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sys/netinet6/nd6_rtr.c
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1 /* $FreeBSD: releng/5.0/sys/netinet6/nd6_rtr.c 95023 2002-04-19 04:46:24Z suz $ */ 2 /* $KAME: nd6_rtr.c,v 1.111 2001/04/27 01:37:15 jinmei Exp $ */ 3 4 /* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #include "opt_inet.h" 34 #include "opt_inet6.h" 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/malloc.h> 39 #include <sys/mbuf.h> 40 #include <sys/socket.h> 41 #include <sys/sockio.h> 42 #include <sys/time.h> 43 #include <sys/kernel.h> 44 #include <sys/errno.h> 45 #include <sys/syslog.h> 46 #include <sys/queue.h> 47 48 #include <net/if.h> 49 #include <net/if_types.h> 50 #include <net/if_dl.h> 51 #include <net/route.h> 52 #include <net/radix.h> 53 54 #include <netinet/in.h> 55 #include <netinet6/in6_var.h> 56 #include <netinet6/in6_ifattach.h> 57 #include <netinet/ip6.h> 58 #include <netinet6/ip6_var.h> 59 #include <netinet6/nd6.h> 60 #include <netinet/icmp6.h> 61 #include <netinet6/scope6_var.h> 62 63 #include <net/net_osdep.h> 64 65 #define SDL(s) ((struct sockaddr_dl *)s) 66 67 static struct nd_defrouter *defrtrlist_update __P((struct nd_defrouter *)); 68 static struct in6_ifaddr *in6_ifadd __P((struct nd_prefix *, 69 struct in6_addr *)); 70 static struct nd_pfxrouter *pfxrtr_lookup __P((struct nd_prefix *, 71 struct nd_defrouter *)); 72 static void pfxrtr_add __P((struct nd_prefix *, struct nd_defrouter *)); 73 static void pfxrtr_del __P((struct nd_pfxrouter *)); 74 static struct nd_pfxrouter *find_pfxlist_reachable_router 75 __P((struct nd_prefix *)); 76 static void defrouter_addifreq __P((struct ifnet *)); 77 static void nd6_rtmsg __P((int, struct rtentry *)); 78 79 static void in6_init_address_ltimes __P((struct nd_prefix *ndpr, 80 struct in6_addrlifetime *lt6)); 81 82 static int rt6_deleteroute __P((struct radix_node *, void *)); 83 84 extern int nd6_recalc_reachtm_interval; 85 86 static struct ifnet *nd6_defifp; 87 int nd6_defifindex; 88 89 int ip6_use_tempaddr = 0; 90 91 int ip6_desync_factor; 92 u_int32_t ip6_temp_preferred_lifetime = DEF_TEMP_PREFERRED_LIFETIME; 93 u_int32_t ip6_temp_valid_lifetime = DEF_TEMP_VALID_LIFETIME; 94 /* 95 * shorter lifetimes for debugging purposes. 96 int ip6_temp_preferred_lifetime = 800; 97 static int ip6_temp_valid_lifetime = 1800; 98 */ 99 int ip6_temp_regen_advance = TEMPADDR_REGEN_ADVANCE; 100 101 /* 102 * Receive Router Solicitation Message - just for routers. 103 * Router solicitation/advertisement is mostly managed by userland program 104 * (rtadvd) so here we have no function like nd6_ra_output(). 105 * 106 * Based on RFC 2461 107 */ 108 void 109 nd6_rs_input(m, off, icmp6len) 110 struct mbuf *m; 111 int off, icmp6len; 112 { 113 struct ifnet *ifp = m->m_pkthdr.rcvif; 114 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 115 struct nd_router_solicit *nd_rs; 116 struct in6_addr saddr6 = ip6->ip6_src; 117 #if 0 118 struct in6_addr daddr6 = ip6->ip6_dst; 119 #endif 120 char *lladdr = NULL; 121 int lladdrlen = 0; 122 #if 0 123 struct sockaddr_dl *sdl = (struct sockaddr_dl *)NULL; 124 struct llinfo_nd6 *ln = (struct llinfo_nd6 *)NULL; 125 struct rtentry *rt = NULL; 126 int is_newentry; 127 #endif 128 union nd_opts ndopts; 129 130 /* If I'm not a router, ignore it. */ 131 if (ip6_accept_rtadv != 0 || ip6_forwarding != 1) 132 goto freeit; 133 134 /* Sanity checks */ 135 if (ip6->ip6_hlim != 255) { 136 nd6log((LOG_ERR, 137 "nd6_rs_input: invalid hlim (%d) from %s to %s on %s\n", 138 ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src), 139 ip6_sprintf(&ip6->ip6_dst), if_name(ifp))); 140 goto bad; 141 } 142 143 /* 144 * Don't update the neighbor cache, if src = ::. 145 * This indicates that the src has no IP address assigned yet. 146 */ 147 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) 148 goto freeit; 149 150 #ifndef PULLDOWN_TEST 151 IP6_EXTHDR_CHECK(m, off, icmp6len,); 152 nd_rs = (struct nd_router_solicit *)((caddr_t)ip6 + off); 153 #else 154 IP6_EXTHDR_GET(nd_rs, struct nd_router_solicit *, m, off, icmp6len); 155 if (nd_rs == NULL) { 156 icmp6stat.icp6s_tooshort++; 157 return; 158 } 159 #endif 160 161 icmp6len -= sizeof(*nd_rs); 162 nd6_option_init(nd_rs + 1, icmp6len, &ndopts); 163 if (nd6_options(&ndopts) < 0) { 164 nd6log((LOG_INFO, 165 "nd6_rs_input: invalid ND option, ignored\n")); 166 /* nd6_options have incremented stats */ 167 goto freeit; 168 } 169 170 if (ndopts.nd_opts_src_lladdr) { 171 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1); 172 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3; 173 } 174 175 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 176 nd6log((LOG_INFO, 177 "nd6_rs_input: lladdrlen mismatch for %s " 178 "(if %d, RS packet %d)\n", 179 ip6_sprintf(&saddr6), ifp->if_addrlen, lladdrlen - 2)); 180 goto bad; 181 } 182 183 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_SOLICIT, 0); 184 185 freeit: 186 m_freem(m); 187 return; 188 189 bad: 190 icmp6stat.icp6s_badrs++; 191 m_freem(m); 192 } 193 194 /* 195 * Receive Router Advertisement Message. 196 * 197 * Based on RFC 2461 198 * TODO: on-link bit on prefix information 199 * TODO: ND_RA_FLAG_{OTHER,MANAGED} processing 200 */ 201 void 202 nd6_ra_input(m, off, icmp6len) 203 struct mbuf *m; 204 int off, icmp6len; 205 { 206 struct ifnet *ifp = m->m_pkthdr.rcvif; 207 struct nd_ifinfo *ndi = &nd_ifinfo[ifp->if_index]; 208 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 209 struct nd_router_advert *nd_ra; 210 struct in6_addr saddr6 = ip6->ip6_src; 211 #if 0 212 struct in6_addr daddr6 = ip6->ip6_dst; 213 int flags; /* = nd_ra->nd_ra_flags_reserved; */ 214 int is_managed = ((flags & ND_RA_FLAG_MANAGED) != 0); 215 int is_other = ((flags & ND_RA_FLAG_OTHER) != 0); 216 #endif 217 union nd_opts ndopts; 218 struct nd_defrouter *dr; 219 220 if (ip6_accept_rtadv == 0) 221 goto freeit; 222 223 if (ip6->ip6_hlim != 255) { 224 nd6log((LOG_ERR, 225 "nd6_ra_input: invalid hlim (%d) from %s to %s on %s\n", 226 ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src), 227 ip6_sprintf(&ip6->ip6_dst), if_name(ifp))); 228 goto bad; 229 } 230 231 if (!IN6_IS_ADDR_LINKLOCAL(&saddr6)) { 232 nd6log((LOG_ERR, 233 "nd6_ra_input: src %s is not link-local\n", 234 ip6_sprintf(&saddr6))); 235 goto bad; 236 } 237 238 #ifndef PULLDOWN_TEST 239 IP6_EXTHDR_CHECK(m, off, icmp6len,); 240 nd_ra = (struct nd_router_advert *)((caddr_t)ip6 + off); 241 #else 242 IP6_EXTHDR_GET(nd_ra, struct nd_router_advert *, m, off, icmp6len); 243 if (nd_ra == NULL) { 244 icmp6stat.icp6s_tooshort++; 245 return; 246 } 247 #endif 248 249 icmp6len -= sizeof(*nd_ra); 250 nd6_option_init(nd_ra + 1, icmp6len, &ndopts); 251 if (nd6_options(&ndopts) < 0) { 252 nd6log((LOG_INFO, 253 "nd6_ra_input: invalid ND option, ignored\n")); 254 /* nd6_options have incremented stats */ 255 goto freeit; 256 } 257 258 { 259 struct nd_defrouter dr0; 260 u_int32_t advreachable = nd_ra->nd_ra_reachable; 261 262 dr0.rtaddr = saddr6; 263 dr0.flags = nd_ra->nd_ra_flags_reserved; 264 dr0.rtlifetime = ntohs(nd_ra->nd_ra_router_lifetime); 265 dr0.expire = time_second + dr0.rtlifetime; 266 dr0.ifp = ifp; 267 dr0.advint = 0; /* Mobile IPv6 */ 268 dr0.advint_expire = 0; /* Mobile IPv6 */ 269 dr0.advints_lost = 0; /* Mobile IPv6 */ 270 /* unspecified or not? (RFC 2461 6.3.4) */ 271 if (advreachable) { 272 advreachable = ntohl(advreachable); 273 if (advreachable <= MAX_REACHABLE_TIME && 274 ndi->basereachable != advreachable) { 275 ndi->basereachable = advreachable; 276 ndi->reachable = ND_COMPUTE_RTIME(ndi->basereachable); 277 ndi->recalctm = nd6_recalc_reachtm_interval; /* reset */ 278 } 279 } 280 if (nd_ra->nd_ra_retransmit) 281 ndi->retrans = ntohl(nd_ra->nd_ra_retransmit); 282 if (nd_ra->nd_ra_curhoplimit) 283 ndi->chlim = nd_ra->nd_ra_curhoplimit; 284 dr = defrtrlist_update(&dr0); 285 } 286 287 /* 288 * prefix 289 */ 290 if (ndopts.nd_opts_pi) { 291 struct nd_opt_hdr *pt; 292 struct nd_opt_prefix_info *pi = NULL; 293 struct nd_prefix pr; 294 295 for (pt = (struct nd_opt_hdr *)ndopts.nd_opts_pi; 296 pt <= (struct nd_opt_hdr *)ndopts.nd_opts_pi_end; 297 pt = (struct nd_opt_hdr *)((caddr_t)pt + 298 (pt->nd_opt_len << 3))) { 299 if (pt->nd_opt_type != ND_OPT_PREFIX_INFORMATION) 300 continue; 301 pi = (struct nd_opt_prefix_info *)pt; 302 303 if (pi->nd_opt_pi_len != 4) { 304 nd6log((LOG_INFO, 305 "nd6_ra_input: invalid option " 306 "len %d for prefix information option, " 307 "ignored\n", pi->nd_opt_pi_len)); 308 continue; 309 } 310 311 if (128 < pi->nd_opt_pi_prefix_len) { 312 nd6log((LOG_INFO, 313 "nd6_ra_input: invalid prefix " 314 "len %d for prefix information option, " 315 "ignored\n", pi->nd_opt_pi_prefix_len)); 316 continue; 317 } 318 319 if (IN6_IS_ADDR_MULTICAST(&pi->nd_opt_pi_prefix) 320 || IN6_IS_ADDR_LINKLOCAL(&pi->nd_opt_pi_prefix)) { 321 nd6log((LOG_INFO, 322 "nd6_ra_input: invalid prefix " 323 "%s, ignored\n", 324 ip6_sprintf(&pi->nd_opt_pi_prefix))); 325 continue; 326 } 327 328 /* aggregatable unicast address, rfc2374 */ 329 if ((pi->nd_opt_pi_prefix.s6_addr8[0] & 0xe0) == 0x20 330 && pi->nd_opt_pi_prefix_len != 64) { 331 nd6log((LOG_INFO, 332 "nd6_ra_input: invalid prefixlen " 333 "%d for rfc2374 prefix %s, ignored\n", 334 pi->nd_opt_pi_prefix_len, 335 ip6_sprintf(&pi->nd_opt_pi_prefix))); 336 continue; 337 } 338 339 bzero(&pr, sizeof(pr)); 340 pr.ndpr_prefix.sin6_family = AF_INET6; 341 pr.ndpr_prefix.sin6_len = sizeof(pr.ndpr_prefix); 342 pr.ndpr_prefix.sin6_addr = pi->nd_opt_pi_prefix; 343 pr.ndpr_ifp = (struct ifnet *)m->m_pkthdr.rcvif; 344 345 pr.ndpr_raf_onlink = (pi->nd_opt_pi_flags_reserved & 346 ND_OPT_PI_FLAG_ONLINK) ? 1 : 0; 347 pr.ndpr_raf_auto = (pi->nd_opt_pi_flags_reserved & 348 ND_OPT_PI_FLAG_AUTO) ? 1 : 0; 349 pr.ndpr_plen = pi->nd_opt_pi_prefix_len; 350 pr.ndpr_vltime = ntohl(pi->nd_opt_pi_valid_time); 351 pr.ndpr_pltime = 352 ntohl(pi->nd_opt_pi_preferred_time); 353 354 if (in6_init_prefix_ltimes(&pr)) 355 continue; /* prefix lifetime init failed */ 356 357 (void)prelist_update(&pr, dr, m); 358 } 359 } 360 361 /* 362 * MTU 363 */ 364 if (ndopts.nd_opts_mtu && ndopts.nd_opts_mtu->nd_opt_mtu_len == 1) { 365 u_int32_t mtu = ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu); 366 367 /* lower bound */ 368 if (mtu < IPV6_MMTU) { 369 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu option " 370 "mtu=%d sent from %s, ignoring\n", 371 mtu, ip6_sprintf(&ip6->ip6_src))); 372 goto skip; 373 } 374 375 /* upper bound */ 376 if (ndi->maxmtu) { 377 if (mtu <= ndi->maxmtu) { 378 int change = (ndi->linkmtu != mtu); 379 380 ndi->linkmtu = mtu; 381 if (change) /* in6_maxmtu may change */ 382 in6_setmaxmtu(); 383 } else { 384 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu " 385 "mtu=%d sent from %s; " 386 "exceeds maxmtu %d, ignoring\n", 387 mtu, ip6_sprintf(&ip6->ip6_src), 388 ndi->maxmtu)); 389 } 390 } else { 391 nd6log((LOG_INFO, "nd6_ra_input: mtu option " 392 "mtu=%d sent from %s; maxmtu unknown, " 393 "ignoring\n", 394 mtu, ip6_sprintf(&ip6->ip6_src))); 395 } 396 } 397 398 skip: 399 400 /* 401 * Source link layer address 402 */ 403 { 404 char *lladdr = NULL; 405 int lladdrlen = 0; 406 407 if (ndopts.nd_opts_src_lladdr) { 408 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1); 409 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3; 410 } 411 412 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 413 nd6log((LOG_INFO, 414 "nd6_ra_input: lladdrlen mismatch for %s " 415 "(if %d, RA packet %d)\n", 416 ip6_sprintf(&saddr6), ifp->if_addrlen, lladdrlen - 2)); 417 goto bad; 418 } 419 420 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_ADVERT, 0); 421 422 /* 423 * Installing a link-layer address might change the state of the 424 * router's neighbor cache, which might also affect our on-link 425 * detection of adveritsed prefixes. 426 */ 427 pfxlist_onlink_check(); 428 } 429 430 freeit: 431 m_freem(m); 432 return; 433 434 bad: 435 icmp6stat.icp6s_badra++; 436 m_freem(m); 437 } 438 439 /* 440 * default router list proccessing sub routines 441 */ 442 443 /* tell the change to user processes watching the routing socket. */ 444 static void 445 nd6_rtmsg(cmd, rt) 446 int cmd; 447 struct rtentry *rt; 448 { 449 struct rt_addrinfo info; 450 451 bzero((caddr_t)&info, sizeof(info)); 452 info.rti_info[RTAX_DST] = rt_key(rt); 453 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 454 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 455 info.rti_info[RTAX_IFP] = 456 (struct sockaddr *)TAILQ_FIRST(&rt->rt_ifp->if_addrlist); 457 info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr; 458 459 rt_missmsg(cmd, &info, rt->rt_flags, 0); 460 } 461 462 void 463 defrouter_addreq(new) 464 struct nd_defrouter *new; 465 { 466 struct sockaddr_in6 def, mask, gate; 467 struct rtentry *newrt = NULL; 468 int s; 469 470 Bzero(&def, sizeof(def)); 471 Bzero(&mask, sizeof(mask)); 472 Bzero(&gate, sizeof(gate)); 473 474 def.sin6_len = mask.sin6_len = gate.sin6_len 475 = sizeof(struct sockaddr_in6); 476 def.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6; 477 gate.sin6_addr = new->rtaddr; 478 479 s = splnet(); 480 (void)rtrequest(RTM_ADD, (struct sockaddr *)&def, 481 (struct sockaddr *)&gate, (struct sockaddr *)&mask, 482 RTF_GATEWAY, &newrt); 483 if (newrt) { 484 nd6_rtmsg(RTM_ADD, newrt); /* tell user process */ 485 newrt->rt_refcnt--; 486 } 487 splx(s); 488 return; 489 } 490 491 /* Add a route to a given interface as default */ 492 void 493 defrouter_addifreq(ifp) 494 struct ifnet *ifp; 495 { 496 struct sockaddr_in6 def, mask; 497 struct ifaddr *ifa; 498 struct rtentry *newrt = NULL; 499 int error, flags; 500 501 bzero(&def, sizeof(def)); 502 bzero(&mask, sizeof(mask)); 503 504 def.sin6_len = mask.sin6_len = sizeof(struct sockaddr_in6); 505 def.sin6_family = mask.sin6_family = AF_INET6; 506 507 /* 508 * Search for an ifaddr beloging to the specified interface. 509 * XXX: An IPv6 address are required to be assigned on the interface. 510 */ 511 if ((ifa = ifaof_ifpforaddr((struct sockaddr *)&def, ifp)) == NULL) { 512 nd6log((LOG_ERR, /* better error? */ 513 "defrouter_addifreq: failed to find an ifaddr " 514 "to install a route to interface %s\n", 515 if_name(ifp))); 516 return; 517 } 518 519 flags = ifa->ifa_flags; 520 error = rtrequest(RTM_ADD, (struct sockaddr *)&def, ifa->ifa_addr, 521 (struct sockaddr *)&mask, flags, &newrt); 522 if (error != 0) { 523 nd6log((LOG_ERR, 524 "defrouter_addifreq: failed to install a route to " 525 "interface %s (errno = %d)\n", 526 if_name(ifp), error)); 527 528 if (newrt) /* maybe unnecessary, but do it for safety */ 529 newrt->rt_refcnt--; 530 } else { 531 if (newrt) { 532 nd6_rtmsg(RTM_ADD, newrt); 533 newrt->rt_refcnt--; 534 } 535 } 536 } 537 538 struct nd_defrouter * 539 defrouter_lookup(addr, ifp) 540 struct in6_addr *addr; 541 struct ifnet *ifp; 542 { 543 struct nd_defrouter *dr; 544 545 for (dr = TAILQ_FIRST(&nd_defrouter); dr; 546 dr = TAILQ_NEXT(dr, dr_entry)) { 547 if (dr->ifp == ifp && IN6_ARE_ADDR_EQUAL(addr, &dr->rtaddr)) 548 return(dr); 549 } 550 551 return(NULL); /* search failed */ 552 } 553 554 void 555 defrouter_delreq(dr, dofree) 556 struct nd_defrouter *dr; 557 int dofree; 558 { 559 struct sockaddr_in6 def, mask, gate; 560 struct rtentry *oldrt = NULL; 561 562 Bzero(&def, sizeof(def)); 563 Bzero(&mask, sizeof(mask)); 564 Bzero(&gate, sizeof(gate)); 565 566 def.sin6_len = mask.sin6_len = gate.sin6_len 567 = sizeof(struct sockaddr_in6); 568 def.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6; 569 gate.sin6_addr = dr->rtaddr; 570 571 rtrequest(RTM_DELETE, (struct sockaddr *)&def, 572 (struct sockaddr *)&gate, 573 (struct sockaddr *)&mask, 574 RTF_GATEWAY, &oldrt); 575 if (oldrt) { 576 nd6_rtmsg(RTM_DELETE, oldrt); 577 if (oldrt->rt_refcnt <= 0) { 578 /* 579 * XXX: borrowed from the RTM_DELETE case of 580 * rtrequest(). 581 */ 582 oldrt->rt_refcnt++; 583 rtfree(oldrt); 584 } 585 } 586 587 if (dofree) /* XXX: necessary? */ 588 free(dr, M_IP6NDP); 589 } 590 591 void 592 defrtrlist_del(dr) 593 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 free(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() 645 { 646 int s = splnet(); 647 struct nd_defrouter *dr, anydr; 648 struct rtentry *rt = NULL; 649 struct llinfo_nd6 *ln = NULL; 650 651 /* 652 * Search for a (probably) reachable router from the list. 653 */ 654 for (dr = TAILQ_FIRST(&nd_defrouter); dr; 655 dr = TAILQ_NEXT(dr, dr_entry)) { 656 if ((rt = nd6_lookup(&dr->rtaddr, 0, dr->ifp)) && 657 (ln = (struct llinfo_nd6 *)rt->rt_llinfo) && 658 ND6_IS_LLINFO_PROBREACH(ln)) { 659 /* Got it, and move it to the head */ 660 TAILQ_REMOVE(&nd_defrouter, dr, dr_entry); 661 TAILQ_INSERT_HEAD(&nd_defrouter, dr, dr_entry); 662 break; 663 } 664 } 665 666 if ((dr = TAILQ_FIRST(&nd_defrouter))) { 667 /* 668 * De-install the previous default gateway and install 669 * a new one. 670 * Note that if there is no reachable router in the list, 671 * the head entry will be used anyway. 672 * XXX: do we have to check the current routing table entry? 673 */ 674 bzero(&anydr, sizeof(anydr)); 675 defrouter_delreq(&anydr, 0); 676 defrouter_addreq(dr); 677 } 678 else { 679 /* 680 * The Default Router List is empty, so install the default 681 * route to an inteface. 682 * XXX: The specification does not say this mechanism should 683 * be restricted to hosts, but this would be not useful 684 * (even harmful) for routers. 685 */ 686 if (!ip6_forwarding) { 687 /* 688 * De-install the current default route 689 * in advance. 690 */ 691 bzero(&anydr, sizeof(anydr)); 692 defrouter_delreq(&anydr, 0); 693 if (nd6_defifp) { 694 /* 695 * Install a route to the default interface 696 * as default route. 697 * XXX: we enable this for host only, because 698 * this may override a default route installed 699 * a user process (e.g. routing daemon) in a 700 * router case. 701 */ 702 defrouter_addifreq(nd6_defifp); 703 } else { 704 nd6log((LOG_INFO, "defrouter_select: " 705 "there's no default router and no default" 706 " interface\n")); 707 } 708 } 709 } 710 711 splx(s); 712 return; 713 } 714 715 static struct nd_defrouter * 716 defrtrlist_update(new) 717 struct nd_defrouter *new; 718 { 719 struct nd_defrouter *dr, *n; 720 int s = splnet(); 721 722 if ((dr = defrouter_lookup(&new->rtaddr, new->ifp)) != NULL) { 723 /* entry exists */ 724 if (new->rtlifetime == 0) { 725 defrtrlist_del(dr); 726 dr = NULL; 727 } else { 728 /* override */ 729 dr->flags = new->flags; /* xxx flag check */ 730 dr->rtlifetime = new->rtlifetime; 731 dr->expire = new->expire; 732 } 733 splx(s); 734 return(dr); 735 } 736 737 /* entry does not exist */ 738 if (new->rtlifetime == 0) { 739 splx(s); 740 return(NULL); 741 } 742 743 n = (struct nd_defrouter *)malloc(sizeof(*n), M_IP6NDP, M_NOWAIT); 744 if (n == NULL) { 745 splx(s); 746 return(NULL); 747 } 748 bzero(n, sizeof(*n)); 749 *n = *new; 750 751 /* 752 * Insert the new router at the end of the Default Router List. 753 * If there is no other router, install it anyway. Otherwise, 754 * just continue to use the current default router. 755 */ 756 TAILQ_INSERT_TAIL(&nd_defrouter, n, dr_entry); 757 if (TAILQ_FIRST(&nd_defrouter) == n) 758 defrouter_select(); 759 splx(s); 760 761 return(n); 762 } 763 764 static struct nd_pfxrouter * 765 pfxrtr_lookup(pr, dr) 766 struct nd_prefix *pr; 767 struct nd_defrouter *dr; 768 { 769 struct nd_pfxrouter *search; 770 771 for (search = pr->ndpr_advrtrs.lh_first; search; search = search->pfr_next) { 772 if (search->router == dr) 773 break; 774 } 775 776 return(search); 777 } 778 779 static void 780 pfxrtr_add(pr, dr) 781 struct nd_prefix *pr; 782 struct nd_defrouter *dr; 783 { 784 struct nd_pfxrouter *new; 785 786 new = (struct nd_pfxrouter *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT); 787 if (new == NULL) 788 return; 789 bzero(new, sizeof(*new)); 790 new->router = dr; 791 792 LIST_INSERT_HEAD(&pr->ndpr_advrtrs, new, pfr_entry); 793 794 pfxlist_onlink_check(); 795 } 796 797 static void 798 pfxrtr_del(pfr) 799 struct nd_pfxrouter *pfr; 800 { 801 LIST_REMOVE(pfr, pfr_entry); 802 free(pfr, M_IP6NDP); 803 } 804 805 struct nd_prefix * 806 nd6_prefix_lookup(pr) 807 struct nd_prefix *pr; 808 { 809 struct nd_prefix *search; 810 811 for (search = nd_prefix.lh_first; search; search = search->ndpr_next) { 812 if (pr->ndpr_ifp == search->ndpr_ifp && 813 pr->ndpr_plen == search->ndpr_plen && 814 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr, 815 &search->ndpr_prefix.sin6_addr, 816 pr->ndpr_plen) 817 ) { 818 break; 819 } 820 } 821 822 return(search); 823 } 824 825 int 826 nd6_prelist_add(pr, dr, newp) 827 struct nd_prefix *pr, **newp; 828 struct nd_defrouter *dr; 829 { 830 struct nd_prefix *new = NULL; 831 int i, s; 832 833 new = (struct nd_prefix *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT); 834 if (new == NULL) 835 return ENOMEM; 836 bzero(new, sizeof(*new)); 837 *new = *pr; 838 if (newp != NULL) 839 *newp = new; 840 841 /* initilization */ 842 LIST_INIT(&new->ndpr_advrtrs); 843 in6_prefixlen2mask(&new->ndpr_mask, new->ndpr_plen); 844 /* make prefix in the canonical form */ 845 for (i = 0; i < 4; i++) 846 new->ndpr_prefix.sin6_addr.s6_addr32[i] &= 847 new->ndpr_mask.s6_addr32[i]; 848 849 s = splnet(); 850 /* link ndpr_entry to nd_prefix list */ 851 LIST_INSERT_HEAD(&nd_prefix, new, ndpr_entry); 852 splx(s); 853 854 /* ND_OPT_PI_FLAG_ONLINK processing */ 855 if (new->ndpr_raf_onlink) { 856 int e; 857 858 if ((e = nd6_prefix_onlink(new)) != 0) { 859 nd6log((LOG_ERR, "nd6_prelist_add: failed to make " 860 "the prefix %s/%d on-link on %s (errno=%d)\n", 861 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 862 pr->ndpr_plen, if_name(pr->ndpr_ifp), e)); 863 /* proceed anyway. XXX: is it correct? */ 864 } 865 } 866 867 if (dr) { 868 pfxrtr_add(new, dr); 869 } 870 871 return 0; 872 } 873 874 void 875 prelist_remove(pr) 876 struct nd_prefix *pr; 877 { 878 struct nd_pfxrouter *pfr, *next; 879 int e, s; 880 881 /* make sure to invalidate the prefix until it is really freed. */ 882 pr->ndpr_vltime = 0; 883 pr->ndpr_pltime = 0; 884 #if 0 885 /* 886 * Though these flags are now meaningless, we'd rather keep the value 887 * not to confuse users when executing "ndp -p". 888 */ 889 pr->ndpr_raf_onlink = 0; 890 pr->ndpr_raf_auto = 0; 891 #endif 892 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0 && 893 (e = nd6_prefix_offlink(pr)) != 0) { 894 nd6log((LOG_ERR, "prelist_remove: failed to make %s/%d offlink " 895 "on %s, errno=%d\n", 896 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 897 pr->ndpr_plen, if_name(pr->ndpr_ifp), e)); 898 /* what should we do? */ 899 } 900 901 if (pr->ndpr_refcnt > 0) 902 return; /* notice here? */ 903 904 s = splnet(); 905 906 /* unlink ndpr_entry from nd_prefix list */ 907 LIST_REMOVE(pr, ndpr_entry); 908 909 /* free list of routers that adversed the prefix */ 910 for (pfr = pr->ndpr_advrtrs.lh_first; pfr; pfr = next) { 911 next = pfr->pfr_next; 912 913 free(pfr, M_IP6NDP); 914 } 915 splx(s); 916 917 free(pr, M_IP6NDP); 918 919 pfxlist_onlink_check(); 920 } 921 922 int 923 prelist_update(new, dr, m) 924 struct nd_prefix *new; 925 struct nd_defrouter *dr; /* may be NULL */ 926 struct mbuf *m; 927 { 928 struct in6_ifaddr *ia6 = NULL, *ia6_match = NULL; 929 struct ifaddr *ifa; 930 struct ifnet *ifp = new->ndpr_ifp; 931 struct nd_prefix *pr; 932 int s = splnet(); 933 int error = 0; 934 int newprefix = 0; 935 int auth; 936 struct in6_addrlifetime lt6_tmp; 937 938 auth = 0; 939 if (m) { 940 /* 941 * Authenticity for NA consists authentication for 942 * both IP header and IP datagrams, doesn't it ? 943 */ 944 #if defined(M_AUTHIPHDR) && defined(M_AUTHIPDGM) 945 auth = (m->m_flags & M_AUTHIPHDR 946 && m->m_flags & M_AUTHIPDGM) ? 1 : 0; 947 #endif 948 } 949 950 951 if ((pr = nd6_prefix_lookup(new)) != NULL) { 952 /* 953 * nd6_prefix_lookup() ensures that pr and new have the same 954 * prefix on a same interface. 955 */ 956 957 /* 958 * Update prefix information. Note that the on-link (L) bit 959 * and the autonomous (A) bit should NOT be changed from 1 960 * to 0. 961 */ 962 if (new->ndpr_raf_onlink == 1) 963 pr->ndpr_raf_onlink = 1; 964 if (new->ndpr_raf_auto == 1) 965 pr->ndpr_raf_auto = 1; 966 if (new->ndpr_raf_onlink) { 967 pr->ndpr_vltime = new->ndpr_vltime; 968 pr->ndpr_pltime = new->ndpr_pltime; 969 pr->ndpr_preferred = new->ndpr_preferred; 970 pr->ndpr_expire = new->ndpr_expire; 971 } 972 973 if (new->ndpr_raf_onlink && 974 (pr->ndpr_stateflags & NDPRF_ONLINK) == 0) { 975 int e; 976 977 if ((e = nd6_prefix_onlink(pr)) != 0) { 978 nd6log((LOG_ERR, 979 "prelist_update: failed to make " 980 "the prefix %s/%d on-link on %s " 981 "(errno=%d)\n", 982 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 983 pr->ndpr_plen, if_name(pr->ndpr_ifp), e)); 984 /* proceed anyway. XXX: is it correct? */ 985 } 986 } 987 988 if (dr && pfxrtr_lookup(pr, dr) == NULL) 989 pfxrtr_add(pr, dr); 990 } else { 991 struct nd_prefix *newpr = NULL; 992 993 newprefix = 1; 994 995 if (new->ndpr_vltime == 0) 996 goto end; 997 if (new->ndpr_raf_onlink == 0 && new->ndpr_raf_auto == 0) 998 goto end; 999 1000 bzero(&new->ndpr_addr, sizeof(struct in6_addr)); 1001 1002 error = nd6_prelist_add(new, dr, &newpr); 1003 if (error != 0 || newpr == NULL) { 1004 nd6log((LOG_NOTICE, "prelist_update: " 1005 "nd6_prelist_add failed for %s/%d on %s " 1006 "errno=%d, returnpr=%p\n", 1007 ip6_sprintf(&new->ndpr_prefix.sin6_addr), 1008 new->ndpr_plen, if_name(new->ndpr_ifp), 1009 error, newpr)); 1010 goto end; /* we should just give up in this case. */ 1011 } 1012 1013 /* 1014 * XXX: from the ND point of view, we can ignore a prefix 1015 * with the on-link bit being zero. However, we need a 1016 * prefix structure for references from autoconfigured 1017 * addresses. Thus, we explicitly make suret that the prefix 1018 * itself expires now. 1019 */ 1020 if (newpr->ndpr_raf_onlink == 0) { 1021 newpr->ndpr_vltime = 0; 1022 newpr->ndpr_pltime = 0; 1023 in6_init_prefix_ltimes(newpr); 1024 } 1025 1026 pr = newpr; 1027 } 1028 1029 /* 1030 * Address autoconfiguration based on Section 5.5.3 of RFC 2462. 1031 * Note that pr must be non NULL at this point. 1032 */ 1033 1034 /* 5.5.3 (a). Ignore the prefix without the A bit set. */ 1035 if (!new->ndpr_raf_auto) 1036 goto afteraddrconf; 1037 1038 /* 1039 * 5.5.3 (b). the link-local prefix should have been ignored in 1040 * nd6_ra_input. 1041 */ 1042 1043 /* 1044 * 5.5.3 (c). Consistency check on lifetimes: pltime <= vltime. 1045 * This should have been done in nd6_ra_input. 1046 */ 1047 1048 /* 1049 * 5.5.3 (d). If the prefix advertised does not match the prefix of an 1050 * address already in the list, and the Valid Lifetime is not 0, 1051 * form an address. Note that even a manually configured address 1052 * should reject autoconfiguration of a new address. 1053 */ 1054 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 1055 { 1056 struct in6_ifaddr *ifa6; 1057 int ifa_plen; 1058 u_int32_t storedlifetime; 1059 1060 if (ifa->ifa_addr->sa_family != AF_INET6) 1061 continue; 1062 1063 ifa6 = (struct in6_ifaddr *)ifa; 1064 1065 /* 1066 * Spec is not clear here, but I believe we should concentrate 1067 * on unicast (i.e. not anycast) addresses. 1068 * XXX: other ia6_flags? detached or duplicated? 1069 */ 1070 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0) 1071 continue; 1072 1073 ifa_plen = in6_mask2len(&ifa6->ia_prefixmask.sin6_addr, NULL); 1074 if (ifa_plen != new->ndpr_plen || 1075 !in6_are_prefix_equal(&ifa6->ia_addr.sin6_addr, 1076 &new->ndpr_prefix.sin6_addr, 1077 ifa_plen)) 1078 continue; 1079 1080 if (ia6_match == NULL) /* remember the first one */ 1081 ia6_match = ifa6; 1082 1083 if ((ifa6->ia6_flags & IN6_IFF_AUTOCONF) == 0) 1084 continue; 1085 1086 /* 1087 * An already autoconfigured address matched. Now that we 1088 * are sure there is at least one matched address, we can 1089 * proceed to 5.5.3. (e): update the lifetimes according to the 1090 * "two hours" rule and the privacy extension. 1091 */ 1092 #define TWOHOUR (120*60) 1093 lt6_tmp = ifa6->ia6_lifetime; 1094 1095 storedlifetime = IFA6_IS_INVALID(ifa6) ? 0 : 1096 (lt6_tmp.ia6t_expire - time_second); 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) != 0) { 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 splx(s); 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(pr) 1215 struct nd_prefix *pr; 1216 { 1217 struct nd_pfxrouter *pfxrtr; 1218 struct rtentry *rt; 1219 struct llinfo_nd6 *ln; 1220 1221 for (pfxrtr = LIST_FIRST(&pr->ndpr_advrtrs); pfxrtr; 1222 pfxrtr = LIST_NEXT(pfxrtr, pfr_entry)) { 1223 if ((rt = nd6_lookup(&pfxrtr->router->rtaddr, 0, 1224 pfxrtr->router->ifp)) && 1225 (ln = (struct llinfo_nd6 *)rt->rt_llinfo) && 1226 ND6_IS_LLINFO_PROBREACH(ln)) 1227 break; /* found */ 1228 } 1229 1230 return(pfxrtr); 1231 1232 } 1233 1234 /* 1235 * Check if each prefix in the prefix list has at least one available router 1236 * that advertised the prefix (a router is "available" if its neighbor cache 1237 * entry is reachable or probably reachable). 1238 * If the check fails, the prefix may be off-link, because, for example, 1239 * we have moved from the network but the lifetime of the prefix has not 1240 * expired yet. So we should not use the prefix if there is another prefix 1241 * that has an available router. 1242 * But, if there is no prefix that has an available router, we still regards 1243 * all the prefixes as on-link. This is because we can't tell if all the 1244 * routers are simply dead or if we really moved from the network and there 1245 * is no router around us. 1246 */ 1247 void 1248 pfxlist_onlink_check() 1249 { 1250 struct nd_prefix *pr; 1251 struct in6_ifaddr *ifa; 1252 1253 /* 1254 * Check if there is a prefix that has a reachable advertising 1255 * router. 1256 */ 1257 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 1258 if (pr->ndpr_raf_onlink && find_pfxlist_reachable_router(pr)) 1259 break; 1260 } 1261 1262 if (pr) { 1263 /* 1264 * There is at least one prefix that has a reachable router. 1265 * Detach prefixes which have no reachable advertising 1266 * router, and attach other prefixes. 1267 */ 1268 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 1269 /* XXX: a link-local prefix should never be detached */ 1270 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr)) 1271 continue; 1272 1273 /* 1274 * we aren't interested in prefixes without the L bit 1275 * set. 1276 */ 1277 if (pr->ndpr_raf_onlink == 0) 1278 continue; 1279 1280 if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 && 1281 find_pfxlist_reachable_router(pr) == NULL) 1282 pr->ndpr_stateflags |= NDPRF_DETACHED; 1283 if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 && 1284 find_pfxlist_reachable_router(pr) != 0) 1285 pr->ndpr_stateflags &= ~NDPRF_DETACHED; 1286 } 1287 } else { 1288 /* there is no prefix that has a reachable router */ 1289 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 1290 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr)) 1291 continue; 1292 1293 if (pr->ndpr_raf_onlink == 0) 1294 continue; 1295 1296 if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0) 1297 pr->ndpr_stateflags &= ~NDPRF_DETACHED; 1298 } 1299 } 1300 1301 /* 1302 * Remove each interface route associated with a (just) detached 1303 * prefix, and reinstall the interface route for a (just) attached 1304 * prefix. Note that all attempt of reinstallation does not 1305 * necessarily success, when a same prefix is shared among multiple 1306 * interfaces. Such cases will be handled in nd6_prefix_onlink, 1307 * so we don't have to care about them. 1308 */ 1309 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 1310 int e; 1311 1312 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr)) 1313 continue; 1314 1315 if (pr->ndpr_raf_onlink == 0) 1316 continue; 1317 1318 if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 && 1319 (pr->ndpr_stateflags & NDPRF_ONLINK) != 0) { 1320 if ((e = nd6_prefix_offlink(pr)) != 0) { 1321 nd6log((LOG_ERR, 1322 "pfxlist_onlink_check: failed to " 1323 "make %s/%d offlink, errno=%d\n", 1324 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 1325 pr->ndpr_plen, e)); 1326 } 1327 } 1328 if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 && 1329 (pr->ndpr_stateflags & NDPRF_ONLINK) == 0 && 1330 pr->ndpr_raf_onlink) { 1331 if ((e = nd6_prefix_onlink(pr)) != 0) { 1332 nd6log((LOG_ERR, 1333 "pfxlist_onlink_check: failed to " 1334 "make %s/%d offlink, errno=%d\n", 1335 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 1336 pr->ndpr_plen, e)); 1337 } 1338 } 1339 } 1340 1341 /* 1342 * Changes on the prefix status might affect address status as well. 1343 * Make sure that all addresses derived from an attached prefix are 1344 * attached, and that all addresses derived from a detached prefix are 1345 * detached. Note, however, that a manually configured address should 1346 * always be attached. 1347 * The precise detection logic is same as the one for prefixes. 1348 */ 1349 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) { 1350 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0) 1351 continue; 1352 1353 if (ifa->ia6_ndpr == NULL) { 1354 /* 1355 * This can happen when we first configure the address 1356 * (i.e. the address exists, but the prefix does not). 1357 * XXX: complicated relationships... 1358 */ 1359 continue; 1360 } 1361 1362 if (find_pfxlist_reachable_router(ifa->ia6_ndpr)) 1363 break; 1364 } 1365 if (ifa) { 1366 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) { 1367 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0) 1368 continue; 1369 1370 if (ifa->ia6_ndpr == NULL) /* XXX: see above. */ 1371 continue; 1372 1373 if (find_pfxlist_reachable_router(ifa->ia6_ndpr)) 1374 ifa->ia6_flags &= ~IN6_IFF_DETACHED; 1375 else 1376 ifa->ia6_flags |= IN6_IFF_DETACHED; 1377 } 1378 } 1379 else { 1380 for (ifa = in6_ifaddr; ifa; ifa = ifa->ia_next) { 1381 if ((ifa->ia6_flags & IN6_IFF_AUTOCONF) == 0) 1382 continue; 1383 1384 ifa->ia6_flags &= ~IN6_IFF_DETACHED; 1385 } 1386 } 1387 } 1388 1389 int 1390 nd6_prefix_onlink(pr) 1391 struct nd_prefix *pr; 1392 { 1393 struct ifaddr *ifa; 1394 struct ifnet *ifp = pr->ndpr_ifp; 1395 struct sockaddr_in6 mask6; 1396 struct nd_prefix *opr; 1397 u_long rtflags; 1398 int error = 0; 1399 struct rtentry *rt = NULL; 1400 1401 /* sanity check */ 1402 if ((pr->ndpr_stateflags & NDPRF_ONLINK) != 0) { 1403 nd6log((LOG_ERR, 1404 "nd6_prefix_onlink: %s/%d is already on-link\n", 1405 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), pr->ndpr_plen); 1406 return(EEXIST)); 1407 } 1408 1409 /* 1410 * Add the interface route associated with the prefix. Before 1411 * installing the route, check if there's the same prefix on another 1412 * interface, and the prefix has already installed the interface route. 1413 * Although such a configuration is expected to be rare, we explicitly 1414 * allow it. 1415 */ 1416 for (opr = nd_prefix.lh_first; opr; opr = opr->ndpr_next) { 1417 if (opr == pr) 1418 continue; 1419 1420 if ((opr->ndpr_stateflags & NDPRF_ONLINK) == 0) 1421 continue; 1422 1423 if (opr->ndpr_plen == pr->ndpr_plen && 1424 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr, 1425 &opr->ndpr_prefix.sin6_addr, 1426 pr->ndpr_plen)) 1427 return(0); 1428 } 1429 1430 /* 1431 * We prefer link-local addresses as the associated interface address. 1432 */ 1433 /* search for a link-local addr */ 1434 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 1435 IN6_IFF_NOTREADY| 1436 IN6_IFF_ANYCAST); 1437 if (ifa == NULL) { 1438 /* XXX: freebsd does not have ifa_ifwithaf */ 1439 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 1440 { 1441 if (ifa->ifa_addr->sa_family == AF_INET6) 1442 break; 1443 } 1444 /* should we care about ia6_flags? */ 1445 } 1446 if (ifa == NULL) { 1447 /* 1448 * This can still happen, when, for example, we receive an RA 1449 * containing a prefix with the L bit set and the A bit clear, 1450 * after removing all IPv6 addresses on the receiving 1451 * interface. This should, of course, be rare though. 1452 */ 1453 nd6log((LOG_NOTICE, 1454 "nd6_prefix_onlink: failed to find any ifaddr" 1455 " to add route for a prefix(%s/%d) on %s\n", 1456 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 1457 pr->ndpr_plen, if_name(ifp))); 1458 return(0); 1459 } 1460 1461 /* 1462 * in6_ifinit() sets nd6_rtrequest to ifa_rtrequest for all ifaddrs. 1463 * ifa->ifa_rtrequest = nd6_rtrequest; 1464 */ 1465 bzero(&mask6, sizeof(mask6)); 1466 mask6.sin6_len = sizeof(mask6); 1467 mask6.sin6_addr = pr->ndpr_mask; 1468 rtflags = ifa->ifa_flags | RTF_CLONING | RTF_UP; 1469 if (nd6_need_cache(ifp)) { 1470 /* explicitly set in case ifa_flags does not set the flag. */ 1471 rtflags |= RTF_CLONING; 1472 } else { 1473 /* 1474 * explicitly clear the cloning bit in case ifa_flags sets it. 1475 */ 1476 rtflags &= ~RTF_CLONING; 1477 } 1478 error = rtrequest(RTM_ADD, (struct sockaddr *)&pr->ndpr_prefix, 1479 ifa->ifa_addr, (struct sockaddr *)&mask6, 1480 rtflags, &rt); 1481 if (error == 0) { 1482 if (rt != NULL) /* this should be non NULL, though */ 1483 nd6_rtmsg(RTM_ADD, rt); 1484 pr->ndpr_stateflags |= NDPRF_ONLINK; 1485 } 1486 else { 1487 nd6log((LOG_ERR, "nd6_prefix_onlink: failed to add route for a" 1488 " prefix (%s/%d) on %s, gw=%s, mask=%s, flags=%lx " 1489 "errno = %d\n", 1490 ip6_sprintf(&pr->ndpr_prefix.sin6_addr), 1491 pr->ndpr_plen, if_name(ifp), 1492 ip6_sprintf(&((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr), 1493 ip6_sprintf(&mask6.sin6_addr), rtflags, error)); 1494 } 1495 1496 if (rt != NULL) 1497 rt->rt_refcnt--; 1498 1499 return(error); 1500 } 1501 1502 int 1503 nd6_prefix_offlink(pr) 1504 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) == 0) { 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) != 0) 1550 continue; 1551 1552 /* 1553 * KAME specific: detached prefixes should not be 1554 * on-link. 1555 */ 1556 if ((opr->ndpr_stateflags & NDPRF_DETACHED) != 0) 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 static struct in6_ifaddr * 1598 in6_ifadd(pr, ifid) 1599 struct nd_prefix *pr; 1600 struct in6_addr *ifid; /* Mobile IPv6 addition */ 1601 { 1602 struct ifnet *ifp = pr->ndpr_ifp; 1603 struct ifaddr *ifa; 1604 struct in6_aliasreq ifra; 1605 struct in6_ifaddr *ia, *ib; 1606 int error, plen0; 1607 struct in6_addr mask; 1608 int prefixlen = pr->ndpr_plen; 1609 1610 in6_len2mask(&mask, prefixlen); 1611 1612 /* 1613 * find a link-local address (will be interface ID). 1614 * Is it really mandatory? Theoretically, a global or a site-local 1615 * address can be configured without a link-local address, if we 1616 * have a unique interface identifier... 1617 * 1618 * it is not mandatory to have a link-local address, we can generate 1619 * interface identifier on the fly. we do this because: 1620 * (1) it should be the easiest way to find interface identifier. 1621 * (2) RFC2462 5.4 suggesting the use of the same interface identifier 1622 * for multiple addresses on a single interface, and possible shortcut 1623 * of DAD. we omitted DAD for this reason in the past. 1624 * (3) a user can prevent autoconfiguration of global address 1625 * by removing link-local address by hand (this is partly because we 1626 * don't have other way to control the use of IPv6 on a interface. 1627 * this has been our design choice - cf. NRL's "ifconfig auto"). 1628 * (4) it is easier to manage when an interface has addresses 1629 * with the same interface identifier, than to have multiple addresses 1630 * with different interface identifiers. 1631 * 1632 * Mobile IPv6 addition: allow for caller to specify a wished interface 1633 * ID. This is to not break connections when moving addresses between 1634 * interfaces. 1635 */ 1636 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0);/* 0 is OK? */ 1637 if (ifa) 1638 ib = (struct in6_ifaddr *)ifa; 1639 else 1640 return NULL; 1641 1642 #if 0 /* don't care link local addr state, and always do DAD */ 1643 /* if link-local address is not eligible, do not autoconfigure. */ 1644 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) { 1645 printf("in6_ifadd: link-local address not ready\n"); 1646 return NULL; 1647 } 1648 #endif 1649 1650 /* prefixlen + ifidlen must be equal to 128 */ 1651 plen0 = in6_mask2len(&ib->ia_prefixmask.sin6_addr, NULL); 1652 if (prefixlen != plen0) { 1653 nd6log((LOG_INFO, "in6_ifadd: wrong prefixlen for %s " 1654 "(prefix=%d ifid=%d)\n", 1655 if_name(ifp), prefixlen, 128 - plen0)); 1656 return NULL; 1657 } 1658 1659 /* make ifaddr */ 1660 1661 bzero(&ifra, sizeof(ifra)); 1662 /* 1663 * in6_update_ifa() does not use ifra_name, but we accurately set it 1664 * for safety. 1665 */ 1666 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 1667 ifra.ifra_addr.sin6_family = AF_INET6; 1668 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 1669 /* prefix */ 1670 bcopy(&pr->ndpr_prefix.sin6_addr, &ifra.ifra_addr.sin6_addr, 1671 sizeof(ifra.ifra_addr.sin6_addr)); 1672 ifra.ifra_addr.sin6_addr.s6_addr32[0] &= mask.s6_addr32[0]; 1673 ifra.ifra_addr.sin6_addr.s6_addr32[1] &= mask.s6_addr32[1]; 1674 ifra.ifra_addr.sin6_addr.s6_addr32[2] &= mask.s6_addr32[2]; 1675 ifra.ifra_addr.sin6_addr.s6_addr32[3] &= mask.s6_addr32[3]; 1676 1677 /* interface ID */ 1678 if (ifid == NULL || IN6_IS_ADDR_UNSPECIFIED(ifid)) 1679 ifid = &ib->ia_addr.sin6_addr; 1680 ifra.ifra_addr.sin6_addr.s6_addr32[0] 1681 |= (ifid->s6_addr32[0] & ~mask.s6_addr32[0]); 1682 ifra.ifra_addr.sin6_addr.s6_addr32[1] 1683 |= (ifid->s6_addr32[1] & ~mask.s6_addr32[1]); 1684 ifra.ifra_addr.sin6_addr.s6_addr32[2] 1685 |= (ifid->s6_addr32[2] & ~mask.s6_addr32[2]); 1686 ifra.ifra_addr.sin6_addr.s6_addr32[3] 1687 |= (ifid->s6_addr32[3] & ~mask.s6_addr32[3]); 1688 1689 /* new prefix mask. */ 1690 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 1691 ifra.ifra_prefixmask.sin6_family = AF_INET6; 1692 bcopy(&mask, &ifra.ifra_prefixmask.sin6_addr, 1693 sizeof(ifra.ifra_prefixmask.sin6_addr)); 1694 1695 /* 1696 * lifetime. 1697 * XXX: in6_init_address_ltimes would override these values later. 1698 * We should reconsider this logic. 1699 */ 1700 ifra.ifra_lifetime.ia6t_vltime = pr->ndpr_vltime; 1701 ifra.ifra_lifetime.ia6t_pltime = pr->ndpr_pltime; 1702 1703 /* XXX: scope zone ID? */ 1704 1705 ifra.ifra_flags |= IN6_IFF_AUTOCONF; /* obey autoconf */ 1706 /* 1707 * temporarily set the nopfx flag to avoid conflict. 1708 * XXX: we should reconsider the entire mechanism about prefix 1709 * manipulation. 1710 */ 1711 ifra.ifra_flags |= IN6_IFF_NOPFX; 1712 1713 /* 1714 * keep the new address, regardless of the result of in6_update_ifa. 1715 * XXX: this address is now meaningless. 1716 * We should reconsider its role. 1717 */ 1718 pr->ndpr_addr = ifra.ifra_addr.sin6_addr; 1719 1720 /* allocate ifaddr structure, link into chain, etc. */ 1721 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) { 1722 nd6log((LOG_ERR, 1723 "in6_ifadd: failed to make ifaddr %s on %s (errno=%d)\n", 1724 ip6_sprintf(&ifra.ifra_addr.sin6_addr), if_name(ifp), 1725 error)); 1726 return(NULL); /* ifaddr must not have been allocated. */ 1727 } 1728 1729 ia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr); 1730 1731 return(ia); /* this must NOT be NULL. */ 1732 } 1733 1734 int 1735 in6_tmpifadd(ia0, forcegen) 1736 const struct in6_ifaddr *ia0; /* corresponding public address */ 1737 int forcegen; 1738 { 1739 struct ifnet *ifp = ia0->ia_ifa.ifa_ifp; 1740 struct in6_ifaddr *newia; 1741 struct in6_aliasreq ifra; 1742 int i, error; 1743 int trylimit = 3; /* XXX: adhoc value */ 1744 u_int32_t randid[2]; 1745 time_t vltime0, pltime0; 1746 1747 bzero(&ifra, sizeof(ifra)); 1748 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 1749 ifra.ifra_addr = ia0->ia_addr; 1750 /* copy prefix mask */ 1751 ifra.ifra_prefixmask = ia0->ia_prefixmask; 1752 /* clear the old IFID */ 1753 for (i = 0; i < 4; i++) { 1754 ifra.ifra_addr.sin6_addr.s6_addr32[i] 1755 &= ifra.ifra_prefixmask.sin6_addr.s6_addr32[i]; 1756 } 1757 1758 again: 1759 in6_get_tmpifid(ifp, (u_int8_t *)randid, 1760 (const u_int8_t *)&ia0->ia_addr.sin6_addr.s6_addr[8], 1761 forcegen); 1762 ifra.ifra_addr.sin6_addr.s6_addr32[2] 1763 |= (randid[0] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[2])); 1764 ifra.ifra_addr.sin6_addr.s6_addr32[3] 1765 |= (randid[1] & ~(ifra.ifra_prefixmask.sin6_addr.s6_addr32[3])); 1766 1767 /* 1768 * If by chance the new temporary address is the same as an address 1769 * already assigned to the interface, generate a new randomized 1770 * interface identifier and repeat this step. 1771 * RFC 3041 3.3 (4). 1772 */ 1773 if (in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr) != NULL) { 1774 if (trylimit-- == 0) { 1775 nd6log((LOG_NOTICE, "in6_tmpifadd: failed to find " 1776 "a unique random IFID\n")); 1777 return(EEXIST); 1778 } 1779 forcegen = 1; 1780 goto again; 1781 } 1782 1783 /* 1784 * The Valid Lifetime is the lower of the Valid Lifetime of the 1785 * public address or TEMP_VALID_LIFETIME. 1786 * The Preferred Lifetime is the lower of the Preferred Lifetime 1787 * of the public address or TEMP_PREFERRED_LIFETIME - 1788 * DESYNC_FACTOR. 1789 */ 1790 if (ia0->ia6_lifetime.ia6t_expire != 0) { 1791 vltime0 = IFA6_IS_INVALID(ia0) ? 0 : 1792 (ia0->ia6_lifetime.ia6t_expire - time_second); 1793 if (vltime0 > ip6_temp_valid_lifetime) 1794 vltime0 = ip6_temp_valid_lifetime; 1795 } else 1796 vltime0 = ip6_temp_valid_lifetime; 1797 if (ia0->ia6_lifetime.ia6t_preferred != 0) { 1798 pltime0 = IFA6_IS_DEPRECATED(ia0) ? 0 : 1799 (ia0->ia6_lifetime.ia6t_preferred - time_second); 1800 if (pltime0 > ip6_temp_preferred_lifetime - ip6_desync_factor){ 1801 pltime0 = ip6_temp_preferred_lifetime - 1802 ip6_desync_factor; 1803 } 1804 } else 1805 pltime0 = ip6_temp_preferred_lifetime - ip6_desync_factor; 1806 ifra.ifra_lifetime.ia6t_vltime = vltime0; 1807 ifra.ifra_lifetime.ia6t_pltime = pltime0; 1808 1809 /* 1810 * A temporary address is created only if this calculated Preferred 1811 * Lifetime is greater than REGEN_ADVANCE time units. 1812 */ 1813 if (ifra.ifra_lifetime.ia6t_pltime <= ip6_temp_regen_advance) 1814 return(0); 1815 1816 /* XXX: scope zone ID? */ 1817 1818 ifra.ifra_flags |= (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY); 1819 1820 /* allocate ifaddr structure, link into chain, etc. */ 1821 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) 1822 return(error); 1823 1824 newia = in6ifa_ifpwithaddr(ifp, &ifra.ifra_addr.sin6_addr); 1825 if (newia == NULL) { /* XXX: can it happen? */ 1826 nd6log((LOG_ERR, 1827 "in6_tmpifadd: ifa update succeeded, but we got " 1828 "no ifaddr\n")); 1829 return(EINVAL); /* XXX */ 1830 } 1831 newia->ia6_ndpr = ia0->ia6_ndpr; 1832 newia->ia6_ndpr->ndpr_refcnt++; 1833 1834 /* 1835 * A newly added address might affect the status of other addresses. 1836 * XXX: when the temporary address is generated with a new public 1837 * address, the onlink check is redundant. However, it would be safe 1838 * to do the check explicitly everywhere a new address is generated, 1839 * and, in fact, we surely need the check when we create a new 1840 * temporary address due to deprecation of an old temporary address. 1841 */ 1842 pfxlist_onlink_check(); 1843 1844 return(0); 1845 } 1846 1847 int 1848 in6_init_prefix_ltimes(struct nd_prefix *ndpr) 1849 { 1850 /* check if preferred lifetime > valid lifetime. RFC2462 5.5.3 (c) */ 1851 if (ndpr->ndpr_pltime > ndpr->ndpr_vltime) { 1852 nd6log((LOG_INFO, "in6_init_prefix_ltimes: preferred lifetime" 1853 "(%d) is greater than valid lifetime(%d)\n", 1854 (u_int)ndpr->ndpr_pltime, (u_int)ndpr->ndpr_vltime)); 1855 return (EINVAL); 1856 } 1857 if (ndpr->ndpr_pltime == ND6_INFINITE_LIFETIME) 1858 ndpr->ndpr_preferred = 0; 1859 else 1860 ndpr->ndpr_preferred = time_second + ndpr->ndpr_pltime; 1861 if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME) 1862 ndpr->ndpr_expire = 0; 1863 else 1864 ndpr->ndpr_expire = time_second + ndpr->ndpr_vltime; 1865 1866 return 0; 1867 } 1868 1869 static void 1870 in6_init_address_ltimes(struct nd_prefix *new, struct in6_addrlifetime *lt6) 1871 { 1872 /* Valid lifetime must not be updated unless explicitly specified. */ 1873 /* init ia6t_expire */ 1874 if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME) 1875 lt6->ia6t_expire = 0; 1876 else { 1877 lt6->ia6t_expire = time_second; 1878 lt6->ia6t_expire += lt6->ia6t_vltime; 1879 } 1880 1881 /* init ia6t_preferred */ 1882 if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME) 1883 lt6->ia6t_preferred = 0; 1884 else { 1885 lt6->ia6t_preferred = time_second; 1886 lt6->ia6t_preferred += lt6->ia6t_pltime; 1887 } 1888 } 1889 1890 /* 1891 * Delete all the routing table entries that use the specified gateway. 1892 * XXX: this function causes search through all entries of routing table, so 1893 * it shouldn't be called when acting as a router. 1894 */ 1895 void 1896 rt6_flush(gateway, ifp) 1897 struct in6_addr *gateway; 1898 struct ifnet *ifp; 1899 { 1900 struct radix_node_head *rnh = rt_tables[AF_INET6]; 1901 int s = splnet(); 1902 1903 /* We'll care only link-local addresses */ 1904 if (!IN6_IS_ADDR_LINKLOCAL(gateway)) { 1905 splx(s); 1906 return; 1907 } 1908 /* XXX: hack for KAME's link-local address kludge */ 1909 gateway->s6_addr16[1] = htons(ifp->if_index); 1910 1911 rnh->rnh_walktree(rnh, rt6_deleteroute, (void *)gateway); 1912 splx(s); 1913 } 1914 1915 static int 1916 rt6_deleteroute(rn, arg) 1917 struct radix_node *rn; 1918 void *arg; 1919 { 1920 #define SIN6(s) ((struct sockaddr_in6 *)s) 1921 struct rtentry *rt = (struct rtentry *)rn; 1922 struct in6_addr *gate = (struct in6_addr *)arg; 1923 1924 if (rt->rt_gateway == NULL || rt->rt_gateway->sa_family != AF_INET6) 1925 return(0); 1926 1927 if (!IN6_ARE_ADDR_EQUAL(gate, &SIN6(rt->rt_gateway)->sin6_addr)) 1928 return(0); 1929 1930 /* 1931 * Do not delete a static route. 1932 * XXX: this seems to be a bit ad-hoc. Should we consider the 1933 * 'cloned' bit instead? 1934 */ 1935 if ((rt->rt_flags & RTF_STATIC) != 0) 1936 return(0); 1937 1938 /* 1939 * We delete only host route. This means, in particular, we don't 1940 * delete default route. 1941 */ 1942 if ((rt->rt_flags & RTF_HOST) == 0) 1943 return(0); 1944 1945 return(rtrequest(RTM_DELETE, rt_key(rt), 1946 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0)); 1947 #undef SIN6 1948 } 1949 1950 int 1951 nd6_setdefaultiface(ifindex) 1952 int ifindex; 1953 { 1954 int error = 0; 1955 1956 if (ifindex < 0 || if_index < ifindex) 1957 return(EINVAL); 1958 1959 if (nd6_defifindex != ifindex) { 1960 nd6_defifindex = ifindex; 1961 if (nd6_defifindex > 0) 1962 nd6_defifp = ifnet_byindex(nd6_defifindex); 1963 else 1964 nd6_defifp = NULL; 1965 1966 /* 1967 * If the Default Router List is empty, install a route 1968 * to the specified interface as default or remove the default 1969 * route when the default interface becomes canceled. 1970 * The check for the queue is actually redundant, but 1971 * we do this here to avoid re-install the default route 1972 * if the list is NOT empty. 1973 */ 1974 if (TAILQ_FIRST(&nd_defrouter) == NULL) 1975 defrouter_select(); 1976 1977 /* 1978 * Our current implementation assumes one-to-one maping between 1979 * interfaces and links, so it would be natural to use the 1980 * default interface as the default link. 1981 */ 1982 scope6_setdefault(nd6_defifp); 1983 } 1984 1985 return(error); 1986 }
Cache object: b3589badafa48dd61f8f70ab49e0fa78
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