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 1.17 2008/03/07 11:34:21 sephe 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 #include <sys/globaldata.h> 49 #include <sys/thread2.h> 50 51 #include <net/if.h> 52 #include <net/if_types.h> 53 #include <net/if_dl.h> 54 #include <net/route.h> 55 #include <net/radix.h> 56 57 #include <netinet/in.h> 58 #include <netinet6/in6_var.h> 59 #include <netinet6/in6_ifattach.h> 60 #include <netinet/ip6.h> 61 #include <netinet6/ip6_var.h> 62 #include <netinet6/nd6.h> 63 #include <netinet/icmp6.h> 64 #include <netinet6/scope6_var.h> 65 66 #include <net/net_osdep.h> 67 68 #define SDL(s) ((struct sockaddr_dl *)s) 69 70 static struct nd_defrouter *defrtrlist_update (struct nd_defrouter *); 71 static struct in6_ifaddr *in6_ifadd (struct nd_prefix *, 72 struct in6_addr *); 73 static struct nd_pfxrouter *pfxrtr_lookup (struct nd_prefix *, 74 struct nd_defrouter *); 75 static void pfxrtr_add (struct nd_prefix *, struct nd_defrouter *); 76 static void pfxrtr_del (struct nd_pfxrouter *); 77 static struct nd_pfxrouter *find_pfxlist_reachable_router 78 (struct nd_prefix *); 79 static void defrouter_addifreq (struct ifnet *); 80 static void nd6_rtmsg (int, struct rtentry *); 81 82 static void in6_init_address_ltimes (struct nd_prefix *ndpr, 83 struct in6_addrlifetime *lt6); 84 85 static int rt6_deleteroute (struct radix_node *, void *); 86 87 extern int nd6_recalc_reachtm_interval; 88 89 static struct ifnet *nd6_defifp; 90 int nd6_defifindex; 91 92 int ip6_use_tempaddr = 0; 93 94 int ip6_desync_factor; 95 u_int32_t ip6_temp_preferred_lifetime = DEF_TEMP_PREFERRED_LIFETIME; 96 u_int32_t ip6_temp_valid_lifetime = DEF_TEMP_VALID_LIFETIME; 97 /* 98 * shorter lifetimes for debugging purposes. 99 int ip6_temp_preferred_lifetime = 800; 100 static int ip6_temp_valid_lifetime = 1800; 101 */ 102 int ip6_temp_regen_advance = TEMPADDR_REGEN_ADVANCE; 103 104 /* 105 * Receive Router Solicitation Message - just for routers. 106 * Router solicitation/advertisement is mostly managed by userland program 107 * (rtadvd) so here we have no function like nd6_ra_output(). 108 * 109 * Based on RFC 2461 110 */ 111 void 112 nd6_rs_input(struct mbuf *m, int off, int icmp6len) 113 { 114 struct ifnet *ifp = m->m_pkthdr.rcvif; 115 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 116 struct nd_router_solicit *nd_rs; 117 struct in6_addr saddr6 = ip6->ip6_src; 118 #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 = NULL; 125 struct llinfo_nd6 *ln = 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(struct mbuf *m, int off, int icmp6len) 204 { 205 struct ifnet *ifp = m->m_pkthdr.rcvif; 206 struct nd_ifinfo *ndi = ND_IFINFO(ifp); 207 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 208 struct nd_router_advert *nd_ra; 209 struct in6_addr saddr6 = ip6->ip6_src; 210 #if 0 211 struct in6_addr daddr6 = ip6->ip6_dst; 212 int flags; /* = nd_ra->nd_ra_flags_reserved; */ 213 int is_managed = ((flags & ND_RA_FLAG_MANAGED) != 0); 214 int is_other = ((flags & ND_RA_FLAG_OTHER) != 0); 215 #endif 216 union nd_opts ndopts; 217 struct nd_defrouter *dr; 218 219 /* 220 * We only accept RAs only when 221 * the system-wide variable allows the acceptance, and 222 * per-interface variable allows RAs on the receiving interface. 223 */ 224 if (ip6_accept_rtadv == 0) 225 goto freeit; 226 if (!(ndi->flags & ND6_IFF_ACCEPT_RTADV)) 227 goto freeit; 228 229 if (ip6->ip6_hlim != 255) { 230 nd6log((LOG_ERR, 231 "nd6_ra_input: invalid hlim (%d) from %s to %s on %s\n", 232 ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src), 233 ip6_sprintf(&ip6->ip6_dst), if_name(ifp))); 234 goto bad; 235 } 236 237 if (!IN6_IS_ADDR_LINKLOCAL(&saddr6)) { 238 nd6log((LOG_ERR, 239 "nd6_ra_input: src %s is not link-local\n", 240 ip6_sprintf(&saddr6))); 241 goto bad; 242 } 243 244 #ifndef PULLDOWN_TEST 245 IP6_EXTHDR_CHECK(m, off, icmp6len,); 246 nd_ra = (struct nd_router_advert *)((caddr_t)ip6 + off); 247 #else 248 IP6_EXTHDR_GET(nd_ra, struct nd_router_advert *, m, off, icmp6len); 249 if (nd_ra == NULL) { 250 icmp6stat.icp6s_tooshort++; 251 return; 252 } 253 #endif 254 255 icmp6len -= sizeof(*nd_ra); 256 nd6_option_init(nd_ra + 1, icmp6len, &ndopts); 257 if (nd6_options(&ndopts) < 0) { 258 nd6log((LOG_INFO, 259 "nd6_ra_input: invalid ND option, ignored\n")); 260 /* nd6_options have incremented stats */ 261 goto freeit; 262 } 263 264 { 265 struct nd_defrouter dr0; 266 u_int32_t advreachable = nd_ra->nd_ra_reachable; 267 268 dr0.rtaddr = saddr6; 269 dr0.flags = nd_ra->nd_ra_flags_reserved; 270 dr0.rtlifetime = ntohs(nd_ra->nd_ra_router_lifetime); 271 dr0.expire = time_second + dr0.rtlifetime; 272 dr0.ifp = ifp; 273 dr0.advint = 0; /* Mobile IPv6 */ 274 dr0.advint_expire = 0; /* Mobile IPv6 */ 275 dr0.advints_lost = 0; /* Mobile IPv6 */ 276 /* unspecified or not? (RFC 2461 6.3.4) */ 277 if (advreachable) { 278 advreachable = ntohl(advreachable); 279 if (advreachable <= MAX_REACHABLE_TIME && 280 ndi->basereachable != advreachable) { 281 ndi->basereachable = advreachable; 282 ndi->reachable = ND_COMPUTE_RTIME(ndi->basereachable); 283 ndi->recalctm = nd6_recalc_reachtm_interval; /* reset */ 284 } 285 } 286 if (nd_ra->nd_ra_retransmit) 287 ndi->retrans = ntohl(nd_ra->nd_ra_retransmit); 288 if (nd_ra->nd_ra_curhoplimit) 289 ndi->chlim = nd_ra->nd_ra_curhoplimit; 290 dr = defrtrlist_update(&dr0); 291 } 292 293 /* 294 * prefix 295 */ 296 if (ndopts.nd_opts_pi) { 297 struct nd_opt_hdr *pt; 298 struct nd_opt_prefix_info *pi = NULL; 299 struct nd_prefix pr; 300 301 for (pt = (struct nd_opt_hdr *)ndopts.nd_opts_pi; 302 pt <= (struct nd_opt_hdr *)ndopts.nd_opts_pi_end; 303 pt = (struct nd_opt_hdr *)((caddr_t)pt + 304 (pt->nd_opt_len << 3))) { 305 if (pt->nd_opt_type != ND_OPT_PREFIX_INFORMATION) 306 continue; 307 pi = (struct nd_opt_prefix_info *)pt; 308 309 if (pi->nd_opt_pi_len != 4) { 310 nd6log((LOG_INFO, 311 "nd6_ra_input: invalid option " 312 "len %d for prefix information option, " 313 "ignored\n", pi->nd_opt_pi_len)); 314 continue; 315 } 316 317 if (128 < pi->nd_opt_pi_prefix_len) { 318 nd6log((LOG_INFO, 319 "nd6_ra_input: invalid prefix " 320 "len %d for prefix information option, " 321 "ignored\n", pi->nd_opt_pi_prefix_len)); 322 continue; 323 } 324 325 if (IN6_IS_ADDR_MULTICAST(&pi->nd_opt_pi_prefix) 326 || IN6_IS_ADDR_LINKLOCAL(&pi->nd_opt_pi_prefix)) { 327 nd6log((LOG_INFO, 328 "nd6_ra_input: invalid prefix " 329 "%s, ignored\n", 330 ip6_sprintf(&pi->nd_opt_pi_prefix))); 331 continue; 332 } 333 334 /* aggregatable unicast address, rfc2374 */ 335 if ((pi->nd_opt_pi_prefix.s6_addr8[0] & 0xe0) == 0x20 336 && pi->nd_opt_pi_prefix_len != 64) { 337 nd6log((LOG_INFO, 338 "nd6_ra_input: invalid prefixlen " 339 "%d for rfc2374 prefix %s, ignored\n", 340 pi->nd_opt_pi_prefix_len, 341 ip6_sprintf(&pi->nd_opt_pi_prefix))); 342 continue; 343 } 344 345 bzero(&pr, sizeof(pr)); 346 pr.ndpr_prefix.sin6_family = AF_INET6; 347 pr.ndpr_prefix.sin6_len = sizeof(pr.ndpr_prefix); 348 pr.ndpr_prefix.sin6_addr = pi->nd_opt_pi_prefix; 349 pr.ndpr_ifp = (struct ifnet *)m->m_pkthdr.rcvif; 350 351 pr.ndpr_raf_onlink = (pi->nd_opt_pi_flags_reserved & 352 ND_OPT_PI_FLAG_ONLINK) ? 1 : 0; 353 pr.ndpr_raf_auto = (pi->nd_opt_pi_flags_reserved & 354 ND_OPT_PI_FLAG_AUTO) ? 1 : 0; 355 pr.ndpr_plen = pi->nd_opt_pi_prefix_len; 356 pr.ndpr_vltime = ntohl(pi->nd_opt_pi_valid_time); 357 pr.ndpr_pltime = 358 ntohl(pi->nd_opt_pi_preferred_time); 359 360 if (in6_init_prefix_ltimes(&pr)) 361 continue; /* prefix lifetime init failed */ 362 363 prelist_update(&pr, dr, m); 364 } 365 } 366 367 /* 368 * MTU 369 */ 370 if (ndopts.nd_opts_mtu && ndopts.nd_opts_mtu->nd_opt_mtu_len == 1) { 371 u_int32_t mtu = ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu); 372 373 /* lower bound */ 374 if (mtu < IPV6_MMTU) { 375 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu option " 376 "mtu=%d sent from %s, ignoring\n", 377 mtu, ip6_sprintf(&ip6->ip6_src))); 378 goto skip; 379 } 380 381 /* upper bound */ 382 if (ndi->maxmtu) { 383 if (mtu <= ndi->maxmtu) { 384 int change = (ndi->linkmtu != mtu); 385 386 ndi->linkmtu = mtu; 387 if (change) /* in6_maxmtu may change */ 388 in6_setmaxmtu(); 389 } else { 390 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu " 391 "mtu=%d sent from %s; " 392 "exceeds maxmtu %d, ignoring\n", 393 mtu, ip6_sprintf(&ip6->ip6_src), 394 ndi->maxmtu)); 395 } 396 } else { 397 nd6log((LOG_INFO, "nd6_ra_input: mtu option " 398 "mtu=%d sent from %s; maxmtu unknown, " 399 "ignoring\n", 400 mtu, ip6_sprintf(&ip6->ip6_src))); 401 } 402 } 403 404 skip: 405 406 /* 407 * Source link layer address 408 */ 409 { 410 char *lladdr = NULL; 411 int lladdrlen = 0; 412 413 if (ndopts.nd_opts_src_lladdr) { 414 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1); 415 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3; 416 } 417 418 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 419 nd6log((LOG_INFO, 420 "nd6_ra_input: lladdrlen mismatch for %s " 421 "(if %d, RA packet %d)\n", 422 ip6_sprintf(&saddr6), ifp->if_addrlen, lladdrlen - 2)); 423 goto bad; 424 } 425 426 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_ADVERT, 0); 427 428 /* 429 * Installing a link-layer address might change the state of the 430 * router's neighbor cache, which might also affect our on-link 431 * detection of adveritsed prefixes. 432 */ 433 pfxlist_onlink_check(); 434 } 435 436 freeit: 437 m_freem(m); 438 return; 439 440 bad: 441 icmp6stat.icp6s_badra++; 442 m_freem(m); 443 } 444 445 /* 446 * default router list proccessing sub routines 447 */ 448 449 /* tell the change to user processes watching the routing socket. */ 450 static void 451 nd6_rtmsg(int cmd, struct rtentry *rt) 452 { 453 struct rt_addrinfo info; 454 455 bzero((caddr_t)&info, sizeof(info)); 456 info.rti_info[RTAX_DST] = rt_key(rt); 457 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 458 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 459 if (TAILQ_EMPTY(&rt->rt_ifp->if_addrheads[mycpuid])) { 460 info.rti_info[RTAX_IFP] = NULL; 461 } else { 462 info.rti_info[RTAX_IFP] = 463 (struct sockaddr *) 464 TAILQ_FIRST(&rt->rt_ifp->if_addrheads[mycpuid])->ifa; 465 } 466 info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr; 467 468 rt_missmsg(cmd, &info, rt->rt_flags, 0); 469 } 470 471 void 472 defrouter_addreq(struct nd_defrouter *new) 473 { 474 struct sockaddr_in6 def, mask, gate; 475 struct rtentry *newrt = NULL; 476 477 bzero(&def, sizeof(def)); 478 bzero(&mask, sizeof(mask)); 479 bzero(&gate, sizeof(gate)); 480 481 def.sin6_len = mask.sin6_len = gate.sin6_len 482 = sizeof(struct sockaddr_in6); 483 def.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6; 484 gate.sin6_addr = new->rtaddr; 485 486 crit_enter(); 487 rtrequest(RTM_ADD, (struct sockaddr *)&def, (struct sockaddr *)&gate, 488 (struct sockaddr *)&mask, RTF_GATEWAY, &newrt); 489 if (newrt) { 490 nd6_rtmsg(RTM_ADD, newrt); /* tell user process */ 491 newrt->rt_refcnt--; 492 } 493 crit_exit(); 494 return; 495 } 496 497 /* Add a route to a given interface as default */ 498 void 499 defrouter_addifreq(struct ifnet *ifp) 500 { 501 struct sockaddr_in6 def, mask; 502 struct ifaddr *ifa; 503 struct rtentry *newrt = NULL; 504 int error, flags; 505 506 bzero(&def, sizeof(def)); 507 bzero(&mask, sizeof(mask)); 508 509 def.sin6_len = mask.sin6_len = sizeof(struct sockaddr_in6); 510 def.sin6_family = mask.sin6_family = AF_INET6; 511 512 /* 513 * Search for an ifaddr beloging to the specified interface. 514 * XXX: An IPv6 address are required to be assigned on the interface. 515 */ 516 if ((ifa = ifaof_ifpforaddr((struct sockaddr *)&def, ifp)) == NULL) { 517 nd6log((LOG_ERR, /* better error? */ 518 "defrouter_addifreq: failed to find an ifaddr " 519 "to install a route to interface %s\n", 520 if_name(ifp))); 521 return; 522 } 523 524 flags = ifa->ifa_flags; 525 error = rtrequest(RTM_ADD, (struct sockaddr *)&def, ifa->ifa_addr, 526 (struct sockaddr *)&mask, flags, &newrt); 527 if (error != 0) { 528 nd6log((LOG_ERR, 529 "defrouter_addifreq: failed to install a route to " 530 "interface %s (errno = %d)\n", 531 if_name(ifp), error)); 532 533 if (newrt) /* maybe unnecessary, but do it for safety */ 534 newrt->rt_refcnt--; 535 } else { 536 if (newrt) { 537 nd6_rtmsg(RTM_ADD, newrt); 538 newrt->rt_refcnt--; 539 } 540 } 541 } 542 543 struct nd_defrouter * 544 defrouter_lookup(struct in6_addr *addr, struct ifnet *ifp) 545 { 546 struct nd_defrouter *dr; 547 548 for (dr = TAILQ_FIRST(&nd_defrouter); dr; 549 dr = TAILQ_NEXT(dr, dr_entry)) { 550 if (dr->ifp == ifp && IN6_ARE_ADDR_EQUAL(addr, &dr->rtaddr)) 551 return (dr); 552 } 553 554 return (NULL); /* search failed */ 555 } 556 557 void 558 defrouter_delreq(struct nd_defrouter *dr, int dofree) 559 { 560 struct sockaddr_in6 def, mask, gate; 561 struct rtentry *oldrt = NULL; 562 563 bzero(&def, sizeof(def)); 564 bzero(&mask, sizeof(mask)); 565 bzero(&gate, sizeof(gate)); 566 567 def.sin6_len = mask.sin6_len = gate.sin6_len 568 = sizeof(struct sockaddr_in6); 569 def.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6; 570 gate.sin6_addr = dr->rtaddr; 571 572 rtrequest(RTM_DELETE, (struct sockaddr *)&def, 573 (struct sockaddr *)&gate, 574 (struct sockaddr *)&mask, 575 RTF_GATEWAY, &oldrt); 576 if (oldrt) { 577 nd6_rtmsg(RTM_DELETE, oldrt); 578 if (oldrt->rt_refcnt <= 0) { 579 /* 580 * XXX: borrowed from the RTM_DELETE case of 581 * rtrequest(). 582 */ 583 oldrt->rt_refcnt++; 584 rtfree(oldrt); 585 } 586 } 587 588 if (dofree) /* XXX: necessary? */ 589 kfree(dr, M_IP6NDP); 590 } 591 592 void 593 defrtrlist_del(struct nd_defrouter *dr) 594 { 595 struct nd_defrouter *deldr = NULL; 596 struct nd_prefix *pr; 597 598 /* 599 * Flush all the routing table entries that use the router 600 * as a next hop. 601 */ 602 if (!ip6_forwarding && ip6_accept_rtadv) { 603 /* above is a good condition? */ 604 rt6_flush(&dr->rtaddr, dr->ifp); 605 } 606 607 if (dr == TAILQ_FIRST(&nd_defrouter)) 608 deldr = dr; /* The router is primary. */ 609 610 TAILQ_REMOVE(&nd_defrouter, dr, dr_entry); 611 612 /* 613 * Also delete all the pointers to the router in each prefix lists. 614 */ 615 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 616 struct nd_pfxrouter *pfxrtr; 617 if ((pfxrtr = pfxrtr_lookup(pr, dr)) != NULL) 618 pfxrtr_del(pfxrtr); 619 } 620 pfxlist_onlink_check(); 621 622 /* 623 * If the router is the primary one, choose a new one. 624 * Note that defrouter_select() will remove the current gateway 625 * from the routing table. 626 */ 627 if (deldr) 628 defrouter_select(); 629 630 kfree(dr, M_IP6NDP); 631 } 632 633 /* 634 * Default Router Selection according to Section 6.3.6 of RFC 2461: 635 * 1) Routers that are reachable or probably reachable should be 636 * preferred. 637 * 2) When no routers on the list are known to be reachable or 638 * probably reachable, routers SHOULD be selected in a round-robin 639 * fashion. 640 * 3) If the Default Router List is empty, assume that all 641 * destinations are on-link. 642 */ 643 void 644 defrouter_select(void) 645 { 646 struct nd_defrouter *dr, anydr; 647 struct rtentry *rt = NULL; 648 struct llinfo_nd6 *ln = NULL; 649 650 crit_enter(); 651 652 /* 653 * Search for a (probably) reachable router from the list. 654 */ 655 for (dr = TAILQ_FIRST(&nd_defrouter); dr; 656 dr = TAILQ_NEXT(dr, dr_entry)) { 657 if ((rt = nd6_lookup(&dr->rtaddr, 0, dr->ifp)) && 658 (ln = (struct llinfo_nd6 *)rt->rt_llinfo) && 659 ND6_IS_LLINFO_PROBREACH(ln)) { 660 /* Got it, and move it to the head */ 661 TAILQ_REMOVE(&nd_defrouter, dr, dr_entry); 662 TAILQ_INSERT_HEAD(&nd_defrouter, dr, dr_entry); 663 break; 664 } 665 } 666 667 if ((dr = TAILQ_FIRST(&nd_defrouter))) { 668 /* 669 * De-install the previous default gateway and install 670 * a new one. 671 * Note that if there is no reachable router in the list, 672 * the head entry will be used anyway. 673 * XXX: do we have to check the current routing table entry? 674 */ 675 bzero(&anydr, sizeof(anydr)); 676 defrouter_delreq(&anydr, 0); 677 defrouter_addreq(dr); 678 } 679 else { 680 /* 681 * The Default Router List is empty, so install the default 682 * route to an inteface. 683 * XXX: The specification does not say this mechanism should 684 * be restricted to hosts, but this would be not useful 685 * (even harmful) for routers. 686 */ 687 if (!ip6_forwarding) { 688 /* 689 * De-install the current default route 690 * in advance. 691 */ 692 bzero(&anydr, sizeof(anydr)); 693 defrouter_delreq(&anydr, 0); 694 if (nd6_defifp) { 695 /* 696 * Install a route to the default interface 697 * as default route. 698 * XXX: we enable this for host only, because 699 * this may override a default route installed 700 * a user process (e.g. routing daemon) in a 701 * router case. 702 */ 703 defrouter_addifreq(nd6_defifp); 704 } else { 705 nd6log((LOG_INFO, "defrouter_select: " 706 "there's no default router and no default" 707 " interface\n")); 708 } 709 } 710 } 711 712 crit_exit(); 713 return; 714 } 715 716 static struct nd_defrouter * 717 defrtrlist_update(struct nd_defrouter *new) 718 { 719 struct nd_defrouter *dr, *n; 720 721 crit_enter(); 722 723 if ((dr = defrouter_lookup(&new->rtaddr, new->ifp)) != NULL) { 724 /* entry exists */ 725 if (new->rtlifetime == 0) { 726 defrtrlist_del(dr); 727 dr = NULL; 728 } else { 729 /* override */ 730 dr->flags = new->flags; /* xxx flag check */ 731 dr->rtlifetime = new->rtlifetime; 732 dr->expire = new->expire; 733 } 734 crit_exit(); 735 return (dr); 736 } 737 738 /* entry does not exist */ 739 if (new->rtlifetime == 0) { 740 crit_exit(); 741 return (NULL); 742 } 743 744 n = (struct nd_defrouter *)kmalloc(sizeof(*n), M_IP6NDP, 745 M_NOWAIT | M_ZERO); 746 if (n == NULL) { 747 crit_exit(); 748 return (NULL); 749 } 750 *n = *new; 751 752 /* 753 * Insert the new router at the end of the Default Router List. 754 * If there is no other router, install it anyway. Otherwise, 755 * just continue to use the current default router. 756 */ 757 TAILQ_INSERT_TAIL(&nd_defrouter, n, dr_entry); 758 if (TAILQ_FIRST(&nd_defrouter) == n) 759 defrouter_select(); 760 crit_exit(); 761 return (n); 762 } 763 764 static struct nd_pfxrouter * 765 pfxrtr_lookup(struct nd_prefix *pr, struct nd_defrouter *dr) 766 { 767 struct nd_pfxrouter *search; 768 769 for (search = pr->ndpr_advrtrs.lh_first; search; search = search->pfr_next) { 770 if (search->router == dr) 771 break; 772 } 773 774 return (search); 775 } 776 777 static void 778 pfxrtr_add(struct nd_prefix *pr, struct nd_defrouter *dr) 779 { 780 struct nd_pfxrouter *new; 781 782 new = (struct nd_pfxrouter *)kmalloc(sizeof(*new), M_IP6NDP, 783 M_NOWAIT | M_ZERO); 784 if (new == NULL) 785 return; 786 new->router = dr; 787 788 LIST_INSERT_HEAD(&pr->ndpr_advrtrs, new, pfr_entry); 789 790 pfxlist_onlink_check(); 791 } 792 793 static void 794 pfxrtr_del(struct nd_pfxrouter *pfr) 795 { 796 LIST_REMOVE(pfr, pfr_entry); 797 kfree(pfr, M_IP6NDP); 798 } 799 800 struct nd_prefix * 801 nd6_prefix_lookup(struct nd_prefix *pr) 802 { 803 struct nd_prefix *search; 804 805 for (search = nd_prefix.lh_first; search; search = search->ndpr_next) { 806 if (pr->ndpr_ifp == search->ndpr_ifp && 807 pr->ndpr_plen == search->ndpr_plen && 808 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr, 809 &search->ndpr_prefix.sin6_addr, 810 pr->ndpr_plen) 811 ) { 812 break; 813 } 814 } 815 816 return (search); 817 } 818 819 int 820 nd6_prelist_add(struct nd_prefix *pr, struct nd_defrouter *dr, 821 struct nd_prefix **newp) 822 { 823 struct nd_prefix *new = NULL; 824 int i; 825 826 new = (struct nd_prefix *)kmalloc(sizeof(*new), M_IP6NDP, 827 M_NOWAIT | M_ZERO); 828 if (new == NULL) 829 return ENOMEM; 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 crit_enter(); 843 /* link ndpr_entry to nd_prefix list */ 844 LIST_INSERT_HEAD(&nd_prefix, new, ndpr_entry); 845 crit_exit(); 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(struct nd_prefix *pr) 869 { 870 struct nd_pfxrouter *pfr, *next; 871 int e; 872 873 /* make sure to invalidate the prefix until it is really freed. */ 874 pr->ndpr_vltime = 0; 875 pr->ndpr_pltime = 0; 876 #if 0 877 /* 878 * Though these flags are now meaningless, we'd rather keep the value 879 * not to confuse users when executing "ndp -p". 880 */ 881 pr->ndpr_raf_onlink = 0; 882 pr->ndpr_raf_auto = 0; 883 #endif 884 if ((pr->ndpr_stateflags & NDPRF_ONLINK) && 885 (e = nd6_prefix_offlink(pr)) != 0) { 886 nd6log((LOG_ERR, "prelist_remove: failed to make %s/%d offlink " 887 "on %s, errno=%d\n", 888 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 889 pr->ndpr_plen, if_name(pr->ndpr_ifp), e)); 890 /* what should we do? */ 891 } 892 893 if (pr->ndpr_refcnt > 0) 894 return; /* notice here? */ 895 896 crit_enter(); 897 898 /* unlink ndpr_entry from nd_prefix list */ 899 LIST_REMOVE(pr, ndpr_entry); 900 901 /* free list of routers that adversed the prefix */ 902 for (pfr = pr->ndpr_advrtrs.lh_first; pfr; pfr = next) { 903 next = pfr->pfr_next; 904 905 kfree(pfr, M_IP6NDP); 906 } 907 crit_exit(); 908 909 kfree(pr, M_IP6NDP); 910 911 pfxlist_onlink_check(); 912 } 913 914 /* 915 * Parameters: 916 * dr: may be NULL 917 */ 918 int 919 prelist_update(struct nd_prefix *new, struct nd_defrouter *dr, struct mbuf *m) 920 { 921 struct in6_ifaddr *ia6 = NULL, *ia6_match = NULL; 922 struct ifaddr_container *ifac; 923 struct ifnet *ifp = new->ndpr_ifp; 924 struct nd_prefix *pr; 925 int error = 0; 926 int newprefix = 0; 927 int auth; 928 struct in6_addrlifetime lt6_tmp; 929 930 auth = 0; 931 crit_enter(); 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)) { 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(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1048 struct ifaddr *ifa = ifac->ifa; 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) 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)) 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 if (lt6_tmp.ia6t_vltime == ND6_INFINITE_LIFETIME) 1089 storedlifetime = ND6_INFINITE_LIFETIME; 1090 else if (IFA6_IS_INVALID(ifa6)) 1091 storedlifetime = 0; 1092 else 1093 storedlifetime = lt6_tmp.ia6t_expire - time_second; 1094 1095 /* when not updating, keep the current stored lifetime. */ 1096 lt6_tmp.ia6t_vltime = storedlifetime; 1097 1098 if (TWOHOUR < new->ndpr_vltime || 1099 storedlifetime < new->ndpr_vltime) { 1100 lt6_tmp.ia6t_vltime = new->ndpr_vltime; 1101 } else if (storedlifetime <= TWOHOUR 1102 #if 0 1103 /* 1104 * This condition is logically redundant, so we just 1105 * omit it. 1106 * See IPng 6712, 6717, and 6721. 1107 */ 1108 && new->ndpr_vltime <= storedlifetime 1109 #endif 1110 ) { 1111 if (auth) { 1112 lt6_tmp.ia6t_vltime = new->ndpr_vltime; 1113 } 1114 } else { 1115 /* 1116 * new->ndpr_vltime <= TWOHOUR && 1117 * TWOHOUR < storedlifetime 1118 */ 1119 lt6_tmp.ia6t_vltime = TWOHOUR; 1120 } 1121 1122 /* The 2 hour rule is not imposed for preferred lifetime. */ 1123 lt6_tmp.ia6t_pltime = new->ndpr_pltime; 1124 1125 in6_init_address_ltimes(pr, <6_tmp); 1126 1127 /* 1128 * When adjusting the lifetimes of an existing temporary 1129 * address, only lower the lifetimes. 1130 * RFC 3041 3.3. (1). 1131 * XXX: how should we modify ia6t_[pv]ltime? 1132 */ 1133 if (ifa6->ia6_flags & IN6_IFF_TEMPORARY) { 1134 if (lt6_tmp.ia6t_expire == 0 || /* no expire */ 1135 lt6_tmp.ia6t_expire > 1136 ifa6->ia6_lifetime.ia6t_expire) { 1137 lt6_tmp.ia6t_expire = 1138 ifa6->ia6_lifetime.ia6t_expire; 1139 } 1140 if (lt6_tmp.ia6t_preferred == 0 || /* no expire */ 1141 lt6_tmp.ia6t_preferred > 1142 ifa6->ia6_lifetime.ia6t_preferred) { 1143 lt6_tmp.ia6t_preferred = 1144 ifa6->ia6_lifetime.ia6t_preferred; 1145 } 1146 } 1147 1148 ifa6->ia6_lifetime = lt6_tmp; 1149 } 1150 if (ia6_match == NULL && new->ndpr_vltime) { 1151 /* 1152 * No address matched and the valid lifetime is non-zero. 1153 * Create a new address. 1154 */ 1155 if ((ia6 = in6_ifadd(new, NULL)) != NULL) { 1156 /* 1157 * note that we should use pr (not new) for reference. 1158 */ 1159 pr->ndpr_refcnt++; 1160 ia6->ia6_ndpr = pr; 1161 1162 #if 0 1163 /* XXXYYY Don't do this, according to Jinmei. */ 1164 pr->ndpr_addr = new->ndpr_addr; 1165 #endif 1166 1167 /* 1168 * RFC 3041 3.3 (2). 1169 * When a new public address is created as described 1170 * in RFC2462, also create a new temporary address. 1171 * 1172 * RFC 3041 3.5. 1173 * When an interface connects to a new link, a new 1174 * randomized interface identifier should be generated 1175 * immediately together with a new set of temporary 1176 * addresses. Thus, we specifiy 1 as the 2nd arg of 1177 * in6_tmpifadd(). 1178 */ 1179 if (ip6_use_tempaddr) { 1180 int e; 1181 if ((e = in6_tmpifadd(ia6, 1)) != 0) { 1182 nd6log((LOG_NOTICE, "prelist_update: " 1183 "failed to create a temporary " 1184 "address, errno=%d\n", 1185 e)); 1186 } 1187 } 1188 1189 /* 1190 * A newly added address might affect the status 1191 * of other addresses, so we check and update it. 1192 * XXX: what if address duplication happens? 1193 */ 1194 pfxlist_onlink_check(); 1195 } else { 1196 /* just set an error. do not bark here. */ 1197 error = EADDRNOTAVAIL; /* XXX: might be unused. */ 1198 } 1199 } 1200 1201 afteraddrconf: 1202 1203 end: 1204 crit_exit(); 1205 return error; 1206 } 1207 1208 /* 1209 * A supplement function used in the on-link detection below; 1210 * detect if a given prefix has a (probably) reachable advertising router. 1211 * XXX: lengthy function name... 1212 */ 1213 static struct nd_pfxrouter * 1214 find_pfxlist_reachable_router(struct nd_prefix *pr) 1215 { 1216 struct nd_pfxrouter *pfxrtr; 1217 struct rtentry *rt; 1218 struct llinfo_nd6 *ln; 1219 1220 for (pfxrtr = LIST_FIRST(&pr->ndpr_advrtrs); pfxrtr; 1221 pfxrtr = LIST_NEXT(pfxrtr, pfr_entry)) { 1222 if ((rt = nd6_lookup(&pfxrtr->router->rtaddr, 0, 1223 pfxrtr->router->ifp)) && 1224 (ln = (struct llinfo_nd6 *)rt->rt_llinfo) && 1225 ND6_IS_LLINFO_PROBREACH(ln)) 1226 break; /* found */ 1227 } 1228 1229 return (pfxrtr); 1230 1231 } 1232 1233 /* 1234 * Check if each prefix in the prefix list has at least one available router 1235 * that advertised the prefix (a router is "available" if its neighbor cache 1236 * entry is reachable or probably reachable). 1237 * If the check fails, the prefix may be off-link, because, for example, 1238 * we have moved from the network but the lifetime of the prefix has not 1239 * expired yet. So we should not use the prefix if there is another prefix 1240 * that has an available router. 1241 * But, if there is no prefix that has an available router, we still regards 1242 * all the prefixes as on-link. This is because we can't tell if all the 1243 * routers are simply dead or if we really moved from the network and there 1244 * is no router around us. 1245 */ 1246 void 1247 pfxlist_onlink_check(void) 1248 { 1249 struct nd_prefix *pr; 1250 struct in6_ifaddr *ifa; 1251 1252 /* 1253 * Check if there is a prefix that has a reachable advertising 1254 * router. 1255 */ 1256 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 1257 if (pr->ndpr_raf_onlink && find_pfxlist_reachable_router(pr)) 1258 break; 1259 } 1260 1261 if (pr) { 1262 /* 1263 * There is at least one prefix that has a reachable router. 1264 * Detach prefixes which have no reachable advertising 1265 * router, and attach other prefixes. 1266 */ 1267 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 1268 /* XXX: a link-local prefix should never be detached */ 1269 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr)) 1270 continue; 1271 1272 /* 1273 * we aren't interested in prefixes without the L bit 1274 * set. 1275 */ 1276 if (pr->ndpr_raf_onlink == 0) 1277 continue; 1278 1279 if (!(pr->ndpr_stateflags & NDPRF_DETACHED) && 1280 find_pfxlist_reachable_router(pr) == NULL) 1281 pr->ndpr_stateflags |= NDPRF_DETACHED; 1282 if ((pr->ndpr_stateflags & NDPRF_DETACHED) && 1283 find_pfxlist_reachable_router(pr) != 0) 1284 pr->ndpr_stateflags &= ~NDPRF_DETACHED; 1285 } 1286 } else { 1287 /* there is no prefix that has a reachable router */ 1288 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 1289 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr)) 1290 continue; 1291 1292 if (pr->ndpr_raf_onlink == 0) 1293 continue; 1294 1295 if (pr->ndpr_stateflags & NDPRF_DETACHED) 1296 pr->ndpr_stateflags &= ~NDPRF_DETACHED; 1297 } 1298 } 1299 1300 /* 1301 * Remove each interface route associated with a (just) detached 1302 * prefix, and reinstall the interface route for a (just) attached 1303 * prefix. Note that all attempt of reinstallation does not 1304 * necessarily success, when a same prefix is shared among multiple 1305 * interfaces. Such cases will be handled in nd6_prefix_onlink, 1306 * so we don't have to care about them. 1307 */ 1308 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 1309 int e; 1310 1311 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr)) 1312 continue; 1313 1314 if (pr->ndpr_raf_onlink == 0) 1315 continue; 1316 1317 if ((pr->ndpr_stateflags & NDPRF_DETACHED) && 1318 (pr->ndpr_stateflags & NDPRF_ONLINK)) { 1319 if ((e = nd6_prefix_offlink(pr)) != 0) { 1320 nd6log((LOG_ERR, 1321 "pfxlist_onlink_check: failed to " 1322 "make %s/%d offlink, errno=%d\n", 1323 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 1324 pr->ndpr_plen, e)); 1325 } 1326 } 1327 if (!(pr->ndpr_stateflags & NDPRF_DETACHED) && 1328 !(pr->ndpr_stateflags & NDPRF_ONLINK) && 1329 pr->ndpr_raf_onlink) { 1330 if ((e = nd6_prefix_onlink(pr)) != 0) { 1331 nd6log((LOG_ERR, 1332 "pfxlist_onlink_check: failed to " 1333 "make %s/%d offlink, errno=%d\n", 1334 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 1335 pr->ndpr_plen, e)); 1336 } 1337 } 1338 } 1339 1340 /* 1341 * Changes on the prefix status might affect address status as well. 1342 * Make sure that all addresses derived from an attached prefix are 1343 * attached, and that all addresses derived from a detached prefix are 1344 * detached. Note, however, that a manually configured address should 1345 * always be attached. 1346 * The precise detection logic is same as the one for prefixes. 1347 */ 1348 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) { 1349 if (!(ifa->ia6_flags & IN6_IFF_AUTOCONF)) 1350 continue; 1351 1352 if (ifa->ia6_ndpr == NULL) { 1353 /* 1354 * This can happen when we first configure the address 1355 * (i.e. the address exists, but the prefix does not). 1356 * XXX: complicated relationships... 1357 */ 1358 continue; 1359 } 1360 1361 if (find_pfxlist_reachable_router(ifa->ia6_ndpr)) 1362 break; 1363 } 1364 if (ifa) { 1365 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) { 1366 if (!(ifa->ia6_flags & IN6_IFF_AUTOCONF)) 1367 continue; 1368 1369 if (ifa->ia6_ndpr == NULL) /* XXX: see above. */ 1370 continue; 1371 1372 if (find_pfxlist_reachable_router(ifa->ia6_ndpr)) 1373 ifa->ia6_flags &= ~IN6_IFF_DETACHED; 1374 else 1375 ifa->ia6_flags |= IN6_IFF_DETACHED; 1376 } 1377 } 1378 else { 1379 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) { 1380 if (!(ifa->ia6_flags & IN6_IFF_AUTOCONF)) 1381 continue; 1382 1383 ifa->ia6_flags &= ~IN6_IFF_DETACHED; 1384 } 1385 } 1386 } 1387 1388 int 1389 nd6_prefix_onlink(struct nd_prefix *pr) 1390 { 1391 struct ifaddr *ifa; 1392 struct ifnet *ifp = pr->ndpr_ifp; 1393 struct sockaddr_in6 mask6; 1394 struct nd_prefix *opr; 1395 u_long rtflags; 1396 int error = 0; 1397 struct rtentry *rt = NULL; 1398 1399 /* sanity check */ 1400 if (pr->ndpr_stateflags & NDPRF_ONLINK) { 1401 nd6log((LOG_ERR, 1402 "nd6_prefix_onlink: %s/%d is already on-link\n", 1403 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen); 1404 return (EEXIST)); 1405 } 1406 1407 /* 1408 * Add the interface route associated with the prefix. Before 1409 * installing the route, check if there's the same prefix on another 1410 * interface, and the prefix has already installed the interface route. 1411 * Although such a configuration is expected to be rare, we explicitly 1412 * allow it. 1413 */ 1414 for (opr = nd_prefix.lh_first; opr; opr = opr->ndpr_next) { 1415 if (opr == pr) 1416 continue; 1417 1418 if (!(opr->ndpr_stateflags & NDPRF_ONLINK)) 1419 continue; 1420 1421 if (opr->ndpr_plen == pr->ndpr_plen && 1422 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr, 1423 &opr->ndpr_prefix.sin6_addr, 1424 pr->ndpr_plen)) 1425 return (0); 1426 } 1427 1428 /* 1429 * We prefer link-local addresses as the associated interface address. 1430 */ 1431 /* search for a link-local addr */ 1432 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 1433 IN6_IFF_NOTREADY| 1434 IN6_IFF_ANYCAST); 1435 if (ifa == NULL) { 1436 struct ifaddr_container *ifac; 1437 1438 /* XXX: freebsd does not have ifa_ifwithaf */ 1439 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1440 if (ifac->ifa->ifa_addr->sa_family == AF_INET6) { 1441 ifa = ifac->ifa; 1442 break; 1443 } 1444 } 1445 /* should we care about ia6_flags? */ 1446 } 1447 if (ifa == NULL) { 1448 /* 1449 * This can still happen, when, for example, we receive an RA 1450 * containing a prefix with the L bit set and the A bit clear, 1451 * after removing all IPv6 addresses on the receiving 1452 * interface. This should, of course, be rare though. 1453 */ 1454 nd6log((LOG_NOTICE, 1455 "nd6_prefix_onlink: failed to find any ifaddr" 1456 " to add route for a prefix(%s/%d) on %s\n", 1457 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 1458 pr->ndpr_plen, if_name(ifp))); 1459 return (0); 1460 } 1461 1462 /* 1463 * in6_ifinit() sets nd6_rtrequest to ifa_rtrequest for all ifaddrs. 1464 * ifa->ifa_rtrequest = nd6_rtrequest; 1465 */ 1466 bzero(&mask6, sizeof(mask6)); 1467 mask6.sin6_len = sizeof(mask6); 1468 mask6.sin6_addr = pr->ndpr_mask; 1469 rtflags = ifa->ifa_flags | RTF_CLONING | RTF_UP; 1470 if (nd6_need_cache(ifp)) { 1471 /* explicitly set in case ifa_flags does not set the flag. */ 1472 rtflags |= RTF_CLONING; 1473 } else { 1474 /* 1475 * explicitly clear the cloning bit in case ifa_flags sets it. 1476 */ 1477 rtflags &= ~RTF_CLONING; 1478 } 1479 error = rtrequest(RTM_ADD, (struct sockaddr *)&pr->ndpr_prefix, 1480 ifa->ifa_addr, (struct sockaddr *)&mask6, 1481 rtflags, &rt); 1482 if (error == 0) { 1483 if (rt != NULL) /* this should be non NULL, though */ 1484 nd6_rtmsg(RTM_ADD, rt); 1485 pr->ndpr_stateflags |= NDPRF_ONLINK; 1486 } 1487 else { 1488 nd6log((LOG_ERR, "nd6_prefix_onlink: failed to add route for a" 1489 " prefix (%s/%d) on %s, gw=%s, mask=%s, flags=%lx " 1490 "errno = %d\n", 1491 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 1492 pr->ndpr_plen, if_name(ifp), 1493 ip6_sprintf(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr), 1494 ip6_sprintf(&mask6.sin6_addr), rtflags, error)); 1495 } 1496 1497 if (rt != NULL) 1498 rt->rt_refcnt--; 1499 1500 return (error); 1501 } 1502 1503 int 1504 nd6_prefix_offlink(struct nd_prefix *pr) 1505 { 1506 int error = 0; 1507 struct ifnet *ifp = pr->ndpr_ifp; 1508 struct nd_prefix *opr; 1509 struct sockaddr_in6 sa6, mask6; 1510 struct rtentry *rt = NULL; 1511 1512 /* sanity check */ 1513 if (!(pr->ndpr_stateflags & NDPRF_ONLINK)) { 1514 nd6log((LOG_ERR, 1515 "nd6_prefix_offlink: %s/%d is already off-link\n", 1516 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen)); 1517 return (EEXIST); 1518 } 1519 1520 bzero(&sa6, sizeof(sa6)); 1521 sa6.sin6_family = AF_INET6; 1522 sa6.sin6_len = sizeof(sa6); 1523 bcopy(&pr->ndpr_prefix.sin6_addr, &sa6.sin6_addr, 1524 sizeof(struct in6_addr)); 1525 bzero(&mask6, sizeof(mask6)); 1526 mask6.sin6_family = AF_INET6; 1527 mask6.sin6_len = sizeof(sa6); 1528 bcopy(&pr->ndpr_mask, &mask6.sin6_addr, sizeof(struct in6_addr)); 1529 error = rtrequest(RTM_DELETE, (struct sockaddr *)&sa6, NULL, 1530 (struct sockaddr *)&mask6, 0, &rt); 1531 if (error == 0) { 1532 pr->ndpr_stateflags &= ~NDPRF_ONLINK; 1533 1534 /* report the route deletion to the routing socket. */ 1535 if (rt != NULL) 1536 nd6_rtmsg(RTM_DELETE, rt); 1537 1538 /* 1539 * There might be the same prefix on another interface, 1540 * the prefix which could not be on-link just because we have 1541 * the interface route (see comments in nd6_prefix_onlink). 1542 * If there's one, try to make the prefix on-link on the 1543 * interface. 1544 */ 1545 for (opr = nd_prefix.lh_first; opr; opr = opr->ndpr_next) { 1546 if (opr == pr) 1547 continue; 1548 1549 if (opr->ndpr_stateflags & NDPRF_ONLINK) 1550 continue; 1551 1552 /* 1553 * KAME specific: detached prefixes should not be 1554 * on-link. 1555 */ 1556 if (opr->ndpr_stateflags & NDPRF_DETACHED) 1557 continue; 1558 1559 if (opr->ndpr_plen == pr->ndpr_plen && 1560 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr, 1561 &opr->ndpr_prefix.sin6_addr, 1562 pr->ndpr_plen)) { 1563 int e; 1564 1565 if ((e = nd6_prefix_onlink(opr)) != 0) { 1566 nd6log((LOG_ERR, 1567 "nd6_prefix_offlink: failed to " 1568 "recover a prefix %s/%d from %s " 1569 "to %s (errno = %d)\n", 1570 ip6_sprintf(&opr->ndpr_prefix.sin6_addr), 1571 opr->ndpr_plen, if_name(ifp), 1572 if_name(opr->ndpr_ifp), e)); 1573 } 1574 } 1575 } 1576 } 1577 else { 1578 /* XXX: can we still set the NDPRF_ONLINK flag? */ 1579 nd6log((LOG_ERR, 1580 "nd6_prefix_offlink: failed to delete route: " 1581 "%s/%d on %s (errno = %d)\n", 1582 ip6_sprintf(&sa6.sin6_addr), pr->ndpr_plen, if_name(ifp), 1583 error)); 1584 } 1585 1586 if (rt != NULL) { 1587 if (rt->rt_refcnt <= 0) { 1588 /* XXX: we should free the entry ourselves. */ 1589 rt->rt_refcnt++; 1590 rtfree(rt); 1591 } 1592 } 1593 1594 return (error); 1595 } 1596 1597 /* 1598 * Parameters: 1599 * ifid: Mobile IPv6 addition 1600 */ 1601 static struct in6_ifaddr * 1602 in6_ifadd(struct nd_prefix *pr, struct in6_addr *ifid) 1603 { 1604 struct ifnet *ifp = pr->ndpr_ifp; 1605 struct ifaddr *ifa; 1606 struct in6_aliasreq ifra; 1607 struct in6_ifaddr *ia, *ib; 1608 int error, plen0; 1609 struct in6_addr mask; 1610 int prefixlen = pr->ndpr_plen; 1611 1612 in6_len2mask(&mask, prefixlen); 1613 1614 /* 1615 * find a link-local address (will be interface ID). 1616 * Is it really mandatory? Theoretically, a global or a site-local 1617 * address can be configured without a link-local address, if we 1618 * have a unique interface identifier... 1619 * 1620 * it is not mandatory to have a link-local address, we can generate 1621 * interface identifier on the fly. we do this because: 1622 * (1) it should be the easiest way to find interface identifier. 1623 * (2) RFC2462 5.4 suggesting the use of the same interface identifier 1624 * for multiple addresses on a single interface, and possible shortcut 1625 * of DAD. we omitted DAD for this reason in the past. 1626 * (3) a user can prevent autoconfiguration of global address 1627 * by removing link-local address by hand (this is partly because we 1628 * don't have other way to control the use of IPv6 on a interface. 1629 * this has been our design choice - cf. NRL's "ifconfig auto"). 1630 * (4) it is easier to manage when an interface has addresses 1631 * with the same interface identifier, than to have multiple addresses 1632 * with different interface identifiers. 1633 * 1634 * Mobile IPv6 addition: allow for caller to specify a wished interface 1635 * ID. This is to not break connections when moving addresses between 1636 * interfaces. 1637 */ 1638 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0);/* 0 is OK? */ 1639 if (ifa) 1640 ib = (struct in6_ifaddr *)ifa; 1641 else 1642 return NULL; 1643 1644 #if 0 /* don't care link local addr state, and always do DAD */ 1645 /* if link-local address is not eligible, do not autoconfigure. */ 1646 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) { 1647 kprintf("in6_ifadd: link-local address not ready\n"); 1648 return NULL; 1649 } 1650 #endif 1651 1652 /* prefixlen + ifidlen must be equal to 128 */ 1653 plen0 = in6_mask2len(&ib->ia_prefixmask.sin6_addr, NULL); 1654 if (prefixlen != plen0) { 1655 nd6log((LOG_INFO, "in6_ifadd: wrong prefixlen for %s " 1656 "(prefix=%d ifid=%d)\n", 1657 if_name(ifp), prefixlen, 128 - plen0)); 1658 return NULL; 1659 } 1660 1661 /* make ifaddr */ 1662 1663 bzero(&ifra, sizeof(ifra)); 1664 /* 1665 * in6_update_ifa() does not use ifra_name, but we accurately set it 1666 * for safety. 1667 */ 1668 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 1669 ifra.ifra_addr.sin6_family = AF_INET6; 1670 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 1671 /* prefix */ 1672 bcopy(&pr->ndpr_prefix.sin6_addr, &ifra.ifra_addr.sin6_addr, 1673 sizeof(ifra.ifra_addr.sin6_addr)); 1674 ifra.ifra_addr.sin6_addr.s6_addr32[0] &= mask.s6_addr32[0]; 1675 ifra.ifra_addr.sin6_addr.s6_addr32[1] &= mask.s6_addr32[1]; 1676 ifra.ifra_addr.sin6_addr.s6_addr32[2] &= mask.s6_addr32[2]; 1677 ifra.ifra_addr.sin6_addr.s6_addr32[3] &= mask.s6_addr32[3]; 1678 1679 /* interface ID */ 1680 if (ifid == NULL || IN6_IS_ADDR_UNSPECIFIED(ifid)) 1681 ifid = &ib->ia_addr.sin6_addr; 1682 ifra.ifra_addr.sin6_addr.s6_addr32[0] 1683 |= (ifid->s6_addr32[0] & ~mask.s6_addr32[0]); 1684 ifra.ifra_addr.sin6_addr.s6_addr32[1] 1685 |= (ifid->s6_addr32[1] & ~mask.s6_addr32[1]); 1686 ifra.ifra_addr.sin6_addr.s6_addr32[2] 1687 |= (ifid->s6_addr32[2] & ~mask.s6_addr32[2]); 1688 ifra.ifra_addr.sin6_addr.s6_addr32[3] 1689 |= (ifid->s6_addr32[3] & ~mask.s6_addr32[3]); 1690 1691 /* new prefix mask. */ 1692 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 1693 ifra.ifra_prefixmask.sin6_family = AF_INET6; 1694 bcopy(&mask, &ifra.ifra_prefixmask.sin6_addr, 1695 sizeof(ifra.ifra_prefixmask.sin6_addr)); 1696 1697 /* 1698 * lifetime. 1699 * XXX: in6_init_address_ltimes would override these values later. 1700 * We should reconsider this logic. 1701 */ 1702 ifra.ifra_lifetime.ia6t_vltime = pr->ndpr_vltime; 1703 ifra.ifra_lifetime.ia6t_pltime = pr->ndpr_pltime; 1704 1705 /* XXX: scope zone ID? */ 1706 1707 ifra.ifra_flags |= IN6_IFF_AUTOCONF; /* obey autoconf */ 1708 /* 1709 * temporarily set the nopfx flag to avoid conflict. 1710 * XXX: we should reconsider the entire mechanism about prefix 1711 * manipulation. 1712 */ 1713 ifra.ifra_flags |= IN6_IFF_NOPFX; 1714 1715 /* 1716 * keep the new address, regardless of the result of in6_update_ifa. 1717 * XXX: this address is now meaningless. 1718 * We should reconsider its role. 1719 */ 1720 pr->ndpr_addr = ifra.ifra_addr.sin6_addr; 1721 1722 /* allocate ifaddr structure, link into chain, etc. */ 1723 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) { 1724 nd6log((LOG_ERR, 1725 "in6_ifadd: failed to make ifaddr %s on %s (errno=%d)\n", 1726 ip6_sprintf(&ifra.ifra_addr.sin6_addr), if_name(ifp), 1727 error)); 1728 return (NULL); /* ifaddr must not have been allocated. */ 1729 } 1730 1731 ia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr); 1732 1733 return (ia); /* this must NOT be NULL. */ 1734 } 1735 1736 /* 1737 * Parameters: 1738 * ia0: corresponding public address 1739 */ 1740 int 1741 in6_tmpifadd(const struct in6_ifaddr *ia0, int forcegen) 1742 { 1743 struct ifnet *ifp = ia0->ia_ifa.ifa_ifp; 1744 struct in6_ifaddr *newia; 1745 struct in6_aliasreq ifra; 1746 int i, error; 1747 int trylimit = 3; /* XXX: adhoc value */ 1748 u_int32_t randid[2]; 1749 time_t vltime0, pltime0; 1750 1751 bzero(&ifra, sizeof(ifra)); 1752 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 1753 ifra.ifra_addr = ia0->ia_addr; 1754 /* copy prefix mask */ 1755 ifra.ifra_prefixmask = ia0->ia_prefixmask; 1756 /* clear the old IFID */ 1757 for (i = 0; i < 4; i++) { 1758 ifra.ifra_addr.sin6_addr.s6_addr32[i] 1759 &= ifra.ifra_prefixmask.sin6_addr.s6_addr32[i]; 1760 } 1761 1762 again: 1763 in6_get_tmpifid(ifp, (u_int8_t *)randid, 1764 (const u_int8_t *)&ia0->ia_addr.sin6_addr.s6_addr[8], 1765 forcegen); 1766 ifra.ifra_addr.sin6_addr.s6_addr32[2] 1767 |= (randid[0] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[2])); 1768 ifra.ifra_addr.sin6_addr.s6_addr32[3] 1769 |= (randid[1] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[3])); 1770 1771 /* 1772 * If by chance the new temporary address is the same as an address 1773 * already assigned to the interface, generate a new randomized 1774 * interface identifier and repeat this step. 1775 * RFC 3041 3.3 (4). 1776 */ 1777 if (in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr) != NULL) { 1778 if (trylimit-- == 0) { 1779 nd6log((LOG_NOTICE, "in6_tmpifadd: failed to find " 1780 "a unique random IFID\n")); 1781 return (EEXIST); 1782 } 1783 forcegen = 1; 1784 goto again; 1785 } 1786 1787 /* 1788 * The Valid Lifetime is the lower of the Valid Lifetime of the 1789 * public address or TEMP_VALID_LIFETIME. 1790 * The Preferred Lifetime is the lower of the Preferred Lifetime 1791 * of the public address or TEMP_PREFERRED_LIFETIME - 1792 * DESYNC_FACTOR. 1793 */ 1794 if (ia0->ia6_lifetime.ia6t_expire != 0) { 1795 vltime0 = IFA6_IS_INVALID(ia0) ? 0 : 1796 (ia0->ia6_lifetime.ia6t_expire - time_second); 1797 if (vltime0 > ip6_temp_valid_lifetime) 1798 vltime0 = ip6_temp_valid_lifetime; 1799 } else 1800 vltime0 = ip6_temp_valid_lifetime; 1801 if (ia0->ia6_lifetime.ia6t_preferred != 0) { 1802 pltime0 = IFA6_IS_DEPRECATED(ia0) ? 0 : 1803 (ia0->ia6_lifetime.ia6t_preferred - time_second); 1804 if (pltime0 > ip6_temp_preferred_lifetime - ip6_desync_factor) { 1805 pltime0 = ip6_temp_preferred_lifetime - 1806 ip6_desync_factor; 1807 } 1808 } else 1809 pltime0 = ip6_temp_preferred_lifetime - ip6_desync_factor; 1810 ifra.ifra_lifetime.ia6t_vltime = vltime0; 1811 ifra.ifra_lifetime.ia6t_pltime = pltime0; 1812 1813 /* 1814 * A temporary address is created only if this calculated Preferred 1815 * Lifetime is greater than REGEN_ADVANCE time units. 1816 */ 1817 if (ifra.ifra_lifetime.ia6t_pltime <= ip6_temp_regen_advance) 1818 return (0); 1819 1820 /* XXX: scope zone ID? */ 1821 1822 ifra.ifra_flags |= (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY); 1823 1824 /* allocate ifaddr structure, link into chain, etc. */ 1825 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) 1826 return (error); 1827 1828 newia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr); 1829 if (newia == NULL) { /* XXX: can it happen? */ 1830 nd6log((LOG_ERR, 1831 "in6_tmpifadd: ifa update succeeded, but we got " 1832 "no ifaddr\n")); 1833 return (EINVAL); /* XXX */ 1834 } 1835 newia->ia6_ndpr = ia0->ia6_ndpr; 1836 newia->ia6_ndpr->ndpr_refcnt++; 1837 1838 return (0); 1839 } 1840 1841 int 1842 in6_init_prefix_ltimes(struct nd_prefix *ndpr) 1843 { 1844 /* check if preferred lifetime > valid lifetime. RFC2462 5.5.3 (c) */ 1845 if (ndpr->ndpr_pltime > ndpr->ndpr_vltime) { 1846 nd6log((LOG_INFO, "in6_init_prefix_ltimes: preferred lifetime" 1847 "(%d) is greater than valid lifetime(%d)\n", 1848 (u_int)ndpr->ndpr_pltime, (u_int)ndpr->ndpr_vltime)); 1849 return (EINVAL); 1850 } 1851 if (ndpr->ndpr_pltime == ND6_INFINITE_LIFETIME) 1852 ndpr->ndpr_preferred = 0; 1853 else 1854 ndpr->ndpr_preferred = time_second + ndpr->ndpr_pltime; 1855 if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME) 1856 ndpr->ndpr_expire = 0; 1857 else 1858 ndpr->ndpr_expire = time_second + ndpr->ndpr_vltime; 1859 1860 return 0; 1861 } 1862 1863 static void 1864 in6_init_address_ltimes(struct nd_prefix *new, struct in6_addrlifetime *lt6) 1865 { 1866 /* init ia6t_expire */ 1867 if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME) 1868 lt6->ia6t_expire = 0; 1869 else { 1870 lt6->ia6t_expire = time_second; 1871 lt6->ia6t_expire += lt6->ia6t_vltime; 1872 } 1873 1874 /* init ia6t_preferred */ 1875 if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME) 1876 lt6->ia6t_preferred = 0; 1877 else { 1878 lt6->ia6t_preferred = time_second; 1879 lt6->ia6t_preferred += lt6->ia6t_pltime; 1880 } 1881 } 1882 1883 /* 1884 * Delete all the routing table entries that use the specified gateway. 1885 * XXX: this function causes search through all entries of routing table, so 1886 * it shouldn't be called when acting as a router. 1887 */ 1888 void 1889 rt6_flush(struct in6_addr *gateway, struct ifnet *ifp) 1890 { 1891 struct radix_node_head *rnh = rt_tables[mycpuid][AF_INET6]; 1892 1893 crit_enter(); 1894 1895 /* We'll care only link-local addresses */ 1896 if (!IN6_IS_ADDR_LINKLOCAL(gateway)) { 1897 crit_exit(); 1898 return; 1899 } 1900 /* XXX: hack for KAME's link-local address kludge */ 1901 gateway->s6_addr16[1] = htons(ifp->if_index); 1902 1903 rnh->rnh_walktree(rnh, rt6_deleteroute, (void *)gateway); 1904 crit_exit(); 1905 } 1906 1907 static int 1908 rt6_deleteroute(struct radix_node *rn, 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) 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)) 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(int ifindex) 1942 { 1943 int error = 0; 1944 1945 if (ifindex < 0 || if_index < ifindex) 1946 return (EINVAL); 1947 1948 if (nd6_defifindex != ifindex) { 1949 nd6_defifindex = ifindex; 1950 if (nd6_defifindex > 0) 1951 nd6_defifp = ifindex2ifnet[nd6_defifindex]; 1952 else 1953 nd6_defifp = NULL; 1954 1955 /* 1956 * If the Default Router List is empty, install a route 1957 * to the specified interface as default or remove the default 1958 * route when the default interface becomes canceled. 1959 * The check for the queue is actually redundant, but 1960 * we do this here to avoid re-install the default route 1961 * if the list is NOT empty. 1962 */ 1963 if (TAILQ_FIRST(&nd_defrouter) == NULL) 1964 defrouter_select(); 1965 1966 /* 1967 * Our current implementation assumes one-to-one maping between 1968 * interfaces and links, so it would be natural to use the 1969 * default interface as the default link. 1970 */ 1971 scope6_setdefault(nd6_defifp); 1972 } 1973 1974 return (error); 1975 } 1976