1 /* $FreeBSD$ */ 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 #define HAVE_PPSRATECHECK 162 #ifndef HAVE_PPSRATECHECK 163 static int ppsratecheck __P((struct timeval *, int *, int)); 164 #endif 165 static struct mbuf *ni6_input __P((struct mbuf *, int)); 166 static struct mbuf *ni6_nametodns __P((const char *, int, int)); 167 static int ni6_dnsmatch __P((const char *, int, const char *, int)); 168 static int ni6_addrs __P((struct icmp6_nodeinfo *, struct mbuf *, 169 struct ifnet **, char *)); 170 static int ni6_store_addrs __P((struct icmp6_nodeinfo *, struct icmp6_nodeinfo *, 171 struct ifnet *, int)); 172 static int icmp6_notify_error __P((struct mbuf *, int, int, int)); 173 174 #ifdef COMPAT_RFC1885 175 static struct route_in6 icmp6_reflect_rt; 176 #endif 177 178 179 void 180 icmp6_init() 181 { 182 mld6_init(); 183 } 184 185 static void 186 icmp6_errcount(stat, type, code) 187 struct icmp6errstat *stat; 188 int type, code; 189 { 190 switch (type) { 191 case ICMP6_DST_UNREACH: 192 switch (code) { 193 case ICMP6_DST_UNREACH_NOROUTE: 194 stat->icp6errs_dst_unreach_noroute++; 195 return; 196 case ICMP6_DST_UNREACH_ADMIN: 197 stat->icp6errs_dst_unreach_admin++; 198 return; 199 case ICMP6_DST_UNREACH_BEYONDSCOPE: 200 stat->icp6errs_dst_unreach_beyondscope++; 201 return; 202 case ICMP6_DST_UNREACH_ADDR: 203 stat->icp6errs_dst_unreach_addr++; 204 return; 205 case ICMP6_DST_UNREACH_NOPORT: 206 stat->icp6errs_dst_unreach_noport++; 207 return; 208 } 209 break; 210 case ICMP6_PACKET_TOO_BIG: 211 stat->icp6errs_packet_too_big++; 212 return; 213 case ICMP6_TIME_EXCEEDED: 214 switch (code) { 215 case ICMP6_TIME_EXCEED_TRANSIT: 216 stat->icp6errs_time_exceed_transit++; 217 return; 218 case ICMP6_TIME_EXCEED_REASSEMBLY: 219 stat->icp6errs_time_exceed_reassembly++; 220 return; 221 } 222 break; 223 case ICMP6_PARAM_PROB: 224 switch (code) { 225 case ICMP6_PARAMPROB_HEADER: 226 stat->icp6errs_paramprob_header++; 227 return; 228 case ICMP6_PARAMPROB_NEXTHEADER: 229 stat->icp6errs_paramprob_nextheader++; 230 return; 231 case ICMP6_PARAMPROB_OPTION: 232 stat->icp6errs_paramprob_option++; 233 return; 234 } 235 break; 236 case ND_REDIRECT: 237 stat->icp6errs_redirect++; 238 return; 239 } 240 stat->icp6errs_unknown++; 241 } 242 243 /* 244 * Generate an error packet of type error in response to bad IP6 packet. 245 */ 246 void 247 icmp6_error(m, type, code, param) 248 struct mbuf *m; 249 int type, code, param; 250 { 251 struct ip6_hdr *oip6, *nip6; 252 struct icmp6_hdr *icmp6; 253 u_int preplen; 254 int off; 255 int nxt; 256 257 icmp6stat.icp6s_error++; 258 259 /* count per-type-code statistics */ 260 icmp6_errcount(&icmp6stat.icp6s_outerrhist, type, code); 261 262 #ifdef M_DECRYPTED /*not openbsd*/ 263 if (m->m_flags & M_DECRYPTED) { 264 icmp6stat.icp6s_canterror++; 265 goto freeit; 266 } 267 #endif 268 269 #ifndef PULLDOWN_TEST 270 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), ); 271 #else 272 if (m->m_len < sizeof(struct ip6_hdr)) { 273 m = m_pullup(m, sizeof(struct ip6_hdr)); 274 if (m == NULL) 275 return; 276 } 277 #endif 278 oip6 = mtod(m, struct ip6_hdr *); 279 280 /* 281 * Multicast destination check. For unrecognized option errors, 282 * this check has already done in ip6_unknown_opt(), so we can 283 * check only for other errors. 284 */ 285 if ((m->m_flags & (M_BCAST|M_MCAST) || 286 IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) && 287 (type != ICMP6_PACKET_TOO_BIG && 288 (type != ICMP6_PARAM_PROB || 289 code != ICMP6_PARAMPROB_OPTION))) 290 goto freeit; 291 292 /* Source address check. XXX: the case of anycast source? */ 293 if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) || 294 IN6_IS_ADDR_MULTICAST(&oip6->ip6_src)) 295 goto freeit; 296 297 /* 298 * If we are about to send ICMPv6 against ICMPv6 error/redirect, 299 * don't do it. 300 */ 301 nxt = -1; 302 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 303 if (off >= 0 && nxt == IPPROTO_ICMPV6) { 304 struct icmp6_hdr *icp; 305 306 #ifndef PULLDOWN_TEST 307 IP6_EXTHDR_CHECK(m, 0, off + sizeof(struct icmp6_hdr), ); 308 icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 309 #else 310 IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off, 311 sizeof(*icp)); 312 if (icp == NULL) { 313 icmp6stat.icp6s_tooshort++; 314 return; 315 } 316 #endif 317 if (icp->icmp6_type < ICMP6_ECHO_REQUEST || 318 icp->icmp6_type == ND_REDIRECT) { 319 /* 320 * ICMPv6 error 321 * Special case: for redirect (which is 322 * informational) we must not send icmp6 error. 323 */ 324 icmp6stat.icp6s_canterror++; 325 goto freeit; 326 } else { 327 /* ICMPv6 informational - send the error */ 328 } 329 } else { 330 /* non-ICMPv6 - send the error */ 331 } 332 333 oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */ 334 335 /* Finally, do rate limitation check. */ 336 if (icmp6_ratelimit(&oip6->ip6_src, type, code)) { 337 icmp6stat.icp6s_toofreq++; 338 goto freeit; 339 } 340 341 /* 342 * OK, ICMP6 can be generated. 343 */ 344 345 if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN) 346 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len); 347 348 preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 349 M_PREPEND(m, preplen, M_DONTWAIT); 350 if (m && m->m_len < preplen) 351 m = m_pullup(m, preplen); 352 if (m == NULL) { 353 nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__)); 354 return; 355 } 356 357 nip6 = mtod(m, struct ip6_hdr *); 358 nip6->ip6_src = oip6->ip6_src; 359 nip6->ip6_dst = oip6->ip6_dst; 360 361 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_src)) 362 oip6->ip6_src.s6_addr16[1] = 0; 363 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_dst)) 364 oip6->ip6_dst.s6_addr16[1] = 0; 365 366 icmp6 = (struct icmp6_hdr *)(nip6 + 1); 367 icmp6->icmp6_type = type; 368 icmp6->icmp6_code = code; 369 icmp6->icmp6_pptr = htonl((u_int32_t)param); 370 371 /* 372 * icmp6_reflect() is designed to be in the input path. 373 * icmp6_error() can be called from both input and outut path, 374 * and if we are in output path rcvif could contain bogus value. 375 * clear m->m_pkthdr.rcvif for safety, we should have enough scope 376 * information in ip header (nip6). 377 */ 378 m->m_pkthdr.rcvif = NULL; 379 380 icmp6stat.icp6s_outhist[type]++; 381 icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */ 382 383 return; 384 385 freeit: 386 /* 387 * If we can't tell wheter or not we can generate ICMP6, free it. 388 */ 389 m_freem(m); 390 } 391 392 /* 393 * Process a received ICMP6 message. 394 */ 395 int 396 icmp6_input(mp, offp, proto) 397 struct mbuf **mp; 398 int *offp, proto; 399 { 400 struct mbuf *m = *mp, *n; 401 struct ip6_hdr *ip6, *nip6; 402 struct icmp6_hdr *icmp6, *nicmp6; 403 int off = *offp; 404 int icmp6len = m->m_pkthdr.len - *offp; 405 int code, sum, noff; 406 407 #ifndef PULLDOWN_TEST 408 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr), IPPROTO_DONE); 409 /* m might change if M_LOOP. So, call mtod after this */ 410 #endif 411 412 /* 413 * Locate icmp6 structure in mbuf, and check 414 * that not corrupted and of at least minimum length 415 */ 416 417 ip6 = mtod(m, struct ip6_hdr *); 418 if (icmp6len < sizeof(struct icmp6_hdr)) { 419 icmp6stat.icp6s_tooshort++; 420 goto freeit; 421 } 422 423 /* 424 * calculate the checksum 425 */ 426 #ifndef PULLDOWN_TEST 427 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off); 428 #else 429 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 430 if (icmp6 == NULL) { 431 icmp6stat.icp6s_tooshort++; 432 return IPPROTO_DONE; 433 } 434 #endif 435 code = icmp6->icmp6_code; 436 437 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) { 438 nd6log((LOG_ERR, 439 "ICMP6 checksum error(%d|%x) %s\n", 440 icmp6->icmp6_type, sum, ip6_sprintf(&ip6->ip6_src))); 441 icmp6stat.icp6s_checksum++; 442 goto freeit; 443 } 444 445 if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) { 446 /* 447 * Deliver very specific ICMP6 type only. 448 * This is important to deilver TOOBIG. Otherwise PMTUD 449 * will not work. 450 */ 451 switch (icmp6->icmp6_type) { 452 case ICMP6_DST_UNREACH: 453 case ICMP6_PACKET_TOO_BIG: 454 case ICMP6_TIME_EXCEEDED: 455 break; 456 default: 457 goto freeit; 458 } 459 } 460 461 icmp6stat.icp6s_inhist[icmp6->icmp6_type]++; 462 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_msg); 463 if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK) 464 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error); 465 466 switch (icmp6->icmp6_type) { 467 case ICMP6_DST_UNREACH: 468 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_dstunreach); 469 switch (code) { 470 case ICMP6_DST_UNREACH_NOROUTE: 471 code = PRC_UNREACH_NET; 472 break; 473 case ICMP6_DST_UNREACH_ADMIN: 474 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_adminprohib); 475 code = PRC_UNREACH_PROTOCOL; /* is this a good code? */ 476 break; 477 case ICMP6_DST_UNREACH_ADDR: 478 code = PRC_HOSTDEAD; 479 break; 480 #ifdef COMPAT_RFC1885 481 case ICMP6_DST_UNREACH_NOTNEIGHBOR: 482 code = PRC_UNREACH_SRCFAIL; 483 break; 484 #else 485 case ICMP6_DST_UNREACH_BEYONDSCOPE: 486 /* I mean "source address was incorrect." */ 487 code = PRC_PARAMPROB; 488 break; 489 #endif 490 case ICMP6_DST_UNREACH_NOPORT: 491 code = PRC_UNREACH_PORT; 492 break; 493 default: 494 goto badcode; 495 } 496 goto deliver; 497 break; 498 499 case ICMP6_PACKET_TOO_BIG: 500 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_pkttoobig); 501 if (code != 0) 502 goto badcode; 503 504 code = PRC_MSGSIZE; 505 506 /* 507 * Updating the path MTU will be done after examining 508 * intermediate extension headers. 509 */ 510 goto deliver; 511 break; 512 513 case ICMP6_TIME_EXCEEDED: 514 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_timeexceed); 515 switch (code) { 516 case ICMP6_TIME_EXCEED_TRANSIT: 517 case ICMP6_TIME_EXCEED_REASSEMBLY: 518 code += PRC_TIMXCEED_INTRANS; 519 break; 520 default: 521 goto badcode; 522 } 523 goto deliver; 524 break; 525 526 case ICMP6_PARAM_PROB: 527 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_paramprob); 528 switch (code) { 529 case ICMP6_PARAMPROB_NEXTHEADER: 530 code = PRC_UNREACH_PROTOCOL; 531 break; 532 case ICMP6_PARAMPROB_HEADER: 533 case ICMP6_PARAMPROB_OPTION: 534 code = PRC_PARAMPROB; 535 break; 536 default: 537 goto badcode; 538 } 539 goto deliver; 540 break; 541 542 case ICMP6_ECHO_REQUEST: 543 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echo); 544 if (code != 0) 545 goto badcode; 546 if ((n = m_copy(m, 0, M_COPYALL)) == NULL) { 547 /* Give up remote */ 548 break; 549 } 550 if ((n->m_flags & M_EXT) != 0 551 || n->m_len < off + sizeof(struct icmp6_hdr)) { 552 struct mbuf *n0 = n; 553 const int maxlen = sizeof(*nip6) + sizeof(*nicmp6); 554 int n0len; 555 556 /* 557 * Prepare an internal mbuf. m_pullup() doesn't 558 * always copy the length we specified. 559 */ 560 if (maxlen >= MCLBYTES) { 561 /* Give up remote */ 562 m_freem(n0); 563 break; 564 } 565 MGETHDR(n, M_DONTWAIT, n0->m_type); 566 n0len = n0->m_pkthdr.len; /* save for use below */ 567 if (n) 568 M_MOVE_PKTHDR(n, n0); 569 if (n && maxlen >= MHLEN) { 570 MCLGET(n, M_DONTWAIT); 571 if ((n->m_flags & M_EXT) == 0) { 572 m_free(n); 573 n = NULL; 574 } 575 } 576 if (n == NULL) { 577 /* Give up remote */ 578 m_freem(n0); 579 break; 580 } 581 /* 582 * Copy IPv6 and ICMPv6 only. 583 */ 584 nip6 = mtod(n, struct ip6_hdr *); 585 bcopy(ip6, nip6, sizeof(struct ip6_hdr)); 586 nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 587 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); 588 noff = sizeof(struct ip6_hdr); 589 /* new mbuf contains only ipv6+icmpv6 headers */ 590 n->m_len = noff + sizeof(struct icmp6_hdr); 591 /* 592 * Adjust mbuf. ip6_plen will be adjusted in 593 * ip6_output(). 594 */ 595 m_adj(n0, off + sizeof(struct icmp6_hdr)); 596 /* recalculate complete packet size */ 597 n->m_pkthdr.len = n0len + (noff - off); 598 n->m_next = n0; 599 } else { 600 nip6 = mtod(n, struct ip6_hdr *); 601 nicmp6 = (struct icmp6_hdr *)((caddr_t)nip6 + off); 602 noff = off; 603 } 604 nicmp6->icmp6_type = ICMP6_ECHO_REPLY; 605 nicmp6->icmp6_code = 0; 606 if (n) { 607 icmp6stat.icp6s_reflect++; 608 icmp6stat.icp6s_outhist[ICMP6_ECHO_REPLY]++; 609 icmp6_reflect(n, noff); 610 } 611 break; 612 613 case ICMP6_ECHO_REPLY: 614 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echoreply); 615 if (code != 0) 616 goto badcode; 617 break; 618 619 case MLD_LISTENER_QUERY: 620 case MLD_LISTENER_REPORT: 621 if (icmp6len < sizeof(struct mld_hdr)) 622 goto badlen; 623 if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */ 624 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldquery); 625 else 626 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldreport); 627 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 628 /* give up local */ 629 mld6_input(m, off); 630 m = NULL; 631 goto freeit; 632 } 633 mld6_input(n, off); 634 /* m stays. */ 635 break; 636 637 case MLD_LISTENER_DONE: 638 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mlddone); 639 if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */ 640 goto badlen; 641 break; /* nothing to be done in kernel */ 642 643 case MLD_MTRACE_RESP: 644 case MLD_MTRACE: 645 /* XXX: these two are experimental. not officially defind. */ 646 /* XXX: per-interface statistics? */ 647 break; /* just pass it to applications */ 648 649 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */ 650 { 651 enum { WRU, FQDN } mode; 652 653 if (!icmp6_nodeinfo) 654 break; 655 656 if (icmp6len == sizeof(struct icmp6_hdr) + 4) 657 mode = WRU; 658 else if (icmp6len >= sizeof(struct icmp6_nodeinfo)) 659 mode = FQDN; 660 else 661 goto badlen; 662 663 #define hostnamelen strlen(hostname) 664 if (mode == FQDN) { 665 #ifndef PULLDOWN_TEST 666 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo), 667 IPPROTO_DONE); 668 #endif 669 n = m_copy(m, 0, M_COPYALL); 670 if (n) 671 n = ni6_input(n, off); 672 /* XXX meaningless if n == NULL */ 673 noff = sizeof(struct ip6_hdr); 674 } else { 675 u_char *p; 676 int maxlen, maxhlen; 677 678 if ((icmp6_nodeinfo & 5) != 5) 679 break; 680 681 if (code != 0) 682 goto badcode; 683 maxlen = sizeof(*nip6) + sizeof(*nicmp6) + 4; 684 if (maxlen >= MCLBYTES) { 685 /* Give up remote */ 686 break; 687 } 688 MGETHDR(n, M_DONTWAIT, m->m_type); 689 if (n && maxlen > MHLEN) { 690 MCLGET(n, M_DONTWAIT); 691 if ((n->m_flags & M_EXT) == 0) { 692 m_free(n); 693 n = NULL; 694 } 695 } 696 if (!m_dup_pkthdr(n, m, M_DONTWAIT)) { 697 /* 698 * Previous code did a blind M_COPY_PKTHDR 699 * and said "just for rcvif". If true, then 700 * we could tolerate the dup failing (due to 701 * the deep copy of the tag chain). For now 702 * be conservative and just fail. 703 */ 704 m_free(n); 705 n = NULL; 706 } 707 if (n == NULL) { 708 /* Give up remote */ 709 break; 710 } 711 n->m_pkthdr.rcvif = NULL; 712 n->m_len = 0; 713 maxhlen = M_TRAILINGSPACE(n) - maxlen; 714 if (maxhlen > hostnamelen) 715 maxhlen = hostnamelen; 716 /* 717 * Copy IPv6 and ICMPv6 only. 718 */ 719 nip6 = mtod(n, struct ip6_hdr *); 720 bcopy(ip6, nip6, sizeof(struct ip6_hdr)); 721 nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 722 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); 723 p = (u_char *)(nicmp6 + 1); 724 bzero(p, 4); 725 bcopy(hostname, p + 4, maxhlen); /* meaningless TTL */ 726 noff = sizeof(struct ip6_hdr); 727 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 728 sizeof(struct icmp6_hdr) + 4 + maxhlen; 729 nicmp6->icmp6_type = ICMP6_WRUREPLY; 730 nicmp6->icmp6_code = 0; 731 } 732 #undef hostnamelen 733 if (n) { 734 icmp6stat.icp6s_reflect++; 735 icmp6stat.icp6s_outhist[ICMP6_WRUREPLY]++; 736 icmp6_reflect(n, noff); 737 } 738 break; 739 } 740 741 case ICMP6_WRUREPLY: 742 if (code != 0) 743 goto badcode; 744 break; 745 746 case ND_ROUTER_SOLICIT: 747 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routersolicit); 748 if (code != 0) 749 goto badcode; 750 if (icmp6len < sizeof(struct nd_router_solicit)) 751 goto badlen; 752 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 753 /* give up local */ 754 nd6_rs_input(m, off, icmp6len); 755 m = NULL; 756 goto freeit; 757 } 758 nd6_rs_input(n, off, icmp6len); 759 /* m stays. */ 760 break; 761 762 case ND_ROUTER_ADVERT: 763 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routeradvert); 764 if (code != 0) 765 goto badcode; 766 if (icmp6len < sizeof(struct nd_router_advert)) 767 goto badlen; 768 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 769 /* give up local */ 770 nd6_ra_input(m, off, icmp6len); 771 m = NULL; 772 goto freeit; 773 } 774 nd6_ra_input(n, off, icmp6len); 775 /* m stays. */ 776 break; 777 778 case ND_NEIGHBOR_SOLICIT: 779 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighborsolicit); 780 if (code != 0) 781 goto badcode; 782 if (icmp6len < sizeof(struct nd_neighbor_solicit)) 783 goto badlen; 784 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 785 /* give up local */ 786 nd6_ns_input(m, off, icmp6len); 787 m = NULL; 788 goto freeit; 789 } 790 nd6_ns_input(n, off, icmp6len); 791 /* m stays. */ 792 break; 793 794 case ND_NEIGHBOR_ADVERT: 795 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighboradvert); 796 if (code != 0) 797 goto badcode; 798 if (icmp6len < sizeof(struct nd_neighbor_advert)) 799 goto badlen; 800 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 801 /* give up local */ 802 nd6_na_input(m, off, icmp6len); 803 m = NULL; 804 goto freeit; 805 } 806 nd6_na_input(n, off, icmp6len); 807 /* m stays. */ 808 break; 809 810 case ND_REDIRECT: 811 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_redirect); 812 if (code != 0) 813 goto badcode; 814 if (icmp6len < sizeof(struct nd_redirect)) 815 goto badlen; 816 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 817 /* give up local */ 818 icmp6_redirect_input(m, off); 819 m = NULL; 820 goto freeit; 821 } 822 icmp6_redirect_input(n, off); 823 /* m stays. */ 824 break; 825 826 case ICMP6_ROUTER_RENUMBERING: 827 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND && 828 code != ICMP6_ROUTER_RENUMBERING_RESULT) 829 goto badcode; 830 if (icmp6len < sizeof(struct icmp6_router_renum)) 831 goto badlen; 832 break; 833 834 default: 835 nd6log((LOG_DEBUG, 836 "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n", 837 icmp6->icmp6_type, ip6_sprintf(&ip6->ip6_src), 838 ip6_sprintf(&ip6->ip6_dst), 839 m->m_pkthdr.rcvif ? m->m_pkthdr.rcvif->if_index : 0)); 840 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) { 841 /* ICMPv6 error: MUST deliver it by spec... */ 842 code = PRC_NCMDS; 843 /* deliver */ 844 } else { 845 /* ICMPv6 informational: MUST not deliver */ 846 break; 847 } 848 deliver: 849 if (icmp6_notify_error(m, off, icmp6len, code)) { 850 /* In this case, m should've been freed. */ 851 return(IPPROTO_DONE); 852 } 853 break; 854 855 badcode: 856 icmp6stat.icp6s_badcode++; 857 break; 858 859 badlen: 860 icmp6stat.icp6s_badlen++; 861 break; 862 } 863 864 /* deliver the packet to appropriate sockets */ 865 icmp6_rip6_input(&m, *offp); 866 867 return IPPROTO_DONE; 868 869 freeit: 870 m_freem(m); 871 return IPPROTO_DONE; 872 } 873 874 static int 875 icmp6_notify_error(m, off, icmp6len, code) 876 struct mbuf *m; 877 int off, icmp6len, code; 878 { 879 struct icmp6_hdr *icmp6; 880 struct ip6_hdr *eip6; 881 u_int32_t notifymtu; 882 struct sockaddr_in6 icmp6src, icmp6dst; 883 884 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) { 885 icmp6stat.icp6s_tooshort++; 886 goto freeit; 887 } 888 #ifndef PULLDOWN_TEST 889 IP6_EXTHDR_CHECK(m, off, 890 sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr), 891 -1); 892 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 893 #else 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 #endif 901 eip6 = (struct ip6_hdr *)(icmp6 + 1); 902 903 /* Detect the upper level protocol */ 904 { 905 void (*ctlfunc) __P((int, struct sockaddr *, void *)); 906 u_int8_t nxt = eip6->ip6_nxt; 907 int eoff = off + sizeof(struct icmp6_hdr) + 908 sizeof(struct ip6_hdr); 909 struct ip6ctlparam ip6cp; 910 struct in6_addr *finaldst = NULL; 911 int icmp6type = icmp6->icmp6_type; 912 struct ip6_frag *fh; 913 struct ip6_rthdr *rth; 914 struct ip6_rthdr0 *rth0; 915 int rthlen; 916 917 while (1) { /* XXX: should avoid infinite loop explicitly? */ 918 struct ip6_ext *eh; 919 920 switch (nxt) { 921 case IPPROTO_HOPOPTS: 922 case IPPROTO_DSTOPTS: 923 case IPPROTO_AH: 924 #ifndef PULLDOWN_TEST 925 IP6_EXTHDR_CHECK(m, 0, eoff + 926 sizeof(struct ip6_ext), 927 -1); 928 eh = (struct ip6_ext *)(mtod(m, caddr_t) 929 + eoff); 930 #else 931 IP6_EXTHDR_GET(eh, struct ip6_ext *, m, 932 eoff, sizeof(*eh)); 933 if (eh == NULL) { 934 icmp6stat.icp6s_tooshort++; 935 return(-1); 936 } 937 #endif 938 939 if (nxt == IPPROTO_AH) 940 eoff += (eh->ip6e_len + 2) << 2; 941 else 942 eoff += (eh->ip6e_len + 1) << 3; 943 nxt = eh->ip6e_nxt; 944 break; 945 case IPPROTO_ROUTING: 946 /* 947 * When the erroneous packet contains a 948 * routing header, we should examine the 949 * header to determine the final destination. 950 * Otherwise, we can't properly update 951 * information that depends on the final 952 * destination (e.g. path MTU). 953 */ 954 #ifndef PULLDOWN_TEST 955 IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(*rth), 956 -1); 957 rth = (struct ip6_rthdr *)(mtod(m, caddr_t) 958 + eoff); 959 #else 960 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m, 961 eoff, sizeof(*rth)); 962 if (rth == NULL) { 963 icmp6stat.icp6s_tooshort++; 964 return(-1); 965 } 966 #endif 967 rthlen = (rth->ip6r_len + 1) << 3; 968 /* 969 * XXX: currently there is no 970 * officially defined type other 971 * than type-0. 972 * Note that if the segment left field 973 * is 0, all intermediate hops must 974 * have been passed. 975 */ 976 if (rth->ip6r_segleft && 977 rth->ip6r_type == IPV6_RTHDR_TYPE_0) { 978 int hops; 979 980 #ifndef PULLDOWN_TEST 981 IP6_EXTHDR_CHECK(m, 0, eoff + rthlen, 982 -1); 983 rth0 = (struct ip6_rthdr0 *)(mtod(m, caddr_t) + eoff); 984 #else 985 IP6_EXTHDR_GET(rth0, 986 struct ip6_rthdr0 *, m, 987 eoff, rthlen); 988 if (rth0 == NULL) { 989 icmp6stat.icp6s_tooshort++; 990 return(-1); 991 } 992 #endif 993 /* just ignore a bogus header */ 994 if ((rth0->ip6r0_len % 2) == 0 && 995 (hops = rth0->ip6r0_len/2)) 996 finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1); 997 } 998 eoff += rthlen; 999 nxt = rth->ip6r_nxt; 1000 break; 1001 case IPPROTO_FRAGMENT: 1002 #ifndef PULLDOWN_TEST 1003 IP6_EXTHDR_CHECK(m, 0, eoff + 1004 sizeof(struct ip6_frag), 1005 -1); 1006 fh = (struct ip6_frag *)(mtod(m, caddr_t) 1007 + eoff); 1008 #else 1009 IP6_EXTHDR_GET(fh, struct ip6_frag *, m, 1010 eoff, sizeof(*fh)); 1011 if (fh == NULL) { 1012 icmp6stat.icp6s_tooshort++; 1013 return(-1); 1014 } 1015 #endif 1016 /* 1017 * Data after a fragment header is meaningless 1018 * unless it is the first fragment, but 1019 * we'll go to the notify label for path MTU 1020 * discovery. 1021 */ 1022 if (fh->ip6f_offlg & IP6F_OFF_MASK) 1023 goto notify; 1024 1025 eoff += sizeof(struct ip6_frag); 1026 nxt = fh->ip6f_nxt; 1027 break; 1028 default: 1029 /* 1030 * This case includes ESP and the No Next 1031 * Header. In such cases going to the notify 1032 * label does not have any meaning 1033 * (i.e. ctlfunc will be NULL), but we go 1034 * anyway since we might have to update 1035 * path MTU information. 1036 */ 1037 goto notify; 1038 } 1039 } 1040 notify: 1041 #ifndef PULLDOWN_TEST 1042 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 1043 #else 1044 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 1045 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 1046 if (icmp6 == NULL) { 1047 icmp6stat.icp6s_tooshort++; 1048 return(-1); 1049 } 1050 #endif 1051 1052 eip6 = (struct ip6_hdr *)(icmp6 + 1); 1053 bzero(&icmp6dst, sizeof(icmp6dst)); 1054 icmp6dst.sin6_len = sizeof(struct sockaddr_in6); 1055 icmp6dst.sin6_family = AF_INET6; 1056 if (finaldst == NULL) 1057 icmp6dst.sin6_addr = eip6->ip6_dst; 1058 else 1059 icmp6dst.sin6_addr = *finaldst; 1060 icmp6dst.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif, 1061 &icmp6dst.sin6_addr); 1062 #ifndef SCOPEDROUTING 1063 if (in6_embedscope(&icmp6dst.sin6_addr, &icmp6dst, 1064 NULL, NULL)) { 1065 /* should be impossbile */ 1066 nd6log((LOG_DEBUG, 1067 "icmp6_notify_error: in6_embedscope failed\n")); 1068 goto freeit; 1069 } 1070 #endif 1071 1072 /* 1073 * retrieve parameters from the inner IPv6 header, and convert 1074 * them into sockaddr structures. 1075 */ 1076 bzero(&icmp6src, sizeof(icmp6src)); 1077 icmp6src.sin6_len = sizeof(struct sockaddr_in6); 1078 icmp6src.sin6_family = AF_INET6; 1079 icmp6src.sin6_addr = eip6->ip6_src; 1080 icmp6src.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif, 1081 &icmp6src.sin6_addr); 1082 #ifndef SCOPEDROUTING 1083 if (in6_embedscope(&icmp6src.sin6_addr, &icmp6src, 1084 NULL, NULL)) { 1085 /* should be impossbile */ 1086 nd6log((LOG_DEBUG, 1087 "icmp6_notify_error: in6_embedscope failed\n")); 1088 goto freeit; 1089 } 1090 #endif 1091 icmp6src.sin6_flowinfo = 1092 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK); 1093 1094 if (finaldst == NULL) 1095 finaldst = &eip6->ip6_dst; 1096 ip6cp.ip6c_m = m; 1097 ip6cp.ip6c_icmp6 = icmp6; 1098 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1); 1099 ip6cp.ip6c_off = eoff; 1100 ip6cp.ip6c_finaldst = finaldst; 1101 ip6cp.ip6c_src = &icmp6src; 1102 ip6cp.ip6c_nxt = nxt; 1103 1104 if (icmp6type == ICMP6_PACKET_TOO_BIG) { 1105 notifymtu = ntohl(icmp6->icmp6_mtu); 1106 ip6cp.ip6c_cmdarg = (void *)¬ifymtu; 1107 icmp6_mtudisc_update(&ip6cp, 1); /*XXX*/ 1108 } 1109 1110 ctlfunc = (void (*) __P((int, struct sockaddr *, void *))) 1111 (inet6sw[ip6_protox[nxt]].pr_ctlinput); 1112 if (ctlfunc) { 1113 (void) (*ctlfunc)(code, (struct sockaddr *)&icmp6dst, 1114 &ip6cp); 1115 } 1116 } 1117 return(0); 1118 1119 freeit: 1120 m_freem(m); 1121 return(-1); 1122 } 1123 1124 void 1125 icmp6_mtudisc_update(ip6cp, validated) 1126 struct ip6ctlparam *ip6cp; 1127 int validated; 1128 { 1129 struct in6_addr *dst = ip6cp->ip6c_finaldst; 1130 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6; 1131 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */ 1132 u_int mtu = ntohl(icmp6->icmp6_mtu); 1133 struct rtentry *rt = NULL; 1134 struct sockaddr_in6 sin6; 1135 1136 if (!validated) 1137 return; 1138 1139 bzero(&sin6, sizeof(sin6)); 1140 sin6.sin6_family = PF_INET6; 1141 sin6.sin6_len = sizeof(struct sockaddr_in6); 1142 sin6.sin6_addr = *dst; 1143 /* XXX normally, this won't happen */ 1144 if (IN6_IS_ADDR_LINKLOCAL(dst)) { 1145 sin6.sin6_addr.s6_addr16[1] = 1146 htons(m->m_pkthdr.rcvif->if_index); 1147 } 1148 /* sin6.sin6_scope_id = XXX: should be set if DST is a scoped addr */ 1149 rt = rtalloc1((struct sockaddr *)&sin6, 0, 1150 RTF_CLONING | RTF_PRCLONING); 1151 1152 if (rt && (rt->rt_flags & RTF_HOST) 1153 && !(rt->rt_rmx.rmx_locks & RTV_MTU)) { 1154 if (mtu < IPV6_MMTU) { 1155 /* xxx */ 1156 rt->rt_rmx.rmx_locks |= RTV_MTU; 1157 } else if (mtu < rt->rt_ifp->if_mtu && 1158 rt->rt_rmx.rmx_mtu > mtu) { 1159 icmp6stat.icp6s_pmtuchg++; 1160 rt->rt_rmx.rmx_mtu = mtu; 1161 } 1162 } 1163 if (rt) { /* XXX: need braces to avoid conflict with else in RTFREE. */ 1164 RTFREE(rt); 1165 } 1166 } 1167 1168 /* 1169 * Process a Node Information Query packet, based on 1170 * draft-ietf-ipngwg-icmp-name-lookups-07. 1171 * 1172 * Spec incompatibilities: 1173 * - IPv6 Subject address handling 1174 * - IPv4 Subject address handling support missing 1175 * - Proxy reply (answer even if it's not for me) 1176 * - joins NI group address at in6_ifattach() time only, does not cope 1177 * with hostname changes by sethostname(3) 1178 */ 1179 #define hostnamelen strlen(hostname) 1180 static struct mbuf * 1181 ni6_input(m, off) 1182 struct mbuf *m; 1183 int off; 1184 { 1185 struct icmp6_nodeinfo *ni6, *nni6; 1186 struct mbuf *n = NULL; 1187 u_int16_t qtype; 1188 int subjlen; 1189 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1190 struct ni_reply_fqdn *fqdn; 1191 int addrs; /* for NI_QTYPE_NODEADDR */ 1192 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */ 1193 struct sockaddr_in6 sin6; /* double meaning; ip6_dst and subjectaddr */ 1194 struct sockaddr_in6 sin6_d; /* XXX: we should retrieve this from m_aux */ 1195 struct ip6_hdr *ip6; 1196 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */ 1197 char *subj = NULL; 1198 struct in6_ifaddr *ia6 = NULL; 1199 1200 ip6 = mtod(m, struct ip6_hdr *); 1201 #ifndef PULLDOWN_TEST 1202 ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off); 1203 #else 1204 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6)); 1205 if (ni6 == NULL) { 1206 /* m is already reclaimed */ 1207 return NULL; 1208 } 1209 #endif 1210 1211 /* 1212 * Validate IPv6 destination address. 1213 * 1214 * The Responder must discard the Query without further processing 1215 * unless it is one of the Responder's unicast or anycast addresses, or 1216 * a link-local scope multicast address which the Responder has joined. 1217 * [icmp-name-lookups-07, Section 4.] 1218 */ 1219 bzero(&sin6, sizeof(sin6)); 1220 sin6.sin6_family = AF_INET6; 1221 sin6.sin6_len = sizeof(struct sockaddr_in6); 1222 bcopy(&ip6->ip6_dst, &sin6.sin6_addr, sizeof(sin6.sin6_addr)); 1223 /* XXX scopeid */ 1224 if ((ia6 = (struct in6_ifaddr *)ifa_ifwithaddr((struct sockaddr *)&sin6)) != NULL) { 1225 /* unicast/anycast, fine */ 1226 if ((ia6->ia6_flags & IN6_IFF_TEMPORARY) != 0 && 1227 (icmp6_nodeinfo & 4) == 0) { 1228 nd6log((LOG_DEBUG, "ni6_input: ignore node info to " 1229 "a temporary address in %s:%d", 1230 __FILE__, __LINE__)); 1231 goto bad; 1232 } 1233 } else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr)) 1234 ; /* link-local multicast, fine */ 1235 else 1236 goto bad; 1237 1238 /* validate query Subject field. */ 1239 qtype = ntohs(ni6->ni_qtype); 1240 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo); 1241 switch (qtype) { 1242 case NI_QTYPE_NOOP: 1243 case NI_QTYPE_SUPTYPES: 1244 /* 07 draft */ 1245 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0) 1246 break; 1247 /* FALLTHROUGH */ 1248 case NI_QTYPE_FQDN: 1249 case NI_QTYPE_NODEADDR: 1250 switch (ni6->ni_code) { 1251 case ICMP6_NI_SUBJ_IPV6: 1252 #if ICMP6_NI_SUBJ_IPV6 != 0 1253 case 0: 1254 #endif 1255 /* 1256 * backward compatibility - try to accept 03 draft 1257 * format, where no Subject is present. 1258 */ 1259 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 && 1260 subjlen == 0) { 1261 oldfqdn++; 1262 break; 1263 } 1264 #if ICMP6_NI_SUBJ_IPV6 != 0 1265 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6) 1266 goto bad; 1267 #endif 1268 1269 if (subjlen != sizeof(sin6.sin6_addr)) 1270 goto bad; 1271 1272 /* 1273 * Validate Subject address. 1274 * 1275 * Not sure what exactly "address belongs to the node" 1276 * means in the spec, is it just unicast, or what? 1277 * 1278 * At this moment we consider Subject address as 1279 * "belong to the node" if the Subject address equals 1280 * to the IPv6 destination address; validation for 1281 * IPv6 destination address should have done enough 1282 * check for us. 1283 * 1284 * We do not do proxy at this moment. 1285 */ 1286 /* m_pulldown instead of copy? */ 1287 m_copydata(m, off + sizeof(struct icmp6_nodeinfo), 1288 subjlen, (caddr_t)&sin6.sin6_addr); 1289 sin6.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif, 1290 &sin6.sin6_addr); 1291 #ifndef SCOPEDROUTING 1292 in6_embedscope(&sin6.sin6_addr, &sin6, NULL, NULL); 1293 #endif 1294 bzero(&sin6_d, sizeof(sin6_d)); 1295 sin6_d.sin6_family = AF_INET6; /* not used, actually */ 1296 sin6_d.sin6_len = sizeof(sin6_d); /* ditto */ 1297 sin6_d.sin6_addr = ip6->ip6_dst; 1298 sin6_d.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif, 1299 &ip6->ip6_dst); 1300 #ifndef SCOPEDROUTING 1301 in6_embedscope(&sin6_d.sin6_addr, &sin6_d, NULL, NULL); 1302 #endif 1303 subj = (char *)&sin6; 1304 if (SA6_ARE_ADDR_EQUAL(&sin6, &sin6_d)) 1305 break; 1306 1307 /* 1308 * XXX if we are to allow other cases, we should really 1309 * be careful about scope here. 1310 * basically, we should disallow queries toward IPv6 1311 * destination X with subject Y, if scope(X) > scope(Y). 1312 * if we allow scope(X) > scope(Y), it will result in 1313 * information leakage across scope boundary. 1314 */ 1315 goto bad; 1316 1317 case ICMP6_NI_SUBJ_FQDN: 1318 /* 1319 * Validate Subject name with gethostname(3). 1320 * 1321 * The behavior may need some debate, since: 1322 * - we are not sure if the node has FQDN as 1323 * hostname (returned by gethostname(3)). 1324 * - the code does wildcard match for truncated names. 1325 * however, we are not sure if we want to perform 1326 * wildcard match, if gethostname(3) side has 1327 * truncated hostname. 1328 */ 1329 n = ni6_nametodns(hostname, hostnamelen, 0); 1330 if (!n || n->m_next || n->m_len == 0) 1331 goto bad; 1332 IP6_EXTHDR_GET(subj, char *, m, 1333 off + sizeof(struct icmp6_nodeinfo), subjlen); 1334 if (subj == NULL) 1335 goto bad; 1336 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *), 1337 n->m_len)) { 1338 goto bad; 1339 } 1340 m_freem(n); 1341 n = NULL; 1342 break; 1343 1344 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */ 1345 default: 1346 goto bad; 1347 } 1348 break; 1349 } 1350 1351 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */ 1352 switch (qtype) { 1353 case NI_QTYPE_FQDN: 1354 if ((icmp6_nodeinfo & 1) == 0) 1355 goto bad; 1356 break; 1357 case NI_QTYPE_NODEADDR: 1358 if ((icmp6_nodeinfo & 2) == 0) 1359 goto bad; 1360 break; 1361 } 1362 1363 /* guess reply length */ 1364 switch (qtype) { 1365 case NI_QTYPE_NOOP: 1366 break; /* no reply data */ 1367 case NI_QTYPE_SUPTYPES: 1368 replylen += sizeof(u_int32_t); 1369 break; 1370 case NI_QTYPE_FQDN: 1371 /* XXX will append an mbuf */ 1372 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1373 break; 1374 case NI_QTYPE_NODEADDR: 1375 addrs = ni6_addrs(ni6, m, &ifp, subj); 1376 if ((replylen += addrs * (sizeof(struct in6_addr) + 1377 sizeof(u_int32_t))) > MCLBYTES) 1378 replylen = MCLBYTES; /* XXX: will truncate pkt later */ 1379 break; 1380 default: 1381 /* 1382 * XXX: We must return a reply with the ICMP6 code 1383 * `unknown Qtype' in this case. However we regard the case 1384 * as an FQDN query for backward compatibility. 1385 * Older versions set a random value to this field, 1386 * so it rarely varies in the defined qtypes. 1387 * But the mechanism is not reliable... 1388 * maybe we should obsolete older versions. 1389 */ 1390 qtype = NI_QTYPE_FQDN; 1391 /* XXX will append an mbuf */ 1392 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1393 oldfqdn++; 1394 break; 1395 } 1396 1397 /* allocate an mbuf to reply. */ 1398 MGETHDR(n, M_DONTWAIT, m->m_type); 1399 if (n == NULL) { 1400 m_freem(m); 1401 return(NULL); 1402 } 1403 M_MOVE_PKTHDR(n, m); /* just for recvif */ 1404 if (replylen > MHLEN) { 1405 if (replylen > MCLBYTES) { 1406 /* 1407 * XXX: should we try to allocate more? But MCLBYTES 1408 * is probably much larger than IPV6_MMTU... 1409 */ 1410 goto bad; 1411 } 1412 MCLGET(n, M_DONTWAIT); 1413 if ((n->m_flags & M_EXT) == 0) { 1414 goto bad; 1415 } 1416 } 1417 n->m_pkthdr.len = n->m_len = replylen; 1418 1419 /* copy mbuf header and IPv6 + Node Information base headers */ 1420 bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr)); 1421 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1); 1422 bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo)); 1423 1424 /* qtype dependent procedure */ 1425 switch (qtype) { 1426 case NI_QTYPE_NOOP: 1427 nni6->ni_code = ICMP6_NI_SUCCESS; 1428 nni6->ni_flags = 0; 1429 break; 1430 case NI_QTYPE_SUPTYPES: 1431 { 1432 u_int32_t v; 1433 nni6->ni_code = ICMP6_NI_SUCCESS; 1434 nni6->ni_flags = htons(0x0000); /* raw bitmap */ 1435 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */ 1436 v = (u_int32_t)htonl(0x0000000f); 1437 bcopy(&v, nni6 + 1, sizeof(u_int32_t)); 1438 break; 1439 } 1440 case NI_QTYPE_FQDN: 1441 nni6->ni_code = ICMP6_NI_SUCCESS; 1442 fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) + 1443 sizeof(struct ip6_hdr) + 1444 sizeof(struct icmp6_nodeinfo)); 1445 nni6->ni_flags = 0; /* XXX: meaningless TTL */ 1446 fqdn->ni_fqdn_ttl = 0; /* ditto. */ 1447 /* 1448 * XXX do we really have FQDN in variable "hostname"? 1449 */ 1450 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn); 1451 if (n->m_next == NULL) 1452 goto bad; 1453 /* XXX we assume that n->m_next is not a chain */ 1454 if (n->m_next->m_next != NULL) 1455 goto bad; 1456 n->m_pkthdr.len += n->m_next->m_len; 1457 break; 1458 case NI_QTYPE_NODEADDR: 1459 { 1460 int lenlim, copied; 1461 1462 nni6->ni_code = ICMP6_NI_SUCCESS; 1463 n->m_pkthdr.len = n->m_len = 1464 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1465 lenlim = M_TRAILINGSPACE(n); 1466 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim); 1467 /* XXX: reset mbuf length */ 1468 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 1469 sizeof(struct icmp6_nodeinfo) + copied; 1470 break; 1471 } 1472 default: 1473 break; /* XXX impossible! */ 1474 } 1475 1476 nni6->ni_type = ICMP6_NI_REPLY; 1477 m_freem(m); 1478 return(n); 1479 1480 bad: 1481 m_freem(m); 1482 if (n) 1483 m_freem(n); 1484 return(NULL); 1485 } 1486 #undef hostnamelen 1487 1488 /* 1489 * make a mbuf with DNS-encoded string. no compression support. 1490 * 1491 * XXX names with less than 2 dots (like "foo" or "foo.section") will be 1492 * treated as truncated name (two \0 at the end). this is a wild guess. 1493 */ 1494 static struct mbuf * 1495 ni6_nametodns(name, namelen, old) 1496 const char *name; 1497 int namelen; 1498 int old; /* return pascal string if non-zero */ 1499 { 1500 struct mbuf *m; 1501 char *cp, *ep; 1502 const char *p, *q; 1503 int i, len, nterm; 1504 1505 if (old) 1506 len = namelen + 1; 1507 else 1508 len = MCLBYTES; 1509 1510 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */ 1511 MGET(m, M_DONTWAIT, MT_DATA); 1512 if (m && len > MLEN) { 1513 MCLGET(m, M_DONTWAIT); 1514 if ((m->m_flags & M_EXT) == 0) 1515 goto fail; 1516 } 1517 if (!m) 1518 goto fail; 1519 m->m_next = NULL; 1520 1521 if (old) { 1522 m->m_len = len; 1523 *mtod(m, char *) = namelen; 1524 bcopy(name, mtod(m, char *) + 1, namelen); 1525 return m; 1526 } else { 1527 m->m_len = 0; 1528 cp = mtod(m, char *); 1529 ep = mtod(m, char *) + M_TRAILINGSPACE(m); 1530 1531 /* if not certain about my name, return empty buffer */ 1532 if (namelen == 0) 1533 return m; 1534 1535 /* 1536 * guess if it looks like shortened hostname, or FQDN. 1537 * shortened hostname needs two trailing "\0". 1538 */ 1539 i = 0; 1540 for (p = name; p < name + namelen; p++) { 1541 if (*p && *p == '.') 1542 i++; 1543 } 1544 if (i < 2) 1545 nterm = 2; 1546 else 1547 nterm = 1; 1548 1549 p = name; 1550 while (cp < ep && p < name + namelen) { 1551 i = 0; 1552 for (q = p; q < name + namelen && *q && *q != '.'; q++) 1553 i++; 1554 /* result does not fit into mbuf */ 1555 if (cp + i + 1 >= ep) 1556 goto fail; 1557 /* 1558 * DNS label length restriction, RFC1035 page 8. 1559 * "i == 0" case is included here to avoid returning 1560 * 0-length label on "foo..bar". 1561 */ 1562 if (i <= 0 || i >= 64) 1563 goto fail; 1564 *cp++ = i; 1565 bcopy(p, cp, i); 1566 cp += i; 1567 p = q; 1568 if (p < name + namelen && *p == '.') 1569 p++; 1570 } 1571 /* termination */ 1572 if (cp + nterm >= ep) 1573 goto fail; 1574 while (nterm-- > 0) 1575 *cp++ = '\0'; 1576 m->m_len = cp - mtod(m, char *); 1577 return m; 1578 } 1579 1580 panic("should not reach here"); 1581 /* NOTREACHED */ 1582 1583 fail: 1584 if (m) 1585 m_freem(m); 1586 return NULL; 1587 } 1588 1589 /* 1590 * check if two DNS-encoded string matches. takes care of truncated 1591 * form (with \0\0 at the end). no compression support. 1592 * XXX upper/lowercase match (see RFC2065) 1593 */ 1594 static int 1595 ni6_dnsmatch(a, alen, b, blen) 1596 const char *a; 1597 int alen; 1598 const char *b; 1599 int blen; 1600 { 1601 const char *a0, *b0; 1602 int l; 1603 1604 /* simplest case - need validation? */ 1605 if (alen == blen && bcmp(a, b, alen) == 0) 1606 return 1; 1607 1608 a0 = a; 1609 b0 = b; 1610 1611 /* termination is mandatory */ 1612 if (alen < 2 || blen < 2) 1613 return 0; 1614 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0') 1615 return 0; 1616 alen--; 1617 blen--; 1618 1619 while (a - a0 < alen && b - b0 < blen) { 1620 if (a - a0 + 1 > alen || b - b0 + 1 > blen) 1621 return 0; 1622 1623 if ((signed char)a[0] < 0 || (signed char)b[0] < 0) 1624 return 0; 1625 /* we don't support compression yet */ 1626 if (a[0] >= 64 || b[0] >= 64) 1627 return 0; 1628 1629 /* truncated case */ 1630 if (a[0] == 0 && a - a0 == alen - 1) 1631 return 1; 1632 if (b[0] == 0 && b - b0 == blen - 1) 1633 return 1; 1634 if (a[0] == 0 || b[0] == 0) 1635 return 0; 1636 1637 if (a[0] != b[0]) 1638 return 0; 1639 l = a[0]; 1640 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen) 1641 return 0; 1642 if (bcmp(a + 1, b + 1, l) != 0) 1643 return 0; 1644 1645 a += 1 + l; 1646 b += 1 + l; 1647 } 1648 1649 if (a - a0 == alen && b - b0 == blen) 1650 return 1; 1651 else 1652 return 0; 1653 } 1654 1655 /* 1656 * calculate the number of addresses to be returned in the node info reply. 1657 */ 1658 static int 1659 ni6_addrs(ni6, m, ifpp, subj) 1660 struct icmp6_nodeinfo *ni6; 1661 struct mbuf *m; 1662 struct ifnet **ifpp; 1663 char *subj; 1664 { 1665 struct ifnet *ifp; 1666 struct in6_ifaddr *ifa6; 1667 struct ifaddr *ifa; 1668 struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */ 1669 int addrs = 0, addrsofif, iffound = 0; 1670 int niflags = ni6->ni_flags; 1671 1672 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) { 1673 switch (ni6->ni_code) { 1674 case ICMP6_NI_SUBJ_IPV6: 1675 if (subj == NULL) /* must be impossible... */ 1676 return(0); 1677 subj_ip6 = (struct sockaddr_in6 *)subj; 1678 break; 1679 default: 1680 /* 1681 * XXX: we only support IPv6 subject address for 1682 * this Qtype. 1683 */ 1684 return(0); 1685 } 1686 } 1687 1688 IFNET_RLOCK(); 1689 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) 1690 { 1691 addrsofif = 0; 1692 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) 1693 { 1694 if (ifa->ifa_addr->sa_family != AF_INET6) 1695 continue; 1696 ifa6 = (struct in6_ifaddr *)ifa; 1697 1698 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 && 1699 IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr, 1700 &ifa6->ia_addr.sin6_addr)) 1701 iffound = 1; 1702 1703 /* 1704 * IPv4-mapped addresses can only be returned by a 1705 * Node Information proxy, since they represent 1706 * addresses of IPv4-only nodes, which perforce do 1707 * not implement this protocol. 1708 * [icmp-name-lookups-07, Section 5.4] 1709 * So we don't support NI_NODEADDR_FLAG_COMPAT in 1710 * this function at this moment. 1711 */ 1712 1713 /* What do we have to do about ::1? */ 1714 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) { 1715 case IPV6_ADDR_SCOPE_LINKLOCAL: 1716 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1717 continue; 1718 break; 1719 case IPV6_ADDR_SCOPE_SITELOCAL: 1720 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1721 continue; 1722 break; 1723 case IPV6_ADDR_SCOPE_GLOBAL: 1724 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1725 continue; 1726 break; 1727 default: 1728 continue; 1729 } 1730 1731 /* 1732 * check if anycast is okay. 1733 * XXX: just experimental. not in the spec. 1734 */ 1735 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1736 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 1737 continue; /* we need only unicast addresses */ 1738 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 && 1739 (icmp6_nodeinfo & 4) == 0) { 1740 continue; 1741 } 1742 addrsofif++; /* count the address */ 1743 } 1744 if (iffound) { 1745 *ifpp = ifp; 1746 IFNET_RUNLOCK(); 1747 return(addrsofif); 1748 } 1749 1750 addrs += addrsofif; 1751 } 1752 IFNET_RUNLOCK(); 1753 1754 return(addrs); 1755 } 1756 1757 static int 1758 ni6_store_addrs(ni6, nni6, ifp0, resid) 1759 struct icmp6_nodeinfo *ni6, *nni6; 1760 struct ifnet *ifp0; 1761 int resid; 1762 { 1763 struct ifnet *ifp = ifp0 ? ifp0 : TAILQ_FIRST(&ifnet); 1764 struct in6_ifaddr *ifa6; 1765 struct ifaddr *ifa; 1766 struct ifnet *ifp_dep = NULL; 1767 int copied = 0, allow_deprecated = 0; 1768 u_char *cp = (u_char *)(nni6 + 1); 1769 int niflags = ni6->ni_flags; 1770 u_int32_t ltime; 1771 1772 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL)) 1773 return(0); /* needless to copy */ 1774 1775 IFNET_RLOCK(); 1776 again: 1777 for (; ifp; ifp = TAILQ_NEXT(ifp, if_list)) 1778 { 1779 for (ifa = ifp->if_addrlist.tqh_first; ifa; 1780 ifa = ifa->ifa_list.tqe_next) 1781 { 1782 if (ifa->ifa_addr->sa_family != AF_INET6) 1783 continue; 1784 ifa6 = (struct in6_ifaddr *)ifa; 1785 1786 if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) != 0 && 1787 allow_deprecated == 0) { 1788 /* 1789 * prefererred address should be put before 1790 * deprecated addresses. 1791 */ 1792 1793 /* record the interface for later search */ 1794 if (ifp_dep == NULL) 1795 ifp_dep = ifp; 1796 1797 continue; 1798 } 1799 else if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) == 0 && 1800 allow_deprecated != 0) 1801 continue; /* we now collect deprecated addrs */ 1802 1803 /* What do we have to do about ::1? */ 1804 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) { 1805 case IPV6_ADDR_SCOPE_LINKLOCAL: 1806 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1807 continue; 1808 break; 1809 case IPV6_ADDR_SCOPE_SITELOCAL: 1810 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1811 continue; 1812 break; 1813 case IPV6_ADDR_SCOPE_GLOBAL: 1814 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1815 continue; 1816 break; 1817 default: 1818 continue; 1819 } 1820 1821 /* 1822 * check if anycast is okay. 1823 * XXX: just experimental. not in the spec. 1824 */ 1825 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 && 1826 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0) 1827 continue; 1828 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 && 1829 (icmp6_nodeinfo & 4) == 0) { 1830 continue; 1831 } 1832 1833 /* now we can copy the address */ 1834 if (resid < sizeof(struct in6_addr) + 1835 sizeof(u_int32_t)) { 1836 /* 1837 * We give up much more copy. 1838 * Set the truncate flag and return. 1839 */ 1840 nni6->ni_flags |= 1841 NI_NODEADDR_FLAG_TRUNCATE; 1842 IFNET_RUNLOCK(); 1843 return(copied); 1844 } 1845 1846 /* 1847 * Set the TTL of the address. 1848 * The TTL value should be one of the following 1849 * according to the specification: 1850 * 1851 * 1. The remaining lifetime of a DHCP lease on the 1852 * address, or 1853 * 2. The remaining Valid Lifetime of a prefix from 1854 * which the address was derived through Stateless 1855 * Autoconfiguration. 1856 * 1857 * Note that we currently do not support stateful 1858 * address configuration by DHCPv6, so the former 1859 * case can't happen. 1860 */ 1861 if (ifa6->ia6_lifetime.ia6t_expire == 0) 1862 ltime = ND6_INFINITE_LIFETIME; 1863 else { 1864 if (ifa6->ia6_lifetime.ia6t_expire > 1865 time_second) 1866 ltime = htonl(ifa6->ia6_lifetime.ia6t_expire - time_second); 1867 else 1868 ltime = 0; 1869 } 1870 1871 bcopy(<ime, cp, sizeof(u_int32_t)); 1872 cp += sizeof(u_int32_t); 1873 1874 /* copy the address itself */ 1875 bcopy(&ifa6->ia_addr.sin6_addr, cp, 1876 sizeof(struct in6_addr)); 1877 /* XXX: KAME link-local hack; remove ifindex */ 1878 if (IN6_IS_ADDR_LINKLOCAL(&ifa6->ia_addr.sin6_addr)) 1879 ((struct in6_addr *)cp)->s6_addr16[1] = 0; 1880 cp += sizeof(struct in6_addr); 1881 1882 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1883 copied += (sizeof(struct in6_addr) + 1884 sizeof(u_int32_t)); 1885 } 1886 if (ifp0) /* we need search only on the specified IF */ 1887 break; 1888 } 1889 1890 if (allow_deprecated == 0 && ifp_dep != NULL) { 1891 ifp = ifp_dep; 1892 allow_deprecated = 1; 1893 1894 goto again; 1895 } 1896 1897 IFNET_RUNLOCK(); 1898 1899 return(copied); 1900 } 1901 1902 /* 1903 * XXX almost dup'ed code with rip6_input. 1904 */ 1905 static int 1906 icmp6_rip6_input(mp, off) 1907 struct mbuf **mp; 1908 int off; 1909 { 1910 struct mbuf *m = *mp; 1911 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1912 struct in6pcb *in6p; 1913 struct in6pcb *last = NULL; 1914 struct sockaddr_in6 rip6src; 1915 struct icmp6_hdr *icmp6; 1916 struct mbuf *opts = NULL; 1917 1918 #ifndef PULLDOWN_TEST 1919 /* this is assumed to be safe. */ 1920 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off); 1921 #else 1922 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 1923 if (icmp6 == NULL) { 1924 /* m is already reclaimed */ 1925 return IPPROTO_DONE; 1926 } 1927 #endif 1928 1929 bzero(&rip6src, sizeof(rip6src)); 1930 rip6src.sin6_len = sizeof(struct sockaddr_in6); 1931 rip6src.sin6_family = AF_INET6; 1932 /* KAME hack: recover scopeid */ 1933 (void)in6_recoverscope(&rip6src, &ip6->ip6_src, m->m_pkthdr.rcvif); 1934 1935 LIST_FOREACH(in6p, &ripcb, inp_list) 1936 { 1937 if ((in6p->inp_vflag & INP_IPV6) == 0) 1938 continue; 1939 #ifdef HAVE_NRL_INPCB 1940 if (!(in6p->in6p_flags & INP_IPV6)) 1941 continue; 1942 #endif 1943 if (in6p->in6p_ip6_nxt != IPPROTO_ICMPV6) 1944 continue; 1945 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && 1946 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst)) 1947 continue; 1948 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) && 1949 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src)) 1950 continue; 1951 if (in6p->in6p_icmp6filt 1952 && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type, 1953 in6p->in6p_icmp6filt)) 1954 continue; 1955 if (last) { 1956 struct mbuf *n; 1957 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { 1958 if (last->in6p_flags & IN6P_CONTROLOPTS) 1959 ip6_savecontrol(last, &opts, ip6, n); 1960 /* strip intermediate headers */ 1961 m_adj(n, off); 1962 if (sbappendaddr(&last->in6p_socket->so_rcv, 1963 (struct sockaddr *)&rip6src, 1964 n, opts) == 0) { 1965 /* should notify about lost packet */ 1966 m_freem(n); 1967 if (opts) { 1968 m_freem(opts); 1969 } 1970 } else 1971 sorwakeup(last->in6p_socket); 1972 opts = NULL; 1973 } 1974 } 1975 last = in6p; 1976 } 1977 if (last) { 1978 if (last->in6p_flags & IN6P_CONTROLOPTS) 1979 ip6_savecontrol(last, &opts, ip6, m); 1980 /* strip intermediate headers */ 1981 m_adj(m, off); 1982 if (sbappendaddr(&last->in6p_socket->so_rcv, 1983 (struct sockaddr *)&rip6src, m, opts) == 0) { 1984 m_freem(m); 1985 if (opts) 1986 m_freem(opts); 1987 } else 1988 sorwakeup(last->in6p_socket); 1989 } else { 1990 m_freem(m); 1991 ip6stat.ip6s_delivered--; 1992 } 1993 return IPPROTO_DONE; 1994 } 1995 1996 /* 1997 * Reflect the ip6 packet back to the source. 1998 * OFF points to the icmp6 header, counted from the top of the mbuf. 1999 */ 2000 void 2001 icmp6_reflect(m, off) 2002 struct mbuf *m; 2003 size_t off; 2004 { 2005 struct ip6_hdr *ip6; 2006 struct icmp6_hdr *icmp6; 2007 struct in6_ifaddr *ia; 2008 struct in6_addr t, *src = 0; 2009 int plen; 2010 int type, code; 2011 struct ifnet *outif = NULL; 2012 struct sockaddr_in6 sa6_src, sa6_dst; 2013 #ifdef COMPAT_RFC1885 2014 int mtu = IPV6_MMTU; 2015 struct sockaddr_in6 *sin6 = &icmp6_reflect_rt.ro_dst; 2016 #endif 2017 2018 /* too short to reflect */ 2019 if (off < sizeof(struct ip6_hdr)) { 2020 nd6log((LOG_DEBUG, 2021 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n", 2022 (u_long)off, (u_long)sizeof(struct ip6_hdr), 2023 __FILE__, __LINE__)); 2024 goto bad; 2025 } 2026 2027 /* 2028 * If there are extra headers between IPv6 and ICMPv6, strip 2029 * off that header first. 2030 */ 2031 #ifdef DIAGNOSTIC 2032 if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN) 2033 panic("assumption failed in icmp6_reflect"); 2034 #endif 2035 if (off > sizeof(struct ip6_hdr)) { 2036 size_t l; 2037 struct ip6_hdr nip6; 2038 2039 l = off - sizeof(struct ip6_hdr); 2040 m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6); 2041 m_adj(m, l); 2042 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2043 if (m->m_len < l) { 2044 if ((m = m_pullup(m, l)) == NULL) 2045 return; 2046 } 2047 bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6)); 2048 } else /* off == sizeof(struct ip6_hdr) */ { 2049 size_t l; 2050 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 2051 if (m->m_len < l) { 2052 if ((m = m_pullup(m, l)) == NULL) 2053 return; 2054 } 2055 } 2056 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr); 2057 ip6 = mtod(m, struct ip6_hdr *); 2058 ip6->ip6_nxt = IPPROTO_ICMPV6; 2059 icmp6 = (struct icmp6_hdr *)(ip6 + 1); 2060 type = icmp6->icmp6_type; /* keep type for statistics */ 2061 code = icmp6->icmp6_code; /* ditto. */ 2062 2063 t = ip6->ip6_dst; 2064 /* 2065 * ip6_input() drops a packet if its src is multicast. 2066 * So, the src is never multicast. 2067 */ 2068 ip6->ip6_dst = ip6->ip6_src; 2069 2070 /* 2071 * XXX: make sure to embed scope zone information, using 2072 * already embedded IDs or the received interface (if any). 2073 * Note that rcvif may be NULL. 2074 * TODO: scoped routing case (XXX). 2075 */ 2076 bzero(&sa6_src, sizeof(sa6_src)); 2077 sa6_src.sin6_family = AF_INET6; 2078 sa6_src.sin6_len = sizeof(sa6_src); 2079 sa6_src.sin6_addr = ip6->ip6_dst; 2080 in6_recoverscope(&sa6_src, &ip6->ip6_dst, m->m_pkthdr.rcvif); 2081 in6_embedscope(&ip6->ip6_dst, &sa6_src, NULL, NULL); 2082 bzero(&sa6_dst, sizeof(sa6_dst)); 2083 sa6_dst.sin6_family = AF_INET6; 2084 sa6_dst.sin6_len = sizeof(sa6_dst); 2085 sa6_dst.sin6_addr = t; 2086 in6_recoverscope(&sa6_dst, &t, m->m_pkthdr.rcvif); 2087 in6_embedscope(&t, &sa6_dst, NULL, NULL); 2088 2089 #ifdef COMPAT_RFC1885 2090 /* 2091 * xxx guess MTU 2092 * RFC 1885 requires that echo reply should be truncated if it 2093 * does not fit in with (return) path MTU, but the description was 2094 * removed in the new spec. 2095 */ 2096 if (icmp6_reflect_rt.ro_rt == 0 || 2097 ! (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &ip6->ip6_dst))) { 2098 if (icmp6_reflect_rt.ro_rt) { 2099 RTFREE(icmp6_reflect_rt.ro_rt); 2100 icmp6_reflect_rt.ro_rt = 0; 2101 } 2102 bzero(sin6, sizeof(*sin6)); 2103 sin6->sin6_family = PF_INET6; 2104 sin6->sin6_len = sizeof(struct sockaddr_in6); 2105 sin6->sin6_addr = ip6->ip6_dst; 2106 2107 rtalloc_ign((struct route *)&icmp6_reflect_rt.ro_rt, 2108 RTF_PRCLONING); 2109 } 2110 2111 if (icmp6_reflect_rt.ro_rt == 0) 2112 goto bad; 2113 2114 if ((icmp6_reflect_rt.ro_rt->rt_flags & RTF_HOST) 2115 && mtu < icmp6_reflect_rt.ro_rt->rt_ifp->if_mtu) 2116 mtu = icmp6_reflect_rt.ro_rt->rt_rmx.rmx_mtu; 2117 2118 if (mtu < m->m_pkthdr.len) { 2119 plen -= (m->m_pkthdr.len - mtu); 2120 m_adj(m, mtu - m->m_pkthdr.len); 2121 } 2122 #endif 2123 /* 2124 * If the incoming packet was addressed directly to us(i.e. unicast), 2125 * use dst as the src for the reply. 2126 * The IN6_IFF_NOTREADY case would be VERY rare, but is possible 2127 * (for example) when we encounter an error while forwarding procedure 2128 * destined to a duplicated address of ours. 2129 */ 2130 for (ia = in6_ifaddr; ia; ia = ia->ia_next) 2131 if (IN6_ARE_ADDR_EQUAL(&t, &ia->ia_addr.sin6_addr) && 2132 (ia->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) { 2133 src = &t; 2134 break; 2135 } 2136 if (ia == NULL && IN6_IS_ADDR_LINKLOCAL(&t) && (m->m_flags & M_LOOP)) { 2137 /* 2138 * This is the case if the dst is our link-local address 2139 * and the sender is also ourselves. 2140 */ 2141 src = &t; 2142 } 2143 2144 if (src == 0) { 2145 int e; 2146 struct route_in6 ro; 2147 2148 /* 2149 * This case matches to multicasts, our anycast, or unicasts 2150 * that we do not own. Select a source address based on the 2151 * source address of the erroneous packet. 2152 */ 2153 bzero(&ro, sizeof(ro)); 2154 src = in6_selectsrc(&sa6_src, NULL, NULL, &ro, NULL, &e); 2155 if (ro.ro_rt) 2156 RTFREE(ro.ro_rt); /* XXX: we could use this */ 2157 if (src == NULL) { 2158 nd6log((LOG_DEBUG, 2159 "icmp6_reflect: source can't be determined: " 2160 "dst=%s, error=%d\n", 2161 ip6_sprintf(&sa6_src.sin6_addr), e)); 2162 goto bad; 2163 } 2164 } 2165 2166 ip6->ip6_src = *src; 2167 2168 ip6->ip6_flow = 0; 2169 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2170 ip6->ip6_vfc |= IPV6_VERSION; 2171 ip6->ip6_nxt = IPPROTO_ICMPV6; 2172 if (m->m_pkthdr.rcvif) { 2173 /* XXX: This may not be the outgoing interface */ 2174 ip6->ip6_hlim = nd_ifinfo[m->m_pkthdr.rcvif->if_index].chlim; 2175 } else 2176 ip6->ip6_hlim = ip6_defhlim; 2177 2178 icmp6->icmp6_cksum = 0; 2179 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6, 2180 sizeof(struct ip6_hdr), plen); 2181 2182 /* 2183 * XXX option handling 2184 */ 2185 2186 m->m_flags &= ~(M_BCAST|M_MCAST); 2187 2188 #ifdef COMPAT_RFC1885 2189 ip6_output(m, NULL, &icmp6_reflect_rt, 0, NULL, &outif, NULL); 2190 #else 2191 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL); 2192 #endif 2193 if (outif) 2194 icmp6_ifoutstat_inc(outif, type, code); 2195 2196 return; 2197 2198 bad: 2199 m_freem(m); 2200 return; 2201 } 2202 2203 void 2204 icmp6_fasttimo() 2205 { 2206 2207 mld6_fasttimeo(); 2208 } 2209 2210 static const char * 2211 icmp6_redirect_diag(src6, dst6, tgt6) 2212 struct in6_addr *src6; 2213 struct in6_addr *dst6; 2214 struct in6_addr *tgt6; 2215 { 2216 static char buf[1024]; 2217 snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)", 2218 ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6)); 2219 return buf; 2220 } 2221 2222 void 2223 icmp6_redirect_input(m, off) 2224 struct mbuf *m; 2225 int off; 2226 { 2227 struct ifnet *ifp = m->m_pkthdr.rcvif; 2228 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 2229 struct nd_redirect *nd_rd; 2230 int icmp6len = ntohs(ip6->ip6_plen); 2231 char *lladdr = NULL; 2232 int lladdrlen = 0; 2233 u_char *redirhdr = NULL; 2234 int redirhdrlen = 0; 2235 struct rtentry *rt = NULL; 2236 int is_router; 2237 int is_onlink; 2238 struct in6_addr src6 = ip6->ip6_src; 2239 struct in6_addr redtgt6; 2240 struct in6_addr reddst6; 2241 union nd_opts ndopts; 2242 2243 if (!m || !ifp) 2244 return; 2245 2246 /* XXX if we are router, we don't update route by icmp6 redirect */ 2247 if (ip6_forwarding) 2248 goto freeit; 2249 if (!icmp6_rediraccept) 2250 goto freeit; 2251 2252 #ifndef PULLDOWN_TEST 2253 IP6_EXTHDR_CHECK(m, off, icmp6len,); 2254 nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off); 2255 #else 2256 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len); 2257 if (nd_rd == NULL) { 2258 icmp6stat.icp6s_tooshort++; 2259 return; 2260 } 2261 #endif 2262 redtgt6 = nd_rd->nd_rd_target; 2263 reddst6 = nd_rd->nd_rd_dst; 2264 2265 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 2266 redtgt6.s6_addr16[1] = htons(ifp->if_index); 2267 if (IN6_IS_ADDR_LINKLOCAL(&reddst6)) 2268 reddst6.s6_addr16[1] = htons(ifp->if_index); 2269 2270 /* validation */ 2271 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) { 2272 nd6log((LOG_ERR, 2273 "ICMP6 redirect sent from %s rejected; " 2274 "must be from linklocal\n", ip6_sprintf(&src6))); 2275 goto bad; 2276 } 2277 if (ip6->ip6_hlim != 255) { 2278 nd6log((LOG_ERR, 2279 "ICMP6 redirect sent from %s rejected; " 2280 "hlim=%d (must be 255)\n", 2281 ip6_sprintf(&src6), ip6->ip6_hlim)); 2282 goto bad; 2283 } 2284 { 2285 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */ 2286 struct sockaddr_in6 sin6; 2287 struct in6_addr *gw6; 2288 2289 bzero(&sin6, sizeof(sin6)); 2290 sin6.sin6_family = AF_INET6; 2291 sin6.sin6_len = sizeof(struct sockaddr_in6); 2292 bcopy(&reddst6, &sin6.sin6_addr, sizeof(reddst6)); 2293 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL); 2294 if (rt) { 2295 if (rt->rt_gateway == NULL || 2296 rt->rt_gateway->sa_family != AF_INET6) { 2297 nd6log((LOG_ERR, 2298 "ICMP6 redirect rejected; no route " 2299 "with inet6 gateway found for redirect dst: %s\n", 2300 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2301 RTFREE(rt); 2302 goto bad; 2303 } 2304 2305 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr); 2306 if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) { 2307 nd6log((LOG_ERR, 2308 "ICMP6 redirect rejected; " 2309 "not equal to gw-for-src=%s (must be same): " 2310 "%s\n", 2311 ip6_sprintf(gw6), 2312 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2313 RTFREE(rt); 2314 goto bad; 2315 } 2316 } else { 2317 nd6log((LOG_ERR, 2318 "ICMP6 redirect rejected; " 2319 "no route found for redirect dst: %s\n", 2320 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2321 goto bad; 2322 } 2323 RTFREE(rt); 2324 rt = NULL; 2325 } 2326 if (IN6_IS_ADDR_MULTICAST(&reddst6)) { 2327 nd6log((LOG_ERR, 2328 "ICMP6 redirect rejected; " 2329 "redirect dst must be unicast: %s\n", 2330 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2331 goto bad; 2332 } 2333 2334 is_router = is_onlink = 0; 2335 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 2336 is_router = 1; /* router case */ 2337 if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0) 2338 is_onlink = 1; /* on-link destination case */ 2339 if (!is_router && !is_onlink) { 2340 nd6log((LOG_ERR, 2341 "ICMP6 redirect rejected; " 2342 "neither router case nor onlink case: %s\n", 2343 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2344 goto bad; 2345 } 2346 /* validation passed */ 2347 2348 icmp6len -= sizeof(*nd_rd); 2349 nd6_option_init(nd_rd + 1, icmp6len, &ndopts); 2350 if (nd6_options(&ndopts) < 0) { 2351 nd6log((LOG_INFO, "icmp6_redirect_input: " 2352 "invalid ND option, rejected: %s\n", 2353 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2354 /* nd6_options have incremented stats */ 2355 goto freeit; 2356 } 2357 2358 if (ndopts.nd_opts_tgt_lladdr) { 2359 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 2360 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 2361 } 2362 2363 if (ndopts.nd_opts_rh) { 2364 redirhdrlen = ndopts.nd_opts_rh->nd_opt_rh_len; 2365 redirhdr = (u_char *)(ndopts.nd_opts_rh + 1); /* xxx */ 2366 } 2367 2368 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 2369 nd6log((LOG_INFO, 2370 "icmp6_redirect_input: lladdrlen mismatch for %s " 2371 "(if %d, icmp6 packet %d): %s\n", 2372 ip6_sprintf(&redtgt6), ifp->if_addrlen, lladdrlen - 2, 2373 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2374 goto bad; 2375 } 2376 2377 /* RFC 2461 8.3 */ 2378 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT, 2379 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER); 2380 2381 if (!is_onlink) { /* better router case. perform rtredirect. */ 2382 /* perform rtredirect */ 2383 struct sockaddr_in6 sdst; 2384 struct sockaddr_in6 sgw; 2385 struct sockaddr_in6 ssrc; 2386 2387 bzero(&sdst, sizeof(sdst)); 2388 bzero(&sgw, sizeof(sgw)); 2389 bzero(&ssrc, sizeof(ssrc)); 2390 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6; 2391 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len = 2392 sizeof(struct sockaddr_in6); 2393 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr)); 2394 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2395 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr)); 2396 rtredirect((struct sockaddr *)&sdst, (struct sockaddr *)&sgw, 2397 (struct sockaddr *)NULL, RTF_GATEWAY | RTF_HOST, 2398 (struct sockaddr *)&ssrc, 2399 (struct rtentry **)NULL); 2400 } 2401 /* finally update cached route in each socket via pfctlinput */ 2402 { 2403 struct sockaddr_in6 sdst; 2404 2405 bzero(&sdst, sizeof(sdst)); 2406 sdst.sin6_family = AF_INET6; 2407 sdst.sin6_len = sizeof(struct sockaddr_in6); 2408 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2409 pfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst); 2410 #ifdef IPSEC 2411 key_sa_routechange((struct sockaddr *)&sdst); 2412 #endif 2413 } 2414 2415 freeit: 2416 m_freem(m); 2417 return; 2418 2419 bad: 2420 icmp6stat.icp6s_badredirect++; 2421 m_freem(m); 2422 } 2423 2424 void 2425 icmp6_redirect_output(m0, rt) 2426 struct mbuf *m0; 2427 struct rtentry *rt; 2428 { 2429 struct ifnet *ifp; /* my outgoing interface */ 2430 struct in6_addr *ifp_ll6; 2431 struct in6_addr *router_ll6; 2432 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */ 2433 struct mbuf *m = NULL; /* newly allocated one */ 2434 struct ip6_hdr *ip6; /* m as struct ip6_hdr */ 2435 struct nd_redirect *nd_rd; 2436 size_t maxlen; 2437 u_char *p; 2438 struct ifnet *outif = NULL; 2439 struct sockaddr_in6 src_sa; 2440 2441 icmp6_errcount(&icmp6stat.icp6s_outerrhist, ND_REDIRECT, 0); 2442 2443 /* if we are not router, we don't send icmp6 redirect */ 2444 if (!ip6_forwarding || ip6_accept_rtadv) 2445 goto fail; 2446 2447 /* sanity check */ 2448 if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp)) 2449 goto fail; 2450 2451 /* 2452 * Address check: 2453 * the source address must identify a neighbor, and 2454 * the destination address must not be a multicast address 2455 * [RFC 2461, sec 8.2] 2456 */ 2457 sip6 = mtod(m0, struct ip6_hdr *); 2458 bzero(&src_sa, sizeof(src_sa)); 2459 src_sa.sin6_family = AF_INET6; 2460 src_sa.sin6_len = sizeof(src_sa); 2461 src_sa.sin6_addr = sip6->ip6_src; 2462 /* we don't currently use sin6_scope_id, but eventually use it */ 2463 src_sa.sin6_scope_id = in6_addr2scopeid(ifp, &sip6->ip6_src); 2464 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0) 2465 goto fail; 2466 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst)) 2467 goto fail; /* what should we do here? */ 2468 2469 /* rate limit */ 2470 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0)) 2471 goto fail; 2472 2473 /* 2474 * Since we are going to append up to 1280 bytes (= IPV6_MMTU), 2475 * we almost always ask for an mbuf cluster for simplicity. 2476 * (MHLEN < IPV6_MMTU is almost always true) 2477 */ 2478 #if IPV6_MMTU >= MCLBYTES 2479 # error assumption failed about IPV6_MMTU and MCLBYTES 2480 #endif 2481 MGETHDR(m, M_DONTWAIT, MT_HEADER); 2482 if (m && IPV6_MMTU >= MHLEN) 2483 MCLGET(m, M_DONTWAIT); 2484 if (!m) 2485 goto fail; 2486 m->m_pkthdr.rcvif = NULL; 2487 m->m_len = 0; 2488 maxlen = M_TRAILINGSPACE(m); 2489 maxlen = min(IPV6_MMTU, maxlen); 2490 /* just for safety */ 2491 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) + 2492 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) { 2493 goto fail; 2494 } 2495 2496 { 2497 /* get ip6 linklocal address for ifp(my outgoing interface). */ 2498 struct in6_ifaddr *ia; 2499 if ((ia = in6ifa_ifpforlinklocal(ifp, 2500 IN6_IFF_NOTREADY| 2501 IN6_IFF_ANYCAST)) == NULL) 2502 goto fail; 2503 ifp_ll6 = &ia->ia_addr.sin6_addr; 2504 } 2505 2506 /* get ip6 linklocal address for the router. */ 2507 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) { 2508 struct sockaddr_in6 *sin6; 2509 sin6 = (struct sockaddr_in6 *)rt->rt_gateway; 2510 router_ll6 = &sin6->sin6_addr; 2511 if (!IN6_IS_ADDR_LINKLOCAL(router_ll6)) 2512 router_ll6 = (struct in6_addr *)NULL; 2513 } else 2514 router_ll6 = (struct in6_addr *)NULL; 2515 2516 /* ip6 */ 2517 ip6 = mtod(m, struct ip6_hdr *); 2518 ip6->ip6_flow = 0; 2519 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2520 ip6->ip6_vfc |= IPV6_VERSION; 2521 /* ip6->ip6_plen will be set later */ 2522 ip6->ip6_nxt = IPPROTO_ICMPV6; 2523 ip6->ip6_hlim = 255; 2524 /* ip6->ip6_src must be linklocal addr for my outgoing if. */ 2525 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr)); 2526 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr)); 2527 2528 /* ND Redirect */ 2529 nd_rd = (struct nd_redirect *)(ip6 + 1); 2530 nd_rd->nd_rd_type = ND_REDIRECT; 2531 nd_rd->nd_rd_code = 0; 2532 nd_rd->nd_rd_reserved = 0; 2533 if (rt->rt_flags & RTF_GATEWAY) { 2534 /* 2535 * nd_rd->nd_rd_target must be a link-local address in 2536 * better router cases. 2537 */ 2538 if (!router_ll6) 2539 goto fail; 2540 bcopy(router_ll6, &nd_rd->nd_rd_target, 2541 sizeof(nd_rd->nd_rd_target)); 2542 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2543 sizeof(nd_rd->nd_rd_dst)); 2544 } else { 2545 /* make sure redtgt == reddst */ 2546 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target, 2547 sizeof(nd_rd->nd_rd_target)); 2548 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2549 sizeof(nd_rd->nd_rd_dst)); 2550 } 2551 2552 p = (u_char *)(nd_rd + 1); 2553 2554 if (!router_ll6) 2555 goto nolladdropt; 2556 2557 { 2558 /* target lladdr option */ 2559 struct rtentry *rt_router = NULL; 2560 int len; 2561 struct sockaddr_dl *sdl; 2562 struct nd_opt_hdr *nd_opt; 2563 char *lladdr; 2564 2565 rt_router = nd6_lookup(router_ll6, 0, ifp); 2566 if (!rt_router) 2567 goto nolladdropt; 2568 len = sizeof(*nd_opt) + ifp->if_addrlen; 2569 len = (len + 7) & ~7; /* round by 8 */ 2570 /* safety check */ 2571 if (len + (p - (u_char *)ip6) > maxlen) 2572 goto nolladdropt; 2573 if (!(rt_router->rt_flags & RTF_GATEWAY) && 2574 (rt_router->rt_flags & RTF_LLINFO) && 2575 (rt_router->rt_gateway->sa_family == AF_LINK) && 2576 (sdl = (struct sockaddr_dl *)rt_router->rt_gateway) && 2577 sdl->sdl_alen) { 2578 nd_opt = (struct nd_opt_hdr *)p; 2579 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 2580 nd_opt->nd_opt_len = len >> 3; 2581 lladdr = (char *)(nd_opt + 1); 2582 bcopy(LLADDR(sdl), lladdr, ifp->if_addrlen); 2583 p += len; 2584 } 2585 } 2586 nolladdropt:; 2587 2588 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2589 2590 /* just to be safe */ 2591 #ifdef M_DECRYPTED /*not openbsd*/ 2592 if (m0->m_flags & M_DECRYPTED) 2593 goto noredhdropt; 2594 #endif 2595 if (p - (u_char *)ip6 > maxlen) 2596 goto noredhdropt; 2597 2598 { 2599 /* redirected header option */ 2600 int len; 2601 struct nd_opt_rd_hdr *nd_opt_rh; 2602 2603 /* 2604 * compute the maximum size for icmp6 redirect header option. 2605 * XXX room for auth header? 2606 */ 2607 len = maxlen - (p - (u_char *)ip6); 2608 len &= ~7; 2609 2610 /* This is just for simplicity. */ 2611 if (m0->m_pkthdr.len != m0->m_len) { 2612 if (m0->m_next) { 2613 m_freem(m0->m_next); 2614 m0->m_next = NULL; 2615 } 2616 m0->m_pkthdr.len = m0->m_len; 2617 } 2618 2619 /* 2620 * Redirected header option spec (RFC2461 4.6.3) talks nothing 2621 * about padding/truncate rule for the original IP packet. 2622 * From the discussion on IPv6imp in Feb 1999, the consensus was: 2623 * - "attach as much as possible" is the goal 2624 * - pad if not aligned (original size can be guessed by original 2625 * ip6 header) 2626 * Following code adds the padding if it is simple enough, 2627 * and truncates if not. 2628 */ 2629 if (m0->m_next || m0->m_pkthdr.len != m0->m_len) 2630 panic("assumption failed in %s:%d", __FILE__, __LINE__); 2631 2632 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) { 2633 /* not enough room, truncate */ 2634 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh); 2635 } else { 2636 /* enough room, pad or truncate */ 2637 size_t extra; 2638 2639 extra = m0->m_pkthdr.len % 8; 2640 if (extra) { 2641 /* pad if easy enough, truncate if not */ 2642 if (8 - extra <= M_TRAILINGSPACE(m0)) { 2643 /* pad */ 2644 m0->m_len += (8 - extra); 2645 m0->m_pkthdr.len += (8 - extra); 2646 } else { 2647 /* truncate */ 2648 m0->m_pkthdr.len -= extra; 2649 m0->m_len -= extra; 2650 } 2651 } 2652 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh); 2653 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh); 2654 } 2655 2656 nd_opt_rh = (struct nd_opt_rd_hdr *)p; 2657 bzero(nd_opt_rh, sizeof(*nd_opt_rh)); 2658 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER; 2659 nd_opt_rh->nd_opt_rh_len = len >> 3; 2660 p += sizeof(*nd_opt_rh); 2661 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2662 2663 /* connect m0 to m */ 2664 m_tag_delete_chain(m0, NULL); 2665 m0->m_flags &= ~M_PKTHDR; 2666 m->m_next = m0; 2667 m->m_pkthdr.len = m->m_len + m0->m_len; 2668 m0 = NULL; 2669 } 2670 noredhdropt:; 2671 if (m0) { 2672 m_freem(m0); 2673 m0 = NULL; 2674 } 2675 2676 if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_src)) 2677 sip6->ip6_src.s6_addr16[1] = 0; 2678 if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_dst)) 2679 sip6->ip6_dst.s6_addr16[1] = 0; 2680 #if 0 2681 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src)) 2682 ip6->ip6_src.s6_addr16[1] = 0; 2683 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) 2684 ip6->ip6_dst.s6_addr16[1] = 0; 2685 #endif 2686 if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_target)) 2687 nd_rd->nd_rd_target.s6_addr16[1] = 0; 2688 if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_dst)) 2689 nd_rd->nd_rd_dst.s6_addr16[1] = 0; 2690 2691 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 2692 2693 nd_rd->nd_rd_cksum = 0; 2694 nd_rd->nd_rd_cksum 2695 = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen)); 2696 2697 /* send the packet to outside... */ 2698 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL); 2699 if (outif) { 2700 icmp6_ifstat_inc(outif, ifs6_out_msg); 2701 icmp6_ifstat_inc(outif, ifs6_out_redirect); 2702 } 2703 icmp6stat.icp6s_outhist[ND_REDIRECT]++; 2704 2705 return; 2706 2707 fail: 2708 if (m) 2709 m_freem(m); 2710 if (m0) 2711 m_freem(m0); 2712 } 2713 2714 #ifdef HAVE_NRL_INPCB 2715 #define sotoin6pcb sotoinpcb 2716 #define in6pcb inpcb 2717 #define in6p_icmp6filt inp_icmp6filt 2718 #endif 2719 /* 2720 * ICMPv6 socket option processing. 2721 */ 2722 int 2723 icmp6_ctloutput(so, sopt) 2724 struct socket *so; 2725 struct sockopt *sopt; 2726 { 2727 int error = 0; 2728 int optlen; 2729 struct inpcb *inp = sotoinpcb(so); 2730 int level, op, optname; 2731 2732 if (sopt) { 2733 level = sopt->sopt_level; 2734 op = sopt->sopt_dir; 2735 optname = sopt->sopt_name; 2736 optlen = sopt->sopt_valsize; 2737 } else 2738 level = op = optname = optlen = 0; 2739 2740 if (level != IPPROTO_ICMPV6) { 2741 return EINVAL; 2742 } 2743 2744 switch (op) { 2745 case PRCO_SETOPT: 2746 switch (optname) { 2747 case ICMP6_FILTER: 2748 { 2749 struct icmp6_filter *p; 2750 2751 if (optlen != sizeof(*p)) { 2752 error = EMSGSIZE; 2753 break; 2754 } 2755 if (inp->in6p_icmp6filt == NULL) { 2756 error = EINVAL; 2757 break; 2758 } 2759 error = sooptcopyin(sopt, inp->in6p_icmp6filt, optlen, 2760 optlen); 2761 break; 2762 } 2763 2764 default: 2765 error = ENOPROTOOPT; 2766 break; 2767 } 2768 break; 2769 2770 case PRCO_GETOPT: 2771 switch (optname) { 2772 case ICMP6_FILTER: 2773 { 2774 if (inp->in6p_icmp6filt == NULL) { 2775 error = EINVAL; 2776 break; 2777 } 2778 error = sooptcopyout(sopt, inp->in6p_icmp6filt, 2779 sizeof(struct icmp6_filter)); 2780 break; 2781 } 2782 2783 default: 2784 error = ENOPROTOOPT; 2785 break; 2786 } 2787 break; 2788 } 2789 2790 return(error); 2791 } 2792 #ifdef HAVE_NRL_INPCB 2793 #undef sotoin6pcb 2794 #undef in6pcb 2795 #undef in6p_icmp6filt 2796 #endif 2797 2798 #ifndef HAVE_PPSRATECHECK 2799 #ifndef timersub 2800 #define timersub(tvp, uvp, vvp) \ 2801 do { \ 2802 (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec; \ 2803 (vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec; \ 2804 if ((vvp)->tv_usec < 0) { \ 2805 (vvp)->tv_sec--; \ 2806 (vvp)->tv_usec += 1000000; \ 2807 } \ 2808 } while (0) 2809 #endif 2810 2811 /* 2812 * ppsratecheck(): packets (or events) per second limitation. 2813 */ 2814 static int 2815 ppsratecheck(lasttime, curpps, maxpps) 2816 struct timeval *lasttime; 2817 int *curpps; 2818 int maxpps; /* maximum pps allowed */ 2819 { 2820 struct timeval tv, delta; 2821 int s, rv; 2822 2823 s = splclock(); 2824 microtime(&tv); 2825 splx(s); 2826 2827 timersub(&tv, lasttime, &delta); 2828 2829 /* 2830 * Check for 0,0 so that the message will be seen at least once. 2831 * If more than one second has passed since the last update of 2832 * lasttime, reset the counter. 2833 * 2834 * We do increment *curpps even in *curpps < maxpps case, as some may 2835 * try to use *curpps for stat purposes as well. 2836 */ 2837 if ((lasttime->tv_sec == 0 && lasttime->tv_usec == 0) || 2838 delta.tv_sec >= 1) { 2839 *lasttime = tv; 2840 *curpps = 0; 2841 rv = 1; 2842 } else if (maxpps < 0) 2843 rv = 1; 2844 else if (*curpps < maxpps) 2845 rv = 1; 2846 else 2847 rv = 0; 2848 2849 #if 1 /* DIAGNOSTIC? */ 2850 /* be careful about wrap-around */ 2851 if (*curpps + 1 > *curpps) 2852 *curpps = *curpps + 1; 2853 #else 2854 /* 2855 * assume that there's not too many calls to this function. 2856 * not sure if the assumption holds, as it depends on *caller's* 2857 * behavior, not the behavior of this function. 2858 * IMHO it is wrong to make assumption on the caller's behavior, 2859 * so the above #if is #if 1, not #ifdef DIAGNOSTIC. 2860 */ 2861 *curpps = *curpps + 1; 2862 #endif 2863 2864 return (rv); 2865 } 2866 #endif 2867 2868 /* 2869 * Perform rate limit check. 2870 * Returns 0 if it is okay to send the icmp6 packet. 2871 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate 2872 * limitation. 2873 * 2874 * XXX per-destination/type check necessary? 2875 */ 2876 static int 2877 icmp6_ratelimit(dst, type, code) 2878 const struct in6_addr *dst; /* not used at this moment */ 2879 const int type; /* not used at this moment */ 2880 const int code; /* not used at this moment */ 2881 { 2882 int ret; 2883 2884 ret = 0; /* okay to send */ 2885 2886 /* PPS limit */ 2887 if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count, 2888 icmp6errppslim)) { 2889 /* The packet is subject to rate limit */ 2890 ret++; 2891 } 2892 2893 return ret; 2894 } 2895