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_rtr.c,v 1.111 2001/04/27 01:37:15 jinmei Exp $ 32 */ 33 34 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD$"); 36 37 #include "opt_inet.h" 38 #include "opt_inet6.h" 39 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/malloc.h> 43 #include <sys/mbuf.h> 44 #include <sys/refcount.h> 45 #include <sys/socket.h> 46 #include <sys/sockio.h> 47 #include <sys/time.h> 48 #include <sys/kernel.h> 49 #include <sys/lock.h> 50 #include <sys/errno.h> 51 #include <sys/rmlock.h> 52 #include <sys/rwlock.h> 53 #include <sys/sysctl.h> 54 #include <sys/syslog.h> 55 #include <sys/queue.h> 56 57 #include <net/if.h> 58 #include <net/if_var.h> 59 #include <net/if_types.h> 60 #include <net/if_dl.h> 61 #include <net/route.h> 62 #include <net/route/nhop.h> 63 #include <net/route_var.h> 64 #include <net/radix.h> 65 #include <net/vnet.h> 66 67 #include <netinet/in.h> 68 #include <net/if_llatbl.h> 69 #include <netinet6/in6_var.h> 70 #include <netinet6/in6_ifattach.h> 71 #include <netinet/ip6.h> 72 #include <netinet6/ip6_var.h> 73 #include <netinet6/nd6.h> 74 #include <netinet/icmp6.h> 75 #include <netinet6/scope6_var.h> 76 77 static struct nd_defrouter *defrtrlist_update(struct nd_defrouter *); 78 static int prelist_update(struct nd_prefixctl *, struct nd_defrouter *, 79 struct mbuf *, int); 80 static int nd6_prefix_onlink(struct nd_prefix *); 81 82 TAILQ_HEAD(nd6_drhead, nd_defrouter); 83 VNET_DEFINE_STATIC(struct nd6_drhead, nd6_defrouter); 84 #define V_nd6_defrouter VNET(nd6_defrouter) 85 86 VNET_DECLARE(int, nd6_recalc_reachtm_interval); 87 #define V_nd6_recalc_reachtm_interval VNET(nd6_recalc_reachtm_interval) 88 89 VNET_DEFINE_STATIC(struct ifnet *, nd6_defifp); 90 VNET_DEFINE(int, nd6_defifindex); 91 #define V_nd6_defifp VNET(nd6_defifp) 92 93 VNET_DEFINE(int, ip6_use_tempaddr) = 0; 94 95 VNET_DEFINE(int, ip6_desync_factor); 96 VNET_DEFINE(u_int32_t, ip6_temp_preferred_lifetime) = DEF_TEMP_PREFERRED_LIFETIME; 97 VNET_DEFINE(u_int32_t, ip6_temp_valid_lifetime) = DEF_TEMP_VALID_LIFETIME; 98 99 VNET_DEFINE(int, ip6_temp_regen_advance) = TEMPADDR_REGEN_ADVANCE; 100 101 #ifdef EXPERIMENTAL 102 VNET_DEFINE(int, nd6_ignore_ipv6_only_ra) = 1; 103 #endif 104 105 SYSCTL_DECL(_net_inet6_icmp6); 106 107 /* RTPREF_MEDIUM has to be 0! */ 108 #define RTPREF_HIGH 1 109 #define RTPREF_MEDIUM 0 110 #define RTPREF_LOW (-1) 111 #define RTPREF_RESERVED (-2) 112 #define RTPREF_INVALID (-3) /* internal */ 113 114 static void 115 defrouter_ref(struct nd_defrouter *dr) 116 { 117 118 refcount_acquire(&dr->refcnt); 119 } 120 121 void 122 defrouter_rele(struct nd_defrouter *dr) 123 { 124 125 if (refcount_release(&dr->refcnt)) 126 free(dr, M_IP6NDP); 127 } 128 129 /* 130 * Remove a router from the global list and optionally stash it in a 131 * caller-supplied queue. 132 */ 133 static void 134 defrouter_unlink(struct nd_defrouter *dr, struct nd6_drhead *drq) 135 { 136 137 ND6_WLOCK_ASSERT(); 138 139 TAILQ_REMOVE(&V_nd6_defrouter, dr, dr_entry); 140 V_nd6_list_genid++; 141 if (drq != NULL) 142 TAILQ_INSERT_TAIL(drq, dr, dr_entry); 143 } 144 145 /* 146 * Receive Router Solicitation Message - just for routers. 147 * Router solicitation/advertisement is mostly managed by userland program 148 * (rtadvd) so here we have no function like nd6_ra_output(). 149 * 150 * Based on RFC 2461 151 */ 152 void 153 nd6_rs_input(struct mbuf *m, int off, int icmp6len) 154 { 155 struct ifnet *ifp; 156 struct ip6_hdr *ip6; 157 struct nd_router_solicit *nd_rs; 158 struct in6_addr saddr6; 159 union nd_opts ndopts; 160 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 161 char *lladdr; 162 int lladdrlen; 163 164 ifp = m->m_pkthdr.rcvif; 165 166 /* 167 * Accept RS only when V_ip6_forwarding=1 and the interface has 168 * no ND6_IFF_ACCEPT_RTADV. 169 */ 170 if (!V_ip6_forwarding || ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV) 171 goto freeit; 172 173 /* RFC 6980: Nodes MUST silently ignore fragments */ 174 if(m->m_flags & M_FRAGMENTED) 175 goto freeit; 176 177 /* Sanity checks */ 178 ip6 = mtod(m, struct ip6_hdr *); 179 if (ip6->ip6_hlim != 255) { 180 nd6log((LOG_ERR, 181 "%s: invalid hlim (%d) from %s to %s on %s\n", __func__, 182 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src), 183 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp))); 184 goto bad; 185 } 186 187 /* 188 * Don't update the neighbor cache, if src = ::. 189 * This indicates that the src has no IP address assigned yet. 190 */ 191 saddr6 = ip6->ip6_src; 192 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) 193 goto freeit; 194 195 if (m->m_len < off + icmp6len) { 196 m = m_pullup(m, off + icmp6len); 197 if (m == NULL) { 198 IP6STAT_INC(ip6s_exthdrtoolong); 199 return; 200 } 201 } 202 ip6 = mtod(m, struct ip6_hdr *); 203 nd_rs = (struct nd_router_solicit *)((caddr_t)ip6 + off); 204 205 icmp6len -= sizeof(*nd_rs); 206 nd6_option_init(nd_rs + 1, icmp6len, &ndopts); 207 if (nd6_options(&ndopts) < 0) { 208 nd6log((LOG_INFO, 209 "%s: invalid ND option, ignored\n", __func__)); 210 /* nd6_options have incremented stats */ 211 goto freeit; 212 } 213 214 lladdr = NULL; 215 lladdrlen = 0; 216 if (ndopts.nd_opts_src_lladdr) { 217 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1); 218 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3; 219 } 220 221 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 222 nd6log((LOG_INFO, 223 "%s: lladdrlen mismatch for %s (if %d, RS packet %d)\n", 224 __func__, ip6_sprintf(ip6bufs, &saddr6), 225 ifp->if_addrlen, lladdrlen - 2)); 226 goto bad; 227 } 228 229 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_SOLICIT, 0); 230 231 freeit: 232 m_freem(m); 233 return; 234 235 bad: 236 ICMP6STAT_INC(icp6s_badrs); 237 m_freem(m); 238 } 239 240 #ifdef EXPERIMENTAL 241 /* 242 * An initial update routine for draft-ietf-6man-ipv6only-flag. 243 * We need to iterate over all default routers for the given 244 * interface to see whether they are all advertising the "S" 245 * (IPv6-Only) flag. If they do set, otherwise unset, the 246 * interface flag we later use to filter on. 247 */ 248 static void 249 defrtr_ipv6_only_ifp(struct ifnet *ifp) 250 { 251 struct nd_defrouter *dr; 252 bool ipv6_only, ipv6_only_old; 253 #ifdef INET 254 struct epoch_tracker et; 255 struct ifaddr *ifa; 256 bool has_ipv4_addr; 257 #endif 258 259 if (V_nd6_ignore_ipv6_only_ra != 0) 260 return; 261 262 ipv6_only = true; 263 ND6_RLOCK(); 264 TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry) 265 if (dr->ifp == ifp && 266 (dr->raflags & ND_RA_FLAG_IPV6_ONLY) == 0) 267 ipv6_only = false; 268 ND6_RUNLOCK(); 269 270 IF_AFDATA_WLOCK(ifp); 271 ipv6_only_old = ND_IFINFO(ifp)->flags & ND6_IFF_IPV6_ONLY; 272 IF_AFDATA_WUNLOCK(ifp); 273 274 /* If nothing changed, we have an early exit. */ 275 if (ipv6_only == ipv6_only_old) 276 return; 277 278 #ifdef INET 279 /* 280 * Should we want to set the IPV6-ONLY flag, check if the 281 * interface has a non-0/0 and non-link-local IPv4 address 282 * configured on it. If it has we will assume working 283 * IPv4 operations and will clear the interface flag. 284 */ 285 has_ipv4_addr = false; 286 if (ipv6_only) { 287 NET_EPOCH_ENTER(et); 288 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 289 if (ifa->ifa_addr->sa_family != AF_INET) 290 continue; 291 if (in_canforward( 292 satosin(ifa->ifa_addr)->sin_addr)) { 293 has_ipv4_addr = true; 294 break; 295 } 296 } 297 NET_EPOCH_EXIT(et); 298 } 299 if (ipv6_only && has_ipv4_addr) { 300 log(LOG_NOTICE, "%s rcvd RA w/ IPv6-Only flag set but has IPv4 " 301 "configured, ignoring IPv6-Only flag.\n", ifp->if_xname); 302 ipv6_only = false; 303 } 304 #endif 305 306 IF_AFDATA_WLOCK(ifp); 307 if (ipv6_only) 308 ND_IFINFO(ifp)->flags |= ND6_IFF_IPV6_ONLY; 309 else 310 ND_IFINFO(ifp)->flags &= ~ND6_IFF_IPV6_ONLY; 311 IF_AFDATA_WUNLOCK(ifp); 312 313 #ifdef notyet 314 /* Send notification of flag change. */ 315 #endif 316 } 317 318 static void 319 defrtr_ipv6_only_ipf_down(struct ifnet *ifp) 320 { 321 322 IF_AFDATA_WLOCK(ifp); 323 ND_IFINFO(ifp)->flags &= ~ND6_IFF_IPV6_ONLY; 324 IF_AFDATA_WUNLOCK(ifp); 325 } 326 #endif /* EXPERIMENTAL */ 327 328 void 329 nd6_ifnet_link_event(void *arg __unused, struct ifnet *ifp, int linkstate) 330 { 331 332 /* 333 * XXX-BZ we might want to trigger re-evaluation of our default router 334 * availability. E.g., on link down the default router might be 335 * unreachable but a different interface might still have connectivity. 336 */ 337 338 #ifdef EXPERIMENTAL 339 if (linkstate == LINK_STATE_DOWN) 340 defrtr_ipv6_only_ipf_down(ifp); 341 #endif 342 } 343 344 /* 345 * Receive Router Advertisement Message. 346 * 347 * Based on RFC 2461 348 * TODO: on-link bit on prefix information 349 * TODO: ND_RA_FLAG_{OTHER,MANAGED} processing 350 */ 351 void 352 nd6_ra_input(struct mbuf *m, int off, int icmp6len) 353 { 354 struct ifnet *ifp; 355 struct nd_ifinfo *ndi; 356 struct ip6_hdr *ip6; 357 struct nd_router_advert *nd_ra; 358 struct in6_addr saddr6; 359 struct nd_defrouter *dr; 360 union nd_opts ndopts; 361 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 362 int mcast; 363 364 /* 365 * We only accept RAs only when the per-interface flag 366 * ND6_IFF_ACCEPT_RTADV is on the receiving interface. 367 */ 368 ifp = m->m_pkthdr.rcvif; 369 ndi = ND_IFINFO(ifp); 370 if (!(ndi->flags & ND6_IFF_ACCEPT_RTADV)) 371 goto freeit; 372 373 /* RFC 6980: Nodes MUST silently ignore fragments */ 374 if(m->m_flags & M_FRAGMENTED) 375 goto freeit; 376 377 ip6 = mtod(m, struct ip6_hdr *); 378 if (ip6->ip6_hlim != 255) { 379 nd6log((LOG_ERR, 380 "%s: invalid hlim (%d) from %s to %s on %s\n", __func__, 381 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src), 382 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp))); 383 goto bad; 384 } 385 386 saddr6 = ip6->ip6_src; 387 if (!IN6_IS_ADDR_LINKLOCAL(&saddr6)) { 388 nd6log((LOG_ERR, 389 "%s: src %s is not link-local\n", __func__, 390 ip6_sprintf(ip6bufs, &saddr6))); 391 goto bad; 392 } 393 394 if (m->m_len < off + icmp6len) { 395 m = m_pullup(m, off + icmp6len); 396 if (m == NULL) { 397 IP6STAT_INC(ip6s_exthdrtoolong); 398 return; 399 } 400 } 401 ip6 = mtod(m, struct ip6_hdr *); 402 nd_ra = (struct nd_router_advert *)((caddr_t)ip6 + off); 403 404 icmp6len -= sizeof(*nd_ra); 405 nd6_option_init(nd_ra + 1, icmp6len, &ndopts); 406 if (nd6_options(&ndopts) < 0) { 407 nd6log((LOG_INFO, 408 "%s: invalid ND option, ignored\n", __func__)); 409 /* nd6_options have incremented stats */ 410 goto freeit; 411 } 412 413 mcast = 0; 414 dr = NULL; 415 { 416 struct nd_defrouter dr0; 417 u_int32_t advreachable = nd_ra->nd_ra_reachable; 418 419 /* remember if this is a multicasted advertisement */ 420 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) 421 mcast = 1; 422 423 bzero(&dr0, sizeof(dr0)); 424 dr0.rtaddr = saddr6; 425 dr0.raflags = nd_ra->nd_ra_flags_reserved; 426 /* 427 * Effectively-disable routes from RA messages when 428 * ND6_IFF_NO_RADR enabled on the receiving interface or 429 * (ip6.forwarding == 1 && ip6.rfc6204w3 != 1). 430 */ 431 if (ndi->flags & ND6_IFF_NO_RADR) 432 dr0.rtlifetime = 0; 433 else if (V_ip6_forwarding && !V_ip6_rfc6204w3) 434 dr0.rtlifetime = 0; 435 else 436 dr0.rtlifetime = ntohs(nd_ra->nd_ra_router_lifetime); 437 dr0.expire = time_uptime + dr0.rtlifetime; 438 dr0.ifp = ifp; 439 /* unspecified or not? (RFC 2461 6.3.4) */ 440 if (advreachable) { 441 advreachable = ntohl(advreachable); 442 if (advreachable <= MAX_REACHABLE_TIME && 443 ndi->basereachable != advreachable) { 444 ndi->basereachable = advreachable; 445 ndi->reachable = ND_COMPUTE_RTIME(ndi->basereachable); 446 ndi->recalctm = V_nd6_recalc_reachtm_interval; /* reset */ 447 } 448 } 449 if (nd_ra->nd_ra_retransmit) 450 ndi->retrans = ntohl(nd_ra->nd_ra_retransmit); 451 if (nd_ra->nd_ra_curhoplimit) { 452 if (ndi->chlim < nd_ra->nd_ra_curhoplimit) 453 ndi->chlim = nd_ra->nd_ra_curhoplimit; 454 else if (ndi->chlim != nd_ra->nd_ra_curhoplimit) { 455 log(LOG_ERR, "RA with a lower CurHopLimit sent from " 456 "%s on %s (current = %d, received = %d). " 457 "Ignored.\n", ip6_sprintf(ip6bufs, &ip6->ip6_src), 458 if_name(ifp), ndi->chlim, nd_ra->nd_ra_curhoplimit); 459 } 460 } 461 dr = defrtrlist_update(&dr0); 462 #ifdef EXPERIMENTAL 463 defrtr_ipv6_only_ifp(ifp); 464 #endif 465 } 466 467 /* 468 * prefix 469 */ 470 if (ndopts.nd_opts_pi) { 471 struct nd_opt_hdr *pt; 472 struct nd_opt_prefix_info *pi = NULL; 473 struct nd_prefixctl pr; 474 475 for (pt = (struct nd_opt_hdr *)ndopts.nd_opts_pi; 476 pt <= (struct nd_opt_hdr *)ndopts.nd_opts_pi_end; 477 pt = (struct nd_opt_hdr *)((caddr_t)pt + 478 (pt->nd_opt_len << 3))) { 479 if (pt->nd_opt_type != ND_OPT_PREFIX_INFORMATION) 480 continue; 481 pi = (struct nd_opt_prefix_info *)pt; 482 483 if (pi->nd_opt_pi_len != 4) { 484 nd6log((LOG_INFO, 485 "%s: invalid option len %d for prefix " 486 "information option, ignored\n", __func__, 487 pi->nd_opt_pi_len)); 488 continue; 489 } 490 491 if (128 < pi->nd_opt_pi_prefix_len) { 492 nd6log((LOG_INFO, 493 "%s: invalid prefix len %d for prefix " 494 "information option, ignored\n", __func__, 495 pi->nd_opt_pi_prefix_len)); 496 continue; 497 } 498 499 if (IN6_IS_ADDR_MULTICAST(&pi->nd_opt_pi_prefix) 500 || IN6_IS_ADDR_LINKLOCAL(&pi->nd_opt_pi_prefix)) { 501 nd6log((LOG_INFO, 502 "%s: invalid prefix %s, ignored\n", 503 __func__, ip6_sprintf(ip6bufs, 504 &pi->nd_opt_pi_prefix))); 505 continue; 506 } 507 508 bzero(&pr, sizeof(pr)); 509 pr.ndpr_prefix.sin6_family = AF_INET6; 510 pr.ndpr_prefix.sin6_len = sizeof(pr.ndpr_prefix); 511 pr.ndpr_prefix.sin6_addr = pi->nd_opt_pi_prefix; 512 pr.ndpr_ifp = (struct ifnet *)m->m_pkthdr.rcvif; 513 514 pr.ndpr_raf_onlink = (pi->nd_opt_pi_flags_reserved & 515 ND_OPT_PI_FLAG_ONLINK) ? 1 : 0; 516 pr.ndpr_raf_auto = (pi->nd_opt_pi_flags_reserved & 517 ND_OPT_PI_FLAG_AUTO) ? 1 : 0; 518 pr.ndpr_plen = pi->nd_opt_pi_prefix_len; 519 pr.ndpr_vltime = ntohl(pi->nd_opt_pi_valid_time); 520 pr.ndpr_pltime = ntohl(pi->nd_opt_pi_preferred_time); 521 (void)prelist_update(&pr, dr, m, mcast); 522 } 523 } 524 if (dr != NULL) { 525 defrouter_rele(dr); 526 dr = NULL; 527 } 528 529 /* 530 * MTU 531 */ 532 if (ndopts.nd_opts_mtu && ndopts.nd_opts_mtu->nd_opt_mtu_len == 1) { 533 u_long mtu; 534 u_long maxmtu; 535 536 mtu = (u_long)ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu); 537 538 /* lower bound */ 539 if (mtu < IPV6_MMTU) { 540 nd6log((LOG_INFO, "%s: bogus mtu option mtu=%lu sent " 541 "from %s, ignoring\n", __func__, 542 mtu, ip6_sprintf(ip6bufs, &ip6->ip6_src))); 543 goto skip; 544 } 545 546 /* upper bound */ 547 maxmtu = (ndi->maxmtu && ndi->maxmtu < ifp->if_mtu) 548 ? ndi->maxmtu : ifp->if_mtu; 549 if (mtu <= maxmtu) { 550 int change = (ndi->linkmtu != mtu); 551 552 ndi->linkmtu = mtu; 553 if (change) { 554 /* in6_maxmtu may change */ 555 in6_setmaxmtu(); 556 rt_updatemtu(ifp); 557 } 558 } else { 559 nd6log((LOG_INFO, "%s: bogus mtu=%lu sent from %s; " 560 "exceeds maxmtu %lu, ignoring\n", __func__, 561 mtu, ip6_sprintf(ip6bufs, &ip6->ip6_src), maxmtu)); 562 } 563 } 564 565 skip: 566 567 /* 568 * Source link layer address 569 */ 570 { 571 char *lladdr = NULL; 572 int lladdrlen = 0; 573 574 if (ndopts.nd_opts_src_lladdr) { 575 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1); 576 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3; 577 } 578 579 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 580 nd6log((LOG_INFO, 581 "%s: lladdrlen mismatch for %s (if %d, RA packet %d)\n", 582 __func__, ip6_sprintf(ip6bufs, &saddr6), 583 ifp->if_addrlen, lladdrlen - 2)); 584 goto bad; 585 } 586 587 nd6_cache_lladdr(ifp, &saddr6, lladdr, 588 lladdrlen, ND_ROUTER_ADVERT, 0); 589 590 /* 591 * Installing a link-layer address might change the state of the 592 * router's neighbor cache, which might also affect our on-link 593 * detection of adveritsed prefixes. 594 */ 595 pfxlist_onlink_check(); 596 } 597 598 freeit: 599 m_freem(m); 600 return; 601 602 bad: 603 ICMP6STAT_INC(icp6s_badra); 604 m_freem(m); 605 } 606 607 /* PFXRTR */ 608 static struct nd_pfxrouter * 609 pfxrtr_lookup(struct nd_prefix *pr, struct nd_defrouter *dr) 610 { 611 struct nd_pfxrouter *search; 612 613 ND6_LOCK_ASSERT(); 614 615 LIST_FOREACH(search, &pr->ndpr_advrtrs, pfr_entry) { 616 if (search->router == dr) 617 break; 618 } 619 return (search); 620 } 621 622 static void 623 pfxrtr_add(struct nd_prefix *pr, struct nd_defrouter *dr) 624 { 625 struct nd_pfxrouter *new; 626 bool update; 627 628 ND6_UNLOCK_ASSERT(); 629 630 ND6_RLOCK(); 631 if (pfxrtr_lookup(pr, dr) != NULL) { 632 ND6_RUNLOCK(); 633 return; 634 } 635 ND6_RUNLOCK(); 636 637 new = malloc(sizeof(*new), M_IP6NDP, M_NOWAIT | M_ZERO); 638 if (new == NULL) 639 return; 640 defrouter_ref(dr); 641 new->router = dr; 642 643 ND6_WLOCK(); 644 if (pfxrtr_lookup(pr, dr) == NULL) { 645 LIST_INSERT_HEAD(&pr->ndpr_advrtrs, new, pfr_entry); 646 update = true; 647 } else { 648 /* We lost a race to add the reference. */ 649 defrouter_rele(dr); 650 free(new, M_IP6NDP); 651 update = false; 652 } 653 ND6_WUNLOCK(); 654 655 if (update) 656 pfxlist_onlink_check(); 657 } 658 659 static void 660 pfxrtr_del(struct nd_pfxrouter *pfr) 661 { 662 663 ND6_WLOCK_ASSERT(); 664 665 LIST_REMOVE(pfr, pfr_entry); 666 defrouter_rele(pfr->router); 667 free(pfr, M_IP6NDP); 668 } 669 670 671 /* Default router list processing sub routines. */ 672 static void 673 defrouter_addreq(struct nd_defrouter *new) 674 { 675 struct sockaddr_in6 def, mask, gate; 676 struct rtentry *newrt = NULL; 677 unsigned int fibnum; 678 int error; 679 680 bzero(&def, sizeof(def)); 681 bzero(&mask, sizeof(mask)); 682 bzero(&gate, sizeof(gate)); 683 684 def.sin6_len = mask.sin6_len = gate.sin6_len = 685 sizeof(struct sockaddr_in6); 686 def.sin6_family = gate.sin6_family = AF_INET6; 687 gate.sin6_addr = new->rtaddr; 688 fibnum = new->ifp->if_fib; 689 690 error = in6_rtrequest(RTM_ADD, (struct sockaddr *)&def, 691 (struct sockaddr *)&gate, (struct sockaddr *)&mask, 692 RTF_GATEWAY, &newrt, fibnum); 693 if (newrt) { 694 rt_routemsg(RTM_ADD, newrt, new->ifp, 0, fibnum); 695 RTFREE_FUNC(newrt); 696 } 697 if (error == 0) 698 new->installed = 1; 699 } 700 701 /* 702 * Remove the default route for a given router. 703 * This is just a subroutine function for defrouter_select_fib(), and 704 * should not be called from anywhere else. 705 */ 706 static void 707 defrouter_delreq(struct nd_defrouter *dr) 708 { 709 struct sockaddr_in6 def, mask, gate; 710 struct rtentry *oldrt = NULL; 711 unsigned int fibnum; 712 713 bzero(&def, sizeof(def)); 714 bzero(&mask, sizeof(mask)); 715 bzero(&gate, sizeof(gate)); 716 717 def.sin6_len = mask.sin6_len = gate.sin6_len = 718 sizeof(struct sockaddr_in6); 719 def.sin6_family = gate.sin6_family = AF_INET6; 720 gate.sin6_addr = dr->rtaddr; 721 fibnum = dr->ifp->if_fib; 722 723 in6_rtrequest(RTM_DELETE, (struct sockaddr *)&def, 724 (struct sockaddr *)&gate, 725 (struct sockaddr *)&mask, RTF_GATEWAY, &oldrt, fibnum); 726 if (oldrt) { 727 rt_routemsg(RTM_DELETE, oldrt, dr->ifp, 0, fibnum); 728 RTFREE_FUNC(oldrt); 729 } 730 731 dr->installed = 0; 732 } 733 734 static void 735 defrouter_del(struct nd_defrouter *dr) 736 { 737 struct nd_defrouter *deldr = NULL; 738 struct nd_prefix *pr; 739 struct nd_pfxrouter *pfxrtr; 740 741 ND6_UNLOCK_ASSERT(); 742 743 /* 744 * Flush all the routing table entries that use the router 745 * as a next hop. 746 */ 747 if (ND_IFINFO(dr->ifp)->flags & ND6_IFF_ACCEPT_RTADV) 748 rt6_flush(&dr->rtaddr, dr->ifp); 749 750 #ifdef EXPERIMENTAL 751 defrtr_ipv6_only_ifp(dr->ifp); 752 #endif 753 754 if (dr->installed) { 755 deldr = dr; 756 defrouter_delreq(dr); 757 } 758 759 /* 760 * Also delete all the pointers to the router in each prefix lists. 761 */ 762 ND6_WLOCK(); 763 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) { 764 if ((pfxrtr = pfxrtr_lookup(pr, dr)) != NULL) 765 pfxrtr_del(pfxrtr); 766 } 767 ND6_WUNLOCK(); 768 769 pfxlist_onlink_check(); 770 771 /* 772 * If the router is the primary one, choose a new one. 773 * Note that defrouter_select_fib() will remove the current 774 * gateway from the routing table. 775 */ 776 if (deldr) 777 defrouter_select_fib(deldr->ifp->if_fib); 778 779 /* 780 * Release the list reference. 781 */ 782 defrouter_rele(dr); 783 } 784 785 786 struct nd_defrouter * 787 defrouter_lookup_locked(const struct in6_addr *addr, struct ifnet *ifp) 788 { 789 struct nd_defrouter *dr; 790 791 ND6_LOCK_ASSERT(); 792 TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry) 793 if (dr->ifp == ifp && IN6_ARE_ADDR_EQUAL(addr, &dr->rtaddr)) { 794 defrouter_ref(dr); 795 return (dr); 796 } 797 return (NULL); 798 } 799 800 struct nd_defrouter * 801 defrouter_lookup(const struct in6_addr *addr, struct ifnet *ifp) 802 { 803 struct nd_defrouter *dr; 804 805 ND6_RLOCK(); 806 dr = defrouter_lookup_locked(addr, ifp); 807 ND6_RUNLOCK(); 808 return (dr); 809 } 810 811 /* 812 * Remove all default routes from default router list. 813 */ 814 void 815 defrouter_reset(void) 816 { 817 struct nd_defrouter *dr, **dra; 818 int count, i; 819 820 count = i = 0; 821 822 /* 823 * We can't delete routes with the ND lock held, so make a copy of the 824 * current default router list and use that when deleting routes. 825 */ 826 ND6_RLOCK(); 827 TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry) 828 count++; 829 ND6_RUNLOCK(); 830 831 dra = malloc(count * sizeof(*dra), M_TEMP, M_WAITOK | M_ZERO); 832 833 ND6_RLOCK(); 834 TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry) { 835 if (i == count) 836 break; 837 defrouter_ref(dr); 838 dra[i++] = dr; 839 } 840 ND6_RUNLOCK(); 841 842 for (i = 0; i < count && dra[i] != NULL; i++) { 843 defrouter_delreq(dra[i]); 844 defrouter_rele(dra[i]); 845 } 846 free(dra, M_TEMP); 847 848 /* 849 * XXX should we also nuke any default routers in the kernel, by 850 * going through them by rtalloc1()? 851 */ 852 } 853 854 /* 855 * Look up a matching default router list entry and remove it. Returns true if a 856 * matching entry was found, false otherwise. 857 */ 858 bool 859 defrouter_remove(struct in6_addr *addr, struct ifnet *ifp) 860 { 861 struct nd_defrouter *dr; 862 863 ND6_WLOCK(); 864 dr = defrouter_lookup_locked(addr, ifp); 865 if (dr == NULL) { 866 ND6_WUNLOCK(); 867 return (false); 868 } 869 870 defrouter_unlink(dr, NULL); 871 ND6_WUNLOCK(); 872 defrouter_del(dr); 873 defrouter_rele(dr); 874 return (true); 875 } 876 877 /* 878 * for default router selection 879 * regards router-preference field as a 2-bit signed integer 880 */ 881 static int 882 rtpref(struct nd_defrouter *dr) 883 { 884 switch (dr->raflags & ND_RA_FLAG_RTPREF_MASK) { 885 case ND_RA_FLAG_RTPREF_HIGH: 886 return (RTPREF_HIGH); 887 case ND_RA_FLAG_RTPREF_MEDIUM: 888 case ND_RA_FLAG_RTPREF_RSV: 889 return (RTPREF_MEDIUM); 890 case ND_RA_FLAG_RTPREF_LOW: 891 return (RTPREF_LOW); 892 default: 893 /* 894 * This case should never happen. If it did, it would mean a 895 * serious bug of kernel internal. We thus always bark here. 896 * Or, can we even panic? 897 */ 898 log(LOG_ERR, "rtpref: impossible RA flag %x\n", dr->raflags); 899 return (RTPREF_INVALID); 900 } 901 /* NOTREACHED */ 902 } 903 904 /* 905 * Default Router Selection according to Section 6.3.6 of RFC 2461 and 906 * draft-ietf-ipngwg-router-selection: 907 * 1) Routers that are reachable or probably reachable should be preferred. 908 * If we have more than one (probably) reachable router, prefer ones 909 * with the highest router preference. 910 * 2) When no routers on the list are known to be reachable or 911 * probably reachable, routers SHOULD be selected in a round-robin 912 * fashion, regardless of router preference values. 913 * 3) If the Default Router List is empty, assume that all 914 * destinations are on-link. 915 * 916 * We assume nd_defrouter is sorted by router preference value. 917 * Since the code below covers both with and without router preference cases, 918 * we do not need to classify the cases by ifdef. 919 * 920 * At this moment, we do not try to install more than one default router, 921 * even when the multipath routing is available, because we're not sure about 922 * the benefits for stub hosts comparing to the risk of making the code 923 * complicated and the possibility of introducing bugs. 924 * 925 * We maintain a single list of routers for multiple FIBs, only considering one 926 * at a time based on the receiving interface's FIB. If @fibnum is RT_ALL_FIBS, 927 * we do the whole thing multiple times. 928 */ 929 void 930 defrouter_select_fib(int fibnum) 931 { 932 struct epoch_tracker et; 933 struct nd_defrouter *dr, *selected_dr, *installed_dr; 934 struct llentry *ln = NULL; 935 936 if (fibnum == RT_ALL_FIBS) { 937 for (fibnum = 0; fibnum < rt_numfibs; fibnum++) { 938 defrouter_select_fib(fibnum); 939 } 940 } 941 942 ND6_RLOCK(); 943 /* 944 * Let's handle easy case (3) first: 945 * If default router list is empty, there's nothing to be done. 946 */ 947 if (TAILQ_EMPTY(&V_nd6_defrouter)) { 948 ND6_RUNLOCK(); 949 return; 950 } 951 952 /* 953 * Search for a (probably) reachable router from the list. 954 * We just pick up the first reachable one (if any), assuming that 955 * the ordering rule of the list described in defrtrlist_update(). 956 */ 957 selected_dr = installed_dr = NULL; 958 TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry) { 959 NET_EPOCH_ENTER(et); 960 if (selected_dr == NULL && dr->ifp->if_fib == fibnum && 961 (ln = nd6_lookup(&dr->rtaddr, 0, dr->ifp)) && 962 ND6_IS_LLINFO_PROBREACH(ln)) { 963 selected_dr = dr; 964 defrouter_ref(selected_dr); 965 } 966 NET_EPOCH_EXIT(et); 967 if (ln != NULL) { 968 LLE_RUNLOCK(ln); 969 ln = NULL; 970 } 971 972 if (dr->installed && dr->ifp->if_fib == fibnum) { 973 if (installed_dr == NULL) { 974 installed_dr = dr; 975 defrouter_ref(installed_dr); 976 } else { 977 /* 978 * this should not happen. 979 * warn for diagnosis. 980 */ 981 log(LOG_ERR, "defrouter_select_fib: more than " 982 "one router is installed\n"); 983 } 984 } 985 } 986 /* 987 * If none of the default routers was found to be reachable, 988 * round-robin the list regardless of preference. 989 * Otherwise, if we have an installed router, check if the selected 990 * (reachable) router should really be preferred to the installed one. 991 * We only prefer the new router when the old one is not reachable 992 * or when the new one has a really higher preference value. 993 */ 994 if (selected_dr == NULL) { 995 if (installed_dr == NULL || 996 TAILQ_NEXT(installed_dr, dr_entry) == NULL) 997 dr = TAILQ_FIRST(&V_nd6_defrouter); 998 else 999 dr = TAILQ_NEXT(installed_dr, dr_entry); 1000 1001 /* Ensure we select a router for this FIB. */ 1002 TAILQ_FOREACH_FROM(dr, &V_nd6_defrouter, dr_entry) { 1003 if (dr->ifp->if_fib == fibnum) { 1004 selected_dr = dr; 1005 defrouter_ref(selected_dr); 1006 break; 1007 } 1008 } 1009 } else if (installed_dr != NULL) { 1010 NET_EPOCH_ENTER(et); 1011 if ((ln = nd6_lookup(&installed_dr->rtaddr, 0, 1012 installed_dr->ifp)) && 1013 ND6_IS_LLINFO_PROBREACH(ln) && 1014 installed_dr->ifp->if_fib == fibnum && 1015 rtpref(selected_dr) <= rtpref(installed_dr)) { 1016 defrouter_rele(selected_dr); 1017 selected_dr = installed_dr; 1018 } 1019 NET_EPOCH_EXIT(et); 1020 if (ln != NULL) 1021 LLE_RUNLOCK(ln); 1022 } 1023 ND6_RUNLOCK(); 1024 1025 /* 1026 * If we selected a router for this FIB and it's different 1027 * than the installed one, remove the installed router and 1028 * install the selected one in its place. 1029 */ 1030 if (installed_dr != selected_dr) { 1031 if (installed_dr != NULL) { 1032 defrouter_delreq(installed_dr); 1033 defrouter_rele(installed_dr); 1034 } 1035 if (selected_dr != NULL) 1036 defrouter_addreq(selected_dr); 1037 } 1038 if (selected_dr != NULL) 1039 defrouter_rele(selected_dr); 1040 } 1041 1042 static struct nd_defrouter * 1043 defrtrlist_update(struct nd_defrouter *new) 1044 { 1045 struct nd_defrouter *dr, *n; 1046 uint64_t genid; 1047 int oldpref; 1048 bool writelocked; 1049 1050 if (new->rtlifetime == 0) { 1051 defrouter_remove(&new->rtaddr, new->ifp); 1052 return (NULL); 1053 } 1054 1055 ND6_RLOCK(); 1056 writelocked = false; 1057 restart: 1058 dr = defrouter_lookup_locked(&new->rtaddr, new->ifp); 1059 if (dr != NULL) { 1060 oldpref = rtpref(dr); 1061 1062 /* override */ 1063 dr->raflags = new->raflags; /* XXX flag check */ 1064 dr->rtlifetime = new->rtlifetime; 1065 dr->expire = new->expire; 1066 1067 /* 1068 * If the preference does not change, there's no need 1069 * to sort the entries. Also make sure the selected 1070 * router is still installed in the kernel. 1071 */ 1072 if (dr->installed && rtpref(new) == oldpref) { 1073 if (writelocked) 1074 ND6_WUNLOCK(); 1075 else 1076 ND6_RUNLOCK(); 1077 return (dr); 1078 } 1079 } 1080 1081 /* 1082 * The router needs to be reinserted into the default router 1083 * list, so upgrade to a write lock. If that fails and the list 1084 * has potentially changed while the lock was dropped, we'll 1085 * redo the lookup with the write lock held. 1086 */ 1087 if (!writelocked) { 1088 writelocked = true; 1089 if (!ND6_TRY_UPGRADE()) { 1090 genid = V_nd6_list_genid; 1091 ND6_RUNLOCK(); 1092 ND6_WLOCK(); 1093 if (genid != V_nd6_list_genid) 1094 goto restart; 1095 } 1096 } 1097 1098 if (dr != NULL) { 1099 /* 1100 * The preferred router may have changed, so relocate this 1101 * router. 1102 */ 1103 TAILQ_REMOVE(&V_nd6_defrouter, dr, dr_entry); 1104 n = dr; 1105 } else { 1106 n = malloc(sizeof(*n), M_IP6NDP, M_NOWAIT | M_ZERO); 1107 if (n == NULL) { 1108 ND6_WUNLOCK(); 1109 return (NULL); 1110 } 1111 memcpy(n, new, sizeof(*n)); 1112 /* Initialize with an extra reference for the caller. */ 1113 refcount_init(&n->refcnt, 2); 1114 } 1115 1116 /* 1117 * Insert the new router in the Default Router List; 1118 * The Default Router List should be in the descending order 1119 * of router-preferece. Routers with the same preference are 1120 * sorted in the arriving time order. 1121 */ 1122 1123 /* insert at the end of the group */ 1124 TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry) { 1125 if (rtpref(n) > rtpref(dr)) 1126 break; 1127 } 1128 if (dr != NULL) 1129 TAILQ_INSERT_BEFORE(dr, n, dr_entry); 1130 else 1131 TAILQ_INSERT_TAIL(&V_nd6_defrouter, n, dr_entry); 1132 V_nd6_list_genid++; 1133 ND6_WUNLOCK(); 1134 1135 defrouter_select_fib(new->ifp->if_fib); 1136 1137 return (n); 1138 } 1139 1140 static int 1141 in6_init_prefix_ltimes(struct nd_prefix *ndpr) 1142 { 1143 if (ndpr->ndpr_pltime == ND6_INFINITE_LIFETIME) 1144 ndpr->ndpr_preferred = 0; 1145 else 1146 ndpr->ndpr_preferred = time_uptime + ndpr->ndpr_pltime; 1147 if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME) 1148 ndpr->ndpr_expire = 0; 1149 else 1150 ndpr->ndpr_expire = time_uptime + ndpr->ndpr_vltime; 1151 1152 return 0; 1153 } 1154 1155 static void 1156 in6_init_address_ltimes(struct nd_prefix *new, struct in6_addrlifetime *lt6) 1157 { 1158 /* init ia6t_expire */ 1159 if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME) 1160 lt6->ia6t_expire = 0; 1161 else { 1162 lt6->ia6t_expire = time_uptime; 1163 lt6->ia6t_expire += lt6->ia6t_vltime; 1164 } 1165 1166 /* init ia6t_preferred */ 1167 if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME) 1168 lt6->ia6t_preferred = 0; 1169 else { 1170 lt6->ia6t_preferred = time_uptime; 1171 lt6->ia6t_preferred += lt6->ia6t_pltime; 1172 } 1173 } 1174 1175 static struct in6_ifaddr * 1176 in6_ifadd(struct nd_prefixctl *pr, int mcast) 1177 { 1178 struct ifnet *ifp = pr->ndpr_ifp; 1179 struct ifaddr *ifa; 1180 struct in6_aliasreq ifra; 1181 struct in6_ifaddr *ia, *ib; 1182 int error, plen0; 1183 struct in6_addr mask; 1184 int prefixlen = pr->ndpr_plen; 1185 int updateflags; 1186 char ip6buf[INET6_ADDRSTRLEN]; 1187 1188 in6_prefixlen2mask(&mask, prefixlen); 1189 1190 /* 1191 * find a link-local address (will be interface ID). 1192 * Is it really mandatory? Theoretically, a global or a site-local 1193 * address can be configured without a link-local address, if we 1194 * have a unique interface identifier... 1195 * 1196 * it is not mandatory to have a link-local address, we can generate 1197 * interface identifier on the fly. we do this because: 1198 * (1) it should be the easiest way to find interface identifier. 1199 * (2) RFC2462 5.4 suggesting the use of the same interface identifier 1200 * for multiple addresses on a single interface, and possible shortcut 1201 * of DAD. we omitted DAD for this reason in the past. 1202 * (3) a user can prevent autoconfiguration of global address 1203 * by removing link-local address by hand (this is partly because we 1204 * don't have other way to control the use of IPv6 on an interface. 1205 * this has been our design choice - cf. NRL's "ifconfig auto"). 1206 * (4) it is easier to manage when an interface has addresses 1207 * with the same interface identifier, than to have multiple addresses 1208 * with different interface identifiers. 1209 */ 1210 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0); /* 0 is OK? */ 1211 if (ifa) 1212 ib = (struct in6_ifaddr *)ifa; 1213 else 1214 return NULL; 1215 1216 /* prefixlen + ifidlen must be equal to 128 */ 1217 plen0 = in6_mask2len(&ib->ia_prefixmask.sin6_addr, NULL); 1218 if (prefixlen != plen0) { 1219 ifa_free(ifa); 1220 nd6log((LOG_INFO, 1221 "%s: wrong prefixlen for %s (prefix=%d ifid=%d)\n", 1222 __func__, if_name(ifp), prefixlen, 128 - plen0)); 1223 return NULL; 1224 } 1225 1226 /* make ifaddr */ 1227 in6_prepare_ifra(&ifra, &pr->ndpr_prefix.sin6_addr, &mask); 1228 1229 IN6_MASK_ADDR(&ifra.ifra_addr.sin6_addr, &mask); 1230 /* interface ID */ 1231 ifra.ifra_addr.sin6_addr.s6_addr32[0] |= 1232 (ib->ia_addr.sin6_addr.s6_addr32[0] & ~mask.s6_addr32[0]); 1233 ifra.ifra_addr.sin6_addr.s6_addr32[1] |= 1234 (ib->ia_addr.sin6_addr.s6_addr32[1] & ~mask.s6_addr32[1]); 1235 ifra.ifra_addr.sin6_addr.s6_addr32[2] |= 1236 (ib->ia_addr.sin6_addr.s6_addr32[2] & ~mask.s6_addr32[2]); 1237 ifra.ifra_addr.sin6_addr.s6_addr32[3] |= 1238 (ib->ia_addr.sin6_addr.s6_addr32[3] & ~mask.s6_addr32[3]); 1239 ifa_free(ifa); 1240 1241 /* lifetimes. */ 1242 ifra.ifra_lifetime.ia6t_vltime = pr->ndpr_vltime; 1243 ifra.ifra_lifetime.ia6t_pltime = pr->ndpr_pltime; 1244 1245 /* XXX: scope zone ID? */ 1246 1247 ifra.ifra_flags |= IN6_IFF_AUTOCONF; /* obey autoconf */ 1248 1249 /* 1250 * Make sure that we do not have this address already. This should 1251 * usually not happen, but we can still see this case, e.g., if we 1252 * have manually configured the exact address to be configured. 1253 */ 1254 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, 1255 &ifra.ifra_addr.sin6_addr); 1256 if (ifa != NULL) { 1257 ifa_free(ifa); 1258 /* this should be rare enough to make an explicit log */ 1259 log(LOG_INFO, "in6_ifadd: %s is already configured\n", 1260 ip6_sprintf(ip6buf, &ifra.ifra_addr.sin6_addr)); 1261 return (NULL); 1262 } 1263 1264 /* 1265 * Allocate ifaddr structure, link into chain, etc. 1266 * If we are going to create a new address upon receiving a multicasted 1267 * RA, we need to impose a random delay before starting DAD. 1268 * [draft-ietf-ipv6-rfc2462bis-02.txt, Section 5.4.2] 1269 */ 1270 updateflags = 0; 1271 if (mcast) 1272 updateflags |= IN6_IFAUPDATE_DADDELAY; 1273 if ((error = in6_update_ifa(ifp, &ifra, NULL, updateflags)) != 0) { 1274 nd6log((LOG_ERR, 1275 "%s: failed to make ifaddr %s on %s (errno=%d)\n", __func__, 1276 ip6_sprintf(ip6buf, &ifra.ifra_addr.sin6_addr), 1277 if_name(ifp), error)); 1278 return (NULL); /* ifaddr must not have been allocated. */ 1279 } 1280 1281 ia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr); 1282 /* 1283 * XXXRW: Assumption of non-NULLness here might not be true with 1284 * fine-grained locking -- should we validate it? Or just return 1285 * earlier ifa rather than looking it up again? 1286 */ 1287 return (ia); /* this is always non-NULL and referenced. */ 1288 } 1289 1290 static struct nd_prefix * 1291 nd6_prefix_lookup_locked(struct nd_prefixctl *key) 1292 { 1293 struct nd_prefix *search; 1294 1295 ND6_LOCK_ASSERT(); 1296 1297 LIST_FOREACH(search, &V_nd_prefix, ndpr_entry) { 1298 if (key->ndpr_ifp == search->ndpr_ifp && 1299 key->ndpr_plen == search->ndpr_plen && 1300 in6_are_prefix_equal(&key->ndpr_prefix.sin6_addr, 1301 &search->ndpr_prefix.sin6_addr, key->ndpr_plen)) { 1302 nd6_prefix_ref(search); 1303 break; 1304 } 1305 } 1306 return (search); 1307 } 1308 1309 struct nd_prefix * 1310 nd6_prefix_lookup(struct nd_prefixctl *key) 1311 { 1312 struct nd_prefix *search; 1313 1314 ND6_RLOCK(); 1315 search = nd6_prefix_lookup_locked(key); 1316 ND6_RUNLOCK(); 1317 return (search); 1318 } 1319 1320 void 1321 nd6_prefix_ref(struct nd_prefix *pr) 1322 { 1323 1324 refcount_acquire(&pr->ndpr_refcnt); 1325 } 1326 1327 void 1328 nd6_prefix_rele(struct nd_prefix *pr) 1329 { 1330 1331 if (refcount_release(&pr->ndpr_refcnt)) { 1332 KASSERT(LIST_EMPTY(&pr->ndpr_advrtrs), 1333 ("prefix %p has advertising routers", pr)); 1334 free(pr, M_IP6NDP); 1335 } 1336 } 1337 1338 int 1339 nd6_prelist_add(struct nd_prefixctl *pr, struct nd_defrouter *dr, 1340 struct nd_prefix **newp) 1341 { 1342 struct nd_prefix *new; 1343 char ip6buf[INET6_ADDRSTRLEN]; 1344 int error; 1345 1346 new = malloc(sizeof(*new), M_IP6NDP, M_NOWAIT | M_ZERO); 1347 if (new == NULL) 1348 return (ENOMEM); 1349 refcount_init(&new->ndpr_refcnt, newp != NULL ? 2 : 1); 1350 new->ndpr_ifp = pr->ndpr_ifp; 1351 new->ndpr_prefix = pr->ndpr_prefix; 1352 new->ndpr_plen = pr->ndpr_plen; 1353 new->ndpr_vltime = pr->ndpr_vltime; 1354 new->ndpr_pltime = pr->ndpr_pltime; 1355 new->ndpr_flags = pr->ndpr_flags; 1356 if ((error = in6_init_prefix_ltimes(new)) != 0) { 1357 free(new, M_IP6NDP); 1358 return (error); 1359 } 1360 new->ndpr_lastupdate = time_uptime; 1361 1362 /* initialization */ 1363 LIST_INIT(&new->ndpr_advrtrs); 1364 in6_prefixlen2mask(&new->ndpr_mask, new->ndpr_plen); 1365 /* make prefix in the canonical form */ 1366 IN6_MASK_ADDR(&new->ndpr_prefix.sin6_addr, &new->ndpr_mask); 1367 1368 ND6_WLOCK(); 1369 LIST_INSERT_HEAD(&V_nd_prefix, new, ndpr_entry); 1370 V_nd6_list_genid++; 1371 ND6_WUNLOCK(); 1372 1373 /* ND_OPT_PI_FLAG_ONLINK processing */ 1374 if (new->ndpr_raf_onlink) { 1375 struct epoch_tracker et; 1376 1377 ND6_ONLINK_LOCK(); 1378 NET_EPOCH_ENTER(et); 1379 if ((error = nd6_prefix_onlink(new)) != 0) { 1380 nd6log((LOG_ERR, "%s: failed to make the prefix %s/%d " 1381 "on-link on %s (errno=%d)\n", __func__, 1382 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr), 1383 pr->ndpr_plen, if_name(pr->ndpr_ifp), error)); 1384 /* proceed anyway. XXX: is it correct? */ 1385 } 1386 NET_EPOCH_EXIT(et); 1387 ND6_ONLINK_UNLOCK(); 1388 } 1389 1390 if (dr != NULL) 1391 pfxrtr_add(new, dr); 1392 if (newp != NULL) 1393 *newp = new; 1394 return (0); 1395 } 1396 1397 /* 1398 * Remove a prefix from the prefix list and optionally stash it in a 1399 * caller-provided list. 1400 * 1401 * The ND6 lock must be held. 1402 */ 1403 void 1404 nd6_prefix_unlink(struct nd_prefix *pr, struct nd_prhead *list) 1405 { 1406 1407 ND6_WLOCK_ASSERT(); 1408 1409 LIST_REMOVE(pr, ndpr_entry); 1410 V_nd6_list_genid++; 1411 if (list != NULL) 1412 LIST_INSERT_HEAD(list, pr, ndpr_entry); 1413 } 1414 1415 /* 1416 * Free an unlinked prefix, first marking it off-link if necessary. 1417 */ 1418 void 1419 nd6_prefix_del(struct nd_prefix *pr) 1420 { 1421 struct nd_pfxrouter *pfr, *next; 1422 int e; 1423 char ip6buf[INET6_ADDRSTRLEN]; 1424 1425 KASSERT(pr->ndpr_addrcnt == 0, 1426 ("prefix %p has referencing addresses", pr)); 1427 ND6_UNLOCK_ASSERT(); 1428 1429 /* 1430 * Though these flags are now meaningless, we'd rather keep the value 1431 * of pr->ndpr_raf_onlink and pr->ndpr_raf_auto not to confuse users 1432 * when executing "ndp -p". 1433 */ 1434 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0) { 1435 ND6_ONLINK_LOCK(); 1436 if ((e = nd6_prefix_offlink(pr)) != 0) { 1437 nd6log((LOG_ERR, 1438 "%s: failed to make the prefix %s/%d offlink on %s " 1439 "(errno=%d)\n", __func__, 1440 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr), 1441 pr->ndpr_plen, if_name(pr->ndpr_ifp), e)); 1442 /* what should we do? */ 1443 } 1444 ND6_ONLINK_UNLOCK(); 1445 } 1446 1447 /* Release references to routers that have advertised this prefix. */ 1448 ND6_WLOCK(); 1449 LIST_FOREACH_SAFE(pfr, &pr->ndpr_advrtrs, pfr_entry, next) 1450 pfxrtr_del(pfr); 1451 ND6_WUNLOCK(); 1452 1453 nd6_prefix_rele(pr); 1454 1455 pfxlist_onlink_check(); 1456 } 1457 1458 static int 1459 prelist_update(struct nd_prefixctl *new, struct nd_defrouter *dr, 1460 struct mbuf *m, int mcast) 1461 { 1462 struct in6_ifaddr *ia6 = NULL, *ia6_match = NULL; 1463 struct ifaddr *ifa; 1464 struct ifnet *ifp = new->ndpr_ifp; 1465 struct nd_prefix *pr; 1466 int error = 0; 1467 int auth; 1468 struct in6_addrlifetime lt6_tmp; 1469 char ip6buf[INET6_ADDRSTRLEN]; 1470 1471 NET_EPOCH_ASSERT(); 1472 1473 auth = 0; 1474 if (m) { 1475 /* 1476 * Authenticity for NA consists authentication for 1477 * both IP header and IP datagrams, doesn't it ? 1478 */ 1479 #if defined(M_AUTHIPHDR) && defined(M_AUTHIPDGM) 1480 auth = ((m->m_flags & M_AUTHIPHDR) && 1481 (m->m_flags & M_AUTHIPDGM)); 1482 #endif 1483 } 1484 1485 if ((pr = nd6_prefix_lookup(new)) != NULL) { 1486 /* 1487 * nd6_prefix_lookup() ensures that pr and new have the same 1488 * prefix on a same interface. 1489 */ 1490 1491 /* 1492 * Update prefix information. Note that the on-link (L) bit 1493 * and the autonomous (A) bit should NOT be changed from 1 1494 * to 0. 1495 */ 1496 if (new->ndpr_raf_onlink == 1) 1497 pr->ndpr_raf_onlink = 1; 1498 if (new->ndpr_raf_auto == 1) 1499 pr->ndpr_raf_auto = 1; 1500 if (new->ndpr_raf_onlink) { 1501 pr->ndpr_vltime = new->ndpr_vltime; 1502 pr->ndpr_pltime = new->ndpr_pltime; 1503 (void)in6_init_prefix_ltimes(pr); /* XXX error case? */ 1504 pr->ndpr_lastupdate = time_uptime; 1505 } 1506 1507 if (new->ndpr_raf_onlink && 1508 (pr->ndpr_stateflags & NDPRF_ONLINK) == 0) { 1509 ND6_ONLINK_LOCK(); 1510 if ((error = nd6_prefix_onlink(pr)) != 0) { 1511 nd6log((LOG_ERR, 1512 "%s: failed to make the prefix %s/%d " 1513 "on-link on %s (errno=%d)\n", __func__, 1514 ip6_sprintf(ip6buf, 1515 &pr->ndpr_prefix.sin6_addr), 1516 pr->ndpr_plen, if_name(pr->ndpr_ifp), 1517 error)); 1518 /* proceed anyway. XXX: is it correct? */ 1519 } 1520 ND6_ONLINK_UNLOCK(); 1521 } 1522 1523 if (dr != NULL) 1524 pfxrtr_add(pr, dr); 1525 } else { 1526 if (new->ndpr_vltime == 0) 1527 goto end; 1528 if (new->ndpr_raf_onlink == 0 && new->ndpr_raf_auto == 0) 1529 goto end; 1530 1531 error = nd6_prelist_add(new, dr, &pr); 1532 if (error != 0) { 1533 nd6log((LOG_NOTICE, "%s: nd6_prelist_add() failed for " 1534 "the prefix %s/%d on %s (errno=%d)\n", __func__, 1535 ip6_sprintf(ip6buf, &new->ndpr_prefix.sin6_addr), 1536 new->ndpr_plen, if_name(new->ndpr_ifp), error)); 1537 goto end; /* we should just give up in this case. */ 1538 } 1539 1540 /* 1541 * XXX: from the ND point of view, we can ignore a prefix 1542 * with the on-link bit being zero. However, we need a 1543 * prefix structure for references from autoconfigured 1544 * addresses. Thus, we explicitly make sure that the prefix 1545 * itself expires now. 1546 */ 1547 if (pr->ndpr_raf_onlink == 0) { 1548 pr->ndpr_vltime = 0; 1549 pr->ndpr_pltime = 0; 1550 in6_init_prefix_ltimes(pr); 1551 } 1552 } 1553 1554 /* 1555 * Address autoconfiguration based on Section 5.5.3 of RFC 2462. 1556 * Note that pr must be non NULL at this point. 1557 */ 1558 1559 /* 5.5.3 (a). Ignore the prefix without the A bit set. */ 1560 if (!new->ndpr_raf_auto) 1561 goto end; 1562 1563 /* 1564 * 5.5.3 (b). the link-local prefix should have been ignored in 1565 * nd6_ra_input. 1566 */ 1567 1568 /* 5.5.3 (c). Consistency check on lifetimes: pltime <= vltime. */ 1569 if (new->ndpr_pltime > new->ndpr_vltime) { 1570 error = EINVAL; /* XXX: won't be used */ 1571 goto end; 1572 } 1573 1574 /* 1575 * 5.5.3 (d). If the prefix advertised is not equal to the prefix of 1576 * an address configured by stateless autoconfiguration already in the 1577 * list of addresses associated with the interface, and the Valid 1578 * Lifetime is not 0, form an address. We first check if we have 1579 * a matching prefix. 1580 * Note: we apply a clarification in rfc2462bis-02 here. We only 1581 * consider autoconfigured addresses while RFC2462 simply said 1582 * "address". 1583 */ 1584 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1585 struct in6_ifaddr *ifa6; 1586 u_int32_t remaininglifetime; 1587 1588 if (ifa->ifa_addr->sa_family != AF_INET6) 1589 continue; 1590 1591 ifa6 = (struct in6_ifaddr *)ifa; 1592 1593 /* 1594 * We only consider autoconfigured addresses as per rfc2462bis. 1595 */ 1596 if (!(ifa6->ia6_flags & IN6_IFF_AUTOCONF)) 1597 continue; 1598 1599 /* 1600 * Spec is not clear here, but I believe we should concentrate 1601 * on unicast (i.e. not anycast) addresses. 1602 * XXX: other ia6_flags? detached or duplicated? 1603 */ 1604 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0) 1605 continue; 1606 1607 /* 1608 * Ignore the address if it is not associated with a prefix 1609 * or is associated with a prefix that is different from this 1610 * one. (pr is never NULL here) 1611 */ 1612 if (ifa6->ia6_ndpr != pr) 1613 continue; 1614 1615 if (ia6_match == NULL) /* remember the first one */ 1616 ia6_match = ifa6; 1617 1618 /* 1619 * An already autoconfigured address matched. Now that we 1620 * are sure there is at least one matched address, we can 1621 * proceed to 5.5.3. (e): update the lifetimes according to the 1622 * "two hours" rule and the privacy extension. 1623 * We apply some clarifications in rfc2462bis: 1624 * - use remaininglifetime instead of storedlifetime as a 1625 * variable name 1626 * - remove the dead code in the "two-hour" rule 1627 */ 1628 #define TWOHOUR (120*60) 1629 lt6_tmp = ifa6->ia6_lifetime; 1630 1631 if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME) 1632 remaininglifetime = ND6_INFINITE_LIFETIME; 1633 else if (time_uptime - ifa6->ia6_updatetime > 1634 lt6_tmp.ia6t_vltime) { 1635 /* 1636 * The case of "invalid" address. We should usually 1637 * not see this case. 1638 */ 1639 remaininglifetime = 0; 1640 } else 1641 remaininglifetime = lt6_tmp.ia6t_vltime - 1642 (time_uptime - ifa6->ia6_updatetime); 1643 1644 /* when not updating, keep the current stored lifetime. */ 1645 lt6_tmp.ia6t_vltime = remaininglifetime; 1646 1647 if (TWOHOUR < new->ndpr_vltime || 1648 remaininglifetime < new->ndpr_vltime) { 1649 lt6_tmp.ia6t_vltime = new->ndpr_vltime; 1650 } else if (remaininglifetime <= TWOHOUR) { 1651 if (auth) { 1652 lt6_tmp.ia6t_vltime = new->ndpr_vltime; 1653 } 1654 } else { 1655 /* 1656 * new->ndpr_vltime <= TWOHOUR && 1657 * TWOHOUR < remaininglifetime 1658 */ 1659 lt6_tmp.ia6t_vltime = TWOHOUR; 1660 } 1661 1662 /* The 2 hour rule is not imposed for preferred lifetime. */ 1663 lt6_tmp.ia6t_pltime = new->ndpr_pltime; 1664 1665 in6_init_address_ltimes(pr, <6_tmp); 1666 1667 /* 1668 * We need to treat lifetimes for temporary addresses 1669 * differently, according to 1670 * draft-ietf-ipv6-privacy-addrs-v2-01.txt 3.3 (1); 1671 * we only update the lifetimes when they are in the maximum 1672 * intervals. 1673 */ 1674 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0) { 1675 u_int32_t maxvltime, maxpltime; 1676 1677 if (V_ip6_temp_valid_lifetime > 1678 (u_int32_t)((time_uptime - ifa6->ia6_createtime) + 1679 V_ip6_desync_factor)) { 1680 maxvltime = V_ip6_temp_valid_lifetime - 1681 (time_uptime - ifa6->ia6_createtime) - 1682 V_ip6_desync_factor; 1683 } else 1684 maxvltime = 0; 1685 if (V_ip6_temp_preferred_lifetime > 1686 (u_int32_t)((time_uptime - ifa6->ia6_createtime) + 1687 V_ip6_desync_factor)) { 1688 maxpltime = V_ip6_temp_preferred_lifetime - 1689 (time_uptime - ifa6->ia6_createtime) - 1690 V_ip6_desync_factor; 1691 } else 1692 maxpltime = 0; 1693 1694 if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME || 1695 lt6_tmp.ia6t_vltime > maxvltime) { 1696 lt6_tmp.ia6t_vltime = maxvltime; 1697 } 1698 if (lt6_tmp.ia6t_pltime == ND6_INFINITE_LIFETIME || 1699 lt6_tmp.ia6t_pltime > maxpltime) { 1700 lt6_tmp.ia6t_pltime = maxpltime; 1701 } 1702 } 1703 ifa6->ia6_lifetime = lt6_tmp; 1704 ifa6->ia6_updatetime = time_uptime; 1705 } 1706 if (ia6_match == NULL && new->ndpr_vltime) { 1707 int ifidlen; 1708 1709 /* 1710 * 5.5.3 (d) (continued) 1711 * No address matched and the valid lifetime is non-zero. 1712 * Create a new address. 1713 */ 1714 1715 /* 1716 * Prefix Length check: 1717 * If the sum of the prefix length and interface identifier 1718 * length does not equal 128 bits, the Prefix Information 1719 * option MUST be ignored. The length of the interface 1720 * identifier is defined in a separate link-type specific 1721 * document. 1722 */ 1723 ifidlen = in6_if2idlen(ifp); 1724 if (ifidlen < 0) { 1725 /* this should not happen, so we always log it. */ 1726 log(LOG_ERR, "prelist_update: IFID undefined (%s)\n", 1727 if_name(ifp)); 1728 goto end; 1729 } 1730 if (ifidlen + pr->ndpr_plen != 128) { 1731 nd6log((LOG_INFO, 1732 "%s: invalid prefixlen %d for %s, ignored\n", 1733 __func__, pr->ndpr_plen, if_name(ifp))); 1734 goto end; 1735 } 1736 1737 if ((ia6 = in6_ifadd(new, mcast)) != NULL) { 1738 /* 1739 * note that we should use pr (not new) for reference. 1740 */ 1741 pr->ndpr_addrcnt++; 1742 ia6->ia6_ndpr = pr; 1743 1744 /* 1745 * RFC 3041 3.3 (2). 1746 * When a new public address is created as described 1747 * in RFC2462, also create a new temporary address. 1748 * 1749 * RFC 3041 3.5. 1750 * When an interface connects to a new link, a new 1751 * randomized interface identifier should be generated 1752 * immediately together with a new set of temporary 1753 * addresses. Thus, we specifiy 1 as the 2nd arg of 1754 * in6_tmpifadd(). 1755 */ 1756 if (V_ip6_use_tempaddr) { 1757 int e; 1758 if ((e = in6_tmpifadd(ia6, 1, 1)) != 0) { 1759 nd6log((LOG_NOTICE, "%s: failed to " 1760 "create a temporary address " 1761 "(errno=%d)\n", __func__, e)); 1762 } 1763 } 1764 ifa_free(&ia6->ia_ifa); 1765 1766 /* 1767 * A newly added address might affect the status 1768 * of other addresses, so we check and update it. 1769 * XXX: what if address duplication happens? 1770 */ 1771 pfxlist_onlink_check(); 1772 } else { 1773 /* just set an error. do not bark here. */ 1774 error = EADDRNOTAVAIL; /* XXX: might be unused. */ 1775 } 1776 } 1777 1778 end: 1779 if (pr != NULL) 1780 nd6_prefix_rele(pr); 1781 return (error); 1782 } 1783 1784 /* 1785 * A supplement function used in the on-link detection below; 1786 * detect if a given prefix has a (probably) reachable advertising router. 1787 * XXX: lengthy function name... 1788 */ 1789 static struct nd_pfxrouter * 1790 find_pfxlist_reachable_router(struct nd_prefix *pr) 1791 { 1792 struct epoch_tracker et; 1793 struct nd_pfxrouter *pfxrtr; 1794 struct llentry *ln; 1795 int canreach; 1796 1797 ND6_LOCK_ASSERT(); 1798 1799 NET_EPOCH_ENTER(et); 1800 LIST_FOREACH(pfxrtr, &pr->ndpr_advrtrs, pfr_entry) { 1801 ln = nd6_lookup(&pfxrtr->router->rtaddr, 0, pfxrtr->router->ifp); 1802 if (ln == NULL) 1803 continue; 1804 canreach = ND6_IS_LLINFO_PROBREACH(ln); 1805 LLE_RUNLOCK(ln); 1806 if (canreach) 1807 break; 1808 } 1809 NET_EPOCH_EXIT(et); 1810 return (pfxrtr); 1811 } 1812 1813 /* 1814 * Check if each prefix in the prefix list has at least one available router 1815 * that advertised the prefix (a router is "available" if its neighbor cache 1816 * entry is reachable or probably reachable). 1817 * If the check fails, the prefix may be off-link, because, for example, 1818 * we have moved from the network but the lifetime of the prefix has not 1819 * expired yet. So we should not use the prefix if there is another prefix 1820 * that has an available router. 1821 * But, if there is no prefix that has an available router, we still regard 1822 * all the prefixes as on-link. This is because we can't tell if all the 1823 * routers are simply dead or if we really moved from the network and there 1824 * is no router around us. 1825 */ 1826 void 1827 pfxlist_onlink_check(void) 1828 { 1829 struct nd_prefix *pr; 1830 struct in6_ifaddr *ifa; 1831 struct nd_defrouter *dr; 1832 struct nd_pfxrouter *pfxrtr = NULL; 1833 struct rm_priotracker in6_ifa_tracker; 1834 uint64_t genid; 1835 uint32_t flags; 1836 1837 ND6_ONLINK_LOCK(); 1838 ND6_RLOCK(); 1839 1840 /* 1841 * Check if there is a prefix that has a reachable advertising 1842 * router. 1843 */ 1844 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) { 1845 if (pr->ndpr_raf_onlink && find_pfxlist_reachable_router(pr)) 1846 break; 1847 } 1848 1849 /* 1850 * If we have no such prefix, check whether we still have a router 1851 * that does not advertise any prefixes. 1852 */ 1853 if (pr == NULL) { 1854 TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry) { 1855 struct nd_prefix *pr0; 1856 1857 LIST_FOREACH(pr0, &V_nd_prefix, ndpr_entry) { 1858 if ((pfxrtr = pfxrtr_lookup(pr0, dr)) != NULL) 1859 break; 1860 } 1861 if (pfxrtr != NULL) 1862 break; 1863 } 1864 } 1865 if (pr != NULL || (!TAILQ_EMPTY(&V_nd6_defrouter) && pfxrtr == NULL)) { 1866 /* 1867 * There is at least one prefix that has a reachable router, 1868 * or at least a router which probably does not advertise 1869 * any prefixes. The latter would be the case when we move 1870 * to a new link where we have a router that does not provide 1871 * prefixes and we configure an address by hand. 1872 * Detach prefixes which have no reachable advertising 1873 * router, and attach other prefixes. 1874 */ 1875 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) { 1876 /* XXX: a link-local prefix should never be detached */ 1877 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr) || 1878 pr->ndpr_raf_onlink == 0 || 1879 pr->ndpr_raf_auto == 0) 1880 continue; 1881 1882 if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 && 1883 find_pfxlist_reachable_router(pr) == NULL) 1884 pr->ndpr_stateflags |= NDPRF_DETACHED; 1885 else if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 && 1886 find_pfxlist_reachable_router(pr) != NULL) 1887 pr->ndpr_stateflags &= ~NDPRF_DETACHED; 1888 } 1889 } else { 1890 /* there is no prefix that has a reachable router */ 1891 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) { 1892 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr) || 1893 pr->ndpr_raf_onlink == 0 || 1894 pr->ndpr_raf_auto == 0) 1895 continue; 1896 pr->ndpr_stateflags &= ~NDPRF_DETACHED; 1897 } 1898 } 1899 1900 /* 1901 * Remove each interface route associated with a (just) detached 1902 * prefix, and reinstall the interface route for a (just) attached 1903 * prefix. Note that all attempt of reinstallation does not 1904 * necessarily success, when a same prefix is shared among multiple 1905 * interfaces. Such cases will be handled in nd6_prefix_onlink, 1906 * so we don't have to care about them. 1907 */ 1908 restart: 1909 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) { 1910 char ip6buf[INET6_ADDRSTRLEN]; 1911 int e; 1912 1913 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr) || 1914 pr->ndpr_raf_onlink == 0 || 1915 pr->ndpr_raf_auto == 0) 1916 continue; 1917 1918 flags = pr->ndpr_stateflags & (NDPRF_DETACHED | NDPRF_ONLINK); 1919 if (flags == 0 || flags == (NDPRF_DETACHED | NDPRF_ONLINK)) { 1920 genid = V_nd6_list_genid; 1921 ND6_RUNLOCK(); 1922 if ((flags & NDPRF_ONLINK) != 0 && 1923 (e = nd6_prefix_offlink(pr)) != 0) { 1924 nd6log((LOG_ERR, 1925 "%s: failed to make %s/%d offlink " 1926 "(errno=%d)\n", __func__, 1927 ip6_sprintf(ip6buf, 1928 &pr->ndpr_prefix.sin6_addr), 1929 pr->ndpr_plen, e)); 1930 } else if ((flags & NDPRF_ONLINK) == 0 && 1931 (e = nd6_prefix_onlink(pr)) != 0) { 1932 nd6log((LOG_ERR, 1933 "%s: failed to make %s/%d onlink " 1934 "(errno=%d)\n", __func__, 1935 ip6_sprintf(ip6buf, 1936 &pr->ndpr_prefix.sin6_addr), 1937 pr->ndpr_plen, e)); 1938 } 1939 ND6_RLOCK(); 1940 if (genid != V_nd6_list_genid) 1941 goto restart; 1942 } 1943 } 1944 1945 /* 1946 * Changes on the prefix status might affect address status as well. 1947 * Make sure that all addresses derived from an attached prefix are 1948 * attached, and that all addresses derived from a detached prefix are 1949 * detached. Note, however, that a manually configured address should 1950 * always be attached. 1951 * The precise detection logic is same as the one for prefixes. 1952 */ 1953 IN6_IFADDR_RLOCK(&in6_ifa_tracker); 1954 CK_STAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) { 1955 if (!(ifa->ia6_flags & IN6_IFF_AUTOCONF)) 1956 continue; 1957 1958 if (ifa->ia6_ndpr == NULL) { 1959 /* 1960 * This can happen when we first configure the address 1961 * (i.e. the address exists, but the prefix does not). 1962 * XXX: complicated relationships... 1963 */ 1964 continue; 1965 } 1966 1967 if (find_pfxlist_reachable_router(ifa->ia6_ndpr)) 1968 break; 1969 } 1970 if (ifa) { 1971 CK_STAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) { 1972 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0) 1973 continue; 1974 1975 if (ifa->ia6_ndpr == NULL) /* XXX: see above. */ 1976 continue; 1977 1978 if (find_pfxlist_reachable_router(ifa->ia6_ndpr)) { 1979 if (ifa->ia6_flags & IN6_IFF_DETACHED) { 1980 ifa->ia6_flags &= ~IN6_IFF_DETACHED; 1981 ifa->ia6_flags |= IN6_IFF_TENTATIVE; 1982 nd6_dad_start((struct ifaddr *)ifa, 0); 1983 } 1984 } else { 1985 ifa->ia6_flags |= IN6_IFF_DETACHED; 1986 } 1987 } 1988 } else { 1989 CK_STAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) { 1990 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0) 1991 continue; 1992 1993 if (ifa->ia6_flags & IN6_IFF_DETACHED) { 1994 ifa->ia6_flags &= ~IN6_IFF_DETACHED; 1995 ifa->ia6_flags |= IN6_IFF_TENTATIVE; 1996 /* Do we need a delay in this case? */ 1997 nd6_dad_start((struct ifaddr *)ifa, 0); 1998 } 1999 } 2000 } 2001 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 2002 ND6_RUNLOCK(); 2003 ND6_ONLINK_UNLOCK(); 2004 } 2005 2006 static int 2007 nd6_prefix_onlink_rtrequest(struct nd_prefix *pr, struct ifaddr *ifa) 2008 { 2009 struct sockaddr_dl_short sdl; 2010 struct rtentry *rt; 2011 struct sockaddr_in6 mask6; 2012 u_long rtflags; 2013 int error, a_failure, fibnum, maxfib; 2014 2015 /* 2016 * in6_ifinit() sets nd6_rtrequest to ifa_rtrequest for all ifaddrs. 2017 * ifa->ifa_rtrequest = nd6_rtrequest; 2018 */ 2019 bzero(&mask6, sizeof(mask6)); 2020 mask6.sin6_len = sizeof(mask6); 2021 mask6.sin6_addr = pr->ndpr_mask; 2022 rtflags = (ifa->ifa_flags & ~IFA_RTSELF) | RTF_UP; 2023 2024 bzero(&sdl, sizeof(struct sockaddr_dl_short)); 2025 sdl.sdl_len = sizeof(struct sockaddr_dl_short); 2026 sdl.sdl_family = AF_LINK; 2027 sdl.sdl_type = ifa->ifa_ifp->if_type; 2028 sdl.sdl_index = ifa->ifa_ifp->if_index; 2029 2030 if(V_rt_add_addr_allfibs) { 2031 fibnum = 0; 2032 maxfib = rt_numfibs; 2033 } else { 2034 fibnum = ifa->ifa_ifp->if_fib; 2035 maxfib = fibnum + 1; 2036 } 2037 a_failure = 0; 2038 for (; fibnum < maxfib; fibnum++) { 2039 2040 rt = NULL; 2041 error = in6_rtrequest(RTM_ADD, 2042 (struct sockaddr *)&pr->ndpr_prefix, (struct sockaddr *)&sdl, 2043 (struct sockaddr *)&mask6, rtflags, &rt, fibnum); 2044 if (error != 0) { 2045 char ip6buf[INET6_ADDRSTRLEN]; 2046 char ip6bufg[INET6_ADDRSTRLEN]; 2047 char ip6bufm[INET6_ADDRSTRLEN]; 2048 struct sockaddr_in6 *sin6; 2049 2050 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 2051 nd6log((LOG_ERR, "%s: failed to add " 2052 "route for a prefix (%s/%d) on %s, gw=%s, mask=%s, " 2053 "flags=%lx errno = %d\n", __func__, 2054 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr), 2055 pr->ndpr_plen, if_name(pr->ndpr_ifp), 2056 ip6_sprintf(ip6bufg, &sin6->sin6_addr), 2057 ip6_sprintf(ip6bufm, &mask6.sin6_addr), 2058 rtflags, error)); 2059 2060 /* Save last error to return, see rtinit(). */ 2061 a_failure = error; 2062 continue; 2063 } 2064 2065 pr->ndpr_stateflags |= NDPRF_ONLINK; 2066 rt_routemsg(RTM_ADD, rt, pr->ndpr_ifp, 0, fibnum); 2067 RTFREE_FUNC(rt); 2068 } 2069 2070 /* Return the last error we got. */ 2071 return (a_failure); 2072 } 2073 2074 static int 2075 nd6_prefix_onlink(struct nd_prefix *pr) 2076 { 2077 struct epoch_tracker et; 2078 struct ifaddr *ifa; 2079 struct ifnet *ifp = pr->ndpr_ifp; 2080 struct nd_prefix *opr; 2081 char ip6buf[INET6_ADDRSTRLEN]; 2082 int error; 2083 2084 ND6_ONLINK_LOCK_ASSERT(); 2085 ND6_UNLOCK_ASSERT(); 2086 2087 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0) 2088 return (EEXIST); 2089 2090 /* 2091 * Add the interface route associated with the prefix. Before 2092 * installing the route, check if there's the same prefix on another 2093 * interface, and the prefix has already installed the interface route. 2094 * Although such a configuration is expected to be rare, we explicitly 2095 * allow it. 2096 */ 2097 ND6_RLOCK(); 2098 LIST_FOREACH(opr, &V_nd_prefix, ndpr_entry) { 2099 if (opr == pr) 2100 continue; 2101 2102 if ((opr->ndpr_stateflags & NDPRF_ONLINK) == 0) 2103 continue; 2104 2105 if (!V_rt_add_addr_allfibs && 2106 opr->ndpr_ifp->if_fib != pr->ndpr_ifp->if_fib) 2107 continue; 2108 2109 if (opr->ndpr_plen == pr->ndpr_plen && 2110 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr, 2111 &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen)) { 2112 ND6_RUNLOCK(); 2113 return (0); 2114 } 2115 } 2116 ND6_RUNLOCK(); 2117 2118 /* 2119 * We prefer link-local addresses as the associated interface address. 2120 */ 2121 /* search for a link-local addr */ 2122 NET_EPOCH_ENTER(et); 2123 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 2124 IN6_IFF_NOTREADY | IN6_IFF_ANYCAST); 2125 if (ifa == NULL) { 2126 /* XXX: freebsd does not have ifa_ifwithaf */ 2127 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2128 if (ifa->ifa_addr->sa_family == AF_INET6) { 2129 ifa_ref(ifa); 2130 break; 2131 } 2132 } 2133 /* should we care about ia6_flags? */ 2134 } 2135 NET_EPOCH_EXIT(et); 2136 if (ifa == NULL) { 2137 /* 2138 * This can still happen, when, for example, we receive an RA 2139 * containing a prefix with the L bit set and the A bit clear, 2140 * after removing all IPv6 addresses on the receiving 2141 * interface. This should, of course, be rare though. 2142 */ 2143 nd6log((LOG_NOTICE, 2144 "%s: failed to find any ifaddr to add route for a " 2145 "prefix(%s/%d) on %s\n", __func__, 2146 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr), 2147 pr->ndpr_plen, if_name(ifp))); 2148 return (0); 2149 } 2150 2151 error = nd6_prefix_onlink_rtrequest(pr, ifa); 2152 2153 if (ifa != NULL) 2154 ifa_free(ifa); 2155 2156 return (error); 2157 } 2158 2159 int 2160 nd6_prefix_offlink(struct nd_prefix *pr) 2161 { 2162 int error = 0; 2163 struct ifnet *ifp = pr->ndpr_ifp; 2164 struct nd_prefix *opr; 2165 struct sockaddr_in6 sa6, mask6; 2166 struct rtentry *rt; 2167 char ip6buf[INET6_ADDRSTRLEN]; 2168 uint64_t genid; 2169 int fibnum, maxfib, a_failure; 2170 2171 ND6_ONLINK_LOCK_ASSERT(); 2172 ND6_UNLOCK_ASSERT(); 2173 2174 if ((pr->ndpr_stateflags & NDPRF_ONLINK) == 0) 2175 return (EEXIST); 2176 2177 bzero(&sa6, sizeof(sa6)); 2178 sa6.sin6_family = AF_INET6; 2179 sa6.sin6_len = sizeof(sa6); 2180 bcopy(&pr->ndpr_prefix.sin6_addr, &sa6.sin6_addr, 2181 sizeof(struct in6_addr)); 2182 bzero(&mask6, sizeof(mask6)); 2183 mask6.sin6_family = AF_INET6; 2184 mask6.sin6_len = sizeof(sa6); 2185 bcopy(&pr->ndpr_mask, &mask6.sin6_addr, sizeof(struct in6_addr)); 2186 2187 if (V_rt_add_addr_allfibs) { 2188 fibnum = 0; 2189 maxfib = rt_numfibs; 2190 } else { 2191 fibnum = ifp->if_fib; 2192 maxfib = fibnum + 1; 2193 } 2194 2195 a_failure = 0; 2196 for (; fibnum < maxfib; fibnum++) { 2197 rt = NULL; 2198 error = in6_rtrequest(RTM_DELETE, (struct sockaddr *)&sa6, NULL, 2199 (struct sockaddr *)&mask6, 0, &rt, fibnum); 2200 if (error != 0) { 2201 /* Save last error to return, see rtinit(). */ 2202 a_failure = error; 2203 continue; 2204 } 2205 2206 /* report route deletion to the routing socket. */ 2207 rt_routemsg(RTM_DELETE, rt, ifp, 0, fibnum); 2208 RTFREE_FUNC(rt); 2209 } 2210 error = a_failure; 2211 a_failure = 1; 2212 if (error == 0) { 2213 pr->ndpr_stateflags &= ~NDPRF_ONLINK; 2214 2215 /* 2216 * There might be the same prefix on another interface, 2217 * the prefix which could not be on-link just because we have 2218 * the interface route (see comments in nd6_prefix_onlink). 2219 * If there's one, try to make the prefix on-link on the 2220 * interface. 2221 */ 2222 ND6_RLOCK(); 2223 restart: 2224 LIST_FOREACH(opr, &V_nd_prefix, ndpr_entry) { 2225 /* 2226 * KAME specific: detached prefixes should not be 2227 * on-link. 2228 */ 2229 if (opr == pr || (opr->ndpr_stateflags & 2230 (NDPRF_ONLINK | NDPRF_DETACHED)) != 0) 2231 continue; 2232 2233 if (opr->ndpr_plen == pr->ndpr_plen && 2234 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr, 2235 &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen)) { 2236 int e; 2237 2238 genid = V_nd6_list_genid; 2239 ND6_RUNLOCK(); 2240 if ((e = nd6_prefix_onlink(opr)) != 0) { 2241 nd6log((LOG_ERR, 2242 "%s: failed to recover a prefix " 2243 "%s/%d from %s to %s (errno=%d)\n", 2244 __func__, ip6_sprintf(ip6buf, 2245 &opr->ndpr_prefix.sin6_addr), 2246 opr->ndpr_plen, if_name(ifp), 2247 if_name(opr->ndpr_ifp), e)); 2248 } else 2249 a_failure = 0; 2250 ND6_RLOCK(); 2251 if (genid != V_nd6_list_genid) 2252 goto restart; 2253 } 2254 } 2255 ND6_RUNLOCK(); 2256 } else { 2257 /* XXX: can we still set the NDPRF_ONLINK flag? */ 2258 nd6log((LOG_ERR, 2259 "%s: failed to delete route: %s/%d on %s (errno=%d)\n", 2260 __func__, ip6_sprintf(ip6buf, &sa6.sin6_addr), 2261 pr->ndpr_plen, if_name(ifp), error)); 2262 } 2263 2264 if (a_failure) 2265 lltable_prefix_free(AF_INET6, (struct sockaddr *)&sa6, 2266 (struct sockaddr *)&mask6, LLE_STATIC); 2267 2268 return (error); 2269 } 2270 2271 /* 2272 * ia0 - corresponding public address 2273 */ 2274 int 2275 in6_tmpifadd(const struct in6_ifaddr *ia0, int forcegen, int delay) 2276 { 2277 struct ifnet *ifp = ia0->ia_ifa.ifa_ifp; 2278 struct in6_ifaddr *newia; 2279 struct in6_aliasreq ifra; 2280 int error; 2281 int trylimit = 3; /* XXX: adhoc value */ 2282 int updateflags; 2283 u_int32_t randid[2]; 2284 time_t vltime0, pltime0; 2285 2286 in6_prepare_ifra(&ifra, &ia0->ia_addr.sin6_addr, 2287 &ia0->ia_prefixmask.sin6_addr); 2288 2289 ifra.ifra_addr = ia0->ia_addr; /* XXX: do we need this ? */ 2290 /* clear the old IFID */ 2291 IN6_MASK_ADDR(&ifra.ifra_addr.sin6_addr, 2292 &ifra.ifra_prefixmask.sin6_addr); 2293 2294 again: 2295 if (in6_get_tmpifid(ifp, (u_int8_t *)randid, 2296 (const u_int8_t *)&ia0->ia_addr.sin6_addr.s6_addr[8], forcegen)) { 2297 nd6log((LOG_NOTICE, "%s: failed to find a good random IFID\n", 2298 __func__)); 2299 return (EINVAL); 2300 } 2301 ifra.ifra_addr.sin6_addr.s6_addr32[2] |= 2302 (randid[0] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[2])); 2303 ifra.ifra_addr.sin6_addr.s6_addr32[3] |= 2304 (randid[1] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[3])); 2305 2306 /* 2307 * in6_get_tmpifid() quite likely provided a unique interface ID. 2308 * However, we may still have a chance to see collision, because 2309 * there may be a time lag between generation of the ID and generation 2310 * of the address. So, we'll do one more sanity check. 2311 */ 2312 2313 if (in6_localip(&ifra.ifra_addr.sin6_addr) != 0) { 2314 if (trylimit-- > 0) { 2315 forcegen = 1; 2316 goto again; 2317 } 2318 2319 /* Give up. Something strange should have happened. */ 2320 nd6log((LOG_NOTICE, "%s: failed to find a unique random IFID\n", 2321 __func__)); 2322 return (EEXIST); 2323 } 2324 2325 /* 2326 * The Valid Lifetime is the lower of the Valid Lifetime of the 2327 * public address or TEMP_VALID_LIFETIME. 2328 * The Preferred Lifetime is the lower of the Preferred Lifetime 2329 * of the public address or TEMP_PREFERRED_LIFETIME - 2330 * DESYNC_FACTOR. 2331 */ 2332 if (ia0->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 2333 vltime0 = IFA6_IS_INVALID(ia0) ? 0 : 2334 (ia0->ia6_lifetime.ia6t_vltime - 2335 (time_uptime - ia0->ia6_updatetime)); 2336 if (vltime0 > V_ip6_temp_valid_lifetime) 2337 vltime0 = V_ip6_temp_valid_lifetime; 2338 } else 2339 vltime0 = V_ip6_temp_valid_lifetime; 2340 if (ia0->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 2341 pltime0 = IFA6_IS_DEPRECATED(ia0) ? 0 : 2342 (ia0->ia6_lifetime.ia6t_pltime - 2343 (time_uptime - ia0->ia6_updatetime)); 2344 if (pltime0 > V_ip6_temp_preferred_lifetime - V_ip6_desync_factor){ 2345 pltime0 = V_ip6_temp_preferred_lifetime - 2346 V_ip6_desync_factor; 2347 } 2348 } else 2349 pltime0 = V_ip6_temp_preferred_lifetime - V_ip6_desync_factor; 2350 ifra.ifra_lifetime.ia6t_vltime = vltime0; 2351 ifra.ifra_lifetime.ia6t_pltime = pltime0; 2352 2353 /* 2354 * A temporary address is created only if this calculated Preferred 2355 * Lifetime is greater than REGEN_ADVANCE time units. 2356 */ 2357 if (ifra.ifra_lifetime.ia6t_pltime <= V_ip6_temp_regen_advance) 2358 return (0); 2359 2360 /* XXX: scope zone ID? */ 2361 2362 ifra.ifra_flags |= (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY); 2363 2364 /* allocate ifaddr structure, link into chain, etc. */ 2365 updateflags = 0; 2366 if (delay) 2367 updateflags |= IN6_IFAUPDATE_DADDELAY; 2368 if ((error = in6_update_ifa(ifp, &ifra, NULL, updateflags)) != 0) 2369 return (error); 2370 2371 newia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr); 2372 if (newia == NULL) { /* XXX: can it happen? */ 2373 nd6log((LOG_ERR, 2374 "%s: ifa update succeeded, but we got no ifaddr\n", 2375 __func__)); 2376 return (EINVAL); /* XXX */ 2377 } 2378 newia->ia6_ndpr = ia0->ia6_ndpr; 2379 newia->ia6_ndpr->ndpr_addrcnt++; 2380 ifa_free(&newia->ia_ifa); 2381 2382 /* 2383 * A newly added address might affect the status of other addresses. 2384 * XXX: when the temporary address is generated with a new public 2385 * address, the onlink check is redundant. However, it would be safe 2386 * to do the check explicitly everywhere a new address is generated, 2387 * and, in fact, we surely need the check when we create a new 2388 * temporary address due to deprecation of an old temporary address. 2389 */ 2390 pfxlist_onlink_check(); 2391 2392 return (0); 2393 } 2394 2395 static int 2396 rt6_deleteroute(const struct rtentry *rt, const struct nhop_object *nh, 2397 void *arg) 2398 { 2399 struct in6_addr *gate = (struct in6_addr *)arg; 2400 int nh_rt_flags; 2401 2402 if (nh->gw_sa.sa_family != AF_INET6) 2403 return (0); 2404 2405 if (!IN6_ARE_ADDR_EQUAL(gate, &nh->gw6_sa.sin6_addr)) { 2406 return (0); 2407 } 2408 2409 /* 2410 * Do not delete a static route. 2411 * XXX: this seems to be a bit ad-hoc. Should we consider the 2412 * 'cloned' bit instead? 2413 */ 2414 nh_rt_flags = nhop_get_rtflags(nh); 2415 if ((nh_rt_flags & RTF_STATIC) != 0) 2416 return (0); 2417 2418 /* 2419 * We delete only host route. This means, in particular, we don't 2420 * delete default route. 2421 */ 2422 if ((nh_rt_flags & RTF_HOST) == 0) 2423 return (0); 2424 2425 return (1); 2426 #undef SIN6 2427 } 2428 2429 /* 2430 * Delete all the routing table entries that use the specified gateway. 2431 * XXX: this function causes search through all entries of routing table, so 2432 * it shouldn't be called when acting as a router. 2433 */ 2434 void 2435 rt6_flush(struct in6_addr *gateway, struct ifnet *ifp) 2436 { 2437 2438 /* We'll care only link-local addresses */ 2439 if (!IN6_IS_ADDR_LINKLOCAL(gateway)) 2440 return; 2441 2442 /* XXX Do we really need to walk any but the default FIB? */ 2443 rt_foreach_fib_walk_del(AF_INET6, rt6_deleteroute, (void *)gateway); 2444 } 2445 2446 int 2447 nd6_setdefaultiface(int ifindex) 2448 { 2449 int error = 0; 2450 2451 if (ifindex < 0 || V_if_index < ifindex) 2452 return (EINVAL); 2453 if (ifindex != 0 && !ifnet_byindex(ifindex)) 2454 return (EINVAL); 2455 2456 if (V_nd6_defifindex != ifindex) { 2457 V_nd6_defifindex = ifindex; 2458 if (V_nd6_defifindex > 0) 2459 V_nd6_defifp = ifnet_byindex(V_nd6_defifindex); 2460 else 2461 V_nd6_defifp = NULL; 2462 2463 /* 2464 * Our current implementation assumes one-to-one maping between 2465 * interfaces and links, so it would be natural to use the 2466 * default interface as the default link. 2467 */ 2468 scope6_setdefault(V_nd6_defifp); 2469 } 2470 2471 return (error); 2472 } 2473 2474 bool 2475 nd6_defrouter_list_empty(void) 2476 { 2477 2478 return (TAILQ_EMPTY(&V_nd6_defrouter)); 2479 } 2480 2481 void 2482 nd6_defrouter_timer(void) 2483 { 2484 struct nd_defrouter *dr, *ndr; 2485 struct nd6_drhead drq; 2486 2487 TAILQ_INIT(&drq); 2488 2489 ND6_WLOCK(); 2490 TAILQ_FOREACH_SAFE(dr, &V_nd6_defrouter, dr_entry, ndr) 2491 if (dr->expire && dr->expire < time_uptime) 2492 defrouter_unlink(dr, &drq); 2493 ND6_WUNLOCK(); 2494 2495 while ((dr = TAILQ_FIRST(&drq)) != NULL) { 2496 TAILQ_REMOVE(&drq, dr, dr_entry); 2497 defrouter_del(dr); 2498 } 2499 } 2500 2501 /* 2502 * Nuke default router list entries toward ifp. 2503 * We defer removal of default router list entries that is installed in the 2504 * routing table, in order to keep additional side effects as small as possible. 2505 */ 2506 void 2507 nd6_defrouter_purge(struct ifnet *ifp) 2508 { 2509 struct nd_defrouter *dr, *ndr; 2510 struct nd6_drhead drq; 2511 2512 TAILQ_INIT(&drq); 2513 2514 ND6_WLOCK(); 2515 TAILQ_FOREACH_SAFE(dr, &V_nd6_defrouter, dr_entry, ndr) { 2516 if (dr->installed) 2517 continue; 2518 if (dr->ifp == ifp) 2519 defrouter_unlink(dr, &drq); 2520 } 2521 TAILQ_FOREACH_SAFE(dr, &V_nd6_defrouter, dr_entry, ndr) { 2522 if (!dr->installed) 2523 continue; 2524 if (dr->ifp == ifp) 2525 defrouter_unlink(dr, &drq); 2526 } 2527 ND6_WUNLOCK(); 2528 2529 /* Delete the unlinked router objects. */ 2530 while ((dr = TAILQ_FIRST(&drq)) != NULL) { 2531 TAILQ_REMOVE(&drq, dr, dr_entry); 2532 defrouter_del(dr); 2533 } 2534 } 2535 2536 void 2537 nd6_defrouter_flush_all(void) 2538 { 2539 struct nd_defrouter *dr; 2540 struct nd6_drhead drq; 2541 2542 TAILQ_INIT(&drq); 2543 2544 ND6_WLOCK(); 2545 while ((dr = TAILQ_FIRST(&V_nd6_defrouter)) != NULL) 2546 defrouter_unlink(dr, &drq); 2547 ND6_WUNLOCK(); 2548 2549 while ((dr = TAILQ_FIRST(&drq)) != NULL) { 2550 TAILQ_REMOVE(&drq, dr, dr_entry); 2551 defrouter_del(dr); 2552 } 2553 } 2554 2555 void 2556 nd6_defrouter_init(void) 2557 { 2558 2559 TAILQ_INIT(&V_nd6_defrouter); 2560 } 2561 2562 static int 2563 nd6_sysctl_drlist(SYSCTL_HANDLER_ARGS) 2564 { 2565 struct in6_defrouter d; 2566 struct nd_defrouter *dr; 2567 int error; 2568 2569 if (req->newptr != NULL) 2570 return (EPERM); 2571 2572 error = sysctl_wire_old_buffer(req, 0); 2573 if (error != 0) 2574 return (error); 2575 2576 bzero(&d, sizeof(d)); 2577 d.rtaddr.sin6_family = AF_INET6; 2578 d.rtaddr.sin6_len = sizeof(d.rtaddr); 2579 2580 ND6_RLOCK(); 2581 TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry) { 2582 d.rtaddr.sin6_addr = dr->rtaddr; 2583 error = sa6_recoverscope(&d.rtaddr); 2584 if (error != 0) 2585 break; 2586 d.flags = dr->raflags; 2587 d.rtlifetime = dr->rtlifetime; 2588 d.expire = dr->expire + (time_second - time_uptime); 2589 d.if_index = dr->ifp->if_index; 2590 error = SYSCTL_OUT(req, &d, sizeof(d)); 2591 if (error != 0) 2592 break; 2593 } 2594 ND6_RUNLOCK(); 2595 return (error); 2596 } 2597 SYSCTL_PROC(_net_inet6_icmp6, ICMPV6CTL_ND6_DRLIST, nd6_drlist, 2598 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE, 2599 NULL, 0, nd6_sysctl_drlist, "S,in6_defrouter", 2600 "NDP default router list"); 2601