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"
37 #include "opt_kdtrace.h"
39 #include <sys/param.h>
40 #include <sys/systm.h>
41 #include <sys/callout.h>
42 #include <sys/malloc.h>
44 #include <sys/socket.h>
45 #include <sys/sockio.h>
47 #include <sys/kernel.h>
48 #include <sys/protosw.h>
49 #include <sys/errno.h>
50 #include <sys/syslog.h>
52 #include <sys/rwlock.h>
53 #include <sys/queue.h>
55 #include <sys/sysctl.h>
58 #include <net/if_arc.h>
59 #include <net/if_dl.h>
60 #include <net/if_types.h>
61 #include <net/iso88025.h>
63 #include <net/route.h>
66 #include <netinet/in.h>
67 #include <netinet/in_kdtrace.h>
68 #include <net/if_llatbl.h>
69 #define L3_ADDR_SIN6(le) ((struct sockaddr_in6 *) L3_ADDR(le))
70 #include <netinet/if_ether.h>
71 #include <netinet6/in6_var.h>
72 #include <netinet/ip6.h>
73 #include <netinet6/ip6_var.h>
74 #include <netinet6/scope6_var.h>
75 #include <netinet6/nd6.h>
76 #include <netinet6/in6_ifattach.h>
77 #include <netinet/icmp6.h>
78 #include <netinet6/send.h>
80 #include <sys/limits.h>
82 #include <security/mac/mac_framework.h>
84 #define ND6_SLOWTIMER_INTERVAL (60 * 60) /* 1 hour */
85 #define ND6_RECALC_REACHTM_INTERVAL (60 * 120) /* 2 hours */
87 #define SIN6(s) ((const struct sockaddr_in6 *)(s))
90 VNET_DEFINE(int, nd6_prune) = 1; /* walk list every 1 seconds */
91 VNET_DEFINE(int, nd6_delay) = 5; /* delay first probe time 5 second */
92 VNET_DEFINE(int, nd6_umaxtries) = 3; /* maximum unicast query */
93 VNET_DEFINE(int, nd6_mmaxtries) = 3; /* maximum multicast query */
94 VNET_DEFINE(int, nd6_useloopback) = 1; /* use loopback interface for
96 VNET_DEFINE(int, nd6_gctimer) = (60 * 60 * 24); /* 1 day: garbage
99 /* preventing too many loops in ND option parsing */
100 static VNET_DEFINE(int, nd6_maxndopt) = 10; /* max # of ND options allowed */
102 VNET_DEFINE(int, nd6_maxnudhint) = 0; /* max # of subsequent upper
104 static VNET_DEFINE(int, nd6_maxqueuelen) = 1; /* max pkts cached in unresolved
106 #define V_nd6_maxndopt VNET(nd6_maxndopt)
107 #define V_nd6_maxqueuelen VNET(nd6_maxqueuelen)
110 VNET_DEFINE(int, nd6_debug) = 1;
112 VNET_DEFINE(int, nd6_debug) = 0;
117 static int nd6_inuse, nd6_allocated;
120 VNET_DEFINE(struct nd_drhead, nd_defrouter);
121 VNET_DEFINE(struct nd_prhead, nd_prefix);
123 VNET_DEFINE(int, nd6_recalc_reachtm_interval) = ND6_RECALC_REACHTM_INTERVAL;
124 #define V_nd6_recalc_reachtm_interval VNET(nd6_recalc_reachtm_interval)
126 int (*send_sendso_input_hook)(struct mbuf *, struct ifnet *, int, int);
128 static int nd6_is_new_addr_neighbor(struct sockaddr_in6 *,
130 static void nd6_setmtu0(struct ifnet *, struct nd_ifinfo *);
131 static void nd6_slowtimo(void *);
132 static int regen_tmpaddr(struct in6_ifaddr *);
133 static struct llentry *nd6_free(struct llentry *, int);
134 static void nd6_llinfo_timer(void *);
135 static void clear_llinfo_pqueue(struct llentry *);
137 static VNET_DEFINE(struct callout, nd6_slowtimo_ch);
138 #define V_nd6_slowtimo_ch VNET(nd6_slowtimo_ch)
140 VNET_DEFINE(struct callout, nd6_timer_ch);
146 LIST_INIT(&V_nd_prefix);
148 /* initialization of the default router list */
149 TAILQ_INIT(&V_nd_defrouter);
152 callout_init(&V_nd6_slowtimo_ch, 0);
153 callout_reset(&V_nd6_slowtimo_ch, ND6_SLOWTIMER_INTERVAL * hz,
154 nd6_slowtimo, curvnet);
162 callout_drain(&V_nd6_slowtimo_ch);
163 callout_drain(&V_nd6_timer_ch);
168 nd6_ifattach(struct ifnet *ifp)
170 struct nd_ifinfo *nd;
172 nd = (struct nd_ifinfo *)malloc(sizeof(*nd), M_IP6NDP, M_WAITOK|M_ZERO);
175 nd->chlim = IPV6_DEFHLIM;
176 nd->basereachable = REACHABLE_TIME;
177 nd->reachable = ND_COMPUTE_RTIME(nd->basereachable);
178 nd->retrans = RETRANS_TIMER;
180 nd->flags = ND6_IFF_PERFORMNUD;
182 /* A loopback interface always has ND6_IFF_AUTO_LINKLOCAL.
183 * XXXHRS: Clear ND6_IFF_AUTO_LINKLOCAL on an IFT_BRIDGE interface by
184 * default regardless of the V_ip6_auto_linklocal configuration to
185 * give a reasonable default behavior.
187 if ((V_ip6_auto_linklocal && ifp->if_type != IFT_BRIDGE) ||
188 (ifp->if_flags & IFF_LOOPBACK))
189 nd->flags |= ND6_IFF_AUTO_LINKLOCAL;
191 * A loopback interface does not need to accept RTADV.
192 * XXXHRS: Clear ND6_IFF_ACCEPT_RTADV on an IFT_BRIDGE interface by
193 * default regardless of the V_ip6_accept_rtadv configuration to
194 * prevent the interface from accepting RA messages arrived
195 * on one of the member interfaces with ND6_IFF_ACCEPT_RTADV.
197 if (V_ip6_accept_rtadv &&
198 !(ifp->if_flags & IFF_LOOPBACK) &&
199 (ifp->if_type != IFT_BRIDGE))
200 nd->flags |= ND6_IFF_ACCEPT_RTADV;
201 if (V_ip6_no_radr && !(ifp->if_flags & IFF_LOOPBACK))
202 nd->flags |= ND6_IFF_NO_RADR;
204 /* XXX: we cannot call nd6_setmtu since ifp is not fully initialized */
205 nd6_setmtu0(ifp, nd);
211 nd6_ifdetach(struct nd_ifinfo *nd)
218 * Reset ND level link MTU. This function is called when the physical MTU
219 * changes, which means we might have to adjust the ND level MTU.
222 nd6_setmtu(struct ifnet *ifp)
225 nd6_setmtu0(ifp, ND_IFINFO(ifp));
228 /* XXX todo: do not maintain copy of ifp->if_mtu in ndi->maxmtu */
230 nd6_setmtu0(struct ifnet *ifp, struct nd_ifinfo *ndi)
234 omaxmtu = ndi->maxmtu;
236 switch (ifp->if_type) {
238 ndi->maxmtu = MIN(ARC_PHDS_MAXMTU, ifp->if_mtu); /* RFC2497 */
241 ndi->maxmtu = MIN(FDDIIPMTU, ifp->if_mtu); /* RFC2467 */
244 ndi->maxmtu = MIN(ISO88025_MAX_MTU, ifp->if_mtu);
247 ndi->maxmtu = ifp->if_mtu;
252 * Decreasing the interface MTU under IPV6 minimum MTU may cause
253 * undesirable situation. We thus notify the operator of the change
254 * explicitly. The check for omaxmtu is necessary to restrict the
255 * log to the case of changing the MTU, not initializing it.
257 if (omaxmtu >= IPV6_MMTU && ndi->maxmtu < IPV6_MMTU) {
258 log(LOG_NOTICE, "nd6_setmtu0: "
259 "new link MTU on %s (%lu) is too small for IPv6\n",
260 if_name(ifp), (unsigned long)ndi->maxmtu);
263 if (ndi->maxmtu > V_in6_maxmtu)
264 in6_setmaxmtu(); /* check all interfaces just in case */
269 nd6_option_init(void *opt, int icmp6len, union nd_opts *ndopts)
272 bzero(ndopts, sizeof(*ndopts));
273 ndopts->nd_opts_search = (struct nd_opt_hdr *)opt;
275 = (struct nd_opt_hdr *)(((u_char *)opt) + icmp6len);
278 ndopts->nd_opts_done = 1;
279 ndopts->nd_opts_search = NULL;
284 * Take one ND option.
287 nd6_option(union nd_opts *ndopts)
289 struct nd_opt_hdr *nd_opt;
292 KASSERT(ndopts != NULL, ("%s: ndopts == NULL", __func__));
293 KASSERT(ndopts->nd_opts_last != NULL, ("%s: uninitialized ndopts",
295 if (ndopts->nd_opts_search == NULL)
297 if (ndopts->nd_opts_done)
300 nd_opt = ndopts->nd_opts_search;
302 /* make sure nd_opt_len is inside the buffer */
303 if ((caddr_t)&nd_opt->nd_opt_len >= (caddr_t)ndopts->nd_opts_last) {
304 bzero(ndopts, sizeof(*ndopts));
308 olen = nd_opt->nd_opt_len << 3;
311 * Message validation requires that all included
312 * options have a length that is greater than zero.
314 bzero(ndopts, sizeof(*ndopts));
318 ndopts->nd_opts_search = (struct nd_opt_hdr *)((caddr_t)nd_opt + olen);
319 if (ndopts->nd_opts_search > ndopts->nd_opts_last) {
320 /* option overruns the end of buffer, invalid */
321 bzero(ndopts, sizeof(*ndopts));
323 } else if (ndopts->nd_opts_search == ndopts->nd_opts_last) {
324 /* reached the end of options chain */
325 ndopts->nd_opts_done = 1;
326 ndopts->nd_opts_search = NULL;
332 * Parse multiple ND options.
333 * This function is much easier to use, for ND routines that do not need
334 * multiple options of the same type.
337 nd6_options(union nd_opts *ndopts)
339 struct nd_opt_hdr *nd_opt;
342 KASSERT(ndopts != NULL, ("%s: ndopts == NULL", __func__));
343 KASSERT(ndopts->nd_opts_last != NULL, ("%s: uninitialized ndopts",
345 if (ndopts->nd_opts_search == NULL)
349 nd_opt = nd6_option(ndopts);
350 if (nd_opt == NULL && ndopts->nd_opts_last == NULL) {
352 * Message validation requires that all included
353 * options have a length that is greater than zero.
355 ICMP6STAT_INC(icp6s_nd_badopt);
356 bzero(ndopts, sizeof(*ndopts));
363 switch (nd_opt->nd_opt_type) {
364 case ND_OPT_SOURCE_LINKADDR:
365 case ND_OPT_TARGET_LINKADDR:
367 case ND_OPT_REDIRECTED_HEADER:
368 if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) {
370 "duplicated ND6 option found (type=%d)\n",
371 nd_opt->nd_opt_type));
374 ndopts->nd_opt_array[nd_opt->nd_opt_type]
378 case ND_OPT_PREFIX_INFORMATION:
379 if (ndopts->nd_opt_array[nd_opt->nd_opt_type] == 0) {
380 ndopts->nd_opt_array[nd_opt->nd_opt_type]
383 ndopts->nd_opts_pi_end =
384 (struct nd_opt_prefix_info *)nd_opt;
386 /* What about ND_OPT_ROUTE_INFO? RFC 4191 */
387 case ND_OPT_RDNSS: /* RFC 6106 */
388 case ND_OPT_DNSSL: /* RFC 6106 */
390 * Silently ignore options we know and do not care about
396 * Unknown options must be silently ignored,
397 * to accomodate future extension to the protocol.
400 "nd6_options: unsupported option %d - "
401 "option ignored\n", nd_opt->nd_opt_type));
406 if (i > V_nd6_maxndopt) {
407 ICMP6STAT_INC(icp6s_nd_toomanyopt);
408 nd6log((LOG_INFO, "too many loop in nd opt\n"));
412 if (ndopts->nd_opts_done)
420 * ND6 timer routine to handle ND6 entries
423 nd6_llinfo_settimer_locked(struct llentry *ln, long tick)
427 LLE_WLOCK_ASSERT(ln);
432 canceled = callout_stop(&ln->ln_timer_ch);
434 ln->la_expire = time_uptime + tick / hz;
436 if (tick > INT_MAX) {
437 ln->ln_ntick = tick - INT_MAX;
438 canceled = callout_reset(&ln->ln_timer_ch, INT_MAX,
439 nd6_llinfo_timer, ln);
442 canceled = callout_reset(&ln->ln_timer_ch, tick,
443 nd6_llinfo_timer, ln);
451 nd6_llinfo_settimer(struct llentry *ln, long tick)
455 nd6_llinfo_settimer_locked(ln, tick);
460 nd6_llinfo_timer(void *arg)
463 struct in6_addr *dst;
465 struct nd_ifinfo *ndi = NULL;
467 KASSERT(arg != NULL, ("%s: arg NULL", __func__));
468 ln = (struct llentry *)arg;
469 LLE_WLOCK_ASSERT(ln);
470 ifp = ln->lle_tbl->llt_ifp;
472 CURVNET_SET(ifp->if_vnet);
474 if (ln->ln_ntick > 0) {
475 if (ln->ln_ntick > INT_MAX) {
476 ln->ln_ntick -= INT_MAX;
477 nd6_llinfo_settimer_locked(ln, INT_MAX);
480 nd6_llinfo_settimer_locked(ln, ln->ln_ntick);
485 ndi = ND_IFINFO(ifp);
486 dst = &L3_ADDR_SIN6(ln)->sin6_addr;
487 if (ln->la_flags & LLE_STATIC) {
491 if (ln->la_flags & LLE_DELETED) {
492 (void)nd6_free(ln, 0);
497 switch (ln->ln_state) {
498 case ND6_LLINFO_INCOMPLETE:
499 if (ln->la_asked < V_nd6_mmaxtries) {
501 nd6_llinfo_settimer_locked(ln, (long)ndi->retrans * hz / 1000);
503 nd6_ns_output(ifp, NULL, dst, ln, 0);
506 struct mbuf *m = ln->la_hold;
511 * assuming every packet in la_hold has the
512 * same IP header. Send error after unlock.
517 clear_llinfo_pqueue(ln);
519 EVENTHANDLER_INVOKE(lle_event, ln, LLENTRY_TIMEDOUT);
520 (void)nd6_free(ln, 0);
523 icmp6_error2(m, ICMP6_DST_UNREACH,
524 ICMP6_DST_UNREACH_ADDR, 0, ifp);
527 case ND6_LLINFO_REACHABLE:
528 if (!ND6_LLINFO_PERMANENT(ln)) {
529 ln->ln_state = ND6_LLINFO_STALE;
530 nd6_llinfo_settimer_locked(ln, (long)V_nd6_gctimer * hz);
534 case ND6_LLINFO_STALE:
535 /* Garbage Collection(RFC 2461 5.3) */
536 if (!ND6_LLINFO_PERMANENT(ln)) {
537 EVENTHANDLER_INVOKE(lle_event, ln, LLENTRY_EXPIRED);
538 (void)nd6_free(ln, 1);
543 case ND6_LLINFO_DELAY:
544 if (ndi && (ndi->flags & ND6_IFF_PERFORMNUD) != 0) {
547 ln->ln_state = ND6_LLINFO_PROBE;
548 nd6_llinfo_settimer_locked(ln, (long)ndi->retrans * hz / 1000);
550 nd6_ns_output(ifp, dst, dst, ln, 0);
553 ln->ln_state = ND6_LLINFO_STALE; /* XXX */
554 nd6_llinfo_settimer_locked(ln, (long)V_nd6_gctimer * hz);
557 case ND6_LLINFO_PROBE:
558 if (ln->la_asked < V_nd6_umaxtries) {
560 nd6_llinfo_settimer_locked(ln, (long)ndi->retrans * hz / 1000);
562 nd6_ns_output(ifp, dst, dst, ln, 0);
565 EVENTHANDLER_INVOKE(lle_event, ln, LLENTRY_EXPIRED);
566 (void)nd6_free(ln, 0);
571 panic("%s: paths in a dark night can be confusing: %d",
572 __func__, ln->ln_state);
582 * ND6 timer routine to expire default route list and prefix list
587 CURVNET_SET((struct vnet *) arg);
588 struct nd_defrouter *dr, *ndr;
589 struct nd_prefix *pr, *npr;
590 struct in6_ifaddr *ia6, *nia6;
592 callout_reset(&V_nd6_timer_ch, V_nd6_prune * hz,
595 /* expire default router list */
596 TAILQ_FOREACH_SAFE(dr, &V_nd_defrouter, dr_entry, ndr) {
597 if (dr->expire && dr->expire < time_uptime)
602 * expire interface addresses.
603 * in the past the loop was inside prefix expiry processing.
604 * However, from a stricter speci-confrmance standpoint, we should
605 * rather separate address lifetimes and prefix lifetimes.
607 * XXXRW: in6_ifaddrhead locking.
610 TAILQ_FOREACH_SAFE(ia6, &V_in6_ifaddrhead, ia_link, nia6) {
611 /* check address lifetime */
612 if (IFA6_IS_INVALID(ia6)) {
616 * If the expiring address is temporary, try
617 * regenerating a new one. This would be useful when
618 * we suspended a laptop PC, then turned it on after a
619 * period that could invalidate all temporary
620 * addresses. Although we may have to restart the
621 * loop (see below), it must be after purging the
622 * address. Otherwise, we'd see an infinite loop of
625 if (V_ip6_use_tempaddr &&
626 (ia6->ia6_flags & IN6_IFF_TEMPORARY) != 0) {
627 if (regen_tmpaddr(ia6) == 0)
631 in6_purgeaddr(&ia6->ia_ifa);
634 goto addrloop; /* XXX: see below */
635 } else if (IFA6_IS_DEPRECATED(ia6)) {
636 int oldflags = ia6->ia6_flags;
638 ia6->ia6_flags |= IN6_IFF_DEPRECATED;
641 * If a temporary address has just become deprecated,
642 * regenerate a new one if possible.
644 if (V_ip6_use_tempaddr &&
645 (ia6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
646 (oldflags & IN6_IFF_DEPRECATED) == 0) {
648 if (regen_tmpaddr(ia6) == 0) {
650 * A new temporary address is
652 * XXX: this means the address chain
653 * has changed while we are still in
654 * the loop. Although the change
655 * would not cause disaster (because
656 * it's not a deletion, but an
657 * addition,) we'd rather restart the
658 * loop just for safety. Or does this
659 * significantly reduce performance??
666 * A new RA might have made a deprecated address
669 ia6->ia6_flags &= ~IN6_IFF_DEPRECATED;
673 /* expire prefix list */
674 LIST_FOREACH_SAFE(pr, &V_nd_prefix, ndpr_entry, npr) {
676 * check prefix lifetime.
677 * since pltime is just for autoconf, pltime processing for
678 * prefix is not necessary.
680 if (pr->ndpr_vltime != ND6_INFINITE_LIFETIME &&
681 time_uptime - pr->ndpr_lastupdate > pr->ndpr_vltime) {
684 * address expiration and prefix expiration are
685 * separate. NEVER perform in6_purgeaddr here.
694 * ia6 - deprecated/invalidated temporary address
697 regen_tmpaddr(struct in6_ifaddr *ia6)
701 struct in6_ifaddr *public_ifa6 = NULL;
703 ifp = ia6->ia_ifa.ifa_ifp;
705 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
706 struct in6_ifaddr *it6;
708 if (ifa->ifa_addr->sa_family != AF_INET6)
711 it6 = (struct in6_ifaddr *)ifa;
713 /* ignore no autoconf addresses. */
714 if ((it6->ia6_flags & IN6_IFF_AUTOCONF) == 0)
717 /* ignore autoconf addresses with different prefixes. */
718 if (it6->ia6_ndpr == NULL || it6->ia6_ndpr != ia6->ia6_ndpr)
722 * Now we are looking at an autoconf address with the same
723 * prefix as ours. If the address is temporary and is still
724 * preferred, do not create another one. It would be rare, but
725 * could happen, for example, when we resume a laptop PC after
728 if ((it6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
729 !IFA6_IS_DEPRECATED(it6)) {
735 * This is a public autoconf address that has the same prefix
736 * as ours. If it is preferred, keep it. We can't break the
737 * loop here, because there may be a still-preferred temporary
738 * address with the prefix.
740 if (!IFA6_IS_DEPRECATED(it6))
743 if (public_ifa6 != NULL)
744 ifa_ref(&public_ifa6->ia_ifa);
746 IF_ADDR_RUNLOCK(ifp);
748 if (public_ifa6 != NULL) {
751 if ((e = in6_tmpifadd(public_ifa6, 0, 0)) != 0) {
752 ifa_free(&public_ifa6->ia_ifa);
753 log(LOG_NOTICE, "regen_tmpaddr: failed to create a new"
754 " tmp addr,errno=%d\n", e);
757 ifa_free(&public_ifa6->ia_ifa);
765 * Nuke neighbor cache/prefix/default router management table, right before
769 nd6_purge(struct ifnet *ifp)
771 struct nd_defrouter *dr, *ndr;
772 struct nd_prefix *pr, *npr;
775 * Nuke default router list entries toward ifp.
776 * We defer removal of default router list entries that is installed
777 * in the routing table, in order to keep additional side effects as
780 TAILQ_FOREACH_SAFE(dr, &V_nd_defrouter, dr_entry, ndr) {
788 TAILQ_FOREACH_SAFE(dr, &V_nd_defrouter, dr_entry, ndr) {
796 /* Nuke prefix list entries toward ifp */
797 LIST_FOREACH_SAFE(pr, &V_nd_prefix, ndpr_entry, npr) {
798 if (pr->ndpr_ifp == ifp) {
800 * Because if_detach() does *not* release prefixes
801 * while purging addresses the reference count will
802 * still be above zero. We therefore reset it to
803 * make sure that the prefix really gets purged.
808 * Previously, pr->ndpr_addr is removed as well,
809 * but I strongly believe we don't have to do it.
810 * nd6_purge() is only called from in6_ifdetach(),
811 * which removes all the associated interface addresses
813 * (jinmei@kame.net 20010129)
819 /* cancel default outgoing interface setting */
820 if (V_nd6_defifindex == ifp->if_index)
821 nd6_setdefaultiface(0);
823 if (ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV) {
824 /* Refresh default router list. */
829 * We do not nuke the neighbor cache entries here any more
830 * because the neighbor cache is kept in if_afdata[AF_INET6].
831 * nd6_purge() is invoked by in6_ifdetach() which is called
832 * from if_detach() where everything gets purged. So let
833 * in6_domifdetach() do the actual L2 table purging work.
838 * the caller acquires and releases the lock on the lltbls
839 * Returns the llentry locked
842 nd6_lookup(struct in6_addr *addr6, int flags, struct ifnet *ifp)
844 struct sockaddr_in6 sin6;
848 bzero(&sin6, sizeof(sin6));
849 sin6.sin6_len = sizeof(struct sockaddr_in6);
850 sin6.sin6_family = AF_INET6;
851 sin6.sin6_addr = *addr6;
853 IF_AFDATA_LOCK_ASSERT(ifp);
856 if (flags & ND6_CREATE)
857 llflags |= LLE_CREATE;
858 if (flags & ND6_EXCLUSIVE)
859 llflags |= LLE_EXCLUSIVE;
861 ln = lla_lookup(LLTABLE6(ifp), llflags, (struct sockaddr *)&sin6);
862 if ((ln != NULL) && (llflags & LLE_CREATE))
863 ln->ln_state = ND6_LLINFO_NOSTATE;
869 * Test whether a given IPv6 address is a neighbor or not, ignoring
870 * the actual neighbor cache. The neighbor cache is ignored in order
871 * to not reenter the routing code from within itself.
874 nd6_is_new_addr_neighbor(struct sockaddr_in6 *addr, struct ifnet *ifp)
876 struct nd_prefix *pr;
877 struct ifaddr *dstaddr;
880 * A link-local address is always a neighbor.
881 * XXX: a link does not necessarily specify a single interface.
883 if (IN6_IS_ADDR_LINKLOCAL(&addr->sin6_addr)) {
884 struct sockaddr_in6 sin6_copy;
888 * We need sin6_copy since sa6_recoverscope() may modify the
892 if (sa6_recoverscope(&sin6_copy))
893 return (0); /* XXX: should be impossible */
894 if (in6_setscope(&sin6_copy.sin6_addr, ifp, &zone))
896 if (sin6_copy.sin6_scope_id == zone)
903 * If the address matches one of our addresses,
904 * it should be a neighbor.
905 * If the address matches one of our on-link prefixes, it should be a
908 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
909 if (pr->ndpr_ifp != ifp)
912 if (!(pr->ndpr_stateflags & NDPRF_ONLINK)) {
915 /* Always use the default FIB here. */
916 rt = in6_rtalloc1((struct sockaddr *)&pr->ndpr_prefix,
917 0, 0, RT_DEFAULT_FIB);
921 * This is the case where multiple interfaces
922 * have the same prefix, but only one is installed
923 * into the routing table and that prefix entry
924 * is not the one being examined here. In the case
925 * where RADIX_MPATH is enabled, multiple route
926 * entries (of the same rt_key value) will be
927 * installed because the interface addresses all
930 if (!IN6_ARE_ADDR_EQUAL(&pr->ndpr_prefix.sin6_addr,
931 &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr)) {
938 if (IN6_ARE_MASKED_ADDR_EQUAL(&pr->ndpr_prefix.sin6_addr,
939 &addr->sin6_addr, &pr->ndpr_mask))
944 * If the address is assigned on the node of the other side of
945 * a p2p interface, the address should be a neighbor.
947 dstaddr = ifa_ifwithdstaddr((struct sockaddr *)addr);
948 if (dstaddr != NULL) {
949 if (dstaddr->ifa_ifp == ifp) {
957 * If the default router list is empty, all addresses are regarded
958 * as on-link, and thus, as a neighbor.
960 if (ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV &&
961 TAILQ_EMPTY(&V_nd_defrouter) &&
962 V_nd6_defifindex == ifp->if_index) {
971 * Detect if a given IPv6 address identifies a neighbor on a given link.
972 * XXX: should take care of the destination of a p2p link?
975 nd6_is_addr_neighbor(struct sockaddr_in6 *addr, struct ifnet *ifp)
980 IF_AFDATA_UNLOCK_ASSERT(ifp);
981 if (nd6_is_new_addr_neighbor(addr, ifp))
985 * Even if the address matches none of our addresses, it might be
986 * in the neighbor cache.
988 IF_AFDATA_RLOCK(ifp);
989 if ((lle = nd6_lookup(&addr->sin6_addr, 0, ifp)) != NULL) {
993 IF_AFDATA_RUNLOCK(ifp);
998 * Free an nd6 llinfo entry.
999 * Since the function would cause significant changes in the kernel, DO NOT
1000 * make it global, unless you have a strong reason for the change, and are sure
1001 * that the change is safe.
1003 static struct llentry *
1004 nd6_free(struct llentry *ln, int gc)
1006 struct llentry *next;
1007 struct nd_defrouter *dr;
1010 LLE_WLOCK_ASSERT(ln);
1013 * we used to have pfctlinput(PRC_HOSTDEAD) here.
1014 * even though it is not harmful, it was not really necessary.
1018 nd6_llinfo_settimer_locked(ln, -1);
1020 ifp = ln->lle_tbl->llt_ifp;
1022 if (ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV) {
1023 dr = defrouter_lookup(&L3_ADDR_SIN6(ln)->sin6_addr, ifp);
1025 if (dr != NULL && dr->expire &&
1026 ln->ln_state == ND6_LLINFO_STALE && gc) {
1028 * If the reason for the deletion is just garbage
1029 * collection, and the neighbor is an active default
1030 * router, do not delete it. Instead, reset the GC
1031 * timer using the router's lifetime.
1032 * Simply deleting the entry would affect default
1033 * router selection, which is not necessarily a good
1034 * thing, especially when we're using router preference
1036 * XXX: the check for ln_state would be redundant,
1037 * but we intentionally keep it just in case.
1039 if (dr->expire > time_uptime)
1040 nd6_llinfo_settimer_locked(ln,
1041 (dr->expire - time_uptime) * hz);
1043 nd6_llinfo_settimer_locked(ln,
1044 (long)V_nd6_gctimer * hz);
1046 next = LIST_NEXT(ln, lle_next);
1054 * Unreachablity of a router might affect the default
1055 * router selection and on-link detection of advertised
1060 * Temporarily fake the state to choose a new default
1061 * router and to perform on-link determination of
1062 * prefixes correctly.
1063 * Below the state will be set correctly,
1064 * or the entry itself will be deleted.
1066 ln->ln_state = ND6_LLINFO_INCOMPLETE;
1069 if (ln->ln_router || dr) {
1072 * We need to unlock to avoid a LOR with rt6_flush() with the
1073 * rnh and for the calls to pfxlist_onlink_check() and
1074 * defrouter_select() in the block further down for calls
1075 * into nd6_lookup(). We still hold a ref.
1080 * rt6_flush must be called whether or not the neighbor
1081 * is in the Default Router List.
1082 * See a corresponding comment in nd6_na_input().
1084 rt6_flush(&L3_ADDR_SIN6(ln)->sin6_addr, ifp);
1089 * Since defrouter_select() does not affect the
1090 * on-link determination and MIP6 needs the check
1091 * before the default router selection, we perform
1094 pfxlist_onlink_check();
1097 * Refresh default router list.
1102 if (ln->ln_router || dr)
1107 * Before deleting the entry, remember the next entry as the
1108 * return value. We need this because pfxlist_onlink_check() above
1109 * might have freed other entries (particularly the old next entry) as
1110 * a side effect (XXX).
1112 next = LIST_NEXT(ln, lle_next);
1115 * Save to unlock. We still hold an extra reference and will not
1116 * free(9) in llentry_free() if someone else holds one as well.
1119 IF_AFDATA_LOCK(ifp);
1122 /* Guard against race with other llentry_free(). */
1123 if (ln->la_flags & LLE_LINKED) {
1127 LLE_FREE_LOCKED(ln);
1129 IF_AFDATA_UNLOCK(ifp);
1135 * Upper-layer reachability hint for Neighbor Unreachability Detection.
1137 * XXX cost-effective methods?
1140 nd6_nud_hint(struct rtentry *rt, struct in6_addr *dst6, int force)
1145 if ((dst6 == NULL) || (rt == NULL))
1149 IF_AFDATA_LOCK(ifp);
1150 ln = nd6_lookup(dst6, ND6_EXCLUSIVE, NULL);
1151 IF_AFDATA_UNLOCK(ifp);
1155 if (ln->ln_state < ND6_LLINFO_REACHABLE)
1159 * if we get upper-layer reachability confirmation many times,
1160 * it is possible we have false information.
1164 if (ln->ln_byhint > V_nd6_maxnudhint) {
1169 ln->ln_state = ND6_LLINFO_REACHABLE;
1170 if (!ND6_LLINFO_PERMANENT(ln)) {
1171 nd6_llinfo_settimer_locked(ln,
1172 (long)ND_IFINFO(rt->rt_ifp)->reachable * hz);
1180 * Rejuvenate this function for routing operations related
1184 nd6_rtrequest(int req, struct rtentry *rt, struct rt_addrinfo *info)
1186 struct sockaddr_in6 *gateway;
1187 struct nd_defrouter *dr;
1191 gateway = (struct sockaddr_in6 *)rt->rt_gateway;
1202 * Only indirect routes are interesting.
1204 if ((rt->rt_flags & RTF_GATEWAY) == 0)
1207 * check for default route
1209 if (IN6_ARE_ADDR_EQUAL(&in6addr_any,
1210 &SIN6(rt_key(rt))->sin6_addr)) {
1212 dr = defrouter_lookup(&gateway->sin6_addr, ifp);
1222 nd6_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp)
1224 struct in6_drlist *drl = (struct in6_drlist *)data;
1225 struct in6_oprlist *oprl = (struct in6_oprlist *)data;
1226 struct in6_ndireq *ndi = (struct in6_ndireq *)data;
1227 struct in6_nbrinfo *nbi = (struct in6_nbrinfo *)data;
1228 struct in6_ndifreq *ndif = (struct in6_ndifreq *)data;
1229 struct nd_defrouter *dr;
1230 struct nd_prefix *pr;
1231 int i = 0, error = 0;
1233 if (ifp->if_afdata[AF_INET6] == NULL)
1234 return (EPFNOSUPPORT);
1236 case SIOCGDRLST_IN6:
1238 * obsolete API, use sysctl under net.inet6.icmp6
1240 bzero(drl, sizeof(*drl));
1241 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) {
1244 drl->defrouter[i].rtaddr = dr->rtaddr;
1245 in6_clearscope(&drl->defrouter[i].rtaddr);
1247 drl->defrouter[i].flags = dr->flags;
1248 drl->defrouter[i].rtlifetime = dr->rtlifetime;
1249 drl->defrouter[i].expire = dr->expire +
1250 (time_second - time_uptime);
1251 drl->defrouter[i].if_index = dr->ifp->if_index;
1255 case SIOCGPRLST_IN6:
1257 * obsolete API, use sysctl under net.inet6.icmp6
1259 * XXX the structure in6_prlist was changed in backward-
1260 * incompatible manner. in6_oprlist is used for SIOCGPRLST_IN6,
1261 * in6_prlist is used for nd6_sysctl() - fill_prlist().
1264 * XXX meaning of fields, especialy "raflags", is very
1265 * differnet between RA prefix list and RR/static prefix list.
1266 * how about separating ioctls into two?
1268 bzero(oprl, sizeof(*oprl));
1269 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
1270 struct nd_pfxrouter *pfr;
1275 oprl->prefix[i].prefix = pr->ndpr_prefix.sin6_addr;
1276 oprl->prefix[i].raflags = pr->ndpr_raf;
1277 oprl->prefix[i].prefixlen = pr->ndpr_plen;
1278 oprl->prefix[i].vltime = pr->ndpr_vltime;
1279 oprl->prefix[i].pltime = pr->ndpr_pltime;
1280 oprl->prefix[i].if_index = pr->ndpr_ifp->if_index;
1281 if (pr->ndpr_vltime == ND6_INFINITE_LIFETIME)
1282 oprl->prefix[i].expire = 0;
1286 /* XXX: we assume time_t is signed. */
1289 ((sizeof(maxexpire) * 8) - 1));
1290 if (pr->ndpr_vltime <
1291 maxexpire - pr->ndpr_lastupdate) {
1292 oprl->prefix[i].expire =
1293 pr->ndpr_lastupdate +
1295 (time_second - time_uptime);
1297 oprl->prefix[i].expire = maxexpire;
1301 LIST_FOREACH(pfr, &pr->ndpr_advrtrs, pfr_entry) {
1303 #define RTRADDR oprl->prefix[i].advrtr[j]
1304 RTRADDR = pfr->router->rtaddr;
1305 in6_clearscope(&RTRADDR);
1310 oprl->prefix[i].advrtrs = j;
1311 oprl->prefix[i].origin = PR_ORIG_RA;
1317 case OSIOCGIFINFO_IN6:
1319 /* XXX: old ndp(8) assumes a positive value for linkmtu. */
1320 bzero(&ND, sizeof(ND));
1321 ND.linkmtu = IN6_LINKMTU(ifp);
1322 ND.maxmtu = ND_IFINFO(ifp)->maxmtu;
1323 ND.basereachable = ND_IFINFO(ifp)->basereachable;
1324 ND.reachable = ND_IFINFO(ifp)->reachable;
1325 ND.retrans = ND_IFINFO(ifp)->retrans;
1326 ND.flags = ND_IFINFO(ifp)->flags;
1327 ND.recalctm = ND_IFINFO(ifp)->recalctm;
1328 ND.chlim = ND_IFINFO(ifp)->chlim;
1330 case SIOCGIFINFO_IN6:
1331 ND = *ND_IFINFO(ifp);
1333 case SIOCSIFINFO_IN6:
1335 * used to change host variables from userland.
1336 * intented for a use on router to reflect RA configurations.
1338 /* 0 means 'unspecified' */
1339 if (ND.linkmtu != 0) {
1340 if (ND.linkmtu < IPV6_MMTU ||
1341 ND.linkmtu > IN6_LINKMTU(ifp)) {
1345 ND_IFINFO(ifp)->linkmtu = ND.linkmtu;
1348 if (ND.basereachable != 0) {
1349 int obasereachable = ND_IFINFO(ifp)->basereachable;
1351 ND_IFINFO(ifp)->basereachable = ND.basereachable;
1352 if (ND.basereachable != obasereachable)
1353 ND_IFINFO(ifp)->reachable =
1354 ND_COMPUTE_RTIME(ND.basereachable);
1356 if (ND.retrans != 0)
1357 ND_IFINFO(ifp)->retrans = ND.retrans;
1359 ND_IFINFO(ifp)->chlim = ND.chlim;
1361 case SIOCSIFINFO_FLAGS:
1364 struct in6_ifaddr *ia;
1366 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) &&
1367 !(ND.flags & ND6_IFF_IFDISABLED)) {
1368 /* ifdisabled 1->0 transision */
1371 * If the interface is marked as ND6_IFF_IFDISABLED and
1372 * has an link-local address with IN6_IFF_DUPLICATED,
1373 * do not clear ND6_IFF_IFDISABLED.
1374 * See RFC 4862, Section 5.4.5.
1376 int duplicated_linklocal = 0;
1379 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1380 if (ifa->ifa_addr->sa_family != AF_INET6)
1382 ia = (struct in6_ifaddr *)ifa;
1383 if ((ia->ia6_flags & IN6_IFF_DUPLICATED) &&
1384 IN6_IS_ADDR_LINKLOCAL(IA6_IN6(ia))) {
1385 duplicated_linklocal = 1;
1389 IF_ADDR_RUNLOCK(ifp);
1391 if (duplicated_linklocal) {
1392 ND.flags |= ND6_IFF_IFDISABLED;
1393 log(LOG_ERR, "Cannot enable an interface"
1394 " with a link-local address marked"
1397 ND_IFINFO(ifp)->flags &= ~ND6_IFF_IFDISABLED;
1398 if (ifp->if_flags & IFF_UP)
1401 } else if (!(ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) &&
1402 (ND.flags & ND6_IFF_IFDISABLED)) {
1403 /* ifdisabled 0->1 transision */
1404 /* Mark all IPv6 address as tentative. */
1406 ND_IFINFO(ifp)->flags |= ND6_IFF_IFDISABLED;
1408 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1409 if (ifa->ifa_addr->sa_family != AF_INET6)
1411 ia = (struct in6_ifaddr *)ifa;
1412 ia->ia6_flags |= IN6_IFF_TENTATIVE;
1414 IF_ADDR_RUNLOCK(ifp);
1417 if (ND.flags & ND6_IFF_AUTO_LINKLOCAL) {
1418 if (!(ND_IFINFO(ifp)->flags & ND6_IFF_AUTO_LINKLOCAL)) {
1419 /* auto_linklocal 0->1 transision */
1421 /* If no link-local address on ifp, configure */
1422 ND_IFINFO(ifp)->flags |= ND6_IFF_AUTO_LINKLOCAL;
1423 in6_ifattach(ifp, NULL);
1424 } else if (!(ND.flags & ND6_IFF_IFDISABLED) &&
1425 ifp->if_flags & IFF_UP) {
1427 * When the IF already has
1428 * ND6_IFF_AUTO_LINKLOCAL, no link-local
1429 * address is assigned, and IFF_UP, try to
1432 int haslinklocal = 0;
1435 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1436 if (ifa->ifa_addr->sa_family != AF_INET6)
1438 ia = (struct in6_ifaddr *)ifa;
1439 if (IN6_IS_ADDR_LINKLOCAL(IA6_IN6(ia))) {
1444 IF_ADDR_RUNLOCK(ifp);
1446 in6_ifattach(ifp, NULL);
1450 ND_IFINFO(ifp)->flags = ND.flags;
1453 case SIOCSNDFLUSH_IN6: /* XXX: the ioctl name is confusing... */
1454 /* sync kernel routing table with the default router list */
1458 case SIOCSPFXFLUSH_IN6:
1460 /* flush all the prefix advertised by routers */
1461 struct nd_prefix *pr, *next;
1463 LIST_FOREACH_SAFE(pr, &V_nd_prefix, ndpr_entry, next) {
1464 struct in6_ifaddr *ia, *ia_next;
1466 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
1469 /* do we really have to remove addresses as well? */
1470 /* XXXRW: in6_ifaddrhead locking. */
1471 TAILQ_FOREACH_SAFE(ia, &V_in6_ifaddrhead, ia_link,
1473 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) == 0)
1476 if (ia->ia6_ndpr == pr)
1477 in6_purgeaddr(&ia->ia_ifa);
1483 case SIOCSRTRFLUSH_IN6:
1485 /* flush all the default routers */
1486 struct nd_defrouter *dr, *next;
1489 TAILQ_FOREACH_SAFE(dr, &V_nd_defrouter, dr_entry, next) {
1495 case SIOCGNBRINFO_IN6:
1498 struct in6_addr nb_addr = nbi->addr; /* make local for safety */
1500 if ((error = in6_setscope(&nb_addr, ifp, NULL)) != 0)
1503 IF_AFDATA_RLOCK(ifp);
1504 ln = nd6_lookup(&nb_addr, 0, ifp);
1505 IF_AFDATA_RUNLOCK(ifp);
1511 nbi->state = ln->ln_state;
1512 nbi->asked = ln->la_asked;
1513 nbi->isrouter = ln->ln_router;
1514 if (ln->la_expire == 0)
1517 nbi->expire = ln->la_expire +
1518 (time_second - time_uptime);
1522 case SIOCGDEFIFACE_IN6: /* XXX: should be implemented as a sysctl? */
1523 ndif->ifindex = V_nd6_defifindex;
1525 case SIOCSDEFIFACE_IN6: /* XXX: should be implemented as a sysctl? */
1526 return (nd6_setdefaultiface(ndif->ifindex));
1532 * Create neighbor cache entry and cache link-layer address,
1533 * on reception of inbound ND6 packets. (RS/RA/NS/redirect)
1536 * code - type dependent information
1539 * The caller of this function already acquired the ndp
1540 * cache table lock because the cache entry is returned.
1543 nd6_cache_lladdr(struct ifnet *ifp, struct in6_addr *from, char *lladdr,
1544 int lladdrlen, int type, int code)
1546 struct llentry *ln = NULL;
1553 uint16_t router = 0;
1554 struct sockaddr_in6 sin6;
1555 struct mbuf *chain = NULL;
1556 int static_route = 0;
1558 IF_AFDATA_UNLOCK_ASSERT(ifp);
1560 KASSERT(ifp != NULL, ("%s: ifp == NULL", __func__));
1561 KASSERT(from != NULL, ("%s: from == NULL", __func__));
1563 /* nothing must be updated for unspecified address */
1564 if (IN6_IS_ADDR_UNSPECIFIED(from))
1568 * Validation about ifp->if_addrlen and lladdrlen must be done in
1571 * XXX If the link does not have link-layer adderss, what should
1572 * we do? (ifp->if_addrlen == 0)
1573 * Spec says nothing in sections for RA, RS and NA. There's small
1574 * description on it in NS section (RFC 2461 7.2.3).
1576 flags = lladdr ? ND6_EXCLUSIVE : 0;
1577 IF_AFDATA_LOCK(ifp);
1578 ln = nd6_lookup(from, flags, ifp);
1581 flags |= ND6_EXCLUSIVE;
1582 ln = nd6_lookup(from, flags | ND6_CREATE, ifp);
1583 IF_AFDATA_UNLOCK(ifp);
1586 IF_AFDATA_UNLOCK(ifp);
1587 /* do nothing if static ndp is set */
1588 if (ln->la_flags & LLE_STATIC) {
1597 olladdr = (ln->la_flags & LLE_VALID) ? 1 : 0;
1598 if (olladdr && lladdr) {
1599 llchange = bcmp(lladdr, &ln->ll_addr,
1605 * newentry olladdr lladdr llchange (*=record)
1608 * 0 n y -- (3) * STALE
1610 * 0 y y y (5) * STALE
1611 * 1 -- n -- (6) NOSTATE(= PASSIVE)
1612 * 1 -- y -- (7) * STALE
1615 if (lladdr) { /* (3-5) and (7) */
1617 * Record source link-layer address
1618 * XXX is it dependent to ifp->if_type?
1620 bcopy(lladdr, &ln->ll_addr, ifp->if_addrlen);
1621 ln->la_flags |= LLE_VALID;
1622 EVENTHANDLER_INVOKE(lle_event, ln, LLENTRY_RESOLVED);
1626 if ((!olladdr && lladdr != NULL) || /* (3) */
1627 (olladdr && lladdr != NULL && llchange)) { /* (5) */
1629 newstate = ND6_LLINFO_STALE;
1630 } else /* (1-2,4) */
1634 if (lladdr == NULL) /* (6) */
1635 newstate = ND6_LLINFO_NOSTATE;
1637 newstate = ND6_LLINFO_STALE;
1642 * Update the state of the neighbor cache.
1644 ln->ln_state = newstate;
1646 if (ln->ln_state == ND6_LLINFO_STALE) {
1648 * XXX: since nd6_output() below will cause
1649 * state tansition to DELAY and reset the timer,
1650 * we must set the timer now, although it is actually
1653 nd6_llinfo_settimer_locked(ln, (long)V_nd6_gctimer * hz);
1656 struct mbuf *m_hold, *m_hold_next;
1659 * reset the la_hold in advance, to explicitly
1660 * prevent a la_hold lookup in nd6_output()
1661 * (wouldn't happen, though...)
1663 for (m_hold = ln->la_hold, ln->la_hold = NULL;
1664 m_hold; m_hold = m_hold_next) {
1665 m_hold_next = m_hold->m_nextpkt;
1666 m_hold->m_nextpkt = NULL;
1669 * we assume ifp is not a p2p here, so
1670 * just set the 2nd argument as the
1673 nd6_output_lle(ifp, ifp, m_hold, L3_ADDR_SIN6(ln), NULL, ln, &chain);
1676 * If we have mbufs in the chain we need to do
1677 * deferred transmit. Copy the address from the
1678 * llentry before dropping the lock down below.
1681 memcpy(&sin6, L3_ADDR_SIN6(ln), sizeof(sin6));
1683 } else if (ln->ln_state == ND6_LLINFO_INCOMPLETE) {
1684 /* probe right away */
1685 nd6_llinfo_settimer_locked((void *)ln, 0);
1690 * ICMP6 type dependent behavior.
1692 * NS: clear IsRouter if new entry
1693 * RS: clear IsRouter
1694 * RA: set IsRouter if there's lladdr
1695 * redir: clear IsRouter if new entry
1698 * The spec says that we must set IsRouter in the following cases:
1699 * - If lladdr exist, set IsRouter. This means (1-5).
1700 * - If it is old entry (!newentry), set IsRouter. This means (7).
1701 * So, based on the spec, in (1-5) and (7) cases we must set IsRouter.
1702 * A quetion arises for (1) case. (1) case has no lladdr in the
1703 * neighbor cache, this is similar to (6).
1704 * This case is rare but we figured that we MUST NOT set IsRouter.
1706 * newentry olladdr lladdr llchange NS RS RA redir
1708 * 0 n n -- (1) c ? s
1709 * 0 y n -- (2) c s s
1710 * 0 n y -- (3) c s s
1713 * 1 -- n -- (6) c c c s
1714 * 1 -- y -- (7) c c s c s
1718 switch (type & 0xff) {
1719 case ND_NEIGHBOR_SOLICIT:
1721 * New entry must have is_router flag cleared.
1723 if (is_newentry) /* (6-7) */
1728 * If the icmp is a redirect to a better router, always set the
1729 * is_router flag. Otherwise, if the entry is newly created,
1730 * clear the flag. [RFC 2461, sec 8.3]
1732 if (code == ND_REDIRECT_ROUTER)
1734 else if (is_newentry) /* (6-7) */
1737 case ND_ROUTER_SOLICIT:
1739 * is_router flag must always be cleared.
1743 case ND_ROUTER_ADVERT:
1745 * Mark an entry with lladdr as a router.
1747 if ((!is_newentry && (olladdr || lladdr)) || /* (2-5) */
1748 (is_newentry && lladdr)) { /* (7) */
1755 static_route = (ln->la_flags & LLE_STATIC);
1756 router = ln->ln_router;
1758 if (flags & ND6_EXCLUSIVE)
1766 nd6_output_flush(ifp, ifp, chain, &sin6, NULL);
1769 * When the link-layer address of a router changes, select the
1770 * best router again. In particular, when the neighbor entry is newly
1771 * created, it might affect the selection policy.
1772 * Question: can we restrict the first condition to the "is_newentry"
1774 * XXX: when we hear an RA from a new router with the link-layer
1775 * address option, defrouter_select() is called twice, since
1776 * defrtrlist_update called the function as well. However, I believe
1777 * we can compromise the overhead, since it only happens the first
1779 * XXX: although defrouter_select() should not have a bad effect
1780 * for those are not autoconfigured hosts, we explicitly avoid such
1783 if (do_update && router &&
1784 ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV) {
1786 * guaranteed recursion
1794 if (flags & ND6_EXCLUSIVE)
1805 nd6_slowtimo(void *arg)
1807 CURVNET_SET((struct vnet *) arg);
1808 struct nd_ifinfo *nd6if;
1811 callout_reset(&V_nd6_slowtimo_ch, ND6_SLOWTIMER_INTERVAL * hz,
1812 nd6_slowtimo, curvnet);
1813 IFNET_RLOCK_NOSLEEP();
1814 TAILQ_FOREACH(ifp, &V_ifnet, if_list) {
1815 if (ifp->if_afdata[AF_INET6] == NULL)
1817 nd6if = ND_IFINFO(ifp);
1818 if (nd6if->basereachable && /* already initialized */
1819 (nd6if->recalctm -= ND6_SLOWTIMER_INTERVAL) <= 0) {
1821 * Since reachable time rarely changes by router
1822 * advertisements, we SHOULD insure that a new random
1823 * value gets recomputed at least once every few hours.
1826 nd6if->recalctm = V_nd6_recalc_reachtm_interval;
1827 nd6if->reachable = ND_COMPUTE_RTIME(nd6if->basereachable);
1830 IFNET_RUNLOCK_NOSLEEP();
1835 nd6_output(struct ifnet *ifp, struct ifnet *origifp, struct mbuf *m0,
1836 struct sockaddr_in6 *dst, struct rtentry *rt0)
1839 return (nd6_output_lle(ifp, origifp, m0, dst, rt0, NULL, NULL));
1844 * Note that I'm not enforcing any global serialization
1845 * lle state or asked changes here as the logic is too
1846 * complicated to avoid having to always acquire an exclusive
1851 #define senderr(e) { error = (e); goto bad;}
1854 nd6_output_lle(struct ifnet *ifp, struct ifnet *origifp, struct mbuf *m0,
1855 struct sockaddr_in6 *dst, struct rtentry *rt0, struct llentry *lle,
1856 struct mbuf **chain)
1858 struct mbuf *m = m0;
1860 struct llentry *ln = lle;
1861 struct ip6_hdr *ip6;
1869 LLE_WLOCK_ASSERT(lle);
1871 KASSERT(chain != NULL, (" lle locked but no mbuf chain pointer passed"));
1874 if (IN6_IS_ADDR_MULTICAST(&dst->sin6_addr))
1877 if (nd6_need_cache(ifp) == 0)
1881 * next hop determination. This routine is derived from ether_output.
1885 * Address resolution or Neighbor Unreachability Detection
1887 * At this point, the destination of the packet must be a unicast
1888 * or an anycast address(i.e. not a multicast).
1891 flags = ((m != NULL) || (lle != NULL)) ? LLE_EXCLUSIVE : 0;
1894 IF_AFDATA_LOCK(ifp);
1895 ln = lla_lookup(LLTABLE6(ifp), flags, (struct sockaddr *)dst);
1896 IF_AFDATA_UNLOCK(ifp);
1897 if ((ln == NULL) && nd6_is_addr_neighbor(dst, ifp)) {
1899 * Since nd6_is_addr_neighbor() internally calls nd6_lookup(),
1900 * the condition below is not very efficient. But we believe
1901 * it is tolerable, because this should be a rare case.
1903 flags = ND6_CREATE | (m ? ND6_EXCLUSIVE : 0);
1904 IF_AFDATA_LOCK(ifp);
1905 ln = nd6_lookup(&dst->sin6_addr, flags, ifp);
1906 IF_AFDATA_UNLOCK(ifp);
1910 if ((ifp->if_flags & IFF_POINTOPOINT) == 0 &&
1911 !(ND_IFINFO(ifp)->flags & ND6_IFF_PERFORMNUD)) {
1912 char ip6buf[INET6_ADDRSTRLEN];
1914 "nd6_output: can't allocate llinfo for %s "
1916 ip6_sprintf(ip6buf, &dst->sin6_addr), ln);
1917 senderr(EIO); /* XXX: good error? */
1919 goto sendpkt; /* send anyway */
1922 /* We don't have to do link-layer address resolution on a p2p link. */
1923 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 &&
1924 ln->ln_state < ND6_LLINFO_REACHABLE) {
1925 if ((flags & LLE_EXCLUSIVE) == 0) {
1926 flags |= LLE_EXCLUSIVE;
1929 ln->ln_state = ND6_LLINFO_STALE;
1930 nd6_llinfo_settimer_locked(ln, (long)V_nd6_gctimer * hz);
1934 * The first time we send a packet to a neighbor whose entry is
1935 * STALE, we have to change the state to DELAY and a sets a timer to
1936 * expire in DELAY_FIRST_PROBE_TIME seconds to ensure do
1937 * neighbor unreachability detection on expiration.
1940 if (ln->ln_state == ND6_LLINFO_STALE) {
1941 if ((flags & LLE_EXCLUSIVE) == 0) {
1942 flags |= LLE_EXCLUSIVE;
1947 ln->ln_state = ND6_LLINFO_DELAY;
1948 nd6_llinfo_settimer_locked(ln, (long)V_nd6_delay * hz);
1952 * If the neighbor cache entry has a state other than INCOMPLETE
1953 * (i.e. its link-layer address is already resolved), just
1956 if (ln->ln_state > ND6_LLINFO_INCOMPLETE)
1960 * There is a neighbor cache entry, but no ethernet address
1961 * response yet. Append this latest packet to the end of the
1962 * packet queue in the mbuf, unless the number of the packet
1963 * does not exceed nd6_maxqueuelen. When it exceeds nd6_maxqueuelen,
1964 * the oldest packet in the queue will be removed.
1966 if (ln->ln_state == ND6_LLINFO_NOSTATE)
1967 ln->ln_state = ND6_LLINFO_INCOMPLETE;
1969 if ((flags & LLE_EXCLUSIVE) == 0) {
1970 flags |= LLE_EXCLUSIVE;
1975 LLE_WLOCK_ASSERT(ln);
1978 struct mbuf *m_hold;
1982 for (m_hold = ln->la_hold; m_hold; m_hold = m_hold->m_nextpkt) {
1984 if (m_hold->m_nextpkt == NULL) {
1985 m_hold->m_nextpkt = m;
1989 while (i >= V_nd6_maxqueuelen) {
1990 m_hold = ln->la_hold;
1991 ln->la_hold = ln->la_hold->m_nextpkt;
2000 * If there has been no NS for the neighbor after entering the
2001 * INCOMPLETE state, send the first solicitation.
2003 if (!ND6_LLINFO_PERMANENT(ln) && ln->la_asked == 0) {
2006 nd6_llinfo_settimer_locked(ln,
2007 (long)ND_IFINFO(ifp)->retrans * hz / 1000);
2009 nd6_ns_output(ifp, NULL, &dst->sin6_addr, ln, 0);
2010 if (lle != NULL && ln == lle)
2013 } else if (lle == NULL || ln != lle) {
2015 * We did the lookup (no lle arg) so we
2016 * need to do the unlock here.
2024 /* discard the packet if IPv6 operation is disabled on the interface */
2025 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)) {
2026 error = ENETDOWN; /* better error? */
2030 * ln is valid and the caller did not pass in
2033 if ((ln != NULL) && (lle == NULL)) {
2034 if (flags & LLE_EXCLUSIVE)
2041 mac_netinet6_nd6_send(ifp, m);
2045 * If called from nd6_ns_output() (NS), nd6_na_output() (NA),
2046 * icmp6_redirect_output() (REDIRECT) or from rip6_output() (RS, RA
2047 * as handled by rtsol and rtadvd), mbufs will be tagged for SeND
2048 * to be diverted to user space. When re-injected into the kernel,
2049 * send_output() will directly dispatch them to the outgoing interface.
2051 if (send_sendso_input_hook != NULL) {
2052 mtag = m_tag_find(m, PACKET_TAG_ND_OUTGOING, NULL);
2054 ip6 = mtod(m, struct ip6_hdr *);
2055 ip6len = sizeof(struct ip6_hdr) + ntohs(ip6->ip6_plen);
2056 /* Use the SEND socket */
2057 error = send_sendso_input_hook(m, ifp, SND_OUT,
2059 /* -1 == no app on SEND socket */
2060 if (error == 0 || error != -1)
2066 * We were passed in a pointer to an lle with the lock held
2067 * this means that we can't call if_output as we will
2068 * recurse on the lle lock - so what we do is we create
2069 * a list of mbufs to send and transmit them in the caller
2070 * after the lock is dropped
2079 * append mbuf to end of deferred chain
2082 while (mb->m_nextpkt != NULL)
2088 m_clrprotoflags(m); /* Avoid confusing lower layers. */
2089 IP_PROBE(send, NULL, NULL, mtod(m, struct ip6_hdr *), ifp, NULL,
2090 mtod(m, struct ip6_hdr *));
2091 if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
2092 return ((*ifp->if_output)(origifp, m, (struct sockaddr *)dst,
2095 error = (*ifp->if_output)(ifp, m, (struct sockaddr *)dst, NULL);
2100 * ln is valid and the caller did not pass in
2103 if ((ln != NULL) && (lle == NULL)) {
2104 if (flags & LLE_EXCLUSIVE)
2117 nd6_output_flush(struct ifnet *ifp, struct ifnet *origifp, struct mbuf *chain,
2118 struct sockaddr_in6 *dst, struct route *ro)
2120 struct mbuf *m, *m_head;
2121 struct ifnet *outifp;
2125 if ((ifp->if_flags & IFF_LOOPBACK) != 0)
2132 m_head = m_head->m_nextpkt;
2133 error = (*ifp->if_output)(ifp, m, (struct sockaddr *)dst, ro);
2138 * note that intermediate errors are blindly ignored - but this is
2139 * the same convention as used with nd6_output when called by
2147 nd6_need_cache(struct ifnet *ifp)
2150 * XXX: we currently do not make neighbor cache on any interface
2151 * other than ARCnet, Ethernet, FDDI and GIF.
2154 * - unidirectional tunnels needs no ND
2156 switch (ifp->if_type) {
2164 #ifdef IFT_IEEE80211
2167 case IFT_INFINIBAND:
2168 case IFT_GIF: /* XXX need more cases? */
2172 case IFT_PROPVIRTUAL:
2180 * the callers of this function need to be re-worked to drop
2181 * the lle lock, drop here for now
2184 nd6_storelladdr(struct ifnet *ifp, struct mbuf *m,
2185 const struct sockaddr *dst, u_char *desten, struct llentry **lle)
2190 IF_AFDATA_UNLOCK_ASSERT(ifp);
2191 if (m != NULL && m->m_flags & M_MCAST) {
2194 switch (ifp->if_type) {
2200 #ifdef IFT_IEEE80211
2205 ETHER_MAP_IPV6_MULTICAST(&SIN6(dst)->sin6_addr,
2210 * netbsd can use if_broadcastaddr, but we don't do so
2211 * to reduce # of ifdef.
2213 for (i = 0; i < ifp->if_addrlen; i++)
2221 return (EAFNOSUPPORT);
2227 * the entry should have been created in nd6_store_lladdr
2229 IF_AFDATA_RLOCK(ifp);
2230 ln = lla_lookup(LLTABLE6(ifp), 0, dst);
2231 IF_AFDATA_RUNLOCK(ifp);
2232 if ((ln == NULL) || !(ln->la_flags & LLE_VALID)) {
2235 /* this could happen, if we could not allocate memory */
2240 bcopy(&ln->ll_addr, desten, ifp->if_addrlen);
2244 * A *small* use after free race exists here
2250 clear_llinfo_pqueue(struct llentry *ln)
2252 struct mbuf *m_hold, *m_hold_next;
2254 for (m_hold = ln->la_hold; m_hold; m_hold = m_hold_next) {
2255 m_hold_next = m_hold->m_nextpkt;
2263 static int nd6_sysctl_drlist(SYSCTL_HANDLER_ARGS);
2264 static int nd6_sysctl_prlist(SYSCTL_HANDLER_ARGS);
2266 SYSCTL_DECL(_net_inet6_icmp6);
2268 SYSCTL_NODE(_net_inet6_icmp6, ICMPV6CTL_ND6_DRLIST, nd6_drlist,
2269 CTLFLAG_RD, nd6_sysctl_drlist, "");
2270 SYSCTL_NODE(_net_inet6_icmp6, ICMPV6CTL_ND6_PRLIST, nd6_prlist,
2271 CTLFLAG_RD, nd6_sysctl_prlist, "");
2272 SYSCTL_VNET_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_MAXQLEN, nd6_maxqueuelen,
2273 CTLFLAG_RW, &VNET_NAME(nd6_maxqueuelen), 1, "");
2276 nd6_sysctl_drlist(SYSCTL_HANDLER_ARGS)
2278 struct in6_defrouter d;
2279 struct nd_defrouter *dr;
2285 bzero(&d, sizeof(d));
2286 d.rtaddr.sin6_family = AF_INET6;
2287 d.rtaddr.sin6_len = sizeof(d.rtaddr);
2292 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) {
2293 d.rtaddr.sin6_addr = dr->rtaddr;
2294 error = sa6_recoverscope(&d.rtaddr);
2297 d.flags = dr->flags;
2298 d.rtlifetime = dr->rtlifetime;
2299 d.expire = dr->expire + (time_second - time_uptime);
2300 d.if_index = dr->ifp->if_index;
2301 error = SYSCTL_OUT(req, &d, sizeof(d));
2309 nd6_sysctl_prlist(SYSCTL_HANDLER_ARGS)
2311 struct in6_prefix p;
2312 struct sockaddr_in6 s6;
2313 struct nd_prefix *pr;
2314 struct nd_pfxrouter *pfr;
2317 char ip6buf[INET6_ADDRSTRLEN];
2322 bzero(&p, sizeof(p));
2323 p.origin = PR_ORIG_RA;
2324 bzero(&s6, sizeof(s6));
2325 s6.sin6_family = AF_INET6;
2326 s6.sin6_len = sizeof(s6);
2331 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
2332 p.prefix = pr->ndpr_prefix;
2333 if (sa6_recoverscope(&p.prefix)) {
2334 log(LOG_ERR, "scope error in prefix list (%s)\n",
2335 ip6_sprintf(ip6buf, &p.prefix.sin6_addr));
2336 /* XXX: press on... */
2338 p.raflags = pr->ndpr_raf;
2339 p.prefixlen = pr->ndpr_plen;
2340 p.vltime = pr->ndpr_vltime;
2341 p.pltime = pr->ndpr_pltime;
2342 p.if_index = pr->ndpr_ifp->if_index;
2343 if (pr->ndpr_vltime == ND6_INFINITE_LIFETIME)
2346 /* XXX: we assume time_t is signed. */
2348 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
2349 if (pr->ndpr_vltime < maxexpire - pr->ndpr_lastupdate)
2350 p.expire = pr->ndpr_lastupdate +
2352 (time_second - time_uptime);
2354 p.expire = maxexpire;
2356 p.refcnt = pr->ndpr_refcnt;
2357 p.flags = pr->ndpr_stateflags;
2359 LIST_FOREACH(pfr, &pr->ndpr_advrtrs, pfr_entry)
2361 error = SYSCTL_OUT(req, &p, sizeof(p));
2364 LIST_FOREACH(pfr, &pr->ndpr_advrtrs, pfr_entry) {
2365 s6.sin6_addr = pfr->router->rtaddr;
2366 if (sa6_recoverscope(&s6))
2368 "scope error in prefix list (%s)\n",
2369 ip6_sprintf(ip6buf, &pfr->router->rtaddr));
2370 error = SYSCTL_OUT(req, &s6, sizeof(s6));