icmp6.c revision 1.58
1/* $NetBSD: icmp6.c,v 1.58 2001/02/11 06:49:51 itojun Exp $ */ 2/* $KAME: icmp6.c,v 1.198 2001/02/11 04:51:12 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; 118 119/* 120 * List of callbacks to notify when Path MTU changes are made. 121 */ 122struct icmp6_mtudisc_callback { 123 LIST_ENTRY(icmp6_mtudisc_callback) mc_list; 124 void (*mc_func) __P((struct in6_addr *)); 125}; 126 127LIST_HEAD(, icmp6_mtudisc_callback) icmp6_mtudisc_callbacks = 128 LIST_HEAD_INITIALIZER(&icmp6_mtudisc_callbacks); 129 130static struct rttimer_queue *icmp6_mtudisc_timeout_q = NULL; 131extern int pmtu_expire; 132 133/* XXX do these values make any sense? */ 134static int icmp6_mtudisc_hiwat = 1280; 135static int icmp6_mtudisc_lowat = 256; 136 137/* 138 * keep track of # of redirect routes. 139 */ 140static struct rttimer_queue *icmp6_redirect_timeout_q = NULL; 141 142/* XXX experimental, turned off */ 143static int icmp6_redirect_hiwat = -1; 144static int icmp6_redirect_lowat = -1; 145 146static void icmp6_errcount __P((struct icmp6errstat *, int, int)); 147static int icmp6_rip6_input __P((struct mbuf **, int)); 148static int icmp6_ratelimit __P((const struct in6_addr *, const int, const int)); 149static const char *icmp6_redirect_diag __P((struct in6_addr *, 150 struct in6_addr *, struct in6_addr *)); 151static struct mbuf *ni6_input __P((struct mbuf *, int)); 152static struct mbuf *ni6_nametodns __P((const char *, int, int)); 153static int ni6_dnsmatch __P((const char *, int, const char *, int)); 154static int ni6_addrs __P((struct icmp6_nodeinfo *, struct mbuf *, 155 struct ifnet **, char *)); 156static int ni6_store_addrs __P((struct icmp6_nodeinfo *, struct icmp6_nodeinfo *, 157 struct ifnet *, int)); 158static int icmp6_notify_error __P((struct mbuf *, int, int, int)); 159static struct rtentry *icmp6_mtudisc_clone __P((struct sockaddr *)); 160static void icmp6_mtudisc_timeout __P((struct rtentry *, struct rttimer *)); 161static void icmp6_redirect_timeout __P((struct rtentry *, struct rttimer *)); 162 163#ifdef COMPAT_RFC1885 164static struct route_in6 icmp6_reflect_rt; 165#endif 166 167void 168icmp6_init() 169{ 170 mld6_init(); 171 icmp6_mtudisc_timeout_q = rt_timer_queue_create(pmtu_expire); 172 icmp6_redirect_timeout_q = rt_timer_queue_create(icmp6_redirtimeout); 173} 174 175static void 176icmp6_errcount(stat, type, code) 177 struct icmp6errstat *stat; 178 int type, code; 179{ 180 switch (type) { 181 case ICMP6_DST_UNREACH: 182 switch (code) { 183 case ICMP6_DST_UNREACH_NOROUTE: 184 stat->icp6errs_dst_unreach_noroute++; 185 return; 186 case ICMP6_DST_UNREACH_ADMIN: 187 stat->icp6errs_dst_unreach_admin++; 188 return; 189 case ICMP6_DST_UNREACH_BEYONDSCOPE: 190 stat->icp6errs_dst_unreach_beyondscope++; 191 return; 192 case ICMP6_DST_UNREACH_ADDR: 193 stat->icp6errs_dst_unreach_addr++; 194 return; 195 case ICMP6_DST_UNREACH_NOPORT: 196 stat->icp6errs_dst_unreach_noport++; 197 return; 198 } 199 break; 200 case ICMP6_PACKET_TOO_BIG: 201 stat->icp6errs_packet_too_big++; 202 return; 203 case ICMP6_TIME_EXCEEDED: 204 switch (code) { 205 case ICMP6_TIME_EXCEED_TRANSIT: 206 stat->icp6errs_time_exceed_transit++; 207 return; 208 case ICMP6_TIME_EXCEED_REASSEMBLY: 209 stat->icp6errs_time_exceed_reassembly++; 210 return; 211 } 212 break; 213 case ICMP6_PARAM_PROB: 214 switch (code) { 215 case ICMP6_PARAMPROB_HEADER: 216 stat->icp6errs_paramprob_header++; 217 return; 218 case ICMP6_PARAMPROB_NEXTHEADER: 219 stat->icp6errs_paramprob_nextheader++; 220 return; 221 case ICMP6_PARAMPROB_OPTION: 222 stat->icp6errs_paramprob_option++; 223 return; 224 } 225 break; 226 case ND_REDIRECT: 227 stat->icp6errs_redirect++; 228 return; 229 } 230 stat->icp6errs_unknown++; 231} 232 233/* 234 * Register a Path MTU Discovery callback. 235 */ 236void 237icmp6_mtudisc_callback_register(func) 238 void (*func) __P((struct in6_addr *)); 239{ 240 struct icmp6_mtudisc_callback *mc; 241 242 for (mc = LIST_FIRST(&icmp6_mtudisc_callbacks); mc != NULL; 243 mc = LIST_NEXT(mc, mc_list)) { 244 if (mc->mc_func == func) 245 return; 246 } 247 248 mc = malloc(sizeof(*mc), M_PCB, M_NOWAIT); 249 if (mc == NULL) 250 panic("icmp6_mtudisc_callback_register"); 251 252 mc->mc_func = func; 253 LIST_INSERT_HEAD(&icmp6_mtudisc_callbacks, mc, mc_list); 254} 255 256/* 257 * Generate an error packet of type error in response to bad IP6 packet. 258 */ 259void 260icmp6_error(m, type, code, param) 261 struct mbuf *m; 262 int type, code, param; 263{ 264 struct ip6_hdr *oip6, *nip6; 265 struct icmp6_hdr *icmp6; 266 u_int preplen; 267 int off; 268 int nxt; 269 270 icmp6stat.icp6s_error++; 271 272 /* count per-type-code statistics */ 273 icmp6_errcount(&icmp6stat.icp6s_outerrhist, type, code); 274 275 if (m->m_flags & M_DECRYPTED) { 276 icmp6stat.icp6s_canterror++; 277 goto freeit; 278 } 279 280#ifndef PULLDOWN_TEST 281 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), ); 282#else 283 if (m->m_len < sizeof(struct ip6_hdr)) { 284 m = m_pullup(m, sizeof(struct ip6_hdr)); 285 if (m == NULL) 286 return; 287 } 288#endif 289 oip6 = mtod(m, struct ip6_hdr *); 290 291 /* 292 * Multicast destination check. For unrecognized option errors, 293 * this check has already done in ip6_unknown_opt(), so we can 294 * check only for other errors. 295 */ 296 if ((m->m_flags & (M_BCAST|M_MCAST) || 297 IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) && 298 (type != ICMP6_PACKET_TOO_BIG && 299 (type != ICMP6_PARAM_PROB || 300 code != ICMP6_PARAMPROB_OPTION))) 301 goto freeit; 302 303 /* Source address check. XXX: the case of anycast source? */ 304 if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) || 305 IN6_IS_ADDR_MULTICAST(&oip6->ip6_src)) 306 goto freeit; 307 308 /* 309 * If we are about to send ICMPv6 against ICMPv6 error/redirect, 310 * don't do it. 311 */ 312 nxt = -1; 313 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 314 if (off >= 0 && nxt == IPPROTO_ICMPV6) { 315 struct icmp6_hdr *icp; 316 317#ifndef PULLDOWN_TEST 318 IP6_EXTHDR_CHECK(m, 0, off + sizeof(struct icmp6_hdr), ); 319 icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 320#else 321 IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off, 322 sizeof(*icp)); 323 if (icp == NULL) { 324 icmp6stat.icp6s_tooshort++; 325 return; 326 } 327#endif 328 if (icp->icmp6_type < ICMP6_ECHO_REQUEST || 329 icp->icmp6_type == ND_REDIRECT) { 330 /* 331 * ICMPv6 error 332 * Special case: for redirect (which is 333 * informational) we must not send icmp6 error. 334 */ 335 icmp6stat.icp6s_canterror++; 336 goto freeit; 337 } else { 338 /* ICMPv6 informational - send the error */ 339 } 340 } else { 341 /* non-ICMPv6 - send the error */ 342 } 343 344 oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */ 345 346 /* Finally, do rate limitation check. */ 347 if (icmp6_ratelimit(&oip6->ip6_src, type, code)) { 348 icmp6stat.icp6s_toofreq++; 349 goto freeit; 350 } 351 352 /* 353 * OK, ICMP6 can be generated. 354 */ 355 356 if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN) 357 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len); 358 359 preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 360 M_PREPEND(m, preplen, M_DONTWAIT); 361 if (m && m->m_len < preplen) 362 m = m_pullup(m, preplen); 363 if (m == NULL) { 364 nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__)); 365 return; 366 } 367 368 nip6 = mtod(m, struct ip6_hdr *); 369 nip6->ip6_src = oip6->ip6_src; 370 nip6->ip6_dst = oip6->ip6_dst; 371 372 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_src)) 373 oip6->ip6_src.s6_addr16[1] = 0; 374 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_dst)) 375 oip6->ip6_dst.s6_addr16[1] = 0; 376 377 icmp6 = (struct icmp6_hdr *)(nip6 + 1); 378 icmp6->icmp6_type = type; 379 icmp6->icmp6_code = code; 380 icmp6->icmp6_pptr = htonl((u_int32_t)param); 381 382 icmp6stat.icp6s_outhist[type]++; 383 icmp6_reflect(m, sizeof(struct ip6_hdr)); /*header order: IPv6 - ICMPv6*/ 384 385 return; 386 387 freeit: 388 /* 389 * If we can't tell wheter or not we can generate ICMP6, free it. 390 */ 391 m_freem(m); 392} 393 394/* 395 * Process a received ICMP6 message. 396 */ 397int 398icmp6_input(mp, offp, proto) 399 struct mbuf **mp; 400 int *offp, proto; 401{ 402 struct mbuf *m = *mp, *n; 403 struct ip6_hdr *ip6, *nip6; 404 struct icmp6_hdr *icmp6, *nicmp6; 405 int off = *offp; 406 int icmp6len = m->m_pkthdr.len - *offp; 407 int code, sum, noff; 408 409#ifndef PULLDOWN_TEST 410 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr), IPPROTO_DONE); 411 /* m might change if M_LOOP. So, call mtod after this */ 412#endif 413 414 /* 415 * Locate icmp6 structure in mbuf, and check 416 * that not corrupted and of at least minimum length 417 */ 418 419 ip6 = mtod(m, struct ip6_hdr *); 420 if (icmp6len < sizeof(struct icmp6_hdr)) { 421 icmp6stat.icp6s_tooshort++; 422 goto freeit; 423 } 424 425 /* 426 * calculate the checksum 427 */ 428#ifndef PULLDOWN_TEST 429 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off); 430#else 431 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 432 if (icmp6 == NULL) { 433 icmp6stat.icp6s_tooshort++; 434 return IPPROTO_DONE; 435 } 436#endif 437 code = icmp6->icmp6_code; 438 439 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) { 440 nd6log((LOG_ERR, 441 "ICMP6 checksum error(%d|%x) %s\n", 442 icmp6->icmp6_type, sum, ip6_sprintf(&ip6->ip6_src))); 443 icmp6stat.icp6s_checksum++; 444 goto freeit; 445 } 446 447#if defined(NFAITH) && 0 < NFAITH 448 if (m->m_pkthdr.rcvif && m->m_pkthdr.rcvif->if_type == IFT_FAITH) { 449 /* 450 * Deliver very specific ICMP6 type only. 451 * This is important to deilver TOOBIG. Otherwise PMTUD 452 * will not work. 453 */ 454 switch (icmp6->icmp6_type) { 455 case ICMP6_DST_UNREACH: 456 case ICMP6_PACKET_TOO_BIG: 457 case ICMP6_TIME_EXCEEDED: 458 break; 459 default: 460 goto freeit; 461 } 462 } 463#endif 464 465#ifdef IPSEC 466 /* drop it if it does not match the default policy */ 467 if (ipsec6_in_reject(m, NULL)) { 468 ipsec6stat.in_polvio++; 469 goto freeit; 470 } 471#endif 472 473 icmp6stat.icp6s_inhist[icmp6->icmp6_type]++; 474 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_msg); 475 if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK) 476 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error); 477 478 switch (icmp6->icmp6_type) { 479 480 case ICMP6_DST_UNREACH: 481 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_dstunreach); 482 switch (code) { 483 case ICMP6_DST_UNREACH_NOROUTE: 484 code = PRC_UNREACH_NET; 485 break; 486 case ICMP6_DST_UNREACH_ADMIN: 487 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_adminprohib); 488 code = PRC_UNREACH_PROTOCOL; /* is this a good code? */ 489 break; 490 case ICMP6_DST_UNREACH_ADDR: 491 code = PRC_HOSTDEAD; 492 break; 493#ifdef COMPAT_RFC1885 494 case ICMP6_DST_UNREACH_NOTNEIGHBOR: 495 code = PRC_UNREACH_SRCFAIL; 496 break; 497#else 498 case ICMP6_DST_UNREACH_BEYONDSCOPE: 499 /* I mean "source address was incorrect." */ 500 code = PRC_PARAMPROB; 501 break; 502#endif 503 case ICMP6_DST_UNREACH_NOPORT: 504 code = PRC_UNREACH_PORT; 505 break; 506 default: 507 goto badcode; 508 } 509 goto deliver; 510 break; 511 512 case ICMP6_PACKET_TOO_BIG: 513 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_pkttoobig); 514 if (code != 0) 515 goto badcode; 516 517 code = PRC_MSGSIZE; 518 519 /* 520 * Updating the path MTU will be done after examining 521 * intermediate extension headers. 522 */ 523 goto deliver; 524 break; 525 526 case ICMP6_TIME_EXCEEDED: 527 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_timeexceed); 528 switch (code) { 529 case ICMP6_TIME_EXCEED_TRANSIT: 530 case ICMP6_TIME_EXCEED_REASSEMBLY: 531 code += PRC_TIMXCEED_INTRANS; 532 break; 533 default: 534 goto badcode; 535 } 536 goto deliver; 537 break; 538 539 case ICMP6_PARAM_PROB: 540 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_paramprob); 541 switch (code) { 542 case ICMP6_PARAMPROB_NEXTHEADER: 543 code = PRC_UNREACH_PROTOCOL; 544 break; 545 case ICMP6_PARAMPROB_HEADER: 546 case ICMP6_PARAMPROB_OPTION: 547 code = PRC_PARAMPROB; 548 break; 549 default: 550 goto badcode; 551 } 552 goto deliver; 553 break; 554 555 case ICMP6_ECHO_REQUEST: 556 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echo); 557 if (code != 0) 558 goto badcode; 559 if ((n = m_copy(m, 0, M_COPYALL)) == NULL) { 560 /* Give up remote */ 561 break; 562 } 563 if ((n->m_flags & M_EXT) != 0 564 || n->m_len < off + sizeof(struct icmp6_hdr)) { 565 struct mbuf *n0 = n; 566 const int maxlen = sizeof(*nip6) + sizeof(*nicmp6); 567 568 /* 569 * Prepare an internal mbuf. m_pullup() doesn't 570 * always copy the length we specified. 571 */ 572 if (maxlen >= MCLBYTES) { 573 /* Give up remote */ 574 m_freem(n0); 575 break; 576 } 577 MGETHDR(n, M_DONTWAIT, n0->m_type); 578 if (n && maxlen >= MHLEN) { 579 MCLGET(n, M_DONTWAIT); 580 if ((n->m_flags & M_EXT) == 0) { 581 m_free(n); 582 n = NULL; 583 } 584 } 585 if (n == NULL) { 586 /* Give up remote */ 587 m_freem(n0); 588 break; 589 } 590 M_COPY_PKTHDR(n, n0); 591 /* 592 * Copy IPv6 and ICMPv6 only. 593 */ 594 nip6 = mtod(n, struct ip6_hdr *); 595 bcopy(ip6, nip6, sizeof(struct ip6_hdr)); 596 nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 597 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); 598 noff = sizeof(struct ip6_hdr); 599 n->m_pkthdr.len = n->m_len = 600 noff + sizeof(struct icmp6_hdr); 601 /* 602 * Adjust mbuf. ip6_plen will be adjusted in 603 * ip6_output(). 604 */ 605 m_adj(n0, off + sizeof(struct icmp6_hdr)); 606 n->m_pkthdr.len += n0->m_pkthdr.len; 607 n->m_next = n0; 608 n0->m_flags &= ~M_PKTHDR; 609 } else { 610 nip6 = mtod(n, struct ip6_hdr *); 611 nicmp6 = (struct icmp6_hdr *)((caddr_t)nip6 + off); 612 noff = off; 613 } 614 nicmp6->icmp6_type = ICMP6_ECHO_REPLY; 615 nicmp6->icmp6_code = 0; 616 if (n) { 617 icmp6stat.icp6s_reflect++; 618 icmp6stat.icp6s_outhist[ICMP6_ECHO_REPLY]++; 619 icmp6_reflect(n, noff); 620 } 621 break; 622 623 case ICMP6_ECHO_REPLY: 624 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echoreply); 625 if (code != 0) 626 goto badcode; 627 break; 628 629 case MLD6_LISTENER_QUERY: 630 case MLD6_LISTENER_REPORT: 631 if (icmp6len < sizeof(struct mld6_hdr)) 632 goto badlen; 633 if (icmp6->icmp6_type == MLD6_LISTENER_QUERY) /* XXX: ugly... */ 634 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldquery); 635 else 636 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldreport); 637 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 638 /* give up local */ 639 mld6_input(m, off); 640 m = NULL; 641 goto freeit; 642 } 643 mld6_input(n, off); 644 /* m stays. */ 645 break; 646 647 case MLD6_LISTENER_DONE: 648 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mlddone); 649 if (icmp6len < sizeof(struct mld6_hdr)) /* necessary? */ 650 goto badlen; 651 break; /* nothing to be done in kernel */ 652 653 case MLD6_MTRACE_RESP: 654 case MLD6_MTRACE: 655 /* XXX: these two are experimental. not officially defind. */ 656 /* XXX: per-interface statistics? */ 657 break; /* just pass it to applications */ 658 659 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */ 660 { 661 enum { WRU, FQDN } mode; 662 663 if (!icmp6_nodeinfo) 664 break; 665 666 if (icmp6len == sizeof(struct icmp6_hdr) + 4) 667 mode = WRU; 668 else if (icmp6len >= sizeof(struct icmp6_nodeinfo)) 669 mode = FQDN; 670 else 671 goto badlen; 672 673 if (mode == FQDN) { 674#ifndef PULLDOWN_TEST 675 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo), 676 IPPROTO_DONE); 677#endif 678 n = m_copy(m, 0, M_COPYALL); 679 if (n) 680 n = ni6_input(n, off); 681 /* XXX meaningless if n == NULL */ 682 noff = sizeof(struct ip6_hdr); 683 } else { 684 u_char *p; 685 int maxlen, maxhlen; 686 687 if (code != 0) 688 goto badcode; 689 maxlen = sizeof(*nip6) + sizeof(*nicmp6) + 4; 690 if (maxlen >= MCLBYTES) { 691 /* Give up remote */ 692 break; 693 } 694 MGETHDR(n, M_DONTWAIT, m->m_type); 695 if (n && maxlen > MHLEN) { 696 MCLGET(n, M_DONTWAIT); 697 if ((n->m_flags & M_EXT) == 0) { 698 m_free(n); 699 n = NULL; 700 } 701 } 702 if (n == NULL) { 703 /* Give up remote */ 704 break; 705 } 706 n->m_len = 0; 707 maxhlen = M_TRAILINGSPACE(n) - maxlen; 708 if (maxhlen > hostnamelen) 709 maxhlen = hostnamelen; 710 /* 711 * Copy IPv6 and ICMPv6 only. 712 */ 713 nip6 = mtod(n, struct ip6_hdr *); 714 bcopy(ip6, nip6, sizeof(struct ip6_hdr)); 715 nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 716 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); 717 p = (u_char *)(nicmp6 + 1); 718 bzero(p, 4); 719 bcopy(hostname, p + 4, maxhlen); /*meaningless TTL*/ 720 noff = sizeof(struct ip6_hdr); 721 M_COPY_PKTHDR(n, m); /* just for recvif */ 722 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 723 sizeof(struct icmp6_hdr) + 4 + maxhlen; 724 nicmp6->icmp6_type = ICMP6_WRUREPLY; 725 nicmp6->icmp6_code = 0; 726 } 727#undef hostnamelen 728 if (n) { 729 icmp6stat.icp6s_reflect++; 730 icmp6stat.icp6s_outhist[ICMP6_WRUREPLY]++; 731 icmp6_reflect(n, noff); 732 } 733 break; 734 } 735 736 case ICMP6_WRUREPLY: 737 if (code != 0) 738 goto badcode; 739 break; 740 741 case ND_ROUTER_SOLICIT: 742 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routersolicit); 743 if (code != 0) 744 goto badcode; 745 if (icmp6len < sizeof(struct nd_router_solicit)) 746 goto badlen; 747 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 748 /* give up local */ 749 nd6_rs_input(m, off, icmp6len); 750 m = NULL; 751 goto freeit; 752 } 753 nd6_rs_input(n, off, icmp6len); 754 /* m stays. */ 755 break; 756 757 case ND_ROUTER_ADVERT: 758 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routeradvert); 759 if (code != 0) 760 goto badcode; 761 if (icmp6len < sizeof(struct nd_router_advert)) 762 goto badlen; 763 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 764 /* give up local */ 765 nd6_ra_input(m, off, icmp6len); 766 m = NULL; 767 goto freeit; 768 } 769 nd6_ra_input(n, off, icmp6len); 770 /* m stays. */ 771 break; 772 773 case ND_NEIGHBOR_SOLICIT: 774 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighborsolicit); 775 if (code != 0) 776 goto badcode; 777 if (icmp6len < sizeof(struct nd_neighbor_solicit)) 778 goto badlen; 779 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 780 /* give up local */ 781 nd6_ns_input(m, off, icmp6len); 782 m = NULL; 783 goto freeit; 784 } 785 nd6_ns_input(n, off, icmp6len); 786 /* m stays. */ 787 break; 788 789 case ND_NEIGHBOR_ADVERT: 790 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighboradvert); 791 if (code != 0) 792 goto badcode; 793 if (icmp6len < sizeof(struct nd_neighbor_advert)) 794 goto badlen; 795 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 796 /* give up local */ 797 nd6_na_input(m, off, icmp6len); 798 m = NULL; 799 goto freeit; 800 } 801 nd6_na_input(n, off, icmp6len); 802 /* m stays. */ 803 break; 804 805 case ND_REDIRECT: 806 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_redirect); 807 if (code != 0) 808 goto badcode; 809 if (icmp6len < sizeof(struct nd_redirect)) 810 goto badlen; 811 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 812 /* give up local */ 813 icmp6_redirect_input(m, off); 814 m = NULL; 815 goto freeit; 816 } 817 icmp6_redirect_input(n, off); 818 /* m stays. */ 819 break; 820 821 case ICMP6_ROUTER_RENUMBERING: 822 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND && 823 code != ICMP6_ROUTER_RENUMBERING_RESULT) 824 goto badcode; 825 if (icmp6len < sizeof(struct icmp6_router_renum)) 826 goto badlen; 827 break; 828 829 default: 830 nd6log((LOG_DEBUG, 831 "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n", 832 icmp6->icmp6_type, ip6_sprintf(&ip6->ip6_src), 833 ip6_sprintf(&ip6->ip6_dst), 834 m->m_pkthdr.rcvif ? m->m_pkthdr.rcvif->if_index : 0)); 835 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) { 836 /* ICMPv6 error: MUST deliver it by spec... */ 837 code = PRC_NCMDS; 838 /* deliver */ 839 } else { 840 /* ICMPv6 informational: MUST not deliver */ 841 break; 842 } 843 deliver: 844 if (icmp6_notify_error(m, off, icmp6len, code)) { 845 /* In this case, m should've been freed. */ 846 return(IPPROTO_DONE); 847 } 848 break; 849 850 badcode: 851 icmp6stat.icp6s_badcode++; 852 break; 853 854 badlen: 855 icmp6stat.icp6s_badlen++; 856 break; 857 } 858 859 /* deliver the packet to appropriate sockets */ 860 icmp6_rip6_input(&m, *offp); 861 862 return IPPROTO_DONE; 863 864 freeit: 865 m_freem(m); 866 return IPPROTO_DONE; 867} 868 869static int 870icmp6_notify_error(m, off, icmp6len, code) 871 struct mbuf *m; 872 int off, icmp6len; 873{ 874 struct icmp6_hdr *icmp6; 875 struct ip6_hdr *eip6; 876 u_int32_t notifymtu; 877 struct sockaddr_in6 icmp6src, icmp6dst; 878 879 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) { 880 icmp6stat.icp6s_tooshort++; 881 goto freeit; 882 } 883#ifndef PULLDOWN_TEST 884 IP6_EXTHDR_CHECK(m, off, 885 sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr), 886 -1); 887 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 888#else 889 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 890 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 891 if (icmp6 == NULL) { 892 icmp6stat.icp6s_tooshort++; 893 return(-1); 894 } 895#endif 896 eip6 = (struct ip6_hdr *)(icmp6 + 1); 897 898 /* Detect the upper level protocol */ 899 { 900 void (*ctlfunc) __P((int, struct sockaddr *, void *)); 901 u_int8_t nxt = eip6->ip6_nxt; 902 int eoff = off + sizeof(struct icmp6_hdr) + 903 sizeof(struct ip6_hdr); 904 struct ip6ctlparam ip6cp; 905 struct in6_addr *finaldst = NULL; 906 int icmp6type = icmp6->icmp6_type; 907 struct ip6_frag *fh; 908 struct ip6_rthdr *rth; 909 struct ip6_rthdr0 *rth0; 910 int rthlen; 911 912 while (1) { /* XXX: should avoid inf. loop explicitly? */ 913 struct ip6_ext *eh; 914 915 switch (nxt) { 916 case IPPROTO_HOPOPTS: 917 case IPPROTO_DSTOPTS: 918 case IPPROTO_AH: 919#ifndef PULLDOWN_TEST 920 IP6_EXTHDR_CHECK(m, 0, eoff + 921 sizeof(struct ip6_ext), 922 -1); 923 eh = (struct ip6_ext *)(mtod(m, caddr_t) 924 + eoff); 925#else 926 IP6_EXTHDR_GET(eh, struct ip6_ext *, m, 927 eoff, sizeof(*eh)); 928 if (eh == NULL) { 929 icmp6stat.icp6s_tooshort++; 930 return(-1); 931 } 932#endif 933 934 if (nxt == IPPROTO_AH) 935 eoff += (eh->ip6e_len + 2) << 2; 936 else 937 eoff += (eh->ip6e_len + 1) << 3; 938 nxt = eh->ip6e_nxt; 939 break; 940 case IPPROTO_ROUTING: 941 /* 942 * When the erroneous packet contains a 943 * routing header, we should examine the 944 * header to determine the final destination. 945 * Otherwise, we can't properly update 946 * information that depends on the final 947 * destination (e.g. path MTU). 948 */ 949#ifndef PULLDOWN_TEST 950 IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(*rth), 951 -1); 952 rth = (struct ip6_rthdr *)(mtod(m, caddr_t) 953 + eoff); 954#else 955 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m, 956 eoff, sizeof(*rth)); 957 if (rth == NULL) { 958 icmp6stat.icp6s_tooshort++; 959 return(-1); 960 } 961#endif 962 rthlen = (rth->ip6r_len + 1) << 3; 963 /* 964 * XXX: currently there is no 965 * officially defined type other 966 * than type-0. 967 * Note that if the segment left field 968 * is 0, all intermediate hops must 969 * have been passed. 970 */ 971 if (rth->ip6r_segleft && 972 rth->ip6r_type == IPV6_RTHDR_TYPE_0) { 973 int hops; 974 975#ifndef PULLDOWN_TEST 976 IP6_EXTHDR_CHECK(m, 0, eoff + rthlen, 977 -1); 978 rth0 = (struct ip6_rthdr0 *)(mtod(m, caddr_t) + eoff); 979#else 980 IP6_EXTHDR_GET(rth0, 981 struct ip6_rthdr0 *, m, 982 eoff, rthlen); 983 if (rth0 == NULL) { 984 icmp6stat.icp6s_tooshort++; 985 return(-1); 986 } 987#endif 988 /* just ignore a bogus header */ 989 if ((rth0->ip6r0_len % 2) == 0 && 990 (hops = rth0->ip6r0_len/2)) 991 finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1); 992 } 993 eoff += rthlen; 994 nxt = rth->ip6r_nxt; 995 break; 996 case IPPROTO_FRAGMENT: 997#ifndef PULLDOWN_TEST 998 IP6_EXTHDR_CHECK(m, 0, eoff + 999 sizeof(struct ip6_frag), 1000 -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 eip6 = (struct ip6_hdr *)(icmp6 + 1); 1048 bzero(&icmp6dst, sizeof(icmp6dst)); 1049 icmp6dst.sin6_len = sizeof(struct sockaddr_in6); 1050 icmp6dst.sin6_family = AF_INET6; 1051 if (finaldst == NULL) 1052 icmp6dst.sin6_addr = eip6->ip6_dst; 1053 else 1054 icmp6dst.sin6_addr = *finaldst; 1055 icmp6dst.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif, 1056 &icmp6dst.sin6_addr); 1057#ifndef SCOPEDROUTING 1058 if (in6_embedscope(&icmp6dst.sin6_addr, &icmp6dst, 1059 NULL, NULL)) { 1060 /* should be impossbile */ 1061 nd6log((LOG_DEBUG, 1062 "icmp6_notify_error: in6_embedscope failed\n")); 1063 goto freeit; 1064 } 1065#endif 1066 1067 /* 1068 * retrieve parameters from the inner IPv6 header, and convert 1069 * them into sockaddr structures. 1070 */ 1071 bzero(&icmp6src, sizeof(icmp6src)); 1072 icmp6src.sin6_len = sizeof(struct sockaddr_in6); 1073 icmp6src.sin6_family = AF_INET6; 1074 icmp6src.sin6_addr = eip6->ip6_src; 1075 icmp6src.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif, 1076 &icmp6src.sin6_addr); 1077#ifndef SCOPEDROUTING 1078 if (in6_embedscope(&icmp6src.sin6_addr, &icmp6src, 1079 NULL, NULL)) { 1080 /* should be impossbile */ 1081 nd6log((LOG_DEBUG, 1082 "icmp6_notify_error: in6_embedscope failed\n")); 1083 goto freeit; 1084 } 1085#endif 1086 icmp6src.sin6_flowinfo = 1087 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK); 1088 1089 if (finaldst == NULL) 1090 finaldst = &eip6->ip6_dst; 1091 ip6cp.ip6c_m = m; 1092 ip6cp.ip6c_icmp6 = icmp6; 1093 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1); 1094 ip6cp.ip6c_off = eoff; 1095 ip6cp.ip6c_finaldst = finaldst; 1096 ip6cp.ip6c_src = &icmp6src; 1097 ip6cp.ip6c_nxt = nxt; 1098 1099 if (icmp6type == ICMP6_PACKET_TOO_BIG) { 1100 notifymtu = ntohl(icmp6->icmp6_mtu); 1101 ip6cp.ip6c_cmdarg = (void *)¬ifymtu; 1102 } 1103 1104 ctlfunc = (void (*) __P((int, struct sockaddr *, void *))) 1105 (inet6sw[ip6_protox[nxt]].pr_ctlinput); 1106 if (ctlfunc) { 1107 (void) (*ctlfunc)(code, (struct sockaddr *)&icmp6dst, 1108 &ip6cp); 1109 } 1110 } 1111 return(0); 1112 1113 freeit: 1114 m_freem(m); 1115 return(-1); 1116} 1117 1118void 1119icmp6_mtudisc_update(ip6cp, validated) 1120 struct ip6ctlparam *ip6cp; 1121 int validated; 1122{ 1123 unsigned long rtcount; 1124 struct icmp6_mtudisc_callback *mc; 1125 struct in6_addr *dst = ip6cp->ip6c_finaldst; 1126 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6; 1127 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */ 1128 u_int mtu = ntohl(icmp6->icmp6_mtu); 1129 struct rtentry *rt = NULL; 1130 struct sockaddr_in6 sin6; 1131 1132 /* 1133 * allow non-validated cases if memory is plenty, to make traffic 1134 * from non-connected pcb happy. 1135 */ 1136 rtcount = rt_timer_count(icmp6_mtudisc_timeout_q); 1137 if (validated) { 1138 if (0 <= icmp6_mtudisc_hiwat && rtcount > icmp6_mtudisc_hiwat) 1139 return; 1140 else if (0 <= icmp6_mtudisc_lowat && 1141 rtcount > icmp6_mtudisc_lowat) { 1142 /* 1143 * XXX nuke a victim, install the new one. 1144 */ 1145 } 1146 } else { 1147 if (0 <= icmp6_mtudisc_lowat && rtcount > icmp6_mtudisc_lowat) 1148 return; 1149 } 1150 1151 bzero(&sin6, sizeof(sin6)); 1152 sin6.sin6_family = PF_INET6; 1153 sin6.sin6_len = sizeof(struct sockaddr_in6); 1154 sin6.sin6_addr = *dst; 1155 /* XXX normally, this won't happen */ 1156 if (IN6_IS_ADDR_LINKLOCAL(dst)) { 1157 sin6.sin6_addr.s6_addr16[1] = 1158 htons(m->m_pkthdr.rcvif->if_index); 1159 } 1160 /* sin6.sin6_scope_id = XXX: should be set if DST is a scoped addr */ 1161 rt = icmp6_mtudisc_clone((struct sockaddr *)&sin6); 1162 1163 if (rt && (rt->rt_flags & RTF_HOST) 1164 && !(rt->rt_rmx.rmx_locks & RTV_MTU)) { 1165 if (mtu < IPV6_MMTU) { 1166 /* xxx */ 1167 rt->rt_rmx.rmx_locks |= RTV_MTU; 1168 } else if (mtu < rt->rt_ifp->if_mtu && 1169 rt->rt_rmx.rmx_mtu > mtu) { 1170 icmp6stat.icp6s_pmtuchg++; 1171 rt->rt_rmx.rmx_mtu = mtu; 1172 } 1173 } 1174 if (rt) 1175 RTFREE(rt); 1176 1177 /* 1178 * Notify protocols that the MTU for this destination 1179 * has changed. 1180 */ 1181 for (mc = LIST_FIRST(&icmp6_mtudisc_callbacks); mc != NULL; 1182 mc = LIST_NEXT(mc, mc_list)) 1183 (*mc->mc_func)(&sin6.sin6_addr); 1184} 1185 1186/* 1187 * Process a Node Information Query packet, based on 1188 * draft-ietf-ipngwg-icmp-name-lookups-07. 1189 * 1190 * Spec incompatibilities: 1191 * - IPv6 Subject address handling 1192 * - IPv4 Subject address handling support missing 1193 * - Proxy reply (answer even if it's not for me) 1194 * - joins NI group address at in6_ifattach() time only, does not cope 1195 * with hostname changes by sethostname(3) 1196 */ 1197#ifndef offsetof /* XXX */ 1198#define offsetof(type, member) ((size_t)(&((type *)0)->member)) 1199#endif 1200static struct mbuf * 1201ni6_input(m, off) 1202 struct mbuf *m; 1203 int off; 1204{ 1205 struct icmp6_nodeinfo *ni6, *nni6; 1206 struct mbuf *n = NULL; 1207 u_int16_t qtype; 1208 int subjlen; 1209 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1210 struct ni_reply_fqdn *fqdn; 1211 int addrs; /* for NI_QTYPE_NODEADDR */ 1212 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */ 1213 struct sockaddr_in6 sin6; /* double meaning; ip6_dst and subjectaddr */ 1214 struct ip6_hdr *ip6; 1215 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */ 1216 char *subj = NULL; 1217 1218 ip6 = mtod(m, struct ip6_hdr *); 1219#ifndef PULLDOWN_TEST 1220 ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off); 1221#else 1222 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6)); 1223 if (ni6 == NULL) { 1224 /* m is already reclaimed */ 1225 return NULL; 1226 } 1227#endif 1228 1229 /* 1230 * Validate IPv6 destination address. 1231 * 1232 * The Responder must discard the Query without further processing 1233 * unless it is one of the Responder's unicast or anycast addresses, or 1234 * a link-local scope multicast address which the Responder has joined. 1235 * [icmp-name-lookups-07, Section 4.] 1236 */ 1237 bzero(&sin6, sizeof(sin6)); 1238 sin6.sin6_family = AF_INET6; 1239 sin6.sin6_len = sizeof(struct sockaddr_in6); 1240 bcopy(&ip6->ip6_dst, &sin6.sin6_addr, sizeof(sin6.sin6_addr)); 1241 /* XXX scopeid */ 1242 if (ifa_ifwithaddr((struct sockaddr *)&sin6)) 1243 ; /* unicast/anycast, fine */ 1244 else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr)) 1245 ; /* link-local multicast, fine */ 1246 else 1247 goto bad; 1248 1249 /* validate query Subject field. */ 1250 qtype = ntohs(ni6->ni_qtype); 1251 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo); 1252 switch (qtype) { 1253 case NI_QTYPE_NOOP: 1254 case NI_QTYPE_SUPTYPES: 1255 /* 07 draft */ 1256 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0) 1257 break; 1258 /*FALLTHROUGH*/ 1259 case NI_QTYPE_FQDN: 1260 case NI_QTYPE_NODEADDR: 1261 switch (ni6->ni_code) { 1262 case ICMP6_NI_SUBJ_IPV6: 1263#if ICMP6_NI_SUBJ_IPV6 != 0 1264 case 0: 1265#endif 1266 /* 1267 * backward compatibility - try to accept 03 draft 1268 * format, where no Subject is present. 1269 */ 1270 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 && 1271 subjlen == 0) { 1272 oldfqdn++; 1273 break; 1274 } 1275#if ICMP6_NI_SUBJ_IPV6 != 0 1276 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6) 1277 goto bad; 1278#endif 1279 1280 if (subjlen != sizeof(sin6.sin6_addr)) 1281 goto bad; 1282 1283 /* 1284 * Validate Subject address. 1285 * 1286 * Not sure what exactly "address belongs to the node" 1287 * means in the spec, is it just unicast, or what? 1288 * 1289 * At this moment we consider Subject address as 1290 * "belong to the node" if the Subject address equals 1291 * to the IPv6 destination address; validation for 1292 * IPv6 destination address should have done enough 1293 * check for us. 1294 * 1295 * We do not do proxy at this moment. 1296 */ 1297 /* m_pulldown instead of copy? */ 1298 m_copydata(m, off + sizeof(struct icmp6_nodeinfo), 1299 subjlen, (caddr_t)&sin6.sin6_addr); 1300 /* XXX kame scope hack */ 1301 if (IN6_IS_SCOPE_LINKLOCAL(&sin6.sin6_addr)) { 1302#ifdef FAKE_LOOPBACK_IF 1303 if ((m->m_flags & M_PKTHDR) != 0 && 1304 m->m_pkthdr.rcvif) { 1305 sin6.sin6_addr.s6_addr16[1] = 1306 htons(m->m_pkthdr.rcvif->if_index); 1307 } 1308#else 1309 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 1310 sin6.sin6_addr.s6_addr16[1] = 1311 ip6->ip6_dst.s6_addr16[1]; 1312 } 1313#endif 1314 } 1315 subj = (char *)&sin6; 1316 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &sin6.sin6_addr)) 1317 break; 1318 1319 /* 1320 * XXX if we are to allow other cases, we should really 1321 * be careful about scope here. 1322 * basically, we should disallow queries toward IPv6 1323 * destination X with subject Y, if scope(X) > scope(Y). 1324 * if we allow scope(X) > scope(Y), it will result in 1325 * information leakage across scope boundary. 1326 */ 1327 goto bad; 1328 1329 case ICMP6_NI_SUBJ_FQDN: 1330 /* 1331 * Validate Subject name with gethostname(3). 1332 * 1333 * The behavior may need some debate, since: 1334 * - we are not sure if the node has FQDN as 1335 * hostname (returned by gethostname(3)). 1336 * - the code does wildcard match for truncated names. 1337 * however, we are not sure if we want to perform 1338 * wildcard match, if gethostname(3) side has 1339 * truncated hostname. 1340 */ 1341 n = ni6_nametodns(hostname, hostnamelen, 0); 1342 if (!n || n->m_next || n->m_len == 0) 1343 goto bad; 1344 IP6_EXTHDR_GET(subj, char *, m, 1345 off + sizeof(struct icmp6_nodeinfo), subjlen); 1346 if (subj == NULL) 1347 goto bad; 1348 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *), 1349 n->m_len)) { 1350 goto bad; 1351 } 1352 m_freem(n); 1353 n = NULL; 1354 break; 1355 1356 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */ 1357 default: 1358 goto bad; 1359 } 1360 break; 1361 } 1362 1363 /* guess reply length */ 1364 switch (qtype) { 1365 case NI_QTYPE_NOOP: 1366 break; /* no reply data */ 1367 case NI_QTYPE_SUPTYPES: 1368 replylen += sizeof(u_int32_t); 1369 break; 1370 case NI_QTYPE_FQDN: 1371 /* XXX will append an mbuf */ 1372 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1373 break; 1374 case NI_QTYPE_NODEADDR: 1375 addrs = ni6_addrs(ni6, m, &ifp, subj); 1376 if ((replylen += addrs * (sizeof(struct in6_addr) + 1377 sizeof(u_int32_t))) > MCLBYTES) 1378 replylen = MCLBYTES; /* XXX: will truncate pkt later */ 1379 break; 1380 default: 1381 /* 1382 * XXX: We must return a reply with the ICMP6 code 1383 * `unknown Qtype' in this case. However we regard the case 1384 * as an FQDN query for backward compatibility. 1385 * Older versions set a random value to this field, 1386 * so it rarely varies in the defined qtypes. 1387 * But the mechanism is not reliable... 1388 * maybe we should obsolete older versions. 1389 */ 1390 qtype = NI_QTYPE_FQDN; 1391 /* XXX will append an mbuf */ 1392 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1393 oldfqdn++; 1394 break; 1395 } 1396 1397 /* allocate an mbuf to reply. */ 1398 MGETHDR(n, M_DONTWAIT, m->m_type); 1399 if (n == NULL) { 1400 m_freem(m); 1401 return(NULL); 1402 } 1403 M_COPY_PKTHDR(n, m); /* just for recvif */ 1404 if (replylen > MHLEN) { 1405 if (replylen > MCLBYTES) { 1406 /* 1407 * XXX: should we try to allocate more? But MCLBYTES 1408 * is probably much larger than IPV6_MMTU... 1409 */ 1410 goto bad; 1411 } 1412 MCLGET(n, M_DONTWAIT); 1413 if ((n->m_flags & M_EXT) == 0) { 1414 goto bad; 1415 } 1416 } 1417 n->m_pkthdr.len = n->m_len = replylen; 1418 1419 /* copy mbuf header and IPv6 + Node Information base headers */ 1420 bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr)); 1421 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1); 1422 bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo)); 1423 1424 /* qtype dependent procedure */ 1425 switch (qtype) { 1426 case NI_QTYPE_NOOP: 1427 nni6->ni_code = ICMP6_NI_SUCCESS; 1428 nni6->ni_flags = 0; 1429 break; 1430 case NI_QTYPE_SUPTYPES: 1431 { 1432 u_int32_t v; 1433 nni6->ni_code = ICMP6_NI_SUCCESS; 1434 nni6->ni_flags = htons(0x0000); /* raw bitmap */ 1435 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */ 1436 v = (u_int32_t)htonl(0x0000000f); 1437 bcopy(&v, nni6 + 1, sizeof(u_int32_t)); 1438 break; 1439 } 1440 case NI_QTYPE_FQDN: 1441 nni6->ni_code = ICMP6_NI_SUCCESS; 1442 fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) + 1443 sizeof(struct ip6_hdr) + 1444 sizeof(struct icmp6_nodeinfo)); 1445 nni6->ni_flags = 0; /* XXX: meaningless TTL */ 1446 fqdn->ni_fqdn_ttl = 0; /* ditto. */ 1447 /* 1448 * XXX do we really have FQDN in variable "hostname"? 1449 */ 1450 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn); 1451 if (n->m_next == NULL) 1452 goto bad; 1453 /* XXX we assume that n->m_next is not a chain */ 1454 if (n->m_next->m_next != NULL) 1455 goto bad; 1456 n->m_pkthdr.len += n->m_next->m_len; 1457 break; 1458 case NI_QTYPE_NODEADDR: 1459 { 1460 int lenlim, copied; 1461 1462 nni6->ni_code = ICMP6_NI_SUCCESS; 1463 n->m_pkthdr.len = n->m_len = 1464 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1465 lenlim = M_TRAILINGSPACE(n); 1466 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim); 1467 /* XXX: reset mbuf length */ 1468 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 1469 sizeof(struct icmp6_nodeinfo) + copied; 1470 break; 1471 } 1472 default: 1473 break; /* XXX impossible! */ 1474 } 1475 1476 nni6->ni_type = ICMP6_NI_REPLY; 1477 m_freem(m); 1478 return(n); 1479 1480 bad: 1481 m_freem(m); 1482 if (n) 1483 m_freem(n); 1484 return(NULL); 1485} 1486#undef hostnamelen 1487 1488/* 1489 * make a mbuf with DNS-encoded string. no compression support. 1490 * 1491 * XXX names with less than 2 dots (like "foo" or "foo.section") will be 1492 * treated as truncated name (two \0 at the end). this is a wild guess. 1493 */ 1494static struct mbuf * 1495ni6_nametodns(name, namelen, old) 1496 const char *name; 1497 int namelen; 1498 int old; /* return pascal string if non-zero */ 1499{ 1500 struct mbuf *m; 1501 char *cp, *ep; 1502 const char *p, *q; 1503 int i, len, nterm; 1504 1505 if (old) 1506 len = namelen + 1; 1507 else 1508 len = MCLBYTES; 1509 1510 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */ 1511 MGET(m, M_DONTWAIT, MT_DATA); 1512 if (m && len > MLEN) { 1513 MCLGET(m, M_DONTWAIT); 1514 if ((m->m_flags & M_EXT) == 0) 1515 goto fail; 1516 } 1517 if (!m) 1518 goto fail; 1519 m->m_next = NULL; 1520 1521 if (old) { 1522 m->m_len = len; 1523 *mtod(m, char *) = namelen; 1524 bcopy(name, mtod(m, char *) + 1, namelen); 1525 return m; 1526 } else { 1527 m->m_len = 0; 1528 cp = mtod(m, char *); 1529 ep = mtod(m, char *) + M_TRAILINGSPACE(m); 1530 1531 /* if not certain about my name, return empty buffer */ 1532 if (namelen == 0) 1533 return m; 1534 1535 /* 1536 * guess if it looks like shortened hostname, or FQDN. 1537 * shortened hostname needs two trailing "\0". 1538 */ 1539 i = 0; 1540 for (p = name; p < name + namelen; p++) { 1541 if (*p && *p == '.') 1542 i++; 1543 } 1544 if (i < 2) 1545 nterm = 2; 1546 else 1547 nterm = 1; 1548 1549 p = name; 1550 while (cp < ep && p < name + namelen) { 1551 i = 0; 1552 for (q = p; q < name + namelen && *q && *q != '.'; q++) 1553 i++; 1554 /* result does not fit into mbuf */ 1555 if (cp + i + 1 >= ep) 1556 goto fail; 1557 /* DNS label length restriction, RFC1035 page 8 */ 1558 if (i >= 64) 1559 goto fail; 1560 *cp++ = i; 1561 bcopy(p, cp, i); 1562 cp += i; 1563 p = q; 1564 if (p < name + namelen && *p == '.') 1565 p++; 1566 } 1567 /* termination */ 1568 if (cp + nterm >= ep) 1569 goto fail; 1570 while (nterm-- > 0) 1571 *cp++ = '\0'; 1572 m->m_len = cp - mtod(m, char *); 1573 return m; 1574 } 1575 1576 panic("should not reach here"); 1577 /*NOTREACHED*/ 1578 1579 fail: 1580 if (m) 1581 m_freem(m); 1582 return NULL; 1583} 1584 1585/* 1586 * check if two DNS-encoded string matches. takes care of truncated 1587 * form (with \0\0 at the end). no compression support. 1588 * XXX upper/lowercase match (see RFC2065) 1589 */ 1590static int 1591ni6_dnsmatch(a, alen, b, blen) 1592 const char *a; 1593 int alen; 1594 const char *b; 1595 int blen; 1596{ 1597 const char *a0, *b0; 1598 int l; 1599 1600 /* simplest case - need validation? */ 1601 if (alen == blen && bcmp(a, b, alen) == 0) 1602 return 1; 1603 1604 a0 = a; 1605 b0 = b; 1606 1607 /* termination is mandatory */ 1608 if (alen < 2 || blen < 2) 1609 return 0; 1610 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0') 1611 return 0; 1612 alen--; 1613 blen--; 1614 1615 while (a - a0 < alen && b - b0 < blen) { 1616 if (a - a0 + 1 > alen || b - b0 + 1 > blen) 1617 return 0; 1618 1619 if ((signed char)a[0] < 0 || (signed char)b[0] < 0) 1620 return 0; 1621 /* we don't support compression yet */ 1622 if (a[0] >= 64 || b[0] >= 64) 1623 return 0; 1624 1625 /* truncated case */ 1626 if (a[0] == 0 && a - a0 == alen - 1) 1627 return 1; 1628 if (b[0] == 0 && b - b0 == blen - 1) 1629 return 1; 1630 if (a[0] == 0 || b[0] == 0) 1631 return 0; 1632 1633 if (a[0] != b[0]) 1634 return 0; 1635 l = a[0]; 1636 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen) 1637 return 0; 1638 if (bcmp(a + 1, b + 1, l) != 0) 1639 return 0; 1640 1641 a += 1 + l; 1642 b += 1 + l; 1643 } 1644 1645 if (a - a0 == alen && b - b0 == blen) 1646 return 1; 1647 else 1648 return 0; 1649} 1650 1651/* 1652 * calculate the number of addresses to be returned in the node info reply. 1653 */ 1654static int 1655ni6_addrs(ni6, m, ifpp, subj) 1656 struct icmp6_nodeinfo *ni6; 1657 struct mbuf *m; 1658 struct ifnet **ifpp; 1659 char *subj; 1660{ 1661 struct ifnet *ifp; 1662 struct in6_ifaddr *ifa6; 1663 struct ifaddr *ifa; 1664 struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */ 1665 int addrs = 0, addrsofif, iffound = 0; 1666 int niflags = ni6->ni_flags; 1667 1668 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) { 1669 switch (ni6->ni_code) { 1670 case ICMP6_NI_SUBJ_IPV6: 1671 if (subj == NULL) /* must be impossible... */ 1672 return(0); 1673 subj_ip6 = (struct sockaddr_in6 *)subj; 1674 break; 1675 default: 1676 /* 1677 * XXX: we only support IPv6 subject address for 1678 * this Qtype. 1679 */ 1680 return(0); 1681 } 1682 } 1683 1684 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) 1685 { 1686 addrsofif = 0; 1687 for (ifa = ifp->if_addrlist.tqh_first; ifa; 1688 ifa = ifa->ifa_list.tqe_next) 1689 { 1690 if (ifa->ifa_addr->sa_family != AF_INET6) 1691 continue; 1692 ifa6 = (struct in6_ifaddr *)ifa; 1693 1694 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 && 1695 IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr, 1696 &ifa6->ia_addr.sin6_addr)) 1697 iffound = 1; 1698 1699 /* 1700 * IPv4-mapped addresses can only be returned by a 1701 * Node Information proxy, since they represent 1702 * addresses of IPv4-only nodes, which perforce do 1703 * not implement this protocol. 1704 * [icmp-name-lookups-07, Section 5.4] 1705 * So we don't support NI_NODEADDR_FLAG_COMPAT in 1706 * this function at this moment. 1707 */ 1708 1709 /* What do we have to do about ::1? */ 1710 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) { 1711 case IPV6_ADDR_SCOPE_LINKLOCAL: 1712 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1713 continue; 1714 break; 1715 case IPV6_ADDR_SCOPE_SITELOCAL: 1716 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1717 continue; 1718 break; 1719 case IPV6_ADDR_SCOPE_GLOBAL: 1720 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1721 continue; 1722 break; 1723 default: 1724 continue; 1725 } 1726 1727 /* 1728 * check if anycast is okay. 1729 * XXX: just experimental. not in the spec. 1730 */ 1731 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1732 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 1733 continue; /* we need only unicast addresses */ 1734 1735 addrsofif++; /* count the address */ 1736 } 1737 if (iffound) { 1738 *ifpp = ifp; 1739 return(addrsofif); 1740 } 1741 1742 addrs += addrsofif; 1743 } 1744 1745 return(addrs); 1746} 1747 1748static int 1749ni6_store_addrs(ni6, nni6, ifp0, resid) 1750 struct icmp6_nodeinfo *ni6, *nni6; 1751 struct ifnet *ifp0; 1752 int resid; 1753{ 1754 struct ifnet *ifp = ifp0 ? ifp0 : TAILQ_FIRST(&ifnet); 1755 struct in6_ifaddr *ifa6; 1756 struct ifaddr *ifa; 1757 struct ifnet *ifp_dep = NULL; 1758 int copied = 0, allow_deprecated = 0; 1759 u_char *cp = (u_char *)(nni6 + 1); 1760 int niflags = ni6->ni_flags; 1761 u_int32_t ltime; 1762 long time_second = time.tv_sec; 1763 1764 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL)) 1765 return(0); /* needless to copy */ 1766 1767 again: 1768 1769 for (; ifp; ifp = TAILQ_NEXT(ifp, if_list)) 1770 { 1771 for (ifa = ifp->if_addrlist.tqh_first; ifa; 1772 ifa = ifa->ifa_list.tqe_next) 1773 { 1774 if (ifa->ifa_addr->sa_family != AF_INET6) 1775 continue; 1776 ifa6 = (struct in6_ifaddr *)ifa; 1777 1778 if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) != 0 && 1779 allow_deprecated == 0) { 1780 /* 1781 * prefererred address should be put before 1782 * deprecated addresses. 1783 */ 1784 1785 /* record the interface for later search */ 1786 if (ifp_dep == NULL) 1787 ifp_dep = ifp; 1788 1789 continue; 1790 } 1791 else if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) == 0 && 1792 allow_deprecated != 0) 1793 continue; /* we now collect deprecated addrs */ 1794 1795 /* What do we have to do about ::1? */ 1796 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) { 1797 case IPV6_ADDR_SCOPE_LINKLOCAL: 1798 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1799 continue; 1800 break; 1801 case IPV6_ADDR_SCOPE_SITELOCAL: 1802 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1803 continue; 1804 break; 1805 case IPV6_ADDR_SCOPE_GLOBAL: 1806 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1807 continue; 1808 break; 1809 default: 1810 continue; 1811 } 1812 1813 /* 1814 * check if anycast is okay. 1815 * XXX: just experimental. not in the spec. 1816 */ 1817 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1818 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 1819 continue; 1820 1821 /* now we can copy the address */ 1822 if (resid < sizeof(struct in6_addr) + 1823 sizeof(u_int32_t)) { 1824 /* 1825 * We give up much more copy. 1826 * Set the truncate flag and return. 1827 */ 1828 nni6->ni_flags |= 1829 NI_NODEADDR_FLAG_TRUNCATE; 1830 return(copied); 1831 } 1832 1833 /* 1834 * Set the TTL of the address. 1835 * The TTL value should be one of the following 1836 * according to the specification: 1837 * 1838 * 1. The remaining lifetime of a DHCP lease on the 1839 * address, or 1840 * 2. The remaining Valid Lifetime of a prefix from 1841 * which the address was derived through Stateless 1842 * Autoconfiguration. 1843 * 1844 * Note that we currently do not support stateful 1845 * address configuration by DHCPv6, so the former 1846 * case can't happen. 1847 */ 1848 if (ifa6->ia6_lifetime.ia6t_expire == 0) 1849 ltime = ND6_INFINITE_LIFETIME; 1850 else { 1851 if (ifa6->ia6_lifetime.ia6t_expire > 1852 time_second) 1853 ltime = htonl(ifa6->ia6_lifetime.ia6t_expire - time_second); 1854 else 1855 ltime = 0; 1856 } 1857 1858 bcopy(<ime, cp, sizeof(u_int32_t)); 1859 cp += sizeof(u_int32_t); 1860 1861 /* copy the address itself */ 1862 bcopy(&ifa6->ia_addr.sin6_addr, cp, 1863 sizeof(struct in6_addr)); 1864 /* XXX: KAME link-local hack; remove ifindex */ 1865 if (IN6_IS_ADDR_LINKLOCAL(&ifa6->ia_addr.sin6_addr)) 1866 ((struct in6_addr *)cp)->s6_addr16[1] = 0; 1867 cp += sizeof(struct in6_addr); 1868 1869 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1870 copied += (sizeof(struct in6_addr) + 1871 sizeof(u_int32_t)); 1872 } 1873 if (ifp0) /* we need search only on the specified IF */ 1874 break; 1875 } 1876 1877 if (allow_deprecated == 0 && ifp_dep != NULL) { 1878 ifp = ifp_dep; 1879 allow_deprecated = 1; 1880 1881 goto again; 1882 } 1883 1884 return(copied); 1885} 1886 1887/* 1888 * XXX almost dup'ed code with rip6_input. 1889 */ 1890static int 1891icmp6_rip6_input(mp, off) 1892 struct mbuf **mp; 1893 int off; 1894{ 1895 struct mbuf *m = *mp; 1896 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1897 struct in6pcb *in6p; 1898 struct in6pcb *last = NULL; 1899 struct sockaddr_in6 rip6src; 1900 struct icmp6_hdr *icmp6; 1901 struct mbuf *opts = NULL; 1902 1903#ifndef PULLDOWN_TEST 1904 /* this is assumed to be safe. */ 1905 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off); 1906#else 1907 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 1908 if (icmp6 == NULL) { 1909 /* m is already reclaimed */ 1910 return IPPROTO_DONE; 1911 } 1912#endif 1913 1914 bzero(&rip6src, sizeof(rip6src)); 1915 rip6src.sin6_len = sizeof(struct sockaddr_in6); 1916 rip6src.sin6_family = AF_INET6; 1917 /* KAME hack: recover scopeid */ 1918 (void)in6_recoverscope(&rip6src, &ip6->ip6_src, m->m_pkthdr.rcvif); 1919 1920 for (in6p = rawin6pcb.in6p_next; 1921 in6p != &rawin6pcb; in6p = in6p->in6p_next) 1922 { 1923 if (in6p->in6p_ip6_nxt != IPPROTO_ICMPV6) 1924 continue; 1925 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && 1926 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst)) 1927 continue; 1928 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) && 1929 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src)) 1930 continue; 1931 if (in6p->in6p_icmp6filt 1932 && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type, 1933 in6p->in6p_icmp6filt)) 1934 continue; 1935 if (last) { 1936 struct mbuf *n; 1937 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { 1938 if (last->in6p_flags & IN6P_CONTROLOPTS) 1939 ip6_savecontrol(last, &opts, ip6, n); 1940 /* strip intermediate headers */ 1941 m_adj(n, off); 1942 if (sbappendaddr(&last->in6p_socket->so_rcv, 1943 (struct sockaddr *)&rip6src, 1944 n, opts) == 0) { 1945 /* should notify about lost packet */ 1946 m_freem(n); 1947 if (opts) 1948 m_freem(opts); 1949 } else 1950 sorwakeup(last->in6p_socket); 1951 opts = NULL; 1952 } 1953 } 1954 last = in6p; 1955 } 1956 if (last) { 1957 if (last->in6p_flags & IN6P_CONTROLOPTS) 1958 ip6_savecontrol(last, &opts, ip6, m); 1959 /* strip intermediate headers */ 1960 m_adj(m, off); 1961 if (sbappendaddr(&last->in6p_socket->so_rcv, 1962 (struct sockaddr *)&rip6src, m, opts) == 0) { 1963 m_freem(m); 1964 if (opts) 1965 m_freem(opts); 1966 } else 1967 sorwakeup(last->in6p_socket); 1968 } else { 1969 m_freem(m); 1970 ip6stat.ip6s_delivered--; 1971 } 1972 return IPPROTO_DONE; 1973} 1974 1975/* 1976 * Reflect the ip6 packet back to the source. 1977 * OFF points to the icmp6 header, counted from the top of the mbuf. 1978 */ 1979void 1980icmp6_reflect(m, off) 1981 struct mbuf *m; 1982 size_t off; 1983{ 1984 struct ip6_hdr *ip6; 1985 struct icmp6_hdr *icmp6; 1986 struct in6_ifaddr *ia; 1987 struct in6_addr t, *src = 0; 1988 int plen; 1989 int type, code; 1990 struct ifnet *outif = NULL; 1991 struct sockaddr_in6 sa6_src, sa6_dst; 1992#ifdef COMPAT_RFC1885 1993 int mtu = IPV6_MMTU; 1994 struct sockaddr_in6 *sin6 = &icmp6_reflect_rt.ro_dst; 1995#endif 1996 1997 /* too short to reflect */ 1998 if (off < sizeof(struct ip6_hdr)) { 1999 nd6log((LOG_DEBUG, 2000 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n", 2001 (u_long)off, (u_long)sizeof(struct ip6_hdr), 2002 __FILE__, __LINE__)); 2003 goto bad; 2004 } 2005 2006 /* 2007 * If there are extra headers between IPv6 and ICMPv6, strip 2008 * off that header first. 2009 */ 2010#ifdef DIAGNOSTIC 2011 if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN) 2012 panic("assumption failed in icmp6_reflect"); 2013#endif 2014 if (off > sizeof(struct ip6_hdr)) { 2015 size_t l; 2016 struct ip6_hdr nip6; 2017 2018 l = off - sizeof(struct ip6_hdr); 2019 m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6); 2020 m_adj(m, l); 2021 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2022 if (m->m_len < l) { 2023 if ((m = m_pullup(m, l)) == NULL) 2024 return; 2025 } 2026 bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6)); 2027 } else /* off == sizeof(struct ip6_hdr) */ { 2028 size_t l; 2029 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2030 if (m->m_len < l) { 2031 if ((m = m_pullup(m, l)) == NULL) 2032 return; 2033 } 2034 } 2035 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr); 2036 ip6 = mtod(m, struct ip6_hdr *); 2037 ip6->ip6_nxt = IPPROTO_ICMPV6; 2038 icmp6 = (struct icmp6_hdr *)(ip6 + 1); 2039 type = icmp6->icmp6_type; /* keep type for statistics */ 2040 code = icmp6->icmp6_code; /* ditto. */ 2041 2042 t = ip6->ip6_dst; 2043 /* 2044 * ip6_input() drops a packet if its src is multicast. 2045 * So, the src is never multicast. 2046 */ 2047 ip6->ip6_dst = ip6->ip6_src; 2048 2049 /* 2050 * XXX: make sure to embed scope zone information, using 2051 * already embedded IDs or the received interface (if any). 2052 * Note that rcvif may be NULL. 2053 * TODO: scoped routing case (XXX). 2054 */ 2055 bzero(&sa6_src, sizeof(sa6_src)); 2056 sa6_src.sin6_family = AF_INET6; 2057 sa6_src.sin6_len = sizeof(sa6_src); 2058 sa6_src.sin6_addr = ip6->ip6_dst; 2059 in6_recoverscope(&sa6_src, &ip6->ip6_dst, m->m_pkthdr.rcvif); 2060 in6_embedscope(&ip6->ip6_dst, &sa6_src, NULL, NULL); 2061 bzero(&sa6_dst, sizeof(sa6_dst)); 2062 sa6_dst.sin6_family = AF_INET6; 2063 sa6_dst.sin6_len = sizeof(sa6_dst); 2064 sa6_dst.sin6_addr = t; 2065 in6_recoverscope(&sa6_dst, &t, m->m_pkthdr.rcvif); 2066 in6_embedscope(&t, &sa6_dst, NULL, NULL); 2067 2068#ifdef COMPAT_RFC1885 2069 /* 2070 * xxx guess MTU 2071 * RFC 1885 requires that echo reply should be truncated if it 2072 * does not fit in with (return) path MTU, but the description was 2073 * removed in the new spec. 2074 */ 2075 if (icmp6_reflect_rt.ro_rt == 0 || 2076 ! (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &ip6->ip6_dst))) { 2077 if (icmp6_reflect_rt.ro_rt) { 2078 RTFREE(icmp6_reflect_rt.ro_rt); 2079 icmp6_reflect_rt.ro_rt = 0; 2080 } 2081 bzero(sin6, sizeof(*sin6)); 2082 sin6->sin6_family = PF_INET6; 2083 sin6->sin6_len = sizeof(struct sockaddr_in6); 2084 sin6->sin6_addr = ip6->ip6_dst; 2085 2086 rtalloc((struct route *)&icmp6_reflect_rt.ro_rt); 2087 } 2088 2089 if (icmp6_reflect_rt.ro_rt == 0) 2090 goto bad; 2091 2092 if ((icmp6_reflect_rt.ro_rt->rt_flags & RTF_HOST) 2093 && mtu < icmp6_reflect_rt.ro_rt->rt_ifp->if_mtu) 2094 mtu = icmp6_reflect_rt.ro_rt->rt_rmx.rmx_mtu; 2095 2096 if (mtu < m->m_pkthdr.len) { 2097 plen -= (m->m_pkthdr.len - mtu); 2098 m_adj(m, mtu - m->m_pkthdr.len); 2099 } 2100#endif 2101 /* 2102 * If the incoming packet was addressed directly to us(i.e. unicast), 2103 * use dst as the src for the reply. 2104 * The IN6_IFF_NOTREADY case would be VERY rare, but is possible 2105 * (for example) when we encounter an error while forwarding procedure 2106 * destined to a duplicated address of ours. 2107 */ 2108 for (ia = in6_ifaddr; ia; ia = ia->ia_next) 2109 if (IN6_ARE_ADDR_EQUAL(&t, &ia->ia_addr.sin6_addr) && 2110 (ia->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) { 2111 src = &t; 2112 break; 2113 } 2114 if (ia == NULL && IN6_IS_ADDR_LINKLOCAL(&t) && (m->m_flags & M_LOOP)) { 2115 /* 2116 * This is the case if the dst is our link-local address 2117 * and the sender is also ourseleves. 2118 */ 2119 src = &t; 2120 } 2121 2122 if (src == 0) { 2123 int e; 2124 struct route_in6 ro; 2125 2126 /* 2127 * This case matches to multicasts, our anycast, or unicasts 2128 * that we do not own. Select a source address based on the 2129 * source address of the erroneous packet. 2130 */ 2131 bzero(&ro, sizeof(ro)); 2132 src = in6_selectsrc(&sa6_src, NULL, NULL, &ro, NULL, &e); 2133 if (ro.ro_rt) 2134 RTFREE(ro.ro_rt); /* XXX: we could use this */ 2135 if (src == NULL) { 2136 nd6log((LOG_DEBUG, 2137 "icmp6_reflect: source can't be determined: " 2138 "dst=%s, error=%d\n", 2139 ip6_sprintf(&sa6_src.sin6_addr), e)); 2140 goto bad; 2141 } 2142 } 2143 2144 ip6->ip6_src = *src; 2145 2146 ip6->ip6_flow = 0; 2147 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2148 ip6->ip6_vfc |= IPV6_VERSION; 2149 ip6->ip6_nxt = IPPROTO_ICMPV6; 2150 if (m->m_pkthdr.rcvif) { 2151 /* XXX: This may not be the outgoing interface */ 2152 ip6->ip6_hlim = nd_ifinfo[m->m_pkthdr.rcvif->if_index].chlim; 2153 } 2154 2155 icmp6->icmp6_cksum = 0; 2156 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6, 2157 sizeof(struct ip6_hdr), plen); 2158 2159 /* 2160 * xxx option handling 2161 */ 2162 2163 m->m_flags &= ~(M_BCAST|M_MCAST); 2164#ifdef IPSEC 2165 /* Don't lookup socket */ 2166 (void)ipsec_setsocket(m, NULL); 2167#endif /*IPSEC*/ 2168 2169#ifdef COMPAT_RFC1885 2170 ip6_output(m, NULL, &icmp6_reflect_rt, 0, NULL, &outif); 2171#else 2172 ip6_output(m, NULL, NULL, 0, NULL, &outif); 2173#endif 2174 if (outif) 2175 icmp6_ifoutstat_inc(outif, type, code); 2176 2177 return; 2178 2179 bad: 2180 m_freem(m); 2181 return; 2182} 2183 2184void 2185icmp6_fasttimo() 2186{ 2187 2188 mld6_fasttimeo(); 2189} 2190 2191static const char * 2192icmp6_redirect_diag(src6, dst6, tgt6) 2193 struct in6_addr *src6; 2194 struct in6_addr *dst6; 2195 struct in6_addr *tgt6; 2196{ 2197 static char buf[1024]; 2198 snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)", 2199 ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6)); 2200 return buf; 2201} 2202 2203void 2204icmp6_redirect_input(m, off) 2205 struct mbuf *m; 2206 int off; 2207{ 2208 struct ifnet *ifp = m->m_pkthdr.rcvif; 2209 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 2210 struct nd_redirect *nd_rd; 2211 int icmp6len = ntohs(ip6->ip6_plen); 2212 char *lladdr = NULL; 2213 int lladdrlen = 0; 2214 u_char *redirhdr = NULL; 2215 int redirhdrlen = 0; 2216 struct rtentry *rt = NULL; 2217 int is_router; 2218 int is_onlink; 2219 struct in6_addr src6 = ip6->ip6_src; 2220 struct in6_addr redtgt6; 2221 struct in6_addr reddst6; 2222 union nd_opts ndopts; 2223 2224 if (!m || !ifp) 2225 return; 2226 2227 /* XXX if we are router, we don't update route by icmp6 redirect */ 2228 if (ip6_forwarding) 2229 goto freeit; 2230 if (!icmp6_rediraccept) 2231 goto freeit; 2232 2233#ifndef PULLDOWN_TEST 2234 IP6_EXTHDR_CHECK(m, off, icmp6len,); 2235 nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off); 2236#else 2237 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len); 2238 if (nd_rd == NULL) { 2239 icmp6stat.icp6s_tooshort++; 2240 return; 2241 } 2242#endif 2243 redtgt6 = nd_rd->nd_rd_target; 2244 reddst6 = nd_rd->nd_rd_dst; 2245 2246 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 2247 redtgt6.s6_addr16[1] = htons(ifp->if_index); 2248 if (IN6_IS_ADDR_LINKLOCAL(&reddst6)) 2249 reddst6.s6_addr16[1] = htons(ifp->if_index); 2250 2251 /* validation */ 2252 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) { 2253 nd6log((LOG_ERR, 2254 "ICMP6 redirect sent from %s rejected; " 2255 "must be from linklocal\n", ip6_sprintf(&src6))); 2256 goto bad; 2257 } 2258 if (ip6->ip6_hlim != 255) { 2259 nd6log((LOG_ERR, 2260 "ICMP6 redirect sent from %s rejected; " 2261 "hlim=%d (must be 255)\n", 2262 ip6_sprintf(&src6), ip6->ip6_hlim)); 2263 goto bad; 2264 } 2265 { 2266 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */ 2267 struct sockaddr_in6 sin6; 2268 struct in6_addr *gw6; 2269 2270 bzero(&sin6, sizeof(sin6)); 2271 sin6.sin6_family = AF_INET6; 2272 sin6.sin6_len = sizeof(struct sockaddr_in6); 2273 bcopy(&reddst6, &sin6.sin6_addr, sizeof(reddst6)); 2274 rt = rtalloc1((struct sockaddr *)&sin6, 0); 2275 if (rt) { 2276 if (rt->rt_gateway == NULL || 2277 rt->rt_gateway->sa_family != AF_INET6) { 2278 nd6log((LOG_ERR, 2279 "ICMP6 redirect rejected; no route " 2280 "with inet6 gateway found for redirect dst: %s\n", 2281 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2282 RTFREE(rt); 2283 goto bad; 2284 } 2285 2286 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr); 2287 if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) { 2288 nd6log((LOG_ERR, 2289 "ICMP6 redirect rejected; " 2290 "not equal to gw-for-src=%s (must be same): " 2291 "%s\n", 2292 ip6_sprintf(gw6), 2293 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2294 RTFREE(rt); 2295 goto bad; 2296 } 2297 } else { 2298 nd6log((LOG_ERR, 2299 "ICMP6 redirect rejected; " 2300 "no route found for redirect dst: %s\n", 2301 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2302 goto bad; 2303 } 2304 RTFREE(rt); 2305 rt = NULL; 2306 } 2307 if (IN6_IS_ADDR_MULTICAST(&reddst6)) { 2308 nd6log((LOG_ERR, 2309 "ICMP6 redirect rejected; " 2310 "redirect dst must be unicast: %s\n", 2311 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2312 goto bad; 2313 } 2314 2315 is_router = is_onlink = 0; 2316 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 2317 is_router = 1; /* router case */ 2318 if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0) 2319 is_onlink = 1; /* on-link destination case */ 2320 if (!is_router && !is_onlink) { 2321 nd6log((LOG_ERR, 2322 "ICMP6 redirect rejected; " 2323 "neither router case nor onlink case: %s\n", 2324 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2325 goto bad; 2326 } 2327 /* validation passed */ 2328 2329 icmp6len -= sizeof(*nd_rd); 2330 nd6_option_init(nd_rd + 1, icmp6len, &ndopts); 2331 if (nd6_options(&ndopts) < 0) { 2332 nd6log((LOG_INFO, "icmp6_redirect_input: " 2333 "invalid ND option, rejected: %s\n", 2334 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2335 /* nd6_options have incremented stats */ 2336 goto freeit; 2337 } 2338 2339 if (ndopts.nd_opts_tgt_lladdr) { 2340 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 2341 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 2342 } 2343 2344 if (ndopts.nd_opts_rh) { 2345 redirhdrlen = ndopts.nd_opts_rh->nd_opt_rh_len; 2346 redirhdr = (u_char *)(ndopts.nd_opts_rh + 1); /* xxx */ 2347 } 2348 2349 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 2350 nd6log((LOG_INFO, 2351 "icmp6_redirect_input: lladdrlen mismatch for %s " 2352 "(if %d, icmp6 packet %d): %s\n", 2353 ip6_sprintf(&redtgt6), ifp->if_addrlen, lladdrlen - 2, 2354 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2355 goto bad; 2356 } 2357 2358 /* RFC 2461 8.3 */ 2359 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT, 2360 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER); 2361 2362 if (!is_onlink) { /* better router case. perform rtredirect. */ 2363 /* perform rtredirect */ 2364 struct sockaddr_in6 sdst; 2365 struct sockaddr_in6 sgw; 2366 struct sockaddr_in6 ssrc; 2367 unsigned long rtcount; 2368 struct rtentry *newrt = NULL; 2369 2370 /* 2371 * do not install redirect route, if the number of entries 2372 * is too much (> hiwat). note that, the node (= host) will 2373 * work just fine even if we do not install redirect route 2374 * (there will be additional hops, though). 2375 */ 2376 rtcount = rt_timer_count(icmp6_redirect_timeout_q); 2377 if (0 <= icmp6_redirect_hiwat && rtcount > icmp6_redirect_hiwat) 2378 return; 2379 else if (0 <= icmp6_redirect_lowat && 2380 rtcount > icmp6_redirect_lowat) { 2381 /* 2382 * XXX nuke a victim, install the new one. 2383 */ 2384 } 2385 2386 bzero(&sdst, sizeof(sdst)); 2387 bzero(&sgw, sizeof(sgw)); 2388 bzero(&ssrc, sizeof(ssrc)); 2389 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6; 2390 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len = 2391 sizeof(struct sockaddr_in6); 2392 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr)); 2393 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2394 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr)); 2395 rtredirect((struct sockaddr *)&sdst, (struct sockaddr *)&sgw, 2396 (struct sockaddr *)NULL, RTF_GATEWAY | RTF_HOST, 2397 (struct sockaddr *)&ssrc, 2398 &newrt); 2399 2400 if (newrt) { 2401 (void)rt_timer_add(newrt, icmp6_redirect_timeout, 2402 icmp6_redirect_timeout_q); 2403 rtfree(newrt); 2404 } 2405 } 2406 /* finally update cached route in each socket via pfctlinput */ 2407 { 2408 struct sockaddr_in6 sdst; 2409 2410 bzero(&sdst, sizeof(sdst)); 2411 sdst.sin6_family = AF_INET6; 2412 sdst.sin6_len = sizeof(struct sockaddr_in6); 2413 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2414 pfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst); 2415#ifdef IPSEC 2416 key_sa_routechange((struct sockaddr *)&sdst); 2417#endif 2418 } 2419 2420 freeit: 2421 m_freem(m); 2422 return; 2423 2424 bad: 2425 icmp6stat.icp6s_badredirect++; 2426 m_freem(m); 2427} 2428 2429void 2430icmp6_redirect_output(m0, rt) 2431 struct mbuf *m0; 2432 struct rtentry *rt; 2433{ 2434 struct ifnet *ifp; /* my outgoing interface */ 2435 struct in6_addr *ifp_ll6; 2436 struct in6_addr *router_ll6; 2437 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */ 2438 struct mbuf *m = NULL; /* newly allocated one */ 2439 struct ip6_hdr *ip6; /* m as struct ip6_hdr */ 2440 struct nd_redirect *nd_rd; 2441 size_t maxlen; 2442 u_char *p; 2443 struct ifnet *outif = NULL; 2444 struct sockaddr_in6 src_sa; 2445 2446 icmp6_errcount(&icmp6stat.icp6s_outerrhist, ND_REDIRECT, 0); 2447 2448 /* if we are not router, we don't send icmp6 redirect */ 2449 if (!ip6_forwarding || ip6_accept_rtadv) 2450 goto fail; 2451 2452 /* sanity check */ 2453 if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp)) 2454 goto fail; 2455 2456 /* 2457 * Address check: 2458 * the source address must identify a neighbor, and 2459 * the destination address must not be a multicast address 2460 * [RFC 2461, sec 8.2] 2461 */ 2462 sip6 = mtod(m0, struct ip6_hdr *); 2463 bzero(&src_sa, sizeof(src_sa)); 2464 src_sa.sin6_family = AF_INET6; 2465 src_sa.sin6_len = sizeof(src_sa); 2466 src_sa.sin6_addr = sip6->ip6_src; 2467 /* we don't currently use sin6_scope_id, but eventually use it */ 2468 src_sa.sin6_scope_id = in6_addr2scopeid(ifp, &sip6->ip6_src); 2469 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0) 2470 goto fail; 2471 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst)) 2472 goto fail; /* what should we do here? */ 2473 2474 /* rate limit */ 2475 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0)) 2476 goto fail; 2477 2478 /* 2479 * Since we are going to append up to 1280 bytes (= IPV6_MMTU), 2480 * we almost always ask for an mbuf cluster for simplicity. 2481 * (MHLEN < IPV6_MMTU is almost always true) 2482 */ 2483#if IPV6_MMTU >= MCLBYTES 2484# error assumption failed about IPV6_MMTU and MCLBYTES 2485#endif 2486 MGETHDR(m, M_DONTWAIT, MT_HEADER); 2487 if (m && IPV6_MMTU >= MHLEN) 2488 MCLGET(m, M_DONTWAIT); 2489 if (!m) 2490 goto fail; 2491 m->m_len = 0; 2492 maxlen = M_TRAILINGSPACE(m); 2493 maxlen = min(IPV6_MMTU, maxlen); 2494 /* just for safety */ 2495 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) + 2496 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) { 2497 goto fail; 2498 } 2499 2500 { 2501 /* get ip6 linklocal address for ifp(my outgoing interface). */ 2502 struct in6_ifaddr *ia; 2503 if ((ia = in6ifa_ifpforlinklocal(ifp, 2504 IN6_IFF_NOTREADY| 2505 IN6_IFF_ANYCAST)) == NULL) 2506 goto fail; 2507 ifp_ll6 = &ia->ia_addr.sin6_addr; 2508 } 2509 2510 /* get ip6 linklocal address for the router. */ 2511 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) { 2512 struct sockaddr_in6 *sin6; 2513 sin6 = (struct sockaddr_in6 *)rt->rt_gateway; 2514 router_ll6 = &sin6->sin6_addr; 2515 if (!IN6_IS_ADDR_LINKLOCAL(router_ll6)) 2516 router_ll6 = (struct in6_addr *)NULL; 2517 } else 2518 router_ll6 = (struct in6_addr *)NULL; 2519 2520 /* ip6 */ 2521 ip6 = mtod(m, struct ip6_hdr *); 2522 ip6->ip6_flow = 0; 2523 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2524 ip6->ip6_vfc |= IPV6_VERSION; 2525 /* ip6->ip6_plen will be set later */ 2526 ip6->ip6_nxt = IPPROTO_ICMPV6; 2527 ip6->ip6_hlim = 255; 2528 /* ip6->ip6_src must be linklocal addr for my outgoing if. */ 2529 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr)); 2530 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr)); 2531 2532 /* ND Redirect */ 2533 nd_rd = (struct nd_redirect *)(ip6 + 1); 2534 nd_rd->nd_rd_type = ND_REDIRECT; 2535 nd_rd->nd_rd_code = 0; 2536 nd_rd->nd_rd_reserved = 0; 2537 if (rt->rt_flags & RTF_GATEWAY) { 2538 /* 2539 * nd_rd->nd_rd_target must be a link-local address in 2540 * better router cases. 2541 */ 2542 if (!router_ll6) 2543 goto fail; 2544 bcopy(router_ll6, &nd_rd->nd_rd_target, 2545 sizeof(nd_rd->nd_rd_target)); 2546 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2547 sizeof(nd_rd->nd_rd_dst)); 2548 } else { 2549 /* make sure redtgt == reddst */ 2550 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target, 2551 sizeof(nd_rd->nd_rd_target)); 2552 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2553 sizeof(nd_rd->nd_rd_dst)); 2554 } 2555 2556 p = (u_char *)(nd_rd + 1); 2557 2558 if (!router_ll6) 2559 goto nolladdropt; 2560 2561 { 2562 /* target lladdr option */ 2563 struct rtentry *rt_router = NULL; 2564 int len; 2565 struct sockaddr_dl *sdl; 2566 struct nd_opt_hdr *nd_opt; 2567 char *lladdr; 2568 2569 rt_router = nd6_lookup(router_ll6, 0, ifp); 2570 if (!rt_router) 2571 goto nolladdropt; 2572 len = sizeof(*nd_opt) + ifp->if_addrlen; 2573 len = (len + 7) & ~7; /*round by 8*/ 2574 /* safety check */ 2575 if (len + (p - (u_char *)ip6) > maxlen) 2576 goto nolladdropt; 2577 if (!(rt_router->rt_flags & RTF_GATEWAY) && 2578 (rt_router->rt_flags & RTF_LLINFO) && 2579 (rt_router->rt_gateway->sa_family == AF_LINK) && 2580 (sdl = (struct sockaddr_dl *)rt_router->rt_gateway) && 2581 sdl->sdl_alen) { 2582 nd_opt = (struct nd_opt_hdr *)p; 2583 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 2584 nd_opt->nd_opt_len = len >> 3; 2585 lladdr = (char *)(nd_opt + 1); 2586 bcopy(LLADDR(sdl), lladdr, ifp->if_addrlen); 2587 p += len; 2588 } 2589 } 2590nolladdropt:; 2591 2592 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2593 2594 /* just to be safe */ 2595 if (m0->m_flags & M_DECRYPTED) 2596 goto noredhdropt; 2597 if (p - (u_char *)ip6 > maxlen) 2598 goto noredhdropt; 2599 2600 { 2601 /* redirected header option */ 2602 int len; 2603 struct nd_opt_rd_hdr *nd_opt_rh; 2604 2605 /* 2606 * compute the maximum size for icmp6 redirect header option. 2607 * XXX room for auth header? 2608 */ 2609 len = maxlen - (p - (u_char *)ip6); 2610 len &= ~7; 2611 2612 /* This is just for simplicity. */ 2613 if (m0->m_pkthdr.len != m0->m_len) { 2614 if (m0->m_next) { 2615 m_freem(m0->m_next); 2616 m0->m_next = NULL; 2617 } 2618 m0->m_pkthdr.len = m0->m_len; 2619 } 2620 2621 /* 2622 * Redirected header option spec (RFC2461 4.6.3) talks nothing 2623 * about padding/truncate rule for the original IP packet. 2624 * From the discussion on IPv6imp in Feb 1999, the consensus was: 2625 * - "attach as much as possible" is the goal 2626 * - pad if not aligned (original size can be guessed by original 2627 * ip6 header) 2628 * Following code adds the padding if it is simple enough, 2629 * and truncates if not. 2630 */ 2631 if (m0->m_next || m0->m_pkthdr.len != m0->m_len) 2632 panic("assumption failed in %s:%d\n", __FILE__, __LINE__); 2633 2634 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) { 2635 /* not enough room, truncate */ 2636 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh); 2637 } else { 2638 /* enough room, pad or truncate */ 2639 size_t extra; 2640 2641 extra = m0->m_pkthdr.len % 8; 2642 if (extra) { 2643 /* pad if easy enough, truncate if not */ 2644 if (8 - extra <= M_TRAILINGSPACE(m0)) { 2645 /* pad */ 2646 m0->m_len += (8 - extra); 2647 m0->m_pkthdr.len += (8 - extra); 2648 } else { 2649 /* truncate */ 2650 m0->m_pkthdr.len -= extra; 2651 m0->m_len -= extra; 2652 } 2653 } 2654 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh); 2655 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh); 2656 } 2657 2658 nd_opt_rh = (struct nd_opt_rd_hdr *)p; 2659 bzero(nd_opt_rh, sizeof(*nd_opt_rh)); 2660 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER; 2661 nd_opt_rh->nd_opt_rh_len = len >> 3; 2662 p += sizeof(*nd_opt_rh); 2663 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2664 2665 /* connect m0 to m */ 2666 m->m_next = m0; 2667 m->m_pkthdr.len = m->m_len + m0->m_len; 2668 } 2669noredhdropt:; 2670 2671 if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_src)) 2672 sip6->ip6_src.s6_addr16[1] = 0; 2673 if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_dst)) 2674 sip6->ip6_dst.s6_addr16[1] = 0; 2675#if 0 2676 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src)) 2677 ip6->ip6_src.s6_addr16[1] = 0; 2678 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) 2679 ip6->ip6_dst.s6_addr16[1] = 0; 2680#endif 2681 if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_target)) 2682 nd_rd->nd_rd_target.s6_addr16[1] = 0; 2683 if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_dst)) 2684 nd_rd->nd_rd_dst.s6_addr16[1] = 0; 2685 2686 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 2687 2688 nd_rd->nd_rd_cksum = 0; 2689 nd_rd->nd_rd_cksum 2690 = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen)); 2691 2692 /* send the packet to outside... */ 2693#ifdef IPSEC 2694 /* Don't lookup socket */ 2695 (void)ipsec_setsocket(m, NULL); 2696#endif /*IPSEC*/ 2697 ip6_output(m, NULL, NULL, 0, NULL, &outif); 2698 if (outif) { 2699 icmp6_ifstat_inc(outif, ifs6_out_msg); 2700 icmp6_ifstat_inc(outif, ifs6_out_redirect); 2701 } 2702 icmp6stat.icp6s_outhist[ND_REDIRECT]++; 2703 2704 return; 2705 2706fail: 2707 if (m) 2708 m_freem(m); 2709 if (m0) 2710 m_freem(m0); 2711} 2712 2713/* 2714 * ICMPv6 socket option processing. 2715 */ 2716int 2717icmp6_ctloutput(op, so, level, optname, mp) 2718 int op; 2719 struct socket *so; 2720 int level, optname; 2721 struct mbuf **mp; 2722{ 2723 int error = 0; 2724 int optlen; 2725 struct in6pcb *in6p = sotoin6pcb(so); 2726 struct mbuf *m = *mp; 2727 2728 optlen = m ? m->m_len : 0; 2729 2730 if (level != IPPROTO_ICMPV6) { 2731 if (op == PRCO_SETOPT && m) 2732 (void)m_free(m); 2733 return EINVAL; 2734 } 2735 2736 switch (op) { 2737 case PRCO_SETOPT: 2738 switch (optname) { 2739 case ICMP6_FILTER: 2740 { 2741 struct icmp6_filter *p; 2742 2743 if (optlen != sizeof(*p)) { 2744 error = EMSGSIZE; 2745 break; 2746 } 2747 p = mtod(m, struct icmp6_filter *); 2748 if (!p || !in6p->in6p_icmp6filt) { 2749 error = EINVAL; 2750 break; 2751 } 2752 bcopy(p, in6p->in6p_icmp6filt, 2753 sizeof(struct icmp6_filter)); 2754 error = 0; 2755 break; 2756 } 2757 2758 default: 2759 error = ENOPROTOOPT; 2760 break; 2761 } 2762 if (m) 2763 (void)m_freem(m); 2764 break; 2765 2766 case PRCO_GETOPT: 2767 switch (optname) { 2768 case ICMP6_FILTER: 2769 { 2770 struct icmp6_filter *p; 2771 2772 if (!in6p->in6p_icmp6filt) { 2773 error = EINVAL; 2774 break; 2775 } 2776 *mp = m = m_get(M_WAIT, MT_SOOPTS); 2777 m->m_len = sizeof(struct icmp6_filter); 2778 p = mtod(m, struct icmp6_filter *); 2779 bcopy(in6p->in6p_icmp6filt, p, 2780 sizeof(struct icmp6_filter)); 2781 error = 0; 2782 break; 2783 } 2784 2785 default: 2786 error = ENOPROTOOPT; 2787 break; 2788 } 2789 break; 2790 } 2791 2792 return(error); 2793} 2794 2795/* 2796 * Perform rate limit check. 2797 * Returns 0 if it is okay to send the icmp6 packet. 2798 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate 2799 * limitation. 2800 * 2801 * XXX per-destination/type check necessary? 2802 */ 2803static int 2804icmp6_ratelimit(dst, type, code) 2805 const struct in6_addr *dst; /* not used at this moment */ 2806 const int type; /* not used at this moment */ 2807 const int code; /* not used at this moment */ 2808{ 2809 int ret; 2810 2811 ret = 0; /*okay to send*/ 2812 2813 /* PPS limit */ 2814 if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count, 2815 icmp6errppslim)) { 2816 /* The packet is subject to rate limit */ 2817 ret++; 2818 } 2819 2820 return ret; 2821} 2822 2823static struct rtentry * 2824icmp6_mtudisc_clone(dst) 2825 struct sockaddr *dst; 2826{ 2827 struct rtentry *rt; 2828 int error; 2829 2830 rt = rtalloc1(dst, 1); 2831 if (rt == 0) 2832 return NULL; 2833 2834 /* If we didn't get a host route, allocate one */ 2835 if ((rt->rt_flags & RTF_HOST) == 0) { 2836 struct rtentry *nrt; 2837 2838 error = rtrequest((int) RTM_ADD, dst, 2839 (struct sockaddr *) rt->rt_gateway, 2840 (struct sockaddr *) 0, 2841 RTF_GATEWAY | RTF_HOST | RTF_DYNAMIC, &nrt); 2842 if (error) { 2843 rtfree(rt); 2844 rtfree(nrt); 2845 return NULL; 2846 } 2847 nrt->rt_rmx = rt->rt_rmx; 2848 rtfree(rt); 2849 rt = nrt; 2850 } 2851 error = rt_timer_add(rt, icmp6_mtudisc_timeout, 2852 icmp6_mtudisc_timeout_q); 2853 if (error) { 2854 rtfree(rt); 2855 return NULL; 2856 } 2857 2858 return rt; /* caller need to call rtfree() */ 2859} 2860 2861static void 2862icmp6_mtudisc_timeout(rt, r) 2863 struct rtentry *rt; 2864 struct rttimer *r; 2865{ 2866 if (rt == NULL) 2867 panic("icmp6_mtudisc_timeout: bad route to timeout"); 2868 if ((rt->rt_flags & (RTF_DYNAMIC | RTF_HOST)) == 2869 (RTF_DYNAMIC | RTF_HOST)) { 2870 rtrequest((int) RTM_DELETE, (struct sockaddr *)rt_key(rt), 2871 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0); 2872 } else { 2873 if ((rt->rt_rmx.rmx_locks & RTV_MTU) == 0) { 2874 rt->rt_rmx.rmx_mtu = 0; 2875 } 2876 } 2877} 2878 2879static void 2880icmp6_redirect_timeout(rt, r) 2881 struct rtentry *rt; 2882 struct rttimer *r; 2883{ 2884 if (rt == NULL) 2885 panic("icmp6_redirect_timeout: bad route to timeout"); 2886 if ((rt->rt_flags & (RTF_GATEWAY | RTF_DYNAMIC | RTF_HOST)) == 2887 (RTF_GATEWAY | RTF_DYNAMIC | RTF_HOST)) { 2888 rtrequest((int) RTM_DELETE, (struct sockaddr *)rt_key(rt), 2889 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0); 2890 } 2891} 2892 2893#include <uvm/uvm_extern.h> 2894#include <sys/sysctl.h> 2895 2896int 2897icmp6_sysctl(name, namelen, oldp, oldlenp, newp, newlen) 2898 int *name; 2899 u_int namelen; 2900 void *oldp; 2901 size_t *oldlenp; 2902 void *newp; 2903 size_t newlen; 2904{ 2905 2906 /* All sysctl names at this level are terminal. */ 2907 if (namelen != 1) 2908 return ENOTDIR; 2909 2910 switch (name[0]) { 2911 2912 case ICMPV6CTL_REDIRACCEPT: 2913 return sysctl_int(oldp, oldlenp, newp, newlen, 2914 &icmp6_rediraccept); 2915 case ICMPV6CTL_REDIRTIMEOUT: 2916 return sysctl_int(oldp, oldlenp, newp, newlen, 2917 &icmp6_redirtimeout); 2918 case ICMPV6CTL_STATS: 2919 return sysctl_rdstruct(oldp, oldlenp, newp, 2920 &icmp6stat, sizeof(icmp6stat)); 2921 case ICMPV6CTL_ND6_PRUNE: 2922 return sysctl_int(oldp, oldlenp, newp, newlen, &nd6_prune); 2923 case ICMPV6CTL_ND6_DELAY: 2924 return sysctl_int(oldp, oldlenp, newp, newlen, &nd6_delay); 2925 case ICMPV6CTL_ND6_UMAXTRIES: 2926 return sysctl_int(oldp, oldlenp, newp, newlen, &nd6_umaxtries); 2927 case ICMPV6CTL_ND6_MMAXTRIES: 2928 return sysctl_int(oldp, oldlenp, newp, newlen, &nd6_mmaxtries); 2929 case ICMPV6CTL_ND6_USELOOPBACK: 2930 return sysctl_int(oldp, oldlenp, newp, newlen, 2931 &nd6_useloopback); 2932 case ICMPV6CTL_NODEINFO: 2933 return sysctl_int(oldp, oldlenp, newp, newlen, &icmp6_nodeinfo); 2934 case ICMPV6CTL_ERRPPSLIMIT: 2935 return sysctl_int(oldp, oldlenp, newp, newlen, &icmp6errppslim); 2936 case ICMPV6CTL_ND6_MAXNUDHINT: 2937 return sysctl_int(oldp, oldlenp, newp, newlen, 2938 &nd6_maxnudhint); 2939 case ICMPV6CTL_MTUDISC_HIWAT: 2940 return sysctl_int(oldp, oldlenp, newp, newlen, 2941 &icmp6_mtudisc_hiwat); 2942 case ICMPV6CTL_MTUDISC_LOWAT: 2943 return sysctl_int(oldp, oldlenp, newp, newlen, 2944 &icmp6_mtudisc_lowat); 2945 case ICMPV6CTL_ND6_DEBUG: 2946 return sysctl_int(oldp, oldlenp, newp, newlen, &nd6_debug); 2947 default: 2948 return ENOPROTOOPT; 2949 } 2950 /* NOTREACHED */ 2951} 2952