nd6.c revision 287733
1/*- 2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the project nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $KAME: nd6.c,v 1.144 2001/05/24 07:44:00 itojun Exp $ 30 */ 31 32#include <sys/cdefs.h> 33__FBSDID("$FreeBSD: stable/10/sys/netinet6/nd6.c 287733 2015-09-13 01:59:50Z hrs $"); 34 35#include "opt_inet.h" 36#include "opt_inet6.h" 37#include "opt_kdtrace.h" 38 39#include <sys/param.h> 40#include <sys/systm.h> 41#include <sys/callout.h> 42#include <sys/malloc.h> 43#include <sys/mbuf.h> 44#include <sys/socket.h> 45#include <sys/sockio.h> 46#include <sys/time.h> 47#include <sys/kernel.h> 48#include <sys/protosw.h> 49#include <sys/errno.h> 50#include <sys/syslog.h> 51#include <sys/lock.h> 52#include <sys/rwlock.h> 53#include <sys/queue.h> 54#include <sys/sdt.h> 55#include <sys/sysctl.h> 56 57#include <net/if.h> 58#include <net/if_arc.h> 59#include <net/if_dl.h> 60#include <net/if_types.h> 61#include <net/iso88025.h> 62#include <net/fddi.h> 63#include <net/route.h> 64#include <net/vnet.h> 65 66#include <netinet/in.h> 67#include <netinet/in_kdtrace.h> 68#include <net/if_llatbl.h> 69#define L3_ADDR_SIN6(le) ((struct sockaddr_in6 *) L3_ADDR(le)) 70#include <netinet/if_ether.h> 71#include <netinet6/in6_var.h> 72#include <netinet/ip6.h> 73#include <netinet6/ip6_var.h> 74#include <netinet6/scope6_var.h> 75#include <netinet6/nd6.h> 76#include <netinet6/in6_ifattach.h> 77#include <netinet/icmp6.h> 78#include <netinet6/send.h> 79 80#include <sys/limits.h> 81 82#include <security/mac/mac_framework.h> 83 84#define ND6_SLOWTIMER_INTERVAL (60 * 60) /* 1 hour */ 85#define ND6_RECALC_REACHTM_INTERVAL (60 * 120) /* 2 hours */ 86 87#define SIN6(s) ((const struct sockaddr_in6 *)(s)) 88 89/* timer values */ 90VNET_DEFINE(int, nd6_prune) = 1; /* walk list every 1 seconds */ 91VNET_DEFINE(int, nd6_delay) = 5; /* delay first probe time 5 second */ 92VNET_DEFINE(int, nd6_umaxtries) = 3; /* maximum unicast query */ 93VNET_DEFINE(int, nd6_mmaxtries) = 3; /* maximum multicast query */ 94VNET_DEFINE(int, nd6_useloopback) = 1; /* use loopback interface for 95 * local traffic */ 96VNET_DEFINE(int, nd6_gctimer) = (60 * 60 * 24); /* 1 day: garbage 97 * collection timer */ 98 99/* preventing too many loops in ND option parsing */ 100static VNET_DEFINE(int, nd6_maxndopt) = 10; /* max # of ND options allowed */ 101 102VNET_DEFINE(int, nd6_maxnudhint) = 0; /* max # of subsequent upper 103 * layer hints */ 104static VNET_DEFINE(int, nd6_maxqueuelen) = 1; /* max pkts cached in unresolved 105 * ND entries */ 106#define V_nd6_maxndopt VNET(nd6_maxndopt) 107#define V_nd6_maxqueuelen VNET(nd6_maxqueuelen) 108 109#ifdef ND6_DEBUG 110VNET_DEFINE(int, nd6_debug) = 1; 111#else 112VNET_DEFINE(int, nd6_debug) = 0; 113#endif 114 115/* for debugging? */ 116#if 0 117static int nd6_inuse, nd6_allocated; 118#endif 119 120VNET_DEFINE(struct nd_drhead, nd_defrouter); 121VNET_DEFINE(struct nd_prhead, nd_prefix); 122 123VNET_DEFINE(int, nd6_recalc_reachtm_interval) = ND6_RECALC_REACHTM_INTERVAL; 124#define V_nd6_recalc_reachtm_interval VNET(nd6_recalc_reachtm_interval) 125 126int (*send_sendso_input_hook)(struct mbuf *, struct ifnet *, int, int); 127 128static int nd6_is_new_addr_neighbor(struct sockaddr_in6 *, 129 struct ifnet *); 130static void nd6_setmtu0(struct ifnet *, struct nd_ifinfo *); 131static void nd6_slowtimo(void *); 132static int regen_tmpaddr(struct in6_ifaddr *); 133static struct llentry *nd6_free(struct llentry *, int); 134static void nd6_llinfo_timer(void *); 135static void clear_llinfo_pqueue(struct llentry *); 136static int nd6_output_lle(struct ifnet *, struct ifnet *, struct mbuf *, 137 struct sockaddr_in6 *); 138static int nd6_output_ifp(struct ifnet *, struct ifnet *, struct mbuf *, 139 struct sockaddr_in6 *); 140 141static VNET_DEFINE(struct callout, nd6_slowtimo_ch); 142#define V_nd6_slowtimo_ch VNET(nd6_slowtimo_ch) 143 144VNET_DEFINE(struct callout, nd6_timer_ch); 145 146void 147nd6_init(void) 148{ 149 150 LIST_INIT(&V_nd_prefix); 151 152 /* initialization of the default router list */ 153 TAILQ_INIT(&V_nd_defrouter); 154 155 /* start timer */ 156 callout_init(&V_nd6_slowtimo_ch, 0); 157 callout_reset(&V_nd6_slowtimo_ch, ND6_SLOWTIMER_INTERVAL * hz, 158 nd6_slowtimo, curvnet); 159 160 nd6_dad_init(); 161} 162 163#ifdef VIMAGE 164void 165nd6_destroy() 166{ 167 168 callout_drain(&V_nd6_slowtimo_ch); 169 callout_drain(&V_nd6_timer_ch); 170} 171#endif 172 173struct nd_ifinfo * 174nd6_ifattach(struct ifnet *ifp) 175{ 176 struct nd_ifinfo *nd; 177 178 nd = (struct nd_ifinfo *)malloc(sizeof(*nd), M_IP6NDP, M_WAITOK|M_ZERO); 179 nd->initialized = 1; 180 181 nd->chlim = IPV6_DEFHLIM; 182 nd->basereachable = REACHABLE_TIME; 183 nd->reachable = ND_COMPUTE_RTIME(nd->basereachable); 184 nd->retrans = RETRANS_TIMER; 185 186 nd->flags = ND6_IFF_PERFORMNUD; 187 188 /* A loopback interface always has ND6_IFF_AUTO_LINKLOCAL. 189 * XXXHRS: Clear ND6_IFF_AUTO_LINKLOCAL on an IFT_BRIDGE interface by 190 * default regardless of the V_ip6_auto_linklocal configuration to 191 * give a reasonable default behavior. 192 */ 193 if ((V_ip6_auto_linklocal && ifp->if_type != IFT_BRIDGE) || 194 (ifp->if_flags & IFF_LOOPBACK)) 195 nd->flags |= ND6_IFF_AUTO_LINKLOCAL; 196 /* 197 * A loopback interface does not need to accept RTADV. 198 * XXXHRS: Clear ND6_IFF_ACCEPT_RTADV on an IFT_BRIDGE interface by 199 * default regardless of the V_ip6_accept_rtadv configuration to 200 * prevent the interface from accepting RA messages arrived 201 * on one of the member interfaces with ND6_IFF_ACCEPT_RTADV. 202 */ 203 if (V_ip6_accept_rtadv && 204 !(ifp->if_flags & IFF_LOOPBACK) && 205 (ifp->if_type != IFT_BRIDGE)) 206 nd->flags |= ND6_IFF_ACCEPT_RTADV; 207 if (V_ip6_no_radr && !(ifp->if_flags & IFF_LOOPBACK)) 208 nd->flags |= ND6_IFF_NO_RADR; 209 210 /* XXX: we cannot call nd6_setmtu since ifp is not fully initialized */ 211 nd6_setmtu0(ifp, nd); 212 213 return nd; 214} 215 216void 217nd6_ifdetach(struct nd_ifinfo *nd) 218{ 219 220 free(nd, M_IP6NDP); 221} 222 223/* 224 * Reset ND level link MTU. This function is called when the physical MTU 225 * changes, which means we might have to adjust the ND level MTU. 226 */ 227void 228nd6_setmtu(struct ifnet *ifp) 229{ 230 231 nd6_setmtu0(ifp, ND_IFINFO(ifp)); 232} 233 234/* XXX todo: do not maintain copy of ifp->if_mtu in ndi->maxmtu */ 235void 236nd6_setmtu0(struct ifnet *ifp, struct nd_ifinfo *ndi) 237{ 238 u_int32_t omaxmtu; 239 240 omaxmtu = ndi->maxmtu; 241 242 switch (ifp->if_type) { 243 case IFT_ARCNET: 244 ndi->maxmtu = MIN(ARC_PHDS_MAXMTU, ifp->if_mtu); /* RFC2497 */ 245 break; 246 case IFT_FDDI: 247 ndi->maxmtu = MIN(FDDIIPMTU, ifp->if_mtu); /* RFC2467 */ 248 break; 249 case IFT_ISO88025: 250 ndi->maxmtu = MIN(ISO88025_MAX_MTU, ifp->if_mtu); 251 break; 252 default: 253 ndi->maxmtu = ifp->if_mtu; 254 break; 255 } 256 257 /* 258 * Decreasing the interface MTU under IPV6 minimum MTU may cause 259 * undesirable situation. We thus notify the operator of the change 260 * explicitly. The check for omaxmtu is necessary to restrict the 261 * log to the case of changing the MTU, not initializing it. 262 */ 263 if (omaxmtu >= IPV6_MMTU && ndi->maxmtu < IPV6_MMTU) { 264 log(LOG_NOTICE, "nd6_setmtu0: " 265 "new link MTU on %s (%lu) is too small for IPv6\n", 266 if_name(ifp), (unsigned long)ndi->maxmtu); 267 } 268 269 if (ndi->maxmtu > V_in6_maxmtu) 270 in6_setmaxmtu(); /* check all interfaces just in case */ 271 272} 273 274void 275nd6_option_init(void *opt, int icmp6len, union nd_opts *ndopts) 276{ 277 278 bzero(ndopts, sizeof(*ndopts)); 279 ndopts->nd_opts_search = (struct nd_opt_hdr *)opt; 280 ndopts->nd_opts_last 281 = (struct nd_opt_hdr *)(((u_char *)opt) + icmp6len); 282 283 if (icmp6len == 0) { 284 ndopts->nd_opts_done = 1; 285 ndopts->nd_opts_search = NULL; 286 } 287} 288 289/* 290 * Take one ND option. 291 */ 292struct nd_opt_hdr * 293nd6_option(union nd_opts *ndopts) 294{ 295 struct nd_opt_hdr *nd_opt; 296 int olen; 297 298 KASSERT(ndopts != NULL, ("%s: ndopts == NULL", __func__)); 299 KASSERT(ndopts->nd_opts_last != NULL, ("%s: uninitialized ndopts", 300 __func__)); 301 if (ndopts->nd_opts_search == NULL) 302 return NULL; 303 if (ndopts->nd_opts_done) 304 return NULL; 305 306 nd_opt = ndopts->nd_opts_search; 307 308 /* make sure nd_opt_len is inside the buffer */ 309 if ((caddr_t)&nd_opt->nd_opt_len >= (caddr_t)ndopts->nd_opts_last) { 310 bzero(ndopts, sizeof(*ndopts)); 311 return NULL; 312 } 313 314 olen = nd_opt->nd_opt_len << 3; 315 if (olen == 0) { 316 /* 317 * Message validation requires that all included 318 * options have a length that is greater than zero. 319 */ 320 bzero(ndopts, sizeof(*ndopts)); 321 return NULL; 322 } 323 324 ndopts->nd_opts_search = (struct nd_opt_hdr *)((caddr_t)nd_opt + olen); 325 if (ndopts->nd_opts_search > ndopts->nd_opts_last) { 326 /* option overruns the end of buffer, invalid */ 327 bzero(ndopts, sizeof(*ndopts)); 328 return NULL; 329 } else if (ndopts->nd_opts_search == ndopts->nd_opts_last) { 330 /* reached the end of options chain */ 331 ndopts->nd_opts_done = 1; 332 ndopts->nd_opts_search = NULL; 333 } 334 return nd_opt; 335} 336 337/* 338 * Parse multiple ND options. 339 * This function is much easier to use, for ND routines that do not need 340 * multiple options of the same type. 341 */ 342int 343nd6_options(union nd_opts *ndopts) 344{ 345 struct nd_opt_hdr *nd_opt; 346 int i = 0; 347 348 KASSERT(ndopts != NULL, ("%s: ndopts == NULL", __func__)); 349 KASSERT(ndopts->nd_opts_last != NULL, ("%s: uninitialized ndopts", 350 __func__)); 351 if (ndopts->nd_opts_search == NULL) 352 return 0; 353 354 while (1) { 355 nd_opt = nd6_option(ndopts); 356 if (nd_opt == NULL && ndopts->nd_opts_last == NULL) { 357 /* 358 * Message validation requires that all included 359 * options have a length that is greater than zero. 360 */ 361 ICMP6STAT_INC(icp6s_nd_badopt); 362 bzero(ndopts, sizeof(*ndopts)); 363 return -1; 364 } 365 366 if (nd_opt == NULL) 367 goto skip1; 368 369 switch (nd_opt->nd_opt_type) { 370 case ND_OPT_SOURCE_LINKADDR: 371 case ND_OPT_TARGET_LINKADDR: 372 case ND_OPT_MTU: 373 case ND_OPT_REDIRECTED_HEADER: 374 case ND_OPT_NONCE: 375 if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) { 376 nd6log((LOG_INFO, 377 "duplicated ND6 option found (type=%d)\n", 378 nd_opt->nd_opt_type)); 379 /* XXX bark? */ 380 } else { 381 ndopts->nd_opt_array[nd_opt->nd_opt_type] 382 = nd_opt; 383 } 384 break; 385 case ND_OPT_PREFIX_INFORMATION: 386 if (ndopts->nd_opt_array[nd_opt->nd_opt_type] == 0) { 387 ndopts->nd_opt_array[nd_opt->nd_opt_type] 388 = nd_opt; 389 } 390 ndopts->nd_opts_pi_end = 391 (struct nd_opt_prefix_info *)nd_opt; 392 break; 393 /* What about ND_OPT_ROUTE_INFO? RFC 4191 */ 394 case ND_OPT_RDNSS: /* RFC 6106 */ 395 case ND_OPT_DNSSL: /* RFC 6106 */ 396 /* 397 * Silently ignore options we know and do not care about 398 * in the kernel. 399 */ 400 break; 401 default: 402 /* 403 * Unknown options must be silently ignored, 404 * to accomodate future extension to the protocol. 405 */ 406 nd6log((LOG_DEBUG, 407 "nd6_options: unsupported option %d - " 408 "option ignored\n", nd_opt->nd_opt_type)); 409 } 410 411skip1: 412 i++; 413 if (i > V_nd6_maxndopt) { 414 ICMP6STAT_INC(icp6s_nd_toomanyopt); 415 nd6log((LOG_INFO, "too many loop in nd opt\n")); 416 break; 417 } 418 419 if (ndopts->nd_opts_done) 420 break; 421 } 422 423 return 0; 424} 425 426/* 427 * ND6 timer routine to handle ND6 entries 428 */ 429void 430nd6_llinfo_settimer_locked(struct llentry *ln, long tick) 431{ 432 int canceled; 433 434 LLE_WLOCK_ASSERT(ln); 435 436 if (tick < 0) { 437 ln->la_expire = 0; 438 ln->ln_ntick = 0; 439 canceled = callout_stop(&ln->ln_timer_ch); 440 } else { 441 ln->la_expire = time_uptime + tick / hz; 442 LLE_ADDREF(ln); 443 if (tick > INT_MAX) { 444 ln->ln_ntick = tick - INT_MAX; 445 canceled = callout_reset(&ln->ln_timer_ch, INT_MAX, 446 nd6_llinfo_timer, ln); 447 } else { 448 ln->ln_ntick = 0; 449 canceled = callout_reset(&ln->ln_timer_ch, tick, 450 nd6_llinfo_timer, ln); 451 } 452 } 453 if (canceled) 454 LLE_REMREF(ln); 455} 456 457void 458nd6_llinfo_settimer(struct llentry *ln, long tick) 459{ 460 461 LLE_WLOCK(ln); 462 nd6_llinfo_settimer_locked(ln, tick); 463 LLE_WUNLOCK(ln); 464} 465 466static void 467nd6_llinfo_timer(void *arg) 468{ 469 struct llentry *ln; 470 struct in6_addr *dst; 471 struct ifnet *ifp; 472 struct nd_ifinfo *ndi = NULL; 473 474 KASSERT(arg != NULL, ("%s: arg NULL", __func__)); 475 ln = (struct llentry *)arg; 476 LLE_WLOCK(ln); 477 if (callout_pending(&ln->la_timer)) { 478 /* 479 * Here we are a bit odd here in the treatment of 480 * active/pending. If the pending bit is set, it got 481 * rescheduled before I ran. The active 482 * bit we ignore, since if it was stopped 483 * in ll_tablefree() and was currently running 484 * it would have return 0 so the code would 485 * not have deleted it since the callout could 486 * not be stopped so we want to go through 487 * with the delete here now. If the callout 488 * was restarted, the pending bit will be back on and 489 * we just want to bail since the callout_reset would 490 * return 1 and our reference would have been removed 491 * by nd6_llinfo_settimer_locked above since canceled 492 * would have been 1. 493 */ 494 LLE_WUNLOCK(ln); 495 return; 496 } 497 ifp = ln->lle_tbl->llt_ifp; 498 CURVNET_SET(ifp->if_vnet); 499 500 if (ln->ln_ntick > 0) { 501 if (ln->ln_ntick > INT_MAX) { 502 ln->ln_ntick -= INT_MAX; 503 nd6_llinfo_settimer_locked(ln, INT_MAX); 504 } else { 505 ln->ln_ntick = 0; 506 nd6_llinfo_settimer_locked(ln, ln->ln_ntick); 507 } 508 goto done; 509 } 510 511 ndi = ND_IFINFO(ifp); 512 dst = &L3_ADDR_SIN6(ln)->sin6_addr; 513 if (ln->la_flags & LLE_STATIC) { 514 goto done; 515 } 516 517 if (ln->la_flags & LLE_DELETED) { 518 (void)nd6_free(ln, 0); 519 ln = NULL; 520 goto done; 521 } 522 523 switch (ln->ln_state) { 524 case ND6_LLINFO_INCOMPLETE: 525 if (ln->la_asked < V_nd6_mmaxtries) { 526 ln->la_asked++; 527 nd6_llinfo_settimer_locked(ln, (long)ndi->retrans * hz / 1000); 528 LLE_WUNLOCK(ln); 529 nd6_ns_output(ifp, NULL, dst, ln, NULL); 530 LLE_WLOCK(ln); 531 } else { 532 struct mbuf *m = ln->la_hold; 533 if (m) { 534 struct mbuf *m0; 535 536 /* 537 * assuming every packet in la_hold has the 538 * same IP header. Send error after unlock. 539 */ 540 m0 = m->m_nextpkt; 541 m->m_nextpkt = NULL; 542 ln->la_hold = m0; 543 clear_llinfo_pqueue(ln); 544 } 545 EVENTHANDLER_INVOKE(lle_event, ln, LLENTRY_TIMEDOUT); 546 (void)nd6_free(ln, 0); 547 ln = NULL; 548 if (m != NULL) 549 icmp6_error2(m, ICMP6_DST_UNREACH, 550 ICMP6_DST_UNREACH_ADDR, 0, ifp); 551 } 552 break; 553 case ND6_LLINFO_REACHABLE: 554 if (!ND6_LLINFO_PERMANENT(ln)) { 555 ln->ln_state = ND6_LLINFO_STALE; 556 nd6_llinfo_settimer_locked(ln, (long)V_nd6_gctimer * hz); 557 } 558 break; 559 560 case ND6_LLINFO_STALE: 561 /* Garbage Collection(RFC 2461 5.3) */ 562 if (!ND6_LLINFO_PERMANENT(ln)) { 563 EVENTHANDLER_INVOKE(lle_event, ln, LLENTRY_EXPIRED); 564 (void)nd6_free(ln, 1); 565 ln = NULL; 566 } 567 break; 568 569 case ND6_LLINFO_DELAY: 570 if (ndi && (ndi->flags & ND6_IFF_PERFORMNUD) != 0) { 571 /* We need NUD */ 572 ln->la_asked = 1; 573 ln->ln_state = ND6_LLINFO_PROBE; 574 nd6_llinfo_settimer_locked(ln, (long)ndi->retrans * hz / 1000); 575 LLE_WUNLOCK(ln); 576 nd6_ns_output(ifp, dst, dst, ln, NULL); 577 LLE_WLOCK(ln); 578 } else { 579 ln->ln_state = ND6_LLINFO_STALE; /* XXX */ 580 nd6_llinfo_settimer_locked(ln, (long)V_nd6_gctimer * hz); 581 } 582 break; 583 case ND6_LLINFO_PROBE: 584 if (ln->la_asked < V_nd6_umaxtries) { 585 ln->la_asked++; 586 nd6_llinfo_settimer_locked(ln, (long)ndi->retrans * hz / 1000); 587 LLE_WUNLOCK(ln); 588 nd6_ns_output(ifp, dst, dst, ln, NULL); 589 LLE_WLOCK(ln); 590 } else { 591 EVENTHANDLER_INVOKE(lle_event, ln, LLENTRY_EXPIRED); 592 (void)nd6_free(ln, 0); 593 ln = NULL; 594 } 595 break; 596 default: 597 panic("%s: paths in a dark night can be confusing: %d", 598 __func__, ln->ln_state); 599 } 600done: 601 if (ln != NULL) 602 LLE_FREE_LOCKED(ln); 603 CURVNET_RESTORE(); 604} 605 606 607/* 608 * ND6 timer routine to expire default route list and prefix list 609 */ 610void 611nd6_timer(void *arg) 612{ 613 CURVNET_SET((struct vnet *) arg); 614 struct nd_defrouter *dr, *ndr; 615 struct nd_prefix *pr, *npr; 616 struct in6_ifaddr *ia6, *nia6; 617 618 callout_reset(&V_nd6_timer_ch, V_nd6_prune * hz, 619 nd6_timer, curvnet); 620 621 /* expire default router list */ 622 TAILQ_FOREACH_SAFE(dr, &V_nd_defrouter, dr_entry, ndr) { 623 if (dr->expire && dr->expire < time_uptime) 624 defrtrlist_del(dr); 625 } 626 627 /* 628 * expire interface addresses. 629 * in the past the loop was inside prefix expiry processing. 630 * However, from a stricter speci-confrmance standpoint, we should 631 * rather separate address lifetimes and prefix lifetimes. 632 * 633 * XXXRW: in6_ifaddrhead locking. 634 */ 635 addrloop: 636 TAILQ_FOREACH_SAFE(ia6, &V_in6_ifaddrhead, ia_link, nia6) { 637 /* check address lifetime */ 638 if (IFA6_IS_INVALID(ia6)) { 639 int regen = 0; 640 641 /* 642 * If the expiring address is temporary, try 643 * regenerating a new one. This would be useful when 644 * we suspended a laptop PC, then turned it on after a 645 * period that could invalidate all temporary 646 * addresses. Although we may have to restart the 647 * loop (see below), it must be after purging the 648 * address. Otherwise, we'd see an infinite loop of 649 * regeneration. 650 */ 651 if (V_ip6_use_tempaddr && 652 (ia6->ia6_flags & IN6_IFF_TEMPORARY) != 0) { 653 if (regen_tmpaddr(ia6) == 0) 654 regen = 1; 655 } 656 657 in6_purgeaddr(&ia6->ia_ifa); 658 659 if (regen) 660 goto addrloop; /* XXX: see below */ 661 } else if (IFA6_IS_DEPRECATED(ia6)) { 662 int oldflags = ia6->ia6_flags; 663 664 ia6->ia6_flags |= IN6_IFF_DEPRECATED; 665 666 /* 667 * If a temporary address has just become deprecated, 668 * regenerate a new one if possible. 669 */ 670 if (V_ip6_use_tempaddr && 671 (ia6->ia6_flags & IN6_IFF_TEMPORARY) != 0 && 672 (oldflags & IN6_IFF_DEPRECATED) == 0) { 673 674 if (regen_tmpaddr(ia6) == 0) { 675 /* 676 * A new temporary address is 677 * generated. 678 * XXX: this means the address chain 679 * has changed while we are still in 680 * the loop. Although the change 681 * would not cause disaster (because 682 * it's not a deletion, but an 683 * addition,) we'd rather restart the 684 * loop just for safety. Or does this 685 * significantly reduce performance?? 686 */ 687 goto addrloop; 688 } 689 } 690 } else { 691 /* 692 * A new RA might have made a deprecated address 693 * preferred. 694 */ 695 ia6->ia6_flags &= ~IN6_IFF_DEPRECATED; 696 } 697 } 698 699 /* expire prefix list */ 700 LIST_FOREACH_SAFE(pr, &V_nd_prefix, ndpr_entry, npr) { 701 /* 702 * check prefix lifetime. 703 * since pltime is just for autoconf, pltime processing for 704 * prefix is not necessary. 705 */ 706 if (pr->ndpr_vltime != ND6_INFINITE_LIFETIME && 707 time_uptime - pr->ndpr_lastupdate > pr->ndpr_vltime) { 708 709 /* 710 * address expiration and prefix expiration are 711 * separate. NEVER perform in6_purgeaddr here. 712 */ 713 prelist_remove(pr); 714 } 715 } 716 CURVNET_RESTORE(); 717} 718 719/* 720 * ia6 - deprecated/invalidated temporary address 721 */ 722static int 723regen_tmpaddr(struct in6_ifaddr *ia6) 724{ 725 struct ifaddr *ifa; 726 struct ifnet *ifp; 727 struct in6_ifaddr *public_ifa6 = NULL; 728 729 ifp = ia6->ia_ifa.ifa_ifp; 730 IF_ADDR_RLOCK(ifp); 731 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 732 struct in6_ifaddr *it6; 733 734 if (ifa->ifa_addr->sa_family != AF_INET6) 735 continue; 736 737 it6 = (struct in6_ifaddr *)ifa; 738 739 /* ignore no autoconf addresses. */ 740 if ((it6->ia6_flags & IN6_IFF_AUTOCONF) == 0) 741 continue; 742 743 /* ignore autoconf addresses with different prefixes. */ 744 if (it6->ia6_ndpr == NULL || it6->ia6_ndpr != ia6->ia6_ndpr) 745 continue; 746 747 /* 748 * Now we are looking at an autoconf address with the same 749 * prefix as ours. If the address is temporary and is still 750 * preferred, do not create another one. It would be rare, but 751 * could happen, for example, when we resume a laptop PC after 752 * a long period. 753 */ 754 if ((it6->ia6_flags & IN6_IFF_TEMPORARY) != 0 && 755 !IFA6_IS_DEPRECATED(it6)) { 756 public_ifa6 = NULL; 757 break; 758 } 759 760 /* 761 * This is a public autoconf address that has the same prefix 762 * as ours. If it is preferred, keep it. We can't break the 763 * loop here, because there may be a still-preferred temporary 764 * address with the prefix. 765 */ 766 if (!IFA6_IS_DEPRECATED(it6)) 767 public_ifa6 = it6; 768 } 769 if (public_ifa6 != NULL) 770 ifa_ref(&public_ifa6->ia_ifa); 771 IF_ADDR_RUNLOCK(ifp); 772 773 if (public_ifa6 != NULL) { 774 int e; 775 776 if ((e = in6_tmpifadd(public_ifa6, 0, 0)) != 0) { 777 ifa_free(&public_ifa6->ia_ifa); 778 log(LOG_NOTICE, "regen_tmpaddr: failed to create a new" 779 " tmp addr,errno=%d\n", e); 780 return (-1); 781 } 782 ifa_free(&public_ifa6->ia_ifa); 783 return (0); 784 } 785 786 return (-1); 787} 788 789/* 790 * Nuke neighbor cache/prefix/default router management table, right before 791 * ifp goes away. 792 */ 793void 794nd6_purge(struct ifnet *ifp) 795{ 796 struct nd_defrouter *dr, *ndr; 797 struct nd_prefix *pr, *npr; 798 799 /* 800 * Nuke default router list entries toward ifp. 801 * We defer removal of default router list entries that is installed 802 * in the routing table, in order to keep additional side effects as 803 * small as possible. 804 */ 805 TAILQ_FOREACH_SAFE(dr, &V_nd_defrouter, dr_entry, ndr) { 806 if (dr->installed) 807 continue; 808 809 if (dr->ifp == ifp) 810 defrtrlist_del(dr); 811 } 812 813 TAILQ_FOREACH_SAFE(dr, &V_nd_defrouter, dr_entry, ndr) { 814 if (!dr->installed) 815 continue; 816 817 if (dr->ifp == ifp) 818 defrtrlist_del(dr); 819 } 820 821 /* Nuke prefix list entries toward ifp */ 822 LIST_FOREACH_SAFE(pr, &V_nd_prefix, ndpr_entry, npr) { 823 if (pr->ndpr_ifp == ifp) { 824 /* 825 * Because if_detach() does *not* release prefixes 826 * while purging addresses the reference count will 827 * still be above zero. We therefore reset it to 828 * make sure that the prefix really gets purged. 829 */ 830 pr->ndpr_refcnt = 0; 831 832 /* 833 * Previously, pr->ndpr_addr is removed as well, 834 * but I strongly believe we don't have to do it. 835 * nd6_purge() is only called from in6_ifdetach(), 836 * which removes all the associated interface addresses 837 * by itself. 838 * (jinmei@kame.net 20010129) 839 */ 840 prelist_remove(pr); 841 } 842 } 843 844 /* cancel default outgoing interface setting */ 845 if (V_nd6_defifindex == ifp->if_index) 846 nd6_setdefaultiface(0); 847 848 if (ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV) { 849 /* Refresh default router list. */ 850 defrouter_select(); 851 } 852 853 /* XXXXX 854 * We do not nuke the neighbor cache entries here any more 855 * because the neighbor cache is kept in if_afdata[AF_INET6]. 856 * nd6_purge() is invoked by in6_ifdetach() which is called 857 * from if_detach() where everything gets purged. So let 858 * in6_domifdetach() do the actual L2 table purging work. 859 */ 860} 861 862/* 863 * the caller acquires and releases the lock on the lltbls 864 * Returns the llentry locked 865 */ 866struct llentry * 867nd6_lookup(struct in6_addr *addr6, int flags, struct ifnet *ifp) 868{ 869 struct sockaddr_in6 sin6; 870 struct llentry *ln; 871 int llflags; 872 873 bzero(&sin6, sizeof(sin6)); 874 sin6.sin6_len = sizeof(struct sockaddr_in6); 875 sin6.sin6_family = AF_INET6; 876 sin6.sin6_addr = *addr6; 877 878 IF_AFDATA_LOCK_ASSERT(ifp); 879 880 llflags = 0; 881 if (flags & ND6_CREATE) 882 llflags |= LLE_CREATE; 883 if (flags & ND6_EXCLUSIVE) 884 llflags |= LLE_EXCLUSIVE; 885 886 ln = lla_lookup(LLTABLE6(ifp), llflags, (struct sockaddr *)&sin6); 887 if ((ln != NULL) && (llflags & LLE_CREATE)) 888 ln->ln_state = ND6_LLINFO_NOSTATE; 889 890 return (ln); 891} 892 893/* 894 * Test whether a given IPv6 address is a neighbor or not, ignoring 895 * the actual neighbor cache. The neighbor cache is ignored in order 896 * to not reenter the routing code from within itself. 897 */ 898static int 899nd6_is_new_addr_neighbor(struct sockaddr_in6 *addr, struct ifnet *ifp) 900{ 901 struct nd_prefix *pr; 902 struct ifaddr *dstaddr; 903 904 /* 905 * A link-local address is always a neighbor. 906 * XXX: a link does not necessarily specify a single interface. 907 */ 908 if (IN6_IS_ADDR_LINKLOCAL(&addr->sin6_addr)) { 909 struct sockaddr_in6 sin6_copy; 910 u_int32_t zone; 911 912 /* 913 * We need sin6_copy since sa6_recoverscope() may modify the 914 * content (XXX). 915 */ 916 sin6_copy = *addr; 917 if (sa6_recoverscope(&sin6_copy)) 918 return (0); /* XXX: should be impossible */ 919 if (in6_setscope(&sin6_copy.sin6_addr, ifp, &zone)) 920 return (0); 921 if (sin6_copy.sin6_scope_id == zone) 922 return (1); 923 else 924 return (0); 925 } 926 927 /* 928 * If the address matches one of our addresses, 929 * it should be a neighbor. 930 * If the address matches one of our on-link prefixes, it should be a 931 * neighbor. 932 */ 933 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) { 934 if (pr->ndpr_ifp != ifp) 935 continue; 936 937 if (!(pr->ndpr_stateflags & NDPRF_ONLINK)) { 938 struct rtentry *rt; 939 940 /* Always use the default FIB here. */ 941 rt = in6_rtalloc1((struct sockaddr *)&pr->ndpr_prefix, 942 0, 0, RT_DEFAULT_FIB); 943 if (rt == NULL) 944 continue; 945 /* 946 * This is the case where multiple interfaces 947 * have the same prefix, but only one is installed 948 * into the routing table and that prefix entry 949 * is not the one being examined here. In the case 950 * where RADIX_MPATH is enabled, multiple route 951 * entries (of the same rt_key value) will be 952 * installed because the interface addresses all 953 * differ. 954 */ 955 if (!IN6_ARE_ADDR_EQUAL(&pr->ndpr_prefix.sin6_addr, 956 &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr)) { 957 RTFREE_LOCKED(rt); 958 continue; 959 } 960 RTFREE_LOCKED(rt); 961 } 962 963 if (IN6_ARE_MASKED_ADDR_EQUAL(&pr->ndpr_prefix.sin6_addr, 964 &addr->sin6_addr, &pr->ndpr_mask)) 965 return (1); 966 } 967 968 /* 969 * If the address is assigned on the node of the other side of 970 * a p2p interface, the address should be a neighbor. 971 */ 972 dstaddr = ifa_ifwithdstaddr((struct sockaddr *)addr); 973 if (dstaddr != NULL) { 974 if (dstaddr->ifa_ifp == ifp) { 975 ifa_free(dstaddr); 976 return (1); 977 } 978 ifa_free(dstaddr); 979 } 980 981 /* 982 * If the default router list is empty, all addresses are regarded 983 * as on-link, and thus, as a neighbor. 984 */ 985 if (ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV && 986 TAILQ_EMPTY(&V_nd_defrouter) && 987 V_nd6_defifindex == ifp->if_index) { 988 return (1); 989 } 990 991 return (0); 992} 993 994 995/* 996 * Detect if a given IPv6 address identifies a neighbor on a given link. 997 * XXX: should take care of the destination of a p2p link? 998 */ 999int 1000nd6_is_addr_neighbor(struct sockaddr_in6 *addr, struct ifnet *ifp) 1001{ 1002 struct llentry *lle; 1003 int rc = 0; 1004 1005 IF_AFDATA_UNLOCK_ASSERT(ifp); 1006 if (nd6_is_new_addr_neighbor(addr, ifp)) 1007 return (1); 1008 1009 /* 1010 * Even if the address matches none of our addresses, it might be 1011 * in the neighbor cache. 1012 */ 1013 IF_AFDATA_RLOCK(ifp); 1014 if ((lle = nd6_lookup(&addr->sin6_addr, 0, ifp)) != NULL) { 1015 LLE_RUNLOCK(lle); 1016 rc = 1; 1017 } 1018 IF_AFDATA_RUNLOCK(ifp); 1019 return (rc); 1020} 1021 1022/* 1023 * Free an nd6 llinfo entry. 1024 * Since the function would cause significant changes in the kernel, DO NOT 1025 * make it global, unless you have a strong reason for the change, and are sure 1026 * that the change is safe. 1027 */ 1028static struct llentry * 1029nd6_free(struct llentry *ln, int gc) 1030{ 1031 struct llentry *next; 1032 struct nd_defrouter *dr; 1033 struct ifnet *ifp; 1034 1035 LLE_WLOCK_ASSERT(ln); 1036 1037 /* 1038 * we used to have pfctlinput(PRC_HOSTDEAD) here. 1039 * even though it is not harmful, it was not really necessary. 1040 */ 1041 1042 /* cancel timer */ 1043 nd6_llinfo_settimer_locked(ln, -1); 1044 1045 ifp = ln->lle_tbl->llt_ifp; 1046 1047 if (ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV) { 1048 dr = defrouter_lookup(&L3_ADDR_SIN6(ln)->sin6_addr, ifp); 1049 1050 if (dr != NULL && dr->expire && 1051 ln->ln_state == ND6_LLINFO_STALE && gc) { 1052 /* 1053 * If the reason for the deletion is just garbage 1054 * collection, and the neighbor is an active default 1055 * router, do not delete it. Instead, reset the GC 1056 * timer using the router's lifetime. 1057 * Simply deleting the entry would affect default 1058 * router selection, which is not necessarily a good 1059 * thing, especially when we're using router preference 1060 * values. 1061 * XXX: the check for ln_state would be redundant, 1062 * but we intentionally keep it just in case. 1063 */ 1064 if (dr->expire > time_uptime) 1065 nd6_llinfo_settimer_locked(ln, 1066 (dr->expire - time_uptime) * hz); 1067 else 1068 nd6_llinfo_settimer_locked(ln, 1069 (long)V_nd6_gctimer * hz); 1070 1071 next = LIST_NEXT(ln, lle_next); 1072 LLE_REMREF(ln); 1073 LLE_WUNLOCK(ln); 1074 return (next); 1075 } 1076 1077 if (dr) { 1078 /* 1079 * Unreachablity of a router might affect the default 1080 * router selection and on-link detection of advertised 1081 * prefixes. 1082 */ 1083 1084 /* 1085 * Temporarily fake the state to choose a new default 1086 * router and to perform on-link determination of 1087 * prefixes correctly. 1088 * Below the state will be set correctly, 1089 * or the entry itself will be deleted. 1090 */ 1091 ln->ln_state = ND6_LLINFO_INCOMPLETE; 1092 } 1093 1094 if (ln->ln_router || dr) { 1095 1096 /* 1097 * We need to unlock to avoid a LOR with rt6_flush() with the 1098 * rnh and for the calls to pfxlist_onlink_check() and 1099 * defrouter_select() in the block further down for calls 1100 * into nd6_lookup(). We still hold a ref. 1101 */ 1102 LLE_WUNLOCK(ln); 1103 1104 /* 1105 * rt6_flush must be called whether or not the neighbor 1106 * is in the Default Router List. 1107 * See a corresponding comment in nd6_na_input(). 1108 */ 1109 rt6_flush(&L3_ADDR_SIN6(ln)->sin6_addr, ifp); 1110 } 1111 1112 if (dr) { 1113 /* 1114 * Since defrouter_select() does not affect the 1115 * on-link determination and MIP6 needs the check 1116 * before the default router selection, we perform 1117 * the check now. 1118 */ 1119 pfxlist_onlink_check(); 1120 1121 /* 1122 * Refresh default router list. 1123 */ 1124 defrouter_select(); 1125 } 1126 1127 if (ln->ln_router || dr) 1128 LLE_WLOCK(ln); 1129 } 1130 1131 /* 1132 * Before deleting the entry, remember the next entry as the 1133 * return value. We need this because pfxlist_onlink_check() above 1134 * might have freed other entries (particularly the old next entry) as 1135 * a side effect (XXX). 1136 */ 1137 next = LIST_NEXT(ln, lle_next); 1138 1139 /* 1140 * Save to unlock. We still hold an extra reference and will not 1141 * free(9) in llentry_free() if someone else holds one as well. 1142 */ 1143 LLE_WUNLOCK(ln); 1144 IF_AFDATA_LOCK(ifp); 1145 LLE_WLOCK(ln); 1146 1147 /* Guard against race with other llentry_free(). */ 1148 if (ln->la_flags & LLE_LINKED) { 1149 LLE_REMREF(ln); 1150 llentry_free(ln); 1151 } else 1152 LLE_FREE_LOCKED(ln); 1153 1154 IF_AFDATA_UNLOCK(ifp); 1155 1156 return (next); 1157} 1158 1159/* 1160 * Upper-layer reachability hint for Neighbor Unreachability Detection. 1161 * 1162 * XXX cost-effective methods? 1163 */ 1164void 1165nd6_nud_hint(struct rtentry *rt, struct in6_addr *dst6, int force) 1166{ 1167 struct llentry *ln; 1168 struct ifnet *ifp; 1169 1170 if ((dst6 == NULL) || (rt == NULL)) 1171 return; 1172 1173 ifp = rt->rt_ifp; 1174 IF_AFDATA_RLOCK(ifp); 1175 ln = nd6_lookup(dst6, ND6_EXCLUSIVE, NULL); 1176 IF_AFDATA_RUNLOCK(ifp); 1177 if (ln == NULL) 1178 return; 1179 1180 if (ln->ln_state < ND6_LLINFO_REACHABLE) 1181 goto done; 1182 1183 /* 1184 * if we get upper-layer reachability confirmation many times, 1185 * it is possible we have false information. 1186 */ 1187 if (!force) { 1188 ln->ln_byhint++; 1189 if (ln->ln_byhint > V_nd6_maxnudhint) { 1190 goto done; 1191 } 1192 } 1193 1194 ln->ln_state = ND6_LLINFO_REACHABLE; 1195 if (!ND6_LLINFO_PERMANENT(ln)) { 1196 nd6_llinfo_settimer_locked(ln, 1197 (long)ND_IFINFO(rt->rt_ifp)->reachable * hz); 1198 } 1199done: 1200 LLE_WUNLOCK(ln); 1201} 1202 1203 1204/* 1205 * Rejuvenate this function for routing operations related 1206 * processing. 1207 */ 1208void 1209nd6_rtrequest(int req, struct rtentry *rt, struct rt_addrinfo *info) 1210{ 1211 struct sockaddr_in6 *gateway; 1212 struct nd_defrouter *dr; 1213 struct ifnet *ifp; 1214 1215 RT_LOCK_ASSERT(rt); 1216 gateway = (struct sockaddr_in6 *)rt->rt_gateway; 1217 ifp = rt->rt_ifp; 1218 1219 switch (req) { 1220 case RTM_ADD: 1221 break; 1222 1223 case RTM_DELETE: 1224 if (!ifp) 1225 return; 1226 /* 1227 * Only indirect routes are interesting. 1228 */ 1229 if ((rt->rt_flags & RTF_GATEWAY) == 0) 1230 return; 1231 /* 1232 * check for default route 1233 */ 1234 if (IN6_ARE_ADDR_EQUAL(&in6addr_any, 1235 &SIN6(rt_key(rt))->sin6_addr)) { 1236 1237 dr = defrouter_lookup(&gateway->sin6_addr, ifp); 1238 if (dr != NULL) 1239 dr->installed = 0; 1240 } 1241 break; 1242 } 1243} 1244 1245 1246int 1247nd6_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp) 1248{ 1249 struct in6_ndireq *ndi = (struct in6_ndireq *)data; 1250 struct in6_nbrinfo *nbi = (struct in6_nbrinfo *)data; 1251 struct in6_ndifreq *ndif = (struct in6_ndifreq *)data; 1252 int error = 0; 1253 1254 if (ifp->if_afdata[AF_INET6] == NULL) 1255 return (EPFNOSUPPORT); 1256 switch (cmd) { 1257 case OSIOCGIFINFO_IN6: 1258#define ND ndi->ndi 1259 /* XXX: old ndp(8) assumes a positive value for linkmtu. */ 1260 bzero(&ND, sizeof(ND)); 1261 ND.linkmtu = IN6_LINKMTU(ifp); 1262 ND.maxmtu = ND_IFINFO(ifp)->maxmtu; 1263 ND.basereachable = ND_IFINFO(ifp)->basereachable; 1264 ND.reachable = ND_IFINFO(ifp)->reachable; 1265 ND.retrans = ND_IFINFO(ifp)->retrans; 1266 ND.flags = ND_IFINFO(ifp)->flags; 1267 ND.recalctm = ND_IFINFO(ifp)->recalctm; 1268 ND.chlim = ND_IFINFO(ifp)->chlim; 1269 break; 1270 case SIOCGIFINFO_IN6: 1271 ND = *ND_IFINFO(ifp); 1272 break; 1273 case SIOCSIFINFO_IN6: 1274 /* 1275 * used to change host variables from userland. 1276 * intented for a use on router to reflect RA configurations. 1277 */ 1278 /* 0 means 'unspecified' */ 1279 if (ND.linkmtu != 0) { 1280 if (ND.linkmtu < IPV6_MMTU || 1281 ND.linkmtu > IN6_LINKMTU(ifp)) { 1282 error = EINVAL; 1283 break; 1284 } 1285 ND_IFINFO(ifp)->linkmtu = ND.linkmtu; 1286 } 1287 1288 if (ND.basereachable != 0) { 1289 int obasereachable = ND_IFINFO(ifp)->basereachable; 1290 1291 ND_IFINFO(ifp)->basereachable = ND.basereachable; 1292 if (ND.basereachable != obasereachable) 1293 ND_IFINFO(ifp)->reachable = 1294 ND_COMPUTE_RTIME(ND.basereachable); 1295 } 1296 if (ND.retrans != 0) 1297 ND_IFINFO(ifp)->retrans = ND.retrans; 1298 if (ND.chlim != 0) 1299 ND_IFINFO(ifp)->chlim = ND.chlim; 1300 /* FALLTHROUGH */ 1301 case SIOCSIFINFO_FLAGS: 1302 { 1303 struct ifaddr *ifa; 1304 struct in6_ifaddr *ia; 1305 1306 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) && 1307 !(ND.flags & ND6_IFF_IFDISABLED)) { 1308 /* ifdisabled 1->0 transision */ 1309 1310 /* 1311 * If the interface is marked as ND6_IFF_IFDISABLED and 1312 * has an link-local address with IN6_IFF_DUPLICATED, 1313 * do not clear ND6_IFF_IFDISABLED. 1314 * See RFC 4862, Section 5.4.5. 1315 */ 1316 IF_ADDR_RLOCK(ifp); 1317 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1318 if (ifa->ifa_addr->sa_family != AF_INET6) 1319 continue; 1320 ia = (struct in6_ifaddr *)ifa; 1321 if ((ia->ia6_flags & IN6_IFF_DUPLICATED) && 1322 IN6_IS_ADDR_LINKLOCAL(IA6_IN6(ia))) 1323 break; 1324 } 1325 IF_ADDR_RUNLOCK(ifp); 1326 1327 if (ifa != NULL) { 1328 /* LLA is duplicated. */ 1329 ND.flags |= ND6_IFF_IFDISABLED; 1330 log(LOG_ERR, "Cannot enable an interface" 1331 " with a link-local address marked" 1332 " duplicate.\n"); 1333 } else { 1334 ND_IFINFO(ifp)->flags &= ~ND6_IFF_IFDISABLED; 1335 if (ifp->if_flags & IFF_UP) 1336 in6_if_up(ifp); 1337 } 1338 } else if (!(ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) && 1339 (ND.flags & ND6_IFF_IFDISABLED)) { 1340 /* ifdisabled 0->1 transision */ 1341 /* Mark all IPv6 address as tentative. */ 1342 1343 ND_IFINFO(ifp)->flags |= ND6_IFF_IFDISABLED; 1344 if ((ND_IFINFO(ifp)->flags & ND6_IFF_NO_DAD) == 0) { 1345 IF_ADDR_RLOCK(ifp); 1346 TAILQ_FOREACH(ifa, &ifp->if_addrhead, 1347 ifa_link) { 1348 if (ifa->ifa_addr->sa_family != 1349 AF_INET6) 1350 continue; 1351 ia = (struct in6_ifaddr *)ifa; 1352 ia->ia6_flags |= IN6_IFF_TENTATIVE; 1353 } 1354 IF_ADDR_RUNLOCK(ifp); 1355 } 1356 } 1357 1358 if (ND.flags & ND6_IFF_AUTO_LINKLOCAL) { 1359 if (!(ND_IFINFO(ifp)->flags & ND6_IFF_AUTO_LINKLOCAL)) { 1360 /* auto_linklocal 0->1 transision */ 1361 1362 /* If no link-local address on ifp, configure */ 1363 ND_IFINFO(ifp)->flags |= ND6_IFF_AUTO_LINKLOCAL; 1364 in6_ifattach(ifp, NULL); 1365 } else if (!(ND.flags & ND6_IFF_IFDISABLED) && 1366 ifp->if_flags & IFF_UP) { 1367 /* 1368 * When the IF already has 1369 * ND6_IFF_AUTO_LINKLOCAL, no link-local 1370 * address is assigned, and IFF_UP, try to 1371 * assign one. 1372 */ 1373 IF_ADDR_RLOCK(ifp); 1374 TAILQ_FOREACH(ifa, &ifp->if_addrhead, 1375 ifa_link) { 1376 if (ifa->ifa_addr->sa_family != 1377 AF_INET6) 1378 continue; 1379 ia = (struct in6_ifaddr *)ifa; 1380 if (IN6_IS_ADDR_LINKLOCAL(IA6_IN6(ia))) 1381 break; 1382 } 1383 IF_ADDR_RUNLOCK(ifp); 1384 if (ifa != NULL) 1385 /* No LLA is configured. */ 1386 in6_ifattach(ifp, NULL); 1387 } 1388 } 1389 } 1390 ND_IFINFO(ifp)->flags = ND.flags; 1391 break; 1392#undef ND 1393 case SIOCSNDFLUSH_IN6: /* XXX: the ioctl name is confusing... */ 1394 /* sync kernel routing table with the default router list */ 1395 defrouter_reset(); 1396 defrouter_select(); 1397 break; 1398 case SIOCSPFXFLUSH_IN6: 1399 { 1400 /* flush all the prefix advertised by routers */ 1401 struct nd_prefix *pr, *next; 1402 1403 LIST_FOREACH_SAFE(pr, &V_nd_prefix, ndpr_entry, next) { 1404 struct in6_ifaddr *ia, *ia_next; 1405 1406 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr)) 1407 continue; /* XXX */ 1408 1409 /* do we really have to remove addresses as well? */ 1410 /* XXXRW: in6_ifaddrhead locking. */ 1411 TAILQ_FOREACH_SAFE(ia, &V_in6_ifaddrhead, ia_link, 1412 ia_next) { 1413 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) == 0) 1414 continue; 1415 1416 if (ia->ia6_ndpr == pr) 1417 in6_purgeaddr(&ia->ia_ifa); 1418 } 1419 prelist_remove(pr); 1420 } 1421 break; 1422 } 1423 case SIOCSRTRFLUSH_IN6: 1424 { 1425 /* flush all the default routers */ 1426 struct nd_defrouter *dr, *next; 1427 1428 defrouter_reset(); 1429 TAILQ_FOREACH_SAFE(dr, &V_nd_defrouter, dr_entry, next) { 1430 defrtrlist_del(dr); 1431 } 1432 defrouter_select(); 1433 break; 1434 } 1435 case SIOCGNBRINFO_IN6: 1436 { 1437 struct llentry *ln; 1438 struct in6_addr nb_addr = nbi->addr; /* make local for safety */ 1439 1440 if ((error = in6_setscope(&nb_addr, ifp, NULL)) != 0) 1441 return (error); 1442 1443 IF_AFDATA_RLOCK(ifp); 1444 ln = nd6_lookup(&nb_addr, 0, ifp); 1445 IF_AFDATA_RUNLOCK(ifp); 1446 1447 if (ln == NULL) { 1448 error = EINVAL; 1449 break; 1450 } 1451 nbi->state = ln->ln_state; 1452 nbi->asked = ln->la_asked; 1453 nbi->isrouter = ln->ln_router; 1454 if (ln->la_expire == 0) 1455 nbi->expire = 0; 1456 else 1457 nbi->expire = ln->la_expire + 1458 (time_second - time_uptime); 1459 LLE_RUNLOCK(ln); 1460 break; 1461 } 1462 case SIOCGDEFIFACE_IN6: /* XXX: should be implemented as a sysctl? */ 1463 ndif->ifindex = V_nd6_defifindex; 1464 break; 1465 case SIOCSDEFIFACE_IN6: /* XXX: should be implemented as a sysctl? */ 1466 return (nd6_setdefaultiface(ndif->ifindex)); 1467 } 1468 return (error); 1469} 1470 1471/* 1472 * Create neighbor cache entry and cache link-layer address, 1473 * on reception of inbound ND6 packets. (RS/RA/NS/redirect) 1474 * 1475 * type - ICMP6 type 1476 * code - type dependent information 1477 * 1478 * XXXXX 1479 * The caller of this function already acquired the ndp 1480 * cache table lock because the cache entry is returned. 1481 */ 1482struct llentry * 1483nd6_cache_lladdr(struct ifnet *ifp, struct in6_addr *from, char *lladdr, 1484 int lladdrlen, int type, int code) 1485{ 1486 struct llentry *ln = NULL; 1487 int is_newentry; 1488 int do_update; 1489 int olladdr; 1490 int llchange; 1491 int flags; 1492 int newstate = 0; 1493 uint16_t router = 0; 1494 struct sockaddr_in6 sin6; 1495 struct mbuf *chain = NULL; 1496 int static_route = 0; 1497 1498 IF_AFDATA_UNLOCK_ASSERT(ifp); 1499 1500 KASSERT(ifp != NULL, ("%s: ifp == NULL", __func__)); 1501 KASSERT(from != NULL, ("%s: from == NULL", __func__)); 1502 1503 /* nothing must be updated for unspecified address */ 1504 if (IN6_IS_ADDR_UNSPECIFIED(from)) 1505 return NULL; 1506 1507 /* 1508 * Validation about ifp->if_addrlen and lladdrlen must be done in 1509 * the caller. 1510 * 1511 * XXX If the link does not have link-layer adderss, what should 1512 * we do? (ifp->if_addrlen == 0) 1513 * Spec says nothing in sections for RA, RS and NA. There's small 1514 * description on it in NS section (RFC 2461 7.2.3). 1515 */ 1516 flags = lladdr ? ND6_EXCLUSIVE : 0; 1517 IF_AFDATA_RLOCK(ifp); 1518 ln = nd6_lookup(from, flags, ifp); 1519 IF_AFDATA_RUNLOCK(ifp); 1520 if (ln == NULL) { 1521 flags |= ND6_EXCLUSIVE; 1522 IF_AFDATA_LOCK(ifp); 1523 ln = nd6_lookup(from, flags | ND6_CREATE, ifp); 1524 IF_AFDATA_UNLOCK(ifp); 1525 is_newentry = 1; 1526 } else { 1527 /* do nothing if static ndp is set */ 1528 if (ln->la_flags & LLE_STATIC) { 1529 static_route = 1; 1530 goto done; 1531 } 1532 is_newentry = 0; 1533 } 1534 if (ln == NULL) 1535 return (NULL); 1536 1537 olladdr = (ln->la_flags & LLE_VALID) ? 1 : 0; 1538 if (olladdr && lladdr) { 1539 llchange = bcmp(lladdr, &ln->ll_addr, 1540 ifp->if_addrlen); 1541 } else 1542 llchange = 0; 1543 1544 /* 1545 * newentry olladdr lladdr llchange (*=record) 1546 * 0 n n -- (1) 1547 * 0 y n -- (2) 1548 * 0 n y -- (3) * STALE 1549 * 0 y y n (4) * 1550 * 0 y y y (5) * STALE 1551 * 1 -- n -- (6) NOSTATE(= PASSIVE) 1552 * 1 -- y -- (7) * STALE 1553 */ 1554 1555 if (lladdr) { /* (3-5) and (7) */ 1556 /* 1557 * Record source link-layer address 1558 * XXX is it dependent to ifp->if_type? 1559 */ 1560 bcopy(lladdr, &ln->ll_addr, ifp->if_addrlen); 1561 ln->la_flags |= LLE_VALID; 1562 EVENTHANDLER_INVOKE(lle_event, ln, LLENTRY_RESOLVED); 1563 } 1564 1565 if (!is_newentry) { 1566 if ((!olladdr && lladdr != NULL) || /* (3) */ 1567 (olladdr && lladdr != NULL && llchange)) { /* (5) */ 1568 do_update = 1; 1569 newstate = ND6_LLINFO_STALE; 1570 } else /* (1-2,4) */ 1571 do_update = 0; 1572 } else { 1573 do_update = 1; 1574 if (lladdr == NULL) /* (6) */ 1575 newstate = ND6_LLINFO_NOSTATE; 1576 else /* (7) */ 1577 newstate = ND6_LLINFO_STALE; 1578 } 1579 1580 if (do_update) { 1581 /* 1582 * Update the state of the neighbor cache. 1583 */ 1584 ln->ln_state = newstate; 1585 1586 if (ln->ln_state == ND6_LLINFO_STALE) { 1587 if (ln->la_hold != NULL) 1588 nd6_grab_holdchain(ln, &chain, &sin6); 1589 } else if (ln->ln_state == ND6_LLINFO_INCOMPLETE) { 1590 /* probe right away */ 1591 nd6_llinfo_settimer_locked((void *)ln, 0); 1592 } 1593 } 1594 1595 /* 1596 * ICMP6 type dependent behavior. 1597 * 1598 * NS: clear IsRouter if new entry 1599 * RS: clear IsRouter 1600 * RA: set IsRouter if there's lladdr 1601 * redir: clear IsRouter if new entry 1602 * 1603 * RA case, (1): 1604 * The spec says that we must set IsRouter in the following cases: 1605 * - If lladdr exist, set IsRouter. This means (1-5). 1606 * - If it is old entry (!newentry), set IsRouter. This means (7). 1607 * So, based on the spec, in (1-5) and (7) cases we must set IsRouter. 1608 * A quetion arises for (1) case. (1) case has no lladdr in the 1609 * neighbor cache, this is similar to (6). 1610 * This case is rare but we figured that we MUST NOT set IsRouter. 1611 * 1612 * newentry olladdr lladdr llchange NS RS RA redir 1613 * D R 1614 * 0 n n -- (1) c ? s 1615 * 0 y n -- (2) c s s 1616 * 0 n y -- (3) c s s 1617 * 0 y y n (4) c s s 1618 * 0 y y y (5) c s s 1619 * 1 -- n -- (6) c c c s 1620 * 1 -- y -- (7) c c s c s 1621 * 1622 * (c=clear s=set) 1623 */ 1624 switch (type & 0xff) { 1625 case ND_NEIGHBOR_SOLICIT: 1626 /* 1627 * New entry must have is_router flag cleared. 1628 */ 1629 if (is_newentry) /* (6-7) */ 1630 ln->ln_router = 0; 1631 break; 1632 case ND_REDIRECT: 1633 /* 1634 * If the icmp is a redirect to a better router, always set the 1635 * is_router flag. Otherwise, if the entry is newly created, 1636 * clear the flag. [RFC 2461, sec 8.3] 1637 */ 1638 if (code == ND_REDIRECT_ROUTER) 1639 ln->ln_router = 1; 1640 else if (is_newentry) /* (6-7) */ 1641 ln->ln_router = 0; 1642 break; 1643 case ND_ROUTER_SOLICIT: 1644 /* 1645 * is_router flag must always be cleared. 1646 */ 1647 ln->ln_router = 0; 1648 break; 1649 case ND_ROUTER_ADVERT: 1650 /* 1651 * Mark an entry with lladdr as a router. 1652 */ 1653 if ((!is_newentry && (olladdr || lladdr)) || /* (2-5) */ 1654 (is_newentry && lladdr)) { /* (7) */ 1655 ln->ln_router = 1; 1656 } 1657 break; 1658 } 1659 1660 if (ln != NULL) { 1661 static_route = (ln->la_flags & LLE_STATIC); 1662 router = ln->ln_router; 1663 1664 if (flags & ND6_EXCLUSIVE) 1665 LLE_WUNLOCK(ln); 1666 else 1667 LLE_RUNLOCK(ln); 1668 if (static_route) 1669 ln = NULL; 1670 } 1671 if (chain != NULL) 1672 nd6_flush_holdchain(ifp, ifp, chain, &sin6); 1673 1674 /* 1675 * When the link-layer address of a router changes, select the 1676 * best router again. In particular, when the neighbor entry is newly 1677 * created, it might affect the selection policy. 1678 * Question: can we restrict the first condition to the "is_newentry" 1679 * case? 1680 * XXX: when we hear an RA from a new router with the link-layer 1681 * address option, defrouter_select() is called twice, since 1682 * defrtrlist_update called the function as well. However, I believe 1683 * we can compromise the overhead, since it only happens the first 1684 * time. 1685 * XXX: although defrouter_select() should not have a bad effect 1686 * for those are not autoconfigured hosts, we explicitly avoid such 1687 * cases for safety. 1688 */ 1689 if (do_update && router && 1690 ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV) { 1691 /* 1692 * guaranteed recursion 1693 */ 1694 defrouter_select(); 1695 } 1696 1697 return (ln); 1698done: 1699 if (ln != NULL) { 1700 if (flags & ND6_EXCLUSIVE) 1701 LLE_WUNLOCK(ln); 1702 else 1703 LLE_RUNLOCK(ln); 1704 if (static_route) 1705 ln = NULL; 1706 } 1707 return (ln); 1708} 1709 1710static void 1711nd6_slowtimo(void *arg) 1712{ 1713 CURVNET_SET((struct vnet *) arg); 1714 struct nd_ifinfo *nd6if; 1715 struct ifnet *ifp; 1716 1717 callout_reset(&V_nd6_slowtimo_ch, ND6_SLOWTIMER_INTERVAL * hz, 1718 nd6_slowtimo, curvnet); 1719 IFNET_RLOCK_NOSLEEP(); 1720 TAILQ_FOREACH(ifp, &V_ifnet, if_list) { 1721 if (ifp->if_afdata[AF_INET6] == NULL) 1722 continue; 1723 nd6if = ND_IFINFO(ifp); 1724 if (nd6if->basereachable && /* already initialized */ 1725 (nd6if->recalctm -= ND6_SLOWTIMER_INTERVAL) <= 0) { 1726 /* 1727 * Since reachable time rarely changes by router 1728 * advertisements, we SHOULD insure that a new random 1729 * value gets recomputed at least once every few hours. 1730 * (RFC 2461, 6.3.4) 1731 */ 1732 nd6if->recalctm = V_nd6_recalc_reachtm_interval; 1733 nd6if->reachable = ND_COMPUTE_RTIME(nd6if->basereachable); 1734 } 1735 } 1736 IFNET_RUNLOCK_NOSLEEP(); 1737 CURVNET_RESTORE(); 1738} 1739 1740void 1741nd6_grab_holdchain(struct llentry *ln, struct mbuf **chain, 1742 struct sockaddr_in6 *sin6) 1743{ 1744 1745 LLE_WLOCK_ASSERT(ln); 1746 1747 *chain = ln->la_hold; 1748 ln->la_hold = NULL; 1749 memcpy(sin6, L3_ADDR_SIN6(ln), sizeof(*sin6)); 1750 1751 if (ln->ln_state == ND6_LLINFO_STALE) { 1752 1753 /* 1754 * The first time we send a packet to a 1755 * neighbor whose entry is STALE, we have 1756 * to change the state to DELAY and a sets 1757 * a timer to expire in DELAY_FIRST_PROBE_TIME 1758 * seconds to ensure do neighbor unreachability 1759 * detection on expiration. 1760 * (RFC 2461 7.3.3) 1761 */ 1762 ln->la_asked = 0; 1763 ln->ln_state = ND6_LLINFO_DELAY; 1764 nd6_llinfo_settimer_locked(ln, (long)V_nd6_delay * hz); 1765 } 1766} 1767 1768static int 1769nd6_output_ifp(struct ifnet *ifp, struct ifnet *origifp, struct mbuf *m, 1770 struct sockaddr_in6 *dst) 1771{ 1772 int error; 1773 int ip6len; 1774 struct ip6_hdr *ip6; 1775 struct m_tag *mtag; 1776 1777#ifdef MAC 1778 mac_netinet6_nd6_send(ifp, m); 1779#endif 1780 1781 /* 1782 * If called from nd6_ns_output() (NS), nd6_na_output() (NA), 1783 * icmp6_redirect_output() (REDIRECT) or from rip6_output() (RS, RA 1784 * as handled by rtsol and rtadvd), mbufs will be tagged for SeND 1785 * to be diverted to user space. When re-injected into the kernel, 1786 * send_output() will directly dispatch them to the outgoing interface. 1787 */ 1788 if (send_sendso_input_hook != NULL) { 1789 mtag = m_tag_find(m, PACKET_TAG_ND_OUTGOING, NULL); 1790 if (mtag != NULL) { 1791 ip6 = mtod(m, struct ip6_hdr *); 1792 ip6len = sizeof(struct ip6_hdr) + ntohs(ip6->ip6_plen); 1793 /* Use the SEND socket */ 1794 error = send_sendso_input_hook(m, ifp, SND_OUT, 1795 ip6len); 1796 /* -1 == no app on SEND socket */ 1797 if (error == 0 || error != -1) 1798 return (error); 1799 } 1800 } 1801 1802 m_clrprotoflags(m); /* Avoid confusing lower layers. */ 1803 IP_PROBE(send, NULL, NULL, mtod(m, struct ip6_hdr *), ifp, NULL, 1804 mtod(m, struct ip6_hdr *)); 1805 1806 if ((ifp->if_flags & IFF_LOOPBACK) == 0) 1807 origifp = ifp; 1808 1809 error = (*ifp->if_output)(origifp, m, (struct sockaddr *)dst, NULL); 1810 return (error); 1811} 1812 1813/* 1814 * IPv6 packet output - light version. 1815 * Checks if destination LLE exists and is in proper state 1816 * (e.g no modification required). If not true, fall back to 1817 * "heavy" version. 1818 */ 1819int 1820nd6_output(struct ifnet *ifp, struct ifnet *origifp, struct mbuf *m, 1821 struct sockaddr_in6 *dst, struct rtentry *rt0) 1822{ 1823 struct llentry *ln = NULL; 1824 1825 /* discard the packet if IPv6 operation is disabled on the interface */ 1826 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)) { 1827 m_freem(m); 1828 return (ENETDOWN); /* better error? */ 1829 } 1830 1831 if (IN6_IS_ADDR_MULTICAST(&dst->sin6_addr)) 1832 goto sendpkt; 1833 1834 if (nd6_need_cache(ifp) == 0) 1835 goto sendpkt; 1836 1837 IF_AFDATA_RLOCK(ifp); 1838 ln = nd6_lookup(&dst->sin6_addr, 0, ifp); 1839 IF_AFDATA_RUNLOCK(ifp); 1840 1841 /* 1842 * Perform fast path for the following cases: 1843 * 1) lle state is REACHABLE 1844 * 2) lle state is DELAY (NS message sentNS message sent) 1845 * 1846 * Every other case involves lle modification, so we handle 1847 * them separately. 1848 */ 1849 if (ln == NULL || (ln->ln_state != ND6_LLINFO_REACHABLE && 1850 ln->ln_state != ND6_LLINFO_DELAY)) { 1851 /* Fall back to slow processing path */ 1852 if (ln != NULL) 1853 LLE_RUNLOCK(ln); 1854 return (nd6_output_lle(ifp, origifp, m, dst)); 1855 } 1856 1857sendpkt: 1858 if (ln != NULL) 1859 LLE_RUNLOCK(ln); 1860 1861 return (nd6_output_ifp(ifp, origifp, m, dst)); 1862} 1863 1864 1865/* 1866 * Output IPv6 packet - heavy version. 1867 * Function assume that either 1868 * 1) destination LLE does not exist, is invalid or stale, so 1869 * ND6_EXCLUSIVE lock needs to be acquired 1870 * 2) destination lle is provided (with ND6_EXCLUSIVE lock), 1871 * in that case packets are queued in &chain. 1872 * 1873 */ 1874static int 1875nd6_output_lle(struct ifnet *ifp, struct ifnet *origifp, struct mbuf *m, 1876 struct sockaddr_in6 *dst) 1877{ 1878 struct llentry *lle = NULL; 1879 int flags = 0; 1880 1881 KASSERT(m != NULL, ("NULL mbuf, nothing to send")); 1882 /* discard the packet if IPv6 operation is disabled on the interface */ 1883 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)) { 1884 m_freem(m); 1885 return (ENETDOWN); /* better error? */ 1886 } 1887 1888 if (IN6_IS_ADDR_MULTICAST(&dst->sin6_addr)) 1889 goto sendpkt; 1890 1891 if (nd6_need_cache(ifp) == 0) 1892 goto sendpkt; 1893 1894 /* 1895 * Address resolution or Neighbor Unreachability Detection 1896 * for the next hop. 1897 * At this point, the destination of the packet must be a unicast 1898 * or an anycast address(i.e. not a multicast). 1899 */ 1900 if (lle == NULL) { 1901 IF_AFDATA_RLOCK(ifp); 1902 lle = nd6_lookup(&dst->sin6_addr, ND6_EXCLUSIVE, ifp); 1903 IF_AFDATA_RUNLOCK(ifp); 1904 if ((lle == NULL) && nd6_is_addr_neighbor(dst, ifp)) { 1905 /* 1906 * Since nd6_is_addr_neighbor() internally calls nd6_lookup(), 1907 * the condition below is not very efficient. But we believe 1908 * it is tolerable, because this should be a rare case. 1909 */ 1910 flags = ND6_CREATE | ND6_EXCLUSIVE; 1911 IF_AFDATA_LOCK(ifp); 1912 lle = nd6_lookup(&dst->sin6_addr, flags, ifp); 1913 IF_AFDATA_UNLOCK(ifp); 1914 } 1915 } 1916 if (lle == NULL) { 1917 if ((ifp->if_flags & IFF_POINTOPOINT) == 0 && 1918 !(ND_IFINFO(ifp)->flags & ND6_IFF_PERFORMNUD)) { 1919 char ip6buf[INET6_ADDRSTRLEN]; 1920 log(LOG_DEBUG, 1921 "nd6_output: can't allocate llinfo for %s " 1922 "(ln=%p)\n", 1923 ip6_sprintf(ip6buf, &dst->sin6_addr), lle); 1924 m_freem(m); 1925 return (ENOBUFS); 1926 } 1927 goto sendpkt; /* send anyway */ 1928 } 1929 1930 LLE_WLOCK_ASSERT(lle); 1931 1932 /* We don't have to do link-layer address resolution on a p2p link. */ 1933 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 && 1934 lle->ln_state < ND6_LLINFO_REACHABLE) { 1935 lle->ln_state = ND6_LLINFO_STALE; 1936 nd6_llinfo_settimer_locked(lle, (long)V_nd6_gctimer * hz); 1937 } 1938 1939 /* 1940 * The first time we send a packet to a neighbor whose entry is 1941 * STALE, we have to change the state to DELAY and a sets a timer to 1942 * expire in DELAY_FIRST_PROBE_TIME seconds to ensure do 1943 * neighbor unreachability detection on expiration. 1944 * (RFC 2461 7.3.3) 1945 */ 1946 if (lle->ln_state == ND6_LLINFO_STALE) { 1947 lle->la_asked = 0; 1948 lle->ln_state = ND6_LLINFO_DELAY; 1949 nd6_llinfo_settimer_locked(lle, (long)V_nd6_delay * hz); 1950 } 1951 1952 /* 1953 * If the neighbor cache entry has a state other than INCOMPLETE 1954 * (i.e. its link-layer address is already resolved), just 1955 * send the packet. 1956 */ 1957 if (lle->ln_state > ND6_LLINFO_INCOMPLETE) 1958 goto sendpkt; 1959 1960 /* 1961 * There is a neighbor cache entry, but no ethernet address 1962 * response yet. Append this latest packet to the end of the 1963 * packet queue in the mbuf, unless the number of the packet 1964 * does not exceed nd6_maxqueuelen. When it exceeds nd6_maxqueuelen, 1965 * the oldest packet in the queue will be removed. 1966 */ 1967 if (lle->ln_state == ND6_LLINFO_NOSTATE) 1968 lle->ln_state = ND6_LLINFO_INCOMPLETE; 1969 1970 if (lle->la_hold != NULL) { 1971 struct mbuf *m_hold; 1972 int i; 1973 1974 i = 0; 1975 for (m_hold = lle->la_hold; m_hold; m_hold = m_hold->m_nextpkt){ 1976 i++; 1977 if (m_hold->m_nextpkt == NULL) { 1978 m_hold->m_nextpkt = m; 1979 break; 1980 } 1981 } 1982 while (i >= V_nd6_maxqueuelen) { 1983 m_hold = lle->la_hold; 1984 lle->la_hold = lle->la_hold->m_nextpkt; 1985 m_freem(m_hold); 1986 i--; 1987 } 1988 } else { 1989 lle->la_hold = m; 1990 } 1991 1992 /* 1993 * If there has been no NS for the neighbor after entering the 1994 * INCOMPLETE state, send the first solicitation. 1995 */ 1996 if (!ND6_LLINFO_PERMANENT(lle) && lle->la_asked == 0) { 1997 lle->la_asked++; 1998 1999 nd6_llinfo_settimer_locked(lle, 2000 (long)ND_IFINFO(ifp)->retrans * hz / 1000); 2001 LLE_WUNLOCK(lle); 2002 nd6_ns_output(ifp, NULL, &dst->sin6_addr, lle, NULL); 2003 } else { 2004 /* We did the lookup so we need to do the unlock here. */ 2005 LLE_WUNLOCK(lle); 2006 } 2007 2008 return (0); 2009 2010 sendpkt: 2011 if (lle != NULL) 2012 LLE_WUNLOCK(lle); 2013 2014 return (nd6_output_ifp(ifp, origifp, m, dst)); 2015} 2016 2017 2018int 2019nd6_flush_holdchain(struct ifnet *ifp, struct ifnet *origifp, struct mbuf *chain, 2020 struct sockaddr_in6 *dst) 2021{ 2022 struct mbuf *m, *m_head; 2023 struct ifnet *outifp; 2024 int error = 0; 2025 2026 m_head = chain; 2027 if ((ifp->if_flags & IFF_LOOPBACK) != 0) 2028 outifp = origifp; 2029 else 2030 outifp = ifp; 2031 2032 while (m_head) { 2033 m = m_head; 2034 m_head = m_head->m_nextpkt; 2035 error = nd6_output_ifp(ifp, origifp, m, dst); 2036 } 2037 2038 /* 2039 * XXX 2040 * note that intermediate errors are blindly ignored - but this is 2041 * the same convention as used with nd6_output when called by 2042 * nd6_cache_lladdr 2043 */ 2044 return (error); 2045} 2046 2047 2048int 2049nd6_need_cache(struct ifnet *ifp) 2050{ 2051 /* 2052 * XXX: we currently do not make neighbor cache on any interface 2053 * other than ARCnet, Ethernet, FDDI and GIF. 2054 * 2055 * RFC2893 says: 2056 * - unidirectional tunnels needs no ND 2057 */ 2058 switch (ifp->if_type) { 2059 case IFT_ARCNET: 2060 case IFT_ETHER: 2061 case IFT_FDDI: 2062 case IFT_IEEE1394: 2063#ifdef IFT_L2VLAN 2064 case IFT_L2VLAN: 2065#endif 2066#ifdef IFT_IEEE80211 2067 case IFT_IEEE80211: 2068#endif 2069 case IFT_INFINIBAND: 2070 case IFT_BRIDGE: 2071 case IFT_PROPVIRTUAL: 2072 return (1); 2073 default: 2074 return (0); 2075 } 2076} 2077 2078/* 2079 * the callers of this function need to be re-worked to drop 2080 * the lle lock, drop here for now 2081 */ 2082int 2083nd6_storelladdr(struct ifnet *ifp, struct mbuf *m, 2084 const struct sockaddr *dst, u_char *desten, struct llentry **lle) 2085{ 2086 struct llentry *ln; 2087 2088 *lle = NULL; 2089 IF_AFDATA_UNLOCK_ASSERT(ifp); 2090 if (m != NULL && m->m_flags & M_MCAST) { 2091 int i; 2092 2093 switch (ifp->if_type) { 2094 case IFT_ETHER: 2095 case IFT_FDDI: 2096#ifdef IFT_L2VLAN 2097 case IFT_L2VLAN: 2098#endif 2099#ifdef IFT_IEEE80211 2100 case IFT_IEEE80211: 2101#endif 2102 case IFT_BRIDGE: 2103 case IFT_ISO88025: 2104 ETHER_MAP_IPV6_MULTICAST(&SIN6(dst)->sin6_addr, 2105 desten); 2106 return (0); 2107 case IFT_IEEE1394: 2108 /* 2109 * netbsd can use if_broadcastaddr, but we don't do so 2110 * to reduce # of ifdef. 2111 */ 2112 for (i = 0; i < ifp->if_addrlen; i++) 2113 desten[i] = ~0; 2114 return (0); 2115 case IFT_ARCNET: 2116 *desten = 0; 2117 return (0); 2118 default: 2119 m_freem(m); 2120 return (EAFNOSUPPORT); 2121 } 2122 } 2123 2124 2125 /* 2126 * the entry should have been created in nd6_store_lladdr 2127 */ 2128 IF_AFDATA_RLOCK(ifp); 2129 ln = lla_lookup(LLTABLE6(ifp), 0, dst); 2130 IF_AFDATA_RUNLOCK(ifp); 2131 if ((ln == NULL) || !(ln->la_flags & LLE_VALID)) { 2132 if (ln != NULL) 2133 LLE_RUNLOCK(ln); 2134 /* this could happen, if we could not allocate memory */ 2135 m_freem(m); 2136 return (1); 2137 } 2138 2139 bcopy(&ln->ll_addr, desten, ifp->if_addrlen); 2140 *lle = ln; 2141 LLE_RUNLOCK(ln); 2142 /* 2143 * A *small* use after free race exists here 2144 */ 2145 return (0); 2146} 2147 2148static void 2149clear_llinfo_pqueue(struct llentry *ln) 2150{ 2151 struct mbuf *m_hold, *m_hold_next; 2152 2153 for (m_hold = ln->la_hold; m_hold; m_hold = m_hold_next) { 2154 m_hold_next = m_hold->m_nextpkt; 2155 m_freem(m_hold); 2156 } 2157 2158 ln->la_hold = NULL; 2159 return; 2160} 2161 2162static int nd6_sysctl_drlist(SYSCTL_HANDLER_ARGS); 2163static int nd6_sysctl_prlist(SYSCTL_HANDLER_ARGS); 2164#ifdef SYSCTL_DECL 2165SYSCTL_DECL(_net_inet6_icmp6); 2166#endif 2167SYSCTL_NODE(_net_inet6_icmp6, ICMPV6CTL_ND6_DRLIST, nd6_drlist, 2168 CTLFLAG_RD, nd6_sysctl_drlist, ""); 2169SYSCTL_NODE(_net_inet6_icmp6, ICMPV6CTL_ND6_PRLIST, nd6_prlist, 2170 CTLFLAG_RD, nd6_sysctl_prlist, ""); 2171SYSCTL_VNET_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_MAXQLEN, nd6_maxqueuelen, 2172 CTLFLAG_RW, &VNET_NAME(nd6_maxqueuelen), 1, ""); 2173SYSCTL_VNET_INT(_net_inet6_icmp6, OID_AUTO, nd6_gctimer, 2174 CTLFLAG_RW, &VNET_NAME(nd6_gctimer), (60 * 60 * 24), ""); 2175 2176static int 2177nd6_sysctl_drlist(SYSCTL_HANDLER_ARGS) 2178{ 2179 struct in6_defrouter d; 2180 struct nd_defrouter *dr; 2181 int error; 2182 2183 if (req->newptr) 2184 return (EPERM); 2185 2186 bzero(&d, sizeof(d)); 2187 d.rtaddr.sin6_family = AF_INET6; 2188 d.rtaddr.sin6_len = sizeof(d.rtaddr); 2189 2190 /* 2191 * XXX locking 2192 */ 2193 TAILQ_FOREACH(dr, &V_nd_defrouter, dr_entry) { 2194 d.rtaddr.sin6_addr = dr->rtaddr; 2195 error = sa6_recoverscope(&d.rtaddr); 2196 if (error != 0) 2197 return (error); 2198 d.flags = dr->flags; 2199 d.rtlifetime = dr->rtlifetime; 2200 d.expire = dr->expire + (time_second - time_uptime); 2201 d.if_index = dr->ifp->if_index; 2202 error = SYSCTL_OUT(req, &d, sizeof(d)); 2203 if (error != 0) 2204 return (error); 2205 } 2206 return (0); 2207} 2208 2209static int 2210nd6_sysctl_prlist(SYSCTL_HANDLER_ARGS) 2211{ 2212 struct in6_prefix p; 2213 struct sockaddr_in6 s6; 2214 struct nd_prefix *pr; 2215 struct nd_pfxrouter *pfr; 2216 time_t maxexpire; 2217 int error; 2218 char ip6buf[INET6_ADDRSTRLEN]; 2219 2220 if (req->newptr) 2221 return (EPERM); 2222 2223 bzero(&p, sizeof(p)); 2224 p.origin = PR_ORIG_RA; 2225 bzero(&s6, sizeof(s6)); 2226 s6.sin6_family = AF_INET6; 2227 s6.sin6_len = sizeof(s6); 2228 2229 /* 2230 * XXX locking 2231 */ 2232 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) { 2233 p.prefix = pr->ndpr_prefix; 2234 if (sa6_recoverscope(&p.prefix)) { 2235 log(LOG_ERR, "scope error in prefix list (%s)\n", 2236 ip6_sprintf(ip6buf, &p.prefix.sin6_addr)); 2237 /* XXX: press on... */ 2238 } 2239 p.raflags = pr->ndpr_raf; 2240 p.prefixlen = pr->ndpr_plen; 2241 p.vltime = pr->ndpr_vltime; 2242 p.pltime = pr->ndpr_pltime; 2243 p.if_index = pr->ndpr_ifp->if_index; 2244 if (pr->ndpr_vltime == ND6_INFINITE_LIFETIME) 2245 p.expire = 0; 2246 else { 2247 /* XXX: we assume time_t is signed. */ 2248 maxexpire = (-1) & 2249 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1)); 2250 if (pr->ndpr_vltime < maxexpire - pr->ndpr_lastupdate) 2251 p.expire = pr->ndpr_lastupdate + 2252 pr->ndpr_vltime + 2253 (time_second - time_uptime); 2254 else 2255 p.expire = maxexpire; 2256 } 2257 p.refcnt = pr->ndpr_refcnt; 2258 p.flags = pr->ndpr_stateflags; 2259 p.advrtrs = 0; 2260 LIST_FOREACH(pfr, &pr->ndpr_advrtrs, pfr_entry) 2261 p.advrtrs++; 2262 error = SYSCTL_OUT(req, &p, sizeof(p)); 2263 if (error != 0) 2264 return (error); 2265 LIST_FOREACH(pfr, &pr->ndpr_advrtrs, pfr_entry) { 2266 s6.sin6_addr = pfr->router->rtaddr; 2267 if (sa6_recoverscope(&s6)) 2268 log(LOG_ERR, 2269 "scope error in prefix list (%s)\n", 2270 ip6_sprintf(ip6buf, &pfr->router->rtaddr)); 2271 error = SYSCTL_OUT(req, &s6, sizeof(s6)); 2272 if (error != 0) 2273 return (error); 2274 } 2275 } 2276 return (0); 2277} 2278