Annotation of src/usr.sbin/rtadvd/rtadvd.c, Revision 1.53
1.53 ! roy 1: /* $NetBSD: rtadvd.c,v 1.52 2016/12/16 09:09:38 ozaki-r Exp $ */
1.30 rpaulo 2: /* $KAME: rtadvd.c,v 1.92 2005/10/17 14:40:02 suz Exp $ */
1.2 itojun 3:
1.1 itojun 4: /*
5: * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
6: * All rights reserved.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
16: * 3. Neither the name of the project nor the names of its contributors
17: * may be used to endorse or promote products derived from this software
18: * without specific prior written permission.
19: *
20: * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23: * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30: * SUCH DAMAGE.
31: */
32:
33: #include <sys/param.h>
34: #include <sys/socket.h>
35: #include <sys/uio.h>
36: #include <sys/time.h>
1.11 itojun 37: #include <sys/queue.h>
1.1 itojun 38:
39: #include <net/if.h>
40: #include <net/route.h>
41: #include <net/if_dl.h>
42: #include <netinet/in.h>
43: #include <netinet/ip6.h>
44: #include <netinet6/ip6_var.h>
45: #include <netinet/icmp6.h>
46:
47: #include <arpa/inet.h>
48:
49: #include <time.h>
50: #include <unistd.h>
51: #include <stdio.h>
52: #include <err.h>
53: #include <errno.h>
54: #include <string.h>
55: #include <stdlib.h>
56: #include <syslog.h>
1.39 roy 57: #ifdef __NetBSD__
1.17 itojun 58: #include <util.h>
1.39 roy 59: #endif
1.25 itojun 60: #include <poll.h>
1.44 roy 61: #include <pwd.h>
1.17 itojun 62:
1.1 itojun 63: #include "rtadvd.h"
64: #include "rrenum.h"
65: #include "advcap.h"
66: #include "timer.h"
67: #include "if.h"
68: #include "config.h"
1.9 itojun 69: #include "dump.h"
1.51 ozaki-r 70: #include "prog_ops.h"
1.1 itojun 71:
72: struct msghdr rcvmhdr;
1.36 roy 73: static unsigned char *rcvcmsgbuf;
1.6 itojun 74: static size_t rcvcmsgbuflen;
1.39 roy 75: static unsigned char *sndcmsgbuf;
1.6 itojun 76: static size_t sndcmsgbuflen;
1.18 itojun 77: volatile sig_atomic_t do_dump;
1.39 roy 78: volatile sig_atomic_t do_reconf;
1.18 itojun 79: volatile sig_atomic_t do_die;
1.1 itojun 80: struct msghdr sndmhdr;
81: struct iovec rcviov[2];
82: struct iovec sndiov[2];
1.30 rpaulo 83: struct sockaddr_in6 rcvfrom;
1.36 roy 84: static const char *dumpfilename = "/var/run/rtadvd.dump"; /* XXX configurable */
1.11 itojun 85: static char *mcastif;
1.12 itojun 86: int sock;
87: int rtsock = -1;
1.5 itojun 88: int accept_rr = 0;
1.1 itojun 89: int dflag = 0, sflag = 0;
90:
1.39 roy 91: static char **if_argv;
92: static int if_argc;
93:
1.31 mrg 94: char *conffile = NULL;
1.1 itojun 95:
1.36 roy 96: struct ralist_head_t ralist = TAILQ_HEAD_INITIALIZER(ralist);
97:
1.1 itojun 98: struct nd_optlist {
1.36 roy 99: TAILQ_ENTRY(nd_optlist) next;
1.1 itojun 100: struct nd_opt_hdr *opt;
101: };
102: union nd_opts {
1.18 itojun 103: struct nd_opt_hdr *nd_opt_array[9];
1.1 itojun 104: struct {
105: struct nd_opt_hdr *zero;
106: struct nd_opt_hdr *src_lladdr;
107: struct nd_opt_hdr *tgt_lladdr;
108: struct nd_opt_prefix_info *pi;
109: struct nd_opt_rd_hdr *rh;
110: struct nd_opt_mtu *mtu;
1.36 roy 111: TAILQ_HEAD(, nd_optlist) list;
1.1 itojun 112: } nd_opt_each;
113: };
114: #define nd_opts_src_lladdr nd_opt_each.src_lladdr
115: #define nd_opts_tgt_lladdr nd_opt_each.tgt_lladdr
116: #define nd_opts_pi nd_opt_each.pi
117: #define nd_opts_rh nd_opt_each.rh
118: #define nd_opts_mtu nd_opt_each.mtu
119: #define nd_opts_list nd_opt_each.list
120:
1.36 roy 121: #define NDOPT_FLAG_SRCLINKADDR (1 << 0)
122: #define NDOPT_FLAG_TGTLINKADDR (1 << 1)
123: #define NDOPT_FLAG_PREFIXINFO (1 << 2)
124: #define NDOPT_FLAG_RDHDR (1 << 3)
125: #define NDOPT_FLAG_MTU (1 << 4)
126: #define NDOPT_FLAG_RDNSS (1 << 5)
127: #define NDOPT_FLAG_DNSSL (1 << 6)
128:
129: uint32_t ndopt_flags[] = {
130: [ND_OPT_SOURCE_LINKADDR] = NDOPT_FLAG_SRCLINKADDR,
131: [ND_OPT_TARGET_LINKADDR] = NDOPT_FLAG_TGTLINKADDR,
132: [ND_OPT_PREFIX_INFORMATION] = NDOPT_FLAG_PREFIXINFO,
133: [ND_OPT_REDIRECTED_HEADER] = NDOPT_FLAG_RDHDR,
134: [ND_OPT_MTU] = NDOPT_FLAG_MTU,
135: [ND_OPT_RDNSS] = NDOPT_FLAG_RDNSS,
136: [ND_OPT_DNSSL] = NDOPT_FLAG_DNSSL,
137: };
138:
139: struct sockaddr_in6 sin6_linklocal_allnodes = {
140: .sin6_len = sizeof(sin6_linklocal_allnodes),
141: .sin6_family = AF_INET6,
142: .sin6_addr = IN6ADDR_LINKLOCAL_ALLNODES_INIT,
143: };
1.38 christos 144: #ifdef notdef
1.36 roy 145: struct sockaddr_in6 sin6_linklocal_allrouters = {
146: .sin6_len = sizeof(sin6_linklocal_allrouters),
147: .sin6_family = AF_INET6,
148: .sin6_addr = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT,
149: };
1.38 christos 150: #endif
1.36 roy 151: struct sockaddr_in6 sin6_sitelocal_allrouters = {
152: .sin6_len = sizeof(sin6_sitelocal_allrouters),
153: .sin6_family = AF_INET6,
154: .sin6_addr = IN6ADDR_SITELOCAL_ALLROUTERS_INIT,
1.1 itojun 155: };
156:
1.36 roy 157: static void set_die(int);
1.41 roy 158: static void die(void);
1.39 roy 159: static void set_reconf(int);
1.36 roy 160: static void sock_open(void);
161: static void rtsock_open(void);
162: static void rtadvd_input(void);
163: static void rs_input(int, struct nd_router_solicit *,
164: struct in6_pktinfo *, struct sockaddr_in6 *);
165: static void ra_input(int, struct nd_router_advert *,
166: struct in6_pktinfo *, struct sockaddr_in6 *);
1.39 roy 167: static struct rainfo *ra_output(struct rainfo *);
1.36 roy 168: static int prefix_check(struct nd_opt_prefix_info *, struct rainfo *,
169: struct sockaddr_in6 *);
170: static int nd6_options(struct nd_opt_hdr *, int, union nd_opts *, uint32_t);
171: static void free_ndopts(union nd_opts *);
172: static void rtmsg_input(void);
173: static void rtadvd_set_dump_file(int);
1.1 itojun 174:
175: int
1.36 roy 176: main(int argc, char *argv[])
1.1 itojun 177: {
1.23 mycroft 178: struct pollfd set[2];
1.47 roy 179: struct timespec *timeout;
1.1 itojun 180: int i, ch;
1.14 itojun 181: int fflag = 0, logopt;
1.44 roy 182: struct passwd *pw;
1.52 ozaki-r 183: const char *pidfilepath = NULL;
1.1 itojun 184:
185: /* get command line options and arguments */
1.52 ozaki-r 186: #define OPTIONS "c:dDfM:p:Rs"
1.7 itojun 187: while ((ch = getopt(argc, argv, OPTIONS)) != -1) {
188: #undef OPTIONS
1.14 itojun 189: switch (ch) {
190: case 'c':
191: conffile = optarg;
192: break;
193: case 'd':
194: dflag = 1;
195: break;
196: case 'D':
197: dflag = 2;
198: break;
199: case 'f':
200: fflag = 1;
201: break;
1.11 itojun 202: case 'M':
203: mcastif = optarg;
204: break;
1.52 ozaki-r 205: case 'p':
206: pidfilepath = optarg;
207: break;
1.14 itojun 208: case 'R':
209: fprintf(stderr, "rtadvd: "
210: "the -R option is currently ignored.\n");
211: /* accept_rr = 1; */
212: /* run anyway... */
213: break;
214: case 's':
215: sflag = 1;
216: break;
1.1 itojun 217: }
218: }
219: argc -= optind;
220: argv += optind;
221: if (argc == 0) {
222: fprintf(stderr,
1.39 roy 223: "usage: rtadvd [-DdfRs] [-c conffile]"
1.52 ozaki-r 224: " [-M ifname] [-p pidfile] interface ...\n");
1.1 itojun 225: exit(1);
226: }
227:
1.51 ozaki-r 228: if (prog_init && prog_init() == -1) {
229: err(1, "init failed");
230: }
231:
1.14 itojun 232: logopt = LOG_NDELAY | LOG_PID;
233: if (fflag)
234: logopt |= LOG_PERROR;
235: openlog("rtadvd", logopt, LOG_DAEMON);
236:
1.1 itojun 237: /* set log level */
238: if (dflag == 0)
239: (void)setlogmask(LOG_UPTO(LOG_ERR));
240: if (dflag == 1)
241: (void)setlogmask(LOG_UPTO(LOG_INFO));
242:
1.44 roy 243: errno = 0; /* Ensure errno is 0 so we know if getpwnam errors or not */
244: if ((pw = getpwnam(RTADVD_USER)) == NULL) {
245: if (errno == 0)
246: syslog(LOG_ERR,
247: "user %s does not exist, aborting",
248: RTADVD_USER);
249: else
250: syslog(LOG_ERR, "getpwnam: %s: %m", RTADVD_USER);
251: exit(1);
252: }
253:
1.1 itojun 254: /* timer initialization */
255: rtadvd_timer_init();
256:
1.39 roy 257: if_argc = argc;
258: if_argv = argv;
1.1 itojun 259: while (argc--)
1.39 roy 260: getconfig(*argv++, 1);
1.1 itojun 261:
262: if (!fflag)
1.51 ozaki-r 263: prog_daemon(1, 0);
1.13 itojun 264:
265: sock_open();
1.1 itojun 266:
1.39 roy 267: #ifdef __NetBSD__
1.9 itojun 268: /* record the current PID */
1.52 ozaki-r 269: if (pidfile(pidfilepath) < 0) {
1.18 itojun 270: syslog(LOG_ERR,
271: "<%s> failed to open the pid log file, run anyway.",
1.21 itojun 272: __func__);
1.18 itojun 273: }
1.39 roy 274: #endif
1.9 itojun 275:
1.23 mycroft 276: set[0].fd = sock;
277: set[0].events = POLLIN;
1.12 itojun 278: if (sflag == 0) {
279: rtsock_open();
1.23 mycroft 280: set[1].fd = rtsock;
281: set[1].events = POLLIN;
1.12 itojun 282: } else
1.24 mycroft 283: set[1].fd = -1;
1.19 itojun 284:
1.44 roy 285: syslog(LOG_INFO, "dropping privileges to %s", RTADVD_USER);
1.51 ozaki-r 286: if (prog_chroot(pw->pw_dir) == -1) {
1.44 roy 287: syslog(LOG_ERR, "chroot: %s: %m", pw->pw_dir);
288: exit(1);
289: }
1.51 ozaki-r 290: if (prog_chdir("/") == -1) {
1.44 roy 291: syslog(LOG_ERR, "chdir: /: %m");
292: exit(1);
293: }
1.51 ozaki-r 294: if (prog_setgroups(1, &pw->pw_gid) == -1 ||
295: prog_setgid(pw->pw_gid) == -1 ||
296: prog_setuid(pw->pw_uid) == -1)
1.44 roy 297: {
298: syslog(LOG_ERR, "failed to drop privileges: %m");
299: exit(1);
300: }
301:
1.41 roy 302: signal(SIGINT, set_die);
1.22 itojun 303: signal(SIGTERM, set_die);
1.39 roy 304: signal(SIGHUP, set_reconf);
1.22 itojun 305: signal(SIGUSR1, rtadvd_set_dump_file);
1.5 itojun 306:
1.23 mycroft 307: for (;;) {
1.9 itojun 308: if (do_dump) { /* SIGUSR1 */
309: do_dump = 0;
310: rtadvd_dump_file(dumpfilename);
311: }
312:
1.39 roy 313: if (do_reconf) { /* SIGHUP */
314: do_reconf = 0;
315: syslog(LOG_INFO, "<%s> reloading config on SIGHUP",
316: __func__);
317: argc = if_argc;
318: argv = if_argv;
319: while (argc--)
320: getconfig(*argv++, 0);
321: }
322:
1.47 roy 323: /* timer expiration check and reset the timer */
324: timeout = rtadvd_check_timer();
325:
1.11 itojun 326: if (do_die) {
327: die();
328: /*NOTREACHED*/
329: }
330:
1.10 itojun 331: if (timeout != NULL) {
332: syslog(LOG_DEBUG,
1.30 rpaulo 333: "<%s> set timer to %ld:%ld. waiting for "
1.21 itojun 334: "inputs or timeout", __func__,
1.14 itojun 335: (long int)timeout->tv_sec,
1.47 roy 336: (long int)timeout->tv_nsec);
1.10 itojun 337: } else {
338: syslog(LOG_DEBUG,
1.14 itojun 339: "<%s> there's no timer. waiting for inputs",
1.21 itojun 340: __func__);
1.10 itojun 341: }
1.1 itojun 342:
1.51 ozaki-r 343: if ((i = prog_poll(set, 2, timeout ? (timeout->tv_sec * 1000 +
1.47 roy 344: (timeout->tv_nsec + 999999) / 1000000) : INFTIM)) < 0)
345: {
1.9 itojun 346: /* EINTR would occur upon SIGUSR1 for status dump */
347: if (errno != EINTR)
1.49 roy 348: syslog(LOG_ERR, "<%s> poll: %m", __func__);
1.1 itojun 349: continue;
350: }
351: if (i == 0) /* timeout */
352: continue;
1.23 mycroft 353: if (rtsock != -1 && set[1].revents & POLLIN)
1.1 itojun 354: rtmsg_input();
1.23 mycroft 355: if (set[0].revents & POLLIN)
1.1 itojun 356: rtadvd_input();
357: }
358: exit(0); /* NOTREACHED */
359: }
360:
361: static void
1.39 roy 362: rtadvd_set_dump_file(__unused int sig)
1.9 itojun 363: {
1.39 roy 364:
1.9 itojun 365: do_dump = 1;
366: }
367:
368: static void
1.39 roy 369: set_reconf(__unused int sig)
1.5 itojun 370: {
1.39 roy 371:
372: do_reconf = 1;
373: }
374:
375: static void
376: set_die(__unused int sig)
377: {
378:
1.11 itojun 379: do_die = 1;
380: }
381:
382: static void
1.36 roy 383: die(void)
1.11 itojun 384: {
1.41 roy 385: static int waiting;
386: struct rainfo *rai, *ran;
1.39 roy 387: struct rdnss *rdnss;
388: struct dnssl *dnssl;
1.5 itojun 389:
1.41 roy 390: if (waiting) {
391: if (TAILQ_FIRST(&ralist)) {
392: syslog(LOG_INFO,
393: "<%s> waiting for expiration of all RA timers",
394: __func__);
395: return;
396: }
397: syslog(LOG_NOTICE, "<%s> gracefully terminated", __func__);
398: free(rcvcmsgbuf);
399: free(sndcmsgbuf);
400: exit(0);
401: /* NOT REACHED */
402: }
403:
1.43 roy 404: if (TAILQ_FIRST(&ralist) == NULL) {
405: syslog(LOG_NOTICE, "<%s> gracefully terminated", __func__);
406: exit(0);
407: /* NOT REACHED */
408: }
409:
1.41 roy 410: waiting = 1;
411: syslog(LOG_NOTICE, "<%s> final RA transmission started", __func__);
412:
413: TAILQ_FOREACH_SAFE(rai, &ralist, next, ran) {
414: if (rai->leaving) {
415: TAILQ_REMOVE(&ralist, rai, next);
416: TAILQ_INSERT_HEAD(&ralist, rai->leaving, next);
417: rai->leaving->leaving = rai->leaving;
418: rai->leaving->leaving_for = rai->leaving;
419: free_rainfo(rai);
420: continue;
421: }
1.39 roy 422: rai->lifetime = 0;
423: TAILQ_FOREACH(rdnss, &rai->rdnss, next)
424: rdnss->lifetime = 0;
425: TAILQ_FOREACH(dnssl, &rai->dnssl, next)
426: dnssl->lifetime = 0;
427: make_packet(rai);
1.41 roy 428: rai->leaving = rai;
429: rai->leaving_for = rai;
430: rai->initcounter = MAX_INITIAL_RTR_ADVERTISEMENTS;
431: rai->mininterval = MIN_DELAY_BETWEEN_RAS;
432: rai->maxinterval = MIN_DELAY_BETWEEN_RAS;
433: rai->leaving_adv = MAX_FINAL_RTR_ADVERTISEMENTS;
434: ra_output(rai);
435: ra_timer_update((void *)rai, &rai->timer->tm);
436: rtadvd_set_timer(&rai->timer->tm, rai->timer);
1.5 itojun 437: }
438: }
439:
440: static void
1.36 roy 441: rtmsg_input(void)
1.1 itojun 442: {
1.9 itojun 443: int n, type, ifindex = 0, plen;
1.2 itojun 444: size_t len;
1.32 tron 445: union rt_msghdr_buf {
446: struct rt_msghdr rt_msghdr;
447: char data[2048];
448: } buffer;
1.39 roy 449: char *msg, *next, *lim, **argv;
1.31 mrg 450: char ifname[IF_NAMESIZE];
1.1 itojun 451: struct prefix *prefix;
452: struct rainfo *rai;
453: struct in6_addr *addr;
454: char addrbuf[INET6_ADDRSTRLEN];
1.39 roy 455: int prefixchange = 0, argc;
1.1 itojun 456:
1.39 roy 457: memset(&buffer, 0, sizeof(buffer));
1.51 ozaki-r 458: n = prog_read(rtsock, &buffer, sizeof(buffer));
1.41 roy 459:
460: /* We read the buffer first to clear the FD */
461: if (do_die)
462: return;
463:
1.32 tron 464: msg = buffer.data;
1.1 itojun 465: if (dflag > 1) {
1.14 itojun 466: syslog(LOG_DEBUG, "<%s> received a routing message "
1.39 roy 467: "(type = %d, len = %d)", __func__, rtmsg_type(msg),
468: rtmsg_len(msg));
1.1 itojun 469: }
470: if (n > rtmsg_len(msg)) {
471: /*
472: * This usually won't happen for messages received on
1.10 itojun 473: * a routing socket.
1.1 itojun 474: */
475: if (dflag > 1)
476: syslog(LOG_DEBUG,
1.14 itojun 477: "<%s> received data length is larger than "
478: "1st routing message len. multiple messages? "
479: "read %d bytes, but 1st msg len = %d",
1.21 itojun 480: __func__, n, rtmsg_len(msg));
1.1 itojun 481: #if 0
482: /* adjust length */
483: n = rtmsg_len(msg);
484: #endif
485: }
486:
487: lim = msg + n;
488: for (next = msg; next < lim; next += len) {
1.10 itojun 489: int oldifflags;
490:
1.1 itojun 491: next = get_next_msg(next, lim, 0, &len,
492: RTADV_TYPE2BITMASK(RTM_ADD) |
493: RTADV_TYPE2BITMASK(RTM_DELETE) |
494: RTADV_TYPE2BITMASK(RTM_NEWADDR) |
495: RTADV_TYPE2BITMASK(RTM_DELADDR) |
1.39 roy 496: #ifdef RTM_IFANNOUNCE
497: RTADV_TYPE2BITMASK(RTM_IFANNOUNCE) |
498: #endif
1.1 itojun 499: RTADV_TYPE2BITMASK(RTM_IFINFO));
500: if (len == 0)
501: break;
502: type = rtmsg_type(next);
503: switch (type) {
504: case RTM_ADD:
505: case RTM_DELETE:
506: ifindex = get_rtm_ifindex(next);
507: break;
508: case RTM_NEWADDR:
509: case RTM_DELADDR:
510: ifindex = get_ifam_ifindex(next);
511: break;
1.39 roy 512: #ifdef RTM_IFANNOUNCE
513: case RTM_IFANNOUNCE:
514: ifindex = get_ifan_ifindex(next);
515: if (get_ifan_what(next) == IFAN_ARRIVAL) {
516: syslog(LOG_DEBUG,
517: "<%s> interface %s arrived",
518: __func__,
519: if_indextoname(ifindex, ifname));
520: if (if_argc == 0) {
521: getconfig(ifname, 0);
522: continue;
523: }
524: argc = if_argc;
525: argv = if_argv;
526: while (argc--) {
527: if (strcmp(ifname, *argv++) == 0) {
528: getconfig(ifname, 0);
529: break;
530: }
531: }
532: continue;
533: }
534: break;
535: #endif
1.1 itojun 536: case RTM_IFINFO:
537: ifindex = get_ifm_ifindex(next);
538: break;
539: default:
540: /* should not reach here */
541: if (dflag > 1) {
542: syslog(LOG_DEBUG,
543: "<%s:%d> unknown rtmsg %d on %s",
1.21 itojun 544: __func__, __LINE__, type,
1.1 itojun 545: if_indextoname(ifindex, ifname));
546: }
1.10 itojun 547: continue;
1.1 itojun 548: }
549:
550: if ((rai = if_indextorainfo(ifindex)) == NULL) {
551: if (dflag > 1) {
552: syslog(LOG_DEBUG,
553: "<%s> route changed on "
1.39 roy 554: "non advertising interface %s (%d)",
1.21 itojun 555: __func__,
1.39 roy 556: if_indextoname(ifindex, ifname),
557: ifindex);
1.1 itojun 558: }
1.10 itojun 559: continue;
1.1 itojun 560: }
1.39 roy 561: oldifflags = rai->ifflags;
1.1 itojun 562:
1.14 itojun 563: switch (type) {
564: case RTM_ADD:
565: /* init ifflags because it may have changed */
1.39 roy 566: rai->ifflags = if_getflags(ifindex, rai->ifflags);
1.14 itojun 567:
568: if (sflag)
569: break; /* we aren't interested in prefixes */
570:
571: addr = get_addr(msg);
572: plen = get_prefixlen(msg);
573: /* sanity check for plen */
574: /* as RFC2373, prefixlen is at least 4 */
575: if (plen < 4 || plen > 127) {
1.1 itojun 576: syslog(LOG_INFO, "<%s> new interface route's"
1.14 itojun 577: "plen %d is invalid for a prefix",
1.21 itojun 578: __func__, plen);
1.14 itojun 579: break;
580: }
581: prefix = find_prefix(rai, addr, plen);
582: if (prefix) {
1.30 rpaulo 583: if (prefix->timer) {
584: /*
585: * If the prefix has been invalidated,
586: * make it available again.
587: */
588: update_prefix(prefix);
589: prefixchange = 1;
590: } else if (dflag > 1) {
1.14 itojun 591: syslog(LOG_DEBUG,
592: "<%s> new prefix(%s/%d) "
593: "added on %s, "
594: "but it was already in list",
1.21 itojun 595: __func__,
1.14 itojun 596: inet_ntop(AF_INET6, addr,
597: (char *)addrbuf, INET6_ADDRSTRLEN),
598: plen, rai->ifname);
599: }
1.10 itojun 600: break;
1.14 itojun 601: }
602: make_prefix(rai, ifindex, addr, plen);
1.30 rpaulo 603: prefixchange = 1;
1.14 itojun 604: break;
605: case RTM_DELETE:
606: /* init ifflags because it may have changed */
1.39 roy 607: rai->ifflags = if_getflags(ifindex, rai->ifflags);
1.14 itojun 608:
609: if (sflag)
1.10 itojun 610: break;
1.14 itojun 611:
612: addr = get_addr(msg);
613: plen = get_prefixlen(msg);
614: /* sanity check for plen */
615: /* as RFC2373, prefixlen is at least 4 */
616: if (plen < 4 || plen > 127) {
617: syslog(LOG_INFO,
618: "<%s> deleted interface route's "
619: "plen %d is invalid for a prefix",
1.21 itojun 620: __func__, plen);
1.14 itojun 621: break;
622: }
623: prefix = find_prefix(rai, addr, plen);
624: if (prefix == NULL) {
625: if (dflag > 1) {
626: syslog(LOG_DEBUG,
627: "<%s> prefix(%s/%d) was "
628: "deleted on %s, "
629: "but it was not in list",
1.21 itojun 630: __func__,
1.14 itojun 631: inet_ntop(AF_INET6, addr,
632: (char *)addrbuf, INET6_ADDRSTRLEN),
633: plen, rai->ifname);
634: }
635: break;
636: }
1.30 rpaulo 637: invalidate_prefix(prefix);
638: prefixchange = 1;
1.14 itojun 639: break;
1.1 itojun 640: case RTM_NEWADDR:
641: case RTM_DELADDR:
1.14 itojun 642: /* init ifflags because it may have changed */
1.39 roy 643: rai->ifflags = if_getflags(ifindex, rai->ifflags);
1.14 itojun 644: break;
1.1 itojun 645: case RTM_IFINFO:
1.39 roy 646: rai->ifflags = get_ifm_flags(next);
1.14 itojun 647: break;
1.39 roy 648: #ifdef RTM_IFANNOUNCE
649: case RTM_IFANNOUNCE:
650: if (get_ifan_what(next) == IFAN_DEPARTURE) {
651: syslog(LOG_DEBUG,
652: "<%s> interface %s departed",
653: __func__, rai->ifname);
654: TAILQ_REMOVE(&ralist, rai, next);
655: if (rai->leaving)
656: free_rainfo(rai->leaving);
657: free_rainfo(rai);
658: continue;
659: }
660: break;
661: #endif
1.1 itojun 662: default:
663: /* should not reach here */
664: if (dflag > 1) {
665: syslog(LOG_DEBUG,
1.14 itojun 666: "<%s:%d> unknown rtmsg %d on %s",
1.21 itojun 667: __func__, __LINE__, type,
1.14 itojun 668: if_indextoname(ifindex, ifname));
1.1 itojun 669: }
670: return;
671: }
1.10 itojun 672:
673: /* check if an interface flag is changed */
674: if ((oldifflags & IFF_UP) != 0 && /* UP to DOWN */
1.39 roy 675: (rai->ifflags & IFF_UP) == 0) {
1.10 itojun 676: syslog(LOG_INFO,
1.14 itojun 677: "<%s> interface %s becomes down. stop timer.",
1.21 itojun 678: __func__, rai->ifname);
1.10 itojun 679: rtadvd_remove_timer(&rai->timer);
1.18 itojun 680: } else if ((oldifflags & IFF_UP) == 0 && /* DOWN to UP */
1.39 roy 681: (rai->ifflags & IFF_UP) != 0) {
1.10 itojun 682: syslog(LOG_INFO,
1.14 itojun 683: "<%s> interface %s becomes up. restart timer.",
1.21 itojun 684: __func__, rai->ifname);
1.10 itojun 685:
686: rai->initcounter = 0; /* reset the counter */
687: rai->waiting = 0; /* XXX */
1.39 roy 688: rtadvd_remove_timer(&rai->timer);
1.10 itojun 689: rai->timer = rtadvd_add_timer(ra_timeout,
1.14 itojun 690: ra_timer_update, rai, rai);
1.10 itojun 691: ra_timer_update((void *)rai, &rai->timer->tm);
692: rtadvd_set_timer(&rai->timer->tm, rai->timer);
1.39 roy 693: } else if (prefixchange && rai->ifflags & IFF_UP) {
1.30 rpaulo 694: /*
695: * An advertised prefix has been added or invalidated.
696: * Will notice the change in a short delay.
697: */
698: rai->initcounter = 0;
1.39 roy 699: ra_timer_set_short_delay(rai);
1.10 itojun 700: }
1.1 itojun 701: }
702:
703: return;
704: }
705:
706: void
1.36 roy 707: rtadvd_input(void)
1.1 itojun 708: {
1.36 roy 709: ssize_t i;
1.1 itojun 710: int *hlimp = NULL;
711: #ifdef OLDRAWSOCKET
712: struct ip6_hdr *ip;
713: #endif
714: struct icmp6_hdr *icp;
715: int ifindex = 0;
716: struct cmsghdr *cm;
717: struct in6_pktinfo *pi = NULL;
1.31 mrg 718: char ntopbuf[INET6_ADDRSTRLEN], ifnamebuf[IFNAMSIZ];
1.1 itojun 719: struct in6_addr dst = in6addr_any;
1.39 roy 720: struct rainfo *rai;
1.1 itojun 721:
722: /*
723: * Get message. We reset msg_controllen since the field could
724: * be modified if we had received a message before setting
725: * receive options.
726: */
1.6 itojun 727: rcvmhdr.msg_controllen = rcvcmsgbuflen;
1.51 ozaki-r 728: if ((i = prog_recvmsg(sock, &rcvmhdr, 0)) < 0)
1.1 itojun 729: return;
730:
1.41 roy 731: /* We read the buffer first to clear the FD */
732: if (do_die)
733: return;
734:
1.1 itojun 735: /* extract optional information via Advanced API */
736: for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(&rcvmhdr);
737: cm;
738: cm = (struct cmsghdr *)CMSG_NXTHDR(&rcvmhdr, cm)) {
739: if (cm->cmsg_level == IPPROTO_IPV6 &&
740: cm->cmsg_type == IPV6_PKTINFO &&
741: cm->cmsg_len == CMSG_LEN(sizeof(struct in6_pktinfo))) {
742: pi = (struct in6_pktinfo *)(CMSG_DATA(cm));
743: ifindex = pi->ipi6_ifindex;
744: dst = pi->ipi6_addr;
745: }
746: if (cm->cmsg_level == IPPROTO_IPV6 &&
747: cm->cmsg_type == IPV6_HOPLIMIT &&
748: cm->cmsg_len == CMSG_LEN(sizeof(int)))
749: hlimp = (int *)CMSG_DATA(cm);
750: }
751: if (ifindex == 0) {
752: syslog(LOG_ERR,
753: "<%s> failed to get receiving interface",
1.21 itojun 754: __func__);
1.1 itojun 755: return;
756: }
757: if (hlimp == NULL) {
758: syslog(LOG_ERR,
759: "<%s> failed to get receiving hop limit",
1.21 itojun 760: __func__);
1.1 itojun 761: return;
762: }
763:
1.39 roy 764: if ((rai = if_indextorainfo(pi->ipi6_ifindex)) == NULL) {
765: if (dflag > 1) {
766: syslog(LOG_DEBUG,
767: "<%s> received data for non advertising "
768: "interface (%s)",
769: __func__,
770: if_indextoname(pi->ipi6_ifindex, ifnamebuf));
771: }
772: return;
773: }
1.10 itojun 774: /*
775: * If we happen to receive data on an interface which is now down,
776: * just discard the data.
777: */
1.39 roy 778: if ((rai->ifflags & IFF_UP) == 0) {
1.10 itojun 779: syslog(LOG_INFO,
780: "<%s> received data on a disabled interface (%s)",
1.21 itojun 781: __func__,
1.10 itojun 782: if_indextoname(pi->ipi6_ifindex, ifnamebuf));
783: return;
784: }
785:
1.1 itojun 786: #ifdef OLDRAWSOCKET
1.36 roy 787: if ((size_t)i < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr)) {
1.1 itojun 788: syslog(LOG_ERR,
789: "<%s> packet size(%d) is too short",
1.21 itojun 790: __func__, i);
1.1 itojun 791: return;
792: }
793:
794: ip = (struct ip6_hdr *)rcvmhdr.msg_iov[0].iov_base;
795: icp = (struct icmp6_hdr *)(ip + 1); /* XXX: ext. hdr? */
796: #else
1.36 roy 797: if ((size_t)i < sizeof(struct icmp6_hdr)) {
1.1 itojun 798: syslog(LOG_ERR,
1.36 roy 799: "<%s> packet size(%zd) is too short",
1.21 itojun 800: __func__, i);
1.1 itojun 801: return;
802: }
803:
804: icp = (struct icmp6_hdr *)rcvmhdr.msg_iov[0].iov_base;
1.10 itojun 805: #endif
1.1 itojun 806:
1.14 itojun 807: switch (icp->icmp6_type) {
808: case ND_ROUTER_SOLICIT:
809: /*
810: * Message verification - RFC-2461 6.1.1
811: * XXX: these checks must be done in the kernel as well,
812: * but we can't completely rely on them.
813: */
814: if (*hlimp != 255) {
815: syslog(LOG_NOTICE,
816: "<%s> RS with invalid hop limit(%d) "
817: "received from %s on %s",
1.21 itojun 818: __func__, *hlimp,
1.30 rpaulo 819: inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf,
1.14 itojun 820: INET6_ADDRSTRLEN),
821: if_indextoname(pi->ipi6_ifindex, ifnamebuf));
822: return;
823: }
824: if (icp->icmp6_code) {
825: syslog(LOG_NOTICE,
826: "<%s> RS with invalid ICMP6 code(%d) "
827: "received from %s on %s",
1.21 itojun 828: __func__, icp->icmp6_code,
1.30 rpaulo 829: inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf,
1.14 itojun 830: INET6_ADDRSTRLEN),
831: if_indextoname(pi->ipi6_ifindex, ifnamebuf));
832: return;
833: }
1.36 roy 834: if ((size_t)i < sizeof(struct nd_router_solicit)) {
1.14 itojun 835: syslog(LOG_NOTICE,
836: "<%s> RS from %s on %s does not have enough "
1.36 roy 837: "length (len = %zd)",
1.21 itojun 838: __func__,
1.30 rpaulo 839: inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf,
1.14 itojun 840: INET6_ADDRSTRLEN),
841: if_indextoname(pi->ipi6_ifindex, ifnamebuf), i);
842: return;
843: }
1.30 rpaulo 844: rs_input(i, (struct nd_router_solicit *)icp, pi, &rcvfrom);
1.14 itojun 845: break;
846: case ND_ROUTER_ADVERT:
847: /*
848: * Message verification - RFC-2461 6.1.2
849: * XXX: there's a same dilemma as above...
850: */
851: if (*hlimp != 255) {
852: syslog(LOG_NOTICE,
853: "<%s> RA with invalid hop limit(%d) "
854: "received from %s on %s",
1.21 itojun 855: __func__, *hlimp,
1.30 rpaulo 856: inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf,
1.14 itojun 857: INET6_ADDRSTRLEN),
858: if_indextoname(pi->ipi6_ifindex, ifnamebuf));
859: return;
860: }
861: if (icp->icmp6_code) {
862: syslog(LOG_NOTICE,
863: "<%s> RA with invalid ICMP6 code(%d) "
864: "received from %s on %s",
1.21 itojun 865: __func__, icp->icmp6_code,
1.30 rpaulo 866: inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf,
1.14 itojun 867: INET6_ADDRSTRLEN),
868: if_indextoname(pi->ipi6_ifindex, ifnamebuf));
869: return;
870: }
1.36 roy 871: if ((size_t)i < sizeof(struct nd_router_advert)) {
1.14 itojun 872: syslog(LOG_NOTICE,
873: "<%s> RA from %s on %s does not have enough "
1.36 roy 874: "length (len = %zd)",
1.21 itojun 875: __func__,
1.30 rpaulo 876: inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf,
1.14 itojun 877: INET6_ADDRSTRLEN),
878: if_indextoname(pi->ipi6_ifindex, ifnamebuf), i);
879: return;
880: }
1.30 rpaulo 881: ra_input(i, (struct nd_router_advert *)icp, pi, &rcvfrom);
1.14 itojun 882: break;
883: case ICMP6_ROUTER_RENUMBERING:
884: if (accept_rr == 0) {
885: syslog(LOG_ERR, "<%s> received a router renumbering "
886: "message, but not allowed to be accepted",
1.21 itojun 887: __func__);
1.14 itojun 888: break;
889: }
1.30 rpaulo 890: rr_input(i, (struct icmp6_router_renum *)icp, pi, &rcvfrom,
1.14 itojun 891: &dst);
892: break;
893: default:
894: /*
895: * Note that this case is POSSIBLE, especially just
896: * after invocation of the daemon. This is because we
897: * could receive message after opening the socket and
898: * before setting ICMP6 type filter(see sock_open()).
899: */
900: syslog(LOG_ERR, "<%s> invalid icmp type(%d)",
1.21 itojun 901: __func__, icp->icmp6_type);
1.14 itojun 902: return;
1.1 itojun 903: }
904:
905: return;
906: }
907:
908: static void
909: rs_input(int len, struct nd_router_solicit *rs,
910: struct in6_pktinfo *pi, struct sockaddr_in6 *from)
911: {
1.31 mrg 912: char ntopbuf[INET6_ADDRSTRLEN], ifnamebuf[IFNAMSIZ];
1.1 itojun 913: union nd_opts ndopts;
1.39 roy 914: struct rainfo *rai;
1.30 rpaulo 915: struct soliciter *sol;
1.1 itojun 916:
917: syslog(LOG_DEBUG,
918: "<%s> RS received from %s on %s",
1.21 itojun 919: __func__,
1.1 itojun 920: inet_ntop(AF_INET6, &from->sin6_addr,
921: ntopbuf, INET6_ADDRSTRLEN),
922: if_indextoname(pi->ipi6_ifindex, ifnamebuf));
923:
924: /* ND option check */
925: memset(&ndopts, 0, sizeof(ndopts));
1.36 roy 926: TAILQ_INIT(&ndopts.nd_opts_list);
1.1 itojun 927: if (nd6_options((struct nd_opt_hdr *)(rs + 1),
928: len - sizeof(struct nd_router_solicit),
1.18 itojun 929: &ndopts, NDOPT_FLAG_SRCLINKADDR)) {
1.30 rpaulo 930: syslog(LOG_INFO,
1.1 itojun 931: "<%s> ND option check failed for an RS from %s on %s",
1.21 itojun 932: __func__,
1.1 itojun 933: inet_ntop(AF_INET6, &from->sin6_addr,
934: ntopbuf, INET6_ADDRSTRLEN),
935: if_indextoname(pi->ipi6_ifindex, ifnamebuf));
936: return;
937: }
938:
939: /*
940: * If the IP source address is the unspecified address, there
941: * must be no source link-layer address option in the message.
942: * (RFC-2461 6.1.1)
943: */
944: if (IN6_IS_ADDR_UNSPECIFIED(&from->sin6_addr) &&
945: ndopts.nd_opts_src_lladdr) {
1.30 rpaulo 946: syslog(LOG_INFO,
1.1 itojun 947: "<%s> RS from unspecified src on %s has a link-layer"
948: " address option",
1.21 itojun 949: __func__,
1.1 itojun 950: if_indextoname(pi->ipi6_ifindex, ifnamebuf));
951: goto done;
952: }
953:
1.39 roy 954: if ((rai = if_indextorainfo(pi->ipi6_ifindex)) == NULL) {
1.1 itojun 955: syslog(LOG_INFO,
956: "<%s> RS received on non advertising interface(%s)",
1.21 itojun 957: __func__,
1.1 itojun 958: if_indextoname(pi->ipi6_ifindex, ifnamebuf));
959: goto done;
960: }
961:
1.39 roy 962: if (rai->leaving) {
963: syslog(LOG_INFO,
964: "<%s> RS received on reconfiguring advertising interface(%s)",
965: __func__, rai->ifname);
966: goto done;
967: }
968:
969: rai->rsinput++; /* increment statistics */
1.9 itojun 970:
1.1 itojun 971: /*
972: * Decide whether to send RA according to the rate-limit
973: * consideration.
974: */
1.10 itojun 975:
1.30 rpaulo 976: /* record sockaddr waiting for RA, if possible */
1.36 roy 977: sol = malloc(sizeof(*sol));
1.30 rpaulo 978: if (sol) {
979: sol->addr = *from;
980: /* XXX RFC2553 need clarification on flowinfo */
981: sol->addr.sin6_flowinfo = 0;
1.39 roy 982: TAILQ_INSERT_HEAD(&rai->soliciter, sol, next);
1.30 rpaulo 983: }
984:
985: /*
986: * If there is already a waiting RS packet, don't
987: * update the timer.
988: */
1.39 roy 989: if (rai->waiting++)
1.30 rpaulo 990: goto done;
991:
1.39 roy 992: ra_timer_set_short_delay(rai);
1.1 itojun 993:
1.30 rpaulo 994: done:
995: free_ndopts(&ndopts);
996: return;
997: }
1.1 itojun 998:
1.39 roy 999: void
1000: ra_timer_set_short_delay(struct rainfo *rai)
1.30 rpaulo 1001: {
1002: long delay; /* must not be greater than 1000000 */
1.47 roy 1003: struct timespec interval, now, min_delay, tm_tmp, *rest;
1.1 itojun 1004:
1.30 rpaulo 1005: /*
1006: * Compute a random delay. If the computed value
1007: * corresponds to a time later than the time the next
1008: * multicast RA is scheduled to be sent, ignore the random
1009: * delay and send the advertisement at the
1010: * already-scheduled time. RFC2461 6.2.6
1011: */
1012: delay = arc4random() % MAX_RA_DELAY_TIME;
1013: interval.tv_sec = 0;
1.47 roy 1014: interval.tv_nsec = delay;
1.30 rpaulo 1015: rest = rtadvd_timer_rest(rai->timer);
1.47 roy 1016: if (timespeccmp(rest, &interval, <)) {
1.30 rpaulo 1017: syslog(LOG_DEBUG, "<%s> random delay is larger than "
1018: "the rest of current timer", __func__);
1019: interval = *rest;
1.1 itojun 1020: }
1021:
1.30 rpaulo 1022: /*
1023: * If we sent a multicast Router Advertisement within
1024: * the last MIN_DELAY_BETWEEN_RAS seconds, schedule
1025: * the advertisement to be sent at a time corresponding to
1026: * MIN_DELAY_BETWEEN_RAS plus the random value after the
1027: * previous advertisement was sent.
1028: */
1.51 ozaki-r 1029: prog_clock_gettime(CLOCK_MONOTONIC, &now);
1.47 roy 1030: timespecsub(&now, &rai->lastsent, &tm_tmp);
1.30 rpaulo 1031: min_delay.tv_sec = MIN_DELAY_BETWEEN_RAS;
1.47 roy 1032: min_delay.tv_nsec = 0;
1033: if (timespeccmp(&tm_tmp, &min_delay, <)) {
1034: timespecsub(&min_delay, &tm_tmp, &min_delay);
1035: timespecadd(&min_delay, &interval, &interval);
1.30 rpaulo 1036: }
1037: rtadvd_set_timer(&interval, rai->timer);
1.1 itojun 1038: }
1039:
1040: static void
1041: ra_input(int len, struct nd_router_advert *ra,
1042: struct in6_pktinfo *pi, struct sockaddr_in6 *from)
1043: {
1044: struct rainfo *rai;
1.31 mrg 1045: char ntopbuf[INET6_ADDRSTRLEN], ifnamebuf[IFNAMSIZ];
1.1 itojun 1046: union nd_opts ndopts;
1.36 roy 1047: const char *on_off[] = {"OFF", "ON"};
1048: uint32_t reachabletime, retranstimer, mtu;
1049: struct nd_optlist *optp;
1.9 itojun 1050: int inconsistent = 0;
1.1 itojun 1051:
1052: syslog(LOG_DEBUG,
1053: "<%s> RA received from %s on %s",
1.21 itojun 1054: __func__,
1.1 itojun 1055: inet_ntop(AF_INET6, &from->sin6_addr,
1056: ntopbuf, INET6_ADDRSTRLEN),
1057: if_indextoname(pi->ipi6_ifindex, ifnamebuf));
1.36 roy 1058:
1.1 itojun 1059: /* ND option check */
1060: memset(&ndopts, 0, sizeof(ndopts));
1.36 roy 1061: TAILQ_INIT(&ndopts.nd_opts_list);
1.1 itojun 1062: if (nd6_options((struct nd_opt_hdr *)(ra + 1),
1.36 roy 1063: len - sizeof(struct nd_router_advert),
1064: &ndopts, NDOPT_FLAG_SRCLINKADDR |
1065: NDOPT_FLAG_PREFIXINFO | NDOPT_FLAG_MTU |
1066: NDOPT_FLAG_RDNSS | NDOPT_FLAG_DNSSL))
1067: {
1.30 rpaulo 1068: syslog(LOG_INFO,
1.36 roy 1069: "<%s> ND option check failed for an RA from %s on %s",
1070: __func__,
1071: inet_ntop(AF_INET6, &from->sin6_addr,
1072: ntopbuf, INET6_ADDRSTRLEN),
1073: if_indextoname(pi->ipi6_ifindex, ifnamebuf));
1.1 itojun 1074: return;
1075: }
1076:
1077: /*
1078: * RA consistency check according to RFC-2461 6.2.7
1079: */
1080: if ((rai = if_indextorainfo(pi->ipi6_ifindex)) == 0) {
1081: syslog(LOG_INFO,
1082: "<%s> received RA from %s on non-advertising"
1083: " interface(%s)",
1.21 itojun 1084: __func__,
1.1 itojun 1085: inet_ntop(AF_INET6, &from->sin6_addr,
1086: ntopbuf, INET6_ADDRSTRLEN),
1087: if_indextoname(pi->ipi6_ifindex, ifnamebuf));
1088: goto done;
1089: }
1.39 roy 1090: if (rai->leaving) {
1091: syslog(LOG_DEBUG,
1.45 plunky 1092: "<%s> received RA on re-configuring interface (%s)",
1.39 roy 1093: __func__, rai->ifname);
1094: goto done;
1095: }
1.9 itojun 1096: rai->rainput++; /* increment statistics */
1097:
1.1 itojun 1098: /* Cur Hop Limit value */
1099: if (ra->nd_ra_curhoplimit && rai->hoplimit &&
1100: ra->nd_ra_curhoplimit != rai->hoplimit) {
1.11 itojun 1101: syslog(LOG_INFO,
1.1 itojun 1102: "<%s> CurHopLimit inconsistent on %s:"
1103: " %d from %s, %d from us",
1.21 itojun 1104: __func__,
1.1 itojun 1105: rai->ifname,
1106: ra->nd_ra_curhoplimit,
1107: inet_ntop(AF_INET6, &from->sin6_addr,
1108: ntopbuf, INET6_ADDRSTRLEN),
1109: rai->hoplimit);
1.9 itojun 1110: inconsistent++;
1.1 itojun 1111: }
1112: /* M flag */
1113: if ((ra->nd_ra_flags_reserved & ND_RA_FLAG_MANAGED) !=
1114: rai->managedflg) {
1.11 itojun 1115: syslog(LOG_INFO,
1.1 itojun 1116: "<%s> M flag inconsistent on %s:"
1117: " %s from %s, %s from us",
1.21 itojun 1118: __func__,
1.1 itojun 1119: rai->ifname,
1120: on_off[!rai->managedflg],
1121: inet_ntop(AF_INET6, &from->sin6_addr,
1122: ntopbuf, INET6_ADDRSTRLEN),
1123: on_off[rai->managedflg]);
1.9 itojun 1124: inconsistent++;
1.1 itojun 1125: }
1126: /* O flag */
1127: if ((ra->nd_ra_flags_reserved & ND_RA_FLAG_OTHER) !=
1128: rai->otherflg) {
1.11 itojun 1129: syslog(LOG_INFO,
1.1 itojun 1130: "<%s> O flag inconsistent on %s:"
1131: " %s from %s, %s from us",
1.21 itojun 1132: __func__,
1.1 itojun 1133: rai->ifname,
1134: on_off[!rai->otherflg],
1135: inet_ntop(AF_INET6, &from->sin6_addr,
1136: ntopbuf, INET6_ADDRSTRLEN),
1137: on_off[rai->otherflg]);
1.9 itojun 1138: inconsistent++;
1.1 itojun 1139: }
1140: /* Reachable Time */
1141: reachabletime = ntohl(ra->nd_ra_reachable);
1142: if (reachabletime && rai->reachabletime &&
1143: reachabletime != rai->reachabletime) {
1.11 itojun 1144: syslog(LOG_INFO,
1.1 itojun 1145: "<%s> ReachableTime inconsistent on %s:"
1146: " %d from %s, %d from us",
1.21 itojun 1147: __func__,
1.1 itojun 1148: rai->ifname,
1149: reachabletime,
1150: inet_ntop(AF_INET6, &from->sin6_addr,
1151: ntopbuf, INET6_ADDRSTRLEN),
1152: rai->reachabletime);
1.9 itojun 1153: inconsistent++;
1.1 itojun 1154: }
1155: /* Retrans Timer */
1156: retranstimer = ntohl(ra->nd_ra_retransmit);
1157: if (retranstimer && rai->retranstimer &&
1158: retranstimer != rai->retranstimer) {
1.11 itojun 1159: syslog(LOG_INFO,
1.1 itojun 1160: "<%s> RetranceTimer inconsistent on %s:"
1161: " %d from %s, %d from us",
1.21 itojun 1162: __func__,
1.1 itojun 1163: rai->ifname,
1164: retranstimer,
1165: inet_ntop(AF_INET6, &from->sin6_addr,
1166: ntopbuf, INET6_ADDRSTRLEN),
1167: rai->retranstimer);
1.9 itojun 1168: inconsistent++;
1.1 itojun 1169: }
1170: /* Values in the MTU options */
1171: if (ndopts.nd_opts_mtu) {
1172: mtu = ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu);
1173: if (mtu && rai->linkmtu && mtu != rai->linkmtu) {
1.11 itojun 1174: syslog(LOG_INFO,
1.1 itojun 1175: "<%s> MTU option value inconsistent on %s:"
1176: " %d from %s, %d from us",
1.21 itojun 1177: __func__,
1.1 itojun 1178: rai->ifname, mtu,
1179: inet_ntop(AF_INET6, &from->sin6_addr,
1180: ntopbuf, INET6_ADDRSTRLEN),
1181: rai->linkmtu);
1.9 itojun 1182: inconsistent++;
1.1 itojun 1183: }
1184: }
1185: /* Preferred and Valid Lifetimes for prefixes */
1.36 roy 1186: if (ndopts.nd_opts_pi)
1187: if (prefix_check(ndopts.nd_opts_pi, rai, from))
1188: inconsistent++;
1189: TAILQ_FOREACH(optp, &ndopts.nd_opts_list, next)
1190: if (prefix_check((struct nd_opt_prefix_info *)optp->opt,
1191: rai, from))
1192: inconsistent++;
1.9 itojun 1193:
1.11 itojun 1194: if (inconsistent)
1.9 itojun 1195: rai->rainconsistent++;
1.1 itojun 1196:
1.30 rpaulo 1197: done:
1.1 itojun 1198: free_ndopts(&ndopts);
1199: return;
1200: }
1201:
1.9 itojun 1202: /* return a non-zero value if the received prefix is inconsitent with ours */
1203: static int
1.1 itojun 1204: prefix_check(struct nd_opt_prefix_info *pinfo,
1205: struct rainfo *rai, struct sockaddr_in6 *from)
1206: {
1.36 roy 1207: uint32_t preferred_time, valid_time;
1.1 itojun 1208: struct prefix *pp;
1.9 itojun 1209: int inconsistent = 0;
1.31 mrg 1210: char ntopbuf[INET6_ADDRSTRLEN], prefixbuf[INET6_ADDRSTRLEN];
1.47 roy 1211: struct timespec now;
1.1 itojun 1212:
1213: #if 0 /* impossible */
1214: if (pinfo->nd_opt_pi_type != ND_OPT_PREFIX_INFORMATION)
1.9 itojun 1215: return(0);
1.1 itojun 1216: #endif
1217:
1218: /*
1219: * log if the adveritsed prefix has link-local scope(sanity check?)
1220: */
1221: if (IN6_IS_ADDR_LINKLOCAL(&pinfo->nd_opt_pi_prefix)) {
1222: syslog(LOG_INFO,
1223: "<%s> link-local prefix %s/%d is advertised "
1224: "from %s on %s",
1.21 itojun 1225: __func__,
1.1 itojun 1226: inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix,
1227: prefixbuf, INET6_ADDRSTRLEN),
1228: pinfo->nd_opt_pi_prefix_len,
1229: inet_ntop(AF_INET6, &from->sin6_addr,
1230: ntopbuf, INET6_ADDRSTRLEN),
1231: rai->ifname);
1232: }
1233:
1234: if ((pp = find_prefix(rai, &pinfo->nd_opt_pi_prefix,
1235: pinfo->nd_opt_pi_prefix_len)) == NULL) {
1236: syslog(LOG_INFO,
1237: "<%s> prefix %s/%d from %s on %s is not in our list",
1.21 itojun 1238: __func__,
1.1 itojun 1239: inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix,
1240: prefixbuf, INET6_ADDRSTRLEN),
1241: pinfo->nd_opt_pi_prefix_len,
1242: inet_ntop(AF_INET6, &from->sin6_addr,
1243: ntopbuf, INET6_ADDRSTRLEN),
1244: rai->ifname);
1.9 itojun 1245: return(0);
1.1 itojun 1246: }
1247:
1248: preferred_time = ntohl(pinfo->nd_opt_pi_preferred_time);
1.11 itojun 1249: if (pp->pltimeexpire) {
1250: /*
1251: * The lifetime is decremented in real time, so we should
1252: * compare the expiration time.
1253: * (RFC 2461 Section 6.2.7.)
1254: * XXX: can we really expect that all routers on the link
1255: * have synchronized clocks?
1256: */
1.51 ozaki-r 1257: prog_clock_gettime(CLOCK_MONOTONIC, &now);
1.11 itojun 1258: preferred_time += now.tv_sec;
1259:
1.30 rpaulo 1260: if (!pp->timer && rai->clockskew &&
1.46 joerg 1261: llabs((long long)preferred_time - pp->pltimeexpire) > rai->clockskew) {
1.11 itojun 1262: syslog(LOG_INFO,
1.30 rpaulo 1263: "<%s> preferred lifetime for %s/%d"
1.11 itojun 1264: " (decr. in real time) inconsistent on %s:"
1265: " %d from %s, %ld from us",
1.21 itojun 1266: __func__,
1.11 itojun 1267: inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix,
1268: prefixbuf, INET6_ADDRSTRLEN),
1269: pinfo->nd_opt_pi_prefix_len,
1270: rai->ifname, preferred_time,
1271: inet_ntop(AF_INET6, &from->sin6_addr,
1272: ntopbuf, INET6_ADDRSTRLEN),
1273: pp->pltimeexpire);
1274: inconsistent++;
1275: }
1.30 rpaulo 1276: } else if (!pp->timer && preferred_time != pp->preflifetime) {
1.11 itojun 1277: syslog(LOG_INFO,
1.30 rpaulo 1278: "<%s> preferred lifetime for %s/%d"
1.1 itojun 1279: " inconsistent on %s:"
1280: " %d from %s, %d from us",
1.21 itojun 1281: __func__,
1.1 itojun 1282: inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix,
1283: prefixbuf, INET6_ADDRSTRLEN),
1284: pinfo->nd_opt_pi_prefix_len,
1285: rai->ifname, preferred_time,
1286: inet_ntop(AF_INET6, &from->sin6_addr,
1287: ntopbuf, INET6_ADDRSTRLEN),
1288: pp->preflifetime);
1.9 itojun 1289: }
1.1 itojun 1290:
1291: valid_time = ntohl(pinfo->nd_opt_pi_valid_time);
1.11 itojun 1292: if (pp->vltimeexpire) {
1.51 ozaki-r 1293: prog_clock_gettime(CLOCK_MONOTONIC, &now);
1.11 itojun 1294: valid_time += now.tv_sec;
1295:
1.30 rpaulo 1296: if (!pp->timer && rai->clockskew &&
1.46 joerg 1297: llabs((long long)valid_time - pp->vltimeexpire) > rai->clockskew) {
1.11 itojun 1298: syslog(LOG_INFO,
1299: "<%s> valid lifetime for %s/%d"
1300: " (decr. in real time) inconsistent on %s:"
1301: " %d from %s, %ld from us",
1.21 itojun 1302: __func__,
1.11 itojun 1303: inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix,
1304: prefixbuf, INET6_ADDRSTRLEN),
1305: pinfo->nd_opt_pi_prefix_len,
1306: rai->ifname, preferred_time,
1307: inet_ntop(AF_INET6, &from->sin6_addr,
1308: ntopbuf, INET6_ADDRSTRLEN),
1309: pp->vltimeexpire);
1310: inconsistent++;
1311: }
1.30 rpaulo 1312: } else if (!pp->timer && valid_time != pp->validlifetime) {
1.11 itojun 1313: syslog(LOG_INFO,
1.1 itojun 1314: "<%s> valid lifetime for %s/%d"
1315: " inconsistent on %s:"
1316: " %d from %s, %d from us",
1.21 itojun 1317: __func__,
1.1 itojun 1318: inet_ntop(AF_INET6, &pinfo->nd_opt_pi_prefix,
1319: prefixbuf, INET6_ADDRSTRLEN),
1320: pinfo->nd_opt_pi_prefix_len,
1321: rai->ifname, valid_time,
1322: inet_ntop(AF_INET6, &from->sin6_addr,
1323: ntopbuf, INET6_ADDRSTRLEN),
1324: pp->validlifetime);
1.9 itojun 1325: inconsistent++;
1326: }
1327:
1328: return(inconsistent);
1.1 itojun 1329: }
1330:
1331: struct prefix *
1332: find_prefix(struct rainfo *rai, struct in6_addr *prefix, int plen)
1333: {
1334: struct prefix *pp;
1335: int bytelen, bitlen;
1.36 roy 1336: unsigned char bitmask;
1.1 itojun 1337:
1.36 roy 1338: TAILQ_FOREACH(pp, &rai->prefix, next) {
1.1 itojun 1339: if (plen != pp->prefixlen)
1340: continue;
1341: bytelen = plen / 8;
1342: bitlen = plen % 8;
1.15 itojun 1343: bitmask = 0xff << (8 - bitlen);
1.1 itojun 1344: if (memcmp((void *)prefix, (void *)&pp->prefix, bytelen))
1345: continue;
1.15 itojun 1346: if (bitlen == 0 ||
1347: ((prefix->s6_addr[bytelen] & bitmask) ==
1348: (pp->prefix.s6_addr[bytelen] & bitmask))) {
1.1 itojun 1349: return(pp);
1.15 itojun 1350: }
1.1 itojun 1351: }
1352:
1353: return(NULL);
1354: }
1355:
1.11 itojun 1356: /* check if p0/plen0 matches p1/plen1; return 1 if matches, otherwise 0. */
1357: int
1358: prefix_match(struct in6_addr *p0, int plen0,
1359: struct in6_addr *p1, int plen1)
1360: {
1361: int bytelen, bitlen;
1.36 roy 1362: unsigned char bitmask;
1.11 itojun 1363:
1364: if (plen0 < plen1)
1365: return(0);
1366: bytelen = plen1 / 8;
1367: bitlen = plen1 % 8;
1.15 itojun 1368: bitmask = 0xff << (8 - bitlen);
1.11 itojun 1369: if (memcmp((void *)p0, (void *)p1, bytelen))
1370: return(0);
1.15 itojun 1371: if (bitlen == 0 ||
1372: ((p0->s6_addr[bytelen] & bitmask) ==
1373: (p1->s6_addr[bytelen] & bitmask))) {
1.11 itojun 1374: return(1);
1.15 itojun 1375: }
1.11 itojun 1376:
1377: return(0);
1378: }
1379:
1.1 itojun 1380: static int
1381: nd6_options(struct nd_opt_hdr *hdr, int limit,
1.36 roy 1382: union nd_opts *ndopts, uint32_t optflags)
1.1 itojun 1383: {
1384: int optlen = 0;
1385:
1386: for (; limit > 0; limit -= optlen) {
1.36 roy 1387: if ((size_t)limit < sizeof(struct nd_opt_hdr)) {
1.27 itojun 1388: syslog(LOG_INFO, "<%s> short option header", __func__);
1389: goto bad;
1390: }
1391:
1.36 roy 1392: hdr = (struct nd_opt_hdr *)((char *)hdr + optlen);
1.1 itojun 1393: if (hdr->nd_opt_len == 0) {
1.30 rpaulo 1394: syslog(LOG_INFO,
1.14 itojun 1395: "<%s> bad ND option length(0) (type = %d)",
1.21 itojun 1396: __func__, hdr->nd_opt_type);
1.1 itojun 1397: goto bad;
1398: }
1.27 itojun 1399: optlen = hdr->nd_opt_len << 3;
1400: if (optlen > limit) {
1401: syslog(LOG_INFO, "<%s> short option", __func__);
1402: goto bad;
1403: }
1.1 itojun 1404:
1.36 roy 1405: if (hdr->nd_opt_type > ND_OPT_MTU &&
1406: hdr->nd_opt_type != ND_OPT_RDNSS &&
1407: hdr->nd_opt_type != ND_OPT_DNSSL)
1.17 itojun 1408: {
1.14 itojun 1409: syslog(LOG_INFO, "<%s> unknown ND option(type %d)",
1.21 itojun 1410: __func__, hdr->nd_opt_type);
1.1 itojun 1411: continue;
1412: }
1413:
1414: if ((ndopt_flags[hdr->nd_opt_type] & optflags) == 0) {
1.14 itojun 1415: syslog(LOG_INFO, "<%s> unexpected ND option(type %d)",
1.21 itojun 1416: __func__, hdr->nd_opt_type);
1.1 itojun 1417: continue;
1418: }
1419:
1.27 itojun 1420: /*
1421: * Option length check. Do it here for all fixed-length
1422: * options.
1423: */
1424: if ((hdr->nd_opt_type == ND_OPT_MTU &&
1425: (optlen != sizeof(struct nd_opt_mtu))) ||
1426: ((hdr->nd_opt_type == ND_OPT_PREFIX_INFORMATION &&
1.42 roy 1427: optlen != sizeof(struct nd_opt_prefix_info))) ||
1428: (hdr->nd_opt_type == ND_OPT_RDNSS &&
1429: ((optlen < (int)sizeof(struct nd_opt_rdnss) ||
1430: (optlen - sizeof(struct nd_opt_rdnss)) % 16 != 0))) ||
1431: (hdr->nd_opt_type == ND_OPT_DNSSL &&
1432: optlen < (int)sizeof(struct nd_opt_dnssl)))
1433: {
1.27 itojun 1434: syslog(LOG_INFO, "<%s> invalid option length",
1435: __func__);
1436: continue;
1437: }
1438:
1.14 itojun 1439: switch (hdr->nd_opt_type) {
1440: case ND_OPT_TARGET_LINKADDR:
1441: case ND_OPT_REDIRECTED_HEADER:
1.42 roy 1442: case ND_OPT_RDNSS:
1443: case ND_OPT_DNSSL:
1.27 itojun 1444: break; /* we don't care about these options */
1.30 rpaulo 1445: case ND_OPT_SOURCE_LINKADDR:
1.14 itojun 1446: case ND_OPT_MTU:
1447: if (ndopts->nd_opt_array[hdr->nd_opt_type]) {
1448: syslog(LOG_INFO,
1449: "<%s> duplicated ND option (type = %d)",
1.21 itojun 1450: __func__, hdr->nd_opt_type);
1.14 itojun 1451: }
1452: ndopts->nd_opt_array[hdr->nd_opt_type] = hdr;
1453: break;
1454: case ND_OPT_PREFIX_INFORMATION:
1455: {
1456: struct nd_optlist *pfxlist;
1457:
1458: if (ndopts->nd_opts_pi == 0) {
1459: ndopts->nd_opts_pi =
1460: (struct nd_opt_prefix_info *)hdr;
1461: continue;
1462: }
1463: if ((pfxlist = malloc(sizeof(*pfxlist))) == NULL) {
1464: syslog(LOG_ERR, "<%s> can't allocate memory",
1.21 itojun 1465: __func__);
1.14 itojun 1466: goto bad;
1467: }
1468: pfxlist->opt = hdr;
1.36 roy 1469: TAILQ_INSERT_TAIL(&ndopts->nd_opts_list, pfxlist, next);
1.14 itojun 1470:
1471: break;
1472: }
1473: default: /* impossible */
1474: break;
1.1 itojun 1475: }
1476: }
1477:
1478: return(0);
1479:
1480: bad:
1481: free_ndopts(ndopts);
1482:
1483: return(-1);
1484: }
1485:
1486: static void
1487: free_ndopts(union nd_opts *ndopts)
1488: {
1.36 roy 1489: struct nd_optlist *opt;
1.1 itojun 1490:
1.36 roy 1491: while ((opt = TAILQ_FIRST(&ndopts->nd_opts_list)) != NULL) {
1492: TAILQ_REMOVE(&ndopts->nd_opts_list, opt, next);
1.1 itojun 1493: free(opt);
1494: }
1495: }
1496:
1497: void
1.36 roy 1498: sock_open(void)
1.1 itojun 1499: {
1500: struct icmp6_filter filt;
1501: struct ipv6_mreq mreq;
1.36 roy 1502: struct rainfo *ra;
1.1 itojun 1503: int on;
1504: /* XXX: should be max MTU attached to the node */
1.36 roy 1505: static unsigned char answer[1500];
1.6 itojun 1506:
1507: rcvcmsgbuflen = CMSG_SPACE(sizeof(struct in6_pktinfo)) +
1508: CMSG_SPACE(sizeof(int));
1.36 roy 1509: rcvcmsgbuf = malloc(rcvcmsgbuflen);
1.6 itojun 1510: if (rcvcmsgbuf == NULL) {
1.49 roy 1511: syslog(LOG_ERR, "<%s> malloc: %m", __func__);
1.6 itojun 1512: exit(1);
1513: }
1514:
1.50 ozaki-r 1515: sndcmsgbuflen = CMSG_SPACE(sizeof(struct in6_pktinfo));
1.36 roy 1516: sndcmsgbuf = malloc(sndcmsgbuflen);
1.6 itojun 1517: if (sndcmsgbuf == NULL) {
1.49 roy 1518: syslog(LOG_ERR, "<%s> malloc: %m", __func__);
1.6 itojun 1519: exit(1);
1520: }
1.1 itojun 1521:
1.51 ozaki-r 1522: if ((sock = prog_socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0) {
1.49 roy 1523: syslog(LOG_ERR, "<%s> socket: %m", __func__);
1.1 itojun 1524: exit(1);
1525: }
1526:
1.48 roy 1527: /* RFC 4861 Section 4.2 */
1528: on = 255;
1.51 ozaki-r 1529: if (prog_setsockopt(sock, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &on,
1.48 roy 1530: sizeof(on)) == -1) {
1531: syslog(LOG_ERR, "<%s> IPV6_MULTICAST_HOPS: %m", __func__);
1532: exit(1);
1533: }
1534:
1.1 itojun 1535: /* specify to tell receiving interface */
1536: on = 1;
1.5 itojun 1537: #ifdef IPV6_RECVPKTINFO
1.51 ozaki-r 1538: if (prog_setsockopt(sock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &on,
1.5 itojun 1539: sizeof(on)) < 0) {
1.49 roy 1540: syslog(LOG_ERR, "<%s> IPV6_RECVPKTINFO: %m", __func__);
1.5 itojun 1541: exit(1);
1542: }
1543: #else /* old adv. API */
1.51 ozaki-r 1544: if (prog_setsockopt(sock, IPPROTO_IPV6, IPV6_PKTINFO, &on,
1.1 itojun 1545: sizeof(on)) < 0) {
1.49 roy 1546: syslog(LOG_ERR, "<%s> IPV6_PKTINFO: %m", __func__);
1.1 itojun 1547: exit(1);
1548: }
1.5 itojun 1549: #endif
1.1 itojun 1550:
1551: on = 1;
1552: /* specify to tell value of hoplimit field of received IP6 hdr */
1.5 itojun 1553: #ifdef IPV6_RECVHOPLIMIT
1.51 ozaki-r 1554: if (prog_setsockopt(sock, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &on,
1.5 itojun 1555: sizeof(on)) < 0) {
1.49 roy 1556: syslog(LOG_ERR, "<%s> IPV6_RECVHOPLIMIT: %m", __func__);
1.5 itojun 1557: exit(1);
1558: }
1559: #else /* old adv. API */
1.51 ozaki-r 1560: if (prog_setsockopt(sock, IPPROTO_IPV6, IPV6_HOPLIMIT, &on,
1.1 itojun 1561: sizeof(on)) < 0) {
1.49 roy 1562: syslog(LOG_ERR, "<%s> IPV6_HOPLIMIT: %m", __func__);
1.1 itojun 1563: exit(1);
1564: }
1.11 itojun 1565: #endif
1.1 itojun 1566:
1567: ICMP6_FILTER_SETBLOCKALL(&filt);
1568: ICMP6_FILTER_SETPASS(ND_ROUTER_SOLICIT, &filt);
1569: ICMP6_FILTER_SETPASS(ND_ROUTER_ADVERT, &filt);
1570: if (accept_rr)
1571: ICMP6_FILTER_SETPASS(ICMP6_ROUTER_RENUMBERING, &filt);
1.51 ozaki-r 1572: if (prog_setsockopt(sock, IPPROTO_ICMPV6, ICMP6_FILTER, &filt,
1.1 itojun 1573: sizeof(filt)) < 0) {
1.49 roy 1574: syslog(LOG_ERR, "<%s> IICMP6_FILTER: %m", __func__);
1.1 itojun 1575: exit(1);
1576: }
1577:
1578: /*
1579: * join all routers multicast address on each advertising interface.
1580: */
1.11 itojun 1581: if (inet_pton(AF_INET6, ALLROUTERS_LINK,
1.36 roy 1582: mreq.ipv6mr_multiaddr.s6_addr) != 1)
1583: {
1.1 itojun 1584: syslog(LOG_ERR, "<%s> inet_pton failed(library bug?)",
1.36 roy 1585: __func__);
1.1 itojun 1586: exit(1);
1587: }
1.36 roy 1588: TAILQ_FOREACH(ra, &ralist, next) {
1.1 itojun 1589: mreq.ipv6mr_interface = ra->ifindex;
1.51 ozaki-r 1590: if (prog_setsockopt(sock, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq,
1.1 itojun 1591: sizeof(mreq)) < 0) {
1.49 roy 1592: syslog(LOG_ERR, "<%s> IPV6_JOIN_GROUP(link) on %s: %m",
1593: __func__, ra->ifname);
1.1 itojun 1594: exit(1);
1595: }
1596: }
1.11 itojun 1597:
1598: /*
1599: * When attending router renumbering, join all-routers site-local
1600: * multicast group.
1601: */
1602: if (accept_rr) {
1603: if (inet_pton(AF_INET6, ALLROUTERS_SITE,
1.36 roy 1604: mreq.ipv6mr_multiaddr.s6_addr) != 1)
1605: {
1.11 itojun 1606: syslog(LOG_ERR, "<%s> inet_pton failed(library bug?)",
1.36 roy 1607: __func__);
1.11 itojun 1608: exit(1);
1609: }
1.36 roy 1610: ra = TAILQ_FIRST(&ralist);
1.11 itojun 1611: if (mcastif) {
1612: if ((mreq.ipv6mr_interface = if_nametoindex(mcastif))
1613: == 0) {
1614: syslog(LOG_ERR,
1615: "<%s> invalid interface: %s",
1.21 itojun 1616: __func__, mcastif);
1.11 itojun 1617: exit(1);
1618: }
1619: } else
1.36 roy 1620: mreq.ipv6mr_interface = ra->ifindex;
1.51 ozaki-r 1621: if (prog_setsockopt(sock, IPPROTO_IPV6, IPV6_JOIN_GROUP,
1.11 itojun 1622: &mreq, sizeof(mreq)) < 0) {
1623: syslog(LOG_ERR,
1.49 roy 1624: "<%s> IPV6_JOIN_GROUP(site) on %s: %m",
1.21 itojun 1625: __func__,
1.49 roy 1626: mcastif ? mcastif : ra->ifname);
1.11 itojun 1627: exit(1);
1628: }
1629: }
1.1 itojun 1630:
1631: /* initialize msghdr for receiving packets */
1.36 roy 1632: rcviov[0].iov_base = answer;
1.1 itojun 1633: rcviov[0].iov_len = sizeof(answer);
1.36 roy 1634: rcvmhdr.msg_name = &rcvfrom;
1.30 rpaulo 1635: rcvmhdr.msg_namelen = sizeof(rcvfrom);
1.1 itojun 1636: rcvmhdr.msg_iov = rcviov;
1637: rcvmhdr.msg_iovlen = 1;
1.36 roy 1638: rcvmhdr.msg_control = rcvcmsgbuf;
1.6 itojun 1639: rcvmhdr.msg_controllen = rcvcmsgbuflen;
1.1 itojun 1640:
1641: /* initialize msghdr for sending packets */
1642: sndmhdr.msg_namelen = sizeof(struct sockaddr_in6);
1643: sndmhdr.msg_iov = sndiov;
1644: sndmhdr.msg_iovlen = 1;
1.36 roy 1645: sndmhdr.msg_control = (void *)sndcmsgbuf;
1.6 itojun 1646: sndmhdr.msg_controllen = sndcmsgbuflen;
1.1 itojun 1647:
1648: return;
1649: }
1650:
1651: /* open a routing socket to watch the routing table */
1652: static void
1.36 roy 1653: rtsock_open(void)
1.1 itojun 1654: {
1.53 ! roy 1655: #ifdef RO_MSGFILTER
! 1656: unsigned char msgfilter[] = {
! 1657: RTM_ADD, RTM_DELETE,
! 1658: RTM_NEWADDR, RTM_DELADDR,
! 1659: #ifdef RTM_IFANNOUNCE
! 1660: RTM_IFANNOUNCE,
! 1661: #endif
! 1662: RTM_IFINFO,
! 1663: };
! 1664: #endif
! 1665:
1.51 ozaki-r 1666: if ((rtsock = prog_socket(PF_ROUTE, SOCK_RAW, 0)) < 0) {
1.49 roy 1667: syslog(LOG_ERR, "<%s> socket: %m", __func__);
1.1 itojun 1668: exit(1);
1669: }
1.53 ! roy 1670: #ifdef RO_MSGFILTER
! 1671: if (setsockopt(rtsock, PF_ROUTE, RO_MSGFILTER,
! 1672: &msgfilter, sizeof(msgfilter) == -1))
! 1673: syslog(LOG_ERR, "<%s> RO_MSGFILTER: %m", __func__);
! 1674: #endif
1.1 itojun 1675: }
1676:
1.11 itojun 1677: struct rainfo *
1.36 roy 1678: if_indextorainfo(unsigned int idx)
1.1 itojun 1679: {
1.36 roy 1680: struct rainfo *rai;
1.1 itojun 1681:
1.36 roy 1682: TAILQ_FOREACH(rai, &ralist, next) {
1.35 lukem 1683: if (rai->ifindex == idx)
1.1 itojun 1684: return(rai);
1685: }
1686:
1687: return(NULL); /* search failed */
1688: }
1689:
1.39 roy 1690: struct rainfo *
1691: ra_output(struct rainfo *rai)
1.1 itojun 1692: {
1693: int i;
1694: struct cmsghdr *cm;
1695: struct in6_pktinfo *pi;
1.36 roy 1696: struct soliciter *sol;
1.10 itojun 1697:
1.39 roy 1698: if ((rai->ifflags & IFF_UP) == 0) {
1.10 itojun 1699: syslog(LOG_DEBUG, "<%s> %s is not up, skip sending RA",
1.39 roy 1700: __func__, rai->ifname);
1701: return NULL;
1.10 itojun 1702: }
1.1 itojun 1703:
1.39 roy 1704: make_packet(rai); /* XXX: inefficient */
1.11 itojun 1705:
1.36 roy 1706: sndmhdr.msg_name = (void *)&sin6_linklocal_allnodes;
1.39 roy 1707: sndmhdr.msg_iov[0].iov_base = (void *)rai->ra_data;
1708: sndmhdr.msg_iov[0].iov_len = rai->ra_datalen;
1.1 itojun 1709:
1710: cm = CMSG_FIRSTHDR(&sndmhdr);
1711: /* specify the outgoing interface */
1712: cm->cmsg_level = IPPROTO_IPV6;
1713: cm->cmsg_type = IPV6_PKTINFO;
1714: cm->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
1715: pi = (struct in6_pktinfo *)CMSG_DATA(cm);
1716: memset(&pi->ipi6_addr, 0, sizeof(pi->ipi6_addr)); /*XXX*/
1.39 roy 1717: pi->ipi6_ifindex = rai->ifindex;
1.1 itojun 1718:
1719: syslog(LOG_DEBUG,
1720: "<%s> send RA on %s, # of waitings = %d",
1.39 roy 1721: __func__, rai->ifname, rai->waiting);
1.1 itojun 1722:
1.51 ozaki-r 1723: i = prog_sendmsg(sock, &sndmhdr, 0);
1.1 itojun 1724:
1.39 roy 1725: if (i < 0 || (size_t)i != rai->ra_datalen) {
1.1 itojun 1726: if (i < 0) {
1.49 roy 1727: syslog(LOG_ERR, "<%s> sendmsg on %s: %m",
1728: __func__, rai->ifname);
1.1 itojun 1729: }
1730: }
1731:
1.10 itojun 1732: /*
1733: * unicast advertisements
1734: * XXX commented out. reason: though spec does not forbit it, unicast
1735: * advert does not really help
1736: */
1.39 roy 1737: while ((sol = TAILQ_FIRST(&rai->soliciter)) != NULL) {
1.10 itojun 1738: #if 0
1.36 roy 1739: sndmhdr.msg_name = (void *)&sol->addr;
1.10 itojun 1740: i = sendmsg(sock, &sndmhdr, 0);
1.39 roy 1741: if (i < 0 || i != rai->ra_datalen) {
1.10 itojun 1742: if (i < 0) {
1743: syslog(LOG_ERR,
1.49 roy 1744: "<%s> unicast sendmsg on %s: %m",
1745: __func__, rai->ifname);
1.10 itojun 1746: }
1747: }
1748: #endif
1.39 roy 1749: TAILQ_REMOVE(&rai->soliciter, sol, next);
1.10 itojun 1750: free(sol);
1751: }
1752:
1.39 roy 1753: if (rai->leaving_adv > 0) {
1754: if (--(rai->leaving_adv) == 0) {
1.41 roy 1755: /* leaving for ourself means we're shutting down */
1756: if (rai->leaving_for == rai) {
1757: TAILQ_REMOVE(&ralist, rai, next);
1758: free_rainfo(rai);
1759: return NULL;
1760: }
1.39 roy 1761: syslog(LOG_DEBUG,
1762: "<%s> expired RA,"
1763: " new config active for interface (%s)",
1764: __func__, rai->ifname);
1765: rai->leaving_for->timer = rtadvd_add_timer(ra_timeout,
1766: ra_timer_update,
1767: rai->leaving_for, rai->leaving_for);
1768: ra_timer_set_short_delay(rai->leaving_for);
1769: rai->leaving_for->leaving = NULL;
1770: free_rainfo(rai);
1771: return NULL;
1772: }
1773: }
1774:
1.1 itojun 1775: /* update counter */
1.39 roy 1776: if (rai->initcounter < MAX_INITIAL_RTR_ADVERTISEMENTS)
1777: rai->initcounter++;
1778: rai->raoutput++;
1.1 itojun 1779:
1780: /* update timestamp */
1.51 ozaki-r 1781: prog_clock_gettime(CLOCK_MONOTONIC, &rai->lastsent);
1.1 itojun 1782:
1783: /* reset waiting conter */
1.39 roy 1784: rai->waiting = 0;
1785:
1786: return rai;
1.1 itojun 1787: }
1788:
1789: /* process RA timer */
1.30 rpaulo 1790: struct rtadvd_timer *
1.1 itojun 1791: ra_timeout(void *data)
1792: {
1793: struct rainfo *rai = (struct rainfo *)data;
1794:
1795: #ifdef notyet
1796: /* if necessary, reconstruct the packet. */
1797: #endif
1798:
1799: syslog(LOG_DEBUG,
1800: "<%s> RA timer on %s is expired",
1.21 itojun 1801: __func__, rai->ifname);
1.1 itojun 1802:
1.39 roy 1803: if (ra_output(rai))
1804: return(rai->timer);
1805: return NULL;
1.1 itojun 1806: }
1807:
1808: /* update RA timer */
1809: void
1.47 roy 1810: ra_timer_update(void *data, struct timespec *tm)
1.1 itojun 1811: {
1812: struct rainfo *rai = (struct rainfo *)data;
1813: long interval;
1814:
1815: /*
1816: * Whenever a multicast advertisement is sent from an interface,
1817: * the timer is reset to a uniformly-distributed random value
1818: * between the interface's configured MinRtrAdvInterval and
1.11 itojun 1819: * MaxRtrAdvInterval (RFC2461 6.2.4).
1.1 itojun 1820: */
1.39 roy 1821: interval = rai->mininterval;
1822: if (rai->mininterval != rai->maxinterval)
1823: interval += arc4random() % (rai->maxinterval-rai->mininterval);
1.1 itojun 1824:
1825: /*
1826: * For the first few advertisements (up to
1827: * MAX_INITIAL_RTR_ADVERTISEMENTS), if the randomly chosen interval
1828: * is greater than MAX_INITIAL_RTR_ADVERT_INTERVAL, the timer
1829: * SHOULD be set to MAX_INITIAL_RTR_ADVERT_INTERVAL instead.
1830: * (RFC-2461 6.2.4)
1831: */
1832: if (rai->initcounter < MAX_INITIAL_RTR_ADVERTISEMENTS &&
1833: interval > MAX_INITIAL_RTR_ADVERT_INTERVAL)
1834: interval = MAX_INITIAL_RTR_ADVERT_INTERVAL;
1835:
1836: tm->tv_sec = interval;
1.47 roy 1837: tm->tv_nsec = 0;
1.1 itojun 1838:
1839: syslog(LOG_DEBUG,
1840: "<%s> RA timer on %s is set to %ld:%ld",
1.21 itojun 1841: __func__, rai->ifname,
1.47 roy 1842: (long int)tm->tv_sec, (long int)tm->tv_nsec);
1.1 itojun 1843:
1844: return;
1845: }
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