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