2 /* $KAME: config.c,v 1.84 2003/08/05 12:34:23 itojun Exp $ */
5 * Copyright (C) 1998 WIDE Project.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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.
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
33 #include <sys/param.h>
34 #include <sys/ioctl.h>
35 #include <sys/socket.h>
37 #include <sys/sysctl.h>
40 #include <net/if_var.h>
41 #include <net/route.h>
42 #include <net/if_dl.h>
44 #include <netinet/in.h>
45 #include <netinet/in_var.h>
46 #include <netinet/ip6.h>
47 #include <netinet6/ip6_var.h>
48 #include <netinet/icmp6.h>
49 #include <netinet6/nd6.h>
51 #include <arpa/inet.h>
68 static time_t prefix_timo = (60 * 120); /* 2 hours.
69 * XXX: should be configurable. */
70 extern struct rainfo *ralist;
72 static struct rtadvd_timer *prefix_timeout __P((void *));
73 static void makeentry __P((char *, size_t, int, char *));
74 static int getinet6sysctl __P((int));
88 static int forwarding = -1;
90 #define MUSTHAVE(var, cap) \
93 if ((t = agetnum(cap)) < 0) { \
94 fprintf(stderr, "rtadvd: need %s for interface %s\n", \
100 #define MAYHAVE(var, cap, def) \
102 if ((var = agetnum(cap)) < 0) \
106 if ((stat = agetent(tbuf, intface)) <= 0) {
107 memset(tbuf, 0, sizeof(tbuf));
109 "<%s> %s isn't defined in the configuration file"
110 " or the configuration file doesn't exist."
111 " Treat it as default",
115 tmp = (struct rainfo *)malloc(sizeof(*ralist));
117 syslog(LOG_INFO, "<%s> %s: can't allocate enough memory",
121 memset(tmp, 0, sizeof(*tmp));
122 tmp->prefix.next = tmp->prefix.prev = &tmp->prefix;
124 tmp->route.next = tmp->route.prev = &tmp->route;
127 /* check if we are allowed to forward packets (if not determined) */
128 if (forwarding < 0) {
129 if ((forwarding = getinet6sysctl(IPV6CTL_FORWARDING)) < 0)
133 /* get interface information */
134 if (agetflag("nolladdr"))
138 if (tmp->advlinkopt) {
139 if ((tmp->sdl = if_nametosdl(intface)) == NULL) {
141 "<%s> can't get information of %s",
145 tmp->ifindex = tmp->sdl->sdl_index;
147 tmp->ifindex = if_nametoindex(intface);
148 strncpy(tmp->ifname, intface, sizeof(tmp->ifname));
149 if ((tmp->phymtu = if_getmtu(intface)) == 0) {
150 tmp->phymtu = IPV6_MMTU;
152 "<%s> can't get interface mtu of %s. Treat as %d",
153 __func__, intface, IPV6_MMTU);
157 * set router configuration variables.
159 MAYHAVE(val, "maxinterval", DEF_MAXRTRADVINTERVAL);
160 if (val < MIN_MAXINTERVAL || val > MAX_MAXINTERVAL) {
162 "<%s> maxinterval (%ld) on %s is invalid "
163 "(must be between %u and %u)", __func__, val,
164 intface, MIN_MAXINTERVAL, MAX_MAXINTERVAL);
167 tmp->maxinterval = (u_int)val;
168 MAYHAVE(val, "mininterval", tmp->maxinterval/3);
169 if (val < MIN_MININTERVAL || val > (tmp->maxinterval * 3) / 4) {
171 "<%s> mininterval (%ld) on %s is invalid "
172 "(must be between %d and %d)",
173 __func__, val, intface, MIN_MININTERVAL,
174 (tmp->maxinterval * 3) / 4);
177 tmp->mininterval = (u_int)val;
179 MAYHAVE(val, "chlim", DEF_ADVCURHOPLIMIT);
180 tmp->hoplimit = val & 0xff;
182 if ((flagstr = (char *)agetstr("raflags", &bp))) {
184 if (strchr(flagstr, 'm'))
185 val |= ND_RA_FLAG_MANAGED;
186 if (strchr(flagstr, 'o'))
187 val |= ND_RA_FLAG_OTHER;
188 if (strchr(flagstr, 'h'))
189 val |= ND_RA_FLAG_RTPREF_HIGH;
190 if (strchr(flagstr, 'l')) {
191 if ((val & ND_RA_FLAG_RTPREF_HIGH)) {
192 syslog(LOG_ERR, "<%s> the \'h\' and \'l\'"
193 " router flags are exclusive", __func__);
196 val |= ND_RA_FLAG_RTPREF_LOW;
199 MAYHAVE(val, "raflags", 0);
201 tmp->managedflg = val & ND_RA_FLAG_MANAGED;
202 tmp->otherflg = val & ND_RA_FLAG_OTHER;
203 #ifndef ND_RA_FLAG_RTPREF_MASK
204 #define ND_RA_FLAG_RTPREF_MASK 0x18 /* 00011000 */
205 #define ND_RA_FLAG_RTPREF_RSV 0x10 /* 00010000 */
207 tmp->rtpref = val & ND_RA_FLAG_RTPREF_MASK;
208 if (tmp->rtpref == ND_RA_FLAG_RTPREF_RSV) {
209 syslog(LOG_ERR, "<%s> invalid router preference (%02x) on %s",
210 __func__, tmp->rtpref, intface);
214 MAYHAVE(val, "rltime", tmp->maxinterval * 3);
215 if (val && (val < tmp->maxinterval || val > MAXROUTERLIFETIME)) {
217 "<%s> router lifetime (%ld) on %s is invalid "
218 "(must be 0 or between %d and %d)",
219 __func__, val, intface,
225 * Basically, hosts MUST NOT send Router Advertisement messages at any
226 * time (RFC 2461, Section 6.2.3). However, it would sometimes be
227 * useful to allow hosts to advertise some parameters such as prefix
228 * information and link MTU. Thus, we allow hosts to invoke rtadvd
229 * only when router lifetime (on every advertising interface) is
230 * explicitly set zero. (see also the above section)
232 if (val && forwarding == 0) {
234 "<%s> non zero router lifetime is specified for %s, "
235 "which must not be allowed for hosts. you must "
236 "change router lifetime or enable IPv6 forwarding.",
240 tmp->lifetime = val & 0xffff;
242 MAYHAVE(val, "rtime", DEF_ADVREACHABLETIME);
243 if (val < 0 || val > MAXREACHABLETIME) {
245 "<%s> reachable time (%ld) on %s is invalid "
246 "(must be no greater than %d)",
247 __func__, val, intface, MAXREACHABLETIME);
250 tmp->reachabletime = (u_int32_t)val;
252 MAYHAVE(val64, "retrans", DEF_ADVRETRANSTIMER);
253 if (val64 < 0 || val64 > 0xffffffff) {
254 syslog(LOG_ERR, "<%s> retrans time (%lld) on %s out of range",
255 __func__, (long long)val64, intface);
258 tmp->retranstimer = (u_int32_t)val64;
260 if (agetnum("hapref") != -1 || agetnum("hatime") != -1) {
262 "<%s> mobile-ip6 configuration not supported",
266 /* prefix information */
269 * This is an implementation specific parameter to consider
270 * link propagation delays and poorly synchronized clocks when
271 * checking consistency of advertised lifetimes.
273 MAYHAVE(val, "clockskew", 0);
274 tmp->clockskew = val;
277 for (i = -1; i < MAXPREFIX; i++) {
281 makeentry(entbuf, sizeof(entbuf), i, "addr");
282 addr = (char *)agetstr(entbuf, &bp);
286 /* allocate memory to store prefix information */
287 if ((pfx = malloc(sizeof(struct prefix))) == NULL) {
289 "<%s> can't allocate enough memory",
293 memset(pfx, 0, sizeof(*pfx));
295 /* link into chain */
296 insque(pfx, &tmp->prefix);
300 pfx->origin = PREFIX_FROM_CONFIG;
302 if (inet_pton(AF_INET6, addr, &pfx->prefix) != 1) {
304 "<%s> inet_pton failed for %s",
308 if (IN6_IS_ADDR_MULTICAST(&pfx->prefix)) {
310 "<%s> multicast prefix (%s) must "
311 "not be advertised on %s",
312 __func__, addr, intface);
315 if (IN6_IS_ADDR_LINKLOCAL(&pfx->prefix))
317 "<%s> link-local prefix (%s) will be"
319 __func__, addr, intface);
321 makeentry(entbuf, sizeof(entbuf), i, "prefixlen");
322 MAYHAVE(val, entbuf, 64);
323 if (val < 0 || val > 128) {
324 syslog(LOG_ERR, "<%s> prefixlen (%ld) for %s "
325 "on %s out of range",
326 __func__, val, addr, intface);
329 pfx->prefixlen = (int)val;
331 makeentry(entbuf, sizeof(entbuf), i, "pinfoflags");
332 if ((flagstr = (char *)agetstr(entbuf, &bp))) {
334 if (strchr(flagstr, 'l'))
335 val |= ND_OPT_PI_FLAG_ONLINK;
336 if (strchr(flagstr, 'a'))
337 val |= ND_OPT_PI_FLAG_AUTO;
340 (ND_OPT_PI_FLAG_ONLINK|ND_OPT_PI_FLAG_AUTO));
342 pfx->onlinkflg = val & ND_OPT_PI_FLAG_ONLINK;
343 pfx->autoconfflg = val & ND_OPT_PI_FLAG_AUTO;
345 makeentry(entbuf, sizeof(entbuf), i, "vltime");
346 MAYHAVE(val64, entbuf, DEF_ADVVALIDLIFETIME);
347 if (val64 < 0 || val64 > 0xffffffff) {
348 syslog(LOG_ERR, "<%s> vltime (%lld) for "
349 "%s/%d on %s is out of range",
350 __func__, (long long)val64,
351 addr, pfx->prefixlen, intface);
354 pfx->validlifetime = (u_int32_t)val64;
356 makeentry(entbuf, sizeof(entbuf), i, "vltimedecr");
357 if (agetflag(entbuf)) {
359 gettimeofday(&now, 0);
361 now.tv_sec + pfx->validlifetime;
364 makeentry(entbuf, sizeof(entbuf), i, "pltime");
365 MAYHAVE(val64, entbuf, DEF_ADVPREFERREDLIFETIME);
366 if (val64 < 0 || val64 > 0xffffffff) {
368 "<%s> pltime (%lld) for %s/%d on %s "
370 __func__, (long long)val64,
371 addr, pfx->prefixlen, intface);
374 pfx->preflifetime = (u_int32_t)val64;
376 makeentry(entbuf, sizeof(entbuf), i, "pltimedecr");
377 if (agetflag(entbuf)) {
379 gettimeofday(&now, 0);
381 now.tv_sec + pfx->preflifetime;
387 MAYHAVE(val, "mtu", 0);
388 if (val < 0 || val > 0xffffffff) {
390 "<%s> mtu (%ld) on %s out of range",
391 __func__, val, intface);
394 tmp->linkmtu = (u_int32_t)val;
395 if (tmp->linkmtu == 0) {
398 if ((mtustr = (char *)agetstr("mtu", &bp)) &&
399 strcmp(mtustr, "auto") == 0)
400 tmp->linkmtu = tmp->phymtu;
402 else if (tmp->linkmtu < IPV6_MMTU || tmp->linkmtu > tmp->phymtu) {
404 "<%s> advertised link mtu (%lu) on %s is invalid (must "
405 "be between least MTU (%d) and physical link MTU (%d)",
406 __func__, (unsigned long)tmp->linkmtu, intface,
407 IPV6_MMTU, tmp->phymtu);
411 #ifdef SIOCSIFINFO_IN6
413 struct in6_ndireq ndi;
416 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
417 syslog(LOG_ERR, "<%s> socket: %s", __func__,
421 memset(&ndi, 0, sizeof(ndi));
422 strncpy(ndi.ifname, intface, IFNAMSIZ);
423 if (ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&ndi) < 0) {
424 syslog(LOG_INFO, "<%s> ioctl:SIOCGIFINFO_IN6 at %s: %s",
425 __func__, intface, strerror(errno));
428 /* reflect the RA info to the host variables in kernel */
429 ndi.ndi.chlim = tmp->hoplimit;
430 ndi.ndi.retrans = tmp->retranstimer;
431 ndi.ndi.basereachable = tmp->reachabletime;
432 if (ioctl(s, SIOCSIFINFO_IN6, (caddr_t)&ndi) < 0) {
433 syslog(LOG_INFO, "<%s> ioctl:SIOCSIFINFO_IN6 at %s: %s",
434 __func__, intface, strerror(errno));
440 /* route information */
443 for (i = -1; i < MAXROUTE; i++) {
445 char entbuf[256], oentbuf[256];
447 makeentry(entbuf, sizeof(entbuf), i, "rtprefix");
448 addr = (char *)agetstr(entbuf, &bp);
450 makeentry(oentbuf, sizeof(oentbuf), i, "rtrprefix");
451 addr = (char *)agetstr(oentbuf, &bp);
453 fprintf(stderr, "%s was obsoleted. Use %s.\n",
460 /* allocate memory to store prefix information */
461 if ((rti = malloc(sizeof(struct rtinfo))) == NULL) {
463 "<%s> can't allocate enough memory",
467 memset(rti, 0, sizeof(*rti));
469 /* link into chain */
470 insque(rti, &tmp->route);
473 if (inet_pton(AF_INET6, addr, &rti->prefix) != 1) {
474 syslog(LOG_ERR, "<%s> inet_pton failed for %s",
480 * XXX: currently there's no restriction in route information
481 * prefix according to
482 * draft-ietf-ipngwg-router-selection-00.txt.
483 * However, I think the similar restriction be necessary.
485 MAYHAVE(val64, entbuf, DEF_ADVVALIDLIFETIME);
486 if (IN6_IS_ADDR_MULTICAST(&rti->prefix)) {
488 "<%s> multicast route (%s) must "
489 "not be advertised on %s",
490 __func__, addr, intface);
493 if (IN6_IS_ADDR_LINKLOCAL(&rti->prefix)) {
495 "<%s> link-local route (%s) will "
496 "be advertised on %s",
497 __func__, addr, intface);
502 makeentry(entbuf, sizeof(entbuf), i, "rtplen");
503 /* XXX: 256 is a magic number for compatibility check. */
504 MAYHAVE(val, entbuf, 256);
506 makeentry(oentbuf, sizeof(oentbuf), i, "rtrplen");
507 MAYHAVE(val, oentbuf, 256);
509 fprintf(stderr, "%s was obsoleted. Use %s.\n",
514 if (val < 0 || val > 128) {
515 syslog(LOG_ERR, "<%s> prefixlen (%ld) for %s on %s "
517 __func__, val, addr, intface);
520 rti->prefixlen = (int)val;
522 makeentry(entbuf, sizeof(entbuf), i, "rtflags");
523 if ((flagstr = (char *)agetstr(entbuf, &bp))) {
525 if (strchr(flagstr, 'h'))
526 val |= ND_RA_FLAG_RTPREF_HIGH;
527 if (strchr(flagstr, 'l')) {
528 if ((val & ND_RA_FLAG_RTPREF_HIGH)) {
530 "<%s> the \'h\' and \'l\' route"
531 " preferences are exclusive",
535 val |= ND_RA_FLAG_RTPREF_LOW;
538 MAYHAVE(val, entbuf, 256); /* XXX */
540 makeentry(oentbuf, sizeof(oentbuf), i, "rtrflags");
541 MAYHAVE(val, oentbuf, 256);
543 fprintf(stderr, "%s was obsoleted. Use %s.\n",
548 rti->rtpref = val & ND_RA_FLAG_RTPREF_MASK;
549 if (rti->rtpref == ND_RA_FLAG_RTPREF_RSV) {
550 syslog(LOG_ERR, "<%s> invalid route preference (%02x) "
552 __func__, rti->rtpref, addr,
553 rti->prefixlen, intface);
558 * Since the spec does not a default value, we should make
559 * this entry mandatory. However, FreeBSD 4.4 has shipped
560 * with this field being optional, we use the router lifetime
561 * as an ad-hoc default value with a warning message.
563 makeentry(entbuf, sizeof(entbuf), i, "rtltime");
564 MAYHAVE(val64, entbuf, -1);
566 makeentry(oentbuf, sizeof(oentbuf), i, "rtrltime");
567 MAYHAVE(val64, oentbuf, -1);
569 fprintf(stderr, "%s was obsoleted. Use %s.\n",
572 fprintf(stderr, "%s should be specified "
573 "for interface %s.\n",
575 val64 = tmp->lifetime;
578 if (val64 < 0 || val64 > 0xffffffff) {
579 syslog(LOG_ERR, "<%s> route lifetime (%lld) for "
580 "%s/%d on %s out of range", __func__,
581 (long long)val64, addr, rti->prefixlen, intface);
584 rti->ltime = (u_int32_t)val64;
592 /* construct the sending packet */
596 tmp->timer = rtadvd_add_timer(ra_timeout, ra_timer_update,
598 ra_timer_update((void *)tmp, &tmp->timer->tm);
599 rtadvd_set_timer(&tmp->timer->tm, tmp->timer);
603 get_prefix(struct rainfo *rai)
605 struct ifaddrs *ifap, *ifa;
608 u_char *p, *ep, *m, *lim;
609 u_char ntopbuf[INET6_ADDRSTRLEN];
611 if (getifaddrs(&ifap) < 0) {
613 "<%s> can't get interface addresses",
618 for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
621 if (strcmp(ifa->ifa_name, rai->ifname) != 0)
623 if (ifa->ifa_addr->sa_family != AF_INET6)
625 a = &((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr;
626 if (IN6_IS_ADDR_LINKLOCAL(a))
628 /* get prefix length */
629 m = (u_char *)&((struct sockaddr_in6 *)ifa->ifa_netmask)->sin6_addr;
630 lim = (u_char *)(ifa->ifa_netmask) + ifa->ifa_netmask->sa_len;
631 plen = prefixlen(m, lim);
632 if (plen <= 0 || plen > 128) {
633 syslog(LOG_ERR, "<%s> failed to get prefixlen "
634 "or prefix is invalid",
638 if (plen == 128) /* XXX */
640 if (find_prefix(rai, a, plen)) {
641 /* ignore a duplicated prefix. */
645 /* allocate memory to store prefix info. */
646 if ((pp = malloc(sizeof(*pp))) == NULL) {
648 "<%s> can't get allocate buffer for prefix",
652 memset(pp, 0, sizeof(*pp));
654 /* set prefix, sweep bits outside of prefixlen */
655 pp->prefixlen = plen;
656 memcpy(&pp->prefix, a, sizeof(*a));
657 p = (u_char *)&pp->prefix;
658 ep = (u_char *)(&pp->prefix + 1);
663 if (!inet_ntop(AF_INET6, &pp->prefix, ntopbuf,
665 syslog(LOG_ERR, "<%s> inet_ntop failed", __func__);
669 "<%s> add %s/%d to prefix list on %s",
670 __func__, ntopbuf, pp->prefixlen, rai->ifname);
672 /* set other fields with protocol defaults */
673 pp->validlifetime = DEF_ADVVALIDLIFETIME;
674 pp->preflifetime = DEF_ADVPREFERREDLIFETIME;
677 pp->origin = PREFIX_FROM_KERNEL;
680 /* link into chain */
681 insque(pp, &rai->prefix);
683 /* counter increment */
691 makeentry(buf, len, id, string)
699 strlcpy(buf, string, len);
701 snprintf(buf, len, "%s%d", string, id);
705 * Add a prefix to the list of specified interface and reconstruct
706 * the outgoing packet.
707 * The prefix must not be in the list.
708 * XXX: other parameters of the prefix (e.g. lifetime) shoule be
709 * able to be specified.
712 add_prefix(struct rainfo *rai, struct in6_prefixreq *ipr)
714 struct prefix *prefix;
715 u_char ntopbuf[INET6_ADDRSTRLEN];
717 if ((prefix = malloc(sizeof(*prefix))) == NULL) {
718 syslog(LOG_ERR, "<%s> memory allocation failed",
720 return; /* XXX: error or exit? */
722 memset(prefix, 0, sizeof(*prefix));
723 prefix->prefix = ipr->ipr_prefix.sin6_addr;
724 prefix->prefixlen = ipr->ipr_plen;
725 prefix->validlifetime = ipr->ipr_vltime;
726 prefix->preflifetime = ipr->ipr_pltime;
727 prefix->onlinkflg = ipr->ipr_raf_onlink;
728 prefix->autoconfflg = ipr->ipr_raf_auto;
729 prefix->origin = PREFIX_FROM_DYNAMIC;
731 insque(prefix, &rai->prefix);
732 prefix->rainfo = rai;
734 syslog(LOG_DEBUG, "<%s> new prefix %s/%d was added on %s",
735 __func__, inet_ntop(AF_INET6, &ipr->ipr_prefix.sin6_addr,
736 ntopbuf, INET6_ADDRSTRLEN),
737 ipr->ipr_plen, rai->ifname);
739 /* free the previous packet */
743 /* reconstruct the packet */
749 * Delete a prefix to the list of specified interface and reconstruct
750 * the outgoing packet.
751 * The prefix must be in the list.
754 delete_prefix(struct prefix *prefix)
756 u_char ntopbuf[INET6_ADDRSTRLEN];
757 struct rainfo *rai = prefix->rainfo;
760 syslog(LOG_DEBUG, "<%s> prefix %s/%d was deleted on %s",
761 __func__, inet_ntop(AF_INET6, &prefix->prefix,
762 ntopbuf, INET6_ADDRSTRLEN),
763 prefix->prefixlen, rai->ifname);
765 rtadvd_remove_timer(&prefix->timer);
771 invalidate_prefix(struct prefix *prefix)
773 u_char ntopbuf[INET6_ADDRSTRLEN];
775 struct rainfo *rai = prefix->rainfo;
777 if (prefix->timer) { /* sanity check */
779 "<%s> assumption failure: timer already exists",
784 syslog(LOG_DEBUG, "<%s> prefix %s/%d was invalidated on %s, "
785 "will expire in %ld seconds", __func__,
786 inet_ntop(AF_INET6, &prefix->prefix, ntopbuf, INET6_ADDRSTRLEN),
787 prefix->prefixlen, rai->ifname, (long)prefix_timo);
789 /* set the expiration timer */
790 prefix->timer = rtadvd_add_timer(prefix_timeout, NULL, prefix, NULL);
791 if (prefix->timer == NULL) {
792 syslog(LOG_ERR, "<%s> failed to add a timer for a prefix. "
793 "remove the prefix", __func__);
794 delete_prefix(prefix);
796 timo.tv_sec = prefix_timo;
798 rtadvd_set_timer(&timo, prefix->timer);
801 static struct rtadvd_timer *
802 prefix_timeout(void *arg)
804 struct prefix *prefix = (struct prefix *)arg;
806 delete_prefix(prefix);
812 update_prefix(struct prefix * prefix)
814 u_char ntopbuf[INET6_ADDRSTRLEN];
815 struct rainfo *rai = prefix->rainfo;
817 if (prefix->timer == NULL) { /* sanity check */
819 "<%s> assumption failure: timer does not exist",
824 syslog(LOG_DEBUG, "<%s> prefix %s/%d was re-enabled on %s",
825 __func__, inet_ntop(AF_INET6, &prefix->prefix, ntopbuf,
826 INET6_ADDRSTRLEN), prefix->prefixlen, rai->ifname);
828 /* stop the expiration timer */
829 rtadvd_remove_timer(&prefix->timer);
833 * Try to get an in6_prefixreq contents for a prefix which matches
834 * ipr->ipr_prefix and ipr->ipr_plen and belongs to
835 * the interface whose name is ipr->ipr_name[].
838 init_prefix(struct in6_prefixreq *ipr)
843 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
844 syslog(LOG_ERR, "<%s> socket: %s", __func__,
849 if (ioctl(s, SIOCGIFPREFIX_IN6, (caddr_t)ipr) < 0) {
850 syslog(LOG_INFO, "<%s> ioctl:SIOCGIFPREFIX %s", __func__,
853 ipr->ipr_vltime = DEF_ADVVALIDLIFETIME;
854 ipr->ipr_pltime = DEF_ADVPREFERREDLIFETIME;
855 ipr->ipr_raf_onlink = 1;
856 ipr->ipr_raf_auto = 1;
857 /* omit other field initialization */
859 else if (ipr->ipr_origin < PR_ORIG_RR) {
860 u_char ntopbuf[INET6_ADDRSTRLEN];
862 syslog(LOG_WARNING, "<%s> Added prefix(%s)'s origin %d is"
863 "lower than PR_ORIG_RR(router renumbering)."
864 "This should not happen if I am router", __func__,
865 inet_ntop(AF_INET6, &ipr->ipr_prefix.sin6_addr, ntopbuf,
866 sizeof(ntopbuf)), ipr->ipr_origin);
874 ipr->ipr_vltime = DEF_ADVVALIDLIFETIME;
875 ipr->ipr_pltime = DEF_ADVPREFERREDLIFETIME;
876 ipr->ipr_raf_onlink = 1;
877 ipr->ipr_raf_auto = 1;
883 make_prefix(struct rainfo *rai, int ifindex, struct in6_addr *addr, int plen)
885 struct in6_prefixreq ipr;
887 memset(&ipr, 0, sizeof(ipr));
888 if (if_indextoname(ifindex, ipr.ipr_name) == NULL) {
889 syslog(LOG_ERR, "<%s> Prefix added interface No.%d doesn't"
890 "exist. This should not happen! %s", __func__,
891 ifindex, strerror(errno));
894 ipr.ipr_prefix.sin6_len = sizeof(ipr.ipr_prefix);
895 ipr.ipr_prefix.sin6_family = AF_INET6;
896 ipr.ipr_prefix.sin6_addr = *addr;
899 if (init_prefix(&ipr))
900 return; /* init failed by some error */
901 add_prefix(rai, &ipr);
905 make_packet(struct rainfo *rainfo)
907 size_t packlen, lladdroptlen = 0;
909 struct nd_router_advert *ra;
910 struct nd_opt_prefix_info *ndopt_pi;
911 struct nd_opt_mtu *ndopt_mtu;
913 struct nd_opt_route_info *ndopt_rti;
918 /* calculate total length */
919 packlen = sizeof(struct nd_router_advert);
920 if (rainfo->advlinkopt) {
921 if ((lladdroptlen = lladdropt_length(rainfo->sdl)) == 0) {
923 "<%s> link-layer address option has"
924 " null length on %s. Treat as not included.",
925 __func__, rainfo->ifname);
926 rainfo->advlinkopt = 0;
928 packlen += lladdroptlen;
931 packlen += sizeof(struct nd_opt_prefix_info) * rainfo->pfxs;
933 packlen += sizeof(struct nd_opt_mtu);
935 for (rti = rainfo->route.next; rti != &rainfo->route; rti = rti->next)
936 packlen += sizeof(struct nd_opt_route_info) +
937 ((rti->prefixlen + 0x3f) >> 6) * 8;
940 /* allocate memory for the packet */
941 if ((buf = malloc(packlen)) == NULL) {
943 "<%s> can't get enough memory for an RA packet",
947 if (rainfo->ra_data) {
948 /* free the previous packet */
949 free(rainfo->ra_data);
950 rainfo->ra_data = NULL;
952 rainfo->ra_data = buf;
953 /* XXX: what if packlen > 576? */
954 rainfo->ra_datalen = packlen;
957 * construct the packet
959 ra = (struct nd_router_advert *)buf;
960 ra->nd_ra_type = ND_ROUTER_ADVERT;
963 ra->nd_ra_curhoplimit = (u_int8_t)(0xff & rainfo->hoplimit);
964 ra->nd_ra_flags_reserved = 0; /* just in case */
966 * XXX: the router preference field, which is a 2-bit field, should be
967 * initialized before other fields.
969 ra->nd_ra_flags_reserved = 0xff & rainfo->rtpref;
970 ra->nd_ra_flags_reserved |=
971 rainfo->managedflg ? ND_RA_FLAG_MANAGED : 0;
972 ra->nd_ra_flags_reserved |=
973 rainfo->otherflg ? ND_RA_FLAG_OTHER : 0;
974 ra->nd_ra_router_lifetime = htons(rainfo->lifetime);
975 ra->nd_ra_reachable = htonl(rainfo->reachabletime);
976 ra->nd_ra_retransmit = htonl(rainfo->retranstimer);
979 if (rainfo->advlinkopt) {
980 lladdropt_fill(rainfo->sdl, (struct nd_opt_hdr *)buf);
984 if (rainfo->linkmtu) {
985 ndopt_mtu = (struct nd_opt_mtu *)buf;
986 ndopt_mtu->nd_opt_mtu_type = ND_OPT_MTU;
987 ndopt_mtu->nd_opt_mtu_len = 1;
988 ndopt_mtu->nd_opt_mtu_reserved = 0;
989 ndopt_mtu->nd_opt_mtu_mtu = htonl(rainfo->linkmtu);
990 buf += sizeof(struct nd_opt_mtu);
993 for (pfx = rainfo->prefix.next;
994 pfx != &rainfo->prefix; pfx = pfx->next) {
995 u_int32_t vltime, pltime;
998 ndopt_pi = (struct nd_opt_prefix_info *)buf;
999 ndopt_pi->nd_opt_pi_type = ND_OPT_PREFIX_INFORMATION;
1000 ndopt_pi->nd_opt_pi_len = 4;
1001 ndopt_pi->nd_opt_pi_prefix_len = pfx->prefixlen;
1002 ndopt_pi->nd_opt_pi_flags_reserved = 0;
1004 ndopt_pi->nd_opt_pi_flags_reserved |=
1005 ND_OPT_PI_FLAG_ONLINK;
1006 if (pfx->autoconfflg)
1007 ndopt_pi->nd_opt_pi_flags_reserved |=
1008 ND_OPT_PI_FLAG_AUTO;
1012 if (pfx->vltimeexpire || pfx->pltimeexpire)
1013 gettimeofday(&now, NULL);
1014 if (pfx->vltimeexpire == 0)
1015 vltime = pfx->validlifetime;
1017 vltime = (pfx->vltimeexpire > now.tv_sec) ?
1018 pfx->vltimeexpire - now.tv_sec : 0;
1023 if (pfx->pltimeexpire == 0)
1024 pltime = pfx->preflifetime;
1026 pltime = (pfx->pltimeexpire > now.tv_sec) ?
1027 pfx->pltimeexpire - now.tv_sec : 0;
1029 if (vltime < pltime) {
1031 * this can happen if vltime is decrement but pltime
1036 ndopt_pi->nd_opt_pi_valid_time = htonl(vltime);
1037 ndopt_pi->nd_opt_pi_preferred_time = htonl(pltime);
1038 ndopt_pi->nd_opt_pi_reserved2 = 0;
1039 ndopt_pi->nd_opt_pi_prefix = pfx->prefix;
1041 buf += sizeof(struct nd_opt_prefix_info);
1045 for (rti = rainfo->route.next; rti != &rainfo->route; rti = rti->next) {
1046 u_int8_t psize = (rti->prefixlen + 0x3f) >> 6;
1048 ndopt_rti = (struct nd_opt_route_info *)buf;
1049 ndopt_rti->nd_opt_rti_type = ND_OPT_ROUTE_INFO;
1050 ndopt_rti->nd_opt_rti_len = 1 + psize;
1051 ndopt_rti->nd_opt_rti_prefixlen = rti->prefixlen;
1052 ndopt_rti->nd_opt_rti_flags = 0xff & rti->rtpref;
1053 ndopt_rti->nd_opt_rti_lifetime = htonl(rti->ltime);
1054 memcpy(ndopt_rti + 1, &rti->prefix, psize * 8);
1055 buf += sizeof(struct nd_opt_route_info) + psize * 8;
1063 getinet6sysctl(int code)
1065 int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, 0 };
1070 size = sizeof(value);
1071 if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), &value, &size, NULL, 0)
1073 syslog(LOG_ERR, "<%s>: failed to get ip6 sysctl(%d): %s",