1 /* $NetBSD: nd6_rtr.c,v 1.28 2001/12/18 03:04:05 itojun Exp $ */ 2 /* $KAME: nd6_rtr.c,v 1.95 2001/02/07 08:09:47 itojun 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 <sys/cdefs.h> 34 __KERNEL_RCSID(0, "$NetBSD: nd6_rtr.c,v 1.28 2001/12/18 03:04:05 itojun Exp $"); 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/ioctl.h> 46 #include <sys/syslog.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 <netinet/ip6.h> 57 #include <netinet6/ip6_var.h> 58 #include <netinet6/nd6.h> 59 #include <netinet/icmp6.h> 60 61 #include <net/net_osdep.h> 62 63 #define SDL(s) ((struct sockaddr_dl *)s) 64 65 static struct nd_defrouter *defrtrlist_update __P((struct nd_defrouter *)); 66 static int prelist_add __P((struct nd_prefix *, struct nd_defrouter *)); 67 static struct nd_prefix *prefix_lookup __P((struct nd_prefix *)); 68 static struct in6_ifaddr *in6_ifadd __P((struct ifnet *, struct in6_addr *, 69 struct in6_addr *, int)); 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 __P((struct nd_prefix *)); 75 static void nd6_detach_prefix __P((struct nd_prefix *)); 76 static void nd6_attach_prefix __P((struct nd_prefix *)); 77 static void defrouter_addifreq __P((struct ifnet *)); 78 79 static void in6_init_address_ltimes __P((struct nd_prefix *ndpr, 80 struct in6_addrlifetime *lt6, 81 int update_vltime)); 82 83 static int rt6_deleteroute __P((struct radix_node *, void *)); 84 85 extern int nd6_recalc_reachtm_interval; 86 87 static struct ifnet *nd6_defifp; 88 int nd6_defifindex; 89 90 /* 91 * Receive Router Solicitation Message - just for routers. 92 * Router solicitation/advertisement is mostly managed by userland program 93 * (rtadvd) so here we have no function like nd6_ra_output(). 94 * 95 * Based on RFC 2461 96 */ 97 void 98 nd6_rs_input(m, off, icmp6len) 99 struct mbuf *m; 100 int off, icmp6len; 101 { 102 struct ifnet *ifp = m->m_pkthdr.rcvif; 103 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 104 struct nd_router_solicit *nd_rs; 105 struct in6_addr saddr6 = ip6->ip6_src; 106 #if 0 107 struct in6_addr daddr6 = ip6->ip6_dst; 108 #endif 109 char *lladdr = NULL; 110 int lladdrlen = 0; 111 #if 0 112 struct sockaddr_dl *sdl = (struct sockaddr_dl *)NULL; 113 struct llinfo_nd6 *ln = (struct llinfo_nd6 *)NULL; 114 struct rtentry *rt = NULL; 115 int is_newentry; 116 #endif 117 union nd_opts ndopts; 118 119 /* If I'm not a router, ignore it. */ 120 if (ip6_accept_rtadv != 0 || ip6_forwarding != 1) 121 goto freeit; 122 123 /* Sanity checks */ 124 if (ip6->ip6_hlim != 255) { 125 nd6log((LOG_ERR, 126 "nd6_rs_input: invalid hlim (%d) from %s to %s on %s\n", 127 ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src), 128 ip6_sprintf(&ip6->ip6_dst), if_name(ifp))); 129 goto bad; 130 } 131 132 /* 133 * Don't update the neighbor cache, if src = ::. 134 * This indicates that the src has no IP address assigned yet. 135 */ 136 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) 137 goto freeit; 138 139 #ifndef PULLDOWN_TEST 140 IP6_EXTHDR_CHECK(m, off, icmp6len,); 141 nd_rs = (struct nd_router_solicit *)((caddr_t)ip6 + off); 142 #else 143 IP6_EXTHDR_GET(nd_rs, struct nd_router_solicit *, m, off, icmp6len); 144 if (nd_rs == NULL) { 145 icmp6stat.icp6s_tooshort++; 146 return; 147 } 148 #endif 149 150 icmp6len -= sizeof(*nd_rs); 151 nd6_option_init(nd_rs + 1, icmp6len, &ndopts); 152 if (nd6_options(&ndopts) < 0) { 153 nd6log((LOG_INFO, 154 "nd6_rs_input: invalid ND option, ignored\n")); 155 /* nd6_options have incremented stats */ 156 goto freeit; 157 } 158 159 if (ndopts.nd_opts_src_lladdr) { 160 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1); 161 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3; 162 } 163 164 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 165 nd6log((LOG_INFO, 166 "nd6_rs_input: lladdrlen mismatch for %s " 167 "(if %d, RS packet %d)\n", 168 ip6_sprintf(&saddr6), ifp->if_addrlen, lladdrlen - 2)); 169 goto bad; 170 } 171 172 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_SOLICIT, 0); 173 174 freeit: 175 m_freem(m); 176 return; 177 178 bad: 179 icmp6stat.icp6s_badrs++; 180 m_freem(m); 181 } 182 183 /* 184 * Receive Router Advertisement Message. 185 * 186 * Based on RFC 2461 187 * TODO: on-link bit on prefix information 188 * TODO: ND_RA_FLAG_{OTHER,MANAGED} processing 189 */ 190 void 191 nd6_ra_input(m, off, icmp6len) 192 struct mbuf *m; 193 int off, icmp6len; 194 { 195 struct ifnet *ifp = m->m_pkthdr.rcvif; 196 struct nd_ifinfo *ndi = &nd_ifinfo[ifp->if_index]; 197 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 198 struct nd_router_advert *nd_ra; 199 struct in6_addr saddr6 = ip6->ip6_src; 200 #if 0 201 struct in6_addr daddr6 = ip6->ip6_dst; 202 int flags; /* = nd_ra->nd_ra_flags_reserved; */ 203 int is_managed = ((flags & ND_RA_FLAG_MANAGED) != 0); 204 int is_other = ((flags & ND_RA_FLAG_OTHER) != 0); 205 #endif 206 union nd_opts ndopts; 207 struct nd_defrouter *dr; 208 209 if (ip6_accept_rtadv == 0) 210 goto freeit; 211 212 if (ip6->ip6_hlim != 255) { 213 nd6log((LOG_ERR, 214 "nd6_ra_input: invalid hlim (%d) from %s to %s on %s\n", 215 ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src), 216 ip6_sprintf(&ip6->ip6_dst), if_name(ifp))); 217 goto bad; 218 } 219 220 if (!IN6_IS_ADDR_LINKLOCAL(&saddr6)) { 221 nd6log((LOG_ERR, 222 "nd6_ra_input: src %s is not link-local\n", 223 ip6_sprintf(&saddr6))); 224 goto bad; 225 } 226 227 #ifndef PULLDOWN_TEST 228 IP6_EXTHDR_CHECK(m, off, icmp6len,); 229 nd_ra = (struct nd_router_advert *)((caddr_t)ip6 + off); 230 #else 231 IP6_EXTHDR_GET(nd_ra, struct nd_router_advert *, m, off, icmp6len); 232 if (nd_ra == NULL) { 233 icmp6stat.icp6s_tooshort++; 234 return; 235 } 236 #endif 237 238 icmp6len -= sizeof(*nd_ra); 239 nd6_option_init(nd_ra + 1, icmp6len, &ndopts); 240 if (nd6_options(&ndopts) < 0) { 241 nd6log((LOG_INFO, 242 "nd6_ra_input: invalid ND option, ignored\n")); 243 /* nd6_options have incremented stats */ 244 goto freeit; 245 } 246 247 { 248 struct nd_defrouter dr0; 249 u_int32_t advreachable = nd_ra->nd_ra_reachable; 250 long time_second = time.tv_sec; 251 252 Bzero(&dr0, sizeof(dr0)); 253 dr0.rtaddr = saddr6; 254 dr0.flags = nd_ra->nd_ra_flags_reserved; 255 dr0.rtlifetime = ntohs(nd_ra->nd_ra_router_lifetime); 256 dr0.expire = time_second + dr0.rtlifetime; 257 dr0.ifp = ifp; 258 /* unspecified or not? (RFC 2461 6.3.4) */ 259 if (advreachable) { 260 NTOHL(advreachable); 261 if (advreachable <= MAX_REACHABLE_TIME && 262 ndi->basereachable != advreachable) { 263 ndi->basereachable = advreachable; 264 ndi->reachable = ND_COMPUTE_RTIME(ndi->basereachable); 265 ndi->recalctm = nd6_recalc_reachtm_interval; /* reset */ 266 } 267 } 268 if (nd_ra->nd_ra_retransmit) 269 ndi->retrans = ntohl(nd_ra->nd_ra_retransmit); 270 if (nd_ra->nd_ra_curhoplimit) 271 ndi->chlim = nd_ra->nd_ra_curhoplimit; 272 dr = defrtrlist_update(&dr0); 273 } 274 275 /* 276 * prefix 277 */ 278 if (ndopts.nd_opts_pi) { 279 struct nd_opt_hdr *pt; 280 struct nd_opt_prefix_info *pi; 281 struct nd_prefix pr; 282 283 for (pt = (struct nd_opt_hdr *)ndopts.nd_opts_pi; 284 pt <= (struct nd_opt_hdr *)ndopts.nd_opts_pi_end; 285 pt = (struct nd_opt_hdr *)((caddr_t)pt + 286 (pt->nd_opt_len << 3))) { 287 if (pt->nd_opt_type != ND_OPT_PREFIX_INFORMATION) 288 continue; 289 pi = (struct nd_opt_prefix_info *)pt; 290 291 if (pi->nd_opt_pi_len != 4) { 292 nd6log((LOG_INFO, 293 "nd6_ra_input: invalid option " 294 "len %d for prefix information option, " 295 "ignored\n", pi->nd_opt_pi_len)); 296 continue; 297 } 298 299 if (128 < pi->nd_opt_pi_prefix_len) { 300 nd6log((LOG_INFO, 301 "nd6_ra_input: invalid prefix " 302 "len %d for prefix information option, " 303 "ignored\n", pi->nd_opt_pi_prefix_len)); 304 continue; 305 } 306 307 if (IN6_IS_ADDR_MULTICAST(&pi->nd_opt_pi_prefix) 308 || IN6_IS_ADDR_LINKLOCAL(&pi->nd_opt_pi_prefix)) { 309 nd6log((LOG_INFO, 310 "nd6_ra_input: invalid prefix " 311 "%s, ignored\n", 312 ip6_sprintf(&pi->nd_opt_pi_prefix))); 313 continue; 314 } 315 316 /* aggregatable unicast address, rfc2374 */ 317 if ((pi->nd_opt_pi_prefix.s6_addr8[0] & 0xe0) == 0x20 318 && pi->nd_opt_pi_prefix_len != 64) { 319 nd6log((LOG_INFO, 320 "nd6_ra_input: invalid prefixlen " 321 "%d for rfc2374 prefix %s, ignored\n", 322 pi->nd_opt_pi_prefix_len, 323 ip6_sprintf(&pi->nd_opt_pi_prefix))); 324 continue; 325 } 326 327 bzero(&pr, sizeof(pr)); 328 pr.ndpr_prefix.sin6_family = AF_INET6; 329 pr.ndpr_prefix.sin6_len = sizeof(pr.ndpr_prefix); 330 pr.ndpr_prefix.sin6_addr = pi->nd_opt_pi_prefix; 331 pr.ndpr_ifp = (struct ifnet *)m->m_pkthdr.rcvif; 332 333 pr.ndpr_raf_onlink = (pi->nd_opt_pi_flags_reserved & 334 ND_OPT_PI_FLAG_ONLINK) ? 1 : 0; 335 pr.ndpr_raf_auto = (pi->nd_opt_pi_flags_reserved & 336 ND_OPT_PI_FLAG_AUTO) ? 1 : 0; 337 pr.ndpr_plen = pi->nd_opt_pi_prefix_len; 338 pr.ndpr_vltime = ntohl(pi->nd_opt_pi_valid_time); 339 pr.ndpr_pltime = 340 ntohl(pi->nd_opt_pi_preferred_time); 341 342 if (in6_init_prefix_ltimes(&pr)) 343 continue; /* prefix lifetime init failed */ 344 345 (void)prelist_update(&pr, dr, m); 346 } 347 } 348 349 /* 350 * MTU 351 */ 352 if (ndopts.nd_opts_mtu && ndopts.nd_opts_mtu->nd_opt_mtu_len == 1) { 353 u_int32_t mtu = ntohl(ndopts.nd_opts_mtu->nd_opt_mtu_mtu); 354 355 /* lower bound */ 356 if (mtu < IPV6_MMTU) { 357 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu option " 358 "mtu=%d sent from %s, ignoring\n", 359 mtu, ip6_sprintf(&ip6->ip6_src))); 360 goto skip; 361 } 362 363 /* upper bound */ 364 if (ndi->maxmtu) { 365 if (mtu <= ndi->maxmtu) { 366 int change = (ndi->linkmtu != mtu); 367 368 ndi->linkmtu = mtu; 369 if (change) /* in6_maxmtu may change */ 370 in6_setmaxmtu(); 371 } else { 372 nd6log((LOG_INFO, "nd6_ra_input: bogus mtu " 373 "mtu=%d sent from %s; " 374 "exceeds maxmtu %d, ignoring\n", 375 mtu, ip6_sprintf(&ip6->ip6_src), 376 ndi->maxmtu)); 377 } 378 } else { 379 nd6log((LOG_INFO, "nd6_ra_input: mtu option " 380 "mtu=%d sent from %s; maxmtu unknown, " 381 "ignoring\n", 382 mtu, ip6_sprintf(&ip6->ip6_src))); 383 } 384 } 385 386 skip: 387 388 /* 389 * Source link layer address 390 */ 391 { 392 char *lladdr = NULL; 393 int lladdrlen = 0; 394 395 if (ndopts.nd_opts_src_lladdr) { 396 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1); 397 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3; 398 } 399 400 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 401 nd6log((LOG_INFO, 402 "nd6_ra_input: lladdrlen mismatch for %s " 403 "(if %d, RA packet %d)\n", 404 ip6_sprintf(&saddr6), ifp->if_addrlen, lladdrlen - 2)); 405 goto bad; 406 } 407 408 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_ROUTER_ADVERT, 0); 409 410 /* 411 * Installing a link-layer address might change the state of the 412 * router's neighbor cache, which might also affect our on-link 413 * detection of adveritsed prefixes. 414 */ 415 pfxlist_onlink_check(); 416 } 417 418 freeit: 419 m_freem(m); 420 return; 421 422 bad: 423 icmp6stat.icp6s_badra++; 424 m_freem(m); 425 } 426 427 /* 428 * default router list proccessing sub routines 429 */ 430 void 431 defrouter_addreq(new) 432 struct nd_defrouter *new; 433 { 434 struct sockaddr_in6 def, mask, gate; 435 int s; 436 437 Bzero(&def, sizeof(def)); 438 Bzero(&mask, sizeof(mask)); 439 Bzero(&gate, sizeof(gate)); 440 441 def.sin6_len = mask.sin6_len = gate.sin6_len 442 = sizeof(struct sockaddr_in6); 443 def.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6; 444 gate.sin6_addr = new->rtaddr; 445 446 s = splsoftnet(); 447 (void)rtrequest(RTM_ADD, (struct sockaddr *)&def, 448 (struct sockaddr *)&gate, (struct sockaddr *)&mask, 449 RTF_GATEWAY, NULL); 450 splx(s); 451 return; 452 } 453 454 /* Add a route to a given interface as default */ 455 static void 456 defrouter_addifreq(ifp) 457 struct ifnet *ifp; 458 { 459 struct sockaddr_in6 def, mask; 460 struct ifaddr *ifa; 461 int error, flags; 462 463 bzero(&def, sizeof(def)); 464 bzero(&mask, sizeof(mask)); 465 466 def.sin6_len = mask.sin6_len = sizeof(struct sockaddr_in6); 467 def.sin6_family = mask.sin6_family = AF_INET6; 468 469 /* 470 * Search for an ifaddr beloging to the specified interface. 471 * XXX: An IPv6 address are required to be assigned on the interface. 472 */ 473 if ((ifa = ifaof_ifpforaddr((struct sockaddr *)&def, ifp)) == NULL) { 474 nd6log((LOG_ERR, /* better error? */ 475 "defrouter_addifreq: failed to find an ifaddr " 476 "to install a route to interface %s\n", 477 if_name(ifp))); 478 return; 479 } 480 481 flags = ifa->ifa_flags; 482 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) 483 flags &= ~RTF_CLONING; 484 error = rtrequest(RTM_ADD, (struct sockaddr *)&def, ifa->ifa_addr, 485 (struct sockaddr *)&mask, flags, NULL); 486 if (error != 0) { 487 nd6log((LOG_ERR, 488 "defrouter_addifreq: failed to install a route to " 489 "interface %s (errno = %d)\n", 490 if_name(ifp), error)); 491 } 492 } 493 494 struct nd_defrouter * 495 defrouter_lookup(addr, ifp) 496 struct in6_addr *addr; 497 struct ifnet *ifp; 498 { 499 struct nd_defrouter *dr; 500 501 for (dr = TAILQ_FIRST(&nd_defrouter); dr; 502 dr = TAILQ_NEXT(dr, dr_entry)) { 503 if (dr->ifp == ifp && IN6_ARE_ADDR_EQUAL(addr, &dr->rtaddr)) 504 return(dr); 505 } 506 507 return(NULL); /* search failed */ 508 } 509 510 void 511 defrouter_delreq(dr, dofree) 512 struct nd_defrouter *dr; 513 int dofree; 514 { 515 struct sockaddr_in6 def, mask, gate; 516 517 Bzero(&def, sizeof(def)); 518 Bzero(&mask, sizeof(mask)); 519 Bzero(&gate, sizeof(gate)); 520 521 def.sin6_len = mask.sin6_len = gate.sin6_len 522 = sizeof(struct sockaddr_in6); 523 def.sin6_family = mask.sin6_family = gate.sin6_family = AF_INET6; 524 gate.sin6_addr = dr->rtaddr; 525 526 rtrequest(RTM_DELETE, (struct sockaddr *)&def, 527 (struct sockaddr *)&gate, 528 (struct sockaddr *)&mask, 529 RTF_GATEWAY, (struct rtentry **)0); 530 531 if (dofree) /* XXX: necessary? */ 532 free(dr, M_IP6NDP); 533 } 534 535 void 536 defrtrlist_del(dr) 537 struct nd_defrouter *dr; 538 { 539 struct nd_defrouter *deldr = NULL; 540 struct nd_prefix *pr; 541 542 /* 543 * Flush all the routing table entries that use the router 544 * as a next hop. 545 */ 546 if (!ip6_forwarding && ip6_accept_rtadv) { 547 /* above is a good condition? */ 548 rt6_flush(&dr->rtaddr, dr->ifp); 549 } 550 551 if (dr == TAILQ_FIRST(&nd_defrouter)) 552 deldr = dr; /* The router is primary. */ 553 554 TAILQ_REMOVE(&nd_defrouter, dr, dr_entry); 555 556 /* 557 * Also delete all the pointers to the router in each prefix lists. 558 */ 559 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 560 struct nd_pfxrouter *pfxrtr; 561 if ((pfxrtr = pfxrtr_lookup(pr, dr)) != NULL) 562 pfxrtr_del(pfxrtr); 563 } 564 pfxlist_onlink_check(); 565 566 /* 567 * If the router is the primary one, choose a new one. 568 * Note that defrouter_select() will remove the current gateway 569 * from the routing table. 570 */ 571 if (deldr) 572 defrouter_select(); 573 574 free(dr, M_IP6NDP); 575 } 576 577 /* 578 * Default Router Selection according to Section 6.3.6 of RFC 2461: 579 * 1) Routers that are reachable or probably reachable should be 580 * preferred. 581 * 2) When no routers on the list are known to be reachable or 582 * probably reachable, routers SHOULD be selected in a round-robin 583 * fashion. 584 * 3) If the Default Router List is empty, assume that all 585 * destinations are on-link. 586 */ 587 void 588 defrouter_select() 589 { 590 int s = splsoftnet(); 591 struct nd_defrouter *dr, anydr; 592 struct rtentry *rt = NULL; 593 struct llinfo_nd6 *ln = NULL; 594 595 /* 596 * Search for a (probably) reachable router from the list. 597 */ 598 for (dr = TAILQ_FIRST(&nd_defrouter); dr; 599 dr = TAILQ_NEXT(dr, dr_entry)) { 600 if ((rt = nd6_lookup(&dr->rtaddr, 0, dr->ifp)) && 601 (ln = (struct llinfo_nd6 *)rt->rt_llinfo) && 602 ND6_IS_LLINFO_PROBREACH(ln)) { 603 /* Got it, and move it to the head */ 604 TAILQ_REMOVE(&nd_defrouter, dr, dr_entry); 605 TAILQ_INSERT_HEAD(&nd_defrouter, dr, dr_entry); 606 break; 607 } 608 } 609 610 if ((dr = TAILQ_FIRST(&nd_defrouter))) { 611 /* 612 * De-install the previous default gateway and install 613 * a new one. 614 * Note that if there is no reachable router in the list, 615 * the head entry will be used anyway. 616 * XXX: do we have to check the current routing table entry? 617 */ 618 bzero(&anydr, sizeof(anydr)); 619 defrouter_delreq(&anydr, 0); 620 defrouter_addreq(dr); 621 } 622 else { 623 /* 624 * The Default Router List is empty, so install the default 625 * route to an inteface. 626 * XXX: The specification does not say this mechanism should 627 * be restricted to hosts, but this would be not useful 628 * (even harmful) for routers. 629 */ 630 if (!ip6_forwarding) { 631 /* 632 * De-install the current default route 633 * in advance. 634 */ 635 bzero(&anydr, sizeof(anydr)); 636 defrouter_delreq(&anydr, 0); 637 if (nd6_defifp) { 638 /* 639 * Install a route to the default interface 640 * as default route. 641 * XXX: we enable this for host only, because 642 * this may override a default route installed 643 * a user process (e.g. routing daemon) in a 644 * router case. 645 */ 646 defrouter_addifreq(nd6_defifp); 647 } else { 648 nd6log((LOG_INFO, "defrouter_select: " 649 "there's no default router and no default" 650 " interface\n")); 651 } 652 } 653 } 654 655 splx(s); 656 return; 657 } 658 659 static struct nd_defrouter * 660 defrtrlist_update(new) 661 struct nd_defrouter *new; 662 { 663 struct nd_defrouter *dr, *n; 664 int s = splsoftnet(); 665 666 if ((dr = defrouter_lookup(&new->rtaddr, new->ifp)) != NULL) { 667 /* entry exists */ 668 if (new->rtlifetime == 0) { 669 defrtrlist_del(dr); 670 dr = NULL; 671 } else { 672 /* override */ 673 dr->flags = new->flags; /* xxx flag check */ 674 dr->rtlifetime = new->rtlifetime; 675 dr->expire = new->expire; 676 } 677 splx(s); 678 return(dr); 679 } 680 681 /* entry does not exist */ 682 if (new->rtlifetime == 0) { 683 splx(s); 684 return(NULL); 685 } 686 687 n = (struct nd_defrouter *)malloc(sizeof(*n), M_IP6NDP, M_NOWAIT); 688 if (n == NULL) { 689 splx(s); 690 return(NULL); 691 } 692 bzero(n, sizeof(*n)); 693 *n = *new; 694 695 /* 696 * Insert the new router at the end of the Default Router List. 697 * If there is no other router, install it anyway. Otherwise, 698 * just continue to use the current default router. 699 */ 700 TAILQ_INSERT_TAIL(&nd_defrouter, n, dr_entry); 701 if (TAILQ_FIRST(&nd_defrouter) == n) 702 defrouter_select(); 703 splx(s); 704 705 return(n); 706 } 707 708 static struct nd_pfxrouter * 709 pfxrtr_lookup(pr, dr) 710 struct nd_prefix *pr; 711 struct nd_defrouter *dr; 712 { 713 struct nd_pfxrouter *search; 714 715 for (search = pr->ndpr_advrtrs.lh_first; search; search = search->pfr_next) { 716 if (search->router == dr) 717 break; 718 } 719 720 return(search); 721 } 722 723 static void 724 pfxrtr_add(pr, dr) 725 struct nd_prefix *pr; 726 struct nd_defrouter *dr; 727 { 728 struct nd_pfxrouter *new; 729 730 new = (struct nd_pfxrouter *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT); 731 if (new == NULL) 732 return; 733 bzero(new, sizeof(*new)); 734 new->router = dr; 735 736 LIST_INSERT_HEAD(&pr->ndpr_advrtrs, new, pfr_entry); 737 738 pfxlist_onlink_check(); 739 } 740 741 static void 742 pfxrtr_del(pfr) 743 struct nd_pfxrouter *pfr; 744 { 745 LIST_REMOVE(pfr, pfr_entry); 746 free(pfr, M_IP6NDP); 747 } 748 749 static struct nd_prefix * 750 prefix_lookup(pr) 751 struct nd_prefix *pr; 752 { 753 struct nd_prefix *search; 754 755 for (search = nd_prefix.lh_first; search; search = search->ndpr_next) { 756 if (pr->ndpr_ifp == search->ndpr_ifp && 757 pr->ndpr_plen == search->ndpr_plen && 758 in6_are_prefix_equal(&pr->ndpr_prefix.sin6_addr, 759 &search->ndpr_prefix.sin6_addr, 760 pr->ndpr_plen) 761 ) { 762 break; 763 } 764 } 765 766 return(search); 767 } 768 769 static int 770 prelist_add(pr, dr) 771 struct nd_prefix *pr; 772 struct nd_defrouter *dr; 773 { 774 struct nd_prefix *new; 775 int i, s; 776 777 new = (struct nd_prefix *)malloc(sizeof(*new), M_IP6NDP, M_NOWAIT); 778 if (new == NULL) 779 return ENOMEM; 780 bzero(new, sizeof(*new)); 781 *new = *pr; 782 783 /* initilization */ 784 new->ndpr_statef_onlink = pr->ndpr_statef_onlink; 785 LIST_INIT(&new->ndpr_advrtrs); 786 in6_prefixlen2mask(&new->ndpr_mask, new->ndpr_plen); 787 /* make prefix in the canonical form */ 788 for (i = 0; i < 4; i++) 789 new->ndpr_prefix.sin6_addr.s6_addr32[i] &= 790 new->ndpr_mask.s6_addr32[i]; 791 792 /* xxx ND_OPT_PI_FLAG_ONLINK processing */ 793 794 s = splsoftnet(); 795 /* link ndpr_entry to nd_prefix list */ 796 LIST_INSERT_HEAD(&nd_prefix, new, ndpr_entry); 797 splx(s); 798 799 if (dr) 800 pfxrtr_add(new, dr); 801 802 return 0; 803 } 804 805 void 806 prelist_remove(pr) 807 struct nd_prefix *pr; 808 { 809 struct nd_pfxrouter *pfr, *next; 810 int s; 811 812 s = splsoftnet(); 813 /* unlink ndpr_entry from nd_prefix list */ 814 LIST_REMOVE(pr, ndpr_entry); 815 816 /* free list of routers that adversed the prefix */ 817 for (pfr = pr->ndpr_advrtrs.lh_first; pfr; pfr = next) { 818 next = pfr->pfr_next; 819 820 free(pfr, M_IP6NDP); 821 } 822 splx(s); 823 824 free(pr, M_IP6NDP); 825 826 pfxlist_onlink_check(); 827 } 828 829 /* 830 * NOTE: We set address lifetime to keep 831 * address lifetime <= prefix lifetime 832 * invariant. This is to simplify on-link determination code. 833 * If onlink determination is udated, this routine may have to be updated too. 834 */ 835 int 836 prelist_update(new, dr, m) 837 struct nd_prefix *new; 838 struct nd_defrouter *dr; /* may be NULL */ 839 struct mbuf *m; 840 { 841 struct in6_ifaddr *ia6 = NULL; 842 struct nd_prefix *pr; 843 int s = splsoftnet(); 844 int error = 0; 845 int auth; 846 struct in6_addrlifetime *lt6; 847 848 auth = 0; 849 if (m) { 850 /* 851 * Authenticity for NA consists authentication for 852 * both IP header and IP datagrams, doesn't it ? 853 */ 854 #if defined(M_AUTHIPHDR) && defined(M_AUTHIPDGM) 855 auth = (m->m_flags & M_AUTHIPHDR 856 && m->m_flags & M_AUTHIPDGM) ? 1 : 0; 857 #endif 858 } 859 860 if ((pr = prefix_lookup(new)) != NULL) { 861 if (pr->ndpr_ifp != new->ndpr_ifp) { 862 error = EADDRNOTAVAIL; 863 goto end; 864 } 865 /* update prefix information */ 866 pr->ndpr_flags = new->ndpr_flags; 867 pr->ndpr_vltime = new->ndpr_vltime; 868 pr->ndpr_pltime = new->ndpr_pltime; 869 pr->ndpr_preferred = new->ndpr_preferred; 870 pr->ndpr_expire = new->ndpr_expire; 871 872 /* 873 * RFC 2462 5.5.3 (d) or (e) 874 * We got a prefix which we have seen in the past. 875 */ 876 if (!new->ndpr_raf_auto) 877 goto noautoconf1; 878 879 if (IN6_IS_ADDR_UNSPECIFIED(&pr->ndpr_addr)) 880 ia6 = NULL; 881 else 882 ia6 = in6ifa_ifpwithaddr(pr->ndpr_ifp, &pr->ndpr_addr); 883 884 if (ia6 == NULL) { 885 /* 886 * Special case: 887 * (1) We have seen the prefix advertised before, but 888 * we have never performed autoconfig for this prefix. 889 * This is because Autonomous bit was 0 previously, or 890 * autoconfig failed due to some other reasons. 891 * (2) We have seen the prefix advertised before and 892 * we have performed autoconfig in the past, but 893 * we seem to have no interface address right now. 894 * This is because the interface address have expired. 895 * 896 * This prefix is fresh, with respect to autoconfig 897 * process. 898 * 899 * Add an address based on RFC 2462 5.5.3 (d). 900 */ 901 ia6 = in6_ifadd(pr->ndpr_ifp, 902 &pr->ndpr_prefix.sin6_addr, &pr->ndpr_addr, 903 new->ndpr_plen); 904 if (!ia6) { 905 error = EADDRNOTAVAIL; 906 nd6log((LOG_ERR, 907 "prelist_update: failed to add a " 908 "new address\n")); 909 goto noautoconf1; 910 } 911 912 lt6 = &ia6->ia6_lifetime; 913 914 /* address lifetime <= prefix lifetime */ 915 lt6->ia6t_vltime = new->ndpr_vltime; 916 lt6->ia6t_pltime = new->ndpr_pltime; 917 in6_init_address_ltimes(new, lt6, 1); 918 } else { 919 #define TWOHOUR (120*60) 920 /* 921 * We have seen the prefix before, and we have added 922 * interface address in the past. We still have 923 * the interface address assigned. 924 * 925 * update address lifetime based on RFC 2462 926 * 5.5.3 (e). 927 */ 928 int update = 0; 929 930 lt6 = &ia6->ia6_lifetime; 931 932 #if 0 /* RFC 2462 5.5.3 (e) */ 933 lt6->ia6t_pltime = new->ndpr_pltime; 934 if (TWOHOUR < new->ndpr_vltime 935 || lt6pr->nd < new->ndpr_vltime) { 936 lt6->ia6t_vltime = new->ndpr_vltime; 937 update++; 938 } else if (auth 939 && lt6->ia6t_vltime <= TWOHOUR0 940 && new->ndpr_vltime <= lt6->ia6t_vltime) { 941 lt6->ia6t_vltime = new->ndpr_vltime; 942 update++; 943 } else { 944 lt6->ia6t_vltime = TWOHOUR; 945 update++; 946 } 947 948 /* 2 hour rule is not imposed for pref lifetime */ 949 new->ndpr_apltime = new->ndpr_pltime; 950 lt6->ia6t_pltime = new->ndpr_pltime; 951 #else /* update from Jim Bound, (ipng 6712) */ 952 if (TWOHOUR < new->ndpr_vltime 953 || lt6->ia6t_vltime < new->ndpr_vltime) { 954 lt6->ia6t_vltime = new->ndpr_vltime; 955 update++; 956 } else if (auth) { 957 lt6->ia6t_vltime = new->ndpr_vltime; 958 update++; 959 } 960 961 /* jim bound rule is not imposed for pref lifetime */ 962 lt6->ia6t_pltime = new->ndpr_pltime; 963 #endif 964 in6_init_address_ltimes(new, lt6, update); 965 } 966 967 noautoconf1: 968 969 #if 0 970 /* address lifetime expire processing, RFC 2462 5.5.4. */ 971 if (pr->ndpr_preferred && pr->ndpr_preferred < time_second) { 972 struct in6_ifaddr *ia6; 973 974 ia6 = in6ifa_ifpwithaddr(pr->ndpr_ifp, &pr->ndpr_addr); 975 if (ia6) 976 ia6->ia6_flags &= ~IN6_IFF_DEPRECATED; 977 } 978 #endif 979 980 if (dr && pfxrtr_lookup(pr, dr) == NULL) 981 pfxrtr_add(pr, dr); 982 } else { 983 int error_tmp; 984 985 if (new->ndpr_vltime == 0) goto end; 986 987 bzero(&new->ndpr_addr, sizeof(struct in6_addr)); 988 989 /* 990 * RFC 2462 5.5.3 (d) 991 * We got a fresh prefix. Perform some sanity checks 992 * and add an interface address by appending interface ID 993 * to the advertised prefix. 994 */ 995 if (!new->ndpr_raf_auto) 996 goto noautoconf2; 997 998 ia6 = in6_ifadd(new->ndpr_ifp, &new->ndpr_prefix.sin6_addr, 999 &new->ndpr_addr, new->ndpr_plen); 1000 if (!ia6) { 1001 error = EADDRNOTAVAIL; 1002 nd6log((LOG_ERR, "prelist_update: " 1003 "failed to add a new address\n")); 1004 goto noautoconf2; 1005 } 1006 /* set onlink bit if an interface route is configured */ 1007 new->ndpr_statef_onlink = (ia6->ia_flags & IFA_ROUTE) ? 1 : 0; 1008 1009 lt6 = &ia6->ia6_lifetime; 1010 1011 /* address lifetime <= prefix lifetime */ 1012 lt6->ia6t_vltime = new->ndpr_vltime; 1013 lt6->ia6t_pltime = new->ndpr_pltime; 1014 in6_init_address_ltimes(new, lt6, 1); 1015 1016 noautoconf2: 1017 error_tmp = prelist_add(new, dr); 1018 error = error_tmp ? error_tmp : error; 1019 } 1020 1021 end: 1022 splx(s); 1023 return error; 1024 } 1025 1026 /* 1027 * A supplement function used in the on-link detection below; 1028 * detect if a given prefix has a (probably) reachable advertising router. 1029 * XXX: lengthy function name... 1030 */ 1031 static struct nd_pfxrouter * 1032 find_pfxlist_reachable_router(pr) 1033 struct nd_prefix *pr; 1034 { 1035 struct nd_pfxrouter *pfxrtr; 1036 struct rtentry *rt; 1037 struct llinfo_nd6 *ln; 1038 1039 for (pfxrtr = LIST_FIRST(&pr->ndpr_advrtrs); pfxrtr; 1040 pfxrtr = LIST_NEXT(pfxrtr, pfr_entry)) { 1041 if ((rt = nd6_lookup(&pfxrtr->router->rtaddr, 0, 1042 pfxrtr->router->ifp)) && 1043 (ln = (struct llinfo_nd6 *)rt->rt_llinfo) && 1044 ND6_IS_LLINFO_PROBREACH(ln)) 1045 break; /* found */ 1046 } 1047 1048 return(pfxrtr); 1049 1050 } 1051 1052 /* 1053 * Check if each prefix in the prefix list has at least one available router 1054 * that advertised the prefix (a router is "available" if its neighbor cache 1055 * entry is reachable or probably reachable). 1056 * If the check fails, the prefix may be off-link, because, for example, 1057 * we have moved from the network but the lifetime of the prefix has not 1058 * expired yet. So we should not use the prefix if there is another prefix 1059 * that has an available router. 1060 * But, if there is no prefix that has an available router, we still regards 1061 * all the prefixes as on-link. This is because we can't tell if all the 1062 * routers are simply dead or if we really moved from the network and there 1063 * is no router around us. 1064 */ 1065 void 1066 pfxlist_onlink_check() 1067 { 1068 struct nd_prefix *pr; 1069 1070 /* 1071 * Check if there is a prefix that has a reachable advertising 1072 * router. 1073 */ 1074 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 1075 if (find_pfxlist_reachable_router(pr)) 1076 break; 1077 } 1078 1079 if (pr) { 1080 /* 1081 * There is at least one prefix that has a reachable router. 1082 * First, detach prefixes which has no reachable advertising 1083 * router and then attach other prefixes. 1084 * The order is important since an attached prefix and a 1085 * detached prefix may have a same interface route. 1086 */ 1087 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 1088 if (find_pfxlist_reachable_router(pr) == NULL && 1089 pr->ndpr_statef_onlink) { 1090 pr->ndpr_statef_onlink = 0; 1091 nd6_detach_prefix(pr); 1092 } 1093 } 1094 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 1095 if (find_pfxlist_reachable_router(pr) && 1096 pr->ndpr_statef_onlink == 0) 1097 nd6_attach_prefix(pr); 1098 } 1099 } 1100 else { 1101 /* there is no prefix that has a reachable router */ 1102 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) 1103 if (pr->ndpr_statef_onlink == 0) 1104 nd6_attach_prefix(pr); 1105 } 1106 } 1107 1108 static void 1109 nd6_detach_prefix(pr) 1110 struct nd_prefix *pr; 1111 { 1112 struct in6_ifaddr *ia6; 1113 struct sockaddr_in6 sa6, mask6; 1114 1115 /* 1116 * Delete the interface route associated with the prefix. 1117 */ 1118 bzero(&sa6, sizeof(sa6)); 1119 sa6.sin6_family = AF_INET6; 1120 sa6.sin6_len = sizeof(sa6); 1121 bcopy(&pr->ndpr_prefix.sin6_addr, &sa6.sin6_addr, 1122 sizeof(struct in6_addr)); 1123 bzero(&mask6, sizeof(mask6)); 1124 mask6.sin6_family = AF_INET6; 1125 mask6.sin6_len = sizeof(sa6); 1126 bcopy(&pr->ndpr_mask, &mask6.sin6_addr, sizeof(struct in6_addr)); 1127 { 1128 int e; 1129 1130 e = rtrequest(RTM_DELETE, (struct sockaddr *)&sa6, NULL, 1131 (struct sockaddr *)&mask6, 0, NULL); 1132 if (e) { 1133 nd6log((LOG_ERR, 1134 "nd6_detach_prefix: failed to delete route: " 1135 "%s/%d (errno = %d)\n", 1136 ip6_sprintf(&sa6.sin6_addr), 1137 pr->ndpr_plen, 1138 e)); 1139 } 1140 } 1141 1142 /* 1143 * Mark the address derived from the prefix detached so that 1144 * it won't be used as a source address for a new connection. 1145 */ 1146 if (IN6_IS_ADDR_UNSPECIFIED(&pr->ndpr_addr)) 1147 ia6 = NULL; 1148 else 1149 ia6 = in6ifa_ifpwithaddr(pr->ndpr_ifp, &pr->ndpr_addr); 1150 if (ia6) 1151 ia6->ia6_flags |= IN6_IFF_DETACHED; 1152 } 1153 1154 static void 1155 nd6_attach_prefix(pr) 1156 struct nd_prefix *pr; 1157 { 1158 struct ifaddr *ifa; 1159 struct in6_ifaddr *ia6; 1160 1161 /* 1162 * Add the interface route associated with the prefix(if necessary) 1163 * Should we consider if the L bit is set in pr->ndpr_flags? 1164 */ 1165 ifa = ifaof_ifpforaddr((struct sockaddr *)&pr->ndpr_prefix, 1166 pr->ndpr_ifp); 1167 if (ifa == NULL) { 1168 nd6log((LOG_ERR, 1169 "nd6_attach_prefix: failed to find any ifaddr" 1170 " to add route for a prefix(%s/%d)\n", 1171 ip6_sprintf(&pr->ndpr_addr), pr->ndpr_plen)); 1172 } 1173 else { 1174 int e; 1175 struct sockaddr_in6 mask6; 1176 1177 bzero(&mask6, sizeof(mask6)); 1178 mask6.sin6_family = AF_INET6; 1179 mask6.sin6_len = sizeof(mask6); 1180 mask6.sin6_addr = pr->ndpr_mask; 1181 e = rtrequest(RTM_ADD, (struct sockaddr *)&pr->ndpr_prefix, 1182 ifa->ifa_addr, (struct sockaddr *)&mask6, 1183 ifa->ifa_flags, NULL); 1184 if (e == 0) 1185 pr->ndpr_statef_onlink = 1; 1186 else { 1187 nd6log((LOG_DEBUG, 1188 "nd6_attach_prefix: failed to add route for" 1189 " a prefix(%s/%d), errno = %d\n", 1190 ip6_sprintf(&pr->ndpr_addr), pr->ndpr_plen, e)); 1191 } 1192 } 1193 1194 /* 1195 * Now the address derived from the prefix can be used as a source 1196 * for a new connection, so clear the detached flag. 1197 */ 1198 if (IN6_IS_ADDR_UNSPECIFIED(&pr->ndpr_addr)) 1199 ia6 = NULL; 1200 else 1201 ia6 = in6ifa_ifpwithaddr(pr->ndpr_ifp, &pr->ndpr_addr); 1202 if (ia6) { 1203 ia6->ia6_flags &= ~IN6_IFF_DETACHED; 1204 if (pr->ndpr_statef_onlink) 1205 ia6->ia_flags |= IFA_ROUTE; 1206 } 1207 } 1208 1209 static struct in6_ifaddr * 1210 in6_ifadd(ifp, in6, addr, prefixlen) 1211 struct ifnet *ifp; 1212 struct in6_addr *in6; 1213 struct in6_addr *addr; 1214 int prefixlen; /* prefix len of the new prefix in "in6" */ 1215 { 1216 struct ifaddr *ifa; 1217 struct in6_ifaddr *ia, *ib, *oia; 1218 int s, error; 1219 struct in6_addr mask; 1220 1221 in6_len2mask(&mask, prefixlen); 1222 1223 /* find link-local address (will be interface ID) */ 1224 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 0);/* 0 is OK? */ 1225 if (ifa) 1226 ib = (struct in6_ifaddr *)ifa; 1227 else 1228 return NULL; 1229 1230 #if 0 /* don't care link local addr state, and always do DAD */ 1231 /* if link-local address is not eligible, do not autoconfigure. */ 1232 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY) { 1233 printf("in6_ifadd: link-local address not ready\n"); 1234 return NULL; 1235 } 1236 #endif 1237 1238 /* prefixlen + ifidlen must be equal to 128 */ 1239 if (prefixlen != in6_mask2len(&ib->ia_prefixmask.sin6_addr)) { 1240 nd6log((LOG_ERR, "in6_ifadd: wrong prefixlen for %s" 1241 "(prefix=%d ifid=%d)\n", if_name(ifp), 1242 prefixlen, 1243 128 - in6_mask2len(&ib->ia_prefixmask.sin6_addr))); 1244 return NULL; 1245 } 1246 1247 /* make ifaddr */ 1248 ia = (struct in6_ifaddr *)malloc(sizeof(*ia), M_IFADDR, M_DONTWAIT); 1249 if (ia == NULL) { 1250 printf("ENOBUFS in in6_ifadd %d\n", __LINE__); 1251 return NULL; 1252 } 1253 1254 bzero((caddr_t)ia, sizeof(*ia)); 1255 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 1256 if (ifp->if_flags & IFF_POINTOPOINT) 1257 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 1258 else 1259 ia->ia_ifa.ifa_dstaddr = NULL; 1260 ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask; 1261 ia->ia_ifp = ifp; 1262 1263 /* link to in6_ifaddr */ 1264 if ((oia = in6_ifaddr) != NULL) { 1265 for( ; oia->ia_next; oia = oia->ia_next) 1266 continue; 1267 oia->ia_next = ia; 1268 } else { 1269 /* 1270 * This should be impossible, since we have at least one 1271 * link-local address (see the beginning of this function). 1272 * XXX: should we rather panic here? 1273 */ 1274 printf("in6_ifadd: in6_ifaddr is NULL (impossible!)\n"); 1275 in6_ifaddr = ia; 1276 } 1277 /* gain a refcnt for the link from in6_ifaddr */ 1278 IFAREF((struct ifaddr *)ia); 1279 1280 /* link to if_addrlist */ 1281 TAILQ_INSERT_TAIL(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list); 1282 /* gain another refcnt for the link from if_addrlist */ 1283 IFAREF((struct ifaddr *)ia); 1284 1285 /* new address */ 1286 ia->ia_addr.sin6_len = sizeof(struct sockaddr_in6); 1287 ia->ia_addr.sin6_family = AF_INET6; 1288 /* prefix */ 1289 bcopy(in6, &ia->ia_addr.sin6_addr, sizeof(ia->ia_addr.sin6_addr)); 1290 ia->ia_addr.sin6_addr.s6_addr32[0] &= mask.s6_addr32[0]; 1291 ia->ia_addr.sin6_addr.s6_addr32[1] &= mask.s6_addr32[1]; 1292 ia->ia_addr.sin6_addr.s6_addr32[2] &= mask.s6_addr32[2]; 1293 ia->ia_addr.sin6_addr.s6_addr32[3] &= mask.s6_addr32[3]; 1294 /* interface ID */ 1295 ia->ia_addr.sin6_addr.s6_addr32[0] 1296 |= (ib->ia_addr.sin6_addr.s6_addr32[0] & ~mask.s6_addr32[0]); 1297 ia->ia_addr.sin6_addr.s6_addr32[1] 1298 |= (ib->ia_addr.sin6_addr.s6_addr32[1] & ~mask.s6_addr32[1]); 1299 ia->ia_addr.sin6_addr.s6_addr32[2] 1300 |= (ib->ia_addr.sin6_addr.s6_addr32[2] & ~mask.s6_addr32[2]); 1301 ia->ia_addr.sin6_addr.s6_addr32[3] 1302 |= (ib->ia_addr.sin6_addr.s6_addr32[3] & ~mask.s6_addr32[3]); 1303 1304 /* new prefix */ 1305 ia->ia_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 1306 ia->ia_prefixmask.sin6_family = AF_INET6; 1307 bcopy(&mask, &ia->ia_prefixmask.sin6_addr, 1308 sizeof(ia->ia_prefixmask.sin6_addr)); 1309 1310 /* same routine */ 1311 ia->ia_ifa.ifa_rtrequest = 1312 (ifp->if_type == IFT_PPP) ? nd6_p2p_rtrequest : nd6_rtrequest; 1313 ia->ia_ifa.ifa_flags |= RTF_CLONING; 1314 ia->ia_ifa.ifa_metric = ifp->if_metric; 1315 1316 /* add interface route */ 1317 if ((error = rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_UP|RTF_CLONING))) { 1318 nd6log((LOG_NOTICE, 1319 "in6_ifadd: failed to add an interface route " 1320 "for %s/%d on %s, errno = %d\n", 1321 ip6_sprintf(&ia->ia_addr.sin6_addr), prefixlen, 1322 if_name(ifp), error)); 1323 } 1324 else 1325 ia->ia_flags |= IFA_ROUTE; 1326 1327 *addr = ia->ia_addr.sin6_addr; 1328 1329 if (ifp->if_flags & IFF_MULTICAST) { 1330 int error; /* not used */ 1331 struct in6_addr sol6; 1332 1333 /* Restore saved multicast addresses(if any). */ 1334 in6_restoremkludge(ia, ifp); 1335 1336 /* join solicited node multicast address */ 1337 bzero(&sol6, sizeof(sol6)); 1338 sol6.s6_addr16[0] = htons(0xff02); 1339 sol6.s6_addr16[1] = htons(ifp->if_index); 1340 sol6.s6_addr32[1] = 0; 1341 sol6.s6_addr32[2] = htonl(1); 1342 sol6.s6_addr32[3] = ia->ia_addr.sin6_addr.s6_addr32[3]; 1343 sol6.s6_addr8[12] = 0xff; 1344 if (!in6_addmulti(&sol6, ifp, &error)) { 1345 nd6log((LOG_ERR, "%s: failed to join %s (errno=%d)\n", 1346 if_name(ifp), ip6_sprintf(&sol6), error)); 1347 } 1348 } 1349 1350 ia->ia6_flags |= IN6_IFF_TENTATIVE; 1351 1352 /* 1353 * To make the interface up. Only AF_INET6 in ia is used... 1354 */ 1355 s = splnet(); 1356 if (ifp->if_ioctl && (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia)) { 1357 splx(s); 1358 return NULL; 1359 } 1360 splx(s); 1361 1362 /* Perform DAD, if needed. */ 1363 nd6_dad_start((struct ifaddr *)ia, NULL); 1364 1365 return ia; 1366 } 1367 1368 int 1369 in6_ifdel(ifp, in6) 1370 struct ifnet *ifp; 1371 struct in6_addr *in6; 1372 { 1373 struct in6_ifaddr *ia = (struct in6_ifaddr *)NULL; 1374 struct in6_ifaddr *oia = (struct in6_ifaddr *)NULL; 1375 1376 if (!ifp) 1377 return -1; 1378 1379 ia = in6ifa_ifpwithaddr(ifp, in6); 1380 if (!ia) 1381 return -1; 1382 1383 if (ifp->if_flags & IFF_MULTICAST) { 1384 /* 1385 * delete solicited multicast addr for deleting host id 1386 */ 1387 struct in6_multi *in6m; 1388 struct in6_addr llsol; 1389 bzero(&llsol, sizeof(struct in6_addr)); 1390 llsol.s6_addr16[0] = htons(0xff02); 1391 llsol.s6_addr16[1] = htons(ifp->if_index); 1392 llsol.s6_addr32[1] = 0; 1393 llsol.s6_addr32[2] = htonl(1); 1394 llsol.s6_addr32[3] = 1395 ia->ia_addr.sin6_addr.s6_addr32[3]; 1396 llsol.s6_addr8[12] = 0xff; 1397 1398 IN6_LOOKUP_MULTI(llsol, ifp, in6m); 1399 if (in6m) 1400 in6_delmulti(in6m); 1401 } 1402 1403 if (ia->ia_flags & IFA_ROUTE) { 1404 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, 0); 1405 ia->ia_flags &= ~IFA_ROUTE; 1406 } 1407 1408 TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list); 1409 IFAFREE(&ia->ia_ifa); 1410 1411 /* lladdr is never deleted */ 1412 oia = ia; 1413 if (oia == (ia = in6_ifaddr)) 1414 in6_ifaddr = ia->ia_next; 1415 else { 1416 while (ia->ia_next && (ia->ia_next != oia)) 1417 ia = ia->ia_next; 1418 if (ia->ia_next) 1419 ia->ia_next = oia->ia_next; 1420 else 1421 return -1; 1422 } 1423 1424 in6_savemkludge(oia); 1425 IFAFREE((&oia->ia_ifa)); 1426 /* xxx 1427 rtrequest(RTM_DELETE, 1428 (struct sockaddr *)&ia->ia_addr, 1429 (struct sockaddr *)0 1430 (struct sockaddr *)&ia->ia_prefixmask, 1431 RTF_UP|RTF_CLONING, 1432 (struct rtentry **)0); 1433 */ 1434 return 0; 1435 } 1436 1437 int 1438 in6_init_prefix_ltimes(struct nd_prefix *ndpr) 1439 { 1440 long time_second = time.tv_sec; 1441 1442 /* check if preferred lifetime > valid lifetime. RFC2462 5.5.3 (c) */ 1443 if (ndpr->ndpr_pltime > ndpr->ndpr_vltime) { 1444 nd6log((LOG_INFO, "in6_init_prefix_ltimes: preferred lifetime" 1445 "(%d) is greater than valid lifetime(%d)\n", 1446 (u_int)ndpr->ndpr_pltime, (u_int)ndpr->ndpr_vltime)); 1447 return (EINVAL); 1448 } 1449 if (ndpr->ndpr_pltime == ND6_INFINITE_LIFETIME) 1450 ndpr->ndpr_preferred = 0; 1451 else 1452 ndpr->ndpr_preferred = time_second + ndpr->ndpr_pltime; 1453 if (ndpr->ndpr_vltime == ND6_INFINITE_LIFETIME) 1454 ndpr->ndpr_expire = 0; 1455 else 1456 ndpr->ndpr_expire = time_second + ndpr->ndpr_vltime; 1457 1458 return 0; 1459 } 1460 1461 static void 1462 in6_init_address_ltimes(struct nd_prefix *new, 1463 struct in6_addrlifetime *lt6, 1464 int update_vltime) 1465 { 1466 long time_second = time.tv_sec; 1467 1468 /* Valid lifetime must not be updated unless explicitly specified. */ 1469 if (update_vltime) { 1470 /* init ia6t_expire */ 1471 if (lt6->ia6t_vltime == ND6_INFINITE_LIFETIME) 1472 lt6->ia6t_expire = 0; 1473 else { 1474 lt6->ia6t_expire = time_second; 1475 lt6->ia6t_expire += lt6->ia6t_vltime; 1476 } 1477 /* Ensure addr lifetime <= prefix lifetime. */ 1478 if (new->ndpr_expire && lt6->ia6t_expire && 1479 new->ndpr_expire < lt6->ia6t_expire) 1480 lt6->ia6t_expire = new->ndpr_expire; 1481 } 1482 1483 /* init ia6t_preferred */ 1484 if (lt6->ia6t_pltime == ND6_INFINITE_LIFETIME) 1485 lt6->ia6t_preferred = 0; 1486 else { 1487 lt6->ia6t_preferred = time_second; 1488 lt6->ia6t_preferred += lt6->ia6t_pltime; 1489 } 1490 /* Ensure addr lifetime <= prefix lifetime. */ 1491 if (new->ndpr_preferred && lt6->ia6t_preferred 1492 && new->ndpr_preferred < lt6->ia6t_preferred) 1493 lt6->ia6t_preferred = new->ndpr_preferred; 1494 } 1495 1496 /* 1497 * Delete all the routing table entries that use the specified gateway. 1498 * XXX: this function causes search through all entries of routing table, so 1499 * it shouldn't be called when acting as a router. 1500 */ 1501 void 1502 rt6_flush(gateway, ifp) 1503 struct in6_addr *gateway; 1504 struct ifnet *ifp; 1505 { 1506 struct radix_node_head *rnh = rt_tables[AF_INET6]; 1507 int s = splsoftnet(); 1508 1509 /* We'll care only link-local addresses */ 1510 if (!IN6_IS_ADDR_LINKLOCAL(gateway)) { 1511 splx(s); 1512 return; 1513 } 1514 /* XXX: hack for KAME's link-local address kludge */ 1515 gateway->s6_addr16[1] = htons(ifp->if_index); 1516 1517 rnh->rnh_walktree(rnh, rt6_deleteroute, (void *)gateway); 1518 splx(s); 1519 } 1520 1521 static int 1522 rt6_deleteroute(rn, arg) 1523 struct radix_node *rn; 1524 void *arg; 1525 { 1526 #define SIN6(s) ((struct sockaddr_in6 *)s) 1527 struct rtentry *rt = (struct rtentry *)rn; 1528 struct in6_addr *gate = (struct in6_addr *)arg; 1529 1530 if (rt->rt_gateway == NULL || rt->rt_gateway->sa_family != AF_INET6) 1531 return(0); 1532 1533 if (!IN6_ARE_ADDR_EQUAL(gate, &SIN6(rt->rt_gateway)->sin6_addr)) 1534 return(0); 1535 1536 /* 1537 * Do not delete a static route. 1538 * XXX: this seems to be a bit ad-hoc. Should we consider the 1539 * 'cloned' bit instead? 1540 */ 1541 if ((rt->rt_flags & RTF_STATIC) != 0) 1542 return(0); 1543 1544 /* 1545 * We delete only host route. This means, in particular, we don't 1546 * delete default route. 1547 */ 1548 if ((rt->rt_flags & RTF_HOST) == 0) 1549 return(0); 1550 1551 return(rtrequest(RTM_DELETE, rt_key(rt), 1552 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0)); 1553 #undef SIN6 1554 } 1555 1556 int 1557 nd6_setdefaultiface(ifindex) 1558 int ifindex; 1559 { 1560 int error = 0; 1561 1562 if (ifindex < 0 || if_index < ifindex) 1563 return(EINVAL); 1564 1565 if (nd6_defifindex != ifindex) { 1566 nd6_defifindex = ifindex; 1567 if (nd6_defifindex > 0) { 1568 nd6_defifp = ifindex2ifnet[nd6_defifindex]; 1569 } else 1570 nd6_defifp = NULL; 1571 1572 /* 1573 * If the Default Router List is empty, install a route 1574 * to the specified interface as default or remove the default 1575 * route when the default interface becomes canceled. 1576 * The check for the queue is actually redundant, but 1577 * we do this here to avoid re-install the default route 1578 * if the list is NOT empty. 1579 */ 1580 if (TAILQ_FIRST(&nd_defrouter) == NULL) 1581 defrouter_select(); 1582 } 1583 1584 return(error); 1585 } 1586