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|M_ZERO);
180 nd->chlim = IPV6_DEFHLIM;
181 nd->basereachable = REACHABLE_TIME;
182 nd->reachable = ND_COMPUTE_RTIME(nd->basereachable);
183 nd->retrans = RETRANS_TIMER;
185 nd->flags = ND6_IFF_PERFORMNUD;
187 /* A loopback interface always has ND6_IFF_AUTO_LINKLOCAL. */
188 if (V_ip6_auto_linklocal || (ifp->if_flags & IFF_LOOPBACK))
189 nd->flags |= ND6_IFF_AUTO_LINKLOCAL;
191 /* A loopback interface does not need to accept RTADV. */
192 if (V_ip6_accept_rtadv && !(ifp->if_flags & IFF_LOOPBACK))
193 nd->flags |= ND6_IFF_ACCEPT_RTADV;
194 if (V_ip6_no_radr && !(ifp->if_flags & IFF_LOOPBACK))
195 nd->flags |= ND6_IFF_NO_RADR;
197 /* XXX: we cannot call nd6_setmtu since ifp is not fully initialized */
198 nd6_setmtu0(ifp, nd);
204 nd6_ifdetach(struct nd_ifinfo *nd)
211 * Reset ND level link MTU. This function is called when the physical MTU
212 * changes, which means we might have to adjust the ND level MTU.
215 nd6_setmtu(struct ifnet *ifp)
218 nd6_setmtu0(ifp, ND_IFINFO(ifp));
221 /* XXX todo: do not maintain copy of ifp->if_mtu in ndi->maxmtu */
223 nd6_setmtu0(struct ifnet *ifp, struct nd_ifinfo *ndi)
227 omaxmtu = ndi->maxmtu;
229 switch (ifp->if_type) {
231 ndi->maxmtu = MIN(ARC_PHDS_MAXMTU, ifp->if_mtu); /* RFC2497 */
234 ndi->maxmtu = MIN(FDDIIPMTU, ifp->if_mtu); /* RFC2467 */
237 ndi->maxmtu = MIN(ISO88025_MAX_MTU, ifp->if_mtu);
240 ndi->maxmtu = ifp->if_mtu;
245 * Decreasing the interface MTU under IPV6 minimum MTU may cause
246 * undesirable situation. We thus notify the operator of the change
247 * explicitly. The check for omaxmtu is necessary to restrict the
248 * log to the case of changing the MTU, not initializing it.
250 if (omaxmtu >= IPV6_MMTU && ndi->maxmtu < IPV6_MMTU) {
251 log(LOG_NOTICE, "nd6_setmtu0: "
252 "new link MTU on %s (%lu) is too small for IPv6\n",
253 if_name(ifp), (unsigned long)ndi->maxmtu);
256 if (ndi->maxmtu > V_in6_maxmtu)
257 in6_setmaxmtu(); /* check all interfaces just in case */
262 nd6_option_init(void *opt, int icmp6len, union nd_opts *ndopts)
265 bzero(ndopts, sizeof(*ndopts));
266 ndopts->nd_opts_search = (struct nd_opt_hdr *)opt;
268 = (struct nd_opt_hdr *)(((u_char *)opt) + icmp6len);
271 ndopts->nd_opts_done = 1;
272 ndopts->nd_opts_search = NULL;
277 * Take one ND option.
280 nd6_option(union nd_opts *ndopts)
282 struct nd_opt_hdr *nd_opt;
285 KASSERT(ndopts != NULL, ("%s: ndopts == NULL", __func__));
286 KASSERT(ndopts->nd_opts_last != NULL, ("%s: uninitialized ndopts",
288 if (ndopts->nd_opts_search == NULL)
290 if (ndopts->nd_opts_done)
293 nd_opt = ndopts->nd_opts_search;
295 /* make sure nd_opt_len is inside the buffer */
296 if ((caddr_t)&nd_opt->nd_opt_len >= (caddr_t)ndopts->nd_opts_last) {
297 bzero(ndopts, sizeof(*ndopts));
301 olen = nd_opt->nd_opt_len << 3;
304 * Message validation requires that all included
305 * options have a length that is greater than zero.
307 bzero(ndopts, sizeof(*ndopts));
311 ndopts->nd_opts_search = (struct nd_opt_hdr *)((caddr_t)nd_opt + olen);
312 if (ndopts->nd_opts_search > ndopts->nd_opts_last) {
313 /* option overruns the end of buffer, invalid */
314 bzero(ndopts, sizeof(*ndopts));
316 } else if (ndopts->nd_opts_search == ndopts->nd_opts_last) {
317 /* reached the end of options chain */
318 ndopts->nd_opts_done = 1;
319 ndopts->nd_opts_search = NULL;
325 * Parse multiple ND options.
326 * This function is much easier to use, for ND routines that do not need
327 * multiple options of the same type.
330 nd6_options(union nd_opts *ndopts)
332 struct nd_opt_hdr *nd_opt;
335 KASSERT(ndopts != NULL, ("%s: ndopts == NULL", __func__));
336 KASSERT(ndopts->nd_opts_last != NULL, ("%s: uninitialized ndopts",
338 if (ndopts->nd_opts_search == NULL)
342 nd_opt = nd6_option(ndopts);
343 if (nd_opt == NULL && ndopts->nd_opts_last == NULL) {
345 * Message validation requires that all included
346 * options have a length that is greater than zero.
348 ICMP6STAT_INC(icp6s_nd_badopt);
349 bzero(ndopts, sizeof(*ndopts));
356 switch (nd_opt->nd_opt_type) {
357 case ND_OPT_SOURCE_LINKADDR:
358 case ND_OPT_TARGET_LINKADDR:
360 case ND_OPT_REDIRECTED_HEADER:
361 if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) {
363 "duplicated ND6 option found (type=%d)\n",
364 nd_opt->nd_opt_type));
367 ndopts->nd_opt_array[nd_opt->nd_opt_type]
371 case ND_OPT_PREFIX_INFORMATION:
372 if (ndopts->nd_opt_array[nd_opt->nd_opt_type] == 0) {
373 ndopts->nd_opt_array[nd_opt->nd_opt_type]
376 ndopts->nd_opts_pi_end =
377 (struct nd_opt_prefix_info *)nd_opt;
379 /* What about ND_OPT_ROUTE_INFO? RFC 4191 */
380 case ND_OPT_RDNSS: /* RFC 6106 */
381 case ND_OPT_DNSSL: /* RFC 6106 */
383 * Silently ignore options we know and do not care about
389 * Unknown options must be silently ignored,
390 * to accomodate future extension to the protocol.
393 "nd6_options: unsupported option %d - "
394 "option ignored\n", nd_opt->nd_opt_type));
399 if (i > V_nd6_maxndopt) {
400 ICMP6STAT_INC(icp6s_nd_toomanyopt);
401 nd6log((LOG_INFO, "too many loop in nd opt\n"));
405 if (ndopts->nd_opts_done)
413 * ND6 timer routine to handle ND6 entries
416 nd6_llinfo_settimer_locked(struct llentry *ln, long tick)
420 LLE_WLOCK_ASSERT(ln);
425 canceled = callout_stop(&ln->ln_timer_ch);
427 ln->la_expire = time_second + tick / hz;
429 if (tick > INT_MAX) {
430 ln->ln_ntick = tick - INT_MAX;
431 canceled = callout_reset(&ln->ln_timer_ch, INT_MAX,
432 nd6_llinfo_timer, ln);
435 canceled = callout_reset(&ln->ln_timer_ch, tick,
436 nd6_llinfo_timer, ln);
444 nd6_llinfo_settimer(struct llentry *ln, long tick)
448 nd6_llinfo_settimer_locked(ln, tick);
453 nd6_llinfo_timer(void *arg)
456 struct in6_addr *dst;
458 struct nd_ifinfo *ndi = NULL;
460 KASSERT(arg != NULL, ("%s: arg NULL", __func__));
461 ln = (struct llentry *)arg;
462 LLE_WLOCK_ASSERT(ln);
463 ifp = ln->lle_tbl->llt_ifp;
465 CURVNET_SET(ifp->if_vnet);
467 if (ln->ln_ntick > 0) {
468 if (ln->ln_ntick > INT_MAX) {
469 ln->ln_ntick -= INT_MAX;
470 nd6_llinfo_settimer_locked(ln, INT_MAX);
473 nd6_llinfo_settimer_locked(ln, ln->ln_ntick);
478 ndi = ND_IFINFO(ifp);
479 dst = &L3_ADDR_SIN6(ln)->sin6_addr;
480 if (ln->la_flags & LLE_STATIC) {
484 if (ln->la_flags & LLE_DELETED) {
485 (void)nd6_free(ln, 0);
490 switch (ln->ln_state) {
491 case ND6_LLINFO_INCOMPLETE:
492 if (ln->la_asked < V_nd6_mmaxtries) {
494 nd6_llinfo_settimer_locked(ln, (long)ndi->retrans * hz / 1000);
496 nd6_ns_output(ifp, NULL, dst, ln, 0);
499 struct mbuf *m = ln->la_hold;
504 * assuming every packet in la_hold has the
505 * same IP header. Send error after unlock.
510 clear_llinfo_pqueue(ln);
512 (void)nd6_free(ln, 0);
515 icmp6_error2(m, ICMP6_DST_UNREACH,
516 ICMP6_DST_UNREACH_ADDR, 0, ifp);
519 case ND6_LLINFO_REACHABLE:
520 if (!ND6_LLINFO_PERMANENT(ln)) {
521 ln->ln_state = ND6_LLINFO_STALE;
522 nd6_llinfo_settimer_locked(ln, (long)V_nd6_gctimer * hz);
526 case ND6_LLINFO_STALE:
527 /* Garbage Collection(RFC 2461 5.3) */
528 if (!ND6_LLINFO_PERMANENT(ln)) {
529 (void)nd6_free(ln, 1);
534 case ND6_LLINFO_DELAY:
535 if (ndi && (ndi->flags & ND6_IFF_PERFORMNUD) != 0) {
538 ln->ln_state = ND6_LLINFO_PROBE;
539 nd6_llinfo_settimer_locked(ln, (long)ndi->retrans * hz / 1000);
541 nd6_ns_output(ifp, dst, dst, ln, 0);
544 ln->ln_state = ND6_LLINFO_STALE; /* XXX */
545 nd6_llinfo_settimer_locked(ln, (long)V_nd6_gctimer * hz);
548 case ND6_LLINFO_PROBE:
549 if (ln->la_asked < V_nd6_umaxtries) {
551 nd6_llinfo_settimer_locked(ln, (long)ndi->retrans * hz / 1000);
553 nd6_ns_output(ifp, dst, dst, ln, 0);
556 (void)nd6_free(ln, 0);
561 panic("%s: paths in a dark night can be confusing: %d",
562 __func__, ln->ln_state);
572 * ND6 timer routine to expire default route list and prefix list
577 CURVNET_SET((struct vnet *) arg);
579 struct nd_defrouter *dr, *ndr;
580 struct nd_prefix *pr, *npr;
581 struct in6_ifaddr *ia6, *nia6;
583 callout_reset(&V_nd6_timer_ch, V_nd6_prune * hz,
586 /* expire default router list */
588 TAILQ_FOREACH_SAFE(dr, &V_nd_defrouter, dr_entry, ndr) {
589 if (dr->expire && dr->expire < time_second)
594 * expire interface addresses.
595 * in the past the loop was inside prefix expiry processing.
596 * However, from a stricter speci-confrmance standpoint, we should
597 * rather separate address lifetimes and prefix lifetimes.
599 * XXXRW: in6_ifaddrhead locking.
602 TAILQ_FOREACH_SAFE(ia6, &V_in6_ifaddrhead, ia_link, nia6) {
603 /* check address lifetime */
604 if (IFA6_IS_INVALID(ia6)) {
608 * If the expiring address is temporary, try
609 * regenerating a new one. This would be useful when
610 * we suspended a laptop PC, then turned it on after a
611 * period that could invalidate all temporary
612 * addresses. Although we may have to restart the
613 * loop (see below), it must be after purging the
614 * address. Otherwise, we'd see an infinite loop of
617 if (V_ip6_use_tempaddr &&
618 (ia6->ia6_flags & IN6_IFF_TEMPORARY) != 0) {
619 if (regen_tmpaddr(ia6) == 0)
623 in6_purgeaddr(&ia6->ia_ifa);
626 goto addrloop; /* XXX: see below */
627 } else if (IFA6_IS_DEPRECATED(ia6)) {
628 int oldflags = ia6->ia6_flags;
630 ia6->ia6_flags |= IN6_IFF_DEPRECATED;
633 * If a temporary address has just become deprecated,
634 * regenerate a new one if possible.
636 if (V_ip6_use_tempaddr &&
637 (ia6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
638 (oldflags & IN6_IFF_DEPRECATED) == 0) {
640 if (regen_tmpaddr(ia6) == 0) {
642 * A new temporary address is
644 * XXX: this means the address chain
645 * has changed while we are still in
646 * the loop. Although the change
647 * would not cause disaster (because
648 * it's not a deletion, but an
649 * addition,) we'd rather restart the
650 * loop just for safety. Or does this
651 * significantly reduce performance??
658 * A new RA might have made a deprecated address
661 ia6->ia6_flags &= ~IN6_IFF_DEPRECATED;
665 /* expire prefix list */
666 LIST_FOREACH_SAFE(pr, &V_nd_prefix, ndpr_entry, npr) {
668 * check prefix lifetime.
669 * since pltime is just for autoconf, pltime processing for
670 * prefix is not necessary.
672 if (pr->ndpr_vltime != ND6_INFINITE_LIFETIME &&
673 time_second - pr->ndpr_lastupdate > pr->ndpr_vltime) {
676 * address expiration and prefix expiration are
677 * separate. NEVER perform in6_purgeaddr here.
687 * ia6 - deprecated/invalidated temporary address
690 regen_tmpaddr(struct in6_ifaddr *ia6)
694 struct in6_ifaddr *public_ifa6 = NULL;
696 ifp = ia6->ia_ifa.ifa_ifp;
698 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
699 struct in6_ifaddr *it6;
701 if (ifa->ifa_addr->sa_family != AF_INET6)
704 it6 = (struct in6_ifaddr *)ifa;
706 /* ignore no autoconf addresses. */
707 if ((it6->ia6_flags & IN6_IFF_AUTOCONF) == 0)
710 /* ignore autoconf addresses with different prefixes. */
711 if (it6->ia6_ndpr == NULL || it6->ia6_ndpr != ia6->ia6_ndpr)
715 * Now we are looking at an autoconf address with the same
716 * prefix as ours. If the address is temporary and is still
717 * preferred, do not create another one. It would be rare, but
718 * could happen, for example, when we resume a laptop PC after
721 if ((it6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
722 !IFA6_IS_DEPRECATED(it6)) {
728 * This is a public autoconf address that has the same prefix
729 * as ours. If it is preferred, keep it. We can't break the
730 * loop here, because there may be a still-preferred temporary
731 * address with the prefix.
733 if (!IFA6_IS_DEPRECATED(it6))
736 if (public_ifa6 != NULL)
737 ifa_ref(&public_ifa6->ia_ifa);
739 IF_ADDR_RUNLOCK(ifp);
741 if (public_ifa6 != NULL) {
744 if ((e = in6_tmpifadd(public_ifa6, 0, 0)) != 0) {
745 ifa_free(&public_ifa6->ia_ifa);
746 log(LOG_NOTICE, "regen_tmpaddr: failed to create a new"
747 " tmp addr,errno=%d\n", e);
750 ifa_free(&public_ifa6->ia_ifa);
758 * Nuke neighbor cache/prefix/default router management table, right before
762 nd6_purge(struct ifnet *ifp)
764 struct nd_defrouter *dr, *ndr;
765 struct nd_prefix *pr, *npr;
768 * Nuke default router list entries toward ifp.
769 * We defer removal of default router list entries that is installed
770 * in the routing table, in order to keep additional side effects as
773 TAILQ_FOREACH_SAFE(dr, &V_nd_defrouter, dr_entry, ndr) {
781 TAILQ_FOREACH_SAFE(dr, &V_nd_defrouter, dr_entry, ndr) {
789 /* Nuke prefix list entries toward ifp */
790 LIST_FOREACH_SAFE(pr, &V_nd_prefix, ndpr_entry, npr) {
791 if (pr->ndpr_ifp == ifp) {
793 * Because if_detach() does *not* release prefixes
794 * while purging addresses the reference count will
795 * still be above zero. We therefore reset it to
796 * make sure that the prefix really gets purged.
801 * Previously, pr->ndpr_addr is removed as well,
802 * but I strongly believe we don't have to do it.
803 * nd6_purge() is only called from in6_ifdetach(),
804 * which removes all the associated interface addresses
806 * (jinmei@kame.net 20010129)
812 /* cancel default outgoing interface setting */
813 if (V_nd6_defifindex == ifp->if_index)
814 nd6_setdefaultiface(0);
816 if (ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV) {
817 /* Refresh default router list. */
822 * We do not nuke the neighbor cache entries here any more
823 * because the neighbor cache is kept in if_afdata[AF_INET6].
824 * nd6_purge() is invoked by in6_ifdetach() which is called
825 * from if_detach() where everything gets purged. So let
826 * in6_domifdetach() do the actual L2 table purging work.
831 * the caller acquires and releases the lock on the lltbls
832 * Returns the llentry locked
835 nd6_lookup(struct in6_addr *addr6, int flags, struct ifnet *ifp)
837 struct sockaddr_in6 sin6;
841 bzero(&sin6, sizeof(sin6));
842 sin6.sin6_len = sizeof(struct sockaddr_in6);
843 sin6.sin6_family = AF_INET6;
844 sin6.sin6_addr = *addr6;
846 IF_AFDATA_LOCK_ASSERT(ifp);
849 if (flags & ND6_CREATE)
850 llflags |= LLE_CREATE;
851 if (flags & ND6_EXCLUSIVE)
852 llflags |= LLE_EXCLUSIVE;
854 ln = lla_lookup(LLTABLE6(ifp), llflags, (struct sockaddr *)&sin6);
855 if ((ln != NULL) && (llflags & LLE_CREATE))
856 ln->ln_state = ND6_LLINFO_NOSTATE;
862 * Test whether a given IPv6 address is a neighbor or not, ignoring
863 * the actual neighbor cache. The neighbor cache is ignored in order
864 * to not reenter the routing code from within itself.
867 nd6_is_new_addr_neighbor(struct sockaddr_in6 *addr, struct ifnet *ifp)
869 struct nd_prefix *pr;
870 struct ifaddr *dstaddr;
873 * A link-local address is always a neighbor.
874 * XXX: a link does not necessarily specify a single interface.
876 if (IN6_IS_ADDR_LINKLOCAL(&addr->sin6_addr)) {
877 struct sockaddr_in6 sin6_copy;
881 * We need sin6_copy since sa6_recoverscope() may modify the
885 if (sa6_recoverscope(&sin6_copy))
886 return (0); /* XXX: should be impossible */
887 if (in6_setscope(&sin6_copy.sin6_addr, ifp, &zone))
889 if (sin6_copy.sin6_scope_id == zone)
896 * If the address matches one of our addresses,
897 * it should be a neighbor.
898 * If the address matches one of our on-link prefixes, it should be a
901 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
902 if (pr->ndpr_ifp != ifp)
905 if (!(pr->ndpr_stateflags & NDPRF_ONLINK)) {
908 /* Always use the default FIB here. */
909 rt = in6_rtalloc1((struct sockaddr *)&pr->ndpr_prefix,
910 0, 0, RT_DEFAULT_FIB);
914 * This is the case where multiple interfaces
915 * have the same prefix, but only one is installed
916 * into the routing table and that prefix entry
917 * is not the one being examined here. In the case
918 * where RADIX_MPATH is enabled, multiple route
919 * entries (of the same rt_key value) will be
920 * installed because the interface addresses all
923 if (!IN6_ARE_ADDR_EQUAL(&pr->ndpr_prefix.sin6_addr,
924 &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr)) {
931 if (IN6_ARE_MASKED_ADDR_EQUAL(&pr->ndpr_prefix.sin6_addr,
932 &addr->sin6_addr, &pr->ndpr_mask))
937 * If the address is assigned on the node of the other side of
938 * a p2p interface, the address should be a neighbor.
940 dstaddr = ifa_ifwithdstaddr((struct sockaddr *)addr);
941 if (dstaddr != NULL) {
942 if (dstaddr->ifa_ifp == ifp) {
950 * If the default router list is empty, all addresses are regarded
951 * as on-link, and thus, as a neighbor.
953 if (ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV &&
954 TAILQ_EMPTY(&V_nd_defrouter) &&
955 V_nd6_defifindex == ifp->if_index) {
964 * Detect if a given IPv6 address identifies a neighbor on a given link.
965 * XXX: should take care of the destination of a p2p link?
968 nd6_is_addr_neighbor(struct sockaddr_in6 *addr, struct ifnet *ifp)
973 IF_AFDATA_UNLOCK_ASSERT(ifp);
974 if (nd6_is_new_addr_neighbor(addr, ifp))
978 * Even if the address matches none of our addresses, it might be
979 * in the neighbor cache.
982 if ((lle = nd6_lookup(&addr->sin6_addr, 0, ifp)) != NULL) {
986 IF_AFDATA_UNLOCK(ifp);
991 * Free an nd6 llinfo entry.
992 * Since the function would cause significant changes in the kernel, DO NOT
993 * make it global, unless you have a strong reason for the change, and are sure
994 * that the change is safe.
996 static struct llentry *
997 nd6_free(struct llentry *ln, int gc)
999 struct llentry *next;
1000 struct nd_defrouter *dr;
1003 LLE_WLOCK_ASSERT(ln);
1006 * we used to have pfctlinput(PRC_HOSTDEAD) here.
1007 * even though it is not harmful, it was not really necessary.
1011 nd6_llinfo_settimer_locked(ln, -1);
1013 ifp = ln->lle_tbl->llt_ifp;
1015 if (ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV) {
1016 dr = defrouter_lookup(&L3_ADDR_SIN6(ln)->sin6_addr, ifp);
1018 if (dr != NULL && dr->expire &&
1019 ln->ln_state == ND6_LLINFO_STALE && gc) {
1021 * If the reason for the deletion is just garbage
1022 * collection, and the neighbor is an active default
1023 * router, do not delete it. Instead, reset the GC
1024 * timer using the router's lifetime.
1025 * Simply deleting the entry would affect default
1026 * router selection, which is not necessarily a good
1027 * thing, especially when we're using router preference
1029 * XXX: the check for ln_state would be redundant,
1030 * but we intentionally keep it just in case.
1032 if (dr->expire > time_second)
1033 nd6_llinfo_settimer_locked(ln,
1034 (dr->expire - time_second) * hz);
1036 nd6_llinfo_settimer_locked(ln,
1037 (long)V_nd6_gctimer * hz);
1039 next = LIST_NEXT(ln, lle_next);
1047 * Unreachablity of a router might affect the default
1048 * router selection and on-link detection of advertised
1053 * Temporarily fake the state to choose a new default
1054 * router and to perform on-link determination of
1055 * prefixes correctly.
1056 * Below the state will be set correctly,
1057 * or the entry itself will be deleted.
1059 ln->ln_state = ND6_LLINFO_INCOMPLETE;
1062 if (ln->ln_router || dr) {
1065 * We need to unlock to avoid a LOR with rt6_flush() with the
1066 * rnh and for the calls to pfxlist_onlink_check() and
1067 * defrouter_select() in the block further down for calls
1068 * into nd6_lookup(). We still hold a ref.
1073 * rt6_flush must be called whether or not the neighbor
1074 * is in the Default Router List.
1075 * See a corresponding comment in nd6_na_input().
1077 rt6_flush(&L3_ADDR_SIN6(ln)->sin6_addr, ifp);
1082 * Since defrouter_select() does not affect the
1083 * on-link determination and MIP6 needs the check
1084 * before the default router selection, we perform
1087 pfxlist_onlink_check();
1090 * Refresh default router list.
1095 if (ln->ln_router || dr)
1100 * Before deleting the entry, remember the next entry as the
1101 * return value. We need this because pfxlist_onlink_check() above
1102 * might have freed other entries (particularly the old next entry) as
1103 * a side effect (XXX).
1105 next = LIST_NEXT(ln, lle_next);
1108 * Save to unlock. We still hold an extra reference and will not
1109 * free(9) in llentry_free() if someone else holds one as well.
1112 IF_AFDATA_LOCK(ifp);
1116 IF_AFDATA_UNLOCK(ifp);
1122 * Upper-layer reachability hint for Neighbor Unreachability Detection.
1124 * XXX cost-effective methods?
1127 nd6_nud_hint(struct rtentry *rt, struct in6_addr *dst6, int force)
1132 if ((dst6 == NULL) || (rt == NULL))
1136 IF_AFDATA_LOCK(ifp);
1137 ln = nd6_lookup(dst6, ND6_EXCLUSIVE, NULL);
1138 IF_AFDATA_UNLOCK(ifp);
1142 if (ln->ln_state < ND6_LLINFO_REACHABLE)
1146 * if we get upper-layer reachability confirmation many times,
1147 * it is possible we have false information.
1151 if (ln->ln_byhint > V_nd6_maxnudhint) {
1156 ln->ln_state = ND6_LLINFO_REACHABLE;
1157 if (!ND6_LLINFO_PERMANENT(ln)) {
1158 nd6_llinfo_settimer_locked(ln,
1159 (long)ND_IFINFO(rt->rt_ifp)->reachable * hz);
1167 * Rejuvenate this function for routing operations related
1171 nd6_rtrequest(int req, struct rtentry *rt, struct rt_addrinfo *info)
1173 struct sockaddr_in6 *gateway;
1174 struct nd_defrouter *dr;
1178 gateway = (struct sockaddr_in6 *)rt->rt_gateway;
1189 * Only indirect routes are interesting.
1191 if ((rt->rt_flags & RTF_GATEWAY) == 0)
1194 * check for default route
1196 if (IN6_ARE_ADDR_EQUAL(&in6addr_any,
1197 &SIN6(rt_key(rt))->sin6_addr)) {
1199 dr = defrouter_lookup(&gateway->sin6_addr, ifp);
1209 nd6_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp)
1211 struct in6_drlist *drl = (struct in6_drlist *)data;
1212 struct in6_oprlist *oprl = (struct in6_oprlist *)data;
1213 struct in6_ndireq *ndi = (struct in6_ndireq *)data;
1214 struct in6_nbrinfo *nbi = (struct in6_nbrinfo *)data;
1215 struct in6_ndifreq *ndif = (struct in6_ndifreq *)data;
1216 struct nd_defrouter *dr;
1217 struct nd_prefix *pr;
1218 int i = 0, error = 0;
1222 case SIOCGDRLST_IN6:
1224 * obsolete API, use sysctl under net.inet6.icmp6
1226 bzero(drl, sizeof(*drl));
1228 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) {
1231 drl->defrouter[i].rtaddr = dr->rtaddr;
1232 in6_clearscope(&drl->defrouter[i].rtaddr);
1234 drl->defrouter[i].flags = dr->flags;
1235 drl->defrouter[i].rtlifetime = dr->rtlifetime;
1236 drl->defrouter[i].expire = dr->expire;
1237 drl->defrouter[i].if_index = dr->ifp->if_index;
1242 case SIOCGPRLST_IN6:
1244 * obsolete API, use sysctl under net.inet6.icmp6
1246 * XXX the structure in6_prlist was changed in backward-
1247 * incompatible manner. in6_oprlist is used for SIOCGPRLST_IN6,
1248 * in6_prlist is used for nd6_sysctl() - fill_prlist().
1251 * XXX meaning of fields, especialy "raflags", is very
1252 * differnet between RA prefix list and RR/static prefix list.
1253 * how about separating ioctls into two?
1255 bzero(oprl, sizeof(*oprl));
1257 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
1258 struct nd_pfxrouter *pfr;
1263 oprl->prefix[i].prefix = pr->ndpr_prefix.sin6_addr;
1264 oprl->prefix[i].raflags = pr->ndpr_raf;
1265 oprl->prefix[i].prefixlen = pr->ndpr_plen;
1266 oprl->prefix[i].vltime = pr->ndpr_vltime;
1267 oprl->prefix[i].pltime = pr->ndpr_pltime;
1268 oprl->prefix[i].if_index = pr->ndpr_ifp->if_index;
1269 if (pr->ndpr_vltime == ND6_INFINITE_LIFETIME)
1270 oprl->prefix[i].expire = 0;
1274 /* XXX: we assume time_t is signed. */
1277 ((sizeof(maxexpire) * 8) - 1));
1278 if (pr->ndpr_vltime <
1279 maxexpire - pr->ndpr_lastupdate) {
1280 oprl->prefix[i].expire =
1281 pr->ndpr_lastupdate +
1284 oprl->prefix[i].expire = maxexpire;
1288 LIST_FOREACH(pfr, &pr->ndpr_advrtrs, pfr_entry) {
1290 #define RTRADDR oprl->prefix[i].advrtr[j]
1291 RTRADDR = pfr->router->rtaddr;
1292 in6_clearscope(&RTRADDR);
1297 oprl->prefix[i].advrtrs = j;
1298 oprl->prefix[i].origin = PR_ORIG_RA;
1305 case OSIOCGIFINFO_IN6:
1307 /* XXX: old ndp(8) assumes a positive value for linkmtu. */
1308 bzero(&ND, sizeof(ND));
1309 ND.linkmtu = IN6_LINKMTU(ifp);
1310 ND.maxmtu = ND_IFINFO(ifp)->maxmtu;
1311 ND.basereachable = ND_IFINFO(ifp)->basereachable;
1312 ND.reachable = ND_IFINFO(ifp)->reachable;
1313 ND.retrans = ND_IFINFO(ifp)->retrans;
1314 ND.flags = ND_IFINFO(ifp)->flags;
1315 ND.recalctm = ND_IFINFO(ifp)->recalctm;
1316 ND.chlim = ND_IFINFO(ifp)->chlim;
1318 case SIOCGIFINFO_IN6:
1319 ND = *ND_IFINFO(ifp);
1321 case SIOCSIFINFO_IN6:
1323 * used to change host variables from userland.
1324 * intented for a use on router to reflect RA configurations.
1326 /* 0 means 'unspecified' */
1327 if (ND.linkmtu != 0) {
1328 if (ND.linkmtu < IPV6_MMTU ||
1329 ND.linkmtu > IN6_LINKMTU(ifp)) {
1333 ND_IFINFO(ifp)->linkmtu = ND.linkmtu;
1336 if (ND.basereachable != 0) {
1337 int obasereachable = ND_IFINFO(ifp)->basereachable;
1339 ND_IFINFO(ifp)->basereachable = ND.basereachable;
1340 if (ND.basereachable != obasereachable)
1341 ND_IFINFO(ifp)->reachable =
1342 ND_COMPUTE_RTIME(ND.basereachable);
1344 if (ND.retrans != 0)
1345 ND_IFINFO(ifp)->retrans = ND.retrans;
1347 ND_IFINFO(ifp)->chlim = ND.chlim;
1349 case SIOCSIFINFO_FLAGS:
1352 struct in6_ifaddr *ia;
1354 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) &&
1355 !(ND.flags & ND6_IFF_IFDISABLED)) {
1356 /* ifdisabled 1->0 transision */
1359 * If the interface is marked as ND6_IFF_IFDISABLED and
1360 * has an link-local address with IN6_IFF_DUPLICATED,
1361 * do not clear ND6_IFF_IFDISABLED.
1362 * See RFC 4862, Section 5.4.5.
1364 int duplicated_linklocal = 0;
1367 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1368 if (ifa->ifa_addr->sa_family != AF_INET6)
1370 ia = (struct in6_ifaddr *)ifa;
1371 if ((ia->ia6_flags & IN6_IFF_DUPLICATED) &&
1372 IN6_IS_ADDR_LINKLOCAL(IA6_IN6(ia))) {
1373 duplicated_linklocal = 1;
1377 IF_ADDR_RUNLOCK(ifp);
1379 if (duplicated_linklocal) {
1380 ND.flags |= ND6_IFF_IFDISABLED;
1381 log(LOG_ERR, "Cannot enable an interface"
1382 " with a link-local address marked"
1385 ND_IFINFO(ifp)->flags &= ~ND6_IFF_IFDISABLED;
1386 if (ifp->if_flags & IFF_UP)
1389 } else if (!(ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) &&
1390 (ND.flags & ND6_IFF_IFDISABLED)) {
1391 /* ifdisabled 0->1 transision */
1392 /* Mark all IPv6 address as tentative. */
1394 ND_IFINFO(ifp)->flags |= ND6_IFF_IFDISABLED;
1396 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1397 if (ifa->ifa_addr->sa_family != AF_INET6)
1399 ia = (struct in6_ifaddr *)ifa;
1400 ia->ia6_flags |= IN6_IFF_TENTATIVE;
1402 IF_ADDR_RUNLOCK(ifp);
1405 if (ND.flags & ND6_IFF_AUTO_LINKLOCAL) {
1406 if (!(ND_IFINFO(ifp)->flags & ND6_IFF_AUTO_LINKLOCAL)) {
1407 /* auto_linklocal 0->1 transision */
1409 /* If no link-local address on ifp, configure */
1410 ND_IFINFO(ifp)->flags |= ND6_IFF_AUTO_LINKLOCAL;
1411 in6_ifattach(ifp, NULL);
1412 } else if (!(ND.flags & ND6_IFF_IFDISABLED) &&
1413 ifp->if_flags & IFF_UP) {
1415 * When the IF already has
1416 * ND6_IFF_AUTO_LINKLOCAL, no link-local
1417 * address is assigned, and IFF_UP, try to
1420 int haslinklocal = 0;
1423 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1424 if (ifa->ifa_addr->sa_family != AF_INET6)
1426 ia = (struct in6_ifaddr *)ifa;
1427 if (IN6_IS_ADDR_LINKLOCAL(IA6_IN6(ia))) {
1432 IF_ADDR_RUNLOCK(ifp);
1434 in6_ifattach(ifp, NULL);
1438 ND_IFINFO(ifp)->flags = ND.flags;
1441 case SIOCSNDFLUSH_IN6: /* XXX: the ioctl name is confusing... */
1442 /* sync kernel routing table with the default router list */
1446 case SIOCSPFXFLUSH_IN6:
1448 /* flush all the prefix advertised by routers */
1449 struct nd_prefix *pr, *next;
1452 LIST_FOREACH_SAFE(pr, &V_nd_prefix, ndpr_entry, next) {
1453 struct in6_ifaddr *ia, *ia_next;
1455 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
1458 /* do we really have to remove addresses as well? */
1459 /* XXXRW: in6_ifaddrhead locking. */
1460 TAILQ_FOREACH_SAFE(ia, &V_in6_ifaddrhead, ia_link,
1462 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) == 0)
1465 if (ia->ia6_ndpr == pr)
1466 in6_purgeaddr(&ia->ia_ifa);
1473 case SIOCSRTRFLUSH_IN6:
1475 /* flush all the default routers */
1476 struct nd_defrouter *dr, *next;
1480 TAILQ_FOREACH_SAFE(dr, &V_nd_defrouter, dr_entry, next) {
1487 case SIOCGNBRINFO_IN6:
1490 struct in6_addr nb_addr = nbi->addr; /* make local for safety */
1492 if ((error = in6_setscope(&nb_addr, ifp, NULL)) != 0)
1495 IF_AFDATA_LOCK(ifp);
1496 ln = nd6_lookup(&nb_addr, 0, ifp);
1497 IF_AFDATA_UNLOCK(ifp);
1503 nbi->state = ln->ln_state;
1504 nbi->asked = ln->la_asked;
1505 nbi->isrouter = ln->ln_router;
1506 nbi->expire = ln->la_expire;
1510 case SIOCGDEFIFACE_IN6: /* XXX: should be implemented as a sysctl? */
1511 ndif->ifindex = V_nd6_defifindex;
1513 case SIOCSDEFIFACE_IN6: /* XXX: should be implemented as a sysctl? */
1514 return (nd6_setdefaultiface(ndif->ifindex));
1520 * Create neighbor cache entry and cache link-layer address,
1521 * on reception of inbound ND6 packets. (RS/RA/NS/redirect)
1524 * code - type dependent information
1527 * The caller of this function already acquired the ndp
1528 * cache table lock because the cache entry is returned.
1531 nd6_cache_lladdr(struct ifnet *ifp, struct in6_addr *from, char *lladdr,
1532 int lladdrlen, int type, int code)
1534 struct llentry *ln = NULL;
1541 uint16_t router = 0;
1542 struct sockaddr_in6 sin6;
1543 struct mbuf *chain = NULL;
1544 int static_route = 0;
1546 IF_AFDATA_UNLOCK_ASSERT(ifp);
1548 KASSERT(ifp != NULL, ("%s: ifp == NULL", __func__));
1549 KASSERT(from != NULL, ("%s: from == NULL", __func__));
1551 /* nothing must be updated for unspecified address */
1552 if (IN6_IS_ADDR_UNSPECIFIED(from))
1556 * Validation about ifp->if_addrlen and lladdrlen must be done in
1559 * XXX If the link does not have link-layer adderss, what should
1560 * we do? (ifp->if_addrlen == 0)
1561 * Spec says nothing in sections for RA, RS and NA. There's small
1562 * description on it in NS section (RFC 2461 7.2.3).
1564 flags = lladdr ? ND6_EXCLUSIVE : 0;
1565 IF_AFDATA_LOCK(ifp);
1566 ln = nd6_lookup(from, flags, ifp);
1569 flags |= ND6_EXCLUSIVE;
1570 ln = nd6_lookup(from, flags | ND6_CREATE, ifp);
1571 IF_AFDATA_UNLOCK(ifp);
1574 IF_AFDATA_UNLOCK(ifp);
1575 /* do nothing if static ndp is set */
1576 if (ln->la_flags & LLE_STATIC) {
1585 olladdr = (ln->la_flags & LLE_VALID) ? 1 : 0;
1586 if (olladdr && lladdr) {
1587 llchange = bcmp(lladdr, &ln->ll_addr,
1593 * newentry olladdr lladdr llchange (*=record)
1596 * 0 n y -- (3) * STALE
1598 * 0 y y y (5) * STALE
1599 * 1 -- n -- (6) NOSTATE(= PASSIVE)
1600 * 1 -- y -- (7) * STALE
1603 if (lladdr) { /* (3-5) and (7) */
1605 * Record source link-layer address
1606 * XXX is it dependent to ifp->if_type?
1608 bcopy(lladdr, &ln->ll_addr, ifp->if_addrlen);
1609 ln->la_flags |= LLE_VALID;
1613 if ((!olladdr && lladdr != NULL) || /* (3) */
1614 (olladdr && lladdr != NULL && llchange)) { /* (5) */
1616 newstate = ND6_LLINFO_STALE;
1617 } else /* (1-2,4) */
1621 if (lladdr == NULL) /* (6) */
1622 newstate = ND6_LLINFO_NOSTATE;
1624 newstate = ND6_LLINFO_STALE;
1629 * Update the state of the neighbor cache.
1631 ln->ln_state = newstate;
1633 if (ln->ln_state == ND6_LLINFO_STALE) {
1635 * XXX: since nd6_output() below will cause
1636 * state tansition to DELAY and reset the timer,
1637 * we must set the timer now, although it is actually
1640 nd6_llinfo_settimer_locked(ln, (long)V_nd6_gctimer * hz);
1643 struct mbuf *m_hold, *m_hold_next;
1646 * reset the la_hold in advance, to explicitly
1647 * prevent a la_hold lookup in nd6_output()
1648 * (wouldn't happen, though...)
1650 for (m_hold = ln->la_hold, ln->la_hold = NULL;
1651 m_hold; m_hold = m_hold_next) {
1652 m_hold_next = m_hold->m_nextpkt;
1653 m_hold->m_nextpkt = NULL;
1656 * we assume ifp is not a p2p here, so
1657 * just set the 2nd argument as the
1660 nd6_output_lle(ifp, ifp, m_hold, L3_ADDR_SIN6(ln), NULL, ln, &chain);
1663 * If we have mbufs in the chain we need to do
1664 * deferred transmit. Copy the address from the
1665 * llentry before dropping the lock down below.
1668 memcpy(&sin6, L3_ADDR_SIN6(ln), sizeof(sin6));
1670 } else if (ln->ln_state == ND6_LLINFO_INCOMPLETE) {
1671 /* probe right away */
1672 nd6_llinfo_settimer_locked((void *)ln, 0);
1677 * ICMP6 type dependent behavior.
1679 * NS: clear IsRouter if new entry
1680 * RS: clear IsRouter
1681 * RA: set IsRouter if there's lladdr
1682 * redir: clear IsRouter if new entry
1685 * The spec says that we must set IsRouter in the following cases:
1686 * - If lladdr exist, set IsRouter. This means (1-5).
1687 * - If it is old entry (!newentry), set IsRouter. This means (7).
1688 * So, based on the spec, in (1-5) and (7) cases we must set IsRouter.
1689 * A quetion arises for (1) case. (1) case has no lladdr in the
1690 * neighbor cache, this is similar to (6).
1691 * This case is rare but we figured that we MUST NOT set IsRouter.
1693 * newentry olladdr lladdr llchange NS RS RA redir
1695 * 0 n n -- (1) c ? s
1696 * 0 y n -- (2) c s s
1697 * 0 n y -- (3) c s s
1700 * 1 -- n -- (6) c c c s
1701 * 1 -- y -- (7) c c s c s
1705 switch (type & 0xff) {
1706 case ND_NEIGHBOR_SOLICIT:
1708 * New entry must have is_router flag cleared.
1710 if (is_newentry) /* (6-7) */
1715 * If the icmp is a redirect to a better router, always set the
1716 * is_router flag. Otherwise, if the entry is newly created,
1717 * clear the flag. [RFC 2461, sec 8.3]
1719 if (code == ND_REDIRECT_ROUTER)
1721 else if (is_newentry) /* (6-7) */
1724 case ND_ROUTER_SOLICIT:
1726 * is_router flag must always be cleared.
1730 case ND_ROUTER_ADVERT:
1732 * Mark an entry with lladdr as a router.
1734 if ((!is_newentry && (olladdr || lladdr)) || /* (2-5) */
1735 (is_newentry && lladdr)) { /* (7) */
1742 static_route = (ln->la_flags & LLE_STATIC);
1743 router = ln->ln_router;
1745 if (flags & ND6_EXCLUSIVE)
1753 nd6_output_flush(ifp, ifp, chain, &sin6, NULL);
1756 * When the link-layer address of a router changes, select the
1757 * best router again. In particular, when the neighbor entry is newly
1758 * created, it might affect the selection policy.
1759 * Question: can we restrict the first condition to the "is_newentry"
1761 * XXX: when we hear an RA from a new router with the link-layer
1762 * address option, defrouter_select() is called twice, since
1763 * defrtrlist_update called the function as well. However, I believe
1764 * we can compromise the overhead, since it only happens the first
1766 * XXX: although defrouter_select() should not have a bad effect
1767 * for those are not autoconfigured hosts, we explicitly avoid such
1770 if (do_update && router &&
1771 ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV) {
1773 * guaranteed recursion
1781 if (flags & ND6_EXCLUSIVE)
1792 nd6_slowtimo(void *arg)
1794 CURVNET_SET((struct vnet *) arg);
1795 struct nd_ifinfo *nd6if;
1798 callout_reset(&V_nd6_slowtimo_ch, ND6_SLOWTIMER_INTERVAL * hz,
1799 nd6_slowtimo, curvnet);
1800 IFNET_RLOCK_NOSLEEP();
1801 TAILQ_FOREACH(ifp, &V_ifnet, if_list) {
1802 nd6if = ND_IFINFO(ifp);
1803 if (nd6if->basereachable && /* already initialized */
1804 (nd6if->recalctm -= ND6_SLOWTIMER_INTERVAL) <= 0) {
1806 * Since reachable time rarely changes by router
1807 * advertisements, we SHOULD insure that a new random
1808 * value gets recomputed at least once every few hours.
1811 nd6if->recalctm = V_nd6_recalc_reachtm_interval;
1812 nd6if->reachable = ND_COMPUTE_RTIME(nd6if->basereachable);
1815 IFNET_RUNLOCK_NOSLEEP();
1820 nd6_output(struct ifnet *ifp, struct ifnet *origifp, struct mbuf *m0,
1821 struct sockaddr_in6 *dst, struct rtentry *rt0)
1824 return (nd6_output_lle(ifp, origifp, m0, dst, rt0, NULL, NULL));
1829 * Note that I'm not enforcing any global serialization
1830 * lle state or asked changes here as the logic is too
1831 * complicated to avoid having to always acquire an exclusive
1836 #define senderr(e) { error = (e); goto bad;}
1839 nd6_output_lle(struct ifnet *ifp, struct ifnet *origifp, struct mbuf *m0,
1840 struct sockaddr_in6 *dst, struct rtentry *rt0, struct llentry *lle,
1841 struct mbuf **chain)
1843 struct mbuf *m = m0;
1845 struct llentry *ln = lle;
1846 struct ip6_hdr *ip6;
1854 LLE_WLOCK_ASSERT(lle);
1856 KASSERT(chain != NULL, (" lle locked but no mbuf chain pointer passed"));
1859 if (IN6_IS_ADDR_MULTICAST(&dst->sin6_addr))
1862 if (nd6_need_cache(ifp) == 0)
1866 * next hop determination. This routine is derived from ether_output.
1870 * Address resolution or Neighbor Unreachability Detection
1872 * At this point, the destination of the packet must be a unicast
1873 * or an anycast address(i.e. not a multicast).
1876 flags = ((m != NULL) || (lle != NULL)) ? LLE_EXCLUSIVE : 0;
1879 IF_AFDATA_LOCK(ifp);
1880 ln = lla_lookup(LLTABLE6(ifp), flags, (struct sockaddr *)dst);
1881 IF_AFDATA_UNLOCK(ifp);
1882 if ((ln == NULL) && nd6_is_addr_neighbor(dst, ifp)) {
1884 * Since nd6_is_addr_neighbor() internally calls nd6_lookup(),
1885 * the condition below is not very efficient. But we believe
1886 * it is tolerable, because this should be a rare case.
1888 flags = ND6_CREATE | (m ? ND6_EXCLUSIVE : 0);
1889 IF_AFDATA_LOCK(ifp);
1890 ln = nd6_lookup(&dst->sin6_addr, flags, ifp);
1891 IF_AFDATA_UNLOCK(ifp);
1895 if ((ifp->if_flags & IFF_POINTOPOINT) == 0 &&
1896 !(ND_IFINFO(ifp)->flags & ND6_IFF_PERFORMNUD)) {
1897 char ip6buf[INET6_ADDRSTRLEN];
1899 "nd6_output: can't allocate llinfo for %s "
1901 ip6_sprintf(ip6buf, &dst->sin6_addr), ln);
1902 senderr(EIO); /* XXX: good error? */
1904 goto sendpkt; /* send anyway */
1907 /* We don't have to do link-layer address resolution on a p2p link. */
1908 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 &&
1909 ln->ln_state < ND6_LLINFO_REACHABLE) {
1910 if ((flags & LLE_EXCLUSIVE) == 0) {
1911 flags |= LLE_EXCLUSIVE;
1914 ln->ln_state = ND6_LLINFO_STALE;
1915 nd6_llinfo_settimer_locked(ln, (long)V_nd6_gctimer * hz);
1919 * The first time we send a packet to a neighbor whose entry is
1920 * STALE, we have to change the state to DELAY and a sets a timer to
1921 * expire in DELAY_FIRST_PROBE_TIME seconds to ensure do
1922 * neighbor unreachability detection on expiration.
1925 if (ln->ln_state == ND6_LLINFO_STALE) {
1926 if ((flags & LLE_EXCLUSIVE) == 0) {
1927 flags |= LLE_EXCLUSIVE;
1932 ln->ln_state = ND6_LLINFO_DELAY;
1933 nd6_llinfo_settimer_locked(ln, (long)V_nd6_delay * hz);
1937 * If the neighbor cache entry has a state other than INCOMPLETE
1938 * (i.e. its link-layer address is already resolved), just
1941 if (ln->ln_state > ND6_LLINFO_INCOMPLETE)
1945 * There is a neighbor cache entry, but no ethernet address
1946 * response yet. Append this latest packet to the end of the
1947 * packet queue in the mbuf, unless the number of the packet
1948 * does not exceed nd6_maxqueuelen. When it exceeds nd6_maxqueuelen,
1949 * the oldest packet in the queue will be removed.
1951 if (ln->ln_state == ND6_LLINFO_NOSTATE)
1952 ln->ln_state = ND6_LLINFO_INCOMPLETE;
1954 if ((flags & LLE_EXCLUSIVE) == 0) {
1955 flags |= LLE_EXCLUSIVE;
1960 LLE_WLOCK_ASSERT(ln);
1963 struct mbuf *m_hold;
1967 for (m_hold = ln->la_hold; m_hold; m_hold = m_hold->m_nextpkt) {
1969 if (m_hold->m_nextpkt == NULL) {
1970 m_hold->m_nextpkt = m;
1974 while (i >= V_nd6_maxqueuelen) {
1975 m_hold = ln->la_hold;
1976 ln->la_hold = ln->la_hold->m_nextpkt;
1985 * If there has been no NS for the neighbor after entering the
1986 * INCOMPLETE state, send the first solicitation.
1988 if (!ND6_LLINFO_PERMANENT(ln) && ln->la_asked == 0) {
1991 nd6_llinfo_settimer_locked(ln,
1992 (long)ND_IFINFO(ifp)->retrans * hz / 1000);
1994 nd6_ns_output(ifp, NULL, &dst->sin6_addr, ln, 0);
1995 if (lle != NULL && ln == lle)
1998 } else if (lle == NULL || ln != lle) {
2000 * We did the lookup (no lle arg) so we
2001 * need to do the unlock here.
2009 /* discard the packet if IPv6 operation is disabled on the interface */
2010 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)) {
2011 error = ENETDOWN; /* better error? */
2015 * ln is valid and the caller did not pass in
2018 if ((ln != NULL) && (lle == NULL)) {
2019 if (flags & LLE_EXCLUSIVE)
2026 mac_netinet6_nd6_send(ifp, m);
2030 * If called from nd6_ns_output() (NS), nd6_na_output() (NA),
2031 * icmp6_redirect_output() (REDIRECT) or from rip6_output() (RS, RA
2032 * as handled by rtsol and rtadvd), mbufs will be tagged for SeND
2033 * to be diverted to user space. When re-injected into the kernel,
2034 * send_output() will directly dispatch them to the outgoing interface.
2036 if (send_sendso_input_hook != NULL) {
2037 mtag = m_tag_find(m, PACKET_TAG_ND_OUTGOING, NULL);
2039 ip6 = mtod(m, struct ip6_hdr *);
2040 ip6len = sizeof(struct ip6_hdr) + ntohs(ip6->ip6_plen);
2041 /* Use the SEND socket */
2042 error = send_sendso_input_hook(m, ifp, SND_OUT,
2044 /* -1 == no app on SEND socket */
2045 if (error == 0 || error != -1)
2051 * We were passed in a pointer to an lle with the lock held
2052 * this means that we can't call if_output as we will
2053 * recurse on the lle lock - so what we do is we create
2054 * a list of mbufs to send and transmit them in the caller
2055 * after the lock is dropped
2064 * append mbuf to end of deferred chain
2067 while (mb->m_nextpkt != NULL)
2073 /* Reset layer specific mbuf flags to avoid confusing lower layers. */
2074 m->m_flags &= ~(M_PROTOFLAGS);
2075 if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
2076 return ((*ifp->if_output)(origifp, m, (struct sockaddr *)dst,
2079 error = (*ifp->if_output)(ifp, m, (struct sockaddr *)dst, NULL);
2084 * ln is valid and the caller did not pass in
2087 if ((ln != NULL) && (lle == NULL)) {
2088 if (flags & LLE_EXCLUSIVE)
2101 nd6_output_flush(struct ifnet *ifp, struct ifnet *origifp, struct mbuf *chain,
2102 struct sockaddr_in6 *dst, struct route *ro)
2104 struct mbuf *m, *m_head;
2105 struct ifnet *outifp;
2109 if ((ifp->if_flags & IFF_LOOPBACK) != 0)
2116 m_head = m_head->m_nextpkt;
2117 error = (*ifp->if_output)(ifp, m, (struct sockaddr *)dst, ro);
2122 * note that intermediate errors are blindly ignored - but this is
2123 * the same convention as used with nd6_output when called by
2131 nd6_need_cache(struct ifnet *ifp)
2134 * XXX: we currently do not make neighbor cache on any interface
2135 * other than ARCnet, Ethernet, FDDI and GIF.
2138 * - unidirectional tunnels needs no ND
2140 switch (ifp->if_type) {
2148 #ifdef IFT_IEEE80211
2151 case IFT_INFINIBAND:
2152 case IFT_GIF: /* XXX need more cases? */
2156 case IFT_PROPVIRTUAL:
2164 * the callers of this function need to be re-worked to drop
2165 * the lle lock, drop here for now
2168 nd6_storelladdr(struct ifnet *ifp, struct mbuf *m,
2169 struct sockaddr *dst, u_char *desten, struct llentry **lle)
2174 IF_AFDATA_UNLOCK_ASSERT(ifp);
2175 if (m->m_flags & M_MCAST) {
2178 switch (ifp->if_type) {
2184 #ifdef IFT_IEEE80211
2189 ETHER_MAP_IPV6_MULTICAST(&SIN6(dst)->sin6_addr,
2194 * netbsd can use if_broadcastaddr, but we don't do so
2195 * to reduce # of ifdef.
2197 for (i = 0; i < ifp->if_addrlen; i++)
2205 return (EAFNOSUPPORT);
2211 * the entry should have been created in nd6_store_lladdr
2213 IF_AFDATA_LOCK(ifp);
2214 ln = lla_lookup(LLTABLE6(ifp), 0, dst);
2215 IF_AFDATA_UNLOCK(ifp);
2216 if ((ln == NULL) || !(ln->la_flags & LLE_VALID)) {
2219 /* this could happen, if we could not allocate memory */
2224 bcopy(&ln->ll_addr, desten, ifp->if_addrlen);
2228 * A *small* use after free race exists here
2234 clear_llinfo_pqueue(struct llentry *ln)
2236 struct mbuf *m_hold, *m_hold_next;
2238 for (m_hold = ln->la_hold; m_hold; m_hold = m_hold_next) {
2239 m_hold_next = m_hold->m_nextpkt;
2247 static int nd6_sysctl_drlist(SYSCTL_HANDLER_ARGS);
2248 static int nd6_sysctl_prlist(SYSCTL_HANDLER_ARGS);
2250 SYSCTL_DECL(_net_inet6_icmp6);
2252 SYSCTL_NODE(_net_inet6_icmp6, ICMPV6CTL_ND6_DRLIST, nd6_drlist,
2253 CTLFLAG_RD, nd6_sysctl_drlist, "");
2254 SYSCTL_NODE(_net_inet6_icmp6, ICMPV6CTL_ND6_PRLIST, nd6_prlist,
2255 CTLFLAG_RD, nd6_sysctl_prlist, "");
2256 SYSCTL_VNET_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_MAXQLEN, nd6_maxqueuelen,
2257 CTLFLAG_RW, &VNET_NAME(nd6_maxqueuelen), 1, "");
2260 nd6_sysctl_drlist(SYSCTL_HANDLER_ARGS)
2262 struct in6_defrouter d;
2263 struct nd_defrouter *dr;
2269 bzero(&d, sizeof(d));
2270 d.rtaddr.sin6_family = AF_INET6;
2271 d.rtaddr.sin6_len = sizeof(d.rtaddr);
2276 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) {
2277 d.rtaddr.sin6_addr = dr->rtaddr;
2278 error = sa6_recoverscope(&d.rtaddr);
2281 d.flags = dr->flags;
2282 d.rtlifetime = dr->rtlifetime;
2283 d.expire = dr->expire;
2284 d.if_index = dr->ifp->if_index;
2285 error = SYSCTL_OUT(req, &d, sizeof(d));
2293 nd6_sysctl_prlist(SYSCTL_HANDLER_ARGS)
2295 struct in6_prefix p;
2296 struct sockaddr_in6 s6;
2297 struct nd_prefix *pr;
2298 struct nd_pfxrouter *pfr;
2301 char ip6buf[INET6_ADDRSTRLEN];
2306 bzero(&p, sizeof(p));
2307 p.origin = PR_ORIG_RA;
2308 bzero(&s6, sizeof(s6));
2309 s6.sin6_family = AF_INET6;
2310 s6.sin6_len = sizeof(s6);
2315 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
2316 p.prefix = pr->ndpr_prefix;
2317 if (sa6_recoverscope(&p.prefix)) {
2318 log(LOG_ERR, "scope error in prefix list (%s)\n",
2319 ip6_sprintf(ip6buf, &p.prefix.sin6_addr));
2320 /* XXX: press on... */
2322 p.raflags = pr->ndpr_raf;
2323 p.prefixlen = pr->ndpr_plen;
2324 p.vltime = pr->ndpr_vltime;
2325 p.pltime = pr->ndpr_pltime;
2326 p.if_index = pr->ndpr_ifp->if_index;
2327 if (pr->ndpr_vltime == ND6_INFINITE_LIFETIME)
2330 /* XXX: we assume time_t is signed. */
2332 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
2333 if (pr->ndpr_vltime < maxexpire - pr->ndpr_lastupdate)
2334 p.expire = pr->ndpr_lastupdate +
2337 p.expire = maxexpire;
2339 p.refcnt = pr->ndpr_refcnt;
2340 p.flags = pr->ndpr_stateflags;
2342 LIST_FOREACH(pfr, &pr->ndpr_advrtrs, pfr_entry)
2344 error = SYSCTL_OUT(req, &p, sizeof(p));
2347 LIST_FOREACH(pfr, &pr->ndpr_advrtrs, pfr_entry) {
2348 s6.sin6_addr = pfr->router->rtaddr;
2349 if (sa6_recoverscope(&s6))
2351 "scope error in prefix list (%s)\n",
2352 ip6_sprintf(ip6buf, &pfr->router->rtaddr));
2353 error = SYSCTL_OUT(req, &s6, sizeof(s6));