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 "opt_inet.h" 35 #include "opt_inet6.h" 36 #include "opt_route.h" 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/eventhandler.h> 41 #include <sys/callout.h> 42 #include <sys/lock.h> 43 #include <sys/malloc.h> 44 #include <sys/mbuf.h> 45 #include <sys/mutex.h> 46 #include <sys/socket.h> 47 #include <sys/sockio.h> 48 #include <sys/time.h> 49 #include <sys/kernel.h> 50 #include <sys/protosw.h> 51 #include <sys/errno.h> 52 #include <sys/syslog.h> 53 #include <sys/rwlock.h> 54 #include <sys/queue.h> 55 #include <sys/sdt.h> 56 #include <sys/sysctl.h> 57 58 #include <net/if.h> 59 #include <net/if_var.h> 60 #include <net/if_dl.h> 61 #include <net/if_private.h> 62 #include <net/if_types.h> 63 #include <net/route.h> 64 #include <net/route/route_ctl.h> 65 #include <net/route/nhop.h> 66 #include <net/vnet.h> 67 68 #include <netinet/in.h> 69 #include <netinet/in_kdtrace.h> 70 #include <net/if_llatbl.h> 71 #include <netinet/if_ether.h> 72 #include <netinet6/in6_fib.h> 73 #include <netinet6/in6_var.h> 74 #include <netinet/ip6.h> 75 #include <netinet6/ip6_var.h> 76 #include <netinet6/scope6_var.h> 77 #include <netinet6/nd6.h> 78 #include <netinet6/in6_ifattach.h> 79 #include <netinet/icmp6.h> 80 #include <netinet6/send.h> 81 82 #include <sys/limits.h> 83 84 #include <security/mac/mac_framework.h> 85 86 #define ND6_PREFIX_WITH_ROUTER(pr) !LIST_EMPTY(&(pr)->ndpr_advrtrs) 87 88 #define ND6_SLOWTIMER_INTERVAL (60 * 60) /* 1 hour */ 89 #define ND6_RECALC_REACHTM_INTERVAL (60 * 120) /* 2 hours */ 90 91 VNET_DEFINE_STATIC(int, nd6_prune) = 1; 92 #define V_nd6_prune VNET(nd6_prune) 93 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_PRUNE, nd6_prune, 94 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_prune), 0, 95 "Frequency in seconds of checks for expired prefixes and routers"); 96 97 VNET_DEFINE_STATIC(int, nd6_delay) = 5; 98 #define V_nd6_delay VNET(nd6_delay) 99 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_DELAY, nd6_delay, 100 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_delay), 0, 101 "Delay in seconds before probing for reachability"); 102 103 VNET_DEFINE_STATIC(int, nd6_umaxtries) = 3; 104 #define V_nd6_umaxtries VNET(nd6_umaxtries) 105 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_UMAXTRIES, nd6_umaxtries, 106 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_umaxtries), 0, 107 "Number of ICMPv6 NS messages sent during reachability detection"); 108 109 VNET_DEFINE(int, nd6_mmaxtries) = 3; 110 #define V_nd6_mmaxtries VNET(nd6_mmaxtries) 111 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_MMAXTRIES, nd6_mmaxtries, 112 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_mmaxtries), 0, 113 "Number of ICMPv6 NS messages sent during address resolution"); 114 115 VNET_DEFINE_STATIC(int, nd6_gctimer) = (60 * 60 * 24); /* 1 day: garbage 116 * collection timer */ 117 #define V_nd6_gctimer VNET(nd6_gctimer) 118 119 /* preventing too many loops in ND option parsing */ 120 VNET_DEFINE_STATIC(int, nd6_maxndopt) = 10; /* max # of ND options allowed */ 121 122 VNET_DEFINE_STATIC(int, nd6_maxqueuelen) = 16; /* max pkts cached in unresolved 123 * ND entries */ 124 #define V_nd6_maxndopt VNET(nd6_maxndopt) 125 #define V_nd6_maxqueuelen VNET(nd6_maxqueuelen) 126 127 #ifdef ND6_DEBUG 128 VNET_DEFINE(int, nd6_debug) = 1; 129 #else 130 VNET_DEFINE(int, nd6_debug) = 0; 131 #endif 132 #define V_nd6_debug VNET(nd6_debug) 133 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_DEBUG, nd6_debug, 134 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_debug), 0, 135 "Log NDP debug messages"); 136 137 static eventhandler_tag lle_event_eh, iflladdr_event_eh, ifnet_link_event_eh; 138 139 VNET_DEFINE(struct nd_prhead, nd_prefix); 140 VNET_DEFINE(struct rwlock, nd6_lock); 141 VNET_DEFINE(uint64_t, nd6_list_genid); 142 VNET_DEFINE(struct mtx, nd6_onlink_mtx); 143 144 VNET_DEFINE(int, nd6_recalc_reachtm_interval) = ND6_RECALC_REACHTM_INTERVAL; 145 #define V_nd6_recalc_reachtm_interval VNET(nd6_recalc_reachtm_interval) 146 147 int (*send_sendso_input_hook)(struct mbuf *, struct ifnet *, int, int); 148 149 static bool nd6_is_new_addr_neighbor(const struct sockaddr_in6 *, 150 struct ifnet *); 151 static void nd6_slowtimo(void *); 152 static int regen_tmpaddr(struct in6_ifaddr *); 153 static void nd6_free(struct llentry **, int); 154 static void nd6_free_redirect(const struct llentry *); 155 static void nd6_llinfo_timer(void *); 156 static void nd6_llinfo_settimer_locked(struct llentry *, long); 157 static int nd6_resolve_slow(struct ifnet *, int, int, struct mbuf *, 158 const struct sockaddr_in6 *, u_char *, uint32_t *, struct llentry **); 159 static int nd6_need_cache(struct ifnet *); 160 161 VNET_DEFINE_STATIC(struct callout, nd6_slowtimo_ch); 162 #define V_nd6_slowtimo_ch VNET(nd6_slowtimo_ch) 163 164 VNET_DEFINE_STATIC(struct callout, nd6_timer_ch); 165 #define V_nd6_timer_ch VNET(nd6_timer_ch) 166 167 static void 168 nd6_lle_event(void *arg __unused, struct llentry *lle, int evt) 169 { 170 struct rt_addrinfo rtinfo; 171 struct sockaddr_in6 dst; 172 struct sockaddr_dl gw; 173 struct ifnet *ifp; 174 int type; 175 int fibnum; 176 177 LLE_WLOCK_ASSERT(lle); 178 179 if (lltable_get_af(lle->lle_tbl) != AF_INET6) 180 return; 181 182 switch (evt) { 183 case LLENTRY_RESOLVED: 184 type = RTM_ADD; 185 KASSERT(lle->la_flags & LLE_VALID, 186 ("%s: %p resolved but not valid?", __func__, lle)); 187 break; 188 case LLENTRY_EXPIRED: 189 type = RTM_DELETE; 190 break; 191 default: 192 return; 193 } 194 195 ifp = lltable_get_ifp(lle->lle_tbl); 196 197 bzero(&dst, sizeof(dst)); 198 bzero(&gw, sizeof(gw)); 199 bzero(&rtinfo, sizeof(rtinfo)); 200 lltable_fill_sa_entry(lle, (struct sockaddr *)&dst); 201 dst.sin6_scope_id = in6_getscopezone(ifp, 202 in6_addrscope(&dst.sin6_addr)); 203 gw.sdl_len = sizeof(struct sockaddr_dl); 204 gw.sdl_family = AF_LINK; 205 gw.sdl_alen = ifp->if_addrlen; 206 gw.sdl_index = ifp->if_index; 207 gw.sdl_type = ifp->if_type; 208 if (evt == LLENTRY_RESOLVED) 209 bcopy(lle->ll_addr, gw.sdl_data, ifp->if_addrlen); 210 rtinfo.rti_info[RTAX_DST] = (struct sockaddr *)&dst; 211 rtinfo.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&gw; 212 rtinfo.rti_addrs = RTA_DST | RTA_GATEWAY; 213 fibnum = V_rt_add_addr_allfibs ? RT_ALL_FIBS : ifp->if_fib; 214 rt_missmsg_fib(type, &rtinfo, RTF_HOST | RTF_LLDATA | ( 215 type == RTM_ADD ? RTF_UP: 0), 0, fibnum); 216 } 217 218 /* 219 * A handler for interface link layer address change event. 220 */ 221 static void 222 nd6_iflladdr(void *arg __unused, struct ifnet *ifp) 223 { 224 /* XXXGL: ??? */ 225 if (ifp->if_inet6 == NULL) 226 return; 227 228 lltable_update_ifaddr(LLTABLE6(ifp)); 229 } 230 231 void 232 nd6_init(void) 233 { 234 235 mtx_init(&V_nd6_onlink_mtx, "nd6 onlink", NULL, MTX_DEF); 236 rw_init(&V_nd6_lock, "nd6 list"); 237 238 LIST_INIT(&V_nd_prefix); 239 nd6_defrouter_init(); 240 241 /* Start timers. */ 242 callout_init(&V_nd6_slowtimo_ch, 1); 243 callout_reset(&V_nd6_slowtimo_ch, ND6_SLOWTIMER_INTERVAL * hz, 244 nd6_slowtimo, curvnet); 245 246 callout_init(&V_nd6_timer_ch, 1); 247 callout_reset(&V_nd6_timer_ch, hz, nd6_timer, curvnet); 248 249 nd6_dad_init(); 250 if (IS_DEFAULT_VNET(curvnet)) { 251 lle_event_eh = EVENTHANDLER_REGISTER(lle_event, nd6_lle_event, 252 NULL, EVENTHANDLER_PRI_ANY); 253 iflladdr_event_eh = EVENTHANDLER_REGISTER(iflladdr_event, 254 nd6_iflladdr, NULL, EVENTHANDLER_PRI_ANY); 255 ifnet_link_event_eh = EVENTHANDLER_REGISTER(ifnet_link_event, 256 nd6_ifnet_link_event, NULL, EVENTHANDLER_PRI_ANY); 257 } 258 } 259 260 #ifdef VIMAGE 261 void 262 nd6_destroy(void) 263 { 264 265 callout_drain(&V_nd6_slowtimo_ch); 266 callout_drain(&V_nd6_timer_ch); 267 if (IS_DEFAULT_VNET(curvnet)) { 268 EVENTHANDLER_DEREGISTER(ifnet_link_event, ifnet_link_event_eh); 269 EVENTHANDLER_DEREGISTER(lle_event, lle_event_eh); 270 EVENTHANDLER_DEREGISTER(iflladdr_event, iflladdr_event_eh); 271 } 272 rw_destroy(&V_nd6_lock); 273 mtx_destroy(&V_nd6_onlink_mtx); 274 } 275 #endif 276 277 void 278 nd6_ifattach(struct ifnet *ifp) 279 { 280 struct in6_ifextra *nd = ifp->if_inet6; 281 282 nd->nd_linkmtu = 0; 283 nd->nd_maxmtu = ifp->if_mtu; 284 nd->nd_basereachable = REACHABLE_TIME; 285 nd->nd_reachable = ND_COMPUTE_RTIME(nd->nd_basereachable); 286 nd->nd_retrans = RETRANS_TIMER; 287 nd->nd_recalc_timer = 0; 288 nd->nd_dad_failures = 0; 289 nd->nd_curhoplimit = IPV6_DEFHLIM; 290 291 nd->nd_flags = ND6_IFF_PERFORMNUD; 292 293 /* Set IPv6 disabled on all interfaces but loopback by default. */ 294 if ((ifp->if_flags & IFF_LOOPBACK) == 0) { 295 nd->nd_flags |= ND6_IFF_IFDISABLED; 296 if (V_ip6_no_radr) 297 nd->nd_flags |= ND6_IFF_NO_RADR; 298 if (V_ip6_use_stableaddr) 299 nd->nd_flags |= ND6_IFF_STABLEADDR; 300 } 301 302 /* A loopback interface always has ND6_IFF_AUTO_LINKLOCAL. 303 * XXXHRS: Clear ND6_IFF_AUTO_LINKLOCAL on an IFT_BRIDGE interface by 304 * default regardless of the V_ip6_auto_linklocal configuration to 305 * give a reasonable default behavior. 306 */ 307 if ((V_ip6_auto_linklocal && ifp->if_type != IFT_BRIDGE && 308 ifp->if_type != IFT_WIREGUARD) || (ifp->if_flags & IFF_LOOPBACK)) 309 nd->nd_flags |= ND6_IFF_AUTO_LINKLOCAL; 310 /* 311 * A loopback interface does not need to accept RTADV. 312 * XXXHRS: Clear ND6_IFF_ACCEPT_RTADV on an IFT_BRIDGE interface by 313 * default regardless of the V_ip6_accept_rtadv configuration to 314 * prevent the interface from accepting RA messages arrived 315 * on one of the member interfaces with ND6_IFF_ACCEPT_RTADV. 316 */ 317 if (V_ip6_accept_rtadv && 318 !(ifp->if_flags & IFF_LOOPBACK) && 319 (ifp->if_type != IFT_BRIDGE)) { 320 nd->nd_flags |= ND6_IFF_ACCEPT_RTADV; 321 /* If we globally accept rtadv, assume IPv6 on. */ 322 nd->nd_flags &= ~ND6_IFF_IFDISABLED; 323 } 324 } 325 326 void 327 nd6_ifdetach(struct ifnet *ifp) 328 { 329 struct epoch_tracker et; 330 struct ifaddr *ifa, *next; 331 332 NET_EPOCH_ENTER(et); 333 CK_STAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 334 if (ifa->ifa_addr->sa_family != AF_INET6) 335 continue; 336 337 /* stop DAD processing */ 338 nd6_dad_stop(ifa); 339 } 340 NET_EPOCH_EXIT(et); 341 } 342 343 /* 344 * Reset ND level link MTU. This function is called when the physical MTU 345 * changes, which means we might have to adjust the ND level MTU. 346 * XXX todo: do not maintain copy of ifp->if_mtu in if_inet6->nd_maxmtu. 347 */ 348 void 349 nd6_setmtu(struct ifnet *ifp) 350 { 351 struct in6_ifextra *ndi = ifp->if_inet6; 352 uint32_t omaxmtu; 353 354 /* XXXGL: safety against IFT_PFSYNC & IFT_PFLOG */ 355 if (ndi == NULL) 356 return; 357 358 omaxmtu = ndi->nd_maxmtu; 359 ndi->nd_maxmtu = ifp->if_mtu; 360 361 /* 362 * Decreasing the interface MTU under IPV6 minimum MTU may cause 363 * undesirable situation. We thus notify the operator of the change 364 * explicitly. The check for omaxmtu is necessary to restrict the 365 * log to the case of changing the MTU, not initializing it. 366 */ 367 if (omaxmtu >= IPV6_MMTU && ndi->nd_maxmtu < IPV6_MMTU) { 368 log(LOG_NOTICE, "%s: " 369 "new link MTU on %s (%lu) is too small for IPv6\n", 370 __func__, if_name(ifp), (unsigned long)ndi->nd_maxmtu); 371 } 372 } 373 374 void 375 nd6_option_init(void *opt, int icmp6len, union nd_opts *ndopts) 376 { 377 378 bzero(ndopts, sizeof(*ndopts)); 379 ndopts->nd_opts_search = (struct nd_opt_hdr *)opt; 380 ndopts->nd_opts_last 381 = (struct nd_opt_hdr *)(((u_char *)opt) + icmp6len); 382 383 if (icmp6len == 0) { 384 ndopts->nd_opts_done = 1; 385 ndopts->nd_opts_search = NULL; 386 } 387 } 388 389 /* 390 * Take one ND option. 391 */ 392 struct nd_opt_hdr * 393 nd6_option(union nd_opts *ndopts) 394 { 395 struct nd_opt_hdr *nd_opt; 396 int olen; 397 398 KASSERT(ndopts != NULL, ("%s: ndopts == NULL", __func__)); 399 KASSERT(ndopts->nd_opts_last != NULL, ("%s: uninitialized ndopts", 400 __func__)); 401 if (ndopts->nd_opts_search == NULL) 402 return NULL; 403 if (ndopts->nd_opts_done) 404 return NULL; 405 406 nd_opt = ndopts->nd_opts_search; 407 408 /* make sure nd_opt_len is inside the buffer */ 409 if ((caddr_t)&nd_opt->nd_opt_len >= (caddr_t)ndopts->nd_opts_last) { 410 bzero(ndopts, sizeof(*ndopts)); 411 return NULL; 412 } 413 414 olen = nd_opt->nd_opt_len << 3; 415 if (olen == 0) { 416 /* 417 * Message validation requires that all included 418 * options have a length that is greater than zero. 419 */ 420 bzero(ndopts, sizeof(*ndopts)); 421 return NULL; 422 } 423 424 ndopts->nd_opts_search = (struct nd_opt_hdr *)((caddr_t)nd_opt + olen); 425 if (ndopts->nd_opts_search > ndopts->nd_opts_last) { 426 /* option overruns the end of buffer, invalid */ 427 bzero(ndopts, sizeof(*ndopts)); 428 return NULL; 429 } else if (ndopts->nd_opts_search == ndopts->nd_opts_last) { 430 /* reached the end of options chain */ 431 ndopts->nd_opts_done = 1; 432 ndopts->nd_opts_search = NULL; 433 } 434 return nd_opt; 435 } 436 437 /* 438 * Parse multiple ND options. 439 * This function is much easier to use, for ND routines that do not need 440 * multiple options of the same type. 441 */ 442 int 443 nd6_options(union nd_opts *ndopts) 444 { 445 struct nd_opt_hdr *nd_opt; 446 int i = 0; 447 448 KASSERT(ndopts != NULL, ("%s: ndopts == NULL", __func__)); 449 KASSERT(ndopts->nd_opts_last != NULL, ("%s: uninitialized ndopts", 450 __func__)); 451 if (ndopts->nd_opts_search == NULL) 452 return 0; 453 454 while (1) { 455 nd_opt = nd6_option(ndopts); 456 if (nd_opt == NULL && ndopts->nd_opts_last == NULL) { 457 /* 458 * Message validation requires that all included 459 * options have a length that is greater than zero. 460 */ 461 ICMP6STAT_INC(icp6s_nd_badopt); 462 bzero(ndopts, sizeof(*ndopts)); 463 return -1; 464 } 465 466 if (nd_opt == NULL) 467 goto skip1; 468 469 switch (nd_opt->nd_opt_type) { 470 case ND_OPT_SOURCE_LINKADDR: 471 case ND_OPT_TARGET_LINKADDR: 472 case ND_OPT_MTU: 473 case ND_OPT_REDIRECTED_HEADER: 474 case ND_OPT_NONCE: 475 if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) { 476 nd6log((LOG_INFO, 477 "duplicated ND6 option found (type=%d)\n", 478 nd_opt->nd_opt_type)); 479 /* XXX bark? */ 480 } else { 481 ndopts->nd_opt_array[nd_opt->nd_opt_type] 482 = nd_opt; 483 } 484 break; 485 case ND_OPT_PREFIX_INFORMATION: 486 if (ndopts->nd_opt_array[nd_opt->nd_opt_type] == 0) { 487 ndopts->nd_opt_array[nd_opt->nd_opt_type] 488 = nd_opt; 489 } 490 ndopts->nd_opts_pi_end = 491 (struct nd_opt_prefix_info *)nd_opt; 492 break; 493 /* What about ND_OPT_ROUTE_INFO? RFC 4191 */ 494 case ND_OPT_RDNSS: /* RFC 6106 */ 495 case ND_OPT_DNSSL: /* RFC 6106 */ 496 /* 497 * Silently ignore options we know and do not care about 498 * in the kernel. 499 */ 500 break; 501 default: 502 /* 503 * Unknown options must be silently ignored, 504 * to accommodate future extension to the protocol. 505 */ 506 nd6log((LOG_DEBUG, 507 "nd6_options: unsupported option %d - " 508 "option ignored\n", nd_opt->nd_opt_type)); 509 } 510 511 skip1: 512 i++; 513 if (i > V_nd6_maxndopt) { 514 ICMP6STAT_INC(icp6s_nd_toomanyopt); 515 nd6log((LOG_INFO, "too many loop in nd opt\n")); 516 break; 517 } 518 519 if (ndopts->nd_opts_done) 520 break; 521 } 522 523 return 0; 524 } 525 526 /* 527 * ND6 timer routine to handle ND6 entries 528 */ 529 static void 530 nd6_llinfo_settimer_locked(struct llentry *ln, long tick) 531 { 532 int canceled; 533 534 LLE_WLOCK_ASSERT(ln); 535 536 /* Do not schedule timers for child LLEs. */ 537 if (ln->la_flags & LLE_CHILD) 538 return; 539 540 if (tick < 0) { 541 ln->la_expire = 0; 542 ln->ln_ntick = 0; 543 canceled = callout_stop(&ln->lle_timer); 544 } else { 545 ln->la_expire = time_uptime + tick / hz; 546 LLE_ADDREF(ln); 547 if (tick > INT_MAX) { 548 ln->ln_ntick = tick - INT_MAX; 549 canceled = callout_reset(&ln->lle_timer, INT_MAX, 550 nd6_llinfo_timer, ln); 551 } else { 552 ln->ln_ntick = 0; 553 canceled = callout_reset(&ln->lle_timer, tick, 554 nd6_llinfo_timer, ln); 555 } 556 } 557 if (canceled > 0) 558 LLE_REMREF(ln); 559 } 560 561 /* 562 * Gets source address of the first packet in hold queue 563 * and stores it in @src. 564 * Returns pointer to @src (if hold queue is not empty) or NULL. 565 * 566 * Set noinline to be dtrace-friendly 567 */ 568 static __noinline struct in6_addr * 569 nd6_llinfo_get_holdsrc(struct llentry *ln, struct in6_addr *src) 570 { 571 struct ip6_hdr hdr; 572 struct mbuf *m; 573 574 if (ln->la_hold == NULL) 575 return (NULL); 576 577 /* 578 * assume every packet in la_hold has the same IP header 579 */ 580 m = ln->la_hold; 581 if (sizeof(hdr) > m->m_len) 582 return (NULL); 583 584 m_copydata(m, 0, sizeof(hdr), (caddr_t)&hdr); 585 *src = hdr.ip6_src; 586 587 return (src); 588 } 589 590 /* 591 * Checks if we need to switch from STALE state. 592 * 593 * RFC 4861 requires switching from STALE to DELAY state 594 * on first packet matching entry, waiting V_nd6_delay and 595 * transition to PROBE state (if upper layer confirmation was 596 * not received). 597 * 598 * This code performs a bit differently: 599 * On packet hit we don't change state (but desired state 600 * can be guessed by control plane). However, after V_nd6_delay 601 * seconds code will transition to PROBE state (so DELAY state 602 * is kinda skipped in most situations). 603 * 604 * Typically, V_nd6_gctimer is bigger than V_nd6_delay, so 605 * we perform the following upon entering STALE state: 606 * 607 * 1) Arm timer to run each V_nd6_delay seconds to make sure that 608 * if packet was transmitted at the start of given interval, we 609 * would be able to switch to PROBE state in V_nd6_delay seconds 610 * as user expects. 611 * 612 * 2) Reschedule timer until original V_nd6_gctimer expires keeping 613 * lle in STALE state (remaining timer value stored in lle_remtime). 614 * 615 * 3) Reschedule timer if packet was transmitted less that V_nd6_delay 616 * seconds ago. 617 * 618 * Returns non-zero value if the entry is still STALE (storing 619 * the next timer interval in @pdelay). 620 * 621 * Returns zero value if original timer expired or we need to switch to 622 * PROBE (store that in @do_switch variable). 623 */ 624 static int 625 nd6_is_stale(struct llentry *lle, long *pdelay, int *do_switch) 626 { 627 int nd_delay, nd_gctimer; 628 time_t lle_hittime; 629 long delay; 630 631 *do_switch = 0; 632 nd_gctimer = V_nd6_gctimer; 633 nd_delay = V_nd6_delay; 634 635 lle_hittime = llentry_get_hittime(lle); 636 637 if (lle_hittime == 0) { 638 /* 639 * Datapath feedback has been requested upon entering 640 * STALE state. No packets has been passed using this lle. 641 * Ask for the timer reschedule and keep STALE state. 642 */ 643 delay = (long)(MIN(nd_gctimer, nd_delay)); 644 delay *= hz; 645 if (lle->lle_remtime > delay) 646 lle->lle_remtime -= delay; 647 else { 648 delay = lle->lle_remtime; 649 lle->lle_remtime = 0; 650 } 651 652 if (delay == 0) { 653 /* 654 * The original ng6_gctime timeout ended, 655 * no more rescheduling. 656 */ 657 return (0); 658 } 659 660 *pdelay = delay; 661 return (1); 662 } 663 664 /* 665 * Packet received. Verify timestamp 666 */ 667 delay = (long)(time_uptime - lle_hittime); 668 if (delay < nd_delay) { 669 /* 670 * V_nd6_delay still not passed since the first 671 * hit in STALE state. 672 * Reschedule timer and return. 673 */ 674 *pdelay = (long)(nd_delay - delay) * hz; 675 return (1); 676 } 677 678 /* Request switching to probe */ 679 *do_switch = 1; 680 return (0); 681 } 682 683 /* 684 * Switch @lle state to new state optionally arming timers. 685 * 686 * Set noinline to be dtrace-friendly 687 */ 688 __noinline void 689 nd6_llinfo_setstate(struct llentry *lle, int newstate) 690 { 691 struct ifnet *ifp; 692 int nd_gctimer, nd_delay; 693 long delay, remtime; 694 695 delay = 0; 696 remtime = 0; 697 698 switch (newstate) { 699 case ND6_LLINFO_INCOMPLETE: 700 ifp = lle->lle_tbl->llt_ifp; 701 delay = (long)ifp->if_inet6->nd_retrans * hz / 1000; 702 break; 703 case ND6_LLINFO_REACHABLE: 704 if (!ND6_LLINFO_PERMANENT(lle)) { 705 ifp = lle->lle_tbl->llt_ifp; 706 delay = (long)ifp->if_inet6->nd_reachable * hz; 707 } 708 break; 709 case ND6_LLINFO_STALE: 710 711 llentry_request_feedback(lle); 712 nd_delay = V_nd6_delay; 713 nd_gctimer = V_nd6_gctimer; 714 715 delay = (long)(MIN(nd_gctimer, nd_delay)) * hz; 716 remtime = (long)nd_gctimer * hz - delay; 717 break; 718 case ND6_LLINFO_DELAY: 719 lle->la_asked = 0; 720 delay = (long)V_nd6_delay * hz; 721 break; 722 } 723 724 if (delay > 0) 725 nd6_llinfo_settimer_locked(lle, delay); 726 727 lle->lle_remtime = remtime; 728 lle->ln_state = newstate; 729 } 730 731 /* 732 * Timer-dependent part of nd state machine. 733 * 734 * Set noinline to be dtrace-friendly 735 */ 736 static __noinline void 737 nd6_llinfo_timer(void *arg) 738 { 739 struct epoch_tracker et; 740 struct llentry *ln; 741 struct in6_addr *dst, *pdst, *psrc, src; 742 struct ifnet *ifp; 743 struct in6_ifextra *ndi; 744 int do_switch, send_ns; 745 long delay; 746 747 KASSERT(arg != NULL, ("%s: arg NULL", __func__)); 748 ln = (struct llentry *)arg; 749 ifp = lltable_get_ifp(ln->lle_tbl); 750 CURVNET_SET(ifp->if_vnet); 751 752 ND6_RLOCK(); 753 LLE_WLOCK(ln); 754 if (callout_pending(&ln->lle_timer)) { 755 /* 756 * Here we are a bit odd here in the treatment of 757 * active/pending. If the pending bit is set, it got 758 * rescheduled before I ran. The active 759 * bit we ignore, since if it was stopped 760 * in ll_tablefree() and was currently running 761 * it would have return 0 so the code would 762 * not have deleted it since the callout could 763 * not be stopped so we want to go through 764 * with the delete here now. If the callout 765 * was restarted, the pending bit will be back on and 766 * we just want to bail since the callout_reset would 767 * return 1 and our reference would have been removed 768 * by nd6_llinfo_settimer_locked above since canceled 769 * would have been 1. 770 */ 771 LLE_WUNLOCK(ln); 772 ND6_RUNLOCK(); 773 CURVNET_RESTORE(); 774 return; 775 } 776 NET_EPOCH_ENTER(et); 777 ndi = ifp->if_inet6; 778 send_ns = 0; 779 dst = &ln->r_l3addr.addr6; 780 pdst = dst; 781 782 if (ln->ln_ntick > 0) { 783 if (ln->ln_ntick > INT_MAX) { 784 ln->ln_ntick -= INT_MAX; 785 nd6_llinfo_settimer_locked(ln, INT_MAX); 786 } else { 787 ln->ln_ntick = 0; 788 nd6_llinfo_settimer_locked(ln, ln->ln_ntick); 789 } 790 goto done; 791 } 792 793 if (ln->la_flags & LLE_STATIC) { 794 goto done; 795 } 796 797 if (ln->la_flags & LLE_DELETED) { 798 nd6_free(&ln, 0); 799 goto done; 800 } 801 802 switch (ln->ln_state) { 803 case ND6_LLINFO_INCOMPLETE: 804 if (ln->la_asked < V_nd6_mmaxtries) { 805 ln->la_asked++; 806 send_ns = 1; 807 /* Send NS to multicast address */ 808 pdst = NULL; 809 } else { 810 struct mbuf *m; 811 812 ICMP6STAT_ADD(icp6s_dropped, ln->la_numheld); 813 814 m = ln->la_hold; 815 if (m != NULL) { 816 /* 817 * assuming every packet in la_hold has the 818 * same IP header. Send error after unlock. 819 */ 820 ln->la_hold = m->m_nextpkt; 821 m->m_nextpkt = NULL; 822 ln->la_numheld--; 823 } 824 nd6_free(&ln, 0); 825 if (m != NULL) { 826 struct mbuf *n = m; 827 828 /* 829 * if there are any ummapped mbufs, we 830 * must free them, rather than using 831 * them for an ICMP, as they cannot be 832 * checksummed. 833 */ 834 while ((n = n->m_next) != NULL) { 835 if (n->m_flags & M_EXTPG) 836 break; 837 } 838 if (n != NULL) { 839 m_freem(m); 840 m = NULL; 841 } else { 842 icmp6_error2(m, ICMP6_DST_UNREACH, 843 ICMP6_DST_UNREACH_ADDR, 0, ifp); 844 } 845 } 846 } 847 break; 848 case ND6_LLINFO_REACHABLE: 849 if (!ND6_LLINFO_PERMANENT(ln)) 850 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE); 851 break; 852 853 case ND6_LLINFO_STALE: 854 if (nd6_is_stale(ln, &delay, &do_switch) != 0) { 855 /* 856 * No packet has used this entry and GC timeout 857 * has not been passed. Reschedule timer and 858 * return. 859 */ 860 nd6_llinfo_settimer_locked(ln, delay); 861 break; 862 } 863 864 if (do_switch == 0) { 865 /* 866 * GC timer has ended and entry hasn't been used. 867 * Run Garbage collector (RFC 4861, 5.3) 868 */ 869 if (!ND6_LLINFO_PERMANENT(ln)) 870 nd6_free(&ln, 1); 871 break; 872 } 873 874 /* Entry has been used AND delay timer has ended. */ 875 876 /* FALLTHROUGH */ 877 878 case ND6_LLINFO_DELAY: 879 if ((ndi->nd_flags & ND6_IFF_PERFORMNUD) != 0) { 880 /* We need NUD */ 881 ln->la_asked = 1; 882 nd6_llinfo_setstate(ln, ND6_LLINFO_PROBE); 883 send_ns = 1; 884 } else 885 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE); /* XXX */ 886 break; 887 case ND6_LLINFO_PROBE: 888 if (ln->la_asked < V_nd6_umaxtries) { 889 ln->la_asked++; 890 send_ns = 1; 891 } else { 892 nd6_free(&ln, 0); 893 } 894 break; 895 default: 896 panic("%s: paths in a dark night can be confusing: %d", 897 __func__, ln->ln_state); 898 } 899 done: 900 if (ln != NULL) 901 ND6_RUNLOCK(); 902 if (send_ns != 0) { 903 nd6_llinfo_settimer_locked(ln, 904 (long)ndi->nd_retrans * hz / 1000); 905 psrc = nd6_llinfo_get_holdsrc(ln, &src); 906 LLE_FREE_LOCKED(ln); 907 ln = NULL; 908 nd6_ns_output(ifp, psrc, pdst, dst, NULL); 909 } 910 911 if (ln != NULL) 912 LLE_FREE_LOCKED(ln); 913 NET_EPOCH_EXIT(et); 914 CURVNET_RESTORE(); 915 } 916 917 /* 918 * ND6 timer routine to expire default route list and prefix list 919 */ 920 void 921 nd6_timer(void *arg) 922 { 923 CURVNET_SET((struct vnet *) arg); 924 struct epoch_tracker et; 925 struct nd_prhead prl; 926 struct nd_prefix *pr, *npr; 927 struct ifnet *ifp; 928 struct in6_ifaddr *ia6, *nia6; 929 uint64_t genid; 930 931 LIST_INIT(&prl); 932 933 NET_EPOCH_ENTER(et); 934 nd6_defrouter_timer(); 935 936 /* 937 * expire interface addresses. 938 * in the past the loop was inside prefix expiry processing. 939 * However, from a stricter speci-confrmance standpoint, we should 940 * rather separate address lifetimes and prefix lifetimes. 941 * 942 * XXXRW: in6_ifaddrhead locking. 943 */ 944 addrloop: 945 CK_STAILQ_FOREACH_SAFE(ia6, &V_in6_ifaddrhead, ia_link, nia6) { 946 /* check address lifetime */ 947 if (IFA6_IS_INVALID(ia6)) { 948 int regen = 0; 949 950 /* 951 * If the expiring address is temporary, try 952 * regenerating a new one. This would be useful when 953 * we suspended a laptop PC, then turned it on after a 954 * period that could invalidate all temporary 955 * addresses. Although we may have to restart the 956 * loop (see below), it must be after purging the 957 * address. Otherwise, we'd see an infinite loop of 958 * regeneration. 959 */ 960 if (V_ip6_use_tempaddr && 961 (ia6->ia6_flags & IN6_IFF_TEMPORARY) != 0) { 962 if (regen_tmpaddr(ia6) == 0) 963 regen = 1; 964 } 965 966 in6_purgeaddr(&ia6->ia_ifa); 967 968 if (regen) 969 goto addrloop; /* XXX: see below */ 970 } else if (IFA6_IS_DEPRECATED(ia6)) { 971 int oldflags = ia6->ia6_flags; 972 973 ia6->ia6_flags |= IN6_IFF_DEPRECATED; 974 975 /* 976 * If a temporary address has just become deprecated, 977 * regenerate a new one if possible. 978 */ 979 if (V_ip6_use_tempaddr && 980 (ia6->ia6_flags & IN6_IFF_TEMPORARY) != 0 && 981 (oldflags & IN6_IFF_DEPRECATED) == 0) { 982 if (regen_tmpaddr(ia6) == 0) { 983 /* 984 * A new temporary address is 985 * generated. 986 * XXX: this means the address chain 987 * has changed while we are still in 988 * the loop. Although the change 989 * would not cause disaster (because 990 * it's not a deletion, but an 991 * addition,) we'd rather restart the 992 * loop just for safety. Or does this 993 * significantly reduce performance?? 994 */ 995 goto addrloop; 996 } 997 } 998 } else if ((ia6->ia6_flags & IN6_IFF_TENTATIVE) != 0) { 999 /* 1000 * Schedule DAD for a tentative address. This happens 1001 * if the interface was down or not running 1002 * when the address was configured. 1003 */ 1004 int delay; 1005 1006 delay = arc4random() % 1007 (MAX_RTR_SOLICITATION_DELAY * hz); 1008 nd6_dad_start((struct ifaddr *)ia6, delay); 1009 } else { 1010 /* 1011 * Check status of the interface. If it is down, 1012 * mark the address as tentative for future DAD. 1013 */ 1014 ifp = ia6->ia_ifp; 1015 if ((ifp->if_inet6->nd_flags & ND6_IFF_NO_DAD) == 0 && 1016 ((ifp->if_flags & IFF_UP) == 0 || 1017 (ifp->if_drv_flags & IFF_DRV_RUNNING) == 0 || 1018 (ifp->if_inet6->nd_flags & ND6_IFF_IFDISABLED))){ 1019 ia6->ia6_flags &= ~IN6_IFF_DUPLICATED; 1020 ia6->ia6_flags |= IN6_IFF_TENTATIVE; 1021 } 1022 1023 /* 1024 * A new RA might have made a deprecated address 1025 * preferred. 1026 */ 1027 ia6->ia6_flags &= ~IN6_IFF_DEPRECATED; 1028 } 1029 } 1030 NET_EPOCH_EXIT(et); 1031 1032 ND6_WLOCK(); 1033 restart: 1034 LIST_FOREACH_SAFE(pr, &V_nd_prefix, ndpr_entry, npr) { 1035 /* 1036 * Expire prefixes. Since the pltime is only used for 1037 * autoconfigured addresses, pltime processing for prefixes is 1038 * not necessary. 1039 * 1040 * Only unlink after all derived addresses have expired. This 1041 * may not occur until two hours after the prefix has expired 1042 * per RFC 4862. If the prefix expires before its derived 1043 * addresses, mark it off-link. This will be done automatically 1044 * after unlinking if no address references remain. 1045 */ 1046 if (pr->ndpr_vltime == ND6_INFINITE_LIFETIME || 1047 time_uptime - pr->ndpr_lastupdate <= pr->ndpr_vltime) 1048 continue; 1049 1050 if (pr->ndpr_addrcnt == 0) { 1051 nd6_prefix_unlink(pr, &prl); 1052 continue; 1053 } 1054 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0) { 1055 genid = V_nd6_list_genid; 1056 nd6_prefix_ref(pr); 1057 ND6_WUNLOCK(); 1058 ND6_ONLINK_LOCK(); 1059 (void)nd6_prefix_offlink(pr); 1060 ND6_ONLINK_UNLOCK(); 1061 ND6_WLOCK(); 1062 nd6_prefix_rele(pr); 1063 if (genid != V_nd6_list_genid) 1064 goto restart; 1065 } 1066 } 1067 ND6_WUNLOCK(); 1068 1069 while ((pr = LIST_FIRST(&prl)) != NULL) { 1070 LIST_REMOVE(pr, ndpr_entry); 1071 nd6_prefix_del(pr); 1072 } 1073 1074 callout_reset(&V_nd6_timer_ch, V_nd6_prune * hz, 1075 nd6_timer, curvnet); 1076 1077 CURVNET_RESTORE(); 1078 } 1079 1080 /* 1081 * ia6 - deprecated/invalidated temporary address 1082 */ 1083 static int 1084 regen_tmpaddr(struct in6_ifaddr *ia6) 1085 { 1086 struct ifaddr *ifa; 1087 struct ifnet *ifp; 1088 struct in6_ifaddr *public_ifa6 = NULL; 1089 1090 NET_EPOCH_ASSERT(); 1091 1092 ifp = ia6->ia_ifa.ifa_ifp; 1093 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1094 struct in6_ifaddr *it6; 1095 1096 if (ifa->ifa_addr->sa_family != AF_INET6) 1097 continue; 1098 1099 it6 = (struct in6_ifaddr *)ifa; 1100 1101 /* ignore no autoconf addresses. */ 1102 if ((it6->ia6_flags & IN6_IFF_AUTOCONF) == 0) 1103 continue; 1104 1105 /* ignore autoconf addresses with different prefixes. */ 1106 if (it6->ia6_ndpr == NULL || it6->ia6_ndpr != ia6->ia6_ndpr) 1107 continue; 1108 1109 /* 1110 * Now we are looking at an autoconf address with the same 1111 * prefix as ours. If the address is temporary and is still 1112 * preferred, do not create another one. It would be rare, but 1113 * could happen, for example, when we resume a laptop PC after 1114 * a long period. 1115 */ 1116 if ((it6->ia6_flags & IN6_IFF_TEMPORARY) != 0 && 1117 !IFA6_IS_DEPRECATED(it6)) { 1118 public_ifa6 = NULL; 1119 break; 1120 } 1121 1122 /* 1123 * This is a public autoconf address that has the same prefix 1124 * as ours. If it is preferred, keep it. We can't break the 1125 * loop here, because there may be a still-preferred temporary 1126 * address with the prefix. 1127 */ 1128 if (!IFA6_IS_DEPRECATED(it6)) 1129 public_ifa6 = it6; 1130 } 1131 if (public_ifa6 != NULL) 1132 ifa_ref(&public_ifa6->ia_ifa); 1133 1134 if (public_ifa6 != NULL) { 1135 int e; 1136 1137 if ((e = in6_tmpifadd(public_ifa6, 0, 0)) != 0) { 1138 ifa_free(&public_ifa6->ia_ifa); 1139 log(LOG_NOTICE, "regen_tmpaddr: failed to create a new" 1140 " tmp addr,errno=%d\n", e); 1141 return (-1); 1142 } 1143 ifa_free(&public_ifa6->ia_ifa); 1144 return (0); 1145 } 1146 1147 return (-1); 1148 } 1149 1150 /* 1151 * Remove prefix and default router list entries corresponding to ifp. Neighbor 1152 * cache entries are freed in in6_domifdetach(). 1153 */ 1154 void 1155 nd6_purge(struct ifnet *ifp) 1156 { 1157 struct nd_prhead prl; 1158 struct nd_prefix *pr, *npr; 1159 1160 LIST_INIT(&prl); 1161 1162 /* Purge default router list entries toward ifp. */ 1163 nd6_defrouter_purge(ifp); 1164 1165 ND6_WLOCK(); 1166 /* 1167 * Remove prefixes on ifp. We should have already removed addresses on 1168 * this interface, so no addresses should be referencing these prefixes. 1169 */ 1170 LIST_FOREACH_SAFE(pr, &V_nd_prefix, ndpr_entry, npr) { 1171 if (pr->ndpr_ifp == ifp) 1172 nd6_prefix_unlink(pr, &prl); 1173 } 1174 ND6_WUNLOCK(); 1175 1176 /* Delete the unlinked prefix objects. */ 1177 while ((pr = LIST_FIRST(&prl)) != NULL) { 1178 LIST_REMOVE(pr, ndpr_entry); 1179 nd6_prefix_del(pr); 1180 } 1181 1182 /* cancel default outgoing interface setting */ 1183 if (V_nd6_defifindex == ifp->if_index) 1184 nd6_setdefaultiface(0); 1185 1186 if (ifp->if_inet6->nd_flags & ND6_IFF_ACCEPT_RTADV) { 1187 /* Refresh default router list. */ 1188 defrouter_select_fib(ifp->if_fib); 1189 } 1190 } 1191 1192 /* 1193 * the caller acquires and releases the lock on the lltbls 1194 * Returns the llentry locked 1195 */ 1196 struct llentry * 1197 nd6_lookup(const struct in6_addr *addr6, int flags, struct ifnet *ifp) 1198 { 1199 struct sockaddr_in6 sin6; 1200 struct llentry *ln; 1201 1202 bzero(&sin6, sizeof(sin6)); 1203 sin6.sin6_len = sizeof(struct sockaddr_in6); 1204 sin6.sin6_family = AF_INET6; 1205 sin6.sin6_addr = *addr6; 1206 1207 LLTABLE_RLOCK_ASSERT(LLTABLE6(ifp)); 1208 1209 ln = lla_lookup(LLTABLE6(ifp), flags, (struct sockaddr *)&sin6); 1210 1211 return (ln); 1212 } 1213 1214 static struct llentry * 1215 nd6_alloc(const struct in6_addr *addr6, int flags, struct ifnet *ifp) 1216 { 1217 struct sockaddr_in6 sin6; 1218 struct llentry *ln; 1219 1220 bzero(&sin6, sizeof(sin6)); 1221 sin6.sin6_len = sizeof(struct sockaddr_in6); 1222 sin6.sin6_family = AF_INET6; 1223 sin6.sin6_addr = *addr6; 1224 1225 ln = lltable_alloc_entry(LLTABLE6(ifp), 0, (struct sockaddr *)&sin6); 1226 if (ln != NULL) 1227 ln->ln_state = ND6_LLINFO_NOSTATE; 1228 1229 return (ln); 1230 } 1231 1232 /* 1233 * Test whether a given IPv6 address can be a neighbor. 1234 */ 1235 static bool 1236 nd6_is_new_addr_neighbor(const struct sockaddr_in6 *addr, struct ifnet *ifp) 1237 { 1238 1239 /* 1240 * A link-local address is always a neighbor. 1241 * XXX: a link does not necessarily specify a single interface. 1242 */ 1243 if (IN6_IS_ADDR_LINKLOCAL(&addr->sin6_addr)) { 1244 struct sockaddr_in6 sin6_copy; 1245 u_int32_t zone; 1246 1247 /* 1248 * We need sin6_copy since sa6_recoverscope() may modify the 1249 * content (XXX). 1250 */ 1251 sin6_copy = *addr; 1252 if (sa6_recoverscope(&sin6_copy)) 1253 return (0); /* XXX: should be impossible */ 1254 if (in6_setscope(&sin6_copy.sin6_addr, ifp, &zone)) 1255 return (0); 1256 if (sin6_copy.sin6_scope_id == zone) 1257 return (1); 1258 else 1259 return (0); 1260 } 1261 /* Checking global unicast */ 1262 1263 /* If an address is directly reachable, it is a neigbor */ 1264 struct nhop_object *nh; 1265 nh = fib6_lookup(ifp->if_fib, &addr->sin6_addr, 0, NHR_NONE, 0); 1266 if (nh != NULL && nh->nh_aifp == ifp && (nh->nh_flags & NHF_GATEWAY) == 0) 1267 return (true); 1268 1269 /* 1270 * Check prefixes with desired on-link state, as some may be not 1271 * installed in the routing table. 1272 */ 1273 bool matched = false; 1274 struct nd_prefix *pr; 1275 ND6_RLOCK(); 1276 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) { 1277 if (pr->ndpr_ifp != ifp) 1278 continue; 1279 if ((pr->ndpr_stateflags & NDPRF_ONLINK) == 0) 1280 continue; 1281 if (IN6_ARE_MASKED_ADDR_EQUAL(&pr->ndpr_prefix.sin6_addr, 1282 &addr->sin6_addr, &pr->ndpr_mask)) { 1283 matched = true; 1284 break; 1285 } 1286 } 1287 ND6_RUNLOCK(); 1288 if (matched) 1289 return (true); 1290 1291 /* 1292 * If the address is assigned on the node of the other side of 1293 * a p2p interface, the address should be a neighbor. 1294 */ 1295 if (ifp->if_flags & IFF_POINTOPOINT) { 1296 struct ifaddr *ifa; 1297 1298 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1299 if (ifa->ifa_addr->sa_family != addr->sin6_family) 1300 continue; 1301 if (ifa->ifa_dstaddr != NULL && 1302 sa_equal(addr, ifa->ifa_dstaddr)) { 1303 return (true); 1304 } 1305 } 1306 } 1307 1308 /* 1309 * If the default router list is empty, all addresses are regarded 1310 * as on-link, and thus, as a neighbor. 1311 */ 1312 if (ifp->if_inet6->nd_flags & ND6_IFF_ACCEPT_RTADV && 1313 nd6_defrouter_list_empty() && 1314 V_nd6_defifindex == ifp->if_index) { 1315 return (1); 1316 } 1317 1318 return (0); 1319 } 1320 1321 /* 1322 * Detect if a given IPv6 address identifies a neighbor on a given link. 1323 * XXX: should take care of the destination of a p2p link? 1324 */ 1325 int 1326 nd6_is_addr_neighbor(const struct sockaddr_in6 *addr, struct ifnet *ifp) 1327 { 1328 struct llentry *lle; 1329 int rc = 0; 1330 1331 NET_EPOCH_ASSERT(); 1332 1333 if (nd6_is_new_addr_neighbor(addr, ifp)) 1334 return (1); 1335 1336 /* 1337 * Even if the address matches none of our addresses, it might be 1338 * in the neighbor cache. 1339 */ 1340 if ((lle = nd6_lookup(&addr->sin6_addr, LLE_SF(AF_INET6, 0), ifp)) != NULL) { 1341 LLE_RUNLOCK(lle); 1342 rc = 1; 1343 } 1344 return (rc); 1345 } 1346 1347 static __noinline void 1348 nd6_free_children(struct llentry *lle) 1349 { 1350 struct llentry *child_lle; 1351 1352 NET_EPOCH_ASSERT(); 1353 LLE_WLOCK_ASSERT(lle); 1354 1355 while ((child_lle = CK_SLIST_FIRST(&lle->lle_children)) != NULL) { 1356 LLE_WLOCK(child_lle); 1357 lltable_unlink_child_entry(child_lle); 1358 llentry_free(child_lle); 1359 } 1360 } 1361 1362 /* 1363 * Tries to update @lle address/prepend data with new @lladdr. 1364 * 1365 * Returns true on success. 1366 * In any case, @lle is returned wlocked. 1367 */ 1368 static __noinline bool 1369 nd6_try_set_entry_addr_locked(struct ifnet *ifp, struct llentry *lle, char *lladdr) 1370 { 1371 u_char buf[LLE_MAX_LINKHDR]; 1372 int fam, off; 1373 size_t sz; 1374 1375 sz = sizeof(buf); 1376 if (lltable_calc_llheader(ifp, AF_INET6, lladdr, buf, &sz, &off) != 0) 1377 return (false); 1378 1379 /* Update data */ 1380 lltable_set_entry_addr(ifp, lle, buf, sz, off); 1381 1382 struct llentry *child_lle; 1383 CK_SLIST_FOREACH(child_lle, &lle->lle_children, lle_child_next) { 1384 LLE_WLOCK(child_lle); 1385 fam = child_lle->r_family; 1386 sz = sizeof(buf); 1387 if (lltable_calc_llheader(ifp, fam, lladdr, buf, &sz, &off) == 0) { 1388 /* success */ 1389 lltable_set_entry_addr(ifp, child_lle, buf, sz, off); 1390 child_lle->ln_state = ND6_LLINFO_REACHABLE; 1391 } 1392 LLE_WUNLOCK(child_lle); 1393 } 1394 1395 return (true); 1396 } 1397 1398 bool 1399 nd6_try_set_entry_addr(struct ifnet *ifp, struct llentry *lle, char *lladdr) 1400 { 1401 NET_EPOCH_ASSERT(); 1402 LLE_WLOCK_ASSERT(lle); 1403 1404 if (!lltable_trylock(lle)) 1405 return (false); 1406 bool ret = nd6_try_set_entry_addr_locked(ifp, lle, lladdr); 1407 LLTABLE_UNLOCK(lle->lle_tbl); 1408 1409 return (ret); 1410 } 1411 1412 /* 1413 * Free an nd6 llinfo entry. 1414 * Since the function would cause significant changes in the kernel, DO NOT 1415 * make it global, unless you have a strong reason for the change, and are sure 1416 * that the change is safe. 1417 * 1418 * Set noinline to be dtrace-friendly 1419 */ 1420 static __noinline void 1421 nd6_free(struct llentry **lnp, int gc) 1422 { 1423 struct ifnet *ifp; 1424 struct llentry *ln; 1425 struct nd_defrouter *dr; 1426 1427 ln = *lnp; 1428 *lnp = NULL; 1429 1430 LLE_WLOCK_ASSERT(ln); 1431 ND6_RLOCK_ASSERT(); 1432 1433 KASSERT((ln->la_flags & LLE_CHILD) == 0, ("child lle")); 1434 1435 ifp = lltable_get_ifp(ln->lle_tbl); 1436 if ((ifp->if_inet6->nd_flags & ND6_IFF_ACCEPT_RTADV) != 0) 1437 dr = defrouter_lookup_locked(&ln->r_l3addr.addr6, ifp); 1438 else 1439 dr = NULL; 1440 ND6_RUNLOCK(); 1441 1442 if ((ln->la_flags & LLE_DELETED) == 0) 1443 EVENTHANDLER_INVOKE(lle_event, ln, LLENTRY_EXPIRED); 1444 1445 /* 1446 * we used to have pfctlinput(PRC_HOSTDEAD) here. 1447 * even though it is not harmful, it was not really necessary. 1448 */ 1449 1450 /* cancel timer */ 1451 nd6_llinfo_settimer_locked(ln, -1); 1452 1453 if (ifp->if_inet6->nd_flags & ND6_IFF_ACCEPT_RTADV) { 1454 if (dr != NULL && dr->expire && 1455 ln->ln_state == ND6_LLINFO_STALE && gc) { 1456 /* 1457 * If the reason for the deletion is just garbage 1458 * collection, and the neighbor is an active default 1459 * router, do not delete it. Instead, reset the GC 1460 * timer using the router's lifetime. 1461 * Simply deleting the entry would affect default 1462 * router selection, which is not necessarily a good 1463 * thing, especially when we're using router preference 1464 * values. 1465 * XXX: the check for ln_state would be redundant, 1466 * but we intentionally keep it just in case. 1467 */ 1468 if (dr->expire > time_uptime) 1469 nd6_llinfo_settimer_locked(ln, 1470 (dr->expire - time_uptime) * hz); 1471 else 1472 nd6_llinfo_settimer_locked(ln, 1473 (long)V_nd6_gctimer * hz); 1474 1475 LLE_REMREF(ln); 1476 LLE_WUNLOCK(ln); 1477 defrouter_rele(dr); 1478 return; 1479 } 1480 1481 if (dr) { 1482 /* 1483 * Unreachability of a router might affect the default 1484 * router selection and on-link detection of advertised 1485 * prefixes. 1486 */ 1487 1488 /* 1489 * Temporarily fake the state to choose a new default 1490 * router and to perform on-link determination of 1491 * prefixes correctly. 1492 * Below the state will be set correctly, 1493 * or the entry itself will be deleted. 1494 */ 1495 ln->ln_state = ND6_LLINFO_INCOMPLETE; 1496 } 1497 1498 if (ln->ln_router || dr) { 1499 /* 1500 * We need to unlock to avoid a LOR with rt6_flush() with the 1501 * rnh and for the calls to pfxlist_onlink_check() and 1502 * defrouter_select_fib() in the block further down for calls 1503 * into nd6_lookup(). We still hold a ref. 1504 */ 1505 LLE_WUNLOCK(ln); 1506 1507 /* 1508 * rt6_flush must be called whether or not the neighbor 1509 * is in the Default Router List. 1510 * See a corresponding comment in nd6_na_input(). 1511 */ 1512 rt6_flush(&ln->r_l3addr.addr6, ifp); 1513 } 1514 1515 if (dr) { 1516 /* 1517 * Since defrouter_select_fib() does not affect the 1518 * on-link determination and MIP6 needs the check 1519 * before the default router selection, we perform 1520 * the check now. 1521 */ 1522 pfxlist_onlink_check(); 1523 1524 /* 1525 * Refresh default router list. 1526 */ 1527 defrouter_select_fib(dr->ifp->if_fib); 1528 } 1529 1530 /* 1531 * If this entry was added by an on-link redirect, remove the 1532 * corresponding host route. 1533 */ 1534 if (ln->la_flags & LLE_REDIRECT) 1535 nd6_free_redirect(ln); 1536 1537 if (ln->ln_router || dr) 1538 LLE_WLOCK(ln); 1539 } 1540 1541 /* 1542 * Save to unlock. We still hold an extra reference and will not 1543 * free(9) in llentry_free() if someone else holds one as well. 1544 */ 1545 LLE_WUNLOCK(ln); 1546 LLTABLE_LOCK(ln->lle_tbl); 1547 LLE_WLOCK(ln); 1548 /* Guard against race with other llentry_free(). */ 1549 if (ln->la_flags & LLE_LINKED) { 1550 /* Remove callout reference */ 1551 LLE_REMREF(ln); 1552 lltable_unlink_entry(ln->lle_tbl, ln); 1553 } 1554 LLTABLE_UNLOCK(ln->lle_tbl); 1555 1556 nd6_free_children(ln); 1557 1558 llentry_free(ln); 1559 if (dr != NULL) 1560 defrouter_rele(dr); 1561 } 1562 1563 static int 1564 nd6_isdynrte(const struct rtentry *rt, const struct nhop_object *nh, void *xap) 1565 { 1566 1567 if (nh->nh_flags & NHF_REDIRECT) 1568 return (1); 1569 1570 return (0); 1571 } 1572 1573 /* 1574 * Remove the rtentry for the given llentry, 1575 * both of which were installed by a redirect. 1576 */ 1577 static void 1578 nd6_free_redirect(const struct llentry *ln) 1579 { 1580 int fibnum; 1581 struct sockaddr_in6 sin6; 1582 struct rib_cmd_info rc; 1583 struct epoch_tracker et; 1584 1585 lltable_fill_sa_entry(ln, (struct sockaddr *)&sin6); 1586 1587 NET_EPOCH_ENTER(et); 1588 for (fibnum = 0; fibnum < rt_numfibs; fibnum++) 1589 rib_del_route_px(fibnum, (struct sockaddr *)&sin6, 128, 1590 nd6_isdynrte, NULL, 0, &rc); 1591 NET_EPOCH_EXIT(et); 1592 } 1593 1594 /* 1595 * Updates status of the default router route. 1596 */ 1597 static void 1598 check_release_defrouter(const struct rib_cmd_info *rc, void *_cbdata) 1599 { 1600 struct nd_defrouter *dr; 1601 struct nhop_object *nh; 1602 1603 nh = rc->rc_nh_old; 1604 if (rc->rc_cmd == RTM_DELETE && (nh->nh_flags & NHF_DEFAULT) != 0) { 1605 dr = defrouter_lookup(&nh->gw6_sa.sin6_addr, nh->nh_ifp); 1606 if (dr != NULL) { 1607 dr->installed = 0; 1608 defrouter_rele(dr); 1609 } 1610 } 1611 } 1612 1613 void 1614 nd6_subscription_cb(struct rib_head *rnh, struct rib_cmd_info *rc, void *arg) 1615 { 1616 #ifdef ROUTE_MPATH 1617 rib_decompose_notification(rc, check_release_defrouter, NULL); 1618 if (rc->rc_cmd == RTM_DELETE && !NH_IS_NHGRP(rc->rc_nh_old)) 1619 check_release_defrouter(rc, NULL); 1620 #else 1621 check_release_defrouter(rc, NULL); 1622 #endif 1623 } 1624 1625 int 1626 nd6_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp) 1627 { 1628 struct epoch_tracker et; 1629 struct in6_ndireq *ndi = (struct in6_ndireq *)data; 1630 struct in6_nbrinfo *nbi = (struct in6_nbrinfo *)data; 1631 struct in6_ndifreq *ndif = (struct in6_ndifreq *)data; 1632 struct in6_ifextra *ext = ifp->if_inet6; 1633 int error = 0; 1634 1635 /* XXXGL: safety against IFT_PFSYNC & IFT_PFLOG */ 1636 if (ext == NULL) 1637 return (EPFNOSUPPORT); 1638 #define ND ndi->ndi 1639 switch (cmd) { 1640 case SIOCGIFINFO_IN6: 1641 ND = (struct nd_ifinfo){ 1642 .linkmtu = ext->nd_linkmtu, 1643 .maxmtu = ext->nd_maxmtu, 1644 .basereachable = ext->nd_basereachable, 1645 .reachable = ext->nd_reachable, 1646 .retrans = ext->nd_retrans, 1647 .flags = ext->nd_flags, 1648 .recalctm = ext->nd_recalc_timer, 1649 .chlim = ext->nd_curhoplimit, 1650 .initialized = 1, 1651 }; 1652 break; 1653 case SIOCSIFINFO_IN6: 1654 /* 1655 * used to change host variables from userland. 1656 * intended for a use on router to reflect RA configurations. 1657 */ 1658 /* 0 means 'unspecified' */ 1659 if (ND.linkmtu != 0) { 1660 if (ND.linkmtu < IPV6_MMTU || 1661 ND.linkmtu > in6_ifmtu(ifp)) { 1662 error = EINVAL; 1663 break; 1664 } 1665 ext->nd_linkmtu = ND.linkmtu; 1666 } 1667 1668 if (ND.basereachable != 0) { 1669 uint32_t obasereachable = ext->nd_basereachable; 1670 1671 ext->nd_basereachable = ND.basereachable; 1672 if (ND.basereachable != obasereachable) 1673 ext->nd_reachable = 1674 ND_COMPUTE_RTIME(ND.basereachable); 1675 } 1676 if (ND.retrans != 0) 1677 ext->nd_retrans = ND.retrans; 1678 if (ND.chlim != 0) 1679 ext->nd_curhoplimit = ND.chlim; 1680 /* FALLTHROUGH */ 1681 case SIOCSIFINFO_FLAGS: 1682 { 1683 struct ifaddr *ifa; 1684 struct in6_ifaddr *ia; 1685 1686 if ((ext->nd_flags & ND6_IFF_IFDISABLED) && 1687 !(ND.flags & ND6_IFF_IFDISABLED)) { 1688 /* ifdisabled 1->0 transision */ 1689 1690 /* 1691 * If the interface is marked as ND6_IFF_IFDISABLED and 1692 * has an link-local address with IN6_IFF_DUPLICATED, 1693 * do not clear ND6_IFF_IFDISABLED. 1694 * See RFC 4862, Section 5.4.5. 1695 */ 1696 NET_EPOCH_ENTER(et); 1697 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1698 if (ifa->ifa_addr->sa_family != AF_INET6) 1699 continue; 1700 ia = (struct in6_ifaddr *)ifa; 1701 if ((ia->ia6_flags & IN6_IFF_DUPLICATED) && 1702 IN6_IS_ADDR_LINKLOCAL(IA6_IN6(ia))) 1703 break; 1704 } 1705 NET_EPOCH_EXIT(et); 1706 1707 if (ifa != NULL) { 1708 /* LLA is duplicated. */ 1709 ND.flags |= ND6_IFF_IFDISABLED; 1710 log(LOG_ERR, "Cannot enable an interface" 1711 " with a link-local address marked" 1712 " duplicate.\n"); 1713 } else { 1714 ext->nd_flags &= ~ND6_IFF_IFDISABLED; 1715 if (ifp->if_flags & IFF_UP) 1716 in6_if_up(ifp); 1717 } 1718 } else if (!(ext->nd_flags & ND6_IFF_IFDISABLED) && 1719 (ND.flags & ND6_IFF_IFDISABLED)) { 1720 /* ifdisabled 0->1 transision */ 1721 /* Mark all IPv6 address as tentative. */ 1722 1723 ext->nd_flags |= ND6_IFF_IFDISABLED; 1724 if (V_ip6_dad_count > 0 && 1725 (ext->nd_flags & ND6_IFF_NO_DAD) == 0) { 1726 NET_EPOCH_ENTER(et); 1727 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, 1728 ifa_link) { 1729 if (ifa->ifa_addr->sa_family != 1730 AF_INET6) 1731 continue; 1732 ia = (struct in6_ifaddr *)ifa; 1733 ia->ia6_flags |= IN6_IFF_TENTATIVE; 1734 } 1735 NET_EPOCH_EXIT(et); 1736 } 1737 } 1738 1739 if (ND.flags & ND6_IFF_AUTO_LINKLOCAL) { 1740 if (!(ext->nd_flags & ND6_IFF_AUTO_LINKLOCAL)) { 1741 /* auto_linklocal 0->1 transision */ 1742 1743 /* If no link-local address on ifp, configure */ 1744 ext->nd_flags |= ND6_IFF_AUTO_LINKLOCAL; 1745 in6_ifattach(ifp, NULL); 1746 } else if (!(ND.flags & ND6_IFF_IFDISABLED) && 1747 ifp->if_flags & IFF_UP) { 1748 /* 1749 * When the IF already has 1750 * ND6_IFF_AUTO_LINKLOCAL, no link-local 1751 * address is assigned, and IFF_UP, try to 1752 * assign one. 1753 */ 1754 NET_EPOCH_ENTER(et); 1755 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, 1756 ifa_link) { 1757 if (ifa->ifa_addr->sa_family != 1758 AF_INET6) 1759 continue; 1760 ia = (struct in6_ifaddr *)ifa; 1761 if (IN6_IS_ADDR_LINKLOCAL(IA6_IN6(ia))) 1762 break; 1763 } 1764 NET_EPOCH_EXIT(et); 1765 if (ifa != NULL) 1766 /* No LLA is configured. */ 1767 in6_ifattach(ifp, NULL); 1768 } 1769 } 1770 ext->nd_flags = ND.flags; 1771 break; 1772 } 1773 #undef ND 1774 case SIOCSNDFLUSH_IN6: /* XXX: the ioctl name is confusing... */ 1775 /* sync kernel routing table with the default router list */ 1776 defrouter_reset(); 1777 defrouter_select_fib(RT_ALL_FIBS); 1778 break; 1779 case SIOCSPFXFLUSH_IN6: 1780 { 1781 /* flush all the prefix advertised by routers */ 1782 struct in6_ifaddr *ia, *ia_next; 1783 struct nd_prefix *pr, *next; 1784 struct nd_prhead prl; 1785 1786 LIST_INIT(&prl); 1787 1788 ND6_WLOCK(); 1789 LIST_FOREACH_SAFE(pr, &V_nd_prefix, ndpr_entry, next) { 1790 if (ND6_PREFIX_WITH_ROUTER(pr)) 1791 nd6_prefix_unlink(pr, &prl); 1792 } 1793 ND6_WUNLOCK(); 1794 1795 while ((pr = LIST_FIRST(&prl)) != NULL) { 1796 LIST_REMOVE(pr, ndpr_entry); 1797 /* XXXRW: in6_ifaddrhead locking. */ 1798 CK_STAILQ_FOREACH_SAFE(ia, &V_in6_ifaddrhead, ia_link, 1799 ia_next) { 1800 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) == 0) 1801 continue; 1802 1803 if (ia->ia6_ndpr == pr) 1804 in6_purgeaddr(&ia->ia_ifa); 1805 } 1806 nd6_prefix_del(pr); 1807 } 1808 break; 1809 } 1810 case SIOCSRTRFLUSH_IN6: 1811 { 1812 /* flush all the default routers */ 1813 1814 defrouter_reset(); 1815 nd6_defrouter_flush_all(); 1816 defrouter_select_fib(RT_ALL_FIBS); 1817 break; 1818 } 1819 case SIOCGNBRINFO_IN6: 1820 { 1821 struct llentry *ln; 1822 struct in6_addr nb_addr = nbi->addr; /* make local for safety */ 1823 1824 if ((error = in6_setscope(&nb_addr, ifp, NULL)) != 0) 1825 return (error); 1826 1827 NET_EPOCH_ENTER(et); 1828 ln = nd6_lookup(&nb_addr, LLE_SF(AF_INET6, 0), ifp); 1829 NET_EPOCH_EXIT(et); 1830 1831 if (ln == NULL) { 1832 error = EINVAL; 1833 break; 1834 } 1835 nbi->state = ln->ln_state; 1836 nbi->asked = ln->la_asked; 1837 nbi->isrouter = ln->ln_router; 1838 if (ln->la_expire == 0) 1839 nbi->expire = 0; 1840 else 1841 nbi->expire = ln->la_expire + ln->lle_remtime / hz + 1842 (time_second - time_uptime); 1843 LLE_RUNLOCK(ln); 1844 break; 1845 } 1846 case SIOCGDEFIFACE_IN6: /* XXX: should be implemented as a sysctl? */ 1847 ndif->ifindex = V_nd6_defifindex; 1848 break; 1849 case SIOCSDEFIFACE_IN6: /* XXX: should be implemented as a sysctl? */ 1850 return (nd6_setdefaultiface(ndif->ifindex)); 1851 } 1852 return (error); 1853 } 1854 1855 /* 1856 * Calculates new isRouter value based on provided parameters and 1857 * returns it. 1858 */ 1859 static int 1860 nd6_is_router(int type, int code, int is_new, int old_addr, int new_addr, 1861 int ln_router) 1862 { 1863 1864 /* 1865 * ICMP6 type dependent behavior. 1866 * 1867 * NS: clear IsRouter if new entry 1868 * RS: clear IsRouter 1869 * RA: set IsRouter if there's lladdr 1870 * redir: clear IsRouter if new entry 1871 * 1872 * RA case, (1): 1873 * The spec says that we must set IsRouter in the following cases: 1874 * - If lladdr exist, set IsRouter. This means (1-5). 1875 * - If it is old entry (!newentry), set IsRouter. This means (7). 1876 * So, based on the spec, in (1-5) and (7) cases we must set IsRouter. 1877 * A quetion arises for (1) case. (1) case has no lladdr in the 1878 * neighbor cache, this is similar to (6). 1879 * This case is rare but we figured that we MUST NOT set IsRouter. 1880 * 1881 * is_new old_addr new_addr NS RS RA redir 1882 * D R 1883 * 0 n n (1) c ? s 1884 * 0 y n (2) c s s 1885 * 0 n y (3) c s s 1886 * 0 y y (4) c s s 1887 * 0 y y (5) c s s 1888 * 1 -- n (6) c c c s 1889 * 1 -- y (7) c c s c s 1890 * 1891 * (c=clear s=set) 1892 */ 1893 switch (type & 0xff) { 1894 case ND_NEIGHBOR_SOLICIT: 1895 /* 1896 * New entry must have is_router flag cleared. 1897 */ 1898 if (is_new) /* (6-7) */ 1899 ln_router = 0; 1900 break; 1901 case ND_REDIRECT: 1902 /* 1903 * If the icmp is a redirect to a better router, always set the 1904 * is_router flag. Otherwise, if the entry is newly created, 1905 * clear the flag. [RFC 2461, sec 8.3] 1906 */ 1907 if (code == ND_REDIRECT_ROUTER) 1908 ln_router = 1; 1909 else { 1910 if (is_new) /* (6-7) */ 1911 ln_router = 0; 1912 } 1913 break; 1914 case ND_ROUTER_SOLICIT: 1915 /* 1916 * is_router flag must always be cleared. 1917 */ 1918 ln_router = 0; 1919 break; 1920 case ND_ROUTER_ADVERT: 1921 /* 1922 * Mark an entry with lladdr as a router. 1923 */ 1924 if ((!is_new && (old_addr || new_addr)) || /* (2-5) */ 1925 (is_new && new_addr)) { /* (7) */ 1926 ln_router = 1; 1927 } 1928 break; 1929 } 1930 1931 return (ln_router); 1932 } 1933 1934 /* 1935 * Create neighbor cache entry and cache link-layer address, 1936 * on reception of inbound ND6 packets. (RS/RA/NS/redirect) 1937 * 1938 * type - ICMP6 type 1939 * code - type dependent information 1940 * 1941 */ 1942 void 1943 nd6_cache_lladdr(struct ifnet *ifp, struct in6_addr *from, char *lladdr, 1944 int lladdrlen, int type, int code) 1945 { 1946 struct llentry *ln = NULL, *ln_tmp; 1947 int is_newentry; 1948 int do_update; 1949 int olladdr; 1950 int llchange; 1951 int flags; 1952 uint16_t router = 0; 1953 struct mbuf *chain = NULL; 1954 u_char linkhdr[LLE_MAX_LINKHDR]; 1955 size_t linkhdrsize; 1956 int lladdr_off; 1957 1958 NET_EPOCH_ASSERT(); 1959 1960 KASSERT(ifp != NULL, ("%s: ifp == NULL", __func__)); 1961 KASSERT(from != NULL, ("%s: from == NULL", __func__)); 1962 1963 /* nothing must be updated for unspecified address */ 1964 if (IN6_IS_ADDR_UNSPECIFIED(from)) 1965 return; 1966 1967 /* 1968 * Validation about ifp->if_addrlen and lladdrlen must be done in 1969 * the caller. 1970 * 1971 * XXX If the link does not have link-layer adderss, what should 1972 * we do? (ifp->if_addrlen == 0) 1973 * Spec says nothing in sections for RA, RS and NA. There's small 1974 * description on it in NS section (RFC 2461 7.2.3). 1975 */ 1976 flags = lladdr ? LLE_EXCLUSIVE : 0; 1977 ln = nd6_lookup(from, LLE_SF(AF_INET6, flags), ifp); 1978 is_newentry = 0; 1979 if (ln == NULL) { 1980 flags |= LLE_EXCLUSIVE; 1981 ln = nd6_alloc(from, 0, ifp); 1982 if (ln == NULL) 1983 return; 1984 1985 /* 1986 * Since we already know all the data for the new entry, 1987 * fill it before insertion. 1988 */ 1989 if (lladdr != NULL) { 1990 linkhdrsize = sizeof(linkhdr); 1991 if (lltable_calc_llheader(ifp, AF_INET6, lladdr, 1992 linkhdr, &linkhdrsize, &lladdr_off) != 0) { 1993 lltable_free_entry(LLTABLE6(ifp), ln); 1994 return; 1995 } 1996 lltable_set_entry_addr(ifp, ln, linkhdr, linkhdrsize, 1997 lladdr_off); 1998 } 1999 2000 LLTABLE_LOCK(LLTABLE6(ifp)); 2001 LLE_WLOCK(ln); 2002 /* Prefer any existing lle over newly-created one */ 2003 ln_tmp = nd6_lookup(from, LLE_SF(AF_INET6, LLE_EXCLUSIVE), ifp); 2004 if (ln_tmp == NULL) 2005 lltable_link_entry(LLTABLE6(ifp), ln); 2006 LLTABLE_UNLOCK(LLTABLE6(ifp)); 2007 if (ln_tmp == NULL) { 2008 /* No existing lle, mark as new entry (6,7) */ 2009 is_newentry = 1; 2010 if (lladdr != NULL) { /* (7) */ 2011 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE); 2012 EVENTHANDLER_INVOKE(lle_event, ln, 2013 LLENTRY_RESOLVED); 2014 } 2015 } else { 2016 lltable_free_entry(LLTABLE6(ifp), ln); 2017 ln = ln_tmp; 2018 ln_tmp = NULL; 2019 } 2020 } 2021 /* do nothing if static ndp is set */ 2022 if ((ln->la_flags & LLE_STATIC)) { 2023 if (flags & LLE_EXCLUSIVE) 2024 LLE_WUNLOCK(ln); 2025 else 2026 LLE_RUNLOCK(ln); 2027 return; 2028 } 2029 2030 olladdr = (ln->la_flags & LLE_VALID) ? 1 : 0; 2031 if (olladdr && lladdr) { 2032 llchange = bcmp(lladdr, ln->ll_addr, 2033 ifp->if_addrlen); 2034 } else if (!olladdr && lladdr) 2035 llchange = 1; 2036 else 2037 llchange = 0; 2038 2039 /* 2040 * newentry olladdr lladdr llchange (*=record) 2041 * 0 n n -- (1) 2042 * 0 y n -- (2) 2043 * 0 n y y (3) * STALE 2044 * 0 y y n (4) * 2045 * 0 y y y (5) * STALE 2046 * 1 -- n -- (6) NOSTATE(= PASSIVE) 2047 * 1 -- y -- (7) * STALE 2048 */ 2049 2050 do_update = 0; 2051 if (is_newentry == 0 && llchange != 0) { 2052 do_update = 1; /* (3,5) */ 2053 2054 /* 2055 * Record source link-layer address 2056 * XXX is it dependent to ifp->if_type? 2057 */ 2058 if (!nd6_try_set_entry_addr(ifp, ln, lladdr)) { 2059 /* Entry was deleted */ 2060 LLE_WUNLOCK(ln); 2061 return; 2062 } 2063 2064 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE); 2065 2066 EVENTHANDLER_INVOKE(lle_event, ln, LLENTRY_RESOLVED); 2067 2068 if (ln->la_hold != NULL) 2069 chain = nd6_grab_holdchain(ln); 2070 } 2071 2072 /* Calculates new router status */ 2073 router = nd6_is_router(type, code, is_newentry, olladdr, 2074 lladdr != NULL ? 1 : 0, ln->ln_router); 2075 2076 ln->ln_router = router; 2077 /* Mark non-router redirects with special flag */ 2078 if ((type & 0xFF) == ND_REDIRECT && code != ND_REDIRECT_ROUTER) 2079 ln->la_flags |= LLE_REDIRECT; 2080 2081 if (flags & LLE_EXCLUSIVE) 2082 LLE_WUNLOCK(ln); 2083 else 2084 LLE_RUNLOCK(ln); 2085 2086 if (chain != NULL) 2087 nd6_flush_holdchain(ifp, ln, chain); 2088 if (do_update) 2089 nd6_flush_children_holdchain(ifp, ln); 2090 2091 /* 2092 * When the link-layer address of a router changes, select the 2093 * best router again. In particular, when the neighbor entry is newly 2094 * created, it might affect the selection policy. 2095 * Question: can we restrict the first condition to the "is_newentry" 2096 * case? 2097 * XXX: when we hear an RA from a new router with the link-layer 2098 * address option, defrouter_select_fib() is called twice, since 2099 * defrtrlist_update called the function as well. However, I believe 2100 * we can compromise the overhead, since it only happens the first 2101 * time. 2102 * XXX: although defrouter_select_fib() should not have a bad effect 2103 * for those are not autoconfigured hosts, we explicitly avoid such 2104 * cases for safety. 2105 */ 2106 if ((do_update || is_newentry) && router && 2107 ifp->if_inet6->nd_flags & ND6_IFF_ACCEPT_RTADV) { 2108 /* 2109 * guaranteed recursion 2110 */ 2111 defrouter_select_fib(ifp->if_fib); 2112 } 2113 } 2114 2115 static void 2116 nd6_slowtimo(void *arg) 2117 { 2118 struct epoch_tracker et; 2119 CURVNET_SET((struct vnet *) arg); 2120 struct in6_ifextra *nd6if; 2121 struct ifnet *ifp; 2122 2123 callout_reset(&V_nd6_slowtimo_ch, ND6_SLOWTIMER_INTERVAL * hz, 2124 nd6_slowtimo, curvnet); 2125 NET_EPOCH_ENTER(et); 2126 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 2127 if ((nd6if = ifp->if_inet6) == NULL) 2128 continue; 2129 if (nd6if->nd_basereachable && /* already initialized */ 2130 (nd6if->nd_recalc_timer -= ND6_SLOWTIMER_INTERVAL) <= 0) { 2131 /* 2132 * Since reachable time rarely changes by router 2133 * advertisements, we SHOULD insure that a new random 2134 * value gets recomputed at least once every few hours. 2135 * (RFC 2461, 6.3.4) 2136 */ 2137 nd6if->nd_recalc_timer = V_nd6_recalc_reachtm_interval; 2138 nd6if->nd_reachable = 2139 ND_COMPUTE_RTIME(nd6if->nd_basereachable); 2140 } 2141 } 2142 NET_EPOCH_EXIT(et); 2143 CURVNET_RESTORE(); 2144 } 2145 2146 struct mbuf * 2147 nd6_grab_holdchain(struct llentry *ln) 2148 { 2149 struct mbuf *chain; 2150 2151 LLE_WLOCK_ASSERT(ln); 2152 2153 chain = ln->la_hold; 2154 ln->la_hold = NULL; 2155 ln->la_numheld = 0; 2156 2157 if (ln->ln_state == ND6_LLINFO_STALE) { 2158 /* 2159 * The first time we send a packet to a 2160 * neighbor whose entry is STALE, we have 2161 * to change the state to DELAY and a sets 2162 * a timer to expire in DELAY_FIRST_PROBE_TIME 2163 * seconds to ensure do neighbor unreachability 2164 * detection on expiration. 2165 * (RFC 2461 7.3.3) 2166 */ 2167 nd6_llinfo_setstate(ln, ND6_LLINFO_DELAY); 2168 } 2169 2170 return (chain); 2171 } 2172 2173 int 2174 nd6_output_ifp(struct ifnet *ifp, struct ifnet *origifp, struct mbuf *m, 2175 struct sockaddr_in6 *dst, struct route *ro) 2176 { 2177 int error; 2178 int ip6len; 2179 struct ip6_hdr *ip6; 2180 struct m_tag *mtag; 2181 2182 #ifdef MAC 2183 mac_netinet6_nd6_send(ifp, m); 2184 #endif 2185 2186 /* 2187 * If called from nd6_ns_output() (NS), nd6_na_output() (NA), 2188 * icmp6_redirect_output() (REDIRECT) or from rip6_output() (RS, RA 2189 * as handled by rtsol and rtadvd), mbufs will be tagged for SeND 2190 * to be diverted to user space. When re-injected into the kernel, 2191 * send_output() will directly dispatch them to the outgoing interface. 2192 */ 2193 if (send_sendso_input_hook != NULL) { 2194 mtag = m_tag_find(m, PACKET_TAG_ND_OUTGOING, NULL); 2195 if (mtag != NULL) { 2196 ip6 = mtod(m, struct ip6_hdr *); 2197 ip6len = sizeof(struct ip6_hdr) + ntohs(ip6->ip6_plen); 2198 /* Use the SEND socket */ 2199 error = send_sendso_input_hook(m, ifp, SND_OUT, 2200 ip6len); 2201 /* -1 == no app on SEND socket */ 2202 if (error == 0 || error != -1) 2203 return (error); 2204 } 2205 } 2206 2207 m_clrprotoflags(m); /* Avoid confusing lower layers. */ 2208 IP_PROBE(send, NULL, NULL, mtod(m, struct ip6_hdr *), ifp, NULL, 2209 mtod(m, struct ip6_hdr *)); 2210 2211 if ((ifp->if_flags & IFF_LOOPBACK) == 0) 2212 origifp = ifp; 2213 2214 error = (*ifp->if_output)(origifp, m, (struct sockaddr *)dst, ro); 2215 return (error); 2216 } 2217 2218 /* 2219 * Lookup link headerfor @sa_dst address. Stores found 2220 * data in @desten buffer. Copy of lle ln_flags can be also 2221 * saved in @pflags if @pflags is non-NULL. 2222 * 2223 * If destination LLE does not exists or lle state modification 2224 * is required, call "slow" version. 2225 * 2226 * Return values: 2227 * - 0 on success (address copied to buffer). 2228 * - EWOULDBLOCK (no local error, but address is still unresolved) 2229 * - other errors (alloc failure, etc) 2230 */ 2231 int 2232 nd6_resolve(struct ifnet *ifp, int gw_flags, struct mbuf *m, 2233 const struct sockaddr *sa_dst, u_char *desten, uint32_t *pflags, 2234 struct llentry **plle) 2235 { 2236 struct llentry *ln = NULL; 2237 const struct sockaddr_in6 *dst6; 2238 2239 NET_EPOCH_ASSERT(); 2240 2241 if (pflags != NULL) 2242 *pflags = 0; 2243 2244 dst6 = (const struct sockaddr_in6 *)sa_dst; 2245 2246 /* discard the packet if IPv6 operation is disabled on the interface */ 2247 if ((ifp->if_inet6->nd_flags & ND6_IFF_IFDISABLED)) { 2248 m_freem(m); 2249 return (ENETDOWN); /* better error? */ 2250 } 2251 2252 if (m != NULL && m->m_flags & M_MCAST) { 2253 switch (ifp->if_type) { 2254 case IFT_ETHER: 2255 case IFT_L2VLAN: 2256 case IFT_BRIDGE: 2257 ETHER_MAP_IPV6_MULTICAST(&dst6->sin6_addr, 2258 desten); 2259 return (0); 2260 default: 2261 m_freem(m); 2262 return (EAFNOSUPPORT); 2263 } 2264 } 2265 2266 int family = gw_flags >> 16; 2267 int lookup_flags = plle ? LLE_EXCLUSIVE : LLE_UNLOCKED; 2268 ln = nd6_lookup(&dst6->sin6_addr, LLE_SF(family, lookup_flags), ifp); 2269 if (ln != NULL && (ln->r_flags & RLLE_VALID) != 0) { 2270 /* Entry found, let's copy lle info */ 2271 bcopy(ln->r_linkdata, desten, ln->r_hdrlen); 2272 if (pflags != NULL) 2273 *pflags = LLE_VALID | (ln->r_flags & RLLE_IFADDR); 2274 llentry_provide_feedback(ln); 2275 if (plle) { 2276 LLE_ADDREF(ln); 2277 *plle = ln; 2278 LLE_WUNLOCK(ln); 2279 } 2280 return (0); 2281 } else if (plle && ln) 2282 LLE_WUNLOCK(ln); 2283 2284 return (nd6_resolve_slow(ifp, family, 0, m, dst6, desten, pflags, plle)); 2285 } 2286 2287 /* 2288 * Finds or creates a new llentry for @addr and @family. 2289 * Returns wlocked llentry or NULL. 2290 * 2291 * 2292 * Child LLEs. 2293 * 2294 * Do not have their own state machine (gets marked as static) 2295 * settimer bails out for child LLEs just in case. 2296 * 2297 * Locking order: parent lle gets locked first, chen goes the child. 2298 */ 2299 static __noinline struct llentry * 2300 nd6_get_llentry(struct ifnet *ifp, const struct in6_addr *addr, int family) 2301 { 2302 struct llentry *child_lle = NULL; 2303 struct llentry *lle, *lle_tmp; 2304 2305 lle = nd6_alloc(addr, 0, ifp); 2306 if (lle != NULL && family != AF_INET6) { 2307 child_lle = nd6_alloc(addr, 0, ifp); 2308 if (child_lle == NULL) { 2309 lltable_free_entry(LLTABLE6(ifp), lle); 2310 return (NULL); 2311 } 2312 child_lle->r_family = family; 2313 child_lle->la_flags |= LLE_CHILD | LLE_STATIC; 2314 child_lle->ln_state = ND6_LLINFO_INCOMPLETE; 2315 } 2316 2317 if (lle == NULL) { 2318 char ip6buf[INET6_ADDRSTRLEN]; 2319 log(LOG_DEBUG, 2320 "nd6_get_llentry: can't allocate llinfo for %s " 2321 "(ln=%p)\n", 2322 ip6_sprintf(ip6buf, addr), lle); 2323 return (NULL); 2324 } 2325 2326 LLTABLE_LOCK(LLTABLE6(ifp)); 2327 LLE_WLOCK(lle); 2328 /* Prefer any existing entry over newly-created one */ 2329 lle_tmp = nd6_lookup(addr, LLE_SF(AF_INET6, LLE_EXCLUSIVE), ifp); 2330 if (lle_tmp == NULL) 2331 lltable_link_entry(LLTABLE6(ifp), lle); 2332 else { 2333 lltable_free_entry(LLTABLE6(ifp), lle); 2334 lle = lle_tmp; 2335 } 2336 if (child_lle != NULL) { 2337 /* Check if child lle for the same family exists */ 2338 lle_tmp = llentry_lookup_family(lle, child_lle->r_family); 2339 LLE_WLOCK(child_lle); 2340 if (lle_tmp == NULL) { 2341 /* Attach */ 2342 lltable_link_child_entry(lle, child_lle); 2343 } else { 2344 /* child lle already exists, free newly-created one */ 2345 lltable_free_entry(LLTABLE6(ifp), child_lle); 2346 LLE_WLOCK(lle_tmp); 2347 child_lle = lle_tmp; 2348 } 2349 LLE_WUNLOCK(lle); 2350 lle = child_lle; 2351 } 2352 LLTABLE_UNLOCK(LLTABLE6(ifp)); 2353 return (lle); 2354 } 2355 2356 /* 2357 * Do L2 address resolution for @sa_dst address. Stores found 2358 * address in @desten buffer. Copy of lle ln_flags can be also 2359 * saved in @pflags if @pflags is non-NULL. 2360 * 2361 * Heavy version. 2362 * Function assume that destination LLE does not exist, 2363 * is invalid or stale, so LLE_EXCLUSIVE lock needs to be acquired. 2364 * 2365 * Set noinline to be dtrace-friendly 2366 */ 2367 static __noinline int 2368 nd6_resolve_slow(struct ifnet *ifp, int family, int flags, struct mbuf *m, 2369 const struct sockaddr_in6 *dst, u_char *desten, uint32_t *pflags, 2370 struct llentry **plle) 2371 { 2372 struct llentry *lle = NULL; 2373 struct in6_addr *psrc, src; 2374 int send_ns, ll_len; 2375 char *lladdr; 2376 2377 NET_EPOCH_ASSERT(); 2378 2379 /* 2380 * Address resolution or Neighbor Unreachability Detection 2381 * for the next hop. 2382 * At this point, the destination of the packet must be a unicast 2383 * or an anycast address(i.e. not a multicast). 2384 */ 2385 lle = nd6_lookup(&dst->sin6_addr, LLE_SF(family, LLE_EXCLUSIVE), ifp); 2386 if ((lle == NULL) && nd6_is_addr_neighbor(dst, ifp)) { 2387 /* 2388 * Since nd6_is_addr_neighbor() internally calls nd6_lookup(), 2389 * the condition below is not very efficient. But we believe 2390 * it is tolerable, because this should be a rare case. 2391 */ 2392 lle = nd6_get_llentry(ifp, &dst->sin6_addr, family); 2393 } 2394 2395 if (lle == NULL) { 2396 m_freem(m); 2397 return (ENOBUFS); 2398 } 2399 2400 LLE_WLOCK_ASSERT(lle); 2401 2402 /* 2403 * The first time we send a packet to a neighbor whose entry is 2404 * STALE, we have to change the state to DELAY and a sets a timer to 2405 * expire in DELAY_FIRST_PROBE_TIME seconds to ensure do 2406 * neighbor unreachability detection on expiration. 2407 * (RFC 2461 7.3.3) 2408 */ 2409 if ((!(lle->la_flags & LLE_CHILD)) && (lle->ln_state == ND6_LLINFO_STALE)) 2410 nd6_llinfo_setstate(lle, ND6_LLINFO_DELAY); 2411 2412 /* 2413 * If the neighbor cache entry has a state other than INCOMPLETE 2414 * (i.e. its link-layer address is already resolved), just 2415 * send the packet. 2416 */ 2417 if (lle->ln_state > ND6_LLINFO_INCOMPLETE) { 2418 if (flags & LLE_ADDRONLY) { 2419 lladdr = lle->ll_addr; 2420 ll_len = ifp->if_addrlen; 2421 } else { 2422 lladdr = lle->r_linkdata; 2423 ll_len = lle->r_hdrlen; 2424 } 2425 bcopy(lladdr, desten, ll_len); 2426 if (pflags != NULL) 2427 *pflags = lle->la_flags; 2428 if (plle) { 2429 LLE_ADDREF(lle); 2430 *plle = lle; 2431 } 2432 LLE_WUNLOCK(lle); 2433 return (0); 2434 } 2435 2436 /* 2437 * There is a neighbor cache entry, but no ethernet address 2438 * response yet. Append this latest packet to the end of the 2439 * packet queue in the mbuf. When it exceeds nd6_maxqueuelen, 2440 * the oldest packet in the queue will be removed. 2441 */ 2442 if (m != NULL) { 2443 size_t dropped; 2444 2445 dropped = lltable_append_entry_queue(lle, m, V_nd6_maxqueuelen); 2446 ICMP6STAT_ADD(icp6s_dropped, dropped); 2447 } 2448 2449 /* 2450 * If there has been no NS for the neighbor after entering the 2451 * INCOMPLETE state, send the first solicitation. 2452 * Note that for newly-created lle la_asked will be 0, 2453 * so we will transition from ND6_LLINFO_NOSTATE to 2454 * ND6_LLINFO_INCOMPLETE state here. 2455 */ 2456 psrc = NULL; 2457 send_ns = 0; 2458 2459 /* If we have child lle, switch to the parent to send NS */ 2460 if (lle->la_flags & LLE_CHILD) { 2461 struct llentry *lle_parent = lle->lle_parent; 2462 LLE_WUNLOCK(lle); 2463 lle = lle_parent; 2464 LLE_WLOCK(lle); 2465 } 2466 if (lle->la_asked == 0) { 2467 lle->la_asked++; 2468 send_ns = 1; 2469 psrc = nd6_llinfo_get_holdsrc(lle, &src); 2470 2471 nd6_llinfo_setstate(lle, ND6_LLINFO_INCOMPLETE); 2472 } 2473 LLE_WUNLOCK(lle); 2474 if (send_ns != 0) 2475 nd6_ns_output(ifp, psrc, NULL, &dst->sin6_addr, NULL); 2476 2477 return (EWOULDBLOCK); 2478 } 2479 2480 /* 2481 * Do L2 address resolution for @sa_dst address. Stores found 2482 * address in @desten buffer. Copy of lle ln_flags can be also 2483 * saved in @pflags if @pflags is non-NULL. 2484 * 2485 * Return values: 2486 * - 0 on success (address copied to buffer). 2487 * - EWOULDBLOCK (no local error, but address is still unresolved) 2488 * - other errors (alloc failure, etc) 2489 */ 2490 int 2491 nd6_resolve_addr(struct ifnet *ifp, int flags, const struct sockaddr *dst, 2492 char *desten, uint32_t *pflags) 2493 { 2494 int error; 2495 2496 flags |= LLE_ADDRONLY; 2497 error = nd6_resolve_slow(ifp, AF_INET6, flags, NULL, 2498 (const struct sockaddr_in6 *)dst, desten, pflags, NULL); 2499 return (error); 2500 } 2501 2502 int 2503 nd6_flush_holdchain(struct ifnet *ifp, struct llentry *lle, struct mbuf *chain) 2504 { 2505 struct mbuf *m, *m_head; 2506 struct sockaddr_in6 dst6; 2507 int error = 0; 2508 2509 NET_EPOCH_ASSERT(); 2510 2511 struct route_in6 ro = { 2512 .ro_prepend = lle->r_linkdata, 2513 .ro_plen = lle->r_hdrlen, 2514 }; 2515 2516 lltable_fill_sa_entry(lle, (struct sockaddr *)&dst6); 2517 m_head = chain; 2518 2519 while (m_head) { 2520 m = m_head; 2521 m_head = m_head->m_nextpkt; 2522 m->m_nextpkt = NULL; 2523 error = nd6_output_ifp(ifp, ifp, m, &dst6, (struct route *)&ro); 2524 } 2525 2526 /* 2527 * XXX 2528 * note that intermediate errors are blindly ignored 2529 */ 2530 return (error); 2531 } 2532 2533 __noinline void 2534 nd6_flush_children_holdchain(struct ifnet *ifp, struct llentry *lle) 2535 { 2536 struct llentry *child_lle; 2537 struct mbuf *chain; 2538 2539 NET_EPOCH_ASSERT(); 2540 2541 CK_SLIST_FOREACH(child_lle, &lle->lle_children, lle_child_next) { 2542 LLE_WLOCK(child_lle); 2543 chain = nd6_grab_holdchain(child_lle); 2544 LLE_WUNLOCK(child_lle); 2545 nd6_flush_holdchain(ifp, child_lle, chain); 2546 } 2547 } 2548 2549 static int 2550 nd6_need_cache(struct ifnet *ifp) 2551 { 2552 /* 2553 * XXX: we currently do not make neighbor cache on any interface 2554 * other than Ethernet and GIF. 2555 * 2556 * RFC2893 says: 2557 * - unidirectional tunnels needs no ND 2558 */ 2559 switch (ifp->if_type) { 2560 case IFT_ETHER: 2561 case IFT_IEEE1394: 2562 case IFT_L2VLAN: 2563 case IFT_INFINIBAND: 2564 case IFT_BRIDGE: 2565 case IFT_PROPVIRTUAL: 2566 return (1); 2567 default: 2568 return (0); 2569 } 2570 } 2571 2572 /* 2573 * Add pernament ND6 link-layer record for given 2574 * interface address. 2575 * 2576 * Very similar to IPv4 arp_ifinit(), but: 2577 * 1) IPv6 DAD is performed in different place 2578 * 2) It is called by IPv6 protocol stack in contrast to 2579 * arp_ifinit() which is typically called in SIOCSIFADDR 2580 * driver ioctl handler. 2581 * 2582 */ 2583 int 2584 nd6_add_ifa_lle(struct in6_ifaddr *ia) 2585 { 2586 struct ifnet *ifp; 2587 struct llentry *ln, *ln_tmp; 2588 struct sockaddr *dst; 2589 2590 ifp = ia->ia_ifa.ifa_ifp; 2591 if (nd6_need_cache(ifp) == 0) 2592 return (0); 2593 2594 dst = (struct sockaddr *)&ia->ia_addr; 2595 ln = lltable_alloc_entry(LLTABLE6(ifp), LLE_IFADDR, dst); 2596 if (ln == NULL) 2597 return (ENOBUFS); 2598 2599 LLTABLE_LOCK(LLTABLE6(ifp)); 2600 LLE_WLOCK(ln); 2601 /* Unlink any entry if exists */ 2602 ln_tmp = lla_lookup(LLTABLE6(ifp), LLE_SF(AF_INET6, LLE_EXCLUSIVE), dst); 2603 if (ln_tmp != NULL) 2604 lltable_unlink_entry(LLTABLE6(ifp), ln_tmp); 2605 lltable_link_entry(LLTABLE6(ifp), ln); 2606 LLTABLE_UNLOCK(LLTABLE6(ifp)); 2607 2608 if (ln_tmp != NULL) 2609 EVENTHANDLER_INVOKE(lle_event, ln_tmp, LLENTRY_EXPIRED); 2610 EVENTHANDLER_INVOKE(lle_event, ln, LLENTRY_RESOLVED); 2611 2612 LLE_WUNLOCK(ln); 2613 if (ln_tmp != NULL) 2614 llentry_free(ln_tmp); 2615 2616 return (0); 2617 } 2618 2619 /* 2620 * Removes either all lle entries for given @ia, or lle 2621 * corresponding to @ia address. 2622 */ 2623 void 2624 nd6_rem_ifa_lle(struct in6_ifaddr *ia, int all) 2625 { 2626 struct sockaddr_in6 mask, addr; 2627 struct sockaddr *saddr, *smask; 2628 struct ifnet *ifp; 2629 2630 ifp = ia->ia_ifa.ifa_ifp; 2631 memcpy(&addr, &ia->ia_addr, sizeof(ia->ia_addr)); 2632 memcpy(&mask, &ia->ia_prefixmask, sizeof(ia->ia_prefixmask)); 2633 saddr = (struct sockaddr *)&addr; 2634 smask = (struct sockaddr *)&mask; 2635 2636 if (all != 0) 2637 lltable_prefix_free(AF_INET6, saddr, smask, LLE_STATIC); 2638 else 2639 lltable_delete_addr(LLTABLE6(ifp), LLE_IFADDR, saddr); 2640 } 2641 2642 static int 2643 nd6_sysctl_prlist(SYSCTL_HANDLER_ARGS) 2644 { 2645 struct in6_prefix p; 2646 struct sockaddr_in6 s6; 2647 struct nd_prefix *pr; 2648 struct nd_pfxrouter *pfr; 2649 time_t maxexpire; 2650 int error; 2651 char ip6buf[INET6_ADDRSTRLEN]; 2652 2653 if (req->newptr) 2654 return (EPERM); 2655 2656 error = sysctl_wire_old_buffer(req, 0); 2657 if (error != 0) 2658 return (error); 2659 2660 bzero(&p, sizeof(p)); 2661 p.origin = PR_ORIG_RA; 2662 bzero(&s6, sizeof(s6)); 2663 s6.sin6_family = AF_INET6; 2664 s6.sin6_len = sizeof(s6); 2665 2666 ND6_RLOCK(); 2667 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) { 2668 p.prefix = pr->ndpr_prefix; 2669 if (sa6_recoverscope(&p.prefix)) { 2670 log(LOG_ERR, "scope error in prefix list (%s)\n", 2671 ip6_sprintf(ip6buf, &p.prefix.sin6_addr)); 2672 /* XXX: press on... */ 2673 } 2674 p.raflags = pr->ndpr_raf; 2675 p.prefixlen = pr->ndpr_plen; 2676 p.vltime = pr->ndpr_vltime; 2677 p.pltime = pr->ndpr_pltime; 2678 p.if_index = pr->ndpr_ifp->if_index; 2679 if (pr->ndpr_vltime == ND6_INFINITE_LIFETIME) 2680 p.expire = 0; 2681 else { 2682 /* XXX: we assume time_t is signed. */ 2683 maxexpire = (-1) & 2684 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1)); 2685 if (pr->ndpr_vltime < maxexpire - pr->ndpr_lastupdate) 2686 p.expire = pr->ndpr_lastupdate + 2687 pr->ndpr_vltime + 2688 (time_second - time_uptime); 2689 else 2690 p.expire = maxexpire; 2691 } 2692 p.refcnt = pr->ndpr_addrcnt; 2693 p.flags = pr->ndpr_stateflags; 2694 p.advrtrs = 0; 2695 LIST_FOREACH(pfr, &pr->ndpr_advrtrs, pfr_entry) 2696 p.advrtrs++; 2697 error = SYSCTL_OUT(req, &p, sizeof(p)); 2698 if (error != 0) 2699 break; 2700 LIST_FOREACH(pfr, &pr->ndpr_advrtrs, pfr_entry) { 2701 s6.sin6_addr = pfr->router->rtaddr; 2702 if (sa6_recoverscope(&s6)) 2703 log(LOG_ERR, 2704 "scope error in prefix list (%s)\n", 2705 ip6_sprintf(ip6buf, &pfr->router->rtaddr)); 2706 error = SYSCTL_OUT(req, &s6, sizeof(s6)); 2707 if (error != 0) 2708 goto out; 2709 } 2710 } 2711 out: 2712 ND6_RUNLOCK(); 2713 return (error); 2714 } 2715 SYSCTL_PROC(_net_inet6_icmp6, ICMPV6CTL_ND6_PRLIST, nd6_prlist, 2716 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE, 2717 NULL, 0, nd6_sysctl_prlist, "S,in6_prefix", 2718 "NDP prefix list"); 2719 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_MAXQLEN, nd6_maxqueuelen, 2720 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_maxqueuelen), 1, ""); 2721 SYSCTL_INT(_net_inet6_icmp6, OID_AUTO, nd6_gctimer, 2722 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_gctimer), (60 * 60 * 24), ""); 2723