]> git.saurik.com Git - apple/network_cmds.git/blob - rtadvd.tproj/rtadvd.c
projects / apple / network_cmds.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
network_cmds-511.50.3.tar.gz
[apple/network_cmds.git] / rtadvd.tproj / rtadvd.c
1 /* $KAME: rtadvd.c,v 1.82 2003/08/05 12:34:23 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
32 #include <sys/param.h>
33 #include <sys/socket.h>
34 #include <sys/uio.h>
35 #include <sys/time.h>
36 #include <sys/queue.h>
37
38 #include <net/if.h>
39 #include <net/route.h>
40 #include <net/if_dl.h>
41 #include <netinet/in.h>
42 #include <netinet/ip6.h>
43 #include <netinet6/ip6_var.h>
44 #include <netinet/icmp6.h>
45
46 #include <arpa/inet.h>
47
48 #include <time.h>
49 #include <unistd.h>
50 #include <stdio.h>
51 #include <stdlib.h>
52 #include <err.h>
53 #include <errno.h>
54 #include <libutil.h>
55 #include <string.h>
56 #include <stdlib.h>
57 #include <syslog.h>
58 #include "rtadvd.h"
59 #include "rrenum.h"
60 #include "advcap.h"
61 #include "timer.h"
62 #include "if.h"
63 #include "config.h"
64 #include "dump.h"
65
66 struct msghdr rcvmhdr;
67 static u_char *rcvcmsgbuf;
68 static size_t rcvcmsgbuflen;
69 static u_char *sndcmsgbuf = NULL;
70 static size_t sndcmsgbuflen;
71 volatile sig_atomic_t do_dump;
72 volatile sig_atomic_t do_die;
73 struct msghdr sndmhdr;
74 struct iovec rcviov[2];
75 struct iovec sndiov[2];
76 struct sockaddr_in6 rcvfrom;
77 struct sockaddr_in6 sin6_allnodes = {sizeof(sin6_allnodes), AF_INET6};
78 struct in6_addr in6a_site_allrouters;
79 static char *dumpfilename = "/var/run/rtadvd.dump";
80 static char *pidfilename = "/var/run/rtadvd.pid";
81 static struct pidfh *pfh;
82 static char *mcastif;
83 int sock;
84 int rtsock = -1;
85 int accept_rr = 0;
86 int dflag = 0, sflag = 0;
87 int so_traffic_class = SO_TC_CTL; /* use control class, by default */
88
89 char *conffile = NULL;
90
91 struct rainfo *ralist = NULL;
92 struct nd_optlist {
93 struct nd_optlist *next;
94 struct nd_opt_hdr *opt;
95 };
96 union nd_opts {
97 struct nd_opt_hdr *nd_opt_array[9];
98 struct {
99 struct nd_opt_hdr *zero;
100 struct nd_opt_hdr *src_lladdr;
101 struct nd_opt_hdr *tgt_lladdr;
102 struct nd_opt_prefix_info *pi;
103 struct nd_opt_rd_hdr *rh;
104 struct nd_opt_mtu *mtu;
105 struct nd_optlist *list;
106 } nd_opt_each;
107 };
108 #define nd_opts_src_lladdr nd_opt_each.src_lladdr
109 #define nd_opts_tgt_lladdr nd_opt_each.tgt_lladdr
110 #define nd_opts_pi nd_opt_each.pi
111 #define nd_opts_rh nd_opt_each.rh
112 #define nd_opts_mtu nd_opt_each.mtu
113 #define nd_opts_list nd_opt_each.list
114
115 #define NDOPT_FLAG_SRCLINKADDR 0x1
116 #define NDOPT_FLAG_TGTLINKADDR 0x2
117 #define NDOPT_FLAG_PREFIXINFO 0x4
118 #define NDOPT_FLAG_RDHDR 0x8
119 #define NDOPT_FLAG_MTU 0x10
120
121 u_int32_t ndopt_flags[] = {
122 0, NDOPT_FLAG_SRCLINKADDR, NDOPT_FLAG_TGTLINKADDR,
123 NDOPT_FLAG_PREFIXINFO, NDOPT_FLAG_RDHDR, NDOPT_FLAG_MTU,
124 };
125
126 int main(int, char *[]);
127 static void set_die(int);
128 static void die(void);
129 static void sock_open(void);
130 static void rtsock_open(void);
131 static void rtadvd_input(void);
132 static void rs_input(int, struct nd_router_solicit *,
133 struct in6_pktinfo *, struct sockaddr_in6 *);
134 static void ra_input(int, struct nd_router_advert *,
135 struct in6_pktinfo *, struct sockaddr_in6 *);
136 static int prefix_check(struct nd_opt_prefix_info *, struct rainfo *,
137 struct sockaddr_in6 *);
138 static int nd6_options(struct nd_opt_hdr *, int,
139 union nd_opts *, u_int32_t);
140 static void free_ndopts(union nd_opts *);
141 static void ra_output(struct rainfo *);
142 static void rtmsg_input(void);
143 static void rtadvd_set_dump_file(int);
144 static void set_short_delay(struct rainfo *);
145
146 int
147 main(argc, argv)
148 int argc;
149 char *argv[];
150 {
151 fd_set *fdsetp, *selectfdp;
152 int fdmasks;
153 int maxfd = 0;
154 struct timeval *timeout;
155 int i, ch;
156 int fflag = 0, logopt;
157 pid_t pid, otherpid;
158
159 /* get command line options and arguments */
160 while ((ch = getopt(argc, argv, "c:dDF:fMp:Rs")) != -1) {
161 switch (ch) {
162 case 'c':
163 conffile = optarg;
164 break;
165 case 'd':
166 dflag = 1;
167 break;
168 case 'D':
169 dflag = 2;
170 break;
171 case 'f':
172 fflag = 1;
173 break;
174 case 'M':
175 mcastif = optarg;
176 break;
177 case 'R':
178 fprintf(stderr, "rtadvd: "
179 "the -R option is currently ignored.\n");
180 /* accept_rr = 1; */
181 /* run anyway... */
182 break;
183 case 's':
184 sflag = 1;
185 break;
186 case 'p':
187 pidfilename = optarg;
188 break;
189 case 'F':
190 dumpfilename = optarg;
191 break;
192 }
193 }
194 argc -= optind;
195 argv += optind;
196 if (argc == 0) {
197 fprintf(stderr,
198 "usage: rtadvd [-dDfMRs] [-c conffile] "
199 "[-F dumpfile] [-p pidfile] interfaces...\n");
200 exit(1);
201 }
202
203 logopt = LOG_NDELAY | LOG_PID;
204 if (fflag)
205 logopt |= LOG_PERROR;
206 openlog("rtadvd", logopt, LOG_DAEMON);
207
208 /* set log level */
209 if (dflag == 0)
210 (void)setlogmask(LOG_UPTO(LOG_ERR));
211 if (dflag == 1)
212 (void)setlogmask(LOG_UPTO(LOG_INFO));
213
214 /* timer initialization */
215 rtadvd_timer_init();
216
217 /* random value initialization */
218 srandom((u_long)time(NULL));
219
220 /* get iflist block from kernel */
221 init_iflist();
222
223 while (argc--)
224 getconfig(*argv++);
225
226 if (inet_pton(AF_INET6, ALLNODES, &sin6_allnodes.sin6_addr) != 1) {
227 fprintf(stderr, "fatal: inet_pton failed\n");
228 exit(1);
229 }
230
231 pfh = pidfile_open(pidfilename, 0600, &otherpid);
232 if (pfh == NULL) {
233 if (errno == EEXIST)
234 errx(1, "%s already running, pid: %d",
235 getprogname(), otherpid);
236 syslog(LOG_ERR,
237 "<%s> failed to open the pid log file, run anyway.",
238 __func__);
239 }
240
241 if (!fflag)
242 daemon(1, 0);
243
244 sock_open();
245
246 /* record the current PID */
247 pid = getpid();
248 pidfile_write(pfh);
249
250 maxfd = sock;
251 if (sflag == 0) {
252 rtsock_open();
253 if (rtsock > sock)
254 maxfd = rtsock;
255 } else
256 rtsock = -1;
257
258 fdmasks = howmany(maxfd + 1, NFDBITS) * sizeof(fd_mask);
259 if ((fdsetp = malloc(fdmasks)) == NULL) {
260 err(1, "malloc");
261 /*NOTREACHED*/
262 }
263 if ((selectfdp = malloc(fdmasks)) == NULL) {
264 err(1, "malloc");
265 /*NOTREACHED*/
266 }
267 memset(fdsetp, 0, fdmasks);
268 FD_SET(sock, fdsetp);
269 if (rtsock >= 0)
270 FD_SET(rtsock, fdsetp);
271
272 signal(SIGTERM, set_die);
273 signal(SIGUSR1, rtadvd_set_dump_file);
274
275 while (1) {
276 memcpy(selectfdp, fdsetp, fdmasks); /* reinitialize */
277
278 if (do_dump) { /* SIGUSR1 */
279 do_dump = 0;
280 rtadvd_dump_file(dumpfilename);
281 }
282
283 if (do_die) {
284 die();
285 /*NOTREACHED*/
286 }
287
288 /* timer expiration check and reset the timer */
289 timeout = rtadvd_check_timer();
290
291 if (timeout != NULL) {
292 syslog(LOG_DEBUG,
293 "<%s> set timer to %ld:%ld. waiting for "
294 "inputs or timeout", __func__,
295 (long int)timeout->tv_sec,
296 (long int)timeout->tv_usec);
297 } else {
298 syslog(LOG_DEBUG,
299 "<%s> there's no timer. waiting for inputs",
300 __func__);
301 }
302
303 if ((i = select(maxfd + 1, selectfdp, NULL, NULL,
304 timeout)) < 0) {
305 /* EINTR would occur upon SIGUSR1 for status dump */
306 if (errno != EINTR)
307 syslog(LOG_ERR, "<%s> select: %s",
308 __func__, strerror(errno));
309 continue;
310 }
311 if (i == 0) /* timeout */
312 continue;
313 if (rtsock != -1 && FD_ISSET(rtsock, selectfdp))
314 rtmsg_input();
315 if (FD_ISSET(sock, selectfdp))
316 rtadvd_input();
317 }
318 exit(0); /* NOTREACHED */
319 }
320
321 static void
322 rtadvd_set_dump_file(sig)
323 int sig;
324 {
325 do_dump = 1;
326 }
327
328 static void
329 set_die(sig)
330 int sig;
331 {
332 do_die = 1;
333 }
334
335 static void
336 die()
337 {
338 struct rainfo *ra;
339 int i;
340 const int retrans = MAX_FINAL_RTR_ADVERTISEMENTS;
341
342 if (dflag > 1) {
343 syslog(LOG_DEBUG, "<%s> cease to be an advertising router\n",
344 __func__);
345 }
346
347 for (ra = ralist; ra; ra = ra->next) {
348 ra->lifetime = 0;
349 make_packet(ra);
350 }
351 for (i = 0; i < retrans; i++) {
352 for (ra = ralist; ra; ra = ra->next)
353 ra_output(ra);
354
355 if (retrans != 1)
356 sleep(MIN_DELAY_BETWEEN_RAS);
357 }
358 pidfile_remove(pfh);
359 exit(0);
360 /*NOTREACHED*/
361 }
362
363 static void
364 rtmsg_input()
365 {
366 int n, type, ifindex = 0, plen;
367 size_t len;
368 char msg[2048], *next, *lim;
369 char ifname[IF_NAMESIZE];
370 struct prefix *prefix;
371 struct rainfo *rai;
372 struct in6_addr *addr;
373 char addrbuf[INET6_ADDRSTRLEN];
374 int prefixchange = 0;
375
376 n = read(rtsock, msg, sizeof(msg));
377 if (dflag > 1) {
378 syslog(LOG_DEBUG, "<%s> received a routing message "
379 "(type = %d, len = %d)", __func__, rtmsg_type(msg), n);
380 }
381 if (n > rtmsg_len(msg)) {
382 /*
383 * This usually won't happen for messages received on
384 * a routing socket.
385 */
386 if (dflag > 1)
387 syslog(LOG_DEBUG,
388 "<%s> received data length is larger than "
389 "1st routing message len. multiple messages? "
390 "read %d bytes, but 1st msg len = %d",
391 __func__, n, rtmsg_len(msg));
392 #if 0
393 /* adjust length */
394 n = rtmsg_len(msg);
395 #endif
396 }
397
398 lim = msg + n;
399 for (next = msg; next < lim; next += len) {
400 int oldifflags;
401
402 next = get_next_msg(next, lim, 0, &len,
403 RTADV_TYPE2BITMASK(RTM_ADD) |
404 RTADV_TYPE2BITMASK(RTM_DELETE) |
405 RTADV_TYPE2BITMASK(RTM_NEWADDR) |
406 RTADV_TYPE2BITMASK(RTM_DELADDR) |
407 RTADV_TYPE2BITMASK(RTM_IFINFO));
408 if (len == 0)
409 break;
410 type = rtmsg_type(next);
411 switch (type) {
412 case RTM_ADD:
413 case RTM_DELETE:
414 ifindex = get_rtm_ifindex(next);
415 break;
416 case RTM_NEWADDR:
417 case RTM_DELADDR:
418 ifindex = get_ifam_ifindex(next);
419 break;
420 case RTM_IFINFO:
421 ifindex = get_ifm_ifindex(next);
422 break;
423 default:
424 /* should not reach here */
425 if (dflag > 1) {
426 syslog(LOG_DEBUG,
427 "<%s:%d> unknown rtmsg %d on %s",
428 __func__, __LINE__, type,
429 if_indextoname(ifindex, ifname));
430 }
431 continue;
432 }
433
434 if ((rai = if_indextorainfo(ifindex)) == NULL) {
435 if (dflag > 1) {
436 syslog(LOG_DEBUG,
437 "<%s> route changed on "
438 "non advertising interface(%s)",
439 __func__,
440 if_indextoname(ifindex, ifname));
441 }
442 continue;
443 }
444 oldifflags = iflist[ifindex]->ifm_flags;
445
446 switch (type) {
447 case RTM_ADD:
448 /* init ifflags because it may have changed */
449 iflist[ifindex]->ifm_flags =
450 if_getflags(ifindex, iflist[ifindex]->ifm_flags);
451
452 if (sflag)
453 break; /* we aren't interested in prefixes */
454
455 addr = get_addr(msg);
456 plen = get_prefixlen(msg);
457 /* sanity check for plen */
458 /* as RFC2373, prefixlen is at least 4 */
459 if (plen < 4 || plen > 127) {
460 syslog(LOG_INFO, "<%s> new interface route's"
461 "plen %d is invalid for a prefix",
462 __func__, plen);
463 break;
464 }
465 prefix = find_prefix(rai, addr, plen);
466 if (prefix) {
467 if (prefix->timer) {
468 /*
469 * If the prefix has been invalidated,
470 * make it available again.
471 */
472 update_prefix(prefix);
473 prefixchange = 1;
474 } else if (dflag > 1) {
475 syslog(LOG_DEBUG,
476 "<%s> new prefix(%s/%d) "
477 "added on %s, "
478 "but it was already in list",
479 __func__,
480 inet_ntop(AF_INET6, addr,
481 (char *)addrbuf, INET6_ADDRSTRLEN),
482 plen, rai->ifname);
483 }
484 break;
485 }
486 make_prefix(rai, ifindex, addr, plen);
487 prefixchange = 1;
488 break;
489 case RTM_DELETE:
490 /* init ifflags because it may have changed */
491 iflist[ifindex]->ifm_flags =
492 if_getflags(ifindex, iflist[ifindex]->ifm_flags);
493
494 if (sflag)
495 break;
496
497 addr = get_addr(msg);
498 plen = get_prefixlen(msg);
499 /* sanity check for plen */
500 /* as RFC2373, prefixlen is at least 4 */
501 if (plen < 4 || plen > 127) {
502 syslog(LOG_INFO,
503 "<%s> deleted interface route's "
504 "plen %d is invalid for a prefix",
505 __func__, plen);
506 break;
507 }
508 prefix = find_prefix(rai, addr, plen);
509 if (prefix == NULL) {
510 if (dflag > 1) {
511 syslog(LOG_DEBUG,
512 "<%s> prefix(%s/%d) was "
513 "deleted on %s, "
514 "but it was not in list",
515 __func__,
516 inet_ntop(AF_INET6, addr,
517 (char *)addrbuf, INET6_ADDRSTRLEN),
518 plen, rai->ifname);
519 }
520 break;
521 }
522 invalidate_prefix(prefix);
523 prefixchange = 1;
524 break;
525 case RTM_NEWADDR:
526 case RTM_DELADDR:
527 /* init ifflags because it may have changed */
528 iflist[ifindex]->ifm_flags =
529 if_getflags(ifindex, iflist[ifindex]->ifm_flags);
530 break;
531 case RTM_IFINFO:
532 iflist[ifindex]->ifm_flags = get_ifm_flags(next);
533 break;
534 default:
535 /* should not reach here */
536 if (dflag > 1) {
537 syslog(LOG_DEBUG,
538 "<%s:%d> unknown rtmsg %d on %s",
539 __func__, __LINE__, type,
540 if_indextoname(ifindex, ifname));
541 }
542 return;
543 }
544
545 /* check if an interface flag is changed */
546 if ((oldifflags & IFF_UP) && /* UP to DOWN */
547 !(iflist[ifindex]->ifm_flags & IFF_UP)) {
548 syslog(LOG_INFO,
549 "<%s> interface %s becomes down. stop timer.",
550 __func__, rai->ifname);
551 rtadvd_remove_timer(&rai->timer);
552 } else if (!(oldifflags & IFF_UP) && /* DOWN to UP */
553 (iflist[ifindex]->ifm_flags & IFF_UP)) {
554 syslog(LOG_INFO,
555 "<%s> interface %s becomes up. restart timer.",
556 __func__, rai->ifname);
557
558 rai->initcounter = 0; /* reset the counter */
559 rai->waiting = 0; /* XXX */
560 rai->timer = rtadvd_add_timer(ra_timeout,
561 ra_timer_update, rai, rai);
562 ra_timer_update((void *)rai, &rai->timer->tm);
563 rtadvd_set_timer(&rai->timer->tm, rai->timer);
564 } else if (prefixchange &&
565 (iflist[ifindex]->ifm_flags & IFF_UP)) {
566 /*
567 * An advertised prefix has been added or invalidated.
568 * Will notice the change in a short delay.
569 */
570 rai->initcounter = 0;
571 set_short_delay(rai);
572 }
573 }
574
575 return;
576 }
577
578 void
579 rtadvd_input()
580 {
581 int i;
582 int *hlimp = NULL;
583 #ifdef OLDRAWSOCKET
584 struct ip6_hdr *ip;
585 #endif
586 struct icmp6_hdr *icp;
587 int ifindex = 0;
588 struct cmsghdr *cm;
589 struct in6_pktinfo *pi = NULL;
590 char ntopbuf[INET6_ADDRSTRLEN], ifnamebuf[IFNAMSIZ];
591 struct in6_addr dst = in6addr_any;
592
593 /*
594 * Get message. We reset msg_controllen since the field could
595 * be modified if we had received a message before setting
596 * receive options.
597 */
598 rcvmhdr.msg_controllen = rcvcmsgbuflen;
599 if ((i = recvmsg(sock, &rcvmhdr, 0)) < 0)
600 return;
601
602 /* extract optional information via Advanced API */
603 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(&rcvmhdr);
604 cm;
605 cm = (struct cmsghdr *)CMSG_NXTHDR(&rcvmhdr, cm)) {
606 if (cm->cmsg_level == IPPROTO_IPV6 &&
607 cm->cmsg_type == IPV6_PKTINFO &&
608 cm->cmsg_len == CMSG_LEN(sizeof(struct in6_pktinfo))) {
609 pi = (struct in6_pktinfo *)(CMSG_DATA(cm));
610 ifindex = pi->ipi6_ifindex;
611 dst = pi->ipi6_addr;
612 }
613 if (cm->cmsg_level == IPPROTO_IPV6 &&
614 cm->cmsg_type == IPV6_HOPLIMIT &&
615 cm->cmsg_len == CMSG_LEN(sizeof(int)))
616 hlimp = (int *)CMSG_DATA(cm);
617 }
618 if (ifindex == 0) {
619 syslog(LOG_ERR,
620 "<%s> failed to get receiving interface",
621 __func__);
622 return;
623 }
624 if (hlimp == NULL) {
625 syslog(LOG_ERR,
626 "<%s> failed to get receiving hop limit",
627 __func__);
628 return;
629 }
630
631 /*
632 * If we happen to receive data on an interface which is now gone
633 * or down, just discard the data.
634 */
635 if (iflist[pi->ipi6_ifindex] == NULL ||
636 (iflist[pi->ipi6_ifindex]->ifm_flags & IFF_UP) == 0) {
637 syslog(LOG_INFO,
638 "<%s> received data on a disabled interface (%s)",
639 __func__,
640 (iflist[pi->ipi6_ifindex] == NULL) ? "[gone]" :
641 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
642 return;
643 }
644
645 #ifdef OLDRAWSOCKET
646 if (i < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr)) {
647 syslog(LOG_ERR,
648 "<%s> packet size(%d) is too short",
649 __func__, i);
650 return;
651 }
652
653 ip = (struct ip6_hdr *)rcvmhdr.msg_iov[0].iov_base;
654 icp = (struct icmp6_hdr *)(ip + 1); /* XXX: ext. hdr? */
655 #else
656 if (i < sizeof(struct icmp6_hdr)) {
657 syslog(LOG_ERR,
658 "<%s> packet size(%d) is too short",
659 __func__, i);
660 return;
661 }
662
663 icp = (struct icmp6_hdr *)rcvmhdr.msg_iov[0].iov_base;
664 #endif
665
666 switch (icp->icmp6_type) {
667 case ND_ROUTER_SOLICIT:
668 /*
669 * Message verification - RFC-2461 6.1.1
670 * XXX: these checks must be done in the kernel as well,
671 * but we can't completely rely on them.
672 */
673 if (*hlimp != 255) {
674 syslog(LOG_NOTICE,
675 "<%s> RS with invalid hop limit(%d) "
676 "received from %s on %s",
677 __func__, *hlimp,
678 inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf,
679 INET6_ADDRSTRLEN),
680 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
681 return;
682 }
683 if (icp->icmp6_code) {
684 syslog(LOG_NOTICE,
685 "<%s> RS with invalid ICMP6 code(%d) "
686 "received from %s on %s",
687 __func__, icp->icmp6_code,
688 inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf,
689 INET6_ADDRSTRLEN),
690 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
691 return;
692 }
693 if (i < sizeof(struct nd_router_solicit)) {
694 syslog(LOG_NOTICE,
695 "<%s> RS from %s on %s does not have enough "
696 "length (len = %d)",
697 __func__,
698 inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf,
699 INET6_ADDRSTRLEN),
700 if_indextoname(pi->ipi6_ifindex, ifnamebuf), i);
701 return;
702 }
703 rs_input(i, (struct nd_router_solicit *)icp, pi, &rcvfrom);
704 break;
705 case ND_ROUTER_ADVERT:
706 /*
707 * Message verification - RFC-2461 6.1.2
708 * XXX: there's a same dilemma as above...
709 */
710 if (*hlimp != 255) {
711 syslog(LOG_NOTICE,
712 "<%s> RA with invalid hop limit(%d) "
713 "received from %s on %s",
714 __func__, *hlimp,
715 inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf,
716 INET6_ADDRSTRLEN),
717 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
718 return;
719 }
720 if (icp->icmp6_code) {
721 syslog(LOG_NOTICE,
722 "<%s> RA with invalid ICMP6 code(%d) "
723 "received from %s on %s",
724 __func__, icp->icmp6_code,
725 inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf,
726 INET6_ADDRSTRLEN),
727 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
728 return;
729 }
730 if (i < sizeof(struct nd_router_advert)) {
731 syslog(LOG_NOTICE,
732 "<%s> RA from %s on %s does not have enough "
733 "length (len = %d)",
734 __func__,
735 inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf,
736 INET6_ADDRSTRLEN),
737 if_indextoname(pi->ipi6_ifindex, ifnamebuf), i);
738 return;
739 }
740 ra_input(i, (struct nd_router_advert *)icp, pi, &rcvfrom);
741 break;
742 case ICMP6_ROUTER_RENUMBERING:
743 if (accept_rr == 0) {
744 syslog(LOG_ERR, "<%s> received a router renumbering "
745 "message, but not allowed to be accepted",
746 __func__);
747 break;
748 }
749 rr_input(i, (struct icmp6_router_renum *)icp, pi, &rcvfrom,
750 &dst);
751 break;
752 default:
753 /*
754 * Note that this case is POSSIBLE, especially just
755 * after invocation of the daemon. This is because we
756 * could receive message after opening the socket and
757 * before setting ICMP6 type filter(see sock_open()).
758 */
759 syslog(LOG_ERR, "<%s> invalid icmp type(%d)",
760 __func__, icp->icmp6_type);
761 return;
762 }
763
764 return;
765 }
766
767 static void
768 rs_input(int len, struct nd_router_solicit *rs,
769 struct in6_pktinfo *pi, struct sockaddr_in6 *from)
770 {
771 char ntopbuf[INET6_ADDRSTRLEN], ifnamebuf[IFNAMSIZ];
772 union nd_opts ndopts;
773 struct rainfo *ra;
774 struct soliciter *sol;
775
776 syslog(LOG_DEBUG,
777 "<%s> RS received from %s on %s",
778 __func__,
779 inet_ntop(AF_INET6, &from->sin6_addr,
780 ntopbuf, INET6_ADDRSTRLEN),
781 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
782
783 /* ND option check */
784 memset(&ndopts, 0, sizeof(ndopts));
785 if (nd6_options((struct nd_opt_hdr *)(rs + 1),
786 len - sizeof(struct nd_router_solicit),
787 &ndopts, NDOPT_FLAG_SRCLINKADDR)) {
788 syslog(LOG_INFO,
789 "<%s> ND option check failed for an RS from %s on %s",
790 __func__,
791 inet_ntop(AF_INET6, &from->sin6_addr,
792 ntopbuf, INET6_ADDRSTRLEN),
793 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
794 return;
795 }
796
797 /*
798 * If the IP source address is the unspecified address, there
799 * must be no source link-layer address option in the message.
800 * (RFC-2461 6.1.1)
801 */
802 if (IN6_IS_ADDR_UNSPECIFIED(&from->sin6_addr) &&
803 ndopts.nd_opts_src_lladdr) {
804 syslog(LOG_INFO,
805 "<%s> RS from unspecified src on %s has a link-layer"
806 " address option",
807 __func__,
808 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
809 goto done;
810 }
811
812 ra = ralist;
813 while (ra != NULL) {
814 if (pi->ipi6_ifindex == ra->ifindex)
815 break;
816 ra = ra->next;
817 }
818 if (ra == NULL) {
819 syslog(LOG_INFO,
820 "<%s> RS received on non advertising interface(%s)",
821 __func__,
822 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
823 goto done;
824 }
825
826 ra->rsinput++; /* increment statistics */
827
828 /*
829 * Decide whether to send RA according to the rate-limit
830 * consideration.
831 */
832
833 /* record sockaddr waiting for RA, if possible */
834 sol = (struct soliciter *)malloc(sizeof(*sol));
835 if (sol) {
836 sol->addr = *from;
837 /* XXX RFC2553 need clarification on flowinfo */
838 sol->addr.sin6_flowinfo = 0;
839 sol->next = ra->soliciter;
840 ra->soliciter = sol;
841 }
842
843 /*
844 * If there is already a waiting RS packet, don't
845 * update the timer.
846 */
847 if (ra->waiting++)
848 goto done;
849
850 set_short_delay(ra);
851
852 done:
853 free_ndopts(&ndopts);
854 return;
855 }
856
857 static void
858 set_short_delay(rai)
859 struct rainfo *rai;
860 {
861 long delay; /* must not be greater than 1000000 */
862 struct timeval interval, now, min_delay, tm_tmp, *rest;
863
864 /*
865 * Compute a random delay. If the computed value
866 * corresponds to a time later than the time the next
867 * multicast RA is scheduled to be sent, ignore the random
868 * delay and send the advertisement at the
869 * already-scheduled time. RFC-2461 6.2.6
870 */
871 #ifdef HAVE_ARC4RANDOM
872 delay = arc4random_uniform(MAX_RA_DELAY_TIME);
873 #else
874 delay = random() % MAX_RA_DELAY_TIME;
875 #endif
876 interval.tv_sec = 0;
877 interval.tv_usec = delay;
878 rest = rtadvd_timer_rest(rai->timer);
879 if (TIMEVAL_LT(*rest, interval)) {
880 syslog(LOG_DEBUG, "<%s> random delay is larger than "
881 "the rest of the current timer", __func__);
882 interval = *rest;
883 }
884
885 /*
886 * If we sent a multicast Router Advertisement within
887 * the last MIN_DELAY_BETWEEN_RAS seconds, schedule
888 * the advertisement to be sent at a time corresponding to
889 * MIN_DELAY_BETWEEN_RAS plus the random value after the
890 * previous advertisement was sent.
891 */
892 gettimeofday(&now, NULL);
893 TIMEVAL_SUB(&now, &rai->lastsent, &tm_tmp);
894 min_delay.tv_sec = MIN_DELAY_BETWEEN_RAS;
895 min_delay.tv_usec = 0;
896 if (TIMEVAL_LT(tm_tmp, min_delay)) {
897 TIMEVAL_SUB(&min_delay, &tm_tmp, &min_delay);
898 TIMEVAL_ADD(&min_delay, &interval, &interval);
899 }
900 rtadvd_set_timer(&interval, rai->timer);
901 }
902
903 static void
904 ra_input(int len, struct nd_router_advert *ra,
905 struct in6_pktinfo *pi, struct sockaddr_in6 *from)
906 {
907 struct rainfo *rai;
908 char ntopbuf[INET6_ADDRSTRLEN], ifnamebuf[IFNAMSIZ];
909 union nd_opts ndopts;
910 char *on_off[] = {"OFF", "ON"};
911 u_int32_t reachabletime, retranstimer, mtu;
912 int inconsistent = 0;
913
914 syslog(LOG_DEBUG,
915 "<%s> RA received from %s on %s",
916 __func__,
917 inet_ntop(AF_INET6, &from->sin6_addr,
918 ntopbuf, INET6_ADDRSTRLEN),
919 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
920
921 /* ND option check */
922 memset(&ndopts, 0, sizeof(ndopts));
923 if (nd6_options((struct nd_opt_hdr *)(ra + 1),
924 len - sizeof(struct nd_router_advert),
925 &ndopts, NDOPT_FLAG_SRCLINKADDR |
926 NDOPT_FLAG_PREFIXINFO | NDOPT_FLAG_MTU)) {
927 syslog(LOG_INFO,
928 "<%s> ND option check failed for an RA from %s on %s",
929 __func__,
930 inet_ntop(AF_INET6, &from->sin6_addr,
931 ntopbuf, INET6_ADDRSTRLEN),
932 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
933 return;
934 }
935
936 /*
937 * RA consistency check according to RFC-2461 6.2.7
938 */
939 if ((rai = if_indextorainfo(pi->ipi6_ifindex)) == 0) {
940 syslog(LOG_INFO,
941 "<%s> received RA from %s on non-advertising"
942 " interface(%s)",
943 __func__,
944 inet_ntop(AF_INET6, &from->sin6_addr,
945 ntopbuf, INET6_ADDRSTRLEN),
946 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
947 goto done;
948 }
949 rai->rainput++; /* increment statistics */
950
951 /* Cur Hop Limit value */
952 if (ra->nd_ra_curhoplimit && rai->hoplimit &&
953 ra->nd_ra_curhoplimit != rai->hoplimit) {
954 syslog(LOG_INFO,
955 "<%s> CurHopLimit inconsistent on %s:"
956 " %d from %s, %d from us",
957 __func__,
958 rai->ifname,
959 ra->nd_ra_curhoplimit,
960 inet_ntop(AF_INET6, &from->sin6_addr,
961 ntopbuf, INET6_ADDRSTRLEN),
962 rai->hoplimit);
963 inconsistent++;
964 }
965 /* M flag */
966 if ((ra->nd_ra_flags_reserved & ND_RA_FLAG_MANAGED) !=
967 rai->managedflg) {
968 syslog(LOG_INFO,
969 "<%s> M flag inconsistent on %s:"
970 " %s from %s, %s from us",
971 __func__,
972 rai->ifname,
973 on_off[!rai->managedflg],
974 inet_ntop(AF_INET6, &from->sin6_addr,
975 ntopbuf, INET6_ADDRSTRLEN),
976 on_off[rai->managedflg]);
977 inconsistent++;
978 }
979 /* O flag */
980 if ((ra->nd_ra_flags_reserved & ND_RA_FLAG_OTHER) !=
981 rai->otherflg) {
982 syslog(LOG_INFO,
983 "<%s> O flag inconsistent on %s:"
984 " %s from %s, %s from us",
985 __func__,
986 rai->ifname,
987 on_off[!rai->otherflg],
988 inet_ntop(AF_INET6, &from->sin6_addr,
989 ntopbuf, INET6_ADDRSTRLEN),
990 on_off[rai->otherflg]);
991 inconsistent++;
992 }
993 /* Reachable Time */
994 reachabletime = ntohl(ra->nd_ra_reachable);
995 if (reachabletime && rai->reachabletime &&
996 reachabletime != rai->reachabletime) {
997 syslog(LOG_INFO,
998 "<%s> ReachableTime inconsistent on %s:"
999 " %d from %s, %d from us",
1000 __func__,
1001 rai->ifname,
1002 reachabletime,
1003 inet_ntop(AF_INET6, &from->sin6_addr,
1004 ntopbuf, INET6_ADDRSTRLEN),
1005 rai->reachabletime);
1006 inconsistent++;
1007 }
1008 /* Retrans Timer */
1009 retranstimer = ntohl(ra->nd_ra_retransmit);
1010 if (retranstimer && rai->retranstimer &&
1011 retranstimer != rai->retranstimer) {
1012 syslog(LOG_INFO,
1013 "<%s> RetranceTimer inconsistent on %s:"
1014 " %d from %s, %d from us",
1015 __func__,
1016 rai->ifname,
1017 retranstimer,
1018 inet_ntop(AF_INET6, &from->sin6_addr,
1019 ntopbuf, INET6_ADDRSTRLEN),
1020 rai->retranstimer);
1021 inconsistent++;
1022 }
1023 /* Values in the MTU options */
1024 if (ndopts.nd_opts_mtu) {
1025 mtu = ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu);
1026 if (mtu && rai->linkmtu && mtu != rai->linkmtu) {
1027 syslog(LOG_INFO,
1028 "<%s> MTU option value inconsistent on %s:"
1029 " %d from %s, %d from us",
1030 __func__,
1031 rai->ifname, mtu,
1032 inet_ntop(AF_INET6, &from->sin6_addr,
1033 ntopbuf, INET6_ADDRSTRLEN),
1034 rai->linkmtu);
1035 inconsistent++;
1036 }
1037 }
1038 /* Preferred and Valid Lifetimes for prefixes */
1039 {
1040 struct nd_optlist *optp = ndopts.nd_opts_list;
1041
1042 if (ndopts.nd_opts_pi) {
1043 if (prefix_check(ndopts.nd_opts_pi, rai, from))
1044 inconsistent++;
1045 }
1046 while (optp) {
1047 if (prefix_check((struct nd_opt_prefix_info *)optp->opt,
1048 rai, from))
1049 inconsistent++;
1050 optp = optp->next;
1051 }
1052 }
1053
1054 if (inconsistent)
1055 rai->rainconsistent++;
1056
1057 done:
1058 free_ndopts(&ndopts);
1059 return;
1060 }
1061
1062 /* return a non-zero value if the received prefix is inconsitent with ours */
1063 static int
1064 prefix_check(struct nd_opt_prefix_info *pinfo,
1065 struct rainfo *rai, struct sockaddr_in6 *from)
1066 {
1067 u_int32_t preferred_time, valid_time;
1068 struct prefix *pp;
1069 int inconsistent = 0;
1070 char ntopbuf[INET6_ADDRSTRLEN], prefixbuf[INET6_ADDRSTRLEN];
1071 struct timeval now;
1072
1073 #if 0 /* impossible */
1074 if (pinfo->nd_opt_pi_type != ND_OPT_PREFIX_INFORMATION)
1075 return(0);
1076 #endif
1077
1078 /*
1079 * log if the adveritsed prefix has link-local scope(sanity check?)
1080 */
1081 if (IN6_IS_ADDR_LINKLOCAL(&pinfo->nd_opt_pi_prefix)) {
1082 syslog(LOG_INFO,
1083 "<%s> link-local prefix %s/%d is advertised "
1084 "from %s on %s",
1085 __func__,
1086 inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix,
1087 prefixbuf, INET6_ADDRSTRLEN),
1088 pinfo->nd_opt_pi_prefix_len,
1089 inet_ntop(AF_INET6, &from->sin6_addr,
1090 ntopbuf, INET6_ADDRSTRLEN),
1091 rai->ifname);
1092 }
1093
1094 if ((pp = find_prefix(rai, &pinfo->nd_opt_pi_prefix,
1095 pinfo->nd_opt_pi_prefix_len)) == NULL) {
1096 syslog(LOG_INFO,
1097 "<%s> prefix %s/%d from %s on %s is not in our list",
1098 __func__,
1099 inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix,
1100 prefixbuf, INET6_ADDRSTRLEN),
1101 pinfo->nd_opt_pi_prefix_len,
1102 inet_ntop(AF_INET6, &from->sin6_addr,
1103 ntopbuf, INET6_ADDRSTRLEN),
1104 rai->ifname);
1105 return(0);
1106 }
1107
1108 preferred_time = ntohl(pinfo->nd_opt_pi_preferred_time);
1109 if (pp->pltimeexpire) {
1110 /*
1111 * The lifetime is decremented in real time, so we should
1112 * compare the expiration time.
1113 * (RFC 2461 Section 6.2.7.)
1114 * XXX: can we really expect that all routers on the link
1115 * have synchronized clocks?
1116 */
1117 gettimeofday(&now, NULL);
1118 preferred_time += now.tv_sec;
1119
1120 if (!pp->timer && rai->clockskew &&
1121 preferred_time - pp->pltimeexpire > rai->clockskew) {
1122 syslog(LOG_INFO,
1123 "<%s> preferred lifetime for %s/%d"
1124 " (decr. in real time) inconsistent on %s:"
1125 " %d from %s, %ld from us",
1126 __func__,
1127 inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix,
1128 prefixbuf, INET6_ADDRSTRLEN),
1129 pinfo->nd_opt_pi_prefix_len,
1130 rai->ifname, preferred_time,
1131 inet_ntop(AF_INET6, &from->sin6_addr,
1132 ntopbuf, INET6_ADDRSTRLEN),
1133 pp->pltimeexpire);
1134 inconsistent++;
1135 }
1136 } else if (!pp->timer && preferred_time != pp->preflifetime) {
1137 syslog(LOG_INFO,
1138 "<%s> preferred lifetime for %s/%d"
1139 " inconsistent on %s:"
1140 " %d from %s, %d from us",
1141 __func__,
1142 inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix,
1143 prefixbuf, INET6_ADDRSTRLEN),
1144 pinfo->nd_opt_pi_prefix_len,
1145 rai->ifname, preferred_time,
1146 inet_ntop(AF_INET6, &from->sin6_addr,
1147 ntopbuf, INET6_ADDRSTRLEN),
1148 pp->preflifetime);
1149 }
1150
1151 valid_time = ntohl(pinfo->nd_opt_pi_valid_time);
1152 if (pp->vltimeexpire) {
1153 gettimeofday(&now, NULL);
1154 valid_time += now.tv_sec;
1155
1156 if (!pp->timer && rai->clockskew &&
1157 valid_time - pp->vltimeexpire > rai->clockskew) {
1158 syslog(LOG_INFO,
1159 "<%s> valid lifetime for %s/%d"
1160 " (decr. in real time) inconsistent on %s:"
1161 " %d from %s, %ld from us",
1162 __func__,
1163 inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix,
1164 prefixbuf, INET6_ADDRSTRLEN),
1165 pinfo->nd_opt_pi_prefix_len,
1166 rai->ifname, preferred_time,
1167 inet_ntop(AF_INET6, &from->sin6_addr,
1168 ntopbuf, INET6_ADDRSTRLEN),
1169 pp->vltimeexpire);
1170 inconsistent++;
1171 }
1172 } else if (!pp->timer && valid_time != pp->validlifetime) {
1173 syslog(LOG_INFO,
1174 "<%s> valid lifetime for %s/%d"
1175 " inconsistent on %s:"
1176 " %d from %s, %d from us",
1177 __func__,
1178 inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix,
1179 prefixbuf, INET6_ADDRSTRLEN),
1180 pinfo->nd_opt_pi_prefix_len,
1181 rai->ifname, valid_time,
1182 inet_ntop(AF_INET6, &from->sin6_addr,
1183 ntopbuf, INET6_ADDRSTRLEN),
1184 pp->validlifetime);
1185 inconsistent++;
1186 }
1187
1188 return(inconsistent);
1189 }
1190
1191 struct prefix *
1192 find_prefix(struct rainfo *rai, struct in6_addr *prefix, int plen)
1193 {
1194 struct prefix *pp;
1195 int bytelen, bitlen;
1196 u_char bitmask;
1197
1198 for (pp = rai->prefix.next; pp != &rai->prefix; pp = pp->next) {
1199 if (plen != pp->prefixlen)
1200 continue;
1201 bytelen = plen / 8;
1202 bitlen = plen % 8;
1203 bitmask = 0xff << (8 - bitlen);
1204 if (memcmp((void *)prefix, (void *)&pp->prefix, bytelen))
1205 continue;
1206 if (bitlen == 0 ||
1207 ((prefix->s6_addr[bytelen] & bitmask) ==
1208 (pp->prefix.s6_addr[bytelen] & bitmask))) {
1209 return(pp);
1210 }
1211 }
1212
1213 return(NULL);
1214 }
1215
1216 /* check if p0/plen0 matches p1/plen1; return 1 if matches, otherwise 0. */
1217 int
1218 prefix_match(struct in6_addr *p0, int plen0,
1219 struct in6_addr *p1, int plen1)
1220 {
1221 int bytelen, bitlen;
1222 u_char bitmask;
1223
1224 if (plen0 < plen1)
1225 return(0);
1226 bytelen = plen1 / 8;
1227 bitlen = plen1 % 8;
1228 bitmask = 0xff << (8 - bitlen);
1229 if (memcmp((void *)p0, (void *)p1, bytelen))
1230 return(0);
1231 if (bitlen == 0 ||
1232 ((p0->s6_addr[bytelen] & bitmask) ==
1233 (p1->s6_addr[bytelen] & bitmask))) {
1234 return(1);
1235 }
1236
1237 return(0);
1238 }
1239
1240 static int
1241 nd6_options(struct nd_opt_hdr *hdr, int limit,
1242 union nd_opts *ndopts, u_int32_t optflags)
1243 {
1244 int optlen = 0;
1245
1246 for (; limit > 0; limit -= optlen) {
1247 if (limit < sizeof(struct nd_opt_hdr)) {
1248 syslog(LOG_INFO, "<%s> short option header", __func__);
1249 goto bad;
1250 }
1251
1252 hdr = (struct nd_opt_hdr *)((caddr_t)hdr + optlen);
1253 if (hdr->nd_opt_len == 0) {
1254 syslog(LOG_INFO,
1255 "<%s> bad ND option length(0) (type = %d)",
1256 __func__, hdr->nd_opt_type);
1257 goto bad;
1258 }
1259 optlen = hdr->nd_opt_len << 3;
1260 if (optlen > limit) {
1261 syslog(LOG_INFO, "<%s> short option", __func__);
1262 goto bad;
1263 }
1264
1265 if (hdr->nd_opt_type > ND_OPT_MTU) {
1266 syslog(LOG_INFO, "<%s> unknown ND option(type %d)",
1267 __func__, hdr->nd_opt_type);
1268 continue;
1269 }
1270
1271 if ((ndopt_flags[hdr->nd_opt_type] & optflags) == 0) {
1272 syslog(LOG_INFO, "<%s> unexpected ND option(type %d)",
1273 __func__, hdr->nd_opt_type);
1274 continue;
1275 }
1276
1277 /*
1278 * Option length check. Do it here for all fixed-length
1279 * options.
1280 */
1281 if ((hdr->nd_opt_type == ND_OPT_MTU &&
1282 (optlen != sizeof(struct nd_opt_mtu))) ||
1283 ((hdr->nd_opt_type == ND_OPT_PREFIX_INFORMATION &&
1284 optlen != sizeof(struct nd_opt_prefix_info)))) {
1285 syslog(LOG_INFO, "<%s> invalid option length",
1286 __func__);
1287 continue;
1288 }
1289
1290 switch (hdr->nd_opt_type) {
1291 case ND_OPT_TARGET_LINKADDR:
1292 case ND_OPT_REDIRECTED_HEADER:
1293 break; /* we don't care about these options */
1294 case ND_OPT_SOURCE_LINKADDR:
1295 case ND_OPT_MTU:
1296 if (ndopts->nd_opt_array[hdr->nd_opt_type]) {
1297 syslog(LOG_INFO,
1298 "<%s> duplicated ND option (type = %d)",
1299 __func__, hdr->nd_opt_type);
1300 }
1301 ndopts->nd_opt_array[hdr->nd_opt_type] = hdr;
1302 break;
1303 case ND_OPT_PREFIX_INFORMATION:
1304 {
1305 struct nd_optlist *pfxlist;
1306
1307 if (ndopts->nd_opts_pi == 0) {
1308 ndopts->nd_opts_pi =
1309 (struct nd_opt_prefix_info *)hdr;
1310 continue;
1311 }
1312 if ((pfxlist = malloc(sizeof(*pfxlist))) == NULL) {
1313 syslog(LOG_ERR, "<%s> can't allocate memory",
1314 __func__);
1315 goto bad;
1316 }
1317 pfxlist->next = ndopts->nd_opts_list;
1318 pfxlist->opt = hdr;
1319 ndopts->nd_opts_list = pfxlist;
1320
1321 break;
1322 }
1323 default: /* impossible */
1324 break;
1325 }
1326 }
1327
1328 return(0);
1329
1330 bad:
1331 free_ndopts(ndopts);
1332
1333 return(-1);
1334 }
1335
1336 static void
1337 free_ndopts(union nd_opts *ndopts)
1338 {
1339 struct nd_optlist *opt = ndopts->nd_opts_list, *next;
1340
1341 while (opt) {
1342 next = opt->next;
1343 free(opt);
1344 opt = next;
1345 }
1346 }
1347
1348 void
1349 sock_open()
1350 {
1351 struct icmp6_filter filt;
1352 struct ipv6_mreq mreq;
1353 struct rainfo *ra = ralist;
1354 int on;
1355 /* XXX: should be max MTU attached to the node */
1356 static u_char answer[1500];
1357
1358 rcvcmsgbuflen = CMSG_SPACE(sizeof(struct in6_pktinfo)) +
1359 CMSG_SPACE(sizeof(int));
1360 rcvcmsgbuf = (u_char *)malloc(rcvcmsgbuflen);
1361 if (rcvcmsgbuf == NULL) {
1362 syslog(LOG_ERR, "<%s> not enough core", __func__);
1363 exit(1);
1364 }
1365
1366 sndcmsgbuflen = CMSG_SPACE(sizeof(struct in6_pktinfo)) +
1367 CMSG_SPACE(sizeof(int));
1368 sndcmsgbuf = (u_char *)malloc(sndcmsgbuflen);
1369 if (sndcmsgbuf == NULL) {
1370 syslog(LOG_ERR, "<%s> not enough core", __func__);
1371 exit(1);
1372 }
1373
1374 if ((sock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0) {
1375 syslog(LOG_ERR, "<%s> socket: %s", __func__,
1376 strerror(errno));
1377 exit(1);
1378 }
1379
1380 (void) setsockopt(sock, SOL_SOCKET, SO_TRAFFIC_CLASS,
1381 (void *)&so_traffic_class, sizeof (so_traffic_class));
1382
1383 /* specify to tell receiving interface */
1384 on = 1;
1385 #ifdef IPV6_RECVPKTINFO
1386 if (setsockopt(sock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &on,
1387 sizeof(on)) < 0) {
1388 syslog(LOG_ERR, "<%s> IPV6_RECVPKTINFO: %s",
1389 __func__, strerror(errno));
1390 exit(1);
1391 }
1392 #else /* old adv. API */
1393 if (setsockopt(sock, IPPROTO_IPV6, IPV6_PKTINFO, &on,
1394 sizeof(on)) < 0) {
1395 syslog(LOG_ERR, "<%s> IPV6_PKTINFO: %s",
1396 __func__, strerror(errno));
1397 exit(1);
1398 }
1399 #endif
1400
1401 on = 1;
1402 /* specify to tell value of hoplimit field of received IP6 hdr */
1403 #ifdef IPV6_RECVHOPLIMIT
1404 if (setsockopt(sock, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &on,
1405 sizeof(on)) < 0) {
1406 syslog(LOG_ERR, "<%s> IPV6_RECVHOPLIMIT: %s",
1407 __func__, strerror(errno));
1408 exit(1);
1409 }
1410 #else /* old adv. API */
1411 if (setsockopt(sock, IPPROTO_IPV6, IPV6_HOPLIMIT, &on,
1412 sizeof(on)) < 0) {
1413 syslog(LOG_ERR, "<%s> IPV6_HOPLIMIT: %s",
1414 __func__, strerror(errno));
1415 exit(1);
1416 }
1417 #endif
1418
1419 ICMP6_FILTER_SETBLOCKALL(&filt);
1420 ICMP6_FILTER_SETPASS(ND_ROUTER_SOLICIT, &filt);
1421 ICMP6_FILTER_SETPASS(ND_ROUTER_ADVERT, &filt);
1422 if (accept_rr)
1423 ICMP6_FILTER_SETPASS(ICMP6_ROUTER_RENUMBERING, &filt);
1424 if (setsockopt(sock, IPPROTO_ICMPV6, ICMP6_FILTER, &filt,
1425 sizeof(filt)) < 0) {
1426 syslog(LOG_ERR, "<%s> IICMP6_FILTER: %s",
1427 __func__, strerror(errno));
1428 exit(1);
1429 }
1430
1431 /*
1432 * join all routers multicast address on each advertising interface.
1433 */
1434 if (inet_pton(AF_INET6, ALLROUTERS_LINK,
1435 &mreq.ipv6mr_multiaddr.s6_addr)
1436 != 1) {
1437 syslog(LOG_ERR, "<%s> inet_pton failed(library bug?)",
1438 __func__);
1439 exit(1);
1440 }
1441 while (ra) {
1442 mreq.ipv6mr_interface = ra->ifindex;
1443 if (setsockopt(sock, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq,
1444 sizeof(mreq)) < 0) {
1445 syslog(LOG_ERR, "<%s> IPV6_JOIN_GROUP(link) on %s: %s",
1446 __func__, ra->ifname, strerror(errno));
1447 exit(1);
1448 }
1449 ra = ra->next;
1450 }
1451
1452 /*
1453 * When attending router renumbering, join all-routers site-local
1454 * multicast group.
1455 */
1456 if (accept_rr) {
1457 if (inet_pton(AF_INET6, ALLROUTERS_SITE,
1458 &in6a_site_allrouters) != 1) {
1459 syslog(LOG_ERR, "<%s> inet_pton failed(library bug?)",
1460 __func__);
1461 exit(1);
1462 }
1463 mreq.ipv6mr_multiaddr = in6a_site_allrouters;
1464 if (mcastif) {
1465 if ((mreq.ipv6mr_interface = if_nametoindex(mcastif))
1466 == 0) {
1467 syslog(LOG_ERR,
1468 "<%s> invalid interface: %s",
1469 __func__, mcastif);
1470 exit(1);
1471 }
1472 } else
1473 mreq.ipv6mr_interface = ralist->ifindex;
1474 if (setsockopt(sock, IPPROTO_IPV6, IPV6_JOIN_GROUP,
1475 &mreq, sizeof(mreq)) < 0) {
1476 syslog(LOG_ERR,
1477 "<%s> IPV6_JOIN_GROUP(site) on %s: %s",
1478 __func__,
1479 mcastif ? mcastif : ralist->ifname,
1480 strerror(errno));
1481 exit(1);
1482 }
1483 }
1484
1485 /* initialize msghdr for receiving packets */
1486 rcviov[0].iov_base = (caddr_t)answer;
1487 rcviov[0].iov_len = sizeof(answer);
1488 rcvmhdr.msg_name = (caddr_t)&rcvfrom;
1489 rcvmhdr.msg_namelen = sizeof(rcvfrom);
1490 rcvmhdr.msg_iov = rcviov;
1491 rcvmhdr.msg_iovlen = 1;
1492 rcvmhdr.msg_control = (caddr_t) rcvcmsgbuf;
1493 rcvmhdr.msg_controllen = rcvcmsgbuflen;
1494
1495 /* initialize msghdr for sending packets */
1496 sndmhdr.msg_namelen = sizeof(struct sockaddr_in6);
1497 sndmhdr.msg_iov = sndiov;
1498 sndmhdr.msg_iovlen = 1;
1499 sndmhdr.msg_control = (caddr_t)sndcmsgbuf;
1500 sndmhdr.msg_controllen = sndcmsgbuflen;
1501
1502 return;
1503 }
1504
1505 /* open a routing socket to watch the routing table */
1506 static void
1507 rtsock_open()
1508 {
1509 if ((rtsock = socket(PF_ROUTE, SOCK_RAW, 0)) < 0) {
1510 syslog(LOG_ERR,
1511 "<%s> socket: %s", __func__, strerror(errno));
1512 exit(1);
1513 }
1514 }
1515
1516 struct rainfo *
1517 if_indextorainfo(int idx)
1518 {
1519 struct rainfo *rai = ralist;
1520
1521 for (rai = ralist; rai; rai = rai->next) {
1522 if (rai->ifindex == idx)
1523 return(rai);
1524 }
1525
1526 return(NULL); /* search failed */
1527 }
1528
1529 static void
1530 ra_output(rainfo)
1531 struct rainfo *rainfo;
1532 {
1533 int i;
1534 struct cmsghdr *cm;
1535 struct in6_pktinfo *pi;
1536 struct soliciter *sol, *nextsol;
1537
1538 if ((iflist[rainfo->ifindex]->ifm_flags & IFF_UP) == 0) {
1539 syslog(LOG_DEBUG, "<%s> %s is not up, skip sending RA",
1540 __func__, rainfo->ifname);
1541 return;
1542 }
1543
1544 make_packet(rainfo); /* XXX: inefficient */
1545
1546 sndmhdr.msg_name = (caddr_t)&sin6_allnodes;
1547 sndmhdr.msg_iov[0].iov_base = (caddr_t)rainfo->ra_data;
1548 sndmhdr.msg_iov[0].iov_len = rainfo->ra_datalen;
1549
1550 cm = CMSG_FIRSTHDR(&sndmhdr);
1551 /* specify the outgoing interface */
1552 cm->cmsg_level = IPPROTO_IPV6;
1553 cm->cmsg_type = IPV6_PKTINFO;
1554 cm->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
1555 pi = (struct in6_pktinfo *)CMSG_DATA(cm);
1556 memset(&pi->ipi6_addr, 0, sizeof(pi->ipi6_addr)); /*XXX*/
1557 pi->ipi6_ifindex = rainfo->ifindex;
1558
1559 /* specify the hop limit of the packet */
1560 {
1561 int hoplimit = 255;
1562
1563 cm = CMSG_NXTHDR(&sndmhdr, cm);
1564 cm->cmsg_level = IPPROTO_IPV6;
1565 cm->cmsg_type = IPV6_HOPLIMIT;
1566 cm->cmsg_len = CMSG_LEN(sizeof(int));
1567 memcpy(CMSG_DATA(cm), &hoplimit, sizeof(int));
1568 }
1569
1570 syslog(LOG_DEBUG,
1571 "<%s> send RA on %s, # of waitings = %d",
1572 __func__, rainfo->ifname, rainfo->waiting);
1573
1574 i = sendmsg(sock, &sndmhdr, 0);
1575
1576 if (i < 0 || i != rainfo->ra_datalen) {
1577 if (i < 0) {
1578 syslog(LOG_ERR, "<%s> sendmsg on %s: %s",
1579 __func__, rainfo->ifname,
1580 strerror(errno));
1581 }
1582 }
1583 /* update counter */
1584 if (rainfo->initcounter < MAX_INITIAL_RTR_ADVERTISEMENTS)
1585 rainfo->initcounter++;
1586 rainfo->raoutput++;
1587
1588 /*
1589 * unicast advertisements
1590 * XXX commented out. reason: though spec does not forbit it, unicast
1591 * advert does not really help
1592 */
1593 for (sol = rainfo->soliciter; sol; sol = nextsol) {
1594 nextsol = sol->next;
1595
1596 sol->next = NULL;
1597 free(sol);
1598 }
1599 rainfo->soliciter = NULL;
1600
1601 /* update timestamp */
1602 gettimeofday(&rainfo->lastsent, NULL);
1603
1604 /* reset waiting conter */
1605 rainfo->waiting = 0;
1606 }
1607
1608 /* process RA timer */
1609 struct rtadvd_timer *
1610 ra_timeout(void *data)
1611 {
1612 struct rainfo *rai = (struct rainfo *)data;
1613
1614 #ifdef notyet
1615 /* if necessary, reconstruct the packet. */
1616 #endif
1617
1618 syslog(LOG_DEBUG,
1619 "<%s> RA timer on %s is expired",
1620 __func__, rai->ifname);
1621
1622 ra_output(rai);
1623
1624 return(rai->timer);
1625 }
1626
1627 /* update RA timer */
1628 void
1629 ra_timer_update(void *data, struct timeval *tm)
1630 {
1631 struct rainfo *rai = (struct rainfo *)data;
1632 long interval;
1633
1634 /*
1635 * Whenever a multicast advertisement is sent from an interface,
1636 * the timer is reset to a uniformly-distributed random value
1637 * between the interface's configured MinRtrAdvInterval and
1638 * MaxRtrAdvInterval (RFC2461 6.2.4).
1639 */
1640 interval = rai->mininterval;
1641 interval += random() % (rai->maxinterval - rai->mininterval);
1642
1643 /*
1644 * The first advertisement is sent as soon as rtadvd starts up
1645 * and for the next few advertisements (up to
1646 * MAX_INITIAL_RTR_ADVERTISEMENTS), if the randomly chosen interval
1647 * is greater than MAX_INITIAL_RTR_ADVERT_INTERVAL, the timer
1648 * SHOULD be set to MAX_INITIAL_RTR_ADVERT_INTERVAL instead.
1649 * (RFC-2461 6.2.4)
1650 */
1651 if (rai->initcounter < MAX_INITIAL_RTR_ADVERTISEMENTS &&
1652 interval > MAX_INITIAL_RTR_ADVERT_INTERVAL)
1653 interval = MAX_INITIAL_RTR_ADVERT_INTERVAL;
1654
1655 tm->tv_sec = rai->initcounter == 0 ? 0 : interval;
1656 tm->tv_usec = 0;
1657
1658 syslog(LOG_DEBUG,
1659 "<%s> RA timer on %s is set to %ld:%ld",
1660 __func__, rai->ifname,
1661 (long int)tm->tv_sec, (long int)tm->tv_usec);
1662
1663 return;
1664 }
mirror of network_cmds