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.c,v 1.144 2001/05/24 07:44:00 itojun 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/callout.h>
41 #include <sys/malloc.h>
43 #include <sys/socket.h>
44 #include <sys/sockio.h>
46 #include <sys/kernel.h>
47 #include <sys/protosw.h>
48 #include <sys/errno.h>
49 #include <sys/syslog.h>
51 #include <sys/rwlock.h>
52 #include <sys/queue.h>
53 #include <sys/sysctl.h>
56 #include <net/if_arc.h>
57 #include <net/if_dl.h>
58 #include <net/if_types.h>
59 #include <net/iso88025.h>
61 #include <net/route.h>
64 #include <netinet/in.h>
65 #include <net/if_llatbl.h>
66 #define L3_ADDR_SIN6(le) ((struct sockaddr_in6 *) L3_ADDR(le))
67 #include <netinet/if_ether.h>
68 #include <netinet6/in6_var.h>
69 #include <netinet/ip6.h>
70 #include <netinet6/ip6_var.h>
71 #include <netinet6/scope6_var.h>
72 #include <netinet6/nd6.h>
73 #include <netinet6/in6_ifattach.h>
74 #include <netinet/icmp6.h>
75 #include <netinet6/send.h>
77 #include <sys/limits.h>
79 #include <security/mac/mac_framework.h>
81 #define ND6_SLOWTIMER_INTERVAL (60 * 60) /* 1 hour */
82 #define ND6_RECALC_REACHTM_INTERVAL (60 * 120) /* 2 hours */
84 #define SIN6(s) ((struct sockaddr_in6 *)s)
87 VNET_DEFINE(int, nd6_prune) = 1; /* walk list every 1 seconds */
88 VNET_DEFINE(int, nd6_delay) = 5; /* delay first probe time 5 second */
89 VNET_DEFINE(int, nd6_umaxtries) = 3; /* maximum unicast query */
90 VNET_DEFINE(int, nd6_mmaxtries) = 3; /* maximum multicast query */
91 VNET_DEFINE(int, nd6_useloopback) = 1; /* use loopback interface for
93 VNET_DEFINE(int, nd6_gctimer) = (60 * 60 * 24); /* 1 day: garbage
96 /* preventing too many loops in ND option parsing */
97 static VNET_DEFINE(int, nd6_maxndopt) = 10; /* max # of ND options allowed */
99 VNET_DEFINE(int, nd6_maxnudhint) = 0; /* max # of subsequent upper
101 static VNET_DEFINE(int, nd6_maxqueuelen) = 1; /* max pkts cached in unresolved
103 #define V_nd6_maxndopt VNET(nd6_maxndopt)
104 #define V_nd6_maxqueuelen VNET(nd6_maxqueuelen)
107 VNET_DEFINE(int, nd6_debug) = 1;
109 VNET_DEFINE(int, nd6_debug) = 0;
114 static int nd6_inuse, nd6_allocated;
117 VNET_DEFINE(struct nd_drhead, nd_defrouter);
118 VNET_DEFINE(struct nd_prhead, nd_prefix);
120 VNET_DEFINE(int, nd6_recalc_reachtm_interval) = ND6_RECALC_REACHTM_INTERVAL;
121 #define V_nd6_recalc_reachtm_interval VNET(nd6_recalc_reachtm_interval)
123 static struct sockaddr_in6 all1_sa;
125 int (*send_sendso_input_hook)(struct mbuf *, struct ifnet *, int, int);
127 static int nd6_is_new_addr_neighbor __P((struct sockaddr_in6 *,
129 static void nd6_setmtu0(struct ifnet *, struct nd_ifinfo *);
130 static void nd6_slowtimo(void *);
131 static int regen_tmpaddr(struct in6_ifaddr *);
132 static struct llentry *nd6_free(struct llentry *, int);
133 static void nd6_llinfo_timer(void *);
134 static void clear_llinfo_pqueue(struct llentry *);
136 static VNET_DEFINE(struct callout, nd6_slowtimo_ch);
137 #define V_nd6_slowtimo_ch VNET(nd6_slowtimo_ch)
139 VNET_DEFINE(struct callout, nd6_timer_ch);
146 LIST_INIT(&V_nd_prefix);
148 all1_sa.sin6_family = AF_INET6;
149 all1_sa.sin6_len = sizeof(struct sockaddr_in6);
150 for (i = 0; i < sizeof(all1_sa.sin6_addr); i++)
151 all1_sa.sin6_addr.s6_addr[i] = 0xff;
153 /* initialization of the default router list */
154 TAILQ_INIT(&V_nd_defrouter);
157 callout_init(&V_nd6_slowtimo_ch, 0);
158 callout_reset(&V_nd6_slowtimo_ch, ND6_SLOWTIMER_INTERVAL * hz,
159 nd6_slowtimo, curvnet);
167 callout_drain(&V_nd6_slowtimo_ch);
168 callout_drain(&V_nd6_timer_ch);
173 nd6_ifattach(struct ifnet *ifp)
175 struct nd_ifinfo *nd;
177 nd = (struct nd_ifinfo *)malloc(sizeof(*nd), M_IP6NDP, M_WAITOK);
178 bzero(nd, sizeof(*nd));
182 nd->chlim = IPV6_DEFHLIM;
183 nd->basereachable = REACHABLE_TIME;
184 nd->reachable = ND_COMPUTE_RTIME(nd->basereachable);
185 nd->retrans = RETRANS_TIMER;
187 nd->flags = ND6_IFF_PERFORMNUD;
189 /* A loopback interface always has ND6_IFF_AUTO_LINKLOCAL. */
190 if (V_ip6_auto_linklocal || (ifp->if_flags & IFF_LOOPBACK))
191 nd->flags |= ND6_IFF_AUTO_LINKLOCAL;
193 /* A loopback interface does not need to accept RTADV. */
194 if (V_ip6_accept_rtadv && !(ifp->if_flags & IFF_LOOPBACK))
195 nd->flags |= ND6_IFF_ACCEPT_RTADV;
196 if (V_ip6_no_radr && !(ifp->if_flags & IFF_LOOPBACK))
197 nd->flags |= ND6_IFF_NO_RADR;
199 /* XXX: we cannot call nd6_setmtu since ifp is not fully initialized */
200 nd6_setmtu0(ifp, nd);
206 nd6_ifdetach(struct nd_ifinfo *nd)
213 * Reset ND level link MTU. This function is called when the physical MTU
214 * changes, which means we might have to adjust the ND level MTU.
217 nd6_setmtu(struct ifnet *ifp)
220 nd6_setmtu0(ifp, ND_IFINFO(ifp));
223 /* XXX todo: do not maintain copy of ifp->if_mtu in ndi->maxmtu */
225 nd6_setmtu0(struct ifnet *ifp, struct nd_ifinfo *ndi)
229 omaxmtu = ndi->maxmtu;
231 switch (ifp->if_type) {
233 ndi->maxmtu = MIN(ARC_PHDS_MAXMTU, ifp->if_mtu); /* RFC2497 */
236 ndi->maxmtu = MIN(FDDIIPMTU, ifp->if_mtu); /* RFC2467 */
239 ndi->maxmtu = MIN(ISO88025_MAX_MTU, ifp->if_mtu);
242 ndi->maxmtu = ifp->if_mtu;
247 * Decreasing the interface MTU under IPV6 minimum MTU may cause
248 * undesirable situation. We thus notify the operator of the change
249 * explicitly. The check for omaxmtu is necessary to restrict the
250 * log to the case of changing the MTU, not initializing it.
252 if (omaxmtu >= IPV6_MMTU && ndi->maxmtu < IPV6_MMTU) {
253 log(LOG_NOTICE, "nd6_setmtu0: "
254 "new link MTU on %s (%lu) is too small for IPv6\n",
255 if_name(ifp), (unsigned long)ndi->maxmtu);
258 if (ndi->maxmtu > V_in6_maxmtu)
259 in6_setmaxmtu(); /* check all interfaces just in case */
264 nd6_option_init(void *opt, int icmp6len, union nd_opts *ndopts)
267 bzero(ndopts, sizeof(*ndopts));
268 ndopts->nd_opts_search = (struct nd_opt_hdr *)opt;
270 = (struct nd_opt_hdr *)(((u_char *)opt) + icmp6len);
273 ndopts->nd_opts_done = 1;
274 ndopts->nd_opts_search = NULL;
279 * Take one ND option.
282 nd6_option(union nd_opts *ndopts)
284 struct nd_opt_hdr *nd_opt;
288 panic("ndopts == NULL in nd6_option");
289 if (ndopts->nd_opts_last == NULL)
290 panic("uninitialized ndopts in nd6_option");
291 if (ndopts->nd_opts_search == NULL)
293 if (ndopts->nd_opts_done)
296 nd_opt = ndopts->nd_opts_search;
298 /* make sure nd_opt_len is inside the buffer */
299 if ((caddr_t)&nd_opt->nd_opt_len >= (caddr_t)ndopts->nd_opts_last) {
300 bzero(ndopts, sizeof(*ndopts));
304 olen = nd_opt->nd_opt_len << 3;
307 * Message validation requires that all included
308 * options have a length that is greater than zero.
310 bzero(ndopts, sizeof(*ndopts));
314 ndopts->nd_opts_search = (struct nd_opt_hdr *)((caddr_t)nd_opt + olen);
315 if (ndopts->nd_opts_search > ndopts->nd_opts_last) {
316 /* option overruns the end of buffer, invalid */
317 bzero(ndopts, sizeof(*ndopts));
319 } else if (ndopts->nd_opts_search == ndopts->nd_opts_last) {
320 /* reached the end of options chain */
321 ndopts->nd_opts_done = 1;
322 ndopts->nd_opts_search = NULL;
328 * Parse multiple ND options.
329 * This function is much easier to use, for ND routines that do not need
330 * multiple options of the same type.
333 nd6_options(union nd_opts *ndopts)
335 struct nd_opt_hdr *nd_opt;
339 panic("ndopts == NULL in nd6_options");
340 if (ndopts->nd_opts_last == NULL)
341 panic("uninitialized ndopts in nd6_options");
342 if (ndopts->nd_opts_search == NULL)
346 nd_opt = nd6_option(ndopts);
347 if (nd_opt == NULL && ndopts->nd_opts_last == NULL) {
349 * Message validation requires that all included
350 * options have a length that is greater than zero.
352 ICMP6STAT_INC(icp6s_nd_badopt);
353 bzero(ndopts, sizeof(*ndopts));
360 switch (nd_opt->nd_opt_type) {
361 case ND_OPT_SOURCE_LINKADDR:
362 case ND_OPT_TARGET_LINKADDR:
364 case ND_OPT_REDIRECTED_HEADER:
365 if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) {
367 "duplicated ND6 option found (type=%d)\n",
368 nd_opt->nd_opt_type));
371 ndopts->nd_opt_array[nd_opt->nd_opt_type]
375 case ND_OPT_PREFIX_INFORMATION:
376 if (ndopts->nd_opt_array[nd_opt->nd_opt_type] == 0) {
377 ndopts->nd_opt_array[nd_opt->nd_opt_type]
380 ndopts->nd_opts_pi_end =
381 (struct nd_opt_prefix_info *)nd_opt;
385 * Unknown options must be silently ignored,
386 * to accomodate future extension to the protocol.
389 "nd6_options: unsupported option %d - "
390 "option ignored\n", nd_opt->nd_opt_type));
395 if (i > V_nd6_maxndopt) {
396 ICMP6STAT_INC(icp6s_nd_toomanyopt);
397 nd6log((LOG_INFO, "too many loop in nd opt\n"));
401 if (ndopts->nd_opts_done)
409 * ND6 timer routine to handle ND6 entries
412 nd6_llinfo_settimer_locked(struct llentry *ln, long tick)
416 LLE_WLOCK_ASSERT(ln);
421 canceled = callout_stop(&ln->ln_timer_ch);
423 ln->la_expire = time_second + tick / hz;
425 if (tick > INT_MAX) {
426 ln->ln_ntick = tick - INT_MAX;
427 canceled = callout_reset(&ln->ln_timer_ch, INT_MAX,
428 nd6_llinfo_timer, ln);
431 canceled = callout_reset(&ln->ln_timer_ch, tick,
432 nd6_llinfo_timer, ln);
440 nd6_llinfo_settimer(struct llentry *ln, long tick)
444 nd6_llinfo_settimer_locked(ln, tick);
449 nd6_llinfo_timer(void *arg)
452 struct in6_addr *dst;
454 struct nd_ifinfo *ndi = NULL;
456 KASSERT(arg != NULL, ("%s: arg NULL", __func__));
457 ln = (struct llentry *)arg;
458 LLE_WLOCK_ASSERT(ln);
459 ifp = ln->lle_tbl->llt_ifp;
461 CURVNET_SET(ifp->if_vnet);
463 if (ln->ln_ntick > 0) {
464 if (ln->ln_ntick > INT_MAX) {
465 ln->ln_ntick -= INT_MAX;
466 nd6_llinfo_settimer_locked(ln, INT_MAX);
469 nd6_llinfo_settimer_locked(ln, ln->ln_ntick);
474 ndi = ND_IFINFO(ifp);
475 dst = &L3_ADDR_SIN6(ln)->sin6_addr;
476 if (ln->la_flags & LLE_STATIC) {
480 if (ln->la_flags & LLE_DELETED) {
481 (void)nd6_free(ln, 0);
486 switch (ln->ln_state) {
487 case ND6_LLINFO_INCOMPLETE:
488 if (ln->la_asked < V_nd6_mmaxtries) {
490 nd6_llinfo_settimer_locked(ln, (long)ndi->retrans * hz / 1000);
492 nd6_ns_output(ifp, NULL, dst, ln, 0);
495 struct mbuf *m = ln->la_hold;
500 * assuming every packet in la_hold has the
501 * same IP header. Send error after unlock.
506 clear_llinfo_pqueue(ln);
508 (void)nd6_free(ln, 0);
511 icmp6_error2(m, ICMP6_DST_UNREACH,
512 ICMP6_DST_UNREACH_ADDR, 0, ifp);
515 case ND6_LLINFO_REACHABLE:
516 if (!ND6_LLINFO_PERMANENT(ln)) {
517 ln->ln_state = ND6_LLINFO_STALE;
518 nd6_llinfo_settimer_locked(ln, (long)V_nd6_gctimer * hz);
522 case ND6_LLINFO_STALE:
523 /* Garbage Collection(RFC 2461 5.3) */
524 if (!ND6_LLINFO_PERMANENT(ln)) {
525 (void)nd6_free(ln, 1);
530 case ND6_LLINFO_DELAY:
531 if (ndi && (ndi->flags & ND6_IFF_PERFORMNUD) != 0) {
534 ln->ln_state = ND6_LLINFO_PROBE;
535 nd6_llinfo_settimer_locked(ln, (long)ndi->retrans * hz / 1000);
537 nd6_ns_output(ifp, dst, dst, ln, 0);
540 ln->ln_state = ND6_LLINFO_STALE; /* XXX */
541 nd6_llinfo_settimer_locked(ln, (long)V_nd6_gctimer * hz);
544 case ND6_LLINFO_PROBE:
545 if (ln->la_asked < V_nd6_umaxtries) {
547 nd6_llinfo_settimer_locked(ln, (long)ndi->retrans * hz / 1000);
549 nd6_ns_output(ifp, dst, dst, ln, 0);
552 (void)nd6_free(ln, 0);
557 panic("%s: paths in a dark night can be confusing: %d",
558 __func__, ln->ln_state);
568 * ND6 timer routine to expire default route list and prefix list
573 CURVNET_SET((struct vnet *) arg);
575 struct nd_defrouter *dr, *ndr;
576 struct nd_prefix *pr, *npr;
577 struct in6_ifaddr *ia6, *nia6;
578 struct in6_addrlifetime *lt6;
580 callout_reset(&V_nd6_timer_ch, V_nd6_prune * hz,
583 /* expire default router list */
585 TAILQ_FOREACH_SAFE(dr, &V_nd_defrouter, dr_entry, ndr) {
586 if (dr->expire && dr->expire < time_second)
591 * expire interface addresses.
592 * in the past the loop was inside prefix expiry processing.
593 * However, from a stricter speci-confrmance standpoint, we should
594 * rather separate address lifetimes and prefix lifetimes.
596 * XXXRW: in6_ifaddrhead locking.
599 TAILQ_FOREACH_SAFE(ia6, &V_in6_ifaddrhead, ia_link, nia6) {
600 /* check address lifetime */
601 lt6 = &ia6->ia6_lifetime;
602 if (IFA6_IS_INVALID(ia6)) {
606 * If the expiring address is temporary, try
607 * regenerating a new one. This would be useful when
608 * we suspended a laptop PC, then turned it on after a
609 * period that could invalidate all temporary
610 * addresses. Although we may have to restart the
611 * loop (see below), it must be after purging the
612 * address. Otherwise, we'd see an infinite loop of
615 if (V_ip6_use_tempaddr &&
616 (ia6->ia6_flags & IN6_IFF_TEMPORARY) != 0) {
617 if (regen_tmpaddr(ia6) == 0)
621 in6_purgeaddr(&ia6->ia_ifa);
624 goto addrloop; /* XXX: see below */
625 } else if (IFA6_IS_DEPRECATED(ia6)) {
626 int oldflags = ia6->ia6_flags;
628 ia6->ia6_flags |= IN6_IFF_DEPRECATED;
631 * If a temporary address has just become deprecated,
632 * regenerate a new one if possible.
634 if (V_ip6_use_tempaddr &&
635 (ia6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
636 (oldflags & IN6_IFF_DEPRECATED) == 0) {
638 if (regen_tmpaddr(ia6) == 0) {
640 * A new temporary address is
642 * XXX: this means the address chain
643 * has changed while we are still in
644 * the loop. Although the change
645 * would not cause disaster (because
646 * it's not a deletion, but an
647 * addition,) we'd rather restart the
648 * loop just for safety. Or does this
649 * significantly reduce performance??
656 * A new RA might have made a deprecated address
659 ia6->ia6_flags &= ~IN6_IFF_DEPRECATED;
663 /* expire prefix list */
664 LIST_FOREACH_SAFE(pr, &V_nd_prefix, ndpr_entry, npr) {
666 * check prefix lifetime.
667 * since pltime is just for autoconf, pltime processing for
668 * prefix is not necessary.
670 if (pr->ndpr_vltime != ND6_INFINITE_LIFETIME &&
671 time_second - pr->ndpr_lastupdate > pr->ndpr_vltime) {
674 * address expiration and prefix expiration are
675 * separate. NEVER perform in6_purgeaddr here.
685 * ia6 - deprecated/invalidated temporary address
688 regen_tmpaddr(struct in6_ifaddr *ia6)
692 struct in6_ifaddr *public_ifa6 = NULL;
694 ifp = ia6->ia_ifa.ifa_ifp;
696 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
697 struct in6_ifaddr *it6;
699 if (ifa->ifa_addr->sa_family != AF_INET6)
702 it6 = (struct in6_ifaddr *)ifa;
704 /* ignore no autoconf addresses. */
705 if ((it6->ia6_flags & IN6_IFF_AUTOCONF) == 0)
708 /* ignore autoconf addresses with different prefixes. */
709 if (it6->ia6_ndpr == NULL || it6->ia6_ndpr != ia6->ia6_ndpr)
713 * Now we are looking at an autoconf address with the same
714 * prefix as ours. If the address is temporary and is still
715 * preferred, do not create another one. It would be rare, but
716 * could happen, for example, when we resume a laptop PC after
719 if ((it6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
720 !IFA6_IS_DEPRECATED(it6)) {
726 * This is a public autoconf address that has the same prefix
727 * as ours. If it is preferred, keep it. We can't break the
728 * loop here, because there may be a still-preferred temporary
729 * address with the prefix.
731 if (!IFA6_IS_DEPRECATED(it6))
734 if (public_ifa6 != NULL)
735 ifa_ref(&public_ifa6->ia_ifa);
737 IF_ADDR_RUNLOCK(ifp);
739 if (public_ifa6 != NULL) {
742 if ((e = in6_tmpifadd(public_ifa6, 0, 0)) != 0) {
743 ifa_free(&public_ifa6->ia_ifa);
744 log(LOG_NOTICE, "regen_tmpaddr: failed to create a new"
745 " tmp addr,errno=%d\n", e);
748 ifa_free(&public_ifa6->ia_ifa);
756 * Nuke neighbor cache/prefix/default router management table, right before
760 nd6_purge(struct ifnet *ifp)
762 struct nd_defrouter *dr, *ndr;
763 struct nd_prefix *pr, *npr;
766 * Nuke default router list entries toward ifp.
767 * We defer removal of default router list entries that is installed
768 * in the routing table, in order to keep additional side effects as
771 TAILQ_FOREACH_SAFE(dr, &V_nd_defrouter, dr_entry, ndr) {
779 TAILQ_FOREACH_SAFE(dr, &V_nd_defrouter, dr_entry, ndr) {
787 /* Nuke prefix list entries toward ifp */
788 LIST_FOREACH_SAFE(pr, &V_nd_prefix, ndpr_entry, npr) {
789 if (pr->ndpr_ifp == ifp) {
791 * Because if_detach() does *not* release prefixes
792 * while purging addresses the reference count will
793 * still be above zero. We therefore reset it to
794 * make sure that the prefix really gets purged.
799 * Previously, pr->ndpr_addr is removed as well,
800 * but I strongly believe we don't have to do it.
801 * nd6_purge() is only called from in6_ifdetach(),
802 * which removes all the associated interface addresses
804 * (jinmei@kame.net 20010129)
810 /* cancel default outgoing interface setting */
811 if (V_nd6_defifindex == ifp->if_index)
812 nd6_setdefaultiface(0);
814 if (ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV) {
815 /* Refresh default router list. */
820 * We do not nuke the neighbor cache entries here any more
821 * because the neighbor cache is kept in if_afdata[AF_INET6].
822 * nd6_purge() is invoked by in6_ifdetach() which is called
823 * from if_detach() where everything gets purged. So let
824 * in6_domifdetach() do the actual L2 table purging work.
829 * the caller acquires and releases the lock on the lltbls
830 * Returns the llentry locked
833 nd6_lookup(struct in6_addr *addr6, int flags, struct ifnet *ifp)
835 struct sockaddr_in6 sin6;
839 bzero(&sin6, sizeof(sin6));
840 sin6.sin6_len = sizeof(struct sockaddr_in6);
841 sin6.sin6_family = AF_INET6;
842 sin6.sin6_addr = *addr6;
844 IF_AFDATA_LOCK_ASSERT(ifp);
847 if (flags & ND6_CREATE)
848 llflags |= LLE_CREATE;
849 if (flags & ND6_EXCLUSIVE)
850 llflags |= LLE_EXCLUSIVE;
852 ln = lla_lookup(LLTABLE6(ifp), llflags, (struct sockaddr *)&sin6);
853 if ((ln != NULL) && (llflags & LLE_CREATE))
854 ln->ln_state = ND6_LLINFO_NOSTATE;
860 * Test whether a given IPv6 address is a neighbor or not, ignoring
861 * the actual neighbor cache. The neighbor cache is ignored in order
862 * to not reenter the routing code from within itself.
865 nd6_is_new_addr_neighbor(struct sockaddr_in6 *addr, struct ifnet *ifp)
867 struct nd_prefix *pr;
868 struct ifaddr *dstaddr;
871 * A link-local address is always a neighbor.
872 * XXX: a link does not necessarily specify a single interface.
874 if (IN6_IS_ADDR_LINKLOCAL(&addr->sin6_addr)) {
875 struct sockaddr_in6 sin6_copy;
879 * We need sin6_copy since sa6_recoverscope() may modify the
883 if (sa6_recoverscope(&sin6_copy))
884 return (0); /* XXX: should be impossible */
885 if (in6_setscope(&sin6_copy.sin6_addr, ifp, &zone))
887 if (sin6_copy.sin6_scope_id == zone)
894 * If the address matches one of our addresses,
895 * it should be a neighbor.
896 * If the address matches one of our on-link prefixes, it should be a
899 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
900 if (pr->ndpr_ifp != ifp)
903 if (!(pr->ndpr_stateflags & NDPRF_ONLINK)) {
905 rt = rtalloc1((struct sockaddr *)&pr->ndpr_prefix, 0, 0);
909 * This is the case where multiple interfaces
910 * have the same prefix, but only one is installed
911 * into the routing table and that prefix entry
912 * is not the one being examined here. In the case
913 * where RADIX_MPATH is enabled, multiple route
914 * entries (of the same rt_key value) will be
915 * installed because the interface addresses all
918 if (!IN6_ARE_ADDR_EQUAL(&pr->ndpr_prefix.sin6_addr,
919 &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr)) {
926 if (IN6_ARE_MASKED_ADDR_EQUAL(&pr->ndpr_prefix.sin6_addr,
927 &addr->sin6_addr, &pr->ndpr_mask))
932 * If the address is assigned on the node of the other side of
933 * a p2p interface, the address should be a neighbor.
935 dstaddr = ifa_ifwithdstaddr((struct sockaddr *)addr);
936 if (dstaddr != NULL) {
937 if (dstaddr->ifa_ifp == ifp) {
945 * If the default router list is empty, all addresses are regarded
946 * as on-link, and thus, as a neighbor.
948 if (ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV &&
949 TAILQ_EMPTY(&V_nd_defrouter) &&
950 V_nd6_defifindex == ifp->if_index) {
959 * Detect if a given IPv6 address identifies a neighbor on a given link.
960 * XXX: should take care of the destination of a p2p link?
963 nd6_is_addr_neighbor(struct sockaddr_in6 *addr, struct ifnet *ifp)
968 IF_AFDATA_UNLOCK_ASSERT(ifp);
969 if (nd6_is_new_addr_neighbor(addr, ifp))
973 * Even if the address matches none of our addresses, it might be
974 * in the neighbor cache.
977 if ((lle = nd6_lookup(&addr->sin6_addr, 0, ifp)) != NULL) {
981 IF_AFDATA_UNLOCK(ifp);
986 * Free an nd6 llinfo entry.
987 * Since the function would cause significant changes in the kernel, DO NOT
988 * make it global, unless you have a strong reason for the change, and are sure
989 * that the change is safe.
991 static struct llentry *
992 nd6_free(struct llentry *ln, int gc)
994 struct llentry *next;
995 struct nd_defrouter *dr;
998 LLE_WLOCK_ASSERT(ln);
1001 * we used to have pfctlinput(PRC_HOSTDEAD) here.
1002 * even though it is not harmful, it was not really necessary.
1006 nd6_llinfo_settimer_locked(ln, -1);
1008 ifp = ln->lle_tbl->llt_ifp;
1010 if (ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV) {
1011 dr = defrouter_lookup(&L3_ADDR_SIN6(ln)->sin6_addr, ifp);
1013 if (dr != NULL && dr->expire &&
1014 ln->ln_state == ND6_LLINFO_STALE && gc) {
1016 * If the reason for the deletion is just garbage
1017 * collection, and the neighbor is an active default
1018 * router, do not delete it. Instead, reset the GC
1019 * timer using the router's lifetime.
1020 * Simply deleting the entry would affect default
1021 * router selection, which is not necessarily a good
1022 * thing, especially when we're using router preference
1024 * XXX: the check for ln_state would be redundant,
1025 * but we intentionally keep it just in case.
1027 if (dr->expire > time_second)
1028 nd6_llinfo_settimer_locked(ln,
1029 (dr->expire - time_second) * hz);
1031 nd6_llinfo_settimer_locked(ln,
1032 (long)V_nd6_gctimer * hz);
1034 next = LIST_NEXT(ln, lle_next);
1042 * Unreachablity of a router might affect the default
1043 * router selection and on-link detection of advertised
1048 * Temporarily fake the state to choose a new default
1049 * router and to perform on-link determination of
1050 * prefixes correctly.
1051 * Below the state will be set correctly,
1052 * or the entry itself will be deleted.
1054 ln->ln_state = ND6_LLINFO_INCOMPLETE;
1057 if (ln->ln_router || dr) {
1060 * We need to unlock to avoid a LOR with rt6_flush() with the
1061 * rnh and for the calls to pfxlist_onlink_check() and
1062 * defrouter_select() in the block further down for calls
1063 * into nd6_lookup(). We still hold a ref.
1068 * rt6_flush must be called whether or not the neighbor
1069 * is in the Default Router List.
1070 * See a corresponding comment in nd6_na_input().
1072 rt6_flush(&L3_ADDR_SIN6(ln)->sin6_addr, ifp);
1077 * Since defrouter_select() does not affect the
1078 * on-link determination and MIP6 needs the check
1079 * before the default router selection, we perform
1082 pfxlist_onlink_check();
1085 * Refresh default router list.
1090 if (ln->ln_router || dr)
1095 * Before deleting the entry, remember the next entry as the
1096 * return value. We need this because pfxlist_onlink_check() above
1097 * might have freed other entries (particularly the old next entry) as
1098 * a side effect (XXX).
1100 next = LIST_NEXT(ln, lle_next);
1103 * Save to unlock. We still hold an extra reference and will not
1104 * free(9) in llentry_free() if someone else holds one as well.
1107 IF_AFDATA_LOCK(ifp);
1111 IF_AFDATA_UNLOCK(ifp);
1117 * Upper-layer reachability hint for Neighbor Unreachability Detection.
1119 * XXX cost-effective methods?
1122 nd6_nud_hint(struct rtentry *rt, struct in6_addr *dst6, int force)
1127 if ((dst6 == NULL) || (rt == NULL))
1131 IF_AFDATA_LOCK(ifp);
1132 ln = nd6_lookup(dst6, ND6_EXCLUSIVE, NULL);
1133 IF_AFDATA_UNLOCK(ifp);
1137 if (ln->ln_state < ND6_LLINFO_REACHABLE)
1141 * if we get upper-layer reachability confirmation many times,
1142 * it is possible we have false information.
1146 if (ln->ln_byhint > V_nd6_maxnudhint) {
1151 ln->ln_state = ND6_LLINFO_REACHABLE;
1152 if (!ND6_LLINFO_PERMANENT(ln)) {
1153 nd6_llinfo_settimer_locked(ln,
1154 (long)ND_IFINFO(rt->rt_ifp)->reachable * hz);
1162 * Rejuvenate this function for routing operations related
1166 nd6_rtrequest(int req, struct rtentry *rt, struct rt_addrinfo *info)
1168 struct sockaddr_in6 *gateway = (struct sockaddr_in6 *)rt->rt_gateway;
1169 struct nd_defrouter *dr;
1170 struct ifnet *ifp = rt->rt_ifp;
1182 * Only indirect routes are interesting.
1184 if ((rt->rt_flags & RTF_GATEWAY) == 0)
1187 * check for default route
1189 if (IN6_ARE_ADDR_EQUAL(&in6addr_any,
1190 &SIN6(rt_key(rt))->sin6_addr)) {
1192 dr = defrouter_lookup(&gateway->sin6_addr, ifp);
1202 nd6_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp)
1204 struct in6_drlist *drl = (struct in6_drlist *)data;
1205 struct in6_oprlist *oprl = (struct in6_oprlist *)data;
1206 struct in6_ndireq *ndi = (struct in6_ndireq *)data;
1207 struct in6_nbrinfo *nbi = (struct in6_nbrinfo *)data;
1208 struct in6_ndifreq *ndif = (struct in6_ndifreq *)data;
1209 struct nd_defrouter *dr;
1210 struct nd_prefix *pr;
1211 int i = 0, error = 0;
1215 case SIOCGDRLST_IN6:
1217 * obsolete API, use sysctl under net.inet6.icmp6
1219 bzero(drl, sizeof(*drl));
1221 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) {
1224 drl->defrouter[i].rtaddr = dr->rtaddr;
1225 in6_clearscope(&drl->defrouter[i].rtaddr);
1227 drl->defrouter[i].flags = dr->flags;
1228 drl->defrouter[i].rtlifetime = dr->rtlifetime;
1229 drl->defrouter[i].expire = dr->expire;
1230 drl->defrouter[i].if_index = dr->ifp->if_index;
1235 case SIOCGPRLST_IN6:
1237 * obsolete API, use sysctl under net.inet6.icmp6
1239 * XXX the structure in6_prlist was changed in backward-
1240 * incompatible manner. in6_oprlist is used for SIOCGPRLST_IN6,
1241 * in6_prlist is used for nd6_sysctl() - fill_prlist().
1244 * XXX meaning of fields, especialy "raflags", is very
1245 * differnet between RA prefix list and RR/static prefix list.
1246 * how about separating ioctls into two?
1248 bzero(oprl, sizeof(*oprl));
1250 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
1251 struct nd_pfxrouter *pfr;
1256 oprl->prefix[i].prefix = pr->ndpr_prefix.sin6_addr;
1257 oprl->prefix[i].raflags = pr->ndpr_raf;
1258 oprl->prefix[i].prefixlen = pr->ndpr_plen;
1259 oprl->prefix[i].vltime = pr->ndpr_vltime;
1260 oprl->prefix[i].pltime = pr->ndpr_pltime;
1261 oprl->prefix[i].if_index = pr->ndpr_ifp->if_index;
1262 if (pr->ndpr_vltime == ND6_INFINITE_LIFETIME)
1263 oprl->prefix[i].expire = 0;
1267 /* XXX: we assume time_t is signed. */
1270 ((sizeof(maxexpire) * 8) - 1));
1271 if (pr->ndpr_vltime <
1272 maxexpire - pr->ndpr_lastupdate) {
1273 oprl->prefix[i].expire =
1274 pr->ndpr_lastupdate +
1277 oprl->prefix[i].expire = maxexpire;
1281 LIST_FOREACH(pfr, &pr->ndpr_advrtrs, pfr_entry) {
1283 #define RTRADDR oprl->prefix[i].advrtr[j]
1284 RTRADDR = pfr->router->rtaddr;
1285 in6_clearscope(&RTRADDR);
1290 oprl->prefix[i].advrtrs = j;
1291 oprl->prefix[i].origin = PR_ORIG_RA;
1298 case OSIOCGIFINFO_IN6:
1300 /* XXX: old ndp(8) assumes a positive value for linkmtu. */
1301 bzero(&ND, sizeof(ND));
1302 ND.linkmtu = IN6_LINKMTU(ifp);
1303 ND.maxmtu = ND_IFINFO(ifp)->maxmtu;
1304 ND.basereachable = ND_IFINFO(ifp)->basereachable;
1305 ND.reachable = ND_IFINFO(ifp)->reachable;
1306 ND.retrans = ND_IFINFO(ifp)->retrans;
1307 ND.flags = ND_IFINFO(ifp)->flags;
1308 ND.recalctm = ND_IFINFO(ifp)->recalctm;
1309 ND.chlim = ND_IFINFO(ifp)->chlim;
1311 case SIOCGIFINFO_IN6:
1312 ND = *ND_IFINFO(ifp);
1314 case SIOCSIFINFO_IN6:
1316 * used to change host variables from userland.
1317 * intented for a use on router to reflect RA configurations.
1319 /* 0 means 'unspecified' */
1320 if (ND.linkmtu != 0) {
1321 if (ND.linkmtu < IPV6_MMTU ||
1322 ND.linkmtu > IN6_LINKMTU(ifp)) {
1326 ND_IFINFO(ifp)->linkmtu = ND.linkmtu;
1329 if (ND.basereachable != 0) {
1330 int obasereachable = ND_IFINFO(ifp)->basereachable;
1332 ND_IFINFO(ifp)->basereachable = ND.basereachable;
1333 if (ND.basereachable != obasereachable)
1334 ND_IFINFO(ifp)->reachable =
1335 ND_COMPUTE_RTIME(ND.basereachable);
1337 if (ND.retrans != 0)
1338 ND_IFINFO(ifp)->retrans = ND.retrans;
1340 ND_IFINFO(ifp)->chlim = ND.chlim;
1342 case SIOCSIFINFO_FLAGS:
1345 struct in6_ifaddr *ia;
1348 * Try to clear ifdisabled flag when enabling
1349 * accept_rtadv or auto_linklocal.
1351 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) &&
1352 !(ND.flags & ND6_IFF_IFDISABLED) &&
1353 (ND.flags & (ND6_IFF_ACCEPT_RTADV |
1354 ND6_IFF_AUTO_LINKLOCAL)))
1355 ND.flags &= ~ND6_IFF_IFDISABLED;
1357 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) &&
1358 !(ND.flags & ND6_IFF_IFDISABLED)) {
1359 /* ifdisabled 1->0 transision */
1362 * If the interface is marked as ND6_IFF_IFDISABLED and
1363 * has an link-local address with IN6_IFF_DUPLICATED,
1364 * do not clear ND6_IFF_IFDISABLED.
1365 * See RFC 4862, Section 5.4.5.
1367 int duplicated_linklocal = 0;
1370 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1371 if (ifa->ifa_addr->sa_family != AF_INET6)
1373 ia = (struct in6_ifaddr *)ifa;
1374 if ((ia->ia6_flags & IN6_IFF_DUPLICATED) &&
1375 IN6_IS_ADDR_LINKLOCAL(IA6_IN6(ia))) {
1376 duplicated_linklocal = 1;
1380 IF_ADDR_RUNLOCK(ifp);
1382 if (duplicated_linklocal) {
1383 ND.flags |= ND6_IFF_IFDISABLED;
1384 log(LOG_ERR, "Cannot enable an interface"
1385 " with a link-local address marked"
1388 ND_IFINFO(ifp)->flags &= ~ND6_IFF_IFDISABLED;
1389 if (ifp->if_flags & IFF_UP)
1392 } else if (!(ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) &&
1393 (ND.flags & ND6_IFF_IFDISABLED)) {
1394 /* ifdisabled 0->1 transision */
1395 /* Mark all IPv6 address as tentative. */
1397 ND_IFINFO(ifp)->flags |= ND6_IFF_IFDISABLED;
1399 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1400 if (ifa->ifa_addr->sa_family != AF_INET6)
1402 ia = (struct in6_ifaddr *)ifa;
1403 ia->ia6_flags |= IN6_IFF_TENTATIVE;
1405 IF_ADDR_RUNLOCK(ifp);
1408 if (ND.flags & ND6_IFF_AUTO_LINKLOCAL) {
1409 if (!(ND_IFINFO(ifp)->flags & ND6_IFF_AUTO_LINKLOCAL)) {
1410 /* auto_linklocal 0->1 transision */
1412 /* If no link-local address on ifp, configure */
1413 ND_IFINFO(ifp)->flags |= ND6_IFF_AUTO_LINKLOCAL;
1414 in6_ifattach(ifp, NULL);
1415 } else if (!(ND.flags & ND6_IFF_IFDISABLED) &&
1416 ifp->if_flags & IFF_UP) {
1418 * When the IF already has
1419 * ND6_IFF_AUTO_LINKLOCAL, no link-local
1420 * address is assigned, and IFF_UP, try to
1423 int haslinklocal = 0;
1426 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1427 if (ifa->ifa_addr->sa_family != AF_INET6)
1429 ia = (struct in6_ifaddr *)ifa;
1430 if (IN6_IS_ADDR_LINKLOCAL(IA6_IN6(ia))) {
1435 IF_ADDR_RUNLOCK(ifp);
1437 in6_ifattach(ifp, NULL);
1441 ND_IFINFO(ifp)->flags = ND.flags;
1444 case SIOCSNDFLUSH_IN6: /* XXX: the ioctl name is confusing... */
1445 /* sync kernel routing table with the default router list */
1449 case SIOCSPFXFLUSH_IN6:
1451 /* flush all the prefix advertised by routers */
1452 struct nd_prefix *pr, *next;
1455 LIST_FOREACH_SAFE(pr, &V_nd_prefix, ndpr_entry, next) {
1456 struct in6_ifaddr *ia, *ia_next;
1458 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
1461 /* do we really have to remove addresses as well? */
1462 /* XXXRW: in6_ifaddrhead locking. */
1463 TAILQ_FOREACH_SAFE(ia, &V_in6_ifaddrhead, ia_link,
1465 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) == 0)
1468 if (ia->ia6_ndpr == pr)
1469 in6_purgeaddr(&ia->ia_ifa);
1476 case SIOCSRTRFLUSH_IN6:
1478 /* flush all the default routers */
1479 struct nd_defrouter *dr, *next;
1483 TAILQ_FOREACH_SAFE(dr, &V_nd_defrouter, dr_entry, next) {
1490 case SIOCGNBRINFO_IN6:
1493 struct in6_addr nb_addr = nbi->addr; /* make local for safety */
1495 if ((error = in6_setscope(&nb_addr, ifp, NULL)) != 0)
1498 IF_AFDATA_LOCK(ifp);
1499 ln = nd6_lookup(&nb_addr, 0, ifp);
1500 IF_AFDATA_UNLOCK(ifp);
1506 nbi->state = ln->ln_state;
1507 nbi->asked = ln->la_asked;
1508 nbi->isrouter = ln->ln_router;
1509 nbi->expire = ln->la_expire;
1513 case SIOCGDEFIFACE_IN6: /* XXX: should be implemented as a sysctl? */
1514 ndif->ifindex = V_nd6_defifindex;
1516 case SIOCSDEFIFACE_IN6: /* XXX: should be implemented as a sysctl? */
1517 return (nd6_setdefaultiface(ndif->ifindex));
1523 * Create neighbor cache entry and cache link-layer address,
1524 * on reception of inbound ND6 packets. (RS/RA/NS/redirect)
1527 * code - type dependent information
1530 * The caller of this function already acquired the ndp
1531 * cache table lock because the cache entry is returned.
1534 nd6_cache_lladdr(struct ifnet *ifp, struct in6_addr *from, char *lladdr,
1535 int lladdrlen, int type, int code)
1537 struct llentry *ln = NULL;
1544 uint16_t router = 0;
1545 struct sockaddr_in6 sin6;
1546 struct mbuf *chain = NULL;
1547 int static_route = 0;
1549 IF_AFDATA_UNLOCK_ASSERT(ifp);
1552 panic("ifp == NULL in nd6_cache_lladdr");
1554 panic("from == NULL in nd6_cache_lladdr");
1556 /* nothing must be updated for unspecified address */
1557 if (IN6_IS_ADDR_UNSPECIFIED(from))
1561 * Validation about ifp->if_addrlen and lladdrlen must be done in
1564 * XXX If the link does not have link-layer adderss, what should
1565 * we do? (ifp->if_addrlen == 0)
1566 * Spec says nothing in sections for RA, RS and NA. There's small
1567 * description on it in NS section (RFC 2461 7.2.3).
1569 flags = lladdr ? ND6_EXCLUSIVE : 0;
1570 IF_AFDATA_LOCK(ifp);
1571 ln = nd6_lookup(from, flags, ifp);
1574 flags |= ND6_EXCLUSIVE;
1575 ln = nd6_lookup(from, flags | ND6_CREATE, ifp);
1576 IF_AFDATA_UNLOCK(ifp);
1579 IF_AFDATA_UNLOCK(ifp);
1580 /* do nothing if static ndp is set */
1581 if (ln->la_flags & LLE_STATIC) {
1590 olladdr = (ln->la_flags & LLE_VALID) ? 1 : 0;
1591 if (olladdr && lladdr) {
1592 llchange = bcmp(lladdr, &ln->ll_addr,
1598 * newentry olladdr lladdr llchange (*=record)
1601 * 0 n y -- (3) * STALE
1603 * 0 y y y (5) * STALE
1604 * 1 -- n -- (6) NOSTATE(= PASSIVE)
1605 * 1 -- y -- (7) * STALE
1608 if (lladdr) { /* (3-5) and (7) */
1610 * Record source link-layer address
1611 * XXX is it dependent to ifp->if_type?
1613 bcopy(lladdr, &ln->ll_addr, ifp->if_addrlen);
1614 ln->la_flags |= LLE_VALID;
1618 if ((!olladdr && lladdr != NULL) || /* (3) */
1619 (olladdr && lladdr != NULL && llchange)) { /* (5) */
1621 newstate = ND6_LLINFO_STALE;
1622 } else /* (1-2,4) */
1626 if (lladdr == NULL) /* (6) */
1627 newstate = ND6_LLINFO_NOSTATE;
1629 newstate = ND6_LLINFO_STALE;
1634 * Update the state of the neighbor cache.
1636 ln->ln_state = newstate;
1638 if (ln->ln_state == ND6_LLINFO_STALE) {
1640 * XXX: since nd6_output() below will cause
1641 * state tansition to DELAY and reset the timer,
1642 * we must set the timer now, although it is actually
1645 nd6_llinfo_settimer_locked(ln, (long)V_nd6_gctimer * hz);
1648 struct mbuf *m_hold, *m_hold_next;
1651 * reset the la_hold in advance, to explicitly
1652 * prevent a la_hold lookup in nd6_output()
1653 * (wouldn't happen, though...)
1655 for (m_hold = ln->la_hold, ln->la_hold = NULL;
1656 m_hold; m_hold = m_hold_next) {
1657 m_hold_next = m_hold->m_nextpkt;
1658 m_hold->m_nextpkt = NULL;
1661 * we assume ifp is not a p2p here, so
1662 * just set the 2nd argument as the
1665 nd6_output_lle(ifp, ifp, m_hold, L3_ADDR_SIN6(ln), NULL, ln, &chain);
1668 * If we have mbufs in the chain we need to do
1669 * deferred transmit. Copy the address from the
1670 * llentry before dropping the lock down below.
1673 memcpy(&sin6, L3_ADDR_SIN6(ln), sizeof(sin6));
1675 } else if (ln->ln_state == ND6_LLINFO_INCOMPLETE) {
1676 /* probe right away */
1677 nd6_llinfo_settimer_locked((void *)ln, 0);
1682 * ICMP6 type dependent behavior.
1684 * NS: clear IsRouter if new entry
1685 * RS: clear IsRouter
1686 * RA: set IsRouter if there's lladdr
1687 * redir: clear IsRouter if new entry
1690 * The spec says that we must set IsRouter in the following cases:
1691 * - If lladdr exist, set IsRouter. This means (1-5).
1692 * - If it is old entry (!newentry), set IsRouter. This means (7).
1693 * So, based on the spec, in (1-5) and (7) cases we must set IsRouter.
1694 * A quetion arises for (1) case. (1) case has no lladdr in the
1695 * neighbor cache, this is similar to (6).
1696 * This case is rare but we figured that we MUST NOT set IsRouter.
1698 * newentry olladdr lladdr llchange NS RS RA redir
1700 * 0 n n -- (1) c ? s
1701 * 0 y n -- (2) c s s
1702 * 0 n y -- (3) c s s
1705 * 1 -- n -- (6) c c c s
1706 * 1 -- y -- (7) c c s c s
1710 switch (type & 0xff) {
1711 case ND_NEIGHBOR_SOLICIT:
1713 * New entry must have is_router flag cleared.
1715 if (is_newentry) /* (6-7) */
1720 * If the icmp is a redirect to a better router, always set the
1721 * is_router flag. Otherwise, if the entry is newly created,
1722 * clear the flag. [RFC 2461, sec 8.3]
1724 if (code == ND_REDIRECT_ROUTER)
1726 else if (is_newentry) /* (6-7) */
1729 case ND_ROUTER_SOLICIT:
1731 * is_router flag must always be cleared.
1735 case ND_ROUTER_ADVERT:
1737 * Mark an entry with lladdr as a router.
1739 if ((!is_newentry && (olladdr || lladdr)) || /* (2-5) */
1740 (is_newentry && lladdr)) { /* (7) */
1747 static_route = (ln->la_flags & LLE_STATIC);
1748 router = ln->ln_router;
1750 if (flags & ND6_EXCLUSIVE)
1758 nd6_output_flush(ifp, ifp, chain, &sin6, NULL);
1761 * When the link-layer address of a router changes, select the
1762 * best router again. In particular, when the neighbor entry is newly
1763 * created, it might affect the selection policy.
1764 * Question: can we restrict the first condition to the "is_newentry"
1766 * XXX: when we hear an RA from a new router with the link-layer
1767 * address option, defrouter_select() is called twice, since
1768 * defrtrlist_update called the function as well. However, I believe
1769 * we can compromise the overhead, since it only happens the first
1771 * XXX: although defrouter_select() should not have a bad effect
1772 * for those are not autoconfigured hosts, we explicitly avoid such
1775 if (do_update && router &&
1776 ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV) {
1778 * guaranteed recursion
1786 if (flags & ND6_EXCLUSIVE)
1797 nd6_slowtimo(void *arg)
1799 CURVNET_SET((struct vnet *) arg);
1800 struct nd_ifinfo *nd6if;
1803 callout_reset(&V_nd6_slowtimo_ch, ND6_SLOWTIMER_INTERVAL * hz,
1804 nd6_slowtimo, curvnet);
1805 IFNET_RLOCK_NOSLEEP();
1806 TAILQ_FOREACH(ifp, &V_ifnet, if_list) {
1807 nd6if = ND_IFINFO(ifp);
1808 if (nd6if->basereachable && /* already initialized */
1809 (nd6if->recalctm -= ND6_SLOWTIMER_INTERVAL) <= 0) {
1811 * Since reachable time rarely changes by router
1812 * advertisements, we SHOULD insure that a new random
1813 * value gets recomputed at least once every few hours.
1816 nd6if->recalctm = V_nd6_recalc_reachtm_interval;
1817 nd6if->reachable = ND_COMPUTE_RTIME(nd6if->basereachable);
1820 IFNET_RUNLOCK_NOSLEEP();
1825 nd6_output(struct ifnet *ifp, struct ifnet *origifp, struct mbuf *m0,
1826 struct sockaddr_in6 *dst, struct rtentry *rt0)
1829 return (nd6_output_lle(ifp, origifp, m0, dst, rt0, NULL, NULL));
1834 * Note that I'm not enforcing any global serialization
1835 * lle state or asked changes here as the logic is too
1836 * complicated to avoid having to always acquire an exclusive
1841 #define senderr(e) { error = (e); goto bad;}
1844 nd6_output_lle(struct ifnet *ifp, struct ifnet *origifp, struct mbuf *m0,
1845 struct sockaddr_in6 *dst, struct rtentry *rt0, struct llentry *lle,
1846 struct mbuf **chain)
1848 struct mbuf *m = m0;
1850 struct llentry *ln = lle;
1851 struct ip6_hdr *ip6;
1859 LLE_WLOCK_ASSERT(lle);
1861 KASSERT(chain != NULL, (" lle locked but no mbuf chain pointer passed"));
1864 if (IN6_IS_ADDR_MULTICAST(&dst->sin6_addr))
1867 if (nd6_need_cache(ifp) == 0)
1871 * next hop determination. This routine is derived from ether_output.
1875 * Address resolution or Neighbor Unreachability Detection
1877 * At this point, the destination of the packet must be a unicast
1878 * or an anycast address(i.e. not a multicast).
1881 flags = ((m != NULL) || (lle != NULL)) ? LLE_EXCLUSIVE : 0;
1884 IF_AFDATA_LOCK(ifp);
1885 ln = lla_lookup(LLTABLE6(ifp), flags, (struct sockaddr *)dst);
1886 IF_AFDATA_UNLOCK(ifp);
1887 if ((ln == NULL) && nd6_is_addr_neighbor(dst, ifp)) {
1889 * Since nd6_is_addr_neighbor() internally calls nd6_lookup(),
1890 * the condition below is not very efficient. But we believe
1891 * it is tolerable, because this should be a rare case.
1893 flags = ND6_CREATE | (m ? ND6_EXCLUSIVE : 0);
1894 IF_AFDATA_LOCK(ifp);
1895 ln = nd6_lookup(&dst->sin6_addr, flags, ifp);
1896 IF_AFDATA_UNLOCK(ifp);
1900 if ((ifp->if_flags & IFF_POINTOPOINT) == 0 &&
1901 !(ND_IFINFO(ifp)->flags & ND6_IFF_PERFORMNUD)) {
1902 char ip6buf[INET6_ADDRSTRLEN];
1904 "nd6_output: can't allocate llinfo for %s "
1906 ip6_sprintf(ip6buf, &dst->sin6_addr), ln);
1907 senderr(EIO); /* XXX: good error? */
1909 goto sendpkt; /* send anyway */
1912 /* We don't have to do link-layer address resolution on a p2p link. */
1913 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 &&
1914 ln->ln_state < ND6_LLINFO_REACHABLE) {
1915 if ((flags & LLE_EXCLUSIVE) == 0) {
1916 flags |= LLE_EXCLUSIVE;
1919 ln->ln_state = ND6_LLINFO_STALE;
1920 nd6_llinfo_settimer_locked(ln, (long)V_nd6_gctimer * hz);
1924 * The first time we send a packet to a neighbor whose entry is
1925 * STALE, we have to change the state to DELAY and a sets a timer to
1926 * expire in DELAY_FIRST_PROBE_TIME seconds to ensure do
1927 * neighbor unreachability detection on expiration.
1930 if (ln->ln_state == ND6_LLINFO_STALE) {
1931 if ((flags & LLE_EXCLUSIVE) == 0) {
1932 flags |= LLE_EXCLUSIVE;
1937 ln->ln_state = ND6_LLINFO_DELAY;
1938 nd6_llinfo_settimer_locked(ln, (long)V_nd6_delay * hz);
1942 * If the neighbor cache entry has a state other than INCOMPLETE
1943 * (i.e. its link-layer address is already resolved), just
1946 if (ln->ln_state > ND6_LLINFO_INCOMPLETE)
1950 * There is a neighbor cache entry, but no ethernet address
1951 * response yet. Append this latest packet to the end of the
1952 * packet queue in the mbuf, unless the number of the packet
1953 * does not exceed nd6_maxqueuelen. When it exceeds nd6_maxqueuelen,
1954 * the oldest packet in the queue will be removed.
1956 if (ln->ln_state == ND6_LLINFO_NOSTATE)
1957 ln->ln_state = ND6_LLINFO_INCOMPLETE;
1959 if ((flags & LLE_EXCLUSIVE) == 0) {
1960 flags |= LLE_EXCLUSIVE;
1965 LLE_WLOCK_ASSERT(ln);
1968 struct mbuf *m_hold;
1972 for (m_hold = ln->la_hold; m_hold; m_hold = m_hold->m_nextpkt) {
1974 if (m_hold->m_nextpkt == NULL) {
1975 m_hold->m_nextpkt = m;
1979 while (i >= V_nd6_maxqueuelen) {
1980 m_hold = ln->la_hold;
1981 ln->la_hold = ln->la_hold->m_nextpkt;
1990 * If there has been no NS for the neighbor after entering the
1991 * INCOMPLETE state, send the first solicitation.
1993 if (!ND6_LLINFO_PERMANENT(ln) && ln->la_asked == 0) {
1996 nd6_llinfo_settimer_locked(ln,
1997 (long)ND_IFINFO(ifp)->retrans * hz / 1000);
1999 nd6_ns_output(ifp, NULL, &dst->sin6_addr, ln, 0);
2000 if (lle != NULL && ln == lle)
2003 } else if (lle == NULL || ln != lle) {
2005 * We did the lookup (no lle arg) so we
2006 * need to do the unlock here.
2014 /* discard the packet if IPv6 operation is disabled on the interface */
2015 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)) {
2016 error = ENETDOWN; /* better error? */
2020 * ln is valid and the caller did not pass in
2023 if ((ln != NULL) && (lle == NULL)) {
2024 if (flags & LLE_EXCLUSIVE)
2031 mac_netinet6_nd6_send(ifp, m);
2035 * If called from nd6_ns_output() (NS), nd6_na_output() (NA),
2036 * icmp6_redirect_output() (REDIRECT) or from rip6_output() (RS, RA
2037 * as handled by rtsol and rtadvd), mbufs will be tagged for SeND
2038 * to be diverted to user space. When re-injected into the kernel,
2039 * send_output() will directly dispatch them to the outgoing interface.
2041 if (send_sendso_input_hook != NULL) {
2042 mtag = m_tag_find(m, PACKET_TAG_ND_OUTGOING, NULL);
2044 ip6 = mtod(m, struct ip6_hdr *);
2045 ip6len = sizeof(struct ip6_hdr) + ntohs(ip6->ip6_plen);
2046 /* Use the SEND socket */
2047 error = send_sendso_input_hook(m, ifp, SND_OUT,
2049 /* -1 == no app on SEND socket */
2050 if (error == 0 || error != -1)
2056 * We were passed in a pointer to an lle with the lock held
2057 * this means that we can't call if_output as we will
2058 * recurse on the lle lock - so what we do is we create
2059 * a list of mbufs to send and transmit them in the caller
2060 * after the lock is dropped
2069 * append mbuf to end of deferred chain
2072 while (mb->m_nextpkt != NULL)
2078 if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
2079 return ((*ifp->if_output)(origifp, m, (struct sockaddr *)dst,
2082 error = (*ifp->if_output)(ifp, m, (struct sockaddr *)dst, NULL);
2087 * ln is valid and the caller did not pass in
2090 if ((ln != NULL) && (lle == NULL)) {
2091 if (flags & LLE_EXCLUSIVE)
2104 nd6_output_flush(struct ifnet *ifp, struct ifnet *origifp, struct mbuf *chain,
2105 struct sockaddr_in6 *dst, struct route *ro)
2107 struct mbuf *m, *m_head;
2108 struct ifnet *outifp;
2112 if ((ifp->if_flags & IFF_LOOPBACK) != 0)
2119 m_head = m_head->m_nextpkt;
2120 error = (*ifp->if_output)(ifp, m, (struct sockaddr *)dst, ro);
2125 * note that intermediate errors are blindly ignored - but this is
2126 * the same convention as used with nd6_output when called by
2134 nd6_need_cache(struct ifnet *ifp)
2137 * XXX: we currently do not make neighbor cache on any interface
2138 * other than ARCnet, Ethernet, FDDI and GIF.
2141 * - unidirectional tunnels needs no ND
2143 switch (ifp->if_type) {
2151 #ifdef IFT_IEEE80211
2154 case IFT_INFINIBAND:
2155 case IFT_GIF: /* XXX need more cases? */
2159 case IFT_PROPVIRTUAL:
2167 * the callers of this function need to be re-worked to drop
2168 * the lle lock, drop here for now
2171 nd6_storelladdr(struct ifnet *ifp, struct mbuf *m,
2172 struct sockaddr *dst, u_char *desten, struct llentry **lle)
2177 IF_AFDATA_UNLOCK_ASSERT(ifp);
2178 if (m->m_flags & M_MCAST) {
2181 switch (ifp->if_type) {
2187 #ifdef IFT_IEEE80211
2192 ETHER_MAP_IPV6_MULTICAST(&SIN6(dst)->sin6_addr,
2197 * netbsd can use if_broadcastaddr, but we don't do so
2198 * to reduce # of ifdef.
2200 for (i = 0; i < ifp->if_addrlen; i++)
2208 return (EAFNOSUPPORT);
2214 * the entry should have been created in nd6_store_lladdr
2216 IF_AFDATA_LOCK(ifp);
2217 ln = lla_lookup(LLTABLE6(ifp), 0, dst);
2218 IF_AFDATA_UNLOCK(ifp);
2219 if ((ln == NULL) || !(ln->la_flags & LLE_VALID)) {
2222 /* this could happen, if we could not allocate memory */
2227 bcopy(&ln->ll_addr, desten, ifp->if_addrlen);
2231 * A *small* use after free race exists here
2237 clear_llinfo_pqueue(struct llentry *ln)
2239 struct mbuf *m_hold, *m_hold_next;
2241 for (m_hold = ln->la_hold; m_hold; m_hold = m_hold_next) {
2242 m_hold_next = m_hold->m_nextpkt;
2243 m_hold->m_nextpkt = NULL;
2251 static int nd6_sysctl_drlist(SYSCTL_HANDLER_ARGS);
2252 static int nd6_sysctl_prlist(SYSCTL_HANDLER_ARGS);
2254 SYSCTL_DECL(_net_inet6_icmp6);
2256 SYSCTL_NODE(_net_inet6_icmp6, ICMPV6CTL_ND6_DRLIST, nd6_drlist,
2257 CTLFLAG_RD, nd6_sysctl_drlist, "");
2258 SYSCTL_NODE(_net_inet6_icmp6, ICMPV6CTL_ND6_PRLIST, nd6_prlist,
2259 CTLFLAG_RD, nd6_sysctl_prlist, "");
2260 SYSCTL_VNET_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_MAXQLEN, nd6_maxqueuelen,
2261 CTLFLAG_RW, &VNET_NAME(nd6_maxqueuelen), 1, "");
2264 nd6_sysctl_drlist(SYSCTL_HANDLER_ARGS)
2267 char buf[1024] __aligned(4);
2268 struct in6_defrouter *d, *de;
2269 struct nd_defrouter *dr;
2275 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) {
2276 d = (struct in6_defrouter *)buf;
2277 de = (struct in6_defrouter *)(buf + sizeof(buf));
2280 bzero(d, sizeof(*d));
2281 d->rtaddr.sin6_family = AF_INET6;
2282 d->rtaddr.sin6_len = sizeof(d->rtaddr);
2283 d->rtaddr.sin6_addr = dr->rtaddr;
2284 error = sa6_recoverscope(&d->rtaddr);
2287 d->flags = dr->flags;
2288 d->rtlifetime = dr->rtlifetime;
2289 d->expire = dr->expire;
2290 d->if_index = dr->ifp->if_index;
2292 panic("buffer too short");
2294 error = SYSCTL_OUT(req, buf, sizeof(*d));
2303 nd6_sysctl_prlist(SYSCTL_HANDLER_ARGS)
2306 char buf[1024] __aligned(4);
2307 struct in6_prefix *p, *pe;
2308 struct nd_prefix *pr;
2309 char ip6buf[INET6_ADDRSTRLEN];
2315 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
2318 struct sockaddr_in6 *sin6, *s6;
2319 struct nd_pfxrouter *pfr;
2321 p = (struct in6_prefix *)buf;
2322 pe = (struct in6_prefix *)(buf + sizeof(buf));
2325 bzero(p, sizeof(*p));
2326 sin6 = (struct sockaddr_in6 *)(p + 1);
2328 p->prefix = pr->ndpr_prefix;
2329 if (sa6_recoverscope(&p->prefix)) {
2331 "scope error in prefix list (%s)\n",
2332 ip6_sprintf(ip6buf, &p->prefix.sin6_addr));
2333 /* XXX: press on... */
2335 p->raflags = pr->ndpr_raf;
2336 p->prefixlen = pr->ndpr_plen;
2337 p->vltime = pr->ndpr_vltime;
2338 p->pltime = pr->ndpr_pltime;
2339 p->if_index = pr->ndpr_ifp->if_index;
2340 if (pr->ndpr_vltime == ND6_INFINITE_LIFETIME)
2345 /* XXX: we assume time_t is signed. */
2348 ((sizeof(maxexpire) * 8) - 1));
2349 if (pr->ndpr_vltime <
2350 maxexpire - pr->ndpr_lastupdate) {
2351 p->expire = pr->ndpr_lastupdate +
2354 p->expire = maxexpire;
2356 p->refcnt = pr->ndpr_refcnt;
2357 p->flags = pr->ndpr_stateflags;
2358 p->origin = PR_ORIG_RA;
2360 LIST_FOREACH(pfr, &pr->ndpr_advrtrs, pfr_entry) {
2361 if ((void *)&sin6[advrtrs + 1] > (void *)pe) {
2365 s6 = &sin6[advrtrs];
2366 bzero(s6, sizeof(*s6));
2367 s6->sin6_family = AF_INET6;
2368 s6->sin6_len = sizeof(*sin6);
2369 s6->sin6_addr = pfr->router->rtaddr;
2370 if (sa6_recoverscope(s6)) {
2373 "prefix list (%s)\n",
2375 &pfr->router->rtaddr));
2379 p->advrtrs = advrtrs;
2381 panic("buffer too short");
2383 advance = sizeof(*p) + sizeof(*sin6) * advrtrs;
2384 error = SYSCTL_OUT(req, buf, advance);