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#include "opt_inet.h" 36#include "opt_inet6.h" 37 38#include <sys/param.h> 39#include <sys/systm.h> 40#include <sys/malloc.h> 41#include <sys/mbuf.h> 42#include <sys/refcount.h> 43#include <sys/socket.h> 44#include <sys/sockio.h> 45#include <sys/time.h> 46#include <sys/kernel.h> 47#include <sys/lock.h> 48#include <sys/errno.h> 49#include <sys/rmlock.h> 50#include <sys/rwlock.h> 51#include <sys/sysctl.h> 52#include <sys/syslog.h> 53#include <sys/queue.h> 54 55#include <net/if.h> 56#include <net/if_var.h> 57#include <net/if_private.h> 58#include <net/if_types.h> 59#include <net/if_dl.h> 60#include <net/route.h> 61#include <net/route/nhop.h> 62#include <net/route/route_ctl.h> 63#include <net/radix.h> 64#include <net/vnet.h> 65 66#include <netinet/in.h> 67#include <net/if_llatbl.h> 68#include <netinet6/in6_var.h> 69#include <netinet6/in6_ifattach.h> 70#include <netinet/ip6.h> 71#include <netinet6/ip6_var.h> 72#include <netinet6/nd6.h> 73#include <netinet/icmp6.h> 74#include <netinet6/scope6_var.h> 75 76static struct nd_defrouter *defrtrlist_update(struct nd_defrouter *); 77static int prelist_update(struct nd_prefixctl *, struct nd_defrouter *, 78 struct mbuf *, int); 79static int nd6_prefix_onlink(struct nd_prefix *); 80 81TAILQ_HEAD(nd6_drhead, nd_defrouter); 82VNET_DEFINE_STATIC(struct nd6_drhead, nd6_defrouter); 83#define V_nd6_defrouter VNET(nd6_defrouter) 84 85VNET_DECLARE(int, nd6_recalc_reachtm_interval); 86#define V_nd6_recalc_reachtm_interval VNET(nd6_recalc_reachtm_interval) 87 88VNET_DEFINE_STATIC(struct ifnet *, nd6_defifp); 89VNET_DEFINE(int, nd6_defifindex); 90#define V_nd6_defifp VNET(nd6_defifp) 91 92VNET_DEFINE(int, ip6_use_tempaddr) = 0; 93 94VNET_DEFINE(int, ip6_desync_factor); 95VNET_DEFINE(u_int32_t, ip6_temp_preferred_lifetime) = DEF_TEMP_PREFERRED_LIFETIME; 96VNET_DEFINE(u_int32_t, ip6_temp_valid_lifetime) = DEF_TEMP_VALID_LIFETIME; 97 98VNET_DEFINE(int, ip6_temp_regen_advance) = TEMPADDR_REGEN_ADVANCE; 99 100#ifdef EXPERIMENTAL 101VNET_DEFINE_STATIC(int, nd6_ignore_ipv6_only_ra) = 1; 102#define V_nd6_ignore_ipv6_only_ra VNET(nd6_ignore_ipv6_only_ra) 103SYSCTL_INT(_net_inet6_icmp6, OID_AUTO, 104 nd6_ignore_ipv6_only_ra, CTLFLAG_VNET | CTLFLAG_RW, 105 &VNET_NAME(nd6_ignore_ipv6_only_ra), 0, 106 "Ignore the 'IPv6-Only flag' in RA messages in compliance with " 107 "draft-ietf-6man-ipv6only-flag"); 108#endif 109 110/* RTPREF_MEDIUM has to be 0! */ 111#define RTPREF_HIGH 1 112#define RTPREF_MEDIUM 0 113#define RTPREF_LOW (-1) 114#define RTPREF_RESERVED (-2) 115#define RTPREF_INVALID (-3) /* internal */ 116 117static void 118defrouter_ref(struct nd_defrouter *dr) 119{ 120 121 refcount_acquire(&dr->refcnt); 122} 123 124void 125defrouter_rele(struct nd_defrouter *dr) 126{ 127 128 if (refcount_release(&dr->refcnt)) 129 free(dr, M_IP6NDP); 130} 131 132/* 133 * Remove a router from the global list and optionally stash it in a 134 * caller-supplied queue. 135 */ 136static void 137defrouter_unlink(struct nd_defrouter *dr, struct nd6_drhead *drq) 138{ 139 140 ND6_WLOCK_ASSERT(); 141 142 TAILQ_REMOVE(&V_nd6_defrouter, dr, dr_entry); 143 V_nd6_list_genid++; 144 if (drq != NULL) 145 TAILQ_INSERT_TAIL(drq, dr, dr_entry); 146} 147 148/* 149 * Receive Router Solicitation Message - just for routers. 150 * Router solicitation/advertisement is mostly managed by userland program 151 * (rtadvd) so here we have no function like nd6_ra_output(). 152 * 153 * Based on RFC 2461 154 */ 155void 156nd6_rs_input(struct mbuf *m, int off, int icmp6len) 157{ 158 struct ifnet *ifp; 159 struct ip6_hdr *ip6; 160 struct nd_router_solicit *nd_rs; 161 struct in6_addr saddr6; 162 union nd_opts ndopts; 163 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 164 char *lladdr; 165 int lladdrlen; 166 167 ifp = m->m_pkthdr.rcvif; 168 169 /* 170 * Accept RS only when V_ip6_forwarding=1 and the interface has 171 * no ND6_IFF_ACCEPT_RTADV. 172 */ 173 if (!V_ip6_forwarding || ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV) 174 goto freeit; 175 176 /* RFC 6980: Nodes MUST silently ignore fragments */ 177 if(m->m_flags & M_FRAGMENTED) 178 goto freeit; 179 180 /* Sanity checks */ 181 ip6 = mtod(m, struct ip6_hdr *); 182 if (__predict_false(ip6->ip6_hlim != 255)) { 183 ICMP6STAT_INC(icp6s_invlhlim); 184 nd6log((LOG_ERR, 185 "%s: invalid hlim (%d) from %s to %s on %s\n", __func__, 186 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src), 187 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp))); 188 goto bad; 189 } 190 191 /* 192 * Don't update the neighbor cache, if src = ::. 193 * This indicates that the src has no IP address assigned yet. 194 */ 195 saddr6 = ip6->ip6_src; 196 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) 197 goto freeit; 198 199 if (m->m_len < off + icmp6len) { 200 m = m_pullup(m, off + icmp6len); 201 if (m == NULL) { 202 IP6STAT_INC(ip6s_exthdrtoolong); 203 return; 204 } 205 } 206 ip6 = mtod(m, struct ip6_hdr *); 207 nd_rs = (struct nd_router_solicit *)((caddr_t)ip6 + off); 208 209 icmp6len -= sizeof(*nd_rs); 210 nd6_option_init(nd_rs + 1, icmp6len, &ndopts); 211 if (nd6_options(&ndopts) < 0) { 212 nd6log((LOG_INFO, 213 "%s: invalid ND option, ignored\n", __func__)); 214 /* nd6_options have incremented stats */ 215 goto freeit; 216 } 217 218 lladdr = NULL; 219 lladdrlen = 0; 220 if (ndopts.nd_opts_src_lladdr) { 221 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1); 222 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3; 223 } 224 225 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 226 nd6log((LOG_INFO, 227 "%s: lladdrlen mismatch for %s (if %d, RS packet %d)\n", 228 __func__, ip6_sprintf(ip6bufs, &saddr6), 229 ifp->if_addrlen, lladdrlen - 2)); 230 goto bad; 231 } 232 233 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_SOLICIT, 0); 234 235 freeit: 236 m_freem(m); 237 return; 238 239 bad: 240 ICMP6STAT_INC(icp6s_badrs); 241 m_freem(m); 242} 243 244#ifdef EXPERIMENTAL 245/* 246 * An initial update routine for draft-ietf-6man-ipv6only-flag. 247 * We need to iterate over all default routers for the given 248 * interface to see whether they are all advertising the "S" 249 * (IPv6-Only) flag. If they do set, otherwise unset, the 250 * interface flag we later use to filter on. 251 */ 252static void 253defrtr_ipv6_only_ifp(struct ifnet *ifp) 254{ 255 struct nd_defrouter *dr; 256 bool ipv6_only, ipv6_only_old; 257#ifdef INET 258 struct epoch_tracker et; 259 struct ifaddr *ifa; 260 bool has_ipv4_addr; 261#endif 262 263 if (V_nd6_ignore_ipv6_only_ra != 0) 264 return; 265 266 ipv6_only = true; 267 ND6_RLOCK(); 268 TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry) 269 if (dr->ifp == ifp && 270 (dr->raflags & ND_RA_FLAG_IPV6_ONLY) == 0) 271 ipv6_only = false; 272 ND6_RUNLOCK(); 273 274 IF_AFDATA_WLOCK(ifp); 275 ipv6_only_old = ND_IFINFO(ifp)->flags & ND6_IFF_IPV6_ONLY; 276 IF_AFDATA_WUNLOCK(ifp); 277 278 /* If nothing changed, we have an early exit. */ 279 if (ipv6_only == ipv6_only_old) 280 return; 281 282#ifdef INET 283 /* 284 * Should we want to set the IPV6-ONLY flag, check if the 285 * interface has a non-0/0 and non-link-local IPv4 address 286 * configured on it. If it has we will assume working 287 * IPv4 operations and will clear the interface flag. 288 */ 289 has_ipv4_addr = false; 290 if (ipv6_only) { 291 NET_EPOCH_ENTER(et); 292 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 293 if (ifa->ifa_addr->sa_family != AF_INET) 294 continue; 295 if (in_canforward( 296 satosin(ifa->ifa_addr)->sin_addr)) { 297 has_ipv4_addr = true; 298 break; 299 } 300 } 301 NET_EPOCH_EXIT(et); 302 } 303 if (ipv6_only && has_ipv4_addr) { 304 log(LOG_NOTICE, "%s rcvd RA w/ IPv6-Only flag set but has IPv4 " 305 "configured, ignoring IPv6-Only flag.\n", ifp->if_xname); 306 ipv6_only = false; 307 } 308#endif 309 310 IF_AFDATA_WLOCK(ifp); 311 if (ipv6_only) 312 ND_IFINFO(ifp)->flags |= ND6_IFF_IPV6_ONLY; 313 else 314 ND_IFINFO(ifp)->flags &= ~ND6_IFF_IPV6_ONLY; 315 IF_AFDATA_WUNLOCK(ifp); 316 317#ifdef notyet 318 /* Send notification of flag change. */ 319#endif 320} 321 322static void 323defrtr_ipv6_only_ipf_down(struct ifnet *ifp) 324{ 325 326 IF_AFDATA_WLOCK(ifp); 327 ND_IFINFO(ifp)->flags &= ~ND6_IFF_IPV6_ONLY; 328 IF_AFDATA_WUNLOCK(ifp); 329} 330#endif /* EXPERIMENTAL */ 331 332void 333nd6_ifnet_link_event(void *arg __unused, struct ifnet *ifp, int linkstate) 334{ 335 336 /* 337 * XXX-BZ we might want to trigger re-evaluation of our default router 338 * availability. E.g., on link down the default router might be 339 * unreachable but a different interface might still have connectivity. 340 */ 341 342#ifdef EXPERIMENTAL 343 if (linkstate == LINK_STATE_DOWN) 344 defrtr_ipv6_only_ipf_down(ifp); 345#endif 346} 347 348/* 349 * Receive Router Advertisement Message. 350 * 351 * Based on RFC 2461 352 * TODO: on-link bit on prefix information 353 * TODO: ND_RA_FLAG_{OTHER,MANAGED} processing 354 */ 355void 356nd6_ra_input(struct mbuf *m, int off, int icmp6len) 357{ 358 struct ifnet *ifp; 359 struct nd_ifinfo *ndi; 360 struct ip6_hdr *ip6; 361 struct nd_router_advert *nd_ra; 362 struct in6_addr saddr6; 363 struct nd_defrouter *dr; 364 union nd_opts ndopts; 365 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 366 int mcast; 367 368 /* 369 * We only accept RAs only when the per-interface flag 370 * ND6_IFF_ACCEPT_RTADV is on the receiving interface. 371 */ 372 ifp = m->m_pkthdr.rcvif; 373 ndi = ND_IFINFO(ifp); 374 if (!(ndi->flags & ND6_IFF_ACCEPT_RTADV)) 375 goto freeit; 376 377 /* RFC 6980: Nodes MUST silently ignore fragments */ 378 if(m->m_flags & M_FRAGMENTED) 379 goto freeit; 380 381 ip6 = mtod(m, struct ip6_hdr *); 382 if (__predict_false(ip6->ip6_hlim != 255)) { 383 ICMP6STAT_INC(icp6s_invlhlim); 384 nd6log((LOG_ERR, 385 "%s: invalid hlim (%d) from %s to %s on %s\n", __func__, 386 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src), 387 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp))); 388 goto bad; 389 } 390 391 saddr6 = ip6->ip6_src; 392 if (!IN6_IS_ADDR_LINKLOCAL(&saddr6)) { 393 nd6log((LOG_ERR, 394 "%s: src %s is not link-local\n", __func__, 395 ip6_sprintf(ip6bufs, &saddr6))); 396 goto bad; 397 } 398 399 if (m->m_len < off + icmp6len) { 400 m = m_pullup(m, off + icmp6len); 401 if (m == NULL) { 402 IP6STAT_INC(ip6s_exthdrtoolong); 403 return; 404 } 405 } 406 ip6 = mtod(m, struct ip6_hdr *); 407 nd_ra = (struct nd_router_advert *)((caddr_t)ip6 + off); 408 409 icmp6len -= sizeof(*nd_ra); 410 nd6_option_init(nd_ra + 1, icmp6len, &ndopts); 411 if (nd6_options(&ndopts) < 0) { 412 nd6log((LOG_INFO, 413 "%s: invalid ND option, ignored\n", __func__)); 414 /* nd6_options have incremented stats */ 415 goto freeit; 416 } 417 418 mcast = 0; 419 dr = NULL; 420 { 421 struct nd_defrouter dr0; 422 u_int32_t advreachable = nd_ra->nd_ra_reachable; 423 424 /* remember if this is a multicasted advertisement */ 425 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) 426 mcast = 1; 427 428 bzero(&dr0, sizeof(dr0)); 429 dr0.rtaddr = saddr6; 430 dr0.raflags = nd_ra->nd_ra_flags_reserved; 431 /* 432 * Effectively-disable routes from RA messages when 433 * ND6_IFF_NO_RADR enabled on the receiving interface or 434 * (ip6.forwarding == 1 && ip6.rfc6204w3 != 1). 435 */ 436 if (ndi->flags & ND6_IFF_NO_RADR) 437 dr0.rtlifetime = 0; 438 else if (V_ip6_forwarding && !V_ip6_rfc6204w3) 439 dr0.rtlifetime = 0; 440 else 441 dr0.rtlifetime = ntohs(nd_ra->nd_ra_router_lifetime); 442 dr0.expire = time_uptime + dr0.rtlifetime; 443 dr0.ifp = ifp; 444 /* unspecified or not? (RFC 2461 6.3.4) */ 445 if (advreachable) { 446 advreachable = ntohl(advreachable); 447 if (advreachable <= MAX_REACHABLE_TIME && 448 ndi->basereachable != advreachable) { 449 ndi->basereachable = advreachable; 450 ndi->reachable = ND_COMPUTE_RTIME(ndi->basereachable); 451 ndi->recalctm = V_nd6_recalc_reachtm_interval; /* reset */ 452 } 453 } 454 if (nd_ra->nd_ra_retransmit) 455 ndi->retrans = ntohl(nd_ra->nd_ra_retransmit); 456 if (nd_ra->nd_ra_curhoplimit) { 457 if (ndi->chlim < nd_ra->nd_ra_curhoplimit) 458 ndi->chlim = nd_ra->nd_ra_curhoplimit; 459 else if (ndi->chlim != nd_ra->nd_ra_curhoplimit) { 460 log(LOG_ERR, "RA with a lower CurHopLimit sent from " 461 "%s on %s (current = %d, received = %d). " 462 "Ignored.\n", ip6_sprintf(ip6bufs, &ip6->ip6_src), 463 if_name(ifp), ndi->chlim, nd_ra->nd_ra_curhoplimit); 464 } 465 } 466 dr = defrtrlist_update(&dr0); 467#ifdef EXPERIMENTAL 468 defrtr_ipv6_only_ifp(ifp); 469#endif 470 } 471 472 /* 473 * prefix 474 */ 475 if (ndopts.nd_opts_pi) { 476 struct nd_opt_hdr *pt; 477 struct nd_opt_prefix_info *pi = NULL; 478 struct nd_prefixctl pr; 479 480 for (pt = (struct nd_opt_hdr *)ndopts.nd_opts_pi; 481 pt <= (struct nd_opt_hdr *)ndopts.nd_opts_pi_end; 482 pt = (struct nd_opt_hdr *)((caddr_t)pt + 483 (pt->nd_opt_len << 3))) { 484 if (pt->nd_opt_type != ND_OPT_PREFIX_INFORMATION) 485 continue; 486 pi = (struct nd_opt_prefix_info *)pt; 487 488 if (pi->nd_opt_pi_len != 4) { 489 nd6log((LOG_INFO, 490 "%s: invalid option len %d for prefix " 491 "information option, ignored\n", __func__, 492 pi->nd_opt_pi_len)); 493 continue; 494 } 495 496 if (128 < pi->nd_opt_pi_prefix_len) { 497 nd6log((LOG_INFO, 498 "%s: invalid prefix len %d for prefix " 499 "information option, ignored\n", __func__, 500 pi->nd_opt_pi_prefix_len)); 501 continue; 502 } 503 504 if (IN6_IS_ADDR_MULTICAST(&pi->nd_opt_pi_prefix) 505 || IN6_IS_ADDR_LINKLOCAL(&pi->nd_opt_pi_prefix)) { 506 nd6log((LOG_INFO, 507 "%s: invalid prefix %s, ignored\n", 508 __func__, ip6_sprintf(ip6bufs, 509 &pi->nd_opt_pi_prefix))); 510 continue; 511 } 512 513 bzero(&pr, sizeof(pr)); 514 pr.ndpr_prefix.sin6_family = AF_INET6; 515 pr.ndpr_prefix.sin6_len = sizeof(pr.ndpr_prefix); 516 pr.ndpr_prefix.sin6_addr = pi->nd_opt_pi_prefix; 517 pr.ndpr_ifp = (struct ifnet *)m->m_pkthdr.rcvif; 518 519 pr.ndpr_raf_onlink = (pi->nd_opt_pi_flags_reserved & 520 ND_OPT_PI_FLAG_ONLINK) ? 1 : 0; 521 pr.ndpr_raf_auto = (pi->nd_opt_pi_flags_reserved & 522 ND_OPT_PI_FLAG_AUTO) ? 1 : 0; 523 pr.ndpr_raf_ra_derived = 1; 524 pr.ndpr_plen = pi->nd_opt_pi_prefix_len; 525 pr.ndpr_vltime = ntohl(pi->nd_opt_pi_valid_time); 526 pr.ndpr_pltime = ntohl(pi->nd_opt_pi_preferred_time); 527 (void)prelist_update(&pr, dr, m, mcast); 528 } 529 } 530 if (dr != NULL) { 531 defrouter_rele(dr); 532 dr = NULL; 533 } 534 535 /* 536 * MTU 537 */ 538 if (ndopts.nd_opts_mtu && ndopts.nd_opts_mtu->nd_opt_mtu_len == 1) { 539 u_long mtu; 540 u_long maxmtu; 541 542 mtu = (u_long)ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu); 543 544 /* lower bound */ 545 if (mtu < IPV6_MMTU) { 546 nd6log((LOG_INFO, "%s: bogus mtu option mtu=%lu sent " 547 "from %s, ignoring\n", __func__, 548 mtu, ip6_sprintf(ip6bufs, &ip6->ip6_src))); 549 goto skip; 550 } 551 552 /* upper bound */ 553 maxmtu = (ndi->maxmtu && ndi->maxmtu < ifp->if_mtu) 554 ? ndi->maxmtu : ifp->if_mtu; 555 if (mtu <= maxmtu) { 556 int change = (ndi->linkmtu != mtu); 557 558 ndi->linkmtu = mtu; 559 if (change) { 560 /* in6_maxmtu may change */ 561 in6_setmaxmtu(); 562 rt_updatemtu(ifp); 563 } 564 } else { 565 nd6log((LOG_INFO, "%s: bogus mtu=%lu sent from %s; " 566 "exceeds maxmtu %lu, ignoring\n", __func__, 567 mtu, ip6_sprintf(ip6bufs, &ip6->ip6_src), maxmtu)); 568 } 569 } 570 571 skip: 572 573 /* 574 * Source link layer address 575 */ 576 { 577 char *lladdr = NULL; 578 int lladdrlen = 0; 579 580 if (ndopts.nd_opts_src_lladdr) { 581 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1); 582 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3; 583 } 584 585 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 586 nd6log((LOG_INFO, 587 "%s: lladdrlen mismatch for %s (if %d, RA packet %d)\n", 588 __func__, ip6_sprintf(ip6bufs, &saddr6), 589 ifp->if_addrlen, lladdrlen - 2)); 590 goto bad; 591 } 592 593 nd6_cache_lladdr(ifp, &saddr6, lladdr, 594 lladdrlen, ND_ROUTER_ADVERT, 0); 595 596 /* 597 * Installing a link-layer address might change the state of the 598 * router's neighbor cache, which might also affect our on-link 599 * detection of adveritsed prefixes. 600 */ 601 pfxlist_onlink_check(); 602 } 603 604 freeit: 605 m_freem(m); 606 return; 607 608 bad: 609 ICMP6STAT_INC(icp6s_badra); 610 m_freem(m); 611} 612 613/* PFXRTR */ 614static struct nd_pfxrouter * 615pfxrtr_lookup(struct nd_prefix *pr, struct nd_defrouter *dr) 616{ 617 struct nd_pfxrouter *search; 618 619 ND6_LOCK_ASSERT(); 620 621 LIST_FOREACH(search, &pr->ndpr_advrtrs, pfr_entry) { 622 if (search->router == dr) 623 break; 624 } 625 return (search); 626} 627 628static void 629pfxrtr_add(struct nd_prefix *pr, struct nd_defrouter *dr) 630{ 631 struct nd_pfxrouter *new; 632 bool update; 633 634 ND6_UNLOCK_ASSERT(); 635 636 ND6_RLOCK(); 637 if (pfxrtr_lookup(pr, dr) != NULL) { 638 ND6_RUNLOCK(); 639 return; 640 } 641 ND6_RUNLOCK(); 642 643 new = malloc(sizeof(*new), M_IP6NDP, M_NOWAIT | M_ZERO); 644 if (new == NULL) 645 return; 646 defrouter_ref(dr); 647 new->router = dr; 648 649 ND6_WLOCK(); 650 if (pfxrtr_lookup(pr, dr) == NULL) { 651 LIST_INSERT_HEAD(&pr->ndpr_advrtrs, new, pfr_entry); 652 update = true; 653 } else { 654 /* We lost a race to add the reference. */ 655 defrouter_rele(dr); 656 free(new, M_IP6NDP); 657 update = false; 658 } 659 ND6_WUNLOCK(); 660 661 if (update) 662 pfxlist_onlink_check(); 663} 664 665static void 666pfxrtr_del(struct nd_pfxrouter *pfr) 667{ 668 669 ND6_WLOCK_ASSERT(); 670 671 LIST_REMOVE(pfr, pfr_entry); 672 defrouter_rele(pfr->router); 673 free(pfr, M_IP6NDP); 674} 675 676/* Default router list processing sub routines. */ 677static void 678defrouter_addreq(struct nd_defrouter *new) 679{ 680 uint32_t fibnum = new->ifp->if_fib; 681 struct rib_cmd_info rc = {}; 682 int error = 0; 683 684 NET_EPOCH_ASSERT(); 685 686 struct sockaddr_in6 gw = { 687 .sin6_family = AF_INET6, 688 .sin6_len = sizeof(struct sockaddr_in6), 689 .sin6_addr = new->rtaddr, 690 }; 691 692 error = rib_add_default_route(fibnum, AF_INET6, new->ifp, 693 (struct sockaddr *)&gw, &rc); 694 695 if (error == 0) { 696 struct nhop_object *nh = nhop_select_func(rc.rc_nh_new, 0); 697 rt_routemsg(RTM_ADD, rc.rc_rt, nh, fibnum); 698 new->installed = 1; 699 } 700} 701 702/* 703 * Remove the default route for a given router. 704 * This is just a subroutine function for defrouter_select_fib(), and 705 * should not be called from anywhere else. 706 */ 707static void 708defrouter_delreq(struct nd_defrouter *dr) 709{ 710 uint32_t fibnum = dr->ifp->if_fib; 711 struct epoch_tracker et; 712 struct rib_cmd_info rc; 713 int error; 714 715 struct sockaddr_in6 dst = { 716 .sin6_family = AF_INET6, 717 .sin6_len = sizeof(struct sockaddr_in6), 718 }; 719 720 struct sockaddr_in6 gw = { 721 .sin6_family = AF_INET6, 722 .sin6_len = sizeof(struct sockaddr_in6), 723 .sin6_addr = dr->rtaddr, 724 }; 725 726 NET_EPOCH_ENTER(et); 727 error = rib_del_route_px(fibnum, (struct sockaddr *)&dst, 0, 728 rib_match_gw, (struct sockaddr *)&gw, 0, &rc); 729 if (error == 0) { 730 struct nhop_object *nh = nhop_select_func(rc.rc_nh_old, 0); 731 rt_routemsg(RTM_DELETE, rc.rc_rt, nh, fibnum); 732 } 733 NET_EPOCH_EXIT(et); 734 735 dr->installed = 0; 736} 737 738static void 739defrouter_del(struct nd_defrouter *dr) 740{ 741 struct nd_defrouter *deldr = NULL; 742 struct nd_prefix *pr; 743 struct nd_pfxrouter *pfxrtr; 744 745 ND6_UNLOCK_ASSERT(); 746 747 /* 748 * Flush all the routing table entries that use the router 749 * as a next hop. 750 */ 751 if (ND_IFINFO(dr->ifp)->flags & ND6_IFF_ACCEPT_RTADV) 752 rt6_flush(&dr->rtaddr, dr->ifp); 753 754#ifdef EXPERIMENTAL 755 defrtr_ipv6_only_ifp(dr->ifp); 756#endif 757 758 if (dr->installed) { 759 deldr = dr; 760 defrouter_delreq(dr); 761 } 762 763 /* 764 * Also delete all the pointers to the router in each prefix lists. 765 */ 766 ND6_WLOCK(); 767 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) { 768 if ((pfxrtr = pfxrtr_lookup(pr, dr)) != NULL) 769 pfxrtr_del(pfxrtr); 770 } 771 ND6_WUNLOCK(); 772 773 pfxlist_onlink_check(); 774 775 /* 776 * If the router is the primary one, choose a new one. 777 * Note that defrouter_select_fib() will remove the current 778 * gateway from the routing table. 779 */ 780 if (deldr) 781 defrouter_select_fib(deldr->ifp->if_fib); 782 783 /* 784 * Release the list reference. 785 */ 786 defrouter_rele(dr); 787} 788 789struct nd_defrouter * 790defrouter_lookup_locked(const struct in6_addr *addr, struct ifnet *ifp) 791{ 792 struct nd_defrouter *dr; 793 794 ND6_LOCK_ASSERT(); 795 TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry) 796 if (dr->ifp == ifp && IN6_ARE_ADDR_EQUAL(addr, &dr->rtaddr)) { 797 defrouter_ref(dr); 798 return (dr); 799 } 800 return (NULL); 801} 802 803struct nd_defrouter * 804defrouter_lookup(const struct in6_addr *addr, struct ifnet *ifp) 805{ 806 struct nd_defrouter *dr; 807 808 ND6_RLOCK(); 809 dr = defrouter_lookup_locked(addr, ifp); 810 ND6_RUNLOCK(); 811 return (dr); 812} 813 814/* 815 * Remove all default routes from default router list. 816 */ 817void 818defrouter_reset(void) 819{ 820 struct nd_defrouter *dr, **dra; 821 int count, i; 822 823 count = i = 0; 824 825 /* 826 * We can't delete routes with the ND lock held, so make a copy of the 827 * current default router list and use that when deleting routes. 828 */ 829 ND6_RLOCK(); 830 TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry) 831 count++; 832 ND6_RUNLOCK(); 833 834 dra = malloc(count * sizeof(*dra), M_TEMP, M_WAITOK | M_ZERO); 835 836 ND6_RLOCK(); 837 TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry) { 838 if (i == count) 839 break; 840 defrouter_ref(dr); 841 dra[i++] = dr; 842 } 843 ND6_RUNLOCK(); 844 845 for (i = 0; i < count && dra[i] != NULL; i++) { 846 defrouter_delreq(dra[i]); 847 defrouter_rele(dra[i]); 848 } 849 free(dra, M_TEMP); 850 851 /* 852 * XXX should we also nuke any default routers in the kernel, by 853 * going through them by rtalloc1()? 854 */ 855} 856 857/* 858 * Look up a matching default router list entry and remove it. Returns true if a 859 * matching entry was found, false otherwise. 860 */ 861bool 862defrouter_remove(struct in6_addr *addr, struct ifnet *ifp) 863{ 864 struct nd_defrouter *dr; 865 866 ND6_WLOCK(); 867 dr = defrouter_lookup_locked(addr, ifp); 868 if (dr == NULL) { 869 ND6_WUNLOCK(); 870 return (false); 871 } 872 873 defrouter_unlink(dr, NULL); 874 ND6_WUNLOCK(); 875 defrouter_del(dr); 876 defrouter_rele(dr); 877 return (true); 878} 879 880/* 881 * for default router selection 882 * regards router-preference field as a 2-bit signed integer 883 */ 884static int 885rtpref(struct nd_defrouter *dr) 886{ 887 switch (dr->raflags & ND_RA_FLAG_RTPREF_MASK) { 888 case ND_RA_FLAG_RTPREF_HIGH: 889 return (RTPREF_HIGH); 890 case ND_RA_FLAG_RTPREF_MEDIUM: 891 case ND_RA_FLAG_RTPREF_RSV: 892 return (RTPREF_MEDIUM); 893 case ND_RA_FLAG_RTPREF_LOW: 894 return (RTPREF_LOW); 895 default: 896 /* 897 * This case should never happen. If it did, it would mean a 898 * serious bug of kernel internal. We thus always bark here. 899 * Or, can we even panic? 900 */ 901 log(LOG_ERR, "rtpref: impossible RA flag %x\n", dr->raflags); 902 return (RTPREF_INVALID); 903 } 904 /* NOTREACHED */ 905} 906 907static bool 908is_dr_reachable(const struct nd_defrouter *dr) { 909 struct llentry *ln = NULL; 910 911 ln = nd6_lookup(&dr->rtaddr, LLE_SF(AF_INET6, 0), dr->ifp); 912 if (ln == NULL) 913 return (false); 914 bool reachable = ND6_IS_LLINFO_PROBREACH(ln); 915 LLE_RUNLOCK(ln); 916 return reachable; 917} 918 919/* 920 * Default Router Selection according to Section 6.3.6 of RFC 2461 and 921 * draft-ietf-ipngwg-router-selection: 922 * 1) Routers that are reachable or probably reachable should be preferred. 923 * If we have more than one (probably) reachable router, prefer ones 924 * with the highest router preference. 925 * 2) When no routers on the list are known to be reachable or 926 * probably reachable, routers SHOULD be selected in a round-robin 927 * fashion, regardless of router preference values. 928 * 3) If the Default Router List is empty, assume that all 929 * destinations are on-link. 930 * 931 * We assume nd_defrouter is sorted by router preference value. 932 * Since the code below covers both with and without router preference cases, 933 * we do not need to classify the cases by ifdef. 934 * 935 * At this moment, we do not try to install more than one default router, 936 * even when the multipath routing is available, because we're not sure about 937 * the benefits for stub hosts comparing to the risk of making the code 938 * complicated and the possibility of introducing bugs. 939 * 940 * We maintain a single list of routers for multiple FIBs, only considering one 941 * at a time based on the receiving interface's FIB. If @fibnum is RT_ALL_FIBS, 942 * we do the whole thing multiple times. 943 */ 944void 945defrouter_select_fib(int fibnum) 946{ 947 struct epoch_tracker et; 948 struct nd_defrouter *dr, *selected_dr, *installed_dr; 949 950 if (fibnum == RT_ALL_FIBS) { 951 for (fibnum = 0; fibnum < rt_numfibs; fibnum++) { 952 defrouter_select_fib(fibnum); 953 } 954 return; 955 } 956 957 ND6_RLOCK(); 958 /* 959 * Let's handle easy case (3) first: 960 * If default router list is empty, there's nothing to be done. 961 */ 962 if (TAILQ_EMPTY(&V_nd6_defrouter)) { 963 ND6_RUNLOCK(); 964 return; 965 } 966 967 /* 968 * Search for a (probably) reachable router from the list. 969 * We just pick up the first reachable one (if any), assuming that 970 * the ordering rule of the list described in defrtrlist_update(). 971 */ 972 selected_dr = installed_dr = NULL; 973 NET_EPOCH_ENTER(et); 974 TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry) { 975 if (dr->ifp->if_fib != fibnum) 976 continue; 977 978 if (selected_dr == NULL && is_dr_reachable(dr)) { 979 selected_dr = dr; 980 defrouter_ref(selected_dr); 981 } 982 983 if (dr->installed) { 984 if (installed_dr == NULL) { 985 installed_dr = dr; 986 defrouter_ref(installed_dr); 987 } else { 988 /* 989 * this should not happen. 990 * warn for diagnosis. 991 */ 992 log(LOG_ERR, "defrouter_select_fib: more than " 993 "one router is installed\n"); 994 } 995 } 996 } 997 998 /* 999 * If none of the default routers was found to be reachable, 1000 * round-robin the list regardless of preference. 1001 * Otherwise, if we have an installed router, check if the selected 1002 * (reachable) router should really be preferred to the installed one. 1003 * We only prefer the new router when the old one is not reachable 1004 * or when the new one has a really higher preference value. 1005 */ 1006 if (selected_dr == NULL) { 1007 if (installed_dr == NULL || 1008 TAILQ_NEXT(installed_dr, dr_entry) == NULL) 1009 dr = TAILQ_FIRST(&V_nd6_defrouter); 1010 else 1011 dr = TAILQ_NEXT(installed_dr, dr_entry); 1012 1013 /* Ensure we select a router for this FIB. */ 1014 TAILQ_FOREACH_FROM(dr, &V_nd6_defrouter, dr_entry) { 1015 if (dr->ifp->if_fib == fibnum) { 1016 selected_dr = dr; 1017 defrouter_ref(selected_dr); 1018 break; 1019 } 1020 } 1021 } else if (installed_dr != NULL) { 1022 if (is_dr_reachable(installed_dr) && 1023 rtpref(selected_dr) <= rtpref(installed_dr)) { 1024 defrouter_rele(selected_dr); 1025 selected_dr = installed_dr; 1026 } 1027 } 1028 ND6_RUNLOCK(); 1029 1030 /* 1031 * If we selected a router for this FIB and it's different 1032 * than the installed one, remove the installed router and 1033 * install the selected one in its place. 1034 */ 1035 if (installed_dr != selected_dr) { 1036 if (installed_dr != NULL) { 1037 defrouter_delreq(installed_dr); 1038 defrouter_rele(installed_dr); 1039 } 1040 if (selected_dr != NULL) 1041 defrouter_addreq(selected_dr); 1042 } 1043 if (selected_dr != NULL) 1044 defrouter_rele(selected_dr); 1045 NET_EPOCH_EXIT(et); 1046} 1047 1048static struct nd_defrouter * 1049defrtrlist_update(struct nd_defrouter *new) 1050{ 1051 struct nd_defrouter *dr, *n; 1052 uint64_t genid; 1053 int oldpref; 1054 bool writelocked; 1055 1056 if (new->rtlifetime == 0) { 1057 defrouter_remove(&new->rtaddr, new->ifp); 1058 return (NULL); 1059 } 1060 1061 ND6_RLOCK(); 1062 writelocked = false; 1063restart: 1064 dr = defrouter_lookup_locked(&new->rtaddr, new->ifp); 1065 if (dr != NULL) { 1066 oldpref = rtpref(dr); 1067 1068 /* override */ 1069 dr->raflags = new->raflags; /* XXX flag check */ 1070 dr->rtlifetime = new->rtlifetime; 1071 dr->expire = new->expire; 1072 1073 /* 1074 * If the preference does not change, there's no need 1075 * to sort the entries. Also make sure the selected 1076 * router is still installed in the kernel. 1077 */ 1078 if (dr->installed && rtpref(new) == oldpref) { 1079 if (writelocked) 1080 ND6_WUNLOCK(); 1081 else 1082 ND6_RUNLOCK(); 1083 return (dr); 1084 } 1085 } 1086 1087 /* 1088 * The router needs to be reinserted into the default router 1089 * list, so upgrade to a write lock. If that fails and the list 1090 * has potentially changed while the lock was dropped, we'll 1091 * redo the lookup with the write lock held. 1092 */ 1093 if (!writelocked) { 1094 writelocked = true; 1095 if (!ND6_TRY_UPGRADE()) { 1096 genid = V_nd6_list_genid; 1097 ND6_RUNLOCK(); 1098 ND6_WLOCK(); 1099 if (genid != V_nd6_list_genid) 1100 goto restart; 1101 } 1102 } 1103 1104 if (dr != NULL) { 1105 /* 1106 * The preferred router may have changed, so relocate this 1107 * router. 1108 */ 1109 TAILQ_REMOVE(&V_nd6_defrouter, dr, dr_entry); 1110 n = dr; 1111 } else { 1112 n = malloc(sizeof(*n), M_IP6NDP, M_NOWAIT | M_ZERO); 1113 if (n == NULL) { 1114 ND6_WUNLOCK(); 1115 return (NULL); 1116 } 1117 memcpy(n, new, sizeof(*n)); 1118 /* Initialize with an extra reference for the caller. */ 1119 refcount_init(&n->refcnt, 2); 1120 } 1121 1122 /* 1123 * Insert the new router in the Default Router List; 1124 * The Default Router List should be in the descending order 1125 * of router-preferece. Routers with the same preference are 1126 * sorted in the arriving time order. 1127 */ 1128 1129 /* insert at the end of the group */ 1130 TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry) { 1131 if (rtpref(n) > rtpref(dr)) 1132 break; 1133 } 1134 if (dr != NULL) 1135 TAILQ_INSERT_BEFORE(dr, n, dr_entry); 1136 else 1137 TAILQ_INSERT_TAIL(&V_nd6_defrouter, n, dr_entry); 1138 V_nd6_list_genid++; 1139 ND6_WUNLOCK(); 1140 1141 defrouter_select_fib(new->ifp->if_fib); 1142 1143 return (n); 1144} 1145 1146static int 1147in6_init_prefix_ltimes(struct nd_prefix *ndpr) 1148{ 1149 if (ndpr->ndpr_pltime == ND6_INFINITE_LIFETIME) 1150 ndpr->ndpr_preferred = 0; 1151 else 1152 ndpr->ndpr_preferred = time_uptime + ndpr->ndpr_pltime; 1153 if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME) 1154 ndpr->ndpr_expire = 0; 1155 else 1156 ndpr->ndpr_expire = time_uptime + ndpr->ndpr_vltime; 1157 1158 return 0; 1159} 1160 1161static void 1162in6_init_address_ltimes(struct nd_prefix *new, struct in6_addrlifetime *lt6) 1163{ 1164 /* init ia6t_expire */ 1165 if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME) 1166 lt6->ia6t_expire = 0; 1167 else { 1168 lt6->ia6t_expire = time_uptime; 1169 lt6->ia6t_expire += lt6->ia6t_vltime; 1170 } 1171 1172 /* init ia6t_preferred */ 1173 if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME) 1174 lt6->ia6t_preferred = 0; 1175 else { 1176 lt6->ia6t_preferred = time_uptime; 1177 lt6->ia6t_preferred += lt6->ia6t_pltime; 1178 } 1179} 1180 1181static struct in6_ifaddr * 1182in6_ifadd(struct nd_prefixctl *pr, int mcast) 1183{ 1184 struct ifnet *ifp = pr->ndpr_ifp; 1185 struct ifaddr *ifa; 1186 struct in6_aliasreq ifra; 1187 struct in6_ifaddr *ia, *ib; 1188 int error, plen0; 1189 struct in6_addr mask; 1190 int prefixlen = pr->ndpr_plen; 1191 int updateflags; 1192 char ip6buf[INET6_ADDRSTRLEN]; 1193 1194 in6_prefixlen2mask(&mask, prefixlen); 1195 1196 /* 1197 * find a link-local address (will be interface ID). 1198 * Is it really mandatory? Theoretically, a global or a site-local 1199 * address can be configured without a link-local address, if we 1200 * have a unique interface identifier... 1201 * 1202 * it is not mandatory to have a link-local address, we can generate 1203 * interface identifier on the fly. we do this because: 1204 * (1) it should be the easiest way to find interface identifier. 1205 * (2) RFC2462 5.4 suggesting the use of the same interface identifier 1206 * for multiple addresses on a single interface, and possible shortcut 1207 * of DAD. we omitted DAD for this reason in the past. 1208 * (3) a user can prevent autoconfiguration of global address 1209 * by removing link-local address by hand (this is partly because we 1210 * don't have other way to control the use of IPv6 on an interface. 1211 * this has been our design choice - cf. NRL's "ifconfig auto"). 1212 * (4) it is easier to manage when an interface has addresses 1213 * with the same interface identifier, than to have multiple addresses 1214 * with different interface identifiers. 1215 */ 1216 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0); /* 0 is OK? */ 1217 if (ifa) 1218 ib = (struct in6_ifaddr *)ifa; 1219 else 1220 return NULL; 1221 1222 /* prefixlen + ifidlen must be equal to 128 */ 1223 plen0 = in6_mask2len(&ib->ia_prefixmask.sin6_addr, NULL); 1224 if (prefixlen != plen0) { 1225 ifa_free(ifa); 1226 nd6log((LOG_INFO, 1227 "%s: wrong prefixlen for %s (prefix=%d ifid=%d)\n", 1228 __func__, if_name(ifp), prefixlen, 128 - plen0)); 1229 return NULL; 1230 } 1231 1232 /* make ifaddr */ 1233 in6_prepare_ifra(&ifra, &pr->ndpr_prefix.sin6_addr, &mask); 1234 1235 IN6_MASK_ADDR(&ifra.ifra_addr.sin6_addr, &mask); 1236 /* interface ID */ 1237 ifra.ifra_addr.sin6_addr.s6_addr32[0] |= 1238 (ib->ia_addr.sin6_addr.s6_addr32[0] & ~mask.s6_addr32[0]); 1239 ifra.ifra_addr.sin6_addr.s6_addr32[1] |= 1240 (ib->ia_addr.sin6_addr.s6_addr32[1] & ~mask.s6_addr32[1]); 1241 ifra.ifra_addr.sin6_addr.s6_addr32[2] |= 1242 (ib->ia_addr.sin6_addr.s6_addr32[2] & ~mask.s6_addr32[2]); 1243 ifra.ifra_addr.sin6_addr.s6_addr32[3] |= 1244 (ib->ia_addr.sin6_addr.s6_addr32[3] & ~mask.s6_addr32[3]); 1245 ifa_free(ifa); 1246 1247 /* lifetimes. */ 1248 ifra.ifra_lifetime.ia6t_vltime = pr->ndpr_vltime; 1249 ifra.ifra_lifetime.ia6t_pltime = pr->ndpr_pltime; 1250 1251 /* XXX: scope zone ID? */ 1252 1253 ifra.ifra_flags |= IN6_IFF_AUTOCONF; /* obey autoconf */ 1254 1255 /* 1256 * Make sure that we do not have this address already. This should 1257 * usually not happen, but we can still see this case, e.g., if we 1258 * have manually configured the exact address to be configured. 1259 */ 1260 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, 1261 &ifra.ifra_addr.sin6_addr); 1262 if (ifa != NULL) { 1263 ifa_free(ifa); 1264 /* this should be rare enough to make an explicit log */ 1265 log(LOG_INFO, "in6_ifadd: %s is already configured\n", 1266 ip6_sprintf(ip6buf, &ifra.ifra_addr.sin6_addr)); 1267 return (NULL); 1268 } 1269 1270 /* 1271 * Allocate ifaddr structure, link into chain, etc. 1272 * If we are going to create a new address upon receiving a multicasted 1273 * RA, we need to impose a random delay before starting DAD. 1274 * [draft-ietf-ipv6-rfc2462bis-02.txt, Section 5.4.2] 1275 */ 1276 updateflags = 0; 1277 if (mcast) 1278 updateflags |= IN6_IFAUPDATE_DADDELAY; 1279 if ((error = in6_update_ifa(ifp, &ifra, NULL, updateflags)) != 0) { 1280 nd6log((LOG_ERR, 1281 "%s: failed to make ifaddr %s on %s (errno=%d)\n", __func__, 1282 ip6_sprintf(ip6buf, &ifra.ifra_addr.sin6_addr), 1283 if_name(ifp), error)); 1284 return (NULL); /* ifaddr must not have been allocated. */ 1285 } 1286 1287 ia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr); 1288 /* 1289 * XXXRW: Assumption of non-NULLness here might not be true with 1290 * fine-grained locking -- should we validate it? Or just return 1291 * earlier ifa rather than looking it up again? 1292 */ 1293 return (ia); /* this is always non-NULL and referenced. */ 1294} 1295 1296static struct nd_prefix * 1297nd6_prefix_lookup_locked(struct nd_prefixctl *key) 1298{ 1299 struct nd_prefix *search; 1300 1301 ND6_LOCK_ASSERT(); 1302 1303 LIST_FOREACH(search, &V_nd_prefix, ndpr_entry) { 1304 if (key->ndpr_ifp == search->ndpr_ifp && 1305 key->ndpr_plen == search->ndpr_plen && 1306 in6_are_prefix_equal(&key->ndpr_prefix.sin6_addr, 1307 &search->ndpr_prefix.sin6_addr, key->ndpr_plen)) { 1308 nd6_prefix_ref(search); 1309 break; 1310 } 1311 } 1312 return (search); 1313} 1314 1315struct nd_prefix * 1316nd6_prefix_lookup(struct nd_prefixctl *key) 1317{ 1318 struct nd_prefix *search; 1319 1320 ND6_RLOCK(); 1321 search = nd6_prefix_lookup_locked(key); 1322 ND6_RUNLOCK(); 1323 return (search); 1324} 1325 1326void 1327nd6_prefix_ref(struct nd_prefix *pr) 1328{ 1329 1330 refcount_acquire(&pr->ndpr_refcnt); 1331} 1332 1333void 1334nd6_prefix_rele(struct nd_prefix *pr) 1335{ 1336 1337 if (refcount_release(&pr->ndpr_refcnt)) { 1338 KASSERT(LIST_EMPTY(&pr->ndpr_advrtrs), 1339 ("prefix %p has advertising routers", pr)); 1340 free(pr, M_IP6NDP); 1341 } 1342} 1343 1344int 1345nd6_prelist_add(struct nd_prefixctl *pr, struct nd_defrouter *dr, 1346 struct nd_prefix **newp) 1347{ 1348 struct nd_prefix *new; 1349 char ip6buf[INET6_ADDRSTRLEN]; 1350 int error; 1351 1352 new = malloc(sizeof(*new), M_IP6NDP, M_NOWAIT | M_ZERO); 1353 if (new == NULL) 1354 return (ENOMEM); 1355 refcount_init(&new->ndpr_refcnt, newp != NULL ? 2 : 1); 1356 new->ndpr_ifp = pr->ndpr_ifp; 1357 new->ndpr_prefix = pr->ndpr_prefix; 1358 new->ndpr_plen = pr->ndpr_plen; 1359 new->ndpr_vltime = pr->ndpr_vltime; 1360 new->ndpr_pltime = pr->ndpr_pltime; 1361 new->ndpr_flags = pr->ndpr_flags; 1362 if ((error = in6_init_prefix_ltimes(new)) != 0) { 1363 free(new, M_IP6NDP); 1364 return (error); 1365 } 1366 new->ndpr_lastupdate = time_uptime; 1367 1368 /* initialization */ 1369 LIST_INIT(&new->ndpr_advrtrs); 1370 in6_prefixlen2mask(&new->ndpr_mask, new->ndpr_plen); 1371 /* make prefix in the canonical form */ 1372 IN6_MASK_ADDR(&new->ndpr_prefix.sin6_addr, &new->ndpr_mask); 1373 1374 ND6_WLOCK(); 1375 LIST_INSERT_HEAD(&V_nd_prefix, new, ndpr_entry); 1376 V_nd6_list_genid++; 1377 ND6_WUNLOCK(); 1378 1379 /* ND_OPT_PI_FLAG_ONLINK processing */ 1380 if (new->ndpr_raf_onlink) { 1381 struct epoch_tracker et; 1382 1383 ND6_ONLINK_LOCK(); 1384 NET_EPOCH_ENTER(et); 1385 if ((error = nd6_prefix_onlink(new)) != 0) { 1386 nd6log((LOG_ERR, "%s: failed to make the prefix %s/%d " 1387 "on-link on %s (errno=%d)\n", __func__, 1388 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr), 1389 pr->ndpr_plen, if_name(pr->ndpr_ifp), error)); 1390 /* proceed anyway. XXX: is it correct? */ 1391 } 1392 NET_EPOCH_EXIT(et); 1393 ND6_ONLINK_UNLOCK(); 1394 } 1395 1396 if (dr != NULL) 1397 pfxrtr_add(new, dr); 1398 if (newp != NULL) 1399 *newp = new; 1400 return (0); 1401} 1402 1403/* 1404 * Remove a prefix from the prefix list and optionally stash it in a 1405 * caller-provided list. 1406 * 1407 * The ND6 lock must be held. 1408 */ 1409void 1410nd6_prefix_unlink(struct nd_prefix *pr, struct nd_prhead *list) 1411{ 1412 1413 ND6_WLOCK_ASSERT(); 1414 1415 LIST_REMOVE(pr, ndpr_entry); 1416 V_nd6_list_genid++; 1417 if (list != NULL) 1418 LIST_INSERT_HEAD(list, pr, ndpr_entry); 1419} 1420 1421/* 1422 * Free an unlinked prefix, first marking it off-link if necessary. 1423 */ 1424void 1425nd6_prefix_del(struct nd_prefix *pr) 1426{ 1427 struct nd_pfxrouter *pfr, *next; 1428 int e; 1429 char ip6buf[INET6_ADDRSTRLEN]; 1430 1431 KASSERT(pr->ndpr_addrcnt == 0, 1432 ("prefix %p has referencing addresses", pr)); 1433 ND6_UNLOCK_ASSERT(); 1434 1435 /* 1436 * Though these flags are now meaningless, we'd rather keep the value 1437 * of pr->ndpr_raf_onlink and pr->ndpr_raf_auto not to confuse users 1438 * when executing "ndp -p". 1439 */ 1440 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0) { 1441 ND6_ONLINK_LOCK(); 1442 if ((e = nd6_prefix_offlink(pr)) != 0) { 1443 nd6log((LOG_ERR, 1444 "%s: failed to make the prefix %s/%d offlink on %s " 1445 "(errno=%d)\n", __func__, 1446 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr), 1447 pr->ndpr_plen, if_name(pr->ndpr_ifp), e)); 1448 /* what should we do? */ 1449 } 1450 ND6_ONLINK_UNLOCK(); 1451 } 1452 1453 /* Release references to routers that have advertised this prefix. */ 1454 ND6_WLOCK(); 1455 LIST_FOREACH_SAFE(pfr, &pr->ndpr_advrtrs, pfr_entry, next) 1456 pfxrtr_del(pfr); 1457 ND6_WUNLOCK(); 1458 1459 nd6_prefix_rele(pr); 1460 1461 pfxlist_onlink_check(); 1462} 1463 1464static int 1465prelist_update(struct nd_prefixctl *new, struct nd_defrouter *dr, 1466 struct mbuf *m, int mcast) 1467{ 1468 struct in6_ifaddr *ia6 = NULL, *ia6_match = NULL; 1469 struct ifaddr *ifa; 1470 struct ifnet *ifp = new->ndpr_ifp; 1471 struct nd_prefix *pr; 1472 int error = 0; 1473 int auth; 1474 struct in6_addrlifetime lt6_tmp; 1475 char ip6buf[INET6_ADDRSTRLEN]; 1476 1477 NET_EPOCH_ASSERT(); 1478 1479 auth = 0; 1480 if (m) { 1481 /* 1482 * Authenticity for NA consists authentication for 1483 * both IP header and IP datagrams, doesn't it ? 1484 */ 1485#if defined(M_AUTHIPHDR) && defined(M_AUTHIPDGM) 1486 auth = ((m->m_flags & M_AUTHIPHDR) && 1487 (m->m_flags & M_AUTHIPDGM)); 1488#endif 1489 } 1490 1491 if ((pr = nd6_prefix_lookup(new)) != NULL) { 1492 /* 1493 * nd6_prefix_lookup() ensures that pr and new have the same 1494 * prefix on a same interface. 1495 */ 1496 1497 /* 1498 * Update prefix information. Note that the on-link (L) bit 1499 * and the autonomous (A) bit should NOT be changed from 1 1500 * to 0. 1501 */ 1502 if (new->ndpr_raf_onlink == 1) 1503 pr->ndpr_raf_onlink = 1; 1504 if (new->ndpr_raf_auto == 1) 1505 pr->ndpr_raf_auto = 1; 1506 if (new->ndpr_raf_onlink) { 1507 pr->ndpr_vltime = new->ndpr_vltime; 1508 pr->ndpr_pltime = new->ndpr_pltime; 1509 (void)in6_init_prefix_ltimes(pr); /* XXX error case? */ 1510 pr->ndpr_lastupdate = time_uptime; 1511 } 1512 1513 if (new->ndpr_raf_onlink && 1514 (pr->ndpr_stateflags & NDPRF_ONLINK) == 0) { 1515 ND6_ONLINK_LOCK(); 1516 if ((error = nd6_prefix_onlink(pr)) != 0) { 1517 nd6log((LOG_ERR, 1518 "%s: failed to make the prefix %s/%d " 1519 "on-link on %s (errno=%d)\n", __func__, 1520 ip6_sprintf(ip6buf, 1521 &pr->ndpr_prefix.sin6_addr), 1522 pr->ndpr_plen, if_name(pr->ndpr_ifp), 1523 error)); 1524 /* proceed anyway. XXX: is it correct? */ 1525 } 1526 ND6_ONLINK_UNLOCK(); 1527 } 1528 1529 if (dr != NULL) 1530 pfxrtr_add(pr, dr); 1531 } else { 1532 if (new->ndpr_vltime == 0) 1533 goto end; 1534 if (new->ndpr_raf_onlink == 0 && new->ndpr_raf_auto == 0) 1535 goto end; 1536 1537 error = nd6_prelist_add(new, dr, &pr); 1538 if (error != 0) { 1539 nd6log((LOG_NOTICE, "%s: nd6_prelist_add() failed for " 1540 "the prefix %s/%d on %s (errno=%d)\n", __func__, 1541 ip6_sprintf(ip6buf, &new->ndpr_prefix.sin6_addr), 1542 new->ndpr_plen, if_name(new->ndpr_ifp), error)); 1543 goto end; /* we should just give up in this case. */ 1544 } 1545 1546 /* 1547 * XXX: from the ND point of view, we can ignore a prefix 1548 * with the on-link bit being zero. However, we need a 1549 * prefix structure for references from autoconfigured 1550 * addresses. Thus, we explicitly make sure that the prefix 1551 * itself expires now. 1552 */ 1553 if (pr->ndpr_raf_onlink == 0) { 1554 pr->ndpr_vltime = 0; 1555 pr->ndpr_pltime = 0; 1556 in6_init_prefix_ltimes(pr); 1557 } 1558 } 1559 1560 /* 1561 * Address autoconfiguration based on Section 5.5.3 of RFC 2462. 1562 * Note that pr must be non NULL at this point. 1563 */ 1564 1565 /* 5.5.3 (a). Ignore the prefix without the A bit set. */ 1566 if (!new->ndpr_raf_auto) 1567 goto end; 1568 1569 /* 1570 * 5.5.3 (b). the link-local prefix should have been ignored in 1571 * nd6_ra_input. 1572 */ 1573 1574 /* 5.5.3 (c). Consistency check on lifetimes: pltime <= vltime. */ 1575 if (new->ndpr_pltime > new->ndpr_vltime) { 1576 error = EINVAL; /* XXX: won't be used */ 1577 goto end; 1578 } 1579 1580 /* 1581 * 5.5.3 (d). If the prefix advertised is not equal to the prefix of 1582 * an address configured by stateless autoconfiguration already in the 1583 * list of addresses associated with the interface, and the Valid 1584 * Lifetime is not 0, form an address. We first check if we have 1585 * a matching prefix. 1586 * Note: we apply a clarification in rfc2462bis-02 here. We only 1587 * consider autoconfigured addresses while RFC2462 simply said 1588 * "address". 1589 */ 1590 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1591 struct in6_ifaddr *ifa6; 1592 u_int32_t remaininglifetime; 1593 1594 if (ifa->ifa_addr->sa_family != AF_INET6) 1595 continue; 1596 1597 ifa6 = (struct in6_ifaddr *)ifa; 1598 1599 /* 1600 * We only consider autoconfigured addresses as per rfc2462bis. 1601 */ 1602 if (!(ifa6->ia6_flags & IN6_IFF_AUTOCONF)) 1603 continue; 1604 1605 /* 1606 * Spec is not clear here, but I believe we should concentrate 1607 * on unicast (i.e. not anycast) addresses. 1608 * XXX: other ia6_flags? detached or duplicated? 1609 */ 1610 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0) 1611 continue; 1612 1613 /* 1614 * Ignore the address if it is not associated with a prefix 1615 * or is associated with a prefix that is different from this 1616 * one. (pr is never NULL here) 1617 */ 1618 if (ifa6->ia6_ndpr != pr) 1619 continue; 1620 1621 if (ia6_match == NULL) /* remember the first one */ 1622 ia6_match = ifa6; 1623 1624 /* 1625 * An already autoconfigured address matched. Now that we 1626 * are sure there is at least one matched address, we can 1627 * proceed to 5.5.3. (e): update the lifetimes according to the 1628 * "two hours" rule and the privacy extension. 1629 * We apply some clarifications in rfc2462bis: 1630 * - use remaininglifetime instead of storedlifetime as a 1631 * variable name 1632 * - remove the dead code in the "two-hour" rule 1633 */ 1634#define TWOHOUR (120*60) 1635 lt6_tmp = ifa6->ia6_lifetime; 1636 1637 if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME) 1638 remaininglifetime = ND6_INFINITE_LIFETIME; 1639 else if (time_uptime - ifa6->ia6_updatetime > 1640 lt6_tmp.ia6t_vltime) { 1641 /* 1642 * The case of "invalid" address. We should usually 1643 * not see this case. 1644 */ 1645 remaininglifetime = 0; 1646 } else 1647 remaininglifetime = lt6_tmp.ia6t_vltime - 1648 (time_uptime - ifa6->ia6_updatetime); 1649 1650 /* when not updating, keep the current stored lifetime. */ 1651 lt6_tmp.ia6t_vltime = remaininglifetime; 1652 1653 if (TWOHOUR < new->ndpr_vltime || 1654 remaininglifetime < new->ndpr_vltime) { 1655 lt6_tmp.ia6t_vltime = new->ndpr_vltime; 1656 } else if (remaininglifetime <= TWOHOUR) { 1657 if (auth) { 1658 lt6_tmp.ia6t_vltime = new->ndpr_vltime; 1659 } 1660 } else { 1661 /* 1662 * new->ndpr_vltime <= TWOHOUR && 1663 * TWOHOUR < remaininglifetime 1664 */ 1665 lt6_tmp.ia6t_vltime = TWOHOUR; 1666 } 1667 1668 /* The 2 hour rule is not imposed for preferred lifetime. */ 1669 lt6_tmp.ia6t_pltime = new->ndpr_pltime; 1670 1671 in6_init_address_ltimes(pr, <6_tmp); 1672 1673 /* 1674 * We need to treat lifetimes for temporary addresses 1675 * differently, according to 1676 * draft-ietf-ipv6-privacy-addrs-v2-01.txt 3.3 (1); 1677 * we only update the lifetimes when they are in the maximum 1678 * intervals. 1679 */ 1680 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0) { 1681 u_int32_t maxvltime, maxpltime; 1682 1683 if (V_ip6_temp_valid_lifetime > 1684 (u_int32_t)((time_uptime - ifa6->ia6_createtime) + 1685 V_ip6_desync_factor)) { 1686 maxvltime = V_ip6_temp_valid_lifetime - 1687 (time_uptime - ifa6->ia6_createtime) - 1688 V_ip6_desync_factor; 1689 } else 1690 maxvltime = 0; 1691 if (V_ip6_temp_preferred_lifetime > 1692 (u_int32_t)((time_uptime - ifa6->ia6_createtime) + 1693 V_ip6_desync_factor)) { 1694 maxpltime = V_ip6_temp_preferred_lifetime - 1695 (time_uptime - ifa6->ia6_createtime) - 1696 V_ip6_desync_factor; 1697 } else 1698 maxpltime = 0; 1699 1700 if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME || 1701 lt6_tmp.ia6t_vltime > maxvltime) { 1702 lt6_tmp.ia6t_vltime = maxvltime; 1703 } 1704 if (lt6_tmp.ia6t_pltime == ND6_INFINITE_LIFETIME || 1705 lt6_tmp.ia6t_pltime > maxpltime) { 1706 lt6_tmp.ia6t_pltime = maxpltime; 1707 } 1708 } 1709 ifa6->ia6_lifetime = lt6_tmp; 1710 ifa6->ia6_updatetime = time_uptime; 1711 } 1712 if (ia6_match == NULL && new->ndpr_vltime) { 1713 int ifidlen; 1714 1715 /* 1716 * 5.5.3 (d) (continued) 1717 * No address matched and the valid lifetime is non-zero. 1718 * Create a new address. 1719 */ 1720 1721 /* 1722 * Prefix Length check: 1723 * If the sum of the prefix length and interface identifier 1724 * length does not equal 128 bits, the Prefix Information 1725 * option MUST be ignored. The length of the interface 1726 * identifier is defined in a separate link-type specific 1727 * document. 1728 */ 1729 ifidlen = in6_if2idlen(ifp); 1730 if (ifidlen < 0) { 1731 /* this should not happen, so we always log it. */ 1732 log(LOG_ERR, "prelist_update: IFID undefined (%s)\n", 1733 if_name(ifp)); 1734 goto end; 1735 } 1736 if (ifidlen + pr->ndpr_plen != 128) { 1737 nd6log((LOG_INFO, 1738 "%s: invalid prefixlen %d for %s, ignored\n", 1739 __func__, pr->ndpr_plen, if_name(ifp))); 1740 goto end; 1741 } 1742 1743 if ((ia6 = in6_ifadd(new, mcast)) != NULL) { 1744 /* 1745 * note that we should use pr (not new) for reference. 1746 */ 1747 pr->ndpr_addrcnt++; 1748 ia6->ia6_ndpr = pr; 1749 1750 /* 1751 * RFC 3041 3.3 (2). 1752 * When a new public address is created as described 1753 * in RFC2462, also create a new temporary address. 1754 * 1755 * RFC 3041 3.5. 1756 * When an interface connects to a new link, a new 1757 * randomized interface identifier should be generated 1758 * immediately together with a new set of temporary 1759 * addresses. Thus, we specifiy 1 as the 2nd arg of 1760 * in6_tmpifadd(). 1761 */ 1762 if (V_ip6_use_tempaddr) { 1763 int e; 1764 if ((e = in6_tmpifadd(ia6, 1, 1)) != 0) { 1765 nd6log((LOG_NOTICE, "%s: failed to " 1766 "create a temporary address " 1767 "(errno=%d)\n", __func__, e)); 1768 } 1769 } 1770 ifa_free(&ia6->ia_ifa); 1771 1772 /* 1773 * A newly added address might affect the status 1774 * of other addresses, so we check and update it. 1775 * XXX: what if address duplication happens? 1776 */ 1777 pfxlist_onlink_check(); 1778 } else { 1779 /* just set an error. do not bark here. */ 1780 error = EADDRNOTAVAIL; /* XXX: might be unused. */ 1781 } 1782 } 1783 1784end: 1785 if (pr != NULL) 1786 nd6_prefix_rele(pr); 1787 return (error); 1788} 1789 1790/* 1791 * A supplement function used in the on-link detection below; 1792 * detect if a given prefix has a (probably) reachable advertising router. 1793 * XXX: lengthy function name... 1794 */ 1795static struct nd_pfxrouter * 1796find_pfxlist_reachable_router(struct nd_prefix *pr) 1797{ 1798 struct epoch_tracker et; 1799 struct nd_pfxrouter *pfxrtr; 1800 1801 ND6_LOCK_ASSERT(); 1802 1803 NET_EPOCH_ENTER(et); 1804 LIST_FOREACH(pfxrtr, &pr->ndpr_advrtrs, pfr_entry) { 1805 if (is_dr_reachable(pfxrtr->router)) 1806 break; 1807 } 1808 NET_EPOCH_EXIT(et); 1809 return (pfxrtr); 1810} 1811 1812/* 1813 * Check if each prefix in the prefix list has at least one available router 1814 * that advertised the prefix (a router is "available" if its neighbor cache 1815 * entry is reachable or probably reachable). 1816 * If the check fails, the prefix may be off-link, because, for example, 1817 * we have moved from the network but the lifetime of the prefix has not 1818 * expired yet. So we should not use the prefix if there is another prefix 1819 * that has an available router. 1820 * But, if there is no prefix that has an available router, we still regard 1821 * all the prefixes as on-link. This is because we can't tell if all the 1822 * routers are simply dead or if we really moved from the network and there 1823 * is no router around us. 1824 */ 1825void 1826pfxlist_onlink_check(void) 1827{ 1828 struct nd_prefix *pr; 1829 struct in6_ifaddr *ifa; 1830 struct nd_defrouter *dr; 1831 struct nd_pfxrouter *pfxrtr = NULL; 1832 struct rm_priotracker in6_ifa_tracker; 1833 uint64_t genid; 1834 uint32_t flags; 1835 1836 ND6_ONLINK_LOCK(); 1837 ND6_RLOCK(); 1838 1839 /* 1840 * Check if there is a prefix that has a reachable advertising 1841 * router. 1842 */ 1843 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) { 1844 if (pr->ndpr_raf_onlink && find_pfxlist_reachable_router(pr)) 1845 break; 1846 } 1847 1848 /* 1849 * If we have no such prefix, check whether we still have a router 1850 * that does not advertise any prefixes. 1851 */ 1852 if (pr == NULL) { 1853 TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry) { 1854 struct nd_prefix *pr0; 1855 1856 LIST_FOREACH(pr0, &V_nd_prefix, ndpr_entry) { 1857 if ((pfxrtr = pfxrtr_lookup(pr0, dr)) != NULL) 1858 break; 1859 } 1860 if (pfxrtr != NULL) 1861 break; 1862 } 1863 } 1864 if (pr != NULL || (!TAILQ_EMPTY(&V_nd6_defrouter) && pfxrtr == NULL)) { 1865 /* 1866 * There is at least one prefix that has a reachable router, 1867 * or at least a router which probably does not advertise 1868 * any prefixes. The latter would be the case when we move 1869 * to a new link where we have a router that does not provide 1870 * prefixes and we configure an address by hand. 1871 * Detach prefixes which have no reachable advertising 1872 * router, and attach other prefixes. 1873 */ 1874 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) { 1875 /* XXX: a link-local prefix should never be detached */ 1876 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr) || 1877 pr->ndpr_raf_onlink == 0 || 1878 pr->ndpr_raf_auto == 0) 1879 continue; 1880 1881 if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 && 1882 find_pfxlist_reachable_router(pr) == NULL) 1883 pr->ndpr_stateflags |= NDPRF_DETACHED; 1884 else if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 && 1885 find_pfxlist_reachable_router(pr) != NULL) 1886 pr->ndpr_stateflags &= ~NDPRF_DETACHED; 1887 } 1888 } else { 1889 /* there is no prefix that has a reachable router */ 1890 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) { 1891 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr) || 1892 pr->ndpr_raf_onlink == 0 || 1893 pr->ndpr_raf_auto == 0) 1894 continue; 1895 pr->ndpr_stateflags &= ~NDPRF_DETACHED; 1896 } 1897 } 1898 1899 /* 1900 * Remove each interface route associated with a (just) detached 1901 * prefix, and reinstall the interface route for a (just) attached 1902 * prefix. Note that all attempt of reinstallation does not 1903 * necessarily success, when a same prefix is shared among multiple 1904 * interfaces. Such cases will be handled in nd6_prefix_onlink, 1905 * so we don't have to care about them. 1906 */ 1907restart: 1908 LIST_FOREACH(pr, &V_nd_prefix, ndpr_entry) { 1909 char ip6buf[INET6_ADDRSTRLEN]; 1910 int e; 1911 1912 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr) || 1913 pr->ndpr_raf_onlink == 0 || 1914 pr->ndpr_raf_auto == 0) 1915 continue; 1916 1917 flags = pr->ndpr_stateflags & (NDPRF_DETACHED | NDPRF_ONLINK); 1918 if (flags == 0 || flags == (NDPRF_DETACHED | NDPRF_ONLINK)) { 1919 genid = V_nd6_list_genid; 1920 ND6_RUNLOCK(); 1921 if ((flags & NDPRF_ONLINK) != 0 && 1922 (e = nd6_prefix_offlink(pr)) != 0) { 1923 nd6log((LOG_ERR, 1924 "%s: failed to make %s/%d offlink " 1925 "(errno=%d)\n", __func__, 1926 ip6_sprintf(ip6buf, 1927 &pr->ndpr_prefix.sin6_addr), 1928 pr->ndpr_plen, e)); 1929 } else if ((flags & NDPRF_ONLINK) == 0 && 1930 (e = nd6_prefix_onlink(pr)) != 0) { 1931 nd6log((LOG_ERR, 1932 "%s: failed to make %s/%d onlink " 1933 "(errno=%d)\n", __func__, 1934 ip6_sprintf(ip6buf, 1935 &pr->ndpr_prefix.sin6_addr), 1936 pr->ndpr_plen, e)); 1937 } 1938 ND6_RLOCK(); 1939 if (genid != V_nd6_list_genid) 1940 goto restart; 1941 } 1942 } 1943 1944 /* 1945 * Changes on the prefix status might affect address status as well. 1946 * Make sure that all addresses derived from an attached prefix are 1947 * attached, and that all addresses derived from a detached prefix are 1948 * detached. Note, however, that a manually configured address should 1949 * always be attached. 1950 * The precise detection logic is same as the one for prefixes. 1951 */ 1952 IN6_IFADDR_RLOCK(&in6_ifa_tracker); 1953 CK_STAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) { 1954 if (!(ifa->ia6_flags & IN6_IFF_AUTOCONF)) 1955 continue; 1956 1957 if (ifa->ia6_ndpr == NULL) { 1958 /* 1959 * This can happen when we first configure the address 1960 * (i.e. the address exists, but the prefix does not). 1961 * XXX: complicated relationships... 1962 */ 1963 continue; 1964 } 1965 1966 if (find_pfxlist_reachable_router(ifa->ia6_ndpr)) 1967 break; 1968 } 1969 if (ifa) { 1970 CK_STAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) { 1971 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0) 1972 continue; 1973 1974 if (ifa->ia6_ndpr == NULL) /* XXX: see above. */ 1975 continue; 1976 1977 if (find_pfxlist_reachable_router(ifa->ia6_ndpr)) { 1978 if (ifa->ia6_flags & IN6_IFF_DETACHED) { 1979 ifa->ia6_flags &= ~IN6_IFF_DETACHED; 1980 ifa->ia6_flags |= IN6_IFF_TENTATIVE; 1981 nd6_dad_start((struct ifaddr *)ifa, 0); 1982 } 1983 } else { 1984 ifa->ia6_flags |= IN6_IFF_DETACHED; 1985 } 1986 } 1987 } else { 1988 CK_STAILQ_FOREACH(ifa, &V_in6_ifaddrhead, ia_link) { 1989 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0) 1990 continue; 1991 1992 if (ifa->ia6_flags & IN6_IFF_DETACHED) { 1993 ifa->ia6_flags &= ~IN6_IFF_DETACHED; 1994 ifa->ia6_flags |= IN6_IFF_TENTATIVE; 1995 /* Do we need a delay in this case? */ 1996 nd6_dad_start((struct ifaddr *)ifa, 0); 1997 } 1998 } 1999 } 2000 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker); 2001 ND6_RUNLOCK(); 2002 ND6_ONLINK_UNLOCK(); 2003} 2004 2005/* 2006 * Add or remove interface route specified by @dst, @netmask and @ifp. 2007 * ifa can be NULL. 2008 * Returns 0 on success 2009 */ 2010static int 2011nd6_prefix_rtrequest(uint32_t fibnum, int cmd, struct sockaddr_in6 *dst, 2012 struct sockaddr_in6 *netmask, struct ifnet *ifp, struct ifaddr *ifa) 2013{ 2014 struct epoch_tracker et; 2015 int error; 2016 2017 /* Prepare gateway */ 2018 struct sockaddr_dl_short sdl = { 2019 .sdl_family = AF_LINK, 2020 .sdl_len = sizeof(struct sockaddr_dl_short), 2021 .sdl_type = ifp->if_type, 2022 .sdl_index = ifp->if_index, 2023 }; 2024 2025 struct rt_addrinfo info = { 2026 .rti_ifa = ifa, 2027 .rti_ifp = ifp, 2028 .rti_flags = RTF_PINNED | ((netmask != NULL) ? 0 : RTF_HOST), 2029 .rti_info = { 2030 [RTAX_DST] = (struct sockaddr *)dst, 2031 [RTAX_NETMASK] = (struct sockaddr *)netmask, 2032 [RTAX_GATEWAY] = (struct sockaddr *)&sdl, 2033 }, 2034 }; 2035 /* Don't set additional per-gw filters on removal */ 2036 2037 NET_EPOCH_ENTER(et); 2038 error = rib_handle_ifaddr_info(fibnum, cmd, &info); 2039 NET_EPOCH_EXIT(et); 2040 return (error); 2041} 2042 2043static int 2044nd6_prefix_onlink_rtrequest(struct nd_prefix *pr, struct ifaddr *ifa) 2045{ 2046 int error; 2047 2048 struct sockaddr_in6 mask6 = { 2049 .sin6_family = AF_INET6, 2050 .sin6_len = sizeof(struct sockaddr_in6), 2051 .sin6_addr = pr->ndpr_mask, 2052 }; 2053 struct sockaddr_in6 *pmask6 = (pr->ndpr_plen != 128) ? &mask6 : NULL; 2054 2055 error = nd6_prefix_rtrequest(pr->ndpr_ifp->if_fib, RTM_ADD, 2056 &pr->ndpr_prefix, pmask6, pr->ndpr_ifp, ifa); 2057 if (error == 0) 2058 pr->ndpr_stateflags |= NDPRF_ONLINK; 2059 2060 return (error); 2061} 2062 2063static int 2064nd6_prefix_onlink(struct nd_prefix *pr) 2065{ 2066 struct epoch_tracker et; 2067 struct ifaddr *ifa; 2068 struct ifnet *ifp = pr->ndpr_ifp; 2069 struct nd_prefix *opr; 2070 char ip6buf[INET6_ADDRSTRLEN]; 2071 int error; 2072 2073 ND6_ONLINK_LOCK_ASSERT(); 2074 ND6_UNLOCK_ASSERT(); 2075 2076 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0) 2077 return (EEXIST); 2078 2079 /* 2080 * Add the interface route associated with the prefix. Before 2081 * installing the route, check if there's the same prefix on another 2082 * interface, and the prefix has already installed the interface route. 2083 * Although such a configuration is expected to be rare, we explicitly 2084 * allow it. 2085 */ 2086 ND6_RLOCK(); 2087 LIST_FOREACH(opr, &V_nd_prefix, ndpr_entry) { 2088 if (opr == pr) 2089 continue; 2090 2091 if ((opr->ndpr_stateflags & NDPRF_ONLINK) == 0) 2092 continue; 2093 2094 if (!V_rt_add_addr_allfibs && 2095 opr->ndpr_ifp->if_fib != pr->ndpr_ifp->if_fib) 2096 continue; 2097 2098 if (opr->ndpr_plen == pr->ndpr_plen && 2099 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr, 2100 &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen)) { 2101 ND6_RUNLOCK(); 2102 return (0); 2103 } 2104 } 2105 ND6_RUNLOCK(); 2106 2107 /* 2108 * We prefer link-local addresses as the associated interface address. 2109 */ 2110 /* search for a link-local addr */ 2111 NET_EPOCH_ENTER(et); 2112 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 2113 IN6_IFF_NOTREADY | IN6_IFF_ANYCAST); 2114 if (ifa == NULL) { 2115 /* XXX: freebsd does not have ifa_ifwithaf */ 2116 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 2117 if (ifa->ifa_addr->sa_family == AF_INET6) { 2118 ifa_ref(ifa); 2119 break; 2120 } 2121 } 2122 /* should we care about ia6_flags? */ 2123 } 2124 if (ifa == NULL) { 2125 /* 2126 * This can still happen, when, for example, we receive an RA 2127 * containing a prefix with the L bit set and the A bit clear, 2128 * after removing all IPv6 addresses on the receiving 2129 * interface. This should, of course, be rare though. 2130 */ 2131 nd6log((LOG_NOTICE, 2132 "%s: failed to find any ifaddr to add route for a " 2133 "prefix(%s/%d) on %s\n", __func__, 2134 ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr), 2135 pr->ndpr_plen, if_name(ifp))); 2136 error = 0; 2137 } else { 2138 error = nd6_prefix_onlink_rtrequest(pr, ifa); 2139 ifa_free(ifa); 2140 } 2141 NET_EPOCH_EXIT(et); 2142 2143 return (error); 2144} 2145 2146int 2147nd6_prefix_offlink(struct nd_prefix *pr) 2148{ 2149 int error = 0; 2150 struct ifnet *ifp = pr->ndpr_ifp; 2151 struct nd_prefix *opr; 2152 char ip6buf[INET6_ADDRSTRLEN]; 2153 uint64_t genid; 2154 int a_failure; 2155 2156 ND6_ONLINK_LOCK_ASSERT(); 2157 ND6_UNLOCK_ASSERT(); 2158 2159 if ((pr->ndpr_stateflags & NDPRF_ONLINK) == 0) 2160 return (EEXIST); 2161 2162 struct sockaddr_in6 mask6 = { 2163 .sin6_family = AF_INET6, 2164 .sin6_len = sizeof(struct sockaddr_in6), 2165 .sin6_addr = pr->ndpr_mask, 2166 }; 2167 struct sockaddr_in6 *pmask6 = (pr->ndpr_plen != 128) ? &mask6 : NULL; 2168 2169 error = nd6_prefix_rtrequest(ifp->if_fib, RTM_DELETE, 2170 &pr->ndpr_prefix, pmask6, ifp, NULL); 2171 2172 a_failure = 1; 2173 if (error == 0) { 2174 pr->ndpr_stateflags &= ~NDPRF_ONLINK; 2175 2176 /* 2177 * There might be the same prefix on another interface, 2178 * the prefix which could not be on-link just because we have 2179 * the interface route (see comments in nd6_prefix_onlink). 2180 * If there's one, try to make the prefix on-link on the 2181 * interface. 2182 */ 2183 ND6_RLOCK(); 2184restart: 2185 LIST_FOREACH(opr, &V_nd_prefix, ndpr_entry) { 2186 /* 2187 * KAME specific: detached prefixes should not be 2188 * on-link. 2189 */ 2190 if (opr == pr || (opr->ndpr_stateflags & 2191 (NDPRF_ONLINK | NDPRF_DETACHED)) != 0) 2192 continue; 2193 2194 if (opr->ndpr_plen == pr->ndpr_plen && 2195 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr, 2196 &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen)) { 2197 int e; 2198 2199 genid = V_nd6_list_genid; 2200 ND6_RUNLOCK(); 2201 if ((e = nd6_prefix_onlink(opr)) != 0) { 2202 nd6log((LOG_ERR, 2203 "%s: failed to recover a prefix " 2204 "%s/%d from %s to %s (errno=%d)\n", 2205 __func__, ip6_sprintf(ip6buf, 2206 &opr->ndpr_prefix.sin6_addr), 2207 opr->ndpr_plen, if_name(ifp), 2208 if_name(opr->ndpr_ifp), e)); 2209 } else 2210 a_failure = 0; 2211 ND6_RLOCK(); 2212 if (genid != V_nd6_list_genid) 2213 goto restart; 2214 } 2215 } 2216 ND6_RUNLOCK(); 2217 } else { 2218 /* XXX: can we still set the NDPRF_ONLINK flag? */ 2219 nd6log((LOG_ERR, 2220 "%s: failed to delete route: %s/%d on %s (errno=%d)\n", 2221 __func__, ip6_sprintf(ip6buf, &pr->ndpr_prefix.sin6_addr), 2222 pr->ndpr_plen, if_name(ifp), error)); 2223 } 2224 2225 if (a_failure) 2226 lltable_prefix_free(AF_INET6, 2227 (struct sockaddr *)&pr->ndpr_prefix, 2228 (struct sockaddr *)&mask6, LLE_STATIC); 2229 2230 return (error); 2231} 2232 2233/* 2234 * ia0 - corresponding public address 2235 */ 2236int 2237in6_tmpifadd(const struct in6_ifaddr *ia0, int forcegen, int delay) 2238{ 2239 struct ifnet *ifp = ia0->ia_ifa.ifa_ifp; 2240 struct in6_ifaddr *newia; 2241 struct in6_aliasreq ifra; 2242 int error; 2243 int trylimit = 3; /* XXX: adhoc value */ 2244 int updateflags; 2245 u_int32_t randid[2]; 2246 time_t vltime0, pltime0; 2247 2248 in6_prepare_ifra(&ifra, &ia0->ia_addr.sin6_addr, 2249 &ia0->ia_prefixmask.sin6_addr); 2250 2251 ifra.ifra_addr = ia0->ia_addr; /* XXX: do we need this ? */ 2252 /* clear the old IFID */ 2253 IN6_MASK_ADDR(&ifra.ifra_addr.sin6_addr, 2254 &ifra.ifra_prefixmask.sin6_addr); 2255 2256 again: 2257 if (in6_get_tmpifid(ifp, (u_int8_t *)randid, 2258 (const u_int8_t *)&ia0->ia_addr.sin6_addr.s6_addr[8], forcegen)) { 2259 nd6log((LOG_NOTICE, "%s: failed to find a good random IFID\n", 2260 __func__)); 2261 return (EINVAL); 2262 } 2263 ifra.ifra_addr.sin6_addr.s6_addr32[2] |= 2264 (randid[0] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[2])); 2265 ifra.ifra_addr.sin6_addr.s6_addr32[3] |= 2266 (randid[1] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[3])); 2267 2268 /* 2269 * in6_get_tmpifid() quite likely provided a unique interface ID. 2270 * However, we may still have a chance to see collision, because 2271 * there may be a time lag between generation of the ID and generation 2272 * of the address. So, we'll do one more sanity check. 2273 */ 2274 2275 if (in6_localip(&ifra.ifra_addr.sin6_addr) != 0) { 2276 if (trylimit-- > 0) { 2277 forcegen = 1; 2278 goto again; 2279 } 2280 2281 /* Give up. Something strange should have happened. */ 2282 nd6log((LOG_NOTICE, "%s: failed to find a unique random IFID\n", 2283 __func__)); 2284 return (EEXIST); 2285 } 2286 2287 /* 2288 * The Valid Lifetime is the lower of the Valid Lifetime of the 2289 * public address or TEMP_VALID_LIFETIME. 2290 * The Preferred Lifetime is the lower of the Preferred Lifetime 2291 * of the public address or TEMP_PREFERRED_LIFETIME - 2292 * DESYNC_FACTOR. 2293 */ 2294 if (ia0->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) { 2295 vltime0 = IFA6_IS_INVALID(ia0) ? 0 : 2296 (ia0->ia6_lifetime.ia6t_vltime - 2297 (time_uptime - ia0->ia6_updatetime)); 2298 if (vltime0 > V_ip6_temp_valid_lifetime) 2299 vltime0 = V_ip6_temp_valid_lifetime; 2300 } else 2301 vltime0 = V_ip6_temp_valid_lifetime; 2302 if (ia0->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) { 2303 pltime0 = IFA6_IS_DEPRECATED(ia0) ? 0 : 2304 (ia0->ia6_lifetime.ia6t_pltime - 2305 (time_uptime - ia0->ia6_updatetime)); 2306 if (pltime0 > V_ip6_temp_preferred_lifetime - V_ip6_desync_factor){ 2307 pltime0 = V_ip6_temp_preferred_lifetime - 2308 V_ip6_desync_factor; 2309 } 2310 } else 2311 pltime0 = V_ip6_temp_preferred_lifetime - V_ip6_desync_factor; 2312 ifra.ifra_lifetime.ia6t_vltime = vltime0; 2313 ifra.ifra_lifetime.ia6t_pltime = pltime0; 2314 2315 /* 2316 * A temporary address is created only if this calculated Preferred 2317 * Lifetime is greater than REGEN_ADVANCE time units. 2318 */ 2319 if (ifra.ifra_lifetime.ia6t_pltime <= V_ip6_temp_regen_advance) 2320 return (0); 2321 2322 /* XXX: scope zone ID? */ 2323 2324 ifra.ifra_flags |= (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY); 2325 2326 /* allocate ifaddr structure, link into chain, etc. */ 2327 updateflags = 0; 2328 if (delay) 2329 updateflags |= IN6_IFAUPDATE_DADDELAY; 2330 if ((error = in6_update_ifa(ifp, &ifra, NULL, updateflags)) != 0) 2331 return (error); 2332 2333 newia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr); 2334 if (newia == NULL) { /* XXX: can it happen? */ 2335 nd6log((LOG_ERR, 2336 "%s: ifa update succeeded, but we got no ifaddr\n", 2337 __func__)); 2338 return (EINVAL); /* XXX */ 2339 } 2340 newia->ia6_ndpr = ia0->ia6_ndpr; 2341 newia->ia6_ndpr->ndpr_addrcnt++; 2342 ifa_free(&newia->ia_ifa); 2343 2344 /* 2345 * A newly added address might affect the status of other addresses. 2346 * XXX: when the temporary address is generated with a new public 2347 * address, the onlink check is redundant. However, it would be safe 2348 * to do the check explicitly everywhere a new address is generated, 2349 * and, in fact, we surely need the check when we create a new 2350 * temporary address due to deprecation of an old temporary address. 2351 */ 2352 pfxlist_onlink_check(); 2353 2354 return (0); 2355} 2356 2357static int 2358rt6_deleteroute(const struct rtentry *rt, const struct nhop_object *nh, 2359 void *arg) 2360{ 2361 struct in6_addr *gate = (struct in6_addr *)arg; 2362 int nh_rt_flags; 2363 2364 if (nh->gw_sa.sa_family != AF_INET6) 2365 return (0); 2366 2367 if (!IN6_ARE_ADDR_EQUAL(gate, &nh->gw6_sa.sin6_addr)) { 2368 return (0); 2369 } 2370 2371 /* 2372 * Do not delete a static route. 2373 * XXX: this seems to be a bit ad-hoc. Should we consider the 2374 * 'cloned' bit instead? 2375 */ 2376 nh_rt_flags = nhop_get_rtflags(nh); 2377 if ((nh_rt_flags & RTF_STATIC) != 0) 2378 return (0); 2379 2380 /* 2381 * We delete only host route. This means, in particular, we don't 2382 * delete default route. 2383 */ 2384 if ((nh_rt_flags & RTF_HOST) == 0) 2385 return (0); 2386 2387 return (1); 2388#undef SIN6 2389} 2390 2391/* 2392 * Delete all the routing table entries that use the specified gateway. 2393 * XXX: this function causes search through all entries of routing table, so 2394 * it shouldn't be called when acting as a router. 2395 */ 2396void 2397rt6_flush(struct in6_addr *gateway, struct ifnet *ifp) 2398{ 2399 2400 /* We'll care only link-local addresses */ 2401 if (!IN6_IS_ADDR_LINKLOCAL(gateway)) 2402 return; 2403 2404 /* XXX Do we really need to walk any but the default FIB? */ 2405 rib_foreach_table_walk_del(AF_INET6, rt6_deleteroute, (void *)gateway); 2406} 2407 2408int 2409nd6_setdefaultiface(int ifindex) 2410{ 2411 2412 if (V_nd6_defifindex != ifindex) { 2413 V_nd6_defifindex = ifindex; 2414 if (V_nd6_defifindex != 0) { 2415 struct epoch_tracker et; 2416 2417 /* 2418 * XXXGL: this function should use ifnet_byindex_ref! 2419 */ 2420 NET_EPOCH_ENTER(et); 2421 V_nd6_defifp = ifnet_byindex(V_nd6_defifindex); 2422 NET_EPOCH_EXIT(et); 2423 if (V_nd6_defifp == NULL) 2424 return (EINVAL); 2425 } else 2426 V_nd6_defifp = NULL; 2427 2428 /* 2429 * Our current implementation assumes one-to-one mapping between 2430 * interfaces and links, so it would be natural to use the 2431 * default interface as the default link. 2432 */ 2433 scope6_setdefault(V_nd6_defifp); 2434 } 2435 2436 return (0); 2437} 2438 2439bool 2440nd6_defrouter_list_empty(void) 2441{ 2442 2443 return (TAILQ_EMPTY(&V_nd6_defrouter)); 2444} 2445 2446void 2447nd6_defrouter_timer(void) 2448{ 2449 struct nd_defrouter *dr, *ndr; 2450 struct nd6_drhead drq; 2451 2452 TAILQ_INIT(&drq); 2453 2454 ND6_WLOCK(); 2455 TAILQ_FOREACH_SAFE(dr, &V_nd6_defrouter, dr_entry, ndr) 2456 if (dr->expire && dr->expire < time_uptime) 2457 defrouter_unlink(dr, &drq); 2458 ND6_WUNLOCK(); 2459 2460 while ((dr = TAILQ_FIRST(&drq)) != NULL) { 2461 TAILQ_REMOVE(&drq, dr, dr_entry); 2462 defrouter_del(dr); 2463 } 2464} 2465 2466/* 2467 * Nuke default router list entries toward ifp. 2468 * We defer removal of default router list entries that is installed in the 2469 * routing table, in order to keep additional side effects as small as possible. 2470 */ 2471void 2472nd6_defrouter_purge(struct ifnet *ifp) 2473{ 2474 struct nd_defrouter *dr, *ndr; 2475 struct nd6_drhead drq; 2476 2477 TAILQ_INIT(&drq); 2478 2479 ND6_WLOCK(); 2480 TAILQ_FOREACH_SAFE(dr, &V_nd6_defrouter, dr_entry, ndr) { 2481 if (dr->installed) 2482 continue; 2483 if (dr->ifp == ifp) 2484 defrouter_unlink(dr, &drq); 2485 } 2486 TAILQ_FOREACH_SAFE(dr, &V_nd6_defrouter, dr_entry, ndr) { 2487 if (!dr->installed) 2488 continue; 2489 if (dr->ifp == ifp) 2490 defrouter_unlink(dr, &drq); 2491 } 2492 ND6_WUNLOCK(); 2493 2494 /* Delete the unlinked router objects. */ 2495 while ((dr = TAILQ_FIRST(&drq)) != NULL) { 2496 TAILQ_REMOVE(&drq, dr, dr_entry); 2497 defrouter_del(dr); 2498 } 2499} 2500 2501void 2502nd6_defrouter_flush_all(void) 2503{ 2504 struct nd_defrouter *dr; 2505 struct nd6_drhead drq; 2506 2507 TAILQ_INIT(&drq); 2508 2509 ND6_WLOCK(); 2510 while ((dr = TAILQ_FIRST(&V_nd6_defrouter)) != NULL) 2511 defrouter_unlink(dr, &drq); 2512 ND6_WUNLOCK(); 2513 2514 while ((dr = TAILQ_FIRST(&drq)) != NULL) { 2515 TAILQ_REMOVE(&drq, dr, dr_entry); 2516 defrouter_del(dr); 2517 } 2518} 2519 2520void 2521nd6_defrouter_init(void) 2522{ 2523 2524 TAILQ_INIT(&V_nd6_defrouter); 2525} 2526 2527static int 2528nd6_sysctl_drlist(SYSCTL_HANDLER_ARGS) 2529{ 2530 struct in6_defrouter d; 2531 struct nd_defrouter *dr; 2532 int error; 2533 2534 if (req->newptr != NULL) 2535 return (EPERM); 2536 2537 error = sysctl_wire_old_buffer(req, 0); 2538 if (error != 0) 2539 return (error); 2540 2541 bzero(&d, sizeof(d)); 2542 d.rtaddr.sin6_family = AF_INET6; 2543 d.rtaddr.sin6_len = sizeof(d.rtaddr); 2544 2545 ND6_RLOCK(); 2546 TAILQ_FOREACH(dr, &V_nd6_defrouter, dr_entry) { 2547 d.rtaddr.sin6_addr = dr->rtaddr; 2548 error = sa6_recoverscope(&d.rtaddr); 2549 if (error != 0) 2550 break; 2551 d.flags = dr->raflags; 2552 d.rtlifetime = dr->rtlifetime; 2553 d.expire = dr->expire + (time_second - time_uptime); 2554 d.if_index = dr->ifp->if_index; 2555 error = SYSCTL_OUT(req, &d, sizeof(d)); 2556 if (error != 0) 2557 break; 2558 } 2559 ND6_RUNLOCK(); 2560 return (error); 2561} 2562SYSCTL_PROC(_net_inet6_icmp6, ICMPV6CTL_ND6_DRLIST, nd6_drlist, 2563 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE, 2564 NULL, 0, nd6_sysctl_drlist, "S,in6_defrouter", 2565 "NDP default router list"); 2566