icmp6.c revision 1.50
1/* $NetBSD: icmp6.c,v 1.50 2001/01/08 06:12:46 itojun Exp $ */ 2/* $KAME: icmp6.c,v 1.172 2000/12/11 19:27:06 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? */ 134int icmp6_mtudisc_hiwat = 1280; 135int icmp6_mtudisc_lowat = 256; 136 137static void icmp6_errcount __P((struct icmp6errstat *, int, int)); 138static int icmp6_rip6_input __P((struct mbuf **, int)); 139static int icmp6_ratelimit __P((const struct in6_addr *, const int, const int)); 140static const char *icmp6_redirect_diag __P((struct in6_addr *, 141 struct in6_addr *, struct in6_addr *)); 142static struct mbuf *ni6_input __P((struct mbuf *, int)); 143static struct mbuf *ni6_nametodns __P((const char *, int, int)); 144static int ni6_dnsmatch __P((const char *, int, const char *, int)); 145static int ni6_addrs __P((struct icmp6_nodeinfo *, struct mbuf *, 146 struct ifnet **, char *)); 147static int ni6_store_addrs __P((struct icmp6_nodeinfo *, struct icmp6_nodeinfo *, 148 struct ifnet *, int)); 149static struct rtentry *icmp6_mtudisc_clone __P((struct sockaddr *)); 150static void icmp6_mtudisc_timeout __P((struct rtentry *, struct rttimer *)); 151 152#ifdef COMPAT_RFC1885 153static struct route_in6 icmp6_reflect_rt; 154#endif 155 156void 157icmp6_init() 158{ 159 mld6_init(); 160 icmp6_mtudisc_timeout_q = rt_timer_queue_create(pmtu_expire); 161} 162 163static void 164icmp6_errcount(stat, type, code) 165 struct icmp6errstat *stat; 166 int type, code; 167{ 168 switch(type) { 169 case ICMP6_DST_UNREACH: 170 switch (code) { 171 case ICMP6_DST_UNREACH_NOROUTE: 172 stat->icp6errs_dst_unreach_noroute++; 173 return; 174 case ICMP6_DST_UNREACH_ADMIN: 175 stat->icp6errs_dst_unreach_admin++; 176 return; 177 case ICMP6_DST_UNREACH_BEYONDSCOPE: 178 stat->icp6errs_dst_unreach_beyondscope++; 179 return; 180 case ICMP6_DST_UNREACH_ADDR: 181 stat->icp6errs_dst_unreach_addr++; 182 return; 183 case ICMP6_DST_UNREACH_NOPORT: 184 stat->icp6errs_dst_unreach_noport++; 185 return; 186 } 187 break; 188 case ICMP6_PACKET_TOO_BIG: 189 stat->icp6errs_packet_too_big++; 190 return; 191 case ICMP6_TIME_EXCEEDED: 192 switch(code) { 193 case ICMP6_TIME_EXCEED_TRANSIT: 194 stat->icp6errs_time_exceed_transit++; 195 return; 196 case ICMP6_TIME_EXCEED_REASSEMBLY: 197 stat->icp6errs_time_exceed_reassembly++; 198 return; 199 } 200 break; 201 case ICMP6_PARAM_PROB: 202 switch(code) { 203 case ICMP6_PARAMPROB_HEADER: 204 stat->icp6errs_paramprob_header++; 205 return; 206 case ICMP6_PARAMPROB_NEXTHEADER: 207 stat->icp6errs_paramprob_nextheader++; 208 return; 209 case ICMP6_PARAMPROB_OPTION: 210 stat->icp6errs_paramprob_option++; 211 return; 212 } 213 break; 214 case ND_REDIRECT: 215 stat->icp6errs_redirect++; 216 return; 217 } 218 stat->icp6errs_unknown++; 219} 220 221/* 222 * Register a Path MTU Discovery callback. 223 */ 224void 225icmp6_mtudisc_callback_register(func) 226 void (*func) __P((struct in6_addr *)); 227{ 228 struct icmp6_mtudisc_callback *mc; 229 230 for (mc = LIST_FIRST(&icmp6_mtudisc_callbacks); mc != NULL; 231 mc = LIST_NEXT(mc, mc_list)) { 232 if (mc->mc_func == func) 233 return; 234 } 235 236 mc = malloc(sizeof(*mc), M_PCB, M_NOWAIT); 237 if (mc == NULL) 238 panic("icmp6_mtudisc_callback_register"); 239 240 mc->mc_func = func; 241 LIST_INSERT_HEAD(&icmp6_mtudisc_callbacks, mc, mc_list); 242} 243 244/* 245 * Generate an error packet of type error in response to bad IP6 packet. 246 */ 247void 248icmp6_error(m, type, code, param) 249 struct mbuf *m; 250 int type, code, param; 251{ 252 struct ip6_hdr *oip6, *nip6; 253 struct icmp6_hdr *icmp6; 254 u_int preplen; 255 int off; 256 int nxt; 257 258 icmp6stat.icp6s_error++; 259 260 /* count per-type-code statistics */ 261 icmp6_errcount(&icmp6stat.icp6s_outerrhist, type, code); 262 263 if (m->m_flags & M_DECRYPTED) { 264 icmp6stat.icp6s_canterror++; 265 goto freeit; 266 } 267 268#ifndef PULLDOWN_TEST 269 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), ); 270#else 271 if (m->m_len < sizeof(struct ip6_hdr)) { 272 m = m_pullup(m, sizeof(struct ip6_hdr)); 273 if (m == NULL) 274 return; 275 } 276#endif 277 oip6 = mtod(m, struct ip6_hdr *); 278 279 /* 280 * Multicast destination check. For unrecognized option errors, 281 * this check has already done in ip6_unknown_opt(), so we can 282 * check only for other errors. 283 */ 284 if ((m->m_flags & (M_BCAST|M_MCAST) || 285 IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) && 286 (type != ICMP6_PACKET_TOO_BIG && 287 (type != ICMP6_PARAM_PROB || 288 code != ICMP6_PARAMPROB_OPTION))) 289 goto freeit; 290 291 /* Source address check. XXX: the case of anycast source? */ 292 if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) || 293 IN6_IS_ADDR_MULTICAST(&oip6->ip6_src)) 294 goto freeit; 295 296 /* 297 * If we are about to send ICMPv6 against ICMPv6 error/redirect, 298 * don't do it. 299 */ 300 nxt = -1; 301 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 302 if (off >= 0 && nxt == IPPROTO_ICMPV6) { 303 struct icmp6_hdr *icp; 304 305#ifndef PULLDOWN_TEST 306 IP6_EXTHDR_CHECK(m, 0, off + sizeof(struct icmp6_hdr), ); 307 icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 308#else 309 IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off, 310 sizeof(*icp)); 311 if (icp == NULL) { 312 icmp6stat.icp6s_tooshort++; 313 return; 314 } 315#endif 316 if (icp->icmp6_type < ICMP6_ECHO_REQUEST || 317 icp->icmp6_type == ND_REDIRECT) { 318 /* 319 * ICMPv6 error 320 * Special case: for redirect (which is 321 * informational) we must not send icmp6 error. 322 */ 323 icmp6stat.icp6s_canterror++; 324 goto freeit; 325 } else { 326 /* ICMPv6 informational - send the error */ 327 } 328 } else { 329 /* non-ICMPv6 - send the error */ 330 } 331 332 oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */ 333 334 /* Finally, do rate limitation check. */ 335 if (icmp6_ratelimit(&oip6->ip6_src, type, code)) { 336 icmp6stat.icp6s_toofreq++; 337 goto freeit; 338 } 339 340 /* 341 * OK, ICMP6 can be generated. 342 */ 343 344 if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN) 345 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len); 346 347 preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 348 M_PREPEND(m, preplen, M_DONTWAIT); 349 if (m && m->m_len < preplen) 350 m = m_pullup(m, preplen); 351 if (m == NULL) { 352 printf("ENOBUFS in icmp6_error %d\n", __LINE__); 353 return; 354 } 355 356 nip6 = mtod(m, struct ip6_hdr *); 357 nip6->ip6_src = oip6->ip6_src; 358 nip6->ip6_dst = oip6->ip6_dst; 359 360 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_src)) 361 oip6->ip6_src.s6_addr16[1] = 0; 362 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_dst)) 363 oip6->ip6_dst.s6_addr16[1] = 0; 364 365 icmp6 = (struct icmp6_hdr *)(nip6 + 1); 366 icmp6->icmp6_type = type; 367 icmp6->icmp6_code = code; 368 icmp6->icmp6_pptr = htonl((u_int32_t)param); 369 370 icmp6stat.icp6s_outhist[type]++; 371 icmp6_reflect(m, sizeof(struct ip6_hdr)); /*header order: IPv6 - ICMPv6*/ 372 373 return; 374 375 freeit: 376 /* 377 * If we can't tell wheter or not we can generate ICMP6, free it. 378 */ 379 m_freem(m); 380} 381 382/* 383 * Process a received ICMP6 message. 384 */ 385int 386icmp6_input(mp, offp, proto) 387 struct mbuf **mp; 388 int *offp, proto; 389{ 390 struct mbuf *m = *mp, *n; 391 struct ip6_hdr *ip6, *nip6; 392 struct icmp6_hdr *icmp6, *nicmp6; 393 int off = *offp; 394 int icmp6len = m->m_pkthdr.len - *offp; 395 int code, sum, noff; 396 struct sockaddr_in6 icmp6src; 397 398#ifndef PULLDOWN_TEST 399 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr), IPPROTO_DONE); 400 /* m might change if M_LOOP. So, call mtod after this */ 401#endif 402 403 /* 404 * Locate icmp6 structure in mbuf, and check 405 * that not corrupted and of at least minimum length 406 */ 407 408 ip6 = mtod(m, struct ip6_hdr *); 409 if (icmp6len < sizeof(struct icmp6_hdr)) { 410 icmp6stat.icp6s_tooshort++; 411 goto freeit; 412 } 413 414 /* 415 * calculate the checksum 416 */ 417#ifndef PULLDOWN_TEST 418 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off); 419#else 420 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 421 if (icmp6 == NULL) { 422 icmp6stat.icp6s_tooshort++; 423 return IPPROTO_DONE; 424 } 425#endif 426 code = icmp6->icmp6_code; 427 428 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) { 429#ifdef ND6DEBUG 430 log(LOG_ERR, 431 "ICMP6 checksum error(%d|%x) %s\n", 432 icmp6->icmp6_type, sum, ip6_sprintf(&ip6->ip6_src)); 433#endif 434 icmp6stat.icp6s_checksum++; 435 goto freeit; 436 } 437 438#if defined(NFAITH) && 0 < NFAITH 439 if (m->m_pkthdr.rcvif && m->m_pkthdr.rcvif->if_type == IFT_FAITH) { 440 /* 441 * Deliver very specific ICMP6 type only. 442 * This is important to deilver TOOBIG. Otherwise PMTUD 443 * will not work. 444 */ 445 switch (icmp6->icmp6_type) { 446 case ICMP6_DST_UNREACH: 447 case ICMP6_PACKET_TOO_BIG: 448 case ICMP6_TIME_EXCEEDED: 449 break; 450 default: 451 goto freeit; 452 } 453 } 454#endif 455 456#ifdef IPSEC 457 /* drop it if it does not match the default policy */ 458 if (ipsec6_in_reject(m, NULL)) { 459 ipsec6stat.in_polvio++; 460 goto freeit; 461 } 462#endif 463 464 icmp6stat.icp6s_inhist[icmp6->icmp6_type]++; 465 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_msg); 466 if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK) 467 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error); 468 469 switch (icmp6->icmp6_type) { 470 471 case ICMP6_DST_UNREACH: 472 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_dstunreach); 473 switch (code) { 474 case ICMP6_DST_UNREACH_NOROUTE: 475 code = PRC_UNREACH_NET; 476 break; 477 case ICMP6_DST_UNREACH_ADMIN: 478 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_adminprohib); 479 code = PRC_UNREACH_PROTOCOL; /* is this a good code? */ 480 break; 481 case ICMP6_DST_UNREACH_ADDR: 482 code = PRC_HOSTDEAD; 483 break; 484#ifdef COMPAT_RFC1885 485 case ICMP6_DST_UNREACH_NOTNEIGHBOR: 486 code = PRC_UNREACH_SRCFAIL; 487 break; 488#else 489 case ICMP6_DST_UNREACH_BEYONDSCOPE: 490 /* I mean "source address was incorrect." */ 491 code = PRC_PARAMPROB; 492 break; 493#endif 494 case ICMP6_DST_UNREACH_NOPORT: 495 code = PRC_UNREACH_PORT; 496 break; 497 default: 498 goto badcode; 499 } 500 goto deliver; 501 break; 502 503 case ICMP6_PACKET_TOO_BIG: 504 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_pkttoobig); 505 if (code != 0) 506 goto badcode; 507 508 code = PRC_MSGSIZE; 509 510 /* 511 * Updating the path MTU will be done after examining 512 * intermediate extension headers. 513 */ 514 goto deliver; 515 break; 516 517 case ICMP6_TIME_EXCEEDED: 518 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_timeexceed); 519 switch (code) { 520 case ICMP6_TIME_EXCEED_TRANSIT: 521 case ICMP6_TIME_EXCEED_REASSEMBLY: 522 code += PRC_TIMXCEED_INTRANS; 523 break; 524 default: 525 goto badcode; 526 } 527 goto deliver; 528 break; 529 530 case ICMP6_PARAM_PROB: 531 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_paramprob); 532 switch (code) { 533 case ICMP6_PARAMPROB_NEXTHEADER: 534 code = PRC_UNREACH_PROTOCOL; 535 break; 536 case ICMP6_PARAMPROB_HEADER: 537 case ICMP6_PARAMPROB_OPTION: 538 code = PRC_PARAMPROB; 539 break; 540 default: 541 goto badcode; 542 } 543 goto deliver; 544 break; 545 546 case ICMP6_ECHO_REQUEST: 547 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echo); 548 if (code != 0) 549 goto badcode; 550 if ((n = m_copy(m, 0, M_COPYALL)) == NULL) { 551 /* Give up remote */ 552 break; 553 } 554 if ((n->m_flags & M_EXT) != 0 555 || n->m_len < off + sizeof(struct icmp6_hdr)) { 556 struct mbuf *n0 = n; 557 const int maxlen = sizeof(*nip6) + sizeof(*nicmp6); 558 559 /* 560 * Prepare an internal mbuf. m_pullup() doesn't 561 * always copy the length we specified. 562 */ 563 if (maxlen >= MCLBYTES) { 564#ifdef DIAGNOSTIC 565 printf("MCLBYTES too small\n"); 566#endif 567 /* Give up remote */ 568 m_freem(n0); 569 break; 570 } 571 MGETHDR(n, M_DONTWAIT, n0->m_type); 572 if (n && maxlen >= MHLEN) { 573 MCLGET(n, M_DONTWAIT); 574 if ((n->m_flags & M_EXT) == 0) { 575 m_free(n); 576 n = NULL; 577 } 578 } 579 if (n == NULL) { 580 /* Give up remote */ 581 m_freem(n0); 582 break; 583 } 584 M_COPY_PKTHDR(n, n0); 585 /* 586 * Copy IPv6 and ICMPv6 only. 587 */ 588 nip6 = mtod(n, struct ip6_hdr *); 589 bcopy(ip6, nip6, sizeof(struct ip6_hdr)); 590 nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 591 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); 592 noff = sizeof(struct ip6_hdr); 593 n->m_pkthdr.len = n->m_len = 594 noff + sizeof(struct icmp6_hdr); 595 /* 596 * Adjust mbuf. ip6_plen will be adjusted in 597 * ip6_output(). 598 */ 599 m_adj(n0, off + sizeof(struct icmp6_hdr)); 600 n->m_pkthdr.len += n0->m_pkthdr.len; 601 n->m_next = n0; 602 n0->m_flags &= ~M_PKTHDR; 603 } else { 604 nip6 = mtod(n, struct ip6_hdr *); 605 nicmp6 = (struct icmp6_hdr *)((caddr_t)nip6 + off); 606 noff = off; 607 } 608 nicmp6->icmp6_type = ICMP6_ECHO_REPLY; 609 nicmp6->icmp6_code = 0; 610 if (n) { 611 icmp6stat.icp6s_reflect++; 612 icmp6stat.icp6s_outhist[ICMP6_ECHO_REPLY]++; 613 icmp6_reflect(n, noff); 614 } 615 break; 616 617 case ICMP6_ECHO_REPLY: 618 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echoreply); 619 if (code != 0) 620 goto badcode; 621 break; 622 623 case MLD6_LISTENER_QUERY: 624 case MLD6_LISTENER_REPORT: 625 if (icmp6len < sizeof(struct mld6_hdr)) 626 goto badlen; 627 if (icmp6->icmp6_type == MLD6_LISTENER_QUERY) /* XXX: ugly... */ 628 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldquery); 629 else 630 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldreport); 631 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 632 /* give up local */ 633 mld6_input(m, off); 634 m = NULL; 635 goto freeit; 636 } 637 mld6_input(n, off); 638 /* m stays. */ 639 break; 640 641 case MLD6_LISTENER_DONE: 642 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mlddone); 643 if (icmp6len < sizeof(struct mld6_hdr)) /* necessary? */ 644 goto badlen; 645 break; /* nothing to be done in kernel */ 646 647 case MLD6_MTRACE_RESP: 648 case MLD6_MTRACE: 649 /* XXX: these two are experimental. not officially defind. */ 650 /* XXX: per-interface statistics? */ 651 break; /* just pass it to applications */ 652 653 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */ 654 { 655 enum { WRU, FQDN } mode; 656 657 if (!icmp6_nodeinfo) 658 break; 659 660 if (icmp6len == sizeof(struct icmp6_hdr) + 4) 661 mode = WRU; 662 else if (icmp6len >= sizeof(struct icmp6_nodeinfo)) 663 mode = FQDN; 664 else 665 goto badlen; 666 667 if (mode == FQDN) { 668#ifndef PULLDOWN_TEST 669 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo), 670 IPPROTO_DONE); 671#endif 672 n = m_copy(m, 0, M_COPYALL); 673 if (n) 674 n = ni6_input(n, off); 675 /* XXX meaningless if n == NULL */ 676 noff = sizeof(struct ip6_hdr); 677 } else { 678 u_char *p; 679 int maxlen, maxhlen; 680 681 if (code != 0) 682 goto badcode; 683 maxlen = sizeof(*nip6) + sizeof(*nicmp6) + 4; 684 if (maxlen >= MCLBYTES) { 685#ifdef DIAGNOSTIC 686 printf("MCLBYTES too small\n"); 687#endif 688 /* Give up remote */ 689 break; 690 } 691 MGETHDR(n, M_DONTWAIT, m->m_type); 692 if (n && maxlen > MHLEN) { 693 MCLGET(n, M_DONTWAIT); 694 if ((n->m_flags & M_EXT) == 0) { 695 m_free(n); 696 n = NULL; 697 } 698 } 699 if (n == NULL) { 700 /* Give up remote */ 701 break; 702 } 703 n->m_len = 0; 704 maxhlen = M_TRAILINGSPACE(n) - maxlen; 705 if (maxhlen > hostnamelen) 706 maxhlen = hostnamelen; 707 /* 708 * Copy IPv6 and ICMPv6 only. 709 */ 710 nip6 = mtod(n, struct ip6_hdr *); 711 bcopy(ip6, nip6, sizeof(struct ip6_hdr)); 712 nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 713 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); 714 p = (u_char *)(nicmp6 + 1); 715 bzero(p, 4); 716 bcopy(hostname, p + 4, maxhlen); /*meaningless TTL*/ 717 noff = sizeof(struct ip6_hdr); 718 M_COPY_PKTHDR(n, m); /* just for recvif */ 719 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 720 sizeof(struct icmp6_hdr) + 4 + maxhlen; 721 nicmp6->icmp6_type = ICMP6_WRUREPLY; 722 nicmp6->icmp6_code = 0; 723 } 724#undef hostnamelen 725 if (n) { 726 icmp6stat.icp6s_reflect++; 727 icmp6stat.icp6s_outhist[ICMP6_WRUREPLY]++; 728 icmp6_reflect(n, noff); 729 } 730 break; 731 } 732 733 case ICMP6_WRUREPLY: 734 if (code != 0) 735 goto badcode; 736 break; 737 738 case ND_ROUTER_SOLICIT: 739 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routersolicit); 740 if (code != 0) 741 goto badcode; 742 if (icmp6len < sizeof(struct nd_router_solicit)) 743 goto badlen; 744 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 745 /* give up local */ 746 nd6_rs_input(m, off, icmp6len); 747 m = NULL; 748 goto freeit; 749 } 750 nd6_rs_input(n, off, icmp6len); 751 /* m stays. */ 752 break; 753 754 case ND_ROUTER_ADVERT: 755 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routeradvert); 756 if (code != 0) 757 goto badcode; 758 if (icmp6len < sizeof(struct nd_router_advert)) 759 goto badlen; 760 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 761 /* give up local */ 762 nd6_ra_input(m, off, icmp6len); 763 m = NULL; 764 goto freeit; 765 } 766 nd6_ra_input(n, off, icmp6len); 767 /* m stays. */ 768 break; 769 770 case ND_NEIGHBOR_SOLICIT: 771 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighborsolicit); 772 if (code != 0) 773 goto badcode; 774 if (icmp6len < sizeof(struct nd_neighbor_solicit)) 775 goto badlen; 776 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 777 /* give up local */ 778 nd6_ns_input(m, off, icmp6len); 779 m = NULL; 780 goto freeit; 781 } 782 nd6_ns_input(n, off, icmp6len); 783 /* m stays. */ 784 break; 785 786 case ND_NEIGHBOR_ADVERT: 787 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighboradvert); 788 if (code != 0) 789 goto badcode; 790 if (icmp6len < sizeof(struct nd_neighbor_advert)) 791 goto badlen; 792 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 793 /* give up local */ 794 nd6_na_input(m, off, icmp6len); 795 m = NULL; 796 goto freeit; 797 } 798 nd6_na_input(n, off, icmp6len); 799 /* m stays. */ 800 break; 801 802 case ND_REDIRECT: 803 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_redirect); 804 if (code != 0) 805 goto badcode; 806 if (icmp6len < sizeof(struct nd_redirect)) 807 goto badlen; 808 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 809 /* give up local */ 810 icmp6_redirect_input(m, off); 811 m = NULL; 812 goto freeit; 813 } 814 icmp6_redirect_input(n, off); 815 /* m stays. */ 816 break; 817 818 case ICMP6_ROUTER_RENUMBERING: 819 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND && 820 code != ICMP6_ROUTER_RENUMBERING_RESULT) 821 goto badcode; 822 if (icmp6len < sizeof(struct icmp6_router_renum)) 823 goto badlen; 824 break; 825 826 default: 827 printf("icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n", 828 icmp6->icmp6_type, ip6_sprintf(&ip6->ip6_src), 829 ip6_sprintf(&ip6->ip6_dst), 830 m->m_pkthdr.rcvif ? m->m_pkthdr.rcvif->if_index : 0); 831 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) { 832 /* ICMPv6 error: MUST deliver it by spec... */ 833 code = PRC_NCMDS; 834 /* deliver */ 835 } else { 836 /* ICMPv6 informational: MUST not deliver */ 837 break; 838 } 839 deliver: 840 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) { 841 icmp6stat.icp6s_tooshort++; 842 goto freeit; 843 } 844#ifndef PULLDOWN_TEST 845 IP6_EXTHDR_CHECK(m, off, 846 sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr), 847 IPPROTO_DONE); 848 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 849#else 850 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 851 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 852 if (icmp6 == NULL) { 853 icmp6stat.icp6s_tooshort++; 854 return IPPROTO_DONE; 855 } 856#endif 857 bzero(&icmp6src, sizeof(icmp6src)); 858 icmp6src.sin6_len = sizeof(struct sockaddr_in6); 859 icmp6src.sin6_family = AF_INET6; 860 icmp6src.sin6_addr = ((struct ip6_hdr *)(icmp6 + 1))->ip6_dst; 861 862 /* Detect the upper level protocol */ 863 { 864 void (*ctlfunc) __P((int, struct sockaddr *, void *)); 865 struct ip6_hdr *eip6 = (struct ip6_hdr *)(icmp6 + 1); 866 u_int8_t nxt = eip6->ip6_nxt; 867 int eoff = off + sizeof(struct icmp6_hdr) + 868 sizeof(struct ip6_hdr); 869 struct ip6ctlparam ip6cp; 870 struct in6_addr *finaldst = NULL; 871 struct ip6_frag *fh; 872 struct ip6_rthdr *rth; 873 struct ip6_rthdr0 *rth0; 874 int rthlen; 875 876 while (1) { /* XXX: should avoid inf. loop explicitly? */ 877 struct ip6_ext *eh; 878 879 switch(nxt) { 880 case IPPROTO_HOPOPTS: 881 case IPPROTO_DSTOPTS: 882 case IPPROTO_AH: 883#ifndef PULLDOWN_TEST 884 IP6_EXTHDR_CHECK(m, 0, eoff + 885 sizeof(struct ip6_ext), 886 IPPROTO_DONE); 887 eh = (struct ip6_ext *)(mtod(m, caddr_t) 888 + eoff); 889#else 890 IP6_EXTHDR_GET(eh, struct ip6_ext *, m, 891 eoff, sizeof(*eh)); 892 if (eh == NULL) { 893 icmp6stat.icp6s_tooshort++; 894 return IPPROTO_DONE; 895 } 896#endif 897 898 if (nxt == IPPROTO_AH) 899 eoff += (eh->ip6e_len + 2) << 2; 900 else 901 eoff += (eh->ip6e_len + 1) << 3; 902 nxt = eh->ip6e_nxt; 903 break; 904 case IPPROTO_ROUTING: 905 /* 906 * When the erroneous packet contains a 907 * routing header, we should examine the 908 * header to determine the final destination. 909 * Otherwise, we can't properly update 910 * information that depends on the final 911 * destination (e.g. path MTU). 912 */ 913#ifndef PULLDOWN_TEST 914 IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(*rth), 915 IPPROTO_DONE); 916 rth = (struct ip6_rthdr *)(mtod(m, caddr_t) 917 + eoff); 918#else 919 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m, 920 eoff, sizeof(*rth)); 921 if (rth == NULL) { 922 icmp6stat.icp6s_tooshort++; 923 return IPPROTO_DONE; 924 } 925#endif 926 rthlen = (rth->ip6r_len + 1) << 3; 927 /* 928 * XXX: currently there is no 929 * officially defined type other 930 * than type-0. 931 * Note that if the segment left field 932 * is 0, all intermediate hops must 933 * have been passed. 934 */ 935 if (rth->ip6r_segleft && 936 rth->ip6r_type == IPV6_RTHDR_TYPE_0) { 937 int hops; 938 939#ifndef PULLDOWN_TEST 940 IP6_EXTHDR_CHECK(m, 0, eoff + rthlen, 941 IPPROTO_DONE); 942 rth0 = (struct ip6_rthdr0 *)(mtod(m, caddr_t) + eoff); 943#else 944 IP6_EXTHDR_GET(rth0, 945 struct ip6_rthdr0 *, m, 946 eoff, rthlen); 947 if (rth0 == NULL) { 948 icmp6stat.icp6s_tooshort++; 949 return IPPROTO_DONE; 950 } 951#endif 952 /* just ignore a bogus header */ 953 if ((rth0->ip6r0_len % 2) == 0 && 954 (hops = rth0->ip6r0_len/2)) 955 finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1); 956 } 957 eoff += rthlen; 958 nxt = rth->ip6r_nxt; 959 break; 960 case IPPROTO_FRAGMENT: 961#ifndef PULLDOWN_TEST 962 IP6_EXTHDR_CHECK(m, 0, eoff + 963 sizeof(struct ip6_frag), 964 IPPROTO_DONE); 965 fh = (struct ip6_frag *)(mtod(m, caddr_t) 966 + eoff); 967#else 968 IP6_EXTHDR_GET(fh, struct ip6_frag *, m, 969 eoff, sizeof(*fh)); 970 if (fh == NULL) { 971 icmp6stat.icp6s_tooshort++; 972 return IPPROTO_DONE; 973 } 974#endif 975 /* 976 * Data after a fragment header is meaningless 977 * unless it is the first fragment, but 978 * we'll go to the notify label for path MTU 979 * discovery. 980 */ 981 if (fh->ip6f_offlg & IP6F_OFF_MASK) 982 goto notify; 983 984 eoff += sizeof(struct ip6_frag); 985 nxt = fh->ip6f_nxt; 986 break; 987 default: 988 /* 989 * This case includes ESP and the No Next 990 * Header. In such cases going to the notify 991 * label does not have any meaning 992 * (i.e. ctlfunc will be NULL), but we go 993 * anyway since we might have to update 994 * path MTU information. 995 */ 996 goto notify; 997 } 998 } 999 notify: 1000#ifndef PULLDOWN_TEST 1001 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 1002#else 1003 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 1004 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 1005 if (icmp6 == NULL) { 1006 icmp6stat.icp6s_tooshort++; 1007 return IPPROTO_DONE; 1008 } 1009#endif 1010 if (finaldst == NULL) 1011 finaldst = &((struct ip6_hdr *)(icmp6 + 1))->ip6_dst; 1012 ip6cp.ip6c_m = m; 1013 ip6cp.ip6c_icmp6 = icmp6; 1014 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1); 1015 ip6cp.ip6c_off = eoff; 1016 ip6cp.ip6c_finaldst = finaldst; 1017 1018 ctlfunc = (void (*) __P((int, struct sockaddr *, void *))) 1019 (inet6sw[ip6_protox[nxt]].pr_ctlinput); 1020 if (ctlfunc) { 1021 (void) (*ctlfunc)(code, (struct sockaddr *)&icmp6src, 1022 &ip6cp); 1023 } 1024 } 1025 break; 1026 1027 badcode: 1028 icmp6stat.icp6s_badcode++; 1029 break; 1030 1031 badlen: 1032 icmp6stat.icp6s_badlen++; 1033 break; 1034 } 1035 1036 icmp6_rip6_input(&m, *offp); 1037 return IPPROTO_DONE; 1038 1039 freeit: 1040 m_freem(m); 1041 return IPPROTO_DONE; 1042} 1043 1044void 1045icmp6_mtudisc_update(ip6cp, validated) 1046 struct ip6ctlparam *ip6cp; 1047 int validated; 1048{ 1049 unsigned long rtcount; 1050 struct icmp6_mtudisc_callback *mc; 1051 struct in6_addr *dst = ip6cp->ip6c_finaldst; 1052 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6; 1053 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */ 1054 u_int mtu = ntohl(icmp6->icmp6_mtu); 1055 struct rtentry *rt = NULL; 1056 struct sockaddr_in6 sin6; 1057 1058 /* 1059 * allow non-validated cases if memory is plenty, to make traffic 1060 * from non-connected pcb happy. 1061 */ 1062 rtcount = rt_timer_count(icmp6_mtudisc_timeout_q); 1063 if (validated) { 1064 if (rtcount > icmp6_mtudisc_hiwat) 1065 return; 1066 else if (rtcount > icmp6_mtudisc_lowat) { 1067 /* 1068 * XXX nuke a victim, install the new one. 1069 */ 1070 } 1071 } else { 1072 if (rtcount > icmp6_mtudisc_lowat) 1073 return; 1074 } 1075 1076 bzero(&sin6, sizeof(sin6)); 1077 sin6.sin6_family = PF_INET6; 1078 sin6.sin6_len = sizeof(struct sockaddr_in6); 1079 sin6.sin6_addr = *dst; 1080 /* XXX normally, this won't happen */ 1081 if (IN6_IS_ADDR_LINKLOCAL(dst)) { 1082 sin6.sin6_addr.s6_addr16[1] = 1083 htons(m->m_pkthdr.rcvif->if_index); 1084 } 1085 /* sin6.sin6_scope_id = XXX: should be set if DST is a scoped addr */ 1086 rt = icmp6_mtudisc_clone((struct sockaddr *)&sin6); 1087 1088 if (rt && (rt->rt_flags & RTF_HOST) 1089 && !(rt->rt_rmx.rmx_locks & RTV_MTU)) { 1090 if (mtu < IPV6_MMTU) { 1091 /* xxx */ 1092 rt->rt_rmx.rmx_locks |= RTV_MTU; 1093 } else if (mtu < rt->rt_ifp->if_mtu && 1094 rt->rt_rmx.rmx_mtu > mtu) { 1095 icmp6stat.icp6s_pmtuchg++; 1096 rt->rt_rmx.rmx_mtu = mtu; 1097 } 1098 } 1099 if (rt) 1100 RTFREE(rt); 1101 1102 /* 1103 * Notify protocols that the MTU for this destination 1104 * has changed. 1105 */ 1106 for (mc = LIST_FIRST(&icmp6_mtudisc_callbacks); mc != NULL; 1107 mc = LIST_NEXT(mc, mc_list)) 1108 (*mc->mc_func)(&sin6.sin6_addr); 1109} 1110 1111/* 1112 * Process a Node Information Query packet, based on 1113 * draft-ietf-ipngwg-icmp-name-lookups-07. 1114 * 1115 * Spec incompatibilities: 1116 * - IPv6 Subject address handling 1117 * - IPv4 Subject address handling support missing 1118 * - Proxy reply (answer even if it's not for me) 1119 * - joins NI group address at in6_ifattach() time only, does not cope 1120 * with hostname changes by sethostname(3) 1121 */ 1122#ifndef offsetof /* XXX */ 1123#define offsetof(type, member) ((size_t)(&((type *)0)->member)) 1124#endif 1125static struct mbuf * 1126ni6_input(m, off) 1127 struct mbuf *m; 1128 int off; 1129{ 1130 struct icmp6_nodeinfo *ni6, *nni6; 1131 struct mbuf *n = NULL; 1132 u_int16_t qtype; 1133 int subjlen; 1134 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1135 struct ni_reply_fqdn *fqdn; 1136 int addrs; /* for NI_QTYPE_NODEADDR */ 1137 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */ 1138 struct sockaddr_in6 sin6; /* double meaning; ip6_dst and subjectaddr */ 1139 struct ip6_hdr *ip6; 1140 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */ 1141 char *subj = NULL; 1142 1143 ip6 = mtod(m, struct ip6_hdr *); 1144#ifndef PULLDOWN_TEST 1145 ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off); 1146#else 1147 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6)); 1148 if (ni6 == NULL) { 1149 /* m is already reclaimed */ 1150 return NULL; 1151 } 1152#endif 1153 1154 /* 1155 * Validate IPv6 destination address. 1156 * 1157 * The Responder must discard the Query without further processing 1158 * unless it is one of the Responder's unicast or anycast addresses, or 1159 * a link-local scope multicast address which the Responder has joined. 1160 * [icmp-name-lookups-07, Section 4.] 1161 */ 1162 bzero(&sin6, sizeof(sin6)); 1163 sin6.sin6_family = AF_INET6; 1164 sin6.sin6_len = sizeof(struct sockaddr_in6); 1165 bcopy(&ip6->ip6_dst, &sin6.sin6_addr, sizeof(sin6.sin6_addr)); 1166 /* XXX scopeid */ 1167 if (ifa_ifwithaddr((struct sockaddr *)&sin6)) 1168 ; /* unicast/anycast, fine */ 1169 else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr)) 1170 ; /* link-local multicast, fine */ 1171 else 1172 goto bad; 1173 1174 /* validate query Subject field. */ 1175 qtype = ntohs(ni6->ni_qtype); 1176 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo); 1177 switch (qtype) { 1178 case NI_QTYPE_NOOP: 1179 case NI_QTYPE_SUPTYPES: 1180 /* 07 draft */ 1181 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0) 1182 break; 1183 /*FALLTHROUGH*/ 1184 case NI_QTYPE_FQDN: 1185 case NI_QTYPE_NODEADDR: 1186 switch (ni6->ni_code) { 1187 case ICMP6_NI_SUBJ_IPV6: 1188#if ICMP6_NI_SUBJ_IPV6 != 0 1189 case 0: 1190#endif 1191 /* 1192 * backward compatibility - try to accept 03 draft 1193 * format, where no Subject is present. 1194 */ 1195 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 && 1196 subjlen == 0) { 1197 oldfqdn++; 1198 break; 1199 } 1200#if ICMP6_NI_SUBJ_IPV6 != 0 1201 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6) 1202 goto bad; 1203#endif 1204 1205 if (subjlen != sizeof(sin6.sin6_addr)) 1206 goto bad; 1207 1208 /* 1209 * Validate Subject address. 1210 * 1211 * Not sure what exactly does "address belongs to the 1212 * node" mean in the spec, is it just unicast, or what? 1213 * 1214 * At this moment we consider Subject address as 1215 * "belong to the node" if the Subject address equals 1216 * to the IPv6 destination address; validation for 1217 * IPv6 destination address should have done enough 1218 * check for us. 1219 * 1220 * We do not do proxy at this moment. 1221 */ 1222 /* m_pulldown instead of copy? */ 1223 m_copydata(m, off + sizeof(struct icmp6_nodeinfo), 1224 subjlen, (caddr_t)&sin6.sin6_addr); 1225 /* XXX kame scope hack */ 1226 if (IN6_IS_SCOPE_LINKLOCAL(&sin6.sin6_addr)) { 1227#ifdef FAKE_LOOPBACK_IF 1228 if ((m->m_flags & M_PKTHDR) != 0 && 1229 m->m_pkthdr.rcvif) { 1230 sin6.sin6_addr.s6_addr16[1] = 1231 htons(m->m_pkthdr.rcvif->if_index); 1232 } 1233#else 1234 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 1235 sin6.sin6_addr.s6_addr16[1] = 1236 ip6->ip6_dst.s6_addr16[1]; 1237 } 1238#endif 1239 } 1240 subj = (char *)&sin6; 1241 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &sin6.sin6_addr)) 1242 break; 1243 1244 /* 1245 * XXX if we are to allow other cases, we should really 1246 * be careful about scope here. 1247 * basically, we should disallow queries toward IPv6 1248 * destination X with subject Y, if scope(X) > scope(Y). 1249 * if we allow scope(X) > scope(Y), it will result in 1250 * information leakage across scope boundary. 1251 */ 1252 goto bad; 1253 1254 case ICMP6_NI_SUBJ_FQDN: 1255 /* 1256 * Validate Subject name with gethostname(3). 1257 * 1258 * The behavior may need some debate, since: 1259 * - we are not sure if the node has FQDN as 1260 * hostname (returned by gethostname(3)). 1261 * - the code does wildcard match for truncated names. 1262 * however, we are not sure if we want to perform 1263 * wildcard match, if gethostname(3) side has 1264 * truncated hostname. 1265 */ 1266 n = ni6_nametodns(hostname, hostnamelen, 0); 1267 if (!n || n->m_next || n->m_len == 0) 1268 goto bad; 1269 IP6_EXTHDR_GET(subj, char *, m, 1270 off + sizeof(struct icmp6_nodeinfo), subjlen); 1271 if (subj == NULL) 1272 goto bad; 1273 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *), 1274 n->m_len)) { 1275 goto bad; 1276 } 1277 m_freem(n); 1278 n = NULL; 1279 break; 1280 1281 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */ 1282 default: 1283 goto bad; 1284 } 1285 break; 1286 } 1287 1288 /* guess reply length */ 1289 switch (qtype) { 1290 case NI_QTYPE_NOOP: 1291 break; /* no reply data */ 1292 case NI_QTYPE_SUPTYPES: 1293 replylen += sizeof(u_int32_t); 1294 break; 1295 case NI_QTYPE_FQDN: 1296 /* XXX will append an mbuf */ 1297 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1298 break; 1299 case NI_QTYPE_NODEADDR: 1300 addrs = ni6_addrs(ni6, m, &ifp, subj); 1301 if ((replylen += addrs * (sizeof(struct in6_addr) + 1302 sizeof(u_int32_t))) > MCLBYTES) 1303 replylen = MCLBYTES; /* XXX: will truncate pkt later */ 1304 break; 1305 default: 1306 /* 1307 * XXX: We must return a reply with the ICMP6 code 1308 * `unknown Qtype' in this case. However we regard the case 1309 * as an FQDN query for backward compatibility. 1310 * Older versions set a random value to this field, 1311 * so it rarely varies in the defined qtypes. 1312 * But the mechanism is not reliable... 1313 * maybe we should obsolete older versions. 1314 */ 1315 qtype = NI_QTYPE_FQDN; 1316 /* XXX will append an mbuf */ 1317 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1318 oldfqdn++; 1319 break; 1320 } 1321 1322 /* allocate an mbuf to reply. */ 1323 MGETHDR(n, M_DONTWAIT, m->m_type); 1324 if (n == NULL) { 1325 m_freem(m); 1326 return(NULL); 1327 } 1328 M_COPY_PKTHDR(n, m); /* just for recvif */ 1329 if (replylen > MHLEN) { 1330 if (replylen > MCLBYTES) { 1331 /* 1332 * XXX: should we try to allocate more? But MCLBYTES 1333 * is probably much larger than IPV6_MMTU... 1334 */ 1335 goto bad; 1336 } 1337 MCLGET(n, M_DONTWAIT); 1338 if ((n->m_flags & M_EXT) == 0) { 1339 goto bad; 1340 } 1341 } 1342 n->m_pkthdr.len = n->m_len = replylen; 1343 1344 /* copy mbuf header and IPv6 + Node Information base headers */ 1345 bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr)); 1346 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1); 1347 bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo)); 1348 1349 /* qtype dependent procedure */ 1350 switch (qtype) { 1351 case NI_QTYPE_NOOP: 1352 nni6->ni_code = ICMP6_NI_SUCCESS; 1353 nni6->ni_flags = 0; 1354 break; 1355 case NI_QTYPE_SUPTYPES: 1356 { 1357 u_int32_t v; 1358 nni6->ni_code = ICMP6_NI_SUCCESS; 1359 nni6->ni_flags = htons(0x0000); /* raw bitmap */ 1360 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */ 1361 v = (u_int32_t)htonl(0x0000000f); 1362 bcopy(&v, nni6 + 1, sizeof(u_int32_t)); 1363 break; 1364 } 1365 case NI_QTYPE_FQDN: 1366 nni6->ni_code = ICMP6_NI_SUCCESS; 1367 fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) + 1368 sizeof(struct ip6_hdr) + 1369 sizeof(struct icmp6_nodeinfo)); 1370 nni6->ni_flags = 0; /* XXX: meaningless TTL */ 1371 fqdn->ni_fqdn_ttl = 0; /* ditto. */ 1372 /* 1373 * XXX do we really have FQDN in variable "hostname"? 1374 */ 1375 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn); 1376 if (n->m_next == NULL) 1377 goto bad; 1378 /* XXX we assume that n->m_next is not a chain */ 1379 if (n->m_next->m_next != NULL) 1380 goto bad; 1381 n->m_pkthdr.len += n->m_next->m_len; 1382 break; 1383 case NI_QTYPE_NODEADDR: 1384 { 1385 int lenlim, copied; 1386 1387 nni6->ni_code = ICMP6_NI_SUCCESS; 1388 n->m_pkthdr.len = n->m_len = 1389 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1390 lenlim = M_TRAILINGSPACE(n); 1391 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim); 1392 /* XXX: reset mbuf length */ 1393 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 1394 sizeof(struct icmp6_nodeinfo) + copied; 1395 break; 1396 } 1397 default: 1398 break; /* XXX impossible! */ 1399 } 1400 1401 nni6->ni_type = ICMP6_NI_REPLY; 1402 m_freem(m); 1403 return(n); 1404 1405 bad: 1406 m_freem(m); 1407 if (n) 1408 m_freem(n); 1409 return(NULL); 1410} 1411#undef hostnamelen 1412 1413/* 1414 * make a mbuf with DNS-encoded string. no compression support. 1415 * 1416 * XXX names with less than 2 dots (like "foo" or "foo.section") will be 1417 * treated as truncated name (two \0 at the end). this is a wild guess. 1418 */ 1419static struct mbuf * 1420ni6_nametodns(name, namelen, old) 1421 const char *name; 1422 int namelen; 1423 int old; /* return pascal string if non-zero */ 1424{ 1425 struct mbuf *m; 1426 char *cp, *ep; 1427 const char *p, *q; 1428 int i, len, nterm; 1429 1430 if (old) 1431 len = namelen + 1; 1432 else 1433 len = MCLBYTES; 1434 1435 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */ 1436 MGET(m, M_DONTWAIT, MT_DATA); 1437 if (m && len > MLEN) { 1438 MCLGET(m, M_DONTWAIT); 1439 if ((m->m_flags & M_EXT) == 0) 1440 goto fail; 1441 } 1442 if (!m) 1443 goto fail; 1444 m->m_next = NULL; 1445 1446 if (old) { 1447 m->m_len = len; 1448 *mtod(m, char *) = namelen; 1449 bcopy(name, mtod(m, char *) + 1, namelen); 1450 return m; 1451 } else { 1452 m->m_len = 0; 1453 cp = mtod(m, char *); 1454 ep = mtod(m, char *) + M_TRAILINGSPACE(m); 1455 1456 /* if not certain about my name, return empty buffer */ 1457 if (namelen == 0) 1458 return m; 1459 1460 /* 1461 * guess if it looks like shortened hostname, or FQDN. 1462 * shortened hostname needs two trailing "\0". 1463 */ 1464 i = 0; 1465 for (p = name; p < name + namelen; p++) { 1466 if (*p && *p == '.') 1467 i++; 1468 } 1469 if (i < 2) 1470 nterm = 2; 1471 else 1472 nterm = 1; 1473 1474 p = name; 1475 while (cp < ep && p < name + namelen) { 1476 i = 0; 1477 for (q = p; q < name + namelen && *q && *q != '.'; q++) 1478 i++; 1479 /* result does not fit into mbuf */ 1480 if (cp + i + 1 >= ep) 1481 goto fail; 1482 /* DNS label length restriction, RFC1035 page 8 */ 1483 if (i >= 64) 1484 goto fail; 1485 *cp++ = i; 1486 bcopy(p, cp, i); 1487 cp += i; 1488 p = q; 1489 if (p < name + namelen && *p == '.') 1490 p++; 1491 } 1492 /* termination */ 1493 if (cp + nterm >= ep) 1494 goto fail; 1495 while (nterm-- > 0) 1496 *cp++ = '\0'; 1497 m->m_len = cp - mtod(m, char *); 1498 return m; 1499 } 1500 1501 panic("should not reach here"); 1502 /*NOTREACHED*/ 1503 1504 fail: 1505 if (m) 1506 m_freem(m); 1507 return NULL; 1508} 1509 1510/* 1511 * check if two DNS-encoded string matches. takes care of truncated 1512 * form (with \0\0 at the end). no compression support. 1513 * XXX upper/lowercase match (see RFC2065) 1514 */ 1515static int 1516ni6_dnsmatch(a, alen, b, blen) 1517 const char *a; 1518 int alen; 1519 const char *b; 1520 int blen; 1521{ 1522 const char *a0, *b0; 1523 int l; 1524 1525 /* simplest case - need validation? */ 1526 if (alen == blen && bcmp(a, b, alen) == 0) 1527 return 1; 1528 1529 a0 = a; 1530 b0 = b; 1531 1532 /* termination is mandatory */ 1533 if (alen < 2 || blen < 2) 1534 return 0; 1535 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0') 1536 return 0; 1537 alen--; 1538 blen--; 1539 1540 while (a - a0 < alen && b - b0 < blen) { 1541 if (a - a0 + 1 > alen || b - b0 + 1 > blen) 1542 return 0; 1543 1544 if ((signed char)a[0] < 0 || (signed char)b[0] < 0) 1545 return 0; 1546 /* we don't support compression yet */ 1547 if (a[0] >= 64 || b[0] >= 64) 1548 return 0; 1549 1550 /* truncated case */ 1551 if (a[0] == 0 && a - a0 == alen - 1) 1552 return 1; 1553 if (b[0] == 0 && b - b0 == blen - 1) 1554 return 1; 1555 if (a[0] == 0 || b[0] == 0) 1556 return 0; 1557 1558 if (a[0] != b[0]) 1559 return 0; 1560 l = a[0]; 1561 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen) 1562 return 0; 1563 if (bcmp(a + 1, b + 1, l) != 0) 1564 return 0; 1565 1566 a += 1 + l; 1567 b += 1 + l; 1568 } 1569 1570 if (a - a0 == alen && b - b0 == blen) 1571 return 1; 1572 else 1573 return 0; 1574} 1575 1576/* 1577 * calculate the number of addresses to be returned in the node info reply. 1578 */ 1579static int 1580ni6_addrs(ni6, m, ifpp, subj) 1581 struct icmp6_nodeinfo *ni6; 1582 struct mbuf *m; 1583 struct ifnet **ifpp; 1584 char *subj; 1585{ 1586 register struct ifnet *ifp; 1587 register struct in6_ifaddr *ifa6; 1588 register struct ifaddr *ifa; 1589 struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */ 1590 int addrs = 0, addrsofif, iffound = 0; 1591 int niflags = ni6->ni_flags; 1592 1593 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) { 1594 switch(ni6->ni_code) { 1595 case ICMP6_NI_SUBJ_IPV6: 1596 if (subj == NULL) /* must be impossible... */ 1597 return(0); 1598 subj_ip6 = (struct sockaddr_in6 *)subj; 1599 break; 1600 default: 1601 /* 1602 * XXX: we only support IPv6 subject address for 1603 * this Qtype. 1604 */ 1605 return(0); 1606 } 1607 } 1608 1609 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) 1610 { 1611 addrsofif = 0; 1612 for (ifa = ifp->if_addrlist.tqh_first; ifa; 1613 ifa = ifa->ifa_list.tqe_next) 1614 { 1615 if (ifa->ifa_addr->sa_family != AF_INET6) 1616 continue; 1617 ifa6 = (struct in6_ifaddr *)ifa; 1618 1619 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 && 1620 IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr, 1621 &ifa6->ia_addr.sin6_addr)) 1622 iffound = 1; 1623 1624 /* 1625 * IPv4-mapped addresses can only be returned by a 1626 * Node Information proxy, since they represent 1627 * addresses of IPv4-only nodes, which perforce do 1628 * not implement this protocol. 1629 * [icmp-name-lookups-07, Section 5.4] 1630 * So we don't support NI_NODEADDR_FLAG_COMPAT in 1631 * this function at this moment. 1632 */ 1633 1634 /* What do we have to do about ::1? */ 1635 switch(in6_addrscope(&ifa6->ia_addr.sin6_addr)) { 1636 case IPV6_ADDR_SCOPE_LINKLOCAL: 1637 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) 1638 == 0) 1639 continue; 1640 break; 1641 case IPV6_ADDR_SCOPE_SITELOCAL: 1642 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) 1643 == 0) 1644 continue; 1645 break; 1646 case IPV6_ADDR_SCOPE_GLOBAL: 1647 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) 1648 == 0) 1649 continue; 1650 break; 1651 default: 1652 continue; 1653 } 1654 1655 /* 1656 * check if anycast is okay. 1657 * XXX: just experimental. not in the spec. 1658 */ 1659 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1660 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 1661 continue; /* we need only unicast addresses */ 1662 1663 addrsofif++; /* count the address */ 1664 } 1665 if (iffound) { 1666 *ifpp = ifp; 1667 return(addrsofif); 1668 } 1669 1670 addrs += addrsofif; 1671 } 1672 1673 return(addrs); 1674} 1675 1676static int 1677ni6_store_addrs(ni6, nni6, ifp0, resid) 1678 struct icmp6_nodeinfo *ni6, *nni6; 1679 struct ifnet *ifp0; 1680 int resid; 1681{ 1682 register struct ifnet *ifp = ifp0 ? ifp0 : TAILQ_FIRST(&ifnet); 1683 register struct in6_ifaddr *ifa6; 1684 register struct ifaddr *ifa; 1685 struct ifnet *ifp_dep = NULL; 1686 int copied = 0, allow_deprecated = 0; 1687 u_char *cp = (u_char *)(nni6 + 1); 1688 int niflags = ni6->ni_flags; 1689 u_int32_t ltime; 1690 long time_second = time.tv_sec; 1691 1692 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL)) 1693 return(0); /* needless to copy */ 1694 1695 again: 1696 1697 for (; ifp; ifp = TAILQ_NEXT(ifp, if_list)) 1698 { 1699 for (ifa = ifp->if_addrlist.tqh_first; ifa; 1700 ifa = ifa->ifa_list.tqe_next) 1701 { 1702 if (ifa->ifa_addr->sa_family != AF_INET6) 1703 continue; 1704 ifa6 = (struct in6_ifaddr *)ifa; 1705 1706 if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) != 0 && 1707 allow_deprecated == 0) { 1708 /* 1709 * prefererred address should be put before 1710 * deprecated addresses. 1711 */ 1712 1713 /* record the interface for later search */ 1714 if (ifp_dep == NULL) 1715 ifp_dep = ifp; 1716 1717 continue; 1718 } 1719 else if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) == 0 && 1720 allow_deprecated != 0) 1721 continue; /* we now collect deprecated addrs */ 1722 1723 /* What do we have to do about ::1? */ 1724 switch(in6_addrscope(&ifa6->ia_addr.sin6_addr)) { 1725 case IPV6_ADDR_SCOPE_LINKLOCAL: 1726 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) 1727 == 0) 1728 continue; 1729 break; 1730 case IPV6_ADDR_SCOPE_SITELOCAL: 1731 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) 1732 == 0) 1733 continue; 1734 break; 1735 case IPV6_ADDR_SCOPE_GLOBAL: 1736 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) 1737 == 0) 1738 continue; 1739 break; 1740 default: 1741 continue; 1742 } 1743 1744 /* 1745 * check if anycast is okay. 1746 * XXX: just experimental. not in the spec. 1747 */ 1748 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1749 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 1750 continue; 1751 1752 /* now we can copy the address */ 1753 if (resid < sizeof(struct in6_addr) + 1754 sizeof(u_int32_t)) { 1755 /* 1756 * We give up much more copy. 1757 * Set the truncate flag and return. 1758 */ 1759 nni6->ni_flags |= 1760 NI_NODEADDR_FLAG_TRUNCATE; 1761 return(copied); 1762 } 1763 1764 /* 1765 * Set the TTL of the address. 1766 * The TTL value should be one of the following 1767 * according to the specification: 1768 * 1769 * 1. The remaining lifetime of a DHCP lease on the 1770 * address, or 1771 * 2. The remaining Valid Lifetime of a prefix from 1772 * which the address was derived through Stateless 1773 * Autoconfiguration. 1774 * 1775 * Note that we currently do not support stateful 1776 * address configuration by DHCPv6, so the former 1777 * case can't happen. 1778 */ 1779 if (ifa6->ia6_lifetime.ia6t_expire == 0) 1780 ltime = ND6_INFINITE_LIFETIME; 1781 else { 1782 if (ifa6->ia6_lifetime.ia6t_expire > 1783 time_second) 1784 ltime = htonl(ifa6->ia6_lifetime.ia6t_expire - time_second); 1785 else 1786 ltime = 0; 1787 } 1788 1789 bcopy(<ime, cp, sizeof(u_int32_t)); 1790 cp += sizeof(u_int32_t); 1791 1792 /* copy the address itself */ 1793 bcopy(&ifa6->ia_addr.sin6_addr, cp, 1794 sizeof(struct in6_addr)); 1795 /* XXX: KAME link-local hack; remove ifindex */ 1796 if (IN6_IS_ADDR_LINKLOCAL(&ifa6->ia_addr.sin6_addr)) 1797 ((struct in6_addr *)cp)->s6_addr16[1] = 0; 1798 cp += sizeof(struct in6_addr); 1799 1800 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1801 copied += (sizeof(struct in6_addr) + 1802 sizeof(u_int32_t)); 1803 } 1804 if (ifp0) /* we need search only on the specified IF */ 1805 break; 1806 } 1807 1808 if (allow_deprecated == 0 && ifp_dep != NULL) { 1809 ifp = ifp_dep; 1810 allow_deprecated = 1; 1811 1812 goto again; 1813 } 1814 1815 return(copied); 1816} 1817 1818/* 1819 * XXX almost dup'ed code with rip6_input. 1820 */ 1821static int 1822icmp6_rip6_input(mp, off) 1823 struct mbuf **mp; 1824 int off; 1825{ 1826 struct mbuf *m = *mp; 1827 register struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1828 register struct in6pcb *in6p; 1829 struct in6pcb *last = NULL; 1830 struct sockaddr_in6 rip6src; 1831 struct icmp6_hdr *icmp6; 1832 struct mbuf *opts = NULL; 1833 1834#ifndef PULLDOWN_TEST 1835 /* this is assumed to be safe. */ 1836 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off); 1837#else 1838 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 1839 if (icmp6 == NULL) { 1840 /* m is already reclaimed */ 1841 return IPPROTO_DONE; 1842 } 1843#endif 1844 1845 bzero(&rip6src, sizeof(rip6src)); 1846 rip6src.sin6_len = sizeof(struct sockaddr_in6); 1847 rip6src.sin6_family = AF_INET6; 1848 /* KAME hack: recover scopeid */ 1849 (void)in6_recoverscope(&rip6src, &ip6->ip6_src, m->m_pkthdr.rcvif); 1850 1851 for (in6p = rawin6pcb.in6p_next; 1852 in6p != &rawin6pcb; in6p = in6p->in6p_next) 1853 { 1854 if (in6p->in6p_ip6_nxt != IPPROTO_ICMPV6) 1855 continue; 1856 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && 1857 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst)) 1858 continue; 1859 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) && 1860 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src)) 1861 continue; 1862 if (in6p->in6p_icmp6filt 1863 && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type, 1864 in6p->in6p_icmp6filt)) 1865 continue; 1866 if (last) { 1867 struct mbuf *n; 1868 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { 1869 if (last->in6p_flags & IN6P_CONTROLOPTS) 1870 ip6_savecontrol(last, &opts, ip6, n); 1871 /* strip intermediate headers */ 1872 m_adj(n, off); 1873 if (sbappendaddr(&last->in6p_socket->so_rcv, 1874 (struct sockaddr *)&rip6src, 1875 n, opts) == 0) { 1876 /* should notify about lost packet */ 1877 m_freem(n); 1878 if (opts) 1879 m_freem(opts); 1880 } else 1881 sorwakeup(last->in6p_socket); 1882 opts = NULL; 1883 } 1884 } 1885 last = in6p; 1886 } 1887 if (last) { 1888 if (last->in6p_flags & IN6P_CONTROLOPTS) 1889 ip6_savecontrol(last, &opts, ip6, m); 1890 /* strip intermediate headers */ 1891 m_adj(m, off); 1892 if (sbappendaddr(&last->in6p_socket->so_rcv, 1893 (struct sockaddr *)&rip6src, m, opts) == 0) { 1894 m_freem(m); 1895 if (opts) 1896 m_freem(opts); 1897 } else 1898 sorwakeup(last->in6p_socket); 1899 } else { 1900 m_freem(m); 1901 ip6stat.ip6s_delivered--; 1902 } 1903 return IPPROTO_DONE; 1904} 1905 1906/* 1907 * Reflect the ip6 packet back to the source. 1908 * OFF points to the icmp6 header, counted from the top of the mbuf. 1909 */ 1910void 1911icmp6_reflect(m, off) 1912 struct mbuf *m; 1913 size_t off; 1914{ 1915 struct ip6_hdr *ip6; 1916 struct icmp6_hdr *icmp6; 1917 struct in6_ifaddr *ia; 1918 struct in6_addr t, *src = 0; 1919 int plen; 1920 int type, code; 1921 struct ifnet *outif = NULL; 1922#ifdef COMPAT_RFC1885 1923 int mtu = IPV6_MMTU; 1924 struct sockaddr_in6 *sin6 = &icmp6_reflect_rt.ro_dst; 1925#endif 1926 1927 /* too short to reflect */ 1928 if (off < sizeof(struct ip6_hdr)) { 1929 printf("sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n", 1930 (u_long)off, (u_long)sizeof(struct ip6_hdr), 1931 __FILE__, __LINE__); 1932 goto bad; 1933 } 1934 1935 /* 1936 * If there are extra headers between IPv6 and ICMPv6, strip 1937 * off that header first. 1938 */ 1939#ifdef DIAGNOSTIC 1940 if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN) 1941 panic("assumption failed in icmp6_reflect"); 1942#endif 1943 if (off > sizeof(struct ip6_hdr)) { 1944 size_t l; 1945 struct ip6_hdr nip6; 1946 1947 l = off - sizeof(struct ip6_hdr); 1948 m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6); 1949 m_adj(m, l); 1950 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 1951 if (m->m_len < l) { 1952 if ((m = m_pullup(m, l)) == NULL) 1953 return; 1954 } 1955 bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6)); 1956 } else /* off == sizeof(struct ip6_hdr) */ { 1957 size_t l; 1958 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 1959 if (m->m_len < l) { 1960 if ((m = m_pullup(m, l)) == NULL) 1961 return; 1962 } 1963 } 1964 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr); 1965 ip6 = mtod(m, struct ip6_hdr *); 1966 ip6->ip6_nxt = IPPROTO_ICMPV6; 1967 icmp6 = (struct icmp6_hdr *)(ip6 + 1); 1968 type = icmp6->icmp6_type; /* keep type for statistics */ 1969 code = icmp6->icmp6_code; /* ditto. */ 1970 1971 t = ip6->ip6_dst; 1972 /* 1973 * ip6_input() drops a packet if its src is multicast. 1974 * So, the src is never multicast. 1975 */ 1976 ip6->ip6_dst = ip6->ip6_src; 1977 1978 /* XXX hack for link-local addresses */ 1979 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) 1980 ip6->ip6_dst.s6_addr16[1] = 1981 htons(m->m_pkthdr.rcvif->if_index); 1982 if (IN6_IS_ADDR_LINKLOCAL(&t)) 1983 t.s6_addr16[1] = htons(m->m_pkthdr.rcvif->if_index); 1984 1985#ifdef COMPAT_RFC1885 1986 /* 1987 * xxx guess MTU 1988 * RFC 1885 requires that echo reply should be truncated if it 1989 * does not fit in with (return) path MTU, but the description was 1990 * removed in the new spec. 1991 */ 1992 if (icmp6_reflect_rt.ro_rt == 0 || 1993 ! (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &ip6->ip6_dst))) { 1994 if (icmp6_reflect_rt.ro_rt) { 1995 icmp6_reflect_rt.ro_rt = 0; 1996 } 1997 bzero(sin6, sizeof(*sin6)); 1998 sin6->sin6_family = PF_INET6; 1999 sin6->sin6_len = sizeof(struct sockaddr_in6); 2000 sin6->sin6_addr = ip6->ip6_dst; 2001 2002 rtalloc((struct route *)&icmp6_reflect_rt.ro_rt); 2003 } 2004 2005 if (icmp6_reflect_rt.ro_rt == 0) 2006 goto bad; 2007 2008 if ((icmp6_reflect_rt.ro_rt->rt_flags & RTF_HOST) 2009 && mtu < icmp6_reflect_rt.ro_rt->rt_ifp->if_mtu) 2010 mtu = icmp6_reflect_rt.ro_rt->rt_rmx.rmx_mtu; 2011 2012 if (mtu < m->m_pkthdr.len) { 2013 plen -= (m->m_pkthdr.len - mtu); 2014 m_adj(m, mtu - m->m_pkthdr.len); 2015 } 2016#endif 2017 /* 2018 * If the incoming packet was addressed directly to us(i.e. unicast), 2019 * use dst as the src for the reply. 2020 * The IN6_IFF_NOTREADY case would be VERY rare, but is possible 2021 * (for example) when we encounter an error while forwarding procedure 2022 * destined to a duplicated address of ours. 2023 */ 2024 for (ia = in6_ifaddr; ia; ia = ia->ia_next) 2025 if (IN6_ARE_ADDR_EQUAL(&t, &ia->ia_addr.sin6_addr) && 2026 (ia->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) { 2027 src = &t; 2028 break; 2029 } 2030 if (ia == NULL && IN6_IS_ADDR_LINKLOCAL(&t) && (m->m_flags & M_LOOP)) { 2031 /* 2032 * This is the case if the dst is our link-local address 2033 * and the sender is also ourseleves. 2034 */ 2035 src = &t; 2036 } 2037 2038 if (src == 0) 2039 /* 2040 * This case matches to multicasts, our anycast, or unicasts 2041 * that we do not own. Select a source address which has the 2042 * same scope. 2043 * XXX: for (non link-local) multicast addresses, this might 2044 * not be a good choice. 2045 */ 2046 if ((ia = in6_ifawithscope(m->m_pkthdr.rcvif, &t)) != 0) 2047 src = &IA6_SIN6(ia)->sin6_addr; 2048 2049 if (src == 0) 2050 goto bad; 2051 2052 ip6->ip6_src = *src; 2053 2054 ip6->ip6_flow = 0; 2055 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2056 ip6->ip6_vfc |= IPV6_VERSION; 2057 ip6->ip6_nxt = IPPROTO_ICMPV6; 2058 if (m->m_pkthdr.rcvif) { 2059 /* XXX: This may not be the outgoing interface */ 2060 ip6->ip6_hlim = nd_ifinfo[m->m_pkthdr.rcvif->if_index].chlim; 2061 } 2062 2063 icmp6->icmp6_cksum = 0; 2064 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6, 2065 sizeof(struct ip6_hdr), plen); 2066 2067 /* 2068 * xxx option handling 2069 */ 2070 2071 m->m_flags &= ~(M_BCAST|M_MCAST); 2072#ifdef IPSEC 2073 /* Don't lookup socket */ 2074 ipsec_setsocket(m, NULL); 2075#endif /*IPSEC*/ 2076 2077#ifdef COMPAT_RFC1885 2078 ip6_output(m, NULL, &icmp6_reflect_rt, 0, NULL, &outif); 2079#else 2080 ip6_output(m, NULL, NULL, 0, NULL, &outif); 2081#endif 2082 if (outif) 2083 icmp6_ifoutstat_inc(outif, type, code); 2084 2085 return; 2086 2087 bad: 2088 m_freem(m); 2089 return; 2090} 2091 2092void 2093icmp6_fasttimo() 2094{ 2095 2096 mld6_fasttimeo(); 2097} 2098 2099static const char * 2100icmp6_redirect_diag(src6, dst6, tgt6) 2101 struct in6_addr *src6; 2102 struct in6_addr *dst6; 2103 struct in6_addr *tgt6; 2104{ 2105 static char buf[1024]; 2106 snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)", 2107 ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6)); 2108 return buf; 2109} 2110 2111void 2112icmp6_redirect_input(m, off) 2113 register struct mbuf *m; 2114 int off; 2115{ 2116 struct ifnet *ifp = m->m_pkthdr.rcvif; 2117 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 2118 struct nd_redirect *nd_rd; 2119 int icmp6len = ntohs(ip6->ip6_plen); 2120 char *lladdr = NULL; 2121 int lladdrlen = 0; 2122 u_char *redirhdr = NULL; 2123 int redirhdrlen = 0; 2124 struct rtentry *rt = NULL; 2125 int is_router; 2126 int is_onlink; 2127 struct in6_addr src6 = ip6->ip6_src; 2128 struct in6_addr redtgt6; 2129 struct in6_addr reddst6; 2130 union nd_opts ndopts; 2131 2132 if (!m || !ifp) 2133 return; 2134 2135 /* XXX if we are router, we don't update route by icmp6 redirect */ 2136 if (ip6_forwarding) 2137 goto freeit; 2138 if (!icmp6_rediraccept) 2139 goto freeit; 2140 2141#ifndef PULLDOWN_TEST 2142 IP6_EXTHDR_CHECK(m, off, icmp6len,); 2143 nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off); 2144#else 2145 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len); 2146 if (nd_rd == NULL) { 2147 icmp6stat.icp6s_tooshort++; 2148 return; 2149 } 2150#endif 2151 redtgt6 = nd_rd->nd_rd_target; 2152 reddst6 = nd_rd->nd_rd_dst; 2153 2154 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 2155 redtgt6.s6_addr16[1] = htons(ifp->if_index); 2156 if (IN6_IS_ADDR_LINKLOCAL(&reddst6)) 2157 reddst6.s6_addr16[1] = htons(ifp->if_index); 2158 2159 /* validation */ 2160 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) { 2161 log(LOG_ERR, 2162 "ICMP6 redirect sent from %s rejected; " 2163 "must be from linklocal\n", ip6_sprintf(&src6)); 2164 goto freeit; 2165 } 2166 if (ip6->ip6_hlim != 255) { 2167 log(LOG_ERR, 2168 "ICMP6 redirect sent from %s rejected; " 2169 "hlim=%d (must be 255)\n", 2170 ip6_sprintf(&src6), ip6->ip6_hlim); 2171 goto freeit; 2172 } 2173 { 2174 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */ 2175 struct sockaddr_in6 sin6; 2176 struct in6_addr *gw6; 2177 2178 bzero(&sin6, sizeof(sin6)); 2179 sin6.sin6_family = AF_INET6; 2180 sin6.sin6_len = sizeof(struct sockaddr_in6); 2181 bcopy(&reddst6, &sin6.sin6_addr, sizeof(reddst6)); 2182 rt = rtalloc1((struct sockaddr *)&sin6, 0); 2183 if (rt) { 2184 if (rt->rt_gateway == NULL || 2185 rt->rt_gateway->sa_family != AF_INET6) { 2186 log(LOG_ERR, 2187 "ICMP6 redirect rejected; no route " 2188 "with inet6 gateway found for redirect dst: %s\n", 2189 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); 2190 RTFREE(rt); 2191 goto freeit; 2192 } 2193 2194 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr); 2195 if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) { 2196 log(LOG_ERR, 2197 "ICMP6 redirect rejected; " 2198 "not equal to gw-for-src=%s (must be same): " 2199 "%s\n", 2200 ip6_sprintf(gw6), 2201 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); 2202 RTFREE(rt); 2203 goto freeit; 2204 } 2205 } else { 2206 log(LOG_ERR, 2207 "ICMP6 redirect rejected; " 2208 "no route found for redirect dst: %s\n", 2209 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); 2210 goto freeit; 2211 } 2212 RTFREE(rt); 2213 rt = NULL; 2214 } 2215 if (IN6_IS_ADDR_MULTICAST(&reddst6)) { 2216 log(LOG_ERR, 2217 "ICMP6 redirect rejected; " 2218 "redirect dst must be unicast: %s\n", 2219 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); 2220 goto freeit; 2221 } 2222 2223 is_router = is_onlink = 0; 2224 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 2225 is_router = 1; /* router case */ 2226 if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0) 2227 is_onlink = 1; /* on-link destination case */ 2228 if (!is_router && !is_onlink) { 2229 log(LOG_ERR, 2230 "ICMP6 redirect rejected; " 2231 "neither router case nor onlink case: %s\n", 2232 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); 2233 goto freeit; 2234 } 2235 /* validation passed */ 2236 2237 icmp6len -= sizeof(*nd_rd); 2238 nd6_option_init(nd_rd + 1, icmp6len, &ndopts); 2239 if (nd6_options(&ndopts) < 0) { 2240 log(LOG_INFO, "icmp6_redirect_input: " 2241 "invalid ND option, rejected: %s\n", 2242 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); 2243 goto freeit; 2244 } 2245 2246 if (ndopts.nd_opts_tgt_lladdr) { 2247 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 2248 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 2249 } 2250 2251 if (ndopts.nd_opts_rh) { 2252 redirhdrlen = ndopts.nd_opts_rh->nd_opt_rh_len; 2253 redirhdr = (u_char *)(ndopts.nd_opts_rh + 1); /* xxx */ 2254 } 2255 2256 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 2257 log(LOG_INFO, 2258 "icmp6_redirect_input: lladdrlen mismatch for %s " 2259 "(if %d, icmp6 packet %d): %s\n", 2260 ip6_sprintf(&redtgt6), ifp->if_addrlen, lladdrlen - 2, 2261 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); 2262 } 2263 2264 /* RFC 2461 8.3 */ 2265 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT, 2266 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER); 2267 2268 if (!is_onlink) { /* better router case. perform rtredirect. */ 2269 /* perform rtredirect */ 2270 struct sockaddr_in6 sdst; 2271 struct sockaddr_in6 sgw; 2272 struct sockaddr_in6 ssrc; 2273 2274 bzero(&sdst, sizeof(sdst)); 2275 bzero(&sgw, sizeof(sgw)); 2276 bzero(&ssrc, sizeof(ssrc)); 2277 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6; 2278 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len = 2279 sizeof(struct sockaddr_in6); 2280 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr)); 2281 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2282 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr)); 2283 rtredirect((struct sockaddr *)&sdst, (struct sockaddr *)&sgw, 2284 (struct sockaddr *)NULL, RTF_GATEWAY | RTF_HOST, 2285 (struct sockaddr *)&ssrc, 2286 (struct rtentry **)NULL 2287 ); 2288 } 2289 /* finally update cached route in each socket via pfctlinput */ 2290 { 2291 struct sockaddr_in6 sdst; 2292#if 1 2293#else 2294 struct ip6protosw *pr; 2295#endif 2296 2297 bzero(&sdst, sizeof(sdst)); 2298 sdst.sin6_family = AF_INET6; 2299 sdst.sin6_len = sizeof(struct sockaddr_in6); 2300 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2301#if 1 2302 pfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst); 2303#else 2304 /* 2305 * do not use pfctlinput() here, we have different prototype for 2306 * xx_ctlinput() in ip6proto. 2307 */ 2308 for (pr = (struct ip6protosw *)inet6domain.dom_protosw; 2309 pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; 2310 pr++) { 2311 if (pr->pr_ctlinput) { 2312 (*pr->pr_ctlinput)(PRC_REDIRECT_HOST, 2313 (struct sockaddr *)&sdst, NULL, NULL, 0); 2314 } 2315 } 2316#endif 2317#ifdef IPSEC 2318 key_sa_routechange((struct sockaddr *)&sdst); 2319#endif 2320 } 2321 2322 freeit: 2323 m_freem(m); 2324} 2325 2326void 2327icmp6_redirect_output(m0, rt) 2328 struct mbuf *m0; 2329 struct rtentry *rt; 2330{ 2331 struct ifnet *ifp; /* my outgoing interface */ 2332 struct in6_addr *ifp_ll6; 2333 struct in6_addr *router_ll6; 2334 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */ 2335 struct mbuf *m = NULL; /* newly allocated one */ 2336 struct ip6_hdr *ip6; /* m as struct ip6_hdr */ 2337 struct nd_redirect *nd_rd; 2338 size_t maxlen; 2339 u_char *p; 2340 struct ifnet *outif = NULL; 2341 struct sockaddr_in6 src_sa; 2342 2343 icmp6_errcount(&icmp6stat.icp6s_outerrhist, ND_REDIRECT, 0); 2344 2345 /* if we are not router, we don't send icmp6 redirect */ 2346 if (!ip6_forwarding || ip6_accept_rtadv) 2347 goto fail; 2348 2349 /* sanity check */ 2350 if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp)) 2351 goto fail; 2352 2353 /* 2354 * Address check: 2355 * the source address must identify a neighbor, and 2356 * the destination address must not be a multicast address 2357 * [RFC 2461, sec 8.2] 2358 */ 2359 sip6 = mtod(m0, struct ip6_hdr *); 2360 bzero(&src_sa, sizeof(src_sa)); 2361 src_sa.sin6_family = AF_INET6; 2362 src_sa.sin6_len = sizeof(src_sa); 2363 src_sa.sin6_addr = sip6->ip6_src; 2364 /* we don't currently use sin6_scope_id, but eventually use it */ 2365 src_sa.sin6_scope_id = in6_addr2scopeid(ifp, &sip6->ip6_src); 2366 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0) 2367 goto fail; 2368 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst)) 2369 goto fail; /* what should we do here? */ 2370 2371 /* rate limit */ 2372 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0)) 2373 goto fail; 2374 2375 /* 2376 * Since we are going to append up to 1280 bytes (= IPV6_MMTU), 2377 * we almost always ask for an mbuf cluster for simplicity. 2378 * (MHLEN < IPV6_MMTU is almost always true) 2379 */ 2380#if IPV6_MMTU >= MCLBYTES 2381# error assumption failed about IPV6_MMTU and MCLBYTES 2382#endif 2383 MGETHDR(m, M_DONTWAIT, MT_HEADER); 2384 if (m && IPV6_MMTU >= MHLEN) 2385 MCLGET(m, M_DONTWAIT); 2386 if (!m) 2387 goto fail; 2388 m->m_len = 0; 2389 maxlen = M_TRAILINGSPACE(m); 2390 maxlen = min(IPV6_MMTU, maxlen); 2391 /* just for safety */ 2392 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) + 2393 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) { 2394 goto fail; 2395 } 2396 2397 { 2398 /* get ip6 linklocal address for ifp(my outgoing interface). */ 2399 struct in6_ifaddr *ia; 2400 if ((ia = in6ifa_ifpforlinklocal(ifp, 2401 IN6_IFF_NOTREADY| 2402 IN6_IFF_ANYCAST)) == NULL) 2403 goto fail; 2404 ifp_ll6 = &ia->ia_addr.sin6_addr; 2405 } 2406 2407 /* get ip6 linklocal address for the router. */ 2408 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) { 2409 struct sockaddr_in6 *sin6; 2410 sin6 = (struct sockaddr_in6 *)rt->rt_gateway; 2411 router_ll6 = &sin6->sin6_addr; 2412 if (!IN6_IS_ADDR_LINKLOCAL(router_ll6)) 2413 router_ll6 = (struct in6_addr *)NULL; 2414 } else 2415 router_ll6 = (struct in6_addr *)NULL; 2416 2417 /* ip6 */ 2418 ip6 = mtod(m, struct ip6_hdr *); 2419 ip6->ip6_flow = 0; 2420 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2421 ip6->ip6_vfc |= IPV6_VERSION; 2422 /* ip6->ip6_plen will be set later */ 2423 ip6->ip6_nxt = IPPROTO_ICMPV6; 2424 ip6->ip6_hlim = 255; 2425 /* ip6->ip6_src must be linklocal addr for my outgoing if. */ 2426 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr)); 2427 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr)); 2428 2429 /* ND Redirect */ 2430 nd_rd = (struct nd_redirect *)(ip6 + 1); 2431 nd_rd->nd_rd_type = ND_REDIRECT; 2432 nd_rd->nd_rd_code = 0; 2433 nd_rd->nd_rd_reserved = 0; 2434 if (rt->rt_flags & RTF_GATEWAY) { 2435 /* 2436 * nd_rd->nd_rd_target must be a link-local address in 2437 * better router cases. 2438 */ 2439 if (!router_ll6) 2440 goto fail; 2441 bcopy(router_ll6, &nd_rd->nd_rd_target, 2442 sizeof(nd_rd->nd_rd_target)); 2443 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2444 sizeof(nd_rd->nd_rd_dst)); 2445 } else { 2446 /* make sure redtgt == reddst */ 2447 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target, 2448 sizeof(nd_rd->nd_rd_target)); 2449 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2450 sizeof(nd_rd->nd_rd_dst)); 2451 } 2452 2453 p = (u_char *)(nd_rd + 1); 2454 2455 if (!router_ll6) 2456 goto nolladdropt; 2457 2458 { 2459 /* target lladdr option */ 2460 struct rtentry *rt_router = NULL; 2461 int len; 2462 struct sockaddr_dl *sdl; 2463 struct nd_opt_hdr *nd_opt; 2464 char *lladdr; 2465 2466 rt_router = nd6_lookup(router_ll6, 0, ifp); 2467 if (!rt_router) 2468 goto nolladdropt; 2469 len = sizeof(*nd_opt) + ifp->if_addrlen; 2470 len = (len + 7) & ~7; /*round by 8*/ 2471 /* safety check */ 2472 if (len + (p - (u_char *)ip6) > maxlen) 2473 goto nolladdropt; 2474 if (!(rt_router->rt_flags & RTF_GATEWAY) && 2475 (rt_router->rt_flags & RTF_LLINFO) && 2476 (rt_router->rt_gateway->sa_family == AF_LINK) && 2477 (sdl = (struct sockaddr_dl *)rt_router->rt_gateway) && 2478 sdl->sdl_alen) { 2479 nd_opt = (struct nd_opt_hdr *)p; 2480 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 2481 nd_opt->nd_opt_len = len >> 3; 2482 lladdr = (char *)(nd_opt + 1); 2483 bcopy(LLADDR(sdl), lladdr, ifp->if_addrlen); 2484 p += len; 2485 } 2486 } 2487nolladdropt:; 2488 2489 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2490 2491 /* just to be safe */ 2492 if (m0->m_flags & M_DECRYPTED) 2493 goto noredhdropt; 2494 if (p - (u_char *)ip6 > maxlen) 2495 goto noredhdropt; 2496 2497 { 2498 /* redirected header option */ 2499 int len; 2500 struct nd_opt_rd_hdr *nd_opt_rh; 2501 2502 /* 2503 * compute the maximum size for icmp6 redirect header option. 2504 * XXX room for auth header? 2505 */ 2506 len = maxlen - (p - (u_char *)ip6); 2507 len &= ~7; 2508 2509 /* This is just for simplicity. */ 2510 if (m0->m_pkthdr.len != m0->m_len) { 2511 if (m0->m_next) { 2512 m_freem(m0->m_next); 2513 m0->m_next = NULL; 2514 } 2515 m0->m_pkthdr.len = m0->m_len; 2516 } 2517 2518 /* 2519 * Redirected header option spec (RFC2461 4.6.3) talks nothing 2520 * about padding/truncate rule for the original IP packet. 2521 * From the discussion on IPv6imp in Feb 1999, the consensus was: 2522 * - "attach as much as possible" is the goal 2523 * - pad if not aligned (original size can be guessed by original 2524 * ip6 header) 2525 * Following code adds the padding if it is simple enough, 2526 * and truncates if not. 2527 */ 2528 if (m0->m_next || m0->m_pkthdr.len != m0->m_len) 2529 panic("assumption failed in %s:%d\n", __FILE__, __LINE__); 2530 2531 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) { 2532 /* not enough room, truncate */ 2533 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh); 2534 } else { 2535 /* enough room, pad or truncate */ 2536 size_t extra; 2537 2538 extra = m0->m_pkthdr.len % 8; 2539 if (extra) { 2540 /* pad if easy enough, truncate if not */ 2541 if (8 - extra <= M_TRAILINGSPACE(m0)) { 2542 /* pad */ 2543 m0->m_len += (8 - extra); 2544 m0->m_pkthdr.len += (8 - extra); 2545 } else { 2546 /* truncate */ 2547 m0->m_pkthdr.len -= extra; 2548 m0->m_len -= extra; 2549 } 2550 } 2551 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh); 2552 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh); 2553 } 2554 2555 nd_opt_rh = (struct nd_opt_rd_hdr *)p; 2556 bzero(nd_opt_rh, sizeof(*nd_opt_rh)); 2557 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER; 2558 nd_opt_rh->nd_opt_rh_len = len >> 3; 2559 p += sizeof(*nd_opt_rh); 2560 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2561 2562 /* connect m0 to m */ 2563 m->m_next = m0; 2564 m->m_pkthdr.len = m->m_len + m0->m_len; 2565 } 2566noredhdropt:; 2567 2568 if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_src)) 2569 sip6->ip6_src.s6_addr16[1] = 0; 2570 if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_dst)) 2571 sip6->ip6_dst.s6_addr16[1] = 0; 2572#if 0 2573 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src)) 2574 ip6->ip6_src.s6_addr16[1] = 0; 2575 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) 2576 ip6->ip6_dst.s6_addr16[1] = 0; 2577#endif 2578 if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_target)) 2579 nd_rd->nd_rd_target.s6_addr16[1] = 0; 2580 if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_dst)) 2581 nd_rd->nd_rd_dst.s6_addr16[1] = 0; 2582 2583 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 2584 2585 nd_rd->nd_rd_cksum = 0; 2586 nd_rd->nd_rd_cksum 2587 = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen)); 2588 2589 /* send the packet to outside... */ 2590#ifdef IPSEC 2591 /* Don't lookup socket */ 2592 ipsec_setsocket(m, NULL); 2593#endif /*IPSEC*/ 2594 ip6_output(m, NULL, NULL, 0, NULL, &outif); 2595 if (outif) { 2596 icmp6_ifstat_inc(outif, ifs6_out_msg); 2597 icmp6_ifstat_inc(outif, ifs6_out_redirect); 2598 } 2599 icmp6stat.icp6s_outhist[ND_REDIRECT]++; 2600 2601 return; 2602 2603fail: 2604 if (m) 2605 m_freem(m); 2606 if (m0) 2607 m_freem(m0); 2608} 2609 2610/* 2611 * ICMPv6 socket option processing. 2612 */ 2613int 2614icmp6_ctloutput(op, so, level, optname, mp) 2615 int op; 2616 struct socket *so; 2617 int level, optname; 2618 struct mbuf **mp; 2619{ 2620 register struct in6pcb *in6p = sotoin6pcb(so); 2621 register struct mbuf *m = *mp; 2622 int error = 0; 2623 2624 if (level != IPPROTO_ICMPV6) { 2625 error = EINVAL; 2626 if (op == PRCO_SETOPT && m) 2627 (void)m_free(m); 2628 } else switch(op) { 2629 case PRCO_SETOPT: 2630 switch (optname) { 2631 case ICMP6_FILTER: 2632 { 2633 struct icmp6_filter *p; 2634 2635 p = mtod(m, struct icmp6_filter *); 2636 if (!p || !in6p->in6p_icmp6filt) { 2637 error = EINVAL; 2638 break; 2639 } 2640 bcopy(p, in6p->in6p_icmp6filt, 2641 sizeof(struct icmp6_filter)); 2642 error = 0; 2643 break; 2644 } 2645 2646 default: 2647 error = ENOPROTOOPT; 2648 break; 2649 } 2650 if (m) 2651 (void)m_free(m); 2652 break; 2653 2654 case PRCO_GETOPT: 2655 switch (optname) { 2656 case ICMP6_FILTER: 2657 { 2658 struct icmp6_filter *p; 2659 2660 if (!in6p->in6p_icmp6filt) { 2661 error = EINVAL; 2662 break; 2663 } 2664 *mp = m = m_get(M_WAIT, MT_SOOPTS); 2665 m->m_len = sizeof(struct icmp6_filter); 2666 p = mtod(m, struct icmp6_filter *); 2667 bcopy(in6p->in6p_icmp6filt, p, 2668 sizeof(struct icmp6_filter)); 2669 error = 0; 2670 break; 2671 } 2672 2673 default: 2674 error = ENOPROTOOPT; 2675 break; 2676 } 2677 break; 2678 } 2679 2680 return(error); 2681} 2682 2683/* 2684 * Perform rate limit check. 2685 * Returns 0 if it is okay to send the icmp6 packet. 2686 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate 2687 * limitation. 2688 * 2689 * XXX per-destination/type check necessary? 2690 */ 2691static int 2692icmp6_ratelimit(dst, type, code) 2693 const struct in6_addr *dst; /* not used at this moment */ 2694 const int type; /* not used at this moment */ 2695 const int code; /* not used at this moment */ 2696{ 2697 int ret; 2698 2699 ret = 0; /*okay to send*/ 2700 2701 /* PPS limit */ 2702 if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count, 2703 icmp6errppslim)) { 2704 /* The packet is subject to rate limit */ 2705 ret++; 2706 } 2707 2708 return ret; 2709} 2710 2711static struct rtentry * 2712icmp6_mtudisc_clone(dst) 2713 struct sockaddr *dst; 2714{ 2715 struct rtentry *rt; 2716 int error; 2717 2718 rt = rtalloc1(dst, 1); 2719 if (rt == 0) 2720 return NULL; 2721 2722 /* If we didn't get a host route, allocate one */ 2723 if ((rt->rt_flags & RTF_HOST) == 0) { 2724 struct rtentry *nrt; 2725 2726 error = rtrequest((int) RTM_ADD, dst, 2727 (struct sockaddr *) rt->rt_gateway, 2728 (struct sockaddr *) 0, 2729 RTF_GATEWAY | RTF_HOST | RTF_DYNAMIC, &nrt); 2730 if (error) { 2731 rtfree(rt); 2732 rtfree(nrt); 2733 return NULL; 2734 } 2735 nrt->rt_rmx = rt->rt_rmx; 2736 rtfree(rt); 2737 rt = nrt; 2738 } 2739 error = rt_timer_add(rt, icmp6_mtudisc_timeout, 2740 icmp6_mtudisc_timeout_q); 2741 if (error) { 2742 rtfree(rt); 2743 return NULL; 2744 } 2745 2746 return rt; /* caller need to call rtfree() */ 2747} 2748 2749static void 2750icmp6_mtudisc_timeout(rt, r) 2751 struct rtentry *rt; 2752 struct rttimer *r; 2753{ 2754 if (rt == NULL) 2755 panic("icmp6_mtudisc_timeout: bad route to timeout"); 2756 if ((rt->rt_flags & (RTF_DYNAMIC | RTF_HOST)) == 2757 (RTF_DYNAMIC | RTF_HOST)) { 2758 rtrequest((int) RTM_DELETE, (struct sockaddr *)rt_key(rt), 2759 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0); 2760 } else { 2761 if ((rt->rt_rmx.rmx_locks & RTV_MTU) == 0) { 2762 rt->rt_rmx.rmx_mtu = 0; 2763 } 2764 } 2765} 2766 2767#include <uvm/uvm_extern.h> 2768#include <sys/sysctl.h> 2769 2770int 2771icmp6_sysctl(name, namelen, oldp, oldlenp, newp, newlen) 2772 int *name; 2773 u_int namelen; 2774 void *oldp; 2775 size_t *oldlenp; 2776 void *newp; 2777 size_t newlen; 2778{ 2779 2780 /* All sysctl names at this level are terminal. */ 2781 if (namelen != 1) 2782 return ENOTDIR; 2783 2784 switch (name[0]) { 2785 2786 case ICMPV6CTL_REDIRACCEPT: 2787 return sysctl_int(oldp, oldlenp, newp, newlen, 2788 &icmp6_rediraccept); 2789 case ICMPV6CTL_REDIRTIMEOUT: 2790 return sysctl_int(oldp, oldlenp, newp, newlen, 2791 &icmp6_redirtimeout); 2792 case ICMPV6CTL_STATS: 2793 return sysctl_rdstruct(oldp, oldlenp, newp, 2794 &icmp6stat, sizeof(icmp6stat)); 2795 case ICMPV6CTL_ND6_PRUNE: 2796 return sysctl_int(oldp, oldlenp, newp, newlen, &nd6_prune); 2797 case ICMPV6CTL_ND6_DELAY: 2798 return sysctl_int(oldp, oldlenp, newp, newlen, &nd6_delay); 2799 case ICMPV6CTL_ND6_UMAXTRIES: 2800 return sysctl_int(oldp, oldlenp, newp, newlen, &nd6_umaxtries); 2801 case ICMPV6CTL_ND6_MMAXTRIES: 2802 return sysctl_int(oldp, oldlenp, newp, newlen, &nd6_mmaxtries); 2803 case ICMPV6CTL_ND6_USELOOPBACK: 2804 return sysctl_int(oldp, oldlenp, newp, newlen, 2805 &nd6_useloopback); 2806 case ICMPV6CTL_NODEINFO: 2807 return sysctl_int(oldp, oldlenp, newp, newlen, &icmp6_nodeinfo); 2808 case ICMPV6CTL_ERRPPSLIMIT: 2809 return sysctl_int(oldp, oldlenp, newp, newlen, &icmp6errppslim); 2810 case ICMPV6CTL_ND6_MAXNUDHINT: 2811 return sysctl_int(oldp, oldlenp, newp, newlen, 2812 &nd6_maxnudhint); 2813 case ICMPV6CTL_MTUDISC_HIWAT: 2814 return sysctl_int(oldp, oldlenp, newp, newlen, 2815 &icmp6_mtudisc_hiwat); 2816 case ICMPV6CTL_MTUDISC_LOWAT: 2817 return sysctl_int(oldp, oldlenp, newp, newlen, 2818 &icmp6_mtudisc_lowat); 2819 default: 2820 return ENOPROTOOPT; 2821 } 2822 /* NOTREACHED */ 2823} 2824