1 /* $FreeBSD: src/sys/netinet6/nd6_rtr.c,v 1.2.2.5 2003/04/05 10:28:53 ume Exp $ */ 2 /* $DragonFly: src/sys/netinet6/nd6_rtr.c,v 1.3 2003/08/23 11:02:45 rob Exp $ */ 3 /* $KAME: nd6_rtr.c,v 1.111 2001/04/27 01:37:15 jinmei Exp $ */ 4 5 /* 6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the project nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include "opt_inet.h" 35 #include "opt_inet6.h" 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/malloc.h> 40 #include <sys/mbuf.h> 41 #include <sys/socket.h> 42 #include <sys/sockio.h> 43 #include <sys/time.h> 44 #include <sys/kernel.h> 45 #include <sys/errno.h> 46 #include <sys/syslog.h> 47 #include <sys/queue.h> 48 49 #include <net/if.h> 50 #include <net/if_types.h> 51 #include <net/if_dl.h> 52 #include <net/route.h> 53 #include <net/radix.h> 54 55 #include <netinet/in.h> 56 #include <netinet6/in6_var.h> 57 #include <netinet6/in6_ifattach.h> 58 #include <netinet/ip6.h> 59 #include <netinet6/ip6_var.h> 60 #include <netinet6/nd6.h> 61 #include <netinet/icmp6.h> 62 #include <netinet6/scope6_var.h> 63 64 #include <net/net_osdep.h> 65 66 #define SDL(s) ((struct sockaddr_dl *)s) 67 68 static struct nd_defrouter *defrtrlist_update (struct nd_defrouter *); 69 static struct in6_ifaddr *in6_ifadd (struct nd_prefix *, 70 struct in6_addr *); 71 static struct nd_pfxrouter *pfxrtr_lookup (struct nd_prefix *, 72 struct nd_defrouter *); 73 static void pfxrtr_add (struct nd_prefix *, struct nd_defrouter *); 74 static void pfxrtr_del (struct nd_pfxrouter *); 75 static struct nd_pfxrouter *find_pfxlist_reachable_router 76 (struct nd_prefix *); 77 static void defrouter_addifreq (struct ifnet *); 78 static void nd6_rtmsg (int, struct rtentry *); 79 80 static void in6_init_address_ltimes (struct nd_prefix *ndpr, 81 struct in6_addrlifetime *lt6); 82 83 static int rt6_deleteroute (struct radix_node *, void *); 84 85 extern int nd6_recalc_reachtm_interval; 86 87 static struct ifnet *nd6_defifp; 88 int nd6_defifindex; 89 90 int ip6_use_tempaddr = 0; 91 92 int ip6_desync_factor; 93 u_int32_t ip6_temp_preferred_lifetime = DEF_TEMP_PREFERRED_LIFETIME; 94 u_int32_t ip6_temp_valid_lifetime = DEF_TEMP_VALID_LIFETIME; 95 /* 96 * shorter lifetimes for debugging purposes. 97 int ip6_temp_preferred_lifetime = 800; 98 static int ip6_temp_valid_lifetime = 1800; 99 */ 100 int ip6_temp_regen_advance = TEMPADDR_REGEN_ADVANCE; 101 102 /* 103 * Receive Router Solicitation Message - just for routers. 104 * Router solicitation/advertisement is mostly managed by userland program 105 * (rtadvd) so here we have no function like nd6_ra_output(). 106 * 107 * Based on RFC 2461 108 */ 109 void 110 nd6_rs_input(m, off, icmp6len) 111 struct mbuf *m; 112 int off, 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 #if 0 119 struct in6_addr daddr6 = ip6->ip6_dst; 120 #endif 121 char *lladdr = NULL; 122 int lladdrlen = 0; 123 #if 0 124 struct sockaddr_dl *sdl = (struct sockaddr_dl *)NULL; 125 struct llinfo_nd6 *ln = (struct llinfo_nd6 *)NULL; 126 struct rtentry *rt = NULL; 127 int is_newentry; 128 #endif 129 union nd_opts ndopts; 130 131 /* If I'm not a router, ignore it. */ 132 if (ip6_accept_rtadv != 0 || ip6_forwarding != 1) 133 goto freeit; 134 135 /* Sanity checks */ 136 if (ip6->ip6_hlim != 255) { 137 nd6log((LOG_ERR, 138 "nd6_rs_input: invalid hlim (%d) from %s to %s on %s\n", 139 ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src), 140 ip6_sprintf(&ip6->ip6_dst), if_name(ifp))); 141 goto bad; 142 } 143 144 /* 145 * Don't update the neighbor cache, if src = ::. 146 * This indicates that the src has no IP address assigned yet. 147 */ 148 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) 149 goto freeit; 150 151 #ifndef PULLDOWN_TEST 152 IP6_EXTHDR_CHECK(m, off, icmp6len,); 153 nd_rs = (struct nd_router_solicit *)((caddr_t)ip6 + off); 154 #else 155 IP6_EXTHDR_GET(nd_rs, struct nd_router_solicit *, m, off, icmp6len); 156 if (nd_rs == NULL) { 157 icmp6stat.icp6s_tooshort++; 158 return; 159 } 160 #endif 161 162 icmp6len -= sizeof(*nd_rs); 163 nd6_option_init(nd_rs + 1, icmp6len, &ndopts); 164 if (nd6_options(&ndopts) < 0) { 165 nd6log((LOG_INFO, 166 "nd6_rs_input: invalid ND option, ignored\n")); 167 /* nd6_options have incremented stats */ 168 goto freeit; 169 } 170 171 if (ndopts.nd_opts_src_lladdr) { 172 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1); 173 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3; 174 } 175 176 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 177 nd6log((LOG_INFO, 178 "nd6_rs_input: lladdrlen mismatch for %s " 179 "(if %d, RS packet %d)\n", 180 ip6_sprintf(&saddr6), ifp->if_addrlen, lladdrlen - 2)); 181 goto bad; 182 } 183 184 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_SOLICIT, 0); 185 186 freeit: 187 m_freem(m); 188 return; 189 190 bad: 191 icmp6stat.icp6s_badrs++; 192 m_freem(m); 193 } 194 195 /* 196 * Receive Router Advertisement Message. 197 * 198 * Based on RFC 2461 199 * TODO: on-link bit on prefix information 200 * TODO: ND_RA_FLAG_{OTHER,MANAGED} processing 201 */ 202 void 203 nd6_ra_input(m, off, icmp6len) 204 struct mbuf *m; 205 int off, icmp6len; 206 { 207 struct ifnet *ifp = m->m_pkthdr.rcvif; 208 struct nd_ifinfo *ndi = &nd_ifinfo[ifp->if_index]; 209 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 210 struct nd_router_advert *nd_ra; 211 struct in6_addr saddr6 = ip6->ip6_src; 212 #if 0 213 struct in6_addr daddr6 = ip6->ip6_dst; 214 int flags; /* = nd_ra->nd_ra_flags_reserved; */ 215 int is_managed = ((flags & ND_RA_FLAG_MANAGED) != 0); 216 int is_other = ((flags & ND_RA_FLAG_OTHER) != 0); 217 #endif 218 union nd_opts ndopts; 219 struct nd_defrouter *dr; 220 221 if (ip6_accept_rtadv == 0) 222 goto freeit; 223 224 if (ip6->ip6_hlim != 255) { 225 nd6log((LOG_ERR, 226 "nd6_ra_input: invalid hlim (%d) from %s to %s on %s\n", 227 ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src), 228 ip6_sprintf(&ip6->ip6_dst), if_name(ifp))); 229 goto bad; 230 } 231 232 if (!IN6_IS_ADDR_LINKLOCAL(&saddr6)) { 233 nd6log((LOG_ERR, 234 "nd6_ra_input: src %s is not link-local\n", 235 ip6_sprintf(&saddr6))); 236 goto bad; 237 } 238 239 #ifndef PULLDOWN_TEST 240 IP6_EXTHDR_CHECK(m, off, icmp6len,); 241 nd_ra = (struct nd_router_advert *)((caddr_t)ip6 + off); 242 #else 243 IP6_EXTHDR_GET(nd_ra, struct nd_router_advert *, m, off, icmp6len); 244 if (nd_ra == NULL) { 245 icmp6stat.icp6s_tooshort++; 246 return; 247 } 248 #endif 249 250 icmp6len -= sizeof(*nd_ra); 251 nd6_option_init(nd_ra + 1, icmp6len, &ndopts); 252 if (nd6_options(&ndopts) < 0) { 253 nd6log((LOG_INFO, 254 "nd6_ra_input: invalid ND option, ignored\n")); 255 /* nd6_options have incremented stats */ 256 goto freeit; 257 } 258 259 { 260 struct nd_defrouter dr0; 261 u_int32_t advreachable = nd_ra->nd_ra_reachable; 262 263 dr0.rtaddr = saddr6; 264 dr0.flags = nd_ra->nd_ra_flags_reserved; 265 dr0.rtlifetime = ntohs(nd_ra->nd_ra_router_lifetime); 266 dr0.expire = time_second + dr0.rtlifetime; 267 dr0.ifp = ifp; 268 dr0.advint = 0; /* Mobile IPv6 */ 269 dr0.advint_expire = 0; /* Mobile IPv6 */ 270 dr0.advints_lost = 0; /* Mobile IPv6 */ 271 /* unspecified or not? (RFC 2461 6.3.4) */ 272 if (advreachable) { 273 NTOHL(advreachable); 274 if (advreachable <= MAX_REACHABLE_TIME && 275 ndi->basereachable != advreachable) { 276 ndi->basereachable = advreachable; 277 ndi->reachable = ND_COMPUTE_RTIME(ndi->basereachable); 278 ndi->recalctm = nd6_recalc_reachtm_interval; /* reset */ 279 } 280 } 281 if (nd_ra->nd_ra_retransmit) 282 ndi->retrans = ntohl(nd_ra->nd_ra_retransmit); 283 if (nd_ra->nd_ra_curhoplimit) 284 ndi->chlim = nd_ra->nd_ra_curhoplimit; 285 dr = defrtrlist_update(&dr0); 286 } 287 288 /* 289 * prefix 290 */ 291 if (ndopts.nd_opts_pi) { 292 struct nd_opt_hdr *pt; 293 struct nd_opt_prefix_info *pi = NULL; 294 struct nd_prefix pr; 295 296 for (pt = (struct nd_opt_hdr *)ndopts.nd_opts_pi; 297 pt <= (struct nd_opt_hdr *)ndopts.nd_opts_pi_end; 298 pt = (struct nd_opt_hdr *)((caddr_t)pt + 299 (pt->nd_opt_len << 3))) { 300 if (pt->nd_opt_type != ND_OPT_PREFIX_INFORMATION) 301 continue; 302 pi = (struct nd_opt_prefix_info *)pt; 303 304 if (pi->nd_opt_pi_len != 4) { 305 nd6log((LOG_INFO, 306 "nd6_ra_input: invalid option " 307 "len %d for prefix information option, " 308 "ignored\n", pi->nd_opt_pi_len)); 309 continue; 310 } 311 312 if (128 < pi->nd_opt_pi_prefix_len) { 313 nd6log((LOG_INFO, 314 "nd6_ra_input: invalid prefix " 315 "len %d for prefix information option, " 316 "ignored\n", pi->nd_opt_pi_prefix_len)); 317 continue; 318 } 319 320 if (IN6_IS_ADDR_MULTICAST(&pi->nd_opt_pi_prefix) 321 || IN6_IS_ADDR_LINKLOCAL(&pi->nd_opt_pi_prefix)) { 322 nd6log((LOG_INFO, 323 "nd6_ra_input: invalid prefix " 324 "%s, ignored\n", 325 ip6_sprintf(&pi->nd_opt_pi_prefix))); 326 continue; 327 } 328 329 /* aggregatable unicast address, rfc2374 */ 330 if ((pi->nd_opt_pi_prefix.s6_addr8[0] & 0xe0) == 0x20 331 && pi->nd_opt_pi_prefix_len != 64) { 332 nd6log((LOG_INFO, 333 "nd6_ra_input: invalid prefixlen " 334 "%d for rfc2374 prefix %s, ignored\n", 335 pi->nd_opt_pi_prefix_len, 336 ip6_sprintf(&pi->nd_opt_pi_prefix))); 337 continue; 338 } 339 340 bzero(&pr, sizeof(pr)); 341 pr.ndpr_prefix.sin6_family = AF_INET6; 342 pr.ndpr_prefix.sin6_len = sizeof(pr.ndpr_prefix); 343 pr.ndpr_prefix.sin6_addr = pi->nd_opt_pi_prefix; 344 pr.ndpr_ifp = (struct ifnet *)m->m_pkthdr.rcvif; 345 346 pr.ndpr_raf_onlink = (pi->nd_opt_pi_flags_reserved & 347 ND_OPT_PI_FLAG_ONLINK) ? 1 : 0; 348 pr.ndpr_raf_auto = (pi->nd_opt_pi_flags_reserved & 349 ND_OPT_PI_FLAG_AUTO) ? 1 : 0; 350 pr.ndpr_plen = pi->nd_opt_pi_prefix_len; 351 pr.ndpr_vltime = ntohl(pi->nd_opt_pi_valid_time); 352 pr.ndpr_pltime = 353 ntohl(pi->nd_opt_pi_preferred_time); 354 355 if (in6_init_prefix_ltimes(&pr)) 356 continue; /* prefix lifetime init failed */ 357 358 (void)prelist_update(&pr, dr, m); 359 } 360 } 361 362 /* 363 * MTU 364 */ 365 if (ndopts.nd_opts_mtu && ndopts.nd_opts_mtu->nd_opt_mtu_len == 1) { 366 u_int32_t mtu = ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu); 367 368 /* lower bound */ 369 if (mtu < IPV6_MMTU) { 370 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu option " 371 "mtu=%d sent from %s, ignoring\n", 372 mtu, ip6_sprintf(&ip6->ip6_src))); 373 goto skip; 374 } 375 376 /* upper bound */ 377 if (ndi->maxmtu) { 378 if (mtu <= ndi->maxmtu) { 379 int change = (ndi->linkmtu != mtu); 380 381 ndi->linkmtu = mtu; 382 if (change) /* in6_maxmtu may change */ 383 in6_setmaxmtu(); 384 } else { 385 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu " 386 "mtu=%d sent from %s; " 387 "exceeds maxmtu %d, ignoring\n", 388 mtu, ip6_sprintf(&ip6->ip6_src), 389 ndi->maxmtu)); 390 } 391 } else { 392 nd6log((LOG_INFO, "nd6_ra_input: mtu option " 393 "mtu=%d sent from %s; maxmtu unknown, " 394 "ignoring\n", 395 mtu, ip6_sprintf(&ip6->ip6_src))); 396 } 397 } 398 399 skip: 400 401 /* 402 * Source link layer address 403 */ 404 { 405 char *lladdr = NULL; 406 int lladdrlen = 0; 407 408 if (ndopts.nd_opts_src_lladdr) { 409 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1); 410 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3; 411 } 412 413 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 414 nd6log((LOG_INFO, 415 "nd6_ra_input: lladdrlen mismatch for %s " 416 "(if %d, RA packet %d)\n", 417 ip6_sprintf(&saddr6), ifp->if_addrlen, lladdrlen - 2)); 418 goto bad; 419 } 420 421 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_ADVERT, 0); 422 423 /* 424 * Installing a link-layer address might change the state of the 425 * router's neighbor cache, which might also affect our on-link 426 * detection of adveritsed prefixes. 427 */ 428 pfxlist_onlink_check(); 429 } 430 431 freeit: 432 m_freem(m); 433 return; 434 435 bad: 436 icmp6stat.icp6s_badra++; 437 m_freem(m); 438 } 439 440 /* 441 * default router list proccessing sub routines 442 */ 443 444 /* tell the change to user processes watching the routing socket. */ 445 static void 446 nd6_rtmsg(cmd, rt) 447 int cmd; 448 struct rtentry *rt; 449 { 450 struct rt_addrinfo info; 451 452 bzero((caddr_t)&info, sizeof(info)); 453 info.rti_info[RTAX_DST] = rt_key(rt); 454 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 455 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 456 info.rti_info[RTAX_IFP] = 457 (struct sockaddr *)TAILQ_FIRST(&rt->rt_ifp->if_addrlist); 458 info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr; 459 460 rt_missmsg(cmd, &info, rt->rt_flags, 0); 461 } 462 463 void 464 defrouter_addreq(new) 465 struct nd_defrouter *new; 466 { 467 struct sockaddr_in6 def, mask, gate; 468 struct rtentry *newrt = NULL; 469 int s; 470 471 Bzero(&def, sizeof(def)); 472 Bzero(&mask, sizeof(mask)); 473 Bzero(&gate, sizeof(gate)); 474 475 def.sin6_len = mask.sin6_len = gate.sin6_len 476 = sizeof(struct sockaddr_in6); 477 def.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6; 478 gate.sin6_addr = new->rtaddr; 479 480 s = splnet(); 481 (void)rtrequest(RTM_ADD, (struct sockaddr *)&def, 482 (struct sockaddr *)&gate, (struct sockaddr *)&mask, 483 RTF_GATEWAY, &newrt); 484 if (newrt) { 485 nd6_rtmsg(RTM_ADD, newrt); /* tell user process */ 486 newrt->rt_refcnt--; 487 } 488 splx(s); 489 return; 490 } 491 492 /* Add a route to a given interface as default */ 493 void 494 defrouter_addifreq(ifp) 495 struct ifnet *ifp; 496 { 497 struct sockaddr_in6 def, mask; 498 struct ifaddr *ifa; 499 struct rtentry *newrt = NULL; 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(RTM_ADD, (struct sockaddr *)&def, ifa->ifa_addr, 522 (struct sockaddr *)&mask, flags, &newrt); 523 if (error != 0) { 524 nd6log((LOG_ERR, 525 "defrouter_addifreq: failed to install a route to " 526 "interface %s (errno = %d)\n", 527 if_name(ifp), error)); 528 529 if (newrt) /* maybe unnecessary, but do it for safety */ 530 newrt->rt_refcnt--; 531 } else { 532 if (newrt) { 533 nd6_rtmsg(RTM_ADD, newrt); 534 newrt->rt_refcnt--; 535 } 536 } 537 } 538 539 struct nd_defrouter * 540 defrouter_lookup(addr, ifp) 541 struct in6_addr *addr; 542 struct ifnet *ifp; 543 { 544 struct nd_defrouter *dr; 545 546 for (dr = TAILQ_FIRST(&nd_defrouter); dr; 547 dr = TAILQ_NEXT(dr, dr_entry)) { 548 if (dr->ifp == ifp && IN6_ARE_ADDR_EQUAL(addr, &dr->rtaddr)) 549 return(dr); 550 } 551 552 return(NULL); /* search failed */ 553 } 554 555 void 556 defrouter_delreq(dr, dofree) 557 struct nd_defrouter *dr; 558 int dofree; 559 { 560 struct sockaddr_in6 def, mask, gate; 561 struct rtentry *oldrt = NULL; 562 563 Bzero(&def, sizeof(def)); 564 Bzero(&mask, sizeof(mask)); 565 Bzero(&gate, sizeof(gate)); 566 567 def.sin6_len = mask.sin6_len = gate.sin6_len 568 = sizeof(struct sockaddr_in6); 569 def.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6; 570 gate.sin6_addr = dr->rtaddr; 571 572 rtrequest(RTM_DELETE, (struct sockaddr *)&def, 573 (struct sockaddr *)&gate, 574 (struct sockaddr *)&mask, 575 RTF_GATEWAY, &oldrt); 576 if (oldrt) { 577 nd6_rtmsg(RTM_DELETE, oldrt); 578 if (oldrt->rt_refcnt <= 0) { 579 /* 580 * XXX: borrowed from the RTM_DELETE case of 581 * rtrequest(). 582 */ 583 oldrt->rt_refcnt++; 584 rtfree(oldrt); 585 } 586 } 587 588 if (dofree) /* XXX: necessary? */ 589 free(dr, M_IP6NDP); 590 } 591 592 void 593 defrtrlist_del(dr) 594 struct nd_defrouter *dr; 595 { 596 struct nd_defrouter *deldr = NULL; 597 struct nd_prefix *pr; 598 599 /* 600 * Flush all the routing table entries that use the router 601 * as a next hop. 602 */ 603 if (!ip6_forwarding && ip6_accept_rtadv) { 604 /* above is a good condition? */ 605 rt6_flush(&dr->rtaddr, dr->ifp); 606 } 607 608 if (dr == TAILQ_FIRST(&nd_defrouter)) 609 deldr = dr; /* The router is primary. */ 610 611 TAILQ_REMOVE(&nd_defrouter, dr, dr_entry); 612 613 /* 614 * Also delete all the pointers to the router in each prefix lists. 615 */ 616 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 617 struct nd_pfxrouter *pfxrtr; 618 if ((pfxrtr = pfxrtr_lookup(pr, dr)) != NULL) 619 pfxrtr_del(pfxrtr); 620 } 621 pfxlist_onlink_check(); 622 623 /* 624 * If the router is the primary one, choose a new one. 625 * Note that defrouter_select() will remove the current gateway 626 * from the routing table. 627 */ 628 if (deldr) 629 defrouter_select(); 630 631 free(dr, M_IP6NDP); 632 } 633 634 /* 635 * Default Router Selection according to Section 6.3.6 of RFC 2461: 636 * 1) Routers that are reachable or probably reachable should be 637 * preferred. 638 * 2) When no routers on the list are known to be reachable or 639 * probably reachable, routers SHOULD be selected in a round-robin 640 * fashion. 641 * 3) If the Default Router List is empty, assume that all 642 * destinations are on-link. 643 */ 644 void 645 defrouter_select() 646 { 647 int s = splnet(); 648 struct nd_defrouter *dr, anydr; 649 struct rtentry *rt = NULL; 650 struct llinfo_nd6 *ln = NULL; 651 652 /* 653 * Search for a (probably) reachable router from the list. 654 */ 655 for (dr = TAILQ_FIRST(&nd_defrouter); dr; 656 dr = TAILQ_NEXT(dr, dr_entry)) { 657 if ((rt = nd6_lookup(&dr->rtaddr, 0, dr->ifp)) && 658 (ln = (struct llinfo_nd6 *)rt->rt_llinfo) && 659 ND6_IS_LLINFO_PROBREACH(ln)) { 660 /* Got it, and move it to the head */ 661 TAILQ_REMOVE(&nd_defrouter, dr, dr_entry); 662 TAILQ_INSERT_HEAD(&nd_defrouter, dr, dr_entry); 663 break; 664 } 665 } 666 667 if ((dr = TAILQ_FIRST(&nd_defrouter))) { 668 /* 669 * De-install the previous default gateway and install 670 * a new one. 671 * Note that if there is no reachable router in the list, 672 * the head entry will be used anyway. 673 * XXX: do we have to check the current routing table entry? 674 */ 675 bzero(&anydr, sizeof(anydr)); 676 defrouter_delreq(&anydr, 0); 677 defrouter_addreq(dr); 678 } 679 else { 680 /* 681 * The Default Router List is empty, so install the default 682 * route to an inteface. 683 * XXX: The specification does not say this mechanism should 684 * be restricted to hosts, but this would be not useful 685 * (even harmful) for routers. 686 */ 687 if (!ip6_forwarding) { 688 /* 689 * De-install the current default route 690 * in advance. 691 */ 692 bzero(&anydr, sizeof(anydr)); 693 defrouter_delreq(&anydr, 0); 694 if (nd6_defifp) { 695 /* 696 * Install a route to the default interface 697 * as default route. 698 * XXX: we enable this for host only, because 699 * this may override a default route installed 700 * a user process (e.g. routing daemon) in a 701 * router case. 702 */ 703 defrouter_addifreq(nd6_defifp); 704 } else { 705 nd6log((LOG_INFO, "defrouter_select: " 706 "there's no default router and no default" 707 " interface\n")); 708 } 709 } 710 } 711 712 splx(s); 713 return; 714 } 715 716 static struct nd_defrouter * 717 defrtrlist_update(new) 718 struct nd_defrouter *new; 719 { 720 struct nd_defrouter *dr, *n; 721 int s = splnet(); 722 723 if ((dr = defrouter_lookup(&new->rtaddr, new->ifp)) != NULL) { 724 /* entry exists */ 725 if (new->rtlifetime == 0) { 726 defrtrlist_del(dr); 727 dr = NULL; 728 } else { 729 /* override */ 730 dr->flags = new->flags; /* xxx flag check */ 731 dr->rtlifetime = new->rtlifetime; 732 dr->expire = new->expire; 733 } 734 splx(s); 735 return(dr); 736 } 737 738 /* entry does not exist */ 739 if (new->rtlifetime == 0) { 740 splx(s); 741 return(NULL); 742 } 743 744 n = (struct nd_defrouter *)malloc(sizeof(*n), M_IP6NDP, M_NOWAIT); 745 if (n == NULL) { 746 splx(s); 747 return(NULL); 748 } 749 bzero(n, sizeof(*n)); 750 *n = *new; 751 752 /* 753 * Insert the new router at the end of the Default Router List. 754 * If there is no other router, install it anyway. Otherwise, 755 * just continue to use the current default router. 756 */ 757 TAILQ_INSERT_TAIL(&nd_defrouter, n, dr_entry); 758 if (TAILQ_FIRST(&nd_defrouter) == n) 759 defrouter_select(); 760 splx(s); 761 762 return(n); 763 } 764 765 static struct nd_pfxrouter * 766 pfxrtr_lookup(pr, dr) 767 struct nd_prefix *pr; 768 struct nd_defrouter *dr; 769 { 770 struct nd_pfxrouter *search; 771 772 for (search = pr->ndpr_advrtrs.lh_first; search; search = search->pfr_next) { 773 if (search->router == dr) 774 break; 775 } 776 777 return(search); 778 } 779 780 static void 781 pfxrtr_add(pr, dr) 782 struct nd_prefix *pr; 783 struct nd_defrouter *dr; 784 { 785 struct nd_pfxrouter *new; 786 787 new = (struct nd_pfxrouter *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT); 788 if (new == NULL) 789 return; 790 bzero(new, sizeof(*new)); 791 new->router = dr; 792 793 LIST_INSERT_HEAD(&pr->ndpr_advrtrs, new, pfr_entry); 794 795 pfxlist_onlink_check(); 796 } 797 798 static void 799 pfxrtr_del(pfr) 800 struct nd_pfxrouter *pfr; 801 { 802 LIST_REMOVE(pfr, pfr_entry); 803 free(pfr, M_IP6NDP); 804 } 805 806 struct nd_prefix * 807 nd6_prefix_lookup(pr) 808 struct nd_prefix *pr; 809 { 810 struct nd_prefix *search; 811 812 for (search = nd_prefix.lh_first; search; search = search->ndpr_next) { 813 if (pr->ndpr_ifp == search->ndpr_ifp && 814 pr->ndpr_plen == search->ndpr_plen && 815 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr, 816 &search->ndpr_prefix.sin6_addr, 817 pr->ndpr_plen) 818 ) { 819 break; 820 } 821 } 822 823 return(search); 824 } 825 826 int 827 nd6_prelist_add(pr, dr, newp) 828 struct nd_prefix *pr, **newp; 829 struct nd_defrouter *dr; 830 { 831 struct nd_prefix *new = NULL; 832 int i, s; 833 834 new = (struct nd_prefix *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT); 835 if (new == NULL) 836 return ENOMEM; 837 bzero(new, sizeof(*new)); 838 *new = *pr; 839 if (newp != NULL) 840 *newp = new; 841 842 /* initilization */ 843 LIST_INIT(&new->ndpr_advrtrs); 844 in6_prefixlen2mask(&new->ndpr_mask, new->ndpr_plen); 845 /* make prefix in the canonical form */ 846 for (i = 0; i < 4; i++) 847 new->ndpr_prefix.sin6_addr.s6_addr32[i] &= 848 new->ndpr_mask.s6_addr32[i]; 849 850 s = splnet(); 851 /* link ndpr_entry to nd_prefix list */ 852 LIST_INSERT_HEAD(&nd_prefix, new, ndpr_entry); 853 splx(s); 854 855 /* ND_OPT_PI_FLAG_ONLINK processing */ 856 if (new->ndpr_raf_onlink) { 857 int e; 858 859 if ((e = nd6_prefix_onlink(new)) != 0) { 860 nd6log((LOG_ERR, "nd6_prelist_add: failed to make " 861 "the prefix %s/%d on-link on %s (errno=%d)\n", 862 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 863 pr->ndpr_plen, if_name(pr->ndpr_ifp), e)); 864 /* proceed anyway. XXX: is it correct? */ 865 } 866 } 867 868 if (dr) { 869 pfxrtr_add(new, dr); 870 } 871 872 return 0; 873 } 874 875 void 876 prelist_remove(pr) 877 struct nd_prefix *pr; 878 { 879 struct nd_pfxrouter *pfr, *next; 880 int e, s; 881 882 /* make sure to invalidate the prefix until it is really freed. */ 883 pr->ndpr_vltime = 0; 884 pr->ndpr_pltime = 0; 885 #if 0 886 /* 887 * Though these flags are now meaningless, we'd rather keep the value 888 * not to confuse users when executing "ndp -p". 889 */ 890 pr->ndpr_raf_onlink = 0; 891 pr->ndpr_raf_auto = 0; 892 #endif 893 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0 && 894 (e = nd6_prefix_offlink(pr)) != 0) { 895 nd6log((LOG_ERR, "prelist_remove: failed to make %s/%d offlink " 896 "on %s, errno=%d\n", 897 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 898 pr->ndpr_plen, if_name(pr->ndpr_ifp), e)); 899 /* what should we do? */ 900 } 901 902 if (pr->ndpr_refcnt > 0) 903 return; /* notice here? */ 904 905 s = splnet(); 906 907 /* unlink ndpr_entry from nd_prefix list */ 908 LIST_REMOVE(pr, ndpr_entry); 909 910 /* free list of routers that adversed the prefix */ 911 for (pfr = pr->ndpr_advrtrs.lh_first; pfr; pfr = next) { 912 next = pfr->pfr_next; 913 914 free(pfr, M_IP6NDP); 915 } 916 splx(s); 917 918 free(pr, M_IP6NDP); 919 920 pfxlist_onlink_check(); 921 } 922 923 int 924 prelist_update(new, dr, m) 925 struct nd_prefix *new; 926 struct nd_defrouter *dr; /* may be NULL */ 927 struct mbuf *m; 928 { 929 struct in6_ifaddr *ia6 = NULL, *ia6_match = NULL; 930 struct ifaddr *ifa; 931 struct ifnet *ifp = new->ndpr_ifp; 932 struct nd_prefix *pr; 933 int s = splnet(); 934 int error = 0; 935 int newprefix = 0; 936 int auth; 937 struct in6_addrlifetime lt6_tmp; 938 939 auth = 0; 940 if (m) { 941 /* 942 * Authenticity for NA consists authentication for 943 * both IP header and IP datagrams, doesn't it ? 944 */ 945 #if defined(M_AUTHIPHDR) && defined(M_AUTHIPDGM) 946 auth = (m->m_flags & M_AUTHIPHDR 947 && m->m_flags & M_AUTHIPDGM) ? 1 : 0; 948 #endif 949 } 950 951 952 if ((pr = nd6_prefix_lookup(new)) != NULL) { 953 /* 954 * nd6_prefix_lookup() ensures that pr and new have the same 955 * prefix on a same interface. 956 */ 957 958 /* 959 * Update prefix information. Note that the on-link (L) bit 960 * and the autonomous (A) bit should NOT be changed from 1 961 * to 0. 962 */ 963 if (new->ndpr_raf_onlink == 1) 964 pr->ndpr_raf_onlink = 1; 965 if (new->ndpr_raf_auto == 1) 966 pr->ndpr_raf_auto = 1; 967 if (new->ndpr_raf_onlink) { 968 pr->ndpr_vltime = new->ndpr_vltime; 969 pr->ndpr_pltime = new->ndpr_pltime; 970 pr->ndpr_preferred = new->ndpr_preferred; 971 pr->ndpr_expire = new->ndpr_expire; 972 } 973 974 if (new->ndpr_raf_onlink && 975 (pr->ndpr_stateflags & NDPRF_ONLINK) == 0) { 976 int e; 977 978 if ((e = nd6_prefix_onlink(pr)) != 0) { 979 nd6log((LOG_ERR, 980 "prelist_update: failed to make " 981 "the prefix %s/%d on-link on %s " 982 "(errno=%d)\n", 983 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 984 pr->ndpr_plen, if_name(pr->ndpr_ifp), e)); 985 /* proceed anyway. XXX: is it correct? */ 986 } 987 } 988 989 if (dr && pfxrtr_lookup(pr, dr) == NULL) 990 pfxrtr_add(pr, dr); 991 } else { 992 struct nd_prefix *newpr = NULL; 993 994 newprefix = 1; 995 996 if (new->ndpr_vltime == 0) 997 goto end; 998 if (new->ndpr_raf_onlink == 0 && new->ndpr_raf_auto == 0) 999 goto end; 1000 1001 bzero(&new->ndpr_addr, sizeof(struct in6_addr)); 1002 1003 error = nd6_prelist_add(new, dr, &newpr); 1004 if (error != 0 || newpr == NULL) { 1005 nd6log((LOG_NOTICE, "prelist_update: " 1006 "nd6_prelist_add failed for %s/%d on %s " 1007 "errno=%d, returnpr=%p\n", 1008 ip6_sprintf(&new->ndpr_prefix.sin6_addr), 1009 new->ndpr_plen, if_name(new->ndpr_ifp), 1010 error, newpr)); 1011 goto end; /* we should just give up in this case. */ 1012 } 1013 1014 /* 1015 * XXX: from the ND point of view, we can ignore a prefix 1016 * with the on-link bit being zero. However, we need a 1017 * prefix structure for references from autoconfigured 1018 * addresses. Thus, we explicitly make suret that the prefix 1019 * itself expires now. 1020 */ 1021 if (newpr->ndpr_raf_onlink == 0) { 1022 newpr->ndpr_vltime = 0; 1023 newpr->ndpr_pltime = 0; 1024 in6_init_prefix_ltimes(newpr); 1025 } 1026 1027 pr = newpr; 1028 } 1029 1030 /* 1031 * Address autoconfiguration based on Section 5.5.3 of RFC 2462. 1032 * Note that pr must be non NULL at this point. 1033 */ 1034 1035 /* 5.5.3 (a). Ignore the prefix without the A bit set. */ 1036 if (!new->ndpr_raf_auto) 1037 goto afteraddrconf; 1038 1039 /* 1040 * 5.5.3 (b). the link-local prefix should have been ignored in 1041 * nd6_ra_input. 1042 */ 1043 1044 /* 1045 * 5.5.3 (c). Consistency check on lifetimes: pltime <= vltime. 1046 * This should have been done in nd6_ra_input. 1047 */ 1048 1049 /* 1050 * 5.5.3 (d). If the prefix advertised does not match the prefix of an 1051 * address already in the list, and the Valid Lifetime is not 0, 1052 * form an address. Note that even a manually configured address 1053 * should reject autoconfiguration of a new address. 1054 */ 1055 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 1056 { 1057 struct in6_ifaddr *ifa6; 1058 int ifa_plen; 1059 u_int32_t storedlifetime; 1060 1061 if (ifa->ifa_addr->sa_family != AF_INET6) 1062 continue; 1063 1064 ifa6 = (struct in6_ifaddr *)ifa; 1065 1066 /* 1067 * Spec is not clear here, but I believe we should concentrate 1068 * on unicast (i.e. not anycast) addresses. 1069 * XXX: other ia6_flags? detached or duplicated? 1070 */ 1071 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0) 1072 continue; 1073 1074 ifa_plen = in6_mask2len(&ifa6->ia_prefixmask.sin6_addr, NULL); 1075 if (ifa_plen != new->ndpr_plen || 1076 !in6_are_prefix_equal(&ifa6->ia_addr.sin6_addr, 1077 &new->ndpr_prefix.sin6_addr, 1078 ifa_plen)) 1079 continue; 1080 1081 if (ia6_match == NULL) /* remember the first one */ 1082 ia6_match = ifa6; 1083 1084 if ((ifa6->ia6_flags & IN6_IFF_AUTOCONF) == 0) 1085 continue; 1086 1087 /* 1088 * An already autoconfigured address matched. Now that we 1089 * are sure there is at least one matched address, we can 1090 * proceed to 5.5.3. (e): update the lifetimes according to the 1091 * "two hours" rule and the privacy extension. 1092 */ 1093 #define TWOHOUR (120*60) 1094 lt6_tmp = ifa6->ia6_lifetime; 1095 1096 if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME) 1097 storedlifetime = ND6_INFINITE_LIFETIME; 1098 else if (IFA6_IS_INVALID(ifa6)) 1099 storedlifetime = 0; 1100 else 1101 storedlifetime = lt6_tmp.ia6t_expire - time_second; 1102 1103 /* when not updating, keep the current stored lifetime. */ 1104 lt6_tmp.ia6t_vltime = storedlifetime; 1105 1106 if (TWOHOUR < new->ndpr_vltime || 1107 storedlifetime < new->ndpr_vltime) { 1108 lt6_tmp.ia6t_vltime = new->ndpr_vltime; 1109 } else if (storedlifetime <= TWOHOUR 1110 #if 0 1111 /* 1112 * This condition is logically redundant, so we just 1113 * omit it. 1114 * See IPng 6712, 6717, and 6721. 1115 */ 1116 && new->ndpr_vltime <= storedlifetime 1117 #endif 1118 ) { 1119 if (auth) { 1120 lt6_tmp.ia6t_vltime = new->ndpr_vltime; 1121 } 1122 } else { 1123 /* 1124 * new->ndpr_vltime <= TWOHOUR && 1125 * TWOHOUR < storedlifetime 1126 */ 1127 lt6_tmp.ia6t_vltime = TWOHOUR; 1128 } 1129 1130 /* The 2 hour rule is not imposed for preferred lifetime. */ 1131 lt6_tmp.ia6t_pltime = new->ndpr_pltime; 1132 1133 in6_init_address_ltimes(pr, <6_tmp); 1134 1135 /* 1136 * When adjusting the lifetimes of an existing temporary 1137 * address, only lower the lifetimes. 1138 * RFC 3041 3.3. (1). 1139 * XXX: how should we modify ia6t_[pv]ltime? 1140 */ 1141 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0) { 1142 if (lt6_tmp.ia6t_expire == 0 || /* no expire */ 1143 lt6_tmp.ia6t_expire > 1144 ifa6->ia6_lifetime.ia6t_expire) { 1145 lt6_tmp.ia6t_expire = 1146 ifa6->ia6_lifetime.ia6t_expire; 1147 } 1148 if (lt6_tmp.ia6t_preferred == 0 || /* no expire */ 1149 lt6_tmp.ia6t_preferred > 1150 ifa6->ia6_lifetime.ia6t_preferred) { 1151 lt6_tmp.ia6t_preferred = 1152 ifa6->ia6_lifetime.ia6t_preferred; 1153 } 1154 } 1155 1156 ifa6->ia6_lifetime = lt6_tmp; 1157 } 1158 if (ia6_match == NULL && new->ndpr_vltime) { 1159 /* 1160 * No address matched and the valid lifetime is non-zero. 1161 * Create a new address. 1162 */ 1163 if ((ia6 = in6_ifadd(new, NULL)) != NULL) { 1164 /* 1165 * note that we should use pr (not new) for reference. 1166 */ 1167 pr->ndpr_refcnt++; 1168 ia6->ia6_ndpr = pr; 1169 1170 #if 0 1171 /* XXXYYY Don't do this, according to Jinmei. */ 1172 pr->ndpr_addr = new->ndpr_addr; 1173 #endif 1174 1175 /* 1176 * RFC 3041 3.3 (2). 1177 * When a new public address is created as described 1178 * in RFC2462, also create a new temporary address. 1179 * 1180 * RFC 3041 3.5. 1181 * When an interface connects to a new link, a new 1182 * randomized interface identifier should be generated 1183 * immediately together with a new set of temporary 1184 * addresses. Thus, we specifiy 1 as the 2nd arg of 1185 * in6_tmpifadd(). 1186 */ 1187 if (ip6_use_tempaddr) { 1188 int e; 1189 if ((e = in6_tmpifadd(ia6, 1)) != 0) { 1190 nd6log((LOG_NOTICE, "prelist_update: " 1191 "failed to create a temporary " 1192 "address, errno=%d\n", 1193 e)); 1194 } 1195 } 1196 1197 /* 1198 * A newly added address might affect the status 1199 * of other addresses, so we check and update it. 1200 * XXX: what if address duplication happens? 1201 */ 1202 pfxlist_onlink_check(); 1203 } else { 1204 /* just set an error. do not bark here. */ 1205 error = EADDRNOTAVAIL; /* XXX: might be unused. */ 1206 } 1207 } 1208 1209 afteraddrconf: 1210 1211 end: 1212 splx(s); 1213 return error; 1214 } 1215 1216 /* 1217 * A supplement function used in the on-link detection below; 1218 * detect if a given prefix has a (probably) reachable advertising router. 1219 * XXX: lengthy function name... 1220 */ 1221 static struct nd_pfxrouter * 1222 find_pfxlist_reachable_router(pr) 1223 struct nd_prefix *pr; 1224 { 1225 struct nd_pfxrouter *pfxrtr; 1226 struct rtentry *rt; 1227 struct llinfo_nd6 *ln; 1228 1229 for (pfxrtr = LIST_FIRST(&pr->ndpr_advrtrs); pfxrtr; 1230 pfxrtr = LIST_NEXT(pfxrtr, pfr_entry)) { 1231 if ((rt = nd6_lookup(&pfxrtr->router->rtaddr, 0, 1232 pfxrtr->router->ifp)) && 1233 (ln = (struct llinfo_nd6 *)rt->rt_llinfo) && 1234 ND6_IS_LLINFO_PROBREACH(ln)) 1235 break; /* found */ 1236 } 1237 1238 return(pfxrtr); 1239 1240 } 1241 1242 /* 1243 * Check if each prefix in the prefix list has at least one available router 1244 * that advertised the prefix (a router is "available" if its neighbor cache 1245 * entry is reachable or probably reachable). 1246 * If the check fails, the prefix may be off-link, because, for example, 1247 * we have moved from the network but the lifetime of the prefix has not 1248 * expired yet. So we should not use the prefix if there is another prefix 1249 * that has an available router. 1250 * But, if there is no prefix that has an available router, we still regards 1251 * all the prefixes as on-link. This is because we can't tell if all the 1252 * routers are simply dead or if we really moved from the network and there 1253 * is no router around us. 1254 */ 1255 void 1256 pfxlist_onlink_check() 1257 { 1258 struct nd_prefix *pr; 1259 struct in6_ifaddr *ifa; 1260 1261 /* 1262 * Check if there is a prefix that has a reachable advertising 1263 * router. 1264 */ 1265 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 1266 if (pr->ndpr_raf_onlink && find_pfxlist_reachable_router(pr)) 1267 break; 1268 } 1269 1270 if (pr) { 1271 /* 1272 * There is at least one prefix that has a reachable router. 1273 * Detach prefixes which have no reachable advertising 1274 * router, and attach other prefixes. 1275 */ 1276 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 1277 /* XXX: a link-local prefix should never be detached */ 1278 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr)) 1279 continue; 1280 1281 /* 1282 * we aren't interested in prefixes without the L bit 1283 * set. 1284 */ 1285 if (pr->ndpr_raf_onlink == 0) 1286 continue; 1287 1288 if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 && 1289 find_pfxlist_reachable_router(pr) == NULL) 1290 pr->ndpr_stateflags |= NDPRF_DETACHED; 1291 if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 && 1292 find_pfxlist_reachable_router(pr) != 0) 1293 pr->ndpr_stateflags &= ~NDPRF_DETACHED; 1294 } 1295 } else { 1296 /* there is no prefix that has a reachable router */ 1297 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 1298 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr)) 1299 continue; 1300 1301 if (pr->ndpr_raf_onlink == 0) 1302 continue; 1303 1304 if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0) 1305 pr->ndpr_stateflags &= ~NDPRF_DETACHED; 1306 } 1307 } 1308 1309 /* 1310 * Remove each interface route associated with a (just) detached 1311 * prefix, and reinstall the interface route for a (just) attached 1312 * prefix. Note that all attempt of reinstallation does not 1313 * necessarily success, when a same prefix is shared among multiple 1314 * interfaces. Such cases will be handled in nd6_prefix_onlink, 1315 * so we don't have to care about them. 1316 */ 1317 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 1318 int e; 1319 1320 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr)) 1321 continue; 1322 1323 if (pr->ndpr_raf_onlink == 0) 1324 continue; 1325 1326 if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 && 1327 (pr->ndpr_stateflags & NDPRF_ONLINK) != 0) { 1328 if ((e = nd6_prefix_offlink(pr)) != 0) { 1329 nd6log((LOG_ERR, 1330 "pfxlist_onlink_check: failed to " 1331 "make %s/%d offlink, errno=%d\n", 1332 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 1333 pr->ndpr_plen, e)); 1334 } 1335 } 1336 if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 && 1337 (pr->ndpr_stateflags & NDPRF_ONLINK) == 0 && 1338 pr->ndpr_raf_onlink) { 1339 if ((e = nd6_prefix_onlink(pr)) != 0) { 1340 nd6log((LOG_ERR, 1341 "pfxlist_onlink_check: failed to " 1342 "make %s/%d offlink, errno=%d\n", 1343 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 1344 pr->ndpr_plen, e)); 1345 } 1346 } 1347 } 1348 1349 /* 1350 * Changes on the prefix status might affect address status as well. 1351 * Make sure that all addresses derived from an attached prefix are 1352 * attached, and that all addresses derived from a detached prefix are 1353 * detached. Note, however, that a manually configured address should 1354 * always be attached. 1355 * The precise detection logic is same as the one for prefixes. 1356 */ 1357 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) { 1358 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0) 1359 continue; 1360 1361 if (ifa->ia6_ndpr == NULL) { 1362 /* 1363 * This can happen when we first configure the address 1364 * (i.e. the address exists, but the prefix does not). 1365 * XXX: complicated relationships... 1366 */ 1367 continue; 1368 } 1369 1370 if (find_pfxlist_reachable_router(ifa->ia6_ndpr)) 1371 break; 1372 } 1373 if (ifa) { 1374 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) { 1375 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0) 1376 continue; 1377 1378 if (ifa->ia6_ndpr == NULL) /* XXX: see above. */ 1379 continue; 1380 1381 if (find_pfxlist_reachable_router(ifa->ia6_ndpr)) 1382 ifa->ia6_flags &= ~IN6_IFF_DETACHED; 1383 else 1384 ifa->ia6_flags |= IN6_IFF_DETACHED; 1385 } 1386 } 1387 else { 1388 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) { 1389 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0) 1390 continue; 1391 1392 ifa->ia6_flags &= ~IN6_IFF_DETACHED; 1393 } 1394 } 1395 } 1396 1397 int 1398 nd6_prefix_onlink(pr) 1399 struct nd_prefix *pr; 1400 { 1401 struct ifaddr *ifa; 1402 struct ifnet *ifp = pr->ndpr_ifp; 1403 struct sockaddr_in6 mask6; 1404 struct nd_prefix *opr; 1405 u_long rtflags; 1406 int error = 0; 1407 struct rtentry *rt = NULL; 1408 1409 /* sanity check */ 1410 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0) { 1411 nd6log((LOG_ERR, 1412 "nd6_prefix_onlink: %s/%d is already on-link\n", 1413 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen); 1414 return(EEXIST)); 1415 } 1416 1417 /* 1418 * Add the interface route associated with the prefix. Before 1419 * installing the route, check if there's the same prefix on another 1420 * interface, and the prefix has already installed the interface route. 1421 * Although such a configuration is expected to be rare, we explicitly 1422 * allow it. 1423 */ 1424 for (opr = nd_prefix.lh_first; opr; opr = opr->ndpr_next) { 1425 if (opr == pr) 1426 continue; 1427 1428 if ((opr->ndpr_stateflags & NDPRF_ONLINK) == 0) 1429 continue; 1430 1431 if (opr->ndpr_plen == pr->ndpr_plen && 1432 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr, 1433 &opr->ndpr_prefix.sin6_addr, 1434 pr->ndpr_plen)) 1435 return(0); 1436 } 1437 1438 /* 1439 * We prefer link-local addresses as the associated interface address. 1440 */ 1441 /* search for a link-local addr */ 1442 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 1443 IN6_IFF_NOTREADY| 1444 IN6_IFF_ANYCAST); 1445 if (ifa == NULL) { 1446 /* XXX: freebsd does not have ifa_ifwithaf */ 1447 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 1448 { 1449 if (ifa->ifa_addr->sa_family == AF_INET6) 1450 break; 1451 } 1452 /* should we care about ia6_flags? */ 1453 } 1454 if (ifa == NULL) { 1455 /* 1456 * This can still happen, when, for example, we receive an RA 1457 * containing a prefix with the L bit set and the A bit clear, 1458 * after removing all IPv6 addresses on the receiving 1459 * interface. This should, of course, be rare though. 1460 */ 1461 nd6log((LOG_NOTICE, 1462 "nd6_prefix_onlink: failed to find any ifaddr" 1463 " to add route for a prefix(%s/%d) on %s\n", 1464 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 1465 pr->ndpr_plen, if_name(ifp))); 1466 return(0); 1467 } 1468 1469 /* 1470 * in6_ifinit() sets nd6_rtrequest to ifa_rtrequest for all ifaddrs. 1471 * ifa->ifa_rtrequest = nd6_rtrequest; 1472 */ 1473 bzero(&mask6, sizeof(mask6)); 1474 mask6.sin6_len = sizeof(mask6); 1475 mask6.sin6_addr = pr->ndpr_mask; 1476 rtflags = ifa->ifa_flags | RTF_CLONING | RTF_UP; 1477 if (nd6_need_cache(ifp)) { 1478 /* explicitly set in case ifa_flags does not set the flag. */ 1479 rtflags |= RTF_CLONING; 1480 } else { 1481 /* 1482 * explicitly clear the cloning bit in case ifa_flags sets it. 1483 */ 1484 rtflags &= ~RTF_CLONING; 1485 } 1486 error = rtrequest(RTM_ADD, (struct sockaddr *)&pr->ndpr_prefix, 1487 ifa->ifa_addr, (struct sockaddr *)&mask6, 1488 rtflags, &rt); 1489 if (error == 0) { 1490 if (rt != NULL) /* this should be non NULL, though */ 1491 nd6_rtmsg(RTM_ADD, rt); 1492 pr->ndpr_stateflags |= NDPRF_ONLINK; 1493 } 1494 else { 1495 nd6log((LOG_ERR, "nd6_prefix_onlink: failed to add route for a" 1496 " prefix (%s/%d) on %s, gw=%s, mask=%s, flags=%lx " 1497 "errno = %d\n", 1498 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 1499 pr->ndpr_plen, if_name(ifp), 1500 ip6_sprintf(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr), 1501 ip6_sprintf(&mask6.sin6_addr), rtflags, error)); 1502 } 1503 1504 if (rt != NULL) 1505 rt->rt_refcnt--; 1506 1507 return(error); 1508 } 1509 1510 int 1511 nd6_prefix_offlink(pr) 1512 struct nd_prefix *pr; 1513 { 1514 int error = 0; 1515 struct ifnet *ifp = pr->ndpr_ifp; 1516 struct nd_prefix *opr; 1517 struct sockaddr_in6 sa6, mask6; 1518 struct rtentry *rt = NULL; 1519 1520 /* sanity check */ 1521 if ((pr->ndpr_stateflags & NDPRF_ONLINK) == 0) { 1522 nd6log((LOG_ERR, 1523 "nd6_prefix_offlink: %s/%d is already off-link\n", 1524 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen)); 1525 return(EEXIST); 1526 } 1527 1528 bzero(&sa6, sizeof(sa6)); 1529 sa6.sin6_family = AF_INET6; 1530 sa6.sin6_len = sizeof(sa6); 1531 bcopy(&pr->ndpr_prefix.sin6_addr, &sa6.sin6_addr, 1532 sizeof(struct in6_addr)); 1533 bzero(&mask6, sizeof(mask6)); 1534 mask6.sin6_family = AF_INET6; 1535 mask6.sin6_len = sizeof(sa6); 1536 bcopy(&pr->ndpr_mask, &mask6.sin6_addr, sizeof(struct in6_addr)); 1537 error = rtrequest(RTM_DELETE, (struct sockaddr *)&sa6, NULL, 1538 (struct sockaddr *)&mask6, 0, &rt); 1539 if (error == 0) { 1540 pr->ndpr_stateflags &= ~NDPRF_ONLINK; 1541 1542 /* report the route deletion to the routing socket. */ 1543 if (rt != NULL) 1544 nd6_rtmsg(RTM_DELETE, rt); 1545 1546 /* 1547 * There might be the same prefix on another interface, 1548 * the prefix which could not be on-link just because we have 1549 * the interface route (see comments in nd6_prefix_onlink). 1550 * If there's one, try to make the prefix on-link on the 1551 * interface. 1552 */ 1553 for (opr = nd_prefix.lh_first; opr; opr = opr->ndpr_next) { 1554 if (opr == pr) 1555 continue; 1556 1557 if ((opr->ndpr_stateflags & NDPRF_ONLINK) != 0) 1558 continue; 1559 1560 /* 1561 * KAME specific: detached prefixes should not be 1562 * on-link. 1563 */ 1564 if ((opr->ndpr_stateflags & NDPRF_DETACHED) != 0) 1565 continue; 1566 1567 if (opr->ndpr_plen == pr->ndpr_plen && 1568 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr, 1569 &opr->ndpr_prefix.sin6_addr, 1570 pr->ndpr_plen)) { 1571 int e; 1572 1573 if ((e = nd6_prefix_onlink(opr)) != 0) { 1574 nd6log((LOG_ERR, 1575 "nd6_prefix_offlink: failed to " 1576 "recover a prefix %s/%d from %s " 1577 "to %s (errno = %d)\n", 1578 ip6_sprintf(&opr->ndpr_prefix.sin6_addr), 1579 opr->ndpr_plen, if_name(ifp), 1580 if_name(opr->ndpr_ifp), e)); 1581 } 1582 } 1583 } 1584 } 1585 else { 1586 /* XXX: can we still set the NDPRF_ONLINK flag? */ 1587 nd6log((LOG_ERR, 1588 "nd6_prefix_offlink: failed to delete route: " 1589 "%s/%d on %s (errno = %d)\n", 1590 ip6_sprintf(&sa6.sin6_addr), pr->ndpr_plen, if_name(ifp), 1591 error)); 1592 } 1593 1594 if (rt != NULL) { 1595 if (rt->rt_refcnt <= 0) { 1596 /* XXX: we should free the entry ourselves. */ 1597 rt->rt_refcnt++; 1598 rtfree(rt); 1599 } 1600 } 1601 1602 return(error); 1603 } 1604 1605 static struct in6_ifaddr * 1606 in6_ifadd(pr, ifid) 1607 struct nd_prefix *pr; 1608 struct in6_addr *ifid; /* Mobile IPv6 addition */ 1609 { 1610 struct ifnet *ifp = pr->ndpr_ifp; 1611 struct ifaddr *ifa; 1612 struct in6_aliasreq ifra; 1613 struct in6_ifaddr *ia, *ib; 1614 int error, plen0; 1615 struct in6_addr mask; 1616 int prefixlen = pr->ndpr_plen; 1617 1618 in6_len2mask(&mask, prefixlen); 1619 1620 /* 1621 * find a link-local address (will be interface ID). 1622 * Is it really mandatory? Theoretically, a global or a site-local 1623 * address can be configured without a link-local address, if we 1624 * have a unique interface identifier... 1625 * 1626 * it is not mandatory to have a link-local address, we can generate 1627 * interface identifier on the fly. we do this because: 1628 * (1) it should be the easiest way to find interface identifier. 1629 * (2) RFC2462 5.4 suggesting the use of the same interface identifier 1630 * for multiple addresses on a single interface, and possible shortcut 1631 * of DAD. we omitted DAD for this reason in the past. 1632 * (3) a user can prevent autoconfiguration of global address 1633 * by removing link-local address by hand (this is partly because we 1634 * don't have other way to control the use of IPv6 on a interface. 1635 * this has been our design choice - cf. NRL's "ifconfig auto"). 1636 * (4) it is easier to manage when an interface has addresses 1637 * with the same interface identifier, than to have multiple addresses 1638 * with different interface identifiers. 1639 * 1640 * Mobile IPv6 addition: allow for caller to specify a wished interface 1641 * ID. This is to not break connections when moving addresses between 1642 * interfaces. 1643 */ 1644 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0);/* 0 is OK? */ 1645 if (ifa) 1646 ib = (struct in6_ifaddr *)ifa; 1647 else 1648 return NULL; 1649 1650 #if 0 /* don't care link local addr state, and always do DAD */ 1651 /* if link-local address is not eligible, do not autoconfigure. */ 1652 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) { 1653 printf("in6_ifadd: link-local address not ready\n"); 1654 return NULL; 1655 } 1656 #endif 1657 1658 /* prefixlen + ifidlen must be equal to 128 */ 1659 plen0 = in6_mask2len(&ib->ia_prefixmask.sin6_addr, NULL); 1660 if (prefixlen != plen0) { 1661 nd6log((LOG_INFO, "in6_ifadd: wrong prefixlen for %s " 1662 "(prefix=%d ifid=%d)\n", 1663 if_name(ifp), prefixlen, 128 - plen0)); 1664 return NULL; 1665 } 1666 1667 /* make ifaddr */ 1668 1669 bzero(&ifra, sizeof(ifra)); 1670 /* 1671 * in6_update_ifa() does not use ifra_name, but we accurately set it 1672 * for safety. 1673 */ 1674 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 1675 ifra.ifra_addr.sin6_family = AF_INET6; 1676 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 1677 /* prefix */ 1678 bcopy(&pr->ndpr_prefix.sin6_addr, &ifra.ifra_addr.sin6_addr, 1679 sizeof(ifra.ifra_addr.sin6_addr)); 1680 ifra.ifra_addr.sin6_addr.s6_addr32[0] &= mask.s6_addr32[0]; 1681 ifra.ifra_addr.sin6_addr.s6_addr32[1] &= mask.s6_addr32[1]; 1682 ifra.ifra_addr.sin6_addr.s6_addr32[2] &= mask.s6_addr32[2]; 1683 ifra.ifra_addr.sin6_addr.s6_addr32[3] &= mask.s6_addr32[3]; 1684 1685 /* interface ID */ 1686 if (ifid == NULL || IN6_IS_ADDR_UNSPECIFIED(ifid)) 1687 ifid = &ib->ia_addr.sin6_addr; 1688 ifra.ifra_addr.sin6_addr.s6_addr32[0] 1689 |= (ifid->s6_addr32[0] & ~mask.s6_addr32[0]); 1690 ifra.ifra_addr.sin6_addr.s6_addr32[1] 1691 |= (ifid->s6_addr32[1] & ~mask.s6_addr32[1]); 1692 ifra.ifra_addr.sin6_addr.s6_addr32[2] 1693 |= (ifid->s6_addr32[2] & ~mask.s6_addr32[2]); 1694 ifra.ifra_addr.sin6_addr.s6_addr32[3] 1695 |= (ifid->s6_addr32[3] & ~mask.s6_addr32[3]); 1696 1697 /* new prefix mask. */ 1698 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 1699 ifra.ifra_prefixmask.sin6_family = AF_INET6; 1700 bcopy(&mask, &ifra.ifra_prefixmask.sin6_addr, 1701 sizeof(ifra.ifra_prefixmask.sin6_addr)); 1702 1703 /* 1704 * lifetime. 1705 * XXX: in6_init_address_ltimes would override these values later. 1706 * We should reconsider this logic. 1707 */ 1708 ifra.ifra_lifetime.ia6t_vltime = pr->ndpr_vltime; 1709 ifra.ifra_lifetime.ia6t_pltime = pr->ndpr_pltime; 1710 1711 /* XXX: scope zone ID? */ 1712 1713 ifra.ifra_flags |= IN6_IFF_AUTOCONF; /* obey autoconf */ 1714 /* 1715 * temporarily set the nopfx flag to avoid conflict. 1716 * XXX: we should reconsider the entire mechanism about prefix 1717 * manipulation. 1718 */ 1719 ifra.ifra_flags |= IN6_IFF_NOPFX; 1720 1721 /* 1722 * keep the new address, regardless of the result of in6_update_ifa. 1723 * XXX: this address is now meaningless. 1724 * We should reconsider its role. 1725 */ 1726 pr->ndpr_addr = ifra.ifra_addr.sin6_addr; 1727 1728 /* allocate ifaddr structure, link into chain, etc. */ 1729 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) { 1730 nd6log((LOG_ERR, 1731 "in6_ifadd: failed to make ifaddr %s on %s (errno=%d)\n", 1732 ip6_sprintf(&ifra.ifra_addr.sin6_addr), if_name(ifp), 1733 error)); 1734 return(NULL); /* ifaddr must not have been allocated. */ 1735 } 1736 1737 ia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr); 1738 1739 return(ia); /* this must NOT be NULL. */ 1740 } 1741 1742 int 1743 in6_tmpifadd(ia0, forcegen) 1744 const struct in6_ifaddr *ia0; /* corresponding public address */ 1745 { 1746 struct ifnet *ifp = ia0->ia_ifa.ifa_ifp; 1747 struct in6_ifaddr *newia; 1748 struct in6_aliasreq ifra; 1749 int i, error; 1750 int trylimit = 3; /* XXX: adhoc value */ 1751 u_int32_t randid[2]; 1752 time_t vltime0, pltime0; 1753 1754 bzero(&ifra, sizeof(ifra)); 1755 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 1756 ifra.ifra_addr = ia0->ia_addr; 1757 /* copy prefix mask */ 1758 ifra.ifra_prefixmask = ia0->ia_prefixmask; 1759 /* clear the old IFID */ 1760 for (i = 0; i < 4; i++) { 1761 ifra.ifra_addr.sin6_addr.s6_addr32[i] 1762 &= ifra.ifra_prefixmask.sin6_addr.s6_addr32[i]; 1763 } 1764 1765 again: 1766 in6_get_tmpifid(ifp, (u_int8_t *)randid, 1767 (const u_int8_t *)&ia0->ia_addr.sin6_addr.s6_addr[8], 1768 forcegen); 1769 ifra.ifra_addr.sin6_addr.s6_addr32[2] 1770 |= (randid[0] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[2])); 1771 ifra.ifra_addr.sin6_addr.s6_addr32[3] 1772 |= (randid[1] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[3])); 1773 1774 /* 1775 * If by chance the new temporary address is the same as an address 1776 * already assigned to the interface, generate a new randomized 1777 * interface identifier and repeat this step. 1778 * RFC 3041 3.3 (4). 1779 */ 1780 if (in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr) != NULL) { 1781 if (trylimit-- == 0) { 1782 nd6log((LOG_NOTICE, "in6_tmpifadd: failed to find " 1783 "a unique random IFID\n")); 1784 return(EEXIST); 1785 } 1786 forcegen = 1; 1787 goto again; 1788 } 1789 1790 /* 1791 * The Valid Lifetime is the lower of the Valid Lifetime of the 1792 * public address or TEMP_VALID_LIFETIME. 1793 * The Preferred Lifetime is the lower of the Preferred Lifetime 1794 * of the public address or TEMP_PREFERRED_LIFETIME - 1795 * DESYNC_FACTOR. 1796 */ 1797 if (ia0->ia6_lifetime.ia6t_expire != 0) { 1798 vltime0 = IFA6_IS_INVALID(ia0) ? 0 : 1799 (ia0->ia6_lifetime.ia6t_expire - time_second); 1800 if (vltime0 > ip6_temp_valid_lifetime) 1801 vltime0 = ip6_temp_valid_lifetime; 1802 } else 1803 vltime0 = ip6_temp_valid_lifetime; 1804 if (ia0->ia6_lifetime.ia6t_preferred != 0) { 1805 pltime0 = IFA6_IS_DEPRECATED(ia0) ? 0 : 1806 (ia0->ia6_lifetime.ia6t_preferred - time_second); 1807 if (pltime0 > ip6_temp_preferred_lifetime - ip6_desync_factor){ 1808 pltime0 = ip6_temp_preferred_lifetime - 1809 ip6_desync_factor; 1810 } 1811 } else 1812 pltime0 = ip6_temp_preferred_lifetime - ip6_desync_factor; 1813 ifra.ifra_lifetime.ia6t_vltime = vltime0; 1814 ifra.ifra_lifetime.ia6t_pltime = pltime0; 1815 1816 /* 1817 * A temporary address is created only if this calculated Preferred 1818 * Lifetime is greater than REGEN_ADVANCE time units. 1819 */ 1820 if (ifra.ifra_lifetime.ia6t_pltime <= ip6_temp_regen_advance) 1821 return(0); 1822 1823 /* XXX: scope zone ID? */ 1824 1825 ifra.ifra_flags |= (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY); 1826 1827 /* allocate ifaddr structure, link into chain, etc. */ 1828 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) 1829 return(error); 1830 1831 newia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr); 1832 if (newia == NULL) { /* XXX: can it happen? */ 1833 nd6log((LOG_ERR, 1834 "in6_tmpifadd: ifa update succeeded, but we got " 1835 "no ifaddr\n")); 1836 return(EINVAL); /* XXX */ 1837 } 1838 newia->ia6_ndpr = ia0->ia6_ndpr; 1839 newia->ia6_ndpr->ndpr_refcnt++; 1840 1841 return(0); 1842 } 1843 1844 int 1845 in6_init_prefix_ltimes(struct nd_prefix *ndpr) 1846 { 1847 /* check if preferred lifetime > valid lifetime. RFC2462 5.5.3 (c) */ 1848 if (ndpr->ndpr_pltime > ndpr->ndpr_vltime) { 1849 nd6log((LOG_INFO, "in6_init_prefix_ltimes: preferred lifetime" 1850 "(%d) is greater than valid lifetime(%d)\n", 1851 (u_int)ndpr->ndpr_pltime, (u_int)ndpr->ndpr_vltime)); 1852 return (EINVAL); 1853 } 1854 if (ndpr->ndpr_pltime == ND6_INFINITE_LIFETIME) 1855 ndpr->ndpr_preferred = 0; 1856 else 1857 ndpr->ndpr_preferred = time_second + ndpr->ndpr_pltime; 1858 if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME) 1859 ndpr->ndpr_expire = 0; 1860 else 1861 ndpr->ndpr_expire = time_second + ndpr->ndpr_vltime; 1862 1863 return 0; 1864 } 1865 1866 static void 1867 in6_init_address_ltimes(struct nd_prefix *new, struct in6_addrlifetime *lt6) 1868 { 1869 /* init ia6t_expire */ 1870 if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME) 1871 lt6->ia6t_expire = 0; 1872 else { 1873 lt6->ia6t_expire = time_second; 1874 lt6->ia6t_expire += lt6->ia6t_vltime; 1875 } 1876 1877 /* init ia6t_preferred */ 1878 if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME) 1879 lt6->ia6t_preferred = 0; 1880 else { 1881 lt6->ia6t_preferred = time_second; 1882 lt6->ia6t_preferred += lt6->ia6t_pltime; 1883 } 1884 } 1885 1886 /* 1887 * Delete all the routing table entries that use the specified gateway. 1888 * XXX: this function causes search through all entries of routing table, so 1889 * it shouldn't be called when acting as a router. 1890 */ 1891 void 1892 rt6_flush(gateway, ifp) 1893 struct in6_addr *gateway; 1894 struct ifnet *ifp; 1895 { 1896 struct radix_node_head *rnh = rt_tables[AF_INET6]; 1897 int s = splnet(); 1898 1899 /* We'll care only link-local addresses */ 1900 if (!IN6_IS_ADDR_LINKLOCAL(gateway)) { 1901 splx(s); 1902 return; 1903 } 1904 /* XXX: hack for KAME's link-local address kludge */ 1905 gateway->s6_addr16[1] = htons(ifp->if_index); 1906 1907 rnh->rnh_walktree(rnh, rt6_deleteroute, (void *)gateway); 1908 splx(s); 1909 } 1910 1911 static int 1912 rt6_deleteroute(rn, arg) 1913 struct radix_node *rn; 1914 void *arg; 1915 { 1916 #define SIN6(s) ((struct sockaddr_in6 *)s) 1917 struct rtentry *rt = (struct rtentry *)rn; 1918 struct in6_addr *gate = (struct in6_addr *)arg; 1919 1920 if (rt->rt_gateway == NULL || rt->rt_gateway->sa_family != AF_INET6) 1921 return(0); 1922 1923 if (!IN6_ARE_ADDR_EQUAL(gate, &SIN6(rt->rt_gateway)->sin6_addr)) 1924 return(0); 1925 1926 /* 1927 * Do not delete a static route. 1928 * XXX: this seems to be a bit ad-hoc. Should we consider the 1929 * 'cloned' bit instead? 1930 */ 1931 if ((rt->rt_flags & RTF_STATIC) != 0) 1932 return(0); 1933 1934 /* 1935 * We delete only host route. This means, in particular, we don't 1936 * delete default route. 1937 */ 1938 if ((rt->rt_flags & RTF_HOST) == 0) 1939 return(0); 1940 1941 return(rtrequest(RTM_DELETE, rt_key(rt), 1942 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0)); 1943 #undef SIN6 1944 } 1945 1946 int 1947 nd6_setdefaultiface(ifindex) 1948 int ifindex; 1949 { 1950 int error = 0; 1951 1952 if (ifindex < 0 || if_index < ifindex) 1953 return(EINVAL); 1954 1955 if (nd6_defifindex != ifindex) { 1956 nd6_defifindex = ifindex; 1957 if (nd6_defifindex > 0) 1958 nd6_defifp = ifindex2ifnet[nd6_defifindex]; 1959 else 1960 nd6_defifp = NULL; 1961 1962 /* 1963 * If the Default Router List is empty, install a route 1964 * to the specified interface as default or remove the default 1965 * route when the default interface becomes canceled. 1966 * The check for the queue is actually redundant, but 1967 * we do this here to avoid re-install the default route 1968 * if the list is NOT empty. 1969 */ 1970 if (TAILQ_FIRST(&nd_defrouter) == NULL) 1971 defrouter_select(); 1972 1973 /* 1974 * Our current implementation assumes one-to-one maping between 1975 * interfaces and links, so it would be natural to use the 1976 * default interface as the default link. 1977 */ 1978 scope6_setdefault(nd6_defifp); 1979 } 1980 1981 return(error); 1982 } 1983