Annotation of src/usr.sbin/rtadvd/rtadvd.c, Revision 1.68
1.68 ! christos 1: /* $NetBSD: rtadvd.c,v 1.67 2019/01/11 20:41:53 christos 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.
1.61 roy 7: *
1.1 itojun 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.
1.61 roy 19: *
1.1 itojun 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>
1.57 christos 57: #include <stdarg.h>
1.39 roy 58: #ifdef __NetBSD__
1.17 itojun 59: #include <util.h>
1.39 roy 60: #endif
1.25 itojun 61: #include <poll.h>
1.44 roy 62: #include <pwd.h>
1.17 itojun 63:
1.1 itojun 64: #include "rtadvd.h"
65: #include "rrenum.h"
66: #include "advcap.h"
67: #include "timer.h"
68: #include "if.h"
69: #include "config.h"
1.9 itojun 70: #include "dump.h"
1.57 christos 71: #include "logit.h"
1.51 ozaki-r 72: #include "prog_ops.h"
1.67 christos 73: #include "expandm.h"
1.1 itojun 74:
75: struct msghdr rcvmhdr;
1.36 roy 76: static unsigned char *rcvcmsgbuf;
1.6 itojun 77: static size_t rcvcmsgbuflen;
1.39 roy 78: static unsigned char *sndcmsgbuf;
1.6 itojun 79: static size_t sndcmsgbuflen;
1.18 itojun 80: volatile sig_atomic_t do_dump;
1.39 roy 81: volatile sig_atomic_t do_reconf;
1.18 itojun 82: volatile sig_atomic_t do_die;
1.1 itojun 83: struct msghdr sndmhdr;
84: struct iovec rcviov[2];
85: struct iovec sndiov[2];
1.30 rpaulo 86: struct sockaddr_in6 rcvfrom;
1.36 roy 87: static const char *dumpfilename = "/var/run/rtadvd.dump"; /* XXX configurable */
1.11 itojun 88: static char *mcastif;
1.12 itojun 89: int sock;
90: int rtsock = -1;
1.5 itojun 91: int accept_rr = 0;
1.57 christos 92: int dflag = 0, sflag = 0, Dflag;
1.1 itojun 93:
1.39 roy 94: static char **if_argv;
95: static int if_argc;
96:
1.31 mrg 97: char *conffile = NULL;
1.1 itojun 98:
1.36 roy 99: struct ralist_head_t ralist = TAILQ_HEAD_INITIALIZER(ralist);
100:
1.1 itojun 101: struct nd_optlist {
1.36 roy 102: TAILQ_ENTRY(nd_optlist) next;
1.1 itojun 103: struct nd_opt_hdr *opt;
104: };
105: union nd_opts {
1.18 itojun 106: struct nd_opt_hdr *nd_opt_array[9];
1.1 itojun 107: struct {
108: struct nd_opt_hdr *zero;
109: struct nd_opt_hdr *src_lladdr;
110: struct nd_opt_hdr *tgt_lladdr;
111: struct nd_opt_prefix_info *pi;
112: struct nd_opt_rd_hdr *rh;
113: struct nd_opt_mtu *mtu;
1.36 roy 114: TAILQ_HEAD(, nd_optlist) list;
1.1 itojun 115: } nd_opt_each;
116: };
117: #define nd_opts_src_lladdr nd_opt_each.src_lladdr
118: #define nd_opts_tgt_lladdr nd_opt_each.tgt_lladdr
119: #define nd_opts_pi nd_opt_each.pi
120: #define nd_opts_rh nd_opt_each.rh
121: #define nd_opts_mtu nd_opt_each.mtu
122: #define nd_opts_list nd_opt_each.list
123:
1.36 roy 124: #define NDOPT_FLAG_SRCLINKADDR (1 << 0)
125: #define NDOPT_FLAG_TGTLINKADDR (1 << 1)
126: #define NDOPT_FLAG_PREFIXINFO (1 << 2)
127: #define NDOPT_FLAG_RDHDR (1 << 3)
128: #define NDOPT_FLAG_MTU (1 << 4)
129: #define NDOPT_FLAG_RDNSS (1 << 5)
130: #define NDOPT_FLAG_DNSSL (1 << 6)
131:
132: uint32_t ndopt_flags[] = {
133: [ND_OPT_SOURCE_LINKADDR] = NDOPT_FLAG_SRCLINKADDR,
134: [ND_OPT_TARGET_LINKADDR] = NDOPT_FLAG_TGTLINKADDR,
135: [ND_OPT_PREFIX_INFORMATION] = NDOPT_FLAG_PREFIXINFO,
136: [ND_OPT_REDIRECTED_HEADER] = NDOPT_FLAG_RDHDR,
137: [ND_OPT_MTU] = NDOPT_FLAG_MTU,
138: [ND_OPT_RDNSS] = NDOPT_FLAG_RDNSS,
139: [ND_OPT_DNSSL] = NDOPT_FLAG_DNSSL,
140: };
141:
142: struct sockaddr_in6 sin6_linklocal_allnodes = {
143: .sin6_len = sizeof(sin6_linklocal_allnodes),
144: .sin6_family = AF_INET6,
145: .sin6_addr = IN6ADDR_LINKLOCAL_ALLNODES_INIT,
146: };
1.38 christos 147: #ifdef notdef
1.36 roy 148: struct sockaddr_in6 sin6_linklocal_allrouters = {
149: .sin6_len = sizeof(sin6_linklocal_allrouters),
150: .sin6_family = AF_INET6,
151: .sin6_addr = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT,
152: };
1.38 christos 153: #endif
1.36 roy 154: struct sockaddr_in6 sin6_sitelocal_allrouters = {
155: .sin6_len = sizeof(sin6_sitelocal_allrouters),
156: .sin6_family = AF_INET6,
157: .sin6_addr = IN6ADDR_SITELOCAL_ALLROUTERS_INIT,
1.1 itojun 158: };
159:
1.36 roy 160: static void set_die(int);
1.41 roy 161: static void die(void);
1.39 roy 162: static void set_reconf(int);
1.36 roy 163: static void sock_open(void);
164: static void rtsock_open(void);
165: static void rtadvd_input(void);
166: static void rs_input(int, struct nd_router_solicit *,
167: struct in6_pktinfo *, struct sockaddr_in6 *);
168: static void ra_input(int, struct nd_router_advert *,
169: struct in6_pktinfo *, struct sockaddr_in6 *);
1.65 roy 170: static struct rainfo *ra_output(struct rainfo *, bool);
1.36 roy 171: static int prefix_check(struct nd_opt_prefix_info *, struct rainfo *,
172: struct sockaddr_in6 *);
173: static int nd6_options(struct nd_opt_hdr *, int, union nd_opts *, uint32_t);
174: static void free_ndopts(union nd_opts *);
175: static void rtmsg_input(void);
176: static void rtadvd_set_dump_file(int);
1.1 itojun 177:
178: int
1.36 roy 179: main(int argc, char *argv[])
1.1 itojun 180: {
1.23 mycroft 181: struct pollfd set[2];
1.47 roy 182: struct timespec *timeout;
1.1 itojun 183: int i, ch;
1.14 itojun 184: int fflag = 0, logopt;
1.44 roy 185: struct passwd *pw;
1.52 ozaki-r 186: const char *pidfilepath = NULL;
1.63 roy 187: pid_t pid;
1.1 itojun 188:
189: /* get command line options and arguments */
1.52 ozaki-r 190: #define OPTIONS "c:dDfM:p:Rs"
1.7 itojun 191: while ((ch = getopt(argc, argv, OPTIONS)) != -1) {
192: #undef OPTIONS
1.14 itojun 193: switch (ch) {
194: case 'c':
195: conffile = optarg;
196: break;
197: case 'd':
1.57 christos 198: dflag++;
1.14 itojun 199: break;
200: case 'D':
1.57 christos 201: Dflag++;
1.14 itojun 202: break;
203: case 'f':
204: fflag = 1;
205: break;
1.11 itojun 206: case 'M':
207: mcastif = optarg;
208: break;
1.52 ozaki-r 209: case 'p':
210: pidfilepath = optarg;
211: break;
1.14 itojun 212: case 'R':
213: fprintf(stderr, "rtadvd: "
214: "the -R option is currently ignored.\n");
215: /* accept_rr = 1; */
216: /* run anyway... */
217: break;
218: case 's':
219: sflag = 1;
220: break;
1.1 itojun 221: }
222: }
223: argc -= optind;
224: argv += optind;
225: if (argc == 0) {
1.54 christos 226: fprintf(stderr, "Ysage: %s [-DdfRs] [-c conffile]"
227: " [-M ifname] [-p pidfile] interface ...\n", getprogname());
228: return EXIT_FAILURE;
1.1 itojun 229: }
230:
1.63 roy 231: if ((pid = pidfile_lock(pidfilepath)) != 0) {
232: if (pid == -1)
233: logit(LOG_ERR, "pidfile_lock: %m");
234: /* Continue */
235: else {
236: logit(LOG_ERR, "Another instance of `%s' is running "
237: "(pid %d); exiting.", getprogname(), pid);
238: return EXIT_FAILURE;
239: }
240: }
241:
242: if (prog_init && prog_init() == -1)
1.54 christos 243: err(EXIT_FAILURE, "init failed");
1.51 ozaki-r 244:
1.14 itojun 245: logopt = LOG_NDELAY | LOG_PID;
246: if (fflag)
247: logopt |= LOG_PERROR;
248: openlog("rtadvd", logopt, LOG_DAEMON);
249:
1.1 itojun 250: /* set log level */
251: if (dflag == 0)
252: (void)setlogmask(LOG_UPTO(LOG_ERR));
253: if (dflag == 1)
254: (void)setlogmask(LOG_UPTO(LOG_INFO));
255:
1.44 roy 256: errno = 0; /* Ensure errno is 0 so we know if getpwnam errors or not */
257: if ((pw = getpwnam(RTADVD_USER)) == NULL) {
258: if (errno == 0)
1.57 christos 259: logit(LOG_ERR,
1.44 roy 260: "user %s does not exist, aborting",
261: RTADVD_USER);
262: else
1.57 christos 263: logit(LOG_ERR, "getpwnam: %s: %m", RTADVD_USER);
1.54 christos 264: return EXIT_FAILURE;
1.44 roy 265: }
266:
1.1 itojun 267: /* timer initialization */
268: rtadvd_timer_init();
269:
1.39 roy 270: if_argc = argc;
271: if_argv = argv;
1.1 itojun 272: while (argc--)
1.39 roy 273: getconfig(*argv++, 1);
1.1 itojun 274:
1.63 roy 275: if (!fflag) {
1.51 ozaki-r 276: prog_daemon(1, 0);
1.63 roy 277: if (pidfile_lock(pidfilepath) != 0)
278: logit(LOG_ERR, " pidfile_lock: %m");
279: }
1.13 itojun 280:
281: sock_open();
1.1 itojun 282:
1.23 mycroft 283: set[0].fd = sock;
284: set[0].events = POLLIN;
1.12 itojun 285: if (sflag == 0) {
286: rtsock_open();
1.23 mycroft 287: set[1].fd = rtsock;
288: set[1].events = POLLIN;
1.12 itojun 289: } else
1.24 mycroft 290: set[1].fd = -1;
1.19 itojun 291:
1.57 christos 292: logit(LOG_INFO, "dropping privileges to %s", RTADVD_USER);
1.51 ozaki-r 293: if (prog_chroot(pw->pw_dir) == -1) {
1.57 christos 294: logit(LOG_ERR, "chroot: %s: %m", pw->pw_dir);
1.54 christos 295: return EXIT_FAILURE;
1.44 roy 296: }
1.51 ozaki-r 297: if (prog_chdir("/") == -1) {
1.57 christos 298: logit(LOG_ERR, "chdir: /: %m");
1.54 christos 299: return EXIT_FAILURE;
1.44 roy 300: }
1.51 ozaki-r 301: if (prog_setgroups(1, &pw->pw_gid) == -1 ||
302: prog_setgid(pw->pw_gid) == -1 ||
303: prog_setuid(pw->pw_uid) == -1)
1.44 roy 304: {
1.57 christos 305: logit(LOG_ERR, "failed to drop privileges: %m");
1.54 christos 306: return EXIT_FAILURE;
1.44 roy 307: }
308:
1.41 roy 309: signal(SIGINT, set_die);
1.22 itojun 310: signal(SIGTERM, set_die);
1.39 roy 311: signal(SIGHUP, set_reconf);
1.22 itojun 312: signal(SIGUSR1, rtadvd_set_dump_file);
1.5 itojun 313:
1.23 mycroft 314: for (;;) {
1.9 itojun 315: if (do_dump) { /* SIGUSR1 */
316: do_dump = 0;
317: rtadvd_dump_file(dumpfilename);
318: }
319:
1.39 roy 320: if (do_reconf) { /* SIGHUP */
321: do_reconf = 0;
1.57 christos 322: logit(LOG_INFO, "%s: reloading config on SIGHUP",
1.39 roy 323: __func__);
324: argc = if_argc;
325: argv = if_argv;
326: while (argc--)
327: getconfig(*argv++, 0);
328: }
329:
1.47 roy 330: /* timer expiration check and reset the timer */
331: timeout = rtadvd_check_timer();
332:
1.11 itojun 333: if (do_die) {
334: die();
335: /*NOTREACHED*/
336: }
337:
1.10 itojun 338: if (timeout != NULL) {
1.57 christos 339: logit(LOG_DEBUG,
1.56 christos 340: "%s: set timer to %jd:%jd. waiting for "
1.21 itojun 341: "inputs or timeout", __func__,
1.54 christos 342: (intmax_t)timeout->tv_sec,
343: (intmax_t)timeout->tv_nsec);
1.10 itojun 344: } else {
1.57 christos 345: logit(LOG_DEBUG,
1.56 christos 346: "%s: there's no timer. waiting for inputs",
1.21 itojun 347: __func__);
1.10 itojun 348: }
1.1 itojun 349:
1.51 ozaki-r 350: if ((i = prog_poll(set, 2, timeout ? (timeout->tv_sec * 1000 +
1.56 christos 351: (timeout->tv_nsec + 999999) / 1000000) : INFTIM)) == -1)
1.47 roy 352: {
1.9 itojun 353: /* EINTR would occur upon SIGUSR1 for status dump */
1.57 christos 354: if (errno == EINTR)
355: continue;
356:
357: logit(LOG_ERR, "%s: poll: %m", __func__);
358: if (Dflag)
359: exit(1);
1.1 itojun 360: }
361: if (i == 0) /* timeout */
362: continue;
1.23 mycroft 363: if (rtsock != -1 && set[1].revents & POLLIN)
1.1 itojun 364: rtmsg_input();
1.23 mycroft 365: if (set[0].revents & POLLIN)
1.1 itojun 366: rtadvd_input();
367: }
1.54 christos 368: return EXIT_SUCCESS; /* NOTREACHED */
1.1 itojun 369: }
370:
371: static void
1.39 roy 372: rtadvd_set_dump_file(__unused int sig)
1.9 itojun 373: {
1.39 roy 374:
1.9 itojun 375: do_dump = 1;
376: }
377:
378: static void
1.39 roy 379: set_reconf(__unused int sig)
1.5 itojun 380: {
1.39 roy 381:
382: do_reconf = 1;
383: }
384:
385: static void
386: set_die(__unused int sig)
387: {
388:
1.11 itojun 389: do_die = 1;
390: }
391:
392: static void
1.36 roy 393: die(void)
1.11 itojun 394: {
1.41 roy 395: static int waiting;
396: struct rainfo *rai, *ran;
1.39 roy 397: struct rdnss *rdnss;
398: struct dnssl *dnssl;
1.5 itojun 399:
1.41 roy 400: if (waiting) {
401: if (TAILQ_FIRST(&ralist)) {
1.57 christos 402: logit(LOG_INFO,
1.56 christos 403: "%s: waiting for expiration of all RA timers",
1.41 roy 404: __func__);
405: return;
406: }
1.57 christos 407: logit(LOG_NOTICE, "%s: gracefully terminated", __func__);
1.41 roy 408: free(rcvcmsgbuf);
409: free(sndcmsgbuf);
1.54 christos 410: exit(EXIT_SUCCESS);
1.41 roy 411: /* NOT REACHED */
412: }
413:
1.43 roy 414: if (TAILQ_FIRST(&ralist) == NULL) {
1.57 christos 415: logit(LOG_NOTICE, "%s: gracefully terminated", __func__);
1.54 christos 416: exit(EXIT_SUCCESS);
1.43 roy 417: /* NOT REACHED */
418: }
419:
1.41 roy 420: waiting = 1;
1.57 christos 421: logit(LOG_NOTICE, "%s: final RA transmission started", __func__);
1.41 roy 422:
423: TAILQ_FOREACH_SAFE(rai, &ralist, next, ran) {
424: if (rai->leaving) {
425: TAILQ_REMOVE(&ralist, rai, next);
426: TAILQ_INSERT_HEAD(&ralist, rai->leaving, next);
427: rai->leaving->leaving = rai->leaving;
428: rai->leaving->leaving_for = rai->leaving;
429: free_rainfo(rai);
430: continue;
431: }
1.39 roy 432: rai->lifetime = 0;
433: TAILQ_FOREACH(rdnss, &rai->rdnss, next)
434: rdnss->lifetime = 0;
435: TAILQ_FOREACH(dnssl, &rai->dnssl, next)
436: dnssl->lifetime = 0;
437: make_packet(rai);
1.41 roy 438: rai->leaving = rai;
439: rai->leaving_for = rai;
440: rai->initcounter = MAX_INITIAL_RTR_ADVERTISEMENTS;
441: rai->mininterval = MIN_DELAY_BETWEEN_RAS;
442: rai->maxinterval = MIN_DELAY_BETWEEN_RAS;
443: rai->leaving_adv = MAX_FINAL_RTR_ADVERTISEMENTS;
1.65 roy 444: ra_output(rai, false);
1.54 christos 445: ra_timer_update(rai, &rai->timer->tm);
1.41 roy 446: rtadvd_set_timer(&rai->timer->tm, rai->timer);
1.5 itojun 447: }
448: }
449:
450: static void
1.36 roy 451: rtmsg_input(void)
1.1 itojun 452: {
1.9 itojun 453: int n, type, ifindex = 0, plen;
1.2 itojun 454: size_t len;
1.32 tron 455: union rt_msghdr_buf {
456: struct rt_msghdr rt_msghdr;
457: char data[2048];
458: } buffer;
1.39 roy 459: char *msg, *next, *lim, **argv;
1.31 mrg 460: char ifname[IF_NAMESIZE];
1.1 itojun 461: struct prefix *prefix;
462: struct rainfo *rai;
463: struct in6_addr *addr;
464: char addrbuf[INET6_ADDRSTRLEN];
1.39 roy 465: int prefixchange = 0, argc;
1.1 itojun 466:
1.39 roy 467: memset(&buffer, 0, sizeof(buffer));
1.51 ozaki-r 468: n = prog_read(rtsock, &buffer, sizeof(buffer));
1.41 roy 469:
470: /* We read the buffer first to clear the FD */
471: if (do_die)
472: return;
473:
1.32 tron 474: msg = buffer.data;
1.1 itojun 475: if (dflag > 1) {
1.57 christos 476: logit(LOG_DEBUG, "%s: received a routing message "
1.39 roy 477: "(type = %d, len = %d)", __func__, rtmsg_type(msg),
478: rtmsg_len(msg));
1.1 itojun 479: }
480: if (n > rtmsg_len(msg)) {
481: /*
482: * This usually won't happen for messages received on
1.10 itojun 483: * a routing socket.
1.1 itojun 484: */
485: if (dflag > 1)
1.57 christos 486: logit(LOG_DEBUG,
1.56 christos 487: "%s: received data length is larger than "
1.14 itojun 488: "1st routing message len. multiple messages? "
489: "read %d bytes, but 1st msg len = %d",
1.21 itojun 490: __func__, n, rtmsg_len(msg));
1.1 itojun 491: #if 0
492: /* adjust length */
493: n = rtmsg_len(msg);
494: #endif
495: }
496:
497: lim = msg + n;
498: for (next = msg; next < lim; next += len) {
1.10 itojun 499: int oldifflags;
500:
1.1 itojun 501: next = get_next_msg(next, lim, 0, &len,
502: RTADV_TYPE2BITMASK(RTM_ADD) |
503: RTADV_TYPE2BITMASK(RTM_DELETE) |
504: RTADV_TYPE2BITMASK(RTM_NEWADDR) |
505: RTADV_TYPE2BITMASK(RTM_DELADDR) |
1.39 roy 506: #ifdef RTM_IFANNOUNCE
507: RTADV_TYPE2BITMASK(RTM_IFANNOUNCE) |
508: #endif
1.1 itojun 509: RTADV_TYPE2BITMASK(RTM_IFINFO));
510: if (len == 0)
511: break;
512: type = rtmsg_type(next);
513: switch (type) {
514: case RTM_ADD:
515: case RTM_DELETE:
516: ifindex = get_rtm_ifindex(next);
517: break;
518: case RTM_NEWADDR:
519: case RTM_DELADDR:
520: ifindex = get_ifam_ifindex(next);
521: break;
1.39 roy 522: #ifdef RTM_IFANNOUNCE
523: case RTM_IFANNOUNCE:
524: ifindex = get_ifan_ifindex(next);
525: if (get_ifan_what(next) == IFAN_ARRIVAL) {
1.57 christos 526: logit(LOG_DEBUG,
1.61 roy 527: "%s: interface %s arrived",
1.39 roy 528: __func__,
529: if_indextoname(ifindex, ifname));
530: if (if_argc == 0) {
531: getconfig(ifname, 0);
532: continue;
533: }
534: argc = if_argc;
535: argv = if_argv;
536: while (argc--) {
537: if (strcmp(ifname, *argv++) == 0) {
538: getconfig(ifname, 0);
539: break;
540: }
541: }
542: continue;
543: }
544: break;
545: #endif
1.1 itojun 546: case RTM_IFINFO:
547: ifindex = get_ifm_ifindex(next);
548: break;
549: default:
550: /* should not reach here */
551: if (dflag > 1) {
1.57 christos 552: logit(LOG_DEBUG, "%s: unknown rtmsg %d on %s",
1.56 christos 553: __func__, type,
1.1 itojun 554: if_indextoname(ifindex, ifname));
555: }
1.10 itojun 556: continue;
1.1 itojun 557: }
558:
559: if ((rai = if_indextorainfo(ifindex)) == NULL) {
560: if (dflag > 1) {
1.57 christos 561: logit(LOG_DEBUG,
1.56 christos 562: "%s: route changed on "
1.39 roy 563: "non advertising interface %s (%d)",
1.21 itojun 564: __func__,
1.39 roy 565: if_indextoname(ifindex, ifname),
566: ifindex);
1.1 itojun 567: }
1.10 itojun 568: continue;
1.1 itojun 569: }
1.39 roy 570: oldifflags = rai->ifflags;
1.1 itojun 571:
1.14 itojun 572: switch (type) {
573: case RTM_ADD:
574: /* init ifflags because it may have changed */
1.39 roy 575: rai->ifflags = if_getflags(ifindex, rai->ifflags);
1.14 itojun 576:
577: if (sflag)
578: break; /* we aren't interested in prefixes */
579:
580: addr = get_addr(msg);
581: plen = get_prefixlen(msg);
582: /* sanity check for plen */
583: /* as RFC2373, prefixlen is at least 4 */
584: if (plen < 4 || plen > 127) {
1.57 christos 585: logit(LOG_INFO, "%s: new interface route's"
1.14 itojun 586: "plen %d is invalid for a prefix",
1.21 itojun 587: __func__, plen);
1.14 itojun 588: break;
589: }
590: prefix = find_prefix(rai, addr, plen);
591: if (prefix) {
1.30 rpaulo 592: if (prefix->timer) {
593: /*
594: * If the prefix has been invalidated,
595: * make it available again.
596: */
597: update_prefix(prefix);
598: prefixchange = 1;
599: } else if (dflag > 1) {
1.57 christos 600: logit(LOG_DEBUG,
1.56 christos 601: "%s: new prefix(%s/%d) "
1.14 itojun 602: "added on %s, "
603: "but it was already in list",
1.21 itojun 604: __func__,
1.14 itojun 605: inet_ntop(AF_INET6, addr,
606: (char *)addrbuf, INET6_ADDRSTRLEN),
607: plen, rai->ifname);
608: }
1.10 itojun 609: break;
1.14 itojun 610: }
611: make_prefix(rai, ifindex, addr, plen);
1.30 rpaulo 612: prefixchange = 1;
1.14 itojun 613: break;
614: case RTM_DELETE:
615: /* init ifflags because it may have changed */
1.39 roy 616: rai->ifflags = if_getflags(ifindex, rai->ifflags);
1.14 itojun 617:
618: if (sflag)
1.10 itojun 619: break;
1.14 itojun 620:
621: addr = get_addr(msg);
622: plen = get_prefixlen(msg);
623: /* sanity check for plen */
624: /* as RFC2373, prefixlen is at least 4 */
625: if (plen < 4 || plen > 127) {
1.57 christos 626: logit(LOG_INFO,
1.56 christos 627: "%s: deleted interface route's "
1.14 itojun 628: "plen %d is invalid for a prefix",
1.21 itojun 629: __func__, plen);
1.14 itojun 630: break;
631: }
632: prefix = find_prefix(rai, addr, plen);
633: if (prefix == NULL) {
634: if (dflag > 1) {
1.57 christos 635: logit(LOG_DEBUG,
1.56 christos 636: "%s: prefix(%s/%d) was "
1.14 itojun 637: "deleted on %s, "
638: "but it was not in list",
1.21 itojun 639: __func__,
1.14 itojun 640: inet_ntop(AF_INET6, addr,
641: (char *)addrbuf, INET6_ADDRSTRLEN),
642: plen, rai->ifname);
643: }
644: break;
645: }
1.30 rpaulo 646: invalidate_prefix(prefix);
647: prefixchange = 1;
1.14 itojun 648: break;
1.1 itojun 649: case RTM_NEWADDR:
650: case RTM_DELADDR:
1.14 itojun 651: /* init ifflags because it may have changed */
1.39 roy 652: rai->ifflags = if_getflags(ifindex, rai->ifflags);
1.14 itojun 653: break;
1.1 itojun 654: case RTM_IFINFO:
1.39 roy 655: rai->ifflags = get_ifm_flags(next);
1.14 itojun 656: break;
1.39 roy 657: #ifdef RTM_IFANNOUNCE
658: case RTM_IFANNOUNCE:
659: if (get_ifan_what(next) == IFAN_DEPARTURE) {
1.57 christos 660: logit(LOG_DEBUG,
1.61 roy 661: "%s: interface %s departed",
1.39 roy 662: __func__, rai->ifname);
663: TAILQ_REMOVE(&ralist, rai, next);
664: if (rai->leaving)
665: free_rainfo(rai->leaving);
666: free_rainfo(rai);
667: continue;
668: }
669: break;
670: #endif
1.1 itojun 671: default:
672: /* should not reach here */
673: if (dflag > 1) {
1.57 christos 674: logit(LOG_DEBUG,
1.56 christos 675: "%s: unknown rtmsg %d on %s",
676: __func__, type,
1.14 itojun 677: if_indextoname(ifindex, ifname));
1.1 itojun 678: }
679: return;
680: }
1.10 itojun 681:
682: /* check if an interface flag is changed */
683: if ((oldifflags & IFF_UP) != 0 && /* UP to DOWN */
1.39 roy 684: (rai->ifflags & IFF_UP) == 0) {
1.57 christos 685: logit(LOG_INFO,
1.56 christos 686: "%s: interface %s becomes down. stop timer.",
1.21 itojun 687: __func__, rai->ifname);
1.10 itojun 688: rtadvd_remove_timer(&rai->timer);
1.18 itojun 689: } else if ((oldifflags & IFF_UP) == 0 && /* DOWN to UP */
1.39 roy 690: (rai->ifflags & IFF_UP) != 0) {
1.57 christos 691: logit(LOG_INFO,
1.56 christos 692: "%s: interface %s becomes up. restart timer.",
1.21 itojun 693: __func__, rai->ifname);
1.10 itojun 694:
695: rai->initcounter = 0; /* reset the counter */
696: rai->waiting = 0; /* XXX */
1.39 roy 697: rtadvd_remove_timer(&rai->timer);
1.10 itojun 698: rai->timer = rtadvd_add_timer(ra_timeout,
1.14 itojun 699: ra_timer_update, rai, rai);
1.54 christos 700: ra_timer_update(rai, &rai->timer->tm);
1.10 itojun 701: rtadvd_set_timer(&rai->timer->tm, rai->timer);
1.65 roy 702: rtadvd_remove_timer(&rai->timer_sol);
703: rai->timer_sol = rtadvd_add_timer(ra_timeout_sol,
704: NULL, rai, NULL);
1.39 roy 705: } else if (prefixchange && rai->ifflags & IFF_UP) {
1.30 rpaulo 706: /*
707: * An advertised prefix has been added or invalidated.
708: * Will notice the change in a short delay.
709: */
710: rai->initcounter = 0;
1.65 roy 711: ra_timer_set_short_delay(rai, rai->timer);
1.10 itojun 712: }
1.1 itojun 713: }
714:
715: return;
716: }
717:
718: void
1.36 roy 719: rtadvd_input(void)
1.1 itojun 720: {
1.36 roy 721: ssize_t i;
1.1 itojun 722: int *hlimp = NULL;
723: struct icmp6_hdr *icp;
724: int ifindex = 0;
725: struct cmsghdr *cm;
726: struct in6_pktinfo *pi = NULL;
1.31 mrg 727: char ntopbuf[INET6_ADDRSTRLEN], ifnamebuf[IFNAMSIZ];
1.1 itojun 728: struct in6_addr dst = in6addr_any;
1.39 roy 729: struct rainfo *rai;
1.1 itojun 730:
731: /*
732: * Get message. We reset msg_controllen since the field could
733: * be modified if we had received a message before setting
734: * receive options.
735: */
1.6 itojun 736: rcvmhdr.msg_controllen = rcvcmsgbuflen;
1.56 christos 737: if ((i = prog_recvmsg(sock, &rcvmhdr, 0)) == -1)
1.1 itojun 738: return;
739:
1.41 roy 740: /* We read the buffer first to clear the FD */
741: if (do_die)
742: return;
743:
1.1 itojun 744: /* extract optional information via Advanced API */
745: for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(&rcvmhdr);
746: cm;
747: cm = (struct cmsghdr *)CMSG_NXTHDR(&rcvmhdr, cm)) {
748: if (cm->cmsg_level == IPPROTO_IPV6 &&
749: cm->cmsg_type == IPV6_PKTINFO &&
750: cm->cmsg_len == CMSG_LEN(sizeof(struct in6_pktinfo))) {
751: pi = (struct in6_pktinfo *)(CMSG_DATA(cm));
752: ifindex = pi->ipi6_ifindex;
753: dst = pi->ipi6_addr;
754: }
755: if (cm->cmsg_level == IPPROTO_IPV6 &&
756: cm->cmsg_type == IPV6_HOPLIMIT &&
757: cm->cmsg_len == CMSG_LEN(sizeof(int)))
758: hlimp = (int *)CMSG_DATA(cm);
759: }
760: if (ifindex == 0) {
1.57 christos 761: logit(LOG_ERR,
1.56 christos 762: "%s: failed to get receiving interface",
1.21 itojun 763: __func__);
1.1 itojun 764: return;
765: }
766: if (hlimp == NULL) {
1.57 christos 767: logit(LOG_ERR,
1.56 christos 768: "%s: failed to get receiving hop limit",
1.21 itojun 769: __func__);
1.1 itojun 770: return;
771: }
772:
1.39 roy 773: if ((rai = if_indextorainfo(pi->ipi6_ifindex)) == NULL) {
774: if (dflag > 1) {
1.57 christos 775: logit(LOG_DEBUG,
1.56 christos 776: "%s: received data for non advertising "
1.39 roy 777: "interface (%s)",
778: __func__,
779: if_indextoname(pi->ipi6_ifindex, ifnamebuf));
780: }
781: return;
782: }
1.10 itojun 783: /*
784: * If we happen to receive data on an interface which is now down,
785: * just discard the data.
786: */
1.39 roy 787: if ((rai->ifflags & IFF_UP) == 0) {
1.57 christos 788: logit(LOG_INFO,
1.56 christos 789: "%s: received data on a disabled interface (%s)",
1.21 itojun 790: __func__,
1.10 itojun 791: if_indextoname(pi->ipi6_ifindex, ifnamebuf));
792: return;
793: }
794:
1.36 roy 795: if ((size_t)i < sizeof(struct icmp6_hdr)) {
1.57 christos 796: logit(LOG_ERR,
1.56 christos 797: "%s: packet size(%zd) is too short",
1.21 itojun 798: __func__, i);
1.1 itojun 799: return;
800: }
801:
802: icp = (struct icmp6_hdr *)rcvmhdr.msg_iov[0].iov_base;
803:
1.14 itojun 804: switch (icp->icmp6_type) {
805: case ND_ROUTER_SOLICIT:
806: /*
807: * Message verification - RFC-2461 6.1.1
808: * XXX: these checks must be done in the kernel as well,
809: * but we can't completely rely on them.
810: */
811: if (*hlimp != 255) {
1.57 christos 812: logit(LOG_NOTICE,
1.56 christos 813: "%s: RS with invalid hop limit(%d) "
1.14 itojun 814: "received from %s on %s",
1.21 itojun 815: __func__, *hlimp,
1.30 rpaulo 816: inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf,
1.14 itojun 817: INET6_ADDRSTRLEN),
818: if_indextoname(pi->ipi6_ifindex, ifnamebuf));
819: return;
820: }
821: if (icp->icmp6_code) {
1.57 christos 822: logit(LOG_NOTICE,
1.56 christos 823: "%s: RS with invalid ICMP6 code(%d) "
1.14 itojun 824: "received from %s on %s",
1.21 itojun 825: __func__, icp->icmp6_code,
1.30 rpaulo 826: inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf,
1.14 itojun 827: INET6_ADDRSTRLEN),
828: if_indextoname(pi->ipi6_ifindex, ifnamebuf));
829: return;
830: }
1.36 roy 831: if ((size_t)i < sizeof(struct nd_router_solicit)) {
1.57 christos 832: logit(LOG_NOTICE,
1.56 christos 833: "%s: RS from %s on %s does not have enough "
1.36 roy 834: "length (len = %zd)",
1.21 itojun 835: __func__,
1.30 rpaulo 836: inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf,
1.14 itojun 837: INET6_ADDRSTRLEN),
838: if_indextoname(pi->ipi6_ifindex, ifnamebuf), i);
839: return;
840: }
1.30 rpaulo 841: rs_input(i, (struct nd_router_solicit *)icp, pi, &rcvfrom);
1.14 itojun 842: break;
843: case ND_ROUTER_ADVERT:
844: /*
845: * Message verification - RFC-2461 6.1.2
846: * XXX: there's a same dilemma as above...
847: */
848: if (*hlimp != 255) {
1.57 christos 849: logit(LOG_NOTICE,
1.56 christos 850: "%s: RA with invalid hop limit(%d) "
1.14 itojun 851: "received from %s on %s",
1.21 itojun 852: __func__, *hlimp,
1.30 rpaulo 853: inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf,
1.14 itojun 854: INET6_ADDRSTRLEN),
855: if_indextoname(pi->ipi6_ifindex, ifnamebuf));
856: return;
857: }
858: if (icp->icmp6_code) {
1.57 christos 859: logit(LOG_NOTICE,
1.56 christos 860: "%s: RA with invalid ICMP6 code(%d) "
1.14 itojun 861: "received from %s on %s",
1.21 itojun 862: __func__, icp->icmp6_code,
1.30 rpaulo 863: inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf,
1.14 itojun 864: INET6_ADDRSTRLEN),
865: if_indextoname(pi->ipi6_ifindex, ifnamebuf));
866: return;
867: }
1.36 roy 868: if ((size_t)i < sizeof(struct nd_router_advert)) {
1.57 christos 869: logit(LOG_NOTICE,
1.56 christos 870: "%s: RA from %s on %s does not have enough "
1.36 roy 871: "length (len = %zd)",
1.21 itojun 872: __func__,
1.30 rpaulo 873: inet_ntop(AF_INET6, &rcvfrom.sin6_addr, ntopbuf,
1.14 itojun 874: INET6_ADDRSTRLEN),
875: if_indextoname(pi->ipi6_ifindex, ifnamebuf), i);
876: return;
877: }
1.30 rpaulo 878: ra_input(i, (struct nd_router_advert *)icp, pi, &rcvfrom);
1.14 itojun 879: break;
880: case ICMP6_ROUTER_RENUMBERING:
881: if (accept_rr == 0) {
1.57 christos 882: logit(LOG_ERR, "%s: received a router renumbering "
1.14 itojun 883: "message, but not allowed to be accepted",
1.21 itojun 884: __func__);
1.14 itojun 885: break;
886: }
1.30 rpaulo 887: rr_input(i, (struct icmp6_router_renum *)icp, pi, &rcvfrom,
1.14 itojun 888: &dst);
889: break;
890: default:
891: /*
892: * Note that this case is POSSIBLE, especially just
893: * after invocation of the daemon. This is because we
894: * could receive message after opening the socket and
895: * before setting ICMP6 type filter(see sock_open()).
896: */
1.57 christos 897: logit(LOG_ERR, "%s: invalid icmp type(%d)",
1.21 itojun 898: __func__, icp->icmp6_type);
1.14 itojun 899: return;
1.1 itojun 900: }
901: }
902:
903: static void
904: rs_input(int len, struct nd_router_solicit *rs,
905: struct in6_pktinfo *pi, struct sockaddr_in6 *from)
906: {
1.31 mrg 907: char ntopbuf[INET6_ADDRSTRLEN], ifnamebuf[IFNAMSIZ];
1.1 itojun 908: union nd_opts ndopts;
1.39 roy 909: struct rainfo *rai;
1.30 rpaulo 910: struct soliciter *sol;
1.1 itojun 911:
1.57 christos 912: logit(LOG_DEBUG,
1.56 christos 913: "%s: RS received from %s on %s",
1.21 itojun 914: __func__,
1.1 itojun 915: inet_ntop(AF_INET6, &from->sin6_addr,
916: ntopbuf, INET6_ADDRSTRLEN),
917: if_indextoname(pi->ipi6_ifindex, ifnamebuf));
918:
919: /* ND option check */
920: memset(&ndopts, 0, sizeof(ndopts));
1.36 roy 921: TAILQ_INIT(&ndopts.nd_opts_list);
1.1 itojun 922: if (nd6_options((struct nd_opt_hdr *)(rs + 1),
923: len - sizeof(struct nd_router_solicit),
1.18 itojun 924: &ndopts, NDOPT_FLAG_SRCLINKADDR)) {
1.57 christos 925: logit(LOG_INFO,
1.56 christos 926: "%s: ND option check failed for an RS from %s on %s",
1.21 itojun 927: __func__,
1.1 itojun 928: inet_ntop(AF_INET6, &from->sin6_addr,
929: ntopbuf, INET6_ADDRSTRLEN),
930: if_indextoname(pi->ipi6_ifindex, ifnamebuf));
931: return;
932: }
933:
934: /*
935: * If the IP source address is the unspecified address, there
936: * must be no source link-layer address option in the message.
937: * (RFC-2461 6.1.1)
938: */
939: if (IN6_IS_ADDR_UNSPECIFIED(&from->sin6_addr) &&
940: ndopts.nd_opts_src_lladdr) {
1.57 christos 941: logit(LOG_INFO,
1.56 christos 942: "%s: RS from unspecified src on %s has a link-layer"
1.1 itojun 943: " address option",
1.21 itojun 944: __func__,
1.1 itojun 945: if_indextoname(pi->ipi6_ifindex, ifnamebuf));
946: goto done;
947: }
948:
1.39 roy 949: if ((rai = if_indextorainfo(pi->ipi6_ifindex)) == NULL) {
1.57 christos 950: logit(LOG_INFO,
1.56 christos 951: "%s: RS received on non advertising interface(%s)",
1.21 itojun 952: __func__,
1.1 itojun 953: if_indextoname(pi->ipi6_ifindex, ifnamebuf));
954: goto done;
955: }
956:
1.39 roy 957: if (rai->leaving) {
1.57 christos 958: logit(LOG_INFO,
1.56 christos 959: "%s: RS received on reconfiguring advertising interface(%s)",
1.39 roy 960: __func__, rai->ifname);
961: goto done;
962: }
963:
964: rai->rsinput++; /* increment statistics */
1.9 itojun 965:
1.1 itojun 966: /*
967: * Decide whether to send RA according to the rate-limit
968: * consideration.
969: */
1.10 itojun 970:
1.30 rpaulo 971: /* record sockaddr waiting for RA, if possible */
1.65 roy 972: TAILQ_FOREACH(sol, &rai->soliciter, next) {
973: if (IN6_ARE_ADDR_EQUAL(&sol->addr.sin6_addr, &from->sin6_addr))
974: break;
975: }
976: if (sol == NULL) {
977: sol = malloc(sizeof(*sol));
978: if (sol == NULL) {
979: logit(LOG_ERR, "%s: malloc: %m", __func__);
980: } else {
981: sol->addr = *from;
982: /* XXX RFC2553 need clarification on flowinfo */
983: sol->addr.sin6_flowinfo = 0;
984: TAILQ_INSERT_TAIL(&rai->soliciter, sol, next);
985: }
1.30 rpaulo 986: }
987:
988: /*
989: * If there is already a waiting RS packet, don't
990: * update the timer.
991: */
1.39 roy 992: if (rai->waiting++)
1.30 rpaulo 993: goto done;
994:
1.65 roy 995: ra_timer_set_short_delay(rai, rai->timer_sol);
1.1 itojun 996:
1.30 rpaulo 997: done:
998: free_ndopts(&ndopts);
999: }
1.1 itojun 1000:
1.39 roy 1001: void
1.65 roy 1002: ra_timer_set_short_delay(struct rainfo *rai, struct rtadvd_timer *timer)
1.30 rpaulo 1003: {
1004: long delay; /* must not be greater than 1000000 */
1.47 roy 1005: struct timespec interval, now, min_delay, tm_tmp, *rest;
1.1 itojun 1006:
1.30 rpaulo 1007: /*
1008: * Compute a random delay. If the computed value
1009: * corresponds to a time later than the time the next
1010: * multicast RA is scheduled to be sent, ignore the random
1011: * delay and send the advertisement at the
1012: * already-scheduled time. RFC2461 6.2.6
1013: */
1014: delay = arc4random() % MAX_RA_DELAY_TIME;
1015: interval.tv_sec = 0;
1.47 roy 1016: interval.tv_nsec = delay;
1.30 rpaulo 1017: rest = rtadvd_timer_rest(rai->timer);
1.47 roy 1018: if (timespeccmp(rest, &interval, <)) {
1.57 christos 1019: logit(LOG_DEBUG, "%s: random delay is larger than "
1.30 rpaulo 1020: "the rest of current timer", __func__);
1021: interval = *rest;
1.1 itojun 1022: }
1023:
1.30 rpaulo 1024: /*
1025: * If we sent a multicast Router Advertisement within
1026: * the last MIN_DELAY_BETWEEN_RAS seconds, schedule
1027: * the advertisement to be sent at a time corresponding to
1028: * MIN_DELAY_BETWEEN_RAS plus the random value after the
1029: * previous advertisement was sent.
1030: */
1.51 ozaki-r 1031: prog_clock_gettime(CLOCK_MONOTONIC, &now);
1.47 roy 1032: timespecsub(&now, &rai->lastsent, &tm_tmp);
1.30 rpaulo 1033: min_delay.tv_sec = MIN_DELAY_BETWEEN_RAS;
1.47 roy 1034: min_delay.tv_nsec = 0;
1035: if (timespeccmp(&tm_tmp, &min_delay, <)) {
1036: timespecsub(&min_delay, &tm_tmp, &min_delay);
1037: timespecadd(&min_delay, &interval, &interval);
1.30 rpaulo 1038: }
1.65 roy 1039: rtadvd_set_timer(&interval, timer);
1.1 itojun 1040: }
1041:
1042: static void
1043: ra_input(int len, struct nd_router_advert *ra,
1044: struct in6_pktinfo *pi, struct sockaddr_in6 *from)
1045: {
1046: struct rainfo *rai;
1.31 mrg 1047: char ntopbuf[INET6_ADDRSTRLEN], ifnamebuf[IFNAMSIZ];
1.1 itojun 1048: union nd_opts ndopts;
1.36 roy 1049: const char *on_off[] = {"OFF", "ON"};
1050: uint32_t reachabletime, retranstimer, mtu;
1051: struct nd_optlist *optp;
1.9 itojun 1052: int inconsistent = 0;
1.1 itojun 1053:
1.57 christos 1054: logit(LOG_DEBUG,
1.56 christos 1055: "%s: RA received from %s on %s",
1.21 itojun 1056: __func__,
1.1 itojun 1057: inet_ntop(AF_INET6, &from->sin6_addr,
1058: ntopbuf, INET6_ADDRSTRLEN),
1059: if_indextoname(pi->ipi6_ifindex, ifnamebuf));
1.36 roy 1060:
1.1 itojun 1061: /* ND option check */
1062: memset(&ndopts, 0, sizeof(ndopts));
1.36 roy 1063: TAILQ_INIT(&ndopts.nd_opts_list);
1.1 itojun 1064: if (nd6_options((struct nd_opt_hdr *)(ra + 1),
1.36 roy 1065: len - sizeof(struct nd_router_advert),
1066: &ndopts, NDOPT_FLAG_SRCLINKADDR |
1067: NDOPT_FLAG_PREFIXINFO | NDOPT_FLAG_MTU |
1068: NDOPT_FLAG_RDNSS | NDOPT_FLAG_DNSSL))
1069: {
1.57 christos 1070: logit(LOG_INFO,
1.56 christos 1071: "%s: ND option check failed for an RA from %s on %s",
1.36 roy 1072: __func__,
1073: inet_ntop(AF_INET6, &from->sin6_addr,
1074: ntopbuf, INET6_ADDRSTRLEN),
1075: if_indextoname(pi->ipi6_ifindex, ifnamebuf));
1.1 itojun 1076: return;
1077: }
1078:
1079: /*
1080: * RA consistency check according to RFC-2461 6.2.7
1081: */
1082: if ((rai = if_indextorainfo(pi->ipi6_ifindex)) == 0) {
1.57 christos 1083: logit(LOG_INFO,
1.56 christos 1084: "%s: received RA from %s on non-advertising"
1.1 itojun 1085: " interface(%s)",
1.21 itojun 1086: __func__,
1.1 itojun 1087: inet_ntop(AF_INET6, &from->sin6_addr,
1088: ntopbuf, INET6_ADDRSTRLEN),
1089: if_indextoname(pi->ipi6_ifindex, ifnamebuf));
1090: goto done;
1091: }
1.39 roy 1092: if (rai->leaving) {
1.57 christos 1093: logit(LOG_DEBUG,
1.56 christos 1094: "%s: received RA on re-configuring interface (%s)",
1.39 roy 1095: __func__, rai->ifname);
1096: goto done;
1097: }
1.9 itojun 1098: rai->rainput++; /* increment statistics */
1.61 roy 1099:
1.1 itojun 1100: /* Cur Hop Limit value */
1101: if (ra->nd_ra_curhoplimit && rai->hoplimit &&
1102: ra->nd_ra_curhoplimit != rai->hoplimit) {
1.57 christos 1103: logit(LOG_INFO,
1.56 christos 1104: "%s: CurHopLimit inconsistent on %s:"
1.1 itojun 1105: " %d from %s, %d from us",
1.21 itojun 1106: __func__,
1.1 itojun 1107: rai->ifname,
1108: ra->nd_ra_curhoplimit,
1109: inet_ntop(AF_INET6, &from->sin6_addr,
1110: ntopbuf, INET6_ADDRSTRLEN),
1111: rai->hoplimit);
1.9 itojun 1112: inconsistent++;
1.1 itojun 1113: }
1114: /* M flag */
1115: if ((ra->nd_ra_flags_reserved & ND_RA_FLAG_MANAGED) !=
1116: rai->managedflg) {
1.57 christos 1117: logit(LOG_INFO,
1.56 christos 1118: "%s: M flag inconsistent on %s:"
1.1 itojun 1119: " %s from %s, %s from us",
1.21 itojun 1120: __func__,
1.1 itojun 1121: rai->ifname,
1122: on_off[!rai->managedflg],
1123: inet_ntop(AF_INET6, &from->sin6_addr,
1124: ntopbuf, INET6_ADDRSTRLEN),
1125: on_off[rai->managedflg]);
1.9 itojun 1126: inconsistent++;
1.1 itojun 1127: }
1128: /* O flag */
1129: if ((ra->nd_ra_flags_reserved & ND_RA_FLAG_OTHER) !=
1130: rai->otherflg) {
1.57 christos 1131: logit(LOG_INFO,
1.56 christos 1132: "%s: O flag inconsistent on %s:"
1.1 itojun 1133: " %s from %s, %s from us",
1.21 itojun 1134: __func__,
1.1 itojun 1135: rai->ifname,
1136: on_off[!rai->otherflg],
1137: inet_ntop(AF_INET6, &from->sin6_addr,
1138: ntopbuf, INET6_ADDRSTRLEN),
1139: on_off[rai->otherflg]);
1.9 itojun 1140: inconsistent++;
1.1 itojun 1141: }
1142: /* Reachable Time */
1143: reachabletime = ntohl(ra->nd_ra_reachable);
1144: if (reachabletime && rai->reachabletime &&
1145: reachabletime != rai->reachabletime) {
1.57 christos 1146: logit(LOG_INFO,
1.56 christos 1147: "%s: ReachableTime inconsistent on %s:"
1.1 itojun 1148: " %d from %s, %d from us",
1.21 itojun 1149: __func__,
1.1 itojun 1150: rai->ifname,
1151: reachabletime,
1152: inet_ntop(AF_INET6, &from->sin6_addr,
1153: ntopbuf, INET6_ADDRSTRLEN),
1154: rai->reachabletime);
1.9 itojun 1155: inconsistent++;
1.1 itojun 1156: }
1157: /* Retrans Timer */
1158: retranstimer = ntohl(ra->nd_ra_retransmit);
1159: if (retranstimer && rai->retranstimer &&
1160: retranstimer != rai->retranstimer) {
1.57 christos 1161: logit(LOG_INFO,
1.56 christos 1162: "%s: RetranceTimer inconsistent on %s:"
1.1 itojun 1163: " %d from %s, %d from us",
1.21 itojun 1164: __func__,
1.1 itojun 1165: rai->ifname,
1166: retranstimer,
1167: inet_ntop(AF_INET6, &from->sin6_addr,
1168: ntopbuf, INET6_ADDRSTRLEN),
1169: rai->retranstimer);
1.9 itojun 1170: inconsistent++;
1.1 itojun 1171: }
1172: /* Values in the MTU options */
1173: if (ndopts.nd_opts_mtu) {
1174: mtu = ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu);
1175: if (mtu && rai->linkmtu && mtu != rai->linkmtu) {
1.57 christos 1176: logit(LOG_INFO,
1.56 christos 1177: "%s: MTU option value inconsistent on %s:"
1.1 itojun 1178: " %d from %s, %d from us",
1.21 itojun 1179: __func__,
1.1 itojun 1180: rai->ifname, mtu,
1181: inet_ntop(AF_INET6, &from->sin6_addr,
1182: ntopbuf, INET6_ADDRSTRLEN),
1183: rai->linkmtu);
1.9 itojun 1184: inconsistent++;
1.1 itojun 1185: }
1186: }
1187: /* Preferred and Valid Lifetimes for prefixes */
1.36 roy 1188: if (ndopts.nd_opts_pi)
1189: if (prefix_check(ndopts.nd_opts_pi, rai, from))
1190: inconsistent++;
1191: TAILQ_FOREACH(optp, &ndopts.nd_opts_list, next)
1192: if (prefix_check((struct nd_opt_prefix_info *)optp->opt,
1193: rai, from))
1194: inconsistent++;
1.9 itojun 1195:
1.11 itojun 1196: if (inconsistent)
1.9 itojun 1197: rai->rainconsistent++;
1.61 roy 1198:
1.30 rpaulo 1199: done:
1.1 itojun 1200: free_ndopts(&ndopts);
1201: }
1202:
1.9 itojun 1203: /* return a non-zero value if the received prefix is inconsitent with ours */
1204: static int
1.1 itojun 1205: prefix_check(struct nd_opt_prefix_info *pinfo,
1206: struct rainfo *rai, struct sockaddr_in6 *from)
1207: {
1.36 roy 1208: uint32_t preferred_time, valid_time;
1.1 itojun 1209: struct prefix *pp;
1.9 itojun 1210: int inconsistent = 0;
1.31 mrg 1211: char ntopbuf[INET6_ADDRSTRLEN], prefixbuf[INET6_ADDRSTRLEN];
1.47 roy 1212: struct timespec now;
1.60 roy 1213: struct in6_addr prefix;
1.1 itojun 1214:
1215: #if 0 /* impossible */
1216: if (pinfo->nd_opt_pi_type != ND_OPT_PREFIX_INFORMATION)
1.54 christos 1217: return 0;
1.1 itojun 1218: #endif
1219:
1.60 roy 1220: memcpy(&prefix, &pinfo->nd_opt_pi_prefix, sizeof(prefix));
1221:
1.1 itojun 1222: /*
1223: * log if the adveritsed prefix has link-local scope(sanity check?)
1224: */
1.60 roy 1225: if (IN6_IS_ADDR_LINKLOCAL(&prefix)) {
1.57 christos 1226: logit(LOG_INFO,
1.56 christos 1227: "%s: link-local prefix %s/%d is advertised "
1.1 itojun 1228: "from %s on %s",
1.21 itojun 1229: __func__,
1.60 roy 1230: inet_ntop(AF_INET6, &prefix,
1.1 itojun 1231: prefixbuf, INET6_ADDRSTRLEN),
1232: pinfo->nd_opt_pi_prefix_len,
1233: inet_ntop(AF_INET6, &from->sin6_addr,
1234: ntopbuf, INET6_ADDRSTRLEN),
1235: rai->ifname);
1236: }
1237:
1.60 roy 1238: if ((pp = find_prefix(rai, &prefix,
1.1 itojun 1239: pinfo->nd_opt_pi_prefix_len)) == NULL) {
1.57 christos 1240: logit(LOG_INFO,
1.56 christos 1241: "%s: prefix %s/%d from %s on %s is not in our list",
1.21 itojun 1242: __func__,
1.60 roy 1243: inet_ntop(AF_INET6, &prefix,
1.1 itojun 1244: prefixbuf, INET6_ADDRSTRLEN),
1245: pinfo->nd_opt_pi_prefix_len,
1246: inet_ntop(AF_INET6, &from->sin6_addr,
1247: ntopbuf, INET6_ADDRSTRLEN),
1248: rai->ifname);
1.54 christos 1249: return 0;
1.1 itojun 1250: }
1251:
1252: preferred_time = ntohl(pinfo->nd_opt_pi_preferred_time);
1.11 itojun 1253: if (pp->pltimeexpire) {
1254: /*
1255: * The lifetime is decremented in real time, so we should
1256: * compare the expiration time.
1257: * (RFC 2461 Section 6.2.7.)
1258: * XXX: can we really expect that all routers on the link
1259: * have synchronized clocks?
1260: */
1.51 ozaki-r 1261: prog_clock_gettime(CLOCK_MONOTONIC, &now);
1.11 itojun 1262: preferred_time += now.tv_sec;
1263:
1.30 rpaulo 1264: if (!pp->timer && rai->clockskew &&
1.46 joerg 1265: llabs((long long)preferred_time - pp->pltimeexpire) > rai->clockskew) {
1.57 christos 1266: logit(LOG_INFO,
1.56 christos 1267: "%s: preferred lifetime for %s/%d"
1.11 itojun 1268: " (decr. in real time) inconsistent on %s:"
1269: " %d from %s, %ld from us",
1.21 itojun 1270: __func__,
1.60 roy 1271: inet_ntop(AF_INET6, &prefix,
1.11 itojun 1272: prefixbuf, INET6_ADDRSTRLEN),
1273: pinfo->nd_opt_pi_prefix_len,
1274: rai->ifname, preferred_time,
1275: inet_ntop(AF_INET6, &from->sin6_addr,
1276: ntopbuf, INET6_ADDRSTRLEN),
1277: pp->pltimeexpire);
1278: inconsistent++;
1279: }
1.30 rpaulo 1280: } else if (!pp->timer && preferred_time != pp->preflifetime) {
1.57 christos 1281: logit(LOG_INFO,
1.56 christos 1282: "%s: preferred lifetime for %s/%d"
1.1 itojun 1283: " inconsistent on %s:"
1284: " %d from %s, %d from us",
1.21 itojun 1285: __func__,
1.60 roy 1286: inet_ntop(AF_INET6, &prefix,
1.1 itojun 1287: prefixbuf, INET6_ADDRSTRLEN),
1288: pinfo->nd_opt_pi_prefix_len,
1289: rai->ifname, preferred_time,
1290: inet_ntop(AF_INET6, &from->sin6_addr,
1291: ntopbuf, INET6_ADDRSTRLEN),
1292: pp->preflifetime);
1.9 itojun 1293: }
1.1 itojun 1294:
1295: valid_time = ntohl(pinfo->nd_opt_pi_valid_time);
1.11 itojun 1296: if (pp->vltimeexpire) {
1.51 ozaki-r 1297: prog_clock_gettime(CLOCK_MONOTONIC, &now);
1.11 itojun 1298: valid_time += now.tv_sec;
1299:
1.30 rpaulo 1300: if (!pp->timer && rai->clockskew &&
1.46 joerg 1301: llabs((long long)valid_time - pp->vltimeexpire) > rai->clockskew) {
1.57 christos 1302: logit(LOG_INFO,
1.56 christos 1303: "%s: valid lifetime for %s/%d"
1.11 itojun 1304: " (decr. in real time) inconsistent on %s:"
1305: " %d from %s, %ld from us",
1.21 itojun 1306: __func__,
1.60 roy 1307: inet_ntop(AF_INET6, &prefix,
1.11 itojun 1308: prefixbuf, INET6_ADDRSTRLEN),
1309: pinfo->nd_opt_pi_prefix_len,
1310: rai->ifname, preferred_time,
1311: inet_ntop(AF_INET6, &from->sin6_addr,
1312: ntopbuf, INET6_ADDRSTRLEN),
1313: pp->vltimeexpire);
1314: inconsistent++;
1315: }
1.30 rpaulo 1316: } else if (!pp->timer && valid_time != pp->validlifetime) {
1.57 christos 1317: logit(LOG_INFO,
1.56 christos 1318: "%s: valid lifetime for %s/%d"
1.1 itojun 1319: " inconsistent on %s:"
1320: " %d from %s, %d from us",
1.21 itojun 1321: __func__,
1.60 roy 1322: inet_ntop(AF_INET6, &prefix,
1.1 itojun 1323: prefixbuf, INET6_ADDRSTRLEN),
1324: pinfo->nd_opt_pi_prefix_len,
1325: rai->ifname, valid_time,
1326: inet_ntop(AF_INET6, &from->sin6_addr,
1327: ntopbuf, INET6_ADDRSTRLEN),
1328: pp->validlifetime);
1.9 itojun 1329: inconsistent++;
1330: }
1331:
1.54 christos 1332: return inconsistent;
1.1 itojun 1333: }
1334:
1335: struct prefix *
1336: find_prefix(struct rainfo *rai, struct in6_addr *prefix, int plen)
1337: {
1338: struct prefix *pp;
1339: int bytelen, bitlen;
1.36 roy 1340: unsigned char bitmask;
1.1 itojun 1341:
1.36 roy 1342: TAILQ_FOREACH(pp, &rai->prefix, next) {
1.1 itojun 1343: if (plen != pp->prefixlen)
1344: continue;
1345: bytelen = plen / 8;
1346: bitlen = plen % 8;
1.15 itojun 1347: bitmask = 0xff << (8 - bitlen);
1.54 christos 1348: if (memcmp(prefix, &pp->prefix, bytelen))
1.1 itojun 1349: continue;
1.15 itojun 1350: if (bitlen == 0 ||
1.61 roy 1351: ((prefix->s6_addr[bytelen] & bitmask) ==
1.15 itojun 1352: (pp->prefix.s6_addr[bytelen] & bitmask))) {
1.54 christos 1353: return pp;
1.15 itojun 1354: }
1.1 itojun 1355: }
1356:
1.54 christos 1357: return NULL;
1.1 itojun 1358: }
1359:
1.11 itojun 1360: /* check if p0/plen0 matches p1/plen1; return 1 if matches, otherwise 0. */
1361: int
1362: prefix_match(struct in6_addr *p0, int plen0,
1363: struct in6_addr *p1, int plen1)
1364: {
1365: int bytelen, bitlen;
1.36 roy 1366: unsigned char bitmask;
1.11 itojun 1367:
1368: if (plen0 < plen1)
1.54 christos 1369: return 0;
1.11 itojun 1370: bytelen = plen1 / 8;
1371: bitlen = plen1 % 8;
1.15 itojun 1372: bitmask = 0xff << (8 - bitlen);
1.54 christos 1373: if (memcmp(p0, p1, bytelen))
1374: return 0;
1.15 itojun 1375: if (bitlen == 0 ||
1376: ((p0->s6_addr[bytelen] & bitmask) ==
1.61 roy 1377: (p1->s6_addr[bytelen] & bitmask))) {
1.54 christos 1378: return 1;
1.15 itojun 1379: }
1.11 itojun 1380:
1.54 christos 1381: return 0;
1.11 itojun 1382: }
1383:
1.1 itojun 1384: static int
1385: nd6_options(struct nd_opt_hdr *hdr, int limit,
1.36 roy 1386: union nd_opts *ndopts, uint32_t optflags)
1.1 itojun 1387: {
1388: int optlen = 0;
1389:
1390: for (; limit > 0; limit -= optlen) {
1.36 roy 1391: if ((size_t)limit < sizeof(struct nd_opt_hdr)) {
1.57 christos 1392: logit(LOG_INFO, "%s: short option header", __func__);
1.27 itojun 1393: goto bad;
1394: }
1395:
1.36 roy 1396: hdr = (struct nd_opt_hdr *)((char *)hdr + optlen);
1.1 itojun 1397: if (hdr->nd_opt_len == 0) {
1.57 christos 1398: logit(LOG_INFO,
1.56 christos 1399: "%s: bad ND option length(0) (type = %d)",
1.21 itojun 1400: __func__, hdr->nd_opt_type);
1.1 itojun 1401: goto bad;
1402: }
1.27 itojun 1403: optlen = hdr->nd_opt_len << 3;
1404: if (optlen > limit) {
1.57 christos 1405: logit(LOG_INFO, "%s: short option", __func__);
1.27 itojun 1406: goto bad;
1407: }
1.1 itojun 1408:
1.36 roy 1409: if (hdr->nd_opt_type > ND_OPT_MTU &&
1410: hdr->nd_opt_type != ND_OPT_RDNSS &&
1411: hdr->nd_opt_type != ND_OPT_DNSSL)
1.17 itojun 1412: {
1.57 christos 1413: logit(LOG_INFO, "%s: unknown ND option(type %d)",
1.21 itojun 1414: __func__, hdr->nd_opt_type);
1.1 itojun 1415: continue;
1416: }
1417:
1418: if ((ndopt_flags[hdr->nd_opt_type] & optflags) == 0) {
1.57 christos 1419: logit(LOG_INFO, "%s: unexpected ND option(type %d)",
1.21 itojun 1420: __func__, hdr->nd_opt_type);
1.1 itojun 1421: continue;
1422: }
1423:
1.27 itojun 1424: /*
1425: * Option length check. Do it here for all fixed-length
1426: * options.
1427: */
1428: if ((hdr->nd_opt_type == ND_OPT_MTU &&
1429: (optlen != sizeof(struct nd_opt_mtu))) ||
1430: ((hdr->nd_opt_type == ND_OPT_PREFIX_INFORMATION &&
1.42 roy 1431: optlen != sizeof(struct nd_opt_prefix_info))) ||
1432: (hdr->nd_opt_type == ND_OPT_RDNSS &&
1433: ((optlen < (int)sizeof(struct nd_opt_rdnss) ||
1434: (optlen - sizeof(struct nd_opt_rdnss)) % 16 != 0))) ||
1435: (hdr->nd_opt_type == ND_OPT_DNSSL &&
1436: optlen < (int)sizeof(struct nd_opt_dnssl)))
1437: {
1.57 christos 1438: logit(LOG_INFO, "%s: invalid option length",
1.27 itojun 1439: __func__);
1440: continue;
1441: }
1442:
1.14 itojun 1443: switch (hdr->nd_opt_type) {
1444: case ND_OPT_TARGET_LINKADDR:
1445: case ND_OPT_REDIRECTED_HEADER:
1.42 roy 1446: case ND_OPT_RDNSS:
1447: case ND_OPT_DNSSL:
1.27 itojun 1448: break; /* we don't care about these options */
1.30 rpaulo 1449: case ND_OPT_SOURCE_LINKADDR:
1.14 itojun 1450: case ND_OPT_MTU:
1451: if (ndopts->nd_opt_array[hdr->nd_opt_type]) {
1.57 christos 1452: logit(LOG_INFO,
1.56 christos 1453: "%s: duplicated ND option (type = %d)",
1.21 itojun 1454: __func__, hdr->nd_opt_type);
1.14 itojun 1455: }
1456: ndopts->nd_opt_array[hdr->nd_opt_type] = hdr;
1457: break;
1458: case ND_OPT_PREFIX_INFORMATION:
1459: {
1460: struct nd_optlist *pfxlist;
1461:
1462: if (ndopts->nd_opts_pi == 0) {
1463: ndopts->nd_opts_pi =
1464: (struct nd_opt_prefix_info *)hdr;
1465: continue;
1466: }
1467: if ((pfxlist = malloc(sizeof(*pfxlist))) == NULL) {
1.57 christos 1468: logit(LOG_ERR, "%s: can't allocate memory",
1.21 itojun 1469: __func__);
1.14 itojun 1470: goto bad;
1471: }
1472: pfxlist->opt = hdr;
1.36 roy 1473: TAILQ_INSERT_TAIL(&ndopts->nd_opts_list, pfxlist, next);
1.14 itojun 1474:
1475: break;
1476: }
1477: default: /* impossible */
1478: break;
1.1 itojun 1479: }
1480: }
1481:
1.54 christos 1482: return 0;
1.1 itojun 1483:
1484: bad:
1485: free_ndopts(ndopts);
1.54 christos 1486: return -1;
1.1 itojun 1487: }
1488:
1489: static void
1490: free_ndopts(union nd_opts *ndopts)
1491: {
1.36 roy 1492: struct nd_optlist *opt;
1.1 itojun 1493:
1.36 roy 1494: while ((opt = TAILQ_FIRST(&ndopts->nd_opts_list)) != NULL) {
1495: TAILQ_REMOVE(&ndopts->nd_opts_list, opt, next);
1.1 itojun 1496: free(opt);
1497: }
1498: }
1499:
1500: void
1.36 roy 1501: sock_open(void)
1.1 itojun 1502: {
1503: struct icmp6_filter filt;
1504: struct ipv6_mreq mreq;
1.36 roy 1505: struct rainfo *ra;
1.1 itojun 1506: int on;
1507: /* XXX: should be max MTU attached to the node */
1.36 roy 1508: static unsigned char answer[1500];
1.6 itojun 1509:
1510: rcvcmsgbuflen = CMSG_SPACE(sizeof(struct in6_pktinfo)) +
1511: CMSG_SPACE(sizeof(int));
1.36 roy 1512: rcvcmsgbuf = malloc(rcvcmsgbuflen);
1.6 itojun 1513: if (rcvcmsgbuf == NULL) {
1.57 christos 1514: logit(LOG_ERR, "%s: malloc: %m", __func__);
1.54 christos 1515: exit(EXIT_FAILURE);
1.6 itojun 1516: }
1517:
1.66 roy 1518: sndcmsgbuflen = CMSG_SPACE(sizeof(struct in6_pktinfo));
1.36 roy 1519: sndcmsgbuf = malloc(sndcmsgbuflen);
1.6 itojun 1520: if (sndcmsgbuf == NULL) {
1.57 christos 1521: logit(LOG_ERR, "%s: malloc: %m", __func__);
1.54 christos 1522: exit(EXIT_FAILURE);
1.6 itojun 1523: }
1.1 itojun 1524:
1.56 christos 1525: if ((sock = prog_socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) == -1) {
1.57 christos 1526: logit(LOG_ERR, "%s: socket: %m", __func__);
1.54 christos 1527: exit(EXIT_FAILURE);
1.1 itojun 1528: }
1529:
1.48 roy 1530: /* RFC 4861 Section 4.2 */
1531: on = 255;
1.51 ozaki-r 1532: if (prog_setsockopt(sock, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &on,
1.48 roy 1533: sizeof(on)) == -1) {
1.57 christos 1534: logit(LOG_ERR, "%s: IPV6_MULTICAST_HOPS: %m", __func__);
1.54 christos 1535: exit(EXIT_FAILURE);
1.48 roy 1536: }
1.65 roy 1537: on = 255;
1538: if (prog_setsockopt(sock, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &on,
1539: sizeof(on)) == -1) {
1540: logit(LOG_ERR, "%s: IPV6_UNICAST_HOPS: %m", __func__);
1541: exit(EXIT_FAILURE);
1542: }
1.48 roy 1543:
1.1 itojun 1544: /* specify to tell receiving interface */
1545: on = 1;
1.51 ozaki-r 1546: if (prog_setsockopt(sock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &on,
1.56 christos 1547: sizeof(on)) == -1) {
1.57 christos 1548: logit(LOG_ERR, "%s: IPV6_RECVPKTINFO: %m", __func__);
1.54 christos 1549: exit(EXIT_FAILURE);
1.5 itojun 1550: }
1.1 itojun 1551:
1552: on = 1;
1553: /* specify to tell value of hoplimit field of received IP6 hdr */
1.51 ozaki-r 1554: if (prog_setsockopt(sock, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &on,
1.56 christos 1555: sizeof(on)) == -1) {
1.57 christos 1556: logit(LOG_ERR, "%s: IPV6_RECVHOPLIMIT: %m", __func__);
1.54 christos 1557: exit(EXIT_FAILURE);
1.5 itojun 1558: }
1.1 itojun 1559:
1560: ICMP6_FILTER_SETBLOCKALL(&filt);
1561: ICMP6_FILTER_SETPASS(ND_ROUTER_SOLICIT, &filt);
1562: ICMP6_FILTER_SETPASS(ND_ROUTER_ADVERT, &filt);
1563: if (accept_rr)
1564: ICMP6_FILTER_SETPASS(ICMP6_ROUTER_RENUMBERING, &filt);
1.51 ozaki-r 1565: if (prog_setsockopt(sock, IPPROTO_ICMPV6, ICMP6_FILTER, &filt,
1.56 christos 1566: sizeof(filt)) == -1) {
1.57 christos 1567: logit(LOG_ERR, "%s: IICMP6_FILTER: %m", __func__);
1.54 christos 1568: exit(EXIT_FAILURE);
1.1 itojun 1569: }
1570:
1571: /*
1572: * join all routers multicast address on each advertising interface.
1573: */
1.11 itojun 1574: if (inet_pton(AF_INET6, ALLROUTERS_LINK,
1.36 roy 1575: mreq.ipv6mr_multiaddr.s6_addr) != 1)
1576: {
1.57 christos 1577: logit(LOG_ERR, "%s: inet_pton failed(library bug?)",
1.36 roy 1578: __func__);
1.54 christos 1579: exit(EXIT_FAILURE);
1.1 itojun 1580: }
1.36 roy 1581: TAILQ_FOREACH(ra, &ralist, next) {
1.1 itojun 1582: mreq.ipv6mr_interface = ra->ifindex;
1.51 ozaki-r 1583: if (prog_setsockopt(sock, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq,
1.56 christos 1584: sizeof(mreq)) == -1) {
1.57 christos 1585: logit(LOG_ERR, "%s: IPV6_JOIN_GROUP(link) on %s: %m",
1.49 roy 1586: __func__, ra->ifname);
1.56 christos 1587: continue;
1.1 itojun 1588: }
1589: }
1.11 itojun 1590:
1591: /*
1592: * When attending router renumbering, join all-routers site-local
1.61 roy 1593: * multicast group.
1.11 itojun 1594: */
1595: if (accept_rr) {
1596: if (inet_pton(AF_INET6, ALLROUTERS_SITE,
1.36 roy 1597: mreq.ipv6mr_multiaddr.s6_addr) != 1)
1598: {
1.57 christos 1599: logit(LOG_ERR, "%s: inet_pton failed(library bug?)",
1.36 roy 1600: __func__);
1.54 christos 1601: exit(EXIT_FAILURE);
1.11 itojun 1602: }
1.36 roy 1603: ra = TAILQ_FIRST(&ralist);
1.11 itojun 1604: if (mcastif) {
1605: if ((mreq.ipv6mr_interface = if_nametoindex(mcastif))
1606: == 0) {
1.57 christos 1607: logit(LOG_ERR,
1.56 christos 1608: "%s: invalid interface: %s",
1.21 itojun 1609: __func__, mcastif);
1.54 christos 1610: exit(EXIT_FAILURE);
1.11 itojun 1611: }
1612: } else
1.36 roy 1613: mreq.ipv6mr_interface = ra->ifindex;
1.51 ozaki-r 1614: if (prog_setsockopt(sock, IPPROTO_IPV6, IPV6_JOIN_GROUP,
1.56 christos 1615: &mreq, sizeof(mreq)) == -1) {
1.57 christos 1616: logit(LOG_ERR,
1.56 christos 1617: "%s: IPV6_JOIN_GROUP(site) on %s: %m",
1.21 itojun 1618: __func__,
1.49 roy 1619: mcastif ? mcastif : ra->ifname);
1.54 christos 1620: exit(EXIT_FAILURE);
1.11 itojun 1621: }
1622: }
1.61 roy 1623:
1.1 itojun 1624: /* initialize msghdr for receiving packets */
1.36 roy 1625: rcviov[0].iov_base = answer;
1.1 itojun 1626: rcviov[0].iov_len = sizeof(answer);
1.36 roy 1627: rcvmhdr.msg_name = &rcvfrom;
1.30 rpaulo 1628: rcvmhdr.msg_namelen = sizeof(rcvfrom);
1.1 itojun 1629: rcvmhdr.msg_iov = rcviov;
1630: rcvmhdr.msg_iovlen = 1;
1.36 roy 1631: rcvmhdr.msg_control = rcvcmsgbuf;
1.6 itojun 1632: rcvmhdr.msg_controllen = rcvcmsgbuflen;
1.1 itojun 1633:
1634: /* initialize msghdr for sending packets */
1635: sndmhdr.msg_namelen = sizeof(struct sockaddr_in6);
1636: sndmhdr.msg_iov = sndiov;
1637: sndmhdr.msg_iovlen = 1;
1.54 christos 1638: sndmhdr.msg_control = sndcmsgbuf;
1.6 itojun 1639: sndmhdr.msg_controllen = sndcmsgbuflen;
1.1 itojun 1640: }
1641:
1642: /* open a routing socket to watch the routing table */
1643: static void
1.36 roy 1644: rtsock_open(void)
1.1 itojun 1645: {
1.53 roy 1646: #ifdef RO_MSGFILTER
1647: unsigned char msgfilter[] = {
1648: RTM_ADD, RTM_DELETE,
1649: RTM_NEWADDR, RTM_DELADDR,
1650: #ifdef RTM_IFANNOUNCE
1651: RTM_IFANNOUNCE,
1652: #endif
1653: RTM_IFINFO,
1654: };
1655: #endif
1656:
1.56 christos 1657: if ((rtsock = prog_socket(PF_ROUTE, SOCK_RAW, 0)) == -1) {
1.57 christos 1658: logit(LOG_ERR, "%s: socket: %m", __func__);
1.54 christos 1659: exit(EXIT_FAILURE);
1.1 itojun 1660: }
1.53 roy 1661: #ifdef RO_MSGFILTER
1662: if (setsockopt(rtsock, PF_ROUTE, RO_MSGFILTER,
1663: &msgfilter, sizeof(msgfilter) == -1))
1.57 christos 1664: logit(LOG_ERR, "%s: RO_MSGFILTER: %m", __func__);
1.53 roy 1665: #endif
1.1 itojun 1666: }
1667:
1.11 itojun 1668: struct rainfo *
1.36 roy 1669: if_indextorainfo(unsigned int idx)
1.1 itojun 1670: {
1.36 roy 1671: struct rainfo *rai;
1.1 itojun 1672:
1.36 roy 1673: TAILQ_FOREACH(rai, &ralist, next) {
1.35 lukem 1674: if (rai->ifindex == idx)
1.54 christos 1675: return rai;
1.1 itojun 1676: }
1677:
1.54 christos 1678: return NULL; /* search failed */
1.1 itojun 1679: }
1680:
1.39 roy 1681: struct rainfo *
1.65 roy 1682: ra_output(struct rainfo *rai, bool solicited)
1.1 itojun 1683: {
1684: int i;
1685: struct cmsghdr *cm;
1686: struct in6_pktinfo *pi;
1.36 roy 1687: struct soliciter *sol;
1.10 itojun 1688:
1.39 roy 1689: if ((rai->ifflags & IFF_UP) == 0) {
1.57 christos 1690: logit(LOG_DEBUG, "%s: %s is not up, skip sending RA",
1.39 roy 1691: __func__, rai->ifname);
1692: return NULL;
1.10 itojun 1693: }
1.1 itojun 1694:
1.39 roy 1695: make_packet(rai); /* XXX: inefficient */
1.11 itojun 1696:
1.36 roy 1697: sndmhdr.msg_name = (void *)&sin6_linklocal_allnodes;
1.39 roy 1698: sndmhdr.msg_iov[0].iov_base = (void *)rai->ra_data;
1699: sndmhdr.msg_iov[0].iov_len = rai->ra_datalen;
1.1 itojun 1700:
1.65 roy 1701: /* specify the outgoing interface */
1.1 itojun 1702: cm = CMSG_FIRSTHDR(&sndmhdr);
1703: cm->cmsg_level = IPPROTO_IPV6;
1704: cm->cmsg_type = IPV6_PKTINFO;
1705: cm->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
1706: pi = (struct in6_pktinfo *)CMSG_DATA(cm);
1707: memset(&pi->ipi6_addr, 0, sizeof(pi->ipi6_addr)); /*XXX*/
1.39 roy 1708: pi->ipi6_ifindex = rai->ifindex;
1.1 itojun 1709:
1.57 christos 1710: logit(LOG_DEBUG,
1.56 christos 1711: "%s: send RA on %s, # of waitings = %d",
1.39 roy 1712: __func__, rai->ifname, rai->waiting);
1.1 itojun 1713:
1.65 roy 1714: if (solicited) {
1715: /* unicast solicited RA's as per RFC 7772 */
1716: while ((sol = TAILQ_FIRST(&rai->soliciter)) != NULL) {
1717: sndmhdr.msg_name = (void *)&sol->addr;
1718: i = prog_sendmsg(sock, &sndmhdr, 0);
1719: if (i < 0 || (size_t)i != rai->ra_datalen) {
1720: if (i < 0) {
1721: logit(LOG_ERR,
1722: "%s: unicast sendmsg on %s: %m",
1723: __func__, rai->ifname);
1724: }
1725: }
1726: TAILQ_REMOVE(&rai->soliciter, sol, next);
1727: free(sol);
1728: }
1729:
1730: /* reset waiting conter */
1731: rai->waiting = 0;
1732:
1733: /* disable timer */
1734: rai->timer_sol->enabled = false;
1735:
1736: return rai;
1737: }
1738:
1.51 ozaki-r 1739: i = prog_sendmsg(sock, &sndmhdr, 0);
1.39 roy 1740: if (i < 0 || (size_t)i != rai->ra_datalen) {
1.1 itojun 1741: if (i < 0) {
1.57 christos 1742: logit(LOG_ERR, "%s: sendmsg on %s: %m",
1.49 roy 1743: __func__, rai->ifname);
1.1 itojun 1744: }
1745: }
1746:
1.39 roy 1747: if (rai->leaving_adv > 0) {
1748: if (--(rai->leaving_adv) == 0) {
1.41 roy 1749: /* leaving for ourself means we're shutting down */
1750: if (rai->leaving_for == rai) {
1751: TAILQ_REMOVE(&ralist, rai, next);
1752: free_rainfo(rai);
1753: return NULL;
1754: }
1.57 christos 1755: logit(LOG_DEBUG,
1.56 christos 1756: "%s: expired RA,"
1.39 roy 1757: " new config active for interface (%s)",
1758: __func__, rai->ifname);
1759: rai->leaving_for->timer = rtadvd_add_timer(ra_timeout,
1760: ra_timer_update,
1761: rai->leaving_for, rai->leaving_for);
1.65 roy 1762: ra_timer_set_short_delay(rai->leaving_for, rai->timer);
1.39 roy 1763: rai->leaving_for->leaving = NULL;
1764: free_rainfo(rai);
1765: return NULL;
1766: }
1767: }
1768:
1.1 itojun 1769: /* update counter */
1.39 roy 1770: if (rai->initcounter < MAX_INITIAL_RTR_ADVERTISEMENTS)
1771: rai->initcounter++;
1772: rai->raoutput++;
1.1 itojun 1773:
1774: /* update timestamp */
1.51 ozaki-r 1775: prog_clock_gettime(CLOCK_MONOTONIC, &rai->lastsent);
1.39 roy 1776: return rai;
1.1 itojun 1777: }
1778:
1.65 roy 1779: /* process unsolicited RA timer */
1.30 rpaulo 1780: struct rtadvd_timer *
1.1 itojun 1781: ra_timeout(void *data)
1782: {
1783: struct rainfo *rai = (struct rainfo *)data;
1784:
1.65 roy 1785: logit(LOG_DEBUG,
1786: "%s: unsolicited RA timer on %s is expired",
1787: __func__, rai->ifname);
1788:
1789: if (ra_output(rai, false))
1790: return rai->timer;
1791: return NULL;
1792: }
1793:
1794: /* process solicited RA timer */
1795: struct rtadvd_timer *
1796: ra_timeout_sol(void *data)
1797: {
1798: struct rainfo *rai = (struct rainfo *)data;
1.1 itojun 1799:
1.57 christos 1800: logit(LOG_DEBUG,
1.65 roy 1801: "%s: solicited RA timer on %s is expired",
1.21 itojun 1802: __func__, rai->ifname);
1.1 itojun 1803:
1.65 roy 1804: if (ra_output(rai, true))
1805: return rai->timer_sol;
1.39 roy 1806: return NULL;
1.1 itojun 1807: }
1808:
1809: /* update RA timer */
1810: void
1.47 roy 1811: ra_timer_update(void *data, struct timespec *tm)
1.1 itojun 1812: {
1813: struct rainfo *rai = (struct rainfo *)data;
1814: long interval;
1815:
1816: /*
1817: * Whenever a multicast advertisement is sent from an interface,
1818: * the timer is reset to a uniformly-distributed random value
1819: * between the interface's configured MinRtrAdvInterval and
1.11 itojun 1820: * MaxRtrAdvInterval (RFC2461 6.2.4).
1.1 itojun 1821: */
1.39 roy 1822: interval = rai->mininterval;
1823: if (rai->mininterval != rai->maxinterval)
1824: interval += arc4random() % (rai->maxinterval-rai->mininterval);
1.1 itojun 1825:
1826: /*
1827: * For the first few advertisements (up to
1828: * MAX_INITIAL_RTR_ADVERTISEMENTS), if the randomly chosen interval
1829: * is greater than MAX_INITIAL_RTR_ADVERT_INTERVAL, the timer
1830: * SHOULD be set to MAX_INITIAL_RTR_ADVERT_INTERVAL instead.
1831: * (RFC-2461 6.2.4)
1832: */
1833: if (rai->initcounter < MAX_INITIAL_RTR_ADVERTISEMENTS &&
1834: interval > MAX_INITIAL_RTR_ADVERT_INTERVAL)
1835: interval = MAX_INITIAL_RTR_ADVERT_INTERVAL;
1836:
1837: tm->tv_sec = interval;
1.47 roy 1838: tm->tv_nsec = 0;
1.1 itojun 1839:
1.57 christos 1840: logit(LOG_DEBUG,
1.56 christos 1841: "%s: RA timer on %s is set to %jd:%jd",
1.21 itojun 1842: __func__, rai->ifname,
1.54 christos 1843: (intmax_t)tm->tv_sec, (intmax_t)tm->tv_nsec);
1.1 itojun 1844: }
1.57 christos 1845:
1846: void
1847: logit(int level, const char *fmt, ...)
1848: {
1849: va_list ap;
1.67 christos 1850: char *buf;
1.57 christos 1851:
1852: va_start(ap, fmt);
1853: if (!Dflag) {
1854: vsyslog(level, fmt, ap);
1855: va_end(ap);
1856: return;
1857: }
1858:
1.68 ! christos 1859: vfprintf(stderr, expandm(fmt, "\n", &buf), ap);
! 1860: free(buf);
1.57 christos 1861: va_end(ap);
1862: }
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