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sys/netinet6/icmp6.c
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1 /* $NetBSD: icmp6.c,v 1.108.6.1 2008/10/03 09:20:48 jdc 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 1.108.6.1 2008/10/03 09:20:48 jdc 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 /* 519 * MTU is checked in icmp6_mtudisc. 520 */ 521 code = PRC_MSGSIZE; 522 523 /* 524 * Updating the path MTU will be done after examining 525 * intermediate extension headers. 526 */ 527 goto deliver; 528 529 case ICMP6_TIME_EXCEEDED: 530 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_timeexceed); 531 switch (code) { 532 case ICMP6_TIME_EXCEED_TRANSIT: 533 code = PRC_TIMXCEED_INTRANS; 534 break; 535 case ICMP6_TIME_EXCEED_REASSEMBLY: 536 code = PRC_TIMXCEED_REASS; 537 break; 538 default: 539 goto badcode; 540 } 541 goto deliver; 542 543 case ICMP6_PARAM_PROB: 544 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_paramprob); 545 switch (code) { 546 case ICMP6_PARAMPROB_NEXTHEADER: 547 code = PRC_UNREACH_PROTOCOL; 548 break; 549 case ICMP6_PARAMPROB_HEADER: 550 case ICMP6_PARAMPROB_OPTION: 551 code = PRC_PARAMPROB; 552 break; 553 default: 554 goto badcode; 555 } 556 goto deliver; 557 558 case ICMP6_ECHO_REQUEST: 559 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echo); 560 if (code != 0) 561 goto badcode; 562 /* 563 * Copy mbuf to send to two data paths: userland socket(s), 564 * and to the querier (echo reply). 565 * m: a copy for socket, n: a copy for querier 566 */ 567 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 568 /* Give up local */ 569 n = m; 570 m = NULL; 571 goto deliverecho; 572 } 573 /* 574 * If the first mbuf is shared, or the first mbuf is too short, 575 * copy the first part of the data into a fresh mbuf. 576 * Otherwise, we will wrongly overwrite both copies. 577 */ 578 if ((n->m_flags & M_EXT) != 0 || 579 n->m_len < off + sizeof(struct icmp6_hdr)) { 580 struct mbuf *n0 = n; 581 const int maxlen = sizeof(*nip6) + sizeof(*nicmp6); 582 583 /* 584 * Prepare an internal mbuf. m_pullup() doesn't 585 * always copy the length we specified. 586 */ 587 if (maxlen >= MCLBYTES) { 588 /* Give up remote */ 589 m_freem(n0); 590 break; 591 } 592 MGETHDR(n, M_DONTWAIT, n0->m_type); 593 if (n && maxlen >= MHLEN) { 594 MCLGET(n, M_DONTWAIT); 595 if ((n->m_flags & M_EXT) == 0) { 596 m_free(n); 597 n = NULL; 598 } 599 } 600 if (n == NULL) { 601 /* Give up local */ 602 m_freem(n0); 603 n = m; 604 m = NULL; 605 goto deliverecho; 606 } 607 M_COPY_PKTHDR(n, n0); 608 /* 609 * Copy IPv6 and ICMPv6 only. 610 */ 611 nip6 = mtod(n, struct ip6_hdr *); 612 bcopy(ip6, nip6, sizeof(struct ip6_hdr)); 613 nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 614 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); 615 noff = sizeof(struct ip6_hdr); 616 n->m_len = noff + sizeof(struct icmp6_hdr); 617 /* 618 * Adjust mbuf. ip6_plen will be adjusted in 619 * ip6_output(). 620 * n->m_pkthdr.len == n0->m_pkthdr.len at this point. 621 */ 622 n->m_pkthdr.len += noff + sizeof(struct icmp6_hdr); 623 n->m_pkthdr.len -= (off + sizeof(struct icmp6_hdr)); 624 m_adj(n0, off + sizeof(struct icmp6_hdr)); 625 n->m_next = n0; 626 n0->m_flags &= ~M_PKTHDR; 627 } else { 628 deliverecho: 629 nip6 = mtod(n, struct ip6_hdr *); 630 nicmp6 = (struct icmp6_hdr *)((caddr_t)nip6 + off); 631 noff = off; 632 } 633 nicmp6->icmp6_type = ICMP6_ECHO_REPLY; 634 nicmp6->icmp6_code = 0; 635 if (n) { 636 icmp6stat.icp6s_reflect++; 637 icmp6stat.icp6s_outhist[ICMP6_ECHO_REPLY]++; 638 icmp6_reflect(n, noff); 639 } 640 if (!m) 641 goto freeit; 642 break; 643 644 case ICMP6_ECHO_REPLY: 645 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echoreply); 646 if (code != 0) 647 goto badcode; 648 break; 649 650 case MLD_LISTENER_QUERY: 651 case MLD_LISTENER_REPORT: 652 if (icmp6len < sizeof(struct mld_hdr)) 653 goto badlen; 654 if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */ 655 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldquery); 656 else 657 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldreport); 658 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 659 /* give up local */ 660 mld6_input(m, off); 661 m = NULL; 662 goto freeit; 663 } 664 mld6_input(n, off); 665 /* m stays. */ 666 break; 667 668 case MLD_LISTENER_DONE: 669 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mlddone); 670 if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */ 671 goto badlen; 672 break; /* nothing to be done in kernel */ 673 674 case MLD_MTRACE_RESP: 675 case MLD_MTRACE: 676 /* XXX: these two are experimental. not officially defined. */ 677 /* XXX: per-interface statistics? */ 678 break; /* just pass it to applications */ 679 680 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */ 681 { 682 enum { WRU, FQDN } mode; 683 684 if (!icmp6_nodeinfo) 685 break; 686 687 if (icmp6len == sizeof(struct icmp6_hdr) + 4) 688 mode = WRU; 689 else if (icmp6len >= sizeof(struct icmp6_nodeinfo)) 690 mode = FQDN; 691 else 692 goto badlen; 693 694 if (mode == FQDN) { 695 n = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 696 if (n) 697 n = ni6_input(n, off); 698 /* XXX meaningless if n == NULL */ 699 noff = sizeof(struct ip6_hdr); 700 } else { 701 u_char *p; 702 int maxlen, maxhlen; 703 704 if ((icmp6_nodeinfo & 5) != 5) 705 break; 706 707 if (code != 0) 708 goto badcode; 709 maxlen = sizeof(*nip6) + sizeof(*nicmp6) + 4; 710 if (maxlen >= MCLBYTES) { 711 /* Give up remote */ 712 break; 713 } 714 MGETHDR(n, M_DONTWAIT, m->m_type); 715 if (n && maxlen > MHLEN) { 716 MCLGET(n, M_DONTWAIT); 717 if ((n->m_flags & M_EXT) == 0) { 718 m_free(n); 719 n = NULL; 720 } 721 } 722 if (n == NULL) { 723 /* Give up remote */ 724 break; 725 } 726 n->m_pkthdr.rcvif = NULL; 727 n->m_len = 0; 728 maxhlen = M_TRAILINGSPACE(n) - maxlen; 729 if (maxhlen > hostnamelen) 730 maxhlen = hostnamelen; 731 /* 732 * Copy IPv6 and ICMPv6 only. 733 */ 734 nip6 = mtod(n, struct ip6_hdr *); 735 bcopy(ip6, nip6, sizeof(struct ip6_hdr)); 736 nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 737 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); 738 p = (u_char *)(nicmp6 + 1); 739 bzero(p, 4); 740 bcopy(hostname, p + 4, maxhlen); /* meaningless TTL */ 741 noff = sizeof(struct ip6_hdr); 742 M_COPY_PKTHDR(n, m); /* just for rcvif */ 743 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 744 sizeof(struct icmp6_hdr) + 4 + maxhlen; 745 nicmp6->icmp6_type = ICMP6_WRUREPLY; 746 nicmp6->icmp6_code = 0; 747 } 748 #undef hostnamelen 749 if (n) { 750 icmp6stat.icp6s_reflect++; 751 icmp6stat.icp6s_outhist[ICMP6_WRUREPLY]++; 752 icmp6_reflect(n, noff); 753 } 754 break; 755 } 756 757 case ICMP6_WRUREPLY: 758 if (code != 0) 759 goto badcode; 760 break; 761 762 case ND_ROUTER_SOLICIT: 763 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routersolicit); 764 if (code != 0) 765 goto badcode; 766 if (icmp6len < sizeof(struct nd_router_solicit)) 767 goto badlen; 768 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 769 /* give up local */ 770 nd6_rs_input(m, off, icmp6len); 771 m = NULL; 772 goto freeit; 773 } 774 nd6_rs_input(n, off, icmp6len); 775 /* m stays. */ 776 break; 777 778 case ND_ROUTER_ADVERT: 779 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routeradvert); 780 if (code != 0) 781 goto badcode; 782 if (icmp6len < sizeof(struct nd_router_advert)) 783 goto badlen; 784 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 785 /* give up local */ 786 nd6_ra_input(m, off, icmp6len); 787 m = NULL; 788 goto freeit; 789 } 790 nd6_ra_input(n, off, icmp6len); 791 /* m stays. */ 792 break; 793 794 case ND_NEIGHBOR_SOLICIT: 795 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighborsolicit); 796 if (code != 0) 797 goto badcode; 798 if (icmp6len < sizeof(struct nd_neighbor_solicit)) 799 goto badlen; 800 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 801 /* give up local */ 802 nd6_ns_input(m, off, icmp6len); 803 m = NULL; 804 goto freeit; 805 } 806 nd6_ns_input(n, off, icmp6len); 807 /* m stays. */ 808 break; 809 810 case ND_NEIGHBOR_ADVERT: 811 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighboradvert); 812 if (code != 0) 813 goto badcode; 814 if (icmp6len < sizeof(struct nd_neighbor_advert)) 815 goto badlen; 816 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 817 /* give up local */ 818 nd6_na_input(m, off, icmp6len); 819 m = NULL; 820 goto freeit; 821 } 822 nd6_na_input(n, off, icmp6len); 823 /* m stays. */ 824 break; 825 826 case ND_REDIRECT: 827 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_redirect); 828 if (code != 0) 829 goto badcode; 830 if (icmp6len < sizeof(struct nd_redirect)) 831 goto badlen; 832 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 833 /* give up local */ 834 icmp6_redirect_input(m, off); 835 m = NULL; 836 goto freeit; 837 } 838 icmp6_redirect_input(n, off); 839 /* m stays. */ 840 break; 841 842 case ICMP6_ROUTER_RENUMBERING: 843 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND && 844 code != ICMP6_ROUTER_RENUMBERING_RESULT) 845 goto badcode; 846 if (icmp6len < sizeof(struct icmp6_router_renum)) 847 goto badlen; 848 break; 849 850 default: 851 nd6log((LOG_DEBUG, 852 "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n", 853 icmp6->icmp6_type, ip6_sprintf(&ip6->ip6_src), 854 ip6_sprintf(&ip6->ip6_dst), 855 m->m_pkthdr.rcvif ? m->m_pkthdr.rcvif->if_index : 0)); 856 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) { 857 /* ICMPv6 error: MUST deliver it by spec... */ 858 code = PRC_NCMDS; 859 /* deliver */ 860 } else { 861 /* ICMPv6 informational: MUST not deliver */ 862 break; 863 } 864 deliver: 865 if (icmp6_notify_error(m, off, icmp6len, code)) { 866 /* In this case, m should've been freed. */ 867 return (IPPROTO_DONE); 868 } 869 break; 870 871 badcode: 872 icmp6stat.icp6s_badcode++; 873 break; 874 875 badlen: 876 icmp6stat.icp6s_badlen++; 877 break; 878 } 879 880 /* deliver the packet to appropriate sockets */ 881 icmp6_rip6_input(&m, *offp); 882 883 return IPPROTO_DONE; 884 885 freeit: 886 m_freem(m); 887 return IPPROTO_DONE; 888 } 889 890 static int 891 icmp6_notify_error(m, off, icmp6len, code) 892 struct mbuf *m; 893 int off, icmp6len; 894 { 895 struct icmp6_hdr *icmp6; 896 struct ip6_hdr *eip6; 897 u_int32_t notifymtu; 898 struct sockaddr_in6 icmp6src, icmp6dst; 899 900 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) { 901 icmp6stat.icp6s_tooshort++; 902 goto freeit; 903 } 904 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 905 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 906 if (icmp6 == NULL) { 907 icmp6stat.icp6s_tooshort++; 908 return (-1); 909 } 910 eip6 = (struct ip6_hdr *)(icmp6 + 1); 911 912 /* Detect the upper level protocol */ 913 { 914 void (*ctlfunc) __P((int, struct sockaddr *, void *)); 915 u_int8_t nxt = eip6->ip6_nxt; 916 int eoff = off + sizeof(struct icmp6_hdr) + 917 sizeof(struct ip6_hdr); 918 struct ip6ctlparam ip6cp; 919 struct in6_addr *finaldst = NULL; 920 int icmp6type = icmp6->icmp6_type; 921 struct ip6_frag *fh; 922 struct ip6_rthdr *rth; 923 struct ip6_rthdr0 *rth0; 924 int rthlen; 925 926 while (1) { /* XXX: should avoid infinite loop explicitly? */ 927 struct ip6_ext *eh; 928 929 switch (nxt) { 930 case IPPROTO_HOPOPTS: 931 case IPPROTO_DSTOPTS: 932 case IPPROTO_AH: 933 IP6_EXTHDR_GET(eh, struct ip6_ext *, m, 934 eoff, sizeof(*eh)); 935 if (eh == NULL) { 936 icmp6stat.icp6s_tooshort++; 937 return (-1); 938 } 939 940 if (nxt == IPPROTO_AH) 941 eoff += (eh->ip6e_len + 2) << 2; 942 else 943 eoff += (eh->ip6e_len + 1) << 3; 944 nxt = eh->ip6e_nxt; 945 break; 946 case IPPROTO_ROUTING: 947 /* 948 * When the erroneous packet contains a 949 * routing header, we should examine the 950 * header to determine the final destination. 951 * Otherwise, we can't properly update 952 * information that depends on the final 953 * destination (e.g. path MTU). 954 */ 955 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m, 956 eoff, sizeof(*rth)); 957 if (rth == NULL) { 958 icmp6stat.icp6s_tooshort++; 959 return (-1); 960 } 961 rthlen = (rth->ip6r_len + 1) << 3; 962 /* 963 * XXX: currently there is no 964 * officially defined type other 965 * than type-0. 966 * Note that if the segment left field 967 * is 0, all intermediate hops must 968 * have been passed. 969 */ 970 if (rth->ip6r_segleft && 971 rth->ip6r_type == IPV6_RTHDR_TYPE_0) { 972 int hops; 973 974 IP6_EXTHDR_GET(rth0, 975 struct ip6_rthdr0 *, m, 976 eoff, rthlen); 977 if (rth0 == NULL) { 978 icmp6stat.icp6s_tooshort++; 979 return (-1); 980 } 981 /* just ignore a bogus header */ 982 if ((rth0->ip6r0_len % 2) == 0 && 983 (hops = rth0->ip6r0_len/2)) 984 finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1); 985 } 986 eoff += rthlen; 987 nxt = rth->ip6r_nxt; 988 break; 989 case IPPROTO_FRAGMENT: 990 IP6_EXTHDR_GET(fh, struct ip6_frag *, m, 991 eoff, sizeof(*fh)); 992 if (fh == NULL) { 993 icmp6stat.icp6s_tooshort++; 994 return (-1); 995 } 996 /* 997 * Data after a fragment header is meaningless 998 * unless it is the first fragment, but 999 * we'll go to the notify label for path MTU 1000 * discovery. 1001 */ 1002 if (fh->ip6f_offlg & IP6F_OFF_MASK) 1003 goto notify; 1004 1005 eoff += sizeof(struct ip6_frag); 1006 nxt = fh->ip6f_nxt; 1007 break; 1008 default: 1009 /* 1010 * This case includes ESP and the No Next 1011 * Header. In such cases going to the notify 1012 * label does not have any meaning 1013 * (i.e. ctlfunc will be NULL), but we go 1014 * anyway since we might have to update 1015 * path MTU information. 1016 */ 1017 goto notify; 1018 } 1019 } 1020 notify: 1021 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 1022 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 1023 if (icmp6 == NULL) { 1024 icmp6stat.icp6s_tooshort++; 1025 return (-1); 1026 } 1027 1028 eip6 = (struct ip6_hdr *)(icmp6 + 1); 1029 bzero(&icmp6dst, sizeof(icmp6dst)); 1030 icmp6dst.sin6_len = sizeof(struct sockaddr_in6); 1031 icmp6dst.sin6_family = AF_INET6; 1032 if (finaldst == NULL) 1033 icmp6dst.sin6_addr = eip6->ip6_dst; 1034 else 1035 icmp6dst.sin6_addr = *finaldst; 1036 icmp6dst.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif, 1037 &icmp6dst.sin6_addr); 1038 #ifndef SCOPEDROUTING 1039 if (in6_embedscope(&icmp6dst.sin6_addr, &icmp6dst, 1040 NULL, NULL)) { 1041 /* should be impossbile */ 1042 nd6log((LOG_DEBUG, 1043 "icmp6_notify_error: in6_embedscope failed\n")); 1044 goto freeit; 1045 } 1046 #endif 1047 1048 /* 1049 * retrieve parameters from the inner IPv6 header, and convert 1050 * them into sockaddr structures. 1051 */ 1052 bzero(&icmp6src, sizeof(icmp6src)); 1053 icmp6src.sin6_len = sizeof(struct sockaddr_in6); 1054 icmp6src.sin6_family = AF_INET6; 1055 icmp6src.sin6_addr = eip6->ip6_src; 1056 icmp6src.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif, 1057 &icmp6src.sin6_addr); 1058 #ifndef SCOPEDROUTING 1059 if (in6_embedscope(&icmp6src.sin6_addr, &icmp6src, 1060 NULL, NULL)) { 1061 /* should be impossbile */ 1062 nd6log((LOG_DEBUG, 1063 "icmp6_notify_error: in6_embedscope failed\n")); 1064 goto freeit; 1065 } 1066 #endif 1067 icmp6src.sin6_flowinfo = 1068 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK); 1069 1070 if (finaldst == NULL) 1071 finaldst = &eip6->ip6_dst; 1072 ip6cp.ip6c_m = m; 1073 ip6cp.ip6c_icmp6 = icmp6; 1074 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1); 1075 ip6cp.ip6c_off = eoff; 1076 ip6cp.ip6c_finaldst = finaldst; 1077 ip6cp.ip6c_src = &icmp6src; 1078 ip6cp.ip6c_nxt = nxt; 1079 1080 if (icmp6type == ICMP6_PACKET_TOO_BIG) { 1081 notifymtu = ntohl(icmp6->icmp6_mtu); 1082 ip6cp.ip6c_cmdarg = (void *)¬ifymtu; 1083 } 1084 1085 ctlfunc = (void (*) __P((int, struct sockaddr *, void *))) 1086 (inet6sw[ip6_protox[nxt]].pr_ctlinput); 1087 if (ctlfunc) { 1088 (void) (*ctlfunc)(code, (struct sockaddr *)&icmp6dst, 1089 &ip6cp); 1090 } 1091 } 1092 return (0); 1093 1094 freeit: 1095 m_freem(m); 1096 return (-1); 1097 } 1098 1099 void 1100 icmp6_mtudisc_update(ip6cp, validated) 1101 struct ip6ctlparam *ip6cp; 1102 int validated; 1103 { 1104 unsigned long rtcount; 1105 struct icmp6_mtudisc_callback *mc; 1106 struct in6_addr *dst = ip6cp->ip6c_finaldst; 1107 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6; 1108 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */ 1109 u_int mtu = ntohl(icmp6->icmp6_mtu); 1110 struct rtentry *rt = NULL; 1111 struct sockaddr_in6 sin6; 1112 1113 /* 1114 * The MTU should not be less than the minimal IPv6 MTU except for the 1115 * hack in ip6_output/ip6_setpmtu where we always include a frag header. 1116 * In that one case, the MTU might be less than 1280. 1117 */ 1118 if (__predict_false(mtu < IPV6_MMTU - sizeof(struct ip6_frag))) { 1119 /* is the mtu even sane? */ 1120 if (mtu < sizeof(struct ip6_hdr) + sizeof(struct ip6_frag) + 8) 1121 return; 1122 if (!validated) 1123 return; 1124 mtu = IPV6_MMTU - sizeof(struct ip6_frag); 1125 } 1126 1127 /* 1128 * allow non-validated cases if memory is plenty, to make traffic 1129 * from non-connected pcb happy. 1130 */ 1131 rtcount = rt_timer_count(icmp6_mtudisc_timeout_q); 1132 if (validated) { 1133 if (0 <= icmp6_mtudisc_hiwat && rtcount > icmp6_mtudisc_hiwat) 1134 return; 1135 else if (0 <= icmp6_mtudisc_lowat && 1136 rtcount > icmp6_mtudisc_lowat) { 1137 /* 1138 * XXX nuke a victim, install the new one. 1139 */ 1140 } 1141 } else { 1142 if (0 <= icmp6_mtudisc_lowat && rtcount > icmp6_mtudisc_lowat) 1143 return; 1144 } 1145 1146 bzero(&sin6, sizeof(sin6)); 1147 sin6.sin6_family = PF_INET6; 1148 sin6.sin6_len = sizeof(struct sockaddr_in6); 1149 sin6.sin6_addr = *dst; 1150 /* XXX normally, this won't happen */ 1151 if (IN6_IS_ADDR_LINKLOCAL(dst)) { 1152 sin6.sin6_addr.s6_addr16[1] = 1153 htons(m->m_pkthdr.rcvif->if_index); 1154 } 1155 /* sin6.sin6_scope_id = XXX: should be set if DST is a scoped addr */ 1156 rt = icmp6_mtudisc_clone((struct sockaddr *)&sin6); 1157 1158 if (rt && (rt->rt_flags & RTF_HOST) && 1159 !(rt->rt_rmx.rmx_locks & RTV_MTU) && 1160 (rt->rt_rmx.rmx_mtu > mtu || rt->rt_rmx.rmx_mtu == 0)) { 1161 if (mtu < IN6_LINKMTU(rt->rt_ifp)) { 1162 icmp6stat.icp6s_pmtuchg++; 1163 rt->rt_rmx.rmx_mtu = mtu; 1164 } 1165 } 1166 if (rt) { /* XXX: need braces to avoid conflict with else in RTFREE. */ 1167 RTFREE(rt); 1168 } 1169 1170 /* 1171 * Notify protocols that the MTU for this destination 1172 * has changed. 1173 */ 1174 for (mc = LIST_FIRST(&icmp6_mtudisc_callbacks); mc != NULL; 1175 mc = LIST_NEXT(mc, mc_list)) 1176 (*mc->mc_func)(&sin6.sin6_addr); 1177 } 1178 1179 /* 1180 * Process a Node Information Query packet, based on 1181 * draft-ietf-ipngwg-icmp-name-lookups-07. 1182 * 1183 * Spec incompatibilities: 1184 * - IPv6 Subject address handling 1185 * - IPv4 Subject address handling support missing 1186 * - Proxy reply (answer even if it's not for me) 1187 * - joins NI group address at in6_ifattach() time only, does not cope 1188 * with hostname changes by sethostname(3) 1189 */ 1190 #ifndef offsetof /* XXX */ 1191 #define offsetof(type, member) ((size_t)(&((type *)0)->member)) 1192 #endif 1193 static struct mbuf * 1194 ni6_input(m, off) 1195 struct mbuf *m; 1196 int off; 1197 { 1198 struct icmp6_nodeinfo *ni6, *nni6; 1199 struct mbuf *n = NULL; 1200 u_int16_t qtype; 1201 int subjlen; 1202 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1203 struct ni_reply_fqdn *fqdn; 1204 int addrs; /* for NI_QTYPE_NODEADDR */ 1205 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */ 1206 struct sockaddr_in6 sin6; /* double meaning; ip6_dst and subjectaddr */ 1207 struct ip6_hdr *ip6; 1208 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */ 1209 char *subj = NULL; 1210 1211 ip6 = mtod(m, struct ip6_hdr *); 1212 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6)); 1213 if (ni6 == NULL) { 1214 /* m is already reclaimed */ 1215 return NULL; 1216 } 1217 1218 /* 1219 * Validate IPv6 destination address. 1220 * 1221 * The Responder must discard the Query without further processing 1222 * unless it is one of the Responder's unicast or anycast addresses, or 1223 * a link-local scope multicast address which the Responder has joined. 1224 * [icmp-name-lookups-07, Section 4.] 1225 */ 1226 bzero(&sin6, sizeof(sin6)); 1227 sin6.sin6_family = AF_INET6; 1228 sin6.sin6_len = sizeof(struct sockaddr_in6); 1229 bcopy(&ip6->ip6_dst, &sin6.sin6_addr, sizeof(sin6.sin6_addr)); 1230 /* XXX scopeid */ 1231 if (ifa_ifwithaddr((struct sockaddr *)&sin6)) 1232 ; /* unicast/anycast, fine */ 1233 else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr)) 1234 ; /* link-local multicast, fine */ 1235 else 1236 goto bad; 1237 1238 /* validate query Subject field. */ 1239 qtype = ntohs(ni6->ni_qtype); 1240 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo); 1241 switch (qtype) { 1242 case NI_QTYPE_NOOP: 1243 case NI_QTYPE_SUPTYPES: 1244 /* 07 draft */ 1245 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0) 1246 break; 1247 /* FALLTHROUGH */ 1248 case NI_QTYPE_FQDN: 1249 case NI_QTYPE_NODEADDR: 1250 switch (ni6->ni_code) { 1251 case ICMP6_NI_SUBJ_IPV6: 1252 #if ICMP6_NI_SUBJ_IPV6 != 0 1253 case 0: 1254 #endif 1255 /* 1256 * backward compatibility - try to accept 03 draft 1257 * format, where no Subject is present. 1258 */ 1259 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 && 1260 subjlen == 0) { 1261 oldfqdn++; 1262 break; 1263 } 1264 #if ICMP6_NI_SUBJ_IPV6 != 0 1265 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6) 1266 goto bad; 1267 #endif 1268 1269 if (subjlen != sizeof(sin6.sin6_addr)) 1270 goto bad; 1271 1272 /* 1273 * Validate Subject address. 1274 * 1275 * Not sure what exactly "address belongs to the node" 1276 * means in the spec, is it just unicast, or what? 1277 * 1278 * At this moment we consider Subject address as 1279 * "belong to the node" if the Subject address equals 1280 * to the IPv6 destination address; validation for 1281 * IPv6 destination address should have done enough 1282 * check for us. 1283 * 1284 * We do not do proxy at this moment. 1285 */ 1286 /* m_pulldown instead of copy? */ 1287 m_copydata(m, off + sizeof(struct icmp6_nodeinfo), 1288 subjlen, (caddr_t)&sin6.sin6_addr); 1289 /* XXX kame scope hack */ 1290 if (IN6_IS_SCOPE_LINKLOCAL(&sin6.sin6_addr)) { 1291 if ((m->m_flags & M_PKTHDR) != 0 && 1292 m->m_pkthdr.rcvif) { 1293 sin6.sin6_addr.s6_addr16[1] = 1294 htons(m->m_pkthdr.rcvif->if_index); 1295 } 1296 } 1297 subj = (char *)&sin6; 1298 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &sin6.sin6_addr)) 1299 break; 1300 1301 /* 1302 * XXX if we are to allow other cases, we should really 1303 * be careful about scope here. 1304 * basically, we should disallow queries toward IPv6 1305 * destination X with subject Y, if scope(X) > scope(Y). 1306 * if we allow scope(X) > scope(Y), it will result in 1307 * information leakage across scope boundary. 1308 */ 1309 goto bad; 1310 1311 case ICMP6_NI_SUBJ_FQDN: 1312 /* 1313 * Validate Subject name with gethostname(3). 1314 * 1315 * The behavior may need some debate, since: 1316 * - we are not sure if the node has FQDN as 1317 * hostname (returned by gethostname(3)). 1318 * - the code does wildcard match for truncated names. 1319 * however, we are not sure if we want to perform 1320 * wildcard match, if gethostname(3) side has 1321 * truncated hostname. 1322 */ 1323 n = ni6_nametodns(hostname, hostnamelen, 0); 1324 if (!n || n->m_next || n->m_len == 0) 1325 goto bad; 1326 IP6_EXTHDR_GET(subj, char *, m, 1327 off + sizeof(struct icmp6_nodeinfo), subjlen); 1328 if (subj == NULL) 1329 goto bad; 1330 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *), 1331 n->m_len)) { 1332 goto bad; 1333 } 1334 m_freem(n); 1335 n = NULL; 1336 break; 1337 1338 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */ 1339 default: 1340 goto bad; 1341 } 1342 break; 1343 } 1344 1345 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */ 1346 switch (qtype) { 1347 case NI_QTYPE_FQDN: 1348 if ((icmp6_nodeinfo & 1) == 0) 1349 goto bad; 1350 break; 1351 case NI_QTYPE_NODEADDR: 1352 if ((icmp6_nodeinfo & 2) == 0) 1353 goto bad; 1354 break; 1355 } 1356 1357 /* guess reply length */ 1358 switch (qtype) { 1359 case NI_QTYPE_NOOP: 1360 break; /* no reply data */ 1361 case NI_QTYPE_SUPTYPES: 1362 replylen += sizeof(u_int32_t); 1363 break; 1364 case NI_QTYPE_FQDN: 1365 /* XXX will append an mbuf */ 1366 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1367 break; 1368 case NI_QTYPE_NODEADDR: 1369 addrs = ni6_addrs(ni6, m, &ifp, subj); 1370 if ((replylen += addrs * (sizeof(struct in6_addr) + 1371 sizeof(u_int32_t))) > MCLBYTES) 1372 replylen = MCLBYTES; /* XXX: will truncate pkt later */ 1373 break; 1374 default: 1375 /* 1376 * XXX: We must return a reply with the ICMP6 code 1377 * `unknown Qtype' in this case. However we regard the case 1378 * as an FQDN query for backward compatibility. 1379 * Older versions set a random value to this field, 1380 * so it rarely varies in the defined qtypes. 1381 * But the mechanism is not reliable... 1382 * maybe we should obsolete older versions. 1383 */ 1384 qtype = NI_QTYPE_FQDN; 1385 /* XXX will append an mbuf */ 1386 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1387 oldfqdn++; 1388 break; 1389 } 1390 1391 /* allocate an mbuf to reply. */ 1392 MGETHDR(n, M_DONTWAIT, m->m_type); 1393 if (n == NULL) { 1394 m_freem(m); 1395 return (NULL); 1396 } 1397 M_COPY_PKTHDR(n, m); /* just for rcvif */ 1398 if (replylen > MHLEN) { 1399 if (replylen > MCLBYTES) { 1400 /* 1401 * XXX: should we try to allocate more? But MCLBYTES 1402 * is probably much larger than IPV6_MMTU... 1403 */ 1404 goto bad; 1405 } 1406 MCLGET(n, M_DONTWAIT); 1407 if ((n->m_flags & M_EXT) == 0) { 1408 goto bad; 1409 } 1410 } 1411 n->m_pkthdr.len = n->m_len = replylen; 1412 1413 /* copy mbuf header and IPv6 + Node Information base headers */ 1414 bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr)); 1415 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1); 1416 bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo)); 1417 1418 /* qtype dependent procedure */ 1419 switch (qtype) { 1420 case NI_QTYPE_NOOP: 1421 nni6->ni_code = ICMP6_NI_SUCCESS; 1422 nni6->ni_flags = 0; 1423 break; 1424 case NI_QTYPE_SUPTYPES: 1425 { 1426 u_int32_t v; 1427 nni6->ni_code = ICMP6_NI_SUCCESS; 1428 nni6->ni_flags = htons(0x0000); /* raw bitmap */ 1429 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */ 1430 v = (u_int32_t)htonl(0x0000000f); 1431 bcopy(&v, nni6 + 1, sizeof(u_int32_t)); 1432 break; 1433 } 1434 case NI_QTYPE_FQDN: 1435 nni6->ni_code = ICMP6_NI_SUCCESS; 1436 fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) + 1437 sizeof(struct ip6_hdr) + 1438 sizeof(struct icmp6_nodeinfo)); 1439 nni6->ni_flags = 0; /* XXX: meaningless TTL */ 1440 fqdn->ni_fqdn_ttl = 0; /* ditto. */ 1441 /* 1442 * XXX do we really have FQDN in variable "hostname"? 1443 */ 1444 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn); 1445 if (n->m_next == NULL) 1446 goto bad; 1447 /* XXX we assume that n->m_next is not a chain */ 1448 if (n->m_next->m_next != NULL) 1449 goto bad; 1450 n->m_pkthdr.len += n->m_next->m_len; 1451 break; 1452 case NI_QTYPE_NODEADDR: 1453 { 1454 int lenlim, copied; 1455 1456 nni6->ni_code = ICMP6_NI_SUCCESS; 1457 n->m_pkthdr.len = n->m_len = 1458 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1459 lenlim = M_TRAILINGSPACE(n); 1460 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim); 1461 /* XXX: reset mbuf length */ 1462 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 1463 sizeof(struct icmp6_nodeinfo) + copied; 1464 break; 1465 } 1466 default: 1467 break; /* XXX impossible! */ 1468 } 1469 1470 nni6->ni_type = ICMP6_NI_REPLY; 1471 m_freem(m); 1472 return (n); 1473 1474 bad: 1475 m_freem(m); 1476 if (n) 1477 m_freem(n); 1478 return (NULL); 1479 } 1480 #undef hostnamelen 1481 1482 #define isupper(x) ('A' <= (x) && (x) <= 'Z') 1483 #define isalpha(x) (('A' <= (x) && (x) <= 'Z') || ('a' <= (x) && (x) <= 'z')) 1484 #define isalnum(x) (isalpha(x) || ('' <= (x) && (x) <= '9')) 1485 #define tolower(x) (isupper(x) ? (x) + 'a' - 'A' : (x)) 1486 1487 /* 1488 * make a mbuf with DNS-encoded string. no compression support. 1489 * 1490 * XXX names with less than 2 dots (like "foo" or "foo.section") will be 1491 * treated as truncated name (two \0 at the end). this is a wild guess. 1492 */ 1493 static struct mbuf * 1494 ni6_nametodns(name, namelen, old) 1495 const char *name; 1496 int namelen; 1497 int old; /* return pascal string if non-zero */ 1498 { 1499 struct mbuf *m; 1500 char *cp, *ep; 1501 const char *p, *q; 1502 int i, len, nterm; 1503 1504 if (old) 1505 len = namelen + 1; 1506 else 1507 len = MCLBYTES; 1508 1509 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */ 1510 MGET(m, M_DONTWAIT, MT_DATA); 1511 if (m && len > MLEN) { 1512 MCLGET(m, M_DONTWAIT); 1513 if ((m->m_flags & M_EXT) == 0) 1514 goto fail; 1515 } 1516 if (!m) 1517 goto fail; 1518 m->m_next = NULL; 1519 1520 if (old) { 1521 m->m_len = len; 1522 *mtod(m, char *) = namelen; 1523 bcopy(name, mtod(m, char *) + 1, namelen); 1524 return m; 1525 } else { 1526 m->m_len = 0; 1527 cp = mtod(m, char *); 1528 ep = mtod(m, char *) + M_TRAILINGSPACE(m); 1529 1530 /* if not certain about my name, return empty buffer */ 1531 if (namelen == 0) 1532 return m; 1533 1534 /* 1535 * guess if it looks like shortened hostname, or FQDN. 1536 * shortened hostname needs two trailing "\0". 1537 */ 1538 i = 0; 1539 for (p = name; p < name + namelen; p++) { 1540 if (*p && *p == '.') 1541 i++; 1542 } 1543 if (i < 2) 1544 nterm = 2; 1545 else 1546 nterm = 1; 1547 1548 p = name; 1549 while (cp < ep && p < name + namelen) { 1550 i = 0; 1551 for (q = p; q < name + namelen && *q && *q != '.'; q++) 1552 i++; 1553 /* result does not fit into mbuf */ 1554 if (cp + i + 1 >= ep) 1555 goto fail; 1556 /* 1557 * DNS label length restriction, RFC1035 page 8. 1558 * "i == 0" case is included here to avoid returning 1559 * 0-length label on "foo..bar". 1560 */ 1561 if (i <= 0 || i >= 64) 1562 goto fail; 1563 *cp++ = i; 1564 if (!isalpha(p[0]) || !isalnum(p[i - 1])) 1565 goto fail; 1566 while (i > 0) { 1567 if (!isalnum(*p) && *p != '-') 1568 goto fail; 1569 if (isupper(*p)) { 1570 *cp++ = tolower(*p); 1571 p++; 1572 } else 1573 *cp++ = *p++; 1574 i--; 1575 } 1576 p = q; 1577 if (p < name + namelen && *p == '.') 1578 p++; 1579 } 1580 /* termination */ 1581 if (cp + nterm >= ep) 1582 goto fail; 1583 while (nterm-- > 0) 1584 *cp++ = '\0'; 1585 m->m_len = cp - mtod(m, char *); 1586 return m; 1587 } 1588 1589 panic("should not reach here"); 1590 /* NOTREACHED */ 1591 1592 fail: 1593 if (m) 1594 m_freem(m); 1595 return NULL; 1596 } 1597 1598 /* 1599 * check if two DNS-encoded string matches. takes care of truncated 1600 * form (with \0\0 at the end). no compression support. 1601 * XXX upper/lowercase match (see RFC2065) 1602 */ 1603 static int 1604 ni6_dnsmatch(a, alen, b, blen) 1605 const char *a; 1606 int alen; 1607 const char *b; 1608 int blen; 1609 { 1610 const char *a0, *b0; 1611 int l; 1612 1613 /* simplest case - need validation? */ 1614 if (alen == blen && bcmp(a, b, alen) == 0) 1615 return 1; 1616 1617 a0 = a; 1618 b0 = b; 1619 1620 /* termination is mandatory */ 1621 if (alen < 2 || blen < 2) 1622 return 0; 1623 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0') 1624 return 0; 1625 alen--; 1626 blen--; 1627 1628 while (a - a0 < alen && b - b0 < blen) { 1629 if (a - a0 + 1 > alen || b - b0 + 1 > blen) 1630 return 0; 1631 1632 if ((signed char)a[0] < 0 || (signed char)b[0] < 0) 1633 return 0; 1634 /* we don't support compression yet */ 1635 if (a[0] >= 64 || b[0] >= 64) 1636 return 0; 1637 1638 /* truncated case */ 1639 if (a[0] == 0 && a - a0 == alen - 1) 1640 return 1; 1641 if (b[0] == 0 && b - b0 == blen - 1) 1642 return 1; 1643 if (a[0] == 0 || b[0] == 0) 1644 return 0; 1645 1646 if (a[0] != b[0]) 1647 return 0; 1648 l = a[0]; 1649 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen) 1650 return 0; 1651 if (bcmp(a + 1, b + 1, l) != 0) 1652 return 0; 1653 1654 a += 1 + l; 1655 b += 1 + l; 1656 } 1657 1658 if (a - a0 == alen && b - b0 == blen) 1659 return 1; 1660 else 1661 return 0; 1662 } 1663 1664 /* 1665 * calculate the number of addresses to be returned in the node info reply. 1666 */ 1667 static int 1668 ni6_addrs(ni6, m, ifpp, subj) 1669 struct icmp6_nodeinfo *ni6; 1670 struct mbuf *m; 1671 struct ifnet **ifpp; 1672 char *subj; 1673 { 1674 struct ifnet *ifp; 1675 struct in6_ifaddr *ifa6; 1676 struct ifaddr *ifa; 1677 struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */ 1678 int addrs = 0, addrsofif, iffound = 0; 1679 int niflags = ni6->ni_flags; 1680 1681 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) { 1682 switch (ni6->ni_code) { 1683 case ICMP6_NI_SUBJ_IPV6: 1684 if (subj == NULL) /* must be impossible... */ 1685 return (0); 1686 subj_ip6 = (struct sockaddr_in6 *)subj; 1687 break; 1688 default: 1689 /* 1690 * XXX: we only support IPv6 subject address for 1691 * this Qtype. 1692 */ 1693 return (0); 1694 } 1695 } 1696 1697 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) 1698 { 1699 addrsofif = 0; 1700 for (ifa = ifp->if_addrlist.tqh_first; ifa; 1701 ifa = ifa->ifa_list.tqe_next) 1702 { 1703 if (ifa->ifa_addr->sa_family != AF_INET6) 1704 continue; 1705 ifa6 = (struct in6_ifaddr *)ifa; 1706 1707 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 && 1708 IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr, 1709 &ifa6->ia_addr.sin6_addr)) 1710 iffound = 1; 1711 1712 /* 1713 * IPv4-mapped addresses can only be returned by a 1714 * Node Information proxy, since they represent 1715 * addresses of IPv4-only nodes, which perforce do 1716 * not implement this protocol. 1717 * [icmp-name-lookups-07, Section 5.4] 1718 * So we don't support NI_NODEADDR_FLAG_COMPAT in 1719 * this function at this moment. 1720 */ 1721 1722 /* What do we have to do about ::1? */ 1723 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) { 1724 case IPV6_ADDR_SCOPE_LINKLOCAL: 1725 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1726 continue; 1727 break; 1728 case IPV6_ADDR_SCOPE_SITELOCAL: 1729 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1730 continue; 1731 break; 1732 case IPV6_ADDR_SCOPE_GLOBAL: 1733 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1734 continue; 1735 break; 1736 default: 1737 continue; 1738 } 1739 1740 /* 1741 * check if anycast is okay. 1742 * XXX: just experimental. not in the spec. 1743 */ 1744 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1745 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 1746 continue; /* we need only unicast addresses */ 1747 1748 addrsofif++; /* count the address */ 1749 } 1750 if (iffound) { 1751 *ifpp = ifp; 1752 return (addrsofif); 1753 } 1754 1755 addrs += addrsofif; 1756 } 1757 1758 return (addrs); 1759 } 1760 1761 static int 1762 ni6_store_addrs(ni6, nni6, ifp0, resid) 1763 struct icmp6_nodeinfo *ni6, *nni6; 1764 struct ifnet *ifp0; 1765 int resid; 1766 { 1767 struct ifnet *ifp = ifp0 ? ifp0 : TAILQ_FIRST(&ifnet); 1768 struct in6_ifaddr *ifa6; 1769 struct ifaddr *ifa; 1770 struct ifnet *ifp_dep = NULL; 1771 int copied = 0, allow_deprecated = 0; 1772 u_char *cp = (u_char *)(nni6 + 1); 1773 int niflags = ni6->ni_flags; 1774 u_int32_t ltime; 1775 1776 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL)) 1777 return (0); /* needless to copy */ 1778 1779 again: 1780 1781 for (; ifp; ifp = TAILQ_NEXT(ifp, if_list)) 1782 { 1783 for (ifa = ifp->if_addrlist.tqh_first; ifa; 1784 ifa = ifa->ifa_list.tqe_next) 1785 { 1786 if (ifa->ifa_addr->sa_family != AF_INET6) 1787 continue; 1788 ifa6 = (struct in6_ifaddr *)ifa; 1789 1790 if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) != 0 && 1791 allow_deprecated == 0) { 1792 /* 1793 * prefererred address should be put before 1794 * deprecated addresses. 1795 */ 1796 1797 /* record the interface for later search */ 1798 if (ifp_dep == NULL) 1799 ifp_dep = ifp; 1800 1801 continue; 1802 } 1803 else if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) == 0 && 1804 allow_deprecated != 0) 1805 continue; /* we now collect deprecated addrs */ 1806 1807 /* What do we have to do about ::1? */ 1808 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) { 1809 case IPV6_ADDR_SCOPE_LINKLOCAL: 1810 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1811 continue; 1812 break; 1813 case IPV6_ADDR_SCOPE_SITELOCAL: 1814 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1815 continue; 1816 break; 1817 case IPV6_ADDR_SCOPE_GLOBAL: 1818 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1819 continue; 1820 break; 1821 default: 1822 continue; 1823 } 1824 1825 /* 1826 * check if anycast is okay. 1827 * XXX: just experimental. not in the spec. 1828 */ 1829 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1830 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 1831 continue; 1832 1833 /* now we can copy the address */ 1834 if (resid < sizeof(struct in6_addr) + 1835 sizeof(u_int32_t)) { 1836 /* 1837 * We give up much more copy. 1838 * Set the truncate flag and return. 1839 */ 1840 nni6->ni_flags |= 1841 NI_NODEADDR_FLAG_TRUNCATE; 1842 return (copied); 1843 } 1844 1845 /* 1846 * Set the TTL of the address. 1847 * The TTL value should be one of the following 1848 * according to the specification: 1849 * 1850 * 1. The remaining lifetime of a DHCP lease on the 1851 * address, or 1852 * 2. The remaining Valid Lifetime of a prefix from 1853 * which the address was derived through Stateless 1854 * Autoconfiguration. 1855 * 1856 * Note that we currently do not support stateful 1857 * address configuration by DHCPv6, so the former 1858 * case can't happen. 1859 * 1860 * TTL must be 2^31 > TTL >= 0. 1861 */ 1862 if (ifa6->ia6_lifetime.ia6t_expire == 0) 1863 ltime = ND6_INFINITE_LIFETIME; 1864 else { 1865 if (ifa6->ia6_lifetime.ia6t_expire > 1866 time.tv_sec) 1867 ltime = ifa6->ia6_lifetime.ia6t_expire - time.tv_sec; 1868 else 1869 ltime = 0; 1870 } 1871 if (ltime > 0x7fffffff) 1872 ltime = 0x7fffffff; 1873 ltime = htonl(ltime); 1874 1875 bcopy(<ime, cp, sizeof(u_int32_t)); 1876 cp += sizeof(u_int32_t); 1877 1878 /* copy the address itself */ 1879 bcopy(&ifa6->ia_addr.sin6_addr, cp, 1880 sizeof(struct in6_addr)); 1881 /* XXX: KAME link-local hack; remove ifindex */ 1882 if (IN6_IS_ADDR_LINKLOCAL(&ifa6->ia_addr.sin6_addr)) 1883 ((struct in6_addr *)cp)->s6_addr16[1] = 0; 1884 cp += sizeof(struct in6_addr); 1885 1886 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1887 copied += (sizeof(struct in6_addr) + 1888 sizeof(u_int32_t)); 1889 } 1890 if (ifp0) /* we need search only on the specified IF */ 1891 break; 1892 } 1893 1894 if (allow_deprecated == 0 && ifp_dep != NULL) { 1895 ifp = ifp_dep; 1896 allow_deprecated = 1; 1897 1898 goto again; 1899 } 1900 1901 return (copied); 1902 } 1903 1904 /* 1905 * XXX almost dup'ed code with rip6_input. 1906 */ 1907 static int 1908 icmp6_rip6_input(mp, off) 1909 struct mbuf **mp; 1910 int off; 1911 { 1912 struct mbuf *m = *mp; 1913 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1914 struct inpcb_hdr *inph; 1915 struct in6pcb *in6p; 1916 struct in6pcb *last = NULL; 1917 struct sockaddr_in6 rip6src; 1918 struct icmp6_hdr *icmp6; 1919 struct mbuf *opts = NULL; 1920 1921 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 1922 if (icmp6 == NULL) { 1923 /* m is already reclaimed */ 1924 return IPPROTO_DONE; 1925 } 1926 1927 bzero(&rip6src, sizeof(rip6src)); 1928 rip6src.sin6_len = sizeof(struct sockaddr_in6); 1929 rip6src.sin6_family = AF_INET6; 1930 /* KAME hack: recover scopeid */ 1931 (void)in6_recoverscope(&rip6src, &ip6->ip6_src, m->m_pkthdr.rcvif); 1932 1933 CIRCLEQ_FOREACH(inph, &raw6cbtable.inpt_queue, inph_queue) { 1934 in6p = (struct in6pcb *)inph; 1935 if (in6p->in6p_af != AF_INET6) 1936 continue; 1937 if (in6p->in6p_ip6.ip6_nxt != IPPROTO_ICMPV6) 1938 continue; 1939 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && 1940 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst)) 1941 continue; 1942 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) && 1943 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src)) 1944 continue; 1945 if (in6p->in6p_icmp6filt 1946 && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type, 1947 in6p->in6p_icmp6filt)) 1948 continue; 1949 if (last) { 1950 struct mbuf *n; 1951 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { 1952 if (last->in6p_flags & IN6P_CONTROLOPTS) 1953 ip6_savecontrol(last, &opts, ip6, n); 1954 /* strip intermediate headers */ 1955 m_adj(n, off); 1956 if (sbappendaddr(&last->in6p_socket->so_rcv, 1957 (struct sockaddr *)&rip6src, 1958 n, opts) == 0) { 1959 /* should notify about lost packet */ 1960 m_freem(n); 1961 if (opts) 1962 m_freem(opts); 1963 } else 1964 sorwakeup(last->in6p_socket); 1965 opts = NULL; 1966 } 1967 } 1968 last = in6p; 1969 } 1970 if (last) { 1971 if (last->in6p_flags & IN6P_CONTROLOPTS) 1972 ip6_savecontrol(last, &opts, ip6, m); 1973 /* strip intermediate headers */ 1974 m_adj(m, off); 1975 if (sbappendaddr(&last->in6p_socket->so_rcv, 1976 (struct sockaddr *)&rip6src, m, opts) == 0) { 1977 m_freem(m); 1978 if (opts) 1979 m_freem(opts); 1980 } else 1981 sorwakeup(last->in6p_socket); 1982 } else { 1983 m_freem(m); 1984 ip6stat.ip6s_delivered--; 1985 } 1986 return IPPROTO_DONE; 1987 } 1988 1989 /* 1990 * Reflect the ip6 packet back to the source. 1991 * OFF points to the icmp6 header, counted from the top of the mbuf. 1992 * 1993 * Note: RFC 1885 required that an echo reply should be truncated if it 1994 * did not fit in with (return) path MTU, and KAME code supported the 1995 * behavior. However, as a clarification after the RFC, this limitation 1996 * was removed in a revised version of the spec, RFC 2463. We had kept the 1997 * old behavior, with a (non-default) ifdef block, while the new version of 1998 * the spec was an internet-draft status, and even after the new RFC was 1999 * published. But it would rather make sense to clean the obsoleted part 2000 * up, and to make the code simpler at this stage. 2001 */ 2002 void 2003 icmp6_reflect(m, off) 2004 struct mbuf *m; 2005 size_t off; 2006 { 2007 struct ip6_hdr *ip6; 2008 struct icmp6_hdr *icmp6; 2009 struct in6_ifaddr *ia; 2010 struct in6_addr t, *src = 0; 2011 int plen; 2012 int type, code; 2013 struct ifnet *outif = NULL; 2014 struct sockaddr_in6 sa6_src, sa6_dst; 2015 2016 /* too short to reflect */ 2017 if (off < sizeof(struct ip6_hdr)) { 2018 nd6log((LOG_DEBUG, 2019 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n", 2020 (u_long)off, (u_long)sizeof(struct ip6_hdr), 2021 __FILE__, __LINE__)); 2022 goto bad; 2023 } 2024 2025 /* 2026 * If there are extra headers between IPv6 and ICMPv6, strip 2027 * off that header first. 2028 */ 2029 #ifdef DIAGNOSTIC 2030 if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN) 2031 panic("assumption failed in icmp6_reflect"); 2032 #endif 2033 if (off > sizeof(struct ip6_hdr)) { 2034 size_t l; 2035 struct ip6_hdr nip6; 2036 2037 l = off - sizeof(struct ip6_hdr); 2038 m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6); 2039 m_adj(m, l); 2040 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2041 if (m->m_len < l) { 2042 if ((m = m_pullup(m, l)) == NULL) 2043 return; 2044 } 2045 bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6)); 2046 } else /* off == sizeof(struct ip6_hdr) */ { 2047 size_t l; 2048 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2049 if (m->m_len < l) { 2050 if ((m = m_pullup(m, l)) == NULL) 2051 return; 2052 } 2053 } 2054 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr); 2055 ip6 = mtod(m, struct ip6_hdr *); 2056 ip6->ip6_nxt = IPPROTO_ICMPV6; 2057 icmp6 = (struct icmp6_hdr *)(ip6 + 1); 2058 type = icmp6->icmp6_type; /* keep type for statistics */ 2059 code = icmp6->icmp6_code; /* ditto. */ 2060 2061 t = ip6->ip6_dst; 2062 /* 2063 * ip6_input() drops a packet if its src is multicast. 2064 * So, the src is never multicast. 2065 */ 2066 ip6->ip6_dst = ip6->ip6_src; 2067 2068 /* 2069 * XXX: make sure to embed scope zone information, using 2070 * already embedded IDs or the received interface (if any). 2071 * Note that rcvif may be NULL. 2072 * TODO: scoped routing case (XXX). 2073 */ 2074 bzero(&sa6_src, sizeof(sa6_src)); 2075 sa6_src.sin6_family = AF_INET6; 2076 sa6_src.sin6_len = sizeof(sa6_src); 2077 sa6_src.sin6_addr = ip6->ip6_dst; 2078 in6_recoverscope(&sa6_src, &ip6->ip6_dst, m->m_pkthdr.rcvif); 2079 in6_embedscope(&sa6_src.sin6_addr, &sa6_src, NULL, NULL); 2080 ip6->ip6_dst = sa6_src.sin6_addr; 2081 2082 bzero(&sa6_dst, sizeof(sa6_dst)); 2083 sa6_dst.sin6_family = AF_INET6; 2084 sa6_dst.sin6_len = sizeof(sa6_dst); 2085 sa6_dst.sin6_addr = t; 2086 in6_recoverscope(&sa6_dst, &t, m->m_pkthdr.rcvif); 2087 in6_embedscope(&t, &sa6_dst, NULL, NULL); 2088 2089 /* 2090 * If the incoming packet was addressed directly to us (i.e. unicast), 2091 * use dst as the src for the reply. 2092 * The IN6_IFF_NOTREADY case would be VERY rare, but is possible 2093 * (for example) when we encounter an error while forwarding procedure 2094 * destined to a duplicated address of ours. 2095 */ 2096 for (ia = in6_ifaddr; ia; ia = ia->ia_next) 2097 if (IN6_ARE_ADDR_EQUAL(&t, &ia->ia_addr.sin6_addr) && 2098 (ia->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) { 2099 src = &t; 2100 break; 2101 } 2102 if (ia == NULL && IN6_IS_ADDR_LINKLOCAL(&t) && (m->m_flags & M_LOOP)) { 2103 /* 2104 * This is the case if the dst is our link-local address 2105 * and the sender is also ourselves. 2106 */ 2107 src = &t; 2108 } 2109 2110 if (src == 0) { 2111 int e; 2112 struct route_in6 ro; 2113 2114 /* 2115 * This case matches to multicasts, our anycast, or unicasts 2116 * that we do not own. Select a source address based on the 2117 * source address of the erroneous packet. 2118 */ 2119 bzero(&ro, sizeof(ro)); 2120 src = in6_selectsrc(&sa6_src, NULL, NULL, &ro, NULL, &e); 2121 if (ro.ro_rt) { /* XXX: see comments in icmp6_mtudisc_update */ 2122 RTFREE(ro.ro_rt); /* XXX: we could use this */ 2123 } 2124 if (src == NULL) { 2125 nd6log((LOG_DEBUG, 2126 "icmp6_reflect: source can't be determined: " 2127 "dst=%s, error=%d\n", 2128 ip6_sprintf(&sa6_src.sin6_addr), e)); 2129 goto bad; 2130 } 2131 } 2132 2133 ip6->ip6_src = *src; 2134 2135 ip6->ip6_flow = 0; 2136 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2137 ip6->ip6_vfc |= IPV6_VERSION; 2138 ip6->ip6_nxt = IPPROTO_ICMPV6; 2139 if (m->m_pkthdr.rcvif) { 2140 /* XXX: This may not be the outgoing interface */ 2141 ip6->ip6_hlim = ND_IFINFO(m->m_pkthdr.rcvif)->chlim; 2142 } else 2143 ip6->ip6_hlim = ip6_defhlim; 2144 2145 icmp6->icmp6_cksum = 0; 2146 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6, 2147 sizeof(struct ip6_hdr), plen); 2148 2149 /* 2150 * XXX option handling 2151 */ 2152 2153 m->m_flags &= ~(M_BCAST|M_MCAST); 2154 2155 /* 2156 * To avoid a "too big" situation at an intermediate router 2157 * and the path MTU discovery process, specify the IPV6_MINMTU flag. 2158 * Note that only echo and node information replies are affected, 2159 * since the length of ICMP6 errors is limited to the minimum MTU. 2160 */ 2161 if (ip6_output(m, NULL, NULL, IPV6_MINMTU, 2162 (struct ip6_moptions *)NULL, (struct socket *)NULL, &outif) != 0 2163 && outif) 2164 icmp6_ifstat_inc(outif, ifs6_out_error); 2165 2166 if (outif) 2167 icmp6_ifoutstat_inc(outif, type, code); 2168 2169 return; 2170 2171 bad: 2172 m_freem(m); 2173 return; 2174 } 2175 2176 void 2177 icmp6_fasttimo() 2178 { 2179 2180 mld6_fasttimeo(); 2181 } 2182 2183 static const char * 2184 icmp6_redirect_diag(src6, dst6, tgt6) 2185 struct in6_addr *src6; 2186 struct in6_addr *dst6; 2187 struct in6_addr *tgt6; 2188 { 2189 static char buf[1024]; 2190 snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)", 2191 ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6)); 2192 return buf; 2193 } 2194 2195 void 2196 icmp6_redirect_input(m, off) 2197 struct mbuf *m; 2198 int off; 2199 { 2200 struct ifnet *ifp = m->m_pkthdr.rcvif; 2201 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 2202 struct nd_redirect *nd_rd; 2203 int icmp6len = ntohs(ip6->ip6_plen); 2204 char *lladdr = NULL; 2205 int lladdrlen = 0; 2206 struct rtentry *rt = NULL; 2207 int is_router; 2208 int is_onlink; 2209 struct in6_addr src6 = ip6->ip6_src; 2210 struct in6_addr redtgt6; 2211 struct in6_addr reddst6; 2212 union nd_opts ndopts; 2213 2214 if (!ifp) 2215 return; 2216 2217 /* XXX if we are router, we don't update route by icmp6 redirect */ 2218 if (ip6_forwarding) 2219 goto freeit; 2220 if (!icmp6_rediraccept) 2221 goto freeit; 2222 2223 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len); 2224 if (nd_rd == NULL) { 2225 icmp6stat.icp6s_tooshort++; 2226 return; 2227 } 2228 redtgt6 = nd_rd->nd_rd_target; 2229 reddst6 = nd_rd->nd_rd_dst; 2230 2231 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 2232 redtgt6.s6_addr16[1] = htons(ifp->if_index); 2233 if (IN6_IS_ADDR_LINKLOCAL(&reddst6)) 2234 reddst6.s6_addr16[1] = htons(ifp->if_index); 2235 2236 /* validation */ 2237 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) { 2238 nd6log((LOG_ERR, 2239 "ICMP6 redirect sent from %s rejected; " 2240 "must be from linklocal\n", ip6_sprintf(&src6))); 2241 goto bad; 2242 } 2243 if (ip6->ip6_hlim != 255) { 2244 nd6log((LOG_ERR, 2245 "ICMP6 redirect sent from %s rejected; " 2246 "hlim=%d (must be 255)\n", 2247 ip6_sprintf(&src6), ip6->ip6_hlim)); 2248 goto bad; 2249 } 2250 { 2251 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */ 2252 struct sockaddr_in6 sin6; 2253 struct in6_addr *gw6; 2254 2255 bzero(&sin6, sizeof(sin6)); 2256 sin6.sin6_family = AF_INET6; 2257 sin6.sin6_len = sizeof(struct sockaddr_in6); 2258 bcopy(&reddst6, &sin6.sin6_addr, sizeof(reddst6)); 2259 rt = rtalloc1((struct sockaddr *)&sin6, 0); 2260 if (rt) { 2261 if (rt->rt_gateway == NULL || 2262 rt->rt_gateway->sa_family != AF_INET6) { 2263 nd6log((LOG_ERR, 2264 "ICMP6 redirect rejected; no route " 2265 "with inet6 gateway found for redirect dst: %s\n", 2266 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2267 RTFREE(rt); 2268 goto bad; 2269 } 2270 2271 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr); 2272 if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) { 2273 nd6log((LOG_ERR, 2274 "ICMP6 redirect rejected; " 2275 "not equal to gw-for-src=%s (must be same): " 2276 "%s\n", 2277 ip6_sprintf(gw6), 2278 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2279 RTFREE(rt); 2280 goto bad; 2281 } 2282 } else { 2283 nd6log((LOG_ERR, 2284 "ICMP6 redirect rejected; " 2285 "no route found for redirect dst: %s\n", 2286 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2287 goto bad; 2288 } 2289 RTFREE(rt); 2290 rt = NULL; 2291 } 2292 if (IN6_IS_ADDR_MULTICAST(&reddst6)) { 2293 nd6log((LOG_ERR, 2294 "ICMP6 redirect rejected; " 2295 "redirect dst must be unicast: %s\n", 2296 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2297 goto bad; 2298 } 2299 2300 is_router = is_onlink = 0; 2301 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 2302 is_router = 1; /* router case */ 2303 if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0) 2304 is_onlink = 1; /* on-link destination case */ 2305 if (!is_router && !is_onlink) { 2306 nd6log((LOG_ERR, 2307 "ICMP6 redirect rejected; " 2308 "neither router case nor onlink case: %s\n", 2309 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2310 goto bad; 2311 } 2312 /* validation passed */ 2313 2314 icmp6len -= sizeof(*nd_rd); 2315 nd6_option_init(nd_rd + 1, icmp6len, &ndopts); 2316 if (nd6_options(&ndopts) < 0) { 2317 nd6log((LOG_INFO, "icmp6_redirect_input: " 2318 "invalid ND option, rejected: %s\n", 2319 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2320 /* nd6_options have incremented stats */ 2321 goto freeit; 2322 } 2323 2324 if (ndopts.nd_opts_tgt_lladdr) { 2325 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 2326 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 2327 } 2328 2329 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 2330 nd6log((LOG_INFO, 2331 "icmp6_redirect_input: lladdrlen mismatch for %s " 2332 "(if %d, icmp6 packet %d): %s\n", 2333 ip6_sprintf(&redtgt6), ifp->if_addrlen, lladdrlen - 2, 2334 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2335 goto bad; 2336 } 2337 2338 /* RFC 2461 8.3 */ 2339 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT, 2340 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER); 2341 2342 if (!is_onlink) { /* better router case. perform rtredirect. */ 2343 /* perform rtredirect */ 2344 struct sockaddr_in6 sdst; 2345 struct sockaddr_in6 sgw; 2346 struct sockaddr_in6 ssrc; 2347 unsigned long rtcount; 2348 struct rtentry *newrt = NULL; 2349 2350 /* 2351 * do not install redirect route, if the number of entries 2352 * is too much (> hiwat). note that, the node (= host) will 2353 * work just fine even if we do not install redirect route 2354 * (there will be additional hops, though). 2355 */ 2356 rtcount = rt_timer_count(icmp6_redirect_timeout_q); 2357 if (0 <= icmp6_redirect_hiwat && rtcount > icmp6_redirect_hiwat) 2358 return; 2359 else if (0 <= icmp6_redirect_lowat && 2360 rtcount > icmp6_redirect_lowat) { 2361 /* 2362 * XXX nuke a victim, install the new one. 2363 */ 2364 } 2365 2366 bzero(&sdst, sizeof(sdst)); 2367 bzero(&sgw, sizeof(sgw)); 2368 bzero(&ssrc, sizeof(ssrc)); 2369 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6; 2370 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len = 2371 sizeof(struct sockaddr_in6); 2372 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr)); 2373 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2374 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr)); 2375 rtredirect((struct sockaddr *)&sdst, (struct sockaddr *)&sgw, 2376 (struct sockaddr *)NULL, RTF_GATEWAY | RTF_HOST, 2377 (struct sockaddr *)&ssrc, 2378 &newrt); 2379 2380 if (newrt) { 2381 (void)rt_timer_add(newrt, icmp6_redirect_timeout, 2382 icmp6_redirect_timeout_q); 2383 rtfree(newrt); 2384 } 2385 } 2386 /* finally update cached route in each socket via pfctlinput */ 2387 { 2388 struct sockaddr_in6 sdst; 2389 2390 bzero(&sdst, sizeof(sdst)); 2391 sdst.sin6_family = AF_INET6; 2392 sdst.sin6_len = sizeof(struct sockaddr_in6); 2393 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2394 pfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst); 2395 #ifdef IPSEC 2396 key_sa_routechange((struct sockaddr *)&sdst); 2397 #endif 2398 } 2399 2400 freeit: 2401 m_freem(m); 2402 return; 2403 2404 bad: 2405 icmp6stat.icp6s_badredirect++; 2406 m_freem(m); 2407 } 2408 2409 void 2410 icmp6_redirect_output(m0, rt) 2411 struct mbuf *m0; 2412 struct rtentry *rt; 2413 { 2414 struct ifnet *ifp; /* my outgoing interface */ 2415 struct in6_addr *ifp_ll6; 2416 struct in6_addr *nexthop; 2417 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */ 2418 struct mbuf *m = NULL; /* newly allocated one */ 2419 struct ip6_hdr *ip6; /* m as struct ip6_hdr */ 2420 struct nd_redirect *nd_rd; 2421 size_t maxlen; 2422 u_char *p; 2423 struct sockaddr_in6 src_sa; 2424 2425 icmp6_errcount(&icmp6stat.icp6s_outerrhist, ND_REDIRECT, 0); 2426 2427 /* if we are not router, we don't send icmp6 redirect */ 2428 if (!ip6_forwarding) 2429 goto fail; 2430 2431 /* sanity check */ 2432 if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp)) 2433 goto fail; 2434 2435 /* 2436 * Address check: 2437 * the source address must identify a neighbor, and 2438 * the destination address must not be a multicast address 2439 * [RFC 2461, sec 8.2] 2440 */ 2441 sip6 = mtod(m0, struct ip6_hdr *); 2442 bzero(&src_sa, sizeof(src_sa)); 2443 src_sa.sin6_family = AF_INET6; 2444 src_sa.sin6_len = sizeof(src_sa); 2445 src_sa.sin6_addr = sip6->ip6_src; 2446 /* we don't currently use sin6_scope_id, but eventually use it */ 2447 src_sa.sin6_scope_id = in6_addr2scopeid(ifp, &sip6->ip6_src); 2448 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0) 2449 goto fail; 2450 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst)) 2451 goto fail; /* what should we do here? */ 2452 2453 /* rate limit */ 2454 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0)) 2455 goto fail; 2456 2457 /* 2458 * Since we are going to append up to 1280 bytes (= IPV6_MMTU), 2459 * we almost always ask for an mbuf cluster for simplicity. 2460 * (MHLEN < IPV6_MMTU is almost always true) 2461 */ 2462 #if IPV6_MMTU >= MCLBYTES 2463 # error assumption failed about IPV6_MMTU and MCLBYTES 2464 #endif 2465 MGETHDR(m, M_DONTWAIT, MT_HEADER); 2466 if (m && IPV6_MMTU >= MHLEN) 2467 MCLGET(m, M_DONTWAIT); 2468 if (!m) 2469 goto fail; 2470 m->m_pkthdr.rcvif = NULL; 2471 m->m_len = 0; 2472 maxlen = M_TRAILINGSPACE(m); 2473 maxlen = min(IPV6_MMTU, maxlen); 2474 /* just for safety */ 2475 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) + 2476 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) { 2477 goto fail; 2478 } 2479 2480 { 2481 /* get ip6 linklocal address for ifp(my outgoing interface). */ 2482 struct in6_ifaddr *ia; 2483 if ((ia = in6ifa_ifpforlinklocal(ifp, 2484 IN6_IFF_NOTREADY| 2485 IN6_IFF_ANYCAST)) == NULL) 2486 goto fail; 2487 ifp_ll6 = &ia->ia_addr.sin6_addr; 2488 } 2489 2490 /* get ip6 linklocal address for the router. */ 2491 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) { 2492 struct sockaddr_in6 *sin6; 2493 sin6 = (struct sockaddr_in6 *)rt->rt_gateway; 2494 nexthop = &sin6->sin6_addr; 2495 if (!IN6_IS_ADDR_LINKLOCAL(nexthop)) 2496 nexthop = NULL; 2497 } else 2498 nexthop = NULL; 2499 2500 /* ip6 */ 2501 ip6 = mtod(m, struct ip6_hdr *); 2502 ip6->ip6_flow = 0; 2503 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2504 ip6->ip6_vfc |= IPV6_VERSION; 2505 /* ip6->ip6_plen will be set later */ 2506 ip6->ip6_nxt = IPPROTO_ICMPV6; 2507 ip6->ip6_hlim = 255; 2508 /* ip6->ip6_src must be linklocal addr for my outgoing if. */ 2509 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr)); 2510 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr)); 2511 2512 /* ND Redirect */ 2513 nd_rd = (struct nd_redirect *)(ip6 + 1); 2514 nd_rd->nd_rd_type = ND_REDIRECT; 2515 nd_rd->nd_rd_code = 0; 2516 nd_rd->nd_rd_reserved = 0; 2517 if (rt->rt_flags & RTF_GATEWAY) { 2518 /* 2519 * nd_rd->nd_rd_target must be a link-local address in 2520 * better router cases. 2521 */ 2522 if (!nexthop) 2523 goto fail; 2524 bcopy(nexthop, &nd_rd->nd_rd_target, 2525 sizeof(nd_rd->nd_rd_target)); 2526 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2527 sizeof(nd_rd->nd_rd_dst)); 2528 } else { 2529 /* make sure redtgt == reddst */ 2530 nexthop = &sip6->ip6_dst; 2531 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target, 2532 sizeof(nd_rd->nd_rd_target)); 2533 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2534 sizeof(nd_rd->nd_rd_dst)); 2535 } 2536 2537 p = (u_char *)(nd_rd + 1); 2538 2539 { 2540 /* target lladdr option */ 2541 struct rtentry *rt_nexthop = NULL; 2542 int len; 2543 struct sockaddr_dl *sdl; 2544 struct nd_opt_hdr *nd_opt; 2545 char *lladdr; 2546 2547 rt_nexthop = nd6_lookup(nexthop, 0, ifp); 2548 if (!rt_nexthop) 2549 goto nolladdropt; 2550 len = sizeof(*nd_opt) + ifp->if_addrlen; 2551 len = (len + 7) & ~7; /* round by 8 */ 2552 /* safety check */ 2553 if (len + (p - (u_char *)ip6) > maxlen) 2554 goto nolladdropt; 2555 if (!(rt_nexthop->rt_flags & RTF_GATEWAY) && 2556 (rt_nexthop->rt_flags & RTF_LLINFO) && 2557 (rt_nexthop->rt_gateway->sa_family == AF_LINK) && 2558 (sdl = (struct sockaddr_dl *)rt_nexthop->rt_gateway) && 2559 sdl->sdl_alen) { 2560 nd_opt = (struct nd_opt_hdr *)p; 2561 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 2562 nd_opt->nd_opt_len = len >> 3; 2563 lladdr = (char *)(nd_opt + 1); 2564 bcopy(LLADDR(sdl), lladdr, ifp->if_addrlen); 2565 p += len; 2566 } 2567 } 2568 nolladdropt:; 2569 2570 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2571 2572 /* just to be safe */ 2573 if (m0->m_flags & M_DECRYPTED) 2574 goto noredhdropt; 2575 if (p - (u_char *)ip6 > maxlen) 2576 goto noredhdropt; 2577 2578 { 2579 /* redirected header option */ 2580 int len; 2581 struct nd_opt_rd_hdr *nd_opt_rh; 2582 2583 /* 2584 * compute the maximum size for icmp6 redirect header option. 2585 * XXX room for auth header? 2586 */ 2587 len = maxlen - (p - (u_char *)ip6); 2588 len &= ~7; 2589 2590 /* 2591 * Redirected header option spec (RFC2461 4.6.3) talks nothing 2592 * about padding/truncate rule for the original IP packet. 2593 * From the discussion on IPv6imp in Feb 1999, 2594 * the consensus was: 2595 * - "attach as much as possible" is the goal 2596 * - pad if not aligned (original size can be guessed by 2597 * original ip6 header) 2598 * Following code adds the padding if it is simple enough, 2599 * and truncates if not. 2600 */ 2601 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) { 2602 /* not enough room, truncate */ 2603 m_adj(m0, (len - sizeof(*nd_opt_rh)) - 2604 m0->m_pkthdr.len); 2605 } else { 2606 /* 2607 * enough room, truncate if not aligned. 2608 * we don't pad here for simplicity. 2609 */ 2610 size_t extra; 2611 2612 extra = m0->m_pkthdr.len % 8; 2613 if (extra) { 2614 /* truncate */ 2615 m_adj(m0, -extra); 2616 } 2617 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh); 2618 } 2619 2620 nd_opt_rh = (struct nd_opt_rd_hdr *)p; 2621 bzero(nd_opt_rh, sizeof(*nd_opt_rh)); 2622 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER; 2623 nd_opt_rh->nd_opt_rh_len = len >> 3; 2624 p += sizeof(*nd_opt_rh); 2625 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2626 2627 /* connect m0 to m */ 2628 m->m_pkthdr.len += m0->m_pkthdr.len; 2629 m_cat(m, m0); 2630 m0 = NULL; 2631 } 2632 noredhdropt: 2633 if (m0) { 2634 m_freem(m0); 2635 m0 = NULL; 2636 } 2637 2638 if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_src)) 2639 sip6->ip6_src.s6_addr16[1] = 0; 2640 if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_dst)) 2641 sip6->ip6_dst.s6_addr16[1] = 0; 2642 #if 0 2643 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src)) 2644 ip6->ip6_src.s6_addr16[1] = 0; 2645 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) 2646 ip6->ip6_dst.s6_addr16[1] = 0; 2647 #endif 2648 if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_target)) 2649 nd_rd->nd_rd_target.s6_addr16[1] = 0; 2650 if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_dst)) 2651 nd_rd->nd_rd_dst.s6_addr16[1] = 0; 2652 2653 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 2654 2655 nd_rd->nd_rd_cksum = 0; 2656 nd_rd->nd_rd_cksum 2657 = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen)); 2658 2659 /* send the packet to outside... */ 2660 if (ip6_output(m, NULL, NULL, 0, 2661 (struct ip6_moptions *)NULL, (struct socket *)NULL, NULL) != 0) 2662 icmp6_ifstat_inc(ifp, ifs6_out_error); 2663 2664 icmp6_ifstat_inc(ifp, ifs6_out_msg); 2665 icmp6_ifstat_inc(ifp, ifs6_out_redirect); 2666 icmp6stat.icp6s_outhist[ND_REDIRECT]++; 2667 2668 return; 2669 2670 fail: 2671 if (m) 2672 m_freem(m); 2673 if (m0) 2674 m_freem(m0); 2675 } 2676 2677 /* 2678 * ICMPv6 socket option processing. 2679 */ 2680 int 2681 icmp6_ctloutput(op, so, level, optname, mp) 2682 int op; 2683 struct socket *so; 2684 int level, optname; 2685 struct mbuf **mp; 2686 { 2687 int error = 0; 2688 int optlen; 2689 struct in6pcb *in6p = sotoin6pcb(so); 2690 struct mbuf *m = *mp; 2691 2692 optlen = m ? m->m_len : 0; 2693 2694 if (level != IPPROTO_ICMPV6) { 2695 if (op == PRCO_SETOPT && m) 2696 (void)m_free(m); 2697 return EINVAL; 2698 } 2699 2700 switch (op) { 2701 case PRCO_SETOPT: 2702 switch (optname) { 2703 case ICMP6_FILTER: 2704 { 2705 struct icmp6_filter *p; 2706 2707 if (optlen != sizeof(*p)) { 2708 error = EMSGSIZE; 2709 break; 2710 } 2711 p = mtod(m, struct icmp6_filter *); 2712 if (!p || !in6p->in6p_icmp6filt) { 2713 error = EINVAL; 2714 break; 2715 } 2716 bcopy(p, in6p->in6p_icmp6filt, 2717 sizeof(struct icmp6_filter)); 2718 error = 0; 2719 break; 2720 } 2721 2722 default: 2723 error = ENOPROTOOPT; 2724 break; 2725 } 2726 if (m) 2727 (void)m_freem(m); 2728 break; 2729 2730 case PRCO_GETOPT: 2731 switch (optname) { 2732 case ICMP6_FILTER: 2733 { 2734 struct icmp6_filter *p; 2735 2736 if (!in6p->in6p_icmp6filt) { 2737 error = EINVAL; 2738 break; 2739 } 2740 *mp = m = m_get(M_WAIT, MT_SOOPTS); 2741 m->m_len = sizeof(struct icmp6_filter); 2742 p = mtod(m, struct icmp6_filter *); 2743 bcopy(in6p->in6p_icmp6filt, p, 2744 sizeof(struct icmp6_filter)); 2745 error = 0; 2746 break; 2747 } 2748 2749 default: 2750 error = ENOPROTOOPT; 2751 break; 2752 } 2753 break; 2754 } 2755 2756 return (error); 2757 } 2758 2759 /* 2760 * Perform rate limit check. 2761 * Returns 0 if it is okay to send the icmp6 packet. 2762 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate 2763 * limitation. 2764 * 2765 * XXX per-destination/type check necessary? 2766 */ 2767 static int 2768 icmp6_ratelimit(dst, type, code) 2769 const struct in6_addr *dst; /* not used at this moment */ 2770 const int type; /* not used at this moment */ 2771 const int code; /* not used at this moment */ 2772 { 2773 int ret; 2774 2775 ret = 0; /* okay to send */ 2776 2777 /* PPS limit */ 2778 if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count, 2779 icmp6errppslim)) { 2780 /* The packet is subject to rate limit */ 2781 ret++; 2782 } 2783 2784 return ret; 2785 } 2786 2787 static struct rtentry * 2788 icmp6_mtudisc_clone(dst) 2789 struct sockaddr *dst; 2790 { 2791 struct rtentry *rt; 2792 int error; 2793 2794 rt = rtalloc1(dst, 1); 2795 if (rt == 0) 2796 return NULL; 2797 2798 /* If we didn't get a host route, allocate one */ 2799 if ((rt->rt_flags & RTF_HOST) == 0) { 2800 struct rtentry *nrt; 2801 2802 error = rtrequest((int) RTM_ADD, dst, 2803 (struct sockaddr *) rt->rt_gateway, 2804 (struct sockaddr *) 0, 2805 RTF_GATEWAY | RTF_HOST | RTF_DYNAMIC, &nrt); 2806 if (error) { 2807 rtfree(rt); 2808 return NULL; 2809 } 2810 nrt->rt_rmx = rt->rt_rmx; 2811 rtfree(rt); 2812 rt = nrt; 2813 } 2814 error = rt_timer_add(rt, icmp6_mtudisc_timeout, 2815 icmp6_mtudisc_timeout_q); 2816 if (error) { 2817 rtfree(rt); 2818 return NULL; 2819 } 2820 2821 return rt; /* caller need to call rtfree() */ 2822 } 2823 2824 static void 2825 icmp6_mtudisc_timeout(rt, r) 2826 struct rtentry *rt; 2827 struct rttimer *r; 2828 { 2829 if (rt == NULL) 2830 panic("icmp6_mtudisc_timeout: bad route to timeout"); 2831 if ((rt->rt_flags & (RTF_DYNAMIC | RTF_HOST)) == 2832 (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 } else { 2836 if (!(rt->rt_rmx.rmx_locks & RTV_MTU)) 2837 rt->rt_rmx.rmx_mtu = 0; 2838 } 2839 } 2840 2841 static void 2842 icmp6_redirect_timeout(rt, r) 2843 struct rtentry *rt; 2844 struct rttimer *r; 2845 { 2846 if (rt == NULL) 2847 panic("icmp6_redirect_timeout: bad route to timeout"); 2848 if ((rt->rt_flags & (RTF_GATEWAY | RTF_DYNAMIC | RTF_HOST)) == 2849 (RTF_GATEWAY | RTF_DYNAMIC | RTF_HOST)) { 2850 rtrequest((int) RTM_DELETE, (struct sockaddr *)rt_key(rt), 2851 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0); 2852 } 2853 } 2854 2855 /* 2856 * sysctl helper routine for the net.inet6.icmp6.nd6 nodes. silly? 2857 */ 2858 static int 2859 sysctl_net_inet6_icmp6_nd6(SYSCTLFN_ARGS) 2860 { 2861 2862 if (namelen != 0) 2863 return (EINVAL); 2864 2865 return (nd6_sysctl(rnode->sysctl_num, oldp, oldlenp, 2866 (void*)newp, newlen)); 2867 } 2868 2869 SYSCTL_SETUP(sysctl_net_inet6_icmp6_setup, 2870 "sysctl net.inet6.icmp6 subtree setup") 2871 { 2872 2873 sysctl_createv(clog, 0, NULL, NULL, 2874 CTLFLAG_PERMANENT, 2875 CTLTYPE_NODE, "net", NULL, 2876 NULL, 0, NULL, 0, 2877 CTL_NET, CTL_EOL); 2878 sysctl_createv(clog, 0, NULL, NULL, 2879 CTLFLAG_PERMANENT, 2880 CTLTYPE_NODE, "inet6", NULL, 2881 NULL, 0, NULL, 0, 2882 CTL_NET, PF_INET6, CTL_EOL); 2883 sysctl_createv(clog, 0, NULL, NULL, 2884 CTLFLAG_PERMANENT, 2885 CTLTYPE_NODE, "icmp6", 2886 SYSCTL_DESCR("ICMPv6 related settings"), 2887 NULL, 0, NULL, 0, 2888 CTL_NET, PF_INET6, IPPROTO_ICMPV6, CTL_EOL); 2889 2890 sysctl_createv(clog, 0, NULL, NULL, 2891 CTLFLAG_PERMANENT, 2892 CTLTYPE_STRUCT, "stats", 2893 SYSCTL_DESCR("ICMPv6 transmission statistics"), 2894 NULL, 0, &icmp6stat, sizeof(icmp6stat), 2895 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2896 ICMPV6CTL_STATS, CTL_EOL); 2897 sysctl_createv(clog, 0, NULL, NULL, 2898 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2899 CTLTYPE_INT, "rediraccept", 2900 SYSCTL_DESCR("Accept and process redirect messages"), 2901 NULL, 0, &icmp6_rediraccept, 0, 2902 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2903 ICMPV6CTL_REDIRACCEPT, CTL_EOL); 2904 sysctl_createv(clog, 0, NULL, NULL, 2905 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2906 CTLTYPE_INT, "redirtimeout", 2907 SYSCTL_DESCR("Redirect generated route lifetime"), 2908 NULL, 0, &icmp6_redirtimeout, 0, 2909 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2910 ICMPV6CTL_REDIRTIMEOUT, CTL_EOL); 2911 #if 0 /* obsoleted */ 2912 sysctl_createv(clog, 0, NULL, NULL, 2913 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2914 CTLTYPE_INT, "errratelimit", NULL, 2915 NULL, 0, &icmp6_errratelimit, 0, 2916 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2917 ICMPV6CTL_ERRRATELIMIT, CTL_EOL); 2918 #endif 2919 sysctl_createv(clog, 0, NULL, NULL, 2920 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2921 CTLTYPE_INT, "nd6_prune", 2922 SYSCTL_DESCR("Neighbor discovery prune interval"), 2923 NULL, 0, &nd6_prune, 0, 2924 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2925 ICMPV6CTL_ND6_PRUNE, CTL_EOL); 2926 sysctl_createv(clog, 0, NULL, NULL, 2927 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2928 CTLTYPE_INT, "nd6_delay", 2929 SYSCTL_DESCR("First probe delay time"), 2930 NULL, 0, &nd6_delay, 0, 2931 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2932 ICMPV6CTL_ND6_DELAY, CTL_EOL); 2933 sysctl_createv(clog, 0, NULL, NULL, 2934 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2935 CTLTYPE_INT, "nd6_umaxtries", 2936 SYSCTL_DESCR("Number of unicast discovery attempts"), 2937 NULL, 0, &nd6_umaxtries, 0, 2938 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2939 ICMPV6CTL_ND6_UMAXTRIES, CTL_EOL); 2940 sysctl_createv(clog, 0, NULL, NULL, 2941 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2942 CTLTYPE_INT, "nd6_mmaxtries", 2943 SYSCTL_DESCR("Number of multicast discovery attempts"), 2944 NULL, 0, &nd6_mmaxtries, 0, 2945 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2946 ICMPV6CTL_ND6_MMAXTRIES, CTL_EOL); 2947 sysctl_createv(clog, 0, NULL, NULL, 2948 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2949 CTLTYPE_INT, "nd6_useloopback", 2950 SYSCTL_DESCR("Use loopback interface for local traffic"), 2951 NULL, 0, &nd6_useloopback, 0, 2952 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2953 ICMPV6CTL_ND6_USELOOPBACK, CTL_EOL); 2954 #if 0 /* obsoleted */ 2955 sysctl_createv(clog, 0, NULL, NULL, 2956 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2957 CTLTYPE_INT, "nd6_proxyall", NULL, 2958 NULL, 0, &nd6_proxyall, 0, 2959 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2960 ICMPV6CTL_ND6_PROXYALL, CTL_EOL); 2961 #endif 2962 sysctl_createv(clog, 0, NULL, NULL, 2963 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2964 CTLTYPE_INT, "nodeinfo", 2965 SYSCTL_DESCR("Respond to node information requests"), 2966 NULL, 0, &icmp6_nodeinfo, 0, 2967 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2968 ICMPV6CTL_NODEINFO, CTL_EOL); 2969 sysctl_createv(clog, 0, NULL, NULL, 2970 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2971 CTLTYPE_INT, "errppslimit", 2972 SYSCTL_DESCR("Maximum ICMP errors sent per second"), 2973 NULL, 0, &icmp6errppslim, 0, 2974 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2975 ICMPV6CTL_ERRPPSLIMIT, CTL_EOL); 2976 sysctl_createv(clog, 0, NULL, NULL, 2977 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2978 CTLTYPE_INT, "nd6_maxnudhint", 2979 SYSCTL_DESCR("Maximum neighbor unreachable hint count"), 2980 NULL, 0, &nd6_maxnudhint, 0, 2981 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2982 ICMPV6CTL_ND6_MAXNUDHINT, CTL_EOL); 2983 sysctl_createv(clog, 0, NULL, NULL, 2984 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2985 CTLTYPE_INT, "mtudisc_hiwat", 2986 SYSCTL_DESCR("Low mark on MTU Discovery route timers"), 2987 NULL, 0, &icmp6_mtudisc_hiwat, 0, 2988 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2989 ICMPV6CTL_MTUDISC_HIWAT, CTL_EOL); 2990 sysctl_createv(clog, 0, NULL, NULL, 2991 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2992 CTLTYPE_INT, "mtudisc_lowat", 2993 SYSCTL_DESCR("Low mark on MTU Discovery route timers"), 2994 NULL, 0, &icmp6_mtudisc_lowat, 0, 2995 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2996 ICMPV6CTL_MTUDISC_LOWAT, CTL_EOL); 2997 sysctl_createv(clog, 0, NULL, NULL, 2998 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2999 CTLTYPE_INT, "nd6_debug", 3000 SYSCTL_DESCR("Enable neighbor discovery debug output"), 3001 NULL, 0, &nd6_debug, 0, 3002 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3003 ICMPV6CTL_ND6_DEBUG, CTL_EOL); 3004 sysctl_createv(clog, 0, NULL, NULL, 3005 CTLFLAG_PERMANENT, 3006 CTLTYPE_STRUCT, "nd6_drlist", 3007 SYSCTL_DESCR("Default router list"), 3008 sysctl_net_inet6_icmp6_nd6, 0, NULL, 0, 3009 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3010 ICMPV6CTL_ND6_DRLIST, CTL_EOL); 3011 sysctl_createv(clog, 0, NULL, NULL, 3012 CTLFLAG_PERMANENT, 3013 CTLTYPE_STRUCT, "nd6_prlist", 3014 SYSCTL_DESCR("Prefix list"), 3015 sysctl_net_inet6_icmp6_nd6, 0, NULL, 0, 3016 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3017 ICMPV6CTL_ND6_PRLIST, CTL_EOL); 3018 }
Cache object: 4f491d49c26d18886adea4552c652024
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