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/mutex2.h> 51 52 #include <net/if.h> 53 #include <net/if_types.h> 54 #include <net/if_dl.h> 55 #include <net/route.h> 56 #include <net/radix.h> 57 58 #include <netinet/in.h> 59 #include <netinet6/in6_var.h> 60 #include <netinet6/in6_ifattach.h> 61 #include <netinet/ip6.h> 62 #include <netinet6/ip6_var.h> 63 #include <netinet6/nd6.h> 64 #include <netinet/icmp6.h> 65 #include <netinet6/scope6_var.h> 66 67 #include <net/net_osdep.h> 68 69 #define SDL(s) ((struct sockaddr_dl *)s) 70 71 static struct nd_defrouter *defrtrlist_update (struct nd_defrouter *); 72 static struct in6_ifaddr *in6_ifadd (struct nd_prefix *, 73 struct in6_addr *); 74 static struct nd_pfxrouter *pfxrtr_lookup (struct nd_prefix *, 75 struct nd_defrouter *); 76 static void pfxrtr_add (struct nd_prefix *, struct nd_defrouter *); 77 static void pfxrtr_del (struct nd_pfxrouter *); 78 static struct nd_pfxrouter *find_pfxlist_reachable_router 79 (struct nd_prefix *); 80 static void defrouter_addifreq (struct ifnet *); 81 82 static void in6_init_address_ltimes(struct nd_prefix *ndpr, 83 struct in6_addrlifetime *lt6); 84 85 static int rt6_deleteroute (struct radix_node *, void *); 86 87 extern int nd6_recalc_reachtm_interval; 88 89 static struct ifnet *nd6_defifp; 90 int nd6_defifindex; 91 92 int ip6_use_tempaddr = 0; 93 94 int ip6_desync_factor; 95 u_int32_t ip6_temp_preferred_lifetime = DEF_TEMP_PREFERRED_LIFETIME; 96 u_int32_t ip6_temp_valid_lifetime = DEF_TEMP_VALID_LIFETIME; 97 /* 98 * shorter lifetimes for debugging purposes. 99 int ip6_temp_preferred_lifetime = 800; 100 static int ip6_temp_valid_lifetime = 1800; 101 */ 102 int ip6_temp_regen_advance = TEMPADDR_REGEN_ADVANCE; 103 104 /* 105 * Receive Router Solicitation Message - just for routers. 106 * Router solicitation/advertisement is mostly managed by userland program 107 * (rtadvd) so here we have no function like nd6_ra_output(). 108 * 109 * Based on RFC 2461 110 */ 111 void 112 nd6_rs_input(struct mbuf *m, int off, int icmp6len) 113 { 114 struct ifnet *ifp = m->m_pkthdr.rcvif; 115 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 116 struct nd_router_solicit *nd_rs; 117 struct in6_addr saddr6 = ip6->ip6_src; 118 char *lladdr = NULL; 119 int lladdrlen = 0; 120 #if 0 121 struct sockaddr_dl *sdl = NULL; 122 struct llinfo_nd6 *ln = NULL; 123 struct rtentry *rt = NULL; 124 int is_newentry; 125 #endif 126 union nd_opts ndopts; 127 128 /* If I'm not a router, ignore it. */ 129 if (ip6_accept_rtadv != 0 || ip6_forwarding != 1) 130 goto freeit; 131 132 /* Sanity checks */ 133 if (ip6->ip6_hlim != 255) { 134 nd6log((LOG_ERR, 135 "nd6_rs_input: invalid hlim (%d) from %s to %s on %s\n", 136 ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src), 137 ip6_sprintf(&ip6->ip6_dst), if_name(ifp))); 138 goto bad; 139 } 140 141 /* 142 * Don't update the neighbor cache, if src = ::. 143 * This indicates that the src has no IP address assigned yet. 144 */ 145 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) 146 goto freeit; 147 148 #ifndef PULLDOWN_TEST 149 IP6_EXTHDR_CHECK(m, off, icmp6len,); 150 nd_rs = (struct nd_router_solicit *)((caddr_t)ip6 + off); 151 #else 152 IP6_EXTHDR_GET(nd_rs, struct nd_router_solicit *, m, off, icmp6len); 153 if (nd_rs == NULL) { 154 icmp6stat.icp6s_tooshort++; 155 return; 156 } 157 #endif 158 159 icmp6len -= sizeof(*nd_rs); 160 nd6_option_init(nd_rs + 1, icmp6len, &ndopts); 161 if (nd6_options(&ndopts) < 0) { 162 nd6log((LOG_INFO, 163 "nd6_rs_input: invalid ND option, ignored\n")); 164 /* nd6_options have incremented stats */ 165 goto freeit; 166 } 167 168 if (ndopts.nd_opts_src_lladdr) { 169 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1); 170 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3; 171 } 172 173 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 174 nd6log((LOG_INFO, 175 "nd6_rs_input: lladdrlen mismatch for %s " 176 "(if %d, RS packet %d)\n", 177 ip6_sprintf(&saddr6), ifp->if_addrlen, lladdrlen - 2)); 178 goto bad; 179 } 180 181 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_SOLICIT, 0); 182 183 freeit: 184 m_freem(m); 185 return; 186 187 bad: 188 icmp6stat.icp6s_badrs++; 189 m_freem(m); 190 } 191 192 /* 193 * Receive Router Advertisement Message. 194 * 195 * Based on RFC 2461 196 * TODO: on-link bit on prefix information 197 * TODO: ND_RA_FLAG_{OTHER,MANAGED} processing 198 */ 199 void 200 nd6_ra_input(struct mbuf *m, int off, int icmp6len) 201 { 202 struct ifnet *ifp = m->m_pkthdr.rcvif; 203 struct nd_ifinfo *ndi = ND_IFINFO(ifp); 204 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 205 struct nd_router_advert *nd_ra; 206 struct in6_addr saddr6 = ip6->ip6_src; 207 #if 0 208 struct in6_addr daddr6 = ip6->ip6_dst; 209 int flags; /* = nd_ra->nd_ra_flags_reserved; */ 210 int is_managed = ((flags & ND_RA_FLAG_MANAGED) != 0); 211 int is_other = ((flags & ND_RA_FLAG_OTHER) != 0); 212 #endif 213 union nd_opts ndopts; 214 struct nd_defrouter *dr; 215 216 /* 217 * We only accept RAs only when 218 * the system-wide variable allows the acceptance, and 219 * per-interface variable allows RAs on the receiving interface. 220 */ 221 if (ip6_accept_rtadv == 0) 222 goto freeit; 223 if (!(ndi->flags & ND6_IFF_ACCEPT_RTADV)) 224 goto freeit; 225 226 if (ip6->ip6_hlim != 255) { 227 nd6log((LOG_ERR, 228 "nd6_ra_input: invalid hlim (%d) from %s to %s on %s\n", 229 ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src), 230 ip6_sprintf(&ip6->ip6_dst), if_name(ifp))); 231 goto bad; 232 } 233 234 if (!IN6_IS_ADDR_LINKLOCAL(&saddr6)) { 235 nd6log((LOG_ERR, 236 "nd6_ra_input: src %s is not link-local\n", 237 ip6_sprintf(&saddr6))); 238 goto bad; 239 } 240 241 #ifndef PULLDOWN_TEST 242 IP6_EXTHDR_CHECK(m, off, icmp6len,); 243 nd_ra = (struct nd_router_advert *)((caddr_t)ip6 + off); 244 #else 245 IP6_EXTHDR_GET(nd_ra, struct nd_router_advert *, m, off, icmp6len); 246 if (nd_ra == NULL) { 247 icmp6stat.icp6s_tooshort++; 248 return; 249 } 250 #endif 251 252 icmp6len -= sizeof(*nd_ra); 253 nd6_option_init(nd_ra + 1, icmp6len, &ndopts); 254 if (nd6_options(&ndopts) < 0) { 255 nd6log((LOG_INFO, 256 "nd6_ra_input: invalid ND option, ignored\n")); 257 /* nd6_options have incremented stats */ 258 goto freeit; 259 } 260 261 { 262 struct nd_defrouter dr0; 263 u_int32_t advreachable = nd_ra->nd_ra_reachable; 264 265 dr0.rtaddr = saddr6; 266 dr0.flags = nd_ra->nd_ra_flags_reserved; 267 dr0.rtlifetime = ntohs(nd_ra->nd_ra_router_lifetime); 268 dr0.expire = time_uptime + dr0.rtlifetime; 269 dr0.ifp = ifp; 270 dr0.advint = 0; /* Mobile IPv6 */ 271 dr0.advint_expire = 0; /* Mobile IPv6 */ 272 dr0.advints_lost = 0; /* Mobile IPv6 */ 273 /* unspecified or not? (RFC 2461 6.3.4) */ 274 if (advreachable) { 275 advreachable = ntohl(advreachable); 276 if (advreachable <= MAX_REACHABLE_TIME && 277 ndi->basereachable != advreachable) { 278 ndi->basereachable = advreachable; 279 ndi->reachable = ND_COMPUTE_RTIME(ndi->basereachable); 280 ndi->recalctm = nd6_recalc_reachtm_interval; /* reset */ 281 } 282 } 283 if (nd_ra->nd_ra_retransmit) 284 ndi->retrans = ntohl(nd_ra->nd_ra_retransmit); 285 if (nd_ra->nd_ra_curhoplimit) 286 ndi->chlim = nd_ra->nd_ra_curhoplimit; 287 dr = defrtrlist_update(&dr0); 288 } 289 290 /* 291 * prefix 292 */ 293 if (ndopts.nd_opts_pi) { 294 struct nd_opt_hdr *pt; 295 struct nd_opt_prefix_info *pi = NULL; 296 struct nd_prefix pr; 297 298 for (pt = (struct nd_opt_hdr *)ndopts.nd_opts_pi; 299 pt <= (struct nd_opt_hdr *)ndopts.nd_opts_pi_end; 300 pt = (struct nd_opt_hdr *)((caddr_t)pt + 301 (pt->nd_opt_len << 3))) { 302 if (pt->nd_opt_type != ND_OPT_PREFIX_INFORMATION) 303 continue; 304 pi = (struct nd_opt_prefix_info *)pt; 305 306 if (pi->nd_opt_pi_len != 4) { 307 nd6log((LOG_INFO, 308 "nd6_ra_input: invalid option " 309 "len %d for prefix information option, " 310 "ignored\n", pi->nd_opt_pi_len)); 311 continue; 312 } 313 314 if (128 < pi->nd_opt_pi_prefix_len) { 315 nd6log((LOG_INFO, 316 "nd6_ra_input: invalid prefix " 317 "len %d for prefix information option, " 318 "ignored\n", pi->nd_opt_pi_prefix_len)); 319 continue; 320 } 321 322 if (IN6_IS_ADDR_MULTICAST(&pi->nd_opt_pi_prefix) 323 || IN6_IS_ADDR_LINKLOCAL(&pi->nd_opt_pi_prefix)) { 324 nd6log((LOG_INFO, 325 "nd6_ra_input: invalid prefix " 326 "%s, ignored\n", 327 ip6_sprintf(&pi->nd_opt_pi_prefix))); 328 continue; 329 } 330 331 bzero(&pr, sizeof(pr)); 332 pr.ndpr_prefix.sin6_family = AF_INET6; 333 pr.ndpr_prefix.sin6_len = sizeof(pr.ndpr_prefix); 334 pr.ndpr_prefix.sin6_addr = pi->nd_opt_pi_prefix; 335 pr.ndpr_ifp = (struct ifnet *)m->m_pkthdr.rcvif; 336 337 pr.ndpr_raf_onlink = (pi->nd_opt_pi_flags_reserved & 338 ND_OPT_PI_FLAG_ONLINK) ? 1 : 0; 339 pr.ndpr_raf_auto = (pi->nd_opt_pi_flags_reserved & 340 ND_OPT_PI_FLAG_AUTO) ? 1 : 0; 341 pr.ndpr_plen = pi->nd_opt_pi_prefix_len; 342 pr.ndpr_vltime = ntohl(pi->nd_opt_pi_valid_time); 343 pr.ndpr_pltime = ntohl(pi->nd_opt_pi_preferred_time); 344 if (in6_init_prefix_ltimes(&pr)) 345 continue; /* prefix lifetime init failed */ 346 prelist_update(&pr, dr, m); 347 } 348 } 349 350 /* 351 * MTU 352 */ 353 if (ndopts.nd_opts_mtu && ndopts.nd_opts_mtu->nd_opt_mtu_len == 1) { 354 u_long mtu, maxmtu; 355 356 mtu = ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu); 357 358 /* lower bound */ 359 if (mtu < IPV6_MMTU) { 360 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu option " 361 "mtu=%ld sent from %s, ignoring\n", 362 mtu, ip6_sprintf(&ip6->ip6_src))); 363 goto skip; 364 } 365 366 /* upper bound */ 367 maxmtu = (ndi->maxmtu && ndi->maxmtu < ifp->if_mtu) ? 368 ndi->maxmtu : ifp->if_mtu; 369 if (mtu <= maxmtu) { 370 int change = (ndi->linkmtu != mtu); 371 372 ndi->linkmtu = mtu; 373 if (change) /* in6_maxmtu may change */ 374 in6_setmaxmtu(); 375 } else { 376 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu " 377 "mtu=%lu sent from %s; " 378 "exceeds maxmtu %lu, ignoring\n", 379 mtu, ip6_sprintf(&ip6->ip6_src), maxmtu)); 380 } 381 } 382 383 skip: 384 385 /* 386 * Source link layer address 387 */ 388 { 389 char *lladdr = NULL; 390 int lladdrlen = 0; 391 392 if (ndopts.nd_opts_src_lladdr) { 393 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1); 394 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3; 395 } 396 397 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 398 nd6log((LOG_INFO, 399 "nd6_ra_input: lladdrlen mismatch for %s " 400 "(if %d, RA packet %d)\n", 401 ip6_sprintf(&saddr6), ifp->if_addrlen, lladdrlen - 2)); 402 goto bad; 403 } 404 405 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_ADVERT, 0); 406 407 /* 408 * Installing a link-layer address might change the state of the 409 * router's neighbor cache, which might also affect our on-link 410 * detection of adveritsed prefixes. 411 */ 412 pfxlist_onlink_check(); 413 } 414 415 freeit: 416 m_freem(m); 417 return; 418 419 bad: 420 icmp6stat.icp6s_badra++; 421 m_freem(m); 422 } 423 424 /* 425 * default router list proccessing sub routines 426 */ 427 428 #if 0 429 /* tell the change to user processes watching the routing socket. */ 430 static void 431 nd6_rtmsg(int cmd, struct rtentry *rt) 432 { 433 struct rt_addrinfo info; 434 435 bzero((caddr_t)&info, sizeof(info)); 436 info.rti_info[RTAX_DST] = rt_key(rt); 437 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 438 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 439 if (TAILQ_EMPTY(&rt->rt_ifp->if_addrheads[mycpuid])) { 440 info.rti_info[RTAX_IFP] = NULL; 441 } else { 442 info.rti_info[RTAX_IFP] = 443 (struct sockaddr *) 444 TAILQ_FIRST(&rt->rt_ifp->if_addrheads[mycpuid])->ifa; 445 } 446 info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr; 447 448 rt_missmsg(cmd, &info, rt->rt_flags, 0); 449 } 450 #endif 451 452 void 453 defrouter_addreq(struct nd_defrouter *new) 454 { 455 struct sockaddr_in6 def, mask, gate; 456 457 bzero(&def, sizeof(def)); 458 bzero(&mask, sizeof(mask)); 459 bzero(&gate, sizeof(gate)); 460 461 def.sin6_len = mask.sin6_len = gate.sin6_len = 462 sizeof(struct sockaddr_in6); 463 def.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6; 464 gate.sin6_addr = new->rtaddr; 465 466 rtrequest_global(RTM_ADD, (struct sockaddr *)&def, 467 (struct sockaddr *)&gate, (struct sockaddr *)&mask, RTF_GATEWAY); 468 return; 469 } 470 471 /* Add a route to a given interface as default */ 472 static void 473 defrouter_addifreq(struct ifnet *ifp) 474 { 475 struct sockaddr_in6 def, mask; 476 struct ifaddr *ifa; 477 int error, flags; 478 479 bzero(&def, sizeof(def)); 480 bzero(&mask, sizeof(mask)); 481 482 def.sin6_len = mask.sin6_len = sizeof(struct sockaddr_in6); 483 def.sin6_family = mask.sin6_family = AF_INET6; 484 485 /* 486 * Search for an ifaddr beloging to the specified interface. 487 * XXX: An IPv6 address are required to be assigned on the interface. 488 */ 489 if ((ifa = ifaof_ifpforaddr((struct sockaddr *)&def, ifp)) == NULL) { 490 nd6log((LOG_ERR, /* better error? */ 491 "defrouter_addifreq: failed to find an ifaddr " 492 "to install a route to interface %s\n", 493 if_name(ifp))); 494 return; 495 } 496 497 flags = ifa->ifa_flags; 498 error = rtrequest_global(RTM_ADD, (struct sockaddr *)&def, 499 ifa->ifa_addr, (struct sockaddr *)&mask, flags); 500 if (error != 0) { 501 nd6log((LOG_ERR, 502 "defrouter_addifreq: failed to install a route to " 503 "interface %s (errno = %d)\n", 504 if_name(ifp), error)); 505 } 506 } 507 508 struct nd_defrouter * 509 defrouter_lookup(struct in6_addr *addr, struct ifnet *ifp) 510 { 511 struct nd_defrouter *dr; 512 513 for (dr = TAILQ_FIRST(&nd_defrouter); dr; 514 dr = TAILQ_NEXT(dr, dr_entry)) { 515 if (dr->ifp == ifp && IN6_ARE_ADDR_EQUAL(addr, &dr->rtaddr)) 516 return (dr); 517 } 518 519 return (NULL); /* search failed */ 520 } 521 522 void 523 defrouter_delreq(struct nd_defrouter *dr, int dofree) 524 { 525 struct sockaddr_in6 def, mask, gate; 526 527 bzero(&def, sizeof(def)); 528 bzero(&mask, sizeof(mask)); 529 bzero(&gate, sizeof(gate)); 530 531 def.sin6_len = mask.sin6_len = gate.sin6_len = 532 sizeof(struct sockaddr_in6); 533 def.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6; 534 gate.sin6_addr = dr->rtaddr; 535 536 rtrequest_global(RTM_DELETE, (struct sockaddr *)&def, 537 (struct sockaddr *)&gate, (struct sockaddr *)&mask, RTF_GATEWAY); 538 if (dofree) /* XXX: necessary? */ 539 kfree(dr, M_IP6NDP); 540 } 541 542 void 543 defrtrlist_del(struct nd_defrouter *dr) 544 { 545 struct nd_defrouter *deldr = NULL; 546 struct nd_prefix *pr; 547 548 /* 549 * Flush all the routing table entries that use the router 550 * as a next hop. 551 */ 552 if (!ip6_forwarding && ip6_accept_rtadv) /* XXX: better condition? */ 553 rt6_flush(&dr->rtaddr, dr->ifp); 554 555 if (dr == TAILQ_FIRST(&nd_defrouter)) 556 deldr = dr; /* The router is primary. */ 557 558 TAILQ_REMOVE(&nd_defrouter, dr, dr_entry); 559 560 /* 561 * Also delete all the pointers to the router in each prefix lists. 562 */ 563 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 564 struct nd_pfxrouter *pfxrtr; 565 if ((pfxrtr = pfxrtr_lookup(pr, dr)) != NULL) 566 pfxrtr_del(pfxrtr); 567 } 568 pfxlist_onlink_check(); 569 570 /* 571 * If the router is the primary one, choose a new one. 572 * Note that defrouter_select() will remove the current gateway 573 * from the routing table. 574 */ 575 if (deldr) 576 defrouter_select(); 577 578 kfree(dr, M_IP6NDP); 579 } 580 581 /* 582 * Default Router Selection according to Section 6.3.6 of RFC 2461: 583 * 1) Routers that are reachable or probably reachable should be 584 * preferred. 585 * 2) When no routers on the list are known to be reachable or 586 * probably reachable, routers SHOULD be selected in a round-robin 587 * fashion. 588 * 3) If the Default Router List is empty, assume that all 589 * destinations are on-link. 590 */ 591 void 592 defrouter_select(void) 593 { 594 struct nd_defrouter *dr, anydr; 595 struct rtentry *rt = NULL; 596 struct llinfo_nd6 *ln = NULL; 597 598 mtx_lock(&nd6_mtx); 599 600 /* 601 * Search for a (probably) reachable router from the list. 602 */ 603 for (dr = TAILQ_FIRST(&nd_defrouter); dr; 604 dr = TAILQ_NEXT(dr, dr_entry)) { 605 if ((rt = nd6_lookup(&dr->rtaddr, 0, dr->ifp)) && 606 (ln = (struct llinfo_nd6 *)rt->rt_llinfo) && 607 ND6_IS_LLINFO_PROBREACH(ln)) { 608 /* Got it, and move it to the head */ 609 TAILQ_REMOVE(&nd_defrouter, dr, dr_entry); 610 TAILQ_INSERT_HEAD(&nd_defrouter, dr, dr_entry); 611 break; 612 } 613 } 614 615 if ((dr = TAILQ_FIRST(&nd_defrouter))) { 616 /* 617 * De-install the previous default gateway and install 618 * a new one. 619 * Note that if there is no reachable router in the list, 620 * the head entry will be used anyway. 621 * XXX: do we have to check the current routing table entry? 622 */ 623 bzero(&anydr, sizeof(anydr)); 624 defrouter_delreq(&anydr, 0); 625 defrouter_addreq(dr); 626 } 627 else { 628 /* 629 * The Default Router List is empty, so install the default 630 * route to an inteface. 631 * XXX: The specification does not say this mechanism should 632 * be restricted to hosts, but this would be not useful 633 * (even harmful) for routers. 634 */ 635 if (!ip6_forwarding) { 636 /* 637 * De-install the current default route 638 * in advance. 639 */ 640 bzero(&anydr, sizeof(anydr)); 641 defrouter_delreq(&anydr, 0); 642 if (nd6_defifp) { 643 /* 644 * Install a route to the default interface 645 * as default route. 646 * XXX: we enable this for host only, because 647 * this may override a default route installed 648 * a user process (e.g. routing daemon) in a 649 * router case. 650 */ 651 defrouter_addifreq(nd6_defifp); 652 } else { 653 nd6log((LOG_INFO, "defrouter_select: " 654 "there's no default router and no default" 655 " interface\n")); 656 } 657 } 658 } 659 mtx_unlock(&nd6_mtx); 660 return; 661 } 662 663 static struct nd_defrouter * 664 defrtrlist_update(struct nd_defrouter *new) 665 { 666 struct nd_defrouter *dr, *n; 667 668 mtx_lock(&nd6_mtx); 669 670 if ((dr = defrouter_lookup(&new->rtaddr, new->ifp)) != NULL) { 671 /* entry exists */ 672 if (new->rtlifetime == 0) { 673 defrtrlist_del(dr); 674 dr = NULL; 675 } else { 676 /* override */ 677 dr->flags = new->flags; /* xxx flag check */ 678 dr->rtlifetime = new->rtlifetime; 679 dr->expire = new->expire; 680 } 681 mtx_unlock(&nd6_mtx); 682 return (dr); 683 } 684 685 /* entry does not exist */ 686 if (new->rtlifetime == 0) { 687 mtx_unlock(&nd6_mtx); 688 return (NULL); 689 } 690 691 n = (struct nd_defrouter *)kmalloc(sizeof(*n), M_IP6NDP, 692 M_NOWAIT | M_ZERO); 693 if (n == NULL) { 694 mtx_unlock(&nd6_mtx); 695 return (NULL); 696 } 697 *n = *new; 698 699 /* 700 * Insert the new router at the end of the Default Router List. 701 * If there is no other router, install it anyway. Otherwise, 702 * just continue to use the current default router. 703 */ 704 TAILQ_INSERT_TAIL(&nd_defrouter, n, dr_entry); 705 if (TAILQ_FIRST(&nd_defrouter) == n) 706 defrouter_select(); 707 mtx_unlock(&nd6_mtx); 708 return (n); 709 } 710 711 static struct nd_pfxrouter * 712 pfxrtr_lookup(struct nd_prefix *pr, struct nd_defrouter *dr) 713 { 714 struct nd_pfxrouter *search; 715 716 for (search = pr->ndpr_advrtrs.lh_first; search; search = search->pfr_next) { 717 if (search->router == dr) 718 break; 719 } 720 721 return (search); 722 } 723 724 static void 725 pfxrtr_add(struct nd_prefix *pr, struct nd_defrouter *dr) 726 { 727 struct nd_pfxrouter *new; 728 729 new = kmalloc(sizeof(*new), M_IP6NDP, M_INTWAIT | M_ZERO); 730 new->router = dr; 731 732 LIST_INSERT_HEAD(&pr->ndpr_advrtrs, new, pfr_entry); 733 734 pfxlist_onlink_check(); 735 } 736 737 static void 738 pfxrtr_del(struct nd_pfxrouter *pfr) 739 { 740 LIST_REMOVE(pfr, pfr_entry); 741 kfree(pfr, M_IP6NDP); 742 } 743 744 struct nd_prefix * 745 nd6_prefix_lookup(struct nd_prefix *pr) 746 { 747 struct nd_prefix *search; 748 749 for (search = nd_prefix.lh_first; search; search = search->ndpr_next) { 750 if (pr->ndpr_ifp == search->ndpr_ifp && 751 pr->ndpr_plen == search->ndpr_plen && 752 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr, 753 &search->ndpr_prefix.sin6_addr, pr->ndpr_plen)) 754 break; 755 } 756 757 return (search); 758 } 759 760 int 761 nd6_prelist_add(struct nd_prefix *pr, struct nd_defrouter *dr, 762 struct nd_prefix **newp) 763 { 764 struct nd_prefix *new = NULL; 765 int i; 766 767 new = kmalloc(sizeof(*new), M_IP6NDP, M_INTWAIT); 768 *new = *pr; 769 if (newp != NULL) 770 *newp = new; 771 772 /* initialization */ 773 LIST_INIT(&new->ndpr_advrtrs); 774 in6_prefixlen2mask(&new->ndpr_mask, new->ndpr_plen); 775 /* make prefix in the canonical form */ 776 for (i = 0; i < 4; i++) { 777 new->ndpr_prefix.sin6_addr.s6_addr32[i] &= 778 new->ndpr_mask.s6_addr32[i]; 779 } 780 781 mtx_lock(&nd6_mtx); 782 /* link ndpr_entry to nd_prefix list */ 783 LIST_INSERT_HEAD(&nd_prefix, new, ndpr_entry); 784 mtx_unlock(&nd6_mtx); 785 786 /* ND_OPT_PI_FLAG_ONLINK processing */ 787 if (new->ndpr_raf_onlink) { 788 int e; 789 790 if ((e = nd6_prefix_onlink(new)) != 0) { 791 nd6log((LOG_ERR, "nd6_prelist_add: failed to make " 792 "the prefix %s/%d on-link on %s (errno=%d)\n", 793 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 794 pr->ndpr_plen, if_name(pr->ndpr_ifp), e)); 795 /* proceed anyway. XXX: is it correct? */ 796 } 797 } 798 799 if (dr) 800 pfxrtr_add(new, dr); 801 802 return 0; 803 } 804 805 void 806 prelist_remove(struct nd_prefix *pr) 807 { 808 struct nd_pfxrouter *pfr, *next; 809 int e; 810 811 /* make sure to invalidate the prefix until it is really freed. */ 812 pr->ndpr_vltime = 0; 813 pr->ndpr_pltime = 0; 814 #if 0 815 /* 816 * Though these flags are now meaningless, we'd rather keep the value 817 * not to confuse users when executing "ndp -p". 818 */ 819 pr->ndpr_raf_onlink = 0; 820 pr->ndpr_raf_auto = 0; 821 #endif 822 if ((pr->ndpr_stateflags & NDPRF_ONLINK) && 823 (e = nd6_prefix_offlink(pr)) != 0) { 824 nd6log((LOG_ERR, "prelist_remove: failed to make %s/%d offlink " 825 "on %s, errno=%d\n", 826 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 827 pr->ndpr_plen, if_name(pr->ndpr_ifp), e)); 828 /* what should we do? */ 829 } 830 831 if (pr->ndpr_refcnt > 0) 832 return; /* notice here? */ 833 834 mtx_lock(&nd6_mtx); 835 836 /* unlink ndpr_entry from nd_prefix list */ 837 LIST_REMOVE(pr, ndpr_entry); 838 839 /* free list of routers that adversed the prefix */ 840 for (pfr = pr->ndpr_advrtrs.lh_first; pfr; pfr = next) { 841 next = pfr->pfr_next; 842 843 kfree(pfr, M_IP6NDP); 844 } 845 mtx_unlock(&nd6_mtx); 846 847 kfree(pr, M_IP6NDP); 848 849 pfxlist_onlink_check(); 850 } 851 852 /* 853 * Parameters: 854 * dr: may be NULL 855 */ 856 int 857 prelist_update(struct nd_prefix *new, struct nd_defrouter *dr, struct mbuf *m) 858 { 859 struct in6_ifaddr *ia6 = NULL, *ia6_match = NULL; 860 struct ifaddr_container *ifac; 861 struct ifnet *ifp = new->ndpr_ifp; 862 struct nd_prefix *pr; 863 int error = 0; 864 int auth; 865 struct in6_addrlifetime lt6_tmp; 866 867 auth = 0; 868 mtx_lock(&nd6_mtx); 869 if (m) { 870 /* 871 * Authenticity for NA consists authentication for 872 * both IP header and IP datagrams, doesn't it ? 873 */ 874 #if defined(M_AUTHIPHDR) && defined(M_AUTHIPDGM) 875 auth = ((m->m_flags & M_AUTHIPHDR) && 876 (m->m_flags & M_AUTHIPDGM)); 877 #endif 878 } 879 880 if ((pr = nd6_prefix_lookup(new)) != NULL) { 881 /* 882 * nd6_prefix_lookup() ensures that pr and new have the same 883 * prefix on a same interface. 884 */ 885 886 /* 887 * Update prefix information. Note that the on-link (L) bit 888 * and the autonomous (A) bit should NOT be changed from 1 889 * to 0. 890 */ 891 if (new->ndpr_raf_onlink == 1) 892 pr->ndpr_raf_onlink = 1; 893 if (new->ndpr_raf_auto == 1) 894 pr->ndpr_raf_auto = 1; 895 if (new->ndpr_raf_onlink) { 896 pr->ndpr_vltime = new->ndpr_vltime; 897 pr->ndpr_pltime = new->ndpr_pltime; 898 pr->ndpr_preferred = new->ndpr_preferred; 899 pr->ndpr_expire = new->ndpr_expire; 900 } 901 902 if (new->ndpr_raf_onlink && 903 !(pr->ndpr_stateflags & NDPRF_ONLINK)) { 904 int e; 905 906 if ((e = nd6_prefix_onlink(pr)) != 0) { 907 nd6log((LOG_ERR, 908 "prelist_update: failed to make " 909 "the prefix %s/%d on-link on %s " 910 "(errno=%d)\n", 911 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 912 pr->ndpr_plen, if_name(pr->ndpr_ifp), e)); 913 /* proceed anyway. XXX: is it correct? */ 914 } 915 } 916 917 if (dr && pfxrtr_lookup(pr, dr) == NULL) 918 pfxrtr_add(pr, dr); 919 } else { 920 struct nd_prefix *newpr = NULL; 921 922 if (new->ndpr_vltime == 0) 923 goto end; 924 if (new->ndpr_raf_onlink == 0 && new->ndpr_raf_auto == 0) 925 goto end; 926 927 bzero(&new->ndpr_addr, sizeof(struct in6_addr)); 928 929 error = nd6_prelist_add(new, dr, &newpr); 930 if (error != 0 || newpr == NULL) { 931 nd6log((LOG_NOTICE, "prelist_update: " 932 "nd6_prelist_add failed for %s/%d on %s " 933 "errno=%d, returnpr=%p\n", 934 ip6_sprintf(&new->ndpr_prefix.sin6_addr), 935 new->ndpr_plen, if_name(new->ndpr_ifp), 936 error, newpr)); 937 goto end; /* we should just give up in this case. */ 938 } 939 940 /* 941 * XXX: from the ND point of view, we can ignore a prefix 942 * with the on-link bit being zero. However, we need a 943 * prefix structure for references from autoconfigured 944 * addresses. Thus, we explicitly make sure that the prefix 945 * itself expires now. 946 */ 947 if (newpr->ndpr_raf_onlink == 0) { 948 newpr->ndpr_vltime = 0; 949 newpr->ndpr_pltime = 0; 950 in6_init_prefix_ltimes(newpr); 951 } 952 953 pr = newpr; 954 } 955 956 /* 957 * Address autoconfiguration based on Section 5.5.3 of RFC 2462. 958 * Note that pr must be non NULL at this point. 959 */ 960 961 /* 5.5.3 (a). Ignore the prefix without the A bit set. */ 962 if (!new->ndpr_raf_auto) 963 goto afteraddrconf; 964 965 /* 966 * 5.5.3 (b). the link-local prefix should have been ignored in 967 * nd6_ra_input. 968 */ 969 970 /* 971 * 5.5.3 (c). Consistency check on lifetimes: pltime <= vltime. 972 * This should have been done in nd6_ra_input. 973 */ 974 975 /* 976 * 5.5.3 (d). If the prefix advertised does not match the prefix of an 977 * address already in the list, and the Valid Lifetime is not 0, 978 * form an address. Note that even a manually configured address 979 * should reject autoconfiguration of a new address. 980 */ 981 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 982 struct ifaddr *ifa = ifac->ifa; 983 struct in6_ifaddr *ifa6; 984 int ifa_plen; 985 u_int32_t storedlifetime; 986 987 if (ifa->ifa_addr->sa_family != AF_INET6) 988 continue; 989 990 ifa6 = (struct in6_ifaddr *)ifa; 991 992 /* 993 * Spec is not clear here, but I believe we should concentrate 994 * on unicast (i.e. not anycast) addresses. 995 * XXX: other ia6_flags? detached or duplicated? 996 */ 997 if (ifa6->ia6_flags & IN6_IFF_ANYCAST) 998 continue; 999 1000 ifa_plen = in6_mask2len(&ifa6->ia_prefixmask.sin6_addr, NULL); 1001 if (ifa_plen != new->ndpr_plen || 1002 !in6_are_prefix_equal(&ifa6->ia_addr.sin6_addr, 1003 &new->ndpr_prefix.sin6_addr, ifa_plen)) 1004 continue; 1005 1006 if (ia6_match == NULL) /* remember the first one */ 1007 ia6_match = ifa6; 1008 1009 if (!(ifa6->ia6_flags & IN6_IFF_AUTOCONF)) 1010 continue; 1011 1012 /* 1013 * An already autoconfigured address matched. Now that we 1014 * are sure there is at least one matched address, we can 1015 * proceed to 5.5.3. (e): update the lifetimes according to the 1016 * "two hours" rule and the privacy extension. 1017 */ 1018 #define TWOHOUR (120*60) 1019 lt6_tmp = ifa6->ia6_lifetime; 1020 1021 if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME) 1022 storedlifetime = ND6_INFINITE_LIFETIME; 1023 else if (IFA6_IS_INVALID(ifa6)) 1024 storedlifetime = 0; 1025 else 1026 storedlifetime = lt6_tmp.ia6t_expire - time_uptime; 1027 1028 /* when not updating, keep the current stored lifetime. */ 1029 lt6_tmp.ia6t_vltime = storedlifetime; 1030 1031 if (TWOHOUR < new->ndpr_vltime || 1032 storedlifetime < new->ndpr_vltime) { 1033 lt6_tmp.ia6t_vltime = new->ndpr_vltime; 1034 } else if (storedlifetime <= TWOHOUR 1035 #if 0 1036 /* 1037 * This condition is logically redundant, so we just 1038 * omit it. 1039 * See IPng 6712, 6717, and 6721. 1040 */ 1041 && new->ndpr_vltime <= storedlifetime 1042 #endif 1043 ) { 1044 if (auth) { 1045 lt6_tmp.ia6t_vltime = new->ndpr_vltime; 1046 } 1047 } else { 1048 /* 1049 * new->ndpr_vltime <= TWOHOUR && 1050 * TWOHOUR < storedlifetime 1051 */ 1052 lt6_tmp.ia6t_vltime = TWOHOUR; 1053 } 1054 1055 /* The 2 hour rule is not imposed for preferred lifetime. */ 1056 lt6_tmp.ia6t_pltime = new->ndpr_pltime; 1057 1058 in6_init_address_ltimes(pr, <6_tmp); 1059 1060 /* 1061 * When adjusting the lifetimes of an existing temporary 1062 * address, only lower the lifetimes. 1063 * RFC 3041 3.3. (1). 1064 * XXX: how should we modify ia6t_[pv]ltime? 1065 */ 1066 if (ifa6->ia6_flags & IN6_IFF_TEMPORARY) { 1067 if (lt6_tmp.ia6t_expire == 0 || /* no expire */ 1068 lt6_tmp.ia6t_expire > 1069 ifa6->ia6_lifetime.ia6t_expire) { 1070 lt6_tmp.ia6t_expire = 1071 ifa6->ia6_lifetime.ia6t_expire; 1072 } 1073 if (lt6_tmp.ia6t_preferred == 0 || /* no expire */ 1074 lt6_tmp.ia6t_preferred > 1075 ifa6->ia6_lifetime.ia6t_preferred) { 1076 lt6_tmp.ia6t_preferred = 1077 ifa6->ia6_lifetime.ia6t_preferred; 1078 } 1079 } 1080 1081 ifa6->ia6_lifetime = lt6_tmp; 1082 } 1083 if (ia6_match == NULL && new->ndpr_vltime) { 1084 /* 1085 * No address matched and the valid lifetime is non-zero. 1086 * Create a new address. 1087 */ 1088 if ((ia6 = in6_ifadd(new, NULL)) != NULL) { 1089 /* 1090 * note that we should use pr (not new) for reference. 1091 */ 1092 pr->ndpr_refcnt++; 1093 ia6->ia6_ndpr = pr; 1094 1095 /* 1096 * RFC 3041 3.3 (2). 1097 * When a new public address is created as described 1098 * in RFC2462, also create a new temporary address. 1099 * 1100 * RFC 3041 3.5. 1101 * When an interface connects to a new link, a new 1102 * randomized interface identifier should be generated 1103 * immediately together with a new set of temporary 1104 * addresses. Thus, we specifiy 1 as the 2nd arg of 1105 * in6_tmpifadd(). 1106 */ 1107 if (ip6_use_tempaddr) { 1108 int e; 1109 if ((e = in6_tmpifadd(ia6, 1)) != 0) { 1110 nd6log((LOG_NOTICE, "prelist_update: " 1111 "failed to create a temporary " 1112 "address, errno=%d\n", 1113 e)); 1114 } 1115 } 1116 1117 /* 1118 * A newly added address might affect the status 1119 * of other addresses, so we check and update it. 1120 * XXX: what if address duplication happens? 1121 */ 1122 pfxlist_onlink_check(); 1123 } else { 1124 /* just set an error. do not bark here. */ 1125 error = EADDRNOTAVAIL; /* XXX: might be unused. */ 1126 } 1127 } 1128 1129 afteraddrconf: 1130 1131 end: 1132 mtx_unlock(&nd6_mtx); 1133 return error; 1134 } 1135 1136 /* 1137 * A supplement function used in the on-link detection below; 1138 * detect if a given prefix has a (probably) reachable advertising router. 1139 * XXX: lengthy function name... 1140 */ 1141 static struct nd_pfxrouter * 1142 find_pfxlist_reachable_router(struct nd_prefix *pr) 1143 { 1144 struct nd_pfxrouter *pfxrtr; 1145 struct rtentry *rt; 1146 struct llinfo_nd6 *ln; 1147 1148 for (pfxrtr = LIST_FIRST(&pr->ndpr_advrtrs); pfxrtr; 1149 pfxrtr = LIST_NEXT(pfxrtr, pfr_entry)) { 1150 if ((rt = nd6_lookup(&pfxrtr->router->rtaddr, 0, 1151 pfxrtr->router->ifp)) && 1152 (ln = (struct llinfo_nd6 *)rt->rt_llinfo) && 1153 ND6_IS_LLINFO_PROBREACH(ln)) 1154 break; /* found */ 1155 } 1156 1157 return (pfxrtr); 1158 } 1159 1160 /* 1161 * Check if each prefix in the prefix list has at least one available router 1162 * that advertised the prefix (a router is "available" if its neighbor cache 1163 * entry is reachable or probably reachable). 1164 * If the check fails, the prefix may be off-link, because, for example, 1165 * we have moved from the network but the lifetime of the prefix has not 1166 * expired yet. So we should not use the prefix if there is another prefix 1167 * that has an available router. 1168 * But, if there is no prefix that has an available router, we still regards 1169 * all the prefixes as on-link. This is because we can't tell if all the 1170 * routers are simply dead or if we really moved from the network and there 1171 * is no router around us. 1172 */ 1173 void 1174 pfxlist_onlink_check(void) 1175 { 1176 struct nd_prefix *pr; 1177 struct in6_ifaddr *ifa; 1178 1179 /* 1180 * Check if there is a prefix that has a reachable advertising 1181 * router. 1182 */ 1183 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 1184 if (pr->ndpr_raf_onlink && find_pfxlist_reachable_router(pr)) 1185 break; 1186 } 1187 1188 if (pr) { 1189 /* 1190 * There is at least one prefix that has a reachable router. 1191 * Detach prefixes which have no reachable advertising 1192 * router, and attach other prefixes. 1193 */ 1194 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 1195 /* XXX: a link-local prefix should never be detached */ 1196 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr)) 1197 continue; 1198 1199 /* 1200 * we aren't interested in prefixes without the L bit 1201 * set. 1202 */ 1203 if (pr->ndpr_raf_onlink == 0) 1204 continue; 1205 1206 if (!(pr->ndpr_stateflags & NDPRF_DETACHED) && 1207 find_pfxlist_reachable_router(pr) == NULL) 1208 pr->ndpr_stateflags |= NDPRF_DETACHED; 1209 if ((pr->ndpr_stateflags & NDPRF_DETACHED) && 1210 find_pfxlist_reachable_router(pr) != NULL) 1211 pr->ndpr_stateflags &= ~NDPRF_DETACHED; 1212 } 1213 } else { 1214 /* there is no prefix that has a reachable router */ 1215 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 1216 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr)) 1217 continue; 1218 1219 if (pr->ndpr_raf_onlink == 0) 1220 continue; 1221 1222 if (pr->ndpr_stateflags & NDPRF_DETACHED) 1223 pr->ndpr_stateflags &= ~NDPRF_DETACHED; 1224 } 1225 } 1226 1227 /* 1228 * Remove each interface route associated with a (just) detached 1229 * prefix, and reinstall the interface route for a (just) attached 1230 * prefix. Note that all attempt of reinstallation does not 1231 * necessarily success, when a same prefix is shared among multiple 1232 * interfaces. Such cases will be handled in nd6_prefix_onlink, 1233 * so we don't have to care about them. 1234 */ 1235 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 1236 int e; 1237 1238 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr)) 1239 continue; 1240 1241 if (pr->ndpr_raf_onlink == 0) 1242 continue; 1243 1244 if ((pr->ndpr_stateflags & NDPRF_DETACHED) && 1245 (pr->ndpr_stateflags & NDPRF_ONLINK)) { 1246 if ((e = nd6_prefix_offlink(pr)) != 0) { 1247 nd6log((LOG_ERR, 1248 "pfxlist_onlink_check: failed to " 1249 "make %s/%d offlink, errno=%d\n", 1250 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 1251 pr->ndpr_plen, e)); 1252 } 1253 } 1254 if (!(pr->ndpr_stateflags & NDPRF_DETACHED) && 1255 !(pr->ndpr_stateflags & NDPRF_ONLINK) && 1256 pr->ndpr_raf_onlink) { 1257 if ((e = nd6_prefix_onlink(pr)) != 0) { 1258 nd6log((LOG_ERR, 1259 "pfxlist_onlink_check: failed to " 1260 "make %s/%d offlink, errno=%d\n", 1261 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 1262 pr->ndpr_plen, e)); 1263 } 1264 } 1265 } 1266 1267 /* 1268 * Changes on the prefix status might affect address status as well. 1269 * Make sure that all addresses derived from an attached prefix are 1270 * attached, and that all addresses derived from a detached prefix are 1271 * detached. Note, however, that a manually configured address should 1272 * always be attached. 1273 * The precise detection logic is same as the one for prefixes. 1274 */ 1275 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) { 1276 if (!(ifa->ia6_flags & IN6_IFF_AUTOCONF)) 1277 continue; 1278 1279 if (ifa->ia6_ndpr == NULL) { 1280 /* 1281 * This can happen when we first configure the address 1282 * (i.e. the address exists, but the prefix does not). 1283 * XXX: complicated relationships... 1284 */ 1285 continue; 1286 } 1287 1288 if (find_pfxlist_reachable_router(ifa->ia6_ndpr)) 1289 break; 1290 } 1291 if (ifa) { 1292 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) { 1293 if (!(ifa->ia6_flags & IN6_IFF_AUTOCONF)) 1294 continue; 1295 1296 if (ifa->ia6_ndpr == NULL) /* XXX: see above. */ 1297 continue; 1298 1299 if (find_pfxlist_reachable_router(ifa->ia6_ndpr)) { 1300 if (ifa->ia6_flags & IN6_IFF_DETACHED) { 1301 ifa->ia6_flags &= ~IN6_IFF_DETACHED; 1302 ifa->ia6_flags |= IN6_IFF_TENTATIVE; 1303 nd6_dad_start((struct ifaddr *)ifa, 0); 1304 } 1305 } else { 1306 if ((ifa->ia6_flags & IN6_IFF_DETACHED) == 0) { 1307 ifa->ia6_flags |= IN6_IFF_DETACHED; 1308 in6_newaddrmsg((struct ifaddr *)ifa); 1309 } 1310 } 1311 } 1312 } 1313 else { 1314 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) { 1315 if (!(ifa->ia6_flags & IN6_IFF_AUTOCONF)) 1316 continue; 1317 1318 ifa->ia6_flags &= ~IN6_IFF_DETACHED; 1319 ifa->ia6_flags |= IN6_IFF_TENTATIVE; 1320 nd6_dad_start((struct ifaddr *)ifa, 0); 1321 } 1322 } 1323 } 1324 1325 int 1326 nd6_prefix_onlink(struct nd_prefix *pr) 1327 { 1328 struct ifaddr *ifa; 1329 struct ifnet *ifp = pr->ndpr_ifp; 1330 struct sockaddr_in6 mask6; 1331 struct nd_prefix *opr; 1332 u_long rtflags; 1333 int error = 0; 1334 1335 /* sanity check */ 1336 if (pr->ndpr_stateflags & NDPRF_ONLINK) { 1337 nd6log((LOG_ERR, 1338 "nd6_prefix_onlink: %s/%d is already on-link\n", 1339 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen); 1340 return (EEXIST)); 1341 } 1342 1343 /* 1344 * Add the interface route associated with the prefix. Before 1345 * installing the route, check if there's the same prefix on another 1346 * interface, and the prefix has already installed the interface route. 1347 * Although such a configuration is expected to be rare, we explicitly 1348 * allow it. 1349 */ 1350 for (opr = nd_prefix.lh_first; opr; opr = opr->ndpr_next) { 1351 if (opr == pr) 1352 continue; 1353 1354 if (!(opr->ndpr_stateflags & NDPRF_ONLINK)) 1355 continue; 1356 1357 if (opr->ndpr_plen == pr->ndpr_plen && 1358 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr, 1359 &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen)) 1360 return (0); 1361 } 1362 1363 /* 1364 * We prefer link-local addresses as the associated interface address. 1365 */ 1366 /* search for a link-local addr */ 1367 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 1368 IN6_IFF_NOTREADY| IN6_IFF_ANYCAST); 1369 if (ifa == NULL) { 1370 struct ifaddr_container *ifac; 1371 1372 /* XXX: freebsd does not have ifa_ifwithaf */ 1373 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1374 if (ifac->ifa->ifa_addr->sa_family == AF_INET6) { 1375 ifa = ifac->ifa; 1376 break; 1377 } 1378 } 1379 /* should we care about ia6_flags? */ 1380 } 1381 if (ifa == NULL) { 1382 /* 1383 * This can still happen, when, for example, we receive an RA 1384 * containing a prefix with the L bit set and the A bit clear, 1385 * after removing all IPv6 addresses on the receiving 1386 * interface. This should, of course, be rare though. 1387 */ 1388 nd6log((LOG_NOTICE, 1389 "nd6_prefix_onlink: failed to find any ifaddr" 1390 " to add route for a prefix(%s/%d) on %s\n", 1391 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 1392 pr->ndpr_plen, if_name(ifp))); 1393 return (0); 1394 } 1395 1396 /* 1397 * in6_ifinit() sets nd6_rtrequest to ifa_rtrequest for all ifaddrs. 1398 * ifa->ifa_rtrequest = nd6_rtrequest; 1399 */ 1400 bzero(&mask6, sizeof(mask6)); 1401 mask6.sin6_len = sizeof(mask6); 1402 mask6.sin6_addr = pr->ndpr_mask; 1403 rtflags = ifa->ifa_flags | RTF_CLONING | RTF_UP; 1404 if (nd6_need_cache(ifp)) { 1405 /* explicitly set in case ifa_flags does not set the flag. */ 1406 rtflags |= RTF_CLONING; 1407 } else { 1408 /* 1409 * explicitly clear the cloning bit in case ifa_flags sets it. 1410 */ 1411 rtflags &= ~RTF_CLONING; 1412 } 1413 error = rtrequest_global(RTM_ADD, (struct sockaddr *)&pr->ndpr_prefix, 1414 ifa->ifa_addr, (struct sockaddr *)&mask6, rtflags); 1415 if (error == 0) { 1416 pr->ndpr_stateflags |= NDPRF_ONLINK; 1417 } else { 1418 nd6log((LOG_ERR, "nd6_prefix_onlink: failed to add route for a" 1419 " prefix (%s/%d) on %s, gw=%s, mask=%s, flags=%lx " 1420 "errno = %d\n", 1421 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 1422 pr->ndpr_plen, if_name(ifp), 1423 ip6_sprintf(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr), 1424 ip6_sprintf(&mask6.sin6_addr), rtflags, error)); 1425 } 1426 return (error); 1427 } 1428 1429 int 1430 nd6_prefix_offlink(struct nd_prefix *pr) 1431 { 1432 int error = 0; 1433 struct ifnet *ifp = pr->ndpr_ifp; 1434 struct nd_prefix *opr; 1435 struct sockaddr_in6 sa6, mask6; 1436 1437 /* sanity check */ 1438 if (!(pr->ndpr_stateflags & NDPRF_ONLINK)) { 1439 nd6log((LOG_ERR, 1440 "nd6_prefix_offlink: %s/%d is already off-link\n", 1441 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen)); 1442 return (EEXIST); 1443 } 1444 1445 bzero(&sa6, sizeof(sa6)); 1446 sa6.sin6_family = AF_INET6; 1447 sa6.sin6_len = sizeof(sa6); 1448 bcopy(&pr->ndpr_prefix.sin6_addr, &sa6.sin6_addr, 1449 sizeof(struct in6_addr)); 1450 bzero(&mask6, sizeof(mask6)); 1451 mask6.sin6_family = AF_INET6; 1452 mask6.sin6_len = sizeof(sa6); 1453 bcopy(&pr->ndpr_mask, &mask6.sin6_addr, sizeof(struct in6_addr)); 1454 error = rtrequest_global(RTM_DELETE, (struct sockaddr *)&sa6, NULL, 1455 (struct sockaddr *)&mask6, 0); 1456 if (error == 0) { 1457 pr->ndpr_stateflags &= ~NDPRF_ONLINK; 1458 1459 /* 1460 * There might be the same prefix on another interface, 1461 * the prefix which could not be on-link just because we have 1462 * the interface route (see comments in nd6_prefix_onlink). 1463 * If there's one, try to make the prefix on-link on the 1464 * interface. 1465 */ 1466 for (opr = nd_prefix.lh_first; opr; opr = opr->ndpr_next) { 1467 if (opr == pr) 1468 continue; 1469 1470 if (opr->ndpr_stateflags & NDPRF_ONLINK) 1471 continue; 1472 1473 /* 1474 * KAME specific: detached prefixes should not be 1475 * on-link. 1476 */ 1477 if (opr->ndpr_stateflags & NDPRF_DETACHED) 1478 continue; 1479 1480 if (opr->ndpr_plen == pr->ndpr_plen && 1481 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr, 1482 &opr->ndpr_prefix.sin6_addr, pr->ndpr_plen)) { 1483 int e; 1484 1485 if ((e = nd6_prefix_onlink(opr)) != 0) { 1486 nd6log((LOG_ERR, 1487 "nd6_prefix_offlink: failed to " 1488 "recover a prefix %s/%d from %s " 1489 "to %s (errno = %d)\n", 1490 ip6_sprintf(&opr->ndpr_prefix.sin6_addr), 1491 opr->ndpr_plen, if_name(ifp), 1492 if_name(opr->ndpr_ifp), e)); 1493 } 1494 } 1495 } 1496 } else { 1497 /* XXX: can we still set the NDPRF_ONLINK flag? */ 1498 nd6log((LOG_ERR, 1499 "nd6_prefix_offlink: failed to delete route: " 1500 "%s/%d on %s (errno = %d)\n", 1501 ip6_sprintf(&sa6.sin6_addr), pr->ndpr_plen, if_name(ifp), 1502 error)); 1503 } 1504 1505 return (error); 1506 } 1507 1508 /* 1509 * Parameters: 1510 * ifid: Mobile IPv6 addition 1511 */ 1512 static struct in6_ifaddr * 1513 in6_ifadd(struct nd_prefix *pr, struct in6_addr *ifid) 1514 { 1515 struct ifnet *ifp = pr->ndpr_ifp; 1516 struct ifaddr *ifa; 1517 struct in6_aliasreq ifra; 1518 struct in6_ifaddr *ia, *ib; 1519 int error, plen0; 1520 struct in6_addr mask; 1521 int prefixlen = pr->ndpr_plen; 1522 1523 in6_prefixlen2mask(&mask, prefixlen); 1524 1525 /* 1526 * find a link-local address (will be interface ID). 1527 * Is it really mandatory? Theoretically, a global or a site-local 1528 * address can be configured without a link-local address, if we 1529 * have a unique interface identifier... 1530 * 1531 * it is not mandatory to have a link-local address, we can generate 1532 * interface identifier on the fly. we do this because: 1533 * (1) it should be the easiest way to find interface identifier. 1534 * (2) RFC2462 5.4 suggesting the use of the same interface identifier 1535 * for multiple addresses on a single interface, and possible shortcut 1536 * of DAD. we omitted DAD for this reason in the past. 1537 * (3) a user can prevent autoconfiguration of global address 1538 * by removing link-local address by hand (this is partly because we 1539 * don't have other way to control the use of IPv6 on a interface. 1540 * this has been our design choice - cf. NRL's "ifconfig auto"). 1541 * (4) it is easier to manage when an interface has addresses 1542 * with the same interface identifier, than to have multiple addresses 1543 * with different interface identifiers. 1544 * 1545 * Mobile IPv6 addition: allow for caller to specify a wished interface 1546 * ID. This is to not break connections when moving addresses between 1547 * interfaces. 1548 */ 1549 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0); /* 0 is OK? */ 1550 if (ifa) 1551 ib = (struct in6_ifaddr *)ifa; 1552 else 1553 return NULL; 1554 1555 #if 0 /* don't care link local addr state, and always do DAD */ 1556 /* if link-local address is not eligible, do not autoconfigure. */ 1557 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) { 1558 kprintf("in6_ifadd: link-local address not ready\n"); 1559 return NULL; 1560 } 1561 #endif 1562 1563 /* prefixlen + ifidlen must be equal to 128 */ 1564 plen0 = in6_mask2len(&ib->ia_prefixmask.sin6_addr, NULL); 1565 if (prefixlen != plen0) { 1566 nd6log((LOG_INFO, "in6_ifadd: wrong prefixlen for %s " 1567 "(prefix=%d ifid=%d)\n", 1568 if_name(ifp), prefixlen, 128 - plen0)); 1569 return NULL; 1570 } 1571 1572 /* make ifaddr */ 1573 1574 bzero(&ifra, sizeof(ifra)); 1575 /* 1576 * in6_update_ifa() does not use ifra_name, but we accurately set it 1577 * for safety. 1578 */ 1579 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 1580 ifra.ifra_addr.sin6_family = AF_INET6; 1581 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 1582 /* prefix */ 1583 bcopy(&pr->ndpr_prefix.sin6_addr, &ifra.ifra_addr.sin6_addr, 1584 sizeof(ifra.ifra_addr.sin6_addr)); 1585 ifra.ifra_addr.sin6_addr.s6_addr32[0] &= mask.s6_addr32[0]; 1586 ifra.ifra_addr.sin6_addr.s6_addr32[1] &= mask.s6_addr32[1]; 1587 ifra.ifra_addr.sin6_addr.s6_addr32[2] &= mask.s6_addr32[2]; 1588 ifra.ifra_addr.sin6_addr.s6_addr32[3] &= mask.s6_addr32[3]; 1589 1590 /* interface ID */ 1591 if (ifid == NULL || IN6_IS_ADDR_UNSPECIFIED(ifid)) 1592 ifid = &ib->ia_addr.sin6_addr; 1593 ifra.ifra_addr.sin6_addr.s6_addr32[0] |= 1594 (ifid->s6_addr32[0] & ~mask.s6_addr32[0]); 1595 ifra.ifra_addr.sin6_addr.s6_addr32[1] |= 1596 (ifid->s6_addr32[1] & ~mask.s6_addr32[1]); 1597 ifra.ifra_addr.sin6_addr.s6_addr32[2] |= 1598 (ifid->s6_addr32[2] & ~mask.s6_addr32[2]); 1599 ifra.ifra_addr.sin6_addr.s6_addr32[3] |= 1600 (ifid->s6_addr32[3] & ~mask.s6_addr32[3]); 1601 1602 /* new prefix mask. */ 1603 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 1604 ifra.ifra_prefixmask.sin6_family = AF_INET6; 1605 bcopy(&mask, &ifra.ifra_prefixmask.sin6_addr, 1606 sizeof(ifra.ifra_prefixmask.sin6_addr)); 1607 1608 /* 1609 * lifetime. 1610 * XXX: in6_init_address_ltimes would override these values later. 1611 * We should reconsider this logic. 1612 */ 1613 ifra.ifra_lifetime.ia6t_vltime = pr->ndpr_vltime; 1614 ifra.ifra_lifetime.ia6t_pltime = pr->ndpr_pltime; 1615 1616 /* XXX: scope zone ID? */ 1617 1618 ifra.ifra_flags |= IN6_IFF_AUTOCONF; /* obey autoconf */ 1619 /* 1620 * temporarily set the nopfx flag to avoid conflict. 1621 * XXX: we should reconsider the entire mechanism about prefix 1622 * manipulation. 1623 */ 1624 ifra.ifra_flags |= IN6_IFF_NOPFX; 1625 1626 /* 1627 * keep the new address, regardless of the result of in6_update_ifa. 1628 * XXX: this address is now meaningless. 1629 * We should reconsider its role. 1630 */ 1631 pr->ndpr_addr = ifra.ifra_addr.sin6_addr; 1632 1633 /* allocate ifaddr structure, link into chain, etc. */ 1634 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) { 1635 nd6log((LOG_ERR, 1636 "in6_ifadd: failed to make ifaddr %s on %s (errno=%d)\n", 1637 ip6_sprintf(&ifra.ifra_addr.sin6_addr), if_name(ifp), 1638 error)); 1639 return (NULL); /* ifaddr must not have been allocated. */ 1640 } 1641 1642 ia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr); 1643 1644 return (ia); /* this is always non-NULL */ 1645 } 1646 1647 /* 1648 * Parameters: 1649 * ia0: corresponding public address 1650 */ 1651 int 1652 in6_tmpifadd(const struct in6_ifaddr *ia0, int forcegen) 1653 { 1654 struct ifnet *ifp = ia0->ia_ifa.ifa_ifp; 1655 struct in6_ifaddr *newia; 1656 struct in6_aliasreq ifra; 1657 int i, error; 1658 int trylimit = 3; /* XXX: adhoc value */ 1659 u_int32_t randid[2]; 1660 time_t vltime0, pltime0; 1661 1662 bzero(&ifra, sizeof(ifra)); 1663 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 1664 ifra.ifra_addr = ia0->ia_addr; 1665 /* copy prefix mask */ 1666 ifra.ifra_prefixmask = ia0->ia_prefixmask; 1667 /* clear the old IFID */ 1668 for (i = 0; i < 4; i++) { 1669 ifra.ifra_addr.sin6_addr.s6_addr32[i] &= 1670 ifra.ifra_prefixmask.sin6_addr.s6_addr32[i]; 1671 } 1672 1673 again: 1674 in6_get_tmpifid(ifp, (u_int8_t *)randid, 1675 (const u_int8_t *)&ia0->ia_addr.sin6_addr.s6_addr[8], forcegen); 1676 ifra.ifra_addr.sin6_addr.s6_addr32[2] |= 1677 (randid[0] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[2])); 1678 ifra.ifra_addr.sin6_addr.s6_addr32[3] |= 1679 (randid[1] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[3])); 1680 1681 /* 1682 * If by chance the new temporary address is the same as an address 1683 * already assigned to the interface, generate a new randomized 1684 * interface identifier and repeat this step. 1685 * RFC 3041 3.3 (4). 1686 */ 1687 if (in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr) != NULL) { 1688 if (trylimit-- == 0) { 1689 nd6log((LOG_NOTICE, "in6_tmpifadd: failed to find " 1690 "a unique random IFID\n")); 1691 return (EEXIST); 1692 } 1693 forcegen = 1; 1694 goto again; 1695 } 1696 1697 /* 1698 * The Valid Lifetime is the lower of the Valid Lifetime of the 1699 * public address or TEMP_VALID_LIFETIME. 1700 * The Preferred Lifetime is the lower of the Preferred Lifetime 1701 * of the public address or TEMP_PREFERRED_LIFETIME - 1702 * DESYNC_FACTOR. 1703 */ 1704 if (ia0->ia6_lifetime.ia6t_expire != 0) { 1705 vltime0 = IFA6_IS_INVALID(ia0) ? 1706 0 : (ia0->ia6_lifetime.ia6t_expire - time_uptime); 1707 if (vltime0 > ip6_temp_valid_lifetime) 1708 vltime0 = ip6_temp_valid_lifetime; 1709 } else 1710 vltime0 = ip6_temp_valid_lifetime; 1711 if (ia0->ia6_lifetime.ia6t_preferred != 0) { 1712 pltime0 = IFA6_IS_DEPRECATED(ia0) ? 1713 0 : (ia0->ia6_lifetime.ia6t_preferred - time_uptime); 1714 if (pltime0 > ip6_temp_preferred_lifetime - ip6_desync_factor) { 1715 pltime0 = ip6_temp_preferred_lifetime - 1716 ip6_desync_factor; 1717 } 1718 } else 1719 pltime0 = ip6_temp_preferred_lifetime - ip6_desync_factor; 1720 ifra.ifra_lifetime.ia6t_vltime = vltime0; 1721 ifra.ifra_lifetime.ia6t_pltime = pltime0; 1722 1723 /* 1724 * A temporary address is created only if this calculated Preferred 1725 * Lifetime is greater than REGEN_ADVANCE time units. 1726 */ 1727 if (ifra.ifra_lifetime.ia6t_pltime <= ip6_temp_regen_advance) 1728 return (0); 1729 1730 /* XXX: scope zone ID? */ 1731 1732 ifra.ifra_flags |= (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY); 1733 1734 /* allocate ifaddr structure, link into chain, etc. */ 1735 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) 1736 return (error); 1737 1738 newia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr); 1739 if (newia == NULL) { /* XXX: can it happen? */ 1740 nd6log((LOG_ERR, 1741 "in6_tmpifadd: ifa update succeeded, but we got " 1742 "no ifaddr\n")); 1743 return (EINVAL); /* XXX */ 1744 } 1745 newia->ia6_ndpr = ia0->ia6_ndpr; 1746 newia->ia6_ndpr->ndpr_refcnt++; 1747 1748 return (0); 1749 } 1750 1751 int 1752 in6_init_prefix_ltimes(struct nd_prefix *ndpr) 1753 { 1754 /* check if preferred lifetime > valid lifetime. RFC2462 5.5.3 (c) */ 1755 if (ndpr->ndpr_pltime > ndpr->ndpr_vltime) { 1756 nd6log((LOG_INFO, "in6_init_prefix_ltimes: preferred lifetime" 1757 "(%d) is greater than valid lifetime(%d)\n", 1758 (u_int)ndpr->ndpr_pltime, (u_int)ndpr->ndpr_vltime)); 1759 return (EINVAL); 1760 } 1761 if (ndpr->ndpr_pltime == ND6_INFINITE_LIFETIME) 1762 ndpr->ndpr_preferred = 0; 1763 else 1764 ndpr->ndpr_preferred = time_uptime + ndpr->ndpr_pltime; 1765 if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME) 1766 ndpr->ndpr_expire = 0; 1767 else 1768 ndpr->ndpr_expire = time_uptime + ndpr->ndpr_vltime; 1769 1770 return 0; 1771 } 1772 1773 static void 1774 in6_init_address_ltimes(struct nd_prefix *new, struct in6_addrlifetime *lt6) 1775 { 1776 /* init ia6t_expire */ 1777 if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME) 1778 lt6->ia6t_expire = 0; 1779 else { 1780 lt6->ia6t_expire = time_uptime; 1781 lt6->ia6t_expire += lt6->ia6t_vltime; 1782 } 1783 1784 /* init ia6t_preferred */ 1785 if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME) 1786 lt6->ia6t_preferred = 0; 1787 else { 1788 lt6->ia6t_preferred = time_uptime; 1789 lt6->ia6t_preferred += lt6->ia6t_pltime; 1790 } 1791 } 1792 1793 /* 1794 * Delete all the routing table entries that use the specified gateway. 1795 * 1796 * XXX: this function causes search through all entries of routing table, so 1797 * it shouldn't be called when acting as a router. 1798 */ 1799 void 1800 rt6_flush(struct in6_addr *gateway, struct ifnet *ifp) 1801 { 1802 struct radix_node_head *rnh = rt_tables[mycpuid][AF_INET6]; 1803 1804 /* We'll care only link-local addresses */ 1805 if (!IN6_IS_ADDR_LINKLOCAL(gateway)) 1806 return; 1807 /* XXX: hack for KAME's link-local address kludge */ 1808 gateway->s6_addr16[1] = htons(ifp->if_index); 1809 1810 rnh->rnh_walktree(rnh, rt6_deleteroute, (void *)gateway); 1811 } 1812 1813 static int 1814 rt6_deleteroute(struct radix_node *rn, void *arg) 1815 { 1816 #define SIN6(s) ((struct sockaddr_in6 *)s) 1817 struct rtentry *rt = (struct rtentry *)rn; 1818 struct in6_addr *gate = (struct in6_addr *)arg; 1819 1820 if (rt->rt_gateway == NULL || rt->rt_gateway->sa_family != AF_INET6) 1821 return (0); 1822 1823 if (!IN6_ARE_ADDR_EQUAL(gate, &SIN6(rt->rt_gateway)->sin6_addr)) 1824 return (0); 1825 1826 /* 1827 * Do not delete a static route. 1828 * XXX: this seems to be a bit ad-hoc. Should we consider the 1829 * 'cloned' bit instead? 1830 */ 1831 if (rt->rt_flags & RTF_STATIC) 1832 return (0); 1833 1834 /* 1835 * We delete only host route. This means, in particular, we don't 1836 * delete default route. 1837 */ 1838 if (!(rt->rt_flags & RTF_HOST)) 1839 return (0); 1840 1841 return (rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway, rt_mask(rt), 1842 rt->rt_flags, 0)); 1843 #undef SIN6 1844 } 1845 1846 int 1847 nd6_setdefaultiface(int ifindex) 1848 { 1849 int error = 0; 1850 1851 if (ifindex < 0 || if_index < ifindex) 1852 return (EINVAL); 1853 1854 if (nd6_defifindex != ifindex) { 1855 nd6_defifindex = ifindex; 1856 if (nd6_defifindex > 0) 1857 nd6_defifp = ifindex2ifnet[nd6_defifindex]; 1858 else 1859 nd6_defifp = NULL; 1860 1861 /* 1862 * If the Default Router List is empty, install a route 1863 * to the specified interface as default or remove the default 1864 * route when the default interface becomes canceled. 1865 * The check for the queue is actually redundant, but 1866 * we do this here to avoid re-install the default route 1867 * if the list is NOT empty. 1868 */ 1869 if (TAILQ_FIRST(&nd_defrouter) == NULL) 1870 defrouter_select(); 1871 1872 /* 1873 * Our current implementation assumes one-to-one maping between 1874 * interfaces and links, so it would be natural to use the 1875 * default interface as the default link. 1876 */ 1877 scope6_setdefault(nd6_defifp); 1878 } 1879 1880 return (error); 1881 } 1882