET(rtsock, &select_fd))
309 rtmsg_input();
310 if (FD_ISSET(sock, &select_fd))
311 rtadvd_input();
312 }
313 exit(0); /* NOTREACHED */
314 }
315
316 static void
317 rtadvd_set_dump_file()
318 {
319 do_dump = 1;
320 }
321
322 static void
323 set_die(sig)
324 int sig;
325 {
326 do_die = 1;
327 }
328
329 static void
330 die()
331 {
332 struct rainfo *ra;
333 int i;
334 const int retrans = MAX_FINAL_RTR_ADVERTISEMENTS;
335
336 if (dflag > 1) {
337 syslog(LOG_DEBUG, "<%s> cease to be an advertising router\n",
338 __FUNCTION__);
339 }
340
341 for (ra = ralist; ra; ra = ra->next) {
342 ra->lifetime = 0;
343 make_packet(ra);
344 }
345 for (i = 0; i < retrans; i++) {
346 for (ra = ralist; ra; ra = ra->next)
347 ra_output(ra);
348 sleep(MIN_DELAY_BETWEEN_RAS);
349 }
350 exit(0);
351 /*NOTREACHED*/
352 }
353
354 static void
355 rtmsg_input()
356 {
357 int n, type, ifindex = 0, plen;
358 size_t len;
359 char msg[2048], *next, *lim;
360 u_char ifname[IF_NAMESIZE];
361 struct prefix *prefix;
362 struct rainfo *rai;
363 struct in6_addr *addr;
364 char addrbuf[INET6_ADDRSTRLEN];
365
366 n = read(rtsock, msg, sizeof(msg));
367 if (dflag > 1) {
368 syslog(LOG_DEBUG,
369 "<%s> received a routing message "
370 "(type = %d, len = %d)",
371 __FUNCTION__,
372 rtmsg_type(msg), n);
373 }
374 if (n > rtmsg_len(msg)) {
375 /*
376 * This usually won't happen for messages received on
377 * a routing socket.
378 */
379 if (dflag > 1)
380 syslog(LOG_DEBUG,
381 "<%s> received data length is larger than"
382 "1st routing message len. multiple messages?"
383 " read %d bytes, but 1st msg len = %d",
384 __FUNCTION__, n, rtmsg_len(msg));
385 #if 0
386 /* adjust length */
387 n = rtmsg_len(msg);
388 #endif
389 }
390
391 lim = msg + n;
392 for (next = msg; next < lim; next += len) {
393 int oldifflags;
394
395 next = get_next_msg(next, lim, 0, &len,
396 RTADV_TYPE2BITMASK(RTM_ADD) |
397 RTADV_TYPE2BITMASK(RTM_DELETE) |
398 RTADV_TYPE2BITMASK(RTM_NEWADDR) |
399 RTADV_TYPE2BITMASK(RTM_DELADDR) |
400 RTADV_TYPE2BITMASK(RTM_IFINFO));
401 if (len == 0)
402 break;
403 type = rtmsg_type(next);
404 switch (type) {
405 case RTM_ADD:
406 case RTM_DELETE:
407 ifindex = get_rtm_ifindex(next);
408 break;
409 case RTM_NEWADDR:
410 case RTM_DELADDR:
411 ifindex = get_ifam_ifindex(next);
412 break;
413 case RTM_IFINFO:
414 ifindex = get_ifm_ifindex(next);
415 break;
416 default:
417 /* should not reach here */
418 if (dflag > 1) {
419 syslog(LOG_DEBUG,
420 "<%s:%d> unknown rtmsg %d on %s",
421 __FUNCTION__, __LINE__, type,
422 if_indextoname(ifindex, ifname));
423 }
424 continue;
425 }
426
427 if ((rai = if_indextorainfo(ifindex)) == NULL) {
428 if (dflag > 1) {
429 syslog(LOG_DEBUG,
430 "<%s> route changed on "
431 "non advertising interface(%s)",
432 __FUNCTION__,
433 if_indextoname(ifindex, ifname));
434 }
435 continue;
436 }
437 oldifflags = iflist[ifindex]->ifm_flags;
438
439 switch(type) {
440 case RTM_ADD:
441 /* init ifflags because it may have changed */
442 iflist[ifindex]->ifm_flags =
443 if_getflags(ifindex,
444 iflist[ifindex]->ifm_flags);
445
446 if (sflag)
447 break; /* we aren't interested in prefixes */
448
449 addr = get_addr(msg);
450 plen = get_prefixlen(msg);
451 /* sanity check for plen */
452 if (plen < 4 /* as RFC2373, prefixlen is at least 4 */
453 || plen > 127) {
454 syslog(LOG_INFO, "<%s> new interface route's"
455 "plen %d is invalid for a prefix",
456 __FUNCTION__, plen);
457 break;
458 }
459 prefix = find_prefix(rai, addr, plen);
460 if (prefix) {
461 if (dflag > 1) {
462 syslog(LOG_DEBUG,
463 "<%s> new prefix(%s/%d) "
464 "added on %s, "
465 "but it was already in list",
466 __FUNCTION__,
467 inet_ntop(AF_INET6,
468 addr, (char *)addrbuf,
469 INET6_ADDRSTRLEN),
470 plen,
471 rai->ifname);
472 }
473 break;
474 }
475 make_prefix(rai, ifindex, addr, plen);
476 break;
477 case RTM_DELETE:
478 /* init ifflags because it may have changed */
479 iflist[ifindex]->ifm_flags =
480 if_getflags(ifindex,
481 iflist[ifindex]->ifm_flags);
482
483 if (sflag)
484 break;
485
486 addr = get_addr(msg);
487 plen = get_prefixlen(msg);
488 /* sanity check for plen */
489 if (plen < 4 /* as RFC2373, prefixlen is at least 4 */
490 || plen > 127) {
491 syslog(LOG_INFO, "<%s> deleted interface"
492 "route's"
493 "plen %d is invalid for a prefix",
494 __FUNCTION__, plen);
495 break;
496 }
497 prefix = find_prefix(rai, addr, plen);
498 if (prefix == NULL) {
499 if (dflag > 1) {
500 syslog(LOG_DEBUG,
501 "<%s> prefix(%s/%d) was "
502 "deleted on %s, "
503 "but it was not in list",
504 __FUNCTION__,
505 inet_ntop(AF_INET6,
506 addr, (char *)addrbuf,
507 INET6_ADDRSTRLEN),
508 plen,
509 rai->ifname);
510 }
511 break;
512 }
513 delete_prefix(rai, prefix);
514 break;
515 case RTM_NEWADDR:
516 case RTM_DELADDR:
517 /* init ifflags because it may have changed */
518 iflist[ifindex]->ifm_flags =
519 if_getflags(ifindex,
520 iflist[ifindex]->ifm_flags);
521 break;
522 case RTM_IFINFO:
523 iflist[ifindex]->ifm_flags = get_ifm_flags(next);
524 break;
525 default:
526 /* should not reach here */
527 if (dflag > 1) {
528 syslog(LOG_DEBUG,
529 "<%s:%d> unknown rtmsg %d on %s",
530 __FUNCTION__, __LINE__, type,
531 if_indextoname(ifindex, ifname));
532 }
533 return;
534 }
535
536 /* check if an interface flag is changed */
537 if ((oldifflags & IFF_UP) != 0 && /* UP to DOWN */
538 (iflist[ifindex]->ifm_flags & IFF_UP) == 0) {
539 syslog(LOG_INFO,
540 "<%s> interface %s becomes down. stop timer.",
541 __FUNCTION__, rai->ifname);
542 rtadvd_remove_timer(&rai->timer);
543 }
544 else if ((oldifflags & IFF_UP) == 0 && /* DOWN to UP */
545 (iflist[ifindex]->ifm_flags & IFF_UP) != 0) {
546 syslog(LOG_INFO,
547 "<%s> interface %s becomes up. restart timer.",
548 __FUNCTION__, rai->ifname);
549
550 rai->initcounter = 0; /* reset the counter */
551 rai->waiting = 0; /* XXX */
552 rai->timer = rtadvd_add_timer(ra_timeout,
553 ra_timer_update,
554 rai, rai);
555 ra_timer_update((void *)rai, &rai->timer->tm);
556 rtadvd_set_timer(&rai->timer->tm, rai->timer);
557 }
558 }
559
560 return;
561 }
562
563 void
564 rtadvd_input()
565 {
566 int i;
567 int *hlimp = NULL;
568 #ifdef OLDRAWSOCKET
569 struct ip6_hdr *ip;
570 #endif
571 struct icmp6_hdr *icp;
572 int ifindex = 0;
573 struct cmsghdr *cm;
574 struct in6_pktinfo *pi = NULL;
575 u_char ntopbuf[INET6_ADDRSTRLEN], ifnamebuf[IFNAMSIZ];
576 struct in6_addr dst = in6addr_any;
577
578 /*
579 * Get message. We reset msg_controllen since the field could
580 * be modified if we had received a message before setting
581 * receive options.
582 */
583 rcvmhdr.msg_controllen = rcvcmsgbuflen;
584 if ((i = recvmsg(sock, &rcvmhdr, 0)) < 0)
585 return;
586
587 /* extract optional information via Advanced API */
588 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(&rcvmhdr);
589 cm;
590 cm = (struct cmsghdr *)CMSG_NXTHDR(&rcvmhdr, cm)) {
591 if (cm->cmsg_level == IPPROTO_IPV6 &&
592 cm->cmsg_type == IPV6_PKTINFO &&
593 cm->cmsg_len == CMSG_LEN(sizeof(struct in6_pktinfo))) {
594 pi = (struct in6_pktinfo *)(CMSG_DATA(cm));
595 ifindex = pi->ipi6_ifindex;
596 dst = pi->ipi6_addr;
597 }
598 if (cm->cmsg_level == IPPROTO_IPV6 &&
599 cm->cmsg_type == IPV6_HOPLIMIT &&
600 cm->cmsg_len == CMSG_LEN(sizeof(int)))
601 hlimp = (int *)CMSG_DATA(cm);
602 }
603 if (ifindex == 0) {
604 syslog(LOG_ERR,
605 "<%s> failed to get receiving interface",
606 __FUNCTION__);
607 return;
608 }
609 if (hlimp == NULL) {
610 syslog(LOG_ERR,
611 "<%s> failed to get receiving hop limit",
612 __FUNCTION__);
613 return;
614 }
615
616 /*
617 * If we happen to receive data on an interface which is now down,
618 * just discard the data.
619 */
620 if ((iflist[pi->ipi6_ifindex]->ifm_flags & IFF_UP) == 0) {
621 syslog(LOG_INFO,
622 "<%s> received data on a disabled interface (%s)",
623 __FUNCTION__,
624 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
625 return;
626 }
627
628 #ifdef OLDRAWSOCKET
629 if (i < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr)) {
630 syslog(LOG_ERR,
631 "<%s> packet size(%d) is too short",
632 __FUNCTION__, i);
633 return;
634 }
635
636 ip = (struct ip6_hdr *)rcvmhdr.msg_iov[0].iov_base;
637 icp = (struct icmp6_hdr *)(ip + 1); /* XXX: ext. hdr? */
638 #else
639 if (i < sizeof(struct icmp6_hdr)) {
640 syslog(LOG_ERR,
641 "<%s> packet size(%d) is too short",
642 __FUNCTION__, i);
643 return;
644 }
645
646 icp = (struct icmp6_hdr *)rcvmhdr.msg_iov[0].iov_base;
647 #endif
648
649 switch(icp->icmp6_type) {
650 case ND_ROUTER_SOLICIT:
651 /*
652 * Message verification - RFC-2461 6.1.1
653 * XXX: these checks must be done in the kernel as well,
654 * but we can't completely rely on them.
655 */
656 if (*hlimp != 255) {
657 syslog(LOG_NOTICE,
658 "<%s> RS with invalid hop limit(%d) "
659 "received from %s on %s",
660 __FUNCTION__, *hlimp,
661 inet_ntop(AF_INET6, &from.sin6_addr, ntopbuf,
662 INET6_ADDRSTRLEN),
663 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
664 return;
665 }
666 if (icp->icmp6_code) {
667 syslog(LOG_NOTICE,
668 "<%s> RS with invalid ICMP6 code(%d) "
669 "received from %s on %s",
670 __FUNCTION__, icp->icmp6_code,
671 inet_ntop(AF_INET6, &from.sin6_addr, ntopbuf,
672 INET6_ADDRSTRLEN),
673 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
674 return;
675 }
676 if (i < sizeof(struct nd_router_solicit)) {
677 syslog(LOG_NOTICE,
678 "<%s> RS from %s on %s does not have enough "
679 "length (len = %d)",
680 __FUNCTION__,
681 inet_ntop(AF_INET6, &from.sin6_addr, ntopbuf,
682 INET6_ADDRSTRLEN),
683 if_indextoname(pi->ipi6_ifindex, ifnamebuf), i);
684 return;
685 }
686 rs_input(i, (struct nd_router_solicit *)icp, pi, &from);
687 break;
688 case ND_ROUTER_ADVERT:
689 /*
690 * Message verification - RFC-2461 6.1.2
691 * XXX: there's a same dilemma as above...
692 */
693 if (*hlimp != 255) {
694 syslog(LOG_NOTICE,
695 "<%s> RA with invalid hop limit(%d) "
696 "received from %s on %s",
697 __FUNCTION__, *hlimp,
698 inet_ntop(AF_INET6, &from.sin6_addr, ntopbuf,
699 INET6_ADDRSTRLEN),
700 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
701 return;
702 }
703 if (icp->icmp6_code) {
704 syslog(LOG_NOTICE,
705 "<%s> RA with invalid ICMP6 code(%d) "
706 "received from %s on %s",
707 __FUNCTION__, icp->icmp6_code,
708 inet_ntop(AF_INET6, &from.sin6_addr, ntopbuf,
709 INET6_ADDRSTRLEN),
710 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
711 return;
712 }
713 if (i < sizeof(struct nd_router_advert)) {
714 syslog(LOG_NOTICE,
715 "<%s> RA from %s on %s does not have enough "
716 "length (len = %d)",
717 __FUNCTION__,
718 inet_ntop(AF_INET6, &from.sin6_addr, ntopbuf,
719 INET6_ADDRSTRLEN),
720 if_indextoname(pi->ipi6_ifindex, ifnamebuf), i);
721 return;
722 }
723 ra_input(i, (struct nd_router_advert *)icp, pi, &from);
724 break;
725 case ICMP6_ROUTER_RENUMBERING:
726 if (accept_rr == 0) {
727 syslog(LOG_ERR,
728 "<%s> received a router renumbering "
729 "message, but not allowed to be accepted",
730 __FUNCTION__);
731 break;
732 }
733 rr_input(i, (struct icmp6_router_renum *)icp, pi, &from,
734 &dst);
735 break;
736 default:
737 /*
738 * Note that this case is POSSIBLE, especially just
739 * after invocation of the daemon. This is because we
740 * could receive message after opening the socket and
741 * before setting ICMP6 type filter(see sock_open()).
742 */
743 syslog(LOG_ERR,
744 "<%s> invalid icmp type(%d)",
745 __FUNCTION__, icp->icmp6_type);
746 return;
747 }
748
749 return;
750 }
751
752 static void
753 rs_input(int len, struct nd_router_solicit *rs,
754 struct in6_pktinfo *pi, struct sockaddr_in6 *from)
755 {
756 u_char ntopbuf[INET6_ADDRSTRLEN], ifnamebuf[IFNAMSIZ];
757 union nd_opts ndopts;
758 struct rainfo *ra;
759
760 syslog(LOG_DEBUG,
761 "<%s> RS received from %s on %s",
762 __FUNCTION__,
763 inet_ntop(AF_INET6, &from->sin6_addr,
764 ntopbuf, INET6_ADDRSTRLEN),
765 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
766
767 /* ND option check */
768 memset(&ndopts, 0, sizeof(ndopts));
769 if (nd6_options((struct nd_opt_hdr *)(rs + 1),
770 len - sizeof(struct nd_router_solicit),
771 &ndopts, NDOPT_FLAG_SRCLINKADDR)) {
772 syslog(LOG_DEBUG,
773 "<%s> ND option check failed for an RS from %s on %s",
774 __FUNCTION__,
775 inet_ntop(AF_INET6, &from->sin6_addr,
776 ntopbuf, INET6_ADDRSTRLEN),
777 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
778 return;
779 }
780
781 /*
782 * If the IP source address is the unspecified address, there
783 * must be no source link-layer address option in the message.
784 * (RFC-2461 6.1.1)
785 */
786 if (IN6_IS_ADDR_UNSPECIFIED(&from->sin6_addr) &&
787 ndopts.nd_opts_src_lladdr) {
788 syslog(LOG_ERR,
789 "<%s> RS from unspecified src on %s has a link-layer"
790 " address option",
791 __FUNCTION__,
792 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
793 goto done;
794 }
795
796 ra = ralist;
797 while (ra != NULL) {
798 if (pi->ipi6_ifindex == ra->ifindex)
799 break;
800 ra = ra->next;
801 }
802 if (ra == NULL) {
803 syslog(LOG_INFO,
804 "<%s> RS received on non advertising interface(%s)",
805 __FUNCTION__,
806 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
807 goto done;
808 }
809
810 ra->rsinput++; /* increment statistics */
811
812 /*
813 * Decide whether to send RA according to the rate-limit
814 * consideration.
815 */
816 {
817 long delay; /* must not be greater than 1000000 */
818 struct timeval interval, now, min_delay, tm_tmp, *rest;
819 struct soliciter *sol;
820
821 /*
822 * record sockaddr waiting for RA, if possible
823 */
824 sol = (struct soliciter *)malloc(sizeof(*sol));
825 if (sol) {
826 sol->addr = *from;
827 /*XXX RFC2553 need clarification on flowinfo */
828 sol->addr.sin6_flowinfo = 0;
829 sol->next = ra->soliciter;
830 ra->soliciter = sol->next;
831 }
832
833 /*
834 * If there is already a waiting RS packet, don't
835 * update the timer.
836 */
837 if (ra->waiting++)
838 goto done;
839
840 /*
841 * Compute a random delay. If the computed value
842 * corresponds to a time later than the time the next
843 * multicast RA is scheduled to be sent, ignore the random
844 * delay and send the advertisement at the
845 * already-scheduled time. RFC-2461 6.2.6
846 */
847 delay = random() % MAX_RA_DELAY_TIME;
848 interval.tv_sec = 0;
849 interval.tv_usec = delay;
850 rest = rtadvd_timer_rest(ra->timer);
851 if (TIMEVAL_LT(*rest, interval)) {
852 syslog(LOG_DEBUG,
853 "<%s> random delay is larger than "
854 "the rest of normal timer",
855 __FUNCTION__);
856 interval = *rest;
857 }
858
859 /*
860 * If we sent a multicast Router Advertisement within
861 * the last MIN_DELAY_BETWEEN_RAS seconds, schedule
862 * the advertisement to be sent at a time corresponding to
863 * MIN_DELAY_BETWEEN_RAS plus the random value after the
864 * previous advertisement was sent.
865 */
866 gettimeofday(&now, NULL);
867 TIMEVAL_SUB(&now, &ra->lastsent, &tm_tmp);
868 min_delay.tv_sec = MIN_DELAY_BETWEEN_RAS;
869 min_delay.tv_usec = 0;
870 if (TIMEVAL_LT(tm_tmp, min_delay)) {
871 TIMEVAL_SUB(&min_delay, &tm_tmp, &min_delay);
872 TIMEVAL_ADD(&min_delay, &interval, &interval);
873 }
874 rtadvd_set_timer(&interval, ra->timer);
875 goto done;
876 }
877
878 done:
879 free_ndopts(&ndopts);
880 return;
881 }
882
883 static void
884 ra_input(int len, struct nd_router_advert *ra,
885 struct in6_pktinfo *pi, struct sockaddr_in6 *from)
886 {
887 struct rainfo *rai;
888 u_char ntopbuf[INET6_ADDRSTRLEN], ifnamebuf[IFNAMSIZ];
889 union nd_opts ndopts;
890 char *on_off[] = {"OFF", "ON"};
891 u_int32_t reachabletime, retranstimer, mtu;
892 int inconsistent = 0;
893
894 syslog(LOG_DEBUG,
895 "<%s> RA received from %s on %s",
896 __FUNCTION__,
897 inet_ntop(AF_INET6, &from->sin6_addr,
898 ntopbuf, INET6_ADDRSTRLEN),
899 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
900
901 /* ND option check */
902 memset(&ndopts, 0, sizeof(ndopts));
903 if (nd6_options((struct nd_opt_hdr *)(ra + 1),
904 len - sizeof(struct nd_router_advert),
905 &ndopts, NDOPT_FLAG_SRCLINKADDR |
906 NDOPT_FLAG_PREFIXINFO | NDOPT_FLAG_MTU)) {
907 syslog(LOG_ERR,
908 "<%s> ND option check failed for an RA from %s on %s",
909 __FUNCTION__,
910 inet_ntop(AF_INET6, &from->sin6_addr,
911 ntopbuf, INET6_ADDRSTRLEN),
912 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
913 return;
914 }
915
916 /*
917 * RA consistency check according to RFC-2461 6.2.7
918 */
919 if ((rai = if_indextorainfo(pi->ipi6_ifindex)) == 0) {
920 syslog(LOG_INFO,
921 "<%s> received RA from %s on non-advertising"
922 " interface(%s)",
923 __FUNCTION__,
924 inet_ntop(AF_INET6, &from->sin6_addr,
925 ntopbuf, INET6_ADDRSTRLEN),
926 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
927 goto done;
928 }
929 rai->rainput++; /* increment statistics */
930
931 /* Cur Hop Limit value */
932 if (ra->nd_ra_curhoplimit && rai->hoplimit &&
933 ra->nd_ra_curhoplimit != rai->hoplimit) {
934 syslog(LOG_INFO,
935 "<%s> CurHopLimit inconsistent on %s:"
936 " %d from %s, %d from us",
937 __FUNCTION__,
938 rai->ifname,
939 ra->nd_ra_curhoplimit,
940 inet_ntop(AF_INET6, &from->sin6_addr,
941 ntopbuf, INET6_ADDRSTRLEN),
942 rai->hoplimit);
943 inconsistent++;
944 }
945 /* M flag */
946 if ((ra->nd_ra_flags_reserved & ND_RA_FLAG_MANAGED) !=
947 rai->managedflg) {
948 syslog(LOG_INFO,
949 "<%s> M flag inconsistent on %s:"
950 " %s from %s, %s from us",
951 __FUNCTION__,
952 rai->ifname,
953 on_off[!rai->managedflg],
954 inet_ntop(AF_INET6, &from->sin6_addr,
955 ntopbuf, INET6_ADDRSTRLEN),
956 on_off[rai->managedflg]);
957 inconsistent++;
958 }
959 /* O flag */
960 if ((ra->nd_ra_flags_reserved & ND_RA_FLAG_OTHER) !=
961 rai->otherflg) {
962 syslog(LOG_INFO,
963 "<%s> O flag inconsistent on %s:"
964 " %s from %s, %s from us",
965 __FUNCTION__,
966 rai->ifname,
967 on_off[!rai->otherflg],
968 inet_ntop(AF_INET6, &from->sin6_addr,
969 ntopbuf, INET6_ADDRSTRLEN),
970 on_off[rai->otherflg]);
971 inconsistent++;
972 }
973 /* Reachable Time */
974 reachabletime = ntohl(ra->nd_ra_reachable);
975 if (reachabletime && rai->reachabletime &&
976 reachabletime != rai->reachabletime) {
977 syslog(LOG_INFO,
978 "<%s> ReachableTime inconsistent on %s:"
979 " %d from %s, %d from us",
980 __FUNCTION__,
981 rai->ifname,
982 reachabletime,
983 inet_ntop(AF_INET6, &from->sin6_addr,
984 ntopbuf, INET6_ADDRSTRLEN),
985 rai->reachabletime);
986 inconsistent++;
987 }
988 /* Retrans Timer */
989 retranstimer = ntohl(ra->nd_ra_retransmit);
990 if (retranstimer && rai->retranstimer &&
991 retranstimer != rai->retranstimer) {
992 syslog(LOG_INFO,
993 "<%s> RetranceTimer inconsistent on %s:"
994 " %d from %s, %d from us",
995 __FUNCTION__,
996 rai->ifname,
997 retranstimer,
998 inet_ntop(AF_INET6, &from->sin6_addr,
999 ntopbuf, INET6_ADDRSTRLEN),
1000 rai->retranstimer);
1001 inconsistent++;
1002 }
1003 /* Values in the MTU options */
1004 if (ndopts.nd_opts_mtu) {
1005 mtu = ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu);
1006 if (mtu && rai->linkmtu && mtu != rai->linkmtu) {
1007 syslog(LOG_INFO,
1008 "<%s> MTU option value inconsistent on %s:"
1009 " %d from %s, %d from us",
1010 __FUNCTION__,
1011 rai->ifname, mtu,
1012 inet_ntop(AF_INET6, &from->sin6_addr,
1013 ntopbuf, INET6_ADDRSTRLEN),
1014 rai->linkmtu);
1015 inconsistent++;
1016 }
1017 }
1018 /* Preferred and Valid Lifetimes for prefixes */
1019 {
1020 struct nd_optlist *optp = ndopts.nd_opts_list;
1021
1022 if (ndopts.nd_opts_pi) {
1023 if (prefix_check(ndopts.nd_opts_pi, rai, from))
1024 inconsistent++;
1025 }
1026 while (optp) {
1027 if (prefix_check((struct nd_opt_prefix_info *)optp->opt,
1028 rai, from))
1029 inconsistent++;
1030 optp = optp->next;
1031 }
1032 }
1033
1034 if (inconsistent)
1035 rai->rainconsistent++;
1036
1037 done:
1038 free_ndopts(&ndopts);
1039 return;
1040 }
1041
1042 /* return a non-zero value if the received prefix is inconsitent with ours */
1043 static int
1044 prefix_check(struct nd_opt_prefix_info *pinfo,
1045 struct rainfo *rai, struct sockaddr_in6 *from)
1046 {
1047 u_int32_t preferred_time, valid_time;
1048 struct prefix *pp;
1049 int inconsistent = 0;
1050 u_char ntopbuf[INET6_ADDRSTRLEN], prefixbuf[INET6_ADDRSTRLEN];
1051 struct timeval now;
1052
1053 #if 0 /* impossible */
1054 if (pinfo->nd_opt_pi_type != ND_OPT_PREFIX_INFORMATION)
1055 return(0);
1056 #endif
1057
1058 /*
1059 * log if the adveritsed prefix has link-local scope(sanity check?)
1060 */
1061 if (IN6_IS_ADDR_LINKLOCAL(&pinfo->nd_opt_pi_prefix)) {
1062 syslog(LOG_INFO,
1063 "<%s> link-local prefix %s/%d is advertised "
1064 "from %s on %s",
1065 __FUNCTION__,
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 }
1073
1074 if ((pp = find_prefix(rai, &pinfo->nd_opt_pi_prefix,
1075 pinfo->nd_opt_pi_prefix_len)) == NULL) {
1076 syslog(LOG_INFO,
1077 "<%s> prefix %s/%d from %s on %s is not in our list",
1078 __FUNCTION__,
1079 inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix,
1080 prefixbuf, INET6_ADDRSTRLEN),
1081 pinfo->nd_opt_pi_prefix_len,
1082 inet_ntop(AF_INET6, &from->sin6_addr,
1083 ntopbuf, INET6_ADDRSTRLEN),
1084 rai->ifname);
1085 return(0);
1086 }
1087
1088 preferred_time = ntohl(pinfo->nd_opt_pi_preferred_time);
1089 if (pp->pltimeexpire) {
1090 /*
1091 * The lifetime is decremented in real time, so we should
1092 * compare the expiration time.
1093 * (RFC 2461 Section 6.2.7.)
1094 * XXX: can we really expect that all routers on the link
1095 * have synchronized clocks?
1096 */
1097 gettimeofday(&now, NULL);
1098 preferred_time += now.tv_sec;
1099
1100 if (rai->clockskew &&
1101 abs(preferred_time - pp->pltimeexpire) > rai->clockskew) {
1102 syslog(LOG_INFO,
1103 "<%s> prefeerred lifetime for %s/%d"
1104 " (decr. in real time) inconsistent on %s:"
1105 " %d from %s, %ld from us",
1106 __FUNCTION__,
1107 inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix,
1108 prefixbuf, INET6_ADDRSTRLEN),
1109 pinfo->nd_opt_pi_prefix_len,
1110 rai->ifname, preferred_time,
1111 inet_ntop(AF_INET6, &from->sin6_addr,
1112 ntopbuf, INET6_ADDRSTRLEN),
1113 pp->pltimeexpire);
1114 inconsistent++;
1115 }
1116 }
1117 else if (preferred_time != pp->preflifetime) {
1118 syslog(LOG_INFO,
1119 "<%s> prefeerred lifetime for %s/%d"
1120 " inconsistent on %s:"
1121 " %d from %s, %d from us",
1122 __FUNCTION__,
1123 inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix,
1124 prefixbuf, INET6_ADDRSTRLEN),
1125 pinfo->nd_opt_pi_prefix_len,
1126 rai->ifname, preferred_time,
1127 inet_ntop(AF_INET6, &from->sin6_addr,
1128 ntopbuf, INET6_ADDRSTRLEN),
1129 pp->preflifetime);
1130 }
1131
1132 valid_time = ntohl(pinfo->nd_opt_pi_valid_time);
1133 if (pp->vltimeexpire) {
1134 gettimeofday(&now, NULL);
1135 valid_time += now.tv_sec;
1136
1137 if (rai->clockskew &&
1138 abs(valid_time - pp->vltimeexpire) > rai->clockskew) {
1139 syslog(LOG_INFO,
1140 "<%s> valid lifetime for %s/%d"
1141 " (decr. in real time) inconsistent on %s:"
1142 " %d from %s, %ld from us",
1143 __FUNCTION__,
1144 inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix,
1145 prefixbuf, INET6_ADDRSTRLEN),
1146 pinfo->nd_opt_pi_prefix_len,
1147 rai->ifname, preferred_time,
1148 inet_ntop(AF_INET6, &from->sin6_addr,
1149 ntopbuf, INET6_ADDRSTRLEN),
1150 pp->vltimeexpire);
1151 inconsistent++;
1152 }
1153 }
1154 else if (valid_time != pp->validlifetime) {
1155 syslog(LOG_INFO,
1156 "<%s> valid lifetime for %s/%d"
1157 " inconsistent on %s:"
1158 " %d from %s, %d from us",
1159 __FUNCTION__,
1160 inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix,
1161 prefixbuf, INET6_ADDRSTRLEN),
1162 pinfo->nd_opt_pi_prefix_len,
1163 rai->ifname, valid_time,
1164 inet_ntop(AF_INET6, &from->sin6_addr,
1165 ntopbuf, INET6_ADDRSTRLEN),
1166 pp->validlifetime);
1167 inconsistent++;
1168 }
1169
1170 return(inconsistent);
1171 }
1172
1173 struct prefix *
1174 find_prefix(struct rainfo *rai, struct in6_addr *prefix, int plen)
1175 {
1176 struct prefix *pp;
1177 int bytelen, bitlen;
1178
1179 for (pp = rai->prefix.next; pp != &rai->prefix; pp = pp->next) {
1180 if (plen != pp->prefixlen)
1181 continue;
1182 bytelen = plen / 8;
1183 bitlen = plen % 8;
1184 if (memcmp((void *)prefix, (void *)&pp->prefix, bytelen))
1185 continue;
1186 if (prefix->s6_addr[bytelen] >> (8 - bitlen) ==
1187 pp->prefix.s6_addr[bytelen] >> (8 - bitlen))
1188 return(pp);
1189 }
1190
1191 return(NULL);
1192 }
1193
1194 /* check if p0/plen0 matches p1/plen1; return 1 if matches, otherwise 0. */
1195 int
1196 prefix_match(struct in6_addr *p0, int plen0,
1197 struct in6_addr *p1, int plen1)
1198 {
1199 int bytelen, bitlen;
1200
1201 if (plen0 < plen1)
1202 return(0);
1203 bytelen = plen1 / 8;
1204 bitlen = plen1 % 8;
1205 if (memcmp((void *)p0, (void *)p1, bytelen))
1206 return(0);
1207 if (p0->s6_addr[bytelen] >> (8 - bitlen) ==
1208 p1->s6_addr[bytelen] >> (8 - bitlen))
1209 return(1);
1210
1211 return(0);
1212 }
1213
1214 static int
1215 nd6_options(struct nd_opt_hdr *hdr, int limit,
1216 union nd_opts *ndopts, u_int32_t optflags)
1217 {
1218 int optlen = 0;
1219
1220 for (; limit > 0; limit -= optlen) {
1221 hdr = (struct nd_opt_hdr *)((caddr_t)hdr + optlen);
1222 optlen = hdr->nd_opt_len << 3;
1223 if (hdr->nd_opt_len == 0) {
1224 syslog(LOG_ERR,
1225 "<%s> bad ND option length(0) (type = %d)",
1226 __FUNCTION__, hdr->nd_opt_type);
1227 goto bad;
1228 }
1229
1230 if (hdr->nd_opt_type > ND_OPT_MTU) {
1231 syslog(LOG_INFO,
1232 "<%s> unknown ND option(type %d)",
1233 __FUNCTION__,
1234 hdr->nd_opt_type);
1235 continue;
1236 }
1237
1238 if ((ndopt_flags[hdr->nd_opt_type] & optflags) == 0) {
1239 syslog(LOG_INFO,
1240 "<%s> unexpected ND option(type %d)",
1241 __FUNCTION__,
1242 hdr->nd_opt_type);
1243 continue;
1244 }
1245
1246 switch(hdr->nd_opt_type) {
1247 case ND_OPT_SOURCE_LINKADDR:
1248 case ND_OPT_TARGET_LINKADDR:
1249 case ND_OPT_REDIRECTED_HEADER:
1250 case ND_OPT_MTU:
1251 if (ndopts->nd_opt_array[hdr->nd_opt_type]) {
1252 syslog(LOG_INFO,
1253 "<%s> duplicated ND option"
1254 " (type = %d)",
1255 __FUNCTION__,
1256 hdr->nd_opt_type);
1257 }
1258 ndopts->nd_opt_array[hdr->nd_opt_type] = hdr;
1259 break;
1260 case ND_OPT_PREFIX_INFORMATION:
1261 {
1262 struct nd_optlist *pfxlist;
1263
1264 if (ndopts->nd_opts_pi == 0) {
1265 ndopts->nd_opts_pi =
1266 (struct nd_opt_prefix_info *)hdr;
1267 continue;
1268 }
1269 if ((pfxlist = malloc(sizeof(*pfxlist))) == NULL) {
1270 syslog(LOG_ERR,
1271 "<%s> can't allocate memory",
1272 __FUNCTION__);
1273 goto bad;
1274 }
1275 pfxlist->next = ndopts->nd_opts_list;
1276 pfxlist->opt = hdr;
1277 ndopts->nd_opts_list = pfxlist;
1278
1279 break;
1280 }
1281 default: /* impossible */
1282 break;
1283 }
1284 }
1285
1286 return(0);
1287
1288 bad:
1289 free_ndopts(ndopts);
1290
1291 return(-1);
1292 }
1293
1294 static void
1295 free_ndopts(union nd_opts *ndopts)
1296 {
1297 struct nd_optlist *opt = ndopts->nd_opts_list, *next;
1298
1299 while(opt) {
1300 next = opt->next;
1301 free(opt);
1302 opt = next;
1303 }
1304 }
1305
1306 void
1307 sock_open()
1308 {
1309 struct icmp6_filter filt;
1310 struct ipv6_mreq mreq;
1311 struct rainfo *ra = ralist;
1312 int on;
1313 /* XXX: should be max MTU attached to the node */
1314 static u_char answer[1500];
1315
1316 rcvcmsgbuflen = CMSG_SPACE(sizeof(struct in6_pktinfo)) +
1317 CMSG_SPACE(sizeof(int));
1318 rcvcmsgbuf = (u_char *)malloc(rcvcmsgbuflen);
1319 if (rcvcmsgbuf == NULL) {
1320 syslog(LOG_ERR, "<%s> not enough core", __FUNCTION__);
1321 exit(1);
1322 }
1323
1324 sndcmsgbuflen = CMSG_SPACE(sizeof(struct in6_pktinfo)) +
1325 CMSG_SPACE(sizeof(int));
1326 sndcmsgbuf = (u_char *)malloc(sndcmsgbuflen);
1327 if (sndcmsgbuf == NULL) {
1328 syslog(LOG_ERR, "<%s> not enough core", __FUNCTION__);
1329 exit(1);
1330 }
1331
1332 if ((sock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0) {
1333 syslog(LOG_ERR, "<%s> socket: %s", __FUNCTION__,
1334 strerror(errno));
1335 exit(1);
1336 }
1337
1338 /* specify to tell receiving interface */
1339 on = 1;
1340 #ifdef IPV6_RECVPKTINFO
1341 if (setsockopt(sock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &on,
1342 sizeof(on)) < 0) {
1343 syslog(LOG_ERR, "<%s> IPV6_RECVPKTINFO: %s",
1344 __FUNCTION__, strerror(errno));
1345 exit(1);
1346 }
1347 #else /* old adv. API */
1348 if (setsockopt(sock, IPPROTO_IPV6, IPV6_PKTINFO, &on,
1349 sizeof(on)) < 0) {
1350 syslog(LOG_ERR, "<%s> IPV6_PKTINFO: %s",
1351 __FUNCTION__, strerror(errno));
1352 exit(1);
1353 }
1354 #endif
1355
1356 on = 1;
1357 /* specify to tell value of hoplimit field of received IP6 hdr */
1358 #ifdef IPV6_RECVHOPLIMIT
1359 if (setsockopt(sock, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &on,
1360 sizeof(on)) < 0) {
1361 syslog(LOG_ERR, "<%s> IPV6_RECVHOPLIMIT: %s",
1362 __FUNCTION__, strerror(errno));
1363 exit(1);
1364 }
1365 #else /* old adv. API */
1366 if (setsockopt(sock, IPPROTO_IPV6, IPV6_HOPLIMIT, &on,
1367 sizeof(on)) < 0) {
1368 syslog(LOG_ERR, "<%s> IPV6_HOPLIMIT: %s",
1369 __FUNCTION__, strerror(errno));
1370 exit(1);
1371 }
1372 #endif
1373
1374 ICMP6_FILTER_SETBLOCKALL(&filt);
1375 ICMP6_FILTER_SETPASS(ND_ROUTER_SOLICIT, &filt);
1376 ICMP6_FILTER_SETPASS(ND_ROUTER_ADVERT, &filt);
1377 if (accept_rr)
1378 ICMP6_FILTER_SETPASS(ICMP6_ROUTER_RENUMBERING, &filt);
1379 if (setsockopt(sock, IPPROTO_ICMPV6, ICMP6_FILTER, &filt,
1380 sizeof(filt)) < 0) {
1381 syslog(LOG_ERR, "<%s> IICMP6_FILTER: %s",
1382 __FUNCTION__, strerror(errno));
1383 exit(1);
1384 }
1385
1386 /*
1387 * join all routers multicast address on each advertising interface.
1388 */
1389 if (inet_pton(AF_INET6, ALLROUTERS_LINK,
1390 &mreq.ipv6mr_multiaddr.s6_addr)
1391 != 1) {
1392 syslog(LOG_ERR, "<%s> inet_pton failed(library bug?)",
1393 __FUNCTION__);
1394 exit(1);
1395 }
1396 while(ra) {
1397 mreq.ipv6mr_interface = ra->ifindex;
1398 if (setsockopt(sock, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq,
1399 sizeof(mreq)) < 0) {
1400 syslog(LOG_ERR, "<%s> IPV6_JOIN_GROUP(link) on %s: %s",
1401 __FUNCTION__, ra->ifname, strerror(errno));
1402 exit(1);
1403 }
1404 ra = ra->next;
1405 }
1406
1407 /*
1408 * When attending router renumbering, join all-routers site-local
1409 * multicast group.
1410 */
1411 if (accept_rr) {
1412 if (inet_pton(AF_INET6, ALLROUTERS_SITE,
1413 &in6a_site_allrouters) != 1) {
1414 syslog(LOG_ERR, "<%s> inet_pton failed(library bug?)",
1415 __FUNCTION__);
1416 exit(1);
1417 }
1418 mreq.ipv6mr_multiaddr = in6a_site_allrouters;
1419 if (mcastif) {
1420 if ((mreq.ipv6mr_interface = if_nametoindex(mcastif))
1421 == 0) {
1422 syslog(LOG_ERR,
1423 "<%s> invalid interface: %s",
1424 __FUNCTION__, mcastif);
1425 exit(1);
1426 }
1427 } else
1428 mreq.ipv6mr_interface = ralist->ifindex;
1429 if (setsockopt(sock, IPPROTO_IPV6, IPV6_JOIN_GROUP,
1430 &mreq, sizeof(mreq)) < 0) {
1431 syslog(LOG_ERR,
1432 "<%s> IPV6_JOIN_GROUP(site) on %s: %s",
1433 __FUNCTION__,
1434 mcastif ? mcastif : ralist->ifname,
1435 strerror(errno));
1436 exit(1);
1437 }
1438 }
1439
1440 /* initialize msghdr for receiving packets */
1441 rcviov[0].iov_base = (caddr_t)answer;
1442 rcviov[0].iov_len = sizeof(answer);
1443 rcvmhdr.msg_name = (caddr_t)&from;
1444 rcvmhdr.msg_namelen = sizeof(from);
1445 rcvmhdr.msg_iov = rcviov;
1446 rcvmhdr.msg_iovlen = 1;
1447 rcvmhdr.msg_control = (caddr_t) rcvcmsgbuf;
1448 rcvmhdr.msg_controllen = rcvcmsgbuflen;
1449
1450 /* initialize msghdr for sending packets */
1451 sndmhdr.msg_namelen = sizeof(struct sockaddr_in6);
1452 sndmhdr.msg_iov = sndiov;
1453 sndmhdr.msg_iovlen = 1;
1454 sndmhdr.msg_control = (caddr_t)sndcmsgbuf;
1455 sndmhdr.msg_controllen = sndcmsgbuflen;
1456
1457 return;
1458 }
1459
1460 /* open a routing socket to watch the routing table */
1461 static void
1462 rtsock_open()
1463 {
1464 if ((rtsock = socket(PF_ROUTE, SOCK_RAW, 0)) < 0) {
1465 syslog(LOG_ERR,
1466 "<%s> socket: %s", __FUNCTION__, strerror(errno));
1467 exit(1);
1468 }
1469 }
1470
1471 struct rainfo *
1472 if_indextorainfo(int index)
1473 {
1474 struct rainfo *rai = ralist;
1475
1476 for (rai = ralist; rai; rai = rai->next) {
1477 if (rai->ifindex == index)
1478 return(rai);
1479 }
1480
1481 return(NULL); /* search failed */
1482 }
1483
1484 static void
1485 ra_output(rainfo)
1486 struct rainfo *rainfo;
1487 {
1488 int i;
1489 struct cmsghdr *cm;
1490 struct in6_pktinfo *pi;
1491 struct soliciter *sol, *nextsol;
1492
1493 if ((iflist[rainfo->ifindex]->ifm_flags & IFF_UP) == 0) {
1494 syslog(LOG_DEBUG, "<%s> %s is not up, skip sending RA",
1495 __FUNCTION__, rainfo->ifname);
1496 return;
1497 }
1498
1499 make_packet(rainfo); /* XXX: inefficient */
1500
1501 sndmhdr.msg_name = (caddr_t)&sin6_allnodes;
1502 sndmhdr.msg_iov[0].iov_base = (caddr_t)rainfo->ra_data;
1503 sndmhdr.msg_iov[0].iov_len = rainfo->ra_datalen;
1504
1505 cm = CMSG_FIRSTHDR(&sndmhdr);
1506 /* specify the outgoing interface */
1507 cm->cmsg_level = IPPROTO_IPV6;
1508 cm->cmsg_type = IPV6_PKTINFO;
1509 cm->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
1510 pi = (struct in6_pktinfo *)CMSG_DATA(cm);
1511 memset(&pi->ipi6_addr, 0, sizeof(pi->ipi6_addr)); /*XXX*/
1512 pi->ipi6_ifindex = rainfo->ifindex;
1513
1514 /* specify the hop limit of the packet */
1515 {
1516 int hoplimit = 255;
1517
1518 cm = CMSG_NXTHDR(&sndmhdr, cm);
1519 cm->cmsg_level = IPPROTO_IPV6;
1520 cm->cmsg_type = IPV6_HOPLIMIT;
1521 cm->cmsg_len = CMSG_LEN(sizeof(int));
1522 memcpy(CMSG_DATA(cm), &hoplimit, sizeof(int));
1523 }
1524
1525 syslog(LOG_DEBUG,
1526 "<%s> send RA on %s, # of waitings = %d",
1527 __FUNCTION__, rainfo->ifname, rainfo->waiting);
1528
1529 i = sendmsg(sock, &sndmhdr, 0);
1530
1531 if (i < 0 || i != rainfo->ra_datalen) {
1532 if (i < 0) {
1533 syslog(LOG_ERR, "<%s> sendmsg on %s: %s",
1534 __FUNCTION__, rainfo->ifname,
1535 strerror(errno));
1536 }
1537 }
1538
1539 /*
1540 * unicast advertisements
1541 * XXX commented out. reason: though spec does not forbit it, unicast
1542 * advert does not really help
1543 */
1544 for (sol = rainfo->soliciter; sol; sol = nextsol) {
1545 nextsol = sol->next;
1546
1547 #if 0
1548 sndmhdr.msg_name = (caddr_t)&sol->addr;
1549 i = sendmsg(sock, &sndmhdr, 0);
1550 if (i < 0 || i != rainfo->ra_datalen) {
1551 if (i < 0) {
1552 syslog(LOG_ERR,
1553 "<%s> unicast sendmsg on %s: %s",
1554 __FUNCTION__, rainfo->ifname,
1555 strerror(errno));
1556 }
1557 }
1558 #endif
1559
1560 sol->next = NULL;
1561 free(sol);
1562 }
1563 rainfo->soliciter = NULL;
1564
1565 /* update counter */
1566 if (rainfo->initcounter < MAX_INITIAL_RTR_ADVERTISEMENTS)
1567 rainfo->initcounter++;
1568 rainfo->raoutput++;
1569
1570 /* update timestamp */
1571 gettimeofday(&rainfo->lastsent, NULL);
1572
1573 /* reset waiting conter */
1574 rainfo->waiting = 0;
1575 }
1576
1577 /* process RA timer */
1578 void
1579 ra_timeout(void *data)
1580 {
1581 struct rainfo *rai = (struct rainfo *)data;
1582
1583 #ifdef notyet
1584 /* if necessary, reconstruct the packet. */
1585 #endif
1586
1587 syslog(LOG_DEBUG,
1588 "<%s> RA timer on %s is expired",
1589 __FUNCTION__, rai->ifname);
1590
1591 ra_output(rai);
1592 }
1593
1594 /* update RA timer */
1595 void
1596 ra_timer_update(void *data, struct timeval *tm)
1597 {
1598 struct rainfo *rai = (struct rainfo *)data;
1599 long interval;
1600
1601 /*
1602 * Whenever a multicast advertisement is sent from an interface,
1603 * the timer is reset to a uniformly-distributed random value
1604 * between the interface's configured MinRtrAdvInterval and
1605 * MaxRtrAdvInterval (RFC2461 6.2.4).
1606 */
1607 interval = rai->mininterval;
1608 interval += random() % (rai->maxinterval - rai->mininterval);
1609
1610 /*
1611 * For the first few advertisements (up to
1612 * MAX_INITIAL_RTR_ADVERTISEMENTS), if the randomly chosen interval
1613 * is greater than MAX_INITIAL_RTR_ADVERT_INTERVAL, the timer
1614 * SHOULD be set to MAX_INITIAL_RTR_ADVERT_INTERVAL instead.
1615 * (RFC-2461 6.2.4)
1616 */
1617 if (rai->initcounter < MAX_INITIAL_RTR_ADVERTISEMENTS &&
1618 interval > MAX_INITIAL_RTR_ADVERT_INTERVAL)
1619 interval = MAX_INITIAL_RTR_ADVERT_INTERVAL;
1620
1621 tm->tv_sec = interval;
1622 tm->tv_usec = 0;
1623
1624 syslog(LOG_DEBUG,
1625 "<%s> RA timer on %s is set to %ld:%ld",
1626 __FUNCTION__, rai->ifname,
1627 (long int)tm->tv_sec, (long int)tm->tv_usec);
1628
1629 return;
1630 }
mirror of network_cmds