1 /* $NetBSD: icmp6.c,v 1.107 2004/05/25 04:34:00 atatat Exp $ */ 2 /* $KAME: icmp6.c,v 1.217 2001/06/20 15:03:29 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 * Copyright (c) 1982, 1986, 1988, 1993 35 * The Regents of the University of California. All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. Neither the name of the University nor the names of its contributors 46 * may be used to endorse or promote products derived from this software 47 * without specific prior written permission. 48 * 49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 59 * SUCH DAMAGE. 60 * 61 * @(#)ip_icmp.c 8.2 (Berkeley) 1/4/94 62 */ 63 64 #include <sys/cdefs.h> 65 __KERNEL_RCSID(0, "$NetBSD: icmp6.c,v 1.107 2004/05/25 04:34:00 atatat Exp $"); 66 67 #include "opt_inet.h" 68 #include "opt_ipsec.h" 69 70 #include <sys/param.h> 71 #include <sys/systm.h> 72 #include <sys/malloc.h> 73 #include <sys/mbuf.h> 74 #include <sys/protosw.h> 75 #include <sys/socket.h> 76 #include <sys/socketvar.h> 77 #include <sys/time.h> 78 #include <sys/kernel.h> 79 #include <sys/syslog.h> 80 #include <sys/domain.h> 81 #include <sys/sysctl.h> 82 83 #include <net/if.h> 84 #include <net/route.h> 85 #include <net/if_dl.h> 86 #include <net/if_types.h> 87 88 #include <netinet/in.h> 89 #include <netinet/in_var.h> 90 #include <netinet/ip6.h> 91 #include <netinet6/ip6_var.h> 92 #include <netinet/icmp6.h> 93 #include <netinet6/mld6_var.h> 94 #include <netinet6/in6_pcb.h> 95 #include <netinet6/nd6.h> 96 #include <netinet6/in6_ifattach.h> 97 #include <netinet6/ip6protosw.h> 98 99 #ifdef IPSEC 100 #include <netinet6/ipsec.h> 101 #include <netkey/key.h> 102 #endif 103 104 #include "faith.h" 105 #if defined(NFAITH) && 0 < NFAITH 106 #include <net/if_faith.h> 107 #endif 108 109 #include <net/net_osdep.h> 110 111 extern struct domain inet6domain; 112 113 struct icmp6stat icmp6stat; 114 115 extern struct inpcbtable raw6cbtable; 116 extern int icmp6errppslim; 117 static int icmp6errpps_count = 0; 118 static struct timeval icmp6errppslim_last; 119 extern int icmp6_nodeinfo; 120 121 /* 122 * List of callbacks to notify when Path MTU changes are made. 123 */ 124 struct icmp6_mtudisc_callback { 125 LIST_ENTRY(icmp6_mtudisc_callback) mc_list; 126 void (*mc_func) __P((struct in6_addr *)); 127 }; 128 129 LIST_HEAD(, icmp6_mtudisc_callback) icmp6_mtudisc_callbacks = 130 LIST_HEAD_INITIALIZER(&icmp6_mtudisc_callbacks); 131 132 static struct rttimer_queue *icmp6_mtudisc_timeout_q = NULL; 133 extern int pmtu_expire; 134 135 /* XXX do these values make any sense? */ 136 static int icmp6_mtudisc_hiwat = 1280; 137 static int icmp6_mtudisc_lowat = 256; 138 139 /* 140 * keep track of # of redirect routes. 141 */ 142 static struct rttimer_queue *icmp6_redirect_timeout_q = NULL; 143 144 /* XXX experimental, turned off */ 145 static int icmp6_redirect_hiwat = -1; 146 static int icmp6_redirect_lowat = -1; 147 148 static void icmp6_errcount __P((struct icmp6errstat *, int, int)); 149 static int icmp6_rip6_input __P((struct mbuf **, int)); 150 static int icmp6_ratelimit __P((const struct in6_addr *, const int, const int)); 151 static const char *icmp6_redirect_diag __P((struct in6_addr *, 152 struct in6_addr *, struct in6_addr *)); 153 static struct mbuf *ni6_input __P((struct mbuf *, int)); 154 static struct mbuf *ni6_nametodns __P((const char *, int, int)); 155 static int ni6_dnsmatch __P((const char *, int, const char *, int)); 156 static int ni6_addrs __P((struct icmp6_nodeinfo *, struct mbuf *, 157 struct ifnet **, char *)); 158 static int ni6_store_addrs __P((struct icmp6_nodeinfo *, struct icmp6_nodeinfo *, 159 struct ifnet *, int)); 160 static int icmp6_notify_error __P((struct mbuf *, int, int, int)); 161 static struct rtentry *icmp6_mtudisc_clone __P((struct sockaddr *)); 162 static void icmp6_mtudisc_timeout __P((struct rtentry *, struct rttimer *)); 163 static void icmp6_redirect_timeout __P((struct rtentry *, struct rttimer *)); 164 165 void 166 icmp6_init() 167 { 168 mld6_init(); 169 icmp6_mtudisc_timeout_q = rt_timer_queue_create(pmtu_expire); 170 icmp6_redirect_timeout_q = rt_timer_queue_create(icmp6_redirtimeout); 171 } 172 173 static void 174 icmp6_errcount(stat, type, code) 175 struct icmp6errstat *stat; 176 int type, code; 177 { 178 switch (type) { 179 case ICMP6_DST_UNREACH: 180 switch (code) { 181 case ICMP6_DST_UNREACH_NOROUTE: 182 stat->icp6errs_dst_unreach_noroute++; 183 return; 184 case ICMP6_DST_UNREACH_ADMIN: 185 stat->icp6errs_dst_unreach_admin++; 186 return; 187 case ICMP6_DST_UNREACH_BEYONDSCOPE: 188 stat->icp6errs_dst_unreach_beyondscope++; 189 return; 190 case ICMP6_DST_UNREACH_ADDR: 191 stat->icp6errs_dst_unreach_addr++; 192 return; 193 case ICMP6_DST_UNREACH_NOPORT: 194 stat->icp6errs_dst_unreach_noport++; 195 return; 196 } 197 break; 198 case ICMP6_PACKET_TOO_BIG: 199 stat->icp6errs_packet_too_big++; 200 return; 201 case ICMP6_TIME_EXCEEDED: 202 switch (code) { 203 case ICMP6_TIME_EXCEED_TRANSIT: 204 stat->icp6errs_time_exceed_transit++; 205 return; 206 case ICMP6_TIME_EXCEED_REASSEMBLY: 207 stat->icp6errs_time_exceed_reassembly++; 208 return; 209 } 210 break; 211 case ICMP6_PARAM_PROB: 212 switch (code) { 213 case ICMP6_PARAMPROB_HEADER: 214 stat->icp6errs_paramprob_header++; 215 return; 216 case ICMP6_PARAMPROB_NEXTHEADER: 217 stat->icp6errs_paramprob_nextheader++; 218 return; 219 case ICMP6_PARAMPROB_OPTION: 220 stat->icp6errs_paramprob_option++; 221 return; 222 } 223 break; 224 case ND_REDIRECT: 225 stat->icp6errs_redirect++; 226 return; 227 } 228 stat->icp6errs_unknown++; 229 } 230 231 /* 232 * Register a Path MTU Discovery callback. 233 */ 234 void 235 icmp6_mtudisc_callback_register(func) 236 void (*func) __P((struct in6_addr *)); 237 { 238 struct icmp6_mtudisc_callback *mc; 239 240 for (mc = LIST_FIRST(&icmp6_mtudisc_callbacks); mc != NULL; 241 mc = LIST_NEXT(mc, mc_list)) { 242 if (mc->mc_func == func) 243 return; 244 } 245 246 mc = malloc(sizeof(*mc), M_PCB, M_NOWAIT); 247 if (mc == NULL) 248 panic("icmp6_mtudisc_callback_register"); 249 250 mc->mc_func = func; 251 LIST_INSERT_HEAD(&icmp6_mtudisc_callbacks, mc, mc_list); 252 } 253 254 /* 255 * Generate an error packet of type error in response to bad IP6 packet. 256 */ 257 void 258 icmp6_error(m, type, code, param) 259 struct mbuf *m; 260 int type, code, param; 261 { 262 struct ip6_hdr *oip6, *nip6; 263 struct icmp6_hdr *icmp6; 264 u_int preplen; 265 int off; 266 int nxt; 267 268 icmp6stat.icp6s_error++; 269 270 /* count per-type-code statistics */ 271 icmp6_errcount(&icmp6stat.icp6s_outerrhist, type, code); 272 273 if (m->m_flags & M_DECRYPTED) { 274 icmp6stat.icp6s_canterror++; 275 goto freeit; 276 } 277 278 if (m->m_len < sizeof(struct ip6_hdr)) { 279 m = m_pullup(m, sizeof(struct ip6_hdr)); 280 if (m == NULL) 281 return; 282 } 283 oip6 = mtod(m, struct ip6_hdr *); 284 285 /* 286 * If the destination address of the erroneous packet is a multicast 287 * address, or the packet was sent using link-layer multicast, 288 * we should basically suppress sending an error (RFC 2463, Section 289 * 2.4). 290 * We have two exceptions (the item e.2 in that section): 291 * - the Pakcet Too Big message can be sent for path MTU discovery. 292 * - the Parameter Problem Message that can be allowed an icmp6 error 293 * in the option type field. This check has been done in 294 * ip6_unknown_opt(), so we can just check the type and code. 295 */ 296 if ((m->m_flags & (M_BCAST|M_MCAST) || 297 IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) && 298 (type != ICMP6_PACKET_TOO_BIG && 299 (type != ICMP6_PARAM_PROB || 300 code != ICMP6_PARAMPROB_OPTION))) 301 goto freeit; 302 303 /* 304 * RFC 2463, 2.4 (e.5): source address check. 305 * XXX: the case of anycast source? 306 */ 307 if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) || 308 IN6_IS_ADDR_MULTICAST(&oip6->ip6_src)) 309 goto freeit; 310 311 /* 312 * If we are about to send ICMPv6 against ICMPv6 error/redirect, 313 * don't do it. 314 */ 315 nxt = -1; 316 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 317 if (off >= 0 && nxt == IPPROTO_ICMPV6) { 318 struct icmp6_hdr *icp; 319 320 IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off, 321 sizeof(*icp)); 322 if (icp == NULL) { 323 icmp6stat.icp6s_tooshort++; 324 return; 325 } 326 if (icp->icmp6_type < ICMP6_ECHO_REQUEST || 327 icp->icmp6_type == ND_REDIRECT) { 328 /* 329 * ICMPv6 error 330 * Special case: for redirect (which is 331 * informational) we must not send icmp6 error. 332 */ 333 icmp6stat.icp6s_canterror++; 334 goto freeit; 335 } else { 336 /* ICMPv6 informational - send the error */ 337 } 338 } 339 #if 0 /* controversial */ 340 else if (off >= 0 && nxt == IPPROTO_ESP) { 341 /* 342 * It could be ICMPv6 error inside ESP. Take a safer side, 343 * don't respond. 344 */ 345 icmp6stat.icp6s_canterror++; 346 goto freeit; 347 } 348 #endif 349 else { 350 /* non-ICMPv6 - send the error */ 351 } 352 353 oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */ 354 355 /* Finally, do rate limitation check. */ 356 if (icmp6_ratelimit(&oip6->ip6_src, type, code)) { 357 icmp6stat.icp6s_toofreq++; 358 goto freeit; 359 } 360 361 /* 362 * OK, ICMP6 can be generated. 363 */ 364 365 if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN) 366 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len); 367 368 preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 369 M_PREPEND(m, preplen, M_DONTWAIT); 370 if (m && m->m_len < preplen) 371 m = m_pullup(m, preplen); 372 if (m == NULL) { 373 nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__)); 374 return; 375 } 376 377 nip6 = mtod(m, struct ip6_hdr *); 378 nip6->ip6_src = oip6->ip6_src; 379 nip6->ip6_dst = oip6->ip6_dst; 380 381 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_src)) 382 oip6->ip6_src.s6_addr16[1] = 0; 383 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_dst)) 384 oip6->ip6_dst.s6_addr16[1] = 0; 385 386 icmp6 = (struct icmp6_hdr *)(nip6 + 1); 387 icmp6->icmp6_type = type; 388 icmp6->icmp6_code = code; 389 icmp6->icmp6_pptr = htonl((u_int32_t)param); 390 391 /* 392 * icmp6_reflect() is designed to be in the input path. 393 * icmp6_error() can be called from both input and outut path, 394 * and if we are in output path rcvif could contain bogus value. 395 * clear m->m_pkthdr.rcvif for safety, we should have enough scope 396 * information in ip header (nip6). 397 */ 398 m->m_pkthdr.rcvif = NULL; 399 400 icmp6stat.icp6s_outhist[type]++; 401 icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */ 402 403 return; 404 405 freeit: 406 /* 407 * If we can't tell wheter or not we can generate ICMP6, free it. 408 */ 409 m_freem(m); 410 } 411 412 /* 413 * Process a received ICMP6 message. 414 */ 415 int 416 icmp6_input(mp, offp, proto) 417 struct mbuf **mp; 418 int *offp, proto; 419 { 420 struct mbuf *m = *mp, *n; 421 struct ip6_hdr *ip6, *nip6; 422 struct icmp6_hdr *icmp6, *nicmp6; 423 int off = *offp; 424 int icmp6len = m->m_pkthdr.len - *offp; 425 int code, sum, noff; 426 427 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_msg); 428 429 /* 430 * Locate icmp6 structure in mbuf, and check 431 * that not corrupted and of at least minimum length 432 */ 433 434 ip6 = mtod(m, struct ip6_hdr *); 435 if (icmp6len < sizeof(struct icmp6_hdr)) { 436 icmp6stat.icp6s_tooshort++; 437 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error); 438 goto freeit; 439 } 440 441 /* 442 * calculate the checksum 443 */ 444 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 445 if (icmp6 == NULL) { 446 icmp6stat.icp6s_tooshort++; 447 /* m is invalid */ 448 /*icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error);*/ 449 return IPPROTO_DONE; 450 } 451 KASSERT(IP6_HDR_ALIGNED_P(icmp6)); 452 code = icmp6->icmp6_code; 453 454 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) { 455 nd6log((LOG_ERR, 456 "ICMP6 checksum error(%d|%x) %s\n", 457 icmp6->icmp6_type, sum, ip6_sprintf(&ip6->ip6_src))); 458 icmp6stat.icp6s_checksum++; 459 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error); 460 goto freeit; 461 } 462 463 #if defined(NFAITH) && 0 < NFAITH 464 if (faithprefix(&ip6->ip6_dst)) { 465 /* 466 * Deliver very specific ICMP6 type only. 467 * This is important to deilver TOOBIG. Otherwise PMTUD 468 * will not work. 469 */ 470 switch (icmp6->icmp6_type) { 471 case ICMP6_DST_UNREACH: 472 case ICMP6_PACKET_TOO_BIG: 473 case ICMP6_TIME_EXCEEDED: 474 break; 475 default: 476 goto freeit; 477 } 478 } 479 #endif 480 481 icmp6stat.icp6s_inhist[icmp6->icmp6_type]++; 482 483 switch (icmp6->icmp6_type) { 484 case ICMP6_DST_UNREACH: 485 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_dstunreach); 486 switch (code) { 487 case ICMP6_DST_UNREACH_NOROUTE: 488 code = PRC_UNREACH_NET; 489 break; 490 case ICMP6_DST_UNREACH_ADMIN: 491 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_adminprohib); 492 code = PRC_UNREACH_PROTOCOL; /* is this a good code? */ 493 break; 494 case ICMP6_DST_UNREACH_ADDR: 495 code = PRC_HOSTDEAD; 496 break; 497 #ifdef COMPAT_RFC1885 498 case ICMP6_DST_UNREACH_NOTNEIGHBOR: 499 code = PRC_UNREACH_SRCFAIL; 500 break; 501 #else 502 case ICMP6_DST_UNREACH_BEYONDSCOPE: 503 /* I mean "source address was incorrect." */ 504 code = PRC_UNREACH_NET; 505 break; 506 #endif 507 case ICMP6_DST_UNREACH_NOPORT: 508 code = PRC_UNREACH_PORT; 509 break; 510 default: 511 goto badcode; 512 } 513 goto deliver; 514 515 case ICMP6_PACKET_TOO_BIG: 516 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_pkttoobig); 517 if (code != 0) 518 goto badcode; 519 520 code = PRC_MSGSIZE; 521 522 /* 523 * Updating the path MTU will be done after examining 524 * intermediate extension headers. 525 */ 526 goto deliver; 527 528 case ICMP6_TIME_EXCEEDED: 529 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_timeexceed); 530 switch (code) { 531 case ICMP6_TIME_EXCEED_TRANSIT: 532 code = PRC_TIMXCEED_INTRANS; 533 break; 534 case ICMP6_TIME_EXCEED_REASSEMBLY: 535 code = PRC_TIMXCEED_REASS; 536 break; 537 default: 538 goto badcode; 539 } 540 goto deliver; 541 542 case ICMP6_PARAM_PROB: 543 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_paramprob); 544 switch (code) { 545 case ICMP6_PARAMPROB_NEXTHEADER: 546 code = PRC_UNREACH_PROTOCOL; 547 break; 548 case ICMP6_PARAMPROB_HEADER: 549 case ICMP6_PARAMPROB_OPTION: 550 code = PRC_PARAMPROB; 551 break; 552 default: 553 goto badcode; 554 } 555 goto deliver; 556 557 case ICMP6_ECHO_REQUEST: 558 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echo); 559 if (code != 0) 560 goto badcode; 561 /* 562 * Copy mbuf to send to two data paths: userland socket(s), 563 * and to the querier (echo reply). 564 * m: a copy for socket, n: a copy for querier 565 */ 566 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 567 /* Give up local */ 568 n = m; 569 m = NULL; 570 goto deliverecho; 571 } 572 /* 573 * If the first mbuf is shared, or the first mbuf is too short, 574 * copy the first part of the data into a fresh mbuf. 575 * Otherwise, we will wrongly overwrite both copies. 576 */ 577 if ((n->m_flags & M_EXT) != 0 || 578 n->m_len < off + sizeof(struct icmp6_hdr)) { 579 struct mbuf *n0 = n; 580 const int maxlen = sizeof(*nip6) + sizeof(*nicmp6); 581 582 /* 583 * Prepare an internal mbuf. m_pullup() doesn't 584 * always copy the length we specified. 585 */ 586 if (maxlen >= MCLBYTES) { 587 /* Give up remote */ 588 m_freem(n0); 589 break; 590 } 591 MGETHDR(n, M_DONTWAIT, n0->m_type); 592 if (n && maxlen >= MHLEN) { 593 MCLGET(n, M_DONTWAIT); 594 if ((n->m_flags & M_EXT) == 0) { 595 m_free(n); 596 n = NULL; 597 } 598 } 599 if (n == NULL) { 600 /* Give up local */ 601 m_freem(n0); 602 n = m; 603 m = NULL; 604 goto deliverecho; 605 } 606 M_COPY_PKTHDR(n, n0); 607 /* 608 * Copy IPv6 and ICMPv6 only. 609 */ 610 nip6 = mtod(n, struct ip6_hdr *); 611 bcopy(ip6, nip6, sizeof(struct ip6_hdr)); 612 nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 613 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); 614 noff = sizeof(struct ip6_hdr); 615 n->m_len = noff + sizeof(struct icmp6_hdr); 616 /* 617 * Adjust mbuf. ip6_plen will be adjusted in 618 * ip6_output(). 619 * n->m_pkthdr.len == n0->m_pkthdr.len at this point. 620 */ 621 n->m_pkthdr.len += noff + sizeof(struct icmp6_hdr); 622 n->m_pkthdr.len -= (off + sizeof(struct icmp6_hdr)); 623 m_adj(n0, off + sizeof(struct icmp6_hdr)); 624 n->m_next = n0; 625 n0->m_flags &= ~M_PKTHDR; 626 } else { 627 deliverecho: 628 nip6 = mtod(n, struct ip6_hdr *); 629 nicmp6 = (struct icmp6_hdr *)((caddr_t)nip6 + off); 630 noff = off; 631 } 632 nicmp6->icmp6_type = ICMP6_ECHO_REPLY; 633 nicmp6->icmp6_code = 0; 634 if (n) { 635 icmp6stat.icp6s_reflect++; 636 icmp6stat.icp6s_outhist[ICMP6_ECHO_REPLY]++; 637 icmp6_reflect(n, noff); 638 } 639 if (!m) 640 goto freeit; 641 break; 642 643 case ICMP6_ECHO_REPLY: 644 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echoreply); 645 if (code != 0) 646 goto badcode; 647 break; 648 649 case MLD_LISTENER_QUERY: 650 case MLD_LISTENER_REPORT: 651 if (icmp6len < sizeof(struct mld_hdr)) 652 goto badlen; 653 if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */ 654 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldquery); 655 else 656 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldreport); 657 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 658 /* give up local */ 659 mld6_input(m, off); 660 m = NULL; 661 goto freeit; 662 } 663 mld6_input(n, off); 664 /* m stays. */ 665 break; 666 667 case MLD_LISTENER_DONE: 668 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mlddone); 669 if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */ 670 goto badlen; 671 break; /* nothing to be done in kernel */ 672 673 case MLD_MTRACE_RESP: 674 case MLD_MTRACE: 675 /* XXX: these two are experimental. not officially defined. */ 676 /* XXX: per-interface statistics? */ 677 break; /* just pass it to applications */ 678 679 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */ 680 { 681 enum { WRU, FQDN } mode; 682 683 if (!icmp6_nodeinfo) 684 break; 685 686 if (icmp6len == sizeof(struct icmp6_hdr) + 4) 687 mode = WRU; 688 else if (icmp6len >= sizeof(struct icmp6_nodeinfo)) 689 mode = FQDN; 690 else 691 goto badlen; 692 693 if (mode == FQDN) { 694 n = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 695 if (n) 696 n = ni6_input(n, off); 697 /* XXX meaningless if n == NULL */ 698 noff = sizeof(struct ip6_hdr); 699 } else { 700 u_char *p; 701 int maxlen, maxhlen; 702 703 if ((icmp6_nodeinfo & 5) != 5) 704 break; 705 706 if (code != 0) 707 goto badcode; 708 maxlen = sizeof(*nip6) + sizeof(*nicmp6) + 4; 709 if (maxlen >= MCLBYTES) { 710 /* Give up remote */ 711 break; 712 } 713 MGETHDR(n, M_DONTWAIT, m->m_type); 714 if (n && maxlen > MHLEN) { 715 MCLGET(n, M_DONTWAIT); 716 if ((n->m_flags & M_EXT) == 0) { 717 m_free(n); 718 n = NULL; 719 } 720 } 721 if (n == NULL) { 722 /* Give up remote */ 723 break; 724 } 725 n->m_pkthdr.rcvif = NULL; 726 n->m_len = 0; 727 maxhlen = M_TRAILINGSPACE(n) - maxlen; 728 if (maxhlen > hostnamelen) 729 maxhlen = hostnamelen; 730 /* 731 * Copy IPv6 and ICMPv6 only. 732 */ 733 nip6 = mtod(n, struct ip6_hdr *); 734 bcopy(ip6, nip6, sizeof(struct ip6_hdr)); 735 nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 736 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); 737 p = (u_char *)(nicmp6 + 1); 738 bzero(p, 4); 739 bcopy(hostname, p + 4, maxhlen); /* meaningless TTL */ 740 noff = sizeof(struct ip6_hdr); 741 M_COPY_PKTHDR(n, m); /* just for rcvif */ 742 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 743 sizeof(struct icmp6_hdr) + 4 + maxhlen; 744 nicmp6->icmp6_type = ICMP6_WRUREPLY; 745 nicmp6->icmp6_code = 0; 746 } 747 #undef hostnamelen 748 if (n) { 749 icmp6stat.icp6s_reflect++; 750 icmp6stat.icp6s_outhist[ICMP6_WRUREPLY]++; 751 icmp6_reflect(n, noff); 752 } 753 break; 754 } 755 756 case ICMP6_WRUREPLY: 757 if (code != 0) 758 goto badcode; 759 break; 760 761 case ND_ROUTER_SOLICIT: 762 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routersolicit); 763 if (code != 0) 764 goto badcode; 765 if (icmp6len < sizeof(struct nd_router_solicit)) 766 goto badlen; 767 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 768 /* give up local */ 769 nd6_rs_input(m, off, icmp6len); 770 m = NULL; 771 goto freeit; 772 } 773 nd6_rs_input(n, off, icmp6len); 774 /* m stays. */ 775 break; 776 777 case ND_ROUTER_ADVERT: 778 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routeradvert); 779 if (code != 0) 780 goto badcode; 781 if (icmp6len < sizeof(struct nd_router_advert)) 782 goto badlen; 783 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 784 /* give up local */ 785 nd6_ra_input(m, off, icmp6len); 786 m = NULL; 787 goto freeit; 788 } 789 nd6_ra_input(n, off, icmp6len); 790 /* m stays. */ 791 break; 792 793 case ND_NEIGHBOR_SOLICIT: 794 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighborsolicit); 795 if (code != 0) 796 goto badcode; 797 if (icmp6len < sizeof(struct nd_neighbor_solicit)) 798 goto badlen; 799 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 800 /* give up local */ 801 nd6_ns_input(m, off, icmp6len); 802 m = NULL; 803 goto freeit; 804 } 805 nd6_ns_input(n, off, icmp6len); 806 /* m stays. */ 807 break; 808 809 case ND_NEIGHBOR_ADVERT: 810 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighboradvert); 811 if (code != 0) 812 goto badcode; 813 if (icmp6len < sizeof(struct nd_neighbor_advert)) 814 goto badlen; 815 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 816 /* give up local */ 817 nd6_na_input(m, off, icmp6len); 818 m = NULL; 819 goto freeit; 820 } 821 nd6_na_input(n, off, icmp6len); 822 /* m stays. */ 823 break; 824 825 case ND_REDIRECT: 826 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_redirect); 827 if (code != 0) 828 goto badcode; 829 if (icmp6len < sizeof(struct nd_redirect)) 830 goto badlen; 831 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 832 /* give up local */ 833 icmp6_redirect_input(m, off); 834 m = NULL; 835 goto freeit; 836 } 837 icmp6_redirect_input(n, off); 838 /* m stays. */ 839 break; 840 841 case ICMP6_ROUTER_RENUMBERING: 842 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND && 843 code != ICMP6_ROUTER_RENUMBERING_RESULT) 844 goto badcode; 845 if (icmp6len < sizeof(struct icmp6_router_renum)) 846 goto badlen; 847 break; 848 849 default: 850 nd6log((LOG_DEBUG, 851 "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n", 852 icmp6->icmp6_type, ip6_sprintf(&ip6->ip6_src), 853 ip6_sprintf(&ip6->ip6_dst), 854 m->m_pkthdr.rcvif ? m->m_pkthdr.rcvif->if_index : 0)); 855 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) { 856 /* ICMPv6 error: MUST deliver it by spec... */ 857 code = PRC_NCMDS; 858 /* deliver */ 859 } else { 860 /* ICMPv6 informational: MUST not deliver */ 861 break; 862 } 863 deliver: 864 if (icmp6_notify_error(m, off, icmp6len, code)) { 865 /* In this case, m should've been freed. */ 866 return (IPPROTO_DONE); 867 } 868 break; 869 870 badcode: 871 icmp6stat.icp6s_badcode++; 872 break; 873 874 badlen: 875 icmp6stat.icp6s_badlen++; 876 break; 877 } 878 879 /* deliver the packet to appropriate sockets */ 880 icmp6_rip6_input(&m, *offp); 881 882 return IPPROTO_DONE; 883 884 freeit: 885 m_freem(m); 886 return IPPROTO_DONE; 887 } 888 889 static int 890 icmp6_notify_error(m, off, icmp6len, code) 891 struct mbuf *m; 892 int off, icmp6len; 893 { 894 struct icmp6_hdr *icmp6; 895 struct ip6_hdr *eip6; 896 u_int32_t notifymtu; 897 struct sockaddr_in6 icmp6src, icmp6dst; 898 899 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) { 900 icmp6stat.icp6s_tooshort++; 901 goto freeit; 902 } 903 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 904 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 905 if (icmp6 == NULL) { 906 icmp6stat.icp6s_tooshort++; 907 return (-1); 908 } 909 eip6 = (struct ip6_hdr *)(icmp6 + 1); 910 911 /* Detect the upper level protocol */ 912 { 913 void (*ctlfunc) __P((int, struct sockaddr *, void *)); 914 u_int8_t nxt = eip6->ip6_nxt; 915 int eoff = off + sizeof(struct icmp6_hdr) + 916 sizeof(struct ip6_hdr); 917 struct ip6ctlparam ip6cp; 918 struct in6_addr *finaldst = NULL; 919 int icmp6type = icmp6->icmp6_type; 920 struct ip6_frag *fh; 921 struct ip6_rthdr *rth; 922 struct ip6_rthdr0 *rth0; 923 int rthlen; 924 925 while (1) { /* XXX: should avoid infinite loop explicitly? */ 926 struct ip6_ext *eh; 927 928 switch (nxt) { 929 case IPPROTO_HOPOPTS: 930 case IPPROTO_DSTOPTS: 931 case IPPROTO_AH: 932 IP6_EXTHDR_GET(eh, struct ip6_ext *, m, 933 eoff, sizeof(*eh)); 934 if (eh == NULL) { 935 icmp6stat.icp6s_tooshort++; 936 return (-1); 937 } 938 939 if (nxt == IPPROTO_AH) 940 eoff += (eh->ip6e_len + 2) << 2; 941 else 942 eoff += (eh->ip6e_len + 1) << 3; 943 nxt = eh->ip6e_nxt; 944 break; 945 case IPPROTO_ROUTING: 946 /* 947 * When the erroneous packet contains a 948 * routing header, we should examine the 949 * header to determine the final destination. 950 * Otherwise, we can't properly update 951 * information that depends on the final 952 * destination (e.g. path MTU). 953 */ 954 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m, 955 eoff, sizeof(*rth)); 956 if (rth == NULL) { 957 icmp6stat.icp6s_tooshort++; 958 return (-1); 959 } 960 rthlen = (rth->ip6r_len + 1) << 3; 961 /* 962 * XXX: currently there is no 963 * officially defined type other 964 * than type-0. 965 * Note that if the segment left field 966 * is 0, all intermediate hops must 967 * have been passed. 968 */ 969 if (rth->ip6r_segleft && 970 rth->ip6r_type == IPV6_RTHDR_TYPE_0) { 971 int hops; 972 973 IP6_EXTHDR_GET(rth0, 974 struct ip6_rthdr0 *, m, 975 eoff, rthlen); 976 if (rth0 == NULL) { 977 icmp6stat.icp6s_tooshort++; 978 return (-1); 979 } 980 /* just ignore a bogus header */ 981 if ((rth0->ip6r0_len % 2) == 0 && 982 (hops = rth0->ip6r0_len/2)) 983 finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1); 984 } 985 eoff += rthlen; 986 nxt = rth->ip6r_nxt; 987 break; 988 case IPPROTO_FRAGMENT: 989 IP6_EXTHDR_GET(fh, struct ip6_frag *, m, 990 eoff, sizeof(*fh)); 991 if (fh == NULL) { 992 icmp6stat.icp6s_tooshort++; 993 return (-1); 994 } 995 /* 996 * Data after a fragment header is meaningless 997 * unless it is the first fragment, but 998 * we'll go to the notify label for path MTU 999 * discovery. 1000 */ 1001 if (fh->ip6f_offlg & IP6F_OFF_MASK) 1002 goto notify; 1003 1004 eoff += sizeof(struct ip6_frag); 1005 nxt = fh->ip6f_nxt; 1006 break; 1007 default: 1008 /* 1009 * This case includes ESP and the No Next 1010 * Header. In such cases going to the notify 1011 * label does not have any meaning 1012 * (i.e. ctlfunc will be NULL), but we go 1013 * anyway since we might have to update 1014 * path MTU information. 1015 */ 1016 goto notify; 1017 } 1018 } 1019 notify: 1020 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 1021 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 1022 if (icmp6 == NULL) { 1023 icmp6stat.icp6s_tooshort++; 1024 return (-1); 1025 } 1026 1027 eip6 = (struct ip6_hdr *)(icmp6 + 1); 1028 bzero(&icmp6dst, sizeof(icmp6dst)); 1029 icmp6dst.sin6_len = sizeof(struct sockaddr_in6); 1030 icmp6dst.sin6_family = AF_INET6; 1031 if (finaldst == NULL) 1032 icmp6dst.sin6_addr = eip6->ip6_dst; 1033 else 1034 icmp6dst.sin6_addr = *finaldst; 1035 icmp6dst.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif, 1036 &icmp6dst.sin6_addr); 1037 #ifndef SCOPEDROUTING 1038 if (in6_embedscope(&icmp6dst.sin6_addr, &icmp6dst, 1039 NULL, NULL)) { 1040 /* should be impossbile */ 1041 nd6log((LOG_DEBUG, 1042 "icmp6_notify_error: in6_embedscope failed\n")); 1043 goto freeit; 1044 } 1045 #endif 1046 1047 /* 1048 * retrieve parameters from the inner IPv6 header, and convert 1049 * them into sockaddr structures. 1050 */ 1051 bzero(&icmp6src, sizeof(icmp6src)); 1052 icmp6src.sin6_len = sizeof(struct sockaddr_in6); 1053 icmp6src.sin6_family = AF_INET6; 1054 icmp6src.sin6_addr = eip6->ip6_src; 1055 icmp6src.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif, 1056 &icmp6src.sin6_addr); 1057 #ifndef SCOPEDROUTING 1058 if (in6_embedscope(&icmp6src.sin6_addr, &icmp6src, 1059 NULL, NULL)) { 1060 /* should be impossbile */ 1061 nd6log((LOG_DEBUG, 1062 "icmp6_notify_error: in6_embedscope failed\n")); 1063 goto freeit; 1064 } 1065 #endif 1066 icmp6src.sin6_flowinfo = 1067 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK); 1068 1069 if (finaldst == NULL) 1070 finaldst = &eip6->ip6_dst; 1071 ip6cp.ip6c_m = m; 1072 ip6cp.ip6c_icmp6 = icmp6; 1073 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1); 1074 ip6cp.ip6c_off = eoff; 1075 ip6cp.ip6c_finaldst = finaldst; 1076 ip6cp.ip6c_src = &icmp6src; 1077 ip6cp.ip6c_nxt = nxt; 1078 1079 if (icmp6type == ICMP6_PACKET_TOO_BIG) { 1080 notifymtu = ntohl(icmp6->icmp6_mtu); 1081 ip6cp.ip6c_cmdarg = (void *)¬ifymtu; 1082 } 1083 1084 ctlfunc = (void (*) __P((int, struct sockaddr *, void *))) 1085 (inet6sw[ip6_protox[nxt]].pr_ctlinput); 1086 if (ctlfunc) { 1087 (void) (*ctlfunc)(code, (struct sockaddr *)&icmp6dst, 1088 &ip6cp); 1089 } 1090 } 1091 return (0); 1092 1093 freeit: 1094 m_freem(m); 1095 return (-1); 1096 } 1097 1098 void 1099 icmp6_mtudisc_update(ip6cp, validated) 1100 struct ip6ctlparam *ip6cp; 1101 int validated; 1102 { 1103 unsigned long rtcount; 1104 struct icmp6_mtudisc_callback *mc; 1105 struct in6_addr *dst = ip6cp->ip6c_finaldst; 1106 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6; 1107 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */ 1108 u_int mtu = ntohl(icmp6->icmp6_mtu); 1109 struct rtentry *rt = NULL; 1110 struct sockaddr_in6 sin6; 1111 1112 /* 1113 * allow non-validated cases if memory is plenty, to make traffic 1114 * from non-connected pcb happy. 1115 */ 1116 rtcount = rt_timer_count(icmp6_mtudisc_timeout_q); 1117 if (validated) { 1118 if (0 <= icmp6_mtudisc_hiwat && rtcount > icmp6_mtudisc_hiwat) 1119 return; 1120 else if (0 <= icmp6_mtudisc_lowat && 1121 rtcount > icmp6_mtudisc_lowat) { 1122 /* 1123 * XXX nuke a victim, install the new one. 1124 */ 1125 } 1126 } else { 1127 if (0 <= icmp6_mtudisc_lowat && rtcount > icmp6_mtudisc_lowat) 1128 return; 1129 } 1130 1131 bzero(&sin6, sizeof(sin6)); 1132 sin6.sin6_family = PF_INET6; 1133 sin6.sin6_len = sizeof(struct sockaddr_in6); 1134 sin6.sin6_addr = *dst; 1135 /* XXX normally, this won't happen */ 1136 if (IN6_IS_ADDR_LINKLOCAL(dst)) { 1137 sin6.sin6_addr.s6_addr16[1] = 1138 htons(m->m_pkthdr.rcvif->if_index); 1139 } 1140 /* sin6.sin6_scope_id = XXX: should be set if DST is a scoped addr */ 1141 rt = icmp6_mtudisc_clone((struct sockaddr *)&sin6); 1142 1143 if (rt && (rt->rt_flags & RTF_HOST) && 1144 !(rt->rt_rmx.rmx_locks & RTV_MTU) && 1145 (rt->rt_rmx.rmx_mtu > mtu || rt->rt_rmx.rmx_mtu == 0)) { 1146 if (mtu < IN6_LINKMTU(rt->rt_ifp)) { 1147 icmp6stat.icp6s_pmtuchg++; 1148 rt->rt_rmx.rmx_mtu = mtu; 1149 } 1150 } 1151 if (rt) { /* XXX: need braces to avoid conflict with else in RTFREE. */ 1152 RTFREE(rt); 1153 } 1154 1155 /* 1156 * Notify protocols that the MTU for this destination 1157 * has changed. 1158 */ 1159 for (mc = LIST_FIRST(&icmp6_mtudisc_callbacks); mc != NULL; 1160 mc = LIST_NEXT(mc, mc_list)) 1161 (*mc->mc_func)(&sin6.sin6_addr); 1162 } 1163 1164 /* 1165 * Process a Node Information Query packet, based on 1166 * draft-ietf-ipngwg-icmp-name-lookups-07. 1167 * 1168 * Spec incompatibilities: 1169 * - IPv6 Subject address handling 1170 * - IPv4 Subject address handling support missing 1171 * - Proxy reply (answer even if it's not for me) 1172 * - joins NI group address at in6_ifattach() time only, does not cope 1173 * with hostname changes by sethostname(3) 1174 */ 1175 #ifndef offsetof /* XXX */ 1176 #define offsetof(type, member) ((size_t)(&((type *)0)->member)) 1177 #endif 1178 static struct mbuf * 1179 ni6_input(m, off) 1180 struct mbuf *m; 1181 int off; 1182 { 1183 struct icmp6_nodeinfo *ni6, *nni6; 1184 struct mbuf *n = NULL; 1185 u_int16_t qtype; 1186 int subjlen; 1187 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1188 struct ni_reply_fqdn *fqdn; 1189 int addrs; /* for NI_QTYPE_NODEADDR */ 1190 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */ 1191 struct sockaddr_in6 sin6; /* double meaning; ip6_dst and subjectaddr */ 1192 struct ip6_hdr *ip6; 1193 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */ 1194 char *subj = NULL; 1195 1196 ip6 = mtod(m, struct ip6_hdr *); 1197 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6)); 1198 if (ni6 == NULL) { 1199 /* m is already reclaimed */ 1200 return NULL; 1201 } 1202 1203 /* 1204 * Validate IPv6 destination address. 1205 * 1206 * The Responder must discard the Query without further processing 1207 * unless it is one of the Responder's unicast or anycast addresses, or 1208 * a link-local scope multicast address which the Responder has joined. 1209 * [icmp-name-lookups-07, Section 4.] 1210 */ 1211 bzero(&sin6, sizeof(sin6)); 1212 sin6.sin6_family = AF_INET6; 1213 sin6.sin6_len = sizeof(struct sockaddr_in6); 1214 bcopy(&ip6->ip6_dst, &sin6.sin6_addr, sizeof(sin6.sin6_addr)); 1215 /* XXX scopeid */ 1216 if (ifa_ifwithaddr((struct sockaddr *)&sin6)) 1217 ; /* unicast/anycast, fine */ 1218 else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr)) 1219 ; /* link-local multicast, fine */ 1220 else 1221 goto bad; 1222 1223 /* validate query Subject field. */ 1224 qtype = ntohs(ni6->ni_qtype); 1225 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo); 1226 switch (qtype) { 1227 case NI_QTYPE_NOOP: 1228 case NI_QTYPE_SUPTYPES: 1229 /* 07 draft */ 1230 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0) 1231 break; 1232 /* FALLTHROUGH */ 1233 case NI_QTYPE_FQDN: 1234 case NI_QTYPE_NODEADDR: 1235 switch (ni6->ni_code) { 1236 case ICMP6_NI_SUBJ_IPV6: 1237 #if ICMP6_NI_SUBJ_IPV6 != 0 1238 case 0: 1239 #endif 1240 /* 1241 * backward compatibility - try to accept 03 draft 1242 * format, where no Subject is present. 1243 */ 1244 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 && 1245 subjlen == 0) { 1246 oldfqdn++; 1247 break; 1248 } 1249 #if ICMP6_NI_SUBJ_IPV6 != 0 1250 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6) 1251 goto bad; 1252 #endif 1253 1254 if (subjlen != sizeof(sin6.sin6_addr)) 1255 goto bad; 1256 1257 /* 1258 * Validate Subject address. 1259 * 1260 * Not sure what exactly "address belongs to the node" 1261 * means in the spec, is it just unicast, or what? 1262 * 1263 * At this moment we consider Subject address as 1264 * "belong to the node" if the Subject address equals 1265 * to the IPv6 destination address; validation for 1266 * IPv6 destination address should have done enough 1267 * check for us. 1268 * 1269 * We do not do proxy at this moment. 1270 */ 1271 /* m_pulldown instead of copy? */ 1272 m_copydata(m, off + sizeof(struct icmp6_nodeinfo), 1273 subjlen, (caddr_t)&sin6.sin6_addr); 1274 /* XXX kame scope hack */ 1275 if (IN6_IS_SCOPE_LINKLOCAL(&sin6.sin6_addr)) { 1276 if ((m->m_flags & M_PKTHDR) != 0 && 1277 m->m_pkthdr.rcvif) { 1278 sin6.sin6_addr.s6_addr16[1] = 1279 htons(m->m_pkthdr.rcvif->if_index); 1280 } 1281 } 1282 subj = (char *)&sin6; 1283 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &sin6.sin6_addr)) 1284 break; 1285 1286 /* 1287 * XXX if we are to allow other cases, we should really 1288 * be careful about scope here. 1289 * basically, we should disallow queries toward IPv6 1290 * destination X with subject Y, if scope(X) > scope(Y). 1291 * if we allow scope(X) > scope(Y), it will result in 1292 * information leakage across scope boundary. 1293 */ 1294 goto bad; 1295 1296 case ICMP6_NI_SUBJ_FQDN: 1297 /* 1298 * Validate Subject name with gethostname(3). 1299 * 1300 * The behavior may need some debate, since: 1301 * - we are not sure if the node has FQDN as 1302 * hostname (returned by gethostname(3)). 1303 * - the code does wildcard match for truncated names. 1304 * however, we are not sure if we want to perform 1305 * wildcard match, if gethostname(3) side has 1306 * truncated hostname. 1307 */ 1308 n = ni6_nametodns(hostname, hostnamelen, 0); 1309 if (!n || n->m_next || n->m_len == 0) 1310 goto bad; 1311 IP6_EXTHDR_GET(subj, char *, m, 1312 off + sizeof(struct icmp6_nodeinfo), subjlen); 1313 if (subj == NULL) 1314 goto bad; 1315 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *), 1316 n->m_len)) { 1317 goto bad; 1318 } 1319 m_freem(n); 1320 n = NULL; 1321 break; 1322 1323 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */ 1324 default: 1325 goto bad; 1326 } 1327 break; 1328 } 1329 1330 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */ 1331 switch (qtype) { 1332 case NI_QTYPE_FQDN: 1333 if ((icmp6_nodeinfo & 1) == 0) 1334 goto bad; 1335 break; 1336 case NI_QTYPE_NODEADDR: 1337 if ((icmp6_nodeinfo & 2) == 0) 1338 goto bad; 1339 break; 1340 } 1341 1342 /* guess reply length */ 1343 switch (qtype) { 1344 case NI_QTYPE_NOOP: 1345 break; /* no reply data */ 1346 case NI_QTYPE_SUPTYPES: 1347 replylen += sizeof(u_int32_t); 1348 break; 1349 case NI_QTYPE_FQDN: 1350 /* XXX will append an mbuf */ 1351 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1352 break; 1353 case NI_QTYPE_NODEADDR: 1354 addrs = ni6_addrs(ni6, m, &ifp, subj); 1355 if ((replylen += addrs * (sizeof(struct in6_addr) + 1356 sizeof(u_int32_t))) > MCLBYTES) 1357 replylen = MCLBYTES; /* XXX: will truncate pkt later */ 1358 break; 1359 default: 1360 /* 1361 * XXX: We must return a reply with the ICMP6 code 1362 * `unknown Qtype' in this case. However we regard the case 1363 * as an FQDN query for backward compatibility. 1364 * Older versions set a random value to this field, 1365 * so it rarely varies in the defined qtypes. 1366 * But the mechanism is not reliable... 1367 * maybe we should obsolete older versions. 1368 */ 1369 qtype = NI_QTYPE_FQDN; 1370 /* XXX will append an mbuf */ 1371 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1372 oldfqdn++; 1373 break; 1374 } 1375 1376 /* allocate an mbuf to reply. */ 1377 MGETHDR(n, M_DONTWAIT, m->m_type); 1378 if (n == NULL) { 1379 m_freem(m); 1380 return (NULL); 1381 } 1382 M_COPY_PKTHDR(n, m); /* just for rcvif */ 1383 if (replylen > MHLEN) { 1384 if (replylen > MCLBYTES) { 1385 /* 1386 * XXX: should we try to allocate more? But MCLBYTES 1387 * is probably much larger than IPV6_MMTU... 1388 */ 1389 goto bad; 1390 } 1391 MCLGET(n, M_DONTWAIT); 1392 if ((n->m_flags & M_EXT) == 0) { 1393 goto bad; 1394 } 1395 } 1396 n->m_pkthdr.len = n->m_len = replylen; 1397 1398 /* copy mbuf header and IPv6 + Node Information base headers */ 1399 bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr)); 1400 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1); 1401 bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo)); 1402 1403 /* qtype dependent procedure */ 1404 switch (qtype) { 1405 case NI_QTYPE_NOOP: 1406 nni6->ni_code = ICMP6_NI_SUCCESS; 1407 nni6->ni_flags = 0; 1408 break; 1409 case NI_QTYPE_SUPTYPES: 1410 { 1411 u_int32_t v; 1412 nni6->ni_code = ICMP6_NI_SUCCESS; 1413 nni6->ni_flags = htons(0x0000); /* raw bitmap */ 1414 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */ 1415 v = (u_int32_t)htonl(0x0000000f); 1416 bcopy(&v, nni6 + 1, sizeof(u_int32_t)); 1417 break; 1418 } 1419 case NI_QTYPE_FQDN: 1420 nni6->ni_code = ICMP6_NI_SUCCESS; 1421 fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) + 1422 sizeof(struct ip6_hdr) + 1423 sizeof(struct icmp6_nodeinfo)); 1424 nni6->ni_flags = 0; /* XXX: meaningless TTL */ 1425 fqdn->ni_fqdn_ttl = 0; /* ditto. */ 1426 /* 1427 * XXX do we really have FQDN in variable "hostname"? 1428 */ 1429 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn); 1430 if (n->m_next == NULL) 1431 goto bad; 1432 /* XXX we assume that n->m_next is not a chain */ 1433 if (n->m_next->m_next != NULL) 1434 goto bad; 1435 n->m_pkthdr.len += n->m_next->m_len; 1436 break; 1437 case NI_QTYPE_NODEADDR: 1438 { 1439 int lenlim, copied; 1440 1441 nni6->ni_code = ICMP6_NI_SUCCESS; 1442 n->m_pkthdr.len = n->m_len = 1443 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1444 lenlim = M_TRAILINGSPACE(n); 1445 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim); 1446 /* XXX: reset mbuf length */ 1447 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 1448 sizeof(struct icmp6_nodeinfo) + copied; 1449 break; 1450 } 1451 default: 1452 break; /* XXX impossible! */ 1453 } 1454 1455 nni6->ni_type = ICMP6_NI_REPLY; 1456 m_freem(m); 1457 return (n); 1458 1459 bad: 1460 m_freem(m); 1461 if (n) 1462 m_freem(n); 1463 return (NULL); 1464 } 1465 #undef hostnamelen 1466 1467 #define isupper(x) ('A' <= (x) && (x) <= 'Z') 1468 #define isalpha(x) (('A' <= (x) && (x) <= 'Z') || ('a' <= (x) && (x) <= 'z')) 1469 #define isalnum(x) (isalpha(x) || ('0' <= (x) && (x) <= '9')) 1470 #define tolower(x) (isupper(x) ? (x) + 'a' - 'A' : (x)) 1471 1472 /* 1473 * make a mbuf with DNS-encoded string. no compression support. 1474 * 1475 * XXX names with less than 2 dots (like "foo" or "foo.section") will be 1476 * treated as truncated name (two \0 at the end). this is a wild guess. 1477 */ 1478 static struct mbuf * 1479 ni6_nametodns(name, namelen, old) 1480 const char *name; 1481 int namelen; 1482 int old; /* return pascal string if non-zero */ 1483 { 1484 struct mbuf *m; 1485 char *cp, *ep; 1486 const char *p, *q; 1487 int i, len, nterm; 1488 1489 if (old) 1490 len = namelen + 1; 1491 else 1492 len = MCLBYTES; 1493 1494 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */ 1495 MGET(m, M_DONTWAIT, MT_DATA); 1496 if (m && len > MLEN) { 1497 MCLGET(m, M_DONTWAIT); 1498 if ((m->m_flags & M_EXT) == 0) 1499 goto fail; 1500 } 1501 if (!m) 1502 goto fail; 1503 m->m_next = NULL; 1504 1505 if (old) { 1506 m->m_len = len; 1507 *mtod(m, char *) = namelen; 1508 bcopy(name, mtod(m, char *) + 1, namelen); 1509 return m; 1510 } else { 1511 m->m_len = 0; 1512 cp = mtod(m, char *); 1513 ep = mtod(m, char *) + M_TRAILINGSPACE(m); 1514 1515 /* if not certain about my name, return empty buffer */ 1516 if (namelen == 0) 1517 return m; 1518 1519 /* 1520 * guess if it looks like shortened hostname, or FQDN. 1521 * shortened hostname needs two trailing "\0". 1522 */ 1523 i = 0; 1524 for (p = name; p < name + namelen; p++) { 1525 if (*p && *p == '.') 1526 i++; 1527 } 1528 if (i < 2) 1529 nterm = 2; 1530 else 1531 nterm = 1; 1532 1533 p = name; 1534 while (cp < ep && p < name + namelen) { 1535 i = 0; 1536 for (q = p; q < name + namelen && *q && *q != '.'; q++) 1537 i++; 1538 /* result does not fit into mbuf */ 1539 if (cp + i + 1 >= ep) 1540 goto fail; 1541 /* 1542 * DNS label length restriction, RFC1035 page 8. 1543 * "i == 0" case is included here to avoid returning 1544 * 0-length label on "foo..bar". 1545 */ 1546 if (i <= 0 || i >= 64) 1547 goto fail; 1548 *cp++ = i; 1549 if (!isalpha(p[0]) || !isalnum(p[i - 1])) 1550 goto fail; 1551 while (i > 0) { 1552 if (!isalnum(*p) && *p != '-') 1553 goto fail; 1554 if (isupper(*p)) { 1555 *cp++ = tolower(*p); 1556 p++; 1557 } else 1558 *cp++ = *p++; 1559 i--; 1560 } 1561 p = q; 1562 if (p < name + namelen && *p == '.') 1563 p++; 1564 } 1565 /* termination */ 1566 if (cp + nterm >= ep) 1567 goto fail; 1568 while (nterm-- > 0) 1569 *cp++ = '\0'; 1570 m->m_len = cp - mtod(m, char *); 1571 return m; 1572 } 1573 1574 panic("should not reach here"); 1575 /* NOTREACHED */ 1576 1577 fail: 1578 if (m) 1579 m_freem(m); 1580 return NULL; 1581 } 1582 1583 /* 1584 * check if two DNS-encoded string matches. takes care of truncated 1585 * form (with \0\0 at the end). no compression support. 1586 * XXX upper/lowercase match (see RFC2065) 1587 */ 1588 static int 1589 ni6_dnsmatch(a, alen, b, blen) 1590 const char *a; 1591 int alen; 1592 const char *b; 1593 int blen; 1594 { 1595 const char *a0, *b0; 1596 int l; 1597 1598 /* simplest case - need validation? */ 1599 if (alen == blen && bcmp(a, b, alen) == 0) 1600 return 1; 1601 1602 a0 = a; 1603 b0 = b; 1604 1605 /* termination is mandatory */ 1606 if (alen < 2 || blen < 2) 1607 return 0; 1608 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0') 1609 return 0; 1610 alen--; 1611 blen--; 1612 1613 while (a - a0 < alen && b - b0 < blen) { 1614 if (a - a0 + 1 > alen || b - b0 + 1 > blen) 1615 return 0; 1616 1617 if ((signed char)a[0] < 0 || (signed char)b[0] < 0) 1618 return 0; 1619 /* we don't support compression yet */ 1620 if (a[0] >= 64 || b[0] >= 64) 1621 return 0; 1622 1623 /* truncated case */ 1624 if (a[0] == 0 && a - a0 == alen - 1) 1625 return 1; 1626 if (b[0] == 0 && b - b0 == blen - 1) 1627 return 1; 1628 if (a[0] == 0 || b[0] == 0) 1629 return 0; 1630 1631 if (a[0] != b[0]) 1632 return 0; 1633 l = a[0]; 1634 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen) 1635 return 0; 1636 if (bcmp(a + 1, b + 1, l) != 0) 1637 return 0; 1638 1639 a += 1 + l; 1640 b += 1 + l; 1641 } 1642 1643 if (a - a0 == alen && b - b0 == blen) 1644 return 1; 1645 else 1646 return 0; 1647 } 1648 1649 /* 1650 * calculate the number of addresses to be returned in the node info reply. 1651 */ 1652 static int 1653 ni6_addrs(ni6, m, ifpp, subj) 1654 struct icmp6_nodeinfo *ni6; 1655 struct mbuf *m; 1656 struct ifnet **ifpp; 1657 char *subj; 1658 { 1659 struct ifnet *ifp; 1660 struct in6_ifaddr *ifa6; 1661 struct ifaddr *ifa; 1662 struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */ 1663 int addrs = 0, addrsofif, iffound = 0; 1664 int niflags = ni6->ni_flags; 1665 1666 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) { 1667 switch (ni6->ni_code) { 1668 case ICMP6_NI_SUBJ_IPV6: 1669 if (subj == NULL) /* must be impossible... */ 1670 return (0); 1671 subj_ip6 = (struct sockaddr_in6 *)subj; 1672 break; 1673 default: 1674 /* 1675 * XXX: we only support IPv6 subject address for 1676 * this Qtype. 1677 */ 1678 return (0); 1679 } 1680 } 1681 1682 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) 1683 { 1684 addrsofif = 0; 1685 for (ifa = ifp->if_addrlist.tqh_first; ifa; 1686 ifa = ifa->ifa_list.tqe_next) 1687 { 1688 if (ifa->ifa_addr->sa_family != AF_INET6) 1689 continue; 1690 ifa6 = (struct in6_ifaddr *)ifa; 1691 1692 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 && 1693 IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr, 1694 &ifa6->ia_addr.sin6_addr)) 1695 iffound = 1; 1696 1697 /* 1698 * IPv4-mapped addresses can only be returned by a 1699 * Node Information proxy, since they represent 1700 * addresses of IPv4-only nodes, which perforce do 1701 * not implement this protocol. 1702 * [icmp-name-lookups-07, Section 5.4] 1703 * So we don't support NI_NODEADDR_FLAG_COMPAT in 1704 * this function at this moment. 1705 */ 1706 1707 /* What do we have to do about ::1? */ 1708 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) { 1709 case IPV6_ADDR_SCOPE_LINKLOCAL: 1710 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1711 continue; 1712 break; 1713 case IPV6_ADDR_SCOPE_SITELOCAL: 1714 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1715 continue; 1716 break; 1717 case IPV6_ADDR_SCOPE_GLOBAL: 1718 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1719 continue; 1720 break; 1721 default: 1722 continue; 1723 } 1724 1725 /* 1726 * check if anycast is okay. 1727 * XXX: just experimental. not in the spec. 1728 */ 1729 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1730 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 1731 continue; /* we need only unicast addresses */ 1732 1733 addrsofif++; /* count the address */ 1734 } 1735 if (iffound) { 1736 *ifpp = ifp; 1737 return (addrsofif); 1738 } 1739 1740 addrs += addrsofif; 1741 } 1742 1743 return (addrs); 1744 } 1745 1746 static int 1747 ni6_store_addrs(ni6, nni6, ifp0, resid) 1748 struct icmp6_nodeinfo *ni6, *nni6; 1749 struct ifnet *ifp0; 1750 int resid; 1751 { 1752 struct ifnet *ifp = ifp0 ? ifp0 : TAILQ_FIRST(&ifnet); 1753 struct in6_ifaddr *ifa6; 1754 struct ifaddr *ifa; 1755 struct ifnet *ifp_dep = NULL; 1756 int copied = 0, allow_deprecated = 0; 1757 u_char *cp = (u_char *)(nni6 + 1); 1758 int niflags = ni6->ni_flags; 1759 u_int32_t ltime; 1760 1761 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL)) 1762 return (0); /* needless to copy */ 1763 1764 again: 1765 1766 for (; ifp; ifp = TAILQ_NEXT(ifp, if_list)) 1767 { 1768 for (ifa = ifp->if_addrlist.tqh_first; ifa; 1769 ifa = ifa->ifa_list.tqe_next) 1770 { 1771 if (ifa->ifa_addr->sa_family != AF_INET6) 1772 continue; 1773 ifa6 = (struct in6_ifaddr *)ifa; 1774 1775 if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) != 0 && 1776 allow_deprecated == 0) { 1777 /* 1778 * prefererred address should be put before 1779 * deprecated addresses. 1780 */ 1781 1782 /* record the interface for later search */ 1783 if (ifp_dep == NULL) 1784 ifp_dep = ifp; 1785 1786 continue; 1787 } 1788 else if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) == 0 && 1789 allow_deprecated != 0) 1790 continue; /* we now collect deprecated addrs */ 1791 1792 /* What do we have to do about ::1? */ 1793 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) { 1794 case IPV6_ADDR_SCOPE_LINKLOCAL: 1795 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1796 continue; 1797 break; 1798 case IPV6_ADDR_SCOPE_SITELOCAL: 1799 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1800 continue; 1801 break; 1802 case IPV6_ADDR_SCOPE_GLOBAL: 1803 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1804 continue; 1805 break; 1806 default: 1807 continue; 1808 } 1809 1810 /* 1811 * check if anycast is okay. 1812 * XXX: just experimental. not in the spec. 1813 */ 1814 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1815 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 1816 continue; 1817 1818 /* now we can copy the address */ 1819 if (resid < sizeof(struct in6_addr) + 1820 sizeof(u_int32_t)) { 1821 /* 1822 * We give up much more copy. 1823 * Set the truncate flag and return. 1824 */ 1825 nni6->ni_flags |= 1826 NI_NODEADDR_FLAG_TRUNCATE; 1827 return (copied); 1828 } 1829 1830 /* 1831 * Set the TTL of the address. 1832 * The TTL value should be one of the following 1833 * according to the specification: 1834 * 1835 * 1. The remaining lifetime of a DHCP lease on the 1836 * address, or 1837 * 2. The remaining Valid Lifetime of a prefix from 1838 * which the address was derived through Stateless 1839 * Autoconfiguration. 1840 * 1841 * Note that we currently do not support stateful 1842 * address configuration by DHCPv6, so the former 1843 * case can't happen. 1844 * 1845 * TTL must be 2^31 > TTL >= 0. 1846 */ 1847 if (ifa6->ia6_lifetime.ia6t_expire == 0) 1848 ltime = ND6_INFINITE_LIFETIME; 1849 else { 1850 if (ifa6->ia6_lifetime.ia6t_expire > 1851 time.tv_sec) 1852 ltime = ifa6->ia6_lifetime.ia6t_expire - time.tv_sec; 1853 else 1854 ltime = 0; 1855 } 1856 if (ltime > 0x7fffffff) 1857 ltime = 0x7fffffff; 1858 ltime = htonl(ltime); 1859 1860 bcopy(<ime, cp, sizeof(u_int32_t)); 1861 cp += sizeof(u_int32_t); 1862 1863 /* copy the address itself */ 1864 bcopy(&ifa6->ia_addr.sin6_addr, cp, 1865 sizeof(struct in6_addr)); 1866 /* XXX: KAME link-local hack; remove ifindex */ 1867 if (IN6_IS_ADDR_LINKLOCAL(&ifa6->ia_addr.sin6_addr)) 1868 ((struct in6_addr *)cp)->s6_addr16[1] = 0; 1869 cp += sizeof(struct in6_addr); 1870 1871 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1872 copied += (sizeof(struct in6_addr) + 1873 sizeof(u_int32_t)); 1874 } 1875 if (ifp0) /* we need search only on the specified IF */ 1876 break; 1877 } 1878 1879 if (allow_deprecated == 0 && ifp_dep != NULL) { 1880 ifp = ifp_dep; 1881 allow_deprecated = 1; 1882 1883 goto again; 1884 } 1885 1886 return (copied); 1887 } 1888 1889 /* 1890 * XXX almost dup'ed code with rip6_input. 1891 */ 1892 static int 1893 icmp6_rip6_input(mp, off) 1894 struct mbuf **mp; 1895 int off; 1896 { 1897 struct mbuf *m = *mp; 1898 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1899 struct inpcb_hdr *inph; 1900 struct in6pcb *in6p; 1901 struct in6pcb *last = NULL; 1902 struct sockaddr_in6 rip6src; 1903 struct icmp6_hdr *icmp6; 1904 struct mbuf *opts = NULL; 1905 1906 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 1907 if (icmp6 == NULL) { 1908 /* m is already reclaimed */ 1909 return IPPROTO_DONE; 1910 } 1911 1912 bzero(&rip6src, sizeof(rip6src)); 1913 rip6src.sin6_len = sizeof(struct sockaddr_in6); 1914 rip6src.sin6_family = AF_INET6; 1915 /* KAME hack: recover scopeid */ 1916 (void)in6_recoverscope(&rip6src, &ip6->ip6_src, m->m_pkthdr.rcvif); 1917 1918 CIRCLEQ_FOREACH(inph, &raw6cbtable.inpt_queue, inph_queue) { 1919 in6p = (struct in6pcb *)inph; 1920 if (in6p->in6p_af != AF_INET6) 1921 continue; 1922 if (in6p->in6p_ip6.ip6_nxt != IPPROTO_ICMPV6) 1923 continue; 1924 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && 1925 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst)) 1926 continue; 1927 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) && 1928 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src)) 1929 continue; 1930 if (in6p->in6p_icmp6filt 1931 && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type, 1932 in6p->in6p_icmp6filt)) 1933 continue; 1934 if (last) { 1935 struct mbuf *n; 1936 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { 1937 if (last->in6p_flags & IN6P_CONTROLOPTS) 1938 ip6_savecontrol(last, &opts, ip6, n); 1939 /* strip intermediate headers */ 1940 m_adj(n, off); 1941 if (sbappendaddr(&last->in6p_socket->so_rcv, 1942 (struct sockaddr *)&rip6src, 1943 n, opts) == 0) { 1944 /* should notify about lost packet */ 1945 m_freem(n); 1946 if (opts) 1947 m_freem(opts); 1948 } else 1949 sorwakeup(last->in6p_socket); 1950 opts = NULL; 1951 } 1952 } 1953 last = in6p; 1954 } 1955 if (last) { 1956 if (last->in6p_flags & IN6P_CONTROLOPTS) 1957 ip6_savecontrol(last, &opts, ip6, m); 1958 /* strip intermediate headers */ 1959 m_adj(m, off); 1960 if (sbappendaddr(&last->in6p_socket->so_rcv, 1961 (struct sockaddr *)&rip6src, m, opts) == 0) { 1962 m_freem(m); 1963 if (opts) 1964 m_freem(opts); 1965 } else 1966 sorwakeup(last->in6p_socket); 1967 } else { 1968 m_freem(m); 1969 ip6stat.ip6s_delivered--; 1970 } 1971 return IPPROTO_DONE; 1972 } 1973 1974 /* 1975 * Reflect the ip6 packet back to the source. 1976 * OFF points to the icmp6 header, counted from the top of the mbuf. 1977 * 1978 * Note: RFC 1885 required that an echo reply should be truncated if it 1979 * did not fit in with (return) path MTU, and KAME code supported the 1980 * behavior. However, as a clarification after the RFC, this limitation 1981 * was removed in a revised version of the spec, RFC 2463. We had kept the 1982 * old behavior, with a (non-default) ifdef block, while the new version of 1983 * the spec was an internet-draft status, and even after the new RFC was 1984 * published. But it would rather make sense to clean the obsoleted part 1985 * up, and to make the code simpler at this stage. 1986 */ 1987 void 1988 icmp6_reflect(m, off) 1989 struct mbuf *m; 1990 size_t off; 1991 { 1992 struct ip6_hdr *ip6; 1993 struct icmp6_hdr *icmp6; 1994 struct in6_ifaddr *ia; 1995 struct in6_addr t, *src = 0; 1996 int plen; 1997 int type, code; 1998 struct ifnet *outif = NULL; 1999 struct sockaddr_in6 sa6_src, sa6_dst; 2000 2001 /* too short to reflect */ 2002 if (off < sizeof(struct ip6_hdr)) { 2003 nd6log((LOG_DEBUG, 2004 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n", 2005 (u_long)off, (u_long)sizeof(struct ip6_hdr), 2006 __FILE__, __LINE__)); 2007 goto bad; 2008 } 2009 2010 /* 2011 * If there are extra headers between IPv6 and ICMPv6, strip 2012 * off that header first. 2013 */ 2014 #ifdef DIAGNOSTIC 2015 if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN) 2016 panic("assumption failed in icmp6_reflect"); 2017 #endif 2018 if (off > sizeof(struct ip6_hdr)) { 2019 size_t l; 2020 struct ip6_hdr nip6; 2021 2022 l = off - sizeof(struct ip6_hdr); 2023 m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6); 2024 m_adj(m, l); 2025 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2026 if (m->m_len < l) { 2027 if ((m = m_pullup(m, l)) == NULL) 2028 return; 2029 } 2030 bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6)); 2031 } else /* off == sizeof(struct ip6_hdr) */ { 2032 size_t l; 2033 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2034 if (m->m_len < l) { 2035 if ((m = m_pullup(m, l)) == NULL) 2036 return; 2037 } 2038 } 2039 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr); 2040 ip6 = mtod(m, struct ip6_hdr *); 2041 ip6->ip6_nxt = IPPROTO_ICMPV6; 2042 icmp6 = (struct icmp6_hdr *)(ip6 + 1); 2043 type = icmp6->icmp6_type; /* keep type for statistics */ 2044 code = icmp6->icmp6_code; /* ditto. */ 2045 2046 t = ip6->ip6_dst; 2047 /* 2048 * ip6_input() drops a packet if its src is multicast. 2049 * So, the src is never multicast. 2050 */ 2051 ip6->ip6_dst = ip6->ip6_src; 2052 2053 /* 2054 * XXX: make sure to embed scope zone information, using 2055 * already embedded IDs or the received interface (if any). 2056 * Note that rcvif may be NULL. 2057 * TODO: scoped routing case (XXX). 2058 */ 2059 bzero(&sa6_src, sizeof(sa6_src)); 2060 sa6_src.sin6_family = AF_INET6; 2061 sa6_src.sin6_len = sizeof(sa6_src); 2062 sa6_src.sin6_addr = ip6->ip6_dst; 2063 in6_recoverscope(&sa6_src, &ip6->ip6_dst, m->m_pkthdr.rcvif); 2064 in6_embedscope(&sa6_src.sin6_addr, &sa6_src, NULL, NULL); 2065 ip6->ip6_dst = sa6_src.sin6_addr; 2066 2067 bzero(&sa6_dst, sizeof(sa6_dst)); 2068 sa6_dst.sin6_family = AF_INET6; 2069 sa6_dst.sin6_len = sizeof(sa6_dst); 2070 sa6_dst.sin6_addr = t; 2071 in6_recoverscope(&sa6_dst, &t, m->m_pkthdr.rcvif); 2072 in6_embedscope(&t, &sa6_dst, NULL, NULL); 2073 2074 /* 2075 * If the incoming packet was addressed directly to us (i.e. unicast), 2076 * use dst as the src for the reply. 2077 * The IN6_IFF_NOTREADY case would be VERY rare, but is possible 2078 * (for example) when we encounter an error while forwarding procedure 2079 * destined to a duplicated address of ours. 2080 */ 2081 for (ia = in6_ifaddr; ia; ia = ia->ia_next) 2082 if (IN6_ARE_ADDR_EQUAL(&t, &ia->ia_addr.sin6_addr) && 2083 (ia->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) { 2084 src = &t; 2085 break; 2086 } 2087 if (ia == NULL && IN6_IS_ADDR_LINKLOCAL(&t) && (m->m_flags & M_LOOP)) { 2088 /* 2089 * This is the case if the dst is our link-local address 2090 * and the sender is also ourselves. 2091 */ 2092 src = &t; 2093 } 2094 2095 if (src == 0) { 2096 int e; 2097 struct route_in6 ro; 2098 2099 /* 2100 * This case matches to multicasts, our anycast, or unicasts 2101 * that we do not own. Select a source address based on the 2102 * source address of the erroneous packet. 2103 */ 2104 bzero(&ro, sizeof(ro)); 2105 src = in6_selectsrc(&sa6_src, NULL, NULL, &ro, NULL, &e); 2106 if (ro.ro_rt) { /* XXX: see comments in icmp6_mtudisc_update */ 2107 RTFREE(ro.ro_rt); /* XXX: we could use this */ 2108 } 2109 if (src == NULL) { 2110 nd6log((LOG_DEBUG, 2111 "icmp6_reflect: source can't be determined: " 2112 "dst=%s, error=%d\n", 2113 ip6_sprintf(&sa6_src.sin6_addr), e)); 2114 goto bad; 2115 } 2116 } 2117 2118 ip6->ip6_src = *src; 2119 2120 ip6->ip6_flow = 0; 2121 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2122 ip6->ip6_vfc |= IPV6_VERSION; 2123 ip6->ip6_nxt = IPPROTO_ICMPV6; 2124 if (m->m_pkthdr.rcvif) { 2125 /* XXX: This may not be the outgoing interface */ 2126 ip6->ip6_hlim = ND_IFINFO(m->m_pkthdr.rcvif)->chlim; 2127 } else 2128 ip6->ip6_hlim = ip6_defhlim; 2129 2130 icmp6->icmp6_cksum = 0; 2131 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6, 2132 sizeof(struct ip6_hdr), plen); 2133 2134 /* 2135 * XXX option handling 2136 */ 2137 2138 m->m_flags &= ~(M_BCAST|M_MCAST); 2139 2140 /* 2141 * To avoid a "too big" situation at an intermediate router 2142 * and the path MTU discovery process, specify the IPV6_MINMTU flag. 2143 * Note that only echo and node information replies are affected, 2144 * since the length of ICMP6 errors is limited to the minimum MTU. 2145 */ 2146 if (ip6_output(m, NULL, NULL, IPV6_MINMTU, 2147 (struct ip6_moptions *)NULL, (struct socket *)NULL, &outif) != 0 2148 && outif) 2149 icmp6_ifstat_inc(outif, ifs6_out_error); 2150 2151 if (outif) 2152 icmp6_ifoutstat_inc(outif, type, code); 2153 2154 return; 2155 2156 bad: 2157 m_freem(m); 2158 return; 2159 } 2160 2161 void 2162 icmp6_fasttimo() 2163 { 2164 2165 mld6_fasttimeo(); 2166 } 2167 2168 static const char * 2169 icmp6_redirect_diag(src6, dst6, tgt6) 2170 struct in6_addr *src6; 2171 struct in6_addr *dst6; 2172 struct in6_addr *tgt6; 2173 { 2174 static char buf[1024]; 2175 snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)", 2176 ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6)); 2177 return buf; 2178 } 2179 2180 void 2181 icmp6_redirect_input(m, off) 2182 struct mbuf *m; 2183 int off; 2184 { 2185 struct ifnet *ifp = m->m_pkthdr.rcvif; 2186 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 2187 struct nd_redirect *nd_rd; 2188 int icmp6len = ntohs(ip6->ip6_plen); 2189 char *lladdr = NULL; 2190 int lladdrlen = 0; 2191 struct rtentry *rt = NULL; 2192 int is_router; 2193 int is_onlink; 2194 struct in6_addr src6 = ip6->ip6_src; 2195 struct in6_addr redtgt6; 2196 struct in6_addr reddst6; 2197 union nd_opts ndopts; 2198 2199 if (!ifp) 2200 return; 2201 2202 /* XXX if we are router, we don't update route by icmp6 redirect */ 2203 if (ip6_forwarding) 2204 goto freeit; 2205 if (!icmp6_rediraccept) 2206 goto freeit; 2207 2208 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len); 2209 if (nd_rd == NULL) { 2210 icmp6stat.icp6s_tooshort++; 2211 return; 2212 } 2213 redtgt6 = nd_rd->nd_rd_target; 2214 reddst6 = nd_rd->nd_rd_dst; 2215 2216 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 2217 redtgt6.s6_addr16[1] = htons(ifp->if_index); 2218 if (IN6_IS_ADDR_LINKLOCAL(&reddst6)) 2219 reddst6.s6_addr16[1] = htons(ifp->if_index); 2220 2221 /* validation */ 2222 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) { 2223 nd6log((LOG_ERR, 2224 "ICMP6 redirect sent from %s rejected; " 2225 "must be from linklocal\n", ip6_sprintf(&src6))); 2226 goto bad; 2227 } 2228 if (ip6->ip6_hlim != 255) { 2229 nd6log((LOG_ERR, 2230 "ICMP6 redirect sent from %s rejected; " 2231 "hlim=%d (must be 255)\n", 2232 ip6_sprintf(&src6), ip6->ip6_hlim)); 2233 goto bad; 2234 } 2235 { 2236 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */ 2237 struct sockaddr_in6 sin6; 2238 struct in6_addr *gw6; 2239 2240 bzero(&sin6, sizeof(sin6)); 2241 sin6.sin6_family = AF_INET6; 2242 sin6.sin6_len = sizeof(struct sockaddr_in6); 2243 bcopy(&reddst6, &sin6.sin6_addr, sizeof(reddst6)); 2244 rt = rtalloc1((struct sockaddr *)&sin6, 0); 2245 if (rt) { 2246 if (rt->rt_gateway == NULL || 2247 rt->rt_gateway->sa_family != AF_INET6) { 2248 nd6log((LOG_ERR, 2249 "ICMP6 redirect rejected; no route " 2250 "with inet6 gateway found for redirect dst: %s\n", 2251 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2252 RTFREE(rt); 2253 goto bad; 2254 } 2255 2256 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr); 2257 if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) { 2258 nd6log((LOG_ERR, 2259 "ICMP6 redirect rejected; " 2260 "not equal to gw-for-src=%s (must be same): " 2261 "%s\n", 2262 ip6_sprintf(gw6), 2263 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2264 RTFREE(rt); 2265 goto bad; 2266 } 2267 } else { 2268 nd6log((LOG_ERR, 2269 "ICMP6 redirect rejected; " 2270 "no route found for redirect dst: %s\n", 2271 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2272 goto bad; 2273 } 2274 RTFREE(rt); 2275 rt = NULL; 2276 } 2277 if (IN6_IS_ADDR_MULTICAST(&reddst6)) { 2278 nd6log((LOG_ERR, 2279 "ICMP6 redirect rejected; " 2280 "redirect dst must be unicast: %s\n", 2281 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2282 goto bad; 2283 } 2284 2285 is_router = is_onlink = 0; 2286 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 2287 is_router = 1; /* router case */ 2288 if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0) 2289 is_onlink = 1; /* on-link destination case */ 2290 if (!is_router && !is_onlink) { 2291 nd6log((LOG_ERR, 2292 "ICMP6 redirect rejected; " 2293 "neither router case nor onlink case: %s\n", 2294 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2295 goto bad; 2296 } 2297 /* validation passed */ 2298 2299 icmp6len -= sizeof(*nd_rd); 2300 nd6_option_init(nd_rd + 1, icmp6len, &ndopts); 2301 if (nd6_options(&ndopts) < 0) { 2302 nd6log((LOG_INFO, "icmp6_redirect_input: " 2303 "invalid ND option, rejected: %s\n", 2304 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2305 /* nd6_options have incremented stats */ 2306 goto freeit; 2307 } 2308 2309 if (ndopts.nd_opts_tgt_lladdr) { 2310 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 2311 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 2312 } 2313 2314 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 2315 nd6log((LOG_INFO, 2316 "icmp6_redirect_input: lladdrlen mismatch for %s " 2317 "(if %d, icmp6 packet %d): %s\n", 2318 ip6_sprintf(&redtgt6), ifp->if_addrlen, lladdrlen - 2, 2319 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2320 goto bad; 2321 } 2322 2323 /* RFC 2461 8.3 */ 2324 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT, 2325 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER); 2326 2327 if (!is_onlink) { /* better router case. perform rtredirect. */ 2328 /* perform rtredirect */ 2329 struct sockaddr_in6 sdst; 2330 struct sockaddr_in6 sgw; 2331 struct sockaddr_in6 ssrc; 2332 unsigned long rtcount; 2333 struct rtentry *newrt = NULL; 2334 2335 /* 2336 * do not install redirect route, if the number of entries 2337 * is too much (> hiwat). note that, the node (= host) will 2338 * work just fine even if we do not install redirect route 2339 * (there will be additional hops, though). 2340 */ 2341 rtcount = rt_timer_count(icmp6_redirect_timeout_q); 2342 if (0 <= icmp6_redirect_hiwat && rtcount > icmp6_redirect_hiwat) 2343 return; 2344 else if (0 <= icmp6_redirect_lowat && 2345 rtcount > icmp6_redirect_lowat) { 2346 /* 2347 * XXX nuke a victim, install the new one. 2348 */ 2349 } 2350 2351 bzero(&sdst, sizeof(sdst)); 2352 bzero(&sgw, sizeof(sgw)); 2353 bzero(&ssrc, sizeof(ssrc)); 2354 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6; 2355 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len = 2356 sizeof(struct sockaddr_in6); 2357 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr)); 2358 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2359 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr)); 2360 rtredirect((struct sockaddr *)&sdst, (struct sockaddr *)&sgw, 2361 (struct sockaddr *)NULL, RTF_GATEWAY | RTF_HOST, 2362 (struct sockaddr *)&ssrc, 2363 &newrt); 2364 2365 if (newrt) { 2366 (void)rt_timer_add(newrt, icmp6_redirect_timeout, 2367 icmp6_redirect_timeout_q); 2368 rtfree(newrt); 2369 } 2370 } 2371 /* finally update cached route in each socket via pfctlinput */ 2372 { 2373 struct sockaddr_in6 sdst; 2374 2375 bzero(&sdst, sizeof(sdst)); 2376 sdst.sin6_family = AF_INET6; 2377 sdst.sin6_len = sizeof(struct sockaddr_in6); 2378 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2379 pfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst); 2380 #ifdef IPSEC 2381 key_sa_routechange((struct sockaddr *)&sdst); 2382 #endif 2383 } 2384 2385 freeit: 2386 m_freem(m); 2387 return; 2388 2389 bad: 2390 icmp6stat.icp6s_badredirect++; 2391 m_freem(m); 2392 } 2393 2394 void 2395 icmp6_redirect_output(m0, rt) 2396 struct mbuf *m0; 2397 struct rtentry *rt; 2398 { 2399 struct ifnet *ifp; /* my outgoing interface */ 2400 struct in6_addr *ifp_ll6; 2401 struct in6_addr *nexthop; 2402 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */ 2403 struct mbuf *m = NULL; /* newly allocated one */ 2404 struct ip6_hdr *ip6; /* m as struct ip6_hdr */ 2405 struct nd_redirect *nd_rd; 2406 size_t maxlen; 2407 u_char *p; 2408 struct sockaddr_in6 src_sa; 2409 2410 icmp6_errcount(&icmp6stat.icp6s_outerrhist, ND_REDIRECT, 0); 2411 2412 /* if we are not router, we don't send icmp6 redirect */ 2413 if (!ip6_forwarding) 2414 goto fail; 2415 2416 /* sanity check */ 2417 if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp)) 2418 goto fail; 2419 2420 /* 2421 * Address check: 2422 * the source address must identify a neighbor, and 2423 * the destination address must not be a multicast address 2424 * [RFC 2461, sec 8.2] 2425 */ 2426 sip6 = mtod(m0, struct ip6_hdr *); 2427 bzero(&src_sa, sizeof(src_sa)); 2428 src_sa.sin6_family = AF_INET6; 2429 src_sa.sin6_len = sizeof(src_sa); 2430 src_sa.sin6_addr = sip6->ip6_src; 2431 /* we don't currently use sin6_scope_id, but eventually use it */ 2432 src_sa.sin6_scope_id = in6_addr2scopeid(ifp, &sip6->ip6_src); 2433 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0) 2434 goto fail; 2435 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst)) 2436 goto fail; /* what should we do here? */ 2437 2438 /* rate limit */ 2439 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0)) 2440 goto fail; 2441 2442 /* 2443 * Since we are going to append up to 1280 bytes (= IPV6_MMTU), 2444 * we almost always ask for an mbuf cluster for simplicity. 2445 * (MHLEN < IPV6_MMTU is almost always true) 2446 */ 2447 #if IPV6_MMTU >= MCLBYTES 2448 # error assumption failed about IPV6_MMTU and MCLBYTES 2449 #endif 2450 MGETHDR(m, M_DONTWAIT, MT_HEADER); 2451 if (m && IPV6_MMTU >= MHLEN) 2452 MCLGET(m, M_DONTWAIT); 2453 if (!m) 2454 goto fail; 2455 m->m_pkthdr.rcvif = NULL; 2456 m->m_len = 0; 2457 maxlen = M_TRAILINGSPACE(m); 2458 maxlen = min(IPV6_MMTU, maxlen); 2459 /* just for safety */ 2460 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) + 2461 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) { 2462 goto fail; 2463 } 2464 2465 { 2466 /* get ip6 linklocal address for ifp(my outgoing interface). */ 2467 struct in6_ifaddr *ia; 2468 if ((ia = in6ifa_ifpforlinklocal(ifp, 2469 IN6_IFF_NOTREADY| 2470 IN6_IFF_ANYCAST)) == NULL) 2471 goto fail; 2472 ifp_ll6 = &ia->ia_addr.sin6_addr; 2473 } 2474 2475 /* get ip6 linklocal address for the router. */ 2476 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) { 2477 struct sockaddr_in6 *sin6; 2478 sin6 = (struct sockaddr_in6 *)rt->rt_gateway; 2479 nexthop = &sin6->sin6_addr; 2480 if (!IN6_IS_ADDR_LINKLOCAL(nexthop)) 2481 nexthop = NULL; 2482 } else 2483 nexthop = NULL; 2484 2485 /* ip6 */ 2486 ip6 = mtod(m, struct ip6_hdr *); 2487 ip6->ip6_flow = 0; 2488 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2489 ip6->ip6_vfc |= IPV6_VERSION; 2490 /* ip6->ip6_plen will be set later */ 2491 ip6->ip6_nxt = IPPROTO_ICMPV6; 2492 ip6->ip6_hlim = 255; 2493 /* ip6->ip6_src must be linklocal addr for my outgoing if. */ 2494 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr)); 2495 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr)); 2496 2497 /* ND Redirect */ 2498 nd_rd = (struct nd_redirect *)(ip6 + 1); 2499 nd_rd->nd_rd_type = ND_REDIRECT; 2500 nd_rd->nd_rd_code = 0; 2501 nd_rd->nd_rd_reserved = 0; 2502 if (rt->rt_flags & RTF_GATEWAY) { 2503 /* 2504 * nd_rd->nd_rd_target must be a link-local address in 2505 * better router cases. 2506 */ 2507 if (!nexthop) 2508 goto fail; 2509 bcopy(nexthop, &nd_rd->nd_rd_target, 2510 sizeof(nd_rd->nd_rd_target)); 2511 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2512 sizeof(nd_rd->nd_rd_dst)); 2513 } else { 2514 /* make sure redtgt == reddst */ 2515 nexthop = &sip6->ip6_dst; 2516 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target, 2517 sizeof(nd_rd->nd_rd_target)); 2518 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2519 sizeof(nd_rd->nd_rd_dst)); 2520 } 2521 2522 p = (u_char *)(nd_rd + 1); 2523 2524 { 2525 /* target lladdr option */ 2526 struct rtentry *rt_nexthop = NULL; 2527 int len; 2528 struct sockaddr_dl *sdl; 2529 struct nd_opt_hdr *nd_opt; 2530 char *lladdr; 2531 2532 rt_nexthop = nd6_lookup(nexthop, 0, ifp); 2533 if (!rt_nexthop) 2534 goto nolladdropt; 2535 len = sizeof(*nd_opt) + ifp->if_addrlen; 2536 len = (len + 7) & ~7; /* round by 8 */ 2537 /* safety check */ 2538 if (len + (p - (u_char *)ip6) > maxlen) 2539 goto nolladdropt; 2540 if (!(rt_nexthop->rt_flags & RTF_GATEWAY) && 2541 (rt_nexthop->rt_flags & RTF_LLINFO) && 2542 (rt_nexthop->rt_gateway->sa_family == AF_LINK) && 2543 (sdl = (struct sockaddr_dl *)rt_nexthop->rt_gateway) && 2544 sdl->sdl_alen) { 2545 nd_opt = (struct nd_opt_hdr *)p; 2546 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 2547 nd_opt->nd_opt_len = len >> 3; 2548 lladdr = (char *)(nd_opt + 1); 2549 bcopy(LLADDR(sdl), lladdr, ifp->if_addrlen); 2550 p += len; 2551 } 2552 } 2553 nolladdropt:; 2554 2555 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2556 2557 /* just to be safe */ 2558 if (m0->m_flags & M_DECRYPTED) 2559 goto noredhdropt; 2560 if (p - (u_char *)ip6 > maxlen) 2561 goto noredhdropt; 2562 2563 { 2564 /* redirected header option */ 2565 int len; 2566 struct nd_opt_rd_hdr *nd_opt_rh; 2567 2568 /* 2569 * compute the maximum size for icmp6 redirect header option. 2570 * XXX room for auth header? 2571 */ 2572 len = maxlen - (p - (u_char *)ip6); 2573 len &= ~7; 2574 2575 /* 2576 * Redirected header option spec (RFC2461 4.6.3) talks nothing 2577 * about padding/truncate rule for the original IP packet. 2578 * From the discussion on IPv6imp in Feb 1999, 2579 * the consensus was: 2580 * - "attach as much as possible" is the goal 2581 * - pad if not aligned (original size can be guessed by 2582 * original ip6 header) 2583 * Following code adds the padding if it is simple enough, 2584 * and truncates if not. 2585 */ 2586 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) { 2587 /* not enough room, truncate */ 2588 m_adj(m0, (len - sizeof(*nd_opt_rh)) - 2589 m0->m_pkthdr.len); 2590 } else { 2591 /* 2592 * enough room, truncate if not aligned. 2593 * we don't pad here for simplicity. 2594 */ 2595 size_t extra; 2596 2597 extra = m0->m_pkthdr.len % 8; 2598 if (extra) { 2599 /* truncate */ 2600 m_adj(m0, -extra); 2601 } 2602 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh); 2603 } 2604 2605 nd_opt_rh = (struct nd_opt_rd_hdr *)p; 2606 bzero(nd_opt_rh, sizeof(*nd_opt_rh)); 2607 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER; 2608 nd_opt_rh->nd_opt_rh_len = len >> 3; 2609 p += sizeof(*nd_opt_rh); 2610 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2611 2612 /* connect m0 to m */ 2613 m->m_pkthdr.len += m0->m_pkthdr.len; 2614 m_cat(m, m0); 2615 m0 = NULL; 2616 } 2617 noredhdropt: 2618 if (m0) { 2619 m_freem(m0); 2620 m0 = NULL; 2621 } 2622 2623 if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_src)) 2624 sip6->ip6_src.s6_addr16[1] = 0; 2625 if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_dst)) 2626 sip6->ip6_dst.s6_addr16[1] = 0; 2627 #if 0 2628 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src)) 2629 ip6->ip6_src.s6_addr16[1] = 0; 2630 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) 2631 ip6->ip6_dst.s6_addr16[1] = 0; 2632 #endif 2633 if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_target)) 2634 nd_rd->nd_rd_target.s6_addr16[1] = 0; 2635 if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_dst)) 2636 nd_rd->nd_rd_dst.s6_addr16[1] = 0; 2637 2638 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 2639 2640 nd_rd->nd_rd_cksum = 0; 2641 nd_rd->nd_rd_cksum 2642 = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen)); 2643 2644 /* send the packet to outside... */ 2645 if (ip6_output(m, NULL, NULL, 0, 2646 (struct ip6_moptions *)NULL, (struct socket *)NULL, NULL) != 0) 2647 icmp6_ifstat_inc(ifp, ifs6_out_error); 2648 2649 icmp6_ifstat_inc(ifp, ifs6_out_msg); 2650 icmp6_ifstat_inc(ifp, ifs6_out_redirect); 2651 icmp6stat.icp6s_outhist[ND_REDIRECT]++; 2652 2653 return; 2654 2655 fail: 2656 if (m) 2657 m_freem(m); 2658 if (m0) 2659 m_freem(m0); 2660 } 2661 2662 /* 2663 * ICMPv6 socket option processing. 2664 */ 2665 int 2666 icmp6_ctloutput(op, so, level, optname, mp) 2667 int op; 2668 struct socket *so; 2669 int level, optname; 2670 struct mbuf **mp; 2671 { 2672 int error = 0; 2673 int optlen; 2674 struct in6pcb *in6p = sotoin6pcb(so); 2675 struct mbuf *m = *mp; 2676 2677 optlen = m ? m->m_len : 0; 2678 2679 if (level != IPPROTO_ICMPV6) { 2680 if (op == PRCO_SETOPT && m) 2681 (void)m_free(m); 2682 return EINVAL; 2683 } 2684 2685 switch (op) { 2686 case PRCO_SETOPT: 2687 switch (optname) { 2688 case ICMP6_FILTER: 2689 { 2690 struct icmp6_filter *p; 2691 2692 if (optlen != sizeof(*p)) { 2693 error = EMSGSIZE; 2694 break; 2695 } 2696 p = mtod(m, struct icmp6_filter *); 2697 if (!p || !in6p->in6p_icmp6filt) { 2698 error = EINVAL; 2699 break; 2700 } 2701 bcopy(p, in6p->in6p_icmp6filt, 2702 sizeof(struct icmp6_filter)); 2703 error = 0; 2704 break; 2705 } 2706 2707 default: 2708 error = ENOPROTOOPT; 2709 break; 2710 } 2711 if (m) 2712 (void)m_freem(m); 2713 break; 2714 2715 case PRCO_GETOPT: 2716 switch (optname) { 2717 case ICMP6_FILTER: 2718 { 2719 struct icmp6_filter *p; 2720 2721 if (!in6p->in6p_icmp6filt) { 2722 error = EINVAL; 2723 break; 2724 } 2725 *mp = m = m_get(M_WAIT, MT_SOOPTS); 2726 m->m_len = sizeof(struct icmp6_filter); 2727 p = mtod(m, struct icmp6_filter *); 2728 bcopy(in6p->in6p_icmp6filt, p, 2729 sizeof(struct icmp6_filter)); 2730 error = 0; 2731 break; 2732 } 2733 2734 default: 2735 error = ENOPROTOOPT; 2736 break; 2737 } 2738 break; 2739 } 2740 2741 return (error); 2742 } 2743 2744 /* 2745 * Perform rate limit check. 2746 * Returns 0 if it is okay to send the icmp6 packet. 2747 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate 2748 * limitation. 2749 * 2750 * XXX per-destination/type check necessary? 2751 */ 2752 static int 2753 icmp6_ratelimit(dst, type, code) 2754 const struct in6_addr *dst; /* not used at this moment */ 2755 const int type; /* not used at this moment */ 2756 const int code; /* not used at this moment */ 2757 { 2758 int ret; 2759 2760 ret = 0; /* okay to send */ 2761 2762 /* PPS limit */ 2763 if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count, 2764 icmp6errppslim)) { 2765 /* The packet is subject to rate limit */ 2766 ret++; 2767 } 2768 2769 return ret; 2770 } 2771 2772 static struct rtentry * 2773 icmp6_mtudisc_clone(dst) 2774 struct sockaddr *dst; 2775 { 2776 struct rtentry *rt; 2777 int error; 2778 2779 rt = rtalloc1(dst, 1); 2780 if (rt == 0) 2781 return NULL; 2782 2783 /* If we didn't get a host route, allocate one */ 2784 if ((rt->rt_flags & RTF_HOST) == 0) { 2785 struct rtentry *nrt; 2786 2787 error = rtrequest((int) RTM_ADD, dst, 2788 (struct sockaddr *) rt->rt_gateway, 2789 (struct sockaddr *) 0, 2790 RTF_GATEWAY | RTF_HOST | RTF_DYNAMIC, &nrt); 2791 if (error) { 2792 rtfree(rt); 2793 return NULL; 2794 } 2795 nrt->rt_rmx = rt->rt_rmx; 2796 rtfree(rt); 2797 rt = nrt; 2798 } 2799 error = rt_timer_add(rt, icmp6_mtudisc_timeout, 2800 icmp6_mtudisc_timeout_q); 2801 if (error) { 2802 rtfree(rt); 2803 return NULL; 2804 } 2805 2806 return rt; /* caller need to call rtfree() */ 2807 } 2808 2809 static void 2810 icmp6_mtudisc_timeout(rt, r) 2811 struct rtentry *rt; 2812 struct rttimer *r; 2813 { 2814 if (rt == NULL) 2815 panic("icmp6_mtudisc_timeout: bad route to timeout"); 2816 if ((rt->rt_flags & (RTF_DYNAMIC | RTF_HOST)) == 2817 (RTF_DYNAMIC | RTF_HOST)) { 2818 rtrequest((int) RTM_DELETE, (struct sockaddr *)rt_key(rt), 2819 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0); 2820 } else { 2821 if (!(rt->rt_rmx.rmx_locks & RTV_MTU)) 2822 rt->rt_rmx.rmx_mtu = 0; 2823 } 2824 } 2825 2826 static void 2827 icmp6_redirect_timeout(rt, r) 2828 struct rtentry *rt; 2829 struct rttimer *r; 2830 { 2831 if (rt == NULL) 2832 panic("icmp6_redirect_timeout: bad route to timeout"); 2833 if ((rt->rt_flags & (RTF_GATEWAY | RTF_DYNAMIC | RTF_HOST)) == 2834 (RTF_GATEWAY | RTF_DYNAMIC | RTF_HOST)) { 2835 rtrequest((int) RTM_DELETE, (struct sockaddr *)rt_key(rt), 2836 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0); 2837 } 2838 } 2839 2840 /* 2841 * sysctl helper routine for the net.inet6.icmp6.nd6 nodes. silly? 2842 */ 2843 static int 2844 sysctl_net_inet6_icmp6_nd6(SYSCTLFN_ARGS) 2845 { 2846 2847 if (namelen != 0) 2848 return (EINVAL); 2849 2850 return (nd6_sysctl(rnode->sysctl_num, oldp, oldlenp, 2851 (void*)newp, newlen)); 2852 } 2853 2854 SYSCTL_SETUP(sysctl_net_inet6_icmp6_setup, 2855 "sysctl net.inet6.icmp6 subtree setup") 2856 { 2857 2858 sysctl_createv(clog, 0, NULL, NULL, 2859 CTLFLAG_PERMANENT, 2860 CTLTYPE_NODE, "net", NULL, 2861 NULL, 0, NULL, 0, 2862 CTL_NET, CTL_EOL); 2863 sysctl_createv(clog, 0, NULL, NULL, 2864 CTLFLAG_PERMANENT, 2865 CTLTYPE_NODE, "inet6", NULL, 2866 NULL, 0, NULL, 0, 2867 CTL_NET, PF_INET6, CTL_EOL); 2868 sysctl_createv(clog, 0, NULL, NULL, 2869 CTLFLAG_PERMANENT, 2870 CTLTYPE_NODE, "icmp6", 2871 SYSCTL_DESCR("ICMPv6 related settings"), 2872 NULL, 0, NULL, 0, 2873 CTL_NET, PF_INET6, IPPROTO_ICMPV6, CTL_EOL); 2874 2875 sysctl_createv(clog, 0, NULL, NULL, 2876 CTLFLAG_PERMANENT, 2877 CTLTYPE_STRUCT, "stats", 2878 SYSCTL_DESCR("ICMPv6 transmission statistics"), 2879 NULL, 0, &icmp6stat, sizeof(icmp6stat), 2880 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2881 ICMPV6CTL_STATS, CTL_EOL); 2882 sysctl_createv(clog, 0, NULL, NULL, 2883 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2884 CTLTYPE_INT, "rediraccept", 2885 SYSCTL_DESCR("Accept and process redirect messages"), 2886 NULL, 0, &icmp6_rediraccept, 0, 2887 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2888 ICMPV6CTL_REDIRACCEPT, CTL_EOL); 2889 sysctl_createv(clog, 0, NULL, NULL, 2890 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2891 CTLTYPE_INT, "redirtimeout", 2892 SYSCTL_DESCR("Redirect generated route lifetime"), 2893 NULL, 0, &icmp6_redirtimeout, 0, 2894 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2895 ICMPV6CTL_REDIRTIMEOUT, CTL_EOL); 2896 #if 0 /* obsoleted */ 2897 sysctl_createv(clog, 0, NULL, NULL, 2898 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2899 CTLTYPE_INT, "errratelimit", NULL, 2900 NULL, 0, &icmp6_errratelimit, 0, 2901 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2902 ICMPV6CTL_ERRRATELIMIT, CTL_EOL); 2903 #endif 2904 sysctl_createv(clog, 0, NULL, NULL, 2905 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2906 CTLTYPE_INT, "nd6_prune", 2907 SYSCTL_DESCR("Neighbor discovery prune interval"), 2908 NULL, 0, &nd6_prune, 0, 2909 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2910 ICMPV6CTL_ND6_PRUNE, CTL_EOL); 2911 sysctl_createv(clog, 0, NULL, NULL, 2912 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2913 CTLTYPE_INT, "nd6_delay", 2914 SYSCTL_DESCR("First probe delay time"), 2915 NULL, 0, &nd6_delay, 0, 2916 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2917 ICMPV6CTL_ND6_DELAY, CTL_EOL); 2918 sysctl_createv(clog, 0, NULL, NULL, 2919 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2920 CTLTYPE_INT, "nd6_umaxtries", 2921 SYSCTL_DESCR("Number of unicast discovery attempts"), 2922 NULL, 0, &nd6_umaxtries, 0, 2923 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2924 ICMPV6CTL_ND6_UMAXTRIES, CTL_EOL); 2925 sysctl_createv(clog, 0, NULL, NULL, 2926 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2927 CTLTYPE_INT, "nd6_mmaxtries", 2928 SYSCTL_DESCR("Number of multicast discovery attempts"), 2929 NULL, 0, &nd6_mmaxtries, 0, 2930 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2931 ICMPV6CTL_ND6_MMAXTRIES, CTL_EOL); 2932 sysctl_createv(clog, 0, NULL, NULL, 2933 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2934 CTLTYPE_INT, "nd6_useloopback", 2935 SYSCTL_DESCR("Use loopback interface for local traffic"), 2936 NULL, 0, &nd6_useloopback, 0, 2937 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2938 ICMPV6CTL_ND6_USELOOPBACK, CTL_EOL); 2939 #if 0 /* obsoleted */ 2940 sysctl_createv(clog, 0, NULL, NULL, 2941 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2942 CTLTYPE_INT, "nd6_proxyall", NULL, 2943 NULL, 0, &nd6_proxyall, 0, 2944 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2945 ICMPV6CTL_ND6_PROXYALL, CTL_EOL); 2946 #endif 2947 sysctl_createv(clog, 0, NULL, NULL, 2948 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2949 CTLTYPE_INT, "nodeinfo", 2950 SYSCTL_DESCR("Respond to node information requests"), 2951 NULL, 0, &icmp6_nodeinfo, 0, 2952 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2953 ICMPV6CTL_NODEINFO, CTL_EOL); 2954 sysctl_createv(clog, 0, NULL, NULL, 2955 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2956 CTLTYPE_INT, "errppslimit", 2957 SYSCTL_DESCR("Maximum ICMP errors sent per second"), 2958 NULL, 0, &icmp6errppslim, 0, 2959 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2960 ICMPV6CTL_ERRPPSLIMIT, CTL_EOL); 2961 sysctl_createv(clog, 0, NULL, NULL, 2962 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2963 CTLTYPE_INT, "nd6_maxnudhint", 2964 SYSCTL_DESCR("Maximum neighbor unreachable hint count"), 2965 NULL, 0, &nd6_maxnudhint, 0, 2966 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2967 ICMPV6CTL_ND6_MAXNUDHINT, CTL_EOL); 2968 sysctl_createv(clog, 0, NULL, NULL, 2969 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2970 CTLTYPE_INT, "mtudisc_hiwat", 2971 SYSCTL_DESCR("Low mark on MTU Discovery route timers"), 2972 NULL, 0, &icmp6_mtudisc_hiwat, 0, 2973 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2974 ICMPV6CTL_MTUDISC_HIWAT, CTL_EOL); 2975 sysctl_createv(clog, 0, NULL, NULL, 2976 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2977 CTLTYPE_INT, "mtudisc_lowat", 2978 SYSCTL_DESCR("Low mark on MTU Discovery route timers"), 2979 NULL, 0, &icmp6_mtudisc_lowat, 0, 2980 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2981 ICMPV6CTL_MTUDISC_LOWAT, CTL_EOL); 2982 sysctl_createv(clog, 0, NULL, NULL, 2983 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2984 CTLTYPE_INT, "nd6_debug", 2985 SYSCTL_DESCR("Enable neighbor discovery debug output"), 2986 NULL, 0, &nd6_debug, 0, 2987 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2988 ICMPV6CTL_ND6_DEBUG, CTL_EOL); 2989 sysctl_createv(clog, 0, NULL, NULL, 2990 CTLFLAG_PERMANENT, 2991 CTLTYPE_STRUCT, "nd6_drlist", 2992 SYSCTL_DESCR("Default router list"), 2993 sysctl_net_inet6_icmp6_nd6, 0, NULL, 0, 2994 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2995 ICMPV6CTL_ND6_DRLIST, CTL_EOL); 2996 sysctl_createv(clog, 0, NULL, NULL, 2997 CTLFLAG_PERMANENT, 2998 CTLTYPE_STRUCT, "nd6_prlist", 2999 SYSCTL_DESCR("Prefix list"), 3000 sysctl_net_inet6_icmp6_nd6, 0, NULL, 0, 3001 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3002 ICMPV6CTL_ND6_PRLIST, CTL_EOL); 3003 } 3004