icmp6.c revision 1.38
1/* $NetBSD: icmp6.c,v 1.38 2000/07/28 04:06:58 itojun Exp $ */ 2/* $KAME: icmp6.c,v 1.120 2000/07/06 11:47:20 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_ipsec.h" 70 71#include <sys/param.h> 72#include <sys/systm.h> 73#include <sys/malloc.h> 74#include <sys/mbuf.h> 75#include <sys/protosw.h> 76#include <sys/socket.h> 77#include <sys/socketvar.h> 78#include <sys/time.h> 79#include <sys/kernel.h> 80#include <sys/syslog.h> 81#include <sys/domain.h> 82 83#include <net/if.h> 84#include <net/route.h> 85#include <net/if_dl.h> 86#include <net/if_types.h> 87 88#include <netinet/in.h> 89#include <netinet/in_var.h> 90#include <netinet/ip6.h> 91#include <netinet6/ip6_var.h> 92#include <netinet/icmp6.h> 93#include <netinet6/mld6_var.h> 94#include <netinet6/in6_pcb.h> 95#include <netinet6/nd6.h> 96#include <netinet6/in6_ifattach.h> 97#include <netinet6/ip6protosw.h> 98 99 100#ifdef IPSEC 101#include <netinet6/ipsec.h> 102#include <netkey/key.h> 103#endif 104 105#include "faith.h" 106 107#include <net/net_osdep.h> 108 109extern struct domain inet6domain; 110 111struct icmp6stat icmp6stat; 112 113extern struct in6pcb rawin6pcb; 114extern int icmp6errppslim; 115static int icmp6errpps_count = 0; 116static struct timeval icmp6errppslim_last; 117extern int icmp6_nodeinfo; 118static struct rttimer_queue *icmp6_mtudisc_timeout_q = NULL; 119extern int pmtu_expire; 120 121static void icmp6_errcount __P((struct icmp6errstat *, int, int)); 122static int icmp6_rip6_input __P((struct mbuf **, int)); 123static void icmp6_mtudisc_update __P((struct in6_addr *, struct icmp6_hdr *, 124 struct mbuf *)); 125static int icmp6_ratelimit __P((const struct in6_addr *, const int, const int)); 126static const char *icmp6_redirect_diag __P((struct in6_addr *, 127 struct in6_addr *, struct in6_addr *)); 128static struct mbuf *ni6_input __P((struct mbuf *, int)); 129static struct mbuf *ni6_nametodns __P((const char *, int, int)); 130static int ni6_dnsmatch __P((const char *, int, const char *, int)); 131static int ni6_addrs __P((struct icmp6_nodeinfo *, struct mbuf *, 132 struct ifnet **)); 133static int ni6_store_addrs __P((struct icmp6_nodeinfo *, struct icmp6_nodeinfo *, 134 struct ifnet *, int)); 135static struct rtentry *icmp6_mtudisc_clone __P((struct sockaddr *)); 136static void icmp6_mtudisc_timeout __P((struct rtentry *, struct rttimer *)); 137 138#ifdef COMPAT_RFC1885 139static struct route_in6 icmp6_reflect_rt; 140#endif 141 142void 143icmp6_init() 144{ 145 mld6_init(); 146 icmp6_mtudisc_timeout_q = rt_timer_queue_create(pmtu_expire); 147} 148 149static void 150icmp6_errcount(stat, type, code) 151 struct icmp6errstat *stat; 152 int type, code; 153{ 154 switch(type) { 155 case ICMP6_DST_UNREACH: 156 switch (code) { 157 case ICMP6_DST_UNREACH_NOROUTE: 158 stat->icp6errs_dst_unreach_noroute++; 159 return; 160 case ICMP6_DST_UNREACH_ADMIN: 161 stat->icp6errs_dst_unreach_admin++; 162 return; 163 case ICMP6_DST_UNREACH_BEYONDSCOPE: 164 stat->icp6errs_dst_unreach_beyondscope++; 165 return; 166 case ICMP6_DST_UNREACH_ADDR: 167 stat->icp6errs_dst_unreach_addr++; 168 return; 169 case ICMP6_DST_UNREACH_NOPORT: 170 stat->icp6errs_dst_unreach_noport++; 171 return; 172 } 173 break; 174 case ICMP6_PACKET_TOO_BIG: 175 stat->icp6errs_packet_too_big++; 176 return; 177 case ICMP6_TIME_EXCEEDED: 178 switch(code) { 179 case ICMP6_TIME_EXCEED_TRANSIT: 180 stat->icp6errs_time_exceed_transit++; 181 return; 182 case ICMP6_TIME_EXCEED_REASSEMBLY: 183 stat->icp6errs_time_exceed_reassembly++; 184 return; 185 } 186 break; 187 case ICMP6_PARAM_PROB: 188 switch(code) { 189 case ICMP6_PARAMPROB_HEADER: 190 stat->icp6errs_paramprob_header++; 191 return; 192 case ICMP6_PARAMPROB_NEXTHEADER: 193 stat->icp6errs_paramprob_nextheader++; 194 return; 195 case ICMP6_PARAMPROB_OPTION: 196 stat->icp6errs_paramprob_option++; 197 return; 198 } 199 break; 200 case ND_REDIRECT: 201 stat->icp6errs_redirect++; 202 return; 203 } 204 stat->icp6errs_unknown++; 205} 206 207/* 208 * Generate an error packet of type error in response to bad IP6 packet. 209 */ 210void 211icmp6_error(m, type, code, param) 212 struct mbuf *m; 213 int type, code, param; 214{ 215 struct ip6_hdr *oip6, *nip6; 216 struct icmp6_hdr *icmp6; 217 u_int preplen; 218 int off; 219 int nxt; 220 221 icmp6stat.icp6s_error++; 222 223 /* count per-type-code statistics */ 224 icmp6_errcount(&icmp6stat.icp6s_outerrhist, type, code); 225 226 if (m->m_flags & M_DECRYPTED) { 227 icmp6stat.icp6s_canterror++; 228 goto freeit; 229 } 230 231#ifndef PULLDOWN_TEST 232 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), ); 233#else 234 if (m->m_len < sizeof(struct ip6_hdr)) { 235 m = m_pullup(m, sizeof(struct ip6_hdr)); 236 if (m == NULL) 237 return; 238 } 239#endif 240 oip6 = mtod(m, struct ip6_hdr *); 241 242 /* 243 * Multicast destination check. For unrecognized option errors, 244 * this check has already done in ip6_unknown_opt(), so we can 245 * check only for other errors. 246 */ 247 if ((m->m_flags & (M_BCAST|M_MCAST) || 248 IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) && 249 (type != ICMP6_PACKET_TOO_BIG && 250 (type != ICMP6_PARAM_PROB || 251 code != ICMP6_PARAMPROB_OPTION))) 252 goto freeit; 253 254 /* Source address check. XXX: the case of anycast source? */ 255 if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) || 256 IN6_IS_ADDR_MULTICAST(&oip6->ip6_src)) 257 goto freeit; 258 259 /* 260 * If we are about to send ICMPv6 against ICMPv6 error/redirect, 261 * don't do it. 262 */ 263 nxt = -1; 264 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 265 if (off >= 0 && nxt == IPPROTO_ICMPV6) { 266 struct icmp6_hdr *icp; 267 268#ifndef PULLDOWN_TEST 269 IP6_EXTHDR_CHECK(m, 0, off + sizeof(struct icmp6_hdr), ); 270 icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 271#else 272 IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off, 273 sizeof(*icp)); 274 if (icp == NULL) { 275 icmp6stat.icp6s_tooshort++; 276 return; 277 } 278#endif 279 if (icp->icmp6_type < ICMP6_ECHO_REQUEST || 280 icp->icmp6_type == ND_REDIRECT) { 281 /* 282 * ICMPv6 error 283 * Special case: for redirect (which is 284 * informational) we must not send icmp6 error. 285 */ 286 icmp6stat.icp6s_canterror++; 287 goto freeit; 288 } else { 289 /* ICMPv6 informational - send the error */ 290 } 291 } else { 292 /* non-ICMPv6 - send the error */ 293 } 294 295 oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */ 296 297 /* Finally, do rate limitation check. */ 298 if (icmp6_ratelimit(&oip6->ip6_src, type, code)) { 299 icmp6stat.icp6s_toofreq++; 300 goto freeit; 301 } 302 303 /* 304 * OK, ICMP6 can be generated. 305 */ 306 307 if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN) 308 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len); 309 310 preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 311 M_PREPEND(m, preplen, M_DONTWAIT); 312 if (m && m->m_len < preplen) 313 m = m_pullup(m, preplen); 314 if (m == NULL) { 315 printf("ENOBUFS in icmp6_error %d\n", __LINE__); 316 return; 317 } 318 319 nip6 = mtod(m, struct ip6_hdr *); 320 nip6->ip6_src = oip6->ip6_src; 321 nip6->ip6_dst = oip6->ip6_dst; 322 323 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_src)) 324 oip6->ip6_src.s6_addr16[1] = 0; 325 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_dst)) 326 oip6->ip6_dst.s6_addr16[1] = 0; 327 328 icmp6 = (struct icmp6_hdr *)(nip6 + 1); 329 icmp6->icmp6_type = type; 330 icmp6->icmp6_code = code; 331 icmp6->icmp6_pptr = htonl((u_int32_t)param); 332 333 icmp6stat.icp6s_outhist[type]++; 334 icmp6_reflect(m, sizeof(struct ip6_hdr)); /*header order: IPv6 - ICMPv6*/ 335 336 return; 337 338 freeit: 339 /* 340 * If we can't tell wheter or not we can generate ICMP6, free it. 341 */ 342 m_freem(m); 343} 344 345/* 346 * Process a received ICMP6 message. 347 */ 348int 349icmp6_input(mp, offp, proto) 350 struct mbuf **mp; 351 int *offp, proto; 352{ 353 struct mbuf *m = *mp, *n; 354 struct ip6_hdr *ip6, *nip6; 355 struct icmp6_hdr *icmp6, *nicmp6; 356 int off = *offp; 357 int icmp6len = m->m_pkthdr.len - *offp; 358 int code, sum, noff; 359 struct sockaddr_in6 icmp6src; 360 361#ifndef PULLDOWN_TEST 362 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr), IPPROTO_DONE); 363 /* m might change if M_LOOP. So, call mtod after this */ 364#endif 365 366 /* 367 * Locate icmp6 structure in mbuf, and check 368 * that not corrupted and of at least minimum length 369 */ 370 371 ip6 = mtod(m, struct ip6_hdr *); 372 if (icmp6len < sizeof(struct icmp6_hdr)) { 373 icmp6stat.icp6s_tooshort++; 374 goto freeit; 375 } 376 377 /* 378 * calculate the checksum 379 */ 380#ifndef PULLDOWN_TEST 381 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off); 382#else 383 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 384 if (icmp6 == NULL) { 385 icmp6stat.icp6s_tooshort++; 386 return IPPROTO_DONE; 387 } 388#endif 389 code = icmp6->icmp6_code; 390 391 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) { 392 log(LOG_ERR, 393 "ICMP6 checksum error(%d|%x) %s\n", 394 icmp6->icmp6_type, 395 sum, 396 ip6_sprintf(&ip6->ip6_src)); 397 icmp6stat.icp6s_checksum++; 398 goto freeit; 399 } 400 401#if defined(NFAITH) && 0 < NFAITH 402 if (m->m_pkthdr.rcvif && m->m_pkthdr.rcvif->if_type == IFT_FAITH) { 403 /* 404 * Deliver very specific ICMP6 type only. 405 * This is important to deilver TOOBIG. Otherwise PMTUD 406 * will not work. 407 */ 408 switch (icmp6->icmp6_type) { 409 case ICMP6_DST_UNREACH: 410 case ICMP6_PACKET_TOO_BIG: 411 case ICMP6_TIME_EXCEEDED: 412 break; 413 default: 414 goto freeit; 415 } 416 } 417#endif 418 419#ifdef IPSEC 420 /* drop it if it does not match the default policy */ 421 if (ipsec6_in_reject(m, NULL)) { 422 ipsecstat.in_polvio++; 423 goto freeit; 424 } 425#endif 426 427 icmp6stat.icp6s_inhist[icmp6->icmp6_type]++; 428 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_msg); 429 if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK) 430 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error); 431 432 switch (icmp6->icmp6_type) { 433 434 case ICMP6_DST_UNREACH: 435 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_dstunreach); 436 switch (code) { 437 case ICMP6_DST_UNREACH_NOROUTE: 438 code = PRC_UNREACH_NET; 439 break; 440 case ICMP6_DST_UNREACH_ADMIN: 441 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_adminprohib); 442 code = PRC_UNREACH_PROTOCOL; /* is this a good code? */ 443 break; 444 case ICMP6_DST_UNREACH_ADDR: 445 code = PRC_HOSTDEAD; 446 break; 447#ifdef COMPAT_RFC1885 448 case ICMP6_DST_UNREACH_NOTNEIGHBOR: 449 code = PRC_UNREACH_SRCFAIL; 450 break; 451#else 452 case ICMP6_DST_UNREACH_BEYONDSCOPE: 453 /* I mean "source address was incorrect." */ 454 code = PRC_PARAMPROB; 455 break; 456#endif 457 case ICMP6_DST_UNREACH_NOPORT: 458 code = PRC_UNREACH_PORT; 459 break; 460 default: 461 goto badcode; 462 } 463 goto deliver; 464 break; 465 466 case ICMP6_PACKET_TOO_BIG: 467 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_pkttoobig); 468 if (code != 0) 469 goto badcode; 470 471 code = PRC_MSGSIZE; 472 473 /* 474 * Updating the path MTU will be done after examining 475 * intermediate extension headers. 476 */ 477 goto deliver; 478 break; 479 480 case ICMP6_TIME_EXCEEDED: 481 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_timeexceed); 482 switch (code) { 483 case ICMP6_TIME_EXCEED_TRANSIT: 484 case ICMP6_TIME_EXCEED_REASSEMBLY: 485 code += PRC_TIMXCEED_INTRANS; 486 break; 487 default: 488 goto badcode; 489 } 490 goto deliver; 491 break; 492 493 case ICMP6_PARAM_PROB: 494 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_paramprob); 495 switch (code) { 496 case ICMP6_PARAMPROB_NEXTHEADER: 497 code = PRC_UNREACH_PROTOCOL; 498 break; 499 case ICMP6_PARAMPROB_HEADER: 500 case ICMP6_PARAMPROB_OPTION: 501 code = PRC_PARAMPROB; 502 break; 503 default: 504 goto badcode; 505 } 506 goto deliver; 507 break; 508 509 case ICMP6_ECHO_REQUEST: 510 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echo); 511 if (code != 0) 512 goto badcode; 513 if ((n = m_copy(m, 0, M_COPYALL)) == NULL) { 514 /* Give up remote */ 515 break; 516 } 517 if ((n->m_flags & M_EXT) != 0 518 || n->m_len < off + sizeof(struct icmp6_hdr)) { 519 struct mbuf *n0 = n; 520 const int maxlen = sizeof(*nip6) + sizeof(*nicmp6); 521 522 /* 523 * Prepare an internal mbuf. m_pullup() doesn't 524 * always copy the length we specified. 525 */ 526 if (maxlen >= MCLBYTES) { 527#ifdef DIAGNOSTIC 528 printf("MCLBYTES too small\n"); 529#endif 530 /* Give up remote */ 531 m_freem(n0); 532 break; 533 } 534 MGETHDR(n, M_DONTWAIT, n0->m_type); 535 if (n && maxlen >= MHLEN) { 536 MCLGET(n, M_DONTWAIT); 537 if ((n->m_flags & M_EXT) == 0) { 538 m_free(n); 539 n = NULL; 540 } 541 } 542 if (n == NULL) { 543 /* Give up remote */ 544 m_freem(n0); 545 break; 546 } 547 M_COPY_PKTHDR(n, n0); 548 /* 549 * Copy IPv6 and ICMPv6 only. 550 */ 551 nip6 = mtod(n, struct ip6_hdr *); 552 bcopy(ip6, nip6, sizeof(struct ip6_hdr)); 553 nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 554 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); 555 noff = sizeof(struct ip6_hdr); 556 n->m_pkthdr.len = n->m_len = 557 noff + sizeof(struct icmp6_hdr); 558 /* 559 * Adjust mbuf. ip6_plen will be adjusted in 560 * ip6_output(). 561 */ 562 m_adj(n0, off + sizeof(struct icmp6_hdr)); 563 n->m_pkthdr.len += n0->m_pkthdr.len; 564 n->m_next = n0; 565 n0->m_flags &= ~M_PKTHDR; 566 } else { 567 nip6 = mtod(n, struct ip6_hdr *); 568 nicmp6 = (struct icmp6_hdr *)((caddr_t)nip6 + off); 569 noff = off; 570 } 571 nicmp6->icmp6_type = ICMP6_ECHO_REPLY; 572 nicmp6->icmp6_code = 0; 573 if (n) { 574 icmp6stat.icp6s_reflect++; 575 icmp6stat.icp6s_outhist[ICMP6_ECHO_REPLY]++; 576 icmp6_reflect(n, noff); 577 } 578 break; 579 580 case ICMP6_ECHO_REPLY: 581 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echoreply); 582 if (code != 0) 583 goto badcode; 584 break; 585 586 case MLD6_LISTENER_QUERY: 587 case MLD6_LISTENER_REPORT: 588 if (icmp6len < sizeof(struct mld6_hdr)) 589 goto badlen; 590 if (icmp6->icmp6_type == MLD6_LISTENER_QUERY) /* XXX: ugly... */ 591 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldquery); 592 else 593 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldreport); 594 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 595 /* give up local */ 596 mld6_input(m, off); 597 m = NULL; 598 goto freeit; 599 } 600 mld6_input(n, off); 601 /* m stays. */ 602 break; 603 604 case MLD6_LISTENER_DONE: 605 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mlddone); 606 if (icmp6len < sizeof(struct mld6_hdr)) /* necessary? */ 607 goto badlen; 608 break; /* nothing to be done in kernel */ 609 610 case MLD6_MTRACE_RESP: 611 case MLD6_MTRACE: 612 /* XXX: these two are experimental. not officially defind. */ 613 /* XXX: per-interface statistics? */ 614 break; /* just pass it to applications */ 615 616 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */ 617 { 618 enum { WRU, FQDN } mode; 619 620 if (!icmp6_nodeinfo) 621 break; 622 623 if (icmp6len == sizeof(struct icmp6_hdr) + 4) 624 mode = WRU; 625 else if (icmp6len >= sizeof(struct icmp6_nodeinfo)) 626 mode = FQDN; 627 else 628 goto badlen; 629 630 if (mode == FQDN) { 631#ifndef PULLDOWN_TEST 632 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo), 633 IPPROTO_DONE); 634#endif 635 n = m_copy(m, 0, M_COPYALL); 636 if (n) 637 n = ni6_input(n, off); 638 /* XXX meaningless if n == NULL */ 639 noff = sizeof(struct ip6_hdr); 640 } else { 641 u_char *p; 642 int maxlen, maxhlen; 643 644 if (code != 0) 645 goto badcode; 646 maxlen = sizeof(*nip6) + sizeof(*nicmp6) + 4; 647 if (maxlen >= MCLBYTES) { 648#ifdef DIAGNOSTIC 649 printf("MCLBYTES too small\n"); 650#endif 651 /* Give up remote */ 652 break; 653 } 654 MGETHDR(n, M_DONTWAIT, m->m_type); 655 if (n && maxlen > MHLEN) { 656 MCLGET(n, M_DONTWAIT); 657 if ((n->m_flags & M_EXT) == 0) { 658 m_free(n); 659 n = NULL; 660 } 661 } 662 if (n == NULL) { 663 /* Give up remote */ 664 break; 665 } 666 n->m_len = 0; 667 maxhlen = M_TRAILINGSPACE(n) - maxlen; 668 if (maxhlen > hostnamelen) 669 maxhlen = hostnamelen; 670 /* 671 * Copy IPv6 and ICMPv6 only. 672 */ 673 nip6 = mtod(n, struct ip6_hdr *); 674 bcopy(ip6, nip6, sizeof(struct ip6_hdr)); 675 nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 676 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); 677 p = (u_char *)(nicmp6 + 1); 678 bzero(p, 4); 679 bcopy(hostname, p + 4, maxhlen); /*meaningless TTL*/ 680 noff = sizeof(struct ip6_hdr); 681 M_COPY_PKTHDR(n, m); /* just for recvif */ 682 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 683 sizeof(struct icmp6_hdr) + 4 + maxhlen; 684 nicmp6->icmp6_type = ICMP6_WRUREPLY; 685 nicmp6->icmp6_code = 0; 686 } 687#undef hostnamelen 688 if (n) { 689 icmp6stat.icp6s_reflect++; 690 icmp6stat.icp6s_outhist[ICMP6_WRUREPLY]++; 691 icmp6_reflect(n, noff); 692 } 693 break; 694 } 695 696 case ICMP6_WRUREPLY: 697 if (code != 0) 698 goto badcode; 699 break; 700 701 case ND_ROUTER_SOLICIT: 702 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routersolicit); 703 if (code != 0) 704 goto badcode; 705 if (icmp6len < sizeof(struct nd_router_solicit)) 706 goto badlen; 707 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 708 /* give up local */ 709 nd6_rs_input(m, off, icmp6len); 710 m = NULL; 711 goto freeit; 712 } 713 nd6_rs_input(n, off, icmp6len); 714 /* m stays. */ 715 break; 716 717 case ND_ROUTER_ADVERT: 718 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routeradvert); 719 if (code != 0) 720 goto badcode; 721 if (icmp6len < sizeof(struct nd_router_advert)) 722 goto badlen; 723 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 724 /* give up local */ 725 nd6_ra_input(m, off, icmp6len); 726 m = NULL; 727 goto freeit; 728 } 729 nd6_ra_input(n, off, icmp6len); 730 /* m stays. */ 731 break; 732 733 case ND_NEIGHBOR_SOLICIT: 734 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighborsolicit); 735 if (code != 0) 736 goto badcode; 737 if (icmp6len < sizeof(struct nd_neighbor_solicit)) 738 goto badlen; 739 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 740 /* give up local */ 741 nd6_ns_input(m, off, icmp6len); 742 m = NULL; 743 goto freeit; 744 } 745 nd6_ns_input(n, off, icmp6len); 746 /* m stays. */ 747 break; 748 749 case ND_NEIGHBOR_ADVERT: 750 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighboradvert); 751 if (code != 0) 752 goto badcode; 753 if (icmp6len < sizeof(struct nd_neighbor_advert)) 754 goto badlen; 755 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 756 /* give up local */ 757 nd6_na_input(m, off, icmp6len); 758 m = NULL; 759 goto freeit; 760 } 761 nd6_na_input(n, off, icmp6len); 762 /* m stays. */ 763 break; 764 765 case ND_REDIRECT: 766 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_redirect); 767 if (code != 0) 768 goto badcode; 769 if (icmp6len < sizeof(struct nd_redirect)) 770 goto badlen; 771 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 772 /* give up local */ 773 icmp6_redirect_input(m, off); 774 m = NULL; 775 goto freeit; 776 } 777 icmp6_redirect_input(n, off); 778 /* m stays. */ 779 break; 780 781 case ICMP6_ROUTER_RENUMBERING: 782 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND && 783 code != ICMP6_ROUTER_RENUMBERING_RESULT) 784 goto badcode; 785 if (icmp6len < sizeof(struct icmp6_router_renum)) 786 goto badlen; 787 break; 788 789 default: 790 printf("icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n", 791 icmp6->icmp6_type, ip6_sprintf(&ip6->ip6_src), 792 ip6_sprintf(&ip6->ip6_dst), 793 m->m_pkthdr.rcvif ? m->m_pkthdr.rcvif->if_index : 0); 794 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) { 795 /* ICMPv6 error: MUST deliver it by spec... */ 796 code = PRC_NCMDS; 797 /* deliver */ 798 } else { 799 /* ICMPv6 informational: MUST not deliver */ 800 break; 801 } 802 deliver: 803 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) { 804 icmp6stat.icp6s_tooshort++; 805 goto freeit; 806 } 807#ifndef PULLDOWN_TEST 808 IP6_EXTHDR_CHECK(m, off, 809 sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr), 810 IPPROTO_DONE); 811 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 812#else 813 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 814 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 815 if (icmp6 == NULL) { 816 icmp6stat.icp6s_tooshort++; 817 return IPPROTO_DONE; 818 } 819#endif 820 bzero(&icmp6src, sizeof(icmp6src)); 821 icmp6src.sin6_len = sizeof(struct sockaddr_in6); 822 icmp6src.sin6_family = AF_INET6; 823 icmp6src.sin6_addr = ((struct ip6_hdr *)(icmp6 + 1))->ip6_dst; 824 825 /* Detect the upper level protocol */ 826 { 827 void (*ctlfunc) __P((int, struct sockaddr *, void *)); 828 struct ip6_hdr *eip6 = (struct ip6_hdr *)(icmp6 + 1); 829 u_int8_t nxt = eip6->ip6_nxt; 830 int eoff = off + sizeof(struct icmp6_hdr) + 831 sizeof(struct ip6_hdr); 832 struct ip6ctlparam ip6cp; 833 struct in6_addr *finaldst = NULL; 834 int icmp6type = icmp6->icmp6_type; 835 struct ip6_frag *fh; 836 struct ip6_rthdr *rth; 837 struct ip6_rthdr0 *rth0; 838 int rthlen; 839 840 while (1) { /* XXX: should avoid inf. loop explicitly? */ 841 struct ip6_ext *eh; 842 843 switch(nxt) { 844 case IPPROTO_HOPOPTS: 845 case IPPROTO_DSTOPTS: 846 case IPPROTO_AH: 847#ifndef PULLDOWN_TEST 848 IP6_EXTHDR_CHECK(m, 0, eoff + 849 sizeof(struct ip6_ext), 850 IPPROTO_DONE); 851 eh = (struct ip6_ext *)(mtod(m, caddr_t) 852 + eoff); 853#else 854 IP6_EXTHDR_GET(eh, struct ip6_ext *, m, 855 eoff, sizeof(*eh)); 856 if (eh == NULL) { 857 icmp6stat.icp6s_tooshort++; 858 return IPPROTO_DONE; 859 } 860#endif 861 862 if (nxt == IPPROTO_AH) 863 eoff += (eh->ip6e_len + 2) << 2; 864 else 865 eoff += (eh->ip6e_len + 1) << 3; 866 nxt = eh->ip6e_nxt; 867 break; 868 case IPPROTO_ROUTING: 869 /* 870 * When the erroneous packet contains a 871 * routing header, we should examine the 872 * header to determine the final destination. 873 * Otherwise, we can't properly update 874 * information that depends on the final 875 * destination (e.g. path MTU). 876 */ 877#ifndef PULLDOWN_TEST 878 IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(*rth), 879 IPPROTO_DONE); 880 rth = (struct ip6_rthdr *)(mtod(m, caddr_t) 881 + eoff); 882#else 883 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m, 884 eoff, sizeof(*rth)); 885 if (rth == NULL) { 886 icmp6stat.icp6s_tooshort++; 887 return IPPROTO_DONE; 888 } 889#endif 890 rthlen = (rth->ip6r_len + 1) << 3; 891 /* 892 * XXX: currently there is no 893 * officially defined type other 894 * than type-0. 895 * Note that if the segment left field 896 * is 0, all intermediate hops must 897 * have been passed. 898 */ 899 if (rth->ip6r_segleft && 900 rth->ip6r_type == IPV6_RTHDR_TYPE_0) { 901 int hops; 902 903#ifndef PULLDOWN_TEST 904 IP6_EXTHDR_CHECK(m, 0, eoff + rthlen, 905 IPPROTO_DONE); 906 rth0 = (struct ip6_rthdr0 *)(mtod(m, caddr_t) + eoff); 907#else 908 IP6_EXTHDR_GET(rth0, 909 struct ip6_rthdr0 *, m, 910 eoff, rthlen); 911 if (rth0 == NULL) { 912 icmp6stat.icp6s_tooshort++; 913 return IPPROTO_DONE; 914 } 915#endif 916 /* just ignore a bogus header */ 917 if ((rth0->ip6r0_len % 2) == 0 && 918 (hops = rth0->ip6r0_len/2)) 919 finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1); 920 } 921 eoff += rthlen; 922 nxt = rth->ip6r_nxt; 923 break; 924 case IPPROTO_FRAGMENT: 925#ifndef PULLDOWN_TEST 926 IP6_EXTHDR_CHECK(m, 0, eoff + 927 sizeof(struct ip6_frag), 928 IPPROTO_DONE); 929 fh = (struct ip6_frag *)(mtod(m, caddr_t) 930 + eoff); 931#else 932 IP6_EXTHDR_GET(fh, struct ip6_frag *, m, 933 eoff, sizeof(*fh)); 934 if (fh == NULL) { 935 icmp6stat.icp6s_tooshort++; 936 return IPPROTO_DONE; 937 } 938#endif 939 /* 940 * Data after a fragment header is meaningless 941 * unless it is the first fragment, but 942 * we'll go to the notify label for path MTU 943 * discovery. 944 */ 945 if (fh->ip6f_offlg & IP6F_OFF_MASK) 946 goto notify; 947 948 eoff += sizeof(struct ip6_frag); 949 nxt = fh->ip6f_nxt; 950 break; 951 default: 952 /* 953 * This case includes ESP and the No Next 954 * Header. In such cases going to the notify 955 * label does not have any meaning 956 * (i.e. ctlfunc will be NULL), but we go 957 * anyway since we might have to update 958 * path MTU information. 959 */ 960 goto notify; 961 } 962 } 963 notify: 964#ifndef PULLDOWN_TEST 965 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 966#else 967 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 968 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 969 if (icmp6 == NULL) { 970 icmp6stat.icp6s_tooshort++; 971 return IPPROTO_DONE; 972 } 973#endif 974 if (icmp6type == ICMP6_PACKET_TOO_BIG) { 975 if (finaldst == NULL) 976 finaldst = &((struct ip6_hdr *)(icmp6 + 1))->ip6_dst; 977 icmp6_mtudisc_update(finaldst, icmp6, m); 978 } 979 980 ctlfunc = (void (*) __P((int, struct sockaddr *, void *))) 981 (inet6sw[ip6_protox[nxt]].pr_ctlinput); 982 if (ctlfunc) { 983 ip6cp.ip6c_m = m; 984 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1); 985 ip6cp.ip6c_off = eoff; 986 (*ctlfunc)(code, (struct sockaddr *)&icmp6src, &ip6cp); 987 } 988 } 989 break; 990 991 badcode: 992 icmp6stat.icp6s_badcode++; 993 break; 994 995 badlen: 996 icmp6stat.icp6s_badlen++; 997 break; 998 } 999 1000 icmp6_rip6_input(&m, *offp); 1001 return IPPROTO_DONE; 1002 1003 freeit: 1004 m_freem(m); 1005 return IPPROTO_DONE; 1006} 1007 1008static void 1009icmp6_mtudisc_update(dst, icmp6, m) 1010 struct in6_addr *dst; 1011 struct icmp6_hdr *icmp6;/* we can assume the validity of the pointer */ 1012 struct mbuf *m; /* currently unused but added for scoped addrs */ 1013{ 1014 u_int mtu = ntohl(icmp6->icmp6_mtu); 1015 struct rtentry *rt = NULL; 1016 struct sockaddr_in6 sin6; 1017 1018 bzero(&sin6, sizeof(sin6)); 1019 sin6.sin6_family = PF_INET6; 1020 sin6.sin6_len = sizeof(struct sockaddr_in6); 1021 sin6.sin6_addr = *dst; 1022 /* sin6.sin6_scope_id = XXX: should be set if DST is a scoped addr */ 1023 rt = rtalloc1((struct sockaddr *)&sin6, 1); /*clone*/ 1024 if (!rt || (rt->rt_flags & RTF_HOST) == 0) { 1025 if (rt) 1026 RTFREE(rt); 1027 rt = icmp6_mtudisc_clone((struct sockaddr *)&sin6); 1028 } 1029 1030 if (rt && (rt->rt_flags & RTF_HOST) 1031 && !(rt->rt_rmx.rmx_locks & RTV_MTU)) { 1032 if (mtu < IPV6_MMTU) { 1033 /* xxx */ 1034 rt->rt_rmx.rmx_locks |= RTV_MTU; 1035 } else if (mtu < rt->rt_ifp->if_mtu && 1036 rt->rt_rmx.rmx_mtu > mtu) { 1037 rt->rt_rmx.rmx_mtu = mtu; 1038 } 1039 } 1040 if (rt) 1041 RTFREE(rt); 1042} 1043 1044/* 1045 * Process a Node Information Query packet, (roughly) based on 1046 * draft-ietf-ipngwg-icmp-name-lookups-05. 1047 * 1048 * Spec incompatibilities: 1049 * - IPv6 Subject address handling 1050 * - IPv4 Subject address handling support missing 1051 * - Proxy reply (answer even if it's not for me) 1052 * - "Supported Qtypes" support missing 1053 * - joins NI group address at in6_ifattach() time only, does not cope 1054 * with hostname changes by sethostname(3) 1055 */ 1056#ifndef offsetof /* XXX */ 1057#define offsetof(type, member) ((size_t)(&((type *)0)->member)) 1058#endif 1059static struct mbuf * 1060ni6_input(m, off) 1061 struct mbuf *m; 1062 int off; 1063{ 1064 struct icmp6_nodeinfo *ni6, *nni6; 1065 struct mbuf *n = NULL; 1066 u_int16_t qtype; 1067 int subjlen; 1068 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1069 struct ni_reply_fqdn *fqdn; 1070 int addrs; /* for NI_QTYPE_NODEADDR */ 1071 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */ 1072 struct sockaddr_in6 sin6; 1073 struct ip6_hdr *ip6; 1074 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */ 1075 char *subj; 1076 1077 ip6 = mtod(m, struct ip6_hdr *); 1078#ifndef PULLDOWN_TEST 1079 ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off); 1080#else 1081 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6)); 1082 if (ni6 == NULL) { 1083 /* m is already reclaimed */ 1084 return NULL; 1085 } 1086#endif 1087 1088 /* 1089 * Validate IPv6 destination address. 1090 * 1091 * We accept packets with the following IPv6 destination address: 1092 * - Responder's unicast/anycast address, 1093 * - link-local multicast address 1094 * This is a violation to last paragraph in icmp-name-lookups-05 1095 * page 4, which restricts IPv6 destination address of a query to: 1096 * - Responder's unicast/anycast address, 1097 * - NI group address for a name belongs to the Responder, or 1098 * - NI group address for a name for which the Responder is providing 1099 * proxy service. 1100 * (note: NI group address is a link-local multicast address) 1101 * 1102 * We allow any link-local multicast address, since "ping6 -w ff02::1" 1103 * has been really useful for us debugging our network. Also this is 1104 * still questionable if the restriction in spec buy us security at all, 1105 * since RFC2463 permits echo packet to multicast destination. 1106 * Even if we forbid NI query to ff02::1, we can effectively get the 1107 * same result as "ping6 -w ff02::1" by the following steps: 1108 * - run "ping6 ff02::1", then 1109 * - run "ping6 -w" for all addresses replied. 1110 */ 1111 bzero(&sin6, sizeof(sin6)); 1112 sin6.sin6_family = AF_INET6; 1113 sin6.sin6_len = sizeof(struct sockaddr_in6); 1114 bcopy(&ip6->ip6_dst, &sin6.sin6_addr, sizeof(sin6.sin6_addr)); 1115 /* XXX scopeid */ 1116 if (ifa_ifwithaddr((struct sockaddr *)&sin6)) 1117 ; /*unicast/anycast, fine*/ 1118 else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr)) 1119 ; /*violates spec slightly, see above*/ 1120 else 1121 goto bad; 1122 1123 /* guess reply length */ 1124 qtype = ntohs(ni6->ni_qtype); 1125 switch (qtype) { 1126 case NI_QTYPE_NOOP: 1127 break; /* no reply data */ 1128 case NI_QTYPE_SUPTYPES: 1129 goto bad; /* xxx: to be implemented */ 1130 break; 1131 case NI_QTYPE_FQDN: 1132 /* XXX will append a mbuf */ 1133 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1134 break; 1135 case NI_QTYPE_NODEADDR: 1136 addrs = ni6_addrs(ni6, m, &ifp); 1137 if ((replylen += addrs * sizeof(struct in6_addr)) > MCLBYTES) 1138 replylen = MCLBYTES; /* XXX: we'll truncate later */ 1139 break; 1140 default: 1141 /* 1142 * XXX: We must return a reply with the ICMP6 code 1143 * `unknown Qtype' in this case. However we regard the case 1144 * as an FQDN query for backward compatibility. 1145 * Older versions set a random value to this field, 1146 * so it rarely varies in the defined qtypes. 1147 * But the mechanism is not reliable... 1148 * maybe we should obsolete older versions. 1149 */ 1150 qtype = NI_QTYPE_FQDN; 1151 /* XXX will append a mbuf */ 1152 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1153 oldfqdn++; 1154 break; 1155 } 1156 1157 /* validate query Subject field. */ 1158 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo); 1159 switch (qtype) { 1160 case NI_QTYPE_NOOP: 1161 case NI_QTYPE_SUPTYPES: 1162 if (subjlen != 0) 1163 goto bad; 1164 break; 1165 1166 case NI_QTYPE_FQDN: 1167 case NI_QTYPE_NODEADDR: 1168 switch (ni6->ni_code) { 1169 case ICMP6_NI_SUBJ_IPV6: 1170#if ICMP6_NI_SUBJ_IPV6 != 0 1171 case 0: 1172#endif 1173 /* 1174 * backward compatibility - try to accept 03 draft 1175 * format, where no Subject is present. 1176 */ 1177 if (subjlen == 0) { 1178 oldfqdn++; 1179 break; 1180 } 1181 1182 if (subjlen != sizeof(sin6.sin6_addr)) 1183 goto bad; 1184 1185 /* 1186 * Validate Subject address. 1187 * 1188 * Not sure what exactly does "address belongs to the 1189 * node" mean in the spec, is it just unicast, or what? 1190 * 1191 * At this moment we consider Subject address as 1192 * "belong to the node" if the Subject address equals 1193 * to the IPv6 destination address; validation for 1194 * IPv6 destination address should have done enough 1195 * check for us. 1196 * 1197 * We do not do proxy at this moment. 1198 */ 1199 /* m_pulldown instead of copy? */ 1200 m_copydata(m, off + sizeof(struct icmp6_nodeinfo), 1201 subjlen, (caddr_t)&sin6.sin6_addr); 1202 /* XXX kame scope hack */ 1203 if (IN6_IS_SCOPE_LINKLOCAL(&sin6.sin6_addr)) { 1204#ifdef FAKE_LOOPBACK_IF 1205 if ((m->m_flags & M_PKTHDR) != 0 && 1206 m->m_pkthdr.rcvif) { 1207 sin6.sin6_addr.s6_addr16[1] = 1208 htons(m->m_pkthdr.rcvif->if_index); 1209 } 1210#else 1211 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 1212 sin6.sin6_addr.s6_addr16[1] = 1213 ip6->ip6_dst.s6_addr16[1]; 1214 } 1215#endif 1216 } 1217 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &sin6.sin6_addr)) 1218 break; 1219 /* 1220 * XXX if we are to allow other cases, we should really 1221 * be careful about scope here. 1222 * basically, we should disallow queries toward IPv6 1223 * destination X with subject Y, if scope(X) > scope(Y). 1224 * if we allow scope(X) > scope(Y), it will result in 1225 * information leakage across scope boundary. 1226 */ 1227 goto bad; 1228 1229 case ICMP6_NI_SUBJ_FQDN: 1230 /* 1231 * Validate Subject name with gethostname(3). 1232 * 1233 * The behavior may need some debate, since: 1234 * - we are not sure if the node has FQDN as 1235 * hostname (returned by gethostname(3)). 1236 * - the code does wildcard match for truncated names. 1237 * however, we are not sure if we want to perform 1238 * wildcard match, if gethostname(3) side has 1239 * truncated hostname. 1240 */ 1241 n = ni6_nametodns(hostname, hostnamelen, 0); 1242 if (!n || n->m_next || n->m_len == 0) 1243 goto bad; 1244 IP6_EXTHDR_GET(subj, char *, m, 1245 off + sizeof(struct icmp6_nodeinfo), subjlen); 1246 if (subj == NULL) 1247 goto bad; 1248 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *), 1249 n->m_len)) { 1250 goto bad; 1251 } 1252 m_freem(n); 1253 n = NULL; 1254 break; 1255 1256 case ICMP6_NI_SUBJ_IPV4: /* xxx: to be implemented? */ 1257 default: 1258 goto bad; 1259 } 1260 break; 1261 1262 default: 1263 /* should never be here due to "switch (qtype)" above */ 1264 goto bad; 1265 } 1266 1267 /* allocate a mbuf to reply. */ 1268 MGETHDR(n, M_DONTWAIT, m->m_type); 1269 if (n == NULL) { 1270 m_freem(m); 1271 return(NULL); 1272 } 1273 M_COPY_PKTHDR(n, m); /* just for recvif */ 1274 if (replylen > MHLEN) { 1275 if (replylen > MCLBYTES) { 1276 /* 1277 * XXX: should we try to allocate more? But MCLBYTES is 1278 * probably much larger than IPV6_MMTU... 1279 */ 1280 goto bad; 1281 } 1282 MCLGET(n, M_DONTWAIT); 1283 if ((n->m_flags & M_EXT) == 0) { 1284 goto bad; 1285 } 1286 } 1287 n->m_pkthdr.len = n->m_len = replylen; 1288 1289 /* copy mbuf header and IPv6 + Node Information base headers */ 1290 bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr)); 1291 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1); 1292 bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo)); 1293 1294 /* qtype dependent procedure */ 1295 switch (qtype) { 1296 case NI_QTYPE_NOOP: 1297 nni6->ni_flags = 0; 1298 break; 1299 case NI_QTYPE_SUPTYPES: 1300 goto bad; /* xxx: to be implemented */ 1301 break; 1302 case NI_QTYPE_FQDN: 1303 fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) + 1304 sizeof(struct ip6_hdr) + 1305 sizeof(struct icmp6_nodeinfo)); 1306 nni6->ni_flags = 0; /* XXX: meaningless TTL */ 1307 fqdn->ni_fqdn_ttl = 0; /* ditto. */ 1308 /* 1309 * XXX do we really have FQDN in variable "hostname"? 1310 */ 1311 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn); 1312 if (n->m_next == NULL) 1313 goto bad; 1314 /* XXX we assume that n->m_next is not a chain */ 1315 if (n->m_next->m_next != NULL) 1316 goto bad; 1317 n->m_pkthdr.len += n->m_next->m_len; 1318 break; 1319 case NI_QTYPE_NODEADDR: 1320 { 1321 int lenlim, copied; 1322 1323 if (n->m_flags & M_EXT) 1324 lenlim = MCLBYTES - sizeof(struct ip6_hdr) - 1325 sizeof(struct icmp6_nodeinfo); 1326 else 1327 lenlim = MHLEN - sizeof(struct ip6_hdr) - 1328 sizeof(struct icmp6_nodeinfo); 1329 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim); 1330 /* XXX: reset mbuf length */ 1331 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 1332 sizeof(struct icmp6_nodeinfo) + copied; 1333 break; 1334 } 1335 default: 1336 break; /* XXX impossible! */ 1337 } 1338 1339 nni6->ni_type = ICMP6_NI_REPLY; 1340 nni6->ni_code = ICMP6_NI_SUCESS; 1341 m_freem(m); 1342 return(n); 1343 1344 bad: 1345 m_freem(m); 1346 if (n) 1347 m_freem(n); 1348 return(NULL); 1349} 1350#undef hostnamelen 1351 1352/* 1353 * make a mbuf with DNS-encoded string. no compression support. 1354 * 1355 * XXX names with less than 2 dots (like "foo" or "foo.section") will be 1356 * treated as truncated name (two \0 at the end). this is a wild guess. 1357 */ 1358static struct mbuf * 1359ni6_nametodns(name, namelen, old) 1360 const char *name; 1361 int namelen; 1362 int old; /* return pascal string if non-zero */ 1363{ 1364 struct mbuf *m; 1365 char *cp, *ep; 1366 const char *p, *q; 1367 int i, len, nterm; 1368 1369 if (old) 1370 len = namelen + 1; 1371 else 1372 len = MCLBYTES; 1373 1374 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */ 1375 MGET(m, M_DONTWAIT, MT_DATA); 1376 if (m && len > MLEN) { 1377 MCLGET(m, M_DONTWAIT); 1378 if ((m->m_flags & M_EXT) == 0) 1379 goto fail; 1380 } 1381 if (!m) 1382 goto fail; 1383 m->m_next = NULL; 1384 1385 if (old) { 1386 m->m_len = len; 1387 *mtod(m, char *) = namelen; 1388 bcopy(name, mtod(m, char *) + 1, namelen); 1389 return m; 1390 } else { 1391 m->m_len = 0; 1392 cp = mtod(m, char *); 1393 ep = mtod(m, char *) + M_TRAILINGSPACE(m); 1394 1395 /* if not certain about my name, return empty buffer */ 1396 if (namelen == 0) 1397 return m; 1398 1399 /* 1400 * guess if it looks like shortened hostname, or FQDN. 1401 * shortened hostname needs two trailing "\0". 1402 */ 1403 i = 0; 1404 for (p = name; p < name + namelen; p++) { 1405 if (*p && *p == '.') 1406 i++; 1407 } 1408 if (i < 2) 1409 nterm = 2; 1410 else 1411 nterm = 1; 1412 1413 p = name; 1414 while (cp < ep && p < name + namelen) { 1415 i = 0; 1416 for (q = p; q < name + namelen && *q && *q != '.'; q++) 1417 i++; 1418 /* result does not fit into mbuf */ 1419 if (cp + i + 1 >= ep) 1420 goto fail; 1421 /* DNS label length restriction, RFC1035 page 8 */ 1422 if (i >= 64) 1423 goto fail; 1424 *cp++ = i; 1425 bcopy(p, cp, i); 1426 cp += i; 1427 p = q; 1428 if (p < name + namelen && *p == '.') 1429 p++; 1430 } 1431 /* termination */ 1432 if (cp + nterm >= ep) 1433 goto fail; 1434 while (nterm-- > 0) 1435 *cp++ = '\0'; 1436 m->m_len = cp - mtod(m, char *); 1437 return m; 1438 } 1439 1440 panic("should not reach here"); 1441 /*NOTREACHED*/ 1442 1443 fail: 1444 if (m) 1445 m_freem(m); 1446 return NULL; 1447} 1448 1449/* 1450 * check if two DNS-encoded string matches. takes care of truncated 1451 * form (with \0\0 at the end). no compression support. 1452 */ 1453static int 1454ni6_dnsmatch(a, alen, b, blen) 1455 const char *a; 1456 int alen; 1457 const char *b; 1458 int blen; 1459{ 1460 const char *a0, *b0; 1461 int l; 1462 1463 /* simplest case - need validation? */ 1464 if (alen == blen && bcmp(a, b, alen) == 0) 1465 return 1; 1466 1467 a0 = a; 1468 b0 = b; 1469 1470 /* termination is mandatory */ 1471 if (alen < 2 || blen < 2) 1472 return 0; 1473 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0') 1474 return 0; 1475 alen--; 1476 blen--; 1477 1478 while (a - a0 < alen && b - b0 < blen) { 1479 if (a - a0 + 1 > alen || b - b0 + 1 > blen) 1480 return 0; 1481 1482 if ((signed char)a[0] < 0 || (signed char)b[0] < 0) 1483 return 0; 1484 /* we don't support compression yet */ 1485 if (a[0] >= 64 || b[0] >= 64) 1486 return 0; 1487 1488 /* truncated case */ 1489 if (a[0] == 0 && a - a0 == alen - 1) 1490 return 1; 1491 if (b[0] == 0 && b - b0 == blen - 1) 1492 return 1; 1493 if (a[0] == 0 || b[0] == 0) 1494 return 0; 1495 1496 if (a[0] != b[0]) 1497 return 0; 1498 l = a[0]; 1499 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen) 1500 return 0; 1501 if (bcmp(a + 1, b + 1, l) != 0) 1502 return 0; 1503 1504 a += 1 + l; 1505 b += 1 + l; 1506 } 1507 1508 if (a - a0 == alen && b - b0 == blen) 1509 return 1; 1510 else 1511 return 0; 1512} 1513 1514/* 1515 * calculate the number of addresses to be returned in the node info reply. 1516 */ 1517static int 1518ni6_addrs(ni6, m, ifpp) 1519 struct icmp6_nodeinfo *ni6; 1520 struct mbuf *m; 1521 struct ifnet **ifpp; 1522{ 1523 register struct ifnet *ifp; 1524 register struct in6_ifaddr *ifa6; 1525 register struct ifaddr *ifa; 1526 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1527 int addrs = 0, addrsofif, iffound = 0; 1528 1529 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) 1530 { 1531 addrsofif = 0; 1532 for (ifa = ifp->if_addrlist.tqh_first; ifa; 1533 ifa = ifa->ifa_list.tqe_next) 1534 { 1535 if (ifa->ifa_addr->sa_family != AF_INET6) 1536 continue; 1537 ifa6 = (struct in6_ifaddr *)ifa; 1538 1539 if (!(ni6->ni_flags & NI_NODEADDR_FLAG_ALL) && 1540 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 1541 &ifa6->ia_addr.sin6_addr)) 1542 iffound = 1; 1543 1544 /* 1545 * IPv4-mapped addresses can only be returned by a 1546 * Node Information proxy, since they represent 1547 * addresses of IPv4-only nodes, which perforce do 1548 * not implement this protocol. 1549 * [icmp-name-lookups-05] 1550 * So we don't support NI_NODEADDR_FLAG_COMPAT in 1551 * this function at this moment. 1552 */ 1553 1554 if (ifa6->ia6_flags & IN6_IFF_ANYCAST) 1555 continue; /* we need only unicast addresses */ 1556 1557 if ((ni6->ni_flags & (NI_NODEADDR_FLAG_LINKLOCAL | 1558 NI_NODEADDR_FLAG_SITELOCAL | 1559 NI_NODEADDR_FLAG_GLOBAL)) == 0) 1560 continue; 1561 1562 /* What do we have to do about ::1? */ 1563 switch(in6_addrscope(&ifa6->ia_addr.sin6_addr)) { 1564 case IPV6_ADDR_SCOPE_LINKLOCAL: 1565 if (ni6->ni_flags & NI_NODEADDR_FLAG_LINKLOCAL) 1566 addrsofif++; 1567 break; 1568 case IPV6_ADDR_SCOPE_SITELOCAL: 1569 if (ni6->ni_flags & NI_NODEADDR_FLAG_SITELOCAL) 1570 addrsofif++; 1571 break; 1572 case IPV6_ADDR_SCOPE_GLOBAL: 1573 if (ni6->ni_flags & NI_NODEADDR_FLAG_GLOBAL) 1574 addrsofif++; 1575 break; 1576 default: 1577 continue; 1578 } 1579 } 1580 if (iffound) { 1581 *ifpp = ifp; 1582 return(addrsofif); 1583 } 1584 1585 addrs += addrsofif; 1586 } 1587 1588 return(addrs); 1589} 1590 1591static int 1592ni6_store_addrs(ni6, nni6, ifp0, resid) 1593 struct icmp6_nodeinfo *ni6, *nni6; 1594 struct ifnet *ifp0; 1595 int resid; 1596{ 1597 register struct ifnet *ifp = ifp0 ? ifp0 : TAILQ_FIRST(&ifnet); 1598 register struct in6_ifaddr *ifa6; 1599 register struct ifaddr *ifa; 1600 int docopy, copied = 0; 1601 u_char *cp = (u_char *)(nni6 + 1); 1602 1603 if (ifp0 == NULL && !(ni6->ni_flags & NI_NODEADDR_FLAG_ALL)) 1604 return(0); /* needless to copy */ 1605 1606 for (; ifp; ifp = TAILQ_NEXT(ifp, if_list)) 1607 { 1608 for (ifa = ifp->if_addrlist.tqh_first; ifa; 1609 ifa = ifa->ifa_list.tqe_next) 1610 { 1611 docopy = 0; 1612 1613 if (ifa->ifa_addr->sa_family != AF_INET6) 1614 continue; 1615 ifa6 = (struct in6_ifaddr *)ifa; 1616 1617 if (ifa6->ia6_flags & IN6_IFF_ANYCAST) { 1618 /* just experimental. not in the spec. */ 1619 if (ni6->ni_flags & NI_NODEADDR_FLAG_ANYCAST) 1620 docopy = 1; 1621 else 1622 continue; 1623 } 1624 else { /* unicast address */ 1625 if (ni6->ni_flags & NI_NODEADDR_FLAG_ANYCAST) 1626 continue; 1627 else 1628 docopy = 1; 1629 } 1630 1631 /* What do we have to do about ::1? */ 1632 switch(in6_addrscope(&ifa6->ia_addr.sin6_addr)) { 1633 case IPV6_ADDR_SCOPE_LINKLOCAL: 1634 if (ni6->ni_flags & NI_NODEADDR_FLAG_LINKLOCAL) 1635 docopy = 1; 1636 break; 1637 case IPV6_ADDR_SCOPE_SITELOCAL: 1638 if (ni6->ni_flags & NI_NODEADDR_FLAG_SITELOCAL) 1639 docopy = 1; 1640 break; 1641 case IPV6_ADDR_SCOPE_GLOBAL: 1642 if (ni6->ni_flags & NI_NODEADDR_FLAG_GLOBAL) 1643 docopy = 1; 1644 break; 1645 default: 1646 continue; 1647 } 1648 1649 if (docopy) { 1650 if (resid < sizeof(struct in6_addr)) { 1651 /* 1652 * We give up much more copy. 1653 * Set the truncate flag and return. 1654 */ 1655 nni6->ni_flags |= 1656 NI_NODEADDR_FLAG_TRUNCATE; 1657 return(copied); 1658 } 1659 bcopy(&ifa6->ia_addr.sin6_addr, cp, 1660 sizeof(struct in6_addr)); 1661 /* XXX: KAME link-local hack; remove ifindex */ 1662 if (IN6_IS_ADDR_LINKLOCAL(&ifa6->ia_addr.sin6_addr)) 1663 ((struct in6_addr *)cp)->s6_addr16[1] = 0; 1664 cp += sizeof(struct in6_addr); 1665 resid -= sizeof(struct in6_addr); 1666 copied += sizeof(struct in6_addr); 1667 } 1668 } 1669 if (ifp0) /* we need search only on the specified IF */ 1670 break; 1671 } 1672 1673 return(copied); 1674} 1675 1676/* 1677 * XXX almost dup'ed code with rip6_input. 1678 */ 1679static int 1680icmp6_rip6_input(mp, off) 1681 struct mbuf **mp; 1682 int off; 1683{ 1684 struct mbuf *m = *mp; 1685 register struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1686 register struct in6pcb *in6p; 1687 struct in6pcb *last = NULL; 1688 struct sockaddr_in6 rip6src; 1689 struct icmp6_hdr *icmp6; 1690 struct mbuf *opts = NULL; 1691 1692#ifndef PULLDOWN_TEST 1693 /* this is assumed to be safe. */ 1694 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off); 1695#else 1696 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 1697 if (icmp6 == NULL) { 1698 /* m is already reclaimed */ 1699 return IPPROTO_DONE; 1700 } 1701#endif 1702 1703 bzero(&rip6src, sizeof(rip6src)); 1704 rip6src.sin6_len = sizeof(struct sockaddr_in6); 1705 rip6src.sin6_family = AF_INET6; 1706 /* KAME hack: recover scopeid */ 1707 (void)in6_recoverscope(&rip6src, &ip6->ip6_src, m->m_pkthdr.rcvif); 1708 1709 for (in6p = rawin6pcb.in6p_next; 1710 in6p != &rawin6pcb; in6p = in6p->in6p_next) 1711 { 1712 if (in6p->in6p_ip6_nxt != IPPROTO_ICMPV6) 1713 continue; 1714 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && 1715 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst)) 1716 continue; 1717 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) && 1718 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src)) 1719 continue; 1720 if (in6p->in6p_icmp6filt 1721 && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type, 1722 in6p->in6p_icmp6filt)) 1723 continue; 1724 if (last) { 1725 struct mbuf *n; 1726 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { 1727 if (last->in6p_flags & IN6P_CONTROLOPTS) 1728 ip6_savecontrol(last, &opts, ip6, n); 1729 /* strip intermediate headers */ 1730 m_adj(n, off); 1731 if (sbappendaddr(&last->in6p_socket->so_rcv, 1732 (struct sockaddr *)&rip6src, 1733 n, opts) == 0) { 1734 /* should notify about lost packet */ 1735 m_freem(n); 1736 if (opts) 1737 m_freem(opts); 1738 } else 1739 sorwakeup(last->in6p_socket); 1740 opts = NULL; 1741 } 1742 } 1743 last = in6p; 1744 } 1745 if (last) { 1746 if (last->in6p_flags & IN6P_CONTROLOPTS) 1747 ip6_savecontrol(last, &opts, ip6, m); 1748 /* strip intermediate headers */ 1749 m_adj(m, off); 1750 if (sbappendaddr(&last->in6p_socket->so_rcv, 1751 (struct sockaddr *)&rip6src, m, opts) == 0) { 1752 m_freem(m); 1753 if (opts) 1754 m_freem(opts); 1755 } else 1756 sorwakeup(last->in6p_socket); 1757 } else { 1758 m_freem(m); 1759 ip6stat.ip6s_delivered--; 1760 } 1761 return IPPROTO_DONE; 1762} 1763 1764/* 1765 * Reflect the ip6 packet back to the source. 1766 * OFF points to the icmp6 header, counted from the top of the mbuf. 1767 */ 1768void 1769icmp6_reflect(m, off) 1770 struct mbuf *m; 1771 size_t off; 1772{ 1773 struct ip6_hdr *ip6; 1774 struct icmp6_hdr *icmp6; 1775 struct in6_ifaddr *ia; 1776 struct in6_addr t, *src = 0; 1777 int plen; 1778 int type, code; 1779 struct ifnet *outif = NULL; 1780#ifdef COMPAT_RFC1885 1781 int mtu = IPV6_MMTU; 1782 struct sockaddr_in6 *sin6 = &icmp6_reflect_rt.ro_dst; 1783#endif 1784 1785 /* too short to reflect */ 1786 if (off < sizeof(struct ip6_hdr)) { 1787 printf("sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n", 1788 (u_long)off, (u_long)sizeof(struct ip6_hdr), 1789 __FILE__, __LINE__); 1790 goto bad; 1791 } 1792 1793 /* 1794 * If there are extra headers between IPv6 and ICMPv6, strip 1795 * off that header first. 1796 */ 1797#ifdef DIAGNOSTIC 1798 if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN) 1799 panic("assumption failed in icmp6_reflect"); 1800#endif 1801 if (off > sizeof(struct ip6_hdr)) { 1802 size_t l; 1803 struct ip6_hdr nip6; 1804 1805 l = off - sizeof(struct ip6_hdr); 1806 m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6); 1807 m_adj(m, l); 1808 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 1809 if (m->m_len < l) { 1810 if ((m = m_pullup(m, l)) == NULL) 1811 return; 1812 } 1813 bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6)); 1814 } else /* off == sizeof(struct ip6_hdr) */ { 1815 size_t l; 1816 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 1817 if (m->m_len < l) { 1818 if ((m = m_pullup(m, l)) == NULL) 1819 return; 1820 } 1821 } 1822 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr); 1823 ip6 = mtod(m, struct ip6_hdr *); 1824 ip6->ip6_nxt = IPPROTO_ICMPV6; 1825 icmp6 = (struct icmp6_hdr *)(ip6 + 1); 1826 type = icmp6->icmp6_type; /* keep type for statistics */ 1827 code = icmp6->icmp6_code; /* ditto. */ 1828 1829 t = ip6->ip6_dst; 1830 /* 1831 * ip6_input() drops a packet if its src is multicast. 1832 * So, the src is never multicast. 1833 */ 1834 ip6->ip6_dst = ip6->ip6_src; 1835 1836 /* XXX hack for link-local addresses */ 1837 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) 1838 ip6->ip6_dst.s6_addr16[1] = 1839 htons(m->m_pkthdr.rcvif->if_index); 1840 if (IN6_IS_ADDR_LINKLOCAL(&t)) 1841 t.s6_addr16[1] = htons(m->m_pkthdr.rcvif->if_index); 1842 1843#ifdef COMPAT_RFC1885 1844 /* 1845 * xxx guess MTU 1846 * RFC 1885 requires that echo reply should be truncated if it 1847 * does not fit in with (return) path MTU, but the description was 1848 * removed in the new spec. 1849 */ 1850 if (icmp6_reflect_rt.ro_rt == 0 || 1851 ! (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &ip6->ip6_dst))) { 1852 if (icmp6_reflect_rt.ro_rt) { 1853 icmp6_reflect_rt.ro_rt = 0; 1854 } 1855 bzero(sin6, sizeof(*sin6)); 1856 sin6->sin6_family = PF_INET6; 1857 sin6->sin6_len = sizeof(struct sockaddr_in6); 1858 sin6->sin6_addr = ip6->ip6_dst; 1859 1860 rtalloc((struct route *)&icmp6_reflect_rt.ro_rt); 1861 } 1862 1863 if (icmp6_reflect_rt.ro_rt == 0) 1864 goto bad; 1865 1866 if ((icmp6_reflect_rt.ro_rt->rt_flags & RTF_HOST) 1867 && mtu < icmp6_reflect_rt.ro_rt->rt_ifp->if_mtu) 1868 mtu = icmp6_reflect_rt.ro_rt->rt_rmx.rmx_mtu; 1869 1870 if (mtu < m->m_pkthdr.len) { 1871 plen -= (m->m_pkthdr.len - mtu); 1872 m_adj(m, mtu - m->m_pkthdr.len); 1873 } 1874#endif 1875 /* 1876 * If the incoming packet was addressed directly to us(i.e. unicast), 1877 * use dst as the src for the reply. 1878 * The IN6_IFF_NOTREADY case would be VERY rare, but is possible 1879 * (for example) when we encounter an error while forwarding procedure 1880 * destined to a duplicated address of ours. 1881 */ 1882 for (ia = in6_ifaddr; ia; ia = ia->ia_next) 1883 if (IN6_ARE_ADDR_EQUAL(&t, &ia->ia_addr.sin6_addr) && 1884 (ia->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) { 1885 src = &t; 1886 break; 1887 } 1888 if (ia == NULL && IN6_IS_ADDR_LINKLOCAL(&t) && (m->m_flags & M_LOOP)) { 1889 /* 1890 * This is the case if the dst is our link-local address 1891 * and the sender is also ourseleves. 1892 */ 1893 src = &t; 1894 } 1895 1896 if (src == 0) 1897 /* 1898 * This case matches to multicasts, our anycast, or unicasts 1899 * that we do not own. Select a source address which has the 1900 * same scope. 1901 * XXX: for (non link-local) multicast addresses, this might 1902 * not be a good choice. 1903 */ 1904 if ((ia = in6_ifawithscope(m->m_pkthdr.rcvif, &t)) != 0) 1905 src = &IA6_SIN6(ia)->sin6_addr; 1906 1907 if (src == 0) 1908 goto bad; 1909 1910 ip6->ip6_src = *src; 1911 1912 ip6->ip6_flow = 0; 1913 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 1914 ip6->ip6_vfc |= IPV6_VERSION; 1915 ip6->ip6_nxt = IPPROTO_ICMPV6; 1916 if (m->m_pkthdr.rcvif) { 1917 /* XXX: This may not be the outgoing interface */ 1918 ip6->ip6_hlim = nd_ifinfo[m->m_pkthdr.rcvif->if_index].chlim; 1919 } 1920 1921 icmp6->icmp6_cksum = 0; 1922 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6, 1923 sizeof(struct ip6_hdr), plen); 1924 1925 /* 1926 * xxx option handling 1927 */ 1928 1929 m->m_flags &= ~(M_BCAST|M_MCAST); 1930#ifdef IPSEC 1931 /* Don't lookup socket */ 1932 ipsec_setsocket(m, NULL); 1933#endif /*IPSEC*/ 1934 1935#ifdef COMPAT_RFC1885 1936 ip6_output(m, NULL, &icmp6_reflect_rt, 0, NULL, &outif); 1937#else 1938 ip6_output(m, NULL, NULL, 0, NULL, &outif); 1939#endif 1940 if (outif) 1941 icmp6_ifoutstat_inc(outif, type, code); 1942 1943 return; 1944 1945 bad: 1946 m_freem(m); 1947 return; 1948} 1949 1950void 1951icmp6_fasttimo() 1952{ 1953 1954 mld6_fasttimeo(); 1955} 1956 1957static const char * 1958icmp6_redirect_diag(src6, dst6, tgt6) 1959 struct in6_addr *src6; 1960 struct in6_addr *dst6; 1961 struct in6_addr *tgt6; 1962{ 1963 static char buf[1024]; 1964 snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)", 1965 ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6)); 1966 return buf; 1967} 1968 1969void 1970icmp6_redirect_input(m, off) 1971 register struct mbuf *m; 1972 int off; 1973{ 1974 struct ifnet *ifp = m->m_pkthdr.rcvif; 1975 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1976 struct nd_redirect *nd_rd; 1977 int icmp6len = ntohs(ip6->ip6_plen); 1978 char *lladdr = NULL; 1979 int lladdrlen = 0; 1980 u_char *redirhdr = NULL; 1981 int redirhdrlen = 0; 1982 struct rtentry *rt = NULL; 1983 int is_router; 1984 int is_onlink; 1985 struct in6_addr src6 = ip6->ip6_src; 1986 struct in6_addr redtgt6; 1987 struct in6_addr reddst6; 1988 union nd_opts ndopts; 1989 1990 if (!m || !ifp) 1991 return; 1992 1993 /* XXX if we are router, we don't update route by icmp6 redirect */ 1994 if (ip6_forwarding) 1995 goto freeit; 1996 if (!icmp6_rediraccept) 1997 goto freeit; 1998 1999#ifndef PULLDOWN_TEST 2000 IP6_EXTHDR_CHECK(m, off, icmp6len,); 2001 nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off); 2002#else 2003 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len); 2004 if (nd_rd == NULL) { 2005 icmp6stat.icp6s_tooshort++; 2006 return; 2007 } 2008#endif 2009 redtgt6 = nd_rd->nd_rd_target; 2010 reddst6 = nd_rd->nd_rd_dst; 2011 2012 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 2013 redtgt6.s6_addr16[1] = htons(ifp->if_index); 2014 if (IN6_IS_ADDR_LINKLOCAL(&reddst6)) 2015 reddst6.s6_addr16[1] = htons(ifp->if_index); 2016 2017 /* validation */ 2018 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) { 2019 log(LOG_ERR, 2020 "ICMP6 redirect sent from %s rejected; " 2021 "must be from linklocal\n", ip6_sprintf(&src6)); 2022 goto freeit; 2023 } 2024 if (ip6->ip6_hlim != 255) { 2025 log(LOG_ERR, 2026 "ICMP6 redirect sent from %s rejected; " 2027 "hlim=%d (must be 255)\n", 2028 ip6_sprintf(&src6), ip6->ip6_hlim); 2029 goto freeit; 2030 } 2031 { 2032 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */ 2033 struct sockaddr_in6 sin6; 2034 struct in6_addr *gw6; 2035 2036 bzero(&sin6, sizeof(sin6)); 2037 sin6.sin6_family = AF_INET6; 2038 sin6.sin6_len = sizeof(struct sockaddr_in6); 2039 bcopy(&reddst6, &sin6.sin6_addr, sizeof(reddst6)); 2040 rt = rtalloc1((struct sockaddr *)&sin6, 0); 2041 if (rt) { 2042 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr); 2043 if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) { 2044 log(LOG_ERR, 2045 "ICMP6 redirect rejected; " 2046 "not equal to gw-for-src=%s (must be same): " 2047 "%s\n", 2048 ip6_sprintf(gw6), 2049 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); 2050 RTFREE(rt); 2051 goto freeit; 2052 } 2053 } else { 2054 log(LOG_ERR, 2055 "ICMP6 redirect rejected; " 2056 "no route found for redirect dst: %s\n", 2057 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); 2058 goto freeit; 2059 } 2060 RTFREE(rt); 2061 rt = NULL; 2062 } 2063 if (IN6_IS_ADDR_MULTICAST(&reddst6)) { 2064 log(LOG_ERR, 2065 "ICMP6 redirect rejected; " 2066 "redirect dst must be unicast: %s\n", 2067 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); 2068 goto freeit; 2069 } 2070 2071 is_router = is_onlink = 0; 2072 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 2073 is_router = 1; /* router case */ 2074 if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0) 2075 is_onlink = 1; /* on-link destination case */ 2076 if (!is_router && !is_onlink) { 2077 log(LOG_ERR, 2078 "ICMP6 redirect rejected; " 2079 "neither router case nor onlink case: %s\n", 2080 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); 2081 goto freeit; 2082 } 2083 /* validation passed */ 2084 2085 icmp6len -= sizeof(*nd_rd); 2086 nd6_option_init(nd_rd + 1, icmp6len, &ndopts); 2087 if (nd6_options(&ndopts) < 0) { 2088 log(LOG_INFO, "icmp6_redirect_input: " 2089 "invalid ND option, rejected: %s\n", 2090 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); 2091 goto freeit; 2092 } 2093 2094 if (ndopts.nd_opts_tgt_lladdr) { 2095 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 2096 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 2097 } 2098 2099 if (ndopts.nd_opts_rh) { 2100 redirhdrlen = ndopts.nd_opts_rh->nd_opt_rh_len; 2101 redirhdr = (u_char *)(ndopts.nd_opts_rh + 1); /* xxx */ 2102 } 2103 2104 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 2105 log(LOG_INFO, 2106 "icmp6_redirect_input: lladdrlen mismatch for %s " 2107 "(if %d, icmp6 packet %d): %s\n", 2108 ip6_sprintf(&redtgt6), ifp->if_addrlen, lladdrlen - 2, 2109 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); 2110 } 2111 2112 /* RFC 2461 8.3 */ 2113 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT, 2114 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER); 2115 2116 if (!is_onlink) { /* better router case. perform rtredirect. */ 2117 /* perform rtredirect */ 2118 struct sockaddr_in6 sdst; 2119 struct sockaddr_in6 sgw; 2120 struct sockaddr_in6 ssrc; 2121 2122 bzero(&sdst, sizeof(sdst)); 2123 bzero(&sgw, sizeof(sgw)); 2124 bzero(&ssrc, sizeof(ssrc)); 2125 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6; 2126 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len = 2127 sizeof(struct sockaddr_in6); 2128 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr)); 2129 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2130 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr)); 2131 rtredirect((struct sockaddr *)&sdst, (struct sockaddr *)&sgw, 2132 (struct sockaddr *)NULL, RTF_GATEWAY | RTF_HOST, 2133 (struct sockaddr *)&ssrc, 2134 (struct rtentry **)NULL 2135 ); 2136 } 2137 /* finally update cached route in each socket via pfctlinput */ 2138 { 2139 struct sockaddr_in6 sdst; 2140#if 1 2141#else 2142 struct ip6protosw *pr; 2143#endif 2144 2145 bzero(&sdst, sizeof(sdst)); 2146 sdst.sin6_family = AF_INET6; 2147 sdst.sin6_len = sizeof(struct sockaddr_in6); 2148 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2149#if 1 2150 pfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst); 2151#else 2152 /* 2153 * do not use pfctlinput() here, we have different prototype for 2154 * xx_ctlinput() in ip6proto. 2155 */ 2156 for (pr = (struct ip6protosw *)inet6domain.dom_protosw; 2157 pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; 2158 pr++) { 2159 if (pr->pr_ctlinput) { 2160 (*pr->pr_ctlinput)(PRC_REDIRECT_HOST, 2161 (struct sockaddr *)&sdst, NULL, NULL, 0); 2162 } 2163 } 2164#endif 2165#ifdef IPSEC 2166 key_sa_routechange((struct sockaddr *)&sdst); 2167#endif 2168 } 2169 2170 freeit: 2171 m_freem(m); 2172} 2173 2174void 2175icmp6_redirect_output(m0, rt) 2176 struct mbuf *m0; 2177 struct rtentry *rt; 2178{ 2179 struct ifnet *ifp; /* my outgoing interface */ 2180 struct in6_addr *ifp_ll6; 2181 struct in6_addr *router_ll6; 2182 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */ 2183 struct mbuf *m = NULL; /* newly allocated one */ 2184 struct ip6_hdr *ip6; /* m as struct ip6_hdr */ 2185 struct nd_redirect *nd_rd; 2186 size_t maxlen; 2187 u_char *p; 2188 struct ifnet *outif = NULL; 2189 struct sockaddr_in6 src_sa; 2190 2191 icmp6_errcount(&icmp6stat.icp6s_outerrhist, ND_REDIRECT, 0); 2192 2193 /* if we are not router, we don't send icmp6 redirect */ 2194 if (!ip6_forwarding || ip6_accept_rtadv) 2195 goto fail; 2196 2197 /* sanity check */ 2198 if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp)) 2199 goto fail; 2200 2201 /* 2202 * Address check: 2203 * the source address must identify a neighbor, and 2204 * the destination address must not be a multicast address 2205 * [RFC 2461, sec 8.2] 2206 */ 2207 sip6 = mtod(m0, struct ip6_hdr *); 2208 bzero(&src_sa, sizeof(src_sa)); 2209 src_sa.sin6_family = AF_INET6; 2210 src_sa.sin6_len = sizeof(src_sa); 2211 src_sa.sin6_addr = sip6->ip6_src; 2212 /* we don't currently use sin6_scope_id, but eventually use it */ 2213 src_sa.sin6_scope_id = in6_addr2scopeid(ifp, &sip6->ip6_src); 2214 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0) 2215 goto fail; 2216 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst)) 2217 goto fail; /* what should we do here? */ 2218 2219 /* rate limit */ 2220 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0)) 2221 goto fail; 2222 2223 /* 2224 * Since we are going to append up to 1280 bytes (= IPV6_MMTU), 2225 * we almost always ask for an mbuf cluster for simplicity. 2226 * (MHLEN < IPV6_MMTU is almost always true) 2227 */ 2228#if IPV6_MMTU >= MCLBYTES 2229# error assumption failed about IPV6_MMTU and MCLBYTES 2230#endif 2231 MGETHDR(m, M_DONTWAIT, MT_HEADER); 2232 if (m && IPV6_MMTU >= MHLEN) 2233 MCLGET(m, M_DONTWAIT); 2234 if (!m) 2235 goto fail; 2236 maxlen = (m->m_flags & M_EXT) ? MCLBYTES : MHLEN; 2237 maxlen = min(IPV6_MMTU, maxlen); 2238 /* just for safety */ 2239 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) + 2240 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) { 2241 goto fail; 2242 } 2243 2244 { 2245 /* get ip6 linklocal address for ifp(my outgoing interface). */ 2246 struct in6_ifaddr *ia; 2247 if ((ia = in6ifa_ifpforlinklocal(ifp, 2248 IN6_IFF_NOTREADY| 2249 IN6_IFF_ANYCAST)) == NULL) 2250 goto fail; 2251 ifp_ll6 = &ia->ia_addr.sin6_addr; 2252 } 2253 2254 /* get ip6 linklocal address for the router. */ 2255 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) { 2256 struct sockaddr_in6 *sin6; 2257 sin6 = (struct sockaddr_in6 *)rt->rt_gateway; 2258 router_ll6 = &sin6->sin6_addr; 2259 if (!IN6_IS_ADDR_LINKLOCAL(router_ll6)) 2260 router_ll6 = (struct in6_addr *)NULL; 2261 } else 2262 router_ll6 = (struct in6_addr *)NULL; 2263 2264 /* ip6 */ 2265 ip6 = mtod(m, struct ip6_hdr *); 2266 ip6->ip6_flow = 0; 2267 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2268 ip6->ip6_vfc |= IPV6_VERSION; 2269 /* ip6->ip6_plen will be set later */ 2270 ip6->ip6_nxt = IPPROTO_ICMPV6; 2271 ip6->ip6_hlim = 255; 2272 /* ip6->ip6_src must be linklocal addr for my outgoing if. */ 2273 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr)); 2274 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr)); 2275 2276 /* ND Redirect */ 2277 nd_rd = (struct nd_redirect *)(ip6 + 1); 2278 nd_rd->nd_rd_type = ND_REDIRECT; 2279 nd_rd->nd_rd_code = 0; 2280 nd_rd->nd_rd_reserved = 0; 2281 if (rt->rt_flags & RTF_GATEWAY) { 2282 /* 2283 * nd_rd->nd_rd_target must be a link-local address in 2284 * better router cases. 2285 */ 2286 if (!router_ll6) 2287 goto fail; 2288 bcopy(router_ll6, &nd_rd->nd_rd_target, 2289 sizeof(nd_rd->nd_rd_target)); 2290 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2291 sizeof(nd_rd->nd_rd_dst)); 2292 } else { 2293 /* make sure redtgt == reddst */ 2294 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target, 2295 sizeof(nd_rd->nd_rd_target)); 2296 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2297 sizeof(nd_rd->nd_rd_dst)); 2298 } 2299 2300 p = (u_char *)(nd_rd + 1); 2301 2302 if (!router_ll6) 2303 goto nolladdropt; 2304 2305 { 2306 /* target lladdr option */ 2307 struct rtentry *rt_router = NULL; 2308 int len; 2309 struct sockaddr_dl *sdl; 2310 struct nd_opt_hdr *nd_opt; 2311 char *lladdr; 2312 2313 rt_router = nd6_lookup(router_ll6, 0, ifp); 2314 if (!rt_router) 2315 goto nolladdropt; 2316 len = sizeof(*nd_opt) + ifp->if_addrlen; 2317 len = (len + 7) & ~7; /*round by 8*/ 2318 /* safety check */ 2319 if (len + (p - (u_char *)ip6) > maxlen) 2320 goto nolladdropt; 2321 if (!(rt_router->rt_flags & RTF_GATEWAY) && 2322 (rt_router->rt_flags & RTF_LLINFO) && 2323 (rt_router->rt_gateway->sa_family == AF_LINK) && 2324 (sdl = (struct sockaddr_dl *)rt_router->rt_gateway) && 2325 sdl->sdl_alen) { 2326 nd_opt = (struct nd_opt_hdr *)p; 2327 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 2328 nd_opt->nd_opt_len = len >> 3; 2329 lladdr = (char *)(nd_opt + 1); 2330 bcopy(LLADDR(sdl), lladdr, ifp->if_addrlen); 2331 p += len; 2332 } 2333 } 2334nolladdropt:; 2335 2336 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2337 2338 /* just to be safe */ 2339 if (m0->m_flags & M_DECRYPTED) 2340 goto noredhdropt; 2341 if (p - (u_char *)ip6 > maxlen) 2342 goto noredhdropt; 2343 2344 { 2345 /* redirected header option */ 2346 int len; 2347 struct nd_opt_rd_hdr *nd_opt_rh; 2348 2349 /* 2350 * compute the maximum size for icmp6 redirect header option. 2351 * XXX room for auth header? 2352 */ 2353 len = maxlen - (p - (u_char *)ip6); 2354 len &= ~7; 2355 2356 /* This is just for simplicity. */ 2357 if (m0->m_pkthdr.len != m0->m_len) { 2358 if (m0->m_next) { 2359 m_freem(m0->m_next); 2360 m0->m_next = NULL; 2361 } 2362 m0->m_pkthdr.len = m0->m_len; 2363 } 2364 2365 /* 2366 * Redirected header option spec (RFC2461 4.6.3) talks nothing 2367 * about padding/truncate rule for the original IP packet. 2368 * From the discussion on IPv6imp in Feb 1999, the consensus was: 2369 * - "attach as much as possible" is the goal 2370 * - pad if not aligned (original size can be guessed by original 2371 * ip6 header) 2372 * Following code adds the padding if it is simple enough, 2373 * and truncates if not. 2374 */ 2375 if (m0->m_next || m0->m_pkthdr.len != m0->m_len) 2376 panic("assumption failed in %s:%d\n", __FILE__, __LINE__); 2377 2378 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) { 2379 /* not enough room, truncate */ 2380 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh); 2381 } else { 2382 /* enough room, pad or truncate */ 2383 size_t extra; 2384 2385 extra = m0->m_pkthdr.len % 8; 2386 if (extra) { 2387 /* pad if easy enough, truncate if not */ 2388 if (8 - extra <= M_TRAILINGSPACE(m0)) { 2389 /* pad */ 2390 m0->m_len += (8 - extra); 2391 m0->m_pkthdr.len += (8 - extra); 2392 } else { 2393 /* truncate */ 2394 m0->m_pkthdr.len -= extra; 2395 m0->m_len -= extra; 2396 } 2397 } 2398 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh); 2399 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh); 2400 } 2401 2402 nd_opt_rh = (struct nd_opt_rd_hdr *)p; 2403 bzero(nd_opt_rh, sizeof(*nd_opt_rh)); 2404 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER; 2405 nd_opt_rh->nd_opt_rh_len = len >> 3; 2406 p += sizeof(*nd_opt_rh); 2407 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2408 2409 /* connect m0 to m */ 2410 m->m_next = m0; 2411 m->m_pkthdr.len = m->m_len + m0->m_len; 2412 } 2413noredhdropt:; 2414 2415 if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_src)) 2416 sip6->ip6_src.s6_addr16[1] = 0; 2417 if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_dst)) 2418 sip6->ip6_dst.s6_addr16[1] = 0; 2419#if 0 2420 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src)) 2421 ip6->ip6_src.s6_addr16[1] = 0; 2422 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) 2423 ip6->ip6_dst.s6_addr16[1] = 0; 2424#endif 2425 if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_target)) 2426 nd_rd->nd_rd_target.s6_addr16[1] = 0; 2427 if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_dst)) 2428 nd_rd->nd_rd_dst.s6_addr16[1] = 0; 2429 2430 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 2431 2432 nd_rd->nd_rd_cksum = 0; 2433 nd_rd->nd_rd_cksum 2434 = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen)); 2435 2436 /* send the packet to outside... */ 2437#ifdef IPSEC 2438 /* Don't lookup socket */ 2439 ipsec_setsocket(m, NULL); 2440#endif /*IPSEC*/ 2441 ip6_output(m, NULL, NULL, 0, NULL, &outif); 2442 if (outif) { 2443 icmp6_ifstat_inc(outif, ifs6_out_msg); 2444 icmp6_ifstat_inc(outif, ifs6_out_redirect); 2445 } 2446 icmp6stat.icp6s_outhist[ND_REDIRECT]++; 2447 2448 return; 2449 2450fail: 2451 if (m) 2452 m_freem(m); 2453 if (m0) 2454 m_freem(m0); 2455} 2456 2457/* 2458 * ICMPv6 socket option processing. 2459 */ 2460int 2461icmp6_ctloutput(op, so, level, optname, mp) 2462 int op; 2463 struct socket *so; 2464 int level, optname; 2465 struct mbuf **mp; 2466{ 2467 register struct in6pcb *in6p = sotoin6pcb(so); 2468 register struct mbuf *m = *mp; 2469 int error = 0; 2470 2471 if (level != IPPROTO_ICMPV6) { 2472 error = EINVAL; 2473 if (op == PRCO_SETOPT && m) 2474 (void)m_free(m); 2475 } else switch(op) { 2476 case PRCO_SETOPT: 2477 switch (optname) { 2478 case ICMP6_FILTER: 2479 { 2480 struct icmp6_filter *p; 2481 2482 p = mtod(m, struct icmp6_filter *); 2483 if (!p || !in6p->in6p_icmp6filt) { 2484 error = EINVAL; 2485 break; 2486 } 2487 bcopy(p, in6p->in6p_icmp6filt, 2488 sizeof(struct icmp6_filter)); 2489 error = 0; 2490 break; 2491 } 2492 2493 default: 2494 error = ENOPROTOOPT; 2495 break; 2496 } 2497 if (m) 2498 (void)m_free(m); 2499 break; 2500 2501 case PRCO_GETOPT: 2502 switch (optname) { 2503 case ICMP6_FILTER: 2504 { 2505 struct icmp6_filter *p; 2506 2507 if (!in6p->in6p_icmp6filt) { 2508 error = EINVAL; 2509 break; 2510 } 2511 *mp = m = m_get(M_WAIT, MT_SOOPTS); 2512 m->m_len = sizeof(struct icmp6_filter); 2513 p = mtod(m, struct icmp6_filter *); 2514 bcopy(in6p->in6p_icmp6filt, p, 2515 sizeof(struct icmp6_filter)); 2516 error = 0; 2517 break; 2518 } 2519 2520 default: 2521 error = ENOPROTOOPT; 2522 break; 2523 } 2524 break; 2525 } 2526 2527 return(error); 2528} 2529 2530/* 2531 * Perform rate limit check. 2532 * Returns 0 if it is okay to send the icmp6 packet. 2533 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate 2534 * limitation. 2535 * 2536 * There are two limitations defined: 2537 * - pps limit: ICMPv6 error packet cannot exceed defined packet-per-second. 2538 * we measure it every 0.2 second, since fasttimo works every 0.2 second. 2539 * - rate limit: ICMPv6 error packet cannot appear more than once per 2540 * defined interval. 2541 * In any case, if we perform rate limitation, we'll see jitter in the ICMPv6 2542 * error packets. 2543 * 2544 * XXX per-destination/type check necessary? 2545 */ 2546static int 2547icmp6_ratelimit(dst, type, code) 2548 const struct in6_addr *dst; /* not used at this moment */ 2549 const int type; /* not used at this moment */ 2550 const int code; /* not used at this moment */ 2551{ 2552 int ret; 2553 2554 ret = 0; /*okay to send*/ 2555 2556 /* PPS limit */ 2557 if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count, 2558 icmp6errppslim)) { 2559 /* The packet is subject to rate limit */ 2560 ret++; 2561 } 2562 2563 return ret; 2564} 2565 2566static struct rtentry * 2567icmp6_mtudisc_clone(dst) 2568 struct sockaddr *dst; 2569{ 2570 struct rtentry *rt; 2571 int error; 2572 2573 rt = rtalloc1(dst, 1); 2574 if (rt == 0) 2575 return NULL; 2576 2577 /* If we didn't get a host route, allocate one */ 2578 if ((rt->rt_flags & RTF_HOST) == 0) { 2579 struct rtentry *nrt; 2580 2581 error = rtrequest((int) RTM_ADD, dst, 2582 (struct sockaddr *) rt->rt_gateway, 2583 (struct sockaddr *) 0, 2584 RTF_GATEWAY | RTF_HOST | RTF_DYNAMIC, &nrt); 2585 if (error) { 2586 rtfree(rt); 2587 rtfree(nrt); 2588 return NULL; 2589 } 2590 nrt->rt_rmx = rt->rt_rmx; 2591 rtfree(rt); 2592 rt = nrt; 2593 } 2594 error = rt_timer_add(rt, icmp6_mtudisc_timeout, 2595 icmp6_mtudisc_timeout_q); 2596 if (error) { 2597 rtfree(rt); 2598 return NULL; 2599 } 2600 2601 return rt; /* caller need to call rtfree() */ 2602} 2603 2604static void 2605icmp6_mtudisc_timeout(rt, r) 2606 struct rtentry *rt; 2607 struct rttimer *r; 2608{ 2609 if (rt == NULL) 2610 panic("icmp6_mtudisc_timeout: bad route to timeout"); 2611 if ((rt->rt_flags & (RTF_DYNAMIC | RTF_HOST)) == 2612 (RTF_DYNAMIC | RTF_HOST)) { 2613 rtrequest((int) RTM_DELETE, (struct sockaddr *)rt_key(rt), 2614 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0); 2615 } else { 2616 if ((rt->rt_rmx.rmx_locks & RTV_MTU) == 0) { 2617 rt->rt_rmx.rmx_mtu = 0; 2618 } 2619 } 2620} 2621 2622#include <uvm/uvm_extern.h> 2623#include <sys/sysctl.h> 2624 2625int 2626icmp6_sysctl(name, namelen, oldp, oldlenp, newp, newlen) 2627 int *name; 2628 u_int namelen; 2629 void *oldp; 2630 size_t *oldlenp; 2631 void *newp; 2632 size_t newlen; 2633{ 2634 2635 /* All sysctl names at this level are terminal. */ 2636 if (namelen != 1) 2637 return ENOTDIR; 2638 2639 switch (name[0]) { 2640 2641 case ICMPV6CTL_REDIRACCEPT: 2642 return sysctl_int(oldp, oldlenp, newp, newlen, 2643 &icmp6_rediraccept); 2644 case ICMPV6CTL_REDIRTIMEOUT: 2645 return sysctl_int(oldp, oldlenp, newp, newlen, 2646 &icmp6_redirtimeout); 2647 case ICMPV6CTL_STATS: 2648 return sysctl_rdstruct(oldp, oldlenp, newp, 2649 &icmp6stat, sizeof(icmp6stat)); 2650 case ICMPV6CTL_ND6_PRUNE: 2651 return sysctl_int(oldp, oldlenp, newp, newlen, &nd6_prune); 2652 case ICMPV6CTL_ND6_DELAY: 2653 return sysctl_int(oldp, oldlenp, newp, newlen, &nd6_delay); 2654 case ICMPV6CTL_ND6_UMAXTRIES: 2655 return sysctl_int(oldp, oldlenp, newp, newlen, &nd6_umaxtries); 2656 case ICMPV6CTL_ND6_MMAXTRIES: 2657 return sysctl_int(oldp, oldlenp, newp, newlen, &nd6_mmaxtries); 2658 case ICMPV6CTL_ND6_USELOOPBACK: 2659 return sysctl_int(oldp, oldlenp, newp, newlen, 2660 &nd6_useloopback); 2661 case ICMPV6CTL_NODEINFO: 2662 return sysctl_int(oldp, oldlenp, newp, newlen, &icmp6_nodeinfo); 2663 case ICMPV6CTL_ERRPPSLIMIT: 2664 return sysctl_int(oldp, oldlenp, newp, newlen, &icmp6errppslim); 2665 case ICMPV6CTL_ND6_MAXNUDHINT: 2666 return sysctl_int(oldp, oldlenp, newp, newlen, 2667 &nd6_maxnudhint); 2668 default: 2669 return ENOPROTOOPT; 2670 } 2671 /* NOTREACHED */ 2672} 2673