icmp6.c revision 120892
1/* $FreeBSD: head/sys/netinet6/icmp6.c 120892 2003-10-07 19:51:22Z ume $ */ 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 defined. */ 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), -1); 891 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 892#else 893 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 894 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 895 if (icmp6 == NULL) { 896 icmp6stat.icp6s_tooshort++; 897 return (-1); 898 } 899#endif 900 eip6 = (struct ip6_hdr *)(icmp6 + 1); 901 902 /* Detect the upper level protocol */ 903 { 904 void (*ctlfunc) __P((int, struct sockaddr *, void *)); 905 u_int8_t nxt = eip6->ip6_nxt; 906 int eoff = off + sizeof(struct icmp6_hdr) + 907 sizeof(struct ip6_hdr); 908 struct ip6ctlparam ip6cp; 909 struct in6_addr *finaldst = NULL; 910 int icmp6type = icmp6->icmp6_type; 911 struct ip6_frag *fh; 912 struct ip6_rthdr *rth; 913 struct ip6_rthdr0 *rth0; 914 int rthlen; 915 916 while (1) { /* XXX: should avoid infinite loop explicitly? */ 917 struct ip6_ext *eh; 918 919 switch (nxt) { 920 case IPPROTO_HOPOPTS: 921 case IPPROTO_DSTOPTS: 922 case IPPROTO_AH: 923#ifndef PULLDOWN_TEST 924 IP6_EXTHDR_CHECK(m, 0, 925 eoff + sizeof(struct ip6_ext), -1); 926 eh = (struct ip6_ext *)(mtod(m, caddr_t) + eoff); 927#else 928 IP6_EXTHDR_GET(eh, struct ip6_ext *, m, 929 eoff, sizeof(*eh)); 930 if (eh == NULL) { 931 icmp6stat.icp6s_tooshort++; 932 return (-1); 933 } 934#endif 935 936 if (nxt == IPPROTO_AH) 937 eoff += (eh->ip6e_len + 2) << 2; 938 else 939 eoff += (eh->ip6e_len + 1) << 3; 940 nxt = eh->ip6e_nxt; 941 break; 942 case IPPROTO_ROUTING: 943 /* 944 * When the erroneous packet contains a 945 * routing header, we should examine the 946 * header to determine the final destination. 947 * Otherwise, we can't properly update 948 * information that depends on the final 949 * destination (e.g. path MTU). 950 */ 951#ifndef PULLDOWN_TEST 952 IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(*rth), -1); 953 rth = (struct ip6_rthdr *) 954 (mtod(m, caddr_t) + eoff); 955#else 956 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m, 957 eoff, sizeof(*rth)); 958 if (rth == NULL) { 959 icmp6stat.icp6s_tooshort++; 960 return (-1); 961 } 962#endif 963 rthlen = (rth->ip6r_len + 1) << 3; 964 /* 965 * XXX: currently there is no 966 * officially defined type other 967 * than type-0. 968 * Note that if the segment left field 969 * is 0, all intermediate hops must 970 * have been passed. 971 */ 972 if (rth->ip6r_segleft && 973 rth->ip6r_type == IPV6_RTHDR_TYPE_0) { 974 int hops; 975 976#ifndef PULLDOWN_TEST 977 IP6_EXTHDR_CHECK(m, 0, eoff + rthlen, -1); 978 rth0 = (struct ip6_rthdr0 *) 979 (mtod(m, caddr_t) + eoff); 980#else 981 IP6_EXTHDR_GET(rth0, 982 struct ip6_rthdr0 *, m, 983 eoff, rthlen); 984 if (rth0 == NULL) { 985 icmp6stat.icp6s_tooshort++; 986 return (-1); 987 } 988#endif 989 /* just ignore a bogus header */ 990 if ((rth0->ip6r0_len % 2) == 0 && 991 (hops = rth0->ip6r0_len/2)) 992 finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1); 993 } 994 eoff += rthlen; 995 nxt = rth->ip6r_nxt; 996 break; 997 case IPPROTO_FRAGMENT: 998#ifndef PULLDOWN_TEST 999 IP6_EXTHDR_CHECK(m, 0, eoff + 1000 sizeof(struct ip6_frag), -1); 1001 fh = (struct ip6_frag *)(mtod(m, caddr_t) + 1002 eoff); 1003#else 1004 IP6_EXTHDR_GET(fh, struct ip6_frag *, m, 1005 eoff, sizeof(*fh)); 1006 if (fh == NULL) { 1007 icmp6stat.icp6s_tooshort++; 1008 return (-1); 1009 } 1010#endif 1011 /* 1012 * Data after a fragment header is meaningless 1013 * unless it is the first fragment, but 1014 * we'll go to the notify label for path MTU 1015 * discovery. 1016 */ 1017 if (fh->ip6f_offlg & IP6F_OFF_MASK) 1018 goto notify; 1019 1020 eoff += sizeof(struct ip6_frag); 1021 nxt = fh->ip6f_nxt; 1022 break; 1023 default: 1024 /* 1025 * This case includes ESP and the No Next 1026 * Header. In such cases going to the notify 1027 * label does not have any meaning 1028 * (i.e. ctlfunc will be NULL), but we go 1029 * anyway since we might have to update 1030 * path MTU information. 1031 */ 1032 goto notify; 1033 } 1034 } 1035 notify: 1036#ifndef PULLDOWN_TEST 1037 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 1038#else 1039 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 1040 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 1041 if (icmp6 == NULL) { 1042 icmp6stat.icp6s_tooshort++; 1043 return (-1); 1044 } 1045#endif 1046 1047 /* 1048 * retrieve parameters from the inner IPv6 header, and convert 1049 * them into sockaddr structures. 1050 * XXX: there is no guarantee that the source or destination 1051 * addresses of the inner packet are in the same scope as 1052 * the addresses of the icmp packet. But there is no other 1053 * way to determine the zone. 1054 */ 1055 eip6 = (struct ip6_hdr *)(icmp6 + 1); 1056 1057 bzero(&icmp6dst, sizeof(icmp6dst)); 1058 icmp6dst.sin6_len = sizeof(struct sockaddr_in6); 1059 icmp6dst.sin6_family = AF_INET6; 1060 if (finaldst == NULL) 1061 icmp6dst.sin6_addr = eip6->ip6_dst; 1062 else 1063 icmp6dst.sin6_addr = *finaldst; 1064 icmp6dst.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif, 1065 &icmp6dst.sin6_addr); 1066#ifndef SCOPEDROUTING 1067 if (in6_embedscope(&icmp6dst.sin6_addr, &icmp6dst, 1068 NULL, NULL)) { 1069 /* should be impossbile */ 1070 nd6log((LOG_DEBUG, 1071 "icmp6_notify_error: in6_embedscope failed\n")); 1072 goto freeit; 1073 } 1074#endif 1075 1076 /* 1077 * retrieve parameters from the inner IPv6 header, and convert 1078 * them into sockaddr structures. 1079 */ 1080 bzero(&icmp6src, sizeof(icmp6src)); 1081 icmp6src.sin6_len = sizeof(struct sockaddr_in6); 1082 icmp6src.sin6_family = AF_INET6; 1083 icmp6src.sin6_addr = eip6->ip6_src; 1084 icmp6src.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif, 1085 &icmp6src.sin6_addr); 1086#ifndef SCOPEDROUTING 1087 if (in6_embedscope(&icmp6src.sin6_addr, &icmp6src, 1088 NULL, NULL)) { 1089 /* should be impossbile */ 1090 nd6log((LOG_DEBUG, 1091 "icmp6_notify_error: in6_embedscope failed\n")); 1092 goto freeit; 1093 } 1094#endif 1095 icmp6src.sin6_flowinfo = (eip6->ip6_flow & IPV6_FLOWLABEL_MASK); 1096 1097 if (finaldst == NULL) 1098 finaldst = &eip6->ip6_dst; 1099 ip6cp.ip6c_m = m; 1100 ip6cp.ip6c_icmp6 = icmp6; 1101 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1); 1102 ip6cp.ip6c_off = eoff; 1103 ip6cp.ip6c_finaldst = finaldst; 1104 ip6cp.ip6c_src = &icmp6src; 1105 ip6cp.ip6c_nxt = nxt; 1106 1107 if (icmp6type == ICMP6_PACKET_TOO_BIG) { 1108 notifymtu = ntohl(icmp6->icmp6_mtu); 1109 ip6cp.ip6c_cmdarg = (void *)¬ifymtu; 1110 icmp6_mtudisc_update(&ip6cp, 1); /*XXX*/ 1111 } 1112 1113 ctlfunc = (void (*) __P((int, struct sockaddr *, void *))) 1114 (inet6sw[ip6_protox[nxt]].pr_ctlinput); 1115 if (ctlfunc) { 1116 (void) (*ctlfunc)(code, (struct sockaddr *)&icmp6dst, 1117 &ip6cp); 1118 } 1119 } 1120 return (0); 1121 1122 freeit: 1123 m_freem(m); 1124 return (-1); 1125} 1126 1127void 1128icmp6_mtudisc_update(ip6cp, validated) 1129 struct ip6ctlparam *ip6cp; 1130 int validated; 1131{ 1132 struct in6_addr *dst = ip6cp->ip6c_finaldst; 1133 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6; 1134 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */ 1135 u_int mtu = ntohl(icmp6->icmp6_mtu); 1136 struct rtentry *rt = NULL; 1137 struct sockaddr_in6 sin6; 1138 1139 if (!validated) 1140 return; 1141 1142 bzero(&sin6, sizeof(sin6)); 1143 sin6.sin6_family = PF_INET6; 1144 sin6.sin6_len = sizeof(struct sockaddr_in6); 1145 sin6.sin6_addr = *dst; 1146 /* XXX normally, this won't happen */ 1147 if (IN6_IS_ADDR_LINKLOCAL(dst)) { 1148 sin6.sin6_addr.s6_addr16[1] = 1149 htons(m->m_pkthdr.rcvif->if_index); 1150 } 1151 /* sin6.sin6_scope_id = XXX: should be set if DST is a scoped addr */ 1152 rt = rtalloc1((struct sockaddr *)&sin6, 0, 1153 RTF_CLONING | RTF_PRCLONING); 1154 1155 if (rt && (rt->rt_flags & RTF_HOST) && 1156 !(rt->rt_rmx.rmx_locks & RTV_MTU)) { 1157 if (mtu < IPV6_MMTU) { 1158 /* xxx */ 1159 rt->rt_rmx.rmx_locks |= RTV_MTU; 1160 } else if (mtu < rt->rt_ifp->if_mtu && 1161 rt->rt_rmx.rmx_mtu > mtu) { 1162 icmp6stat.icp6s_pmtuchg++; 1163 rt->rt_rmx.rmx_mtu = mtu; 1164 } 1165 } 1166 if (rt) 1167 rtfree(rt); 1168} 1169 1170/* 1171 * Process a Node Information Query packet, based on 1172 * draft-ietf-ipngwg-icmp-name-lookups-07. 1173 * 1174 * Spec incompatibilities: 1175 * - IPv6 Subject address handling 1176 * - IPv4 Subject address handling support missing 1177 * - Proxy reply (answer even if it's not for me) 1178 * - joins NI group address at in6_ifattach() time only, does not cope 1179 * with hostname changes by sethostname(3) 1180 */ 1181#define hostnamelen strlen(hostname) 1182static struct mbuf * 1183ni6_input(m, off) 1184 struct mbuf *m; 1185 int off; 1186{ 1187 struct icmp6_nodeinfo *ni6, *nni6; 1188 struct mbuf *n = NULL; 1189 u_int16_t qtype; 1190 int subjlen; 1191 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1192 struct ni_reply_fqdn *fqdn; 1193 int addrs; /* for NI_QTYPE_NODEADDR */ 1194 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */ 1195 struct sockaddr_in6 sin6; /* double meaning; ip6_dst and subjectaddr */ 1196 struct sockaddr_in6 sin6_d; /* XXX: we should retrieve this from m_aux */ 1197 struct ip6_hdr *ip6; 1198 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */ 1199 char *subj = NULL; 1200 struct in6_ifaddr *ia6 = NULL; 1201 1202 ip6 = mtod(m, struct ip6_hdr *); 1203#ifndef PULLDOWN_TEST 1204 ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off); 1205#else 1206 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6)); 1207 if (ni6 == NULL) { 1208 /* m is already reclaimed */ 1209 return (NULL); 1210 } 1211#endif 1212 1213 /* 1214 * Validate IPv6 destination address. 1215 * 1216 * The Responder must discard the Query without further processing 1217 * unless it is one of the Responder's unicast or anycast addresses, or 1218 * a link-local scope multicast address which the Responder has joined. 1219 * [icmp-name-lookups-07, Section 4.] 1220 */ 1221 bzero(&sin6, sizeof(sin6)); 1222 sin6.sin6_family = AF_INET6; 1223 sin6.sin6_len = sizeof(struct sockaddr_in6); 1224 bcopy(&ip6->ip6_dst, &sin6.sin6_addr, sizeof(sin6.sin6_addr)); 1225 /* XXX scopeid */ 1226 if ((ia6 = (struct in6_ifaddr *)ifa_ifwithaddr((struct sockaddr *)&sin6)) != NULL) { 1227 /* unicast/anycast, fine */ 1228 if ((ia6->ia6_flags & IN6_IFF_TEMPORARY) != 0 && 1229 (icmp6_nodeinfo & 4) == 0) { 1230 nd6log((LOG_DEBUG, "ni6_input: ignore node info to " 1231 "a temporary address in %s:%d", 1232 __FILE__, __LINE__)); 1233 goto bad; 1234 } 1235 } else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr)) 1236 ; /* link-local multicast, fine */ 1237 else 1238 goto bad; 1239 1240 /* validate query Subject field. */ 1241 qtype = ntohs(ni6->ni_qtype); 1242 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo); 1243 switch (qtype) { 1244 case NI_QTYPE_NOOP: 1245 case NI_QTYPE_SUPTYPES: 1246 /* 07 draft */ 1247 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0) 1248 break; 1249 /* FALLTHROUGH */ 1250 case NI_QTYPE_FQDN: 1251 case NI_QTYPE_NODEADDR: 1252 switch (ni6->ni_code) { 1253 case ICMP6_NI_SUBJ_IPV6: 1254#if ICMP6_NI_SUBJ_IPV6 != 0 1255 case 0: 1256#endif 1257 /* 1258 * backward compatibility - try to accept 03 draft 1259 * format, where no Subject is present. 1260 */ 1261 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 && 1262 subjlen == 0) { 1263 oldfqdn++; 1264 break; 1265 } 1266#if ICMP6_NI_SUBJ_IPV6 != 0 1267 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6) 1268 goto bad; 1269#endif 1270 1271 if (subjlen != sizeof(sin6.sin6_addr)) 1272 goto bad; 1273 1274 /* 1275 * Validate Subject address. 1276 * 1277 * Not sure what exactly "address belongs to the node" 1278 * means in the spec, is it just unicast, or what? 1279 * 1280 * At this moment we consider Subject address as 1281 * "belong to the node" if the Subject address equals 1282 * to the IPv6 destination address; validation for 1283 * IPv6 destination address should have done enough 1284 * check for us. 1285 * 1286 * We do not do proxy at this moment. 1287 */ 1288 /* m_pulldown instead of copy? */ 1289 m_copydata(m, off + sizeof(struct icmp6_nodeinfo), 1290 subjlen, (caddr_t)&sin6.sin6_addr); 1291 sin6.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif, 1292 &sin6.sin6_addr); 1293#ifndef SCOPEDROUTING 1294 in6_embedscope(&sin6.sin6_addr, &sin6, NULL, NULL); 1295#endif 1296 bzero(&sin6_d, sizeof(sin6_d)); 1297 sin6_d.sin6_family = AF_INET6; /* not used, actually */ 1298 sin6_d.sin6_len = sizeof(sin6_d); /* ditto */ 1299 sin6_d.sin6_addr = ip6->ip6_dst; 1300 sin6_d.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif, 1301 &ip6->ip6_dst); 1302#ifndef SCOPEDROUTING 1303 in6_embedscope(&sin6_d.sin6_addr, &sin6_d, NULL, NULL); 1304#endif 1305 subj = (char *)&sin6; 1306 if (SA6_ARE_ADDR_EQUAL(&sin6, &sin6_d)) 1307 break; 1308 1309 /* 1310 * XXX if we are to allow other cases, we should really 1311 * be careful about scope here. 1312 * basically, we should disallow queries toward IPv6 1313 * destination X with subject Y, 1314 * if scope(X) > scope(Y). 1315 * if we allow scope(X) > scope(Y), it will result in 1316 * information leakage across scope boundary. 1317 */ 1318 goto bad; 1319 1320 case ICMP6_NI_SUBJ_FQDN: 1321 /* 1322 * Validate Subject name with gethostname(3). 1323 * 1324 * The behavior may need some debate, since: 1325 * - we are not sure if the node has FQDN as 1326 * hostname (returned by gethostname(3)). 1327 * - the code does wildcard match for truncated names. 1328 * however, we are not sure if we want to perform 1329 * wildcard match, if gethostname(3) side has 1330 * truncated hostname. 1331 */ 1332 n = ni6_nametodns(hostname, hostnamelen, 0); 1333 if (!n || n->m_next || n->m_len == 0) 1334 goto bad; 1335 IP6_EXTHDR_GET(subj, char *, m, 1336 off + sizeof(struct icmp6_nodeinfo), subjlen); 1337 if (subj == NULL) 1338 goto bad; 1339 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *), 1340 n->m_len)) { 1341 goto bad; 1342 } 1343 m_freem(n); 1344 n = NULL; 1345 break; 1346 1347 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */ 1348 default: 1349 goto bad; 1350 } 1351 break; 1352 } 1353 1354 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */ 1355 switch (qtype) { 1356 case NI_QTYPE_FQDN: 1357 if ((icmp6_nodeinfo & 1) == 0) 1358 goto bad; 1359 break; 1360 case NI_QTYPE_NODEADDR: 1361 if ((icmp6_nodeinfo & 2) == 0) 1362 goto bad; 1363 break; 1364 } 1365 1366 /* guess reply length */ 1367 switch (qtype) { 1368 case NI_QTYPE_NOOP: 1369 break; /* no reply data */ 1370 case NI_QTYPE_SUPTYPES: 1371 replylen += sizeof(u_int32_t); 1372 break; 1373 case NI_QTYPE_FQDN: 1374 /* XXX will append an mbuf */ 1375 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1376 break; 1377 case NI_QTYPE_NODEADDR: 1378 addrs = ni6_addrs(ni6, m, &ifp, subj); 1379 if ((replylen += addrs * (sizeof(struct in6_addr) + 1380 sizeof(u_int32_t))) > MCLBYTES) 1381 replylen = MCLBYTES; /* XXX: will truncate pkt later */ 1382 break; 1383 default: 1384 /* 1385 * XXX: We must return a reply with the ICMP6 code 1386 * `unknown Qtype' in this case. However we regard the case 1387 * as an FQDN query for backward compatibility. 1388 * Older versions set a random value to this field, 1389 * so it rarely varies in the defined qtypes. 1390 * But the mechanism is not reliable... 1391 * maybe we should obsolete older versions. 1392 */ 1393 qtype = NI_QTYPE_FQDN; 1394 /* XXX will append an mbuf */ 1395 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1396 oldfqdn++; 1397 break; 1398 } 1399 1400 /* allocate an mbuf to reply. */ 1401 MGETHDR(n, M_DONTWAIT, m->m_type); 1402 if (n == NULL) { 1403 m_freem(m); 1404 return (NULL); 1405 } 1406 M_MOVE_PKTHDR(n, m); /* just for recvif */ 1407 if (replylen > MHLEN) { 1408 if (replylen > MCLBYTES) { 1409 /* 1410 * XXX: should we try to allocate more? But MCLBYTES 1411 * is probably much larger than IPV6_MMTU... 1412 */ 1413 goto bad; 1414 } 1415 MCLGET(n, M_DONTWAIT); 1416 if ((n->m_flags & M_EXT) == 0) { 1417 goto bad; 1418 } 1419 } 1420 n->m_pkthdr.len = n->m_len = replylen; 1421 1422 /* copy mbuf header and IPv6 + Node Information base headers */ 1423 bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr)); 1424 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1); 1425 bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo)); 1426 1427 /* qtype dependent procedure */ 1428 switch (qtype) { 1429 case NI_QTYPE_NOOP: 1430 nni6->ni_code = ICMP6_NI_SUCCESS; 1431 nni6->ni_flags = 0; 1432 break; 1433 case NI_QTYPE_SUPTYPES: 1434 { 1435 u_int32_t v; 1436 nni6->ni_code = ICMP6_NI_SUCCESS; 1437 nni6->ni_flags = htons(0x0000); /* raw bitmap */ 1438 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */ 1439 v = (u_int32_t)htonl(0x0000000f); 1440 bcopy(&v, nni6 + 1, sizeof(u_int32_t)); 1441 break; 1442 } 1443 case NI_QTYPE_FQDN: 1444 nni6->ni_code = ICMP6_NI_SUCCESS; 1445 fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) + 1446 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo)); 1447 nni6->ni_flags = 0; /* XXX: meaningless TTL */ 1448 fqdn->ni_fqdn_ttl = 0; /* ditto. */ 1449 /* 1450 * XXX do we really have FQDN in variable "hostname"? 1451 */ 1452 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn); 1453 if (n->m_next == NULL) 1454 goto bad; 1455 /* XXX we assume that n->m_next is not a chain */ 1456 if (n->m_next->m_next != NULL) 1457 goto bad; 1458 n->m_pkthdr.len += n->m_next->m_len; 1459 break; 1460 case NI_QTYPE_NODEADDR: 1461 { 1462 int lenlim, copied; 1463 1464 nni6->ni_code = ICMP6_NI_SUCCESS; 1465 n->m_pkthdr.len = n->m_len = 1466 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1467 lenlim = M_TRAILINGSPACE(n); 1468 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim); 1469 /* XXX: reset mbuf length */ 1470 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 1471 sizeof(struct icmp6_nodeinfo) + copied; 1472 break; 1473 } 1474 default: 1475 break; /* XXX impossible! */ 1476 } 1477 1478 nni6->ni_type = ICMP6_NI_REPLY; 1479 m_freem(m); 1480 return (n); 1481 1482 bad: 1483 m_freem(m); 1484 if (n) 1485 m_freem(n); 1486 return (NULL); 1487} 1488#undef hostnamelen 1489 1490/* 1491 * make a mbuf with DNS-encoded string. no compression support. 1492 * 1493 * XXX names with less than 2 dots (like "foo" or "foo.section") will be 1494 * treated as truncated name (two \0 at the end). this is a wild guess. 1495 */ 1496static struct mbuf * 1497ni6_nametodns(name, namelen, old) 1498 const char *name; 1499 int namelen; 1500 int old; /* return pascal string if non-zero */ 1501{ 1502 struct mbuf *m; 1503 char *cp, *ep; 1504 const char *p, *q; 1505 int i, len, nterm; 1506 1507 if (old) 1508 len = namelen + 1; 1509 else 1510 len = MCLBYTES; 1511 1512 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */ 1513 MGET(m, M_DONTWAIT, MT_DATA); 1514 if (m && len > MLEN) { 1515 MCLGET(m, M_DONTWAIT); 1516 if ((m->m_flags & M_EXT) == 0) 1517 goto fail; 1518 } 1519 if (!m) 1520 goto fail; 1521 m->m_next = NULL; 1522 1523 if (old) { 1524 m->m_len = len; 1525 *mtod(m, char *) = namelen; 1526 bcopy(name, mtod(m, char *) + 1, namelen); 1527 return m; 1528 } else { 1529 m->m_len = 0; 1530 cp = mtod(m, char *); 1531 ep = mtod(m, char *) + M_TRAILINGSPACE(m); 1532 1533 /* if not certain about my name, return empty buffer */ 1534 if (namelen == 0) 1535 return m; 1536 1537 /* 1538 * guess if it looks like shortened hostname, or FQDN. 1539 * shortened hostname needs two trailing "\0". 1540 */ 1541 i = 0; 1542 for (p = name; p < name + namelen; p++) { 1543 if (*p && *p == '.') 1544 i++; 1545 } 1546 if (i < 2) 1547 nterm = 2; 1548 else 1549 nterm = 1; 1550 1551 p = name; 1552 while (cp < ep && p < name + namelen) { 1553 i = 0; 1554 for (q = p; q < name + namelen && *q && *q != '.'; q++) 1555 i++; 1556 /* result does not fit into mbuf */ 1557 if (cp + i + 1 >= ep) 1558 goto fail; 1559 /* 1560 * DNS label length restriction, RFC1035 page 8. 1561 * "i == 0" case is included here to avoid returning 1562 * 0-length label on "foo..bar". 1563 */ 1564 if (i <= 0 || i >= 64) 1565 goto fail; 1566 *cp++ = i; 1567 bcopy(p, cp, i); 1568 cp += i; 1569 p = q; 1570 if (p < name + namelen && *p == '.') 1571 p++; 1572 } 1573 /* termination */ 1574 if (cp + nterm >= ep) 1575 goto fail; 1576 while (nterm-- > 0) 1577 *cp++ = '\0'; 1578 m->m_len = cp - mtod(m, char *); 1579 return m; 1580 } 1581 1582 panic("should not reach here"); 1583 /* NOTREACHED */ 1584 1585 fail: 1586 if (m) 1587 m_freem(m); 1588 return NULL; 1589} 1590 1591/* 1592 * check if two DNS-encoded string matches. takes care of truncated 1593 * form (with \0\0 at the end). no compression support. 1594 * XXX upper/lowercase match (see RFC2065) 1595 */ 1596static int 1597ni6_dnsmatch(a, alen, b, blen) 1598 const char *a; 1599 int alen; 1600 const char *b; 1601 int blen; 1602{ 1603 const char *a0, *b0; 1604 int l; 1605 1606 /* simplest case - need validation? */ 1607 if (alen == blen && bcmp(a, b, alen) == 0) 1608 return 1; 1609 1610 a0 = a; 1611 b0 = b; 1612 1613 /* termination is mandatory */ 1614 if (alen < 2 || blen < 2) 1615 return 0; 1616 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0') 1617 return 0; 1618 alen--; 1619 blen--; 1620 1621 while (a - a0 < alen && b - b0 < blen) { 1622 if (a - a0 + 1 > alen || b - b0 + 1 > blen) 1623 return 0; 1624 1625 if ((signed char)a[0] < 0 || (signed char)b[0] < 0) 1626 return 0; 1627 /* we don't support compression yet */ 1628 if (a[0] >= 64 || b[0] >= 64) 1629 return 0; 1630 1631 /* truncated case */ 1632 if (a[0] == 0 && a - a0 == alen - 1) 1633 return 1; 1634 if (b[0] == 0 && b - b0 == blen - 1) 1635 return 1; 1636 if (a[0] == 0 || b[0] == 0) 1637 return 0; 1638 1639 if (a[0] != b[0]) 1640 return 0; 1641 l = a[0]; 1642 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen) 1643 return 0; 1644 if (bcmp(a + 1, b + 1, l) != 0) 1645 return 0; 1646 1647 a += 1 + l; 1648 b += 1 + l; 1649 } 1650 1651 if (a - a0 == alen && b - b0 == blen) 1652 return 1; 1653 else 1654 return 0; 1655} 1656 1657/* 1658 * calculate the number of addresses to be returned in the node info reply. 1659 */ 1660static int 1661ni6_addrs(ni6, m, ifpp, subj) 1662 struct icmp6_nodeinfo *ni6; 1663 struct mbuf *m; 1664 struct ifnet **ifpp; 1665 char *subj; 1666{ 1667 struct ifnet *ifp; 1668 struct in6_ifaddr *ifa6; 1669 struct ifaddr *ifa; 1670 struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */ 1671 int addrs = 0, addrsofif, iffound = 0; 1672 int niflags = ni6->ni_flags; 1673 1674 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) { 1675 switch (ni6->ni_code) { 1676 case ICMP6_NI_SUBJ_IPV6: 1677 if (subj == NULL) /* must be impossible... */ 1678 return (0); 1679 subj_ip6 = (struct sockaddr_in6 *)subj; 1680 break; 1681 default: 1682 /* 1683 * XXX: we only support IPv6 subject address for 1684 * this Qtype. 1685 */ 1686 return (0); 1687 } 1688 } 1689 1690 IFNET_RLOCK(); 1691 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) { 1692 addrsofif = 0; 1693 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 1694 if (ifa->ifa_addr->sa_family != AF_INET6) 1695 continue; 1696 ifa6 = (struct in6_ifaddr *)ifa; 1697 1698 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 && 1699 IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr, 1700 &ifa6->ia_addr.sin6_addr)) 1701 iffound = 1; 1702 1703 /* 1704 * IPv4-mapped addresses can only be returned by a 1705 * Node Information proxy, since they represent 1706 * addresses of IPv4-only nodes, which perforce do 1707 * not implement this protocol. 1708 * [icmp-name-lookups-07, Section 5.4] 1709 * So we don't support NI_NODEADDR_FLAG_COMPAT in 1710 * this function at this moment. 1711 */ 1712 1713 /* What do we have to do about ::1? */ 1714 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) { 1715 case IPV6_ADDR_SCOPE_LINKLOCAL: 1716 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1717 continue; 1718 break; 1719 case IPV6_ADDR_SCOPE_SITELOCAL: 1720 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1721 continue; 1722 break; 1723 case IPV6_ADDR_SCOPE_GLOBAL: 1724 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1725 continue; 1726 break; 1727 default: 1728 continue; 1729 } 1730 1731 /* 1732 * check if anycast is okay. 1733 * XXX: just experimental. not in the spec. 1734 */ 1735 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1736 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 1737 continue; /* we need only unicast addresses */ 1738 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 && 1739 (icmp6_nodeinfo & 4) == 0) { 1740 continue; 1741 } 1742 addrsofif++; /* count the address */ 1743 } 1744 if (iffound) { 1745 *ifpp = ifp; 1746 IFNET_RUNLOCK(); 1747 return (addrsofif); 1748 } 1749 1750 addrs += addrsofif; 1751 } 1752 IFNET_RUNLOCK(); 1753 1754 return (addrs); 1755} 1756 1757static int 1758ni6_store_addrs(ni6, nni6, ifp0, resid) 1759 struct icmp6_nodeinfo *ni6, *nni6; 1760 struct ifnet *ifp0; 1761 int resid; 1762{ 1763 struct ifnet *ifp = ifp0 ? ifp0 : TAILQ_FIRST(&ifnet); 1764 struct in6_ifaddr *ifa6; 1765 struct ifaddr *ifa; 1766 struct ifnet *ifp_dep = NULL; 1767 int copied = 0, allow_deprecated = 0; 1768 u_char *cp = (u_char *)(nni6 + 1); 1769 int niflags = ni6->ni_flags; 1770 u_int32_t ltime; 1771 1772 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL)) 1773 return (0); /* needless to copy */ 1774 1775 IFNET_RLOCK(); 1776 again: 1777 1778 for (; ifp; ifp = TAILQ_NEXT(ifp, if_list)) { 1779 for (ifa = ifp->if_addrlist.tqh_first; ifa; 1780 ifa = ifa->ifa_list.tqe_next) { 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 } else if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) == 0 && 1798 allow_deprecated != 0) 1799 continue; /* we now collect deprecated addrs */ 1800 1801 /* What do we have to do about ::1? */ 1802 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) { 1803 case IPV6_ADDR_SCOPE_LINKLOCAL: 1804 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1805 continue; 1806 break; 1807 case IPV6_ADDR_SCOPE_SITELOCAL: 1808 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1809 continue; 1810 break; 1811 case IPV6_ADDR_SCOPE_GLOBAL: 1812 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1813 continue; 1814 break; 1815 default: 1816 continue; 1817 } 1818 1819 /* 1820 * check if anycast is okay. 1821 * XXX: just experimental. not in the spec. 1822 */ 1823 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1824 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 1825 continue; 1826 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 && 1827 (icmp6_nodeinfo & 4) == 0) { 1828 continue; 1829 } 1830 1831 /* now we can copy the address */ 1832 if (resid < sizeof(struct in6_addr) + 1833 sizeof(u_int32_t)) { 1834 /* 1835 * We give up much more copy. 1836 * Set the truncate flag and return. 1837 */ 1838 nni6->ni_flags |= NI_NODEADDR_FLAG_TRUNCATE; 1839 IFNET_RUNLOCK(); 1840 return (copied); 1841 } 1842 1843 /* 1844 * Set the TTL of the address. 1845 * The TTL value should be one of the following 1846 * according to the specification: 1847 * 1848 * 1. The remaining lifetime of a DHCP lease on the 1849 * address, or 1850 * 2. The remaining Valid Lifetime of a prefix from 1851 * which the address was derived through Stateless 1852 * Autoconfiguration. 1853 * 1854 * Note that we currently do not support stateful 1855 * address configuration by DHCPv6, so the former 1856 * case can't happen. 1857 */ 1858 if (ifa6->ia6_lifetime.ia6t_expire == 0) 1859 ltime = ND6_INFINITE_LIFETIME; 1860 else { 1861 if (ifa6->ia6_lifetime.ia6t_expire > 1862 time_second) 1863 ltime = htonl(ifa6->ia6_lifetime.ia6t_expire - time_second); 1864 else 1865 ltime = 0; 1866 } 1867 1868 bcopy(<ime, cp, sizeof(u_int32_t)); 1869 cp += sizeof(u_int32_t); 1870 1871 /* copy the address itself */ 1872 bcopy(&ifa6->ia_addr.sin6_addr, cp, 1873 sizeof(struct in6_addr)); 1874 /* XXX: KAME link-local hack; remove ifindex */ 1875 if (IN6_IS_ADDR_LINKLOCAL(&ifa6->ia_addr.sin6_addr)) 1876 ((struct in6_addr *)cp)->s6_addr16[1] = 0; 1877 cp += sizeof(struct in6_addr); 1878 1879 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1880 copied += (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1881 } 1882 if (ifp0) /* we need search only on the specified IF */ 1883 break; 1884 } 1885 1886 if (allow_deprecated == 0 && ifp_dep != NULL) { 1887 ifp = ifp_dep; 1888 allow_deprecated = 1; 1889 1890 goto again; 1891 } 1892 1893 IFNET_RUNLOCK(); 1894 1895 return (copied); 1896} 1897 1898/* 1899 * XXX almost dup'ed code with rip6_input. 1900 */ 1901static int 1902icmp6_rip6_input(mp, off) 1903 struct mbuf **mp; 1904 int off; 1905{ 1906 struct mbuf *m = *mp; 1907 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1908 struct in6pcb *in6p; 1909 struct in6pcb *last = NULL; 1910 struct sockaddr_in6 rip6src; 1911 struct icmp6_hdr *icmp6; 1912 struct mbuf *opts = NULL; 1913 1914#ifndef PULLDOWN_TEST 1915 /* this is assumed to be safe. */ 1916 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off); 1917#else 1918 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 1919 if (icmp6 == NULL) { 1920 /* m is already reclaimed */ 1921 return (IPPROTO_DONE); 1922 } 1923#endif 1924 1925 bzero(&rip6src, sizeof(rip6src)); 1926 rip6src.sin6_len = sizeof(struct sockaddr_in6); 1927 rip6src.sin6_family = AF_INET6; 1928 /* KAME hack: recover scopeid */ 1929 (void)in6_recoverscope(&rip6src, &ip6->ip6_src, m->m_pkthdr.rcvif); 1930 1931 LIST_FOREACH(in6p, &ripcb, inp_list) { 1932 if ((in6p->inp_vflag & INP_IPV6) == 0) 1933 continue; 1934#ifdef HAVE_NRL_INPCB 1935 if (!(in6p->in6p_flags & INP_IPV6)) 1936 continue; 1937#endif 1938 if (in6p->in6p_ip6_nxt != IPPROTO_ICMPV6) 1939 continue; 1940 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && 1941 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst)) 1942 continue; 1943 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) && 1944 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src)) 1945 continue; 1946 if (in6p->in6p_icmp6filt 1947 && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type, 1948 in6p->in6p_icmp6filt)) 1949 continue; 1950 if (last) { 1951 struct mbuf *n; 1952 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { 1953 if (last->in6p_flags & IN6P_CONTROLOPTS) 1954 ip6_savecontrol(last, &opts, ip6, n); 1955 /* strip intermediate headers */ 1956 m_adj(n, off); 1957 if (sbappendaddr(&last->in6p_socket->so_rcv, 1958 (struct sockaddr *)&rip6src, n, opts) 1959 == 0) { 1960 /* should notify about lost packet */ 1961 m_freem(n); 1962 if (opts) { 1963 m_freem(opts); 1964 } 1965 } else 1966 sorwakeup(last->in6p_socket); 1967 opts = NULL; 1968 } 1969 } 1970 last = in6p; 1971 } 1972 if (last) { 1973 if (last->in6p_flags & IN6P_CONTROLOPTS) 1974 ip6_savecontrol(last, &opts, ip6, m); 1975 /* strip intermediate headers */ 1976 m_adj(m, off); 1977 if (sbappendaddr(&last->in6p_socket->so_rcv, 1978 (struct sockaddr *)&rip6src, m, opts) == 0) { 1979 m_freem(m); 1980 if (opts) 1981 m_freem(opts); 1982 } else 1983 sorwakeup(last->in6p_socket); 1984 } else { 1985 m_freem(m); 1986 ip6stat.ip6s_delivered--; 1987 } 1988 return IPPROTO_DONE; 1989} 1990 1991/* 1992 * Reflect the ip6 packet back to the source. 1993 * OFF points to the icmp6 header, counted from the top of the mbuf. 1994 */ 1995void 1996icmp6_reflect(m, off) 1997 struct mbuf *m; 1998 size_t off; 1999{ 2000 struct ip6_hdr *ip6; 2001 struct icmp6_hdr *icmp6; 2002 struct in6_ifaddr *ia; 2003 struct in6_addr t, *src = 0; 2004 int plen; 2005 int type, code; 2006 struct ifnet *outif = NULL; 2007 struct sockaddr_in6 sa6_src, sa6_dst; 2008#ifdef COMPAT_RFC1885 2009 int mtu = IPV6_MMTU; 2010 struct sockaddr_in6 *sin6 = &icmp6_reflect_rt.ro_dst; 2011#endif 2012 2013 /* too short to reflect */ 2014 if (off < sizeof(struct ip6_hdr)) { 2015 nd6log((LOG_DEBUG, 2016 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n", 2017 (u_long)off, (u_long)sizeof(struct ip6_hdr), 2018 __FILE__, __LINE__)); 2019 goto bad; 2020 } 2021 2022 /* 2023 * If there are extra headers between IPv6 and ICMPv6, strip 2024 * off that header first. 2025 */ 2026#ifdef DIAGNOSTIC 2027 if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN) 2028 panic("assumption failed in icmp6_reflect"); 2029#endif 2030 if (off > sizeof(struct ip6_hdr)) { 2031 size_t l; 2032 struct ip6_hdr nip6; 2033 2034 l = off - sizeof(struct ip6_hdr); 2035 m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6); 2036 m_adj(m, l); 2037 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2038 if (m->m_len < l) { 2039 if ((m = m_pullup(m, l)) == NULL) 2040 return; 2041 } 2042 bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6)); 2043 } else /* off == sizeof(struct ip6_hdr) */ { 2044 size_t l; 2045 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2046 if (m->m_len < l) { 2047 if ((m = m_pullup(m, l)) == NULL) 2048 return; 2049 } 2050 } 2051 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr); 2052 ip6 = mtod(m, struct ip6_hdr *); 2053 ip6->ip6_nxt = IPPROTO_ICMPV6; 2054 icmp6 = (struct icmp6_hdr *)(ip6 + 1); 2055 type = icmp6->icmp6_type; /* keep type for statistics */ 2056 code = icmp6->icmp6_code; /* ditto. */ 2057 2058 t = ip6->ip6_dst; 2059 /* 2060 * ip6_input() drops a packet if its src is multicast. 2061 * So, the src is never multicast. 2062 */ 2063 ip6->ip6_dst = ip6->ip6_src; 2064 2065 /* 2066 * XXX: make sure to embed scope zone information, using 2067 * already embedded IDs or the received interface (if any). 2068 * Note that rcvif may be NULL. 2069 * TODO: scoped routing case (XXX). 2070 */ 2071 bzero(&sa6_src, sizeof(sa6_src)); 2072 sa6_src.sin6_family = AF_INET6; 2073 sa6_src.sin6_len = sizeof(sa6_src); 2074 sa6_src.sin6_addr = ip6->ip6_dst; 2075 in6_recoverscope(&sa6_src, &ip6->ip6_dst, m->m_pkthdr.rcvif); 2076 in6_embedscope(&ip6->ip6_dst, &sa6_src, NULL, NULL); 2077 bzero(&sa6_dst, sizeof(sa6_dst)); 2078 sa6_dst.sin6_family = AF_INET6; 2079 sa6_dst.sin6_len = sizeof(sa6_dst); 2080 sa6_dst.sin6_addr = t; 2081 in6_recoverscope(&sa6_dst, &t, m->m_pkthdr.rcvif); 2082 in6_embedscope(&t, &sa6_dst, NULL, NULL); 2083 2084#ifdef COMPAT_RFC1885 2085 /* 2086 * xxx guess MTU 2087 * RFC 1885 requires that echo reply should be truncated if it 2088 * does not fit in with (return) path MTU, but the description was 2089 * removed in the new spec. 2090 */ 2091 if (icmp6_reflect_rt.ro_rt == 0 || 2092 ! (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &ip6->ip6_dst))) { 2093 if (icmp6_reflect_rt.ro_rt) { 2094 RTFREE(icmp6_reflect_rt.ro_rt); 2095 icmp6_reflect_rt.ro_rt = 0; 2096 } 2097 bzero(sin6, sizeof(*sin6)); 2098 sin6->sin6_family = PF_INET6; 2099 sin6->sin6_len = sizeof(struct sockaddr_in6); 2100 sin6->sin6_addr = ip6->ip6_dst; 2101 2102 rtalloc_ign((struct route *)&icmp6_reflect_rt.ro_rt, 2103 RTF_PRCLONING); 2104 } 2105 2106 if (icmp6_reflect_rt.ro_rt == 0) 2107 goto bad; 2108 2109 if ((icmp6_reflect_rt.ro_rt->rt_flags & RTF_HOST) 2110 && mtu < icmp6_reflect_rt.ro_rt->rt_ifp->if_mtu) 2111 mtu = icmp6_reflect_rt.ro_rt->rt_rmx.rmx_mtu; 2112 2113 if (mtu < m->m_pkthdr.len) { 2114 plen -= (m->m_pkthdr.len - mtu); 2115 m_adj(m, mtu - m->m_pkthdr.len); 2116 } 2117#endif 2118 /* 2119 * If the incoming packet was addressed directly to us (i.e. unicast), 2120 * use dst as the src for the reply. 2121 * The IN6_IFF_NOTREADY case should be VERY rare, but is possible 2122 * (for example) when we encounter an error while forwarding procedure 2123 * destined to a duplicated address of ours. 2124 */ 2125 for (ia = in6_ifaddr; ia; ia = ia->ia_next) 2126 if (IN6_ARE_ADDR_EQUAL(&t, &ia->ia_addr.sin6_addr) && 2127 (ia->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) { 2128 src = &t; 2129 break; 2130 } 2131 if (ia == NULL && IN6_IS_ADDR_LINKLOCAL(&t) && (m->m_flags & M_LOOP)) { 2132 /* 2133 * This is the case if the dst is our link-local address 2134 * and the sender is also ourselves. 2135 */ 2136 src = &t; 2137 } 2138 2139 if (src == 0) { 2140 int e; 2141 struct route_in6 ro; 2142 2143 /* 2144 * This case matches to multicasts, our anycast, or unicasts 2145 * that we do not own. Select a source address based on the 2146 * source address of the erroneous packet. 2147 */ 2148 bzero(&ro, sizeof(ro)); 2149 src = in6_selectsrc(&sa6_src, NULL, NULL, &ro, NULL, &e); 2150 if (ro.ro_rt) 2151 RTFREE(ro.ro_rt); /* XXX: we could use this */ 2152 if (src == NULL) { 2153 nd6log((LOG_DEBUG, 2154 "icmp6_reflect: source can't be determined: " 2155 "dst=%s, error=%d\n", 2156 ip6_sprintf(&sa6_src.sin6_addr), e)); 2157 goto bad; 2158 } 2159 } 2160 2161 ip6->ip6_src = *src; 2162 2163 ip6->ip6_flow = 0; 2164 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2165 ip6->ip6_vfc |= IPV6_VERSION; 2166 ip6->ip6_nxt = IPPROTO_ICMPV6; 2167 if (m->m_pkthdr.rcvif) { 2168 /* XXX: This may not be the outgoing interface */ 2169 ip6->ip6_hlim = nd_ifinfo[m->m_pkthdr.rcvif->if_index].chlim; 2170 } else 2171 ip6->ip6_hlim = ip6_defhlim; 2172 2173 icmp6->icmp6_cksum = 0; 2174 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6, 2175 sizeof(struct ip6_hdr), plen); 2176 2177 /* 2178 * XXX option handling 2179 */ 2180 2181 m->m_flags &= ~(M_BCAST|M_MCAST); 2182 2183#ifdef COMPAT_RFC1885 2184 ip6_output(m, NULL, &icmp6_reflect_rt, 0, NULL, &outif, NULL); 2185#else 2186 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL); 2187#endif 2188 if (outif) 2189 icmp6_ifoutstat_inc(outif, type, code); 2190 2191 return; 2192 2193 bad: 2194 m_freem(m); 2195 return; 2196} 2197 2198void 2199icmp6_fasttimo() 2200{ 2201 2202 mld6_fasttimeo(); 2203} 2204 2205static const char * 2206icmp6_redirect_diag(src6, dst6, tgt6) 2207 struct in6_addr *src6; 2208 struct in6_addr *dst6; 2209 struct in6_addr *tgt6; 2210{ 2211 static char buf[1024]; 2212 snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)", 2213 ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6)); 2214 return buf; 2215} 2216 2217void 2218icmp6_redirect_input(m, off) 2219 struct mbuf *m; 2220 int off; 2221{ 2222 struct ifnet *ifp = m->m_pkthdr.rcvif; 2223 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 2224 struct nd_redirect *nd_rd; 2225 int icmp6len = ntohs(ip6->ip6_plen); 2226 char *lladdr = NULL; 2227 int lladdrlen = 0; 2228 u_char *redirhdr = NULL; 2229 int redirhdrlen = 0; 2230 struct rtentry *rt = NULL; 2231 int is_router; 2232 int is_onlink; 2233 struct in6_addr src6 = ip6->ip6_src; 2234 struct in6_addr redtgt6; 2235 struct in6_addr reddst6; 2236 union nd_opts ndopts; 2237 2238 if (!m || !ifp) 2239 return; 2240 2241 /* XXX if we are router, we don't update route by icmp6 redirect */ 2242 if (ip6_forwarding) 2243 goto freeit; 2244 if (!icmp6_rediraccept) 2245 goto freeit; 2246 2247#ifndef PULLDOWN_TEST 2248 IP6_EXTHDR_CHECK(m, off, icmp6len,); 2249 nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off); 2250#else 2251 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len); 2252 if (nd_rd == NULL) { 2253 icmp6stat.icp6s_tooshort++; 2254 return; 2255 } 2256#endif 2257 redtgt6 = nd_rd->nd_rd_target; 2258 reddst6 = nd_rd->nd_rd_dst; 2259 2260 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 2261 redtgt6.s6_addr16[1] = htons(ifp->if_index); 2262 if (IN6_IS_ADDR_LINKLOCAL(&reddst6)) 2263 reddst6.s6_addr16[1] = htons(ifp->if_index); 2264 2265 /* validation */ 2266 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) { 2267 nd6log((LOG_ERR, 2268 "ICMP6 redirect sent from %s rejected; " 2269 "must be from linklocal\n", 2270 ip6_sprintf(&src6))); 2271 goto bad; 2272 } 2273 if (ip6->ip6_hlim != 255) { 2274 nd6log((LOG_ERR, 2275 "ICMP6 redirect sent from %s rejected; " 2276 "hlim=%d (must be 255)\n", 2277 ip6_sprintf(&src6), ip6->ip6_hlim)); 2278 goto bad; 2279 } 2280 { 2281 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */ 2282 struct sockaddr_in6 sin6; 2283 struct in6_addr *gw6; 2284 2285 bzero(&sin6, sizeof(sin6)); 2286 sin6.sin6_family = AF_INET6; 2287 sin6.sin6_len = sizeof(struct sockaddr_in6); 2288 bcopy(&reddst6, &sin6.sin6_addr, sizeof(reddst6)); 2289 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL); 2290 if (rt) { 2291 if (rt->rt_gateway == NULL || 2292 rt->rt_gateway->sa_family != AF_INET6) { 2293 nd6log((LOG_ERR, 2294 "ICMP6 redirect rejected; no route " 2295 "with inet6 gateway found for redirect dst: %s\n", 2296 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2297 RTFREE_LOCKED(rt); 2298 goto bad; 2299 } 2300 2301 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr); 2302 if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) { 2303 nd6log((LOG_ERR, 2304 "ICMP6 redirect rejected; " 2305 "not equal to gw-for-src=%s (must be same): " 2306 "%s\n", 2307 ip6_sprintf(gw6), 2308 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2309 RTFREE_LOCKED(rt); 2310 goto bad; 2311 } 2312 } else { 2313 nd6log((LOG_ERR, 2314 "ICMP6 redirect rejected; " 2315 "no route found for redirect dst: %s\n", 2316 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2317 goto bad; 2318 } 2319 RTFREE_LOCKED(rt); 2320 rt = NULL; 2321 } 2322 if (IN6_IS_ADDR_MULTICAST(&reddst6)) { 2323 nd6log((LOG_ERR, 2324 "ICMP6 redirect rejected; " 2325 "redirect dst must be unicast: %s\n", 2326 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2327 goto bad; 2328 } 2329 2330 is_router = is_onlink = 0; 2331 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 2332 is_router = 1; /* router case */ 2333 if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0) 2334 is_onlink = 1; /* on-link destination case */ 2335 if (!is_router && !is_onlink) { 2336 nd6log((LOG_ERR, 2337 "ICMP6 redirect rejected; " 2338 "neither router case nor onlink case: %s\n", 2339 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2340 goto bad; 2341 } 2342 /* validation passed */ 2343 2344 icmp6len -= sizeof(*nd_rd); 2345 nd6_option_init(nd_rd + 1, icmp6len, &ndopts); 2346 if (nd6_options(&ndopts) < 0) { 2347 nd6log((LOG_INFO, "icmp6_redirect_input: " 2348 "invalid ND option, rejected: %s\n", 2349 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2350 /* nd6_options have incremented stats */ 2351 goto freeit; 2352 } 2353 2354 if (ndopts.nd_opts_tgt_lladdr) { 2355 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 2356 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 2357 } 2358 2359 if (ndopts.nd_opts_rh) { 2360 redirhdrlen = ndopts.nd_opts_rh->nd_opt_rh_len; 2361 redirhdr = (u_char *)(ndopts.nd_opts_rh + 1); /* xxx */ 2362 } 2363 2364 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 2365 nd6log((LOG_INFO, 2366 "icmp6_redirect_input: lladdrlen mismatch for %s " 2367 "(if %d, icmp6 packet %d): %s\n", 2368 ip6_sprintf(&redtgt6), ifp->if_addrlen, lladdrlen - 2, 2369 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2370 goto bad; 2371 } 2372 2373 /* RFC 2461 8.3 */ 2374 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT, 2375 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER); 2376 2377 if (!is_onlink) { /* better router case. perform rtredirect. */ 2378 /* perform rtredirect */ 2379 struct sockaddr_in6 sdst; 2380 struct sockaddr_in6 sgw; 2381 struct sockaddr_in6 ssrc; 2382 2383 bzero(&sdst, sizeof(sdst)); 2384 bzero(&sgw, sizeof(sgw)); 2385 bzero(&ssrc, sizeof(ssrc)); 2386 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6; 2387 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len = 2388 sizeof(struct sockaddr_in6); 2389 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr)); 2390 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2391 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr)); 2392 rtredirect((struct sockaddr *)&sdst, (struct sockaddr *)&sgw, 2393 (struct sockaddr *)NULL, RTF_GATEWAY | RTF_HOST, 2394 (struct sockaddr *)&ssrc); 2395 } 2396 /* finally update cached route in each socket via pfctlinput */ 2397 { 2398 struct sockaddr_in6 sdst; 2399 2400 bzero(&sdst, sizeof(sdst)); 2401 sdst.sin6_family = AF_INET6; 2402 sdst.sin6_len = sizeof(struct sockaddr_in6); 2403 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2404 pfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst); 2405#ifdef IPSEC 2406 key_sa_routechange((struct sockaddr *)&sdst); 2407#endif 2408 } 2409 2410 freeit: 2411 m_freem(m); 2412 return; 2413 2414 bad: 2415 icmp6stat.icp6s_badredirect++; 2416 m_freem(m); 2417} 2418 2419void 2420icmp6_redirect_output(m0, rt) 2421 struct mbuf *m0; 2422 struct rtentry *rt; 2423{ 2424 struct ifnet *ifp; /* my outgoing interface */ 2425 struct in6_addr *ifp_ll6; 2426 struct in6_addr *router_ll6; 2427 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */ 2428 struct mbuf *m = NULL; /* newly allocated one */ 2429 struct ip6_hdr *ip6; /* m as struct ip6_hdr */ 2430 struct nd_redirect *nd_rd; 2431 size_t maxlen; 2432 u_char *p; 2433 struct ifnet *outif = NULL; 2434 struct sockaddr_in6 src_sa; 2435 2436 icmp6_errcount(&icmp6stat.icp6s_outerrhist, ND_REDIRECT, 0); 2437 2438 /* if we are not router, we don't send icmp6 redirect */ 2439 if (!ip6_forwarding || ip6_accept_rtadv) 2440 goto fail; 2441 2442 /* sanity check */ 2443 if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp)) 2444 goto fail; 2445 2446 /* 2447 * Address check: 2448 * the source address must identify a neighbor, and 2449 * the destination address must not be a multicast address 2450 * [RFC 2461, sec 8.2] 2451 */ 2452 sip6 = mtod(m0, struct ip6_hdr *); 2453 bzero(&src_sa, sizeof(src_sa)); 2454 src_sa.sin6_family = AF_INET6; 2455 src_sa.sin6_len = sizeof(src_sa); 2456 src_sa.sin6_addr = sip6->ip6_src; 2457 /* we don't currently use sin6_scope_id, but eventually use it */ 2458 src_sa.sin6_scope_id = in6_addr2scopeid(ifp, &sip6->ip6_src); 2459 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0) 2460 goto fail; 2461 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst)) 2462 goto fail; /* what should we do here? */ 2463 2464 /* rate limit */ 2465 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0)) 2466 goto fail; 2467 2468 /* 2469 * Since we are going to append up to 1280 bytes (= IPV6_MMTU), 2470 * we almost always ask for an mbuf cluster for simplicity. 2471 * (MHLEN < IPV6_MMTU is almost always true) 2472 */ 2473#if IPV6_MMTU >= MCLBYTES 2474# error assumption failed about IPV6_MMTU and MCLBYTES 2475#endif 2476 MGETHDR(m, M_DONTWAIT, MT_HEADER); 2477 if (m && IPV6_MMTU >= MHLEN) 2478 MCLGET(m, M_DONTWAIT); 2479 if (!m) 2480 goto fail; 2481 m->m_pkthdr.rcvif = NULL; 2482 m->m_len = 0; 2483 maxlen = M_TRAILINGSPACE(m); 2484 maxlen = min(IPV6_MMTU, maxlen); 2485 /* just for safety */ 2486 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) + 2487 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) { 2488 goto fail; 2489 } 2490 2491 { 2492 /* get ip6 linklocal address for ifp(my outgoing interface). */ 2493 struct in6_ifaddr *ia; 2494 if ((ia = in6ifa_ifpforlinklocal(ifp, 2495 IN6_IFF_NOTREADY| 2496 IN6_IFF_ANYCAST)) == NULL) 2497 goto fail; 2498 ifp_ll6 = &ia->ia_addr.sin6_addr; 2499 } 2500 2501 /* get ip6 linklocal address for the router. */ 2502 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) { 2503 struct sockaddr_in6 *sin6; 2504 sin6 = (struct sockaddr_in6 *)rt->rt_gateway; 2505 router_ll6 = &sin6->sin6_addr; 2506 if (!IN6_IS_ADDR_LINKLOCAL(router_ll6)) 2507 router_ll6 = (struct in6_addr *)NULL; 2508 } else 2509 router_ll6 = (struct in6_addr *)NULL; 2510 2511 /* ip6 */ 2512 ip6 = mtod(m, struct ip6_hdr *); 2513 ip6->ip6_flow = 0; 2514 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2515 ip6->ip6_vfc |= IPV6_VERSION; 2516 /* ip6->ip6_plen will be set later */ 2517 ip6->ip6_nxt = IPPROTO_ICMPV6; 2518 ip6->ip6_hlim = 255; 2519 /* ip6->ip6_src must be linklocal addr for my outgoing if. */ 2520 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr)); 2521 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr)); 2522 2523 /* ND Redirect */ 2524 nd_rd = (struct nd_redirect *)(ip6 + 1); 2525 nd_rd->nd_rd_type = ND_REDIRECT; 2526 nd_rd->nd_rd_code = 0; 2527 nd_rd->nd_rd_reserved = 0; 2528 if (rt->rt_flags & RTF_GATEWAY) { 2529 /* 2530 * nd_rd->nd_rd_target must be a link-local address in 2531 * better router cases. 2532 */ 2533 if (!router_ll6) 2534 goto fail; 2535 bcopy(router_ll6, &nd_rd->nd_rd_target, 2536 sizeof(nd_rd->nd_rd_target)); 2537 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2538 sizeof(nd_rd->nd_rd_dst)); 2539 } else { 2540 /* make sure redtgt == reddst */ 2541 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target, 2542 sizeof(nd_rd->nd_rd_target)); 2543 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2544 sizeof(nd_rd->nd_rd_dst)); 2545 } 2546 2547 p = (u_char *)(nd_rd + 1); 2548 2549 if (!router_ll6) 2550 goto nolladdropt; 2551 2552 { 2553 /* target lladdr option */ 2554 struct rtentry *rt_router = NULL; 2555 int len; 2556 struct sockaddr_dl *sdl; 2557 struct nd_opt_hdr *nd_opt; 2558 char *lladdr; 2559 2560 rt_router = nd6_lookup(router_ll6, 0, ifp); 2561 if (!rt_router) 2562 goto nolladdropt; 2563 len = sizeof(*nd_opt) + ifp->if_addrlen; 2564 len = (len + 7) & ~7; /* round by 8 */ 2565 /* safety check */ 2566 if (len + (p - (u_char *)ip6) > maxlen) 2567 goto nolladdropt; 2568 if (!(rt_router->rt_flags & RTF_GATEWAY) && 2569 (rt_router->rt_flags & RTF_LLINFO) && 2570 (rt_router->rt_gateway->sa_family == AF_LINK) && 2571 (sdl = (struct sockaddr_dl *)rt_router->rt_gateway) && 2572 sdl->sdl_alen) { 2573 nd_opt = (struct nd_opt_hdr *)p; 2574 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 2575 nd_opt->nd_opt_len = len >> 3; 2576 lladdr = (char *)(nd_opt + 1); 2577 bcopy(LLADDR(sdl), lladdr, ifp->if_addrlen); 2578 p += len; 2579 } 2580 } 2581nolladdropt:; 2582 2583 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2584 2585 /* just to be safe */ 2586#ifdef M_DECRYPTED /*not openbsd*/ 2587 if (m0->m_flags & M_DECRYPTED) 2588 goto noredhdropt; 2589#endif 2590 if (p - (u_char *)ip6 > maxlen) 2591 goto noredhdropt; 2592 2593 { 2594 /* redirected header option */ 2595 int len; 2596 struct nd_opt_rd_hdr *nd_opt_rh; 2597 2598 /* 2599 * compute the maximum size for icmp6 redirect header option. 2600 * XXX room for auth header? 2601 */ 2602 len = maxlen - (p - (u_char *)ip6); 2603 len &= ~7; 2604 2605 /* This is just for simplicity. */ 2606 if (m0->m_pkthdr.len != m0->m_len) { 2607 if (m0->m_next) { 2608 m_freem(m0->m_next); 2609 m0->m_next = NULL; 2610 } 2611 m0->m_pkthdr.len = m0->m_len; 2612 } 2613 2614 /* 2615 * Redirected header option spec (RFC2461 4.6.3) talks nothing 2616 * about padding/truncate rule for the original IP packet. 2617 * From the discussion on IPv6imp in Feb 1999, 2618 * the consensus was: 2619 * - "attach as much as possible" is the goal 2620 * - pad if not aligned (original size can be guessed by 2621 * original ip6 header) 2622 * Following code adds the padding if it is simple enough, 2623 * and truncates if not. 2624 */ 2625 if (m0->m_next || m0->m_pkthdr.len != m0->m_len) 2626 panic("assumption failed in %s:%d", __FILE__, 2627 __LINE__); 2628 2629 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) { 2630 /* not enough room, truncate */ 2631 m0->m_pkthdr.len = m0->m_len = len - 2632 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 - 2652 sizeof(*nd_opt_rh); 2653 } 2654 2655 nd_opt_rh = (struct nd_opt_rd_hdr *)p; 2656 bzero(nd_opt_rh, sizeof(*nd_opt_rh)); 2657 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER; 2658 nd_opt_rh->nd_opt_rh_len = len >> 3; 2659 p += sizeof(*nd_opt_rh); 2660 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2661 2662 /* connect m0 to m */ 2663 m_tag_delete_chain(m0, NULL); 2664 m0->m_flags &= ~M_PKTHDR; 2665 m->m_next = m0; 2666 m->m_pkthdr.len = m->m_len + m0->m_len; 2667 m0 = NULL; 2668 } 2669noredhdropt:; 2670 if (m0) { 2671 m_freem(m0); 2672 m0 = NULL; 2673 } 2674 2675 if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_src)) 2676 sip6->ip6_src.s6_addr16[1] = 0; 2677 if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_dst)) 2678 sip6->ip6_dst.s6_addr16[1] = 0; 2679 if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_target)) 2680 nd_rd->nd_rd_target.s6_addr16[1] = 0; 2681 if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_dst)) 2682 nd_rd->nd_rd_dst.s6_addr16[1] = 0; 2683 2684 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 2685 2686 nd_rd->nd_rd_cksum = 0; 2687 nd_rd->nd_rd_cksum = in6_cksum(m, IPPROTO_ICMPV6, 2688 sizeof(*ip6), ntohs(ip6->ip6_plen)); 2689 2690 /* send the packet to outside... */ 2691 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL); 2692 if (outif) { 2693 icmp6_ifstat_inc(outif, ifs6_out_msg); 2694 icmp6_ifstat_inc(outif, ifs6_out_redirect); 2695 } 2696 icmp6stat.icp6s_outhist[ND_REDIRECT]++; 2697 2698 return; 2699 2700fail: 2701 if (m) 2702 m_freem(m); 2703 if (m0) 2704 m_freem(m0); 2705} 2706 2707#ifdef HAVE_NRL_INPCB 2708#define sotoin6pcb sotoinpcb 2709#define in6pcb inpcb 2710#define in6p_icmp6filt inp_icmp6filt 2711#endif 2712/* 2713 * ICMPv6 socket option processing. 2714 */ 2715int 2716icmp6_ctloutput(so, sopt) 2717 struct socket *so; 2718 struct sockopt *sopt; 2719{ 2720 int error = 0; 2721 int optlen; 2722 struct inpcb *inp = sotoinpcb(so); 2723 int level, op, optname; 2724 2725 if (sopt) { 2726 level = sopt->sopt_level; 2727 op = sopt->sopt_dir; 2728 optname = sopt->sopt_name; 2729 optlen = sopt->sopt_valsize; 2730 } else 2731 level = op = optname = optlen = 0; 2732 2733 if (level != IPPROTO_ICMPV6) { 2734 return EINVAL; 2735 } 2736 2737 switch (op) { 2738 case PRCO_SETOPT: 2739 switch (optname) { 2740 case ICMP6_FILTER: 2741 { 2742 struct icmp6_filter *p; 2743 2744 if (optlen != sizeof(*p)) { 2745 error = EMSGSIZE; 2746 break; 2747 } 2748 if (inp->in6p_icmp6filt == NULL) { 2749 error = EINVAL; 2750 break; 2751 } 2752 error = sooptcopyin(sopt, inp->in6p_icmp6filt, optlen, 2753 optlen); 2754 break; 2755 } 2756 2757 default: 2758 error = ENOPROTOOPT; 2759 break; 2760 } 2761 break; 2762 2763 case PRCO_GETOPT: 2764 switch (optname) { 2765 case ICMP6_FILTER: 2766 { 2767 if (inp->in6p_icmp6filt == NULL) { 2768 error = EINVAL; 2769 break; 2770 } 2771 error = sooptcopyout(sopt, inp->in6p_icmp6filt, 2772 sizeof(struct icmp6_filter)); 2773 break; 2774 } 2775 2776 default: 2777 error = ENOPROTOOPT; 2778 break; 2779 } 2780 break; 2781 } 2782 2783 return (error); 2784} 2785#ifdef HAVE_NRL_INPCB 2786#undef sotoin6pcb 2787#undef in6pcb 2788#undef in6p_icmp6filt 2789#endif 2790 2791#ifndef HAVE_PPSRATECHECK 2792#ifndef timersub 2793#define timersub(tvp, uvp, vvp) \ 2794 do { \ 2795 (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec; \ 2796 (vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec; \ 2797 if ((vvp)->tv_usec < 0) { \ 2798 (vvp)->tv_sec--; \ 2799 (vvp)->tv_usec += 1000000; \ 2800 } \ 2801 } while (0) 2802#endif 2803 2804/* 2805 * ppsratecheck(): packets (or events) per second limitation. 2806 */ 2807static int 2808ppsratecheck(lasttime, curpps, maxpps) 2809 struct timeval *lasttime; 2810 int *curpps; 2811 int maxpps; /* maximum pps allowed */ 2812{ 2813 struct timeval tv, delta; 2814 int s, rv; 2815 2816 s = splclock(); 2817 microtime(&tv); 2818 splx(s); 2819 2820 timersub(&tv, lasttime, &delta); 2821 2822 /* 2823 * Check for 0,0 so that the message will be seen at least once. 2824 * If more than one second has passed since the last update of 2825 * lasttime, reset the counter. 2826 * 2827 * We do increment *curpps even in *curpps < maxpps case, as some may 2828 * try to use *curpps for stat purposes as well. 2829 */ 2830 if ((lasttime->tv_sec == 0 && lasttime->tv_usec == 0) || 2831 delta.tv_sec >= 1) { 2832 *lasttime = tv; 2833 *curpps = 0; 2834 rv = 1; 2835 } else if (maxpps < 0) 2836 rv = 1; 2837 else if (*curpps < maxpps) 2838 rv = 1; 2839 else 2840 rv = 0; 2841 2842#if 1 /* DIAGNOSTIC? */ 2843 /* be careful about wrap-around */ 2844 if (*curpps + 1 > *curpps) 2845 *curpps = *curpps + 1; 2846#else 2847 /* 2848 * assume that there's not too many calls to this function. 2849 * not sure if the assumption holds, as it depends on *caller's* 2850 * behavior, not the behavior of this function. 2851 * IMHO it is wrong to make assumption on the caller's behavior, 2852 * so the above #if is #if 1, not #ifdef DIAGNOSTIC. 2853 */ 2854 *curpps = *curpps + 1; 2855#endif 2856 2857 return (rv); 2858} 2859#endif 2860 2861/* 2862 * Perform rate limit check. 2863 * Returns 0 if it is okay to send the icmp6 packet. 2864 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate 2865 * limitation. 2866 * 2867 * XXX per-destination/type check necessary? 2868 */ 2869static int 2870icmp6_ratelimit(dst, type, code) 2871 const struct in6_addr *dst; /* not used at this moment */ 2872 const int type; /* not used at this moment */ 2873 const int code; /* not used at this moment */ 2874{ 2875 int ret; 2876 2877 ret = 0; /* okay to send */ 2878 2879 /* PPS limit */ 2880 if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count, 2881 icmp6errppslim)) { 2882 /* The packet is subject to rate limit */ 2883 ret++; 2884 } 2885 2886 return ret; 2887} 2888