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sys/netinet6/icmp6.c
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1 /* $NetBSD: icmp6.c,v 1.123.2.3 2008/10/03 09:04:30 jdc Exp $ */ 2 /* $KAME: icmp6.c,v 1.217 2001/06/20 15:03:29 jinmei 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. Neither the name of the University nor the names of its contributors 46 * may be used to endorse or promote products derived from this software 47 * without specific prior written permission. 48 * 49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 59 * SUCH DAMAGE. 60 * 61 * @(#)ip_icmp.c 8.2 (Berkeley) 1/4/94 62 */ 63 64 #include <sys/cdefs.h> 65 __KERNEL_RCSID(0, "$NetBSD: icmp6.c,v 1.123.2.3 2008/10/03 09:04:30 jdc Exp $"); 66 67 #include "opt_inet.h" 68 #include "opt_ipsec.h" 69 70 #include <sys/param.h> 71 #include <sys/systm.h> 72 #include <sys/malloc.h> 73 #include <sys/mbuf.h> 74 #include <sys/protosw.h> 75 #include <sys/socket.h> 76 #include <sys/socketvar.h> 77 #include <sys/time.h> 78 #include <sys/kernel.h> 79 #include <sys/syslog.h> 80 #include <sys/domain.h> 81 #include <sys/sysctl.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 #include <netinet6/scope6_var.h> 99 100 #ifdef IPSEC 101 #include <netinet6/ipsec.h> 102 #include <netkey/key.h> 103 #endif 104 105 #ifdef FAST_IPSEC 106 #include <netipsec/ipsec.h> 107 #include <netipsec/key.h> 108 #endif 109 110 111 #include "faith.h" 112 #if defined(NFAITH) && 0 < NFAITH 113 #include <net/if_faith.h> 114 #endif 115 116 #include <net/net_osdep.h> 117 118 extern struct domain inet6domain; 119 120 struct icmp6stat icmp6stat; 121 122 extern struct inpcbtable raw6cbtable; 123 extern int icmp6errppslim; 124 static int icmp6errpps_count = 0; 125 static struct timeval icmp6errppslim_last; 126 extern int icmp6_nodeinfo; 127 128 /* 129 * List of callbacks to notify when Path MTU changes are made. 130 */ 131 struct icmp6_mtudisc_callback { 132 LIST_ENTRY(icmp6_mtudisc_callback) mc_list; 133 void (*mc_func) __P((struct in6_addr *)); 134 }; 135 136 LIST_HEAD(, icmp6_mtudisc_callback) icmp6_mtudisc_callbacks = 137 LIST_HEAD_INITIALIZER(&icmp6_mtudisc_callbacks); 138 139 static struct rttimer_queue *icmp6_mtudisc_timeout_q = NULL; 140 extern int pmtu_expire; 141 142 /* XXX do these values make any sense? */ 143 static int icmp6_mtudisc_hiwat = 1280; 144 static int icmp6_mtudisc_lowat = 256; 145 146 /* 147 * keep track of # of redirect routes. 148 */ 149 static struct rttimer_queue *icmp6_redirect_timeout_q = NULL; 150 151 /* XXX experimental, turned off */ 152 static int icmp6_redirect_hiwat = -1; 153 static int icmp6_redirect_lowat = -1; 154 155 static void icmp6_errcount __P((struct icmp6errstat *, int, int)); 156 static int icmp6_rip6_input __P((struct mbuf **, int)); 157 static int icmp6_ratelimit __P((const struct in6_addr *, const int, const int)); 158 static const char *icmp6_redirect_diag __P((struct in6_addr *, 159 struct in6_addr *, struct in6_addr *)); 160 static struct mbuf *ni6_input __P((struct mbuf *, int)); 161 static struct mbuf *ni6_nametodns __P((const char *, int, int)); 162 static int ni6_dnsmatch __P((const char *, int, const char *, int)); 163 static int ni6_addrs __P((struct icmp6_nodeinfo *, struct mbuf *, 164 struct ifnet **, char *)); 165 static int ni6_store_addrs __P((struct icmp6_nodeinfo *, struct icmp6_nodeinfo *, 166 struct ifnet *, int)); 167 static int icmp6_notify_error __P((struct mbuf *, int, int, int)); 168 static struct rtentry *icmp6_mtudisc_clone __P((struct sockaddr *)); 169 static void icmp6_mtudisc_timeout __P((struct rtentry *, struct rttimer *)); 170 static void icmp6_redirect_timeout __P((struct rtentry *, struct rttimer *)); 171 172 173 void 174 icmp6_init() 175 { 176 mld_init(); 177 icmp6_mtudisc_timeout_q = rt_timer_queue_create(pmtu_expire); 178 icmp6_redirect_timeout_q = rt_timer_queue_create(icmp6_redirtimeout); 179 } 180 181 static void 182 icmp6_errcount(stat, type, code) 183 struct icmp6errstat *stat; 184 int type, code; 185 { 186 switch (type) { 187 case ICMP6_DST_UNREACH: 188 switch (code) { 189 case ICMP6_DST_UNREACH_NOROUTE: 190 stat->icp6errs_dst_unreach_noroute++; 191 return; 192 case ICMP6_DST_UNREACH_ADMIN: 193 stat->icp6errs_dst_unreach_admin++; 194 return; 195 case ICMP6_DST_UNREACH_BEYONDSCOPE: 196 stat->icp6errs_dst_unreach_beyondscope++; 197 return; 198 case ICMP6_DST_UNREACH_ADDR: 199 stat->icp6errs_dst_unreach_addr++; 200 return; 201 case ICMP6_DST_UNREACH_NOPORT: 202 stat->icp6errs_dst_unreach_noport++; 203 return; 204 } 205 break; 206 case ICMP6_PACKET_TOO_BIG: 207 stat->icp6errs_packet_too_big++; 208 return; 209 case ICMP6_TIME_EXCEEDED: 210 switch (code) { 211 case ICMP6_TIME_EXCEED_TRANSIT: 212 stat->icp6errs_time_exceed_transit++; 213 return; 214 case ICMP6_TIME_EXCEED_REASSEMBLY: 215 stat->icp6errs_time_exceed_reassembly++; 216 return; 217 } 218 break; 219 case ICMP6_PARAM_PROB: 220 switch (code) { 221 case ICMP6_PARAMPROB_HEADER: 222 stat->icp6errs_paramprob_header++; 223 return; 224 case ICMP6_PARAMPROB_NEXTHEADER: 225 stat->icp6errs_paramprob_nextheader++; 226 return; 227 case ICMP6_PARAMPROB_OPTION: 228 stat->icp6errs_paramprob_option++; 229 return; 230 } 231 break; 232 case ND_REDIRECT: 233 stat->icp6errs_redirect++; 234 return; 235 } 236 stat->icp6errs_unknown++; 237 } 238 239 /* 240 * Register a Path MTU Discovery callback. 241 */ 242 void 243 icmp6_mtudisc_callback_register(func) 244 void (*func) __P((struct in6_addr *)); 245 { 246 struct icmp6_mtudisc_callback *mc; 247 248 for (mc = LIST_FIRST(&icmp6_mtudisc_callbacks); mc != NULL; 249 mc = LIST_NEXT(mc, mc_list)) { 250 if (mc->mc_func == func) 251 return; 252 } 253 254 mc = malloc(sizeof(*mc), M_PCB, M_NOWAIT); 255 if (mc == NULL) 256 panic("icmp6_mtudisc_callback_register"); 257 258 mc->mc_func = func; 259 LIST_INSERT_HEAD(&icmp6_mtudisc_callbacks, mc, mc_list); 260 } 261 262 /* 263 * A wrapper function for icmp6_error() necessary when the erroneous packet 264 * may not contain enough scope zone information. 265 */ 266 void 267 icmp6_error2(m, type, code, param, ifp) 268 struct mbuf *m; 269 int type, code, param; 270 struct ifnet *ifp; 271 { 272 struct ip6_hdr *ip6; 273 274 if (ifp == NULL) 275 return; 276 277 if (m->m_len < sizeof(struct ip6_hdr)) { 278 m = m_pullup(m, sizeof(struct ip6_hdr)); 279 if (m == NULL) 280 return; 281 } 282 283 ip6 = mtod(m, struct ip6_hdr *); 284 285 if (in6_setscope(&ip6->ip6_src, ifp, NULL) != 0) 286 return; 287 if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0) 288 return; 289 290 icmp6_error(m, type, code, param); 291 } 292 293 /* 294 * Generate an error packet of type error in response to bad IP6 packet. 295 */ 296 void 297 icmp6_error(m, type, code, param) 298 struct mbuf *m; 299 int type, code, param; 300 { 301 struct ip6_hdr *oip6, *nip6; 302 struct icmp6_hdr *icmp6; 303 u_int preplen; 304 int off; 305 int nxt; 306 307 icmp6stat.icp6s_error++; 308 309 /* count per-type-code statistics */ 310 icmp6_errcount(&icmp6stat.icp6s_outerrhist, type, code); 311 312 if (m->m_flags & M_DECRYPTED) { 313 icmp6stat.icp6s_canterror++; 314 goto freeit; 315 } 316 317 if (m->m_len < sizeof(struct ip6_hdr)) { 318 m = m_pullup(m, sizeof(struct ip6_hdr)); 319 if (m == NULL) 320 return; 321 } 322 oip6 = mtod(m, struct ip6_hdr *); 323 324 /* 325 * If the destination address of the erroneous packet is a multicast 326 * address, or the packet was sent using link-layer multicast, 327 * we should basically suppress sending an error (RFC 2463, Section 328 * 2.4). 329 * We have two exceptions (the item e.2 in that section): 330 * - the Pakcet Too Big message can be sent for path MTU discovery. 331 * - the Parameter Problem Message that can be allowed an icmp6 error 332 * in the option type field. This check has been done in 333 * ip6_unknown_opt(), so we can just check the type and code. 334 */ 335 if ((m->m_flags & (M_BCAST|M_MCAST) || 336 IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) && 337 (type != ICMP6_PACKET_TOO_BIG && 338 (type != ICMP6_PARAM_PROB || 339 code != ICMP6_PARAMPROB_OPTION))) 340 goto freeit; 341 342 /* 343 * RFC 2463, 2.4 (e.5): source address check. 344 * XXX: the case of anycast source? 345 */ 346 if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) || 347 IN6_IS_ADDR_MULTICAST(&oip6->ip6_src)) 348 goto freeit; 349 350 /* 351 * If we are about to send ICMPv6 against ICMPv6 error/redirect, 352 * don't do it. 353 */ 354 nxt = -1; 355 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 356 if (off >= 0 && nxt == IPPROTO_ICMPV6) { 357 struct icmp6_hdr *icp; 358 359 IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off, 360 sizeof(*icp)); 361 if (icp == NULL) { 362 icmp6stat.icp6s_tooshort++; 363 return; 364 } 365 if (icp->icmp6_type < ICMP6_ECHO_REQUEST || 366 icp->icmp6_type == ND_REDIRECT) { 367 /* 368 * ICMPv6 error 369 * Special case: for redirect (which is 370 * informational) we must not send icmp6 error. 371 */ 372 icmp6stat.icp6s_canterror++; 373 goto freeit; 374 } else { 375 /* ICMPv6 informational - send the error */ 376 } 377 } 378 #if 0 /* controversial */ 379 else if (off >= 0 && nxt == IPPROTO_ESP) { 380 /* 381 * It could be ICMPv6 error inside ESP. Take a safer side, 382 * don't respond. 383 */ 384 icmp6stat.icp6s_canterror++; 385 goto freeit; 386 } 387 #endif 388 else { 389 /* non-ICMPv6 - send the error */ 390 } 391 392 oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */ 393 394 /* Finally, do rate limitation check. */ 395 if (icmp6_ratelimit(&oip6->ip6_src, type, code)) { 396 icmp6stat.icp6s_toofreq++; 397 goto freeit; 398 } 399 400 /* 401 * OK, ICMP6 can be generated. 402 */ 403 404 if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN) 405 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len); 406 407 preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 408 M_PREPEND(m, preplen, M_DONTWAIT); 409 if (m && m->m_len < preplen) 410 m = m_pullup(m, preplen); 411 if (m == NULL) { 412 nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__)); 413 return; 414 } 415 416 nip6 = mtod(m, struct ip6_hdr *); 417 nip6->ip6_src = oip6->ip6_src; 418 nip6->ip6_dst = oip6->ip6_dst; 419 420 in6_clearscope(&oip6->ip6_src); 421 in6_clearscope(&oip6->ip6_dst); 422 423 icmp6 = (struct icmp6_hdr *)(nip6 + 1); 424 icmp6->icmp6_type = type; 425 icmp6->icmp6_code = code; 426 icmp6->icmp6_pptr = htonl((u_int32_t)param); 427 428 /* 429 * icmp6_reflect() is designed to be in the input path. 430 * icmp6_error() can be called from both input and output path, 431 * and if we are in output path rcvif could contain bogus value. 432 * clear m->m_pkthdr.rcvif for safety, we should have enough scope 433 * information in ip header (nip6). 434 */ 435 m->m_pkthdr.rcvif = NULL; 436 437 icmp6stat.icp6s_outhist[type]++; 438 icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */ 439 440 return; 441 442 freeit: 443 /* 444 * If we can't tell whether or not we can generate ICMP6, free it. 445 */ 446 m_freem(m); 447 } 448 449 /* 450 * Process a received ICMP6 message. 451 */ 452 int 453 icmp6_input(struct mbuf **mp, int *offp, int proto) 454 { 455 struct mbuf *m = *mp, *n; 456 struct ip6_hdr *ip6, *nip6; 457 struct icmp6_hdr *icmp6, *nicmp6; 458 int off = *offp; 459 int icmp6len = m->m_pkthdr.len - *offp; 460 int code, sum, noff; 461 462 #define ICMP6_MAXLEN (sizeof(*nip6) + sizeof(*nicmp6) + 4) 463 KASSERT(ICMP6_MAXLEN < MCLBYTES); 464 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_msg); 465 466 /* 467 * Locate icmp6 structure in mbuf, and check 468 * that not corrupted and of at least minimum length 469 */ 470 471 ip6 = mtod(m, struct ip6_hdr *); 472 if (icmp6len < sizeof(struct icmp6_hdr)) { 473 icmp6stat.icp6s_tooshort++; 474 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error); 475 goto freeit; 476 } 477 478 /* 479 * calculate the checksum 480 */ 481 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 482 if (icmp6 == NULL) { 483 icmp6stat.icp6s_tooshort++; 484 /* m is invalid */ 485 /*icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error);*/ 486 return IPPROTO_DONE; 487 } 488 KASSERT(IP6_HDR_ALIGNED_P(icmp6)); 489 code = icmp6->icmp6_code; 490 491 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) { 492 nd6log((LOG_ERR, 493 "ICMP6 checksum error(%d|%x) %s\n", 494 icmp6->icmp6_type, sum, ip6_sprintf(&ip6->ip6_src))); 495 icmp6stat.icp6s_checksum++; 496 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error); 497 goto freeit; 498 } 499 500 #if defined(NFAITH) && 0 < NFAITH 501 if (faithprefix(&ip6->ip6_dst)) { 502 /* 503 * Deliver very specific ICMP6 type only. 504 * This is important to deliver TOOBIG. Otherwise PMTUD 505 * will not work. 506 */ 507 switch (icmp6->icmp6_type) { 508 case ICMP6_DST_UNREACH: 509 case ICMP6_PACKET_TOO_BIG: 510 case ICMP6_TIME_EXCEEDED: 511 break; 512 default: 513 goto freeit; 514 } 515 } 516 #endif 517 518 icmp6stat.icp6s_inhist[icmp6->icmp6_type]++; 519 520 switch (icmp6->icmp6_type) { 521 case ICMP6_DST_UNREACH: 522 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_dstunreach); 523 switch (code) { 524 case ICMP6_DST_UNREACH_NOROUTE: 525 code = PRC_UNREACH_NET; 526 break; 527 case ICMP6_DST_UNREACH_ADMIN: 528 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_adminprohib); 529 code = PRC_UNREACH_PROTOCOL; /* is this a good code? */ 530 break; 531 case ICMP6_DST_UNREACH_ADDR: 532 code = PRC_HOSTDEAD; 533 break; 534 #ifdef COMPAT_RFC1885 535 case ICMP6_DST_UNREACH_NOTNEIGHBOR: 536 code = PRC_UNREACH_SRCFAIL; 537 break; 538 #else 539 case ICMP6_DST_UNREACH_BEYONDSCOPE: 540 /* I mean "source address was incorrect." */ 541 code = PRC_UNREACH_NET; 542 break; 543 #endif 544 case ICMP6_DST_UNREACH_NOPORT: 545 code = PRC_UNREACH_PORT; 546 break; 547 default: 548 goto badcode; 549 } 550 goto deliver; 551 552 case ICMP6_PACKET_TOO_BIG: 553 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_pkttoobig); 554 555 /* 556 * MTU is checked in icmp6_mtudisc. 557 */ 558 code = PRC_MSGSIZE; 559 560 /* 561 * Updating the path MTU will be done after examining 562 * intermediate extension headers. 563 */ 564 goto deliver; 565 566 case ICMP6_TIME_EXCEEDED: 567 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_timeexceed); 568 switch (code) { 569 case ICMP6_TIME_EXCEED_TRANSIT: 570 code = PRC_TIMXCEED_INTRANS; 571 break; 572 case ICMP6_TIME_EXCEED_REASSEMBLY: 573 code = PRC_TIMXCEED_REASS; 574 break; 575 default: 576 goto badcode; 577 } 578 goto deliver; 579 580 case ICMP6_PARAM_PROB: 581 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_paramprob); 582 switch (code) { 583 case ICMP6_PARAMPROB_NEXTHEADER: 584 code = PRC_UNREACH_PROTOCOL; 585 break; 586 case ICMP6_PARAMPROB_HEADER: 587 case ICMP6_PARAMPROB_OPTION: 588 code = PRC_PARAMPROB; 589 break; 590 default: 591 goto badcode; 592 } 593 goto deliver; 594 595 case ICMP6_ECHO_REQUEST: 596 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echo); 597 if (code != 0) 598 goto badcode; 599 /* 600 * Copy mbuf to send to two data paths: userland socket(s), 601 * and to the querier (echo reply). 602 * m: a copy for socket, n: a copy for querier 603 * 604 * If the first mbuf is shared, or the first mbuf is too short, 605 * copy the first part of the data into a fresh mbuf. 606 * Otherwise, we will wrongly overwrite both copies. 607 */ 608 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 609 /* Give up local */ 610 n = m; 611 m = NULL; 612 } else if (M_READONLY(n) || 613 n->m_len < off + sizeof(struct icmp6_hdr)) { 614 struct mbuf *n0 = n; 615 616 /* 617 * Prepare an internal mbuf. m_pullup() doesn't 618 * always copy the length we specified. 619 */ 620 if ((n = m_dup(n0, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 621 /* Give up local */ 622 n = m; 623 m = NULL; 624 } 625 m_freem(n0); 626 } 627 IP6_EXTHDR_GET(nicmp6,struct icmp6_hdr *, n, off, sizeof(*nicmp6)); 628 nicmp6->icmp6_type = ICMP6_ECHO_REPLY; 629 nicmp6->icmp6_code = 0; 630 if (n) { 631 icmp6stat.icp6s_reflect++; 632 icmp6stat.icp6s_outhist[ICMP6_ECHO_REPLY]++; 633 icmp6_reflect(n, off); 634 } 635 if (!m) 636 goto freeit; 637 break; 638 639 case ICMP6_ECHO_REPLY: 640 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echoreply); 641 if (code != 0) 642 goto badcode; 643 break; 644 645 case MLD_LISTENER_QUERY: 646 case MLD_LISTENER_REPORT: 647 if (icmp6len < sizeof(struct mld_hdr)) 648 goto badlen; 649 if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */ 650 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldquery); 651 else 652 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldreport); 653 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 654 /* give up local */ 655 mld_input(m, off); 656 m = NULL; 657 goto freeit; 658 } 659 mld_input(n, off); 660 /* m stays. */ 661 break; 662 663 case MLD_LISTENER_DONE: 664 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mlddone); 665 if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */ 666 goto badlen; 667 break; /* nothing to be done in kernel */ 668 669 case MLD_MTRACE_RESP: 670 case MLD_MTRACE: 671 /* XXX: these two are experimental. not officially defined. */ 672 /* XXX: per-interface statistics? */ 673 break; /* just pass it to applications */ 674 675 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */ 676 { 677 enum { WRU, FQDN } mode; 678 679 if (!icmp6_nodeinfo) 680 break; 681 682 if (icmp6len == sizeof(struct icmp6_hdr) + 4) 683 mode = WRU; 684 else if (icmp6len >= sizeof(struct icmp6_nodeinfo)) 685 mode = FQDN; 686 else 687 goto badlen; 688 689 if (mode == FQDN) { 690 n = m_copym(m, 0, M_COPYALL, M_DONTWAIT); 691 if (n) 692 n = ni6_input(n, off); 693 /* XXX meaningless if n == NULL */ 694 noff = sizeof(struct ip6_hdr); 695 } else { 696 u_char *p; 697 int maxhlen; 698 699 if ((icmp6_nodeinfo & 5) != 5) 700 break; 701 702 if (code != 0) 703 goto badcode; 704 MGETHDR(n, M_DONTWAIT, m->m_type); 705 if (n && ICMP6_MAXLEN > MHLEN) { 706 MCLGET(n, M_DONTWAIT); 707 if ((n->m_flags & M_EXT) == 0) { 708 m_free(n); 709 n = NULL; 710 } 711 } 712 if (n == NULL) { 713 /* Give up remote */ 714 break; 715 } 716 n->m_pkthdr.rcvif = NULL; 717 n->m_len = 0; 718 maxhlen = M_TRAILINGSPACE(n) - ICMP6_MAXLEN; 719 if (maxhlen > hostnamelen) 720 maxhlen = hostnamelen; 721 /* 722 * Copy IPv6 and ICMPv6 only. 723 */ 724 nip6 = mtod(n, struct ip6_hdr *); 725 bcopy(ip6, nip6, sizeof(struct ip6_hdr)); 726 nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 727 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); 728 p = (u_char *)(nicmp6 + 1); 729 bzero(p, 4); 730 bcopy(hostname, p + 4, maxhlen); /* meaningless TTL */ 731 noff = sizeof(struct ip6_hdr); 732 M_COPY_PKTHDR(n, m); /* just for rcvif */ 733 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 734 sizeof(struct icmp6_hdr) + 4 + maxhlen; 735 nicmp6->icmp6_type = ICMP6_WRUREPLY; 736 nicmp6->icmp6_code = 0; 737 } 738 #undef hostnamelen 739 if (n) { 740 icmp6stat.icp6s_reflect++; 741 icmp6stat.icp6s_outhist[ICMP6_WRUREPLY]++; 742 icmp6_reflect(n, noff); 743 } 744 break; 745 } 746 747 case ICMP6_WRUREPLY: 748 if (code != 0) 749 goto badcode; 750 break; 751 752 case ND_ROUTER_SOLICIT: 753 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routersolicit); 754 if (code != 0) 755 goto badcode; 756 if (icmp6len < sizeof(struct nd_router_solicit)) 757 goto badlen; 758 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 759 /* give up local */ 760 nd6_rs_input(m, off, icmp6len); 761 m = NULL; 762 goto freeit; 763 } 764 nd6_rs_input(n, off, icmp6len); 765 /* m stays. */ 766 break; 767 768 case ND_ROUTER_ADVERT: 769 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routeradvert); 770 if (code != 0) 771 goto badcode; 772 if (icmp6len < sizeof(struct nd_router_advert)) 773 goto badlen; 774 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 775 /* give up local */ 776 nd6_ra_input(m, off, icmp6len); 777 m = NULL; 778 goto freeit; 779 } 780 nd6_ra_input(n, off, icmp6len); 781 /* m stays. */ 782 break; 783 784 case ND_NEIGHBOR_SOLICIT: 785 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighborsolicit); 786 if (code != 0) 787 goto badcode; 788 if (icmp6len < sizeof(struct nd_neighbor_solicit)) 789 goto badlen; 790 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 791 /* give up local */ 792 nd6_ns_input(m, off, icmp6len); 793 m = NULL; 794 goto freeit; 795 } 796 nd6_ns_input(n, off, icmp6len); 797 /* m stays. */ 798 break; 799 800 case ND_NEIGHBOR_ADVERT: 801 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighboradvert); 802 if (code != 0) 803 goto badcode; 804 if (icmp6len < sizeof(struct nd_neighbor_advert)) 805 goto badlen; 806 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 807 /* give up local */ 808 nd6_na_input(m, off, icmp6len); 809 m = NULL; 810 goto freeit; 811 } 812 nd6_na_input(n, off, icmp6len); 813 /* m stays. */ 814 break; 815 816 case ND_REDIRECT: 817 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_redirect); 818 if (code != 0) 819 goto badcode; 820 if (icmp6len < sizeof(struct nd_redirect)) 821 goto badlen; 822 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 823 /* give up local */ 824 icmp6_redirect_input(m, off); 825 m = NULL; 826 goto freeit; 827 } 828 icmp6_redirect_input(n, off); 829 /* m stays. */ 830 break; 831 832 case ICMP6_ROUTER_RENUMBERING: 833 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND && 834 code != ICMP6_ROUTER_RENUMBERING_RESULT) 835 goto badcode; 836 if (icmp6len < sizeof(struct icmp6_router_renum)) 837 goto badlen; 838 break; 839 840 default: 841 nd6log((LOG_DEBUG, 842 "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n", 843 icmp6->icmp6_type, ip6_sprintf(&ip6->ip6_src), 844 ip6_sprintf(&ip6->ip6_dst), 845 m->m_pkthdr.rcvif ? m->m_pkthdr.rcvif->if_index : 0)); 846 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) { 847 /* ICMPv6 error: MUST deliver it by spec... */ 848 code = PRC_NCMDS; 849 /* deliver */ 850 } else { 851 /* ICMPv6 informational: MUST not deliver */ 852 break; 853 } 854 deliver: 855 if (icmp6_notify_error(m, off, icmp6len, code)) { 856 /* In this case, m should've been freed. */ 857 return (IPPROTO_DONE); 858 } 859 break; 860 861 badcode: 862 icmp6stat.icp6s_badcode++; 863 break; 864 865 badlen: 866 icmp6stat.icp6s_badlen++; 867 break; 868 } 869 870 /* deliver the packet to appropriate sockets */ 871 icmp6_rip6_input(&m, *offp); 872 873 return IPPROTO_DONE; 874 875 freeit: 876 m_freem(m); 877 return IPPROTO_DONE; 878 } 879 880 static int 881 icmp6_notify_error(m, off, icmp6len, code) 882 struct mbuf *m; 883 int off, icmp6len, code; 884 { 885 struct icmp6_hdr *icmp6; 886 struct ip6_hdr *eip6; 887 u_int32_t notifymtu; 888 struct sockaddr_in6 icmp6src, icmp6dst; 889 890 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) { 891 icmp6stat.icp6s_tooshort++; 892 goto freeit; 893 } 894 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 895 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 896 if (icmp6 == NULL) { 897 icmp6stat.icp6s_tooshort++; 898 return (-1); 899 } 900 eip6 = (struct ip6_hdr *)(icmp6 + 1); 901 902 /* Detect the upper level protocol */ 903 { 904 void (*ctlfunc) __P((int, struct sockaddr *, void *)); 905 u_int8_t nxt = eip6->ip6_nxt; 906 int eoff = off + sizeof(struct icmp6_hdr) + 907 sizeof(struct ip6_hdr); 908 struct ip6ctlparam ip6cp; 909 struct in6_addr *finaldst = NULL; 910 int icmp6type = icmp6->icmp6_type; 911 struct ip6_frag *fh; 912 struct ip6_rthdr *rth; 913 struct ip6_rthdr0 *rth0; 914 int rthlen; 915 916 while (1) { /* XXX: should avoid infinite loop explicitly? */ 917 struct ip6_ext *eh; 918 919 switch (nxt) { 920 case IPPROTO_HOPOPTS: 921 case IPPROTO_DSTOPTS: 922 case IPPROTO_AH: 923 IP6_EXTHDR_GET(eh, struct ip6_ext *, m, 924 eoff, sizeof(*eh)); 925 if (eh == NULL) { 926 icmp6stat.icp6s_tooshort++; 927 return (-1); 928 } 929 930 if (nxt == IPPROTO_AH) 931 eoff += (eh->ip6e_len + 2) << 2; 932 else 933 eoff += (eh->ip6e_len + 1) << 3; 934 nxt = eh->ip6e_nxt; 935 break; 936 case IPPROTO_ROUTING: 937 /* 938 * When the erroneous packet contains a 939 * routing header, we should examine the 940 * header to determine the final destination. 941 * Otherwise, we can't properly update 942 * information that depends on the final 943 * destination (e.g. path MTU). 944 */ 945 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m, 946 eoff, sizeof(*rth)); 947 if (rth == NULL) { 948 icmp6stat.icp6s_tooshort++; 949 return (-1); 950 } 951 rthlen = (rth->ip6r_len + 1) << 3; 952 /* 953 * XXX: currently there is no 954 * officially defined type other 955 * than type-0. 956 * Note that if the segment left field 957 * is 0, all intermediate hops must 958 * have been passed. 959 */ 960 if (rth->ip6r_segleft && 961 rth->ip6r_type == IPV6_RTHDR_TYPE_0) { 962 int hops; 963 964 IP6_EXTHDR_GET(rth0, 965 struct ip6_rthdr0 *, m, 966 eoff, rthlen); 967 if (rth0 == NULL) { 968 icmp6stat.icp6s_tooshort++; 969 return (-1); 970 } 971 /* just ignore a bogus header */ 972 if ((rth0->ip6r0_len % 2) == 0 && 973 (hops = rth0->ip6r0_len/2)) 974 finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1); 975 } 976 eoff += rthlen; 977 nxt = rth->ip6r_nxt; 978 break; 979 case IPPROTO_FRAGMENT: 980 IP6_EXTHDR_GET(fh, struct ip6_frag *, m, 981 eoff, sizeof(*fh)); 982 if (fh == NULL) { 983 icmp6stat.icp6s_tooshort++; 984 return (-1); 985 } 986 /* 987 * Data after a fragment header is meaningless 988 * unless it is the first fragment, but 989 * we'll go to the notify label for path MTU 990 * discovery. 991 */ 992 if (fh->ip6f_offlg & IP6F_OFF_MASK) 993 goto notify; 994 995 eoff += sizeof(struct ip6_frag); 996 nxt = fh->ip6f_nxt; 997 break; 998 default: 999 /* 1000 * This case includes ESP and the No Next 1001 * Header. In such cases going to the notify 1002 * label does not have any meaning 1003 * (i.e. ctlfunc will be NULL), but we go 1004 * anyway since we might have to update 1005 * path MTU information. 1006 */ 1007 goto notify; 1008 } 1009 } 1010 notify: 1011 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 1012 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 1013 if (icmp6 == NULL) { 1014 icmp6stat.icp6s_tooshort++; 1015 return (-1); 1016 } 1017 1018 /* 1019 * retrieve parameters from the inner IPv6 header, and convert 1020 * them into sockaddr structures. 1021 * XXX: there is no guarantee that the source or destination 1022 * addresses of the inner packet are in the same scope zone as 1023 * the addresses of the icmp packet. But there is no other 1024 * way to determine the zone. 1025 */ 1026 eip6 = (struct ip6_hdr *)(icmp6 + 1); 1027 1028 bzero(&icmp6dst, sizeof(icmp6dst)); 1029 icmp6dst.sin6_len = sizeof(struct sockaddr_in6); 1030 icmp6dst.sin6_family = AF_INET6; 1031 if (finaldst == NULL) 1032 icmp6dst.sin6_addr = eip6->ip6_dst; 1033 else 1034 icmp6dst.sin6_addr = *finaldst; 1035 if (in6_setscope(&icmp6dst.sin6_addr, m->m_pkthdr.rcvif, NULL)) 1036 goto freeit; 1037 bzero(&icmp6src, sizeof(icmp6src)); 1038 icmp6src.sin6_len = sizeof(struct sockaddr_in6); 1039 icmp6src.sin6_family = AF_INET6; 1040 icmp6src.sin6_addr = eip6->ip6_src; 1041 if (in6_setscope(&icmp6src.sin6_addr, m->m_pkthdr.rcvif, NULL)) 1042 goto freeit; 1043 icmp6src.sin6_flowinfo = 1044 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK); 1045 1046 if (finaldst == NULL) 1047 finaldst = &eip6->ip6_dst; 1048 ip6cp.ip6c_m = m; 1049 ip6cp.ip6c_icmp6 = icmp6; 1050 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1); 1051 ip6cp.ip6c_off = eoff; 1052 ip6cp.ip6c_finaldst = finaldst; 1053 ip6cp.ip6c_src = &icmp6src; 1054 ip6cp.ip6c_nxt = nxt; 1055 1056 if (icmp6type == ICMP6_PACKET_TOO_BIG) { 1057 notifymtu = ntohl(icmp6->icmp6_mtu); 1058 ip6cp.ip6c_cmdarg = (void *)¬ifymtu; 1059 } 1060 1061 ctlfunc = (void (*) __P((int, struct sockaddr *, void *))) 1062 (inet6sw[ip6_protox[nxt]].pr_ctlinput); 1063 if (ctlfunc) { 1064 (void) (*ctlfunc)(code, (struct sockaddr *)&icmp6dst, 1065 &ip6cp); 1066 } 1067 } 1068 return (0); 1069 1070 freeit: 1071 m_freem(m); 1072 return (-1); 1073 } 1074 1075 void 1076 icmp6_mtudisc_update(ip6cp, validated) 1077 struct ip6ctlparam *ip6cp; 1078 int validated; 1079 { 1080 unsigned long rtcount; 1081 struct icmp6_mtudisc_callback *mc; 1082 struct in6_addr *dst = ip6cp->ip6c_finaldst; 1083 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6; 1084 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */ 1085 u_int mtu = ntohl(icmp6->icmp6_mtu); 1086 struct rtentry *rt = NULL; 1087 struct sockaddr_in6 sin6; 1088 1089 /* 1090 * The MTU should not be less than the minimal IPv6 MTU except for the 1091 * hack in ip6_output/ip6_setpmtu where we always include a frag header. 1092 * In that one case, the MTU might be less than 1280. 1093 */ 1094 if (__predict_false(mtu < IPV6_MMTU - sizeof(struct ip6_frag))) { 1095 /* is the mtu even sane? */ 1096 if (mtu < sizeof(struct ip6_hdr) + sizeof(struct ip6_frag) + 8) 1097 return; 1098 if (!validated) 1099 return; 1100 mtu = IPV6_MMTU - sizeof(struct ip6_frag); 1101 } 1102 1103 /* 1104 * allow non-validated cases if memory is plenty, to make traffic 1105 * from non-connected pcb happy. 1106 */ 1107 rtcount = rt_timer_count(icmp6_mtudisc_timeout_q); 1108 if (validated) { 1109 if (0 <= icmp6_mtudisc_hiwat && rtcount > icmp6_mtudisc_hiwat) 1110 return; 1111 else if (0 <= icmp6_mtudisc_lowat && 1112 rtcount > icmp6_mtudisc_lowat) { 1113 /* 1114 * XXX nuke a victim, install the new one. 1115 */ 1116 } 1117 } else { 1118 if (0 <= icmp6_mtudisc_lowat && rtcount > icmp6_mtudisc_lowat) 1119 return; 1120 } 1121 1122 bzero(&sin6, sizeof(sin6)); 1123 sin6.sin6_family = PF_INET6; 1124 sin6.sin6_len = sizeof(struct sockaddr_in6); 1125 sin6.sin6_addr = *dst; 1126 if (in6_setscope(&sin6.sin6_addr, m->m_pkthdr.rcvif, NULL)) 1127 return; 1128 1129 rt = icmp6_mtudisc_clone((struct sockaddr *)&sin6); 1130 1131 if (rt && (rt->rt_flags & RTF_HOST) && 1132 !(rt->rt_rmx.rmx_locks & RTV_MTU) && 1133 (rt->rt_rmx.rmx_mtu > mtu || rt->rt_rmx.rmx_mtu == 0)) { 1134 if (mtu < IN6_LINKMTU(rt->rt_ifp)) { 1135 icmp6stat.icp6s_pmtuchg++; 1136 rt->rt_rmx.rmx_mtu = mtu; 1137 } 1138 } 1139 if (rt) { /* XXX: need braces to avoid conflict with else in RTFREE. */ 1140 RTFREE(rt); 1141 } 1142 1143 /* 1144 * Notify protocols that the MTU for this destination 1145 * has changed. 1146 */ 1147 for (mc = LIST_FIRST(&icmp6_mtudisc_callbacks); mc != NULL; 1148 mc = LIST_NEXT(mc, mc_list)) 1149 (*mc->mc_func)(&sin6.sin6_addr); 1150 } 1151 1152 /* 1153 * Process a Node Information Query packet, based on 1154 * draft-ietf-ipngwg-icmp-name-lookups-07. 1155 * 1156 * Spec incompatibilities: 1157 * - IPv6 Subject address handling 1158 * - IPv4 Subject address handling support missing 1159 * - Proxy reply (answer even if it's not for me) 1160 * - joins NI group address at in6_ifattach() time only, does not cope 1161 * with hostname changes by sethostname(3) 1162 */ 1163 #ifndef offsetof /* XXX */ 1164 #define offsetof(type, member) ((size_t)(&((type *)0)->member)) 1165 #endif 1166 static struct mbuf * 1167 ni6_input(m, off) 1168 struct mbuf *m; 1169 int off; 1170 { 1171 struct icmp6_nodeinfo *ni6, *nni6; 1172 struct mbuf *n = NULL; 1173 u_int16_t qtype; 1174 int subjlen; 1175 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1176 struct ni_reply_fqdn *fqdn; 1177 int addrs; /* for NI_QTYPE_NODEADDR */ 1178 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */ 1179 struct sockaddr_in6 sin6; /* ip6_dst */ 1180 struct in6_addr in6_subj; /* subject address */ 1181 struct ip6_hdr *ip6; 1182 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */ 1183 char *subj = NULL; 1184 1185 ip6 = mtod(m, struct ip6_hdr *); 1186 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6)); 1187 if (ni6 == NULL) { 1188 /* m is already reclaimed */ 1189 return NULL; 1190 } 1191 1192 /* 1193 * Validate IPv6 destination address. 1194 * 1195 * The Responder must discard the Query without further processing 1196 * unless it is one of the Responder's unicast or anycast addresses, or 1197 * a link-local scope multicast address which the Responder has joined. 1198 * [icmp-name-lookups-07, Section 4.] 1199 */ 1200 bzero(&sin6, sizeof(sin6)); 1201 sin6.sin6_family = AF_INET6; 1202 sin6.sin6_len = sizeof(struct sockaddr_in6); 1203 bcopy(&ip6->ip6_dst, &sin6.sin6_addr, sizeof(sin6.sin6_addr)); 1204 /* XXX scopeid */ 1205 if (ifa_ifwithaddr((struct sockaddr *)&sin6)) 1206 ; /* unicast/anycast, fine */ 1207 else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr)) 1208 ; /* link-local multicast, fine */ 1209 else 1210 goto bad; 1211 1212 /* validate query Subject field. */ 1213 qtype = ntohs(ni6->ni_qtype); 1214 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo); 1215 switch (qtype) { 1216 case NI_QTYPE_NOOP: 1217 case NI_QTYPE_SUPTYPES: 1218 /* 07 draft */ 1219 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0) 1220 break; 1221 /* FALLTHROUGH */ 1222 case NI_QTYPE_FQDN: 1223 case NI_QTYPE_NODEADDR: 1224 case NI_QTYPE_IPV4ADDR: 1225 switch (ni6->ni_code) { 1226 case ICMP6_NI_SUBJ_IPV6: 1227 #if ICMP6_NI_SUBJ_IPV6 != 0 1228 case 0: 1229 #endif 1230 /* 1231 * backward compatibility - try to accept 03 draft 1232 * format, where no Subject is present. 1233 */ 1234 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 && 1235 subjlen == 0) { 1236 oldfqdn++; 1237 break; 1238 } 1239 #if ICMP6_NI_SUBJ_IPV6 != 0 1240 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6) 1241 goto bad; 1242 #endif 1243 1244 if (subjlen != sizeof(sin6.sin6_addr)) 1245 goto bad; 1246 1247 /* 1248 * Validate Subject address. 1249 * 1250 * Not sure what exactly "address belongs to the node" 1251 * means in the spec, is it just unicast, or what? 1252 * 1253 * At this moment we consider Subject address as 1254 * "belong to the node" if the Subject address equals 1255 * to the IPv6 destination address; validation for 1256 * IPv6 destination address should have done enough 1257 * check for us. 1258 * 1259 * We do not do proxy at this moment. 1260 */ 1261 /* m_pulldown instead of copy? */ 1262 m_copydata(m, off + sizeof(struct icmp6_nodeinfo), 1263 subjlen, (caddr_t)&in6_subj); 1264 if (in6_setscope(&in6_subj, m->m_pkthdr.rcvif, NULL)) 1265 goto bad; 1266 1267 subj = (char *)&in6_subj; 1268 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &in6_subj)) 1269 break; 1270 1271 /* 1272 * XXX if we are to allow other cases, we should really 1273 * be careful about scope here. 1274 * basically, we should disallow queries toward IPv6 1275 * destination X with subject Y, if scope(X) > scope(Y). 1276 * if we allow scope(X) > scope(Y), it will result in 1277 * information leakage across scope boundary. 1278 */ 1279 goto bad; 1280 1281 case ICMP6_NI_SUBJ_FQDN: 1282 /* 1283 * Validate Subject name with gethostname(3). 1284 * 1285 * The behavior may need some debate, since: 1286 * - we are not sure if the node has FQDN as 1287 * hostname (returned by gethostname(3)). 1288 * - the code does wildcard match for truncated names. 1289 * however, we are not sure if we want to perform 1290 * wildcard match, if gethostname(3) side has 1291 * truncated hostname. 1292 */ 1293 n = ni6_nametodns(hostname, hostnamelen, 0); 1294 if (!n || n->m_next || n->m_len == 0) 1295 goto bad; 1296 IP6_EXTHDR_GET(subj, char *, m, 1297 off + sizeof(struct icmp6_nodeinfo), subjlen); 1298 if (subj == NULL) 1299 goto bad; 1300 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *), 1301 n->m_len)) { 1302 goto bad; 1303 } 1304 m_freem(n); 1305 n = NULL; 1306 break; 1307 1308 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */ 1309 default: 1310 goto bad; 1311 } 1312 break; 1313 } 1314 1315 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */ 1316 switch (qtype) { 1317 case NI_QTYPE_FQDN: 1318 if ((icmp6_nodeinfo & 1) == 0) 1319 goto bad; 1320 break; 1321 case NI_QTYPE_NODEADDR: 1322 case NI_QTYPE_IPV4ADDR: 1323 if ((icmp6_nodeinfo & 2) == 0) 1324 goto bad; 1325 break; 1326 } 1327 1328 /* guess reply length */ 1329 switch (qtype) { 1330 case NI_QTYPE_NOOP: 1331 break; /* no reply data */ 1332 case NI_QTYPE_SUPTYPES: 1333 replylen += sizeof(u_int32_t); 1334 break; 1335 case NI_QTYPE_FQDN: 1336 /* XXX will append an mbuf */ 1337 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1338 break; 1339 case NI_QTYPE_NODEADDR: 1340 addrs = ni6_addrs(ni6, m, &ifp, subj); 1341 if ((replylen += addrs * (sizeof(struct in6_addr) + 1342 sizeof(u_int32_t))) > MCLBYTES) 1343 replylen = MCLBYTES; /* XXX: will truncate pkt later */ 1344 break; 1345 case NI_QTYPE_IPV4ADDR: 1346 /* unsupported - should respond with unknown Qtype? */ 1347 goto bad; 1348 default: 1349 /* 1350 * XXX: We must return a reply with the ICMP6 code 1351 * `unknown Qtype' in this case. However we regard the case 1352 * as an FQDN query for backward compatibility. 1353 * Older versions set a random value to this field, 1354 * so it rarely varies in the defined qtypes. 1355 * But the mechanism is not reliable... 1356 * maybe we should obsolete older versions. 1357 */ 1358 qtype = NI_QTYPE_FQDN; 1359 /* XXX will append an mbuf */ 1360 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1361 oldfqdn++; 1362 break; 1363 } 1364 1365 /* allocate an mbuf to reply. */ 1366 MGETHDR(n, M_DONTWAIT, m->m_type); 1367 if (n == NULL) { 1368 m_freem(m); 1369 return (NULL); 1370 } 1371 M_MOVE_PKTHDR(n, m); /* just for rcvif */ 1372 if (replylen > MHLEN) { 1373 if (replylen > MCLBYTES) { 1374 /* 1375 * XXX: should we try to allocate more? But MCLBYTES 1376 * is probably much larger than IPV6_MMTU... 1377 */ 1378 goto bad; 1379 } 1380 MCLGET(n, M_DONTWAIT); 1381 if ((n->m_flags & M_EXT) == 0) { 1382 goto bad; 1383 } 1384 } 1385 n->m_pkthdr.len = n->m_len = replylen; 1386 1387 /* copy mbuf header and IPv6 + Node Information base headers */ 1388 bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr)); 1389 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1); 1390 bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo)); 1391 1392 /* qtype dependent procedure */ 1393 switch (qtype) { 1394 case NI_QTYPE_NOOP: 1395 nni6->ni_code = ICMP6_NI_SUCCESS; 1396 nni6->ni_flags = 0; 1397 break; 1398 case NI_QTYPE_SUPTYPES: 1399 { 1400 u_int32_t v; 1401 nni6->ni_code = ICMP6_NI_SUCCESS; 1402 nni6->ni_flags = htons(0x0000); /* raw bitmap */ 1403 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */ 1404 v = (u_int32_t)htonl(0x0000000f); 1405 bcopy(&v, nni6 + 1, sizeof(u_int32_t)); 1406 break; 1407 } 1408 case NI_QTYPE_FQDN: 1409 nni6->ni_code = ICMP6_NI_SUCCESS; 1410 fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) + 1411 sizeof(struct ip6_hdr) + 1412 sizeof(struct icmp6_nodeinfo)); 1413 nni6->ni_flags = 0; /* XXX: meaningless TTL */ 1414 fqdn->ni_fqdn_ttl = 0; /* ditto. */ 1415 /* 1416 * XXX do we really have FQDN in variable "hostname"? 1417 */ 1418 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn); 1419 if (n->m_next == NULL) 1420 goto bad; 1421 /* XXX we assume that n->m_next is not a chain */ 1422 if (n->m_next->m_next != NULL) 1423 goto bad; 1424 n->m_pkthdr.len += n->m_next->m_len; 1425 break; 1426 case NI_QTYPE_NODEADDR: 1427 { 1428 int lenlim, copied; 1429 1430 nni6->ni_code = ICMP6_NI_SUCCESS; 1431 n->m_pkthdr.len = n->m_len = 1432 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1433 lenlim = M_TRAILINGSPACE(n); 1434 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim); 1435 /* XXX: reset mbuf length */ 1436 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 1437 sizeof(struct icmp6_nodeinfo) + copied; 1438 break; 1439 } 1440 default: 1441 break; /* XXX impossible! */ 1442 } 1443 1444 nni6->ni_type = ICMP6_NI_REPLY; 1445 m_freem(m); 1446 return (n); 1447 1448 bad: 1449 m_freem(m); 1450 if (n) 1451 m_freem(n); 1452 return (NULL); 1453 } 1454 #undef hostnamelen 1455 1456 #define isupper(x) ('A' <= (x) && (x) <= 'Z') 1457 #define isalpha(x) (('A' <= (x) && (x) <= 'Z') || ('a' <= (x) && (x) <= 'z')) 1458 #define isalnum(x) (isalpha(x) || ('' <= (x) && (x) <= '9')) 1459 #define tolower(x) (isupper(x) ? (x) + 'a' - 'A' : (x)) 1460 1461 /* 1462 * make a mbuf with DNS-encoded string. no compression support. 1463 * 1464 * XXX names with less than 2 dots (like "foo" or "foo.section") will be 1465 * treated as truncated name (two \0 at the end). this is a wild guess. 1466 */ 1467 static struct mbuf * 1468 ni6_nametodns(name, namelen, old) 1469 const char *name; 1470 int namelen; 1471 int old; /* return pascal string if non-zero */ 1472 { 1473 struct mbuf *m; 1474 char *cp, *ep; 1475 const char *p, *q; 1476 int i, len, nterm; 1477 1478 if (old) 1479 len = namelen + 1; 1480 else 1481 len = MCLBYTES; 1482 1483 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */ 1484 MGET(m, M_DONTWAIT, MT_DATA); 1485 if (m && len > MLEN) { 1486 MCLGET(m, M_DONTWAIT); 1487 if ((m->m_flags & M_EXT) == 0) 1488 goto fail; 1489 } 1490 if (!m) 1491 goto fail; 1492 m->m_next = NULL; 1493 1494 if (old) { 1495 m->m_len = len; 1496 *mtod(m, char *) = namelen; 1497 bcopy(name, mtod(m, char *) + 1, namelen); 1498 return m; 1499 } else { 1500 m->m_len = 0; 1501 cp = mtod(m, char *); 1502 ep = mtod(m, char *) + M_TRAILINGSPACE(m); 1503 1504 /* if not certain about my name, return empty buffer */ 1505 if (namelen == 0) 1506 return m; 1507 1508 /* 1509 * guess if it looks like shortened hostname, or FQDN. 1510 * shortened hostname needs two trailing "\0". 1511 */ 1512 i = 0; 1513 for (p = name; p < name + namelen; p++) { 1514 if (*p && *p == '.') 1515 i++; 1516 } 1517 if (i < 2) 1518 nterm = 2; 1519 else 1520 nterm = 1; 1521 1522 p = name; 1523 while (cp < ep && p < name + namelen) { 1524 i = 0; 1525 for (q = p; q < name + namelen && *q && *q != '.'; q++) 1526 i++; 1527 /* result does not fit into mbuf */ 1528 if (cp + i + 1 >= ep) 1529 goto fail; 1530 /* 1531 * DNS label length restriction, RFC1035 page 8. 1532 * "i == 0" case is included here to avoid returning 1533 * 0-length label on "foo..bar". 1534 */ 1535 if (i <= 0 || i >= 64) 1536 goto fail; 1537 *cp++ = i; 1538 if (!isalpha(p[0]) || !isalnum(p[i - 1])) 1539 goto fail; 1540 while (i > 0) { 1541 if (!isalnum(*p) && *p != '-') 1542 goto fail; 1543 if (isupper(*p)) { 1544 *cp++ = tolower(*p); 1545 p++; 1546 } else 1547 *cp++ = *p++; 1548 i--; 1549 } 1550 p = q; 1551 if (p < name + namelen && *p == '.') 1552 p++; 1553 } 1554 /* termination */ 1555 if (cp + nterm >= ep) 1556 goto fail; 1557 while (nterm-- > 0) 1558 *cp++ = '\0'; 1559 m->m_len = cp - mtod(m, char *); 1560 return m; 1561 } 1562 1563 panic("should not reach here"); 1564 /* NOTREACHED */ 1565 1566 fail: 1567 if (m) 1568 m_freem(m); 1569 return NULL; 1570 } 1571 1572 /* 1573 * check if two DNS-encoded string matches. takes care of truncated 1574 * form (with \0\0 at the end). no compression support. 1575 * XXX upper/lowercase match (see RFC2065) 1576 */ 1577 static int 1578 ni6_dnsmatch(a, alen, b, blen) 1579 const char *a; 1580 int alen; 1581 const char *b; 1582 int blen; 1583 { 1584 const char *a0, *b0; 1585 int l; 1586 1587 /* simplest case - need validation? */ 1588 if (alen == blen && bcmp(a, b, alen) == 0) 1589 return 1; 1590 1591 a0 = a; 1592 b0 = b; 1593 1594 /* termination is mandatory */ 1595 if (alen < 2 || blen < 2) 1596 return 0; 1597 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0') 1598 return 0; 1599 alen--; 1600 blen--; 1601 1602 while (a - a0 < alen && b - b0 < blen) { 1603 if (a - a0 + 1 > alen || b - b0 + 1 > blen) 1604 return 0; 1605 1606 if ((signed char)a[0] < 0 || (signed char)b[0] < 0) 1607 return 0; 1608 /* we don't support compression yet */ 1609 if (a[0] >= 64 || b[0] >= 64) 1610 return 0; 1611 1612 /* truncated case */ 1613 if (a[0] == 0 && a - a0 == alen - 1) 1614 return 1; 1615 if (b[0] == 0 && b - b0 == blen - 1) 1616 return 1; 1617 if (a[0] == 0 || b[0] == 0) 1618 return 0; 1619 1620 if (a[0] != b[0]) 1621 return 0; 1622 l = a[0]; 1623 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen) 1624 return 0; 1625 if (bcmp(a + 1, b + 1, l) != 0) 1626 return 0; 1627 1628 a += 1 + l; 1629 b += 1 + l; 1630 } 1631 1632 if (a - a0 == alen && b - b0 == blen) 1633 return 1; 1634 else 1635 return 0; 1636 } 1637 1638 /* 1639 * calculate the number of addresses to be returned in the node info reply. 1640 */ 1641 static int 1642 ni6_addrs(struct icmp6_nodeinfo *ni6, struct mbuf *m, 1643 struct ifnet **ifpp, char *subj) 1644 { 1645 struct ifnet *ifp; 1646 struct in6_ifaddr *ifa6; 1647 struct ifaddr *ifa; 1648 struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */ 1649 int addrs = 0, addrsofif, iffound = 0; 1650 int niflags = ni6->ni_flags; 1651 1652 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) { 1653 switch (ni6->ni_code) { 1654 case ICMP6_NI_SUBJ_IPV6: 1655 if (subj == NULL) /* must be impossible... */ 1656 return (0); 1657 subj_ip6 = (struct sockaddr_in6 *)subj; 1658 break; 1659 default: 1660 /* 1661 * XXX: we only support IPv6 subject address for 1662 * this Qtype. 1663 */ 1664 return (0); 1665 } 1666 } 1667 1668 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) 1669 { 1670 addrsofif = 0; 1671 for (ifa = ifp->if_addrlist.tqh_first; ifa; 1672 ifa = ifa->ifa_list.tqe_next) 1673 { 1674 if (ifa->ifa_addr->sa_family != AF_INET6) 1675 continue; 1676 ifa6 = (struct in6_ifaddr *)ifa; 1677 1678 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 && 1679 IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr, 1680 &ifa6->ia_addr.sin6_addr)) 1681 iffound = 1; 1682 1683 /* 1684 * IPv4-mapped addresses can only be returned by a 1685 * Node Information proxy, since they represent 1686 * addresses of IPv4-only nodes, which perforce do 1687 * not implement this protocol. 1688 * [icmp-name-lookups-07, Section 5.4] 1689 * So we don't support NI_NODEADDR_FLAG_COMPAT in 1690 * this function at this moment. 1691 */ 1692 1693 /* What do we have to do about ::1? */ 1694 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) { 1695 case IPV6_ADDR_SCOPE_LINKLOCAL: 1696 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1697 continue; 1698 break; 1699 case IPV6_ADDR_SCOPE_SITELOCAL: 1700 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1701 continue; 1702 break; 1703 case IPV6_ADDR_SCOPE_GLOBAL: 1704 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1705 continue; 1706 break; 1707 default: 1708 continue; 1709 } 1710 1711 /* 1712 * check if anycast is okay. 1713 * XXX: just experimental. not in the spec. 1714 */ 1715 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1716 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 1717 continue; /* we need only unicast addresses */ 1718 1719 addrsofif++; /* count the address */ 1720 } 1721 if (iffound) { 1722 *ifpp = ifp; 1723 return (addrsofif); 1724 } 1725 1726 addrs += addrsofif; 1727 } 1728 1729 return (addrs); 1730 } 1731 1732 static int 1733 ni6_store_addrs(ni6, nni6, ifp0, resid) 1734 struct icmp6_nodeinfo *ni6, *nni6; 1735 struct ifnet *ifp0; 1736 int resid; 1737 { 1738 struct ifnet *ifp = ifp0 ? ifp0 : TAILQ_FIRST(&ifnet); 1739 struct in6_ifaddr *ifa6; 1740 struct ifaddr *ifa; 1741 struct ifnet *ifp_dep = NULL; 1742 int copied = 0, allow_deprecated = 0; 1743 u_char *cp = (u_char *)(nni6 + 1); 1744 int niflags = ni6->ni_flags; 1745 u_int32_t ltime; 1746 1747 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL)) 1748 return (0); /* needless to copy */ 1749 1750 again: 1751 1752 for (; ifp; ifp = TAILQ_NEXT(ifp, if_list)) 1753 { 1754 for (ifa = ifp->if_addrlist.tqh_first; ifa; 1755 ifa = ifa->ifa_list.tqe_next) 1756 { 1757 if (ifa->ifa_addr->sa_family != AF_INET6) 1758 continue; 1759 ifa6 = (struct in6_ifaddr *)ifa; 1760 1761 if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) != 0 && 1762 allow_deprecated == 0) { 1763 /* 1764 * prefererred address should be put before 1765 * deprecated addresses. 1766 */ 1767 1768 /* record the interface for later search */ 1769 if (ifp_dep == NULL) 1770 ifp_dep = ifp; 1771 1772 continue; 1773 } 1774 else if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) == 0 && 1775 allow_deprecated != 0) 1776 continue; /* we now collect deprecated addrs */ 1777 1778 /* What do we have to do about ::1? */ 1779 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) { 1780 case IPV6_ADDR_SCOPE_LINKLOCAL: 1781 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1782 continue; 1783 break; 1784 case IPV6_ADDR_SCOPE_SITELOCAL: 1785 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1786 continue; 1787 break; 1788 case IPV6_ADDR_SCOPE_GLOBAL: 1789 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1790 continue; 1791 break; 1792 default: 1793 continue; 1794 } 1795 1796 /* 1797 * check if anycast is okay. 1798 * XXX: just experimental. not in the spec. 1799 */ 1800 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1801 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 1802 continue; 1803 1804 /* now we can copy the address */ 1805 if (resid < sizeof(struct in6_addr) + 1806 sizeof(u_int32_t)) { 1807 /* 1808 * We give up much more copy. 1809 * Set the truncate flag and return. 1810 */ 1811 nni6->ni_flags |= NI_NODEADDR_FLAG_TRUNCATE; 1812 return (copied); 1813 } 1814 1815 /* 1816 * Set the TTL of the address. 1817 * The TTL value should be one of the following 1818 * according to the specification: 1819 * 1820 * 1. The remaining lifetime of a DHCP lease on the 1821 * address, or 1822 * 2. The remaining Valid Lifetime of a prefix from 1823 * which the address was derived through Stateless 1824 * Autoconfiguration. 1825 * 1826 * Note that we currently do not support stateful 1827 * address configuration by DHCPv6, so the former 1828 * case can't happen. 1829 * 1830 * TTL must be 2^31 > TTL >= 0. 1831 */ 1832 if (ifa6->ia6_lifetime.ia6t_expire == 0) 1833 ltime = ND6_INFINITE_LIFETIME; 1834 else { 1835 if (ifa6->ia6_lifetime.ia6t_expire > 1836 time_second) 1837 ltime = ifa6->ia6_lifetime.ia6t_expire - 1838 time_second; 1839 else 1840 ltime = 0; 1841 } 1842 if (ltime > 0x7fffffff) 1843 ltime = 0x7fffffff; 1844 ltime = htonl(ltime); 1845 1846 bcopy(<ime, cp, sizeof(u_int32_t)); 1847 cp += sizeof(u_int32_t); 1848 1849 /* copy the address itself */ 1850 bcopy(&ifa6->ia_addr.sin6_addr, cp, 1851 sizeof(struct in6_addr)); 1852 in6_clearscope((struct in6_addr *)cp); /* XXX */ 1853 cp += sizeof(struct in6_addr); 1854 1855 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1856 copied += (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1857 } 1858 if (ifp0) /* we need search only on the specified IF */ 1859 break; 1860 } 1861 1862 if (allow_deprecated == 0 && ifp_dep != NULL) { 1863 ifp = ifp_dep; 1864 allow_deprecated = 1; 1865 1866 goto again; 1867 } 1868 1869 return (copied); 1870 } 1871 1872 /* 1873 * XXX almost dup'ed code with rip6_input. 1874 */ 1875 static int 1876 icmp6_rip6_input(mp, off) 1877 struct mbuf **mp; 1878 int off; 1879 { 1880 struct mbuf *m = *mp; 1881 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1882 struct inpcb_hdr *inph; 1883 struct in6pcb *in6p; 1884 struct in6pcb *last = NULL; 1885 struct sockaddr_in6 rip6src; 1886 struct icmp6_hdr *icmp6; 1887 struct mbuf *opts = NULL; 1888 1889 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 1890 if (icmp6 == NULL) { 1891 /* m is already reclaimed */ 1892 return IPPROTO_DONE; 1893 } 1894 1895 /* 1896 * XXX: the address may have embedded scope zone ID, which should be 1897 * hidden from applications. 1898 */ 1899 bzero(&rip6src, sizeof(rip6src)); 1900 rip6src.sin6_len = sizeof(struct sockaddr_in6); 1901 rip6src.sin6_family = AF_INET6; 1902 rip6src.sin6_addr = ip6->ip6_src; 1903 if (sa6_recoverscope(&rip6src)) { 1904 m_freem(m); 1905 return (IPPROTO_DONE); 1906 } 1907 1908 CIRCLEQ_FOREACH(inph, &raw6cbtable.inpt_queue, inph_queue) { 1909 in6p = (struct in6pcb *)inph; 1910 if (in6p->in6p_af != AF_INET6) 1911 continue; 1912 if (in6p->in6p_ip6.ip6_nxt != IPPROTO_ICMPV6) 1913 continue; 1914 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && 1915 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst)) 1916 continue; 1917 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) && 1918 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src)) 1919 continue; 1920 if (in6p->in6p_icmp6filt 1921 && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type, 1922 in6p->in6p_icmp6filt)) 1923 continue; 1924 if (last) { 1925 struct mbuf *n; 1926 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { 1927 if (last->in6p_flags & IN6P_CONTROLOPTS) 1928 ip6_savecontrol(last, &opts, ip6, n); 1929 /* strip intermediate headers */ 1930 m_adj(n, off); 1931 if (sbappendaddr(&last->in6p_socket->so_rcv, 1932 (struct sockaddr *)&rip6src, 1933 n, opts) == 0) { 1934 /* should notify about lost packet */ 1935 m_freem(n); 1936 if (opts) 1937 m_freem(opts); 1938 } else 1939 sorwakeup(last->in6p_socket); 1940 opts = NULL; 1941 } 1942 } 1943 last = in6p; 1944 } 1945 if (last) { 1946 if (last->in6p_flags & IN6P_CONTROLOPTS) 1947 ip6_savecontrol(last, &opts, ip6, m); 1948 /* strip intermediate headers */ 1949 m_adj(m, off); 1950 if (sbappendaddr(&last->in6p_socket->so_rcv, 1951 (struct sockaddr *)&rip6src, m, opts) == 0) { 1952 m_freem(m); 1953 if (opts) 1954 m_freem(opts); 1955 } else 1956 sorwakeup(last->in6p_socket); 1957 } else { 1958 m_freem(m); 1959 ip6stat.ip6s_delivered--; 1960 } 1961 return IPPROTO_DONE; 1962 } 1963 1964 /* 1965 * Reflect the ip6 packet back to the source. 1966 * OFF points to the icmp6 header, counted from the top of the mbuf. 1967 * 1968 * Note: RFC 1885 required that an echo reply should be truncated if it 1969 * did not fit in with (return) path MTU, and KAME code supported the 1970 * behavior. However, as a clarification after the RFC, this limitation 1971 * was removed in a revised version of the spec, RFC 2463. We had kept the 1972 * old behavior, with a (non-default) ifdef block, while the new version of 1973 * the spec was an internet-draft status, and even after the new RFC was 1974 * published. But it would rather make sense to clean the obsoleted part 1975 * up, and to make the code simpler at this stage. 1976 */ 1977 void 1978 icmp6_reflect(m, off) 1979 struct mbuf *m; 1980 size_t off; 1981 { 1982 struct ip6_hdr *ip6; 1983 struct icmp6_hdr *icmp6; 1984 struct in6_ifaddr *ia; 1985 int plen; 1986 int type, code; 1987 struct ifnet *outif = NULL; 1988 struct in6_addr origdst, *src = NULL; 1989 1990 /* too short to reflect */ 1991 if (off < sizeof(struct ip6_hdr)) { 1992 nd6log((LOG_DEBUG, 1993 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n", 1994 (u_long)off, (u_long)sizeof(struct ip6_hdr), 1995 __FILE__, __LINE__)); 1996 goto bad; 1997 } 1998 1999 /* 2000 * If there are extra headers between IPv6 and ICMPv6, strip 2001 * off that header first. 2002 */ 2003 #ifdef DIAGNOSTIC 2004 if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN) 2005 panic("assumption failed in icmp6_reflect"); 2006 #endif 2007 if (off > sizeof(struct ip6_hdr)) { 2008 size_t l; 2009 struct ip6_hdr nip6; 2010 2011 l = off - sizeof(struct ip6_hdr); 2012 m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6); 2013 m_adj(m, l); 2014 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2015 if (m->m_len < l) { 2016 if ((m = m_pullup(m, l)) == NULL) 2017 return; 2018 } 2019 bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6)); 2020 } else /* off == sizeof(struct ip6_hdr) */ { 2021 size_t l; 2022 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2023 if (m->m_len < l) { 2024 if ((m = m_pullup(m, l)) == NULL) 2025 return; 2026 } 2027 } 2028 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr); 2029 ip6 = mtod(m, struct ip6_hdr *); 2030 ip6->ip6_nxt = IPPROTO_ICMPV6; 2031 icmp6 = (struct icmp6_hdr *)(ip6 + 1); 2032 type = icmp6->icmp6_type; /* keep type for statistics */ 2033 code = icmp6->icmp6_code; /* ditto. */ 2034 2035 origdst = ip6->ip6_dst; 2036 /* 2037 * ip6_input() drops a packet if its src is multicast. 2038 * So, the src is never multicast. 2039 */ 2040 ip6->ip6_dst = ip6->ip6_src; 2041 2042 /* 2043 * If the incoming packet was addressed directly to us (i.e. unicast), 2044 * use dst as the src for the reply. 2045 * The IN6_IFF_NOTREADY case should be VERY rare, but is possible 2046 * (for example) when we encounter an error while forwarding procedure 2047 * destined to a duplicated address of ours. 2048 * Note that ip6_getdstifaddr() may fail if we are in an error handling 2049 * procedure of an outgoing packet of our own, in which case we need 2050 * to search in the ifaddr list. 2051 */ 2052 if (!IN6_IS_ADDR_MULTICAST(&origdst)) { 2053 if ((ia = ip6_getdstifaddr(m))) { 2054 if (!(ia->ia6_flags & 2055 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY))) 2056 src = &ia->ia_addr.sin6_addr; 2057 } else { 2058 struct sockaddr_in6 d; 2059 2060 bzero(&d, sizeof(d)); 2061 d.sin6_family = AF_INET6; 2062 d.sin6_len = sizeof(d); 2063 d.sin6_addr = origdst; 2064 ia = (struct in6_ifaddr *) 2065 ifa_ifwithaddr((struct sockaddr *)&d); 2066 if (ia && 2067 !(ia->ia6_flags & 2068 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY))) { 2069 src = &ia->ia_addr.sin6_addr; 2070 } 2071 } 2072 } 2073 2074 if (src == NULL) { 2075 int e; 2076 struct sockaddr_in6 sin6; 2077 struct route_in6 ro; 2078 2079 /* 2080 * This case matches to multicasts, our anycast, or unicasts 2081 * that we do not own. Select a source address based on the 2082 * source address of the erroneous packet. 2083 */ 2084 bzero(&sin6, sizeof(sin6)); 2085 sin6.sin6_family = AF_INET6; 2086 sin6.sin6_len = sizeof(sin6); 2087 sin6.sin6_addr = ip6->ip6_dst; /* zone ID should be embedded */ 2088 2089 bzero(&ro, sizeof(ro)); 2090 src = in6_selectsrc(&sin6, NULL, NULL, &ro, NULL, &outif, &e); 2091 if (ro.ro_rt) { /* XXX: see comments in icmp6_mtudisc_update */ 2092 RTFREE(ro.ro_rt); /* XXX: we could use this */ 2093 } 2094 if (src == NULL) { 2095 nd6log((LOG_DEBUG, 2096 "icmp6_reflect: source can't be determined: " 2097 "dst=%s, error=%d\n", 2098 ip6_sprintf(&sin6.sin6_addr), e)); 2099 goto bad; 2100 } 2101 } 2102 2103 ip6->ip6_src = *src; 2104 ip6->ip6_flow = 0; 2105 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2106 ip6->ip6_vfc |= IPV6_VERSION; 2107 ip6->ip6_nxt = IPPROTO_ICMPV6; 2108 if (m->m_pkthdr.rcvif) { 2109 /* XXX: This may not be the outgoing interface */ 2110 ip6->ip6_hlim = ND_IFINFO(m->m_pkthdr.rcvif)->chlim; 2111 } else 2112 ip6->ip6_hlim = ip6_defhlim; 2113 2114 m->m_pkthdr.csum_flags = 0; 2115 icmp6->icmp6_cksum = 0; 2116 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6, 2117 sizeof(struct ip6_hdr), plen); 2118 2119 /* 2120 * XXX option handling 2121 */ 2122 2123 m->m_flags &= ~(M_BCAST|M_MCAST); 2124 2125 /* 2126 * To avoid a "too big" situation at an intermediate router 2127 * and the path MTU discovery process, specify the IPV6_MINMTU flag. 2128 * Note that only echo and node information replies are affected, 2129 * since the length of ICMP6 errors is limited to the minimum MTU. 2130 */ 2131 if (ip6_output(m, NULL, NULL, IPV6_MINMTU, NULL, NULL, &outif) != 0 && 2132 outif) 2133 icmp6_ifstat_inc(outif, ifs6_out_error); 2134 2135 if (outif) 2136 icmp6_ifoutstat_inc(outif, type, code); 2137 2138 return; 2139 2140 bad: 2141 m_freem(m); 2142 return; 2143 } 2144 2145 static const char * 2146 icmp6_redirect_diag(src6, dst6, tgt6) 2147 struct in6_addr *src6; 2148 struct in6_addr *dst6; 2149 struct in6_addr *tgt6; 2150 { 2151 static char buf[1024]; 2152 snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)", 2153 ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6)); 2154 return buf; 2155 } 2156 2157 void 2158 icmp6_redirect_input(m, off) 2159 struct mbuf *m; 2160 int off; 2161 { 2162 struct ifnet *ifp = m->m_pkthdr.rcvif; 2163 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 2164 struct nd_redirect *nd_rd; 2165 int icmp6len = ntohs(ip6->ip6_plen); 2166 char *lladdr = NULL; 2167 int lladdrlen = 0; 2168 struct rtentry *rt = NULL; 2169 int is_router; 2170 int is_onlink; 2171 struct in6_addr src6 = ip6->ip6_src; 2172 struct in6_addr redtgt6; 2173 struct in6_addr reddst6; 2174 union nd_opts ndopts; 2175 2176 if (!ifp) 2177 return; 2178 2179 /* XXX if we are router, we don't update route by icmp6 redirect */ 2180 if (ip6_forwarding) 2181 goto freeit; 2182 if (!icmp6_rediraccept) 2183 goto freeit; 2184 2185 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len); 2186 if (nd_rd == NULL) { 2187 icmp6stat.icp6s_tooshort++; 2188 return; 2189 } 2190 redtgt6 = nd_rd->nd_rd_target; 2191 reddst6 = nd_rd->nd_rd_dst; 2192 2193 if (in6_setscope(&redtgt6, m->m_pkthdr.rcvif, NULL) || 2194 in6_setscope(&reddst6, m->m_pkthdr.rcvif, NULL)) { 2195 goto freeit; 2196 } 2197 2198 /* validation */ 2199 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) { 2200 nd6log((LOG_ERR, 2201 "ICMP6 redirect sent from %s rejected; " 2202 "must be from linklocal\n", ip6_sprintf(&src6))); 2203 goto bad; 2204 } 2205 if (ip6->ip6_hlim != 255) { 2206 nd6log((LOG_ERR, 2207 "ICMP6 redirect sent from %s rejected; " 2208 "hlim=%d (must be 255)\n", 2209 ip6_sprintf(&src6), ip6->ip6_hlim)); 2210 goto bad; 2211 } 2212 { 2213 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */ 2214 struct sockaddr_in6 sin6; 2215 struct in6_addr *gw6; 2216 2217 bzero(&sin6, sizeof(sin6)); 2218 sin6.sin6_family = AF_INET6; 2219 sin6.sin6_len = sizeof(struct sockaddr_in6); 2220 bcopy(&reddst6, &sin6.sin6_addr, sizeof(reddst6)); 2221 rt = rtalloc1((struct sockaddr *)&sin6, 0); 2222 if (rt) { 2223 if (rt->rt_gateway == NULL || 2224 rt->rt_gateway->sa_family != AF_INET6) { 2225 nd6log((LOG_ERR, 2226 "ICMP6 redirect rejected; no route " 2227 "with inet6 gateway found for redirect dst: %s\n", 2228 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2229 RTFREE(rt); 2230 goto bad; 2231 } 2232 2233 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr); 2234 if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) { 2235 nd6log((LOG_ERR, 2236 "ICMP6 redirect rejected; " 2237 "not equal to gw-for-src=%s (must be same): " 2238 "%s\n", 2239 ip6_sprintf(gw6), 2240 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2241 RTFREE(rt); 2242 goto bad; 2243 } 2244 } else { 2245 nd6log((LOG_ERR, 2246 "ICMP6 redirect rejected; " 2247 "no route found for redirect dst: %s\n", 2248 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2249 goto bad; 2250 } 2251 RTFREE(rt); 2252 rt = NULL; 2253 } 2254 if (IN6_IS_ADDR_MULTICAST(&reddst6)) { 2255 nd6log((LOG_ERR, 2256 "ICMP6 redirect rejected; " 2257 "redirect dst must be unicast: %s\n", 2258 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2259 goto bad; 2260 } 2261 2262 is_router = is_onlink = 0; 2263 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 2264 is_router = 1; /* router case */ 2265 if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0) 2266 is_onlink = 1; /* on-link destination case */ 2267 if (!is_router && !is_onlink) { 2268 nd6log((LOG_ERR, 2269 "ICMP6 redirect rejected; " 2270 "neither router case nor onlink case: %s\n", 2271 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2272 goto bad; 2273 } 2274 /* validation passed */ 2275 2276 icmp6len -= sizeof(*nd_rd); 2277 nd6_option_init(nd_rd + 1, icmp6len, &ndopts); 2278 if (nd6_options(&ndopts) < 0) { 2279 nd6log((LOG_INFO, "icmp6_redirect_input: " 2280 "invalid ND option, rejected: %s\n", 2281 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2282 /* nd6_options have incremented stats */ 2283 goto freeit; 2284 } 2285 2286 if (ndopts.nd_opts_tgt_lladdr) { 2287 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 2288 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 2289 } 2290 2291 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 2292 nd6log((LOG_INFO, 2293 "icmp6_redirect_input: lladdrlen mismatch for %s " 2294 "(if %d, icmp6 packet %d): %s\n", 2295 ip6_sprintf(&redtgt6), ifp->if_addrlen, lladdrlen - 2, 2296 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2297 goto bad; 2298 } 2299 2300 /* RFC 2461 8.3 */ 2301 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT, 2302 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER); 2303 2304 if (!is_onlink) { /* better router case. perform rtredirect. */ 2305 /* perform rtredirect */ 2306 struct sockaddr_in6 sdst; 2307 struct sockaddr_in6 sgw; 2308 struct sockaddr_in6 ssrc; 2309 unsigned long rtcount; 2310 struct rtentry *newrt = NULL; 2311 2312 /* 2313 * do not install redirect route, if the number of entries 2314 * is too much (> hiwat). note that, the node (= host) will 2315 * work just fine even if we do not install redirect route 2316 * (there will be additional hops, though). 2317 */ 2318 rtcount = rt_timer_count(icmp6_redirect_timeout_q); 2319 if (0 <= icmp6_redirect_hiwat && rtcount > icmp6_redirect_hiwat) 2320 return; 2321 else if (0 <= icmp6_redirect_lowat && 2322 rtcount > icmp6_redirect_lowat) { 2323 /* 2324 * XXX nuke a victim, install the new one. 2325 */ 2326 } 2327 2328 bzero(&sdst, sizeof(sdst)); 2329 bzero(&sgw, sizeof(sgw)); 2330 bzero(&ssrc, sizeof(ssrc)); 2331 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6; 2332 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len = 2333 sizeof(struct sockaddr_in6); 2334 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr)); 2335 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2336 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr)); 2337 rtredirect((struct sockaddr *)&sdst, (struct sockaddr *)&sgw, 2338 (struct sockaddr *)NULL, RTF_GATEWAY | RTF_HOST, 2339 (struct sockaddr *)&ssrc, 2340 &newrt); 2341 2342 if (newrt) { 2343 (void)rt_timer_add(newrt, icmp6_redirect_timeout, 2344 icmp6_redirect_timeout_q); 2345 rtfree(newrt); 2346 } 2347 } 2348 /* finally update cached route in each socket via pfctlinput */ 2349 { 2350 struct sockaddr_in6 sdst; 2351 2352 bzero(&sdst, sizeof(sdst)); 2353 sdst.sin6_family = AF_INET6; 2354 sdst.sin6_len = sizeof(struct sockaddr_in6); 2355 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2356 pfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst); 2357 #if defined(IPSEC) || defined(FAST_IPSEC) 2358 key_sa_routechange((struct sockaddr *)&sdst); 2359 #endif 2360 } 2361 2362 freeit: 2363 m_freem(m); 2364 return; 2365 2366 bad: 2367 icmp6stat.icp6s_badredirect++; 2368 m_freem(m); 2369 } 2370 2371 void 2372 icmp6_redirect_output(m0, rt) 2373 struct mbuf *m0; 2374 struct rtentry *rt; 2375 { 2376 struct ifnet *ifp; /* my outgoing interface */ 2377 struct in6_addr *ifp_ll6; 2378 struct in6_addr *nexthop; 2379 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */ 2380 struct mbuf *m = NULL; /* newly allocated one */ 2381 struct ip6_hdr *ip6; /* m as struct ip6_hdr */ 2382 struct nd_redirect *nd_rd; 2383 size_t maxlen; 2384 u_char *p; 2385 struct sockaddr_in6 src_sa; 2386 2387 icmp6_errcount(&icmp6stat.icp6s_outerrhist, ND_REDIRECT, 0); 2388 2389 /* if we are not router, we don't send icmp6 redirect */ 2390 if (!ip6_forwarding) 2391 goto fail; 2392 2393 /* sanity check */ 2394 if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp)) 2395 goto fail; 2396 2397 /* 2398 * Address check: 2399 * the source address must identify a neighbor, and 2400 * the destination address must not be a multicast address 2401 * [RFC 2461, sec 8.2] 2402 */ 2403 sip6 = mtod(m0, struct ip6_hdr *); 2404 bzero(&src_sa, sizeof(src_sa)); 2405 src_sa.sin6_family = AF_INET6; 2406 src_sa.sin6_len = sizeof(src_sa); 2407 src_sa.sin6_addr = sip6->ip6_src; 2408 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0) 2409 goto fail; 2410 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst)) 2411 goto fail; /* what should we do here? */ 2412 2413 /* rate limit */ 2414 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0)) 2415 goto fail; 2416 2417 /* 2418 * Since we are going to append up to 1280 bytes (= IPV6_MMTU), 2419 * we almost always ask for an mbuf cluster for simplicity. 2420 * (MHLEN < IPV6_MMTU is almost always true) 2421 */ 2422 #if IPV6_MMTU >= MCLBYTES 2423 # error assumption failed about IPV6_MMTU and MCLBYTES 2424 #endif 2425 MGETHDR(m, M_DONTWAIT, MT_HEADER); 2426 if (m && IPV6_MMTU >= MHLEN) 2427 MCLGET(m, M_DONTWAIT); 2428 if (!m) 2429 goto fail; 2430 m->m_pkthdr.rcvif = NULL; 2431 m->m_len = 0; 2432 maxlen = M_TRAILINGSPACE(m); 2433 maxlen = min(IPV6_MMTU, maxlen); 2434 /* just for safety */ 2435 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) + 2436 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) { 2437 goto fail; 2438 } 2439 2440 { 2441 /* get ip6 linklocal address for ifp(my outgoing interface). */ 2442 struct in6_ifaddr *ia; 2443 if ((ia = in6ifa_ifpforlinklocal(ifp, 2444 IN6_IFF_NOTREADY| 2445 IN6_IFF_ANYCAST)) == NULL) 2446 goto fail; 2447 ifp_ll6 = &ia->ia_addr.sin6_addr; 2448 } 2449 2450 /* get ip6 linklocal address for the router. */ 2451 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) { 2452 struct sockaddr_in6 *sin6; 2453 sin6 = (struct sockaddr_in6 *)rt->rt_gateway; 2454 nexthop = &sin6->sin6_addr; 2455 if (!IN6_IS_ADDR_LINKLOCAL(nexthop)) 2456 nexthop = NULL; 2457 } else 2458 nexthop = NULL; 2459 2460 /* ip6 */ 2461 ip6 = mtod(m, struct ip6_hdr *); 2462 ip6->ip6_flow = 0; 2463 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2464 ip6->ip6_vfc |= IPV6_VERSION; 2465 /* ip6->ip6_plen will be set later */ 2466 ip6->ip6_nxt = IPPROTO_ICMPV6; 2467 ip6->ip6_hlim = 255; 2468 /* ip6->ip6_src must be linklocal addr for my outgoing if. */ 2469 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr)); 2470 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr)); 2471 2472 /* ND Redirect */ 2473 nd_rd = (struct nd_redirect *)(ip6 + 1); 2474 nd_rd->nd_rd_type = ND_REDIRECT; 2475 nd_rd->nd_rd_code = 0; 2476 nd_rd->nd_rd_reserved = 0; 2477 if (rt->rt_flags & RTF_GATEWAY) { 2478 /* 2479 * nd_rd->nd_rd_target must be a link-local address in 2480 * better router cases. 2481 */ 2482 if (!nexthop) 2483 goto fail; 2484 bcopy(nexthop, &nd_rd->nd_rd_target, 2485 sizeof(nd_rd->nd_rd_target)); 2486 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2487 sizeof(nd_rd->nd_rd_dst)); 2488 } else { 2489 /* make sure redtgt == reddst */ 2490 nexthop = &sip6->ip6_dst; 2491 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target, 2492 sizeof(nd_rd->nd_rd_target)); 2493 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2494 sizeof(nd_rd->nd_rd_dst)); 2495 } 2496 2497 p = (u_char *)(nd_rd + 1); 2498 2499 { 2500 /* target lladdr option */ 2501 struct rtentry *rt_nexthop = NULL; 2502 int len; 2503 struct sockaddr_dl *sdl; 2504 struct nd_opt_hdr *nd_opt; 2505 char *lladdr; 2506 2507 rt_nexthop = nd6_lookup(nexthop, 0, ifp); 2508 if (!rt_nexthop) 2509 goto nolladdropt; 2510 len = sizeof(*nd_opt) + ifp->if_addrlen; 2511 len = (len + 7) & ~7; /* round by 8 */ 2512 /* safety check */ 2513 if (len + (p - (u_char *)ip6) > maxlen) 2514 goto nolladdropt; 2515 if (!(rt_nexthop->rt_flags & RTF_GATEWAY) && 2516 (rt_nexthop->rt_flags & RTF_LLINFO) && 2517 (rt_nexthop->rt_gateway->sa_family == AF_LINK) && 2518 (sdl = (struct sockaddr_dl *)rt_nexthop->rt_gateway) && 2519 sdl->sdl_alen) { 2520 nd_opt = (struct nd_opt_hdr *)p; 2521 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 2522 nd_opt->nd_opt_len = len >> 3; 2523 lladdr = (char *)(nd_opt + 1); 2524 bcopy(LLADDR(sdl), lladdr, ifp->if_addrlen); 2525 p += len; 2526 } 2527 } 2528 nolladdropt:; 2529 2530 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2531 2532 /* just to be safe */ 2533 if (m0->m_flags & M_DECRYPTED) 2534 goto noredhdropt; 2535 if (p - (u_char *)ip6 > maxlen) 2536 goto noredhdropt; 2537 2538 { 2539 /* redirected header option */ 2540 int len; 2541 struct nd_opt_rd_hdr *nd_opt_rh; 2542 2543 /* 2544 * compute the maximum size for icmp6 redirect header option. 2545 * XXX room for auth header? 2546 */ 2547 len = maxlen - (p - (u_char *)ip6); 2548 len &= ~7; 2549 2550 /* 2551 * Redirected header option spec (RFC2461 4.6.3) talks nothing 2552 * about padding/truncate rule for the original IP packet. 2553 * From the discussion on IPv6imp in Feb 1999, 2554 * the consensus was: 2555 * - "attach as much as possible" is the goal 2556 * - pad if not aligned (original size can be guessed by 2557 * original ip6 header) 2558 * Following code adds the padding if it is simple enough, 2559 * and truncates if not. 2560 */ 2561 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) { 2562 /* not enough room, truncate */ 2563 m_adj(m0, (len - sizeof(*nd_opt_rh)) - 2564 m0->m_pkthdr.len); 2565 } else { 2566 /* 2567 * enough room, truncate if not aligned. 2568 * we don't pad here for simplicity. 2569 */ 2570 size_t extra; 2571 2572 extra = m0->m_pkthdr.len % 8; 2573 if (extra) { 2574 /* truncate */ 2575 m_adj(m0, -extra); 2576 } 2577 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh); 2578 } 2579 2580 nd_opt_rh = (struct nd_opt_rd_hdr *)p; 2581 bzero(nd_opt_rh, sizeof(*nd_opt_rh)); 2582 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER; 2583 nd_opt_rh->nd_opt_rh_len = len >> 3; 2584 p += sizeof(*nd_opt_rh); 2585 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2586 2587 /* connect m0 to m */ 2588 m->m_pkthdr.len += m0->m_pkthdr.len; 2589 m_cat(m, m0); 2590 m0 = NULL; 2591 } 2592 noredhdropt: 2593 if (m0) { 2594 m_freem(m0); 2595 m0 = NULL; 2596 } 2597 2598 /* XXX: clear embedded link IDs in the inner header */ 2599 in6_clearscope(&sip6->ip6_src); 2600 in6_clearscope(&sip6->ip6_dst); 2601 in6_clearscope(&nd_rd->nd_rd_target); 2602 in6_clearscope(&nd_rd->nd_rd_dst); 2603 2604 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 2605 2606 nd_rd->nd_rd_cksum = 0; 2607 nd_rd->nd_rd_cksum 2608 = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen)); 2609 2610 /* send the packet to outside... */ 2611 if (ip6_output(m, NULL, NULL, 0, 2612 (struct ip6_moptions *)NULL, (struct socket *)NULL, NULL) != 0) 2613 icmp6_ifstat_inc(ifp, ifs6_out_error); 2614 2615 icmp6_ifstat_inc(ifp, ifs6_out_msg); 2616 icmp6_ifstat_inc(ifp, ifs6_out_redirect); 2617 icmp6stat.icp6s_outhist[ND_REDIRECT]++; 2618 2619 return; 2620 2621 fail: 2622 if (m) 2623 m_freem(m); 2624 if (m0) 2625 m_freem(m0); 2626 } 2627 2628 /* 2629 * ICMPv6 socket option processing. 2630 */ 2631 int 2632 icmp6_ctloutput(op, so, level, optname, mp) 2633 int op; 2634 struct socket *so; 2635 int level, optname; 2636 struct mbuf **mp; 2637 { 2638 int error = 0; 2639 int optlen; 2640 struct in6pcb *in6p = sotoin6pcb(so); 2641 struct mbuf *m = *mp; 2642 2643 optlen = m ? m->m_len : 0; 2644 2645 if (level != IPPROTO_ICMPV6) { 2646 if (op == PRCO_SETOPT && m) 2647 (void)m_free(m); 2648 return EINVAL; 2649 } 2650 2651 switch (op) { 2652 case PRCO_SETOPT: 2653 switch (optname) { 2654 case ICMP6_FILTER: 2655 { 2656 struct icmp6_filter *p; 2657 2658 if (optlen != sizeof(*p)) { 2659 error = EMSGSIZE; 2660 break; 2661 } 2662 p = mtod(m, struct icmp6_filter *); 2663 if (!p || !in6p->in6p_icmp6filt) { 2664 error = EINVAL; 2665 break; 2666 } 2667 bcopy(p, in6p->in6p_icmp6filt, 2668 sizeof(struct icmp6_filter)); 2669 error = 0; 2670 break; 2671 } 2672 2673 default: 2674 error = ENOPROTOOPT; 2675 break; 2676 } 2677 if (m) 2678 (void)m_freem(m); 2679 break; 2680 2681 case PRCO_GETOPT: 2682 switch (optname) { 2683 case ICMP6_FILTER: 2684 { 2685 struct icmp6_filter *p; 2686 2687 if (!in6p->in6p_icmp6filt) { 2688 error = EINVAL; 2689 break; 2690 } 2691 *mp = m = m_get(M_WAIT, MT_SOOPTS); 2692 m->m_len = sizeof(struct icmp6_filter); 2693 p = mtod(m, struct icmp6_filter *); 2694 bcopy(in6p->in6p_icmp6filt, p, 2695 sizeof(struct icmp6_filter)); 2696 error = 0; 2697 break; 2698 } 2699 2700 default: 2701 error = ENOPROTOOPT; 2702 break; 2703 } 2704 break; 2705 } 2706 2707 return (error); 2708 } 2709 2710 /* 2711 * Perform rate limit check. 2712 * Returns 0 if it is okay to send the icmp6 packet. 2713 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate 2714 * limitation. 2715 * 2716 * XXX per-destination/type check necessary? 2717 */ 2718 static int 2719 icmp6_ratelimit( 2720 const struct in6_addr *dst, /* not used at this moment */ 2721 const int type, /* not used at this moment */ 2722 const int code) /* not used at this moment */ 2723 { 2724 int ret; 2725 2726 ret = 0; /* okay to send */ 2727 2728 /* PPS limit */ 2729 if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count, 2730 icmp6errppslim)) { 2731 /* The packet is subject to rate limit */ 2732 ret++; 2733 } 2734 2735 return ret; 2736 } 2737 2738 static struct rtentry * 2739 icmp6_mtudisc_clone(dst) 2740 struct sockaddr *dst; 2741 { 2742 struct rtentry *rt; 2743 int error; 2744 2745 rt = rtalloc1(dst, 1); 2746 if (rt == 0) 2747 return NULL; 2748 2749 /* If we didn't get a host route, allocate one */ 2750 if ((rt->rt_flags & RTF_HOST) == 0) { 2751 struct rtentry *nrt; 2752 2753 error = rtrequest((int) RTM_ADD, dst, 2754 (struct sockaddr *) rt->rt_gateway, 2755 (struct sockaddr *) 0, 2756 RTF_GATEWAY | RTF_HOST | RTF_DYNAMIC, &nrt); 2757 if (error) { 2758 rtfree(rt); 2759 return NULL; 2760 } 2761 nrt->rt_rmx = rt->rt_rmx; 2762 rtfree(rt); 2763 rt = nrt; 2764 } 2765 error = rt_timer_add(rt, icmp6_mtudisc_timeout, 2766 icmp6_mtudisc_timeout_q); 2767 if (error) { 2768 rtfree(rt); 2769 return NULL; 2770 } 2771 2772 return rt; /* caller need to call rtfree() */ 2773 } 2774 2775 static void 2776 icmp6_mtudisc_timeout(struct rtentry *rt, struct rttimer *r) 2777 { 2778 if (rt == NULL) 2779 panic("icmp6_mtudisc_timeout: bad route to timeout"); 2780 if ((rt->rt_flags & (RTF_DYNAMIC | RTF_HOST)) == 2781 (RTF_DYNAMIC | RTF_HOST)) { 2782 rtrequest((int) RTM_DELETE, (struct sockaddr *)rt_key(rt), 2783 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0); 2784 } else { 2785 if (!(rt->rt_rmx.rmx_locks & RTV_MTU)) 2786 rt->rt_rmx.rmx_mtu = 0; 2787 } 2788 } 2789 2790 static void 2791 icmp6_redirect_timeout(struct rtentry *rt, struct rttimer *r) 2792 { 2793 if (rt == NULL) 2794 panic("icmp6_redirect_timeout: bad route to timeout"); 2795 if ((rt->rt_flags & (RTF_GATEWAY | RTF_DYNAMIC | RTF_HOST)) == 2796 (RTF_GATEWAY | RTF_DYNAMIC | RTF_HOST)) { 2797 rtrequest((int) RTM_DELETE, (struct sockaddr *)rt_key(rt), 2798 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0); 2799 } 2800 } 2801 2802 /* 2803 * sysctl helper routine for the net.inet6.icmp6.nd6 nodes. silly? 2804 */ 2805 static int 2806 sysctl_net_inet6_icmp6_nd6(SYSCTLFN_ARGS) 2807 { 2808 (void)&name; 2809 (void)&l; 2810 (void)&oname; 2811 2812 if (namelen != 0) 2813 return (EINVAL); 2814 2815 return (nd6_sysctl(rnode->sysctl_num, oldp, oldlenp, 2816 /*XXXUNCONST*/ 2817 __UNCONST(newp), newlen)); 2818 } 2819 2820 SYSCTL_SETUP(sysctl_net_inet6_icmp6_setup, 2821 "sysctl net.inet6.icmp6 subtree setup") 2822 { 2823 extern int nd6_maxqueuelen; /* defined in nd6.c */ 2824 2825 sysctl_createv(clog, 0, NULL, NULL, 2826 CTLFLAG_PERMANENT, 2827 CTLTYPE_NODE, "net", NULL, 2828 NULL, 0, NULL, 0, 2829 CTL_NET, CTL_EOL); 2830 sysctl_createv(clog, 0, NULL, NULL, 2831 CTLFLAG_PERMANENT, 2832 CTLTYPE_NODE, "inet6", NULL, 2833 NULL, 0, NULL, 0, 2834 CTL_NET, PF_INET6, CTL_EOL); 2835 sysctl_createv(clog, 0, NULL, NULL, 2836 CTLFLAG_PERMANENT, 2837 CTLTYPE_NODE, "icmp6", 2838 SYSCTL_DESCR("ICMPv6 related settings"), 2839 NULL, 0, NULL, 0, 2840 CTL_NET, PF_INET6, IPPROTO_ICMPV6, CTL_EOL); 2841 2842 sysctl_createv(clog, 0, NULL, NULL, 2843 CTLFLAG_PERMANENT, 2844 CTLTYPE_STRUCT, "stats", 2845 SYSCTL_DESCR("ICMPv6 transmission statistics"), 2846 NULL, 0, &icmp6stat, sizeof(icmp6stat), 2847 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2848 ICMPV6CTL_STATS, CTL_EOL); 2849 sysctl_createv(clog, 0, NULL, NULL, 2850 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2851 CTLTYPE_INT, "rediraccept", 2852 SYSCTL_DESCR("Accept and process redirect messages"), 2853 NULL, 0, &icmp6_rediraccept, 0, 2854 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2855 ICMPV6CTL_REDIRACCEPT, CTL_EOL); 2856 sysctl_createv(clog, 0, NULL, NULL, 2857 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2858 CTLTYPE_INT, "redirtimeout", 2859 SYSCTL_DESCR("Redirect generated route lifetime"), 2860 NULL, 0, &icmp6_redirtimeout, 0, 2861 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2862 ICMPV6CTL_REDIRTIMEOUT, CTL_EOL); 2863 #if 0 /* obsoleted */ 2864 sysctl_createv(clog, 0, NULL, NULL, 2865 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2866 CTLTYPE_INT, "errratelimit", NULL, 2867 NULL, 0, &icmp6_errratelimit, 0, 2868 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2869 ICMPV6CTL_ERRRATELIMIT, CTL_EOL); 2870 #endif 2871 sysctl_createv(clog, 0, NULL, NULL, 2872 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2873 CTLTYPE_INT, "nd6_prune", 2874 SYSCTL_DESCR("Neighbor discovery prune interval"), 2875 NULL, 0, &nd6_prune, 0, 2876 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2877 ICMPV6CTL_ND6_PRUNE, CTL_EOL); 2878 sysctl_createv(clog, 0, NULL, NULL, 2879 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2880 CTLTYPE_INT, "nd6_delay", 2881 SYSCTL_DESCR("First probe delay time"), 2882 NULL, 0, &nd6_delay, 0, 2883 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2884 ICMPV6CTL_ND6_DELAY, CTL_EOL); 2885 sysctl_createv(clog, 0, NULL, NULL, 2886 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2887 CTLTYPE_INT, "nd6_umaxtries", 2888 SYSCTL_DESCR("Number of unicast discovery attempts"), 2889 NULL, 0, &nd6_umaxtries, 0, 2890 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2891 ICMPV6CTL_ND6_UMAXTRIES, CTL_EOL); 2892 sysctl_createv(clog, 0, NULL, NULL, 2893 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2894 CTLTYPE_INT, "nd6_mmaxtries", 2895 SYSCTL_DESCR("Number of multicast discovery attempts"), 2896 NULL, 0, &nd6_mmaxtries, 0, 2897 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2898 ICMPV6CTL_ND6_MMAXTRIES, CTL_EOL); 2899 sysctl_createv(clog, 0, NULL, NULL, 2900 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2901 CTLTYPE_INT, "nd6_useloopback", 2902 SYSCTL_DESCR("Use loopback interface for local traffic"), 2903 NULL, 0, &nd6_useloopback, 0, 2904 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2905 ICMPV6CTL_ND6_USELOOPBACK, CTL_EOL); 2906 #if 0 /* obsoleted */ 2907 sysctl_createv(clog, 0, NULL, NULL, 2908 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2909 CTLTYPE_INT, "nd6_proxyall", NULL, 2910 NULL, 0, &nd6_proxyall, 0, 2911 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2912 ICMPV6CTL_ND6_PROXYALL, CTL_EOL); 2913 #endif 2914 sysctl_createv(clog, 0, NULL, NULL, 2915 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2916 CTLTYPE_INT, "nodeinfo", 2917 SYSCTL_DESCR("Respond to node information requests"), 2918 NULL, 0, &icmp6_nodeinfo, 0, 2919 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2920 ICMPV6CTL_NODEINFO, CTL_EOL); 2921 sysctl_createv(clog, 0, NULL, NULL, 2922 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2923 CTLTYPE_INT, "errppslimit", 2924 SYSCTL_DESCR("Maximum ICMP errors sent per second"), 2925 NULL, 0, &icmp6errppslim, 0, 2926 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2927 ICMPV6CTL_ERRPPSLIMIT, CTL_EOL); 2928 sysctl_createv(clog, 0, NULL, NULL, 2929 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2930 CTLTYPE_INT, "nd6_maxnudhint", 2931 SYSCTL_DESCR("Maximum neighbor unreachable hint count"), 2932 NULL, 0, &nd6_maxnudhint, 0, 2933 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2934 ICMPV6CTL_ND6_MAXNUDHINT, CTL_EOL); 2935 sysctl_createv(clog, 0, NULL, NULL, 2936 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2937 CTLTYPE_INT, "mtudisc_hiwat", 2938 SYSCTL_DESCR("Low mark on MTU Discovery route timers"), 2939 NULL, 0, &icmp6_mtudisc_hiwat, 0, 2940 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2941 ICMPV6CTL_MTUDISC_HIWAT, CTL_EOL); 2942 sysctl_createv(clog, 0, NULL, NULL, 2943 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2944 CTLTYPE_INT, "mtudisc_lowat", 2945 SYSCTL_DESCR("Low mark on MTU Discovery route timers"), 2946 NULL, 0, &icmp6_mtudisc_lowat, 0, 2947 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2948 ICMPV6CTL_MTUDISC_LOWAT, CTL_EOL); 2949 sysctl_createv(clog, 0, NULL, NULL, 2950 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2951 CTLTYPE_INT, "nd6_debug", 2952 SYSCTL_DESCR("Enable neighbor discovery debug output"), 2953 NULL, 0, &nd6_debug, 0, 2954 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2955 ICMPV6CTL_ND6_DEBUG, CTL_EOL); 2956 sysctl_createv(clog, 0, NULL, NULL, 2957 CTLFLAG_PERMANENT, 2958 CTLTYPE_STRUCT, "nd6_drlist", 2959 SYSCTL_DESCR("Default router list"), 2960 sysctl_net_inet6_icmp6_nd6, 0, NULL, 0, 2961 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2962 ICMPV6CTL_ND6_DRLIST, CTL_EOL); 2963 sysctl_createv(clog, 0, NULL, NULL, 2964 CTLFLAG_PERMANENT, 2965 CTLTYPE_STRUCT, "nd6_prlist", 2966 SYSCTL_DESCR("Prefix list"), 2967 sysctl_net_inet6_icmp6_nd6, 0, NULL, 0, 2968 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2969 ICMPV6CTL_ND6_PRLIST, CTL_EOL); 2970 sysctl_createv(clog, 0, NULL, NULL, 2971 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2972 CTLTYPE_INT, "maxqueuelen", 2973 SYSCTL_DESCR("max packet queue len for a unresolved ND"), 2974 NULL, 1, &nd6_maxqueuelen, 0, 2975 CTL_NET, PF_INET6, IPPROTO_ICMPV6, 2976 ICMPV6CTL_ND6_MAXQLEN, CTL_EOL); 2977 }
Cache object: e6013e6a78f72992e30be213d6269ae8
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