Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/netinet6/icmp6.c
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1 /* $FreeBSD: releng/5.0/sys/netinet6/icmp6.c 105199 2002-10-16 02:25:05Z sam $ */ 2 /* $KAME: icmp6.c,v 1.211 2001/04/04 05:56:20 itojun Exp $ */ 3 4 /* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* 34 * Copyright (c) 1982, 1986, 1988, 1993 35 * The Regents of the University of California. All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. All advertising materials mentioning features or use of this software 46 * must display the following acknowledgement: 47 * This product includes software developed by the University of 48 * California, Berkeley and its contributors. 49 * 4. Neither the name of the University nor the names of its contributors 50 * may be used to endorse or promote products derived from this software 51 * without specific prior written permission. 52 * 53 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 54 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 55 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 56 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 57 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 58 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 59 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 61 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 62 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 63 * SUCH DAMAGE. 64 * 65 * @(#)ip_icmp.c 8.2 (Berkeley) 1/4/94 66 */ 67 68 #include "opt_inet.h" 69 #include "opt_inet6.h" 70 #include "opt_ipsec.h" 71 72 #include <sys/param.h> 73 #include <sys/domain.h> 74 #include <sys/kernel.h> 75 #include <sys/lock.h> 76 #include <sys/malloc.h> 77 #include <sys/mbuf.h> 78 #include <sys/protosw.h> 79 #include <sys/signalvar.h> 80 #include <sys/socket.h> 81 #include <sys/socketvar.h> 82 #include <sys/sx.h> 83 #include <sys/syslog.h> 84 #include <sys/systm.h> 85 #include <sys/time.h> 86 87 #include <net/if.h> 88 #include <net/if_dl.h> 89 #include <net/if_types.h> 90 #include <net/route.h> 91 92 #include <netinet/in.h> 93 #include <netinet/in_pcb.h> 94 #include <netinet/in_var.h> 95 #include <netinet/ip6.h> 96 #include <netinet/icmp6.h> 97 #include <netinet6/in6_ifattach.h> 98 #include <netinet6/in6_pcb.h> 99 #include <netinet6/ip6protosw.h> 100 #include <netinet6/ip6_var.h> 101 #include <netinet6/mld6_var.h> 102 #include <netinet6/nd6.h> 103 104 #ifdef IPSEC 105 #include <netinet6/ipsec.h> 106 #include <netkey/key.h> 107 #endif 108 109 #ifdef FAST_IPSEC 110 #include <netipsec/ipsec.h> 111 #include <netipsec/key.h> 112 #define IPSEC 113 #endif 114 115 #include <net/net_osdep.h> 116 117 #ifdef HAVE_NRL_INPCB 118 /* inpcb members */ 119 #define in6pcb inpcb 120 #define in6p_laddr inp_laddr6 121 #define in6p_faddr inp_faddr6 122 #define in6p_icmp6filt inp_icmp6filt 123 #define in6p_route inp_route 124 #define in6p_socket inp_socket 125 #define in6p_flags inp_flags 126 #define in6p_moptions inp_moptions6 127 #define in6p_outputopts inp_outputopts6 128 #define in6p_ip6 inp_ipv6 129 #define in6p_flowinfo inp_flowinfo 130 #define in6p_sp inp_sp 131 #define in6p_next inp_next 132 #define in6p_prev inp_prev 133 /* macro names */ 134 #define sotoin6pcb sotoinpcb 135 /* function names */ 136 #define in6_pcbdetach in_pcbdetach 137 #define in6_rtchange in_rtchange 138 139 /* 140 * for KAME src sync over BSD*'s. XXX: FreeBSD (>=3) are VERY different from 141 * others... 142 */ 143 #define in6p_ip6_nxt inp_ipv6.ip6_nxt 144 #endif 145 146 extern struct domain inet6domain; 147 148 struct icmp6stat icmp6stat; 149 150 extern struct inpcbhead ripcb; 151 extern int icmp6errppslim; 152 static int icmp6errpps_count = 0; 153 static struct timeval icmp6errppslim_last; 154 extern int icmp6_nodeinfo; 155 156 static void icmp6_errcount __P((struct icmp6errstat *, int, int)); 157 static int icmp6_rip6_input __P((struct mbuf **, int)); 158 static int icmp6_ratelimit __P((const struct in6_addr *, const int, const int)); 159 static const char *icmp6_redirect_diag __P((struct in6_addr *, 160 struct in6_addr *, struct in6_addr *)); 161 #ifndef HAVE_PPSRATECHECK 162 static int ppsratecheck __P((struct timeval *, int *, int)); 163 #endif 164 static struct mbuf *ni6_input __P((struct mbuf *, int)); 165 static struct mbuf *ni6_nametodns __P((const char *, int, int)); 166 static int ni6_dnsmatch __P((const char *, int, const char *, int)); 167 static int ni6_addrs __P((struct icmp6_nodeinfo *, struct mbuf *, 168 struct ifnet **, char *)); 169 static int ni6_store_addrs __P((struct icmp6_nodeinfo *, struct icmp6_nodeinfo *, 170 struct ifnet *, int)); 171 static int icmp6_notify_error __P((struct mbuf *, int, int, int)); 172 173 #ifdef COMPAT_RFC1885 174 static struct route_in6 icmp6_reflect_rt; 175 #endif 176 177 178 void 179 icmp6_init() 180 { 181 mld6_init(); 182 } 183 184 static void 185 icmp6_errcount(stat, type, code) 186 struct icmp6errstat *stat; 187 int type, code; 188 { 189 switch (type) { 190 case ICMP6_DST_UNREACH: 191 switch (code) { 192 case ICMP6_DST_UNREACH_NOROUTE: 193 stat->icp6errs_dst_unreach_noroute++; 194 return; 195 case ICMP6_DST_UNREACH_ADMIN: 196 stat->icp6errs_dst_unreach_admin++; 197 return; 198 case ICMP6_DST_UNREACH_BEYONDSCOPE: 199 stat->icp6errs_dst_unreach_beyondscope++; 200 return; 201 case ICMP6_DST_UNREACH_ADDR: 202 stat->icp6errs_dst_unreach_addr++; 203 return; 204 case ICMP6_DST_UNREACH_NOPORT: 205 stat->icp6errs_dst_unreach_noport++; 206 return; 207 } 208 break; 209 case ICMP6_PACKET_TOO_BIG: 210 stat->icp6errs_packet_too_big++; 211 return; 212 case ICMP6_TIME_EXCEEDED: 213 switch (code) { 214 case ICMP6_TIME_EXCEED_TRANSIT: 215 stat->icp6errs_time_exceed_transit++; 216 return; 217 case ICMP6_TIME_EXCEED_REASSEMBLY: 218 stat->icp6errs_time_exceed_reassembly++; 219 return; 220 } 221 break; 222 case ICMP6_PARAM_PROB: 223 switch (code) { 224 case ICMP6_PARAMPROB_HEADER: 225 stat->icp6errs_paramprob_header++; 226 return; 227 case ICMP6_PARAMPROB_NEXTHEADER: 228 stat->icp6errs_paramprob_nextheader++; 229 return; 230 case ICMP6_PARAMPROB_OPTION: 231 stat->icp6errs_paramprob_option++; 232 return; 233 } 234 break; 235 case ND_REDIRECT: 236 stat->icp6errs_redirect++; 237 return; 238 } 239 stat->icp6errs_unknown++; 240 } 241 242 /* 243 * Generate an error packet of type error in response to bad IP6 packet. 244 */ 245 void 246 icmp6_error(m, type, code, param) 247 struct mbuf *m; 248 int type, code, param; 249 { 250 struct ip6_hdr *oip6, *nip6; 251 struct icmp6_hdr *icmp6; 252 u_int preplen; 253 int off; 254 int nxt; 255 256 icmp6stat.icp6s_error++; 257 258 /* count per-type-code statistics */ 259 icmp6_errcount(&icmp6stat.icp6s_outerrhist, type, code); 260 261 #ifdef M_DECRYPTED /*not openbsd*/ 262 if (m->m_flags & M_DECRYPTED) { 263 icmp6stat.icp6s_canterror++; 264 goto freeit; 265 } 266 #endif 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 nd6log((LOG_DEBUG, "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 /* 371 * icmp6_reflect() is designed to be in the input path. 372 * icmp6_error() can be called from both input and outut path, 373 * and if we are in output path rcvif could contain bogus value. 374 * clear m->m_pkthdr.rcvif for safety, we should have enough scope 375 * information in ip header (nip6). 376 */ 377 m->m_pkthdr.rcvif = NULL; 378 379 icmp6stat.icp6s_outhist[type]++; 380 icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */ 381 382 return; 383 384 freeit: 385 /* 386 * If we can't tell wheter or not we can generate ICMP6, free it. 387 */ 388 m_freem(m); 389 } 390 391 /* 392 * Process a received ICMP6 message. 393 */ 394 int 395 icmp6_input(mp, offp, proto) 396 struct mbuf **mp; 397 int *offp, proto; 398 { 399 struct mbuf *m = *mp, *n; 400 struct ip6_hdr *ip6, *nip6; 401 struct icmp6_hdr *icmp6, *nicmp6; 402 int off = *offp; 403 int icmp6len = m->m_pkthdr.len - *offp; 404 int code, sum, noff; 405 406 #ifndef PULLDOWN_TEST 407 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr), IPPROTO_DONE); 408 /* m might change if M_LOOP. So, call mtod after this */ 409 #endif 410 411 /* 412 * Locate icmp6 structure in mbuf, and check 413 * that not corrupted and of at least minimum length 414 */ 415 416 ip6 = mtod(m, struct ip6_hdr *); 417 if (icmp6len < sizeof(struct icmp6_hdr)) { 418 icmp6stat.icp6s_tooshort++; 419 goto freeit; 420 } 421 422 /* 423 * calculate the checksum 424 */ 425 #ifndef PULLDOWN_TEST 426 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off); 427 #else 428 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 429 if (icmp6 == NULL) { 430 icmp6stat.icp6s_tooshort++; 431 return IPPROTO_DONE; 432 } 433 #endif 434 code = icmp6->icmp6_code; 435 436 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) { 437 nd6log((LOG_ERR, 438 "ICMP6 checksum error(%d|%x) %s\n", 439 icmp6->icmp6_type, sum, ip6_sprintf(&ip6->ip6_src))); 440 icmp6stat.icp6s_checksum++; 441 goto freeit; 442 } 443 444 if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) { 445 /* 446 * Deliver very specific ICMP6 type only. 447 * This is important to deilver TOOBIG. Otherwise PMTUD 448 * will not work. 449 */ 450 switch (icmp6->icmp6_type) { 451 case ICMP6_DST_UNREACH: 452 case ICMP6_PACKET_TOO_BIG: 453 case ICMP6_TIME_EXCEEDED: 454 break; 455 default: 456 goto freeit; 457 } 458 } 459 460 icmp6stat.icp6s_inhist[icmp6->icmp6_type]++; 461 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_msg); 462 if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK) 463 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error); 464 465 switch (icmp6->icmp6_type) { 466 case ICMP6_DST_UNREACH: 467 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_dstunreach); 468 switch (code) { 469 case ICMP6_DST_UNREACH_NOROUTE: 470 code = PRC_UNREACH_NET; 471 break; 472 case ICMP6_DST_UNREACH_ADMIN: 473 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_adminprohib); 474 code = PRC_UNREACH_PROTOCOL; /* is this a good code? */ 475 break; 476 case ICMP6_DST_UNREACH_ADDR: 477 code = PRC_HOSTDEAD; 478 break; 479 #ifdef COMPAT_RFC1885 480 case ICMP6_DST_UNREACH_NOTNEIGHBOR: 481 code = PRC_UNREACH_SRCFAIL; 482 break; 483 #else 484 case ICMP6_DST_UNREACH_BEYONDSCOPE: 485 /* I mean "source address was incorrect." */ 486 code = PRC_PARAMPROB; 487 break; 488 #endif 489 case ICMP6_DST_UNREACH_NOPORT: 490 code = PRC_UNREACH_PORT; 491 break; 492 default: 493 goto badcode; 494 } 495 goto deliver; 496 break; 497 498 case ICMP6_PACKET_TOO_BIG: 499 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_pkttoobig); 500 if (code != 0) 501 goto badcode; 502 503 code = PRC_MSGSIZE; 504 505 /* 506 * Updating the path MTU will be done after examining 507 * intermediate extension headers. 508 */ 509 goto deliver; 510 break; 511 512 case ICMP6_TIME_EXCEEDED: 513 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_timeexceed); 514 switch (code) { 515 case ICMP6_TIME_EXCEED_TRANSIT: 516 case ICMP6_TIME_EXCEED_REASSEMBLY: 517 code += PRC_TIMXCEED_INTRANS; 518 break; 519 default: 520 goto badcode; 521 } 522 goto deliver; 523 break; 524 525 case ICMP6_PARAM_PROB: 526 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_paramprob); 527 switch (code) { 528 case ICMP6_PARAMPROB_NEXTHEADER: 529 code = PRC_UNREACH_PROTOCOL; 530 break; 531 case ICMP6_PARAMPROB_HEADER: 532 case ICMP6_PARAMPROB_OPTION: 533 code = PRC_PARAMPROB; 534 break; 535 default: 536 goto badcode; 537 } 538 goto deliver; 539 break; 540 541 case ICMP6_ECHO_REQUEST: 542 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echo); 543 if (code != 0) 544 goto badcode; 545 if ((n = m_copy(m, 0, M_COPYALL)) == NULL) { 546 /* Give up remote */ 547 break; 548 } 549 if ((n->m_flags & M_EXT) != 0 550 || n->m_len < off + sizeof(struct icmp6_hdr)) { 551 struct mbuf *n0 = n; 552 const int maxlen = sizeof(*nip6) + sizeof(*nicmp6); 553 554 /* 555 * Prepare an internal mbuf. m_pullup() doesn't 556 * always copy the length we specified. 557 */ 558 if (maxlen >= MCLBYTES) { 559 /* Give up remote */ 560 m_freem(n0); 561 break; 562 } 563 MGETHDR(n, M_DONTWAIT, n0->m_type); 564 if (n && maxlen >= MHLEN) { 565 MCLGET(n, M_DONTWAIT); 566 if ((n->m_flags & M_EXT) == 0) { 567 m_free(n); 568 n = NULL; 569 } 570 } 571 if (n == NULL) { 572 /* Give up remote */ 573 m_freem(n0); 574 break; 575 } 576 M_COPY_PKTHDR(n, n0); 577 /* 578 * Copy IPv6 and ICMPv6 only. 579 */ 580 nip6 = mtod(n, struct ip6_hdr *); 581 bcopy(ip6, nip6, sizeof(struct ip6_hdr)); 582 nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 583 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); 584 noff = sizeof(struct ip6_hdr); 585 n->m_pkthdr.len = n->m_len = 586 noff + sizeof(struct icmp6_hdr); 587 /* 588 * Adjust mbuf. ip6_plen will be adjusted in 589 * ip6_output(). 590 */ 591 m_adj(n0, off + sizeof(struct icmp6_hdr)); 592 n->m_pkthdr.len += n0->m_pkthdr.len; 593 n->m_next = n0; 594 n0->m_flags &= ~M_PKTHDR; 595 } else { 596 nip6 = mtod(n, struct ip6_hdr *); 597 nicmp6 = (struct icmp6_hdr *)((caddr_t)nip6 + off); 598 noff = off; 599 } 600 nicmp6->icmp6_type = ICMP6_ECHO_REPLY; 601 nicmp6->icmp6_code = 0; 602 if (n) { 603 icmp6stat.icp6s_reflect++; 604 icmp6stat.icp6s_outhist[ICMP6_ECHO_REPLY]++; 605 icmp6_reflect(n, noff); 606 } 607 break; 608 609 case ICMP6_ECHO_REPLY: 610 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echoreply); 611 if (code != 0) 612 goto badcode; 613 break; 614 615 case MLD_LISTENER_QUERY: 616 case MLD_LISTENER_REPORT: 617 if (icmp6len < sizeof(struct mld_hdr)) 618 goto badlen; 619 if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */ 620 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldquery); 621 else 622 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldreport); 623 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 624 /* give up local */ 625 mld6_input(m, off); 626 m = NULL; 627 goto freeit; 628 } 629 mld6_input(n, off); 630 /* m stays. */ 631 break; 632 633 case MLD_LISTENER_DONE: 634 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mlddone); 635 if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */ 636 goto badlen; 637 break; /* nothing to be done in kernel */ 638 639 case MLD_MTRACE_RESP: 640 case MLD_MTRACE: 641 /* XXX: these two are experimental. not officially defind. */ 642 /* XXX: per-interface statistics? */ 643 break; /* just pass it to applications */ 644 645 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */ 646 { 647 enum { WRU, FQDN } mode; 648 649 if (!icmp6_nodeinfo) 650 break; 651 652 if (icmp6len == sizeof(struct icmp6_hdr) + 4) 653 mode = WRU; 654 else if (icmp6len >= sizeof(struct icmp6_nodeinfo)) 655 mode = FQDN; 656 else 657 goto badlen; 658 659 #define hostnamelen strlen(hostname) 660 if (mode == FQDN) { 661 #ifndef PULLDOWN_TEST 662 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo), 663 IPPROTO_DONE); 664 #endif 665 n = m_copy(m, 0, M_COPYALL); 666 if (n) 667 n = ni6_input(n, off); 668 /* XXX meaningless if n == NULL */ 669 noff = sizeof(struct ip6_hdr); 670 } else { 671 u_char *p; 672 int maxlen, maxhlen; 673 674 if ((icmp6_nodeinfo & 5) != 5) 675 break; 676 677 if (code != 0) 678 goto badcode; 679 maxlen = sizeof(*nip6) + sizeof(*nicmp6) + 4; 680 if (maxlen >= MCLBYTES) { 681 /* Give up remote */ 682 break; 683 } 684 MGETHDR(n, M_DONTWAIT, m->m_type); 685 if (n && maxlen > MHLEN) { 686 MCLGET(n, M_DONTWAIT); 687 if ((n->m_flags & M_EXT) == 0) { 688 m_free(n); 689 n = NULL; 690 } 691 } 692 if (n == NULL) { 693 /* Give up remote */ 694 break; 695 } 696 n->m_pkthdr.rcvif = NULL; 697 n->m_len = 0; 698 maxhlen = M_TRAILINGSPACE(n) - maxlen; 699 if (maxhlen > hostnamelen) 700 maxhlen = hostnamelen; 701 /* 702 * Copy IPv6 and ICMPv6 only. 703 */ 704 nip6 = mtod(n, struct ip6_hdr *); 705 bcopy(ip6, nip6, sizeof(struct ip6_hdr)); 706 nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 707 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); 708 p = (u_char *)(nicmp6 + 1); 709 bzero(p, 4); 710 bcopy(hostname, p + 4, maxhlen); /* meaningless TTL */ 711 noff = sizeof(struct ip6_hdr); 712 M_COPY_PKTHDR(n, m); /* just for rcvif */ 713 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 714 sizeof(struct icmp6_hdr) + 4 + maxhlen; 715 nicmp6->icmp6_type = ICMP6_WRUREPLY; 716 nicmp6->icmp6_code = 0; 717 } 718 #undef hostnamelen 719 if (n) { 720 icmp6stat.icp6s_reflect++; 721 icmp6stat.icp6s_outhist[ICMP6_WRUREPLY]++; 722 icmp6_reflect(n, noff); 723 } 724 break; 725 } 726 727 case ICMP6_WRUREPLY: 728 if (code != 0) 729 goto badcode; 730 break; 731 732 case ND_ROUTER_SOLICIT: 733 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routersolicit); 734 if (code != 0) 735 goto badcode; 736 if (icmp6len < sizeof(struct nd_router_solicit)) 737 goto badlen; 738 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 739 /* give up local */ 740 nd6_rs_input(m, off, icmp6len); 741 m = NULL; 742 goto freeit; 743 } 744 nd6_rs_input(n, off, icmp6len); 745 /* m stays. */ 746 break; 747 748 case ND_ROUTER_ADVERT: 749 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routeradvert); 750 if (code != 0) 751 goto badcode; 752 if (icmp6len < sizeof(struct nd_router_advert)) 753 goto badlen; 754 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 755 /* give up local */ 756 nd6_ra_input(m, off, icmp6len); 757 m = NULL; 758 goto freeit; 759 } 760 nd6_ra_input(n, off, icmp6len); 761 /* m stays. */ 762 break; 763 764 case ND_NEIGHBOR_SOLICIT: 765 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighborsolicit); 766 if (code != 0) 767 goto badcode; 768 if (icmp6len < sizeof(struct nd_neighbor_solicit)) 769 goto badlen; 770 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 771 /* give up local */ 772 nd6_ns_input(m, off, icmp6len); 773 m = NULL; 774 goto freeit; 775 } 776 nd6_ns_input(n, off, icmp6len); 777 /* m stays. */ 778 break; 779 780 case ND_NEIGHBOR_ADVERT: 781 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighboradvert); 782 if (code != 0) 783 goto badcode; 784 if (icmp6len < sizeof(struct nd_neighbor_advert)) 785 goto badlen; 786 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 787 /* give up local */ 788 nd6_na_input(m, off, icmp6len); 789 m = NULL; 790 goto freeit; 791 } 792 nd6_na_input(n, off, icmp6len); 793 /* m stays. */ 794 break; 795 796 case ND_REDIRECT: 797 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_redirect); 798 if (code != 0) 799 goto badcode; 800 if (icmp6len < sizeof(struct nd_redirect)) 801 goto badlen; 802 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 803 /* give up local */ 804 icmp6_redirect_input(m, off); 805 m = NULL; 806 goto freeit; 807 } 808 icmp6_redirect_input(n, off); 809 /* m stays. */ 810 break; 811 812 case ICMP6_ROUTER_RENUMBERING: 813 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND && 814 code != ICMP6_ROUTER_RENUMBERING_RESULT) 815 goto badcode; 816 if (icmp6len < sizeof(struct icmp6_router_renum)) 817 goto badlen; 818 break; 819 820 default: 821 nd6log((LOG_DEBUG, 822 "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n", 823 icmp6->icmp6_type, ip6_sprintf(&ip6->ip6_src), 824 ip6_sprintf(&ip6->ip6_dst), 825 m->m_pkthdr.rcvif ? m->m_pkthdr.rcvif->if_index : 0)); 826 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) { 827 /* ICMPv6 error: MUST deliver it by spec... */ 828 code = PRC_NCMDS; 829 /* deliver */ 830 } else { 831 /* ICMPv6 informational: MUST not deliver */ 832 break; 833 } 834 deliver: 835 if (icmp6_notify_error(m, off, icmp6len, code)) { 836 /* In this case, m should've been freed. */ 837 return(IPPROTO_DONE); 838 } 839 break; 840 841 badcode: 842 icmp6stat.icp6s_badcode++; 843 break; 844 845 badlen: 846 icmp6stat.icp6s_badlen++; 847 break; 848 } 849 850 /* deliver the packet to appropriate sockets */ 851 icmp6_rip6_input(&m, *offp); 852 853 return IPPROTO_DONE; 854 855 freeit: 856 m_freem(m); 857 return IPPROTO_DONE; 858 } 859 860 static int 861 icmp6_notify_error(m, off, icmp6len, code) 862 struct mbuf *m; 863 int off, icmp6len; 864 { 865 struct icmp6_hdr *icmp6; 866 struct ip6_hdr *eip6; 867 u_int32_t notifymtu; 868 struct sockaddr_in6 icmp6src, icmp6dst; 869 870 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) { 871 icmp6stat.icp6s_tooshort++; 872 goto freeit; 873 } 874 #ifndef PULLDOWN_TEST 875 IP6_EXTHDR_CHECK(m, off, 876 sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr), 877 -1); 878 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 879 #else 880 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 881 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 882 if (icmp6 == NULL) { 883 icmp6stat.icp6s_tooshort++; 884 return(-1); 885 } 886 #endif 887 eip6 = (struct ip6_hdr *)(icmp6 + 1); 888 889 /* Detect the upper level protocol */ 890 { 891 void (*ctlfunc) __P((int, struct sockaddr *, void *)); 892 u_int8_t nxt = eip6->ip6_nxt; 893 int eoff = off + sizeof(struct icmp6_hdr) + 894 sizeof(struct ip6_hdr); 895 struct ip6ctlparam ip6cp; 896 struct in6_addr *finaldst = NULL; 897 int icmp6type = icmp6->icmp6_type; 898 struct ip6_frag *fh; 899 struct ip6_rthdr *rth; 900 struct ip6_rthdr0 *rth0; 901 int rthlen; 902 903 while (1) { /* XXX: should avoid infinite loop explicitly? */ 904 struct ip6_ext *eh; 905 906 switch (nxt) { 907 case IPPROTO_HOPOPTS: 908 case IPPROTO_DSTOPTS: 909 case IPPROTO_AH: 910 #ifndef PULLDOWN_TEST 911 IP6_EXTHDR_CHECK(m, 0, eoff + 912 sizeof(struct ip6_ext), 913 -1); 914 eh = (struct ip6_ext *)(mtod(m, caddr_t) 915 + eoff); 916 #else 917 IP6_EXTHDR_GET(eh, struct ip6_ext *, m, 918 eoff, sizeof(*eh)); 919 if (eh == NULL) { 920 icmp6stat.icp6s_tooshort++; 921 return(-1); 922 } 923 #endif 924 925 if (nxt == IPPROTO_AH) 926 eoff += (eh->ip6e_len + 2) << 2; 927 else 928 eoff += (eh->ip6e_len + 1) << 3; 929 nxt = eh->ip6e_nxt; 930 break; 931 case IPPROTO_ROUTING: 932 /* 933 * When the erroneous packet contains a 934 * routing header, we should examine the 935 * header to determine the final destination. 936 * Otherwise, we can't properly update 937 * information that depends on the final 938 * destination (e.g. path MTU). 939 */ 940 #ifndef PULLDOWN_TEST 941 IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(*rth), 942 -1); 943 rth = (struct ip6_rthdr *)(mtod(m, caddr_t) 944 + eoff); 945 #else 946 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m, 947 eoff, sizeof(*rth)); 948 if (rth == NULL) { 949 icmp6stat.icp6s_tooshort++; 950 return(-1); 951 } 952 #endif 953 rthlen = (rth->ip6r_len + 1) << 3; 954 /* 955 * XXX: currently there is no 956 * officially defined type other 957 * than type-0. 958 * Note that if the segment left field 959 * is 0, all intermediate hops must 960 * have been passed. 961 */ 962 if (rth->ip6r_segleft && 963 rth->ip6r_type == IPV6_RTHDR_TYPE_0) { 964 int hops; 965 966 #ifndef PULLDOWN_TEST 967 IP6_EXTHDR_CHECK(m, 0, eoff + rthlen, 968 -1); 969 rth0 = (struct ip6_rthdr0 *)(mtod(m, caddr_t) + eoff); 970 #else 971 IP6_EXTHDR_GET(rth0, 972 struct ip6_rthdr0 *, m, 973 eoff, rthlen); 974 if (rth0 == NULL) { 975 icmp6stat.icp6s_tooshort++; 976 return(-1); 977 } 978 #endif 979 /* just ignore a bogus header */ 980 if ((rth0->ip6r0_len % 2) == 0 && 981 (hops = rth0->ip6r0_len/2)) 982 finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1); 983 } 984 eoff += rthlen; 985 nxt = rth->ip6r_nxt; 986 break; 987 case IPPROTO_FRAGMENT: 988 #ifndef PULLDOWN_TEST 989 IP6_EXTHDR_CHECK(m, 0, eoff + 990 sizeof(struct ip6_frag), 991 -1); 992 fh = (struct ip6_frag *)(mtod(m, caddr_t) 993 + eoff); 994 #else 995 IP6_EXTHDR_GET(fh, struct ip6_frag *, m, 996 eoff, sizeof(*fh)); 997 if (fh == NULL) { 998 icmp6stat.icp6s_tooshort++; 999 return(-1); 1000 } 1001 #endif 1002 /* 1003 * Data after a fragment header is meaningless 1004 * unless it is the first fragment, but 1005 * we'll go to the notify label for path MTU 1006 * discovery. 1007 */ 1008 if (fh->ip6f_offlg & IP6F_OFF_MASK) 1009 goto notify; 1010 1011 eoff += sizeof(struct ip6_frag); 1012 nxt = fh->ip6f_nxt; 1013 break; 1014 default: 1015 /* 1016 * This case includes ESP and the No Next 1017 * Header. In such cases going to the notify 1018 * label does not have any meaning 1019 * (i.e. ctlfunc will be NULL), but we go 1020 * anyway since we might have to update 1021 * path MTU information. 1022 */ 1023 goto notify; 1024 } 1025 } 1026 notify: 1027 #ifndef PULLDOWN_TEST 1028 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 1029 #else 1030 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 1031 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 1032 if (icmp6 == NULL) { 1033 icmp6stat.icp6s_tooshort++; 1034 return(-1); 1035 } 1036 #endif 1037 1038 eip6 = (struct ip6_hdr *)(icmp6 + 1); 1039 bzero(&icmp6dst, sizeof(icmp6dst)); 1040 icmp6dst.sin6_len = sizeof(struct sockaddr_in6); 1041 icmp6dst.sin6_family = AF_INET6; 1042 if (finaldst == NULL) 1043 icmp6dst.sin6_addr = eip6->ip6_dst; 1044 else 1045 icmp6dst.sin6_addr = *finaldst; 1046 icmp6dst.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif, 1047 &icmp6dst.sin6_addr); 1048 #ifndef SCOPEDROUTING 1049 if (in6_embedscope(&icmp6dst.sin6_addr, &icmp6dst, 1050 NULL, NULL)) { 1051 /* should be impossbile */ 1052 nd6log((LOG_DEBUG, 1053 "icmp6_notify_error: in6_embedscope failed\n")); 1054 goto freeit; 1055 } 1056 #endif 1057 1058 /* 1059 * retrieve parameters from the inner IPv6 header, and convert 1060 * them into sockaddr structures. 1061 */ 1062 bzero(&icmp6src, sizeof(icmp6src)); 1063 icmp6src.sin6_len = sizeof(struct sockaddr_in6); 1064 icmp6src.sin6_family = AF_INET6; 1065 icmp6src.sin6_addr = eip6->ip6_src; 1066 icmp6src.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif, 1067 &icmp6src.sin6_addr); 1068 #ifndef SCOPEDROUTING 1069 if (in6_embedscope(&icmp6src.sin6_addr, &icmp6src, 1070 NULL, NULL)) { 1071 /* should be impossbile */ 1072 nd6log((LOG_DEBUG, 1073 "icmp6_notify_error: in6_embedscope failed\n")); 1074 goto freeit; 1075 } 1076 #endif 1077 icmp6src.sin6_flowinfo = 1078 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK); 1079 1080 if (finaldst == NULL) 1081 finaldst = &eip6->ip6_dst; 1082 ip6cp.ip6c_m = m; 1083 ip6cp.ip6c_icmp6 = icmp6; 1084 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1); 1085 ip6cp.ip6c_off = eoff; 1086 ip6cp.ip6c_finaldst = finaldst; 1087 ip6cp.ip6c_src = &icmp6src; 1088 ip6cp.ip6c_nxt = nxt; 1089 1090 if (icmp6type == ICMP6_PACKET_TOO_BIG) { 1091 notifymtu = ntohl(icmp6->icmp6_mtu); 1092 ip6cp.ip6c_cmdarg = (void *)¬ifymtu; 1093 icmp6_mtudisc_update(&ip6cp, 1); /*XXX*/ 1094 } 1095 1096 ctlfunc = (void (*) __P((int, struct sockaddr *, void *))) 1097 (inet6sw[ip6_protox[nxt]].pr_ctlinput); 1098 if (ctlfunc) { 1099 (void) (*ctlfunc)(code, (struct sockaddr *)&icmp6dst, 1100 &ip6cp); 1101 } 1102 } 1103 return(0); 1104 1105 freeit: 1106 m_freem(m); 1107 return(-1); 1108 } 1109 1110 void 1111 icmp6_mtudisc_update(ip6cp, validated) 1112 struct ip6ctlparam *ip6cp; 1113 int validated; 1114 { 1115 struct in6_addr *dst = ip6cp->ip6c_finaldst; 1116 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6; 1117 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */ 1118 u_int mtu = ntohl(icmp6->icmp6_mtu); 1119 struct rtentry *rt = NULL; 1120 struct sockaddr_in6 sin6; 1121 1122 if (!validated) 1123 return; 1124 1125 bzero(&sin6, sizeof(sin6)); 1126 sin6.sin6_family = PF_INET6; 1127 sin6.sin6_len = sizeof(struct sockaddr_in6); 1128 sin6.sin6_addr = *dst; 1129 /* XXX normally, this won't happen */ 1130 if (IN6_IS_ADDR_LINKLOCAL(dst)) { 1131 sin6.sin6_addr.s6_addr16[1] = 1132 htons(m->m_pkthdr.rcvif->if_index); 1133 } 1134 /* sin6.sin6_scope_id = XXX: should be set if DST is a scoped addr */ 1135 rt = rtalloc1((struct sockaddr *)&sin6, 0, 1136 RTF_CLONING | RTF_PRCLONING); 1137 1138 if (rt && (rt->rt_flags & RTF_HOST) 1139 && !(rt->rt_rmx.rmx_locks & RTV_MTU)) { 1140 if (mtu < IPV6_MMTU) { 1141 /* xxx */ 1142 rt->rt_rmx.rmx_locks |= RTV_MTU; 1143 } else if (mtu < rt->rt_ifp->if_mtu && 1144 rt->rt_rmx.rmx_mtu > mtu) { 1145 icmp6stat.icp6s_pmtuchg++; 1146 rt->rt_rmx.rmx_mtu = mtu; 1147 } 1148 } 1149 if (rt) { /* XXX: need braces to avoid conflict with else in RTFREE. */ 1150 RTFREE(rt); 1151 } 1152 } 1153 1154 /* 1155 * Process a Node Information Query packet, based on 1156 * draft-ietf-ipngwg-icmp-name-lookups-07. 1157 * 1158 * Spec incompatibilities: 1159 * - IPv6 Subject address handling 1160 * - IPv4 Subject address handling support missing 1161 * - Proxy reply (answer even if it's not for me) 1162 * - joins NI group address at in6_ifattach() time only, does not cope 1163 * with hostname changes by sethostname(3) 1164 */ 1165 #define hostnamelen strlen(hostname) 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; /* double meaning; ip6_dst and subjectaddr */ 1180 struct sockaddr_in6 sin6_d; /* XXX: we should retrieve this from m_aux */ 1181 struct ip6_hdr *ip6; 1182 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */ 1183 char *subj = NULL; 1184 struct in6_ifaddr *ia6 = NULL; 1185 1186 ip6 = mtod(m, struct ip6_hdr *); 1187 #ifndef PULLDOWN_TEST 1188 ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off); 1189 #else 1190 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6)); 1191 if (ni6 == NULL) { 1192 /* m is already reclaimed */ 1193 return NULL; 1194 } 1195 #endif 1196 1197 /* 1198 * Validate IPv6 destination address. 1199 * 1200 * The Responder must discard the Query without further processing 1201 * unless it is one of the Responder's unicast or anycast addresses, or 1202 * a link-local scope multicast address which the Responder has joined. 1203 * [icmp-name-lookups-07, Section 4.] 1204 */ 1205 bzero(&sin6, sizeof(sin6)); 1206 sin6.sin6_family = AF_INET6; 1207 sin6.sin6_len = sizeof(struct sockaddr_in6); 1208 bcopy(&ip6->ip6_dst, &sin6.sin6_addr, sizeof(sin6.sin6_addr)); 1209 /* XXX scopeid */ 1210 if ((ia6 = (struct in6_ifaddr *)ifa_ifwithaddr((struct sockaddr *)&sin6)) != NULL) { 1211 /* unicast/anycast, fine */ 1212 if ((ia6->ia6_flags & IN6_IFF_TEMPORARY) != 0 && 1213 (icmp6_nodeinfo & 4) == 0) { 1214 nd6log((LOG_DEBUG, "ni6_input: ignore node info to " 1215 "a temporary address in %s:%d", 1216 __FILE__, __LINE__)); 1217 goto bad; 1218 } 1219 } else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr)) 1220 ; /* link-local multicast, fine */ 1221 else 1222 goto bad; 1223 1224 /* validate query Subject field. */ 1225 qtype = ntohs(ni6->ni_qtype); 1226 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo); 1227 switch (qtype) { 1228 case NI_QTYPE_NOOP: 1229 case NI_QTYPE_SUPTYPES: 1230 /* 07 draft */ 1231 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0) 1232 break; 1233 /* FALLTHROUGH */ 1234 case NI_QTYPE_FQDN: 1235 case NI_QTYPE_NODEADDR: 1236 switch (ni6->ni_code) { 1237 case ICMP6_NI_SUBJ_IPV6: 1238 #if ICMP6_NI_SUBJ_IPV6 != 0 1239 case 0: 1240 #endif 1241 /* 1242 * backward compatibility - try to accept 03 draft 1243 * format, where no Subject is present. 1244 */ 1245 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 && 1246 subjlen == 0) { 1247 oldfqdn++; 1248 break; 1249 } 1250 #if ICMP6_NI_SUBJ_IPV6 != 0 1251 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6) 1252 goto bad; 1253 #endif 1254 1255 if (subjlen != sizeof(sin6.sin6_addr)) 1256 goto bad; 1257 1258 /* 1259 * Validate Subject address. 1260 * 1261 * Not sure what exactly "address belongs to the node" 1262 * means in the spec, is it just unicast, or what? 1263 * 1264 * At this moment we consider Subject address as 1265 * "belong to the node" if the Subject address equals 1266 * to the IPv6 destination address; validation for 1267 * IPv6 destination address should have done enough 1268 * check for us. 1269 * 1270 * We do not do proxy at this moment. 1271 */ 1272 /* m_pulldown instead of copy? */ 1273 m_copydata(m, off + sizeof(struct icmp6_nodeinfo), 1274 subjlen, (caddr_t)&sin6.sin6_addr); 1275 sin6.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif, 1276 &sin6.sin6_addr); 1277 #ifndef SCOPEDROUTING 1278 in6_embedscope(&sin6.sin6_addr, &sin6, NULL, NULL); 1279 #endif 1280 bzero(&sin6_d, sizeof(sin6_d)); 1281 sin6_d.sin6_family = AF_INET6; /* not used, actually */ 1282 sin6_d.sin6_len = sizeof(sin6_d); /* ditto */ 1283 sin6_d.sin6_addr = ip6->ip6_dst; 1284 sin6_d.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif, 1285 &ip6->ip6_dst); 1286 #ifndef SCOPEDROUTING 1287 in6_embedscope(&sin6_d.sin6_addr, &sin6_d, NULL, NULL); 1288 #endif 1289 subj = (char *)&sin6; 1290 if (SA6_ARE_ADDR_EQUAL(&sin6, &sin6_d)) 1291 break; 1292 1293 /* 1294 * XXX if we are to allow other cases, we should really 1295 * be careful about scope here. 1296 * basically, we should disallow queries toward IPv6 1297 * destination X with subject Y, if scope(X) > scope(Y). 1298 * if we allow scope(X) > scope(Y), it will result in 1299 * information leakage across scope boundary. 1300 */ 1301 goto bad; 1302 1303 case ICMP6_NI_SUBJ_FQDN: 1304 /* 1305 * Validate Subject name with gethostname(3). 1306 * 1307 * The behavior may need some debate, since: 1308 * - we are not sure if the node has FQDN as 1309 * hostname (returned by gethostname(3)). 1310 * - the code does wildcard match for truncated names. 1311 * however, we are not sure if we want to perform 1312 * wildcard match, if gethostname(3) side has 1313 * truncated hostname. 1314 */ 1315 n = ni6_nametodns(hostname, hostnamelen, 0); 1316 if (!n || n->m_next || n->m_len == 0) 1317 goto bad; 1318 IP6_EXTHDR_GET(subj, char *, m, 1319 off + sizeof(struct icmp6_nodeinfo), subjlen); 1320 if (subj == NULL) 1321 goto bad; 1322 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *), 1323 n->m_len)) { 1324 goto bad; 1325 } 1326 m_freem(n); 1327 n = NULL; 1328 break; 1329 1330 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */ 1331 default: 1332 goto bad; 1333 } 1334 break; 1335 } 1336 1337 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */ 1338 switch (qtype) { 1339 case NI_QTYPE_FQDN: 1340 if ((icmp6_nodeinfo & 1) == 0) 1341 goto bad; 1342 break; 1343 case NI_QTYPE_NODEADDR: 1344 if ((icmp6_nodeinfo & 2) == 0) 1345 goto bad; 1346 break; 1347 } 1348 1349 /* guess reply length */ 1350 switch (qtype) { 1351 case NI_QTYPE_NOOP: 1352 break; /* no reply data */ 1353 case NI_QTYPE_SUPTYPES: 1354 replylen += sizeof(u_int32_t); 1355 break; 1356 case NI_QTYPE_FQDN: 1357 /* XXX will append an mbuf */ 1358 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1359 break; 1360 case NI_QTYPE_NODEADDR: 1361 addrs = ni6_addrs(ni6, m, &ifp, subj); 1362 if ((replylen += addrs * (sizeof(struct in6_addr) + 1363 sizeof(u_int32_t))) > MCLBYTES) 1364 replylen = MCLBYTES; /* XXX: will truncate pkt later */ 1365 break; 1366 default: 1367 /* 1368 * XXX: We must return a reply with the ICMP6 code 1369 * `unknown Qtype' in this case. However we regard the case 1370 * as an FQDN query for backward compatibility. 1371 * Older versions set a random value to this field, 1372 * so it rarely varies in the defined qtypes. 1373 * But the mechanism is not reliable... 1374 * maybe we should obsolete older versions. 1375 */ 1376 qtype = NI_QTYPE_FQDN; 1377 /* XXX will append an mbuf */ 1378 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1379 oldfqdn++; 1380 break; 1381 } 1382 1383 /* allocate an mbuf to reply. */ 1384 MGETHDR(n, M_DONTWAIT, m->m_type); 1385 if (n == NULL) { 1386 m_freem(m); 1387 return(NULL); 1388 } 1389 M_COPY_PKTHDR(n, m); /* just for recvif */ 1390 if (replylen > MHLEN) { 1391 if (replylen > MCLBYTES) { 1392 /* 1393 * XXX: should we try to allocate more? But MCLBYTES 1394 * is probably much larger than IPV6_MMTU... 1395 */ 1396 goto bad; 1397 } 1398 MCLGET(n, M_DONTWAIT); 1399 if ((n->m_flags & M_EXT) == 0) { 1400 goto bad; 1401 } 1402 } 1403 n->m_pkthdr.len = n->m_len = replylen; 1404 1405 /* copy mbuf header and IPv6 + Node Information base headers */ 1406 bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr)); 1407 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1); 1408 bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo)); 1409 1410 /* qtype dependent procedure */ 1411 switch (qtype) { 1412 case NI_QTYPE_NOOP: 1413 nni6->ni_code = ICMP6_NI_SUCCESS; 1414 nni6->ni_flags = 0; 1415 break; 1416 case NI_QTYPE_SUPTYPES: 1417 { 1418 u_int32_t v; 1419 nni6->ni_code = ICMP6_NI_SUCCESS; 1420 nni6->ni_flags = htons(0x0000); /* raw bitmap */ 1421 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */ 1422 v = (u_int32_t)htonl(0x0000000f); 1423 bcopy(&v, nni6 + 1, sizeof(u_int32_t)); 1424 break; 1425 } 1426 case NI_QTYPE_FQDN: 1427 nni6->ni_code = ICMP6_NI_SUCCESS; 1428 fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) + 1429 sizeof(struct ip6_hdr) + 1430 sizeof(struct icmp6_nodeinfo)); 1431 nni6->ni_flags = 0; /* XXX: meaningless TTL */ 1432 fqdn->ni_fqdn_ttl = 0; /* ditto. */ 1433 /* 1434 * XXX do we really have FQDN in variable "hostname"? 1435 */ 1436 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn); 1437 if (n->m_next == NULL) 1438 goto bad; 1439 /* XXX we assume that n->m_next is not a chain */ 1440 if (n->m_next->m_next != NULL) 1441 goto bad; 1442 n->m_pkthdr.len += n->m_next->m_len; 1443 break; 1444 case NI_QTYPE_NODEADDR: 1445 { 1446 int lenlim, copied; 1447 1448 nni6->ni_code = ICMP6_NI_SUCCESS; 1449 n->m_pkthdr.len = n->m_len = 1450 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1451 lenlim = M_TRAILINGSPACE(n); 1452 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim); 1453 /* XXX: reset mbuf length */ 1454 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 1455 sizeof(struct icmp6_nodeinfo) + copied; 1456 break; 1457 } 1458 default: 1459 break; /* XXX impossible! */ 1460 } 1461 1462 nni6->ni_type = ICMP6_NI_REPLY; 1463 m_freem(m); 1464 return(n); 1465 1466 bad: 1467 m_freem(m); 1468 if (n) 1469 m_freem(n); 1470 return(NULL); 1471 } 1472 #undef hostnamelen 1473 1474 /* 1475 * make a mbuf with DNS-encoded string. no compression support. 1476 * 1477 * XXX names with less than 2 dots (like "foo" or "foo.section") will be 1478 * treated as truncated name (two \0 at the end). this is a wild guess. 1479 */ 1480 static struct mbuf * 1481 ni6_nametodns(name, namelen, old) 1482 const char *name; 1483 int namelen; 1484 int old; /* return pascal string if non-zero */ 1485 { 1486 struct mbuf *m; 1487 char *cp, *ep; 1488 const char *p, *q; 1489 int i, len, nterm; 1490 1491 if (old) 1492 len = namelen + 1; 1493 else 1494 len = MCLBYTES; 1495 1496 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */ 1497 MGET(m, M_DONTWAIT, MT_DATA); 1498 if (m && len > MLEN) { 1499 MCLGET(m, M_DONTWAIT); 1500 if ((m->m_flags & M_EXT) == 0) 1501 goto fail; 1502 } 1503 if (!m) 1504 goto fail; 1505 m->m_next = NULL; 1506 1507 if (old) { 1508 m->m_len = len; 1509 *mtod(m, char *) = namelen; 1510 bcopy(name, mtod(m, char *) + 1, namelen); 1511 return m; 1512 } else { 1513 m->m_len = 0; 1514 cp = mtod(m, char *); 1515 ep = mtod(m, char *) + M_TRAILINGSPACE(m); 1516 1517 /* if not certain about my name, return empty buffer */ 1518 if (namelen == 0) 1519 return m; 1520 1521 /* 1522 * guess if it looks like shortened hostname, or FQDN. 1523 * shortened hostname needs two trailing "\0". 1524 */ 1525 i = 0; 1526 for (p = name; p < name + namelen; p++) { 1527 if (*p && *p == '.') 1528 i++; 1529 } 1530 if (i < 2) 1531 nterm = 2; 1532 else 1533 nterm = 1; 1534 1535 p = name; 1536 while (cp < ep && p < name + namelen) { 1537 i = 0; 1538 for (q = p; q < name + namelen && *q && *q != '.'; q++) 1539 i++; 1540 /* result does not fit into mbuf */ 1541 if (cp + i + 1 >= ep) 1542 goto fail; 1543 /* 1544 * DNS label length restriction, RFC1035 page 8. 1545 * "i == 0" case is included here to avoid returning 1546 * 0-length label on "foo..bar". 1547 */ 1548 if (i <= 0 || i >= 64) 1549 goto fail; 1550 *cp++ = i; 1551 bcopy(p, cp, i); 1552 cp += i; 1553 p = q; 1554 if (p < name + namelen && *p == '.') 1555 p++; 1556 } 1557 /* termination */ 1558 if (cp + nterm >= ep) 1559 goto fail; 1560 while (nterm-- > 0) 1561 *cp++ = '\0'; 1562 m->m_len = cp - mtod(m, char *); 1563 return m; 1564 } 1565 1566 panic("should not reach here"); 1567 /* NOTREACHED */ 1568 1569 fail: 1570 if (m) 1571 m_freem(m); 1572 return NULL; 1573 } 1574 1575 /* 1576 * check if two DNS-encoded string matches. takes care of truncated 1577 * form (with \0\0 at the end). no compression support. 1578 * XXX upper/lowercase match (see RFC2065) 1579 */ 1580 static int 1581 ni6_dnsmatch(a, alen, b, blen) 1582 const char *a; 1583 int alen; 1584 const char *b; 1585 int blen; 1586 { 1587 const char *a0, *b0; 1588 int l; 1589 1590 /* simplest case - need validation? */ 1591 if (alen == blen && bcmp(a, b, alen) == 0) 1592 return 1; 1593 1594 a0 = a; 1595 b0 = b; 1596 1597 /* termination is mandatory */ 1598 if (alen < 2 || blen < 2) 1599 return 0; 1600 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0') 1601 return 0; 1602 alen--; 1603 blen--; 1604 1605 while (a - a0 < alen && b - b0 < blen) { 1606 if (a - a0 + 1 > alen || b - b0 + 1 > blen) 1607 return 0; 1608 1609 if ((signed char)a[0] < 0 || (signed char)b[0] < 0) 1610 return 0; 1611 /* we don't support compression yet */ 1612 if (a[0] >= 64 || b[0] >= 64) 1613 return 0; 1614 1615 /* truncated case */ 1616 if (a[0] == 0 && a - a0 == alen - 1) 1617 return 1; 1618 if (b[0] == 0 && b - b0 == blen - 1) 1619 return 1; 1620 if (a[0] == 0 || b[0] == 0) 1621 return 0; 1622 1623 if (a[0] != b[0]) 1624 return 0; 1625 l = a[0]; 1626 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen) 1627 return 0; 1628 if (bcmp(a + 1, b + 1, l) != 0) 1629 return 0; 1630 1631 a += 1 + l; 1632 b += 1 + l; 1633 } 1634 1635 if (a - a0 == alen && b - b0 == blen) 1636 return 1; 1637 else 1638 return 0; 1639 } 1640 1641 /* 1642 * calculate the number of addresses to be returned in the node info reply. 1643 */ 1644 static int 1645 ni6_addrs(ni6, m, ifpp, subj) 1646 struct icmp6_nodeinfo *ni6; 1647 struct mbuf *m; 1648 struct ifnet **ifpp; 1649 char *subj; 1650 { 1651 struct ifnet *ifp; 1652 struct in6_ifaddr *ifa6; 1653 struct ifaddr *ifa; 1654 struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */ 1655 int addrs = 0, addrsofif, iffound = 0; 1656 int niflags = ni6->ni_flags; 1657 1658 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) { 1659 switch (ni6->ni_code) { 1660 case ICMP6_NI_SUBJ_IPV6: 1661 if (subj == NULL) /* must be impossible... */ 1662 return(0); 1663 subj_ip6 = (struct sockaddr_in6 *)subj; 1664 break; 1665 default: 1666 /* 1667 * XXX: we only support IPv6 subject address for 1668 * this Qtype. 1669 */ 1670 return(0); 1671 } 1672 } 1673 1674 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) 1675 { 1676 addrsofif = 0; 1677 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 1678 { 1679 if (ifa->ifa_addr->sa_family != AF_INET6) 1680 continue; 1681 ifa6 = (struct in6_ifaddr *)ifa; 1682 1683 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 && 1684 IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr, 1685 &ifa6->ia_addr.sin6_addr)) 1686 iffound = 1; 1687 1688 /* 1689 * IPv4-mapped addresses can only be returned by a 1690 * Node Information proxy, since they represent 1691 * addresses of IPv4-only nodes, which perforce do 1692 * not implement this protocol. 1693 * [icmp-name-lookups-07, Section 5.4] 1694 * So we don't support NI_NODEADDR_FLAG_COMPAT in 1695 * this function at this moment. 1696 */ 1697 1698 /* What do we have to do about ::1? */ 1699 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) { 1700 case IPV6_ADDR_SCOPE_LINKLOCAL: 1701 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1702 continue; 1703 break; 1704 case IPV6_ADDR_SCOPE_SITELOCAL: 1705 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1706 continue; 1707 break; 1708 case IPV6_ADDR_SCOPE_GLOBAL: 1709 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1710 continue; 1711 break; 1712 default: 1713 continue; 1714 } 1715 1716 /* 1717 * check if anycast is okay. 1718 * XXX: just experimental. not in the spec. 1719 */ 1720 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1721 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 1722 continue; /* we need only unicast addresses */ 1723 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 && 1724 (icmp6_nodeinfo & 4) == 0) { 1725 continue; 1726 } 1727 addrsofif++; /* count the address */ 1728 } 1729 if (iffound) { 1730 *ifpp = ifp; 1731 return(addrsofif); 1732 } 1733 1734 addrs += addrsofif; 1735 } 1736 1737 return(addrs); 1738 } 1739 1740 static int 1741 ni6_store_addrs(ni6, nni6, ifp0, resid) 1742 struct icmp6_nodeinfo *ni6, *nni6; 1743 struct ifnet *ifp0; 1744 int resid; 1745 { 1746 struct ifnet *ifp = ifp0 ? ifp0 : TAILQ_FIRST(&ifnet); 1747 struct in6_ifaddr *ifa6; 1748 struct ifaddr *ifa; 1749 struct ifnet *ifp_dep = NULL; 1750 int copied = 0, allow_deprecated = 0; 1751 u_char *cp = (u_char *)(nni6 + 1); 1752 int niflags = ni6->ni_flags; 1753 u_int32_t ltime; 1754 1755 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL)) 1756 return(0); /* needless to copy */ 1757 1758 again: 1759 1760 for (; ifp; ifp = TAILQ_NEXT(ifp, if_list)) 1761 { 1762 for (ifa = ifp->if_addrlist.tqh_first; ifa; 1763 ifa = ifa->ifa_list.tqe_next) 1764 { 1765 if (ifa->ifa_addr->sa_family != AF_INET6) 1766 continue; 1767 ifa6 = (struct in6_ifaddr *)ifa; 1768 1769 if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) != 0 && 1770 allow_deprecated == 0) { 1771 /* 1772 * prefererred address should be put before 1773 * deprecated addresses. 1774 */ 1775 1776 /* record the interface for later search */ 1777 if (ifp_dep == NULL) 1778 ifp_dep = ifp; 1779 1780 continue; 1781 } 1782 else if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) == 0 && 1783 allow_deprecated != 0) 1784 continue; /* we now collect deprecated addrs */ 1785 1786 /* What do we have to do about ::1? */ 1787 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) { 1788 case IPV6_ADDR_SCOPE_LINKLOCAL: 1789 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1790 continue; 1791 break; 1792 case IPV6_ADDR_SCOPE_SITELOCAL: 1793 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1794 continue; 1795 break; 1796 case IPV6_ADDR_SCOPE_GLOBAL: 1797 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1798 continue; 1799 break; 1800 default: 1801 continue; 1802 } 1803 1804 /* 1805 * check if anycast is okay. 1806 * XXX: just experimental. not in the spec. 1807 */ 1808 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1809 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 1810 continue; 1811 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 && 1812 (icmp6_nodeinfo & 4) == 0) { 1813 continue; 1814 } 1815 1816 /* now we can copy the address */ 1817 if (resid < sizeof(struct in6_addr) + 1818 sizeof(u_int32_t)) { 1819 /* 1820 * We give up much more copy. 1821 * Set the truncate flag and return. 1822 */ 1823 nni6->ni_flags |= 1824 NI_NODEADDR_FLAG_TRUNCATE; 1825 return(copied); 1826 } 1827 1828 /* 1829 * Set the TTL of the address. 1830 * The TTL value should be one of the following 1831 * according to the specification: 1832 * 1833 * 1. The remaining lifetime of a DHCP lease on the 1834 * address, or 1835 * 2. The remaining Valid Lifetime of a prefix from 1836 * which the address was derived through Stateless 1837 * Autoconfiguration. 1838 * 1839 * Note that we currently do not support stateful 1840 * address configuration by DHCPv6, so the former 1841 * case can't happen. 1842 */ 1843 if (ifa6->ia6_lifetime.ia6t_expire == 0) 1844 ltime = ND6_INFINITE_LIFETIME; 1845 else { 1846 if (ifa6->ia6_lifetime.ia6t_expire > 1847 time_second) 1848 ltime = htonl(ifa6->ia6_lifetime.ia6t_expire - time_second); 1849 else 1850 ltime = 0; 1851 } 1852 1853 bcopy(<ime, cp, sizeof(u_int32_t)); 1854 cp += sizeof(u_int32_t); 1855 1856 /* copy the address itself */ 1857 bcopy(&ifa6->ia_addr.sin6_addr, cp, 1858 sizeof(struct in6_addr)); 1859 /* XXX: KAME link-local hack; remove ifindex */ 1860 if (IN6_IS_ADDR_LINKLOCAL(&ifa6->ia_addr.sin6_addr)) 1861 ((struct in6_addr *)cp)->s6_addr16[1] = 0; 1862 cp += sizeof(struct in6_addr); 1863 1864 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1865 copied += (sizeof(struct in6_addr) + 1866 sizeof(u_int32_t)); 1867 } 1868 if (ifp0) /* we need search only on the specified IF */ 1869 break; 1870 } 1871 1872 if (allow_deprecated == 0 && ifp_dep != NULL) { 1873 ifp = ifp_dep; 1874 allow_deprecated = 1; 1875 1876 goto again; 1877 } 1878 1879 return(copied); 1880 } 1881 1882 /* 1883 * XXX almost dup'ed code with rip6_input. 1884 */ 1885 static int 1886 icmp6_rip6_input(mp, off) 1887 struct mbuf **mp; 1888 int off; 1889 { 1890 struct mbuf *m = *mp; 1891 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1892 struct in6pcb *in6p; 1893 struct in6pcb *last = NULL; 1894 struct sockaddr_in6 rip6src; 1895 struct icmp6_hdr *icmp6; 1896 struct mbuf *opts = NULL; 1897 1898 #ifndef PULLDOWN_TEST 1899 /* this is assumed to be safe. */ 1900 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off); 1901 #else 1902 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 1903 if (icmp6 == NULL) { 1904 /* m is already reclaimed */ 1905 return IPPROTO_DONE; 1906 } 1907 #endif 1908 1909 bzero(&rip6src, sizeof(rip6src)); 1910 rip6src.sin6_len = sizeof(struct sockaddr_in6); 1911 rip6src.sin6_family = AF_INET6; 1912 /* KAME hack: recover scopeid */ 1913 (void)in6_recoverscope(&rip6src, &ip6->ip6_src, m->m_pkthdr.rcvif); 1914 1915 LIST_FOREACH(in6p, &ripcb, inp_list) 1916 { 1917 if ((in6p->inp_vflag & INP_IPV6) == 0) 1918 continue; 1919 #ifdef HAVE_NRL_INPCB 1920 if (!(in6p->in6p_flags & INP_IPV6)) 1921 continue; 1922 #endif 1923 if (in6p->in6p_ip6_nxt != IPPROTO_ICMPV6) 1924 continue; 1925 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && 1926 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst)) 1927 continue; 1928 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) && 1929 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src)) 1930 continue; 1931 if (in6p->in6p_icmp6filt 1932 && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type, 1933 in6p->in6p_icmp6filt)) 1934 continue; 1935 if (last) { 1936 struct mbuf *n; 1937 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { 1938 if (last->in6p_flags & IN6P_CONTROLOPTS) 1939 ip6_savecontrol(last, &opts, ip6, n); 1940 /* strip intermediate headers */ 1941 m_adj(n, off); 1942 if (sbappendaddr(&last->in6p_socket->so_rcv, 1943 (struct sockaddr *)&rip6src, 1944 n, opts) == 0) { 1945 /* should notify about lost packet */ 1946 m_freem(n); 1947 if (opts) { 1948 m_freem(opts); 1949 } 1950 } else 1951 sorwakeup(last->in6p_socket); 1952 opts = NULL; 1953 } 1954 } 1955 last = in6p; 1956 } 1957 if (last) { 1958 if (last->in6p_flags & IN6P_CONTROLOPTS) 1959 ip6_savecontrol(last, &opts, ip6, m); 1960 /* strip intermediate headers */ 1961 m_adj(m, off); 1962 if (sbappendaddr(&last->in6p_socket->so_rcv, 1963 (struct sockaddr *)&rip6src, m, opts) == 0) { 1964 m_freem(m); 1965 if (opts) 1966 m_freem(opts); 1967 } else 1968 sorwakeup(last->in6p_socket); 1969 } else { 1970 m_freem(m); 1971 ip6stat.ip6s_delivered--; 1972 } 1973 return IPPROTO_DONE; 1974 } 1975 1976 /* 1977 * Reflect the ip6 packet back to the source. 1978 * OFF points to the icmp6 header, counted from the top of the mbuf. 1979 */ 1980 void 1981 icmp6_reflect(m, off) 1982 struct mbuf *m; 1983 size_t off; 1984 { 1985 struct ip6_hdr *ip6; 1986 struct icmp6_hdr *icmp6; 1987 struct in6_ifaddr *ia; 1988 struct in6_addr t, *src = 0; 1989 int plen; 1990 int type, code; 1991 struct ifnet *outif = NULL; 1992 struct sockaddr_in6 sa6_src, sa6_dst; 1993 #ifdef COMPAT_RFC1885 1994 int mtu = IPV6_MMTU; 1995 struct sockaddr_in6 *sin6 = &icmp6_reflect_rt.ro_dst; 1996 #endif 1997 1998 /* too short to reflect */ 1999 if (off < sizeof(struct ip6_hdr)) { 2000 nd6log((LOG_DEBUG, 2001 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n", 2002 (u_long)off, (u_long)sizeof(struct ip6_hdr), 2003 __FILE__, __LINE__)); 2004 goto bad; 2005 } 2006 2007 /* 2008 * If there are extra headers between IPv6 and ICMPv6, strip 2009 * off that header first. 2010 */ 2011 #ifdef DIAGNOSTIC 2012 if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN) 2013 panic("assumption failed in icmp6_reflect"); 2014 #endif 2015 if (off > sizeof(struct ip6_hdr)) { 2016 size_t l; 2017 struct ip6_hdr nip6; 2018 2019 l = off - sizeof(struct ip6_hdr); 2020 m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6); 2021 m_adj(m, 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 bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6)); 2028 } else /* off == sizeof(struct ip6_hdr) */ { 2029 size_t l; 2030 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2031 if (m->m_len < l) { 2032 if ((m = m_pullup(m, l)) == NULL) 2033 return; 2034 } 2035 } 2036 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr); 2037 ip6 = mtod(m, struct ip6_hdr *); 2038 ip6->ip6_nxt = IPPROTO_ICMPV6; 2039 icmp6 = (struct icmp6_hdr *)(ip6 + 1); 2040 type = icmp6->icmp6_type; /* keep type for statistics */ 2041 code = icmp6->icmp6_code; /* ditto. */ 2042 2043 t = ip6->ip6_dst; 2044 /* 2045 * ip6_input() drops a packet if its src is multicast. 2046 * So, the src is never multicast. 2047 */ 2048 ip6->ip6_dst = ip6->ip6_src; 2049 2050 /* 2051 * XXX: make sure to embed scope zone information, using 2052 * already embedded IDs or the received interface (if any). 2053 * Note that rcvif may be NULL. 2054 * TODO: scoped routing case (XXX). 2055 */ 2056 bzero(&sa6_src, sizeof(sa6_src)); 2057 sa6_src.sin6_family = AF_INET6; 2058 sa6_src.sin6_len = sizeof(sa6_src); 2059 sa6_src.sin6_addr = ip6->ip6_dst; 2060 in6_recoverscope(&sa6_src, &ip6->ip6_dst, m->m_pkthdr.rcvif); 2061 in6_embedscope(&ip6->ip6_dst, &sa6_src, NULL, NULL); 2062 bzero(&sa6_dst, sizeof(sa6_dst)); 2063 sa6_dst.sin6_family = AF_INET6; 2064 sa6_dst.sin6_len = sizeof(sa6_dst); 2065 sa6_dst.sin6_addr = t; 2066 in6_recoverscope(&sa6_dst, &t, m->m_pkthdr.rcvif); 2067 in6_embedscope(&t, &sa6_dst, NULL, NULL); 2068 2069 #ifdef COMPAT_RFC1885 2070 /* 2071 * xxx guess MTU 2072 * RFC 1885 requires that echo reply should be truncated if it 2073 * does not fit in with (return) path MTU, but the description was 2074 * removed in the new spec. 2075 */ 2076 if (icmp6_reflect_rt.ro_rt == 0 || 2077 ! (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &ip6->ip6_dst))) { 2078 if (icmp6_reflect_rt.ro_rt) { 2079 RTFREE(icmp6_reflect_rt.ro_rt); 2080 icmp6_reflect_rt.ro_rt = 0; 2081 } 2082 bzero(sin6, sizeof(*sin6)); 2083 sin6->sin6_family = PF_INET6; 2084 sin6->sin6_len = sizeof(struct sockaddr_in6); 2085 sin6->sin6_addr = ip6->ip6_dst; 2086 2087 rtalloc_ign((struct route *)&icmp6_reflect_rt.ro_rt, 2088 RTF_PRCLONING); 2089 } 2090 2091 if (icmp6_reflect_rt.ro_rt == 0) 2092 goto bad; 2093 2094 if ((icmp6_reflect_rt.ro_rt->rt_flags & RTF_HOST) 2095 && mtu < icmp6_reflect_rt.ro_rt->rt_ifp->if_mtu) 2096 mtu = icmp6_reflect_rt.ro_rt->rt_rmx.rmx_mtu; 2097 2098 if (mtu < m->m_pkthdr.len) { 2099 plen -= (m->m_pkthdr.len - mtu); 2100 m_adj(m, mtu - m->m_pkthdr.len); 2101 } 2102 #endif 2103 /* 2104 * If the incoming packet was addressed directly to us(i.e. unicast), 2105 * use dst as the src for the reply. 2106 * The IN6_IFF_NOTREADY case would be VERY rare, but is possible 2107 * (for example) when we encounter an error while forwarding procedure 2108 * destined to a duplicated address of ours. 2109 */ 2110 for (ia = in6_ifaddr; ia; ia = ia->ia_next) 2111 if (IN6_ARE_ADDR_EQUAL(&t, &ia->ia_addr.sin6_addr) && 2112 (ia->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) { 2113 src = &t; 2114 break; 2115 } 2116 if (ia == NULL && IN6_IS_ADDR_LINKLOCAL(&t) && (m->m_flags & M_LOOP)) { 2117 /* 2118 * This is the case if the dst is our link-local address 2119 * and the sender is also ourselves. 2120 */ 2121 src = &t; 2122 } 2123 2124 if (src == 0) { 2125 int e; 2126 struct route_in6 ro; 2127 2128 /* 2129 * This case matches to multicasts, our anycast, or unicasts 2130 * that we do not own. Select a source address based on the 2131 * source address of the erroneous packet. 2132 */ 2133 bzero(&ro, sizeof(ro)); 2134 src = in6_selectsrc(&sa6_src, NULL, NULL, &ro, NULL, &e); 2135 if (ro.ro_rt) 2136 RTFREE(ro.ro_rt); /* XXX: we could use this */ 2137 if (src == NULL) { 2138 nd6log((LOG_DEBUG, 2139 "icmp6_reflect: source can't be determined: " 2140 "dst=%s, error=%d\n", 2141 ip6_sprintf(&sa6_src.sin6_addr), e)); 2142 goto bad; 2143 } 2144 } 2145 2146 ip6->ip6_src = *src; 2147 2148 ip6->ip6_flow = 0; 2149 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2150 ip6->ip6_vfc |= IPV6_VERSION; 2151 ip6->ip6_nxt = IPPROTO_ICMPV6; 2152 if (m->m_pkthdr.rcvif) { 2153 /* XXX: This may not be the outgoing interface */ 2154 ip6->ip6_hlim = nd_ifinfo[m->m_pkthdr.rcvif->if_index].chlim; 2155 } else 2156 ip6->ip6_hlim = ip6_defhlim; 2157 2158 icmp6->icmp6_cksum = 0; 2159 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6, 2160 sizeof(struct ip6_hdr), plen); 2161 2162 /* 2163 * XXX option handling 2164 */ 2165 2166 m->m_flags &= ~(M_BCAST|M_MCAST); 2167 2168 #ifdef COMPAT_RFC1885 2169 ip6_output(m, NULL, &icmp6_reflect_rt, 0, NULL, &outif, NULL); 2170 #else 2171 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL); 2172 #endif 2173 if (outif) 2174 icmp6_ifoutstat_inc(outif, type, code); 2175 2176 return; 2177 2178 bad: 2179 m_freem(m); 2180 return; 2181 } 2182 2183 void 2184 icmp6_fasttimo() 2185 { 2186 2187 mld6_fasttimeo(); 2188 } 2189 2190 static const char * 2191 icmp6_redirect_diag(src6, dst6, tgt6) 2192 struct in6_addr *src6; 2193 struct in6_addr *dst6; 2194 struct in6_addr *tgt6; 2195 { 2196 static char buf[1024]; 2197 snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)", 2198 ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6)); 2199 return buf; 2200 } 2201 2202 void 2203 icmp6_redirect_input(m, off) 2204 struct mbuf *m; 2205 int off; 2206 { 2207 struct ifnet *ifp = m->m_pkthdr.rcvif; 2208 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 2209 struct nd_redirect *nd_rd; 2210 int icmp6len = ntohs(ip6->ip6_plen); 2211 char *lladdr = NULL; 2212 int lladdrlen = 0; 2213 u_char *redirhdr = NULL; 2214 int redirhdrlen = 0; 2215 struct rtentry *rt = NULL; 2216 int is_router; 2217 int is_onlink; 2218 struct in6_addr src6 = ip6->ip6_src; 2219 struct in6_addr redtgt6; 2220 struct in6_addr reddst6; 2221 union nd_opts ndopts; 2222 2223 if (!m || !ifp) 2224 return; 2225 2226 /* XXX if we are router, we don't update route by icmp6 redirect */ 2227 if (ip6_forwarding) 2228 goto freeit; 2229 if (!icmp6_rediraccept) 2230 goto freeit; 2231 2232 #ifndef PULLDOWN_TEST 2233 IP6_EXTHDR_CHECK(m, off, icmp6len,); 2234 nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off); 2235 #else 2236 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len); 2237 if (nd_rd == NULL) { 2238 icmp6stat.icp6s_tooshort++; 2239 return; 2240 } 2241 #endif 2242 redtgt6 = nd_rd->nd_rd_target; 2243 reddst6 = nd_rd->nd_rd_dst; 2244 2245 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 2246 redtgt6.s6_addr16[1] = htons(ifp->if_index); 2247 if (IN6_IS_ADDR_LINKLOCAL(&reddst6)) 2248 reddst6.s6_addr16[1] = htons(ifp->if_index); 2249 2250 /* validation */ 2251 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) { 2252 nd6log((LOG_ERR, 2253 "ICMP6 redirect sent from %s rejected; " 2254 "must be from linklocal\n", ip6_sprintf(&src6))); 2255 goto bad; 2256 } 2257 if (ip6->ip6_hlim != 255) { 2258 nd6log((LOG_ERR, 2259 "ICMP6 redirect sent from %s rejected; " 2260 "hlim=%d (must be 255)\n", 2261 ip6_sprintf(&src6), ip6->ip6_hlim)); 2262 goto bad; 2263 } 2264 { 2265 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */ 2266 struct sockaddr_in6 sin6; 2267 struct in6_addr *gw6; 2268 2269 bzero(&sin6, sizeof(sin6)); 2270 sin6.sin6_family = AF_INET6; 2271 sin6.sin6_len = sizeof(struct sockaddr_in6); 2272 bcopy(&reddst6, &sin6.sin6_addr, sizeof(reddst6)); 2273 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL); 2274 if (rt) { 2275 if (rt->rt_gateway == NULL || 2276 rt->rt_gateway->sa_family != AF_INET6) { 2277 nd6log((LOG_ERR, 2278 "ICMP6 redirect rejected; no route " 2279 "with inet6 gateway found for redirect dst: %s\n", 2280 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2281 RTFREE(rt); 2282 goto bad; 2283 } 2284 2285 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr); 2286 if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) { 2287 nd6log((LOG_ERR, 2288 "ICMP6 redirect rejected; " 2289 "not equal to gw-for-src=%s (must be same): " 2290 "%s\n", 2291 ip6_sprintf(gw6), 2292 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2293 RTFREE(rt); 2294 goto bad; 2295 } 2296 } else { 2297 nd6log((LOG_ERR, 2298 "ICMP6 redirect rejected; " 2299 "no route found for redirect dst: %s\n", 2300 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2301 goto bad; 2302 } 2303 RTFREE(rt); 2304 rt = NULL; 2305 } 2306 if (IN6_IS_ADDR_MULTICAST(&reddst6)) { 2307 nd6log((LOG_ERR, 2308 "ICMP6 redirect rejected; " 2309 "redirect dst must be unicast: %s\n", 2310 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2311 goto bad; 2312 } 2313 2314 is_router = is_onlink = 0; 2315 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 2316 is_router = 1; /* router case */ 2317 if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0) 2318 is_onlink = 1; /* on-link destination case */ 2319 if (!is_router && !is_onlink) { 2320 nd6log((LOG_ERR, 2321 "ICMP6 redirect rejected; " 2322 "neither router case nor onlink case: %s\n", 2323 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2324 goto bad; 2325 } 2326 /* validation passed */ 2327 2328 icmp6len -= sizeof(*nd_rd); 2329 nd6_option_init(nd_rd + 1, icmp6len, &ndopts); 2330 if (nd6_options(&ndopts) < 0) { 2331 nd6log((LOG_INFO, "icmp6_redirect_input: " 2332 "invalid ND option, rejected: %s\n", 2333 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2334 /* nd6_options have incremented stats */ 2335 goto freeit; 2336 } 2337 2338 if (ndopts.nd_opts_tgt_lladdr) { 2339 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 2340 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 2341 } 2342 2343 if (ndopts.nd_opts_rh) { 2344 redirhdrlen = ndopts.nd_opts_rh->nd_opt_rh_len; 2345 redirhdr = (u_char *)(ndopts.nd_opts_rh + 1); /* xxx */ 2346 } 2347 2348 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 2349 nd6log((LOG_INFO, 2350 "icmp6_redirect_input: lladdrlen mismatch for %s " 2351 "(if %d, icmp6 packet %d): %s\n", 2352 ip6_sprintf(&redtgt6), ifp->if_addrlen, lladdrlen - 2, 2353 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2354 goto bad; 2355 } 2356 2357 /* RFC 2461 8.3 */ 2358 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT, 2359 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER); 2360 2361 if (!is_onlink) { /* better router case. perform rtredirect. */ 2362 /* perform rtredirect */ 2363 struct sockaddr_in6 sdst; 2364 struct sockaddr_in6 sgw; 2365 struct sockaddr_in6 ssrc; 2366 2367 bzero(&sdst, sizeof(sdst)); 2368 bzero(&sgw, sizeof(sgw)); 2369 bzero(&ssrc, sizeof(ssrc)); 2370 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6; 2371 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len = 2372 sizeof(struct sockaddr_in6); 2373 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr)); 2374 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2375 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr)); 2376 rtredirect((struct sockaddr *)&sdst, (struct sockaddr *)&sgw, 2377 (struct sockaddr *)NULL, RTF_GATEWAY | RTF_HOST, 2378 (struct sockaddr *)&ssrc, 2379 (struct rtentry **)NULL); 2380 } 2381 /* finally update cached route in each socket via pfctlinput */ 2382 { 2383 struct sockaddr_in6 sdst; 2384 2385 bzero(&sdst, sizeof(sdst)); 2386 sdst.sin6_family = AF_INET6; 2387 sdst.sin6_len = sizeof(struct sockaddr_in6); 2388 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2389 pfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst); 2390 #ifdef IPSEC 2391 key_sa_routechange((struct sockaddr *)&sdst); 2392 #endif 2393 } 2394 2395 freeit: 2396 m_freem(m); 2397 return; 2398 2399 bad: 2400 icmp6stat.icp6s_badredirect++; 2401 m_freem(m); 2402 } 2403 2404 void 2405 icmp6_redirect_output(m0, rt) 2406 struct mbuf *m0; 2407 struct rtentry *rt; 2408 { 2409 struct ifnet *ifp; /* my outgoing interface */ 2410 struct in6_addr *ifp_ll6; 2411 struct in6_addr *router_ll6; 2412 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */ 2413 struct mbuf *m = NULL; /* newly allocated one */ 2414 struct ip6_hdr *ip6; /* m as struct ip6_hdr */ 2415 struct nd_redirect *nd_rd; 2416 size_t maxlen; 2417 u_char *p; 2418 struct ifnet *outif = NULL; 2419 struct sockaddr_in6 src_sa; 2420 2421 icmp6_errcount(&icmp6stat.icp6s_outerrhist, ND_REDIRECT, 0); 2422 2423 /* if we are not router, we don't send icmp6 redirect */ 2424 if (!ip6_forwarding || ip6_accept_rtadv) 2425 goto fail; 2426 2427 /* sanity check */ 2428 if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp)) 2429 goto fail; 2430 2431 /* 2432 * Address check: 2433 * the source address must identify a neighbor, and 2434 * the destination address must not be a multicast address 2435 * [RFC 2461, sec 8.2] 2436 */ 2437 sip6 = mtod(m0, struct ip6_hdr *); 2438 bzero(&src_sa, sizeof(src_sa)); 2439 src_sa.sin6_family = AF_INET6; 2440 src_sa.sin6_len = sizeof(src_sa); 2441 src_sa.sin6_addr = sip6->ip6_src; 2442 /* we don't currently use sin6_scope_id, but eventually use it */ 2443 src_sa.sin6_scope_id = in6_addr2scopeid(ifp, &sip6->ip6_src); 2444 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0) 2445 goto fail; 2446 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst)) 2447 goto fail; /* what should we do here? */ 2448 2449 /* rate limit */ 2450 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0)) 2451 goto fail; 2452 2453 /* 2454 * Since we are going to append up to 1280 bytes (= IPV6_MMTU), 2455 * we almost always ask for an mbuf cluster for simplicity. 2456 * (MHLEN < IPV6_MMTU is almost always true) 2457 */ 2458 #if IPV6_MMTU >= MCLBYTES 2459 # error assumption failed about IPV6_MMTU and MCLBYTES 2460 #endif 2461 MGETHDR(m, M_DONTWAIT, MT_HEADER); 2462 if (m && IPV6_MMTU >= MHLEN) 2463 MCLGET(m, M_DONTWAIT); 2464 if (!m) 2465 goto fail; 2466 m->m_pkthdr.rcvif = NULL; 2467 m->m_len = 0; 2468 maxlen = M_TRAILINGSPACE(m); 2469 maxlen = min(IPV6_MMTU, maxlen); 2470 /* just for safety */ 2471 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) + 2472 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) { 2473 goto fail; 2474 } 2475 2476 { 2477 /* get ip6 linklocal address for ifp(my outgoing interface). */ 2478 struct in6_ifaddr *ia; 2479 if ((ia = in6ifa_ifpforlinklocal(ifp, 2480 IN6_IFF_NOTREADY| 2481 IN6_IFF_ANYCAST)) == NULL) 2482 goto fail; 2483 ifp_ll6 = &ia->ia_addr.sin6_addr; 2484 } 2485 2486 /* get ip6 linklocal address for the router. */ 2487 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) { 2488 struct sockaddr_in6 *sin6; 2489 sin6 = (struct sockaddr_in6 *)rt->rt_gateway; 2490 router_ll6 = &sin6->sin6_addr; 2491 if (!IN6_IS_ADDR_LINKLOCAL(router_ll6)) 2492 router_ll6 = (struct in6_addr *)NULL; 2493 } else 2494 router_ll6 = (struct in6_addr *)NULL; 2495 2496 /* ip6 */ 2497 ip6 = mtod(m, struct ip6_hdr *); 2498 ip6->ip6_flow = 0; 2499 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2500 ip6->ip6_vfc |= IPV6_VERSION; 2501 /* ip6->ip6_plen will be set later */ 2502 ip6->ip6_nxt = IPPROTO_ICMPV6; 2503 ip6->ip6_hlim = 255; 2504 /* ip6->ip6_src must be linklocal addr for my outgoing if. */ 2505 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr)); 2506 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr)); 2507 2508 /* ND Redirect */ 2509 nd_rd = (struct nd_redirect *)(ip6 + 1); 2510 nd_rd->nd_rd_type = ND_REDIRECT; 2511 nd_rd->nd_rd_code = 0; 2512 nd_rd->nd_rd_reserved = 0; 2513 if (rt->rt_flags & RTF_GATEWAY) { 2514 /* 2515 * nd_rd->nd_rd_target must be a link-local address in 2516 * better router cases. 2517 */ 2518 if (!router_ll6) 2519 goto fail; 2520 bcopy(router_ll6, &nd_rd->nd_rd_target, 2521 sizeof(nd_rd->nd_rd_target)); 2522 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2523 sizeof(nd_rd->nd_rd_dst)); 2524 } else { 2525 /* make sure redtgt == reddst */ 2526 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target, 2527 sizeof(nd_rd->nd_rd_target)); 2528 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2529 sizeof(nd_rd->nd_rd_dst)); 2530 } 2531 2532 p = (u_char *)(nd_rd + 1); 2533 2534 if (!router_ll6) 2535 goto nolladdropt; 2536 2537 { 2538 /* target lladdr option */ 2539 struct rtentry *rt_router = NULL; 2540 int len; 2541 struct sockaddr_dl *sdl; 2542 struct nd_opt_hdr *nd_opt; 2543 char *lladdr; 2544 2545 rt_router = nd6_lookup(router_ll6, 0, ifp); 2546 if (!rt_router) 2547 goto nolladdropt; 2548 len = sizeof(*nd_opt) + ifp->if_addrlen; 2549 len = (len + 7) & ~7; /* round by 8 */ 2550 /* safety check */ 2551 if (len + (p - (u_char *)ip6) > maxlen) 2552 goto nolladdropt; 2553 if (!(rt_router->rt_flags & RTF_GATEWAY) && 2554 (rt_router->rt_flags & RTF_LLINFO) && 2555 (rt_router->rt_gateway->sa_family == AF_LINK) && 2556 (sdl = (struct sockaddr_dl *)rt_router->rt_gateway) && 2557 sdl->sdl_alen) { 2558 nd_opt = (struct nd_opt_hdr *)p; 2559 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 2560 nd_opt->nd_opt_len = len >> 3; 2561 lladdr = (char *)(nd_opt + 1); 2562 bcopy(LLADDR(sdl), lladdr, ifp->if_addrlen); 2563 p += len; 2564 } 2565 } 2566 nolladdropt:; 2567 2568 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2569 2570 /* just to be safe */ 2571 #ifdef M_DECRYPTED /*not openbsd*/ 2572 if (m0->m_flags & M_DECRYPTED) 2573 goto noredhdropt; 2574 #endif 2575 if (p - (u_char *)ip6 > maxlen) 2576 goto noredhdropt; 2577 2578 { 2579 /* redirected header option */ 2580 int len; 2581 struct nd_opt_rd_hdr *nd_opt_rh; 2582 2583 /* 2584 * compute the maximum size for icmp6 redirect header option. 2585 * XXX room for auth header? 2586 */ 2587 len = maxlen - (p - (u_char *)ip6); 2588 len &= ~7; 2589 2590 /* This is just for simplicity. */ 2591 if (m0->m_pkthdr.len != m0->m_len) { 2592 if (m0->m_next) { 2593 m_freem(m0->m_next); 2594 m0->m_next = NULL; 2595 } 2596 m0->m_pkthdr.len = m0->m_len; 2597 } 2598 2599 /* 2600 * Redirected header option spec (RFC2461 4.6.3) talks nothing 2601 * about padding/truncate rule for the original IP packet. 2602 * From the discussion on IPv6imp in Feb 1999, the consensus was: 2603 * - "attach as much as possible" is the goal 2604 * - pad if not aligned (original size can be guessed by original 2605 * ip6 header) 2606 * Following code adds the padding if it is simple enough, 2607 * and truncates if not. 2608 */ 2609 if (m0->m_next || m0->m_pkthdr.len != m0->m_len) 2610 panic("assumption failed in %s:%d\n", __FILE__, __LINE__); 2611 2612 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) { 2613 /* not enough room, truncate */ 2614 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh); 2615 } else { 2616 /* enough room, pad or truncate */ 2617 size_t extra; 2618 2619 extra = m0->m_pkthdr.len % 8; 2620 if (extra) { 2621 /* pad if easy enough, truncate if not */ 2622 if (8 - extra <= M_TRAILINGSPACE(m0)) { 2623 /* pad */ 2624 m0->m_len += (8 - extra); 2625 m0->m_pkthdr.len += (8 - extra); 2626 } else { 2627 /* truncate */ 2628 m0->m_pkthdr.len -= extra; 2629 m0->m_len -= extra; 2630 } 2631 } 2632 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh); 2633 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh); 2634 } 2635 2636 nd_opt_rh = (struct nd_opt_rd_hdr *)p; 2637 bzero(nd_opt_rh, sizeof(*nd_opt_rh)); 2638 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER; 2639 nd_opt_rh->nd_opt_rh_len = len >> 3; 2640 p += sizeof(*nd_opt_rh); 2641 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2642 2643 /* connect m0 to m */ 2644 m->m_next = m0; 2645 m->m_pkthdr.len = m->m_len + m0->m_len; 2646 } 2647 noredhdropt:; 2648 2649 if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_src)) 2650 sip6->ip6_src.s6_addr16[1] = 0; 2651 if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_dst)) 2652 sip6->ip6_dst.s6_addr16[1] = 0; 2653 #if 0 2654 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src)) 2655 ip6->ip6_src.s6_addr16[1] = 0; 2656 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) 2657 ip6->ip6_dst.s6_addr16[1] = 0; 2658 #endif 2659 if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_target)) 2660 nd_rd->nd_rd_target.s6_addr16[1] = 0; 2661 if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_dst)) 2662 nd_rd->nd_rd_dst.s6_addr16[1] = 0; 2663 2664 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 2665 2666 nd_rd->nd_rd_cksum = 0; 2667 nd_rd->nd_rd_cksum 2668 = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen)); 2669 2670 /* send the packet to outside... */ 2671 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL); 2672 if (outif) { 2673 icmp6_ifstat_inc(outif, ifs6_out_msg); 2674 icmp6_ifstat_inc(outif, ifs6_out_redirect); 2675 } 2676 icmp6stat.icp6s_outhist[ND_REDIRECT]++; 2677 2678 return; 2679 2680 fail: 2681 if (m) 2682 m_freem(m); 2683 if (m0) 2684 m_freem(m0); 2685 } 2686 2687 #ifdef HAVE_NRL_INPCB 2688 #define sotoin6pcb sotoinpcb 2689 #define in6pcb inpcb 2690 #define in6p_icmp6filt inp_icmp6filt 2691 #endif 2692 /* 2693 * ICMPv6 socket option processing. 2694 */ 2695 int 2696 icmp6_ctloutput(so, sopt) 2697 struct socket *so; 2698 struct sockopt *sopt; 2699 { 2700 int error = 0; 2701 int optlen; 2702 struct inpcb *inp = sotoinpcb(so); 2703 int level, op, optname; 2704 2705 if (sopt) { 2706 level = sopt->sopt_level; 2707 op = sopt->sopt_dir; 2708 optname = sopt->sopt_name; 2709 optlen = sopt->sopt_valsize; 2710 } else 2711 level = op = optname = optlen = 0; 2712 2713 if (level != IPPROTO_ICMPV6) { 2714 return EINVAL; 2715 } 2716 2717 switch (op) { 2718 case PRCO_SETOPT: 2719 switch (optname) { 2720 case ICMP6_FILTER: 2721 { 2722 struct icmp6_filter *p; 2723 2724 if (optlen != sizeof(*p)) { 2725 error = EMSGSIZE; 2726 break; 2727 } 2728 if (inp->in6p_icmp6filt == NULL) { 2729 error = EINVAL; 2730 break; 2731 } 2732 error = sooptcopyin(sopt, inp->in6p_icmp6filt, optlen, 2733 optlen); 2734 break; 2735 } 2736 2737 default: 2738 error = ENOPROTOOPT; 2739 break; 2740 } 2741 break; 2742 2743 case PRCO_GETOPT: 2744 switch (optname) { 2745 case ICMP6_FILTER: 2746 { 2747 if (inp->in6p_icmp6filt == NULL) { 2748 error = EINVAL; 2749 break; 2750 } 2751 error = sooptcopyout(sopt, inp->in6p_icmp6filt, 2752 sizeof(struct icmp6_filter)); 2753 break; 2754 } 2755 2756 default: 2757 error = ENOPROTOOPT; 2758 break; 2759 } 2760 break; 2761 } 2762 2763 return(error); 2764 } 2765 #ifdef HAVE_NRL_INPCB 2766 #undef sotoin6pcb 2767 #undef in6pcb 2768 #undef in6p_icmp6filt 2769 #endif 2770 2771 #ifndef HAVE_PPSRATECHECK 2772 #ifndef timersub 2773 #define timersub(tvp, uvp, vvp) \ 2774 do { \ 2775 (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec; \ 2776 (vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec; \ 2777 if ((vvp)->tv_usec < 0) { \ 2778 (vvp)->tv_sec--; \ 2779 (vvp)->tv_usec += 1000000; \ 2780 } \ 2781 } while (0) 2782 #endif 2783 2784 /* 2785 * ppsratecheck(): packets (or events) per second limitation. 2786 */ 2787 static int 2788 ppsratecheck(lasttime, curpps, maxpps) 2789 struct timeval *lasttime; 2790 int *curpps; 2791 int maxpps; /* maximum pps allowed */ 2792 { 2793 struct timeval tv, delta; 2794 int s, rv; 2795 2796 s = splclock(); 2797 microtime(&tv); 2798 splx(s); 2799 2800 timersub(&tv, lasttime, &delta); 2801 2802 /* 2803 * Check for 0,0 so that the message will be seen at least once. 2804 * If more than one second has passed since the last update of 2805 * lasttime, reset the counter. 2806 * 2807 * We do increment *curpps even in *curpps < maxpps case, as some may 2808 * try to use *curpps for stat purposes as well. 2809 */ 2810 if ((lasttime->tv_sec == 0 && lasttime->tv_usec == 0) || 2811 delta.tv_sec >= 1) { 2812 *lasttime = tv; 2813 *curpps = 0; 2814 rv = 1; 2815 } else if (maxpps < 0) 2816 rv = 1; 2817 else if (*curpps < maxpps) 2818 rv = 1; 2819 else 2820 rv = 0; 2821 2822 #if 1 /* DIAGNOSTIC? */ 2823 /* be careful about wrap-around */ 2824 if (*curpps + 1 > *curpps) 2825 *curpps = *curpps + 1; 2826 #else 2827 /* 2828 * assume that there's not too many calls to this function. 2829 * not sure if the assumption holds, as it depends on *caller's* 2830 * behavior, not the behavior of this function. 2831 * IMHO it is wrong to make assumption on the caller's behavior, 2832 * so the above #if is #if 1, not #ifdef DIAGNOSTIC. 2833 */ 2834 *curpps = *curpps + 1; 2835 #endif 2836 2837 return (rv); 2838 } 2839 #endif 2840 2841 /* 2842 * Perform rate limit check. 2843 * Returns 0 if it is okay to send the icmp6 packet. 2844 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate 2845 * limitation. 2846 * 2847 * XXX per-destination/type check necessary? 2848 */ 2849 static int 2850 icmp6_ratelimit(dst, type, code) 2851 const struct in6_addr *dst; /* not used at this moment */ 2852 const int type; /* not used at this moment */ 2853 const int code; /* not used at this moment */ 2854 { 2855 int ret; 2856 2857 ret = 0; /* okay to send */ 2858 2859 /* PPS limit */ 2860 if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count, 2861 icmp6errppslim)) { 2862 /* The packet is subject to rate limit */ 2863 ret++; 2864 } 2865 2866 return ret; 2867 }
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