icmp6.c revision 1.213
1/* $NetBSD: icmp6.c,v 1.213 2017/08/02 02:18:17 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 1.213 2017/08/02 02:18:17 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 <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 if (ifp == NULL) 296 return; 297 298 if (m->m_len < sizeof(struct ip6_hdr)) { 299 m = m_pullup(m, sizeof(struct ip6_hdr)); 300 if (m == NULL) 301 return; 302 } 303 304 ip6 = mtod(m, struct ip6_hdr *); 305 306 if (in6_setscope(&ip6->ip6_src, ifp, NULL) != 0) 307 return; 308 if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0) 309 return; 310 311 icmp6_error(m, type, code, param); 312} 313 314/* 315 * Generate an error packet of type error in response to bad IP6 packet. 316 */ 317void 318icmp6_error(struct mbuf *m, int type, int code, int param) 319{ 320 struct ip6_hdr *oip6, *nip6; 321 struct icmp6_hdr *icmp6; 322 u_int preplen; 323 int off; 324 int nxt; 325 326 ICMP6_STATINC(ICMP6_STAT_ERROR); 327 328 /* count per-type-code statistics */ 329 icmp6_errcount(ICMP6_STAT_OUTERRHIST, type, code); 330 331 if (m->m_flags & M_DECRYPTED) { 332 ICMP6_STATINC(ICMP6_STAT_CANTERROR); 333 goto freeit; 334 } 335 336 if (M_UNWRITABLE(m, sizeof(struct ip6_hdr)) && 337 (m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) 338 return; 339 oip6 = mtod(m, struct ip6_hdr *); 340 341 /* 342 * If the destination address of the erroneous packet is a multicast 343 * address, or the packet was sent using link-layer multicast, 344 * we should basically suppress sending an error (RFC 2463, Section 345 * 2.4). 346 * We have two exceptions (the item e.2 in that section): 347 * - the Pakcet Too Big message can be sent for path MTU discovery. 348 * - the Parameter Problem Message that can be allowed an icmp6 error 349 * in the option type field. This check has been done in 350 * ip6_unknown_opt(), so we can just check the type and code. 351 */ 352 if ((m->m_flags & (M_BCAST|M_MCAST) || 353 IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) && 354 (type != ICMP6_PACKET_TOO_BIG && 355 (type != ICMP6_PARAM_PROB || 356 code != ICMP6_PARAMPROB_OPTION))) 357 goto freeit; 358 359 /* 360 * RFC 2463, 2.4 (e.5): source address check. 361 * XXX: the case of anycast source? 362 */ 363 if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) || 364 IN6_IS_ADDR_MULTICAST(&oip6->ip6_src)) 365 goto freeit; 366 367 /* 368 * If we are about to send ICMPv6 against ICMPv6 error/redirect, 369 * don't do it. 370 */ 371 nxt = -1; 372 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 373 if (off >= 0 && nxt == IPPROTO_ICMPV6) { 374 struct icmp6_hdr *icp; 375 376 IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off, 377 sizeof(*icp)); 378 if (icp == NULL) { 379 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 380 return; 381 } 382 if (icp->icmp6_type < ICMP6_ECHO_REQUEST || 383 icp->icmp6_type == ND_REDIRECT) { 384 /* 385 * ICMPv6 error 386 * Special case: for redirect (which is 387 * informational) we must not send icmp6 error. 388 */ 389 ICMP6_STATINC(ICMP6_STAT_CANTERROR); 390 goto freeit; 391 } else { 392 /* ICMPv6 informational - send the error */ 393 } 394 } 395#if 0 /* controversial */ 396 else if (off >= 0 && nxt == IPPROTO_ESP) { 397 /* 398 * It could be ICMPv6 error inside ESP. Take a safer side, 399 * don't respond. 400 */ 401 ICMP6_STATINC(ICMP6_STAT_CANTERROR); 402 goto freeit; 403 } 404#endif 405 else { 406 /* non-ICMPv6 - send the error */ 407 } 408 409 oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */ 410 411 /* Finally, do rate limitation check. */ 412 if (icmp6_ratelimit(&oip6->ip6_src, type, code)) { 413 ICMP6_STATINC(ICMP6_STAT_TOOFREQ); 414 goto freeit; 415 } 416 417 /* 418 * OK, ICMP6 can be generated. 419 */ 420 421 if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN) 422 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len); 423 424 preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 425 M_PREPEND(m, preplen, M_DONTWAIT); 426 if (m && M_UNWRITABLE(m, preplen)) 427 m = m_pullup(m, preplen); 428 if (m == NULL) { 429 nd6log(LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__); 430 return; 431 } 432 433 nip6 = mtod(m, struct ip6_hdr *); 434 nip6->ip6_src = oip6->ip6_src; 435 nip6->ip6_dst = oip6->ip6_dst; 436 437 in6_clearscope(&oip6->ip6_src); 438 in6_clearscope(&oip6->ip6_dst); 439 440 icmp6 = (struct icmp6_hdr *)(nip6 + 1); 441 icmp6->icmp6_type = type; 442 icmp6->icmp6_code = code; 443 icmp6->icmp6_pptr = htonl((u_int32_t)param); 444 445 /* 446 * icmp6_reflect() is designed to be in the input path. 447 * icmp6_error() can be called from both input and output path, 448 * and if we are in output path rcvif could contain bogus value. 449 * clear m->m_pkthdr.rcvif for safety, we should have enough scope 450 * information in ip header (nip6). 451 */ 452 m_reset_rcvif(m); 453 454 ICMP6_STATINC(ICMP6_STAT_OUTHIST + type); 455 icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */ 456 457 return; 458 459 freeit: 460 /* 461 * If we can't tell whether or not we can generate ICMP6, free it. 462 */ 463 m_freem(m); 464} 465 466/* 467 * Process a received ICMP6 message. 468 */ 469static void 470_icmp6_input(struct mbuf *m, int off, int proto) 471{ 472 struct mbuf *n; 473 struct ip6_hdr *ip6, *nip6; 474 struct icmp6_hdr *icmp6, *nicmp6; 475 int icmp6len = m->m_pkthdr.len - off; 476 int code, sum, noff; 477 struct ifnet *rcvif; 478 struct psref psref; 479 char ip6buf[INET6_ADDRSTRLEN], ip6buf2[INET6_ADDRSTRLEN]; 480 481 rcvif = m_get_rcvif_psref(m, &psref); 482 if (__predict_false(rcvif == NULL)) 483 goto freeit; 484 485#define ICMP6_MAXLEN (sizeof(*nip6) + sizeof(*nicmp6) + 4) 486 KASSERT(ICMP6_MAXLEN < MCLBYTES); 487 icmp6_ifstat_inc(rcvif, ifs6_in_msg); 488 489 /* 490 * Locate icmp6 structure in mbuf, and check 491 * that not corrupted and of at least minimum length 492 */ 493 494 if (icmp6len < sizeof(struct icmp6_hdr)) { 495 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 496 icmp6_ifstat_inc(rcvif, ifs6_in_error); 497 goto freeit; 498 } 499 500 if (m->m_len < sizeof(struct ip6_hdr)) { 501 m = m_pullup(m, sizeof(struct ip6_hdr)); 502 if (m == NULL) { 503 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 504 icmp6_ifstat_inc(rcvif, ifs6_in_error); 505 goto freeit; 506 } 507 } 508 509 ip6 = mtod(m, struct ip6_hdr *); 510 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 511 if (icmp6 == NULL) { 512 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 513 icmp6_ifstat_inc(rcvif, ifs6_in_error); 514 goto freeit; 515 } 516 /* 517 * Enforce alignment requirements that are violated in 518 * some cases, see kern/50766 for details. 519 */ 520 if (IP6_HDR_ALIGNED_P(icmp6) == 0) { 521 m = m_copyup(m, off + sizeof(struct icmp6_hdr), 0); 522 if (m == NULL) { 523 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 524 icmp6_ifstat_inc(rcvif, ifs6_in_error); 525 goto freeit; 526 } 527 ip6 = mtod(m, struct ip6_hdr *); 528 icmp6 = (struct icmp6_hdr *)(ip6 + 1); 529 } 530 KASSERT(IP6_HDR_ALIGNED_P(icmp6)); 531 532 /* 533 * calculate the checksum 534 */ 535 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) { 536 nd6log(LOG_ERR, "ICMP6 checksum error(%d|%x) %s\n", 537 icmp6->icmp6_type, sum, IN6_PRINT(ip6buf, &ip6->ip6_src)); 538 ICMP6_STATINC(ICMP6_STAT_CHECKSUM); 539 icmp6_ifstat_inc(rcvif, ifs6_in_error); 540 goto freeit; 541 } 542 543#if defined(NFAITH) && 0 < NFAITH 544 if (faithprefix(&ip6->ip6_dst)) { 545 /* 546 * Deliver very specific ICMP6 type only. 547 * This is important to deliver TOOBIG. Otherwise PMTUD 548 * will not work. 549 */ 550 switch (icmp6->icmp6_type) { 551 case ICMP6_DST_UNREACH: 552 case ICMP6_PACKET_TOO_BIG: 553 case ICMP6_TIME_EXCEEDED: 554 break; 555 default: 556 goto freeit; 557 } 558 } 559#endif 560 561 code = icmp6->icmp6_code; 562 ICMP6_STATINC(ICMP6_STAT_INHIST + icmp6->icmp6_type); 563 564 switch (icmp6->icmp6_type) { 565 case ICMP6_DST_UNREACH: 566 icmp6_ifstat_inc(rcvif, ifs6_in_dstunreach); 567 switch (code) { 568 case ICMP6_DST_UNREACH_NOROUTE: 569 code = PRC_UNREACH_NET; 570 break; 571 case ICMP6_DST_UNREACH_ADMIN: 572 icmp6_ifstat_inc(rcvif, ifs6_in_adminprohib); 573 code = PRC_UNREACH_PROTOCOL; /* is this a good code? */ 574 break; 575 case ICMP6_DST_UNREACH_ADDR: 576 code = PRC_HOSTDEAD; 577 break; 578#ifdef COMPAT_RFC1885 579 case ICMP6_DST_UNREACH_NOTNEIGHBOR: 580 code = PRC_UNREACH_SRCFAIL; 581 break; 582#else 583 case ICMP6_DST_UNREACH_BEYONDSCOPE: 584 /* I mean "source address was incorrect." */ 585 code = PRC_UNREACH_NET; 586 break; 587#endif 588 case ICMP6_DST_UNREACH_NOPORT: 589 code = PRC_UNREACH_PORT; 590 break; 591 default: 592 goto badcode; 593 } 594 goto deliver; 595 596 case ICMP6_PACKET_TOO_BIG: 597 icmp6_ifstat_inc(rcvif, ifs6_in_pkttoobig); 598 599 /* 600 * MTU is checked in icmp6_mtudisc. 601 */ 602 code = PRC_MSGSIZE; 603 604 /* 605 * Updating the path MTU will be done after examining 606 * intermediate extension headers. 607 */ 608 goto deliver; 609 610 case ICMP6_TIME_EXCEEDED: 611 icmp6_ifstat_inc(rcvif, ifs6_in_timeexceed); 612 switch (code) { 613 case ICMP6_TIME_EXCEED_TRANSIT: 614 code = PRC_TIMXCEED_INTRANS; 615 break; 616 case ICMP6_TIME_EXCEED_REASSEMBLY: 617 code = PRC_TIMXCEED_REASS; 618 break; 619 default: 620 goto badcode; 621 } 622 goto deliver; 623 624 case ICMP6_PARAM_PROB: 625 icmp6_ifstat_inc(rcvif, ifs6_in_paramprob); 626 switch (code) { 627 case ICMP6_PARAMPROB_NEXTHEADER: 628 code = PRC_UNREACH_PROTOCOL; 629 break; 630 case ICMP6_PARAMPROB_HEADER: 631 case ICMP6_PARAMPROB_OPTION: 632 code = PRC_PARAMPROB; 633 break; 634 default: 635 goto badcode; 636 } 637 goto deliver; 638 639 case ICMP6_ECHO_REQUEST: 640 icmp6_ifstat_inc(rcvif, ifs6_in_echo); 641 if (code != 0) 642 goto badcode; 643 /* 644 * Copy mbuf to send to two data paths: userland socket(s), 645 * and to the querier (echo reply). 646 * m: a copy for socket, n: a copy for querier 647 * 648 * If the first mbuf is shared, or the first mbuf is too short, 649 * copy the first part of the data into a fresh mbuf. 650 * Otherwise, we will wrongly overwrite both copies. 651 */ 652 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 653 /* Give up local */ 654 n = m; 655 m = NULL; 656 } else if (M_READONLY(n) || 657 n->m_len < off + sizeof(struct icmp6_hdr)) { 658 struct mbuf *n0 = n; 659 660 /* 661 * Prepare an internal mbuf. m_pullup() doesn't 662 * always copy the length we specified. 663 */ 664 if ((n = m_dup(n0, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 665 /* Give up local */ 666 n = m; 667 m = NULL; 668 } 669 m_freem(n0); 670 } 671 IP6_EXTHDR_GET(nicmp6, struct icmp6_hdr *, n, off, 672 sizeof(*nicmp6)); 673 if (nicmp6 == NULL) 674 goto freeit; 675 nicmp6->icmp6_type = ICMP6_ECHO_REPLY; 676 nicmp6->icmp6_code = 0; 677 if (n) { 678 uint64_t *icmp6s = ICMP6_STAT_GETREF(); 679 icmp6s[ICMP6_STAT_REFLECT]++; 680 icmp6s[ICMP6_STAT_OUTHIST + ICMP6_ECHO_REPLY]++; 681 ICMP6_STAT_PUTREF(); 682 icmp6_reflect(n, off); 683 } 684 if (!m) 685 goto freeit; 686 break; 687 688 case ICMP6_ECHO_REPLY: 689 icmp6_ifstat_inc(rcvif, ifs6_in_echoreply); 690 if (code != 0) 691 goto badcode; 692 break; 693 694 case MLD_LISTENER_QUERY: 695 case MLD_LISTENER_REPORT: 696 if (icmp6len < sizeof(struct mld_hdr)) 697 goto badlen; 698 if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */ 699 icmp6_ifstat_inc(rcvif, ifs6_in_mldquery); 700 else 701 icmp6_ifstat_inc(rcvif, ifs6_in_mldreport); 702 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 703 /* give up local */ 704 mld_input(m, off); 705 m = NULL; 706 goto freeit; 707 } 708 mld_input(n, off); 709 /* m stays. */ 710 break; 711 712 case MLD_LISTENER_DONE: 713 icmp6_ifstat_inc(rcvif, ifs6_in_mlddone); 714 if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */ 715 goto badlen; 716 break; /* nothing to be done in kernel */ 717 718 case MLD_MTRACE_RESP: 719 case MLD_MTRACE: 720 /* XXX: these two are experimental. not officially defined. */ 721 /* XXX: per-interface statistics? */ 722 break; /* just pass it to applications */ 723 724 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */ 725 { 726 enum { WRU, FQDN } mode; 727 728 if (!icmp6_nodeinfo) 729 break; 730 731 if (icmp6len == sizeof(struct icmp6_hdr) + 4) 732 mode = WRU; 733 else if (icmp6len >= sizeof(struct icmp6_nodeinfo)) 734 mode = FQDN; 735 else 736 goto badlen; 737 738 if (mode == FQDN) { 739 n = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 740 if (n) 741 n = ni6_input(n, off); 742 /* XXX meaningless if n == NULL */ 743 noff = sizeof(struct ip6_hdr); 744 } else { 745 u_char *p; 746 int maxhlen; 747 748 if ((icmp6_nodeinfo & 5) != 5) 749 break; 750 751 if (code != 0) 752 goto badcode; 753 MGETHDR(n, M_DONTWAIT, m->m_type); 754 if (n && ICMP6_MAXLEN > MHLEN) { 755 MCLGET(n, M_DONTWAIT); 756 if ((n->m_flags & M_EXT) == 0) { 757 m_free(n); 758 n = NULL; 759 } 760 } 761 if (n == NULL) { 762 /* Give up remote */ 763 break; 764 } 765 m_reset_rcvif(n); 766 n->m_len = 0; 767 maxhlen = M_TRAILINGSPACE(n) - ICMP6_MAXLEN; 768 if (maxhlen < 0) 769 break; 770 if (maxhlen > hostnamelen) 771 maxhlen = hostnamelen; 772 /* 773 * Copy IPv6 and ICMPv6 only. 774 */ 775 nip6 = mtod(n, struct ip6_hdr *); 776 bcopy(ip6, nip6, sizeof(struct ip6_hdr)); 777 nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 778 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); 779 p = (u_char *)(nicmp6 + 1); 780 memset(p, 0, 4); 781 bcopy(hostname, p + 4, maxhlen); /* meaningless TTL */ 782 noff = sizeof(struct ip6_hdr); 783 M_COPY_PKTHDR(n, m); /* just for rcvif */ 784 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 785 sizeof(struct icmp6_hdr) + 4 + maxhlen; 786 nicmp6->icmp6_type = ICMP6_WRUREPLY; 787 nicmp6->icmp6_code = 0; 788 } 789#undef hostnamelen 790 if (n) { 791 uint64_t *icmp6s = ICMP6_STAT_GETREF(); 792 icmp6s[ICMP6_STAT_REFLECT]++; 793 icmp6s[ICMP6_STAT_OUTHIST + ICMP6_WRUREPLY]++; 794 ICMP6_STAT_PUTREF(); 795 icmp6_reflect(n, noff); 796 } 797 break; 798 } 799 800 case ICMP6_WRUREPLY: 801 if (code != 0) 802 goto badcode; 803 break; 804 805 case ND_ROUTER_SOLICIT: 806 icmp6_ifstat_inc(rcvif, ifs6_in_routersolicit); 807 if (code != 0) 808 goto badcode; 809 if (icmp6len < sizeof(struct nd_router_solicit)) 810 goto badlen; 811 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 812 /* give up local */ 813 nd6_rs_input(m, off, icmp6len); 814 m = NULL; 815 goto freeit; 816 } 817 nd6_rs_input(n, off, icmp6len); 818 /* m stays. */ 819 break; 820 821 case ND_ROUTER_ADVERT: 822 icmp6_ifstat_inc(rcvif, ifs6_in_routeradvert); 823 if (code != 0) 824 goto badcode; 825 if (icmp6len < sizeof(struct nd_router_advert)) 826 goto badlen; 827 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 828 /* give up local */ 829 nd6_ra_input(m, off, icmp6len); 830 m = NULL; 831 goto freeit; 832 } 833 nd6_ra_input(n, off, icmp6len); 834 /* m stays. */ 835 break; 836 837 case ND_NEIGHBOR_SOLICIT: 838 icmp6_ifstat_inc(rcvif, ifs6_in_neighborsolicit); 839 if (code != 0) 840 goto badcode; 841 if (icmp6len < sizeof(struct nd_neighbor_solicit)) 842 goto badlen; 843 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 844 /* give up local */ 845 nd6_ns_input(m, off, icmp6len); 846 m = NULL; 847 goto freeit; 848 } 849 nd6_ns_input(n, off, icmp6len); 850 /* m stays. */ 851 break; 852 853 case ND_NEIGHBOR_ADVERT: 854 icmp6_ifstat_inc(rcvif, ifs6_in_neighboradvert); 855 if (code != 0) 856 goto badcode; 857 if (icmp6len < sizeof(struct nd_neighbor_advert)) 858 goto badlen; 859 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 860 /* give up local */ 861 nd6_na_input(m, off, icmp6len); 862 m = NULL; 863 goto freeit; 864 } 865 nd6_na_input(n, off, icmp6len); 866 /* m stays. */ 867 break; 868 869 case ND_REDIRECT: 870 icmp6_ifstat_inc(rcvif, ifs6_in_redirect); 871 if (code != 0) 872 goto badcode; 873 if (icmp6len < sizeof(struct nd_redirect)) 874 goto badlen; 875 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 876 /* give up local */ 877 icmp6_redirect_input(m, off); 878 m = NULL; 879 goto freeit; 880 } 881 icmp6_redirect_input(n, off); 882 /* m stays. */ 883 break; 884 885 case ICMP6_ROUTER_RENUMBERING: 886 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND && 887 code != ICMP6_ROUTER_RENUMBERING_RESULT) 888 goto badcode; 889 if (icmp6len < sizeof(struct icmp6_router_renum)) 890 goto badlen; 891 break; 892 893 default: 894 nd6log(LOG_DEBUG, 895 "unknown type %d(src=%s, dst=%s, ifid=%d)\n", 896 icmp6->icmp6_type, 897 IN6_PRINT(ip6buf, &ip6->ip6_src), 898 IN6_PRINT(ip6buf2, &ip6->ip6_dst), 899 rcvif ? rcvif->if_index : 0); 900 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) { 901 /* ICMPv6 error: MUST deliver it by spec... */ 902 code = PRC_NCMDS; 903 /* deliver */ 904 } else { 905 /* ICMPv6 informational: MUST not deliver */ 906 break; 907 } 908 deliver: 909 if (icmp6_notify_error(m, off, icmp6len, code)) { 910 /* In this case, m should've been freed. */ 911 m_put_rcvif_psref(rcvif, &psref); 912 return; 913 } 914 break; 915 916 badcode: 917 ICMP6_STATINC(ICMP6_STAT_BADCODE); 918 break; 919 920 badlen: 921 ICMP6_STATINC(ICMP6_STAT_BADLEN); 922 break; 923 } 924 m_put_rcvif_psref(rcvif, &psref); 925 926 /* deliver the packet to appropriate sockets */ 927 icmp6_rip6_input(&m, off); 928 929 return; 930 931 freeit: 932 m_put_rcvif_psref(rcvif, &psref); 933 m_freem(m); 934 return; 935} 936 937int 938icmp6_input(struct mbuf **mp, int *offp, int proto) 939{ 940 941 wqinput_input(icmp6_wqinput, *mp, *offp, proto); 942 943 return IPPROTO_DONE; 944} 945 946static int 947icmp6_notify_error(struct mbuf *m, int off, int icmp6len, int code) 948{ 949 struct icmp6_hdr *icmp6; 950 struct ip6_hdr *eip6; 951 u_int32_t notifymtu; 952 struct sockaddr_in6 icmp6src, icmp6dst; 953 954 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) { 955 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 956 goto freeit; 957 } 958 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 959 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 960 if (icmp6 == NULL) { 961 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 962 return (-1); 963 } 964 eip6 = (struct ip6_hdr *)(icmp6 + 1); 965 966 /* Detect the upper level protocol */ 967 { 968 void (*ctlfunc)(int, struct sockaddr *, void *); 969 u_int8_t nxt = eip6->ip6_nxt; 970 int eoff = off + sizeof(struct icmp6_hdr) + 971 sizeof(struct ip6_hdr); 972 struct ip6ctlparam ip6cp; 973 struct in6_addr *finaldst = NULL; 974 int icmp6type = icmp6->icmp6_type; 975 struct ip6_frag *fh; 976 struct ip6_rthdr *rth; 977 struct ip6_rthdr0 *rth0; 978 int rthlen; 979 struct ifnet *rcvif; 980 int s; 981 982 while (1) { /* XXX: should avoid infinite loop explicitly? */ 983 struct ip6_ext *eh; 984 985 switch (nxt) { 986 case IPPROTO_HOPOPTS: 987 case IPPROTO_DSTOPTS: 988 case IPPROTO_AH: 989 IP6_EXTHDR_GET(eh, struct ip6_ext *, m, 990 eoff, sizeof(*eh)); 991 if (eh == NULL) { 992 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 993 return (-1); 994 } 995 996 if (nxt == IPPROTO_AH) 997 eoff += (eh->ip6e_len + 2) << 2; 998 else 999 eoff += (eh->ip6e_len + 1) << 3; 1000 nxt = eh->ip6e_nxt; 1001 break; 1002 case IPPROTO_ROUTING: 1003 /* 1004 * When the erroneous packet contains a 1005 * routing header, we should examine the 1006 * header to determine the final destination. 1007 * Otherwise, we can't properly update 1008 * information that depends on the final 1009 * destination (e.g. path MTU). 1010 */ 1011 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m, 1012 eoff, sizeof(*rth)); 1013 if (rth == NULL) { 1014 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 1015 return (-1); 1016 } 1017 rthlen = (rth->ip6r_len + 1) << 3; 1018 /* 1019 * XXX: currently there is no 1020 * officially defined type other 1021 * than type-0. 1022 * Note that if the segment left field 1023 * is 0, all intermediate hops must 1024 * have been passed. 1025 */ 1026 if (rth->ip6r_segleft && 1027 rth->ip6r_type == IPV6_RTHDR_TYPE_0) { 1028 int hops; 1029 1030 IP6_EXTHDR_GET(rth0, 1031 struct ip6_rthdr0 *, m, 1032 eoff, rthlen); 1033 if (rth0 == NULL) { 1034 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 1035 return (-1); 1036 } 1037 /* just ignore a bogus header */ 1038 if ((rth0->ip6r0_len % 2) == 0 && 1039 (hops = rth0->ip6r0_len/2)) 1040 finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1); 1041 } 1042 eoff += rthlen; 1043 nxt = rth->ip6r_nxt; 1044 break; 1045 case IPPROTO_FRAGMENT: 1046 IP6_EXTHDR_GET(fh, struct ip6_frag *, m, 1047 eoff, sizeof(*fh)); 1048 if (fh == NULL) { 1049 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 1050 return (-1); 1051 } 1052 /* 1053 * Data after a fragment header is meaningless 1054 * unless it is the first fragment, but 1055 * we'll go to the notify label for path MTU 1056 * discovery. 1057 */ 1058 if (fh->ip6f_offlg & IP6F_OFF_MASK) 1059 goto notify; 1060 1061 eoff += sizeof(struct ip6_frag); 1062 nxt = fh->ip6f_nxt; 1063 break; 1064 default: 1065 /* 1066 * This case includes ESP and the No Next 1067 * Header. In such cases going to the notify 1068 * label does not have any meaning 1069 * (i.e. ctlfunc will be NULL), but we go 1070 * anyway since we might have to update 1071 * path MTU information. 1072 */ 1073 goto notify; 1074 } 1075 } 1076 notify: 1077 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 1078 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 1079 if (icmp6 == NULL) { 1080 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 1081 return (-1); 1082 } 1083 1084 /* 1085 * retrieve parameters from the inner IPv6 header, and convert 1086 * them into sockaddr structures. 1087 * XXX: there is no guarantee that the source or destination 1088 * addresses of the inner packet are in the same scope zone as 1089 * the addresses of the icmp packet. But there is no other 1090 * way to determine the zone. 1091 */ 1092 eip6 = (struct ip6_hdr *)(icmp6 + 1); 1093 1094 rcvif = m_get_rcvif(m, &s); 1095 if (__predict_false(rcvif == NULL)) 1096 goto freeit; 1097 sockaddr_in6_init(&icmp6dst, 1098 (finaldst == NULL) ? &eip6->ip6_dst : finaldst, 0, 0, 0); 1099 if (in6_setscope(&icmp6dst.sin6_addr, rcvif, NULL)) { 1100 m_put_rcvif(rcvif, &s); 1101 goto freeit; 1102 } 1103 sockaddr_in6_init(&icmp6src, &eip6->ip6_src, 0, 0, 0); 1104 if (in6_setscope(&icmp6src.sin6_addr, rcvif, NULL)) { 1105 m_put_rcvif(rcvif, &s); 1106 goto freeit; 1107 } 1108 m_put_rcvif(rcvif, &s); 1109 1110 icmp6src.sin6_flowinfo = 1111 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK); 1112 1113 if (finaldst == NULL) 1114 finaldst = &eip6->ip6_dst; 1115 ip6cp.ip6c_m = m; 1116 ip6cp.ip6c_icmp6 = icmp6; 1117 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1); 1118 ip6cp.ip6c_off = eoff; 1119 ip6cp.ip6c_finaldst = finaldst; 1120 ip6cp.ip6c_src = &icmp6src; 1121 ip6cp.ip6c_nxt = nxt; 1122 1123 if (icmp6type == ICMP6_PACKET_TOO_BIG) { 1124 notifymtu = ntohl(icmp6->icmp6_mtu); 1125 ip6cp.ip6c_cmdarg = (void *)¬ifymtu; 1126 } 1127 1128 ctlfunc = (void (*)(int, struct sockaddr *, void *)) 1129 (inet6sw[ip6_protox[nxt]].pr_ctlinput); 1130 if (ctlfunc) { 1131 (void) (*ctlfunc)(code, sin6tosa(&icmp6dst), 1132 &ip6cp); 1133 } 1134 } 1135 return (0); 1136 1137 freeit: 1138 m_freem(m); 1139 return (-1); 1140} 1141 1142void 1143icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated) 1144{ 1145 unsigned long rtcount; 1146 struct icmp6_mtudisc_callback *mc; 1147 struct in6_addr *dst = ip6cp->ip6c_finaldst; 1148 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6; 1149 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */ 1150 u_int mtu = ntohl(icmp6->icmp6_mtu); 1151 struct rtentry *rt = NULL; 1152 struct sockaddr_in6 sin6; 1153 struct ifnet *rcvif; 1154 int s; 1155 1156 /* 1157 * The MTU should not be less than the minimal IPv6 MTU except for the 1158 * hack in ip6_output/ip6_setpmtu where we always include a frag header. 1159 * In that one case, the MTU might be less than 1280. 1160 */ 1161 if (__predict_false(mtu < IPV6_MMTU - sizeof(struct ip6_frag))) { 1162 /* is the mtu even sane? */ 1163 if (mtu < sizeof(struct ip6_hdr) + sizeof(struct ip6_frag) + 8) 1164 return; 1165 if (!validated) 1166 return; 1167 mtu = IPV6_MMTU - sizeof(struct ip6_frag); 1168 } 1169 1170 /* 1171 * allow non-validated cases if memory is plenty, to make traffic 1172 * from non-connected pcb happy. 1173 */ 1174 mutex_enter(&icmp6_mtx); 1175 rtcount = rt_timer_count(icmp6_mtudisc_timeout_q); 1176 if (validated) { 1177 if (0 <= icmp6_mtudisc_hiwat && rtcount > icmp6_mtudisc_hiwat) { 1178 mutex_exit(&icmp6_mtx); 1179 return; 1180 } 1181 else if (0 <= icmp6_mtudisc_lowat && 1182 rtcount > icmp6_mtudisc_lowat) { 1183 /* 1184 * XXX nuke a victim, install the new one. 1185 */ 1186 } 1187 } else { 1188 if (0 <= icmp6_mtudisc_lowat && rtcount > icmp6_mtudisc_lowat) { 1189 mutex_exit(&icmp6_mtx); 1190 return; 1191 } 1192 } 1193 mutex_exit(&icmp6_mtx); 1194 1195 memset(&sin6, 0, sizeof(sin6)); 1196 sin6.sin6_family = PF_INET6; 1197 sin6.sin6_len = sizeof(struct sockaddr_in6); 1198 sin6.sin6_addr = *dst; 1199 rcvif = m_get_rcvif(m, &s); 1200 if (__predict_false(rcvif == NULL)) 1201 return; 1202 if (in6_setscope(&sin6.sin6_addr, rcvif, NULL)) { 1203 m_put_rcvif(rcvif, &s); 1204 return; 1205 } 1206 m_put_rcvif(rcvif, &s); 1207 1208 rt = icmp6_mtudisc_clone(sin6tosa(&sin6)); 1209 1210 if (rt && (rt->rt_flags & RTF_HOST) && 1211 !(rt->rt_rmx.rmx_locks & RTV_MTU) && 1212 (rt->rt_rmx.rmx_mtu > mtu || rt->rt_rmx.rmx_mtu == 0)) { 1213 if (mtu < IN6_LINKMTU(rt->rt_ifp)) { 1214 ICMP6_STATINC(ICMP6_STAT_PMTUCHG); 1215 rt->rt_rmx.rmx_mtu = mtu; 1216 } 1217 } 1218 if (rt) { 1219 rt_unref(rt); 1220 } 1221 1222 /* 1223 * Notify protocols that the MTU for this destination 1224 * has changed. 1225 */ 1226 mutex_enter(&icmp6_mtx); 1227 for (mc = LIST_FIRST(&icmp6_mtudisc_callbacks); mc != NULL; 1228 mc = LIST_NEXT(mc, mc_list)) 1229 (*mc->mc_func)(&sin6.sin6_addr); 1230 mutex_exit(&icmp6_mtx); 1231} 1232 1233/* 1234 * Process a Node Information Query packet, based on 1235 * draft-ietf-ipngwg-icmp-name-lookups-07. 1236 * 1237 * Spec incompatibilities: 1238 * - IPv6 Subject address handling 1239 * - IPv4 Subject address handling support missing 1240 * - Proxy reply (answer even if it's not for me) 1241 * - joins NI group address at in6_ifattach() time only, does not cope 1242 * with hostname changes by sethostname(3) 1243 */ 1244static struct mbuf * 1245ni6_input(struct mbuf *m, int off) 1246{ 1247 struct icmp6_nodeinfo *ni6, *nni6; 1248 struct mbuf *n = NULL; 1249 u_int16_t qtype; 1250 int subjlen; 1251 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1252 struct ni_reply_fqdn *fqdn; 1253 int addrs; /* for NI_QTYPE_NODEADDR */ 1254 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */ 1255 struct sockaddr_in6 sin6; /* ip6_dst */ 1256 struct in6_addr in6_subj; /* subject address */ 1257 struct ip6_hdr *ip6; 1258 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */ 1259 char *subj = NULL; 1260 struct ifnet *rcvif; 1261 int s, ss; 1262 struct ifaddr *ifa; 1263 struct psref psref; 1264 1265 ip6 = mtod(m, struct ip6_hdr *); 1266 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6)); 1267 if (ni6 == NULL) { 1268 /* m is already reclaimed */ 1269 return NULL; 1270 } 1271 1272 /* 1273 * Validate IPv6 destination address. 1274 * 1275 * The Responder must discard the Query without further processing 1276 * unless it is one of the Responder's unicast or anycast addresses, or 1277 * a link-local scope multicast address which the Responder has joined. 1278 * [icmp-name-lookups-07, Section 4.] 1279 */ 1280 sockaddr_in6_init(&sin6, &ip6->ip6_dst, 0, 0, 0); 1281 /* XXX scopeid */ 1282 ss = pserialize_read_enter(); 1283 ifa = ifa_ifwithaddr(sin6tosa(&sin6)); 1284 if (ifa != NULL) 1285 ; /* unicast/anycast, fine */ 1286 else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr)) 1287 ; /* link-local multicast, fine */ 1288 else { 1289 pserialize_read_exit(ss); 1290 goto bad; 1291 } 1292 pserialize_read_exit(ss); 1293 1294 /* validate query Subject field. */ 1295 qtype = ntohs(ni6->ni_qtype); 1296 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo); 1297 switch (qtype) { 1298 case NI_QTYPE_NOOP: 1299 case NI_QTYPE_SUPTYPES: 1300 /* 07 draft */ 1301 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0) 1302 break; 1303 /* FALLTHROUGH */ 1304 case NI_QTYPE_FQDN: 1305 case NI_QTYPE_NODEADDR: 1306 case NI_QTYPE_IPV4ADDR: 1307 switch (ni6->ni_code) { 1308 case ICMP6_NI_SUBJ_IPV6: 1309#if ICMP6_NI_SUBJ_IPV6 != 0 1310 case 0: 1311#endif 1312 /* 1313 * backward compatibility - try to accept 03 draft 1314 * format, where no Subject is present. 1315 */ 1316 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 && 1317 subjlen == 0) { 1318 oldfqdn++; 1319 break; 1320 } 1321#if ICMP6_NI_SUBJ_IPV6 != 0 1322 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6) 1323 goto bad; 1324#endif 1325 1326 if (subjlen != sizeof(sin6.sin6_addr)) 1327 goto bad; 1328 1329 /* 1330 * Validate Subject address. 1331 * 1332 * Not sure what exactly "address belongs to the node" 1333 * means in the spec, is it just unicast, or what? 1334 * 1335 * At this moment we consider Subject address as 1336 * "belong to the node" if the Subject address equals 1337 * to the IPv6 destination address; validation for 1338 * IPv6 destination address should have done enough 1339 * check for us. 1340 * 1341 * We do not do proxy at this moment. 1342 */ 1343 /* m_pulldown instead of copy? */ 1344 m_copydata(m, off + sizeof(struct icmp6_nodeinfo), 1345 subjlen, (void *)&in6_subj); 1346 rcvif = m_get_rcvif(m, &s); 1347 if (__predict_false(rcvif == NULL)) 1348 goto bad; 1349 if (in6_setscope(&in6_subj, rcvif, NULL)) { 1350 m_put_rcvif(rcvif, &s); 1351 goto bad; 1352 } 1353 m_put_rcvif(rcvif, &s); 1354 1355 subj = (char *)&in6_subj; 1356 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &in6_subj)) 1357 break; 1358 1359 /* 1360 * XXX if we are to allow other cases, we should really 1361 * be careful about scope here. 1362 * basically, we should disallow queries toward IPv6 1363 * destination X with subject Y, if scope(X) > scope(Y). 1364 * if we allow scope(X) > scope(Y), it will result in 1365 * information leakage across scope boundary. 1366 */ 1367 goto bad; 1368 1369 case ICMP6_NI_SUBJ_FQDN: 1370 /* 1371 * Validate Subject name with gethostname(3). 1372 * 1373 * The behavior may need some debate, since: 1374 * - we are not sure if the node has FQDN as 1375 * hostname (returned by gethostname(3)). 1376 * - the code does wildcard match for truncated names. 1377 * however, we are not sure if we want to perform 1378 * wildcard match, if gethostname(3) side has 1379 * truncated hostname. 1380 */ 1381 n = ni6_nametodns(hostname, hostnamelen, 0); 1382 if (!n || n->m_next || n->m_len == 0) 1383 goto bad; 1384 IP6_EXTHDR_GET(subj, char *, m, 1385 off + sizeof(struct icmp6_nodeinfo), subjlen); 1386 if (subj == NULL) 1387 goto bad; 1388 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *), 1389 n->m_len)) { 1390 goto bad; 1391 } 1392 m_freem(n); 1393 n = NULL; 1394 break; 1395 1396 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */ 1397 default: 1398 goto bad; 1399 } 1400 break; 1401 } 1402 1403 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */ 1404 switch (qtype) { 1405 case NI_QTYPE_FQDN: 1406 if ((icmp6_nodeinfo & 1) == 0) 1407 goto bad; 1408 break; 1409 case NI_QTYPE_NODEADDR: 1410 case NI_QTYPE_IPV4ADDR: 1411 if ((icmp6_nodeinfo & 2) == 0) 1412 goto bad; 1413 break; 1414 } 1415 1416 /* guess reply length */ 1417 switch (qtype) { 1418 case NI_QTYPE_NOOP: 1419 break; /* no reply data */ 1420 case NI_QTYPE_SUPTYPES: 1421 replylen += sizeof(u_int32_t); 1422 break; 1423 case NI_QTYPE_FQDN: 1424 /* XXX will append an mbuf */ 1425 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1426 break; 1427 case NI_QTYPE_NODEADDR: 1428 addrs = ni6_addrs(ni6, m, &ifp, subj, &psref); 1429 if ((replylen += addrs * (sizeof(struct in6_addr) + 1430 sizeof(u_int32_t))) > MCLBYTES) 1431 replylen = MCLBYTES; /* XXX: will truncate pkt later */ 1432 break; 1433 case NI_QTYPE_IPV4ADDR: 1434 /* unsupported - should respond with unknown Qtype? */ 1435 goto bad; 1436 default: 1437 /* 1438 * XXX: We must return a reply with the ICMP6 code 1439 * `unknown Qtype' in this case. However we regard the case 1440 * as an FQDN query for backward compatibility. 1441 * Older versions set a random value to this field, 1442 * so it rarely varies in the defined qtypes. 1443 * But the mechanism is not reliable... 1444 * maybe we should obsolete older versions. 1445 */ 1446 qtype = NI_QTYPE_FQDN; 1447 /* XXX will append an mbuf */ 1448 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1449 oldfqdn++; 1450 break; 1451 } 1452 1453 /* allocate an mbuf to reply. */ 1454 MGETHDR(n, M_DONTWAIT, m->m_type); 1455 if (n == NULL) { 1456 if_put(ifp, &psref); 1457 m_freem(m); 1458 return (NULL); 1459 } 1460 M_MOVE_PKTHDR(n, m); /* just for rcvif */ 1461 if (replylen > MHLEN) { 1462 if (replylen > MCLBYTES) { 1463 /* 1464 * XXX: should we try to allocate more? But MCLBYTES 1465 * is probably much larger than IPV6_MMTU... 1466 */ 1467 goto bad; 1468 } 1469 MCLGET(n, M_DONTWAIT); 1470 if ((n->m_flags & M_EXT) == 0) { 1471 goto bad; 1472 } 1473 } 1474 n->m_pkthdr.len = n->m_len = replylen; 1475 1476 /* copy mbuf header and IPv6 + Node Information base headers */ 1477 bcopy(mtod(m, void *), mtod(n, void *), sizeof(struct ip6_hdr)); 1478 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1); 1479 bcopy((void *)ni6, (void *)nni6, sizeof(struct icmp6_nodeinfo)); 1480 1481 /* qtype dependent procedure */ 1482 switch (qtype) { 1483 case NI_QTYPE_NOOP: 1484 nni6->ni_code = ICMP6_NI_SUCCESS; 1485 nni6->ni_flags = 0; 1486 break; 1487 case NI_QTYPE_SUPTYPES: 1488 { 1489 u_int32_t v; 1490 nni6->ni_code = ICMP6_NI_SUCCESS; 1491 nni6->ni_flags = htons(0x0000); /* raw bitmap */ 1492 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */ 1493 v = (u_int32_t)htonl(0x0000000f); 1494 bcopy(&v, nni6 + 1, sizeof(u_int32_t)); 1495 break; 1496 } 1497 case NI_QTYPE_FQDN: 1498 nni6->ni_code = ICMP6_NI_SUCCESS; 1499 fqdn = (struct ni_reply_fqdn *)(mtod(n, char *) + 1500 sizeof(struct ip6_hdr) + 1501 sizeof(struct icmp6_nodeinfo)); 1502 nni6->ni_flags = 0; /* XXX: meaningless TTL */ 1503 fqdn->ni_fqdn_ttl = 0; /* ditto. */ 1504 /* 1505 * XXX do we really have FQDN in variable "hostname"? 1506 */ 1507 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn); 1508 if (n->m_next == NULL) 1509 goto bad; 1510 /* XXX we assume that n->m_next is not a chain */ 1511 if (n->m_next->m_next != NULL) 1512 goto bad; 1513 n->m_pkthdr.len += n->m_next->m_len; 1514 break; 1515 case NI_QTYPE_NODEADDR: 1516 { 1517 int lenlim, copied; 1518 1519 nni6->ni_code = ICMP6_NI_SUCCESS; 1520 n->m_pkthdr.len = n->m_len = 1521 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1522 lenlim = M_TRAILINGSPACE(n); 1523 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim); 1524 if_put(ifp, &psref); 1525 ifp = NULL; 1526 /* XXX: reset mbuf length */ 1527 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 1528 sizeof(struct icmp6_nodeinfo) + copied; 1529 break; 1530 } 1531 default: 1532 break; /* XXX impossible! */ 1533 } 1534 1535 nni6->ni_type = ICMP6_NI_REPLY; 1536 m_freem(m); 1537 return (n); 1538 1539 bad: 1540 if_put(ifp, &psref); 1541 m_freem(m); 1542 if (n) 1543 m_freem(n); 1544 return (NULL); 1545} 1546#undef hostnamelen 1547 1548#define isupper(x) ('A' <= (x) && (x) <= 'Z') 1549#define isalpha(x) (('A' <= (x) && (x) <= 'Z') || ('a' <= (x) && (x) <= 'z')) 1550#define isalnum(x) (isalpha(x) || ('0' <= (x) && (x) <= '9')) 1551#define tolower(x) (isupper(x) ? (x) + 'a' - 'A' : (x)) 1552 1553/* 1554 * make a mbuf with DNS-encoded string. no compression support. 1555 * 1556 * XXX names with less than 2 dots (like "foo" or "foo.section") will be 1557 * treated as truncated name (two \0 at the end). this is a wild guess. 1558 * 1559 * old - return pascal string if non-zero 1560 */ 1561static struct mbuf * 1562ni6_nametodns(const char *name, int namelen, int old) 1563{ 1564 struct mbuf *m; 1565 char *cp, *ep; 1566 const char *p, *q; 1567 int i, len, nterm; 1568 1569 if (old) 1570 len = namelen + 1; 1571 else 1572 len = MCLBYTES; 1573 1574 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */ 1575 MGET(m, M_DONTWAIT, MT_DATA); 1576 if (m && len > MLEN) { 1577 MCLGET(m, M_DONTWAIT); 1578 if ((m->m_flags & M_EXT) == 0) 1579 goto fail; 1580 } 1581 if (!m) 1582 goto fail; 1583 m->m_next = NULL; 1584 1585 if (old) { 1586 m->m_len = len; 1587 *mtod(m, char *) = namelen; 1588 bcopy(name, mtod(m, char *) + 1, namelen); 1589 return m; 1590 } else { 1591 m->m_len = 0; 1592 cp = mtod(m, char *); 1593 ep = mtod(m, char *) + M_TRAILINGSPACE(m); 1594 1595 /* if not certain about my name, return empty buffer */ 1596 if (namelen == 0) 1597 return m; 1598 1599 /* 1600 * guess if it looks like shortened hostname, or FQDN. 1601 * shortened hostname needs two trailing "\0". 1602 */ 1603 i = 0; 1604 for (p = name; p < name + namelen; p++) { 1605 if (*p == '.') 1606 i++; 1607 } 1608 if (i < 2) 1609 nterm = 2; 1610 else 1611 nterm = 1; 1612 1613 p = name; 1614 while (cp < ep && p < name + namelen) { 1615 i = 0; 1616 for (q = p; q < name + namelen && *q && *q != '.'; q++) 1617 i++; 1618 /* result does not fit into mbuf */ 1619 if (cp + i + 1 >= ep) 1620 goto fail; 1621 /* 1622 * DNS label length restriction, RFC1035 page 8. 1623 * "i == 0" case is included here to avoid returning 1624 * 0-length label on "foo..bar". 1625 */ 1626 if (i <= 0 || i >= 64) 1627 goto fail; 1628 *cp++ = i; 1629 if (!isalpha(p[0]) || !isalnum(p[i - 1])) 1630 goto fail; 1631 while (i > 0) { 1632 if (!isalnum(*p) && *p != '-') 1633 goto fail; 1634 if (isupper(*p)) { 1635 *cp++ = tolower(*p); 1636 p++; 1637 } else 1638 *cp++ = *p++; 1639 i--; 1640 } 1641 p = q; 1642 if (p < name + namelen && *p == '.') 1643 p++; 1644 } 1645 /* termination */ 1646 if (cp + nterm >= ep) 1647 goto fail; 1648 while (nterm-- > 0) 1649 *cp++ = '\0'; 1650 m->m_len = cp - mtod(m, char *); 1651 return m; 1652 } 1653 1654 panic("should not reach here"); 1655 /* NOTREACHED */ 1656 1657 fail: 1658 if (m) 1659 m_freem(m); 1660 return NULL; 1661} 1662 1663/* 1664 * check if two DNS-encoded string matches. takes care of truncated 1665 * form (with \0\0 at the end). no compression support. 1666 * XXX upper/lowercase match (see RFC2065) 1667 */ 1668static int 1669ni6_dnsmatch(const char *a, int alen, const char *b, int blen) 1670{ 1671 const char *a0, *b0; 1672 int l; 1673 1674 /* simplest case - need validation? */ 1675 if (alen == blen && memcmp(a, b, alen) == 0) 1676 return 1; 1677 1678 a0 = a; 1679 b0 = b; 1680 1681 /* termination is mandatory */ 1682 if (alen < 2 || blen < 2) 1683 return 0; 1684 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0') 1685 return 0; 1686 alen--; 1687 blen--; 1688 1689 while (a - a0 < alen && b - b0 < blen) { 1690 if (a - a0 + 1 > alen || b - b0 + 1 > blen) 1691 return 0; 1692 1693 if ((signed char)a[0] < 0 || (signed char)b[0] < 0) 1694 return 0; 1695 /* we don't support compression yet */ 1696 if (a[0] >= 64 || b[0] >= 64) 1697 return 0; 1698 1699 /* truncated case */ 1700 if (a[0] == 0 && a - a0 == alen - 1) 1701 return 1; 1702 if (b[0] == 0 && b - b0 == blen - 1) 1703 return 1; 1704 if (a[0] == 0 || b[0] == 0) 1705 return 0; 1706 1707 if (a[0] != b[0]) 1708 return 0; 1709 l = a[0]; 1710 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen) 1711 return 0; 1712 if (memcmp(a + 1, b + 1, l) != 0) 1713 return 0; 1714 1715 a += 1 + l; 1716 b += 1 + l; 1717 } 1718 1719 if (a - a0 == alen && b - b0 == blen) 1720 return 1; 1721 else 1722 return 0; 1723} 1724 1725/* 1726 * calculate the number of addresses to be returned in the node info reply. 1727 */ 1728static int 1729ni6_addrs(struct icmp6_nodeinfo *ni6, struct mbuf *m, 1730 struct ifnet **ifpp, char *subj, struct psref *psref) 1731{ 1732 struct ifnet *ifp; 1733 struct in6_ifaddr *ia6; 1734 struct ifaddr *ifa; 1735 struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */ 1736 int addrs = 0, addrsofif, iffound = 0; 1737 int niflags = ni6->ni_flags; 1738 int s; 1739 1740 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) { 1741 switch (ni6->ni_code) { 1742 case ICMP6_NI_SUBJ_IPV6: 1743 if (subj == NULL) /* must be impossible... */ 1744 return (0); 1745 subj_ip6 = (struct sockaddr_in6 *)subj; 1746 break; 1747 default: 1748 /* 1749 * XXX: we only support IPv6 subject address for 1750 * this Qtype. 1751 */ 1752 return (0); 1753 } 1754 } 1755 1756 s = pserialize_read_enter(); 1757 IFNET_READER_FOREACH(ifp) { 1758 addrsofif = 0; 1759 IFADDR_READER_FOREACH(ifa, ifp) { 1760 if (ifa->ifa_addr->sa_family != AF_INET6) 1761 continue; 1762 ia6 = (struct in6_ifaddr *)ifa; 1763 1764 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 && 1765 IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr, 1766 &ia6->ia_addr.sin6_addr)) 1767 iffound = 1; 1768 1769 /* 1770 * IPv4-mapped addresses can only be returned by a 1771 * Node Information proxy, since they represent 1772 * addresses of IPv4-only nodes, which perforce do 1773 * not implement this protocol. 1774 * [icmp-name-lookups-07, Section 5.4] 1775 * So we don't support NI_NODEADDR_FLAG_COMPAT in 1776 * this function at this moment. 1777 */ 1778 1779 /* What do we have to do about ::1? */ 1780 switch (in6_addrscope(&ia6->ia_addr.sin6_addr)) { 1781 case IPV6_ADDR_SCOPE_LINKLOCAL: 1782 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1783 continue; 1784 break; 1785 case IPV6_ADDR_SCOPE_SITELOCAL: 1786 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1787 continue; 1788 break; 1789 case IPV6_ADDR_SCOPE_GLOBAL: 1790 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1791 continue; 1792 break; 1793 default: 1794 continue; 1795 } 1796 1797 /* 1798 * check if anycast is okay. 1799 * XXX: just experimental. not in the spec. 1800 */ 1801 if ((ia6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1802 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 1803 continue; /* we need only unicast addresses */ 1804 1805 addrsofif++; /* count the address */ 1806 } 1807 if (iffound) { 1808 if_acquire(ifp, psref); 1809 pserialize_read_exit(s); 1810 *ifpp = ifp; 1811 return (addrsofif); 1812 } 1813 1814 addrs += addrsofif; 1815 } 1816 pserialize_read_exit(s); 1817 1818 return (addrs); 1819} 1820 1821static int 1822ni6_store_addrs(struct icmp6_nodeinfo *ni6, 1823 struct icmp6_nodeinfo *nni6, struct ifnet *ifp0, 1824 int resid) 1825{ 1826 struct ifnet *ifp; 1827 struct in6_ifaddr *ia6; 1828 struct ifaddr *ifa; 1829 struct ifnet *ifp_dep = NULL; 1830 int copied = 0, allow_deprecated = 0; 1831 u_char *cp = (u_char *)(nni6 + 1); 1832 int niflags = ni6->ni_flags; 1833 u_int32_t ltime; 1834 int s; 1835 1836 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL)) 1837 return (0); /* needless to copy */ 1838 1839 s = pserialize_read_enter(); 1840 ifp = ifp0 ? ifp0 : IFNET_READER_FIRST(); 1841 again: 1842 1843 for (; ifp; ifp = IFNET_READER_NEXT(ifp)) 1844 { 1845 IFADDR_READER_FOREACH(ifa, ifp) { 1846 if (ifa->ifa_addr->sa_family != AF_INET6) 1847 continue; 1848 ia6 = (struct in6_ifaddr *)ifa; 1849 1850 if ((ia6->ia6_flags & IN6_IFF_DEPRECATED) != 0 && 1851 allow_deprecated == 0) { 1852 /* 1853 * prefererred address should be put before 1854 * deprecated addresses. 1855 */ 1856 1857 /* record the interface for later search */ 1858 if (ifp_dep == NULL) 1859 ifp_dep = ifp; 1860 1861 continue; 1862 } 1863 else if ((ia6->ia6_flags & IN6_IFF_DEPRECATED) == 0 && 1864 allow_deprecated != 0) 1865 continue; /* we now collect deprecated addrs */ 1866 1867 /* What do we have to do about ::1? */ 1868 switch (in6_addrscope(&ia6->ia_addr.sin6_addr)) { 1869 case IPV6_ADDR_SCOPE_LINKLOCAL: 1870 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1871 continue; 1872 break; 1873 case IPV6_ADDR_SCOPE_SITELOCAL: 1874 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1875 continue; 1876 break; 1877 case IPV6_ADDR_SCOPE_GLOBAL: 1878 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1879 continue; 1880 break; 1881 default: 1882 continue; 1883 } 1884 1885 /* 1886 * check if anycast is okay. 1887 * XXX: just experimental. not in the spec. 1888 */ 1889 if ((ia6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1890 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 1891 continue; 1892 1893 /* now we can copy the address */ 1894 if (resid < sizeof(struct in6_addr) + 1895 sizeof(u_int32_t)) { 1896 /* 1897 * We give up much more copy. 1898 * Set the truncate flag and return. 1899 */ 1900 nni6->ni_flags |= NI_NODEADDR_FLAG_TRUNCATE; 1901 goto out; 1902 } 1903 1904 /* 1905 * Set the TTL of the address. 1906 * The TTL value should be one of the following 1907 * according to the specification: 1908 * 1909 * 1. The remaining lifetime of a DHCP lease on the 1910 * address, or 1911 * 2. The remaining Valid Lifetime of a prefix from 1912 * which the address was derived through Stateless 1913 * Autoconfiguration. 1914 * 1915 * Note that we currently do not support stateful 1916 * address configuration by DHCPv6, so the former 1917 * case can't happen. 1918 * 1919 * TTL must be 2^31 > TTL >= 0. 1920 */ 1921 if (ia6->ia6_lifetime.ia6t_expire == 0) 1922 ltime = ND6_INFINITE_LIFETIME; 1923 else { 1924 if (ia6->ia6_lifetime.ia6t_expire > 1925 time_uptime) 1926 ltime = ia6->ia6_lifetime.ia6t_expire - 1927 time_uptime; 1928 else 1929 ltime = 0; 1930 } 1931 if (ltime > 0x7fffffff) 1932 ltime = 0x7fffffff; 1933 ltime = htonl(ltime); 1934 1935 bcopy(<ime, cp, sizeof(u_int32_t)); 1936 cp += sizeof(u_int32_t); 1937 1938 /* copy the address itself */ 1939 bcopy(&ia6->ia_addr.sin6_addr, cp, 1940 sizeof(struct in6_addr)); 1941 in6_clearscope((struct in6_addr *)cp); /* XXX */ 1942 cp += sizeof(struct in6_addr); 1943 1944 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1945 copied += (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1946 } 1947 if (ifp0) /* we need search only on the specified IF */ 1948 break; 1949 } 1950 1951 if (allow_deprecated == 0 && ifp_dep != NULL) { 1952 ifp = ifp_dep; 1953 allow_deprecated = 1; 1954 1955 goto again; 1956 } 1957out: 1958 pserialize_read_exit(s); 1959 return (copied); 1960} 1961 1962/* 1963 * XXX almost dup'ed code with rip6_input. 1964 */ 1965static int 1966icmp6_rip6_input(struct mbuf **mp, int off) 1967{ 1968 struct mbuf *m = *mp; 1969 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1970 struct inpcb_hdr *inph; 1971 struct in6pcb *in6p; 1972 struct in6pcb *last = NULL; 1973 struct sockaddr_in6 rip6src; 1974 struct icmp6_hdr *icmp6; 1975 struct mbuf *opts = NULL; 1976 1977 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 1978 if (icmp6 == NULL) { 1979 /* m is already reclaimed */ 1980 return IPPROTO_DONE; 1981 } 1982 1983 /* 1984 * XXX: the address may have embedded scope zone ID, which should be 1985 * hidden from applications. 1986 */ 1987 sockaddr_in6_init(&rip6src, &ip6->ip6_src, 0, 0, 0); 1988 if (sa6_recoverscope(&rip6src)) { 1989 m_freem(m); 1990 return (IPPROTO_DONE); 1991 } 1992 1993 TAILQ_FOREACH(inph, &raw6cbtable.inpt_queue, inph_queue) { 1994 in6p = (struct in6pcb *)inph; 1995 if (in6p->in6p_af != AF_INET6) 1996 continue; 1997 if (in6p->in6p_ip6.ip6_nxt != IPPROTO_ICMPV6) 1998 continue; 1999 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && 2000 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst)) 2001 continue; 2002 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) && 2003 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src)) 2004 continue; 2005 if (in6p->in6p_icmp6filt 2006 && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type, 2007 in6p->in6p_icmp6filt)) 2008 continue; 2009 if (last) { 2010 struct mbuf *n; 2011#ifdef IPSEC 2012 /* 2013 * Check AH/ESP integrity 2014 */ 2015 if (ipsec_used && !ipsec6_in_reject(m, last)) 2016#endif /* IPSEC */ 2017 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { 2018 if (last->in6p_flags & IN6P_CONTROLOPTS) 2019 ip6_savecontrol(last, &opts, ip6, n); 2020 /* strip intermediate headers */ 2021 m_adj(n, off); 2022 if (sbappendaddr(&last->in6p_socket->so_rcv, 2023 sin6tosa(&rip6src), n, opts) == 0) { 2024 /* should notify about lost packet */ 2025 m_freem(n); 2026 if (opts) 2027 m_freem(opts); 2028 } else 2029 sorwakeup(last->in6p_socket); 2030 opts = NULL; 2031 } 2032 } 2033 last = in6p; 2034 } 2035#ifdef IPSEC 2036 if (ipsec_used && last && ipsec6_in_reject(m, last)) { 2037 m_freem(m); 2038 /* 2039 * XXX ipsec6_in_reject update stat if there is an error 2040 * so we just need to update stats by hand in the case of last is 2041 * NULL 2042 */ 2043 if (!last) 2044 IPSEC6_STATINC(IPSEC_STAT_IN_POLVIO); 2045 IP6_STATDEC(IP6_STAT_DELIVERED); 2046 /* do not inject data into pcb */ 2047 } else 2048#endif /* IPSEC */ 2049 if (last) { 2050 if (last->in6p_flags & IN6P_CONTROLOPTS) 2051 ip6_savecontrol(last, &opts, ip6, m); 2052 /* strip intermediate headers */ 2053 m_adj(m, off); 2054 if (sbappendaddr(&last->in6p_socket->so_rcv, 2055 sin6tosa(&rip6src), m, opts) == 0) { 2056 m_freem(m); 2057 if (opts) 2058 m_freem(opts); 2059 } else 2060 sorwakeup(last->in6p_socket); 2061 } else { 2062 m_freem(m); 2063 IP6_STATDEC(IP6_STAT_DELIVERED); 2064 } 2065 return IPPROTO_DONE; 2066} 2067 2068/* 2069 * Reflect the ip6 packet back to the source. 2070 * OFF points to the icmp6 header, counted from the top of the mbuf. 2071 * 2072 * Note: RFC 1885 required that an echo reply should be truncated if it 2073 * did not fit in with (return) path MTU, and KAME code supported the 2074 * behavior. However, as a clarification after the RFC, this limitation 2075 * was removed in a revised version of the spec, RFC 2463. We had kept the 2076 * old behavior, with a (non-default) ifdef block, while the new version of 2077 * the spec was an internet-draft status, and even after the new RFC was 2078 * published. But it would rather make sense to clean the obsoleted part 2079 * up, and to make the code simpler at this stage. 2080 */ 2081void 2082icmp6_reflect(struct mbuf *m, size_t off) 2083{ 2084 struct ip6_hdr *ip6; 2085 struct icmp6_hdr *icmp6; 2086 const struct in6_ifaddr *ia; 2087 const struct ip6aux *ip6a; 2088 int plen; 2089 int type, code; 2090 struct ifnet *outif = NULL; 2091 struct in6_addr origdst; 2092 struct ifnet *rcvif; 2093 int s; 2094 bool ip6_src_filled = false; 2095 2096 /* too short to reflect */ 2097 if (off < sizeof(struct ip6_hdr)) { 2098 nd6log(LOG_DEBUG, 2099 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n", 2100 (u_long)off, (u_long)sizeof(struct ip6_hdr), 2101 __FILE__, __LINE__); 2102 goto bad; 2103 } 2104 2105 /* 2106 * If there are extra headers between IPv6 and ICMPv6, strip 2107 * off that header first. 2108 */ 2109 CTASSERT(sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) <= MHLEN); 2110 if (off > sizeof(struct ip6_hdr)) { 2111 size_t l; 2112 struct ip6_hdr nip6; 2113 2114 l = off - sizeof(struct ip6_hdr); 2115 m_copydata(m, 0, sizeof(nip6), (void *)&nip6); 2116 m_adj(m, l); 2117 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2118 if (m->m_len < l) { 2119 if ((m = m_pullup(m, l)) == NULL) 2120 return; 2121 } 2122 bcopy((void *)&nip6, mtod(m, void *), sizeof(nip6)); 2123 } else /* off == sizeof(struct ip6_hdr) */ { 2124 size_t l; 2125 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2126 if (m->m_len < l) { 2127 if ((m = m_pullup(m, l)) == NULL) 2128 return; 2129 } 2130 } 2131 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr); 2132 ip6 = mtod(m, struct ip6_hdr *); 2133 ip6->ip6_nxt = IPPROTO_ICMPV6; 2134 icmp6 = (struct icmp6_hdr *)(ip6 + 1); 2135 type = icmp6->icmp6_type; /* keep type for statistics */ 2136 code = icmp6->icmp6_code; /* ditto. */ 2137 2138 origdst = ip6->ip6_dst; 2139 /* 2140 * ip6_input() drops a packet if its src is multicast. 2141 * So, the src is never multicast. 2142 */ 2143 ip6->ip6_dst = ip6->ip6_src; 2144 2145 /* 2146 * If the incoming packet was addressed directly to us (i.e. unicast), 2147 * use dst as the src for the reply. 2148 * The IN6_IFF_NOTREADY case should be VERY rare, but is possible 2149 * (for example) when we encounter an error while forwarding procedure 2150 * destined to a duplicated address of ours. 2151 * Note that ip6_getdstifaddr() may fail if we are in an error handling 2152 * procedure of an outgoing packet of our own, in which case we need 2153 * to search in the ifaddr list. 2154 */ 2155 if (IN6_IS_ADDR_MULTICAST(&origdst)) 2156 ; 2157 else if ((ip6a = ip6_getdstifaddr(m)) != NULL) { 2158 if ((ip6a->ip6a_flags & 2159 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) { 2160 ip6->ip6_src = ip6a->ip6a_src; 2161 ip6_src_filled = true; 2162 } 2163 } else { 2164 union { 2165 struct sockaddr_in6 sin6; 2166 struct sockaddr sa; 2167 } u; 2168 int _s; 2169 struct ifaddr *ifa; 2170 2171 sockaddr_in6_init(&u.sin6, &origdst, 0, 0, 0); 2172 2173 _s = pserialize_read_enter(); 2174 ifa = ifa_ifwithaddr(&u.sa); 2175 2176 if (ifa != NULL) { 2177 ia = ifatoia6(ifa); 2178 if ((ia->ia6_flags & 2179 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) { 2180 ip6->ip6_src = ia->ia_addr.sin6_addr; 2181 ip6_src_filled = true; 2182 } 2183 } 2184 pserialize_read_exit(_s); 2185 } 2186 2187 if (!ip6_src_filled) { 2188 int e; 2189 struct sockaddr_in6 sin6; 2190 struct route ro; 2191 2192 /* 2193 * This case matches to multicasts, our anycast, or unicasts 2194 * that we do not own. Select a source address based on the 2195 * source address of the erroneous packet. 2196 */ 2197 /* zone ID should be embedded */ 2198 sockaddr_in6_init(&sin6, &ip6->ip6_dst, 0, 0, 0); 2199 2200 memset(&ro, 0, sizeof(ro)); 2201 e = in6_selectsrc(&sin6, NULL, NULL, &ro, NULL, NULL, NULL, 2202 &ip6->ip6_src); 2203 rtcache_free(&ro); 2204 if (e != 0) { 2205 char ip6buf[INET6_ADDRSTRLEN]; 2206 nd6log(LOG_DEBUG, 2207 "source can't be determined: " 2208 "dst=%s, error=%d\n", 2209 IN6_PRINT(ip6buf, &sin6.sin6_addr), e); 2210 goto bad; 2211 } 2212 } 2213 2214 ip6->ip6_flow = 0; 2215 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2216 ip6->ip6_vfc |= IPV6_VERSION; 2217 ip6->ip6_nxt = IPPROTO_ICMPV6; 2218 rcvif = m_get_rcvif(m, &s); 2219 if (rcvif) { 2220 /* XXX: This may not be the outgoing interface */ 2221 ip6->ip6_hlim = ND_IFINFO(rcvif)->chlim; 2222 } else 2223 ip6->ip6_hlim = ip6_defhlim; 2224 m_put_rcvif(rcvif, &s); 2225 2226 m->m_pkthdr.csum_flags = 0; 2227 icmp6->icmp6_cksum = 0; 2228 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6, 2229 sizeof(struct ip6_hdr), plen); 2230 2231 /* 2232 * XXX option handling 2233 */ 2234 2235 m->m_flags &= ~(M_BCAST|M_MCAST); 2236 2237 /* 2238 * To avoid a "too big" situation at an intermediate router 2239 * and the path MTU discovery process, specify the IPV6_MINMTU flag. 2240 * Note that only echo and node information replies are affected, 2241 * since the length of ICMP6 errors is limited to the minimum MTU. 2242 */ 2243 if (ip6_output(m, NULL, NULL, IPV6_MINMTU, NULL, NULL, &outif) 2244 != 0 && outif) 2245 icmp6_ifstat_inc(outif, ifs6_out_error); 2246 if (outif) 2247 icmp6_ifoutstat_inc(outif, type, code); 2248 2249 return; 2250 2251 bad: 2252 m_freem(m); 2253 return; 2254} 2255 2256static const char * 2257icmp6_redirect_diag(char *buf, size_t buflen, struct in6_addr *src6, struct in6_addr *dst6, 2258 struct in6_addr *tgt6) 2259{ 2260 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 2261 char ip6buft[INET6_ADDRSTRLEN]; 2262 2263 snprintf(buf, buflen, "(src=%s dst=%s tgt=%s)", 2264 IN6_PRINT(ip6bufs, src6), IN6_PRINT(ip6bufd, dst6), 2265 IN6_PRINT(ip6buft, tgt6)); 2266 return buf; 2267} 2268 2269void 2270icmp6_redirect_input(struct mbuf *m, int off) 2271{ 2272 struct ifnet *ifp; 2273 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 2274 struct nd_redirect *nd_rd; 2275 int icmp6len = ntohs(ip6->ip6_plen); 2276 char *lladdr = NULL; 2277 int lladdrlen = 0; 2278 struct rtentry *rt = NULL; 2279 int is_router; 2280 int is_onlink; 2281 struct in6_addr src6 = ip6->ip6_src; 2282 struct in6_addr redtgt6; 2283 struct in6_addr reddst6; 2284 union nd_opts ndopts; 2285 struct psref psref; 2286 char ip6buf[INET6_ADDRSTRLEN]; 2287 char diagbuf[256]; 2288 2289 ifp = m_get_rcvif_psref(m, &psref); 2290 if (ifp == NULL) 2291 goto freeit; 2292 2293 /* XXX if we are router, we don't update route by icmp6 redirect */ 2294 if (ip6_forwarding) 2295 goto freeit; 2296 if (!icmp6_rediraccept) 2297 goto freeit; 2298 2299 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len); 2300 if (nd_rd == NULL) { 2301 ICMP6_STATINC(ICMP6_STAT_TOOSHORT); 2302 m_put_rcvif_psref(ifp, &psref); 2303 return; 2304 } 2305 redtgt6 = nd_rd->nd_rd_target; 2306 reddst6 = nd_rd->nd_rd_dst; 2307 2308 if (in6_setscope(&redtgt6, ifp, NULL) || 2309 in6_setscope(&reddst6, ifp, NULL)) { 2310 goto freeit; 2311 } 2312 2313 /* validation */ 2314 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) { 2315 nd6log(LOG_ERR, 2316 "ICMP6 redirect sent from %s rejected; " 2317 "must be from linklocal\n", IN6_PRINT(ip6buf, &src6)); 2318 goto bad; 2319 } 2320 if (ip6->ip6_hlim != 255) { 2321 nd6log(LOG_ERR, 2322 "ICMP6 redirect sent from %s rejected; " 2323 "hlim=%d (must be 255)\n", 2324 IN6_PRINT(ip6buf, &src6), ip6->ip6_hlim); 2325 goto bad; 2326 } 2327 { 2328 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */ 2329 struct sockaddr_in6 sin6; 2330 struct in6_addr *gw6; 2331 2332 sockaddr_in6_init(&sin6, &reddst6, 0, 0, 0); 2333 rt = rtalloc1(sin6tosa(&sin6), 0); 2334 if (rt) { 2335 if (rt->rt_gateway == NULL || 2336 rt->rt_gateway->sa_family != AF_INET6) { 2337 nd6log(LOG_ERR, 2338 "ICMP6 redirect rejected; no route " 2339 "with inet6 gateway found for redirect dst: %s\n", 2340 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2341 &src6, &reddst6, &redtgt6)); 2342 rt_unref(rt); 2343 goto bad; 2344 } 2345 2346 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr); 2347 if (memcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) { 2348 nd6log(LOG_ERR, 2349 "ICMP6 redirect rejected; " 2350 "not equal to gw-for-src=%s (must be same): %s\n", 2351 IN6_PRINT(ip6buf, gw6), 2352 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2353 &src6, &reddst6, &redtgt6)); 2354 rt_unref(rt); 2355 goto bad; 2356 } 2357 } else { 2358 nd6log(LOG_ERR, "ICMP6 redirect rejected; " 2359 "no route found for redirect dst: %s\n", 2360 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2361 &src6, &reddst6, &redtgt6)); 2362 goto bad; 2363 } 2364 rt_unref(rt); 2365 rt = NULL; 2366 } 2367 if (IN6_IS_ADDR_MULTICAST(&reddst6)) { 2368 nd6log(LOG_ERR, "ICMP6 redirect rejected; " 2369 "redirect dst must be unicast: %s\n", 2370 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2371 &src6, &reddst6, &redtgt6)); 2372 goto bad; 2373 } 2374 2375 is_router = is_onlink = 0; 2376 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 2377 is_router = 1; /* router case */ 2378 if (memcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0) 2379 is_onlink = 1; /* on-link destination case */ 2380 if (!is_router && !is_onlink) { 2381 nd6log(LOG_ERR, "ICMP6 redirect rejected; " 2382 "neither router case nor onlink case: %s\n", 2383 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2384 &src6, &reddst6, &redtgt6)); 2385 goto bad; 2386 } 2387 /* validation passed */ 2388 2389 icmp6len -= sizeof(*nd_rd); 2390 nd6_option_init(nd_rd + 1, icmp6len, &ndopts); 2391 if (nd6_options(&ndopts) < 0) { 2392 nd6log(LOG_INFO, "invalid ND option, rejected: %s\n", 2393 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2394 &src6, &reddst6, &redtgt6)); 2395 /* nd6_options have incremented stats */ 2396 goto freeit; 2397 } 2398 2399 if (ndopts.nd_opts_tgt_lladdr) { 2400 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 2401 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 2402 } 2403 2404 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 2405 nd6log(LOG_INFO, "lladdrlen mismatch for %s " 2406 "(if %d, icmp6 packet %d): %s\n", 2407 IN6_PRINT(ip6buf, &redtgt6), 2408 ifp->if_addrlen, lladdrlen - 2, 2409 icmp6_redirect_diag(diagbuf, sizeof(diagbuf), 2410 &src6, &reddst6, &redtgt6)); 2411 goto bad; 2412 } 2413 2414 /* RFC 2461 8.3 */ 2415 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT, 2416 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER); 2417 2418 m_put_rcvif_psref(ifp, &psref); 2419 ifp = NULL; 2420 2421 if (!is_onlink) { /* better router case. perform rtredirect. */ 2422 /* perform rtredirect */ 2423 struct sockaddr_in6 sdst; 2424 struct sockaddr_in6 sgw; 2425 struct sockaddr_in6 ssrc; 2426 unsigned long rtcount; 2427 struct rtentry *newrt = NULL; 2428 2429 /* 2430 * do not install redirect route, if the number of entries 2431 * is too much (> hiwat). note that, the node (= host) will 2432 * work just fine even if we do not install redirect route 2433 * (there will be additional hops, though). 2434 */ 2435 mutex_enter(&icmp6_mtx); 2436 rtcount = rt_timer_count(icmp6_redirect_timeout_q); 2437 if (0 <= ip6_maxdynroutes && rtcount >= ip6_maxdynroutes) { 2438 mutex_exit(&icmp6_mtx); 2439 goto freeit; 2440 } 2441 if (0 <= icmp6_redirect_hiwat && rtcount > icmp6_redirect_hiwat) { 2442 mutex_exit(&icmp6_mtx); 2443 goto freeit; 2444 } else if (0 <= icmp6_redirect_lowat && 2445 rtcount > icmp6_redirect_lowat) { 2446 /* 2447 * XXX nuke a victim, install the new one. 2448 */ 2449 } 2450 2451 memset(&sdst, 0, sizeof(sdst)); 2452 memset(&sgw, 0, sizeof(sgw)); 2453 memset(&ssrc, 0, sizeof(ssrc)); 2454 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6; 2455 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len = 2456 sizeof(struct sockaddr_in6); 2457 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr)); 2458 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2459 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr)); 2460 rtredirect(sin6tosa(&sdst), sin6tosa(&sgw), NULL, 2461 RTF_GATEWAY | RTF_HOST, sin6tosa(&ssrc), 2462 &newrt); 2463 2464 if (newrt) { 2465 (void)rt_timer_add(newrt, icmp6_redirect_timeout, 2466 icmp6_redirect_timeout_q); 2467 rt_unref(newrt); 2468 } 2469 mutex_exit(&icmp6_mtx); 2470 } 2471 /* finally update cached route in each socket via pfctlinput */ 2472 { 2473 struct sockaddr_in6 sdst; 2474 2475 sockaddr_in6_init(&sdst, &reddst6, 0, 0, 0); 2476 pfctlinput(PRC_REDIRECT_HOST, sin6tosa(&sdst)); 2477#if defined(IPSEC) 2478 if (ipsec_used) 2479 key_sa_routechange(sin6tosa(&sdst)); 2480#endif 2481 } 2482 2483 freeit: 2484 if (ifp != NULL) 2485 m_put_rcvif_psref(ifp, &psref); 2486 m_freem(m); 2487 return; 2488 2489 bad: 2490 m_put_rcvif_psref(ifp, &psref); 2491 ICMP6_STATINC(ICMP6_STAT_BADREDIRECT); 2492 m_freem(m); 2493} 2494 2495void 2496icmp6_redirect_output(struct mbuf *m0, struct rtentry *rt) 2497{ 2498 struct ifnet *ifp; /* my outgoing interface */ 2499 struct in6_addr *ifp_ll6; 2500 struct in6_addr *nexthop; 2501 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */ 2502 struct mbuf *m = NULL; /* newly allocated one */ 2503 struct ip6_hdr *ip6; /* m as struct ip6_hdr */ 2504 struct nd_redirect *nd_rd; 2505 size_t maxlen; 2506 u_char *p; 2507 struct sockaddr_in6 src_sa; 2508 2509 icmp6_errcount(ICMP6_STAT_OUTERRHIST, ND_REDIRECT, 0); 2510 2511 /* if we are not router, we don't send icmp6 redirect */ 2512 if (!ip6_forwarding) 2513 goto fail; 2514 2515 /* sanity check */ 2516 KASSERT(m0 != NULL); 2517 KASSERT(rt != NULL); 2518 2519 ifp = rt->rt_ifp; 2520 2521 /* 2522 * Address check: 2523 * the source address must identify a neighbor, and 2524 * the destination address must not be a multicast address 2525 * [RFC 2461, sec 8.2] 2526 */ 2527 sip6 = mtod(m0, struct ip6_hdr *); 2528 sockaddr_in6_init(&src_sa, &sip6->ip6_src, 0, 0, 0); 2529 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0) 2530 goto fail; 2531 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst)) 2532 goto fail; /* what should we do here? */ 2533 2534 /* rate limit */ 2535 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0)) 2536 goto fail; 2537 2538 /* 2539 * Since we are going to append up to 1280 bytes (= IPV6_MMTU), 2540 * we almost always ask for an mbuf cluster for simplicity. 2541 * (MHLEN < IPV6_MMTU is almost always true) 2542 */ 2543 MGETHDR(m, M_DONTWAIT, MT_HEADER); 2544 if (m && IPV6_MMTU >= MHLEN) { 2545#if IPV6_MMTU >= MCLBYTES 2546 _MCLGET(m, mcl_cache, IPV6_MMTU, M_DONTWAIT); 2547#else 2548 MCLGET(m, M_DONTWAIT); 2549#endif 2550 } 2551 2552 if (!m) 2553 goto fail; 2554 m_reset_rcvif(m); 2555 m->m_len = 0; 2556 maxlen = M_TRAILINGSPACE(m); 2557 maxlen = min(IPV6_MMTU, maxlen); 2558 /* just for safety */ 2559 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) + 2560 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) { 2561 goto fail; 2562 } 2563 2564 { 2565 /* get ip6 linklocal address for ifp(my outgoing interface). */ 2566 struct in6_ifaddr *ia; 2567 int s = pserialize_read_enter(); 2568 if ((ia = in6ifa_ifpforlinklocal(ifp, 2569 IN6_IFF_NOTREADY| 2570 IN6_IFF_ANYCAST)) == NULL) { 2571 pserialize_read_exit(s); 2572 goto fail; 2573 } 2574 ifp_ll6 = &ia->ia_addr.sin6_addr; 2575 pserialize_read_exit(s); 2576 } 2577 2578 /* get ip6 linklocal address for the router. */ 2579 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) { 2580 struct sockaddr_in6 *sin6; 2581 sin6 = (struct sockaddr_in6 *)rt->rt_gateway; 2582 nexthop = &sin6->sin6_addr; 2583 if (!IN6_IS_ADDR_LINKLOCAL(nexthop)) 2584 nexthop = NULL; 2585 } else 2586 nexthop = NULL; 2587 2588 /* ip6 */ 2589 ip6 = mtod(m, struct ip6_hdr *); 2590 ip6->ip6_flow = 0; 2591 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2592 ip6->ip6_vfc |= IPV6_VERSION; 2593 /* ip6->ip6_plen will be set later */ 2594 ip6->ip6_nxt = IPPROTO_ICMPV6; 2595 ip6->ip6_hlim = 255; 2596 /* ip6->ip6_src must be linklocal addr for my outgoing if. */ 2597 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr)); 2598 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr)); 2599 2600 /* ND Redirect */ 2601 nd_rd = (struct nd_redirect *)(ip6 + 1); 2602 nd_rd->nd_rd_type = ND_REDIRECT; 2603 nd_rd->nd_rd_code = 0; 2604 nd_rd->nd_rd_reserved = 0; 2605 if (rt->rt_flags & RTF_GATEWAY) { 2606 /* 2607 * nd_rd->nd_rd_target must be a link-local address in 2608 * better router cases. 2609 */ 2610 if (!nexthop) 2611 goto fail; 2612 bcopy(nexthop, &nd_rd->nd_rd_target, 2613 sizeof(nd_rd->nd_rd_target)); 2614 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2615 sizeof(nd_rd->nd_rd_dst)); 2616 } else { 2617 /* make sure redtgt == reddst */ 2618 nexthop = &sip6->ip6_dst; 2619 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target, 2620 sizeof(nd_rd->nd_rd_target)); 2621 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2622 sizeof(nd_rd->nd_rd_dst)); 2623 } 2624 2625 p = (u_char *)(nd_rd + 1); 2626 2627 { 2628 /* target lladdr option */ 2629 struct llentry *ln = NULL; 2630 int len; 2631 struct nd_opt_hdr *nd_opt; 2632 char *lladdr; 2633 2634 ln = nd6_lookup(nexthop, ifp, false); 2635 if (ln == NULL) 2636 goto nolladdropt; 2637 len = sizeof(*nd_opt) + ifp->if_addrlen; 2638 len = (len + 7) & ~7; /* round by 8 */ 2639 /* safety check */ 2640 if (len + (p - (u_char *)ip6) > maxlen) { 2641 LLE_RUNLOCK(ln); 2642 goto nolladdropt; 2643 } 2644 if (ln->la_flags & LLE_VALID) { 2645 nd_opt = (struct nd_opt_hdr *)p; 2646 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 2647 nd_opt->nd_opt_len = len >> 3; 2648 lladdr = (char *)(nd_opt + 1); 2649 memcpy(lladdr, &ln->ll_addr, ifp->if_addrlen); 2650 p += len; 2651 } 2652 LLE_RUNLOCK(ln); 2653 } 2654 nolladdropt:; 2655 2656 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2657 2658 /* just to be safe */ 2659 if (m0->m_flags & M_DECRYPTED) 2660 goto noredhdropt; 2661 if (p - (u_char *)ip6 > maxlen) 2662 goto noredhdropt; 2663 2664 { 2665 /* redirected header option */ 2666 int len; 2667 struct nd_opt_rd_hdr *nd_opt_rh; 2668 2669 /* 2670 * compute the maximum size for icmp6 redirect header option. 2671 * XXX room for auth header? 2672 */ 2673 len = maxlen - (p - (u_char *)ip6); 2674 len &= ~7; 2675 2676 /* 2677 * Redirected header option spec (RFC2461 4.6.3) talks nothing 2678 * about padding/truncate rule for the original IP packet. 2679 * From the discussion on IPv6imp in Feb 1999, 2680 * the consensus was: 2681 * - "attach as much as possible" is the goal 2682 * - pad if not aligned (original size can be guessed by 2683 * original ip6 header) 2684 * Following code adds the padding if it is simple enough, 2685 * and truncates if not. 2686 */ 2687 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) { 2688 /* not enough room, truncate */ 2689 m_adj(m0, (len - sizeof(*nd_opt_rh)) - 2690 m0->m_pkthdr.len); 2691 } else { 2692 /* 2693 * enough room, truncate if not aligned. 2694 * we don't pad here for simplicity. 2695 */ 2696 size_t extra; 2697 2698 extra = m0->m_pkthdr.len % 8; 2699 if (extra) { 2700 /* truncate */ 2701 m_adj(m0, -extra); 2702 } 2703 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh); 2704 } 2705 2706 nd_opt_rh = (struct nd_opt_rd_hdr *)p; 2707 memset(nd_opt_rh, 0, sizeof(*nd_opt_rh)); 2708 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER; 2709 nd_opt_rh->nd_opt_rh_len = len >> 3; 2710 p += sizeof(*nd_opt_rh); 2711 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2712 2713 /* connect m0 to m */ 2714 m->m_pkthdr.len += m0->m_pkthdr.len; 2715 m_cat(m, m0); 2716 m0 = NULL; 2717 } 2718noredhdropt: 2719 if (m0) { 2720 m_freem(m0); 2721 m0 = NULL; 2722 } 2723 2724 /* XXX: clear embedded link IDs in the inner header */ 2725 in6_clearscope(&sip6->ip6_src); 2726 in6_clearscope(&sip6->ip6_dst); 2727 in6_clearscope(&nd_rd->nd_rd_target); 2728 in6_clearscope(&nd_rd->nd_rd_dst); 2729 2730 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 2731 2732 nd_rd->nd_rd_cksum = 0; 2733 nd_rd->nd_rd_cksum 2734 = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen)); 2735 2736 /* send the packet to outside... */ 2737 if (ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL) != 0) 2738 icmp6_ifstat_inc(ifp, ifs6_out_error); 2739 2740 icmp6_ifstat_inc(ifp, ifs6_out_msg); 2741 icmp6_ifstat_inc(ifp, ifs6_out_redirect); 2742 ICMP6_STATINC(ICMP6_STAT_OUTHIST + ND_REDIRECT); 2743 2744 return; 2745 2746fail: 2747 if (m) 2748 m_freem(m); 2749 if (m0) 2750 m_freem(m0); 2751} 2752 2753/* 2754 * ICMPv6 socket option processing. 2755 */ 2756int 2757icmp6_ctloutput(int op, struct socket *so, struct sockopt *sopt) 2758{ 2759 int error = 0; 2760 struct in6pcb *in6p = sotoin6pcb(so); 2761 2762 if (sopt->sopt_level != IPPROTO_ICMPV6) 2763 return rip6_ctloutput(op, so, sopt); 2764 2765 switch (op) { 2766 case PRCO_SETOPT: 2767 switch (sopt->sopt_name) { 2768 case ICMP6_FILTER: 2769 { 2770 struct icmp6_filter fil; 2771 2772 error = sockopt_get(sopt, &fil, sizeof(fil)); 2773 if (error) 2774 break; 2775 memcpy(in6p->in6p_icmp6filt, &fil, 2776 sizeof(struct icmp6_filter)); 2777 error = 0; 2778 break; 2779 } 2780 2781 default: 2782 error = ENOPROTOOPT; 2783 break; 2784 } 2785 break; 2786 2787 case PRCO_GETOPT: 2788 switch (sopt->sopt_name) { 2789 case ICMP6_FILTER: 2790 { 2791 if (in6p->in6p_icmp6filt == NULL) { 2792 error = EINVAL; 2793 break; 2794 } 2795 error = sockopt_set(sopt, in6p->in6p_icmp6filt, 2796 sizeof(struct icmp6_filter)); 2797 break; 2798 } 2799 2800 default: 2801 error = ENOPROTOOPT; 2802 break; 2803 } 2804 break; 2805 } 2806 2807 return (error); 2808} 2809 2810/* 2811 * Perform rate limit check. 2812 * Returns 0 if it is okay to send the icmp6 packet. 2813 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate 2814 * limitation. 2815 * 2816 * XXX per-destination/type check necessary? 2817 */ 2818static int 2819icmp6_ratelimit( 2820 const struct in6_addr *dst, /* not used at this moment */ 2821 const int type, /* not used at this moment */ 2822 const int code) /* not used at this moment */ 2823{ 2824 int ret; 2825 2826 ret = 0; /* okay to send */ 2827 2828 /* PPS limit */ 2829 if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count, 2830 icmp6errppslim)) { 2831 /* The packet is subject to rate limit */ 2832 ret++; 2833 } 2834 2835 return ret; 2836} 2837 2838static struct rtentry * 2839icmp6_mtudisc_clone(struct sockaddr *dst) 2840{ 2841 struct rtentry *rt; 2842 int error; 2843 2844 rt = rtalloc1(dst, 1); 2845 if (rt == 0) 2846 return NULL; 2847 2848 /* If we didn't get a host route, allocate one */ 2849 if ((rt->rt_flags & RTF_HOST) == 0) { 2850 struct rtentry *nrt; 2851 2852 error = rtrequest(RTM_ADD, dst, rt->rt_gateway, NULL, 2853 RTF_GATEWAY | RTF_HOST | RTF_DYNAMIC, &nrt); 2854 if (error) { 2855 rt_unref(rt); 2856 return NULL; 2857 } 2858 nrt->rt_rmx = rt->rt_rmx; 2859 rt_unref(rt); 2860 rt = nrt; 2861 } 2862 2863 mutex_enter(&icmp6_mtx); 2864 error = rt_timer_add(rt, icmp6_mtudisc_timeout, 2865 icmp6_mtudisc_timeout_q); 2866 mutex_exit(&icmp6_mtx); 2867 2868 if (error) { 2869 rt_unref(rt); 2870 return NULL; 2871 } 2872 2873 return rt; /* caller need to call rtfree() */ 2874} 2875 2876static void 2877icmp6_mtudisc_timeout(struct rtentry *rt, struct rttimer *r) 2878{ 2879 2880 KASSERT(rt != NULL); 2881 rt_assert_referenced(rt); 2882 2883 if ((rt->rt_flags & (RTF_DYNAMIC | RTF_HOST)) == 2884 (RTF_DYNAMIC | RTF_HOST)) { 2885 rtrequest(RTM_DELETE, rt_getkey(rt), 2886 rt->rt_gateway, rt_mask(rt), rt->rt_flags, NULL); 2887 } else { 2888 if (!(rt->rt_rmx.rmx_locks & RTV_MTU)) 2889 rt->rt_rmx.rmx_mtu = 0; 2890 } 2891} 2892 2893static void 2894icmp6_redirect_timeout(struct rtentry *rt, struct rttimer *r) 2895{ 2896 2897 KASSERT(rt != NULL); 2898 rt_assert_referenced(rt); 2899 2900 if ((rt->rt_flags & (RTF_GATEWAY | RTF_DYNAMIC | RTF_HOST)) == 2901 (RTF_GATEWAY | RTF_DYNAMIC | RTF_HOST)) { 2902 rtrequest(RTM_DELETE, rt_getkey(rt), 2903 rt->rt_gateway, rt_mask(rt), rt->rt_flags, NULL); 2904 } 2905} 2906 2907/* 2908 * sysctl helper routine for the net.inet6.icmp6.nd6 nodes. silly? 2909 */ 2910static int 2911sysctl_net_inet6_icmp6_nd6(SYSCTLFN_ARGS) 2912{ 2913 (void)&name; 2914 (void)&l; 2915 (void)&oname; 2916 2917 if (namelen != 0) 2918 return (EINVAL); 2919 2920 return (nd6_sysctl(rnode->sysctl_num, oldp, oldlenp, 2921 /*XXXUNCONST*/ 2922 __UNCONST(newp), newlen)); 2923} 2924 2925static int 2926sysctl_net_inet6_icmp6_stats(SYSCTLFN_ARGS) 2927{ 2928 2929 return (NETSTAT_SYSCTL(icmp6stat_percpu, ICMP6_NSTATS)); 2930} 2931 2932static int 2933sysctl_net_inet6_icmp6_redirtimeout(SYSCTLFN_ARGS) 2934{ 2935 int error, tmp; 2936 struct sysctlnode node; 2937 2938 mutex_enter(&icmp6_mtx); 2939 2940 node = *rnode; 2941 node.sysctl_data = &tmp; 2942 tmp = icmp6_redirtimeout; 2943 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 2944 if (error || newp == NULL) 2945 goto out; 2946 if (tmp < 0) { 2947 error = EINVAL; 2948 goto out; 2949 } 2950 icmp6_redirtimeout = tmp; 2951 2952 if (icmp6_redirect_timeout_q != NULL) { 2953 if (icmp6_redirtimeout == 0) { 2954 rt_timer_queue_destroy(icmp6_redirect_timeout_q); 2955 } else { 2956 rt_timer_queue_change(icmp6_redirect_timeout_q, 2957 icmp6_redirtimeout); 2958 } 2959 } else if (icmp6_redirtimeout > 0) { 2960 icmp6_redirect_timeout_q = 2961 rt_timer_queue_create(icmp6_redirtimeout); 2962 } 2963 error = 0; 2964out: 2965 mutex_exit(&icmp6_mtx); 2966 return error; 2967} 2968 2969static void 2970sysctl_net_inet6_icmp6_setup(struct sysctllog **clog) 2971{ 2972 extern int nd6_maxqueuelen; /* defined in nd6.c */ 2973 2974 sysctl_createv(clog, 0, NULL, NULL, 2975 CTLFLAG_PERMANENT, 2976 CTLTYPE_NODE, "inet6", NULL, 2977 NULL, 0, NULL, 0, 2978 CTL_NET, PF_INET6, CTL_EOL); 2979 sysctl_createv(clog, 0, NULL, NULL, 2980 CTLFLAG_PERMANENT, 2981 CTLTYPE_NODE, "icmp6", 2982 SYSCTL_DESCR("ICMPv6 related settings"), 2983 NULL, 0, NULL, 0, 2984 CTL_NET, PF_INET6, IPPROTO_ICMPV6, CTL_EOL); 2985 2986 sysctl_createv(clog, 0, NULL, NULL, 2987 CTLFLAG_PERMANENT, 2988 CTLTYPE_STRUCT, "stats", 2989 SYSCTL_DESCR("ICMPv6 transmission statistics"), 2990 sysctl_net_inet6_icmp6_stats, 0, NULL, 0, 2991 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2992 ICMPV6CTL_STATS, CTL_EOL); 2993 sysctl_createv(clog, 0, NULL, NULL, 2994 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2995 CTLTYPE_INT, "rediraccept", 2996 SYSCTL_DESCR("Accept and process redirect messages"), 2997 NULL, 0, &icmp6_rediraccept, 0, 2998 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2999 ICMPV6CTL_REDIRACCEPT, CTL_EOL); 3000 sysctl_createv(clog, 0, NULL, NULL, 3001 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3002 CTLTYPE_INT, "redirtimeout", 3003 SYSCTL_DESCR("Redirect generated route lifetime"), 3004 sysctl_net_inet6_icmp6_redirtimeout, 0, 3005 &icmp6_redirtimeout, 0, 3006 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3007 ICMPV6CTL_REDIRTIMEOUT, CTL_EOL); 3008#if 0 /* obsoleted */ 3009 sysctl_createv(clog, 0, NULL, NULL, 3010 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3011 CTLTYPE_INT, "errratelimit", NULL, 3012 NULL, 0, &icmp6_errratelimit, 0, 3013 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3014 ICMPV6CTL_ERRRATELIMIT, CTL_EOL); 3015#endif 3016 sysctl_createv(clog, 0, NULL, NULL, 3017 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3018 CTLTYPE_INT, "nd6_prune", 3019 SYSCTL_DESCR("Neighbor discovery prune interval"), 3020 NULL, 0, &nd6_prune, 0, 3021 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3022 ICMPV6CTL_ND6_PRUNE, CTL_EOL); 3023 sysctl_createv(clog, 0, NULL, NULL, 3024 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3025 CTLTYPE_INT, "nd6_delay", 3026 SYSCTL_DESCR("First probe delay time"), 3027 NULL, 0, &nd6_delay, 0, 3028 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3029 ICMPV6CTL_ND6_DELAY, CTL_EOL); 3030 sysctl_createv(clog, 0, NULL, NULL, 3031 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3032 CTLTYPE_INT, "nd6_umaxtries", 3033 SYSCTL_DESCR("Number of unicast discovery attempts"), 3034 NULL, 0, &nd6_umaxtries, 0, 3035 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3036 ICMPV6CTL_ND6_UMAXTRIES, CTL_EOL); 3037 sysctl_createv(clog, 0, NULL, NULL, 3038 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3039 CTLTYPE_INT, "nd6_mmaxtries", 3040 SYSCTL_DESCR("Number of multicast discovery attempts"), 3041 NULL, 0, &nd6_mmaxtries, 0, 3042 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3043 ICMPV6CTL_ND6_MMAXTRIES, CTL_EOL); 3044 sysctl_createv(clog, 0, NULL, NULL, 3045 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3046 CTLTYPE_INT, "nd6_useloopback", 3047 SYSCTL_DESCR("Use loopback interface for local traffic"), 3048 NULL, 0, &nd6_useloopback, 0, 3049 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3050 ICMPV6CTL_ND6_USELOOPBACK, CTL_EOL); 3051#if 0 /* obsoleted */ 3052 sysctl_createv(clog, 0, NULL, NULL, 3053 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3054 CTLTYPE_INT, "nd6_proxyall", NULL, 3055 NULL, 0, &nd6_proxyall, 0, 3056 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3057 ICMPV6CTL_ND6_PROXYALL, CTL_EOL); 3058#endif 3059 sysctl_createv(clog, 0, NULL, NULL, 3060 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3061 CTLTYPE_INT, "nodeinfo", 3062 SYSCTL_DESCR("Respond to node information requests"), 3063 NULL, 0, &icmp6_nodeinfo, 0, 3064 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3065 ICMPV6CTL_NODEINFO, CTL_EOL); 3066 sysctl_createv(clog, 0, NULL, NULL, 3067 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3068 CTLTYPE_INT, "errppslimit", 3069 SYSCTL_DESCR("Maximum ICMP errors sent per second"), 3070 NULL, 0, &icmp6errppslim, 0, 3071 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3072 ICMPV6CTL_ERRPPSLIMIT, CTL_EOL); 3073 sysctl_createv(clog, 0, NULL, NULL, 3074 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3075 CTLTYPE_INT, "nd6_maxnudhint", 3076 SYSCTL_DESCR("Maximum neighbor unreachable hint count"), 3077 NULL, 0, &nd6_maxnudhint, 0, 3078 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3079 ICMPV6CTL_ND6_MAXNUDHINT, CTL_EOL); 3080 sysctl_createv(clog, 0, NULL, NULL, 3081 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3082 CTLTYPE_INT, "mtudisc_hiwat", 3083 SYSCTL_DESCR("Low mark on MTU Discovery route timers"), 3084 NULL, 0, &icmp6_mtudisc_hiwat, 0, 3085 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3086 ICMPV6CTL_MTUDISC_HIWAT, CTL_EOL); 3087 sysctl_createv(clog, 0, NULL, NULL, 3088 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3089 CTLTYPE_INT, "mtudisc_lowat", 3090 SYSCTL_DESCR("Low mark on MTU Discovery route timers"), 3091 NULL, 0, &icmp6_mtudisc_lowat, 0, 3092 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3093 ICMPV6CTL_MTUDISC_LOWAT, CTL_EOL); 3094 sysctl_createv(clog, 0, NULL, NULL, 3095 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3096 CTLTYPE_INT, "nd6_debug", 3097 SYSCTL_DESCR("Enable neighbor discovery debug output"), 3098 NULL, 0, &nd6_debug, 0, 3099 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3100 ICMPV6CTL_ND6_DEBUG, CTL_EOL); 3101 sysctl_createv(clog, 0, NULL, NULL, 3102 CTLFLAG_PERMANENT, 3103 CTLTYPE_STRUCT, "nd6_drlist", 3104 SYSCTL_DESCR("Default router list"), 3105 sysctl_net_inet6_icmp6_nd6, 0, NULL, 0, 3106 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3107 ICMPV6CTL_ND6_DRLIST, CTL_EOL); 3108 sysctl_createv(clog, 0, NULL, NULL, 3109 CTLFLAG_PERMANENT, 3110 CTLTYPE_STRUCT, "nd6_prlist", 3111 SYSCTL_DESCR("Prefix list"), 3112 sysctl_net_inet6_icmp6_nd6, 0, NULL, 0, 3113 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3114 ICMPV6CTL_ND6_PRLIST, CTL_EOL); 3115 sysctl_createv(clog, 0, NULL, NULL, 3116 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3117 CTLTYPE_INT, "maxqueuelen", 3118 SYSCTL_DESCR("max packet queue len for a unresolved ND"), 3119 NULL, 1, &nd6_maxqueuelen, 0, 3120 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 3121 ICMPV6CTL_ND6_MAXQLEN, CTL_EOL); 3122} 3123 3124void 3125icmp6_statinc(u_int stat) 3126{ 3127 3128 KASSERT(stat < ICMP6_NSTATS); 3129 ICMP6_STATINC(stat); 3130} 3131