icmp6.c revision 1.216
1/* $NetBSD: icmp6.c,v 1.216 2018/01/23 09:21:59 maxv 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 1.216 2018/01/23 09:21:59 maxv 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 <netinet/wqinput.h> 94#include <netinet6/ip6_var.h> 95#include <netinet6/ip6_private.h> 96#include <netinet/icmp6.h> 97#include <netinet6/icmp6_private.h> 98#include <netinet6/mld6_var.h> 99#include <netinet6/in6_pcb.h> 100#include <netinet6/nd6.h> 101#include <netinet6/in6_ifattach.h> 102#include <netinet6/ip6protosw.h> 103#include <netinet6/scope6_var.h> 104 105#ifdef IPSEC 106#include <netipsec/ipsec.h> 107#include <netipsec/ipsec_var.h> 108#include <netipsec/ipsec_private.h> 109#include <netipsec/ipsec6.h> 110#include <netipsec/key.h> 111#endif 112 113 114#include "faith.h" 115#if defined(NFAITH) && 0 < NFAITH 116#include <net/if_faith.h> 117#endif 118 119#include <net/net_osdep.h> 120 121extern struct domain inet6domain; 122 123percpu_t *icmp6stat_percpu; 124 125extern struct inpcbtable raw6cbtable; 126extern int icmp6errppslim; 127static int icmp6errpps_count = 0; 128static struct timeval icmp6errppslim_last; 129extern int icmp6_nodeinfo; 130 131/* 132 * List of callbacks to notify when Path MTU changes are made. 133 */ 134struct icmp6_mtudisc_callback { 135 LIST_ENTRY(icmp6_mtudisc_callback) mc_list; 136 void (*mc_func)(struct in6_addr *); 137}; 138 139LIST_HEAD(, icmp6_mtudisc_callback) icmp6_mtudisc_callbacks = 140 LIST_HEAD_INITIALIZER(&icmp6_mtudisc_callbacks); 141 142static struct rttimer_queue *icmp6_mtudisc_timeout_q = NULL; 143extern int pmtu_expire; 144 145/* XXX do these values make any sense? */ 146static int icmp6_mtudisc_hiwat = 1280; 147static int icmp6_mtudisc_lowat = 256; 148 149/* 150 * keep track of # of redirect routes. 151 */ 152static struct rttimer_queue *icmp6_redirect_timeout_q = NULL; 153 154/* XXX experimental, turned off */ 155static int icmp6_redirect_hiwat = -1; 156static int icmp6_redirect_lowat = -1; 157 158/* Protect mtudisc and redirect stuffs */ 159static kmutex_t icmp6_mtx __cacheline_aligned; 160 161static void icmp6_errcount(u_int, int, int); 162static int icmp6_rip6_input(struct mbuf **, int); 163static int icmp6_ratelimit(const struct in6_addr *, const int, const int); 164static const char *icmp6_redirect_diag(char *, size_t, struct in6_addr *, 165 struct in6_addr *, struct in6_addr *); 166static struct mbuf *ni6_input(struct mbuf *, int); 167static struct mbuf *ni6_nametodns(const char *, int, int); 168static int ni6_dnsmatch(const char *, int, const char *, int); 169static int ni6_addrs(struct icmp6_nodeinfo *, struct mbuf *, 170 struct ifnet **, char *, struct psref *); 171static int ni6_store_addrs(struct icmp6_nodeinfo *, struct icmp6_nodeinfo *, 172 struct ifnet *, int); 173static int icmp6_notify_error(struct mbuf *, int, int, int); 174static struct rtentry *icmp6_mtudisc_clone(struct sockaddr *); 175static void icmp6_mtudisc_timeout(struct rtentry *, struct rttimer *); 176static void icmp6_redirect_timeout(struct rtentry *, struct rttimer *); 177static void sysctl_net_inet6_icmp6_setup(struct sysctllog **); 178 179/* workqueue-based pr_input */ 180static struct wqinput *icmp6_wqinput; 181static void _icmp6_input(struct mbuf *m, int off, int proto); 182 183void 184icmp6_init(void) 185{ 186 187 sysctl_net_inet6_icmp6_setup(NULL); 188 mld_init(); 189 190 mutex_init(&icmp6_mtx, MUTEX_DEFAULT, IPL_NONE); 191 mutex_enter(&icmp6_mtx); 192 icmp6_mtudisc_timeout_q = rt_timer_queue_create(pmtu_expire); 193 icmp6_redirect_timeout_q = rt_timer_queue_create(icmp6_redirtimeout); 194 mutex_exit(&icmp6_mtx); 195 196 icmp6stat_percpu = percpu_alloc(sizeof(uint64_t) * ICMP6_NSTATS); 197 198 icmp6_wqinput = wqinput_create("icmp6", _icmp6_input); 199} 200 201static void 202icmp6_errcount(u_int base, int type, int code) 203{ 204 switch (type) { 205 case ICMP6_DST_UNREACH: 206 switch (code) { 207 case ICMP6_DST_UNREACH_NOROUTE: 208 ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_NOROUTE); 209 return; 210 case ICMP6_DST_UNREACH_ADMIN: 211 ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_ADMIN); 212 return; 213 case ICMP6_DST_UNREACH_BEYONDSCOPE: 214 ICMP6_STATINC(base + 215 ICMP6_ERRSTAT_DST_UNREACH_BEYONDSCOPE); 216 return; 217 case ICMP6_DST_UNREACH_ADDR: 218 ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_ADDR); 219 return; 220 case ICMP6_DST_UNREACH_NOPORT: 221 ICMP6_STATINC(base + ICMP6_ERRSTAT_DST_UNREACH_NOPORT); 222 return; 223 } 224 break; 225 case ICMP6_PACKET_TOO_BIG: 226 ICMP6_STATINC(base + ICMP6_ERRSTAT_PACKET_TOO_BIG); 227 return; 228 case ICMP6_TIME_EXCEEDED: 229 switch (code) { 230 case ICMP6_TIME_EXCEED_TRANSIT: 231 ICMP6_STATINC(base + ICMP6_ERRSTAT_TIME_EXCEED_TRANSIT); 232 return; 233 case ICMP6_TIME_EXCEED_REASSEMBLY: 234 ICMP6_STATINC(base + 235 ICMP6_ERRSTAT_TIME_EXCEED_REASSEMBLY); 236 return; 237 } 238 break; 239 case ICMP6_PARAM_PROB: 240 switch (code) { 241 case ICMP6_PARAMPROB_HEADER: 242 ICMP6_STATINC(base + ICMP6_ERRSTAT_PARAMPROB_HEADER); 243 return; 244 case ICMP6_PARAMPROB_NEXTHEADER: 245 ICMP6_STATINC(base + 246 ICMP6_ERRSTAT_PARAMPROB_NEXTHEADER); 247 return; 248 case ICMP6_PARAMPROB_OPTION: 249 ICMP6_STATINC(base + ICMP6_ERRSTAT_PARAMPROB_OPTION); 250 return; 251 } 252 break; 253 case ND_REDIRECT: 254 ICMP6_STATINC(base + ICMP6_ERRSTAT_REDIRECT); 255 return; 256 } 257 ICMP6_STATINC(base + ICMP6_ERRSTAT_UNKNOWN); 258} 259 260/* 261 * Register a Path MTU Discovery callback. 262 */ 263void 264icmp6_mtudisc_callback_register(void (*func)(struct in6_addr *)) 265{ 266 struct icmp6_mtudisc_callback *mc, *new; 267 268 new = kmem_alloc(sizeof(*mc), KM_SLEEP); 269 270 mutex_enter(&icmp6_mtx); 271 for (mc = LIST_FIRST(&icmp6_mtudisc_callbacks); mc != NULL; 272 mc = LIST_NEXT(mc, mc_list)) { 273 if (mc->mc_func == func) { 274 mutex_exit(&icmp6_mtx); 275 kmem_free(new, sizeof(*mc)); 276 return; 277 } 278 } 279 280 new->mc_func = func; 281 LIST_INSERT_HEAD(&icmp6_mtudisc_callbacks, new, mc_list); 282 mutex_exit(&icmp6_mtx); 283} 284 285/* 286 * A wrapper function for icmp6_error() necessary when the erroneous packet 287 * may not contain enough scope zone information. 288 */ 289void 290icmp6_error2(struct mbuf *m, int type, int code, int param, 291 struct ifnet *ifp) 292{ 293 struct ip6_hdr *ip6; 294 295 KASSERT(ifp != NULL); 296 297 if (m->m_len < sizeof(struct ip6_hdr)) { 298 m = m_pullup(m, sizeof(struct ip6_hdr)); 299 if (m == NULL) 300 return; 301 } 302 303 ip6 = mtod(m, struct ip6_hdr *); 304 305 if (in6_setscope(&ip6->ip6_src, ifp, NULL) != 0) 306 goto out; 307 if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0) 308 goto out; 309 310 icmp6_error(m, type, code, param); 311 return; 312 313out: 314 m_freem(m); 315} 316 317/* 318 * Generate an error packet of type error in response to bad IP6 packet. 319 */ 320void 321icmp6_error(struct mbuf *m, int type, int code, int param) 322{ 323 struct ip6_hdr *oip6, *nip6; 324 struct icmp6_hdr *icmp6; 325 u_int preplen; 326 int off; 327 int nxt; 328 329 ICMP6_STATINC(ICMP6_STAT_ERROR); 330 331 /* count per-type-code statistics */ 332 icmp6_errcount(ICMP6_STAT_OUTERRHIST, type, code); 333 334 if (m->m_flags & M_DECRYPTED) { 335 ICMP6_STATINC(ICMP6_STAT_CANTERROR); 336 goto freeit; 337 } 338 339 if (M_UNWRITABLE(m, sizeof(struct ip6_hdr)) && 340 (m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) 341 return; 342 oip6 = mtod(m, struct ip6_hdr *); 343 344 /* 345 * If the destination address of the erroneous packet is a multicast 346 * address, or the packet was sent using link-layer multicast, 347 * we should basically suppress sending an error (RFC 2463, Section 348 * 2.4). 349 * We have two exceptions (the item e.2 in that section): 350 * - the Packet Too Big message can be sent for path MTU discovery. 351 * - the Parameter Problem Message that can be allowed an icmp6 error 352 * in the option type field. This check has been done in 353 * ip6_unknown_opt(), so we can just check the type and code. 354 */ 355 if ((m->m_flags & (M_BCAST|M_MCAST) || 356 IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) && 357 (type != ICMP6_PACKET_TOO_BIG && 358 (type != ICMP6_PARAM_PROB || 359 code != ICMP6_PARAMPROB_OPTION))) 360 goto freeit; 361 362 /* 363 * RFC 2463, 2.4 (e.5): source address check. 364 * XXX: the case of anycast source? 365 */ 366 if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) || 367 IN6_IS_ADDR_MULTICAST(&oip6->ip6_src)) 368 goto freeit; 369 370 /* 371 * If we are about to send ICMPv6 against ICMPv6 error/redirect, 372 * don't do it. 373 */ 374 nxt = -1; 375 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 376 if (off >= 0 && nxt == IPPROTO_ICMPV6) { 377 struct icmp6_hdr *icp; 378 379 IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off, 380 sizeof(*icp)); 381 if (icp == NULL) { 382 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 383 return; 384 } 385 if (icp->icmp6_type < ICMP6_ECHO_REQUEST || 386 icp->icmp6_type == ND_REDIRECT) { 387 /* 388 * ICMPv6 error 389 * Special case: for redirect (which is 390 * informational) we must not send icmp6 error. 391 */ 392 ICMP6_STATINC(ICMP6_STAT_CANTERROR); 393 goto freeit; 394 } else { 395 /* ICMPv6 informational - send the error */ 396 } 397 } else { 398 /* non-ICMPv6 - send the error */ 399 } 400 401 oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */ 402 403 /* Finally, do rate limitation check. */ 404 if (icmp6_ratelimit(&oip6->ip6_src, type, code)) { 405 ICMP6_STATINC(ICMP6_STAT_TOOFREQ); 406 goto freeit; 407 } 408 409 /* 410 * OK, ICMP6 can be generated. 411 */ 412 413 if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN) 414 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len); 415 416 preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 417 M_PREPEND(m, preplen, M_DONTWAIT); 418 if (m && M_UNWRITABLE(m, preplen)) 419 m = m_pullup(m, preplen); 420 if (m == NULL) { 421 nd6log(LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__); 422 return; 423 } 424 425 nip6 = mtod(m, struct ip6_hdr *); 426 nip6->ip6_src = oip6->ip6_src; 427 nip6->ip6_dst = oip6->ip6_dst; 428 429 in6_clearscope(&oip6->ip6_src); 430 in6_clearscope(&oip6->ip6_dst); 431 432 icmp6 = (struct icmp6_hdr *)(nip6 + 1); 433 icmp6->icmp6_type = type; 434 icmp6->icmp6_code = code; 435 icmp6->icmp6_pptr = htonl((u_int32_t)param); 436 437 /* 438 * icmp6_reflect() is designed to be in the input path. 439 * icmp6_error() can be called from both input and output path, 440 * and if we are in output path rcvif could contain bogus value. 441 * clear m->m_pkthdr.rcvif for safety, we should have enough scope 442 * information in ip header (nip6). 443 */ 444 m_reset_rcvif(m); 445 446 ICMP6_STATINC(ICMP6_STAT_OUTHIST + type); 447 448 /* header order: IPv6 - ICMPv6 */ 449 icmp6_reflect(m, sizeof(struct ip6_hdr)); 450 451 return; 452 453freeit: 454 /* 455 * If we can't tell whether or not we can generate ICMP6, free it. 456 */ 457 m_freem(m); 458} 459 460/* 461 * Process a received ICMP6 message. 462 */ 463static void 464_icmp6_input(struct mbuf *m, int off, int proto) 465{ 466 struct mbuf *n; 467 struct ip6_hdr *ip6, *nip6; 468 struct icmp6_hdr *icmp6, *nicmp6; 469 int icmp6len = m->m_pkthdr.len - off; 470 int code, sum; 471 struct ifnet *rcvif; 472 struct psref psref; 473 char ip6buf[INET6_ADDRSTRLEN], ip6buf2[INET6_ADDRSTRLEN]; 474 475 rcvif = m_get_rcvif_psref(m, &psref); 476 if (__predict_false(rcvif == NULL)) 477 goto freeit; 478 479#define ICMP6_MAXLEN (sizeof(*nip6) + sizeof(*nicmp6) + 4) 480 KASSERT(ICMP6_MAXLEN < MCLBYTES); 481 icmp6_ifstat_inc(rcvif, ifs6_in_msg); 482 483 /* 484 * Locate icmp6 structure in mbuf, and check 485 * that not corrupted and of at least minimum length 486 */ 487 488 if (icmp6len < sizeof(struct icmp6_hdr)) { 489 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 490 icmp6_ifstat_inc(rcvif, ifs6_in_error); 491 goto freeit; 492 } 493 494 if (m->m_len < sizeof(struct ip6_hdr)) { 495 m = m_pullup(m, sizeof(struct ip6_hdr)); 496 if (m == NULL) { 497 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 498 icmp6_ifstat_inc(rcvif, ifs6_in_error); 499 goto freeit; 500 } 501 } 502 503 ip6 = mtod(m, struct ip6_hdr *); 504 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 505 if (icmp6 == NULL) { 506 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 507 icmp6_ifstat_inc(rcvif, ifs6_in_error); 508 goto freeit; 509 } 510 511 /* 512 * Enforce alignment requirements that are violated in 513 * some cases, see kern/50766 for details. 514 */ 515 if (IP6_HDR_ALIGNED_P(icmp6) == 0) { 516 m = m_copyup(m, off + sizeof(struct icmp6_hdr), 0); 517 if (m == NULL) { 518 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 519 icmp6_ifstat_inc(rcvif, ifs6_in_error); 520 goto freeit; 521 } 522 ip6 = mtod(m, struct ip6_hdr *); 523 icmp6 = (struct icmp6_hdr *)(mtod(m, char *) + off); 524 } 525 KASSERT(IP6_HDR_ALIGNED_P(icmp6)); 526 527 /* 528 * calculate the checksum 529 */ 530 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) { 531 nd6log(LOG_ERR, "ICMP6 checksum error(%d|%x) %s\n", 532 icmp6->icmp6_type, sum, IN6_PRINT(ip6buf, &ip6->ip6_src)); 533 ICMP6_STATINC(ICMP6_STAT_CHECKSUM); 534 icmp6_ifstat_inc(rcvif, ifs6_in_error); 535 goto freeit; 536 } 537 538#if defined(NFAITH) && 0 < NFAITH 539 if (faithprefix(&ip6->ip6_dst)) { 540 /* 541 * Deliver very specific ICMP6 type only. 542 * This is important to deliver TOOBIG. Otherwise PMTUD 543 * will not work. 544 */ 545 switch (icmp6->icmp6_type) { 546 case ICMP6_DST_UNREACH: 547 case ICMP6_PACKET_TOO_BIG: 548 case ICMP6_TIME_EXCEEDED: 549 break; 550 default: 551 goto freeit; 552 } 553 } 554#endif 555 556 code = icmp6->icmp6_code; 557 ICMP6_STATINC(ICMP6_STAT_INHIST + icmp6->icmp6_type); 558 559 switch (icmp6->icmp6_type) { 560 case ICMP6_DST_UNREACH: 561 icmp6_ifstat_inc(rcvif, ifs6_in_dstunreach); 562 switch (code) { 563 case ICMP6_DST_UNREACH_NOROUTE: 564 code = PRC_UNREACH_NET; 565 break; 566 case ICMP6_DST_UNREACH_ADMIN: 567 icmp6_ifstat_inc(rcvif, ifs6_in_adminprohib); 568 code = PRC_UNREACH_PROTOCOL; /* is this a good code? */ 569 break; 570 case ICMP6_DST_UNREACH_ADDR: 571 code = PRC_HOSTDEAD; 572 break; 573#ifdef COMPAT_RFC1885 574 case ICMP6_DST_UNREACH_NOTNEIGHBOR: 575 code = PRC_UNREACH_SRCFAIL; 576 break; 577#else 578 case ICMP6_DST_UNREACH_BEYONDSCOPE: 579 /* I mean "source address was incorrect." */ 580 code = PRC_UNREACH_NET; 581 break; 582#endif 583 case ICMP6_DST_UNREACH_NOPORT: 584 code = PRC_UNREACH_PORT; 585 break; 586 default: 587 goto badcode; 588 } 589 goto deliver; 590 591 case ICMP6_PACKET_TOO_BIG: 592 icmp6_ifstat_inc(rcvif, ifs6_in_pkttoobig); 593 594 /* 595 * MTU is checked in icmp6_mtudisc. 596 */ 597 code = PRC_MSGSIZE; 598 599 /* 600 * Updating the path MTU will be done after examining 601 * intermediate extension headers. 602 */ 603 goto deliver; 604 605 case ICMP6_TIME_EXCEEDED: 606 icmp6_ifstat_inc(rcvif, ifs6_in_timeexceed); 607 switch (code) { 608 case ICMP6_TIME_EXCEED_TRANSIT: 609 code = PRC_TIMXCEED_INTRANS; 610 break; 611 case ICMP6_TIME_EXCEED_REASSEMBLY: 612 code = PRC_TIMXCEED_REASS; 613 break; 614 default: 615 goto badcode; 616 } 617 goto deliver; 618 619 case ICMP6_PARAM_PROB: 620 icmp6_ifstat_inc(rcvif, ifs6_in_paramprob); 621 switch (code) { 622 case ICMP6_PARAMPROB_NEXTHEADER: 623 code = PRC_UNREACH_PROTOCOL; 624 break; 625 case ICMP6_PARAMPROB_HEADER: 626 case ICMP6_PARAMPROB_OPTION: 627 code = PRC_PARAMPROB; 628 break; 629 default: 630 goto badcode; 631 } 632 goto deliver; 633 634 case ICMP6_ECHO_REQUEST: 635 icmp6_ifstat_inc(rcvif, ifs6_in_echo); 636 if (code != 0) 637 goto badcode; 638 /* 639 * Copy mbuf to send to two data paths: userland socket(s), 640 * and to the querier (echo reply). 641 * m: a copy for socket, n: a copy for querier 642 * 643 * If the first mbuf is shared, or the first mbuf is too short, 644 * copy the first part of the data into a fresh mbuf. 645 * Otherwise, we will wrongly overwrite both copies. 646 */ 647 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 648 /* Give up local */ 649 n = m; 650 m = NULL; 651 } else if (M_READONLY(n) || 652 n->m_len < off + sizeof(struct icmp6_hdr)) { 653 struct mbuf *n0 = n; 654 655 /* 656 * Prepare an internal mbuf. m_pullup() doesn't 657 * always copy the length we specified. 658 */ 659 if ((n = m_dup(n0, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 660 /* Give up local */ 661 n = m; 662 m = NULL; 663 } 664 m_freem(n0); 665 } 666 IP6_EXTHDR_GET(nicmp6, struct icmp6_hdr *, n, off, 667 sizeof(*nicmp6)); 668 if (nicmp6 == NULL) 669 goto freeit; 670 nicmp6->icmp6_type = ICMP6_ECHO_REPLY; 671 nicmp6->icmp6_code = 0; 672 if (n) { 673 uint64_t *icmp6s = ICMP6_STAT_GETREF(); 674 icmp6s[ICMP6_STAT_REFLECT]++; 675 icmp6s[ICMP6_STAT_OUTHIST + ICMP6_ECHO_REPLY]++; 676 ICMP6_STAT_PUTREF(); 677 icmp6_reflect(n, off); 678 } 679 if (!m) 680 goto freeit; 681 break; 682 683 case ICMP6_ECHO_REPLY: 684 icmp6_ifstat_inc(rcvif, ifs6_in_echoreply); 685 if (code != 0) 686 goto badcode; 687 break; 688 689 case MLD_LISTENER_QUERY: 690 case MLD_LISTENER_REPORT: 691 if (icmp6len < sizeof(struct mld_hdr)) 692 goto badlen; 693 if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */ 694 icmp6_ifstat_inc(rcvif, ifs6_in_mldquery); 695 else 696 icmp6_ifstat_inc(rcvif, ifs6_in_mldreport); 697 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 698 /* give up local */ 699 mld_input(m, off); 700 m = NULL; 701 goto freeit; 702 } 703 mld_input(n, off); 704 /* m stays. */ 705 break; 706 707 case MLD_LISTENER_DONE: 708 icmp6_ifstat_inc(rcvif, ifs6_in_mlddone); 709 if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */ 710 goto badlen; 711 break; /* nothing to be done in kernel */ 712 713 case MLD_MTRACE_RESP: 714 case MLD_MTRACE: 715 /* XXX: these two are experimental. not officially defined. */ 716 /* XXX: per-interface statistics? */ 717 break; /* just pass it to applications */ 718 719 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */ 720 { 721 enum { WRU, FQDN } mode; 722 723 if (!icmp6_nodeinfo) 724 break; 725 726 if (icmp6len == sizeof(struct icmp6_hdr) + 4) 727 mode = WRU; 728 else if (icmp6len >= sizeof(struct icmp6_nodeinfo)) 729 mode = FQDN; 730 else 731 goto badlen; 732 733 if (mode == FQDN) { 734 n = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 735 if (n) 736 n = ni6_input(n, off); 737 } else { 738 u_char *p; 739 int maxhlen; 740 741 if ((icmp6_nodeinfo & 5) != 5) 742 break; 743 744 if (code != 0) 745 goto badcode; 746 MGETHDR(n, M_DONTWAIT, m->m_type); 747 if (n && ICMP6_MAXLEN > MHLEN) { 748 MCLGET(n, M_DONTWAIT); 749 if ((n->m_flags & M_EXT) == 0) { 750 m_free(n); 751 n = NULL; 752 } 753 } 754 if (n == NULL) { 755 /* Give up remote */ 756 break; 757 } 758 m_reset_rcvif(n); 759 n->m_len = 0; 760 maxhlen = M_TRAILINGSPACE(n) - ICMP6_MAXLEN; 761 if (maxhlen < 0) { 762 m_free(n); 763 break; 764 } 765 if (maxhlen > hostnamelen) 766 maxhlen = hostnamelen; 767 /* 768 * Copy IPv6 and ICMPv6 only. 769 */ 770 nip6 = mtod(n, struct ip6_hdr *); 771 memcpy(nip6, ip6, sizeof(struct ip6_hdr)); 772 nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 773 memcpy(nicmp6, icmp6, sizeof(struct icmp6_hdr)); 774 775 p = (u_char *)(nicmp6 + 1); 776 memset(p, 0, 4); 777 memcpy(p + 4, hostname, maxhlen); /* meaningless TTL */ 778 779 M_COPY_PKTHDR(n, m); /* just for rcvif */ 780 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 781 sizeof(struct icmp6_hdr) + 4 + maxhlen; 782 nicmp6->icmp6_type = ICMP6_WRUREPLY; 783 nicmp6->icmp6_code = 0; 784 } 785 if (n) { 786 uint64_t *icmp6s = ICMP6_STAT_GETREF(); 787 icmp6s[ICMP6_STAT_REFLECT]++; 788 icmp6s[ICMP6_STAT_OUTHIST + ICMP6_WRUREPLY]++; 789 ICMP6_STAT_PUTREF(); 790 icmp6_reflect(n, sizeof(struct ip6_hdr)); 791 } 792 break; 793 } 794 795 case ICMP6_WRUREPLY: 796 if (code != 0) 797 goto badcode; 798 break; 799 800 case ND_ROUTER_SOLICIT: 801 icmp6_ifstat_inc(rcvif, ifs6_in_routersolicit); 802 if (code != 0) 803 goto badcode; 804 if (icmp6len < sizeof(struct nd_router_solicit)) 805 goto badlen; 806 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 807 /* give up local */ 808 nd6_rs_input(m, off, icmp6len); 809 m = NULL; 810 goto freeit; 811 } 812 nd6_rs_input(n, off, icmp6len); 813 /* m stays. */ 814 break; 815 816 case ND_ROUTER_ADVERT: 817 icmp6_ifstat_inc(rcvif, ifs6_in_routeradvert); 818 if (code != 0) 819 goto badcode; 820 if (icmp6len < sizeof(struct nd_router_advert)) 821 goto badlen; 822 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 823 /* give up local */ 824 nd6_ra_input(m, off, icmp6len); 825 m = NULL; 826 goto freeit; 827 } 828 nd6_ra_input(n, off, icmp6len); 829 /* m stays. */ 830 break; 831 832 case ND_NEIGHBOR_SOLICIT: 833 icmp6_ifstat_inc(rcvif, ifs6_in_neighborsolicit); 834 if (code != 0) 835 goto badcode; 836 if (icmp6len < sizeof(struct nd_neighbor_solicit)) 837 goto badlen; 838 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 839 /* give up local */ 840 nd6_ns_input(m, off, icmp6len); 841 m = NULL; 842 goto freeit; 843 } 844 nd6_ns_input(n, off, icmp6len); 845 /* m stays. */ 846 break; 847 848 case ND_NEIGHBOR_ADVERT: 849 icmp6_ifstat_inc(rcvif, ifs6_in_neighboradvert); 850 if (code != 0) 851 goto badcode; 852 if (icmp6len < sizeof(struct nd_neighbor_advert)) 853 goto badlen; 854 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 855 /* give up local */ 856 nd6_na_input(m, off, icmp6len); 857 m = NULL; 858 goto freeit; 859 } 860 nd6_na_input(n, off, icmp6len); 861 /* m stays. */ 862 break; 863 864 case ND_REDIRECT: 865 icmp6_ifstat_inc(rcvif, ifs6_in_redirect); 866 if (code != 0) 867 goto badcode; 868 if (icmp6len < sizeof(struct nd_redirect)) 869 goto badlen; 870 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 871 /* give up local */ 872 icmp6_redirect_input(m, off); 873 m = NULL; 874 goto freeit; 875 } 876 icmp6_redirect_input(n, off); 877 /* m stays. */ 878 break; 879 880 case ICMP6_ROUTER_RENUMBERING: 881 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND && 882 code != ICMP6_ROUTER_RENUMBERING_RESULT) 883 goto badcode; 884 if (icmp6len < sizeof(struct icmp6_router_renum)) 885 goto badlen; 886 break; 887 888 default: 889 nd6log(LOG_DEBUG, 890 "unknown type %d(src=%s, dst=%s, ifid=%d)\n", 891 icmp6->icmp6_type, 892 IN6_PRINT(ip6buf, &ip6->ip6_src), 893 IN6_PRINT(ip6buf2, &ip6->ip6_dst), 894 rcvif ? rcvif->if_index : 0); 895 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) { 896 /* ICMPv6 error: MUST deliver it by spec... */ 897 code = PRC_NCMDS; 898 /* deliver */ 899 } else { 900 /* ICMPv6 informational: MUST not deliver */ 901 break; 902 } 903 deliver: 904 if (icmp6_notify_error(m, off, icmp6len, code)) { 905 /* In this case, m should've been freed. */ 906 m_put_rcvif_psref(rcvif, &psref); 907 return; 908 } 909 break; 910 911 badcode: 912 ICMP6_STATINC(ICMP6_STAT_BADCODE); 913 break; 914 915 badlen: 916 ICMP6_STATINC(ICMP6_STAT_BADLEN); 917 break; 918 } 919 m_put_rcvif_psref(rcvif, &psref); 920 921 /* deliver the packet to appropriate sockets */ 922 icmp6_rip6_input(&m, off); 923 924 return; 925 926 freeit: 927 m_put_rcvif_psref(rcvif, &psref); 928 m_freem(m); 929 return; 930} 931 932int 933icmp6_input(struct mbuf **mp, int *offp, int proto) 934{ 935 936 wqinput_input(icmp6_wqinput, *mp, *offp, proto); 937 938 return IPPROTO_DONE; 939} 940 941static int 942icmp6_notify_error(struct mbuf *m, int off, int icmp6len, int code) 943{ 944 struct icmp6_hdr *icmp6; 945 struct ip6_hdr *eip6; 946 u_int32_t notifymtu; 947 struct sockaddr_in6 icmp6src, icmp6dst; 948 949 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) { 950 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 951 goto freeit; 952 } 953 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 954 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 955 if (icmp6 == NULL) { 956 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 957 return (-1); 958 } 959 eip6 = (struct ip6_hdr *)(icmp6 + 1); 960 961 /* Detect the upper level protocol */ 962 { 963 void (*ctlfunc)(int, struct sockaddr *, void *); 964 u_int8_t nxt = eip6->ip6_nxt; 965 int eoff = off + sizeof(struct icmp6_hdr) + 966 sizeof(struct ip6_hdr); 967 struct ip6ctlparam ip6cp; 968 struct in6_addr *finaldst = NULL; 969 int icmp6type = icmp6->icmp6_type; 970 struct ip6_frag *fh; 971 struct ip6_rthdr *rth; 972 struct ip6_rthdr0 *rth0; 973 int rthlen; 974 struct ifnet *rcvif; 975 int s; 976 977 while (1) { /* XXX: should avoid infinite loop explicitly? */ 978 struct ip6_ext *eh; 979 980 switch (nxt) { 981 case IPPROTO_HOPOPTS: 982 case IPPROTO_DSTOPTS: 983 case IPPROTO_AH: 984 IP6_EXTHDR_GET(eh, struct ip6_ext *, m, 985 eoff, sizeof(*eh)); 986 if (eh == NULL) { 987 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 988 return (-1); 989 } 990 991 if (nxt == IPPROTO_AH) 992 eoff += (eh->ip6e_len + 2) << 2; 993 else 994 eoff += (eh->ip6e_len + 1) << 3; 995 nxt = eh->ip6e_nxt; 996 break; 997 case IPPROTO_ROUTING: 998 /* 999 * When the erroneous packet contains a 1000 * routing header, we should examine the 1001 * header to determine the final destination. 1002 * Otherwise, we can't properly update 1003 * information that depends on the final 1004 * destination (e.g. path MTU). 1005 */ 1006 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m, 1007 eoff, sizeof(*rth)); 1008 if (rth == NULL) { 1009 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 1010 return (-1); 1011 } 1012 rthlen = (rth->ip6r_len + 1) << 3; 1013 /* 1014 * XXX: currently there is no 1015 * officially defined type other 1016 * than type-0. 1017 * Note that if the segment left field 1018 * is 0, all intermediate hops must 1019 * have been passed. 1020 */ 1021 if (rth->ip6r_segleft && 1022 rth->ip6r_type == IPV6_RTHDR_TYPE_0) { 1023 int hops; 1024 1025 IP6_EXTHDR_GET(rth0, 1026 struct ip6_rthdr0 *, m, 1027 eoff, rthlen); 1028 if (rth0 == NULL) { 1029 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 1030 return (-1); 1031 } 1032 /* just ignore a bogus header */ 1033 if ((rth0->ip6r0_len % 2) == 0 && 1034 (hops = rth0->ip6r0_len/2)) 1035 finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1); 1036 } 1037 eoff += rthlen; 1038 nxt = rth->ip6r_nxt; 1039 break; 1040 case IPPROTO_FRAGMENT: 1041 IP6_EXTHDR_GET(fh, struct ip6_frag *, m, 1042 eoff, sizeof(*fh)); 1043 if (fh == NULL) { 1044 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 1045 return (-1); 1046 } 1047 /* 1048 * Data after a fragment header is meaningless 1049 * unless it is the first fragment, but 1050 * we'll go to the notify label for path MTU 1051 * discovery. 1052 */ 1053 if (fh->ip6f_offlg & IP6F_OFF_MASK) 1054 goto notify; 1055 1056 eoff += sizeof(struct ip6_frag); 1057 nxt = fh->ip6f_nxt; 1058 break; 1059 default: 1060 /* 1061 * This case includes ESP and the No Next 1062 * Header. In such cases going to the notify 1063 * label does not have any meaning 1064 * (i.e. ctlfunc will be NULL), but we go 1065 * anyway since we might have to update 1066 * path MTU information. 1067 */ 1068 goto notify; 1069 } 1070 } 1071 notify: 1072 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 1073 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 1074 if (icmp6 == NULL) { 1075 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 1076 return (-1); 1077 } 1078 1079 /* 1080 * retrieve parameters from the inner IPv6 header, and convert 1081 * them into sockaddr structures. 1082 * XXX: there is no guarantee that the source or destination 1083 * addresses of the inner packet are in the same scope zone as 1084 * the addresses of the icmp packet. But there is no other 1085 * way to determine the zone. 1086 */ 1087 eip6 = (struct ip6_hdr *)(icmp6 + 1); 1088 1089 rcvif = m_get_rcvif(m, &s); 1090 if (__predict_false(rcvif == NULL)) 1091 goto freeit; 1092 sockaddr_in6_init(&icmp6dst, 1093 (finaldst == NULL) ? &eip6->ip6_dst : finaldst, 0, 0, 0); 1094 if (in6_setscope(&icmp6dst.sin6_addr, rcvif, NULL)) { 1095 m_put_rcvif(rcvif, &s); 1096 goto freeit; 1097 } 1098 sockaddr_in6_init(&icmp6src, &eip6->ip6_src, 0, 0, 0); 1099 if (in6_setscope(&icmp6src.sin6_addr, rcvif, NULL)) { 1100 m_put_rcvif(rcvif, &s); 1101 goto freeit; 1102 } 1103 m_put_rcvif(rcvif, &s); 1104 1105 icmp6src.sin6_flowinfo = 1106 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK); 1107 1108 if (finaldst == NULL) 1109 finaldst = &eip6->ip6_dst; 1110 ip6cp.ip6c_m = m; 1111 ip6cp.ip6c_icmp6 = icmp6; 1112 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1); 1113 ip6cp.ip6c_off = eoff; 1114 ip6cp.ip6c_finaldst = finaldst; 1115 ip6cp.ip6c_src = &icmp6src; 1116 ip6cp.ip6c_nxt = nxt; 1117 1118 if (icmp6type == ICMP6_PACKET_TOO_BIG) { 1119 notifymtu = ntohl(icmp6->icmp6_mtu); 1120 ip6cp.ip6c_cmdarg = (void *)¬ifymtu; 1121 } 1122 1123 ctlfunc = (void (*)(int, struct sockaddr *, void *)) 1124 (inet6sw[ip6_protox[nxt]].pr_ctlinput); 1125 if (ctlfunc) { 1126 (void)(*ctlfunc)(code, sin6tosa(&icmp6dst), 1127 &ip6cp); 1128 } 1129 } 1130 return (0); 1131 1132 freeit: 1133 m_freem(m); 1134 return (-1); 1135} 1136 1137void 1138icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated) 1139{ 1140 unsigned long rtcount; 1141 struct icmp6_mtudisc_callback *mc; 1142 struct in6_addr *dst = ip6cp->ip6c_finaldst; 1143 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6; 1144 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */ 1145 u_int mtu = ntohl(icmp6->icmp6_mtu); 1146 struct rtentry *rt = NULL; 1147 struct sockaddr_in6 sin6; 1148 struct ifnet *rcvif; 1149 int s; 1150 1151 /* 1152 * The MTU should not be less than the minimal IPv6 MTU except for the 1153 * hack in ip6_output/ip6_setpmtu where we always include a frag header. 1154 * In that one case, the MTU might be less than 1280. 1155 */ 1156 if (__predict_false(mtu < IPV6_MMTU - sizeof(struct ip6_frag))) { 1157 /* is the mtu even sane? */ 1158 if (mtu < sizeof(struct ip6_hdr) + sizeof(struct ip6_frag) + 8) 1159 return; 1160 if (!validated) 1161 return; 1162 mtu = IPV6_MMTU - sizeof(struct ip6_frag); 1163 } 1164 1165 /* 1166 * allow non-validated cases if memory is plenty, to make traffic 1167 * from non-connected pcb happy. 1168 */ 1169 mutex_enter(&icmp6_mtx); 1170 rtcount = rt_timer_count(icmp6_mtudisc_timeout_q); 1171 if (validated) { 1172 if (0 <= icmp6_mtudisc_hiwat && rtcount > icmp6_mtudisc_hiwat) { 1173 mutex_exit(&icmp6_mtx); 1174 return; 1175 } else if (0 <= icmp6_mtudisc_lowat && 1176 rtcount > icmp6_mtudisc_lowat) { 1177 /* 1178 * XXX nuke a victim, install the new one. 1179 */ 1180 } 1181 } else { 1182 if (0 <= icmp6_mtudisc_lowat && rtcount > icmp6_mtudisc_lowat) { 1183 mutex_exit(&icmp6_mtx); 1184 return; 1185 } 1186 } 1187 mutex_exit(&icmp6_mtx); 1188 1189 memset(&sin6, 0, sizeof(sin6)); 1190 sin6.sin6_family = PF_INET6; 1191 sin6.sin6_len = sizeof(struct sockaddr_in6); 1192 sin6.sin6_addr = *dst; 1193 rcvif = m_get_rcvif(m, &s); 1194 if (__predict_false(rcvif == NULL)) 1195 return; 1196 if (in6_setscope(&sin6.sin6_addr, rcvif, NULL)) { 1197 m_put_rcvif(rcvif, &s); 1198 return; 1199 } 1200 m_put_rcvif(rcvif, &s); 1201 1202 rt = icmp6_mtudisc_clone(sin6tosa(&sin6)); 1203 1204 if (rt && (rt->rt_flags & RTF_HOST) && 1205 !(rt->rt_rmx.rmx_locks & RTV_MTU) && 1206 (rt->rt_rmx.rmx_mtu > mtu || rt->rt_rmx.rmx_mtu == 0)) { 1207 if (mtu < IN6_LINKMTU(rt->rt_ifp)) { 1208 ICMP6_STATINC(ICMP6_STAT_PMTUCHG); 1209 rt->rt_rmx.rmx_mtu = mtu; 1210 } 1211 } 1212 if (rt) { 1213 rt_unref(rt); 1214 } 1215 1216 /* 1217 * Notify protocols that the MTU for this destination 1218 * has changed. 1219 */ 1220 mutex_enter(&icmp6_mtx); 1221 for (mc = LIST_FIRST(&icmp6_mtudisc_callbacks); mc != NULL; 1222 mc = LIST_NEXT(mc, mc_list)) 1223 (*mc->mc_func)(&sin6.sin6_addr); 1224 mutex_exit(&icmp6_mtx); 1225} 1226 1227/* 1228 * Process a Node Information Query packet, based on 1229 * draft-ietf-ipngwg-icmp-name-lookups-07. 1230 * 1231 * Spec incompatibilities: 1232 * - IPv6 Subject address handling 1233 * - IPv4 Subject address handling support missing 1234 * - Proxy reply (answer even if it's not for me) 1235 * - joins NI group address at in6_ifattach() time only, does not cope 1236 * with hostname changes by sethostname(3) 1237 */ 1238static struct mbuf * 1239ni6_input(struct mbuf *m, int off) 1240{ 1241 struct icmp6_nodeinfo *ni6, *nni6; 1242 struct mbuf *n = NULL; 1243 u_int16_t qtype; 1244 int subjlen; 1245 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1246 struct ni_reply_fqdn *fqdn; 1247 int addrs; /* for NI_QTYPE_NODEADDR */ 1248 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */ 1249 struct sockaddr_in6 sin6; /* ip6_dst */ 1250 struct in6_addr in6_subj; /* subject address */ 1251 struct ip6_hdr *ip6; 1252 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */ 1253 char *subj = NULL; 1254 struct ifnet *rcvif; 1255 int s, ss; 1256 struct ifaddr *ifa; 1257 struct psref psref; 1258 1259 ip6 = mtod(m, struct ip6_hdr *); 1260 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6)); 1261 if (ni6 == NULL) { 1262 /* m is already reclaimed */ 1263 return NULL; 1264 } 1265 1266 /* 1267 * Validate IPv6 destination address. 1268 * 1269 * The Responder must discard the Query without further processing 1270 * unless it is one of the Responder's unicast or anycast addresses, or 1271 * a link-local scope multicast address which the Responder has joined. 1272 * [icmp-name-lookups-07, Section 4.] 1273 */ 1274 sockaddr_in6_init(&sin6, &ip6->ip6_dst, 0, 0, 0); 1275 /* XXX scopeid */ 1276 ss = pserialize_read_enter(); 1277 ifa = ifa_ifwithaddr(sin6tosa(&sin6)); 1278 if (ifa != NULL) 1279 ; /* unicast/anycast, fine */ 1280 else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr)) 1281 ; /* link-local multicast, fine */ 1282 else { 1283 pserialize_read_exit(ss); 1284 goto bad; 1285 } 1286 pserialize_read_exit(ss); 1287 1288 /* validate query Subject field. */ 1289 qtype = ntohs(ni6->ni_qtype); 1290 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo); 1291 switch (qtype) { 1292 case NI_QTYPE_NOOP: 1293 case NI_QTYPE_SUPTYPES: 1294 /* 07 draft */ 1295 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0) 1296 break; 1297 /* FALLTHROUGH */ 1298 case NI_QTYPE_FQDN: 1299 case NI_QTYPE_NODEADDR: 1300 case NI_QTYPE_IPV4ADDR: 1301 switch (ni6->ni_code) { 1302 case ICMP6_NI_SUBJ_IPV6: 1303#if ICMP6_NI_SUBJ_IPV6 != 0 1304 case 0: 1305#endif 1306 /* 1307 * backward compatibility - try to accept 03 draft 1308 * format, where no Subject is present. 1309 */ 1310 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 && 1311 subjlen == 0) { 1312 oldfqdn++; 1313 break; 1314 } 1315#if ICMP6_NI_SUBJ_IPV6 != 0 1316 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6) 1317 goto bad; 1318#endif 1319 1320 if (subjlen != sizeof(sin6.sin6_addr)) 1321 goto bad; 1322 1323 /* 1324 * Validate Subject address. 1325 * 1326 * Not sure what exactly "address belongs to the node" 1327 * means in the spec, is it just unicast, or what? 1328 * 1329 * At this moment we consider Subject address as 1330 * "belong to the node" if the Subject address equals 1331 * to the IPv6 destination address; validation for 1332 * IPv6 destination address should have done enough 1333 * check for us. 1334 * 1335 * We do not do proxy at this moment. 1336 */ 1337 /* m_pulldown instead of copy? */ 1338 m_copydata(m, off + sizeof(struct icmp6_nodeinfo), 1339 subjlen, (void *)&in6_subj); 1340 rcvif = m_get_rcvif(m, &s); 1341 if (__predict_false(rcvif == NULL)) 1342 goto bad; 1343 if (in6_setscope(&in6_subj, rcvif, NULL)) { 1344 m_put_rcvif(rcvif, &s); 1345 goto bad; 1346 } 1347 m_put_rcvif(rcvif, &s); 1348 1349 subj = (char *)&in6_subj; 1350 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &in6_subj)) 1351 break; 1352 1353 /* 1354 * XXX if we are to allow other cases, we should really 1355 * be careful about scope here. 1356 * basically, we should disallow queries toward IPv6 1357 * destination X with subject Y, if scope(X) > scope(Y). 1358 * if we allow scope(X) > scope(Y), it will result in 1359 * information leakage across scope boundary. 1360 */ 1361 goto bad; 1362 1363 case ICMP6_NI_SUBJ_FQDN: 1364 /* 1365 * Validate Subject name with gethostname(3). 1366 * 1367 * The behavior may need some debate, since: 1368 * - we are not sure if the node has FQDN as 1369 * hostname (returned by gethostname(3)). 1370 * - the code does wildcard match for truncated names. 1371 * however, we are not sure if we want to perform 1372 * wildcard match, if gethostname(3) side has 1373 * truncated hostname. 1374 */ 1375 n = ni6_nametodns(hostname, hostnamelen, 0); 1376 if (!n || n->m_next || n->m_len == 0) 1377 goto bad; 1378 IP6_EXTHDR_GET(subj, char *, m, 1379 off + sizeof(struct icmp6_nodeinfo), subjlen); 1380 if (subj == NULL) 1381 goto bad; 1382 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *), 1383 n->m_len)) { 1384 goto bad; 1385 } 1386 m_freem(n); 1387 n = NULL; 1388 break; 1389 1390 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */ 1391 default: 1392 goto bad; 1393 } 1394 break; 1395 } 1396 1397 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */ 1398 switch (qtype) { 1399 case NI_QTYPE_FQDN: 1400 if ((icmp6_nodeinfo & 1) == 0) 1401 goto bad; 1402 break; 1403 case NI_QTYPE_NODEADDR: 1404 case NI_QTYPE_IPV4ADDR: 1405 if ((icmp6_nodeinfo & 2) == 0) 1406 goto bad; 1407 break; 1408 } 1409 1410 /* guess reply length */ 1411 switch (qtype) { 1412 case NI_QTYPE_NOOP: 1413 break; /* no reply data */ 1414 case NI_QTYPE_SUPTYPES: 1415 replylen += sizeof(u_int32_t); 1416 break; 1417 case NI_QTYPE_FQDN: 1418 /* XXX will append an mbuf */ 1419 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1420 break; 1421 case NI_QTYPE_NODEADDR: 1422 addrs = ni6_addrs(ni6, m, &ifp, subj, &psref); 1423 if ((replylen += addrs * (sizeof(struct in6_addr) + 1424 sizeof(u_int32_t))) > MCLBYTES) 1425 replylen = MCLBYTES; /* XXX: will truncate pkt later */ 1426 break; 1427 case NI_QTYPE_IPV4ADDR: 1428 /* unsupported - should respond with unknown Qtype? */ 1429 goto bad; 1430 default: 1431 /* 1432 * XXX: We must return a reply with the ICMP6 code 1433 * `unknown Qtype' in this case. However we regard the case 1434 * as an FQDN query for backward compatibility. 1435 * Older versions set a random value to this field, 1436 * so it rarely varies in the defined qtypes. 1437 * But the mechanism is not reliable... 1438 * maybe we should obsolete older versions. 1439 */ 1440 qtype = NI_QTYPE_FQDN; 1441 /* XXX will append an mbuf */ 1442 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1443 oldfqdn++; 1444 break; 1445 } 1446 1447 /* allocate an mbuf to reply. */ 1448 MGETHDR(n, M_DONTWAIT, m->m_type); 1449 if (n == NULL) { 1450 if_put(ifp, &psref); 1451 m_freem(m); 1452 return (NULL); 1453 } 1454 M_MOVE_PKTHDR(n, m); /* just for rcvif */ 1455 if (replylen > MHLEN) { 1456 if (replylen > MCLBYTES) { 1457 /* 1458 * XXX: should we try to allocate more? But MCLBYTES 1459 * is probably much larger than IPV6_MMTU... 1460 */ 1461 goto bad; 1462 } 1463 MCLGET(n, M_DONTWAIT); 1464 if ((n->m_flags & M_EXT) == 0) { 1465 goto bad; 1466 } 1467 } 1468 n->m_pkthdr.len = n->m_len = replylen; 1469 1470 /* copy mbuf header and IPv6 + Node Information base headers */ 1471 bcopy(mtod(m, void *), mtod(n, void *), sizeof(struct ip6_hdr)); 1472 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1); 1473 bcopy((void *)ni6, (void *)nni6, sizeof(struct icmp6_nodeinfo)); 1474 1475 /* qtype dependent procedure */ 1476 switch (qtype) { 1477 case NI_QTYPE_NOOP: 1478 nni6->ni_code = ICMP6_NI_SUCCESS; 1479 nni6->ni_flags = 0; 1480 break; 1481 case NI_QTYPE_SUPTYPES: 1482 { 1483 u_int32_t v; 1484 nni6->ni_code = ICMP6_NI_SUCCESS; 1485 nni6->ni_flags = htons(0x0000); /* raw bitmap */ 1486 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */ 1487 v = (u_int32_t)htonl(0x0000000f); 1488 bcopy(&v, nni6 + 1, sizeof(u_int32_t)); 1489 break; 1490 } 1491 case NI_QTYPE_FQDN: 1492 nni6->ni_code = ICMP6_NI_SUCCESS; 1493 fqdn = (struct ni_reply_fqdn *)(mtod(n, char *) + 1494 sizeof(struct ip6_hdr) + 1495 sizeof(struct icmp6_nodeinfo)); 1496 nni6->ni_flags = 0; /* XXX: meaningless TTL */ 1497 fqdn->ni_fqdn_ttl = 0; /* ditto. */ 1498 /* 1499 * XXX do we really have FQDN in variable "hostname"? 1500 */ 1501 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn); 1502 if (n->m_next == NULL) 1503 goto bad; 1504 /* XXX we assume that n->m_next is not a chain */ 1505 if (n->m_next->m_next != NULL) 1506 goto bad; 1507 n->m_pkthdr.len += n->m_next->m_len; 1508 break; 1509 case NI_QTYPE_NODEADDR: 1510 { 1511 int lenlim, copied; 1512 1513 nni6->ni_code = ICMP6_NI_SUCCESS; 1514 n->m_pkthdr.len = n->m_len = 1515 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1516 lenlim = M_TRAILINGSPACE(n); 1517 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim); 1518 if_put(ifp, &psref); 1519 ifp = NULL; 1520 /* XXX: reset mbuf length */ 1521 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 1522 sizeof(struct icmp6_nodeinfo) + copied; 1523 break; 1524 } 1525 default: 1526 break; /* XXX impossible! */ 1527 } 1528 1529 nni6->ni_type = ICMP6_NI_REPLY; 1530 m_freem(m); 1531 return (n); 1532 1533 bad: 1534 if_put(ifp, &psref); 1535 m_freem(m); 1536 if (n) 1537 m_freem(n); 1538 return (NULL); 1539} 1540#undef hostnamelen 1541 1542#define isupper(x) ('A' <= (x) && (x) <= 'Z') 1543#define isalpha(x) (('A' <= (x) && (x) <= 'Z') || ('a' <= (x) && (x) <= 'z')) 1544#define isalnum(x) (isalpha(x) || ('0' <= (x) && (x) <= '9')) 1545#define tolower(x) (isupper(x) ? (x) + 'a' - 'A' : (x)) 1546 1547/* 1548 * make a mbuf with DNS-encoded string. no compression support. 1549 * 1550 * XXX names with less than 2 dots (like "foo" or "foo.section") will be 1551 * treated as truncated name (two \0 at the end). this is a wild guess. 1552 * 1553 * old - return pascal string if non-zero 1554 */ 1555static struct mbuf * 1556ni6_nametodns(const char *name, int namelen, int old) 1557{ 1558 struct mbuf *m; 1559 char *cp, *ep; 1560 const char *p, *q; 1561 int i, len, nterm; 1562 1563 if (old) 1564 len = namelen + 1; 1565 else 1566 len = MCLBYTES; 1567 1568 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */ 1569 MGET(m, M_DONTWAIT, MT_DATA); 1570 if (m && len > MLEN) { 1571 MCLGET(m, M_DONTWAIT); 1572 if ((m->m_flags & M_EXT) == 0) 1573 goto fail; 1574 } 1575 if (!m) 1576 goto fail; 1577 m->m_next = NULL; 1578 1579 if (old) { 1580 m->m_len = len; 1581 *mtod(m, char *) = namelen; 1582 bcopy(name, mtod(m, char *) + 1, namelen); 1583 return m; 1584 } else { 1585 m->m_len = 0; 1586 cp = mtod(m, char *); 1587 ep = mtod(m, char *) + M_TRAILINGSPACE(m); 1588 1589 /* if not certain about my name, return empty buffer */ 1590 if (namelen == 0) 1591 return m; 1592 1593 /* 1594 * guess if it looks like shortened hostname, or FQDN. 1595 * shortened hostname needs two trailing "\0". 1596 */ 1597 i = 0; 1598 for (p = name; p < name + namelen; p++) { 1599 if (*p == '.') 1600 i++; 1601 } 1602 if (i < 2) 1603 nterm = 2; 1604 else 1605 nterm = 1; 1606 1607 p = name; 1608 while (cp < ep && p < name + namelen) { 1609 i = 0; 1610 for (q = p; q < name + namelen && *q && *q != '.'; q++) 1611 i++; 1612 /* result does not fit into mbuf */ 1613 if (cp + i + 1 >= ep) 1614 goto fail; 1615 /* 1616 * DNS label length restriction, RFC1035 page 8. 1617 * "i == 0" case is included here to avoid returning 1618 * 0-length label on "foo..bar". 1619 */ 1620 if (i <= 0 || i >= 64) 1621 goto fail; 1622 *cp++ = i; 1623 if (!isalpha(p[0]) || !isalnum(p[i - 1])) 1624 goto fail; 1625 while (i > 0) { 1626 if (!isalnum(*p) && *p != '-') 1627 goto fail; 1628 if (isupper(*p)) { 1629 *cp++ = tolower(*p); 1630 p++; 1631 } else 1632 *cp++ = *p++; 1633 i--; 1634 } 1635 p = q; 1636 if (p < name + namelen && *p == '.') 1637 p++; 1638 } 1639 /* termination */ 1640 if (cp + nterm >= ep) 1641 goto fail; 1642 while (nterm-- > 0) 1643 *cp++ = '\0'; 1644 m->m_len = cp - mtod(m, char *); 1645 return m; 1646 } 1647 1648 panic("should not reach here"); 1649 /* NOTREACHED */ 1650 1651 fail: 1652 if (m) 1653 m_freem(m); 1654 return NULL; 1655} 1656 1657/* 1658 * check if two DNS-encoded string matches. takes care of truncated 1659 * form (with \0\0 at the end). no compression support. 1660 * XXX upper/lowercase match (see RFC2065) 1661 */ 1662static int 1663ni6_dnsmatch(const char *a, int alen, const char *b, int blen) 1664{ 1665 const char *a0, *b0; 1666 int l; 1667 1668 /* simplest case - need validation? */ 1669 if (alen == blen && memcmp(a, b, alen) == 0) 1670 return 1; 1671 1672 a0 = a; 1673 b0 = b; 1674 1675 /* termination is mandatory */ 1676 if (alen < 2 || blen < 2) 1677 return 0; 1678 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0') 1679 return 0; 1680 alen--; 1681 blen--; 1682 1683 while (a - a0 < alen && b - b0 < blen) { 1684 if (a - a0 + 1 > alen || b - b0 + 1 > blen) 1685 return 0; 1686 1687 if ((signed char)a[0] < 0 || (signed char)b[0] < 0) 1688 return 0; 1689 /* we don't support compression yet */ 1690 if (a[0] >= 64 || b[0] >= 64) 1691 return 0; 1692 1693 /* truncated case */ 1694 if (a[0] == 0 && a - a0 == alen - 1) 1695 return 1; 1696 if (b[0] == 0 && b - b0 == blen - 1) 1697 return 1; 1698 if (a[0] == 0 || b[0] == 0) 1699 return 0; 1700 1701 if (a[0] != b[0]) 1702 return 0; 1703 l = a[0]; 1704 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen) 1705 return 0; 1706 if (memcmp(a + 1, b + 1, l) != 0) 1707 return 0; 1708 1709 a += 1 + l; 1710 b += 1 + l; 1711 } 1712 1713 if (a - a0 == alen && b - b0 == blen) 1714 return 1; 1715 else 1716 return 0; 1717} 1718 1719/* 1720 * calculate the number of addresses to be returned in the node info reply. 1721 */ 1722static int 1723ni6_addrs(struct icmp6_nodeinfo *ni6, struct mbuf *m, 1724 struct ifnet **ifpp, char *subj, struct psref *psref) 1725{ 1726 struct ifnet *ifp; 1727 struct in6_ifaddr *ia6; 1728 struct ifaddr *ifa; 1729 struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */ 1730 int addrs = 0, addrsofif, iffound = 0; 1731 int niflags = ni6->ni_flags; 1732 int s; 1733 1734 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) { 1735 switch (ni6->ni_code) { 1736 case ICMP6_NI_SUBJ_IPV6: 1737 if (subj == NULL) /* must be impossible... */ 1738 return (0); 1739 subj_ip6 = (struct sockaddr_in6 *)subj; 1740 break; 1741 default: 1742 /* 1743 * XXX: we only support IPv6 subject address for 1744 * this Qtype. 1745 */ 1746 return (0); 1747 } 1748 } 1749 1750 s = pserialize_read_enter(); 1751 IFNET_READER_FOREACH(ifp) { 1752 addrsofif = 0; 1753 IFADDR_READER_FOREACH(ifa, ifp) { 1754 if (ifa->ifa_addr->sa_family != AF_INET6) 1755 continue; 1756 ia6 = (struct in6_ifaddr *)ifa; 1757 1758 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 && 1759 IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr, 1760 &ia6->ia_addr.sin6_addr)) 1761 iffound = 1; 1762 1763 /* 1764 * IPv4-mapped addresses can only be returned by a 1765 * Node Information proxy, since they represent 1766 * addresses of IPv4-only nodes, which perforce do 1767 * not implement this protocol. 1768 * [icmp-name-lookups-07, Section 5.4] 1769 * So we don't support NI_NODEADDR_FLAG_COMPAT in 1770 * this function at this moment. 1771 */ 1772 1773 /* What do we have to do about ::1? */ 1774 switch (in6_addrscope(&ia6->ia_addr.sin6_addr)) { 1775 case IPV6_ADDR_SCOPE_LINKLOCAL: 1776 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1777 continue; 1778 break; 1779 case IPV6_ADDR_SCOPE_SITELOCAL: 1780 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1781 continue; 1782 break; 1783 case IPV6_ADDR_SCOPE_GLOBAL: 1784 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1785 continue; 1786 break; 1787 default: 1788 continue; 1789 } 1790 1791 /* 1792 * check if anycast is okay. 1793 * XXX: just experimental. not in the spec. 1794 */ 1795 if ((ia6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1796 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 1797 continue; /* we need only unicast addresses */ 1798 1799 addrsofif++; /* count the address */ 1800 } 1801 if (iffound) { 1802 if_acquire(ifp, psref); 1803 pserialize_read_exit(s); 1804 *ifpp = ifp; 1805 return (addrsofif); 1806 } 1807 1808 addrs += addrsofif; 1809 } 1810 pserialize_read_exit(s); 1811 1812 return (addrs); 1813} 1814 1815static int 1816ni6_store_addrs(struct icmp6_nodeinfo *ni6, 1817 struct icmp6_nodeinfo *nni6, struct ifnet *ifp0, 1818 int resid) 1819{ 1820 struct ifnet *ifp; 1821 struct in6_ifaddr *ia6; 1822 struct ifaddr *ifa; 1823 struct ifnet *ifp_dep = NULL; 1824 int copied = 0, allow_deprecated = 0; 1825 u_char *cp = (u_char *)(nni6 + 1); 1826 int niflags = ni6->ni_flags; 1827 u_int32_t ltime; 1828 int s; 1829 1830 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL)) 1831 return (0); /* needless to copy */ 1832 1833 s = pserialize_read_enter(); 1834 ifp = ifp0 ? ifp0 : IFNET_READER_FIRST(); 1835 again: 1836 1837 for (; ifp; ifp = IFNET_READER_NEXT(ifp)) 1838 { 1839 IFADDR_READER_FOREACH(ifa, ifp) { 1840 if (ifa->ifa_addr->sa_family != AF_INET6) 1841 continue; 1842 ia6 = (struct in6_ifaddr *)ifa; 1843 1844 if ((ia6->ia6_flags & IN6_IFF_DEPRECATED) != 0 && 1845 allow_deprecated == 0) { 1846 /* 1847 * prefererred address should be put before 1848 * deprecated addresses. 1849 */ 1850 1851 /* record the interface for later search */ 1852 if (ifp_dep == NULL) 1853 ifp_dep = ifp; 1854 1855 continue; 1856 } 1857 else if ((ia6->ia6_flags & IN6_IFF_DEPRECATED) == 0 && 1858 allow_deprecated != 0) 1859 continue; /* we now collect deprecated addrs */ 1860 1861 /* What do we have to do about ::1? */ 1862 switch (in6_addrscope(&ia6->ia_addr.sin6_addr)) { 1863 case IPV6_ADDR_SCOPE_LINKLOCAL: 1864 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1865 continue; 1866 break; 1867 case IPV6_ADDR_SCOPE_SITELOCAL: 1868 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1869 continue; 1870 break; 1871 case IPV6_ADDR_SCOPE_GLOBAL: 1872 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1873 continue; 1874 break; 1875 default: 1876 continue; 1877 } 1878 1879 /* 1880 * check if anycast is okay. 1881 * XXX: just experimental. not in the spec. 1882 */ 1883 if ((ia6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1884 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 1885 continue; 1886 1887 /* now we can copy the address */ 1888 if (resid < sizeof(struct in6_addr) + 1889 sizeof(u_int32_t)) { 1890 /* 1891 * We give up much more copy. 1892 * Set the truncate flag and return. 1893 */ 1894 nni6->ni_flags |= NI_NODEADDR_FLAG_TRUNCATE; 1895 goto out; 1896 } 1897 1898 /* 1899 * Set the TTL of the address. 1900 * The TTL value should be one of the following 1901 * according to the specification: 1902 * 1903 * 1. The remaining lifetime of a DHCP lease on the 1904 * address, or 1905 * 2. The remaining Valid Lifetime of a prefix from 1906 * which the address was derived through Stateless 1907 * Autoconfiguration. 1908 * 1909 * Note that we currently do not support stateful 1910 * address configuration by DHCPv6, so the former 1911 * case can't happen. 1912 * 1913 * TTL must be 2^31 > TTL >= 0. 1914 */ 1915 if (ia6->ia6_lifetime.ia6t_expire == 0) 1916 ltime = ND6_INFINITE_LIFETIME; 1917 else { 1918 if (ia6->ia6_lifetime.ia6t_expire > 1919 time_uptime) 1920 ltime = ia6->ia6_lifetime.ia6t_expire - 1921 time_uptime; 1922 else 1923 ltime = 0; 1924 } 1925 if (ltime > 0x7fffffff) 1926 ltime = 0x7fffffff; 1927 ltime = htonl(ltime); 1928 1929 bcopy(<ime, cp, sizeof(u_int32_t)); 1930 cp += sizeof(u_int32_t); 1931 1932 /* copy the address itself */ 1933 bcopy(&ia6->ia_addr.sin6_addr, cp, 1934 sizeof(struct in6_addr)); 1935 in6_clearscope((struct in6_addr *)cp); /* XXX */ 1936 cp += sizeof(struct in6_addr); 1937 1938 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1939 copied += (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1940 } 1941 if (ifp0) /* we need search only on the specified IF */ 1942 break; 1943 } 1944 1945 if (allow_deprecated == 0 && ifp_dep != NULL) { 1946 ifp = ifp_dep; 1947 allow_deprecated = 1; 1948 1949 goto again; 1950 } 1951out: 1952 pserialize_read_exit(s); 1953 return (copied); 1954} 1955 1956/* 1957 * XXX almost dup'ed code with rip6_input. 1958 */ 1959static int 1960icmp6_rip6_input(struct mbuf **mp, int off) 1961{ 1962 struct mbuf *m = *mp; 1963 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1964 struct inpcb_hdr *inph; 1965 struct in6pcb *in6p; 1966 struct in6pcb *last = NULL; 1967 struct sockaddr_in6 rip6src; 1968 struct icmp6_hdr *icmp6; 1969 struct mbuf *opts = NULL; 1970 1971 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 1972 if (icmp6 == NULL) { 1973 /* m is already reclaimed */ 1974 return IPPROTO_DONE; 1975 } 1976 1977 /* 1978 * XXX: the address may have embedded scope zone ID, which should be 1979 * hidden from applications. 1980 */ 1981 sockaddr_in6_init(&rip6src, &ip6->ip6_src, 0, 0, 0); 1982 if (sa6_recoverscope(&rip6src)) { 1983 m_freem(m); 1984 return (IPPROTO_DONE); 1985 } 1986 1987 TAILQ_FOREACH(inph, &raw6cbtable.inpt_queue, inph_queue) { 1988 in6p = (struct in6pcb *)inph; 1989 if (in6p->in6p_af != AF_INET6) 1990 continue; 1991 if (in6p->in6p_ip6.ip6_nxt != IPPROTO_ICMPV6) 1992 continue; 1993 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && 1994 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst)) 1995 continue; 1996 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) && 1997 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src)) 1998 continue; 1999 if (in6p->in6p_icmp6filt 2000 && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type, 2001 in6p->in6p_icmp6filt)) 2002 continue; 2003 if (last) { 2004 struct mbuf *n; 2005#ifdef IPSEC 2006 /* 2007 * Check AH/ESP integrity 2008 */ 2009 if (!ipsec_used || 2010 (ipsec_used && !ipsec6_in_reject(m, last))) 2011#endif 2012 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { 2013 if (last->in6p_flags & IN6P_CONTROLOPTS) 2014 ip6_savecontrol(last, &opts, ip6, n); 2015 /* strip intermediate headers */ 2016 m_adj(n, off); 2017 if (sbappendaddr(&last->in6p_socket->so_rcv, 2018 sin6tosa(&rip6src), n, opts) == 0) { 2019 /* should notify about lost packet */ 2020 m_freem(n); 2021 if (opts) 2022 m_freem(opts); 2023 } else 2024 sorwakeup(last->in6p_socket); 2025 opts = NULL; 2026 } 2027 } 2028 last = in6p; 2029 } 2030 2031#ifdef IPSEC 2032 if (ipsec_used && last && ipsec6_in_reject(m, last)) { 2033 m_freem(m); 2034 IP6_STATDEC(IP6_STAT_DELIVERED); 2035 /* do not inject data into pcb */ 2036 } else 2037#endif 2038 if (last) { 2039 if (last->in6p_flags & IN6P_CONTROLOPTS) 2040 ip6_savecontrol(last, &opts, ip6, m); 2041 /* strip intermediate headers */ 2042 m_adj(m, off); 2043 if (sbappendaddr(&last->in6p_socket->so_rcv, 2044 sin6tosa(&rip6src), m, opts) == 0) { 2045 m_freem(m); 2046 if (opts) 2047 m_freem(opts); 2048 } else 2049 sorwakeup(last->in6p_socket); 2050 } else { 2051 m_freem(m); 2052 IP6_STATDEC(IP6_STAT_DELIVERED); 2053 } 2054 return IPPROTO_DONE; 2055} 2056 2057/* 2058 * Reflect the ip6 packet back to the source. 2059 * OFF points to the icmp6 header, counted from the top of the mbuf. 2060 * 2061 * Note: RFC 1885 required that an echo reply should be truncated if it 2062 * did not fit in with (return) path MTU, and KAME code supported the 2063 * behavior. However, as a clarification after the RFC, this limitation 2064 * was removed in a revised version of the spec, RFC 2463. We had kept the 2065 * old behavior, with a (non-default) ifdef block, while the new version of 2066 * the spec was an internet-draft status, and even after the new RFC was 2067 * published. But it would rather make sense to clean the obsoleted part 2068 * up, and to make the code simpler at this stage. 2069 */ 2070void 2071icmp6_reflect(struct mbuf *m, size_t off) 2072{ 2073 struct ip6_hdr *ip6; 2074 struct icmp6_hdr *icmp6; 2075 const struct in6_ifaddr *ia; 2076 const struct ip6aux *ip6a; 2077 int plen; 2078 int type, code; 2079 struct ifnet *outif = NULL; 2080 struct in6_addr origdst; 2081 struct ifnet *rcvif; 2082 int s; 2083 bool ip6_src_filled = false; 2084 2085 /* too short to reflect */ 2086 if (off < sizeof(struct ip6_hdr)) { 2087 nd6log(LOG_DEBUG, 2088 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n", 2089 (u_long)off, (u_long)sizeof(struct ip6_hdr), 2090 __FILE__, __LINE__); 2091 goto bad; 2092 } 2093 2094 /* 2095 * If there are extra headers between IPv6 and ICMPv6, strip 2096 * off that header first. 2097 */ 2098 CTASSERT(sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) <= MHLEN); 2099 if (off > sizeof(struct ip6_hdr)) { 2100 size_t l; 2101 struct ip6_hdr nip6; 2102 2103 l = off - sizeof(struct ip6_hdr); 2104 m_copydata(m, 0, sizeof(nip6), (void *)&nip6); 2105 m_adj(m, l); 2106 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2107 if (m->m_len < l) { 2108 if ((m = m_pullup(m, l)) == NULL) 2109 return; 2110 } 2111 bcopy((void *)&nip6, mtod(m, void *), sizeof(nip6)); 2112 } else { 2113 size_t l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2114 if (m->m_len < l) { 2115 if ((m = m_pullup(m, l)) == NULL) 2116 return; 2117 } 2118 } 2119 2120 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr); 2121 ip6 = mtod(m, struct ip6_hdr *); 2122 ip6->ip6_nxt = IPPROTO_ICMPV6; 2123 icmp6 = (struct icmp6_hdr *)(ip6 + 1); 2124 type = icmp6->icmp6_type; /* keep type for statistics */ 2125 code = icmp6->icmp6_code; /* ditto. */ 2126 2127 origdst = ip6->ip6_dst; 2128 /* 2129 * ip6_input() drops a packet if its src is multicast. 2130 * So, the src is never multicast. 2131 */ 2132 ip6->ip6_dst = ip6->ip6_src; 2133 2134 /* 2135 * If the incoming packet was addressed directly to us (i.e. unicast), 2136 * use dst as the src for the reply. 2137 * The IN6_IFF_NOTREADY case should be VERY rare, but is possible 2138 * (for example) when we encounter an error while forwarding procedure 2139 * destined to a duplicated address of ours. 2140 * Note that ip6_getdstifaddr() may fail if we are in an error handling 2141 * procedure of an outgoing packet of our own, in which case we need 2142 * to search in the ifaddr list. 2143 */ 2144 if (IN6_IS_ADDR_MULTICAST(&origdst)) 2145 ; 2146 else if ((ip6a = ip6_getdstifaddr(m)) != NULL) { 2147 if ((ip6a->ip6a_flags & 2148 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) { 2149 ip6->ip6_src = ip6a->ip6a_src; 2150 ip6_src_filled = true; 2151 } 2152 } else { 2153 union { 2154 struct sockaddr_in6 sin6; 2155 struct sockaddr sa; 2156 } u; 2157 int _s; 2158 struct ifaddr *ifa; 2159 2160 sockaddr_in6_init(&u.sin6, &origdst, 0, 0, 0); 2161 2162 _s = pserialize_read_enter(); 2163 ifa = ifa_ifwithaddr(&u.sa); 2164 2165 if (ifa != NULL) { 2166 ia = ifatoia6(ifa); 2167 if ((ia->ia6_flags & 2168 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) { 2169 ip6->ip6_src = ia->ia_addr.sin6_addr; 2170 ip6_src_filled = true; 2171 } 2172 } 2173 pserialize_read_exit(_s); 2174 } 2175 2176 if (!ip6_src_filled) { 2177 int e; 2178 struct sockaddr_in6 sin6; 2179 struct route ro; 2180 2181 /* 2182 * This case matches to multicasts, our anycast, or unicasts 2183 * that we do not own. Select a source address based on the 2184 * source address of the erroneous packet. 2185 */ 2186 /* zone ID should be embedded */ 2187 sockaddr_in6_init(&sin6, &ip6->ip6_dst, 0, 0, 0); 2188 2189 memset(&ro, 0, sizeof(ro)); 2190 e = in6_selectsrc(&sin6, NULL, NULL, &ro, NULL, NULL, NULL, 2191 &ip6->ip6_src); 2192 rtcache_free(&ro); 2193 if (e != 0) { 2194 char ip6buf[INET6_ADDRSTRLEN]; 2195 nd6log(LOG_DEBUG, 2196 "source can't be determined: " 2197 "dst=%s, error=%d\n", 2198 IN6_PRINT(ip6buf, &sin6.sin6_addr), e); 2199 goto bad; 2200 } 2201 } 2202 2203 ip6->ip6_flow = 0; 2204 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2205 ip6->ip6_vfc |= IPV6_VERSION; 2206 ip6->ip6_nxt = IPPROTO_ICMPV6; 2207 rcvif = m_get_rcvif(m, &s); 2208 if (rcvif) { 2209 /* XXX: This may not be the outgoing interface */ 2210 ip6->ip6_hlim = ND_IFINFO(rcvif)->chlim; 2211 } else 2212 ip6->ip6_hlim = ip6_defhlim; 2213 m_put_rcvif(rcvif, &s); 2214 2215 m->m_pkthdr.csum_flags = 0; 2216 icmp6->icmp6_cksum = 0; 2217 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6, 2218 sizeof(struct ip6_hdr), plen); 2219 2220 /* 2221 * XXX option handling 2222 */ 2223 2224 m->m_flags &= ~(M_BCAST|M_MCAST); 2225 2226 /* 2227 * To avoid a "too big" situation at an intermediate router 2228 * and the path MTU discovery process, specify the IPV6_MINMTU flag. 2229 * Note that only echo and node information replies are affected, 2230 * since the length of ICMP6 errors is limited to the minimum MTU. 2231 */ 2232 if (ip6_output(m, NULL, NULL, IPV6_MINMTU, NULL, NULL, &outif) 2233 != 0 && outif) 2234 icmp6_ifstat_inc(outif, ifs6_out_error); 2235 if (outif) 2236 icmp6_ifoutstat_inc(outif, type, code); 2237 2238 return; 2239 2240 bad: 2241 m_freem(m); 2242 return; 2243} 2244 2245static const char * 2246icmp6_redirect_diag(char *buf, size_t buflen, struct in6_addr *src6, struct in6_addr *dst6, 2247 struct in6_addr *tgt6) 2248{ 2249 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 2250 char ip6buft[INET6_ADDRSTRLEN]; 2251 2252 snprintf(buf, buflen, "(src=%s dst=%s tgt=%s)", 2253 IN6_PRINT(ip6bufs, src6), IN6_PRINT(ip6bufd, dst6), 2254 IN6_PRINT(ip6buft, tgt6)); 2255 return buf; 2256} 2257 2258void 2259icmp6_redirect_input(struct mbuf *m, int off) 2260{ 2261 struct ifnet *ifp; 2262 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 2263 struct nd_redirect *nd_rd; 2264 int icmp6len = ntohs(ip6->ip6_plen); 2265 char *lladdr = NULL; 2266 int lladdrlen = 0; 2267 struct rtentry *rt = NULL; 2268 int is_router; 2269 int is_onlink; 2270 struct in6_addr src6 = ip6->ip6_src; 2271 struct in6_addr redtgt6; 2272 struct in6_addr reddst6; 2273 union nd_opts ndopts; 2274 struct psref psref; 2275 char ip6buf[INET6_ADDRSTRLEN]; 2276 char diagbuf[256]; 2277 2278 ifp = m_get_rcvif_psref(m, &psref); 2279 if (ifp == NULL) 2280 goto freeit; 2281 2282 /* XXX if we are router, we don't update route by icmp6 redirect */ 2283 if (ip6_forwarding) 2284 goto freeit; 2285 if (!icmp6_rediraccept) 2286 goto freeit; 2287 2288 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len); 2289 if (nd_rd == NULL) { 2290 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 2291 m_put_rcvif_psref(ifp, &psref); 2292 return; 2293 } 2294 redtgt6 = nd_rd->nd_rd_target; 2295 reddst6 = nd_rd->nd_rd_dst; 2296 2297 if (in6_setscope(&redtgt6, ifp, NULL) || 2298 in6_setscope(&reddst6, ifp, NULL)) { 2299 goto freeit; 2300 } 2301 2302 /* validation */ 2303 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) { 2304 nd6log(LOG_ERR, 2305 "ICMP6 redirect sent from %s rejected; " 2306 "must be from linklocal\n", IN6_PRINT(ip6buf, &src6)); 2307 goto bad; 2308 } 2309 if (ip6->ip6_hlim != 255) { 2310 nd6log(LOG_ERR, 2311 "ICMP6 redirect sent from %s rejected; " 2312 "hlim=%d (must be 255)\n", 2313 IN6_PRINT(ip6buf, &src6), ip6->ip6_hlim); 2314 goto bad; 2315 } 2316 { 2317 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */ 2318 struct sockaddr_in6 sin6; 2319 struct in6_addr *gw6; 2320 2321 sockaddr_in6_init(&sin6, &reddst6, 0, 0, 0); 2322 rt = rtalloc1(sin6tosa(&sin6), 0); 2323 if (rt) { 2324 if (rt->rt_gateway == NULL || 2325 rt->rt_gateway->sa_family != AF_INET6) { 2326 nd6log(LOG_ERR, 2327 "ICMP6 redirect rejected; no route " 2328 "with inet6 gateway found for redirect dst: %s\n", 2329 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2330 &src6, &reddst6, &redtgt6)); 2331 rt_unref(rt); 2332 goto bad; 2333 } 2334 2335 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr); 2336 if (memcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) { 2337 nd6log(LOG_ERR, 2338 "ICMP6 redirect rejected; " 2339 "not equal to gw-for-src=%s (must be same): %s\n", 2340 IN6_PRINT(ip6buf, gw6), 2341 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2342 &src6, &reddst6, &redtgt6)); 2343 rt_unref(rt); 2344 goto bad; 2345 } 2346 } else { 2347 nd6log(LOG_ERR, "ICMP6 redirect rejected; " 2348 "no route found for redirect dst: %s\n", 2349 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2350 &src6, &reddst6, &redtgt6)); 2351 goto bad; 2352 } 2353 rt_unref(rt); 2354 rt = NULL; 2355 } 2356 if (IN6_IS_ADDR_MULTICAST(&reddst6)) { 2357 nd6log(LOG_ERR, "ICMP6 redirect rejected; " 2358 "redirect dst must be unicast: %s\n", 2359 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2360 &src6, &reddst6, &redtgt6)); 2361 goto bad; 2362 } 2363 2364 is_router = is_onlink = 0; 2365 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 2366 is_router = 1; /* router case */ 2367 if (memcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0) 2368 is_onlink = 1; /* on-link destination case */ 2369 if (!is_router && !is_onlink) { 2370 nd6log(LOG_ERR, "ICMP6 redirect rejected; " 2371 "neither router case nor onlink case: %s\n", 2372 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2373 &src6, &reddst6, &redtgt6)); 2374 goto bad; 2375 } 2376 /* validation passed */ 2377 2378 icmp6len -= sizeof(*nd_rd); 2379 nd6_option_init(nd_rd + 1, icmp6len, &ndopts); 2380 if (nd6_options(&ndopts) < 0) { 2381 nd6log(LOG_INFO, "invalid ND option, rejected: %s\n", 2382 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2383 &src6, &reddst6, &redtgt6)); 2384 /* nd6_options have incremented stats */ 2385 goto freeit; 2386 } 2387 2388 if (ndopts.nd_opts_tgt_lladdr) { 2389 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 2390 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 2391 } 2392 2393 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 2394 nd6log(LOG_INFO, "lladdrlen mismatch for %s " 2395 "(if %d, icmp6 packet %d): %s\n", 2396 IN6_PRINT(ip6buf, &redtgt6), 2397 ifp->if_addrlen, lladdrlen - 2, 2398 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2399 &src6, &reddst6, &redtgt6)); 2400 goto bad; 2401 } 2402 2403 /* RFC 2461 8.3 */ 2404 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT, 2405 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER); 2406 2407 m_put_rcvif_psref(ifp, &psref); 2408 ifp = NULL; 2409 2410 if (!is_onlink) { /* better router case. perform rtredirect. */ 2411 /* perform rtredirect */ 2412 struct sockaddr_in6 sdst; 2413 struct sockaddr_in6 sgw; 2414 struct sockaddr_in6 ssrc; 2415 unsigned long rtcount; 2416 struct rtentry *newrt = NULL; 2417 2418 /* 2419 * do not install redirect route, if the number of entries 2420 * is too much (> hiwat). note that, the node (= host) will 2421 * work just fine even if we do not install redirect route 2422 * (there will be additional hops, though). 2423 */ 2424 mutex_enter(&icmp6_mtx); 2425 rtcount = rt_timer_count(icmp6_redirect_timeout_q); 2426 if (0 <= ip6_maxdynroutes && rtcount >= ip6_maxdynroutes) { 2427 mutex_exit(&icmp6_mtx); 2428 goto freeit; 2429 } 2430 if (0 <= icmp6_redirect_hiwat && rtcount > icmp6_redirect_hiwat) { 2431 mutex_exit(&icmp6_mtx); 2432 goto freeit; 2433 } else if (0 <= icmp6_redirect_lowat && 2434 rtcount > icmp6_redirect_lowat) { 2435 /* 2436 * XXX nuke a victim, install the new one. 2437 */ 2438 } 2439 2440 memset(&sdst, 0, sizeof(sdst)); 2441 memset(&sgw, 0, sizeof(sgw)); 2442 memset(&ssrc, 0, sizeof(ssrc)); 2443 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6; 2444 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len = 2445 sizeof(struct sockaddr_in6); 2446 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr)); 2447 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2448 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr)); 2449 rtredirect(sin6tosa(&sdst), sin6tosa(&sgw), NULL, 2450 RTF_GATEWAY | RTF_HOST, sin6tosa(&ssrc), 2451 &newrt); 2452 2453 if (newrt) { 2454 (void)rt_timer_add(newrt, icmp6_redirect_timeout, 2455 icmp6_redirect_timeout_q); 2456 rt_unref(newrt); 2457 } 2458 mutex_exit(&icmp6_mtx); 2459 } 2460 /* finally update cached route in each socket via pfctlinput */ 2461 { 2462 struct sockaddr_in6 sdst; 2463 2464 sockaddr_in6_init(&sdst, &reddst6, 0, 0, 0); 2465 pfctlinput(PRC_REDIRECT_HOST, sin6tosa(&sdst)); 2466#if defined(IPSEC) 2467 if (ipsec_used) 2468 key_sa_routechange(sin6tosa(&sdst)); 2469#endif 2470 } 2471 2472 freeit: 2473 if (ifp != NULL) 2474 m_put_rcvif_psref(ifp, &psref); 2475 m_freem(m); 2476 return; 2477 2478 bad: 2479 m_put_rcvif_psref(ifp, &psref); 2480 ICMP6_STATINC(ICMP6_STAT_BADREDIRECT); 2481 m_freem(m); 2482} 2483 2484void 2485icmp6_redirect_output(struct mbuf *m0, struct rtentry *rt) 2486{ 2487 struct ifnet *ifp; /* my outgoing interface */ 2488 struct in6_addr *ifp_ll6; 2489 struct in6_addr *nexthop; 2490 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */ 2491 struct mbuf *m = NULL; /* newly allocated one */ 2492 struct ip6_hdr *ip6; /* m as struct ip6_hdr */ 2493 struct nd_redirect *nd_rd; 2494 size_t maxlen; 2495 u_char *p; 2496 struct sockaddr_in6 src_sa; 2497 2498 icmp6_errcount(ICMP6_STAT_OUTERRHIST, ND_REDIRECT, 0); 2499 2500 /* if we are not router, we don't send icmp6 redirect */ 2501 if (!ip6_forwarding) 2502 goto fail; 2503 2504 /* sanity check */ 2505 KASSERT(m0 != NULL); 2506 KASSERT(rt != NULL); 2507 2508 ifp = rt->rt_ifp; 2509 2510 /* 2511 * Address check: 2512 * the source address must identify a neighbor, and 2513 * the destination address must not be a multicast address 2514 * [RFC 2461, sec 8.2] 2515 */ 2516 sip6 = mtod(m0, struct ip6_hdr *); 2517 sockaddr_in6_init(&src_sa, &sip6->ip6_src, 0, 0, 0); 2518 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0) 2519 goto fail; 2520 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst)) 2521 goto fail; /* what should we do here? */ 2522 2523 /* rate limit */ 2524 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0)) 2525 goto fail; 2526 2527 /* 2528 * Since we are going to append up to 1280 bytes (= IPV6_MMTU), 2529 * we almost always ask for an mbuf cluster for simplicity. 2530 * (MHLEN < IPV6_MMTU is almost always true) 2531 */ 2532 MGETHDR(m, M_DONTWAIT, MT_HEADER); 2533 if (m && IPV6_MMTU >= MHLEN) { 2534#if IPV6_MMTU >= MCLBYTES 2535 _MCLGET(m, mcl_cache, IPV6_MMTU, M_DONTWAIT); 2536#else 2537 MCLGET(m, M_DONTWAIT); 2538#endif 2539 } 2540 2541 if (!m) 2542 goto fail; 2543 m_reset_rcvif(m); 2544 m->m_len = 0; 2545 maxlen = M_TRAILINGSPACE(m); 2546 maxlen = min(IPV6_MMTU, maxlen); 2547 /* just for safety */ 2548 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) + 2549 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) { 2550 goto fail; 2551 } 2552 2553 { 2554 /* get ip6 linklocal address for ifp(my outgoing interface). */ 2555 struct in6_ifaddr *ia; 2556 int s = pserialize_read_enter(); 2557 if ((ia = in6ifa_ifpforlinklocal(ifp, 2558 IN6_IFF_NOTREADY| 2559 IN6_IFF_ANYCAST)) == NULL) { 2560 pserialize_read_exit(s); 2561 goto fail; 2562 } 2563 ifp_ll6 = &ia->ia_addr.sin6_addr; 2564 pserialize_read_exit(s); 2565 } 2566 2567 /* get ip6 linklocal address for the router. */ 2568 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) { 2569 struct sockaddr_in6 *sin6; 2570 sin6 = (struct sockaddr_in6 *)rt->rt_gateway; 2571 nexthop = &sin6->sin6_addr; 2572 if (!IN6_IS_ADDR_LINKLOCAL(nexthop)) 2573 nexthop = NULL; 2574 } else 2575 nexthop = NULL; 2576 2577 /* ip6 */ 2578 ip6 = mtod(m, struct ip6_hdr *); 2579 ip6->ip6_flow = 0; 2580 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2581 ip6->ip6_vfc |= IPV6_VERSION; 2582 /* ip6->ip6_plen will be set later */ 2583 ip6->ip6_nxt = IPPROTO_ICMPV6; 2584 ip6->ip6_hlim = 255; 2585 /* ip6->ip6_src must be linklocal addr for my outgoing if. */ 2586 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr)); 2587 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr)); 2588 2589 /* ND Redirect */ 2590 nd_rd = (struct nd_redirect *)(ip6 + 1); 2591 nd_rd->nd_rd_type = ND_REDIRECT; 2592 nd_rd->nd_rd_code = 0; 2593 nd_rd->nd_rd_reserved = 0; 2594 if (rt->rt_flags & RTF_GATEWAY) { 2595 /* 2596 * nd_rd->nd_rd_target must be a link-local address in 2597 * better router cases. 2598 */ 2599 if (!nexthop) 2600 goto fail; 2601 bcopy(nexthop, &nd_rd->nd_rd_target, 2602 sizeof(nd_rd->nd_rd_target)); 2603 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2604 sizeof(nd_rd->nd_rd_dst)); 2605 } else { 2606 /* make sure redtgt == reddst */ 2607 nexthop = &sip6->ip6_dst; 2608 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target, 2609 sizeof(nd_rd->nd_rd_target)); 2610 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2611 sizeof(nd_rd->nd_rd_dst)); 2612 } 2613 2614 p = (u_char *)(nd_rd + 1); 2615 2616 { 2617 /* target lladdr option */ 2618 struct llentry *ln = NULL; 2619 int len; 2620 struct nd_opt_hdr *nd_opt; 2621 char *lladdr; 2622 2623 ln = nd6_lookup(nexthop, ifp, false); 2624 if (ln == NULL) 2625 goto nolladdropt; 2626 len = sizeof(*nd_opt) + ifp->if_addrlen; 2627 len = (len + 7) & ~7; /* round by 8 */ 2628 /* safety check */ 2629 if (len + (p - (u_char *)ip6) > maxlen) { 2630 LLE_RUNLOCK(ln); 2631 goto nolladdropt; 2632 } 2633 if (ln->la_flags & LLE_VALID) { 2634 nd_opt = (struct nd_opt_hdr *)p; 2635 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 2636 nd_opt->nd_opt_len = len >> 3; 2637 lladdr = (char *)(nd_opt + 1); 2638 memcpy(lladdr, &ln->ll_addr, ifp->if_addrlen); 2639 p += len; 2640 } 2641 LLE_RUNLOCK(ln); 2642 } 2643 nolladdropt:; 2644 2645 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2646 2647 /* just to be safe */ 2648 if (m0->m_flags & M_DECRYPTED) 2649 goto noredhdropt; 2650 if (p - (u_char *)ip6 > maxlen) 2651 goto noredhdropt; 2652 2653 { 2654 /* redirected header option */ 2655 int len; 2656 struct nd_opt_rd_hdr *nd_opt_rh; 2657 2658 /* 2659 * compute the maximum size for icmp6 redirect header option. 2660 * XXX room for auth header? 2661 */ 2662 len = maxlen - (p - (u_char *)ip6); 2663 len &= ~7; 2664 2665 /* 2666 * Redirected header option spec (RFC2461 4.6.3) talks nothing 2667 * about padding/truncate rule for the original IP packet. 2668 * From the discussion on IPv6imp in Feb 1999, 2669 * the consensus was: 2670 * - "attach as much as possible" is the goal 2671 * - pad if not aligned (original size can be guessed by 2672 * original ip6 header) 2673 * Following code adds the padding if it is simple enough, 2674 * and truncates if not. 2675 */ 2676 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) { 2677 /* not enough room, truncate */ 2678 m_adj(m0, (len - sizeof(*nd_opt_rh)) - 2679 m0->m_pkthdr.len); 2680 } else { 2681 /* 2682 * enough room, truncate if not aligned. 2683 * we don't pad here for simplicity. 2684 */ 2685 size_t extra; 2686 2687 extra = m0->m_pkthdr.len % 8; 2688 if (extra) { 2689 /* truncate */ 2690 m_adj(m0, -extra); 2691 } 2692 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh); 2693 } 2694 2695 nd_opt_rh = (struct nd_opt_rd_hdr *)p; 2696 memset(nd_opt_rh, 0, sizeof(*nd_opt_rh)); 2697 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER; 2698 nd_opt_rh->nd_opt_rh_len = len >> 3; 2699 p += sizeof(*nd_opt_rh); 2700 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2701 2702 /* connect m0 to m */ 2703 m->m_pkthdr.len += m0->m_pkthdr.len; 2704 m_cat(m, m0); 2705 m0 = NULL; 2706 } 2707noredhdropt: 2708 if (m0) { 2709 m_freem(m0); 2710 m0 = NULL; 2711 } 2712 2713 /* XXX: clear embedded link IDs in the inner header */ 2714 in6_clearscope(&sip6->ip6_src); 2715 in6_clearscope(&sip6->ip6_dst); 2716 in6_clearscope(&nd_rd->nd_rd_target); 2717 in6_clearscope(&nd_rd->nd_rd_dst); 2718 2719 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 2720 2721 nd_rd->nd_rd_cksum = 0; 2722 nd_rd->nd_rd_cksum 2723 = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen)); 2724 2725 /* send the packet to outside... */ 2726 if (ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL) != 0) 2727 icmp6_ifstat_inc(ifp, ifs6_out_error); 2728 2729 icmp6_ifstat_inc(ifp, ifs6_out_msg); 2730 icmp6_ifstat_inc(ifp, ifs6_out_redirect); 2731 ICMP6_STATINC(ICMP6_STAT_OUTHIST + ND_REDIRECT); 2732 2733 return; 2734 2735fail: 2736 if (m) 2737 m_freem(m); 2738 if (m0) 2739 m_freem(m0); 2740} 2741 2742/* 2743 * ICMPv6 socket option processing. 2744 */ 2745int 2746icmp6_ctloutput(int op, struct socket *so, struct sockopt *sopt) 2747{ 2748 int error = 0; 2749 struct in6pcb *in6p = sotoin6pcb(so); 2750 2751 if (sopt->sopt_level != IPPROTO_ICMPV6) 2752 return rip6_ctloutput(op, so, sopt); 2753 2754 switch (op) { 2755 case PRCO_SETOPT: 2756 switch (sopt->sopt_name) { 2757 case ICMP6_FILTER: 2758 { 2759 struct icmp6_filter fil; 2760 2761 error = sockopt_get(sopt, &fil, sizeof(fil)); 2762 if (error) 2763 break; 2764 memcpy(in6p->in6p_icmp6filt, &fil, 2765 sizeof(struct icmp6_filter)); 2766 error = 0; 2767 break; 2768 } 2769 2770 default: 2771 error = ENOPROTOOPT; 2772 break; 2773 } 2774 break; 2775 2776 case PRCO_GETOPT: 2777 switch (sopt->sopt_name) { 2778 case ICMP6_FILTER: 2779 { 2780 if (in6p->in6p_icmp6filt == NULL) { 2781 error = EINVAL; 2782 break; 2783 } 2784 error = sockopt_set(sopt, in6p->in6p_icmp6filt, 2785 sizeof(struct icmp6_filter)); 2786 break; 2787 } 2788 2789 default: 2790 error = ENOPROTOOPT; 2791 break; 2792 } 2793 break; 2794 } 2795 2796 return (error); 2797} 2798 2799/* 2800 * Perform rate limit check. 2801 * Returns 0 if it is okay to send the icmp6 packet. 2802 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate 2803 * limitation. 2804 * 2805 * XXX per-destination/type check necessary? 2806 */ 2807static int 2808icmp6_ratelimit( 2809 const struct in6_addr *dst, /* not used at this moment */ 2810 const int type, /* not used at this moment */ 2811 const int code) /* not used at this moment */ 2812{ 2813 int ret; 2814 2815 ret = 0; /* okay to send */ 2816 2817 /* PPS limit */ 2818 if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count, 2819 icmp6errppslim)) { 2820 /* The packet is subject to rate limit */ 2821 ret++; 2822 } 2823 2824 return ret; 2825} 2826 2827static struct rtentry * 2828icmp6_mtudisc_clone(struct sockaddr *dst) 2829{ 2830 struct rtentry *rt; 2831 int error; 2832 2833 rt = rtalloc1(dst, 1); 2834 if (rt == 0) 2835 return NULL; 2836 2837 /* If we didn't get a host route, allocate one */ 2838 if ((rt->rt_flags & RTF_HOST) == 0) { 2839 struct rtentry *nrt; 2840 2841 error = rtrequest(RTM_ADD, dst, rt->rt_gateway, NULL, 2842 RTF_GATEWAY | RTF_HOST | RTF_DYNAMIC, &nrt); 2843 if (error) { 2844 rt_unref(rt); 2845 return NULL; 2846 } 2847 nrt->rt_rmx = rt->rt_rmx; 2848 rt_unref(rt); 2849 rt = nrt; 2850 } 2851 2852 mutex_enter(&icmp6_mtx); 2853 error = rt_timer_add(rt, icmp6_mtudisc_timeout, 2854 icmp6_mtudisc_timeout_q); 2855 mutex_exit(&icmp6_mtx); 2856 2857 if (error) { 2858 rt_unref(rt); 2859 return NULL; 2860 } 2861 2862 return rt; /* caller need to call rtfree() */ 2863} 2864 2865static void 2866icmp6_mtudisc_timeout(struct rtentry *rt, struct rttimer *r) 2867{ 2868 2869 KASSERT(rt != NULL); 2870 rt_assert_referenced(rt); 2871 2872 if ((rt->rt_flags & (RTF_DYNAMIC | RTF_HOST)) == 2873 (RTF_DYNAMIC | RTF_HOST)) { 2874 rtrequest(RTM_DELETE, rt_getkey(rt), 2875 rt->rt_gateway, rt_mask(rt), rt->rt_flags, NULL); 2876 } else { 2877 if (!(rt->rt_rmx.rmx_locks & RTV_MTU)) 2878 rt->rt_rmx.rmx_mtu = 0; 2879 } 2880} 2881 2882static void 2883icmp6_redirect_timeout(struct rtentry *rt, struct rttimer *r) 2884{ 2885 2886 KASSERT(rt != NULL); 2887 rt_assert_referenced(rt); 2888 2889 if ((rt->rt_flags & (RTF_GATEWAY | RTF_DYNAMIC | RTF_HOST)) == 2890 (RTF_GATEWAY | RTF_DYNAMIC | RTF_HOST)) { 2891 rtrequest(RTM_DELETE, rt_getkey(rt), 2892 rt->rt_gateway, rt_mask(rt), rt->rt_flags, NULL); 2893 } 2894} 2895 2896/* 2897 * sysctl helper routine for the net.inet6.icmp6.nd6 nodes. silly? 2898 */ 2899static int 2900sysctl_net_inet6_icmp6_nd6(SYSCTLFN_ARGS) 2901{ 2902 (void)&name; 2903 (void)&l; 2904 (void)&oname; 2905 2906 if (namelen != 0) 2907 return (EINVAL); 2908 2909 return (nd6_sysctl(rnode->sysctl_num, oldp, oldlenp, 2910 /*XXXUNCONST*/ 2911 __UNCONST(newp), newlen)); 2912} 2913 2914static int 2915sysctl_net_inet6_icmp6_stats(SYSCTLFN_ARGS) 2916{ 2917 2918 return (NETSTAT_SYSCTL(icmp6stat_percpu, ICMP6_NSTATS)); 2919} 2920 2921static int 2922sysctl_net_inet6_icmp6_redirtimeout(SYSCTLFN_ARGS) 2923{ 2924 int error, tmp; 2925 struct sysctlnode node; 2926 2927 mutex_enter(&icmp6_mtx); 2928 2929 node = *rnode; 2930 node.sysctl_data = &tmp; 2931 tmp = icmp6_redirtimeout; 2932 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 2933 if (error || newp == NULL) 2934 goto out; 2935 if (tmp < 0) { 2936 error = EINVAL; 2937 goto out; 2938 } 2939 icmp6_redirtimeout = tmp; 2940 2941 if (icmp6_redirect_timeout_q != NULL) { 2942 if (icmp6_redirtimeout == 0) { 2943 rt_timer_queue_destroy(icmp6_redirect_timeout_q); 2944 } else { 2945 rt_timer_queue_change(icmp6_redirect_timeout_q, 2946 icmp6_redirtimeout); 2947 } 2948 } else if (icmp6_redirtimeout > 0) { 2949 icmp6_redirect_timeout_q = 2950 rt_timer_queue_create(icmp6_redirtimeout); 2951 } 2952 error = 0; 2953out: 2954 mutex_exit(&icmp6_mtx); 2955 return error; 2956} 2957 2958static void 2959sysctl_net_inet6_icmp6_setup(struct sysctllog **clog) 2960{ 2961 extern int nd6_maxqueuelen; /* defined in nd6.c */ 2962 2963 sysctl_createv(clog, 0, NULL, NULL, 2964 CTLFLAG_PERMANENT, 2965 CTLTYPE_NODE, "inet6", NULL, 2966 NULL, 0, NULL, 0, 2967 CTL_NET, PF_INET6, CTL_EOL); 2968 sysctl_createv(clog, 0, NULL, NULL, 2969 CTLFLAG_PERMANENT, 2970 CTLTYPE_NODE, "icmp6", 2971 SYSCTL_DESCR("ICMPv6 related settings"), 2972 NULL, 0, NULL, 0, 2973 CTL_NET, PF_INET6, IPPROTO_ICMPV6, CTL_EOL); 2974 2975 sysctl_createv(clog, 0, NULL, NULL, 2976 CTLFLAG_PERMANENT, 2977 CTLTYPE_STRUCT, "stats", 2978 SYSCTL_DESCR("ICMPv6 transmission statistics"), 2979 sysctl_net_inet6_icmp6_stats, 0, NULL, 0, 2980 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2981 ICMPV6CTL_STATS, CTL_EOL); 2982 sysctl_createv(clog, 0, NULL, NULL, 2983 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2984 CTLTYPE_INT, "rediraccept", 2985 SYSCTL_DESCR("Accept and process redirect messages"), 2986 NULL, 0, &icmp6_rediraccept, 0, 2987 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2988 ICMPV6CTL_REDIRACCEPT, CTL_EOL); 2989 sysctl_createv(clog, 0, NULL, NULL, 2990 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2991 CTLTYPE_INT, "redirtimeout", 2992 SYSCTL_DESCR("Redirect generated route lifetime"), 2993 sysctl_net_inet6_icmp6_redirtimeout, 0, 2994 &icmp6_redirtimeout, 0, 2995 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2996 ICMPV6CTL_REDIRTIMEOUT, CTL_EOL); 2997#if 0 /* obsoleted */ 2998 sysctl_createv(clog, 0, NULL, NULL, 2999 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3000 CTLTYPE_INT, "errratelimit", NULL, 3001 NULL, 0, &icmp6_errratelimit, 0, 3002 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3003 ICMPV6CTL_ERRRATELIMIT, CTL_EOL); 3004#endif 3005 sysctl_createv(clog, 0, NULL, NULL, 3006 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3007 CTLTYPE_INT, "nd6_prune", 3008 SYSCTL_DESCR("Neighbor discovery prune interval"), 3009 NULL, 0, &nd6_prune, 0, 3010 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3011 ICMPV6CTL_ND6_PRUNE, CTL_EOL); 3012 sysctl_createv(clog, 0, NULL, NULL, 3013 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3014 CTLTYPE_INT, "nd6_delay", 3015 SYSCTL_DESCR("First probe delay time"), 3016 NULL, 0, &nd6_delay, 0, 3017 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3018 ICMPV6CTL_ND6_DELAY, CTL_EOL); 3019 sysctl_createv(clog, 0, NULL, NULL, 3020 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3021 CTLTYPE_INT, "nd6_umaxtries", 3022 SYSCTL_DESCR("Number of unicast discovery attempts"), 3023 NULL, 0, &nd6_umaxtries, 0, 3024 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3025 ICMPV6CTL_ND6_UMAXTRIES, CTL_EOL); 3026 sysctl_createv(clog, 0, NULL, NULL, 3027 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3028 CTLTYPE_INT, "nd6_mmaxtries", 3029 SYSCTL_DESCR("Number of multicast discovery attempts"), 3030 NULL, 0, &nd6_mmaxtries, 0, 3031 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3032 ICMPV6CTL_ND6_MMAXTRIES, CTL_EOL); 3033 sysctl_createv(clog, 0, NULL, NULL, 3034 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3035 CTLTYPE_INT, "nd6_useloopback", 3036 SYSCTL_DESCR("Use loopback interface for local traffic"), 3037 NULL, 0, &nd6_useloopback, 0, 3038 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3039 ICMPV6CTL_ND6_USELOOPBACK, CTL_EOL); 3040#if 0 /* obsoleted */ 3041 sysctl_createv(clog, 0, NULL, NULL, 3042 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3043 CTLTYPE_INT, "nd6_proxyall", NULL, 3044 NULL, 0, &nd6_proxyall, 0, 3045 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3046 ICMPV6CTL_ND6_PROXYALL, CTL_EOL); 3047#endif 3048 sysctl_createv(clog, 0, NULL, NULL, 3049 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3050 CTLTYPE_INT, "nodeinfo", 3051 SYSCTL_DESCR("Respond to node information requests"), 3052 NULL, 0, &icmp6_nodeinfo, 0, 3053 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3054 ICMPV6CTL_NODEINFO, CTL_EOL); 3055 sysctl_createv(clog, 0, NULL, NULL, 3056 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3057 CTLTYPE_INT, "errppslimit", 3058 SYSCTL_DESCR("Maximum ICMP errors sent per second"), 3059 NULL, 0, &icmp6errppslim, 0, 3060 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3061 ICMPV6CTL_ERRPPSLIMIT, CTL_EOL); 3062 sysctl_createv(clog, 0, NULL, NULL, 3063 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3064 CTLTYPE_INT, "nd6_maxnudhint", 3065 SYSCTL_DESCR("Maximum neighbor unreachable hint count"), 3066 NULL, 0, &nd6_maxnudhint, 0, 3067 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3068 ICMPV6CTL_ND6_MAXNUDHINT, CTL_EOL); 3069 sysctl_createv(clog, 0, NULL, NULL, 3070 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3071 CTLTYPE_INT, "mtudisc_hiwat", 3072 SYSCTL_DESCR("Low mark on MTU Discovery route timers"), 3073 NULL, 0, &icmp6_mtudisc_hiwat, 0, 3074 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3075 ICMPV6CTL_MTUDISC_HIWAT, CTL_EOL); 3076 sysctl_createv(clog, 0, NULL, NULL, 3077 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3078 CTLTYPE_INT, "mtudisc_lowat", 3079 SYSCTL_DESCR("Low mark on MTU Discovery route timers"), 3080 NULL, 0, &icmp6_mtudisc_lowat, 0, 3081 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3082 ICMPV6CTL_MTUDISC_LOWAT, CTL_EOL); 3083 sysctl_createv(clog, 0, NULL, NULL, 3084 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3085 CTLTYPE_INT, "nd6_debug", 3086 SYSCTL_DESCR("Enable neighbor discovery debug output"), 3087 NULL, 0, &nd6_debug, 0, 3088 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3089 ICMPV6CTL_ND6_DEBUG, CTL_EOL); 3090 sysctl_createv(clog, 0, NULL, NULL, 3091 CTLFLAG_PERMANENT, 3092 CTLTYPE_STRUCT, "nd6_drlist", 3093 SYSCTL_DESCR("Default router list"), 3094 sysctl_net_inet6_icmp6_nd6, 0, NULL, 0, 3095 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3096 ICMPV6CTL_ND6_DRLIST, CTL_EOL); 3097 sysctl_createv(clog, 0, NULL, NULL, 3098 CTLFLAG_PERMANENT, 3099 CTLTYPE_STRUCT, "nd6_prlist", 3100 SYSCTL_DESCR("Prefix list"), 3101 sysctl_net_inet6_icmp6_nd6, 0, NULL, 0, 3102 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3103 ICMPV6CTL_ND6_PRLIST, CTL_EOL); 3104 sysctl_createv(clog, 0, NULL, NULL, 3105 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3106 CTLTYPE_INT, "maxqueuelen", 3107 SYSCTL_DESCR("max packet queue len for a unresolved ND"), 3108 NULL, 1, &nd6_maxqueuelen, 0, 3109 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3110 ICMPV6CTL_ND6_MAXQLEN, CTL_EOL); 3111} 3112 3113void 3114icmp6_statinc(u_int stat) 3115{ 3116 3117 KASSERT(stat < ICMP6_NSTATS); 3118 ICMP6_STATINC(stat); 3119} 3120