1 /* $FreeBSD$ */ 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 48 #include <net/if.h> 49 #include <net/if_types.h> 50 #include <net/if_dl.h> 51 #include <net/route.h> 52 #include <net/radix.h> 53 54 #include <netinet/in.h> 55 #include <netinet6/in6_var.h> 56 #include <netinet6/in6_ifattach.h> 57 #include <netinet/ip6.h> 58 #include <netinet6/ip6_var.h> 59 #include <netinet6/nd6.h> 60 #include <netinet/icmp6.h> 61 #include <netinet6/scope6_var.h> 62 63 #include <net/net_osdep.h> 64 65 #define SDL(s) ((struct sockaddr_dl *)s) 66 67 static struct nd_defrouter *defrtrlist_update __P((struct nd_defrouter *)); 68 static struct in6_ifaddr *in6_ifadd __P((struct nd_prefix *, 69 struct in6_addr *)); 70 static struct nd_pfxrouter *pfxrtr_lookup __P((struct nd_prefix *, 71 struct nd_defrouter *)); 72 static void pfxrtr_add __P((struct nd_prefix *, struct nd_defrouter *)); 73 static void pfxrtr_del __P((struct nd_pfxrouter *)); 74 static struct nd_pfxrouter *find_pfxlist_reachable_router 75 __P((struct nd_prefix *)); 76 static void defrouter_addifreq __P((struct ifnet *)); 77 static void nd6_rtmsg __P((int, struct rtentry *)); 78 79 static void in6_init_address_ltimes __P((struct nd_prefix *ndpr, 80 struct in6_addrlifetime *lt6)); 81 82 static int rt6_deleteroute __P((struct radix_node *, void *)); 83 84 extern int nd6_recalc_reachtm_interval; 85 86 static struct ifnet *nd6_defifp; 87 int nd6_defifindex; 88 89 int ip6_use_tempaddr = 0; 90 91 int ip6_desync_factor; 92 u_int32_t ip6_temp_preferred_lifetime = DEF_TEMP_PREFERRED_LIFETIME; 93 u_int32_t ip6_temp_valid_lifetime = DEF_TEMP_VALID_LIFETIME; 94 /* 95 * shorter lifetimes for debugging purposes. 96 int ip6_temp_preferred_lifetime = 800; 97 static int ip6_temp_valid_lifetime = 1800; 98 */ 99 int ip6_temp_regen_advance = TEMPADDR_REGEN_ADVANCE; 100 101 /* 102 * Receive Router Solicitation Message - just for routers. 103 * Router solicitation/advertisement is mostly managed by userland program 104 * (rtadvd) so here we have no function like nd6_ra_output(). 105 * 106 * Based on RFC 2461 107 */ 108 void 109 nd6_rs_input(m, off, icmp6len) 110 struct mbuf *m; 111 int off, icmp6len; 112 { 113 struct ifnet *ifp = m->m_pkthdr.rcvif; 114 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 115 struct nd_router_solicit *nd_rs; 116 struct in6_addr saddr6 = ip6->ip6_src; 117 #if 0 118 struct in6_addr daddr6 = ip6->ip6_dst; 119 #endif 120 char *lladdr = NULL; 121 int lladdrlen = 0; 122 #if 0 123 struct sockaddr_dl *sdl = (struct sockaddr_dl *)NULL; 124 struct llinfo_nd6 *ln = (struct llinfo_nd6 *)NULL; 125 struct rtentry *rt = NULL; 126 int is_newentry; 127 #endif 128 union nd_opts ndopts; 129 130 /* If I'm not a router, ignore it. */ 131 if (ip6_accept_rtadv != 0 || ip6_forwarding != 1) 132 goto freeit; 133 134 /* Sanity checks */ 135 if (ip6->ip6_hlim != 255) { 136 nd6log((LOG_ERR, 137 "nd6_rs_input: invalid hlim (%d) from %s to %s on %s\n", 138 ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src), 139 ip6_sprintf(&ip6->ip6_dst), if_name(ifp))); 140 goto bad; 141 } 142 143 /* 144 * Don't update the neighbor cache, if src = ::. 145 * This indicates that the src has no IP address assigned yet. 146 */ 147 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) 148 goto freeit; 149 150 #ifndef PULLDOWN_TEST 151 IP6_EXTHDR_CHECK(m, off, icmp6len,); 152 nd_rs = (struct nd_router_solicit *)((caddr_t)ip6 + off); 153 #else 154 IP6_EXTHDR_GET(nd_rs, struct nd_router_solicit *, m, off, icmp6len); 155 if (nd_rs == NULL) { 156 icmp6stat.icp6s_tooshort++; 157 return; 158 } 159 #endif 160 161 icmp6len -= sizeof(*nd_rs); 162 nd6_option_init(nd_rs + 1, icmp6len, &ndopts); 163 if (nd6_options(&ndopts) < 0) { 164 nd6log((LOG_INFO, 165 "nd6_rs_input: invalid ND option, ignored\n")); 166 /* nd6_options have incremented stats */ 167 goto freeit; 168 } 169 170 if (ndopts.nd_opts_src_lladdr) { 171 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1); 172 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3; 173 } 174 175 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 176 nd6log((LOG_INFO, 177 "nd6_rs_input: lladdrlen mismatch for %s " 178 "(if %d, RS packet %d)\n", 179 ip6_sprintf(&saddr6), ifp->if_addrlen, lladdrlen - 2)); 180 goto bad; 181 } 182 183 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_SOLICIT, 0); 184 185 freeit: 186 m_freem(m); 187 return; 188 189 bad: 190 icmp6stat.icp6s_badrs++; 191 m_freem(m); 192 } 193 194 /* 195 * Receive Router Advertisement Message. 196 * 197 * Based on RFC 2461 198 * TODO: on-link bit on prefix information 199 * TODO: ND_RA_FLAG_{OTHER,MANAGED} processing 200 */ 201 void 202 nd6_ra_input(m, off, icmp6len) 203 struct mbuf *m; 204 int off, icmp6len; 205 { 206 struct ifnet *ifp = m->m_pkthdr.rcvif; 207 struct nd_ifinfo *ndi = &nd_ifinfo[ifp->if_index]; 208 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 209 struct nd_router_advert *nd_ra; 210 struct in6_addr saddr6 = ip6->ip6_src; 211 #if 0 212 struct in6_addr daddr6 = ip6->ip6_dst; 213 int flags; /* = nd_ra->nd_ra_flags_reserved; */ 214 int is_managed = ((flags & ND_RA_FLAG_MANAGED) != 0); 215 int is_other = ((flags & ND_RA_FLAG_OTHER) != 0); 216 #endif 217 union nd_opts ndopts; 218 struct nd_defrouter *dr; 219 220 if (ip6_accept_rtadv == 0) 221 goto freeit; 222 223 if (ip6->ip6_hlim != 255) { 224 nd6log((LOG_ERR, 225 "nd6_ra_input: invalid hlim (%d) from %s to %s on %s\n", 226 ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src), 227 ip6_sprintf(&ip6->ip6_dst), if_name(ifp))); 228 goto bad; 229 } 230 231 if (!IN6_IS_ADDR_LINKLOCAL(&saddr6)) { 232 nd6log((LOG_ERR, 233 "nd6_ra_input: src %s is not link-local\n", 234 ip6_sprintf(&saddr6))); 235 goto bad; 236 } 237 238 #ifndef PULLDOWN_TEST 239 IP6_EXTHDR_CHECK(m, off, icmp6len,); 240 nd_ra = (struct nd_router_advert *)((caddr_t)ip6 + off); 241 #else 242 IP6_EXTHDR_GET(nd_ra, struct nd_router_advert *, m, off, icmp6len); 243 if (nd_ra == NULL) { 244 icmp6stat.icp6s_tooshort++; 245 return; 246 } 247 #endif 248 249 icmp6len -= sizeof(*nd_ra); 250 nd6_option_init(nd_ra + 1, icmp6len, &ndopts); 251 if (nd6_options(&ndopts) < 0) { 252 nd6log((LOG_INFO, 253 "nd6_ra_input: invalid ND option, ignored\n")); 254 /* nd6_options have incremented stats */ 255 goto freeit; 256 } 257 258 { 259 struct nd_defrouter dr0; 260 u_int32_t advreachable = nd_ra->nd_ra_reachable; 261 262 dr0.rtaddr = saddr6; 263 dr0.flags = nd_ra->nd_ra_flags_reserved; 264 dr0.rtlifetime = ntohs(nd_ra->nd_ra_router_lifetime); 265 dr0.expire = time_second + dr0.rtlifetime; 266 dr0.ifp = ifp; 267 dr0.advint = 0; /* Mobile IPv6 */ 268 dr0.advint_expire = 0; /* Mobile IPv6 */ 269 dr0.advints_lost = 0; /* Mobile IPv6 */ 270 /* unspecified or not? (RFC 2461 6.3.4) */ 271 if (advreachable) { 272 advreachable = ntohl(advreachable); 273 if (advreachable <= MAX_REACHABLE_TIME && 274 ndi->basereachable != advreachable) { 275 ndi->basereachable = advreachable; 276 ndi->reachable = ND_COMPUTE_RTIME(ndi->basereachable); 277 ndi->recalctm = nd6_recalc_reachtm_interval; /* reset */ 278 } 279 } 280 if (nd_ra->nd_ra_retransmit) 281 ndi->retrans = ntohl(nd_ra->nd_ra_retransmit); 282 if (nd_ra->nd_ra_curhoplimit) 283 ndi->chlim = nd_ra->nd_ra_curhoplimit; 284 dr = defrtrlist_update(&dr0); 285 } 286 287 /* 288 * prefix 289 */ 290 if (ndopts.nd_opts_pi) { 291 struct nd_opt_hdr *pt; 292 struct nd_opt_prefix_info *pi = NULL; 293 struct nd_prefix pr; 294 295 for (pt = (struct nd_opt_hdr *)ndopts.nd_opts_pi; 296 pt <= (struct nd_opt_hdr *)ndopts.nd_opts_pi_end; 297 pt = (struct nd_opt_hdr *)((caddr_t)pt + 298 (pt->nd_opt_len << 3))) { 299 if (pt->nd_opt_type != ND_OPT_PREFIX_INFORMATION) 300 continue; 301 pi = (struct nd_opt_prefix_info *)pt; 302 303 if (pi->nd_opt_pi_len != 4) { 304 nd6log((LOG_INFO, 305 "nd6_ra_input: invalid option " 306 "len %d for prefix information option, " 307 "ignored\n", pi->nd_opt_pi_len)); 308 continue; 309 } 310 311 if (128 < pi->nd_opt_pi_prefix_len) { 312 nd6log((LOG_INFO, 313 "nd6_ra_input: invalid prefix " 314 "len %d for prefix information option, " 315 "ignored\n", pi->nd_opt_pi_prefix_len)); 316 continue; 317 } 318 319 if (IN6_IS_ADDR_MULTICAST(&pi->nd_opt_pi_prefix) 320 || IN6_IS_ADDR_LINKLOCAL(&pi->nd_opt_pi_prefix)) { 321 nd6log((LOG_INFO, 322 "nd6_ra_input: invalid prefix " 323 "%s, ignored\n", 324 ip6_sprintf(&pi->nd_opt_pi_prefix))); 325 continue; 326 } 327 328 /* aggregatable unicast address, rfc2374 */ 329 if ((pi->nd_opt_pi_prefix.s6_addr8[0] & 0xe0) == 0x20 330 && pi->nd_opt_pi_prefix_len != 64) { 331 nd6log((LOG_INFO, 332 "nd6_ra_input: invalid prefixlen " 333 "%d for rfc2374 prefix %s, ignored\n", 334 pi->nd_opt_pi_prefix_len, 335 ip6_sprintf(&pi->nd_opt_pi_prefix))); 336 continue; 337 } 338 339 bzero(&pr, sizeof(pr)); 340 pr.ndpr_prefix.sin6_family = AF_INET6; 341 pr.ndpr_prefix.sin6_len = sizeof(pr.ndpr_prefix); 342 pr.ndpr_prefix.sin6_addr = pi->nd_opt_pi_prefix; 343 pr.ndpr_ifp = (struct ifnet *)m->m_pkthdr.rcvif; 344 345 pr.ndpr_raf_onlink = (pi->nd_opt_pi_flags_reserved & 346 ND_OPT_PI_FLAG_ONLINK) ? 1 : 0; 347 pr.ndpr_raf_auto = (pi->nd_opt_pi_flags_reserved & 348 ND_OPT_PI_FLAG_AUTO) ? 1 : 0; 349 pr.ndpr_plen = pi->nd_opt_pi_prefix_len; 350 pr.ndpr_vltime = ntohl(pi->nd_opt_pi_valid_time); 351 pr.ndpr_pltime = 352 ntohl(pi->nd_opt_pi_preferred_time); 353 354 if (in6_init_prefix_ltimes(&pr)) 355 continue; /* prefix lifetime init failed */ 356 357 (void)prelist_update(&pr, dr, m); 358 } 359 } 360 361 /* 362 * MTU 363 */ 364 if (ndopts.nd_opts_mtu && ndopts.nd_opts_mtu->nd_opt_mtu_len == 1) { 365 u_int32_t mtu = ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu); 366 367 /* lower bound */ 368 if (mtu < IPV6_MMTU) { 369 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu option " 370 "mtu=%d sent from %s, ignoring\n", 371 mtu, ip6_sprintf(&ip6->ip6_src))); 372 goto skip; 373 } 374 375 /* upper bound */ 376 if (ndi->maxmtu) { 377 if (mtu <= ndi->maxmtu) { 378 int change = (ndi->linkmtu != mtu); 379 380 ndi->linkmtu = mtu; 381 if (change) /* in6_maxmtu may change */ 382 in6_setmaxmtu(); 383 } else { 384 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu " 385 "mtu=%d sent from %s; " 386 "exceeds maxmtu %d, ignoring\n", 387 mtu, ip6_sprintf(&ip6->ip6_src), 388 ndi->maxmtu)); 389 } 390 } else { 391 nd6log((LOG_INFO, "nd6_ra_input: mtu option " 392 "mtu=%d sent from %s; maxmtu unknown, " 393 "ignoring\n", 394 mtu, ip6_sprintf(&ip6->ip6_src))); 395 } 396 } 397 398 skip: 399 400 /* 401 * Source link layer address 402 */ 403 { 404 char *lladdr = NULL; 405 int lladdrlen = 0; 406 407 if (ndopts.nd_opts_src_lladdr) { 408 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1); 409 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3; 410 } 411 412 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 413 nd6log((LOG_INFO, 414 "nd6_ra_input: lladdrlen mismatch for %s " 415 "(if %d, RA packet %d)\n", 416 ip6_sprintf(&saddr6), ifp->if_addrlen, lladdrlen - 2)); 417 goto bad; 418 } 419 420 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_ADVERT, 0); 421 422 /* 423 * Installing a link-layer address might change the state of the 424 * router's neighbor cache, which might also affect our on-link 425 * detection of adveritsed prefixes. 426 */ 427 pfxlist_onlink_check(); 428 } 429 430 freeit: 431 m_freem(m); 432 return; 433 434 bad: 435 icmp6stat.icp6s_badra++; 436 m_freem(m); 437 } 438 439 /* 440 * default router list proccessing sub routines 441 */ 442 443 /* tell the change to user processes watching the routing socket. */ 444 static void 445 nd6_rtmsg(cmd, rt) 446 int cmd; 447 struct rtentry *rt; 448 { 449 struct rt_addrinfo info; 450 451 bzero((caddr_t)&info, sizeof(info)); 452 info.rti_info[RTAX_DST] = rt_key(rt); 453 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 454 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 455 info.rti_info[RTAX_IFP] = 456 (struct sockaddr *)TAILQ_FIRST(&rt->rt_ifp->if_addrlist); 457 info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr; 458 459 rt_missmsg(cmd, &info, rt->rt_flags, 0); 460 } 461 462 void 463 defrouter_addreq(new) 464 struct nd_defrouter *new; 465 { 466 struct sockaddr_in6 def, mask, gate; 467 struct rtentry *newrt = NULL; 468 int s; 469 470 Bzero(&def, sizeof(def)); 471 Bzero(&mask, sizeof(mask)); 472 Bzero(&gate, sizeof(gate)); 473 474 def.sin6_len = mask.sin6_len = gate.sin6_len 475 = sizeof(struct sockaddr_in6); 476 def.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6; 477 gate.sin6_addr = new->rtaddr; 478 479 s = splnet(); 480 (void)rtrequest(RTM_ADD, (struct sockaddr *)&def, 481 (struct sockaddr *)&gate, (struct sockaddr *)&mask, 482 RTF_GATEWAY, &newrt); 483 if (newrt) { 484 nd6_rtmsg(RTM_ADD, newrt); /* tell user process */ 485 newrt->rt_refcnt--; 486 } 487 splx(s); 488 return; 489 } 490 491 /* Add a route to a given interface as default */ 492 void 493 defrouter_addifreq(ifp) 494 struct ifnet *ifp; 495 { 496 struct sockaddr_in6 def, mask; 497 struct ifaddr *ifa; 498 struct rtentry *newrt = NULL; 499 int error, flags; 500 501 bzero(&def, sizeof(def)); 502 bzero(&mask, sizeof(mask)); 503 504 def.sin6_len = mask.sin6_len = sizeof(struct sockaddr_in6); 505 def.sin6_family = mask.sin6_family = AF_INET6; 506 507 /* 508 * Search for an ifaddr beloging to the specified interface. 509 * XXX: An IPv6 address are required to be assigned on the interface. 510 */ 511 if ((ifa = ifaof_ifpforaddr((struct sockaddr *)&def, ifp)) == NULL) { 512 nd6log((LOG_ERR, /* better error? */ 513 "defrouter_addifreq: failed to find an ifaddr " 514 "to install a route to interface %s\n", 515 if_name(ifp))); 516 return; 517 } 518 519 flags = ifa->ifa_flags; 520 error = rtrequest(RTM_ADD, (struct sockaddr *)&def, ifa->ifa_addr, 521 (struct sockaddr *)&mask, flags, &newrt); 522 if (error != 0) { 523 nd6log((LOG_ERR, 524 "defrouter_addifreq: failed to install a route to " 525 "interface %s (errno = %d)\n", 526 if_name(ifp), error)); 527 528 if (newrt) /* maybe unnecessary, but do it for safety */ 529 newrt->rt_refcnt--; 530 } else { 531 if (newrt) { 532 nd6_rtmsg(RTM_ADD, newrt); 533 newrt->rt_refcnt--; 534 } 535 } 536 } 537 538 struct nd_defrouter * 539 defrouter_lookup(addr, ifp) 540 struct in6_addr *addr; 541 struct ifnet *ifp; 542 { 543 struct nd_defrouter *dr; 544 545 for (dr = TAILQ_FIRST(&nd_defrouter); dr; 546 dr = TAILQ_NEXT(dr, dr_entry)) { 547 if (dr->ifp == ifp && IN6_ARE_ADDR_EQUAL(addr, &dr->rtaddr)) 548 return(dr); 549 } 550 551 return(NULL); /* search failed */ 552 } 553 554 void 555 defrouter_delreq(dr, dofree) 556 struct nd_defrouter *dr; 557 int dofree; 558 { 559 struct sockaddr_in6 def, mask, gate; 560 struct rtentry *oldrt = NULL; 561 562 Bzero(&def, sizeof(def)); 563 Bzero(&mask, sizeof(mask)); 564 Bzero(&gate, sizeof(gate)); 565 566 def.sin6_len = mask.sin6_len = gate.sin6_len 567 = sizeof(struct sockaddr_in6); 568 def.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6; 569 gate.sin6_addr = dr->rtaddr; 570 571 rtrequest(RTM_DELETE, (struct sockaddr *)&def, 572 (struct sockaddr *)&gate, 573 (struct sockaddr *)&mask, 574 RTF_GATEWAY, &oldrt); 575 if (oldrt) { 576 nd6_rtmsg(RTM_DELETE, oldrt); 577 RTFREE(oldrt); 578 } 579 580 if (dofree) /* XXX: necessary? */ 581 free(dr, M_IP6NDP); 582 } 583 584 void 585 defrtrlist_del(dr) 586 struct nd_defrouter *dr; 587 { 588 struct nd_defrouter *deldr = NULL; 589 struct nd_prefix *pr; 590 591 /* 592 * Flush all the routing table entries that use the router 593 * as a next hop. 594 */ 595 if (!ip6_forwarding && ip6_accept_rtadv) { 596 /* above is a good condition? */ 597 rt6_flush(&dr->rtaddr, dr->ifp); 598 } 599 600 if (dr == TAILQ_FIRST(&nd_defrouter)) 601 deldr = dr; /* The router is primary. */ 602 603 TAILQ_REMOVE(&nd_defrouter, dr, dr_entry); 604 605 /* 606 * Also delete all the pointers to the router in each prefix lists. 607 */ 608 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 609 struct nd_pfxrouter *pfxrtr; 610 if ((pfxrtr = pfxrtr_lookup(pr, dr)) != NULL) 611 pfxrtr_del(pfxrtr); 612 } 613 pfxlist_onlink_check(); 614 615 /* 616 * If the router is the primary one, choose a new one. 617 * Note that defrouter_select() will remove the current gateway 618 * from the routing table. 619 */ 620 if (deldr) 621 defrouter_select(); 622 623 free(dr, M_IP6NDP); 624 } 625 626 /* 627 * Default Router Selection according to Section 6.3.6 of RFC 2461: 628 * 1) Routers that are reachable or probably reachable should be 629 * preferred. 630 * 2) When no routers on the list are known to be reachable or 631 * probably reachable, routers SHOULD be selected in a round-robin 632 * fashion. 633 * 3) If the Default Router List is empty, assume that all 634 * destinations are on-link. 635 */ 636 void 637 defrouter_select() 638 { 639 int s = splnet(); 640 struct nd_defrouter *dr, anydr; 641 struct rtentry *rt = NULL; 642 struct llinfo_nd6 *ln = NULL; 643 644 /* 645 * Search for a (probably) reachable router from the list. 646 */ 647 for (dr = TAILQ_FIRST(&nd_defrouter); dr; 648 dr = TAILQ_NEXT(dr, dr_entry)) { 649 if ((rt = nd6_lookup(&dr->rtaddr, 0, dr->ifp)) && 650 (ln = (struct llinfo_nd6 *)rt->rt_llinfo) && 651 ND6_IS_LLINFO_PROBREACH(ln)) { 652 /* Got it, and move it to the head */ 653 TAILQ_REMOVE(&nd_defrouter, dr, dr_entry); 654 TAILQ_INSERT_HEAD(&nd_defrouter, dr, dr_entry); 655 break; 656 } 657 } 658 659 if ((dr = TAILQ_FIRST(&nd_defrouter))) { 660 /* 661 * De-install the previous default gateway and install 662 * a new one. 663 * Note that if there is no reachable router in the list, 664 * the head entry will be used anyway. 665 * XXX: do we have to check the current routing table entry? 666 */ 667 bzero(&anydr, sizeof(anydr)); 668 defrouter_delreq(&anydr, 0); 669 defrouter_addreq(dr); 670 } 671 else { 672 /* 673 * The Default Router List is empty, so install the default 674 * route to an inteface. 675 * XXX: The specification does not say this mechanism should 676 * be restricted to hosts, but this would be not useful 677 * (even harmful) for routers. 678 */ 679 if (!ip6_forwarding) { 680 /* 681 * De-install the current default route 682 * in advance. 683 */ 684 bzero(&anydr, sizeof(anydr)); 685 defrouter_delreq(&anydr, 0); 686 if (nd6_defifp) { 687 /* 688 * Install a route to the default interface 689 * as default route. 690 * XXX: we enable this for host only, because 691 * this may override a default route installed 692 * a user process (e.g. routing daemon) in a 693 * router case. 694 */ 695 defrouter_addifreq(nd6_defifp); 696 } else { 697 nd6log((LOG_INFO, "defrouter_select: " 698 "there's no default router and no default" 699 " interface\n")); 700 } 701 } 702 } 703 704 splx(s); 705 return; 706 } 707 708 static struct nd_defrouter * 709 defrtrlist_update(new) 710 struct nd_defrouter *new; 711 { 712 struct nd_defrouter *dr, *n; 713 int s = splnet(); 714 715 if ((dr = defrouter_lookup(&new->rtaddr, new->ifp)) != NULL) { 716 /* entry exists */ 717 if (new->rtlifetime == 0) { 718 defrtrlist_del(dr); 719 dr = NULL; 720 } else { 721 /* override */ 722 dr->flags = new->flags; /* xxx flag check */ 723 dr->rtlifetime = new->rtlifetime; 724 dr->expire = new->expire; 725 } 726 splx(s); 727 return(dr); 728 } 729 730 /* entry does not exist */ 731 if (new->rtlifetime == 0) { 732 splx(s); 733 return(NULL); 734 } 735 736 n = (struct nd_defrouter *)malloc(sizeof(*n), M_IP6NDP, M_NOWAIT); 737 if (n == NULL) { 738 splx(s); 739 return(NULL); 740 } 741 bzero(n, sizeof(*n)); 742 *n = *new; 743 744 /* 745 * Insert the new router at the end of the Default Router List. 746 * If there is no other router, install it anyway. Otherwise, 747 * just continue to use the current default router. 748 */ 749 TAILQ_INSERT_TAIL(&nd_defrouter, n, dr_entry); 750 if (TAILQ_FIRST(&nd_defrouter) == n) 751 defrouter_select(); 752 splx(s); 753 754 return(n); 755 } 756 757 static struct nd_pfxrouter * 758 pfxrtr_lookup(pr, dr) 759 struct nd_prefix *pr; 760 struct nd_defrouter *dr; 761 { 762 struct nd_pfxrouter *search; 763 764 for (search = pr->ndpr_advrtrs.lh_first; search; search = search->pfr_next) { 765 if (search->router == dr) 766 break; 767 } 768 769 return(search); 770 } 771 772 static void 773 pfxrtr_add(pr, dr) 774 struct nd_prefix *pr; 775 struct nd_defrouter *dr; 776 { 777 struct nd_pfxrouter *new; 778 779 new = (struct nd_pfxrouter *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT); 780 if (new == NULL) 781 return; 782 bzero(new, sizeof(*new)); 783 new->router = dr; 784 785 LIST_INSERT_HEAD(&pr->ndpr_advrtrs, new, pfr_entry); 786 787 pfxlist_onlink_check(); 788 } 789 790 static void 791 pfxrtr_del(pfr) 792 struct nd_pfxrouter *pfr; 793 { 794 LIST_REMOVE(pfr, pfr_entry); 795 free(pfr, M_IP6NDP); 796 } 797 798 struct nd_prefix * 799 nd6_prefix_lookup(pr) 800 struct nd_prefix *pr; 801 { 802 struct nd_prefix *search; 803 804 for (search = nd_prefix.lh_first; search; search = search->ndpr_next) { 805 if (pr->ndpr_ifp == search->ndpr_ifp && 806 pr->ndpr_plen == search->ndpr_plen && 807 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr, 808 &search->ndpr_prefix.sin6_addr, 809 pr->ndpr_plen) 810 ) { 811 break; 812 } 813 } 814 815 return(search); 816 } 817 818 int 819 nd6_prelist_add(pr, dr, newp) 820 struct nd_prefix *pr, **newp; 821 struct nd_defrouter *dr; 822 { 823 struct nd_prefix *new = NULL; 824 int i, s; 825 826 new = (struct nd_prefix *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT); 827 if (new == NULL) 828 return ENOMEM; 829 bzero(new, sizeof(*new)); 830 *new = *pr; 831 if (newp != NULL) 832 *newp = new; 833 834 /* initilization */ 835 LIST_INIT(&new->ndpr_advrtrs); 836 in6_prefixlen2mask(&new->ndpr_mask, new->ndpr_plen); 837 /* make prefix in the canonical form */ 838 for (i = 0; i < 4; i++) 839 new->ndpr_prefix.sin6_addr.s6_addr32[i] &= 840 new->ndpr_mask.s6_addr32[i]; 841 842 s = splnet(); 843 /* link ndpr_entry to nd_prefix list */ 844 LIST_INSERT_HEAD(&nd_prefix, new, ndpr_entry); 845 splx(s); 846 847 /* ND_OPT_PI_FLAG_ONLINK processing */ 848 if (new->ndpr_raf_onlink) { 849 int e; 850 851 if ((e = nd6_prefix_onlink(new)) != 0) { 852 nd6log((LOG_ERR, "nd6_prelist_add: failed to make " 853 "the prefix %s/%d on-link on %s (errno=%d)\n", 854 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 855 pr->ndpr_plen, if_name(pr->ndpr_ifp), e)); 856 /* proceed anyway. XXX: is it correct? */ 857 } 858 } 859 860 if (dr) { 861 pfxrtr_add(new, dr); 862 } 863 864 return 0; 865 } 866 867 void 868 prelist_remove(pr) 869 struct nd_prefix *pr; 870 { 871 struct nd_pfxrouter *pfr, *next; 872 int e, s; 873 874 /* make sure to invalidate the prefix until it is really freed. */ 875 pr->ndpr_vltime = 0; 876 pr->ndpr_pltime = 0; 877 #if 0 878 /* 879 * Though these flags are now meaningless, we'd rather keep the value 880 * not to confuse users when executing "ndp -p". 881 */ 882 pr->ndpr_raf_onlink = 0; 883 pr->ndpr_raf_auto = 0; 884 #endif 885 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0 && 886 (e = nd6_prefix_offlink(pr)) != 0) { 887 nd6log((LOG_ERR, "prelist_remove: failed to make %s/%d offlink " 888 "on %s, errno=%d\n", 889 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 890 pr->ndpr_plen, if_name(pr->ndpr_ifp), e)); 891 /* what should we do? */ 892 } 893 894 if (pr->ndpr_refcnt > 0) 895 return; /* notice here? */ 896 897 s = splnet(); 898 899 /* unlink ndpr_entry from nd_prefix list */ 900 LIST_REMOVE(pr, ndpr_entry); 901 902 /* free list of routers that adversed the prefix */ 903 for (pfr = pr->ndpr_advrtrs.lh_first; pfr; pfr = next) { 904 next = pfr->pfr_next; 905 906 free(pfr, M_IP6NDP); 907 } 908 splx(s); 909 910 free(pr, M_IP6NDP); 911 912 pfxlist_onlink_check(); 913 } 914 915 int 916 prelist_update(new, dr, m) 917 struct nd_prefix *new; 918 struct nd_defrouter *dr; /* may be NULL */ 919 struct mbuf *m; 920 { 921 struct in6_ifaddr *ia6 = NULL, *ia6_match = NULL; 922 struct ifaddr *ifa; 923 struct ifnet *ifp = new->ndpr_ifp; 924 struct nd_prefix *pr; 925 int s = splnet(); 926 int error = 0; 927 int newprefix = 0; 928 int auth; 929 struct in6_addrlifetime lt6_tmp; 930 931 auth = 0; 932 if (m) { 933 /* 934 * Authenticity for NA consists authentication for 935 * both IP header and IP datagrams, doesn't it ? 936 */ 937 #if defined(M_AUTHIPHDR) && defined(M_AUTHIPDGM) 938 auth = (m->m_flags & M_AUTHIPHDR 939 && m->m_flags & M_AUTHIPDGM) ? 1 : 0; 940 #endif 941 } 942 943 944 if ((pr = nd6_prefix_lookup(new)) != NULL) { 945 /* 946 * nd6_prefix_lookup() ensures that pr and new have the same 947 * prefix on a same interface. 948 */ 949 950 /* 951 * Update prefix information. Note that the on-link (L) bit 952 * and the autonomous (A) bit should NOT be changed from 1 953 * to 0. 954 */ 955 if (new->ndpr_raf_onlink == 1) 956 pr->ndpr_raf_onlink = 1; 957 if (new->ndpr_raf_auto == 1) 958 pr->ndpr_raf_auto = 1; 959 if (new->ndpr_raf_onlink) { 960 pr->ndpr_vltime = new->ndpr_vltime; 961 pr->ndpr_pltime = new->ndpr_pltime; 962 pr->ndpr_preferred = new->ndpr_preferred; 963 pr->ndpr_expire = new->ndpr_expire; 964 } 965 966 if (new->ndpr_raf_onlink && 967 (pr->ndpr_stateflags & NDPRF_ONLINK) == 0) { 968 int e; 969 970 if ((e = nd6_prefix_onlink(pr)) != 0) { 971 nd6log((LOG_ERR, 972 "prelist_update: failed to make " 973 "the prefix %s/%d on-link on %s " 974 "(errno=%d)\n", 975 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 976 pr->ndpr_plen, if_name(pr->ndpr_ifp), e)); 977 /* proceed anyway. XXX: is it correct? */ 978 } 979 } 980 981 if (dr && pfxrtr_lookup(pr, dr) == NULL) 982 pfxrtr_add(pr, dr); 983 } else { 984 struct nd_prefix *newpr = NULL; 985 986 newprefix = 1; 987 988 if (new->ndpr_vltime == 0) 989 goto end; 990 if (new->ndpr_raf_onlink == 0 && new->ndpr_raf_auto == 0) 991 goto end; 992 993 bzero(&new->ndpr_addr, sizeof(struct in6_addr)); 994 995 error = nd6_prelist_add(new, dr, &newpr); 996 if (error != 0 || newpr == NULL) { 997 nd6log((LOG_NOTICE, "prelist_update: " 998 "nd6_prelist_add failed for %s/%d on %s " 999 "errno=%d, returnpr=%p\n", 1000 ip6_sprintf(&new->ndpr_prefix.sin6_addr), 1001 new->ndpr_plen, if_name(new->ndpr_ifp), 1002 error, newpr)); 1003 goto end; /* we should just give up in this case. */ 1004 } 1005 1006 /* 1007 * XXX: from the ND point of view, we can ignore a prefix 1008 * with the on-link bit being zero. However, we need a 1009 * prefix structure for references from autoconfigured 1010 * addresses. Thus, we explicitly make suret that the prefix 1011 * itself expires now. 1012 */ 1013 if (newpr->ndpr_raf_onlink == 0) { 1014 newpr->ndpr_vltime = 0; 1015 newpr->ndpr_pltime = 0; 1016 in6_init_prefix_ltimes(newpr); 1017 } 1018 1019 pr = newpr; 1020 } 1021 1022 /* 1023 * Address autoconfiguration based on Section 5.5.3 of RFC 2462. 1024 * Note that pr must be non NULL at this point. 1025 */ 1026 1027 /* 5.5.3 (a). Ignore the prefix without the A bit set. */ 1028 if (!new->ndpr_raf_auto) 1029 goto afteraddrconf; 1030 1031 /* 1032 * 5.5.3 (b). the link-local prefix should have been ignored in 1033 * nd6_ra_input. 1034 */ 1035 1036 /* 1037 * 5.5.3 (c). Consistency check on lifetimes: pltime <= vltime. 1038 * This should have been done in nd6_ra_input. 1039 */ 1040 1041 /* 1042 * 5.5.3 (d). If the prefix advertised does not match the prefix of an 1043 * address already in the list, and the Valid Lifetime is not 0, 1044 * form an address. Note that even a manually configured address 1045 * should reject autoconfiguration of a new address. 1046 */ 1047 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 1048 { 1049 struct in6_ifaddr *ifa6; 1050 int ifa_plen; 1051 u_int32_t storedlifetime; 1052 1053 if (ifa->ifa_addr->sa_family != AF_INET6) 1054 continue; 1055 1056 ifa6 = (struct in6_ifaddr *)ifa; 1057 1058 /* 1059 * Spec is not clear here, but I believe we should concentrate 1060 * on unicast (i.e. not anycast) addresses. 1061 * XXX: other ia6_flags? detached or duplicated? 1062 */ 1063 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0) 1064 continue; 1065 1066 ifa_plen = in6_mask2len(&ifa6->ia_prefixmask.sin6_addr, NULL); 1067 if (ifa_plen != new->ndpr_plen || 1068 !in6_are_prefix_equal(&ifa6->ia_addr.sin6_addr, 1069 &new->ndpr_prefix.sin6_addr, 1070 ifa_plen)) 1071 continue; 1072 1073 if (ia6_match == NULL) /* remember the first one */ 1074 ia6_match = ifa6; 1075 1076 if ((ifa6->ia6_flags & IN6_IFF_AUTOCONF) == 0) 1077 continue; 1078 1079 /* 1080 * An already autoconfigured address matched. Now that we 1081 * are sure there is at least one matched address, we can 1082 * proceed to 5.5.3. (e): update the lifetimes according to the 1083 * "two hours" rule and the privacy extension. 1084 */ 1085 #define TWOHOUR (120*60) 1086 lt6_tmp = ifa6->ia6_lifetime; 1087 1088 storedlifetime = IFA6_IS_INVALID(ifa6) ? 0 : 1089 (lt6_tmp.ia6t_expire - time_second); 1090 1091 if (TWOHOUR < new->ndpr_vltime || 1092 storedlifetime < new->ndpr_vltime) { 1093 lt6_tmp.ia6t_vltime = new->ndpr_vltime; 1094 } else if (storedlifetime <= TWOHOUR 1095 #if 0 1096 /* 1097 * This condition is logically redundant, so we just 1098 * omit it. 1099 * See IPng 6712, 6717, and 6721. 1100 */ 1101 && new->ndpr_vltime <= storedlifetime 1102 #endif 1103 ) { 1104 if (auth) { 1105 lt6_tmp.ia6t_vltime = new->ndpr_vltime; 1106 } 1107 } else { 1108 /* 1109 * new->ndpr_vltime <= TWOHOUR && 1110 * TWOHOUR < storedlifetime 1111 */ 1112 lt6_tmp.ia6t_vltime = TWOHOUR; 1113 } 1114 1115 /* The 2 hour rule is not imposed for preferred lifetime. */ 1116 lt6_tmp.ia6t_pltime = new->ndpr_pltime; 1117 1118 in6_init_address_ltimes(pr, <6_tmp); 1119 1120 /* 1121 * When adjusting the lifetimes of an existing temporary 1122 * address, only lower the lifetimes. 1123 * RFC 3041 3.3. (1). 1124 * XXX: how should we modify ia6t_[pv]ltime? 1125 */ 1126 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0) { 1127 if (lt6_tmp.ia6t_expire == 0 || /* no expire */ 1128 lt6_tmp.ia6t_expire > 1129 ifa6->ia6_lifetime.ia6t_expire) { 1130 lt6_tmp.ia6t_expire = 1131 ifa6->ia6_lifetime.ia6t_expire; 1132 } 1133 if (lt6_tmp.ia6t_preferred == 0 || /* no expire */ 1134 lt6_tmp.ia6t_preferred > 1135 ifa6->ia6_lifetime.ia6t_preferred) { 1136 lt6_tmp.ia6t_preferred = 1137 ifa6->ia6_lifetime.ia6t_preferred; 1138 } 1139 } 1140 1141 ifa6->ia6_lifetime = lt6_tmp; 1142 } 1143 if (ia6_match == NULL && new->ndpr_vltime) { 1144 /* 1145 * No address matched and the valid lifetime is non-zero. 1146 * Create a new address. 1147 */ 1148 if ((ia6 = in6_ifadd(new, NULL)) != NULL) { 1149 /* 1150 * note that we should use pr (not new) for reference. 1151 */ 1152 pr->ndpr_refcnt++; 1153 ia6->ia6_ndpr = pr; 1154 1155 #if 0 1156 /* XXXYYY Don't do this, according to Jinmei. */ 1157 pr->ndpr_addr = new->ndpr_addr; 1158 #endif 1159 1160 /* 1161 * RFC 3041 3.3 (2). 1162 * When a new public address is created as described 1163 * in RFC2462, also create a new temporary address. 1164 * 1165 * RFC 3041 3.5. 1166 * When an interface connects to a new link, a new 1167 * randomized interface identifier should be generated 1168 * immediately together with a new set of temporary 1169 * addresses. Thus, we specifiy 1 as the 2nd arg of 1170 * in6_tmpifadd(). 1171 */ 1172 if (ip6_use_tempaddr) { 1173 int e; 1174 if ((e = in6_tmpifadd(ia6, 1)) != 0) { 1175 nd6log((LOG_NOTICE, "prelist_update: " 1176 "failed to create a temporary " 1177 "address, errno=%d\n", 1178 e)); 1179 } 1180 } 1181 1182 /* 1183 * A newly added address might affect the status 1184 * of other addresses, so we check and update it. 1185 * XXX: what if address duplication happens? 1186 */ 1187 pfxlist_onlink_check(); 1188 } else { 1189 /* just set an error. do not bark here. */ 1190 error = EADDRNOTAVAIL; /* XXX: might be unused. */ 1191 } 1192 } 1193 1194 afteraddrconf: 1195 1196 end: 1197 splx(s); 1198 return error; 1199 } 1200 1201 /* 1202 * A supplement function used in the on-link detection below; 1203 * detect if a given prefix has a (probably) reachable advertising router. 1204 * XXX: lengthy function name... 1205 */ 1206 static struct nd_pfxrouter * 1207 find_pfxlist_reachable_router(pr) 1208 struct nd_prefix *pr; 1209 { 1210 struct nd_pfxrouter *pfxrtr; 1211 struct rtentry *rt; 1212 struct llinfo_nd6 *ln; 1213 1214 for (pfxrtr = LIST_FIRST(&pr->ndpr_advrtrs); pfxrtr; 1215 pfxrtr = LIST_NEXT(pfxrtr, pfr_entry)) { 1216 if ((rt = nd6_lookup(&pfxrtr->router->rtaddr, 0, 1217 pfxrtr->router->ifp)) && 1218 (ln = (struct llinfo_nd6 *)rt->rt_llinfo) && 1219 ND6_IS_LLINFO_PROBREACH(ln)) 1220 break; /* found */ 1221 } 1222 1223 return(pfxrtr); 1224 1225 } 1226 1227 /* 1228 * Check if each prefix in the prefix list has at least one available router 1229 * that advertised the prefix (a router is "available" if its neighbor cache 1230 * entry is reachable or probably reachable). 1231 * If the check fails, the prefix may be off-link, because, for example, 1232 * we have moved from the network but the lifetime of the prefix has not 1233 * expired yet. So we should not use the prefix if there is another prefix 1234 * that has an available router. 1235 * But, if there is no prefix that has an available router, we still regards 1236 * all the prefixes as on-link. This is because we can't tell if all the 1237 * routers are simply dead or if we really moved from the network and there 1238 * is no router around us. 1239 */ 1240 void 1241 pfxlist_onlink_check() 1242 { 1243 struct nd_prefix *pr; 1244 struct in6_ifaddr *ifa; 1245 1246 /* 1247 * Check if there is a prefix that has a reachable advertising 1248 * router. 1249 */ 1250 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 1251 if (pr->ndpr_raf_onlink && find_pfxlist_reachable_router(pr)) 1252 break; 1253 } 1254 1255 if (pr) { 1256 /* 1257 * There is at least one prefix that has a reachable router. 1258 * Detach prefixes which have no reachable advertising 1259 * router, and attach other prefixes. 1260 */ 1261 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 1262 /* XXX: a link-local prefix should never be detached */ 1263 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr)) 1264 continue; 1265 1266 /* 1267 * we aren't interested in prefixes without the L bit 1268 * set. 1269 */ 1270 if (pr->ndpr_raf_onlink == 0) 1271 continue; 1272 1273 if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 && 1274 find_pfxlist_reachable_router(pr) == NULL) 1275 pr->ndpr_stateflags |= NDPRF_DETACHED; 1276 if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 && 1277 find_pfxlist_reachable_router(pr) != 0) 1278 pr->ndpr_stateflags &= ~NDPRF_DETACHED; 1279 } 1280 } else { 1281 /* there is no prefix that has a reachable router */ 1282 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 1283 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr)) 1284 continue; 1285 1286 if (pr->ndpr_raf_onlink == 0) 1287 continue; 1288 1289 if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0) 1290 pr->ndpr_stateflags &= ~NDPRF_DETACHED; 1291 } 1292 } 1293 1294 /* 1295 * Remove each interface route associated with a (just) detached 1296 * prefix, and reinstall the interface route for a (just) attached 1297 * prefix. Note that all attempt of reinstallation does not 1298 * necessarily success, when a same prefix is shared among multiple 1299 * interfaces. Such cases will be handled in nd6_prefix_onlink, 1300 * so we don't have to care about them. 1301 */ 1302 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 1303 int e; 1304 1305 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr)) 1306 continue; 1307 1308 if (pr->ndpr_raf_onlink == 0) 1309 continue; 1310 1311 if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 && 1312 (pr->ndpr_stateflags & NDPRF_ONLINK) != 0) { 1313 if ((e = nd6_prefix_offlink(pr)) != 0) { 1314 nd6log((LOG_ERR, 1315 "pfxlist_onlink_check: failed to " 1316 "make %s/%d offlink, errno=%d\n", 1317 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 1318 pr->ndpr_plen, e)); 1319 } 1320 } 1321 if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 && 1322 (pr->ndpr_stateflags & NDPRF_ONLINK) == 0 && 1323 pr->ndpr_raf_onlink) { 1324 if ((e = nd6_prefix_onlink(pr)) != 0) { 1325 nd6log((LOG_ERR, 1326 "pfxlist_onlink_check: failed to " 1327 "make %s/%d offlink, errno=%d\n", 1328 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 1329 pr->ndpr_plen, e)); 1330 } 1331 } 1332 } 1333 1334 /* 1335 * Changes on the prefix status might affect address status as well. 1336 * Make sure that all addresses derived from an attached prefix are 1337 * attached, and that all addresses derived from a detached prefix are 1338 * detached. Note, however, that a manually configured address should 1339 * always be attached. 1340 * The precise detection logic is same as the one for prefixes. 1341 */ 1342 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) { 1343 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0) 1344 continue; 1345 1346 if (ifa->ia6_ndpr == NULL) { 1347 /* 1348 * This can happen when we first configure the address 1349 * (i.e. the address exists, but the prefix does not). 1350 * XXX: complicated relationships... 1351 */ 1352 continue; 1353 } 1354 1355 if (find_pfxlist_reachable_router(ifa->ia6_ndpr)) 1356 break; 1357 } 1358 if (ifa) { 1359 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) { 1360 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0) 1361 continue; 1362 1363 if (ifa->ia6_ndpr == NULL) /* XXX: see above. */ 1364 continue; 1365 1366 if (find_pfxlist_reachable_router(ifa->ia6_ndpr)) 1367 ifa->ia6_flags &= ~IN6_IFF_DETACHED; 1368 else 1369 ifa->ia6_flags |= IN6_IFF_DETACHED; 1370 } 1371 } 1372 else { 1373 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) { 1374 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0) 1375 continue; 1376 1377 ifa->ia6_flags &= ~IN6_IFF_DETACHED; 1378 } 1379 } 1380 } 1381 1382 int 1383 nd6_prefix_onlink(pr) 1384 struct nd_prefix *pr; 1385 { 1386 struct ifaddr *ifa; 1387 struct ifnet *ifp = pr->ndpr_ifp; 1388 struct sockaddr_in6 mask6; 1389 struct nd_prefix *opr; 1390 u_long rtflags; 1391 int error = 0; 1392 struct rtentry *rt = NULL; 1393 1394 /* sanity check */ 1395 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0) { 1396 nd6log((LOG_ERR, 1397 "nd6_prefix_onlink: %s/%d is already on-link\n", 1398 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen); 1399 return(EEXIST)); 1400 } 1401 1402 /* 1403 * Add the interface route associated with the prefix. Before 1404 * installing the route, check if there's the same prefix on another 1405 * interface, and the prefix has already installed the interface route. 1406 * Although such a configuration is expected to be rare, we explicitly 1407 * allow it. 1408 */ 1409 for (opr = nd_prefix.lh_first; opr; opr = opr->ndpr_next) { 1410 if (opr == pr) 1411 continue; 1412 1413 if ((opr->ndpr_stateflags & NDPRF_ONLINK) == 0) 1414 continue; 1415 1416 if (opr->ndpr_plen == pr->ndpr_plen && 1417 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr, 1418 &opr->ndpr_prefix.sin6_addr, 1419 pr->ndpr_plen)) 1420 return(0); 1421 } 1422 1423 /* 1424 * We prefer link-local addresses as the associated interface address. 1425 */ 1426 /* search for a link-local addr */ 1427 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 1428 IN6_IFF_NOTREADY| 1429 IN6_IFF_ANYCAST); 1430 if (ifa == NULL) { 1431 /* XXX: freebsd does not have ifa_ifwithaf */ 1432 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 1433 { 1434 if (ifa->ifa_addr->sa_family == AF_INET6) 1435 break; 1436 } 1437 /* should we care about ia6_flags? */ 1438 } 1439 if (ifa == NULL) { 1440 /* 1441 * This can still happen, when, for example, we receive an RA 1442 * containing a prefix with the L bit set and the A bit clear, 1443 * after removing all IPv6 addresses on the receiving 1444 * interface. This should, of course, be rare though. 1445 */ 1446 nd6log((LOG_NOTICE, 1447 "nd6_prefix_onlink: failed to find any ifaddr" 1448 " to add route for a prefix(%s/%d) on %s\n", 1449 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 1450 pr->ndpr_plen, if_name(ifp))); 1451 return(0); 1452 } 1453 1454 /* 1455 * in6_ifinit() sets nd6_rtrequest to ifa_rtrequest for all ifaddrs. 1456 * ifa->ifa_rtrequest = nd6_rtrequest; 1457 */ 1458 bzero(&mask6, sizeof(mask6)); 1459 mask6.sin6_len = sizeof(mask6); 1460 mask6.sin6_addr = pr->ndpr_mask; 1461 rtflags = ifa->ifa_flags | RTF_CLONING | RTF_UP; 1462 if (nd6_need_cache(ifp)) { 1463 /* explicitly set in case ifa_flags does not set the flag. */ 1464 rtflags |= RTF_CLONING; 1465 } else { 1466 /* 1467 * explicitly clear the cloning bit in case ifa_flags sets it. 1468 */ 1469 rtflags &= ~RTF_CLONING; 1470 } 1471 error = rtrequest(RTM_ADD, (struct sockaddr *)&pr->ndpr_prefix, 1472 ifa->ifa_addr, (struct sockaddr *)&mask6, 1473 rtflags, &rt); 1474 if (error == 0) { 1475 if (rt != NULL) /* this should be non NULL, though */ 1476 nd6_rtmsg(RTM_ADD, rt); 1477 pr->ndpr_stateflags |= NDPRF_ONLINK; 1478 } 1479 else { 1480 nd6log((LOG_ERR, "nd6_prefix_onlink: failed to add route for a" 1481 " prefix (%s/%d) on %s, gw=%s, mask=%s, flags=%lx " 1482 "errno = %d\n", 1483 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 1484 pr->ndpr_plen, if_name(ifp), 1485 ip6_sprintf(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr), 1486 ip6_sprintf(&mask6.sin6_addr), rtflags, error)); 1487 } 1488 1489 if (rt != NULL) 1490 rt->rt_refcnt--; 1491 1492 return(error); 1493 } 1494 1495 int 1496 nd6_prefix_offlink(pr) 1497 struct nd_prefix *pr; 1498 { 1499 int error = 0; 1500 struct ifnet *ifp = pr->ndpr_ifp; 1501 struct nd_prefix *opr; 1502 struct sockaddr_in6 sa6, mask6; 1503 struct rtentry *rt = NULL; 1504 1505 /* sanity check */ 1506 if ((pr->ndpr_stateflags & NDPRF_ONLINK) == 0) { 1507 nd6log((LOG_ERR, 1508 "nd6_prefix_offlink: %s/%d is already off-link\n", 1509 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen)); 1510 return(EEXIST); 1511 } 1512 1513 bzero(&sa6, sizeof(sa6)); 1514 sa6.sin6_family = AF_INET6; 1515 sa6.sin6_len = sizeof(sa6); 1516 bcopy(&pr->ndpr_prefix.sin6_addr, &sa6.sin6_addr, 1517 sizeof(struct in6_addr)); 1518 bzero(&mask6, sizeof(mask6)); 1519 mask6.sin6_family = AF_INET6; 1520 mask6.sin6_len = sizeof(sa6); 1521 bcopy(&pr->ndpr_mask, &mask6.sin6_addr, sizeof(struct in6_addr)); 1522 error = rtrequest(RTM_DELETE, (struct sockaddr *)&sa6, NULL, 1523 (struct sockaddr *)&mask6, 0, &rt); 1524 if (error == 0) { 1525 pr->ndpr_stateflags &= ~NDPRF_ONLINK; 1526 1527 /* report the route deletion to the routing socket. */ 1528 if (rt != NULL) 1529 nd6_rtmsg(RTM_DELETE, rt); 1530 1531 /* 1532 * There might be the same prefix on another interface, 1533 * the prefix which could not be on-link just because we have 1534 * the interface route (see comments in nd6_prefix_onlink). 1535 * If there's one, try to make the prefix on-link on the 1536 * interface. 1537 */ 1538 for (opr = nd_prefix.lh_first; opr; opr = opr->ndpr_next) { 1539 if (opr == pr) 1540 continue; 1541 1542 if ((opr->ndpr_stateflags & NDPRF_ONLINK) != 0) 1543 continue; 1544 1545 /* 1546 * KAME specific: detached prefixes should not be 1547 * on-link. 1548 */ 1549 if ((opr->ndpr_stateflags & NDPRF_DETACHED) != 0) 1550 continue; 1551 1552 if (opr->ndpr_plen == pr->ndpr_plen && 1553 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr, 1554 &opr->ndpr_prefix.sin6_addr, 1555 pr->ndpr_plen)) { 1556 int e; 1557 1558 if ((e = nd6_prefix_onlink(opr)) != 0) { 1559 nd6log((LOG_ERR, 1560 "nd6_prefix_offlink: failed to " 1561 "recover a prefix %s/%d from %s " 1562 "to %s (errno = %d)\n", 1563 ip6_sprintf(&opr->ndpr_prefix.sin6_addr), 1564 opr->ndpr_plen, if_name(ifp), 1565 if_name(opr->ndpr_ifp), e)); 1566 } 1567 } 1568 } 1569 } 1570 else { 1571 /* XXX: can we still set the NDPRF_ONLINK flag? */ 1572 nd6log((LOG_ERR, 1573 "nd6_prefix_offlink: failed to delete route: " 1574 "%s/%d on %s (errno = %d)\n", 1575 ip6_sprintf(&sa6.sin6_addr), pr->ndpr_plen, if_name(ifp), 1576 error)); 1577 } 1578 1579 if (rt != NULL) 1580 RTFREE(rt); 1581 1582 return(error); 1583 } 1584 1585 static struct in6_ifaddr * 1586 in6_ifadd(pr, ifid) 1587 struct nd_prefix *pr; 1588 struct in6_addr *ifid; /* Mobile IPv6 addition */ 1589 { 1590 struct ifnet *ifp = pr->ndpr_ifp; 1591 struct ifaddr *ifa; 1592 struct in6_aliasreq ifra; 1593 struct in6_ifaddr *ia, *ib; 1594 int error, plen0; 1595 struct in6_addr mask; 1596 int prefixlen = pr->ndpr_plen; 1597 1598 in6_len2mask(&mask, prefixlen); 1599 1600 /* 1601 * find a link-local address (will be interface ID). 1602 * Is it really mandatory? Theoretically, a global or a site-local 1603 * address can be configured without a link-local address, if we 1604 * have a unique interface identifier... 1605 * 1606 * it is not mandatory to have a link-local address, we can generate 1607 * interface identifier on the fly. we do this because: 1608 * (1) it should be the easiest way to find interface identifier. 1609 * (2) RFC2462 5.4 suggesting the use of the same interface identifier 1610 * for multiple addresses on a single interface, and possible shortcut 1611 * of DAD. we omitted DAD for this reason in the past. 1612 * (3) a user can prevent autoconfiguration of global address 1613 * by removing link-local address by hand (this is partly because we 1614 * don't have other way to control the use of IPv6 on an interface. 1615 * this has been our design choice - cf. NRL's "ifconfig auto"). 1616 * (4) it is easier to manage when an interface has addresses 1617 * with the same interface identifier, than to have multiple addresses 1618 * with different interface identifiers. 1619 * 1620 * Mobile IPv6 addition: allow for caller to specify a wished interface 1621 * ID. This is to not break connections when moving addresses between 1622 * interfaces. 1623 */ 1624 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0);/* 0 is OK? */ 1625 if (ifa) 1626 ib = (struct in6_ifaddr *)ifa; 1627 else 1628 return NULL; 1629 1630 #if 0 /* don't care link local addr state, and always do DAD */ 1631 /* if link-local address is not eligible, do not autoconfigure. */ 1632 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) { 1633 printf("in6_ifadd: link-local address not ready\n"); 1634 return NULL; 1635 } 1636 #endif 1637 1638 /* prefixlen + ifidlen must be equal to 128 */ 1639 plen0 = in6_mask2len(&ib->ia_prefixmask.sin6_addr, NULL); 1640 if (prefixlen != plen0) { 1641 nd6log((LOG_INFO, "in6_ifadd: wrong prefixlen for %s " 1642 "(prefix=%d ifid=%d)\n", 1643 if_name(ifp), prefixlen, 128 - plen0)); 1644 return NULL; 1645 } 1646 1647 /* make ifaddr */ 1648 1649 bzero(&ifra, sizeof(ifra)); 1650 /* 1651 * in6_update_ifa() does not use ifra_name, but we accurately set it 1652 * for safety. 1653 */ 1654 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 1655 ifra.ifra_addr.sin6_family = AF_INET6; 1656 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 1657 /* prefix */ 1658 bcopy(&pr->ndpr_prefix.sin6_addr, &ifra.ifra_addr.sin6_addr, 1659 sizeof(ifra.ifra_addr.sin6_addr)); 1660 ifra.ifra_addr.sin6_addr.s6_addr32[0] &= mask.s6_addr32[0]; 1661 ifra.ifra_addr.sin6_addr.s6_addr32[1] &= mask.s6_addr32[1]; 1662 ifra.ifra_addr.sin6_addr.s6_addr32[2] &= mask.s6_addr32[2]; 1663 ifra.ifra_addr.sin6_addr.s6_addr32[3] &= mask.s6_addr32[3]; 1664 1665 /* interface ID */ 1666 if (ifid == NULL || IN6_IS_ADDR_UNSPECIFIED(ifid)) 1667 ifid = &ib->ia_addr.sin6_addr; 1668 ifra.ifra_addr.sin6_addr.s6_addr32[0] 1669 |= (ifid->s6_addr32[0] & ~mask.s6_addr32[0]); 1670 ifra.ifra_addr.sin6_addr.s6_addr32[1] 1671 |= (ifid->s6_addr32[1] & ~mask.s6_addr32[1]); 1672 ifra.ifra_addr.sin6_addr.s6_addr32[2] 1673 |= (ifid->s6_addr32[2] & ~mask.s6_addr32[2]); 1674 ifra.ifra_addr.sin6_addr.s6_addr32[3] 1675 |= (ifid->s6_addr32[3] & ~mask.s6_addr32[3]); 1676 1677 /* new prefix mask. */ 1678 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 1679 ifra.ifra_prefixmask.sin6_family = AF_INET6; 1680 bcopy(&mask, &ifra.ifra_prefixmask.sin6_addr, 1681 sizeof(ifra.ifra_prefixmask.sin6_addr)); 1682 1683 /* 1684 * lifetime. 1685 * XXX: in6_init_address_ltimes would override these values later. 1686 * We should reconsider this logic. 1687 */ 1688 ifra.ifra_lifetime.ia6t_vltime = pr->ndpr_vltime; 1689 ifra.ifra_lifetime.ia6t_pltime = pr->ndpr_pltime; 1690 1691 /* XXX: scope zone ID? */ 1692 1693 ifra.ifra_flags |= IN6_IFF_AUTOCONF; /* obey autoconf */ 1694 /* 1695 * temporarily set the nopfx flag to avoid conflict. 1696 * XXX: we should reconsider the entire mechanism about prefix 1697 * manipulation. 1698 */ 1699 ifra.ifra_flags |= IN6_IFF_NOPFX; 1700 1701 /* 1702 * keep the new address, regardless of the result of in6_update_ifa. 1703 * XXX: this address is now meaningless. 1704 * We should reconsider its role. 1705 */ 1706 pr->ndpr_addr = ifra.ifra_addr.sin6_addr; 1707 1708 /* allocate ifaddr structure, link into chain, etc. */ 1709 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) { 1710 nd6log((LOG_ERR, 1711 "in6_ifadd: failed to make ifaddr %s on %s (errno=%d)\n", 1712 ip6_sprintf(&ifra.ifra_addr.sin6_addr), if_name(ifp), 1713 error)); 1714 return(NULL); /* ifaddr must not have been allocated. */ 1715 } 1716 1717 ia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr); 1718 1719 return(ia); /* this must NOT be NULL. */ 1720 } 1721 1722 int 1723 in6_tmpifadd(ia0, forcegen) 1724 const struct in6_ifaddr *ia0; /* corresponding public address */ 1725 int forcegen; 1726 { 1727 struct ifnet *ifp = ia0->ia_ifa.ifa_ifp; 1728 struct in6_ifaddr *newia; 1729 struct in6_aliasreq ifra; 1730 int i, error; 1731 int trylimit = 3; /* XXX: adhoc value */ 1732 u_int32_t randid[2]; 1733 time_t vltime0, pltime0; 1734 1735 bzero(&ifra, sizeof(ifra)); 1736 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 1737 ifra.ifra_addr = ia0->ia_addr; 1738 /* copy prefix mask */ 1739 ifra.ifra_prefixmask = ia0->ia_prefixmask; 1740 /* clear the old IFID */ 1741 for (i = 0; i < 4; i++) { 1742 ifra.ifra_addr.sin6_addr.s6_addr32[i] 1743 &= ifra.ifra_prefixmask.sin6_addr.s6_addr32[i]; 1744 } 1745 1746 again: 1747 in6_get_tmpifid(ifp, (u_int8_t *)randid, 1748 (const u_int8_t *)&ia0->ia_addr.sin6_addr.s6_addr[8], 1749 forcegen); 1750 ifra.ifra_addr.sin6_addr.s6_addr32[2] 1751 |= (randid[0] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[2])); 1752 ifra.ifra_addr.sin6_addr.s6_addr32[3] 1753 |= (randid[1] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[3])); 1754 1755 /* 1756 * If by chance the new temporary address is the same as an address 1757 * already assigned to the interface, generate a new randomized 1758 * interface identifier and repeat this step. 1759 * RFC 3041 3.3 (4). 1760 */ 1761 if (in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr) != NULL) { 1762 if (trylimit-- == 0) { 1763 nd6log((LOG_NOTICE, "in6_tmpifadd: failed to find " 1764 "a unique random IFID\n")); 1765 return(EEXIST); 1766 } 1767 forcegen = 1; 1768 goto again; 1769 } 1770 1771 /* 1772 * The Valid Lifetime is the lower of the Valid Lifetime of the 1773 * public address or TEMP_VALID_LIFETIME. 1774 * The Preferred Lifetime is the lower of the Preferred Lifetime 1775 * of the public address or TEMP_PREFERRED_LIFETIME - 1776 * DESYNC_FACTOR. 1777 */ 1778 if (ia0->ia6_lifetime.ia6t_expire != 0) { 1779 vltime0 = IFA6_IS_INVALID(ia0) ? 0 : 1780 (ia0->ia6_lifetime.ia6t_expire - time_second); 1781 if (vltime0 > ip6_temp_valid_lifetime) 1782 vltime0 = ip6_temp_valid_lifetime; 1783 } else 1784 vltime0 = ip6_temp_valid_lifetime; 1785 if (ia0->ia6_lifetime.ia6t_preferred != 0) { 1786 pltime0 = IFA6_IS_DEPRECATED(ia0) ? 0 : 1787 (ia0->ia6_lifetime.ia6t_preferred - time_second); 1788 if (pltime0 > ip6_temp_preferred_lifetime - ip6_desync_factor){ 1789 pltime0 = ip6_temp_preferred_lifetime - 1790 ip6_desync_factor; 1791 } 1792 } else 1793 pltime0 = ip6_temp_preferred_lifetime - ip6_desync_factor; 1794 ifra.ifra_lifetime.ia6t_vltime = vltime0; 1795 ifra.ifra_lifetime.ia6t_pltime = pltime0; 1796 1797 /* 1798 * A temporary address is created only if this calculated Preferred 1799 * Lifetime is greater than REGEN_ADVANCE time units. 1800 */ 1801 if (ifra.ifra_lifetime.ia6t_pltime <= ip6_temp_regen_advance) 1802 return(0); 1803 1804 /* XXX: scope zone ID? */ 1805 1806 ifra.ifra_flags |= (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY); 1807 1808 /* allocate ifaddr structure, link into chain, etc. */ 1809 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) 1810 return(error); 1811 1812 newia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr); 1813 if (newia == NULL) { /* XXX: can it happen? */ 1814 nd6log((LOG_ERR, 1815 "in6_tmpifadd: ifa update succeeded, but we got " 1816 "no ifaddr\n")); 1817 return(EINVAL); /* XXX */ 1818 } 1819 newia->ia6_ndpr = ia0->ia6_ndpr; 1820 newia->ia6_ndpr->ndpr_refcnt++; 1821 1822 /* 1823 * A newly added address might affect the status of other addresses. 1824 * XXX: when the temporary address is generated with a new public 1825 * address, the onlink check is redundant. However, it would be safe 1826 * to do the check explicitly everywhere a new address is generated, 1827 * and, in fact, we surely need the check when we create a new 1828 * temporary address due to deprecation of an old temporary address. 1829 */ 1830 pfxlist_onlink_check(); 1831 1832 return(0); 1833 } 1834 1835 int 1836 in6_init_prefix_ltimes(struct nd_prefix *ndpr) 1837 { 1838 /* check if preferred lifetime > valid lifetime. RFC2462 5.5.3 (c) */ 1839 if (ndpr->ndpr_pltime > ndpr->ndpr_vltime) { 1840 nd6log((LOG_INFO, "in6_init_prefix_ltimes: preferred lifetime" 1841 "(%d) is greater than valid lifetime(%d)\n", 1842 (u_int)ndpr->ndpr_pltime, (u_int)ndpr->ndpr_vltime)); 1843 return (EINVAL); 1844 } 1845 if (ndpr->ndpr_pltime == ND6_INFINITE_LIFETIME) 1846 ndpr->ndpr_preferred = 0; 1847 else 1848 ndpr->ndpr_preferred = time_second + ndpr->ndpr_pltime; 1849 if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME) 1850 ndpr->ndpr_expire = 0; 1851 else 1852 ndpr->ndpr_expire = time_second + ndpr->ndpr_vltime; 1853 1854 return 0; 1855 } 1856 1857 static void 1858 in6_init_address_ltimes(struct nd_prefix *new, struct in6_addrlifetime *lt6) 1859 { 1860 /* Valid lifetime must not be updated unless explicitly specified. */ 1861 /* init ia6t_expire */ 1862 if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME) 1863 lt6->ia6t_expire = 0; 1864 else { 1865 lt6->ia6t_expire = time_second; 1866 lt6->ia6t_expire += lt6->ia6t_vltime; 1867 } 1868 1869 /* init ia6t_preferred */ 1870 if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME) 1871 lt6->ia6t_preferred = 0; 1872 else { 1873 lt6->ia6t_preferred = time_second; 1874 lt6->ia6t_preferred += lt6->ia6t_pltime; 1875 } 1876 } 1877 1878 /* 1879 * Delete all the routing table entries that use the specified gateway. 1880 * XXX: this function causes search through all entries of routing table, so 1881 * it shouldn't be called when acting as a router. 1882 */ 1883 void 1884 rt6_flush(gateway, ifp) 1885 struct in6_addr *gateway; 1886 struct ifnet *ifp; 1887 { 1888 struct radix_node_head *rnh = rt_tables[AF_INET6]; 1889 int s = splnet(); 1890 1891 /* We'll care only link-local addresses */ 1892 if (!IN6_IS_ADDR_LINKLOCAL(gateway)) { 1893 splx(s); 1894 return; 1895 } 1896 /* XXX: hack for KAME's link-local address kludge */ 1897 gateway->s6_addr16[1] = htons(ifp->if_index); 1898 1899 RADIX_NODE_HEAD_LOCK(rnh); 1900 rnh->rnh_walktree(rnh, rt6_deleteroute, (void *)gateway); 1901 RADIX_NODE_HEAD_UNLOCK(rnh); 1902 splx(s); 1903 } 1904 1905 static int 1906 rt6_deleteroute(rn, arg) 1907 struct radix_node *rn; 1908 void *arg; 1909 { 1910 #define SIN6(s) ((struct sockaddr_in6 *)s) 1911 struct rtentry *rt = (struct rtentry *)rn; 1912 struct in6_addr *gate = (struct in6_addr *)arg; 1913 1914 if (rt->rt_gateway == NULL || rt->rt_gateway->sa_family != AF_INET6) 1915 return(0); 1916 1917 if (!IN6_ARE_ADDR_EQUAL(gate, &SIN6(rt->rt_gateway)->sin6_addr)) 1918 return(0); 1919 1920 /* 1921 * Do not delete a static route. 1922 * XXX: this seems to be a bit ad-hoc. Should we consider the 1923 * 'cloned' bit instead? 1924 */ 1925 if ((rt->rt_flags & RTF_STATIC) != 0) 1926 return(0); 1927 1928 /* 1929 * We delete only host route. This means, in particular, we don't 1930 * delete default route. 1931 */ 1932 if ((rt->rt_flags & RTF_HOST) == 0) 1933 return(0); 1934 1935 return(rtrequest(RTM_DELETE, rt_key(rt), 1936 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0)); 1937 #undef SIN6 1938 } 1939 1940 int 1941 nd6_setdefaultiface(ifindex) 1942 int ifindex; 1943 { 1944 int error = 0; 1945 1946 if (ifindex < 0 || if_index < ifindex) 1947 return(EINVAL); 1948 1949 if (nd6_defifindex != ifindex) { 1950 nd6_defifindex = ifindex; 1951 if (nd6_defifindex > 0) 1952 nd6_defifp = ifnet_byindex(nd6_defifindex); 1953 else 1954 nd6_defifp = NULL; 1955 1956 /* 1957 * If the Default Router List is empty, install a route 1958 * to the specified interface as default or remove the default 1959 * route when the default interface becomes canceled. 1960 * The check for the queue is actually redundant, but 1961 * we do this here to avoid re-install the default route 1962 * if the list is NOT empty. 1963 */ 1964 if (TAILQ_FIRST(&nd_defrouter) == NULL) 1965 defrouter_select(); 1966 1967 /* 1968 * Our current implementation assumes one-to-one maping between 1969 * interfaces and links, so it would be natural to use the 1970 * default interface as the default link. 1971 */ 1972 scope6_setdefault(nd6_defifp); 1973 } 1974 1975 return(error); 1976 } 1977