1 /* $FreeBSD: src/sys/netinet6/icmp6.c,v 1.6.2.13 2003/05/06 06:46:58 suz Exp $ */ 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. Neither the name of the University nor the names of its contributors 46 * may be used to endorse or promote products derived from this software 47 * without specific prior written permission. 48 * 49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 59 * SUCH DAMAGE. 60 * 61 * @(#)ip_icmp.c 8.2 (Berkeley) 1/4/94 62 */ 63 64 #include "opt_inet.h" 65 #include "opt_inet6.h" 66 #include "opt_ipsec.h" 67 68 #include <sys/param.h> 69 #include <sys/systm.h> 70 #include <sys/malloc.h> 71 #include <sys/mbuf.h> 72 #include <sys/protosw.h> 73 #include <sys/socket.h> 74 #include <sys/socketvar.h> 75 #include <sys/socketops.h> 76 #include <sys/time.h> 77 #include <sys/kernel.h> 78 #include <sys/syslog.h> 79 #include <sys/domain.h> 80 81 #include <sys/thread2.h> 82 #include <sys/msgport2.h> 83 84 #include <net/if.h> 85 #include <net/route.h> 86 #include <net/if_dl.h> 87 #include <net/if_types.h> 88 89 #include <netinet/in.h> 90 #include <netinet/in_var.h> 91 #include <netinet/ip6.h> 92 #include <netinet6/ip6_var.h> 93 #include <netinet/icmp6.h> 94 #include <netinet6/mld6_var.h> 95 #include <netinet/in_pcb.h> 96 #include <netinet6/in6_pcb.h> 97 #include <netinet6/nd6.h> 98 #include <netinet6/in6_ifattach.h> 99 #include <netinet6/ip6protosw.h> 100 101 #ifdef IPSEC 102 #include <netinet6/ipsec.h> 103 #include <netproto/key/key.h> 104 #endif 105 106 #ifdef FAST_IPSEC 107 #include <netproto/ipsec/ipsec.h> 108 #include <netproto/ipsec/key.h> 109 #define IPSEC 110 #endif 111 112 #include <net/net_osdep.h> 113 114 #ifdef HAVE_NRL_INPCB 115 /* inpcb members */ 116 #define in6pcb inpcb 117 #define in6p_laddr inp_laddr6 118 #define in6p_faddr inp_faddr6 119 #define in6p_icmp6filt inp_icmp6filt 120 #define in6p_route inp_route 121 #define in6p_socket inp_socket 122 #define in6p_flags inp_flags 123 #define in6p_moptions inp_moptions6 124 #define in6p_outputopts inp_outputopts6 125 #define in6p_ip6 inp_ipv6 126 #define in6p_flowinfo inp_flowinfo 127 #define in6p_sp inp_sp 128 #define in6p_next inp_next 129 #define in6p_prev inp_prev 130 /* function names */ 131 #define in6_pcbdetach in_pcbdetach 132 #define in6_rtchange in_rtchange 133 134 /* 135 * for KAME src sync over BSD*'s. XXX: FreeBSD (>=3) are VERY different from 136 * others... 137 */ 138 #define in6p_ip6_nxt inp_ipv6.ip6_nxt 139 #endif 140 141 /* 142 * ppratecheck() is available, so define it here. 143 */ 144 #define HAVE_PPSRATECHECK 145 146 extern struct domain inet6domain; 147 extern struct protosw inet6sw[]; 148 extern u_char ip6_protox[]; 149 150 struct icmp6stat icmp6stat; 151 152 extern struct inpcbinfo ripcbinfo; 153 extern int icmp6errppslim; 154 static int icmp6errpps_count = 0; 155 static struct timeval icmp6errppslim_last; 156 extern int icmp6_nodeinfo; 157 158 static void icmp6_errcount (struct icmp6errstat *, int, int); 159 static int icmp6_rip6_input (struct mbuf **, int); 160 static int icmp6_ratelimit (const struct in6_addr *, const int, const int); 161 static const char *icmp6_redirect_diag (struct in6_addr *, 162 struct in6_addr *, struct in6_addr *); 163 #ifndef HAVE_PPSRATECHECK 164 static int ppsratecheck (struct timeval *, int *, int); 165 #endif 166 static struct mbuf *ni6_input (struct mbuf *, int); 167 static struct mbuf *ni6_nametodns (const char *, int, int); 168 static int ni6_dnsmatch (const char *, int, const char *, int); 169 static int ni6_addrs (struct icmp6_nodeinfo *, struct mbuf *, 170 struct ifnet **, char *); 171 static int ni6_store_addrs (struct icmp6_nodeinfo *, struct icmp6_nodeinfo *, 172 struct ifnet *, int); 173 static int icmp6_notify_error (struct mbuf *, int, int, int); 174 175 #ifdef COMPAT_RFC1885 176 static struct route_in6 icmp6_reflect_rt; 177 #endif 178 179 180 void 181 icmp6_init(void) 182 { 183 mld6_init(); 184 } 185 186 static void 187 icmp6_errcount(struct icmp6errstat *stat, int type, int 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(struct mbuf *m, int type, int code, int param) 247 { 248 struct ip6_hdr *oip6, *nip6; 249 struct icmp6_hdr *icmp6; 250 u_int preplen; 251 int off; 252 int nxt; 253 254 icmp6stat.icp6s_error++; 255 256 /* count per-type-code statistics */ 257 icmp6_errcount(&icmp6stat.icp6s_outerrhist, type, code); 258 259 #ifdef M_DECRYPTED /*not openbsd*/ 260 if (m->m_flags & M_DECRYPTED) { 261 icmp6stat.icp6s_canterror++; 262 goto freeit; 263 } 264 #endif 265 266 #ifndef PULLDOWN_TEST 267 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), ); 268 #else 269 if (m->m_len < sizeof(struct ip6_hdr)) { 270 m = m_pullup(m, sizeof(struct ip6_hdr)); 271 if (m == NULL) 272 return; 273 } 274 #endif 275 oip6 = mtod(m, struct ip6_hdr *); 276 277 /* 278 * Multicast destination check. For unrecognized option errors, 279 * this check has already done in ip6_unknown_opt(), so we can 280 * check only for other errors. 281 */ 282 if ((m->m_flags & (M_BCAST|M_MCAST) || 283 IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) && 284 (type != ICMP6_PACKET_TOO_BIG && 285 (type != ICMP6_PARAM_PROB || 286 code != ICMP6_PARAMPROB_OPTION))) 287 goto freeit; 288 289 /* Source address check. XXX: the case of anycast source? */ 290 if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) || 291 IN6_IS_ADDR_MULTICAST(&oip6->ip6_src)) 292 goto freeit; 293 294 /* 295 * If we are about to send ICMPv6 against ICMPv6 error/redirect, 296 * don't do it. 297 */ 298 nxt = -1; 299 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 300 if (off >= 0 && nxt == IPPROTO_ICMPV6) { 301 struct icmp6_hdr *icp; 302 303 #ifndef PULLDOWN_TEST 304 IP6_EXTHDR_CHECK(m, 0, off + sizeof(struct icmp6_hdr), ); 305 icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 306 #else 307 IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off, 308 sizeof(*icp)); 309 if (icp == NULL) { 310 icmp6stat.icp6s_tooshort++; 311 return; 312 } 313 #endif 314 if (icp->icmp6_type < ICMP6_ECHO_REQUEST || 315 icp->icmp6_type == ND_REDIRECT) { 316 /* 317 * ICMPv6 error 318 * Special case: for redirect (which is 319 * informational) we must not send icmp6 error. 320 */ 321 icmp6stat.icp6s_canterror++; 322 goto freeit; 323 } else { 324 /* ICMPv6 informational - send the error */ 325 } 326 } else { 327 /* non-ICMPv6 - send the error */ 328 } 329 330 oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */ 331 332 /* Finally, do rate limitation check. */ 333 if (icmp6_ratelimit(&oip6->ip6_src, type, code)) { 334 icmp6stat.icp6s_toofreq++; 335 goto freeit; 336 } 337 338 /* 339 * OK, ICMP6 can be generated. 340 */ 341 342 if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN) 343 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len); 344 345 preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 346 M_PREPEND(m, preplen, M_NOWAIT); 347 if (m && m->m_len < preplen) 348 m = m_pullup(m, preplen); 349 if (m == NULL) { 350 nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__)); 351 return; 352 } 353 354 nip6 = mtod(m, struct ip6_hdr *); 355 nip6->ip6_src = oip6->ip6_src; 356 nip6->ip6_dst = oip6->ip6_dst; 357 358 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_src)) 359 oip6->ip6_src.s6_addr16[1] = 0; 360 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_dst)) 361 oip6->ip6_dst.s6_addr16[1] = 0; 362 363 icmp6 = (struct icmp6_hdr *)(nip6 + 1); 364 icmp6->icmp6_type = type; 365 icmp6->icmp6_code = code; 366 icmp6->icmp6_pptr = htonl((u_int32_t)param); 367 368 /* 369 * icmp6_reflect() is designed to be in the input path. 370 * icmp6_error() can be called from both input and outut path, 371 * and if we are in output path rcvif could contain bogus value. 372 * clear m->m_pkthdr.rcvif for safety, we should have enough scope 373 * information in ip header (nip6). 374 */ 375 m->m_pkthdr.rcvif = NULL; 376 377 icmp6stat.icp6s_outhist[type]++; 378 icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */ 379 380 return; 381 382 freeit: 383 /* 384 * If we can't tell wheter or not we can generate ICMP6, free it. 385 */ 386 m_freem(m); 387 } 388 389 /* 390 * Process a received ICMP6 message. 391 */ 392 int 393 icmp6_input(struct mbuf **mp, int *offp, int proto) 394 { 395 struct mbuf *m = *mp, *n; 396 struct ip6_hdr *ip6, *nip6; 397 struct icmp6_hdr *icmp6, *nicmp6; 398 int off = *offp; 399 int icmp6len = m->m_pkthdr.len - *offp; 400 int code, sum, noff; 401 402 #ifndef PULLDOWN_TEST 403 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr), IPPROTO_DONE); 404 /* m might change if M_LOOP. So, call mtod after this */ 405 #endif 406 407 /* 408 * Locate icmp6 structure in mbuf, and check 409 * that not corrupted and of at least minimum length 410 */ 411 412 ip6 = mtod(m, struct ip6_hdr *); 413 if (icmp6len < sizeof(struct icmp6_hdr)) { 414 icmp6stat.icp6s_tooshort++; 415 goto freeit; 416 } 417 418 /* 419 * calculate the checksum 420 */ 421 #ifndef PULLDOWN_TEST 422 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off); 423 #else 424 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 425 if (icmp6 == NULL) { 426 icmp6stat.icp6s_tooshort++; 427 return IPPROTO_DONE; 428 } 429 #endif 430 code = icmp6->icmp6_code; 431 432 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) { 433 nd6log((LOG_ERR, 434 "ICMP6 checksum error(%d|%x) %s\n", 435 icmp6->icmp6_type, sum, ip6_sprintf(&ip6->ip6_src))); 436 icmp6stat.icp6s_checksum++; 437 goto freeit; 438 } 439 440 if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) { 441 /* 442 * Deliver very specific ICMP6 type only. 443 * This is important to deilver TOOBIG. Otherwise PMTUD 444 * will not work. 445 */ 446 switch (icmp6->icmp6_type) { 447 case ICMP6_DST_UNREACH: 448 case ICMP6_PACKET_TOO_BIG: 449 case ICMP6_TIME_EXCEEDED: 450 break; 451 default: 452 goto freeit; 453 } 454 } 455 456 icmp6stat.icp6s_inhist[icmp6->icmp6_type]++; 457 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_msg); 458 if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK) 459 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error); 460 461 switch (icmp6->icmp6_type) { 462 case ICMP6_DST_UNREACH: 463 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_dstunreach); 464 switch (code) { 465 case ICMP6_DST_UNREACH_NOROUTE: 466 code = PRC_UNREACH_NET; 467 break; 468 case ICMP6_DST_UNREACH_ADMIN: 469 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_adminprohib); 470 code = PRC_UNREACH_PROTOCOL; /* is this a good code? */ 471 break; 472 case ICMP6_DST_UNREACH_ADDR: 473 code = PRC_HOSTDEAD; 474 break; 475 #ifdef COMPAT_RFC1885 476 case ICMP6_DST_UNREACH_NOTNEIGHBOR: 477 code = PRC_UNREACH_SRCFAIL; 478 break; 479 #else 480 case ICMP6_DST_UNREACH_BEYONDSCOPE: 481 /* I mean "source address was incorrect." */ 482 code = PRC_PARAMPROB; 483 break; 484 #endif 485 case ICMP6_DST_UNREACH_NOPORT: 486 code = PRC_UNREACH_PORT; 487 break; 488 default: 489 goto badcode; 490 } 491 goto deliver; 492 break; 493 494 case ICMP6_PACKET_TOO_BIG: 495 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_pkttoobig); 496 if (code != 0) 497 goto badcode; 498 499 code = PRC_MSGSIZE; 500 501 /* 502 * Updating the path MTU will be done after examining 503 * intermediate extension headers. 504 */ 505 goto deliver; 506 break; 507 508 case ICMP6_TIME_EXCEEDED: 509 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_timeexceed); 510 switch (code) { 511 case ICMP6_TIME_EXCEED_TRANSIT: 512 case ICMP6_TIME_EXCEED_REASSEMBLY: 513 code += PRC_TIMXCEED_INTRANS; 514 break; 515 default: 516 goto badcode; 517 } 518 goto deliver; 519 break; 520 521 case ICMP6_PARAM_PROB: 522 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_paramprob); 523 switch (code) { 524 case ICMP6_PARAMPROB_NEXTHEADER: 525 code = PRC_UNREACH_PROTOCOL; 526 break; 527 case ICMP6_PARAMPROB_HEADER: 528 case ICMP6_PARAMPROB_OPTION: 529 code = PRC_PARAMPROB; 530 break; 531 default: 532 goto badcode; 533 } 534 goto deliver; 535 break; 536 537 case ICMP6_ECHO_REQUEST: 538 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echo); 539 if (code != 0) 540 goto badcode; 541 if ((n = m_copy(m, 0, M_COPYALL)) == NULL) { 542 /* Give up remote */ 543 break; 544 } 545 if ((n->m_flags & M_EXT) || 546 n->m_len < off + sizeof(struct icmp6_hdr)) { 547 struct mbuf *n0 = n; 548 const int maxlen = sizeof(*nip6) + sizeof(*nicmp6); 549 int n0len; 550 551 /* 552 * Prepare an internal mbuf. m_pullup() doesn't 553 * always copy the length we specified. 554 */ 555 if (maxlen >= MCLBYTES) { 556 /* Give up remote */ 557 m_freem(n0); 558 break; 559 } 560 n = m_getb(maxlen, M_NOWAIT, n0->m_type, M_PKTHDR); 561 if (n == NULL) { 562 /* Give up remote */ 563 m_freem(n0); 564 break; 565 } 566 n0len = n0->m_pkthdr.len; /* save for use below */ 567 M_MOVE_PKTHDR(n, n0); 568 /* 569 * Copy IPv6 and ICMPv6 only. 570 */ 571 nip6 = mtod(n, struct ip6_hdr *); 572 bcopy(ip6, nip6, sizeof(struct ip6_hdr)); 573 nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 574 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); 575 noff = sizeof(struct ip6_hdr); 576 /* new mbuf contains only ipv6+icmpv6 headers */ 577 n->m_len = noff + sizeof(struct icmp6_hdr); 578 /* 579 * Adjust mbuf. ip6_plen will be adjusted in 580 * ip6_output(). 581 */ 582 m_adj(n0, off + sizeof(struct icmp6_hdr)); 583 /* recalculate complete packet size */ 584 n->m_pkthdr.len = n0len + (noff - off); 585 n->m_next = n0; 586 } else { 587 nip6 = mtod(n, struct ip6_hdr *); 588 nicmp6 = (struct icmp6_hdr *)((caddr_t)nip6 + off); 589 noff = off; 590 } 591 nicmp6->icmp6_type = ICMP6_ECHO_REPLY; 592 nicmp6->icmp6_code = 0; 593 if (n) { 594 icmp6stat.icp6s_reflect++; 595 icmp6stat.icp6s_outhist[ICMP6_ECHO_REPLY]++; 596 icmp6_reflect(n, noff); 597 } 598 break; 599 600 case ICMP6_ECHO_REPLY: 601 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echoreply); 602 if (code != 0) 603 goto badcode; 604 break; 605 606 case MLD_LISTENER_QUERY: 607 case MLD_LISTENER_REPORT: 608 if (icmp6len < sizeof(struct mld_hdr)) 609 goto badlen; 610 if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */ 611 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldquery); 612 else 613 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldreport); 614 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) { 615 /* give up local */ 616 mld6_input(m, off); 617 m = NULL; 618 goto freeit; 619 } 620 mld6_input(n, off); 621 /* m stays. */ 622 break; 623 624 case MLD_LISTENER_DONE: 625 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mlddone); 626 if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */ 627 goto badlen; 628 break; /* nothing to be done in kernel */ 629 630 case MLD_MTRACE_RESP: 631 case MLD_MTRACE: 632 /* XXX: these two are experimental. not officially defind. */ 633 /* XXX: per-interface statistics? */ 634 break; /* just pass it to applications */ 635 636 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */ 637 { 638 enum { WRU, FQDN } mode; 639 640 if (!icmp6_nodeinfo) 641 break; 642 643 if (icmp6len == sizeof(struct icmp6_hdr) + 4) 644 mode = WRU; 645 else if (icmp6len >= sizeof(struct icmp6_nodeinfo)) 646 mode = FQDN; 647 else 648 goto badlen; 649 650 #define hostnamelen strlen(hostname) 651 if (mode == FQDN) { 652 #ifndef PULLDOWN_TEST 653 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo), 654 IPPROTO_DONE); 655 #endif 656 n = m_copy(m, 0, M_COPYALL); 657 if (n) 658 n = ni6_input(n, off); 659 /* XXX meaningless if n == NULL */ 660 noff = sizeof(struct ip6_hdr); 661 } else { 662 u_char *p; 663 int maxlen, maxhlen; 664 665 if ((icmp6_nodeinfo & 5) != 5) 666 break; 667 668 if (code != 0) 669 goto badcode; 670 maxlen = sizeof(*nip6) + sizeof(*nicmp6) + 4; 671 if (maxlen >= MCLBYTES) { 672 /* Give up remote */ 673 break; 674 } 675 n = m_getb(maxlen, M_NOWAIT, m->m_type, M_PKTHDR); 676 if (n == NULL) { 677 /* Give up remote */ 678 break; 679 } 680 if (!m_dup_pkthdr(n, m, M_NOWAIT)) { 681 /* 682 * Previous code did a blind M_COPY_PKTHDR 683 * and said "just for rcvif". If true, then 684 * we could tolerate the dup failing (due to 685 * the deep copy of the tag chain). For now 686 * be conservative and just fail. 687 */ 688 m_free(n); 689 break; 690 } 691 n->m_len = 0; 692 maxhlen = M_TRAILINGSPACE(n) - maxlen; 693 if (maxhlen > hostnamelen) 694 maxhlen = hostnamelen; 695 /* 696 * Copy IPv6 and ICMPv6 only. 697 */ 698 nip6 = mtod(n, struct ip6_hdr *); 699 bcopy(ip6, nip6, sizeof(struct ip6_hdr)); 700 nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 701 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); 702 p = (u_char *)(nicmp6 + 1); 703 bzero(p, 4); 704 bcopy(hostname, p + 4, maxhlen); /* meaningless TTL */ 705 noff = sizeof(struct ip6_hdr); 706 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 707 sizeof(struct icmp6_hdr) + 4 + maxhlen; 708 nicmp6->icmp6_type = ICMP6_WRUREPLY; 709 nicmp6->icmp6_code = 0; 710 } 711 #undef hostnamelen 712 if (n) { 713 icmp6stat.icp6s_reflect++; 714 icmp6stat.icp6s_outhist[ICMP6_WRUREPLY]++; 715 icmp6_reflect(n, noff); 716 } 717 break; 718 } 719 720 case ICMP6_WRUREPLY: 721 if (code != 0) 722 goto badcode; 723 break; 724 725 case ND_ROUTER_SOLICIT: 726 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routersolicit); 727 if (code != 0) 728 goto badcode; 729 if (icmp6len < sizeof(struct nd_router_solicit)) 730 goto badlen; 731 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) { 732 /* give up local */ 733 nd6_rs_input(m, off, icmp6len); 734 m = NULL; 735 goto freeit; 736 } 737 nd6_rs_input(n, off, icmp6len); 738 /* m stays. */ 739 break; 740 741 case ND_ROUTER_ADVERT: 742 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routeradvert); 743 if (code != 0) 744 goto badcode; 745 if (icmp6len < sizeof(struct nd_router_advert)) 746 goto badlen; 747 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) { 748 /* give up local */ 749 nd6_ra_input(m, off, icmp6len); 750 m = NULL; 751 goto freeit; 752 } 753 nd6_ra_input(n, off, icmp6len); 754 /* m stays. */ 755 break; 756 757 case ND_NEIGHBOR_SOLICIT: 758 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighborsolicit); 759 if (code != 0) 760 goto badcode; 761 if (icmp6len < sizeof(struct nd_neighbor_solicit)) 762 goto badlen; 763 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) { 764 /* give up local */ 765 nd6_ns_input(m, off, icmp6len); 766 m = NULL; 767 goto freeit; 768 } 769 nd6_ns_input(n, off, icmp6len); 770 /* m stays. */ 771 break; 772 773 case ND_NEIGHBOR_ADVERT: 774 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighboradvert); 775 if (code != 0) 776 goto badcode; 777 if (icmp6len < sizeof(struct nd_neighbor_advert)) 778 goto badlen; 779 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) { 780 /* give up local */ 781 nd6_na_input(m, off, icmp6len); 782 m = NULL; 783 goto freeit; 784 } 785 nd6_na_input(n, off, icmp6len); 786 /* m stays. */ 787 break; 788 789 case ND_REDIRECT: 790 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_redirect); 791 if (code != 0) 792 goto badcode; 793 if (icmp6len < sizeof(struct nd_redirect)) 794 goto badlen; 795 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) { 796 /* give up local */ 797 icmp6_redirect_input(m, off); 798 m = NULL; 799 goto freeit; 800 } 801 icmp6_redirect_input(n, off); 802 /* m stays. */ 803 break; 804 805 case ICMP6_ROUTER_RENUMBERING: 806 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND && 807 code != ICMP6_ROUTER_RENUMBERING_RESULT) 808 goto badcode; 809 if (icmp6len < sizeof(struct icmp6_router_renum)) 810 goto badlen; 811 break; 812 813 default: 814 nd6log((LOG_DEBUG, 815 "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n", 816 icmp6->icmp6_type, ip6_sprintf(&ip6->ip6_src), 817 ip6_sprintf(&ip6->ip6_dst), 818 m->m_pkthdr.rcvif ? m->m_pkthdr.rcvif->if_index : 0)); 819 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) { 820 /* ICMPv6 error: MUST deliver it by spec... */ 821 code = PRC_NCMDS; 822 /* deliver */ 823 } else { 824 /* ICMPv6 informational: MUST not deliver */ 825 break; 826 } 827 deliver: 828 if (icmp6_notify_error(m, off, icmp6len, code)) { 829 /* In this case, m should've been freed. */ 830 return (IPPROTO_DONE); 831 } 832 break; 833 834 badcode: 835 icmp6stat.icp6s_badcode++; 836 break; 837 838 badlen: 839 icmp6stat.icp6s_badlen++; 840 break; 841 } 842 843 /* deliver the packet to appropriate sockets */ 844 icmp6_rip6_input(&m, *offp); 845 846 return IPPROTO_DONE; 847 848 freeit: 849 m_freem(m); 850 return IPPROTO_DONE; 851 } 852 853 static int 854 icmp6_notify_error(struct mbuf *m, int off, int icmp6len, int code) 855 { 856 struct icmp6_hdr *icmp6; 857 struct ip6_hdr *eip6; 858 u_int32_t notifymtu; 859 struct sockaddr_in6 icmp6src, icmp6dst; 860 861 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) { 862 icmp6stat.icp6s_tooshort++; 863 goto freeit; 864 } 865 #ifndef PULLDOWN_TEST 866 IP6_EXTHDR_CHECK(m, off, 867 sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr), 868 -1); 869 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 870 #else 871 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 872 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 873 if (icmp6 == NULL) { 874 icmp6stat.icp6s_tooshort++; 875 return (-1); 876 } 877 #endif 878 eip6 = (struct ip6_hdr *)(icmp6 + 1); 879 880 /* Detect the upper level protocol */ 881 { 882 u_int8_t nxt = eip6->ip6_nxt; 883 int eoff = off + sizeof(struct icmp6_hdr) + 884 sizeof(struct ip6_hdr); 885 struct ip6ctlparam ip6cp; 886 struct in6_addr *finaldst = NULL; 887 int icmp6type = icmp6->icmp6_type; 888 struct ip6_frag *fh; 889 struct ip6_rthdr *rth; 890 int rthlen; 891 892 while (1) { /* XXX: should avoid infinite loop explicitly? */ 893 struct ip6_ext *eh; 894 895 switch (nxt) { 896 case IPPROTO_HOPOPTS: 897 case IPPROTO_DSTOPTS: 898 case IPPROTO_AH: 899 #ifndef PULLDOWN_TEST 900 IP6_EXTHDR_CHECK(m, 0, eoff + 901 sizeof(struct ip6_ext), 902 -1); 903 eh = (struct ip6_ext *)(mtod(m, caddr_t) 904 + eoff); 905 #else 906 IP6_EXTHDR_GET(eh, struct ip6_ext *, m, 907 eoff, sizeof(*eh)); 908 if (eh == NULL) { 909 icmp6stat.icp6s_tooshort++; 910 return (-1); 911 } 912 #endif 913 914 if (nxt == IPPROTO_AH) 915 eoff += (eh->ip6e_len + 2) << 2; 916 else 917 eoff += (eh->ip6e_len + 1) << 3; 918 nxt = eh->ip6e_nxt; 919 break; 920 case IPPROTO_ROUTING: 921 /* 922 * When the erroneous packet contains a 923 * routing header, we should examine the 924 * header to determine the final destination. 925 * Otherwise, we can't properly update 926 * information that depends on the final 927 * destination (e.g. path MTU). 928 */ 929 #ifndef PULLDOWN_TEST 930 IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(*rth), 931 -1); 932 rth = (struct ip6_rthdr *)(mtod(m, caddr_t) 933 + eoff); 934 #else 935 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m, 936 eoff, sizeof(*rth)); 937 if (rth == NULL) { 938 icmp6stat.icp6s_tooshort++; 939 return (-1); 940 } 941 #endif 942 rthlen = (rth->ip6r_len + 1) << 3; 943 eoff += rthlen; 944 nxt = rth->ip6r_nxt; 945 break; 946 case IPPROTO_FRAGMENT: 947 #ifndef PULLDOWN_TEST 948 IP6_EXTHDR_CHECK(m, 0, eoff + 949 sizeof(struct ip6_frag), 950 -1); 951 fh = (struct ip6_frag *)(mtod(m, caddr_t) 952 + eoff); 953 #else 954 IP6_EXTHDR_GET(fh, struct ip6_frag *, m, 955 eoff, sizeof(*fh)); 956 if (fh == NULL) { 957 icmp6stat.icp6s_tooshort++; 958 return (-1); 959 } 960 #endif 961 /* 962 * Data after a fragment header is meaningless 963 * unless it is the first fragment, but 964 * we'll go to the notify label for path MTU 965 * discovery. 966 */ 967 if (fh->ip6f_offlg & IP6F_OFF_MASK) 968 goto notify; 969 970 eoff += sizeof(struct ip6_frag); 971 nxt = fh->ip6f_nxt; 972 break; 973 default: 974 /* 975 * This case includes ESP and the No Next 976 * Header. In such cases going to the notify 977 * label does not have any meaning 978 * (i.e. pr_ctlinput will be NULL), but we go 979 * anyway since we might have to update 980 * path MTU information. 981 */ 982 goto notify; 983 } 984 } 985 notify: 986 #ifndef PULLDOWN_TEST 987 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 988 #else 989 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 990 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 991 if (icmp6 == NULL) { 992 icmp6stat.icp6s_tooshort++; 993 return (-1); 994 } 995 #endif 996 997 eip6 = (struct ip6_hdr *)(icmp6 + 1); 998 bzero(&icmp6dst, sizeof(icmp6dst)); 999 icmp6dst.sin6_len = sizeof(struct sockaddr_in6); 1000 icmp6dst.sin6_family = AF_INET6; 1001 if (finaldst == NULL) 1002 icmp6dst.sin6_addr = eip6->ip6_dst; 1003 else 1004 icmp6dst.sin6_addr = *finaldst; 1005 icmp6dst.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif, 1006 &icmp6dst.sin6_addr); 1007 if (in6_embedscope(&icmp6dst.sin6_addr, &icmp6dst, 1008 NULL, NULL)) { 1009 /* should be impossbile */ 1010 nd6log((LOG_DEBUG, 1011 "icmp6_notify_error: in6_embedscope failed\n")); 1012 goto freeit; 1013 } 1014 1015 /* 1016 * retrieve parameters from the inner IPv6 header, and convert 1017 * them into sockaddr structures. 1018 */ 1019 bzero(&icmp6src, sizeof(icmp6src)); 1020 icmp6src.sin6_len = sizeof(struct sockaddr_in6); 1021 icmp6src.sin6_family = AF_INET6; 1022 icmp6src.sin6_addr = eip6->ip6_src; 1023 icmp6src.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif, 1024 &icmp6src.sin6_addr); 1025 if (in6_embedscope(&icmp6src.sin6_addr, &icmp6src, 1026 NULL, NULL)) { 1027 /* should be impossbile */ 1028 nd6log((LOG_DEBUG, 1029 "icmp6_notify_error: in6_embedscope failed\n")); 1030 goto freeit; 1031 } 1032 icmp6src.sin6_flowinfo = 1033 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK); 1034 1035 if (finaldst == NULL) 1036 finaldst = &eip6->ip6_dst; 1037 ip6cp.ip6c_m = m; 1038 ip6cp.ip6c_icmp6 = icmp6; 1039 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1); 1040 ip6cp.ip6c_off = eoff; 1041 ip6cp.ip6c_finaldst = finaldst; 1042 ip6cp.ip6c_src = &icmp6src; 1043 ip6cp.ip6c_nxt = nxt; 1044 1045 if (icmp6type == ICMP6_PACKET_TOO_BIG) { 1046 notifymtu = ntohl(icmp6->icmp6_mtu); 1047 ip6cp.ip6c_cmdarg = (void *)¬ifymtu; 1048 icmp6_mtudisc_update(&ip6cp, 1); /*XXX*/ 1049 } 1050 1051 so_pr_ctlinput( 1052 &inet6sw[ip6_protox[nxt]], 1053 code, (struct sockaddr *)&icmp6dst, &ip6cp); 1054 } 1055 return (0); 1056 1057 freeit: 1058 m_freem(m); 1059 return (-1); 1060 } 1061 1062 void 1063 icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated) 1064 { 1065 struct in6_addr *dst = ip6cp->ip6c_finaldst; 1066 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6; 1067 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */ 1068 u_int mtu = ntohl(icmp6->icmp6_mtu); 1069 struct rtentry *rt = NULL; 1070 struct sockaddr_in6 sin6; 1071 1072 if (!validated) 1073 return; 1074 1075 bzero(&sin6, sizeof(sin6)); 1076 sin6.sin6_family = PF_INET6; 1077 sin6.sin6_len = sizeof(struct sockaddr_in6); 1078 sin6.sin6_addr = *dst; 1079 /* XXX normally, this won't happen */ 1080 if (IN6_IS_ADDR_LINKLOCAL(dst)) { 1081 sin6.sin6_addr.s6_addr16[1] = 1082 htons(m->m_pkthdr.rcvif->if_index); 1083 } 1084 /* sin6.sin6_scope_id = XXX: should be set if DST is a scoped addr */ 1085 rt = rtpurelookup((struct sockaddr *)&sin6); 1086 if (rt != NULL && (rt->rt_flags & RTF_HOST) && 1087 !(rt->rt_rmx.rmx_locks & RTV_MTU)) { 1088 if (mtu < IPV6_MMTU) { /* XXX */ 1089 rt->rt_rmx.rmx_locks |= RTV_MTU; 1090 } else if (mtu < rt->rt_ifp->if_mtu && 1091 rt->rt_rmx.rmx_mtu > mtu) { 1092 icmp6stat.icp6s_pmtuchg++; 1093 rt->rt_rmx.rmx_mtu = mtu; 1094 } 1095 } 1096 if (rt) 1097 --rt->rt_refcnt; 1098 } 1099 1100 /* 1101 * Process a Node Information Query packet, based on 1102 * draft-ietf-ipngwg-icmp-name-lookups-07. 1103 * 1104 * Spec incompatibilities: 1105 * - IPv6 Subject address handling 1106 * - IPv4 Subject address handling support missing 1107 * - Proxy reply (answer even if it's not for me) 1108 * - joins NI group address at in6_ifattach() time only, does not cope 1109 * with hostname changes by sethostname(3) 1110 */ 1111 #define hostnamelen strlen(hostname) 1112 static struct mbuf * 1113 ni6_input(struct mbuf *m, int off) 1114 { 1115 struct icmp6_nodeinfo *ni6, *nni6; 1116 struct mbuf *n = NULL; 1117 u_int16_t qtype; 1118 int subjlen; 1119 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1120 struct ni_reply_fqdn *fqdn; 1121 int addrs; /* for NI_QTYPE_NODEADDR */ 1122 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */ 1123 struct sockaddr_in6 sin6; /* double meaning; ip6_dst and subjectaddr */ 1124 struct sockaddr_in6 sin6_d; /* XXX: we should retrieve this from m_aux */ 1125 struct ip6_hdr *ip6; 1126 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */ 1127 char *subj = NULL; 1128 struct in6_ifaddr *ia6 = NULL; 1129 1130 ip6 = mtod(m, struct ip6_hdr *); 1131 #ifndef PULLDOWN_TEST 1132 ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off); 1133 #else 1134 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6)); 1135 if (ni6 == NULL) { 1136 /* m is already reclaimed */ 1137 return NULL; 1138 } 1139 #endif 1140 1141 /* 1142 * Validate IPv6 destination address. 1143 * 1144 * The Responder must discard the Query without further processing 1145 * unless it is one of the Responder's unicast or anycast addresses, or 1146 * a link-local scope multicast address which the Responder has joined. 1147 * [icmp-name-lookups-07, Section 4.] 1148 */ 1149 bzero(&sin6, sizeof(sin6)); 1150 sin6.sin6_family = AF_INET6; 1151 sin6.sin6_len = sizeof(struct sockaddr_in6); 1152 bcopy(&ip6->ip6_dst, &sin6.sin6_addr, sizeof(sin6.sin6_addr)); 1153 /* XXX scopeid */ 1154 if ((ia6 = (struct in6_ifaddr *)ifa_ifwithaddr((struct sockaddr *)&sin6)) != NULL) { 1155 /* unicast/anycast, fine */ 1156 if ((ia6->ia6_flags & IN6_IFF_TEMPORARY) && 1157 (icmp6_nodeinfo & 4) == 0) { 1158 nd6log((LOG_DEBUG, "ni6_input: ignore node info to " 1159 "a temporary address in %s:%d", 1160 __FILE__, __LINE__)); 1161 goto bad; 1162 } 1163 } else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr)) 1164 ; /* link-local multicast, fine */ 1165 else 1166 goto bad; 1167 1168 /* validate query Subject field. */ 1169 qtype = ntohs(ni6->ni_qtype); 1170 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo); 1171 switch (qtype) { 1172 case NI_QTYPE_NOOP: 1173 case NI_QTYPE_SUPTYPES: 1174 /* 07 draft */ 1175 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0) 1176 break; 1177 /* FALLTHROUGH */ 1178 case NI_QTYPE_FQDN: 1179 case NI_QTYPE_NODEADDR: 1180 switch (ni6->ni_code) { 1181 case ICMP6_NI_SUBJ_IPV6: 1182 #if ICMP6_NI_SUBJ_IPV6 != 0 1183 case 0: 1184 #endif 1185 /* 1186 * backward compatibility - try to accept 03 draft 1187 * format, where no Subject is present. 1188 */ 1189 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 && 1190 subjlen == 0) { 1191 oldfqdn++; 1192 break; 1193 } 1194 #if ICMP6_NI_SUBJ_IPV6 != 0 1195 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6) 1196 goto bad; 1197 #endif 1198 1199 if (subjlen != sizeof(sin6.sin6_addr)) 1200 goto bad; 1201 1202 /* 1203 * Validate Subject address. 1204 * 1205 * Not sure what exactly "address belongs to the node" 1206 * means in the spec, is it just unicast, or what? 1207 * 1208 * At this moment we consider Subject address as 1209 * "belong to the node" if the Subject address equals 1210 * to the IPv6 destination address; validation for 1211 * IPv6 destination address should have done enough 1212 * check for us. 1213 * 1214 * We do not do proxy at this moment. 1215 */ 1216 /* m_pulldown instead of copy? */ 1217 m_copydata(m, off + sizeof(struct icmp6_nodeinfo), 1218 subjlen, (caddr_t)&sin6.sin6_addr); 1219 sin6.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif, 1220 &sin6.sin6_addr); 1221 in6_embedscope(&sin6.sin6_addr, &sin6, NULL, NULL); 1222 bzero(&sin6_d, sizeof(sin6_d)); 1223 sin6_d.sin6_family = AF_INET6; /* not used, actually */ 1224 sin6_d.sin6_len = sizeof(sin6_d); /* ditto */ 1225 sin6_d.sin6_addr = ip6->ip6_dst; 1226 sin6_d.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif, 1227 &ip6->ip6_dst); 1228 in6_embedscope(&sin6_d.sin6_addr, &sin6_d, NULL, NULL); 1229 subj = (char *)&sin6; 1230 if (SA6_ARE_ADDR_EQUAL(&sin6, &sin6_d)) 1231 break; 1232 1233 /* 1234 * XXX if we are to allow other cases, we should really 1235 * be careful about scope here. 1236 * basically, we should disallow queries toward IPv6 1237 * destination X with subject Y, if scope(X) > scope(Y). 1238 * if we allow scope(X) > scope(Y), it will result in 1239 * information leakage across scope boundary. 1240 */ 1241 goto bad; 1242 1243 case ICMP6_NI_SUBJ_FQDN: 1244 /* 1245 * Validate Subject name with gethostname(3). 1246 * 1247 * The behavior may need some debate, since: 1248 * - we are not sure if the node has FQDN as 1249 * hostname (returned by gethostname(3)). 1250 * - the code does wildcard match for truncated names. 1251 * however, we are not sure if we want to perform 1252 * wildcard match, if gethostname(3) side has 1253 * truncated hostname. 1254 */ 1255 n = ni6_nametodns(hostname, hostnamelen, 0); 1256 if (!n || n->m_next || n->m_len == 0) 1257 goto bad; 1258 IP6_EXTHDR_GET(subj, char *, m, 1259 off + sizeof(struct icmp6_nodeinfo), subjlen); 1260 if (subj == NULL) 1261 goto bad; 1262 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *), 1263 n->m_len)) { 1264 goto bad; 1265 } 1266 m_freem(n); 1267 n = NULL; 1268 break; 1269 1270 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */ 1271 default: 1272 goto bad; 1273 } 1274 break; 1275 } 1276 1277 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */ 1278 switch (qtype) { 1279 case NI_QTYPE_FQDN: 1280 if ((icmp6_nodeinfo & 1) == 0) 1281 goto bad; 1282 break; 1283 case NI_QTYPE_NODEADDR: 1284 if ((icmp6_nodeinfo & 2) == 0) 1285 goto bad; 1286 break; 1287 } 1288 1289 /* guess reply length */ 1290 switch (qtype) { 1291 case NI_QTYPE_NOOP: 1292 break; /* no reply data */ 1293 case NI_QTYPE_SUPTYPES: 1294 replylen += sizeof(u_int32_t); 1295 break; 1296 case NI_QTYPE_FQDN: 1297 /* XXX will append an mbuf */ 1298 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1299 break; 1300 case NI_QTYPE_NODEADDR: 1301 addrs = ni6_addrs(ni6, m, &ifp, subj); 1302 if ((replylen += addrs * (sizeof(struct in6_addr) + 1303 sizeof(u_int32_t))) > MCLBYTES) 1304 replylen = MCLBYTES; /* XXX: will truncate pkt later */ 1305 break; 1306 default: 1307 /* 1308 * XXX: We must return a reply with the ICMP6 code 1309 * `unknown Qtype' in this case. However we regard the case 1310 * as an FQDN query for backward compatibility. 1311 * Older versions set a random value to this field, 1312 * so it rarely varies in the defined qtypes. 1313 * But the mechanism is not reliable... 1314 * maybe we should obsolete older versions. 1315 */ 1316 qtype = NI_QTYPE_FQDN; 1317 /* XXX will append an mbuf */ 1318 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1319 oldfqdn++; 1320 break; 1321 } 1322 1323 /* allocate an mbuf to reply. */ 1324 if (replylen > MCLBYTES) { 1325 /* 1326 * XXX: should we try to allocate more? But MCLBYTES 1327 * is probably much larger than IPV6_MMTU... 1328 */ 1329 goto bad; 1330 } 1331 n = m_getb(replylen, M_NOWAIT, m->m_type, M_PKTHDR); 1332 if (n == NULL) { 1333 m_freem(m); 1334 return (NULL); 1335 } 1336 M_MOVE_PKTHDR(n, m); /* just for recvif */ 1337 n->m_pkthdr.len = n->m_len = replylen; 1338 1339 /* copy mbuf header and IPv6 + Node Information base headers */ 1340 bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr)); 1341 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1); 1342 bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo)); 1343 1344 /* qtype dependent procedure */ 1345 switch (qtype) { 1346 case NI_QTYPE_NOOP: 1347 nni6->ni_code = ICMP6_NI_SUCCESS; 1348 nni6->ni_flags = 0; 1349 break; 1350 case NI_QTYPE_SUPTYPES: 1351 { 1352 u_int32_t v; 1353 nni6->ni_code = ICMP6_NI_SUCCESS; 1354 nni6->ni_flags = htons(0x0000); /* raw bitmap */ 1355 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */ 1356 v = (u_int32_t)htonl(0x0000000f); 1357 bcopy(&v, nni6 + 1, sizeof(u_int32_t)); 1358 break; 1359 } 1360 case NI_QTYPE_FQDN: 1361 nni6->ni_code = ICMP6_NI_SUCCESS; 1362 fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) + 1363 sizeof(struct ip6_hdr) + 1364 sizeof(struct icmp6_nodeinfo)); 1365 nni6->ni_flags = 0; /* XXX: meaningless TTL */ 1366 fqdn->ni_fqdn_ttl = 0; /* ditto. */ 1367 /* 1368 * XXX do we really have FQDN in variable "hostname"? 1369 */ 1370 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn); 1371 if (n->m_next == NULL) 1372 goto bad; 1373 /* XXX we assume that n->m_next is not a chain */ 1374 if (n->m_next->m_next != NULL) 1375 goto bad; 1376 n->m_pkthdr.len += n->m_next->m_len; 1377 break; 1378 case NI_QTYPE_NODEADDR: 1379 { 1380 int lenlim, copied; 1381 1382 nni6->ni_code = ICMP6_NI_SUCCESS; 1383 n->m_pkthdr.len = n->m_len = 1384 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1385 lenlim = M_TRAILINGSPACE(n); 1386 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim); 1387 /* XXX: reset mbuf length */ 1388 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 1389 sizeof(struct icmp6_nodeinfo) + copied; 1390 break; 1391 } 1392 default: 1393 break; /* XXX impossible! */ 1394 } 1395 1396 nni6->ni_type = ICMP6_NI_REPLY; 1397 m_freem(m); 1398 return (n); 1399 1400 bad: 1401 m_freem(m); 1402 if (n) 1403 m_freem(n); 1404 return (NULL); 1405 } 1406 #undef hostnamelen 1407 1408 /* 1409 * make a mbuf with DNS-encoded string. no compression support. 1410 * 1411 * XXX names with less than 2 dots (like "foo" or "foo.section") will be 1412 * treated as truncated name (two \0 at the end). this is a wild guess. 1413 */ 1414 static struct mbuf * 1415 ni6_nametodns(const char *name, int namelen, 1416 int old) /* return pascal string if non-zero */ 1417 { 1418 struct mbuf *m; 1419 char *cp, *ep; 1420 const char *p, *q; 1421 int i, len, nterm; 1422 1423 if (old) 1424 len = namelen + 1; 1425 else 1426 len = MCLBYTES; 1427 1428 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */ 1429 m = m_getb(len, M_NOWAIT, MT_DATA, 0); 1430 if (!m) 1431 goto fail; 1432 1433 if (old) { 1434 m->m_len = len; 1435 *mtod(m, char *) = namelen; 1436 bcopy(name, mtod(m, char *) + 1, namelen); 1437 return m; 1438 } else { 1439 m->m_len = 0; 1440 cp = mtod(m, char *); 1441 ep = mtod(m, char *) + M_TRAILINGSPACE(m); 1442 1443 /* if not certain about my name, return empty buffer */ 1444 if (namelen == 0) 1445 return m; 1446 1447 /* 1448 * guess if it looks like shortened hostname, or FQDN. 1449 * shortened hostname needs two trailing "\0". 1450 */ 1451 i = 0; 1452 for (p = name; p < name + namelen; p++) { 1453 if (*p && *p == '.') 1454 i++; 1455 } 1456 if (i < 2) 1457 nterm = 2; 1458 else 1459 nterm = 1; 1460 1461 p = name; 1462 while (cp < ep && p < name + namelen) { 1463 i = 0; 1464 for (q = p; q < name + namelen && *q && *q != '.'; q++) 1465 i++; 1466 /* result does not fit into mbuf */ 1467 if (cp + i + 1 >= ep) 1468 goto fail; 1469 /* 1470 * DNS label length restriction, RFC1035 page 8. 1471 * "i == 0" case is included here to avoid returning 1472 * 0-length label on "foo..bar". 1473 */ 1474 if (i <= 0 || i >= 64) 1475 goto fail; 1476 *cp++ = i; 1477 bcopy(p, cp, i); 1478 cp += i; 1479 p = q; 1480 if (p < name + namelen && *p == '.') 1481 p++; 1482 } 1483 /* termination */ 1484 if (cp + nterm >= ep) 1485 goto fail; 1486 while (nterm-- > 0) 1487 *cp++ = '\0'; 1488 m->m_len = cp - mtod(m, char *); 1489 return m; 1490 } 1491 1492 panic("should not reach here"); 1493 /* NOTREACHED */ 1494 1495 fail: 1496 if (m) 1497 m_freem(m); 1498 return NULL; 1499 } 1500 1501 /* 1502 * check if two DNS-encoded string matches. takes care of truncated 1503 * form (with \0\0 at the end). no compression support. 1504 * XXX upper/lowercase match (see RFC2065) 1505 */ 1506 static int 1507 ni6_dnsmatch(const char *a, int alen, const char *b, int blen) 1508 { 1509 const char *a0, *b0; 1510 int l; 1511 1512 /* simplest case - need validation? */ 1513 if (alen == blen && bcmp(a, b, alen) == 0) 1514 return 1; 1515 1516 a0 = a; 1517 b0 = b; 1518 1519 /* termination is mandatory */ 1520 if (alen < 2 || blen < 2) 1521 return 0; 1522 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0') 1523 return 0; 1524 alen--; 1525 blen--; 1526 1527 while (a - a0 < alen && b - b0 < blen) { 1528 if (a - a0 + 1 > alen || b - b0 + 1 > blen) 1529 return 0; 1530 1531 if ((signed char)a[0] < 0 || (signed char)b[0] < 0) 1532 return 0; 1533 /* we don't support compression yet */ 1534 if (a[0] >= 64 || b[0] >= 64) 1535 return 0; 1536 1537 /* truncated case */ 1538 if (a[0] == 0 && a - a0 == alen - 1) 1539 return 1; 1540 if (b[0] == 0 && b - b0 == blen - 1) 1541 return 1; 1542 if (a[0] == 0 || b[0] == 0) 1543 return 0; 1544 1545 if (a[0] != b[0]) 1546 return 0; 1547 l = a[0]; 1548 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen) 1549 return 0; 1550 if (bcmp(a + 1, b + 1, l) != 0) 1551 return 0; 1552 1553 a += 1 + l; 1554 b += 1 + l; 1555 } 1556 1557 if (a - a0 == alen && b - b0 == blen) 1558 return 1; 1559 else 1560 return 0; 1561 } 1562 1563 /* 1564 * calculate the number of addresses to be returned in the node info reply. 1565 */ 1566 static int 1567 ni6_addrs(struct icmp6_nodeinfo *ni6, struct mbuf *m, struct ifnet **ifpp, 1568 char *subj) 1569 { 1570 const struct ifnet_array *arr; 1571 struct in6_ifaddr *ifa6; 1572 struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */ 1573 int addrs = 0, addrsofif, iffound = 0; 1574 int niflags = ni6->ni_flags; 1575 int i; 1576 1577 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) { 1578 switch (ni6->ni_code) { 1579 case ICMP6_NI_SUBJ_IPV6: 1580 if (subj == NULL) /* must be impossible... */ 1581 return (0); 1582 subj_ip6 = (struct sockaddr_in6 *)subj; 1583 break; 1584 default: 1585 /* 1586 * XXX: we only support IPv6 subject address for 1587 * this Qtype. 1588 */ 1589 return (0); 1590 } 1591 } 1592 1593 arr = ifnet_array_get(); 1594 for (i = 0; i < arr->ifnet_count; ++i) { 1595 struct ifnet *ifp = arr->ifnet_arr[i]; 1596 struct ifaddr_container *ifac; 1597 1598 addrsofif = 0; 1599 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) 1600 { 1601 struct ifaddr *ifa = ifac->ifa; 1602 1603 if (ifa->ifa_addr->sa_family != AF_INET6) 1604 continue; 1605 ifa6 = (struct in6_ifaddr *)ifa; 1606 1607 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 && 1608 IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr, 1609 &ifa6->ia_addr.sin6_addr)) 1610 iffound = 1; 1611 1612 /* 1613 * IPv4-mapped addresses can only be returned by a 1614 * Node Information proxy, since they represent 1615 * addresses of IPv4-only nodes, which perforce do 1616 * not implement this protocol. 1617 * [icmp-name-lookups-07, Section 5.4] 1618 * So we don't support NI_NODEADDR_FLAG_COMPAT in 1619 * this function at this moment. 1620 */ 1621 1622 /* What do we have to do about ::1? */ 1623 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) { 1624 case IPV6_ADDR_SCOPE_LINKLOCAL: 1625 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1626 continue; 1627 break; 1628 case IPV6_ADDR_SCOPE_SITELOCAL: 1629 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1630 continue; 1631 break; 1632 case IPV6_ADDR_SCOPE_GLOBAL: 1633 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1634 continue; 1635 break; 1636 default: 1637 continue; 1638 } 1639 1640 /* 1641 * check if anycast is okay. 1642 * XXX: just experimental. not in the spec. 1643 */ 1644 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) && 1645 !(niflags & NI_NODEADDR_FLAG_ANYCAST)) 1646 continue; /* we need only unicast addresses */ 1647 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) && 1648 (icmp6_nodeinfo & 4) == 0) { 1649 continue; 1650 } 1651 addrsofif++; /* count the address */ 1652 } 1653 if (iffound) { 1654 *ifpp = ifp; 1655 return (addrsofif); 1656 } 1657 1658 addrs += addrsofif; 1659 } 1660 1661 return (addrs); 1662 } 1663 1664 static int 1665 ni6_store_addrs(struct icmp6_nodeinfo *ni6, struct icmp6_nodeinfo *nni6, 1666 struct ifnet *ifp0, int resid) 1667 { 1668 const struct ifnet_array *arr; 1669 struct in6_ifaddr *ifa6; 1670 int copied = 0, allow_deprecated = 0; 1671 u_char *cp = (u_char *)(nni6 + 1); 1672 int niflags = ni6->ni_flags; 1673 u_int32_t ltime; 1674 int idx, idx_dep = -1; 1675 1676 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL)) 1677 return (0); /* needless to copy */ 1678 1679 arr = ifnet_array_get(); 1680 if (ifp0 == NULL) { 1681 idx = 0; 1682 } else { 1683 for (idx = 0; idx < arr->ifnet_count; ++idx) { 1684 if (arr->ifnet_arr[idx] == ifp0) 1685 break; 1686 } 1687 } 1688 1689 again: 1690 1691 for (; idx < arr->ifnet_count; ++idx) { 1692 struct ifnet *ifp = arr->ifnet_arr[idx]; 1693 struct ifaddr_container *ifac; 1694 1695 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1696 struct ifaddr *ifa = ifac->ifa; 1697 1698 if (ifa->ifa_addr->sa_family != AF_INET6) 1699 continue; 1700 ifa6 = (struct in6_ifaddr *)ifa; 1701 1702 if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) && 1703 allow_deprecated == 0) { 1704 /* 1705 * prefererred address should be put before 1706 * deprecated addresses. 1707 */ 1708 1709 /* record the interface for later search */ 1710 if (idx_dep < 0) 1711 idx_dep = idx; 1712 1713 continue; 1714 } 1715 else if (!(ifa6->ia6_flags & IN6_IFF_DEPRECATED) && 1716 allow_deprecated != 0) 1717 continue; /* we now collect deprecated addrs */ 1718 1719 /* What do we have to do about ::1? */ 1720 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) { 1721 case IPV6_ADDR_SCOPE_LINKLOCAL: 1722 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1723 continue; 1724 break; 1725 case IPV6_ADDR_SCOPE_SITELOCAL: 1726 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1727 continue; 1728 break; 1729 case IPV6_ADDR_SCOPE_GLOBAL: 1730 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1731 continue; 1732 break; 1733 default: 1734 continue; 1735 } 1736 1737 /* 1738 * check if anycast is okay. 1739 * XXX: just experimental. not in the spec. 1740 */ 1741 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) && 1742 !(niflags & NI_NODEADDR_FLAG_ANYCAST)) 1743 continue; 1744 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) && 1745 (icmp6_nodeinfo & 4) == 0) { 1746 continue; 1747 } 1748 1749 /* now we can copy the address */ 1750 if (resid < sizeof(struct in6_addr) + 1751 sizeof(u_int32_t)) { 1752 /* 1753 * We give up much more copy. 1754 * Set the truncate flag and return. 1755 */ 1756 nni6->ni_flags |= 1757 NI_NODEADDR_FLAG_TRUNCATE; 1758 return (copied); 1759 } 1760 1761 /* 1762 * Set the TTL of the address. 1763 * The TTL value should be one of the following 1764 * according to the specification: 1765 * 1766 * 1. The remaining lifetime of a DHCP lease on the 1767 * address, or 1768 * 2. The remaining Valid Lifetime of a prefix from 1769 * which the address was derived through Stateless 1770 * Autoconfiguration. 1771 * 1772 * Note that we currently do not support stateful 1773 * address configuration by DHCPv6, so the former 1774 * case can't happen. 1775 */ 1776 if (ifa6->ia6_lifetime.ia6t_expire == 0) 1777 ltime = ND6_INFINITE_LIFETIME; 1778 else { 1779 if (ifa6->ia6_lifetime.ia6t_expire > 1780 time_uptime) 1781 ltime = htonl(ifa6->ia6_lifetime.ia6t_expire - time_uptime); 1782 else 1783 ltime = 0; 1784 } 1785 1786 bcopy(<ime, cp, sizeof(u_int32_t)); 1787 cp += sizeof(u_int32_t); 1788 1789 /* copy the address itself */ 1790 bcopy(&ifa6->ia_addr.sin6_addr, cp, 1791 sizeof(struct in6_addr)); 1792 /* XXX: KAME link-local hack; remove ifindex */ 1793 if (IN6_IS_ADDR_LINKLOCAL(&ifa6->ia_addr.sin6_addr)) 1794 ((struct in6_addr *)cp)->s6_addr16[1] = 0; 1795 cp += sizeof(struct in6_addr); 1796 1797 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1798 copied += (sizeof(struct in6_addr) + 1799 sizeof(u_int32_t)); 1800 } 1801 if (ifp0) /* we need search only on the specified IF */ 1802 break; 1803 } 1804 1805 if (allow_deprecated == 0 && idx_dep >= 0) { 1806 idx = idx_dep; 1807 allow_deprecated = 1; 1808 1809 goto again; 1810 } 1811 1812 return (copied); 1813 } 1814 1815 /* 1816 * XXX almost dup'ed code with rip6_input. 1817 */ 1818 static int 1819 icmp6_rip6_input(struct mbuf **mp, int off) 1820 { 1821 struct mbuf *m = *mp; 1822 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1823 struct in6pcb *in6p; 1824 struct in6pcb *last = NULL; 1825 struct sockaddr_in6 rip6src; 1826 struct icmp6_hdr *icmp6; 1827 struct mbuf *opts = NULL; 1828 1829 #ifndef PULLDOWN_TEST 1830 /* this is assumed to be safe. */ 1831 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off); 1832 #else 1833 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 1834 if (icmp6 == NULL) { 1835 /* m is already reclaimed */ 1836 return IPPROTO_DONE; 1837 } 1838 #endif 1839 1840 bzero(&rip6src, sizeof(rip6src)); 1841 rip6src.sin6_len = sizeof(struct sockaddr_in6); 1842 rip6src.sin6_family = AF_INET6; 1843 /* KAME hack: recover scopeid */ 1844 in6_recoverscope(&rip6src, &ip6->ip6_src, m->m_pkthdr.rcvif); 1845 1846 LIST_FOREACH(in6p, &ripcbinfo.pcblisthead, inp_list) 1847 { 1848 if (in6p->inp_flags & INP_PLACEMARKER) 1849 continue; 1850 if (!INP_ISIPV6(in6p)) 1851 continue; 1852 if (in6p->in6p_ip6_nxt != IPPROTO_ICMPV6) 1853 continue; 1854 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && 1855 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst)) 1856 continue; 1857 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) && 1858 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src)) 1859 continue; 1860 if (in6p->in6p_icmp6filt 1861 && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type, 1862 in6p->in6p_icmp6filt)) 1863 continue; 1864 if (last) { 1865 struct socket *so; 1866 struct mbuf *n; 1867 1868 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { 1869 if (last->in6p_flags & IN6P_CONTROLOPTS) 1870 ip6_savecontrol(last, &opts, ip6, n); 1871 /* strip intermediate headers */ 1872 m_adj(n, off); 1873 so = last->in6p_socket; 1874 lwkt_gettoken(&so->so_rcv.ssb_token); 1875 if (ssb_appendaddr(&so->so_rcv, 1876 (struct sockaddr *)&rip6src, 1877 n, opts) == 0) { 1878 /* should notify about lost packet */ 1879 m_freem(n); 1880 if (opts) 1881 m_freem(opts); 1882 } else { 1883 sorwakeup(so); 1884 } 1885 lwkt_reltoken(&so->so_rcv.ssb_token); 1886 opts = NULL; 1887 } 1888 } 1889 last = in6p; 1890 } 1891 if (last) { 1892 struct socket *so; 1893 1894 if (last->in6p_flags & IN6P_CONTROLOPTS) 1895 ip6_savecontrol(last, &opts, ip6, m); 1896 /* strip intermediate headers */ 1897 m_adj(m, off); 1898 so = last->in6p_socket; 1899 lwkt_gettoken(&so->so_rcv.ssb_token); 1900 if (ssb_appendaddr(&so->so_rcv, (struct sockaddr *)&rip6src, 1901 m, opts) == 0) { 1902 m_freem(m); 1903 if (opts) 1904 m_freem(opts); 1905 } else { 1906 sorwakeup(so); 1907 } 1908 lwkt_reltoken(&so->so_rcv.ssb_token); 1909 } else { 1910 m_freem(m); 1911 ip6stat.ip6s_delivered--; 1912 } 1913 return IPPROTO_DONE; 1914 } 1915 1916 /* 1917 * Reflect the ip6 packet back to the source. 1918 * OFF points to the icmp6 header, counted from the top of the mbuf. 1919 */ 1920 void 1921 icmp6_reflect(struct mbuf *m, size_t off) 1922 { 1923 struct ip6_hdr *ip6; 1924 struct icmp6_hdr *icmp6; 1925 struct in6_ifaddr *ia; 1926 struct in6_addr t, *src = NULL; 1927 int plen; 1928 int type, code; 1929 struct ifnet *outif = NULL; 1930 struct sockaddr_in6 sa6_src, sa6_dst; 1931 #ifdef COMPAT_RFC1885 1932 int mtu = IPV6_MMTU; 1933 struct sockaddr_in6 *sin6 = &icmp6_reflect_rt.ro_dst; 1934 #endif 1935 1936 /* too short to reflect */ 1937 if (off < sizeof(struct ip6_hdr)) { 1938 nd6log((LOG_DEBUG, 1939 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n", 1940 (u_long)off, (u_long)sizeof(struct ip6_hdr), 1941 __FILE__, __LINE__)); 1942 goto bad; 1943 } 1944 1945 /* 1946 * If there are extra headers between IPv6 and ICMPv6, strip 1947 * off that header first. 1948 */ 1949 #ifdef DIAGNOSTIC 1950 if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN) 1951 panic("assumption failed in icmp6_reflect"); 1952 #endif 1953 if (off > sizeof(struct ip6_hdr)) { 1954 size_t l; 1955 struct ip6_hdr nip6; 1956 1957 l = off - sizeof(struct ip6_hdr); 1958 m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6); 1959 m_adj(m, l); 1960 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 1961 if (m->m_len < l) { 1962 if ((m = m_pullup(m, l)) == NULL) 1963 return; 1964 } 1965 bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6)); 1966 } else /* off == sizeof(struct ip6_hdr) */ { 1967 size_t l; 1968 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 1969 if (m->m_len < l) { 1970 if ((m = m_pullup(m, l)) == NULL) 1971 return; 1972 } 1973 } 1974 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr); 1975 ip6 = mtod(m, struct ip6_hdr *); 1976 ip6->ip6_nxt = IPPROTO_ICMPV6; 1977 icmp6 = (struct icmp6_hdr *)(ip6 + 1); 1978 type = icmp6->icmp6_type; /* keep type for statistics */ 1979 code = icmp6->icmp6_code; /* ditto. */ 1980 1981 t = ip6->ip6_dst; 1982 /* 1983 * ip6_input() drops a packet if its src is multicast. 1984 * So, the src is never multicast. 1985 */ 1986 ip6->ip6_dst = ip6->ip6_src; 1987 1988 /* 1989 * XXX: make sure to embed scope zone information, using 1990 * already embedded IDs or the received interface (if any). 1991 * Note that rcvif may be NULL. 1992 * TODO: scoped routing case (XXX). 1993 */ 1994 bzero(&sa6_src, sizeof(sa6_src)); 1995 sa6_src.sin6_family = AF_INET6; 1996 sa6_src.sin6_len = sizeof(sa6_src); 1997 sa6_src.sin6_addr = ip6->ip6_dst; 1998 in6_recoverscope(&sa6_src, &ip6->ip6_dst, m->m_pkthdr.rcvif); 1999 in6_embedscope(&ip6->ip6_dst, &sa6_src, NULL, NULL); 2000 bzero(&sa6_dst, sizeof(sa6_dst)); 2001 sa6_dst.sin6_family = AF_INET6; 2002 sa6_dst.sin6_len = sizeof(sa6_dst); 2003 sa6_dst.sin6_addr = t; 2004 in6_recoverscope(&sa6_dst, &t, m->m_pkthdr.rcvif); 2005 in6_embedscope(&t, &sa6_dst, NULL, NULL); 2006 2007 #ifdef COMPAT_RFC1885 2008 /* 2009 * xxx guess MTU 2010 * RFC 1885 requires that echo reply should be truncated if it 2011 * does not fit in with (return) path MTU, but the description was 2012 * removed in the new spec. 2013 */ 2014 if (icmp6_reflect_rt.ro_rt == 0 || 2015 ! (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &ip6->ip6_dst))) { 2016 if (icmp6_reflect_rt.ro_rt) { 2017 RTFREE(icmp6_reflect_rt.ro_rt); 2018 icmp6_reflect_rt.ro_rt = 0; 2019 } 2020 bzero(sin6, sizeof(*sin6)); 2021 sin6->sin6_family = PF_INET6; 2022 sin6->sin6_len = sizeof(struct sockaddr_in6); 2023 sin6->sin6_addr = ip6->ip6_dst; 2024 2025 rtalloc_ign((struct route *)&icmp6_reflect_rt.ro_rt, 2026 RTF_PRCLONING); 2027 } 2028 2029 if (icmp6_reflect_rt.ro_rt == 0) 2030 goto bad; 2031 2032 if ((icmp6_reflect_rt.ro_rt->rt_flags & RTF_HOST) 2033 && mtu < icmp6_reflect_rt.ro_rt->rt_ifp->if_mtu) 2034 mtu = icmp6_reflect_rt.ro_rt->rt_rmx.rmx_mtu; 2035 2036 if (mtu < m->m_pkthdr.len) { 2037 plen -= (m->m_pkthdr.len - mtu); 2038 m_adj(m, mtu - m->m_pkthdr.len); 2039 } 2040 #endif 2041 /* 2042 * If the incoming packet was addressed directly to us(i.e. unicast), 2043 * use dst as the src for the reply. 2044 * The IN6_IFF_NOTREADY case would be VERY rare, but is possible 2045 * (for example) when we encounter an error while forwarding procedure 2046 * destined to a duplicated address of ours. 2047 */ 2048 for (ia = in6_ifaddr; ia; ia = ia->ia_next) 2049 if (IN6_ARE_ADDR_EQUAL(&t, &ia->ia_addr.sin6_addr) && 2050 (ia->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) { 2051 src = &t; 2052 break; 2053 } 2054 if (ia == NULL && IN6_IS_ADDR_LINKLOCAL(&t) && (m->m_flags & M_LOOP)) { 2055 /* 2056 * This is the case if the dst is our link-local address 2057 * and the sender is also ourselves. 2058 */ 2059 src = &t; 2060 } 2061 2062 if (src == NULL) { 2063 int e; 2064 struct route_in6 ro; 2065 2066 /* 2067 * This case matches to multicasts, our anycast, or unicasts 2068 * that we do not own. Select a source address based on the 2069 * source address of the erroneous packet. 2070 */ 2071 bzero(&ro, sizeof(ro)); 2072 src = in6_selectsrc(&sa6_src, NULL, NULL, &ro, NULL, &e, NULL); 2073 if (ro.ro_rt) 2074 RTFREE(ro.ro_rt); /* XXX: we could use this */ 2075 if (src == NULL) { 2076 nd6log((LOG_DEBUG, 2077 "icmp6_reflect: source can't be determined: " 2078 "dst=%s, error=%d\n", 2079 ip6_sprintf(&sa6_src.sin6_addr), e)); 2080 goto bad; 2081 } 2082 } 2083 2084 ip6->ip6_src = *src; 2085 2086 ip6->ip6_flow = 0; 2087 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2088 ip6->ip6_vfc |= IPV6_VERSION; 2089 ip6->ip6_nxt = IPPROTO_ICMPV6; 2090 if (m->m_pkthdr.rcvif) { 2091 /* XXX: This may not be the outgoing interface */ 2092 ip6->ip6_hlim = ND_IFINFO(m->m_pkthdr.rcvif)->chlim; 2093 if (ip6->ip6_hlim < ip6_minhlim) 2094 ip6->ip6_hlim = ip6_minhlim; 2095 } else { 2096 ip6->ip6_hlim = ip6_defhlim; 2097 } 2098 2099 icmp6->icmp6_cksum = 0; 2100 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6, 2101 sizeof(struct ip6_hdr), plen); 2102 2103 /* 2104 * XXX option handling 2105 */ 2106 2107 m->m_flags &= ~(M_BCAST|M_MCAST); 2108 2109 #ifdef COMPAT_RFC1885 2110 ip6_output(m, NULL, &icmp6_reflect_rt, 0, NULL, &outif, NULL); 2111 #else 2112 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL); 2113 #endif 2114 if (outif) 2115 icmp6_ifoutstat_inc(outif, type, code); 2116 2117 return; 2118 2119 bad: 2120 m_freem(m); 2121 return; 2122 } 2123 2124 void 2125 icmp6_fasttimo(void) 2126 { 2127 2128 mld6_fasttimeo(); 2129 } 2130 2131 static const char * 2132 icmp6_redirect_diag(struct in6_addr *src6, struct in6_addr *dst6, 2133 struct in6_addr *tgt6) 2134 { 2135 static char buf[1024]; 2136 ksnprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)", 2137 ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6)); 2138 return buf; 2139 } 2140 2141 void 2142 icmp6_redirect_input(struct mbuf *m, int off) 2143 { 2144 struct ifnet *ifp = m->m_pkthdr.rcvif; 2145 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 2146 struct nd_redirect *nd_rd; 2147 int icmp6len = ntohs(ip6->ip6_plen); 2148 char *lladdr = NULL; 2149 int lladdrlen = 0; 2150 #if 0 2151 u_char *redirhdr = NULL; 2152 int redirhdrlen = 0; 2153 #endif 2154 struct rtentry *rt = NULL; 2155 int is_router; 2156 int is_onlink; 2157 struct in6_addr src6 = ip6->ip6_src; 2158 struct in6_addr redtgt6; 2159 struct in6_addr reddst6; 2160 union nd_opts ndopts; 2161 2162 if (!m || !ifp) 2163 return; 2164 2165 /* XXX if we are router, we don't update route by icmp6 redirect */ 2166 if (ip6_forwarding) 2167 goto freeit; 2168 if (!icmp6_rediraccept) 2169 goto freeit; 2170 2171 #ifndef PULLDOWN_TEST 2172 IP6_EXTHDR_CHECK(m, off, icmp6len,); 2173 nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off); 2174 #else 2175 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len); 2176 if (nd_rd == NULL) { 2177 icmp6stat.icp6s_tooshort++; 2178 return; 2179 } 2180 #endif 2181 redtgt6 = nd_rd->nd_rd_target; 2182 reddst6 = nd_rd->nd_rd_dst; 2183 2184 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 2185 redtgt6.s6_addr16[1] = htons(ifp->if_index); 2186 if (IN6_IS_ADDR_LINKLOCAL(&reddst6)) 2187 reddst6.s6_addr16[1] = htons(ifp->if_index); 2188 2189 /* validation */ 2190 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) { 2191 nd6log((LOG_ERR, 2192 "ICMP6 redirect sent from %s rejected; " 2193 "must be from linklocal\n", ip6_sprintf(&src6))); 2194 goto bad; 2195 } 2196 if (ip6->ip6_hlim != 255) { 2197 nd6log((LOG_ERR, 2198 "ICMP6 redirect sent from %s rejected; " 2199 "hlim=%d (must be 255)\n", 2200 ip6_sprintf(&src6), ip6->ip6_hlim)); 2201 goto bad; 2202 } 2203 { 2204 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */ 2205 struct sockaddr_in6 sin6; 2206 struct in6_addr *gw6; 2207 2208 bzero(&sin6, sizeof(sin6)); 2209 sin6.sin6_family = AF_INET6; 2210 sin6.sin6_len = sizeof(struct sockaddr_in6); 2211 bcopy(&reddst6, &sin6.sin6_addr, sizeof reddst6); 2212 rt = rtpurelookup((struct sockaddr *)&sin6); 2213 if (rt != NULL) { 2214 if (rt->rt_gateway == NULL || 2215 rt->rt_gateway->sa_family != AF_INET6) { 2216 nd6log((LOG_ERR, 2217 "ICMP6 redirect rejected; no route " 2218 "with inet6 gateway found for redirect dst: %s\n", 2219 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2220 --rt->rt_refcnt; 2221 goto bad; 2222 } 2223 2224 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr); 2225 if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) { 2226 nd6log((LOG_ERR, 2227 "ICMP6 redirect rejected; " 2228 "not equal to gw-for-src=%s (must be same): " 2229 "%s\n", 2230 ip6_sprintf(gw6), 2231 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2232 --rt->rt_refcnt; 2233 goto bad; 2234 } 2235 } else { 2236 nd6log((LOG_ERR, 2237 "ICMP6 redirect rejected; " 2238 "no route found for redirect dst: %s\n", 2239 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2240 goto bad; 2241 } 2242 --rt->rt_refcnt; 2243 rt = NULL; 2244 } 2245 if (IN6_IS_ADDR_MULTICAST(&reddst6)) { 2246 nd6log((LOG_ERR, 2247 "ICMP6 redirect rejected; " 2248 "redirect dst must be unicast: %s\n", 2249 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2250 goto bad; 2251 } 2252 2253 is_router = is_onlink = 0; 2254 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 2255 is_router = 1; /* router case */ 2256 if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0) 2257 is_onlink = 1; /* on-link destination case */ 2258 if (!is_router && !is_onlink) { 2259 nd6log((LOG_ERR, 2260 "ICMP6 redirect rejected; " 2261 "neither router case nor onlink case: %s\n", 2262 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2263 goto bad; 2264 } 2265 /* validation passed */ 2266 2267 icmp6len -= sizeof(*nd_rd); 2268 nd6_option_init(nd_rd + 1, icmp6len, &ndopts); 2269 if (nd6_options(&ndopts) < 0) { 2270 nd6log((LOG_INFO, "icmp6_redirect_input: " 2271 "invalid ND option, rejected: %s\n", 2272 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2273 /* nd6_options have incremented stats */ 2274 goto freeit; 2275 } 2276 2277 if (ndopts.nd_opts_tgt_lladdr) { 2278 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 2279 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 2280 } 2281 2282 #if 0 2283 if (ndopts.nd_opts_rh) { 2284 redirhdrlen = ndopts.nd_opts_rh->nd_opt_rh_len; 2285 redirhdr = (u_char *)(ndopts.nd_opts_rh + 1); /* xxx */ 2286 } 2287 #endif 2288 2289 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 2290 nd6log((LOG_INFO, 2291 "icmp6_redirect_input: lladdrlen mismatch for %s " 2292 "(if %d, icmp6 packet %d): %s\n", 2293 ip6_sprintf(&redtgt6), ifp->if_addrlen, lladdrlen - 2, 2294 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2295 goto bad; 2296 } 2297 2298 /* RFC 2461 8.3 */ 2299 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT, 2300 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER); 2301 2302 if (!is_onlink) { /* better router case. perform rtredirect. */ 2303 /* perform rtredirect */ 2304 struct sockaddr_in6 sdst; 2305 struct sockaddr_in6 sgw; 2306 struct sockaddr_in6 ssrc; 2307 2308 bzero(&sdst, sizeof(sdst)); 2309 bzero(&sgw, sizeof(sgw)); 2310 bzero(&ssrc, sizeof(ssrc)); 2311 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6; 2312 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len = 2313 sizeof(struct sockaddr_in6); 2314 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr)); 2315 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2316 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr)); 2317 rtredirect((struct sockaddr *)&sdst, (struct sockaddr *)&sgw, 2318 NULL, RTF_GATEWAY | RTF_HOST, 2319 (struct sockaddr *)&ssrc); 2320 } 2321 /* finally update cached route in each socket via kpfctlinput */ 2322 { 2323 struct sockaddr_in6 sdst; 2324 2325 bzero(&sdst, sizeof(sdst)); 2326 sdst.sin6_family = AF_INET6; 2327 sdst.sin6_len = sizeof(struct sockaddr_in6); 2328 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2329 kpfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst); 2330 #ifdef IPSEC 2331 key_sa_routechange((struct sockaddr *)&sdst); 2332 #endif 2333 } 2334 2335 freeit: 2336 m_freem(m); 2337 return; 2338 2339 bad: 2340 icmp6stat.icp6s_badredirect++; 2341 m_freem(m); 2342 } 2343 2344 void 2345 icmp6_redirect_output(struct mbuf *m0, struct rtentry *rt) 2346 { 2347 struct ifnet *ifp; /* my outgoing interface */ 2348 struct in6_addr *ifp_ll6; 2349 struct in6_addr *router_ll6; 2350 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */ 2351 struct mbuf *m = NULL; /* newly allocated one */ 2352 struct ip6_hdr *ip6; /* m as struct ip6_hdr */ 2353 struct nd_redirect *nd_rd; 2354 size_t maxlen; 2355 u_char *p; 2356 struct ifnet *outif = NULL; 2357 struct sockaddr_in6 src_sa; 2358 2359 icmp6_errcount(&icmp6stat.icp6s_outerrhist, ND_REDIRECT, 0); 2360 2361 /* if we are not router, we don't send icmp6 redirect */ 2362 if (!ip6_forwarding || ip6_accept_rtadv) 2363 goto fail; 2364 2365 /* sanity check */ 2366 if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp)) 2367 goto fail; 2368 2369 /* 2370 * Address check: 2371 * the source address must identify a neighbor, and 2372 * the destination address must not be a multicast address 2373 * [RFC 2461, sec 8.2] 2374 */ 2375 sip6 = mtod(m0, struct ip6_hdr *); 2376 bzero(&src_sa, sizeof(src_sa)); 2377 src_sa.sin6_family = AF_INET6; 2378 src_sa.sin6_len = sizeof(src_sa); 2379 src_sa.sin6_addr = sip6->ip6_src; 2380 /* we don't currently use sin6_scope_id, but eventually use it */ 2381 src_sa.sin6_scope_id = in6_addr2scopeid(ifp, &sip6->ip6_src); 2382 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0) 2383 goto fail; 2384 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst)) 2385 goto fail; /* what should we do here? */ 2386 2387 /* rate limit */ 2388 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0)) 2389 goto fail; 2390 2391 /* 2392 * Since we are going to append up to 1280 bytes (= IPV6_MMTU), 2393 * we almost always ask for an mbuf cluster for simplicity. 2394 * (MHLEN < IPV6_MMTU is almost always true) 2395 */ 2396 #if IPV6_MMTU >= MCLBYTES 2397 # error assumption failed about IPV6_MMTU and MCLBYTES 2398 #endif 2399 m = m_getb(IPV6_MMTU, M_NOWAIT, MT_HEADER, M_PKTHDR); 2400 if (!m) 2401 goto fail; 2402 m->m_len = 0; 2403 maxlen = M_TRAILINGSPACE(m); 2404 maxlen = min(IPV6_MMTU, maxlen); 2405 /* just for safety */ 2406 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) + 2407 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) { 2408 goto fail; 2409 } 2410 2411 { 2412 /* get ip6 linklocal address for ifp(my outgoing interface). */ 2413 struct in6_ifaddr *ia; 2414 if ((ia = in6ifa_ifpforlinklocal(ifp, 2415 IN6_IFF_NOTREADY| 2416 IN6_IFF_ANYCAST)) == NULL) 2417 goto fail; 2418 ifp_ll6 = &ia->ia_addr.sin6_addr; 2419 } 2420 2421 /* get ip6 linklocal address for the router. */ 2422 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) { 2423 struct sockaddr_in6 *sin6; 2424 sin6 = (struct sockaddr_in6 *)rt->rt_gateway; 2425 router_ll6 = &sin6->sin6_addr; 2426 if (!IN6_IS_ADDR_LINKLOCAL(router_ll6)) 2427 router_ll6 = NULL; 2428 } else 2429 router_ll6 = NULL; 2430 2431 /* ip6 */ 2432 ip6 = mtod(m, struct ip6_hdr *); 2433 ip6->ip6_flow = 0; 2434 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2435 ip6->ip6_vfc |= IPV6_VERSION; 2436 /* ip6->ip6_plen will be set later */ 2437 ip6->ip6_nxt = IPPROTO_ICMPV6; 2438 ip6->ip6_hlim = 255; 2439 /* ip6->ip6_src must be linklocal addr for my outgoing if. */ 2440 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr)); 2441 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr)); 2442 2443 /* ND Redirect */ 2444 nd_rd = (struct nd_redirect *)(ip6 + 1); 2445 nd_rd->nd_rd_type = ND_REDIRECT; 2446 nd_rd->nd_rd_code = 0; 2447 nd_rd->nd_rd_reserved = 0; 2448 if (rt->rt_flags & RTF_GATEWAY) { 2449 /* 2450 * nd_rd->nd_rd_target must be a link-local address in 2451 * better router cases. 2452 */ 2453 if (!router_ll6) 2454 goto fail; 2455 bcopy(router_ll6, &nd_rd->nd_rd_target, 2456 sizeof(nd_rd->nd_rd_target)); 2457 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2458 sizeof(nd_rd->nd_rd_dst)); 2459 } else { 2460 /* make sure redtgt == reddst */ 2461 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target, 2462 sizeof(nd_rd->nd_rd_target)); 2463 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2464 sizeof(nd_rd->nd_rd_dst)); 2465 } 2466 2467 p = (u_char *)(nd_rd + 1); 2468 2469 if (!router_ll6) 2470 goto nolladdropt; 2471 2472 { 2473 /* target lladdr option */ 2474 struct rtentry *rt_router = NULL; 2475 int len; 2476 struct sockaddr_dl *sdl; 2477 struct nd_opt_hdr *nd_opt; 2478 char *lladdr; 2479 2480 rt_router = nd6_lookup(router_ll6, 0, ifp); 2481 if (!rt_router) 2482 goto nolladdropt; 2483 len = sizeof(*nd_opt) + ifp->if_addrlen; 2484 len = (len + 7) & ~7; /* round by 8 */ 2485 /* safety check */ 2486 if (len + (p - (u_char *)ip6) > maxlen) 2487 goto nolladdropt; 2488 if (!(rt_router->rt_flags & RTF_GATEWAY) && 2489 (rt_router->rt_flags & RTF_LLINFO) && 2490 (rt_router->rt_gateway->sa_family == AF_LINK) && 2491 (sdl = (struct sockaddr_dl *)rt_router->rt_gateway) && 2492 sdl->sdl_alen) { 2493 nd_opt = (struct nd_opt_hdr *)p; 2494 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 2495 nd_opt->nd_opt_len = len >> 3; 2496 lladdr = (char *)(nd_opt + 1); 2497 bcopy(LLADDR(sdl), lladdr, ifp->if_addrlen); 2498 p += len; 2499 } 2500 } 2501 nolladdropt:; 2502 2503 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2504 2505 /* just to be safe */ 2506 #ifdef M_DECRYPTED /*not openbsd*/ 2507 if (m0->m_flags & M_DECRYPTED) 2508 goto noredhdropt; 2509 #endif 2510 if (p - (u_char *)ip6 > maxlen) 2511 goto noredhdropt; 2512 2513 { 2514 /* redirected header option */ 2515 int len; 2516 struct nd_opt_rd_hdr *nd_opt_rh; 2517 2518 /* 2519 * compute the maximum size for icmp6 redirect header option. 2520 * XXX room for auth header? 2521 */ 2522 len = maxlen - (p - (u_char *)ip6); 2523 len &= ~7; 2524 2525 /* This is just for simplicity. */ 2526 if (m0->m_pkthdr.len != m0->m_len) { 2527 if (m0->m_next) { 2528 m_freem(m0->m_next); 2529 m0->m_next = NULL; 2530 } 2531 m0->m_pkthdr.len = m0->m_len; 2532 } 2533 2534 /* 2535 * Redirected header option spec (RFC2461 4.6.3) talks nothing 2536 * about padding/truncate rule for the original IP packet. 2537 * From the discussion on IPv6imp in Feb 1999, the consensus was: 2538 * - "attach as much as possible" is the goal 2539 * - pad if not aligned (original size can be guessed by original 2540 * ip6 header) 2541 * Following code adds the padding if it is simple enough, 2542 * and truncates if not. 2543 */ 2544 if (m0->m_next || m0->m_pkthdr.len != m0->m_len) 2545 panic("assumption failed in %s:%d", __FILE__, __LINE__); 2546 2547 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) { 2548 /* not enough room, truncate */ 2549 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh); 2550 } else { 2551 /* enough room, pad or truncate */ 2552 size_t extra; 2553 2554 extra = m0->m_pkthdr.len % 8; 2555 if (extra) { 2556 /* pad if easy enough, truncate if not */ 2557 if (8 - extra <= M_TRAILINGSPACE(m0)) { 2558 /* pad */ 2559 m0->m_len += (8 - extra); 2560 m0->m_pkthdr.len += (8 - extra); 2561 } else { 2562 /* truncate */ 2563 m0->m_pkthdr.len -= extra; 2564 m0->m_len -= extra; 2565 } 2566 } 2567 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh); 2568 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh); 2569 } 2570 2571 nd_opt_rh = (struct nd_opt_rd_hdr *)p; 2572 bzero(nd_opt_rh, sizeof(*nd_opt_rh)); 2573 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER; 2574 nd_opt_rh->nd_opt_rh_len = len >> 3; 2575 p += sizeof(*nd_opt_rh); 2576 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2577 2578 /* connect m0 to m */ 2579 m->m_next = m0; 2580 m->m_pkthdr.len = m->m_len + m0->m_len; 2581 } 2582 noredhdropt:; 2583 2584 if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_src)) 2585 sip6->ip6_src.s6_addr16[1] = 0; 2586 if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_dst)) 2587 sip6->ip6_dst.s6_addr16[1] = 0; 2588 #if 0 2589 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src)) 2590 ip6->ip6_src.s6_addr16[1] = 0; 2591 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) 2592 ip6->ip6_dst.s6_addr16[1] = 0; 2593 #endif 2594 if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_target)) 2595 nd_rd->nd_rd_target.s6_addr16[1] = 0; 2596 if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_dst)) 2597 nd_rd->nd_rd_dst.s6_addr16[1] = 0; 2598 2599 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 2600 2601 nd_rd->nd_rd_cksum = 0; 2602 nd_rd->nd_rd_cksum 2603 = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen)); 2604 2605 /* send the packet to outside... */ 2606 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL); 2607 if (outif) { 2608 icmp6_ifstat_inc(outif, ifs6_out_msg); 2609 icmp6_ifstat_inc(outif, ifs6_out_redirect); 2610 } 2611 icmp6stat.icp6s_outhist[ND_REDIRECT]++; 2612 2613 return; 2614 2615 fail: 2616 if (m) 2617 m_freem(m); 2618 if (m0) 2619 m_freem(m0); 2620 } 2621 2622 #ifdef HAVE_NRL_INPCB 2623 #define in6pcb inpcb 2624 #define in6p_icmp6filt inp_icmp6filt 2625 #endif 2626 /* 2627 * ICMPv6 socket option processing. 2628 */ 2629 void 2630 icmp6_ctloutput(netmsg_t msg) 2631 { 2632 struct socket *so = msg->ctloutput.base.nm_so; 2633 struct sockopt *sopt = msg->ctloutput.nm_sopt; 2634 int error = 0; 2635 int optlen; 2636 struct inpcb *inp = so->so_pcb; 2637 int level, op, optname; 2638 2639 if (sopt) { 2640 level = sopt->sopt_level; 2641 op = sopt->sopt_dir; 2642 optname = sopt->sopt_name; 2643 optlen = sopt->sopt_valsize; 2644 } else 2645 level = op = optname = optlen = 0; 2646 2647 if (level != IPPROTO_ICMPV6) { 2648 error = EINVAL; 2649 goto out; 2650 } 2651 2652 switch (op) { 2653 case PRCO_SETOPT: 2654 switch (optname) { 2655 case ICMP6_FILTER: 2656 { 2657 if (optlen != sizeof(struct icmp6_filter)) { 2658 error = EMSGSIZE; 2659 break; 2660 } 2661 if (inp->in6p_icmp6filt == NULL) { 2662 error = EINVAL; 2663 break; 2664 } 2665 error = soopt_to_kbuf(sopt, inp->in6p_icmp6filt, optlen, 2666 optlen); 2667 break; 2668 } 2669 2670 default: 2671 error = ENOPROTOOPT; 2672 break; 2673 } 2674 break; 2675 2676 case PRCO_GETOPT: 2677 switch (optname) { 2678 case ICMP6_FILTER: 2679 { 2680 if (inp->in6p_icmp6filt == NULL) { 2681 error = EINVAL; 2682 break; 2683 } 2684 soopt_from_kbuf(sopt, inp->in6p_icmp6filt, 2685 sizeof(struct icmp6_filter)); 2686 break; 2687 } 2688 2689 default: 2690 error = ENOPROTOOPT; 2691 break; 2692 } 2693 break; 2694 } 2695 out: 2696 lwkt_replymsg(&msg->ctloutput.base.lmsg, error); 2697 } 2698 #ifdef HAVE_NRL_INPCB 2699 #undef in6pcb 2700 #undef in6p_icmp6filt 2701 #endif 2702 2703 #ifndef HAVE_PPSRATECHECK 2704 #ifndef timersub 2705 #define timersub(tvp, uvp, vvp) \ 2706 do { \ 2707 (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec; \ 2708 (vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec; \ 2709 if ((vvp)->tv_usec < 0) { \ 2710 (vvp)->tv_sec--; \ 2711 (vvp)->tv_usec += 1000000; \ 2712 } \ 2713 } while (0) 2714 #endif 2715 2716 /* 2717 * ppsratecheck(): packets (or events) per second limitation. 2718 */ 2719 static int 2720 ppsratecheck(struct timeval *lasttime, int *curpps, 2721 int maxpps) /* maximum pps allowed */ 2722 { 2723 struct timeval tv, delta; 2724 int rv; 2725 2726 microtime(&tv); 2727 2728 timersub(&tv, lasttime, &delta); 2729 2730 /* 2731 * Check for 0,0 so that the message will be seen at least once. 2732 * If more than one second has passed since the last update of 2733 * lasttime, reset the counter. 2734 * 2735 * We do increment *curpps even in *curpps < maxpps case, as some may 2736 * try to use *curpps for stat purposes as well. 2737 */ 2738 if ((lasttime->tv_sec == 0 && lasttime->tv_usec == 0) || 2739 delta.tv_sec >= 1) { 2740 *lasttime = tv; 2741 *curpps = 0; 2742 rv = 1; 2743 } else if (maxpps < 0) 2744 rv = 1; 2745 else if (*curpps < maxpps) 2746 rv = 1; 2747 else 2748 rv = 0; 2749 2750 #if 1 /* DIAGNOSTIC? */ 2751 /* be careful about wrap-around */ 2752 if (*curpps + 1 > *curpps) 2753 *curpps = *curpps + 1; 2754 #else 2755 /* 2756 * assume that there's not too many calls to this function. 2757 * not sure if the assumption holds, as it depends on *caller's* 2758 * behavior, not the behavior of this function. 2759 * IMHO it is wrong to make assumption on the caller's behavior, 2760 * so the above #if is #if 1, not #ifdef DIAGNOSTIC. 2761 */ 2762 *curpps = *curpps + 1; 2763 #endif 2764 2765 return (rv); 2766 } 2767 #endif 2768 2769 /* 2770 * Perform rate limit check. 2771 * Returns 0 if it is okay to send the icmp6 packet. 2772 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate 2773 * limitation. 2774 * 2775 * XXX per-destination/type check necessary? 2776 */ 2777 static int 2778 icmp6_ratelimit(const struct in6_addr *dst, /* not used at this moment */ 2779 const int type, /* not used at this moment */ 2780 const int code) /* not used at this moment */ 2781 { 2782 int ret; 2783 2784 ret = 0; /* okay to send */ 2785 2786 /* PPS limit */ 2787 if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count, 2788 icmp6errppslim)) { 2789 /* The packet is subject to rate limit */ 2790 ret++; 2791 } 2792 2793 return ret; 2794 } 2795