1/* 2 * Copyright (c) 2000-2012 Apple Inc. All rights reserved. 3 * 4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5 * 6 * This file contains Original Code and/or Modifications of Original Code 7 * as defined in and that are subject to the Apple Public Source License 8 * Version 2.0 (the 'License'). You may not use this file except in 9 * compliance with the License. The rights granted to you under the License 10 * may not be used to create, or enable the creation or redistribution of, 11 * unlawful or unlicensed copies of an Apple operating system, or to 12 * circumvent, violate, or enable the circumvention or violation of, any 13 * terms of an Apple operating system software license agreement. 14 * 15 * Please obtain a copy of the License at 16 * http://www.opensource.apple.com/apsl/ and read it before using this file. 17 * 18 * The Original Code and all software distributed under the License are 19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23 * Please see the License for the specific language governing rights and 24 * limitations under the License. 25 * 26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27 */ 28 29/* $FreeBSD: src/sys/netinet6/icmp6.c,v 1.6.2.6 2001/07/10 09:44:16 ume Exp $ */ 30/* $KAME: icmp6.c,v 1.211 2001/04/04 05:56:20 itojun Exp $ */ 31 32/* 33 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 34 * All rights reserved. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 2. Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in the 43 * documentation and/or other materials provided with the distribution. 44 * 3. Neither the name of the project nor the names of its contributors 45 * may be used to endorse or promote products derived from this software 46 * without specific prior written permission. 47 * 48 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 51 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 58 * SUCH DAMAGE. 59 */ 60 61/* 62 * Copyright (c) 1982, 1986, 1988, 1993 63 * The Regents of the University of California. All rights reserved. 64 * 65 * Redistribution and use in source and binary forms, with or without 66 * modification, are permitted provided that the following conditions 67 * are met: 68 * 1. Redistributions of source code must retain the above copyright 69 * notice, this list of conditions and the following disclaimer. 70 * 2. Redistributions in binary form must reproduce the above copyright 71 * notice, this list of conditions and the following disclaimer in the 72 * documentation and/or other materials provided with the distribution. 73 * 3. All advertising materials mentioning features or use of this software 74 * must display the following acknowledgement: 75 * This product includes software developed by the University of 76 * California, Berkeley and its contributors. 77 * 4. Neither the name of the University nor the names of its contributors 78 * may be used to endorse or promote products derived from this software 79 * without specific prior written permission. 80 * 81 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 82 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 83 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 84 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 85 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 86 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 87 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 88 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 89 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 90 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 91 * SUCH DAMAGE. 92 * 93 * @(#)ip_icmp.c 8.2 (Berkeley) 1/4/94 94 */ 95 96 97#include <sys/param.h> 98#include <sys/systm.h> 99#include <sys/lock.h> 100#include <sys/malloc.h> 101#include <sys/mcache.h> 102#include <sys/mbuf.h> 103#include <sys/protosw.h> 104#include <sys/socket.h> 105#include <sys/socketvar.h> 106#include <sys/time.h> 107#include <sys/kernel.h> 108#include <sys/syslog.h> 109#include <sys/domain.h> 110#include <sys/kauth.h> 111 112#include <net/if.h> 113#include <net/route.h> 114#include <net/if_dl.h> 115#include <net/if_types.h> 116 117#include <netinet/in.h> 118#include <netinet/in_var.h> 119#include <netinet/ip6.h> 120#include <netinet6/ip6_var.h> 121#include <netinet/icmp6.h> 122#include <netinet6/mld6_var.h> 123#include <netinet/in_pcb.h> 124#include <netinet6/in6_pcb.h> 125#include <netinet6/nd6.h> 126#include <netinet6/in6_ifattach.h> 127#include <netinet6/ip6protosw.h> 128#include <netinet6/scope6_var.h> 129 130#if IPSEC 131#include <netinet6/ipsec.h> 132#include <netkey/key.h> 133 134extern int ipsec_bypass; 135#endif 136 137#include <net/net_osdep.h> 138 139extern struct domain inet6domain; 140extern struct ip6protosw inet6sw[]; 141extern struct ip6protosw *ip6_protox[]; 142 143extern uint32_t rip_sendspace; 144extern uint32_t rip_recvspace; 145 146struct icmp6stat icmp6stat; 147 148extern struct inpcbhead ripcb; 149extern int icmp6errppslim; 150static int icmp6errpps_count = 0; 151static struct timeval icmp6errppslim_last; 152extern int icmp6_nodeinfo; 153extern struct inpcbinfo ripcbinfo; 154extern lck_mtx_t *inet6_domain_mutex; 155 156static void icmp6_errcount(struct icmp6errstat *, int, int); 157static int icmp6_rip6_input(struct mbuf **, int); 158static int icmp6_ratelimit(const struct in6_addr *, const int, const int); 159static const char *icmp6_redirect_diag(struct in6_addr *, 160 struct in6_addr *, struct in6_addr *); 161#ifndef HAVE_PPSRATECHECK 162static int ppsratecheck(struct timeval *, int *, int); 163#endif 164static struct mbuf *ni6_input(struct mbuf *, int); 165static struct mbuf *ni6_nametodns(const char *, int, int); 166static int ni6_dnsmatch(const char *, int, const char *, int); 167static int ni6_addrs(struct icmp6_nodeinfo *, 168 struct ifnet **, char *); 169static int ni6_store_addrs(struct icmp6_nodeinfo *, struct icmp6_nodeinfo *, 170 struct ifnet *, int); 171static int icmp6_notify_error(struct mbuf *, int, int, int); 172 173 174 175void 176icmp6_init() 177{ 178 mld_init(); 179} 180 181static void 182icmp6_errcount(stat, type, code) 183 struct icmp6errstat *stat; 184 int type, code; 185{ 186 switch (type) { 187 case ICMP6_DST_UNREACH: 188 switch (code) { 189 case ICMP6_DST_UNREACH_NOROUTE: 190 stat->icp6errs_dst_unreach_noroute++; 191 return; 192 case ICMP6_DST_UNREACH_ADMIN: 193 stat->icp6errs_dst_unreach_admin++; 194 return; 195 case ICMP6_DST_UNREACH_BEYONDSCOPE: 196 stat->icp6errs_dst_unreach_beyondscope++; 197 return; 198 case ICMP6_DST_UNREACH_ADDR: 199 stat->icp6errs_dst_unreach_addr++; 200 return; 201 case ICMP6_DST_UNREACH_NOPORT: 202 stat->icp6errs_dst_unreach_noport++; 203 return; 204 } 205 break; 206 case ICMP6_PACKET_TOO_BIG: 207 stat->icp6errs_packet_too_big++; 208 return; 209 case ICMP6_TIME_EXCEEDED: 210 switch (code) { 211 case ICMP6_TIME_EXCEED_TRANSIT: 212 stat->icp6errs_time_exceed_transit++; 213 return; 214 case ICMP6_TIME_EXCEED_REASSEMBLY: 215 stat->icp6errs_time_exceed_reassembly++; 216 return; 217 } 218 break; 219 case ICMP6_PARAM_PROB: 220 switch (code) { 221 case ICMP6_PARAMPROB_HEADER: 222 stat->icp6errs_paramprob_header++; 223 return; 224 case ICMP6_PARAMPROB_NEXTHEADER: 225 stat->icp6errs_paramprob_nextheader++; 226 return; 227 case ICMP6_PARAMPROB_OPTION: 228 stat->icp6errs_paramprob_option++; 229 return; 230 } 231 break; 232 case ND_REDIRECT: 233 stat->icp6errs_redirect++; 234 return; 235 } 236 stat->icp6errs_unknown++; 237} 238 239/* 240 * A wrapper function for icmp6_error() necessary when the erroneous packet 241 * may not contain enough scope zone information. 242 */ 243void 244icmp6_error2(struct mbuf *m, int type, int code, int param, 245 struct ifnet *ifp) 246{ 247 struct ip6_hdr *ip6; 248 249 if (ifp == NULL) 250 return; 251 252#ifndef PULLDOWN_TEST 253 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr),return ); 254#else 255 if (m->m_len < sizeof(struct ip6_hdr)) { 256 m = m_pullup(m, sizeof(struct ip6_hdr)); 257 if (m == NULL) 258 return; 259 } 260#endif 261 262 ip6 = mtod(m, struct ip6_hdr *); 263 264 if (in6_setscope(&ip6->ip6_src, ifp, NULL) != 0) 265 return; 266 if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0) 267 return; 268 269 icmp6_error(m, type, code, param); 270} 271 272/* 273 * Generate an error packet of type error in response to bad IP6 packet. 274 */ 275void 276icmp6_error(struct mbuf *m, int type, int code, int param) 277{ 278 struct ip6_hdr *oip6, *nip6; 279 struct icmp6_hdr *icmp6; 280 u_int preplen; 281 int off; 282 int nxt; 283 284 icmp6stat.icp6s_error++; 285 286 /* count per-type-code statistics */ 287 icmp6_errcount(&icmp6stat.icp6s_outerrhist, type, code); 288 289#ifdef M_DECRYPTED /*not openbsd*/ 290 if (m->m_flags & M_DECRYPTED) { 291 icmp6stat.icp6s_canterror++; 292 goto freeit; 293 } 294#endif 295 296#ifndef PULLDOWN_TEST 297 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), return); 298#else 299 if (m->m_len < sizeof(struct ip6_hdr)) { 300 m = m_pullup(m, sizeof(struct ip6_hdr)); 301 if (m == NULL) 302 return; 303 } 304#endif 305 oip6 = mtod(m, struct ip6_hdr *); 306 307 /* 308 * If the destination address of the erroneous packet is a multicast 309 * address, or the packet was sent using link-layer multicast, 310 * we should basically suppress sending an error (RFC 2463, Section 311 * 2.4). 312 * We have two exceptions (the item e.2 in that section): 313 * - the Pakcet Too Big message can be sent for path MTU discovery. 314 * - the Parameter Problem Message that can be allowed an icmp6 error 315 * in the option type field. This check has been done in 316 * ip6_unknown_opt(), so we can just check the type and code. 317 */ 318 if ((m->m_flags & (M_BCAST|M_MCAST) || 319 IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) && 320 (type != ICMP6_PACKET_TOO_BIG && 321 (type != ICMP6_PARAM_PROB || 322 code != ICMP6_PARAMPROB_OPTION))) 323 goto freeit; 324 325 /* 326 * RFC 2463, 2.4 (e.5): source address check. 327 * XXX: the case of anycast source? 328 */ 329 if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) || 330 IN6_IS_ADDR_MULTICAST(&oip6->ip6_src)) 331 goto freeit; 332 333 /* 334 * If we are about to send ICMPv6 against ICMPv6 error/redirect, 335 * don't do it. 336 */ 337 nxt = -1; 338 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 339 if (off >= 0 && nxt == IPPROTO_ICMPV6) { 340 struct icmp6_hdr *icp; 341 342#ifndef PULLDOWN_TEST 343 IP6_EXTHDR_CHECK(m, 0, off + sizeof(struct icmp6_hdr), return); 344 icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 345#else 346 IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off, 347 sizeof(*icp)); 348 if (icp == NULL) { 349 icmp6stat.icp6s_tooshort++; 350 return; 351 } 352#endif 353 if (icp->icmp6_type < ICMP6_ECHO_REQUEST || 354 icp->icmp6_type == ND_REDIRECT) { 355 /* 356 * ICMPv6 error 357 * Special case: for redirect (which is 358 * informational) we must not send icmp6 error. 359 */ 360 icmp6stat.icp6s_canterror++; 361 goto freeit; 362 } else { 363 /* ICMPv6 informational - send the error */ 364 } 365 } else { 366 /* non-ICMPv6 - send the error */ 367 } 368 369 oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */ 370 371 /* Finally, do rate limitation check. */ 372 if (icmp6_ratelimit(&oip6->ip6_src, type, code)) { 373 icmp6stat.icp6s_toofreq++; 374 goto freeit; 375 } 376 377 /* 378 * OK, ICMP6 can be generated. 379 */ 380 381 if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN) 382 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len); 383 384 preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 385 M_PREPEND(m, preplen, M_DONTWAIT); 386 if (m && m->m_len < preplen) 387 m = m_pullup(m, preplen); 388 if (m == NULL) { 389 nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__)); 390 return; 391 } 392 393 nip6 = mtod(m, struct ip6_hdr *); 394 nip6->ip6_src = oip6->ip6_src; 395 nip6->ip6_dst = oip6->ip6_dst; 396 397 in6_clearscope(&oip6->ip6_src); 398 in6_clearscope(&oip6->ip6_dst); 399 400 icmp6 = (struct icmp6_hdr *)(nip6 + 1); 401 icmp6->icmp6_type = type; 402 icmp6->icmp6_code = code; 403 icmp6->icmp6_pptr = htonl((u_int32_t)param); 404 405 /* 406 * icmp6_reflect() is designed to be in the input path. 407 * icmp6_error() can be called from both input and output path, 408 * and if we are in output path rcvif could contain bogus value. 409 * clear m->m_pkthdr.rcvif for safety, we should have enough scope 410 * information in ip header (nip6). 411 */ 412 m->m_pkthdr.rcvif = NULL; 413 414 icmp6stat.icp6s_outhist[type]++; 415 icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */ 416 417 return; 418 419 freeit: 420 /* 421 * If we can't tell whether or not we can generate ICMP6, free it. 422 */ 423 m_freem(m); 424} 425 426/* 427 * Process a received ICMP6 message. 428 */ 429int 430icmp6_input(struct mbuf **mp, int *offp, int proto) 431{ 432#pragma unused(proto) 433 struct mbuf *m = *mp, *n; 434 struct ifnet *ifp; 435 struct ip6_hdr *ip6, *nip6; 436 struct icmp6_hdr *icmp6, *nicmp6; 437 int off = *offp; 438 int icmp6len = m->m_pkthdr.len - *offp; 439 int code, sum, noff, proxy = 0; 440 441 ifp = m->m_pkthdr.rcvif; 442 443#ifndef PULLDOWN_TEST 444 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr), return IPPROTO_DONE); 445 /* m might change if M_LOOP. So, call mtod after this */ 446#endif 447 448 /* Expect 32-bit aligned data pointer on strict-align platforms */ 449 MBUF_STRICT_DATA_ALIGNMENT_CHECK_32(m); 450 451 /* 452 * Locate icmp6 structure in mbuf, and check 453 * that not corrupted and of at least minimum length 454 */ 455 ip6 = mtod(m, struct ip6_hdr *); 456 if (icmp6len < sizeof(struct icmp6_hdr)) { 457 icmp6stat.icp6s_tooshort++; 458 goto freeit; 459 } 460 461 /* 462 * Check multicast group membership. 463 * Note: SSM filters are not applied for ICMPv6 traffic. 464 */ 465 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 466 struct in6_multi *inm; 467 468 in6_multihead_lock_shared(); 469 IN6_LOOKUP_MULTI(&ip6->ip6_dst, ifp, inm); 470 in6_multihead_lock_done(); 471 472 if (inm == NULL) { 473 /* 474 * Don't discard if this is a Neighbor Solicitation 475 * that needs to be proxied (see check down below.) 476 */ 477 if (!(m->m_pkthdr.aux_flags & MAUXF_PROXY_DST)) { 478 ip6stat.ip6s_notmember++; 479 in6_ifstat_inc(m->m_pkthdr.rcvif, 480 ifs6_in_discard); 481 goto freeit; 482 } 483 } else { 484 IN6M_REMREF(inm); 485 } 486 } 487 488 /* 489 * calculate the checksum 490 */ 491#ifndef PULLDOWN_TEST 492 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off); 493#else 494 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 495 if (icmp6 == NULL) { 496 icmp6stat.icp6s_tooshort++; 497 return IPPROTO_DONE; 498 } 499#endif 500 code = icmp6->icmp6_code; 501 502 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) { 503 nd6log((LOG_ERR, 504 "ICMP6 checksum error(%d|%x) %s\n", 505 icmp6->icmp6_type, sum, ip6_sprintf(&ip6->ip6_src))); 506 icmp6stat.icp6s_checksum++; 507 goto freeit; 508 } 509 510 if (m->m_pkthdr.aux_flags & MAUXF_PROXY_DST) { 511 /* 512 * This is the special case of proxying NS (dst is either 513 * solicited-node multicast or unicast); process it locally 514 * but don't deliver it to sockets. It practically lets us 515 * steer the packet to nd6_prproxy_ns_input, where more 516 * specific tests and actions will be taken. 517 */ 518 switch (icmp6->icmp6_type) { 519 case ND_NEIGHBOR_SOLICIT: 520 proxy = 1; 521 break; 522 default: 523 goto freeit; 524 } 525 } 526 527 icmp6stat.icp6s_inhist[icmp6->icmp6_type]++; 528 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_msg); 529 if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK) 530 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error); 531 532 switch (icmp6->icmp6_type) { 533 case ICMP6_DST_UNREACH: 534 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_dstunreach); 535 switch (code) { 536 case ICMP6_DST_UNREACH_NOROUTE: 537 code = PRC_UNREACH_NET; 538 break; 539 case ICMP6_DST_UNREACH_ADMIN: 540 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_adminprohib); 541 code = PRC_UNREACH_PROTOCOL; /* is this a good code? */ 542 break; 543 case ICMP6_DST_UNREACH_ADDR: 544 code = PRC_HOSTDEAD; 545 break; 546 case ICMP6_DST_UNREACH_BEYONDSCOPE: 547 /* I mean "source address was incorrect." */ 548 code = PRC_PARAMPROB; 549 break; 550 case ICMP6_DST_UNREACH_NOPORT: 551 code = PRC_UNREACH_PORT; 552 break; 553 default: 554 goto badcode; 555 } 556 goto deliver; 557 break; 558 559 case ICMP6_PACKET_TOO_BIG: 560 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_pkttoobig); 561 562 code = PRC_MSGSIZE; 563 564 /* 565 * Updating the path MTU will be done after examining 566 * intermediate extension headers. 567 */ 568 goto deliver; 569 break; 570 571 case ICMP6_TIME_EXCEEDED: 572 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_timeexceed); 573 switch (code) { 574 case ICMP6_TIME_EXCEED_TRANSIT: 575 code = PRC_TIMXCEED_INTRANS; 576 break; 577 case ICMP6_TIME_EXCEED_REASSEMBLY: 578 code = PRC_TIMXCEED_REASS; 579 break; 580 default: 581 goto badcode; 582 } 583 goto deliver; 584 break; 585 586 case ICMP6_PARAM_PROB: 587 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_paramprob); 588 switch (code) { 589 case ICMP6_PARAMPROB_NEXTHEADER: 590 code = PRC_UNREACH_PROTOCOL; 591 break; 592 case ICMP6_PARAMPROB_HEADER: 593 case ICMP6_PARAMPROB_OPTION: 594 code = PRC_PARAMPROB; 595 break; 596 default: 597 goto badcode; 598 } 599 goto deliver; 600 break; 601 602 case ICMP6_ECHO_REQUEST: 603 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echo); 604 if (code != 0) 605 goto badcode; 606 607 if (icmp6_ratelimit(&ip6->ip6_dst, icmp6->icmp6_type, code)) { 608 icmp6stat.icp6s_toofreq++; 609 goto freeit; 610 } 611 612 if ((n = m_copy(m, 0, M_COPYALL)) == NULL) { 613 /* Give up remote */ 614 goto rate_limit_checked; 615 break; 616 } 617 if ((n->m_flags & M_EXT) != 0 618 || n->m_len < off + sizeof(struct icmp6_hdr)) { 619 struct mbuf *n0 = n; 620 const int maxlen = sizeof(*nip6) + sizeof(*nicmp6); 621 622 /* 623 * Prepare an internal mbuf. m_pullup() doesn't 624 * always copy the length we specified. 625 */ 626 if (maxlen >= MCLBYTES) { 627 /* Give up remote */ 628 m_freem(n0); 629 goto rate_limit_checked; 630 break; 631 } 632 MGETHDR(n, M_DONTWAIT, n0->m_type); /* MAC-OK */ 633 if (n && maxlen >= MHLEN) { 634 MCLGET(n, M_DONTWAIT); 635 if ((n->m_flags & M_EXT) == 0) { 636 m_free(n); 637 n = NULL; 638 } 639 } 640 if (n == NULL) { 641 /* Give up remote */ 642 m_freem(n0); 643 goto rate_limit_checked; 644 break; 645 } 646 M_COPY_PKTHDR(n, n0); 647 /* 648 * Copy IPv6 and ICMPv6 only. 649 */ 650 nip6 = mtod(n, struct ip6_hdr *); 651 bcopy(ip6, nip6, sizeof(struct ip6_hdr)); 652 nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 653 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); 654 noff = sizeof(struct ip6_hdr); 655 n->m_pkthdr.len = n->m_len = 656 noff + sizeof(struct icmp6_hdr); 657 /* 658 * Adjust mbuf. ip6_plen will be adjusted in 659 * ip6_output(). 660 */ 661 m_adj(n0, off + sizeof(struct icmp6_hdr)); 662 n->m_pkthdr.len += n0->m_pkthdr.len; 663 n->m_next = n0; 664 n0->m_flags &= ~M_PKTHDR; 665 } else { 666 nip6 = mtod(n, struct ip6_hdr *); 667 IP6_EXTHDR_GET(nicmp6, struct icmp6_hdr *, n, off, 668 sizeof(*nicmp6)); 669 noff = off; 670 } 671 if(nicmp6 == NULL) 672 panic("nicmp6 is NULL in %s, which isn't good!\n", __FUNCTION__); 673 else { 674 nicmp6->icmp6_type = ICMP6_ECHO_REPLY; 675 nicmp6->icmp6_code = 0; 676 } 677 if (n) { 678 icmp6stat.icp6s_reflect++; 679 icmp6stat.icp6s_outhist[ICMP6_ECHO_REPLY]++; 680 icmp6_reflect(n, noff); 681 } 682 goto rate_limit_checked; 683 break; 684 685 case ICMP6_ECHO_REPLY: 686 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echoreply); 687 if (code != 0) 688 goto badcode; 689 break; 690 691 case MLD_LISTENER_QUERY: 692 case MLD_LISTENER_REPORT: 693 694 if (icmp6len < sizeof(struct mld_hdr)) 695 goto badlen; 696 if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */ 697 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldquery); 698 else 699 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldreport); 700 701 if (icmp6_ratelimit(&ip6->ip6_dst, icmp6->icmp6_type, code)) { 702 icmp6stat.icp6s_toofreq++; 703 goto freeit; 704 } 705 706 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 707 /* give up local */ 708 if (mld_input(m, off, icmp6len) == IPPROTO_DONE) 709 m = NULL; 710 goto freeit; 711 } 712 if (mld_input(n, off, icmp6len) != IPPROTO_DONE) 713 m_freem(n); 714 /* m stays. */ 715 goto rate_limit_checked; 716 break; 717 718 case MLD_LISTENER_DONE: 719 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mlddone); 720 if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */ 721 goto badlen; 722 break; /* nothing to be done in kernel */ 723 724 case MLD_MTRACE_RESP: 725 case MLD_MTRACE: 726 /* XXX: these two are experimental. not officially defined. */ 727 /* XXX: per-interface statistics? */ 728 break; /* just pass it to applications */ 729 730 case ICMP6_NI_QUERY: 731 if (!icmp6_nodeinfo) 732 break; 733//### LD 10/20 Check fbsd differences here. Not sure we're more advanced or not. 734 /* By RFC 4620 refuse to answer queries from global scope addresses */ 735 if ((icmp6_nodeinfo & 8) != 8 && in6_addrscope(&ip6->ip6_src) == IPV6_ADDR_SCOPE_GLOBAL) 736 break; 737 738 if (icmp6len < sizeof(struct icmp6_nodeinfo)) 739 goto badlen; 740 741#ifndef PULLDOWN_TEST 742 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo), 743 return IPPROTO_DONE); 744#endif 745 if (icmp6_ratelimit(&ip6->ip6_dst, icmp6->icmp6_type, code)) { 746 icmp6stat.icp6s_toofreq++; 747 goto freeit; 748 } 749 750 n = m_copy(m, 0, M_COPYALL); 751 if (n) 752 n = ni6_input(n, off); 753 if (n) { 754 noff = sizeof(struct ip6_hdr); 755 icmp6stat.icp6s_reflect++; 756 icmp6stat.icp6s_outhist[ICMP6_WRUREPLY]++; 757 icmp6_reflect(n, noff); 758 } 759 goto rate_limit_checked; 760 break; 761 762 case ICMP6_WRUREPLY: 763 if (code != 0) 764 goto badcode; 765 break; 766 767 case ND_ROUTER_SOLICIT: 768 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routersolicit); 769 if (code != 0) 770 goto badcode; 771 if (icmp6len < sizeof(struct nd_router_solicit)) 772 goto badlen; 773 774 if (icmp6_ratelimit(&ip6->ip6_dst, icmp6->icmp6_type, code)) { 775 icmp6stat.icp6s_toofreq++; 776 goto freeit; 777 } 778 779 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 780 /* give up local */ 781 nd6_rs_input(m, off, icmp6len); 782 m = NULL; 783 goto freeit; 784 } 785 nd6_rs_input(n, off, icmp6len); 786 /* m stays. */ 787 goto rate_limit_checked; 788 break; 789 790 case ND_ROUTER_ADVERT: 791 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routeradvert); 792 if (code != 0) 793 goto badcode; 794 if (icmp6len < sizeof(struct nd_router_advert)) 795 goto badlen; 796 797 if (icmp6_ratelimit(&ip6->ip6_dst, icmp6->icmp6_type, code)) { 798 icmp6stat.icp6s_toofreq++; 799 goto freeit; 800 } 801 802 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 803 /* give up local */ 804 nd6_ra_input(m, off, icmp6len); 805 m = NULL; 806 goto freeit; 807 } 808 nd6_ra_input(n, off, icmp6len); 809 /* m stays. */ 810 goto rate_limit_checked; 811 break; 812 813 case ND_NEIGHBOR_SOLICIT: 814 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighborsolicit); 815 if (code != 0) 816 goto badcode; 817 if (icmp6len < sizeof(struct nd_neighbor_solicit)) 818 goto badlen; 819 820 if (icmp6_ratelimit(&ip6->ip6_dst, icmp6->icmp6_type, code)) { 821 icmp6stat.icp6s_toofreq++; 822 goto freeit; 823 } 824 825 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 826 /* give up local */ 827 nd6_ns_input(m, off, icmp6len); 828 m = NULL; 829 goto freeit; 830 } 831 nd6_ns_input(n, off, icmp6len); 832 /* m stays. */ 833 goto rate_limit_checked; 834 break; 835 836 case ND_NEIGHBOR_ADVERT: 837 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighboradvert); 838 if (code != 0) 839 goto badcode; 840 if (icmp6len < sizeof(struct nd_neighbor_advert)) 841 goto badlen; 842 843 if (icmp6_ratelimit(&ip6->ip6_dst, icmp6->icmp6_type, code)) { 844 icmp6stat.icp6s_toofreq++; 845 goto freeit; 846 } 847 848 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 849 /* give up local */ 850 nd6_na_input(m, off, icmp6len); 851 m = NULL; 852 goto freeit; 853 } 854 nd6_na_input(n, off, icmp6len); 855 /* m stays. */ 856 goto rate_limit_checked; 857 break; 858 859 case ND_REDIRECT: 860 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_redirect); 861 if (code != 0) 862 goto badcode; 863 if (icmp6len < sizeof(struct nd_redirect)) 864 goto badlen; 865 866 if (icmp6_ratelimit(&ip6->ip6_dst, icmp6->icmp6_type, code)) { 867 icmp6stat.icp6s_toofreq++; 868 goto freeit; 869 } 870 871 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 872 /* give up local */ 873 icmp6_redirect_input(m, off); 874 m = NULL; 875 goto freeit; 876 } 877 icmp6_redirect_input(n, off); 878 /* m stays. */ 879 goto rate_limit_checked; 880 break; 881 882 case ICMP6_ROUTER_RENUMBERING: 883 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND && 884 code != ICMP6_ROUTER_RENUMBERING_RESULT) 885 goto badcode; 886 if (icmp6len < sizeof(struct icmp6_router_renum)) 887 goto badlen; 888 break; 889 890 default: 891 if (icmp6_ratelimit(&ip6->ip6_dst, icmp6->icmp6_type, code)) { 892 icmp6stat.icp6s_toofreq++; 893 goto freeit; 894 } 895 896 nd6log((LOG_DEBUG, 897 "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n", 898 icmp6->icmp6_type, ip6_sprintf(&ip6->ip6_src), 899 ip6_sprintf(&ip6->ip6_dst), 900 m->m_pkthdr.rcvif ? m->m_pkthdr.rcvif->if_index : 0)); 901 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) { 902 /* ICMPv6 error: MUST deliver it by spec... */ 903 code = PRC_NCMDS; 904 /* deliver */ 905 } else { 906 /* ICMPv6 informational: MUST not deliver */ 907 goto rate_limit_checked; 908 break; 909 } 910 deliver: 911 if (icmp6_ratelimit(&ip6->ip6_dst, icmp6->icmp6_type, code)) { 912 icmp6stat.icp6s_toofreq++; 913 goto freeit; 914 } 915 916 if (icmp6_notify_error(m, off, icmp6len, code)) { 917 /* In this case, m should've been freed. */ 918 return(IPPROTO_DONE); 919 } 920 break; 921 922 badcode: 923 icmp6stat.icp6s_badcode++; 924 break; 925 926 badlen: 927 icmp6stat.icp6s_badlen++; 928 break; 929 } 930 931 if (icmp6_ratelimit(&ip6->ip6_dst, icmp6->icmp6_type, code)) { 932 icmp6stat.icp6s_toofreq++; 933 goto freeit; 934 } 935rate_limit_checked: 936 /* deliver the packet to appropriate sockets (unless proxying) */ 937 if (!proxy) { 938 icmp6_rip6_input(&m, *offp); 939 return IPPROTO_DONE; 940 } 941 942freeit: 943 m_freem(m); 944 return IPPROTO_DONE; 945} 946 947static int 948icmp6_notify_error(m, off, icmp6len, code) 949 struct mbuf *m; 950 int off, icmp6len, code; 951{ 952 struct icmp6_hdr *icmp6; 953 struct ip6_hdr *eip6; 954 u_int32_t notifymtu; 955 struct sockaddr_in6 icmp6src, icmp6dst; 956 957 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) { 958 icmp6stat.icp6s_tooshort++; 959 goto freeit; 960 } 961#ifndef PULLDOWN_TEST 962 IP6_EXTHDR_CHECK(m, off, 963 sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr), 964 return -1); 965 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 966#else 967 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 968 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 969 if (icmp6 == NULL) { 970 icmp6stat.icp6s_tooshort++; 971 return(-1); 972 } 973#endif 974 eip6 = (struct ip6_hdr *)(icmp6 + 1); 975 976 /* Detect the upper level protocol */ 977 { 978 void (*ctlfunc)(int, struct sockaddr *, void *); 979 u_int8_t nxt = eip6->ip6_nxt; 980 int eoff = off + sizeof(struct icmp6_hdr) + 981 sizeof(struct ip6_hdr); 982 struct ip6ctlparam ip6cp; 983 struct in6_addr *finaldst = NULL; 984 int icmp6type = icmp6->icmp6_type; 985 struct ip6_frag *fh; 986 struct ip6_rthdr *rth; 987 struct ip6_rthdr0 *rth0; 988 int rthlen; 989 990 while (1) { /* XXX: should avoid infinite loop explicitly? */ 991 struct ip6_ext *eh; 992 993 switch (nxt) { 994 case IPPROTO_HOPOPTS: 995 case IPPROTO_DSTOPTS: 996 case IPPROTO_AH: 997#ifndef PULLDOWN_TEST 998 IP6_EXTHDR_CHECK(m, 0, eoff + 999 sizeof(struct ip6_ext), 1000 return -1); 1001 eh = (struct ip6_ext *)(mtod(m, caddr_t) 1002 + eoff); 1003#else 1004 IP6_EXTHDR_GET(eh, struct ip6_ext *, m, 1005 eoff, sizeof(*eh)); 1006 if (eh == NULL) { 1007 icmp6stat.icp6s_tooshort++; 1008 return(-1); 1009 } 1010#endif 1011 1012 if (nxt == IPPROTO_AH) 1013 eoff += (eh->ip6e_len + 2) << 2; 1014 else 1015 eoff += (eh->ip6e_len + 1) << 3; 1016 nxt = eh->ip6e_nxt; 1017 break; 1018 case IPPROTO_ROUTING: 1019 /* 1020 * When the erroneous packet contains a 1021 * routing header, we should examine the 1022 * header to determine the final destination. 1023 * Otherwise, we can't properly update 1024 * information that depends on the final 1025 * destination (e.g. path MTU). 1026 */ 1027#ifndef PULLDOWN_TEST 1028 IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(*rth), 1029 return -1); 1030 rth = (struct ip6_rthdr *)(mtod(m, caddr_t) 1031 + eoff); 1032#else 1033 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m, 1034 eoff, sizeof(*rth)); 1035 if (rth == NULL) { 1036 icmp6stat.icp6s_tooshort++; 1037 return(-1); 1038 } 1039#endif 1040 rthlen = (rth->ip6r_len + 1) << 3; 1041 /* 1042 * XXX: currently there is no 1043 * officially defined type other 1044 * than type-0. 1045 * Note that if the segment left field 1046 * is 0, all intermediate hops must 1047 * have been passed. 1048 */ 1049 if (rth->ip6r_segleft && 1050 rth->ip6r_type == IPV6_RTHDR_TYPE_0) { 1051 int hops; 1052 1053#ifndef PULLDOWN_TEST 1054 IP6_EXTHDR_CHECK(m, 0, eoff + rthlen, 1055 return -1); 1056 rth0 = (struct ip6_rthdr0 *)(mtod(m, caddr_t) + eoff); 1057#else 1058 IP6_EXTHDR_GET(rth0, 1059 struct ip6_rthdr0 *, m, 1060 eoff, rthlen); 1061 if (rth0 == NULL) { 1062 icmp6stat.icp6s_tooshort++; 1063 return(-1); 1064 } 1065#endif 1066 /* just ignore a bogus header */ 1067 if ((rth0->ip6r0_len % 2) == 0 && 1068 (hops = rth0->ip6r0_len/2)) 1069 finaldst = (struct in6_addr *)(void *)(rth0 + 1) + (hops - 1); 1070 } 1071 eoff += rthlen; 1072 nxt = rth->ip6r_nxt; 1073 break; 1074 case IPPROTO_FRAGMENT: 1075#ifndef PULLDOWN_TEST 1076 IP6_EXTHDR_CHECK(m, 0, eoff + 1077 sizeof(struct ip6_frag), 1078 return -1); 1079 fh = (struct ip6_frag *)(mtod(m, caddr_t) 1080 + eoff); 1081#else 1082 IP6_EXTHDR_GET(fh, struct ip6_frag *, m, 1083 eoff, sizeof(*fh)); 1084 if (fh == NULL) { 1085 icmp6stat.icp6s_tooshort++; 1086 return (-1); 1087 } 1088#endif 1089 /* 1090 * Data after a fragment header is meaningless 1091 * unless it is the first fragment, but 1092 * we'll go to the notify label for path MTU 1093 * discovery. 1094 */ 1095 if (fh->ip6f_offlg & IP6F_OFF_MASK) 1096 goto notify; 1097 1098 eoff += sizeof(struct ip6_frag); 1099 nxt = fh->ip6f_nxt; 1100 break; 1101 default: 1102 /* 1103 * This case includes ESP and the No Next 1104 * Header. In such cases going to the notify 1105 * label does not have any meaning 1106 * (i.e. ctlfunc will be NULL), but we go 1107 * anyway since we might have to update 1108 * path MTU information. 1109 */ 1110 goto notify; 1111 } 1112 } 1113 notify: 1114#ifndef PULLDOWN_TEST 1115 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 1116#else 1117 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 1118 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 1119 if (icmp6 == NULL) { 1120 icmp6stat.icp6s_tooshort++; 1121 return (-1); 1122 } 1123#endif 1124 1125 /* 1126 * retrieve parameters from the inner IPv6 header, and convert 1127 * them into sockaddr structures. 1128 * XXX: there is no guarantee that the source or destination 1129 * addresses of the inner packet are in the same scope as 1130 * the addresses of the icmp packet. But there is no other 1131 * way to determine the zone. 1132 */ 1133 eip6 = (struct ip6_hdr *)(icmp6 + 1); 1134 1135 bzero(&icmp6dst, sizeof(icmp6dst)); 1136 icmp6dst.sin6_len = sizeof(struct sockaddr_in6); 1137 icmp6dst.sin6_family = AF_INET6; 1138 if (finaldst == NULL) 1139 icmp6dst.sin6_addr = eip6->ip6_dst; 1140 else 1141 icmp6dst.sin6_addr = *finaldst; 1142 if (in6_setscope(&icmp6dst.sin6_addr, m->m_pkthdr.rcvif, NULL)) 1143 goto freeit; 1144 bzero(&icmp6src, sizeof(icmp6src)); 1145 icmp6src.sin6_len = sizeof(struct sockaddr_in6); 1146 icmp6src.sin6_family = AF_INET6; 1147 icmp6src.sin6_addr = eip6->ip6_src; 1148 if (in6_setscope(&icmp6src.sin6_addr, m->m_pkthdr.rcvif, NULL)) 1149 goto freeit; 1150 icmp6src.sin6_flowinfo = 1151 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK); 1152 1153 if (finaldst == NULL) 1154 finaldst = &eip6->ip6_dst; 1155 ip6cp.ip6c_m = m; 1156 ip6cp.ip6c_icmp6 = icmp6; 1157 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1); 1158 ip6cp.ip6c_off = eoff; 1159 ip6cp.ip6c_finaldst = finaldst; 1160 ip6cp.ip6c_src = &icmp6src; 1161 ip6cp.ip6c_nxt = nxt; 1162 1163 if (icmp6type == ICMP6_PACKET_TOO_BIG) { 1164 notifymtu = ntohl(icmp6->icmp6_mtu); 1165 ip6cp.ip6c_cmdarg = (void *)¬ifymtu; 1166 icmp6_mtudisc_update(&ip6cp, 1); /*XXX*/ 1167 } 1168 1169 ctlfunc = (void (*)(int, struct sockaddr *, void *)) 1170 (ip6_protox[nxt]->pr_ctlinput); 1171 if (ctlfunc) { 1172 (void) (*ctlfunc)(code, (struct sockaddr *)&icmp6dst, 1173 &ip6cp); 1174 } 1175 } 1176 return(0); 1177 1178freeit: 1179 m_freem(m); 1180 return(-1); 1181} 1182 1183void 1184icmp6_mtudisc_update(ip6cp, validated) 1185 struct ip6ctlparam *ip6cp; 1186 int validated; 1187{ 1188 struct in6_addr *dst = ip6cp->ip6c_finaldst; 1189 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6; 1190 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */ 1191 u_int mtu = ntohl(icmp6->icmp6_mtu); 1192 struct rtentry *rt = NULL; 1193 struct sockaddr_in6 sin6; 1194 /* 1195 * we reject ICMPv6 too big with abnormally small value. 1196 * XXX what is the good definition of "abnormally small"? 1197 */ 1198 if (mtu < sizeof(struct ip6_hdr) + sizeof(struct ip6_frag) + 8) 1199 return; 1200 1201 if (!validated) 1202 return; 1203 1204 /* 1205 * In case the suggested mtu is less than IPV6_MMTU, we 1206 * only need to remember that it was for above mentioned 1207 * "alwaysfrag" case. 1208 * Try to be as close to the spec as possible. 1209 */ 1210 if (mtu < IPV6_MMTU) 1211 mtu = IPV6_MMTU - 8; 1212 1213 bzero(&sin6, sizeof(sin6)); 1214 sin6.sin6_family = PF_INET6; 1215 sin6.sin6_len = sizeof(struct sockaddr_in6); 1216 sin6.sin6_addr = *dst; 1217 /* XXX normally, this won't happen */ 1218 if (IN6_IS_ADDR_LINKLOCAL(dst)) { 1219 sin6.sin6_addr.s6_addr16[1] = 1220 htons(m->m_pkthdr.rcvif->if_index); 1221 } 1222 /* sin6.sin6_scope_id = XXX: should be set if DST is a scoped addr */ 1223 rt = rtalloc1_scoped((struct sockaddr *)&sin6, 0, 1224 RTF_CLONING | RTF_PRCLONING, m->m_pkthdr.rcvif->if_index); 1225 if (rt != NULL) { 1226 RT_LOCK(rt); 1227 if ((rt->rt_flags & RTF_HOST) && 1228 !(rt->rt_rmx.rmx_locks & RTV_MTU) && 1229 mtu < IN6_LINKMTU(rt->rt_ifp) && 1230 rt->rt_rmx.rmx_mtu > mtu) { 1231 icmp6stat.icp6s_pmtuchg++; 1232 rt->rt_rmx.rmx_mtu = mtu; 1233 } 1234 RT_UNLOCK(rt); 1235 rtfree(rt); 1236 } 1237} 1238 1239/* 1240 * Process a Node Information Query packet, based on 1241 * draft-ietf-ipngwg-icmp-name-lookups-07. 1242 * 1243 * Spec incompatibilities: 1244 * - IPv6 Subject address handling 1245 * - IPv4 Subject address handling support missing 1246 * - Proxy reply (answer even if it's not for me) 1247 * - joins NI group address at in6_ifattach() time only, does not cope 1248 * with hostname changes by sethostname(3) 1249 */ 1250#define hostnamelen strlen(hostname) 1251static struct mbuf * 1252ni6_input(m, off) 1253 struct mbuf *m; 1254 int off; 1255{ 1256 struct icmp6_nodeinfo *ni6, *nni6; 1257 struct mbuf *n = NULL; 1258 u_int16_t qtype; 1259 int subjlen; 1260 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1261 struct ni_reply_fqdn *fqdn; 1262 int addrs; /* for NI_QTYPE_NODEADDR */ 1263 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */ 1264 struct sockaddr_in6 sin6; /* double meaning; ip6_dst and subjectaddr */ 1265 struct sockaddr_in6 sin6_d; /* XXX: we should retrieve this from m_aux */ 1266 struct ip6_hdr *ip6; 1267 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */ 1268 char *subj = NULL; 1269 1270 ip6 = mtod(m, struct ip6_hdr *); 1271#ifndef PULLDOWN_TEST 1272 ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off); 1273#else 1274 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6)); 1275 if (ni6 == NULL) { 1276 /* m is already reclaimed */ 1277 return (NULL); 1278 } 1279#endif 1280 1281 /* 1282 * Validate IPv6 source address. 1283 * The default configuration MUST be to refuse answering queries from 1284 * global-scope addresses according to RFC4602. 1285 * Notes: 1286 * - it's not very clear what "refuse" means; this implementation 1287 * simply drops it. 1288 * - it's not very easy to identify global-scope (unicast) addresses 1289 * since there are many prefixes for them. It should be safer 1290 * and in practice sufficient to check "all" but loopback and 1291 * link-local (note that site-local unicast was deprecated and 1292 * ULA is defined as global scope-wise) 1293 */ 1294 if ((icmp6_nodeinfo & ICMP6_NODEINFO_GLOBALOK) == 0 && 1295 !IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) && 1296 !IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src)) 1297 goto bad; 1298 1299 /* 1300 * Validate IPv6 destination address. 1301 * 1302 * The Responder must discard the Query without further processing 1303 * unless it is one of the Responder's unicast or anycast addresses, or 1304 * a link-local scope multicast address which the Responder has joined. 1305 * [RFC4602, Section 5.] 1306 */ 1307 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 1308 if (!IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) 1309 goto bad; 1310 /* else it's a link-local multicast, fine */ 1311 } else { /* unicast or anycast */ 1312 struct in6_ifaddr *ia6; 1313 1314 if ((ia6 = ip6_getdstifaddr(m)) == NULL) 1315 goto bad; /* XXX impossible */ 1316 1317 IFA_LOCK(&ia6->ia_ifa); 1318 if ((ia6->ia6_flags & IN6_IFF_TEMPORARY) && 1319 !(icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK)) { 1320 nd6log((LOG_DEBUG, "ni6_input: ignore node info to " 1321 "a temporary address in %s:%d", 1322 __FILE__, __LINE__)); 1323 IFA_UNLOCK(&ia6->ia_ifa); 1324 IFA_REMREF(&ia6->ia_ifa); 1325 goto bad; 1326 } 1327 IFA_UNLOCK(&ia6->ia_ifa); 1328 IFA_REMREF(&ia6->ia_ifa); 1329 } 1330 1331 /* validate query Subject field. */ 1332 qtype = ntohs(ni6->ni_qtype); 1333 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo); 1334 switch (qtype) { 1335 case NI_QTYPE_NOOP: 1336 case NI_QTYPE_SUPTYPES: 1337 /* 07 draft */ 1338 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0) 1339 break; 1340 /* FALLTHROUGH */ 1341 case NI_QTYPE_FQDN: 1342 case NI_QTYPE_NODEADDR: 1343 case NI_QTYPE_IPV4ADDR: 1344 switch (ni6->ni_code) { 1345 case ICMP6_NI_SUBJ_IPV6: 1346#if ICMP6_NI_SUBJ_IPV6 != 0 1347 case 0: 1348#endif 1349 /* 1350 * backward compatibility - try to accept 03 draft 1351 * format, where no Subject is present. 1352 */ 1353 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 && 1354 subjlen == 0) { 1355 oldfqdn++; 1356 break; 1357 } 1358#if ICMP6_NI_SUBJ_IPV6 != 0 1359 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6) 1360 goto bad; 1361#endif 1362 1363 if (subjlen != sizeof(struct in6_addr)) 1364 goto bad; 1365 1366 /* 1367 * Validate Subject address. 1368 * 1369 * Not sure what exactly "address belongs to the node" 1370 * means in the spec, is it just unicast, or what? 1371 * 1372 * At this moment we consider Subject address as 1373 * "belong to the node" if the Subject address equals 1374 * to the IPv6 destination address; validation for 1375 * IPv6 destination address should have done enough 1376 * check for us. 1377 * 1378 * We do not do proxy at this moment. 1379 */ 1380 /* m_pulldown instead of copy? */ 1381 m_copydata(m, off + sizeof(struct icmp6_nodeinfo), 1382 subjlen, (caddr_t)&sin6.sin6_addr); 1383 sin6.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif, 1384 &sin6.sin6_addr); 1385 in6_embedscope(&sin6.sin6_addr, &sin6, NULL, NULL, 1386 NULL); 1387 bzero(&sin6_d, sizeof(sin6_d)); 1388 sin6_d.sin6_family = AF_INET6; /* not used, actually */ 1389 sin6_d.sin6_len = sizeof(sin6_d); /* ditto */ 1390 sin6_d.sin6_addr = ip6->ip6_dst; 1391 sin6_d.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif, 1392 &ip6->ip6_dst); 1393 in6_embedscope(&sin6_d.sin6_addr, &sin6_d, NULL, NULL, 1394 NULL); 1395 subj = (char *)&sin6; 1396 if (SA6_ARE_ADDR_EQUAL(&sin6, &sin6_d)) 1397 break; 1398 1399 /* 1400 * XXX if we are to allow other cases, we should really 1401 * be careful about scope here. 1402 * basically, we should disallow queries toward IPv6 1403 * destination X with subject Y, 1404 * if scope(X) > scope(Y). 1405 * if we allow scope(X) > scope(Y), it will result in 1406 * information leakage across scope boundary. 1407 */ 1408 goto bad; 1409 1410 case ICMP6_NI_SUBJ_FQDN: 1411 /* 1412 * Validate Subject name with gethostname(3). 1413 * 1414 * The behavior may need some debate, since: 1415 * - we are not sure if the node has FQDN as 1416 * hostname (returned by gethostname(3)). 1417 * - the code does wildcard match for truncated names. 1418 * however, we are not sure if we want to perform 1419 * wildcard match, if gethostname(3) side has 1420 * truncated hostname. 1421 */ 1422 n = ni6_nametodns(hostname, hostnamelen, 0); 1423 if (!n || n->m_next || n->m_len == 0) 1424 goto bad; 1425 IP6_EXTHDR_GET(subj, char *, m, 1426 off + sizeof(struct icmp6_nodeinfo), subjlen); 1427 if (subj == NULL) 1428 goto bad; 1429 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *), 1430 n->m_len)) { 1431 goto bad; 1432 } 1433 m_freem(n); 1434 n = NULL; 1435 break; 1436 1437 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */ 1438 default: 1439 goto bad; 1440 } 1441 break; 1442 } 1443 1444 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */ 1445 switch (qtype) { 1446 case NI_QTYPE_FQDN: 1447 if ((icmp6_nodeinfo & ICMP6_NODEINFO_FQDNOK) == 0) 1448 goto bad; 1449 break; 1450 case NI_QTYPE_NODEADDR: 1451 case NI_QTYPE_IPV4ADDR: 1452 if ((icmp6_nodeinfo & ICMP6_NODEINFO_NODEADDROK) == 0) 1453 goto bad; 1454 break; 1455 } 1456 1457 /* guess reply length */ 1458 switch (qtype) { 1459 case NI_QTYPE_NOOP: 1460 break; /* no reply data */ 1461 case NI_QTYPE_SUPTYPES: 1462 replylen += sizeof(u_int32_t); 1463 break; 1464 case NI_QTYPE_FQDN: 1465 /* XXX will append an mbuf */ 1466 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1467 break; 1468 case NI_QTYPE_NODEADDR: 1469 addrs = ni6_addrs(ni6, &ifp, subj); 1470 if ((replylen += addrs * (sizeof(struct in6_addr) + 1471 sizeof(u_int32_t))) > MCLBYTES) 1472 replylen = MCLBYTES; /* XXX: will truncate pkt later */ 1473 break; 1474 case NI_QTYPE_IPV4ADDR: 1475 /* unsupported - should respond with unknown Qtype? */ 1476 break; 1477 default: 1478 /* 1479 * XXX: We must return a reply with the ICMP6 code 1480 * `unknown Qtype' in this case. However we regard the case 1481 * as an FQDN query for backward compatibility. 1482 * Older versions set a random value to this field, 1483 * so it rarely varies in the defined qtypes. 1484 * But the mechanism is not reliable... 1485 * maybe we should obsolete older versions. 1486 */ 1487 qtype = NI_QTYPE_FQDN; 1488 /* XXX will append an mbuf */ 1489 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1490 oldfqdn++; 1491 break; 1492 } 1493 1494 /* allocate an mbuf to reply. */ 1495 MGETHDR(n, M_DONTWAIT, m->m_type); /* MAC-OK */ 1496 if (n == NULL) { 1497 m_freem(m); 1498 if (ifp != NULL) 1499 ifnet_release(ifp); 1500 return (NULL); 1501 } 1502 M_COPY_PKTHDR(n, m); /* just for recvif */ 1503 if (replylen > MHLEN) { 1504 if (replylen > MCLBYTES) { 1505 /* 1506 * XXX: should we try to allocate more? But MCLBYTES 1507 * is probably much larger than IPV6_MMTU... 1508 */ 1509 goto bad; 1510 } 1511 MCLGET(n, M_DONTWAIT); 1512 if ((n->m_flags & M_EXT) == 0) { 1513 goto bad; 1514 } 1515 } 1516 n->m_pkthdr.len = n->m_len = replylen; 1517 1518 /* copy mbuf header and IPv6 + Node Information base headers */ 1519 bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr)); 1520 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1); 1521 bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo)); 1522 1523 /* qtype dependent procedure */ 1524 switch (qtype) { 1525 case NI_QTYPE_NOOP: 1526 nni6->ni_code = ICMP6_NI_SUCCESS; 1527 nni6->ni_flags = 0; 1528 break; 1529 case NI_QTYPE_SUPTYPES: 1530 { 1531 u_int32_t v; 1532 nni6->ni_code = ICMP6_NI_SUCCESS; 1533 nni6->ni_flags = htons(0x0000); /* raw bitmap */ 1534 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */ 1535 v = (u_int32_t)htonl(0x0000000f); 1536 bcopy(&v, nni6 + 1, sizeof(u_int32_t)); 1537 break; 1538 } 1539 case NI_QTYPE_FQDN: 1540 nni6->ni_code = ICMP6_NI_SUCCESS; 1541 fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) + 1542 sizeof(struct ip6_hdr) + 1543 sizeof(struct icmp6_nodeinfo)); 1544 nni6->ni_flags = 0; /* XXX: meaningless TTL */ 1545 fqdn->ni_fqdn_ttl = 0; /* ditto. */ 1546 /* 1547 * XXX do we really have FQDN in variable "hostname"? 1548 */ 1549 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn); 1550 if (n->m_next == NULL) 1551 goto bad; 1552 /* XXX we assume that n->m_next is not a chain */ 1553 if (n->m_next->m_next != NULL) 1554 goto bad; 1555 n->m_pkthdr.len += n->m_next->m_len; 1556 break; 1557 case NI_QTYPE_NODEADDR: 1558 { 1559 int lenlim, copied; 1560 1561 nni6->ni_code = ICMP6_NI_SUCCESS; 1562 n->m_pkthdr.len = n->m_len = 1563 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1564 lenlim = M_TRAILINGSPACE(n); 1565 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim); 1566 /* XXX: reset mbuf length */ 1567 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 1568 sizeof(struct icmp6_nodeinfo) + copied; 1569 break; 1570 } 1571 default: 1572 break; /* XXX impossible! */ 1573 } 1574 1575 nni6->ni_type = ICMP6_NI_REPLY; 1576 m_freem(m); 1577 if (ifp != NULL) 1578 ifnet_release(ifp); 1579 return (n); 1580 1581bad: 1582 m_freem(m); 1583 if (n) 1584 m_freem(n); 1585 if (ifp != NULL) 1586 ifnet_release(ifp); 1587 return (NULL); 1588} 1589#undef hostnamelen 1590 1591/* 1592 * make a mbuf with DNS-encoded string. no compression support. 1593 * 1594 * XXX names with less than 2 dots (like "foo" or "foo.section") will be 1595 * treated as truncated name (two \0 at the end). this is a wild guess. 1596 */ 1597static struct mbuf * 1598ni6_nametodns(name, namelen, old) 1599 const char *name; 1600 int namelen; 1601 int old; /* return pascal string if non-zero */ 1602{ 1603 struct mbuf *m; 1604 char *cp, *ep; 1605 const char *p, *q; 1606 int i, len, nterm; 1607 1608 if (old) 1609 len = namelen + 1; 1610 else 1611 len = MCLBYTES; 1612 1613 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */ 1614 MGET(m, M_DONTWAIT, MT_DATA); 1615 if (m && len > MLEN) { 1616 MCLGET(m, M_DONTWAIT); 1617 if ((m->m_flags & M_EXT) == 0) 1618 goto fail; 1619 } 1620 if (!m) 1621 goto fail; 1622 m->m_next = NULL; 1623 1624 if (old) { 1625 m->m_len = len; 1626 *mtod(m, char *) = namelen; 1627 bcopy(name, mtod(m, char *) + 1, namelen); 1628 return m; 1629 } else { 1630 m->m_len = 0; 1631 cp = mtod(m, char *); 1632 ep = mtod(m, char *) + M_TRAILINGSPACE(m); 1633 1634 /* if not certain about my name, return empty buffer */ 1635 if (namelen == 0) 1636 return m; 1637 1638 /* 1639 * guess if it looks like shortened hostname, or FQDN. 1640 * shortened hostname needs two trailing "\0". 1641 */ 1642 i = 0; 1643 for (p = name; p < name + namelen; p++) { 1644 if (*p && *p == '.') 1645 i++; 1646 } 1647 if (i < 2) 1648 nterm = 2; 1649 else 1650 nterm = 1; 1651 1652 p = name; 1653 while (cp < ep && p < name + namelen) { 1654 i = 0; 1655 for (q = p; q < name + namelen && *q && *q != '.'; q++) 1656 i++; 1657 /* result does not fit into mbuf */ 1658 if (cp + i + 1 >= ep) 1659 goto fail; 1660 /* 1661 * DNS label length restriction, RFC1035 page 8. 1662 * "i == 0" case is included here to avoid returning 1663 * 0-length label on "foo..bar". 1664 */ 1665 if (i <= 0 || i >= 64) 1666 goto fail; 1667 *cp++ = i; 1668 bcopy(p, cp, i); 1669 cp += i; 1670 p = q; 1671 if (p < name + namelen && *p == '.') 1672 p++; 1673 } 1674 /* termination */ 1675 if (cp + nterm >= ep) 1676 goto fail; 1677 while (nterm-- > 0) 1678 *cp++ = '\0'; 1679 m->m_len = cp - mtod(m, char *); 1680 return m; 1681 } 1682 1683 panic("should not reach here"); 1684 /* NOTREACHED */ 1685 1686 fail: 1687 if (m) 1688 m_freem(m); 1689 return NULL; 1690} 1691 1692/* 1693 * check if two DNS-encoded string matches. takes care of truncated 1694 * form (with \0\0 at the end). no compression support. 1695 * XXX upper/lowercase match (see RFC2065) 1696 */ 1697static int 1698ni6_dnsmatch(a, alen, b, blen) 1699 const char *a; 1700 int alen; 1701 const char *b; 1702 int blen; 1703{ 1704 const char *a0, *b0; 1705 int l; 1706 1707 /* simplest case - need validation? */ 1708 if (alen == blen && bcmp(a, b, alen) == 0) 1709 return 1; 1710 1711 a0 = a; 1712 b0 = b; 1713 1714 /* termination is mandatory */ 1715 if (alen < 2 || blen < 2) 1716 return 0; 1717 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0') 1718 return 0; 1719 alen--; 1720 blen--; 1721 1722 while (a - a0 < alen && b - b0 < blen) { 1723 if (a - a0 + 1 > alen || b - b0 + 1 > blen) 1724 return 0; 1725 1726 if ((signed char)a[0] < 0 || (signed char)b[0] < 0) 1727 return 0; 1728 /* we don't support compression yet */ 1729 if (a[0] >= 64 || b[0] >= 64) 1730 return 0; 1731 1732 /* truncated case */ 1733 if (a[0] == 0 && a - a0 == alen - 1) 1734 return 1; 1735 if (b[0] == 0 && b - b0 == blen - 1) 1736 return 1; 1737 if (a[0] == 0 || b[0] == 0) 1738 return 0; 1739 1740 if (a[0] != b[0]) 1741 return 0; 1742 l = a[0]; 1743 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen) 1744 return 0; 1745 if (bcmp(a + 1, b + 1, l) != 0) 1746 return 0; 1747 1748 a += 1 + l; 1749 b += 1 + l; 1750 } 1751 1752 if (a - a0 == alen && b - b0 == blen) 1753 return 1; 1754 else 1755 return 0; 1756} 1757 1758/* 1759 * calculate the number of addresses to be returned in the node info reply. 1760 */ 1761static int 1762ni6_addrs(ni6, ifpp, subj) 1763 struct icmp6_nodeinfo *ni6; 1764 struct ifnet **ifpp; 1765 char *subj; 1766{ 1767 struct ifnet *ifp; 1768 struct in6_ifaddr *ifa6; 1769 struct ifaddr *ifa; 1770 struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */ 1771 int addrs = 0, addrsofif, iffound = 0; 1772 int niflags = ni6->ni_flags; 1773 1774 if (ifpp != NULL) 1775 *ifpp = NULL; 1776 1777 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) { 1778 switch (ni6->ni_code) { 1779 case ICMP6_NI_SUBJ_IPV6: 1780 if (subj == NULL) /* must be impossible... */ 1781 return(0); 1782 subj_ip6 = (struct sockaddr_in6 *)(void *)subj; 1783 break; 1784 default: 1785 /* 1786 * XXX: we only support IPv6 subject address for 1787 * this Qtype. 1788 */ 1789 return (0); 1790 } 1791 } 1792 1793 ifnet_head_lock_shared(); 1794 TAILQ_FOREACH(ifp, &ifnet_head, if_list) { 1795 addrsofif = 0; 1796 ifnet_lock_shared(ifp); 1797 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 1798 { 1799 IFA_LOCK(ifa); 1800 if (ifa->ifa_addr->sa_family != AF_INET6) { 1801 IFA_UNLOCK(ifa); 1802 continue; 1803 } 1804 ifa6 = (struct in6_ifaddr *)ifa; 1805 1806 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 && 1807 IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr, 1808 &ifa6->ia_addr.sin6_addr)) 1809 iffound = 1; 1810 1811 /* 1812 * IPv4-mapped addresses can only be returned by a 1813 * Node Information proxy, since they represent 1814 * addresses of IPv4-only nodes, which perforce do 1815 * not implement this protocol. 1816 * [icmp-name-lookups-07, Section 5.4] 1817 * So we don't support NI_NODEADDR_FLAG_COMPAT in 1818 * this function at this moment. 1819 */ 1820 1821 /* What do we have to do about ::1? */ 1822 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) { 1823 case IPV6_ADDR_SCOPE_LINKLOCAL: 1824 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) { 1825 IFA_UNLOCK(ifa); 1826 continue; 1827 } 1828 break; 1829 case IPV6_ADDR_SCOPE_SITELOCAL: 1830 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) { 1831 IFA_UNLOCK(ifa); 1832 continue; 1833 } 1834 break; 1835 case IPV6_ADDR_SCOPE_GLOBAL: 1836 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) { 1837 IFA_UNLOCK(ifa); 1838 continue; 1839 } 1840 break; 1841 default: 1842 IFA_UNLOCK(ifa); 1843 continue; 1844 } 1845 1846 /* 1847 * check if anycast is okay. 1848 * XXX: just experimental. not in the spec. 1849 */ 1850 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1851 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) { 1852 IFA_UNLOCK(ifa); 1853 continue; /* we need only unicast addresses */ 1854 } 1855 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 && 1856 (icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK) == 0) { 1857 IFA_UNLOCK(ifa); 1858 continue; 1859 } 1860 addrsofif++; /* count the address */ 1861 IFA_UNLOCK(ifa); 1862 } 1863 ifnet_lock_done(ifp); 1864 if (iffound) { 1865 if (ifpp != NULL) { 1866 *ifpp = ifp; 1867 ifnet_reference(ifp); 1868 } 1869 ifnet_head_done(); 1870 return(addrsofif); 1871 } 1872 1873 addrs += addrsofif; 1874 } 1875 ifnet_head_done(); 1876 1877 return (addrs); 1878} 1879 1880static int 1881ni6_store_addrs(ni6, nni6, ifp0, resid) 1882 struct icmp6_nodeinfo *ni6, *nni6; 1883 struct ifnet *ifp0; 1884 int resid; 1885{ 1886 struct ifnet *ifp = ifp0; 1887 struct in6_ifaddr *ifa6; 1888 struct ifaddr *ifa; 1889 struct ifnet *ifp_dep = NULL; 1890 int copied = 0, allow_deprecated = 0; 1891 u_char *cp = (u_char *)(nni6 + 1); 1892 int niflags = ni6->ni_flags; 1893 u_int32_t ltime; 1894 struct timeval timenow; 1895 1896 getmicrotime(&timenow); 1897 1898 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL)) 1899 return (0); /* needless to copy */ 1900 1901 again: 1902 1903 ifnet_head_lock_shared(); 1904 if (ifp == NULL) 1905 ifp = TAILQ_FIRST(&ifnet_head); 1906 1907 for (; ifp; ifp = TAILQ_NEXT(ifp, if_list)) { 1908 ifnet_lock_shared(ifp); 1909 for (ifa = ifp->if_addrlist.tqh_first; ifa; 1910 ifa = ifa->ifa_list.tqe_next) { 1911 IFA_LOCK(ifa); 1912 if (ifa->ifa_addr->sa_family != AF_INET6) { 1913 IFA_UNLOCK(ifa); 1914 continue; 1915 } 1916 ifa6 = (struct in6_ifaddr *)ifa; 1917 1918 if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) != 0 && 1919 allow_deprecated == 0) { 1920 /* 1921 * prefererred address should be put before 1922 * deprecated addresses. 1923 */ 1924 1925 /* record the interface for later search */ 1926 if (ifp_dep == NULL) 1927 ifp_dep = ifp; 1928 1929 IFA_UNLOCK(ifa); 1930 continue; 1931 } else if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) == 0 && 1932 allow_deprecated != 0) { 1933 IFA_UNLOCK(ifa); 1934 continue; /* we now collect deprecated addrs */ 1935 } 1936 /* What do we have to do about ::1? */ 1937 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) { 1938 case IPV6_ADDR_SCOPE_LINKLOCAL: 1939 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) { 1940 IFA_UNLOCK(ifa); 1941 continue; 1942 } 1943 break; 1944 case IPV6_ADDR_SCOPE_SITELOCAL: 1945 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) { 1946 IFA_UNLOCK(ifa); 1947 continue; 1948 } 1949 break; 1950 case IPV6_ADDR_SCOPE_GLOBAL: 1951 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) { 1952 IFA_UNLOCK(ifa); 1953 continue; 1954 } 1955 break; 1956 default: 1957 IFA_UNLOCK(ifa); 1958 continue; 1959 } 1960 1961 /* 1962 * check if anycast is okay. 1963 * XXX: just experimental. not in the spec. 1964 */ 1965 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1966 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) { 1967 IFA_UNLOCK(ifa); 1968 continue; 1969 } 1970 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 && 1971 (icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK) == 0) { 1972 IFA_UNLOCK(ifa); 1973 continue; 1974 } 1975 1976 /* now we can copy the address */ 1977 if (resid < sizeof(struct in6_addr) + 1978 sizeof(u_int32_t)) { 1979 IFA_UNLOCK(ifa); 1980 /* 1981 * We give up much more copy. 1982 * Set the truncate flag and return. 1983 */ 1984 nni6->ni_flags |= 1985 NI_NODEADDR_FLAG_TRUNCATE; 1986 ifnet_lock_done(ifp); 1987 ifnet_head_done(); 1988 return(copied); 1989 } 1990 1991 /* 1992 * Set the TTL of the address. 1993 * The TTL value should be one of the following 1994 * according to the specification: 1995 * 1996 * 1. The remaining lifetime of a DHCP lease on the 1997 * address, or 1998 * 2. The remaining Valid Lifetime of a prefix from 1999 * which the address was derived through Stateless 2000 * Autoconfiguration. 2001 * 2002 * Note that we currently do not support stateful 2003 * address configuration by DHCPv6, so the former 2004 * case can't happen. 2005 */ 2006 if (ifa6->ia6_lifetime.ia6t_expire == 0 && 2007 (ifa6->ia6_flags & IN6_IFF_TEMPORARY) == 0) 2008 ltime = ND6_INFINITE_LIFETIME; 2009 else { 2010 if (ifa6->ia6_lifetime.ia6t_expire > 2011 timenow.tv_sec) 2012 ltime = htonl(ifa6->ia6_lifetime.ia6t_expire - timenow.tv_sec); 2013 else 2014 ltime = 0; 2015 } 2016 2017 bcopy(<ime, cp, sizeof(u_int32_t)); 2018 cp += sizeof(u_int32_t); 2019 2020 /* copy the address itself */ 2021 bcopy(&ifa6->ia_addr.sin6_addr, cp, 2022 sizeof(struct in6_addr)); 2023 /* XXX: KAME link-local hack; remove ifindex */ 2024 if (IN6_IS_ADDR_LINKLOCAL(&ifa6->ia_addr.sin6_addr)) 2025 ((struct in6_addr *)(void *)cp)->s6_addr16[1] = 0; 2026 cp += sizeof(struct in6_addr); 2027 2028 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t)); 2029 copied += (sizeof(struct in6_addr) + 2030 sizeof(u_int32_t)); 2031 IFA_UNLOCK(ifa); 2032 } 2033 ifnet_lock_done(ifp); 2034 if (ifp0) /* we need search only on the specified IF */ 2035 break; 2036 } 2037 ifnet_head_done(); 2038 2039 if (allow_deprecated == 0 && ifp_dep != NULL) { 2040 ifp = ifp_dep; 2041 allow_deprecated = 1; 2042 2043 goto again; 2044 } 2045 2046 return(copied); 2047} 2048 2049/* 2050 * XXX almost dup'ed code with rip6_input. 2051 */ 2052static int 2053icmp6_rip6_input(mp, off) 2054 struct mbuf **mp; 2055 int off; 2056{ 2057 struct mbuf *m = *mp; 2058 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 2059 struct in6pcb *in6p; 2060 struct in6pcb *last = NULL; 2061 struct sockaddr_in6 rip6src; 2062 struct icmp6_hdr *icmp6; 2063 struct mbuf *opts = NULL; 2064 int ret = 0; 2065 2066#ifndef PULLDOWN_TEST 2067 /* this is assumed to be safe. */ 2068 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off); 2069#else 2070 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 2071 if (icmp6 == NULL) { 2072 /* m is already reclaimed */ 2073 return IPPROTO_DONE; 2074 } 2075#endif 2076 2077 /* 2078 * XXX: the address may have embedded scope zone ID, which should be 2079 * hidden from applications. 2080 */ 2081 bzero(&rip6src, sizeof(rip6src)); 2082 rip6src.sin6_family = AF_INET6; 2083 rip6src.sin6_len = sizeof(struct sockaddr_in6); 2084 rip6src.sin6_addr = ip6->ip6_src; 2085 if (sa6_recoverscope(&rip6src, TRUE)) 2086 return (IPPROTO_DONE); 2087 2088 lck_rw_lock_shared(ripcbinfo.mtx); 2089 LIST_FOREACH(in6p, &ripcb, inp_list) 2090 { 2091 if ((in6p->inp_vflag & INP_IPV6) == 0) 2092 continue; 2093 if (in6p->in6p_ip6_nxt != IPPROTO_ICMPV6) 2094 continue; 2095 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && 2096 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst)) 2097 continue; 2098 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) && 2099 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src)) 2100 continue; 2101 if (in6p->in6p_icmp6filt 2102 && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type, 2103 in6p->in6p_icmp6filt)) 2104 continue; 2105 if (last) { 2106 struct mbuf *n; 2107 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { 2108 if ((last->in6p_flags & IN6P_CONTROLOPTS) != 0 || 2109 (last->in6p_socket->so_options & SO_TIMESTAMP) != 0 || 2110 (last->in6p_socket->so_options & SO_TIMESTAMP_MONOTONIC) != 0) { 2111 ret = ip6_savecontrol(last, n, &opts); 2112 if (ret != 0) { 2113 m_freem(n); 2114 m_freem(opts); 2115 last = in6p; 2116 continue; 2117 } 2118 } 2119 /* strip intermediate headers */ 2120 m_adj(n, off); 2121 so_recv_data_stat(last->in6p_socket, m, 0); 2122 if (sbappendaddr(&last->in6p_socket->so_rcv, 2123 (struct sockaddr *)&rip6src, 2124 n, opts, NULL) != 0) { 2125 sorwakeup(last->in6p_socket); 2126 } 2127 opts = NULL; 2128 } 2129 } 2130 last = in6p; 2131 } 2132 if (last) { 2133 if ((last->in6p_flags & INP_CONTROLOPTS) != 0 || 2134 (last->in6p_socket->so_options & SO_TIMESTAMP) != 0 || 2135 (last->in6p_socket->so_options & SO_TIMESTAMP_MONOTONIC) != 0) { 2136 ret = ip6_savecontrol(last, m, &opts); 2137 if (ret != 0) { 2138 goto error; 2139 } 2140 } 2141 /* strip intermediate headers */ 2142 m_adj(m, off); 2143 so_recv_data_stat(last->in6p_socket, m, 0); 2144 if (sbappendaddr(&last->in6p_socket->so_rcv, 2145 (struct sockaddr *)&rip6src, m, opts, NULL) != 0) { 2146 sorwakeup(last->in6p_socket); 2147 } 2148 } else { 2149 goto error; 2150 } 2151 lck_rw_done(ripcbinfo.mtx); 2152 return IPPROTO_DONE; 2153 2154error: 2155 lck_rw_done(ripcbinfo.mtx); 2156 m_freem(m); 2157 m_freem(opts); 2158 ip6stat.ip6s_delivered--; 2159 return IPPROTO_DONE; 2160} 2161 2162/* 2163 * Reflect the ip6 packet back to the source. 2164 * OFF points to the icmp6 header, counted from the top of the mbuf. 2165 */ 2166void 2167icmp6_reflect(m, off) 2168 struct mbuf *m; 2169 size_t off; 2170{ 2171 struct ip6_hdr *ip6; 2172 struct icmp6_hdr *icmp6; 2173 struct in6_ifaddr *ia; 2174 struct in6_addr t, src_storage, *src = 0; 2175 int plen; 2176 int type, code; 2177 struct ifnet *outif = NULL; 2178 struct sockaddr_in6 sa6_src, sa6_dst; 2179 struct nd_ifinfo *ndi; 2180 u_int32_t oflow; 2181 struct ip6_out_args ip6oa = 2182 { IFSCOPE_NONE, { 0 }, IP6OAF_SELECT_SRCIF | IP6OAF_BOUND_SRCADDR }; 2183 2184 if ((m->m_flags & M_PKTHDR) && m->m_pkthdr.rcvif != NULL) { 2185 ip6oa.ip6oa_boundif = m->m_pkthdr.rcvif->if_index; 2186 ip6oa.ip6oa_flags |= IP6OAF_BOUND_IF; 2187 } 2188 2189 /* too short to reflect */ 2190 if (off < sizeof(struct ip6_hdr)) { 2191 nd6log((LOG_DEBUG, 2192 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n", 2193 (u_int32_t)off, (u_int32_t)sizeof(struct ip6_hdr), 2194 __FILE__, __LINE__)); 2195 goto bad; 2196 } 2197 2198 /* 2199 * If there are extra headers between IPv6 and ICMPv6, strip 2200 * off that header first. 2201 */ 2202#if DIAGNOSTIC 2203 if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN) 2204 panic("assumption failed in icmp6_reflect"); 2205#endif 2206 if (off > sizeof(struct ip6_hdr)) { 2207 size_t l; 2208 struct ip6_hdr nip6; 2209 2210 l = off - sizeof(struct ip6_hdr); 2211 m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6); 2212 m_adj(m, l); 2213 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2214 if (m->m_len < l) { 2215 if ((m = m_pullup(m, l)) == NULL) 2216 return; 2217 } 2218 bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6)); 2219 } else /* off == sizeof(struct ip6_hdr) */ { 2220 size_t l; 2221 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2222 if (m->m_len < l) { 2223 if ((m = m_pullup(m, l)) == NULL) 2224 return; 2225 } 2226 } 2227 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr); 2228 ip6 = mtod(m, struct ip6_hdr *); 2229 ip6->ip6_nxt = IPPROTO_ICMPV6; 2230 icmp6 = (struct icmp6_hdr *)(ip6 + 1); 2231 type = icmp6->icmp6_type; /* keep type for statistics */ 2232 code = icmp6->icmp6_code; /* ditto. */ 2233 2234 t = ip6->ip6_dst; 2235 /* 2236 * ip6_input() drops a packet if its src is multicast. 2237 * So, the src is never multicast. 2238 */ 2239 ip6->ip6_dst = ip6->ip6_src; 2240 2241 /* 2242 * XXX: make sure to embed scope zone information, using 2243 * already embedded IDs or the received interface (if any). 2244 * Note that rcvif may be NULL. 2245 */ 2246 bzero(&sa6_src, sizeof(sa6_src)); 2247 sa6_src.sin6_family = AF_INET6; 2248 sa6_src.sin6_len = sizeof(sa6_src); 2249 sa6_src.sin6_addr = ip6->ip6_dst; 2250 in6_recoverscope(&sa6_src, &ip6->ip6_dst, m->m_pkthdr.rcvif); 2251 in6_embedscope(&ip6->ip6_dst, &sa6_src, NULL, NULL, NULL); 2252 bzero(&sa6_dst, sizeof(sa6_dst)); 2253 sa6_dst.sin6_family = AF_INET6; 2254 sa6_dst.sin6_len = sizeof(sa6_dst); 2255 sa6_dst.sin6_addr = t; 2256 in6_recoverscope(&sa6_dst, &t, m->m_pkthdr.rcvif); 2257 in6_embedscope(&t, &sa6_dst, NULL, NULL, NULL); 2258 2259 /* 2260 * If the incoming packet was addressed directly to us(i.e. unicast), 2261 * use dst as the src for the reply. 2262 * The IN6_IFF_NOTREADY case should be VERY rare, but is possible 2263 * (for example) when we encounter an error while forwarding procedure 2264 * destined to a duplicated address of ours. 2265 * Note that ip6_getdstifaddr() may fail if we are in an error handling 2266 * procedure of an outgoing packet of our own, in which case we need 2267 * to search in the ifaddr list. 2268 */ 2269 lck_rw_lock_shared(&in6_ifaddr_rwlock); 2270 for (ia = in6_ifaddrs; ia; ia = ia->ia_next) { 2271 IFA_LOCK(&ia->ia_ifa); 2272 if (IN6_ARE_ADDR_EQUAL(&t, &ia->ia_addr.sin6_addr) && 2273 (ia->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) { 2274 IFA_UNLOCK(&ia->ia_ifa); 2275 src = &t; 2276 break; 2277 } 2278 IFA_UNLOCK(&ia->ia_ifa); 2279 } 2280 lck_rw_done(&in6_ifaddr_rwlock); 2281 if (ia == NULL && IN6_IS_ADDR_LINKLOCAL(&t) && (m->m_flags & M_LOOP)) { 2282 /* 2283 * This is the case if the dst is our link-local address 2284 * and the sender is also ourselves. 2285 */ 2286 src = &t; 2287 } 2288 2289 if (src == NULL) { 2290 int e; 2291 struct sockaddr_in6 sin6; 2292 struct route_in6 ro; 2293 2294 /* 2295 * This case matches to multicasts, our anycast, or unicasts 2296 * that we do not own. Select a source address based on the 2297 * source address of the erroneous packet. 2298 */ 2299 bzero(&sin6, sizeof(sin6)); 2300 sin6.sin6_family = AF_INET6; 2301 sin6.sin6_len = sizeof(sin6); 2302 sin6.sin6_addr = ip6->ip6_dst; /* zone ID should be embedded */ 2303 2304 bzero(&ro, sizeof(ro)); 2305 /* 2306 * in6_selectsrc() might return outif with its reference held 2307 * even in the error case, so we always need to release it 2308 * if non-NULL. 2309 */ 2310 src = in6_selectsrc(&sin6, NULL, NULL, &ro, &outif, 2311 &src_storage, ip6oa.ip6oa_boundif, &e); 2312 if (ro.ro_rt) 2313 rtfree(ro.ro_rt); /* XXX: we could use this */ 2314 if (src == NULL) { 2315 nd6log((LOG_DEBUG, 2316 "icmp6_reflect: source can't be determined: " 2317 "dst=%s, error=%d\n", 2318 ip6_sprintf(&sa6_src.sin6_addr), e)); 2319 goto bad; 2320 } 2321 } 2322 oflow = ip6->ip6_flow; /* Save for later */ 2323 ip6->ip6_src = *src; 2324 ip6->ip6_flow = 0; 2325 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2326 ip6->ip6_vfc |= IPV6_VERSION; 2327 if (icmp6->icmp6_type == ICMP6_ECHO_REPLY && icmp6->icmp6_code == 0) { 2328 ip6->ip6_flow |= (oflow & htonl(0x0ff00000)); 2329 } 2330 ip6->ip6_nxt = IPPROTO_ICMPV6; 2331 lck_rw_lock_shared(nd_if_rwlock); 2332 if (outif != NULL && (ndi = ND_IFINFO(outif)) != NULL && 2333 ndi->initialized) { 2334 lck_mtx_lock(&ndi->lock); 2335 ip6->ip6_hlim = ndi->chlim; 2336 lck_mtx_unlock(&ndi->lock); 2337 } 2338 if (m->m_pkthdr.rcvif != NULL && 2339 (ndi = ND_IFINFO(m->m_pkthdr.rcvif)) != NULL && 2340 ndi->initialized) { 2341 /* XXX: This may not be the outgoing interface */ 2342 lck_mtx_lock(&ndi->lock); 2343 ip6->ip6_hlim = ndi->chlim; 2344 lck_mtx_unlock(&ndi->lock); 2345 } else { 2346 ip6->ip6_hlim = ip6_defhlim; 2347 } 2348 lck_rw_done(nd_if_rwlock); 2349 /* Use the same traffic class as in the request to match IPv4 */ 2350 icmp6->icmp6_cksum = 0; 2351 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6, 2352 sizeof(struct ip6_hdr), plen); 2353 2354 /* 2355 * XXX option handling 2356 */ 2357 2358 m->m_flags &= ~(M_BCAST|M_MCAST); 2359#if IPSEC 2360 /* Don't lookup socket */ 2361 if (ipsec_bypass == 0) 2362 (void)ipsec_setsocket(m, NULL); 2363#endif /*IPSEC*/ 2364 2365 if (outif != NULL) { 2366 ifnet_release(outif); 2367 outif = NULL; 2368 } 2369 m->m_pkthdr.rcvif = NULL; 2370 m->m_pkthdr.csum_data = 0; 2371 m->m_pkthdr.csum_flags = 0; 2372 ip6_output(m, NULL, NULL, IPV6_OUTARGS, NULL, &outif, &ip6oa); 2373 if (outif != NULL) { 2374 icmp6_ifoutstat_inc(outif, type, code); 2375 ifnet_release(outif); 2376 } 2377 return; 2378 2379bad: 2380 m_freem(m); 2381 if (outif != NULL) 2382 ifnet_release(outif); 2383 return; 2384} 2385 2386static const char * 2387icmp6_redirect_diag(src6, dst6, tgt6) 2388 struct in6_addr *src6; 2389 struct in6_addr *dst6; 2390 struct in6_addr *tgt6; 2391{ 2392 static char buf[1024]; 2393 snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)", 2394 ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6)); 2395 return buf; 2396} 2397 2398void 2399icmp6_redirect_input(m, off) 2400 struct mbuf *m; 2401 int off; 2402{ 2403 struct ifnet *ifp = m->m_pkthdr.rcvif; 2404 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 2405 struct nd_redirect *nd_rd; 2406 int icmp6len = ntohs(ip6->ip6_plen); 2407 char *lladdr = NULL; 2408 int lladdrlen = 0; 2409 u_char *redirhdr = NULL; 2410 int redirhdrlen = 0; 2411 struct rtentry *rt = NULL; 2412 int is_router; 2413 int is_onlink; 2414 struct in6_addr src6 = ip6->ip6_src; 2415 struct in6_addr redtgt6; 2416 struct in6_addr reddst6; 2417 union nd_opts ndopts; 2418 2419 if (!m || !ifp) 2420 return; 2421 2422 /* 2423 * If we are an advertising router on this interface, 2424 * don't update route by icmp6 redirect. 2425 */ 2426 if (ifp->if_eflags & IFEF_IPV6_ROUTER) 2427 goto freeit; 2428 if (!icmp6_rediraccept) 2429 goto freeit; 2430 2431#ifndef PULLDOWN_TEST 2432 IP6_EXTHDR_CHECK(m, off, icmp6len, return); 2433 nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off); 2434#else 2435 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len); 2436 if (nd_rd == NULL) { 2437 icmp6stat.icp6s_tooshort++; 2438 return; 2439 } 2440#endif 2441 redtgt6 = nd_rd->nd_rd_target; 2442 reddst6 = nd_rd->nd_rd_dst; 2443 2444 if (in6_setscope(&redtgt6, m->m_pkthdr.rcvif, NULL) || 2445 in6_setscope(&reddst6, m->m_pkthdr.rcvif, NULL)) { 2446 goto freeit; 2447 } 2448 2449 /* validation */ 2450 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) { 2451 nd6log((LOG_ERR, 2452 "ICMP6 redirect sent from %s rejected; " 2453 "must be from linklocal\n", ip6_sprintf(&src6))); 2454 goto bad; 2455 } 2456 if (ip6->ip6_hlim != 255) { 2457 nd6log((LOG_ERR, 2458 "ICMP6 redirect sent from %s rejected; " 2459 "hlim=%d (must be 255)\n", 2460 ip6_sprintf(&src6), ip6->ip6_hlim)); 2461 goto bad; 2462 } 2463 { 2464 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */ 2465 struct sockaddr_in6 sin6; 2466 struct in6_addr *gw6; 2467 2468 bzero(&sin6, sizeof(sin6)); 2469 sin6.sin6_family = AF_INET6; 2470 sin6.sin6_len = sizeof(struct sockaddr_in6); 2471 bcopy(&reddst6, &sin6.sin6_addr, sizeof(reddst6)); 2472 rt = rtalloc1_scoped((struct sockaddr *)&sin6, 0, 0, ifp->if_index); 2473 if (rt) { 2474 RT_LOCK(rt); 2475 if (rt->rt_gateway == NULL || 2476 rt->rt_gateway->sa_family != AF_INET6) { 2477 nd6log((LOG_ERR, 2478 "ICMP6 redirect rejected; no route " 2479 "with inet6 gateway found for redirect dst: %s\n", 2480 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2481 RT_UNLOCK(rt); 2482 rtfree(rt); 2483 goto bad; 2484 } 2485 2486 gw6 = &(((struct sockaddr_in6 *)(void *) 2487 rt->rt_gateway)->sin6_addr); 2488 if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) { 2489 nd6log((LOG_ERR, 2490 "ICMP6 redirect rejected; " 2491 "not equal to gw-for-src=%s (must be same): " 2492 "%s\n", 2493 ip6_sprintf(gw6), 2494 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2495 RT_UNLOCK(rt); 2496 rtfree(rt); 2497 goto bad; 2498 } 2499 } else { 2500 nd6log((LOG_ERR, 2501 "ICMP6 redirect rejected; " 2502 "no route found for redirect dst: %s\n", 2503 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2504 goto bad; 2505 } 2506 RT_UNLOCK(rt); 2507 rtfree(rt); 2508 rt = NULL; 2509 } 2510 if (IN6_IS_ADDR_MULTICAST(&reddst6)) { 2511 nd6log((LOG_ERR, 2512 "ICMP6 redirect rejected; " 2513 "redirect dst must be unicast: %s\n", 2514 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2515 goto bad; 2516 } 2517 2518 is_router = is_onlink = 0; 2519 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 2520 is_router = 1; /* router case */ 2521 if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0) 2522 is_onlink = 1; /* on-link destination case */ 2523 if (!is_router && !is_onlink) { 2524 nd6log((LOG_ERR, 2525 "ICMP6 redirect rejected; " 2526 "neither router case nor onlink case: %s\n", 2527 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2528 goto bad; 2529 } 2530 /* validation passed */ 2531 2532 icmp6len -= sizeof(*nd_rd); 2533 nd6_option_init(nd_rd + 1, icmp6len, &ndopts); 2534 if (nd6_options(&ndopts) < 0) { 2535 nd6log((LOG_INFO, "icmp6_redirect_input: " 2536 "invalid ND option, rejected: %s\n", 2537 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2538 /* nd6_options have incremented stats */ 2539 goto freeit; 2540 } 2541 2542 if (ndopts.nd_opts_tgt_lladdr) { 2543 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 2544 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 2545 } 2546 2547 if (ndopts.nd_opts_rh) { 2548 redirhdrlen = ndopts.nd_opts_rh->nd_opt_rh_len; 2549 redirhdr = (u_char *)(ndopts.nd_opts_rh + 1); /* xxx */ 2550 } 2551 2552 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 2553 nd6log((LOG_INFO, 2554 "icmp6_redirect_input: lladdrlen mismatch for %s " 2555 "(if %d, icmp6 packet %d): %s\n", 2556 ip6_sprintf(&redtgt6), ifp->if_addrlen, lladdrlen - 2, 2557 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2558 goto bad; 2559 } 2560 2561 /* RFC 2461 8.3 */ 2562 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT, 2563 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER); 2564 2565 if (!is_onlink) { /* better router case. perform rtredirect. */ 2566 /* perform rtredirect */ 2567 struct sockaddr_in6 sdst; 2568 struct sockaddr_in6 sgw; 2569 struct sockaddr_in6 ssrc; 2570 2571 bzero(&sdst, sizeof(sdst)); 2572 bzero(&sgw, sizeof(sgw)); 2573 bzero(&ssrc, sizeof(ssrc)); 2574 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6; 2575 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len = 2576 sizeof(struct sockaddr_in6); 2577 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr)); 2578 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2579 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr)); 2580 rtredirect(ifp, (struct sockaddr *)&sdst, 2581 (struct sockaddr *)&sgw, NULL, RTF_GATEWAY | RTF_HOST, 2582 (struct sockaddr *)&ssrc, NULL); 2583 } 2584 /* finally update cached route in each socket via pfctlinput */ 2585 { 2586 struct sockaddr_in6 sdst; 2587 2588 bzero(&sdst, sizeof(sdst)); 2589 sdst.sin6_family = AF_INET6; 2590 sdst.sin6_len = sizeof(struct sockaddr_in6); 2591 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2592 2593 /* 2594 * Radar 6843900 2595 * Release the IPv6 domain lock because we are going to take domain_proto_mtx 2596 * and could otherwise cause a deadlock with other threads taking these locks 2597 * in the reverse order -- e.g. frag6_slowtimo() from pfslowtimo() 2598 */ 2599 lck_mtx_unlock(inet6_domain_mutex); 2600 pfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst); 2601 lck_mtx_lock(inet6_domain_mutex); 2602#if IPSEC 2603 key_sa_routechange((struct sockaddr *)&sdst); 2604#endif 2605 } 2606 2607 freeit: 2608 m_freem(m); 2609 return; 2610 2611 bad: 2612 icmp6stat.icp6s_badredirect++; 2613 m_freem(m); 2614} 2615 2616void 2617icmp6_redirect_output(m0, rt) 2618 struct mbuf *m0; 2619 struct rtentry *rt; 2620{ 2621 struct ifnet *ifp; /* my outgoing interface */ 2622 struct in6_addr ifp_ll6; 2623 struct in6_addr *router_ll6; 2624 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */ 2625 struct mbuf *m = NULL; /* newly allocated one */ 2626 struct ip6_hdr *ip6; /* m as struct ip6_hdr */ 2627 struct nd_redirect *nd_rd; 2628 size_t maxlen; 2629 u_char *p; 2630 struct ifnet *outif = NULL; 2631 struct sockaddr_in6 src_sa; 2632 struct ip6_out_args ip6oa = 2633 { IFSCOPE_NONE, { 0 }, IP6OAF_SELECT_SRCIF | IP6OAF_BOUND_SRCADDR }; 2634 2635 icmp6_errcount(&icmp6stat.icp6s_outerrhist, ND_REDIRECT, 0); 2636 2637 if (rt != NULL) 2638 RT_LOCK(rt); 2639 2640 /* sanity check */ 2641 if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp)) 2642 goto fail; 2643 2644 /* 2645 * If we are not a router to begin with, or not an advertising 2646 * router on this interface, don't send icmp6 redirect. 2647 */ 2648 if (!ip6_forwarding || !(ifp->if_eflags & IFEF_IPV6_ROUTER)) 2649 goto fail; 2650 2651 /* 2652 * Address check: 2653 * the source address must identify a neighbor, and 2654 * the destination address must not be a multicast address 2655 * [RFC 2461, sec 8.2] 2656 */ 2657 sip6 = mtod(m0, struct ip6_hdr *); 2658 bzero(&src_sa, sizeof(src_sa)); 2659 src_sa.sin6_family = AF_INET6; 2660 src_sa.sin6_len = sizeof(src_sa); 2661 src_sa.sin6_addr = sip6->ip6_src; 2662 /* we don't currently use sin6_scope_id, but eventually use it */ 2663 src_sa.sin6_scope_id = in6_addr2scopeid(ifp, &sip6->ip6_src); 2664 RT_UNLOCK(rt); 2665 if (nd6_is_addr_neighbor(&src_sa, ifp, 0) == 0) { 2666 /* already unlocked */ 2667 rt = NULL; 2668 goto fail; 2669 } 2670 RT_LOCK(rt); 2671 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst)) 2672 goto fail; /* what should we do here? */ 2673 2674 /* rate limit */ 2675 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0)) 2676 goto fail; 2677 2678 /* 2679 * Since we are going to append up to 1280 bytes (= IPV6_MMTU), 2680 * we almost always ask for an mbuf cluster for simplicity. 2681 * (MHLEN < IPV6_MMTU is almost always true) 2682 */ 2683#if IPV6_MMTU >= MCLBYTES 2684# error assumption failed about IPV6_MMTU and MCLBYTES 2685#endif 2686 MGETHDR(m, M_DONTWAIT, MT_HEADER); /* MAC-OK */ 2687 if (m && IPV6_MMTU >= MHLEN) 2688 MCLGET(m, M_DONTWAIT); 2689 if (!m) 2690 goto fail; 2691 m->m_pkthdr.rcvif = NULL; 2692 m->m_len = 0; 2693 maxlen = M_TRAILINGSPACE(m); 2694 maxlen = min(IPV6_MMTU, maxlen); 2695 /* just for safety */ 2696 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) + 2697 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) { 2698 goto fail; 2699 } 2700 2701 { 2702 /* get ip6 linklocal address for ifp(my outgoing interface). */ 2703 struct in6_ifaddr *ia; 2704 if ((ia = in6ifa_ifpforlinklocal(ifp, 2705 IN6_IFF_NOTREADY| 2706 IN6_IFF_ANYCAST)) == NULL) 2707 goto fail; 2708 IFA_LOCK(&ia->ia_ifa); 2709 ifp_ll6 = ia->ia_addr.sin6_addr; 2710 IFA_UNLOCK(&ia->ia_ifa); 2711 IFA_REMREF(&ia->ia_ifa); 2712 } 2713 2714 /* get ip6 linklocal address for the router. */ 2715 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) { 2716 struct sockaddr_in6 *sin6; 2717 sin6 = (struct sockaddr_in6 *)(void *)rt->rt_gateway; 2718 router_ll6 = &sin6->sin6_addr; 2719 if (!IN6_IS_ADDR_LINKLOCAL(router_ll6)) 2720 router_ll6 = (struct in6_addr *)NULL; 2721 } else 2722 router_ll6 = (struct in6_addr *)NULL; 2723 2724 /* ip6 */ 2725 ip6 = mtod(m, struct ip6_hdr *); 2726 ip6->ip6_flow = 0; 2727 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2728 ip6->ip6_vfc |= IPV6_VERSION; 2729 /* ip6->ip6_plen will be set later */ 2730 ip6->ip6_nxt = IPPROTO_ICMPV6; 2731 ip6->ip6_hlim = 255; 2732 /* ip6->ip6_src must be linklocal addr for my outgoing if. */ 2733 bcopy(&ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr)); 2734 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr)); 2735 2736 /* ND Redirect */ 2737 nd_rd = (struct nd_redirect *)(ip6 + 1); 2738 nd_rd->nd_rd_type = ND_REDIRECT; 2739 nd_rd->nd_rd_code = 0; 2740 nd_rd->nd_rd_reserved = 0; 2741 if (rt->rt_flags & RTF_GATEWAY) { 2742 /* 2743 * nd_rd->nd_rd_target must be a link-local address in 2744 * better router cases. 2745 */ 2746 if (!router_ll6) 2747 goto fail; 2748 bcopy(router_ll6, &nd_rd->nd_rd_target, 2749 sizeof(nd_rd->nd_rd_target)); 2750 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2751 sizeof(nd_rd->nd_rd_dst)); 2752 } else { 2753 /* make sure redtgt == reddst */ 2754 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target, 2755 sizeof(nd_rd->nd_rd_target)); 2756 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2757 sizeof(nd_rd->nd_rd_dst)); 2758 } 2759 RT_UNLOCK(rt); 2760 rt = NULL; 2761 2762 p = (u_char *)(nd_rd + 1); 2763 2764 if (!router_ll6) 2765 goto nolladdropt; 2766 2767 { 2768 /* target lladdr option */ 2769 struct rtentry *rt_router = NULL; 2770 int len; 2771 struct sockaddr_dl *sdl; 2772 struct nd_opt_hdr *nd_opt; 2773 char *lladdr; 2774 2775 /* Callee returns a locked route upon success */ 2776 rt_router = nd6_lookup(router_ll6, 0, ifp, 0); 2777 if (!rt_router) 2778 goto nolladdropt; 2779 RT_LOCK_ASSERT_HELD(rt_router); 2780 len = sizeof(*nd_opt) + ifp->if_addrlen; 2781 len = (len + 7) & ~7; /* round by 8 */ 2782 /* safety check */ 2783 if (len + (p - (u_char *)ip6) > maxlen) { 2784 RT_REMREF_LOCKED(rt_router); 2785 RT_UNLOCK(rt_router); 2786 goto nolladdropt; 2787 } 2788 2789 if (!(rt_router->rt_flags & RTF_GATEWAY) && 2790 (rt_router->rt_flags & RTF_LLINFO) && 2791 (rt_router->rt_gateway->sa_family == AF_LINK) && 2792 (sdl = (struct sockaddr_dl *)(void *) 2793 rt_router->rt_gateway) && sdl->sdl_alen) { 2794 nd_opt = (struct nd_opt_hdr *)p; 2795 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 2796 nd_opt->nd_opt_len = len >> 3; 2797 lladdr = (char *)(nd_opt + 1); 2798 bcopy(LLADDR(sdl), lladdr, ifp->if_addrlen); 2799 p += len; 2800 } 2801 RT_REMREF_LOCKED(rt_router); 2802 RT_UNLOCK(rt_router); 2803 } 2804 2805nolladdropt:; 2806 2807 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2808 2809 /* just to be safe */ 2810#ifdef M_DECRYPTED /*not openbsd*/ 2811 if (m0->m_flags & M_DECRYPTED) 2812 goto noredhdropt; 2813#endif 2814 if (p - (u_char *)ip6 > maxlen) 2815 goto noredhdropt; 2816 2817 { 2818 /* redirected header option */ 2819 int len; 2820 struct nd_opt_rd_hdr *nd_opt_rh; 2821 2822 /* 2823 * compute the maximum size for icmp6 redirect header option. 2824 * XXX room for auth header? 2825 */ 2826 len = maxlen - (p - (u_char *)ip6); 2827 len &= ~7; 2828 2829 /* This is just for simplicity. */ 2830 if (m0->m_pkthdr.len != m0->m_len) { 2831 if (m0->m_next) { 2832 m_freem(m0->m_next); 2833 m0->m_next = NULL; 2834 } 2835 m0->m_pkthdr.len = m0->m_len; 2836 } 2837 2838 /* 2839 * Redirected header option spec (RFC2461 4.6.3) talks nothing 2840 * about padding/truncate rule for the original IP packet. 2841 * From the discussion on IPv6imp in Feb 1999, the consensus was: 2842 * - "attach as much as possible" is the goal 2843 * - pad if not aligned (original size can be guessed by original 2844 * ip6 header) 2845 * Following code adds the padding if it is simple enough, 2846 * and truncates if not. 2847 */ 2848 if (m0->m_next || m0->m_pkthdr.len != m0->m_len) 2849 panic("assumption failed in %s:%d\n", __FILE__, __LINE__); 2850 2851 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) { 2852 /* not enough room, truncate */ 2853 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh); 2854 } else { 2855 /* enough room, pad or truncate */ 2856 size_t extra; 2857 2858 extra = m0->m_pkthdr.len % 8; 2859 if (extra) { 2860 /* pad if easy enough, truncate if not */ 2861 if (8 - extra <= M_TRAILINGSPACE(m0)) { 2862 /* pad */ 2863 m0->m_len += (8 - extra); 2864 m0->m_pkthdr.len += (8 - extra); 2865 } else { 2866 /* truncate */ 2867 m0->m_pkthdr.len -= extra; 2868 m0->m_len -= extra; 2869 } 2870 } 2871 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh); 2872 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh); 2873 } 2874 2875 nd_opt_rh = (struct nd_opt_rd_hdr *)p; 2876 bzero(nd_opt_rh, sizeof(*nd_opt_rh)); 2877 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER; 2878 nd_opt_rh->nd_opt_rh_len = len >> 3; 2879 p += sizeof(*nd_opt_rh); 2880 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2881 2882 /* connect m0 to m */ 2883 m->m_next = m0; 2884 m->m_pkthdr.len = m->m_len + m0->m_len; 2885 } 2886noredhdropt:; 2887 2888 /* XXX: clear embedded link IDs in the inner header */ 2889 in6_clearscope(&sip6->ip6_src); 2890 in6_clearscope(&sip6->ip6_dst); 2891 in6_clearscope(&nd_rd->nd_rd_target); 2892 in6_clearscope(&nd_rd->nd_rd_dst); 2893 2894 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 2895 2896 nd_rd->nd_rd_cksum = 0; 2897 nd_rd->nd_rd_cksum 2898 = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen)); 2899 2900 /* send the packet to outside... */ 2901#if IPSEC 2902 /* Don't lookup socket */ 2903 if (ipsec_bypass == 0) 2904 (void)ipsec_setsocket(m, NULL); 2905#endif /*IPSEC*/ 2906 2907 ip6oa.ip6oa_boundif = ifp->if_index; 2908 ip6oa.ip6oa_flags |= IP6OAF_BOUND_IF; 2909 2910 ip6_output(m, NULL, NULL, IPV6_OUTARGS, NULL, &outif, &ip6oa); 2911 if (outif) { 2912 icmp6_ifstat_inc(outif, ifs6_out_msg); 2913 icmp6_ifstat_inc(outif, ifs6_out_redirect); 2914 ifnet_release(outif); 2915 } 2916 icmp6stat.icp6s_outhist[ND_REDIRECT]++; 2917 2918 return; 2919 2920fail: 2921 if (rt != NULL) 2922 RT_UNLOCK(rt); 2923 if (m) 2924 m_freem(m); 2925 if (m0) 2926 m_freem(m0); 2927} 2928 2929/* 2930 * ICMPv6 socket option processing. 2931 */ 2932int 2933icmp6_ctloutput(so, sopt) 2934 struct socket *so; 2935 struct sockopt *sopt; 2936{ 2937 int error = 0; 2938 int optlen; 2939 struct inpcb *inp = sotoinpcb(so); 2940 int level, op, optname; 2941 2942 if (sopt) { 2943 level = sopt->sopt_level; 2944 op = sopt->sopt_dir; 2945 optname = sopt->sopt_name; 2946 optlen = sopt->sopt_valsize; 2947 } else 2948 level = op = optname = optlen = 0; 2949 2950 if (level != IPPROTO_ICMPV6) { 2951 return EINVAL; 2952 } 2953 2954 switch (op) { 2955 case PRCO_SETOPT: 2956 switch (optname) { 2957 case ICMP6_FILTER: 2958 { 2959 struct icmp6_filter *p; 2960 2961 if (optlen != 0 && optlen != sizeof(*p)) { 2962 error = EMSGSIZE; 2963 break; 2964 } 2965 if (inp->in6p_icmp6filt == NULL) { 2966 error = EINVAL; 2967 break; 2968 } 2969 2970 if (optlen == 0) { 2971 /* According to RFC 3542, an installed filter can be 2972 * cleared by issuing a setsockopt for ICMP6_FILTER 2973 * with a zero length. 2974 */ 2975 ICMP6_FILTER_SETPASSALL(inp->in6p_icmp6filt); 2976 } else { 2977 error = sooptcopyin(sopt, inp->in6p_icmp6filt, optlen, 2978 optlen); 2979 } 2980 break; 2981 } 2982 2983 default: 2984 error = ENOPROTOOPT; 2985 break; 2986 } 2987 break; 2988 2989 case PRCO_GETOPT: 2990 switch (optname) { 2991 case ICMP6_FILTER: 2992 { 2993 if (inp->in6p_icmp6filt == NULL) { 2994 error = EINVAL; 2995 break; 2996 } 2997 error = sooptcopyout(sopt, inp->in6p_icmp6filt, 2998 min(sizeof(struct icmp6_filter), optlen)); 2999 break; 3000 } 3001 3002 default: 3003 error = ENOPROTOOPT; 3004 break; 3005 } 3006 break; 3007 } 3008 3009 return(error); 3010} 3011 3012/* 3013 * ICMPv6 socket datagram option processing. 3014 */ 3015int 3016icmp6_dgram_ctloutput(struct socket *so, struct sockopt *sopt) 3017{ 3018 if (kauth_cred_issuser(so->so_cred)) 3019 return icmp6_ctloutput(so, sopt); 3020 3021 if (sopt->sopt_level == IPPROTO_ICMPV6) { 3022 switch (sopt->sopt_name) { 3023 case ICMP6_FILTER: 3024 return icmp6_ctloutput(so, sopt); 3025 default: 3026 return EPERM; 3027 } 3028 } 3029 3030 if (sopt->sopt_level != IPPROTO_IPV6) 3031 return EINVAL; 3032 3033 switch (sopt->sopt_name) { 3034 case IPV6_UNICAST_HOPS: 3035 case IPV6_CHECKSUM: 3036 case IPV6_V6ONLY: 3037 case IPV6_USE_MIN_MTU: 3038 case IPV6_RECVRTHDR: 3039 case IPV6_RECVPKTINFO: 3040 case IPV6_RECVHOPLIMIT: 3041 case IPV6_PATHMTU: 3042 case IPV6_PKTINFO: 3043 case IPV6_HOPLIMIT: 3044 case IPV6_HOPOPTS: 3045 case IPV6_DSTOPTS: 3046 case IPV6_MULTICAST_IF: 3047 case IPV6_MULTICAST_HOPS: 3048 case IPV6_MULTICAST_LOOP: 3049 case IPV6_JOIN_GROUP: 3050 case IPV6_LEAVE_GROUP: 3051 case IPV6_PORTRANGE: 3052 case IPV6_IPSEC_POLICY: 3053 case IPV6_RECVTCLASS: 3054 case IPV6_TCLASS: 3055 case IPV6_2292PKTOPTIONS: 3056 case IPV6_2292PKTINFO: 3057 case IPV6_2292HOPLIMIT: 3058 case IPV6_2292HOPOPTS: 3059 case IPV6_2292DSTOPTS: 3060 case IPV6_2292RTHDR: 3061 case IPV6_BOUND_IF: 3062 case IPV6_NO_IFT_CELLULAR: 3063 3064 return ip6_ctloutput(so, sopt); 3065 3066 default: 3067 return EPERM; 3068 } 3069} 3070 3071__private_extern__ int 3072icmp6_dgram_send(struct socket *so, int flags, struct mbuf *m, 3073 struct sockaddr *nam, struct mbuf *control, struct proc *p) 3074{ 3075#pragma unused(flags, p) 3076 int error = 0; 3077 struct inpcb *inp = sotoinpcb(so); 3078 struct sockaddr_in6 tmp; 3079 struct sockaddr_in6 *dst = (struct sockaddr_in6 *)(void *)nam; 3080 struct icmp6_hdr *icmp6; 3081 3082 if (kauth_cred_issuser(so->so_cred)) 3083 return rip6_output(m, so, (struct sockaddr_in6 *)(void *)nam, 3084 control, 0); 3085 3086 /* always copy sockaddr to avoid overwrites */ 3087 if (so->so_state & SS_ISCONNECTED) { 3088 if (nam) { 3089 m_freem(m); 3090 return EISCONN; 3091 } 3092 /* XXX */ 3093 bzero(&tmp, sizeof(tmp)); 3094 tmp.sin6_family = AF_INET6; 3095 tmp.sin6_len = sizeof(struct sockaddr_in6); 3096 bcopy(&inp->in6p_faddr, &tmp.sin6_addr, 3097 sizeof(struct in6_addr)); 3098 dst = &tmp; 3099 } else { 3100 if (nam == NULL) { 3101 m_freem(m); 3102 return ENOTCONN; 3103 } 3104 tmp = *(struct sockaddr_in6 *)(void *)nam; 3105 dst = &tmp; 3106 } 3107 3108 /* 3109 * For an ICMPv6 packet, we should know its type and code 3110 */ 3111 if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) { 3112 if (m->m_len < sizeof(struct icmp6_hdr) && 3113 (m = m_pullup(m, sizeof(struct icmp6_hdr))) == NULL) { 3114 error = ENOBUFS; 3115 goto bad; 3116 } 3117 icmp6 = mtod(m, struct icmp6_hdr *); 3118 3119 /* 3120 * Allow only to send echo request and node information request 3121 * See RFC 2463 for Echo Request Message format 3122 */ 3123 if ((icmp6->icmp6_type == ICMP6_ECHO_REQUEST && icmp6->icmp6_code == 0) || 3124 (icmp6->icmp6_type == ICMP6_NI_QUERY && 3125 (icmp6->icmp6_code == ICMP6_NI_SUBJ_IPV6 || 3126 icmp6->icmp6_code == ICMP6_NI_SUBJ_FQDN))) { 3127 /* Good */ 3128 ; 3129 } else { 3130 error = EPERM; 3131 goto bad; 3132 } 3133 } 3134 3135#if ENABLE_DEFAULT_SCOPE 3136 if (dst->sin6_scope_id == 0) { /* not change if specified */ 3137 dst->sin6_scope_id = scope6_addr2default(&dst->sin6_addr); 3138 } 3139#endif 3140 3141 return rip6_output(m, so, (struct sockaddr_in6 *)(void *)nam, 3142 control, 0); 3143bad: 3144 m_freem(m); 3145 return error; 3146} 3147 3148/* Like rip6_attach but without root privilege enforcement */ 3149__private_extern__ int 3150icmp6_dgram_attach(struct socket *so, int proto, struct proc *p) 3151{ 3152 struct inpcb *inp; 3153 int error; 3154 3155 inp = sotoinpcb(so); 3156 if (inp) 3157 panic("icmp6_dgram_attach"); 3158 3159 if (proto != IPPROTO_ICMPV6) 3160 return EINVAL; 3161 3162 error = soreserve(so, rip_sendspace, rip_recvspace); 3163 if (error) 3164 return error; 3165 error = in_pcballoc(so, &ripcbinfo, p); 3166 if (error) 3167 return error; 3168 inp = (struct inpcb *)so->so_pcb; 3169 inp->inp_vflag |= INP_IPV6; 3170 inp->in6p_ip6_nxt = IPPROTO_ICMPV6; 3171 inp->in6p_hops = -1; /* use kernel default */ 3172 inp->in6p_cksum = -1; 3173 MALLOC(inp->in6p_icmp6filt, struct icmp6_filter *, 3174 sizeof(struct icmp6_filter), M_PCB, M_WAITOK); 3175 if (inp->in6p_icmp6filt == NULL) 3176 return (ENOMEM); 3177 ICMP6_FILTER_SETPASSALL(inp->in6p_icmp6filt); 3178 return 0; 3179} 3180 3181 3182 3183#ifndef HAVE_PPSRATECHECK 3184#ifndef timersub 3185#define timersub(tvp, uvp, vvp) \ 3186 do { \ 3187 (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec; \ 3188 (vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec; \ 3189 if ((vvp)->tv_usec < 0) { \ 3190 (vvp)->tv_sec--; \ 3191 (vvp)->tv_usec += 1000000; \ 3192 } \ 3193 } while (0) 3194#endif 3195 3196/* 3197 * ppsratecheck(): packets (or events) per second limitation. 3198 */ 3199static int 3200ppsratecheck(lasttime, curpps, maxpps) 3201 struct timeval *lasttime; 3202 int *curpps; 3203 int maxpps; /* maximum pps allowed */ 3204{ 3205 struct timeval tv, delta; 3206 int rv; 3207 3208 microtime(&tv); 3209 3210 timersub(&tv, lasttime, &delta); 3211 3212 /* 3213 * Check for 0,0 so that the message will be seen at least once. 3214 * If more than one second has passed since the last update of 3215 * lasttime, reset the counter. 3216 * 3217 * we do increment *curpps even in *curpps < maxpps case, as some may 3218 * try to use *curpps for stat purposes as well. 3219 */ 3220 if ((lasttime->tv_sec == 0 && lasttime->tv_usec == 0) || 3221 delta.tv_sec >= 1) { 3222 *lasttime = tv; 3223 *curpps = 0; 3224 rv = 1; 3225 } else if (maxpps < 0) 3226 rv = 1; 3227 else if (*curpps < maxpps) 3228 rv = 1; 3229 else 3230 rv = 0; 3231 3232#if 1 /* DIAGNOSTIC? */ 3233 /* be careful about wrap-around */ 3234 if (*curpps + 1 > 0) 3235 *curpps = *curpps + 1; 3236#else 3237 /* 3238 * assume that there's not too many calls to this function. 3239 * not sure if the assumption holds, as it depends on *caller's* 3240 * behavior, not the behavior of this function. 3241 * IMHO it is wrong to make assumption on the caller's behavior, 3242 * so the above #if is #if 1, not #ifdef DIAGNOSTIC. 3243 */ 3244 *curpps = *curpps + 1; 3245#endif 3246 3247 return (rv); 3248} 3249#endif 3250 3251/* 3252 * Perform rate limit check. 3253 * Returns 0 if it is okay to send the icmp6 packet. 3254 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate 3255 * limitation. 3256 * 3257 * XXX per-destination/type check necessary? 3258 */ 3259static int 3260icmp6_ratelimit( 3261 __unused const struct in6_addr *dst, /* not used at this moment */ 3262 __unused const int type, /* not used at this moment */ 3263 __unused const int code) /* not used at this moment */ 3264{ 3265 int ret; 3266 3267 ret = 0; /* okay to send */ 3268 3269 /* PPS limit */ 3270 if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count, 3271 icmp6errppslim)) { 3272 /* The packet is subject to rate limit */ 3273 ret++; 3274 } 3275 3276 return ret; 3277} 3278