icmp6.c revision 1.202
1/* $NetBSD: icmp6.c,v 1.202 2016/12/11 07:35:42 ozaki-r 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 1.202 2016/12/11 07:35:42 ozaki-r 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 117extern struct domain inet6domain; 118 119percpu_t *icmp6stat_percpu; 120 121extern struct inpcbtable raw6cbtable; 122extern int icmp6errppslim; 123static int icmp6errpps_count = 0; 124static struct timeval icmp6errppslim_last; 125extern int icmp6_nodeinfo; 126 127/* 128 * List of callbacks to notify when Path MTU changes are made. 129 */ 130struct icmp6_mtudisc_callback { 131 LIST_ENTRY(icmp6_mtudisc_callback) mc_list; 132 void (*mc_func)(struct in6_addr *); 133}; 134 135LIST_HEAD(, icmp6_mtudisc_callback) icmp6_mtudisc_callbacks = 136 LIST_HEAD_INITIALIZER(&icmp6_mtudisc_callbacks); 137 138static struct rttimer_queue *icmp6_mtudisc_timeout_q = NULL; 139extern int pmtu_expire; 140 141/* XXX do these values make any sense? */ 142static int icmp6_mtudisc_hiwat = 1280; 143static int icmp6_mtudisc_lowat = 256; 144 145/* 146 * keep track of # of redirect routes. 147 */ 148static struct rttimer_queue *icmp6_redirect_timeout_q = NULL; 149 150/* XXX experimental, turned off */ 151static int icmp6_redirect_hiwat = -1; 152static int icmp6_redirect_lowat = -1; 153 154static void icmp6_errcount(u_int, int, int); 155static int icmp6_rip6_input(struct mbuf **, int); 156static int icmp6_ratelimit(const struct in6_addr *, const int, const int); 157static const char *icmp6_redirect_diag(struct in6_addr *, 158 struct in6_addr *, struct in6_addr *); 159static struct mbuf *ni6_input(struct mbuf *, int); 160static struct mbuf *ni6_nametodns(const char *, int, int); 161static int ni6_dnsmatch(const char *, int, const char *, int); 162static int ni6_addrs(struct icmp6_nodeinfo *, struct mbuf *, 163 struct ifnet **, char *, struct psref *); 164static int ni6_store_addrs(struct icmp6_nodeinfo *, struct icmp6_nodeinfo *, 165 struct ifnet *, int); 166static int icmp6_notify_error(struct mbuf *, int, int, int); 167static struct rtentry *icmp6_mtudisc_clone(struct sockaddr *); 168static void icmp6_mtudisc_timeout(struct rtentry *, struct rttimer *); 169static void icmp6_redirect_timeout(struct rtentry *, struct rttimer *); 170static void sysctl_net_inet6_icmp6_setup(struct sysctllog **); 171 172 173void 174icmp6_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 185static void 186icmp6_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 */ 247void 248icmp6_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 */ 267void 268icmp6_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 */ 295void 296icmp6_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 */ 447int 448icmp6_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 /* 486 * Enforce alignment requirements that are violated in 487 * some cases, see kern/50766 for details. 488 */ 489 if (IP6_HDR_ALIGNED_P(icmp6) == 0) { 490 m = m_copyup(m, off + sizeof(struct icmp6_hdr), 0); 491 if (m == NULL) { 492 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 493 icmp6_ifstat_inc(rcvif, ifs6_in_error); 494 goto freeit; 495 } 496 ip6 = mtod(m, struct ip6_hdr *); 497 icmp6 = (struct icmp6_hdr *)(ip6 + 1); 498 } 499 KASSERT(IP6_HDR_ALIGNED_P(icmp6)); 500 501 /* 502 * calculate the checksum 503 */ 504 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) { 505 nd6log(LOG_ERR, "ICMP6 checksum error(%d|%x) %s\n", 506 icmp6->icmp6_type, sum, ip6_sprintf(&ip6->ip6_src)); 507 ICMP6_STATINC(ICMP6_STAT_CHECKSUM); 508 icmp6_ifstat_inc(rcvif, ifs6_in_error); 509 goto freeit; 510 } 511 512#if defined(NFAITH) && 0 < NFAITH 513 if (faithprefix(&ip6->ip6_dst)) { 514 /* 515 * Deliver very specific ICMP6 type only. 516 * This is important to deliver TOOBIG. Otherwise PMTUD 517 * will not work. 518 */ 519 switch (icmp6->icmp6_type) { 520 case ICMP6_DST_UNREACH: 521 case ICMP6_PACKET_TOO_BIG: 522 case ICMP6_TIME_EXCEEDED: 523 break; 524 default: 525 goto freeit; 526 } 527 } 528#endif 529 530 code = icmp6->icmp6_code; 531 ICMP6_STATINC(ICMP6_STAT_INHIST + icmp6->icmp6_type); 532 533 switch (icmp6->icmp6_type) { 534 case ICMP6_DST_UNREACH: 535 icmp6_ifstat_inc(rcvif, ifs6_in_dstunreach); 536 switch (code) { 537 case ICMP6_DST_UNREACH_NOROUTE: 538 code = PRC_UNREACH_NET; 539 break; 540 case ICMP6_DST_UNREACH_ADMIN: 541 icmp6_ifstat_inc(rcvif, ifs6_in_adminprohib); 542 code = PRC_UNREACH_PROTOCOL; /* is this a good code? */ 543 break; 544 case ICMP6_DST_UNREACH_ADDR: 545 code = PRC_HOSTDEAD; 546 break; 547#ifdef COMPAT_RFC1885 548 case ICMP6_DST_UNREACH_NOTNEIGHBOR: 549 code = PRC_UNREACH_SRCFAIL; 550 break; 551#else 552 case ICMP6_DST_UNREACH_BEYONDSCOPE: 553 /* I mean "source address was incorrect." */ 554 code = PRC_UNREACH_NET; 555 break; 556#endif 557 case ICMP6_DST_UNREACH_NOPORT: 558 code = PRC_UNREACH_PORT; 559 break; 560 default: 561 goto badcode; 562 } 563 goto deliver; 564 565 case ICMP6_PACKET_TOO_BIG: 566 icmp6_ifstat_inc(rcvif, ifs6_in_pkttoobig); 567 568 /* 569 * MTU is checked in icmp6_mtudisc. 570 */ 571 code = PRC_MSGSIZE; 572 573 /* 574 * Updating the path MTU will be done after examining 575 * intermediate extension headers. 576 */ 577 goto deliver; 578 579 case ICMP6_TIME_EXCEEDED: 580 icmp6_ifstat_inc(rcvif, ifs6_in_timeexceed); 581 switch (code) { 582 case ICMP6_TIME_EXCEED_TRANSIT: 583 code = PRC_TIMXCEED_INTRANS; 584 break; 585 case ICMP6_TIME_EXCEED_REASSEMBLY: 586 code = PRC_TIMXCEED_REASS; 587 break; 588 default: 589 goto badcode; 590 } 591 goto deliver; 592 593 case ICMP6_PARAM_PROB: 594 icmp6_ifstat_inc(rcvif, ifs6_in_paramprob); 595 switch (code) { 596 case ICMP6_PARAMPROB_NEXTHEADER: 597 code = PRC_UNREACH_PROTOCOL; 598 break; 599 case ICMP6_PARAMPROB_HEADER: 600 case ICMP6_PARAMPROB_OPTION: 601 code = PRC_PARAMPROB; 602 break; 603 default: 604 goto badcode; 605 } 606 goto deliver; 607 608 case ICMP6_ECHO_REQUEST: 609 icmp6_ifstat_inc(rcvif, ifs6_in_echo); 610 if (code != 0) 611 goto badcode; 612 /* 613 * Copy mbuf to send to two data paths: userland socket(s), 614 * and to the querier (echo reply). 615 * m: a copy for socket, n: a copy for querier 616 * 617 * If the first mbuf is shared, or the first mbuf is too short, 618 * copy the first part of the data into a fresh mbuf. 619 * Otherwise, we will wrongly overwrite both copies. 620 */ 621 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 622 /* Give up local */ 623 n = m; 624 m = NULL; 625 } else if (M_READONLY(n) || 626 n->m_len < off + sizeof(struct icmp6_hdr)) { 627 struct mbuf *n0 = n; 628 629 /* 630 * Prepare an internal mbuf. m_pullup() doesn't 631 * always copy the length we specified. 632 */ 633 if ((n = m_dup(n0, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 634 /* Give up local */ 635 n = m; 636 m = NULL; 637 } 638 m_freem(n0); 639 } 640 IP6_EXTHDR_GET(nicmp6, struct icmp6_hdr *, n, off, 641 sizeof(*nicmp6)); 642 if (nicmp6 == NULL) 643 goto freeit; 644 nicmp6->icmp6_type = ICMP6_ECHO_REPLY; 645 nicmp6->icmp6_code = 0; 646 if (n) { 647 uint64_t *icmp6s = ICMP6_STAT_GETREF(); 648 icmp6s[ICMP6_STAT_REFLECT]++; 649 icmp6s[ICMP6_STAT_OUTHIST + ICMP6_ECHO_REPLY]++; 650 ICMP6_STAT_PUTREF(); 651 icmp6_reflect(n, off); 652 } 653 if (!m) 654 goto freeit; 655 break; 656 657 case ICMP6_ECHO_REPLY: 658 icmp6_ifstat_inc(rcvif, ifs6_in_echoreply); 659 if (code != 0) 660 goto badcode; 661 break; 662 663 case MLD_LISTENER_QUERY: 664 case MLD_LISTENER_REPORT: 665 if (icmp6len < sizeof(struct mld_hdr)) 666 goto badlen; 667 if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */ 668 icmp6_ifstat_inc(rcvif, ifs6_in_mldquery); 669 else 670 icmp6_ifstat_inc(rcvif, ifs6_in_mldreport); 671 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 672 /* give up local */ 673 mld_input(m, off); 674 m = NULL; 675 goto freeit; 676 } 677 mld_input(n, off); 678 /* m stays. */ 679 break; 680 681 case MLD_LISTENER_DONE: 682 icmp6_ifstat_inc(rcvif, ifs6_in_mlddone); 683 if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */ 684 goto badlen; 685 break; /* nothing to be done in kernel */ 686 687 case MLD_MTRACE_RESP: 688 case MLD_MTRACE: 689 /* XXX: these two are experimental. not officially defined. */ 690 /* XXX: per-interface statistics? */ 691 break; /* just pass it to applications */ 692 693 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */ 694 { 695 enum { WRU, FQDN } mode; 696 697 if (!icmp6_nodeinfo) 698 break; 699 700 if (icmp6len == sizeof(struct icmp6_hdr) + 4) 701 mode = WRU; 702 else if (icmp6len >= sizeof(struct icmp6_nodeinfo)) 703 mode = FQDN; 704 else 705 goto badlen; 706 707 if (mode == FQDN) { 708 n = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 709 if (n) 710 n = ni6_input(n, off); 711 /* XXX meaningless if n == NULL */ 712 noff = sizeof(struct ip6_hdr); 713 } else { 714 u_char *p; 715 int maxhlen; 716 717 if ((icmp6_nodeinfo & 5) != 5) 718 break; 719 720 if (code != 0) 721 goto badcode; 722 MGETHDR(n, M_DONTWAIT, m->m_type); 723 if (n && ICMP6_MAXLEN > MHLEN) { 724 MCLGET(n, M_DONTWAIT); 725 if ((n->m_flags & M_EXT) == 0) { 726 m_free(n); 727 n = NULL; 728 } 729 } 730 if (n == NULL) { 731 /* Give up remote */ 732 break; 733 } 734 m_reset_rcvif(n); 735 n->m_len = 0; 736 maxhlen = M_TRAILINGSPACE(n) - ICMP6_MAXLEN; 737 if (maxhlen < 0) 738 break; 739 if (maxhlen > hostnamelen) 740 maxhlen = hostnamelen; 741 /* 742 * Copy IPv6 and ICMPv6 only. 743 */ 744 nip6 = mtod(n, struct ip6_hdr *); 745 bcopy(ip6, nip6, sizeof(struct ip6_hdr)); 746 nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 747 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); 748 p = (u_char *)(nicmp6 + 1); 749 memset(p, 0, 4); 750 bcopy(hostname, p + 4, maxhlen); /* meaningless TTL */ 751 noff = sizeof(struct ip6_hdr); 752 M_COPY_PKTHDR(n, m); /* just for rcvif */ 753 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 754 sizeof(struct icmp6_hdr) + 4 + maxhlen; 755 nicmp6->icmp6_type = ICMP6_WRUREPLY; 756 nicmp6->icmp6_code = 0; 757 } 758#undef hostnamelen 759 if (n) { 760 uint64_t *icmp6s = ICMP6_STAT_GETREF(); 761 icmp6s[ICMP6_STAT_REFLECT]++; 762 icmp6s[ICMP6_STAT_OUTHIST + ICMP6_WRUREPLY]++; 763 ICMP6_STAT_PUTREF(); 764 icmp6_reflect(n, noff); 765 } 766 break; 767 } 768 769 case ICMP6_WRUREPLY: 770 if (code != 0) 771 goto badcode; 772 break; 773 774 case ND_ROUTER_SOLICIT: 775 icmp6_ifstat_inc(rcvif, ifs6_in_routersolicit); 776 if (code != 0) 777 goto badcode; 778 if (icmp6len < sizeof(struct nd_router_solicit)) 779 goto badlen; 780 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 781 /* give up local */ 782 nd6_rs_input(m, off, icmp6len); 783 m = NULL; 784 goto freeit; 785 } 786 nd6_rs_input(n, off, icmp6len); 787 /* m stays. */ 788 break; 789 790 case ND_ROUTER_ADVERT: 791 icmp6_ifstat_inc(rcvif, ifs6_in_routeradvert); 792 if (code != 0) 793 goto badcode; 794 if (icmp6len < sizeof(struct nd_router_advert)) 795 goto badlen; 796 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 797 /* give up local */ 798 nd6_ra_input(m, off, icmp6len); 799 m = NULL; 800 goto freeit; 801 } 802 nd6_ra_input(n, off, icmp6len); 803 /* m stays. */ 804 break; 805 806 case ND_NEIGHBOR_SOLICIT: 807 icmp6_ifstat_inc(rcvif, ifs6_in_neighborsolicit); 808 if (code != 0) 809 goto badcode; 810 if (icmp6len < sizeof(struct nd_neighbor_solicit)) 811 goto badlen; 812 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 813 /* give up local */ 814 nd6_ns_input(m, off, icmp6len); 815 m = NULL; 816 goto freeit; 817 } 818 nd6_ns_input(n, off, icmp6len); 819 /* m stays. */ 820 break; 821 822 case ND_NEIGHBOR_ADVERT: 823 icmp6_ifstat_inc(rcvif, ifs6_in_neighboradvert); 824 if (code != 0) 825 goto badcode; 826 if (icmp6len < sizeof(struct nd_neighbor_advert)) 827 goto badlen; 828 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 829 /* give up local */ 830 nd6_na_input(m, off, icmp6len); 831 m = NULL; 832 goto freeit; 833 } 834 nd6_na_input(n, off, icmp6len); 835 /* m stays. */ 836 break; 837 838 case ND_REDIRECT: 839 icmp6_ifstat_inc(rcvif, ifs6_in_redirect); 840 if (code != 0) 841 goto badcode; 842 if (icmp6len < sizeof(struct nd_redirect)) 843 goto badlen; 844 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 845 /* give up local */ 846 icmp6_redirect_input(m, off); 847 m = NULL; 848 goto freeit; 849 } 850 icmp6_redirect_input(n, off); 851 /* m stays. */ 852 break; 853 854 case ICMP6_ROUTER_RENUMBERING: 855 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND && 856 code != ICMP6_ROUTER_RENUMBERING_RESULT) 857 goto badcode; 858 if (icmp6len < sizeof(struct icmp6_router_renum)) 859 goto badlen; 860 break; 861 862 default: 863 nd6log(LOG_DEBUG, "unknown type %d(src=%s, dst=%s, ifid=%d)\n", 864 icmp6->icmp6_type, ip6_sprintf(&ip6->ip6_src), 865 ip6_sprintf(&ip6->ip6_dst), 866 rcvif ? rcvif->if_index : 0); 867 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) { 868 /* ICMPv6 error: MUST deliver it by spec... */ 869 code = PRC_NCMDS; 870 /* deliver */ 871 } else { 872 /* ICMPv6 informational: MUST not deliver */ 873 break; 874 } 875 deliver: 876 if (icmp6_notify_error(m, off, icmp6len, code)) { 877 /* In this case, m should've been freed. */ 878 m_put_rcvif_psref(rcvif, &psref); 879 return (IPPROTO_DONE); 880 } 881 break; 882 883 badcode: 884 ICMP6_STATINC(ICMP6_STAT_BADCODE); 885 break; 886 887 badlen: 888 ICMP6_STATINC(ICMP6_STAT_BADLEN); 889 break; 890 } 891 m_put_rcvif_psref(rcvif, &psref); 892 893 /* deliver the packet to appropriate sockets */ 894 icmp6_rip6_input(&m, *offp); 895 896 return IPPROTO_DONE; 897 898 freeit: 899 m_put_rcvif_psref(rcvif, &psref); 900 m_freem(m); 901 return IPPROTO_DONE; 902} 903 904static int 905icmp6_notify_error(struct mbuf *m, int off, int icmp6len, int code) 906{ 907 struct icmp6_hdr *icmp6; 908 struct ip6_hdr *eip6; 909 u_int32_t notifymtu; 910 struct sockaddr_in6 icmp6src, icmp6dst; 911 912 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) { 913 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 914 goto freeit; 915 } 916 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 917 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 918 if (icmp6 == NULL) { 919 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 920 return (-1); 921 } 922 eip6 = (struct ip6_hdr *)(icmp6 + 1); 923 924 /* Detect the upper level protocol */ 925 { 926 void (*ctlfunc)(int, struct sockaddr *, void *); 927 u_int8_t nxt = eip6->ip6_nxt; 928 int eoff = off + sizeof(struct icmp6_hdr) + 929 sizeof(struct ip6_hdr); 930 struct ip6ctlparam ip6cp; 931 struct in6_addr *finaldst = NULL; 932 int icmp6type = icmp6->icmp6_type; 933 struct ip6_frag *fh; 934 struct ip6_rthdr *rth; 935 struct ip6_rthdr0 *rth0; 936 int rthlen; 937 struct ifnet *rcvif; 938 int s; 939 940 while (1) { /* XXX: should avoid infinite loop explicitly? */ 941 struct ip6_ext *eh; 942 943 switch (nxt) { 944 case IPPROTO_HOPOPTS: 945 case IPPROTO_DSTOPTS: 946 case IPPROTO_AH: 947 IP6_EXTHDR_GET(eh, struct ip6_ext *, m, 948 eoff, sizeof(*eh)); 949 if (eh == NULL) { 950 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 951 return (-1); 952 } 953 954 if (nxt == IPPROTO_AH) 955 eoff += (eh->ip6e_len + 2) << 2; 956 else 957 eoff += (eh->ip6e_len + 1) << 3; 958 nxt = eh->ip6e_nxt; 959 break; 960 case IPPROTO_ROUTING: 961 /* 962 * When the erroneous packet contains a 963 * routing header, we should examine the 964 * header to determine the final destination. 965 * Otherwise, we can't properly update 966 * information that depends on the final 967 * destination (e.g. path MTU). 968 */ 969 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m, 970 eoff, sizeof(*rth)); 971 if (rth == NULL) { 972 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 973 return (-1); 974 } 975 rthlen = (rth->ip6r_len + 1) << 3; 976 /* 977 * XXX: currently there is no 978 * officially defined type other 979 * than type-0. 980 * Note that if the segment left field 981 * is 0, all intermediate hops must 982 * have been passed. 983 */ 984 if (rth->ip6r_segleft && 985 rth->ip6r_type == IPV6_RTHDR_TYPE_0) { 986 int hops; 987 988 IP6_EXTHDR_GET(rth0, 989 struct ip6_rthdr0 *, m, 990 eoff, rthlen); 991 if (rth0 == NULL) { 992 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 993 return (-1); 994 } 995 /* just ignore a bogus header */ 996 if ((rth0->ip6r0_len % 2) == 0 && 997 (hops = rth0->ip6r0_len/2)) 998 finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1); 999 } 1000 eoff += rthlen; 1001 nxt = rth->ip6r_nxt; 1002 break; 1003 case IPPROTO_FRAGMENT: 1004 IP6_EXTHDR_GET(fh, struct ip6_frag *, m, 1005 eoff, sizeof(*fh)); 1006 if (fh == NULL) { 1007 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 1008 return (-1); 1009 } 1010 /* 1011 * Data after a fragment header is meaningless 1012 * unless it is the first fragment, but 1013 * we'll go to the notify label for path MTU 1014 * discovery. 1015 */ 1016 if (fh->ip6f_offlg & IP6F_OFF_MASK) 1017 goto notify; 1018 1019 eoff += sizeof(struct ip6_frag); 1020 nxt = fh->ip6f_nxt; 1021 break; 1022 default: 1023 /* 1024 * This case includes ESP and the No Next 1025 * Header. In such cases going to the notify 1026 * label does not have any meaning 1027 * (i.e. ctlfunc will be NULL), but we go 1028 * anyway since we might have to update 1029 * path MTU information. 1030 */ 1031 goto notify; 1032 } 1033 } 1034 notify: 1035 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 1036 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 1037 if (icmp6 == NULL) { 1038 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 1039 return (-1); 1040 } 1041 1042 /* 1043 * retrieve parameters from the inner IPv6 header, and convert 1044 * them into sockaddr structures. 1045 * XXX: there is no guarantee that the source or destination 1046 * addresses of the inner packet are in the same scope zone as 1047 * the addresses of the icmp packet. But there is no other 1048 * way to determine the zone. 1049 */ 1050 eip6 = (struct ip6_hdr *)(icmp6 + 1); 1051 1052 rcvif = m_get_rcvif(m, &s); 1053 sockaddr_in6_init(&icmp6dst, 1054 (finaldst == NULL) ? &eip6->ip6_dst : finaldst, 0, 0, 0); 1055 if (in6_setscope(&icmp6dst.sin6_addr, rcvif, NULL)) { 1056 m_put_rcvif(rcvif, &s); 1057 goto freeit; 1058 } 1059 sockaddr_in6_init(&icmp6src, &eip6->ip6_src, 0, 0, 0); 1060 if (in6_setscope(&icmp6src.sin6_addr, rcvif, NULL)) { 1061 m_put_rcvif(rcvif, &s); 1062 goto freeit; 1063 } 1064 m_put_rcvif(rcvif, &s); 1065 1066 icmp6src.sin6_flowinfo = 1067 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK); 1068 1069 if (finaldst == NULL) 1070 finaldst = &eip6->ip6_dst; 1071 ip6cp.ip6c_m = m; 1072 ip6cp.ip6c_icmp6 = icmp6; 1073 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1); 1074 ip6cp.ip6c_off = eoff; 1075 ip6cp.ip6c_finaldst = finaldst; 1076 ip6cp.ip6c_src = &icmp6src; 1077 ip6cp.ip6c_nxt = nxt; 1078 1079 if (icmp6type == ICMP6_PACKET_TOO_BIG) { 1080 notifymtu = ntohl(icmp6->icmp6_mtu); 1081 ip6cp.ip6c_cmdarg = (void *)¬ifymtu; 1082 } 1083 1084 ctlfunc = (void (*)(int, struct sockaddr *, void *)) 1085 (inet6sw[ip6_protox[nxt]].pr_ctlinput); 1086 if (ctlfunc) { 1087 (void) (*ctlfunc)(code, sin6tosa(&icmp6dst), 1088 &ip6cp); 1089 } 1090 } 1091 return (0); 1092 1093 freeit: 1094 m_freem(m); 1095 return (-1); 1096} 1097 1098void 1099icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated) 1100{ 1101 unsigned long rtcount; 1102 struct icmp6_mtudisc_callback *mc; 1103 struct in6_addr *dst = ip6cp->ip6c_finaldst; 1104 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6; 1105 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */ 1106 u_int mtu = ntohl(icmp6->icmp6_mtu); 1107 struct rtentry *rt = NULL; 1108 struct sockaddr_in6 sin6; 1109 struct ifnet *rcvif; 1110 int s; 1111 1112 /* 1113 * The MTU should not be less than the minimal IPv6 MTU except for the 1114 * hack in ip6_output/ip6_setpmtu where we always include a frag header. 1115 * In that one case, the MTU might be less than 1280. 1116 */ 1117 if (__predict_false(mtu < IPV6_MMTU - sizeof(struct ip6_frag))) { 1118 /* is the mtu even sane? */ 1119 if (mtu < sizeof(struct ip6_hdr) + sizeof(struct ip6_frag) + 8) 1120 return; 1121 if (!validated) 1122 return; 1123 mtu = IPV6_MMTU - sizeof(struct ip6_frag); 1124 } 1125 1126 /* 1127 * allow non-validated cases if memory is plenty, to make traffic 1128 * from non-connected pcb happy. 1129 */ 1130 rtcount = rt_timer_count(icmp6_mtudisc_timeout_q); 1131 if (validated) { 1132 if (0 <= icmp6_mtudisc_hiwat && rtcount > icmp6_mtudisc_hiwat) 1133 return; 1134 else if (0 <= icmp6_mtudisc_lowat && 1135 rtcount > icmp6_mtudisc_lowat) { 1136 /* 1137 * XXX nuke a victim, install the new one. 1138 */ 1139 } 1140 } else { 1141 if (0 <= icmp6_mtudisc_lowat && rtcount > icmp6_mtudisc_lowat) 1142 return; 1143 } 1144 1145 memset(&sin6, 0, sizeof(sin6)); 1146 sin6.sin6_family = PF_INET6; 1147 sin6.sin6_len = sizeof(struct sockaddr_in6); 1148 sin6.sin6_addr = *dst; 1149 rcvif = m_get_rcvif(m, &s); 1150 if (in6_setscope(&sin6.sin6_addr, rcvif, NULL)) { 1151 m_put_rcvif(rcvif, &s); 1152 return; 1153 } 1154 m_put_rcvif(rcvif, &s); 1155 1156 rt = icmp6_mtudisc_clone(sin6tosa(&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 ICMP6_STATINC(ICMP6_STAT_PMTUCHG); 1163 rt->rt_rmx.rmx_mtu = mtu; 1164 } 1165 } 1166 if (rt) { 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 */ 1190static struct mbuf * 1191ni6_input(struct mbuf *m, int off) 1192{ 1193 struct icmp6_nodeinfo *ni6, *nni6; 1194 struct mbuf *n = NULL; 1195 u_int16_t qtype; 1196 int subjlen; 1197 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1198 struct ni_reply_fqdn *fqdn; 1199 int addrs; /* for NI_QTYPE_NODEADDR */ 1200 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */ 1201 struct sockaddr_in6 sin6; /* ip6_dst */ 1202 struct in6_addr in6_subj; /* subject address */ 1203 struct ip6_hdr *ip6; 1204 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */ 1205 char *subj = NULL; 1206 struct ifnet *rcvif; 1207 int s, ss; 1208 struct ifaddr *ifa; 1209 struct psref psref; 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 sockaddr_in6_init(&sin6, &ip6->ip6_dst, 0, 0, 0); 1227 /* XXX scopeid */ 1228 ss = pserialize_read_enter(); 1229 ifa = ifa_ifwithaddr(sin6tosa(&sin6)); 1230 if (ifa != NULL) 1231 ; /* unicast/anycast, fine */ 1232 else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr)) 1233 ; /* link-local multicast, fine */ 1234 else { 1235 pserialize_read_exit(ss); 1236 goto bad; 1237 } 1238 pserialize_read_exit(ss); 1239 1240 /* validate query Subject field. */ 1241 qtype = ntohs(ni6->ni_qtype); 1242 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo); 1243 switch (qtype) { 1244 case NI_QTYPE_NOOP: 1245 case NI_QTYPE_SUPTYPES: 1246 /* 07 draft */ 1247 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0) 1248 break; 1249 /* FALLTHROUGH */ 1250 case NI_QTYPE_FQDN: 1251 case NI_QTYPE_NODEADDR: 1252 case NI_QTYPE_IPV4ADDR: 1253 switch (ni6->ni_code) { 1254 case ICMP6_NI_SUBJ_IPV6: 1255#if ICMP6_NI_SUBJ_IPV6 != 0 1256 case 0: 1257#endif 1258 /* 1259 * backward compatibility - try to accept 03 draft 1260 * format, where no Subject is present. 1261 */ 1262 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 && 1263 subjlen == 0) { 1264 oldfqdn++; 1265 break; 1266 } 1267#if ICMP6_NI_SUBJ_IPV6 != 0 1268 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6) 1269 goto bad; 1270#endif 1271 1272 if (subjlen != sizeof(sin6.sin6_addr)) 1273 goto bad; 1274 1275 /* 1276 * Validate Subject address. 1277 * 1278 * Not sure what exactly "address belongs to the node" 1279 * means in the spec, is it just unicast, or what? 1280 * 1281 * At this moment we consider Subject address as 1282 * "belong to the node" if the Subject address equals 1283 * to the IPv6 destination address; validation for 1284 * IPv6 destination address should have done enough 1285 * check for us. 1286 * 1287 * We do not do proxy at this moment. 1288 */ 1289 /* m_pulldown instead of copy? */ 1290 m_copydata(m, off + sizeof(struct icmp6_nodeinfo), 1291 subjlen, (void *)&in6_subj); 1292 rcvif = m_get_rcvif(m, &s); 1293 if (in6_setscope(&in6_subj, rcvif, NULL)) { 1294 m_put_rcvif(rcvif, &s); 1295 goto bad; 1296 } 1297 m_put_rcvif(rcvif, &s); 1298 1299 subj = (char *)&in6_subj; 1300 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &in6_subj)) 1301 break; 1302 1303 /* 1304 * XXX if we are to allow other cases, we should really 1305 * be careful about scope here. 1306 * basically, we should disallow queries toward IPv6 1307 * destination X with subject Y, if scope(X) > scope(Y). 1308 * if we allow scope(X) > scope(Y), it will result in 1309 * information leakage across scope boundary. 1310 */ 1311 goto bad; 1312 1313 case ICMP6_NI_SUBJ_FQDN: 1314 /* 1315 * Validate Subject name with gethostname(3). 1316 * 1317 * The behavior may need some debate, since: 1318 * - we are not sure if the node has FQDN as 1319 * hostname (returned by gethostname(3)). 1320 * - the code does wildcard match for truncated names. 1321 * however, we are not sure if we want to perform 1322 * wildcard match, if gethostname(3) side has 1323 * truncated hostname. 1324 */ 1325 n = ni6_nametodns(hostname, hostnamelen, 0); 1326 if (!n || n->m_next || n->m_len == 0) 1327 goto bad; 1328 IP6_EXTHDR_GET(subj, char *, m, 1329 off + sizeof(struct icmp6_nodeinfo), subjlen); 1330 if (subj == NULL) 1331 goto bad; 1332 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *), 1333 n->m_len)) { 1334 goto bad; 1335 } 1336 m_freem(n); 1337 n = NULL; 1338 break; 1339 1340 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */ 1341 default: 1342 goto bad; 1343 } 1344 break; 1345 } 1346 1347 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */ 1348 switch (qtype) { 1349 case NI_QTYPE_FQDN: 1350 if ((icmp6_nodeinfo & 1) == 0) 1351 goto bad; 1352 break; 1353 case NI_QTYPE_NODEADDR: 1354 case NI_QTYPE_IPV4ADDR: 1355 if ((icmp6_nodeinfo & 2) == 0) 1356 goto bad; 1357 break; 1358 } 1359 1360 /* guess reply length */ 1361 switch (qtype) { 1362 case NI_QTYPE_NOOP: 1363 break; /* no reply data */ 1364 case NI_QTYPE_SUPTYPES: 1365 replylen += sizeof(u_int32_t); 1366 break; 1367 case NI_QTYPE_FQDN: 1368 /* XXX will append an mbuf */ 1369 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1370 break; 1371 case NI_QTYPE_NODEADDR: 1372 addrs = ni6_addrs(ni6, m, &ifp, subj, &psref); 1373 if ((replylen += addrs * (sizeof(struct in6_addr) + 1374 sizeof(u_int32_t))) > MCLBYTES) 1375 replylen = MCLBYTES; /* XXX: will truncate pkt later */ 1376 break; 1377 case NI_QTYPE_IPV4ADDR: 1378 /* unsupported - should respond with unknown Qtype? */ 1379 goto bad; 1380 default: 1381 /* 1382 * XXX: We must return a reply with the ICMP6 code 1383 * `unknown Qtype' in this case. However we regard the case 1384 * as an FQDN query for backward compatibility. 1385 * Older versions set a random value to this field, 1386 * so it rarely varies in the defined qtypes. 1387 * But the mechanism is not reliable... 1388 * maybe we should obsolete older versions. 1389 */ 1390 qtype = NI_QTYPE_FQDN; 1391 /* XXX will append an mbuf */ 1392 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1393 oldfqdn++; 1394 break; 1395 } 1396 1397 /* allocate an mbuf to reply. */ 1398 MGETHDR(n, M_DONTWAIT, m->m_type); 1399 if (n == NULL) { 1400 if_put(ifp, &psref); 1401 m_freem(m); 1402 return (NULL); 1403 } 1404 M_MOVE_PKTHDR(n, m); /* just for rcvif */ 1405 if (replylen > MHLEN) { 1406 if (replylen > MCLBYTES) { 1407 /* 1408 * XXX: should we try to allocate more? But MCLBYTES 1409 * is probably much larger than IPV6_MMTU... 1410 */ 1411 goto bad; 1412 } 1413 MCLGET(n, M_DONTWAIT); 1414 if ((n->m_flags & M_EXT) == 0) { 1415 goto bad; 1416 } 1417 } 1418 n->m_pkthdr.len = n->m_len = replylen; 1419 1420 /* copy mbuf header and IPv6 + Node Information base headers */ 1421 bcopy(mtod(m, void *), mtod(n, void *), sizeof(struct ip6_hdr)); 1422 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1); 1423 bcopy((void *)ni6, (void *)nni6, sizeof(struct icmp6_nodeinfo)); 1424 1425 /* qtype dependent procedure */ 1426 switch (qtype) { 1427 case NI_QTYPE_NOOP: 1428 nni6->ni_code = ICMP6_NI_SUCCESS; 1429 nni6->ni_flags = 0; 1430 break; 1431 case NI_QTYPE_SUPTYPES: 1432 { 1433 u_int32_t v; 1434 nni6->ni_code = ICMP6_NI_SUCCESS; 1435 nni6->ni_flags = htons(0x0000); /* raw bitmap */ 1436 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */ 1437 v = (u_int32_t)htonl(0x0000000f); 1438 bcopy(&v, nni6 + 1, sizeof(u_int32_t)); 1439 break; 1440 } 1441 case NI_QTYPE_FQDN: 1442 nni6->ni_code = ICMP6_NI_SUCCESS; 1443 fqdn = (struct ni_reply_fqdn *)(mtod(n, char *) + 1444 sizeof(struct ip6_hdr) + 1445 sizeof(struct icmp6_nodeinfo)); 1446 nni6->ni_flags = 0; /* XXX: meaningless TTL */ 1447 fqdn->ni_fqdn_ttl = 0; /* ditto. */ 1448 /* 1449 * XXX do we really have FQDN in variable "hostname"? 1450 */ 1451 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn); 1452 if (n->m_next == NULL) 1453 goto bad; 1454 /* XXX we assume that n->m_next is not a chain */ 1455 if (n->m_next->m_next != NULL) 1456 goto bad; 1457 n->m_pkthdr.len += n->m_next->m_len; 1458 break; 1459 case NI_QTYPE_NODEADDR: 1460 { 1461 int lenlim, copied; 1462 1463 nni6->ni_code = ICMP6_NI_SUCCESS; 1464 n->m_pkthdr.len = n->m_len = 1465 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1466 lenlim = M_TRAILINGSPACE(n); 1467 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim); 1468 if_put(ifp, &psref); 1469 ifp = NULL; 1470 /* XXX: reset mbuf length */ 1471 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 1472 sizeof(struct icmp6_nodeinfo) + copied; 1473 break; 1474 } 1475 default: 1476 break; /* XXX impossible! */ 1477 } 1478 1479 nni6->ni_type = ICMP6_NI_REPLY; 1480 m_freem(m); 1481 return (n); 1482 1483 bad: 1484 if_put(ifp, &psref); 1485 m_freem(m); 1486 if (n) 1487 m_freem(n); 1488 return (NULL); 1489} 1490#undef hostnamelen 1491 1492#define isupper(x) ('A' <= (x) && (x) <= 'Z') 1493#define isalpha(x) (('A' <= (x) && (x) <= 'Z') || ('a' <= (x) && (x) <= 'z')) 1494#define isalnum(x) (isalpha(x) || ('0' <= (x) && (x) <= '9')) 1495#define tolower(x) (isupper(x) ? (x) + 'a' - 'A' : (x)) 1496 1497/* 1498 * make a mbuf with DNS-encoded string. no compression support. 1499 * 1500 * XXX names with less than 2 dots (like "foo" or "foo.section") will be 1501 * treated as truncated name (two \0 at the end). this is a wild guess. 1502 * 1503 * old - return pascal string if non-zero 1504 */ 1505static struct mbuf * 1506ni6_nametodns(const char *name, int namelen, int old) 1507{ 1508 struct mbuf *m; 1509 char *cp, *ep; 1510 const char *p, *q; 1511 int i, len, nterm; 1512 1513 if (old) 1514 len = namelen + 1; 1515 else 1516 len = MCLBYTES; 1517 1518 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */ 1519 MGET(m, M_DONTWAIT, MT_DATA); 1520 if (m && len > MLEN) { 1521 MCLGET(m, M_DONTWAIT); 1522 if ((m->m_flags & M_EXT) == 0) 1523 goto fail; 1524 } 1525 if (!m) 1526 goto fail; 1527 m->m_next = NULL; 1528 1529 if (old) { 1530 m->m_len = len; 1531 *mtod(m, char *) = namelen; 1532 bcopy(name, mtod(m, char *) + 1, namelen); 1533 return m; 1534 } else { 1535 m->m_len = 0; 1536 cp = mtod(m, char *); 1537 ep = mtod(m, char *) + M_TRAILINGSPACE(m); 1538 1539 /* if not certain about my name, return empty buffer */ 1540 if (namelen == 0) 1541 return m; 1542 1543 /* 1544 * guess if it looks like shortened hostname, or FQDN. 1545 * shortened hostname needs two trailing "\0". 1546 */ 1547 i = 0; 1548 for (p = name; p < name + namelen; p++) { 1549 if (*p == '.') 1550 i++; 1551 } 1552 if (i < 2) 1553 nterm = 2; 1554 else 1555 nterm = 1; 1556 1557 p = name; 1558 while (cp < ep && p < name + namelen) { 1559 i = 0; 1560 for (q = p; q < name + namelen && *q && *q != '.'; q++) 1561 i++; 1562 /* result does not fit into mbuf */ 1563 if (cp + i + 1 >= ep) 1564 goto fail; 1565 /* 1566 * DNS label length restriction, RFC1035 page 8. 1567 * "i == 0" case is included here to avoid returning 1568 * 0-length label on "foo..bar". 1569 */ 1570 if (i <= 0 || i >= 64) 1571 goto fail; 1572 *cp++ = i; 1573 if (!isalpha(p[0]) || !isalnum(p[i - 1])) 1574 goto fail; 1575 while (i > 0) { 1576 if (!isalnum(*p) && *p != '-') 1577 goto fail; 1578 if (isupper(*p)) { 1579 *cp++ = tolower(*p); 1580 p++; 1581 } else 1582 *cp++ = *p++; 1583 i--; 1584 } 1585 p = q; 1586 if (p < name + namelen && *p == '.') 1587 p++; 1588 } 1589 /* termination */ 1590 if (cp + nterm >= ep) 1591 goto fail; 1592 while (nterm-- > 0) 1593 *cp++ = '\0'; 1594 m->m_len = cp - mtod(m, char *); 1595 return m; 1596 } 1597 1598 panic("should not reach here"); 1599 /* NOTREACHED */ 1600 1601 fail: 1602 if (m) 1603 m_freem(m); 1604 return NULL; 1605} 1606 1607/* 1608 * check if two DNS-encoded string matches. takes care of truncated 1609 * form (with \0\0 at the end). no compression support. 1610 * XXX upper/lowercase match (see RFC2065) 1611 */ 1612static int 1613ni6_dnsmatch(const char *a, int alen, const char *b, int blen) 1614{ 1615 const char *a0, *b0; 1616 int l; 1617 1618 /* simplest case - need validation? */ 1619 if (alen == blen && memcmp(a, b, alen) == 0) 1620 return 1; 1621 1622 a0 = a; 1623 b0 = b; 1624 1625 /* termination is mandatory */ 1626 if (alen < 2 || blen < 2) 1627 return 0; 1628 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0') 1629 return 0; 1630 alen--; 1631 blen--; 1632 1633 while (a - a0 < alen && b - b0 < blen) { 1634 if (a - a0 + 1 > alen || b - b0 + 1 > blen) 1635 return 0; 1636 1637 if ((signed char)a[0] < 0 || (signed char)b[0] < 0) 1638 return 0; 1639 /* we don't support compression yet */ 1640 if (a[0] >= 64 || b[0] >= 64) 1641 return 0; 1642 1643 /* truncated case */ 1644 if (a[0] == 0 && a - a0 == alen - 1) 1645 return 1; 1646 if (b[0] == 0 && b - b0 == blen - 1) 1647 return 1; 1648 if (a[0] == 0 || b[0] == 0) 1649 return 0; 1650 1651 if (a[0] != b[0]) 1652 return 0; 1653 l = a[0]; 1654 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen) 1655 return 0; 1656 if (memcmp(a + 1, b + 1, l) != 0) 1657 return 0; 1658 1659 a += 1 + l; 1660 b += 1 + l; 1661 } 1662 1663 if (a - a0 == alen && b - b0 == blen) 1664 return 1; 1665 else 1666 return 0; 1667} 1668 1669/* 1670 * calculate the number of addresses to be returned in the node info reply. 1671 */ 1672static int 1673ni6_addrs(struct icmp6_nodeinfo *ni6, struct mbuf *m, 1674 struct ifnet **ifpp, char *subj, struct psref *psref) 1675{ 1676 struct ifnet *ifp; 1677 struct in6_ifaddr *ia6; 1678 struct ifaddr *ifa; 1679 struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */ 1680 int addrs = 0, addrsofif, iffound = 0; 1681 int niflags = ni6->ni_flags; 1682 int s; 1683 1684 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) { 1685 switch (ni6->ni_code) { 1686 case ICMP6_NI_SUBJ_IPV6: 1687 if (subj == NULL) /* must be impossible... */ 1688 return (0); 1689 subj_ip6 = (struct sockaddr_in6 *)subj; 1690 break; 1691 default: 1692 /* 1693 * XXX: we only support IPv6 subject address for 1694 * this Qtype. 1695 */ 1696 return (0); 1697 } 1698 } 1699 1700 s = pserialize_read_enter(); 1701 IFNET_READER_FOREACH(ifp) { 1702 addrsofif = 0; 1703 IFADDR_READER_FOREACH(ifa, ifp) { 1704 if (ifa->ifa_addr->sa_family != AF_INET6) 1705 continue; 1706 ia6 = (struct in6_ifaddr *)ifa; 1707 1708 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 && 1709 IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr, 1710 &ia6->ia_addr.sin6_addr)) 1711 iffound = 1; 1712 1713 /* 1714 * IPv4-mapped addresses can only be returned by a 1715 * Node Information proxy, since they represent 1716 * addresses of IPv4-only nodes, which perforce do 1717 * not implement this protocol. 1718 * [icmp-name-lookups-07, Section 5.4] 1719 * So we don't support NI_NODEADDR_FLAG_COMPAT in 1720 * this function at this moment. 1721 */ 1722 1723 /* What do we have to do about ::1? */ 1724 switch (in6_addrscope(&ia6->ia_addr.sin6_addr)) { 1725 case IPV6_ADDR_SCOPE_LINKLOCAL: 1726 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1727 continue; 1728 break; 1729 case IPV6_ADDR_SCOPE_SITELOCAL: 1730 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1731 continue; 1732 break; 1733 case IPV6_ADDR_SCOPE_GLOBAL: 1734 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1735 continue; 1736 break; 1737 default: 1738 continue; 1739 } 1740 1741 /* 1742 * check if anycast is okay. 1743 * XXX: just experimental. not in the spec. 1744 */ 1745 if ((ia6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1746 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 1747 continue; /* we need only unicast addresses */ 1748 1749 addrsofif++; /* count the address */ 1750 } 1751 if (iffound) { 1752 if_acquire_NOMPSAFE(ifp, psref); 1753 pserialize_read_exit(s); 1754 *ifpp = ifp; 1755 return (addrsofif); 1756 } 1757 1758 addrs += addrsofif; 1759 } 1760 pserialize_read_exit(s); 1761 1762 return (addrs); 1763} 1764 1765static int 1766ni6_store_addrs(struct icmp6_nodeinfo *ni6, 1767 struct icmp6_nodeinfo *nni6, struct ifnet *ifp0, 1768 int resid) 1769{ 1770 struct ifnet *ifp; 1771 struct in6_ifaddr *ia6; 1772 struct ifaddr *ifa; 1773 struct ifnet *ifp_dep = NULL; 1774 int copied = 0, allow_deprecated = 0; 1775 u_char *cp = (u_char *)(nni6 + 1); 1776 int niflags = ni6->ni_flags; 1777 u_int32_t ltime; 1778 int s; 1779 1780 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL)) 1781 return (0); /* needless to copy */ 1782 1783 s = pserialize_read_enter(); 1784 ifp = ifp0 ? ifp0 : IFNET_READER_FIRST(); 1785 again: 1786 1787 for (; ifp; ifp = IFNET_READER_NEXT(ifp)) 1788 { 1789 IFADDR_READER_FOREACH(ifa, ifp) { 1790 if (ifa->ifa_addr->sa_family != AF_INET6) 1791 continue; 1792 ia6 = (struct in6_ifaddr *)ifa; 1793 1794 if ((ia6->ia6_flags & IN6_IFF_DEPRECATED) != 0 && 1795 allow_deprecated == 0) { 1796 /* 1797 * prefererred address should be put before 1798 * deprecated addresses. 1799 */ 1800 1801 /* record the interface for later search */ 1802 if (ifp_dep == NULL) 1803 ifp_dep = ifp; 1804 1805 continue; 1806 } 1807 else if ((ia6->ia6_flags & IN6_IFF_DEPRECATED) == 0 && 1808 allow_deprecated != 0) 1809 continue; /* we now collect deprecated addrs */ 1810 1811 /* What do we have to do about ::1? */ 1812 switch (in6_addrscope(&ia6->ia_addr.sin6_addr)) { 1813 case IPV6_ADDR_SCOPE_LINKLOCAL: 1814 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1815 continue; 1816 break; 1817 case IPV6_ADDR_SCOPE_SITELOCAL: 1818 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1819 continue; 1820 break; 1821 case IPV6_ADDR_SCOPE_GLOBAL: 1822 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1823 continue; 1824 break; 1825 default: 1826 continue; 1827 } 1828 1829 /* 1830 * check if anycast is okay. 1831 * XXX: just experimental. not in the spec. 1832 */ 1833 if ((ia6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1834 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 1835 continue; 1836 1837 /* now we can copy the address */ 1838 if (resid < sizeof(struct in6_addr) + 1839 sizeof(u_int32_t)) { 1840 /* 1841 * We give up much more copy. 1842 * Set the truncate flag and return. 1843 */ 1844 nni6->ni_flags |= NI_NODEADDR_FLAG_TRUNCATE; 1845 goto out; 1846 } 1847 1848 /* 1849 * Set the TTL of the address. 1850 * The TTL value should be one of the following 1851 * according to the specification: 1852 * 1853 * 1. The remaining lifetime of a DHCP lease on the 1854 * address, or 1855 * 2. The remaining Valid Lifetime of a prefix from 1856 * which the address was derived through Stateless 1857 * Autoconfiguration. 1858 * 1859 * Note that we currently do not support stateful 1860 * address configuration by DHCPv6, so the former 1861 * case can't happen. 1862 * 1863 * TTL must be 2^31 > TTL >= 0. 1864 */ 1865 if (ia6->ia6_lifetime.ia6t_expire == 0) 1866 ltime = ND6_INFINITE_LIFETIME; 1867 else { 1868 if (ia6->ia6_lifetime.ia6t_expire > 1869 time_uptime) 1870 ltime = ia6->ia6_lifetime.ia6t_expire - 1871 time_uptime; 1872 else 1873 ltime = 0; 1874 } 1875 if (ltime > 0x7fffffff) 1876 ltime = 0x7fffffff; 1877 ltime = htonl(ltime); 1878 1879 bcopy(<ime, cp, sizeof(u_int32_t)); 1880 cp += sizeof(u_int32_t); 1881 1882 /* copy the address itself */ 1883 bcopy(&ia6->ia_addr.sin6_addr, cp, 1884 sizeof(struct in6_addr)); 1885 in6_clearscope((struct in6_addr *)cp); /* XXX */ 1886 cp += sizeof(struct in6_addr); 1887 1888 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1889 copied += (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1890 } 1891 if (ifp0) /* we need search only on the specified IF */ 1892 break; 1893 } 1894 1895 if (allow_deprecated == 0 && ifp_dep != NULL) { 1896 ifp = ifp_dep; 1897 allow_deprecated = 1; 1898 1899 goto again; 1900 } 1901out: 1902 pserialize_read_exit(s); 1903 return (copied); 1904} 1905 1906/* 1907 * XXX almost dup'ed code with rip6_input. 1908 */ 1909static int 1910icmp6_rip6_input(struct mbuf **mp, 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 /* 1928 * XXX: the address may have embedded scope zone ID, which should be 1929 * hidden from applications. 1930 */ 1931 sockaddr_in6_init(&rip6src, &ip6->ip6_src, 0, 0, 0); 1932 if (sa6_recoverscope(&rip6src)) { 1933 m_freem(m); 1934 return (IPPROTO_DONE); 1935 } 1936 1937 TAILQ_FOREACH(inph, &raw6cbtable.inpt_queue, inph_queue) { 1938 in6p = (struct in6pcb *)inph; 1939 if (in6p->in6p_af != AF_INET6) 1940 continue; 1941 if (in6p->in6p_ip6.ip6_nxt != IPPROTO_ICMPV6) 1942 continue; 1943 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && 1944 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst)) 1945 continue; 1946 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) && 1947 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src)) 1948 continue; 1949 if (in6p->in6p_icmp6filt 1950 && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type, 1951 in6p->in6p_icmp6filt)) 1952 continue; 1953 if (last) { 1954 struct mbuf *n; 1955 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { 1956 if (last->in6p_flags & IN6P_CONTROLOPTS) 1957 ip6_savecontrol(last, &opts, ip6, n); 1958 /* strip intermediate headers */ 1959 m_adj(n, off); 1960 if (sbappendaddr(&last->in6p_socket->so_rcv, 1961 sin6tosa(&rip6src), n, opts) == 0) { 1962 /* should notify about lost packet */ 1963 m_freem(n); 1964 if (opts) 1965 m_freem(opts); 1966 } else 1967 sorwakeup(last->in6p_socket); 1968 opts = NULL; 1969 } 1970 } 1971 last = in6p; 1972 } 1973 if (last) { 1974 if (last->in6p_flags & IN6P_CONTROLOPTS) 1975 ip6_savecontrol(last, &opts, ip6, m); 1976 /* strip intermediate headers */ 1977 m_adj(m, off); 1978 if (sbappendaddr(&last->in6p_socket->so_rcv, 1979 sin6tosa(&rip6src), m, opts) == 0) { 1980 m_freem(m); 1981 if (opts) 1982 m_freem(opts); 1983 } else 1984 sorwakeup(last->in6p_socket); 1985 } else { 1986 m_freem(m); 1987 IP6_STATDEC(IP6_STAT_DELIVERED); 1988 } 1989 return IPPROTO_DONE; 1990} 1991 1992/* 1993 * Reflect the ip6 packet back to the source. 1994 * OFF points to the icmp6 header, counted from the top of the mbuf. 1995 * 1996 * Note: RFC 1885 required that an echo reply should be truncated if it 1997 * did not fit in with (return) path MTU, and KAME code supported the 1998 * behavior. However, as a clarification after the RFC, this limitation 1999 * was removed in a revised version of the spec, RFC 2463. We had kept the 2000 * old behavior, with a (non-default) ifdef block, while the new version of 2001 * the spec was an internet-draft status, and even after the new RFC was 2002 * published. But it would rather make sense to clean the obsoleted part 2003 * up, and to make the code simpler at this stage. 2004 */ 2005void 2006icmp6_reflect(struct mbuf *m, size_t off) 2007{ 2008 struct ip6_hdr *ip6; 2009 struct icmp6_hdr *icmp6; 2010 const struct in6_ifaddr *ia; 2011 const struct ip6aux *ip6a; 2012 int plen; 2013 int type, code; 2014 struct ifnet *outif = NULL; 2015 struct in6_addr origdst; 2016 struct ifnet *rcvif; 2017 int s; 2018 bool ip6_src_filled = false; 2019 2020 /* too short to reflect */ 2021 if (off < sizeof(struct ip6_hdr)) { 2022 nd6log(LOG_DEBUG, 2023 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n", 2024 (u_long)off, (u_long)sizeof(struct ip6_hdr), 2025 __FILE__, __LINE__); 2026 goto bad; 2027 } 2028 2029 /* 2030 * If there are extra headers between IPv6 and ICMPv6, strip 2031 * off that header first. 2032 */ 2033#ifdef DIAGNOSTIC 2034 if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN) 2035 panic("assumption failed in icmp6_reflect"); 2036#endif 2037 if (off > sizeof(struct ip6_hdr)) { 2038 size_t l; 2039 struct ip6_hdr nip6; 2040 2041 l = off - sizeof(struct ip6_hdr); 2042 m_copydata(m, 0, sizeof(nip6), (void *)&nip6); 2043 m_adj(m, l); 2044 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2045 if (m->m_len < l) { 2046 if ((m = m_pullup(m, l)) == NULL) 2047 return; 2048 } 2049 bcopy((void *)&nip6, mtod(m, void *), sizeof(nip6)); 2050 } else /* off == sizeof(struct ip6_hdr) */ { 2051 size_t l; 2052 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2053 if (m->m_len < l) { 2054 if ((m = m_pullup(m, l)) == NULL) 2055 return; 2056 } 2057 } 2058 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr); 2059 ip6 = mtod(m, struct ip6_hdr *); 2060 ip6->ip6_nxt = IPPROTO_ICMPV6; 2061 icmp6 = (struct icmp6_hdr *)(ip6 + 1); 2062 type = icmp6->icmp6_type; /* keep type for statistics */ 2063 code = icmp6->icmp6_code; /* ditto. */ 2064 2065 origdst = ip6->ip6_dst; 2066 /* 2067 * ip6_input() drops a packet if its src is multicast. 2068 * So, the src is never multicast. 2069 */ 2070 ip6->ip6_dst = ip6->ip6_src; 2071 2072 /* 2073 * If the incoming packet was addressed directly to us (i.e. unicast), 2074 * use dst as the src for the reply. 2075 * The IN6_IFF_NOTREADY case should be VERY rare, but is possible 2076 * (for example) when we encounter an error while forwarding procedure 2077 * destined to a duplicated address of ours. 2078 * Note that ip6_getdstifaddr() may fail if we are in an error handling 2079 * procedure of an outgoing packet of our own, in which case we need 2080 * to search in the ifaddr list. 2081 */ 2082 if (IN6_IS_ADDR_MULTICAST(&origdst)) 2083 ; 2084 else if ((ip6a = ip6_getdstifaddr(m)) != NULL) { 2085 if ((ip6a->ip6a_flags & 2086 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) { 2087 ip6->ip6_src = ip6a->ip6a_src; 2088 ip6_src_filled = true; 2089 } 2090 } else { 2091 union { 2092 struct sockaddr_in6 sin6; 2093 struct sockaddr sa; 2094 } u; 2095 int _s; 2096 struct ifaddr *ifa; 2097 2098 sockaddr_in6_init(&u.sin6, &origdst, 0, 0, 0); 2099 2100 _s = pserialize_read_enter(); 2101 ifa = ifa_ifwithaddr(&u.sa); 2102 2103 if (ifa != NULL) { 2104 ia = ifatoia6(ifa); 2105 if ((ia->ia6_flags & 2106 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) { 2107 ip6->ip6_src = ia->ia_addr.sin6_addr; 2108 ip6_src_filled = true; 2109 } 2110 } 2111 pserialize_read_exit(_s); 2112 } 2113 2114 if (!ip6_src_filled) { 2115 int e; 2116 struct sockaddr_in6 sin6; 2117 struct route ro; 2118 2119 /* 2120 * This case matches to multicasts, our anycast, or unicasts 2121 * that we do not own. Select a source address based on the 2122 * source address of the erroneous packet. 2123 */ 2124 /* zone ID should be embedded */ 2125 sockaddr_in6_init(&sin6, &ip6->ip6_dst, 0, 0, 0); 2126 2127 memset(&ro, 0, sizeof(ro)); 2128 e = in6_selectsrc(&sin6, NULL, NULL, &ro, NULL, NULL, NULL, 2129 &ip6->ip6_src); 2130 rtcache_free(&ro); 2131 if (e != 0) { 2132 nd6log(LOG_DEBUG, 2133 "source can't be determined: " 2134 "dst=%s, error=%d\n", 2135 ip6_sprintf(&sin6.sin6_addr), e); 2136 goto bad; 2137 } 2138 } 2139 2140 ip6->ip6_flow = 0; 2141 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2142 ip6->ip6_vfc |= IPV6_VERSION; 2143 ip6->ip6_nxt = IPPROTO_ICMPV6; 2144 rcvif = m_get_rcvif(m, &s); 2145 if (rcvif) { 2146 /* XXX: This may not be the outgoing interface */ 2147 ip6->ip6_hlim = ND_IFINFO(rcvif)->chlim; 2148 } else 2149 ip6->ip6_hlim = ip6_defhlim; 2150 m_put_rcvif(rcvif, &s); 2151 2152 m->m_pkthdr.csum_flags = 0; 2153 icmp6->icmp6_cksum = 0; 2154 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6, 2155 sizeof(struct ip6_hdr), plen); 2156 2157 /* 2158 * XXX option handling 2159 */ 2160 2161 m->m_flags &= ~(M_BCAST|M_MCAST); 2162 2163 /* 2164 * To avoid a "too big" situation at an intermediate router 2165 * and the path MTU discovery process, specify the IPV6_MINMTU flag. 2166 * Note that only echo and node information replies are affected, 2167 * since the length of ICMP6 errors is limited to the minimum MTU. 2168 */ 2169 if (ip6_output(m, NULL, NULL, IPV6_MINMTU, NULL, NULL, &outif) 2170 != 0 && outif) 2171 icmp6_ifstat_inc(outif, ifs6_out_error); 2172 if (outif) 2173 icmp6_ifoutstat_inc(outif, type, code); 2174 2175 return; 2176 2177 bad: 2178 m_freem(m); 2179 return; 2180} 2181 2182static const char * 2183icmp6_redirect_diag(struct in6_addr *src6, struct in6_addr *dst6, 2184 struct in6_addr *tgt6) 2185{ 2186 static char buf[1024]; 2187 snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)", 2188 ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6)); 2189 return buf; 2190} 2191 2192void 2193icmp6_redirect_input(struct mbuf *m, int off) 2194{ 2195 struct ifnet *ifp; 2196 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 2197 struct nd_redirect *nd_rd; 2198 int icmp6len = ntohs(ip6->ip6_plen); 2199 char *lladdr = NULL; 2200 int lladdrlen = 0; 2201 struct rtentry *rt = NULL; 2202 int is_router; 2203 int is_onlink; 2204 struct in6_addr src6 = ip6->ip6_src; 2205 struct in6_addr redtgt6; 2206 struct in6_addr reddst6; 2207 union nd_opts ndopts; 2208 struct psref psref; 2209 2210 ifp = m_get_rcvif_psref(m, &psref); 2211 if (ifp == NULL) 2212 goto freeit; 2213 2214 /* XXX if we are router, we don't update route by icmp6 redirect */ 2215 if (ip6_forwarding) 2216 goto freeit; 2217 if (!icmp6_rediraccept) 2218 goto freeit; 2219 2220 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len); 2221 if (nd_rd == NULL) { 2222 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 2223 m_put_rcvif_psref(ifp, &psref); 2224 return; 2225 } 2226 redtgt6 = nd_rd->nd_rd_target; 2227 reddst6 = nd_rd->nd_rd_dst; 2228 2229 if (in6_setscope(&redtgt6, ifp, NULL) || 2230 in6_setscope(&reddst6, ifp, NULL)) { 2231 goto freeit; 2232 } 2233 2234 /* validation */ 2235 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) { 2236 nd6log(LOG_ERR, 2237 "ICMP6 redirect sent from %s rejected; " 2238 "must be from linklocal\n", ip6_sprintf(&src6)); 2239 goto bad; 2240 } 2241 if (ip6->ip6_hlim != 255) { 2242 nd6log(LOG_ERR, 2243 "ICMP6 redirect sent from %s rejected; " 2244 "hlim=%d (must be 255)\n", 2245 ip6_sprintf(&src6), ip6->ip6_hlim); 2246 goto bad; 2247 } 2248 { 2249 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */ 2250 struct sockaddr_in6 sin6; 2251 struct in6_addr *gw6; 2252 2253 sockaddr_in6_init(&sin6, &reddst6, 0, 0, 0); 2254 rt = rtalloc1(sin6tosa(&sin6), 0); 2255 if (rt) { 2256 if (rt->rt_gateway == NULL || 2257 rt->rt_gateway->sa_family != AF_INET6) { 2258 nd6log(LOG_ERR, 2259 "ICMP6 redirect rejected; no route " 2260 "with inet6 gateway found for redirect dst: %s\n", 2261 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); 2262 rtfree(rt); 2263 goto bad; 2264 } 2265 2266 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr); 2267 if (memcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) { 2268 nd6log(LOG_ERR, 2269 "ICMP6 redirect rejected; " 2270 "not equal to gw-for-src=%s (must be same): %s\n", 2271 ip6_sprintf(gw6), 2272 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); 2273 rtfree(rt); 2274 goto bad; 2275 } 2276 } else { 2277 nd6log(LOG_ERR, "ICMP6 redirect rejected; " 2278 "no route found for redirect dst: %s\n", 2279 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); 2280 goto bad; 2281 } 2282 rtfree(rt); 2283 rt = NULL; 2284 } 2285 if (IN6_IS_ADDR_MULTICAST(&reddst6)) { 2286 nd6log(LOG_ERR, "ICMP6 redirect rejected; " 2287 "redirect dst must be unicast: %s\n", 2288 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); 2289 goto bad; 2290 } 2291 2292 is_router = is_onlink = 0; 2293 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 2294 is_router = 1; /* router case */ 2295 if (memcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0) 2296 is_onlink = 1; /* on-link destination case */ 2297 if (!is_router && !is_onlink) { 2298 nd6log(LOG_ERR, "ICMP6 redirect rejected; " 2299 "neither router case nor onlink case: %s\n", 2300 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); 2301 goto bad; 2302 } 2303 /* validation passed */ 2304 2305 icmp6len -= sizeof(*nd_rd); 2306 nd6_option_init(nd_rd + 1, icmp6len, &ndopts); 2307 if (nd6_options(&ndopts) < 0) { 2308 nd6log(LOG_INFO, "invalid ND option, rejected: %s\n", 2309 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); 2310 /* nd6_options have incremented stats */ 2311 goto freeit; 2312 } 2313 2314 if (ndopts.nd_opts_tgt_lladdr) { 2315 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 2316 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 2317 } 2318 2319 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 2320 nd6log(LOG_INFO, "lladdrlen mismatch for %s " 2321 "(if %d, icmp6 packet %d): %s\n", 2322 ip6_sprintf(&redtgt6), ifp->if_addrlen, lladdrlen - 2, 2323 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); 2324 goto bad; 2325 } 2326 2327 /* RFC 2461 8.3 */ 2328 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT, 2329 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER); 2330 2331 m_put_rcvif_psref(ifp, &psref); 2332 ifp = NULL; 2333 2334 if (!is_onlink) { /* better router case. perform rtredirect. */ 2335 /* perform rtredirect */ 2336 struct sockaddr_in6 sdst; 2337 struct sockaddr_in6 sgw; 2338 struct sockaddr_in6 ssrc; 2339 unsigned long rtcount; 2340 struct rtentry *newrt = NULL; 2341 2342 /* 2343 * do not install redirect route, if the number of entries 2344 * is too much (> hiwat). note that, the node (= host) will 2345 * work just fine even if we do not install redirect route 2346 * (there will be additional hops, though). 2347 */ 2348 rtcount = rt_timer_count(icmp6_redirect_timeout_q); 2349 if (0 <= ip6_maxdynroutes && rtcount >= ip6_maxdynroutes) 2350 goto freeit; 2351 if (0 <= icmp6_redirect_hiwat && rtcount > icmp6_redirect_hiwat) 2352 goto freeit; 2353 else if (0 <= icmp6_redirect_lowat && 2354 rtcount > icmp6_redirect_lowat) { 2355 /* 2356 * XXX nuke a victim, install the new one. 2357 */ 2358 } 2359 2360 memset(&sdst, 0, sizeof(sdst)); 2361 memset(&sgw, 0, sizeof(sgw)); 2362 memset(&ssrc, 0, sizeof(ssrc)); 2363 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6; 2364 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len = 2365 sizeof(struct sockaddr_in6); 2366 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr)); 2367 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2368 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr)); 2369 rtredirect(sin6tosa(&sdst), sin6tosa(&sgw), NULL, 2370 RTF_GATEWAY | RTF_HOST, sin6tosa(&ssrc), 2371 &newrt); 2372 2373 if (newrt) { 2374 (void)rt_timer_add(newrt, icmp6_redirect_timeout, 2375 icmp6_redirect_timeout_q); 2376 rtfree(newrt); 2377 } 2378 } 2379 /* finally update cached route in each socket via pfctlinput */ 2380 { 2381 struct sockaddr_in6 sdst; 2382 2383 sockaddr_in6_init(&sdst, &reddst6, 0, 0, 0); 2384 pfctlinput(PRC_REDIRECT_HOST, sin6tosa(&sdst)); 2385#if defined(IPSEC) 2386 if (ipsec_used) 2387 key_sa_routechange(sin6tosa(&sdst)); 2388#endif 2389 } 2390 2391 freeit: 2392 if (ifp != NULL) 2393 m_put_rcvif_psref(ifp, &psref); 2394 m_freem(m); 2395 return; 2396 2397 bad: 2398 m_put_rcvif_psref(ifp, &psref); 2399 ICMP6_STATINC(ICMP6_STAT_BADREDIRECT); 2400 m_freem(m); 2401} 2402 2403void 2404icmp6_redirect_output(struct mbuf *m0, struct rtentry *rt) 2405{ 2406 struct ifnet *ifp; /* my outgoing interface */ 2407 struct in6_addr *ifp_ll6; 2408 struct in6_addr *nexthop; 2409 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */ 2410 struct mbuf *m = NULL; /* newly allocated one */ 2411 struct ip6_hdr *ip6; /* m as struct ip6_hdr */ 2412 struct nd_redirect *nd_rd; 2413 size_t maxlen; 2414 u_char *p; 2415 struct sockaddr_in6 src_sa; 2416 2417 icmp6_errcount(ICMP6_STAT_OUTERRHIST, ND_REDIRECT, 0); 2418 2419 /* if we are not router, we don't send icmp6 redirect */ 2420 if (!ip6_forwarding) 2421 goto fail; 2422 2423 /* sanity check */ 2424 KASSERT(m0 != NULL); 2425 KASSERT(rt != NULL); 2426 2427 ifp = rt->rt_ifp; 2428 2429 /* 2430 * Address check: 2431 * the source address must identify a neighbor, and 2432 * the destination address must not be a multicast address 2433 * [RFC 2461, sec 8.2] 2434 */ 2435 sip6 = mtod(m0, struct ip6_hdr *); 2436 sockaddr_in6_init(&src_sa, &sip6->ip6_src, 0, 0, 0); 2437 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0) 2438 goto fail; 2439 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst)) 2440 goto fail; /* what should we do here? */ 2441 2442 /* rate limit */ 2443 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0)) 2444 goto fail; 2445 2446 /* 2447 * Since we are going to append up to 1280 bytes (= IPV6_MMTU), 2448 * we almost always ask for an mbuf cluster for simplicity. 2449 * (MHLEN < IPV6_MMTU is almost always true) 2450 */ 2451 MGETHDR(m, M_DONTWAIT, MT_HEADER); 2452 if (m && IPV6_MMTU >= MHLEN) { 2453#if IPV6_MMTU >= MCLBYTES 2454 _MCLGET(m, mcl_cache, IPV6_MMTU, M_DONTWAIT); 2455#else 2456 MCLGET(m, M_DONTWAIT); 2457#endif 2458 } 2459 2460 if (!m) 2461 goto fail; 2462 m_reset_rcvif(m); 2463 m->m_len = 0; 2464 maxlen = M_TRAILINGSPACE(m); 2465 maxlen = min(IPV6_MMTU, maxlen); 2466 /* just for safety */ 2467 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) + 2468 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) { 2469 goto fail; 2470 } 2471 2472 { 2473 /* get ip6 linklocal address for ifp(my outgoing interface). */ 2474 struct in6_ifaddr *ia; 2475 int s = pserialize_read_enter(); 2476 if ((ia = in6ifa_ifpforlinklocal(ifp, 2477 IN6_IFF_NOTREADY| 2478 IN6_IFF_ANYCAST)) == NULL) { 2479 pserialize_read_exit(s); 2480 goto fail; 2481 } 2482 ifp_ll6 = &ia->ia_addr.sin6_addr; 2483 pserialize_read_exit(s); 2484 } 2485 2486 /* get ip6 linklocal address for the router. */ 2487 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) { 2488 struct sockaddr_in6 *sin6; 2489 sin6 = (struct sockaddr_in6 *)rt->rt_gateway; 2490 nexthop = &sin6->sin6_addr; 2491 if (!IN6_IS_ADDR_LINKLOCAL(nexthop)) 2492 nexthop = NULL; 2493 } else 2494 nexthop = NULL; 2495 2496 /* ip6 */ 2497 ip6 = mtod(m, struct ip6_hdr *); 2498 ip6->ip6_flow = 0; 2499 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2500 ip6->ip6_vfc |= IPV6_VERSION; 2501 /* ip6->ip6_plen will be set later */ 2502 ip6->ip6_nxt = IPPROTO_ICMPV6; 2503 ip6->ip6_hlim = 255; 2504 /* ip6->ip6_src must be linklocal addr for my outgoing if. */ 2505 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr)); 2506 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr)); 2507 2508 /* ND Redirect */ 2509 nd_rd = (struct nd_redirect *)(ip6 + 1); 2510 nd_rd->nd_rd_type = ND_REDIRECT; 2511 nd_rd->nd_rd_code = 0; 2512 nd_rd->nd_rd_reserved = 0; 2513 if (rt->rt_flags & RTF_GATEWAY) { 2514 /* 2515 * nd_rd->nd_rd_target must be a link-local address in 2516 * better router cases. 2517 */ 2518 if (!nexthop) 2519 goto fail; 2520 bcopy(nexthop, &nd_rd->nd_rd_target, 2521 sizeof(nd_rd->nd_rd_target)); 2522 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2523 sizeof(nd_rd->nd_rd_dst)); 2524 } else { 2525 /* make sure redtgt == reddst */ 2526 nexthop = &sip6->ip6_dst; 2527 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target, 2528 sizeof(nd_rd->nd_rd_target)); 2529 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2530 sizeof(nd_rd->nd_rd_dst)); 2531 } 2532 2533 p = (u_char *)(nd_rd + 1); 2534 2535 { 2536 /* target lladdr option */ 2537 struct llentry *ln = NULL; 2538 int len; 2539 struct nd_opt_hdr *nd_opt; 2540 char *lladdr; 2541 2542 ln = nd6_lookup(nexthop, ifp, false); 2543 if (ln == NULL) 2544 goto nolladdropt; 2545 len = sizeof(*nd_opt) + ifp->if_addrlen; 2546 len = (len + 7) & ~7; /* round by 8 */ 2547 /* safety check */ 2548 if (len + (p - (u_char *)ip6) > maxlen) { 2549 LLE_RUNLOCK(ln); 2550 goto nolladdropt; 2551 } 2552 if (ln->la_flags & LLE_VALID) { 2553 nd_opt = (struct nd_opt_hdr *)p; 2554 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 2555 nd_opt->nd_opt_len = len >> 3; 2556 lladdr = (char *)(nd_opt + 1); 2557 memcpy(lladdr, &ln->ll_addr, ifp->if_addrlen); 2558 p += len; 2559 } 2560 LLE_RUNLOCK(ln); 2561 } 2562 nolladdropt:; 2563 2564 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2565 2566 /* just to be safe */ 2567 if (m0->m_flags & M_DECRYPTED) 2568 goto noredhdropt; 2569 if (p - (u_char *)ip6 > maxlen) 2570 goto noredhdropt; 2571 2572 { 2573 /* redirected header option */ 2574 int len; 2575 struct nd_opt_rd_hdr *nd_opt_rh; 2576 2577 /* 2578 * compute the maximum size for icmp6 redirect header option. 2579 * XXX room for auth header? 2580 */ 2581 len = maxlen - (p - (u_char *)ip6); 2582 len &= ~7; 2583 2584 /* 2585 * Redirected header option spec (RFC2461 4.6.3) talks nothing 2586 * about padding/truncate rule for the original IP packet. 2587 * From the discussion on IPv6imp in Feb 1999, 2588 * the consensus was: 2589 * - "attach as much as possible" is the goal 2590 * - pad if not aligned (original size can be guessed by 2591 * original ip6 header) 2592 * Following code adds the padding if it is simple enough, 2593 * and truncates if not. 2594 */ 2595 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) { 2596 /* not enough room, truncate */ 2597 m_adj(m0, (len - sizeof(*nd_opt_rh)) - 2598 m0->m_pkthdr.len); 2599 } else { 2600 /* 2601 * enough room, truncate if not aligned. 2602 * we don't pad here for simplicity. 2603 */ 2604 size_t extra; 2605 2606 extra = m0->m_pkthdr.len % 8; 2607 if (extra) { 2608 /* truncate */ 2609 m_adj(m0, -extra); 2610 } 2611 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh); 2612 } 2613 2614 nd_opt_rh = (struct nd_opt_rd_hdr *)p; 2615 memset(nd_opt_rh, 0, sizeof(*nd_opt_rh)); 2616 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER; 2617 nd_opt_rh->nd_opt_rh_len = len >> 3; 2618 p += sizeof(*nd_opt_rh); 2619 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2620 2621 /* connect m0 to m */ 2622 m->m_pkthdr.len += m0->m_pkthdr.len; 2623 m_cat(m, m0); 2624 m0 = NULL; 2625 } 2626noredhdropt: 2627 if (m0) { 2628 m_freem(m0); 2629 m0 = NULL; 2630 } 2631 2632 /* XXX: clear embedded link IDs in the inner header */ 2633 in6_clearscope(&sip6->ip6_src); 2634 in6_clearscope(&sip6->ip6_dst); 2635 in6_clearscope(&nd_rd->nd_rd_target); 2636 in6_clearscope(&nd_rd->nd_rd_dst); 2637 2638 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 2639 2640 nd_rd->nd_rd_cksum = 0; 2641 nd_rd->nd_rd_cksum 2642 = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen)); 2643 2644 /* send the packet to outside... */ 2645 if (ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL) != 0) 2646 icmp6_ifstat_inc(ifp, ifs6_out_error); 2647 2648 icmp6_ifstat_inc(ifp, ifs6_out_msg); 2649 icmp6_ifstat_inc(ifp, ifs6_out_redirect); 2650 ICMP6_STATINC(ICMP6_STAT_OUTHIST + ND_REDIRECT); 2651 2652 return; 2653 2654fail: 2655 if (m) 2656 m_freem(m); 2657 if (m0) 2658 m_freem(m0); 2659} 2660 2661/* 2662 * ICMPv6 socket option processing. 2663 */ 2664int 2665icmp6_ctloutput(int op, struct socket *so, struct sockopt *sopt) 2666{ 2667 int error = 0; 2668 struct in6pcb *in6p = sotoin6pcb(so); 2669 2670 if (sopt->sopt_level != IPPROTO_ICMPV6) 2671 return rip6_ctloutput(op, so, sopt); 2672 2673 switch (op) { 2674 case PRCO_SETOPT: 2675 switch (sopt->sopt_name) { 2676 case ICMP6_FILTER: 2677 { 2678 struct icmp6_filter fil; 2679 2680 error = sockopt_get(sopt, &fil, sizeof(fil)); 2681 if (error) 2682 break; 2683 memcpy(in6p->in6p_icmp6filt, &fil, 2684 sizeof(struct icmp6_filter)); 2685 error = 0; 2686 break; 2687 } 2688 2689 default: 2690 error = ENOPROTOOPT; 2691 break; 2692 } 2693 break; 2694 2695 case PRCO_GETOPT: 2696 switch (sopt->sopt_name) { 2697 case ICMP6_FILTER: 2698 { 2699 if (in6p->in6p_icmp6filt == NULL) { 2700 error = EINVAL; 2701 break; 2702 } 2703 error = sockopt_set(sopt, in6p->in6p_icmp6filt, 2704 sizeof(struct icmp6_filter)); 2705 break; 2706 } 2707 2708 default: 2709 error = ENOPROTOOPT; 2710 break; 2711 } 2712 break; 2713 } 2714 2715 return (error); 2716} 2717 2718/* 2719 * Perform rate limit check. 2720 * Returns 0 if it is okay to send the icmp6 packet. 2721 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate 2722 * limitation. 2723 * 2724 * XXX per-destination/type check necessary? 2725 */ 2726static int 2727icmp6_ratelimit( 2728 const struct in6_addr *dst, /* not used at this moment */ 2729 const int type, /* not used at this moment */ 2730 const int code) /* not used at this moment */ 2731{ 2732 int ret; 2733 2734 ret = 0; /* okay to send */ 2735 2736 /* PPS limit */ 2737 if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count, 2738 icmp6errppslim)) { 2739 /* The packet is subject to rate limit */ 2740 ret++; 2741 } 2742 2743 return ret; 2744} 2745 2746static struct rtentry * 2747icmp6_mtudisc_clone(struct sockaddr *dst) 2748{ 2749 struct rtentry *rt; 2750 int error; 2751 2752 rt = rtalloc1(dst, 1); 2753 if (rt == 0) 2754 return NULL; 2755 2756 /* If we didn't get a host route, allocate one */ 2757 if ((rt->rt_flags & RTF_HOST) == 0) { 2758 struct rtentry *nrt; 2759 2760 error = rtrequest(RTM_ADD, dst, rt->rt_gateway, NULL, 2761 RTF_GATEWAY | RTF_HOST | RTF_DYNAMIC, &nrt); 2762 if (error) { 2763 rtfree(rt); 2764 return NULL; 2765 } 2766 nrt->rt_rmx = rt->rt_rmx; 2767 rtfree(rt); 2768 rt = nrt; 2769 } 2770 error = rt_timer_add(rt, icmp6_mtudisc_timeout, 2771 icmp6_mtudisc_timeout_q); 2772 if (error) { 2773 rtfree(rt); 2774 return NULL; 2775 } 2776 2777 return rt; /* caller need to call rtfree() */ 2778} 2779 2780static void 2781icmp6_mtudisc_timeout(struct rtentry *rt, struct rttimer *r) 2782{ 2783 2784 KASSERT(rt != NULL); 2785 rt_assert_referenced(rt); 2786 2787 if ((rt->rt_flags & (RTF_DYNAMIC | RTF_HOST)) == 2788 (RTF_DYNAMIC | RTF_HOST)) { 2789 rtrequest(RTM_DELETE, rt_getkey(rt), 2790 rt->rt_gateway, rt_mask(rt), rt->rt_flags, NULL); 2791 } else { 2792 if (!(rt->rt_rmx.rmx_locks & RTV_MTU)) 2793 rt->rt_rmx.rmx_mtu = 0; 2794 } 2795} 2796 2797static void 2798icmp6_redirect_timeout(struct rtentry *rt, struct rttimer *r) 2799{ 2800 2801 KASSERT(rt != NULL); 2802 rt_assert_referenced(rt); 2803 2804 if ((rt->rt_flags & (RTF_GATEWAY | RTF_DYNAMIC | RTF_HOST)) == 2805 (RTF_GATEWAY | RTF_DYNAMIC | RTF_HOST)) { 2806 rtrequest(RTM_DELETE, rt_getkey(rt), 2807 rt->rt_gateway, rt_mask(rt), rt->rt_flags, NULL); 2808 } 2809} 2810 2811/* 2812 * sysctl helper routine for the net.inet6.icmp6.nd6 nodes. silly? 2813 */ 2814static int 2815sysctl_net_inet6_icmp6_nd6(SYSCTLFN_ARGS) 2816{ 2817 (void)&name; 2818 (void)&l; 2819 (void)&oname; 2820 2821 if (namelen != 0) 2822 return (EINVAL); 2823 2824 return (nd6_sysctl(rnode->sysctl_num, oldp, oldlenp, 2825 /*XXXUNCONST*/ 2826 __UNCONST(newp), newlen)); 2827} 2828 2829static int 2830sysctl_net_inet6_icmp6_stats(SYSCTLFN_ARGS) 2831{ 2832 2833 return (NETSTAT_SYSCTL(icmp6stat_percpu, ICMP6_NSTATS)); 2834} 2835 2836static int 2837sysctl_net_inet6_icmp6_redirtimeout(SYSCTLFN_ARGS) 2838{ 2839 int error, tmp; 2840 struct sysctlnode node; 2841 2842 node = *rnode; 2843 node.sysctl_data = &tmp; 2844 tmp = icmp6_redirtimeout; 2845 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 2846 if (error || newp == NULL) 2847 return error; 2848 if (tmp < 0) 2849 return EINVAL; 2850 icmp6_redirtimeout = tmp; 2851 2852 if (icmp6_redirect_timeout_q != NULL) { 2853 if (icmp6_redirtimeout == 0) { 2854 rt_timer_queue_destroy(icmp6_redirect_timeout_q); 2855 } else { 2856 rt_timer_queue_change(icmp6_redirect_timeout_q, 2857 icmp6_redirtimeout); 2858 } 2859 } else if (icmp6_redirtimeout > 0) { 2860 icmp6_redirect_timeout_q = 2861 rt_timer_queue_create(icmp6_redirtimeout); 2862 } 2863 2864 return 0; 2865} 2866 2867static void 2868sysctl_net_inet6_icmp6_setup(struct sysctllog **clog) 2869{ 2870 extern int nd6_maxqueuelen; /* defined in nd6.c */ 2871 2872 sysctl_createv(clog, 0, NULL, NULL, 2873 CTLFLAG_PERMANENT, 2874 CTLTYPE_NODE, "inet6", NULL, 2875 NULL, 0, NULL, 0, 2876 CTL_NET, PF_INET6, CTL_EOL); 2877 sysctl_createv(clog, 0, NULL, NULL, 2878 CTLFLAG_PERMANENT, 2879 CTLTYPE_NODE, "icmp6", 2880 SYSCTL_DESCR("ICMPv6 related settings"), 2881 NULL, 0, NULL, 0, 2882 CTL_NET, PF_INET6, IPPROTO_ICMPV6, CTL_EOL); 2883 2884 sysctl_createv(clog, 0, NULL, NULL, 2885 CTLFLAG_PERMANENT, 2886 CTLTYPE_STRUCT, "stats", 2887 SYSCTL_DESCR("ICMPv6 transmission statistics"), 2888 sysctl_net_inet6_icmp6_stats, 0, NULL, 0, 2889 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2890 ICMPV6CTL_STATS, CTL_EOL); 2891 sysctl_createv(clog, 0, NULL, NULL, 2892 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2893 CTLTYPE_INT, "rediraccept", 2894 SYSCTL_DESCR("Accept and process redirect messages"), 2895 NULL, 0, &icmp6_rediraccept, 0, 2896 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2897 ICMPV6CTL_REDIRACCEPT, CTL_EOL); 2898 sysctl_createv(clog, 0, NULL, NULL, 2899 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2900 CTLTYPE_INT, "redirtimeout", 2901 SYSCTL_DESCR("Redirect generated route lifetime"), 2902 sysctl_net_inet6_icmp6_redirtimeout, 0, 2903 &icmp6_redirtimeout, 0, 2904 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2905 ICMPV6CTL_REDIRTIMEOUT, CTL_EOL); 2906#if 0 /* obsoleted */ 2907 sysctl_createv(clog, 0, NULL, NULL, 2908 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2909 CTLTYPE_INT, "errratelimit", NULL, 2910 NULL, 0, &icmp6_errratelimit, 0, 2911 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2912 ICMPV6CTL_ERRRATELIMIT, CTL_EOL); 2913#endif 2914 sysctl_createv(clog, 0, NULL, NULL, 2915 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2916 CTLTYPE_INT, "nd6_prune", 2917 SYSCTL_DESCR("Neighbor discovery prune interval"), 2918 NULL, 0, &nd6_prune, 0, 2919 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2920 ICMPV6CTL_ND6_PRUNE, CTL_EOL); 2921 sysctl_createv(clog, 0, NULL, NULL, 2922 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2923 CTLTYPE_INT, "nd6_delay", 2924 SYSCTL_DESCR("First probe delay time"), 2925 NULL, 0, &nd6_delay, 0, 2926 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2927 ICMPV6CTL_ND6_DELAY, CTL_EOL); 2928 sysctl_createv(clog, 0, NULL, NULL, 2929 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2930 CTLTYPE_INT, "nd6_umaxtries", 2931 SYSCTL_DESCR("Number of unicast discovery attempts"), 2932 NULL, 0, &nd6_umaxtries, 0, 2933 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2934 ICMPV6CTL_ND6_UMAXTRIES, CTL_EOL); 2935 sysctl_createv(clog, 0, NULL, NULL, 2936 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2937 CTLTYPE_INT, "nd6_mmaxtries", 2938 SYSCTL_DESCR("Number of multicast discovery attempts"), 2939 NULL, 0, &nd6_mmaxtries, 0, 2940 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2941 ICMPV6CTL_ND6_MMAXTRIES, CTL_EOL); 2942 sysctl_createv(clog, 0, NULL, NULL, 2943 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2944 CTLTYPE_INT, "nd6_useloopback", 2945 SYSCTL_DESCR("Use loopback interface for local traffic"), 2946 NULL, 0, &nd6_useloopback, 0, 2947 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2948 ICMPV6CTL_ND6_USELOOPBACK, CTL_EOL); 2949#if 0 /* obsoleted */ 2950 sysctl_createv(clog, 0, NULL, NULL, 2951 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2952 CTLTYPE_INT, "nd6_proxyall", NULL, 2953 NULL, 0, &nd6_proxyall, 0, 2954 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2955 ICMPV6CTL_ND6_PROXYALL, CTL_EOL); 2956#endif 2957 sysctl_createv(clog, 0, NULL, NULL, 2958 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2959 CTLTYPE_INT, "nodeinfo", 2960 SYSCTL_DESCR("Respond to node information requests"), 2961 NULL, 0, &icmp6_nodeinfo, 0, 2962 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2963 ICMPV6CTL_NODEINFO, CTL_EOL); 2964 sysctl_createv(clog, 0, NULL, NULL, 2965 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2966 CTLTYPE_INT, "errppslimit", 2967 SYSCTL_DESCR("Maximum ICMP errors sent per second"), 2968 NULL, 0, &icmp6errppslim, 0, 2969 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2970 ICMPV6CTL_ERRPPSLIMIT, CTL_EOL); 2971 sysctl_createv(clog, 0, NULL, NULL, 2972 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2973 CTLTYPE_INT, "nd6_maxnudhint", 2974 SYSCTL_DESCR("Maximum neighbor unreachable hint count"), 2975 NULL, 0, &nd6_maxnudhint, 0, 2976 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2977 ICMPV6CTL_ND6_MAXNUDHINT, CTL_EOL); 2978 sysctl_createv(clog, 0, NULL, NULL, 2979 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2980 CTLTYPE_INT, "mtudisc_hiwat", 2981 SYSCTL_DESCR("Low mark on MTU Discovery route timers"), 2982 NULL, 0, &icmp6_mtudisc_hiwat, 0, 2983 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2984 ICMPV6CTL_MTUDISC_HIWAT, CTL_EOL); 2985 sysctl_createv(clog, 0, NULL, NULL, 2986 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2987 CTLTYPE_INT, "mtudisc_lowat", 2988 SYSCTL_DESCR("Low mark on MTU Discovery route timers"), 2989 NULL, 0, &icmp6_mtudisc_lowat, 0, 2990 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2991 ICMPV6CTL_MTUDISC_LOWAT, CTL_EOL); 2992 sysctl_createv(clog, 0, NULL, NULL, 2993 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2994 CTLTYPE_INT, "nd6_debug", 2995 SYSCTL_DESCR("Enable neighbor discovery debug output"), 2996 NULL, 0, &nd6_debug, 0, 2997 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2998 ICMPV6CTL_ND6_DEBUG, CTL_EOL); 2999 sysctl_createv(clog, 0, NULL, NULL, 3000 CTLFLAG_PERMANENT, 3001 CTLTYPE_STRUCT, "nd6_drlist", 3002 SYSCTL_DESCR("Default router list"), 3003 sysctl_net_inet6_icmp6_nd6, 0, NULL, 0, 3004 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3005 ICMPV6CTL_ND6_DRLIST, CTL_EOL); 3006 sysctl_createv(clog, 0, NULL, NULL, 3007 CTLFLAG_PERMANENT, 3008 CTLTYPE_STRUCT, "nd6_prlist", 3009 SYSCTL_DESCR("Prefix list"), 3010 sysctl_net_inet6_icmp6_nd6, 0, NULL, 0, 3011 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3012 ICMPV6CTL_ND6_PRLIST, CTL_EOL); 3013 sysctl_createv(clog, 0, NULL, NULL, 3014 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3015 CTLTYPE_INT, "maxqueuelen", 3016 SYSCTL_DESCR("max packet queue len for a unresolved ND"), 3017 NULL, 1, &nd6_maxqueuelen, 0, 3018 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3019 ICMPV6CTL_ND6_MAXQLEN, CTL_EOL); 3020} 3021 3022void 3023icmp6_statinc(u_int stat) 3024{ 3025 3026 KASSERT(stat < ICMP6_NSTATS); 3027 ICMP6_STATINC(stat); 3028} 3029