icmp6.c revision 120727
1/* $FreeBSD: head/sys/netinet6/icmp6.c 120727 2003-10-04 03:44:50Z sam $ */ 2/* $KAME: icmp6.c,v 1.211 2001/04/04 05:56:20 itojun Exp $ */ 3 4/* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33/* 34 * Copyright (c) 1982, 1986, 1988, 1993 35 * The Regents of the University of California. All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. All advertising materials mentioning features or use of this software 46 * must display the following acknowledgement: 47 * This product includes software developed by the University of 48 * California, Berkeley and its contributors. 49 * 4. Neither the name of the University nor the names of its contributors 50 * may be used to endorse or promote products derived from this software 51 * without specific prior written permission. 52 * 53 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 54 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 55 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 56 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 57 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 58 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 59 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 61 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 62 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 63 * SUCH DAMAGE. 64 * 65 * @(#)ip_icmp.c 8.2 (Berkeley) 1/4/94 66 */ 67 68#include "opt_inet.h" 69#include "opt_inet6.h" 70#include "opt_ipsec.h" 71 72#include <sys/param.h> 73#include <sys/domain.h> 74#include <sys/kernel.h> 75#include <sys/lock.h> 76#include <sys/malloc.h> 77#include <sys/mbuf.h> 78#include <sys/protosw.h> 79#include <sys/signalvar.h> 80#include <sys/socket.h> 81#include <sys/socketvar.h> 82#include <sys/sx.h> 83#include <sys/syslog.h> 84#include <sys/systm.h> 85#include <sys/time.h> 86 87#include <net/if.h> 88#include <net/if_dl.h> 89#include <net/if_types.h> 90#include <net/route.h> 91 92#include <netinet/in.h> 93#include <netinet/in_pcb.h> 94#include <netinet/in_var.h> 95#include <netinet/ip6.h> 96#include <netinet/icmp6.h> 97#include <netinet6/in6_ifattach.h> 98#include <netinet6/in6_pcb.h> 99#include <netinet6/ip6protosw.h> 100#include <netinet6/ip6_var.h> 101#include <netinet6/mld6_var.h> 102#include <netinet6/nd6.h> 103 104#ifdef IPSEC 105#include <netinet6/ipsec.h> 106#include <netkey/key.h> 107#endif 108 109#ifdef FAST_IPSEC 110#include <netipsec/ipsec.h> 111#include <netipsec/key.h> 112#define IPSEC 113#endif 114 115#include <net/net_osdep.h> 116 117#ifdef HAVE_NRL_INPCB 118/* inpcb members */ 119#define in6pcb inpcb 120#define in6p_laddr inp_laddr6 121#define in6p_faddr inp_faddr6 122#define in6p_icmp6filt inp_icmp6filt 123#define in6p_route inp_route 124#define in6p_socket inp_socket 125#define in6p_flags inp_flags 126#define in6p_moptions inp_moptions6 127#define in6p_outputopts inp_outputopts6 128#define in6p_ip6 inp_ipv6 129#define in6p_flowinfo inp_flowinfo 130#define in6p_sp inp_sp 131#define in6p_next inp_next 132#define in6p_prev inp_prev 133/* macro names */ 134#define sotoin6pcb sotoinpcb 135/* function names */ 136#define in6_pcbdetach in_pcbdetach 137#define in6_rtchange in_rtchange 138 139/* 140 * for KAME src sync over BSD*'s. XXX: FreeBSD (>=3) are VERY different from 141 * others... 142 */ 143#define in6p_ip6_nxt inp_ipv6.ip6_nxt 144#endif 145 146extern struct domain inet6domain; 147 148struct icmp6stat icmp6stat; 149 150extern struct inpcbhead ripcb; 151extern int icmp6errppslim; 152static int icmp6errpps_count = 0; 153static struct timeval icmp6errppslim_last; 154extern int icmp6_nodeinfo; 155 156static void icmp6_errcount __P((struct icmp6errstat *, int, int)); 157static int icmp6_rip6_input __P((struct mbuf **, int)); 158static int icmp6_ratelimit __P((const struct in6_addr *, const int, const int)); 159static const char *icmp6_redirect_diag __P((struct in6_addr *, 160 struct in6_addr *, struct in6_addr *)); 161#define HAVE_PPSRATECHECK 162#ifndef HAVE_PPSRATECHECK 163static int ppsratecheck __P((struct timeval *, int *, int)); 164#endif 165static struct mbuf *ni6_input __P((struct mbuf *, int)); 166static struct mbuf *ni6_nametodns __P((const char *, int, int)); 167static int ni6_dnsmatch __P((const char *, int, const char *, int)); 168static int ni6_addrs __P((struct icmp6_nodeinfo *, struct mbuf *, 169 struct ifnet **, char *)); 170static int ni6_store_addrs __P((struct icmp6_nodeinfo *, struct icmp6_nodeinfo *, 171 struct ifnet *, int)); 172static int icmp6_notify_error __P((struct mbuf *, int, int, int)); 173 174#ifdef COMPAT_RFC1885 175static struct route_in6 icmp6_reflect_rt; 176#endif 177 178 179void 180icmp6_init() 181{ 182 mld6_init(); 183} 184 185static void 186icmp6_errcount(stat, type, code) 187 struct icmp6errstat *stat; 188 int type, code; 189{ 190 switch (type) { 191 case ICMP6_DST_UNREACH: 192 switch (code) { 193 case ICMP6_DST_UNREACH_NOROUTE: 194 stat->icp6errs_dst_unreach_noroute++; 195 return; 196 case ICMP6_DST_UNREACH_ADMIN: 197 stat->icp6errs_dst_unreach_admin++; 198 return; 199 case ICMP6_DST_UNREACH_BEYONDSCOPE: 200 stat->icp6errs_dst_unreach_beyondscope++; 201 return; 202 case ICMP6_DST_UNREACH_ADDR: 203 stat->icp6errs_dst_unreach_addr++; 204 return; 205 case ICMP6_DST_UNREACH_NOPORT: 206 stat->icp6errs_dst_unreach_noport++; 207 return; 208 } 209 break; 210 case ICMP6_PACKET_TOO_BIG: 211 stat->icp6errs_packet_too_big++; 212 return; 213 case ICMP6_TIME_EXCEEDED: 214 switch (code) { 215 case ICMP6_TIME_EXCEED_TRANSIT: 216 stat->icp6errs_time_exceed_transit++; 217 return; 218 case ICMP6_TIME_EXCEED_REASSEMBLY: 219 stat->icp6errs_time_exceed_reassembly++; 220 return; 221 } 222 break; 223 case ICMP6_PARAM_PROB: 224 switch (code) { 225 case ICMP6_PARAMPROB_HEADER: 226 stat->icp6errs_paramprob_header++; 227 return; 228 case ICMP6_PARAMPROB_NEXTHEADER: 229 stat->icp6errs_paramprob_nextheader++; 230 return; 231 case ICMP6_PARAMPROB_OPTION: 232 stat->icp6errs_paramprob_option++; 233 return; 234 } 235 break; 236 case ND_REDIRECT: 237 stat->icp6errs_redirect++; 238 return; 239 } 240 stat->icp6errs_unknown++; 241} 242 243/* 244 * Generate an error packet of type error in response to bad IP6 packet. 245 */ 246void 247icmp6_error(m, type, code, param) 248 struct mbuf *m; 249 int type, code, param; 250{ 251 struct ip6_hdr *oip6, *nip6; 252 struct icmp6_hdr *icmp6; 253 u_int preplen; 254 int off; 255 int nxt; 256 257 icmp6stat.icp6s_error++; 258 259 /* count per-type-code statistics */ 260 icmp6_errcount(&icmp6stat.icp6s_outerrhist, type, code); 261 262#ifdef M_DECRYPTED /*not openbsd*/ 263 if (m->m_flags & M_DECRYPTED) { 264 icmp6stat.icp6s_canterror++; 265 goto freeit; 266 } 267#endif 268 269#ifndef PULLDOWN_TEST 270 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), ); 271#else 272 if (m->m_len < sizeof(struct ip6_hdr)) { 273 m = m_pullup(m, sizeof(struct ip6_hdr)); 274 if (m == NULL) 275 return; 276 } 277#endif 278 oip6 = mtod(m, struct ip6_hdr *); 279 280 /* 281 * Multicast destination check. For unrecognized option errors, 282 * this check has already done in ip6_unknown_opt(), so we can 283 * check only for other errors. 284 */ 285 if ((m->m_flags & (M_BCAST|M_MCAST) || 286 IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) && 287 (type != ICMP6_PACKET_TOO_BIG && 288 (type != ICMP6_PARAM_PROB || 289 code != ICMP6_PARAMPROB_OPTION))) 290 goto freeit; 291 292 /* Source address check. XXX: the case of anycast source? */ 293 if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) || 294 IN6_IS_ADDR_MULTICAST(&oip6->ip6_src)) 295 goto freeit; 296 297 /* 298 * If we are about to send ICMPv6 against ICMPv6 error/redirect, 299 * don't do it. 300 */ 301 nxt = -1; 302 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 303 if (off >= 0 && nxt == IPPROTO_ICMPV6) { 304 struct icmp6_hdr *icp; 305 306#ifndef PULLDOWN_TEST 307 IP6_EXTHDR_CHECK(m, 0, off + sizeof(struct icmp6_hdr), ); 308 icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 309#else 310 IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off, 311 sizeof(*icp)); 312 if (icp == NULL) { 313 icmp6stat.icp6s_tooshort++; 314 return; 315 } 316#endif 317 if (icp->icmp6_type < ICMP6_ECHO_REQUEST || 318 icp->icmp6_type == ND_REDIRECT) { 319 /* 320 * ICMPv6 error 321 * Special case: for redirect (which is 322 * informational) we must not send icmp6 error. 323 */ 324 icmp6stat.icp6s_canterror++; 325 goto freeit; 326 } else { 327 /* ICMPv6 informational - send the error */ 328 } 329 } else { 330 /* non-ICMPv6 - send the error */ 331 } 332 333 oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */ 334 335 /* Finally, do rate limitation check. */ 336 if (icmp6_ratelimit(&oip6->ip6_src, type, code)) { 337 icmp6stat.icp6s_toofreq++; 338 goto freeit; 339 } 340 341 /* 342 * OK, ICMP6 can be generated. 343 */ 344 345 if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN) 346 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len); 347 348 preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 349 M_PREPEND(m, preplen, M_DONTWAIT); 350 if (m && m->m_len < preplen) 351 m = m_pullup(m, preplen); 352 if (m == NULL) { 353 nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__)); 354 return; 355 } 356 357 nip6 = mtod(m, struct ip6_hdr *); 358 nip6->ip6_src = oip6->ip6_src; 359 nip6->ip6_dst = oip6->ip6_dst; 360 361 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_src)) 362 oip6->ip6_src.s6_addr16[1] = 0; 363 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_dst)) 364 oip6->ip6_dst.s6_addr16[1] = 0; 365 366 icmp6 = (struct icmp6_hdr *)(nip6 + 1); 367 icmp6->icmp6_type = type; 368 icmp6->icmp6_code = code; 369 icmp6->icmp6_pptr = htonl((u_int32_t)param); 370 371 /* 372 * icmp6_reflect() is designed to be in the input path. 373 * icmp6_error() can be called from both input and outut path, 374 * and if we are in output path rcvif could contain bogus value. 375 * clear m->m_pkthdr.rcvif for safety, we should have enough scope 376 * information in ip header (nip6). 377 */ 378 m->m_pkthdr.rcvif = NULL; 379 380 icmp6stat.icp6s_outhist[type]++; 381 icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */ 382 383 return; 384 385 freeit: 386 /* 387 * If we can't tell wheter or not we can generate ICMP6, free it. 388 */ 389 m_freem(m); 390} 391 392/* 393 * Process a received ICMP6 message. 394 */ 395int 396icmp6_input(mp, offp, proto) 397 struct mbuf **mp; 398 int *offp, proto; 399{ 400 struct mbuf *m = *mp, *n; 401 struct ip6_hdr *ip6, *nip6; 402 struct icmp6_hdr *icmp6, *nicmp6; 403 int off = *offp; 404 int icmp6len = m->m_pkthdr.len - *offp; 405 int code, sum, noff; 406 407#ifndef PULLDOWN_TEST 408 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr), IPPROTO_DONE); 409 /* m might change if M_LOOP. So, call mtod after this */ 410#endif 411 412 /* 413 * Locate icmp6 structure in mbuf, and check 414 * that not corrupted and of at least minimum length 415 */ 416 417 ip6 = mtod(m, struct ip6_hdr *); 418 if (icmp6len < sizeof(struct icmp6_hdr)) { 419 icmp6stat.icp6s_tooshort++; 420 goto freeit; 421 } 422 423 /* 424 * calculate the checksum 425 */ 426#ifndef PULLDOWN_TEST 427 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off); 428#else 429 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 430 if (icmp6 == NULL) { 431 icmp6stat.icp6s_tooshort++; 432 return IPPROTO_DONE; 433 } 434#endif 435 code = icmp6->icmp6_code; 436 437 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) { 438 nd6log((LOG_ERR, 439 "ICMP6 checksum error(%d|%x) %s\n", 440 icmp6->icmp6_type, sum, ip6_sprintf(&ip6->ip6_src))); 441 icmp6stat.icp6s_checksum++; 442 goto freeit; 443 } 444 445 if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) { 446 /* 447 * Deliver very specific ICMP6 type only. 448 * This is important to deilver TOOBIG. Otherwise PMTUD 449 * will not work. 450 */ 451 switch (icmp6->icmp6_type) { 452 case ICMP6_DST_UNREACH: 453 case ICMP6_PACKET_TOO_BIG: 454 case ICMP6_TIME_EXCEEDED: 455 break; 456 default: 457 goto freeit; 458 } 459 } 460 461 icmp6stat.icp6s_inhist[icmp6->icmp6_type]++; 462 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_msg); 463 if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK) 464 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error); 465 466 switch (icmp6->icmp6_type) { 467 case ICMP6_DST_UNREACH: 468 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_dstunreach); 469 switch (code) { 470 case ICMP6_DST_UNREACH_NOROUTE: 471 code = PRC_UNREACH_NET; 472 break; 473 case ICMP6_DST_UNREACH_ADMIN: 474 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_adminprohib); 475 code = PRC_UNREACH_PROTOCOL; /* is this a good code? */ 476 break; 477 case ICMP6_DST_UNREACH_ADDR: 478 code = PRC_HOSTDEAD; 479 break; 480#ifdef COMPAT_RFC1885 481 case ICMP6_DST_UNREACH_NOTNEIGHBOR: 482 code = PRC_UNREACH_SRCFAIL; 483 break; 484#else 485 case ICMP6_DST_UNREACH_BEYONDSCOPE: 486 /* I mean "source address was incorrect." */ 487 code = PRC_PARAMPROB; 488 break; 489#endif 490 case ICMP6_DST_UNREACH_NOPORT: 491 code = PRC_UNREACH_PORT; 492 break; 493 default: 494 goto badcode; 495 } 496 goto deliver; 497 break; 498 499 case ICMP6_PACKET_TOO_BIG: 500 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_pkttoobig); 501 if (code != 0) 502 goto badcode; 503 504 code = PRC_MSGSIZE; 505 506 /* 507 * Updating the path MTU will be done after examining 508 * intermediate extension headers. 509 */ 510 goto deliver; 511 break; 512 513 case ICMP6_TIME_EXCEEDED: 514 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_timeexceed); 515 switch (code) { 516 case ICMP6_TIME_EXCEED_TRANSIT: 517 case ICMP6_TIME_EXCEED_REASSEMBLY: 518 code += PRC_TIMXCEED_INTRANS; 519 break; 520 default: 521 goto badcode; 522 } 523 goto deliver; 524 break; 525 526 case ICMP6_PARAM_PROB: 527 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_paramprob); 528 switch (code) { 529 case ICMP6_PARAMPROB_NEXTHEADER: 530 code = PRC_UNREACH_PROTOCOL; 531 break; 532 case ICMP6_PARAMPROB_HEADER: 533 case ICMP6_PARAMPROB_OPTION: 534 code = PRC_PARAMPROB; 535 break; 536 default: 537 goto badcode; 538 } 539 goto deliver; 540 break; 541 542 case ICMP6_ECHO_REQUEST: 543 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echo); 544 if (code != 0) 545 goto badcode; 546 if ((n = m_copy(m, 0, M_COPYALL)) == NULL) { 547 /* Give up remote */ 548 break; 549 } 550 if ((n->m_flags & M_EXT) != 0 551 || n->m_len < off + sizeof(struct icmp6_hdr)) { 552 struct mbuf *n0 = n; 553 const int maxlen = sizeof(*nip6) + sizeof(*nicmp6); 554 int n0len; 555 556 /* 557 * Prepare an internal mbuf. m_pullup() doesn't 558 * always copy the length we specified. 559 */ 560 if (maxlen >= MCLBYTES) { 561 /* Give up remote */ 562 m_freem(n0); 563 break; 564 } 565 MGETHDR(n, M_DONTWAIT, n0->m_type); 566 n0len = n0->m_pkthdr.len; /* save for use below */ 567 if (n) 568 M_MOVE_PKTHDR(n, n0); 569 if (n && maxlen >= MHLEN) { 570 MCLGET(n, M_DONTWAIT); 571 if ((n->m_flags & M_EXT) == 0) { 572 m_free(n); 573 n = NULL; 574 } 575 } 576 if (n == NULL) { 577 /* Give up remote */ 578 m_freem(n0); 579 break; 580 } 581 /* 582 * Copy IPv6 and ICMPv6 only. 583 */ 584 nip6 = mtod(n, struct ip6_hdr *); 585 bcopy(ip6, nip6, sizeof(struct ip6_hdr)); 586 nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 587 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); 588 noff = sizeof(struct ip6_hdr); 589 /* new mbuf contains only ipv6+icmpv6 headers */ 590 n->m_len = noff + sizeof(struct icmp6_hdr); 591 /* 592 * Adjust mbuf. ip6_plen will be adjusted in 593 * ip6_output(). 594 */ 595 m_adj(n0, off + sizeof(struct icmp6_hdr)); 596 /* recalculate complete packet size */ 597 n->m_pkthdr.len = n0len + (noff - off); 598 n->m_next = n0; 599 } else { 600 nip6 = mtod(n, struct ip6_hdr *); 601 nicmp6 = (struct icmp6_hdr *)((caddr_t)nip6 + off); 602 noff = off; 603 } 604 nicmp6->icmp6_type = ICMP6_ECHO_REPLY; 605 nicmp6->icmp6_code = 0; 606 if (n) { 607 icmp6stat.icp6s_reflect++; 608 icmp6stat.icp6s_outhist[ICMP6_ECHO_REPLY]++; 609 icmp6_reflect(n, noff); 610 } 611 break; 612 613 case ICMP6_ECHO_REPLY: 614 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echoreply); 615 if (code != 0) 616 goto badcode; 617 break; 618 619 case MLD_LISTENER_QUERY: 620 case MLD_LISTENER_REPORT: 621 if (icmp6len < sizeof(struct mld_hdr)) 622 goto badlen; 623 if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */ 624 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldquery); 625 else 626 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldreport); 627 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 628 /* give up local */ 629 mld6_input(m, off); 630 m = NULL; 631 goto freeit; 632 } 633 mld6_input(n, off); 634 /* m stays. */ 635 break; 636 637 case MLD_LISTENER_DONE: 638 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mlddone); 639 if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */ 640 goto badlen; 641 break; /* nothing to be done in kernel */ 642 643 case MLD_MTRACE_RESP: 644 case MLD_MTRACE: 645 /* XXX: these two are experimental. not officially defind. */ 646 /* XXX: per-interface statistics? */ 647 break; /* just pass it to applications */ 648 649 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */ 650 { 651 enum { WRU, FQDN } mode; 652 653 if (!icmp6_nodeinfo) 654 break; 655 656 if (icmp6len == sizeof(struct icmp6_hdr) + 4) 657 mode = WRU; 658 else if (icmp6len >= sizeof(struct icmp6_nodeinfo)) 659 mode = FQDN; 660 else 661 goto badlen; 662 663#define hostnamelen strlen(hostname) 664 if (mode == FQDN) { 665#ifndef PULLDOWN_TEST 666 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo), 667 IPPROTO_DONE); 668#endif 669 n = m_copy(m, 0, M_COPYALL); 670 if (n) 671 n = ni6_input(n, off); 672 /* XXX meaningless if n == NULL */ 673 noff = sizeof(struct ip6_hdr); 674 } else { 675 u_char *p; 676 int maxlen, maxhlen; 677 678 if ((icmp6_nodeinfo & 5) != 5) 679 break; 680 681 if (code != 0) 682 goto badcode; 683 maxlen = sizeof(*nip6) + sizeof(*nicmp6) + 4; 684 if (maxlen >= MCLBYTES) { 685 /* Give up remote */ 686 break; 687 } 688 MGETHDR(n, M_DONTWAIT, m->m_type); 689 if (n && maxlen > MHLEN) { 690 MCLGET(n, M_DONTWAIT); 691 if ((n->m_flags & M_EXT) == 0) { 692 m_free(n); 693 n = NULL; 694 } 695 } 696 if (!m_dup_pkthdr(n, m, M_DONTWAIT)) { 697 /* 698 * Previous code did a blind M_COPY_PKTHDR 699 * and said "just for rcvif". If true, then 700 * we could tolerate the dup failing (due to 701 * the deep copy of the tag chain). For now 702 * be conservative and just fail. 703 */ 704 m_free(n); 705 n = NULL; 706 } 707 if (n == NULL) { 708 /* Give up remote */ 709 break; 710 } 711 n->m_pkthdr.rcvif = NULL; 712 n->m_len = 0; 713 maxhlen = M_TRAILINGSPACE(n) - maxlen; 714 if (maxhlen > hostnamelen) 715 maxhlen = hostnamelen; 716 /* 717 * Copy IPv6 and ICMPv6 only. 718 */ 719 nip6 = mtod(n, struct ip6_hdr *); 720 bcopy(ip6, nip6, sizeof(struct ip6_hdr)); 721 nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 722 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); 723 p = (u_char *)(nicmp6 + 1); 724 bzero(p, 4); 725 bcopy(hostname, p + 4, maxhlen); /* meaningless TTL */ 726 noff = sizeof(struct ip6_hdr); 727 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 728 sizeof(struct icmp6_hdr) + 4 + maxhlen; 729 nicmp6->icmp6_type = ICMP6_WRUREPLY; 730 nicmp6->icmp6_code = 0; 731 } 732#undef hostnamelen 733 if (n) { 734 icmp6stat.icp6s_reflect++; 735 icmp6stat.icp6s_outhist[ICMP6_WRUREPLY]++; 736 icmp6_reflect(n, noff); 737 } 738 break; 739 } 740 741 case ICMP6_WRUREPLY: 742 if (code != 0) 743 goto badcode; 744 break; 745 746 case ND_ROUTER_SOLICIT: 747 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routersolicit); 748 if (code != 0) 749 goto badcode; 750 if (icmp6len < sizeof(struct nd_router_solicit)) 751 goto badlen; 752 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 753 /* give up local */ 754 nd6_rs_input(m, off, icmp6len); 755 m = NULL; 756 goto freeit; 757 } 758 nd6_rs_input(n, off, icmp6len); 759 /* m stays. */ 760 break; 761 762 case ND_ROUTER_ADVERT: 763 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routeradvert); 764 if (code != 0) 765 goto badcode; 766 if (icmp6len < sizeof(struct nd_router_advert)) 767 goto badlen; 768 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 769 /* give up local */ 770 nd6_ra_input(m, off, icmp6len); 771 m = NULL; 772 goto freeit; 773 } 774 nd6_ra_input(n, off, icmp6len); 775 /* m stays. */ 776 break; 777 778 case ND_NEIGHBOR_SOLICIT: 779 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighborsolicit); 780 if (code != 0) 781 goto badcode; 782 if (icmp6len < sizeof(struct nd_neighbor_solicit)) 783 goto badlen; 784 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 785 /* give up local */ 786 nd6_ns_input(m, off, icmp6len); 787 m = NULL; 788 goto freeit; 789 } 790 nd6_ns_input(n, off, icmp6len); 791 /* m stays. */ 792 break; 793 794 case ND_NEIGHBOR_ADVERT: 795 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighboradvert); 796 if (code != 0) 797 goto badcode; 798 if (icmp6len < sizeof(struct nd_neighbor_advert)) 799 goto badlen; 800 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 801 /* give up local */ 802 nd6_na_input(m, off, icmp6len); 803 m = NULL; 804 goto freeit; 805 } 806 nd6_na_input(n, off, icmp6len); 807 /* m stays. */ 808 break; 809 810 case ND_REDIRECT: 811 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_redirect); 812 if (code != 0) 813 goto badcode; 814 if (icmp6len < sizeof(struct nd_redirect)) 815 goto badlen; 816 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 817 /* give up local */ 818 icmp6_redirect_input(m, off); 819 m = NULL; 820 goto freeit; 821 } 822 icmp6_redirect_input(n, off); 823 /* m stays. */ 824 break; 825 826 case ICMP6_ROUTER_RENUMBERING: 827 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND && 828 code != ICMP6_ROUTER_RENUMBERING_RESULT) 829 goto badcode; 830 if (icmp6len < sizeof(struct icmp6_router_renum)) 831 goto badlen; 832 break; 833 834 default: 835 nd6log((LOG_DEBUG, 836 "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n", 837 icmp6->icmp6_type, ip6_sprintf(&ip6->ip6_src), 838 ip6_sprintf(&ip6->ip6_dst), 839 m->m_pkthdr.rcvif ? m->m_pkthdr.rcvif->if_index : 0)); 840 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) { 841 /* ICMPv6 error: MUST deliver it by spec... */ 842 code = PRC_NCMDS; 843 /* deliver */ 844 } else { 845 /* ICMPv6 informational: MUST not deliver */ 846 break; 847 } 848 deliver: 849 if (icmp6_notify_error(m, off, icmp6len, code)) { 850 /* In this case, m should've been freed. */ 851 return(IPPROTO_DONE); 852 } 853 break; 854 855 badcode: 856 icmp6stat.icp6s_badcode++; 857 break; 858 859 badlen: 860 icmp6stat.icp6s_badlen++; 861 break; 862 } 863 864 /* deliver the packet to appropriate sockets */ 865 icmp6_rip6_input(&m, *offp); 866 867 return IPPROTO_DONE; 868 869 freeit: 870 m_freem(m); 871 return IPPROTO_DONE; 872} 873 874static int 875icmp6_notify_error(m, off, icmp6len, code) 876 struct mbuf *m; 877 int off, icmp6len, code; 878{ 879 struct icmp6_hdr *icmp6; 880 struct ip6_hdr *eip6; 881 u_int32_t notifymtu; 882 struct sockaddr_in6 icmp6src, icmp6dst; 883 884 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) { 885 icmp6stat.icp6s_tooshort++; 886 goto freeit; 887 } 888#ifndef PULLDOWN_TEST 889 IP6_EXTHDR_CHECK(m, off, 890 sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr), 891 -1); 892 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 893#else 894 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 895 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 896 if (icmp6 == NULL) { 897 icmp6stat.icp6s_tooshort++; 898 return(-1); 899 } 900#endif 901 eip6 = (struct ip6_hdr *)(icmp6 + 1); 902 903 /* Detect the upper level protocol */ 904 { 905 void (*ctlfunc) __P((int, struct sockaddr *, void *)); 906 u_int8_t nxt = eip6->ip6_nxt; 907 int eoff = off + sizeof(struct icmp6_hdr) + 908 sizeof(struct ip6_hdr); 909 struct ip6ctlparam ip6cp; 910 struct in6_addr *finaldst = NULL; 911 int icmp6type = icmp6->icmp6_type; 912 struct ip6_frag *fh; 913 struct ip6_rthdr *rth; 914 struct ip6_rthdr0 *rth0; 915 int rthlen; 916 917 while (1) { /* XXX: should avoid infinite loop explicitly? */ 918 struct ip6_ext *eh; 919 920 switch (nxt) { 921 case IPPROTO_HOPOPTS: 922 case IPPROTO_DSTOPTS: 923 case IPPROTO_AH: 924#ifndef PULLDOWN_TEST 925 IP6_EXTHDR_CHECK(m, 0, eoff + 926 sizeof(struct ip6_ext), 927 -1); 928 eh = (struct ip6_ext *)(mtod(m, caddr_t) 929 + eoff); 930#else 931 IP6_EXTHDR_GET(eh, struct ip6_ext *, m, 932 eoff, sizeof(*eh)); 933 if (eh == NULL) { 934 icmp6stat.icp6s_tooshort++; 935 return(-1); 936 } 937#endif 938 939 if (nxt == IPPROTO_AH) 940 eoff += (eh->ip6e_len + 2) << 2; 941 else 942 eoff += (eh->ip6e_len + 1) << 3; 943 nxt = eh->ip6e_nxt; 944 break; 945 case IPPROTO_ROUTING: 946 /* 947 * When the erroneous packet contains a 948 * routing header, we should examine the 949 * header to determine the final destination. 950 * Otherwise, we can't properly update 951 * information that depends on the final 952 * destination (e.g. path MTU). 953 */ 954#ifndef PULLDOWN_TEST 955 IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(*rth), 956 -1); 957 rth = (struct ip6_rthdr *)(mtod(m, caddr_t) 958 + eoff); 959#else 960 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m, 961 eoff, sizeof(*rth)); 962 if (rth == NULL) { 963 icmp6stat.icp6s_tooshort++; 964 return(-1); 965 } 966#endif 967 rthlen = (rth->ip6r_len + 1) << 3; 968 /* 969 * XXX: currently there is no 970 * officially defined type other 971 * than type-0. 972 * Note that if the segment left field 973 * is 0, all intermediate hops must 974 * have been passed. 975 */ 976 if (rth->ip6r_segleft && 977 rth->ip6r_type == IPV6_RTHDR_TYPE_0) { 978 int hops; 979 980#ifndef PULLDOWN_TEST 981 IP6_EXTHDR_CHECK(m, 0, eoff + rthlen, 982 -1); 983 rth0 = (struct ip6_rthdr0 *)(mtod(m, caddr_t) + eoff); 984#else 985 IP6_EXTHDR_GET(rth0, 986 struct ip6_rthdr0 *, m, 987 eoff, rthlen); 988 if (rth0 == NULL) { 989 icmp6stat.icp6s_tooshort++; 990 return(-1); 991 } 992#endif 993 /* just ignore a bogus header */ 994 if ((rth0->ip6r0_len % 2) == 0 && 995 (hops = rth0->ip6r0_len/2)) 996 finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1); 997 } 998 eoff += rthlen; 999 nxt = rth->ip6r_nxt; 1000 break; 1001 case IPPROTO_FRAGMENT: 1002#ifndef PULLDOWN_TEST 1003 IP6_EXTHDR_CHECK(m, 0, eoff + 1004 sizeof(struct ip6_frag), 1005 -1); 1006 fh = (struct ip6_frag *)(mtod(m, caddr_t) 1007 + eoff); 1008#else 1009 IP6_EXTHDR_GET(fh, struct ip6_frag *, m, 1010 eoff, sizeof(*fh)); 1011 if (fh == NULL) { 1012 icmp6stat.icp6s_tooshort++; 1013 return(-1); 1014 } 1015#endif 1016 /* 1017 * Data after a fragment header is meaningless 1018 * unless it is the first fragment, but 1019 * we'll go to the notify label for path MTU 1020 * discovery. 1021 */ 1022 if (fh->ip6f_offlg & IP6F_OFF_MASK) 1023 goto notify; 1024 1025 eoff += sizeof(struct ip6_frag); 1026 nxt = fh->ip6f_nxt; 1027 break; 1028 default: 1029 /* 1030 * This case includes ESP and the No Next 1031 * Header. In such cases going to the notify 1032 * label does not have any meaning 1033 * (i.e. ctlfunc will be NULL), but we go 1034 * anyway since we might have to update 1035 * path MTU information. 1036 */ 1037 goto notify; 1038 } 1039 } 1040 notify: 1041#ifndef PULLDOWN_TEST 1042 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 1043#else 1044 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 1045 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 1046 if (icmp6 == NULL) { 1047 icmp6stat.icp6s_tooshort++; 1048 return(-1); 1049 } 1050#endif 1051 1052 eip6 = (struct ip6_hdr *)(icmp6 + 1); 1053 bzero(&icmp6dst, sizeof(icmp6dst)); 1054 icmp6dst.sin6_len = sizeof(struct sockaddr_in6); 1055 icmp6dst.sin6_family = AF_INET6; 1056 if (finaldst == NULL) 1057 icmp6dst.sin6_addr = eip6->ip6_dst; 1058 else 1059 icmp6dst.sin6_addr = *finaldst; 1060 icmp6dst.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif, 1061 &icmp6dst.sin6_addr); 1062#ifndef SCOPEDROUTING 1063 if (in6_embedscope(&icmp6dst.sin6_addr, &icmp6dst, 1064 NULL, NULL)) { 1065 /* should be impossbile */ 1066 nd6log((LOG_DEBUG, 1067 "icmp6_notify_error: in6_embedscope failed\n")); 1068 goto freeit; 1069 } 1070#endif 1071 1072 /* 1073 * retrieve parameters from the inner IPv6 header, and convert 1074 * them into sockaddr structures. 1075 */ 1076 bzero(&icmp6src, sizeof(icmp6src)); 1077 icmp6src.sin6_len = sizeof(struct sockaddr_in6); 1078 icmp6src.sin6_family = AF_INET6; 1079 icmp6src.sin6_addr = eip6->ip6_src; 1080 icmp6src.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif, 1081 &icmp6src.sin6_addr); 1082#ifndef SCOPEDROUTING 1083 if (in6_embedscope(&icmp6src.sin6_addr, &icmp6src, 1084 NULL, NULL)) { 1085 /* should be impossbile */ 1086 nd6log((LOG_DEBUG, 1087 "icmp6_notify_error: in6_embedscope failed\n")); 1088 goto freeit; 1089 } 1090#endif 1091 icmp6src.sin6_flowinfo = 1092 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK); 1093 1094 if (finaldst == NULL) 1095 finaldst = &eip6->ip6_dst; 1096 ip6cp.ip6c_m = m; 1097 ip6cp.ip6c_icmp6 = icmp6; 1098 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1); 1099 ip6cp.ip6c_off = eoff; 1100 ip6cp.ip6c_finaldst = finaldst; 1101 ip6cp.ip6c_src = &icmp6src; 1102 ip6cp.ip6c_nxt = nxt; 1103 1104 if (icmp6type == ICMP6_PACKET_TOO_BIG) { 1105 notifymtu = ntohl(icmp6->icmp6_mtu); 1106 ip6cp.ip6c_cmdarg = (void *)¬ifymtu; 1107 icmp6_mtudisc_update(&ip6cp, 1); /*XXX*/ 1108 } 1109 1110 ctlfunc = (void (*) __P((int, struct sockaddr *, void *))) 1111 (inet6sw[ip6_protox[nxt]].pr_ctlinput); 1112 if (ctlfunc) { 1113 (void) (*ctlfunc)(code, (struct sockaddr *)&icmp6dst, 1114 &ip6cp); 1115 } 1116 } 1117 return(0); 1118 1119 freeit: 1120 m_freem(m); 1121 return(-1); 1122} 1123 1124void 1125icmp6_mtudisc_update(ip6cp, validated) 1126 struct ip6ctlparam *ip6cp; 1127 int validated; 1128{ 1129 struct in6_addr *dst = ip6cp->ip6c_finaldst; 1130 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6; 1131 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */ 1132 u_int mtu = ntohl(icmp6->icmp6_mtu); 1133 struct rtentry *rt = NULL; 1134 struct sockaddr_in6 sin6; 1135 1136 if (!validated) 1137 return; 1138 1139 bzero(&sin6, sizeof(sin6)); 1140 sin6.sin6_family = PF_INET6; 1141 sin6.sin6_len = sizeof(struct sockaddr_in6); 1142 sin6.sin6_addr = *dst; 1143 /* XXX normally, this won't happen */ 1144 if (IN6_IS_ADDR_LINKLOCAL(dst)) { 1145 sin6.sin6_addr.s6_addr16[1] = 1146 htons(m->m_pkthdr.rcvif->if_index); 1147 } 1148 /* sin6.sin6_scope_id = XXX: should be set if DST is a scoped addr */ 1149 rt = rtalloc1((struct sockaddr *)&sin6, 0, 1150 RTF_CLONING | RTF_PRCLONING); 1151 1152 if (rt && (rt->rt_flags & RTF_HOST) 1153 && !(rt->rt_rmx.rmx_locks & RTV_MTU)) { 1154 if (mtu < IPV6_MMTU) { 1155 /* xxx */ 1156 rt->rt_rmx.rmx_locks |= RTV_MTU; 1157 } else if (mtu < rt->rt_ifp->if_mtu && 1158 rt->rt_rmx.rmx_mtu > mtu) { 1159 icmp6stat.icp6s_pmtuchg++; 1160 rt->rt_rmx.rmx_mtu = mtu; 1161 } 1162 } 1163 if (rt) 1164 rtfree(rt); 1165} 1166 1167/* 1168 * Process a Node Information Query packet, based on 1169 * draft-ietf-ipngwg-icmp-name-lookups-07. 1170 * 1171 * Spec incompatibilities: 1172 * - IPv6 Subject address handling 1173 * - IPv4 Subject address handling support missing 1174 * - Proxy reply (answer even if it's not for me) 1175 * - joins NI group address at in6_ifattach() time only, does not cope 1176 * with hostname changes by sethostname(3) 1177 */ 1178#define hostnamelen strlen(hostname) 1179static struct mbuf * 1180ni6_input(m, off) 1181 struct mbuf *m; 1182 int off; 1183{ 1184 struct icmp6_nodeinfo *ni6, *nni6; 1185 struct mbuf *n = NULL; 1186 u_int16_t qtype; 1187 int subjlen; 1188 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1189 struct ni_reply_fqdn *fqdn; 1190 int addrs; /* for NI_QTYPE_NODEADDR */ 1191 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */ 1192 struct sockaddr_in6 sin6; /* double meaning; ip6_dst and subjectaddr */ 1193 struct sockaddr_in6 sin6_d; /* XXX: we should retrieve this from m_aux */ 1194 struct ip6_hdr *ip6; 1195 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */ 1196 char *subj = NULL; 1197 struct in6_ifaddr *ia6 = NULL; 1198 1199 ip6 = mtod(m, struct ip6_hdr *); 1200#ifndef PULLDOWN_TEST 1201 ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off); 1202#else 1203 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6)); 1204 if (ni6 == NULL) { 1205 /* m is already reclaimed */ 1206 return NULL; 1207 } 1208#endif 1209 1210 /* 1211 * Validate IPv6 destination address. 1212 * 1213 * The Responder must discard the Query without further processing 1214 * unless it is one of the Responder's unicast or anycast addresses, or 1215 * a link-local scope multicast address which the Responder has joined. 1216 * [icmp-name-lookups-07, Section 4.] 1217 */ 1218 bzero(&sin6, sizeof(sin6)); 1219 sin6.sin6_family = AF_INET6; 1220 sin6.sin6_len = sizeof(struct sockaddr_in6); 1221 bcopy(&ip6->ip6_dst, &sin6.sin6_addr, sizeof(sin6.sin6_addr)); 1222 /* XXX scopeid */ 1223 if ((ia6 = (struct in6_ifaddr *)ifa_ifwithaddr((struct sockaddr *)&sin6)) != NULL) { 1224 /* unicast/anycast, fine */ 1225 if ((ia6->ia6_flags & IN6_IFF_TEMPORARY) != 0 && 1226 (icmp6_nodeinfo & 4) == 0) { 1227 nd6log((LOG_DEBUG, "ni6_input: ignore node info to " 1228 "a temporary address in %s:%d", 1229 __FILE__, __LINE__)); 1230 goto bad; 1231 } 1232 } else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr)) 1233 ; /* link-local multicast, fine */ 1234 else 1235 goto bad; 1236 1237 /* validate query Subject field. */ 1238 qtype = ntohs(ni6->ni_qtype); 1239 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo); 1240 switch (qtype) { 1241 case NI_QTYPE_NOOP: 1242 case NI_QTYPE_SUPTYPES: 1243 /* 07 draft */ 1244 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0) 1245 break; 1246 /* FALLTHROUGH */ 1247 case NI_QTYPE_FQDN: 1248 case NI_QTYPE_NODEADDR: 1249 switch (ni6->ni_code) { 1250 case ICMP6_NI_SUBJ_IPV6: 1251#if ICMP6_NI_SUBJ_IPV6 != 0 1252 case 0: 1253#endif 1254 /* 1255 * backward compatibility - try to accept 03 draft 1256 * format, where no Subject is present. 1257 */ 1258 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 && 1259 subjlen == 0) { 1260 oldfqdn++; 1261 break; 1262 } 1263#if ICMP6_NI_SUBJ_IPV6 != 0 1264 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6) 1265 goto bad; 1266#endif 1267 1268 if (subjlen != sizeof(sin6.sin6_addr)) 1269 goto bad; 1270 1271 /* 1272 * Validate Subject address. 1273 * 1274 * Not sure what exactly "address belongs to the node" 1275 * means in the spec, is it just unicast, or what? 1276 * 1277 * At this moment we consider Subject address as 1278 * "belong to the node" if the Subject address equals 1279 * to the IPv6 destination address; validation for 1280 * IPv6 destination address should have done enough 1281 * check for us. 1282 * 1283 * We do not do proxy at this moment. 1284 */ 1285 /* m_pulldown instead of copy? */ 1286 m_copydata(m, off + sizeof(struct icmp6_nodeinfo), 1287 subjlen, (caddr_t)&sin6.sin6_addr); 1288 sin6.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif, 1289 &sin6.sin6_addr); 1290#ifndef SCOPEDROUTING 1291 in6_embedscope(&sin6.sin6_addr, &sin6, NULL, NULL); 1292#endif 1293 bzero(&sin6_d, sizeof(sin6_d)); 1294 sin6_d.sin6_family = AF_INET6; /* not used, actually */ 1295 sin6_d.sin6_len = sizeof(sin6_d); /* ditto */ 1296 sin6_d.sin6_addr = ip6->ip6_dst; 1297 sin6_d.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif, 1298 &ip6->ip6_dst); 1299#ifndef SCOPEDROUTING 1300 in6_embedscope(&sin6_d.sin6_addr, &sin6_d, NULL, NULL); 1301#endif 1302 subj = (char *)&sin6; 1303 if (SA6_ARE_ADDR_EQUAL(&sin6, &sin6_d)) 1304 break; 1305 1306 /* 1307 * XXX if we are to allow other cases, we should really 1308 * be careful about scope here. 1309 * basically, we should disallow queries toward IPv6 1310 * destination X with subject Y, if scope(X) > scope(Y). 1311 * if we allow scope(X) > scope(Y), it will result in 1312 * information leakage across scope boundary. 1313 */ 1314 goto bad; 1315 1316 case ICMP6_NI_SUBJ_FQDN: 1317 /* 1318 * Validate Subject name with gethostname(3). 1319 * 1320 * The behavior may need some debate, since: 1321 * - we are not sure if the node has FQDN as 1322 * hostname (returned by gethostname(3)). 1323 * - the code does wildcard match for truncated names. 1324 * however, we are not sure if we want to perform 1325 * wildcard match, if gethostname(3) side has 1326 * truncated hostname. 1327 */ 1328 n = ni6_nametodns(hostname, hostnamelen, 0); 1329 if (!n || n->m_next || n->m_len == 0) 1330 goto bad; 1331 IP6_EXTHDR_GET(subj, char *, m, 1332 off + sizeof(struct icmp6_nodeinfo), subjlen); 1333 if (subj == NULL) 1334 goto bad; 1335 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *), 1336 n->m_len)) { 1337 goto bad; 1338 } 1339 m_freem(n); 1340 n = NULL; 1341 break; 1342 1343 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */ 1344 default: 1345 goto bad; 1346 } 1347 break; 1348 } 1349 1350 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */ 1351 switch (qtype) { 1352 case NI_QTYPE_FQDN: 1353 if ((icmp6_nodeinfo & 1) == 0) 1354 goto bad; 1355 break; 1356 case NI_QTYPE_NODEADDR: 1357 if ((icmp6_nodeinfo & 2) == 0) 1358 goto bad; 1359 break; 1360 } 1361 1362 /* guess reply length */ 1363 switch (qtype) { 1364 case NI_QTYPE_NOOP: 1365 break; /* no reply data */ 1366 case NI_QTYPE_SUPTYPES: 1367 replylen += sizeof(u_int32_t); 1368 break; 1369 case NI_QTYPE_FQDN: 1370 /* XXX will append an mbuf */ 1371 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1372 break; 1373 case NI_QTYPE_NODEADDR: 1374 addrs = ni6_addrs(ni6, m, &ifp, subj); 1375 if ((replylen += addrs * (sizeof(struct in6_addr) + 1376 sizeof(u_int32_t))) > MCLBYTES) 1377 replylen = MCLBYTES; /* XXX: will truncate pkt later */ 1378 break; 1379 default: 1380 /* 1381 * XXX: We must return a reply with the ICMP6 code 1382 * `unknown Qtype' in this case. However we regard the case 1383 * as an FQDN query for backward compatibility. 1384 * Older versions set a random value to this field, 1385 * so it rarely varies in the defined qtypes. 1386 * But the mechanism is not reliable... 1387 * maybe we should obsolete older versions. 1388 */ 1389 qtype = NI_QTYPE_FQDN; 1390 /* XXX will append an mbuf */ 1391 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1392 oldfqdn++; 1393 break; 1394 } 1395 1396 /* allocate an mbuf to reply. */ 1397 MGETHDR(n, M_DONTWAIT, m->m_type); 1398 if (n == NULL) { 1399 m_freem(m); 1400 return(NULL); 1401 } 1402 M_MOVE_PKTHDR(n, m); /* just for recvif */ 1403 if (replylen > MHLEN) { 1404 if (replylen > MCLBYTES) { 1405 /* 1406 * XXX: should we try to allocate more? But MCLBYTES 1407 * is probably much larger than IPV6_MMTU... 1408 */ 1409 goto bad; 1410 } 1411 MCLGET(n, M_DONTWAIT); 1412 if ((n->m_flags & M_EXT) == 0) { 1413 goto bad; 1414 } 1415 } 1416 n->m_pkthdr.len = n->m_len = replylen; 1417 1418 /* copy mbuf header and IPv6 + Node Information base headers */ 1419 bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr)); 1420 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1); 1421 bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo)); 1422 1423 /* qtype dependent procedure */ 1424 switch (qtype) { 1425 case NI_QTYPE_NOOP: 1426 nni6->ni_code = ICMP6_NI_SUCCESS; 1427 nni6->ni_flags = 0; 1428 break; 1429 case NI_QTYPE_SUPTYPES: 1430 { 1431 u_int32_t v; 1432 nni6->ni_code = ICMP6_NI_SUCCESS; 1433 nni6->ni_flags = htons(0x0000); /* raw bitmap */ 1434 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */ 1435 v = (u_int32_t)htonl(0x0000000f); 1436 bcopy(&v, nni6 + 1, sizeof(u_int32_t)); 1437 break; 1438 } 1439 case NI_QTYPE_FQDN: 1440 nni6->ni_code = ICMP6_NI_SUCCESS; 1441 fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) + 1442 sizeof(struct ip6_hdr) + 1443 sizeof(struct icmp6_nodeinfo)); 1444 nni6->ni_flags = 0; /* XXX: meaningless TTL */ 1445 fqdn->ni_fqdn_ttl = 0; /* ditto. */ 1446 /* 1447 * XXX do we really have FQDN in variable "hostname"? 1448 */ 1449 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn); 1450 if (n->m_next == NULL) 1451 goto bad; 1452 /* XXX we assume that n->m_next is not a chain */ 1453 if (n->m_next->m_next != NULL) 1454 goto bad; 1455 n->m_pkthdr.len += n->m_next->m_len; 1456 break; 1457 case NI_QTYPE_NODEADDR: 1458 { 1459 int lenlim, copied; 1460 1461 nni6->ni_code = ICMP6_NI_SUCCESS; 1462 n->m_pkthdr.len = n->m_len = 1463 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1464 lenlim = M_TRAILINGSPACE(n); 1465 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim); 1466 /* XXX: reset mbuf length */ 1467 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 1468 sizeof(struct icmp6_nodeinfo) + copied; 1469 break; 1470 } 1471 default: 1472 break; /* XXX impossible! */ 1473 } 1474 1475 nni6->ni_type = ICMP6_NI_REPLY; 1476 m_freem(m); 1477 return(n); 1478 1479 bad: 1480 m_freem(m); 1481 if (n) 1482 m_freem(n); 1483 return(NULL); 1484} 1485#undef hostnamelen 1486 1487/* 1488 * make a mbuf with DNS-encoded string. no compression support. 1489 * 1490 * XXX names with less than 2 dots (like "foo" or "foo.section") will be 1491 * treated as truncated name (two \0 at the end). this is a wild guess. 1492 */ 1493static struct mbuf * 1494ni6_nametodns(name, namelen, old) 1495 const char *name; 1496 int namelen; 1497 int old; /* return pascal string if non-zero */ 1498{ 1499 struct mbuf *m; 1500 char *cp, *ep; 1501 const char *p, *q; 1502 int i, len, nterm; 1503 1504 if (old) 1505 len = namelen + 1; 1506 else 1507 len = MCLBYTES; 1508 1509 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */ 1510 MGET(m, M_DONTWAIT, MT_DATA); 1511 if (m && len > MLEN) { 1512 MCLGET(m, M_DONTWAIT); 1513 if ((m->m_flags & M_EXT) == 0) 1514 goto fail; 1515 } 1516 if (!m) 1517 goto fail; 1518 m->m_next = NULL; 1519 1520 if (old) { 1521 m->m_len = len; 1522 *mtod(m, char *) = namelen; 1523 bcopy(name, mtod(m, char *) + 1, namelen); 1524 return m; 1525 } else { 1526 m->m_len = 0; 1527 cp = mtod(m, char *); 1528 ep = mtod(m, char *) + M_TRAILINGSPACE(m); 1529 1530 /* if not certain about my name, return empty buffer */ 1531 if (namelen == 0) 1532 return m; 1533 1534 /* 1535 * guess if it looks like shortened hostname, or FQDN. 1536 * shortened hostname needs two trailing "\0". 1537 */ 1538 i = 0; 1539 for (p = name; p < name + namelen; p++) { 1540 if (*p && *p == '.') 1541 i++; 1542 } 1543 if (i < 2) 1544 nterm = 2; 1545 else 1546 nterm = 1; 1547 1548 p = name; 1549 while (cp < ep && p < name + namelen) { 1550 i = 0; 1551 for (q = p; q < name + namelen && *q && *q != '.'; q++) 1552 i++; 1553 /* result does not fit into mbuf */ 1554 if (cp + i + 1 >= ep) 1555 goto fail; 1556 /* 1557 * DNS label length restriction, RFC1035 page 8. 1558 * "i == 0" case is included here to avoid returning 1559 * 0-length label on "foo..bar". 1560 */ 1561 if (i <= 0 || i >= 64) 1562 goto fail; 1563 *cp++ = i; 1564 bcopy(p, cp, i); 1565 cp += i; 1566 p = q; 1567 if (p < name + namelen && *p == '.') 1568 p++; 1569 } 1570 /* termination */ 1571 if (cp + nterm >= ep) 1572 goto fail; 1573 while (nterm-- > 0) 1574 *cp++ = '\0'; 1575 m->m_len = cp - mtod(m, char *); 1576 return m; 1577 } 1578 1579 panic("should not reach here"); 1580 /* NOTREACHED */ 1581 1582 fail: 1583 if (m) 1584 m_freem(m); 1585 return NULL; 1586} 1587 1588/* 1589 * check if two DNS-encoded string matches. takes care of truncated 1590 * form (with \0\0 at the end). no compression support. 1591 * XXX upper/lowercase match (see RFC2065) 1592 */ 1593static int 1594ni6_dnsmatch(a, alen, b, blen) 1595 const char *a; 1596 int alen; 1597 const char *b; 1598 int blen; 1599{ 1600 const char *a0, *b0; 1601 int l; 1602 1603 /* simplest case - need validation? */ 1604 if (alen == blen && bcmp(a, b, alen) == 0) 1605 return 1; 1606 1607 a0 = a; 1608 b0 = b; 1609 1610 /* termination is mandatory */ 1611 if (alen < 2 || blen < 2) 1612 return 0; 1613 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0') 1614 return 0; 1615 alen--; 1616 blen--; 1617 1618 while (a - a0 < alen && b - b0 < blen) { 1619 if (a - a0 + 1 > alen || b - b0 + 1 > blen) 1620 return 0; 1621 1622 if ((signed char)a[0] < 0 || (signed char)b[0] < 0) 1623 return 0; 1624 /* we don't support compression yet */ 1625 if (a[0] >= 64 || b[0] >= 64) 1626 return 0; 1627 1628 /* truncated case */ 1629 if (a[0] == 0 && a - a0 == alen - 1) 1630 return 1; 1631 if (b[0] == 0 && b - b0 == blen - 1) 1632 return 1; 1633 if (a[0] == 0 || b[0] == 0) 1634 return 0; 1635 1636 if (a[0] != b[0]) 1637 return 0; 1638 l = a[0]; 1639 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen) 1640 return 0; 1641 if (bcmp(a + 1, b + 1, l) != 0) 1642 return 0; 1643 1644 a += 1 + l; 1645 b += 1 + l; 1646 } 1647 1648 if (a - a0 == alen && b - b0 == blen) 1649 return 1; 1650 else 1651 return 0; 1652} 1653 1654/* 1655 * calculate the number of addresses to be returned in the node info reply. 1656 */ 1657static int 1658ni6_addrs(ni6, m, ifpp, subj) 1659 struct icmp6_nodeinfo *ni6; 1660 struct mbuf *m; 1661 struct ifnet **ifpp; 1662 char *subj; 1663{ 1664 struct ifnet *ifp; 1665 struct in6_ifaddr *ifa6; 1666 struct ifaddr *ifa; 1667 struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */ 1668 int addrs = 0, addrsofif, iffound = 0; 1669 int niflags = ni6->ni_flags; 1670 1671 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) { 1672 switch (ni6->ni_code) { 1673 case ICMP6_NI_SUBJ_IPV6: 1674 if (subj == NULL) /* must be impossible... */ 1675 return(0); 1676 subj_ip6 = (struct sockaddr_in6 *)subj; 1677 break; 1678 default: 1679 /* 1680 * XXX: we only support IPv6 subject address for 1681 * this Qtype. 1682 */ 1683 return(0); 1684 } 1685 } 1686 1687 IFNET_RLOCK(); 1688 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) 1689 { 1690 addrsofif = 0; 1691 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 1692 { 1693 if (ifa->ifa_addr->sa_family != AF_INET6) 1694 continue; 1695 ifa6 = (struct in6_ifaddr *)ifa; 1696 1697 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 && 1698 IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr, 1699 &ifa6->ia_addr.sin6_addr)) 1700 iffound = 1; 1701 1702 /* 1703 * IPv4-mapped addresses can only be returned by a 1704 * Node Information proxy, since they represent 1705 * addresses of IPv4-only nodes, which perforce do 1706 * not implement this protocol. 1707 * [icmp-name-lookups-07, Section 5.4] 1708 * So we don't support NI_NODEADDR_FLAG_COMPAT in 1709 * this function at this moment. 1710 */ 1711 1712 /* What do we have to do about ::1? */ 1713 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) { 1714 case IPV6_ADDR_SCOPE_LINKLOCAL: 1715 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1716 continue; 1717 break; 1718 case IPV6_ADDR_SCOPE_SITELOCAL: 1719 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1720 continue; 1721 break; 1722 case IPV6_ADDR_SCOPE_GLOBAL: 1723 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1724 continue; 1725 break; 1726 default: 1727 continue; 1728 } 1729 1730 /* 1731 * check if anycast is okay. 1732 * XXX: just experimental. not in the spec. 1733 */ 1734 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1735 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 1736 continue; /* we need only unicast addresses */ 1737 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 && 1738 (icmp6_nodeinfo & 4) == 0) { 1739 continue; 1740 } 1741 addrsofif++; /* count the address */ 1742 } 1743 if (iffound) { 1744 *ifpp = ifp; 1745 IFNET_RUNLOCK(); 1746 return(addrsofif); 1747 } 1748 1749 addrs += addrsofif; 1750 } 1751 IFNET_RUNLOCK(); 1752 1753 return(addrs); 1754} 1755 1756static int 1757ni6_store_addrs(ni6, nni6, ifp0, resid) 1758 struct icmp6_nodeinfo *ni6, *nni6; 1759 struct ifnet *ifp0; 1760 int resid; 1761{ 1762 struct ifnet *ifp = ifp0 ? ifp0 : TAILQ_FIRST(&ifnet); 1763 struct in6_ifaddr *ifa6; 1764 struct ifaddr *ifa; 1765 struct ifnet *ifp_dep = NULL; 1766 int copied = 0, allow_deprecated = 0; 1767 u_char *cp = (u_char *)(nni6 + 1); 1768 int niflags = ni6->ni_flags; 1769 u_int32_t ltime; 1770 1771 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL)) 1772 return(0); /* needless to copy */ 1773 1774 IFNET_RLOCK(); 1775 again: 1776 for (; ifp; ifp = TAILQ_NEXT(ifp, if_list)) 1777 { 1778 for (ifa = ifp->if_addrlist.tqh_first; ifa; 1779 ifa = ifa->ifa_list.tqe_next) 1780 { 1781 if (ifa->ifa_addr->sa_family != AF_INET6) 1782 continue; 1783 ifa6 = (struct in6_ifaddr *)ifa; 1784 1785 if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) != 0 && 1786 allow_deprecated == 0) { 1787 /* 1788 * prefererred address should be put before 1789 * deprecated addresses. 1790 */ 1791 1792 /* record the interface for later search */ 1793 if (ifp_dep == NULL) 1794 ifp_dep = ifp; 1795 1796 continue; 1797 } 1798 else if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) == 0 && 1799 allow_deprecated != 0) 1800 continue; /* we now collect deprecated addrs */ 1801 1802 /* What do we have to do about ::1? */ 1803 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) { 1804 case IPV6_ADDR_SCOPE_LINKLOCAL: 1805 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1806 continue; 1807 break; 1808 case IPV6_ADDR_SCOPE_SITELOCAL: 1809 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1810 continue; 1811 break; 1812 case IPV6_ADDR_SCOPE_GLOBAL: 1813 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1814 continue; 1815 break; 1816 default: 1817 continue; 1818 } 1819 1820 /* 1821 * check if anycast is okay. 1822 * XXX: just experimental. not in the spec. 1823 */ 1824 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1825 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 1826 continue; 1827 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 && 1828 (icmp6_nodeinfo & 4) == 0) { 1829 continue; 1830 } 1831 1832 /* now we can copy the address */ 1833 if (resid < sizeof(struct in6_addr) + 1834 sizeof(u_int32_t)) { 1835 /* 1836 * We give up much more copy. 1837 * Set the truncate flag and return. 1838 */ 1839 nni6->ni_flags |= 1840 NI_NODEADDR_FLAG_TRUNCATE; 1841 IFNET_RUNLOCK(); 1842 return(copied); 1843 } 1844 1845 /* 1846 * Set the TTL of the address. 1847 * The TTL value should be one of the following 1848 * according to the specification: 1849 * 1850 * 1. The remaining lifetime of a DHCP lease on the 1851 * address, or 1852 * 2. The remaining Valid Lifetime of a prefix from 1853 * which the address was derived through Stateless 1854 * Autoconfiguration. 1855 * 1856 * Note that we currently do not support stateful 1857 * address configuration by DHCPv6, so the former 1858 * case can't happen. 1859 */ 1860 if (ifa6->ia6_lifetime.ia6t_expire == 0) 1861 ltime = ND6_INFINITE_LIFETIME; 1862 else { 1863 if (ifa6->ia6_lifetime.ia6t_expire > 1864 time_second) 1865 ltime = htonl(ifa6->ia6_lifetime.ia6t_expire - time_second); 1866 else 1867 ltime = 0; 1868 } 1869 1870 bcopy(<ime, cp, sizeof(u_int32_t)); 1871 cp += sizeof(u_int32_t); 1872 1873 /* copy the address itself */ 1874 bcopy(&ifa6->ia_addr.sin6_addr, cp, 1875 sizeof(struct in6_addr)); 1876 /* XXX: KAME link-local hack; remove ifindex */ 1877 if (IN6_IS_ADDR_LINKLOCAL(&ifa6->ia_addr.sin6_addr)) 1878 ((struct in6_addr *)cp)->s6_addr16[1] = 0; 1879 cp += sizeof(struct in6_addr); 1880 1881 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1882 copied += (sizeof(struct in6_addr) + 1883 sizeof(u_int32_t)); 1884 } 1885 if (ifp0) /* we need search only on the specified IF */ 1886 break; 1887 } 1888 1889 if (allow_deprecated == 0 && ifp_dep != NULL) { 1890 ifp = ifp_dep; 1891 allow_deprecated = 1; 1892 1893 goto again; 1894 } 1895 1896 IFNET_RUNLOCK(); 1897 1898 return(copied); 1899} 1900 1901/* 1902 * XXX almost dup'ed code with rip6_input. 1903 */ 1904static int 1905icmp6_rip6_input(mp, off) 1906 struct mbuf **mp; 1907 int off; 1908{ 1909 struct mbuf *m = *mp; 1910 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1911 struct in6pcb *in6p; 1912 struct in6pcb *last = NULL; 1913 struct sockaddr_in6 rip6src; 1914 struct icmp6_hdr *icmp6; 1915 struct mbuf *opts = NULL; 1916 1917#ifndef PULLDOWN_TEST 1918 /* this is assumed to be safe. */ 1919 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off); 1920#else 1921 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 1922 if (icmp6 == NULL) { 1923 /* m is already reclaimed */ 1924 return IPPROTO_DONE; 1925 } 1926#endif 1927 1928 bzero(&rip6src, sizeof(rip6src)); 1929 rip6src.sin6_len = sizeof(struct sockaddr_in6); 1930 rip6src.sin6_family = AF_INET6; 1931 /* KAME hack: recover scopeid */ 1932 (void)in6_recoverscope(&rip6src, &ip6->ip6_src, m->m_pkthdr.rcvif); 1933 1934 LIST_FOREACH(in6p, &ripcb, inp_list) 1935 { 1936 if ((in6p->inp_vflag & INP_IPV6) == 0) 1937 continue; 1938#ifdef HAVE_NRL_INPCB 1939 if (!(in6p->in6p_flags & INP_IPV6)) 1940 continue; 1941#endif 1942 if (in6p->in6p_ip6_nxt != IPPROTO_ICMPV6) 1943 continue; 1944 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && 1945 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst)) 1946 continue; 1947 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) && 1948 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src)) 1949 continue; 1950 if (in6p->in6p_icmp6filt 1951 && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type, 1952 in6p->in6p_icmp6filt)) 1953 continue; 1954 if (last) { 1955 struct mbuf *n; 1956 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { 1957 if (last->in6p_flags & IN6P_CONTROLOPTS) 1958 ip6_savecontrol(last, &opts, ip6, n); 1959 /* strip intermediate headers */ 1960 m_adj(n, off); 1961 if (sbappendaddr(&last->in6p_socket->so_rcv, 1962 (struct sockaddr *)&rip6src, 1963 n, opts) == 0) { 1964 /* should notify about lost packet */ 1965 m_freem(n); 1966 if (opts) { 1967 m_freem(opts); 1968 } 1969 } else 1970 sorwakeup(last->in6p_socket); 1971 opts = NULL; 1972 } 1973 } 1974 last = in6p; 1975 } 1976 if (last) { 1977 if (last->in6p_flags & IN6P_CONTROLOPTS) 1978 ip6_savecontrol(last, &opts, ip6, m); 1979 /* strip intermediate headers */ 1980 m_adj(m, off); 1981 if (sbappendaddr(&last->in6p_socket->so_rcv, 1982 (struct sockaddr *)&rip6src, m, opts) == 0) { 1983 m_freem(m); 1984 if (opts) 1985 m_freem(opts); 1986 } else 1987 sorwakeup(last->in6p_socket); 1988 } else { 1989 m_freem(m); 1990 ip6stat.ip6s_delivered--; 1991 } 1992 return IPPROTO_DONE; 1993} 1994 1995/* 1996 * Reflect the ip6 packet back to the source. 1997 * OFF points to the icmp6 header, counted from the top of the mbuf. 1998 */ 1999void 2000icmp6_reflect(m, off) 2001 struct mbuf *m; 2002 size_t off; 2003{ 2004 struct ip6_hdr *ip6; 2005 struct icmp6_hdr *icmp6; 2006 struct in6_ifaddr *ia; 2007 struct in6_addr t, *src = 0; 2008 int plen; 2009 int type, code; 2010 struct ifnet *outif = NULL; 2011 struct sockaddr_in6 sa6_src, sa6_dst; 2012#ifdef COMPAT_RFC1885 2013 int mtu = IPV6_MMTU; 2014 struct sockaddr_in6 *sin6 = &icmp6_reflect_rt.ro_dst; 2015#endif 2016 2017 /* too short to reflect */ 2018 if (off < sizeof(struct ip6_hdr)) { 2019 nd6log((LOG_DEBUG, 2020 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n", 2021 (u_long)off, (u_long)sizeof(struct ip6_hdr), 2022 __FILE__, __LINE__)); 2023 goto bad; 2024 } 2025 2026 /* 2027 * If there are extra headers between IPv6 and ICMPv6, strip 2028 * off that header first. 2029 */ 2030#ifdef DIAGNOSTIC 2031 if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN) 2032 panic("assumption failed in icmp6_reflect"); 2033#endif 2034 if (off > sizeof(struct ip6_hdr)) { 2035 size_t l; 2036 struct ip6_hdr nip6; 2037 2038 l = off - sizeof(struct ip6_hdr); 2039 m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6); 2040 m_adj(m, l); 2041 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2042 if (m->m_len < l) { 2043 if ((m = m_pullup(m, l)) == NULL) 2044 return; 2045 } 2046 bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6)); 2047 } else /* off == sizeof(struct ip6_hdr) */ { 2048 size_t l; 2049 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2050 if (m->m_len < l) { 2051 if ((m = m_pullup(m, l)) == NULL) 2052 return; 2053 } 2054 } 2055 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr); 2056 ip6 = mtod(m, struct ip6_hdr *); 2057 ip6->ip6_nxt = IPPROTO_ICMPV6; 2058 icmp6 = (struct icmp6_hdr *)(ip6 + 1); 2059 type = icmp6->icmp6_type; /* keep type for statistics */ 2060 code = icmp6->icmp6_code; /* ditto. */ 2061 2062 t = ip6->ip6_dst; 2063 /* 2064 * ip6_input() drops a packet if its src is multicast. 2065 * So, the src is never multicast. 2066 */ 2067 ip6->ip6_dst = ip6->ip6_src; 2068 2069 /* 2070 * XXX: make sure to embed scope zone information, using 2071 * already embedded IDs or the received interface (if any). 2072 * Note that rcvif may be NULL. 2073 * TODO: scoped routing case (XXX). 2074 */ 2075 bzero(&sa6_src, sizeof(sa6_src)); 2076 sa6_src.sin6_family = AF_INET6; 2077 sa6_src.sin6_len = sizeof(sa6_src); 2078 sa6_src.sin6_addr = ip6->ip6_dst; 2079 in6_recoverscope(&sa6_src, &ip6->ip6_dst, m->m_pkthdr.rcvif); 2080 in6_embedscope(&ip6->ip6_dst, &sa6_src, NULL, NULL); 2081 bzero(&sa6_dst, sizeof(sa6_dst)); 2082 sa6_dst.sin6_family = AF_INET6; 2083 sa6_dst.sin6_len = sizeof(sa6_dst); 2084 sa6_dst.sin6_addr = t; 2085 in6_recoverscope(&sa6_dst, &t, m->m_pkthdr.rcvif); 2086 in6_embedscope(&t, &sa6_dst, NULL, NULL); 2087 2088#ifdef COMPAT_RFC1885 2089 /* 2090 * xxx guess MTU 2091 * RFC 1885 requires that echo reply should be truncated if it 2092 * does not fit in with (return) path MTU, but the description was 2093 * removed in the new spec. 2094 */ 2095 if (icmp6_reflect_rt.ro_rt == 0 || 2096 ! (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &ip6->ip6_dst))) { 2097 if (icmp6_reflect_rt.ro_rt) { 2098 RTFREE(icmp6_reflect_rt.ro_rt); 2099 icmp6_reflect_rt.ro_rt = 0; 2100 } 2101 bzero(sin6, sizeof(*sin6)); 2102 sin6->sin6_family = PF_INET6; 2103 sin6->sin6_len = sizeof(struct sockaddr_in6); 2104 sin6->sin6_addr = ip6->ip6_dst; 2105 2106 rtalloc_ign((struct route *)&icmp6_reflect_rt.ro_rt, 2107 RTF_PRCLONING); 2108 } 2109 2110 if (icmp6_reflect_rt.ro_rt == 0) 2111 goto bad; 2112 2113 if ((icmp6_reflect_rt.ro_rt->rt_flags & RTF_HOST) 2114 && mtu < icmp6_reflect_rt.ro_rt->rt_ifp->if_mtu) 2115 mtu = icmp6_reflect_rt.ro_rt->rt_rmx.rmx_mtu; 2116 2117 if (mtu < m->m_pkthdr.len) { 2118 plen -= (m->m_pkthdr.len - mtu); 2119 m_adj(m, mtu - m->m_pkthdr.len); 2120 } 2121#endif 2122 /* 2123 * If the incoming packet was addressed directly to us(i.e. unicast), 2124 * use dst as the src for the reply. 2125 * The IN6_IFF_NOTREADY case would be VERY rare, but is possible 2126 * (for example) when we encounter an error while forwarding procedure 2127 * destined to a duplicated address of ours. 2128 */ 2129 for (ia = in6_ifaddr; ia; ia = ia->ia_next) 2130 if (IN6_ARE_ADDR_EQUAL(&t, &ia->ia_addr.sin6_addr) && 2131 (ia->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) { 2132 src = &t; 2133 break; 2134 } 2135 if (ia == NULL && IN6_IS_ADDR_LINKLOCAL(&t) && (m->m_flags & M_LOOP)) { 2136 /* 2137 * This is the case if the dst is our link-local address 2138 * and the sender is also ourselves. 2139 */ 2140 src = &t; 2141 } 2142 2143 if (src == 0) { 2144 int e; 2145 struct route_in6 ro; 2146 2147 /* 2148 * This case matches to multicasts, our anycast, or unicasts 2149 * that we do not own. Select a source address based on the 2150 * source address of the erroneous packet. 2151 */ 2152 bzero(&ro, sizeof(ro)); 2153 src = in6_selectsrc(&sa6_src, NULL, NULL, &ro, NULL, &e); 2154 if (ro.ro_rt) 2155 RTFREE(ro.ro_rt); /* XXX: we could use this */ 2156 if (src == NULL) { 2157 nd6log((LOG_DEBUG, 2158 "icmp6_reflect: source can't be determined: " 2159 "dst=%s, error=%d\n", 2160 ip6_sprintf(&sa6_src.sin6_addr), e)); 2161 goto bad; 2162 } 2163 } 2164 2165 ip6->ip6_src = *src; 2166 2167 ip6->ip6_flow = 0; 2168 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2169 ip6->ip6_vfc |= IPV6_VERSION; 2170 ip6->ip6_nxt = IPPROTO_ICMPV6; 2171 if (m->m_pkthdr.rcvif) { 2172 /* XXX: This may not be the outgoing interface */ 2173 ip6->ip6_hlim = nd_ifinfo[m->m_pkthdr.rcvif->if_index].chlim; 2174 } else 2175 ip6->ip6_hlim = ip6_defhlim; 2176 2177 icmp6->icmp6_cksum = 0; 2178 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6, 2179 sizeof(struct ip6_hdr), plen); 2180 2181 /* 2182 * XXX option handling 2183 */ 2184 2185 m->m_flags &= ~(M_BCAST|M_MCAST); 2186 2187#ifdef COMPAT_RFC1885 2188 ip6_output(m, NULL, &icmp6_reflect_rt, 0, NULL, &outif, NULL); 2189#else 2190 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL); 2191#endif 2192 if (outif) 2193 icmp6_ifoutstat_inc(outif, type, code); 2194 2195 return; 2196 2197 bad: 2198 m_freem(m); 2199 return; 2200} 2201 2202void 2203icmp6_fasttimo() 2204{ 2205 2206 mld6_fasttimeo(); 2207} 2208 2209static const char * 2210icmp6_redirect_diag(src6, dst6, tgt6) 2211 struct in6_addr *src6; 2212 struct in6_addr *dst6; 2213 struct in6_addr *tgt6; 2214{ 2215 static char buf[1024]; 2216 snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)", 2217 ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6)); 2218 return buf; 2219} 2220 2221void 2222icmp6_redirect_input(m, off) 2223 struct mbuf *m; 2224 int off; 2225{ 2226 struct ifnet *ifp = m->m_pkthdr.rcvif; 2227 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 2228 struct nd_redirect *nd_rd; 2229 int icmp6len = ntohs(ip6->ip6_plen); 2230 char *lladdr = NULL; 2231 int lladdrlen = 0; 2232 u_char *redirhdr = NULL; 2233 int redirhdrlen = 0; 2234 struct rtentry *rt = NULL; 2235 int is_router; 2236 int is_onlink; 2237 struct in6_addr src6 = ip6->ip6_src; 2238 struct in6_addr redtgt6; 2239 struct in6_addr reddst6; 2240 union nd_opts ndopts; 2241 2242 if (!m || !ifp) 2243 return; 2244 2245 /* XXX if we are router, we don't update route by icmp6 redirect */ 2246 if (ip6_forwarding) 2247 goto freeit; 2248 if (!icmp6_rediraccept) 2249 goto freeit; 2250 2251#ifndef PULLDOWN_TEST 2252 IP6_EXTHDR_CHECK(m, off, icmp6len,); 2253 nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off); 2254#else 2255 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len); 2256 if (nd_rd == NULL) { 2257 icmp6stat.icp6s_tooshort++; 2258 return; 2259 } 2260#endif 2261 redtgt6 = nd_rd->nd_rd_target; 2262 reddst6 = nd_rd->nd_rd_dst; 2263 2264 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 2265 redtgt6.s6_addr16[1] = htons(ifp->if_index); 2266 if (IN6_IS_ADDR_LINKLOCAL(&reddst6)) 2267 reddst6.s6_addr16[1] = htons(ifp->if_index); 2268 2269 /* validation */ 2270 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) { 2271 nd6log((LOG_ERR, 2272 "ICMP6 redirect sent from %s rejected; " 2273 "must be from linklocal\n", ip6_sprintf(&src6))); 2274 goto bad; 2275 } 2276 if (ip6->ip6_hlim != 255) { 2277 nd6log((LOG_ERR, 2278 "ICMP6 redirect sent from %s rejected; " 2279 "hlim=%d (must be 255)\n", 2280 ip6_sprintf(&src6), ip6->ip6_hlim)); 2281 goto bad; 2282 } 2283 { 2284 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */ 2285 struct sockaddr_in6 sin6; 2286 struct in6_addr *gw6; 2287 2288 bzero(&sin6, sizeof(sin6)); 2289 sin6.sin6_family = AF_INET6; 2290 sin6.sin6_len = sizeof(struct sockaddr_in6); 2291 bcopy(&reddst6, &sin6.sin6_addr, sizeof(reddst6)); 2292 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL); 2293 if (rt) { 2294 if (rt->rt_gateway == NULL || 2295 rt->rt_gateway->sa_family != AF_INET6) { 2296 nd6log((LOG_ERR, 2297 "ICMP6 redirect rejected; no route " 2298 "with inet6 gateway found for redirect dst: %s\n", 2299 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2300 RTFREE_LOCKED(rt); 2301 goto bad; 2302 } 2303 2304 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr); 2305 if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) { 2306 nd6log((LOG_ERR, 2307 "ICMP6 redirect rejected; " 2308 "not equal to gw-for-src=%s (must be same): " 2309 "%s\n", 2310 ip6_sprintf(gw6), 2311 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2312 RTFREE_LOCKED(rt); 2313 goto bad; 2314 } 2315 } else { 2316 nd6log((LOG_ERR, 2317 "ICMP6 redirect rejected; " 2318 "no route found for redirect dst: %s\n", 2319 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2320 goto bad; 2321 } 2322 RTFREE_LOCKED(rt); 2323 rt = NULL; 2324 } 2325 if (IN6_IS_ADDR_MULTICAST(&reddst6)) { 2326 nd6log((LOG_ERR, 2327 "ICMP6 redirect rejected; " 2328 "redirect dst must be unicast: %s\n", 2329 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2330 goto bad; 2331 } 2332 2333 is_router = is_onlink = 0; 2334 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 2335 is_router = 1; /* router case */ 2336 if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0) 2337 is_onlink = 1; /* on-link destination case */ 2338 if (!is_router && !is_onlink) { 2339 nd6log((LOG_ERR, 2340 "ICMP6 redirect rejected; " 2341 "neither router case nor onlink case: %s\n", 2342 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2343 goto bad; 2344 } 2345 /* validation passed */ 2346 2347 icmp6len -= sizeof(*nd_rd); 2348 nd6_option_init(nd_rd + 1, icmp6len, &ndopts); 2349 if (nd6_options(&ndopts) < 0) { 2350 nd6log((LOG_INFO, "icmp6_redirect_input: " 2351 "invalid ND option, rejected: %s\n", 2352 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2353 /* nd6_options have incremented stats */ 2354 goto freeit; 2355 } 2356 2357 if (ndopts.nd_opts_tgt_lladdr) { 2358 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 2359 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 2360 } 2361 2362 if (ndopts.nd_opts_rh) { 2363 redirhdrlen = ndopts.nd_opts_rh->nd_opt_rh_len; 2364 redirhdr = (u_char *)(ndopts.nd_opts_rh + 1); /* xxx */ 2365 } 2366 2367 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 2368 nd6log((LOG_INFO, 2369 "icmp6_redirect_input: lladdrlen mismatch for %s " 2370 "(if %d, icmp6 packet %d): %s\n", 2371 ip6_sprintf(&redtgt6), ifp->if_addrlen, lladdrlen - 2, 2372 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2373 goto bad; 2374 } 2375 2376 /* RFC 2461 8.3 */ 2377 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT, 2378 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER); 2379 2380 if (!is_onlink) { /* better router case. perform rtredirect. */ 2381 /* perform rtredirect */ 2382 struct sockaddr_in6 sdst; 2383 struct sockaddr_in6 sgw; 2384 struct sockaddr_in6 ssrc; 2385 2386 bzero(&sdst, sizeof(sdst)); 2387 bzero(&sgw, sizeof(sgw)); 2388 bzero(&ssrc, sizeof(ssrc)); 2389 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6; 2390 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len = 2391 sizeof(struct sockaddr_in6); 2392 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr)); 2393 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2394 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr)); 2395 rtredirect((struct sockaddr *)&sdst, (struct sockaddr *)&sgw, 2396 (struct sockaddr *)NULL, RTF_GATEWAY | RTF_HOST, 2397 (struct sockaddr *)&ssrc); 2398 } 2399 /* finally update cached route in each socket via pfctlinput */ 2400 { 2401 struct sockaddr_in6 sdst; 2402 2403 bzero(&sdst, sizeof(sdst)); 2404 sdst.sin6_family = AF_INET6; 2405 sdst.sin6_len = sizeof(struct sockaddr_in6); 2406 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2407 pfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst); 2408#ifdef IPSEC 2409 key_sa_routechange((struct sockaddr *)&sdst); 2410#endif 2411 } 2412 2413 freeit: 2414 m_freem(m); 2415 return; 2416 2417 bad: 2418 icmp6stat.icp6s_badredirect++; 2419 m_freem(m); 2420} 2421 2422void 2423icmp6_redirect_output(m0, rt) 2424 struct mbuf *m0; 2425 struct rtentry *rt; 2426{ 2427 struct ifnet *ifp; /* my outgoing interface */ 2428 struct in6_addr *ifp_ll6; 2429 struct in6_addr *router_ll6; 2430 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */ 2431 struct mbuf *m = NULL; /* newly allocated one */ 2432 struct ip6_hdr *ip6; /* m as struct ip6_hdr */ 2433 struct nd_redirect *nd_rd; 2434 size_t maxlen; 2435 u_char *p; 2436 struct ifnet *outif = NULL; 2437 struct sockaddr_in6 src_sa; 2438 2439 icmp6_errcount(&icmp6stat.icp6s_outerrhist, ND_REDIRECT, 0); 2440 2441 /* if we are not router, we don't send icmp6 redirect */ 2442 if (!ip6_forwarding || ip6_accept_rtadv) 2443 goto fail; 2444 2445 /* sanity check */ 2446 if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp)) 2447 goto fail; 2448 2449 /* 2450 * Address check: 2451 * the source address must identify a neighbor, and 2452 * the destination address must not be a multicast address 2453 * [RFC 2461, sec 8.2] 2454 */ 2455 sip6 = mtod(m0, struct ip6_hdr *); 2456 bzero(&src_sa, sizeof(src_sa)); 2457 src_sa.sin6_family = AF_INET6; 2458 src_sa.sin6_len = sizeof(src_sa); 2459 src_sa.sin6_addr = sip6->ip6_src; 2460 /* we don't currently use sin6_scope_id, but eventually use it */ 2461 src_sa.sin6_scope_id = in6_addr2scopeid(ifp, &sip6->ip6_src); 2462 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0) 2463 goto fail; 2464 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst)) 2465 goto fail; /* what should we do here? */ 2466 2467 /* rate limit */ 2468 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0)) 2469 goto fail; 2470 2471 /* 2472 * Since we are going to append up to 1280 bytes (= IPV6_MMTU), 2473 * we almost always ask for an mbuf cluster for simplicity. 2474 * (MHLEN < IPV6_MMTU is almost always true) 2475 */ 2476#if IPV6_MMTU >= MCLBYTES 2477# error assumption failed about IPV6_MMTU and MCLBYTES 2478#endif 2479 MGETHDR(m, M_DONTWAIT, MT_HEADER); 2480 if (m && IPV6_MMTU >= MHLEN) 2481 MCLGET(m, M_DONTWAIT); 2482 if (!m) 2483 goto fail; 2484 m->m_pkthdr.rcvif = NULL; 2485 m->m_len = 0; 2486 maxlen = M_TRAILINGSPACE(m); 2487 maxlen = min(IPV6_MMTU, maxlen); 2488 /* just for safety */ 2489 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) + 2490 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) { 2491 goto fail; 2492 } 2493 2494 { 2495 /* get ip6 linklocal address for ifp(my outgoing interface). */ 2496 struct in6_ifaddr *ia; 2497 if ((ia = in6ifa_ifpforlinklocal(ifp, 2498 IN6_IFF_NOTREADY| 2499 IN6_IFF_ANYCAST)) == NULL) 2500 goto fail; 2501 ifp_ll6 = &ia->ia_addr.sin6_addr; 2502 } 2503 2504 /* get ip6 linklocal address for the router. */ 2505 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) { 2506 struct sockaddr_in6 *sin6; 2507 sin6 = (struct sockaddr_in6 *)rt->rt_gateway; 2508 router_ll6 = &sin6->sin6_addr; 2509 if (!IN6_IS_ADDR_LINKLOCAL(router_ll6)) 2510 router_ll6 = (struct in6_addr *)NULL; 2511 } else 2512 router_ll6 = (struct in6_addr *)NULL; 2513 2514 /* ip6 */ 2515 ip6 = mtod(m, struct ip6_hdr *); 2516 ip6->ip6_flow = 0; 2517 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2518 ip6->ip6_vfc |= IPV6_VERSION; 2519 /* ip6->ip6_plen will be set later */ 2520 ip6->ip6_nxt = IPPROTO_ICMPV6; 2521 ip6->ip6_hlim = 255; 2522 /* ip6->ip6_src must be linklocal addr for my outgoing if. */ 2523 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr)); 2524 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr)); 2525 2526 /* ND Redirect */ 2527 nd_rd = (struct nd_redirect *)(ip6 + 1); 2528 nd_rd->nd_rd_type = ND_REDIRECT; 2529 nd_rd->nd_rd_code = 0; 2530 nd_rd->nd_rd_reserved = 0; 2531 if (rt->rt_flags & RTF_GATEWAY) { 2532 /* 2533 * nd_rd->nd_rd_target must be a link-local address in 2534 * better router cases. 2535 */ 2536 if (!router_ll6) 2537 goto fail; 2538 bcopy(router_ll6, &nd_rd->nd_rd_target, 2539 sizeof(nd_rd->nd_rd_target)); 2540 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2541 sizeof(nd_rd->nd_rd_dst)); 2542 } else { 2543 /* make sure redtgt == reddst */ 2544 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target, 2545 sizeof(nd_rd->nd_rd_target)); 2546 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2547 sizeof(nd_rd->nd_rd_dst)); 2548 } 2549 2550 p = (u_char *)(nd_rd + 1); 2551 2552 if (!router_ll6) 2553 goto nolladdropt; 2554 2555 { 2556 /* target lladdr option */ 2557 struct rtentry *rt_router = NULL; 2558 int len; 2559 struct sockaddr_dl *sdl; 2560 struct nd_opt_hdr *nd_opt; 2561 char *lladdr; 2562 2563 rt_router = nd6_lookup(router_ll6, 0, ifp); 2564 if (!rt_router) 2565 goto nolladdropt; 2566 len = sizeof(*nd_opt) + ifp->if_addrlen; 2567 len = (len + 7) & ~7; /* round by 8 */ 2568 /* safety check */ 2569 if (len + (p - (u_char *)ip6) > maxlen) 2570 goto nolladdropt; 2571 if (!(rt_router->rt_flags & RTF_GATEWAY) && 2572 (rt_router->rt_flags & RTF_LLINFO) && 2573 (rt_router->rt_gateway->sa_family == AF_LINK) && 2574 (sdl = (struct sockaddr_dl *)rt_router->rt_gateway) && 2575 sdl->sdl_alen) { 2576 nd_opt = (struct nd_opt_hdr *)p; 2577 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 2578 nd_opt->nd_opt_len = len >> 3; 2579 lladdr = (char *)(nd_opt + 1); 2580 bcopy(LLADDR(sdl), lladdr, ifp->if_addrlen); 2581 p += len; 2582 } 2583 } 2584nolladdropt:; 2585 2586 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2587 2588 /* just to be safe */ 2589#ifdef M_DECRYPTED /*not openbsd*/ 2590 if (m0->m_flags & M_DECRYPTED) 2591 goto noredhdropt; 2592#endif 2593 if (p - (u_char *)ip6 > maxlen) 2594 goto noredhdropt; 2595 2596 { 2597 /* redirected header option */ 2598 int len; 2599 struct nd_opt_rd_hdr *nd_opt_rh; 2600 2601 /* 2602 * compute the maximum size for icmp6 redirect header option. 2603 * XXX room for auth header? 2604 */ 2605 len = maxlen - (p - (u_char *)ip6); 2606 len &= ~7; 2607 2608 /* This is just for simplicity. */ 2609 if (m0->m_pkthdr.len != m0->m_len) { 2610 if (m0->m_next) { 2611 m_freem(m0->m_next); 2612 m0->m_next = NULL; 2613 } 2614 m0->m_pkthdr.len = m0->m_len; 2615 } 2616 2617 /* 2618 * Redirected header option spec (RFC2461 4.6.3) talks nothing 2619 * about padding/truncate rule for the original IP packet. 2620 * From the discussion on IPv6imp in Feb 1999, the consensus was: 2621 * - "attach as much as possible" is the goal 2622 * - pad if not aligned (original size can be guessed by original 2623 * ip6 header) 2624 * Following code adds the padding if it is simple enough, 2625 * and truncates if not. 2626 */ 2627 if (m0->m_next || m0->m_pkthdr.len != m0->m_len) 2628 panic("assumption failed in %s:%d", __FILE__, __LINE__); 2629 2630 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) { 2631 /* not enough room, truncate */ 2632 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh); 2633 } else { 2634 /* enough room, pad or truncate */ 2635 size_t extra; 2636 2637 extra = m0->m_pkthdr.len % 8; 2638 if (extra) { 2639 /* pad if easy enough, truncate if not */ 2640 if (8 - extra <= M_TRAILINGSPACE(m0)) { 2641 /* pad */ 2642 m0->m_len += (8 - extra); 2643 m0->m_pkthdr.len += (8 - extra); 2644 } else { 2645 /* truncate */ 2646 m0->m_pkthdr.len -= extra; 2647 m0->m_len -= extra; 2648 } 2649 } 2650 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh); 2651 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh); 2652 } 2653 2654 nd_opt_rh = (struct nd_opt_rd_hdr *)p; 2655 bzero(nd_opt_rh, sizeof(*nd_opt_rh)); 2656 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER; 2657 nd_opt_rh->nd_opt_rh_len = len >> 3; 2658 p += sizeof(*nd_opt_rh); 2659 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2660 2661 /* connect m0 to m */ 2662 m_tag_delete_chain(m0, NULL); 2663 m0->m_flags &= ~M_PKTHDR; 2664 m->m_next = m0; 2665 m->m_pkthdr.len = m->m_len + m0->m_len; 2666 m0 = NULL; 2667 } 2668noredhdropt:; 2669 if (m0) { 2670 m_freem(m0); 2671 m0 = NULL; 2672 } 2673 2674 if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_src)) 2675 sip6->ip6_src.s6_addr16[1] = 0; 2676 if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_dst)) 2677 sip6->ip6_dst.s6_addr16[1] = 0; 2678#if 0 2679 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src)) 2680 ip6->ip6_src.s6_addr16[1] = 0; 2681 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) 2682 ip6->ip6_dst.s6_addr16[1] = 0; 2683#endif 2684 if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_target)) 2685 nd_rd->nd_rd_target.s6_addr16[1] = 0; 2686 if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_dst)) 2687 nd_rd->nd_rd_dst.s6_addr16[1] = 0; 2688 2689 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 2690 2691 nd_rd->nd_rd_cksum = 0; 2692 nd_rd->nd_rd_cksum 2693 = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen)); 2694 2695 /* send the packet to outside... */ 2696 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL); 2697 if (outif) { 2698 icmp6_ifstat_inc(outif, ifs6_out_msg); 2699 icmp6_ifstat_inc(outif, ifs6_out_redirect); 2700 } 2701 icmp6stat.icp6s_outhist[ND_REDIRECT]++; 2702 2703 return; 2704 2705fail: 2706 if (m) 2707 m_freem(m); 2708 if (m0) 2709 m_freem(m0); 2710} 2711 2712#ifdef HAVE_NRL_INPCB 2713#define sotoin6pcb sotoinpcb 2714#define in6pcb inpcb 2715#define in6p_icmp6filt inp_icmp6filt 2716#endif 2717/* 2718 * ICMPv6 socket option processing. 2719 */ 2720int 2721icmp6_ctloutput(so, sopt) 2722 struct socket *so; 2723 struct sockopt *sopt; 2724{ 2725 int error = 0; 2726 int optlen; 2727 struct inpcb *inp = sotoinpcb(so); 2728 int level, op, optname; 2729 2730 if (sopt) { 2731 level = sopt->sopt_level; 2732 op = sopt->sopt_dir; 2733 optname = sopt->sopt_name; 2734 optlen = sopt->sopt_valsize; 2735 } else 2736 level = op = optname = optlen = 0; 2737 2738 if (level != IPPROTO_ICMPV6) { 2739 return EINVAL; 2740 } 2741 2742 switch (op) { 2743 case PRCO_SETOPT: 2744 switch (optname) { 2745 case ICMP6_FILTER: 2746 { 2747 struct icmp6_filter *p; 2748 2749 if (optlen != sizeof(*p)) { 2750 error = EMSGSIZE; 2751 break; 2752 } 2753 if (inp->in6p_icmp6filt == NULL) { 2754 error = EINVAL; 2755 break; 2756 } 2757 error = sooptcopyin(sopt, inp->in6p_icmp6filt, optlen, 2758 optlen); 2759 break; 2760 } 2761 2762 default: 2763 error = ENOPROTOOPT; 2764 break; 2765 } 2766 break; 2767 2768 case PRCO_GETOPT: 2769 switch (optname) { 2770 case ICMP6_FILTER: 2771 { 2772 if (inp->in6p_icmp6filt == NULL) { 2773 error = EINVAL; 2774 break; 2775 } 2776 error = sooptcopyout(sopt, inp->in6p_icmp6filt, 2777 sizeof(struct icmp6_filter)); 2778 break; 2779 } 2780 2781 default: 2782 error = ENOPROTOOPT; 2783 break; 2784 } 2785 break; 2786 } 2787 2788 return(error); 2789} 2790#ifdef HAVE_NRL_INPCB 2791#undef sotoin6pcb 2792#undef in6pcb 2793#undef in6p_icmp6filt 2794#endif 2795 2796#ifndef HAVE_PPSRATECHECK 2797#ifndef timersub 2798#define timersub(tvp, uvp, vvp) \ 2799 do { \ 2800 (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec; \ 2801 (vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec; \ 2802 if ((vvp)->tv_usec < 0) { \ 2803 (vvp)->tv_sec--; \ 2804 (vvp)->tv_usec += 1000000; \ 2805 } \ 2806 } while (0) 2807#endif 2808 2809/* 2810 * ppsratecheck(): packets (or events) per second limitation. 2811 */ 2812static int 2813ppsratecheck(lasttime, curpps, maxpps) 2814 struct timeval *lasttime; 2815 int *curpps; 2816 int maxpps; /* maximum pps allowed */ 2817{ 2818 struct timeval tv, delta; 2819 int s, rv; 2820 2821 s = splclock(); 2822 microtime(&tv); 2823 splx(s); 2824 2825 timersub(&tv, lasttime, &delta); 2826 2827 /* 2828 * Check for 0,0 so that the message will be seen at least once. 2829 * If more than one second has passed since the last update of 2830 * lasttime, reset the counter. 2831 * 2832 * We do increment *curpps even in *curpps < maxpps case, as some may 2833 * try to use *curpps for stat purposes as well. 2834 */ 2835 if ((lasttime->tv_sec == 0 && lasttime->tv_usec == 0) || 2836 delta.tv_sec >= 1) { 2837 *lasttime = tv; 2838 *curpps = 0; 2839 rv = 1; 2840 } else if (maxpps < 0) 2841 rv = 1; 2842 else if (*curpps < maxpps) 2843 rv = 1; 2844 else 2845 rv = 0; 2846 2847#if 1 /* DIAGNOSTIC? */ 2848 /* be careful about wrap-around */ 2849 if (*curpps + 1 > *curpps) 2850 *curpps = *curpps + 1; 2851#else 2852 /* 2853 * assume that there's not too many calls to this function. 2854 * not sure if the assumption holds, as it depends on *caller's* 2855 * behavior, not the behavior of this function. 2856 * IMHO it is wrong to make assumption on the caller's behavior, 2857 * so the above #if is #if 1, not #ifdef DIAGNOSTIC. 2858 */ 2859 *curpps = *curpps + 1; 2860#endif 2861 2862 return (rv); 2863} 2864#endif 2865 2866/* 2867 * Perform rate limit check. 2868 * Returns 0 if it is okay to send the icmp6 packet. 2869 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate 2870 * limitation. 2871 * 2872 * XXX per-destination/type check necessary? 2873 */ 2874static int 2875icmp6_ratelimit(dst, type, code) 2876 const struct in6_addr *dst; /* not used at this moment */ 2877 const int type; /* not used at this moment */ 2878 const int code; /* not used at this moment */ 2879{ 2880 int ret; 2881 2882 ret = 0; /* okay to send */ 2883 2884 /* PPS limit */ 2885 if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count, 2886 icmp6errppslim)) { 2887 /* The packet is subject to rate limit */ 2888 ret++; 2889 } 2890 2891 return ret; 2892} 2893