1 /* $FreeBSD: src/sys/netinet6/nd6_rtr.c,v 1.2.2.5 2003/04/05 10:28:53 ume Exp $ */ 2 /* $KAME: nd6_rtr.c,v 1.111 2001/04/27 01:37:15 jinmei Exp $ */ 3 4 /* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #include "opt_inet.h" 34 #include "opt_inet6.h" 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/malloc.h> 39 #include <sys/mbuf.h> 40 #include <sys/socket.h> 41 #include <sys/sockio.h> 42 #include <sys/time.h> 43 #include <sys/kernel.h> 44 #include <sys/errno.h> 45 #include <sys/syslog.h> 46 #include <sys/queue.h> 47 #include <sys/globaldata.h> 48 #include <sys/mutex.h> 49 50 #include <sys/thread2.h> 51 #include <sys/mutex2.h> 52 53 #include <net/if.h> 54 #include <net/if_types.h> 55 #include <net/if_dl.h> 56 #include <net/route.h> 57 #include <net/radix.h> 58 59 #include <netinet/in.h> 60 #include <netinet6/in6_var.h> 61 #include <netinet6/in6_ifattach.h> 62 #include <netinet/ip6.h> 63 #include <netinet6/ip6_var.h> 64 #include <netinet6/nd6.h> 65 #include <netinet/icmp6.h> 66 #include <netinet6/scope6_var.h> 67 68 #include <net/net_osdep.h> 69 70 #define SDL(s) ((struct sockaddr_dl *)s) 71 72 static struct nd_defrouter *defrtrlist_update (struct nd_defrouter *); 73 static struct in6_ifaddr *in6_ifadd (struct nd_prefix *, 74 struct in6_addr *); 75 static struct nd_pfxrouter *pfxrtr_lookup (struct nd_prefix *, 76 struct nd_defrouter *); 77 static void pfxrtr_add (struct nd_prefix *, struct nd_defrouter *); 78 static void pfxrtr_del (struct nd_pfxrouter *); 79 static struct nd_pfxrouter *find_pfxlist_reachable_router 80 (struct nd_prefix *); 81 static void defrouter_addifreq (struct ifnet *); 82 83 static void in6_init_address_ltimes (struct nd_prefix *ndpr, 84 struct in6_addrlifetime *lt6); 85 86 static int rt6_deleteroute (struct radix_node *, void *); 87 88 extern int nd6_recalc_reachtm_interval; 89 90 static struct ifnet *nd6_defifp; 91 int nd6_defifindex; 92 93 int ip6_use_tempaddr = 0; 94 95 int ip6_desync_factor; 96 u_int32_t ip6_temp_preferred_lifetime = DEF_TEMP_PREFERRED_LIFETIME; 97 u_int32_t ip6_temp_valid_lifetime = DEF_TEMP_VALID_LIFETIME; 98 /* 99 * shorter lifetimes for debugging purposes. 100 int ip6_temp_preferred_lifetime = 800; 101 static int ip6_temp_valid_lifetime = 1800; 102 */ 103 int ip6_temp_regen_advance = TEMPADDR_REGEN_ADVANCE; 104 105 /* 106 * Receive Router Solicitation Message - just for routers. 107 * Router solicitation/advertisement is mostly managed by userland program 108 * (rtadvd) so here we have no function like nd6_ra_output(). 109 * 110 * Based on RFC 2461 111 */ 112 void 113 nd6_rs_input(struct mbuf *m, int off, int icmp6len) 114 { 115 struct ifnet *ifp = m->m_pkthdr.rcvif; 116 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 117 struct nd_router_solicit *nd_rs; 118 struct in6_addr saddr6 = ip6->ip6_src; 119 #if 0 120 struct in6_addr daddr6 = ip6->ip6_dst; 121 #endif 122 char *lladdr = NULL; 123 int lladdrlen = 0; 124 #if 0 125 struct sockaddr_dl *sdl = NULL; 126 struct llinfo_nd6 *ln = NULL; 127 struct rtentry *rt = NULL; 128 int is_newentry; 129 #endif 130 union nd_opts ndopts; 131 132 /* If I'm not a router, ignore it. */ 133 if (ip6_accept_rtadv != 0 || ip6_forwarding != 1) 134 goto freeit; 135 136 /* Sanity checks */ 137 if (ip6->ip6_hlim != 255) { 138 nd6log((LOG_ERR, 139 "nd6_rs_input: invalid hlim (%d) from %s to %s on %s\n", 140 ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src), 141 ip6_sprintf(&ip6->ip6_dst), if_name(ifp))); 142 goto bad; 143 } 144 145 /* 146 * Don't update the neighbor cache, if src = ::. 147 * This indicates that the src has no IP address assigned yet. 148 */ 149 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) 150 goto freeit; 151 152 #ifndef PULLDOWN_TEST 153 IP6_EXTHDR_CHECK(m, off, icmp6len,); 154 nd_rs = (struct nd_router_solicit *)((caddr_t)ip6 + off); 155 #else 156 IP6_EXTHDR_GET(nd_rs, struct nd_router_solicit *, m, off, icmp6len); 157 if (nd_rs == NULL) { 158 icmp6stat.icp6s_tooshort++; 159 return; 160 } 161 #endif 162 163 icmp6len -= sizeof(*nd_rs); 164 nd6_option_init(nd_rs + 1, icmp6len, &ndopts); 165 if (nd6_options(&ndopts) < 0) { 166 nd6log((LOG_INFO, 167 "nd6_rs_input: invalid ND option, ignored\n")); 168 /* nd6_options have incremented stats */ 169 goto freeit; 170 } 171 172 if (ndopts.nd_opts_src_lladdr) { 173 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1); 174 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3; 175 } 176 177 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 178 nd6log((LOG_INFO, 179 "nd6_rs_input: lladdrlen mismatch for %s " 180 "(if %d, RS packet %d)\n", 181 ip6_sprintf(&saddr6), ifp->if_addrlen, lladdrlen - 2)); 182 goto bad; 183 } 184 185 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_SOLICIT, 0); 186 187 freeit: 188 m_freem(m); 189 return; 190 191 bad: 192 icmp6stat.icp6s_badrs++; 193 m_freem(m); 194 } 195 196 /* 197 * Receive Router Advertisement Message. 198 * 199 * Based on RFC 2461 200 * TODO: on-link bit on prefix information 201 * TODO: ND_RA_FLAG_{OTHER,MANAGED} processing 202 */ 203 void 204 nd6_ra_input(struct mbuf *m, int off, int icmp6len) 205 { 206 struct ifnet *ifp = m->m_pkthdr.rcvif; 207 struct nd_ifinfo *ndi = ND_IFINFO(ifp); 208 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 209 struct nd_router_advert *nd_ra; 210 struct in6_addr saddr6 = ip6->ip6_src; 211 #if 0 212 struct in6_addr daddr6 = ip6->ip6_dst; 213 int flags; /* = nd_ra->nd_ra_flags_reserved; */ 214 int is_managed = ((flags & ND_RA_FLAG_MANAGED) != 0); 215 int is_other = ((flags & ND_RA_FLAG_OTHER) != 0); 216 #endif 217 union nd_opts ndopts; 218 struct nd_defrouter *dr; 219 220 /* 221 * We only accept RAs only when 222 * the system-wide variable allows the acceptance, and 223 * per-interface variable allows RAs on the receiving interface. 224 */ 225 if (ip6_accept_rtadv == 0) 226 goto freeit; 227 if (!(ndi->flags & ND6_IFF_ACCEPT_RTADV)) 228 goto freeit; 229 230 if (ip6->ip6_hlim != 255) { 231 nd6log((LOG_ERR, 232 "nd6_ra_input: invalid hlim (%d) from %s to %s on %s\n", 233 ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src), 234 ip6_sprintf(&ip6->ip6_dst), if_name(ifp))); 235 goto bad; 236 } 237 238 if (!IN6_IS_ADDR_LINKLOCAL(&saddr6)) { 239 nd6log((LOG_ERR, 240 "nd6_ra_input: src %s is not link-local\n", 241 ip6_sprintf(&saddr6))); 242 goto bad; 243 } 244 245 #ifndef PULLDOWN_TEST 246 IP6_EXTHDR_CHECK(m, off, icmp6len,); 247 nd_ra = (struct nd_router_advert *)((caddr_t)ip6 + off); 248 #else 249 IP6_EXTHDR_GET(nd_ra, struct nd_router_advert *, m, off, icmp6len); 250 if (nd_ra == NULL) { 251 icmp6stat.icp6s_tooshort++; 252 return; 253 } 254 #endif 255 256 icmp6len -= sizeof(*nd_ra); 257 nd6_option_init(nd_ra + 1, icmp6len, &ndopts); 258 if (nd6_options(&ndopts) < 0) { 259 nd6log((LOG_INFO, 260 "nd6_ra_input: invalid ND option, ignored\n")); 261 /* nd6_options have incremented stats */ 262 goto freeit; 263 } 264 265 { 266 struct nd_defrouter dr0; 267 u_int32_t advreachable = nd_ra->nd_ra_reachable; 268 269 dr0.rtaddr = saddr6; 270 dr0.flags = nd_ra->nd_ra_flags_reserved; 271 dr0.rtlifetime = ntohs(nd_ra->nd_ra_router_lifetime); 272 dr0.expire = time_uptime + dr0.rtlifetime; 273 dr0.ifp = ifp; 274 dr0.advint = 0; /* Mobile IPv6 */ 275 dr0.advint_expire = 0; /* Mobile IPv6 */ 276 dr0.advints_lost = 0; /* Mobile IPv6 */ 277 /* unspecified or not? (RFC 2461 6.3.4) */ 278 if (advreachable) { 279 advreachable = ntohl(advreachable); 280 if (advreachable <= MAX_REACHABLE_TIME && 281 ndi->basereachable != advreachable) { 282 ndi->basereachable = advreachable; 283 ndi->reachable = ND_COMPUTE_RTIME(ndi->basereachable); 284 ndi->recalctm = nd6_recalc_reachtm_interval; /* reset */ 285 } 286 } 287 if (nd_ra->nd_ra_retransmit) 288 ndi->retrans = ntohl(nd_ra->nd_ra_retransmit); 289 if (nd_ra->nd_ra_curhoplimit) 290 ndi->chlim = nd_ra->nd_ra_curhoplimit; 291 dr = defrtrlist_update(&dr0); 292 } 293 294 /* 295 * prefix 296 */ 297 if (ndopts.nd_opts_pi) { 298 struct nd_opt_hdr *pt; 299 struct nd_opt_prefix_info *pi = NULL; 300 struct nd_prefix pr; 301 302 for (pt = (struct nd_opt_hdr *)ndopts.nd_opts_pi; 303 pt <= (struct nd_opt_hdr *)ndopts.nd_opts_pi_end; 304 pt = (struct nd_opt_hdr *)((caddr_t)pt + 305 (pt->nd_opt_len << 3))) { 306 if (pt->nd_opt_type != ND_OPT_PREFIX_INFORMATION) 307 continue; 308 pi = (struct nd_opt_prefix_info *)pt; 309 310 if (pi->nd_opt_pi_len != 4) { 311 nd6log((LOG_INFO, 312 "nd6_ra_input: invalid option " 313 "len %d for prefix information option, " 314 "ignored\n", pi->nd_opt_pi_len)); 315 continue; 316 } 317 318 if (128 < pi->nd_opt_pi_prefix_len) { 319 nd6log((LOG_INFO, 320 "nd6_ra_input: invalid prefix " 321 "len %d for prefix information option, " 322 "ignored\n", pi->nd_opt_pi_prefix_len)); 323 continue; 324 } 325 326 if (IN6_IS_ADDR_MULTICAST(&pi->nd_opt_pi_prefix) 327 || IN6_IS_ADDR_LINKLOCAL(&pi->nd_opt_pi_prefix)) { 328 nd6log((LOG_INFO, 329 "nd6_ra_input: invalid prefix " 330 "%s, ignored\n", 331 ip6_sprintf(&pi->nd_opt_pi_prefix))); 332 continue; 333 } 334 335 bzero(&pr, sizeof(pr)); 336 pr.ndpr_prefix.sin6_family = AF_INET6; 337 pr.ndpr_prefix.sin6_len = sizeof(pr.ndpr_prefix); 338 pr.ndpr_prefix.sin6_addr = pi->nd_opt_pi_prefix; 339 pr.ndpr_ifp = (struct ifnet *)m->m_pkthdr.rcvif; 340 341 pr.ndpr_raf_onlink = (pi->nd_opt_pi_flags_reserved & 342 ND_OPT_PI_FLAG_ONLINK) ? 1 : 0; 343 pr.ndpr_raf_auto = (pi->nd_opt_pi_flags_reserved & 344 ND_OPT_PI_FLAG_AUTO) ? 1 : 0; 345 pr.ndpr_plen = pi->nd_opt_pi_prefix_len; 346 pr.ndpr_vltime = ntohl(pi->nd_opt_pi_valid_time); 347 pr.ndpr_pltime = 348 ntohl(pi->nd_opt_pi_preferred_time); 349 350 if (in6_init_prefix_ltimes(&pr)) 351 continue; /* prefix lifetime init failed */ 352 353 prelist_update(&pr, dr, m); 354 } 355 } 356 357 /* 358 * MTU 359 */ 360 if (ndopts.nd_opts_mtu && ndopts.nd_opts_mtu->nd_opt_mtu_len == 1) { 361 u_int32_t mtu = ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu); 362 363 /* lower bound */ 364 if (mtu < IPV6_MMTU) { 365 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu option " 366 "mtu=%d sent from %s, ignoring\n", 367 mtu, ip6_sprintf(&ip6->ip6_src))); 368 goto skip; 369 } 370 371 /* upper bound */ 372 if (ndi->maxmtu) { 373 if (mtu <= ndi->maxmtu) { 374 int change = (ndi->linkmtu != mtu); 375 376 ndi->linkmtu = mtu; 377 if (change) /* in6_maxmtu may change */ 378 in6_setmaxmtu(); 379 } else { 380 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu " 381 "mtu=%d sent from %s; " 382 "exceeds maxmtu %d, ignoring\n", 383 mtu, ip6_sprintf(&ip6->ip6_src), 384 ndi->maxmtu)); 385 } 386 } else { 387 nd6log((LOG_INFO, "nd6_ra_input: mtu option " 388 "mtu=%d sent from %s; maxmtu unknown, " 389 "ignoring\n", 390 mtu, ip6_sprintf(&ip6->ip6_src))); 391 } 392 } 393 394 skip: 395 396 /* 397 * Source link layer address 398 */ 399 { 400 char *lladdr = NULL; 401 int lladdrlen = 0; 402 403 if (ndopts.nd_opts_src_lladdr) { 404 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1); 405 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3; 406 } 407 408 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 409 nd6log((LOG_INFO, 410 "nd6_ra_input: lladdrlen mismatch for %s " 411 "(if %d, RA packet %d)\n", 412 ip6_sprintf(&saddr6), ifp->if_addrlen, lladdrlen - 2)); 413 goto bad; 414 } 415 416 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_ADVERT, 0); 417 418 /* 419 * Installing a link-layer address might change the state of the 420 * router's neighbor cache, which might also affect our on-link 421 * detection of adveritsed prefixes. 422 */ 423 pfxlist_onlink_check(); 424 } 425 426 freeit: 427 m_freem(m); 428 return; 429 430 bad: 431 icmp6stat.icp6s_badra++; 432 m_freem(m); 433 } 434 435 /* 436 * default router list proccessing sub routines 437 */ 438 439 #if 0 440 /* tell the change to user processes watching the routing socket. */ 441 static void 442 nd6_rtmsg(int cmd, struct rtentry *rt) 443 { 444 struct rt_addrinfo info; 445 446 bzero((caddr_t)&info, sizeof(info)); 447 info.rti_info[RTAX_DST] = rt_key(rt); 448 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 449 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 450 if (TAILQ_EMPTY(&rt->rt_ifp->if_addrheads[mycpuid])) { 451 info.rti_info[RTAX_IFP] = NULL; 452 } else { 453 info.rti_info[RTAX_IFP] = 454 (struct sockaddr *) 455 TAILQ_FIRST(&rt->rt_ifp->if_addrheads[mycpuid])->ifa; 456 } 457 info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr; 458 459 rt_missmsg(cmd, &info, rt->rt_flags, 0); 460 } 461 #endif 462 463 void 464 defrouter_addreq(struct nd_defrouter *new) 465 { 466 struct sockaddr_in6 def, mask, gate; 467 468 bzero(&def, sizeof(def)); 469 bzero(&mask, sizeof(mask)); 470 bzero(&gate, sizeof(gate)); 471 472 def.sin6_len = mask.sin6_len = gate.sin6_len 473 = sizeof(struct sockaddr_in6); 474 def.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6; 475 gate.sin6_addr = new->rtaddr; 476 477 rtrequest_global(RTM_ADD, (struct sockaddr *)&def, 478 (struct sockaddr *)&gate, (struct sockaddr *)&mask, 479 RTF_GATEWAY); 480 return; 481 } 482 483 /* Add a route to a given interface as default */ 484 void 485 defrouter_addifreq(struct ifnet *ifp) 486 { 487 struct sockaddr_in6 def, mask; 488 struct ifaddr *ifa; 489 int error, flags; 490 491 bzero(&def, sizeof(def)); 492 bzero(&mask, sizeof(mask)); 493 494 def.sin6_len = mask.sin6_len = sizeof(struct sockaddr_in6); 495 def.sin6_family = mask.sin6_family = AF_INET6; 496 497 /* 498 * Search for an ifaddr beloging to the specified interface. 499 * XXX: An IPv6 address are required to be assigned on the interface. 500 */ 501 if ((ifa = ifaof_ifpforaddr((struct sockaddr *)&def, ifp)) == NULL) { 502 nd6log((LOG_ERR, /* better error? */ 503 "defrouter_addifreq: failed to find an ifaddr " 504 "to install a route to interface %s\n", 505 if_name(ifp))); 506 return; 507 } 508 509 flags = ifa->ifa_flags; 510 error = rtrequest_global(RTM_ADD, 511 (struct sockaddr *)&def, 512 ifa->ifa_addr, 513 (struct sockaddr *)&mask, 514 flags); 515 if (error != 0) { 516 nd6log((LOG_ERR, 517 "defrouter_addifreq: failed to install a route to " 518 "interface %s (errno = %d)\n", 519 if_name(ifp), error)); 520 } 521 } 522 523 struct nd_defrouter * 524 defrouter_lookup(struct in6_addr *addr, struct ifnet *ifp) 525 { 526 struct nd_defrouter *dr; 527 528 for (dr = TAILQ_FIRST(&nd_defrouter); dr; 529 dr = TAILQ_NEXT(dr, dr_entry)) { 530 if (dr->ifp == ifp && IN6_ARE_ADDR_EQUAL(addr, &dr->rtaddr)) 531 return (dr); 532 } 533 534 return (NULL); /* search failed */ 535 } 536 537 void 538 defrouter_delreq(struct nd_defrouter *dr, int dofree) 539 { 540 struct sockaddr_in6 def, mask, gate; 541 542 bzero(&def, sizeof(def)); 543 bzero(&mask, sizeof(mask)); 544 bzero(&gate, sizeof(gate)); 545 546 def.sin6_len = mask.sin6_len = gate.sin6_len 547 = sizeof(struct sockaddr_in6); 548 def.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6; 549 gate.sin6_addr = dr->rtaddr; 550 551 rtrequest_global(RTM_DELETE, 552 (struct sockaddr *)&def, 553 (struct sockaddr *)&gate, 554 (struct sockaddr *)&mask, 555 RTF_GATEWAY); 556 if (dofree) /* XXX: necessary? */ 557 kfree(dr, M_IP6NDP); 558 } 559 560 void 561 defrtrlist_del(struct nd_defrouter *dr) 562 { 563 struct nd_defrouter *deldr = NULL; 564 struct nd_prefix *pr; 565 566 /* 567 * Flush all the routing table entries that use the router 568 * as a next hop. 569 */ 570 if (!ip6_forwarding && ip6_accept_rtadv) { 571 /* above is a good condition? */ 572 rt6_flush(&dr->rtaddr, dr->ifp); 573 } 574 575 if (dr == TAILQ_FIRST(&nd_defrouter)) 576 deldr = dr; /* The router is primary. */ 577 578 TAILQ_REMOVE(&nd_defrouter, dr, dr_entry); 579 580 /* 581 * Also delete all the pointers to the router in each prefix lists. 582 */ 583 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 584 struct nd_pfxrouter *pfxrtr; 585 if ((pfxrtr = pfxrtr_lookup(pr, dr)) != NULL) 586 pfxrtr_del(pfxrtr); 587 } 588 pfxlist_onlink_check(); 589 590 /* 591 * If the router is the primary one, choose a new one. 592 * Note that defrouter_select() will remove the current gateway 593 * from the routing table. 594 */ 595 if (deldr) 596 defrouter_select(); 597 598 kfree(dr, M_IP6NDP); 599 } 600 601 /* 602 * Default Router Selection according to Section 6.3.6 of RFC 2461: 603 * 1) Routers that are reachable or probably reachable should be 604 * preferred. 605 * 2) When no routers on the list are known to be reachable or 606 * probably reachable, routers SHOULD be selected in a round-robin 607 * fashion. 608 * 3) If the Default Router List is empty, assume that all 609 * destinations are on-link. 610 */ 611 void 612 defrouter_select(void) 613 { 614 struct nd_defrouter *dr, anydr; 615 struct rtentry *rt = NULL; 616 struct llinfo_nd6 *ln = NULL; 617 618 mtx_lock(&nd6_mtx); 619 620 /* 621 * Search for a (probably) reachable router from the list. 622 */ 623 for (dr = TAILQ_FIRST(&nd_defrouter); dr; 624 dr = TAILQ_NEXT(dr, dr_entry)) { 625 if ((rt = nd6_lookup(&dr->rtaddr, 0, dr->ifp)) && 626 (ln = (struct llinfo_nd6 *)rt->rt_llinfo) && 627 ND6_IS_LLINFO_PROBREACH(ln)) { 628 /* Got it, and move it to the head */ 629 TAILQ_REMOVE(&nd_defrouter, dr, dr_entry); 630 TAILQ_INSERT_HEAD(&nd_defrouter, dr, dr_entry); 631 break; 632 } 633 } 634 635 if ((dr = TAILQ_FIRST(&nd_defrouter))) { 636 /* 637 * De-install the previous default gateway and install 638 * a new one. 639 * Note that if there is no reachable router in the list, 640 * the head entry will be used anyway. 641 * XXX: do we have to check the current routing table entry? 642 */ 643 bzero(&anydr, sizeof(anydr)); 644 defrouter_delreq(&anydr, 0); 645 defrouter_addreq(dr); 646 } 647 else { 648 /* 649 * The Default Router List is empty, so install the default 650 * route to an inteface. 651 * XXX: The specification does not say this mechanism should 652 * be restricted to hosts, but this would be not useful 653 * (even harmful) for routers. 654 */ 655 if (!ip6_forwarding) { 656 /* 657 * De-install the current default route 658 * in advance. 659 */ 660 bzero(&anydr, sizeof(anydr)); 661 defrouter_delreq(&anydr, 0); 662 if (nd6_defifp) { 663 /* 664 * Install a route to the default interface 665 * as default route. 666 * XXX: we enable this for host only, because 667 * this may override a default route installed 668 * a user process (e.g. routing daemon) in a 669 * router case. 670 */ 671 defrouter_addifreq(nd6_defifp); 672 } else { 673 nd6log((LOG_INFO, "defrouter_select: " 674 "there's no default router and no default" 675 " interface\n")); 676 } 677 } 678 } 679 mtx_unlock(&nd6_mtx); 680 return; 681 } 682 683 static struct nd_defrouter * 684 defrtrlist_update(struct nd_defrouter *new) 685 { 686 struct nd_defrouter *dr, *n; 687 688 mtx_lock(&nd6_mtx); 689 690 if ((dr = defrouter_lookup(&new->rtaddr, new->ifp)) != NULL) { 691 /* entry exists */ 692 if (new->rtlifetime == 0) { 693 defrtrlist_del(dr); 694 dr = NULL; 695 } else { 696 /* override */ 697 dr->flags = new->flags; /* xxx flag check */ 698 dr->rtlifetime = new->rtlifetime; 699 dr->expire = new->expire; 700 } 701 mtx_unlock(&nd6_mtx); 702 return (dr); 703 } 704 705 /* entry does not exist */ 706 if (new->rtlifetime == 0) { 707 mtx_unlock(&nd6_mtx); 708 return (NULL); 709 } 710 711 n = (struct nd_defrouter *)kmalloc(sizeof(*n), M_IP6NDP, 712 M_NOWAIT | M_ZERO); 713 if (n == NULL) { 714 mtx_unlock(&nd6_mtx); 715 return (NULL); 716 } 717 *n = *new; 718 719 /* 720 * Insert the new router at the end of the Default Router List. 721 * If there is no other router, install it anyway. Otherwise, 722 * just continue to use the current default router. 723 */ 724 TAILQ_INSERT_TAIL(&nd_defrouter, n, dr_entry); 725 if (TAILQ_FIRST(&nd_defrouter) == n) 726 defrouter_select(); 727 mtx_unlock(&nd6_mtx); 728 return (n); 729 } 730 731 static struct nd_pfxrouter * 732 pfxrtr_lookup(struct nd_prefix *pr, struct nd_defrouter *dr) 733 { 734 struct nd_pfxrouter *search; 735 736 for (search = pr->ndpr_advrtrs.lh_first; search; search = search->pfr_next) { 737 if (search->router == dr) 738 break; 739 } 740 741 return (search); 742 } 743 744 static void 745 pfxrtr_add(struct nd_prefix *pr, struct nd_defrouter *dr) 746 { 747 struct nd_pfxrouter *new; 748 749 new = (struct nd_pfxrouter *)kmalloc(sizeof(*new), M_IP6NDP, 750 M_NOWAIT | M_ZERO); 751 if (new == NULL) 752 return; 753 new->router = dr; 754 755 LIST_INSERT_HEAD(&pr->ndpr_advrtrs, new, pfr_entry); 756 757 pfxlist_onlink_check(); 758 } 759 760 static void 761 pfxrtr_del(struct nd_pfxrouter *pfr) 762 { 763 LIST_REMOVE(pfr, pfr_entry); 764 kfree(pfr, M_IP6NDP); 765 } 766 767 struct nd_prefix * 768 nd6_prefix_lookup(struct nd_prefix *pr) 769 { 770 struct nd_prefix *search; 771 772 for (search = nd_prefix.lh_first; search; search = search->ndpr_next) { 773 if (pr->ndpr_ifp == search->ndpr_ifp && 774 pr->ndpr_plen == search->ndpr_plen && 775 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr, 776 &search->ndpr_prefix.sin6_addr, 777 pr->ndpr_plen) 778 ) { 779 break; 780 } 781 } 782 783 return (search); 784 } 785 786 int 787 nd6_prelist_add(struct nd_prefix *pr, struct nd_defrouter *dr, 788 struct nd_prefix **newp) 789 { 790 struct nd_prefix *new = NULL; 791 int i; 792 793 new = (struct nd_prefix *)kmalloc(sizeof(*new), M_IP6NDP, 794 M_NOWAIT | M_ZERO); 795 if (new == NULL) 796 return ENOMEM; 797 *new = *pr; 798 if (newp != NULL) 799 *newp = new; 800 801 /* initilization */ 802 LIST_INIT(&new->ndpr_advrtrs); 803 in6_prefixlen2mask(&new->ndpr_mask, new->ndpr_plen); 804 /* make prefix in the canonical form */ 805 for (i = 0; i < 4; i++) 806 new->ndpr_prefix.sin6_addr.s6_addr32[i] &= 807 new->ndpr_mask.s6_addr32[i]; 808 809 mtx_lock(&nd6_mtx); 810 /* link ndpr_entry to nd_prefix list */ 811 LIST_INSERT_HEAD(&nd_prefix, new, ndpr_entry); 812 mtx_unlock(&nd6_mtx); 813 814 /* ND_OPT_PI_FLAG_ONLINK processing */ 815 if (new->ndpr_raf_onlink) { 816 int e; 817 818 if ((e = nd6_prefix_onlink(new)) != 0) { 819 nd6log((LOG_ERR, "nd6_prelist_add: failed to make " 820 "the prefix %s/%d on-link on %s (errno=%d)\n", 821 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 822 pr->ndpr_plen, if_name(pr->ndpr_ifp), e)); 823 /* proceed anyway. XXX: is it correct? */ 824 } 825 } 826 827 if (dr) { 828 pfxrtr_add(new, dr); 829 } 830 831 return 0; 832 } 833 834 void 835 prelist_remove(struct nd_prefix *pr) 836 { 837 struct nd_pfxrouter *pfr, *next; 838 int e; 839 840 /* make sure to invalidate the prefix until it is really freed. */ 841 pr->ndpr_vltime = 0; 842 pr->ndpr_pltime = 0; 843 #if 0 844 /* 845 * Though these flags are now meaningless, we'd rather keep the value 846 * not to confuse users when executing "ndp -p". 847 */ 848 pr->ndpr_raf_onlink = 0; 849 pr->ndpr_raf_auto = 0; 850 #endif 851 if ((pr->ndpr_stateflags & NDPRF_ONLINK) && 852 (e = nd6_prefix_offlink(pr)) != 0) { 853 nd6log((LOG_ERR, "prelist_remove: failed to make %s/%d offlink " 854 "on %s, errno=%d\n", 855 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 856 pr->ndpr_plen, if_name(pr->ndpr_ifp), e)); 857 /* what should we do? */ 858 } 859 860 if (pr->ndpr_refcnt > 0) 861 return; /* notice here? */ 862 863 mtx_lock(&nd6_mtx); 864 865 /* unlink ndpr_entry from nd_prefix list */ 866 LIST_REMOVE(pr, ndpr_entry); 867 868 /* free list of routers that adversed the prefix */ 869 for (pfr = pr->ndpr_advrtrs.lh_first; pfr; pfr = next) { 870 next = pfr->pfr_next; 871 872 kfree(pfr, M_IP6NDP); 873 } 874 mtx_unlock(&nd6_mtx); 875 876 kfree(pr, M_IP6NDP); 877 878 pfxlist_onlink_check(); 879 } 880 881 /* 882 * Parameters: 883 * dr: may be NULL 884 */ 885 int 886 prelist_update(struct nd_prefix *new, struct nd_defrouter *dr, struct mbuf *m) 887 { 888 struct in6_ifaddr *ia6 = NULL, *ia6_match = NULL; 889 struct ifaddr_container *ifac; 890 struct ifnet *ifp = new->ndpr_ifp; 891 struct nd_prefix *pr; 892 int error = 0; 893 int auth; 894 struct in6_addrlifetime lt6_tmp; 895 896 auth = 0; 897 mtx_lock(&nd6_mtx); 898 if (m) { 899 /* 900 * Authenticity for NA consists authentication for 901 * both IP header and IP datagrams, doesn't it ? 902 */ 903 #if defined(M_AUTHIPHDR) && defined(M_AUTHIPDGM) 904 auth = (m->m_flags & M_AUTHIPHDR 905 && m->m_flags & M_AUTHIPDGM) ? 1 : 0; 906 #endif 907 } 908 909 910 if ((pr = nd6_prefix_lookup(new)) != NULL) { 911 /* 912 * nd6_prefix_lookup() ensures that pr and new have the same 913 * prefix on a same interface. 914 */ 915 916 /* 917 * Update prefix information. Note that the on-link (L) bit 918 * and the autonomous (A) bit should NOT be changed from 1 919 * to 0. 920 */ 921 if (new->ndpr_raf_onlink == 1) 922 pr->ndpr_raf_onlink = 1; 923 if (new->ndpr_raf_auto == 1) 924 pr->ndpr_raf_auto = 1; 925 if (new->ndpr_raf_onlink) { 926 pr->ndpr_vltime = new->ndpr_vltime; 927 pr->ndpr_pltime = new->ndpr_pltime; 928 pr->ndpr_preferred = new->ndpr_preferred; 929 pr->ndpr_expire = new->ndpr_expire; 930 } 931 932 if (new->ndpr_raf_onlink && 933 !(pr->ndpr_stateflags & NDPRF_ONLINK)) { 934 int e; 935 936 if ((e = nd6_prefix_onlink(pr)) != 0) { 937 nd6log((LOG_ERR, 938 "prelist_update: failed to make " 939 "the prefix %s/%d on-link on %s " 940 "(errno=%d)\n", 941 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 942 pr->ndpr_plen, if_name(pr->ndpr_ifp), e)); 943 /* proceed anyway. XXX: is it correct? */ 944 } 945 } 946 947 if (dr && pfxrtr_lookup(pr, dr) == NULL) 948 pfxrtr_add(pr, dr); 949 } else { 950 struct nd_prefix *newpr = NULL; 951 952 if (new->ndpr_vltime == 0) 953 goto end; 954 if (new->ndpr_raf_onlink == 0 && new->ndpr_raf_auto == 0) 955 goto end; 956 957 bzero(&new->ndpr_addr, sizeof(struct in6_addr)); 958 959 error = nd6_prelist_add(new, dr, &newpr); 960 if (error != 0 || newpr == NULL) { 961 nd6log((LOG_NOTICE, "prelist_update: " 962 "nd6_prelist_add failed for %s/%d on %s " 963 "errno=%d, returnpr=%p\n", 964 ip6_sprintf(&new->ndpr_prefix.sin6_addr), 965 new->ndpr_plen, if_name(new->ndpr_ifp), 966 error, newpr)); 967 goto end; /* we should just give up in this case. */ 968 } 969 970 /* 971 * XXX: from the ND point of view, we can ignore a prefix 972 * with the on-link bit being zero. However, we need a 973 * prefix structure for references from autoconfigured 974 * addresses. Thus, we explicitly make suret that the prefix 975 * itself expires now. 976 */ 977 if (newpr->ndpr_raf_onlink == 0) { 978 newpr->ndpr_vltime = 0; 979 newpr->ndpr_pltime = 0; 980 in6_init_prefix_ltimes(newpr); 981 } 982 983 pr = newpr; 984 } 985 986 /* 987 * Address autoconfiguration based on Section 5.5.3 of RFC 2462. 988 * Note that pr must be non NULL at this point. 989 */ 990 991 /* 5.5.3 (a). Ignore the prefix without the A bit set. */ 992 if (!new->ndpr_raf_auto) 993 goto afteraddrconf; 994 995 /* 996 * 5.5.3 (b). the link-local prefix should have been ignored in 997 * nd6_ra_input. 998 */ 999 1000 /* 1001 * 5.5.3 (c). Consistency check on lifetimes: pltime <= vltime. 1002 * This should have been done in nd6_ra_input. 1003 */ 1004 1005 /* 1006 * 5.5.3 (d). If the prefix advertised does not match the prefix of an 1007 * address already in the list, and the Valid Lifetime is not 0, 1008 * form an address. Note that even a manually configured address 1009 * should reject autoconfiguration of a new address. 1010 */ 1011 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1012 struct ifaddr *ifa = ifac->ifa; 1013 struct in6_ifaddr *ifa6; 1014 int ifa_plen; 1015 u_int32_t storedlifetime; 1016 1017 if (ifa->ifa_addr->sa_family != AF_INET6) 1018 continue; 1019 1020 ifa6 = (struct in6_ifaddr *)ifa; 1021 1022 /* 1023 * Spec is not clear here, but I believe we should concentrate 1024 * on unicast (i.e. not anycast) addresses. 1025 * XXX: other ia6_flags? detached or duplicated? 1026 */ 1027 if (ifa6->ia6_flags & IN6_IFF_ANYCAST) 1028 continue; 1029 1030 ifa_plen = in6_mask2len(&ifa6->ia_prefixmask.sin6_addr, NULL); 1031 if (ifa_plen != new->ndpr_plen || 1032 !in6_are_prefix_equal(&ifa6->ia_addr.sin6_addr, 1033 &new->ndpr_prefix.sin6_addr, 1034 ifa_plen)) 1035 continue; 1036 1037 if (ia6_match == NULL) /* remember the first one */ 1038 ia6_match = ifa6; 1039 1040 if (!(ifa6->ia6_flags & IN6_IFF_AUTOCONF)) 1041 continue; 1042 1043 /* 1044 * An already autoconfigured address matched. Now that we 1045 * are sure there is at least one matched address, we can 1046 * proceed to 5.5.3. (e): update the lifetimes according to the 1047 * "two hours" rule and the privacy extension. 1048 */ 1049 #define TWOHOUR (120*60) 1050 lt6_tmp = ifa6->ia6_lifetime; 1051 1052 if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME) 1053 storedlifetime = ND6_INFINITE_LIFETIME; 1054 else if (IFA6_IS_INVALID(ifa6)) 1055 storedlifetime = 0; 1056 else 1057 storedlifetime = lt6_tmp.ia6t_expire - time_uptime; 1058 1059 /* when not updating, keep the current stored lifetime. */ 1060 lt6_tmp.ia6t_vltime = storedlifetime; 1061 1062 if (TWOHOUR < new->ndpr_vltime || 1063 storedlifetime < new->ndpr_vltime) { 1064 lt6_tmp.ia6t_vltime = new->ndpr_vltime; 1065 } else if (storedlifetime <= TWOHOUR 1066 #if 0 1067 /* 1068 * This condition is logically redundant, so we just 1069 * omit it. 1070 * See IPng 6712, 6717, and 6721. 1071 */ 1072 && new->ndpr_vltime <= storedlifetime 1073 #endif 1074 ) { 1075 if (auth) { 1076 lt6_tmp.ia6t_vltime = new->ndpr_vltime; 1077 } 1078 } else { 1079 /* 1080 * new->ndpr_vltime <= TWOHOUR && 1081 * TWOHOUR < storedlifetime 1082 */ 1083 lt6_tmp.ia6t_vltime = TWOHOUR; 1084 } 1085 1086 /* The 2 hour rule is not imposed for preferred lifetime. */ 1087 lt6_tmp.ia6t_pltime = new->ndpr_pltime; 1088 1089 in6_init_address_ltimes(pr, <6_tmp); 1090 1091 /* 1092 * When adjusting the lifetimes of an existing temporary 1093 * address, only lower the lifetimes. 1094 * RFC 3041 3.3. (1). 1095 * XXX: how should we modify ia6t_[pv]ltime? 1096 */ 1097 if (ifa6->ia6_flags & IN6_IFF_TEMPORARY) { 1098 if (lt6_tmp.ia6t_expire == 0 || /* no expire */ 1099 lt6_tmp.ia6t_expire > 1100 ifa6->ia6_lifetime.ia6t_expire) { 1101 lt6_tmp.ia6t_expire = 1102 ifa6->ia6_lifetime.ia6t_expire; 1103 } 1104 if (lt6_tmp.ia6t_preferred == 0 || /* no expire */ 1105 lt6_tmp.ia6t_preferred > 1106 ifa6->ia6_lifetime.ia6t_preferred) { 1107 lt6_tmp.ia6t_preferred = 1108 ifa6->ia6_lifetime.ia6t_preferred; 1109 } 1110 } 1111 1112 ifa6->ia6_lifetime = lt6_tmp; 1113 } 1114 if (ia6_match == NULL && new->ndpr_vltime) { 1115 /* 1116 * No address matched and the valid lifetime is non-zero. 1117 * Create a new address. 1118 */ 1119 if ((ia6 = in6_ifadd(new, NULL)) != NULL) { 1120 /* 1121 * note that we should use pr (not new) for reference. 1122 */ 1123 pr->ndpr_refcnt++; 1124 ia6->ia6_ndpr = pr; 1125 1126 #if 0 1127 /* XXXYYY Don't do this, according to Jinmei. */ 1128 pr->ndpr_addr = new->ndpr_addr; 1129 #endif 1130 1131 /* 1132 * RFC 3041 3.3 (2). 1133 * When a new public address is created as described 1134 * in RFC2462, also create a new temporary address. 1135 * 1136 * RFC 3041 3.5. 1137 * When an interface connects to a new link, a new 1138 * randomized interface identifier should be generated 1139 * immediately together with a new set of temporary 1140 * addresses. Thus, we specifiy 1 as the 2nd arg of 1141 * in6_tmpifadd(). 1142 */ 1143 if (ip6_use_tempaddr) { 1144 int e; 1145 if ((e = in6_tmpifadd(ia6, 1)) != 0) { 1146 nd6log((LOG_NOTICE, "prelist_update: " 1147 "failed to create a temporary " 1148 "address, errno=%d\n", 1149 e)); 1150 } 1151 } 1152 1153 /* 1154 * A newly added address might affect the status 1155 * of other addresses, so we check and update it. 1156 * XXX: what if address duplication happens? 1157 */ 1158 pfxlist_onlink_check(); 1159 } else { 1160 /* just set an error. do not bark here. */ 1161 error = EADDRNOTAVAIL; /* XXX: might be unused. */ 1162 } 1163 } 1164 1165 afteraddrconf: 1166 1167 end: 1168 mtx_unlock(&nd6_mtx); 1169 return error; 1170 } 1171 1172 /* 1173 * A supplement function used in the on-link detection below; 1174 * detect if a given prefix has a (probably) reachable advertising router. 1175 * XXX: lengthy function name... 1176 */ 1177 static struct nd_pfxrouter * 1178 find_pfxlist_reachable_router(struct nd_prefix *pr) 1179 { 1180 struct nd_pfxrouter *pfxrtr; 1181 struct rtentry *rt; 1182 struct llinfo_nd6 *ln; 1183 1184 for (pfxrtr = LIST_FIRST(&pr->ndpr_advrtrs); pfxrtr; 1185 pfxrtr = LIST_NEXT(pfxrtr, pfr_entry)) { 1186 if ((rt = nd6_lookup(&pfxrtr->router->rtaddr, 0, 1187 pfxrtr->router->ifp)) && 1188 (ln = (struct llinfo_nd6 *)rt->rt_llinfo) && 1189 ND6_IS_LLINFO_PROBREACH(ln)) 1190 break; /* found */ 1191 } 1192 1193 return (pfxrtr); 1194 1195 } 1196 1197 /* 1198 * Check if each prefix in the prefix list has at least one available router 1199 * that advertised the prefix (a router is "available" if its neighbor cache 1200 * entry is reachable or probably reachable). 1201 * If the check fails, the prefix may be off-link, because, for example, 1202 * we have moved from the network but the lifetime of the prefix has not 1203 * expired yet. So we should not use the prefix if there is another prefix 1204 * that has an available router. 1205 * But, if there is no prefix that has an available router, we still regards 1206 * all the prefixes as on-link. This is because we can't tell if all the 1207 * routers are simply dead or if we really moved from the network and there 1208 * is no router around us. 1209 */ 1210 void 1211 pfxlist_onlink_check(void) 1212 { 1213 struct nd_prefix *pr; 1214 struct in6_ifaddr *ifa; 1215 1216 /* 1217 * Check if there is a prefix that has a reachable advertising 1218 * router. 1219 */ 1220 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 1221 if (pr->ndpr_raf_onlink && find_pfxlist_reachable_router(pr)) 1222 break; 1223 } 1224 1225 if (pr) { 1226 /* 1227 * There is at least one prefix that has a reachable router. 1228 * Detach prefixes which have no reachable advertising 1229 * router, and attach other prefixes. 1230 */ 1231 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 1232 /* XXX: a link-local prefix should never be detached */ 1233 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr)) 1234 continue; 1235 1236 /* 1237 * we aren't interested in prefixes without the L bit 1238 * set. 1239 */ 1240 if (pr->ndpr_raf_onlink == 0) 1241 continue; 1242 1243 if (!(pr->ndpr_stateflags & NDPRF_DETACHED) && 1244 find_pfxlist_reachable_router(pr) == NULL) 1245 pr->ndpr_stateflags |= NDPRF_DETACHED; 1246 if ((pr->ndpr_stateflags & NDPRF_DETACHED) && 1247 find_pfxlist_reachable_router(pr) != NULL) 1248 pr->ndpr_stateflags &= ~NDPRF_DETACHED; 1249 } 1250 } else { 1251 /* there is no prefix that has a reachable router */ 1252 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 1253 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr)) 1254 continue; 1255 1256 if (pr->ndpr_raf_onlink == 0) 1257 continue; 1258 1259 if (pr->ndpr_stateflags & NDPRF_DETACHED) 1260 pr->ndpr_stateflags &= ~NDPRF_DETACHED; 1261 } 1262 } 1263 1264 /* 1265 * Remove each interface route associated with a (just) detached 1266 * prefix, and reinstall the interface route for a (just) attached 1267 * prefix. Note that all attempt of reinstallation does not 1268 * necessarily success, when a same prefix is shared among multiple 1269 * interfaces. Such cases will be handled in nd6_prefix_onlink, 1270 * so we don't have to care about them. 1271 */ 1272 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 1273 int e; 1274 1275 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr)) 1276 continue; 1277 1278 if (pr->ndpr_raf_onlink == 0) 1279 continue; 1280 1281 if ((pr->ndpr_stateflags & NDPRF_DETACHED) && 1282 (pr->ndpr_stateflags & NDPRF_ONLINK)) { 1283 if ((e = nd6_prefix_offlink(pr)) != 0) { 1284 nd6log((LOG_ERR, 1285 "pfxlist_onlink_check: failed to " 1286 "make %s/%d offlink, errno=%d\n", 1287 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 1288 pr->ndpr_plen, e)); 1289 } 1290 } 1291 if (!(pr->ndpr_stateflags & NDPRF_DETACHED) && 1292 !(pr->ndpr_stateflags & NDPRF_ONLINK) && 1293 pr->ndpr_raf_onlink) { 1294 if ((e = nd6_prefix_onlink(pr)) != 0) { 1295 nd6log((LOG_ERR, 1296 "pfxlist_onlink_check: failed to " 1297 "make %s/%d offlink, errno=%d\n", 1298 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 1299 pr->ndpr_plen, e)); 1300 } 1301 } 1302 } 1303 1304 /* 1305 * Changes on the prefix status might affect address status as well. 1306 * Make sure that all addresses derived from an attached prefix are 1307 * attached, and that all addresses derived from a detached prefix are 1308 * detached. Note, however, that a manually configured address should 1309 * always be attached. 1310 * The precise detection logic is same as the one for prefixes. 1311 */ 1312 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) { 1313 if (!(ifa->ia6_flags & IN6_IFF_AUTOCONF)) 1314 continue; 1315 1316 if (ifa->ia6_ndpr == NULL) { 1317 /* 1318 * This can happen when we first configure the address 1319 * (i.e. the address exists, but the prefix does not). 1320 * XXX: complicated relationships... 1321 */ 1322 continue; 1323 } 1324 1325 if (find_pfxlist_reachable_router(ifa->ia6_ndpr)) 1326 break; 1327 } 1328 if (ifa) { 1329 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) { 1330 if (!(ifa->ia6_flags & IN6_IFF_AUTOCONF)) 1331 continue; 1332 1333 if (ifa->ia6_ndpr == NULL) /* XXX: see above. */ 1334 continue; 1335 1336 if (find_pfxlist_reachable_router(ifa->ia6_ndpr)) 1337 ifa->ia6_flags &= ~IN6_IFF_DETACHED; 1338 else 1339 ifa->ia6_flags |= IN6_IFF_DETACHED; 1340 } 1341 } 1342 else { 1343 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) { 1344 if (!(ifa->ia6_flags & IN6_IFF_AUTOCONF)) 1345 continue; 1346 1347 ifa->ia6_flags &= ~IN6_IFF_DETACHED; 1348 } 1349 } 1350 } 1351 1352 int 1353 nd6_prefix_onlink(struct nd_prefix *pr) 1354 { 1355 struct ifaddr *ifa; 1356 struct ifnet *ifp = pr->ndpr_ifp; 1357 struct sockaddr_in6 mask6; 1358 struct nd_prefix *opr; 1359 u_long rtflags; 1360 int error = 0; 1361 1362 /* sanity check */ 1363 if (pr->ndpr_stateflags & NDPRF_ONLINK) { 1364 nd6log((LOG_ERR, 1365 "nd6_prefix_onlink: %s/%d is already on-link\n", 1366 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen); 1367 return (EEXIST)); 1368 } 1369 1370 /* 1371 * Add the interface route associated with the prefix. Before 1372 * installing the route, check if there's the same prefix on another 1373 * interface, and the prefix has already installed the interface route. 1374 * Although such a configuration is expected to be rare, we explicitly 1375 * allow it. 1376 */ 1377 for (opr = nd_prefix.lh_first; opr; opr = opr->ndpr_next) { 1378 if (opr == pr) 1379 continue; 1380 1381 if (!(opr->ndpr_stateflags & NDPRF_ONLINK)) 1382 continue; 1383 1384 if (opr->ndpr_plen == pr->ndpr_plen && 1385 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr, 1386 &opr->ndpr_prefix.sin6_addr, 1387 pr->ndpr_plen)) 1388 return (0); 1389 } 1390 1391 /* 1392 * We prefer link-local addresses as the associated interface address. 1393 */ 1394 /* search for a link-local addr */ 1395 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 1396 IN6_IFF_NOTREADY| 1397 IN6_IFF_ANYCAST); 1398 if (ifa == NULL) { 1399 struct ifaddr_container *ifac; 1400 1401 /* XXX: freebsd does not have ifa_ifwithaf */ 1402 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1403 if (ifac->ifa->ifa_addr->sa_family == AF_INET6) { 1404 ifa = ifac->ifa; 1405 break; 1406 } 1407 } 1408 /* should we care about ia6_flags? */ 1409 } 1410 if (ifa == NULL) { 1411 /* 1412 * This can still happen, when, for example, we receive an RA 1413 * containing a prefix with the L bit set and the A bit clear, 1414 * after removing all IPv6 addresses on the receiving 1415 * interface. This should, of course, be rare though. 1416 */ 1417 nd6log((LOG_NOTICE, 1418 "nd6_prefix_onlink: failed to find any ifaddr" 1419 " to add route for a prefix(%s/%d) on %s\n", 1420 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 1421 pr->ndpr_plen, if_name(ifp))); 1422 return (0); 1423 } 1424 1425 /* 1426 * in6_ifinit() sets nd6_rtrequest to ifa_rtrequest for all ifaddrs. 1427 * ifa->ifa_rtrequest = nd6_rtrequest; 1428 */ 1429 bzero(&mask6, sizeof(mask6)); 1430 mask6.sin6_len = sizeof(mask6); 1431 mask6.sin6_addr = pr->ndpr_mask; 1432 rtflags = ifa->ifa_flags | RTF_CLONING | RTF_UP; 1433 if (nd6_need_cache(ifp)) { 1434 /* explicitly set in case ifa_flags does not set the flag. */ 1435 rtflags |= RTF_CLONING; 1436 } else { 1437 /* 1438 * explicitly clear the cloning bit in case ifa_flags sets it. 1439 */ 1440 rtflags &= ~RTF_CLONING; 1441 } 1442 error = rtrequest_global(RTM_ADD, 1443 (struct sockaddr *)&pr->ndpr_prefix, 1444 ifa->ifa_addr, 1445 (struct sockaddr *)&mask6, 1446 rtflags); 1447 if (error == 0) { 1448 pr->ndpr_stateflags |= NDPRF_ONLINK; 1449 } 1450 else { 1451 nd6log((LOG_ERR, "nd6_prefix_onlink: failed to add route for a" 1452 " prefix (%s/%d) on %s, gw=%s, mask=%s, flags=%lx " 1453 "errno = %d\n", 1454 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 1455 pr->ndpr_plen, if_name(ifp), 1456 ip6_sprintf(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr), 1457 ip6_sprintf(&mask6.sin6_addr), rtflags, error)); 1458 } 1459 return (error); 1460 } 1461 1462 int 1463 nd6_prefix_offlink(struct nd_prefix *pr) 1464 { 1465 int error = 0; 1466 struct ifnet *ifp = pr->ndpr_ifp; 1467 struct nd_prefix *opr; 1468 struct sockaddr_in6 sa6, mask6; 1469 1470 /* sanity check */ 1471 if (!(pr->ndpr_stateflags & NDPRF_ONLINK)) { 1472 nd6log((LOG_ERR, 1473 "nd6_prefix_offlink: %s/%d is already off-link\n", 1474 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen)); 1475 return (EEXIST); 1476 } 1477 1478 bzero(&sa6, sizeof(sa6)); 1479 sa6.sin6_family = AF_INET6; 1480 sa6.sin6_len = sizeof(sa6); 1481 bcopy(&pr->ndpr_prefix.sin6_addr, &sa6.sin6_addr, 1482 sizeof(struct in6_addr)); 1483 bzero(&mask6, sizeof(mask6)); 1484 mask6.sin6_family = AF_INET6; 1485 mask6.sin6_len = sizeof(sa6); 1486 bcopy(&pr->ndpr_mask, &mask6.sin6_addr, sizeof(struct in6_addr)); 1487 error = rtrequest_global(RTM_DELETE, 1488 (struct sockaddr *)&sa6, 1489 NULL, 1490 (struct sockaddr *)&mask6, 1491 0); 1492 if (error == 0) { 1493 pr->ndpr_stateflags &= ~NDPRF_ONLINK; 1494 1495 /* 1496 * There might be the same prefix on another interface, 1497 * the prefix which could not be on-link just because we have 1498 * the interface route (see comments in nd6_prefix_onlink). 1499 * If there's one, try to make the prefix on-link on the 1500 * interface. 1501 */ 1502 for (opr = nd_prefix.lh_first; opr; opr = opr->ndpr_next) { 1503 if (opr == pr) 1504 continue; 1505 1506 if (opr->ndpr_stateflags & NDPRF_ONLINK) 1507 continue; 1508 1509 /* 1510 * KAME specific: detached prefixes should not be 1511 * on-link. 1512 */ 1513 if (opr->ndpr_stateflags & NDPRF_DETACHED) 1514 continue; 1515 1516 if (opr->ndpr_plen == pr->ndpr_plen && 1517 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr, 1518 &opr->ndpr_prefix.sin6_addr, 1519 pr->ndpr_plen)) { 1520 int e; 1521 1522 if ((e = nd6_prefix_onlink(opr)) != 0) { 1523 nd6log((LOG_ERR, 1524 "nd6_prefix_offlink: failed to " 1525 "recover a prefix %s/%d from %s " 1526 "to %s (errno = %d)\n", 1527 ip6_sprintf(&opr->ndpr_prefix.sin6_addr), 1528 opr->ndpr_plen, if_name(ifp), 1529 if_name(opr->ndpr_ifp), e)); 1530 } 1531 } 1532 } 1533 } 1534 else { 1535 /* XXX: can we still set the NDPRF_ONLINK flag? */ 1536 nd6log((LOG_ERR, 1537 "nd6_prefix_offlink: failed to delete route: " 1538 "%s/%d on %s (errno = %d)\n", 1539 ip6_sprintf(&sa6.sin6_addr), pr->ndpr_plen, if_name(ifp), 1540 error)); 1541 } 1542 1543 return (error); 1544 } 1545 1546 /* 1547 * Parameters: 1548 * ifid: Mobile IPv6 addition 1549 */ 1550 static struct in6_ifaddr * 1551 in6_ifadd(struct nd_prefix *pr, struct in6_addr *ifid) 1552 { 1553 struct ifnet *ifp = pr->ndpr_ifp; 1554 struct ifaddr *ifa; 1555 struct in6_aliasreq ifra; 1556 struct in6_ifaddr *ia, *ib; 1557 int error, plen0; 1558 struct in6_addr mask; 1559 int prefixlen = pr->ndpr_plen; 1560 1561 in6_len2mask(&mask, prefixlen); 1562 1563 /* 1564 * find a link-local address (will be interface ID). 1565 * Is it really mandatory? Theoretically, a global or a site-local 1566 * address can be configured without a link-local address, if we 1567 * have a unique interface identifier... 1568 * 1569 * it is not mandatory to have a link-local address, we can generate 1570 * interface identifier on the fly. we do this because: 1571 * (1) it should be the easiest way to find interface identifier. 1572 * (2) RFC2462 5.4 suggesting the use of the same interface identifier 1573 * for multiple addresses on a single interface, and possible shortcut 1574 * of DAD. we omitted DAD for this reason in the past. 1575 * (3) a user can prevent autoconfiguration of global address 1576 * by removing link-local address by hand (this is partly because we 1577 * don't have other way to control the use of IPv6 on a interface. 1578 * this has been our design choice - cf. NRL's "ifconfig auto"). 1579 * (4) it is easier to manage when an interface has addresses 1580 * with the same interface identifier, than to have multiple addresses 1581 * with different interface identifiers. 1582 * 1583 * Mobile IPv6 addition: allow for caller to specify a wished interface 1584 * ID. This is to not break connections when moving addresses between 1585 * interfaces. 1586 */ 1587 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0);/* 0 is OK? */ 1588 if (ifa) 1589 ib = (struct in6_ifaddr *)ifa; 1590 else 1591 return NULL; 1592 1593 #if 0 /* don't care link local addr state, and always do DAD */ 1594 /* if link-local address is not eligible, do not autoconfigure. */ 1595 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) { 1596 kprintf("in6_ifadd: link-local address not ready\n"); 1597 return NULL; 1598 } 1599 #endif 1600 1601 /* prefixlen + ifidlen must be equal to 128 */ 1602 plen0 = in6_mask2len(&ib->ia_prefixmask.sin6_addr, NULL); 1603 if (prefixlen != plen0) { 1604 nd6log((LOG_INFO, "in6_ifadd: wrong prefixlen for %s " 1605 "(prefix=%d ifid=%d)\n", 1606 if_name(ifp), prefixlen, 128 - plen0)); 1607 return NULL; 1608 } 1609 1610 /* make ifaddr */ 1611 1612 bzero(&ifra, sizeof(ifra)); 1613 /* 1614 * in6_update_ifa() does not use ifra_name, but we accurately set it 1615 * for safety. 1616 */ 1617 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 1618 ifra.ifra_addr.sin6_family = AF_INET6; 1619 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 1620 /* prefix */ 1621 bcopy(&pr->ndpr_prefix.sin6_addr, &ifra.ifra_addr.sin6_addr, 1622 sizeof(ifra.ifra_addr.sin6_addr)); 1623 ifra.ifra_addr.sin6_addr.s6_addr32[0] &= mask.s6_addr32[0]; 1624 ifra.ifra_addr.sin6_addr.s6_addr32[1] &= mask.s6_addr32[1]; 1625 ifra.ifra_addr.sin6_addr.s6_addr32[2] &= mask.s6_addr32[2]; 1626 ifra.ifra_addr.sin6_addr.s6_addr32[3] &= mask.s6_addr32[3]; 1627 1628 /* interface ID */ 1629 if (ifid == NULL || IN6_IS_ADDR_UNSPECIFIED(ifid)) 1630 ifid = &ib->ia_addr.sin6_addr; 1631 ifra.ifra_addr.sin6_addr.s6_addr32[0] 1632 |= (ifid->s6_addr32[0] & ~mask.s6_addr32[0]); 1633 ifra.ifra_addr.sin6_addr.s6_addr32[1] 1634 |= (ifid->s6_addr32[1] & ~mask.s6_addr32[1]); 1635 ifra.ifra_addr.sin6_addr.s6_addr32[2] 1636 |= (ifid->s6_addr32[2] & ~mask.s6_addr32[2]); 1637 ifra.ifra_addr.sin6_addr.s6_addr32[3] 1638 |= (ifid->s6_addr32[3] & ~mask.s6_addr32[3]); 1639 1640 /* new prefix mask. */ 1641 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 1642 ifra.ifra_prefixmask.sin6_family = AF_INET6; 1643 bcopy(&mask, &ifra.ifra_prefixmask.sin6_addr, 1644 sizeof(ifra.ifra_prefixmask.sin6_addr)); 1645 1646 /* 1647 * lifetime. 1648 * XXX: in6_init_address_ltimes would override these values later. 1649 * We should reconsider this logic. 1650 */ 1651 ifra.ifra_lifetime.ia6t_vltime = pr->ndpr_vltime; 1652 ifra.ifra_lifetime.ia6t_pltime = pr->ndpr_pltime; 1653 1654 /* XXX: scope zone ID? */ 1655 1656 ifra.ifra_flags |= IN6_IFF_AUTOCONF; /* obey autoconf */ 1657 /* 1658 * temporarily set the nopfx flag to avoid conflict. 1659 * XXX: we should reconsider the entire mechanism about prefix 1660 * manipulation. 1661 */ 1662 ifra.ifra_flags |= IN6_IFF_NOPFX; 1663 1664 /* 1665 * keep the new address, regardless of the result of in6_update_ifa. 1666 * XXX: this address is now meaningless. 1667 * We should reconsider its role. 1668 */ 1669 pr->ndpr_addr = ifra.ifra_addr.sin6_addr; 1670 1671 /* allocate ifaddr structure, link into chain, etc. */ 1672 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) { 1673 nd6log((LOG_ERR, 1674 "in6_ifadd: failed to make ifaddr %s on %s (errno=%d)\n", 1675 ip6_sprintf(&ifra.ifra_addr.sin6_addr), if_name(ifp), 1676 error)); 1677 return (NULL); /* ifaddr must not have been allocated. */ 1678 } 1679 1680 ia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr); 1681 1682 return (ia); /* this must NOT be NULL. */ 1683 } 1684 1685 /* 1686 * Parameters: 1687 * ia0: corresponding public address 1688 */ 1689 int 1690 in6_tmpifadd(const struct in6_ifaddr *ia0, int forcegen) 1691 { 1692 struct ifnet *ifp = ia0->ia_ifa.ifa_ifp; 1693 struct in6_ifaddr *newia; 1694 struct in6_aliasreq ifra; 1695 int i, error; 1696 int trylimit = 3; /* XXX: adhoc value */ 1697 u_int32_t randid[2]; 1698 time_t vltime0, pltime0; 1699 1700 bzero(&ifra, sizeof(ifra)); 1701 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 1702 ifra.ifra_addr = ia0->ia_addr; 1703 /* copy prefix mask */ 1704 ifra.ifra_prefixmask = ia0->ia_prefixmask; 1705 /* clear the old IFID */ 1706 for (i = 0; i < 4; i++) { 1707 ifra.ifra_addr.sin6_addr.s6_addr32[i] 1708 &= ifra.ifra_prefixmask.sin6_addr.s6_addr32[i]; 1709 } 1710 1711 again: 1712 in6_get_tmpifid(ifp, (u_int8_t *)randid, 1713 (const u_int8_t *)&ia0->ia_addr.sin6_addr.s6_addr[8], 1714 forcegen); 1715 ifra.ifra_addr.sin6_addr.s6_addr32[2] 1716 |= (randid[0] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[2])); 1717 ifra.ifra_addr.sin6_addr.s6_addr32[3] 1718 |= (randid[1] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[3])); 1719 1720 /* 1721 * If by chance the new temporary address is the same as an address 1722 * already assigned to the interface, generate a new randomized 1723 * interface identifier and repeat this step. 1724 * RFC 3041 3.3 (4). 1725 */ 1726 if (in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr) != NULL) { 1727 if (trylimit-- == 0) { 1728 nd6log((LOG_NOTICE, "in6_tmpifadd: failed to find " 1729 "a unique random IFID\n")); 1730 return (EEXIST); 1731 } 1732 forcegen = 1; 1733 goto again; 1734 } 1735 1736 /* 1737 * The Valid Lifetime is the lower of the Valid Lifetime of the 1738 * public address or TEMP_VALID_LIFETIME. 1739 * The Preferred Lifetime is the lower of the Preferred Lifetime 1740 * of the public address or TEMP_PREFERRED_LIFETIME - 1741 * DESYNC_FACTOR. 1742 */ 1743 if (ia0->ia6_lifetime.ia6t_expire != 0) { 1744 vltime0 = IFA6_IS_INVALID(ia0) ? 0 : 1745 (ia0->ia6_lifetime.ia6t_expire - time_uptime); 1746 if (vltime0 > ip6_temp_valid_lifetime) 1747 vltime0 = ip6_temp_valid_lifetime; 1748 } else 1749 vltime0 = ip6_temp_valid_lifetime; 1750 if (ia0->ia6_lifetime.ia6t_preferred != 0) { 1751 pltime0 = IFA6_IS_DEPRECATED(ia0) ? 0 : 1752 (ia0->ia6_lifetime.ia6t_preferred - time_uptime); 1753 if (pltime0 > ip6_temp_preferred_lifetime - ip6_desync_factor) { 1754 pltime0 = ip6_temp_preferred_lifetime - 1755 ip6_desync_factor; 1756 } 1757 } else 1758 pltime0 = ip6_temp_preferred_lifetime - ip6_desync_factor; 1759 ifra.ifra_lifetime.ia6t_vltime = vltime0; 1760 ifra.ifra_lifetime.ia6t_pltime = pltime0; 1761 1762 /* 1763 * A temporary address is created only if this calculated Preferred 1764 * Lifetime is greater than REGEN_ADVANCE time units. 1765 */ 1766 if (ifra.ifra_lifetime.ia6t_pltime <= ip6_temp_regen_advance) 1767 return (0); 1768 1769 /* XXX: scope zone ID? */ 1770 1771 ifra.ifra_flags |= (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY); 1772 1773 /* allocate ifaddr structure, link into chain, etc. */ 1774 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) 1775 return (error); 1776 1777 newia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr); 1778 if (newia == NULL) { /* XXX: can it happen? */ 1779 nd6log((LOG_ERR, 1780 "in6_tmpifadd: ifa update succeeded, but we got " 1781 "no ifaddr\n")); 1782 return (EINVAL); /* XXX */ 1783 } 1784 newia->ia6_ndpr = ia0->ia6_ndpr; 1785 newia->ia6_ndpr->ndpr_refcnt++; 1786 1787 return (0); 1788 } 1789 1790 int 1791 in6_init_prefix_ltimes(struct nd_prefix *ndpr) 1792 { 1793 /* check if preferred lifetime > valid lifetime. RFC2462 5.5.3 (c) */ 1794 if (ndpr->ndpr_pltime > ndpr->ndpr_vltime) { 1795 nd6log((LOG_INFO, "in6_init_prefix_ltimes: preferred lifetime" 1796 "(%d) is greater than valid lifetime(%d)\n", 1797 (u_int)ndpr->ndpr_pltime, (u_int)ndpr->ndpr_vltime)); 1798 return (EINVAL); 1799 } 1800 if (ndpr->ndpr_pltime == ND6_INFINITE_LIFETIME) 1801 ndpr->ndpr_preferred = 0; 1802 else 1803 ndpr->ndpr_preferred = time_uptime + ndpr->ndpr_pltime; 1804 if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME) 1805 ndpr->ndpr_expire = 0; 1806 else 1807 ndpr->ndpr_expire = time_uptime + ndpr->ndpr_vltime; 1808 1809 return 0; 1810 } 1811 1812 static void 1813 in6_init_address_ltimes(struct nd_prefix *new, struct in6_addrlifetime *lt6) 1814 { 1815 /* init ia6t_expire */ 1816 if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME) 1817 lt6->ia6t_expire = 0; 1818 else { 1819 lt6->ia6t_expire = time_uptime; 1820 lt6->ia6t_expire += lt6->ia6t_vltime; 1821 } 1822 1823 /* init ia6t_preferred */ 1824 if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME) 1825 lt6->ia6t_preferred = 0; 1826 else { 1827 lt6->ia6t_preferred = time_uptime; 1828 lt6->ia6t_preferred += lt6->ia6t_pltime; 1829 } 1830 } 1831 1832 /* 1833 * Delete all the routing table entries that use the specified gateway. 1834 * 1835 * XXX: this function causes search through all entries of routing table, so 1836 * it shouldn't be called when acting as a router. 1837 */ 1838 void 1839 rt6_flush(struct in6_addr *gateway, struct ifnet *ifp) 1840 { 1841 struct radix_node_head *rnh = rt_tables[mycpuid][AF_INET6]; 1842 1843 /* We'll care only link-local addresses */ 1844 if (!IN6_IS_ADDR_LINKLOCAL(gateway)) 1845 return; 1846 /* XXX: hack for KAME's link-local address kludge */ 1847 gateway->s6_addr16[1] = htons(ifp->if_index); 1848 1849 rnh->rnh_walktree(rnh, rt6_deleteroute, (void *)gateway); 1850 } 1851 1852 static int 1853 rt6_deleteroute(struct radix_node *rn, void *arg) 1854 { 1855 #define SIN6(s) ((struct sockaddr_in6 *)s) 1856 struct rtentry *rt = (struct rtentry *)rn; 1857 struct in6_addr *gate = (struct in6_addr *)arg; 1858 1859 if (rt->rt_gateway == NULL || rt->rt_gateway->sa_family != AF_INET6) 1860 return (0); 1861 1862 if (!IN6_ARE_ADDR_EQUAL(gate, &SIN6(rt->rt_gateway)->sin6_addr)) 1863 return (0); 1864 1865 /* 1866 * Do not delete a static route. 1867 * XXX: this seems to be a bit ad-hoc. Should we consider the 1868 * 'cloned' bit instead? 1869 */ 1870 if (rt->rt_flags & RTF_STATIC) 1871 return (0); 1872 1873 /* 1874 * We delete only host route. This means, in particular, we don't 1875 * delete default route. 1876 */ 1877 if (!(rt->rt_flags & RTF_HOST)) 1878 return (0); 1879 1880 return (rtrequest(RTM_DELETE, rt_key(rt), 1881 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0)); 1882 #undef SIN6 1883 } 1884 1885 int 1886 nd6_setdefaultiface(int ifindex) 1887 { 1888 int error = 0; 1889 1890 if (ifindex < 0 || if_index < ifindex) 1891 return (EINVAL); 1892 1893 if (nd6_defifindex != ifindex) { 1894 nd6_defifindex = ifindex; 1895 if (nd6_defifindex > 0) 1896 nd6_defifp = ifindex2ifnet[nd6_defifindex]; 1897 else 1898 nd6_defifp = NULL; 1899 1900 /* 1901 * If the Default Router List is empty, install a route 1902 * to the specified interface as default or remove the default 1903 * route when the default interface becomes canceled. 1904 * The check for the queue is actually redundant, but 1905 * we do this here to avoid re-install the default route 1906 * if the list is NOT empty. 1907 */ 1908 if (TAILQ_FIRST(&nd_defrouter) == NULL) 1909 defrouter_select(); 1910 1911 /* 1912 * Our current implementation assumes one-to-one maping between 1913 * interfaces and links, so it would be natural to use the 1914 * default interface as the default link. 1915 */ 1916 scope6_setdefault(nd6_defifp); 1917 } 1918 1919 return (error); 1920 } 1921