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"
40 #include <sys/param.h>
41 #include <sys/systm.h>
42 #include <sys/eventhandler.h>
43 #include <sys/callout.h>
45 #include <sys/malloc.h>
47 #include <sys/mutex.h>
48 #include <sys/socket.h>
49 #include <sys/sockio.h>
51 #include <sys/kernel.h>
52 #include <sys/protosw.h>
53 #include <sys/errno.h>
54 #include <sys/syslog.h>
55 #include <sys/rwlock.h>
56 #include <sys/queue.h>
58 #include <sys/sysctl.h>
61 #include <net/if_var.h>
62 #include <net/if_dl.h>
63 #include <net/if_types.h>
64 #include <net/route.h>
67 #include <netinet/in.h>
68 #include <netinet/in_kdtrace.h>
69 #include <net/if_llatbl.h>
70 #include <netinet/if_ether.h>
71 #include <netinet6/in6_var.h>
72 #include <netinet/ip6.h>
73 #include <netinet6/ip6_var.h>
74 #include <netinet6/scope6_var.h>
75 #include <netinet6/nd6.h>
76 #include <netinet6/in6_ifattach.h>
77 #include <netinet/icmp6.h>
78 #include <netinet6/send.h>
80 #include <sys/limits.h>
82 #include <security/mac/mac_framework.h>
84 #define ND6_SLOWTIMER_INTERVAL (60 * 60) /* 1 hour */
85 #define ND6_RECALC_REACHTM_INTERVAL (60 * 120) /* 2 hours */
87 #define SIN6(s) ((const struct sockaddr_in6 *)(s))
89 MALLOC_DEFINE(M_IP6NDP, "ip6ndp", "IPv6 Neighbor Discovery");
92 VNET_DEFINE(int, nd6_prune) = 1; /* walk list every 1 seconds */
93 VNET_DEFINE(int, nd6_delay) = 5; /* delay first probe time 5 second */
94 VNET_DEFINE(int, nd6_umaxtries) = 3; /* maximum unicast query */
95 VNET_DEFINE(int, nd6_mmaxtries) = 3; /* maximum multicast query */
96 VNET_DEFINE(int, nd6_useloopback) = 1; /* use loopback interface for
98 VNET_DEFINE(int, nd6_gctimer) = (60 * 60 * 24); /* 1 day: garbage
101 /* preventing too many loops in ND option parsing */
102 VNET_DEFINE_STATIC(int, nd6_maxndopt) = 10; /* max # of ND options allowed */
104 VNET_DEFINE(int, nd6_maxnudhint) = 0; /* max # of subsequent upper
106 VNET_DEFINE_STATIC(int, nd6_maxqueuelen) = 1; /* max pkts cached in unresolved
108 #define V_nd6_maxndopt VNET(nd6_maxndopt)
109 #define V_nd6_maxqueuelen VNET(nd6_maxqueuelen)
112 VNET_DEFINE(int, nd6_debug) = 1;
114 VNET_DEFINE(int, nd6_debug) = 0;
117 static eventhandler_tag lle_event_eh, iflladdr_event_eh, ifnet_link_event_eh;
119 VNET_DEFINE(struct nd_drhead, nd_defrouter);
120 VNET_DEFINE(struct nd_prhead, nd_prefix);
121 VNET_DEFINE(struct rwlock, nd6_lock);
122 VNET_DEFINE(uint64_t, nd6_list_genid);
123 VNET_DEFINE(struct mtx, nd6_onlink_mtx);
125 VNET_DEFINE(int, nd6_recalc_reachtm_interval) = ND6_RECALC_REACHTM_INTERVAL;
126 #define V_nd6_recalc_reachtm_interval VNET(nd6_recalc_reachtm_interval)
128 int (*send_sendso_input_hook)(struct mbuf *, struct ifnet *, int, int);
130 static int nd6_is_new_addr_neighbor(const struct sockaddr_in6 *,
132 static void nd6_setmtu0(struct ifnet *, struct nd_ifinfo *);
133 static void nd6_slowtimo(void *);
134 static int regen_tmpaddr(struct in6_ifaddr *);
135 static void nd6_free(struct llentry **, int);
136 static void nd6_free_redirect(const struct llentry *);
137 static void nd6_llinfo_timer(void *);
138 static void nd6_llinfo_settimer_locked(struct llentry *, long);
139 static void clear_llinfo_pqueue(struct llentry *);
140 static void nd6_rtrequest(int, struct rtentry *, struct rt_addrinfo *);
141 static int nd6_resolve_slow(struct ifnet *, int, struct mbuf *,
142 const struct sockaddr_in6 *, u_char *, uint32_t *, struct llentry **);
143 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(struct callout, nd6_timer_ch);
150 #define V_nd6_timer_ch VNET(nd6_timer_ch)
153 nd6_lle_event(void *arg __unused, struct llentry *lle, int evt)
155 struct rt_addrinfo rtinfo;
156 struct sockaddr_in6 dst;
157 struct sockaddr_dl gw;
162 LLE_WLOCK_ASSERT(lle);
164 if (lltable_get_af(lle->lle_tbl) != AF_INET6)
168 case LLENTRY_RESOLVED:
170 KASSERT(lle->la_flags & LLE_VALID,
171 ("%s: %p resolved but not valid?", __func__, lle));
173 case LLENTRY_EXPIRED:
180 ifp = lltable_get_ifp(lle->lle_tbl);
182 bzero(&dst, sizeof(dst));
183 bzero(&gw, sizeof(gw));
184 bzero(&rtinfo, sizeof(rtinfo));
185 lltable_fill_sa_entry(lle, (struct sockaddr *)&dst);
186 dst.sin6_scope_id = in6_getscopezone(ifp,
187 in6_addrscope(&dst.sin6_addr));
188 gw.sdl_len = sizeof(struct sockaddr_dl);
189 gw.sdl_family = AF_LINK;
190 gw.sdl_alen = ifp->if_addrlen;
191 gw.sdl_index = ifp->if_index;
192 gw.sdl_type = ifp->if_type;
193 if (evt == LLENTRY_RESOLVED)
194 bcopy(lle->ll_addr, gw.sdl_data, ifp->if_addrlen);
195 rtinfo.rti_info[RTAX_DST] = (struct sockaddr *)&dst;
196 rtinfo.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&gw;
197 rtinfo.rti_addrs = RTA_DST | RTA_GATEWAY;
198 fibnum = V_rt_add_addr_allfibs ? RT_ALL_FIBS : ifp->if_fib;
199 rt_missmsg_fib(type, &rtinfo, RTF_HOST | RTF_LLDATA | (
200 type == RTM_ADD ? RTF_UP: 0), 0, fibnum);
204 * A handler for interface link layer address change event.
207 nd6_iflladdr(void *arg __unused, struct ifnet *ifp)
210 lltable_update_ifaddr(LLTABLE6(ifp));
217 mtx_init(&V_nd6_onlink_mtx, "nd6 onlink", NULL, MTX_DEF);
218 rw_init(&V_nd6_lock, "nd6 list");
220 LIST_INIT(&V_nd_prefix);
221 TAILQ_INIT(&V_nd_defrouter);
224 callout_init(&V_nd6_slowtimo_ch, 0);
225 callout_reset(&V_nd6_slowtimo_ch, ND6_SLOWTIMER_INTERVAL * hz,
226 nd6_slowtimo, curvnet);
228 callout_init(&V_nd6_timer_ch, 0);
229 callout_reset(&V_nd6_timer_ch, hz, nd6_timer, curvnet);
232 if (IS_DEFAULT_VNET(curvnet)) {
233 lle_event_eh = EVENTHANDLER_REGISTER(lle_event, nd6_lle_event,
234 NULL, EVENTHANDLER_PRI_ANY);
235 iflladdr_event_eh = EVENTHANDLER_REGISTER(iflladdr_event,
236 nd6_iflladdr, NULL, EVENTHANDLER_PRI_ANY);
237 ifnet_link_event_eh = EVENTHANDLER_REGISTER(ifnet_link_event,
238 nd6_ifnet_link_event, NULL, EVENTHANDLER_PRI_ANY);
247 callout_drain(&V_nd6_slowtimo_ch);
248 callout_drain(&V_nd6_timer_ch);
249 if (IS_DEFAULT_VNET(curvnet)) {
250 EVENTHANDLER_DEREGISTER(ifnet_link_event, ifnet_link_event_eh);
251 EVENTHANDLER_DEREGISTER(lle_event, lle_event_eh);
252 EVENTHANDLER_DEREGISTER(iflladdr_event, iflladdr_event_eh);
254 rw_destroy(&V_nd6_lock);
255 mtx_destroy(&V_nd6_onlink_mtx);
260 nd6_ifattach(struct ifnet *ifp)
262 struct nd_ifinfo *nd;
264 nd = malloc(sizeof(*nd), M_IP6NDP, M_WAITOK | M_ZERO);
267 nd->chlim = IPV6_DEFHLIM;
268 nd->basereachable = REACHABLE_TIME;
269 nd->reachable = ND_COMPUTE_RTIME(nd->basereachable);
270 nd->retrans = RETRANS_TIMER;
272 nd->flags = ND6_IFF_PERFORMNUD;
274 /* A loopback interface always has ND6_IFF_AUTO_LINKLOCAL.
275 * XXXHRS: Clear ND6_IFF_AUTO_LINKLOCAL on an IFT_BRIDGE interface by
276 * default regardless of the V_ip6_auto_linklocal configuration to
277 * give a reasonable default behavior.
279 if ((V_ip6_auto_linklocal && ifp->if_type != IFT_BRIDGE) ||
280 (ifp->if_flags & IFF_LOOPBACK))
281 nd->flags |= ND6_IFF_AUTO_LINKLOCAL;
283 * A loopback interface does not need to accept RTADV.
284 * XXXHRS: Clear ND6_IFF_ACCEPT_RTADV on an IFT_BRIDGE interface by
285 * default regardless of the V_ip6_accept_rtadv configuration to
286 * prevent the interface from accepting RA messages arrived
287 * on one of the member interfaces with ND6_IFF_ACCEPT_RTADV.
289 if (V_ip6_accept_rtadv &&
290 !(ifp->if_flags & IFF_LOOPBACK) &&
291 (ifp->if_type != IFT_BRIDGE))
292 nd->flags |= ND6_IFF_ACCEPT_RTADV;
293 if (V_ip6_no_radr && !(ifp->if_flags & IFF_LOOPBACK))
294 nd->flags |= ND6_IFF_NO_RADR;
296 /* XXX: we cannot call nd6_setmtu since ifp is not fully initialized */
297 nd6_setmtu0(ifp, nd);
303 nd6_ifdetach(struct ifnet *ifp, struct nd_ifinfo *nd)
305 struct epoch_tracker et;
306 struct ifaddr *ifa, *next;
309 CK_STAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) {
310 if (ifa->ifa_addr->sa_family != AF_INET6)
313 /* stop DAD processing */
322 * Reset ND level link MTU. This function is called when the physical MTU
323 * changes, which means we might have to adjust the ND level MTU.
326 nd6_setmtu(struct ifnet *ifp)
328 if (ifp->if_afdata[AF_INET6] == NULL)
331 nd6_setmtu0(ifp, ND_IFINFO(ifp));
334 /* XXX todo: do not maintain copy of ifp->if_mtu in ndi->maxmtu */
336 nd6_setmtu0(struct ifnet *ifp, struct nd_ifinfo *ndi)
340 omaxmtu = ndi->maxmtu;
341 ndi->maxmtu = ifp->if_mtu;
344 * Decreasing the interface MTU under IPV6 minimum MTU may cause
345 * undesirable situation. We thus notify the operator of the change
346 * explicitly. The check for omaxmtu is necessary to restrict the
347 * log to the case of changing the MTU, not initializing it.
349 if (omaxmtu >= IPV6_MMTU && ndi->maxmtu < IPV6_MMTU) {
350 log(LOG_NOTICE, "nd6_setmtu0: "
351 "new link MTU on %s (%lu) is too small for IPv6\n",
352 if_name(ifp), (unsigned long)ndi->maxmtu);
355 if (ndi->maxmtu > V_in6_maxmtu)
356 in6_setmaxmtu(); /* check all interfaces just in case */
361 nd6_option_init(void *opt, int icmp6len, union nd_opts *ndopts)
364 bzero(ndopts, sizeof(*ndopts));
365 ndopts->nd_opts_search = (struct nd_opt_hdr *)opt;
367 = (struct nd_opt_hdr *)(((u_char *)opt) + icmp6len);
370 ndopts->nd_opts_done = 1;
371 ndopts->nd_opts_search = NULL;
376 * Take one ND option.
379 nd6_option(union nd_opts *ndopts)
381 struct nd_opt_hdr *nd_opt;
384 KASSERT(ndopts != NULL, ("%s: ndopts == NULL", __func__));
385 KASSERT(ndopts->nd_opts_last != NULL, ("%s: uninitialized ndopts",
387 if (ndopts->nd_opts_search == NULL)
389 if (ndopts->nd_opts_done)
392 nd_opt = ndopts->nd_opts_search;
394 /* make sure nd_opt_len is inside the buffer */
395 if ((caddr_t)&nd_opt->nd_opt_len >= (caddr_t)ndopts->nd_opts_last) {
396 bzero(ndopts, sizeof(*ndopts));
400 olen = nd_opt->nd_opt_len << 3;
403 * Message validation requires that all included
404 * options have a length that is greater than zero.
406 bzero(ndopts, sizeof(*ndopts));
410 ndopts->nd_opts_search = (struct nd_opt_hdr *)((caddr_t)nd_opt + olen);
411 if (ndopts->nd_opts_search > ndopts->nd_opts_last) {
412 /* option overruns the end of buffer, invalid */
413 bzero(ndopts, sizeof(*ndopts));
415 } else if (ndopts->nd_opts_search == ndopts->nd_opts_last) {
416 /* reached the end of options chain */
417 ndopts->nd_opts_done = 1;
418 ndopts->nd_opts_search = NULL;
424 * Parse multiple ND options.
425 * This function is much easier to use, for ND routines that do not need
426 * multiple options of the same type.
429 nd6_options(union nd_opts *ndopts)
431 struct nd_opt_hdr *nd_opt;
434 KASSERT(ndopts != NULL, ("%s: ndopts == NULL", __func__));
435 KASSERT(ndopts->nd_opts_last != NULL, ("%s: uninitialized ndopts",
437 if (ndopts->nd_opts_search == NULL)
441 nd_opt = nd6_option(ndopts);
442 if (nd_opt == NULL && ndopts->nd_opts_last == NULL) {
444 * Message validation requires that all included
445 * options have a length that is greater than zero.
447 ICMP6STAT_INC(icp6s_nd_badopt);
448 bzero(ndopts, sizeof(*ndopts));
455 switch (nd_opt->nd_opt_type) {
456 case ND_OPT_SOURCE_LINKADDR:
457 case ND_OPT_TARGET_LINKADDR:
459 case ND_OPT_REDIRECTED_HEADER:
461 if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) {
463 "duplicated ND6 option found (type=%d)\n",
464 nd_opt->nd_opt_type));
467 ndopts->nd_opt_array[nd_opt->nd_opt_type]
471 case ND_OPT_PREFIX_INFORMATION:
472 if (ndopts->nd_opt_array[nd_opt->nd_opt_type] == 0) {
473 ndopts->nd_opt_array[nd_opt->nd_opt_type]
476 ndopts->nd_opts_pi_end =
477 (struct nd_opt_prefix_info *)nd_opt;
479 /* What about ND_OPT_ROUTE_INFO? RFC 4191 */
480 case ND_OPT_RDNSS: /* RFC 6106 */
481 case ND_OPT_DNSSL: /* RFC 6106 */
483 * Silently ignore options we know and do not care about
489 * Unknown options must be silently ignored,
490 * to accommodate future extension to the protocol.
493 "nd6_options: unsupported option %d - "
494 "option ignored\n", nd_opt->nd_opt_type));
499 if (i > V_nd6_maxndopt) {
500 ICMP6STAT_INC(icp6s_nd_toomanyopt);
501 nd6log((LOG_INFO, "too many loop in nd opt\n"));
505 if (ndopts->nd_opts_done)
513 * ND6 timer routine to handle ND6 entries
516 nd6_llinfo_settimer_locked(struct llentry *ln, long tick)
520 LLE_WLOCK_ASSERT(ln);
525 canceled = callout_stop(&ln->lle_timer);
527 ln->la_expire = time_uptime + tick / hz;
529 if (tick > INT_MAX) {
530 ln->ln_ntick = tick - INT_MAX;
531 canceled = callout_reset(&ln->lle_timer, INT_MAX,
532 nd6_llinfo_timer, ln);
535 canceled = callout_reset(&ln->lle_timer, tick,
536 nd6_llinfo_timer, ln);
544 * Gets source address of the first packet in hold queue
545 * and stores it in @src.
546 * Returns pointer to @src (if hold queue is not empty) or NULL.
548 * Set noinline to be dtrace-friendly
550 static __noinline struct in6_addr *
551 nd6_llinfo_get_holdsrc(struct llentry *ln, struct in6_addr *src)
556 if (ln->la_hold == NULL)
560 * assume every packet in la_hold has the same IP header
563 if (sizeof(hdr) > m->m_len)
566 m_copydata(m, 0, sizeof(hdr), (caddr_t)&hdr);
573 * Checks if we need to switch from STALE state.
575 * RFC 4861 requires switching from STALE to DELAY state
576 * on first packet matching entry, waiting V_nd6_delay and
577 * transition to PROBE state (if upper layer confirmation was
580 * This code performs a bit differently:
581 * On packet hit we don't change state (but desired state
582 * can be guessed by control plane). However, after V_nd6_delay
583 * seconds code will transition to PROBE state (so DELAY state
584 * is kinda skipped in most situations).
586 * Typically, V_nd6_gctimer is bigger than V_nd6_delay, so
587 * we perform the following upon entering STALE state:
589 * 1) Arm timer to run each V_nd6_delay seconds to make sure that
590 * if packet was transmitted at the start of given interval, we
591 * would be able to switch to PROBE state in V_nd6_delay seconds
594 * 2) Reschedule timer until original V_nd6_gctimer expires keeping
595 * lle in STALE state (remaining timer value stored in lle_remtime).
597 * 3) Reschedule timer if packet was transmitted less that V_nd6_delay
600 * Returns non-zero value if the entry is still STALE (storing
601 * the next timer interval in @pdelay).
603 * Returns zero value if original timer expired or we need to switch to
604 * PROBE (store that in @do_switch variable).
607 nd6_is_stale(struct llentry *lle, long *pdelay, int *do_switch)
609 int nd_delay, nd_gctimer, r_skip_req;
614 nd_gctimer = V_nd6_gctimer;
615 nd_delay = V_nd6_delay;
618 r_skip_req = lle->r_skip_req;
619 lle_hittime = lle->lle_hittime;
622 if (r_skip_req > 0) {
625 * Nonzero r_skip_req value was set upon entering
626 * STALE state. Since value was not changed, no
627 * packets were passed using this lle. Ask for
628 * timer reschedule and keep STALE state.
630 delay = (long)(MIN(nd_gctimer, nd_delay));
632 if (lle->lle_remtime > delay)
633 lle->lle_remtime -= delay;
635 delay = lle->lle_remtime;
636 lle->lle_remtime = 0;
642 * The original ng6_gctime timeout ended,
643 * no more rescheduling.
653 * Packet received. Verify timestamp
655 delay = (long)(time_uptime - lle_hittime);
656 if (delay < nd_delay) {
659 * V_nd6_delay still not passed since the first
660 * hit in STALE state.
661 * Reshedule timer and return.
663 *pdelay = (long)(nd_delay - delay) * hz;
667 /* Request switching to probe */
674 * Switch @lle state to new state optionally arming timers.
676 * Set noinline to be dtrace-friendly
679 nd6_llinfo_setstate(struct llentry *lle, int newstate)
682 int nd_gctimer, nd_delay;
689 case ND6_LLINFO_INCOMPLETE:
690 ifp = lle->lle_tbl->llt_ifp;
691 delay = (long)ND_IFINFO(ifp)->retrans * hz / 1000;
693 case ND6_LLINFO_REACHABLE:
694 if (!ND6_LLINFO_PERMANENT(lle)) {
695 ifp = lle->lle_tbl->llt_ifp;
696 delay = (long)ND_IFINFO(ifp)->reachable * hz;
699 case ND6_LLINFO_STALE:
702 * Notify fast path that we want to know if any packet
703 * is transmitted by setting r_skip_req.
708 nd_delay = V_nd6_delay;
709 nd_gctimer = V_nd6_gctimer;
711 delay = (long)(MIN(nd_gctimer, nd_delay)) * hz;
712 remtime = (long)nd_gctimer * hz - delay;
714 case ND6_LLINFO_DELAY:
716 delay = (long)V_nd6_delay * hz;
721 nd6_llinfo_settimer_locked(lle, delay);
723 lle->lle_remtime = remtime;
724 lle->ln_state = newstate;
728 * Timer-dependent part of nd state machine.
730 * Set noinline to be dtrace-friendly
732 static __noinline void
733 nd6_llinfo_timer(void *arg)
736 struct in6_addr *dst, *pdst, *psrc, src;
738 struct nd_ifinfo *ndi;
739 int do_switch, send_ns;
742 KASSERT(arg != NULL, ("%s: arg NULL", __func__));
743 ln = (struct llentry *)arg;
744 ifp = lltable_get_ifp(ln->lle_tbl);
745 CURVNET_SET(ifp->if_vnet);
749 if (callout_pending(&ln->lle_timer)) {
751 * Here we are a bit odd here in the treatment of
752 * active/pending. If the pending bit is set, it got
753 * rescheduled before I ran. The active
754 * bit we ignore, since if it was stopped
755 * in ll_tablefree() and was currently running
756 * it would have return 0 so the code would
757 * not have deleted it since the callout could
758 * not be stopped so we want to go through
759 * with the delete here now. If the callout
760 * was restarted, the pending bit will be back on and
761 * we just want to bail since the callout_reset would
762 * return 1 and our reference would have been removed
763 * by nd6_llinfo_settimer_locked above since canceled
771 ndi = ND_IFINFO(ifp);
773 dst = &ln->r_l3addr.addr6;
776 if (ln->ln_ntick > 0) {
777 if (ln->ln_ntick > INT_MAX) {
778 ln->ln_ntick -= INT_MAX;
779 nd6_llinfo_settimer_locked(ln, INT_MAX);
782 nd6_llinfo_settimer_locked(ln, ln->ln_ntick);
787 if (ln->la_flags & LLE_STATIC) {
791 if (ln->la_flags & LLE_DELETED) {
796 switch (ln->ln_state) {
797 case ND6_LLINFO_INCOMPLETE:
798 if (ln->la_asked < V_nd6_mmaxtries) {
801 /* Send NS to multicast address */
804 struct mbuf *m = ln->la_hold;
809 * assuming every packet in la_hold has the
810 * same IP header. Send error after unlock.
815 clear_llinfo_pqueue(ln);
819 icmp6_error2(m, ICMP6_DST_UNREACH,
820 ICMP6_DST_UNREACH_ADDR, 0, ifp);
823 case ND6_LLINFO_REACHABLE:
824 if (!ND6_LLINFO_PERMANENT(ln))
825 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE);
828 case ND6_LLINFO_STALE:
829 if (nd6_is_stale(ln, &delay, &do_switch) != 0) {
832 * No packet has used this entry and GC timeout
833 * has not been passed. Reshedule timer and
836 nd6_llinfo_settimer_locked(ln, delay);
840 if (do_switch == 0) {
843 * GC timer has ended and entry hasn't been used.
844 * Run Garbage collector (RFC 4861, 5.3)
846 if (!ND6_LLINFO_PERMANENT(ln))
851 /* Entry has been used AND delay timer has ended. */
855 case ND6_LLINFO_DELAY:
856 if (ndi && (ndi->flags & ND6_IFF_PERFORMNUD) != 0) {
859 nd6_llinfo_setstate(ln, ND6_LLINFO_PROBE);
862 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE); /* XXX */
864 case ND6_LLINFO_PROBE:
865 if (ln->la_asked < V_nd6_umaxtries) {
873 panic("%s: paths in a dark night can be confusing: %d",
874 __func__, ln->ln_state);
880 nd6_llinfo_settimer_locked(ln, (long)ndi->retrans * hz / 1000);
881 psrc = nd6_llinfo_get_holdsrc(ln, &src);
884 nd6_ns_output(ifp, psrc, pdst, dst, NULL);
894 * ND6 timer routine to expire default route list and prefix list
899 CURVNET_SET((struct vnet *) arg);
900 struct nd_drhead drq;
901 struct nd_prhead prl;
902 struct nd_defrouter *dr, *ndr;
903 struct nd_prefix *pr, *npr;
905 struct in6_ifaddr *ia6, *nia6;
912 TAILQ_FOREACH_SAFE(dr, &V_nd_defrouter, dr_entry, ndr)
913 if (dr->expire && dr->expire < time_uptime)
914 defrouter_unlink(dr, &drq);
917 while ((dr = TAILQ_FIRST(&drq)) != NULL) {
918 TAILQ_REMOVE(&drq, dr, dr_entry);
923 * expire interface addresses.
924 * in the past the loop was inside prefix expiry processing.
925 * However, from a stricter speci-confrmance standpoint, we should
926 * rather separate address lifetimes and prefix lifetimes.
928 * XXXRW: in6_ifaddrhead locking.
931 CK_STAILQ_FOREACH_SAFE(ia6, &V_in6_ifaddrhead, ia_link, nia6) {
932 /* check address lifetime */
933 if (IFA6_IS_INVALID(ia6)) {
937 * If the expiring address is temporary, try
938 * regenerating a new one. This would be useful when
939 * we suspended a laptop PC, then turned it on after a
940 * period that could invalidate all temporary
941 * addresses. Although we may have to restart the
942 * loop (see below), it must be after purging the
943 * address. Otherwise, we'd see an infinite loop of
946 if (V_ip6_use_tempaddr &&
947 (ia6->ia6_flags & IN6_IFF_TEMPORARY) != 0) {
948 if (regen_tmpaddr(ia6) == 0)
952 in6_purgeaddr(&ia6->ia_ifa);
955 goto addrloop; /* XXX: see below */
956 } else if (IFA6_IS_DEPRECATED(ia6)) {
957 int oldflags = ia6->ia6_flags;
959 ia6->ia6_flags |= IN6_IFF_DEPRECATED;
962 * If a temporary address has just become deprecated,
963 * regenerate a new one if possible.
965 if (V_ip6_use_tempaddr &&
966 (ia6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
967 (oldflags & IN6_IFF_DEPRECATED) == 0) {
969 if (regen_tmpaddr(ia6) == 0) {
971 * A new temporary address is
973 * XXX: this means the address chain
974 * has changed while we are still in
975 * the loop. Although the change
976 * would not cause disaster (because
977 * it's not a deletion, but an
978 * addition,) we'd rather restart the
979 * loop just for safety. Or does this
980 * significantly reduce performance??
985 } else if ((ia6->ia6_flags & IN6_IFF_TENTATIVE) != 0) {
987 * Schedule DAD for a tentative address. This happens
988 * if the interface was down or not running
989 * when the address was configured.
993 delay = arc4random() %
994 (MAX_RTR_SOLICITATION_DELAY * hz);
995 nd6_dad_start((struct ifaddr *)ia6, delay);
998 * Check status of the interface. If it is down,
999 * mark the address as tentative for future DAD.
1002 if ((ND_IFINFO(ifp)->flags & ND6_IFF_NO_DAD) == 0 &&
1003 ((ifp->if_flags & IFF_UP) == 0 ||
1004 (ifp->if_drv_flags & IFF_DRV_RUNNING) == 0 ||
1005 (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) != 0)){
1006 ia6->ia6_flags &= ~IN6_IFF_DUPLICATED;
1007 ia6->ia6_flags |= IN6_IFF_TENTATIVE;
1011 * A new RA might have made a deprecated address
1014 ia6->ia6_flags &= ~IN6_IFF_DEPRECATED;
1020 LIST_FOREACH_SAFE(pr, &V_nd_prefix, ndpr_entry, npr) {
1022 * Expire prefixes. Since the pltime is only used for
1023 * autoconfigured addresses, pltime processing for prefixes is
1026 * Only unlink after all derived addresses have expired. This
1027 * may not occur until two hours after the prefix has expired
1028 * per RFC 4862. If the prefix expires before its derived
1029 * addresses, mark it off-link. This will be done automatically
1030 * after unlinking if no address references remain.
1032 if (pr->ndpr_vltime == ND6_INFINITE_LIFETIME ||
1033 time_uptime - pr->ndpr_lastupdate <= pr->ndpr_vltime)
1036 if (pr->ndpr_addrcnt == 0) {
1037 nd6_prefix_unlink(pr, &prl);
1040 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0) {
1041 genid = V_nd6_list_genid;
1045 (void)nd6_prefix_offlink(pr);
1046 ND6_ONLINK_UNLOCK();
1048 nd6_prefix_rele(pr);
1049 if (genid != V_nd6_list_genid)
1055 while ((pr = LIST_FIRST(&prl)) != NULL) {
1056 LIST_REMOVE(pr, ndpr_entry);
1060 callout_reset(&V_nd6_timer_ch, V_nd6_prune * hz,
1061 nd6_timer, curvnet);
1067 * ia6 - deprecated/invalidated temporary address
1070 regen_tmpaddr(struct in6_ifaddr *ia6)
1072 struct epoch_tracker et;
1075 struct in6_ifaddr *public_ifa6 = NULL;
1077 ifp = ia6->ia_ifa.ifa_ifp;
1078 NET_EPOCH_ENTER(et);
1079 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1080 struct in6_ifaddr *it6;
1082 if (ifa->ifa_addr->sa_family != AF_INET6)
1085 it6 = (struct in6_ifaddr *)ifa;
1087 /* ignore no autoconf addresses. */
1088 if ((it6->ia6_flags & IN6_IFF_AUTOCONF) == 0)
1091 /* ignore autoconf addresses with different prefixes. */
1092 if (it6->ia6_ndpr == NULL || it6->ia6_ndpr != ia6->ia6_ndpr)
1096 * Now we are looking at an autoconf address with the same
1097 * prefix as ours. If the address is temporary and is still
1098 * preferred, do not create another one. It would be rare, but
1099 * could happen, for example, when we resume a laptop PC after
1102 if ((it6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
1103 !IFA6_IS_DEPRECATED(it6)) {
1109 * This is a public autoconf address that has the same prefix
1110 * as ours. If it is preferred, keep it. We can't break the
1111 * loop here, because there may be a still-preferred temporary
1112 * address with the prefix.
1114 if (!IFA6_IS_DEPRECATED(it6))
1117 if (public_ifa6 != NULL)
1118 ifa_ref(&public_ifa6->ia_ifa);
1121 if (public_ifa6 != NULL) {
1124 if ((e = in6_tmpifadd(public_ifa6, 0, 0)) != 0) {
1125 ifa_free(&public_ifa6->ia_ifa);
1126 log(LOG_NOTICE, "regen_tmpaddr: failed to create a new"
1127 " tmp addr,errno=%d\n", e);
1130 ifa_free(&public_ifa6->ia_ifa);
1138 * Remove prefix and default router list entries corresponding to ifp. Neighbor
1139 * cache entries are freed in in6_domifdetach().
1142 nd6_purge(struct ifnet *ifp)
1144 struct nd_drhead drq;
1145 struct nd_prhead prl;
1146 struct nd_defrouter *dr, *ndr;
1147 struct nd_prefix *pr, *npr;
1153 * Nuke default router list entries toward ifp.
1154 * We defer removal of default router list entries that is installed
1155 * in the routing table, in order to keep additional side effects as
1156 * small as possible.
1159 TAILQ_FOREACH_SAFE(dr, &V_nd_defrouter, dr_entry, ndr) {
1163 defrouter_unlink(dr, &drq);
1165 TAILQ_FOREACH_SAFE(dr, &V_nd_defrouter, dr_entry, ndr) {
1169 defrouter_unlink(dr, &drq);
1173 * Remove prefixes on ifp. We should have already removed addresses on
1174 * this interface, so no addresses should be referencing these prefixes.
1176 LIST_FOREACH_SAFE(pr, &V_nd_prefix, ndpr_entry, npr) {
1177 if (pr->ndpr_ifp == ifp)
1178 nd6_prefix_unlink(pr, &prl);
1182 /* Delete the unlinked router and prefix objects. */
1183 while ((dr = TAILQ_FIRST(&drq)) != NULL) {
1184 TAILQ_REMOVE(&drq, dr, dr_entry);
1187 while ((pr = LIST_FIRST(&prl)) != NULL) {
1188 LIST_REMOVE(pr, ndpr_entry);
1192 /* cancel default outgoing interface setting */
1193 if (V_nd6_defifindex == ifp->if_index)
1194 nd6_setdefaultiface(0);
1196 if (ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV) {
1197 /* Refresh default router list. */
1198 defrouter_select_fib(ifp->if_fib);
1203 * the caller acquires and releases the lock on the lltbls
1204 * Returns the llentry locked
1207 nd6_lookup(const struct in6_addr *addr6, int flags, struct ifnet *ifp)
1209 struct sockaddr_in6 sin6;
1212 bzero(&sin6, sizeof(sin6));
1213 sin6.sin6_len = sizeof(struct sockaddr_in6);
1214 sin6.sin6_family = AF_INET6;
1215 sin6.sin6_addr = *addr6;
1217 IF_AFDATA_LOCK_ASSERT(ifp);
1219 ln = lla_lookup(LLTABLE6(ifp), flags, (struct sockaddr *)&sin6);
1225 nd6_alloc(const struct in6_addr *addr6, int flags, struct ifnet *ifp)
1227 struct sockaddr_in6 sin6;
1230 bzero(&sin6, sizeof(sin6));
1231 sin6.sin6_len = sizeof(struct sockaddr_in6);
1232 sin6.sin6_family = AF_INET6;
1233 sin6.sin6_addr = *addr6;
1235 ln = lltable_alloc_entry(LLTABLE6(ifp), 0, (struct sockaddr *)&sin6);
1237 ln->ln_state = ND6_LLINFO_NOSTATE;
1243 * Test whether a given IPv6 address is a neighbor or not, ignoring
1244 * the actual neighbor cache. The neighbor cache is ignored in order
1245 * to not reenter the routing code from within itself.
1248 nd6_is_new_addr_neighbor(const struct sockaddr_in6 *addr, struct ifnet *ifp)
1250 struct nd_prefix *pr;
1252 struct rt_addrinfo info;
1253 struct sockaddr_in6 rt_key;
1254 const struct sockaddr *dst6;
1259 * A link-local address is always a neighbor.
1260 * XXX: a link does not necessarily specify a single interface.
1262 if (IN6_IS_ADDR_LINKLOCAL(&addr->sin6_addr)) {
1263 struct sockaddr_in6 sin6_copy;
1267 * We need sin6_copy since sa6_recoverscope() may modify the
1271 if (sa6_recoverscope(&sin6_copy))
1272 return (0); /* XXX: should be impossible */
1273 if (in6_setscope(&sin6_copy.sin6_addr, ifp, &zone))
1275 if (sin6_copy.sin6_scope_id == zone)
1281 bzero(&rt_key, sizeof(rt_key));
1282 bzero(&info, sizeof(info));
1283 info.rti_info[RTAX_DST] = (struct sockaddr *)&rt_key;
1286 * If the address matches one of our addresses,
1287 * it should be a neighbor.
1288 * If the address matches one of our on-link prefixes, it should be a
1293 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
1294 if (pr->ndpr_ifp != ifp)
1297 if ((pr->ndpr_stateflags & NDPRF_ONLINK) == 0) {
1298 dst6 = (const struct sockaddr *)&pr->ndpr_prefix;
1301 * We only need to check all FIBs if add_addr_allfibs
1302 * is unset. If set, checking any FIB will suffice.
1304 fibnum = V_rt_add_addr_allfibs ? rt_numfibs - 1 : 0;
1305 for (; fibnum < rt_numfibs; fibnum++) {
1306 genid = V_nd6_list_genid;
1310 * Restore length field before
1313 rt_key.sin6_len = sizeof(rt_key);
1314 error = rib_lookup_info(fibnum, dst6, 0, 0,
1318 if (genid != V_nd6_list_genid)
1327 * This is the case where multiple interfaces
1328 * have the same prefix, but only one is installed
1329 * into the routing table and that prefix entry
1330 * is not the one being examined here. In the case
1331 * where RADIX_MPATH is enabled, multiple route
1332 * entries (of the same rt_key value) will be
1333 * installed because the interface addresses all
1336 if (!IN6_ARE_ADDR_EQUAL(&pr->ndpr_prefix.sin6_addr,
1341 if (IN6_ARE_MASKED_ADDR_EQUAL(&pr->ndpr_prefix.sin6_addr,
1342 &addr->sin6_addr, &pr->ndpr_mask)) {
1350 * If the address is assigned on the node of the other side of
1351 * a p2p interface, the address should be a neighbor.
1353 if (ifp->if_flags & IFF_POINTOPOINT) {
1354 struct epoch_tracker et;
1356 NET_EPOCH_ENTER(et);
1357 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1358 if (ifa->ifa_addr->sa_family != addr->sin6_family)
1360 if (ifa->ifa_dstaddr != NULL &&
1361 sa_equal(addr, ifa->ifa_dstaddr)) {
1370 * If the default router list is empty, all addresses are regarded
1371 * as on-link, and thus, as a neighbor.
1373 if (ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV &&
1374 TAILQ_EMPTY(&V_nd_defrouter) &&
1375 V_nd6_defifindex == ifp->if_index) {
1384 * Detect if a given IPv6 address identifies a neighbor on a given link.
1385 * XXX: should take care of the destination of a p2p link?
1388 nd6_is_addr_neighbor(const struct sockaddr_in6 *addr, struct ifnet *ifp)
1390 struct epoch_tracker et;
1391 struct llentry *lle;
1394 IF_AFDATA_UNLOCK_ASSERT(ifp);
1395 if (nd6_is_new_addr_neighbor(addr, ifp))
1399 * Even if the address matches none of our addresses, it might be
1400 * in the neighbor cache.
1402 NET_EPOCH_ENTER(et);
1403 if ((lle = nd6_lookup(&addr->sin6_addr, 0, ifp)) != NULL) {
1412 * Free an nd6 llinfo entry.
1413 * Since the function would cause significant changes in the kernel, DO NOT
1414 * make it global, unless you have a strong reason for the change, and are sure
1415 * that the change is safe.
1417 * Set noinline to be dtrace-friendly
1419 static __noinline void
1420 nd6_free(struct llentry **lnp, int gc)
1424 struct nd_defrouter *dr;
1429 LLE_WLOCK_ASSERT(ln);
1432 ifp = lltable_get_ifp(ln->lle_tbl);
1433 if ((ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV) != 0)
1434 dr = defrouter_lookup_locked(&ln->r_l3addr.addr6, ifp);
1439 if ((ln->la_flags & LLE_DELETED) == 0)
1440 EVENTHANDLER_INVOKE(lle_event, ln, LLENTRY_EXPIRED);
1443 * we used to have pfctlinput(PRC_HOSTDEAD) here.
1444 * even though it is not harmful, it was not really necessary.
1448 nd6_llinfo_settimer_locked(ln, -1);
1450 if (ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV) {
1451 if (dr != NULL && dr->expire &&
1452 ln->ln_state == ND6_LLINFO_STALE && gc) {
1454 * If the reason for the deletion is just garbage
1455 * collection, and the neighbor is an active default
1456 * router, do not delete it. Instead, reset the GC
1457 * timer using the router's lifetime.
1458 * Simply deleting the entry would affect default
1459 * router selection, which is not necessarily a good
1460 * thing, especially when we're using router preference
1462 * XXX: the check for ln_state would be redundant,
1463 * but we intentionally keep it just in case.
1465 if (dr->expire > time_uptime)
1466 nd6_llinfo_settimer_locked(ln,
1467 (dr->expire - time_uptime) * hz);
1469 nd6_llinfo_settimer_locked(ln,
1470 (long)V_nd6_gctimer * hz);
1480 * Unreachablity of a router might affect the default
1481 * router selection and on-link detection of advertised
1486 * Temporarily fake the state to choose a new default
1487 * router and to perform on-link determination of
1488 * prefixes correctly.
1489 * Below the state will be set correctly,
1490 * or the entry itself will be deleted.
1492 ln->ln_state = ND6_LLINFO_INCOMPLETE;
1495 if (ln->ln_router || dr) {
1498 * We need to unlock to avoid a LOR with rt6_flush() with the
1499 * rnh and for the calls to pfxlist_onlink_check() and
1500 * defrouter_select_fib() in the block further down for calls
1501 * into nd6_lookup(). We still hold a ref.
1506 * rt6_flush must be called whether or not the neighbor
1507 * is in the Default Router List.
1508 * See a corresponding comment in nd6_na_input().
1510 rt6_flush(&ln->r_l3addr.addr6, ifp);
1515 * Since defrouter_select_fib() does not affect the
1516 * on-link determination and MIP6 needs the check
1517 * before the default router selection, we perform
1520 pfxlist_onlink_check();
1523 * Refresh default router list.
1525 defrouter_select_fib(dr->ifp->if_fib);
1529 * If this entry was added by an on-link redirect, remove the
1530 * corresponding host route.
1532 if (ln->la_flags & LLE_REDIRECT)
1533 nd6_free_redirect(ln);
1535 if (ln->ln_router || dr)
1540 * Save to unlock. We still hold an extra reference and will not
1541 * free(9) in llentry_free() if someone else holds one as well.
1544 IF_AFDATA_LOCK(ifp);
1546 /* Guard against race with other llentry_free(). */
1547 if (ln->la_flags & LLE_LINKED) {
1548 /* Remove callout reference */
1550 lltable_unlink_entry(ln->lle_tbl, ln);
1552 IF_AFDATA_UNLOCK(ifp);
1560 nd6_isdynrte(const struct rtentry *rt, void *xap)
1563 if (rt->rt_flags == (RTF_UP | RTF_HOST | RTF_DYNAMIC))
1569 * Remove the rtentry for the given llentry,
1570 * both of which were installed by a redirect.
1573 nd6_free_redirect(const struct llentry *ln)
1576 struct sockaddr_in6 sin6;
1577 struct rt_addrinfo info;
1579 lltable_fill_sa_entry(ln, (struct sockaddr *)&sin6);
1580 memset(&info, 0, sizeof(info));
1581 info.rti_info[RTAX_DST] = (struct sockaddr *)&sin6;
1582 info.rti_filter = nd6_isdynrte;
1584 for (fibnum = 0; fibnum < rt_numfibs; fibnum++)
1585 rtrequest1_fib(RTM_DELETE, &info, NULL, fibnum);
1589 * Rejuvenate this function for routing operations related
1593 nd6_rtrequest(int req, struct rtentry *rt, struct rt_addrinfo *info)
1595 struct sockaddr_in6 *gateway;
1596 struct nd_defrouter *dr;
1599 gateway = (struct sockaddr_in6 *)rt->rt_gateway;
1610 * Only indirect routes are interesting.
1612 if ((rt->rt_flags & RTF_GATEWAY) == 0)
1615 * check for default route
1617 if (IN6_ARE_ADDR_EQUAL(&in6addr_any,
1618 &SIN6(rt_key(rt))->sin6_addr)) {
1619 dr = defrouter_lookup(&gateway->sin6_addr, ifp);
1631 nd6_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp)
1633 struct in6_ndireq *ndi = (struct in6_ndireq *)data;
1634 struct in6_nbrinfo *nbi = (struct in6_nbrinfo *)data;
1635 struct in6_ndifreq *ndif = (struct in6_ndifreq *)data;
1636 struct epoch_tracker et;
1639 if (ifp->if_afdata[AF_INET6] == NULL)
1640 return (EPFNOSUPPORT);
1642 case OSIOCGIFINFO_IN6:
1644 /* XXX: old ndp(8) assumes a positive value for linkmtu. */
1645 bzero(&ND, sizeof(ND));
1646 ND.linkmtu = IN6_LINKMTU(ifp);
1647 ND.maxmtu = ND_IFINFO(ifp)->maxmtu;
1648 ND.basereachable = ND_IFINFO(ifp)->basereachable;
1649 ND.reachable = ND_IFINFO(ifp)->reachable;
1650 ND.retrans = ND_IFINFO(ifp)->retrans;
1651 ND.flags = ND_IFINFO(ifp)->flags;
1652 ND.recalctm = ND_IFINFO(ifp)->recalctm;
1653 ND.chlim = ND_IFINFO(ifp)->chlim;
1655 case SIOCGIFINFO_IN6:
1656 ND = *ND_IFINFO(ifp);
1658 case SIOCSIFINFO_IN6:
1660 * used to change host variables from userland.
1661 * intended for a use on router to reflect RA configurations.
1663 /* 0 means 'unspecified' */
1664 if (ND.linkmtu != 0) {
1665 if (ND.linkmtu < IPV6_MMTU ||
1666 ND.linkmtu > IN6_LINKMTU(ifp)) {
1670 ND_IFINFO(ifp)->linkmtu = ND.linkmtu;
1673 if (ND.basereachable != 0) {
1674 int obasereachable = ND_IFINFO(ifp)->basereachable;
1676 ND_IFINFO(ifp)->basereachable = ND.basereachable;
1677 if (ND.basereachable != obasereachable)
1678 ND_IFINFO(ifp)->reachable =
1679 ND_COMPUTE_RTIME(ND.basereachable);
1681 if (ND.retrans != 0)
1682 ND_IFINFO(ifp)->retrans = ND.retrans;
1684 ND_IFINFO(ifp)->chlim = ND.chlim;
1686 case SIOCSIFINFO_FLAGS:
1689 struct in6_ifaddr *ia;
1691 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) &&
1692 !(ND.flags & ND6_IFF_IFDISABLED)) {
1693 /* ifdisabled 1->0 transision */
1696 * If the interface is marked as ND6_IFF_IFDISABLED and
1697 * has an link-local address with IN6_IFF_DUPLICATED,
1698 * do not clear ND6_IFF_IFDISABLED.
1699 * See RFC 4862, Section 5.4.5.
1701 NET_EPOCH_ENTER(et);
1702 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1703 if (ifa->ifa_addr->sa_family != AF_INET6)
1705 ia = (struct in6_ifaddr *)ifa;
1706 if ((ia->ia6_flags & IN6_IFF_DUPLICATED) &&
1707 IN6_IS_ADDR_LINKLOCAL(IA6_IN6(ia)))
1713 /* LLA is duplicated. */
1714 ND.flags |= ND6_IFF_IFDISABLED;
1715 log(LOG_ERR, "Cannot enable an interface"
1716 " with a link-local address marked"
1719 ND_IFINFO(ifp)->flags &= ~ND6_IFF_IFDISABLED;
1720 if (ifp->if_flags & IFF_UP)
1723 } else if (!(ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) &&
1724 (ND.flags & ND6_IFF_IFDISABLED)) {
1725 /* ifdisabled 0->1 transision */
1726 /* Mark all IPv6 address as tentative. */
1728 ND_IFINFO(ifp)->flags |= ND6_IFF_IFDISABLED;
1729 if (V_ip6_dad_count > 0 &&
1730 (ND_IFINFO(ifp)->flags & ND6_IFF_NO_DAD) == 0) {
1731 NET_EPOCH_ENTER(et);
1732 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead,
1734 if (ifa->ifa_addr->sa_family !=
1737 ia = (struct in6_ifaddr *)ifa;
1738 ia->ia6_flags |= IN6_IFF_TENTATIVE;
1744 if (ND.flags & ND6_IFF_AUTO_LINKLOCAL) {
1745 if (!(ND_IFINFO(ifp)->flags & ND6_IFF_AUTO_LINKLOCAL)) {
1746 /* auto_linklocal 0->1 transision */
1748 /* If no link-local address on ifp, configure */
1749 ND_IFINFO(ifp)->flags |= ND6_IFF_AUTO_LINKLOCAL;
1750 in6_ifattach(ifp, NULL);
1751 } else if (!(ND.flags & ND6_IFF_IFDISABLED) &&
1752 ifp->if_flags & IFF_UP) {
1754 * When the IF already has
1755 * ND6_IFF_AUTO_LINKLOCAL, no link-local
1756 * address is assigned, and IFF_UP, try to
1759 NET_EPOCH_ENTER(et);
1760 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead,
1762 if (ifa->ifa_addr->sa_family !=
1765 ia = (struct in6_ifaddr *)ifa;
1766 if (IN6_IS_ADDR_LINKLOCAL(IA6_IN6(ia)))
1771 /* No LLA is configured. */
1772 in6_ifattach(ifp, NULL);
1776 ND_IFINFO(ifp)->flags = ND.flags;
1779 case SIOCSNDFLUSH_IN6: /* XXX: the ioctl name is confusing... */
1780 /* sync kernel routing table with the default router list */
1784 case SIOCSPFXFLUSH_IN6:
1786 /* flush all the prefix advertised by routers */
1787 struct in6_ifaddr *ia, *ia_next;
1788 struct nd_prefix *pr, *next;
1789 struct nd_prhead prl;
1794 LIST_FOREACH_SAFE(pr, &V_nd_prefix, ndpr_entry, next) {
1795 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
1797 nd6_prefix_unlink(pr, &prl);
1801 while ((pr = LIST_FIRST(&prl)) != NULL) {
1802 LIST_REMOVE(pr, ndpr_entry);
1803 /* XXXRW: in6_ifaddrhead locking. */
1804 CK_STAILQ_FOREACH_SAFE(ia, &V_in6_ifaddrhead, ia_link,
1806 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) == 0)
1809 if (ia->ia6_ndpr == pr)
1810 in6_purgeaddr(&ia->ia_ifa);
1816 case SIOCSRTRFLUSH_IN6:
1818 /* flush all the default routers */
1819 struct nd_drhead drq;
1820 struct nd_defrouter *dr;
1827 while ((dr = TAILQ_FIRST(&V_nd_defrouter)) != NULL)
1828 defrouter_unlink(dr, &drq);
1830 while ((dr = TAILQ_FIRST(&drq)) != NULL) {
1831 TAILQ_REMOVE(&drq, dr, dr_entry);
1838 case SIOCGNBRINFO_IN6:
1841 struct in6_addr nb_addr = nbi->addr; /* make local for safety */
1843 if ((error = in6_setscope(&nb_addr, ifp, NULL)) != 0)
1846 NET_EPOCH_ENTER(et);
1847 ln = nd6_lookup(&nb_addr, 0, ifp);
1854 nbi->state = ln->ln_state;
1855 nbi->asked = ln->la_asked;
1856 nbi->isrouter = ln->ln_router;
1857 if (ln->la_expire == 0)
1860 nbi->expire = ln->la_expire + ln->lle_remtime / hz +
1861 (time_second - time_uptime);
1865 case SIOCGDEFIFACE_IN6: /* XXX: should be implemented as a sysctl? */
1866 ndif->ifindex = V_nd6_defifindex;
1868 case SIOCSDEFIFACE_IN6: /* XXX: should be implemented as a sysctl? */
1869 return (nd6_setdefaultiface(ndif->ifindex));
1875 * Calculates new isRouter value based on provided parameters and
1879 nd6_is_router(int type, int code, int is_new, int old_addr, int new_addr,
1884 * ICMP6 type dependent behavior.
1886 * NS: clear IsRouter if new entry
1887 * RS: clear IsRouter
1888 * RA: set IsRouter if there's lladdr
1889 * redir: clear IsRouter if new entry
1892 * The spec says that we must set IsRouter in the following cases:
1893 * - If lladdr exist, set IsRouter. This means (1-5).
1894 * - If it is old entry (!newentry), set IsRouter. This means (7).
1895 * So, based on the spec, in (1-5) and (7) cases we must set IsRouter.
1896 * A quetion arises for (1) case. (1) case has no lladdr in the
1897 * neighbor cache, this is similar to (6).
1898 * This case is rare but we figured that we MUST NOT set IsRouter.
1900 * is_new old_addr new_addr NS RS RA redir
1907 * 1 -- n (6) c c c s
1908 * 1 -- y (7) c c s c s
1912 switch (type & 0xff) {
1913 case ND_NEIGHBOR_SOLICIT:
1915 * New entry must have is_router flag cleared.
1917 if (is_new) /* (6-7) */
1922 * If the icmp is a redirect to a better router, always set the
1923 * is_router flag. Otherwise, if the entry is newly created,
1924 * clear the flag. [RFC 2461, sec 8.3]
1926 if (code == ND_REDIRECT_ROUTER)
1929 if (is_new) /* (6-7) */
1933 case ND_ROUTER_SOLICIT:
1935 * is_router flag must always be cleared.
1939 case ND_ROUTER_ADVERT:
1941 * Mark an entry with lladdr as a router.
1943 if ((!is_new && (old_addr || new_addr)) || /* (2-5) */
1944 (is_new && new_addr)) { /* (7) */
1954 * Create neighbor cache entry and cache link-layer address,
1955 * on reception of inbound ND6 packets. (RS/RA/NS/redirect)
1958 * code - type dependent information
1962 nd6_cache_lladdr(struct ifnet *ifp, struct in6_addr *from, char *lladdr,
1963 int lladdrlen, int type, int code)
1965 struct llentry *ln = NULL, *ln_tmp;
1971 uint16_t router = 0;
1972 struct sockaddr_in6 sin6;
1973 struct epoch_tracker et;
1974 struct mbuf *chain = NULL;
1975 u_char linkhdr[LLE_MAX_LINKHDR];
1979 IF_AFDATA_UNLOCK_ASSERT(ifp);
1981 KASSERT(ifp != NULL, ("%s: ifp == NULL", __func__));
1982 KASSERT(from != NULL, ("%s: from == NULL", __func__));
1984 /* nothing must be updated for unspecified address */
1985 if (IN6_IS_ADDR_UNSPECIFIED(from))
1989 * Validation about ifp->if_addrlen and lladdrlen must be done in
1992 * XXX If the link does not have link-layer adderss, what should
1993 * we do? (ifp->if_addrlen == 0)
1994 * Spec says nothing in sections for RA, RS and NA. There's small
1995 * description on it in NS section (RFC 2461 7.2.3).
1997 flags = lladdr ? LLE_EXCLUSIVE : 0;
1998 NET_EPOCH_ENTER(et);
1999 ln = nd6_lookup(from, flags, ifp);
2003 flags |= LLE_EXCLUSIVE;
2004 ln = nd6_alloc(from, 0, ifp);
2009 * Since we already know all the data for the new entry,
2010 * fill it before insertion.
2012 if (lladdr != NULL) {
2013 linkhdrsize = sizeof(linkhdr);
2014 if (lltable_calc_llheader(ifp, AF_INET6, lladdr,
2015 linkhdr, &linkhdrsize, &lladdr_off) != 0)
2017 lltable_set_entry_addr(ifp, ln, linkhdr, linkhdrsize,
2021 IF_AFDATA_WLOCK(ifp);
2023 /* Prefer any existing lle over newly-created one */
2024 ln_tmp = nd6_lookup(from, LLE_EXCLUSIVE, ifp);
2026 lltable_link_entry(LLTABLE6(ifp), ln);
2027 IF_AFDATA_WUNLOCK(ifp);
2028 if (ln_tmp == NULL) {
2029 /* No existing lle, mark as new entry (6,7) */
2031 if (lladdr != NULL) { /* (7) */
2032 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE);
2033 EVENTHANDLER_INVOKE(lle_event, ln,
2037 lltable_free_entry(LLTABLE6(ifp), ln);
2042 /* do nothing if static ndp is set */
2043 if ((ln->la_flags & LLE_STATIC)) {
2044 if (flags & LLE_EXCLUSIVE)
2051 olladdr = (ln->la_flags & LLE_VALID) ? 1 : 0;
2052 if (olladdr && lladdr) {
2053 llchange = bcmp(lladdr, ln->ll_addr,
2055 } else if (!olladdr && lladdr)
2061 * newentry olladdr lladdr llchange (*=record)
2064 * 0 n y y (3) * STALE
2066 * 0 y y y (5) * STALE
2067 * 1 -- n -- (6) NOSTATE(= PASSIVE)
2068 * 1 -- y -- (7) * STALE
2072 if (is_newentry == 0 && llchange != 0) {
2073 do_update = 1; /* (3,5) */
2076 * Record source link-layer address
2077 * XXX is it dependent to ifp->if_type?
2079 linkhdrsize = sizeof(linkhdr);
2080 if (lltable_calc_llheader(ifp, AF_INET6, lladdr,
2081 linkhdr, &linkhdrsize, &lladdr_off) != 0)
2084 if (lltable_try_set_entry_addr(ifp, ln, linkhdr, linkhdrsize,
2086 /* Entry was deleted */
2090 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE);
2092 EVENTHANDLER_INVOKE(lle_event, ln, LLENTRY_RESOLVED);
2094 if (ln->la_hold != NULL)
2095 nd6_grab_holdchain(ln, &chain, &sin6);
2098 /* Calculates new router status */
2099 router = nd6_is_router(type, code, is_newentry, olladdr,
2100 lladdr != NULL ? 1 : 0, ln->ln_router);
2102 ln->ln_router = router;
2103 /* Mark non-router redirects with special flag */
2104 if ((type & 0xFF) == ND_REDIRECT && code != ND_REDIRECT_ROUTER)
2105 ln->la_flags |= LLE_REDIRECT;
2107 if (flags & LLE_EXCLUSIVE)
2113 nd6_flush_holdchain(ifp, chain, &sin6);
2116 * When the link-layer address of a router changes, select the
2117 * best router again. In particular, when the neighbor entry is newly
2118 * created, it might affect the selection policy.
2119 * Question: can we restrict the first condition to the "is_newentry"
2121 * XXX: when we hear an RA from a new router with the link-layer
2122 * address option, defrouter_select_fib() is called twice, since
2123 * defrtrlist_update called the function as well. However, I believe
2124 * we can compromise the overhead, since it only happens the first
2126 * XXX: although defrouter_select_fib() should not have a bad effect
2127 * for those are not autoconfigured hosts, we explicitly avoid such
2130 if ((do_update || is_newentry) && router &&
2131 ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV) {
2133 * guaranteed recursion
2135 defrouter_select_fib(ifp->if_fib);
2140 nd6_slowtimo(void *arg)
2142 struct epoch_tracker et;
2143 CURVNET_SET((struct vnet *) arg);
2144 struct nd_ifinfo *nd6if;
2147 callout_reset(&V_nd6_slowtimo_ch, ND6_SLOWTIMER_INTERVAL * hz,
2148 nd6_slowtimo, curvnet);
2149 NET_EPOCH_ENTER(et);
2150 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
2151 if (ifp->if_afdata[AF_INET6] == NULL)
2153 nd6if = ND_IFINFO(ifp);
2154 if (nd6if->basereachable && /* already initialized */
2155 (nd6if->recalctm -= ND6_SLOWTIMER_INTERVAL) <= 0) {
2157 * Since reachable time rarely changes by router
2158 * advertisements, we SHOULD insure that a new random
2159 * value gets recomputed at least once every few hours.
2162 nd6if->recalctm = V_nd6_recalc_reachtm_interval;
2163 nd6if->reachable = ND_COMPUTE_RTIME(nd6if->basereachable);
2171 nd6_grab_holdchain(struct llentry *ln, struct mbuf **chain,
2172 struct sockaddr_in6 *sin6)
2175 LLE_WLOCK_ASSERT(ln);
2177 *chain = ln->la_hold;
2179 lltable_fill_sa_entry(ln, (struct sockaddr *)sin6);
2181 if (ln->ln_state == ND6_LLINFO_STALE) {
2184 * The first time we send a packet to a
2185 * neighbor whose entry is STALE, we have
2186 * to change the state to DELAY and a sets
2187 * a timer to expire in DELAY_FIRST_PROBE_TIME
2188 * seconds to ensure do neighbor unreachability
2189 * detection on expiration.
2192 nd6_llinfo_setstate(ln, ND6_LLINFO_DELAY);
2197 nd6_output_ifp(struct ifnet *ifp, struct ifnet *origifp, struct mbuf *m,
2198 struct sockaddr_in6 *dst, struct route *ro)
2202 struct ip6_hdr *ip6;
2206 mac_netinet6_nd6_send(ifp, m);
2210 * If called from nd6_ns_output() (NS), nd6_na_output() (NA),
2211 * icmp6_redirect_output() (REDIRECT) or from rip6_output() (RS, RA
2212 * as handled by rtsol and rtadvd), mbufs will be tagged for SeND
2213 * to be diverted to user space. When re-injected into the kernel,
2214 * send_output() will directly dispatch them to the outgoing interface.
2216 if (send_sendso_input_hook != NULL) {
2217 mtag = m_tag_find(m, PACKET_TAG_ND_OUTGOING, NULL);
2219 ip6 = mtod(m, struct ip6_hdr *);
2220 ip6len = sizeof(struct ip6_hdr) + ntohs(ip6->ip6_plen);
2221 /* Use the SEND socket */
2222 error = send_sendso_input_hook(m, ifp, SND_OUT,
2224 /* -1 == no app on SEND socket */
2225 if (error == 0 || error != -1)
2230 m_clrprotoflags(m); /* Avoid confusing lower layers. */
2231 IP_PROBE(send, NULL, NULL, mtod(m, struct ip6_hdr *), ifp, NULL,
2232 mtod(m, struct ip6_hdr *));
2234 if ((ifp->if_flags & IFF_LOOPBACK) == 0)
2237 error = (*ifp->if_output)(origifp, m, (struct sockaddr *)dst, ro);
2242 * Lookup link headerfor @sa_dst address. Stores found
2243 * data in @desten buffer. Copy of lle ln_flags can be also
2244 * saved in @pflags if @pflags is non-NULL.
2246 * If destination LLE does not exists or lle state modification
2247 * is required, call "slow" version.
2250 * - 0 on success (address copied to buffer).
2251 * - EWOULDBLOCK (no local error, but address is still unresolved)
2252 * - other errors (alloc failure, etc)
2255 nd6_resolve(struct ifnet *ifp, int is_gw, struct mbuf *m,
2256 const struct sockaddr *sa_dst, u_char *desten, uint32_t *pflags,
2257 struct llentry **plle)
2259 struct epoch_tracker et;
2260 struct llentry *ln = NULL;
2261 const struct sockaddr_in6 *dst6;
2266 dst6 = (const struct sockaddr_in6 *)sa_dst;
2268 /* discard the packet if IPv6 operation is disabled on the interface */
2269 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)) {
2271 return (ENETDOWN); /* better error? */
2274 if (m != NULL && m->m_flags & M_MCAST) {
2275 switch (ifp->if_type) {
2279 ETHER_MAP_IPV6_MULTICAST(&dst6->sin6_addr,
2284 return (EAFNOSUPPORT);
2288 NET_EPOCH_ENTER(et);
2289 ln = nd6_lookup(&dst6->sin6_addr, plle ? LLE_EXCLUSIVE : LLE_UNLOCKED,
2291 if (ln != NULL && (ln->r_flags & RLLE_VALID) != 0) {
2292 /* Entry found, let's copy lle info */
2293 bcopy(ln->r_linkdata, desten, ln->r_hdrlen);
2295 *pflags = LLE_VALID | (ln->r_flags & RLLE_IFADDR);
2296 /* Check if we have feedback request from nd6 timer */
2297 if (ln->r_skip_req != 0) {
2299 ln->r_skip_req = 0; /* Notify that entry was used */
2300 ln->lle_hittime = time_uptime;
2310 } else if (plle && ln)
2314 return (nd6_resolve_slow(ifp, 0, m, dst6, desten, pflags, plle));
2319 * Do L2 address resolution for @sa_dst address. Stores found
2320 * address in @desten buffer. Copy of lle ln_flags can be also
2321 * saved in @pflags if @pflags is non-NULL.
2324 * Function assume that destination LLE does not exist,
2325 * is invalid or stale, so LLE_EXCLUSIVE lock needs to be acquired.
2327 * Set noinline to be dtrace-friendly
2329 static __noinline int
2330 nd6_resolve_slow(struct ifnet *ifp, int flags, struct mbuf *m,
2331 const struct sockaddr_in6 *dst, u_char *desten, uint32_t *pflags,
2332 struct llentry **plle)
2334 struct llentry *lle = NULL, *lle_tmp;
2335 struct in6_addr *psrc, src;
2336 int send_ns, ll_len;
2340 * Address resolution or Neighbor Unreachability Detection
2342 * At this point, the destination of the packet must be a unicast
2343 * or an anycast address(i.e. not a multicast).
2346 struct epoch_tracker et;
2348 NET_EPOCH_ENTER(et);
2349 lle = nd6_lookup(&dst->sin6_addr, LLE_EXCLUSIVE, ifp);
2351 if ((lle == NULL) && nd6_is_addr_neighbor(dst, ifp)) {
2353 * Since nd6_is_addr_neighbor() internally calls nd6_lookup(),
2354 * the condition below is not very efficient. But we believe
2355 * it is tolerable, because this should be a rare case.
2357 lle = nd6_alloc(&dst->sin6_addr, 0, ifp);
2359 char ip6buf[INET6_ADDRSTRLEN];
2361 "nd6_output: can't allocate llinfo for %s "
2363 ip6_sprintf(ip6buf, &dst->sin6_addr), lle);
2368 IF_AFDATA_WLOCK(ifp);
2370 /* Prefer any existing entry over newly-created one */
2371 lle_tmp = nd6_lookup(&dst->sin6_addr, LLE_EXCLUSIVE, ifp);
2372 if (lle_tmp == NULL)
2373 lltable_link_entry(LLTABLE6(ifp), lle);
2374 IF_AFDATA_WUNLOCK(ifp);
2375 if (lle_tmp != NULL) {
2376 lltable_free_entry(LLTABLE6(ifp), lle);
2383 if (!(ND_IFINFO(ifp)->flags & ND6_IFF_PERFORMNUD)) {
2393 LLE_WLOCK_ASSERT(lle);
2396 * The first time we send a packet to a neighbor whose entry is
2397 * STALE, we have to change the state to DELAY and a sets a timer to
2398 * expire in DELAY_FIRST_PROBE_TIME seconds to ensure do
2399 * neighbor unreachability detection on expiration.
2402 if (lle->ln_state == ND6_LLINFO_STALE)
2403 nd6_llinfo_setstate(lle, ND6_LLINFO_DELAY);
2406 * If the neighbor cache entry has a state other than INCOMPLETE
2407 * (i.e. its link-layer address is already resolved), just
2410 if (lle->ln_state > ND6_LLINFO_INCOMPLETE) {
2411 if (flags & LLE_ADDRONLY) {
2412 lladdr = lle->ll_addr;
2413 ll_len = ifp->if_addrlen;
2415 lladdr = lle->r_linkdata;
2416 ll_len = lle->r_hdrlen;
2418 bcopy(lladdr, desten, ll_len);
2420 *pflags = lle->la_flags;
2430 * There is a neighbor cache entry, but no ethernet address
2431 * response yet. Append this latest packet to the end of the
2432 * packet queue in the mbuf. When it exceeds nd6_maxqueuelen,
2433 * the oldest packet in the queue will be removed.
2436 if (lle->la_hold != NULL) {
2437 struct mbuf *m_hold;
2441 for (m_hold = lle->la_hold; m_hold; m_hold = m_hold->m_nextpkt){
2443 if (m_hold->m_nextpkt == NULL) {
2444 m_hold->m_nextpkt = m;
2448 while (i >= V_nd6_maxqueuelen) {
2449 m_hold = lle->la_hold;
2450 lle->la_hold = lle->la_hold->m_nextpkt;
2459 * If there has been no NS for the neighbor after entering the
2460 * INCOMPLETE state, send the first solicitation.
2461 * Note that for newly-created lle la_asked will be 0,
2462 * so we will transition from ND6_LLINFO_NOSTATE to
2463 * ND6_LLINFO_INCOMPLETE state here.
2467 if (lle->la_asked == 0) {
2470 psrc = nd6_llinfo_get_holdsrc(lle, &src);
2472 nd6_llinfo_setstate(lle, ND6_LLINFO_INCOMPLETE);
2476 nd6_ns_output(ifp, psrc, NULL, &dst->sin6_addr, NULL);
2478 return (EWOULDBLOCK);
2482 * Do L2 address resolution for @sa_dst address. Stores found
2483 * address in @desten buffer. Copy of lle ln_flags can be also
2484 * saved in @pflags if @pflags is non-NULL.
2487 * - 0 on success (address copied to buffer).
2488 * - EWOULDBLOCK (no local error, but address is still unresolved)
2489 * - other errors (alloc failure, etc)
2492 nd6_resolve_addr(struct ifnet *ifp, int flags, const struct sockaddr *dst,
2493 char *desten, uint32_t *pflags)
2497 flags |= LLE_ADDRONLY;
2498 error = nd6_resolve_slow(ifp, flags, NULL,
2499 (const struct sockaddr_in6 *)dst, desten, pflags, NULL);
2504 nd6_flush_holdchain(struct ifnet *ifp, struct mbuf *chain,
2505 struct sockaddr_in6 *dst)
2507 struct mbuf *m, *m_head;
2514 m_head = m_head->m_nextpkt;
2515 error = nd6_output_ifp(ifp, ifp, m, dst, NULL);
2520 * note that intermediate errors are blindly ignored
2526 nd6_need_cache(struct ifnet *ifp)
2529 * XXX: we currently do not make neighbor cache on any interface
2530 * other than Ethernet and GIF.
2533 * - unidirectional tunnels needs no ND
2535 switch (ifp->if_type) {
2539 case IFT_INFINIBAND:
2541 case IFT_PROPVIRTUAL:
2549 * Add pernament ND6 link-layer record for given
2550 * interface address.
2552 * Very similar to IPv4 arp_ifinit(), but:
2553 * 1) IPv6 DAD is performed in different place
2554 * 2) It is called by IPv6 protocol stack in contrast to
2555 * arp_ifinit() which is typically called in SIOCSIFADDR
2556 * driver ioctl handler.
2560 nd6_add_ifa_lle(struct in6_ifaddr *ia)
2563 struct llentry *ln, *ln_tmp;
2564 struct sockaddr *dst;
2566 ifp = ia->ia_ifa.ifa_ifp;
2567 if (nd6_need_cache(ifp) == 0)
2570 ia->ia_ifa.ifa_rtrequest = nd6_rtrequest;
2571 dst = (struct sockaddr *)&ia->ia_addr;
2572 ln = lltable_alloc_entry(LLTABLE6(ifp), LLE_IFADDR, dst);
2576 IF_AFDATA_WLOCK(ifp);
2578 /* Unlink any entry if exists */
2579 ln_tmp = lla_lookup(LLTABLE6(ifp), LLE_EXCLUSIVE, dst);
2581 lltable_unlink_entry(LLTABLE6(ifp), ln_tmp);
2582 lltable_link_entry(LLTABLE6(ifp), ln);
2583 IF_AFDATA_WUNLOCK(ifp);
2586 EVENTHANDLER_INVOKE(lle_event, ln_tmp, LLENTRY_EXPIRED);
2587 EVENTHANDLER_INVOKE(lle_event, ln, LLENTRY_RESOLVED);
2591 llentry_free(ln_tmp);
2597 * Removes either all lle entries for given @ia, or lle
2598 * corresponding to @ia address.
2601 nd6_rem_ifa_lle(struct in6_ifaddr *ia, int all)
2603 struct sockaddr_in6 mask, addr;
2604 struct sockaddr *saddr, *smask;
2607 ifp = ia->ia_ifa.ifa_ifp;
2608 memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr));
2609 memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask));
2610 saddr = (struct sockaddr *)&addr;
2611 smask = (struct sockaddr *)&mask;
2614 lltable_prefix_free(AF_INET6, saddr, smask, LLE_STATIC);
2616 lltable_delete_addr(LLTABLE6(ifp), LLE_IFADDR, saddr);
2620 clear_llinfo_pqueue(struct llentry *ln)
2622 struct mbuf *m_hold, *m_hold_next;
2624 for (m_hold = ln->la_hold; m_hold; m_hold = m_hold_next) {
2625 m_hold_next = m_hold->m_nextpkt;
2632 static int nd6_sysctl_drlist(SYSCTL_HANDLER_ARGS);
2633 static int nd6_sysctl_prlist(SYSCTL_HANDLER_ARGS);
2635 SYSCTL_DECL(_net_inet6_icmp6);
2636 SYSCTL_PROC(_net_inet6_icmp6, ICMPV6CTL_ND6_DRLIST, nd6_drlist,
2637 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE,
2638 NULL, 0, nd6_sysctl_drlist, "S,in6_defrouter",
2639 "NDP default router list");
2640 SYSCTL_PROC(_net_inet6_icmp6, ICMPV6CTL_ND6_PRLIST, nd6_prlist,
2641 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE,
2642 NULL, 0, nd6_sysctl_prlist, "S,in6_prefix",
2644 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_MAXQLEN, nd6_maxqueuelen,
2645 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_maxqueuelen), 1, "");
2646 SYSCTL_INT(_net_inet6_icmp6, OID_AUTO, nd6_gctimer,
2647 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_gctimer), (60 * 60 * 24), "");
2650 nd6_sysctl_drlist(SYSCTL_HANDLER_ARGS)
2652 struct in6_defrouter d;
2653 struct nd_defrouter *dr;
2656 if (req->newptr != NULL)
2659 error = sysctl_wire_old_buffer(req, 0);
2663 bzero(&d, sizeof(d));
2664 d.rtaddr.sin6_family = AF_INET6;
2665 d.rtaddr.sin6_len = sizeof(d.rtaddr);
2668 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) {
2669 d.rtaddr.sin6_addr = dr->rtaddr;
2670 error = sa6_recoverscope(&d.rtaddr);
2673 d.flags = dr->raflags;
2674 d.rtlifetime = dr->rtlifetime;
2675 d.expire = dr->expire + (time_second - time_uptime);
2676 d.if_index = dr->ifp->if_index;
2677 error = SYSCTL_OUT(req, &d, sizeof(d));
2686 nd6_sysctl_prlist(SYSCTL_HANDLER_ARGS)
2688 struct in6_prefix p;
2689 struct sockaddr_in6 s6;
2690 struct nd_prefix *pr;
2691 struct nd_pfxrouter *pfr;
2694 char ip6buf[INET6_ADDRSTRLEN];
2699 error = sysctl_wire_old_buffer(req, 0);
2703 bzero(&p, sizeof(p));
2704 p.origin = PR_ORIG_RA;
2705 bzero(&s6, sizeof(s6));
2706 s6.sin6_family = AF_INET6;
2707 s6.sin6_len = sizeof(s6);
2710 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
2711 p.prefix = pr->ndpr_prefix;
2712 if (sa6_recoverscope(&p.prefix)) {
2713 log(LOG_ERR, "scope error in prefix list (%s)\n",
2714 ip6_sprintf(ip6buf, &p.prefix.sin6_addr));
2715 /* XXX: press on... */
2717 p.raflags = pr->ndpr_raf;
2718 p.prefixlen = pr->ndpr_plen;
2719 p.vltime = pr->ndpr_vltime;
2720 p.pltime = pr->ndpr_pltime;
2721 p.if_index = pr->ndpr_ifp->if_index;
2722 if (pr->ndpr_vltime == ND6_INFINITE_LIFETIME)
2725 /* XXX: we assume time_t is signed. */
2727 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
2728 if (pr->ndpr_vltime < maxexpire - pr->ndpr_lastupdate)
2729 p.expire = pr->ndpr_lastupdate +
2731 (time_second - time_uptime);
2733 p.expire = maxexpire;
2735 p.refcnt = pr->ndpr_addrcnt;
2736 p.flags = pr->ndpr_stateflags;
2738 LIST_FOREACH(pfr, &pr->ndpr_advrtrs, pfr_entry)
2740 error = SYSCTL_OUT(req, &p, sizeof(p));
2743 LIST_FOREACH(pfr, &pr->ndpr_advrtrs, pfr_entry) {
2744 s6.sin6_addr = pfr->router->rtaddr;
2745 if (sa6_recoverscope(&s6))
2747 "scope error in prefix list (%s)\n",
2748 ip6_sprintf(ip6buf, &pfr->router->rtaddr));
2749 error = SYSCTL_OUT(req, &s6, sizeof(s6));