1 /* $NetBSD: icmp6.c,v 1.112 2005/12/11 12:25:02 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 1.112 2005/12/11 12:25:02 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_MOVE_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 } else { 624 deliverecho: 625 nip6 = mtod(n, struct ip6_hdr *); 626 nicmp6 = (struct icmp6_hdr *)((caddr_t)nip6 + off); 627 noff = off; 628 } 629 nicmp6->icmp6_type = ICMP6_ECHO_REPLY; 630 nicmp6->icmp6_code = 0; 631 if (n) { 632 icmp6stat.icp6s_reflect++; 633 icmp6stat.icp6s_outhist[ICMP6_ECHO_REPLY]++; 634 icmp6_reflect(n, noff); 635 } 636 if (!m) 637 goto freeit; 638 break; 639 640 case ICMP6_ECHO_REPLY: 641 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echoreply); 642 if (code != 0) 643 goto badcode; 644 break; 645 646 case MLD_LISTENER_QUERY: 647 case MLD_LISTENER_REPORT: 648 if (icmp6len < sizeof(struct mld_hdr)) 649 goto badlen; 650 if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */ 651 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldquery); 652 else 653 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldreport); 654 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 655 /* give up local */ 656 mld6_input(m, off); 657 m = NULL; 658 goto freeit; 659 } 660 mld6_input(n, off); 661 /* m stays. */ 662 break; 663 664 case MLD_LISTENER_DONE: 665 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mlddone); 666 if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */ 667 goto badlen; 668 break; /* nothing to be done in kernel */ 669 670 case MLD_MTRACE_RESP: 671 case MLD_MTRACE: 672 /* XXX: these two are experimental. not officially defined. */ 673 /* XXX: per-interface statistics? */ 674 break; /* just pass it to applications */ 675 676 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */ 677 { 678 enum { WRU, FQDN } mode; 679 680 if (!icmp6_nodeinfo) 681 break; 682 683 if (icmp6len == sizeof(struct icmp6_hdr) + 4) 684 mode = WRU; 685 else if (icmp6len >= sizeof(struct icmp6_nodeinfo)) 686 mode = FQDN; 687 else 688 goto badlen; 689 690 if (mode == FQDN) { 691 n = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 692 if (n) 693 n = ni6_input(n, off); 694 /* XXX meaningless if n == NULL */ 695 noff = sizeof(struct ip6_hdr); 696 } else { 697 u_char *p; 698 int maxlen, maxhlen; 699 700 if ((icmp6_nodeinfo & 5) != 5) 701 break; 702 703 if (code != 0) 704 goto badcode; 705 maxlen = sizeof(*nip6) + sizeof(*nicmp6) + 4; 706 if (maxlen >= MCLBYTES) { 707 /* Give up remote */ 708 break; 709 } 710 MGETHDR(n, M_DONTWAIT, m->m_type); 711 if (n && maxlen > MHLEN) { 712 MCLGET(n, M_DONTWAIT); 713 if ((n->m_flags & M_EXT) == 0) { 714 m_free(n); 715 n = NULL; 716 } 717 } 718 if (n == NULL) { 719 /* Give up remote */ 720 break; 721 } 722 n->m_pkthdr.rcvif = NULL; 723 n->m_len = 0; 724 maxhlen = M_TRAILINGSPACE(n) - maxlen; 725 if (maxhlen > hostnamelen) 726 maxhlen = hostnamelen; 727 /* 728 * Copy IPv6 and ICMPv6 only. 729 */ 730 nip6 = mtod(n, struct ip6_hdr *); 731 bcopy(ip6, nip6, sizeof(struct ip6_hdr)); 732 nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 733 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); 734 p = (u_char *)(nicmp6 + 1); 735 bzero(p, 4); 736 bcopy(hostname, p + 4, maxhlen); /* meaningless TTL */ 737 noff = sizeof(struct ip6_hdr); 738 M_COPY_PKTHDR(n, m); /* just for rcvif */ 739 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 740 sizeof(struct icmp6_hdr) + 4 + maxhlen; 741 nicmp6->icmp6_type = ICMP6_WRUREPLY; 742 nicmp6->icmp6_code = 0; 743 } 744 #undef hostnamelen 745 if (n) { 746 icmp6stat.icp6s_reflect++; 747 icmp6stat.icp6s_outhist[ICMP6_WRUREPLY]++; 748 icmp6_reflect(n, noff); 749 } 750 break; 751 } 752 753 case ICMP6_WRUREPLY: 754 if (code != 0) 755 goto badcode; 756 break; 757 758 case ND_ROUTER_SOLICIT: 759 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routersolicit); 760 if (code != 0) 761 goto badcode; 762 if (icmp6len < sizeof(struct nd_router_solicit)) 763 goto badlen; 764 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 765 /* give up local */ 766 nd6_rs_input(m, off, icmp6len); 767 m = NULL; 768 goto freeit; 769 } 770 nd6_rs_input(n, off, icmp6len); 771 /* m stays. */ 772 break; 773 774 case ND_ROUTER_ADVERT: 775 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routeradvert); 776 if (code != 0) 777 goto badcode; 778 if (icmp6len < sizeof(struct nd_router_advert)) 779 goto badlen; 780 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 781 /* give up local */ 782 nd6_ra_input(m, off, icmp6len); 783 m = NULL; 784 goto freeit; 785 } 786 nd6_ra_input(n, off, icmp6len); 787 /* m stays. */ 788 break; 789 790 case ND_NEIGHBOR_SOLICIT: 791 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighborsolicit); 792 if (code != 0) 793 goto badcode; 794 if (icmp6len < sizeof(struct nd_neighbor_solicit)) 795 goto badlen; 796 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 797 /* give up local */ 798 nd6_ns_input(m, off, icmp6len); 799 m = NULL; 800 goto freeit; 801 } 802 nd6_ns_input(n, off, icmp6len); 803 /* m stays. */ 804 break; 805 806 case ND_NEIGHBOR_ADVERT: 807 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighboradvert); 808 if (code != 0) 809 goto badcode; 810 if (icmp6len < sizeof(struct nd_neighbor_advert)) 811 goto badlen; 812 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 813 /* give up local */ 814 nd6_na_input(m, off, icmp6len); 815 m = NULL; 816 goto freeit; 817 } 818 nd6_na_input(n, off, icmp6len); 819 /* m stays. */ 820 break; 821 822 case ND_REDIRECT: 823 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_redirect); 824 if (code != 0) 825 goto badcode; 826 if (icmp6len < sizeof(struct nd_redirect)) 827 goto badlen; 828 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 829 /* give up local */ 830 icmp6_redirect_input(m, off); 831 m = NULL; 832 goto freeit; 833 } 834 icmp6_redirect_input(n, off); 835 /* m stays. */ 836 break; 837 838 case ICMP6_ROUTER_RENUMBERING: 839 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND && 840 code != ICMP6_ROUTER_RENUMBERING_RESULT) 841 goto badcode; 842 if (icmp6len < sizeof(struct icmp6_router_renum)) 843 goto badlen; 844 break; 845 846 default: 847 nd6log((LOG_DEBUG, 848 "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n", 849 icmp6->icmp6_type, ip6_sprintf(&ip6->ip6_src), 850 ip6_sprintf(&ip6->ip6_dst), 851 m->m_pkthdr.rcvif ? m->m_pkthdr.rcvif->if_index : 0)); 852 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) { 853 /* ICMPv6 error: MUST deliver it by spec... */ 854 code = PRC_NCMDS; 855 /* deliver */ 856 } else { 857 /* ICMPv6 informational: MUST not deliver */ 858 break; 859 } 860 deliver: 861 if (icmp6_notify_error(m, off, icmp6len, code)) { 862 /* In this case, m should've been freed. */ 863 return (IPPROTO_DONE); 864 } 865 break; 866 867 badcode: 868 icmp6stat.icp6s_badcode++; 869 break; 870 871 badlen: 872 icmp6stat.icp6s_badlen++; 873 break; 874 } 875 876 /* deliver the packet to appropriate sockets */ 877 icmp6_rip6_input(&m, *offp); 878 879 return IPPROTO_DONE; 880 881 freeit: 882 m_freem(m); 883 return IPPROTO_DONE; 884 } 885 886 static int 887 icmp6_notify_error(m, off, icmp6len, code) 888 struct mbuf *m; 889 int off, icmp6len; 890 { 891 struct icmp6_hdr *icmp6; 892 struct ip6_hdr *eip6; 893 u_int32_t notifymtu; 894 struct sockaddr_in6 icmp6src, icmp6dst; 895 896 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) { 897 icmp6stat.icp6s_tooshort++; 898 goto freeit; 899 } 900 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 901 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 902 if (icmp6 == NULL) { 903 icmp6stat.icp6s_tooshort++; 904 return (-1); 905 } 906 eip6 = (struct ip6_hdr *)(icmp6 + 1); 907 908 /* Detect the upper level protocol */ 909 { 910 void (*ctlfunc) __P((int, struct sockaddr *, void *)); 911 u_int8_t nxt = eip6->ip6_nxt; 912 int eoff = off + sizeof(struct icmp6_hdr) + 913 sizeof(struct ip6_hdr); 914 struct ip6ctlparam ip6cp; 915 struct in6_addr *finaldst = NULL; 916 int icmp6type = icmp6->icmp6_type; 917 struct ip6_frag *fh; 918 struct ip6_rthdr *rth; 919 struct ip6_rthdr0 *rth0; 920 int rthlen; 921 922 while (1) { /* XXX: should avoid infinite loop explicitly? */ 923 struct ip6_ext *eh; 924 925 switch (nxt) { 926 case IPPROTO_HOPOPTS: 927 case IPPROTO_DSTOPTS: 928 case IPPROTO_AH: 929 IP6_EXTHDR_GET(eh, struct ip6_ext *, m, 930 eoff, sizeof(*eh)); 931 if (eh == NULL) { 932 icmp6stat.icp6s_tooshort++; 933 return (-1); 934 } 935 936 if (nxt == IPPROTO_AH) 937 eoff += (eh->ip6e_len + 2) << 2; 938 else 939 eoff += (eh->ip6e_len + 1) << 3; 940 nxt = eh->ip6e_nxt; 941 break; 942 case IPPROTO_ROUTING: 943 /* 944 * When the erroneous packet contains a 945 * routing header, we should examine the 946 * header to determine the final destination. 947 * Otherwise, we can't properly update 948 * information that depends on the final 949 * destination (e.g. path MTU). 950 */ 951 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m, 952 eoff, sizeof(*rth)); 953 if (rth == NULL) { 954 icmp6stat.icp6s_tooshort++; 955 return (-1); 956 } 957 rthlen = (rth->ip6r_len + 1) << 3; 958 /* 959 * XXX: currently there is no 960 * officially defined type other 961 * than type-0. 962 * Note that if the segment left field 963 * is 0, all intermediate hops must 964 * have been passed. 965 */ 966 if (rth->ip6r_segleft && 967 rth->ip6r_type == IPV6_RTHDR_TYPE_0) { 968 int hops; 969 970 IP6_EXTHDR_GET(rth0, 971 struct ip6_rthdr0 *, m, 972 eoff, rthlen); 973 if (rth0 == NULL) { 974 icmp6stat.icp6s_tooshort++; 975 return (-1); 976 } 977 /* just ignore a bogus header */ 978 if ((rth0->ip6r0_len % 2) == 0 && 979 (hops = rth0->ip6r0_len/2)) 980 finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1); 981 } 982 eoff += rthlen; 983 nxt = rth->ip6r_nxt; 984 break; 985 case IPPROTO_FRAGMENT: 986 IP6_EXTHDR_GET(fh, struct ip6_frag *, m, 987 eoff, sizeof(*fh)); 988 if (fh == NULL) { 989 icmp6stat.icp6s_tooshort++; 990 return (-1); 991 } 992 /* 993 * Data after a fragment header is meaningless 994 * unless it is the first fragment, but 995 * we'll go to the notify label for path MTU 996 * discovery. 997 */ 998 if (fh->ip6f_offlg & IP6F_OFF_MASK) 999 goto notify; 1000 1001 eoff += sizeof(struct ip6_frag); 1002 nxt = fh->ip6f_nxt; 1003 break; 1004 default: 1005 /* 1006 * This case includes ESP and the No Next 1007 * Header. In such cases going to the notify 1008 * label does not have any meaning 1009 * (i.e. ctlfunc will be NULL), but we go 1010 * anyway since we might have to update 1011 * path MTU information. 1012 */ 1013 goto notify; 1014 } 1015 } 1016 notify: 1017 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 1018 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 1019 if (icmp6 == NULL) { 1020 icmp6stat.icp6s_tooshort++; 1021 return (-1); 1022 } 1023 1024 eip6 = (struct ip6_hdr *)(icmp6 + 1); 1025 bzero(&icmp6dst, sizeof(icmp6dst)); 1026 icmp6dst.sin6_len = sizeof(struct sockaddr_in6); 1027 icmp6dst.sin6_family = AF_INET6; 1028 if (finaldst == NULL) 1029 icmp6dst.sin6_addr = eip6->ip6_dst; 1030 else 1031 icmp6dst.sin6_addr = *finaldst; 1032 icmp6dst.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif, 1033 &icmp6dst.sin6_addr); 1034 #ifndef SCOPEDROUTING 1035 if (in6_embedscope(&icmp6dst.sin6_addr, &icmp6dst, 1036 NULL, NULL)) { 1037 /* should be impossbile */ 1038 nd6log((LOG_DEBUG, 1039 "icmp6_notify_error: in6_embedscope failed\n")); 1040 goto freeit; 1041 } 1042 #endif 1043 1044 /* 1045 * retrieve parameters from the inner IPv6 header, and convert 1046 * them into sockaddr structures. 1047 */ 1048 bzero(&icmp6src, sizeof(icmp6src)); 1049 icmp6src.sin6_len = sizeof(struct sockaddr_in6); 1050 icmp6src.sin6_family = AF_INET6; 1051 icmp6src.sin6_addr = eip6->ip6_src; 1052 icmp6src.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif, 1053 &icmp6src.sin6_addr); 1054 #ifndef SCOPEDROUTING 1055 if (in6_embedscope(&icmp6src.sin6_addr, &icmp6src, 1056 NULL, NULL)) { 1057 /* should be impossbile */ 1058 nd6log((LOG_DEBUG, 1059 "icmp6_notify_error: in6_embedscope failed\n")); 1060 goto freeit; 1061 } 1062 #endif 1063 icmp6src.sin6_flowinfo = 1064 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK); 1065 1066 if (finaldst == NULL) 1067 finaldst = &eip6->ip6_dst; 1068 ip6cp.ip6c_m = m; 1069 ip6cp.ip6c_icmp6 = icmp6; 1070 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1); 1071 ip6cp.ip6c_off = eoff; 1072 ip6cp.ip6c_finaldst = finaldst; 1073 ip6cp.ip6c_src = &icmp6src; 1074 ip6cp.ip6c_nxt = nxt; 1075 1076 if (icmp6type == ICMP6_PACKET_TOO_BIG) { 1077 notifymtu = ntohl(icmp6->icmp6_mtu); 1078 ip6cp.ip6c_cmdarg = (void *)¬ifymtu; 1079 } 1080 1081 ctlfunc = (void (*) __P((int, struct sockaddr *, void *))) 1082 (inet6sw[ip6_protox[nxt]].pr_ctlinput); 1083 if (ctlfunc) { 1084 (void) (*ctlfunc)(code, (struct sockaddr *)&icmp6dst, 1085 &ip6cp); 1086 } 1087 } 1088 return (0); 1089 1090 freeit: 1091 m_freem(m); 1092 return (-1); 1093 } 1094 1095 void 1096 icmp6_mtudisc_update(ip6cp, validated) 1097 struct ip6ctlparam *ip6cp; 1098 int validated; 1099 { 1100 unsigned long rtcount; 1101 struct icmp6_mtudisc_callback *mc; 1102 struct in6_addr *dst = ip6cp->ip6c_finaldst; 1103 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6; 1104 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */ 1105 u_int mtu = ntohl(icmp6->icmp6_mtu); 1106 struct rtentry *rt = NULL; 1107 struct sockaddr_in6 sin6; 1108 1109 /* 1110 * allow non-validated cases if memory is plenty, to make traffic 1111 * from non-connected pcb happy. 1112 */ 1113 rtcount = rt_timer_count(icmp6_mtudisc_timeout_q); 1114 if (validated) { 1115 if (0 <= icmp6_mtudisc_hiwat && rtcount > icmp6_mtudisc_hiwat) 1116 return; 1117 else if (0 <= icmp6_mtudisc_lowat && 1118 rtcount > icmp6_mtudisc_lowat) { 1119 /* 1120 * XXX nuke a victim, install the new one. 1121 */ 1122 } 1123 } else { 1124 if (0 <= icmp6_mtudisc_lowat && rtcount > icmp6_mtudisc_lowat) 1125 return; 1126 } 1127 1128 bzero(&sin6, sizeof(sin6)); 1129 sin6.sin6_family = PF_INET6; 1130 sin6.sin6_len = sizeof(struct sockaddr_in6); 1131 sin6.sin6_addr = *dst; 1132 /* XXX normally, this won't happen */ 1133 if (IN6_IS_ADDR_LINKLOCAL(dst)) { 1134 sin6.sin6_addr.s6_addr16[1] = 1135 htons(m->m_pkthdr.rcvif->if_index); 1136 } 1137 /* sin6.sin6_scope_id = XXX: should be set if DST is a scoped addr */ 1138 rt = icmp6_mtudisc_clone((struct sockaddr *)&sin6); 1139 1140 if (rt && (rt->rt_flags & RTF_HOST) && 1141 !(rt->rt_rmx.rmx_locks & RTV_MTU) && 1142 (rt->rt_rmx.rmx_mtu > mtu || rt->rt_rmx.rmx_mtu == 0)) { 1143 if (mtu < IN6_LINKMTU(rt->rt_ifp)) { 1144 icmp6stat.icp6s_pmtuchg++; 1145 rt->rt_rmx.rmx_mtu = mtu; 1146 } 1147 } 1148 if (rt) { /* XXX: need braces to avoid conflict with else in RTFREE. */ 1149 RTFREE(rt); 1150 } 1151 1152 /* 1153 * Notify protocols that the MTU for this destination 1154 * has changed. 1155 */ 1156 for (mc = LIST_FIRST(&icmp6_mtudisc_callbacks); mc != NULL; 1157 mc = LIST_NEXT(mc, mc_list)) 1158 (*mc->mc_func)(&sin6.sin6_addr); 1159 } 1160 1161 /* 1162 * Process a Node Information Query packet, based on 1163 * draft-ietf-ipngwg-icmp-name-lookups-07. 1164 * 1165 * Spec incompatibilities: 1166 * - IPv6 Subject address handling 1167 * - IPv4 Subject address handling support missing 1168 * - Proxy reply (answer even if it's not for me) 1169 * - joins NI group address at in6_ifattach() time only, does not cope 1170 * with hostname changes by sethostname(3) 1171 */ 1172 #ifndef offsetof /* XXX */ 1173 #define offsetof(type, member) ((size_t)(&((type *)0)->member)) 1174 #endif 1175 static struct mbuf * 1176 ni6_input(m, off) 1177 struct mbuf *m; 1178 int off; 1179 { 1180 struct icmp6_nodeinfo *ni6, *nni6; 1181 struct mbuf *n = NULL; 1182 u_int16_t qtype; 1183 int subjlen; 1184 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1185 struct ni_reply_fqdn *fqdn; 1186 int addrs; /* for NI_QTYPE_NODEADDR */ 1187 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */ 1188 struct sockaddr_in6 sin6; /* double meaning; ip6_dst and subjectaddr */ 1189 struct ip6_hdr *ip6; 1190 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */ 1191 char *subj = NULL; 1192 1193 ip6 = mtod(m, struct ip6_hdr *); 1194 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6)); 1195 if (ni6 == NULL) { 1196 /* m is already reclaimed */ 1197 return NULL; 1198 } 1199 1200 /* 1201 * Validate IPv6 destination address. 1202 * 1203 * The Responder must discard the Query without further processing 1204 * unless it is one of the Responder's unicast or anycast addresses, or 1205 * a link-local scope multicast address which the Responder has joined. 1206 * [icmp-name-lookups-07, Section 4.] 1207 */ 1208 bzero(&sin6, sizeof(sin6)); 1209 sin6.sin6_family = AF_INET6; 1210 sin6.sin6_len = sizeof(struct sockaddr_in6); 1211 bcopy(&ip6->ip6_dst, &sin6.sin6_addr, sizeof(sin6.sin6_addr)); 1212 /* XXX scopeid */ 1213 if (ifa_ifwithaddr((struct sockaddr *)&sin6)) 1214 ; /* unicast/anycast, fine */ 1215 else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr)) 1216 ; /* link-local multicast, fine */ 1217 else 1218 goto bad; 1219 1220 /* validate query Subject field. */ 1221 qtype = ntohs(ni6->ni_qtype); 1222 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo); 1223 switch (qtype) { 1224 case NI_QTYPE_NOOP: 1225 case NI_QTYPE_SUPTYPES: 1226 /* 07 draft */ 1227 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0) 1228 break; 1229 /* FALLTHROUGH */ 1230 case NI_QTYPE_FQDN: 1231 case NI_QTYPE_NODEADDR: 1232 switch (ni6->ni_code) { 1233 case ICMP6_NI_SUBJ_IPV6: 1234 #if ICMP6_NI_SUBJ_IPV6 != 0 1235 case 0: 1236 #endif 1237 /* 1238 * backward compatibility - try to accept 03 draft 1239 * format, where no Subject is present. 1240 */ 1241 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 && 1242 subjlen == 0) { 1243 oldfqdn++; 1244 break; 1245 } 1246 #if ICMP6_NI_SUBJ_IPV6 != 0 1247 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6) 1248 goto bad; 1249 #endif 1250 1251 if (subjlen != sizeof(sin6.sin6_addr)) 1252 goto bad; 1253 1254 /* 1255 * Validate Subject address. 1256 * 1257 * Not sure what exactly "address belongs to the node" 1258 * means in the spec, is it just unicast, or what? 1259 * 1260 * At this moment we consider Subject address as 1261 * "belong to the node" if the Subject address equals 1262 * to the IPv6 destination address; validation for 1263 * IPv6 destination address should have done enough 1264 * check for us. 1265 * 1266 * We do not do proxy at this moment. 1267 */ 1268 /* m_pulldown instead of copy? */ 1269 m_copydata(m, off + sizeof(struct icmp6_nodeinfo), 1270 subjlen, (caddr_t)&sin6.sin6_addr); 1271 /* XXX kame scope hack */ 1272 if (IN6_IS_SCOPE_LINKLOCAL(&sin6.sin6_addr)) { 1273 if ((m->m_flags & M_PKTHDR) != 0 && 1274 m->m_pkthdr.rcvif) { 1275 sin6.sin6_addr.s6_addr16[1] = 1276 htons(m->m_pkthdr.rcvif->if_index); 1277 } 1278 } 1279 subj = (char *)&sin6; 1280 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &sin6.sin6_addr)) 1281 break; 1282 1283 /* 1284 * XXX if we are to allow other cases, we should really 1285 * be careful about scope here. 1286 * basically, we should disallow queries toward IPv6 1287 * destination X with subject Y, if scope(X) > scope(Y). 1288 * if we allow scope(X) > scope(Y), it will result in 1289 * information leakage across scope boundary. 1290 */ 1291 goto bad; 1292 1293 case ICMP6_NI_SUBJ_FQDN: 1294 /* 1295 * Validate Subject name with gethostname(3). 1296 * 1297 * The behavior may need some debate, since: 1298 * - we are not sure if the node has FQDN as 1299 * hostname (returned by gethostname(3)). 1300 * - the code does wildcard match for truncated names. 1301 * however, we are not sure if we want to perform 1302 * wildcard match, if gethostname(3) side has 1303 * truncated hostname. 1304 */ 1305 n = ni6_nametodns(hostname, hostnamelen, 0); 1306 if (!n || n->m_next || n->m_len == 0) 1307 goto bad; 1308 IP6_EXTHDR_GET(subj, char *, m, 1309 off + sizeof(struct icmp6_nodeinfo), subjlen); 1310 if (subj == NULL) 1311 goto bad; 1312 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *), 1313 n->m_len)) { 1314 goto bad; 1315 } 1316 m_freem(n); 1317 n = NULL; 1318 break; 1319 1320 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */ 1321 default: 1322 goto bad; 1323 } 1324 break; 1325 } 1326 1327 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */ 1328 switch (qtype) { 1329 case NI_QTYPE_FQDN: 1330 if ((icmp6_nodeinfo & 1) == 0) 1331 goto bad; 1332 break; 1333 case NI_QTYPE_NODEADDR: 1334 if ((icmp6_nodeinfo & 2) == 0) 1335 goto bad; 1336 break; 1337 } 1338 1339 /* guess reply length */ 1340 switch (qtype) { 1341 case NI_QTYPE_NOOP: 1342 break; /* no reply data */ 1343 case NI_QTYPE_SUPTYPES: 1344 replylen += sizeof(u_int32_t); 1345 break; 1346 case NI_QTYPE_FQDN: 1347 /* XXX will append an mbuf */ 1348 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1349 break; 1350 case NI_QTYPE_NODEADDR: 1351 addrs = ni6_addrs(ni6, m, &ifp, subj); 1352 if ((replylen += addrs * (sizeof(struct in6_addr) + 1353 sizeof(u_int32_t))) > MCLBYTES) 1354 replylen = MCLBYTES; /* XXX: will truncate pkt later */ 1355 break; 1356 default: 1357 /* 1358 * XXX: We must return a reply with the ICMP6 code 1359 * `unknown Qtype' in this case. However we regard the case 1360 * as an FQDN query for backward compatibility. 1361 * Older versions set a random value to this field, 1362 * so it rarely varies in the defined qtypes. 1363 * But the mechanism is not reliable... 1364 * maybe we should obsolete older versions. 1365 */ 1366 qtype = NI_QTYPE_FQDN; 1367 /* XXX will append an mbuf */ 1368 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1369 oldfqdn++; 1370 break; 1371 } 1372 1373 /* allocate an mbuf to reply. */ 1374 MGETHDR(n, M_DONTWAIT, m->m_type); 1375 if (n == NULL) { 1376 m_freem(m); 1377 return (NULL); 1378 } 1379 M_MOVE_PKTHDR(n, m); /* just for rcvif */ 1380 if (replylen > MHLEN) { 1381 if (replylen > MCLBYTES) { 1382 /* 1383 * XXX: should we try to allocate more? But MCLBYTES 1384 * is probably much larger than IPV6_MMTU... 1385 */ 1386 goto bad; 1387 } 1388 MCLGET(n, M_DONTWAIT); 1389 if ((n->m_flags & M_EXT) == 0) { 1390 goto bad; 1391 } 1392 } 1393 n->m_pkthdr.len = n->m_len = replylen; 1394 1395 /* copy mbuf header and IPv6 + Node Information base headers */ 1396 bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr)); 1397 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1); 1398 bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo)); 1399 1400 /* qtype dependent procedure */ 1401 switch (qtype) { 1402 case NI_QTYPE_NOOP: 1403 nni6->ni_code = ICMP6_NI_SUCCESS; 1404 nni6->ni_flags = 0; 1405 break; 1406 case NI_QTYPE_SUPTYPES: 1407 { 1408 u_int32_t v; 1409 nni6->ni_code = ICMP6_NI_SUCCESS; 1410 nni6->ni_flags = htons(0x0000); /* raw bitmap */ 1411 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */ 1412 v = (u_int32_t)htonl(0x0000000f); 1413 bcopy(&v, nni6 + 1, sizeof(u_int32_t)); 1414 break; 1415 } 1416 case NI_QTYPE_FQDN: 1417 nni6->ni_code = ICMP6_NI_SUCCESS; 1418 fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) + 1419 sizeof(struct ip6_hdr) + 1420 sizeof(struct icmp6_nodeinfo)); 1421 nni6->ni_flags = 0; /* XXX: meaningless TTL */ 1422 fqdn->ni_fqdn_ttl = 0; /* ditto. */ 1423 /* 1424 * XXX do we really have FQDN in variable "hostname"? 1425 */ 1426 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn); 1427 if (n->m_next == NULL) 1428 goto bad; 1429 /* XXX we assume that n->m_next is not a chain */ 1430 if (n->m_next->m_next != NULL) 1431 goto bad; 1432 n->m_pkthdr.len += n->m_next->m_len; 1433 break; 1434 case NI_QTYPE_NODEADDR: 1435 { 1436 int lenlim, copied; 1437 1438 nni6->ni_code = ICMP6_NI_SUCCESS; 1439 n->m_pkthdr.len = n->m_len = 1440 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1441 lenlim = M_TRAILINGSPACE(n); 1442 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim); 1443 /* XXX: reset mbuf length */ 1444 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 1445 sizeof(struct icmp6_nodeinfo) + copied; 1446 break; 1447 } 1448 default: 1449 break; /* XXX impossible! */ 1450 } 1451 1452 nni6->ni_type = ICMP6_NI_REPLY; 1453 m_freem(m); 1454 return (n); 1455 1456 bad: 1457 m_freem(m); 1458 if (n) 1459 m_freem(n); 1460 return (NULL); 1461 } 1462 #undef hostnamelen 1463 1464 #define isupper(x) ('A' <= (x) && (x) <= 'Z') 1465 #define isalpha(x) (('A' <= (x) && (x) <= 'Z') || ('a' <= (x) && (x) <= 'z')) 1466 #define isalnum(x) (isalpha(x) || ('0' <= (x) && (x) <= '9')) 1467 #define tolower(x) (isupper(x) ? (x) + 'a' - 'A' : (x)) 1468 1469 /* 1470 * make a mbuf with DNS-encoded string. no compression support. 1471 * 1472 * XXX names with less than 2 dots (like "foo" or "foo.section") will be 1473 * treated as truncated name (two \0 at the end). this is a wild guess. 1474 */ 1475 static struct mbuf * 1476 ni6_nametodns(name, namelen, old) 1477 const char *name; 1478 int namelen; 1479 int old; /* return pascal string if non-zero */ 1480 { 1481 struct mbuf *m; 1482 char *cp, *ep; 1483 const char *p, *q; 1484 int i, len, nterm; 1485 1486 if (old) 1487 len = namelen + 1; 1488 else 1489 len = MCLBYTES; 1490 1491 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */ 1492 MGET(m, M_DONTWAIT, MT_DATA); 1493 if (m && len > MLEN) { 1494 MCLGET(m, M_DONTWAIT); 1495 if ((m->m_flags & M_EXT) == 0) 1496 goto fail; 1497 } 1498 if (!m) 1499 goto fail; 1500 m->m_next = NULL; 1501 1502 if (old) { 1503 m->m_len = len; 1504 *mtod(m, char *) = namelen; 1505 bcopy(name, mtod(m, char *) + 1, namelen); 1506 return m; 1507 } else { 1508 m->m_len = 0; 1509 cp = mtod(m, char *); 1510 ep = mtod(m, char *) + M_TRAILINGSPACE(m); 1511 1512 /* if not certain about my name, return empty buffer */ 1513 if (namelen == 0) 1514 return m; 1515 1516 /* 1517 * guess if it looks like shortened hostname, or FQDN. 1518 * shortened hostname needs two trailing "\0". 1519 */ 1520 i = 0; 1521 for (p = name; p < name + namelen; p++) { 1522 if (*p && *p == '.') 1523 i++; 1524 } 1525 if (i < 2) 1526 nterm = 2; 1527 else 1528 nterm = 1; 1529 1530 p = name; 1531 while (cp < ep && p < name + namelen) { 1532 i = 0; 1533 for (q = p; q < name + namelen && *q && *q != '.'; q++) 1534 i++; 1535 /* result does not fit into mbuf */ 1536 if (cp + i + 1 >= ep) 1537 goto fail; 1538 /* 1539 * DNS label length restriction, RFC1035 page 8. 1540 * "i == 0" case is included here to avoid returning 1541 * 0-length label on "foo..bar". 1542 */ 1543 if (i <= 0 || i >= 64) 1544 goto fail; 1545 *cp++ = i; 1546 if (!isalpha(p[0]) || !isalnum(p[i - 1])) 1547 goto fail; 1548 while (i > 0) { 1549 if (!isalnum(*p) && *p != '-') 1550 goto fail; 1551 if (isupper(*p)) { 1552 *cp++ = tolower(*p); 1553 p++; 1554 } else 1555 *cp++ = *p++; 1556 i--; 1557 } 1558 p = q; 1559 if (p < name + namelen && *p == '.') 1560 p++; 1561 } 1562 /* termination */ 1563 if (cp + nterm >= ep) 1564 goto fail; 1565 while (nterm-- > 0) 1566 *cp++ = '\0'; 1567 m->m_len = cp - mtod(m, char *); 1568 return m; 1569 } 1570 1571 panic("should not reach here"); 1572 /* NOTREACHED */ 1573 1574 fail: 1575 if (m) 1576 m_freem(m); 1577 return NULL; 1578 } 1579 1580 /* 1581 * check if two DNS-encoded string matches. takes care of truncated 1582 * form (with \0\0 at the end). no compression support. 1583 * XXX upper/lowercase match (see RFC2065) 1584 */ 1585 static int 1586 ni6_dnsmatch(a, alen, b, blen) 1587 const char *a; 1588 int alen; 1589 const char *b; 1590 int blen; 1591 { 1592 const char *a0, *b0; 1593 int l; 1594 1595 /* simplest case - need validation? */ 1596 if (alen == blen && bcmp(a, b, alen) == 0) 1597 return 1; 1598 1599 a0 = a; 1600 b0 = b; 1601 1602 /* termination is mandatory */ 1603 if (alen < 2 || blen < 2) 1604 return 0; 1605 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0') 1606 return 0; 1607 alen--; 1608 blen--; 1609 1610 while (a - a0 < alen && b - b0 < blen) { 1611 if (a - a0 + 1 > alen || b - b0 + 1 > blen) 1612 return 0; 1613 1614 if ((signed char)a[0] < 0 || (signed char)b[0] < 0) 1615 return 0; 1616 /* we don't support compression yet */ 1617 if (a[0] >= 64 || b[0] >= 64) 1618 return 0; 1619 1620 /* truncated case */ 1621 if (a[0] == 0 && a - a0 == alen - 1) 1622 return 1; 1623 if (b[0] == 0 && b - b0 == blen - 1) 1624 return 1; 1625 if (a[0] == 0 || b[0] == 0) 1626 return 0; 1627 1628 if (a[0] != b[0]) 1629 return 0; 1630 l = a[0]; 1631 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen) 1632 return 0; 1633 if (bcmp(a + 1, b + 1, l) != 0) 1634 return 0; 1635 1636 a += 1 + l; 1637 b += 1 + l; 1638 } 1639 1640 if (a - a0 == alen && b - b0 == blen) 1641 return 1; 1642 else 1643 return 0; 1644 } 1645 1646 /* 1647 * calculate the number of addresses to be returned in the node info reply. 1648 */ 1649 static int 1650 ni6_addrs(ni6, m, ifpp, subj) 1651 struct icmp6_nodeinfo *ni6; 1652 struct mbuf *m; 1653 struct ifnet **ifpp; 1654 char *subj; 1655 { 1656 struct ifnet *ifp; 1657 struct in6_ifaddr *ifa6; 1658 struct ifaddr *ifa; 1659 struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */ 1660 int addrs = 0, addrsofif, iffound = 0; 1661 int niflags = ni6->ni_flags; 1662 1663 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) { 1664 switch (ni6->ni_code) { 1665 case ICMP6_NI_SUBJ_IPV6: 1666 if (subj == NULL) /* must be impossible... */ 1667 return (0); 1668 subj_ip6 = (struct sockaddr_in6 *)subj; 1669 break; 1670 default: 1671 /* 1672 * XXX: we only support IPv6 subject address for 1673 * this Qtype. 1674 */ 1675 return (0); 1676 } 1677 } 1678 1679 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) 1680 { 1681 addrsofif = 0; 1682 for (ifa = ifp->if_addrlist.tqh_first; ifa; 1683 ifa = ifa->ifa_list.tqe_next) 1684 { 1685 if (ifa->ifa_addr->sa_family != AF_INET6) 1686 continue; 1687 ifa6 = (struct in6_ifaddr *)ifa; 1688 1689 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 && 1690 IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr, 1691 &ifa6->ia_addr.sin6_addr)) 1692 iffound = 1; 1693 1694 /* 1695 * IPv4-mapped addresses can only be returned by a 1696 * Node Information proxy, since they represent 1697 * addresses of IPv4-only nodes, which perforce do 1698 * not implement this protocol. 1699 * [icmp-name-lookups-07, Section 5.4] 1700 * So we don't support NI_NODEADDR_FLAG_COMPAT in 1701 * this function at this moment. 1702 */ 1703 1704 /* What do we have to do about ::1? */ 1705 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) { 1706 case IPV6_ADDR_SCOPE_LINKLOCAL: 1707 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1708 continue; 1709 break; 1710 case IPV6_ADDR_SCOPE_SITELOCAL: 1711 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1712 continue; 1713 break; 1714 case IPV6_ADDR_SCOPE_GLOBAL: 1715 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1716 continue; 1717 break; 1718 default: 1719 continue; 1720 } 1721 1722 /* 1723 * check if anycast is okay. 1724 * XXX: just experimental. not in the spec. 1725 */ 1726 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1727 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 1728 continue; /* we need only unicast addresses */ 1729 1730 addrsofif++; /* count the address */ 1731 } 1732 if (iffound) { 1733 *ifpp = ifp; 1734 return (addrsofif); 1735 } 1736 1737 addrs += addrsofif; 1738 } 1739 1740 return (addrs); 1741 } 1742 1743 static int 1744 ni6_store_addrs(ni6, nni6, ifp0, resid) 1745 struct icmp6_nodeinfo *ni6, *nni6; 1746 struct ifnet *ifp0; 1747 int resid; 1748 { 1749 struct ifnet *ifp = ifp0 ? ifp0 : TAILQ_FIRST(&ifnet); 1750 struct in6_ifaddr *ifa6; 1751 struct ifaddr *ifa; 1752 struct ifnet *ifp_dep = NULL; 1753 int copied = 0, allow_deprecated = 0; 1754 u_char *cp = (u_char *)(nni6 + 1); 1755 int niflags = ni6->ni_flags; 1756 u_int32_t ltime; 1757 1758 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL)) 1759 return (0); /* needless to copy */ 1760 1761 again: 1762 1763 for (; ifp; ifp = TAILQ_NEXT(ifp, if_list)) 1764 { 1765 for (ifa = ifp->if_addrlist.tqh_first; ifa; 1766 ifa = ifa->ifa_list.tqe_next) 1767 { 1768 if (ifa->ifa_addr->sa_family != AF_INET6) 1769 continue; 1770 ifa6 = (struct in6_ifaddr *)ifa; 1771 1772 if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) != 0 && 1773 allow_deprecated == 0) { 1774 /* 1775 * prefererred address should be put before 1776 * deprecated addresses. 1777 */ 1778 1779 /* record the interface for later search */ 1780 if (ifp_dep == NULL) 1781 ifp_dep = ifp; 1782 1783 continue; 1784 } 1785 else if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) == 0 && 1786 allow_deprecated != 0) 1787 continue; /* we now collect deprecated addrs */ 1788 1789 /* What do we have to do about ::1? */ 1790 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) { 1791 case IPV6_ADDR_SCOPE_LINKLOCAL: 1792 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1793 continue; 1794 break; 1795 case IPV6_ADDR_SCOPE_SITELOCAL: 1796 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1797 continue; 1798 break; 1799 case IPV6_ADDR_SCOPE_GLOBAL: 1800 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1801 continue; 1802 break; 1803 default: 1804 continue; 1805 } 1806 1807 /* 1808 * check if anycast is okay. 1809 * XXX: just experimental. not in the spec. 1810 */ 1811 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1812 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 1813 continue; 1814 1815 /* now we can copy the address */ 1816 if (resid < sizeof(struct in6_addr) + 1817 sizeof(u_int32_t)) { 1818 /* 1819 * We give up much more copy. 1820 * Set the truncate flag and return. 1821 */ 1822 nni6->ni_flags |= 1823 NI_NODEADDR_FLAG_TRUNCATE; 1824 return (copied); 1825 } 1826 1827 /* 1828 * Set the TTL of the address. 1829 * The TTL value should be one of the following 1830 * according to the specification: 1831 * 1832 * 1. The remaining lifetime of a DHCP lease on the 1833 * address, or 1834 * 2. The remaining Valid Lifetime of a prefix from 1835 * which the address was derived through Stateless 1836 * Autoconfiguration. 1837 * 1838 * Note that we currently do not support stateful 1839 * address configuration by DHCPv6, so the former 1840 * case can't happen. 1841 * 1842 * TTL must be 2^31 > TTL >= 0. 1843 */ 1844 if (ifa6->ia6_lifetime.ia6t_expire == 0) 1845 ltime = ND6_INFINITE_LIFETIME; 1846 else { 1847 if (ifa6->ia6_lifetime.ia6t_expire > 1848 time.tv_sec) 1849 ltime = ifa6->ia6_lifetime.ia6t_expire - time.tv_sec; 1850 else 1851 ltime = 0; 1852 } 1853 if (ltime > 0x7fffffff) 1854 ltime = 0x7fffffff; 1855 ltime = htonl(ltime); 1856 1857 bcopy(<ime, cp, sizeof(u_int32_t)); 1858 cp += sizeof(u_int32_t); 1859 1860 /* copy the address itself */ 1861 bcopy(&ifa6->ia_addr.sin6_addr, cp, 1862 sizeof(struct in6_addr)); 1863 /* XXX: KAME link-local hack; remove ifindex */ 1864 if (IN6_IS_ADDR_LINKLOCAL(&ifa6->ia_addr.sin6_addr)) 1865 ((struct in6_addr *)cp)->s6_addr16[1] = 0; 1866 cp += sizeof(struct in6_addr); 1867 1868 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1869 copied += (sizeof(struct in6_addr) + 1870 sizeof(u_int32_t)); 1871 } 1872 if (ifp0) /* we need search only on the specified IF */ 1873 break; 1874 } 1875 1876 if (allow_deprecated == 0 && ifp_dep != NULL) { 1877 ifp = ifp_dep; 1878 allow_deprecated = 1; 1879 1880 goto again; 1881 } 1882 1883 return (copied); 1884 } 1885 1886 /* 1887 * XXX almost dup'ed code with rip6_input. 1888 */ 1889 static int 1890 icmp6_rip6_input(mp, off) 1891 struct mbuf **mp; 1892 int off; 1893 { 1894 struct mbuf *m = *mp; 1895 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1896 struct inpcb_hdr *inph; 1897 struct in6pcb *in6p; 1898 struct in6pcb *last = NULL; 1899 struct sockaddr_in6 rip6src; 1900 struct icmp6_hdr *icmp6; 1901 struct mbuf *opts = NULL; 1902 1903 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 1904 if (icmp6 == NULL) { 1905 /* m is already reclaimed */ 1906 return IPPROTO_DONE; 1907 } 1908 1909 bzero(&rip6src, sizeof(rip6src)); 1910 rip6src.sin6_len = sizeof(struct sockaddr_in6); 1911 rip6src.sin6_family = AF_INET6; 1912 /* KAME hack: recover scopeid */ 1913 (void)in6_recoverscope(&rip6src, &ip6->ip6_src, m->m_pkthdr.rcvif); 1914 1915 CIRCLEQ_FOREACH(inph, &raw6cbtable.inpt_queue, inph_queue) { 1916 in6p = (struct in6pcb *)inph; 1917 if (in6p->in6p_af != AF_INET6) 1918 continue; 1919 if (in6p->in6p_ip6.ip6_nxt != IPPROTO_ICMPV6) 1920 continue; 1921 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && 1922 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst)) 1923 continue; 1924 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) && 1925 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src)) 1926 continue; 1927 if (in6p->in6p_icmp6filt 1928 && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type, 1929 in6p->in6p_icmp6filt)) 1930 continue; 1931 if (last) { 1932 struct mbuf *n; 1933 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { 1934 if (last->in6p_flags & IN6P_CONTROLOPTS) 1935 ip6_savecontrol(last, &opts, ip6, n); 1936 /* strip intermediate headers */ 1937 m_adj(n, off); 1938 if (sbappendaddr(&last->in6p_socket->so_rcv, 1939 (struct sockaddr *)&rip6src, 1940 n, opts) == 0) { 1941 /* should notify about lost packet */ 1942 m_freem(n); 1943 if (opts) 1944 m_freem(opts); 1945 } else 1946 sorwakeup(last->in6p_socket); 1947 opts = NULL; 1948 } 1949 } 1950 last = in6p; 1951 } 1952 if (last) { 1953 if (last->in6p_flags & IN6P_CONTROLOPTS) 1954 ip6_savecontrol(last, &opts, ip6, m); 1955 /* strip intermediate headers */ 1956 m_adj(m, off); 1957 if (sbappendaddr(&last->in6p_socket->so_rcv, 1958 (struct sockaddr *)&rip6src, m, opts) == 0) { 1959 m_freem(m); 1960 if (opts) 1961 m_freem(opts); 1962 } else 1963 sorwakeup(last->in6p_socket); 1964 } else { 1965 m_freem(m); 1966 ip6stat.ip6s_delivered--; 1967 } 1968 return IPPROTO_DONE; 1969 } 1970 1971 /* 1972 * Reflect the ip6 packet back to the source. 1973 * OFF points to the icmp6 header, counted from the top of the mbuf. 1974 * 1975 * Note: RFC 1885 required that an echo reply should be truncated if it 1976 * did not fit in with (return) path MTU, and KAME code supported the 1977 * behavior. However, as a clarification after the RFC, this limitation 1978 * was removed in a revised version of the spec, RFC 2463. We had kept the 1979 * old behavior, with a (non-default) ifdef block, while the new version of 1980 * the spec was an internet-draft status, and even after the new RFC was 1981 * published. But it would rather make sense to clean the obsoleted part 1982 * up, and to make the code simpler at this stage. 1983 */ 1984 void 1985 icmp6_reflect(m, off) 1986 struct mbuf *m; 1987 size_t off; 1988 { 1989 struct ip6_hdr *ip6; 1990 struct icmp6_hdr *icmp6; 1991 struct in6_ifaddr *ia; 1992 struct in6_addr t, *src = 0; 1993 int plen; 1994 int type, code; 1995 struct ifnet *outif = NULL; 1996 struct sockaddr_in6 sa6_src, sa6_dst; 1997 1998 /* too short to reflect */ 1999 if (off < sizeof(struct ip6_hdr)) { 2000 nd6log((LOG_DEBUG, 2001 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n", 2002 (u_long)off, (u_long)sizeof(struct ip6_hdr), 2003 __FILE__, __LINE__)); 2004 goto bad; 2005 } 2006 2007 /* 2008 * If there are extra headers between IPv6 and ICMPv6, strip 2009 * off that header first. 2010 */ 2011 #ifdef DIAGNOSTIC 2012 if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN) 2013 panic("assumption failed in icmp6_reflect"); 2014 #endif 2015 if (off > sizeof(struct ip6_hdr)) { 2016 size_t l; 2017 struct ip6_hdr nip6; 2018 2019 l = off - sizeof(struct ip6_hdr); 2020 m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6); 2021 m_adj(m, l); 2022 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2023 if (m->m_len < l) { 2024 if ((m = m_pullup(m, l)) == NULL) 2025 return; 2026 } 2027 bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6)); 2028 } else /* off == sizeof(struct ip6_hdr) */ { 2029 size_t l; 2030 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2031 if (m->m_len < l) { 2032 if ((m = m_pullup(m, l)) == NULL) 2033 return; 2034 } 2035 } 2036 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr); 2037 ip6 = mtod(m, struct ip6_hdr *); 2038 ip6->ip6_nxt = IPPROTO_ICMPV6; 2039 icmp6 = (struct icmp6_hdr *)(ip6 + 1); 2040 type = icmp6->icmp6_type; /* keep type for statistics */ 2041 code = icmp6->icmp6_code; /* ditto. */ 2042 2043 t = ip6->ip6_dst; 2044 /* 2045 * ip6_input() drops a packet if its src is multicast. 2046 * So, the src is never multicast. 2047 */ 2048 ip6->ip6_dst = ip6->ip6_src; 2049 2050 /* 2051 * XXX: make sure to embed scope zone information, using 2052 * already embedded IDs or the received interface (if any). 2053 * Note that rcvif may be NULL. 2054 * TODO: scoped routing case (XXX). 2055 */ 2056 bzero(&sa6_src, sizeof(sa6_src)); 2057 sa6_src.sin6_family = AF_INET6; 2058 sa6_src.sin6_len = sizeof(sa6_src); 2059 sa6_src.sin6_addr = ip6->ip6_dst; 2060 in6_recoverscope(&sa6_src, &ip6->ip6_dst, m->m_pkthdr.rcvif); 2061 in6_embedscope(&sa6_src.sin6_addr, &sa6_src, NULL, NULL); 2062 ip6->ip6_dst = sa6_src.sin6_addr; 2063 2064 bzero(&sa6_dst, sizeof(sa6_dst)); 2065 sa6_dst.sin6_family = AF_INET6; 2066 sa6_dst.sin6_len = sizeof(sa6_dst); 2067 sa6_dst.sin6_addr = t; 2068 in6_recoverscope(&sa6_dst, &t, m->m_pkthdr.rcvif); 2069 in6_embedscope(&t, &sa6_dst, NULL, NULL); 2070 2071 /* 2072 * If the incoming packet was addressed directly to us (i.e. unicast), 2073 * use dst as the src for the reply. 2074 * The IN6_IFF_NOTREADY case would be VERY rare, but is possible 2075 * (for example) when we encounter an error while forwarding procedure 2076 * destined to a duplicated address of ours. 2077 */ 2078 for (ia = in6_ifaddr; ia; ia = ia->ia_next) 2079 if (IN6_ARE_ADDR_EQUAL(&t, &ia->ia_addr.sin6_addr) && 2080 (ia->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) { 2081 src = &t; 2082 break; 2083 } 2084 if (ia == NULL && IN6_IS_ADDR_LINKLOCAL(&t) && (m->m_flags & M_LOOP)) { 2085 /* 2086 * This is the case if the dst is our link-local address 2087 * and the sender is also ourselves. 2088 */ 2089 src = &t; 2090 } 2091 2092 if (src == 0) { 2093 int e; 2094 struct route_in6 ro; 2095 2096 /* 2097 * This case matches to multicasts, our anycast, or unicasts 2098 * that we do not own. Select a source address based on the 2099 * source address of the erroneous packet. 2100 */ 2101 bzero(&ro, sizeof(ro)); 2102 src = in6_selectsrc(&sa6_src, NULL, NULL, &ro, NULL, &e); 2103 if (ro.ro_rt) { /* XXX: see comments in icmp6_mtudisc_update */ 2104 RTFREE(ro.ro_rt); /* XXX: we could use this */ 2105 } 2106 if (src == NULL) { 2107 nd6log((LOG_DEBUG, 2108 "icmp6_reflect: source can't be determined: " 2109 "dst=%s, error=%d\n", 2110 ip6_sprintf(&sa6_src.sin6_addr), e)); 2111 goto bad; 2112 } 2113 } 2114 2115 ip6->ip6_src = *src; 2116 2117 ip6->ip6_flow = 0; 2118 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2119 ip6->ip6_vfc |= IPV6_VERSION; 2120 ip6->ip6_nxt = IPPROTO_ICMPV6; 2121 if (m->m_pkthdr.rcvif) { 2122 /* XXX: This may not be the outgoing interface */ 2123 ip6->ip6_hlim = ND_IFINFO(m->m_pkthdr.rcvif)->chlim; 2124 } else 2125 ip6->ip6_hlim = ip6_defhlim; 2126 2127 icmp6->icmp6_cksum = 0; 2128 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6, 2129 sizeof(struct ip6_hdr), plen); 2130 2131 /* 2132 * XXX option handling 2133 */ 2134 2135 m->m_flags &= ~(M_BCAST|M_MCAST); 2136 2137 /* 2138 * To avoid a "too big" situation at an intermediate router 2139 * and the path MTU discovery process, specify the IPV6_MINMTU flag. 2140 * Note that only echo and node information replies are affected, 2141 * since the length of ICMP6 errors is limited to the minimum MTU. 2142 */ 2143 if (ip6_output(m, NULL, NULL, IPV6_MINMTU, 2144 (struct ip6_moptions *)NULL, (struct socket *)NULL, &outif) != 0 2145 && outif) 2146 icmp6_ifstat_inc(outif, ifs6_out_error); 2147 2148 if (outif) 2149 icmp6_ifoutstat_inc(outif, type, code); 2150 2151 return; 2152 2153 bad: 2154 m_freem(m); 2155 return; 2156 } 2157 2158 void 2159 icmp6_fasttimo() 2160 { 2161 2162 mld6_fasttimeo(); 2163 } 2164 2165 static const char * 2166 icmp6_redirect_diag(src6, dst6, tgt6) 2167 struct in6_addr *src6; 2168 struct in6_addr *dst6; 2169 struct in6_addr *tgt6; 2170 { 2171 static char buf[1024]; 2172 snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)", 2173 ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6)); 2174 return buf; 2175 } 2176 2177 void 2178 icmp6_redirect_input(m, off) 2179 struct mbuf *m; 2180 int off; 2181 { 2182 struct ifnet *ifp = m->m_pkthdr.rcvif; 2183 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 2184 struct nd_redirect *nd_rd; 2185 int icmp6len = ntohs(ip6->ip6_plen); 2186 char *lladdr = NULL; 2187 int lladdrlen = 0; 2188 struct rtentry *rt = NULL; 2189 int is_router; 2190 int is_onlink; 2191 struct in6_addr src6 = ip6->ip6_src; 2192 struct in6_addr redtgt6; 2193 struct in6_addr reddst6; 2194 union nd_opts ndopts; 2195 2196 if (!ifp) 2197 return; 2198 2199 /* XXX if we are router, we don't update route by icmp6 redirect */ 2200 if (ip6_forwarding) 2201 goto freeit; 2202 if (!icmp6_rediraccept) 2203 goto freeit; 2204 2205 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len); 2206 if (nd_rd == NULL) { 2207 icmp6stat.icp6s_tooshort++; 2208 return; 2209 } 2210 redtgt6 = nd_rd->nd_rd_target; 2211 reddst6 = nd_rd->nd_rd_dst; 2212 2213 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 2214 redtgt6.s6_addr16[1] = htons(ifp->if_index); 2215 if (IN6_IS_ADDR_LINKLOCAL(&reddst6)) 2216 reddst6.s6_addr16[1] = htons(ifp->if_index); 2217 2218 /* validation */ 2219 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) { 2220 nd6log((LOG_ERR, 2221 "ICMP6 redirect sent from %s rejected; " 2222 "must be from linklocal\n", ip6_sprintf(&src6))); 2223 goto bad; 2224 } 2225 if (ip6->ip6_hlim != 255) { 2226 nd6log((LOG_ERR, 2227 "ICMP6 redirect sent from %s rejected; " 2228 "hlim=%d (must be 255)\n", 2229 ip6_sprintf(&src6), ip6->ip6_hlim)); 2230 goto bad; 2231 } 2232 { 2233 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */ 2234 struct sockaddr_in6 sin6; 2235 struct in6_addr *gw6; 2236 2237 bzero(&sin6, sizeof(sin6)); 2238 sin6.sin6_family = AF_INET6; 2239 sin6.sin6_len = sizeof(struct sockaddr_in6); 2240 bcopy(&reddst6, &sin6.sin6_addr, sizeof(reddst6)); 2241 rt = rtalloc1((struct sockaddr *)&sin6, 0); 2242 if (rt) { 2243 if (rt->rt_gateway == NULL || 2244 rt->rt_gateway->sa_family != AF_INET6) { 2245 nd6log((LOG_ERR, 2246 "ICMP6 redirect rejected; no route " 2247 "with inet6 gateway found for redirect dst: %s\n", 2248 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2249 RTFREE(rt); 2250 goto bad; 2251 } 2252 2253 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr); 2254 if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) { 2255 nd6log((LOG_ERR, 2256 "ICMP6 redirect rejected; " 2257 "not equal to gw-for-src=%s (must be same): " 2258 "%s\n", 2259 ip6_sprintf(gw6), 2260 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2261 RTFREE(rt); 2262 goto bad; 2263 } 2264 } else { 2265 nd6log((LOG_ERR, 2266 "ICMP6 redirect rejected; " 2267 "no route found for redirect dst: %s\n", 2268 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2269 goto bad; 2270 } 2271 RTFREE(rt); 2272 rt = NULL; 2273 } 2274 if (IN6_IS_ADDR_MULTICAST(&reddst6)) { 2275 nd6log((LOG_ERR, 2276 "ICMP6 redirect rejected; " 2277 "redirect dst must be unicast: %s\n", 2278 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2279 goto bad; 2280 } 2281 2282 is_router = is_onlink = 0; 2283 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 2284 is_router = 1; /* router case */ 2285 if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0) 2286 is_onlink = 1; /* on-link destination case */ 2287 if (!is_router && !is_onlink) { 2288 nd6log((LOG_ERR, 2289 "ICMP6 redirect rejected; " 2290 "neither router case nor onlink case: %s\n", 2291 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2292 goto bad; 2293 } 2294 /* validation passed */ 2295 2296 icmp6len -= sizeof(*nd_rd); 2297 nd6_option_init(nd_rd + 1, icmp6len, &ndopts); 2298 if (nd6_options(&ndopts) < 0) { 2299 nd6log((LOG_INFO, "icmp6_redirect_input: " 2300 "invalid ND option, rejected: %s\n", 2301 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2302 /* nd6_options have incremented stats */ 2303 goto freeit; 2304 } 2305 2306 if (ndopts.nd_opts_tgt_lladdr) { 2307 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 2308 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 2309 } 2310 2311 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 2312 nd6log((LOG_INFO, 2313 "icmp6_redirect_input: lladdrlen mismatch for %s " 2314 "(if %d, icmp6 packet %d): %s\n", 2315 ip6_sprintf(&redtgt6), ifp->if_addrlen, lladdrlen - 2, 2316 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2317 goto bad; 2318 } 2319 2320 /* RFC 2461 8.3 */ 2321 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT, 2322 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER); 2323 2324 if (!is_onlink) { /* better router case. perform rtredirect. */ 2325 /* perform rtredirect */ 2326 struct sockaddr_in6 sdst; 2327 struct sockaddr_in6 sgw; 2328 struct sockaddr_in6 ssrc; 2329 unsigned long rtcount; 2330 struct rtentry *newrt = NULL; 2331 2332 /* 2333 * do not install redirect route, if the number of entries 2334 * is too much (> hiwat). note that, the node (= host) will 2335 * work just fine even if we do not install redirect route 2336 * (there will be additional hops, though). 2337 */ 2338 rtcount = rt_timer_count(icmp6_redirect_timeout_q); 2339 if (0 <= icmp6_redirect_hiwat && rtcount > icmp6_redirect_hiwat) 2340 return; 2341 else if (0 <= icmp6_redirect_lowat && 2342 rtcount > icmp6_redirect_lowat) { 2343 /* 2344 * XXX nuke a victim, install the new one. 2345 */ 2346 } 2347 2348 bzero(&sdst, sizeof(sdst)); 2349 bzero(&sgw, sizeof(sgw)); 2350 bzero(&ssrc, sizeof(ssrc)); 2351 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6; 2352 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len = 2353 sizeof(struct sockaddr_in6); 2354 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr)); 2355 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2356 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr)); 2357 rtredirect((struct sockaddr *)&sdst, (struct sockaddr *)&sgw, 2358 (struct sockaddr *)NULL, RTF_GATEWAY | RTF_HOST, 2359 (struct sockaddr *)&ssrc, 2360 &newrt); 2361 2362 if (newrt) { 2363 (void)rt_timer_add(newrt, icmp6_redirect_timeout, 2364 icmp6_redirect_timeout_q); 2365 rtfree(newrt); 2366 } 2367 } 2368 /* finally update cached route in each socket via pfctlinput */ 2369 { 2370 struct sockaddr_in6 sdst; 2371 2372 bzero(&sdst, sizeof(sdst)); 2373 sdst.sin6_family = AF_INET6; 2374 sdst.sin6_len = sizeof(struct sockaddr_in6); 2375 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2376 pfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst); 2377 #ifdef IPSEC 2378 key_sa_routechange((struct sockaddr *)&sdst); 2379 #endif 2380 } 2381 2382 freeit: 2383 m_freem(m); 2384 return; 2385 2386 bad: 2387 icmp6stat.icp6s_badredirect++; 2388 m_freem(m); 2389 } 2390 2391 void 2392 icmp6_redirect_output(m0, rt) 2393 struct mbuf *m0; 2394 struct rtentry *rt; 2395 { 2396 struct ifnet *ifp; /* my outgoing interface */ 2397 struct in6_addr *ifp_ll6; 2398 struct in6_addr *nexthop; 2399 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */ 2400 struct mbuf *m = NULL; /* newly allocated one */ 2401 struct ip6_hdr *ip6; /* m as struct ip6_hdr */ 2402 struct nd_redirect *nd_rd; 2403 size_t maxlen; 2404 u_char *p; 2405 struct sockaddr_in6 src_sa; 2406 2407 icmp6_errcount(&icmp6stat.icp6s_outerrhist, ND_REDIRECT, 0); 2408 2409 /* if we are not router, we don't send icmp6 redirect */ 2410 if (!ip6_forwarding) 2411 goto fail; 2412 2413 /* sanity check */ 2414 if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp)) 2415 goto fail; 2416 2417 /* 2418 * Address check: 2419 * the source address must identify a neighbor, and 2420 * the destination address must not be a multicast address 2421 * [RFC 2461, sec 8.2] 2422 */ 2423 sip6 = mtod(m0, struct ip6_hdr *); 2424 bzero(&src_sa, sizeof(src_sa)); 2425 src_sa.sin6_family = AF_INET6; 2426 src_sa.sin6_len = sizeof(src_sa); 2427 src_sa.sin6_addr = sip6->ip6_src; 2428 /* we don't currently use sin6_scope_id, but eventually use it */ 2429 src_sa.sin6_scope_id = in6_addr2scopeid(ifp, &sip6->ip6_src); 2430 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0) 2431 goto fail; 2432 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst)) 2433 goto fail; /* what should we do here? */ 2434 2435 /* rate limit */ 2436 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0)) 2437 goto fail; 2438 2439 /* 2440 * Since we are going to append up to 1280 bytes (= IPV6_MMTU), 2441 * we almost always ask for an mbuf cluster for simplicity. 2442 * (MHLEN < IPV6_MMTU is almost always true) 2443 */ 2444 #if IPV6_MMTU >= MCLBYTES 2445 # error assumption failed about IPV6_MMTU and MCLBYTES 2446 #endif 2447 MGETHDR(m, M_DONTWAIT, MT_HEADER); 2448 if (m && IPV6_MMTU >= MHLEN) 2449 MCLGET(m, M_DONTWAIT); 2450 if (!m) 2451 goto fail; 2452 m->m_pkthdr.rcvif = NULL; 2453 m->m_len = 0; 2454 maxlen = M_TRAILINGSPACE(m); 2455 maxlen = min(IPV6_MMTU, maxlen); 2456 /* just for safety */ 2457 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) + 2458 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) { 2459 goto fail; 2460 } 2461 2462 { 2463 /* get ip6 linklocal address for ifp(my outgoing interface). */ 2464 struct in6_ifaddr *ia; 2465 if ((ia = in6ifa_ifpforlinklocal(ifp, 2466 IN6_IFF_NOTREADY| 2467 IN6_IFF_ANYCAST)) == NULL) 2468 goto fail; 2469 ifp_ll6 = &ia->ia_addr.sin6_addr; 2470 } 2471 2472 /* get ip6 linklocal address for the router. */ 2473 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) { 2474 struct sockaddr_in6 *sin6; 2475 sin6 = (struct sockaddr_in6 *)rt->rt_gateway; 2476 nexthop = &sin6->sin6_addr; 2477 if (!IN6_IS_ADDR_LINKLOCAL(nexthop)) 2478 nexthop = NULL; 2479 } else 2480 nexthop = NULL; 2481 2482 /* ip6 */ 2483 ip6 = mtod(m, struct ip6_hdr *); 2484 ip6->ip6_flow = 0; 2485 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2486 ip6->ip6_vfc |= IPV6_VERSION; 2487 /* ip6->ip6_plen will be set later */ 2488 ip6->ip6_nxt = IPPROTO_ICMPV6; 2489 ip6->ip6_hlim = 255; 2490 /* ip6->ip6_src must be linklocal addr for my outgoing if. */ 2491 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr)); 2492 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr)); 2493 2494 /* ND Redirect */ 2495 nd_rd = (struct nd_redirect *)(ip6 + 1); 2496 nd_rd->nd_rd_type = ND_REDIRECT; 2497 nd_rd->nd_rd_code = 0; 2498 nd_rd->nd_rd_reserved = 0; 2499 if (rt->rt_flags & RTF_GATEWAY) { 2500 /* 2501 * nd_rd->nd_rd_target must be a link-local address in 2502 * better router cases. 2503 */ 2504 if (!nexthop) 2505 goto fail; 2506 bcopy(nexthop, &nd_rd->nd_rd_target, 2507 sizeof(nd_rd->nd_rd_target)); 2508 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2509 sizeof(nd_rd->nd_rd_dst)); 2510 } else { 2511 /* make sure redtgt == reddst */ 2512 nexthop = &sip6->ip6_dst; 2513 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target, 2514 sizeof(nd_rd->nd_rd_target)); 2515 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2516 sizeof(nd_rd->nd_rd_dst)); 2517 } 2518 2519 p = (u_char *)(nd_rd + 1); 2520 2521 { 2522 /* target lladdr option */ 2523 struct rtentry *rt_nexthop = NULL; 2524 int len; 2525 struct sockaddr_dl *sdl; 2526 struct nd_opt_hdr *nd_opt; 2527 char *lladdr; 2528 2529 rt_nexthop = nd6_lookup(nexthop, 0, ifp); 2530 if (!rt_nexthop) 2531 goto nolladdropt; 2532 len = sizeof(*nd_opt) + ifp->if_addrlen; 2533 len = (len + 7) & ~7; /* round by 8 */ 2534 /* safety check */ 2535 if (len + (p - (u_char *)ip6) > maxlen) 2536 goto nolladdropt; 2537 if (!(rt_nexthop->rt_flags & RTF_GATEWAY) && 2538 (rt_nexthop->rt_flags & RTF_LLINFO) && 2539 (rt_nexthop->rt_gateway->sa_family == AF_LINK) && 2540 (sdl = (struct sockaddr_dl *)rt_nexthop->rt_gateway) && 2541 sdl->sdl_alen) { 2542 nd_opt = (struct nd_opt_hdr *)p; 2543 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 2544 nd_opt->nd_opt_len = len >> 3; 2545 lladdr = (char *)(nd_opt + 1); 2546 bcopy(LLADDR(sdl), lladdr, ifp->if_addrlen); 2547 p += len; 2548 } 2549 } 2550 nolladdropt:; 2551 2552 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2553 2554 /* just to be safe */ 2555 if (m0->m_flags & M_DECRYPTED) 2556 goto noredhdropt; 2557 if (p - (u_char *)ip6 > maxlen) 2558 goto noredhdropt; 2559 2560 { 2561 /* redirected header option */ 2562 int len; 2563 struct nd_opt_rd_hdr *nd_opt_rh; 2564 2565 /* 2566 * compute the maximum size for icmp6 redirect header option. 2567 * XXX room for auth header? 2568 */ 2569 len = maxlen - (p - (u_char *)ip6); 2570 len &= ~7; 2571 2572 /* 2573 * Redirected header option spec (RFC2461 4.6.3) talks nothing 2574 * about padding/truncate rule for the original IP packet. 2575 * From the discussion on IPv6imp in Feb 1999, 2576 * the consensus was: 2577 * - "attach as much as possible" is the goal 2578 * - pad if not aligned (original size can be guessed by 2579 * original ip6 header) 2580 * Following code adds the padding if it is simple enough, 2581 * and truncates if not. 2582 */ 2583 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) { 2584 /* not enough room, truncate */ 2585 m_adj(m0, (len - sizeof(*nd_opt_rh)) - 2586 m0->m_pkthdr.len); 2587 } else { 2588 /* 2589 * enough room, truncate if not aligned. 2590 * we don't pad here for simplicity. 2591 */ 2592 size_t extra; 2593 2594 extra = m0->m_pkthdr.len % 8; 2595 if (extra) { 2596 /* truncate */ 2597 m_adj(m0, -extra); 2598 } 2599 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh); 2600 } 2601 2602 nd_opt_rh = (struct nd_opt_rd_hdr *)p; 2603 bzero(nd_opt_rh, sizeof(*nd_opt_rh)); 2604 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER; 2605 nd_opt_rh->nd_opt_rh_len = len >> 3; 2606 p += sizeof(*nd_opt_rh); 2607 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2608 2609 /* connect m0 to m */ 2610 m->m_pkthdr.len += m0->m_pkthdr.len; 2611 m_cat(m, m0); 2612 m0 = NULL; 2613 } 2614 noredhdropt: 2615 if (m0) { 2616 m_freem(m0); 2617 m0 = NULL; 2618 } 2619 2620 sip6 = mtod(m, struct ip6_hdr *); 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