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 1.7 2004/12/30 02:26:12 hsu 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 /* 222 * We only accept RAs only when 223 * the system-wide variable allows the acceptance, and 224 * per-interface variable allows RAs on the receiving interface. 225 */ 226 if (ip6_accept_rtadv == 0) 227 goto freeit; 228 if (!(ndi->flags & ND6_IFF_ACCEPT_RTADV)) 229 goto freeit; 230 231 if (ip6->ip6_hlim != 255) { 232 nd6log((LOG_ERR, 233 "nd6_ra_input: invalid hlim (%d) from %s to %s on %s\n", 234 ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src), 235 ip6_sprintf(&ip6->ip6_dst), if_name(ifp))); 236 goto bad; 237 } 238 239 if (!IN6_IS_ADDR_LINKLOCAL(&saddr6)) { 240 nd6log((LOG_ERR, 241 "nd6_ra_input: src %s is not link-local\n", 242 ip6_sprintf(&saddr6))); 243 goto bad; 244 } 245 246 #ifndef PULLDOWN_TEST 247 IP6_EXTHDR_CHECK(m, off, icmp6len,); 248 nd_ra = (struct nd_router_advert *)((caddr_t)ip6 + off); 249 #else 250 IP6_EXTHDR_GET(nd_ra, struct nd_router_advert *, m, off, icmp6len); 251 if (nd_ra == NULL) { 252 icmp6stat.icp6s_tooshort++; 253 return; 254 } 255 #endif 256 257 icmp6len -= sizeof(*nd_ra); 258 nd6_option_init(nd_ra + 1, icmp6len, &ndopts); 259 if (nd6_options(&ndopts) < 0) { 260 nd6log((LOG_INFO, 261 "nd6_ra_input: invalid ND option, ignored\n")); 262 /* nd6_options have incremented stats */ 263 goto freeit; 264 } 265 266 { 267 struct nd_defrouter dr0; 268 u_int32_t advreachable = nd_ra->nd_ra_reachable; 269 270 dr0.rtaddr = saddr6; 271 dr0.flags = nd_ra->nd_ra_flags_reserved; 272 dr0.rtlifetime = ntohs(nd_ra->nd_ra_router_lifetime); 273 dr0.expire = time_second + dr0.rtlifetime; 274 dr0.ifp = ifp; 275 dr0.advint = 0; /* Mobile IPv6 */ 276 dr0.advint_expire = 0; /* Mobile IPv6 */ 277 dr0.advints_lost = 0; /* Mobile IPv6 */ 278 /* unspecified or not? (RFC 2461 6.3.4) */ 279 if (advreachable) { 280 advreachable = ntohl(advreachable); 281 if (advreachable <= MAX_REACHABLE_TIME && 282 ndi->basereachable != advreachable) { 283 ndi->basereachable = advreachable; 284 ndi->reachable = ND_COMPUTE_RTIME(ndi->basereachable); 285 ndi->recalctm = nd6_recalc_reachtm_interval; /* reset */ 286 } 287 } 288 if (nd_ra->nd_ra_retransmit) 289 ndi->retrans = ntohl(nd_ra->nd_ra_retransmit); 290 if (nd_ra->nd_ra_curhoplimit) 291 ndi->chlim = nd_ra->nd_ra_curhoplimit; 292 dr = defrtrlist_update(&dr0); 293 } 294 295 /* 296 * prefix 297 */ 298 if (ndopts.nd_opts_pi) { 299 struct nd_opt_hdr *pt; 300 struct nd_opt_prefix_info *pi = NULL; 301 struct nd_prefix pr; 302 303 for (pt = (struct nd_opt_hdr *)ndopts.nd_opts_pi; 304 pt <= (struct nd_opt_hdr *)ndopts.nd_opts_pi_end; 305 pt = (struct nd_opt_hdr *)((caddr_t)pt + 306 (pt->nd_opt_len << 3))) { 307 if (pt->nd_opt_type != ND_OPT_PREFIX_INFORMATION) 308 continue; 309 pi = (struct nd_opt_prefix_info *)pt; 310 311 if (pi->nd_opt_pi_len != 4) { 312 nd6log((LOG_INFO, 313 "nd6_ra_input: invalid option " 314 "len %d for prefix information option, " 315 "ignored\n", pi->nd_opt_pi_len)); 316 continue; 317 } 318 319 if (128 < pi->nd_opt_pi_prefix_len) { 320 nd6log((LOG_INFO, 321 "nd6_ra_input: invalid prefix " 322 "len %d for prefix information option, " 323 "ignored\n", pi->nd_opt_pi_prefix_len)); 324 continue; 325 } 326 327 if (IN6_IS_ADDR_MULTICAST(&pi->nd_opt_pi_prefix) 328 || IN6_IS_ADDR_LINKLOCAL(&pi->nd_opt_pi_prefix)) { 329 nd6log((LOG_INFO, 330 "nd6_ra_input: invalid prefix " 331 "%s, ignored\n", 332 ip6_sprintf(&pi->nd_opt_pi_prefix))); 333 continue; 334 } 335 336 /* aggregatable unicast address, rfc2374 */ 337 if ((pi->nd_opt_pi_prefix.s6_addr8[0] & 0xe0) == 0x20 338 && pi->nd_opt_pi_prefix_len != 64) { 339 nd6log((LOG_INFO, 340 "nd6_ra_input: invalid prefixlen " 341 "%d for rfc2374 prefix %s, ignored\n", 342 pi->nd_opt_pi_prefix_len, 343 ip6_sprintf(&pi->nd_opt_pi_prefix))); 344 continue; 345 } 346 347 bzero(&pr, sizeof(pr)); 348 pr.ndpr_prefix.sin6_family = AF_INET6; 349 pr.ndpr_prefix.sin6_len = sizeof(pr.ndpr_prefix); 350 pr.ndpr_prefix.sin6_addr = pi->nd_opt_pi_prefix; 351 pr.ndpr_ifp = (struct ifnet *)m->m_pkthdr.rcvif; 352 353 pr.ndpr_raf_onlink = (pi->nd_opt_pi_flags_reserved & 354 ND_OPT_PI_FLAG_ONLINK) ? 1 : 0; 355 pr.ndpr_raf_auto = (pi->nd_opt_pi_flags_reserved & 356 ND_OPT_PI_FLAG_AUTO) ? 1 : 0; 357 pr.ndpr_plen = pi->nd_opt_pi_prefix_len; 358 pr.ndpr_vltime = ntohl(pi->nd_opt_pi_valid_time); 359 pr.ndpr_pltime = 360 ntohl(pi->nd_opt_pi_preferred_time); 361 362 if (in6_init_prefix_ltimes(&pr)) 363 continue; /* prefix lifetime init failed */ 364 365 (void)prelist_update(&pr, dr, m); 366 } 367 } 368 369 /* 370 * MTU 371 */ 372 if (ndopts.nd_opts_mtu && ndopts.nd_opts_mtu->nd_opt_mtu_len == 1) { 373 u_int32_t mtu = ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu); 374 375 /* lower bound */ 376 if (mtu < IPV6_MMTU) { 377 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu option " 378 "mtu=%d sent from %s, ignoring\n", 379 mtu, ip6_sprintf(&ip6->ip6_src))); 380 goto skip; 381 } 382 383 /* upper bound */ 384 if (ndi->maxmtu) { 385 if (mtu <= ndi->maxmtu) { 386 int change = (ndi->linkmtu != mtu); 387 388 ndi->linkmtu = mtu; 389 if (change) /* in6_maxmtu may change */ 390 in6_setmaxmtu(); 391 } else { 392 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu " 393 "mtu=%d sent from %s; " 394 "exceeds maxmtu %d, ignoring\n", 395 mtu, ip6_sprintf(&ip6->ip6_src), 396 ndi->maxmtu)); 397 } 398 } else { 399 nd6log((LOG_INFO, "nd6_ra_input: mtu option " 400 "mtu=%d sent from %s; maxmtu unknown, " 401 "ignoring\n", 402 mtu, ip6_sprintf(&ip6->ip6_src))); 403 } 404 } 405 406 skip: 407 408 /* 409 * Source link layer address 410 */ 411 { 412 char *lladdr = NULL; 413 int lladdrlen = 0; 414 415 if (ndopts.nd_opts_src_lladdr) { 416 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1); 417 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3; 418 } 419 420 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 421 nd6log((LOG_INFO, 422 "nd6_ra_input: lladdrlen mismatch for %s " 423 "(if %d, RA packet %d)\n", 424 ip6_sprintf(&saddr6), ifp->if_addrlen, lladdrlen - 2)); 425 goto bad; 426 } 427 428 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_ADVERT, 0); 429 430 /* 431 * Installing a link-layer address might change the state of the 432 * router's neighbor cache, which might also affect our on-link 433 * detection of adveritsed prefixes. 434 */ 435 pfxlist_onlink_check(); 436 } 437 438 freeit: 439 m_freem(m); 440 return; 441 442 bad: 443 icmp6stat.icp6s_badra++; 444 m_freem(m); 445 } 446 447 /* 448 * default router list proccessing sub routines 449 */ 450 451 /* tell the change to user processes watching the routing socket. */ 452 static void 453 nd6_rtmsg(cmd, rt) 454 int cmd; 455 struct rtentry *rt; 456 { 457 struct rt_addrinfo info; 458 459 bzero((caddr_t)&info, sizeof(info)); 460 info.rti_info[RTAX_DST] = rt_key(rt); 461 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 462 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 463 info.rti_info[RTAX_IFP] = 464 (struct sockaddr *)TAILQ_FIRST(&rt->rt_ifp->if_addrlist); 465 info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr; 466 467 rt_missmsg(cmd, &info, rt->rt_flags, 0); 468 } 469 470 void 471 defrouter_addreq(new) 472 struct nd_defrouter *new; 473 { 474 struct sockaddr_in6 def, mask, gate; 475 struct rtentry *newrt = NULL; 476 int s; 477 478 bzero(&def, sizeof(def)); 479 bzero(&mask, sizeof(mask)); 480 bzero(&gate, sizeof(gate)); 481 482 def.sin6_len = mask.sin6_len = gate.sin6_len 483 = sizeof(struct sockaddr_in6); 484 def.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6; 485 gate.sin6_addr = new->rtaddr; 486 487 s = splnet(); 488 (void)rtrequest(RTM_ADD, (struct sockaddr *)&def, 489 (struct sockaddr *)&gate, (struct sockaddr *)&mask, 490 RTF_GATEWAY, &newrt); 491 if (newrt) { 492 nd6_rtmsg(RTM_ADD, newrt); /* tell user process */ 493 newrt->rt_refcnt--; 494 } 495 splx(s); 496 return; 497 } 498 499 /* Add a route to a given interface as default */ 500 void 501 defrouter_addifreq(ifp) 502 struct ifnet *ifp; 503 { 504 struct sockaddr_in6 def, mask; 505 struct ifaddr *ifa; 506 struct rtentry *newrt = NULL; 507 int error, flags; 508 509 bzero(&def, sizeof(def)); 510 bzero(&mask, sizeof(mask)); 511 512 def.sin6_len = mask.sin6_len = sizeof(struct sockaddr_in6); 513 def.sin6_family = mask.sin6_family = AF_INET6; 514 515 /* 516 * Search for an ifaddr beloging to the specified interface. 517 * XXX: An IPv6 address are required to be assigned on the interface. 518 */ 519 if ((ifa = ifaof_ifpforaddr((struct sockaddr *)&def, ifp)) == NULL) { 520 nd6log((LOG_ERR, /* better error? */ 521 "defrouter_addifreq: failed to find an ifaddr " 522 "to install a route to interface %s\n", 523 if_name(ifp))); 524 return; 525 } 526 527 flags = ifa->ifa_flags; 528 error = rtrequest(RTM_ADD, (struct sockaddr *)&def, ifa->ifa_addr, 529 (struct sockaddr *)&mask, flags, &newrt); 530 if (error != 0) { 531 nd6log((LOG_ERR, 532 "defrouter_addifreq: failed to install a route to " 533 "interface %s (errno = %d)\n", 534 if_name(ifp), error)); 535 536 if (newrt) /* maybe unnecessary, but do it for safety */ 537 newrt->rt_refcnt--; 538 } else { 539 if (newrt) { 540 nd6_rtmsg(RTM_ADD, newrt); 541 newrt->rt_refcnt--; 542 } 543 } 544 } 545 546 struct nd_defrouter * 547 defrouter_lookup(addr, ifp) 548 struct in6_addr *addr; 549 struct ifnet *ifp; 550 { 551 struct nd_defrouter *dr; 552 553 for (dr = TAILQ_FIRST(&nd_defrouter); dr; 554 dr = TAILQ_NEXT(dr, dr_entry)) { 555 if (dr->ifp == ifp && IN6_ARE_ADDR_EQUAL(addr, &dr->rtaddr)) 556 return(dr); 557 } 558 559 return(NULL); /* search failed */ 560 } 561 562 void 563 defrouter_delreq(dr, dofree) 564 struct nd_defrouter *dr; 565 int dofree; 566 { 567 struct sockaddr_in6 def, mask, gate; 568 struct rtentry *oldrt = NULL; 569 570 bzero(&def, sizeof(def)); 571 bzero(&mask, sizeof(mask)); 572 bzero(&gate, sizeof(gate)); 573 574 def.sin6_len = mask.sin6_len = gate.sin6_len 575 = sizeof(struct sockaddr_in6); 576 def.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6; 577 gate.sin6_addr = dr->rtaddr; 578 579 rtrequest(RTM_DELETE, (struct sockaddr *)&def, 580 (struct sockaddr *)&gate, 581 (struct sockaddr *)&mask, 582 RTF_GATEWAY, &oldrt); 583 if (oldrt) { 584 nd6_rtmsg(RTM_DELETE, oldrt); 585 if (oldrt->rt_refcnt <= 0) { 586 /* 587 * XXX: borrowed from the RTM_DELETE case of 588 * rtrequest(). 589 */ 590 oldrt->rt_refcnt++; 591 rtfree(oldrt); 592 } 593 } 594 595 if (dofree) /* XXX: necessary? */ 596 free(dr, M_IP6NDP); 597 } 598 599 void 600 defrtrlist_del(dr) 601 struct nd_defrouter *dr; 602 { 603 struct nd_defrouter *deldr = NULL; 604 struct nd_prefix *pr; 605 606 /* 607 * Flush all the routing table entries that use the router 608 * as a next hop. 609 */ 610 if (!ip6_forwarding && ip6_accept_rtadv) { 611 /* above is a good condition? */ 612 rt6_flush(&dr->rtaddr, dr->ifp); 613 } 614 615 if (dr == TAILQ_FIRST(&nd_defrouter)) 616 deldr = dr; /* The router is primary. */ 617 618 TAILQ_REMOVE(&nd_defrouter, dr, dr_entry); 619 620 /* 621 * Also delete all the pointers to the router in each prefix lists. 622 */ 623 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 624 struct nd_pfxrouter *pfxrtr; 625 if ((pfxrtr = pfxrtr_lookup(pr, dr)) != NULL) 626 pfxrtr_del(pfxrtr); 627 } 628 pfxlist_onlink_check(); 629 630 /* 631 * If the router is the primary one, choose a new one. 632 * Note that defrouter_select() will remove the current gateway 633 * from the routing table. 634 */ 635 if (deldr) 636 defrouter_select(); 637 638 free(dr, M_IP6NDP); 639 } 640 641 /* 642 * Default Router Selection according to Section 6.3.6 of RFC 2461: 643 * 1) Routers that are reachable or probably reachable should be 644 * preferred. 645 * 2) When no routers on the list are known to be reachable or 646 * probably reachable, routers SHOULD be selected in a round-robin 647 * fashion. 648 * 3) If the Default Router List is empty, assume that all 649 * destinations are on-link. 650 */ 651 void 652 defrouter_select() 653 { 654 int s = splnet(); 655 struct nd_defrouter *dr, anydr; 656 struct rtentry *rt = NULL; 657 struct llinfo_nd6 *ln = NULL; 658 659 /* 660 * Search for a (probably) reachable router from the list. 661 */ 662 for (dr = TAILQ_FIRST(&nd_defrouter); dr; 663 dr = TAILQ_NEXT(dr, dr_entry)) { 664 if ((rt = nd6_lookup(&dr->rtaddr, 0, dr->ifp)) && 665 (ln = (struct llinfo_nd6 *)rt->rt_llinfo) && 666 ND6_IS_LLINFO_PROBREACH(ln)) { 667 /* Got it, and move it to the head */ 668 TAILQ_REMOVE(&nd_defrouter, dr, dr_entry); 669 TAILQ_INSERT_HEAD(&nd_defrouter, dr, dr_entry); 670 break; 671 } 672 } 673 674 if ((dr = TAILQ_FIRST(&nd_defrouter))) { 675 /* 676 * De-install the previous default gateway and install 677 * a new one. 678 * Note that if there is no reachable router in the list, 679 * the head entry will be used anyway. 680 * XXX: do we have to check the current routing table entry? 681 */ 682 bzero(&anydr, sizeof(anydr)); 683 defrouter_delreq(&anydr, 0); 684 defrouter_addreq(dr); 685 } 686 else { 687 /* 688 * The Default Router List is empty, so install the default 689 * route to an inteface. 690 * XXX: The specification does not say this mechanism should 691 * be restricted to hosts, but this would be not useful 692 * (even harmful) for routers. 693 */ 694 if (!ip6_forwarding) { 695 /* 696 * De-install the current default route 697 * in advance. 698 */ 699 bzero(&anydr, sizeof(anydr)); 700 defrouter_delreq(&anydr, 0); 701 if (nd6_defifp) { 702 /* 703 * Install a route to the default interface 704 * as default route. 705 * XXX: we enable this for host only, because 706 * this may override a default route installed 707 * a user process (e.g. routing daemon) in a 708 * router case. 709 */ 710 defrouter_addifreq(nd6_defifp); 711 } else { 712 nd6log((LOG_INFO, "defrouter_select: " 713 "there's no default router and no default" 714 " interface\n")); 715 } 716 } 717 } 718 719 splx(s); 720 return; 721 } 722 723 static struct nd_defrouter * 724 defrtrlist_update(new) 725 struct nd_defrouter *new; 726 { 727 struct nd_defrouter *dr, *n; 728 int s = splnet(); 729 730 if ((dr = defrouter_lookup(&new->rtaddr, new->ifp)) != NULL) { 731 /* entry exists */ 732 if (new->rtlifetime == 0) { 733 defrtrlist_del(dr); 734 dr = NULL; 735 } else { 736 /* override */ 737 dr->flags = new->flags; /* xxx flag check */ 738 dr->rtlifetime = new->rtlifetime; 739 dr->expire = new->expire; 740 } 741 splx(s); 742 return(dr); 743 } 744 745 /* entry does not exist */ 746 if (new->rtlifetime == 0) { 747 splx(s); 748 return(NULL); 749 } 750 751 n = (struct nd_defrouter *)malloc(sizeof(*n), M_IP6NDP, M_NOWAIT); 752 if (n == NULL) { 753 splx(s); 754 return(NULL); 755 } 756 bzero(n, sizeof(*n)); 757 *n = *new; 758 759 /* 760 * Insert the new router at the end of the Default Router List. 761 * If there is no other router, install it anyway. Otherwise, 762 * just continue to use the current default router. 763 */ 764 TAILQ_INSERT_TAIL(&nd_defrouter, n, dr_entry); 765 if (TAILQ_FIRST(&nd_defrouter) == n) 766 defrouter_select(); 767 splx(s); 768 769 return(n); 770 } 771 772 static struct nd_pfxrouter * 773 pfxrtr_lookup(pr, dr) 774 struct nd_prefix *pr; 775 struct nd_defrouter *dr; 776 { 777 struct nd_pfxrouter *search; 778 779 for (search = pr->ndpr_advrtrs.lh_first; search; search = search->pfr_next) { 780 if (search->router == dr) 781 break; 782 } 783 784 return(search); 785 } 786 787 static void 788 pfxrtr_add(pr, dr) 789 struct nd_prefix *pr; 790 struct nd_defrouter *dr; 791 { 792 struct nd_pfxrouter *new; 793 794 new = (struct nd_pfxrouter *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT); 795 if (new == NULL) 796 return; 797 bzero(new, sizeof(*new)); 798 new->router = dr; 799 800 LIST_INSERT_HEAD(&pr->ndpr_advrtrs, new, pfr_entry); 801 802 pfxlist_onlink_check(); 803 } 804 805 static void 806 pfxrtr_del(pfr) 807 struct nd_pfxrouter *pfr; 808 { 809 LIST_REMOVE(pfr, pfr_entry); 810 free(pfr, M_IP6NDP); 811 } 812 813 struct nd_prefix * 814 nd6_prefix_lookup(pr) 815 struct nd_prefix *pr; 816 { 817 struct nd_prefix *search; 818 819 for (search = nd_prefix.lh_first; search; search = search->ndpr_next) { 820 if (pr->ndpr_ifp == search->ndpr_ifp && 821 pr->ndpr_plen == search->ndpr_plen && 822 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr, 823 &search->ndpr_prefix.sin6_addr, 824 pr->ndpr_plen) 825 ) { 826 break; 827 } 828 } 829 830 return(search); 831 } 832 833 int 834 nd6_prelist_add(pr, dr, newp) 835 struct nd_prefix *pr, **newp; 836 struct nd_defrouter *dr; 837 { 838 struct nd_prefix *new = NULL; 839 int i, s; 840 841 new = (struct nd_prefix *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT); 842 if (new == NULL) 843 return ENOMEM; 844 bzero(new, sizeof(*new)); 845 *new = *pr; 846 if (newp != NULL) 847 *newp = new; 848 849 /* initilization */ 850 LIST_INIT(&new->ndpr_advrtrs); 851 in6_prefixlen2mask(&new->ndpr_mask, new->ndpr_plen); 852 /* make prefix in the canonical form */ 853 for (i = 0; i < 4; i++) 854 new->ndpr_prefix.sin6_addr.s6_addr32[i] &= 855 new->ndpr_mask.s6_addr32[i]; 856 857 s = splnet(); 858 /* link ndpr_entry to nd_prefix list */ 859 LIST_INSERT_HEAD(&nd_prefix, new, ndpr_entry); 860 splx(s); 861 862 /* ND_OPT_PI_FLAG_ONLINK processing */ 863 if (new->ndpr_raf_onlink) { 864 int e; 865 866 if ((e = nd6_prefix_onlink(new)) != 0) { 867 nd6log((LOG_ERR, "nd6_prelist_add: failed to make " 868 "the prefix %s/%d on-link on %s (errno=%d)\n", 869 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 870 pr->ndpr_plen, if_name(pr->ndpr_ifp), e)); 871 /* proceed anyway. XXX: is it correct? */ 872 } 873 } 874 875 if (dr) { 876 pfxrtr_add(new, dr); 877 } 878 879 return 0; 880 } 881 882 void 883 prelist_remove(pr) 884 struct nd_prefix *pr; 885 { 886 struct nd_pfxrouter *pfr, *next; 887 int e, s; 888 889 /* make sure to invalidate the prefix until it is really freed. */ 890 pr->ndpr_vltime = 0; 891 pr->ndpr_pltime = 0; 892 #if 0 893 /* 894 * Though these flags are now meaningless, we'd rather keep the value 895 * not to confuse users when executing "ndp -p". 896 */ 897 pr->ndpr_raf_onlink = 0; 898 pr->ndpr_raf_auto = 0; 899 #endif 900 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0 && 901 (e = nd6_prefix_offlink(pr)) != 0) { 902 nd6log((LOG_ERR, "prelist_remove: failed to make %s/%d offlink " 903 "on %s, errno=%d\n", 904 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 905 pr->ndpr_plen, if_name(pr->ndpr_ifp), e)); 906 /* what should we do? */ 907 } 908 909 if (pr->ndpr_refcnt > 0) 910 return; /* notice here? */ 911 912 s = splnet(); 913 914 /* unlink ndpr_entry from nd_prefix list */ 915 LIST_REMOVE(pr, ndpr_entry); 916 917 /* free list of routers that adversed the prefix */ 918 for (pfr = pr->ndpr_advrtrs.lh_first; pfr; pfr = next) { 919 next = pfr->pfr_next; 920 921 free(pfr, M_IP6NDP); 922 } 923 splx(s); 924 925 free(pr, M_IP6NDP); 926 927 pfxlist_onlink_check(); 928 } 929 930 int 931 prelist_update(new, dr, m) 932 struct nd_prefix *new; 933 struct nd_defrouter *dr; /* may be NULL */ 934 struct mbuf *m; 935 { 936 struct in6_ifaddr *ia6 = NULL, *ia6_match = NULL; 937 struct ifaddr *ifa; 938 struct ifnet *ifp = new->ndpr_ifp; 939 struct nd_prefix *pr; 940 int s = splnet(); 941 int error = 0; 942 int newprefix = 0; 943 int auth; 944 struct in6_addrlifetime lt6_tmp; 945 946 auth = 0; 947 if (m) { 948 /* 949 * Authenticity for NA consists authentication for 950 * both IP header and IP datagrams, doesn't it ? 951 */ 952 #if defined(M_AUTHIPHDR) && defined(M_AUTHIPDGM) 953 auth = (m->m_flags & M_AUTHIPHDR 954 && m->m_flags & M_AUTHIPDGM) ? 1 : 0; 955 #endif 956 } 957 958 959 if ((pr = nd6_prefix_lookup(new)) != NULL) { 960 /* 961 * nd6_prefix_lookup() ensures that pr and new have the same 962 * prefix on a same interface. 963 */ 964 965 /* 966 * Update prefix information. Note that the on-link (L) bit 967 * and the autonomous (A) bit should NOT be changed from 1 968 * to 0. 969 */ 970 if (new->ndpr_raf_onlink == 1) 971 pr->ndpr_raf_onlink = 1; 972 if (new->ndpr_raf_auto == 1) 973 pr->ndpr_raf_auto = 1; 974 if (new->ndpr_raf_onlink) { 975 pr->ndpr_vltime = new->ndpr_vltime; 976 pr->ndpr_pltime = new->ndpr_pltime; 977 pr->ndpr_preferred = new->ndpr_preferred; 978 pr->ndpr_expire = new->ndpr_expire; 979 } 980 981 if (new->ndpr_raf_onlink && 982 (pr->ndpr_stateflags & NDPRF_ONLINK) == 0) { 983 int e; 984 985 if ((e = nd6_prefix_onlink(pr)) != 0) { 986 nd6log((LOG_ERR, 987 "prelist_update: failed to make " 988 "the prefix %s/%d on-link on %s " 989 "(errno=%d)\n", 990 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 991 pr->ndpr_plen, if_name(pr->ndpr_ifp), e)); 992 /* proceed anyway. XXX: is it correct? */ 993 } 994 } 995 996 if (dr && pfxrtr_lookup(pr, dr) == NULL) 997 pfxrtr_add(pr, dr); 998 } else { 999 struct nd_prefix *newpr = NULL; 1000 1001 newprefix = 1; 1002 1003 if (new->ndpr_vltime == 0) 1004 goto end; 1005 if (new->ndpr_raf_onlink == 0 && new->ndpr_raf_auto == 0) 1006 goto end; 1007 1008 bzero(&new->ndpr_addr, sizeof(struct in6_addr)); 1009 1010 error = nd6_prelist_add(new, dr, &newpr); 1011 if (error != 0 || newpr == NULL) { 1012 nd6log((LOG_NOTICE, "prelist_update: " 1013 "nd6_prelist_add failed for %s/%d on %s " 1014 "errno=%d, returnpr=%p\n", 1015 ip6_sprintf(&new->ndpr_prefix.sin6_addr), 1016 new->ndpr_plen, if_name(new->ndpr_ifp), 1017 error, newpr)); 1018 goto end; /* we should just give up in this case. */ 1019 } 1020 1021 /* 1022 * XXX: from the ND point of view, we can ignore a prefix 1023 * with the on-link bit being zero. However, we need a 1024 * prefix structure for references from autoconfigured 1025 * addresses. Thus, we explicitly make suret that the prefix 1026 * itself expires now. 1027 */ 1028 if (newpr->ndpr_raf_onlink == 0) { 1029 newpr->ndpr_vltime = 0; 1030 newpr->ndpr_pltime = 0; 1031 in6_init_prefix_ltimes(newpr); 1032 } 1033 1034 pr = newpr; 1035 } 1036 1037 /* 1038 * Address autoconfiguration based on Section 5.5.3 of RFC 2462. 1039 * Note that pr must be non NULL at this point. 1040 */ 1041 1042 /* 5.5.3 (a). Ignore the prefix without the A bit set. */ 1043 if (!new->ndpr_raf_auto) 1044 goto afteraddrconf; 1045 1046 /* 1047 * 5.5.3 (b). the link-local prefix should have been ignored in 1048 * nd6_ra_input. 1049 */ 1050 1051 /* 1052 * 5.5.3 (c). Consistency check on lifetimes: pltime <= vltime. 1053 * This should have been done in nd6_ra_input. 1054 */ 1055 1056 /* 1057 * 5.5.3 (d). If the prefix advertised does not match the prefix of an 1058 * address already in the list, and the Valid Lifetime is not 0, 1059 * form an address. Note that even a manually configured address 1060 * should reject autoconfiguration of a new address. 1061 */ 1062 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 1063 { 1064 struct in6_ifaddr *ifa6; 1065 int ifa_plen; 1066 u_int32_t storedlifetime; 1067 1068 if (ifa->ifa_addr->sa_family != AF_INET6) 1069 continue; 1070 1071 ifa6 = (struct in6_ifaddr *)ifa; 1072 1073 /* 1074 * Spec is not clear here, but I believe we should concentrate 1075 * on unicast (i.e. not anycast) addresses. 1076 * XXX: other ia6_flags? detached or duplicated? 1077 */ 1078 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0) 1079 continue; 1080 1081 ifa_plen = in6_mask2len(&ifa6->ia_prefixmask.sin6_addr, NULL); 1082 if (ifa_plen != new->ndpr_plen || 1083 !in6_are_prefix_equal(&ifa6->ia_addr.sin6_addr, 1084 &new->ndpr_prefix.sin6_addr, 1085 ifa_plen)) 1086 continue; 1087 1088 if (ia6_match == NULL) /* remember the first one */ 1089 ia6_match = ifa6; 1090 1091 if ((ifa6->ia6_flags & IN6_IFF_AUTOCONF) == 0) 1092 continue; 1093 1094 /* 1095 * An already autoconfigured address matched. Now that we 1096 * are sure there is at least one matched address, we can 1097 * proceed to 5.5.3. (e): update the lifetimes according to the 1098 * "two hours" rule and the privacy extension. 1099 */ 1100 #define TWOHOUR (120*60) 1101 lt6_tmp = ifa6->ia6_lifetime; 1102 1103 if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME) 1104 storedlifetime = ND6_INFINITE_LIFETIME; 1105 else if (IFA6_IS_INVALID(ifa6)) 1106 storedlifetime = 0; 1107 else 1108 storedlifetime = lt6_tmp.ia6t_expire - time_second; 1109 1110 /* when not updating, keep the current stored lifetime. */ 1111 lt6_tmp.ia6t_vltime = storedlifetime; 1112 1113 if (TWOHOUR < new->ndpr_vltime || 1114 storedlifetime < new->ndpr_vltime) { 1115 lt6_tmp.ia6t_vltime = new->ndpr_vltime; 1116 } else if (storedlifetime <= TWOHOUR 1117 #if 0 1118 /* 1119 * This condition is logically redundant, so we just 1120 * omit it. 1121 * See IPng 6712, 6717, and 6721. 1122 */ 1123 && new->ndpr_vltime <= storedlifetime 1124 #endif 1125 ) { 1126 if (auth) { 1127 lt6_tmp.ia6t_vltime = new->ndpr_vltime; 1128 } 1129 } else { 1130 /* 1131 * new->ndpr_vltime <= TWOHOUR && 1132 * TWOHOUR < storedlifetime 1133 */ 1134 lt6_tmp.ia6t_vltime = TWOHOUR; 1135 } 1136 1137 /* The 2 hour rule is not imposed for preferred lifetime. */ 1138 lt6_tmp.ia6t_pltime = new->ndpr_pltime; 1139 1140 in6_init_address_ltimes(pr, <6_tmp); 1141 1142 /* 1143 * When adjusting the lifetimes of an existing temporary 1144 * address, only lower the lifetimes. 1145 * RFC 3041 3.3. (1). 1146 * XXX: how should we modify ia6t_[pv]ltime? 1147 */ 1148 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0) { 1149 if (lt6_tmp.ia6t_expire == 0 || /* no expire */ 1150 lt6_tmp.ia6t_expire > 1151 ifa6->ia6_lifetime.ia6t_expire) { 1152 lt6_tmp.ia6t_expire = 1153 ifa6->ia6_lifetime.ia6t_expire; 1154 } 1155 if (lt6_tmp.ia6t_preferred == 0 || /* no expire */ 1156 lt6_tmp.ia6t_preferred > 1157 ifa6->ia6_lifetime.ia6t_preferred) { 1158 lt6_tmp.ia6t_preferred = 1159 ifa6->ia6_lifetime.ia6t_preferred; 1160 } 1161 } 1162 1163 ifa6->ia6_lifetime = lt6_tmp; 1164 } 1165 if (ia6_match == NULL && new->ndpr_vltime) { 1166 /* 1167 * No address matched and the valid lifetime is non-zero. 1168 * Create a new address. 1169 */ 1170 if ((ia6 = in6_ifadd(new, NULL)) != NULL) { 1171 /* 1172 * note that we should use pr (not new) for reference. 1173 */ 1174 pr->ndpr_refcnt++; 1175 ia6->ia6_ndpr = pr; 1176 1177 #if 0 1178 /* XXXYYY Don't do this, according to Jinmei. */ 1179 pr->ndpr_addr = new->ndpr_addr; 1180 #endif 1181 1182 /* 1183 * RFC 3041 3.3 (2). 1184 * When a new public address is created as described 1185 * in RFC2462, also create a new temporary address. 1186 * 1187 * RFC 3041 3.5. 1188 * When an interface connects to a new link, a new 1189 * randomized interface identifier should be generated 1190 * immediately together with a new set of temporary 1191 * addresses. Thus, we specifiy 1 as the 2nd arg of 1192 * in6_tmpifadd(). 1193 */ 1194 if (ip6_use_tempaddr) { 1195 int e; 1196 if ((e = in6_tmpifadd(ia6, 1)) != 0) { 1197 nd6log((LOG_NOTICE, "prelist_update: " 1198 "failed to create a temporary " 1199 "address, errno=%d\n", 1200 e)); 1201 } 1202 } 1203 1204 /* 1205 * A newly added address might affect the status 1206 * of other addresses, so we check and update it. 1207 * XXX: what if address duplication happens? 1208 */ 1209 pfxlist_onlink_check(); 1210 } else { 1211 /* just set an error. do not bark here. */ 1212 error = EADDRNOTAVAIL; /* XXX: might be unused. */ 1213 } 1214 } 1215 1216 afteraddrconf: 1217 1218 end: 1219 splx(s); 1220 return error; 1221 } 1222 1223 /* 1224 * A supplement function used in the on-link detection below; 1225 * detect if a given prefix has a (probably) reachable advertising router. 1226 * XXX: lengthy function name... 1227 */ 1228 static struct nd_pfxrouter * 1229 find_pfxlist_reachable_router(pr) 1230 struct nd_prefix *pr; 1231 { 1232 struct nd_pfxrouter *pfxrtr; 1233 struct rtentry *rt; 1234 struct llinfo_nd6 *ln; 1235 1236 for (pfxrtr = LIST_FIRST(&pr->ndpr_advrtrs); pfxrtr; 1237 pfxrtr = LIST_NEXT(pfxrtr, pfr_entry)) { 1238 if ((rt = nd6_lookup(&pfxrtr->router->rtaddr, 0, 1239 pfxrtr->router->ifp)) && 1240 (ln = (struct llinfo_nd6 *)rt->rt_llinfo) && 1241 ND6_IS_LLINFO_PROBREACH(ln)) 1242 break; /* found */ 1243 } 1244 1245 return(pfxrtr); 1246 1247 } 1248 1249 /* 1250 * Check if each prefix in the prefix list has at least one available router 1251 * that advertised the prefix (a router is "available" if its neighbor cache 1252 * entry is reachable or probably reachable). 1253 * If the check fails, the prefix may be off-link, because, for example, 1254 * we have moved from the network but the lifetime of the prefix has not 1255 * expired yet. So we should not use the prefix if there is another prefix 1256 * that has an available router. 1257 * But, if there is no prefix that has an available router, we still regards 1258 * all the prefixes as on-link. This is because we can't tell if all the 1259 * routers are simply dead or if we really moved from the network and there 1260 * is no router around us. 1261 */ 1262 void 1263 pfxlist_onlink_check() 1264 { 1265 struct nd_prefix *pr; 1266 struct in6_ifaddr *ifa; 1267 1268 /* 1269 * Check if there is a prefix that has a reachable advertising 1270 * router. 1271 */ 1272 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 1273 if (pr->ndpr_raf_onlink && find_pfxlist_reachable_router(pr)) 1274 break; 1275 } 1276 1277 if (pr) { 1278 /* 1279 * There is at least one prefix that has a reachable router. 1280 * Detach prefixes which have no reachable advertising 1281 * router, and attach other prefixes. 1282 */ 1283 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 1284 /* XXX: a link-local prefix should never be detached */ 1285 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr)) 1286 continue; 1287 1288 /* 1289 * we aren't interested in prefixes without the L bit 1290 * set. 1291 */ 1292 if (pr->ndpr_raf_onlink == 0) 1293 continue; 1294 1295 if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 && 1296 find_pfxlist_reachable_router(pr) == NULL) 1297 pr->ndpr_stateflags |= NDPRF_DETACHED; 1298 if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 && 1299 find_pfxlist_reachable_router(pr) != 0) 1300 pr->ndpr_stateflags &= ~NDPRF_DETACHED; 1301 } 1302 } else { 1303 /* there is no prefix that has a reachable router */ 1304 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 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_DETACHED; 1313 } 1314 } 1315 1316 /* 1317 * Remove each interface route associated with a (just) detached 1318 * prefix, and reinstall the interface route for a (just) attached 1319 * prefix. Note that all attempt of reinstallation does not 1320 * necessarily success, when a same prefix is shared among multiple 1321 * interfaces. Such cases will be handled in nd6_prefix_onlink, 1322 * so we don't have to care about them. 1323 */ 1324 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 1325 int e; 1326 1327 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr)) 1328 continue; 1329 1330 if (pr->ndpr_raf_onlink == 0) 1331 continue; 1332 1333 if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 && 1334 (pr->ndpr_stateflags & NDPRF_ONLINK) != 0) { 1335 if ((e = nd6_prefix_offlink(pr)) != 0) { 1336 nd6log((LOG_ERR, 1337 "pfxlist_onlink_check: failed to " 1338 "make %s/%d offlink, errno=%d\n", 1339 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 1340 pr->ndpr_plen, e)); 1341 } 1342 } 1343 if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 && 1344 (pr->ndpr_stateflags & NDPRF_ONLINK) == 0 && 1345 pr->ndpr_raf_onlink) { 1346 if ((e = nd6_prefix_onlink(pr)) != 0) { 1347 nd6log((LOG_ERR, 1348 "pfxlist_onlink_check: failed to " 1349 "make %s/%d offlink, errno=%d\n", 1350 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 1351 pr->ndpr_plen, e)); 1352 } 1353 } 1354 } 1355 1356 /* 1357 * Changes on the prefix status might affect address status as well. 1358 * Make sure that all addresses derived from an attached prefix are 1359 * attached, and that all addresses derived from a detached prefix are 1360 * detached. Note, however, that a manually configured address should 1361 * always be attached. 1362 * The precise detection logic is same as the one for prefixes. 1363 */ 1364 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) { 1365 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0) 1366 continue; 1367 1368 if (ifa->ia6_ndpr == NULL) { 1369 /* 1370 * This can happen when we first configure the address 1371 * (i.e. the address exists, but the prefix does not). 1372 * XXX: complicated relationships... 1373 */ 1374 continue; 1375 } 1376 1377 if (find_pfxlist_reachable_router(ifa->ia6_ndpr)) 1378 break; 1379 } 1380 if (ifa) { 1381 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) { 1382 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0) 1383 continue; 1384 1385 if (ifa->ia6_ndpr == NULL) /* XXX: see above. */ 1386 continue; 1387 1388 if (find_pfxlist_reachable_router(ifa->ia6_ndpr)) 1389 ifa->ia6_flags &= ~IN6_IFF_DETACHED; 1390 else 1391 ifa->ia6_flags |= IN6_IFF_DETACHED; 1392 } 1393 } 1394 else { 1395 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) { 1396 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0) 1397 continue; 1398 1399 ifa->ia6_flags &= ~IN6_IFF_DETACHED; 1400 } 1401 } 1402 } 1403 1404 int 1405 nd6_prefix_onlink(pr) 1406 struct nd_prefix *pr; 1407 { 1408 struct ifaddr *ifa; 1409 struct ifnet *ifp = pr->ndpr_ifp; 1410 struct sockaddr_in6 mask6; 1411 struct nd_prefix *opr; 1412 u_long rtflags; 1413 int error = 0; 1414 struct rtentry *rt = NULL; 1415 1416 /* sanity check */ 1417 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0) { 1418 nd6log((LOG_ERR, 1419 "nd6_prefix_onlink: %s/%d is already on-link\n", 1420 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen); 1421 return(EEXIST)); 1422 } 1423 1424 /* 1425 * Add the interface route associated with the prefix. Before 1426 * installing the route, check if there's the same prefix on another 1427 * interface, and the prefix has already installed the interface route. 1428 * Although such a configuration is expected to be rare, we explicitly 1429 * allow it. 1430 */ 1431 for (opr = nd_prefix.lh_first; opr; opr = opr->ndpr_next) { 1432 if (opr == pr) 1433 continue; 1434 1435 if ((opr->ndpr_stateflags & NDPRF_ONLINK) == 0) 1436 continue; 1437 1438 if (opr->ndpr_plen == pr->ndpr_plen && 1439 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr, 1440 &opr->ndpr_prefix.sin6_addr, 1441 pr->ndpr_plen)) 1442 return(0); 1443 } 1444 1445 /* 1446 * We prefer link-local addresses as the associated interface address. 1447 */ 1448 /* search for a link-local addr */ 1449 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 1450 IN6_IFF_NOTREADY| 1451 IN6_IFF_ANYCAST); 1452 if (ifa == NULL) { 1453 /* XXX: freebsd does not have ifa_ifwithaf */ 1454 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 1455 { 1456 if (ifa->ifa_addr->sa_family == AF_INET6) 1457 break; 1458 } 1459 /* should we care about ia6_flags? */ 1460 } 1461 if (ifa == NULL) { 1462 /* 1463 * This can still happen, when, for example, we receive an RA 1464 * containing a prefix with the L bit set and the A bit clear, 1465 * after removing all IPv6 addresses on the receiving 1466 * interface. This should, of course, be rare though. 1467 */ 1468 nd6log((LOG_NOTICE, 1469 "nd6_prefix_onlink: failed to find any ifaddr" 1470 " to add route for a prefix(%s/%d) on %s\n", 1471 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 1472 pr->ndpr_plen, if_name(ifp))); 1473 return(0); 1474 } 1475 1476 /* 1477 * in6_ifinit() sets nd6_rtrequest to ifa_rtrequest for all ifaddrs. 1478 * ifa->ifa_rtrequest = nd6_rtrequest; 1479 */ 1480 bzero(&mask6, sizeof(mask6)); 1481 mask6.sin6_len = sizeof(mask6); 1482 mask6.sin6_addr = pr->ndpr_mask; 1483 rtflags = ifa->ifa_flags | RTF_CLONING | RTF_UP; 1484 if (nd6_need_cache(ifp)) { 1485 /* explicitly set in case ifa_flags does not set the flag. */ 1486 rtflags |= RTF_CLONING; 1487 } else { 1488 /* 1489 * explicitly clear the cloning bit in case ifa_flags sets it. 1490 */ 1491 rtflags &= ~RTF_CLONING; 1492 } 1493 error = rtrequest(RTM_ADD, (struct sockaddr *)&pr->ndpr_prefix, 1494 ifa->ifa_addr, (struct sockaddr *)&mask6, 1495 rtflags, &rt); 1496 if (error == 0) { 1497 if (rt != NULL) /* this should be non NULL, though */ 1498 nd6_rtmsg(RTM_ADD, rt); 1499 pr->ndpr_stateflags |= NDPRF_ONLINK; 1500 } 1501 else { 1502 nd6log((LOG_ERR, "nd6_prefix_onlink: failed to add route for a" 1503 " prefix (%s/%d) on %s, gw=%s, mask=%s, flags=%lx " 1504 "errno = %d\n", 1505 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 1506 pr->ndpr_plen, if_name(ifp), 1507 ip6_sprintf(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr), 1508 ip6_sprintf(&mask6.sin6_addr), rtflags, error)); 1509 } 1510 1511 if (rt != NULL) 1512 rt->rt_refcnt--; 1513 1514 return(error); 1515 } 1516 1517 int 1518 nd6_prefix_offlink(pr) 1519 struct nd_prefix *pr; 1520 { 1521 int error = 0; 1522 struct ifnet *ifp = pr->ndpr_ifp; 1523 struct nd_prefix *opr; 1524 struct sockaddr_in6 sa6, mask6; 1525 struct rtentry *rt = NULL; 1526 1527 /* sanity check */ 1528 if ((pr->ndpr_stateflags & NDPRF_ONLINK) == 0) { 1529 nd6log((LOG_ERR, 1530 "nd6_prefix_offlink: %s/%d is already off-link\n", 1531 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen)); 1532 return(EEXIST); 1533 } 1534 1535 bzero(&sa6, sizeof(sa6)); 1536 sa6.sin6_family = AF_INET6; 1537 sa6.sin6_len = sizeof(sa6); 1538 bcopy(&pr->ndpr_prefix.sin6_addr, &sa6.sin6_addr, 1539 sizeof(struct in6_addr)); 1540 bzero(&mask6, sizeof(mask6)); 1541 mask6.sin6_family = AF_INET6; 1542 mask6.sin6_len = sizeof(sa6); 1543 bcopy(&pr->ndpr_mask, &mask6.sin6_addr, sizeof(struct in6_addr)); 1544 error = rtrequest(RTM_DELETE, (struct sockaddr *)&sa6, NULL, 1545 (struct sockaddr *)&mask6, 0, &rt); 1546 if (error == 0) { 1547 pr->ndpr_stateflags &= ~NDPRF_ONLINK; 1548 1549 /* report the route deletion to the routing socket. */ 1550 if (rt != NULL) 1551 nd6_rtmsg(RTM_DELETE, rt); 1552 1553 /* 1554 * There might be the same prefix on another interface, 1555 * the prefix which could not be on-link just because we have 1556 * the interface route (see comments in nd6_prefix_onlink). 1557 * If there's one, try to make the prefix on-link on the 1558 * interface. 1559 */ 1560 for (opr = nd_prefix.lh_first; opr; opr = opr->ndpr_next) { 1561 if (opr == pr) 1562 continue; 1563 1564 if ((opr->ndpr_stateflags & NDPRF_ONLINK) != 0) 1565 continue; 1566 1567 /* 1568 * KAME specific: detached prefixes should not be 1569 * on-link. 1570 */ 1571 if ((opr->ndpr_stateflags & NDPRF_DETACHED) != 0) 1572 continue; 1573 1574 if (opr->ndpr_plen == pr->ndpr_plen && 1575 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr, 1576 &opr->ndpr_prefix.sin6_addr, 1577 pr->ndpr_plen)) { 1578 int e; 1579 1580 if ((e = nd6_prefix_onlink(opr)) != 0) { 1581 nd6log((LOG_ERR, 1582 "nd6_prefix_offlink: failed to " 1583 "recover a prefix %s/%d from %s " 1584 "to %s (errno = %d)\n", 1585 ip6_sprintf(&opr->ndpr_prefix.sin6_addr), 1586 opr->ndpr_plen, if_name(ifp), 1587 if_name(opr->ndpr_ifp), e)); 1588 } 1589 } 1590 } 1591 } 1592 else { 1593 /* XXX: can we still set the NDPRF_ONLINK flag? */ 1594 nd6log((LOG_ERR, 1595 "nd6_prefix_offlink: failed to delete route: " 1596 "%s/%d on %s (errno = %d)\n", 1597 ip6_sprintf(&sa6.sin6_addr), pr->ndpr_plen, if_name(ifp), 1598 error)); 1599 } 1600 1601 if (rt != NULL) { 1602 if (rt->rt_refcnt <= 0) { 1603 /* XXX: we should free the entry ourselves. */ 1604 rt->rt_refcnt++; 1605 rtfree(rt); 1606 } 1607 } 1608 1609 return(error); 1610 } 1611 1612 static struct in6_ifaddr * 1613 in6_ifadd(pr, ifid) 1614 struct nd_prefix *pr; 1615 struct in6_addr *ifid; /* Mobile IPv6 addition */ 1616 { 1617 struct ifnet *ifp = pr->ndpr_ifp; 1618 struct ifaddr *ifa; 1619 struct in6_aliasreq ifra; 1620 struct in6_ifaddr *ia, *ib; 1621 int error, plen0; 1622 struct in6_addr mask; 1623 int prefixlen = pr->ndpr_plen; 1624 1625 in6_len2mask(&mask, prefixlen); 1626 1627 /* 1628 * find a link-local address (will be interface ID). 1629 * Is it really mandatory? Theoretically, a global or a site-local 1630 * address can be configured without a link-local address, if we 1631 * have a unique interface identifier... 1632 * 1633 * it is not mandatory to have a link-local address, we can generate 1634 * interface identifier on the fly. we do this because: 1635 * (1) it should be the easiest way to find interface identifier. 1636 * (2) RFC2462 5.4 suggesting the use of the same interface identifier 1637 * for multiple addresses on a single interface, and possible shortcut 1638 * of DAD. we omitted DAD for this reason in the past. 1639 * (3) a user can prevent autoconfiguration of global address 1640 * by removing link-local address by hand (this is partly because we 1641 * don't have other way to control the use of IPv6 on a interface. 1642 * this has been our design choice - cf. NRL's "ifconfig auto"). 1643 * (4) it is easier to manage when an interface has addresses 1644 * with the same interface identifier, than to have multiple addresses 1645 * with different interface identifiers. 1646 * 1647 * Mobile IPv6 addition: allow for caller to specify a wished interface 1648 * ID. This is to not break connections when moving addresses between 1649 * interfaces. 1650 */ 1651 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0);/* 0 is OK? */ 1652 if (ifa) 1653 ib = (struct in6_ifaddr *)ifa; 1654 else 1655 return NULL; 1656 1657 #if 0 /* don't care link local addr state, and always do DAD */ 1658 /* if link-local address is not eligible, do not autoconfigure. */ 1659 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) { 1660 printf("in6_ifadd: link-local address not ready\n"); 1661 return NULL; 1662 } 1663 #endif 1664 1665 /* prefixlen + ifidlen must be equal to 128 */ 1666 plen0 = in6_mask2len(&ib->ia_prefixmask.sin6_addr, NULL); 1667 if (prefixlen != plen0) { 1668 nd6log((LOG_INFO, "in6_ifadd: wrong prefixlen for %s " 1669 "(prefix=%d ifid=%d)\n", 1670 if_name(ifp), prefixlen, 128 - plen0)); 1671 return NULL; 1672 } 1673 1674 /* make ifaddr */ 1675 1676 bzero(&ifra, sizeof(ifra)); 1677 /* 1678 * in6_update_ifa() does not use ifra_name, but we accurately set it 1679 * for safety. 1680 */ 1681 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 1682 ifra.ifra_addr.sin6_family = AF_INET6; 1683 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 1684 /* prefix */ 1685 bcopy(&pr->ndpr_prefix.sin6_addr, &ifra.ifra_addr.sin6_addr, 1686 sizeof(ifra.ifra_addr.sin6_addr)); 1687 ifra.ifra_addr.sin6_addr.s6_addr32[0] &= mask.s6_addr32[0]; 1688 ifra.ifra_addr.sin6_addr.s6_addr32[1] &= mask.s6_addr32[1]; 1689 ifra.ifra_addr.sin6_addr.s6_addr32[2] &= mask.s6_addr32[2]; 1690 ifra.ifra_addr.sin6_addr.s6_addr32[3] &= mask.s6_addr32[3]; 1691 1692 /* interface ID */ 1693 if (ifid == NULL || IN6_IS_ADDR_UNSPECIFIED(ifid)) 1694 ifid = &ib->ia_addr.sin6_addr; 1695 ifra.ifra_addr.sin6_addr.s6_addr32[0] 1696 |= (ifid->s6_addr32[0] & ~mask.s6_addr32[0]); 1697 ifra.ifra_addr.sin6_addr.s6_addr32[1] 1698 |= (ifid->s6_addr32[1] & ~mask.s6_addr32[1]); 1699 ifra.ifra_addr.sin6_addr.s6_addr32[2] 1700 |= (ifid->s6_addr32[2] & ~mask.s6_addr32[2]); 1701 ifra.ifra_addr.sin6_addr.s6_addr32[3] 1702 |= (ifid->s6_addr32[3] & ~mask.s6_addr32[3]); 1703 1704 /* new prefix mask. */ 1705 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 1706 ifra.ifra_prefixmask.sin6_family = AF_INET6; 1707 bcopy(&mask, &ifra.ifra_prefixmask.sin6_addr, 1708 sizeof(ifra.ifra_prefixmask.sin6_addr)); 1709 1710 /* 1711 * lifetime. 1712 * XXX: in6_init_address_ltimes would override these values later. 1713 * We should reconsider this logic. 1714 */ 1715 ifra.ifra_lifetime.ia6t_vltime = pr->ndpr_vltime; 1716 ifra.ifra_lifetime.ia6t_pltime = pr->ndpr_pltime; 1717 1718 /* XXX: scope zone ID? */ 1719 1720 ifra.ifra_flags |= IN6_IFF_AUTOCONF; /* obey autoconf */ 1721 /* 1722 * temporarily set the nopfx flag to avoid conflict. 1723 * XXX: we should reconsider the entire mechanism about prefix 1724 * manipulation. 1725 */ 1726 ifra.ifra_flags |= IN6_IFF_NOPFX; 1727 1728 /* 1729 * keep the new address, regardless of the result of in6_update_ifa. 1730 * XXX: this address is now meaningless. 1731 * We should reconsider its role. 1732 */ 1733 pr->ndpr_addr = ifra.ifra_addr.sin6_addr; 1734 1735 /* allocate ifaddr structure, link into chain, etc. */ 1736 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) { 1737 nd6log((LOG_ERR, 1738 "in6_ifadd: failed to make ifaddr %s on %s (errno=%d)\n", 1739 ip6_sprintf(&ifra.ifra_addr.sin6_addr), if_name(ifp), 1740 error)); 1741 return(NULL); /* ifaddr must not have been allocated. */ 1742 } 1743 1744 ia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr); 1745 1746 return(ia); /* this must NOT be NULL. */ 1747 } 1748 1749 int 1750 in6_tmpifadd(ia0, forcegen) 1751 const struct in6_ifaddr *ia0; /* corresponding public address */ 1752 { 1753 struct ifnet *ifp = ia0->ia_ifa.ifa_ifp; 1754 struct in6_ifaddr *newia; 1755 struct in6_aliasreq ifra; 1756 int i, error; 1757 int trylimit = 3; /* XXX: adhoc value */ 1758 u_int32_t randid[2]; 1759 time_t vltime0, pltime0; 1760 1761 bzero(&ifra, sizeof(ifra)); 1762 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 1763 ifra.ifra_addr = ia0->ia_addr; 1764 /* copy prefix mask */ 1765 ifra.ifra_prefixmask = ia0->ia_prefixmask; 1766 /* clear the old IFID */ 1767 for (i = 0; i < 4; i++) { 1768 ifra.ifra_addr.sin6_addr.s6_addr32[i] 1769 &= ifra.ifra_prefixmask.sin6_addr.s6_addr32[i]; 1770 } 1771 1772 again: 1773 in6_get_tmpifid(ifp, (u_int8_t *)randid, 1774 (const u_int8_t *)&ia0->ia_addr.sin6_addr.s6_addr[8], 1775 forcegen); 1776 ifra.ifra_addr.sin6_addr.s6_addr32[2] 1777 |= (randid[0] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[2])); 1778 ifra.ifra_addr.sin6_addr.s6_addr32[3] 1779 |= (randid[1] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[3])); 1780 1781 /* 1782 * If by chance the new temporary address is the same as an address 1783 * already assigned to the interface, generate a new randomized 1784 * interface identifier and repeat this step. 1785 * RFC 3041 3.3 (4). 1786 */ 1787 if (in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr) != NULL) { 1788 if (trylimit-- == 0) { 1789 nd6log((LOG_NOTICE, "in6_tmpifadd: failed to find " 1790 "a unique random IFID\n")); 1791 return(EEXIST); 1792 } 1793 forcegen = 1; 1794 goto again; 1795 } 1796 1797 /* 1798 * The Valid Lifetime is the lower of the Valid Lifetime of the 1799 * public address or TEMP_VALID_LIFETIME. 1800 * The Preferred Lifetime is the lower of the Preferred Lifetime 1801 * of the public address or TEMP_PREFERRED_LIFETIME - 1802 * DESYNC_FACTOR. 1803 */ 1804 if (ia0->ia6_lifetime.ia6t_expire != 0) { 1805 vltime0 = IFA6_IS_INVALID(ia0) ? 0 : 1806 (ia0->ia6_lifetime.ia6t_expire - time_second); 1807 if (vltime0 > ip6_temp_valid_lifetime) 1808 vltime0 = ip6_temp_valid_lifetime; 1809 } else 1810 vltime0 = ip6_temp_valid_lifetime; 1811 if (ia0->ia6_lifetime.ia6t_preferred != 0) { 1812 pltime0 = IFA6_IS_DEPRECATED(ia0) ? 0 : 1813 (ia0->ia6_lifetime.ia6t_preferred - time_second); 1814 if (pltime0 > ip6_temp_preferred_lifetime - ip6_desync_factor) { 1815 pltime0 = ip6_temp_preferred_lifetime - 1816 ip6_desync_factor; 1817 } 1818 } else 1819 pltime0 = ip6_temp_preferred_lifetime - ip6_desync_factor; 1820 ifra.ifra_lifetime.ia6t_vltime = vltime0; 1821 ifra.ifra_lifetime.ia6t_pltime = pltime0; 1822 1823 /* 1824 * A temporary address is created only if this calculated Preferred 1825 * Lifetime is greater than REGEN_ADVANCE time units. 1826 */ 1827 if (ifra.ifra_lifetime.ia6t_pltime <= ip6_temp_regen_advance) 1828 return(0); 1829 1830 /* XXX: scope zone ID? */ 1831 1832 ifra.ifra_flags |= (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY); 1833 1834 /* allocate ifaddr structure, link into chain, etc. */ 1835 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) 1836 return(error); 1837 1838 newia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr); 1839 if (newia == NULL) { /* XXX: can it happen? */ 1840 nd6log((LOG_ERR, 1841 "in6_tmpifadd: ifa update succeeded, but we got " 1842 "no ifaddr\n")); 1843 return(EINVAL); /* XXX */ 1844 } 1845 newia->ia6_ndpr = ia0->ia6_ndpr; 1846 newia->ia6_ndpr->ndpr_refcnt++; 1847 1848 return(0); 1849 } 1850 1851 int 1852 in6_init_prefix_ltimes(struct nd_prefix *ndpr) 1853 { 1854 /* check if preferred lifetime > valid lifetime. RFC2462 5.5.3 (c) */ 1855 if (ndpr->ndpr_pltime > ndpr->ndpr_vltime) { 1856 nd6log((LOG_INFO, "in6_init_prefix_ltimes: preferred lifetime" 1857 "(%d) is greater than valid lifetime(%d)\n", 1858 (u_int)ndpr->ndpr_pltime, (u_int)ndpr->ndpr_vltime)); 1859 return (EINVAL); 1860 } 1861 if (ndpr->ndpr_pltime == ND6_INFINITE_LIFETIME) 1862 ndpr->ndpr_preferred = 0; 1863 else 1864 ndpr->ndpr_preferred = time_second + ndpr->ndpr_pltime; 1865 if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME) 1866 ndpr->ndpr_expire = 0; 1867 else 1868 ndpr->ndpr_expire = time_second + ndpr->ndpr_vltime; 1869 1870 return 0; 1871 } 1872 1873 static void 1874 in6_init_address_ltimes(struct nd_prefix *new, struct in6_addrlifetime *lt6) 1875 { 1876 /* init ia6t_expire */ 1877 if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME) 1878 lt6->ia6t_expire = 0; 1879 else { 1880 lt6->ia6t_expire = time_second; 1881 lt6->ia6t_expire += lt6->ia6t_vltime; 1882 } 1883 1884 /* init ia6t_preferred */ 1885 if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME) 1886 lt6->ia6t_preferred = 0; 1887 else { 1888 lt6->ia6t_preferred = time_second; 1889 lt6->ia6t_preferred += lt6->ia6t_pltime; 1890 } 1891 } 1892 1893 /* 1894 * Delete all the routing table entries that use the specified gateway. 1895 * XXX: this function causes search through all entries of routing table, so 1896 * it shouldn't be called when acting as a router. 1897 */ 1898 void 1899 rt6_flush(gateway, ifp) 1900 struct in6_addr *gateway; 1901 struct ifnet *ifp; 1902 { 1903 struct radix_node_head *rnh = rt_tables[AF_INET6]; 1904 int s = splnet(); 1905 1906 /* We'll care only link-local addresses */ 1907 if (!IN6_IS_ADDR_LINKLOCAL(gateway)) { 1908 splx(s); 1909 return; 1910 } 1911 /* XXX: hack for KAME's link-local address kludge */ 1912 gateway->s6_addr16[1] = htons(ifp->if_index); 1913 1914 rnh->rnh_walktree(rnh, rt6_deleteroute, (void *)gateway); 1915 splx(s); 1916 } 1917 1918 static int 1919 rt6_deleteroute(rn, arg) 1920 struct radix_node *rn; 1921 void *arg; 1922 { 1923 #define SIN6(s) ((struct sockaddr_in6 *)s) 1924 struct rtentry *rt = (struct rtentry *)rn; 1925 struct in6_addr *gate = (struct in6_addr *)arg; 1926 1927 if (rt->rt_gateway == NULL || rt->rt_gateway->sa_family != AF_INET6) 1928 return(0); 1929 1930 if (!IN6_ARE_ADDR_EQUAL(gate, &SIN6(rt->rt_gateway)->sin6_addr)) 1931 return(0); 1932 1933 /* 1934 * Do not delete a static route. 1935 * XXX: this seems to be a bit ad-hoc. Should we consider the 1936 * 'cloned' bit instead? 1937 */ 1938 if ((rt->rt_flags & RTF_STATIC) != 0) 1939 return(0); 1940 1941 /* 1942 * We delete only host route. This means, in particular, we don't 1943 * delete default route. 1944 */ 1945 if ((rt->rt_flags & RTF_HOST) == 0) 1946 return(0); 1947 1948 return(rtrequest(RTM_DELETE, rt_key(rt), 1949 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0)); 1950 #undef SIN6 1951 } 1952 1953 int 1954 nd6_setdefaultiface(ifindex) 1955 int ifindex; 1956 { 1957 int error = 0; 1958 1959 if (ifindex < 0 || if_index < ifindex) 1960 return(EINVAL); 1961 1962 if (nd6_defifindex != ifindex) { 1963 nd6_defifindex = ifindex; 1964 if (nd6_defifindex > 0) 1965 nd6_defifp = ifindex2ifnet[nd6_defifindex]; 1966 else 1967 nd6_defifp = NULL; 1968 1969 /* 1970 * If the Default Router List is empty, install a route 1971 * to the specified interface as default or remove the default 1972 * route when the default interface becomes canceled. 1973 * The check for the queue is actually redundant, but 1974 * we do this here to avoid re-install the default route 1975 * if the list is NOT empty. 1976 */ 1977 if (TAILQ_FIRST(&nd_defrouter) == NULL) 1978 defrouter_select(); 1979 1980 /* 1981 * Our current implementation assumes one-to-one maping between 1982 * interfaces and links, so it would be natural to use the 1983 * default interface as the default link. 1984 */ 1985 scope6_setdefault(nd6_defifp); 1986 } 1987 1988 return(error); 1989 } 1990