2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the project nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * $KAME: nd6_rtr.c,v 1.111 2001/04/27 01:37:15 jinmei Exp $
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
36 #include "opt_inet6.h"
38 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/malloc.h>
42 #include <sys/socket.h>
43 #include <sys/sockio.h>
45 #include <sys/kernel.h>
47 #include <sys/errno.h>
48 #include <sys/rwlock.h>
49 #include <sys/syslog.h>
50 #include <sys/queue.h>
51 #include <sys/vimage.h>
54 #include <net/if_types.h>
55 #include <net/if_dl.h>
56 #include <net/route.h>
57 #include <net/radix.h>
60 #include <netinet/in.h>
61 #include <net/if_llatbl.h>
62 #include <netinet6/in6_var.h>
63 #include <netinet6/in6_ifattach.h>
64 #include <netinet/ip6.h>
65 #include <netinet6/ip6_var.h>
66 #include <netinet6/nd6.h>
67 #include <netinet/icmp6.h>
68 #include <netinet6/scope6_var.h>
69 #include <netinet6/vinet6.h>
71 static int rtpref(struct nd_defrouter *);
72 static struct nd_defrouter *defrtrlist_update(struct nd_defrouter *);
73 static int prelist_update __P((struct nd_prefixctl *, struct nd_defrouter *,
75 static struct in6_ifaddr *in6_ifadd(struct nd_prefixctl *, int);
76 static struct nd_pfxrouter *pfxrtr_lookup __P((struct nd_prefix *,
77 struct nd_defrouter *));
78 static void pfxrtr_add(struct nd_prefix *, struct nd_defrouter *);
79 static void pfxrtr_del(struct nd_pfxrouter *);
80 static struct nd_pfxrouter *find_pfxlist_reachable_router
82 static void defrouter_delreq(struct nd_defrouter *);
83 static void nd6_rtmsg(int, struct rtentry *);
85 static int in6_init_prefix_ltimes(struct nd_prefix *);
86 static void in6_init_address_ltimes __P((struct nd_prefix *,
87 struct in6_addrlifetime *));
89 static int rt6_deleteroute(struct radix_node *, void *);
92 extern int nd6_recalc_reachtm_interval;
94 static struct ifnet *nd6_defifp;
98 int ip6_desync_factor;
99 u_int32_t ip6_temp_preferred_lifetime;
100 u_int32_t ip6_temp_valid_lifetime;
101 int ip6_temp_regen_advance;
104 /* RTPREF_MEDIUM has to be 0! */
105 #define RTPREF_HIGH 1
106 #define RTPREF_MEDIUM 0
107 #define RTPREF_LOW (-1)
108 #define RTPREF_RESERVED (-2)
109 #define RTPREF_INVALID (-3) /* internal */
112 * Receive Router Solicitation Message - just for routers.
113 * Router solicitation/advertisement is mostly managed by userland program
114 * (rtadvd) so here we have no function like nd6_ra_output().
119 nd6_rs_input(struct mbuf *m, int off, int icmp6len)
121 INIT_VNET_INET6(curvnet);
122 struct ifnet *ifp = m->m_pkthdr.rcvif;
123 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
124 struct nd_router_solicit *nd_rs;
125 struct in6_addr saddr6 = ip6->ip6_src;
128 union nd_opts ndopts;
129 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
131 /* If I'm not a router, ignore it. */
132 if (V_ip6_accept_rtadv != 0 || V_ip6_forwarding != 1)
136 if (ip6->ip6_hlim != 255) {
138 "nd6_rs_input: invalid hlim (%d) from %s to %s on %s\n",
139 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
140 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
145 * Don't update the neighbor cache, if src = ::.
146 * This indicates that the src has no IP address assigned yet.
148 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
151 #ifndef PULLDOWN_TEST
152 IP6_EXTHDR_CHECK(m, off, icmp6len,);
153 nd_rs = (struct nd_router_solicit *)((caddr_t)ip6 + off);
155 IP6_EXTHDR_GET(nd_rs, struct nd_router_solicit *, m, off, icmp6len);
157 ICMP6STAT_INC(icp6s_tooshort);
162 icmp6len -= sizeof(*nd_rs);
163 nd6_option_init(nd_rs + 1, icmp6len, &ndopts);
164 if (nd6_options(&ndopts) < 0) {
166 "nd6_rs_input: invalid ND option, ignored\n"));
167 /* nd6_options have incremented stats */
171 if (ndopts.nd_opts_src_lladdr) {
172 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
173 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
176 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
178 "nd6_rs_input: lladdrlen mismatch for %s "
179 "(if %d, RS packet %d)\n",
180 ip6_sprintf(ip6bufs, &saddr6),
181 ifp->if_addrlen, lladdrlen - 2));
185 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_SOLICIT, 0);
192 ICMP6STAT_INC(icp6s_badrs);
197 * Receive Router Advertisement Message.
200 * TODO: on-link bit on prefix information
201 * TODO: ND_RA_FLAG_{OTHER,MANAGED} processing
204 nd6_ra_input(struct mbuf *m, int off, int icmp6len)
206 INIT_VNET_INET6(curvnet);
207 struct ifnet *ifp = m->m_pkthdr.rcvif;
208 struct nd_ifinfo *ndi = ND_IFINFO(ifp);
209 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
210 struct nd_router_advert *nd_ra;
211 struct in6_addr saddr6 = ip6->ip6_src;
213 union nd_opts ndopts;
214 struct nd_defrouter *dr;
215 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
218 * We only accept RAs only when
219 * the system-wide variable allows the acceptance, and
220 * per-interface variable allows RAs on the receiving interface.
222 if (V_ip6_accept_rtadv == 0)
224 if (!(ndi->flags & ND6_IFF_ACCEPT_RTADV))
227 if (ip6->ip6_hlim != 255) {
229 "nd6_ra_input: invalid hlim (%d) from %s to %s on %s\n",
230 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
231 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
235 if (!IN6_IS_ADDR_LINKLOCAL(&saddr6)) {
237 "nd6_ra_input: src %s is not link-local\n",
238 ip6_sprintf(ip6bufs, &saddr6)));
242 #ifndef PULLDOWN_TEST
243 IP6_EXTHDR_CHECK(m, off, icmp6len,);
244 nd_ra = (struct nd_router_advert *)((caddr_t)ip6 + off);
246 IP6_EXTHDR_GET(nd_ra, struct nd_router_advert *, m, off, icmp6len);
248 ICMP6STAT_INC(icp6s_tooshort);
253 icmp6len -= sizeof(*nd_ra);
254 nd6_option_init(nd_ra + 1, icmp6len, &ndopts);
255 if (nd6_options(&ndopts) < 0) {
257 "nd6_ra_input: invalid ND option, ignored\n"));
258 /* nd6_options have incremented stats */
263 struct nd_defrouter dr0;
264 u_int32_t advreachable = nd_ra->nd_ra_reachable;
266 /* remember if this is a multicasted advertisement */
267 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst))
270 bzero(&dr0, sizeof(dr0));
272 dr0.flags = nd_ra->nd_ra_flags_reserved;
273 dr0.rtlifetime = ntohs(nd_ra->nd_ra_router_lifetime);
274 dr0.expire = time_second + dr0.rtlifetime;
276 /* unspecified or not? (RFC 2461 6.3.4) */
278 advreachable = ntohl(advreachable);
279 if (advreachable <= MAX_REACHABLE_TIME &&
280 ndi->basereachable != advreachable) {
281 ndi->basereachable = advreachable;
282 ndi->reachable = ND_COMPUTE_RTIME(ndi->basereachable);
283 ndi->recalctm = V_nd6_recalc_reachtm_interval; /* reset */
286 if (nd_ra->nd_ra_retransmit)
287 ndi->retrans = ntohl(nd_ra->nd_ra_retransmit);
288 if (nd_ra->nd_ra_curhoplimit)
289 ndi->chlim = nd_ra->nd_ra_curhoplimit;
290 dr = defrtrlist_update(&dr0);
296 if (ndopts.nd_opts_pi) {
297 struct nd_opt_hdr *pt;
298 struct nd_opt_prefix_info *pi = NULL;
299 struct nd_prefixctl pr;
301 for (pt = (struct nd_opt_hdr *)ndopts.nd_opts_pi;
302 pt <= (struct nd_opt_hdr *)ndopts.nd_opts_pi_end;
303 pt = (struct nd_opt_hdr *)((caddr_t)pt +
304 (pt->nd_opt_len << 3))) {
305 if (pt->nd_opt_type != ND_OPT_PREFIX_INFORMATION)
307 pi = (struct nd_opt_prefix_info *)pt;
309 if (pi->nd_opt_pi_len != 4) {
311 "nd6_ra_input: invalid option "
312 "len %d for prefix information option, "
313 "ignored\n", pi->nd_opt_pi_len));
317 if (128 < pi->nd_opt_pi_prefix_len) {
319 "nd6_ra_input: invalid prefix "
320 "len %d for prefix information option, "
321 "ignored\n", pi->nd_opt_pi_prefix_len));
325 if (IN6_IS_ADDR_MULTICAST(&pi->nd_opt_pi_prefix)
326 || IN6_IS_ADDR_LINKLOCAL(&pi->nd_opt_pi_prefix)) {
328 "nd6_ra_input: invalid prefix "
331 &pi->nd_opt_pi_prefix)));
335 bzero(&pr, sizeof(pr));
336 pr.ndpr_prefix.sin6_family = AF_INET6;
337 pr.ndpr_prefix.sin6_len = sizeof(pr.ndpr_prefix);
338 pr.ndpr_prefix.sin6_addr = pi->nd_opt_pi_prefix;
339 pr.ndpr_ifp = (struct ifnet *)m->m_pkthdr.rcvif;
341 pr.ndpr_raf_onlink = (pi->nd_opt_pi_flags_reserved &
342 ND_OPT_PI_FLAG_ONLINK) ? 1 : 0;
343 pr.ndpr_raf_auto = (pi->nd_opt_pi_flags_reserved &
344 ND_OPT_PI_FLAG_AUTO) ? 1 : 0;
345 pr.ndpr_plen = pi->nd_opt_pi_prefix_len;
346 pr.ndpr_vltime = ntohl(pi->nd_opt_pi_valid_time);
347 pr.ndpr_pltime = ntohl(pi->nd_opt_pi_preferred_time);
348 (void)prelist_update(&pr, dr, m, mcast);
355 if (ndopts.nd_opts_mtu && ndopts.nd_opts_mtu->nd_opt_mtu_len == 1) {
359 mtu = (u_long)ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu);
362 if (mtu < IPV6_MMTU) {
363 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu option "
364 "mtu=%lu sent from %s, ignoring\n",
365 mtu, ip6_sprintf(ip6bufs, &ip6->ip6_src)));
370 maxmtu = (ndi->maxmtu && ndi->maxmtu < ifp->if_mtu)
371 ? ndi->maxmtu : ifp->if_mtu;
373 int change = (ndi->linkmtu != mtu);
376 if (change) /* in6_maxmtu may change */
379 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu "
380 "mtu=%lu sent from %s; "
381 "exceeds maxmtu %lu, ignoring\n",
382 mtu, ip6_sprintf(ip6bufs, &ip6->ip6_src), maxmtu));
389 * Source link layer address
395 if (ndopts.nd_opts_src_lladdr) {
396 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
397 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
400 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
402 "nd6_ra_input: lladdrlen mismatch for %s "
403 "(if %d, RA packet %d)\n", ip6_sprintf(ip6bufs, &saddr6),
404 ifp->if_addrlen, lladdrlen - 2));
408 nd6_cache_lladdr(ifp, &saddr6, lladdr,
409 lladdrlen, ND_ROUTER_ADVERT, 0);
412 * Installing a link-layer address might change the state of the
413 * router's neighbor cache, which might also affect our on-link
414 * detection of adveritsed prefixes.
416 pfxlist_onlink_check();
424 ICMP6STAT_INC(icp6s_badra);
429 * default router list proccessing sub routines
432 /* tell the change to user processes watching the routing socket. */
434 nd6_rtmsg(int cmd, struct rtentry *rt)
436 struct rt_addrinfo info;
440 bzero((caddr_t)&info, sizeof(info));
441 info.rti_info[RTAX_DST] = rt_key(rt);
442 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
443 info.rti_info[RTAX_NETMASK] = rt_mask(rt);
447 ifa = TAILQ_FIRST(&ifp->if_addrhead);
448 info.rti_info[RTAX_IFP] = ifa->ifa_addr;
451 info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr;
455 rt_missmsg(cmd, &info, rt->rt_flags, 0);
461 defrouter_addreq(struct nd_defrouter *new)
463 struct sockaddr_in6 def, mask, gate;
464 struct rtentry *newrt = NULL;
468 bzero(&def, sizeof(def));
469 bzero(&mask, sizeof(mask));
470 bzero(&gate, sizeof(gate));
472 def.sin6_len = mask.sin6_len = gate.sin6_len =
473 sizeof(struct sockaddr_in6);
474 def.sin6_family = gate.sin6_family = AF_INET6;
475 gate.sin6_addr = new->rtaddr;
478 error = rtrequest(RTM_ADD, (struct sockaddr *)&def,
479 (struct sockaddr *)&gate, (struct sockaddr *)&mask,
480 RTF_GATEWAY, &newrt);
482 nd6_rtmsg(RTM_ADD, newrt); /* tell user process */
491 struct nd_defrouter *
492 defrouter_lookup(struct in6_addr *addr, struct ifnet *ifp)
494 INIT_VNET_INET6(ifp->if_vnet);
495 struct nd_defrouter *dr;
497 for (dr = TAILQ_FIRST(&V_nd_defrouter); dr;
498 dr = TAILQ_NEXT(dr, dr_entry)) {
499 if (dr->ifp == ifp && IN6_ARE_ADDR_EQUAL(addr, &dr->rtaddr))
503 return (NULL); /* search failed */
507 * Remove the default route for a given router.
508 * This is just a subroutine function for defrouter_select(), and should
509 * not be called from anywhere else.
512 defrouter_delreq(struct nd_defrouter *dr)
514 struct sockaddr_in6 def, mask, gate;
515 struct rtentry *oldrt = NULL;
517 bzero(&def, sizeof(def));
518 bzero(&mask, sizeof(mask));
519 bzero(&gate, sizeof(gate));
521 def.sin6_len = mask.sin6_len = gate.sin6_len =
522 sizeof(struct sockaddr_in6);
523 def.sin6_family = gate.sin6_family = AF_INET6;
524 gate.sin6_addr = dr->rtaddr;
526 rtrequest(RTM_DELETE, (struct sockaddr *)&def,
527 (struct sockaddr *)&gate,
528 (struct sockaddr *)&mask, RTF_GATEWAY, &oldrt);
530 nd6_rtmsg(RTM_DELETE, oldrt);
538 * remove all default routes from default router list
541 defrouter_reset(void)
543 INIT_VNET_INET6(curvnet);
544 struct nd_defrouter *dr;
546 for (dr = TAILQ_FIRST(&V_nd_defrouter); dr;
547 dr = TAILQ_NEXT(dr, dr_entry))
548 defrouter_delreq(dr);
551 * XXX should we also nuke any default routers in the kernel, by
552 * going through them by rtalloc1()?
557 defrtrlist_del(struct nd_defrouter *dr)
559 INIT_VNET_INET6(curvnet);
560 struct nd_defrouter *deldr = NULL;
561 struct nd_prefix *pr;
564 * Flush all the routing table entries that use the router
567 if (!V_ip6_forwarding && V_ip6_accept_rtadv) /* XXX: better condition? */
568 rt6_flush(&dr->rtaddr, dr->ifp);
572 defrouter_delreq(dr);
574 TAILQ_REMOVE(&V_nd_defrouter, dr, dr_entry);
577 * Also delete all the pointers to the router in each prefix lists.
579 for (pr = V_nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
580 struct nd_pfxrouter *pfxrtr;
581 if ((pfxrtr = pfxrtr_lookup(pr, dr)) != NULL)
584 pfxlist_onlink_check();
587 * If the router is the primary one, choose a new one.
588 * Note that defrouter_select() will remove the current gateway
589 * from the routing table.
598 * Default Router Selection according to Section 6.3.6 of RFC 2461 and
599 * draft-ietf-ipngwg-router-selection:
600 * 1) Routers that are reachable or probably reachable should be preferred.
601 * If we have more than one (probably) reachable router, prefer ones
602 * with the highest router preference.
603 * 2) When no routers on the list are known to be reachable or
604 * probably reachable, routers SHOULD be selected in a round-robin
605 * fashion, regardless of router preference values.
606 * 3) If the Default Router List is empty, assume that all
607 * destinations are on-link.
609 * We assume nd_defrouter is sorted by router preference value.
610 * Since the code below covers both with and without router preference cases,
611 * we do not need to classify the cases by ifdef.
613 * At this moment, we do not try to install more than one default router,
614 * even when the multipath routing is available, because we're not sure about
615 * the benefits for stub hosts comparing to the risk of making the code
616 * complicated and the possibility of introducing bugs.
619 defrouter_select(void)
621 INIT_VNET_INET6(curvnet);
623 struct nd_defrouter *dr, *selected_dr = NULL, *installed_dr = NULL;
624 struct llentry *ln = NULL;
627 * This function should be called only when acting as an autoconfigured
628 * host. Although the remaining part of this function is not effective
629 * if the node is not an autoconfigured host, we explicitly exclude
630 * such cases here for safety.
632 if (V_ip6_forwarding || !V_ip6_accept_rtadv) {
634 "defrouter_select: called unexpectedly (forwarding=%d, "
635 "accept_rtadv=%d)\n", V_ip6_forwarding, V_ip6_accept_rtadv));
641 * Let's handle easy case (3) first:
642 * If default router list is empty, there's nothing to be done.
644 if (!TAILQ_FIRST(&V_nd_defrouter)) {
650 * Search for a (probably) reachable router from the list.
651 * We just pick up the first reachable one (if any), assuming that
652 * the ordering rule of the list described in defrtrlist_update().
654 for (dr = TAILQ_FIRST(&V_nd_defrouter); dr;
655 dr = TAILQ_NEXT(dr, dr_entry)) {
656 IF_AFDATA_LOCK(dr->ifp);
657 if (selected_dr == NULL &&
658 (ln = nd6_lookup(&dr->rtaddr, 0, dr->ifp)) &&
659 ND6_IS_LLINFO_PROBREACH(ln)) {
662 IF_AFDATA_UNLOCK(dr->ifp);
668 if (dr->installed && installed_dr == NULL)
670 else if (dr->installed && installed_dr) {
671 /* this should not happen. warn for diagnosis. */
672 log(LOG_ERR, "defrouter_select: more than one router"
677 * If none of the default routers was found to be reachable,
678 * round-robin the list regardless of preference.
679 * Otherwise, if we have an installed router, check if the selected
680 * (reachable) router should really be preferred to the installed one.
681 * We only prefer the new router when the old one is not reachable
682 * or when the new one has a really higher preference value.
684 if (selected_dr == NULL) {
685 if (installed_dr == NULL || !TAILQ_NEXT(installed_dr, dr_entry))
686 selected_dr = TAILQ_FIRST(&V_nd_defrouter);
688 selected_dr = TAILQ_NEXT(installed_dr, dr_entry);
689 } else if (installed_dr) {
690 IF_AFDATA_LOCK(installed_dr->ifp);
691 if ((ln = nd6_lookup(&installed_dr->rtaddr, 0, installed_dr->ifp)) &&
692 ND6_IS_LLINFO_PROBREACH(ln) &&
693 rtpref(selected_dr) <= rtpref(installed_dr)) {
694 selected_dr = installed_dr;
696 IF_AFDATA_UNLOCK(installed_dr->ifp);
702 * If the selected router is different than the installed one,
703 * remove the installed router and install the selected one.
704 * Note that the selected router is never NULL here.
706 if (installed_dr != selected_dr) {
708 defrouter_delreq(installed_dr);
709 defrouter_addreq(selected_dr);
717 * for default router selection
718 * regards router-preference field as a 2-bit signed integer
721 rtpref(struct nd_defrouter *dr)
723 switch (dr->flags & ND_RA_FLAG_RTPREF_MASK) {
724 case ND_RA_FLAG_RTPREF_HIGH:
725 return (RTPREF_HIGH);
726 case ND_RA_FLAG_RTPREF_MEDIUM:
727 case ND_RA_FLAG_RTPREF_RSV:
728 return (RTPREF_MEDIUM);
729 case ND_RA_FLAG_RTPREF_LOW:
733 * This case should never happen. If it did, it would mean a
734 * serious bug of kernel internal. We thus always bark here.
735 * Or, can we even panic?
737 log(LOG_ERR, "rtpref: impossible RA flag %x\n", dr->flags);
738 return (RTPREF_INVALID);
743 static struct nd_defrouter *
744 defrtrlist_update(struct nd_defrouter *new)
746 INIT_VNET_INET6(curvnet);
747 struct nd_defrouter *dr, *n;
750 if ((dr = defrouter_lookup(&new->rtaddr, new->ifp)) != NULL) {
752 if (new->rtlifetime == 0) {
756 int oldpref = rtpref(dr);
759 dr->flags = new->flags; /* xxx flag check */
760 dr->rtlifetime = new->rtlifetime;
761 dr->expire = new->expire;
764 * If the preference does not change, there's no need
765 * to sort the entries.
767 if (rtpref(new) == oldpref) {
773 * preferred router may be changed, so relocate
775 * XXX: calling TAILQ_REMOVE directly is a bad manner.
776 * However, since defrtrlist_del() has many side
777 * effects, we intentionally do so here.
778 * defrouter_select() below will handle routing
781 TAILQ_REMOVE(&V_nd_defrouter, dr, dr_entry);
789 /* entry does not exist */
790 if (new->rtlifetime == 0) {
795 n = (struct nd_defrouter *)malloc(sizeof(*n), M_IP6NDP, M_NOWAIT);
800 bzero(n, sizeof(*n));
805 * Insert the new router in the Default Router List;
806 * The Default Router List should be in the descending order
807 * of router-preferece. Routers with the same preference are
808 * sorted in the arriving time order.
811 /* insert at the end of the group */
812 for (dr = TAILQ_FIRST(&V_nd_defrouter); dr;
813 dr = TAILQ_NEXT(dr, dr_entry)) {
814 if (rtpref(n) > rtpref(dr))
818 TAILQ_INSERT_BEFORE(dr, n, dr_entry);
820 TAILQ_INSERT_TAIL(&V_nd_defrouter, n, dr_entry);
829 static struct nd_pfxrouter *
830 pfxrtr_lookup(struct nd_prefix *pr, struct nd_defrouter *dr)
832 struct nd_pfxrouter *search;
834 for (search = pr->ndpr_advrtrs.lh_first; search; search = search->pfr_next) {
835 if (search->router == dr)
843 pfxrtr_add(struct nd_prefix *pr, struct nd_defrouter *dr)
845 struct nd_pfxrouter *new;
847 new = (struct nd_pfxrouter *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT);
850 bzero(new, sizeof(*new));
853 LIST_INSERT_HEAD(&pr->ndpr_advrtrs, new, pfr_entry);
855 pfxlist_onlink_check();
859 pfxrtr_del(struct nd_pfxrouter *pfr)
861 LIST_REMOVE(pfr, pfr_entry);
866 nd6_prefix_lookup(struct nd_prefixctl *key)
868 INIT_VNET_INET6(curvnet);
869 struct nd_prefix *search;
871 for (search = V_nd_prefix.lh_first;
872 search; search = search->ndpr_next) {
873 if (key->ndpr_ifp == search->ndpr_ifp &&
874 key->ndpr_plen == search->ndpr_plen &&
875 in6_are_prefix_equal(&key->ndpr_prefix.sin6_addr,
876 &search->ndpr_prefix.sin6_addr, key->ndpr_plen)) {
885 nd6_prelist_add(struct nd_prefixctl *pr, struct nd_defrouter *dr,
886 struct nd_prefix **newp)
888 INIT_VNET_INET6(curvnet);
889 struct nd_prefix *new = NULL;
892 char ip6buf[INET6_ADDRSTRLEN];
894 new = (struct nd_prefix *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT);
897 bzero(new, sizeof(*new));
898 new->ndpr_ifp = pr->ndpr_ifp;
899 new->ndpr_prefix = pr->ndpr_prefix;
900 new->ndpr_plen = pr->ndpr_plen;
901 new->ndpr_vltime = pr->ndpr_vltime;
902 new->ndpr_pltime = pr->ndpr_pltime;
903 new->ndpr_flags = pr->ndpr_flags;
904 if ((error = in6_init_prefix_ltimes(new)) != 0) {
908 new->ndpr_lastupdate = time_second;
913 LIST_INIT(&new->ndpr_advrtrs);
914 in6_prefixlen2mask(&new->ndpr_mask, new->ndpr_plen);
915 /* make prefix in the canonical form */
916 for (i = 0; i < 4; i++)
917 new->ndpr_prefix.sin6_addr.s6_addr32[i] &=
918 new->ndpr_mask.s6_addr32[i];
921 /* link ndpr_entry to nd_prefix list */
922 LIST_INSERT_HEAD(&V_nd_prefix, new, ndpr_entry);
925 /* ND_OPT_PI_FLAG_ONLINK processing */
926 if (new->ndpr_raf_onlink) {
929 if ((e = nd6_prefix_onlink(new)) != 0) {
930 nd6log((LOG_ERR, "nd6_prelist_add: failed to make "
931 "the prefix %s/%d on-link on %s (errno=%d)\n",
932 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
933 pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
934 /* proceed anyway. XXX: is it correct? */
945 prelist_remove(struct nd_prefix *pr)
947 INIT_VNET_INET6(curvnet);
948 struct nd_pfxrouter *pfr, *next;
950 char ip6buf[INET6_ADDRSTRLEN];
952 /* make sure to invalidate the prefix until it is really freed. */
957 * Though these flags are now meaningless, we'd rather keep the value
958 * of pr->ndpr_raf_onlink and pr->ndpr_raf_auto not to confuse users
959 * when executing "ndp -p".
962 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0 &&
963 (e = nd6_prefix_offlink(pr)) != 0) {
964 nd6log((LOG_ERR, "prelist_remove: failed to make %s/%d offlink "
966 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
967 pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
968 /* what should we do? */
971 if (pr->ndpr_refcnt > 0)
972 return; /* notice here? */
976 /* unlink ndpr_entry from nd_prefix list */
977 LIST_REMOVE(pr, ndpr_entry);
979 /* free list of routers that adversed the prefix */
980 for (pfr = pr->ndpr_advrtrs.lh_first; pfr; pfr = next) {
981 next = pfr->pfr_next;
989 pfxlist_onlink_check();
997 prelist_update(struct nd_prefixctl *new, struct nd_defrouter *dr,
998 struct mbuf *m, int mcast)
1000 INIT_VNET_INET6(curvnet);
1001 struct in6_ifaddr *ia6 = NULL, *ia6_match = NULL;
1003 struct ifnet *ifp = new->ndpr_ifp;
1004 struct nd_prefix *pr;
1009 struct in6_addrlifetime lt6_tmp;
1010 char ip6buf[INET6_ADDRSTRLEN];
1015 * Authenticity for NA consists authentication for
1016 * both IP header and IP datagrams, doesn't it ?
1018 #if defined(M_AUTHIPHDR) && defined(M_AUTHIPDGM)
1019 auth = ((m->m_flags & M_AUTHIPHDR) &&
1020 (m->m_flags & M_AUTHIPDGM));
1024 if ((pr = nd6_prefix_lookup(new)) != NULL) {
1026 * nd6_prefix_lookup() ensures that pr and new have the same
1027 * prefix on a same interface.
1031 * Update prefix information. Note that the on-link (L) bit
1032 * and the autonomous (A) bit should NOT be changed from 1
1035 if (new->ndpr_raf_onlink == 1)
1036 pr->ndpr_raf_onlink = 1;
1037 if (new->ndpr_raf_auto == 1)
1038 pr->ndpr_raf_auto = 1;
1039 if (new->ndpr_raf_onlink) {
1040 pr->ndpr_vltime = new->ndpr_vltime;
1041 pr->ndpr_pltime = new->ndpr_pltime;
1042 (void)in6_init_prefix_ltimes(pr); /* XXX error case? */
1043 pr->ndpr_lastupdate = time_second;
1046 if (new->ndpr_raf_onlink &&
1047 (pr->ndpr_stateflags & NDPRF_ONLINK) == 0) {
1050 if ((e = nd6_prefix_onlink(pr)) != 0) {
1052 "prelist_update: failed to make "
1053 "the prefix %s/%d on-link on %s "
1056 &pr->ndpr_prefix.sin6_addr),
1057 pr->ndpr_plen, if_name(pr->ndpr_ifp), e));
1058 /* proceed anyway. XXX: is it correct? */
1062 if (dr && pfxrtr_lookup(pr, dr) == NULL)
1065 struct nd_prefix *newpr = NULL;
1069 if (new->ndpr_vltime == 0)
1071 if (new->ndpr_raf_onlink == 0 && new->ndpr_raf_auto == 0)
1074 error = nd6_prelist_add(new, dr, &newpr);
1075 if (error != 0 || newpr == NULL) {
1076 nd6log((LOG_NOTICE, "prelist_update: "
1077 "nd6_prelist_add failed for %s/%d on %s "
1078 "errno=%d, returnpr=%p\n",
1079 ip6_sprintf(ip6buf, &new->ndpr_prefix.sin6_addr),
1080 new->ndpr_plen, if_name(new->ndpr_ifp),
1082 goto end; /* we should just give up in this case. */
1086 * XXX: from the ND point of view, we can ignore a prefix
1087 * with the on-link bit being zero. However, we need a
1088 * prefix structure for references from autoconfigured
1089 * addresses. Thus, we explicitly make sure that the prefix
1090 * itself expires now.
1092 if (newpr->ndpr_raf_onlink == 0) {
1093 newpr->ndpr_vltime = 0;
1094 newpr->ndpr_pltime = 0;
1095 in6_init_prefix_ltimes(newpr);
1102 * Address autoconfiguration based on Section 5.5.3 of RFC 2462.
1103 * Note that pr must be non NULL at this point.
1106 /* 5.5.3 (a). Ignore the prefix without the A bit set. */
1107 if (!new->ndpr_raf_auto)
1111 * 5.5.3 (b). the link-local prefix should have been ignored in
1115 /* 5.5.3 (c). Consistency check on lifetimes: pltime <= vltime. */
1116 if (new->ndpr_pltime > new->ndpr_vltime) {
1117 error = EINVAL; /* XXX: won't be used */
1122 * 5.5.3 (d). If the prefix advertised is not equal to the prefix of
1123 * an address configured by stateless autoconfiguration already in the
1124 * list of addresses associated with the interface, and the Valid
1125 * Lifetime is not 0, form an address. We first check if we have
1126 * a matching prefix.
1127 * Note: we apply a clarification in rfc2462bis-02 here. We only
1128 * consider autoconfigured addresses while RFC2462 simply said
1132 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1133 struct in6_ifaddr *ifa6;
1134 u_int32_t remaininglifetime;
1136 if (ifa->ifa_addr->sa_family != AF_INET6)
1139 ifa6 = (struct in6_ifaddr *)ifa;
1142 * We only consider autoconfigured addresses as per rfc2462bis.
1144 if (!(ifa6->ia6_flags & IN6_IFF_AUTOCONF))
1148 * Spec is not clear here, but I believe we should concentrate
1149 * on unicast (i.e. not anycast) addresses.
1150 * XXX: other ia6_flags? detached or duplicated?
1152 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0)
1156 * Ignore the address if it is not associated with a prefix
1157 * or is associated with a prefix that is different from this
1158 * one. (pr is never NULL here)
1160 if (ifa6->ia6_ndpr != pr)
1163 if (ia6_match == NULL) /* remember the first one */
1167 * An already autoconfigured address matched. Now that we
1168 * are sure there is at least one matched address, we can
1169 * proceed to 5.5.3. (e): update the lifetimes according to the
1170 * "two hours" rule and the privacy extension.
1171 * We apply some clarifications in rfc2462bis:
1172 * - use remaininglifetime instead of storedlifetime as a
1174 * - remove the dead code in the "two-hour" rule
1176 #define TWOHOUR (120*60)
1177 lt6_tmp = ifa6->ia6_lifetime;
1179 if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME)
1180 remaininglifetime = ND6_INFINITE_LIFETIME;
1181 else if (time_second - ifa6->ia6_updatetime >
1182 lt6_tmp.ia6t_vltime) {
1184 * The case of "invalid" address. We should usually
1185 * not see this case.
1187 remaininglifetime = 0;
1189 remaininglifetime = lt6_tmp.ia6t_vltime -
1190 (time_second - ifa6->ia6_updatetime);
1192 /* when not updating, keep the current stored lifetime. */
1193 lt6_tmp.ia6t_vltime = remaininglifetime;
1195 if (TWOHOUR < new->ndpr_vltime ||
1196 remaininglifetime < new->ndpr_vltime) {
1197 lt6_tmp.ia6t_vltime = new->ndpr_vltime;
1198 } else if (remaininglifetime <= TWOHOUR) {
1200 lt6_tmp.ia6t_vltime = new->ndpr_vltime;
1204 * new->ndpr_vltime <= TWOHOUR &&
1205 * TWOHOUR < remaininglifetime
1207 lt6_tmp.ia6t_vltime = TWOHOUR;
1210 /* The 2 hour rule is not imposed for preferred lifetime. */
1211 lt6_tmp.ia6t_pltime = new->ndpr_pltime;
1213 in6_init_address_ltimes(pr, <6_tmp);
1216 * We need to treat lifetimes for temporary addresses
1217 * differently, according to
1218 * draft-ietf-ipv6-privacy-addrs-v2-01.txt 3.3 (1);
1219 * we only update the lifetimes when they are in the maximum
1222 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0) {
1223 u_int32_t maxvltime, maxpltime;
1225 if (V_ip6_temp_valid_lifetime >
1226 (u_int32_t)((time_second - ifa6->ia6_createtime) +
1227 V_ip6_desync_factor)) {
1228 maxvltime = V_ip6_temp_valid_lifetime -
1229 (time_second - ifa6->ia6_createtime) -
1230 V_ip6_desync_factor;
1233 if (V_ip6_temp_preferred_lifetime >
1234 (u_int32_t)((time_second - ifa6->ia6_createtime) +
1235 V_ip6_desync_factor)) {
1236 maxpltime = V_ip6_temp_preferred_lifetime -
1237 (time_second - ifa6->ia6_createtime) -
1238 V_ip6_desync_factor;
1242 if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME ||
1243 lt6_tmp.ia6t_vltime > maxvltime) {
1244 lt6_tmp.ia6t_vltime = maxvltime;
1246 if (lt6_tmp.ia6t_pltime == ND6_INFINITE_LIFETIME ||
1247 lt6_tmp.ia6t_pltime > maxpltime) {
1248 lt6_tmp.ia6t_pltime = maxpltime;
1251 ifa6->ia6_lifetime = lt6_tmp;
1252 ifa6->ia6_updatetime = time_second;
1254 IF_ADDR_UNLOCK(ifp);
1255 if (ia6_match == NULL && new->ndpr_vltime) {
1259 * 5.5.3 (d) (continued)
1260 * No address matched and the valid lifetime is non-zero.
1261 * Create a new address.
1265 * Prefix Length check:
1266 * If the sum of the prefix length and interface identifier
1267 * length does not equal 128 bits, the Prefix Information
1268 * option MUST be ignored. The length of the interface
1269 * identifier is defined in a separate link-type specific
1272 ifidlen = in6_if2idlen(ifp);
1274 /* this should not happen, so we always log it. */
1275 log(LOG_ERR, "prelist_update: IFID undefined (%s)\n",
1279 if (ifidlen + pr->ndpr_plen != 128) {
1281 "prelist_update: invalid prefixlen "
1282 "%d for %s, ignored\n",
1283 pr->ndpr_plen, if_name(ifp)));
1287 if ((ia6 = in6_ifadd(new, mcast)) != NULL) {
1289 * note that we should use pr (not new) for reference.
1296 * When a new public address is created as described
1297 * in RFC2462, also create a new temporary address.
1300 * When an interface connects to a new link, a new
1301 * randomized interface identifier should be generated
1302 * immediately together with a new set of temporary
1303 * addresses. Thus, we specifiy 1 as the 2nd arg of
1306 if (V_ip6_use_tempaddr) {
1308 if ((e = in6_tmpifadd(ia6, 1, 1)) != 0) {
1309 nd6log((LOG_NOTICE, "prelist_update: "
1310 "failed to create a temporary "
1311 "address, errno=%d\n",
1315 ifa_free(&ia6->ia_ifa);
1318 * A newly added address might affect the status
1319 * of other addresses, so we check and update it.
1320 * XXX: what if address duplication happens?
1322 pfxlist_onlink_check();
1324 /* just set an error. do not bark here. */
1325 error = EADDRNOTAVAIL; /* XXX: might be unused. */
1335 * A supplement function used in the on-link detection below;
1336 * detect if a given prefix has a (probably) reachable advertising router.
1337 * XXX: lengthy function name...
1339 static struct nd_pfxrouter *
1340 find_pfxlist_reachable_router(struct nd_prefix *pr)
1342 struct nd_pfxrouter *pfxrtr;
1346 for (pfxrtr = LIST_FIRST(&pr->ndpr_advrtrs); pfxrtr != NULL;
1347 pfxrtr = LIST_NEXT(pfxrtr, pfr_entry)) {
1348 IF_AFDATA_LOCK(pfxrtr->router->ifp);
1349 ln = nd6_lookup(&pfxrtr->router->rtaddr, 0, pfxrtr->router->ifp);
1350 IF_AFDATA_UNLOCK(pfxrtr->router->ifp);
1353 canreach = ND6_IS_LLINFO_PROBREACH(ln);
1362 * Check if each prefix in the prefix list has at least one available router
1363 * that advertised the prefix (a router is "available" if its neighbor cache
1364 * entry is reachable or probably reachable).
1365 * If the check fails, the prefix may be off-link, because, for example,
1366 * we have moved from the network but the lifetime of the prefix has not
1367 * expired yet. So we should not use the prefix if there is another prefix
1368 * that has an available router.
1369 * But, if there is no prefix that has an available router, we still regards
1370 * all the prefixes as on-link. This is because we can't tell if all the
1371 * routers are simply dead or if we really moved from the network and there
1372 * is no router around us.
1375 pfxlist_onlink_check()
1377 INIT_VNET_INET6(curvnet);
1378 struct nd_prefix *pr;
1379 struct in6_ifaddr *ifa;
1380 struct nd_defrouter *dr;
1381 struct nd_pfxrouter *pfxrtr = NULL;
1384 * Check if there is a prefix that has a reachable advertising
1387 for (pr = V_nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
1388 if (pr->ndpr_raf_onlink && find_pfxlist_reachable_router(pr))
1393 * If we have no such prefix, check whether we still have a router
1394 * that does not advertise any prefixes.
1397 for (dr = TAILQ_FIRST(&V_nd_defrouter); dr;
1398 dr = TAILQ_NEXT(dr, dr_entry)) {
1399 struct nd_prefix *pr0;
1401 for (pr0 = V_nd_prefix.lh_first; pr0;
1402 pr0 = pr0->ndpr_next) {
1403 if ((pfxrtr = pfxrtr_lookup(pr0, dr)) != NULL)
1410 if (pr != NULL || (TAILQ_FIRST(&V_nd_defrouter) && pfxrtr == NULL)) {
1412 * There is at least one prefix that has a reachable router,
1413 * or at least a router which probably does not advertise
1414 * any prefixes. The latter would be the case when we move
1415 * to a new link where we have a router that does not provide
1416 * prefixes and we configure an address by hand.
1417 * Detach prefixes which have no reachable advertising
1418 * router, and attach other prefixes.
1420 for (pr = V_nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
1421 /* XXX: a link-local prefix should never be detached */
1422 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
1426 * we aren't interested in prefixes without the L bit
1429 if (pr->ndpr_raf_onlink == 0)
1432 if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 &&
1433 find_pfxlist_reachable_router(pr) == NULL)
1434 pr->ndpr_stateflags |= NDPRF_DETACHED;
1435 if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 &&
1436 find_pfxlist_reachable_router(pr) != 0)
1437 pr->ndpr_stateflags &= ~NDPRF_DETACHED;
1440 /* there is no prefix that has a reachable router */
1441 for (pr = V_nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
1442 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
1445 if (pr->ndpr_raf_onlink == 0)
1448 if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0)
1449 pr->ndpr_stateflags &= ~NDPRF_DETACHED;
1454 * Remove each interface route associated with a (just) detached
1455 * prefix, and reinstall the interface route for a (just) attached
1456 * prefix. Note that all attempt of reinstallation does not
1457 * necessarily success, when a same prefix is shared among multiple
1458 * interfaces. Such cases will be handled in nd6_prefix_onlink,
1459 * so we don't have to care about them.
1461 for (pr = V_nd_prefix.lh_first; pr; pr = pr->ndpr_next) {
1463 char ip6buf[INET6_ADDRSTRLEN];
1465 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
1468 if (pr->ndpr_raf_onlink == 0)
1471 if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 &&
1472 (pr->ndpr_stateflags & NDPRF_ONLINK) != 0) {
1473 if ((e = nd6_prefix_offlink(pr)) != 0) {
1475 "pfxlist_onlink_check: failed to "
1476 "make %s/%d offlink, errno=%d\n",
1478 &pr->ndpr_prefix.sin6_addr),
1482 if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 &&
1483 (pr->ndpr_stateflags & NDPRF_ONLINK) == 0 &&
1484 pr->ndpr_raf_onlink) {
1485 if ((e = nd6_prefix_onlink(pr)) != 0) {
1487 "pfxlist_onlink_check: failed to "
1488 "make %s/%d onlink, errno=%d\n",
1490 &pr->ndpr_prefix.sin6_addr),
1497 * Changes on the prefix status might affect address status as well.
1498 * Make sure that all addresses derived from an attached prefix are
1499 * attached, and that all addresses derived from a detached prefix are
1500 * detached. Note, however, that a manually configured address should
1501 * always be attached.
1502 * The precise detection logic is same as the one for prefixes.
1504 TAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) {
1505 if (!(ifa->ia6_flags & IN6_IFF_AUTOCONF))
1508 if (ifa->ia6_ndpr == NULL) {
1510 * This can happen when we first configure the address
1511 * (i.e. the address exists, but the prefix does not).
1512 * XXX: complicated relationships...
1517 if (find_pfxlist_reachable_router(ifa->ia6_ndpr))
1521 TAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) {
1522 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
1525 if (ifa->ia6_ndpr == NULL) /* XXX: see above. */
1528 if (find_pfxlist_reachable_router(ifa->ia6_ndpr)) {
1529 if (ifa->ia6_flags & IN6_IFF_DETACHED) {
1530 ifa->ia6_flags &= ~IN6_IFF_DETACHED;
1531 ifa->ia6_flags |= IN6_IFF_TENTATIVE;
1532 nd6_dad_start((struct ifaddr *)ifa, 0);
1535 ifa->ia6_flags |= IN6_IFF_DETACHED;
1540 TAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) {
1541 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0)
1544 if (ifa->ia6_flags & IN6_IFF_DETACHED) {
1545 ifa->ia6_flags &= ~IN6_IFF_DETACHED;
1546 ifa->ia6_flags |= IN6_IFF_TENTATIVE;
1547 /* Do we need a delay in this case? */
1548 nd6_dad_start((struct ifaddr *)ifa, 0);
1555 nd6_prefix_onlink(struct nd_prefix *pr)
1557 INIT_VNET_INET6(curvnet);
1559 struct ifnet *ifp = pr->ndpr_ifp;
1560 struct sockaddr_in6 mask6;
1561 struct nd_prefix *opr;
1564 struct radix_node_head *rnh;
1565 struct rtentry *rt = NULL;
1566 char ip6buf[INET6_ADDRSTRLEN];
1567 struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK};
1570 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0) {
1572 "nd6_prefix_onlink: %s/%d is already on-link\n",
1573 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
1579 * Add the interface route associated with the prefix. Before
1580 * installing the route, check if there's the same prefix on another
1581 * interface, and the prefix has already installed the interface route.
1582 * Although such a configuration is expected to be rare, we explicitly
1585 for (opr = V_nd_prefix.lh_first; opr; opr = opr->ndpr_next) {
1589 if ((opr->ndpr_stateflags & NDPRF_ONLINK) == 0)
1592 if (opr->ndpr_plen == pr->ndpr_plen &&
1593 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
1594 &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen))
1599 * We prefer link-local addresses as the associated interface address.
1601 /* search for a link-local addr */
1602 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp,
1603 IN6_IFF_NOTREADY | IN6_IFF_ANYCAST);
1605 /* XXX: freebsd does not have ifa_ifwithaf */
1607 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1608 if (ifa->ifa_addr->sa_family == AF_INET6)
1613 IF_ADDR_UNLOCK(ifp);
1614 /* should we care about ia6_flags? */
1618 * This can still happen, when, for example, we receive an RA
1619 * containing a prefix with the L bit set and the A bit clear,
1620 * after removing all IPv6 addresses on the receiving
1621 * interface. This should, of course, be rare though.
1624 "nd6_prefix_onlink: failed to find any ifaddr"
1625 " to add route for a prefix(%s/%d) on %s\n",
1626 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
1627 pr->ndpr_plen, if_name(ifp)));
1632 * in6_ifinit() sets nd6_rtrequest to ifa_rtrequest for all ifaddrs.
1633 * ifa->ifa_rtrequest = nd6_rtrequest;
1635 bzero(&mask6, sizeof(mask6));
1636 mask6.sin6_len = sizeof(mask6);
1637 mask6.sin6_addr = pr->ndpr_mask;
1638 rtflags = ifa->ifa_flags | RTF_UP;
1639 error = rtrequest(RTM_ADD, (struct sockaddr *)&pr->ndpr_prefix,
1640 ifa->ifa_addr, (struct sockaddr *)&mask6, rtflags, &rt);
1642 if (rt != NULL) /* this should be non NULL, though */ {
1643 rnh = rt_tables_get_rnh(rt->rt_fibnum, AF_INET6);
1644 /* XXX what if rhn == NULL? */
1645 RADIX_NODE_HEAD_LOCK(rnh);
1647 if (!rt_setgate(rt, rt_key(rt), (struct sockaddr *)&null_sdl)) {
1648 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_type =
1649 rt->rt_ifp->if_type;
1650 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_index =
1651 rt->rt_ifp->if_index;
1653 RADIX_NODE_HEAD_UNLOCK(rnh);
1654 nd6_rtmsg(RTM_ADD, rt);
1657 pr->ndpr_stateflags |= NDPRF_ONLINK;
1659 char ip6bufg[INET6_ADDRSTRLEN], ip6bufm[INET6_ADDRSTRLEN];
1660 nd6log((LOG_ERR, "nd6_prefix_onlink: failed to add route for a"
1661 " prefix (%s/%d) on %s, gw=%s, mask=%s, flags=%lx "
1663 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
1664 pr->ndpr_plen, if_name(ifp),
1665 ip6_sprintf(ip6bufg, &((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr),
1666 ip6_sprintf(ip6bufm, &mask6.sin6_addr), rtflags, error));
1681 nd6_prefix_offlink(struct nd_prefix *pr)
1683 INIT_VNET_INET6(curvnet);
1685 struct ifnet *ifp = pr->ndpr_ifp;
1686 struct nd_prefix *opr;
1687 struct sockaddr_in6 sa6, mask6;
1688 struct rtentry *rt = NULL;
1689 char ip6buf[INET6_ADDRSTRLEN];
1692 if ((pr->ndpr_stateflags & NDPRF_ONLINK) == 0) {
1694 "nd6_prefix_offlink: %s/%d is already off-link\n",
1695 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr),
1700 bzero(&sa6, sizeof(sa6));
1701 sa6.sin6_family = AF_INET6;
1702 sa6.sin6_len = sizeof(sa6);
1703 bcopy(&pr->ndpr_prefix.sin6_addr, &sa6.sin6_addr,
1704 sizeof(struct in6_addr));
1705 bzero(&mask6, sizeof(mask6));
1706 mask6.sin6_family = AF_INET6;
1707 mask6.sin6_len = sizeof(sa6);
1708 bcopy(&pr->ndpr_mask, &mask6.sin6_addr, sizeof(struct in6_addr));
1709 error = rtrequest(RTM_DELETE, (struct sockaddr *)&sa6, NULL,
1710 (struct sockaddr *)&mask6, 0, &rt);
1712 pr->ndpr_stateflags &= ~NDPRF_ONLINK;
1714 /* report the route deletion to the routing socket. */
1716 nd6_rtmsg(RTM_DELETE, rt);
1719 * There might be the same prefix on another interface,
1720 * the prefix which could not be on-link just because we have
1721 * the interface route (see comments in nd6_prefix_onlink).
1722 * If there's one, try to make the prefix on-link on the
1725 for (opr = V_nd_prefix.lh_first; opr; opr = opr->ndpr_next) {
1729 if ((opr->ndpr_stateflags & NDPRF_ONLINK) != 0)
1733 * KAME specific: detached prefixes should not be
1736 if ((opr->ndpr_stateflags & NDPRF_DETACHED) != 0)
1739 if (opr->ndpr_plen == pr->ndpr_plen &&
1740 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr,
1741 &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen)) {
1744 if ((e = nd6_prefix_onlink(opr)) != 0) {
1746 "nd6_prefix_offlink: failed to "
1747 "recover a prefix %s/%d from %s "
1748 "to %s (errno = %d)\n",
1750 &opr->ndpr_prefix.sin6_addr),
1751 opr->ndpr_plen, if_name(ifp),
1752 if_name(opr->ndpr_ifp), e));
1757 /* XXX: can we still set the NDPRF_ONLINK flag? */
1759 "nd6_prefix_offlink: failed to delete route: "
1760 "%s/%d on %s (errno = %d)\n",
1761 ip6_sprintf(ip6buf, &sa6.sin6_addr), pr->ndpr_plen,
1762 if_name(ifp), error));
1772 static struct in6_ifaddr *
1773 in6_ifadd(struct nd_prefixctl *pr, int mcast)
1775 INIT_VNET_INET6(curvnet);
1776 struct ifnet *ifp = pr->ndpr_ifp;
1778 struct in6_aliasreq ifra;
1779 struct in6_ifaddr *ia, *ib;
1781 struct in6_addr mask;
1782 int prefixlen = pr->ndpr_plen;
1784 char ip6buf[INET6_ADDRSTRLEN];
1786 in6_prefixlen2mask(&mask, prefixlen);
1789 * find a link-local address (will be interface ID).
1790 * Is it really mandatory? Theoretically, a global or a site-local
1791 * address can be configured without a link-local address, if we
1792 * have a unique interface identifier...
1794 * it is not mandatory to have a link-local address, we can generate
1795 * interface identifier on the fly. we do this because:
1796 * (1) it should be the easiest way to find interface identifier.
1797 * (2) RFC2462 5.4 suggesting the use of the same interface identifier
1798 * for multiple addresses on a single interface, and possible shortcut
1799 * of DAD. we omitted DAD for this reason in the past.
1800 * (3) a user can prevent autoconfiguration of global address
1801 * by removing link-local address by hand (this is partly because we
1802 * don't have other way to control the use of IPv6 on an interface.
1803 * this has been our design choice - cf. NRL's "ifconfig auto").
1804 * (4) it is easier to manage when an interface has addresses
1805 * with the same interface identifier, than to have multiple addresses
1806 * with different interface identifiers.
1808 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0); /* 0 is OK? */
1810 ib = (struct in6_ifaddr *)ifa;
1814 /* prefixlen + ifidlen must be equal to 128 */
1815 plen0 = in6_mask2len(&ib->ia_prefixmask.sin6_addr, NULL);
1816 if (prefixlen != plen0) {
1818 nd6log((LOG_INFO, "in6_ifadd: wrong prefixlen for %s "
1819 "(prefix=%d ifid=%d)\n",
1820 if_name(ifp), prefixlen, 128 - plen0));
1826 bzero(&ifra, sizeof(ifra));
1828 * in6_update_ifa() does not use ifra_name, but we accurately set it
1831 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
1832 ifra.ifra_addr.sin6_family = AF_INET6;
1833 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
1835 ifra.ifra_addr.sin6_addr = pr->ndpr_prefix.sin6_addr;
1836 ifra.ifra_addr.sin6_addr.s6_addr32[0] &= mask.s6_addr32[0];
1837 ifra.ifra_addr.sin6_addr.s6_addr32[1] &= mask.s6_addr32[1];
1838 ifra.ifra_addr.sin6_addr.s6_addr32[2] &= mask.s6_addr32[2];
1839 ifra.ifra_addr.sin6_addr.s6_addr32[3] &= mask.s6_addr32[3];
1842 ifra.ifra_addr.sin6_addr.s6_addr32[0] |=
1843 (ib->ia_addr.sin6_addr.s6_addr32[0] & ~mask.s6_addr32[0]);
1844 ifra.ifra_addr.sin6_addr.s6_addr32[1] |=
1845 (ib->ia_addr.sin6_addr.s6_addr32[1] & ~mask.s6_addr32[1]);
1846 ifra.ifra_addr.sin6_addr.s6_addr32[2] |=
1847 (ib->ia_addr.sin6_addr.s6_addr32[2] & ~mask.s6_addr32[2]);
1848 ifra.ifra_addr.sin6_addr.s6_addr32[3] |=
1849 (ib->ia_addr.sin6_addr.s6_addr32[3] & ~mask.s6_addr32[3]);
1852 /* new prefix mask. */
1853 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
1854 ifra.ifra_prefixmask.sin6_family = AF_INET6;
1855 bcopy(&mask, &ifra.ifra_prefixmask.sin6_addr,
1856 sizeof(ifra.ifra_prefixmask.sin6_addr));
1859 ifra.ifra_lifetime.ia6t_vltime = pr->ndpr_vltime;
1860 ifra.ifra_lifetime.ia6t_pltime = pr->ndpr_pltime;
1862 /* XXX: scope zone ID? */
1864 ifra.ifra_flags |= IN6_IFF_AUTOCONF; /* obey autoconf */
1867 * Make sure that we do not have this address already. This should
1868 * usually not happen, but we can still see this case, e.g., if we
1869 * have manually configured the exact address to be configured.
1871 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp,
1872 &ifra.ifra_addr.sin6_addr);
1875 /* this should be rare enough to make an explicit log */
1876 log(LOG_INFO, "in6_ifadd: %s is already configured\n",
1877 ip6_sprintf(ip6buf, &ifra.ifra_addr.sin6_addr));
1882 * Allocate ifaddr structure, link into chain, etc.
1883 * If we are going to create a new address upon receiving a multicasted
1884 * RA, we need to impose a random delay before starting DAD.
1885 * [draft-ietf-ipv6-rfc2462bis-02.txt, Section 5.4.2]
1889 updateflags |= IN6_IFAUPDATE_DADDELAY;
1890 if ((error = in6_update_ifa(ifp, &ifra, NULL, updateflags)) != 0) {
1892 "in6_ifadd: failed to make ifaddr %s on %s (errno=%d)\n",
1893 ip6_sprintf(ip6buf, &ifra.ifra_addr.sin6_addr),
1894 if_name(ifp), error));
1895 return (NULL); /* ifaddr must not have been allocated. */
1898 ia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
1900 * XXXRW: Assumption of non-NULLness here might not be true with
1901 * fine-grained locking -- should we validate it? Or just return
1902 * earlier ifa rather than looking it up again?
1904 return (ia); /* this is always non-NULL and referenced. */
1908 * ia0 - corresponding public address
1911 in6_tmpifadd(const struct in6_ifaddr *ia0, int forcegen, int delay)
1913 INIT_VNET_INET6(curvnet);
1914 struct ifnet *ifp = ia0->ia_ifa.ifa_ifp;
1915 struct in6_ifaddr *newia, *ia;
1916 struct in6_aliasreq ifra;
1918 int trylimit = 3; /* XXX: adhoc value */
1920 u_int32_t randid[2];
1921 time_t vltime0, pltime0;
1923 bzero(&ifra, sizeof(ifra));
1924 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));
1925 ifra.ifra_addr = ia0->ia_addr;
1926 /* copy prefix mask */
1927 ifra.ifra_prefixmask = ia0->ia_prefixmask;
1928 /* clear the old IFID */
1929 for (i = 0; i < 4; i++) {
1930 ifra.ifra_addr.sin6_addr.s6_addr32[i] &=
1931 ifra.ifra_prefixmask.sin6_addr.s6_addr32[i];
1935 if (in6_get_tmpifid(ifp, (u_int8_t *)randid,
1936 (const u_int8_t *)&ia0->ia_addr.sin6_addr.s6_addr[8], forcegen)) {
1937 nd6log((LOG_NOTICE, "in6_tmpifadd: failed to find a good "
1941 ifra.ifra_addr.sin6_addr.s6_addr32[2] |=
1942 (randid[0] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[2]));
1943 ifra.ifra_addr.sin6_addr.s6_addr32[3] |=
1944 (randid[1] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[3]));
1947 * in6_get_tmpifid() quite likely provided a unique interface ID.
1948 * However, we may still have a chance to see collision, because
1949 * there may be a time lag between generation of the ID and generation
1950 * of the address. So, we'll do one more sanity check.
1952 TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) {
1953 if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr,
1954 &ifra.ifra_addr.sin6_addr)) {
1955 if (trylimit-- == 0) {
1957 * Give up. Something strange should have
1960 nd6log((LOG_NOTICE, "in6_tmpifadd: failed to "
1961 "find a unique random IFID\n"));
1970 * The Valid Lifetime is the lower of the Valid Lifetime of the
1971 * public address or TEMP_VALID_LIFETIME.
1972 * The Preferred Lifetime is the lower of the Preferred Lifetime
1973 * of the public address or TEMP_PREFERRED_LIFETIME -
1976 if (ia0->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
1977 vltime0 = IFA6_IS_INVALID(ia0) ? 0 :
1978 (ia0->ia6_lifetime.ia6t_vltime -
1979 (time_second - ia0->ia6_updatetime));
1980 if (vltime0 > V_ip6_temp_valid_lifetime)
1981 vltime0 = V_ip6_temp_valid_lifetime;
1983 vltime0 = V_ip6_temp_valid_lifetime;
1984 if (ia0->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
1985 pltime0 = IFA6_IS_DEPRECATED(ia0) ? 0 :
1986 (ia0->ia6_lifetime.ia6t_pltime -
1987 (time_second - ia0->ia6_updatetime));
1988 if (pltime0 > V_ip6_temp_preferred_lifetime - V_ip6_desync_factor){
1989 pltime0 = V_ip6_temp_preferred_lifetime -
1990 V_ip6_desync_factor;
1993 pltime0 = V_ip6_temp_preferred_lifetime - V_ip6_desync_factor;
1994 ifra.ifra_lifetime.ia6t_vltime = vltime0;
1995 ifra.ifra_lifetime.ia6t_pltime = pltime0;
1998 * A temporary address is created only if this calculated Preferred
1999 * Lifetime is greater than REGEN_ADVANCE time units.
2001 if (ifra.ifra_lifetime.ia6t_pltime <= V_ip6_temp_regen_advance)
2004 /* XXX: scope zone ID? */
2006 ifra.ifra_flags |= (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY);
2008 /* allocate ifaddr structure, link into chain, etc. */
2011 updateflags |= IN6_IFAUPDATE_DADDELAY;
2012 if ((error = in6_update_ifa(ifp, &ifra, NULL, updateflags)) != 0)
2015 newia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr);
2016 if (newia == NULL) { /* XXX: can it happen? */
2018 "in6_tmpifadd: ifa update succeeded, but we got "
2020 return (EINVAL); /* XXX */
2022 newia->ia6_ndpr = ia0->ia6_ndpr;
2023 newia->ia6_ndpr->ndpr_refcnt++;
2024 ifa_free(&newia->ia_ifa);
2027 * A newly added address might affect the status of other addresses.
2028 * XXX: when the temporary address is generated with a new public
2029 * address, the onlink check is redundant. However, it would be safe
2030 * to do the check explicitly everywhere a new address is generated,
2031 * and, in fact, we surely need the check when we create a new
2032 * temporary address due to deprecation of an old temporary address.
2034 pfxlist_onlink_check();
2040 in6_init_prefix_ltimes(struct nd_prefix *ndpr)
2042 if (ndpr->ndpr_pltime == ND6_INFINITE_LIFETIME)
2043 ndpr->ndpr_preferred = 0;
2045 ndpr->ndpr_preferred = time_second + ndpr->ndpr_pltime;
2046 if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME)
2047 ndpr->ndpr_expire = 0;
2049 ndpr->ndpr_expire = time_second + ndpr->ndpr_vltime;
2055 in6_init_address_ltimes(struct nd_prefix *new, struct in6_addrlifetime *lt6)
2057 /* init ia6t_expire */
2058 if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME)
2059 lt6->ia6t_expire = 0;
2061 lt6->ia6t_expire = time_second;
2062 lt6->ia6t_expire += lt6->ia6t_vltime;
2065 /* init ia6t_preferred */
2066 if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME)
2067 lt6->ia6t_preferred = 0;
2069 lt6->ia6t_preferred = time_second;
2070 lt6->ia6t_preferred += lt6->ia6t_pltime;
2075 * Delete all the routing table entries that use the specified gateway.
2076 * XXX: this function causes search through all entries of routing table, so
2077 * it shouldn't be called when acting as a router.
2080 rt6_flush(struct in6_addr *gateway, struct ifnet *ifp)
2082 struct radix_node_head *rnh;
2085 /* We'll care only link-local addresses */
2086 if (!IN6_IS_ADDR_LINKLOCAL(gateway)) {
2091 rnh = rt_tables_get_rnh(0, AF_INET6);
2095 RADIX_NODE_HEAD_LOCK(rnh);
2096 rnh->rnh_walktree(rnh, rt6_deleteroute, (void *)gateway);
2097 RADIX_NODE_HEAD_UNLOCK(rnh);
2102 rt6_deleteroute(struct radix_node *rn, void *arg)
2104 #define SIN6(s) ((struct sockaddr_in6 *)s)
2105 struct rtentry *rt = (struct rtentry *)rn;
2106 struct in6_addr *gate = (struct in6_addr *)arg;
2108 if (rt->rt_gateway == NULL || rt->rt_gateway->sa_family != AF_INET6)
2111 if (!IN6_ARE_ADDR_EQUAL(gate, &SIN6(rt->rt_gateway)->sin6_addr)) {
2116 * Do not delete a static route.
2117 * XXX: this seems to be a bit ad-hoc. Should we consider the
2118 * 'cloned' bit instead?
2120 if ((rt->rt_flags & RTF_STATIC) != 0)
2124 * We delete only host route. This means, in particular, we don't
2125 * delete default route.
2127 if ((rt->rt_flags & RTF_HOST) == 0)
2130 return (rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway,
2131 rt_mask(rt), rt->rt_flags, 0));
2136 nd6_setdefaultiface(int ifindex)
2138 INIT_VNET_NET(curvnet);
2139 INIT_VNET_INET6(curvnet);
2142 if (ifindex < 0 || V_if_index < ifindex)
2144 if (ifindex != 0 && !ifnet_byindex(ifindex))
2147 if (V_nd6_defifindex != ifindex) {
2148 V_nd6_defifindex = ifindex;
2149 if (V_nd6_defifindex > 0)
2150 V_nd6_defifp = ifnet_byindex(V_nd6_defifindex);
2152 V_nd6_defifp = NULL;
2155 * Our current implementation assumes one-to-one maping between
2156 * interfaces and links, so it would be natural to use the
2157 * default interface as the default link.
2159 scope6_setdefault(V_nd6_defifp);