1 /* $NetBSD: icmp6.c,v 1.109 2005/05/29 21:43:51 christos 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 1.109 2005/05/29 21:43:51 christos 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); 517 518 code = PRC_MSGSIZE; 519 520 /* 521 * Updating the path MTU will be done after examining 522 * intermediate extension headers. 523 */ 524 goto deliver; 525 526 case ICMP6_TIME_EXCEEDED: 527 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_timeexceed); 528 switch (code) { 529 case ICMP6_TIME_EXCEED_TRANSIT: 530 code = PRC_TIMXCEED_INTRANS; 531 break; 532 case ICMP6_TIME_EXCEED_REASSEMBLY: 533 code = PRC_TIMXCEED_REASS; 534 break; 535 default: 536 goto badcode; 537 } 538 goto deliver; 539 540 case ICMP6_PARAM_PROB: 541 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_paramprob); 542 switch (code) { 543 case ICMP6_PARAMPROB_NEXTHEADER: 544 code = PRC_UNREACH_PROTOCOL; 545 break; 546 case ICMP6_PARAMPROB_HEADER: 547 case ICMP6_PARAMPROB_OPTION: 548 code = PRC_PARAMPROB; 549 break; 550 default: 551 goto badcode; 552 } 553 goto deliver; 554 555 case ICMP6_ECHO_REQUEST: 556 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echo); 557 if (code != 0) 558 goto badcode; 559 /* 560 * Copy mbuf to send to two data paths: userland socket(s), 561 * and to the querier (echo reply). 562 * m: a copy for socket, n: a copy for querier 563 */ 564 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 565 /* Give up local */ 566 n = m; 567 m = NULL; 568 goto deliverecho; 569 } 570 /* 571 * If the first mbuf is shared, or the first mbuf is too short, 572 * copy the first part of the data into a fresh mbuf. 573 * Otherwise, we will wrongly overwrite both copies. 574 */ 575 if ((n->m_flags & M_EXT) != 0 || 576 n->m_len < off + sizeof(struct icmp6_hdr)) { 577 struct mbuf *n0 = n; 578 const int maxlen = sizeof(*nip6) + sizeof(*nicmp6); 579 580 /* 581 * Prepare an internal mbuf. m_pullup() doesn't 582 * always copy the length we specified. 583 */ 584 if (maxlen >= MCLBYTES) { 585 /* Give up remote */ 586 m_freem(n0); 587 break; 588 } 589 MGETHDR(n, M_DONTWAIT, n0->m_type); 590 if (n && maxlen >= MHLEN) { 591 MCLGET(n, M_DONTWAIT); 592 if ((n->m_flags & M_EXT) == 0) { 593 m_free(n); 594 n = NULL; 595 } 596 } 597 if (n == NULL) { 598 /* Give up local */ 599 m_freem(n0); 600 n = m; 601 m = NULL; 602 goto deliverecho; 603 } 604 M_COPY_PKTHDR(n, n0); 605 /* 606 * Copy IPv6 and ICMPv6 only. 607 */ 608 nip6 = mtod(n, struct ip6_hdr *); 609 bcopy(ip6, nip6, sizeof(struct ip6_hdr)); 610 nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 611 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); 612 noff = sizeof(struct ip6_hdr); 613 n->m_len = noff + sizeof(struct icmp6_hdr); 614 /* 615 * Adjust mbuf. ip6_plen will be adjusted in 616 * ip6_output(). 617 * n->m_pkthdr.len == n0->m_pkthdr.len at this point. 618 */ 619 n->m_pkthdr.len += noff + sizeof(struct icmp6_hdr); 620 n->m_pkthdr.len -= (off + sizeof(struct icmp6_hdr)); 621 m_adj(n0, off + sizeof(struct icmp6_hdr)); 622 n->m_next = n0; 623 n0->m_flags &= ~M_PKTHDR; 624 } else { 625 deliverecho: 626 nip6 = mtod(n, struct ip6_hdr *); 627 nicmp6 = (struct icmp6_hdr *)((caddr_t)nip6 + off); 628 noff = off; 629 } 630 nicmp6->icmp6_type = ICMP6_ECHO_REPLY; 631 nicmp6->icmp6_code = 0; 632 if (n) { 633 icmp6stat.icp6s_reflect++; 634 icmp6stat.icp6s_outhist[ICMP6_ECHO_REPLY]++; 635 icmp6_reflect(n, noff); 636 } 637 if (!m) 638 goto freeit; 639 break; 640 641 case ICMP6_ECHO_REPLY: 642 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echoreply); 643 if (code != 0) 644 goto badcode; 645 break; 646 647 case MLD_LISTENER_QUERY: 648 case MLD_LISTENER_REPORT: 649 if (icmp6len < sizeof(struct mld_hdr)) 650 goto badlen; 651 if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */ 652 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldquery); 653 else 654 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldreport); 655 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 656 /* give up local */ 657 mld6_input(m, off); 658 m = NULL; 659 goto freeit; 660 } 661 mld6_input(n, off); 662 /* m stays. */ 663 break; 664 665 case MLD_LISTENER_DONE: 666 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mlddone); 667 if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */ 668 goto badlen; 669 break; /* nothing to be done in kernel */ 670 671 case MLD_MTRACE_RESP: 672 case MLD_MTRACE: 673 /* XXX: these two are experimental. not officially defined. */ 674 /* XXX: per-interface statistics? */ 675 break; /* just pass it to applications */ 676 677 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */ 678 { 679 enum { WRU, FQDN } mode; 680 681 if (!icmp6_nodeinfo) 682 break; 683 684 if (icmp6len == sizeof(struct icmp6_hdr) + 4) 685 mode = WRU; 686 else if (icmp6len >= sizeof(struct icmp6_nodeinfo)) 687 mode = FQDN; 688 else 689 goto badlen; 690 691 if (mode == FQDN) { 692 n = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 693 if (n) 694 n = ni6_input(n, off); 695 /* XXX meaningless if n == NULL */ 696 noff = sizeof(struct ip6_hdr); 697 } else { 698 u_char *p; 699 int maxlen, maxhlen; 700 701 if ((icmp6_nodeinfo & 5) != 5) 702 break; 703 704 if (code != 0) 705 goto badcode; 706 maxlen = sizeof(*nip6) + sizeof(*nicmp6) + 4; 707 if (maxlen >= MCLBYTES) { 708 /* Give up remote */ 709 break; 710 } 711 MGETHDR(n, M_DONTWAIT, m->m_type); 712 if (n && maxlen > MHLEN) { 713 MCLGET(n, M_DONTWAIT); 714 if ((n->m_flags & M_EXT) == 0) { 715 m_free(n); 716 n = NULL; 717 } 718 } 719 if (n == NULL) { 720 /* Give up remote */ 721 break; 722 } 723 n->m_pkthdr.rcvif = NULL; 724 n->m_len = 0; 725 maxhlen = M_TRAILINGSPACE(n) - maxlen; 726 if (maxhlen > hostnamelen) 727 maxhlen = hostnamelen; 728 /* 729 * Copy IPv6 and ICMPv6 only. 730 */ 731 nip6 = mtod(n, struct ip6_hdr *); 732 bcopy(ip6, nip6, sizeof(struct ip6_hdr)); 733 nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 734 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); 735 p = (u_char *)(nicmp6 + 1); 736 bzero(p, 4); 737 bcopy(hostname, p + 4, maxhlen); /* meaningless TTL */ 738 noff = sizeof(struct ip6_hdr); 739 M_COPY_PKTHDR(n, m); /* just for rcvif */ 740 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 741 sizeof(struct icmp6_hdr) + 4 + maxhlen; 742 nicmp6->icmp6_type = ICMP6_WRUREPLY; 743 nicmp6->icmp6_code = 0; 744 } 745 #undef hostnamelen 746 if (n) { 747 icmp6stat.icp6s_reflect++; 748 icmp6stat.icp6s_outhist[ICMP6_WRUREPLY]++; 749 icmp6_reflect(n, noff); 750 } 751 break; 752 } 753 754 case ICMP6_WRUREPLY: 755 if (code != 0) 756 goto badcode; 757 break; 758 759 case ND_ROUTER_SOLICIT: 760 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routersolicit); 761 if (code != 0) 762 goto badcode; 763 if (icmp6len < sizeof(struct nd_router_solicit)) 764 goto badlen; 765 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 766 /* give up local */ 767 nd6_rs_input(m, off, icmp6len); 768 m = NULL; 769 goto freeit; 770 } 771 nd6_rs_input(n, off, icmp6len); 772 /* m stays. */ 773 break; 774 775 case ND_ROUTER_ADVERT: 776 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routeradvert); 777 if (code != 0) 778 goto badcode; 779 if (icmp6len < sizeof(struct nd_router_advert)) 780 goto badlen; 781 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 782 /* give up local */ 783 nd6_ra_input(m, off, icmp6len); 784 m = NULL; 785 goto freeit; 786 } 787 nd6_ra_input(n, off, icmp6len); 788 /* m stays. */ 789 break; 790 791 case ND_NEIGHBOR_SOLICIT: 792 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighborsolicit); 793 if (code != 0) 794 goto badcode; 795 if (icmp6len < sizeof(struct nd_neighbor_solicit)) 796 goto badlen; 797 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 798 /* give up local */ 799 nd6_ns_input(m, off, icmp6len); 800 m = NULL; 801 goto freeit; 802 } 803 nd6_ns_input(n, off, icmp6len); 804 /* m stays. */ 805 break; 806 807 case ND_NEIGHBOR_ADVERT: 808 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighboradvert); 809 if (code != 0) 810 goto badcode; 811 if (icmp6len < sizeof(struct nd_neighbor_advert)) 812 goto badlen; 813 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 814 /* give up local */ 815 nd6_na_input(m, off, icmp6len); 816 m = NULL; 817 goto freeit; 818 } 819 nd6_na_input(n, off, icmp6len); 820 /* m stays. */ 821 break; 822 823 case ND_REDIRECT: 824 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_redirect); 825 if (code != 0) 826 goto badcode; 827 if (icmp6len < sizeof(struct nd_redirect)) 828 goto badlen; 829 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 830 /* give up local */ 831 icmp6_redirect_input(m, off); 832 m = NULL; 833 goto freeit; 834 } 835 icmp6_redirect_input(n, off); 836 /* m stays. */ 837 break; 838 839 case ICMP6_ROUTER_RENUMBERING: 840 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND && 841 code != ICMP6_ROUTER_RENUMBERING_RESULT) 842 goto badcode; 843 if (icmp6len < sizeof(struct icmp6_router_renum)) 844 goto badlen; 845 break; 846 847 default: 848 nd6log((LOG_DEBUG, 849 "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n", 850 icmp6->icmp6_type, ip6_sprintf(&ip6->ip6_src), 851 ip6_sprintf(&ip6->ip6_dst), 852 m->m_pkthdr.rcvif ? m->m_pkthdr.rcvif->if_index : 0)); 853 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) { 854 /* ICMPv6 error: MUST deliver it by spec... */ 855 code = PRC_NCMDS; 856 /* deliver */ 857 } else { 858 /* ICMPv6 informational: MUST not deliver */ 859 break; 860 } 861 deliver: 862 if (icmp6_notify_error(m, off, icmp6len, code)) { 863 /* In this case, m should've been freed. */ 864 return (IPPROTO_DONE); 865 } 866 break; 867 868 badcode: 869 icmp6stat.icp6s_badcode++; 870 break; 871 872 badlen: 873 icmp6stat.icp6s_badlen++; 874 break; 875 } 876 877 /* deliver the packet to appropriate sockets */ 878 icmp6_rip6_input(&m, *offp); 879 880 return IPPROTO_DONE; 881 882 freeit: 883 m_freem(m); 884 return IPPROTO_DONE; 885 } 886 887 static int 888 icmp6_notify_error(m, off, icmp6len, code) 889 struct mbuf *m; 890 int off, icmp6len; 891 { 892 struct icmp6_hdr *icmp6; 893 struct ip6_hdr *eip6; 894 u_int32_t notifymtu; 895 struct sockaddr_in6 icmp6src, icmp6dst; 896 897 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) { 898 icmp6stat.icp6s_tooshort++; 899 goto freeit; 900 } 901 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 902 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 903 if (icmp6 == NULL) { 904 icmp6stat.icp6s_tooshort++; 905 return (-1); 906 } 907 eip6 = (struct ip6_hdr *)(icmp6 + 1); 908 909 /* Detect the upper level protocol */ 910 { 911 void (*ctlfunc) __P((int, struct sockaddr *, void *)); 912 u_int8_t nxt = eip6->ip6_nxt; 913 int eoff = off + sizeof(struct icmp6_hdr) + 914 sizeof(struct ip6_hdr); 915 struct ip6ctlparam ip6cp; 916 struct in6_addr *finaldst = NULL; 917 int icmp6type = icmp6->icmp6_type; 918 struct ip6_frag *fh; 919 struct ip6_rthdr *rth; 920 struct ip6_rthdr0 *rth0; 921 int rthlen; 922 923 while (1) { /* XXX: should avoid infinite loop explicitly? */ 924 struct ip6_ext *eh; 925 926 switch (nxt) { 927 case IPPROTO_HOPOPTS: 928 case IPPROTO_DSTOPTS: 929 case IPPROTO_AH: 930 IP6_EXTHDR_GET(eh, struct ip6_ext *, m, 931 eoff, sizeof(*eh)); 932 if (eh == NULL) { 933 icmp6stat.icp6s_tooshort++; 934 return (-1); 935 } 936 937 if (nxt == IPPROTO_AH) 938 eoff += (eh->ip6e_len + 2) << 2; 939 else 940 eoff += (eh->ip6e_len + 1) << 3; 941 nxt = eh->ip6e_nxt; 942 break; 943 case IPPROTO_ROUTING: 944 /* 945 * When the erroneous packet contains a 946 * routing header, we should examine the 947 * header to determine the final destination. 948 * Otherwise, we can't properly update 949 * information that depends on the final 950 * destination (e.g. path MTU). 951 */ 952 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m, 953 eoff, sizeof(*rth)); 954 if (rth == NULL) { 955 icmp6stat.icp6s_tooshort++; 956 return (-1); 957 } 958 rthlen = (rth->ip6r_len + 1) << 3; 959 /* 960 * XXX: currently there is no 961 * officially defined type other 962 * than type-0. 963 * Note that if the segment left field 964 * is 0, all intermediate hops must 965 * have been passed. 966 */ 967 if (rth->ip6r_segleft && 968 rth->ip6r_type == IPV6_RTHDR_TYPE_0) { 969 int hops; 970 971 IP6_EXTHDR_GET(rth0, 972 struct ip6_rthdr0 *, m, 973 eoff, rthlen); 974 if (rth0 == NULL) { 975 icmp6stat.icp6s_tooshort++; 976 return (-1); 977 } 978 /* just ignore a bogus header */ 979 if ((rth0->ip6r0_len % 2) == 0 && 980 (hops = rth0->ip6r0_len/2)) 981 finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1); 982 } 983 eoff += rthlen; 984 nxt = rth->ip6r_nxt; 985 break; 986 case IPPROTO_FRAGMENT: 987 IP6_EXTHDR_GET(fh, struct ip6_frag *, m, 988 eoff, sizeof(*fh)); 989 if (fh == NULL) { 990 icmp6stat.icp6s_tooshort++; 991 return (-1); 992 } 993 /* 994 * Data after a fragment header is meaningless 995 * unless it is the first fragment, but 996 * we'll go to the notify label for path MTU 997 * discovery. 998 */ 999 if (fh->ip6f_offlg & IP6F_OFF_MASK) 1000 goto notify; 1001 1002 eoff += sizeof(struct ip6_frag); 1003 nxt = fh->ip6f_nxt; 1004 break; 1005 default: 1006 /* 1007 * This case includes ESP and the No Next 1008 * Header. In such cases going to the notify 1009 * label does not have any meaning 1010 * (i.e. ctlfunc will be NULL), but we go 1011 * anyway since we might have to update 1012 * path MTU information. 1013 */ 1014 goto notify; 1015 } 1016 } 1017 notify: 1018 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 1019 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 1020 if (icmp6 == NULL) { 1021 icmp6stat.icp6s_tooshort++; 1022 return (-1); 1023 } 1024 1025 eip6 = (struct ip6_hdr *)(icmp6 + 1); 1026 bzero(&icmp6dst, sizeof(icmp6dst)); 1027 icmp6dst.sin6_len = sizeof(struct sockaddr_in6); 1028 icmp6dst.sin6_family = AF_INET6; 1029 if (finaldst == NULL) 1030 icmp6dst.sin6_addr = eip6->ip6_dst; 1031 else 1032 icmp6dst.sin6_addr = *finaldst; 1033 icmp6dst.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif, 1034 &icmp6dst.sin6_addr); 1035 #ifndef SCOPEDROUTING 1036 if (in6_embedscope(&icmp6dst.sin6_addr, &icmp6dst, 1037 NULL, NULL)) { 1038 /* should be impossbile */ 1039 nd6log((LOG_DEBUG, 1040 "icmp6_notify_error: in6_embedscope failed\n")); 1041 goto freeit; 1042 } 1043 #endif 1044 1045 /* 1046 * retrieve parameters from the inner IPv6 header, and convert 1047 * them into sockaddr structures. 1048 */ 1049 bzero(&icmp6src, sizeof(icmp6src)); 1050 icmp6src.sin6_len = sizeof(struct sockaddr_in6); 1051 icmp6src.sin6_family = AF_INET6; 1052 icmp6src.sin6_addr = eip6->ip6_src; 1053 icmp6src.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif, 1054 &icmp6src.sin6_addr); 1055 #ifndef SCOPEDROUTING 1056 if (in6_embedscope(&icmp6src.sin6_addr, &icmp6src, 1057 NULL, NULL)) { 1058 /* should be impossbile */ 1059 nd6log((LOG_DEBUG, 1060 "icmp6_notify_error: in6_embedscope failed\n")); 1061 goto freeit; 1062 } 1063 #endif 1064 icmp6src.sin6_flowinfo = 1065 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK); 1066 1067 if (finaldst == NULL) 1068 finaldst = &eip6->ip6_dst; 1069 ip6cp.ip6c_m = m; 1070 ip6cp.ip6c_icmp6 = icmp6; 1071 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1); 1072 ip6cp.ip6c_off = eoff; 1073 ip6cp.ip6c_finaldst = finaldst; 1074 ip6cp.ip6c_src = &icmp6src; 1075 ip6cp.ip6c_nxt = nxt; 1076 1077 if (icmp6type == ICMP6_PACKET_TOO_BIG) { 1078 notifymtu = ntohl(icmp6->icmp6_mtu); 1079 ip6cp.ip6c_cmdarg = (void *)¬ifymtu; 1080 } 1081 1082 ctlfunc = (void (*) __P((int, struct sockaddr *, void *))) 1083 (inet6sw[ip6_protox[nxt]].pr_ctlinput); 1084 if (ctlfunc) { 1085 (void) (*ctlfunc)(code, (struct sockaddr *)&icmp6dst, 1086 &ip6cp); 1087 } 1088 } 1089 return (0); 1090 1091 freeit: 1092 m_freem(m); 1093 return (-1); 1094 } 1095 1096 void 1097 icmp6_mtudisc_update(ip6cp, validated) 1098 struct ip6ctlparam *ip6cp; 1099 int validated; 1100 { 1101 unsigned long rtcount; 1102 struct icmp6_mtudisc_callback *mc; 1103 struct in6_addr *dst = ip6cp->ip6c_finaldst; 1104 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6; 1105 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */ 1106 u_int mtu = ntohl(icmp6->icmp6_mtu); 1107 struct rtentry *rt = NULL; 1108 struct sockaddr_in6 sin6; 1109 1110 /* 1111 * allow non-validated cases if memory is plenty, to make traffic 1112 * from non-connected pcb happy. 1113 */ 1114 rtcount = rt_timer_count(icmp6_mtudisc_timeout_q); 1115 if (validated) { 1116 if (0 <= icmp6_mtudisc_hiwat && rtcount > icmp6_mtudisc_hiwat) 1117 return; 1118 else if (0 <= icmp6_mtudisc_lowat && 1119 rtcount > icmp6_mtudisc_lowat) { 1120 /* 1121 * XXX nuke a victim, install the new one. 1122 */ 1123 } 1124 } else { 1125 if (0 <= icmp6_mtudisc_lowat && rtcount > icmp6_mtudisc_lowat) 1126 return; 1127 } 1128 1129 bzero(&sin6, sizeof(sin6)); 1130 sin6.sin6_family = PF_INET6; 1131 sin6.sin6_len = sizeof(struct sockaddr_in6); 1132 sin6.sin6_addr = *dst; 1133 /* XXX normally, this won't happen */ 1134 if (IN6_IS_ADDR_LINKLOCAL(dst)) { 1135 sin6.sin6_addr.s6_addr16[1] = 1136 htons(m->m_pkthdr.rcvif->if_index); 1137 } 1138 /* sin6.sin6_scope_id = XXX: should be set if DST is a scoped addr */ 1139 rt = icmp6_mtudisc_clone((struct sockaddr *)&sin6); 1140 1141 if (rt && (rt->rt_flags & RTF_HOST) && 1142 !(rt->rt_rmx.rmx_locks & RTV_MTU) && 1143 (rt->rt_rmx.rmx_mtu > mtu || rt->rt_rmx.rmx_mtu == 0)) { 1144 if (mtu < IN6_LINKMTU(rt->rt_ifp)) { 1145 icmp6stat.icp6s_pmtuchg++; 1146 rt->rt_rmx.rmx_mtu = mtu; 1147 } 1148 } 1149 if (rt) { /* XXX: need braces to avoid conflict with else in RTFREE. */ 1150 RTFREE(rt); 1151 } 1152 1153 /* 1154 * Notify protocols that the MTU for this destination 1155 * has changed. 1156 */ 1157 for (mc = LIST_FIRST(&icmp6_mtudisc_callbacks); mc != NULL; 1158 mc = LIST_NEXT(mc, mc_list)) 1159 (*mc->mc_func)(&sin6.sin6_addr); 1160 } 1161 1162 /* 1163 * Process a Node Information Query packet, based on 1164 * draft-ietf-ipngwg-icmp-name-lookups-07. 1165 * 1166 * Spec incompatibilities: 1167 * - IPv6 Subject address handling 1168 * - IPv4 Subject address handling support missing 1169 * - Proxy reply (answer even if it's not for me) 1170 * - joins NI group address at in6_ifattach() time only, does not cope 1171 * with hostname changes by sethostname(3) 1172 */ 1173 #ifndef offsetof /* XXX */ 1174 #define offsetof(type, member) ((size_t)(&((type *)0)->member)) 1175 #endif 1176 static struct mbuf * 1177 ni6_input(m, off) 1178 struct mbuf *m; 1179 int off; 1180 { 1181 struct icmp6_nodeinfo *ni6, *nni6; 1182 struct mbuf *n = NULL; 1183 u_int16_t qtype; 1184 int subjlen; 1185 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1186 struct ni_reply_fqdn *fqdn; 1187 int addrs; /* for NI_QTYPE_NODEADDR */ 1188 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */ 1189 struct sockaddr_in6 sin6; /* double meaning; ip6_dst and subjectaddr */ 1190 struct ip6_hdr *ip6; 1191 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */ 1192 char *subj = NULL; 1193 1194 ip6 = mtod(m, struct ip6_hdr *); 1195 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6)); 1196 if (ni6 == NULL) { 1197 /* m is already reclaimed */ 1198 return NULL; 1199 } 1200 1201 /* 1202 * Validate IPv6 destination address. 1203 * 1204 * The Responder must discard the Query without further processing 1205 * unless it is one of the Responder's unicast or anycast addresses, or 1206 * a link-local scope multicast address which the Responder has joined. 1207 * [icmp-name-lookups-07, Section 4.] 1208 */ 1209 bzero(&sin6, sizeof(sin6)); 1210 sin6.sin6_family = AF_INET6; 1211 sin6.sin6_len = sizeof(struct sockaddr_in6); 1212 bcopy(&ip6->ip6_dst, &sin6.sin6_addr, sizeof(sin6.sin6_addr)); 1213 /* XXX scopeid */ 1214 if (ifa_ifwithaddr((struct sockaddr *)&sin6)) 1215 ; /* unicast/anycast, fine */ 1216 else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr)) 1217 ; /* link-local multicast, fine */ 1218 else 1219 goto bad; 1220 1221 /* validate query Subject field. */ 1222 qtype = ntohs(ni6->ni_qtype); 1223 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo); 1224 switch (qtype) { 1225 case NI_QTYPE_NOOP: 1226 case NI_QTYPE_SUPTYPES: 1227 /* 07 draft */ 1228 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0) 1229 break; 1230 /* FALLTHROUGH */ 1231 case NI_QTYPE_FQDN: 1232 case NI_QTYPE_NODEADDR: 1233 switch (ni6->ni_code) { 1234 case ICMP6_NI_SUBJ_IPV6: 1235 #if ICMP6_NI_SUBJ_IPV6 != 0 1236 case 0: 1237 #endif 1238 /* 1239 * backward compatibility - try to accept 03 draft 1240 * format, where no Subject is present. 1241 */ 1242 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 && 1243 subjlen == 0) { 1244 oldfqdn++; 1245 break; 1246 } 1247 #if ICMP6_NI_SUBJ_IPV6 != 0 1248 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6) 1249 goto bad; 1250 #endif 1251 1252 if (subjlen != sizeof(sin6.sin6_addr)) 1253 goto bad; 1254 1255 /* 1256 * Validate Subject address. 1257 * 1258 * Not sure what exactly "address belongs to the node" 1259 * means in the spec, is it just unicast, or what? 1260 * 1261 * At this moment we consider Subject address as 1262 * "belong to the node" if the Subject address equals 1263 * to the IPv6 destination address; validation for 1264 * IPv6 destination address should have done enough 1265 * check for us. 1266 * 1267 * We do not do proxy at this moment. 1268 */ 1269 /* m_pulldown instead of copy? */ 1270 m_copydata(m, off + sizeof(struct icmp6_nodeinfo), 1271 subjlen, (caddr_t)&sin6.sin6_addr); 1272 /* XXX kame scope hack */ 1273 if (IN6_IS_SCOPE_LINKLOCAL(&sin6.sin6_addr)) { 1274 if ((m->m_flags & M_PKTHDR) != 0 && 1275 m->m_pkthdr.rcvif) { 1276 sin6.sin6_addr.s6_addr16[1] = 1277 htons(m->m_pkthdr.rcvif->if_index); 1278 } 1279 } 1280 subj = (char *)&sin6; 1281 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &sin6.sin6_addr)) 1282 break; 1283 1284 /* 1285 * XXX if we are to allow other cases, we should really 1286 * be careful about scope here. 1287 * basically, we should disallow queries toward IPv6 1288 * destination X with subject Y, if scope(X) > scope(Y). 1289 * if we allow scope(X) > scope(Y), it will result in 1290 * information leakage across scope boundary. 1291 */ 1292 goto bad; 1293 1294 case ICMP6_NI_SUBJ_FQDN: 1295 /* 1296 * Validate Subject name with gethostname(3). 1297 * 1298 * The behavior may need some debate, since: 1299 * - we are not sure if the node has FQDN as 1300 * hostname (returned by gethostname(3)). 1301 * - the code does wildcard match for truncated names. 1302 * however, we are not sure if we want to perform 1303 * wildcard match, if gethostname(3) side has 1304 * truncated hostname. 1305 */ 1306 n = ni6_nametodns(hostname, hostnamelen, 0); 1307 if (!n || n->m_next || n->m_len == 0) 1308 goto bad; 1309 IP6_EXTHDR_GET(subj, char *, m, 1310 off + sizeof(struct icmp6_nodeinfo), subjlen); 1311 if (subj == NULL) 1312 goto bad; 1313 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *), 1314 n->m_len)) { 1315 goto bad; 1316 } 1317 m_freem(n); 1318 n = NULL; 1319 break; 1320 1321 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */ 1322 default: 1323 goto bad; 1324 } 1325 break; 1326 } 1327 1328 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */ 1329 switch (qtype) { 1330 case NI_QTYPE_FQDN: 1331 if ((icmp6_nodeinfo & 1) == 0) 1332 goto bad; 1333 break; 1334 case NI_QTYPE_NODEADDR: 1335 if ((icmp6_nodeinfo & 2) == 0) 1336 goto bad; 1337 break; 1338 } 1339 1340 /* guess reply length */ 1341 switch (qtype) { 1342 case NI_QTYPE_NOOP: 1343 break; /* no reply data */ 1344 case NI_QTYPE_SUPTYPES: 1345 replylen += sizeof(u_int32_t); 1346 break; 1347 case NI_QTYPE_FQDN: 1348 /* XXX will append an mbuf */ 1349 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1350 break; 1351 case NI_QTYPE_NODEADDR: 1352 addrs = ni6_addrs(ni6, m, &ifp, subj); 1353 if ((replylen += addrs * (sizeof(struct in6_addr) + 1354 sizeof(u_int32_t))) > MCLBYTES) 1355 replylen = MCLBYTES; /* XXX: will truncate pkt later */ 1356 break; 1357 default: 1358 /* 1359 * XXX: We must return a reply with the ICMP6 code 1360 * `unknown Qtype' in this case. However we regard the case 1361 * as an FQDN query for backward compatibility. 1362 * Older versions set a random value to this field, 1363 * so it rarely varies in the defined qtypes. 1364 * But the mechanism is not reliable... 1365 * maybe we should obsolete older versions. 1366 */ 1367 qtype = NI_QTYPE_FQDN; 1368 /* XXX will append an mbuf */ 1369 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1370 oldfqdn++; 1371 break; 1372 } 1373 1374 /* allocate an mbuf to reply. */ 1375 MGETHDR(n, M_DONTWAIT, m->m_type); 1376 if (n == NULL) { 1377 m_freem(m); 1378 return (NULL); 1379 } 1380 M_COPY_PKTHDR(n, m); /* just for rcvif */ 1381 if (replylen > MHLEN) { 1382 if (replylen > MCLBYTES) { 1383 /* 1384 * XXX: should we try to allocate more? But MCLBYTES 1385 * is probably much larger than IPV6_MMTU... 1386 */ 1387 goto bad; 1388 } 1389 MCLGET(n, M_DONTWAIT); 1390 if ((n->m_flags & M_EXT) == 0) { 1391 goto bad; 1392 } 1393 } 1394 n->m_pkthdr.len = n->m_len = replylen; 1395 1396 /* copy mbuf header and IPv6 + Node Information base headers */ 1397 bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr)); 1398 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1); 1399 bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo)); 1400 1401 /* qtype dependent procedure */ 1402 switch (qtype) { 1403 case NI_QTYPE_NOOP: 1404 nni6->ni_code = ICMP6_NI_SUCCESS; 1405 nni6->ni_flags = 0; 1406 break; 1407 case NI_QTYPE_SUPTYPES: 1408 { 1409 u_int32_t v; 1410 nni6->ni_code = ICMP6_NI_SUCCESS; 1411 nni6->ni_flags = htons(0x0000); /* raw bitmap */ 1412 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */ 1413 v = (u_int32_t)htonl(0x0000000f); 1414 bcopy(&v, nni6 + 1, sizeof(u_int32_t)); 1415 break; 1416 } 1417 case NI_QTYPE_FQDN: 1418 nni6->ni_code = ICMP6_NI_SUCCESS; 1419 fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) + 1420 sizeof(struct ip6_hdr) + 1421 sizeof(struct icmp6_nodeinfo)); 1422 nni6->ni_flags = 0; /* XXX: meaningless TTL */ 1423 fqdn->ni_fqdn_ttl = 0; /* ditto. */ 1424 /* 1425 * XXX do we really have FQDN in variable "hostname"? 1426 */ 1427 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn); 1428 if (n->m_next == NULL) 1429 goto bad; 1430 /* XXX we assume that n->m_next is not a chain */ 1431 if (n->m_next->m_next != NULL) 1432 goto bad; 1433 n->m_pkthdr.len += n->m_next->m_len; 1434 break; 1435 case NI_QTYPE_NODEADDR: 1436 { 1437 int lenlim, copied; 1438 1439 nni6->ni_code = ICMP6_NI_SUCCESS; 1440 n->m_pkthdr.len = n->m_len = 1441 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1442 lenlim = M_TRAILINGSPACE(n); 1443 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim); 1444 /* XXX: reset mbuf length */ 1445 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 1446 sizeof(struct icmp6_nodeinfo) + copied; 1447 break; 1448 } 1449 default: 1450 break; /* XXX impossible! */ 1451 } 1452 1453 nni6->ni_type = ICMP6_NI_REPLY; 1454 m_freem(m); 1455 return (n); 1456 1457 bad: 1458 m_freem(m); 1459 if (n) 1460 m_freem(n); 1461 return (NULL); 1462 } 1463 #undef hostnamelen 1464 1465 #define isupper(x) ('A' <= (x) && (x) <= 'Z') 1466 #define isalpha(x) (('A' <= (x) && (x) <= 'Z') || ('a' <= (x) && (x) <= 'z')) 1467 #define isalnum(x) (isalpha(x) || ('0' <= (x) && (x) <= '9')) 1468 #define tolower(x) (isupper(x) ? (x) + 'a' - 'A' : (x)) 1469 1470 /* 1471 * make a mbuf with DNS-encoded string. no compression support. 1472 * 1473 * XXX names with less than 2 dots (like "foo" or "foo.section") will be 1474 * treated as truncated name (two \0 at the end). this is a wild guess. 1475 */ 1476 static struct mbuf * 1477 ni6_nametodns(name, namelen, old) 1478 const char *name; 1479 int namelen; 1480 int old; /* return pascal string if non-zero */ 1481 { 1482 struct mbuf *m; 1483 char *cp, *ep; 1484 const char *p, *q; 1485 int i, len, nterm; 1486 1487 if (old) 1488 len = namelen + 1; 1489 else 1490 len = MCLBYTES; 1491 1492 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */ 1493 MGET(m, M_DONTWAIT, MT_DATA); 1494 if (m && len > MLEN) { 1495 MCLGET(m, M_DONTWAIT); 1496 if ((m->m_flags & M_EXT) == 0) 1497 goto fail; 1498 } 1499 if (!m) 1500 goto fail; 1501 m->m_next = NULL; 1502 1503 if (old) { 1504 m->m_len = len; 1505 *mtod(m, char *) = namelen; 1506 bcopy(name, mtod(m, char *) + 1, namelen); 1507 return m; 1508 } else { 1509 m->m_len = 0; 1510 cp = mtod(m, char *); 1511 ep = mtod(m, char *) + M_TRAILINGSPACE(m); 1512 1513 /* if not certain about my name, return empty buffer */ 1514 if (namelen == 0) 1515 return m; 1516 1517 /* 1518 * guess if it looks like shortened hostname, or FQDN. 1519 * shortened hostname needs two trailing "\0". 1520 */ 1521 i = 0; 1522 for (p = name; p < name + namelen; p++) { 1523 if (*p && *p == '.') 1524 i++; 1525 } 1526 if (i < 2) 1527 nterm = 2; 1528 else 1529 nterm = 1; 1530 1531 p = name; 1532 while (cp < ep && p < name + namelen) { 1533 i = 0; 1534 for (q = p; q < name + namelen && *q && *q != '.'; q++) 1535 i++; 1536 /* result does not fit into mbuf */ 1537 if (cp + i + 1 >= ep) 1538 goto fail; 1539 /* 1540 * DNS label length restriction, RFC1035 page 8. 1541 * "i == 0" case is included here to avoid returning 1542 * 0-length label on "foo..bar". 1543 */ 1544 if (i <= 0 || i >= 64) 1545 goto fail; 1546 *cp++ = i; 1547 if (!isalpha(p[0]) || !isalnum(p[i - 1])) 1548 goto fail; 1549 while (i > 0) { 1550 if (!isalnum(*p) && *p != '-') 1551 goto fail; 1552 if (isupper(*p)) { 1553 *cp++ = tolower(*p); 1554 p++; 1555 } else 1556 *cp++ = *p++; 1557 i--; 1558 } 1559 p = q; 1560 if (p < name + namelen && *p == '.') 1561 p++; 1562 } 1563 /* termination */ 1564 if (cp + nterm >= ep) 1565 goto fail; 1566 while (nterm-- > 0) 1567 *cp++ = '\0'; 1568 m->m_len = cp - mtod(m, char *); 1569 return m; 1570 } 1571 1572 panic("should not reach here"); 1573 /* NOTREACHED */ 1574 1575 fail: 1576 if (m) 1577 m_freem(m); 1578 return NULL; 1579 } 1580 1581 /* 1582 * check if two DNS-encoded string matches. takes care of truncated 1583 * form (with \0\0 at the end). no compression support. 1584 * XXX upper/lowercase match (see RFC2065) 1585 */ 1586 static int 1587 ni6_dnsmatch(a, alen, b, blen) 1588 const char *a; 1589 int alen; 1590 const char *b; 1591 int blen; 1592 { 1593 const char *a0, *b0; 1594 int l; 1595 1596 /* simplest case - need validation? */ 1597 if (alen == blen && bcmp(a, b, alen) == 0) 1598 return 1; 1599 1600 a0 = a; 1601 b0 = b; 1602 1603 /* termination is mandatory */ 1604 if (alen < 2 || blen < 2) 1605 return 0; 1606 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0') 1607 return 0; 1608 alen--; 1609 blen--; 1610 1611 while (a - a0 < alen && b - b0 < blen) { 1612 if (a - a0 + 1 > alen || b - b0 + 1 > blen) 1613 return 0; 1614 1615 if ((signed char)a[0] < 0 || (signed char)b[0] < 0) 1616 return 0; 1617 /* we don't support compression yet */ 1618 if (a[0] >= 64 || b[0] >= 64) 1619 return 0; 1620 1621 /* truncated case */ 1622 if (a[0] == 0 && a - a0 == alen - 1) 1623 return 1; 1624 if (b[0] == 0 && b - b0 == blen - 1) 1625 return 1; 1626 if (a[0] == 0 || b[0] == 0) 1627 return 0; 1628 1629 if (a[0] != b[0]) 1630 return 0; 1631 l = a[0]; 1632 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen) 1633 return 0; 1634 if (bcmp(a + 1, b + 1, l) != 0) 1635 return 0; 1636 1637 a += 1 + l; 1638 b += 1 + l; 1639 } 1640 1641 if (a - a0 == alen && b - b0 == blen) 1642 return 1; 1643 else 1644 return 0; 1645 } 1646 1647 /* 1648 * calculate the number of addresses to be returned in the node info reply. 1649 */ 1650 static int 1651 ni6_addrs(ni6, m, ifpp, subj) 1652 struct icmp6_nodeinfo *ni6; 1653 struct mbuf *m; 1654 struct ifnet **ifpp; 1655 char *subj; 1656 { 1657 struct ifnet *ifp; 1658 struct in6_ifaddr *ifa6; 1659 struct ifaddr *ifa; 1660 struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */ 1661 int addrs = 0, addrsofif, iffound = 0; 1662 int niflags = ni6->ni_flags; 1663 1664 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) { 1665 switch (ni6->ni_code) { 1666 case ICMP6_NI_SUBJ_IPV6: 1667 if (subj == NULL) /* must be impossible... */ 1668 return (0); 1669 subj_ip6 = (struct sockaddr_in6 *)subj; 1670 break; 1671 default: 1672 /* 1673 * XXX: we only support IPv6 subject address for 1674 * this Qtype. 1675 */ 1676 return (0); 1677 } 1678 } 1679 1680 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) 1681 { 1682 addrsofif = 0; 1683 for (ifa = ifp->if_addrlist.tqh_first; ifa; 1684 ifa = ifa->ifa_list.tqe_next) 1685 { 1686 if (ifa->ifa_addr->sa_family != AF_INET6) 1687 continue; 1688 ifa6 = (struct in6_ifaddr *)ifa; 1689 1690 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 && 1691 IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr, 1692 &ifa6->ia_addr.sin6_addr)) 1693 iffound = 1; 1694 1695 /* 1696 * IPv4-mapped addresses can only be returned by a 1697 * Node Information proxy, since they represent 1698 * addresses of IPv4-only nodes, which perforce do 1699 * not implement this protocol. 1700 * [icmp-name-lookups-07, Section 5.4] 1701 * So we don't support NI_NODEADDR_FLAG_COMPAT in 1702 * this function at this moment. 1703 */ 1704 1705 /* What do we have to do about ::1? */ 1706 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) { 1707 case IPV6_ADDR_SCOPE_LINKLOCAL: 1708 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1709 continue; 1710 break; 1711 case IPV6_ADDR_SCOPE_SITELOCAL: 1712 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1713 continue; 1714 break; 1715 case IPV6_ADDR_SCOPE_GLOBAL: 1716 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1717 continue; 1718 break; 1719 default: 1720 continue; 1721 } 1722 1723 /* 1724 * check if anycast is okay. 1725 * XXX: just experimental. not in the spec. 1726 */ 1727 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1728 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 1729 continue; /* we need only unicast addresses */ 1730 1731 addrsofif++; /* count the address */ 1732 } 1733 if (iffound) { 1734 *ifpp = ifp; 1735 return (addrsofif); 1736 } 1737 1738 addrs += addrsofif; 1739 } 1740 1741 return (addrs); 1742 } 1743 1744 static int 1745 ni6_store_addrs(ni6, nni6, ifp0, resid) 1746 struct icmp6_nodeinfo *ni6, *nni6; 1747 struct ifnet *ifp0; 1748 int resid; 1749 { 1750 struct ifnet *ifp = ifp0 ? ifp0 : TAILQ_FIRST(&ifnet); 1751 struct in6_ifaddr *ifa6; 1752 struct ifaddr *ifa; 1753 struct ifnet *ifp_dep = NULL; 1754 int copied = 0, allow_deprecated = 0; 1755 u_char *cp = (u_char *)(nni6 + 1); 1756 int niflags = ni6->ni_flags; 1757 u_int32_t ltime; 1758 1759 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL)) 1760 return (0); /* needless to copy */ 1761 1762 again: 1763 1764 for (; ifp; ifp = TAILQ_NEXT(ifp, if_list)) 1765 { 1766 for (ifa = ifp->if_addrlist.tqh_first; ifa; 1767 ifa = ifa->ifa_list.tqe_next) 1768 { 1769 if (ifa->ifa_addr->sa_family != AF_INET6) 1770 continue; 1771 ifa6 = (struct in6_ifaddr *)ifa; 1772 1773 if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) != 0 && 1774 allow_deprecated == 0) { 1775 /* 1776 * prefererred address should be put before 1777 * deprecated addresses. 1778 */ 1779 1780 /* record the interface for later search */ 1781 if (ifp_dep == NULL) 1782 ifp_dep = ifp; 1783 1784 continue; 1785 } 1786 else if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) == 0 && 1787 allow_deprecated != 0) 1788 continue; /* we now collect deprecated addrs */ 1789 1790 /* What do we have to do about ::1? */ 1791 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) { 1792 case IPV6_ADDR_SCOPE_LINKLOCAL: 1793 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1794 continue; 1795 break; 1796 case IPV6_ADDR_SCOPE_SITELOCAL: 1797 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1798 continue; 1799 break; 1800 case IPV6_ADDR_SCOPE_GLOBAL: 1801 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1802 continue; 1803 break; 1804 default: 1805 continue; 1806 } 1807 1808 /* 1809 * check if anycast is okay. 1810 * XXX: just experimental. not in the spec. 1811 */ 1812 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1813 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 1814 continue; 1815 1816 /* now we can copy the address */ 1817 if (resid < sizeof(struct in6_addr) + 1818 sizeof(u_int32_t)) { 1819 /* 1820 * We give up much more copy. 1821 * Set the truncate flag and return. 1822 */ 1823 nni6->ni_flags |= 1824 NI_NODEADDR_FLAG_TRUNCATE; 1825 return (copied); 1826 } 1827 1828 /* 1829 * Set the TTL of the address. 1830 * The TTL value should be one of the following 1831 * according to the specification: 1832 * 1833 * 1. The remaining lifetime of a DHCP lease on the 1834 * address, or 1835 * 2. The remaining Valid Lifetime of a prefix from 1836 * which the address was derived through Stateless 1837 * Autoconfiguration. 1838 * 1839 * Note that we currently do not support stateful 1840 * address configuration by DHCPv6, so the former 1841 * case can't happen. 1842 * 1843 * TTL must be 2^31 > TTL >= 0. 1844 */ 1845 if (ifa6->ia6_lifetime.ia6t_expire == 0) 1846 ltime = ND6_INFINITE_LIFETIME; 1847 else { 1848 if (ifa6->ia6_lifetime.ia6t_expire > 1849 time.tv_sec) 1850 ltime = ifa6->ia6_lifetime.ia6t_expire - time.tv_sec; 1851 else 1852 ltime = 0; 1853 } 1854 if (ltime > 0x7fffffff) 1855 ltime = 0x7fffffff; 1856 ltime = htonl(ltime); 1857 1858 bcopy(<ime, cp, sizeof(u_int32_t)); 1859 cp += sizeof(u_int32_t); 1860 1861 /* copy the address itself */ 1862 bcopy(&ifa6->ia_addr.sin6_addr, cp, 1863 sizeof(struct in6_addr)); 1864 /* XXX: KAME link-local hack; remove ifindex */ 1865 if (IN6_IS_ADDR_LINKLOCAL(&ifa6->ia_addr.sin6_addr)) 1866 ((struct in6_addr *)cp)->s6_addr16[1] = 0; 1867 cp += sizeof(struct in6_addr); 1868 1869 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1870 copied += (sizeof(struct in6_addr) + 1871 sizeof(u_int32_t)); 1872 } 1873 if (ifp0) /* we need search only on the specified IF */ 1874 break; 1875 } 1876 1877 if (allow_deprecated == 0 && ifp_dep != NULL) { 1878 ifp = ifp_dep; 1879 allow_deprecated = 1; 1880 1881 goto again; 1882 } 1883 1884 return (copied); 1885 } 1886 1887 /* 1888 * XXX almost dup'ed code with rip6_input. 1889 */ 1890 static int 1891 icmp6_rip6_input(mp, off) 1892 struct mbuf **mp; 1893 int off; 1894 { 1895 struct mbuf *m = *mp; 1896 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1897 struct inpcb_hdr *inph; 1898 struct in6pcb *in6p; 1899 struct in6pcb *last = NULL; 1900 struct sockaddr_in6 rip6src; 1901 struct icmp6_hdr *icmp6; 1902 struct mbuf *opts = NULL; 1903 1904 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 1905 if (icmp6 == NULL) { 1906 /* m is already reclaimed */ 1907 return IPPROTO_DONE; 1908 } 1909 1910 bzero(&rip6src, sizeof(rip6src)); 1911 rip6src.sin6_len = sizeof(struct sockaddr_in6); 1912 rip6src.sin6_family = AF_INET6; 1913 /* KAME hack: recover scopeid */ 1914 (void)in6_recoverscope(&rip6src, &ip6->ip6_src, m->m_pkthdr.rcvif); 1915 1916 CIRCLEQ_FOREACH(inph, &raw6cbtable.inpt_queue, inph_queue) { 1917 in6p = (struct in6pcb *)inph; 1918 if (in6p->in6p_af != AF_INET6) 1919 continue; 1920 if (in6p->in6p_ip6.ip6_nxt != IPPROTO_ICMPV6) 1921 continue; 1922 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && 1923 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst)) 1924 continue; 1925 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) && 1926 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src)) 1927 continue; 1928 if (in6p->in6p_icmp6filt 1929 && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type, 1930 in6p->in6p_icmp6filt)) 1931 continue; 1932 if (last) { 1933 struct mbuf *n; 1934 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { 1935 if (last->in6p_flags & IN6P_CONTROLOPTS) 1936 ip6_savecontrol(last, &opts, ip6, n); 1937 /* strip intermediate headers */ 1938 m_adj(n, off); 1939 if (sbappendaddr(&last->in6p_socket->so_rcv, 1940 (struct sockaddr *)&rip6src, 1941 n, opts) == 0) { 1942 /* should notify about lost packet */ 1943 m_freem(n); 1944 if (opts) 1945 m_freem(opts); 1946 } else 1947 sorwakeup(last->in6p_socket); 1948 opts = NULL; 1949 } 1950 } 1951 last = in6p; 1952 } 1953 if (last) { 1954 if (last->in6p_flags & IN6P_CONTROLOPTS) 1955 ip6_savecontrol(last, &opts, ip6, m); 1956 /* strip intermediate headers */ 1957 m_adj(m, off); 1958 if (sbappendaddr(&last->in6p_socket->so_rcv, 1959 (struct sockaddr *)&rip6src, m, opts) == 0) { 1960 m_freem(m); 1961 if (opts) 1962 m_freem(opts); 1963 } else 1964 sorwakeup(last->in6p_socket); 1965 } else { 1966 m_freem(m); 1967 ip6stat.ip6s_delivered--; 1968 } 1969 return IPPROTO_DONE; 1970 } 1971 1972 /* 1973 * Reflect the ip6 packet back to the source. 1974 * OFF points to the icmp6 header, counted from the top of the mbuf. 1975 * 1976 * Note: RFC 1885 required that an echo reply should be truncated if it 1977 * did not fit in with (return) path MTU, and KAME code supported the 1978 * behavior. However, as a clarification after the RFC, this limitation 1979 * was removed in a revised version of the spec, RFC 2463. We had kept the 1980 * old behavior, with a (non-default) ifdef block, while the new version of 1981 * the spec was an internet-draft status, and even after the new RFC was 1982 * published. But it would rather make sense to clean the obsoleted part 1983 * up, and to make the code simpler at this stage. 1984 */ 1985 void 1986 icmp6_reflect(m, off) 1987 struct mbuf *m; 1988 size_t off; 1989 { 1990 struct ip6_hdr *ip6; 1991 struct icmp6_hdr *icmp6; 1992 struct in6_ifaddr *ia; 1993 struct in6_addr t, *src = 0; 1994 int plen; 1995 int type, code; 1996 struct ifnet *outif = NULL; 1997 struct sockaddr_in6 sa6_src, sa6_dst; 1998 1999 /* too short to reflect */ 2000 if (off < sizeof(struct ip6_hdr)) { 2001 nd6log((LOG_DEBUG, 2002 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n", 2003 (u_long)off, (u_long)sizeof(struct ip6_hdr), 2004 __FILE__, __LINE__)); 2005 goto bad; 2006 } 2007 2008 /* 2009 * If there are extra headers between IPv6 and ICMPv6, strip 2010 * off that header first. 2011 */ 2012 #ifdef DIAGNOSTIC 2013 if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN) 2014 panic("assumption failed in icmp6_reflect"); 2015 #endif 2016 if (off > sizeof(struct ip6_hdr)) { 2017 size_t l; 2018 struct ip6_hdr nip6; 2019 2020 l = off - sizeof(struct ip6_hdr); 2021 m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6); 2022 m_adj(m, l); 2023 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2024 if (m->m_len < l) { 2025 if ((m = m_pullup(m, l)) == NULL) 2026 return; 2027 } 2028 bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6)); 2029 } else /* off == sizeof(struct ip6_hdr) */ { 2030 size_t l; 2031 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2032 if (m->m_len < l) { 2033 if ((m = m_pullup(m, l)) == NULL) 2034 return; 2035 } 2036 } 2037 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr); 2038 ip6 = mtod(m, struct ip6_hdr *); 2039 ip6->ip6_nxt = IPPROTO_ICMPV6; 2040 icmp6 = (struct icmp6_hdr *)(ip6 + 1); 2041 type = icmp6->icmp6_type; /* keep type for statistics */ 2042 code = icmp6->icmp6_code; /* ditto. */ 2043 2044 t = ip6->ip6_dst; 2045 /* 2046 * ip6_input() drops a packet if its src is multicast. 2047 * So, the src is never multicast. 2048 */ 2049 ip6->ip6_dst = ip6->ip6_src; 2050 2051 /* 2052 * XXX: make sure to embed scope zone information, using 2053 * already embedded IDs or the received interface (if any). 2054 * Note that rcvif may be NULL. 2055 * TODO: scoped routing case (XXX). 2056 */ 2057 bzero(&sa6_src, sizeof(sa6_src)); 2058 sa6_src.sin6_family = AF_INET6; 2059 sa6_src.sin6_len = sizeof(sa6_src); 2060 sa6_src.sin6_addr = ip6->ip6_dst; 2061 in6_recoverscope(&sa6_src, &ip6->ip6_dst, m->m_pkthdr.rcvif); 2062 in6_embedscope(&sa6_src.sin6_addr, &sa6_src, NULL, NULL); 2063 ip6->ip6_dst = sa6_src.sin6_addr; 2064 2065 bzero(&sa6_dst, sizeof(sa6_dst)); 2066 sa6_dst.sin6_family = AF_INET6; 2067 sa6_dst.sin6_len = sizeof(sa6_dst); 2068 sa6_dst.sin6_addr = t; 2069 in6_recoverscope(&sa6_dst, &t, m->m_pkthdr.rcvif); 2070 in6_embedscope(&t, &sa6_dst, NULL, NULL); 2071 2072 /* 2073 * If the incoming packet was addressed directly to us (i.e. unicast), 2074 * use dst as the src for the reply. 2075 * The IN6_IFF_NOTREADY case would be VERY rare, but is possible 2076 * (for example) when we encounter an error while forwarding procedure 2077 * destined to a duplicated address of ours. 2078 */ 2079 for (ia = in6_ifaddr; ia; ia = ia->ia_next) 2080 if (IN6_ARE_ADDR_EQUAL(&t, &ia->ia_addr.sin6_addr) && 2081 (ia->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) { 2082 src = &t; 2083 break; 2084 } 2085 if (ia == NULL && IN6_IS_ADDR_LINKLOCAL(&t) && (m->m_flags & M_LOOP)) { 2086 /* 2087 * This is the case if the dst is our link-local address 2088 * and the sender is also ourselves. 2089 */ 2090 src = &t; 2091 } 2092 2093 if (src == 0) { 2094 int e; 2095 struct route_in6 ro; 2096 2097 /* 2098 * This case matches to multicasts, our anycast, or unicasts 2099 * that we do not own. Select a source address based on the 2100 * source address of the erroneous packet. 2101 */ 2102 bzero(&ro, sizeof(ro)); 2103 src = in6_selectsrc(&sa6_src, NULL, NULL, &ro, NULL, &e); 2104 if (ro.ro_rt) { /* XXX: see comments in icmp6_mtudisc_update */ 2105 RTFREE(ro.ro_rt); /* XXX: we could use this */ 2106 } 2107 if (src == NULL) { 2108 nd6log((LOG_DEBUG, 2109 "icmp6_reflect: source can't be determined: " 2110 "dst=%s, error=%d\n", 2111 ip6_sprintf(&sa6_src.sin6_addr), e)); 2112 goto bad; 2113 } 2114 } 2115 2116 ip6->ip6_src = *src; 2117 2118 ip6->ip6_flow = 0; 2119 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2120 ip6->ip6_vfc |= IPV6_VERSION; 2121 ip6->ip6_nxt = IPPROTO_ICMPV6; 2122 if (m->m_pkthdr.rcvif) { 2123 /* XXX: This may not be the outgoing interface */ 2124 ip6->ip6_hlim = ND_IFINFO(m->m_pkthdr.rcvif)->chlim; 2125 } else 2126 ip6->ip6_hlim = ip6_defhlim; 2127 2128 icmp6->icmp6_cksum = 0; 2129 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6, 2130 sizeof(struct ip6_hdr), plen); 2131 2132 /* 2133 * XXX option handling 2134 */ 2135 2136 m->m_flags &= ~(M_BCAST|M_MCAST); 2137 2138 /* 2139 * To avoid a "too big" situation at an intermediate router 2140 * and the path MTU discovery process, specify the IPV6_MINMTU flag. 2141 * Note that only echo and node information replies are affected, 2142 * since the length of ICMP6 errors is limited to the minimum MTU. 2143 */ 2144 if (ip6_output(m, NULL, NULL, IPV6_MINMTU, 2145 (struct ip6_moptions *)NULL, (struct socket *)NULL, &outif) != 0 2146 && outif) 2147 icmp6_ifstat_inc(outif, ifs6_out_error); 2148 2149 if (outif) 2150 icmp6_ifoutstat_inc(outif, type, code); 2151 2152 return; 2153 2154 bad: 2155 m_freem(m); 2156 return; 2157 } 2158 2159 void 2160 icmp6_fasttimo() 2161 { 2162 2163 mld6_fasttimeo(); 2164 } 2165 2166 static const char * 2167 icmp6_redirect_diag(src6, dst6, tgt6) 2168 struct in6_addr *src6; 2169 struct in6_addr *dst6; 2170 struct in6_addr *tgt6; 2171 { 2172 static char buf[1024]; 2173 snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)", 2174 ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6)); 2175 return buf; 2176 } 2177 2178 void 2179 icmp6_redirect_input(m, off) 2180 struct mbuf *m; 2181 int off; 2182 { 2183 struct ifnet *ifp = m->m_pkthdr.rcvif; 2184 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 2185 struct nd_redirect *nd_rd; 2186 int icmp6len = ntohs(ip6->ip6_plen); 2187 char *lladdr = NULL; 2188 int lladdrlen = 0; 2189 struct rtentry *rt = NULL; 2190 int is_router; 2191 int is_onlink; 2192 struct in6_addr src6 = ip6->ip6_src; 2193 struct in6_addr redtgt6; 2194 struct in6_addr reddst6; 2195 union nd_opts ndopts; 2196 2197 if (!ifp) 2198 return; 2199 2200 /* XXX if we are router, we don't update route by icmp6 redirect */ 2201 if (ip6_forwarding) 2202 goto freeit; 2203 if (!icmp6_rediraccept) 2204 goto freeit; 2205 2206 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len); 2207 if (nd_rd == NULL) { 2208 icmp6stat.icp6s_tooshort++; 2209 return; 2210 } 2211 redtgt6 = nd_rd->nd_rd_target; 2212 reddst6 = nd_rd->nd_rd_dst; 2213 2214 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 2215 redtgt6.s6_addr16[1] = htons(ifp->if_index); 2216 if (IN6_IS_ADDR_LINKLOCAL(&reddst6)) 2217 reddst6.s6_addr16[1] = htons(ifp->if_index); 2218 2219 /* validation */ 2220 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) { 2221 nd6log((LOG_ERR, 2222 "ICMP6 redirect sent from %s rejected; " 2223 "must be from linklocal\n", ip6_sprintf(&src6))); 2224 goto bad; 2225 } 2226 if (ip6->ip6_hlim != 255) { 2227 nd6log((LOG_ERR, 2228 "ICMP6 redirect sent from %s rejected; " 2229 "hlim=%d (must be 255)\n", 2230 ip6_sprintf(&src6), ip6->ip6_hlim)); 2231 goto bad; 2232 } 2233 { 2234 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */ 2235 struct sockaddr_in6 sin6; 2236 struct in6_addr *gw6; 2237 2238 bzero(&sin6, sizeof(sin6)); 2239 sin6.sin6_family = AF_INET6; 2240 sin6.sin6_len = sizeof(struct sockaddr_in6); 2241 bcopy(&reddst6, &sin6.sin6_addr, sizeof(reddst6)); 2242 rt = rtalloc1((struct sockaddr *)&sin6, 0); 2243 if (rt) { 2244 if (rt->rt_gateway == NULL || 2245 rt->rt_gateway->sa_family != AF_INET6) { 2246 nd6log((LOG_ERR, 2247 "ICMP6 redirect rejected; no route " 2248 "with inet6 gateway found for redirect dst: %s\n", 2249 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2250 RTFREE(rt); 2251 goto bad; 2252 } 2253 2254 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr); 2255 if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) { 2256 nd6log((LOG_ERR, 2257 "ICMP6 redirect rejected; " 2258 "not equal to gw-for-src=%s (must be same): " 2259 "%s\n", 2260 ip6_sprintf(gw6), 2261 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2262 RTFREE(rt); 2263 goto bad; 2264 } 2265 } else { 2266 nd6log((LOG_ERR, 2267 "ICMP6 redirect rejected; " 2268 "no route found for redirect dst: %s\n", 2269 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2270 goto bad; 2271 } 2272 RTFREE(rt); 2273 rt = NULL; 2274 } 2275 if (IN6_IS_ADDR_MULTICAST(&reddst6)) { 2276 nd6log((LOG_ERR, 2277 "ICMP6 redirect rejected; " 2278 "redirect dst must be unicast: %s\n", 2279 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2280 goto bad; 2281 } 2282 2283 is_router = is_onlink = 0; 2284 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 2285 is_router = 1; /* router case */ 2286 if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0) 2287 is_onlink = 1; /* on-link destination case */ 2288 if (!is_router && !is_onlink) { 2289 nd6log((LOG_ERR, 2290 "ICMP6 redirect rejected; " 2291 "neither router case nor onlink case: %s\n", 2292 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2293 goto bad; 2294 } 2295 /* validation passed */ 2296 2297 icmp6len -= sizeof(*nd_rd); 2298 nd6_option_init(nd_rd + 1, icmp6len, &ndopts); 2299 if (nd6_options(&ndopts) < 0) { 2300 nd6log((LOG_INFO, "icmp6_redirect_input: " 2301 "invalid ND option, rejected: %s\n", 2302 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2303 /* nd6_options have incremented stats */ 2304 goto freeit; 2305 } 2306 2307 if (ndopts.nd_opts_tgt_lladdr) { 2308 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 2309 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 2310 } 2311 2312 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 2313 nd6log((LOG_INFO, 2314 "icmp6_redirect_input: lladdrlen mismatch for %s " 2315 "(if %d, icmp6 packet %d): %s\n", 2316 ip6_sprintf(&redtgt6), ifp->if_addrlen, lladdrlen - 2, 2317 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2318 goto bad; 2319 } 2320 2321 /* RFC 2461 8.3 */ 2322 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT, 2323 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER); 2324 2325 if (!is_onlink) { /* better router case. perform rtredirect. */ 2326 /* perform rtredirect */ 2327 struct sockaddr_in6 sdst; 2328 struct sockaddr_in6 sgw; 2329 struct sockaddr_in6 ssrc; 2330 unsigned long rtcount; 2331 struct rtentry *newrt = NULL; 2332 2333 /* 2334 * do not install redirect route, if the number of entries 2335 * is too much (> hiwat). note that, the node (= host) will 2336 * work just fine even if we do not install redirect route 2337 * (there will be additional hops, though). 2338 */ 2339 rtcount = rt_timer_count(icmp6_redirect_timeout_q); 2340 if (0 <= icmp6_redirect_hiwat && rtcount > icmp6_redirect_hiwat) 2341 return; 2342 else if (0 <= icmp6_redirect_lowat && 2343 rtcount > icmp6_redirect_lowat) { 2344 /* 2345 * XXX nuke a victim, install the new one. 2346 */ 2347 } 2348 2349 bzero(&sdst, sizeof(sdst)); 2350 bzero(&sgw, sizeof(sgw)); 2351 bzero(&ssrc, sizeof(ssrc)); 2352 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6; 2353 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len = 2354 sizeof(struct sockaddr_in6); 2355 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr)); 2356 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2357 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr)); 2358 rtredirect((struct sockaddr *)&sdst, (struct sockaddr *)&sgw, 2359 (struct sockaddr *)NULL, RTF_GATEWAY | RTF_HOST, 2360 (struct sockaddr *)&ssrc, 2361 &newrt); 2362 2363 if (newrt) { 2364 (void)rt_timer_add(newrt, icmp6_redirect_timeout, 2365 icmp6_redirect_timeout_q); 2366 rtfree(newrt); 2367 } 2368 } 2369 /* finally update cached route in each socket via pfctlinput */ 2370 { 2371 struct sockaddr_in6 sdst; 2372 2373 bzero(&sdst, sizeof(sdst)); 2374 sdst.sin6_family = AF_INET6; 2375 sdst.sin6_len = sizeof(struct sockaddr_in6); 2376 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2377 pfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst); 2378 #ifdef IPSEC 2379 key_sa_routechange((struct sockaddr *)&sdst); 2380 #endif 2381 } 2382 2383 freeit: 2384 m_freem(m); 2385 return; 2386 2387 bad: 2388 icmp6stat.icp6s_badredirect++; 2389 m_freem(m); 2390 } 2391 2392 void 2393 icmp6_redirect_output(m0, rt) 2394 struct mbuf *m0; 2395 struct rtentry *rt; 2396 { 2397 struct ifnet *ifp; /* my outgoing interface */ 2398 struct in6_addr *ifp_ll6; 2399 struct in6_addr *nexthop; 2400 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */ 2401 struct mbuf *m = NULL; /* newly allocated one */ 2402 struct ip6_hdr *ip6; /* m as struct ip6_hdr */ 2403 struct nd_redirect *nd_rd; 2404 size_t maxlen; 2405 u_char *p; 2406 struct sockaddr_in6 src_sa; 2407 2408 icmp6_errcount(&icmp6stat.icp6s_outerrhist, ND_REDIRECT, 0); 2409 2410 /* if we are not router, we don't send icmp6 redirect */ 2411 if (!ip6_forwarding) 2412 goto fail; 2413 2414 /* sanity check */ 2415 if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp)) 2416 goto fail; 2417 2418 /* 2419 * Address check: 2420 * the source address must identify a neighbor, and 2421 * the destination address must not be a multicast address 2422 * [RFC 2461, sec 8.2] 2423 */ 2424 sip6 = mtod(m0, struct ip6_hdr *); 2425 bzero(&src_sa, sizeof(src_sa)); 2426 src_sa.sin6_family = AF_INET6; 2427 src_sa.sin6_len = sizeof(src_sa); 2428 src_sa.sin6_addr = sip6->ip6_src; 2429 /* we don't currently use sin6_scope_id, but eventually use it */ 2430 src_sa.sin6_scope_id = in6_addr2scopeid(ifp, &sip6->ip6_src); 2431 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0) 2432 goto fail; 2433 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst)) 2434 goto fail; /* what should we do here? */ 2435 2436 /* rate limit */ 2437 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0)) 2438 goto fail; 2439 2440 /* 2441 * Since we are going to append up to 1280 bytes (= IPV6_MMTU), 2442 * we almost always ask for an mbuf cluster for simplicity. 2443 * (MHLEN < IPV6_MMTU is almost always true) 2444 */ 2445 #if IPV6_MMTU >= MCLBYTES 2446 # error assumption failed about IPV6_MMTU and MCLBYTES 2447 #endif 2448 MGETHDR(m, M_DONTWAIT, MT_HEADER); 2449 if (m && IPV6_MMTU >= MHLEN) 2450 MCLGET(m, M_DONTWAIT); 2451 if (!m) 2452 goto fail; 2453 m->m_pkthdr.rcvif = NULL; 2454 m->m_len = 0; 2455 maxlen = M_TRAILINGSPACE(m); 2456 maxlen = min(IPV6_MMTU, maxlen); 2457 /* just for safety */ 2458 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) + 2459 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) { 2460 goto fail; 2461 } 2462 2463 { 2464 /* get ip6 linklocal address for ifp(my outgoing interface). */ 2465 struct in6_ifaddr *ia; 2466 if ((ia = in6ifa_ifpforlinklocal(ifp, 2467 IN6_IFF_NOTREADY| 2468 IN6_IFF_ANYCAST)) == NULL) 2469 goto fail; 2470 ifp_ll6 = &ia->ia_addr.sin6_addr; 2471 } 2472 2473 /* get ip6 linklocal address for the router. */ 2474 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) { 2475 struct sockaddr_in6 *sin6; 2476 sin6 = (struct sockaddr_in6 *)rt->rt_gateway; 2477 nexthop = &sin6->sin6_addr; 2478 if (!IN6_IS_ADDR_LINKLOCAL(nexthop)) 2479 nexthop = NULL; 2480 } else 2481 nexthop = NULL; 2482 2483 /* ip6 */ 2484 ip6 = mtod(m, struct ip6_hdr *); 2485 ip6->ip6_flow = 0; 2486 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2487 ip6->ip6_vfc |= IPV6_VERSION; 2488 /* ip6->ip6_plen will be set later */ 2489 ip6->ip6_nxt = IPPROTO_ICMPV6; 2490 ip6->ip6_hlim = 255; 2491 /* ip6->ip6_src must be linklocal addr for my outgoing if. */ 2492 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr)); 2493 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr)); 2494 2495 /* ND Redirect */ 2496 nd_rd = (struct nd_redirect *)(ip6 + 1); 2497 nd_rd->nd_rd_type = ND_REDIRECT; 2498 nd_rd->nd_rd_code = 0; 2499 nd_rd->nd_rd_reserved = 0; 2500 if (rt->rt_flags & RTF_GATEWAY) { 2501 /* 2502 * nd_rd->nd_rd_target must be a link-local address in 2503 * better router cases. 2504 */ 2505 if (!nexthop) 2506 goto fail; 2507 bcopy(nexthop, &nd_rd->nd_rd_target, 2508 sizeof(nd_rd->nd_rd_target)); 2509 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2510 sizeof(nd_rd->nd_rd_dst)); 2511 } else { 2512 /* make sure redtgt == reddst */ 2513 nexthop = &sip6->ip6_dst; 2514 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target, 2515 sizeof(nd_rd->nd_rd_target)); 2516 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2517 sizeof(nd_rd->nd_rd_dst)); 2518 } 2519 2520 p = (u_char *)(nd_rd + 1); 2521 2522 { 2523 /* target lladdr option */ 2524 struct rtentry *rt_nexthop = NULL; 2525 int len; 2526 struct sockaddr_dl *sdl; 2527 struct nd_opt_hdr *nd_opt; 2528 char *lladdr; 2529 2530 rt_nexthop = nd6_lookup(nexthop, 0, ifp); 2531 if (!rt_nexthop) 2532 goto nolladdropt; 2533 len = sizeof(*nd_opt) + ifp->if_addrlen; 2534 len = (len + 7) & ~7; /* round by 8 */ 2535 /* safety check */ 2536 if (len + (p - (u_char *)ip6) > maxlen) 2537 goto nolladdropt; 2538 if (!(rt_nexthop->rt_flags & RTF_GATEWAY) && 2539 (rt_nexthop->rt_flags & RTF_LLINFO) && 2540 (rt_nexthop->rt_gateway->sa_family == AF_LINK) && 2541 (sdl = (struct sockaddr_dl *)rt_nexthop->rt_gateway) && 2542 sdl->sdl_alen) { 2543 nd_opt = (struct nd_opt_hdr *)p; 2544 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 2545 nd_opt->nd_opt_len = len >> 3; 2546 lladdr = (char *)(nd_opt + 1); 2547 bcopy(LLADDR(sdl), lladdr, ifp->if_addrlen); 2548 p += len; 2549 } 2550 } 2551 nolladdropt:; 2552 2553 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2554 2555 /* just to be safe */ 2556 if (m0->m_flags & M_DECRYPTED) 2557 goto noredhdropt; 2558 if (p - (u_char *)ip6 > maxlen) 2559 goto noredhdropt; 2560 2561 { 2562 /* redirected header option */ 2563 int len; 2564 struct nd_opt_rd_hdr *nd_opt_rh; 2565 2566 /* 2567 * compute the maximum size for icmp6 redirect header option. 2568 * XXX room for auth header? 2569 */ 2570 len = maxlen - (p - (u_char *)ip6); 2571 len &= ~7; 2572 2573 /* 2574 * Redirected header option spec (RFC2461 4.6.3) talks nothing 2575 * about padding/truncate rule for the original IP packet. 2576 * From the discussion on IPv6imp in Feb 1999, 2577 * the consensus was: 2578 * - "attach as much as possible" is the goal 2579 * - pad if not aligned (original size can be guessed by 2580 * original ip6 header) 2581 * Following code adds the padding if it is simple enough, 2582 * and truncates if not. 2583 */ 2584 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) { 2585 /* not enough room, truncate */ 2586 m_adj(m0, (len - sizeof(*nd_opt_rh)) - 2587 m0->m_pkthdr.len); 2588 } else { 2589 /* 2590 * enough room, truncate if not aligned. 2591 * we don't pad here for simplicity. 2592 */ 2593 size_t extra; 2594 2595 extra = m0->m_pkthdr.len % 8; 2596 if (extra) { 2597 /* truncate */ 2598 m_adj(m0, -extra); 2599 } 2600 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh); 2601 } 2602 2603 nd_opt_rh = (struct nd_opt_rd_hdr *)p; 2604 bzero(nd_opt_rh, sizeof(*nd_opt_rh)); 2605 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER; 2606 nd_opt_rh->nd_opt_rh_len = len >> 3; 2607 p += sizeof(*nd_opt_rh); 2608 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2609 2610 /* connect m0 to m */ 2611 m->m_pkthdr.len += m0->m_pkthdr.len; 2612 m_cat(m, m0); 2613 m0 = NULL; 2614 } 2615 noredhdropt: 2616 if (m0) { 2617 m_freem(m0); 2618 m0 = NULL; 2619 } 2620 2621 if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_src)) 2622 sip6->ip6_src.s6_addr16[1] = 0; 2623 if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_dst)) 2624 sip6->ip6_dst.s6_addr16[1] = 0; 2625 #if 0 2626 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src)) 2627 ip6->ip6_src.s6_addr16[1] = 0; 2628 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) 2629 ip6->ip6_dst.s6_addr16[1] = 0; 2630 #endif 2631 if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_target)) 2632 nd_rd->nd_rd_target.s6_addr16[1] = 0; 2633 if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_dst)) 2634 nd_rd->nd_rd_dst.s6_addr16[1] = 0; 2635 2636 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 2637 2638 nd_rd->nd_rd_cksum = 0; 2639 nd_rd->nd_rd_cksum 2640 = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen)); 2641 2642 /* send the packet to outside... */ 2643 if (ip6_output(m, NULL, NULL, 0, 2644 (struct ip6_moptions *)NULL, (struct socket *)NULL, NULL) != 0) 2645 icmp6_ifstat_inc(ifp, ifs6_out_error); 2646 2647 icmp6_ifstat_inc(ifp, ifs6_out_msg); 2648 icmp6_ifstat_inc(ifp, ifs6_out_redirect); 2649 icmp6stat.icp6s_outhist[ND_REDIRECT]++; 2650 2651 return; 2652 2653 fail: 2654 if (m) 2655 m_freem(m); 2656 if (m0) 2657 m_freem(m0); 2658 } 2659 2660 /* 2661 * ICMPv6 socket option processing. 2662 */ 2663 int 2664 icmp6_ctloutput(op, so, level, optname, mp) 2665 int op; 2666 struct socket *so; 2667 int level, optname; 2668 struct mbuf **mp; 2669 { 2670 int error = 0; 2671 int optlen; 2672 struct in6pcb *in6p = sotoin6pcb(so); 2673 struct mbuf *m = *mp; 2674 2675 optlen = m ? m->m_len : 0; 2676 2677 if (level != IPPROTO_ICMPV6) { 2678 if (op == PRCO_SETOPT && m) 2679 (void)m_free(m); 2680 return EINVAL; 2681 } 2682 2683 switch (op) { 2684 case PRCO_SETOPT: 2685 switch (optname) { 2686 case ICMP6_FILTER: 2687 { 2688 struct icmp6_filter *p; 2689 2690 if (optlen != sizeof(*p)) { 2691 error = EMSGSIZE; 2692 break; 2693 } 2694 p = mtod(m, struct icmp6_filter *); 2695 if (!p || !in6p->in6p_icmp6filt) { 2696 error = EINVAL; 2697 break; 2698 } 2699 bcopy(p, in6p->in6p_icmp6filt, 2700 sizeof(struct icmp6_filter)); 2701 error = 0; 2702 break; 2703 } 2704 2705 default: 2706 error = ENOPROTOOPT; 2707 break; 2708 } 2709 if (m) 2710 (void)m_freem(m); 2711 break; 2712 2713 case PRCO_GETOPT: 2714 switch (optname) { 2715 case ICMP6_FILTER: 2716 { 2717 struct icmp6_filter *p; 2718 2719 if (!in6p->in6p_icmp6filt) { 2720 error = EINVAL; 2721 break; 2722 } 2723 *mp = m = m_get(M_WAIT, MT_SOOPTS); 2724 m->m_len = sizeof(struct icmp6_filter); 2725 p = mtod(m, struct icmp6_filter *); 2726 bcopy(in6p->in6p_icmp6filt, p, 2727 sizeof(struct icmp6_filter)); 2728 error = 0; 2729 break; 2730 } 2731 2732 default: 2733 error = ENOPROTOOPT; 2734 break; 2735 } 2736 break; 2737 } 2738 2739 return (error); 2740 } 2741 2742 /* 2743 * Perform rate limit check. 2744 * Returns 0 if it is okay to send the icmp6 packet. 2745 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate 2746 * limitation. 2747 * 2748 * XXX per-destination/type check necessary? 2749 */ 2750 static int 2751 icmp6_ratelimit(dst, type, code) 2752 const struct in6_addr *dst; /* not used at this moment */ 2753 const int type; /* not used at this moment */ 2754 const int code; /* not used at this moment */ 2755 { 2756 int ret; 2757 2758 ret = 0; /* okay to send */ 2759 2760 /* PPS limit */ 2761 if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count, 2762 icmp6errppslim)) { 2763 /* The packet is subject to rate limit */ 2764 ret++; 2765 } 2766 2767 return ret; 2768 } 2769 2770 static struct rtentry * 2771 icmp6_mtudisc_clone(dst) 2772 struct sockaddr *dst; 2773 { 2774 struct rtentry *rt; 2775 int error; 2776 2777 rt = rtalloc1(dst, 1); 2778 if (rt == 0) 2779 return NULL; 2780 2781 /* If we didn't get a host route, allocate one */ 2782 if ((rt->rt_flags & RTF_HOST) == 0) { 2783 struct rtentry *nrt; 2784 2785 error = rtrequest((int) RTM_ADD, dst, 2786 (struct sockaddr *) rt->rt_gateway, 2787 (struct sockaddr *) 0, 2788 RTF_GATEWAY | RTF_HOST | RTF_DYNAMIC, &nrt); 2789 if (error) { 2790 rtfree(rt); 2791 return NULL; 2792 } 2793 nrt->rt_rmx = rt->rt_rmx; 2794 rtfree(rt); 2795 rt = nrt; 2796 } 2797 error = rt_timer_add(rt, icmp6_mtudisc_timeout, 2798 icmp6_mtudisc_timeout_q); 2799 if (error) { 2800 rtfree(rt); 2801 return NULL; 2802 } 2803 2804 return rt; /* caller need to call rtfree() */ 2805 } 2806 2807 static void 2808 icmp6_mtudisc_timeout(rt, r) 2809 struct rtentry *rt; 2810 struct rttimer *r; 2811 { 2812 if (rt == NULL) 2813 panic("icmp6_mtudisc_timeout: bad route to timeout"); 2814 if ((rt->rt_flags & (RTF_DYNAMIC | RTF_HOST)) == 2815 (RTF_DYNAMIC | RTF_HOST)) { 2816 rtrequest((int) RTM_DELETE, (struct sockaddr *)rt_key(rt), 2817 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0); 2818 } else { 2819 if (!(rt->rt_rmx.rmx_locks & RTV_MTU)) 2820 rt->rt_rmx.rmx_mtu = 0; 2821 } 2822 } 2823 2824 static void 2825 icmp6_redirect_timeout(rt, r) 2826 struct rtentry *rt; 2827 struct rttimer *r; 2828 { 2829 if (rt == NULL) 2830 panic("icmp6_redirect_timeout: bad route to timeout"); 2831 if ((rt->rt_flags & (RTF_GATEWAY | RTF_DYNAMIC | RTF_HOST)) == 2832 (RTF_GATEWAY | RTF_DYNAMIC | RTF_HOST)) { 2833 rtrequest((int) RTM_DELETE, (struct sockaddr *)rt_key(rt), 2834 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0); 2835 } 2836 } 2837 2838 /* 2839 * sysctl helper routine for the net.inet6.icmp6.nd6 nodes. silly? 2840 */ 2841 static int 2842 sysctl_net_inet6_icmp6_nd6(SYSCTLFN_ARGS) 2843 { 2844 2845 if (namelen != 0) 2846 return (EINVAL); 2847 2848 return (nd6_sysctl(rnode->sysctl_num, oldp, oldlenp, 2849 /*XXXUNCONST*/ 2850 __UNCONST(newp), newlen)); 2851 } 2852 2853 SYSCTL_SETUP(sysctl_net_inet6_icmp6_setup, 2854 "sysctl net.inet6.icmp6 subtree setup") 2855 { 2856 2857 sysctl_createv(clog, 0, NULL, NULL, 2858 CTLFLAG_PERMANENT, 2859 CTLTYPE_NODE, "net", NULL, 2860 NULL, 0, NULL, 0, 2861 CTL_NET, CTL_EOL); 2862 sysctl_createv(clog, 0, NULL, NULL, 2863 CTLFLAG_PERMANENT, 2864 CTLTYPE_NODE, "inet6", NULL, 2865 NULL, 0, NULL, 0, 2866 CTL_NET, PF_INET6, CTL_EOL); 2867 sysctl_createv(clog, 0, NULL, NULL, 2868 CTLFLAG_PERMANENT, 2869 CTLTYPE_NODE, "icmp6", 2870 SYSCTL_DESCR("ICMPv6 related settings"), 2871 NULL, 0, NULL, 0, 2872 CTL_NET, PF_INET6, IPPROTO_ICMPV6, CTL_EOL); 2873 2874 sysctl_createv(clog, 0, NULL, NULL, 2875 CTLFLAG_PERMANENT, 2876 CTLTYPE_STRUCT, "stats", 2877 SYSCTL_DESCR("ICMPv6 transmission statistics"), 2878 NULL, 0, &icmp6stat, sizeof(icmp6stat), 2879 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2880 ICMPV6CTL_STATS, CTL_EOL); 2881 sysctl_createv(clog, 0, NULL, NULL, 2882 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2883 CTLTYPE_INT, "rediraccept", 2884 SYSCTL_DESCR("Accept and process redirect messages"), 2885 NULL, 0, &icmp6_rediraccept, 0, 2886 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2887 ICMPV6CTL_REDIRACCEPT, CTL_EOL); 2888 sysctl_createv(clog, 0, NULL, NULL, 2889 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2890 CTLTYPE_INT, "redirtimeout", 2891 SYSCTL_DESCR("Redirect generated route lifetime"), 2892 NULL, 0, &icmp6_redirtimeout, 0, 2893 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2894 ICMPV6CTL_REDIRTIMEOUT, CTL_EOL); 2895 #if 0 /* obsoleted */ 2896 sysctl_createv(clog, 0, NULL, NULL, 2897 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2898 CTLTYPE_INT, "errratelimit", NULL, 2899 NULL, 0, &icmp6_errratelimit, 0, 2900 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2901 ICMPV6CTL_ERRRATELIMIT, CTL_EOL); 2902 #endif 2903 sysctl_createv(clog, 0, NULL, NULL, 2904 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2905 CTLTYPE_INT, "nd6_prune", 2906 SYSCTL_DESCR("Neighbor discovery prune interval"), 2907 NULL, 0, &nd6_prune, 0, 2908 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2909 ICMPV6CTL_ND6_PRUNE, CTL_EOL); 2910 sysctl_createv(clog, 0, NULL, NULL, 2911 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2912 CTLTYPE_INT, "nd6_delay", 2913 SYSCTL_DESCR("First probe delay time"), 2914 NULL, 0, &nd6_delay, 0, 2915 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2916 ICMPV6CTL_ND6_DELAY, CTL_EOL); 2917 sysctl_createv(clog, 0, NULL, NULL, 2918 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2919 CTLTYPE_INT, "nd6_umaxtries", 2920 SYSCTL_DESCR("Number of unicast discovery attempts"), 2921 NULL, 0, &nd6_umaxtries, 0, 2922 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2923 ICMPV6CTL_ND6_UMAXTRIES, CTL_EOL); 2924 sysctl_createv(clog, 0, NULL, NULL, 2925 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2926 CTLTYPE_INT, "nd6_mmaxtries", 2927 SYSCTL_DESCR("Number of multicast discovery attempts"), 2928 NULL, 0, &nd6_mmaxtries, 0, 2929 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2930 ICMPV6CTL_ND6_MMAXTRIES, CTL_EOL); 2931 sysctl_createv(clog, 0, NULL, NULL, 2932 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2933 CTLTYPE_INT, "nd6_useloopback", 2934 SYSCTL_DESCR("Use loopback interface for local traffic"), 2935 NULL, 0, &nd6_useloopback, 0, 2936 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2937 ICMPV6CTL_ND6_USELOOPBACK, CTL_EOL); 2938 #if 0 /* obsoleted */ 2939 sysctl_createv(clog, 0, NULL, NULL, 2940 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2941 CTLTYPE_INT, "nd6_proxyall", NULL, 2942 NULL, 0, &nd6_proxyall, 0, 2943 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2944 ICMPV6CTL_ND6_PROXYALL, CTL_EOL); 2945 #endif 2946 sysctl_createv(clog, 0, NULL, NULL, 2947 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2948 CTLTYPE_INT, "nodeinfo", 2949 SYSCTL_DESCR("Respond to node information requests"), 2950 NULL, 0, &icmp6_nodeinfo, 0, 2951 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2952 ICMPV6CTL_NODEINFO, CTL_EOL); 2953 sysctl_createv(clog, 0, NULL, NULL, 2954 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2955 CTLTYPE_INT, "errppslimit", 2956 SYSCTL_DESCR("Maximum ICMP errors sent per second"), 2957 NULL, 0, &icmp6errppslim, 0, 2958 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2959 ICMPV6CTL_ERRPPSLIMIT, CTL_EOL); 2960 sysctl_createv(clog, 0, NULL, NULL, 2961 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2962 CTLTYPE_INT, "nd6_maxnudhint", 2963 SYSCTL_DESCR("Maximum neighbor unreachable hint count"), 2964 NULL, 0, &nd6_maxnudhint, 0, 2965 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2966 ICMPV6CTL_ND6_MAXNUDHINT, CTL_EOL); 2967 sysctl_createv(clog, 0, NULL, NULL, 2968 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2969 CTLTYPE_INT, "mtudisc_hiwat", 2970 SYSCTL_DESCR("Low mark on MTU Discovery route timers"), 2971 NULL, 0, &icmp6_mtudisc_hiwat, 0, 2972 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2973 ICMPV6CTL_MTUDISC_HIWAT, CTL_EOL); 2974 sysctl_createv(clog, 0, NULL, NULL, 2975 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2976 CTLTYPE_INT, "mtudisc_lowat", 2977 SYSCTL_DESCR("Low mark on MTU Discovery route timers"), 2978 NULL, 0, &icmp6_mtudisc_lowat, 0, 2979 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2980 ICMPV6CTL_MTUDISC_LOWAT, CTL_EOL); 2981 sysctl_createv(clog, 0, NULL, NULL, 2982 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2983 CTLTYPE_INT, "nd6_debug", 2984 SYSCTL_DESCR("Enable neighbor discovery debug output"), 2985 NULL, 0, &nd6_debug, 0, 2986 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2987 ICMPV6CTL_ND6_DEBUG, CTL_EOL); 2988 sysctl_createv(clog, 0, NULL, NULL, 2989 CTLFLAG_PERMANENT, 2990 CTLTYPE_STRUCT, "nd6_drlist", 2991 SYSCTL_DESCR("Default router list"), 2992 sysctl_net_inet6_icmp6_nd6, 0, NULL, 0, 2993 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2994 ICMPV6CTL_ND6_DRLIST, CTL_EOL); 2995 sysctl_createv(clog, 0, NULL, NULL, 2996 CTLFLAG_PERMANENT, 2997 CTLTYPE_STRUCT, "nd6_prlist", 2998 SYSCTL_DESCR("Prefix list"), 2999 sysctl_net_inet6_icmp6_nd6, 0, NULL, 0, 3000 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3001 ICMPV6CTL_ND6_PRLIST, CTL_EOL); 3002 } 3003