1 /* $FreeBSD: src/sys/netinet6/nd6_rtr.c,v 1.2.2.5 2003/04/05 10:28:53 ume Exp $ */ 2 /* $DragonFly: src/sys/netinet6/nd6_rtr.c,v 1.17 2008/03/07 11:34:21 sephe Exp $ */ 3 /* $KAME: nd6_rtr.c,v 1.111 2001/04/27 01:37:15 jinmei Exp $ */ 4 5 /* 6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the project nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include "opt_inet.h" 35 #include "opt_inet6.h" 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/malloc.h> 40 #include <sys/mbuf.h> 41 #include <sys/socket.h> 42 #include <sys/sockio.h> 43 #include <sys/time.h> 44 #include <sys/kernel.h> 45 #include <sys/errno.h> 46 #include <sys/syslog.h> 47 #include <sys/queue.h> 48 #include <sys/globaldata.h> 49 #include <sys/mutex.h> 50 51 #include <sys/thread2.h> 52 #include <sys/mutex2.h> 53 54 #include <net/if.h> 55 #include <net/if_types.h> 56 #include <net/if_dl.h> 57 #include <net/route.h> 58 #include <net/radix.h> 59 60 #include <netinet/in.h> 61 #include <netinet6/in6_var.h> 62 #include <netinet6/in6_ifattach.h> 63 #include <netinet/ip6.h> 64 #include <netinet6/ip6_var.h> 65 #include <netinet6/nd6.h> 66 #include <netinet/icmp6.h> 67 #include <netinet6/scope6_var.h> 68 69 #include <net/net_osdep.h> 70 71 #define SDL(s) ((struct sockaddr_dl *)s) 72 73 static struct nd_defrouter *defrtrlist_update (struct nd_defrouter *); 74 static struct in6_ifaddr *in6_ifadd (struct nd_prefix *, 75 struct in6_addr *); 76 static struct nd_pfxrouter *pfxrtr_lookup (struct nd_prefix *, 77 struct nd_defrouter *); 78 static void pfxrtr_add (struct nd_prefix *, struct nd_defrouter *); 79 static void pfxrtr_del (struct nd_pfxrouter *); 80 static struct nd_pfxrouter *find_pfxlist_reachable_router 81 (struct nd_prefix *); 82 static void defrouter_addifreq (struct ifnet *); 83 84 static void in6_init_address_ltimes (struct nd_prefix *ndpr, 85 struct in6_addrlifetime *lt6); 86 87 static int rt6_deleteroute (struct radix_node *, void *); 88 89 extern int nd6_recalc_reachtm_interval; 90 91 static struct ifnet *nd6_defifp; 92 int nd6_defifindex; 93 94 int ip6_use_tempaddr = 0; 95 96 int ip6_desync_factor; 97 u_int32_t ip6_temp_preferred_lifetime = DEF_TEMP_PREFERRED_LIFETIME; 98 u_int32_t ip6_temp_valid_lifetime = DEF_TEMP_VALID_LIFETIME; 99 /* 100 * shorter lifetimes for debugging purposes. 101 int ip6_temp_preferred_lifetime = 800; 102 static int ip6_temp_valid_lifetime = 1800; 103 */ 104 int ip6_temp_regen_advance = TEMPADDR_REGEN_ADVANCE; 105 106 /* 107 * Receive Router Solicitation Message - just for routers. 108 * Router solicitation/advertisement is mostly managed by userland program 109 * (rtadvd) so here we have no function like nd6_ra_output(). 110 * 111 * Based on RFC 2461 112 */ 113 void 114 nd6_rs_input(struct mbuf *m, int off, int icmp6len) 115 { 116 struct ifnet *ifp = m->m_pkthdr.rcvif; 117 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 118 struct nd_router_solicit *nd_rs; 119 struct in6_addr saddr6 = ip6->ip6_src; 120 #if 0 121 struct in6_addr daddr6 = ip6->ip6_dst; 122 #endif 123 char *lladdr = NULL; 124 int lladdrlen = 0; 125 #if 0 126 struct sockaddr_dl *sdl = NULL; 127 struct llinfo_nd6 *ln = NULL; 128 struct rtentry *rt = NULL; 129 int is_newentry; 130 #endif 131 union nd_opts ndopts; 132 133 /* If I'm not a router, ignore it. */ 134 if (ip6_accept_rtadv != 0 || ip6_forwarding != 1) 135 goto freeit; 136 137 /* Sanity checks */ 138 if (ip6->ip6_hlim != 255) { 139 nd6log((LOG_ERR, 140 "nd6_rs_input: invalid hlim (%d) from %s to %s on %s\n", 141 ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src), 142 ip6_sprintf(&ip6->ip6_dst), if_name(ifp))); 143 goto bad; 144 } 145 146 /* 147 * Don't update the neighbor cache, if src = ::. 148 * This indicates that the src has no IP address assigned yet. 149 */ 150 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) 151 goto freeit; 152 153 #ifndef PULLDOWN_TEST 154 IP6_EXTHDR_CHECK(m, off, icmp6len,); 155 nd_rs = (struct nd_router_solicit *)((caddr_t)ip6 + off); 156 #else 157 IP6_EXTHDR_GET(nd_rs, struct nd_router_solicit *, m, off, icmp6len); 158 if (nd_rs == NULL) { 159 icmp6stat.icp6s_tooshort++; 160 return; 161 } 162 #endif 163 164 icmp6len -= sizeof(*nd_rs); 165 nd6_option_init(nd_rs + 1, icmp6len, &ndopts); 166 if (nd6_options(&ndopts) < 0) { 167 nd6log((LOG_INFO, 168 "nd6_rs_input: invalid ND option, ignored\n")); 169 /* nd6_options have incremented stats */ 170 goto freeit; 171 } 172 173 if (ndopts.nd_opts_src_lladdr) { 174 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1); 175 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3; 176 } 177 178 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 179 nd6log((LOG_INFO, 180 "nd6_rs_input: lladdrlen mismatch for %s " 181 "(if %d, RS packet %d)\n", 182 ip6_sprintf(&saddr6), ifp->if_addrlen, lladdrlen - 2)); 183 goto bad; 184 } 185 186 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_SOLICIT, 0); 187 188 freeit: 189 m_freem(m); 190 return; 191 192 bad: 193 icmp6stat.icp6s_badrs++; 194 m_freem(m); 195 } 196 197 /* 198 * Receive Router Advertisement Message. 199 * 200 * Based on RFC 2461 201 * TODO: on-link bit on prefix information 202 * TODO: ND_RA_FLAG_{OTHER,MANAGED} processing 203 */ 204 void 205 nd6_ra_input(struct mbuf *m, int off, int icmp6len) 206 { 207 struct ifnet *ifp = m->m_pkthdr.rcvif; 208 struct nd_ifinfo *ndi = ND_IFINFO(ifp); 209 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 210 struct nd_router_advert *nd_ra; 211 struct in6_addr saddr6 = ip6->ip6_src; 212 #if 0 213 struct in6_addr daddr6 = ip6->ip6_dst; 214 int flags; /* = nd_ra->nd_ra_flags_reserved; */ 215 int is_managed = ((flags & ND_RA_FLAG_MANAGED) != 0); 216 int is_other = ((flags & ND_RA_FLAG_OTHER) != 0); 217 #endif 218 union nd_opts ndopts; 219 struct nd_defrouter *dr; 220 221 /* 222 * We only accept RAs only when 223 * the system-wide variable allows the acceptance, and 224 * per-interface variable allows RAs on the receiving interface. 225 */ 226 if (ip6_accept_rtadv == 0) 227 goto freeit; 228 if (!(ndi->flags & ND6_IFF_ACCEPT_RTADV)) 229 goto freeit; 230 231 if (ip6->ip6_hlim != 255) { 232 nd6log((LOG_ERR, 233 "nd6_ra_input: invalid hlim (%d) from %s to %s on %s\n", 234 ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src), 235 ip6_sprintf(&ip6->ip6_dst), if_name(ifp))); 236 goto bad; 237 } 238 239 if (!IN6_IS_ADDR_LINKLOCAL(&saddr6)) { 240 nd6log((LOG_ERR, 241 "nd6_ra_input: src %s is not link-local\n", 242 ip6_sprintf(&saddr6))); 243 goto bad; 244 } 245 246 #ifndef PULLDOWN_TEST 247 IP6_EXTHDR_CHECK(m, off, icmp6len,); 248 nd_ra = (struct nd_router_advert *)((caddr_t)ip6 + off); 249 #else 250 IP6_EXTHDR_GET(nd_ra, struct nd_router_advert *, m, off, icmp6len); 251 if (nd_ra == NULL) { 252 icmp6stat.icp6s_tooshort++; 253 return; 254 } 255 #endif 256 257 icmp6len -= sizeof(*nd_ra); 258 nd6_option_init(nd_ra + 1, icmp6len, &ndopts); 259 if (nd6_options(&ndopts) < 0) { 260 nd6log((LOG_INFO, 261 "nd6_ra_input: invalid ND option, ignored\n")); 262 /* nd6_options have incremented stats */ 263 goto freeit; 264 } 265 266 { 267 struct nd_defrouter dr0; 268 u_int32_t advreachable = nd_ra->nd_ra_reachable; 269 270 dr0.rtaddr = saddr6; 271 dr0.flags = nd_ra->nd_ra_flags_reserved; 272 dr0.rtlifetime = ntohs(nd_ra->nd_ra_router_lifetime); 273 dr0.expire = time_second + dr0.rtlifetime; 274 dr0.ifp = ifp; 275 dr0.advint = 0; /* Mobile IPv6 */ 276 dr0.advint_expire = 0; /* Mobile IPv6 */ 277 dr0.advints_lost = 0; /* Mobile IPv6 */ 278 /* unspecified or not? (RFC 2461 6.3.4) */ 279 if (advreachable) { 280 advreachable = ntohl(advreachable); 281 if (advreachable <= MAX_REACHABLE_TIME && 282 ndi->basereachable != advreachable) { 283 ndi->basereachable = advreachable; 284 ndi->reachable = ND_COMPUTE_RTIME(ndi->basereachable); 285 ndi->recalctm = nd6_recalc_reachtm_interval; /* reset */ 286 } 287 } 288 if (nd_ra->nd_ra_retransmit) 289 ndi->retrans = ntohl(nd_ra->nd_ra_retransmit); 290 if (nd_ra->nd_ra_curhoplimit) 291 ndi->chlim = nd_ra->nd_ra_curhoplimit; 292 dr = defrtrlist_update(&dr0); 293 } 294 295 /* 296 * prefix 297 */ 298 if (ndopts.nd_opts_pi) { 299 struct nd_opt_hdr *pt; 300 struct nd_opt_prefix_info *pi = NULL; 301 struct nd_prefix pr; 302 303 for (pt = (struct nd_opt_hdr *)ndopts.nd_opts_pi; 304 pt <= (struct nd_opt_hdr *)ndopts.nd_opts_pi_end; 305 pt = (struct nd_opt_hdr *)((caddr_t)pt + 306 (pt->nd_opt_len << 3))) { 307 if (pt->nd_opt_type != ND_OPT_PREFIX_INFORMATION) 308 continue; 309 pi = (struct nd_opt_prefix_info *)pt; 310 311 if (pi->nd_opt_pi_len != 4) { 312 nd6log((LOG_INFO, 313 "nd6_ra_input: invalid option " 314 "len %d for prefix information option, " 315 "ignored\n", pi->nd_opt_pi_len)); 316 continue; 317 } 318 319 if (128 < pi->nd_opt_pi_prefix_len) { 320 nd6log((LOG_INFO, 321 "nd6_ra_input: invalid prefix " 322 "len %d for prefix information option, " 323 "ignored\n", pi->nd_opt_pi_prefix_len)); 324 continue; 325 } 326 327 if (IN6_IS_ADDR_MULTICAST(&pi->nd_opt_pi_prefix) 328 || IN6_IS_ADDR_LINKLOCAL(&pi->nd_opt_pi_prefix)) { 329 nd6log((LOG_INFO, 330 "nd6_ra_input: invalid prefix " 331 "%s, ignored\n", 332 ip6_sprintf(&pi->nd_opt_pi_prefix))); 333 continue; 334 } 335 336 /* aggregatable unicast address, rfc2374 */ 337 if ((pi->nd_opt_pi_prefix.s6_addr8[0] & 0xe0) == 0x20 338 && pi->nd_opt_pi_prefix_len != 64) { 339 nd6log((LOG_INFO, 340 "nd6_ra_input: invalid prefixlen " 341 "%d for rfc2374 prefix %s, ignored\n", 342 pi->nd_opt_pi_prefix_len, 343 ip6_sprintf(&pi->nd_opt_pi_prefix))); 344 continue; 345 } 346 347 bzero(&pr, sizeof(pr)); 348 pr.ndpr_prefix.sin6_family = AF_INET6; 349 pr.ndpr_prefix.sin6_len = sizeof(pr.ndpr_prefix); 350 pr.ndpr_prefix.sin6_addr = pi->nd_opt_pi_prefix; 351 pr.ndpr_ifp = (struct ifnet *)m->m_pkthdr.rcvif; 352 353 pr.ndpr_raf_onlink = (pi->nd_opt_pi_flags_reserved & 354 ND_OPT_PI_FLAG_ONLINK) ? 1 : 0; 355 pr.ndpr_raf_auto = (pi->nd_opt_pi_flags_reserved & 356 ND_OPT_PI_FLAG_AUTO) ? 1 : 0; 357 pr.ndpr_plen = pi->nd_opt_pi_prefix_len; 358 pr.ndpr_vltime = ntohl(pi->nd_opt_pi_valid_time); 359 pr.ndpr_pltime = 360 ntohl(pi->nd_opt_pi_preferred_time); 361 362 if (in6_init_prefix_ltimes(&pr)) 363 continue; /* prefix lifetime init failed */ 364 365 prelist_update(&pr, dr, m); 366 } 367 } 368 369 /* 370 * MTU 371 */ 372 if (ndopts.nd_opts_mtu && ndopts.nd_opts_mtu->nd_opt_mtu_len == 1) { 373 u_int32_t mtu = ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu); 374 375 /* lower bound */ 376 if (mtu < IPV6_MMTU) { 377 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu option " 378 "mtu=%d sent from %s, ignoring\n", 379 mtu, ip6_sprintf(&ip6->ip6_src))); 380 goto skip; 381 } 382 383 /* upper bound */ 384 if (ndi->maxmtu) { 385 if (mtu <= ndi->maxmtu) { 386 int change = (ndi->linkmtu != mtu); 387 388 ndi->linkmtu = mtu; 389 if (change) /* in6_maxmtu may change */ 390 in6_setmaxmtu(); 391 } else { 392 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu " 393 "mtu=%d sent from %s; " 394 "exceeds maxmtu %d, ignoring\n", 395 mtu, ip6_sprintf(&ip6->ip6_src), 396 ndi->maxmtu)); 397 } 398 } else { 399 nd6log((LOG_INFO, "nd6_ra_input: mtu option " 400 "mtu=%d sent from %s; maxmtu unknown, " 401 "ignoring\n", 402 mtu, ip6_sprintf(&ip6->ip6_src))); 403 } 404 } 405 406 skip: 407 408 /* 409 * Source link layer address 410 */ 411 { 412 char *lladdr = NULL; 413 int lladdrlen = 0; 414 415 if (ndopts.nd_opts_src_lladdr) { 416 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1); 417 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3; 418 } 419 420 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 421 nd6log((LOG_INFO, 422 "nd6_ra_input: lladdrlen mismatch for %s " 423 "(if %d, RA packet %d)\n", 424 ip6_sprintf(&saddr6), ifp->if_addrlen, lladdrlen - 2)); 425 goto bad; 426 } 427 428 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_ADVERT, 0); 429 430 /* 431 * Installing a link-layer address might change the state of the 432 * router's neighbor cache, which might also affect our on-link 433 * detection of adveritsed prefixes. 434 */ 435 pfxlist_onlink_check(); 436 } 437 438 freeit: 439 m_freem(m); 440 return; 441 442 bad: 443 icmp6stat.icp6s_badra++; 444 m_freem(m); 445 } 446 447 /* 448 * default router list proccessing sub routines 449 */ 450 451 #if 0 452 /* tell the change to user processes watching the routing socket. */ 453 static void 454 nd6_rtmsg(int cmd, struct rtentry *rt) 455 { 456 struct rt_addrinfo info; 457 458 bzero((caddr_t)&info, sizeof(info)); 459 info.rti_info[RTAX_DST] = rt_key(rt); 460 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 461 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 462 if (TAILQ_EMPTY(&rt->rt_ifp->if_addrheads[mycpuid])) { 463 info.rti_info[RTAX_IFP] = NULL; 464 } else { 465 info.rti_info[RTAX_IFP] = 466 (struct sockaddr *) 467 TAILQ_FIRST(&rt->rt_ifp->if_addrheads[mycpuid])->ifa; 468 } 469 info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr; 470 471 rt_missmsg(cmd, &info, rt->rt_flags, 0); 472 } 473 #endif 474 475 void 476 defrouter_addreq(struct nd_defrouter *new) 477 { 478 struct sockaddr_in6 def, mask, gate; 479 480 bzero(&def, sizeof(def)); 481 bzero(&mask, sizeof(mask)); 482 bzero(&gate, sizeof(gate)); 483 484 def.sin6_len = mask.sin6_len = gate.sin6_len 485 = sizeof(struct sockaddr_in6); 486 def.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6; 487 gate.sin6_addr = new->rtaddr; 488 489 rtrequest_global(RTM_ADD, (struct sockaddr *)&def, 490 (struct sockaddr *)&gate, (struct sockaddr *)&mask, 491 RTF_GATEWAY); 492 return; 493 } 494 495 /* Add a route to a given interface as default */ 496 void 497 defrouter_addifreq(struct ifnet *ifp) 498 { 499 struct sockaddr_in6 def, mask; 500 struct ifaddr *ifa; 501 int error, flags; 502 503 bzero(&def, sizeof(def)); 504 bzero(&mask, sizeof(mask)); 505 506 def.sin6_len = mask.sin6_len = sizeof(struct sockaddr_in6); 507 def.sin6_family = mask.sin6_family = AF_INET6; 508 509 /* 510 * Search for an ifaddr beloging to the specified interface. 511 * XXX: An IPv6 address are required to be assigned on the interface. 512 */ 513 if ((ifa = ifaof_ifpforaddr((struct sockaddr *)&def, ifp)) == NULL) { 514 nd6log((LOG_ERR, /* better error? */ 515 "defrouter_addifreq: failed to find an ifaddr " 516 "to install a route to interface %s\n", 517 if_name(ifp))); 518 return; 519 } 520 521 flags = ifa->ifa_flags; 522 error = rtrequest_global(RTM_ADD, 523 (struct sockaddr *)&def, 524 ifa->ifa_addr, 525 (struct sockaddr *)&mask, 526 flags); 527 if (error != 0) { 528 nd6log((LOG_ERR, 529 "defrouter_addifreq: failed to install a route to " 530 "interface %s (errno = %d)\n", 531 if_name(ifp), error)); 532 } 533 } 534 535 struct nd_defrouter * 536 defrouter_lookup(struct in6_addr *addr, struct ifnet *ifp) 537 { 538 struct nd_defrouter *dr; 539 540 for (dr = TAILQ_FIRST(&nd_defrouter); dr; 541 dr = TAILQ_NEXT(dr, dr_entry)) { 542 if (dr->ifp == ifp && IN6_ARE_ADDR_EQUAL(addr, &dr->rtaddr)) 543 return (dr); 544 } 545 546 return (NULL); /* search failed */ 547 } 548 549 void 550 defrouter_delreq(struct nd_defrouter *dr, int dofree) 551 { 552 struct sockaddr_in6 def, mask, gate; 553 554 bzero(&def, sizeof(def)); 555 bzero(&mask, sizeof(mask)); 556 bzero(&gate, sizeof(gate)); 557 558 def.sin6_len = mask.sin6_len = gate.sin6_len 559 = sizeof(struct sockaddr_in6); 560 def.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6; 561 gate.sin6_addr = dr->rtaddr; 562 563 rtrequest_global(RTM_DELETE, 564 (struct sockaddr *)&def, 565 (struct sockaddr *)&gate, 566 (struct sockaddr *)&mask, 567 RTF_GATEWAY); 568 if (dofree) /* XXX: necessary? */ 569 kfree(dr, M_IP6NDP); 570 } 571 572 void 573 defrtrlist_del(struct nd_defrouter *dr) 574 { 575 struct nd_defrouter *deldr = NULL; 576 struct nd_prefix *pr; 577 578 /* 579 * Flush all the routing table entries that use the router 580 * as a next hop. 581 */ 582 if (!ip6_forwarding && ip6_accept_rtadv) { 583 /* above is a good condition? */ 584 rt6_flush(&dr->rtaddr, dr->ifp); 585 } 586 587 if (dr == TAILQ_FIRST(&nd_defrouter)) 588 deldr = dr; /* The router is primary. */ 589 590 TAILQ_REMOVE(&nd_defrouter, dr, dr_entry); 591 592 /* 593 * Also delete all the pointers to the router in each prefix lists. 594 */ 595 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 596 struct nd_pfxrouter *pfxrtr; 597 if ((pfxrtr = pfxrtr_lookup(pr, dr)) != NULL) 598 pfxrtr_del(pfxrtr); 599 } 600 pfxlist_onlink_check(); 601 602 /* 603 * If the router is the primary one, choose a new one. 604 * Note that defrouter_select() will remove the current gateway 605 * from the routing table. 606 */ 607 if (deldr) 608 defrouter_select(); 609 610 kfree(dr, M_IP6NDP); 611 } 612 613 /* 614 * Default Router Selection according to Section 6.3.6 of RFC 2461: 615 * 1) Routers that are reachable or probably reachable should be 616 * preferred. 617 * 2) When no routers on the list are known to be reachable or 618 * probably reachable, routers SHOULD be selected in a round-robin 619 * fashion. 620 * 3) If the Default Router List is empty, assume that all 621 * destinations are on-link. 622 */ 623 void 624 defrouter_select(void) 625 { 626 struct nd_defrouter *dr, anydr; 627 struct rtentry *rt = NULL; 628 struct llinfo_nd6 *ln = NULL; 629 630 mtx_lock(&nd6_mtx); 631 632 /* 633 * Search for a (probably) reachable router from the list. 634 */ 635 for (dr = TAILQ_FIRST(&nd_defrouter); dr; 636 dr = TAILQ_NEXT(dr, dr_entry)) { 637 if ((rt = nd6_lookup(&dr->rtaddr, 0, dr->ifp)) && 638 (ln = (struct llinfo_nd6 *)rt->rt_llinfo) && 639 ND6_IS_LLINFO_PROBREACH(ln)) { 640 /* Got it, and move it to the head */ 641 TAILQ_REMOVE(&nd_defrouter, dr, dr_entry); 642 TAILQ_INSERT_HEAD(&nd_defrouter, dr, dr_entry); 643 break; 644 } 645 } 646 647 if ((dr = TAILQ_FIRST(&nd_defrouter))) { 648 /* 649 * De-install the previous default gateway and install 650 * a new one. 651 * Note that if there is no reachable router in the list, 652 * the head entry will be used anyway. 653 * XXX: do we have to check the current routing table entry? 654 */ 655 bzero(&anydr, sizeof(anydr)); 656 defrouter_delreq(&anydr, 0); 657 defrouter_addreq(dr); 658 } 659 else { 660 /* 661 * The Default Router List is empty, so install the default 662 * route to an inteface. 663 * XXX: The specification does not say this mechanism should 664 * be restricted to hosts, but this would be not useful 665 * (even harmful) for routers. 666 */ 667 if (!ip6_forwarding) { 668 /* 669 * De-install the current default route 670 * in advance. 671 */ 672 bzero(&anydr, sizeof(anydr)); 673 defrouter_delreq(&anydr, 0); 674 if (nd6_defifp) { 675 /* 676 * Install a route to the default interface 677 * as default route. 678 * XXX: we enable this for host only, because 679 * this may override a default route installed 680 * a user process (e.g. routing daemon) in a 681 * router case. 682 */ 683 defrouter_addifreq(nd6_defifp); 684 } else { 685 nd6log((LOG_INFO, "defrouter_select: " 686 "there's no default router and no default" 687 " interface\n")); 688 } 689 } 690 } 691 mtx_unlock(&nd6_mtx); 692 return; 693 } 694 695 static struct nd_defrouter * 696 defrtrlist_update(struct nd_defrouter *new) 697 { 698 struct nd_defrouter *dr, *n; 699 700 mtx_lock(&nd6_mtx); 701 702 if ((dr = defrouter_lookup(&new->rtaddr, new->ifp)) != NULL) { 703 /* entry exists */ 704 if (new->rtlifetime == 0) { 705 defrtrlist_del(dr); 706 dr = NULL; 707 } else { 708 /* override */ 709 dr->flags = new->flags; /* xxx flag check */ 710 dr->rtlifetime = new->rtlifetime; 711 dr->expire = new->expire; 712 } 713 mtx_unlock(&nd6_mtx); 714 return (dr); 715 } 716 717 /* entry does not exist */ 718 if (new->rtlifetime == 0) { 719 mtx_unlock(&nd6_mtx); 720 return (NULL); 721 } 722 723 n = (struct nd_defrouter *)kmalloc(sizeof(*n), M_IP6NDP, 724 M_NOWAIT | M_ZERO); 725 if (n == NULL) { 726 mtx_unlock(&nd6_mtx); 727 return (NULL); 728 } 729 *n = *new; 730 731 /* 732 * Insert the new router at the end of the Default Router List. 733 * If there is no other router, install it anyway. Otherwise, 734 * just continue to use the current default router. 735 */ 736 TAILQ_INSERT_TAIL(&nd_defrouter, n, dr_entry); 737 if (TAILQ_FIRST(&nd_defrouter) == n) 738 defrouter_select(); 739 mtx_unlock(&nd6_mtx); 740 return (n); 741 } 742 743 static struct nd_pfxrouter * 744 pfxrtr_lookup(struct nd_prefix *pr, struct nd_defrouter *dr) 745 { 746 struct nd_pfxrouter *search; 747 748 for (search = pr->ndpr_advrtrs.lh_first; search; search = search->pfr_next) { 749 if (search->router == dr) 750 break; 751 } 752 753 return (search); 754 } 755 756 static void 757 pfxrtr_add(struct nd_prefix *pr, struct nd_defrouter *dr) 758 { 759 struct nd_pfxrouter *new; 760 761 new = (struct nd_pfxrouter *)kmalloc(sizeof(*new), M_IP6NDP, 762 M_NOWAIT | M_ZERO); 763 if (new == NULL) 764 return; 765 new->router = dr; 766 767 LIST_INSERT_HEAD(&pr->ndpr_advrtrs, new, pfr_entry); 768 769 pfxlist_onlink_check(); 770 } 771 772 static void 773 pfxrtr_del(struct nd_pfxrouter *pfr) 774 { 775 LIST_REMOVE(pfr, pfr_entry); 776 kfree(pfr, M_IP6NDP); 777 } 778 779 struct nd_prefix * 780 nd6_prefix_lookup(struct nd_prefix *pr) 781 { 782 struct nd_prefix *search; 783 784 for (search = nd_prefix.lh_first; search; search = search->ndpr_next) { 785 if (pr->ndpr_ifp == search->ndpr_ifp && 786 pr->ndpr_plen == search->ndpr_plen && 787 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr, 788 &search->ndpr_prefix.sin6_addr, 789 pr->ndpr_plen) 790 ) { 791 break; 792 } 793 } 794 795 return (search); 796 } 797 798 int 799 nd6_prelist_add(struct nd_prefix *pr, struct nd_defrouter *dr, 800 struct nd_prefix **newp) 801 { 802 struct nd_prefix *new = NULL; 803 int i; 804 805 new = (struct nd_prefix *)kmalloc(sizeof(*new), M_IP6NDP, 806 M_NOWAIT | M_ZERO); 807 if (new == NULL) 808 return ENOMEM; 809 *new = *pr; 810 if (newp != NULL) 811 *newp = new; 812 813 /* initilization */ 814 LIST_INIT(&new->ndpr_advrtrs); 815 in6_prefixlen2mask(&new->ndpr_mask, new->ndpr_plen); 816 /* make prefix in the canonical form */ 817 for (i = 0; i < 4; i++) 818 new->ndpr_prefix.sin6_addr.s6_addr32[i] &= 819 new->ndpr_mask.s6_addr32[i]; 820 821 mtx_lock(&nd6_mtx); 822 /* link ndpr_entry to nd_prefix list */ 823 LIST_INSERT_HEAD(&nd_prefix, new, ndpr_entry); 824 mtx_unlock(&nd6_mtx); 825 826 /* ND_OPT_PI_FLAG_ONLINK processing */ 827 if (new->ndpr_raf_onlink) { 828 int e; 829 830 if ((e = nd6_prefix_onlink(new)) != 0) { 831 nd6log((LOG_ERR, "nd6_prelist_add: failed to make " 832 "the prefix %s/%d on-link on %s (errno=%d)\n", 833 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 834 pr->ndpr_plen, if_name(pr->ndpr_ifp), e)); 835 /* proceed anyway. XXX: is it correct? */ 836 } 837 } 838 839 if (dr) { 840 pfxrtr_add(new, dr); 841 } 842 843 return 0; 844 } 845 846 void 847 prelist_remove(struct nd_prefix *pr) 848 { 849 struct nd_pfxrouter *pfr, *next; 850 int e; 851 852 /* make sure to invalidate the prefix until it is really freed. */ 853 pr->ndpr_vltime = 0; 854 pr->ndpr_pltime = 0; 855 #if 0 856 /* 857 * Though these flags are now meaningless, we'd rather keep the value 858 * not to confuse users when executing "ndp -p". 859 */ 860 pr->ndpr_raf_onlink = 0; 861 pr->ndpr_raf_auto = 0; 862 #endif 863 if ((pr->ndpr_stateflags & NDPRF_ONLINK) && 864 (e = nd6_prefix_offlink(pr)) != 0) { 865 nd6log((LOG_ERR, "prelist_remove: failed to make %s/%d offlink " 866 "on %s, errno=%d\n", 867 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 868 pr->ndpr_plen, if_name(pr->ndpr_ifp), e)); 869 /* what should we do? */ 870 } 871 872 if (pr->ndpr_refcnt > 0) 873 return; /* notice here? */ 874 875 mtx_lock(&nd6_mtx); 876 877 /* unlink ndpr_entry from nd_prefix list */ 878 LIST_REMOVE(pr, ndpr_entry); 879 880 /* free list of routers that adversed the prefix */ 881 for (pfr = pr->ndpr_advrtrs.lh_first; pfr; pfr = next) { 882 next = pfr->pfr_next; 883 884 kfree(pfr, M_IP6NDP); 885 } 886 mtx_unlock(&nd6_mtx); 887 888 kfree(pr, M_IP6NDP); 889 890 pfxlist_onlink_check(); 891 } 892 893 /* 894 * Parameters: 895 * dr: may be NULL 896 */ 897 int 898 prelist_update(struct nd_prefix *new, struct nd_defrouter *dr, struct mbuf *m) 899 { 900 struct in6_ifaddr *ia6 = NULL, *ia6_match = NULL; 901 struct ifaddr_container *ifac; 902 struct ifnet *ifp = new->ndpr_ifp; 903 struct nd_prefix *pr; 904 int error = 0; 905 int newprefix = 0; 906 int auth; 907 struct in6_addrlifetime lt6_tmp; 908 909 auth = 0; 910 mtx_lock(&nd6_mtx); 911 if (m) { 912 /* 913 * Authenticity for NA consists authentication for 914 * both IP header and IP datagrams, doesn't it ? 915 */ 916 #if defined(M_AUTHIPHDR) && defined(M_AUTHIPDGM) 917 auth = (m->m_flags & M_AUTHIPHDR 918 && m->m_flags & M_AUTHIPDGM) ? 1 : 0; 919 #endif 920 } 921 922 923 if ((pr = nd6_prefix_lookup(new)) != NULL) { 924 /* 925 * nd6_prefix_lookup() ensures that pr and new have the same 926 * prefix on a same interface. 927 */ 928 929 /* 930 * Update prefix information. Note that the on-link (L) bit 931 * and the autonomous (A) bit should NOT be changed from 1 932 * to 0. 933 */ 934 if (new->ndpr_raf_onlink == 1) 935 pr->ndpr_raf_onlink = 1; 936 if (new->ndpr_raf_auto == 1) 937 pr->ndpr_raf_auto = 1; 938 if (new->ndpr_raf_onlink) { 939 pr->ndpr_vltime = new->ndpr_vltime; 940 pr->ndpr_pltime = new->ndpr_pltime; 941 pr->ndpr_preferred = new->ndpr_preferred; 942 pr->ndpr_expire = new->ndpr_expire; 943 } 944 945 if (new->ndpr_raf_onlink && 946 !(pr->ndpr_stateflags & NDPRF_ONLINK)) { 947 int e; 948 949 if ((e = nd6_prefix_onlink(pr)) != 0) { 950 nd6log((LOG_ERR, 951 "prelist_update: failed to make " 952 "the prefix %s/%d on-link on %s " 953 "(errno=%d)\n", 954 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 955 pr->ndpr_plen, if_name(pr->ndpr_ifp), e)); 956 /* proceed anyway. XXX: is it correct? */ 957 } 958 } 959 960 if (dr && pfxrtr_lookup(pr, dr) == NULL) 961 pfxrtr_add(pr, dr); 962 } else { 963 struct nd_prefix *newpr = NULL; 964 965 newprefix = 1; 966 967 if (new->ndpr_vltime == 0) 968 goto end; 969 if (new->ndpr_raf_onlink == 0 && new->ndpr_raf_auto == 0) 970 goto end; 971 972 bzero(&new->ndpr_addr, sizeof(struct in6_addr)); 973 974 error = nd6_prelist_add(new, dr, &newpr); 975 if (error != 0 || newpr == NULL) { 976 nd6log((LOG_NOTICE, "prelist_update: " 977 "nd6_prelist_add failed for %s/%d on %s " 978 "errno=%d, returnpr=%p\n", 979 ip6_sprintf(&new->ndpr_prefix.sin6_addr), 980 new->ndpr_plen, if_name(new->ndpr_ifp), 981 error, newpr)); 982 goto end; /* we should just give up in this case. */ 983 } 984 985 /* 986 * XXX: from the ND point of view, we can ignore a prefix 987 * with the on-link bit being zero. However, we need a 988 * prefix structure for references from autoconfigured 989 * addresses. Thus, we explicitly make suret that the prefix 990 * itself expires now. 991 */ 992 if (newpr->ndpr_raf_onlink == 0) { 993 newpr->ndpr_vltime = 0; 994 newpr->ndpr_pltime = 0; 995 in6_init_prefix_ltimes(newpr); 996 } 997 998 pr = newpr; 999 } 1000 1001 /* 1002 * Address autoconfiguration based on Section 5.5.3 of RFC 2462. 1003 * Note that pr must be non NULL at this point. 1004 */ 1005 1006 /* 5.5.3 (a). Ignore the prefix without the A bit set. */ 1007 if (!new->ndpr_raf_auto) 1008 goto afteraddrconf; 1009 1010 /* 1011 * 5.5.3 (b). the link-local prefix should have been ignored in 1012 * nd6_ra_input. 1013 */ 1014 1015 /* 1016 * 5.5.3 (c). Consistency check on lifetimes: pltime <= vltime. 1017 * This should have been done in nd6_ra_input. 1018 */ 1019 1020 /* 1021 * 5.5.3 (d). If the prefix advertised does not match the prefix of an 1022 * address already in the list, and the Valid Lifetime is not 0, 1023 * form an address. Note that even a manually configured address 1024 * should reject autoconfiguration of a new address. 1025 */ 1026 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1027 struct ifaddr *ifa = ifac->ifa; 1028 struct in6_ifaddr *ifa6; 1029 int ifa_plen; 1030 u_int32_t storedlifetime; 1031 1032 if (ifa->ifa_addr->sa_family != AF_INET6) 1033 continue; 1034 1035 ifa6 = (struct in6_ifaddr *)ifa; 1036 1037 /* 1038 * Spec is not clear here, but I believe we should concentrate 1039 * on unicast (i.e. not anycast) addresses. 1040 * XXX: other ia6_flags? detached or duplicated? 1041 */ 1042 if (ifa6->ia6_flags & IN6_IFF_ANYCAST) 1043 continue; 1044 1045 ifa_plen = in6_mask2len(&ifa6->ia_prefixmask.sin6_addr, NULL); 1046 if (ifa_plen != new->ndpr_plen || 1047 !in6_are_prefix_equal(&ifa6->ia_addr.sin6_addr, 1048 &new->ndpr_prefix.sin6_addr, 1049 ifa_plen)) 1050 continue; 1051 1052 if (ia6_match == NULL) /* remember the first one */ 1053 ia6_match = ifa6; 1054 1055 if (!(ifa6->ia6_flags & IN6_IFF_AUTOCONF)) 1056 continue; 1057 1058 /* 1059 * An already autoconfigured address matched. Now that we 1060 * are sure there is at least one matched address, we can 1061 * proceed to 5.5.3. (e): update the lifetimes according to the 1062 * "two hours" rule and the privacy extension. 1063 */ 1064 #define TWOHOUR (120*60) 1065 lt6_tmp = ifa6->ia6_lifetime; 1066 1067 if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME) 1068 storedlifetime = ND6_INFINITE_LIFETIME; 1069 else if (IFA6_IS_INVALID(ifa6)) 1070 storedlifetime = 0; 1071 else 1072 storedlifetime = lt6_tmp.ia6t_expire - time_second; 1073 1074 /* when not updating, keep the current stored lifetime. */ 1075 lt6_tmp.ia6t_vltime = storedlifetime; 1076 1077 if (TWOHOUR < new->ndpr_vltime || 1078 storedlifetime < new->ndpr_vltime) { 1079 lt6_tmp.ia6t_vltime = new->ndpr_vltime; 1080 } else if (storedlifetime <= TWOHOUR 1081 #if 0 1082 /* 1083 * This condition is logically redundant, so we just 1084 * omit it. 1085 * See IPng 6712, 6717, and 6721. 1086 */ 1087 && new->ndpr_vltime <= storedlifetime 1088 #endif 1089 ) { 1090 if (auth) { 1091 lt6_tmp.ia6t_vltime = new->ndpr_vltime; 1092 } 1093 } else { 1094 /* 1095 * new->ndpr_vltime <= TWOHOUR && 1096 * TWOHOUR < storedlifetime 1097 */ 1098 lt6_tmp.ia6t_vltime = TWOHOUR; 1099 } 1100 1101 /* The 2 hour rule is not imposed for preferred lifetime. */ 1102 lt6_tmp.ia6t_pltime = new->ndpr_pltime; 1103 1104 in6_init_address_ltimes(pr, <6_tmp); 1105 1106 /* 1107 * When adjusting the lifetimes of an existing temporary 1108 * address, only lower the lifetimes. 1109 * RFC 3041 3.3. (1). 1110 * XXX: how should we modify ia6t_[pv]ltime? 1111 */ 1112 if (ifa6->ia6_flags & IN6_IFF_TEMPORARY) { 1113 if (lt6_tmp.ia6t_expire == 0 || /* no expire */ 1114 lt6_tmp.ia6t_expire > 1115 ifa6->ia6_lifetime.ia6t_expire) { 1116 lt6_tmp.ia6t_expire = 1117 ifa6->ia6_lifetime.ia6t_expire; 1118 } 1119 if (lt6_tmp.ia6t_preferred == 0 || /* no expire */ 1120 lt6_tmp.ia6t_preferred > 1121 ifa6->ia6_lifetime.ia6t_preferred) { 1122 lt6_tmp.ia6t_preferred = 1123 ifa6->ia6_lifetime.ia6t_preferred; 1124 } 1125 } 1126 1127 ifa6->ia6_lifetime = lt6_tmp; 1128 } 1129 if (ia6_match == NULL && new->ndpr_vltime) { 1130 /* 1131 * No address matched and the valid lifetime is non-zero. 1132 * Create a new address. 1133 */ 1134 if ((ia6 = in6_ifadd(new, NULL)) != NULL) { 1135 /* 1136 * note that we should use pr (not new) for reference. 1137 */ 1138 pr->ndpr_refcnt++; 1139 ia6->ia6_ndpr = pr; 1140 1141 #if 0 1142 /* XXXYYY Don't do this, according to Jinmei. */ 1143 pr->ndpr_addr = new->ndpr_addr; 1144 #endif 1145 1146 /* 1147 * RFC 3041 3.3 (2). 1148 * When a new public address is created as described 1149 * in RFC2462, also create a new temporary address. 1150 * 1151 * RFC 3041 3.5. 1152 * When an interface connects to a new link, a new 1153 * randomized interface identifier should be generated 1154 * immediately together with a new set of temporary 1155 * addresses. Thus, we specifiy 1 as the 2nd arg of 1156 * in6_tmpifadd(). 1157 */ 1158 if (ip6_use_tempaddr) { 1159 int e; 1160 if ((e = in6_tmpifadd(ia6, 1)) != 0) { 1161 nd6log((LOG_NOTICE, "prelist_update: " 1162 "failed to create a temporary " 1163 "address, errno=%d\n", 1164 e)); 1165 } 1166 } 1167 1168 /* 1169 * A newly added address might affect the status 1170 * of other addresses, so we check and update it. 1171 * XXX: what if address duplication happens? 1172 */ 1173 pfxlist_onlink_check(); 1174 } else { 1175 /* just set an error. do not bark here. */ 1176 error = EADDRNOTAVAIL; /* XXX: might be unused. */ 1177 } 1178 } 1179 1180 afteraddrconf: 1181 1182 end: 1183 mtx_unlock(&nd6_mtx); 1184 return error; 1185 } 1186 1187 /* 1188 * A supplement function used in the on-link detection below; 1189 * detect if a given prefix has a (probably) reachable advertising router. 1190 * XXX: lengthy function name... 1191 */ 1192 static struct nd_pfxrouter * 1193 find_pfxlist_reachable_router(struct nd_prefix *pr) 1194 { 1195 struct nd_pfxrouter *pfxrtr; 1196 struct rtentry *rt; 1197 struct llinfo_nd6 *ln; 1198 1199 for (pfxrtr = LIST_FIRST(&pr->ndpr_advrtrs); pfxrtr; 1200 pfxrtr = LIST_NEXT(pfxrtr, pfr_entry)) { 1201 if ((rt = nd6_lookup(&pfxrtr->router->rtaddr, 0, 1202 pfxrtr->router->ifp)) && 1203 (ln = (struct llinfo_nd6 *)rt->rt_llinfo) && 1204 ND6_IS_LLINFO_PROBREACH(ln)) 1205 break; /* found */ 1206 } 1207 1208 return (pfxrtr); 1209 1210 } 1211 1212 /* 1213 * Check if each prefix in the prefix list has at least one available router 1214 * that advertised the prefix (a router is "available" if its neighbor cache 1215 * entry is reachable or probably reachable). 1216 * If the check fails, the prefix may be off-link, because, for example, 1217 * we have moved from the network but the lifetime of the prefix has not 1218 * expired yet. So we should not use the prefix if there is another prefix 1219 * that has an available router. 1220 * But, if there is no prefix that has an available router, we still regards 1221 * all the prefixes as on-link. This is because we can't tell if all the 1222 * routers are simply dead or if we really moved from the network and there 1223 * is no router around us. 1224 */ 1225 void 1226 pfxlist_onlink_check(void) 1227 { 1228 struct nd_prefix *pr; 1229 struct in6_ifaddr *ifa; 1230 1231 /* 1232 * Check if there is a prefix that has a reachable advertising 1233 * router. 1234 */ 1235 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 1236 if (pr->ndpr_raf_onlink && find_pfxlist_reachable_router(pr)) 1237 break; 1238 } 1239 1240 if (pr) { 1241 /* 1242 * There is at least one prefix that has a reachable router. 1243 * Detach prefixes which have no reachable advertising 1244 * router, and attach other prefixes. 1245 */ 1246 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 1247 /* XXX: a link-local prefix should never be detached */ 1248 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr)) 1249 continue; 1250 1251 /* 1252 * we aren't interested in prefixes without the L bit 1253 * set. 1254 */ 1255 if (pr->ndpr_raf_onlink == 0) 1256 continue; 1257 1258 if (!(pr->ndpr_stateflags & NDPRF_DETACHED) && 1259 find_pfxlist_reachable_router(pr) == NULL) 1260 pr->ndpr_stateflags |= NDPRF_DETACHED; 1261 if ((pr->ndpr_stateflags & NDPRF_DETACHED) && 1262 find_pfxlist_reachable_router(pr) != 0) 1263 pr->ndpr_stateflags &= ~NDPRF_DETACHED; 1264 } 1265 } else { 1266 /* there is no prefix that has a reachable router */ 1267 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 1268 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr)) 1269 continue; 1270 1271 if (pr->ndpr_raf_onlink == 0) 1272 continue; 1273 1274 if (pr->ndpr_stateflags & NDPRF_DETACHED) 1275 pr->ndpr_stateflags &= ~NDPRF_DETACHED; 1276 } 1277 } 1278 1279 /* 1280 * Remove each interface route associated with a (just) detached 1281 * prefix, and reinstall the interface route for a (just) attached 1282 * prefix. Note that all attempt of reinstallation does not 1283 * necessarily success, when a same prefix is shared among multiple 1284 * interfaces. Such cases will be handled in nd6_prefix_onlink, 1285 * so we don't have to care about them. 1286 */ 1287 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 1288 int e; 1289 1290 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr)) 1291 continue; 1292 1293 if (pr->ndpr_raf_onlink == 0) 1294 continue; 1295 1296 if ((pr->ndpr_stateflags & NDPRF_DETACHED) && 1297 (pr->ndpr_stateflags & NDPRF_ONLINK)) { 1298 if ((e = nd6_prefix_offlink(pr)) != 0) { 1299 nd6log((LOG_ERR, 1300 "pfxlist_onlink_check: failed to " 1301 "make %s/%d offlink, errno=%d\n", 1302 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 1303 pr->ndpr_plen, e)); 1304 } 1305 } 1306 if (!(pr->ndpr_stateflags & NDPRF_DETACHED) && 1307 !(pr->ndpr_stateflags & NDPRF_ONLINK) && 1308 pr->ndpr_raf_onlink) { 1309 if ((e = nd6_prefix_onlink(pr)) != 0) { 1310 nd6log((LOG_ERR, 1311 "pfxlist_onlink_check: failed to " 1312 "make %s/%d offlink, errno=%d\n", 1313 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 1314 pr->ndpr_plen, e)); 1315 } 1316 } 1317 } 1318 1319 /* 1320 * Changes on the prefix status might affect address status as well. 1321 * Make sure that all addresses derived from an attached prefix are 1322 * attached, and that all addresses derived from a detached prefix are 1323 * detached. Note, however, that a manually configured address should 1324 * always be attached. 1325 * The precise detection logic is same as the one for prefixes. 1326 */ 1327 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) { 1328 if (!(ifa->ia6_flags & IN6_IFF_AUTOCONF)) 1329 continue; 1330 1331 if (ifa->ia6_ndpr == NULL) { 1332 /* 1333 * This can happen when we first configure the address 1334 * (i.e. the address exists, but the prefix does not). 1335 * XXX: complicated relationships... 1336 */ 1337 continue; 1338 } 1339 1340 if (find_pfxlist_reachable_router(ifa->ia6_ndpr)) 1341 break; 1342 } 1343 if (ifa) { 1344 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) { 1345 if (!(ifa->ia6_flags & IN6_IFF_AUTOCONF)) 1346 continue; 1347 1348 if (ifa->ia6_ndpr == NULL) /* XXX: see above. */ 1349 continue; 1350 1351 if (find_pfxlist_reachable_router(ifa->ia6_ndpr)) 1352 ifa->ia6_flags &= ~IN6_IFF_DETACHED; 1353 else 1354 ifa->ia6_flags |= IN6_IFF_DETACHED; 1355 } 1356 } 1357 else { 1358 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) { 1359 if (!(ifa->ia6_flags & IN6_IFF_AUTOCONF)) 1360 continue; 1361 1362 ifa->ia6_flags &= ~IN6_IFF_DETACHED; 1363 } 1364 } 1365 } 1366 1367 int 1368 nd6_prefix_onlink(struct nd_prefix *pr) 1369 { 1370 struct ifaddr *ifa; 1371 struct ifnet *ifp = pr->ndpr_ifp; 1372 struct sockaddr_in6 mask6; 1373 struct nd_prefix *opr; 1374 u_long rtflags; 1375 int error = 0; 1376 1377 /* sanity check */ 1378 if (pr->ndpr_stateflags & NDPRF_ONLINK) { 1379 nd6log((LOG_ERR, 1380 "nd6_prefix_onlink: %s/%d is already on-link\n", 1381 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen); 1382 return (EEXIST)); 1383 } 1384 1385 /* 1386 * Add the interface route associated with the prefix. Before 1387 * installing the route, check if there's the same prefix on another 1388 * interface, and the prefix has already installed the interface route. 1389 * Although such a configuration is expected to be rare, we explicitly 1390 * allow it. 1391 */ 1392 for (opr = nd_prefix.lh_first; opr; opr = opr->ndpr_next) { 1393 if (opr == pr) 1394 continue; 1395 1396 if (!(opr->ndpr_stateflags & NDPRF_ONLINK)) 1397 continue; 1398 1399 if (opr->ndpr_plen == pr->ndpr_plen && 1400 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr, 1401 &opr->ndpr_prefix.sin6_addr, 1402 pr->ndpr_plen)) 1403 return (0); 1404 } 1405 1406 /* 1407 * We prefer link-local addresses as the associated interface address. 1408 */ 1409 /* search for a link-local addr */ 1410 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 1411 IN6_IFF_NOTREADY| 1412 IN6_IFF_ANYCAST); 1413 if (ifa == NULL) { 1414 struct ifaddr_container *ifac; 1415 1416 /* XXX: freebsd does not have ifa_ifwithaf */ 1417 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1418 if (ifac->ifa->ifa_addr->sa_family == AF_INET6) { 1419 ifa = ifac->ifa; 1420 break; 1421 } 1422 } 1423 /* should we care about ia6_flags? */ 1424 } 1425 if (ifa == NULL) { 1426 /* 1427 * This can still happen, when, for example, we receive an RA 1428 * containing a prefix with the L bit set and the A bit clear, 1429 * after removing all IPv6 addresses on the receiving 1430 * interface. This should, of course, be rare though. 1431 */ 1432 nd6log((LOG_NOTICE, 1433 "nd6_prefix_onlink: failed to find any ifaddr" 1434 " to add route for a prefix(%s/%d) on %s\n", 1435 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 1436 pr->ndpr_plen, if_name(ifp))); 1437 return (0); 1438 } 1439 1440 /* 1441 * in6_ifinit() sets nd6_rtrequest to ifa_rtrequest for all ifaddrs. 1442 * ifa->ifa_rtrequest = nd6_rtrequest; 1443 */ 1444 bzero(&mask6, sizeof(mask6)); 1445 mask6.sin6_len = sizeof(mask6); 1446 mask6.sin6_addr = pr->ndpr_mask; 1447 rtflags = ifa->ifa_flags | RTF_CLONING | RTF_UP; 1448 if (nd6_need_cache(ifp)) { 1449 /* explicitly set in case ifa_flags does not set the flag. */ 1450 rtflags |= RTF_CLONING; 1451 } else { 1452 /* 1453 * explicitly clear the cloning bit in case ifa_flags sets it. 1454 */ 1455 rtflags &= ~RTF_CLONING; 1456 } 1457 error = rtrequest_global(RTM_ADD, 1458 (struct sockaddr *)&pr->ndpr_prefix, 1459 ifa->ifa_addr, 1460 (struct sockaddr *)&mask6, 1461 rtflags); 1462 if (error == 0) { 1463 pr->ndpr_stateflags |= NDPRF_ONLINK; 1464 } 1465 else { 1466 nd6log((LOG_ERR, "nd6_prefix_onlink: failed to add route for a" 1467 " prefix (%s/%d) on %s, gw=%s, mask=%s, flags=%lx " 1468 "errno = %d\n", 1469 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 1470 pr->ndpr_plen, if_name(ifp), 1471 ip6_sprintf(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr), 1472 ip6_sprintf(&mask6.sin6_addr), rtflags, error)); 1473 } 1474 return (error); 1475 } 1476 1477 int 1478 nd6_prefix_offlink(struct nd_prefix *pr) 1479 { 1480 int error = 0; 1481 struct ifnet *ifp = pr->ndpr_ifp; 1482 struct nd_prefix *opr; 1483 struct sockaddr_in6 sa6, mask6; 1484 1485 /* sanity check */ 1486 if (!(pr->ndpr_stateflags & NDPRF_ONLINK)) { 1487 nd6log((LOG_ERR, 1488 "nd6_prefix_offlink: %s/%d is already off-link\n", 1489 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen)); 1490 return (EEXIST); 1491 } 1492 1493 bzero(&sa6, sizeof(sa6)); 1494 sa6.sin6_family = AF_INET6; 1495 sa6.sin6_len = sizeof(sa6); 1496 bcopy(&pr->ndpr_prefix.sin6_addr, &sa6.sin6_addr, 1497 sizeof(struct in6_addr)); 1498 bzero(&mask6, sizeof(mask6)); 1499 mask6.sin6_family = AF_INET6; 1500 mask6.sin6_len = sizeof(sa6); 1501 bcopy(&pr->ndpr_mask, &mask6.sin6_addr, sizeof(struct in6_addr)); 1502 error = rtrequest_global(RTM_DELETE, 1503 (struct sockaddr *)&sa6, 1504 NULL, 1505 (struct sockaddr *)&mask6, 1506 0); 1507 if (error == 0) { 1508 pr->ndpr_stateflags &= ~NDPRF_ONLINK; 1509 1510 /* 1511 * There might be the same prefix on another interface, 1512 * the prefix which could not be on-link just because we have 1513 * the interface route (see comments in nd6_prefix_onlink). 1514 * If there's one, try to make the prefix on-link on the 1515 * interface. 1516 */ 1517 for (opr = nd_prefix.lh_first; opr; opr = opr->ndpr_next) { 1518 if (opr == pr) 1519 continue; 1520 1521 if (opr->ndpr_stateflags & NDPRF_ONLINK) 1522 continue; 1523 1524 /* 1525 * KAME specific: detached prefixes should not be 1526 * on-link. 1527 */ 1528 if (opr->ndpr_stateflags & NDPRF_DETACHED) 1529 continue; 1530 1531 if (opr->ndpr_plen == pr->ndpr_plen && 1532 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr, 1533 &opr->ndpr_prefix.sin6_addr, 1534 pr->ndpr_plen)) { 1535 int e; 1536 1537 if ((e = nd6_prefix_onlink(opr)) != 0) { 1538 nd6log((LOG_ERR, 1539 "nd6_prefix_offlink: failed to " 1540 "recover a prefix %s/%d from %s " 1541 "to %s (errno = %d)\n", 1542 ip6_sprintf(&opr->ndpr_prefix.sin6_addr), 1543 opr->ndpr_plen, if_name(ifp), 1544 if_name(opr->ndpr_ifp), e)); 1545 } 1546 } 1547 } 1548 } 1549 else { 1550 /* XXX: can we still set the NDPRF_ONLINK flag? */ 1551 nd6log((LOG_ERR, 1552 "nd6_prefix_offlink: failed to delete route: " 1553 "%s/%d on %s (errno = %d)\n", 1554 ip6_sprintf(&sa6.sin6_addr), pr->ndpr_plen, if_name(ifp), 1555 error)); 1556 } 1557 1558 return (error); 1559 } 1560 1561 /* 1562 * Parameters: 1563 * ifid: Mobile IPv6 addition 1564 */ 1565 static struct in6_ifaddr * 1566 in6_ifadd(struct nd_prefix *pr, struct in6_addr *ifid) 1567 { 1568 struct ifnet *ifp = pr->ndpr_ifp; 1569 struct ifaddr *ifa; 1570 struct in6_aliasreq ifra; 1571 struct in6_ifaddr *ia, *ib; 1572 int error, plen0; 1573 struct in6_addr mask; 1574 int prefixlen = pr->ndpr_plen; 1575 1576 in6_len2mask(&mask, prefixlen); 1577 1578 /* 1579 * find a link-local address (will be interface ID). 1580 * Is it really mandatory? Theoretically, a global or a site-local 1581 * address can be configured without a link-local address, if we 1582 * have a unique interface identifier... 1583 * 1584 * it is not mandatory to have a link-local address, we can generate 1585 * interface identifier on the fly. we do this because: 1586 * (1) it should be the easiest way to find interface identifier. 1587 * (2) RFC2462 5.4 suggesting the use of the same interface identifier 1588 * for multiple addresses on a single interface, and possible shortcut 1589 * of DAD. we omitted DAD for this reason in the past. 1590 * (3) a user can prevent autoconfiguration of global address 1591 * by removing link-local address by hand (this is partly because we 1592 * don't have other way to control the use of IPv6 on a interface. 1593 * this has been our design choice - cf. NRL's "ifconfig auto"). 1594 * (4) it is easier to manage when an interface has addresses 1595 * with the same interface identifier, than to have multiple addresses 1596 * with different interface identifiers. 1597 * 1598 * Mobile IPv6 addition: allow for caller to specify a wished interface 1599 * ID. This is to not break connections when moving addresses between 1600 * interfaces. 1601 */ 1602 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0);/* 0 is OK? */ 1603 if (ifa) 1604 ib = (struct in6_ifaddr *)ifa; 1605 else 1606 return NULL; 1607 1608 #if 0 /* don't care link local addr state, and always do DAD */ 1609 /* if link-local address is not eligible, do not autoconfigure. */ 1610 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) { 1611 kprintf("in6_ifadd: link-local address not ready\n"); 1612 return NULL; 1613 } 1614 #endif 1615 1616 /* prefixlen + ifidlen must be equal to 128 */ 1617 plen0 = in6_mask2len(&ib->ia_prefixmask.sin6_addr, NULL); 1618 if (prefixlen != plen0) { 1619 nd6log((LOG_INFO, "in6_ifadd: wrong prefixlen for %s " 1620 "(prefix=%d ifid=%d)\n", 1621 if_name(ifp), prefixlen, 128 - plen0)); 1622 return NULL; 1623 } 1624 1625 /* make ifaddr */ 1626 1627 bzero(&ifra, sizeof(ifra)); 1628 /* 1629 * in6_update_ifa() does not use ifra_name, but we accurately set it 1630 * for safety. 1631 */ 1632 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 1633 ifra.ifra_addr.sin6_family = AF_INET6; 1634 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 1635 /* prefix */ 1636 bcopy(&pr->ndpr_prefix.sin6_addr, &ifra.ifra_addr.sin6_addr, 1637 sizeof(ifra.ifra_addr.sin6_addr)); 1638 ifra.ifra_addr.sin6_addr.s6_addr32[0] &= mask.s6_addr32[0]; 1639 ifra.ifra_addr.sin6_addr.s6_addr32[1] &= mask.s6_addr32[1]; 1640 ifra.ifra_addr.sin6_addr.s6_addr32[2] &= mask.s6_addr32[2]; 1641 ifra.ifra_addr.sin6_addr.s6_addr32[3] &= mask.s6_addr32[3]; 1642 1643 /* interface ID */ 1644 if (ifid == NULL || IN6_IS_ADDR_UNSPECIFIED(ifid)) 1645 ifid = &ib->ia_addr.sin6_addr; 1646 ifra.ifra_addr.sin6_addr.s6_addr32[0] 1647 |= (ifid->s6_addr32[0] & ~mask.s6_addr32[0]); 1648 ifra.ifra_addr.sin6_addr.s6_addr32[1] 1649 |= (ifid->s6_addr32[1] & ~mask.s6_addr32[1]); 1650 ifra.ifra_addr.sin6_addr.s6_addr32[2] 1651 |= (ifid->s6_addr32[2] & ~mask.s6_addr32[2]); 1652 ifra.ifra_addr.sin6_addr.s6_addr32[3] 1653 |= (ifid->s6_addr32[3] & ~mask.s6_addr32[3]); 1654 1655 /* new prefix mask. */ 1656 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 1657 ifra.ifra_prefixmask.sin6_family = AF_INET6; 1658 bcopy(&mask, &ifra.ifra_prefixmask.sin6_addr, 1659 sizeof(ifra.ifra_prefixmask.sin6_addr)); 1660 1661 /* 1662 * lifetime. 1663 * XXX: in6_init_address_ltimes would override these values later. 1664 * We should reconsider this logic. 1665 */ 1666 ifra.ifra_lifetime.ia6t_vltime = pr->ndpr_vltime; 1667 ifra.ifra_lifetime.ia6t_pltime = pr->ndpr_pltime; 1668 1669 /* XXX: scope zone ID? */ 1670 1671 ifra.ifra_flags |= IN6_IFF_AUTOCONF; /* obey autoconf */ 1672 /* 1673 * temporarily set the nopfx flag to avoid conflict. 1674 * XXX: we should reconsider the entire mechanism about prefix 1675 * manipulation. 1676 */ 1677 ifra.ifra_flags |= IN6_IFF_NOPFX; 1678 1679 /* 1680 * keep the new address, regardless of the result of in6_update_ifa. 1681 * XXX: this address is now meaningless. 1682 * We should reconsider its role. 1683 */ 1684 pr->ndpr_addr = ifra.ifra_addr.sin6_addr; 1685 1686 /* allocate ifaddr structure, link into chain, etc. */ 1687 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) { 1688 nd6log((LOG_ERR, 1689 "in6_ifadd: failed to make ifaddr %s on %s (errno=%d)\n", 1690 ip6_sprintf(&ifra.ifra_addr.sin6_addr), if_name(ifp), 1691 error)); 1692 return (NULL); /* ifaddr must not have been allocated. */ 1693 } 1694 1695 ia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr); 1696 1697 return (ia); /* this must NOT be NULL. */ 1698 } 1699 1700 /* 1701 * Parameters: 1702 * ia0: corresponding public address 1703 */ 1704 int 1705 in6_tmpifadd(const struct in6_ifaddr *ia0, int forcegen) 1706 { 1707 struct ifnet *ifp = ia0->ia_ifa.ifa_ifp; 1708 struct in6_ifaddr *newia; 1709 struct in6_aliasreq ifra; 1710 int i, error; 1711 int trylimit = 3; /* XXX: adhoc value */ 1712 u_int32_t randid[2]; 1713 time_t vltime0, pltime0; 1714 1715 bzero(&ifra, sizeof(ifra)); 1716 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 1717 ifra.ifra_addr = ia0->ia_addr; 1718 /* copy prefix mask */ 1719 ifra.ifra_prefixmask = ia0->ia_prefixmask; 1720 /* clear the old IFID */ 1721 for (i = 0; i < 4; i++) { 1722 ifra.ifra_addr.sin6_addr.s6_addr32[i] 1723 &= ifra.ifra_prefixmask.sin6_addr.s6_addr32[i]; 1724 } 1725 1726 again: 1727 in6_get_tmpifid(ifp, (u_int8_t *)randid, 1728 (const u_int8_t *)&ia0->ia_addr.sin6_addr.s6_addr[8], 1729 forcegen); 1730 ifra.ifra_addr.sin6_addr.s6_addr32[2] 1731 |= (randid[0] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[2])); 1732 ifra.ifra_addr.sin6_addr.s6_addr32[3] 1733 |= (randid[1] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[3])); 1734 1735 /* 1736 * If by chance the new temporary address is the same as an address 1737 * already assigned to the interface, generate a new randomized 1738 * interface identifier and repeat this step. 1739 * RFC 3041 3.3 (4). 1740 */ 1741 if (in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr) != NULL) { 1742 if (trylimit-- == 0) { 1743 nd6log((LOG_NOTICE, "in6_tmpifadd: failed to find " 1744 "a unique random IFID\n")); 1745 return (EEXIST); 1746 } 1747 forcegen = 1; 1748 goto again; 1749 } 1750 1751 /* 1752 * The Valid Lifetime is the lower of the Valid Lifetime of the 1753 * public address or TEMP_VALID_LIFETIME. 1754 * The Preferred Lifetime is the lower of the Preferred Lifetime 1755 * of the public address or TEMP_PREFERRED_LIFETIME - 1756 * DESYNC_FACTOR. 1757 */ 1758 if (ia0->ia6_lifetime.ia6t_expire != 0) { 1759 vltime0 = IFA6_IS_INVALID(ia0) ? 0 : 1760 (ia0->ia6_lifetime.ia6t_expire - time_second); 1761 if (vltime0 > ip6_temp_valid_lifetime) 1762 vltime0 = ip6_temp_valid_lifetime; 1763 } else 1764 vltime0 = ip6_temp_valid_lifetime; 1765 if (ia0->ia6_lifetime.ia6t_preferred != 0) { 1766 pltime0 = IFA6_IS_DEPRECATED(ia0) ? 0 : 1767 (ia0->ia6_lifetime.ia6t_preferred - time_second); 1768 if (pltime0 > ip6_temp_preferred_lifetime - ip6_desync_factor) { 1769 pltime0 = ip6_temp_preferred_lifetime - 1770 ip6_desync_factor; 1771 } 1772 } else 1773 pltime0 = ip6_temp_preferred_lifetime - ip6_desync_factor; 1774 ifra.ifra_lifetime.ia6t_vltime = vltime0; 1775 ifra.ifra_lifetime.ia6t_pltime = pltime0; 1776 1777 /* 1778 * A temporary address is created only if this calculated Preferred 1779 * Lifetime is greater than REGEN_ADVANCE time units. 1780 */ 1781 if (ifra.ifra_lifetime.ia6t_pltime <= ip6_temp_regen_advance) 1782 return (0); 1783 1784 /* XXX: scope zone ID? */ 1785 1786 ifra.ifra_flags |= (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY); 1787 1788 /* allocate ifaddr structure, link into chain, etc. */ 1789 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) 1790 return (error); 1791 1792 newia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr); 1793 if (newia == NULL) { /* XXX: can it happen? */ 1794 nd6log((LOG_ERR, 1795 "in6_tmpifadd: ifa update succeeded, but we got " 1796 "no ifaddr\n")); 1797 return (EINVAL); /* XXX */ 1798 } 1799 newia->ia6_ndpr = ia0->ia6_ndpr; 1800 newia->ia6_ndpr->ndpr_refcnt++; 1801 1802 return (0); 1803 } 1804 1805 int 1806 in6_init_prefix_ltimes(struct nd_prefix *ndpr) 1807 { 1808 /* check if preferred lifetime > valid lifetime. RFC2462 5.5.3 (c) */ 1809 if (ndpr->ndpr_pltime > ndpr->ndpr_vltime) { 1810 nd6log((LOG_INFO, "in6_init_prefix_ltimes: preferred lifetime" 1811 "(%d) is greater than valid lifetime(%d)\n", 1812 (u_int)ndpr->ndpr_pltime, (u_int)ndpr->ndpr_vltime)); 1813 return (EINVAL); 1814 } 1815 if (ndpr->ndpr_pltime == ND6_INFINITE_LIFETIME) 1816 ndpr->ndpr_preferred = 0; 1817 else 1818 ndpr->ndpr_preferred = time_second + ndpr->ndpr_pltime; 1819 if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME) 1820 ndpr->ndpr_expire = 0; 1821 else 1822 ndpr->ndpr_expire = time_second + ndpr->ndpr_vltime; 1823 1824 return 0; 1825 } 1826 1827 static void 1828 in6_init_address_ltimes(struct nd_prefix *new, struct in6_addrlifetime *lt6) 1829 { 1830 /* init ia6t_expire */ 1831 if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME) 1832 lt6->ia6t_expire = 0; 1833 else { 1834 lt6->ia6t_expire = time_second; 1835 lt6->ia6t_expire += lt6->ia6t_vltime; 1836 } 1837 1838 /* init ia6t_preferred */ 1839 if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME) 1840 lt6->ia6t_preferred = 0; 1841 else { 1842 lt6->ia6t_preferred = time_second; 1843 lt6->ia6t_preferred += lt6->ia6t_pltime; 1844 } 1845 } 1846 1847 /* 1848 * Delete all the routing table entries that use the specified gateway. 1849 * 1850 * XXX: this function causes search through all entries of routing table, so 1851 * it shouldn't be called when acting as a router. 1852 */ 1853 void 1854 rt6_flush(struct in6_addr *gateway, struct ifnet *ifp) 1855 { 1856 struct radix_node_head *rnh = rt_tables[mycpuid][AF_INET6]; 1857 1858 /* We'll care only link-local addresses */ 1859 if (!IN6_IS_ADDR_LINKLOCAL(gateway)) 1860 return; 1861 /* XXX: hack for KAME's link-local address kludge */ 1862 gateway->s6_addr16[1] = htons(ifp->if_index); 1863 1864 rnh->rnh_walktree(rnh, rt6_deleteroute, (void *)gateway); 1865 } 1866 1867 static int 1868 rt6_deleteroute(struct radix_node *rn, void *arg) 1869 { 1870 #define SIN6(s) ((struct sockaddr_in6 *)s) 1871 struct rtentry *rt = (struct rtentry *)rn; 1872 struct in6_addr *gate = (struct in6_addr *)arg; 1873 1874 if (rt->rt_gateway == NULL || rt->rt_gateway->sa_family != AF_INET6) 1875 return (0); 1876 1877 if (!IN6_ARE_ADDR_EQUAL(gate, &SIN6(rt->rt_gateway)->sin6_addr)) 1878 return (0); 1879 1880 /* 1881 * Do not delete a static route. 1882 * XXX: this seems to be a bit ad-hoc. Should we consider the 1883 * 'cloned' bit instead? 1884 */ 1885 if (rt->rt_flags & RTF_STATIC) 1886 return (0); 1887 1888 /* 1889 * We delete only host route. This means, in particular, we don't 1890 * delete default route. 1891 */ 1892 if (!(rt->rt_flags & RTF_HOST)) 1893 return (0); 1894 1895 return (rtrequest(RTM_DELETE, rt_key(rt), 1896 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0)); 1897 #undef SIN6 1898 } 1899 1900 int 1901 nd6_setdefaultiface(int ifindex) 1902 { 1903 int error = 0; 1904 1905 if (ifindex < 0 || if_index < ifindex) 1906 return (EINVAL); 1907 1908 if (nd6_defifindex != ifindex) { 1909 nd6_defifindex = ifindex; 1910 if (nd6_defifindex > 0) 1911 nd6_defifp = ifindex2ifnet[nd6_defifindex]; 1912 else 1913 nd6_defifp = NULL; 1914 1915 /* 1916 * If the Default Router List is empty, install a route 1917 * to the specified interface as default or remove the default 1918 * route when the default interface becomes canceled. 1919 * The check for the queue is actually redundant, but 1920 * we do this here to avoid re-install the default route 1921 * if the list is NOT empty. 1922 */ 1923 if (TAILQ_FIRST(&nd_defrouter) == NULL) 1924 defrouter_select(); 1925 1926 /* 1927 * Our current implementation assumes one-to-one maping between 1928 * interfaces and links, so it would be natural to use the 1929 * default interface as the default link. 1930 */ 1931 scope6_setdefault(nd6_defifp); 1932 } 1933 1934 return (error); 1935 } 1936