2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the project nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * $KAME: nd6.c,v 1.144 2001/05/24 07:44:00 itojun Exp $
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
38 #include "opt_inet6.h"
39 #include "opt_route.h"
41 #include <sys/param.h>
42 #include <sys/systm.h>
43 #include <sys/eventhandler.h>
44 #include <sys/callout.h>
46 #include <sys/malloc.h>
48 #include <sys/mutex.h>
49 #include <sys/socket.h>
50 #include <sys/sockio.h>
52 #include <sys/kernel.h>
53 #include <sys/protosw.h>
54 #include <sys/errno.h>
55 #include <sys/syslog.h>
56 #include <sys/rwlock.h>
57 #include <sys/queue.h>
59 #include <sys/sysctl.h>
62 #include <net/if_var.h>
63 #include <net/if_dl.h>
64 #include <net/if_types.h>
65 #include <net/route.h>
66 #include <net/route/route_ctl.h>
67 #include <net/route/nhop.h>
70 #include <netinet/in.h>
71 #include <netinet/in_kdtrace.h>
72 #include <net/if_llatbl.h>
73 #include <netinet/if_ether.h>
74 #include <netinet6/in6_var.h>
75 #include <netinet/ip6.h>
76 #include <netinet6/ip6_var.h>
77 #include <netinet6/scope6_var.h>
78 #include <netinet6/nd6.h>
79 #include <netinet6/in6_ifattach.h>
80 #include <netinet/icmp6.h>
81 #include <netinet6/send.h>
83 #include <sys/limits.h>
85 #include <security/mac/mac_framework.h>
87 #define ND6_SLOWTIMER_INTERVAL (60 * 60) /* 1 hour */
88 #define ND6_RECALC_REACHTM_INTERVAL (60 * 120) /* 2 hours */
90 #define SIN6(s) ((const struct sockaddr_in6 *)(s))
92 MALLOC_DEFINE(M_IP6NDP, "ip6ndp", "IPv6 Neighbor Discovery");
95 VNET_DEFINE(int, nd6_prune) = 1; /* walk list every 1 seconds */
96 VNET_DEFINE(int, nd6_delay) = 5; /* delay first probe time 5 second */
97 VNET_DEFINE(int, nd6_umaxtries) = 3; /* maximum unicast query */
98 VNET_DEFINE(int, nd6_mmaxtries) = 3; /* maximum multicast query */
99 VNET_DEFINE(int, nd6_useloopback) = 1; /* use loopback interface for
101 VNET_DEFINE(int, nd6_gctimer) = (60 * 60 * 24); /* 1 day: garbage
102 * collection timer */
104 /* preventing too many loops in ND option parsing */
105 VNET_DEFINE_STATIC(int, nd6_maxndopt) = 10; /* max # of ND options allowed */
107 VNET_DEFINE(int, nd6_maxnudhint) = 0; /* max # of subsequent upper
109 VNET_DEFINE_STATIC(int, nd6_maxqueuelen) = 16; /* max pkts cached in unresolved
111 #define V_nd6_maxndopt VNET(nd6_maxndopt)
112 #define V_nd6_maxqueuelen VNET(nd6_maxqueuelen)
115 VNET_DEFINE(int, nd6_debug) = 1;
117 VNET_DEFINE(int, nd6_debug) = 0;
120 static eventhandler_tag lle_event_eh, iflladdr_event_eh, ifnet_link_event_eh;
122 VNET_DEFINE(struct nd_prhead, nd_prefix);
123 VNET_DEFINE(struct rwlock, nd6_lock);
124 VNET_DEFINE(uint64_t, nd6_list_genid);
125 VNET_DEFINE(struct mtx, nd6_onlink_mtx);
127 VNET_DEFINE(int, nd6_recalc_reachtm_interval) = ND6_RECALC_REACHTM_INTERVAL;
128 #define V_nd6_recalc_reachtm_interval VNET(nd6_recalc_reachtm_interval)
130 int (*send_sendso_input_hook)(struct mbuf *, struct ifnet *, int, int);
132 static int nd6_is_new_addr_neighbor(const struct sockaddr_in6 *,
134 static void nd6_setmtu0(struct ifnet *, struct nd_ifinfo *);
135 static void nd6_slowtimo(void *);
136 static int regen_tmpaddr(struct in6_ifaddr *);
137 static void nd6_free(struct llentry **, int);
138 static void nd6_free_redirect(const struct llentry *);
139 static void nd6_llinfo_timer(void *);
140 static void nd6_llinfo_settimer_locked(struct llentry *, long);
141 static void clear_llinfo_pqueue(struct llentry *);
142 static int nd6_resolve_slow(struct ifnet *, int, int, struct mbuf *,
143 const struct sockaddr_in6 *, u_char *, uint32_t *, struct llentry **);
144 static int nd6_need_cache(struct ifnet *);
146 VNET_DEFINE_STATIC(struct callout, nd6_slowtimo_ch);
147 #define V_nd6_slowtimo_ch VNET(nd6_slowtimo_ch)
149 VNET_DEFINE_STATIC(struct callout, nd6_timer_ch);
150 #define V_nd6_timer_ch VNET(nd6_timer_ch)
152 SYSCTL_DECL(_net_inet6_icmp6);
155 nd6_lle_event(void *arg __unused, struct llentry *lle, int evt)
157 struct rt_addrinfo rtinfo;
158 struct sockaddr_in6 dst;
159 struct sockaddr_dl gw;
164 LLE_WLOCK_ASSERT(lle);
166 if (lltable_get_af(lle->lle_tbl) != AF_INET6)
170 case LLENTRY_RESOLVED:
172 KASSERT(lle->la_flags & LLE_VALID,
173 ("%s: %p resolved but not valid?", __func__, lle));
175 case LLENTRY_EXPIRED:
182 ifp = lltable_get_ifp(lle->lle_tbl);
184 bzero(&dst, sizeof(dst));
185 bzero(&gw, sizeof(gw));
186 bzero(&rtinfo, sizeof(rtinfo));
187 lltable_fill_sa_entry(lle, (struct sockaddr *)&dst);
188 dst.sin6_scope_id = in6_getscopezone(ifp,
189 in6_addrscope(&dst.sin6_addr));
190 gw.sdl_len = sizeof(struct sockaddr_dl);
191 gw.sdl_family = AF_LINK;
192 gw.sdl_alen = ifp->if_addrlen;
193 gw.sdl_index = ifp->if_index;
194 gw.sdl_type = ifp->if_type;
195 if (evt == LLENTRY_RESOLVED)
196 bcopy(lle->ll_addr, gw.sdl_data, ifp->if_addrlen);
197 rtinfo.rti_info[RTAX_DST] = (struct sockaddr *)&dst;
198 rtinfo.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&gw;
199 rtinfo.rti_addrs = RTA_DST | RTA_GATEWAY;
200 fibnum = V_rt_add_addr_allfibs ? RT_ALL_FIBS : ifp->if_fib;
201 rt_missmsg_fib(type, &rtinfo, RTF_HOST | RTF_LLDATA | (
202 type == RTM_ADD ? RTF_UP: 0), 0, fibnum);
206 * A handler for interface link layer address change event.
209 nd6_iflladdr(void *arg __unused, struct ifnet *ifp)
211 if (ifp->if_afdata[AF_INET6] == NULL)
214 lltable_update_ifaddr(LLTABLE6(ifp));
221 mtx_init(&V_nd6_onlink_mtx, "nd6 onlink", NULL, MTX_DEF);
222 rw_init(&V_nd6_lock, "nd6 list");
224 LIST_INIT(&V_nd_prefix);
225 nd6_defrouter_init();
228 callout_init(&V_nd6_slowtimo_ch, 1);
229 callout_reset(&V_nd6_slowtimo_ch, ND6_SLOWTIMER_INTERVAL * hz,
230 nd6_slowtimo, curvnet);
232 callout_init(&V_nd6_timer_ch, 1);
233 callout_reset(&V_nd6_timer_ch, hz, nd6_timer, curvnet);
236 if (IS_DEFAULT_VNET(curvnet)) {
237 lle_event_eh = EVENTHANDLER_REGISTER(lle_event, nd6_lle_event,
238 NULL, EVENTHANDLER_PRI_ANY);
239 iflladdr_event_eh = EVENTHANDLER_REGISTER(iflladdr_event,
240 nd6_iflladdr, NULL, EVENTHANDLER_PRI_ANY);
241 ifnet_link_event_eh = EVENTHANDLER_REGISTER(ifnet_link_event,
242 nd6_ifnet_link_event, NULL, EVENTHANDLER_PRI_ANY);
251 callout_drain(&V_nd6_slowtimo_ch);
252 callout_drain(&V_nd6_timer_ch);
253 if (IS_DEFAULT_VNET(curvnet)) {
254 EVENTHANDLER_DEREGISTER(ifnet_link_event, ifnet_link_event_eh);
255 EVENTHANDLER_DEREGISTER(lle_event, lle_event_eh);
256 EVENTHANDLER_DEREGISTER(iflladdr_event, iflladdr_event_eh);
258 rw_destroy(&V_nd6_lock);
259 mtx_destroy(&V_nd6_onlink_mtx);
264 nd6_ifattach(struct ifnet *ifp)
266 struct nd_ifinfo *nd;
268 nd = malloc(sizeof(*nd), M_IP6NDP, M_WAITOK | M_ZERO);
271 nd->chlim = IPV6_DEFHLIM;
272 nd->basereachable = REACHABLE_TIME;
273 nd->reachable = ND_COMPUTE_RTIME(nd->basereachable);
274 nd->retrans = RETRANS_TIMER;
276 nd->flags = ND6_IFF_PERFORMNUD;
278 /* Set IPv6 disabled on all interfaces but loopback by default. */
279 if ((ifp->if_flags & IFF_LOOPBACK) == 0)
280 nd->flags |= ND6_IFF_IFDISABLED;
282 /* A loopback interface always has ND6_IFF_AUTO_LINKLOCAL.
283 * XXXHRS: Clear ND6_IFF_AUTO_LINKLOCAL on an IFT_BRIDGE interface by
284 * default regardless of the V_ip6_auto_linklocal configuration to
285 * give a reasonable default behavior.
287 if ((V_ip6_auto_linklocal && ifp->if_type != IFT_BRIDGE) ||
288 (ifp->if_flags & IFF_LOOPBACK))
289 nd->flags |= ND6_IFF_AUTO_LINKLOCAL;
291 * A loopback interface does not need to accept RTADV.
292 * XXXHRS: Clear ND6_IFF_ACCEPT_RTADV on an IFT_BRIDGE interface by
293 * default regardless of the V_ip6_accept_rtadv configuration to
294 * prevent the interface from accepting RA messages arrived
295 * on one of the member interfaces with ND6_IFF_ACCEPT_RTADV.
297 if (V_ip6_accept_rtadv &&
298 !(ifp->if_flags & IFF_LOOPBACK) &&
299 (ifp->if_type != IFT_BRIDGE)) {
300 nd->flags |= ND6_IFF_ACCEPT_RTADV;
301 /* If we globally accept rtadv, assume IPv6 on. */
302 nd->flags &= ~ND6_IFF_IFDISABLED;
304 if (V_ip6_no_radr && !(ifp->if_flags & IFF_LOOPBACK))
305 nd->flags |= ND6_IFF_NO_RADR;
307 /* XXX: we cannot call nd6_setmtu since ifp is not fully initialized */
308 nd6_setmtu0(ifp, nd);
314 nd6_ifdetach(struct ifnet *ifp, struct nd_ifinfo *nd)
316 struct epoch_tracker et;
317 struct ifaddr *ifa, *next;
320 CK_STAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) {
321 if (ifa->ifa_addr->sa_family != AF_INET6)
324 /* stop DAD processing */
333 * Reset ND level link MTU. This function is called when the physical MTU
334 * changes, which means we might have to adjust the ND level MTU.
337 nd6_setmtu(struct ifnet *ifp)
339 if (ifp->if_afdata[AF_INET6] == NULL)
342 nd6_setmtu0(ifp, ND_IFINFO(ifp));
345 /* XXX todo: do not maintain copy of ifp->if_mtu in ndi->maxmtu */
347 nd6_setmtu0(struct ifnet *ifp, struct nd_ifinfo *ndi)
351 omaxmtu = ndi->maxmtu;
352 ndi->maxmtu = ifp->if_mtu;
355 * Decreasing the interface MTU under IPV6 minimum MTU may cause
356 * undesirable situation. We thus notify the operator of the change
357 * explicitly. The check for omaxmtu is necessary to restrict the
358 * log to the case of changing the MTU, not initializing it.
360 if (omaxmtu >= IPV6_MMTU && ndi->maxmtu < IPV6_MMTU) {
361 log(LOG_NOTICE, "nd6_setmtu0: "
362 "new link MTU on %s (%lu) is too small for IPv6\n",
363 if_name(ifp), (unsigned long)ndi->maxmtu);
366 if (ndi->maxmtu > V_in6_maxmtu)
367 in6_setmaxmtu(); /* check all interfaces just in case */
372 nd6_option_init(void *opt, int icmp6len, union nd_opts *ndopts)
375 bzero(ndopts, sizeof(*ndopts));
376 ndopts->nd_opts_search = (struct nd_opt_hdr *)opt;
378 = (struct nd_opt_hdr *)(((u_char *)opt) + icmp6len);
381 ndopts->nd_opts_done = 1;
382 ndopts->nd_opts_search = NULL;
387 * Take one ND option.
390 nd6_option(union nd_opts *ndopts)
392 struct nd_opt_hdr *nd_opt;
395 KASSERT(ndopts != NULL, ("%s: ndopts == NULL", __func__));
396 KASSERT(ndopts->nd_opts_last != NULL, ("%s: uninitialized ndopts",
398 if (ndopts->nd_opts_search == NULL)
400 if (ndopts->nd_opts_done)
403 nd_opt = ndopts->nd_opts_search;
405 /* make sure nd_opt_len is inside the buffer */
406 if ((caddr_t)&nd_opt->nd_opt_len >= (caddr_t)ndopts->nd_opts_last) {
407 bzero(ndopts, sizeof(*ndopts));
411 olen = nd_opt->nd_opt_len << 3;
414 * Message validation requires that all included
415 * options have a length that is greater than zero.
417 bzero(ndopts, sizeof(*ndopts));
421 ndopts->nd_opts_search = (struct nd_opt_hdr *)((caddr_t)nd_opt + olen);
422 if (ndopts->nd_opts_search > ndopts->nd_opts_last) {
423 /* option overruns the end of buffer, invalid */
424 bzero(ndopts, sizeof(*ndopts));
426 } else if (ndopts->nd_opts_search == ndopts->nd_opts_last) {
427 /* reached the end of options chain */
428 ndopts->nd_opts_done = 1;
429 ndopts->nd_opts_search = NULL;
435 * Parse multiple ND options.
436 * This function is much easier to use, for ND routines that do not need
437 * multiple options of the same type.
440 nd6_options(union nd_opts *ndopts)
442 struct nd_opt_hdr *nd_opt;
445 KASSERT(ndopts != NULL, ("%s: ndopts == NULL", __func__));
446 KASSERT(ndopts->nd_opts_last != NULL, ("%s: uninitialized ndopts",
448 if (ndopts->nd_opts_search == NULL)
452 nd_opt = nd6_option(ndopts);
453 if (nd_opt == NULL && ndopts->nd_opts_last == NULL) {
455 * Message validation requires that all included
456 * options have a length that is greater than zero.
458 ICMP6STAT_INC(icp6s_nd_badopt);
459 bzero(ndopts, sizeof(*ndopts));
466 switch (nd_opt->nd_opt_type) {
467 case ND_OPT_SOURCE_LINKADDR:
468 case ND_OPT_TARGET_LINKADDR:
470 case ND_OPT_REDIRECTED_HEADER:
472 if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) {
474 "duplicated ND6 option found (type=%d)\n",
475 nd_opt->nd_opt_type));
478 ndopts->nd_opt_array[nd_opt->nd_opt_type]
482 case ND_OPT_PREFIX_INFORMATION:
483 if (ndopts->nd_opt_array[nd_opt->nd_opt_type] == 0) {
484 ndopts->nd_opt_array[nd_opt->nd_opt_type]
487 ndopts->nd_opts_pi_end =
488 (struct nd_opt_prefix_info *)nd_opt;
490 /* What about ND_OPT_ROUTE_INFO? RFC 4191 */
491 case ND_OPT_RDNSS: /* RFC 6106 */
492 case ND_OPT_DNSSL: /* RFC 6106 */
494 * Silently ignore options we know and do not care about
500 * Unknown options must be silently ignored,
501 * to accommodate future extension to the protocol.
504 "nd6_options: unsupported option %d - "
505 "option ignored\n", nd_opt->nd_opt_type));
510 if (i > V_nd6_maxndopt) {
511 ICMP6STAT_INC(icp6s_nd_toomanyopt);
512 nd6log((LOG_INFO, "too many loop in nd opt\n"));
516 if (ndopts->nd_opts_done)
524 * ND6 timer routine to handle ND6 entries
527 nd6_llinfo_settimer_locked(struct llentry *ln, long tick)
531 LLE_WLOCK_ASSERT(ln);
533 /* Do not schedule timers for child LLEs. */
534 if (ln->la_flags & LLE_CHILD)
540 canceled = callout_stop(&ln->lle_timer);
542 ln->la_expire = time_uptime + tick / hz;
544 if (tick > INT_MAX) {
545 ln->ln_ntick = tick - INT_MAX;
546 canceled = callout_reset(&ln->lle_timer, INT_MAX,
547 nd6_llinfo_timer, ln);
550 canceled = callout_reset(&ln->lle_timer, tick,
551 nd6_llinfo_timer, ln);
559 * Gets source address of the first packet in hold queue
560 * and stores it in @src.
561 * Returns pointer to @src (if hold queue is not empty) or NULL.
563 * Set noinline to be dtrace-friendly
565 static __noinline struct in6_addr *
566 nd6_llinfo_get_holdsrc(struct llentry *ln, struct in6_addr *src)
571 if (ln->la_hold == NULL)
575 * assume every packet in la_hold has the same IP header
578 if (sizeof(hdr) > m->m_len)
581 m_copydata(m, 0, sizeof(hdr), (caddr_t)&hdr);
588 * Checks if we need to switch from STALE state.
590 * RFC 4861 requires switching from STALE to DELAY state
591 * on first packet matching entry, waiting V_nd6_delay and
592 * transition to PROBE state (if upper layer confirmation was
595 * This code performs a bit differently:
596 * On packet hit we don't change state (but desired state
597 * can be guessed by control plane). However, after V_nd6_delay
598 * seconds code will transition to PROBE state (so DELAY state
599 * is kinda skipped in most situations).
601 * Typically, V_nd6_gctimer is bigger than V_nd6_delay, so
602 * we perform the following upon entering STALE state:
604 * 1) Arm timer to run each V_nd6_delay seconds to make sure that
605 * if packet was transmitted at the start of given interval, we
606 * would be able to switch to PROBE state in V_nd6_delay seconds
609 * 2) Reschedule timer until original V_nd6_gctimer expires keeping
610 * lle in STALE state (remaining timer value stored in lle_remtime).
612 * 3) Reschedule timer if packet was transmitted less that V_nd6_delay
615 * Returns non-zero value if the entry is still STALE (storing
616 * the next timer interval in @pdelay).
618 * Returns zero value if original timer expired or we need to switch to
619 * PROBE (store that in @do_switch variable).
622 nd6_is_stale(struct llentry *lle, long *pdelay, int *do_switch)
624 int nd_delay, nd_gctimer;
629 nd_gctimer = V_nd6_gctimer;
630 nd_delay = V_nd6_delay;
632 lle_hittime = llentry_get_hittime(lle);
634 if (lle_hittime == 0) {
636 * Datapath feedback has been requested upon entering
637 * STALE state. No packets has been passed using this lle.
638 * Ask for the timer reschedule and keep STALE state.
640 delay = (long)(MIN(nd_gctimer, nd_delay));
642 if (lle->lle_remtime > delay)
643 lle->lle_remtime -= delay;
645 delay = lle->lle_remtime;
646 lle->lle_remtime = 0;
651 * The original ng6_gctime timeout ended,
652 * no more rescheduling.
662 * Packet received. Verify timestamp
664 delay = (long)(time_uptime - lle_hittime);
665 if (delay < nd_delay) {
667 * V_nd6_delay still not passed since the first
668 * hit in STALE state.
669 * Reschedule timer and return.
671 *pdelay = (long)(nd_delay - delay) * hz;
675 /* Request switching to probe */
681 * Switch @lle state to new state optionally arming timers.
683 * Set noinline to be dtrace-friendly
686 nd6_llinfo_setstate(struct llentry *lle, int newstate)
689 int nd_gctimer, nd_delay;
696 case ND6_LLINFO_INCOMPLETE:
697 ifp = lle->lle_tbl->llt_ifp;
698 delay = (long)ND_IFINFO(ifp)->retrans * hz / 1000;
700 case ND6_LLINFO_REACHABLE:
701 if (!ND6_LLINFO_PERMANENT(lle)) {
702 ifp = lle->lle_tbl->llt_ifp;
703 delay = (long)ND_IFINFO(ifp)->reachable * hz;
706 case ND6_LLINFO_STALE:
708 llentry_request_feedback(lle);
709 nd_delay = V_nd6_delay;
710 nd_gctimer = V_nd6_gctimer;
712 delay = (long)(MIN(nd_gctimer, nd_delay)) * hz;
713 remtime = (long)nd_gctimer * hz - delay;
715 case ND6_LLINFO_DELAY:
717 delay = (long)V_nd6_delay * hz;
722 nd6_llinfo_settimer_locked(lle, delay);
724 lle->lle_remtime = remtime;
725 lle->ln_state = newstate;
729 * Timer-dependent part of nd state machine.
731 * Set noinline to be dtrace-friendly
733 static __noinline void
734 nd6_llinfo_timer(void *arg)
736 struct epoch_tracker et;
738 struct in6_addr *dst, *pdst, *psrc, src;
740 struct nd_ifinfo *ndi;
741 int do_switch, send_ns;
744 KASSERT(arg != NULL, ("%s: arg NULL", __func__));
745 ln = (struct llentry *)arg;
746 ifp = lltable_get_ifp(ln->lle_tbl);
747 CURVNET_SET(ifp->if_vnet);
751 if (callout_pending(&ln->lle_timer)) {
753 * Here we are a bit odd here in the treatment of
754 * active/pending. If the pending bit is set, it got
755 * rescheduled before I ran. The active
756 * bit we ignore, since if it was stopped
757 * in ll_tablefree() and was currently running
758 * it would have return 0 so the code would
759 * not have deleted it since the callout could
760 * not be stopped so we want to go through
761 * with the delete here now. If the callout
762 * was restarted, the pending bit will be back on and
763 * we just want to bail since the callout_reset would
764 * return 1 and our reference would have been removed
765 * by nd6_llinfo_settimer_locked above since canceled
774 ndi = ND_IFINFO(ifp);
776 dst = &ln->r_l3addr.addr6;
779 if (ln->ln_ntick > 0) {
780 if (ln->ln_ntick > INT_MAX) {
781 ln->ln_ntick -= INT_MAX;
782 nd6_llinfo_settimer_locked(ln, INT_MAX);
785 nd6_llinfo_settimer_locked(ln, ln->ln_ntick);
790 if (ln->la_flags & LLE_STATIC) {
794 if (ln->la_flags & LLE_DELETED) {
799 switch (ln->ln_state) {
800 case ND6_LLINFO_INCOMPLETE:
801 if (ln->la_asked < V_nd6_mmaxtries) {
804 /* Send NS to multicast address */
807 struct mbuf *m = ln->la_hold;
812 * assuming every packet in la_hold has the
813 * same IP header. Send error after unlock.
818 clear_llinfo_pqueue(ln);
825 * if there are any ummapped mbufs, we
826 * must free them, rather than using
827 * them for an ICMP, as they cannot be
830 while ((n = n->m_next) != NULL) {
831 if (n->m_flags & M_EXTPG)
838 icmp6_error2(m, ICMP6_DST_UNREACH,
839 ICMP6_DST_UNREACH_ADDR, 0, ifp);
844 case ND6_LLINFO_REACHABLE:
845 if (!ND6_LLINFO_PERMANENT(ln))
846 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE);
849 case ND6_LLINFO_STALE:
850 if (nd6_is_stale(ln, &delay, &do_switch) != 0) {
852 * No packet has used this entry and GC timeout
853 * has not been passed. Reschedule timer and
856 nd6_llinfo_settimer_locked(ln, delay);
860 if (do_switch == 0) {
862 * GC timer has ended and entry hasn't been used.
863 * Run Garbage collector (RFC 4861, 5.3)
865 if (!ND6_LLINFO_PERMANENT(ln))
870 /* Entry has been used AND delay timer has ended. */
874 case ND6_LLINFO_DELAY:
875 if (ndi && (ndi->flags & ND6_IFF_PERFORMNUD) != 0) {
878 nd6_llinfo_setstate(ln, ND6_LLINFO_PROBE);
881 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE); /* XXX */
883 case ND6_LLINFO_PROBE:
884 if (ln->la_asked < V_nd6_umaxtries) {
892 panic("%s: paths in a dark night can be confusing: %d",
893 __func__, ln->ln_state);
899 nd6_llinfo_settimer_locked(ln, (long)ndi->retrans * hz / 1000);
900 psrc = nd6_llinfo_get_holdsrc(ln, &src);
903 nd6_ns_output(ifp, psrc, pdst, dst, NULL);
913 * ND6 timer routine to expire default route list and prefix list
918 CURVNET_SET((struct vnet *) arg);
919 struct epoch_tracker et;
920 struct nd_prhead prl;
921 struct nd_prefix *pr, *npr;
923 struct in6_ifaddr *ia6, *nia6;
929 nd6_defrouter_timer();
932 * expire interface addresses.
933 * in the past the loop was inside prefix expiry processing.
934 * However, from a stricter speci-confrmance standpoint, we should
935 * rather separate address lifetimes and prefix lifetimes.
937 * XXXRW: in6_ifaddrhead locking.
940 CK_STAILQ_FOREACH_SAFE(ia6, &V_in6_ifaddrhead, ia_link, nia6) {
941 /* check address lifetime */
942 if (IFA6_IS_INVALID(ia6)) {
946 * If the expiring address is temporary, try
947 * regenerating a new one. This would be useful when
948 * we suspended a laptop PC, then turned it on after a
949 * period that could invalidate all temporary
950 * addresses. Although we may have to restart the
951 * loop (see below), it must be after purging the
952 * address. Otherwise, we'd see an infinite loop of
955 if (V_ip6_use_tempaddr &&
956 (ia6->ia6_flags & IN6_IFF_TEMPORARY) != 0) {
957 if (regen_tmpaddr(ia6) == 0)
961 in6_purgeaddr(&ia6->ia_ifa);
964 goto addrloop; /* XXX: see below */
965 } else if (IFA6_IS_DEPRECATED(ia6)) {
966 int oldflags = ia6->ia6_flags;
968 ia6->ia6_flags |= IN6_IFF_DEPRECATED;
971 * If a temporary address has just become deprecated,
972 * regenerate a new one if possible.
974 if (V_ip6_use_tempaddr &&
975 (ia6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
976 (oldflags & IN6_IFF_DEPRECATED) == 0) {
977 if (regen_tmpaddr(ia6) == 0) {
979 * A new temporary address is
981 * XXX: this means the address chain
982 * has changed while we are still in
983 * the loop. Although the change
984 * would not cause disaster (because
985 * it's not a deletion, but an
986 * addition,) we'd rather restart the
987 * loop just for safety. Or does this
988 * significantly reduce performance??
993 } else if ((ia6->ia6_flags & IN6_IFF_TENTATIVE) != 0) {
995 * Schedule DAD for a tentative address. This happens
996 * if the interface was down or not running
997 * when the address was configured.
1001 delay = arc4random() %
1002 (MAX_RTR_SOLICITATION_DELAY * hz);
1003 nd6_dad_start((struct ifaddr *)ia6, delay);
1006 * Check status of the interface. If it is down,
1007 * mark the address as tentative for future DAD.
1010 if ((ND_IFINFO(ifp)->flags & ND6_IFF_NO_DAD) == 0 &&
1011 ((ifp->if_flags & IFF_UP) == 0 ||
1012 (ifp->if_drv_flags & IFF_DRV_RUNNING) == 0 ||
1013 (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) != 0)){
1014 ia6->ia6_flags &= ~IN6_IFF_DUPLICATED;
1015 ia6->ia6_flags |= IN6_IFF_TENTATIVE;
1019 * A new RA might have made a deprecated address
1022 ia6->ia6_flags &= ~IN6_IFF_DEPRECATED;
1029 LIST_FOREACH_SAFE(pr, &V_nd_prefix, ndpr_entry, npr) {
1031 * Expire prefixes. Since the pltime is only used for
1032 * autoconfigured addresses, pltime processing for prefixes is
1035 * Only unlink after all derived addresses have expired. This
1036 * may not occur until two hours after the prefix has expired
1037 * per RFC 4862. If the prefix expires before its derived
1038 * addresses, mark it off-link. This will be done automatically
1039 * after unlinking if no address references remain.
1041 if (pr->ndpr_vltime == ND6_INFINITE_LIFETIME ||
1042 time_uptime - pr->ndpr_lastupdate <= pr->ndpr_vltime)
1045 if (pr->ndpr_addrcnt == 0) {
1046 nd6_prefix_unlink(pr, &prl);
1049 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0) {
1050 genid = V_nd6_list_genid;
1054 (void)nd6_prefix_offlink(pr);
1055 ND6_ONLINK_UNLOCK();
1057 nd6_prefix_rele(pr);
1058 if (genid != V_nd6_list_genid)
1064 while ((pr = LIST_FIRST(&prl)) != NULL) {
1065 LIST_REMOVE(pr, ndpr_entry);
1069 callout_reset(&V_nd6_timer_ch, V_nd6_prune * hz,
1070 nd6_timer, curvnet);
1076 * ia6 - deprecated/invalidated temporary address
1079 regen_tmpaddr(struct in6_ifaddr *ia6)
1083 struct in6_ifaddr *public_ifa6 = NULL;
1087 ifp = ia6->ia_ifa.ifa_ifp;
1088 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1089 struct in6_ifaddr *it6;
1091 if (ifa->ifa_addr->sa_family != AF_INET6)
1094 it6 = (struct in6_ifaddr *)ifa;
1096 /* ignore no autoconf addresses. */
1097 if ((it6->ia6_flags & IN6_IFF_AUTOCONF) == 0)
1100 /* ignore autoconf addresses with different prefixes. */
1101 if (it6->ia6_ndpr == NULL || it6->ia6_ndpr != ia6->ia6_ndpr)
1105 * Now we are looking at an autoconf address with the same
1106 * prefix as ours. If the address is temporary and is still
1107 * preferred, do not create another one. It would be rare, but
1108 * could happen, for example, when we resume a laptop PC after
1111 if ((it6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
1112 !IFA6_IS_DEPRECATED(it6)) {
1118 * This is a public autoconf address that has the same prefix
1119 * as ours. If it is preferred, keep it. We can't break the
1120 * loop here, because there may be a still-preferred temporary
1121 * address with the prefix.
1123 if (!IFA6_IS_DEPRECATED(it6))
1126 if (public_ifa6 != NULL)
1127 ifa_ref(&public_ifa6->ia_ifa);
1129 if (public_ifa6 != NULL) {
1132 if ((e = in6_tmpifadd(public_ifa6, 0, 0)) != 0) {
1133 ifa_free(&public_ifa6->ia_ifa);
1134 log(LOG_NOTICE, "regen_tmpaddr: failed to create a new"
1135 " tmp addr,errno=%d\n", e);
1138 ifa_free(&public_ifa6->ia_ifa);
1146 * Remove prefix and default router list entries corresponding to ifp. Neighbor
1147 * cache entries are freed in in6_domifdetach().
1150 nd6_purge(struct ifnet *ifp)
1152 struct nd_prhead prl;
1153 struct nd_prefix *pr, *npr;
1157 /* Purge default router list entries toward ifp. */
1158 nd6_defrouter_purge(ifp);
1162 * Remove prefixes on ifp. We should have already removed addresses on
1163 * this interface, so no addresses should be referencing these prefixes.
1165 LIST_FOREACH_SAFE(pr, &V_nd_prefix, ndpr_entry, npr) {
1166 if (pr->ndpr_ifp == ifp)
1167 nd6_prefix_unlink(pr, &prl);
1171 /* Delete the unlinked prefix objects. */
1172 while ((pr = LIST_FIRST(&prl)) != NULL) {
1173 LIST_REMOVE(pr, ndpr_entry);
1177 /* cancel default outgoing interface setting */
1178 if (V_nd6_defifindex == ifp->if_index)
1179 nd6_setdefaultiface(0);
1181 if (ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV) {
1182 /* Refresh default router list. */
1183 defrouter_select_fib(ifp->if_fib);
1188 * the caller acquires and releases the lock on the lltbls
1189 * Returns the llentry locked
1192 nd6_lookup(const struct in6_addr *addr6, int flags, struct ifnet *ifp)
1194 struct sockaddr_in6 sin6;
1197 bzero(&sin6, sizeof(sin6));
1198 sin6.sin6_len = sizeof(struct sockaddr_in6);
1199 sin6.sin6_family = AF_INET6;
1200 sin6.sin6_addr = *addr6;
1202 IF_AFDATA_LOCK_ASSERT(ifp);
1204 ln = lla_lookup(LLTABLE6(ifp), flags, (struct sockaddr *)&sin6);
1209 static struct llentry *
1210 nd6_alloc(const struct in6_addr *addr6, int flags, struct ifnet *ifp)
1212 struct sockaddr_in6 sin6;
1215 bzero(&sin6, sizeof(sin6));
1216 sin6.sin6_len = sizeof(struct sockaddr_in6);
1217 sin6.sin6_family = AF_INET6;
1218 sin6.sin6_addr = *addr6;
1220 ln = lltable_alloc_entry(LLTABLE6(ifp), 0, (struct sockaddr *)&sin6);
1222 ln->ln_state = ND6_LLINFO_NOSTATE;
1228 * Test whether a given IPv6 address is a neighbor or not, ignoring
1229 * the actual neighbor cache. The neighbor cache is ignored in order
1230 * to not reenter the routing code from within itself.
1233 nd6_is_new_addr_neighbor(const struct sockaddr_in6 *addr, struct ifnet *ifp)
1235 struct nd_prefix *pr;
1237 struct rt_addrinfo info;
1238 struct sockaddr_in6 rt_key;
1239 const struct sockaddr *dst6;
1244 * A link-local address is always a neighbor.
1245 * XXX: a link does not necessarily specify a single interface.
1247 if (IN6_IS_ADDR_LINKLOCAL(&addr->sin6_addr)) {
1248 struct sockaddr_in6 sin6_copy;
1252 * We need sin6_copy since sa6_recoverscope() may modify the
1256 if (sa6_recoverscope(&sin6_copy))
1257 return (0); /* XXX: should be impossible */
1258 if (in6_setscope(&sin6_copy.sin6_addr, ifp, &zone))
1260 if (sin6_copy.sin6_scope_id == zone)
1266 bzero(&rt_key, sizeof(rt_key));
1267 bzero(&info, sizeof(info));
1268 info.rti_info[RTAX_DST] = (struct sockaddr *)&rt_key;
1271 * If the address matches one of our addresses,
1272 * it should be a neighbor.
1273 * If the address matches one of our on-link prefixes, it should be a
1278 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
1279 if (pr->ndpr_ifp != ifp)
1282 if ((pr->ndpr_stateflags & NDPRF_ONLINK) == 0) {
1283 dst6 = (const struct sockaddr *)&pr->ndpr_prefix;
1286 * We only need to check all FIBs if add_addr_allfibs
1287 * is unset. If set, checking any FIB will suffice.
1289 fibnum = V_rt_add_addr_allfibs ? rt_numfibs - 1 : 0;
1290 for (; fibnum < rt_numfibs; fibnum++) {
1291 genid = V_nd6_list_genid;
1295 * Restore length field before
1298 rt_key.sin6_len = sizeof(rt_key);
1299 error = rib_lookup_info(fibnum, dst6, 0, 0,
1303 if (genid != V_nd6_list_genid)
1312 * This is the case where multiple interfaces
1313 * have the same prefix, but only one is installed
1314 * into the routing table and that prefix entry
1315 * is not the one being examined here.
1317 if (!IN6_ARE_ADDR_EQUAL(&pr->ndpr_prefix.sin6_addr,
1322 if (IN6_ARE_MASKED_ADDR_EQUAL(&pr->ndpr_prefix.sin6_addr,
1323 &addr->sin6_addr, &pr->ndpr_mask)) {
1331 * If the address is assigned on the node of the other side of
1332 * a p2p interface, the address should be a neighbor.
1334 if (ifp->if_flags & IFF_POINTOPOINT) {
1335 struct epoch_tracker et;
1337 NET_EPOCH_ENTER(et);
1338 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1339 if (ifa->ifa_addr->sa_family != addr->sin6_family)
1341 if (ifa->ifa_dstaddr != NULL &&
1342 sa_equal(addr, ifa->ifa_dstaddr)) {
1351 * If the default router list is empty, all addresses are regarded
1352 * as on-link, and thus, as a neighbor.
1354 if (ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV &&
1355 nd6_defrouter_list_empty() &&
1356 V_nd6_defifindex == ifp->if_index) {
1364 * Detect if a given IPv6 address identifies a neighbor on a given link.
1365 * XXX: should take care of the destination of a p2p link?
1368 nd6_is_addr_neighbor(const struct sockaddr_in6 *addr, struct ifnet *ifp)
1370 struct llentry *lle;
1374 IF_AFDATA_UNLOCK_ASSERT(ifp);
1375 if (nd6_is_new_addr_neighbor(addr, ifp))
1379 * Even if the address matches none of our addresses, it might be
1380 * in the neighbor cache.
1382 if ((lle = nd6_lookup(&addr->sin6_addr, LLE_SF(AF_INET6, 0), ifp)) != NULL) {
1389 static __noinline void
1390 nd6_free_children(struct llentry *lle)
1392 struct llentry *child_lle;
1395 LLE_WLOCK_ASSERT(lle);
1397 while ((child_lle = CK_SLIST_FIRST(&lle->lle_children)) != NULL) {
1398 LLE_WLOCK(child_lle);
1399 lltable_unlink_child_entry(child_lle);
1400 llentry_free(child_lle);
1405 * Tries to update @lle address/prepend data with new @lladdr.
1407 * Returns true on success.
1408 * In any case, @lle is returned wlocked.
1410 static __noinline bool
1411 nd6_try_set_entry_addr_locked(struct ifnet *ifp, struct llentry *lle, char *lladdr)
1413 u_char buf[LLE_MAX_LINKHDR];
1418 if (lltable_calc_llheader(ifp, AF_INET6, lladdr, buf, &sz, &off) != 0)
1422 lltable_set_entry_addr(ifp, lle, buf, sz, off);
1424 struct llentry *child_lle;
1425 CK_SLIST_FOREACH(child_lle, &lle->lle_children, lle_child_next) {
1426 LLE_WLOCK(child_lle);
1427 fam = child_lle->r_family;
1429 if (lltable_calc_llheader(ifp, fam, lladdr, buf, &sz, &off) == 0) {
1431 lltable_set_entry_addr(ifp, child_lle, buf, sz, off);
1432 child_lle->ln_state = ND6_LLINFO_REACHABLE;
1434 LLE_WUNLOCK(child_lle);
1441 nd6_try_set_entry_addr(struct ifnet *ifp, struct llentry *lle, char *lladdr)
1444 LLE_WLOCK_ASSERT(lle);
1446 if (!lltable_acquire_wlock(ifp, lle))
1448 bool ret = nd6_try_set_entry_addr_locked(ifp, lle, lladdr);
1449 IF_AFDATA_WUNLOCK(ifp);
1455 * Free an nd6 llinfo entry.
1456 * Since the function would cause significant changes in the kernel, DO NOT
1457 * make it global, unless you have a strong reason for the change, and are sure
1458 * that the change is safe.
1460 * Set noinline to be dtrace-friendly
1462 static __noinline void
1463 nd6_free(struct llentry **lnp, int gc)
1467 struct nd_defrouter *dr;
1472 LLE_WLOCK_ASSERT(ln);
1475 KASSERT((ln->la_flags & LLE_CHILD) == 0, ("child lle"));
1477 ifp = lltable_get_ifp(ln->lle_tbl);
1478 if ((ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV) != 0)
1479 dr = defrouter_lookup_locked(&ln->r_l3addr.addr6, ifp);
1484 if ((ln->la_flags & LLE_DELETED) == 0)
1485 EVENTHANDLER_INVOKE(lle_event, ln, LLENTRY_EXPIRED);
1488 * we used to have pfctlinput(PRC_HOSTDEAD) here.
1489 * even though it is not harmful, it was not really necessary.
1493 nd6_llinfo_settimer_locked(ln, -1);
1495 if (ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV) {
1496 if (dr != NULL && dr->expire &&
1497 ln->ln_state == ND6_LLINFO_STALE && gc) {
1499 * If the reason for the deletion is just garbage
1500 * collection, and the neighbor is an active default
1501 * router, do not delete it. Instead, reset the GC
1502 * timer using the router's lifetime.
1503 * Simply deleting the entry would affect default
1504 * router selection, which is not necessarily a good
1505 * thing, especially when we're using router preference
1507 * XXX: the check for ln_state would be redundant,
1508 * but we intentionally keep it just in case.
1510 if (dr->expire > time_uptime)
1511 nd6_llinfo_settimer_locked(ln,
1512 (dr->expire - time_uptime) * hz);
1514 nd6_llinfo_settimer_locked(ln,
1515 (long)V_nd6_gctimer * hz);
1525 * Unreachablity of a router might affect the default
1526 * router selection and on-link detection of advertised
1531 * Temporarily fake the state to choose a new default
1532 * router and to perform on-link determination of
1533 * prefixes correctly.
1534 * Below the state will be set correctly,
1535 * or the entry itself will be deleted.
1537 ln->ln_state = ND6_LLINFO_INCOMPLETE;
1540 if (ln->ln_router || dr) {
1542 * We need to unlock to avoid a LOR with rt6_flush() with the
1543 * rnh and for the calls to pfxlist_onlink_check() and
1544 * defrouter_select_fib() in the block further down for calls
1545 * into nd6_lookup(). We still hold a ref.
1550 * rt6_flush must be called whether or not the neighbor
1551 * is in the Default Router List.
1552 * See a corresponding comment in nd6_na_input().
1554 rt6_flush(&ln->r_l3addr.addr6, ifp);
1559 * Since defrouter_select_fib() does not affect the
1560 * on-link determination and MIP6 needs the check
1561 * before the default router selection, we perform
1564 pfxlist_onlink_check();
1567 * Refresh default router list.
1569 defrouter_select_fib(dr->ifp->if_fib);
1573 * If this entry was added by an on-link redirect, remove the
1574 * corresponding host route.
1576 if (ln->la_flags & LLE_REDIRECT)
1577 nd6_free_redirect(ln);
1579 if (ln->ln_router || dr)
1584 * Save to unlock. We still hold an extra reference and will not
1585 * free(9) in llentry_free() if someone else holds one as well.
1588 IF_AFDATA_LOCK(ifp);
1590 /* Guard against race with other llentry_free(). */
1591 if (ln->la_flags & LLE_LINKED) {
1592 /* Remove callout reference */
1594 lltable_unlink_entry(ln->lle_tbl, ln);
1596 IF_AFDATA_UNLOCK(ifp);
1598 nd6_free_children(ln);
1606 nd6_isdynrte(const struct rtentry *rt, const struct nhop_object *nh, void *xap)
1609 if (nh->nh_flags & NHF_REDIRECT)
1616 * Remove the rtentry for the given llentry,
1617 * both of which were installed by a redirect.
1620 nd6_free_redirect(const struct llentry *ln)
1623 struct sockaddr_in6 sin6;
1624 struct rt_addrinfo info;
1625 struct rib_cmd_info rc;
1626 struct epoch_tracker et;
1628 lltable_fill_sa_entry(ln, (struct sockaddr *)&sin6);
1629 memset(&info, 0, sizeof(info));
1630 info.rti_info[RTAX_DST] = (struct sockaddr *)&sin6;
1631 info.rti_filter = nd6_isdynrte;
1633 NET_EPOCH_ENTER(et);
1634 for (fibnum = 0; fibnum < rt_numfibs; fibnum++)
1635 rib_action(fibnum, RTM_DELETE, &info, &rc);
1640 * Updates status of the default router route.
1643 check_release_defrouter(struct rib_cmd_info *rc, void *_cbdata)
1645 struct nd_defrouter *dr;
1646 struct nhop_object *nh;
1650 if ((nh != NULL) && (nh->nh_flags & NHF_DEFAULT)) {
1651 dr = defrouter_lookup(&nh->gw6_sa.sin6_addr, nh->nh_ifp);
1660 nd6_subscription_cb(struct rib_head *rnh, struct rib_cmd_info *rc, void *arg)
1664 rib_decompose_notification(rc, check_release_defrouter, NULL);
1666 check_release_defrouter(rc, NULL);
1671 nd6_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp)
1673 struct in6_ndireq *ndi = (struct in6_ndireq *)data;
1674 struct in6_nbrinfo *nbi = (struct in6_nbrinfo *)data;
1675 struct in6_ndifreq *ndif = (struct in6_ndifreq *)data;
1676 struct epoch_tracker et;
1679 if (ifp->if_afdata[AF_INET6] == NULL)
1680 return (EPFNOSUPPORT);
1682 case OSIOCGIFINFO_IN6:
1684 /* XXX: old ndp(8) assumes a positive value for linkmtu. */
1685 bzero(&ND, sizeof(ND));
1686 ND.linkmtu = IN6_LINKMTU(ifp);
1687 ND.maxmtu = ND_IFINFO(ifp)->maxmtu;
1688 ND.basereachable = ND_IFINFO(ifp)->basereachable;
1689 ND.reachable = ND_IFINFO(ifp)->reachable;
1690 ND.retrans = ND_IFINFO(ifp)->retrans;
1691 ND.flags = ND_IFINFO(ifp)->flags;
1692 ND.recalctm = ND_IFINFO(ifp)->recalctm;
1693 ND.chlim = ND_IFINFO(ifp)->chlim;
1695 case SIOCGIFINFO_IN6:
1696 ND = *ND_IFINFO(ifp);
1698 case SIOCSIFINFO_IN6:
1700 * used to change host variables from userland.
1701 * intended for a use on router to reflect RA configurations.
1703 /* 0 means 'unspecified' */
1704 if (ND.linkmtu != 0) {
1705 if (ND.linkmtu < IPV6_MMTU ||
1706 ND.linkmtu > IN6_LINKMTU(ifp)) {
1710 ND_IFINFO(ifp)->linkmtu = ND.linkmtu;
1713 if (ND.basereachable != 0) {
1714 int obasereachable = ND_IFINFO(ifp)->basereachable;
1716 ND_IFINFO(ifp)->basereachable = ND.basereachable;
1717 if (ND.basereachable != obasereachable)
1718 ND_IFINFO(ifp)->reachable =
1719 ND_COMPUTE_RTIME(ND.basereachable);
1721 if (ND.retrans != 0)
1722 ND_IFINFO(ifp)->retrans = ND.retrans;
1724 ND_IFINFO(ifp)->chlim = ND.chlim;
1726 case SIOCSIFINFO_FLAGS:
1729 struct in6_ifaddr *ia;
1731 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) &&
1732 !(ND.flags & ND6_IFF_IFDISABLED)) {
1733 /* ifdisabled 1->0 transision */
1736 * If the interface is marked as ND6_IFF_IFDISABLED and
1737 * has an link-local address with IN6_IFF_DUPLICATED,
1738 * do not clear ND6_IFF_IFDISABLED.
1739 * See RFC 4862, Section 5.4.5.
1741 NET_EPOCH_ENTER(et);
1742 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1743 if (ifa->ifa_addr->sa_family != AF_INET6)
1745 ia = (struct in6_ifaddr *)ifa;
1746 if ((ia->ia6_flags & IN6_IFF_DUPLICATED) &&
1747 IN6_IS_ADDR_LINKLOCAL(IA6_IN6(ia)))
1753 /* LLA is duplicated. */
1754 ND.flags |= ND6_IFF_IFDISABLED;
1755 log(LOG_ERR, "Cannot enable an interface"
1756 " with a link-local address marked"
1759 ND_IFINFO(ifp)->flags &= ~ND6_IFF_IFDISABLED;
1760 if (ifp->if_flags & IFF_UP)
1763 } else if (!(ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) &&
1764 (ND.flags & ND6_IFF_IFDISABLED)) {
1765 /* ifdisabled 0->1 transision */
1766 /* Mark all IPv6 address as tentative. */
1768 ND_IFINFO(ifp)->flags |= ND6_IFF_IFDISABLED;
1769 if (V_ip6_dad_count > 0 &&
1770 (ND_IFINFO(ifp)->flags & ND6_IFF_NO_DAD) == 0) {
1771 NET_EPOCH_ENTER(et);
1772 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead,
1774 if (ifa->ifa_addr->sa_family !=
1777 ia = (struct in6_ifaddr *)ifa;
1778 ia->ia6_flags |= IN6_IFF_TENTATIVE;
1784 if (ND.flags & ND6_IFF_AUTO_LINKLOCAL) {
1785 if (!(ND_IFINFO(ifp)->flags & ND6_IFF_AUTO_LINKLOCAL)) {
1786 /* auto_linklocal 0->1 transision */
1788 /* If no link-local address on ifp, configure */
1789 ND_IFINFO(ifp)->flags |= ND6_IFF_AUTO_LINKLOCAL;
1790 in6_ifattach(ifp, NULL);
1791 } else if (!(ND.flags & ND6_IFF_IFDISABLED) &&
1792 ifp->if_flags & IFF_UP) {
1794 * When the IF already has
1795 * ND6_IFF_AUTO_LINKLOCAL, no link-local
1796 * address is assigned, and IFF_UP, try to
1799 NET_EPOCH_ENTER(et);
1800 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead,
1802 if (ifa->ifa_addr->sa_family !=
1805 ia = (struct in6_ifaddr *)ifa;
1806 if (IN6_IS_ADDR_LINKLOCAL(IA6_IN6(ia)))
1811 /* No LLA is configured. */
1812 in6_ifattach(ifp, NULL);
1815 ND_IFINFO(ifp)->flags = ND.flags;
1819 case SIOCSNDFLUSH_IN6: /* XXX: the ioctl name is confusing... */
1820 /* sync kernel routing table with the default router list */
1822 defrouter_select_fib(RT_ALL_FIBS);
1824 case SIOCSPFXFLUSH_IN6:
1826 /* flush all the prefix advertised by routers */
1827 struct in6_ifaddr *ia, *ia_next;
1828 struct nd_prefix *pr, *next;
1829 struct nd_prhead prl;
1834 LIST_FOREACH_SAFE(pr, &V_nd_prefix, ndpr_entry, next) {
1835 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
1837 nd6_prefix_unlink(pr, &prl);
1841 while ((pr = LIST_FIRST(&prl)) != NULL) {
1842 LIST_REMOVE(pr, ndpr_entry);
1843 /* XXXRW: in6_ifaddrhead locking. */
1844 CK_STAILQ_FOREACH_SAFE(ia, &V_in6_ifaddrhead, ia_link,
1846 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) == 0)
1849 if (ia->ia6_ndpr == pr)
1850 in6_purgeaddr(&ia->ia_ifa);
1856 case SIOCSRTRFLUSH_IN6:
1858 /* flush all the default routers */
1861 nd6_defrouter_flush_all();
1862 defrouter_select_fib(RT_ALL_FIBS);
1865 case SIOCGNBRINFO_IN6:
1868 struct in6_addr nb_addr = nbi->addr; /* make local for safety */
1870 if ((error = in6_setscope(&nb_addr, ifp, NULL)) != 0)
1873 NET_EPOCH_ENTER(et);
1874 ln = nd6_lookup(&nb_addr, LLE_SF(AF_INET6, 0), ifp);
1881 nbi->state = ln->ln_state;
1882 nbi->asked = ln->la_asked;
1883 nbi->isrouter = ln->ln_router;
1884 if (ln->la_expire == 0)
1887 nbi->expire = ln->la_expire + ln->lle_remtime / hz +
1888 (time_second - time_uptime);
1892 case SIOCGDEFIFACE_IN6: /* XXX: should be implemented as a sysctl? */
1893 ndif->ifindex = V_nd6_defifindex;
1895 case SIOCSDEFIFACE_IN6: /* XXX: should be implemented as a sysctl? */
1896 return (nd6_setdefaultiface(ndif->ifindex));
1902 * Calculates new isRouter value based on provided parameters and
1906 nd6_is_router(int type, int code, int is_new, int old_addr, int new_addr,
1911 * ICMP6 type dependent behavior.
1913 * NS: clear IsRouter if new entry
1914 * RS: clear IsRouter
1915 * RA: set IsRouter if there's lladdr
1916 * redir: clear IsRouter if new entry
1919 * The spec says that we must set IsRouter in the following cases:
1920 * - If lladdr exist, set IsRouter. This means (1-5).
1921 * - If it is old entry (!newentry), set IsRouter. This means (7).
1922 * So, based on the spec, in (1-5) and (7) cases we must set IsRouter.
1923 * A quetion arises for (1) case. (1) case has no lladdr in the
1924 * neighbor cache, this is similar to (6).
1925 * This case is rare but we figured that we MUST NOT set IsRouter.
1927 * is_new old_addr new_addr NS RS RA redir
1934 * 1 -- n (6) c c c s
1935 * 1 -- y (7) c c s c s
1939 switch (type & 0xff) {
1940 case ND_NEIGHBOR_SOLICIT:
1942 * New entry must have is_router flag cleared.
1944 if (is_new) /* (6-7) */
1949 * If the icmp is a redirect to a better router, always set the
1950 * is_router flag. Otherwise, if the entry is newly created,
1951 * clear the flag. [RFC 2461, sec 8.3]
1953 if (code == ND_REDIRECT_ROUTER)
1956 if (is_new) /* (6-7) */
1960 case ND_ROUTER_SOLICIT:
1962 * is_router flag must always be cleared.
1966 case ND_ROUTER_ADVERT:
1968 * Mark an entry with lladdr as a router.
1970 if ((!is_new && (old_addr || new_addr)) || /* (2-5) */
1971 (is_new && new_addr)) { /* (7) */
1981 * Create neighbor cache entry and cache link-layer address,
1982 * on reception of inbound ND6 packets. (RS/RA/NS/redirect)
1985 * code - type dependent information
1989 nd6_cache_lladdr(struct ifnet *ifp, struct in6_addr *from, char *lladdr,
1990 int lladdrlen, int type, int code)
1992 struct llentry *ln = NULL, *ln_tmp;
1998 uint16_t router = 0;
1999 struct mbuf *chain = NULL;
2000 u_char linkhdr[LLE_MAX_LINKHDR];
2005 IF_AFDATA_UNLOCK_ASSERT(ifp);
2007 KASSERT(ifp != NULL, ("%s: ifp == NULL", __func__));
2008 KASSERT(from != NULL, ("%s: from == NULL", __func__));
2010 /* nothing must be updated for unspecified address */
2011 if (IN6_IS_ADDR_UNSPECIFIED(from))
2015 * Validation about ifp->if_addrlen and lladdrlen must be done in
2018 * XXX If the link does not have link-layer adderss, what should
2019 * we do? (ifp->if_addrlen == 0)
2020 * Spec says nothing in sections for RA, RS and NA. There's small
2021 * description on it in NS section (RFC 2461 7.2.3).
2023 flags = lladdr ? LLE_EXCLUSIVE : 0;
2024 ln = nd6_lookup(from, LLE_SF(AF_INET6, flags), ifp);
2027 flags |= LLE_EXCLUSIVE;
2028 ln = nd6_alloc(from, 0, ifp);
2033 * Since we already know all the data for the new entry,
2034 * fill it before insertion.
2036 if (lladdr != NULL) {
2037 linkhdrsize = sizeof(linkhdr);
2038 if (lltable_calc_llheader(ifp, AF_INET6, lladdr,
2039 linkhdr, &linkhdrsize, &lladdr_off) != 0)
2041 lltable_set_entry_addr(ifp, ln, linkhdr, linkhdrsize,
2045 IF_AFDATA_WLOCK(ifp);
2047 /* Prefer any existing lle over newly-created one */
2048 ln_tmp = nd6_lookup(from, LLE_SF(AF_INET6, LLE_EXCLUSIVE), ifp);
2050 lltable_link_entry(LLTABLE6(ifp), ln);
2051 IF_AFDATA_WUNLOCK(ifp);
2052 if (ln_tmp == NULL) {
2053 /* No existing lle, mark as new entry (6,7) */
2055 if (lladdr != NULL) { /* (7) */
2056 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE);
2057 EVENTHANDLER_INVOKE(lle_event, ln,
2061 lltable_free_entry(LLTABLE6(ifp), ln);
2066 /* do nothing if static ndp is set */
2067 if ((ln->la_flags & LLE_STATIC)) {
2068 if (flags & LLE_EXCLUSIVE)
2075 olladdr = (ln->la_flags & LLE_VALID) ? 1 : 0;
2076 if (olladdr && lladdr) {
2077 llchange = bcmp(lladdr, ln->ll_addr,
2079 } else if (!olladdr && lladdr)
2085 * newentry olladdr lladdr llchange (*=record)
2088 * 0 n y y (3) * STALE
2090 * 0 y y y (5) * STALE
2091 * 1 -- n -- (6) NOSTATE(= PASSIVE)
2092 * 1 -- y -- (7) * STALE
2096 if (is_newentry == 0 && llchange != 0) {
2097 do_update = 1; /* (3,5) */
2100 * Record source link-layer address
2101 * XXX is it dependent to ifp->if_type?
2103 if (!nd6_try_set_entry_addr(ifp, ln, lladdr)) {
2104 /* Entry was deleted */
2109 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE);
2111 EVENTHANDLER_INVOKE(lle_event, ln, LLENTRY_RESOLVED);
2113 if (ln->la_hold != NULL)
2114 chain = nd6_grab_holdchain(ln);
2117 /* Calculates new router status */
2118 router = nd6_is_router(type, code, is_newentry, olladdr,
2119 lladdr != NULL ? 1 : 0, ln->ln_router);
2121 ln->ln_router = router;
2122 /* Mark non-router redirects with special flag */
2123 if ((type & 0xFF) == ND_REDIRECT && code != ND_REDIRECT_ROUTER)
2124 ln->la_flags |= LLE_REDIRECT;
2126 if (flags & LLE_EXCLUSIVE)
2132 nd6_flush_holdchain(ifp, ln, chain);
2134 nd6_flush_children_holdchain(ifp, ln);
2137 * When the link-layer address of a router changes, select the
2138 * best router again. In particular, when the neighbor entry is newly
2139 * created, it might affect the selection policy.
2140 * Question: can we restrict the first condition to the "is_newentry"
2142 * XXX: when we hear an RA from a new router with the link-layer
2143 * address option, defrouter_select_fib() is called twice, since
2144 * defrtrlist_update called the function as well. However, I believe
2145 * we can compromise the overhead, since it only happens the first
2147 * XXX: although defrouter_select_fib() should not have a bad effect
2148 * for those are not autoconfigured hosts, we explicitly avoid such
2151 if ((do_update || is_newentry) && router &&
2152 ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV) {
2154 * guaranteed recursion
2156 defrouter_select_fib(ifp->if_fib);
2161 nd6_slowtimo(void *arg)
2163 struct epoch_tracker et;
2164 CURVNET_SET((struct vnet *) arg);
2165 struct nd_ifinfo *nd6if;
2168 callout_reset(&V_nd6_slowtimo_ch, ND6_SLOWTIMER_INTERVAL * hz,
2169 nd6_slowtimo, curvnet);
2170 NET_EPOCH_ENTER(et);
2171 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
2172 if (ifp->if_afdata[AF_INET6] == NULL)
2174 nd6if = ND_IFINFO(ifp);
2175 if (nd6if->basereachable && /* already initialized */
2176 (nd6if->recalctm -= ND6_SLOWTIMER_INTERVAL) <= 0) {
2178 * Since reachable time rarely changes by router
2179 * advertisements, we SHOULD insure that a new random
2180 * value gets recomputed at least once every few hours.
2183 nd6if->recalctm = V_nd6_recalc_reachtm_interval;
2184 nd6if->reachable = ND_COMPUTE_RTIME(nd6if->basereachable);
2192 nd6_grab_holdchain(struct llentry *ln)
2196 LLE_WLOCK_ASSERT(ln);
2198 chain = ln->la_hold;
2201 if (ln->ln_state == ND6_LLINFO_STALE) {
2203 * The first time we send a packet to a
2204 * neighbor whose entry is STALE, we have
2205 * to change the state to DELAY and a sets
2206 * a timer to expire in DELAY_FIRST_PROBE_TIME
2207 * seconds to ensure do neighbor unreachability
2208 * detection on expiration.
2211 nd6_llinfo_setstate(ln, ND6_LLINFO_DELAY);
2218 nd6_output_ifp(struct ifnet *ifp, struct ifnet *origifp, struct mbuf *m,
2219 struct sockaddr_in6 *dst, struct route *ro)
2223 struct ip6_hdr *ip6;
2227 mac_netinet6_nd6_send(ifp, m);
2231 * If called from nd6_ns_output() (NS), nd6_na_output() (NA),
2232 * icmp6_redirect_output() (REDIRECT) or from rip6_output() (RS, RA
2233 * as handled by rtsol and rtadvd), mbufs will be tagged for SeND
2234 * to be diverted to user space. When re-injected into the kernel,
2235 * send_output() will directly dispatch them to the outgoing interface.
2237 if (send_sendso_input_hook != NULL) {
2238 mtag = m_tag_find(m, PACKET_TAG_ND_OUTGOING, NULL);
2240 ip6 = mtod(m, struct ip6_hdr *);
2241 ip6len = sizeof(struct ip6_hdr) + ntohs(ip6->ip6_plen);
2242 /* Use the SEND socket */
2243 error = send_sendso_input_hook(m, ifp, SND_OUT,
2245 /* -1 == no app on SEND socket */
2246 if (error == 0 || error != -1)
2251 m_clrprotoflags(m); /* Avoid confusing lower layers. */
2252 IP_PROBE(send, NULL, NULL, mtod(m, struct ip6_hdr *), ifp, NULL,
2253 mtod(m, struct ip6_hdr *));
2255 if ((ifp->if_flags & IFF_LOOPBACK) == 0)
2258 error = (*ifp->if_output)(origifp, m, (struct sockaddr *)dst, ro);
2263 * Lookup link headerfor @sa_dst address. Stores found
2264 * data in @desten buffer. Copy of lle ln_flags can be also
2265 * saved in @pflags if @pflags is non-NULL.
2267 * If destination LLE does not exists or lle state modification
2268 * is required, call "slow" version.
2271 * - 0 on success (address copied to buffer).
2272 * - EWOULDBLOCK (no local error, but address is still unresolved)
2273 * - other errors (alloc failure, etc)
2276 nd6_resolve(struct ifnet *ifp, int gw_flags, struct mbuf *m,
2277 const struct sockaddr *sa_dst, u_char *desten, uint32_t *pflags,
2278 struct llentry **plle)
2280 struct llentry *ln = NULL;
2281 const struct sockaddr_in6 *dst6;
2288 dst6 = (const struct sockaddr_in6 *)sa_dst;
2290 /* discard the packet if IPv6 operation is disabled on the interface */
2291 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)) {
2293 return (ENETDOWN); /* better error? */
2296 if (m != NULL && m->m_flags & M_MCAST) {
2297 switch (ifp->if_type) {
2301 ETHER_MAP_IPV6_MULTICAST(&dst6->sin6_addr,
2306 return (EAFNOSUPPORT);
2310 int family = gw_flags >> 16;
2311 int lookup_flags = plle ? LLE_EXCLUSIVE : LLE_UNLOCKED;
2312 ln = nd6_lookup(&dst6->sin6_addr, LLE_SF(family, lookup_flags), ifp);
2313 if (ln != NULL && (ln->r_flags & RLLE_VALID) != 0) {
2314 /* Entry found, let's copy lle info */
2315 bcopy(ln->r_linkdata, desten, ln->r_hdrlen);
2317 *pflags = LLE_VALID | (ln->r_flags & RLLE_IFADDR);
2318 llentry_provide_feedback(ln);
2325 } else if (plle && ln)
2328 return (nd6_resolve_slow(ifp, family, 0, m, dst6, desten, pflags, plle));
2332 * Finds or creates a new llentry for @addr and @family.
2333 * Returns wlocked llentry or NULL.
2338 * Do not have their own state machine (gets marked as static)
2339 * settimer bails out for child LLEs just in case.
2341 * Locking order: parent lle gets locked first, chen goes the child.
2343 static __noinline struct llentry *
2344 nd6_get_llentry(struct ifnet *ifp, const struct in6_addr *addr, int family)
2346 struct llentry *child_lle = NULL;
2347 struct llentry *lle, *lle_tmp;
2349 lle = nd6_alloc(addr, 0, ifp);
2350 if (lle != NULL && family != AF_INET6) {
2351 child_lle = nd6_alloc(addr, 0, ifp);
2352 if (child_lle == NULL) {
2353 lltable_free_entry(LLTABLE6(ifp), lle);
2356 child_lle->r_family = family;
2357 child_lle->la_flags |= LLE_CHILD | LLE_STATIC;
2358 child_lle->ln_state = ND6_LLINFO_INCOMPLETE;
2362 char ip6buf[INET6_ADDRSTRLEN];
2364 "nd6_get_llentry: can't allocate llinfo for %s "
2366 ip6_sprintf(ip6buf, addr), lle);
2370 IF_AFDATA_WLOCK(ifp);
2372 /* Prefer any existing entry over newly-created one */
2373 lle_tmp = nd6_lookup(addr, LLE_SF(AF_INET6, LLE_EXCLUSIVE), ifp);
2374 if (lle_tmp == NULL)
2375 lltable_link_entry(LLTABLE6(ifp), lle);
2377 lltable_free_entry(LLTABLE6(ifp), lle);
2380 if (child_lle != NULL) {
2381 /* Check if child lle for the same family exists */
2382 lle_tmp = llentry_lookup_family(lle, child_lle->r_family);
2383 LLE_WLOCK(child_lle);
2384 if (lle_tmp == NULL) {
2386 lltable_link_child_entry(lle, child_lle);
2388 /* child lle already exists, free newly-created one */
2389 lltable_free_entry(LLTABLE6(ifp), child_lle);
2390 child_lle = lle_tmp;
2395 IF_AFDATA_WUNLOCK(ifp);
2400 * Do L2 address resolution for @sa_dst address. Stores found
2401 * address in @desten buffer. Copy of lle ln_flags can be also
2402 * saved in @pflags if @pflags is non-NULL.
2405 * Function assume that destination LLE does not exist,
2406 * is invalid or stale, so LLE_EXCLUSIVE lock needs to be acquired.
2408 * Set noinline to be dtrace-friendly
2410 static __noinline int
2411 nd6_resolve_slow(struct ifnet *ifp, int family, int flags, struct mbuf *m,
2412 const struct sockaddr_in6 *dst, u_char *desten, uint32_t *pflags,
2413 struct llentry **plle)
2415 struct llentry *lle = NULL;
2416 struct in6_addr *psrc, src;
2417 int send_ns, ll_len;
2423 * Address resolution or Neighbor Unreachability Detection
2425 * At this point, the destination of the packet must be a unicast
2426 * or an anycast address(i.e. not a multicast).
2428 lle = nd6_lookup(&dst->sin6_addr, LLE_SF(family, LLE_EXCLUSIVE), ifp);
2429 if ((lle == NULL) && nd6_is_addr_neighbor(dst, ifp)) {
2431 * Since nd6_is_addr_neighbor() internally calls nd6_lookup(),
2432 * the condition below is not very efficient. But we believe
2433 * it is tolerable, because this should be a rare case.
2435 lle = nd6_get_llentry(ifp, &dst->sin6_addr, family);
2443 LLE_WLOCK_ASSERT(lle);
2446 * The first time we send a packet to a neighbor whose entry is
2447 * STALE, we have to change the state to DELAY and a sets a timer to
2448 * expire in DELAY_FIRST_PROBE_TIME seconds to ensure do
2449 * neighbor unreachability detection on expiration.
2452 if ((!(lle->la_flags & LLE_CHILD)) && (lle->ln_state == ND6_LLINFO_STALE))
2453 nd6_llinfo_setstate(lle, ND6_LLINFO_DELAY);
2456 * If the neighbor cache entry has a state other than INCOMPLETE
2457 * (i.e. its link-layer address is already resolved), just
2460 if (lle->ln_state > ND6_LLINFO_INCOMPLETE) {
2461 if (flags & LLE_ADDRONLY) {
2462 lladdr = lle->ll_addr;
2463 ll_len = ifp->if_addrlen;
2465 lladdr = lle->r_linkdata;
2466 ll_len = lle->r_hdrlen;
2468 bcopy(lladdr, desten, ll_len);
2470 *pflags = lle->la_flags;
2480 * There is a neighbor cache entry, but no ethernet address
2481 * response yet. Append this latest packet to the end of the
2482 * packet queue in the mbuf. When it exceeds nd6_maxqueuelen,
2483 * the oldest packet in the queue will be removed.
2486 if (lle->la_hold != NULL) {
2487 struct mbuf *m_hold;
2491 for (m_hold = lle->la_hold; m_hold; m_hold = m_hold->m_nextpkt){
2493 if (m_hold->m_nextpkt == NULL) {
2494 m_hold->m_nextpkt = m;
2498 while (i >= V_nd6_maxqueuelen) {
2499 m_hold = lle->la_hold;
2500 lle->la_hold = lle->la_hold->m_nextpkt;
2509 * If there has been no NS for the neighbor after entering the
2510 * INCOMPLETE state, send the first solicitation.
2511 * Note that for newly-created lle la_asked will be 0,
2512 * so we will transition from ND6_LLINFO_NOSTATE to
2513 * ND6_LLINFO_INCOMPLETE state here.
2518 /* If we have child lle, switch to the parent to send NS */
2519 if (lle->la_flags & LLE_CHILD) {
2520 struct llentry *lle_parent = lle->lle_parent;
2525 if (lle->la_asked == 0) {
2528 psrc = nd6_llinfo_get_holdsrc(lle, &src);
2530 nd6_llinfo_setstate(lle, ND6_LLINFO_INCOMPLETE);
2534 nd6_ns_output(ifp, psrc, NULL, &dst->sin6_addr, NULL);
2536 return (EWOULDBLOCK);
2540 * Do L2 address resolution for @sa_dst address. Stores found
2541 * address in @desten buffer. Copy of lle ln_flags can be also
2542 * saved in @pflags if @pflags is non-NULL.
2545 * - 0 on success (address copied to buffer).
2546 * - EWOULDBLOCK (no local error, but address is still unresolved)
2547 * - other errors (alloc failure, etc)
2550 nd6_resolve_addr(struct ifnet *ifp, int flags, const struct sockaddr *dst,
2551 char *desten, uint32_t *pflags)
2555 flags |= LLE_ADDRONLY;
2556 error = nd6_resolve_slow(ifp, AF_INET6, flags, NULL,
2557 (const struct sockaddr_in6 *)dst, desten, pflags, NULL);
2562 nd6_flush_holdchain(struct ifnet *ifp, struct llentry *lle, struct mbuf *chain)
2564 struct mbuf *m, *m_head;
2565 struct sockaddr_in6 dst6;
2570 struct route_in6 ro = {
2571 .ro_prepend = lle->r_linkdata,
2572 .ro_plen = lle->r_hdrlen,
2575 lltable_fill_sa_entry(lle, (struct sockaddr *)&dst6);
2580 m_head = m_head->m_nextpkt;
2581 m->m_nextpkt = NULL;
2582 error = nd6_output_ifp(ifp, ifp, m, &dst6, (struct route *)&ro);
2587 * note that intermediate errors are blindly ignored
2593 nd6_flush_children_holdchain(struct ifnet *ifp, struct llentry *lle)
2595 struct llentry *child_lle;
2600 CK_SLIST_FOREACH(child_lle, &lle->lle_children, lle_child_next) {
2601 LLE_WLOCK(child_lle);
2602 chain = nd6_grab_holdchain(child_lle);
2603 LLE_WUNLOCK(child_lle);
2604 nd6_flush_holdchain(ifp, child_lle, chain);
2609 nd6_need_cache(struct ifnet *ifp)
2612 * XXX: we currently do not make neighbor cache on any interface
2613 * other than Ethernet and GIF.
2616 * - unidirectional tunnels needs no ND
2618 switch (ifp->if_type) {
2622 case IFT_INFINIBAND:
2624 case IFT_PROPVIRTUAL:
2632 * Add pernament ND6 link-layer record for given
2633 * interface address.
2635 * Very similar to IPv4 arp_ifinit(), but:
2636 * 1) IPv6 DAD is performed in different place
2637 * 2) It is called by IPv6 protocol stack in contrast to
2638 * arp_ifinit() which is typically called in SIOCSIFADDR
2639 * driver ioctl handler.
2643 nd6_add_ifa_lle(struct in6_ifaddr *ia)
2646 struct llentry *ln, *ln_tmp;
2647 struct sockaddr *dst;
2649 ifp = ia->ia_ifa.ifa_ifp;
2650 if (nd6_need_cache(ifp) == 0)
2653 dst = (struct sockaddr *)&ia->ia_addr;
2654 ln = lltable_alloc_entry(LLTABLE6(ifp), LLE_IFADDR, dst);
2658 IF_AFDATA_WLOCK(ifp);
2660 /* Unlink any entry if exists */
2661 ln_tmp = lla_lookup(LLTABLE6(ifp), LLE_SF(AF_INET6, LLE_EXCLUSIVE), dst);
2663 lltable_unlink_entry(LLTABLE6(ifp), ln_tmp);
2664 lltable_link_entry(LLTABLE6(ifp), ln);
2665 IF_AFDATA_WUNLOCK(ifp);
2668 EVENTHANDLER_INVOKE(lle_event, ln_tmp, LLENTRY_EXPIRED);
2669 EVENTHANDLER_INVOKE(lle_event, ln, LLENTRY_RESOLVED);
2673 llentry_free(ln_tmp);
2679 * Removes either all lle entries for given @ia, or lle
2680 * corresponding to @ia address.
2683 nd6_rem_ifa_lle(struct in6_ifaddr *ia, int all)
2685 struct sockaddr_in6 mask, addr;
2686 struct sockaddr *saddr, *smask;
2689 ifp = ia->ia_ifa.ifa_ifp;
2690 memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr));
2691 memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask));
2692 saddr = (struct sockaddr *)&addr;
2693 smask = (struct sockaddr *)&mask;
2696 lltable_prefix_free(AF_INET6, saddr, smask, LLE_STATIC);
2698 lltable_delete_addr(LLTABLE6(ifp), LLE_IFADDR, saddr);
2702 clear_llinfo_pqueue(struct llentry *ln)
2704 struct mbuf *m_hold, *m_hold_next;
2706 for (m_hold = ln->la_hold; m_hold; m_hold = m_hold_next) {
2707 m_hold_next = m_hold->m_nextpkt;
2715 nd6_sysctl_prlist(SYSCTL_HANDLER_ARGS)
2717 struct in6_prefix p;
2718 struct sockaddr_in6 s6;
2719 struct nd_prefix *pr;
2720 struct nd_pfxrouter *pfr;
2723 char ip6buf[INET6_ADDRSTRLEN];
2728 error = sysctl_wire_old_buffer(req, 0);
2732 bzero(&p, sizeof(p));
2733 p.origin = PR_ORIG_RA;
2734 bzero(&s6, sizeof(s6));
2735 s6.sin6_family = AF_INET6;
2736 s6.sin6_len = sizeof(s6);
2739 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
2740 p.prefix = pr->ndpr_prefix;
2741 if (sa6_recoverscope(&p.prefix)) {
2742 log(LOG_ERR, "scope error in prefix list (%s)\n",
2743 ip6_sprintf(ip6buf, &p.prefix.sin6_addr));
2744 /* XXX: press on... */
2746 p.raflags = pr->ndpr_raf;
2747 p.prefixlen = pr->ndpr_plen;
2748 p.vltime = pr->ndpr_vltime;
2749 p.pltime = pr->ndpr_pltime;
2750 p.if_index = pr->ndpr_ifp->if_index;
2751 if (pr->ndpr_vltime == ND6_INFINITE_LIFETIME)
2754 /* XXX: we assume time_t is signed. */
2756 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
2757 if (pr->ndpr_vltime < maxexpire - pr->ndpr_lastupdate)
2758 p.expire = pr->ndpr_lastupdate +
2760 (time_second - time_uptime);
2762 p.expire = maxexpire;
2764 p.refcnt = pr->ndpr_addrcnt;
2765 p.flags = pr->ndpr_stateflags;
2767 LIST_FOREACH(pfr, &pr->ndpr_advrtrs, pfr_entry)
2769 error = SYSCTL_OUT(req, &p, sizeof(p));
2772 LIST_FOREACH(pfr, &pr->ndpr_advrtrs, pfr_entry) {
2773 s6.sin6_addr = pfr->router->rtaddr;
2774 if (sa6_recoverscope(&s6))
2776 "scope error in prefix list (%s)\n",
2777 ip6_sprintf(ip6buf, &pfr->router->rtaddr));
2778 error = SYSCTL_OUT(req, &s6, sizeof(s6));
2787 SYSCTL_PROC(_net_inet6_icmp6, ICMPV6CTL_ND6_PRLIST, nd6_prlist,
2788 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE,
2789 NULL, 0, nd6_sysctl_prlist, "S,in6_prefix",
2791 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_MAXQLEN, nd6_maxqueuelen,
2792 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_maxqueuelen), 1, "");
2793 SYSCTL_INT(_net_inet6_icmp6, OID_AUTO, nd6_gctimer,
2794 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_gctimer), (60 * 60 * 24), "");