nd6.c revision 1.48
1 /* $NetBSD: nd6.c,v 1.48 2001/06/27 17:36:14 itojun Exp $ */ 2 /* $KAME: nd6.c,v 1.151 2001/06/19 14:24:41 sumikawa 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 /* 34 * XXX 35 * KAME 970409 note: 36 * BSD/OS version heavily modifies this code, related to llinfo. 37 * Since we don't have BSD/OS version of net/route.c in our hand, 38 * I left the code mostly as it was in 970310. -- itojun 39 */ 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/callout.h> 44 #include <sys/malloc.h> 45 #include <sys/mbuf.h> 46 #include <sys/socket.h> 47 #include <sys/sockio.h> 48 #include <sys/time.h> 49 #include <sys/kernel.h> 50 #include <sys/protosw.h> 51 #include <sys/errno.h> 52 #include <sys/ioctl.h> 53 #include <sys/syslog.h> 54 #include <sys/queue.h> 55 56 #include <net/if.h> 57 #include <net/if_dl.h> 58 #include <net/if_types.h> 59 #include <net/if_atm.h> 60 #include <net/if_ieee1394.h> 61 #include <net/route.h> 62 63 #include <netinet/in.h> 64 #include <net/if_ether.h> 65 #include <netinet/if_inarp.h> 66 #include <net/if_fddi.h> 67 #include <netinet6/in6_var.h> 68 #include <netinet/ip6.h> 69 #include <netinet6/ip6_var.h> 70 #include <netinet6/nd6.h> 71 #include <netinet6/in6_prefix.h> 72 #include <netinet/icmp6.h> 73 74 #include "loop.h" 75 extern struct ifnet loif[NLOOP]; 76 77 #include <net/net_osdep.h> 78 79 #define ND6_SLOWTIMER_INTERVAL (60 * 60) /* 1 hour */ 80 #define ND6_RECALC_REACHTM_INTERVAL (60 * 120) /* 2 hours */ 81 82 #define SIN6(s) ((struct sockaddr_in6 *)s) 83 #define SDL(s) ((struct sockaddr_dl *)s) 84 85 /* timer values */ 86 int nd6_prune = 1; /* walk list every 1 seconds */ 87 int nd6_delay = 5; /* delay first probe time 5 second */ 88 int nd6_umaxtries = 3; /* maximum unicast query */ 89 int nd6_mmaxtries = 3; /* maximum multicast query */ 90 int nd6_useloopback = 1; /* use loopback interface for local traffic */ 91 int nd6_gctimer = (60 * 60 * 24); /* 1 day: garbage collection timer */ 92 93 /* preventing too many loops in ND option parsing */ 94 int nd6_maxndopt = 10; /* max # of ND options allowed */ 95 96 int nd6_maxnudhint = 0; /* max # of subsequent upper layer hints */ 97 98 #ifdef ND6_DEBUG 99 int nd6_debug = 1; 100 #else 101 int nd6_debug = 0; 102 #endif 103 104 /* for debugging? */ 105 static int nd6_inuse, nd6_allocated; 106 107 struct llinfo_nd6 llinfo_nd6 = {&llinfo_nd6, &llinfo_nd6}; 108 static size_t nd_ifinfo_indexlim = 8; 109 struct nd_ifinfo *nd_ifinfo = NULL; 110 struct nd_drhead nd_defrouter; 111 struct nd_prhead nd_prefix = { 0 }; 112 113 int nd6_recalc_reachtm_interval = ND6_RECALC_REACHTM_INTERVAL; 114 static struct sockaddr_in6 all1_sa; 115 116 static void nd6_slowtimo __P((void *)); 117 118 struct callout nd6_slowtimo_ch; 119 struct callout nd6_timer_ch; 120 121 void 122 nd6_init() 123 { 124 static int nd6_init_done = 0; 125 int i; 126 127 if (nd6_init_done) { 128 log(LOG_NOTICE, "nd6_init called more than once(ignored)\n"); 129 return; 130 } 131 132 all1_sa.sin6_family = AF_INET6; 133 all1_sa.sin6_len = sizeof(struct sockaddr_in6); 134 for (i = 0; i < sizeof(all1_sa.sin6_addr); i++) 135 all1_sa.sin6_addr.s6_addr[i] = 0xff; 136 137 /* initialization of the default router list */ 138 TAILQ_INIT(&nd_defrouter); 139 140 nd6_init_done = 1; 141 142 /* start timer */ 143 callout_reset(&nd6_slowtimo_ch, ND6_SLOWTIMER_INTERVAL * hz, 144 nd6_slowtimo, NULL); 145 } 146 147 void 148 nd6_ifattach(ifp) 149 struct ifnet *ifp; 150 { 151 152 /* 153 * We have some arrays that should be indexed by if_index. 154 * since if_index will grow dynamically, they should grow too. 155 */ 156 if (nd_ifinfo == NULL || if_index >= nd_ifinfo_indexlim) { 157 size_t n; 158 caddr_t q; 159 160 while (if_index >= nd_ifinfo_indexlim) 161 nd_ifinfo_indexlim <<= 1; 162 163 /* grow nd_ifinfo */ 164 n = nd_ifinfo_indexlim * sizeof(struct nd_ifinfo); 165 q = (caddr_t)malloc(n, M_IP6NDP, M_WAITOK); 166 bzero(q, n); 167 if (nd_ifinfo) { 168 bcopy((caddr_t)nd_ifinfo, q, n/2); 169 free((caddr_t)nd_ifinfo, M_IP6NDP); 170 } 171 nd_ifinfo = (struct nd_ifinfo *)q; 172 } 173 174 #define ND nd_ifinfo[ifp->if_index] 175 176 /* 177 * Don't initialize if called twice. 178 * XXX: to detect this, we should choose a member that is never set 179 * before initialization of the ND structure itself. We formaly used 180 * the linkmtu member, which was not suitable because it could be 181 * initialized via "ifconfig mtu". 182 */ 183 if (ND.basereachable) 184 return; 185 186 ND.linkmtu = ifindex2ifnet[ifp->if_index]->if_mtu; 187 ND.chlim = IPV6_DEFHLIM; 188 ND.basereachable = REACHABLE_TIME; 189 ND.reachable = ND_COMPUTE_RTIME(ND.basereachable); 190 ND.retrans = RETRANS_TIMER; 191 ND.receivedra = 0; 192 ND.flags = ND6_IFF_PERFORMNUD; 193 nd6_setmtu(ifp); 194 #undef ND 195 } 196 197 /* 198 * Reset ND level link MTU. This function is called when the physical MTU 199 * changes, which means we might have to adjust the ND level MTU. 200 */ 201 void 202 nd6_setmtu(ifp) 203 struct ifnet *ifp; 204 { 205 struct nd_ifinfo *ndi = &nd_ifinfo[ifp->if_index]; 206 u_long oldmaxmtu = ndi->maxmtu; 207 u_long oldlinkmtu = ndi->linkmtu; 208 209 switch (ifp->if_type) { 210 case IFT_ARCNET: /* XXX MTU handling needs more work */ 211 ndi->maxmtu = MIN(60480, ifp->if_mtu); 212 break; 213 case IFT_ETHER: 214 ndi->maxmtu = MIN(ETHERMTU, ifp->if_mtu); 215 break; 216 case IFT_ATM: 217 ndi->maxmtu = MIN(ATMMTU, ifp->if_mtu); 218 break; 219 case IFT_IEEE1394: 220 ndi->maxmtu = MIN(IEEE1394MTU, ifp->if_mtu); 221 break; 222 default: 223 ndi->maxmtu = ifp->if_mtu; 224 break; 225 } 226 227 if (oldmaxmtu != ndi->maxmtu) { 228 /* 229 * If the ND level MTU is not set yet, or if the maxmtu 230 * is reset to a smaller value than the ND level MTU, 231 * also reset the ND level MTU. 232 */ 233 if (ndi->linkmtu == 0 || 234 ndi->maxmtu < ndi->linkmtu) { 235 ndi->linkmtu = ndi->maxmtu; 236 /* also adjust in6_maxmtu if necessary. */ 237 if (oldlinkmtu == 0) { 238 /* 239 * XXX: the case analysis is grotty, but 240 * it is not efficient to call in6_setmaxmtu() 241 * here when we are during the initialization 242 * procedure. 243 */ 244 if (in6_maxmtu < ndi->linkmtu) 245 in6_maxmtu = ndi->linkmtu; 246 } else 247 in6_setmaxmtu(); 248 } 249 } 250 #undef MIN 251 } 252 253 void 254 nd6_option_init(opt, icmp6len, ndopts) 255 void *opt; 256 int icmp6len; 257 union nd_opts *ndopts; 258 { 259 bzero(ndopts, sizeof(*ndopts)); 260 ndopts->nd_opts_search = (struct nd_opt_hdr *)opt; 261 ndopts->nd_opts_last 262 = (struct nd_opt_hdr *)(((u_char *)opt) + icmp6len); 263 264 if (icmp6len == 0) { 265 ndopts->nd_opts_done = 1; 266 ndopts->nd_opts_search = NULL; 267 } 268 } 269 270 /* 271 * Take one ND option. 272 */ 273 struct nd_opt_hdr * 274 nd6_option(ndopts) 275 union nd_opts *ndopts; 276 { 277 struct nd_opt_hdr *nd_opt; 278 int olen; 279 280 if (!ndopts) 281 panic("ndopts == NULL in nd6_option\n"); 282 if (!ndopts->nd_opts_last) 283 panic("uninitialized ndopts in nd6_option\n"); 284 if (!ndopts->nd_opts_search) 285 return NULL; 286 if (ndopts->nd_opts_done) 287 return NULL; 288 289 nd_opt = ndopts->nd_opts_search; 290 291 /* make sure nd_opt_len is inside the buffer */ 292 if ((caddr_t)&nd_opt->nd_opt_len >= (caddr_t)ndopts->nd_opts_last) { 293 bzero(ndopts, sizeof(*ndopts)); 294 return NULL; 295 } 296 297 olen = nd_opt->nd_opt_len << 3; 298 if (olen == 0) { 299 /* 300 * Message validation requires that all included 301 * options have a length that is greater than zero. 302 */ 303 bzero(ndopts, sizeof(*ndopts)); 304 return NULL; 305 } 306 307 ndopts->nd_opts_search = (struct nd_opt_hdr *)((caddr_t)nd_opt + olen); 308 if (ndopts->nd_opts_search > ndopts->nd_opts_last) { 309 /* option overruns the end of buffer, invalid */ 310 bzero(ndopts, sizeof(*ndopts)); 311 return NULL; 312 } else if (ndopts->nd_opts_search == ndopts->nd_opts_last) { 313 /* reached the end of options chain */ 314 ndopts->nd_opts_done = 1; 315 ndopts->nd_opts_search = NULL; 316 } 317 return nd_opt; 318 } 319 320 /* 321 * Parse multiple ND options. 322 * This function is much easier to use, for ND routines that do not need 323 * multiple options of the same type. 324 */ 325 int 326 nd6_options(ndopts) 327 union nd_opts *ndopts; 328 { 329 struct nd_opt_hdr *nd_opt; 330 int i = 0; 331 332 if (!ndopts) 333 panic("ndopts == NULL in nd6_options\n"); 334 if (!ndopts->nd_opts_last) 335 panic("uninitialized ndopts in nd6_options\n"); 336 if (!ndopts->nd_opts_search) 337 return 0; 338 339 while (1) { 340 nd_opt = nd6_option(ndopts); 341 if (!nd_opt && !ndopts->nd_opts_last) { 342 /* 343 * Message validation requires that all included 344 * options have a length that is greater than zero. 345 */ 346 icmp6stat.icp6s_nd_badopt++; 347 bzero(ndopts, sizeof(*ndopts)); 348 return -1; 349 } 350 351 if (!nd_opt) 352 goto skip1; 353 354 switch (nd_opt->nd_opt_type) { 355 case ND_OPT_SOURCE_LINKADDR: 356 case ND_OPT_TARGET_LINKADDR: 357 case ND_OPT_MTU: 358 case ND_OPT_REDIRECTED_HEADER: 359 if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) { 360 nd6log((LOG_INFO, 361 "duplicated ND6 option found (type=%d)\n", 362 nd_opt->nd_opt_type)); 363 /* XXX bark? */ 364 } else { 365 ndopts->nd_opt_array[nd_opt->nd_opt_type] 366 = nd_opt; 367 } 368 break; 369 case ND_OPT_PREFIX_INFORMATION: 370 if (ndopts->nd_opt_array[nd_opt->nd_opt_type] == 0) { 371 ndopts->nd_opt_array[nd_opt->nd_opt_type] 372 = nd_opt; 373 } 374 ndopts->nd_opts_pi_end = 375 (struct nd_opt_prefix_info *)nd_opt; 376 break; 377 default: 378 /* 379 * Unknown options must be silently ignored, 380 * to accomodate future extension to the protocol. 381 */ 382 nd6log((LOG_DEBUG, 383 "nd6_options: unsupported option %d - " 384 "option ignored\n", nd_opt->nd_opt_type)); 385 } 386 387 skip1: 388 i++; 389 if (i > nd6_maxndopt) { 390 icmp6stat.icp6s_nd_toomanyopt++; 391 nd6log((LOG_INFO, "too many loop in nd opt\n")); 392 break; 393 } 394 395 if (ndopts->nd_opts_done) 396 break; 397 } 398 399 return 0; 400 } 401 402 /* 403 * ND6 timer routine to expire default route list and prefix list 404 */ 405 void 406 nd6_timer(ignored_arg) 407 void *ignored_arg; 408 { 409 int s; 410 struct llinfo_nd6 *ln; 411 struct nd_defrouter *dr; 412 struct nd_prefix *pr; 413 long time_second = time.tv_sec; 414 415 s = splsoftnet(); 416 callout_reset(&nd6_timer_ch, nd6_prune * hz, 417 nd6_timer, NULL); 418 419 ln = llinfo_nd6.ln_next; 420 /* XXX BSD/OS separates this code -- itojun */ 421 while (ln && ln != &llinfo_nd6) { 422 struct rtentry *rt; 423 struct ifnet *ifp; 424 struct sockaddr_in6 *dst; 425 struct llinfo_nd6 *next = ln->ln_next; 426 /* XXX: used for the DELAY case only: */ 427 struct nd_ifinfo *ndi = NULL; 428 429 if ((rt = ln->ln_rt) == NULL) { 430 ln = next; 431 continue; 432 } 433 if ((ifp = rt->rt_ifp) == NULL) { 434 ln = next; 435 continue; 436 } 437 ndi = &nd_ifinfo[ifp->if_index]; 438 dst = (struct sockaddr_in6 *)rt_key(rt); 439 440 if (ln->ln_expire > time_second) { 441 ln = next; 442 continue; 443 } 444 445 /* sanity check */ 446 if (!rt) 447 panic("rt=0 in nd6_timer(ln=%p)\n", ln); 448 if (rt->rt_llinfo && (struct llinfo_nd6 *)rt->rt_llinfo != ln) 449 panic("rt_llinfo(%p) is not equal to ln(%p)\n", 450 rt->rt_llinfo, ln); 451 if (!dst) 452 panic("dst=0 in nd6_timer(ln=%p)\n", ln); 453 454 switch (ln->ln_state) { 455 case ND6_LLINFO_INCOMPLETE: 456 if (ln->ln_asked < nd6_mmaxtries) { 457 ln->ln_asked++; 458 ln->ln_expire = time_second + 459 nd_ifinfo[ifp->if_index].retrans / 1000; 460 nd6_ns_output(ifp, NULL, &dst->sin6_addr, 461 ln, 0); 462 } else { 463 struct mbuf *m = ln->ln_hold; 464 if (m) { 465 if (rt->rt_ifp) { 466 /* 467 * Fake rcvif to make ICMP error 468 * more helpful in diagnosing 469 * for the receiver. 470 * XXX: should we consider 471 * older rcvif? 472 */ 473 m->m_pkthdr.rcvif = rt->rt_ifp; 474 } 475 icmp6_error(m, ICMP6_DST_UNREACH, 476 ICMP6_DST_UNREACH_ADDR, 0); 477 ln->ln_hold = NULL; 478 } 479 next = nd6_free(rt); 480 } 481 break; 482 case ND6_LLINFO_REACHABLE: 483 if (ln->ln_expire) { 484 ln->ln_state = ND6_LLINFO_STALE; 485 ln->ln_expire = time_second + nd6_gctimer; 486 } 487 break; 488 489 case ND6_LLINFO_STALE: 490 /* Garbage Collection(RFC 2461 5.3) */ 491 if (ln->ln_expire) 492 next = nd6_free(rt); 493 break; 494 495 case ND6_LLINFO_DELAY: 496 if (ndi && (ndi->flags & ND6_IFF_PERFORMNUD) != 0) { 497 /* We need NUD */ 498 ln->ln_asked = 1; 499 ln->ln_state = ND6_LLINFO_PROBE; 500 ln->ln_expire = time_second + 501 ndi->retrans / 1000; 502 nd6_ns_output(ifp, &dst->sin6_addr, 503 &dst->sin6_addr, 504 ln, 0); 505 } else { 506 ln->ln_state = ND6_LLINFO_STALE; /* XXX */ 507 ln->ln_expire = time_second + nd6_gctimer; 508 } 509 break; 510 case ND6_LLINFO_PROBE: 511 if (ln->ln_asked < nd6_umaxtries) { 512 ln->ln_asked++; 513 ln->ln_expire = time_second + 514 nd_ifinfo[ifp->if_index].retrans / 1000; 515 nd6_ns_output(ifp, &dst->sin6_addr, 516 &dst->sin6_addr, ln, 0); 517 } else 518 next = nd6_free(rt); 519 break; 520 } 521 ln = next; 522 } 523 524 /* expire default router list */ 525 dr = TAILQ_FIRST(&nd_defrouter); 526 while (dr) { 527 if (dr->expire && dr->expire < time_second) { 528 struct nd_defrouter *t; 529 t = TAILQ_NEXT(dr, dr_entry); 530 defrtrlist_del(dr); 531 dr = t; 532 } else { 533 dr = TAILQ_NEXT(dr, dr_entry); 534 } 535 } 536 pr = nd_prefix.lh_first; 537 while (pr) { 538 struct in6_ifaddr *ia6; 539 struct in6_addrlifetime *lt6; 540 541 if (IN6_IS_ADDR_UNSPECIFIED(&pr->ndpr_addr)) 542 ia6 = NULL; 543 else 544 ia6 = in6ifa_ifpwithaddr(pr->ndpr_ifp, &pr->ndpr_addr); 545 546 if (ia6) { 547 /* check address lifetime */ 548 lt6 = &ia6->ia6_lifetime; 549 if (lt6->ia6t_preferred && lt6->ia6t_preferred < time_second) 550 ia6->ia6_flags |= IN6_IFF_DEPRECATED; 551 if (lt6->ia6t_expire && lt6->ia6t_expire < time_second) { 552 if (!IN6_IS_ADDR_UNSPECIFIED(&pr->ndpr_addr)) 553 in6_ifdel(pr->ndpr_ifp, &pr->ndpr_addr); 554 /* xxx ND_OPT_PI_FLAG_ONLINK processing */ 555 } 556 } 557 558 /* 559 * check prefix lifetime. 560 * since pltime is just for autoconf, pltime processing for 561 * prefix is not necessary. 562 * 563 * we offset expire time by NDPR_KEEP_EXPIRE, so that we 564 * can use the old prefix information to validate the 565 * next prefix information to come. See prelist_update() 566 * for actual validation. 567 */ 568 if (pr->ndpr_expire 569 && pr->ndpr_expire + NDPR_KEEP_EXPIRED < time_second) { 570 struct nd_prefix *t; 571 t = pr->ndpr_next; 572 573 /* 574 * address expiration and prefix expiration are 575 * separate. NEVER perform in6_ifdel here. 576 */ 577 578 prelist_remove(pr); 579 pr = t; 580 } else 581 pr = pr->ndpr_next; 582 } 583 splx(s); 584 } 585 586 /* 587 * Nuke neighbor cache/prefix/default router management table, right before 588 * ifp goes away. 589 */ 590 void 591 nd6_purge(ifp) 592 struct ifnet *ifp; 593 { 594 struct llinfo_nd6 *ln, *nln; 595 struct nd_defrouter *dr, *ndr, drany; 596 struct nd_prefix *pr, *npr; 597 598 /* Nuke default router list entries toward ifp */ 599 if ((dr = TAILQ_FIRST(&nd_defrouter)) != NULL) { 600 /* 601 * The first entry of the list may be stored in 602 * the routing table, so we'll delete it later. 603 */ 604 for (dr = TAILQ_NEXT(dr, dr_entry); dr; dr = ndr) { 605 ndr = TAILQ_NEXT(dr, dr_entry); 606 if (dr->ifp == ifp) 607 defrtrlist_del(dr); 608 } 609 dr = TAILQ_FIRST(&nd_defrouter); 610 if (dr->ifp == ifp) 611 defrtrlist_del(dr); 612 } 613 614 /* Nuke prefix list entries toward ifp */ 615 for (pr = nd_prefix.lh_first; pr; pr = npr) { 616 npr = pr->ndpr_next; 617 if (pr->ndpr_ifp == ifp) { 618 if (!IN6_IS_ADDR_UNSPECIFIED(&pr->ndpr_addr)) 619 in6_ifdel(pr->ndpr_ifp, &pr->ndpr_addr); 620 prelist_remove(pr); 621 } 622 } 623 624 /* cancel default outgoing interface setting */ 625 if (nd6_defifindex == ifp->if_index) 626 nd6_setdefaultiface(0); 627 628 if (!ip6_forwarding && ip6_accept_rtadv) { /* XXX: too restrictive? */ 629 /* refresh default router list */ 630 bzero(&drany, sizeof(drany)); 631 defrouter_delreq(&drany, 0); 632 defrouter_select(); 633 } 634 635 /* 636 * Nuke neighbor cache entries for the ifp. 637 * Note that rt->rt_ifp may not be the same as ifp, 638 * due to KAME goto ours hack. See RTM_RESOLVE case in 639 * nd6_rtrequest(), and ip6_input(). 640 */ 641 ln = llinfo_nd6.ln_next; 642 while (ln && ln != &llinfo_nd6) { 643 struct rtentry *rt; 644 struct sockaddr_dl *sdl; 645 646 nln = ln->ln_next; 647 rt = ln->ln_rt; 648 if (rt && rt->rt_gateway && 649 rt->rt_gateway->sa_family == AF_LINK) { 650 sdl = (struct sockaddr_dl *)rt->rt_gateway; 651 if (sdl->sdl_index == ifp->if_index) 652 nln = nd6_free(rt); 653 } 654 ln = nln; 655 } 656 } 657 658 struct rtentry * 659 nd6_lookup(addr6, create, ifp) 660 struct in6_addr *addr6; 661 int create; 662 struct ifnet *ifp; 663 { 664 struct rtentry *rt; 665 struct sockaddr_in6 sin6; 666 667 bzero(&sin6, sizeof(sin6)); 668 sin6.sin6_len = sizeof(struct sockaddr_in6); 669 sin6.sin6_family = AF_INET6; 670 sin6.sin6_addr = *addr6; 671 rt = rtalloc1((struct sockaddr *)&sin6, create); 672 if (rt && (rt->rt_flags & RTF_LLINFO) == 0) { 673 /* 674 * This is the case for the default route. 675 * If we want to create a neighbor cache for the address, we 676 * should free the route for the destination and allocate an 677 * interface route. 678 */ 679 if (create) { 680 RTFREE(rt); 681 rt = 0; 682 } 683 } 684 if (!rt) { 685 if (create && ifp) { 686 int e; 687 688 /* 689 * If no route is available and create is set, 690 * we allocate a host route for the destination 691 * and treat it like an interface route. 692 * This hack is necessary for a neighbor which can't 693 * be covered by our own prefix. 694 */ 695 struct ifaddr *ifa = 696 ifaof_ifpforaddr((struct sockaddr *)&sin6, ifp); 697 if (ifa == NULL) 698 return(NULL); 699 700 /* 701 * Create a new route. RTF_LLINFO is necessary 702 * to create a Neighbor Cache entry for the 703 * destination in nd6_rtrequest which will be 704 * called in rtequest via ifa->ifa_rtrequest. 705 */ 706 if ((e = rtrequest(RTM_ADD, (struct sockaddr *)&sin6, 707 ifa->ifa_addr, 708 (struct sockaddr *)&all1_sa, 709 (ifa->ifa_flags | 710 RTF_HOST | RTF_LLINFO) & 711 ~RTF_CLONING, 712 &rt)) != 0) 713 log(LOG_ERR, 714 "nd6_lookup: failed to add route for a " 715 "neighbor(%s), errno=%d\n", 716 ip6_sprintf(addr6), e); 717 if (rt == NULL) 718 return(NULL); 719 if (rt->rt_llinfo) { 720 struct llinfo_nd6 *ln = 721 (struct llinfo_nd6 *)rt->rt_llinfo; 722 ln->ln_state = ND6_LLINFO_NOSTATE; 723 } 724 } else 725 return(NULL); 726 } 727 rt->rt_refcnt--; 728 /* 729 * Validation for the entry. 730 * XXX: we can't use rt->rt_ifp to check for the interface, since 731 * it might be the loopback interface if the entry is for our 732 * own address on a non-loopback interface. Instead, we should 733 * use rt->rt_ifa->ifa_ifp, which would specify the REAL interface. 734 */ 735 if ((rt->rt_flags & RTF_GATEWAY) || (rt->rt_flags & RTF_LLINFO) == 0 || 736 rt->rt_gateway->sa_family != AF_LINK || 737 (ifp && rt->rt_ifa->ifa_ifp != ifp)) { 738 if (create) { 739 log(LOG_DEBUG, "nd6_lookup: failed to lookup %s (if = %s)\n", 740 ip6_sprintf(addr6), ifp ? if_name(ifp) : "unspec"); 741 /* xxx more logs... kazu */ 742 } 743 return(0); 744 } 745 return(rt); 746 } 747 748 /* 749 * Detect if a given IPv6 address identifies a neighbor on a given link. 750 * XXX: should take care of the destination of a p2p link? 751 */ 752 int 753 nd6_is_addr_neighbor(addr, ifp) 754 struct sockaddr_in6 *addr; 755 struct ifnet *ifp; 756 { 757 struct ifaddr *ifa; 758 int i; 759 760 #define IFADDR6(a) ((((struct in6_ifaddr *)(a))->ia_addr).sin6_addr) 761 #define IFMASK6(a) ((((struct in6_ifaddr *)(a))->ia_prefixmask).sin6_addr) 762 763 /* 764 * A link-local address is always a neighbor. 765 * XXX: we should use the sin6_scope_id field rather than the embedded 766 * interface index. 767 */ 768 if (IN6_IS_ADDR_LINKLOCAL(&addr->sin6_addr) && 769 ntohs(*(u_int16_t *)&addr->sin6_addr.s6_addr[2]) == ifp->if_index) 770 return(1); 771 772 /* 773 * If the address matches one of our addresses, 774 * it should be a neighbor. 775 */ 776 for (ifa = ifp->if_addrlist.tqh_first; 777 ifa; 778 ifa = ifa->ifa_list.tqe_next) 779 { 780 if (ifa->ifa_addr->sa_family != AF_INET6) 781 next: continue; 782 783 for (i = 0; i < 4; i++) { 784 if ((IFADDR6(ifa).s6_addr32[i] ^ 785 addr->sin6_addr.s6_addr32[i]) & 786 IFMASK6(ifa).s6_addr32[i]) 787 goto next; 788 } 789 return(1); 790 } 791 792 /* 793 * Even if the address matches none of our addresses, it might be 794 * in the neighbor cache. 795 */ 796 if (nd6_lookup(&addr->sin6_addr, 0, ifp)) 797 return(1); 798 799 return(0); 800 #undef IFADDR6 801 #undef IFMASK6 802 } 803 804 /* 805 * Free an nd6 llinfo entry. 806 */ 807 struct llinfo_nd6 * 808 nd6_free(rt) 809 struct rtentry *rt; 810 { 811 struct llinfo_nd6 *ln = (struct llinfo_nd6 *)rt->rt_llinfo, *next; 812 struct in6_addr in6 = ((struct sockaddr_in6 *)rt_key(rt))->sin6_addr; 813 struct nd_defrouter *dr; 814 815 /* 816 * Clear all destination cache entries for the neighbor. 817 * XXX: is it better to restrict this to hosts? 818 */ 819 pfctlinput(PRC_HOSTDEAD, rt_key(rt)); 820 821 if (!ip6_forwarding && ip6_accept_rtadv) { /* XXX: too restrictive? */ 822 int s; 823 s = splsoftnet(); 824 dr = defrouter_lookup(&((struct sockaddr_in6 *)rt_key(rt))->sin6_addr, 825 rt->rt_ifp); 826 if (ln->ln_router || dr) { 827 /* 828 * rt6_flush must be called whether or not the neighbor 829 * is in the Default Router List. 830 * See a corresponding comment in nd6_na_input(). 831 */ 832 rt6_flush(&in6, rt->rt_ifp); 833 } 834 835 if (dr) { 836 /* 837 * Unreachablity of a router might affect the default 838 * router selection and on-link detection of advertised 839 * prefixes. 840 */ 841 842 /* 843 * Temporarily fake the state to choose a new default 844 * router and to perform on-link determination of 845 * prefixes coreectly. 846 * Below the state will be set correctly, 847 * or the entry itself will be deleted. 848 */ 849 ln->ln_state = ND6_LLINFO_INCOMPLETE; 850 851 if (dr == TAILQ_FIRST(&nd_defrouter)) { 852 /* 853 * It is used as the current default router, 854 * so we have to move it to the end of the 855 * list and choose a new one. 856 * XXX: it is not very efficient if this is 857 * the only router. 858 */ 859 TAILQ_REMOVE(&nd_defrouter, dr, dr_entry); 860 TAILQ_INSERT_TAIL(&nd_defrouter, dr, dr_entry); 861 862 defrouter_select(); 863 } 864 pfxlist_onlink_check(); 865 } 866 splx(s); 867 } 868 869 /* 870 * Before deleting the entry, remember the next entry as the 871 * return value. We need this because pfxlist_onlink_check() above 872 * might have freed other entries (particularly the old next entry) as 873 * a side effect (XXX). 874 */ 875 next = ln->ln_next; 876 877 /* 878 * Detach the route from the routing tree and the list of neighbor 879 * caches, and disable the route entry not to be used in already 880 * cached routes. 881 */ 882 rtrequest(RTM_DELETE, rt_key(rt), (struct sockaddr *)0, 883 rt_mask(rt), 0, (struct rtentry **)0); 884 885 return(next); 886 } 887 888 /* 889 * Upper-layer reachability hint for Neighbor Unreachability Detection. 890 * 891 * XXX cost-effective metods? 892 */ 893 void 894 nd6_nud_hint(rt, dst6, force) 895 struct rtentry *rt; 896 struct in6_addr *dst6; 897 int force; 898 { 899 struct llinfo_nd6 *ln; 900 long time_second = time.tv_sec; 901 902 /* 903 * If the caller specified "rt", use that. Otherwise, resolve the 904 * routing table by supplied "dst6". 905 */ 906 if (!rt) { 907 if (!dst6) 908 return; 909 if (!(rt = nd6_lookup(dst6, 0, NULL))) 910 return; 911 } 912 913 if ((rt->rt_flags & RTF_GATEWAY) != 0 || 914 (rt->rt_flags & RTF_LLINFO) == 0 || 915 !rt->rt_llinfo || !rt->rt_gateway || 916 rt->rt_gateway->sa_family != AF_LINK) { 917 /* This is not a host route. */ 918 return; 919 } 920 921 ln = (struct llinfo_nd6 *)rt->rt_llinfo; 922 if (ln->ln_state < ND6_LLINFO_REACHABLE) 923 return; 924 925 /* 926 * if we get upper-layer reachability confirmation many times, 927 * it is possible we have false information. 928 */ 929 if (!force) { 930 ln->ln_byhint++; 931 if (ln->ln_byhint > nd6_maxnudhint) 932 return; 933 } 934 935 ln->ln_state = ND6_LLINFO_REACHABLE; 936 if (ln->ln_expire) 937 ln->ln_expire = time_second + 938 nd_ifinfo[rt->rt_ifp->if_index].reachable; 939 } 940 941 #ifdef OLDIP6OUTPUT 942 /* 943 * Resolve an IP6 address into an ethernet address. If success, 944 * desten is filled in. If there is no entry in ndptab, 945 * set one up and multicast a solicitation for the IP6 address. 946 * Hold onto this mbuf and resend it once the address 947 * is finally resolved. A return value of 1 indicates 948 * that desten has been filled in and the packet should be sent 949 * normally; a 0 return indicates that the packet has been 950 * taken over here, either now or for later transmission. 951 */ 952 int 953 nd6_resolve(ifp, rt, m, dst, desten) 954 struct ifnet *ifp; 955 struct rtentry *rt; 956 struct mbuf *m; 957 struct sockaddr *dst; 958 u_char *desten; 959 { 960 struct llinfo_nd6 *ln = (struct llinfo_nd6 *)NULL; 961 struct sockaddr_dl *sdl; 962 long time_second = time.tv_sec; 963 964 if (m->m_flags & M_MCAST) { 965 switch (ifp->if_type) { 966 case IFT_ETHER: 967 case IFT_FDDI: 968 ETHER_MAP_IPV6_MULTICAST(&SIN6(dst)->sin6_addr, 969 desten); 970 return(1); 971 case IFT_IEEE1394: 972 bcopy(ifp->if_broadcastaddr, desten, ifp->if_addrlen); 973 return(1); 974 case IFT_ARCNET: 975 *desten = 0; 976 return(1); 977 default: 978 m_freem(m); 979 return(0); 980 } 981 } 982 if (rt && (rt->rt_flags & RTF_LLINFO) != 0) 983 ln = (struct llinfo_nd6 *)rt->rt_llinfo; 984 else { 985 if ((rt = nd6_lookup(&(SIN6(dst)->sin6_addr), 1, ifp)) != NULL) 986 ln = (struct llinfo_nd6 *)rt->rt_llinfo; 987 } 988 if (!ln || !rt) { 989 log(LOG_DEBUG, "nd6_resolve: can't allocate llinfo for %s\n", 990 ip6_sprintf(&(SIN6(dst)->sin6_addr))); 991 m_freem(m); 992 return(0); 993 } 994 sdl = SDL(rt->rt_gateway); 995 /* 996 * Ckeck the address family and length is valid, the address 997 * is resolved; otherwise, try to resolve. 998 */ 999 if (ln->ln_state >= ND6_LLINFO_REACHABLE 1000 && sdl->sdl_family == AF_LINK 1001 && sdl->sdl_alen != 0) { 1002 bcopy(LLADDR(sdl), desten, sdl->sdl_alen); 1003 if (ln->ln_state == ND6_LLINFO_STALE) { 1004 ln->ln_asked = 0; 1005 ln->ln_state = ND6_LLINFO_DELAY; 1006 ln->ln_expire = time_second + nd6_delay; 1007 } 1008 return(1); 1009 } 1010 /* 1011 * There is an ndp entry, but no ethernet address 1012 * response yet. Replace the held mbuf with this 1013 * latest one. 1014 * 1015 * XXX Does the code conform to rate-limiting rule? 1016 * (RFC 2461 7.2.2) 1017 */ 1018 if (ln->ln_state == ND6_LLINFO_NOSTATE) 1019 ln->ln_state = ND6_LLINFO_INCOMPLETE; 1020 if (ln->ln_hold) 1021 m_freem(ln->ln_hold); 1022 ln->ln_hold = m; 1023 if (ln->ln_expire) { 1024 if (ln->ln_asked < nd6_mmaxtries && 1025 ln->ln_expire < time_second) { 1026 ln->ln_asked++; 1027 ln->ln_expire = time_second + 1028 nd_ifinfo[ifp->if_index].retrans / 1000; 1029 nd6_ns_output(ifp, NULL, &(SIN6(dst)->sin6_addr), 1030 ln, 0); 1031 } 1032 } 1033 /* do not free mbuf here, it is queued into llinfo_nd6 */ 1034 return(0); 1035 } 1036 #endif /* OLDIP6OUTPUT */ 1037 1038 void 1039 nd6_rtrequest(req, rt, info) 1040 int req; 1041 struct rtentry *rt; 1042 struct rt_addrinfo *info; /* xxx unused */ 1043 { 1044 struct sockaddr *gate = rt->rt_gateway; 1045 struct llinfo_nd6 *ln = (struct llinfo_nd6 *)rt->rt_llinfo; 1046 static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK}; 1047 struct ifnet *ifp = rt->rt_ifp; 1048 struct ifaddr *ifa; 1049 long time_second = time.tv_sec; 1050 1051 if (rt->rt_flags & RTF_GATEWAY) 1052 return; 1053 1054 switch (req) { 1055 case RTM_ADD: 1056 /* 1057 * There is no backward compatibility :) 1058 * 1059 * if ((rt->rt_flags & RTF_HOST) == 0 && 1060 * SIN(rt_mask(rt))->sin_addr.s_addr != 0xffffffff) 1061 * rt->rt_flags |= RTF_CLONING; 1062 */ 1063 if (rt->rt_flags & (RTF_CLONING | RTF_LLINFO)) { 1064 /* 1065 * Case 1: This route should come from 1066 * a route to interface. RTF_LLINFO flag is set 1067 * for a host route whose destination should be 1068 * treated as on-link. 1069 */ 1070 rt_setgate(rt, rt_key(rt), 1071 (struct sockaddr *)&null_sdl); 1072 gate = rt->rt_gateway; 1073 SDL(gate)->sdl_type = ifp->if_type; 1074 SDL(gate)->sdl_index = ifp->if_index; 1075 if (ln) 1076 ln->ln_expire = time_second; 1077 #if 1 1078 if (ln && ln->ln_expire == 0) { 1079 /* kludge for desktops */ 1080 #if 0 1081 printf("nd6_request: time.tv_sec is zero; " 1082 "treat it as 1\n"); 1083 #endif 1084 ln->ln_expire = 1; 1085 } 1086 #endif 1087 if (rt->rt_flags & RTF_CLONING) 1088 break; 1089 } 1090 /* 1091 * In IPv4 code, we try to annonuce new RTF_ANNOUNCE entry here. 1092 * We don't do that here since llinfo is not ready yet. 1093 * 1094 * There are also couple of other things to be discussed: 1095 * - unsolicited NA code needs improvement beforehand 1096 * - RFC2461 says we MAY send multicast unsolicited NA 1097 * (7.2.6 paragraph 4), however, it also says that we 1098 * SHOULD provide a mechanism to prevent multicast NA storm. 1099 * we don't have anything like it right now. 1100 * note that the mechanism needs a mutual agreement 1101 * between proxies, which means that we need to implement 1102 * a new protocol, or a new kludge. 1103 * - from RFC2461 6.2.4, host MUST NOT send an unsolicited NA. 1104 * we need to check ip6forwarding before sending it. 1105 * (or should we allow proxy ND configuration only for 1106 * routers? there's no mention about proxy ND from hosts) 1107 */ 1108 #if 0 1109 /* XXX it does not work */ 1110 if (rt->rt_flags & RTF_ANNOUNCE) 1111 nd6_na_output(ifp, 1112 &SIN6(rt_key(rt))->sin6_addr, 1113 &SIN6(rt_key(rt))->sin6_addr, 1114 ip6_forwarding ? ND_NA_FLAG_ROUTER : 0, 1115 1, NULL); 1116 #endif 1117 /* FALLTHROUGH */ 1118 case RTM_RESOLVE: 1119 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { 1120 /* 1121 * Address resolution isn't necessary for a point to 1122 * point link, so we can skip this test for a p2p link. 1123 */ 1124 if (gate->sa_family != AF_LINK || 1125 gate->sa_len < sizeof(null_sdl)) { 1126 log(LOG_DEBUG, 1127 "nd6_rtrequest: bad gateway value: %s\n", 1128 if_name(ifp)); 1129 break; 1130 } 1131 SDL(gate)->sdl_type = ifp->if_type; 1132 SDL(gate)->sdl_index = ifp->if_index; 1133 } 1134 if (ln != NULL) 1135 break; /* This happens on a route change */ 1136 /* 1137 * Case 2: This route may come from cloning, or a manual route 1138 * add with a LL address. 1139 */ 1140 R_Malloc(ln, struct llinfo_nd6 *, sizeof(*ln)); 1141 rt->rt_llinfo = (caddr_t)ln; 1142 if (!ln) { 1143 log(LOG_DEBUG, "nd6_rtrequest: malloc failed\n"); 1144 break; 1145 } 1146 nd6_inuse++; 1147 nd6_allocated++; 1148 Bzero(ln, sizeof(*ln)); 1149 ln->ln_rt = rt; 1150 /* this is required for "ndp" command. - shin */ 1151 if (req == RTM_ADD) { 1152 /* 1153 * gate should have some valid AF_LINK entry, 1154 * and ln->ln_expire should have some lifetime 1155 * which is specified by ndp command. 1156 */ 1157 ln->ln_state = ND6_LLINFO_REACHABLE; 1158 ln->ln_byhint = 0; 1159 } else { 1160 /* 1161 * When req == RTM_RESOLVE, rt is created and 1162 * initialized in rtrequest(), so rt_expire is 0. 1163 */ 1164 ln->ln_state = ND6_LLINFO_NOSTATE; 1165 ln->ln_expire = time_second; 1166 } 1167 rt->rt_flags |= RTF_LLINFO; 1168 ln->ln_next = llinfo_nd6.ln_next; 1169 llinfo_nd6.ln_next = ln; 1170 ln->ln_prev = &llinfo_nd6; 1171 ln->ln_next->ln_prev = ln; 1172 1173 /* 1174 * check if rt_key(rt) is one of my address assigned 1175 * to the interface. 1176 */ 1177 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(rt->rt_ifp, 1178 &SIN6(rt_key(rt))->sin6_addr); 1179 if (ifa) { 1180 caddr_t macp = nd6_ifptomac(ifp); 1181 ln->ln_expire = 0; 1182 ln->ln_state = ND6_LLINFO_REACHABLE; 1183 ln->ln_byhint = 0; 1184 if (macp) { 1185 Bcopy(macp, LLADDR(SDL(gate)), ifp->if_addrlen); 1186 SDL(gate)->sdl_alen = ifp->if_addrlen; 1187 } 1188 if (nd6_useloopback) { 1189 rt->rt_ifp = &loif[0]; /*XXX*/ 1190 /* 1191 * Make sure rt_ifa be equal to the ifaddr 1192 * corresponding to the address. 1193 * We need this because when we refer 1194 * rt_ifa->ia6_flags in ip6_input, we assume 1195 * that the rt_ifa points to the address instead 1196 * of the loopback address. 1197 */ 1198 if (ifa != rt->rt_ifa) { 1199 IFAFREE(rt->rt_ifa); 1200 IFAREF(ifa); 1201 rt->rt_ifa = ifa; 1202 } 1203 } 1204 } else if (rt->rt_flags & RTF_ANNOUNCE) { 1205 ln->ln_expire = 0; 1206 ln->ln_state = ND6_LLINFO_REACHABLE; 1207 ln->ln_byhint = 0; 1208 1209 /* join solicited node multicast for proxy ND */ 1210 if (ifp->if_flags & IFF_MULTICAST) { 1211 struct in6_addr llsol; 1212 int error; 1213 1214 llsol = SIN6(rt_key(rt))->sin6_addr; 1215 llsol.s6_addr16[0] = htons(0xff02); 1216 llsol.s6_addr16[1] = htons(ifp->if_index); 1217 llsol.s6_addr32[1] = 0; 1218 llsol.s6_addr32[2] = htonl(1); 1219 llsol.s6_addr8[12] = 0xff; 1220 1221 if (!in6_addmulti(&llsol, ifp, &error)) { 1222 nd6log((LOG_ERR, "%s: " 1223 "failed to join %s (errno=%d)\n", 1224 if_name(ifp), ip6_sprintf(&llsol), 1225 error)); 1226 } 1227 } 1228 } 1229 break; 1230 1231 case RTM_DELETE: 1232 if (!ln) 1233 break; 1234 /* leave from solicited node multicast for proxy ND */ 1235 if ((rt->rt_flags & RTF_ANNOUNCE) != 0 && 1236 (ifp->if_flags & IFF_MULTICAST) != 0) { 1237 struct in6_addr llsol; 1238 struct in6_multi *in6m; 1239 1240 llsol = SIN6(rt_key(rt))->sin6_addr; 1241 llsol.s6_addr16[0] = htons(0xff02); 1242 llsol.s6_addr16[1] = htons(ifp->if_index); 1243 llsol.s6_addr32[1] = 0; 1244 llsol.s6_addr32[2] = htonl(1); 1245 llsol.s6_addr8[12] = 0xff; 1246 1247 IN6_LOOKUP_MULTI(llsol, ifp, in6m); 1248 if (in6m) 1249 in6_delmulti(in6m); 1250 } 1251 nd6_inuse--; 1252 ln->ln_next->ln_prev = ln->ln_prev; 1253 ln->ln_prev->ln_next = ln->ln_next; 1254 ln->ln_prev = NULL; 1255 rt->rt_llinfo = 0; 1256 rt->rt_flags &= ~RTF_LLINFO; 1257 if (ln->ln_hold) 1258 m_freem(ln->ln_hold); 1259 Free((caddr_t)ln); 1260 } 1261 } 1262 1263 void 1264 nd6_p2p_rtrequest(req, rt, info) 1265 int req; 1266 struct rtentry *rt; 1267 struct rt_addrinfo *info; /* xxx unused */ 1268 { 1269 struct sockaddr *gate = rt->rt_gateway; 1270 static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK}; 1271 struct ifnet *ifp = rt->rt_ifp; 1272 struct ifaddr *ifa; 1273 1274 if (rt->rt_flags & RTF_GATEWAY) 1275 return; 1276 1277 switch (req) { 1278 case RTM_ADD: 1279 /* 1280 * There is no backward compatibility :) 1281 * 1282 * if ((rt->rt_flags & RTF_HOST) == 0 && 1283 * SIN(rt_mask(rt))->sin_addr.s_addr != 0xffffffff) 1284 * rt->rt_flags |= RTF_CLONING; 1285 */ 1286 if (rt->rt_flags & RTF_CLONING) { 1287 /* 1288 * Case 1: This route should come from 1289 * a route to interface. 1290 */ 1291 rt_setgate(rt, rt_key(rt), 1292 (struct sockaddr *)&null_sdl); 1293 gate = rt->rt_gateway; 1294 SDL(gate)->sdl_type = ifp->if_type; 1295 SDL(gate)->sdl_index = ifp->if_index; 1296 break; 1297 } 1298 /* Announce a new entry if requested. */ 1299 if (rt->rt_flags & RTF_ANNOUNCE) 1300 nd6_na_output(ifp, 1301 &SIN6(rt_key(rt))->sin6_addr, 1302 &SIN6(rt_key(rt))->sin6_addr, 1303 ip6_forwarding ? ND_NA_FLAG_ROUTER : 0, 1304 1, NULL); 1305 /* FALLTHROUGH */ 1306 case RTM_RESOLVE: 1307 /* 1308 * check if rt_key(rt) is one of my address assigned 1309 * to the interface. 1310 */ 1311 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(rt->rt_ifp, 1312 &SIN6(rt_key(rt))->sin6_addr); 1313 if (ifa) { 1314 if (nd6_useloopback) { 1315 rt->rt_ifp = &loif[0]; /*XXX*/ 1316 } 1317 } 1318 break; 1319 } 1320 } 1321 1322 int 1323 nd6_ioctl(cmd, data, ifp) 1324 u_long cmd; 1325 caddr_t data; 1326 struct ifnet *ifp; 1327 { 1328 struct in6_drlist *drl = (struct in6_drlist *)data; 1329 struct in6_prlist *prl = (struct in6_prlist *)data; 1330 struct in6_ndireq *ndi = (struct in6_ndireq *)data; 1331 struct in6_nbrinfo *nbi = (struct in6_nbrinfo *)data; 1332 struct in6_ndifreq *ndif = (struct in6_ndifreq *)data; 1333 struct nd_defrouter *dr, any; 1334 struct nd_prefix *pr; 1335 struct rtentry *rt; 1336 int i = 0, error = 0; 1337 int s; 1338 1339 switch (cmd) { 1340 case SIOCGDRLST_IN6: 1341 bzero(drl, sizeof(*drl)); 1342 s = splsoftnet(); 1343 dr = TAILQ_FIRST(&nd_defrouter); 1344 while (dr && i < DRLSTSIZ) { 1345 drl->defrouter[i].rtaddr = dr->rtaddr; 1346 if (IN6_IS_ADDR_LINKLOCAL(&drl->defrouter[i].rtaddr)) { 1347 /* XXX: need to this hack for KAME stack */ 1348 drl->defrouter[i].rtaddr.s6_addr16[1] = 0; 1349 } else 1350 log(LOG_ERR, 1351 "default router list contains a " 1352 "non-linklocal address(%s)\n", 1353 ip6_sprintf(&drl->defrouter[i].rtaddr)); 1354 1355 drl->defrouter[i].flags = dr->flags; 1356 drl->defrouter[i].rtlifetime = dr->rtlifetime; 1357 drl->defrouter[i].expire = dr->expire; 1358 drl->defrouter[i].if_index = dr->ifp->if_index; 1359 i++; 1360 dr = TAILQ_NEXT(dr, dr_entry); 1361 } 1362 splx(s); 1363 break; 1364 case SIOCGPRLST_IN6: 1365 /* 1366 * XXX meaning of fields, especialy "raflags", is very 1367 * differnet between RA prefix list and RR/static prefix list. 1368 * how about separating ioctls into two? 1369 */ 1370 bzero(prl, sizeof(*prl)); 1371 s = splsoftnet(); 1372 pr = nd_prefix.lh_first; 1373 while (pr && i < PRLSTSIZ) { 1374 struct nd_pfxrouter *pfr; 1375 int j; 1376 1377 prl->prefix[i].prefix = pr->ndpr_prefix.sin6_addr; 1378 prl->prefix[i].raflags = pr->ndpr_raf; 1379 prl->prefix[i].prefixlen = pr->ndpr_plen; 1380 prl->prefix[i].vltime = pr->ndpr_vltime; 1381 prl->prefix[i].pltime = pr->ndpr_pltime; 1382 prl->prefix[i].if_index = pr->ndpr_ifp->if_index; 1383 prl->prefix[i].expire = pr->ndpr_expire; 1384 1385 pfr = pr->ndpr_advrtrs.lh_first; 1386 j = 0; 1387 while (pfr) { 1388 if (j < DRLSTSIZ) { 1389 #define RTRADDR prl->prefix[i].advrtr[j] 1390 RTRADDR = pfr->router->rtaddr; 1391 if (IN6_IS_ADDR_LINKLOCAL(&RTRADDR)) { 1392 /* XXX: hack for KAME */ 1393 RTRADDR.s6_addr16[1] = 0; 1394 } else 1395 log(LOG_ERR, 1396 "a router(%s) advertises " 1397 "a prefix with " 1398 "non-link local address\n", 1399 ip6_sprintf(&RTRADDR)); 1400 #undef RTRADDR 1401 } 1402 j++; 1403 pfr = pfr->pfr_next; 1404 } 1405 prl->prefix[i].advrtrs = j; 1406 prl->prefix[i].origin = PR_ORIG_RA; 1407 1408 i++; 1409 pr = pr->ndpr_next; 1410 } 1411 { 1412 struct rr_prefix *rpp; 1413 1414 for (rpp = LIST_FIRST(&rr_prefix); rpp; 1415 rpp = LIST_NEXT(rpp, rp_entry)) { 1416 if (i >= PRLSTSIZ) 1417 break; 1418 prl->prefix[i].prefix = rpp->rp_prefix.sin6_addr; 1419 prl->prefix[i].raflags = rpp->rp_raf; 1420 prl->prefix[i].prefixlen = rpp->rp_plen; 1421 prl->prefix[i].vltime = rpp->rp_vltime; 1422 prl->prefix[i].pltime = rpp->rp_pltime; 1423 prl->prefix[i].if_index = rpp->rp_ifp->if_index; 1424 prl->prefix[i].expire = rpp->rp_expire; 1425 prl->prefix[i].advrtrs = 0; 1426 prl->prefix[i].origin = rpp->rp_origin; 1427 i++; 1428 } 1429 } 1430 splx(s); 1431 1432 break; 1433 case SIOCGIFINFO_IN6: 1434 if (!nd_ifinfo || i >= nd_ifinfo_indexlim) { 1435 error = EINVAL; 1436 break; 1437 } 1438 ndi->ndi = nd_ifinfo[ifp->if_index]; 1439 break; 1440 case SIOCSIFINFO_FLAGS: 1441 /* XXX: almost all other fields of ndi->ndi is unused */ 1442 if (!nd_ifinfo || i >= nd_ifinfo_indexlim) { 1443 error = EINVAL; 1444 break; 1445 } 1446 nd_ifinfo[ifp->if_index].flags = ndi->ndi.flags; 1447 break; 1448 case SIOCSNDFLUSH_IN6: /* XXX: the ioctl name is confusing... */ 1449 /* flush default router list */ 1450 /* 1451 * xxx sumikawa: should not delete route if default 1452 * route equals to the top of default router list 1453 */ 1454 bzero(&any, sizeof(any)); 1455 defrouter_delreq(&any, 0); 1456 defrouter_select(); 1457 /* xxx sumikawa: flush prefix list */ 1458 break; 1459 case SIOCSPFXFLUSH_IN6: 1460 { 1461 /* flush all the prefix advertised by routers */ 1462 struct nd_prefix *pr, *next; 1463 1464 s = splsoftnet(); 1465 for (pr = nd_prefix.lh_first; pr; pr = next) { 1466 next = pr->ndpr_next; 1467 if (!IN6_IS_ADDR_UNSPECIFIED(&pr->ndpr_addr)) 1468 in6_ifdel(pr->ndpr_ifp, &pr->ndpr_addr); 1469 prelist_remove(pr); 1470 } 1471 splx(s); 1472 break; 1473 } 1474 case SIOCSRTRFLUSH_IN6: 1475 { 1476 /* flush all the default routers */ 1477 struct nd_defrouter *dr, *next; 1478 1479 s = splsoftnet(); 1480 if ((dr = TAILQ_FIRST(&nd_defrouter)) != NULL) { 1481 /* 1482 * The first entry of the list may be stored in 1483 * the routing table, so we'll delete it later. 1484 */ 1485 for (dr = TAILQ_NEXT(dr, dr_entry); dr; dr = next) { 1486 next = TAILQ_NEXT(dr, dr_entry); 1487 defrtrlist_del(dr); 1488 } 1489 defrtrlist_del(TAILQ_FIRST(&nd_defrouter)); 1490 } 1491 splx(s); 1492 break; 1493 } 1494 case SIOCGNBRINFO_IN6: 1495 { 1496 struct llinfo_nd6 *ln; 1497 struct in6_addr nb_addr = nbi->addr; /* make local for safety */ 1498 1499 /* 1500 * XXX: KAME specific hack for scoped addresses 1501 * XXXX: for other scopes than link-local? 1502 */ 1503 if (IN6_IS_ADDR_LINKLOCAL(&nbi->addr) || 1504 IN6_IS_ADDR_MC_LINKLOCAL(&nbi->addr)) { 1505 u_int16_t *idp = (u_int16_t *)&nb_addr.s6_addr[2]; 1506 1507 if (*idp == 0) 1508 *idp = htons(ifp->if_index); 1509 } 1510 1511 s = splsoftnet(); 1512 if ((rt = nd6_lookup(&nb_addr, 0, ifp)) == NULL) { 1513 error = EINVAL; 1514 splx(s); 1515 break; 1516 } 1517 ln = (struct llinfo_nd6 *)rt->rt_llinfo; 1518 nbi->state = ln->ln_state; 1519 nbi->asked = ln->ln_asked; 1520 nbi->isrouter = ln->ln_router; 1521 nbi->expire = ln->ln_expire; 1522 splx(s); 1523 1524 break; 1525 } 1526 case SIOCGDEFIFACE_IN6: /* XXX: should be implemented as a sysctl? */ 1527 ndif->ifindex = nd6_defifindex; 1528 break; 1529 case SIOCSDEFIFACE_IN6: /* XXX: should be implemented as a sysctl? */ 1530 return(nd6_setdefaultiface(ndif->ifindex)); 1531 break; 1532 } 1533 return(error); 1534 } 1535 1536 /* 1537 * Create neighbor cache entry and cache link-layer address, 1538 * on reception of inbound ND6 packets. (RS/RA/NS/redirect) 1539 */ 1540 struct rtentry * 1541 nd6_cache_lladdr(ifp, from, lladdr, lladdrlen, type, code) 1542 struct ifnet *ifp; 1543 struct in6_addr *from; 1544 char *lladdr; 1545 int lladdrlen; 1546 int type; /* ICMP6 type */ 1547 int code; /* type dependent information */ 1548 { 1549 struct rtentry *rt = NULL; 1550 struct llinfo_nd6 *ln = NULL; 1551 int is_newentry; 1552 struct sockaddr_dl *sdl = NULL; 1553 int do_update; 1554 int olladdr; 1555 int llchange; 1556 int newstate = 0; 1557 long time_second = time.tv_sec; 1558 1559 if (!ifp) 1560 panic("ifp == NULL in nd6_cache_lladdr"); 1561 if (!from) 1562 panic("from == NULL in nd6_cache_lladdr"); 1563 1564 /* nothing must be updated for unspecified address */ 1565 if (IN6_IS_ADDR_UNSPECIFIED(from)) 1566 return NULL; 1567 1568 /* 1569 * Validation about ifp->if_addrlen and lladdrlen must be done in 1570 * the caller. 1571 * 1572 * XXX If the link does not have link-layer adderss, what should 1573 * we do? (ifp->if_addrlen == 0) 1574 * Spec says nothing in sections for RA, RS and NA. There's small 1575 * description on it in NS section (RFC 2461 7.2.3). 1576 */ 1577 1578 rt = nd6_lookup(from, 0, ifp); 1579 if (!rt) { 1580 #if 0 1581 /* nothing must be done if there's no lladdr */ 1582 if (!lladdr || !lladdrlen) 1583 return NULL; 1584 #endif 1585 1586 rt = nd6_lookup(from, 1, ifp); 1587 is_newentry = 1; 1588 } else { 1589 /* do nothing if static ndp is set */ 1590 if (rt->rt_flags & RTF_STATIC) 1591 return NULL; 1592 is_newentry = 0; 1593 } 1594 1595 if (!rt) 1596 return NULL; 1597 if ((rt->rt_flags & (RTF_GATEWAY | RTF_LLINFO)) != RTF_LLINFO) { 1598 fail: 1599 (void)nd6_free(rt); 1600 return NULL; 1601 } 1602 ln = (struct llinfo_nd6 *)rt->rt_llinfo; 1603 if (!ln) 1604 goto fail; 1605 if (!rt->rt_gateway) 1606 goto fail; 1607 if (rt->rt_gateway->sa_family != AF_LINK) 1608 goto fail; 1609 sdl = SDL(rt->rt_gateway); 1610 1611 olladdr = (sdl->sdl_alen) ? 1 : 0; 1612 if (olladdr && lladdr) { 1613 if (bcmp(lladdr, LLADDR(sdl), ifp->if_addrlen)) 1614 llchange = 1; 1615 else 1616 llchange = 0; 1617 } else 1618 llchange = 0; 1619 1620 /* 1621 * newentry olladdr lladdr llchange (*=record) 1622 * 0 n n -- (1) 1623 * 0 y n -- (2) 1624 * 0 n y -- (3) * STALE 1625 * 0 y y n (4) * 1626 * 0 y y y (5) * STALE 1627 * 1 -- n -- (6) NOSTATE(= PASSIVE) 1628 * 1 -- y -- (7) * STALE 1629 */ 1630 1631 if (lladdr) { /*(3-5) and (7)*/ 1632 /* 1633 * Record source link-layer address 1634 * XXX is it dependent to ifp->if_type? 1635 */ 1636 sdl->sdl_alen = ifp->if_addrlen; 1637 bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen); 1638 } 1639 1640 if (!is_newentry) { 1641 if ((!olladdr && lladdr) /*(3)*/ 1642 || (olladdr && lladdr && llchange)) { /*(5)*/ 1643 do_update = 1; 1644 newstate = ND6_LLINFO_STALE; 1645 } else /*(1-2,4)*/ 1646 do_update = 0; 1647 } else { 1648 do_update = 1; 1649 if (!lladdr) /*(6)*/ 1650 newstate = ND6_LLINFO_NOSTATE; 1651 else /*(7)*/ 1652 newstate = ND6_LLINFO_STALE; 1653 } 1654 1655 if (do_update) { 1656 /* 1657 * Update the state of the neighbor cache. 1658 */ 1659 ln->ln_state = newstate; 1660 1661 if (ln->ln_state == ND6_LLINFO_STALE) { 1662 /* 1663 * XXX: since nd6_output() below will cause 1664 * state tansition to DELAY and reset the timer, 1665 * we must set the timer now, although it is actually 1666 * meaningless. 1667 */ 1668 ln->ln_expire = time_second + nd6_gctimer; 1669 1670 if (ln->ln_hold) { 1671 #ifdef OLDIP6OUTPUT 1672 ln->ln_asked = 0; 1673 ln->ln_state = ND6_LLINFO_DELAY; 1674 ln->ln_expire = time_second + nd6_delay; 1675 (*ifp->if_output)(ifp, ln->ln_hold, 1676 rt_key(rt), rt); 1677 #else 1678 /* 1679 * we assume ifp is not a p2p here, so just 1680 * set the 2nd argument as the 1st one. 1681 */ 1682 nd6_output(ifp, ifp, ln->ln_hold, 1683 (struct sockaddr_in6 *)rt_key(rt), 1684 rt); 1685 #endif 1686 ln->ln_hold = NULL; 1687 } 1688 } else if (ln->ln_state == ND6_LLINFO_INCOMPLETE) { 1689 /* probe right away */ 1690 ln->ln_expire = time_second; 1691 } 1692 } 1693 1694 /* 1695 * ICMP6 type dependent behavior. 1696 * 1697 * NS: clear IsRouter if new entry 1698 * RS: clear IsRouter 1699 * RA: set IsRouter if there's lladdr 1700 * redir: clear IsRouter if new entry 1701 * 1702 * RA case, (1): 1703 * The spec says that we must set IsRouter in the following cases: 1704 * - If lladdr exist, set IsRouter. This means (1-5). 1705 * - If it is old entry (!newentry), set IsRouter. This means (7). 1706 * So, based on the spec, in (1-5) and (7) cases we must set IsRouter. 1707 * A quetion arises for (1) case. (1) case has no lladdr in the 1708 * neighbor cache, this is similar to (6). 1709 * This case is rare but we figured that we MUST NOT set IsRouter. 1710 * 1711 * newentry olladdr lladdr llchange NS RS RA redir 1712 * D R 1713 * 0 n n -- (1) c ? s 1714 * 0 y n -- (2) c s s 1715 * 0 n y -- (3) c s s 1716 * 0 y y n (4) c s s 1717 * 0 y y y (5) c s s 1718 * 1 -- n -- (6) c c c s 1719 * 1 -- y -- (7) c c s c s 1720 * 1721 * (c=clear s=set) 1722 */ 1723 switch (type & 0xff) { 1724 case ND_NEIGHBOR_SOLICIT: 1725 /* 1726 * New entry must have is_router flag cleared. 1727 */ 1728 if (is_newentry) /*(6-7)*/ 1729 ln->ln_router = 0; 1730 break; 1731 case ND_REDIRECT: 1732 /* 1733 * If the icmp is a redirect to a better router, always set the 1734 * is_router flag. Otherwise, if the entry is newly created, 1735 * clear the flag. [RFC 2461, sec 8.3] 1736 */ 1737 if (code == ND_REDIRECT_ROUTER) 1738 ln->ln_router = 1; 1739 else if (is_newentry) /*(6-7)*/ 1740 ln->ln_router = 0; 1741 break; 1742 case ND_ROUTER_SOLICIT: 1743 /* 1744 * is_router flag must always be cleared. 1745 */ 1746 ln->ln_router = 0; 1747 break; 1748 case ND_ROUTER_ADVERT: 1749 /* 1750 * Mark an entry with lladdr as a router. 1751 */ 1752 if ((!is_newentry && (olladdr || lladdr)) /*(2-5)*/ 1753 || (is_newentry && lladdr)) { /*(7)*/ 1754 ln->ln_router = 1; 1755 } 1756 break; 1757 } 1758 1759 /* 1760 * When the link-layer address of a router changes, select the 1761 * best router again. In particular, when the neighbor entry is newly 1762 * created, it might affect the selection policy. 1763 * Question: can we restrict the first condition to the "is_newentry" 1764 * case? 1765 * XXX: when we hear an RA from a new router with the link-layer 1766 * address option, defrouter_select() is called twice, since 1767 * defrtrlist_update called the function as well. However, I believe 1768 * we can compromise the overhead, since it only happens the first 1769 * time. 1770 */ 1771 if (do_update && ln->ln_router) 1772 defrouter_select(); 1773 1774 return rt; 1775 } 1776 1777 static void 1778 nd6_slowtimo(ignored_arg) 1779 void *ignored_arg; 1780 { 1781 int s = splsoftnet(); 1782 int i; 1783 struct nd_ifinfo *nd6if; 1784 1785 callout_reset(&nd6_slowtimo_ch, ND6_SLOWTIMER_INTERVAL * hz, 1786 nd6_slowtimo, NULL); 1787 for (i = 1; i < if_index + 1; i++) { 1788 if (!nd_ifinfo || i >= nd_ifinfo_indexlim) 1789 continue; 1790 nd6if = &nd_ifinfo[i]; 1791 if (nd6if->basereachable && /* already initialized */ 1792 (nd6if->recalctm -= ND6_SLOWTIMER_INTERVAL) <= 0) { 1793 /* 1794 * Since reachable time rarely changes by router 1795 * advertisements, we SHOULD insure that a new random 1796 * value gets recomputed at least once every few hours. 1797 * (RFC 2461, 6.3.4) 1798 */ 1799 nd6if->recalctm = nd6_recalc_reachtm_interval; 1800 nd6if->reachable = ND_COMPUTE_RTIME(nd6if->basereachable); 1801 } 1802 } 1803 splx(s); 1804 } 1805 1806 #define senderr(e) { error = (e); goto bad;} 1807 int 1808 nd6_output(ifp, origifp, m0, dst, rt0) 1809 struct ifnet *ifp; 1810 struct ifnet *origifp; 1811 struct mbuf *m0; 1812 struct sockaddr_in6 *dst; 1813 struct rtentry *rt0; 1814 { 1815 struct mbuf *m = m0; 1816 struct rtentry *rt = rt0; 1817 struct sockaddr_in6 *gw6 = NULL; 1818 struct llinfo_nd6 *ln = NULL; 1819 int error = 0; 1820 long time_second = time.tv_sec; 1821 1822 if (IN6_IS_ADDR_MULTICAST(&dst->sin6_addr)) 1823 goto sendpkt; 1824 1825 /* 1826 * XXX: we currently do not make neighbor cache on any interface 1827 * other than ARCnet, Ethernet, FDDI and GIF. 1828 * 1829 * RFC2893 says: 1830 * - unidirectional tunnels needs no ND 1831 */ 1832 switch (ifp->if_type) { 1833 case IFT_ARCNET: 1834 case IFT_ETHER: 1835 case IFT_FDDI: 1836 case IFT_IEEE1394: 1837 case IFT_GIF: /* XXX need more cases? */ 1838 break; 1839 default: 1840 goto sendpkt; 1841 } 1842 1843 /* 1844 * next hop determination. This routine is derived from ether_outpout. 1845 */ 1846 if (rt) { 1847 if ((rt->rt_flags & RTF_UP) == 0) { 1848 if ((rt0 = rt = rtalloc1((struct sockaddr *)dst, 1)) != 1849 NULL) 1850 { 1851 rt->rt_refcnt--; 1852 if (rt->rt_ifp != ifp) { 1853 /* XXX: loop care? */ 1854 return nd6_output(ifp, origifp, m0, 1855 dst, rt); 1856 } 1857 } else 1858 senderr(EHOSTUNREACH); 1859 } 1860 1861 if (rt->rt_flags & RTF_GATEWAY) { 1862 gw6 = (struct sockaddr_in6 *)rt->rt_gateway; 1863 1864 /* 1865 * We skip link-layer address resolution and NUD 1866 * if the gateway is not a neighbor from ND point 1867 * of view, regardless the value of the 1868 * nd_ifinfo.flags. 1869 * The second condition is a bit tricky: we skip 1870 * if the gateway is our own address, which is 1871 * sometimes used to install a route to a p2p link. 1872 */ 1873 if (!nd6_is_addr_neighbor(gw6, ifp) || 1874 in6ifa_ifpwithaddr(ifp, &gw6->sin6_addr)) { 1875 /* 1876 * We allow this kind of tricky route only 1877 * when the outgoing interface is p2p. 1878 * XXX: we may need a more generic rule here. 1879 */ 1880 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 1881 senderr(EHOSTUNREACH); 1882 1883 goto sendpkt; 1884 } 1885 1886 if (rt->rt_gwroute == 0) 1887 goto lookup; 1888 if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) { 1889 rtfree(rt); rt = rt0; 1890 lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1); 1891 if ((rt = rt->rt_gwroute) == 0) 1892 senderr(EHOSTUNREACH); 1893 } 1894 } 1895 } 1896 1897 /* 1898 * Address resolution or Neighbor Unreachability Detection 1899 * for the next hop. 1900 * At this point, the destination of the packet must be a unicast 1901 * or an anycast address(i.e. not a multicast). 1902 */ 1903 1904 /* Look up the neighbor cache for the nexthop */ 1905 if (rt && (rt->rt_flags & RTF_LLINFO) != 0) 1906 ln = (struct llinfo_nd6 *)rt->rt_llinfo; 1907 else { 1908 /* 1909 * Since nd6_is_addr_neighbor() internally calls nd6_lookup(), 1910 * the condition below is not very efficient. But we believe 1911 * it is tolerable, because this should be a rare case. 1912 */ 1913 if (nd6_is_addr_neighbor(dst, ifp) && 1914 (rt = nd6_lookup(&dst->sin6_addr, 1, ifp)) != NULL) 1915 ln = (struct llinfo_nd6 *)rt->rt_llinfo; 1916 } 1917 if (!ln || !rt) { 1918 if ((ifp->if_flags & IFF_POINTOPOINT) == 0 && 1919 !(nd_ifinfo[ifp->if_index].flags & ND6_IFF_PERFORMNUD)) { 1920 log(LOG_DEBUG, 1921 "nd6_output: can't allocate llinfo for %s " 1922 "(ln=%p, rt=%p)\n", 1923 ip6_sprintf(&dst->sin6_addr), ln, rt); 1924 senderr(EIO); /* XXX: good error? */ 1925 } 1926 1927 goto sendpkt; /* send anyway */ 1928 } 1929 1930 /* We don't have to do link-layer address resolution on a p2p link. */ 1931 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 && 1932 ln->ln_state < ND6_LLINFO_REACHABLE) { 1933 ln->ln_state = ND6_LLINFO_STALE; 1934 ln->ln_expire = time_second + nd6_gctimer; 1935 } 1936 1937 /* 1938 * The first time we send a packet to a neighbor whose entry is 1939 * STALE, we have to change the state to DELAY and a sets a timer to 1940 * expire in DELAY_FIRST_PROBE_TIME seconds to ensure do 1941 * neighbor unreachability detection on expiration. 1942 * (RFC 2461 7.3.3) 1943 */ 1944 if (ln->ln_state == ND6_LLINFO_STALE) { 1945 ln->ln_asked = 0; 1946 ln->ln_state = ND6_LLINFO_DELAY; 1947 ln->ln_expire = time_second + nd6_delay; 1948 } 1949 1950 /* 1951 * If the neighbor cache entry has a state other than INCOMPLETE 1952 * (i.e. its link-layer address is already reloved), just 1953 * send the packet. 1954 */ 1955 if (ln->ln_state > ND6_LLINFO_INCOMPLETE) 1956 goto sendpkt; 1957 1958 /* 1959 * There is a neighbor cache entry, but no ethernet address 1960 * response yet. Replace the held mbuf (if any) with this 1961 * latest one. 1962 * 1963 * XXX Does the code conform to rate-limiting rule? 1964 * (RFC 2461 7.2.2) 1965 */ 1966 if (ln->ln_state == ND6_LLINFO_NOSTATE) 1967 ln->ln_state = ND6_LLINFO_INCOMPLETE; 1968 if (ln->ln_hold) 1969 m_freem(ln->ln_hold); 1970 ln->ln_hold = m; 1971 if (ln->ln_expire) { 1972 if (ln->ln_asked < nd6_mmaxtries && 1973 ln->ln_expire < time_second) { 1974 ln->ln_asked++; 1975 ln->ln_expire = time_second + 1976 nd_ifinfo[ifp->if_index].retrans / 1000; 1977 nd6_ns_output(ifp, NULL, &dst->sin6_addr, ln, 0); 1978 } 1979 } 1980 return(0); 1981 1982 sendpkt: 1983 1984 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 1985 return((*ifp->if_output)(origifp, m, (struct sockaddr *)dst, 1986 rt)); 1987 } 1988 return((*ifp->if_output)(ifp, m, (struct sockaddr *)dst, rt)); 1989 1990 bad: 1991 if (m) 1992 m_freem(m); 1993 return (error); 1994 } 1995 #undef senderr 1996 1997 int 1998 nd6_storelladdr(ifp, rt, m, dst, desten) 1999 struct ifnet *ifp; 2000 struct rtentry *rt; 2001 struct mbuf *m; 2002 struct sockaddr *dst; 2003 u_char *desten; 2004 { 2005 struct sockaddr_dl *sdl; 2006 2007 if (m->m_flags & M_MCAST) { 2008 switch (ifp->if_type) { 2009 case IFT_ETHER: 2010 case IFT_FDDI: 2011 ETHER_MAP_IPV6_MULTICAST(&SIN6(dst)->sin6_addr, 2012 desten); 2013 return(1); 2014 case IFT_IEEE1394: 2015 bcopy(ifp->if_broadcastaddr, desten, ifp->if_addrlen); 2016 return(1); 2017 case IFT_ARCNET: 2018 *desten = 0; 2019 return(1); 2020 default: 2021 m_freem(m); 2022 return(0); 2023 } 2024 } 2025 2026 if (rt == NULL) { 2027 /* this could happen, if we could not allocate memory */ 2028 m_freem(m); 2029 return(0); 2030 } 2031 if (rt->rt_gateway->sa_family != AF_LINK) { 2032 printf("nd6_storelladdr: something odd happens\n"); 2033 m_freem(m); 2034 return(0); 2035 } 2036 sdl = SDL(rt->rt_gateway); 2037 if (sdl->sdl_alen == 0) { 2038 /* this should be impossible, but we bark here for debugging */ 2039 printf("nd6_storelladdr: sdl_alen == 0\n"); 2040 m_freem(m); 2041 return(0); 2042 } 2043 2044 bcopy(LLADDR(sdl), desten, sdl->sdl_alen); 2045 return(1); 2046 } 2047
Indexes created Mon Sep 22 13:09:51 GMT 2025