1 /* $FreeBSD: src/sys/netinet6/nd6.c,v 1.2.2.15 2003/05/06 06:46:58 suz Exp $ */ 2 /* $DragonFly: src/sys/netinet6/nd6.c,v 1.3 2003/07/27 01:49:52 hmp Exp $ */ 3 /* $KAME: nd6.c,v 1.144 2001/05/24 07:44:00 itojun Exp $ */ 4 5 /* 6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the project nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 /* 35 * XXX 36 * KAME 970409 note: 37 * BSD/OS version heavily modifies this code, related to llinfo. 38 * Since we don't have BSD/OS version of net/route.c in our hand, 39 * I left the code mostly as it was in 970310. -- itojun 40 */ 41 42 #include "opt_inet.h" 43 #include "opt_inet6.h" 44 45 #include <sys/param.h> 46 #include <sys/systm.h> 47 #include <sys/callout.h> 48 #include <sys/malloc.h> 49 #include <sys/mbuf.h> 50 #include <sys/socket.h> 51 #include <sys/sockio.h> 52 #include <sys/time.h> 53 #include <sys/kernel.h> 54 #include <sys/protosw.h> 55 #include <sys/errno.h> 56 #include <sys/syslog.h> 57 #include <sys/queue.h> 58 #include <sys/sysctl.h> 59 60 #include <net/if.h> 61 #include <net/if_dl.h> 62 #include <net/if_types.h> 63 #include <net/if_atm.h> 64 #include <net/route.h> 65 66 #include <netinet/in.h> 67 #include <netinet/if_ether.h> 68 #include <netinet/if_fddi.h> 69 #include <netinet6/in6_var.h> 70 #include <netinet/ip6.h> 71 #include <netinet6/ip6_var.h> 72 #include <netinet6/nd6.h> 73 #include <netinet6/in6_prefix.h> 74 #include <netinet/icmp6.h> 75 76 #include "loop.h" 77 78 #include <net/net_osdep.h> 79 80 #define ND6_SLOWTIMER_INTERVAL (60 * 60) /* 1 hour */ 81 #define ND6_RECALC_REACHTM_INTERVAL (60 * 120) /* 2 hours */ 82 83 #define SIN6(s) ((struct sockaddr_in6 *)s) 84 #define SDL(s) ((struct sockaddr_dl *)s) 85 86 /* timer values */ 87 int nd6_prune = 1; /* walk list every 1 seconds */ 88 int nd6_delay = 5; /* delay first probe time 5 second */ 89 int nd6_umaxtries = 3; /* maximum unicast query */ 90 int nd6_mmaxtries = 3; /* maximum multicast query */ 91 int nd6_useloopback = 1; /* use loopback interface for local traffic */ 92 int nd6_gctimer = (60 * 60 * 24); /* 1 day: garbage collection timer */ 93 94 /* preventing too many loops in ND option parsing */ 95 int nd6_maxndopt = 10; /* max # of ND options allowed */ 96 97 int nd6_maxnudhint = 0; /* max # of subsequent upper layer hints */ 98 99 #ifdef ND6_DEBUG 100 int nd6_debug = 1; 101 #else 102 int nd6_debug = 0; 103 #endif 104 105 /* for debugging? */ 106 static int nd6_inuse, nd6_allocated; 107 108 struct llinfo_nd6 llinfo_nd6 = {&llinfo_nd6, &llinfo_nd6}; 109 static size_t nd_ifinfo_indexlim = 8; 110 struct nd_ifinfo *nd_ifinfo = NULL; 111 struct nd_drhead nd_defrouter; 112 struct nd_prhead nd_prefix = { 0 }; 113 114 int nd6_recalc_reachtm_interval = ND6_RECALC_REACHTM_INTERVAL; 115 static struct sockaddr_in6 all1_sa; 116 117 static void nd6_slowtimo __P((void *)); 118 static int regen_tmpaddr __P((struct in6_ifaddr *)); 119 120 struct callout nd6_slowtimo_ch; 121 struct callout nd6_timer_ch; 122 extern struct callout in6_tmpaddrtimer_ch; 123 124 void 125 nd6_init() 126 { 127 static int nd6_init_done = 0; 128 int i; 129 130 if (nd6_init_done) { 131 log(LOG_NOTICE, "nd6_init called more than once(ignored)\n"); 132 return; 133 } 134 135 all1_sa.sin6_family = AF_INET6; 136 all1_sa.sin6_len = sizeof(struct sockaddr_in6); 137 for (i = 0; i < sizeof(all1_sa.sin6_addr); i++) 138 all1_sa.sin6_addr.s6_addr[i] = 0xff; 139 140 /* initialization of the default router list */ 141 TAILQ_INIT(&nd_defrouter); 142 143 nd6_init_done = 1; 144 145 /* start timer */ 146 callout_reset(&nd6_slowtimo_ch, ND6_SLOWTIMER_INTERVAL * hz, 147 nd6_slowtimo, NULL); 148 } 149 150 void 151 nd6_ifattach(ifp) 152 struct ifnet *ifp; 153 { 154 155 /* 156 * We have some arrays that should be indexed by if_index. 157 * since if_index will grow dynamically, they should grow too. 158 */ 159 if (nd_ifinfo == NULL || if_index >= nd_ifinfo_indexlim) { 160 size_t n; 161 caddr_t q; 162 163 while (if_index >= nd_ifinfo_indexlim) 164 nd_ifinfo_indexlim <<= 1; 165 166 /* grow nd_ifinfo */ 167 n = nd_ifinfo_indexlim * sizeof(struct nd_ifinfo); 168 q = (caddr_t)malloc(n, M_IP6NDP, M_WAITOK); 169 bzero(q, n); 170 if (nd_ifinfo) { 171 bcopy((caddr_t)nd_ifinfo, q, n/2); 172 free((caddr_t)nd_ifinfo, M_IP6NDP); 173 } 174 nd_ifinfo = (struct nd_ifinfo *)q; 175 } 176 177 #define ND nd_ifinfo[ifp->if_index] 178 179 /* 180 * Don't initialize if called twice. 181 * XXX: to detect this, we should choose a member that is never set 182 * before initialization of the ND structure itself. We formaly used 183 * the linkmtu member, which was not suitable because it could be 184 * initialized via "ifconfig mtu". 185 */ 186 if (ND.basereachable) 187 return; 188 189 ND.linkmtu = ifindex2ifnet[ifp->if_index]->if_mtu; 190 ND.chlim = IPV6_DEFHLIM; 191 ND.basereachable = REACHABLE_TIME; 192 ND.reachable = ND_COMPUTE_RTIME(ND.basereachable); 193 ND.retrans = RETRANS_TIMER; 194 ND.receivedra = 0; 195 ND.flags = ND6_IFF_PERFORMNUD; 196 nd6_setmtu(ifp); 197 #undef ND 198 } 199 200 /* 201 * Reset ND level link MTU. This function is called when the physical MTU 202 * changes, which means we might have to adjust the ND level MTU. 203 */ 204 void 205 nd6_setmtu(ifp) 206 struct ifnet *ifp; 207 { 208 struct nd_ifinfo *ndi = &nd_ifinfo[ifp->if_index]; 209 u_long oldmaxmtu = ndi->maxmtu; 210 u_long oldlinkmtu = ndi->linkmtu; 211 212 switch (ifp->if_type) { 213 case IFT_ARCNET: /* XXX MTU handling needs more work */ 214 ndi->maxmtu = MIN(60480, ifp->if_mtu); 215 break; 216 case IFT_ETHER: 217 ndi->maxmtu = MIN(ETHERMTU, ifp->if_mtu); 218 break; 219 case IFT_FDDI: 220 ndi->maxmtu = MIN(FDDIIPMTU, ifp->if_mtu); 221 break; 222 case IFT_ATM: 223 ndi->maxmtu = MIN(ATMMTU, ifp->if_mtu); 224 break; 225 case IFT_IEEE1394: /* XXX should be IEEE1394MTU(1500) */ 226 ndi->maxmtu = MIN(ETHERMTU, ifp->if_mtu); 227 break; 228 #ifdef IFT_IEEE80211 229 case IFT_IEEE80211: /* XXX should be IEEE80211MTU(1500) */ 230 ndi->maxmtu = MIN(ETHERMTU, ifp->if_mtu); 231 break; 232 #endif 233 default: 234 ndi->maxmtu = ifp->if_mtu; 235 break; 236 } 237 238 if (oldmaxmtu != ndi->maxmtu) { 239 /* 240 * If the ND level MTU is not set yet, or if the maxmtu 241 * is reset to a smaller value than the ND level MTU, 242 * also reset the ND level MTU. 243 */ 244 if (ndi->linkmtu == 0 || 245 ndi->maxmtu < ndi->linkmtu) { 246 ndi->linkmtu = ndi->maxmtu; 247 /* also adjust in6_maxmtu if necessary. */ 248 if (oldlinkmtu == 0) { 249 /* 250 * XXX: the case analysis is grotty, but 251 * it is not efficient to call in6_setmaxmtu() 252 * here when we are during the initialization 253 * procedure. 254 */ 255 if (in6_maxmtu < ndi->linkmtu) 256 in6_maxmtu = ndi->linkmtu; 257 } else 258 in6_setmaxmtu(); 259 } 260 } 261 #undef MIN 262 } 263 264 void 265 nd6_option_init(opt, icmp6len, ndopts) 266 void *opt; 267 int icmp6len; 268 union nd_opts *ndopts; 269 { 270 bzero(ndopts, sizeof(*ndopts)); 271 ndopts->nd_opts_search = (struct nd_opt_hdr *)opt; 272 ndopts->nd_opts_last 273 = (struct nd_opt_hdr *)(((u_char *)opt) + icmp6len); 274 275 if (icmp6len == 0) { 276 ndopts->nd_opts_done = 1; 277 ndopts->nd_opts_search = NULL; 278 } 279 } 280 281 /* 282 * Take one ND option. 283 */ 284 struct nd_opt_hdr * 285 nd6_option(ndopts) 286 union nd_opts *ndopts; 287 { 288 struct nd_opt_hdr *nd_opt; 289 int olen; 290 291 if (!ndopts) 292 panic("ndopts == NULL in nd6_option"); 293 if (!ndopts->nd_opts_last) 294 panic("uninitialized ndopts in nd6_option"); 295 if (!ndopts->nd_opts_search) 296 return NULL; 297 if (ndopts->nd_opts_done) 298 return NULL; 299 300 nd_opt = ndopts->nd_opts_search; 301 302 /* make sure nd_opt_len is inside the buffer */ 303 if ((caddr_t)&nd_opt->nd_opt_len >= (caddr_t)ndopts->nd_opts_last) { 304 bzero(ndopts, sizeof(*ndopts)); 305 return NULL; 306 } 307 308 olen = nd_opt->nd_opt_len << 3; 309 if (olen == 0) { 310 /* 311 * Message validation requires that all included 312 * options have a length that is greater than zero. 313 */ 314 bzero(ndopts, sizeof(*ndopts)); 315 return NULL; 316 } 317 318 ndopts->nd_opts_search = (struct nd_opt_hdr *)((caddr_t)nd_opt + olen); 319 if (ndopts->nd_opts_search > ndopts->nd_opts_last) { 320 /* option overruns the end of buffer, invalid */ 321 bzero(ndopts, sizeof(*ndopts)); 322 return NULL; 323 } else if (ndopts->nd_opts_search == ndopts->nd_opts_last) { 324 /* reached the end of options chain */ 325 ndopts->nd_opts_done = 1; 326 ndopts->nd_opts_search = NULL; 327 } 328 return nd_opt; 329 } 330 331 /* 332 * Parse multiple ND options. 333 * This function is much easier to use, for ND routines that do not need 334 * multiple options of the same type. 335 */ 336 int 337 nd6_options(ndopts) 338 union nd_opts *ndopts; 339 { 340 struct nd_opt_hdr *nd_opt; 341 int i = 0; 342 343 if (!ndopts) 344 panic("ndopts == NULL in nd6_options"); 345 if (!ndopts->nd_opts_last) 346 panic("uninitialized ndopts in nd6_options"); 347 if (!ndopts->nd_opts_search) 348 return 0; 349 350 while (1) { 351 nd_opt = nd6_option(ndopts); 352 if (!nd_opt && !ndopts->nd_opts_last) { 353 /* 354 * Message validation requires that all included 355 * options have a length that is greater than zero. 356 */ 357 icmp6stat.icp6s_nd_badopt++; 358 bzero(ndopts, sizeof(*ndopts)); 359 return -1; 360 } 361 362 if (!nd_opt) 363 goto skip1; 364 365 switch (nd_opt->nd_opt_type) { 366 case ND_OPT_SOURCE_LINKADDR: 367 case ND_OPT_TARGET_LINKADDR: 368 case ND_OPT_MTU: 369 case ND_OPT_REDIRECTED_HEADER: 370 if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) { 371 nd6log((LOG_INFO, 372 "duplicated ND6 option found (type=%d)\n", 373 nd_opt->nd_opt_type)); 374 /* XXX bark? */ 375 } else { 376 ndopts->nd_opt_array[nd_opt->nd_opt_type] 377 = nd_opt; 378 } 379 break; 380 case ND_OPT_PREFIX_INFORMATION: 381 if (ndopts->nd_opt_array[nd_opt->nd_opt_type] == 0) { 382 ndopts->nd_opt_array[nd_opt->nd_opt_type] 383 = nd_opt; 384 } 385 ndopts->nd_opts_pi_end = 386 (struct nd_opt_prefix_info *)nd_opt; 387 break; 388 default: 389 /* 390 * Unknown options must be silently ignored, 391 * to accomodate future extension to the protocol. 392 */ 393 nd6log((LOG_DEBUG, 394 "nd6_options: unsupported option %d - " 395 "option ignored\n", nd_opt->nd_opt_type)); 396 } 397 398 skip1: 399 i++; 400 if (i > nd6_maxndopt) { 401 icmp6stat.icp6s_nd_toomanyopt++; 402 nd6log((LOG_INFO, "too many loop in nd opt\n")); 403 break; 404 } 405 406 if (ndopts->nd_opts_done) 407 break; 408 } 409 410 return 0; 411 } 412 413 /* 414 * ND6 timer routine to expire default route list and prefix list 415 */ 416 void 417 nd6_timer(ignored_arg) 418 void *ignored_arg; 419 { 420 int s; 421 struct llinfo_nd6 *ln; 422 struct nd_defrouter *dr; 423 struct nd_prefix *pr; 424 struct ifnet *ifp; 425 struct in6_ifaddr *ia6, *nia6; 426 struct in6_addrlifetime *lt6; 427 428 s = splnet(); 429 callout_reset(&nd6_timer_ch, nd6_prune * hz, 430 nd6_timer, NULL); 431 432 ln = llinfo_nd6.ln_next; 433 while (ln && ln != &llinfo_nd6) { 434 struct rtentry *rt; 435 struct sockaddr_in6 *dst; 436 struct llinfo_nd6 *next = ln->ln_next; 437 /* XXX: used for the DELAY case only: */ 438 struct nd_ifinfo *ndi = NULL; 439 440 if ((rt = ln->ln_rt) == NULL) { 441 ln = next; 442 continue; 443 } 444 if ((ifp = rt->rt_ifp) == NULL) { 445 ln = next; 446 continue; 447 } 448 ndi = &nd_ifinfo[ifp->if_index]; 449 dst = (struct sockaddr_in6 *)rt_key(rt); 450 451 if (ln->ln_expire > time_second) { 452 ln = next; 453 continue; 454 } 455 456 /* sanity check */ 457 if (!rt) 458 panic("rt=0 in nd6_timer(ln=%p)", ln); 459 if (rt->rt_llinfo && (struct llinfo_nd6 *)rt->rt_llinfo != ln) 460 panic("rt_llinfo(%p) is not equal to ln(%p)", 461 rt->rt_llinfo, ln); 462 if (!dst) 463 panic("dst=0 in nd6_timer(ln=%p)", ln); 464 465 switch (ln->ln_state) { 466 case ND6_LLINFO_INCOMPLETE: 467 if (ln->ln_asked < nd6_mmaxtries) { 468 ln->ln_asked++; 469 ln->ln_expire = time_second + 470 nd_ifinfo[ifp->if_index].retrans / 1000; 471 nd6_ns_output(ifp, NULL, &dst->sin6_addr, 472 ln, 0); 473 } else { 474 struct mbuf *m = ln->ln_hold; 475 if (m) { 476 if (rt->rt_ifp) { 477 /* 478 * Fake rcvif to make ICMP error 479 * more helpful in diagnosing 480 * for the receiver. 481 * XXX: should we consider 482 * older rcvif? 483 */ 484 m->m_pkthdr.rcvif = rt->rt_ifp; 485 } 486 icmp6_error(m, ICMP6_DST_UNREACH, 487 ICMP6_DST_UNREACH_ADDR, 0); 488 ln->ln_hold = NULL; 489 } 490 next = nd6_free(rt); 491 } 492 break; 493 case ND6_LLINFO_REACHABLE: 494 if (ln->ln_expire) { 495 ln->ln_state = ND6_LLINFO_STALE; 496 ln->ln_expire = time_second + nd6_gctimer; 497 } 498 break; 499 500 case ND6_LLINFO_STALE: 501 /* Garbage Collection(RFC 2461 5.3) */ 502 if (ln->ln_expire) 503 next = nd6_free(rt); 504 break; 505 506 case ND6_LLINFO_DELAY: 507 if (ndi && (ndi->flags & ND6_IFF_PERFORMNUD) != 0) { 508 /* We need NUD */ 509 ln->ln_asked = 1; 510 ln->ln_state = ND6_LLINFO_PROBE; 511 ln->ln_expire = time_second + 512 ndi->retrans / 1000; 513 nd6_ns_output(ifp, &dst->sin6_addr, 514 &dst->sin6_addr, 515 ln, 0); 516 } else { 517 ln->ln_state = ND6_LLINFO_STALE; /* XXX */ 518 ln->ln_expire = time_second + nd6_gctimer; 519 } 520 break; 521 case ND6_LLINFO_PROBE: 522 if (ln->ln_asked < nd6_umaxtries) { 523 ln->ln_asked++; 524 ln->ln_expire = time_second + 525 nd_ifinfo[ifp->if_index].retrans / 1000; 526 nd6_ns_output(ifp, &dst->sin6_addr, 527 &dst->sin6_addr, ln, 0); 528 } else { 529 next = nd6_free(rt); 530 } 531 break; 532 } 533 ln = next; 534 } 535 536 /* expire default router list */ 537 dr = TAILQ_FIRST(&nd_defrouter); 538 while (dr) { 539 if (dr->expire && dr->expire < time_second) { 540 struct nd_defrouter *t; 541 t = TAILQ_NEXT(dr, dr_entry); 542 defrtrlist_del(dr); 543 dr = t; 544 } else { 545 dr = TAILQ_NEXT(dr, dr_entry); 546 } 547 } 548 549 /* 550 * expire interface addresses. 551 * in the past the loop was inside prefix expiry processing. 552 * However, from a stricter speci-confrmance standpoint, we should 553 * rather separate address lifetimes and prefix lifetimes. 554 */ 555 addrloop: 556 for (ia6 = in6_ifaddr; ia6; ia6 = nia6) { 557 nia6 = ia6->ia_next; 558 /* check address lifetime */ 559 lt6 = &ia6->ia6_lifetime; 560 if (IFA6_IS_INVALID(ia6)) { 561 int regen = 0; 562 563 /* 564 * If the expiring address is temporary, try 565 * regenerating a new one. This would be useful when 566 * we suspended a laptop PC, then turned it on after a 567 * period that could invalidate all temporary 568 * addresses. Although we may have to restart the 569 * loop (see below), it must be after purging the 570 * address. Otherwise, we'd see an infinite loop of 571 * regeneration. 572 */ 573 if (ip6_use_tempaddr && 574 (ia6->ia6_flags & IN6_IFF_TEMPORARY) != 0) { 575 if (regen_tmpaddr(ia6) == 0) 576 regen = 1; 577 } 578 579 in6_purgeaddr(&ia6->ia_ifa); 580 581 if (regen) 582 goto addrloop; /* XXX: see below */ 583 } 584 if (IFA6_IS_DEPRECATED(ia6)) { 585 int oldflags = ia6->ia6_flags; 586 587 ia6->ia6_flags |= IN6_IFF_DEPRECATED; 588 589 /* 590 * If a temporary address has just become deprecated, 591 * regenerate a new one if possible. 592 */ 593 if (ip6_use_tempaddr && 594 (ia6->ia6_flags & IN6_IFF_TEMPORARY) != 0 && 595 (oldflags & IN6_IFF_DEPRECATED) == 0) { 596 597 if (regen_tmpaddr(ia6) == 0) { 598 /* 599 * A new temporary address is 600 * generated. 601 * XXX: this means the address chain 602 * has changed while we are still in 603 * the loop. Although the change 604 * would not cause disaster (because 605 * it's not a deletion, but an 606 * addition,) we'd rather restart the 607 * loop just for safety. Or does this 608 * significantly reduce performance?? 609 */ 610 goto addrloop; 611 } 612 } 613 } else { 614 /* 615 * A new RA might have made a deprecated address 616 * preferred. 617 */ 618 ia6->ia6_flags &= ~IN6_IFF_DEPRECATED; 619 } 620 } 621 622 /* expire prefix list */ 623 pr = nd_prefix.lh_first; 624 while (pr) { 625 /* 626 * check prefix lifetime. 627 * since pltime is just for autoconf, pltime processing for 628 * prefix is not necessary. 629 */ 630 if (pr->ndpr_expire && pr->ndpr_expire < time_second) { 631 struct nd_prefix *t; 632 t = pr->ndpr_next; 633 634 /* 635 * address expiration and prefix expiration are 636 * separate. NEVER perform in6_purgeaddr here. 637 */ 638 639 prelist_remove(pr); 640 pr = t; 641 } else 642 pr = pr->ndpr_next; 643 } 644 splx(s); 645 } 646 647 static int 648 regen_tmpaddr(ia6) 649 struct in6_ifaddr *ia6; /* deprecated/invalidated temporary address */ 650 { 651 struct ifaddr *ifa; 652 struct ifnet *ifp; 653 struct in6_ifaddr *public_ifa6 = NULL; 654 655 ifp = ia6->ia_ifa.ifa_ifp; 656 for (ifa = ifp->if_addrlist.tqh_first; ifa; 657 ifa = ifa->ifa_list.tqe_next) 658 { 659 struct in6_ifaddr *it6; 660 661 if (ifa->ifa_addr->sa_family != AF_INET6) 662 continue; 663 664 it6 = (struct in6_ifaddr *)ifa; 665 666 /* ignore no autoconf addresses. */ 667 if ((it6->ia6_flags & IN6_IFF_AUTOCONF) == 0) 668 continue; 669 670 /* ignore autoconf addresses with different prefixes. */ 671 if (it6->ia6_ndpr == NULL || it6->ia6_ndpr != ia6->ia6_ndpr) 672 continue; 673 674 /* 675 * Now we are looking at an autoconf address with the same 676 * prefix as ours. If the address is temporary and is still 677 * preferred, do not create another one. It would be rare, but 678 * could happen, for example, when we resume a laptop PC after 679 * a long period. 680 */ 681 if ((it6->ia6_flags & IN6_IFF_TEMPORARY) != 0 && 682 !IFA6_IS_DEPRECATED(it6)) { 683 public_ifa6 = NULL; 684 break; 685 } 686 687 /* 688 * This is a public autoconf address that has the same prefix 689 * as ours. If it is preferred, keep it. We can't break the 690 * loop here, because there may be a still-preferred temporary 691 * address with the prefix. 692 */ 693 if (!IFA6_IS_DEPRECATED(it6)) 694 public_ifa6 = it6; 695 } 696 697 if (public_ifa6 != NULL) { 698 int e; 699 700 if ((e = in6_tmpifadd(public_ifa6, 0)) != 0) { 701 log(LOG_NOTICE, "regen_tmpaddr: failed to create a new" 702 " tmp addr,errno=%d\n", e); 703 return(-1); 704 } 705 return(0); 706 } 707 708 return(-1); 709 } 710 711 /* 712 * Nuke neighbor cache/prefix/default router management table, right before 713 * ifp goes away. 714 */ 715 void 716 nd6_purge(ifp) 717 struct ifnet *ifp; 718 { 719 struct llinfo_nd6 *ln, *nln; 720 struct nd_defrouter *dr, *ndr, drany; 721 struct nd_prefix *pr, *npr; 722 723 /* Nuke default router list entries toward ifp */ 724 if ((dr = TAILQ_FIRST(&nd_defrouter)) != NULL) { 725 /* 726 * The first entry of the list may be stored in 727 * the routing table, so we'll delete it later. 728 */ 729 for (dr = TAILQ_NEXT(dr, dr_entry); dr; dr = ndr) { 730 ndr = TAILQ_NEXT(dr, dr_entry); 731 if (dr->ifp == ifp) 732 defrtrlist_del(dr); 733 } 734 dr = TAILQ_FIRST(&nd_defrouter); 735 if (dr->ifp == ifp) 736 defrtrlist_del(dr); 737 } 738 739 /* Nuke prefix list entries toward ifp */ 740 for (pr = nd_prefix.lh_first; pr; pr = npr) { 741 npr = pr->ndpr_next; 742 if (pr->ndpr_ifp == ifp) { 743 /* 744 * Previously, pr->ndpr_addr is removed as well, 745 * but I strongly believe we don't have to do it. 746 * nd6_purge() is only called from in6_ifdetach(), 747 * which removes all the associated interface addresses 748 * by itself. 749 * (jinmei@kame.net 20010129) 750 */ 751 prelist_remove(pr); 752 } 753 } 754 755 /* cancel default outgoing interface setting */ 756 if (nd6_defifindex == ifp->if_index) 757 nd6_setdefaultiface(0); 758 759 if (!ip6_forwarding && ip6_accept_rtadv) { /* XXX: too restrictive? */ 760 /* refresh default router list */ 761 bzero(&drany, sizeof(drany)); 762 defrouter_delreq(&drany, 0); 763 defrouter_select(); 764 } 765 766 /* 767 * Nuke neighbor cache entries for the ifp. 768 * Note that rt->rt_ifp may not be the same as ifp, 769 * due to KAME goto ours hack. See RTM_RESOLVE case in 770 * nd6_rtrequest(), and ip6_input(). 771 */ 772 ln = llinfo_nd6.ln_next; 773 while (ln && ln != &llinfo_nd6) { 774 struct rtentry *rt; 775 struct sockaddr_dl *sdl; 776 777 nln = ln->ln_next; 778 rt = ln->ln_rt; 779 if (rt && rt->rt_gateway && 780 rt->rt_gateway->sa_family == AF_LINK) { 781 sdl = (struct sockaddr_dl *)rt->rt_gateway; 782 if (sdl->sdl_index == ifp->if_index) 783 nln = nd6_free(rt); 784 } 785 ln = nln; 786 } 787 } 788 789 struct rtentry * 790 nd6_lookup(addr6, create, ifp) 791 struct in6_addr *addr6; 792 int create; 793 struct ifnet *ifp; 794 { 795 struct rtentry *rt; 796 struct sockaddr_in6 sin6; 797 798 bzero(&sin6, sizeof(sin6)); 799 sin6.sin6_len = sizeof(struct sockaddr_in6); 800 sin6.sin6_family = AF_INET6; 801 sin6.sin6_addr = *addr6; 802 #ifdef SCOPEDROUTING 803 sin6.sin6_scope_id = in6_addr2scopeid(ifp, addr6); 804 #endif 805 rt = rtalloc1((struct sockaddr *)&sin6, create, 0UL); 806 if (rt && (rt->rt_flags & RTF_LLINFO) == 0) { 807 /* 808 * This is the case for the default route. 809 * If we want to create a neighbor cache for the address, we 810 * should free the route for the destination and allocate an 811 * interface route. 812 */ 813 if (create) { 814 RTFREE(rt); 815 rt = 0; 816 } 817 } 818 if (!rt) { 819 if (create && ifp) { 820 int e; 821 822 /* 823 * If no route is available and create is set, 824 * we allocate a host route for the destination 825 * and treat it like an interface route. 826 * This hack is necessary for a neighbor which can't 827 * be covered by our own prefix. 828 */ 829 struct ifaddr *ifa = 830 ifaof_ifpforaddr((struct sockaddr *)&sin6, ifp); 831 if (ifa == NULL) 832 return(NULL); 833 834 /* 835 * Create a new route. RTF_LLINFO is necessary 836 * to create a Neighbor Cache entry for the 837 * destination in nd6_rtrequest which will be 838 * called in rtrequest via ifa->ifa_rtrequest. 839 */ 840 if ((e = rtrequest(RTM_ADD, (struct sockaddr *)&sin6, 841 ifa->ifa_addr, 842 (struct sockaddr *)&all1_sa, 843 (ifa->ifa_flags | 844 RTF_HOST | RTF_LLINFO) & 845 ~RTF_CLONING, 846 &rt)) != 0) 847 log(LOG_ERR, 848 "nd6_lookup: failed to add route for a " 849 "neighbor(%s), errno=%d\n", 850 ip6_sprintf(addr6), e); 851 if (rt == NULL) 852 return(NULL); 853 if (rt->rt_llinfo) { 854 struct llinfo_nd6 *ln = 855 (struct llinfo_nd6 *)rt->rt_llinfo; 856 ln->ln_state = ND6_LLINFO_NOSTATE; 857 } 858 } else 859 return(NULL); 860 } 861 rt->rt_refcnt--; 862 /* 863 * Validation for the entry. 864 * Note that the check for rt_llinfo is necessary because a cloned 865 * route from a parent route that has the L flag (e.g. the default 866 * route to a p2p interface) may have the flag, too, while the 867 * destination is not actually a neighbor. 868 * XXX: we can't use rt->rt_ifp to check for the interface, since 869 * it might be the loopback interface if the entry is for our 870 * own address on a non-loopback interface. Instead, we should 871 * use rt->rt_ifa->ifa_ifp, which would specify the REAL 872 * interface. 873 */ 874 if ((rt->rt_flags & RTF_GATEWAY) || (rt->rt_flags & RTF_LLINFO) == 0 || 875 rt->rt_gateway->sa_family != AF_LINK || rt->rt_llinfo == NULL || 876 (ifp && rt->rt_ifa->ifa_ifp != ifp)) { 877 if (create) { 878 log(LOG_DEBUG, "nd6_lookup: failed to lookup %s (if = %s)\n", 879 ip6_sprintf(addr6), ifp ? if_name(ifp) : "unspec"); 880 /* xxx more logs... kazu */ 881 } 882 return(NULL); 883 } 884 return(rt); 885 } 886 887 /* 888 * Detect if a given IPv6 address identifies a neighbor on a given link. 889 * XXX: should take care of the destination of a p2p link? 890 */ 891 int 892 nd6_is_addr_neighbor(addr, ifp) 893 struct sockaddr_in6 *addr; 894 struct ifnet *ifp; 895 { 896 struct ifaddr *ifa; 897 int i; 898 899 #define IFADDR6(a) ((((struct in6_ifaddr *)(a))->ia_addr).sin6_addr) 900 #define IFMASK6(a) ((((struct in6_ifaddr *)(a))->ia_prefixmask).sin6_addr) 901 902 /* 903 * A link-local address is always a neighbor. 904 * XXX: we should use the sin6_scope_id field rather than the embedded 905 * interface index. 906 */ 907 if (IN6_IS_ADDR_LINKLOCAL(&addr->sin6_addr) && 908 ntohs(*(u_int16_t *)&addr->sin6_addr.s6_addr[2]) == ifp->if_index) 909 return(1); 910 911 /* 912 * If the address matches one of our addresses, 913 * it should be a neighbor. 914 */ 915 for (ifa = ifp->if_addrlist.tqh_first; 916 ifa; 917 ifa = ifa->ifa_list.tqe_next) 918 { 919 if (ifa->ifa_addr->sa_family != AF_INET6) 920 next: continue; 921 922 for (i = 0; i < 4; i++) { 923 if ((IFADDR6(ifa).s6_addr32[i] ^ 924 addr->sin6_addr.s6_addr32[i]) & 925 IFMASK6(ifa).s6_addr32[i]) 926 goto next; 927 } 928 return(1); 929 } 930 931 /* 932 * Even if the address matches none of our addresses, it might be 933 * in the neighbor cache. 934 */ 935 if (nd6_lookup(&addr->sin6_addr, 0, ifp) != NULL) 936 return(1); 937 938 return(0); 939 #undef IFADDR6 940 #undef IFMASK6 941 } 942 943 /* 944 * Free an nd6 llinfo entry. 945 */ 946 struct llinfo_nd6 * 947 nd6_free(rt) 948 struct rtentry *rt; 949 { 950 struct llinfo_nd6 *ln = (struct llinfo_nd6 *)rt->rt_llinfo, *next; 951 struct in6_addr in6 = ((struct sockaddr_in6 *)rt_key(rt))->sin6_addr; 952 struct nd_defrouter *dr; 953 954 /* 955 * we used to have pfctlinput(PRC_HOSTDEAD) here. 956 * even though it is not harmful, it was not really necessary. 957 */ 958 959 if (!ip6_forwarding && ip6_accept_rtadv) { /* XXX: too restrictive? */ 960 int s; 961 s = splnet(); 962 dr = defrouter_lookup(&((struct sockaddr_in6 *)rt_key(rt))->sin6_addr, 963 rt->rt_ifp); 964 965 if (ln->ln_router || dr) { 966 /* 967 * rt6_flush must be called whether or not the neighbor 968 * is in the Default Router List. 969 * See a corresponding comment in nd6_na_input(). 970 */ 971 rt6_flush(&in6, rt->rt_ifp); 972 } 973 974 if (dr) { 975 /* 976 * Unreachablity of a router might affect the default 977 * router selection and on-link detection of advertised 978 * prefixes. 979 */ 980 981 /* 982 * Temporarily fake the state to choose a new default 983 * router and to perform on-link determination of 984 * prefixes correctly. 985 * Below the state will be set correctly, 986 * or the entry itself will be deleted. 987 */ 988 ln->ln_state = ND6_LLINFO_INCOMPLETE; 989 990 /* 991 * Since defrouter_select() does not affect the 992 * on-link determination and MIP6 needs the check 993 * before the default router selection, we perform 994 * the check now. 995 */ 996 pfxlist_onlink_check(); 997 998 if (dr == TAILQ_FIRST(&nd_defrouter)) { 999 /* 1000 * It is used as the current default router, 1001 * so we have to move it to the end of the 1002 * list and choose a new one. 1003 * XXX: it is not very efficient if this is 1004 * the only router. 1005 */ 1006 TAILQ_REMOVE(&nd_defrouter, dr, dr_entry); 1007 TAILQ_INSERT_TAIL(&nd_defrouter, dr, dr_entry); 1008 1009 defrouter_select(); 1010 } 1011 } 1012 splx(s); 1013 } 1014 1015 /* 1016 * Before deleting the entry, remember the next entry as the 1017 * return value. We need this because pfxlist_onlink_check() above 1018 * might have freed other entries (particularly the old next entry) as 1019 * a side effect (XXX). 1020 */ 1021 next = ln->ln_next; 1022 1023 /* 1024 * Detach the route from the routing tree and the list of neighbor 1025 * caches, and disable the route entry not to be used in already 1026 * cached routes. 1027 */ 1028 rtrequest(RTM_DELETE, rt_key(rt), (struct sockaddr *)0, 1029 rt_mask(rt), 0, (struct rtentry **)0); 1030 1031 return(next); 1032 } 1033 1034 /* 1035 * Upper-layer reachability hint for Neighbor Unreachability Detection. 1036 * 1037 * XXX cost-effective metods? 1038 */ 1039 void 1040 nd6_nud_hint(rt, dst6, force) 1041 struct rtentry *rt; 1042 struct in6_addr *dst6; 1043 int force; 1044 { 1045 struct llinfo_nd6 *ln; 1046 1047 /* 1048 * If the caller specified "rt", use that. Otherwise, resolve the 1049 * routing table by supplied "dst6". 1050 */ 1051 if (!rt) { 1052 if (!dst6) 1053 return; 1054 if (!(rt = nd6_lookup(dst6, 0, NULL))) 1055 return; 1056 } 1057 1058 if ((rt->rt_flags & RTF_GATEWAY) != 0 || 1059 (rt->rt_flags & RTF_LLINFO) == 0 || 1060 !rt->rt_llinfo || !rt->rt_gateway || 1061 rt->rt_gateway->sa_family != AF_LINK) { 1062 /* This is not a host route. */ 1063 return; 1064 } 1065 1066 ln = (struct llinfo_nd6 *)rt->rt_llinfo; 1067 if (ln->ln_state < ND6_LLINFO_REACHABLE) 1068 return; 1069 1070 /* 1071 * if we get upper-layer reachability confirmation many times, 1072 * it is possible we have false information. 1073 */ 1074 if (!force) { 1075 ln->ln_byhint++; 1076 if (ln->ln_byhint > nd6_maxnudhint) 1077 return; 1078 } 1079 1080 ln->ln_state = ND6_LLINFO_REACHABLE; 1081 if (ln->ln_expire) 1082 ln->ln_expire = time_second + 1083 nd_ifinfo[rt->rt_ifp->if_index].reachable; 1084 } 1085 1086 void 1087 nd6_rtrequest(req, rt, info) 1088 int req; 1089 struct rtentry *rt; 1090 struct rt_addrinfo *info; /* xxx unused */ 1091 { 1092 struct sockaddr *gate = rt->rt_gateway; 1093 struct llinfo_nd6 *ln = (struct llinfo_nd6 *)rt->rt_llinfo; 1094 static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK}; 1095 struct ifnet *ifp = rt->rt_ifp; 1096 struct ifaddr *ifa; 1097 1098 if ((rt->rt_flags & RTF_GATEWAY)) 1099 return; 1100 1101 if (nd6_need_cache(ifp) == 0 && (rt->rt_flags & RTF_HOST) == 0) { 1102 /* 1103 * This is probably an interface direct route for a link 1104 * which does not need neighbor caches (e.g. fe80::%lo0/64). 1105 * We do not need special treatment below for such a route. 1106 * Moreover, the RTF_LLINFO flag which would be set below 1107 * would annoy the ndp(8) command. 1108 */ 1109 return; 1110 } 1111 1112 if (req == RTM_RESOLVE && 1113 (nd6_need_cache(ifp) == 0 || /* stf case */ 1114 !nd6_is_addr_neighbor((struct sockaddr_in6 *)rt_key(rt), ifp))) { 1115 /* 1116 * FreeBSD and BSD/OS often make a cloned host route based 1117 * on a less-specific route (e.g. the default route). 1118 * If the less specific route does not have a "gateway" 1119 * (this is the case when the route just goes to a p2p or an 1120 * stf interface), we'll mistakenly make a neighbor cache for 1121 * the host route, and will see strange neighbor solicitation 1122 * for the corresponding destination. In order to avoid the 1123 * confusion, we check if the destination of the route is 1124 * a neighbor in terms of neighbor discovery, and stop the 1125 * process if not. Additionally, we remove the LLINFO flag 1126 * so that ndp(8) will not try to get the neighbor information 1127 * of the destination. 1128 */ 1129 rt->rt_flags &= ~RTF_LLINFO; 1130 return; 1131 } 1132 1133 switch (req) { 1134 case RTM_ADD: 1135 /* 1136 * There is no backward compatibility :) 1137 * 1138 * if ((rt->rt_flags & RTF_HOST) == 0 && 1139 * SIN(rt_mask(rt))->sin_addr.s_addr != 0xffffffff) 1140 * rt->rt_flags |= RTF_CLONING; 1141 */ 1142 if (rt->rt_flags & (RTF_CLONING | RTF_LLINFO)) { 1143 /* 1144 * Case 1: This route should come from 1145 * a route to interface. RTF_LLINFO flag is set 1146 * for a host route whose destination should be 1147 * treated as on-link. 1148 */ 1149 rt_setgate(rt, rt_key(rt), 1150 (struct sockaddr *)&null_sdl); 1151 gate = rt->rt_gateway; 1152 SDL(gate)->sdl_type = ifp->if_type; 1153 SDL(gate)->sdl_index = ifp->if_index; 1154 if (ln) 1155 ln->ln_expire = time_second; 1156 #if 1 1157 if (ln && ln->ln_expire == 0) { 1158 /* kludge for desktops */ 1159 #if 0 1160 printf("nd6_rtequest: time.tv_sec is zero; " 1161 "treat it as 1\n"); 1162 #endif 1163 ln->ln_expire = 1; 1164 } 1165 #endif 1166 if ((rt->rt_flags & RTF_CLONING)) 1167 break; 1168 } 1169 /* 1170 * In IPv4 code, we try to annonuce new RTF_ANNOUNCE entry here. 1171 * We don't do that here since llinfo is not ready yet. 1172 * 1173 * There are also couple of other things to be discussed: 1174 * - unsolicited NA code needs improvement beforehand 1175 * - RFC2461 says we MAY send multicast unsolicited NA 1176 * (7.2.6 paragraph 4), however, it also says that we 1177 * SHOULD provide a mechanism to prevent multicast NA storm. 1178 * we don't have anything like it right now. 1179 * note that the mechanism needs a mutual agreement 1180 * between proxies, which means that we need to implement 1181 * a new protocol, or a new kludge. 1182 * - from RFC2461 6.2.4, host MUST NOT send an unsolicited NA. 1183 * we need to check ip6forwarding before sending it. 1184 * (or should we allow proxy ND configuration only for 1185 * routers? there's no mention about proxy ND from hosts) 1186 */ 1187 #if 0 1188 /* XXX it does not work */ 1189 if (rt->rt_flags & RTF_ANNOUNCE) 1190 nd6_na_output(ifp, 1191 &SIN6(rt_key(rt))->sin6_addr, 1192 &SIN6(rt_key(rt))->sin6_addr, 1193 ip6_forwarding ? ND_NA_FLAG_ROUTER : 0, 1194 1, NULL); 1195 #endif 1196 /* FALLTHROUGH */ 1197 case RTM_RESOLVE: 1198 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) == 0) { 1199 /* 1200 * Address resolution isn't necessary for a point to 1201 * point link, so we can skip this test for a p2p link. 1202 */ 1203 if (gate->sa_family != AF_LINK || 1204 gate->sa_len < sizeof(null_sdl)) { 1205 log(LOG_DEBUG, 1206 "nd6_rtrequest: bad gateway value: %s\n", 1207 if_name(ifp)); 1208 break; 1209 } 1210 SDL(gate)->sdl_type = ifp->if_type; 1211 SDL(gate)->sdl_index = ifp->if_index; 1212 } 1213 if (ln != NULL) 1214 break; /* This happens on a route change */ 1215 /* 1216 * Case 2: This route may come from cloning, or a manual route 1217 * add with a LL address. 1218 */ 1219 R_Malloc(ln, struct llinfo_nd6 *, sizeof(*ln)); 1220 rt->rt_llinfo = (caddr_t)ln; 1221 if (!ln) { 1222 log(LOG_DEBUG, "nd6_rtrequest: malloc failed\n"); 1223 break; 1224 } 1225 nd6_inuse++; 1226 nd6_allocated++; 1227 Bzero(ln, sizeof(*ln)); 1228 ln->ln_rt = rt; 1229 /* this is required for "ndp" command. - shin */ 1230 if (req == RTM_ADD) { 1231 /* 1232 * gate should have some valid AF_LINK entry, 1233 * and ln->ln_expire should have some lifetime 1234 * which is specified by ndp command. 1235 */ 1236 ln->ln_state = ND6_LLINFO_REACHABLE; 1237 ln->ln_byhint = 0; 1238 } else { 1239 /* 1240 * When req == RTM_RESOLVE, rt is created and 1241 * initialized in rtrequest(), so rt_expire is 0. 1242 */ 1243 ln->ln_state = ND6_LLINFO_NOSTATE; 1244 ln->ln_expire = time_second; 1245 } 1246 rt->rt_flags |= RTF_LLINFO; 1247 ln->ln_next = llinfo_nd6.ln_next; 1248 llinfo_nd6.ln_next = ln; 1249 ln->ln_prev = &llinfo_nd6; 1250 ln->ln_next->ln_prev = ln; 1251 1252 /* 1253 * check if rt_key(rt) is one of my address assigned 1254 * to the interface. 1255 */ 1256 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(rt->rt_ifp, 1257 &SIN6(rt_key(rt))->sin6_addr); 1258 if (ifa) { 1259 caddr_t macp = nd6_ifptomac(ifp); 1260 ln->ln_expire = 0; 1261 ln->ln_state = ND6_LLINFO_REACHABLE; 1262 ln->ln_byhint = 0; 1263 if (macp) { 1264 Bcopy(macp, LLADDR(SDL(gate)), ifp->if_addrlen); 1265 SDL(gate)->sdl_alen = ifp->if_addrlen; 1266 } 1267 if (nd6_useloopback) { 1268 rt->rt_ifp = &loif[0]; /* XXX */ 1269 /* 1270 * Make sure rt_ifa be equal to the ifaddr 1271 * corresponding to the address. 1272 * We need this because when we refer 1273 * rt_ifa->ia6_flags in ip6_input, we assume 1274 * that the rt_ifa points to the address instead 1275 * of the loopback address. 1276 */ 1277 if (ifa != rt->rt_ifa) { 1278 IFAFREE(rt->rt_ifa); 1279 IFAREF(ifa); 1280 rt->rt_ifa = ifa; 1281 } 1282 } 1283 } else if (rt->rt_flags & RTF_ANNOUNCE) { 1284 ln->ln_expire = 0; 1285 ln->ln_state = ND6_LLINFO_REACHABLE; 1286 ln->ln_byhint = 0; 1287 1288 /* join solicited node multicast for proxy ND */ 1289 if (ifp->if_flags & IFF_MULTICAST) { 1290 struct in6_addr llsol; 1291 int error; 1292 1293 llsol = SIN6(rt_key(rt))->sin6_addr; 1294 llsol.s6_addr16[0] = htons(0xff02); 1295 llsol.s6_addr16[1] = htons(ifp->if_index); 1296 llsol.s6_addr32[1] = 0; 1297 llsol.s6_addr32[2] = htonl(1); 1298 llsol.s6_addr8[12] = 0xff; 1299 1300 if (!in6_addmulti(&llsol, ifp, &error)) { 1301 nd6log((LOG_ERR, "%s: failed to join " 1302 "%s (errno=%d)\n", if_name(ifp), 1303 ip6_sprintf(&llsol), error)); 1304 } 1305 } 1306 } 1307 break; 1308 1309 case RTM_DELETE: 1310 if (!ln) 1311 break; 1312 /* leave from solicited node multicast for proxy ND */ 1313 if ((rt->rt_flags & RTF_ANNOUNCE) != 0 && 1314 (ifp->if_flags & IFF_MULTICAST) != 0) { 1315 struct in6_addr llsol; 1316 struct in6_multi *in6m; 1317 1318 llsol = SIN6(rt_key(rt))->sin6_addr; 1319 llsol.s6_addr16[0] = htons(0xff02); 1320 llsol.s6_addr16[1] = htons(ifp->if_index); 1321 llsol.s6_addr32[1] = 0; 1322 llsol.s6_addr32[2] = htonl(1); 1323 llsol.s6_addr8[12] = 0xff; 1324 1325 IN6_LOOKUP_MULTI(llsol, ifp, in6m); 1326 if (in6m) 1327 in6_delmulti(in6m); 1328 } 1329 nd6_inuse--; 1330 ln->ln_next->ln_prev = ln->ln_prev; 1331 ln->ln_prev->ln_next = ln->ln_next; 1332 ln->ln_prev = NULL; 1333 rt->rt_llinfo = 0; 1334 rt->rt_flags &= ~RTF_LLINFO; 1335 if (ln->ln_hold) 1336 m_freem(ln->ln_hold); 1337 Free((caddr_t)ln); 1338 } 1339 } 1340 1341 int 1342 nd6_ioctl(cmd, data, ifp) 1343 u_long cmd; 1344 caddr_t data; 1345 struct ifnet *ifp; 1346 { 1347 struct in6_drlist *drl = (struct in6_drlist *)data; 1348 struct in6_prlist *prl = (struct in6_prlist *)data; 1349 struct in6_ndireq *ndi = (struct in6_ndireq *)data; 1350 struct in6_nbrinfo *nbi = (struct in6_nbrinfo *)data; 1351 struct in6_ndifreq *ndif = (struct in6_ndifreq *)data; 1352 struct nd_defrouter *dr, any; 1353 struct nd_prefix *pr; 1354 struct rtentry *rt; 1355 int i = 0, error = 0; 1356 int s; 1357 1358 switch (cmd) { 1359 case SIOCGDRLST_IN6: 1360 /* 1361 * obsolete API, use sysctl under net.inet6.icmp6 1362 */ 1363 bzero(drl, sizeof(*drl)); 1364 s = splnet(); 1365 dr = TAILQ_FIRST(&nd_defrouter); 1366 while (dr && i < DRLSTSIZ) { 1367 drl->defrouter[i].rtaddr = dr->rtaddr; 1368 if (IN6_IS_ADDR_LINKLOCAL(&drl->defrouter[i].rtaddr)) { 1369 /* XXX: need to this hack for KAME stack */ 1370 drl->defrouter[i].rtaddr.s6_addr16[1] = 0; 1371 } else 1372 log(LOG_ERR, 1373 "default router list contains a " 1374 "non-linklocal address(%s)\n", 1375 ip6_sprintf(&drl->defrouter[i].rtaddr)); 1376 1377 drl->defrouter[i].flags = dr->flags; 1378 drl->defrouter[i].rtlifetime = dr->rtlifetime; 1379 drl->defrouter[i].expire = dr->expire; 1380 drl->defrouter[i].if_index = dr->ifp->if_index; 1381 i++; 1382 dr = TAILQ_NEXT(dr, dr_entry); 1383 } 1384 splx(s); 1385 break; 1386 case SIOCGPRLST_IN6: 1387 /* 1388 * obsolete API, use sysctl under net.inet6.icmp6 1389 */ 1390 /* 1391 * XXX meaning of fields, especialy "raflags", is very 1392 * differnet between RA prefix list and RR/static prefix list. 1393 * how about separating ioctls into two? 1394 */ 1395 bzero(prl, sizeof(*prl)); 1396 s = splnet(); 1397 pr = nd_prefix.lh_first; 1398 while (pr && i < PRLSTSIZ) { 1399 struct nd_pfxrouter *pfr; 1400 int j; 1401 1402 (void)in6_embedscope(&prl->prefix[i].prefix, 1403 &pr->ndpr_prefix, NULL, NULL); 1404 prl->prefix[i].raflags = pr->ndpr_raf; 1405 prl->prefix[i].prefixlen = pr->ndpr_plen; 1406 prl->prefix[i].vltime = pr->ndpr_vltime; 1407 prl->prefix[i].pltime = pr->ndpr_pltime; 1408 prl->prefix[i].if_index = pr->ndpr_ifp->if_index; 1409 prl->prefix[i].expire = pr->ndpr_expire; 1410 1411 pfr = pr->ndpr_advrtrs.lh_first; 1412 j = 0; 1413 while (pfr) { 1414 if (j < DRLSTSIZ) { 1415 #define RTRADDR prl->prefix[i].advrtr[j] 1416 RTRADDR = pfr->router->rtaddr; 1417 if (IN6_IS_ADDR_LINKLOCAL(&RTRADDR)) { 1418 /* XXX: hack for KAME */ 1419 RTRADDR.s6_addr16[1] = 0; 1420 } else 1421 log(LOG_ERR, 1422 "a router(%s) advertises " 1423 "a prefix with " 1424 "non-link local address\n", 1425 ip6_sprintf(&RTRADDR)); 1426 #undef RTRADDR 1427 } 1428 j++; 1429 pfr = pfr->pfr_next; 1430 } 1431 prl->prefix[i].advrtrs = j; 1432 prl->prefix[i].origin = PR_ORIG_RA; 1433 1434 i++; 1435 pr = pr->ndpr_next; 1436 } 1437 { 1438 struct rr_prefix *rpp; 1439 1440 for (rpp = LIST_FIRST(&rr_prefix); rpp; 1441 rpp = LIST_NEXT(rpp, rp_entry)) { 1442 if (i >= PRLSTSIZ) 1443 break; 1444 (void)in6_embedscope(&prl->prefix[i].prefix, 1445 &pr->ndpr_prefix, NULL, NULL); 1446 prl->prefix[i].raflags = rpp->rp_raf; 1447 prl->prefix[i].prefixlen = rpp->rp_plen; 1448 prl->prefix[i].vltime = rpp->rp_vltime; 1449 prl->prefix[i].pltime = rpp->rp_pltime; 1450 prl->prefix[i].if_index = rpp->rp_ifp->if_index; 1451 prl->prefix[i].expire = rpp->rp_expire; 1452 prl->prefix[i].advrtrs = 0; 1453 prl->prefix[i].origin = rpp->rp_origin; 1454 i++; 1455 } 1456 } 1457 splx(s); 1458 1459 break; 1460 case OSIOCGIFINFO_IN6: 1461 if (!nd_ifinfo || i >= nd_ifinfo_indexlim) { 1462 error = EINVAL; 1463 break; 1464 } 1465 ndi->ndi.linkmtu = nd_ifinfo[ifp->if_index].linkmtu; 1466 ndi->ndi.maxmtu = nd_ifinfo[ifp->if_index].maxmtu; 1467 ndi->ndi.basereachable = 1468 nd_ifinfo[ifp->if_index].basereachable; 1469 ndi->ndi.reachable = nd_ifinfo[ifp->if_index].reachable; 1470 ndi->ndi.retrans = nd_ifinfo[ifp->if_index].retrans; 1471 ndi->ndi.flags = nd_ifinfo[ifp->if_index].flags; 1472 ndi->ndi.recalctm = nd_ifinfo[ifp->if_index].recalctm; 1473 ndi->ndi.chlim = nd_ifinfo[ifp->if_index].chlim; 1474 ndi->ndi.receivedra = nd_ifinfo[ifp->if_index].receivedra; 1475 break; 1476 case SIOCGIFINFO_IN6: 1477 if (!nd_ifinfo || i >= nd_ifinfo_indexlim) { 1478 error = EINVAL; 1479 break; 1480 } 1481 ndi->ndi = nd_ifinfo[ifp->if_index]; 1482 break; 1483 case SIOCSIFINFO_FLAGS: 1484 /* XXX: almost all other fields of ndi->ndi is unused */ 1485 if (!nd_ifinfo || i >= nd_ifinfo_indexlim) { 1486 error = EINVAL; 1487 break; 1488 } 1489 nd_ifinfo[ifp->if_index].flags = ndi->ndi.flags; 1490 break; 1491 case SIOCSNDFLUSH_IN6: /* XXX: the ioctl name is confusing... */ 1492 /* flush default router list */ 1493 /* 1494 * xxx sumikawa: should not delete route if default 1495 * route equals to the top of default router list 1496 */ 1497 bzero(&any, sizeof(any)); 1498 defrouter_delreq(&any, 0); 1499 defrouter_select(); 1500 /* xxx sumikawa: flush prefix list */ 1501 break; 1502 case SIOCSPFXFLUSH_IN6: 1503 { 1504 /* flush all the prefix advertised by routers */ 1505 struct nd_prefix *pr, *next; 1506 1507 s = splnet(); 1508 for (pr = nd_prefix.lh_first; pr; pr = next) { 1509 struct in6_ifaddr *ia, *ia_next; 1510 1511 next = pr->ndpr_next; 1512 1513 if (IN6_IS_ADDR_LINKLOCAL(&pr->ndpr_prefix.sin6_addr)) 1514 continue; /* XXX */ 1515 1516 /* do we really have to remove addresses as well? */ 1517 for (ia = in6_ifaddr; ia; ia = ia_next) { 1518 /* ia might be removed. keep the next ptr. */ 1519 ia_next = ia->ia_next; 1520 1521 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) == 0) 1522 continue; 1523 1524 if (ia->ia6_ndpr == pr) 1525 in6_purgeaddr(&ia->ia_ifa); 1526 } 1527 prelist_remove(pr); 1528 } 1529 splx(s); 1530 break; 1531 } 1532 case SIOCSRTRFLUSH_IN6: 1533 { 1534 /* flush all the default routers */ 1535 struct nd_defrouter *dr, *next; 1536 1537 s = splnet(); 1538 if ((dr = TAILQ_FIRST(&nd_defrouter)) != NULL) { 1539 /* 1540 * The first entry of the list may be stored in 1541 * the routing table, so we'll delete it later. 1542 */ 1543 for (dr = TAILQ_NEXT(dr, dr_entry); dr; dr = next) { 1544 next = TAILQ_NEXT(dr, dr_entry); 1545 defrtrlist_del(dr); 1546 } 1547 defrtrlist_del(TAILQ_FIRST(&nd_defrouter)); 1548 } 1549 splx(s); 1550 break; 1551 } 1552 case SIOCGNBRINFO_IN6: 1553 { 1554 struct llinfo_nd6 *ln; 1555 struct in6_addr nb_addr = nbi->addr; /* make local for safety */ 1556 1557 /* 1558 * XXX: KAME specific hack for scoped addresses 1559 * XXXX: for other scopes than link-local? 1560 */ 1561 if (IN6_IS_ADDR_LINKLOCAL(&nbi->addr) || 1562 IN6_IS_ADDR_MC_LINKLOCAL(&nbi->addr)) { 1563 u_int16_t *idp = (u_int16_t *)&nb_addr.s6_addr[2]; 1564 1565 if (*idp == 0) 1566 *idp = htons(ifp->if_index); 1567 } 1568 1569 s = splnet(); 1570 if ((rt = nd6_lookup(&nb_addr, 0, ifp)) == NULL) { 1571 error = EINVAL; 1572 splx(s); 1573 break; 1574 } 1575 ln = (struct llinfo_nd6 *)rt->rt_llinfo; 1576 nbi->state = ln->ln_state; 1577 nbi->asked = ln->ln_asked; 1578 nbi->isrouter = ln->ln_router; 1579 nbi->expire = ln->ln_expire; 1580 splx(s); 1581 1582 break; 1583 } 1584 case SIOCGDEFIFACE_IN6: /* XXX: should be implemented as a sysctl? */ 1585 ndif->ifindex = nd6_defifindex; 1586 break; 1587 case SIOCSDEFIFACE_IN6: /* XXX: should be implemented as a sysctl? */ 1588 return(nd6_setdefaultiface(ndif->ifindex)); 1589 break; 1590 } 1591 return(error); 1592 } 1593 1594 /* 1595 * Create neighbor cache entry and cache link-layer address, 1596 * on reception of inbound ND6 packets. (RS/RA/NS/redirect) 1597 */ 1598 struct rtentry * 1599 nd6_cache_lladdr(ifp, from, lladdr, lladdrlen, type, code) 1600 struct ifnet *ifp; 1601 struct in6_addr *from; 1602 char *lladdr; 1603 int lladdrlen; 1604 int type; /* ICMP6 type */ 1605 int code; /* type dependent information */ 1606 { 1607 struct rtentry *rt = NULL; 1608 struct llinfo_nd6 *ln = NULL; 1609 int is_newentry; 1610 struct sockaddr_dl *sdl = NULL; 1611 int do_update; 1612 int olladdr; 1613 int llchange; 1614 int newstate = 0; 1615 1616 if (!ifp) 1617 panic("ifp == NULL in nd6_cache_lladdr"); 1618 if (!from) 1619 panic("from == NULL in nd6_cache_lladdr"); 1620 1621 /* nothing must be updated for unspecified address */ 1622 if (IN6_IS_ADDR_UNSPECIFIED(from)) 1623 return NULL; 1624 1625 /* 1626 * Validation about ifp->if_addrlen and lladdrlen must be done in 1627 * the caller. 1628 * 1629 * XXX If the link does not have link-layer adderss, what should 1630 * we do? (ifp->if_addrlen == 0) 1631 * Spec says nothing in sections for RA, RS and NA. There's small 1632 * description on it in NS section (RFC 2461 7.2.3). 1633 */ 1634 1635 rt = nd6_lookup(from, 0, ifp); 1636 if (!rt) { 1637 #if 0 1638 /* nothing must be done if there's no lladdr */ 1639 if (!lladdr || !lladdrlen) 1640 return NULL; 1641 #endif 1642 1643 rt = nd6_lookup(from, 1, ifp); 1644 is_newentry = 1; 1645 } else { 1646 /* do nothing if static ndp is set */ 1647 if (rt->rt_flags & RTF_STATIC) 1648 return NULL; 1649 is_newentry = 0; 1650 } 1651 1652 if (!rt) 1653 return NULL; 1654 if ((rt->rt_flags & (RTF_GATEWAY | RTF_LLINFO)) != RTF_LLINFO) { 1655 fail: 1656 (void)nd6_free(rt); 1657 return NULL; 1658 } 1659 ln = (struct llinfo_nd6 *)rt->rt_llinfo; 1660 if (!ln) 1661 goto fail; 1662 if (!rt->rt_gateway) 1663 goto fail; 1664 if (rt->rt_gateway->sa_family != AF_LINK) 1665 goto fail; 1666 sdl = SDL(rt->rt_gateway); 1667 1668 olladdr = (sdl->sdl_alen) ? 1 : 0; 1669 if (olladdr && lladdr) { 1670 if (bcmp(lladdr, LLADDR(sdl), ifp->if_addrlen)) 1671 llchange = 1; 1672 else 1673 llchange = 0; 1674 } else 1675 llchange = 0; 1676 1677 /* 1678 * newentry olladdr lladdr llchange (*=record) 1679 * 0 n n -- (1) 1680 * 0 y n -- (2) 1681 * 0 n y -- (3) * STALE 1682 * 0 y y n (4) * 1683 * 0 y y y (5) * STALE 1684 * 1 -- n -- (6) NOSTATE(= PASSIVE) 1685 * 1 -- y -- (7) * STALE 1686 */ 1687 1688 if (lladdr) { /* (3-5) and (7) */ 1689 /* 1690 * Record source link-layer address 1691 * XXX is it dependent to ifp->if_type? 1692 */ 1693 sdl->sdl_alen = ifp->if_addrlen; 1694 bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen); 1695 } 1696 1697 if (!is_newentry) { 1698 if ((!olladdr && lladdr) /* (3) */ 1699 || (olladdr && lladdr && llchange)) { /* (5) */ 1700 do_update = 1; 1701 newstate = ND6_LLINFO_STALE; 1702 } else /* (1-2,4) */ 1703 do_update = 0; 1704 } else { 1705 do_update = 1; 1706 if (!lladdr) /* (6) */ 1707 newstate = ND6_LLINFO_NOSTATE; 1708 else /* (7) */ 1709 newstate = ND6_LLINFO_STALE; 1710 } 1711 1712 if (do_update) { 1713 /* 1714 * Update the state of the neighbor cache. 1715 */ 1716 ln->ln_state = newstate; 1717 1718 if (ln->ln_state == ND6_LLINFO_STALE) { 1719 /* 1720 * XXX: since nd6_output() below will cause 1721 * state tansition to DELAY and reset the timer, 1722 * we must set the timer now, although it is actually 1723 * meaningless. 1724 */ 1725 ln->ln_expire = time_second + nd6_gctimer; 1726 1727 if (ln->ln_hold) { 1728 /* 1729 * we assume ifp is not a p2p here, so just 1730 * set the 2nd argument as the 1st one. 1731 */ 1732 nd6_output(ifp, ifp, ln->ln_hold, 1733 (struct sockaddr_in6 *)rt_key(rt), 1734 rt); 1735 ln->ln_hold = NULL; 1736 } 1737 } else if (ln->ln_state == ND6_LLINFO_INCOMPLETE) { 1738 /* probe right away */ 1739 ln->ln_expire = time_second; 1740 } 1741 } 1742 1743 /* 1744 * ICMP6 type dependent behavior. 1745 * 1746 * NS: clear IsRouter if new entry 1747 * RS: clear IsRouter 1748 * RA: set IsRouter if there's lladdr 1749 * redir: clear IsRouter if new entry 1750 * 1751 * RA case, (1): 1752 * The spec says that we must set IsRouter in the following cases: 1753 * - If lladdr exist, set IsRouter. This means (1-5). 1754 * - If it is old entry (!newentry), set IsRouter. This means (7). 1755 * So, based on the spec, in (1-5) and (7) cases we must set IsRouter. 1756 * A quetion arises for (1) case. (1) case has no lladdr in the 1757 * neighbor cache, this is similar to (6). 1758 * This case is rare but we figured that we MUST NOT set IsRouter. 1759 * 1760 * newentry olladdr lladdr llchange NS RS RA redir 1761 * D R 1762 * 0 n n -- (1) c ? s 1763 * 0 y n -- (2) c s s 1764 * 0 n y -- (3) c s s 1765 * 0 y y n (4) c s s 1766 * 0 y y y (5) c s s 1767 * 1 -- n -- (6) c c c s 1768 * 1 -- y -- (7) c c s c s 1769 * 1770 * (c=clear s=set) 1771 */ 1772 switch (type & 0xff) { 1773 case ND_NEIGHBOR_SOLICIT: 1774 /* 1775 * New entry must have is_router flag cleared. 1776 */ 1777 if (is_newentry) /* (6-7) */ 1778 ln->ln_router = 0; 1779 break; 1780 case ND_REDIRECT: 1781 /* 1782 * If the icmp is a redirect to a better router, always set the 1783 * is_router flag. Otherwise, if the entry is newly created, 1784 * clear the flag. [RFC 2461, sec 8.3] 1785 */ 1786 if (code == ND_REDIRECT_ROUTER) 1787 ln->ln_router = 1; 1788 else if (is_newentry) /* (6-7) */ 1789 ln->ln_router = 0; 1790 break; 1791 case ND_ROUTER_SOLICIT: 1792 /* 1793 * is_router flag must always be cleared. 1794 */ 1795 ln->ln_router = 0; 1796 break; 1797 case ND_ROUTER_ADVERT: 1798 /* 1799 * Mark an entry with lladdr as a router. 1800 */ 1801 if ((!is_newentry && (olladdr || lladdr)) /* (2-5) */ 1802 || (is_newentry && lladdr)) { /* (7) */ 1803 ln->ln_router = 1; 1804 } 1805 break; 1806 } 1807 1808 /* 1809 * When the link-layer address of a router changes, select the 1810 * best router again. In particular, when the neighbor entry is newly 1811 * created, it might affect the selection policy. 1812 * Question: can we restrict the first condition to the "is_newentry" 1813 * case? 1814 * XXX: when we hear an RA from a new router with the link-layer 1815 * address option, defrouter_select() is called twice, since 1816 * defrtrlist_update called the function as well. However, I believe 1817 * we can compromise the overhead, since it only happens the first 1818 * time. 1819 * XXX: although defrouter_select() should not have a bad effect 1820 * for those are not autoconfigured hosts, we explicitly avoid such 1821 * cases for safety. 1822 */ 1823 if (do_update && ln->ln_router && !ip6_forwarding && ip6_accept_rtadv) 1824 defrouter_select(); 1825 1826 return rt; 1827 } 1828 1829 static void 1830 nd6_slowtimo(ignored_arg) 1831 void *ignored_arg; 1832 { 1833 int s = splnet(); 1834 int i; 1835 struct nd_ifinfo *nd6if; 1836 1837 callout_reset(&nd6_slowtimo_ch, ND6_SLOWTIMER_INTERVAL * hz, 1838 nd6_slowtimo, NULL); 1839 for (i = 1; i < if_index + 1; i++) { 1840 if (!nd_ifinfo || i >= nd_ifinfo_indexlim) 1841 continue; 1842 nd6if = &nd_ifinfo[i]; 1843 if (nd6if->basereachable && /* already initialized */ 1844 (nd6if->recalctm -= ND6_SLOWTIMER_INTERVAL) <= 0) { 1845 /* 1846 * Since reachable time rarely changes by router 1847 * advertisements, we SHOULD insure that a new random 1848 * value gets recomputed at least once every few hours. 1849 * (RFC 2461, 6.3.4) 1850 */ 1851 nd6if->recalctm = nd6_recalc_reachtm_interval; 1852 nd6if->reachable = ND_COMPUTE_RTIME(nd6if->basereachable); 1853 } 1854 } 1855 splx(s); 1856 } 1857 1858 #define senderr(e) { error = (e); goto bad;} 1859 int 1860 nd6_output(ifp, origifp, m0, dst, rt0) 1861 struct ifnet *ifp; 1862 struct ifnet *origifp; 1863 struct mbuf *m0; 1864 struct sockaddr_in6 *dst; 1865 struct rtentry *rt0; 1866 { 1867 struct mbuf *m = m0; 1868 struct rtentry *rt = rt0; 1869 struct sockaddr_in6 *gw6 = NULL; 1870 struct llinfo_nd6 *ln = NULL; 1871 int error = 0; 1872 1873 if (IN6_IS_ADDR_MULTICAST(&dst->sin6_addr)) 1874 goto sendpkt; 1875 1876 if (nd6_need_cache(ifp) == 0) 1877 goto sendpkt; 1878 1879 /* 1880 * next hop determination. This routine is derived from ether_outpout. 1881 */ 1882 if (rt) { 1883 if ((rt->rt_flags & RTF_UP) == 0) { 1884 if ((rt0 = rt = rtalloc1((struct sockaddr *)dst, 1, 0UL)) != 1885 NULL) 1886 { 1887 rt->rt_refcnt--; 1888 if (rt->rt_ifp != ifp) { 1889 /* XXX: loop care? */ 1890 return nd6_output(ifp, origifp, m0, 1891 dst, rt); 1892 } 1893 } else 1894 senderr(EHOSTUNREACH); 1895 } 1896 1897 if (rt->rt_flags & RTF_GATEWAY) { 1898 gw6 = (struct sockaddr_in6 *)rt->rt_gateway; 1899 1900 /* 1901 * We skip link-layer address resolution and NUD 1902 * if the gateway is not a neighbor from ND point 1903 * of view, regardless of the value of nd_ifinfo.flags. 1904 * The second condition is a bit tricky; we skip 1905 * if the gateway is our own address, which is 1906 * sometimes used to install a route to a p2p link. 1907 */ 1908 if (!nd6_is_addr_neighbor(gw6, ifp) || 1909 in6ifa_ifpwithaddr(ifp, &gw6->sin6_addr)) { 1910 /* 1911 * We allow this kind of tricky route only 1912 * when the outgoing interface is p2p. 1913 * XXX: we may need a more generic rule here. 1914 */ 1915 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 1916 senderr(EHOSTUNREACH); 1917 1918 goto sendpkt; 1919 } 1920 1921 if (rt->rt_gwroute == 0) 1922 goto lookup; 1923 if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) { 1924 rtfree(rt); rt = rt0; 1925 lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1, 0UL); 1926 if ((rt = rt->rt_gwroute) == 0) 1927 senderr(EHOSTUNREACH); 1928 } 1929 } 1930 } 1931 1932 /* 1933 * Address resolution or Neighbor Unreachability Detection 1934 * for the next hop. 1935 * At this point, the destination of the packet must be a unicast 1936 * or an anycast address(i.e. not a multicast). 1937 */ 1938 1939 /* Look up the neighbor cache for the nexthop */ 1940 if (rt && (rt->rt_flags & RTF_LLINFO) != 0) 1941 ln = (struct llinfo_nd6 *)rt->rt_llinfo; 1942 else { 1943 /* 1944 * Since nd6_is_addr_neighbor() internally calls nd6_lookup(), 1945 * the condition below is not very efficient. But we believe 1946 * it is tolerable, because this should be a rare case. 1947 */ 1948 if (nd6_is_addr_neighbor(dst, ifp) && 1949 (rt = nd6_lookup(&dst->sin6_addr, 1, ifp)) != NULL) 1950 ln = (struct llinfo_nd6 *)rt->rt_llinfo; 1951 } 1952 if (!ln || !rt) { 1953 if ((ifp->if_flags & IFF_POINTOPOINT) == 0 && 1954 !(nd_ifinfo[ifp->if_index].flags & ND6_IFF_PERFORMNUD)) { 1955 log(LOG_DEBUG, 1956 "nd6_output: can't allocate llinfo for %s " 1957 "(ln=%p, rt=%p)\n", 1958 ip6_sprintf(&dst->sin6_addr), ln, rt); 1959 senderr(EIO); /* XXX: good error? */ 1960 } 1961 1962 goto sendpkt; /* send anyway */ 1963 } 1964 1965 /* We don't have to do link-layer address resolution on a p2p link. */ 1966 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 && 1967 ln->ln_state < ND6_LLINFO_REACHABLE) { 1968 ln->ln_state = ND6_LLINFO_STALE; 1969 ln->ln_expire = time_second + nd6_gctimer; 1970 } 1971 1972 /* 1973 * The first time we send a packet to a neighbor whose entry is 1974 * STALE, we have to change the state to DELAY and a sets a timer to 1975 * expire in DELAY_FIRST_PROBE_TIME seconds to ensure do 1976 * neighbor unreachability detection on expiration. 1977 * (RFC 2461 7.3.3) 1978 */ 1979 if (ln->ln_state == ND6_LLINFO_STALE) { 1980 ln->ln_asked = 0; 1981 ln->ln_state = ND6_LLINFO_DELAY; 1982 ln->ln_expire = time_second + nd6_delay; 1983 } 1984 1985 /* 1986 * If the neighbor cache entry has a state other than INCOMPLETE 1987 * (i.e. its link-layer address is already resolved), just 1988 * send the packet. 1989 */ 1990 if (ln->ln_state > ND6_LLINFO_INCOMPLETE) 1991 goto sendpkt; 1992 1993 /* 1994 * There is a neighbor cache entry, but no ethernet address 1995 * response yet. Replace the held mbuf (if any) with this 1996 * latest one. 1997 * 1998 * This code conforms to the rate-limiting rule described in Section 1999 * 7.2.2 of RFC 2461, because the timer is set correctly after sending 2000 * an NS below. 2001 */ 2002 if (ln->ln_state == ND6_LLINFO_NOSTATE) 2003 ln->ln_state = ND6_LLINFO_INCOMPLETE; 2004 if (ln->ln_hold) 2005 m_freem(ln->ln_hold); 2006 ln->ln_hold = m; 2007 if (ln->ln_expire) { 2008 if (ln->ln_asked < nd6_mmaxtries && 2009 ln->ln_expire < time_second) { 2010 ln->ln_asked++; 2011 ln->ln_expire = time_second + 2012 nd_ifinfo[ifp->if_index].retrans / 1000; 2013 nd6_ns_output(ifp, NULL, &dst->sin6_addr, ln, 0); 2014 } 2015 } 2016 return(0); 2017 2018 sendpkt: 2019 2020 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 2021 return((*ifp->if_output)(origifp, m, (struct sockaddr *)dst, 2022 rt)); 2023 } 2024 return((*ifp->if_output)(ifp, m, (struct sockaddr *)dst, rt)); 2025 2026 bad: 2027 if (m) 2028 m_freem(m); 2029 return (error); 2030 } 2031 #undef senderr 2032 2033 int 2034 nd6_need_cache(ifp) 2035 struct ifnet *ifp; 2036 { 2037 /* 2038 * XXX: we currently do not make neighbor cache on any interface 2039 * other than ARCnet, Ethernet, FDDI and GIF. 2040 * 2041 * RFC2893 says: 2042 * - unidirectional tunnels needs no ND 2043 */ 2044 switch (ifp->if_type) { 2045 case IFT_ARCNET: 2046 case IFT_ETHER: 2047 case IFT_FDDI: 2048 case IFT_IEEE1394: 2049 #ifdef IFT_L2VLAN 2050 case IFT_L2VLAN: 2051 #endif 2052 #ifdef IFT_IEEE80211 2053 case IFT_IEEE80211: 2054 #endif 2055 case IFT_GIF: /* XXX need more cases? */ 2056 return(1); 2057 default: 2058 return(0); 2059 } 2060 } 2061 2062 int 2063 nd6_storelladdr(ifp, rt, m, dst, desten) 2064 struct ifnet *ifp; 2065 struct rtentry *rt; 2066 struct mbuf *m; 2067 struct sockaddr *dst; 2068 u_char *desten; 2069 { 2070 int i; 2071 struct sockaddr_dl *sdl; 2072 2073 if (m->m_flags & M_MCAST) { 2074 switch (ifp->if_type) { 2075 case IFT_ETHER: 2076 case IFT_FDDI: 2077 #ifdef IFT_L2VLAN 2078 case IFT_L2VLAN: 2079 #endif 2080 #ifdef IFT_IEEE80211 2081 case IFT_IEEE80211: 2082 #endif 2083 ETHER_MAP_IPV6_MULTICAST(&SIN6(dst)->sin6_addr, 2084 desten); 2085 return(1); 2086 case IFT_IEEE1394: 2087 /* 2088 * netbsd can use if_broadcastaddr, but we don't do so 2089 * to reduce # of ifdef. 2090 */ 2091 for (i = 0; i < ifp->if_addrlen; i++) 2092 desten[i] = ~0; 2093 return(1); 2094 case IFT_ARCNET: 2095 *desten = 0; 2096 return(1); 2097 default: 2098 m_freem(m); 2099 return(0); 2100 } 2101 } 2102 2103 if (rt == NULL) { 2104 /* this could happen, if we could not allocate memory */ 2105 m_freem(m); 2106 return(0); 2107 } 2108 if (rt->rt_gateway->sa_family != AF_LINK) { 2109 printf("nd6_storelladdr: something odd happens\n"); 2110 m_freem(m); 2111 return(0); 2112 } 2113 sdl = SDL(rt->rt_gateway); 2114 if (sdl->sdl_alen == 0) { 2115 /* this should be impossible, but we bark here for debugging */ 2116 printf("nd6_storelladdr: sdl_alen == 0\n"); 2117 m_freem(m); 2118 return(0); 2119 } 2120 2121 bcopy(LLADDR(sdl), desten, sdl->sdl_alen); 2122 return(1); 2123 } 2124 2125 static int nd6_sysctl_drlist(SYSCTL_HANDLER_ARGS); 2126 static int nd6_sysctl_prlist(SYSCTL_HANDLER_ARGS); 2127 #ifdef SYSCTL_DECL 2128 SYSCTL_DECL(_net_inet6_icmp6); 2129 #endif 2130 SYSCTL_NODE(_net_inet6_icmp6, ICMPV6CTL_ND6_DRLIST, nd6_drlist, 2131 CTLFLAG_RD, nd6_sysctl_drlist, ""); 2132 SYSCTL_NODE(_net_inet6_icmp6, ICMPV6CTL_ND6_PRLIST, nd6_prlist, 2133 CTLFLAG_RD, nd6_sysctl_prlist, ""); 2134 2135 static int 2136 nd6_sysctl_drlist(SYSCTL_HANDLER_ARGS) 2137 { 2138 int error; 2139 char buf[1024]; 2140 struct in6_defrouter *d, *de; 2141 struct nd_defrouter *dr; 2142 2143 if (req->newptr) 2144 return EPERM; 2145 error = 0; 2146 2147 for (dr = TAILQ_FIRST(&nd_defrouter); 2148 dr; 2149 dr = TAILQ_NEXT(dr, dr_entry)) { 2150 d = (struct in6_defrouter *)buf; 2151 de = (struct in6_defrouter *)(buf + sizeof(buf)); 2152 2153 if (d + 1 <= de) { 2154 bzero(d, sizeof(*d)); 2155 d->rtaddr.sin6_family = AF_INET6; 2156 d->rtaddr.sin6_len = sizeof(d->rtaddr); 2157 if (in6_recoverscope(&d->rtaddr, &dr->rtaddr, 2158 dr->ifp) != 0) 2159 log(LOG_ERR, 2160 "scope error in " 2161 "default router list (%s)\n", 2162 ip6_sprintf(&dr->rtaddr)); 2163 d->flags = dr->flags; 2164 d->rtlifetime = dr->rtlifetime; 2165 d->expire = dr->expire; 2166 d->if_index = dr->ifp->if_index; 2167 } else 2168 panic("buffer too short"); 2169 2170 error = SYSCTL_OUT(req, buf, sizeof(*d)); 2171 if (error) 2172 break; 2173 } 2174 return error; 2175 } 2176 2177 static int 2178 nd6_sysctl_prlist(SYSCTL_HANDLER_ARGS) 2179 { 2180 int error; 2181 char buf[1024]; 2182 struct in6_prefix *p, *pe; 2183 struct nd_prefix *pr; 2184 2185 if (req->newptr) 2186 return EPERM; 2187 error = 0; 2188 2189 for (pr = nd_prefix.lh_first; pr; pr = pr->ndpr_next) { 2190 u_short advrtrs; 2191 size_t advance; 2192 struct sockaddr_in6 *sin6, *s6; 2193 struct nd_pfxrouter *pfr; 2194 2195 p = (struct in6_prefix *)buf; 2196 pe = (struct in6_prefix *)(buf + sizeof(buf)); 2197 2198 if (p + 1 <= pe) { 2199 bzero(p, sizeof(*p)); 2200 sin6 = (struct sockaddr_in6 *)(p + 1); 2201 2202 p->prefix = pr->ndpr_prefix; 2203 if (in6_recoverscope(&p->prefix, 2204 &p->prefix.sin6_addr, pr->ndpr_ifp) != 0) 2205 log(LOG_ERR, 2206 "scope error in prefix list (%s)\n", 2207 ip6_sprintf(&p->prefix.sin6_addr)); 2208 p->raflags = pr->ndpr_raf; 2209 p->prefixlen = pr->ndpr_plen; 2210 p->vltime = pr->ndpr_vltime; 2211 p->pltime = pr->ndpr_pltime; 2212 p->if_index = pr->ndpr_ifp->if_index; 2213 p->expire = pr->ndpr_expire; 2214 p->refcnt = pr->ndpr_refcnt; 2215 p->flags = pr->ndpr_stateflags; 2216 p->origin = PR_ORIG_RA; 2217 advrtrs = 0; 2218 for (pfr = pr->ndpr_advrtrs.lh_first; 2219 pfr; 2220 pfr = pfr->pfr_next) { 2221 if ((void *)&sin6[advrtrs + 1] > 2222 (void *)pe) { 2223 advrtrs++; 2224 continue; 2225 } 2226 s6 = &sin6[advrtrs]; 2227 bzero(s6, sizeof(*s6)); 2228 s6->sin6_family = AF_INET6; 2229 s6->sin6_len = sizeof(*sin6); 2230 if (in6_recoverscope(s6, 2231 &pfr->router->rtaddr, 2232 pfr->router->ifp) != 0) 2233 log(LOG_ERR, 2234 "scope error in " 2235 "prefix list (%s)\n", 2236 ip6_sprintf(&pfr->router->rtaddr)); 2237 advrtrs++; 2238 } 2239 p->advrtrs = advrtrs; 2240 } else 2241 panic("buffer too short"); 2242 2243 advance = sizeof(*p) + sizeof(*sin6) * advrtrs; 2244 error = SYSCTL_OUT(req, buf, advance); 2245 if (error) 2246 break; 2247 } 2248 return error; 2249 } 2250