FreeBSD kernel IPv6 code
nd6.c
Go to the documentation of this file.
1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
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.
18 *
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
29 * SUCH DAMAGE.
30 *
31 * $KAME: nd6.c,v 1.144 2001/05/24 07:44:00 itojun Exp $
32 */
33
34#include <sys/cdefs.h>
35__FBSDID("$FreeBSD$");
36
37#include "opt_inet.h"
38#include "opt_inet6.h"
39#include "opt_route.h"
40
41#include <sys/param.h>
42#include <sys/systm.h>
43#include <sys/eventhandler.h>
44#include <sys/callout.h>
45#include <sys/lock.h>
46#include <sys/malloc.h>
47#include <sys/mbuf.h>
48#include <sys/mutex.h>
49#include <sys/socket.h>
50#include <sys/sockio.h>
51#include <sys/time.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>
58#include <sys/sdt.h>
59#include <sys/sysctl.h>
60
61#include <net/if.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>
68#include <net/vnet.h>
69
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>
82
83#include <sys/limits.h>
84
85#include <security/mac/mac_framework.h>
86
87#define ND6_SLOWTIMER_INTERVAL (60 * 60) /* 1 hour */
88#define ND6_RECALC_REACHTM_INTERVAL (60 * 120) /* 2 hours */
89
90#define SIN6(s) ((const struct sockaddr_in6 *)(s))
91
92MALLOC_DEFINE(M_IP6NDP, "ip6ndp", "IPv6 Neighbor Discovery");
93
94/* timer values */
95VNET_DEFINE(int, nd6_prune) = 1; /* walk list every 1 seconds */
96VNET_DEFINE(int, nd6_delay) = 5; /* delay first probe time 5 second */
97VNET_DEFINE(int, nd6_umaxtries) = 3; /* maximum unicast query */
98VNET_DEFINE(int, nd6_mmaxtries) = 3; /* maximum multicast query */
99VNET_DEFINE(int, nd6_useloopback) = 1; /* use loopback interface for
100 * local traffic */
101VNET_DEFINE(int, nd6_gctimer) = (60 * 60 * 24); /* 1 day: garbage
102 * collection timer */
103
104/* preventing too many loops in ND option parsing */
105VNET_DEFINE_STATIC(int, nd6_maxndopt) = 10; /* max # of ND options allowed */
106
107VNET_DEFINE(int, nd6_maxnudhint) = 0; /* max # of subsequent upper
108 * layer hints */
109VNET_DEFINE_STATIC(int, nd6_maxqueuelen) = 16; /* max pkts cached in unresolved
110 * ND entries */
111#define V_nd6_maxndopt VNET(nd6_maxndopt)
112#define V_nd6_maxqueuelen VNET(nd6_maxqueuelen)
113
114#ifdef ND6_DEBUG
115VNET_DEFINE(int, nd6_debug) = 1;
116#else
117VNET_DEFINE(int, nd6_debug) = 0;
118#endif
119
120static eventhandler_tag lle_event_eh, iflladdr_event_eh, ifnet_link_event_eh;
121
122VNET_DEFINE(struct nd_prhead, nd_prefix);
123VNET_DEFINE(struct rwlock, nd6_lock);
124VNET_DEFINE(uint64_t, nd6_list_genid);
125VNET_DEFINE(struct mtx, nd6_onlink_mtx);
126
127VNET_DEFINE(int, nd6_recalc_reachtm_interval) = ND6_RECALC_REACHTM_INTERVAL;
128#define V_nd6_recalc_reachtm_interval VNET(nd6_recalc_reachtm_interval)
129
130int (*send_sendso_input_hook)(struct mbuf *, struct ifnet *, int, int);
131
132static int nd6_is_new_addr_neighbor(const struct sockaddr_in6 *,
133 struct ifnet *);
134static void nd6_setmtu0(struct ifnet *, struct nd_ifinfo *);
135static void nd6_slowtimo(void *);
136static int regen_tmpaddr(struct in6_ifaddr *);
137static void nd6_free(struct llentry **, int);
138static void nd6_free_redirect(const struct llentry *);
139static void nd6_llinfo_timer(void *);
140static void nd6_llinfo_settimer_locked(struct llentry *, long);
141static void clear_llinfo_pqueue(struct llentry *);
142static int nd6_resolve_slow(struct ifnet *, int, int, struct mbuf *,
143 const struct sockaddr_in6 *, u_char *, uint32_t *, struct llentry **);
144static int nd6_need_cache(struct ifnet *);
145
146VNET_DEFINE_STATIC(struct callout, nd6_slowtimo_ch);
147#define V_nd6_slowtimo_ch VNET(nd6_slowtimo_ch)
148
149VNET_DEFINE_STATIC(struct callout, nd6_timer_ch);
150#define V_nd6_timer_ch VNET(nd6_timer_ch)
151
152SYSCTL_DECL(_net_inet6_icmp6);
153
154static void
155nd6_lle_event(void *arg __unused, struct llentry *lle, int evt)
156{
157 struct rt_addrinfo rtinfo;
158 struct sockaddr_in6 dst;
159 struct sockaddr_dl gw;
160 struct ifnet *ifp;
161 int type;
162 int fibnum;
163
164 LLE_WLOCK_ASSERT(lle);
165
166 if (lltable_get_af(lle->lle_tbl) != AF_INET6)
167 return;
168
169 switch (evt) {
170 case LLENTRY_RESOLVED:
171 type = RTM_ADD;
172 KASSERT(lle->la_flags & LLE_VALID,
173 ("%s: %p resolved but not valid?", __func__, lle));
174 break;
175 case LLENTRY_EXPIRED:
176 type = RTM_DELETE;
177 break;
178 default:
179 return;
180 }
181
182 ifp = lltable_get_ifp(lle->lle_tbl);
183
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);
203}
204
205/*
206 * A handler for interface link layer address change event.
207 */
208static void
209nd6_iflladdr(void *arg __unused, struct ifnet *ifp)
210{
211 if (ifp->if_afdata[AF_INET6] == NULL)
212 return;
213
214 lltable_update_ifaddr(LLTABLE6(ifp));
215}
216
217void
218nd6_init(void)
219{
220
221 mtx_init(&V_nd6_onlink_mtx, "nd6 onlink", NULL, MTX_DEF);
222 rw_init(&V_nd6_lock, "nd6 list");
223
224 LIST_INIT(&V_nd_prefix);
225 nd6_defrouter_init();
226
227 /* Start timers. */
228 callout_init(&V_nd6_slowtimo_ch, 1);
229 callout_reset(&V_nd6_slowtimo_ch, ND6_SLOWTIMER_INTERVAL * hz,
230 nd6_slowtimo, curvnet);
231
232 callout_init(&V_nd6_timer_ch, 1);
233 callout_reset(&V_nd6_timer_ch, hz, nd6_timer, curvnet);
234
235 nd6_dad_init();
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);
243 }
244}
245
246#ifdef VIMAGE
247void
248nd6_destroy()
249{
250
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);
257 }
258 rw_destroy(&V_nd6_lock);
259 mtx_destroy(&V_nd6_onlink_mtx);
260}
261#endif
262
263struct nd_ifinfo *
264nd6_ifattach(struct ifnet *ifp)
265{
266 struct nd_ifinfo *nd;
267
268 nd = malloc(sizeof(*nd), M_IP6NDP, M_WAITOK | M_ZERO);
269 nd->initialized = 1;
270
271 nd->chlim = IPV6_DEFHLIM;
272 nd->basereachable = REACHABLE_TIME;
273 nd->reachable = ND_COMPUTE_RTIME(nd->basereachable);
274 nd->retrans = RETRANS_TIMER;
275
276 nd->flags = ND6_IFF_PERFORMNUD;
277
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;
281
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.
286 */
287 if ((V_ip6_auto_linklocal && ifp->if_type != IFT_BRIDGE) ||
288 (ifp->if_flags & IFF_LOOPBACK))
289 nd->flags |= ND6_IFF_AUTO_LINKLOCAL;
290 /*
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.
296 */
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;
303 }
304 if (V_ip6_no_radr && !(ifp->if_flags & IFF_LOOPBACK))
305 nd->flags |= ND6_IFF_NO_RADR;
306
307 /* XXX: we cannot call nd6_setmtu since ifp is not fully initialized */
308 nd6_setmtu0(ifp, nd);
309
310 return nd;
311}
312
313void
314nd6_ifdetach(struct ifnet *ifp, struct nd_ifinfo *nd)
315{
316 struct epoch_tracker et;
317 struct ifaddr *ifa, *next;
318
319 NET_EPOCH_ENTER(et);
320 CK_STAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) {
321 if (ifa->ifa_addr->sa_family != AF_INET6)
322 continue;
323
324 /* stop DAD processing */
325 nd6_dad_stop(ifa);
326 }
327 NET_EPOCH_EXIT(et);
328
329 free(nd, M_IP6NDP);
330}
331
332/*
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.
335 */
336void
337nd6_setmtu(struct ifnet *ifp)
338{
339 if (ifp->if_afdata[AF_INET6] == NULL)
340 return;
341
342 nd6_setmtu0(ifp, ND_IFINFO(ifp));
343}
344
345/* XXX todo: do not maintain copy of ifp->if_mtu in ndi->maxmtu */
346void
347nd6_setmtu0(struct ifnet *ifp, struct nd_ifinfo *ndi)
348{
349 u_int32_t omaxmtu;
350
351 omaxmtu = ndi->maxmtu;
352 ndi->maxmtu = ifp->if_mtu;
353
354 /*
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.
359 */
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);
364 }
365
366 if (ndi->maxmtu > V_in6_maxmtu)
367 in6_setmaxmtu(); /* check all interfaces just in case */
368
369}
370
371void
372nd6_option_init(void *opt, int icmp6len, union nd_opts *ndopts)
373{
374
375 bzero(ndopts, sizeof(*ndopts));
376 ndopts->nd_opts_search = (struct nd_opt_hdr *)opt;
377 ndopts->nd_opts_last
378 = (struct nd_opt_hdr *)(((u_char *)opt) + icmp6len);
379
380 if (icmp6len == 0) {
381 ndopts->nd_opts_done = 1;
382 ndopts->nd_opts_search = NULL;
383 }
384}
385
386/*
387 * Take one ND option.
388 */
389struct nd_opt_hdr *
390nd6_option(union nd_opts *ndopts)
391{
392 struct nd_opt_hdr *nd_opt;
393 int olen;
394
395 KASSERT(ndopts != NULL, ("%s: ndopts == NULL", __func__));
396 KASSERT(ndopts->nd_opts_last != NULL, ("%s: uninitialized ndopts",
397 __func__));
398 if (ndopts->nd_opts_search == NULL)
399 return NULL;
400 if (ndopts->nd_opts_done)
401 return NULL;
402
403 nd_opt = ndopts->nd_opts_search;
404
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));
408 return NULL;
409 }
410
411 olen = nd_opt->nd_opt_len << 3;
412 if (olen == 0) {
413 /*
414 * Message validation requires that all included
415 * options have a length that is greater than zero.
416 */
417 bzero(ndopts, sizeof(*ndopts));
418 return NULL;
419 }
420
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));
425 return NULL;
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;
430 }
431 return nd_opt;
432}
433
434/*
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.
438 */
439int
440nd6_options(union nd_opts *ndopts)
441{
442 struct nd_opt_hdr *nd_opt;
443 int i = 0;
444
445 KASSERT(ndopts != NULL, ("%s: ndopts == NULL", __func__));
446 KASSERT(ndopts->nd_opts_last != NULL, ("%s: uninitialized ndopts",
447 __func__));
448 if (ndopts->nd_opts_search == NULL)
449 return 0;
450
451 while (1) {
452 nd_opt = nd6_option(ndopts);
453 if (nd_opt == NULL && ndopts->nd_opts_last == NULL) {
454 /*
455 * Message validation requires that all included
456 * options have a length that is greater than zero.
457 */
458 ICMP6STAT_INC(icp6s_nd_badopt);
459 bzero(ndopts, sizeof(*ndopts));
460 return -1;
461 }
462
463 if (nd_opt == NULL)
464 goto skip1;
465
466 switch (nd_opt->nd_opt_type) {
467 case ND_OPT_SOURCE_LINKADDR:
468 case ND_OPT_TARGET_LINKADDR:
469 case ND_OPT_MTU:
470 case ND_OPT_REDIRECTED_HEADER:
471 case ND_OPT_NONCE:
472 if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) {
473 nd6log((LOG_INFO,
474 "duplicated ND6 option found (type=%d)\n",
475 nd_opt->nd_opt_type));
476 /* XXX bark? */
477 } else {
478 ndopts->nd_opt_array[nd_opt->nd_opt_type]
479 = nd_opt;
480 }
481 break;
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]
485 = nd_opt;
486 }
487 ndopts->nd_opts_pi_end =
488 (struct nd_opt_prefix_info *)nd_opt;
489 break;
490 /* What about ND_OPT_ROUTE_INFO? RFC 4191 */
491 case ND_OPT_RDNSS: /* RFC 6106 */
492 case ND_OPT_DNSSL: /* RFC 6106 */
493 /*
494 * Silently ignore options we know and do not care about
495 * in the kernel.
496 */
497 break;
498 default:
499 /*
500 * Unknown options must be silently ignored,
501 * to accommodate future extension to the protocol.
502 */
503 nd6log((LOG_DEBUG,
504 "nd6_options: unsupported option %d - "
505 "option ignored\n", nd_opt->nd_opt_type));
506 }
507
508skip1:
509 i++;
510 if (i > V_nd6_maxndopt) {
511 ICMP6STAT_INC(icp6s_nd_toomanyopt);
512 nd6log((LOG_INFO, "too many loop in nd opt\n"));
513 break;
514 }
515
516 if (ndopts->nd_opts_done)
517 break;
518 }
519
520 return 0;
521}
522
523/*
524 * ND6 timer routine to handle ND6 entries
525 */
526static void
527nd6_llinfo_settimer_locked(struct llentry *ln, long tick)
528{
529 int canceled;
530
531 LLE_WLOCK_ASSERT(ln);
532
533 /* Do not schedule timers for child LLEs. */
534 if (ln->la_flags & LLE_CHILD)
535 return;
536
537 if (tick < 0) {
538 ln->la_expire = 0;
539 ln->ln_ntick = 0;
540 canceled = callout_stop(&ln->lle_timer);
541 } else {
542 ln->la_expire = time_uptime + tick / hz;
543 LLE_ADDREF(ln);
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);
548 } else {
549 ln->ln_ntick = 0;
550 canceled = callout_reset(&ln->lle_timer, tick,
551 nd6_llinfo_timer, ln);
552 }
553 }
554 if (canceled > 0)
555 LLE_REMREF(ln);
556}
557
558/*
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.
562 *
563 * Set noinline to be dtrace-friendly
564 */
565static __noinline struct in6_addr *
566nd6_llinfo_get_holdsrc(struct llentry *ln, struct in6_addr *src)
567{
568 struct ip6_hdr hdr;
569 struct mbuf *m;
570
571 if (ln->la_hold == NULL)
572 return (NULL);
573
574 /*
575 * assume every packet in la_hold has the same IP header
576 */
577 m = ln->la_hold;
578 if (sizeof(hdr) > m->m_len)
579 return (NULL);
580
581 m_copydata(m, 0, sizeof(hdr), (caddr_t)&hdr);
582 *src = hdr.ip6_src;
583
584 return (src);
585}
586
587/*
588 * Checks if we need to switch from STALE state.
589 *
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
593 * not received).
594 *
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).
600 *
601 * Typically, V_nd6_gctimer is bigger than V_nd6_delay, so
602 * we perform the following upon entering STALE state:
603 *
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
607 * as user expects.
608 *
609 * 2) Reschedule timer until original V_nd6_gctimer expires keeping
610 * lle in STALE state (remaining timer value stored in lle_remtime).
611 *
612 * 3) Reschedule timer if packet was transmitted less that V_nd6_delay
613 * seconds ago.
614 *
615 * Returns non-zero value if the entry is still STALE (storing
616 * the next timer interval in @pdelay).
617 *
618 * Returns zero value if original timer expired or we need to switch to
619 * PROBE (store that in @do_switch variable).
620 */
621static int
622nd6_is_stale(struct llentry *lle, long *pdelay, int *do_switch)
623{
624 int nd_delay, nd_gctimer;
625 time_t lle_hittime;
626 long delay;
627
628 *do_switch = 0;
629 nd_gctimer = V_nd6_gctimer;
630 nd_delay = V_nd6_delay;
631
632 lle_hittime = llentry_get_hittime(lle);
633
634 if (lle_hittime == 0) {
635 /*
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.
639 */
640 delay = (long)(MIN(nd_gctimer, nd_delay));
641 delay *= hz;
642 if (lle->lle_remtime > delay)
643 lle->lle_remtime -= delay;
644 else {
645 delay = lle->lle_remtime;
646 lle->lle_remtime = 0;
647 }
648
649 if (delay == 0) {
650 /*
651 * The original ng6_gctime timeout ended,
652 * no more rescheduling.
653 */
654 return (0);
655 }
656
657 *pdelay = delay;
658 return (1);
659 }
660
661 /*
662 * Packet received. Verify timestamp
663 */
664 delay = (long)(time_uptime - lle_hittime);
665 if (delay < nd_delay) {
666 /*
667 * V_nd6_delay still not passed since the first
668 * hit in STALE state.
669 * Reschedule timer and return.
670 */
671 *pdelay = (long)(nd_delay - delay) * hz;
672 return (1);
673 }
674
675 /* Request switching to probe */
676 *do_switch = 1;
677 return (0);
678}
679
680/*
681 * Switch @lle state to new state optionally arming timers.
682 *
683 * Set noinline to be dtrace-friendly
684 */
685__noinline void
686nd6_llinfo_setstate(struct llentry *lle, int newstate)
687{
688 struct ifnet *ifp;
689 int nd_gctimer, nd_delay;
690 long delay, remtime;
691
692 delay = 0;
693 remtime = 0;
694
695 switch (newstate) {
696 case ND6_LLINFO_INCOMPLETE:
697 ifp = lle->lle_tbl->llt_ifp;
698 delay = (long)ND_IFINFO(ifp)->retrans * hz / 1000;
699 break;
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;
704 }
705 break;
706 case ND6_LLINFO_STALE:
707
708 llentry_request_feedback(lle);
709 nd_delay = V_nd6_delay;
710 nd_gctimer = V_nd6_gctimer;
711
712 delay = (long)(MIN(nd_gctimer, nd_delay)) * hz;
713 remtime = (long)nd_gctimer * hz - delay;
714 break;
715 case ND6_LLINFO_DELAY:
716 lle->la_asked = 0;
717 delay = (long)V_nd6_delay * hz;
718 break;
719 }
720
721 if (delay > 0)
722 nd6_llinfo_settimer_locked(lle, delay);
723
724 lle->lle_remtime = remtime;
725 lle->ln_state = newstate;
726}
727
728/*
729 * Timer-dependent part of nd state machine.
730 *
731 * Set noinline to be dtrace-friendly
732 */
733static __noinline void
734nd6_llinfo_timer(void *arg)
735{
736 struct epoch_tracker et;
737 struct llentry *ln;
738 struct in6_addr *dst, *pdst, *psrc, src;
739 struct ifnet *ifp;
740 struct nd_ifinfo *ndi;
741 int do_switch, send_ns;
742 long delay;
743
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);
748
749 ND6_RLOCK();
750 LLE_WLOCK(ln);
751 if (callout_pending(&ln->lle_timer)) {
752 /*
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
766 * would have been 1.
767 */
768 LLE_WUNLOCK(ln);
769 ND6_RUNLOCK();
770 CURVNET_RESTORE();
771 return;
772 }
773 NET_EPOCH_ENTER(et);
774 ndi = ND_IFINFO(ifp);
775 send_ns = 0;
776 dst = &ln->r_l3addr.addr6;
777 pdst = dst;
778
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);
783 } else {
784 ln->ln_ntick = 0;
785 nd6_llinfo_settimer_locked(ln, ln->ln_ntick);
786 }
787 goto done;
788 }
789
790 if (ln->la_flags & LLE_STATIC) {
791 goto done;
792 }
793
794 if (ln->la_flags & LLE_DELETED) {
795 nd6_free(&ln, 0);
796 goto done;
797 }
798
799 switch (ln->ln_state) {
800 case ND6_LLINFO_INCOMPLETE:
801 if (ln->la_asked < V_nd6_mmaxtries) {
802 ln->la_asked++;
803 send_ns = 1;
804 /* Send NS to multicast address */
805 pdst = NULL;
806 } else {
807 struct mbuf *m = ln->la_hold;
808 if (m) {
809 struct mbuf *m0;
810
811 /*
812 * assuming every packet in la_hold has the
813 * same IP header. Send error after unlock.
814 */
815 m0 = m->m_nextpkt;
816 m->m_nextpkt = NULL;
817 ln->la_hold = m0;
818 clear_llinfo_pqueue(ln);
819 }
820 nd6_free(&ln, 0);
821 if (m != NULL) {
822 struct mbuf *n = m;
823
824 /*
825 * if there are any ummapped mbufs, we
826 * must free them, rather than using
827 * them for an ICMP, as they cannot be
828 * checksummed.
829 */
830 while ((n = n->m_next) != NULL) {
831 if (n->m_flags & M_EXTPG)
832 break;
833 }
834 if (n != NULL) {
835 m_freem(m);
836 m = NULL;
837 } else {
838 icmp6_error2(m, ICMP6_DST_UNREACH,
839 ICMP6_DST_UNREACH_ADDR, 0, ifp);
840 }
841 }
842 }
843 break;
844 case ND6_LLINFO_REACHABLE:
845 if (!ND6_LLINFO_PERMANENT(ln))
846 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE);
847 break;
848
849 case ND6_LLINFO_STALE:
850 if (nd6_is_stale(ln, &delay, &do_switch) != 0) {
851 /*
852 * No packet has used this entry and GC timeout
853 * has not been passed. Reschedule timer and
854 * return.
855 */
856 nd6_llinfo_settimer_locked(ln, delay);
857 break;
858 }
859
860 if (do_switch == 0) {
861 /*
862 * GC timer has ended and entry hasn't been used.
863 * Run Garbage collector (RFC 4861, 5.3)
864 */
865 if (!ND6_LLINFO_PERMANENT(ln))
866 nd6_free(&ln, 1);
867 break;
868 }
869
870 /* Entry has been used AND delay timer has ended. */
871
872 /* FALLTHROUGH */
873
874 case ND6_LLINFO_DELAY:
875 if (ndi && (ndi->flags & ND6_IFF_PERFORMNUD) != 0) {
876 /* We need NUD */
877 ln->la_asked = 1;
878 nd6_llinfo_setstate(ln, ND6_LLINFO_PROBE);
879 send_ns = 1;
880 } else
881 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE); /* XXX */
882 break;
883 case ND6_LLINFO_PROBE:
884 if (ln->la_asked < V_nd6_umaxtries) {
885 ln->la_asked++;
886 send_ns = 1;
887 } else {
888 nd6_free(&ln, 0);
889 }
890 break;
891 default:
892 panic("%s: paths in a dark night can be confusing: %d",
893 __func__, ln->ln_state);
894 }
895done:
896 if (ln != NULL)
897 ND6_RUNLOCK();
898 if (send_ns != 0) {
899 nd6_llinfo_settimer_locked(ln, (long)ndi->retrans * hz / 1000);
900 psrc = nd6_llinfo_get_holdsrc(ln, &src);
901 LLE_FREE_LOCKED(ln);
902 ln = NULL;
903 nd6_ns_output(ifp, psrc, pdst, dst, NULL);
904 }
905
906 if (ln != NULL)
907 LLE_FREE_LOCKED(ln);
908 NET_EPOCH_EXIT(et);
909 CURVNET_RESTORE();
910}
911
912/*
913 * ND6 timer routine to expire default route list and prefix list
914 */
915void
916nd6_timer(void *arg)
917{
918 CURVNET_SET((struct vnet *) arg);
919 struct epoch_tracker et;
920 struct nd_prhead prl;
921 struct nd_prefix *pr, *npr;
922 struct ifnet *ifp;
923 struct in6_ifaddr *ia6, *nia6;
924 uint64_t genid;
925
926 LIST_INIT(&prl);
927
928 NET_EPOCH_ENTER(et);
929 nd6_defrouter_timer();
930
931 /*
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.
936 *
937 * XXXRW: in6_ifaddrhead locking.
938 */
939 addrloop:
940 CK_STAILQ_FOREACH_SAFE(ia6, &V_in6_ifaddrhead, ia_link, nia6) {
941 /* check address lifetime */
942 if (IFA6_IS_INVALID(ia6)) {
943 int regen = 0;
944
945 /*
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
953 * regeneration.
954 */
955 if (V_ip6_use_tempaddr &&
956 (ia6->ia6_flags & IN6_IFF_TEMPORARY) != 0) {
957 if (regen_tmpaddr(ia6) == 0)
958 regen = 1;
959 }
960
961 in6_purgeaddr(&ia6->ia_ifa);
962
963 if (regen)
964 goto addrloop; /* XXX: see below */
965 } else if (IFA6_IS_DEPRECATED(ia6)) {
966 int oldflags = ia6->ia6_flags;
967
968 ia6->ia6_flags |= IN6_IFF_DEPRECATED;
969
970 /*
971 * If a temporary address has just become deprecated,
972 * regenerate a new one if possible.
973 */
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) {
978 /*
979 * A new temporary address is
980 * generated.
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??
989 */
990 goto addrloop;
991 }
992 }
993 } else if ((ia6->ia6_flags & IN6_IFF_TENTATIVE) != 0) {
994 /*
995 * Schedule DAD for a tentative address. This happens
996 * if the interface was down or not running
997 * when the address was configured.
998 */
999 int delay;
1000
1001 delay = arc4random() %
1002 (MAX_RTR_SOLICITATION_DELAY * hz);
1003 nd6_dad_start((struct ifaddr *)ia6, delay);
1004 } else {
1005 /*
1006 * Check status of the interface. If it is down,
1007 * mark the address as tentative for future DAD.
1008 */
1009 ifp = ia6->ia_ifp;
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;
1016 }
1017
1018 /*
1019 * A new RA might have made a deprecated address
1020 * preferred.
1021 */
1022 ia6->ia6_flags &= ~IN6_IFF_DEPRECATED;
1023 }
1024 }
1025 NET_EPOCH_EXIT(et);
1026
1027 ND6_WLOCK();
1028restart:
1029 LIST_FOREACH_SAFE(pr, &V_nd_prefix, ndpr_entry, npr) {
1030 /*
1031 * Expire prefixes. Since the pltime is only used for
1032 * autoconfigured addresses, pltime processing for prefixes is
1033 * not necessary.
1034 *
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.
1040 */
1041 if (pr->ndpr_vltime == ND6_INFINITE_LIFETIME ||
1042 time_uptime - pr->ndpr_lastupdate <= pr->ndpr_vltime)
1043 continue;
1044
1045 if (pr->ndpr_addrcnt == 0) {
1046 nd6_prefix_unlink(pr, &prl);
1047 continue;
1048 }
1049 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0) {
1050 genid = V_nd6_list_genid;
1051 nd6_prefix_ref(pr);
1052 ND6_WUNLOCK();
1053 ND6_ONLINK_LOCK();
1054 (void)nd6_prefix_offlink(pr);
1055 ND6_ONLINK_UNLOCK();
1056 ND6_WLOCK();
1057 nd6_prefix_rele(pr);
1058 if (genid != V_nd6_list_genid)
1059 goto restart;
1060 }
1061 }
1062 ND6_WUNLOCK();
1063
1064 while ((pr = LIST_FIRST(&prl)) != NULL) {
1065 LIST_REMOVE(pr, ndpr_entry);
1066 nd6_prefix_del(pr);
1067 }
1068
1069 callout_reset(&V_nd6_timer_ch, V_nd6_prune * hz,
1070 nd6_timer, curvnet);
1071
1072 CURVNET_RESTORE();
1073}
1074
1075/*
1076 * ia6 - deprecated/invalidated temporary address
1077 */
1078static int
1079regen_tmpaddr(struct in6_ifaddr *ia6)
1080{
1081 struct ifaddr *ifa;
1082 struct ifnet *ifp;
1083 struct in6_ifaddr *public_ifa6 = NULL;
1084
1085 NET_EPOCH_ASSERT();
1086
1087 ifp = ia6->ia_ifa.ifa_ifp;
1088 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1089 struct in6_ifaddr *it6;
1090
1091 if (ifa->ifa_addr->sa_family != AF_INET6)
1092 continue;
1093
1094 it6 = (struct in6_ifaddr *)ifa;
1095
1096 /* ignore no autoconf addresses. */
1097 if ((it6->ia6_flags & IN6_IFF_AUTOCONF) == 0)
1098 continue;
1099
1100 /* ignore autoconf addresses with different prefixes. */
1101 if (it6->ia6_ndpr == NULL || it6->ia6_ndpr != ia6->ia6_ndpr)
1102 continue;
1103
1104 /*
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
1109 * a long period.
1110 */
1111 if ((it6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
1112 !IFA6_IS_DEPRECATED(it6)) {
1113 public_ifa6 = NULL;
1114 break;
1115 }
1116
1117 /*
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.
1122 */
1123 if (!IFA6_IS_DEPRECATED(it6))
1124 public_ifa6 = it6;
1125 }
1126 if (public_ifa6 != NULL)
1127 ifa_ref(&public_ifa6->ia_ifa);
1128
1129 if (public_ifa6 != NULL) {
1130 int e;
1131
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);
1136 return (-1);
1137 }
1138 ifa_free(&public_ifa6->ia_ifa);
1139 return (0);
1140 }
1141
1142 return (-1);
1143}
1144
1145/*
1146 * Remove prefix and default router list entries corresponding to ifp. Neighbor
1147 * cache entries are freed in in6_domifdetach().
1148 */
1149void
1150nd6_purge(struct ifnet *ifp)
1151{
1152 struct nd_prhead prl;
1153 struct nd_prefix *pr, *npr;
1154
1155 LIST_INIT(&prl);
1156
1157 /* Purge default router list entries toward ifp. */
1158 nd6_defrouter_purge(ifp);
1159
1160 ND6_WLOCK();
1161 /*
1162 * Remove prefixes on ifp. We should have already removed addresses on
1163 * this interface, so no addresses should be referencing these prefixes.
1164 */
1165 LIST_FOREACH_SAFE(pr, &V_nd_prefix, ndpr_entry, npr) {
1166 if (pr->ndpr_ifp == ifp)
1167 nd6_prefix_unlink(pr, &prl);
1168 }
1169 ND6_WUNLOCK();
1170
1171 /* Delete the unlinked prefix objects. */
1172 while ((pr = LIST_FIRST(&prl)) != NULL) {
1173 LIST_REMOVE(pr, ndpr_entry);
1174 nd6_prefix_del(pr);
1175 }
1176
1177 /* cancel default outgoing interface setting */
1178 if (V_nd6_defifindex == ifp->if_index)
1179 nd6_setdefaultiface(0);
1180
1181 if (ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV) {
1182 /* Refresh default router list. */
1183 defrouter_select_fib(ifp->if_fib);
1184 }
1185}
1186
1187/*
1188 * the caller acquires and releases the lock on the lltbls
1189 * Returns the llentry locked
1190 */
1191struct llentry *
1192nd6_lookup(const struct in6_addr *addr6, int flags, struct ifnet *ifp)
1193{
1194 struct sockaddr_in6 sin6;
1195 struct llentry *ln;
1196
1197 bzero(&sin6, sizeof(sin6));
1198 sin6.sin6_len = sizeof(struct sockaddr_in6);
1199 sin6.sin6_family = AF_INET6;
1200 sin6.sin6_addr = *addr6;
1201
1202 IF_AFDATA_LOCK_ASSERT(ifp);
1203
1204 ln = lla_lookup(LLTABLE6(ifp), flags, (struct sockaddr *)&sin6);
1205
1206 return (ln);
1207}
1208
1209static struct llentry *
1210nd6_alloc(const struct in6_addr *addr6, int flags, struct ifnet *ifp)
1211{
1212 struct sockaddr_in6 sin6;
1213 struct llentry *ln;
1214
1215 bzero(&sin6, sizeof(sin6));
1216 sin6.sin6_len = sizeof(struct sockaddr_in6);
1217 sin6.sin6_family = AF_INET6;
1218 sin6.sin6_addr = *addr6;
1219
1220 ln = lltable_alloc_entry(LLTABLE6(ifp), 0, (struct sockaddr *)&sin6);
1221 if (ln != NULL)
1222 ln->ln_state = ND6_LLINFO_NOSTATE;
1223
1224 return (ln);
1225}
1226
1227/*
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.
1231 */
1232static int
1233nd6_is_new_addr_neighbor(const struct sockaddr_in6 *addr, struct ifnet *ifp)
1234{
1235 struct nd_prefix *pr;
1236 struct ifaddr *ifa;
1237 struct rt_addrinfo info;
1238 struct sockaddr_in6 rt_key;
1239 const struct sockaddr *dst6;
1240 uint64_t genid;
1241 int error, fibnum;
1242
1243 /*
1244 * A link-local address is always a neighbor.
1245 * XXX: a link does not necessarily specify a single interface.
1246 */
1247 if (IN6_IS_ADDR_LINKLOCAL(&addr->sin6_addr)) {
1248 struct sockaddr_in6 sin6_copy;
1249 u_int32_t zone;
1250
1251 /*
1252 * We need sin6_copy since sa6_recoverscope() may modify the
1253 * content (XXX).
1254 */
1255 sin6_copy = *addr;
1256 if (sa6_recoverscope(&sin6_copy))
1257 return (0); /* XXX: should be impossible */
1258 if (in6_setscope(&sin6_copy.sin6_addr, ifp, &zone))
1259 return (0);
1260 if (sin6_copy.sin6_scope_id == zone)
1261 return (1);
1262 else
1263 return (0);
1264 }
1265
1266 bzero(&rt_key, sizeof(rt_key));
1267 bzero(&info, sizeof(info));
1268 info.rti_info[RTAX_DST] = (struct sockaddr *)&rt_key;
1269
1270 /*
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
1274 * neighbor.
1275 */
1276 ND6_RLOCK();
1277restart:
1278 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) {
1279 if (pr->ndpr_ifp != ifp)
1280 continue;
1281
1282 if ((pr->ndpr_stateflags & NDPRF_ONLINK) == 0) {
1283 dst6 = (const struct sockaddr *)&pr->ndpr_prefix;
1284
1285 /*
1286 * We only need to check all FIBs if add_addr_allfibs
1287 * is unset. If set, checking any FIB will suffice.
1288 */
1289 fibnum = V_rt_add_addr_allfibs ? rt_numfibs - 1 : 0;
1290 for (; fibnum < rt_numfibs; fibnum++) {
1291 genid = V_nd6_list_genid;
1292 ND6_RUNLOCK();
1293
1294 /*
1295 * Restore length field before
1296 * retrying lookup
1297 */
1298 rt_key.sin6_len = sizeof(rt_key);
1299 error = rib_lookup_info(fibnum, dst6, 0, 0,
1300 &info);
1301
1302 ND6_RLOCK();
1303 if (genid != V_nd6_list_genid)
1304 goto restart;
1305 if (error == 0)
1306 break;
1307 }
1308 if (error != 0)
1309 continue;
1310
1311 /*
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.
1316 */
1317 if (!IN6_ARE_ADDR_EQUAL(&pr->ndpr_prefix.sin6_addr,
1318 &rt_key.sin6_addr))
1319 continue;
1320 }
1321
1322 if (IN6_ARE_MASKED_ADDR_EQUAL(&pr->ndpr_prefix.sin6_addr,
1323 &addr->sin6_addr, &pr->ndpr_mask)) {
1324 ND6_RUNLOCK();
1325 return (1);
1326 }
1327 }
1328 ND6_RUNLOCK();
1329
1330 /*
1331 * If the address is assigned on the node of the other side of
1332 * a p2p interface, the address should be a neighbor.
1333 */
1334 if (ifp->if_flags & IFF_POINTOPOINT) {
1335 struct epoch_tracker et;
1336
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)
1340 continue;
1341 if (ifa->ifa_dstaddr != NULL &&
1342 sa_equal(addr, ifa->ifa_dstaddr)) {
1343 NET_EPOCH_EXIT(et);
1344 return 1;
1345 }
1346 }
1347 NET_EPOCH_EXIT(et);
1348 }
1349
1350 /*
1351 * If the default router list is empty, all addresses are regarded
1352 * as on-link, and thus, as a neighbor.
1353 */
1354 if (ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV &&
1355 nd6_defrouter_list_empty() &&
1356 V_nd6_defifindex == ifp->if_index) {
1357 return (1);
1358 }
1359
1360 return (0);
1361}
1362
1363/*
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?
1366 */
1367int
1368nd6_is_addr_neighbor(const struct sockaddr_in6 *addr, struct ifnet *ifp)
1369{
1370 struct llentry *lle;
1371 int rc = 0;
1372
1373 NET_EPOCH_ASSERT();
1374 IF_AFDATA_UNLOCK_ASSERT(ifp);
1375 if (nd6_is_new_addr_neighbor(addr, ifp))
1376 return (1);
1377
1378 /*
1379 * Even if the address matches none of our addresses, it might be
1380 * in the neighbor cache.
1381 */
1382 if ((lle = nd6_lookup(&addr->sin6_addr, LLE_SF(AF_INET6, 0), ifp)) != NULL) {
1383 LLE_RUNLOCK(lle);
1384 rc = 1;
1385 }
1386 return (rc);
1387}
1388
1389static __noinline void
1390nd6_free_children(struct llentry *lle)
1391{
1392 struct llentry *child_lle;
1393
1394 NET_EPOCH_ASSERT();
1395 LLE_WLOCK_ASSERT(lle);
1396
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);
1401 }
1402}
1403
1404/*
1405 * Tries to update @lle address/prepend data with new @lladdr.
1406 *
1407 * Returns true on success.
1408 * In any case, @lle is returned wlocked.
1409 */
1410static __noinline bool
1411nd6_try_set_entry_addr_locked(struct ifnet *ifp, struct llentry *lle, char *lladdr)
1412{
1413 u_char buf[LLE_MAX_LINKHDR];
1414 int fam, off;
1415 size_t sz;
1416
1417 sz = sizeof(buf);
1418 if (lltable_calc_llheader(ifp, AF_INET6, lladdr, buf, &sz, &off) != 0)
1419 return (false);
1420
1421 /* Update data */
1422 lltable_set_entry_addr(ifp, lle, buf, sz, off);
1423
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;
1428 sz = sizeof(buf);
1429 if (lltable_calc_llheader(ifp, fam, lladdr, buf, &sz, &off) == 0) {
1430 /* success */
1431 lltable_set_entry_addr(ifp, child_lle, buf, sz, off);
1432 child_lle->ln_state = ND6_LLINFO_REACHABLE;
1433 }
1434 LLE_WUNLOCK(child_lle);
1435 }
1436
1437 return (true);
1438}
1439
1440bool
1441nd6_try_set_entry_addr(struct ifnet *ifp, struct llentry *lle, char *lladdr)
1442{
1443 NET_EPOCH_ASSERT();
1444 LLE_WLOCK_ASSERT(lle);
1445
1446 if (!lltable_acquire_wlock(ifp, lle))
1447 return (false);
1448 bool ret = nd6_try_set_entry_addr_locked(ifp, lle, lladdr);
1449 IF_AFDATA_WUNLOCK(ifp);
1450
1451 return (ret);
1452}
1453
1454/*
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.
1459 *
1460 * Set noinline to be dtrace-friendly
1461 */
1462static __noinline void
1463nd6_free(struct llentry **lnp, int gc)
1464{
1465 struct ifnet *ifp;
1466 struct llentry *ln;
1467 struct nd_defrouter *dr;
1468
1469 ln = *lnp;
1470 *lnp = NULL;
1471
1472 LLE_WLOCK_ASSERT(ln);
1473 ND6_RLOCK_ASSERT();
1474
1475 KASSERT((ln->la_flags & LLE_CHILD) == 0, ("child lle"));
1476
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);
1480 else
1481 dr = NULL;
1482 ND6_RUNLOCK();
1483
1484 if ((ln->la_flags & LLE_DELETED) == 0)
1485 EVENTHANDLER_INVOKE(lle_event, ln, LLENTRY_EXPIRED);
1486
1487 /*
1488 * we used to have pfctlinput(PRC_HOSTDEAD) here.
1489 * even though it is not harmful, it was not really necessary.
1490 */
1491
1492 /* cancel timer */
1493 nd6_llinfo_settimer_locked(ln, -1);
1494
1495 if (ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV) {
1496 if (dr != NULL && dr->expire &&
1497 ln->ln_state == ND6_LLINFO_STALE && gc) {
1498 /*
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
1506 * values.
1507 * XXX: the check for ln_state would be redundant,
1508 * but we intentionally keep it just in case.
1509 */
1510 if (dr->expire > time_uptime)
1511 nd6_llinfo_settimer_locked(ln,
1512 (dr->expire - time_uptime) * hz);
1513 else
1514 nd6_llinfo_settimer_locked(ln,
1515 (long)V_nd6_gctimer * hz);
1516
1517 LLE_REMREF(ln);
1518 LLE_WUNLOCK(ln);
1519 defrouter_rele(dr);
1520 return;
1521 }
1522
1523 if (dr) {
1524 /*
1525 * Unreachablity of a router might affect the default
1526 * router selection and on-link detection of advertised
1527 * prefixes.
1528 */
1529
1530 /*
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.
1536 */
1537 ln->ln_state = ND6_LLINFO_INCOMPLETE;
1538 }
1539
1540 if (ln->ln_router || dr) {
1541 /*
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.
1546 */
1547 LLE_WUNLOCK(ln);
1548
1549 /*
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().
1553 */
1554 rt6_flush(&ln->r_l3addr.addr6, ifp);
1555 }
1556
1557 if (dr) {
1558 /*
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
1562 * the check now.
1563 */
1564 pfxlist_onlink_check();
1565
1566 /*
1567 * Refresh default router list.
1568 */
1569 defrouter_select_fib(dr->ifp->if_fib);
1570 }
1571
1572 /*
1573 * If this entry was added by an on-link redirect, remove the
1574 * corresponding host route.
1575 */
1576 if (ln->la_flags & LLE_REDIRECT)
1577 nd6_free_redirect(ln);
1578
1579 if (ln->ln_router || dr)
1580 LLE_WLOCK(ln);
1581 }
1582
1583 /*
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.
1586 */
1587 LLE_WUNLOCK(ln);
1588 IF_AFDATA_LOCK(ifp);
1589 LLE_WLOCK(ln);
1590 /* Guard against race with other llentry_free(). */
1591 if (ln->la_flags & LLE_LINKED) {
1592 /* Remove callout reference */
1593 LLE_REMREF(ln);
1594 lltable_unlink_entry(ln->lle_tbl, ln);
1595 }
1596 IF_AFDATA_UNLOCK(ifp);
1597
1598 nd6_free_children(ln);
1599
1600 llentry_free(ln);
1601 if (dr != NULL)
1602 defrouter_rele(dr);
1603}
1604
1605static int
1606nd6_isdynrte(const struct rtentry *rt, const struct nhop_object *nh, void *xap)
1607{
1608
1609 if (nh->nh_flags & NHF_REDIRECT)
1610 return (1);
1611
1612 return (0);
1613}
1614
1615/*
1616 * Remove the rtentry for the given llentry,
1617 * both of which were installed by a redirect.
1618 */
1619static void
1620nd6_free_redirect(const struct llentry *ln)
1621{
1622 int fibnum;
1623 struct sockaddr_in6 sin6;
1624 struct rt_addrinfo info;
1625 struct rib_cmd_info rc;
1626 struct epoch_tracker et;
1627
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;
1632
1633 NET_EPOCH_ENTER(et);
1634 for (fibnum = 0; fibnum < rt_numfibs; fibnum++)
1635 rib_action(fibnum, RTM_DELETE, &info, &rc);
1636 NET_EPOCH_EXIT(et);
1637}
1638
1639/*
1640 * Updates status of the default router route.
1641 */
1642static void
1643check_release_defrouter(struct rib_cmd_info *rc, void *_cbdata)
1644{
1645 struct nd_defrouter *dr;
1646 struct nhop_object *nh;
1647
1648 nh = rc->rc_nh_old;
1649
1650 if ((nh != NULL) && (nh->nh_flags & NHF_DEFAULT)) {
1651 dr = defrouter_lookup(&nh->gw6_sa.sin6_addr, nh->nh_ifp);
1652 if (dr != NULL) {
1653 dr->installed = 0;
1654 defrouter_rele(dr);
1655 }
1656 }
1657}
1658
1659void
1660nd6_subscription_cb(struct rib_head *rnh, struct rib_cmd_info *rc, void *arg)
1661{
1662
1663#ifdef ROUTE_MPATH
1664 rib_decompose_notification(rc, check_release_defrouter, NULL);
1665#else
1666 check_release_defrouter(rc, NULL);
1667#endif
1668}
1669
1670int
1671nd6_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp)
1672{
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;
1677 int error = 0;
1678
1679 if (ifp->if_afdata[AF_INET6] == NULL)
1680 return (EPFNOSUPPORT);
1681 switch (cmd) {
1682 case OSIOCGIFINFO_IN6:
1683#define ND ndi->ndi
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;
1694 break;
1695 case SIOCGIFINFO_IN6:
1696 ND = *ND_IFINFO(ifp);
1697 break;
1698 case SIOCSIFINFO_IN6:
1699 /*
1700 * used to change host variables from userland.
1701 * intended for a use on router to reflect RA configurations.
1702 */
1703 /* 0 means 'unspecified' */
1704 if (ND.linkmtu != 0) {
1705 if (ND.linkmtu < IPV6_MMTU ||
1706 ND.linkmtu > IN6_LINKMTU(ifp)) {
1707 error = EINVAL;
1708 break;
1709 }
1710 ND_IFINFO(ifp)->linkmtu = ND.linkmtu;
1711 }
1712
1713 if (ND.basereachable != 0) {
1714 int obasereachable = ND_IFINFO(ifp)->basereachable;
1715
1716 ND_IFINFO(ifp)->basereachable = ND.basereachable;
1717 if (ND.basereachable != obasereachable)
1718 ND_IFINFO(ifp)->reachable =
1719 ND_COMPUTE_RTIME(ND.basereachable);
1720 }
1721 if (ND.retrans != 0)
1722 ND_IFINFO(ifp)->retrans = ND.retrans;
1723 if (ND.chlim != 0)
1724 ND_IFINFO(ifp)->chlim = ND.chlim;
1725 /* FALLTHROUGH */
1726 case SIOCSIFINFO_FLAGS:
1727 {
1728 struct ifaddr *ifa;
1729 struct in6_ifaddr *ia;
1730
1731 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) &&
1732 !(ND.flags & ND6_IFF_IFDISABLED)) {
1733 /* ifdisabled 1->0 transision */
1734
1735 /*
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.
1740 */
1741 NET_EPOCH_ENTER(et);
1742 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1743 if (ifa->ifa_addr->sa_family != AF_INET6)
1744 continue;
1745 ia = (struct in6_ifaddr *)ifa;
1746 if ((ia->ia6_flags & IN6_IFF_DUPLICATED) &&
1747 IN6_IS_ADDR_LINKLOCAL(IA6_IN6(ia)))
1748 break;
1749 }
1750 NET_EPOCH_EXIT(et);
1751
1752 if (ifa != NULL) {
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"
1757 " duplicate.\n");
1758 } else {
1759 ND_IFINFO(ifp)->flags &= ~ND6_IFF_IFDISABLED;
1760 if (ifp->if_flags & IFF_UP)
1761 in6_if_up(ifp);
1762 }
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. */
1767
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,
1773 ifa_link) {
1774 if (ifa->ifa_addr->sa_family !=
1775 AF_INET6)
1776 continue;
1777 ia = (struct in6_ifaddr *)ifa;
1778 ia->ia6_flags |= IN6_IFF_TENTATIVE;
1779 }
1780 NET_EPOCH_EXIT(et);
1781 }
1782 }
1783
1784 if (ND.flags & ND6_IFF_AUTO_LINKLOCAL) {
1785 if (!(ND_IFINFO(ifp)->flags & ND6_IFF_AUTO_LINKLOCAL)) {
1786 /* auto_linklocal 0->1 transision */
1787
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) {
1793 /*
1794 * When the IF already has
1795 * ND6_IFF_AUTO_LINKLOCAL, no link-local
1796 * address is assigned, and IFF_UP, try to
1797 * assign one.
1798 */
1799 NET_EPOCH_ENTER(et);
1800 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead,
1801 ifa_link) {
1802 if (ifa->ifa_addr->sa_family !=
1803 AF_INET6)
1804 continue;
1805 ia = (struct in6_ifaddr *)ifa;
1806 if (IN6_IS_ADDR_LINKLOCAL(IA6_IN6(ia)))
1807 break;
1808 }
1809 NET_EPOCH_EXIT(et);
1810 if (ifa != NULL)
1811 /* No LLA is configured. */
1812 in6_ifattach(ifp, NULL);
1813 }
1814 }
1815 ND_IFINFO(ifp)->flags = ND.flags;
1816 break;
1817 }
1818#undef ND
1819 case SIOCSNDFLUSH_IN6: /* XXX: the ioctl name is confusing... */
1820 /* sync kernel routing table with the default router list */
1821 defrouter_reset();
1822 defrouter_select_fib(RT_ALL_FIBS);
1823 break;
1824 case SIOCSPFXFLUSH_IN6:
1825 {
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;
1830
1831 LIST_INIT(&prl);
1832
1833 ND6_WLOCK();
1834 LIST_FOREACH_SAFE(pr, &V_nd_prefix, ndpr_entry, next) {
1835 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr))
1836 continue; /* XXX */
1837 nd6_prefix_unlink(pr, &prl);
1838 }
1839 ND6_WUNLOCK();
1840
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,
1845 ia_next) {
1846 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) == 0)
1847 continue;
1848
1849 if (ia->ia6_ndpr == pr)
1850 in6_purgeaddr(&ia->ia_ifa);
1851 }
1852 nd6_prefix_del(pr);
1853 }
1854 break;
1855 }
1856 case SIOCSRTRFLUSH_IN6:
1857 {
1858 /* flush all the default routers */
1859
1860 defrouter_reset();
1861 nd6_defrouter_flush_all();
1862 defrouter_select_fib(RT_ALL_FIBS);
1863 break;
1864 }
1865 case SIOCGNBRINFO_IN6:
1866 {
1867 struct llentry *ln;
1868 struct in6_addr nb_addr = nbi->addr; /* make local for safety */
1869
1870 if ((error = in6_setscope(&nb_addr, ifp, NULL)) != 0)
1871 return (error);
1872
1873 NET_EPOCH_ENTER(et);
1874 ln = nd6_lookup(&nb_addr, LLE_SF(AF_INET6, 0), ifp);
1875 NET_EPOCH_EXIT(et);
1876
1877 if (ln == NULL) {
1878 error = EINVAL;
1879 break;
1880 }
1881 nbi->state = ln->ln_state;
1882 nbi->asked = ln->la_asked;
1883 nbi->isrouter = ln->ln_router;
1884 if (ln->la_expire == 0)
1885 nbi->expire = 0;
1886 else
1887 nbi->expire = ln->la_expire + ln->lle_remtime / hz +
1888 (time_second - time_uptime);
1889 LLE_RUNLOCK(ln);
1890 break;
1891 }
1892 case SIOCGDEFIFACE_IN6: /* XXX: should be implemented as a sysctl? */
1893 ndif->ifindex = V_nd6_defifindex;
1894 break;
1895 case SIOCSDEFIFACE_IN6: /* XXX: should be implemented as a sysctl? */
1896 return (nd6_setdefaultiface(ndif->ifindex));
1897 }
1898 return (error);
1899}
1900
1901/*
1902 * Calculates new isRouter value based on provided parameters and
1903 * returns it.
1904 */
1905static int
1906nd6_is_router(int type, int code, int is_new, int old_addr, int new_addr,
1907 int ln_router)
1908{
1909
1910 /*
1911 * ICMP6 type dependent behavior.
1912 *
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
1917 *
1918 * RA case, (1):
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.
1926 *
1927 * is_new old_addr new_addr NS RS RA redir
1928 * D R
1929 * 0 n n (1) c ? s
1930 * 0 y n (2) c s s
1931 * 0 n y (3) c s s
1932 * 0 y y (4) c s s
1933 * 0 y y (5) c s s
1934 * 1 -- n (6) c c c s
1935 * 1 -- y (7) c c s c s
1936 *
1937 * (c=clear s=set)
1938 */
1939 switch (type & 0xff) {
1940 case ND_NEIGHBOR_SOLICIT:
1941 /*
1942 * New entry must have is_router flag cleared.
1943 */
1944 if (is_new) /* (6-7) */
1945 ln_router = 0;
1946 break;
1947 case ND_REDIRECT:
1948 /*
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]
1952 */
1953 if (code == ND_REDIRECT_ROUTER)
1954 ln_router = 1;
1955 else {
1956 if (is_new) /* (6-7) */
1957 ln_router = 0;
1958 }
1959 break;
1960 case ND_ROUTER_SOLICIT:
1961 /*
1962 * is_router flag must always be cleared.
1963 */
1964 ln_router = 0;
1965 break;
1966 case ND_ROUTER_ADVERT:
1967 /*
1968 * Mark an entry with lladdr as a router.
1969 */
1970 if ((!is_new && (old_addr || new_addr)) || /* (2-5) */
1971 (is_new && new_addr)) { /* (7) */
1972 ln_router = 1;
1973 }
1974 break;
1975 }
1976
1977 return (ln_router);
1978}
1979
1980/*
1981 * Create neighbor cache entry and cache link-layer address,
1982 * on reception of inbound ND6 packets. (RS/RA/NS/redirect)
1983 *
1984 * type - ICMP6 type
1985 * code - type dependent information
1986 *
1987 */
1988void
1989nd6_cache_lladdr(struct ifnet *ifp, struct in6_addr *from, char *lladdr,
1990 int lladdrlen, int type, int code)
1991{
1992 struct llentry *ln = NULL, *ln_tmp;
1993 int is_newentry;
1994 int do_update;
1995 int olladdr;
1996 int llchange;
1997 int flags;
1998 uint16_t router = 0;
1999 struct mbuf *chain = NULL;
2000 u_char linkhdr[LLE_MAX_LINKHDR];
2001 size_t linkhdrsize;
2002 int lladdr_off;
2003
2004 NET_EPOCH_ASSERT();
2005 IF_AFDATA_UNLOCK_ASSERT(ifp);
2006
2007 KASSERT(ifp != NULL, ("%s: ifp == NULL", __func__));
2008 KASSERT(from != NULL, ("%s: from == NULL", __func__));
2009
2010 /* nothing must be updated for unspecified address */
2011 if (IN6_IS_ADDR_UNSPECIFIED(from))
2012 return;
2013
2014 /*
2015 * Validation about ifp->if_addrlen and lladdrlen must be done in
2016 * the caller.
2017 *
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).
2022 */
2023 flags = lladdr ? LLE_EXCLUSIVE : 0;
2024 ln = nd6_lookup(from, LLE_SF(AF_INET6, flags), ifp);
2025 is_newentry = 0;
2026 if (ln == NULL) {
2027 flags |= LLE_EXCLUSIVE;
2028 ln = nd6_alloc(from, 0, ifp);
2029 if (ln == NULL)
2030 return;
2031
2032 /*
2033 * Since we already know all the data for the new entry,
2034 * fill it before insertion.
2035 */
2036 if (lladdr != NULL) {
2037 linkhdrsize = sizeof(linkhdr);
2038 if (lltable_calc_llheader(ifp, AF_INET6, lladdr,
2039 linkhdr, &linkhdrsize, &lladdr_off) != 0)
2040 return;
2041 lltable_set_entry_addr(ifp, ln, linkhdr, linkhdrsize,
2042 lladdr_off);
2043 }
2044
2045 IF_AFDATA_WLOCK(ifp);
2046 LLE_WLOCK(ln);
2047 /* Prefer any existing lle over newly-created one */
2048 ln_tmp = nd6_lookup(from, LLE_SF(AF_INET6, LLE_EXCLUSIVE), ifp);
2049 if (ln_tmp == NULL)
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) */
2054 is_newentry = 1;
2055 if (lladdr != NULL) { /* (7) */
2056 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE);
2057 EVENTHANDLER_INVOKE(lle_event, ln,
2058 LLENTRY_RESOLVED);
2059 }
2060 } else {
2061 lltable_free_entry(LLTABLE6(ifp), ln);
2062 ln = ln_tmp;
2063 ln_tmp = NULL;
2064 }
2065 }
2066 /* do nothing if static ndp is set */
2067 if ((ln->la_flags & LLE_STATIC)) {
2068 if (flags & LLE_EXCLUSIVE)
2069 LLE_WUNLOCK(ln);
2070 else
2071 LLE_RUNLOCK(ln);
2072 return;
2073 }
2074
2075 olladdr = (ln->la_flags & LLE_VALID) ? 1 : 0;
2076 if (olladdr && lladdr) {
2077 llchange = bcmp(lladdr, ln->ll_addr,
2078 ifp->if_addrlen);
2079 } else if (!olladdr && lladdr)
2080 llchange = 1;
2081 else
2082 llchange = 0;
2083
2084 /*
2085 * newentry olladdr lladdr llchange (*=record)
2086 * 0 n n -- (1)
2087 * 0 y n -- (2)
2088 * 0 n y y (3) * STALE
2089 * 0 y y n (4) *
2090 * 0 y y y (5) * STALE
2091 * 1 -- n -- (6) NOSTATE(= PASSIVE)
2092 * 1 -- y -- (7) * STALE
2093 */
2094
2095 do_update = 0;
2096 if (is_newentry == 0 && llchange != 0) {
2097 do_update = 1; /* (3,5) */
2098
2099 /*
2100 * Record source link-layer address
2101 * XXX is it dependent to ifp->if_type?
2102 */
2103 if (!nd6_try_set_entry_addr(ifp, ln, lladdr)) {
2104 /* Entry was deleted */
2105 LLE_WUNLOCK(ln);
2106 return;
2107 }
2108
2109 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE);
2110
2111 EVENTHANDLER_INVOKE(lle_event, ln, LLENTRY_RESOLVED);
2112
2113 if (ln->la_hold != NULL)
2114 chain = nd6_grab_holdchain(ln);
2115 }
2116
2117 /* Calculates new router status */
2118 router = nd6_is_router(type, code, is_newentry, olladdr,
2119 lladdr != NULL ? 1 : 0, ln->ln_router);
2120
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;
2125
2126 if (flags & LLE_EXCLUSIVE)
2127 LLE_WUNLOCK(ln);
2128 else
2129 LLE_RUNLOCK(ln);
2130
2131 if (chain != NULL)
2132 nd6_flush_holdchain(ifp, ln, chain);
2133 if (do_update)
2134 nd6_flush_children_holdchain(ifp, ln);
2135
2136 /*
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"
2141 * case?
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
2146 * time.
2147 * XXX: although defrouter_select_fib() should not have a bad effect
2148 * for those are not autoconfigured hosts, we explicitly avoid such
2149 * cases for safety.
2150 */
2151 if ((do_update || is_newentry) && router &&
2152 ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV) {
2153 /*
2154 * guaranteed recursion
2155 */
2156 defrouter_select_fib(ifp->if_fib);
2157 }
2158}
2159
2160static void
2161nd6_slowtimo(void *arg)
2162{
2163 struct epoch_tracker et;
2164 CURVNET_SET((struct vnet *) arg);
2165 struct nd_ifinfo *nd6if;
2166 struct ifnet *ifp;
2167
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)
2173 continue;
2174 nd6if = ND_IFINFO(ifp);
2175 if (nd6if->basereachable && /* already initialized */
2176 (nd6if->recalctm -= ND6_SLOWTIMER_INTERVAL) <= 0) {
2177 /*
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.
2181 * (RFC 2461, 6.3.4)
2182 */
2183 nd6if->recalctm = V_nd6_recalc_reachtm_interval;
2184 nd6if->reachable = ND_COMPUTE_RTIME(nd6if->basereachable);
2185 }
2186 }
2187 NET_EPOCH_EXIT(et);
2188 CURVNET_RESTORE();
2189}
2190
2191struct mbuf *
2192nd6_grab_holdchain(struct llentry *ln)
2193{
2194 struct mbuf *chain;
2195
2196 LLE_WLOCK_ASSERT(ln);
2197
2198 chain = ln->la_hold;
2199 ln->la_hold = NULL;
2200
2201 if (ln->ln_state == ND6_LLINFO_STALE) {
2202 /*
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.
2209 * (RFC 2461 7.3.3)
2210 */
2211 nd6_llinfo_setstate(ln, ND6_LLINFO_DELAY);
2212 }
2213
2214 return (chain);
2215}
2216
2217int
2218nd6_output_ifp(struct ifnet *ifp, struct ifnet *origifp, struct mbuf *m,
2219 struct sockaddr_in6 *dst, struct route *ro)
2220{
2221 int error;
2222 int ip6len;
2223 struct ip6_hdr *ip6;
2224 struct m_tag *mtag;
2225
2226#ifdef MAC
2227 mac_netinet6_nd6_send(ifp, m);
2228#endif
2229
2230 /*
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.
2236 */
2237 if (send_sendso_input_hook != NULL) {
2238 mtag = m_tag_find(m, PACKET_TAG_ND_OUTGOING, NULL);
2239 if (mtag != 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,
2244 ip6len);
2245 /* -1 == no app on SEND socket */
2246 if (error == 0 || error != -1)
2247 return (error);
2248 }
2249 }
2250
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 *));
2254
2255 if ((ifp->if_flags & IFF_LOOPBACK) == 0)
2256 origifp = ifp;
2257
2258 error = (*ifp->if_output)(origifp, m, (struct sockaddr *)dst, ro);
2259 return (error);
2260}
2261
2262/*
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.
2266 *
2267 * If destination LLE does not exists or lle state modification
2268 * is required, call "slow" version.
2269 *
2270 * Return values:
2271 * - 0 on success (address copied to buffer).
2272 * - EWOULDBLOCK (no local error, but address is still unresolved)
2273 * - other errors (alloc failure, etc)
2274 */
2275int
2276nd6_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)
2279{
2280 struct llentry *ln = NULL;
2281 const struct sockaddr_in6 *dst6;
2282
2283 NET_EPOCH_ASSERT();
2284
2285 if (pflags != NULL)
2286 *pflags = 0;
2287
2288 dst6 = (const struct sockaddr_in6 *)sa_dst;
2289
2290 /* discard the packet if IPv6 operation is disabled on the interface */
2291 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)) {
2292 m_freem(m);
2293 return (ENETDOWN); /* better error? */
2294 }
2295
2296 if (m != NULL && m->m_flags & M_MCAST) {
2297 switch (ifp->if_type) {
2298 case IFT_ETHER:
2299 case IFT_L2VLAN:
2300 case IFT_BRIDGE:
2301 ETHER_MAP_IPV6_MULTICAST(&dst6->sin6_addr,
2302 desten);
2303 return (0);
2304 default:
2305 m_freem(m);
2306 return (EAFNOSUPPORT);
2307 }
2308 }
2309
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);
2316 if (pflags != NULL)
2317 *pflags = LLE_VALID | (ln->r_flags & RLLE_IFADDR);
2318 llentry_provide_feedback(ln);
2319 if (plle) {
2320 LLE_ADDREF(ln);
2321 *plle = ln;
2322 LLE_WUNLOCK(ln);
2323 }
2324 return (0);
2325 } else if (plle && ln)
2326 LLE_WUNLOCK(ln);
2327
2328 return (nd6_resolve_slow(ifp, family, 0, m, dst6, desten, pflags, plle));
2329}
2330
2331/*
2332 * Finds or creates a new llentry for @addr and @family.
2333 * Returns wlocked llentry or NULL.
2334 *
2335 *
2336 * Child LLEs.
2337 *
2338 * Do not have their own state machine (gets marked as static)
2339 * settimer bails out for child LLEs just in case.
2340 *
2341 * Locking order: parent lle gets locked first, chen goes the child.
2342 */
2343static __noinline struct llentry *
2344nd6_get_llentry(struct ifnet *ifp, const struct in6_addr *addr, int family)
2345{
2346 struct llentry *child_lle = NULL;
2347 struct llentry *lle, *lle_tmp;
2348
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);
2354 return (NULL);
2355 }
2356 child_lle->r_family = family;
2357 child_lle->la_flags |= LLE_CHILD | LLE_STATIC;
2358 child_lle->ln_state = ND6_LLINFO_INCOMPLETE;
2359 }
2360
2361 if (lle == NULL) {
2362 char ip6buf[INET6_ADDRSTRLEN];
2363 log(LOG_DEBUG,
2364 "nd6_get_llentry: can't allocate llinfo for %s "
2365 "(ln=%p)\n",
2366 ip6_sprintf(ip6buf, addr), lle);
2367 return (NULL);
2368 }
2369
2370 IF_AFDATA_WLOCK(ifp);
2371 LLE_WLOCK(lle);
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);
2376 else {
2377 lltable_free_entry(LLTABLE6(ifp), lle);
2378 lle = lle_tmp;
2379 }
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) {
2385 /* Attach */
2386 lltable_link_child_entry(lle, child_lle);
2387 } else {
2388 /* child lle already exists, free newly-created one */
2389 lltable_free_entry(LLTABLE6(ifp), child_lle);
2390 child_lle = lle_tmp;
2391 }
2392 LLE_WUNLOCK(lle);
2393 lle = child_lle;
2394 }
2395 IF_AFDATA_WUNLOCK(ifp);
2396 return (lle);
2397}
2398
2399/*
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.
2403 *
2404 * Heavy version.
2405 * Function assume that destination LLE does not exist,
2406 * is invalid or stale, so LLE_EXCLUSIVE lock needs to be acquired.
2407 *
2408 * Set noinline to be dtrace-friendly
2409 */
2410static __noinline int
2411nd6_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)
2414{
2415 struct llentry *lle = NULL;
2416 struct in6_addr *psrc, src;
2417 int send_ns, ll_len;
2418 char *lladdr;
2419
2420 NET_EPOCH_ASSERT();
2421
2422 /*
2423 * Address resolution or Neighbor Unreachability Detection
2424 * for the next hop.
2425 * At this point, the destination of the packet must be a unicast
2426 * or an anycast address(i.e. not a multicast).
2427 */
2428 lle = nd6_lookup(&dst->sin6_addr, LLE_SF(family, LLE_EXCLUSIVE), ifp);
2429 if ((lle == NULL) && nd6_is_addr_neighbor(dst, ifp)) {
2430 /*
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.
2434 */
2435 lle = nd6_get_llentry(ifp, &dst->sin6_addr, family);
2436 }
2437
2438 if (lle == NULL) {
2439 m_freem(m);
2440 return (ENOBUFS);
2441 }
2442
2443 LLE_WLOCK_ASSERT(lle);
2444
2445 /*
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.
2450 * (RFC 2461 7.3.3)
2451 */
2452 if ((!(lle->la_flags & LLE_CHILD)) && (lle->ln_state == ND6_LLINFO_STALE))
2453 nd6_llinfo_setstate(lle, ND6_LLINFO_DELAY);
2454
2455 /*
2456 * If the neighbor cache entry has a state other than INCOMPLETE
2457 * (i.e. its link-layer address is already resolved), just
2458 * send the packet.
2459 */
2460 if (lle->ln_state > ND6_LLINFO_INCOMPLETE) {
2461 if (flags & LLE_ADDRONLY) {
2462 lladdr = lle->ll_addr;
2463 ll_len = ifp->if_addrlen;
2464 } else {
2465 lladdr = lle->r_linkdata;
2466 ll_len = lle->r_hdrlen;
2467 }
2468 bcopy(lladdr, desten, ll_len);
2469 if (pflags != NULL)
2470 *pflags = lle->la_flags;
2471 if (plle) {
2472 LLE_ADDREF(lle);
2473 *plle = lle;
2474 }
2475 LLE_WUNLOCK(lle);
2476 return (0);
2477 }
2478
2479 /*
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.
2484 */
2485
2486 if (lle->la_hold != NULL) {
2487 struct mbuf *m_hold;
2488 int i;
2489
2490 i = 0;
2491 for (m_hold = lle->la_hold; m_hold; m_hold = m_hold->m_nextpkt){
2492 i++;
2493 if (m_hold->m_nextpkt == NULL) {
2494 m_hold->m_nextpkt = m;
2495 break;
2496 }
2497 }
2498 while (i >= V_nd6_maxqueuelen) {
2499 m_hold = lle->la_hold;
2500 lle->la_hold = lle->la_hold->m_nextpkt;
2501 m_freem(m_hold);
2502 i--;
2503 }
2504 } else {
2505 lle->la_hold = m;
2506 }
2507
2508 /*
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.
2514 */
2515 psrc = NULL;
2516 send_ns = 0;
2517
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;
2521 LLE_WUNLOCK(lle);
2522 lle = lle_parent;
2523 LLE_WLOCK(lle);
2524 }
2525 if (lle->la_asked == 0) {
2526 lle->la_asked++;
2527 send_ns = 1;
2528 psrc = nd6_llinfo_get_holdsrc(lle, &src);
2529
2530 nd6_llinfo_setstate(lle, ND6_LLINFO_INCOMPLETE);
2531 }
2532 LLE_WUNLOCK(lle);
2533 if (send_ns != 0)
2534 nd6_ns_output(ifp, psrc, NULL, &dst->sin6_addr, NULL);
2535
2536 return (EWOULDBLOCK);
2537}
2538
2539/*
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.
2543 *
2544 * Return values:
2545 * - 0 on success (address copied to buffer).
2546 * - EWOULDBLOCK (no local error, but address is still unresolved)
2547 * - other errors (alloc failure, etc)
2548 */
2549int
2550nd6_resolve_addr(struct ifnet *ifp, int flags, const struct sockaddr *dst,
2551 char *desten, uint32_t *pflags)
2552{
2553 int error;
2554
2555 flags |= LLE_ADDRONLY;
2556 error = nd6_resolve_slow(ifp, AF_INET6, flags, NULL,
2557 (const struct sockaddr_in6 *)dst, desten, pflags, NULL);
2558 return (error);
2559}
2560
2561int
2562nd6_flush_holdchain(struct ifnet *ifp, struct llentry *lle, struct mbuf *chain)
2563{
2564 struct mbuf *m, *m_head;
2565 struct sockaddr_in6 dst6;
2566 int error = 0;
2567
2568 NET_EPOCH_ASSERT();
2569
2570 struct route_in6 ro = {
2571 .ro_prepend = lle->r_linkdata,
2572 .ro_plen = lle->r_hdrlen,
2573 };
2574
2575 lltable_fill_sa_entry(lle, (struct sockaddr *)&dst6);
2576 m_head = chain;
2577
2578 while (m_head) {
2579 m = m_head;
2580 m_head = m_head->m_nextpkt;
2581 m->m_nextpkt = NULL;
2582 error = nd6_output_ifp(ifp, ifp, m, &dst6, (struct route *)&ro);
2583 }
2584
2585 /*
2586 * XXX
2587 * note that intermediate errors are blindly ignored
2588 */
2589 return (error);
2590}
2591
2592__noinline void
2593nd6_flush_children_holdchain(struct ifnet *ifp, struct llentry *lle)
2594{
2595 struct llentry *child_lle;
2596 struct mbuf *chain;
2597
2598 NET_EPOCH_ASSERT();
2599
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);
2605 }
2606}
2607
2608static int
2609nd6_need_cache(struct ifnet *ifp)
2610{
2611 /*
2612 * XXX: we currently do not make neighbor cache on any interface
2613 * other than Ethernet and GIF.
2614 *
2615 * RFC2893 says:
2616 * - unidirectional tunnels needs no ND
2617 */
2618 switch (ifp->if_type) {
2619 case IFT_ETHER:
2620 case IFT_IEEE1394:
2621 case IFT_L2VLAN:
2622 case IFT_INFINIBAND:
2623 case IFT_BRIDGE:
2624 case IFT_PROPVIRTUAL:
2625 return (1);
2626 default:
2627 return (0);
2628 }
2629}
2630
2631/*
2632 * Add pernament ND6 link-layer record for given
2633 * interface address.
2634 *
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.
2640 *
2641 */
2642int
2643nd6_add_ifa_lle(struct in6_ifaddr *ia)
2644{
2645 struct ifnet *ifp;
2646 struct llentry *ln, *ln_tmp;
2647 struct sockaddr *dst;
2648
2649 ifp = ia->ia_ifa.ifa_ifp;
2650 if (nd6_need_cache(ifp) == 0)
2651 return (0);
2652
2653 dst = (struct sockaddr *)&ia->ia_addr;
2654 ln = lltable_alloc_entry(LLTABLE6(ifp), LLE_IFADDR, dst);
2655 if (ln == NULL)
2656 return (ENOBUFS);
2657
2658 IF_AFDATA_WLOCK(ifp);
2659 LLE_WLOCK(ln);
2660 /* Unlink any entry if exists */
2661 ln_tmp = lla_lookup(LLTABLE6(ifp), LLE_SF(AF_INET6, LLE_EXCLUSIVE), dst);
2662 if (ln_tmp != NULL)
2663 lltable_unlink_entry(LLTABLE6(ifp), ln_tmp);
2664 lltable_link_entry(LLTABLE6(ifp), ln);
2665 IF_AFDATA_WUNLOCK(ifp);
2666
2667 if (ln_tmp != NULL)
2668 EVENTHANDLER_INVOKE(lle_event, ln_tmp, LLENTRY_EXPIRED);
2669 EVENTHANDLER_INVOKE(lle_event, ln, LLENTRY_RESOLVED);
2670
2671 LLE_WUNLOCK(ln);
2672 if (ln_tmp != NULL)
2673 llentry_free(ln_tmp);
2674
2675 return (0);
2676}
2677
2678/*
2679 * Removes either all lle entries for given @ia, or lle
2680 * corresponding to @ia address.
2681 */
2682void
2683nd6_rem_ifa_lle(struct in6_ifaddr *ia, int all)
2684{
2685 struct sockaddr_in6 mask, addr;
2686 struct sockaddr *saddr, *smask;
2687 struct ifnet *ifp;
2688
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;
2694
2695 if (all != 0)
2696 lltable_prefix_free(AF_INET6, saddr, smask, LLE_STATIC);
2697 else
2698 lltable_delete_addr(LLTABLE6(ifp), LLE_IFADDR, saddr);
2699}
2700
2701static void
2702clear_llinfo_pqueue(struct llentry *ln)
2703{
2704 struct mbuf *m_hold, *m_hold_next;
2705
2706 for (m_hold = ln->la_hold; m_hold; m_hold = m_hold_next) {
2707 m_hold_next = m_hold->m_nextpkt;
2708 m_freem(m_hold);
2709 }
2710
2711 ln->la_hold = NULL;
2712}
2713
2714static int
2715nd6_sysctl_prlist(SYSCTL_HANDLER_ARGS)
2716{
2717 struct in6_prefix p;
2718 struct sockaddr_in6 s6;
2719 struct nd_prefix *pr;
2720 struct nd_pfxrouter *pfr;
2721 time_t maxexpire;
2722 int error;
2723 char ip6buf[INET6_ADDRSTRLEN];
2724
2725 if (req->newptr)
2726 return (EPERM);
2727
2728 error = sysctl_wire_old_buffer(req, 0);
2729 if (error != 0)
2730 return (error);
2731
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);
2737
2738 ND6_RLOCK();
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... */
2745 }
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)
2752 p.expire = 0;
2753 else {
2754 /* XXX: we assume time_t is signed. */
2755 maxexpire = (-1) &
2756 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
2757 if (pr->ndpr_vltime < maxexpire - pr->ndpr_lastupdate)
2758 p.expire = pr->ndpr_lastupdate +
2759 pr->ndpr_vltime +
2760 (time_second - time_uptime);
2761 else
2762 p.expire = maxexpire;
2763 }
2764 p.refcnt = pr->ndpr_addrcnt;
2765 p.flags = pr->ndpr_stateflags;
2766 p.advrtrs = 0;
2767 LIST_FOREACH(pfr, &pr->ndpr_advrtrs, pfr_entry)
2768 p.advrtrs++;
2769 error = SYSCTL_OUT(req, &p, sizeof(p));
2770 if (error != 0)
2771 break;
2772 LIST_FOREACH(pfr, &pr->ndpr_advrtrs, pfr_entry) {
2773 s6.sin6_addr = pfr->router->rtaddr;
2774 if (sa6_recoverscope(&s6))
2775 log(LOG_ERR,
2776 "scope error in prefix list (%s)\n",
2777 ip6_sprintf(ip6buf, &pfr->router->rtaddr));
2778 error = SYSCTL_OUT(req, &s6, sizeof(s6));
2779 if (error != 0)
2780 goto out;
2781 }
2782 }
2783out:
2784 ND6_RUNLOCK();
2785 return (error);
2786}
2787SYSCTL_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",
2790 "NDP prefix list");
2791SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_MAXQLEN, nd6_maxqueuelen,
2792 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_maxqueuelen), 1, "");
2793SYSCTL_INT(_net_inet6_icmp6, OID_AUTO, nd6_gctimer,
2794 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_gctimer), (60 * 60 * 24), "");
icmp6_error2
void icmp6_error2(struct mbuf *m, int type, int code, int param, struct ifnet *ifp)
Definition: icmp6.c:228
in6_setmaxmtu
void in6_setmaxmtu(void)
Definition: in6.c:2033
in6_purgeaddr
void in6_purgeaddr(struct ifaddr *ifa)
Definition: in6.c:1312
ip6_sprintf
char * ip6_sprintf(char *ip6buf, const struct in6_addr *addr)
Definition: in6.c:1637
in6_if_up
void in6_if_up(struct ifnet *ifp)
Definition: in6.c:1984
in6_addrscope
int in6_addrscope(const struct in6_addr *)
Definition: scope6.c:235
IN6_IS_ADDR_LINKLOCAL
#define IN6_IS_ADDR_LINKLOCAL(a)
Definition: in6.h:296
IN6_IS_ADDR_UNSPECIFIED
#define IN6_IS_ADDR_UNSPECIFIED(a)
Definition: in6.h:239
IN6_ARE_ADDR_EQUAL
#define IN6_ARE_ADDR_EQUAL(a, b)
Definition: in6.h:227
IFA6_IS_DEPRECATED
#define IFA6_IS_DEPRECATED(a)
Definition: in6.h:364
IFA6_IS_INVALID
#define IFA6_IS_INVALID(a)
Definition: in6.h:368
INET6_ADDRSTRLEN
#define INET6_ADDRSTRLEN
Definition: in6.h:112
in6_ifattach
void in6_ifattach(struct ifnet *ifp, struct ifnet *altifp)
Definition: in6_ifattach.c:675
in6_ifattach.h
in6_var.h
IN6_ARE_MASKED_ADDR_EQUAL
#define IN6_ARE_MASKED_ADDR_EQUAL(d, a, m)
Definition: in6_var.h:415
IN6_IFF_TENTATIVE
#define IN6_IFF_TENTATIVE
Definition: in6_var.h:494
SIOCGIFINFO_IN6
#define SIOCGIFINFO_IN6
Definition: in6_var.h:456
IN6_IFF_DEPRECATED
#define IN6_IFF_DEPRECATED
Definition: in6_var.h:497
SIOCGDEFIFACE_IN6
#define SIOCGDEFIFACE_IN6
Definition: in6_var.h:468
SIOCSIFINFO_IN6
#define SIOCSIFINFO_IN6
Definition: in6_var.h:457
SIOCSRTRFLUSH_IN6
#define SIOCSRTRFLUSH_IN6
Definition: in6_var.h:461
IN6_IFF_AUTOCONF
#define IN6_IFF_AUTOCONF
Definition: in6_var.h:499
SIOCSPFXFLUSH_IN6
#define SIOCSPFXFLUSH_IN6
Definition: in6_var.h:460
V_in6_ifaddrhead
#define V_in6_ifaddrhead
Definition: in6_var.h:515
OSIOCGIFINFO_IN6
#define OSIOCGIFINFO_IN6
Definition: in6_var.h:454
IN6_IFF_TEMPORARY
#define IN6_IFF_TEMPORARY
Definition: in6_var.h:500
PR_ORIG_RA
#define PR_ORIG_RA
Definition: in6_var.h:353
LLTABLE6
#define LLTABLE6(ifp)
Definition: in6_var.h:114
SIOCSNDFLUSH_IN6
#define SIOCSNDFLUSH_IN6
Definition: in6_var.h:458
SIOCGNBRINFO_IN6
#define SIOCGNBRINFO_IN6
Definition: in6_var.h:459
SIOCSIFINFO_FLAGS
#define SIOCSIFINFO_FLAGS
Definition: in6_var.h:470
V_in6_maxmtu
#define V_in6_maxmtu
Definition: in6_var.h:554
IN6_IFF_DUPLICATED
#define IN6_IFF_DUPLICATED
Definition: in6_var.h:495
IA6_IN6
#define IA6_IN6(ia)
Definition: in6_var.h:403
SIOCSDEFIFACE_IN6
#define SIOCSDEFIFACE_IN6
Definition: in6_var.h:467
sin6
static struct sockaddr_in6 sin6
Definition: ip6_mroute.c:672
ip6_var.h
V_ip6_accept_rtadv
#define V_ip6_accept_rtadv
Definition: ip6_var.h:303
V_ip6_auto_linklocal
#define V_ip6_auto_linklocal
Definition: ip6_var.h:315
V_ip6_use_tempaddr
#define V_ip6_use_tempaddr
Definition: ip6_var.h:321
V_ip6_no_radr
#define V_ip6_no_radr
Definition: ip6_var.h:304
V_ip6_dad_count
#define V_ip6_dad_count
Definition: ip6_var.h:310
nd6_free_children
static __noinline void nd6_free_children(struct llentry *lle)
Definition: nd6.c:1390
nd6_is_addr_neighbor
int nd6_is_addr_neighbor(const struct sockaddr_in6 *addr, struct ifnet *ifp)
Definition: nd6.c:1368
lle_event_eh
static eventhandler_tag lle_event_eh
Definition: nd6.c:120
nd6_lookup
struct llentry * nd6_lookup(const struct in6_addr *addr6, int flags, struct ifnet *ifp)
Definition: nd6.c:1192
nd6_is_stale
static int nd6_is_stale(struct llentry *lle, long *pdelay, int *do_switch)
Definition: nd6.c:622
nd6_lle_event
static void nd6_lle_event(void *arg __unused, struct llentry *lle, int evt)
Definition: nd6.c:155
V_nd6_timer_ch
#define V_nd6_timer_ch
Definition: nd6.c:150
nd6_add_ifa_lle
int nd6_add_ifa_lle(struct in6_ifaddr *ia)
Definition: nd6.c:2643
iflladdr_event_eh
static eventhandler_tag iflladdr_event_eh
Definition: nd6.c:120
MALLOC_DEFINE
MALLOC_DEFINE(M_IP6NDP, "ip6ndp", "IPv6 Neighbor Discovery")
nd6_timer
void nd6_timer(void *arg)
Definition: nd6.c:916
nd6_get_llentry
static __noinline struct llentry * nd6_get_llentry(struct ifnet *ifp, const struct in6_addr *addr, int family)
Definition: nd6.c:2344
nd6_cache_lladdr
void nd6_cache_lladdr(struct ifnet *ifp, struct in6_addr *from, char *lladdr, int lladdrlen, int type, int code)
Definition: nd6.c:1989
SYSCTL_PROC
SYSCTL_PROC(_net_inet6_icmp6, ICMPV6CTL_ND6_PRLIST, nd6_prlist, CTLTYPE_OPAQUE|CTLFLAG_RD|CTLFLAG_MPSAFE, NULL, 0, nd6_sysctl_prlist, "S,in6_prefix", "NDP prefix list")
nd6_subscription_cb
void nd6_subscription_cb(struct rib_head *rnh, struct rib_cmd_info *rc, void *arg)
Definition: nd6.c:1660
nd6_llinfo_setstate
__noinline void nd6_llinfo_setstate(struct llentry *lle, int newstate)
Definition: nd6.c:686
nd6_grab_holdchain
struct mbuf * nd6_grab_holdchain(struct llentry *ln)
Definition: nd6.c:2192
nd6_llinfo_timer
static void nd6_llinfo_timer(void *)
Definition: nd6.c:734
nd6_flush_holdchain
int nd6_flush_holdchain(struct ifnet *ifp, struct llentry *lle, struct mbuf *chain)
Definition: nd6.c:2562
V_nd6_maxndopt
#define V_nd6_maxndopt
Definition: nd6.c:111
ND
#define ND
nd6_output_ifp
int nd6_output_ifp(struct ifnet *ifp, struct ifnet *origifp, struct mbuf *m, struct sockaddr_in6 *dst, struct route *ro)
Definition: nd6.c:2218
ifnet_link_event_eh
static eventhandler_tag ifnet_link_event_eh
Definition: nd6.c:120
SYSCTL_DECL
SYSCTL_DECL(_net_inet6_icmp6)
nd6_need_cache
static int nd6_need_cache(struct ifnet *)
Definition: nd6.c:2609
nd6_is_new_addr_neighbor
static int nd6_is_new_addr_neighbor(const struct sockaddr_in6 *, struct ifnet *)
Definition: nd6.c:1233
ND6_RECALC_REACHTM_INTERVAL
#define ND6_RECALC_REACHTM_INTERVAL
Definition: nd6.c:88
nd6_slowtimo
static void nd6_slowtimo(void *)
Definition: nd6.c:2161
nd6_resolve
int nd6_resolve(struct ifnet *ifp, int gw_flags, struct mbuf *m, const struct sockaddr *sa_dst, u_char *desten, uint32_t *pflags, struct llentry **plle)
Definition: nd6.c:2276
V_nd6_slowtimo_ch
#define V_nd6_slowtimo_ch
Definition: nd6.c:147
regen_tmpaddr
static int regen_tmpaddr(struct in6_ifaddr *)
Definition: nd6.c:1079
__FBSDID
__FBSDID("$FreeBSD$")
nd6_llinfo_settimer_locked
static void nd6_llinfo_settimer_locked(struct llentry *, long)
Definition: nd6.c:527
nd6_resolve_slow
static int nd6_resolve_slow(struct ifnet *, int, int, struct mbuf *, const struct sockaddr_in6 *, u_char *, uint32_t *, struct llentry **)
Definition: nd6.c:2411
nd6_setmtu0
static void nd6_setmtu0(struct ifnet *, struct nd_ifinfo *)
Definition: nd6.c:347
nd6_alloc
static struct llentry * nd6_alloc(const struct in6_addr *addr6, int flags, struct ifnet *ifp)
Definition: nd6.c:1210
ND6_SLOWTIMER_INTERVAL
#define ND6_SLOWTIMER_INTERVAL
Definition: nd6.c:87
V_nd6_recalc_reachtm_interval
#define V_nd6_recalc_reachtm_interval
Definition: nd6.c:128
nd6_options
int nd6_options(union nd_opts *ndopts)
Definition: nd6.c:440
nd6_rem_ifa_lle
void nd6_rem_ifa_lle(struct in6_ifaddr *ia, int all)
Definition: nd6.c:2683
nd6_isdynrte
static int nd6_isdynrte(const struct rtentry *rt, const struct nhop_object *nh, void *xap)
Definition: nd6.c:1606
nd6_option
struct nd_opt_hdr * nd6_option(union nd_opts *ndopts)
Definition: nd6.c:390
nd6_ioctl
int nd6_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp)
Definition: nd6.c:1671
nd6_purge
void nd6_purge(struct ifnet *ifp)
Definition: nd6.c:1150
nd6_try_set_entry_addr
bool nd6_try_set_entry_addr(struct ifnet *ifp, struct llentry *lle, char *lladdr)
Definition: nd6.c:1441
send_sendso_input_hook
int(* send_sendso_input_hook)(struct mbuf *, struct ifnet *, int, int)
Definition: nd6.c:130
nd6_option_init
void nd6_option_init(void *opt, int icmp6len, union nd_opts *ndopts)
Definition: nd6.c:372
nd6_is_router
static int nd6_is_router(int type, int code, int is_new, int old_addr, int new_addr, int ln_router)
Definition: nd6.c:1906
nd6_llinfo_get_holdsrc
static __noinline struct in6_addr * nd6_llinfo_get_holdsrc(struct llentry *ln, struct in6_addr *src)
Definition: nd6.c:566
nd6_ifdetach
void nd6_ifdetach(struct ifnet *ifp, struct nd_ifinfo *nd)
Definition: nd6.c:314
nd6_free_redirect
static void nd6_free_redirect(const struct llentry *)
Definition: nd6.c:1620
VNET_DEFINE
VNET_DEFINE(int, nd6_prune)
nd6_sysctl_prlist
static int nd6_sysctl_prlist(SYSCTL_HANDLER_ARGS)
Definition: nd6.c:2715
V_nd6_maxqueuelen
#define V_nd6_maxqueuelen
Definition: nd6.c:112
nd6_resolve_addr
int nd6_resolve_addr(struct ifnet *ifp, int flags, const struct sockaddr *dst, char *desten, uint32_t *pflags)
Definition: nd6.c:2550
nd6_try_set_entry_addr_locked
static __noinline bool nd6_try_set_entry_addr_locked(struct ifnet *ifp, struct llentry *lle, char *lladdr)
Definition: nd6.c:1411
nd6_ifattach
struct nd_ifinfo * nd6_ifattach(struct ifnet *ifp)
Definition: nd6.c:264
VNET_DEFINE_STATIC
VNET_DEFINE_STATIC(int, nd6_maxndopt)
nd6_flush_children_holdchain
__noinline void nd6_flush_children_holdchain(struct ifnet *ifp, struct llentry *lle)
Definition: nd6.c:2593
nd6_init
void nd6_init(void)
Definition: nd6.c:218
nd6_free
static void nd6_free(struct llentry **, int)
Definition: nd6.c:1463
nd6_setmtu
void nd6_setmtu(struct ifnet *ifp)
Definition: nd6.c:337
nd6_iflladdr
static void nd6_iflladdr(void *arg __unused, struct ifnet *ifp)
Definition: nd6.c:209
check_release_defrouter
static void check_release_defrouter(struct rib_cmd_info *rc, void *_cbdata)
Definition: nd6.c:1643
clear_llinfo_pqueue
static void clear_llinfo_pqueue(struct llentry *)
Definition: nd6.c:2702
SYSCTL_INT
SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_MAXQLEN, nd6_maxqueuelen, CTLFLAG_VNET|CTLFLAG_RW, &VNET_NAME(nd6_maxqueuelen), 1, "")
ND6_ONLINK_LOCK
#define ND6_ONLINK_LOCK()
Definition: nd6.h:297
ND6_LLINFO_STALE
#define ND6_LLINFO_STALE
Definition: nd6.h:59
defrouter_rele
void defrouter_rele(struct nd_defrouter *)
Definition: nd6_rtr.c:122
ND6_LLINFO_PERMANENT
#define ND6_LLINFO_PERMANENT(n)
Definition: nd6.h:64
V_nd6_onlink_mtx
#define V_nd6_onlink_mtx
Definition: nd6.h:295
V_nd6_mmaxtries
#define V_nd6_mmaxtries
Definition: nd6.h:269
defrouter_select_fib
void defrouter_select_fib(int fibnum)
Definition: nd6_rtr.c:944
ND6_LLINFO_INCOMPLETE
#define ND6_LLINFO_INCOMPLETE
Definition: nd6.h:57
nd6_setdefaultiface
int nd6_setdefaultiface(int)
Definition: nd6_rtr.c:2426
V_nd6_gctimer
#define V_nd6_gctimer
Definition: nd6.h:272
ND6_LLINFO_DELAY
#define ND6_LLINFO_DELAY
Definition: nd6.h:60
pfxlist_onlink_check
void pfxlist_onlink_check(void)
Definition: nd6_rtr.c:1844
ND6_IFF_PERFORMNUD
#define ND6_IFF_PERFORMNUD
Definition: nd6.h:82
ND_COMPUTE_RTIME
#define ND_COMPUTE_RTIME(x)
Definition: nd6.h:190
nd6_ns_output
void nd6_ns_output(struct ifnet *, const struct in6_addr *, const struct in6_addr *, const struct in6_addr *, uint8_t *)
Definition: nd6_nbr.c:609
V_nd_prefix
#define V_nd_prefix
Definition: nd6.h:273
IN6_LINKMTU
#define IN6_LINKMTU(ifp)
Definition: nd6.h:101
ND6_RLOCK
#define ND6_RLOCK()
Definition: nd6.h:283
nd6_dad_start
void nd6_dad_start(struct ifaddr *, int)
Definition: nd6_nbr.c:1248
ND6_IFF_AUTO_LINKLOCAL
#define ND6_IFF_AUTO_LINKLOCAL
Definition: nd6.h:87
nd6_prefix_ref
void nd6_prefix_ref(struct nd_prefix *)
Definition: nd6_rtr.c:1337
nd6_dad_stop
void nd6_dad_stop(struct ifaddr *)
Definition: nd6_nbr.c:1324
nd6_prefix_unlink
void nd6_prefix_unlink(struct nd_prefix *, struct nd_prhead *)
Definition: nd6_rtr.c:1420
nd6_defrouter_init
void nd6_defrouter_init(void)
Definition: nd6_rtr.c:2538
nd6_prefix_rele
void nd6_prefix_rele(struct nd_prefix *)
Definition: nd6_rtr.c:1344
ND6_LLINFO_NOSTATE
#define ND6_LLINFO_NOSTATE
Definition: nd6.h:48
nd6log
#define nd6log(x)
Definition: nd6.h:303
rt6_flush
void rt6_flush(struct in6_addr *, struct ifnet *)
Definition: nd6_rtr.c:2414
ND_IFINFO
#define ND_IFINFO(ifp)
Definition: nd6.h:99
nd6_defrouter_flush_all
void nd6_defrouter_flush_all(void)
Definition: nd6_rtr.c:2519
NDPRF_ONLINK
#define NDPRF_ONLINK
Definition: nd6.h:169
defrouter_reset
void defrouter_reset(void)
Definition: nd6_rtr.c:829
ND6_IFF_IFDISABLED
#define ND6_IFF_IFDISABLED
Definition: nd6.h:85
ND6_LLINFO_REACHABLE
#define ND6_LLINFO_REACHABLE
Definition: nd6.h:58
ND6_IFF_NO_DAD
#define ND6_IFF_NO_DAD
Definition: nd6.h:90
V_nd6_defifindex
#define V_nd6_defifindex
Definition: nd6.h:311
V_nd6_prune
#define V_nd6_prune
Definition: nd6.h:266
ND6_LLINFO_PROBE
#define ND6_LLINFO_PROBE
Definition: nd6.h:61
V_nd6_delay
#define V_nd6_delay
Definition: nd6.h:267
ND6_ONLINK_UNLOCK
#define ND6_ONLINK_UNLOCK()
Definition: nd6.h:299
REACHABLE_TIME
#define REACHABLE_TIME
Definition: nd6.h:182
defrouter_lookup
struct nd_defrouter * defrouter_lookup(const struct in6_addr *, struct ifnet *)
Definition: nd6_rtr.c:815
nd6_defrouter_timer
void nd6_defrouter_timer(void)
Definition: nd6_rtr.c:2464
ND6_INFINITE_LIFETIME
#define ND6_INFINITE_LIFETIME
Definition: nd6.h:177
V_nd6_list_genid
#define V_nd6_list_genid
Definition: nd6.h:281
V_nd6_lock
#define V_nd6_lock
Definition: nd6.h:280
V_nd6_umaxtries
#define V_nd6_umaxtries
Definition: nd6.h:268
nd6_ifnet_link_event
void nd6_ifnet_link_event(void *, struct ifnet *, int)
ND6_IFF_ACCEPT_RTADV
#define ND6_IFF_ACCEPT_RTADV
Definition: nd6.h:83
ND6_RUNLOCK
#define ND6_RUNLOCK()
Definition: nd6.h:284
defrouter_lookup_locked
struct nd_defrouter * defrouter_lookup_locked(const struct in6_addr *, struct ifnet *)
Definition: nd6_rtr.c:801
ND6_WLOCK
#define ND6_WLOCK()
Definition: nd6.h:285
nd6_dad_init
void nd6_dad_init(void)
Definition: nd6_nbr.c:1238
ND6_RLOCK_ASSERT
#define ND6_RLOCK_ASSERT()
Definition: nd6.h:289
ND6_WUNLOCK
#define ND6_WUNLOCK()
Definition: nd6.h:286
nd6_prefix_del
void nd6_prefix_del(struct nd_prefix *)
Definition: nd6_rtr.c:1435
ND6_IFF_NO_RADR
#define ND6_IFF_NO_RADR
Definition: nd6.h:88
nd6_defrouter_purge
void nd6_defrouter_purge(struct ifnet *)
Definition: nd6_rtr.c:2489
nd6_defrouter_list_empty
bool nd6_defrouter_list_empty(void)
Definition: nd6_rtr.c:2457
in6_tmpifadd
int in6_tmpifadd(const struct in6_ifaddr *, int, int)
Definition: nd6_rtr.c:2254
RETRANS_TIMER
#define RETRANS_TIMER
Definition: nd6.h:183
nd6_prefix_offlink
int nd6_prefix_offlink(struct nd_prefix *)
Definition: nd6_rtr.c:2164
MAX_RTR_SOLICITATION_DELAY
#define MAX_RTR_SOLICITATION_DELAY
Definition: nd6.h:173
in6_setscope
int in6_setscope(struct in6_addr *in6, struct ifnet *ifp, u_int32_t *ret_id)
Definition: scope6.c:406
sa6_recoverscope
int sa6_recoverscope(struct sockaddr_in6 *sin6)
Definition: scope6.c:361
in6_getscopezone
uint32_t in6_getscopezone(const struct ifnet *ifp, int scope)
Definition: scope6.c:518
scope6_var.h
SND_OUT
#define SND_OUT
Definition: send.h:34
in6_addr
Definition: in6.h:97
in6_ifaddr
Definition: in6_var.h:121
in6_ifaddr::ia6_flags
int ia6_flags
Definition: in6_var.h:131
in6_ifaddr::ia_addr
struct sockaddr_in6 ia_addr
Definition: in6_var.h:125
in6_ifaddr::ia_ifa
struct ifaddr ia_ifa
Definition: in6_var.h:122
in6_ifaddr::ia6_ndpr
struct nd_prefix * ia6_ndpr
Definition: in6_var.h:140
in6_ifaddr::ia_prefixmask
struct sockaddr_in6 ia_prefixmask
Definition: in6_var.h:128
in6_nbrinfo
Definition: nd6.h:108
in6_nbrinfo::state
int state
Definition: nd6.h:113
in6_nbrinfo::expire
int expire
Definition: nd6.h:114
in6_nbrinfo::asked
long asked
Definition: nd6.h:111
in6_nbrinfo::isrouter
int isrouter
Definition: nd6.h:112
in6_nbrinfo::addr
struct in6_addr addr
Definition: nd6.h:110
in6_ndifreq
Definition: nd6.h:163
in6_ndifreq::ifindex
u_long ifindex
Definition: nd6.h:165
in6_ndireq
Definition: nd6.h:158
in6_ndireq::ndi
struct nd_ifinfo ndi
Definition: nd6.h:160
in6_prefix
Definition: nd6.h:126
in6_prefix::pltime
u_int32_t pltime
Definition: nd6.h:132
in6_prefix::prefix
struct sockaddr_in6 prefix
Definition: nd6.h:127
in6_prefix::expire
time_t expire
Definition: nd6.h:133
in6_prefix::origin
u_char origin
Definition: nd6.h:130
in6_prefix::if_index
u_short if_index
Definition: nd6.h:136
in6_prefix::refcnt
int refcnt
Definition: nd6.h:135
in6_prefix::raflags
struct prf_ra raflags
Definition: nd6.h:128
in6_prefix::prefixlen
u_char prefixlen
Definition: nd6.h:129
in6_prefix::flags
u_int32_t flags
Definition: nd6.h:134
in6_prefix::advrtrs
u_short advrtrs
Definition: nd6.h:137
in6_prefix::vltime
u_int32_t vltime
Definition: nd6.h:131
nd_defrouter
Definition: nd6.h:194
nd_defrouter::rtaddr
struct in6_addr rtaddr
Definition: nd6.h:196
nd_defrouter::ifp
struct ifnet * ifp
Definition: nd6.h:200
nd_defrouter::expire
u_long expire
Definition: nd6.h:199
nd_defrouter::installed
int installed
Definition: nd6.h:201
nd_ifinfo
Definition: nd6.h:66
nd_ifinfo::basereachable
u_int32_t basereachable
Definition: nd6.h:69
nd_ifinfo::maxmtu
u_int32_t maxmtu
Definition: nd6.h:68
nd_ifinfo::recalctm
int recalctm
Definition: nd6.h:73
nd_ifinfo::retrans
u_int32_t retrans
Definition: nd6.h:71
nd_ifinfo::flags
u_int32_t flags
Definition: nd6.h:72
nd_ifinfo::initialized
u_int8_t initialized
Definition: nd6.h:75
nd_ifinfo::chlim
u_int8_t chlim
Definition: nd6.h:74
nd_ifinfo::reachable
u_int32_t reachable
Definition: nd6.h:70
nd_pfxrouter
Definition: nd6.h:246
nd_pfxrouter::router
struct nd_defrouter * router
Definition: nd6.h:248
nd_prefix
Definition: nd6.h:219
nd_prefix::ndpr_stateflags
u_int32_t ndpr_stateflags
Definition: nd6.h:233
nd_prefix::ndpr_prefix
struct sockaddr_in6 ndpr_prefix
Definition: nd6.h:222
nd_prefix::ndpr_pltime
u_int32_t ndpr_pltime
Definition: nd6.h:226
nd_prefix::ndpr_vltime
u_int32_t ndpr_vltime
Definition: nd6.h:225
nd_prefix::ndpr_ifp
struct ifnet * ndpr_ifp
Definition: nd6.h:220
nd_prefix::ndpr_mask
struct in6_addr ndpr_mask
Definition: nd6.h:223
nd_prefix::ndpr_lastupdate
time_t ndpr_lastupdate
Definition: nd6.h:230
nd_prefix::ndpr_plen
u_char ndpr_plen
Definition: nd6.h:236
nd_prefix::ndpr_addrcnt
int ndpr_addrcnt
Definition: nd6.h:237
sockaddr_in6
Definition: in6.h:125
sockaddr_in6::sin6_len
uint8_t sin6_len
Definition: in6.h:126
sockaddr_in6::sin6_addr
struct in6_addr sin6_addr
Definition: in6.h:130
sockaddr_in6::sin6_scope_id
uint32_t sin6_scope_id
Definition: in6.h:131
sockaddr_in6::sin6_family
sa_family_t sin6_family
Definition: in6.h:127
nd_opts
Definition: nd6.h:317
nd_opts::nd_opt_array
struct nd_opt_hdr * nd_opt_array[16]
Definition: nd6.h:318