nd6.c revision 1.46
1 /* $NetBSD: nd6.c,v 1.46 2001/05/24 08:17:22 itojun Exp $ */ 2 /* $KAME: nd6.c,v 1.137 2001/03/21 21:52:06 jinmei Exp $ */ 3 4 /* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* 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 /* refresh default router list */ 629 bzero(&drany, sizeof(drany)); 630 defrouter_delreq(&drany, 0); 631 defrouter_select(); 632 633 /* 634 * Nuke neighbor cache entries for the ifp. 635 * Note that rt->rt_ifp may not be the same as ifp, 636 * due to KAME goto ours hack. See RTM_RESOLVE case in 637 * nd6_rtrequest(), and ip6_input(). 638 */ 639 ln = llinfo_nd6.ln_next; 640 while (ln && ln != &llinfo_nd6) { 641 struct rtentry *rt; 642 struct sockaddr_dl *sdl; 643 644 nln = ln->ln_next; 645 rt = ln->ln_rt; 646 if (rt && rt->rt_gateway && 647 rt->rt_gateway->sa_family == AF_LINK) { 648 sdl = (struct sockaddr_dl *)rt->rt_gateway; 649 if (sdl->sdl_index == ifp->if_index) 650 nln = nd6_free(rt); 651 } 652 ln = nln; 653 } 654 } 655 656 struct rtentry * 657 nd6_lookup(addr6, create, ifp) 658 struct in6_addr *addr6; 659 int create; 660 struct ifnet *ifp; 661 { 662 struct rtentry *rt; 663 struct sockaddr_in6 sin6; 664 665 bzero(&sin6, sizeof(sin6)); 666 sin6.sin6_len = sizeof(struct sockaddr_in6); 667 sin6.sin6_family = AF_INET6; 668 sin6.sin6_addr = *addr6; 669 rt = rtalloc1((struct sockaddr *)&sin6, create); 670 if (rt && (rt->rt_flags & RTF_LLINFO) == 0) { 671 /* 672 * This is the case for the default route. 673 * If we want to create a neighbor cache for the address, we 674 * should free the route for the destination and allocate an 675 * interface route. 676 */ 677 if (create) { 678 RTFREE(rt); 679 rt = 0; 680 } 681 } 682 if (!rt) { 683 if (create && ifp) { 684 int e; 685 686 /* 687 * If no route is available and create is set, 688 * we allocate a host route for the destination 689 * and treat it like an interface route. 690 * This hack is necessary for a neighbor which can't 691 * be covered by our own prefix. 692 */ 693 struct ifaddr *ifa = 694 ifaof_ifpforaddr((struct sockaddr *)&sin6, ifp); 695 if (ifa == NULL) 696 return(NULL); 697 698 /* 699 * Create a new route. RTF_LLINFO is necessary 700 * to create a Neighbor Cache entry for the 701 * destination in nd6_rtrequest which will be 702 * called in rtequest via ifa->ifa_rtrequest. 703 */ 704 if ((e = rtrequest(RTM_ADD, (struct sockaddr *)&sin6, 705 ifa->ifa_addr, 706 (struct sockaddr *)&all1_sa, 707 (ifa->ifa_flags | 708 RTF_HOST | RTF_LLINFO) & 709 ~RTF_CLONING, 710 &rt)) != 0) 711 log(LOG_ERR, 712 "nd6_lookup: failed to add route for a " 713 "neighbor(%s), errno=%d\n", 714 ip6_sprintf(addr6), e); 715 if (rt == NULL) 716 return(NULL); 717 if (rt->rt_llinfo) { 718 struct llinfo_nd6 *ln = 719 (struct llinfo_nd6 *)rt->rt_llinfo; 720 ln->ln_state = ND6_LLINFO_NOSTATE; 721 } 722 } else 723 return(NULL); 724 } 725 rt->rt_refcnt--; 726 /* 727 * Validation for the entry. 728 * XXX: we can't use rt->rt_ifp to check for the interface, since 729 * it might be the loopback interface if the entry is for our 730 * own address on a non-loopback interface. Instead, we should 731 * use rt->rt_ifa->ifa_ifp, which would specify the REAL interface. 732 */ 733 if ((rt->rt_flags & RTF_GATEWAY) || (rt->rt_flags & RTF_LLINFO) == 0 || 734 rt->rt_gateway->sa_family != AF_LINK || 735 (ifp && rt->rt_ifa->ifa_ifp != ifp)) { 736 if (create) { 737 log(LOG_DEBUG, "nd6_lookup: failed to lookup %s (if = %s)\n", 738 ip6_sprintf(addr6), ifp ? if_name(ifp) : "unspec"); 739 /* xxx more logs... kazu */ 740 } 741 return(0); 742 } 743 return(rt); 744 } 745 746 /* 747 * Detect if a given IPv6 address identifies a neighbor on a given link. 748 * XXX: should take care of the destination of a p2p link? 749 */ 750 int 751 nd6_is_addr_neighbor(addr, ifp) 752 struct sockaddr_in6 *addr; 753 struct ifnet *ifp; 754 { 755 struct ifaddr *ifa; 756 int i; 757 758 #define IFADDR6(a) ((((struct in6_ifaddr *)(a))->ia_addr).sin6_addr) 759 #define IFMASK6(a) ((((struct in6_ifaddr *)(a))->ia_prefixmask).sin6_addr) 760 761 /* 762 * A link-local address is always a neighbor. 763 * XXX: we should use the sin6_scope_id field rather than the embedded 764 * interface index. 765 */ 766 if (IN6_IS_ADDR_LINKLOCAL(&addr->sin6_addr) && 767 ntohs(*(u_int16_t *)&addr->sin6_addr.s6_addr[2]) == ifp->if_index) 768 return(1); 769 770 /* 771 * If the address matches one of our addresses, 772 * it should be a neighbor. 773 */ 774 for (ifa = ifp->if_addrlist.tqh_first; 775 ifa; 776 ifa = ifa->ifa_list.tqe_next) 777 { 778 if (ifa->ifa_addr->sa_family != AF_INET6) 779 next: continue; 780 781 for (i = 0; i < 4; i++) { 782 if ((IFADDR6(ifa).s6_addr32[i] ^ 783 addr->sin6_addr.s6_addr32[i]) & 784 IFMASK6(ifa).s6_addr32[i]) 785 goto next; 786 } 787 return(1); 788 } 789 790 /* 791 * Even if the address matches none of our addresses, it might be 792 * in the neighbor cache. 793 */ 794 if (nd6_lookup(&addr->sin6_addr, 0, ifp)) 795 return(1); 796 797 return(0); 798 #undef IFADDR6 799 #undef IFMASK6 800 } 801 802 /* 803 * Free an nd6 llinfo entry. 804 */ 805 struct llinfo_nd6 * 806 nd6_free(rt) 807 struct rtentry *rt; 808 { 809 struct llinfo_nd6 *ln = (struct llinfo_nd6 *)rt->rt_llinfo, *next; 810 struct in6_addr in6 = ((struct sockaddr_in6 *)rt_key(rt))->sin6_addr; 811 struct nd_defrouter *dr; 812 813 /* 814 * Clear all destination cache entries for the neighbor. 815 * XXX: is it better to restrict this to hosts? 816 */ 817 pfctlinput(PRC_HOSTDEAD, rt_key(rt)); 818 819 if (!ip6_forwarding && ip6_accept_rtadv) { /* XXX: too restrictive? */ 820 int s; 821 s = splsoftnet(); 822 dr = defrouter_lookup(&((struct sockaddr_in6 *)rt_key(rt))->sin6_addr, 823 rt->rt_ifp); 824 if (ln->ln_router || dr) { 825 /* 826 * rt6_flush must be called whether or not the neighbor 827 * is in the Default Router List. 828 * See a corresponding comment in nd6_na_input(). 829 */ 830 rt6_flush(&in6, rt->rt_ifp); 831 } 832 833 if (dr) { 834 /* 835 * Unreachablity of a router might affect the default 836 * router selection and on-link detection of advertised 837 * prefixes. 838 */ 839 840 /* 841 * Temporarily fake the state to choose a new default 842 * router and to perform on-link determination of 843 * prefixes coreectly. 844 * Below the state will be set correctly, 845 * or the entry itself will be deleted. 846 */ 847 ln->ln_state = ND6_LLINFO_INCOMPLETE; 848 849 if (dr == TAILQ_FIRST(&nd_defrouter)) { 850 /* 851 * It is used as the current default router, 852 * so we have to move it to the end of the 853 * list and choose a new one. 854 * XXX: it is not very efficient if this is 855 * the only router. 856 */ 857 TAILQ_REMOVE(&nd_defrouter, dr, dr_entry); 858 TAILQ_INSERT_TAIL(&nd_defrouter, dr, dr_entry); 859 860 defrouter_select(); 861 } 862 pfxlist_onlink_check(); 863 } 864 splx(s); 865 } 866 867 /* 868 * Before deleting the entry, remember the next entry as the 869 * return value. We need this because pfxlist_onlink_check() above 870 * might have freed other entries (particularly the old next entry) as 871 * a side effect (XXX). 872 */ 873 next = ln->ln_next; 874 875 /* 876 * Detach the route from the routing tree and the list of neighbor 877 * caches, and disable the route entry not to be used in already 878 * cached routes. 879 */ 880 rtrequest(RTM_DELETE, rt_key(rt), (struct sockaddr *)0, 881 rt_mask(rt), 0, (struct rtentry **)0); 882 883 return(next); 884 } 885 886 /* 887 * Upper-layer reachability hint for Neighbor Unreachability Detection. 888 * 889 * XXX cost-effective metods? 890 */ 891 void 892 nd6_nud_hint(rt, dst6, force) 893 struct rtentry *rt; 894 struct in6_addr *dst6; 895 int force; 896 { 897 struct llinfo_nd6 *ln; 898 long time_second = time.tv_sec; 899 900 /* 901 * If the caller specified "rt", use that. Otherwise, resolve the 902 * routing table by supplied "dst6". 903 */ 904 if (!rt) { 905 if (!dst6) 906 return; 907 if (!(rt = nd6_lookup(dst6, 0, NULL))) 908 return; 909 } 910 911 if ((rt->rt_flags & RTF_GATEWAY) != 0 || 912 (rt->rt_flags & RTF_LLINFO) == 0 || 913 !rt->rt_llinfo || !rt->rt_gateway || 914 rt->rt_gateway->sa_family != AF_LINK) { 915 /* This is not a host route. */ 916 return; 917 } 918 919 ln = (struct llinfo_nd6 *)rt->rt_llinfo; 920 if (ln->ln_state < ND6_LLINFO_REACHABLE) 921 return; 922 923 /* 924 * if we get upper-layer reachability confirmation many times, 925 * it is possible we have false information. 926 */ 927 if (!force) { 928 ln->ln_byhint++; 929 if (ln->ln_byhint > nd6_maxnudhint) 930 return; 931 } 932 933 ln->ln_state = ND6_LLINFO_REACHABLE; 934 if (ln->ln_expire) 935 ln->ln_expire = time_second + 936 nd_ifinfo[rt->rt_ifp->if_index].reachable; 937 } 938 939 #ifdef OLDIP6OUTPUT 940 /* 941 * Resolve an IP6 address into an ethernet address. If success, 942 * desten is filled in. If there is no entry in ndptab, 943 * set one up and multicast a solicitation for the IP6 address. 944 * Hold onto this mbuf and resend it once the address 945 * is finally resolved. A return value of 1 indicates 946 * that desten has been filled in and the packet should be sent 947 * normally; a 0 return indicates that the packet has been 948 * taken over here, either now or for later transmission. 949 */ 950 int 951 nd6_resolve(ifp, rt, m, dst, desten) 952 struct ifnet *ifp; 953 struct rtentry *rt; 954 struct mbuf *m; 955 struct sockaddr *dst; 956 u_char *desten; 957 { 958 struct llinfo_nd6 *ln = (struct llinfo_nd6 *)NULL; 959 struct sockaddr_dl *sdl; 960 long time_second = time.tv_sec; 961 962 if (m->m_flags & M_MCAST) { 963 switch (ifp->if_type) { 964 case IFT_ETHER: 965 case IFT_FDDI: 966 ETHER_MAP_IPV6_MULTICAST(&SIN6(dst)->sin6_addr, 967 desten); 968 return(1); 969 case IFT_IEEE1394: 970 bcopy(ifp->if_broadcastaddr, desten, ifp->if_addrlen); 971 return(1); 972 case IFT_ARCNET: 973 *desten = 0; 974 return(1); 975 default: 976 m_freem(m); 977 return(0); 978 } 979 } 980 if (rt && (rt->rt_flags & RTF_LLINFO) != 0) 981 ln = (struct llinfo_nd6 *)rt->rt_llinfo; 982 else { 983 if ((rt = nd6_lookup(&(SIN6(dst)->sin6_addr), 1, ifp)) != NULL) 984 ln = (struct llinfo_nd6 *)rt->rt_llinfo; 985 } 986 if (!ln || !rt) { 987 log(LOG_DEBUG, "nd6_resolve: can't allocate llinfo for %s\n", 988 ip6_sprintf(&(SIN6(dst)->sin6_addr))); 989 m_freem(m); 990 return(0); 991 } 992 sdl = SDL(rt->rt_gateway); 993 /* 994 * Ckeck the address family and length is valid, the address 995 * is resolved; otherwise, try to resolve. 996 */ 997 if (ln->ln_state >= ND6_LLINFO_REACHABLE 998 && sdl->sdl_family == AF_LINK 999 && sdl->sdl_alen != 0) { 1000 bcopy(LLADDR(sdl), desten, sdl->sdl_alen); 1001 if (ln->ln_state == ND6_LLINFO_STALE) { 1002 ln->ln_asked = 0; 1003 ln->ln_state = ND6_LLINFO_DELAY; 1004 ln->ln_expire = time_second + nd6_delay; 1005 } 1006 return(1); 1007 } 1008 /* 1009 * There is an ndp entry, but no ethernet address 1010 * response yet. Replace the held mbuf with this 1011 * latest one. 1012 * 1013 * XXX Does the code conform to rate-limiting rule? 1014 * (RFC 2461 7.2.2) 1015 */ 1016 if (ln->ln_state == ND6_LLINFO_NOSTATE) 1017 ln->ln_state = ND6_LLINFO_INCOMPLETE; 1018 if (ln->ln_hold) 1019 m_freem(ln->ln_hold); 1020 ln->ln_hold = m; 1021 if (ln->ln_expire) { 1022 if (ln->ln_asked < nd6_mmaxtries && 1023 ln->ln_expire < time_second) { 1024 ln->ln_asked++; 1025 ln->ln_expire = time_second + 1026 nd_ifinfo[ifp->if_index].retrans / 1000; 1027 nd6_ns_output(ifp, NULL, &(SIN6(dst)->sin6_addr), 1028 ln, 0); 1029 } 1030 } 1031 /* do not free mbuf here, it is queued into llinfo_nd6 */ 1032 return(0); 1033 } 1034 #endif /* OLDIP6OUTPUT */ 1035 1036 void 1037 nd6_rtrequest(req, rt, info) 1038 int req; 1039 struct rtentry *rt; 1040 struct rt_addrinfo *info; /* xxx unused */ 1041 { 1042 struct sockaddr *gate = rt->rt_gateway; 1043 struct llinfo_nd6 *ln = (struct llinfo_nd6 *)rt->rt_llinfo; 1044 static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK}; 1045 struct ifnet *ifp = rt->rt_ifp; 1046 struct ifaddr *ifa; 1047 long time_second = time.tv_sec; 1048 1049 if (rt->rt_flags & RTF_GATEWAY) 1050 return; 1051 1052 switch (req) { 1053 case RTM_ADD: 1054 /* 1055 * There is no backward compatibility :) 1056 * 1057 * if ((rt->rt_flags & RTF_HOST) == 0 && 1058 * SIN(rt_mask(rt))->sin_addr.s_addr != 0xffffffff) 1059 * rt->rt_flags |= RTF_CLONING; 1060 */ 1061 if (rt->rt_flags & (RTF_CLONING | RTF_LLINFO)) { 1062 /* 1063 * Case 1: This route should come from 1064 * a route to interface. RTF_LLINFO flag is set 1065 * for a host route whose destination should be 1066 * treated as on-link. 1067 */ 1068 rt_setgate(rt, rt_key(rt), 1069 (struct sockaddr *)&null_sdl); 1070 gate = rt->rt_gateway; 1071 SDL(gate)->sdl_type = ifp->if_type; 1072 SDL(gate)->sdl_index = ifp->if_index; 1073 if (ln) 1074 ln->ln_expire = time_second; 1075 #if 1 1076 if (ln && ln->ln_expire == 0) { 1077 /* kludge for desktops */ 1078 #if 0 1079 printf("nd6_request: time.tv_sec is zero; " 1080 "treat it as 1\n"); 1081 #endif 1082 ln->ln_expire = 1; 1083 } 1084 #endif 1085 if (rt->rt_flags & RTF_CLONING) 1086 break; 1087 } 1088 /* 1089 * In IPv4 code, we try to annonuce new RTF_ANNOUNCE entry here. 1090 * We don't do that here since llinfo is not ready yet. 1091 * 1092 * There are also couple of other things to be discussed: 1093 * - unsolicited NA code needs improvement beforehand 1094 * - RFC2461 says we MAY send multicast unsolicited NA 1095 * (7.2.6 paragraph 4), however, it also says that we 1096 * SHOULD provide a mechanism to prevent multicast NA storm. 1097 * we don't have anything like it right now. 1098 * note that the mechanism needs a mutual agreement 1099 * between proxies, which means that we need to implement 1100 * a new protocol, or a new kludge. 1101 * - from RFC2461 6.2.4, host MUST NOT send an unsolicited NA. 1102 * we need to check ip6forwarding before sending it. 1103 * (or should we allow proxy ND configuration only for 1104 * routers? there's no mention about proxy ND from hosts) 1105 */ 1106 #if 0 1107 /* XXX it does not work */ 1108 if (rt->rt_flags & RTF_ANNOUNCE) 1109 nd6_na_output(ifp, 1110 &SIN6(rt_key(rt))->sin6_addr, 1111 &SIN6(rt_key(rt))->sin6_addr, 1112 ip6_forwarding ? ND_NA_FLAG_ROUTER : 0, 1113 1, NULL); 1114 #endif 1115 /* FALLTHROUGH */ 1116 case RTM_RESOLVE: 1117 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { 1118 /* 1119 * Address resolution isn't necessary for a point to 1120 * point link, so we can skip this test for a p2p link. 1121 */ 1122 if (gate->sa_family != AF_LINK || 1123 gate->sa_len < sizeof(null_sdl)) { 1124 log(LOG_DEBUG, 1125 "nd6_rtrequest: bad gateway value: %s\n", 1126 if_name(ifp)); 1127 break; 1128 } 1129 SDL(gate)->sdl_type = ifp->if_type; 1130 SDL(gate)->sdl_index = ifp->if_index; 1131 } 1132 if (ln != NULL) 1133 break; /* This happens on a route change */ 1134 /* 1135 * Case 2: This route may come from cloning, or a manual route 1136 * add with a LL address. 1137 */ 1138 R_Malloc(ln, struct llinfo_nd6 *, sizeof(*ln)); 1139 rt->rt_llinfo = (caddr_t)ln; 1140 if (!ln) { 1141 log(LOG_DEBUG, "nd6_rtrequest: malloc failed\n"); 1142 break; 1143 } 1144 nd6_inuse++; 1145 nd6_allocated++; 1146 Bzero(ln, sizeof(*ln)); 1147 ln->ln_rt = rt; 1148 /* this is required for "ndp" command. - shin */ 1149 if (req == RTM_ADD) { 1150 /* 1151 * gate should have some valid AF_LINK entry, 1152 * and ln->ln_expire should have some lifetime 1153 * which is specified by ndp command. 1154 */ 1155 ln->ln_state = ND6_LLINFO_REACHABLE; 1156 ln->ln_byhint = 0; 1157 } else { 1158 /* 1159 * When req == RTM_RESOLVE, rt is created and 1160 * initialized in rtrequest(), so rt_expire is 0. 1161 */ 1162 ln->ln_state = ND6_LLINFO_NOSTATE; 1163 ln->ln_expire = time_second; 1164 } 1165 rt->rt_flags |= RTF_LLINFO; 1166 ln->ln_next = llinfo_nd6.ln_next; 1167 llinfo_nd6.ln_next = ln; 1168 ln->ln_prev = &llinfo_nd6; 1169 ln->ln_next->ln_prev = ln; 1170 1171 /* 1172 * check if rt_key(rt) is one of my address assigned 1173 * to the interface. 1174 */ 1175 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(rt->rt_ifp, 1176 &SIN6(rt_key(rt))->sin6_addr); 1177 if (ifa) { 1178 caddr_t macp = nd6_ifptomac(ifp); 1179 ln->ln_expire = 0; 1180 ln->ln_state = ND6_LLINFO_REACHABLE; 1181 ln->ln_byhint = 0; 1182 if (macp) { 1183 Bcopy(macp, LLADDR(SDL(gate)), ifp->if_addrlen); 1184 SDL(gate)->sdl_alen = ifp->if_addrlen; 1185 } 1186 if (nd6_useloopback) { 1187 rt->rt_ifp = &loif[0]; /*XXX*/ 1188 /* 1189 * Make sure rt_ifa be equal to the ifaddr 1190 * corresponding to the address. 1191 * We need this because when we refer 1192 * rt_ifa->ia6_flags in ip6_input, we assume 1193 * that the rt_ifa points to the address instead 1194 * of the loopback address. 1195 */ 1196 if (ifa != rt->rt_ifa) { 1197 IFAFREE(rt->rt_ifa); 1198 IFAREF(ifa); 1199 rt->rt_ifa = ifa; 1200 } 1201 } 1202 } else if (rt->rt_flags & RTF_ANNOUNCE) { 1203 ln->ln_expire = 0; 1204 ln->ln_state = ND6_LLINFO_REACHABLE; 1205 ln->ln_byhint = 0; 1206 1207 /* join solicited node multicast for proxy ND */ 1208 if (ifp->if_flags & IFF_MULTICAST) { 1209 struct in6_addr llsol; 1210 int error; 1211 1212 llsol = SIN6(rt_key(rt))->sin6_addr; 1213 llsol.s6_addr16[0] = htons(0xff02); 1214 llsol.s6_addr16[1] = htons(ifp->if_index); 1215 llsol.s6_addr32[1] = 0; 1216 llsol.s6_addr32[2] = htonl(1); 1217 llsol.s6_addr8[12] = 0xff; 1218 1219 if (!in6_addmulti(&llsol, ifp, &error)) { 1220 nd6log((LOG_ERR, "%s: " 1221 "failed to join %s (errno=%d)\n", 1222 if_name(ifp), ip6_sprintf(&llsol), 1223 error)); 1224 } 1225 } 1226 } 1227 break; 1228 1229 case RTM_DELETE: 1230 if (!ln) 1231 break; 1232 /* leave from solicited node multicast for proxy ND */ 1233 if ((rt->rt_flags & RTF_ANNOUNCE) != 0 && 1234 (ifp->if_flags & IFF_MULTICAST) != 0) { 1235 struct in6_addr llsol; 1236 struct in6_multi *in6m; 1237 1238 llsol = SIN6(rt_key(rt))->sin6_addr; 1239 llsol.s6_addr16[0] = htons(0xff02); 1240 llsol.s6_addr16[1] = htons(ifp->if_index); 1241 llsol.s6_addr32[1] = 0; 1242 llsol.s6_addr32[2] = htonl(1); 1243 llsol.s6_addr8[12] = 0xff; 1244 1245 IN6_LOOKUP_MULTI(llsol, ifp, in6m); 1246 if (in6m) 1247 in6_delmulti(in6m); 1248 } 1249 nd6_inuse--; 1250 ln->ln_next->ln_prev = ln->ln_prev; 1251 ln->ln_prev->ln_next = ln->ln_next; 1252 ln->ln_prev = NULL; 1253 rt->rt_llinfo = 0; 1254 rt->rt_flags &= ~RTF_LLINFO; 1255 if (ln->ln_hold) 1256 m_freem(ln->ln_hold); 1257 Free((caddr_t)ln); 1258 } 1259 } 1260 1261 void 1262 nd6_p2p_rtrequest(req, rt, info) 1263 int req; 1264 struct rtentry *rt; 1265 struct rt_addrinfo *info; /* xxx unused */ 1266 { 1267 struct sockaddr *gate = rt->rt_gateway; 1268 static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK}; 1269 struct ifnet *ifp = rt->rt_ifp; 1270 struct ifaddr *ifa; 1271 1272 if (rt->rt_flags & RTF_GATEWAY) 1273 return; 1274 1275 switch (req) { 1276 case RTM_ADD: 1277 /* 1278 * There is no backward compatibility :) 1279 * 1280 * if ((rt->rt_flags & RTF_HOST) == 0 && 1281 * SIN(rt_mask(rt))->sin_addr.s_addr != 0xffffffff) 1282 * rt->rt_flags |= RTF_CLONING; 1283 */ 1284 if (rt->rt_flags & RTF_CLONING) { 1285 /* 1286 * Case 1: This route should come from 1287 * a route to interface. 1288 */ 1289 rt_setgate(rt, rt_key(rt), 1290 (struct sockaddr *)&null_sdl); 1291 gate = rt->rt_gateway; 1292 SDL(gate)->sdl_type = ifp->if_type; 1293 SDL(gate)->sdl_index = ifp->if_index; 1294 break; 1295 } 1296 /* Announce a new entry if requested. */ 1297 if (rt->rt_flags & RTF_ANNOUNCE) 1298 nd6_na_output(ifp, 1299 &SIN6(rt_key(rt))->sin6_addr, 1300 &SIN6(rt_key(rt))->sin6_addr, 1301 ip6_forwarding ? ND_NA_FLAG_ROUTER : 0, 1302 1, NULL); 1303 /* FALLTHROUGH */ 1304 case RTM_RESOLVE: 1305 /* 1306 * check if rt_key(rt) is one of my address assigned 1307 * to the interface. 1308 */ 1309 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(rt->rt_ifp, 1310 &SIN6(rt_key(rt))->sin6_addr); 1311 if (ifa) { 1312 if (nd6_useloopback) { 1313 rt->rt_ifp = &loif[0]; /*XXX*/ 1314 } 1315 } 1316 break; 1317 } 1318 } 1319 1320 int 1321 nd6_ioctl(cmd, data, ifp) 1322 u_long cmd; 1323 caddr_t data; 1324 struct ifnet *ifp; 1325 { 1326 struct in6_drlist *drl = (struct in6_drlist *)data; 1327 struct in6_prlist *prl = (struct in6_prlist *)data; 1328 struct in6_ndireq *ndi = (struct in6_ndireq *)data; 1329 struct in6_nbrinfo *nbi = (struct in6_nbrinfo *)data; 1330 struct in6_ndifreq *ndif = (struct in6_ndifreq *)data; 1331 struct nd_defrouter *dr, any; 1332 struct nd_prefix *pr; 1333 struct rtentry *rt; 1334 int i = 0, error = 0; 1335 int s; 1336 1337 switch (cmd) { 1338 case SIOCGDRLST_IN6: 1339 bzero(drl, sizeof(*drl)); 1340 s = splsoftnet(); 1341 dr = TAILQ_FIRST(&nd_defrouter); 1342 while (dr && i < DRLSTSIZ) { 1343 drl->defrouter[i].rtaddr = dr->rtaddr; 1344 if (IN6_IS_ADDR_LINKLOCAL(&drl->defrouter[i].rtaddr)) { 1345 /* XXX: need to this hack for KAME stack */ 1346 drl->defrouter[i].rtaddr.s6_addr16[1] = 0; 1347 } else 1348 log(LOG_ERR, 1349 "default router list contains a " 1350 "non-linklocal address(%s)\n", 1351 ip6_sprintf(&drl->defrouter[i].rtaddr)); 1352 1353 drl->defrouter[i].flags = dr->flags; 1354 drl->defrouter[i].rtlifetime = dr->rtlifetime; 1355 drl->defrouter[i].expire = dr->expire; 1356 drl->defrouter[i].if_index = dr->ifp->if_index; 1357 i++; 1358 dr = TAILQ_NEXT(dr, dr_entry); 1359 } 1360 splx(s); 1361 break; 1362 case SIOCGPRLST_IN6: 1363 /* 1364 * XXX meaning of fields, especialy "raflags", is very 1365 * differnet between RA prefix list and RR/static prefix list. 1366 * how about separating ioctls into two? 1367 */ 1368 bzero(prl, sizeof(*prl)); 1369 s = splsoftnet(); 1370 pr = nd_prefix.lh_first; 1371 while (pr && i < PRLSTSIZ) { 1372 struct nd_pfxrouter *pfr; 1373 int j; 1374 1375 prl->prefix[i].prefix = pr->ndpr_prefix.sin6_addr; 1376 prl->prefix[i].raflags = pr->ndpr_raf; 1377 prl->prefix[i].prefixlen = pr->ndpr_plen; 1378 prl->prefix[i].vltime = pr->ndpr_vltime; 1379 prl->prefix[i].pltime = pr->ndpr_pltime; 1380 prl->prefix[i].if_index = pr->ndpr_ifp->if_index; 1381 prl->prefix[i].expire = pr->ndpr_expire; 1382 1383 pfr = pr->ndpr_advrtrs.lh_first; 1384 j = 0; 1385 while (pfr) { 1386 if (j < DRLSTSIZ) { 1387 #define RTRADDR prl->prefix[i].advrtr[j] 1388 RTRADDR = pfr->router->rtaddr; 1389 if (IN6_IS_ADDR_LINKLOCAL(&RTRADDR)) { 1390 /* XXX: hack for KAME */ 1391 RTRADDR.s6_addr16[1] = 0; 1392 } else 1393 log(LOG_ERR, 1394 "a router(%s) advertises " 1395 "a prefix with " 1396 "non-link local address\n", 1397 ip6_sprintf(&RTRADDR)); 1398 #undef RTRADDR 1399 } 1400 j++; 1401 pfr = pfr->pfr_next; 1402 } 1403 prl->prefix[i].advrtrs = j; 1404 prl->prefix[i].origin = PR_ORIG_RA; 1405 1406 i++; 1407 pr = pr->ndpr_next; 1408 } 1409 { 1410 struct rr_prefix *rpp; 1411 1412 for (rpp = LIST_FIRST(&rr_prefix); rpp; 1413 rpp = LIST_NEXT(rpp, rp_entry)) { 1414 if (i >= PRLSTSIZ) 1415 break; 1416 prl->prefix[i].prefix = rpp->rp_prefix.sin6_addr; 1417 prl->prefix[i].raflags = rpp->rp_raf; 1418 prl->prefix[i].prefixlen = rpp->rp_plen; 1419 prl->prefix[i].vltime = rpp->rp_vltime; 1420 prl->prefix[i].pltime = rpp->rp_pltime; 1421 prl->prefix[i].if_index = rpp->rp_ifp->if_index; 1422 prl->prefix[i].expire = rpp->rp_expire; 1423 prl->prefix[i].advrtrs = 0; 1424 prl->prefix[i].origin = rpp->rp_origin; 1425 i++; 1426 } 1427 } 1428 splx(s); 1429 1430 break; 1431 case SIOCGIFINFO_IN6: 1432 if (!nd_ifinfo || i >= nd_ifinfo_indexlim) { 1433 error = EINVAL; 1434 break; 1435 } 1436 ndi->ndi = nd_ifinfo[ifp->if_index]; 1437 break; 1438 case SIOCSIFINFO_FLAGS: 1439 /* XXX: almost all other fields of ndi->ndi is unused */ 1440 if (!nd_ifinfo || i >= nd_ifinfo_indexlim) { 1441 error = EINVAL; 1442 break; 1443 } 1444 nd_ifinfo[ifp->if_index].flags = ndi->ndi.flags; 1445 break; 1446 case SIOCSNDFLUSH_IN6: /* XXX: the ioctl name is confusing... */ 1447 /* flush default router list */ 1448 /* 1449 * xxx sumikawa: should not delete route if default 1450 * route equals to the top of default router list 1451 */ 1452 bzero(&any, sizeof(any)); 1453 defrouter_delreq(&any, 0); 1454 defrouter_select(); 1455 /* xxx sumikawa: flush prefix list */ 1456 break; 1457 case SIOCSPFXFLUSH_IN6: 1458 { 1459 /* flush all the prefix advertised by routers */ 1460 struct nd_prefix *pr, *next; 1461 1462 s = splsoftnet(); 1463 for (pr = nd_prefix.lh_first; pr; pr = next) { 1464 next = pr->ndpr_next; 1465 if (!IN6_IS_ADDR_UNSPECIFIED(&pr->ndpr_addr)) 1466 in6_ifdel(pr->ndpr_ifp, &pr->ndpr_addr); 1467 prelist_remove(pr); 1468 } 1469 splx(s); 1470 break; 1471 } 1472 case SIOCSRTRFLUSH_IN6: 1473 { 1474 /* flush all the default routers */ 1475 struct nd_defrouter *dr, *next; 1476 1477 s = splsoftnet(); 1478 if ((dr = TAILQ_FIRST(&nd_defrouter)) != NULL) { 1479 /* 1480 * The first entry of the list may be stored in 1481 * the routing table, so we'll delete it later. 1482 */ 1483 for (dr = TAILQ_NEXT(dr, dr_entry); dr; dr = next) { 1484 next = TAILQ_NEXT(dr, dr_entry); 1485 defrtrlist_del(dr); 1486 } 1487 defrtrlist_del(TAILQ_FIRST(&nd_defrouter)); 1488 } 1489 splx(s); 1490 break; 1491 } 1492 case SIOCGNBRINFO_IN6: 1493 { 1494 struct llinfo_nd6 *ln; 1495 struct in6_addr nb_addr = nbi->addr; /* make local for safety */ 1496 1497 /* 1498 * XXX: KAME specific hack for scoped addresses 1499 * XXXX: for other scopes than link-local? 1500 */ 1501 if (IN6_IS_ADDR_LINKLOCAL(&nbi->addr) || 1502 IN6_IS_ADDR_MC_LINKLOCAL(&nbi->addr)) { 1503 u_int16_t *idp = (u_int16_t *)&nb_addr.s6_addr[2]; 1504 1505 if (*idp == 0) 1506 *idp = htons(ifp->if_index); 1507 } 1508 1509 s = splsoftnet(); 1510 if ((rt = nd6_lookup(&nb_addr, 0, ifp)) == NULL) { 1511 error = EINVAL; 1512 splx(s); 1513 break; 1514 } 1515 ln = (struct llinfo_nd6 *)rt->rt_llinfo; 1516 nbi->state = ln->ln_state; 1517 nbi->asked = ln->ln_asked; 1518 nbi->isrouter = ln->ln_router; 1519 nbi->expire = ln->ln_expire; 1520 splx(s); 1521 1522 break; 1523 } 1524 case SIOCGDEFIFACE_IN6: /* XXX: should be implemented as a sysctl? */ 1525 ndif->ifindex = nd6_defifindex; 1526 break; 1527 case SIOCSDEFIFACE_IN6: /* XXX: should be implemented as a sysctl? */ 1528 return(nd6_setdefaultiface(ndif->ifindex)); 1529 break; 1530 } 1531 return(error); 1532 } 1533 1534 /* 1535 * Create neighbor cache entry and cache link-layer address, 1536 * on reception of inbound ND6 packets. (RS/RA/NS/redirect) 1537 */ 1538 struct rtentry * 1539 nd6_cache_lladdr(ifp, from, lladdr, lladdrlen, type, code) 1540 struct ifnet *ifp; 1541 struct in6_addr *from; 1542 char *lladdr; 1543 int lladdrlen; 1544 int type; /* ICMP6 type */ 1545 int code; /* type dependent information */ 1546 { 1547 struct rtentry *rt = NULL; 1548 struct llinfo_nd6 *ln = NULL; 1549 int is_newentry; 1550 struct sockaddr_dl *sdl = NULL; 1551 int do_update; 1552 int olladdr; 1553 int llchange; 1554 int newstate = 0; 1555 long time_second = time.tv_sec; 1556 1557 if (!ifp) 1558 panic("ifp == NULL in nd6_cache_lladdr"); 1559 if (!from) 1560 panic("from == NULL in nd6_cache_lladdr"); 1561 1562 /* nothing must be updated for unspecified address */ 1563 if (IN6_IS_ADDR_UNSPECIFIED(from)) 1564 return NULL; 1565 1566 /* 1567 * Validation about ifp->if_addrlen and lladdrlen must be done in 1568 * the caller. 1569 * 1570 * XXX If the link does not have link-layer adderss, what should 1571 * we do? (ifp->if_addrlen == 0) 1572 * Spec says nothing in sections for RA, RS and NA. There's small 1573 * description on it in NS section (RFC 2461 7.2.3). 1574 */ 1575 1576 rt = nd6_lookup(from, 0, ifp); 1577 if (!rt) { 1578 #if 0 1579 /* nothing must be done if there's no lladdr */ 1580 if (!lladdr || !lladdrlen) 1581 return NULL; 1582 #endif 1583 1584 rt = nd6_lookup(from, 1, ifp); 1585 is_newentry = 1; 1586 } else { 1587 /* do nothing if static ndp is set */ 1588 if (rt->rt_flags & RTF_STATIC) 1589 return NULL; 1590 is_newentry = 0; 1591 } 1592 1593 if (!rt) 1594 return NULL; 1595 if ((rt->rt_flags & (RTF_GATEWAY | RTF_LLINFO)) != RTF_LLINFO) { 1596 fail: 1597 (void)nd6_free(rt); 1598 return NULL; 1599 } 1600 ln = (struct llinfo_nd6 *)rt->rt_llinfo; 1601 if (!ln) 1602 goto fail; 1603 if (!rt->rt_gateway) 1604 goto fail; 1605 if (rt->rt_gateway->sa_family != AF_LINK) 1606 goto fail; 1607 sdl = SDL(rt->rt_gateway); 1608 1609 olladdr = (sdl->sdl_alen) ? 1 : 0; 1610 if (olladdr && lladdr) { 1611 if (bcmp(lladdr, LLADDR(sdl), ifp->if_addrlen)) 1612 llchange = 1; 1613 else 1614 llchange = 0; 1615 } else 1616 llchange = 0; 1617 1618 /* 1619 * newentry olladdr lladdr llchange (*=record) 1620 * 0 n n -- (1) 1621 * 0 y n -- (2) 1622 * 0 n y -- (3) * STALE 1623 * 0 y y n (4) * 1624 * 0 y y y (5) * STALE 1625 * 1 -- n -- (6) NOSTATE(= PASSIVE) 1626 * 1 -- y -- (7) * STALE 1627 */ 1628 1629 if (lladdr) { /*(3-5) and (7)*/ 1630 /* 1631 * Record source link-layer address 1632 * XXX is it dependent to ifp->if_type? 1633 */ 1634 sdl->sdl_alen = ifp->if_addrlen; 1635 bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen); 1636 } 1637 1638 if (!is_newentry) { 1639 if ((!olladdr && lladdr) /*(3)*/ 1640 || (olladdr && lladdr && llchange)) { /*(5)*/ 1641 do_update = 1; 1642 newstate = ND6_LLINFO_STALE; 1643 } else /*(1-2,4)*/ 1644 do_update = 0; 1645 } else { 1646 do_update = 1; 1647 if (!lladdr) /*(6)*/ 1648 newstate = ND6_LLINFO_NOSTATE; 1649 else /*(7)*/ 1650 newstate = ND6_LLINFO_STALE; 1651 } 1652 1653 if (do_update) { 1654 /* 1655 * Update the state of the neighbor cache. 1656 */ 1657 ln->ln_state = newstate; 1658 1659 if (ln->ln_state == ND6_LLINFO_STALE) { 1660 /* 1661 * XXX: since nd6_output() below will cause 1662 * state tansition to DELAY and reset the timer, 1663 * we must set the timer now, although it is actually 1664 * meaningless. 1665 */ 1666 ln->ln_expire = time_second + nd6_gctimer; 1667 1668 if (ln->ln_hold) { 1669 #ifdef OLDIP6OUTPUT 1670 ln->ln_asked = 0; 1671 ln->ln_state = ND6_LLINFO_DELAY; 1672 ln->ln_expire = time_second + nd6_delay; 1673 (*ifp->if_output)(ifp, ln->ln_hold, 1674 rt_key(rt), rt); 1675 #else 1676 /* 1677 * we assume ifp is not a p2p here, so just 1678 * set the 2nd argument as the 1st one. 1679 */ 1680 nd6_output(ifp, ifp, ln->ln_hold, 1681 (struct sockaddr_in6 *)rt_key(rt), 1682 rt); 1683 #endif 1684 ln->ln_hold = NULL; 1685 } 1686 } else if (ln->ln_state == ND6_LLINFO_INCOMPLETE) { 1687 /* probe right away */ 1688 ln->ln_expire = time_second; 1689 } 1690 } 1691 1692 /* 1693 * ICMP6 type dependent behavior. 1694 * 1695 * NS: clear IsRouter if new entry 1696 * RS: clear IsRouter 1697 * RA: set IsRouter if there's lladdr 1698 * redir: clear IsRouter if new entry 1699 * 1700 * RA case, (1): 1701 * The spec says that we must set IsRouter in the following cases: 1702 * - If lladdr exist, set IsRouter. This means (1-5). 1703 * - If it is old entry (!newentry), set IsRouter. This means (7). 1704 * So, based on the spec, in (1-5) and (7) cases we must set IsRouter. 1705 * A quetion arises for (1) case. (1) case has no lladdr in the 1706 * neighbor cache, this is similar to (6). 1707 * This case is rare but we figured that we MUST NOT set IsRouter. 1708 * 1709 * newentry olladdr lladdr llchange NS RS RA redir 1710 * D R 1711 * 0 n n -- (1) c ? s 1712 * 0 y n -- (2) c s s 1713 * 0 n y -- (3) c s s 1714 * 0 y y n (4) c s s 1715 * 0 y y y (5) c s s 1716 * 1 -- n -- (6) c c c s 1717 * 1 -- y -- (7) c c s c s 1718 * 1719 * (c=clear s=set) 1720 */ 1721 switch (type & 0xff) { 1722 case ND_NEIGHBOR_SOLICIT: 1723 /* 1724 * New entry must have is_router flag cleared. 1725 */ 1726 if (is_newentry) /*(6-7)*/ 1727 ln->ln_router = 0; 1728 break; 1729 case ND_REDIRECT: 1730 /* 1731 * If the icmp is a redirect to a better router, always set the 1732 * is_router flag. Otherwise, if the entry is newly created, 1733 * clear the flag. [RFC 2461, sec 8.3] 1734 */ 1735 if (code == ND_REDIRECT_ROUTER) 1736 ln->ln_router = 1; 1737 else if (is_newentry) /*(6-7)*/ 1738 ln->ln_router = 0; 1739 break; 1740 case ND_ROUTER_SOLICIT: 1741 /* 1742 * is_router flag must always be cleared. 1743 */ 1744 ln->ln_router = 0; 1745 break; 1746 case ND_ROUTER_ADVERT: 1747 /* 1748 * Mark an entry with lladdr as a router. 1749 */ 1750 if ((!is_newentry && (olladdr || lladdr)) /*(2-5)*/ 1751 || (is_newentry && lladdr)) { /*(7)*/ 1752 ln->ln_router = 1; 1753 } 1754 break; 1755 } 1756 1757 return rt; 1758 } 1759 1760 static void 1761 nd6_slowtimo(ignored_arg) 1762 void *ignored_arg; 1763 { 1764 int s = splsoftnet(); 1765 int i; 1766 struct nd_ifinfo *nd6if; 1767 1768 callout_reset(&nd6_slowtimo_ch, ND6_SLOWTIMER_INTERVAL * hz, 1769 nd6_slowtimo, NULL); 1770 for (i = 1; i < if_index + 1; i++) { 1771 if (!nd_ifinfo || i >= nd_ifinfo_indexlim) 1772 continue; 1773 nd6if = &nd_ifinfo[i]; 1774 if (nd6if->basereachable && /* already initialized */ 1775 (nd6if->recalctm -= ND6_SLOWTIMER_INTERVAL) <= 0) { 1776 /* 1777 * Since reachable time rarely changes by router 1778 * advertisements, we SHOULD insure that a new random 1779 * value gets recomputed at least once every few hours. 1780 * (RFC 2461, 6.3.4) 1781 */ 1782 nd6if->recalctm = nd6_recalc_reachtm_interval; 1783 nd6if->reachable = ND_COMPUTE_RTIME(nd6if->basereachable); 1784 } 1785 } 1786 splx(s); 1787 } 1788 1789 #define senderr(e) { error = (e); goto bad;} 1790 int 1791 nd6_output(ifp, origifp, m0, dst, rt0) 1792 struct ifnet *ifp; 1793 struct ifnet *origifp; 1794 struct mbuf *m0; 1795 struct sockaddr_in6 *dst; 1796 struct rtentry *rt0; 1797 { 1798 struct mbuf *m = m0; 1799 struct rtentry *rt = rt0; 1800 struct sockaddr_in6 *gw6 = NULL; 1801 struct llinfo_nd6 *ln = NULL; 1802 int error = 0; 1803 long time_second = time.tv_sec; 1804 1805 if (IN6_IS_ADDR_MULTICAST(&dst->sin6_addr)) 1806 goto sendpkt; 1807 1808 /* 1809 * XXX: we currently do not make neighbor cache on any interface 1810 * other than ARCnet, Ethernet, FDDI and GIF. 1811 * 1812 * RFC2893 says: 1813 * - unidirectional tunnels needs no ND 1814 */ 1815 switch (ifp->if_type) { 1816 case IFT_ARCNET: 1817 case IFT_ETHER: 1818 case IFT_FDDI: 1819 case IFT_IEEE1394: 1820 case IFT_GIF: /* XXX need more cases? */ 1821 break; 1822 default: 1823 goto sendpkt; 1824 } 1825 1826 /* 1827 * next hop determination. This routine is derived from ether_outpout. 1828 */ 1829 if (rt) { 1830 if ((rt->rt_flags & RTF_UP) == 0) { 1831 if ((rt0 = rt = rtalloc1((struct sockaddr *)dst, 1)) != 1832 NULL) 1833 { 1834 rt->rt_refcnt--; 1835 if (rt->rt_ifp != ifp) { 1836 /* XXX: loop care? */ 1837 return nd6_output(ifp, origifp, m0, 1838 dst, rt); 1839 } 1840 } else 1841 senderr(EHOSTUNREACH); 1842 } 1843 1844 if (rt->rt_flags & RTF_GATEWAY) { 1845 gw6 = (struct sockaddr_in6 *)rt->rt_gateway; 1846 1847 /* 1848 * We skip link-layer address resolution and NUD 1849 * if the gateway is not a neighbor from ND point 1850 * of view, regardless the value of the 1851 * nd_ifinfo.flags. 1852 * The second condition is a bit tricky: we skip 1853 * if the gateway is our own address, which is 1854 * sometimes used to install a route to a p2p link. 1855 */ 1856 if (!nd6_is_addr_neighbor(gw6, ifp) || 1857 in6ifa_ifpwithaddr(ifp, &gw6->sin6_addr)) { 1858 /* 1859 * We allow this kind of tricky route only 1860 * when the outgoing interface is p2p. 1861 * XXX: we may need a more generic rule here. 1862 */ 1863 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) 1864 senderr(EHOSTUNREACH); 1865 1866 goto sendpkt; 1867 } 1868 1869 if (rt->rt_gwroute == 0) 1870 goto lookup; 1871 if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) { 1872 rtfree(rt); rt = rt0; 1873 lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1); 1874 if ((rt = rt->rt_gwroute) == 0) 1875 senderr(EHOSTUNREACH); 1876 } 1877 } 1878 } 1879 1880 /* 1881 * Address resolution or Neighbor Unreachability Detection 1882 * for the next hop. 1883 * At this point, the destination of the packet must be a unicast 1884 * or an anycast address(i.e. not a multicast). 1885 */ 1886 1887 /* Look up the neighbor cache for the nexthop */ 1888 if (rt && (rt->rt_flags & RTF_LLINFO) != 0) 1889 ln = (struct llinfo_nd6 *)rt->rt_llinfo; 1890 else { 1891 /* 1892 * Since nd6_is_addr_neighbor() internally calls nd6_lookup(), 1893 * the condition below is not very efficient. But we believe 1894 * it is tolerable, because this should be a rare case. 1895 */ 1896 if (nd6_is_addr_neighbor(dst, ifp) && 1897 (rt = nd6_lookup(&dst->sin6_addr, 1, ifp)) != NULL) 1898 ln = (struct llinfo_nd6 *)rt->rt_llinfo; 1899 } 1900 if (!ln || !rt) { 1901 if ((ifp->if_flags & IFF_POINTOPOINT) == 0 && 1902 !(nd_ifinfo[ifp->if_index].flags & ND6_IFF_PERFORMNUD)) { 1903 log(LOG_DEBUG, 1904 "nd6_output: can't allocate llinfo for %s " 1905 "(ln=%p, rt=%p)\n", 1906 ip6_sprintf(&dst->sin6_addr), ln, rt); 1907 senderr(EIO); /* XXX: good error? */ 1908 } 1909 1910 goto sendpkt; /* send anyway */ 1911 } 1912 1913 /* We don't have to do link-layer address resolution on a p2p link. */ 1914 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 && 1915 ln->ln_state < ND6_LLINFO_REACHABLE) { 1916 ln->ln_state = ND6_LLINFO_STALE; 1917 ln->ln_expire = time_second + nd6_gctimer; 1918 } 1919 1920 /* 1921 * The first time we send a packet to a neighbor whose entry is 1922 * STALE, we have to change the state to DELAY and a sets a timer to 1923 * expire in DELAY_FIRST_PROBE_TIME seconds to ensure do 1924 * neighbor unreachability detection on expiration. 1925 * (RFC 2461 7.3.3) 1926 */ 1927 if (ln->ln_state == ND6_LLINFO_STALE) { 1928 ln->ln_asked = 0; 1929 ln->ln_state = ND6_LLINFO_DELAY; 1930 ln->ln_expire = time_second + nd6_delay; 1931 } 1932 1933 /* 1934 * If the neighbor cache entry has a state other than INCOMPLETE 1935 * (i.e. its link-layer address is already reloved), just 1936 * send the packet. 1937 */ 1938 if (ln->ln_state > ND6_LLINFO_INCOMPLETE) 1939 goto sendpkt; 1940 1941 /* 1942 * There is a neighbor cache entry, but no ethernet address 1943 * response yet. Replace the held mbuf (if any) with this 1944 * latest one. 1945 * 1946 * XXX Does the code conform to rate-limiting rule? 1947 * (RFC 2461 7.2.2) 1948 */ 1949 if (ln->ln_state == ND6_LLINFO_NOSTATE) 1950 ln->ln_state = ND6_LLINFO_INCOMPLETE; 1951 if (ln->ln_hold) 1952 m_freem(ln->ln_hold); 1953 ln->ln_hold = m; 1954 if (ln->ln_expire) { 1955 if (ln->ln_asked < nd6_mmaxtries && 1956 ln->ln_expire < time_second) { 1957 ln->ln_asked++; 1958 ln->ln_expire = time_second + 1959 nd_ifinfo[ifp->if_index].retrans / 1000; 1960 nd6_ns_output(ifp, NULL, &dst->sin6_addr, ln, 0); 1961 } 1962 } 1963 return(0); 1964 1965 sendpkt: 1966 1967 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 1968 return((*ifp->if_output)(origifp, m, (struct sockaddr *)dst, 1969 rt)); 1970 } 1971 return((*ifp->if_output)(ifp, m, (struct sockaddr *)dst, rt)); 1972 1973 bad: 1974 if (m) 1975 m_freem(m); 1976 return (error); 1977 } 1978 #undef senderr 1979 1980 int 1981 nd6_storelladdr(ifp, rt, m, dst, desten) 1982 struct ifnet *ifp; 1983 struct rtentry *rt; 1984 struct mbuf *m; 1985 struct sockaddr *dst; 1986 u_char *desten; 1987 { 1988 struct sockaddr_dl *sdl; 1989 1990 if (m->m_flags & M_MCAST) { 1991 switch (ifp->if_type) { 1992 case IFT_ETHER: 1993 case IFT_FDDI: 1994 ETHER_MAP_IPV6_MULTICAST(&SIN6(dst)->sin6_addr, 1995 desten); 1996 return(1); 1997 case IFT_IEEE1394: 1998 bcopy(ifp->if_broadcastaddr, desten, ifp->if_addrlen); 1999 return(1); 2000 case IFT_ARCNET: 2001 *desten = 0; 2002 return(1); 2003 default: 2004 m_freem(m); 2005 return(0); 2006 } 2007 } 2008 2009 if (rt == NULL) { 2010 /* this could happen, if we could not allocate memory */ 2011 m_freem(m); 2012 return(0); 2013 } 2014 if (rt->rt_gateway->sa_family != AF_LINK) { 2015 printf("nd6_storelladdr: something odd happens\n"); 2016 m_freem(m); 2017 return(0); 2018 } 2019 sdl = SDL(rt->rt_gateway); 2020 if (sdl->sdl_alen == 0) { 2021 /* this should be impossible, but we bark here for debugging */ 2022 printf("nd6_storelladdr: sdl_alen == 0\n"); 2023 m_freem(m); 2024 return(0); 2025 } 2026 2027 bcopy(LLADDR(sdl), desten, sdl->sdl_alen); 2028 return(1); 2029 } 2030
Indexes created Mon Sep 22 05:09:51 GMT 2025