1 /* $NetBSD: icmp6.c,v 1.196 2016/08/19 12:26:01 roy 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 1.196 2016/08/19 12:26:01 roy Exp $"); 66 67 #ifdef _KERNEL_OPT 68 #include "opt_inet.h" 69 #include "opt_ipsec.h" 70 #endif 71 72 #include <sys/param.h> 73 #include <sys/systm.h> 74 #include <sys/kmem.h> 75 #include <sys/mbuf.h> 76 #include <sys/protosw.h> 77 #include <sys/socket.h> 78 #include <sys/socketvar.h> 79 #include <sys/time.h> 80 #include <sys/kernel.h> 81 #include <sys/syslog.h> 82 #include <sys/domain.h> 83 #include <sys/sysctl.h> 84 85 #include <net/if.h> 86 #include <net/route.h> 87 #include <net/if_dl.h> 88 #include <net/if_types.h> 89 90 #include <netinet/in.h> 91 #include <netinet/in_var.h> 92 #include <netinet/ip6.h> 93 #include <netinet6/ip6_var.h> 94 #include <netinet6/ip6_private.h> 95 #include <netinet/icmp6.h> 96 #include <netinet6/icmp6_private.h> 97 #include <netinet6/mld6_var.h> 98 #include <netinet6/in6_pcb.h> 99 #include <netinet6/nd6.h> 100 #include <netinet6/in6_ifattach.h> 101 #include <netinet6/ip6protosw.h> 102 #include <netinet6/scope6_var.h> 103 104 #ifdef IPSEC 105 #include <netipsec/ipsec.h> 106 #include <netipsec/key.h> 107 #endif 108 109 110 #include "faith.h" 111 #if defined(NFAITH) && 0 < NFAITH 112 #include <net/if_faith.h> 113 #endif 114 115 #include <net/net_osdep.h> 116 117 extern struct domain inet6domain; 118 119 percpu_t *icmp6stat_percpu; 120 121 extern struct inpcbtable raw6cbtable; 122 extern int icmp6errppslim; 123 static int icmp6errpps_count = 0; 124 static struct timeval icmp6errppslim_last; 125 extern int icmp6_nodeinfo; 126 127 /* 128 * List of callbacks to notify when Path MTU changes are made. 129 */ 130 struct icmp6_mtudisc_callback { 131 LIST_ENTRY(icmp6_mtudisc_callback) mc_list; 132 void (*mc_func)(struct in6_addr *); 133 }; 134 135 LIST_HEAD(, icmp6_mtudisc_callback) icmp6_mtudisc_callbacks = 136 LIST_HEAD_INITIALIZER(&icmp6_mtudisc_callbacks); 137 138 static struct rttimer_queue *icmp6_mtudisc_timeout_q = NULL; 139 extern int pmtu_expire; 140 141 /* XXX do these values make any sense? */ 142 static int icmp6_mtudisc_hiwat = 1280; 143 static int icmp6_mtudisc_lowat = 256; 144 145 /* 146 * keep track of # of redirect routes. 147 */ 148 static struct rttimer_queue *icmp6_redirect_timeout_q = NULL; 149 150 /* XXX experimental, turned off */ 151 static int icmp6_redirect_hiwat = -1; 152 static int icmp6_redirect_lowat = -1; 153 154 static void icmp6_errcount(u_int, int, int); 155 static int icmp6_rip6_input(struct mbuf **, int); 156 static int icmp6_ratelimit(const struct in6_addr *, const int, const int); 157 static const char *icmp6_redirect_diag(struct in6_addr *, 158 struct in6_addr *, struct in6_addr *); 159 static struct mbuf *ni6_input(struct mbuf *, int); 160 static struct mbuf *ni6_nametodns(const char *, int, int); 161 static int ni6_dnsmatch(const char *, int, const char *, int); 162 static int ni6_addrs(struct icmp6_nodeinfo *, struct mbuf *, 163 struct ifnet **, char *, struct psref *); 164 static int ni6_store_addrs(struct icmp6_nodeinfo *, struct icmp6_nodeinfo *, 165 struct ifnet *, int); 166 static int icmp6_notify_error(struct mbuf *, int, int, int); 167 static struct rtentry *icmp6_mtudisc_clone(struct sockaddr *); 168 static void icmp6_mtudisc_timeout(struct rtentry *, struct rttimer *); 169 static void icmp6_redirect_timeout(struct rtentry *, struct rttimer *); 170 static void sysctl_net_inet6_icmp6_setup(struct sysctllog **); 171 172 173 void 174 icmp6_init(void) 175 { 176 177 sysctl_net_inet6_icmp6_setup(NULL); 178 mld_init(); 179 icmp6_mtudisc_timeout_q = rt_timer_queue_create(pmtu_expire); 180 icmp6_redirect_timeout_q = rt_timer_queue_create(icmp6_redirtimeout); 181 182 icmp6stat_percpu = percpu_alloc(sizeof(uint64_t) * ICMP6_NSTATS); 183 } 184 185 static void 186 icmp6_errcount(u_int base, int type, int code) 187 { 188 switch (type) { 189 case ICMP6_DST_UNREACH: 190 switch (code) { 191 case ICMP6_DST_UNREACH_NOROUTE: 192 ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_NOROUTE); 193 return; 194 case ICMP6_DST_UNREACH_ADMIN: 195 ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_ADMIN); 196 return; 197 case ICMP6_DST_UNREACH_BEYONDSCOPE: 198 ICMP6_STATINC(base + 199 ICMP6_ERRSTAT_DST_UNREACH_BEYONDSCOPE); 200 return; 201 case ICMP6_DST_UNREACH_ADDR: 202 ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_ADDR); 203 return; 204 case ICMP6_DST_UNREACH_NOPORT: 205 ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_NOPORT); 206 return; 207 } 208 break; 209 case ICMP6_PACKET_TOO_BIG: 210 ICMP6_STATINC(base + ICMP6_ERRSTAT_PACKET_TOO_BIG); 211 return; 212 case ICMP6_TIME_EXCEEDED: 213 switch (code) { 214 case ICMP6_TIME_EXCEED_TRANSIT: 215 ICMP6_STATINC(base + ICMP6_ERRSTAT_TIME_EXCEED_TRANSIT); 216 return; 217 case ICMP6_TIME_EXCEED_REASSEMBLY: 218 ICMP6_STATINC(base + 219 ICMP6_ERRSTAT_TIME_EXCEED_REASSEMBLY); 220 return; 221 } 222 break; 223 case ICMP6_PARAM_PROB: 224 switch (code) { 225 case ICMP6_PARAMPROB_HEADER: 226 ICMP6_STATINC(base + ICMP6_ERRSTAT_PARAMPROB_HEADER); 227 return; 228 case ICMP6_PARAMPROB_NEXTHEADER: 229 ICMP6_STATINC(base + 230 ICMP6_ERRSTAT_PARAMPROB_NEXTHEADER); 231 return; 232 case ICMP6_PARAMPROB_OPTION: 233 ICMP6_STATINC(base + ICMP6_ERRSTAT_PARAMPROB_OPTION); 234 return; 235 } 236 break; 237 case ND_REDIRECT: 238 ICMP6_STATINC(base + ICMP6_ERRSTAT_REDIRECT); 239 return; 240 } 241 ICMP6_STATINC(base + ICMP6_ERRSTAT_UNKNOWN); 242 } 243 244 /* 245 * Register a Path MTU Discovery callback. 246 */ 247 void 248 icmp6_mtudisc_callback_register(void (*func)(struct in6_addr *)) 249 { 250 struct icmp6_mtudisc_callback *mc; 251 252 for (mc = LIST_FIRST(&icmp6_mtudisc_callbacks); mc != NULL; 253 mc = LIST_NEXT(mc, mc_list)) { 254 if (mc->mc_func == func) 255 return; 256 } 257 258 mc = kmem_alloc(sizeof(*mc), KM_SLEEP); 259 mc->mc_func = func; 260 LIST_INSERT_HEAD(&icmp6_mtudisc_callbacks, mc, mc_list); 261 } 262 263 /* 264 * A wrapper function for icmp6_error() necessary when the erroneous packet 265 * may not contain enough scope zone information. 266 */ 267 void 268 icmp6_error2(struct mbuf *m, int type, int code, int param, 269 struct ifnet *ifp) 270 { 271 struct ip6_hdr *ip6; 272 273 if (ifp == NULL) 274 return; 275 276 if (m->m_len < sizeof(struct ip6_hdr)) { 277 m = m_pullup(m, sizeof(struct ip6_hdr)); 278 if (m == NULL) 279 return; 280 } 281 282 ip6 = mtod(m, struct ip6_hdr *); 283 284 if (in6_setscope(&ip6->ip6_src, ifp, NULL) != 0) 285 return; 286 if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0) 287 return; 288 289 icmp6_error(m, type, code, param); 290 } 291 292 /* 293 * Generate an error packet of type error in response to bad IP6 packet. 294 */ 295 void 296 icmp6_error(struct mbuf *m, int type, int code, int param) 297 { 298 struct ip6_hdr *oip6, *nip6; 299 struct icmp6_hdr *icmp6; 300 u_int preplen; 301 int off; 302 int nxt; 303 304 ICMP6_STATINC(ICMP6_STAT_ERROR); 305 306 /* count per-type-code statistics */ 307 icmp6_errcount(ICMP6_STAT_OUTERRHIST, type, code); 308 309 if (m->m_flags & M_DECRYPTED) { 310 ICMP6_STATINC(ICMP6_STAT_CANTERROR); 311 goto freeit; 312 } 313 314 if (M_UNWRITABLE(m, sizeof(struct ip6_hdr)) && 315 (m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) 316 return; 317 oip6 = mtod(m, struct ip6_hdr *); 318 319 /* 320 * If the destination address of the erroneous packet is a multicast 321 * address, or the packet was sent using link-layer multicast, 322 * we should basically suppress sending an error (RFC 2463, Section 323 * 2.4). 324 * We have two exceptions (the item e.2 in that section): 325 * - the Pakcet Too Big message can be sent for path MTU discovery. 326 * - the Parameter Problem Message that can be allowed an icmp6 error 327 * in the option type field. This check has been done in 328 * ip6_unknown_opt(), so we can just check the type and code. 329 */ 330 if ((m->m_flags & (M_BCAST|M_MCAST) || 331 IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) && 332 (type != ICMP6_PACKET_TOO_BIG && 333 (type != ICMP6_PARAM_PROB || 334 code != ICMP6_PARAMPROB_OPTION))) 335 goto freeit; 336 337 /* 338 * RFC 2463, 2.4 (e.5): source address check. 339 * XXX: the case of anycast source? 340 */ 341 if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) || 342 IN6_IS_ADDR_MULTICAST(&oip6->ip6_src)) 343 goto freeit; 344 345 /* 346 * If we are about to send ICMPv6 against ICMPv6 error/redirect, 347 * don't do it. 348 */ 349 nxt = -1; 350 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 351 if (off >= 0 && nxt == IPPROTO_ICMPV6) { 352 struct icmp6_hdr *icp; 353 354 IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off, 355 sizeof(*icp)); 356 if (icp == NULL) { 357 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 358 return; 359 } 360 if (icp->icmp6_type < ICMP6_ECHO_REQUEST || 361 icp->icmp6_type == ND_REDIRECT) { 362 /* 363 * ICMPv6 error 364 * Special case: for redirect (which is 365 * informational) we must not send icmp6 error. 366 */ 367 ICMP6_STATINC(ICMP6_STAT_CANTERROR); 368 goto freeit; 369 } else { 370 /* ICMPv6 informational - send the error */ 371 } 372 } 373 #if 0 /* controversial */ 374 else if (off >= 0 && nxt == IPPROTO_ESP) { 375 /* 376 * It could be ICMPv6 error inside ESP. Take a safer side, 377 * don't respond. 378 */ 379 ICMP6_STATINC(ICMP6_STAT_CANTERROR); 380 goto freeit; 381 } 382 #endif 383 else { 384 /* non-ICMPv6 - send the error */ 385 } 386 387 oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */ 388 389 /* Finally, do rate limitation check. */ 390 if (icmp6_ratelimit(&oip6->ip6_src, type, code)) { 391 ICMP6_STATINC(ICMP6_STAT_TOOFREQ); 392 goto freeit; 393 } 394 395 /* 396 * OK, ICMP6 can be generated. 397 */ 398 399 if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN) 400 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len); 401 402 preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 403 M_PREPEND(m, preplen, M_DONTWAIT); 404 if (m && M_UNWRITABLE(m, preplen)) 405 m = m_pullup(m, preplen); 406 if (m == NULL) { 407 nd6log(LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__); 408 return; 409 } 410 411 nip6 = mtod(m, struct ip6_hdr *); 412 nip6->ip6_src = oip6->ip6_src; 413 nip6->ip6_dst = oip6->ip6_dst; 414 415 in6_clearscope(&oip6->ip6_src); 416 in6_clearscope(&oip6->ip6_dst); 417 418 icmp6 = (struct icmp6_hdr *)(nip6 + 1); 419 icmp6->icmp6_type = type; 420 icmp6->icmp6_code = code; 421 icmp6->icmp6_pptr = htonl((u_int32_t)param); 422 423 /* 424 * icmp6_reflect() is designed to be in the input path. 425 * icmp6_error() can be called from both input and output path, 426 * and if we are in output path rcvif could contain bogus value. 427 * clear m->m_pkthdr.rcvif for safety, we should have enough scope 428 * information in ip header (nip6). 429 */ 430 m_reset_rcvif(m); 431 432 ICMP6_STATINC(ICMP6_STAT_OUTHIST + type); 433 icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */ 434 435 return; 436 437 freeit: 438 /* 439 * If we can't tell whether or not we can generate ICMP6, free it. 440 */ 441 m_freem(m); 442 } 443 444 /* 445 * Process a received ICMP6 message. 446 */ 447 int 448 icmp6_input(struct mbuf **mp, int *offp, int proto) 449 { 450 struct mbuf *m = *mp, *n; 451 struct ip6_hdr *ip6, *nip6; 452 struct icmp6_hdr *icmp6, *nicmp6; 453 int off = *offp; 454 int icmp6len = m->m_pkthdr.len - *offp; 455 int code, sum, noff; 456 struct ifnet *rcvif; 457 struct psref psref; 458 459 rcvif = m_get_rcvif_psref(m, &psref); 460 if (__predict_false(rcvif == NULL)) 461 goto freeit; 462 463 #define ICMP6_MAXLEN (sizeof(*nip6) + sizeof(*nicmp6) + 4) 464 KASSERT(ICMP6_MAXLEN < MCLBYTES); 465 icmp6_ifstat_inc(rcvif, ifs6_in_msg); 466 467 /* 468 * Locate icmp6 structure in mbuf, and check 469 * that not corrupted and of at least minimum length 470 */ 471 472 if (icmp6len < sizeof(struct icmp6_hdr)) { 473 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 474 icmp6_ifstat_inc(rcvif, ifs6_in_error); 475 goto freeit; 476 } 477 478 ip6 = mtod(m, struct ip6_hdr *); 479 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 480 if (icmp6 == NULL) { 481 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 482 icmp6_ifstat_inc(rcvif, ifs6_in_error); 483 goto freeit; 484 } 485 KASSERT(IP6_HDR_ALIGNED_P(icmp6)); 486 487 /* 488 * calculate the checksum 489 */ 490 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) { 491 nd6log(LOG_ERR, "ICMP6 checksum error(%d|%x) %s\n", 492 icmp6->icmp6_type, sum, ip6_sprintf(&ip6->ip6_src)); 493 ICMP6_STATINC(ICMP6_STAT_CHECKSUM); 494 icmp6_ifstat_inc(rcvif, ifs6_in_error); 495 goto freeit; 496 } 497 498 #if defined(NFAITH) && 0 < NFAITH 499 if (faithprefix(&ip6->ip6_dst)) { 500 /* 501 * Deliver very specific ICMP6 type only. 502 * This is important to deliver TOOBIG. Otherwise PMTUD 503 * will not work. 504 */ 505 switch (icmp6->icmp6_type) { 506 case ICMP6_DST_UNREACH: 507 case ICMP6_PACKET_TOO_BIG: 508 case ICMP6_TIME_EXCEEDED: 509 break; 510 default: 511 goto freeit; 512 } 513 } 514 #endif 515 516 code = icmp6->icmp6_code; 517 ICMP6_STATINC(ICMP6_STAT_INHIST + icmp6->icmp6_type); 518 519 switch (icmp6->icmp6_type) { 520 case ICMP6_DST_UNREACH: 521 icmp6_ifstat_inc(rcvif, ifs6_in_dstunreach); 522 switch (code) { 523 case ICMP6_DST_UNREACH_NOROUTE: 524 code = PRC_UNREACH_NET; 525 break; 526 case ICMP6_DST_UNREACH_ADMIN: 527 icmp6_ifstat_inc(rcvif, ifs6_in_adminprohib); 528 code = PRC_UNREACH_PROTOCOL; /* is this a good code? */ 529 break; 530 case ICMP6_DST_UNREACH_ADDR: 531 code = PRC_HOSTDEAD; 532 break; 533 #ifdef COMPAT_RFC1885 534 case ICMP6_DST_UNREACH_NOTNEIGHBOR: 535 code = PRC_UNREACH_SRCFAIL; 536 break; 537 #else 538 case ICMP6_DST_UNREACH_BEYONDSCOPE: 539 /* I mean "source address was incorrect." */ 540 code = PRC_UNREACH_NET; 541 break; 542 #endif 543 case ICMP6_DST_UNREACH_NOPORT: 544 code = PRC_UNREACH_PORT; 545 break; 546 default: 547 goto badcode; 548 } 549 goto deliver; 550 551 case ICMP6_PACKET_TOO_BIG: 552 icmp6_ifstat_inc(rcvif, ifs6_in_pkttoobig); 553 554 /* 555 * MTU is checked in icmp6_mtudisc. 556 */ 557 code = PRC_MSGSIZE; 558 559 /* 560 * Updating the path MTU will be done after examining 561 * intermediate extension headers. 562 */ 563 goto deliver; 564 565 case ICMP6_TIME_EXCEEDED: 566 icmp6_ifstat_inc(rcvif, ifs6_in_timeexceed); 567 switch (code) { 568 case ICMP6_TIME_EXCEED_TRANSIT: 569 code = PRC_TIMXCEED_INTRANS; 570 break; 571 case ICMP6_TIME_EXCEED_REASSEMBLY: 572 code = PRC_TIMXCEED_REASS; 573 break; 574 default: 575 goto badcode; 576 } 577 goto deliver; 578 579 case ICMP6_PARAM_PROB: 580 icmp6_ifstat_inc(rcvif, ifs6_in_paramprob); 581 switch (code) { 582 case ICMP6_PARAMPROB_NEXTHEADER: 583 code = PRC_UNREACH_PROTOCOL; 584 break; 585 case ICMP6_PARAMPROB_HEADER: 586 case ICMP6_PARAMPROB_OPTION: 587 code = PRC_PARAMPROB; 588 break; 589 default: 590 goto badcode; 591 } 592 goto deliver; 593 594 case ICMP6_ECHO_REQUEST: 595 icmp6_ifstat_inc(rcvif, ifs6_in_echo); 596 if (code != 0) 597 goto badcode; 598 /* 599 * Copy mbuf to send to two data paths: userland socket(s), 600 * and to the querier (echo reply). 601 * m: a copy for socket, n: a copy for querier 602 * 603 * If the first mbuf is shared, or the first mbuf is too short, 604 * copy the first part of the data into a fresh mbuf. 605 * Otherwise, we will wrongly overwrite both copies. 606 */ 607 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 608 /* Give up local */ 609 n = m; 610 m = NULL; 611 } else if (M_READONLY(n) || 612 n->m_len < off + sizeof(struct icmp6_hdr)) { 613 struct mbuf *n0 = n; 614 615 /* 616 * Prepare an internal mbuf. m_pullup() doesn't 617 * always copy the length we specified. 618 */ 619 if ((n = m_dup(n0, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 620 /* Give up local */ 621 n = m; 622 m = NULL; 623 } 624 m_freem(n0); 625 } 626 IP6_EXTHDR_GET(nicmp6, struct icmp6_hdr *, n, off, 627 sizeof(*nicmp6)); 628 if (nicmp6 == NULL) 629 goto freeit; 630 nicmp6->icmp6_type = ICMP6_ECHO_REPLY; 631 nicmp6->icmp6_code = 0; 632 if (n) { 633 uint64_t *icmp6s = ICMP6_STAT_GETREF(); 634 icmp6s[ICMP6_STAT_REFLECT]++; 635 icmp6s[ICMP6_STAT_OUTHIST + ICMP6_ECHO_REPLY]++; 636 ICMP6_STAT_PUTREF(); 637 icmp6_reflect(n, off); 638 } 639 if (!m) 640 goto freeit; 641 break; 642 643 case ICMP6_ECHO_REPLY: 644 icmp6_ifstat_inc(rcvif, ifs6_in_echoreply); 645 if (code != 0) 646 goto badcode; 647 break; 648 649 case MLD_LISTENER_QUERY: 650 case MLD_LISTENER_REPORT: 651 if (icmp6len < sizeof(struct mld_hdr)) 652 goto badlen; 653 if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */ 654 icmp6_ifstat_inc(rcvif, ifs6_in_mldquery); 655 else 656 icmp6_ifstat_inc(rcvif, ifs6_in_mldreport); 657 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 658 /* give up local */ 659 mld_input(m, off); 660 m = NULL; 661 goto freeit; 662 } 663 mld_input(n, off); 664 /* m stays. */ 665 break; 666 667 case MLD_LISTENER_DONE: 668 icmp6_ifstat_inc(rcvif, ifs6_in_mlddone); 669 if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */ 670 goto badlen; 671 break; /* nothing to be done in kernel */ 672 673 case MLD_MTRACE_RESP: 674 case MLD_MTRACE: 675 /* XXX: these two are experimental. not officially defined. */ 676 /* XXX: per-interface statistics? */ 677 break; /* just pass it to applications */ 678 679 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */ 680 { 681 enum { WRU, FQDN } mode; 682 683 if (!icmp6_nodeinfo) 684 break; 685 686 if (icmp6len == sizeof(struct icmp6_hdr) + 4) 687 mode = WRU; 688 else if (icmp6len >= sizeof(struct icmp6_nodeinfo)) 689 mode = FQDN; 690 else 691 goto badlen; 692 693 if (mode == FQDN) { 694 n = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 695 if (n) 696 n = ni6_input(n, off); 697 /* XXX meaningless if n == NULL */ 698 noff = sizeof(struct ip6_hdr); 699 } else { 700 u_char *p; 701 int maxhlen; 702 703 if ((icmp6_nodeinfo & 5) != 5) 704 break; 705 706 if (code != 0) 707 goto badcode; 708 MGETHDR(n, M_DONTWAIT, m->m_type); 709 if (n && ICMP6_MAXLEN > MHLEN) { 710 MCLGET(n, M_DONTWAIT); 711 if ((n->m_flags & M_EXT) == 0) { 712 m_free(n); 713 n = NULL; 714 } 715 } 716 if (n == NULL) { 717 /* Give up remote */ 718 break; 719 } 720 m_reset_rcvif(n); 721 n->m_len = 0; 722 maxhlen = M_TRAILINGSPACE(n) - ICMP6_MAXLEN; 723 if (maxhlen < 0) 724 break; 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 memset(p, 0, 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 uint64_t *icmp6s = ICMP6_STAT_GETREF(); 747 icmp6s[ICMP6_STAT_REFLECT]++; 748 icmp6s[ICMP6_STAT_OUTHIST + ICMP6_WRUREPLY]++; 749 ICMP6_STAT_PUTREF(); 750 icmp6_reflect(n, noff); 751 } 752 break; 753 } 754 755 case ICMP6_WRUREPLY: 756 if (code != 0) 757 goto badcode; 758 break; 759 760 case ND_ROUTER_SOLICIT: 761 icmp6_ifstat_inc(rcvif, ifs6_in_routersolicit); 762 if (code != 0) 763 goto badcode; 764 if (icmp6len < sizeof(struct nd_router_solicit)) 765 goto badlen; 766 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 767 /* give up local */ 768 nd6_rs_input(m, off, icmp6len); 769 m = NULL; 770 goto freeit; 771 } 772 nd6_rs_input(n, off, icmp6len); 773 /* m stays. */ 774 break; 775 776 case ND_ROUTER_ADVERT: 777 icmp6_ifstat_inc(rcvif, ifs6_in_routeradvert); 778 if (code != 0) 779 goto badcode; 780 if (icmp6len < sizeof(struct nd_router_advert)) 781 goto badlen; 782 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 783 /* give up local */ 784 nd6_ra_input(m, off, icmp6len); 785 m = NULL; 786 goto freeit; 787 } 788 nd6_ra_input(n, off, icmp6len); 789 /* m stays. */ 790 break; 791 792 case ND_NEIGHBOR_SOLICIT: 793 icmp6_ifstat_inc(rcvif, ifs6_in_neighborsolicit); 794 if (code != 0) 795 goto badcode; 796 if (icmp6len < sizeof(struct nd_neighbor_solicit)) 797 goto badlen; 798 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 799 /* give up local */ 800 nd6_ns_input(m, off, icmp6len); 801 m = NULL; 802 goto freeit; 803 } 804 nd6_ns_input(n, off, icmp6len); 805 /* m stays. */ 806 break; 807 808 case ND_NEIGHBOR_ADVERT: 809 icmp6_ifstat_inc(rcvif, ifs6_in_neighboradvert); 810 if (code != 0) 811 goto badcode; 812 if (icmp6len < sizeof(struct nd_neighbor_advert)) 813 goto badlen; 814 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 815 /* give up local */ 816 nd6_na_input(m, off, icmp6len); 817 m = NULL; 818 goto freeit; 819 } 820 nd6_na_input(n, off, icmp6len); 821 /* m stays. */ 822 break; 823 824 case ND_REDIRECT: 825 icmp6_ifstat_inc(rcvif, ifs6_in_redirect); 826 if (code != 0) 827 goto badcode; 828 if (icmp6len < sizeof(struct nd_redirect)) 829 goto badlen; 830 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 831 /* give up local */ 832 icmp6_redirect_input(m, off); 833 m = NULL; 834 goto freeit; 835 } 836 icmp6_redirect_input(n, off); 837 /* m stays. */ 838 break; 839 840 case ICMP6_ROUTER_RENUMBERING: 841 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND && 842 code != ICMP6_ROUTER_RENUMBERING_RESULT) 843 goto badcode; 844 if (icmp6len < sizeof(struct icmp6_router_renum)) 845 goto badlen; 846 break; 847 848 default: 849 nd6log(LOG_DEBUG, "unknown type %d(src=%s, dst=%s, ifid=%d)\n", 850 icmp6->icmp6_type, ip6_sprintf(&ip6->ip6_src), 851 ip6_sprintf(&ip6->ip6_dst), 852 rcvif ? rcvif->if_index : 0); 853 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) { 854 /* ICMPv6 error: MUST deliver it by spec... */ 855 code = PRC_NCMDS; 856 /* deliver */ 857 } else { 858 /* ICMPv6 informational: MUST not deliver */ 859 break; 860 } 861 deliver: 862 if (icmp6_notify_error(m, off, icmp6len, code)) { 863 /* In this case, m should've been freed. */ 864 m_put_rcvif_psref(rcvif, &psref); 865 return (IPPROTO_DONE); 866 } 867 break; 868 869 badcode: 870 ICMP6_STATINC(ICMP6_STAT_BADCODE); 871 break; 872 873 badlen: 874 ICMP6_STATINC(ICMP6_STAT_BADLEN); 875 break; 876 } 877 m_put_rcvif_psref(rcvif, &psref); 878 879 /* deliver the packet to appropriate sockets */ 880 icmp6_rip6_input(&m, *offp); 881 882 return IPPROTO_DONE; 883 884 freeit: 885 m_put_rcvif_psref(rcvif, &psref); 886 m_freem(m); 887 return IPPROTO_DONE; 888 } 889 890 static int 891 icmp6_notify_error(struct mbuf *m, int off, int icmp6len, int code) 892 { 893 struct icmp6_hdr *icmp6; 894 struct ip6_hdr *eip6; 895 u_int32_t notifymtu; 896 struct sockaddr_in6 icmp6src, icmp6dst; 897 898 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) { 899 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 900 goto freeit; 901 } 902 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 903 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 904 if (icmp6 == NULL) { 905 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 906 return (-1); 907 } 908 eip6 = (struct ip6_hdr *)(icmp6 + 1); 909 910 /* Detect the upper level protocol */ 911 { 912 void (*ctlfunc)(int, struct sockaddr *, void *); 913 u_int8_t nxt = eip6->ip6_nxt; 914 int eoff = off + sizeof(struct icmp6_hdr) + 915 sizeof(struct ip6_hdr); 916 struct ip6ctlparam ip6cp; 917 struct in6_addr *finaldst = NULL; 918 int icmp6type = icmp6->icmp6_type; 919 struct ip6_frag *fh; 920 struct ip6_rthdr *rth; 921 struct ip6_rthdr0 *rth0; 922 int rthlen; 923 struct ifnet *rcvif; 924 int s; 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 ICMP6_STATINC(ICMP6_STAT_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 ICMP6_STATINC(ICMP6_STAT_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 ICMP6_STATINC(ICMP6_STAT_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 ICMP6_STATINC(ICMP6_STAT_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 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 1025 return (-1); 1026 } 1027 1028 /* 1029 * retrieve parameters from the inner IPv6 header, and convert 1030 * them into sockaddr structures. 1031 * XXX: there is no guarantee that the source or destination 1032 * addresses of the inner packet are in the same scope zone as 1033 * the addresses of the icmp packet. But there is no other 1034 * way to determine the zone. 1035 */ 1036 eip6 = (struct ip6_hdr *)(icmp6 + 1); 1037 1038 rcvif = m_get_rcvif(m, &s); 1039 sockaddr_in6_init(&icmp6dst, 1040 (finaldst == NULL) ? &eip6->ip6_dst : finaldst, 0, 0, 0); 1041 if (in6_setscope(&icmp6dst.sin6_addr, rcvif, NULL)) { 1042 m_put_rcvif(rcvif, &s); 1043 goto freeit; 1044 } 1045 sockaddr_in6_init(&icmp6src, &eip6->ip6_src, 0, 0, 0); 1046 if (in6_setscope(&icmp6src.sin6_addr, rcvif, NULL)) { 1047 m_put_rcvif(rcvif, &s); 1048 goto freeit; 1049 } 1050 m_put_rcvif(rcvif, &s); 1051 1052 icmp6src.sin6_flowinfo = 1053 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK); 1054 1055 if (finaldst == NULL) 1056 finaldst = &eip6->ip6_dst; 1057 ip6cp.ip6c_m = m; 1058 ip6cp.ip6c_icmp6 = icmp6; 1059 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1); 1060 ip6cp.ip6c_off = eoff; 1061 ip6cp.ip6c_finaldst = finaldst; 1062 ip6cp.ip6c_src = &icmp6src; 1063 ip6cp.ip6c_nxt = nxt; 1064 1065 if (icmp6type == ICMP6_PACKET_TOO_BIG) { 1066 notifymtu = ntohl(icmp6->icmp6_mtu); 1067 ip6cp.ip6c_cmdarg = (void *)¬ifymtu; 1068 } 1069 1070 ctlfunc = (void (*)(int, struct sockaddr *, void *)) 1071 (inet6sw[ip6_protox[nxt]].pr_ctlinput); 1072 if (ctlfunc) { 1073 (void) (*ctlfunc)(code, sin6tosa(&icmp6dst), 1074 &ip6cp); 1075 } 1076 } 1077 return (0); 1078 1079 freeit: 1080 m_freem(m); 1081 return (-1); 1082 } 1083 1084 void 1085 icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated) 1086 { 1087 unsigned long rtcount; 1088 struct icmp6_mtudisc_callback *mc; 1089 struct in6_addr *dst = ip6cp->ip6c_finaldst; 1090 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6; 1091 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */ 1092 u_int mtu = ntohl(icmp6->icmp6_mtu); 1093 struct rtentry *rt = NULL; 1094 struct sockaddr_in6 sin6; 1095 struct ifnet *rcvif; 1096 int s; 1097 1098 /* 1099 * The MTU should not be less than the minimal IPv6 MTU except for the 1100 * hack in ip6_output/ip6_setpmtu where we always include a frag header. 1101 * In that one case, the MTU might be less than 1280. 1102 */ 1103 if (__predict_false(mtu < IPV6_MMTU - sizeof(struct ip6_frag))) { 1104 /* is the mtu even sane? */ 1105 if (mtu < sizeof(struct ip6_hdr) + sizeof(struct ip6_frag) + 8) 1106 return; 1107 if (!validated) 1108 return; 1109 mtu = IPV6_MMTU - sizeof(struct ip6_frag); 1110 } 1111 1112 /* 1113 * allow non-validated cases if memory is plenty, to make traffic 1114 * from non-connected pcb happy. 1115 */ 1116 rtcount = rt_timer_count(icmp6_mtudisc_timeout_q); 1117 if (validated) { 1118 if (0 <= icmp6_mtudisc_hiwat && rtcount > icmp6_mtudisc_hiwat) 1119 return; 1120 else if (0 <= icmp6_mtudisc_lowat && 1121 rtcount > icmp6_mtudisc_lowat) { 1122 /* 1123 * XXX nuke a victim, install the new one. 1124 */ 1125 } 1126 } else { 1127 if (0 <= icmp6_mtudisc_lowat && rtcount > icmp6_mtudisc_lowat) 1128 return; 1129 } 1130 1131 memset(&sin6, 0, sizeof(sin6)); 1132 sin6.sin6_family = PF_INET6; 1133 sin6.sin6_len = sizeof(struct sockaddr_in6); 1134 sin6.sin6_addr = *dst; 1135 s = pserialize_read_enter(); 1136 rcvif = m_get_rcvif(m, &s); 1137 if (in6_setscope(&sin6.sin6_addr, rcvif, NULL)) { 1138 m_put_rcvif(rcvif, &s); 1139 return; 1140 } 1141 m_put_rcvif(rcvif, &s); 1142 1143 rt = icmp6_mtudisc_clone(sin6tosa(&sin6)); 1144 1145 if (rt && (rt->rt_flags & RTF_HOST) && 1146 !(rt->rt_rmx.rmx_locks & RTV_MTU) && 1147 (rt->rt_rmx.rmx_mtu > mtu || rt->rt_rmx.rmx_mtu == 0)) { 1148 if (mtu < IN6_LINKMTU(rt->rt_ifp)) { 1149 ICMP6_STATINC(ICMP6_STAT_PMTUCHG); 1150 rt->rt_rmx.rmx_mtu = mtu; 1151 } 1152 } 1153 if (rt) { 1154 rtfree(rt); 1155 } 1156 1157 /* 1158 * Notify protocols that the MTU for this destination 1159 * has changed. 1160 */ 1161 for (mc = LIST_FIRST(&icmp6_mtudisc_callbacks); mc != NULL; 1162 mc = LIST_NEXT(mc, mc_list)) 1163 (*mc->mc_func)(&sin6.sin6_addr); 1164 } 1165 1166 /* 1167 * Process a Node Information Query packet, based on 1168 * draft-ietf-ipngwg-icmp-name-lookups-07. 1169 * 1170 * Spec incompatibilities: 1171 * - IPv6 Subject address handling 1172 * - IPv4 Subject address handling support missing 1173 * - Proxy reply (answer even if it's not for me) 1174 * - joins NI group address at in6_ifattach() time only, does not cope 1175 * with hostname changes by sethostname(3) 1176 */ 1177 static struct mbuf * 1178 ni6_input(struct mbuf *m, 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; /* ip6_dst */ 1189 struct in6_addr in6_subj; /* subject address */ 1190 struct ip6_hdr *ip6; 1191 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */ 1192 char *subj = NULL; 1193 struct ifnet *rcvif; 1194 int s, ss; 1195 struct ifaddr *ifa; 1196 struct psref psref; 1197 1198 ip6 = mtod(m, struct ip6_hdr *); 1199 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6)); 1200 if (ni6 == NULL) { 1201 /* m is already reclaimed */ 1202 return NULL; 1203 } 1204 1205 /* 1206 * Validate IPv6 destination address. 1207 * 1208 * The Responder must discard the Query without further processing 1209 * unless it is one of the Responder's unicast or anycast addresses, or 1210 * a link-local scope multicast address which the Responder has joined. 1211 * [icmp-name-lookups-07, Section 4.] 1212 */ 1213 sockaddr_in6_init(&sin6, &ip6->ip6_dst, 0, 0, 0); 1214 /* XXX scopeid */ 1215 ss = pserialize_read_enter(); 1216 ifa = ifa_ifwithaddr(sin6tosa(&sin6)); 1217 if (ifa != NULL) 1218 ; /* unicast/anycast, fine */ 1219 else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr)) 1220 ; /* link-local multicast, fine */ 1221 else { 1222 pserialize_read_exit(ss); 1223 goto bad; 1224 } 1225 pserialize_read_exit(ss); 1226 1227 /* validate query Subject field. */ 1228 qtype = ntohs(ni6->ni_qtype); 1229 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo); 1230 switch (qtype) { 1231 case NI_QTYPE_NOOP: 1232 case NI_QTYPE_SUPTYPES: 1233 /* 07 draft */ 1234 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0) 1235 break; 1236 /* FALLTHROUGH */ 1237 case NI_QTYPE_FQDN: 1238 case NI_QTYPE_NODEADDR: 1239 case NI_QTYPE_IPV4ADDR: 1240 switch (ni6->ni_code) { 1241 case ICMP6_NI_SUBJ_IPV6: 1242 #if ICMP6_NI_SUBJ_IPV6 != 0 1243 case 0: 1244 #endif 1245 /* 1246 * backward compatibility - try to accept 03 draft 1247 * format, where no Subject is present. 1248 */ 1249 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 && 1250 subjlen == 0) { 1251 oldfqdn++; 1252 break; 1253 } 1254 #if ICMP6_NI_SUBJ_IPV6 != 0 1255 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6) 1256 goto bad; 1257 #endif 1258 1259 if (subjlen != sizeof(sin6.sin6_addr)) 1260 goto bad; 1261 1262 /* 1263 * Validate Subject address. 1264 * 1265 * Not sure what exactly "address belongs to the node" 1266 * means in the spec, is it just unicast, or what? 1267 * 1268 * At this moment we consider Subject address as 1269 * "belong to the node" if the Subject address equals 1270 * to the IPv6 destination address; validation for 1271 * IPv6 destination address should have done enough 1272 * check for us. 1273 * 1274 * We do not do proxy at this moment. 1275 */ 1276 /* m_pulldown instead of copy? */ 1277 m_copydata(m, off + sizeof(struct icmp6_nodeinfo), 1278 subjlen, (void *)&in6_subj); 1279 rcvif = m_get_rcvif(m, &s); 1280 if (in6_setscope(&in6_subj, rcvif, NULL)) { 1281 m_put_rcvif(rcvif, &s); 1282 goto bad; 1283 } 1284 m_put_rcvif(rcvif, &s); 1285 1286 subj = (char *)&in6_subj; 1287 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &in6_subj)) 1288 break; 1289 1290 /* 1291 * XXX if we are to allow other cases, we should really 1292 * be careful about scope here. 1293 * basically, we should disallow queries toward IPv6 1294 * destination X with subject Y, if scope(X) > scope(Y). 1295 * if we allow scope(X) > scope(Y), it will result in 1296 * information leakage across scope boundary. 1297 */ 1298 goto bad; 1299 1300 case ICMP6_NI_SUBJ_FQDN: 1301 /* 1302 * Validate Subject name with gethostname(3). 1303 * 1304 * The behavior may need some debate, since: 1305 * - we are not sure if the node has FQDN as 1306 * hostname (returned by gethostname(3)). 1307 * - the code does wildcard match for truncated names. 1308 * however, we are not sure if we want to perform 1309 * wildcard match, if gethostname(3) side has 1310 * truncated hostname. 1311 */ 1312 n = ni6_nametodns(hostname, hostnamelen, 0); 1313 if (!n || n->m_next || n->m_len == 0) 1314 goto bad; 1315 IP6_EXTHDR_GET(subj, char *, m, 1316 off + sizeof(struct icmp6_nodeinfo), subjlen); 1317 if (subj == NULL) 1318 goto bad; 1319 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *), 1320 n->m_len)) { 1321 goto bad; 1322 } 1323 m_freem(n); 1324 n = NULL; 1325 break; 1326 1327 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */ 1328 default: 1329 goto bad; 1330 } 1331 break; 1332 } 1333 1334 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */ 1335 switch (qtype) { 1336 case NI_QTYPE_FQDN: 1337 if ((icmp6_nodeinfo & 1) == 0) 1338 goto bad; 1339 break; 1340 case NI_QTYPE_NODEADDR: 1341 case NI_QTYPE_IPV4ADDR: 1342 if ((icmp6_nodeinfo & 2) == 0) 1343 goto bad; 1344 break; 1345 } 1346 1347 /* guess reply length */ 1348 switch (qtype) { 1349 case NI_QTYPE_NOOP: 1350 break; /* no reply data */ 1351 case NI_QTYPE_SUPTYPES: 1352 replylen += sizeof(u_int32_t); 1353 break; 1354 case NI_QTYPE_FQDN: 1355 /* XXX will append an mbuf */ 1356 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1357 break; 1358 case NI_QTYPE_NODEADDR: 1359 addrs = ni6_addrs(ni6, m, &ifp, subj, &psref); 1360 if ((replylen += addrs * (sizeof(struct in6_addr) + 1361 sizeof(u_int32_t))) > MCLBYTES) 1362 replylen = MCLBYTES; /* XXX: will truncate pkt later */ 1363 break; 1364 case NI_QTYPE_IPV4ADDR: 1365 /* unsupported - should respond with unknown Qtype? */ 1366 goto bad; 1367 default: 1368 /* 1369 * XXX: We must return a reply with the ICMP6 code 1370 * `unknown Qtype' in this case. However we regard the case 1371 * as an FQDN query for backward compatibility. 1372 * Older versions set a random value to this field, 1373 * so it rarely varies in the defined qtypes. 1374 * But the mechanism is not reliable... 1375 * maybe we should obsolete older versions. 1376 */ 1377 qtype = NI_QTYPE_FQDN; 1378 /* XXX will append an mbuf */ 1379 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1380 oldfqdn++; 1381 break; 1382 } 1383 1384 /* allocate an mbuf to reply. */ 1385 MGETHDR(n, M_DONTWAIT, m->m_type); 1386 if (n == NULL) { 1387 if_put(ifp, &psref); 1388 m_freem(m); 1389 return (NULL); 1390 } 1391 M_MOVE_PKTHDR(n, m); /* just for rcvif */ 1392 if (replylen > MHLEN) { 1393 if (replylen > MCLBYTES) { 1394 /* 1395 * XXX: should we try to allocate more? But MCLBYTES 1396 * is probably much larger than IPV6_MMTU... 1397 */ 1398 goto bad; 1399 } 1400 MCLGET(n, M_DONTWAIT); 1401 if ((n->m_flags & M_EXT) == 0) { 1402 goto bad; 1403 } 1404 } 1405 n->m_pkthdr.len = n->m_len = replylen; 1406 1407 /* copy mbuf header and IPv6 + Node Information base headers */ 1408 bcopy(mtod(m, void *), mtod(n, void *), sizeof(struct ip6_hdr)); 1409 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1); 1410 bcopy((void *)ni6, (void *)nni6, sizeof(struct icmp6_nodeinfo)); 1411 1412 /* qtype dependent procedure */ 1413 switch (qtype) { 1414 case NI_QTYPE_NOOP: 1415 nni6->ni_code = ICMP6_NI_SUCCESS; 1416 nni6->ni_flags = 0; 1417 break; 1418 case NI_QTYPE_SUPTYPES: 1419 { 1420 u_int32_t v; 1421 nni6->ni_code = ICMP6_NI_SUCCESS; 1422 nni6->ni_flags = htons(0x0000); /* raw bitmap */ 1423 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */ 1424 v = (u_int32_t)htonl(0x0000000f); 1425 bcopy(&v, nni6 + 1, sizeof(u_int32_t)); 1426 break; 1427 } 1428 case NI_QTYPE_FQDN: 1429 nni6->ni_code = ICMP6_NI_SUCCESS; 1430 fqdn = (struct ni_reply_fqdn *)(mtod(n, char *) + 1431 sizeof(struct ip6_hdr) + 1432 sizeof(struct icmp6_nodeinfo)); 1433 nni6->ni_flags = 0; /* XXX: meaningless TTL */ 1434 fqdn->ni_fqdn_ttl = 0; /* ditto. */ 1435 /* 1436 * XXX do we really have FQDN in variable "hostname"? 1437 */ 1438 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn); 1439 if (n->m_next == NULL) 1440 goto bad; 1441 /* XXX we assume that n->m_next is not a chain */ 1442 if (n->m_next->m_next != NULL) 1443 goto bad; 1444 n->m_pkthdr.len += n->m_next->m_len; 1445 break; 1446 case NI_QTYPE_NODEADDR: 1447 { 1448 int lenlim, copied; 1449 1450 nni6->ni_code = ICMP6_NI_SUCCESS; 1451 n->m_pkthdr.len = n->m_len = 1452 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1453 lenlim = M_TRAILINGSPACE(n); 1454 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim); 1455 if_put(ifp, &psref); 1456 ifp = NULL; 1457 /* XXX: reset mbuf length */ 1458 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 1459 sizeof(struct icmp6_nodeinfo) + copied; 1460 break; 1461 } 1462 default: 1463 break; /* XXX impossible! */ 1464 } 1465 1466 nni6->ni_type = ICMP6_NI_REPLY; 1467 m_freem(m); 1468 return (n); 1469 1470 bad: 1471 if_put(ifp, &psref); 1472 m_freem(m); 1473 if (n) 1474 m_freem(n); 1475 return (NULL); 1476 } 1477 #undef hostnamelen 1478 1479 #define isupper(x) ('A' <= (x) && (x) <= 'Z') 1480 #define isalpha(x) (('A' <= (x) && (x) <= 'Z') || ('a' <= (x) && (x) <= 'z')) 1481 #define isalnum(x) (isalpha(x) || ('0' <= (x) && (x) <= '9')) 1482 #define tolower(x) (isupper(x) ? (x) + 'a' - 'A' : (x)) 1483 1484 /* 1485 * make a mbuf with DNS-encoded string. no compression support. 1486 * 1487 * XXX names with less than 2 dots (like "foo" or "foo.section") will be 1488 * treated as truncated name (two \0 at the end). this is a wild guess. 1489 * 1490 * old - return pascal string if non-zero 1491 */ 1492 static struct mbuf * 1493 ni6_nametodns(const char *name, int namelen, int old) 1494 { 1495 struct mbuf *m; 1496 char *cp, *ep; 1497 const char *p, *q; 1498 int i, len, nterm; 1499 1500 if (old) 1501 len = namelen + 1; 1502 else 1503 len = MCLBYTES; 1504 1505 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */ 1506 MGET(m, M_DONTWAIT, MT_DATA); 1507 if (m && len > MLEN) { 1508 MCLGET(m, M_DONTWAIT); 1509 if ((m->m_flags & M_EXT) == 0) 1510 goto fail; 1511 } 1512 if (!m) 1513 goto fail; 1514 m->m_next = NULL; 1515 1516 if (old) { 1517 m->m_len = len; 1518 *mtod(m, char *) = namelen; 1519 bcopy(name, mtod(m, char *) + 1, namelen); 1520 return m; 1521 } else { 1522 m->m_len = 0; 1523 cp = mtod(m, char *); 1524 ep = mtod(m, char *) + M_TRAILINGSPACE(m); 1525 1526 /* if not certain about my name, return empty buffer */ 1527 if (namelen == 0) 1528 return m; 1529 1530 /* 1531 * guess if it looks like shortened hostname, or FQDN. 1532 * shortened hostname needs two trailing "\0". 1533 */ 1534 i = 0; 1535 for (p = name; p < name + namelen; p++) { 1536 if (*p && *p == '.') 1537 i++; 1538 } 1539 if (i < 2) 1540 nterm = 2; 1541 else 1542 nterm = 1; 1543 1544 p = name; 1545 while (cp < ep && p < name + namelen) { 1546 i = 0; 1547 for (q = p; q < name + namelen && *q && *q != '.'; q++) 1548 i++; 1549 /* result does not fit into mbuf */ 1550 if (cp + i + 1 >= ep) 1551 goto fail; 1552 /* 1553 * DNS label length restriction, RFC1035 page 8. 1554 * "i == 0" case is included here to avoid returning 1555 * 0-length label on "foo..bar". 1556 */ 1557 if (i <= 0 || i >= 64) 1558 goto fail; 1559 *cp++ = i; 1560 if (!isalpha(p[0]) || !isalnum(p[i - 1])) 1561 goto fail; 1562 while (i > 0) { 1563 if (!isalnum(*p) && *p != '-') 1564 goto fail; 1565 if (isupper(*p)) { 1566 *cp++ = tolower(*p); 1567 p++; 1568 } else 1569 *cp++ = *p++; 1570 i--; 1571 } 1572 p = q; 1573 if (p < name + namelen && *p == '.') 1574 p++; 1575 } 1576 /* termination */ 1577 if (cp + nterm >= ep) 1578 goto fail; 1579 while (nterm-- > 0) 1580 *cp++ = '\0'; 1581 m->m_len = cp - mtod(m, char *); 1582 return m; 1583 } 1584 1585 panic("should not reach here"); 1586 /* NOTREACHED */ 1587 1588 fail: 1589 if (m) 1590 m_freem(m); 1591 return NULL; 1592 } 1593 1594 /* 1595 * check if two DNS-encoded string matches. takes care of truncated 1596 * form (with \0\0 at the end). no compression support. 1597 * XXX upper/lowercase match (see RFC2065) 1598 */ 1599 static int 1600 ni6_dnsmatch(const char *a, int alen, const char *b, int blen) 1601 { 1602 const char *a0, *b0; 1603 int l; 1604 1605 /* simplest case - need validation? */ 1606 if (alen == blen && memcmp(a, b, alen) == 0) 1607 return 1; 1608 1609 a0 = a; 1610 b0 = b; 1611 1612 /* termination is mandatory */ 1613 if (alen < 2 || blen < 2) 1614 return 0; 1615 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0') 1616 return 0; 1617 alen--; 1618 blen--; 1619 1620 while (a - a0 < alen && b - b0 < blen) { 1621 if (a - a0 + 1 > alen || b - b0 + 1 > blen) 1622 return 0; 1623 1624 if ((signed char)a[0] < 0 || (signed char)b[0] < 0) 1625 return 0; 1626 /* we don't support compression yet */ 1627 if (a[0] >= 64 || b[0] >= 64) 1628 return 0; 1629 1630 /* truncated case */ 1631 if (a[0] == 0 && a - a0 == alen - 1) 1632 return 1; 1633 if (b[0] == 0 && b - b0 == blen - 1) 1634 return 1; 1635 if (a[0] == 0 || b[0] == 0) 1636 return 0; 1637 1638 if (a[0] != b[0]) 1639 return 0; 1640 l = a[0]; 1641 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen) 1642 return 0; 1643 if (memcmp(a + 1, b + 1, l) != 0) 1644 return 0; 1645 1646 a += 1 + l; 1647 b += 1 + l; 1648 } 1649 1650 if (a - a0 == alen && b - b0 == blen) 1651 return 1; 1652 else 1653 return 0; 1654 } 1655 1656 /* 1657 * calculate the number of addresses to be returned in the node info reply. 1658 */ 1659 static int 1660 ni6_addrs(struct icmp6_nodeinfo *ni6, struct mbuf *m, 1661 struct ifnet **ifpp, char *subj, struct psref *psref) 1662 { 1663 struct ifnet *ifp; 1664 struct in6_ifaddr *ia6; 1665 struct ifaddr *ifa; 1666 struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */ 1667 int addrs = 0, addrsofif, iffound = 0; 1668 int niflags = ni6->ni_flags; 1669 int s; 1670 1671 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) { 1672 switch (ni6->ni_code) { 1673 case ICMP6_NI_SUBJ_IPV6: 1674 if (subj == NULL) /* must be impossible... */ 1675 return (0); 1676 subj_ip6 = (struct sockaddr_in6 *)subj; 1677 break; 1678 default: 1679 /* 1680 * XXX: we only support IPv6 subject address for 1681 * this Qtype. 1682 */ 1683 return (0); 1684 } 1685 } 1686 1687 s = pserialize_read_enter(); 1688 IFNET_READER_FOREACH(ifp) { 1689 addrsofif = 0; 1690 IFADDR_READER_FOREACH(ifa, ifp) { 1691 if (ifa->ifa_addr->sa_family != AF_INET6) 1692 continue; 1693 ia6 = (struct in6_ifaddr *)ifa; 1694 1695 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 && 1696 IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr, 1697 &ia6->ia_addr.sin6_addr)) 1698 iffound = 1; 1699 1700 /* 1701 * IPv4-mapped addresses can only be returned by a 1702 * Node Information proxy, since they represent 1703 * addresses of IPv4-only nodes, which perforce do 1704 * not implement this protocol. 1705 * [icmp-name-lookups-07, Section 5.4] 1706 * So we don't support NI_NODEADDR_FLAG_COMPAT in 1707 * this function at this moment. 1708 */ 1709 1710 /* What do we have to do about ::1? */ 1711 switch (in6_addrscope(&ia6->ia_addr.sin6_addr)) { 1712 case IPV6_ADDR_SCOPE_LINKLOCAL: 1713 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1714 continue; 1715 break; 1716 case IPV6_ADDR_SCOPE_SITELOCAL: 1717 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1718 continue; 1719 break; 1720 case IPV6_ADDR_SCOPE_GLOBAL: 1721 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1722 continue; 1723 break; 1724 default: 1725 continue; 1726 } 1727 1728 /* 1729 * check if anycast is okay. 1730 * XXX: just experimental. not in the spec. 1731 */ 1732 if ((ia6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1733 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 1734 continue; /* we need only unicast addresses */ 1735 1736 addrsofif++; /* count the address */ 1737 } 1738 if (iffound) { 1739 if_acquire_NOMPSAFE(ifp, psref); 1740 pserialize_read_exit(s); 1741 *ifpp = ifp; 1742 return (addrsofif); 1743 } 1744 1745 addrs += addrsofif; 1746 } 1747 pserialize_read_exit(s); 1748 1749 return (addrs); 1750 } 1751 1752 static int 1753 ni6_store_addrs(struct icmp6_nodeinfo *ni6, 1754 struct icmp6_nodeinfo *nni6, struct ifnet *ifp0, 1755 int resid) 1756 { 1757 struct ifnet *ifp; 1758 struct in6_ifaddr *ia6; 1759 struct ifaddr *ifa; 1760 struct ifnet *ifp_dep = NULL; 1761 int copied = 0, allow_deprecated = 0; 1762 u_char *cp = (u_char *)(nni6 + 1); 1763 int niflags = ni6->ni_flags; 1764 u_int32_t ltime; 1765 int s; 1766 1767 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL)) 1768 return (0); /* needless to copy */ 1769 1770 s = pserialize_read_enter(); 1771 ifp = ifp0 ? ifp0 : IFNET_READER_FIRST(); 1772 again: 1773 1774 for (; ifp; ifp = IFNET_READER_NEXT(ifp)) 1775 { 1776 IFADDR_READER_FOREACH(ifa, ifp) { 1777 if (ifa->ifa_addr->sa_family != AF_INET6) 1778 continue; 1779 ia6 = (struct in6_ifaddr *)ifa; 1780 1781 if ((ia6->ia6_flags & IN6_IFF_DEPRECATED) != 0 && 1782 allow_deprecated == 0) { 1783 /* 1784 * prefererred address should be put before 1785 * deprecated addresses. 1786 */ 1787 1788 /* record the interface for later search */ 1789 if (ifp_dep == NULL) 1790 ifp_dep = ifp; 1791 1792 continue; 1793 } 1794 else if ((ia6->ia6_flags & IN6_IFF_DEPRECATED) == 0 && 1795 allow_deprecated != 0) 1796 continue; /* we now collect deprecated addrs */ 1797 1798 /* What do we have to do about ::1? */ 1799 switch (in6_addrscope(&ia6->ia_addr.sin6_addr)) { 1800 case IPV6_ADDR_SCOPE_LINKLOCAL: 1801 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1802 continue; 1803 break; 1804 case IPV6_ADDR_SCOPE_SITELOCAL: 1805 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1806 continue; 1807 break; 1808 case IPV6_ADDR_SCOPE_GLOBAL: 1809 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1810 continue; 1811 break; 1812 default: 1813 continue; 1814 } 1815 1816 /* 1817 * check if anycast is okay. 1818 * XXX: just experimental. not in the spec. 1819 */ 1820 if ((ia6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1821 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 1822 continue; 1823 1824 /* now we can copy the address */ 1825 if (resid < sizeof(struct in6_addr) + 1826 sizeof(u_int32_t)) { 1827 /* 1828 * We give up much more copy. 1829 * Set the truncate flag and return. 1830 */ 1831 nni6->ni_flags |= NI_NODEADDR_FLAG_TRUNCATE; 1832 goto out; 1833 } 1834 1835 /* 1836 * Set the TTL of the address. 1837 * The TTL value should be one of the following 1838 * according to the specification: 1839 * 1840 * 1. The remaining lifetime of a DHCP lease on the 1841 * address, or 1842 * 2. The remaining Valid Lifetime of a prefix from 1843 * which the address was derived through Stateless 1844 * Autoconfiguration. 1845 * 1846 * Note that we currently do not support stateful 1847 * address configuration by DHCPv6, so the former 1848 * case can't happen. 1849 * 1850 * TTL must be 2^31 > TTL >= 0. 1851 */ 1852 if (ia6->ia6_lifetime.ia6t_expire == 0) 1853 ltime = ND6_INFINITE_LIFETIME; 1854 else { 1855 if (ia6->ia6_lifetime.ia6t_expire > 1856 time_uptime) 1857 ltime = ia6->ia6_lifetime.ia6t_expire - 1858 time_uptime; 1859 else 1860 ltime = 0; 1861 } 1862 if (ltime > 0x7fffffff) 1863 ltime = 0x7fffffff; 1864 ltime = htonl(ltime); 1865 1866 bcopy(<ime, cp, sizeof(u_int32_t)); 1867 cp += sizeof(u_int32_t); 1868 1869 /* copy the address itself */ 1870 bcopy(&ia6->ia_addr.sin6_addr, cp, 1871 sizeof(struct in6_addr)); 1872 in6_clearscope((struct in6_addr *)cp); /* XXX */ 1873 cp += sizeof(struct in6_addr); 1874 1875 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1876 copied += (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1877 } 1878 if (ifp0) /* we need search only on the specified IF */ 1879 break; 1880 } 1881 1882 if (allow_deprecated == 0 && ifp_dep != NULL) { 1883 ifp = ifp_dep; 1884 allow_deprecated = 1; 1885 1886 goto again; 1887 } 1888 out: 1889 pserialize_read_exit(s); 1890 return (copied); 1891 } 1892 1893 /* 1894 * XXX almost dup'ed code with rip6_input. 1895 */ 1896 static int 1897 icmp6_rip6_input(struct mbuf **mp, int off) 1898 { 1899 struct mbuf *m = *mp; 1900 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1901 struct inpcb_hdr *inph; 1902 struct in6pcb *in6p; 1903 struct in6pcb *last = NULL; 1904 struct sockaddr_in6 rip6src; 1905 struct icmp6_hdr *icmp6; 1906 struct mbuf *opts = NULL; 1907 1908 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 1909 if (icmp6 == NULL) { 1910 /* m is already reclaimed */ 1911 return IPPROTO_DONE; 1912 } 1913 1914 /* 1915 * XXX: the address may have embedded scope zone ID, which should be 1916 * hidden from applications. 1917 */ 1918 sockaddr_in6_init(&rip6src, &ip6->ip6_src, 0, 0, 0); 1919 if (sa6_recoverscope(&rip6src)) { 1920 m_freem(m); 1921 return (IPPROTO_DONE); 1922 } 1923 1924 TAILQ_FOREACH(inph, &raw6cbtable.inpt_queue, inph_queue) { 1925 in6p = (struct in6pcb *)inph; 1926 if (in6p->in6p_af != AF_INET6) 1927 continue; 1928 if (in6p->in6p_ip6.ip6_nxt != IPPROTO_ICMPV6) 1929 continue; 1930 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && 1931 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst)) 1932 continue; 1933 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) && 1934 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src)) 1935 continue; 1936 if (in6p->in6p_icmp6filt 1937 && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type, 1938 in6p->in6p_icmp6filt)) 1939 continue; 1940 if (last) { 1941 struct mbuf *n; 1942 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { 1943 if (last->in6p_flags & IN6P_CONTROLOPTS) 1944 ip6_savecontrol(last, &opts, ip6, n); 1945 /* strip intermediate headers */ 1946 m_adj(n, off); 1947 if (sbappendaddr(&last->in6p_socket->so_rcv, 1948 sin6tosa(&rip6src), n, opts) == 0) { 1949 /* should notify about lost packet */ 1950 m_freem(n); 1951 if (opts) 1952 m_freem(opts); 1953 } else 1954 sorwakeup(last->in6p_socket); 1955 opts = NULL; 1956 } 1957 } 1958 last = in6p; 1959 } 1960 if (last) { 1961 if (last->in6p_flags & IN6P_CONTROLOPTS) 1962 ip6_savecontrol(last, &opts, ip6, m); 1963 /* strip intermediate headers */ 1964 m_adj(m, off); 1965 if (sbappendaddr(&last->in6p_socket->so_rcv, 1966 sin6tosa(&rip6src), m, opts) == 0) { 1967 m_freem(m); 1968 if (opts) 1969 m_freem(opts); 1970 } else 1971 sorwakeup(last->in6p_socket); 1972 } else { 1973 m_freem(m); 1974 IP6_STATDEC(IP6_STAT_DELIVERED); 1975 } 1976 return IPPROTO_DONE; 1977 } 1978 1979 /* 1980 * Reflect the ip6 packet back to the source. 1981 * OFF points to the icmp6 header, counted from the top of the mbuf. 1982 * 1983 * Note: RFC 1885 required that an echo reply should be truncated if it 1984 * did not fit in with (return) path MTU, and KAME code supported the 1985 * behavior. However, as a clarification after the RFC, this limitation 1986 * was removed in a revised version of the spec, RFC 2463. We had kept the 1987 * old behavior, with a (non-default) ifdef block, while the new version of 1988 * the spec was an internet-draft status, and even after the new RFC was 1989 * published. But it would rather make sense to clean the obsoleted part 1990 * up, and to make the code simpler at this stage. 1991 */ 1992 void 1993 icmp6_reflect(struct mbuf *m, size_t off) 1994 { 1995 struct ip6_hdr *ip6; 1996 struct icmp6_hdr *icmp6; 1997 const struct in6_ifaddr *ia; 1998 const struct ip6aux *ip6a; 1999 int plen; 2000 int type, code; 2001 struct ifnet *outif = NULL; 2002 struct in6_addr origdst; 2003 const struct in6_addr *src = NULL; 2004 struct ifnet *rcvif; 2005 int s; 2006 2007 /* too short to reflect */ 2008 if (off < sizeof(struct ip6_hdr)) { 2009 nd6log(LOG_DEBUG, 2010 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n", 2011 (u_long)off, (u_long)sizeof(struct ip6_hdr), 2012 __FILE__, __LINE__); 2013 goto bad; 2014 } 2015 2016 /* 2017 * If there are extra headers between IPv6 and ICMPv6, strip 2018 * off that header first. 2019 */ 2020 #ifdef DIAGNOSTIC 2021 if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN) 2022 panic("assumption failed in icmp6_reflect"); 2023 #endif 2024 if (off > sizeof(struct ip6_hdr)) { 2025 size_t l; 2026 struct ip6_hdr nip6; 2027 2028 l = off - sizeof(struct ip6_hdr); 2029 m_copydata(m, 0, sizeof(nip6), (void *)&nip6); 2030 m_adj(m, l); 2031 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2032 if (m->m_len < l) { 2033 if ((m = m_pullup(m, l)) == NULL) 2034 return; 2035 } 2036 bcopy((void *)&nip6, mtod(m, void *), sizeof(nip6)); 2037 } else /* off == sizeof(struct ip6_hdr) */ { 2038 size_t l; 2039 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2040 if (m->m_len < l) { 2041 if ((m = m_pullup(m, l)) == NULL) 2042 return; 2043 } 2044 } 2045 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr); 2046 ip6 = mtod(m, struct ip6_hdr *); 2047 ip6->ip6_nxt = IPPROTO_ICMPV6; 2048 icmp6 = (struct icmp6_hdr *)(ip6 + 1); 2049 type = icmp6->icmp6_type; /* keep type for statistics */ 2050 code = icmp6->icmp6_code; /* ditto. */ 2051 2052 origdst = ip6->ip6_dst; 2053 /* 2054 * ip6_input() drops a packet if its src is multicast. 2055 * So, the src is never multicast. 2056 */ 2057 ip6->ip6_dst = ip6->ip6_src; 2058 2059 /* 2060 * If the incoming packet was addressed directly to us (i.e. unicast), 2061 * use dst as the src for the reply. 2062 * The IN6_IFF_NOTREADY case should be VERY rare, but is possible 2063 * (for example) when we encounter an error while forwarding procedure 2064 * destined to a duplicated address of ours. 2065 * Note that ip6_getdstifaddr() may fail if we are in an error handling 2066 * procedure of an outgoing packet of our own, in which case we need 2067 * to search in the ifaddr list. 2068 */ 2069 if (IN6_IS_ADDR_MULTICAST(&origdst)) 2070 ; 2071 else if ((ip6a = ip6_getdstifaddr(m)) != NULL) { 2072 if ((ip6a->ip6a_flags & 2073 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) 2074 src = &ip6a->ip6a_src; 2075 } else { 2076 union { 2077 struct sockaddr_in6 sin6; 2078 struct sockaddr sa; 2079 } u; 2080 int _s; 2081 struct ifaddr *ifa; 2082 2083 sockaddr_in6_init(&u.sin6, &origdst, 0, 0, 0); 2084 2085 _s = pserialize_read_enter(); 2086 ifa = ifa_ifwithaddr(&u.sa); 2087 2088 if (ifa != NULL) { 2089 ia = ifatoia6(ifa); 2090 if ((ia->ia6_flags & 2091 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) 2092 src = &ia->ia_addr.sin6_addr; 2093 } 2094 pserialize_read_exit(_s); 2095 } 2096 2097 if (src == NULL) { 2098 int e; 2099 struct sockaddr_in6 sin6; 2100 struct route ro; 2101 2102 /* 2103 * This case matches to multicasts, our anycast, or unicasts 2104 * that we do not own. Select a source address based on the 2105 * source address of the erroneous packet. 2106 */ 2107 /* zone ID should be embedded */ 2108 sockaddr_in6_init(&sin6, &ip6->ip6_dst, 0, 0, 0); 2109 2110 memset(&ro, 0, sizeof(ro)); 2111 src = in6_selectsrc(&sin6, NULL, NULL, &ro, NULL, NULL, NULL, &e); 2112 rtcache_free(&ro); 2113 if (src == NULL) { 2114 nd6log(LOG_DEBUG, 2115 "source can't be determined: " 2116 "dst=%s, error=%d\n", 2117 ip6_sprintf(&sin6.sin6_addr), e); 2118 goto bad; 2119 } 2120 } 2121 2122 ip6->ip6_src = *src; 2123 ip6->ip6_flow = 0; 2124 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2125 ip6->ip6_vfc |= IPV6_VERSION; 2126 ip6->ip6_nxt = IPPROTO_ICMPV6; 2127 rcvif = m_get_rcvif(m, &s); 2128 if (rcvif) { 2129 /* XXX: This may not be the outgoing interface */ 2130 ip6->ip6_hlim = ND_IFINFO(rcvif)->chlim; 2131 } else 2132 ip6->ip6_hlim = ip6_defhlim; 2133 m_put_rcvif(rcvif, &s); 2134 2135 m->m_pkthdr.csum_flags = 0; 2136 icmp6->icmp6_cksum = 0; 2137 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6, 2138 sizeof(struct ip6_hdr), plen); 2139 2140 /* 2141 * XXX option handling 2142 */ 2143 2144 m->m_flags &= ~(M_BCAST|M_MCAST); 2145 2146 /* 2147 * To avoid a "too big" situation at an intermediate router 2148 * and the path MTU discovery process, specify the IPV6_MINMTU flag. 2149 * Note that only echo and node information replies are affected, 2150 * since the length of ICMP6 errors is limited to the minimum MTU. 2151 */ 2152 if (ip6_output(m, NULL, NULL, IPV6_MINMTU, NULL, NULL, &outif) 2153 != 0 && outif) 2154 icmp6_ifstat_inc(outif, ifs6_out_error); 2155 if (outif) 2156 icmp6_ifoutstat_inc(outif, type, code); 2157 2158 return; 2159 2160 bad: 2161 m_freem(m); 2162 return; 2163 } 2164 2165 static const char * 2166 icmp6_redirect_diag(struct in6_addr *src6, struct in6_addr *dst6, 2167 struct in6_addr *tgt6) 2168 { 2169 static char buf[1024]; 2170 snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)", 2171 ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6)); 2172 return buf; 2173 } 2174 2175 void 2176 icmp6_redirect_input(struct mbuf *m, int off) 2177 { 2178 struct ifnet *ifp; 2179 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 2180 struct nd_redirect *nd_rd; 2181 int icmp6len = ntohs(ip6->ip6_plen); 2182 char *lladdr = NULL; 2183 int lladdrlen = 0; 2184 struct rtentry *rt = NULL; 2185 int is_router; 2186 int is_onlink; 2187 struct in6_addr src6 = ip6->ip6_src; 2188 struct in6_addr redtgt6; 2189 struct in6_addr reddst6; 2190 union nd_opts ndopts; 2191 struct psref psref; 2192 2193 ifp = m_get_rcvif_psref(m, &psref); 2194 if (ifp == NULL) 2195 goto freeit; 2196 2197 /* XXX if we are router, we don't update route by icmp6 redirect */ 2198 if (ip6_forwarding) 2199 goto freeit; 2200 if (!icmp6_rediraccept) 2201 goto freeit; 2202 2203 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len); 2204 if (nd_rd == NULL) { 2205 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 2206 m_put_rcvif_psref(ifp, &psref); 2207 return; 2208 } 2209 redtgt6 = nd_rd->nd_rd_target; 2210 reddst6 = nd_rd->nd_rd_dst; 2211 2212 if (in6_setscope(&redtgt6, ifp, NULL) || 2213 in6_setscope(&reddst6, ifp, NULL)) { 2214 goto freeit; 2215 } 2216 2217 /* validation */ 2218 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) { 2219 nd6log(LOG_ERR, 2220 "ICMP6 redirect sent from %s rejected; " 2221 "must be from linklocal\n", ip6_sprintf(&src6)); 2222 goto bad; 2223 } 2224 if (ip6->ip6_hlim != 255) { 2225 nd6log(LOG_ERR, 2226 "ICMP6 redirect sent from %s rejected; " 2227 "hlim=%d (must be 255)\n", 2228 ip6_sprintf(&src6), ip6->ip6_hlim); 2229 goto bad; 2230 } 2231 { 2232 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */ 2233 struct sockaddr_in6 sin6; 2234 struct in6_addr *gw6; 2235 2236 sockaddr_in6_init(&sin6, &reddst6, 0, 0, 0); 2237 rt = rtalloc1(sin6tosa(&sin6), 0); 2238 if (rt) { 2239 if (rt->rt_gateway == NULL || 2240 rt->rt_gateway->sa_family != AF_INET6) { 2241 nd6log(LOG_ERR, 2242 "ICMP6 redirect rejected; no route " 2243 "with inet6 gateway found for redirect dst: %s\n", 2244 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); 2245 rtfree(rt); 2246 goto bad; 2247 } 2248 2249 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr); 2250 if (memcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) { 2251 nd6log(LOG_ERR, 2252 "ICMP6 redirect rejected; " 2253 "not equal to gw-for-src=%s (must be same): %s\n", 2254 ip6_sprintf(gw6), 2255 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); 2256 rtfree(rt); 2257 goto bad; 2258 } 2259 } else { 2260 nd6log(LOG_ERR, "ICMP6 redirect rejected; " 2261 "no route found for redirect dst: %s\n", 2262 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); 2263 goto bad; 2264 } 2265 rtfree(rt); 2266 rt = NULL; 2267 } 2268 if (IN6_IS_ADDR_MULTICAST(&reddst6)) { 2269 nd6log(LOG_ERR, "ICMP6 redirect rejected; " 2270 "redirect dst must be unicast: %s\n", 2271 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); 2272 goto bad; 2273 } 2274 2275 is_router = is_onlink = 0; 2276 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 2277 is_router = 1; /* router case */ 2278 if (memcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0) 2279 is_onlink = 1; /* on-link destination case */ 2280 if (!is_router && !is_onlink) { 2281 nd6log(LOG_ERR, "ICMP6 redirect rejected; " 2282 "neither router case nor onlink case: %s\n", 2283 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); 2284 goto bad; 2285 } 2286 /* validation passed */ 2287 2288 icmp6len -= sizeof(*nd_rd); 2289 nd6_option_init(nd_rd + 1, icmp6len, &ndopts); 2290 if (nd6_options(&ndopts) < 0) { 2291 nd6log(LOG_INFO, "invalid ND option, rejected: %s\n", 2292 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); 2293 /* nd6_options have incremented stats */ 2294 goto freeit; 2295 } 2296 2297 if (ndopts.nd_opts_tgt_lladdr) { 2298 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 2299 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 2300 } 2301 2302 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 2303 nd6log(LOG_INFO, "lladdrlen mismatch for %s " 2304 "(if %d, icmp6 packet %d): %s\n", 2305 ip6_sprintf(&redtgt6), ifp->if_addrlen, lladdrlen - 2, 2306 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); 2307 goto bad; 2308 } 2309 2310 /* RFC 2461 8.3 */ 2311 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT, 2312 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER); 2313 2314 m_put_rcvif_psref(ifp, &psref); 2315 ifp = NULL; 2316 2317 if (!is_onlink) { /* better router case. perform rtredirect. */ 2318 /* perform rtredirect */ 2319 struct sockaddr_in6 sdst; 2320 struct sockaddr_in6 sgw; 2321 struct sockaddr_in6 ssrc; 2322 unsigned long rtcount; 2323 struct rtentry *newrt = NULL; 2324 2325 /* 2326 * do not install redirect route, if the number of entries 2327 * is too much (> hiwat). note that, the node (= host) will 2328 * work just fine even if we do not install redirect route 2329 * (there will be additional hops, though). 2330 */ 2331 rtcount = rt_timer_count(icmp6_redirect_timeout_q); 2332 if (0 <= ip6_maxdynroutes && rtcount >= ip6_maxdynroutes) 2333 goto freeit; 2334 if (0 <= icmp6_redirect_hiwat && rtcount > icmp6_redirect_hiwat) 2335 goto freeit; 2336 else if (0 <= icmp6_redirect_lowat && 2337 rtcount > icmp6_redirect_lowat) { 2338 /* 2339 * XXX nuke a victim, install the new one. 2340 */ 2341 } 2342 2343 memset(&sdst, 0, sizeof(sdst)); 2344 memset(&sgw, 0, sizeof(sgw)); 2345 memset(&ssrc, 0, sizeof(ssrc)); 2346 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6; 2347 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len = 2348 sizeof(struct sockaddr_in6); 2349 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr)); 2350 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2351 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr)); 2352 rtredirect(sin6tosa(&sdst), sin6tosa(&sgw), NULL, 2353 RTF_GATEWAY | RTF_HOST, sin6tosa(&ssrc), 2354 &newrt); 2355 2356 if (newrt) { 2357 (void)rt_timer_add(newrt, icmp6_redirect_timeout, 2358 icmp6_redirect_timeout_q); 2359 rtfree(newrt); 2360 } 2361 } 2362 /* finally update cached route in each socket via pfctlinput */ 2363 { 2364 struct sockaddr_in6 sdst; 2365 2366 sockaddr_in6_init(&sdst, &reddst6, 0, 0, 0); 2367 pfctlinput(PRC_REDIRECT_HOST, sin6tosa(&sdst)); 2368 #if defined(IPSEC) 2369 if (ipsec_used) 2370 key_sa_routechange(sin6tosa(&sdst)); 2371 #endif 2372 } 2373 2374 freeit: 2375 if (ifp != NULL) 2376 m_put_rcvif_psref(ifp, &psref); 2377 m_freem(m); 2378 return; 2379 2380 bad: 2381 m_put_rcvif_psref(ifp, &psref); 2382 ICMP6_STATINC(ICMP6_STAT_BADREDIRECT); 2383 m_freem(m); 2384 } 2385 2386 void 2387 icmp6_redirect_output(struct mbuf *m0, struct rtentry *rt) 2388 { 2389 struct ifnet *ifp; /* my outgoing interface */ 2390 struct in6_addr *ifp_ll6; 2391 struct in6_addr *nexthop; 2392 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */ 2393 struct mbuf *m = NULL; /* newly allocated one */ 2394 struct ip6_hdr *ip6; /* m as struct ip6_hdr */ 2395 struct nd_redirect *nd_rd; 2396 size_t maxlen; 2397 u_char *p; 2398 struct sockaddr_in6 src_sa; 2399 2400 icmp6_errcount(ICMP6_STAT_OUTERRHIST, ND_REDIRECT, 0); 2401 2402 /* if we are not router, we don't send icmp6 redirect */ 2403 if (!ip6_forwarding) 2404 goto fail; 2405 2406 /* sanity check */ 2407 if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp)) 2408 goto fail; 2409 2410 /* 2411 * Address check: 2412 * the source address must identify a neighbor, and 2413 * the destination address must not be a multicast address 2414 * [RFC 2461, sec 8.2] 2415 */ 2416 sip6 = mtod(m0, struct ip6_hdr *); 2417 sockaddr_in6_init(&src_sa, &sip6->ip6_src, 0, 0, 0); 2418 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0) 2419 goto fail; 2420 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst)) 2421 goto fail; /* what should we do here? */ 2422 2423 /* rate limit */ 2424 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0)) 2425 goto fail; 2426 2427 /* 2428 * Since we are going to append up to 1280 bytes (= IPV6_MMTU), 2429 * we almost always ask for an mbuf cluster for simplicity. 2430 * (MHLEN < IPV6_MMTU is almost always true) 2431 */ 2432 MGETHDR(m, M_DONTWAIT, MT_HEADER); 2433 if (m && IPV6_MMTU >= MHLEN) { 2434 #if IPV6_MMTU >= MCLBYTES 2435 _MCLGET(m, mcl_cache, IPV6_MMTU, M_DONTWAIT); 2436 #else 2437 MCLGET(m, M_DONTWAIT); 2438 #endif 2439 } 2440 2441 if (!m) 2442 goto fail; 2443 m_reset_rcvif(m); 2444 m->m_len = 0; 2445 maxlen = M_TRAILINGSPACE(m); 2446 maxlen = min(IPV6_MMTU, maxlen); 2447 /* just for safety */ 2448 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) + 2449 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) { 2450 goto fail; 2451 } 2452 2453 { 2454 /* get ip6 linklocal address for ifp(my outgoing interface). */ 2455 struct in6_ifaddr *ia; 2456 int s = pserialize_read_enter(); 2457 if ((ia = in6ifa_ifpforlinklocal(ifp, 2458 IN6_IFF_NOTREADY| 2459 IN6_IFF_ANYCAST)) == NULL) { 2460 pserialize_read_exit(s); 2461 goto fail; 2462 } 2463 ifp_ll6 = &ia->ia_addr.sin6_addr; 2464 pserialize_read_exit(s); 2465 } 2466 2467 /* get ip6 linklocal address for the router. */ 2468 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) { 2469 struct sockaddr_in6 *sin6; 2470 sin6 = (struct sockaddr_in6 *)rt->rt_gateway; 2471 nexthop = &sin6->sin6_addr; 2472 if (!IN6_IS_ADDR_LINKLOCAL(nexthop)) 2473 nexthop = NULL; 2474 } else 2475 nexthop = NULL; 2476 2477 /* ip6 */ 2478 ip6 = mtod(m, struct ip6_hdr *); 2479 ip6->ip6_flow = 0; 2480 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2481 ip6->ip6_vfc |= IPV6_VERSION; 2482 /* ip6->ip6_plen will be set later */ 2483 ip6->ip6_nxt = IPPROTO_ICMPV6; 2484 ip6->ip6_hlim = 255; 2485 /* ip6->ip6_src must be linklocal addr for my outgoing if. */ 2486 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr)); 2487 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr)); 2488 2489 /* ND Redirect */ 2490 nd_rd = (struct nd_redirect *)(ip6 + 1); 2491 nd_rd->nd_rd_type = ND_REDIRECT; 2492 nd_rd->nd_rd_code = 0; 2493 nd_rd->nd_rd_reserved = 0; 2494 if (rt->rt_flags & RTF_GATEWAY) { 2495 /* 2496 * nd_rd->nd_rd_target must be a link-local address in 2497 * better router cases. 2498 */ 2499 if (!nexthop) 2500 goto fail; 2501 bcopy(nexthop, &nd_rd->nd_rd_target, 2502 sizeof(nd_rd->nd_rd_target)); 2503 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2504 sizeof(nd_rd->nd_rd_dst)); 2505 } else { 2506 /* make sure redtgt == reddst */ 2507 nexthop = &sip6->ip6_dst; 2508 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target, 2509 sizeof(nd_rd->nd_rd_target)); 2510 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2511 sizeof(nd_rd->nd_rd_dst)); 2512 } 2513 2514 p = (u_char *)(nd_rd + 1); 2515 2516 { 2517 /* target lladdr option */ 2518 struct llentry *ln = NULL; 2519 int len; 2520 struct nd_opt_hdr *nd_opt; 2521 char *lladdr; 2522 2523 ln = nd6_lookup(nexthop, ifp, false); 2524 if (ln == NULL) 2525 goto nolladdropt; 2526 len = sizeof(*nd_opt) + ifp->if_addrlen; 2527 len = (len + 7) & ~7; /* round by 8 */ 2528 /* safety check */ 2529 if (len + (p - (u_char *)ip6) > maxlen) { 2530 LLE_RUNLOCK(ln); 2531 goto nolladdropt; 2532 } 2533 if (ln->la_flags & LLE_VALID) { 2534 nd_opt = (struct nd_opt_hdr *)p; 2535 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 2536 nd_opt->nd_opt_len = len >> 3; 2537 lladdr = (char *)(nd_opt + 1); 2538 memcpy(lladdr, &ln->ll_addr, ifp->if_addrlen); 2539 p += len; 2540 } 2541 LLE_RUNLOCK(ln); 2542 } 2543 nolladdropt:; 2544 2545 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2546 2547 /* just to be safe */ 2548 if (m0->m_flags & M_DECRYPTED) 2549 goto noredhdropt; 2550 if (p - (u_char *)ip6 > maxlen) 2551 goto noredhdropt; 2552 2553 { 2554 /* redirected header option */ 2555 int len; 2556 struct nd_opt_rd_hdr *nd_opt_rh; 2557 2558 /* 2559 * compute the maximum size for icmp6 redirect header option. 2560 * XXX room for auth header? 2561 */ 2562 len = maxlen - (p - (u_char *)ip6); 2563 len &= ~7; 2564 2565 /* 2566 * Redirected header option spec (RFC2461 4.6.3) talks nothing 2567 * about padding/truncate rule for the original IP packet. 2568 * From the discussion on IPv6imp in Feb 1999, 2569 * the consensus was: 2570 * - "attach as much as possible" is the goal 2571 * - pad if not aligned (original size can be guessed by 2572 * original ip6 header) 2573 * Following code adds the padding if it is simple enough, 2574 * and truncates if not. 2575 */ 2576 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) { 2577 /* not enough room, truncate */ 2578 m_adj(m0, (len - sizeof(*nd_opt_rh)) - 2579 m0->m_pkthdr.len); 2580 } else { 2581 /* 2582 * enough room, truncate if not aligned. 2583 * we don't pad here for simplicity. 2584 */ 2585 size_t extra; 2586 2587 extra = m0->m_pkthdr.len % 8; 2588 if (extra) { 2589 /* truncate */ 2590 m_adj(m0, -extra); 2591 } 2592 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh); 2593 } 2594 2595 nd_opt_rh = (struct nd_opt_rd_hdr *)p; 2596 memset(nd_opt_rh, 0, sizeof(*nd_opt_rh)); 2597 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER; 2598 nd_opt_rh->nd_opt_rh_len = len >> 3; 2599 p += sizeof(*nd_opt_rh); 2600 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2601 2602 /* connect m0 to m */ 2603 m->m_pkthdr.len += m0->m_pkthdr.len; 2604 m_cat(m, m0); 2605 m0 = NULL; 2606 } 2607 noredhdropt: 2608 if (m0) { 2609 m_freem(m0); 2610 m0 = NULL; 2611 } 2612 2613 /* XXX: clear embedded link IDs in the inner header */ 2614 in6_clearscope(&sip6->ip6_src); 2615 in6_clearscope(&sip6->ip6_dst); 2616 in6_clearscope(&nd_rd->nd_rd_target); 2617 in6_clearscope(&nd_rd->nd_rd_dst); 2618 2619 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 2620 2621 nd_rd->nd_rd_cksum = 0; 2622 nd_rd->nd_rd_cksum 2623 = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen)); 2624 2625 /* send the packet to outside... */ 2626 if (ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL) != 0) 2627 icmp6_ifstat_inc(ifp, ifs6_out_error); 2628 2629 icmp6_ifstat_inc(ifp, ifs6_out_msg); 2630 icmp6_ifstat_inc(ifp, ifs6_out_redirect); 2631 ICMP6_STATINC(ICMP6_STAT_OUTHIST + ND_REDIRECT); 2632 2633 return; 2634 2635 fail: 2636 if (m) 2637 m_freem(m); 2638 if (m0) 2639 m_freem(m0); 2640 } 2641 2642 /* 2643 * ICMPv6 socket option processing. 2644 */ 2645 int 2646 icmp6_ctloutput(int op, struct socket *so, struct sockopt *sopt) 2647 { 2648 int error = 0; 2649 struct in6pcb *in6p = sotoin6pcb(so); 2650 2651 if (sopt->sopt_level != IPPROTO_ICMPV6) 2652 return rip6_ctloutput(op, so, sopt); 2653 2654 switch (op) { 2655 case PRCO_SETOPT: 2656 switch (sopt->sopt_name) { 2657 case ICMP6_FILTER: 2658 { 2659 struct icmp6_filter fil; 2660 2661 error = sockopt_get(sopt, &fil, sizeof(fil)); 2662 if (error) 2663 break; 2664 memcpy(in6p->in6p_icmp6filt, &fil, 2665 sizeof(struct icmp6_filter)); 2666 error = 0; 2667 break; 2668 } 2669 2670 default: 2671 error = ENOPROTOOPT; 2672 break; 2673 } 2674 break; 2675 2676 case PRCO_GETOPT: 2677 switch (sopt->sopt_name) { 2678 case ICMP6_FILTER: 2679 { 2680 if (in6p->in6p_icmp6filt == NULL) { 2681 error = EINVAL; 2682 break; 2683 } 2684 error = sockopt_set(sopt, in6p->in6p_icmp6filt, 2685 sizeof(struct icmp6_filter)); 2686 break; 2687 } 2688 2689 default: 2690 error = ENOPROTOOPT; 2691 break; 2692 } 2693 break; 2694 } 2695 2696 return (error); 2697 } 2698 2699 /* 2700 * Perform rate limit check. 2701 * Returns 0 if it is okay to send the icmp6 packet. 2702 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate 2703 * limitation. 2704 * 2705 * XXX per-destination/type check necessary? 2706 */ 2707 static int 2708 icmp6_ratelimit( 2709 const struct in6_addr *dst, /* not used at this moment */ 2710 const int type, /* not used at this moment */ 2711 const int code) /* not used at this moment */ 2712 { 2713 int ret; 2714 2715 ret = 0; /* okay to send */ 2716 2717 /* PPS limit */ 2718 if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count, 2719 icmp6errppslim)) { 2720 /* The packet is subject to rate limit */ 2721 ret++; 2722 } 2723 2724 return ret; 2725 } 2726 2727 static struct rtentry * 2728 icmp6_mtudisc_clone(struct sockaddr *dst) 2729 { 2730 struct rtentry *rt; 2731 int error; 2732 2733 rt = rtalloc1(dst, 1); 2734 if (rt == 0) 2735 return NULL; 2736 2737 /* If we didn't get a host route, allocate one */ 2738 if ((rt->rt_flags & RTF_HOST) == 0) { 2739 struct rtentry *nrt; 2740 2741 error = rtrequest(RTM_ADD, dst, rt->rt_gateway, NULL, 2742 RTF_GATEWAY | RTF_HOST | RTF_DYNAMIC, &nrt); 2743 if (error) { 2744 rtfree(rt); 2745 return NULL; 2746 } 2747 nrt->rt_rmx = rt->rt_rmx; 2748 rtfree(rt); 2749 rt = nrt; 2750 } 2751 error = rt_timer_add(rt, icmp6_mtudisc_timeout, 2752 icmp6_mtudisc_timeout_q); 2753 if (error) { 2754 rtfree(rt); 2755 return NULL; 2756 } 2757 2758 return rt; /* caller need to call rtfree() */ 2759 } 2760 2761 static void 2762 icmp6_mtudisc_timeout(struct rtentry *rt, struct rttimer *r) 2763 { 2764 2765 KASSERT(rt != NULL); 2766 rt_assert_referenced(rt); 2767 2768 if ((rt->rt_flags & (RTF_DYNAMIC | RTF_HOST)) == 2769 (RTF_DYNAMIC | RTF_HOST)) { 2770 rtrequest(RTM_DELETE, rt_getkey(rt), 2771 rt->rt_gateway, rt_mask(rt), rt->rt_flags, NULL); 2772 } else { 2773 if (!(rt->rt_rmx.rmx_locks & RTV_MTU)) 2774 rt->rt_rmx.rmx_mtu = 0; 2775 } 2776 } 2777 2778 static void 2779 icmp6_redirect_timeout(struct rtentry *rt, struct rttimer *r) 2780 { 2781 2782 KASSERT(rt != NULL); 2783 rt_assert_referenced(rt); 2784 2785 if ((rt->rt_flags & (RTF_GATEWAY | RTF_DYNAMIC | RTF_HOST)) == 2786 (RTF_GATEWAY | RTF_DYNAMIC | RTF_HOST)) { 2787 rtrequest(RTM_DELETE, rt_getkey(rt), 2788 rt->rt_gateway, rt_mask(rt), rt->rt_flags, NULL); 2789 } 2790 } 2791 2792 /* 2793 * sysctl helper routine for the net.inet6.icmp6.nd6 nodes. silly? 2794 */ 2795 static int 2796 sysctl_net_inet6_icmp6_nd6(SYSCTLFN_ARGS) 2797 { 2798 (void)&name; 2799 (void)&l; 2800 (void)&oname; 2801 2802 if (namelen != 0) 2803 return (EINVAL); 2804 2805 return (nd6_sysctl(rnode->sysctl_num, oldp, oldlenp, 2806 /*XXXUNCONST*/ 2807 __UNCONST(newp), newlen)); 2808 } 2809 2810 static int 2811 sysctl_net_inet6_icmp6_stats(SYSCTLFN_ARGS) 2812 { 2813 2814 return (NETSTAT_SYSCTL(icmp6stat_percpu, ICMP6_NSTATS)); 2815 } 2816 2817 static int 2818 sysctl_net_inet6_icmp6_redirtimeout(SYSCTLFN_ARGS) 2819 { 2820 int error, tmp; 2821 struct sysctlnode node; 2822 2823 node = *rnode; 2824 node.sysctl_data = &tmp; 2825 tmp = icmp6_redirtimeout; 2826 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 2827 if (error || newp == NULL) 2828 return error; 2829 if (tmp < 0) 2830 return EINVAL; 2831 icmp6_redirtimeout = tmp; 2832 2833 if (icmp6_redirect_timeout_q != NULL) { 2834 if (icmp6_redirtimeout == 0) { 2835 rt_timer_queue_destroy(icmp6_redirect_timeout_q, 2836 true); 2837 } else { 2838 rt_timer_queue_change(icmp6_redirect_timeout_q, 2839 icmp6_redirtimeout); 2840 } 2841 } else if (icmp6_redirtimeout > 0) { 2842 icmp6_redirect_timeout_q = 2843 rt_timer_queue_create(icmp6_redirtimeout); 2844 } 2845 2846 return 0; 2847 } 2848 2849 static void 2850 sysctl_net_inet6_icmp6_setup(struct sysctllog **clog) 2851 { 2852 extern int nd6_maxqueuelen; /* defined in nd6.c */ 2853 2854 sysctl_createv(clog, 0, NULL, NULL, 2855 CTLFLAG_PERMANENT, 2856 CTLTYPE_NODE, "inet6", NULL, 2857 NULL, 0, NULL, 0, 2858 CTL_NET, PF_INET6, CTL_EOL); 2859 sysctl_createv(clog, 0, NULL, NULL, 2860 CTLFLAG_PERMANENT, 2861 CTLTYPE_NODE, "icmp6", 2862 SYSCTL_DESCR("ICMPv6 related settings"), 2863 NULL, 0, NULL, 0, 2864 CTL_NET, PF_INET6, IPPROTO_ICMPV6, CTL_EOL); 2865 2866 sysctl_createv(clog, 0, NULL, NULL, 2867 CTLFLAG_PERMANENT, 2868 CTLTYPE_STRUCT, "stats", 2869 SYSCTL_DESCR("ICMPv6 transmission statistics"), 2870 sysctl_net_inet6_icmp6_stats, 0, NULL, 0, 2871 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2872 ICMPV6CTL_STATS, CTL_EOL); 2873 sysctl_createv(clog, 0, NULL, NULL, 2874 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2875 CTLTYPE_INT, "rediraccept", 2876 SYSCTL_DESCR("Accept and process redirect messages"), 2877 NULL, 0, &icmp6_rediraccept, 0, 2878 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2879 ICMPV6CTL_REDIRACCEPT, CTL_EOL); 2880 sysctl_createv(clog, 0, NULL, NULL, 2881 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2882 CTLTYPE_INT, "redirtimeout", 2883 SYSCTL_DESCR("Redirect generated route lifetime"), 2884 sysctl_net_inet6_icmp6_redirtimeout, 0, 2885 &icmp6_redirtimeout, 0, 2886 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2887 ICMPV6CTL_REDIRTIMEOUT, CTL_EOL); 2888 #if 0 /* obsoleted */ 2889 sysctl_createv(clog, 0, NULL, NULL, 2890 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2891 CTLTYPE_INT, "errratelimit", NULL, 2892 NULL, 0, &icmp6_errratelimit, 0, 2893 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2894 ICMPV6CTL_ERRRATELIMIT, CTL_EOL); 2895 #endif 2896 sysctl_createv(clog, 0, NULL, NULL, 2897 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2898 CTLTYPE_INT, "nd6_prune", 2899 SYSCTL_DESCR("Neighbor discovery prune interval"), 2900 NULL, 0, &nd6_prune, 0, 2901 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2902 ICMPV6CTL_ND6_PRUNE, CTL_EOL); 2903 sysctl_createv(clog, 0, NULL, NULL, 2904 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2905 CTLTYPE_INT, "nd6_delay", 2906 SYSCTL_DESCR("First probe delay time"), 2907 NULL, 0, &nd6_delay, 0, 2908 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2909 ICMPV6CTL_ND6_DELAY, CTL_EOL); 2910 sysctl_createv(clog, 0, NULL, NULL, 2911 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2912 CTLTYPE_INT, "nd6_umaxtries", 2913 SYSCTL_DESCR("Number of unicast discovery attempts"), 2914 NULL, 0, &nd6_umaxtries, 0, 2915 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2916 ICMPV6CTL_ND6_UMAXTRIES, CTL_EOL); 2917 sysctl_createv(clog, 0, NULL, NULL, 2918 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2919 CTLTYPE_INT, "nd6_mmaxtries", 2920 SYSCTL_DESCR("Number of multicast discovery attempts"), 2921 NULL, 0, &nd6_mmaxtries, 0, 2922 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2923 ICMPV6CTL_ND6_MMAXTRIES, CTL_EOL); 2924 sysctl_createv(clog, 0, NULL, NULL, 2925 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2926 CTLTYPE_INT, "nd6_useloopback", 2927 SYSCTL_DESCR("Use loopback interface for local traffic"), 2928 NULL, 0, &nd6_useloopback, 0, 2929 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2930 ICMPV6CTL_ND6_USELOOPBACK, CTL_EOL); 2931 #if 0 /* obsoleted */ 2932 sysctl_createv(clog, 0, NULL, NULL, 2933 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2934 CTLTYPE_INT, "nd6_proxyall", NULL, 2935 NULL, 0, &nd6_proxyall, 0, 2936 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2937 ICMPV6CTL_ND6_PROXYALL, CTL_EOL); 2938 #endif 2939 sysctl_createv(clog, 0, NULL, NULL, 2940 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2941 CTLTYPE_INT, "nodeinfo", 2942 SYSCTL_DESCR("Respond to node information requests"), 2943 NULL, 0, &icmp6_nodeinfo, 0, 2944 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2945 ICMPV6CTL_NODEINFO, CTL_EOL); 2946 sysctl_createv(clog, 0, NULL, NULL, 2947 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2948 CTLTYPE_INT, "errppslimit", 2949 SYSCTL_DESCR("Maximum ICMP errors sent per second"), 2950 NULL, 0, &icmp6errppslim, 0, 2951 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2952 ICMPV6CTL_ERRPPSLIMIT, CTL_EOL); 2953 sysctl_createv(clog, 0, NULL, NULL, 2954 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2955 CTLTYPE_INT, "nd6_maxnudhint", 2956 SYSCTL_DESCR("Maximum neighbor unreachable hint count"), 2957 NULL, 0, &nd6_maxnudhint, 0, 2958 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2959 ICMPV6CTL_ND6_MAXNUDHINT, CTL_EOL); 2960 sysctl_createv(clog, 0, NULL, NULL, 2961 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2962 CTLTYPE_INT, "mtudisc_hiwat", 2963 SYSCTL_DESCR("Low mark on MTU Discovery route timers"), 2964 NULL, 0, &icmp6_mtudisc_hiwat, 0, 2965 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2966 ICMPV6CTL_MTUDISC_HIWAT, CTL_EOL); 2967 sysctl_createv(clog, 0, NULL, NULL, 2968 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2969 CTLTYPE_INT, "mtudisc_lowat", 2970 SYSCTL_DESCR("Low mark on MTU Discovery route timers"), 2971 NULL, 0, &icmp6_mtudisc_lowat, 0, 2972 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2973 ICMPV6CTL_MTUDISC_LOWAT, CTL_EOL); 2974 sysctl_createv(clog, 0, NULL, NULL, 2975 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2976 CTLTYPE_INT, "nd6_debug", 2977 SYSCTL_DESCR("Enable neighbor discovery debug output"), 2978 NULL, 0, &nd6_debug, 0, 2979 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2980 ICMPV6CTL_ND6_DEBUG, CTL_EOL); 2981 sysctl_createv(clog, 0, NULL, NULL, 2982 CTLFLAG_PERMANENT, 2983 CTLTYPE_STRUCT, "nd6_drlist", 2984 SYSCTL_DESCR("Default router list"), 2985 sysctl_net_inet6_icmp6_nd6, 0, NULL, 0, 2986 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2987 ICMPV6CTL_ND6_DRLIST, CTL_EOL); 2988 sysctl_createv(clog, 0, NULL, NULL, 2989 CTLFLAG_PERMANENT, 2990 CTLTYPE_STRUCT, "nd6_prlist", 2991 SYSCTL_DESCR("Prefix list"), 2992 sysctl_net_inet6_icmp6_nd6, 0, NULL, 0, 2993 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2994 ICMPV6CTL_ND6_PRLIST, CTL_EOL); 2995 sysctl_createv(clog, 0, NULL, NULL, 2996 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2997 CTLTYPE_INT, "maxqueuelen", 2998 SYSCTL_DESCR("max packet queue len for a unresolved ND"), 2999 NULL, 1, &nd6_maxqueuelen, 0, 3000 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3001 ICMPV6CTL_ND6_MAXQLEN, CTL_EOL); 3002 } 3003 3004 void 3005 icmp6_statinc(u_int stat) 3006 { 3007 3008 KASSERT(stat < ICMP6_NSTATS); 3009 ICMP6_STATINC(stat); 3010 } 3011