Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/netinet6/icmp6.c
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1 /* $FreeBSD: 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, MB_DONTWAIT); 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, MB_DONTWAIT, 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, MB_DONTWAIT)) == 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, MB_DONTWAIT, m->m_type, M_PKTHDR); 676 if (n == NULL) { 677 /* Give up remote */ 678 break; 679 } 680 if (!m_dup_pkthdr(n, m, MB_DONTWAIT)) { 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, MB_DONTWAIT)) == 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, MB_DONTWAIT)) == 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, MB_DONTWAIT)) == 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, MB_DONTWAIT)) == 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, MB_DONTWAIT)) == 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_pru_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, MB_DONTWAIT, 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, MB_DONTWAIT, 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 struct ifnet *ifp; 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 1576 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) { 1577 switch (ni6->ni_code) { 1578 case ICMP6_NI_SUBJ_IPV6: 1579 if (subj == NULL) /* must be impossible... */ 1580 return (0); 1581 subj_ip6 = (struct sockaddr_in6 *)subj; 1582 break; 1583 default: 1584 /* 1585 * XXX: we only support IPv6 subject address for 1586 * this Qtype. 1587 */ 1588 return (0); 1589 } 1590 } 1591 1592 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) 1593 { 1594 struct ifaddr_container *ifac; 1595 1596 addrsofif = 0; 1597 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) 1598 { 1599 struct ifaddr *ifa = ifac->ifa; 1600 1601 if (ifa->ifa_addr->sa_family != AF_INET6) 1602 continue; 1603 ifa6 = (struct in6_ifaddr *)ifa; 1604 1605 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 && 1606 IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr, 1607 &ifa6->ia_addr.sin6_addr)) 1608 iffound = 1; 1609 1610 /* 1611 * IPv4-mapped addresses can only be returned by a 1612 * Node Information proxy, since they represent 1613 * addresses of IPv4-only nodes, which perforce do 1614 * not implement this protocol. 1615 * [icmp-name-lookups-07, Section 5.4] 1616 * So we don't support NI_NODEADDR_FLAG_COMPAT in 1617 * this function at this moment. 1618 */ 1619 1620 /* What do we have to do about ::1? */ 1621 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) { 1622 case IPV6_ADDR_SCOPE_LINKLOCAL: 1623 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1624 continue; 1625 break; 1626 case IPV6_ADDR_SCOPE_SITELOCAL: 1627 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1628 continue; 1629 break; 1630 case IPV6_ADDR_SCOPE_GLOBAL: 1631 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1632 continue; 1633 break; 1634 default: 1635 continue; 1636 } 1637 1638 /* 1639 * check if anycast is okay. 1640 * XXX: just experimental. not in the spec. 1641 */ 1642 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) && 1643 !(niflags & NI_NODEADDR_FLAG_ANYCAST)) 1644 continue; /* we need only unicast addresses */ 1645 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) && 1646 (icmp6_nodeinfo & 4) == 0) { 1647 continue; 1648 } 1649 addrsofif++; /* count the address */ 1650 } 1651 if (iffound) { 1652 *ifpp = ifp; 1653 return (addrsofif); 1654 } 1655 1656 addrs += addrsofif; 1657 } 1658 1659 return (addrs); 1660 } 1661 1662 static int 1663 ni6_store_addrs(struct icmp6_nodeinfo *ni6, struct icmp6_nodeinfo *nni6, 1664 struct ifnet *ifp0, int resid) 1665 { 1666 struct ifnet *ifp = ifp0 ? ifp0 : TAILQ_FIRST(&ifnet); 1667 struct in6_ifaddr *ifa6; 1668 struct ifnet *ifp_dep = NULL; 1669 int copied = 0, allow_deprecated = 0; 1670 u_char *cp = (u_char *)(nni6 + 1); 1671 int niflags = ni6->ni_flags; 1672 u_int32_t ltime; 1673 1674 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL)) 1675 return (0); /* needless to copy */ 1676 1677 again: 1678 1679 for (; ifp; ifp = TAILQ_NEXT(ifp, if_list)) 1680 { 1681 struct ifaddr_container *ifac; 1682 1683 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1684 struct ifaddr *ifa = ifac->ifa; 1685 1686 if (ifa->ifa_addr->sa_family != AF_INET6) 1687 continue; 1688 ifa6 = (struct in6_ifaddr *)ifa; 1689 1690 if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) && 1691 allow_deprecated == 0) { 1692 /* 1693 * prefererred address should be put before 1694 * deprecated addresses. 1695 */ 1696 1697 /* record the interface for later search */ 1698 if (ifp_dep == NULL) 1699 ifp_dep = ifp; 1700 1701 continue; 1702 } 1703 else if (!(ifa6->ia6_flags & IN6_IFF_DEPRECATED) && 1704 allow_deprecated != 0) 1705 continue; /* we now collect deprecated addrs */ 1706 1707 /* What do we have to do about ::1? */ 1708 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) { 1709 case IPV6_ADDR_SCOPE_LINKLOCAL: 1710 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1711 continue; 1712 break; 1713 case IPV6_ADDR_SCOPE_SITELOCAL: 1714 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1715 continue; 1716 break; 1717 case IPV6_ADDR_SCOPE_GLOBAL: 1718 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1719 continue; 1720 break; 1721 default: 1722 continue; 1723 } 1724 1725 /* 1726 * check if anycast is okay. 1727 * XXX: just experimental. not in the spec. 1728 */ 1729 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) && 1730 !(niflags & NI_NODEADDR_FLAG_ANYCAST)) 1731 continue; 1732 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) && 1733 (icmp6_nodeinfo & 4) == 0) { 1734 continue; 1735 } 1736 1737 /* now we can copy the address */ 1738 if (resid < sizeof(struct in6_addr) + 1739 sizeof(u_int32_t)) { 1740 /* 1741 * We give up much more copy. 1742 * Set the truncate flag and return. 1743 */ 1744 nni6->ni_flags |= 1745 NI_NODEADDR_FLAG_TRUNCATE; 1746 return (copied); 1747 } 1748 1749 /* 1750 * Set the TTL of the address. 1751 * The TTL value should be one of the following 1752 * according to the specification: 1753 * 1754 * 1. The remaining lifetime of a DHCP lease on the 1755 * address, or 1756 * 2. The remaining Valid Lifetime of a prefix from 1757 * which the address was derived through Stateless 1758 * Autoconfiguration. 1759 * 1760 * Note that we currently do not support stateful 1761 * address configuration by DHCPv6, so the former 1762 * case can't happen. 1763 */ 1764 if (ifa6->ia6_lifetime.ia6t_expire == 0) 1765 ltime = ND6_INFINITE_LIFETIME; 1766 else { 1767 if (ifa6->ia6_lifetime.ia6t_expire > 1768 time_uptime) 1769 ltime = htonl(ifa6->ia6_lifetime.ia6t_expire - time_uptime); 1770 else 1771 ltime = 0; 1772 } 1773 1774 bcopy(<ime, cp, sizeof(u_int32_t)); 1775 cp += sizeof(u_int32_t); 1776 1777 /* copy the address itself */ 1778 bcopy(&ifa6->ia_addr.sin6_addr, cp, 1779 sizeof(struct in6_addr)); 1780 /* XXX: KAME link-local hack; remove ifindex */ 1781 if (IN6_IS_ADDR_LINKLOCAL(&ifa6->ia_addr.sin6_addr)) 1782 ((struct in6_addr *)cp)->s6_addr16[1] = 0; 1783 cp += sizeof(struct in6_addr); 1784 1785 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1786 copied += (sizeof(struct in6_addr) + 1787 sizeof(u_int32_t)); 1788 } 1789 if (ifp0) /* we need search only on the specified IF */ 1790 break; 1791 } 1792 1793 if (allow_deprecated == 0 && ifp_dep != NULL) { 1794 ifp = ifp_dep; 1795 allow_deprecated = 1; 1796 1797 goto again; 1798 } 1799 1800 return (copied); 1801 } 1802 1803 /* 1804 * XXX almost dup'ed code with rip6_input. 1805 */ 1806 static int 1807 icmp6_rip6_input(struct mbuf **mp, int off) 1808 { 1809 struct mbuf *m = *mp; 1810 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1811 struct in6pcb *in6p; 1812 struct in6pcb *last = NULL; 1813 struct sockaddr_in6 rip6src; 1814 struct icmp6_hdr *icmp6; 1815 struct mbuf *opts = NULL; 1816 1817 #ifndef PULLDOWN_TEST 1818 /* this is assumed to be safe. */ 1819 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off); 1820 #else 1821 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 1822 if (icmp6 == NULL) { 1823 /* m is already reclaimed */ 1824 return IPPROTO_DONE; 1825 } 1826 #endif 1827 1828 bzero(&rip6src, sizeof(rip6src)); 1829 rip6src.sin6_len = sizeof(struct sockaddr_in6); 1830 rip6src.sin6_family = AF_INET6; 1831 /* KAME hack: recover scopeid */ 1832 in6_recoverscope(&rip6src, &ip6->ip6_src, m->m_pkthdr.rcvif); 1833 1834 LIST_FOREACH(in6p, &ripcbinfo.pcblisthead, inp_list) 1835 { 1836 if (in6p->inp_flags & INP_PLACEMARKER) 1837 continue; 1838 if ((in6p->inp_vflag & INP_IPV6) == 0) 1839 continue; 1840 #ifdef HAVE_NRL_INPCB 1841 if (!(in6p->in6p_flags & INP_IPV6)) 1842 continue; 1843 #endif 1844 if (in6p->in6p_ip6_nxt != IPPROTO_ICMPV6) 1845 continue; 1846 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && 1847 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst)) 1848 continue; 1849 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) && 1850 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src)) 1851 continue; 1852 if (in6p->in6p_icmp6filt 1853 && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type, 1854 in6p->in6p_icmp6filt)) 1855 continue; 1856 if (last) { 1857 struct socket *so; 1858 struct mbuf *n; 1859 1860 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { 1861 if (last->in6p_flags & IN6P_CONTROLOPTS) 1862 ip6_savecontrol(last, &opts, ip6, n); 1863 /* strip intermediate headers */ 1864 m_adj(n, off); 1865 so = last->in6p_socket; 1866 lwkt_gettoken(&so->so_rcv.ssb_token); 1867 if (ssb_appendaddr(&so->so_rcv, 1868 (struct sockaddr *)&rip6src, 1869 n, opts) == 0) { 1870 /* should notify about lost packet */ 1871 m_freem(n); 1872 if (opts) 1873 m_freem(opts); 1874 } else { 1875 sorwakeup(so); 1876 } 1877 lwkt_reltoken(&so->so_rcv.ssb_token); 1878 opts = NULL; 1879 } 1880 } 1881 last = in6p; 1882 } 1883 if (last) { 1884 struct socket *so; 1885 1886 if (last->in6p_flags & IN6P_CONTROLOPTS) 1887 ip6_savecontrol(last, &opts, ip6, m); 1888 /* strip intermediate headers */ 1889 m_adj(m, off); 1890 so = last->in6p_socket; 1891 lwkt_gettoken(&so->so_rcv.ssb_token); 1892 if (ssb_appendaddr(&so->so_rcv, (struct sockaddr *)&rip6src, 1893 m, opts) == 0) { 1894 m_freem(m); 1895 if (opts) 1896 m_freem(opts); 1897 } else { 1898 sorwakeup(so); 1899 } 1900 lwkt_reltoken(&so->so_rcv.ssb_token); 1901 } else { 1902 m_freem(m); 1903 ip6stat.ip6s_delivered--; 1904 } 1905 return IPPROTO_DONE; 1906 } 1907 1908 /* 1909 * Reflect the ip6 packet back to the source. 1910 * OFF points to the icmp6 header, counted from the top of the mbuf. 1911 */ 1912 void 1913 icmp6_reflect(struct mbuf *m, size_t off) 1914 { 1915 struct ip6_hdr *ip6; 1916 struct icmp6_hdr *icmp6; 1917 struct in6_ifaddr *ia; 1918 struct in6_addr t, *src = NULL; 1919 int plen; 1920 int type, code; 1921 struct ifnet *outif = NULL; 1922 struct sockaddr_in6 sa6_src, sa6_dst; 1923 #ifdef COMPAT_RFC1885 1924 int mtu = IPV6_MMTU; 1925 struct sockaddr_in6 *sin6 = &icmp6_reflect_rt.ro_dst; 1926 #endif 1927 1928 /* too short to reflect */ 1929 if (off < sizeof(struct ip6_hdr)) { 1930 nd6log((LOG_DEBUG, 1931 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n", 1932 (u_long)off, (u_long)sizeof(struct ip6_hdr), 1933 __FILE__, __LINE__)); 1934 goto bad; 1935 } 1936 1937 /* 1938 * If there are extra headers between IPv6 and ICMPv6, strip 1939 * off that header first. 1940 */ 1941 #ifdef DIAGNOSTIC 1942 if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN) 1943 panic("assumption failed in icmp6_reflect"); 1944 #endif 1945 if (off > sizeof(struct ip6_hdr)) { 1946 size_t l; 1947 struct ip6_hdr nip6; 1948 1949 l = off - sizeof(struct ip6_hdr); 1950 m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6); 1951 m_adj(m, l); 1952 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 1953 if (m->m_len < l) { 1954 if ((m = m_pullup(m, l)) == NULL) 1955 return; 1956 } 1957 bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6)); 1958 } else /* off == sizeof(struct ip6_hdr) */ { 1959 size_t 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 } 1966 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr); 1967 ip6 = mtod(m, struct ip6_hdr *); 1968 ip6->ip6_nxt = IPPROTO_ICMPV6; 1969 icmp6 = (struct icmp6_hdr *)(ip6 + 1); 1970 type = icmp6->icmp6_type; /* keep type for statistics */ 1971 code = icmp6->icmp6_code; /* ditto. */ 1972 1973 t = ip6->ip6_dst; 1974 /* 1975 * ip6_input() drops a packet if its src is multicast. 1976 * So, the src is never multicast. 1977 */ 1978 ip6->ip6_dst = ip6->ip6_src; 1979 1980 /* 1981 * XXX: make sure to embed scope zone information, using 1982 * already embedded IDs or the received interface (if any). 1983 * Note that rcvif may be NULL. 1984 * TODO: scoped routing case (XXX). 1985 */ 1986 bzero(&sa6_src, sizeof(sa6_src)); 1987 sa6_src.sin6_family = AF_INET6; 1988 sa6_src.sin6_len = sizeof(sa6_src); 1989 sa6_src.sin6_addr = ip6->ip6_dst; 1990 in6_recoverscope(&sa6_src, &ip6->ip6_dst, m->m_pkthdr.rcvif); 1991 in6_embedscope(&ip6->ip6_dst, &sa6_src, NULL, NULL); 1992 bzero(&sa6_dst, sizeof(sa6_dst)); 1993 sa6_dst.sin6_family = AF_INET6; 1994 sa6_dst.sin6_len = sizeof(sa6_dst); 1995 sa6_dst.sin6_addr = t; 1996 in6_recoverscope(&sa6_dst, &t, m->m_pkthdr.rcvif); 1997 in6_embedscope(&t, &sa6_dst, NULL, NULL); 1998 1999 #ifdef COMPAT_RFC1885 2000 /* 2001 * xxx guess MTU 2002 * RFC 1885 requires that echo reply should be truncated if it 2003 * does not fit in with (return) path MTU, but the description was 2004 * removed in the new spec. 2005 */ 2006 if (icmp6_reflect_rt.ro_rt == 0 || 2007 ! (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &ip6->ip6_dst))) { 2008 if (icmp6_reflect_rt.ro_rt) { 2009 RTFREE(icmp6_reflect_rt.ro_rt); 2010 icmp6_reflect_rt.ro_rt = 0; 2011 } 2012 bzero(sin6, sizeof(*sin6)); 2013 sin6->sin6_family = PF_INET6; 2014 sin6->sin6_len = sizeof(struct sockaddr_in6); 2015 sin6->sin6_addr = ip6->ip6_dst; 2016 2017 rtalloc_ign((struct route *)&icmp6_reflect_rt.ro_rt, 2018 RTF_PRCLONING); 2019 } 2020 2021 if (icmp6_reflect_rt.ro_rt == 0) 2022 goto bad; 2023 2024 if ((icmp6_reflect_rt.ro_rt->rt_flags & RTF_HOST) 2025 && mtu < icmp6_reflect_rt.ro_rt->rt_ifp->if_mtu) 2026 mtu = icmp6_reflect_rt.ro_rt->rt_rmx.rmx_mtu; 2027 2028 if (mtu < m->m_pkthdr.len) { 2029 plen -= (m->m_pkthdr.len - mtu); 2030 m_adj(m, mtu - m->m_pkthdr.len); 2031 } 2032 #endif 2033 /* 2034 * If the incoming packet was addressed directly to us(i.e. unicast), 2035 * use dst as the src for the reply. 2036 * The IN6_IFF_NOTREADY case would be VERY rare, but is possible 2037 * (for example) when we encounter an error while forwarding procedure 2038 * destined to a duplicated address of ours. 2039 */ 2040 for (ia = in6_ifaddr; ia; ia = ia->ia_next) 2041 if (IN6_ARE_ADDR_EQUAL(&t, &ia->ia_addr.sin6_addr) && 2042 (ia->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) { 2043 src = &t; 2044 break; 2045 } 2046 if (ia == NULL && IN6_IS_ADDR_LINKLOCAL(&t) && (m->m_flags & M_LOOP)) { 2047 /* 2048 * This is the case if the dst is our link-local address 2049 * and the sender is also ourselves. 2050 */ 2051 src = &t; 2052 } 2053 2054 if (src == NULL) { 2055 int e; 2056 struct route_in6 ro; 2057 2058 /* 2059 * This case matches to multicasts, our anycast, or unicasts 2060 * that we do not own. Select a source address based on the 2061 * source address of the erroneous packet. 2062 */ 2063 bzero(&ro, sizeof(ro)); 2064 src = in6_selectsrc(&sa6_src, NULL, NULL, &ro, NULL, &e, NULL); 2065 if (ro.ro_rt) 2066 RTFREE(ro.ro_rt); /* XXX: we could use this */ 2067 if (src == NULL) { 2068 nd6log((LOG_DEBUG, 2069 "icmp6_reflect: source can't be determined: " 2070 "dst=%s, error=%d\n", 2071 ip6_sprintf(&sa6_src.sin6_addr), e)); 2072 goto bad; 2073 } 2074 } 2075 2076 ip6->ip6_src = *src; 2077 2078 ip6->ip6_flow = 0; 2079 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2080 ip6->ip6_vfc |= IPV6_VERSION; 2081 ip6->ip6_nxt = IPPROTO_ICMPV6; 2082 if (m->m_pkthdr.rcvif) { 2083 /* XXX: This may not be the outgoing interface */ 2084 ip6->ip6_hlim = ND_IFINFO(m->m_pkthdr.rcvif)->chlim; 2085 } else 2086 ip6->ip6_hlim = ip6_defhlim; 2087 2088 icmp6->icmp6_cksum = 0; 2089 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6, 2090 sizeof(struct ip6_hdr), plen); 2091 2092 /* 2093 * XXX option handling 2094 */ 2095 2096 m->m_flags &= ~(M_BCAST|M_MCAST); 2097 2098 #ifdef COMPAT_RFC1885 2099 ip6_output(m, NULL, &icmp6_reflect_rt, 0, NULL, &outif, NULL); 2100 #else 2101 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL); 2102 #endif 2103 if (outif) 2104 icmp6_ifoutstat_inc(outif, type, code); 2105 2106 return; 2107 2108 bad: 2109 m_freem(m); 2110 return; 2111 } 2112 2113 void 2114 icmp6_fasttimo(void) 2115 { 2116 2117 mld6_fasttimeo(); 2118 } 2119 2120 static const char * 2121 icmp6_redirect_diag(struct in6_addr *src6, struct in6_addr *dst6, 2122 struct in6_addr *tgt6) 2123 { 2124 static char buf[1024]; 2125 ksnprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)", 2126 ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6)); 2127 return buf; 2128 } 2129 2130 void 2131 icmp6_redirect_input(struct mbuf *m, int off) 2132 { 2133 struct ifnet *ifp = m->m_pkthdr.rcvif; 2134 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 2135 struct nd_redirect *nd_rd; 2136 int icmp6len = ntohs(ip6->ip6_plen); 2137 char *lladdr = NULL; 2138 int lladdrlen = 0; 2139 #if 0 2140 u_char *redirhdr = NULL; 2141 int redirhdrlen = 0; 2142 #endif 2143 struct rtentry *rt = NULL; 2144 int is_router; 2145 int is_onlink; 2146 struct in6_addr src6 = ip6->ip6_src; 2147 struct in6_addr redtgt6; 2148 struct in6_addr reddst6; 2149 union nd_opts ndopts; 2150 2151 if (!m || !ifp) 2152 return; 2153 2154 /* XXX if we are router, we don't update route by icmp6 redirect */ 2155 if (ip6_forwarding) 2156 goto freeit; 2157 if (!icmp6_rediraccept) 2158 goto freeit; 2159 2160 #ifndef PULLDOWN_TEST 2161 IP6_EXTHDR_CHECK(m, off, icmp6len,); 2162 nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off); 2163 #else 2164 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len); 2165 if (nd_rd == NULL) { 2166 icmp6stat.icp6s_tooshort++; 2167 return; 2168 } 2169 #endif 2170 redtgt6 = nd_rd->nd_rd_target; 2171 reddst6 = nd_rd->nd_rd_dst; 2172 2173 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 2174 redtgt6.s6_addr16[1] = htons(ifp->if_index); 2175 if (IN6_IS_ADDR_LINKLOCAL(&reddst6)) 2176 reddst6.s6_addr16[1] = htons(ifp->if_index); 2177 2178 /* validation */ 2179 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) { 2180 nd6log((LOG_ERR, 2181 "ICMP6 redirect sent from %s rejected; " 2182 "must be from linklocal\n", ip6_sprintf(&src6))); 2183 goto bad; 2184 } 2185 if (ip6->ip6_hlim != 255) { 2186 nd6log((LOG_ERR, 2187 "ICMP6 redirect sent from %s rejected; " 2188 "hlim=%d (must be 255)\n", 2189 ip6_sprintf(&src6), ip6->ip6_hlim)); 2190 goto bad; 2191 } 2192 { 2193 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */ 2194 struct sockaddr_in6 sin6; 2195 struct in6_addr *gw6; 2196 2197 bzero(&sin6, sizeof(sin6)); 2198 sin6.sin6_family = AF_INET6; 2199 sin6.sin6_len = sizeof(struct sockaddr_in6); 2200 bcopy(&reddst6, &sin6.sin6_addr, sizeof reddst6); 2201 rt = rtpurelookup((struct sockaddr *)&sin6); 2202 if (rt != NULL) { 2203 if (rt->rt_gateway == NULL || 2204 rt->rt_gateway->sa_family != AF_INET6) { 2205 nd6log((LOG_ERR, 2206 "ICMP6 redirect rejected; no route " 2207 "with inet6 gateway found for redirect dst: %s\n", 2208 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2209 --rt->rt_refcnt; 2210 goto bad; 2211 } 2212 2213 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr); 2214 if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) { 2215 nd6log((LOG_ERR, 2216 "ICMP6 redirect rejected; " 2217 "not equal to gw-for-src=%s (must be same): " 2218 "%s\n", 2219 ip6_sprintf(gw6), 2220 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2221 --rt->rt_refcnt; 2222 goto bad; 2223 } 2224 } else { 2225 nd6log((LOG_ERR, 2226 "ICMP6 redirect rejected; " 2227 "no route found for redirect dst: %s\n", 2228 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2229 goto bad; 2230 } 2231 --rt->rt_refcnt; 2232 rt = NULL; 2233 } 2234 if (IN6_IS_ADDR_MULTICAST(&reddst6)) { 2235 nd6log((LOG_ERR, 2236 "ICMP6 redirect rejected; " 2237 "redirect dst must be unicast: %s\n", 2238 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2239 goto bad; 2240 } 2241 2242 is_router = is_onlink = 0; 2243 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 2244 is_router = 1; /* router case */ 2245 if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0) 2246 is_onlink = 1; /* on-link destination case */ 2247 if (!is_router && !is_onlink) { 2248 nd6log((LOG_ERR, 2249 "ICMP6 redirect rejected; " 2250 "neither router case nor onlink case: %s\n", 2251 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2252 goto bad; 2253 } 2254 /* validation passed */ 2255 2256 icmp6len -= sizeof(*nd_rd); 2257 nd6_option_init(nd_rd + 1, icmp6len, &ndopts); 2258 if (nd6_options(&ndopts) < 0) { 2259 nd6log((LOG_INFO, "icmp6_redirect_input: " 2260 "invalid ND option, rejected: %s\n", 2261 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2262 /* nd6_options have incremented stats */ 2263 goto freeit; 2264 } 2265 2266 if (ndopts.nd_opts_tgt_lladdr) { 2267 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 2268 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 2269 } 2270 2271 #if 0 2272 if (ndopts.nd_opts_rh) { 2273 redirhdrlen = ndopts.nd_opts_rh->nd_opt_rh_len; 2274 redirhdr = (u_char *)(ndopts.nd_opts_rh + 1); /* xxx */ 2275 } 2276 #endif 2277 2278 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 2279 nd6log((LOG_INFO, 2280 "icmp6_redirect_input: lladdrlen mismatch for %s " 2281 "(if %d, icmp6 packet %d): %s\n", 2282 ip6_sprintf(&redtgt6), ifp->if_addrlen, lladdrlen - 2, 2283 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2284 goto bad; 2285 } 2286 2287 /* RFC 2461 8.3 */ 2288 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT, 2289 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER); 2290 2291 if (!is_onlink) { /* better router case. perform rtredirect. */ 2292 /* perform rtredirect */ 2293 struct sockaddr_in6 sdst; 2294 struct sockaddr_in6 sgw; 2295 struct sockaddr_in6 ssrc; 2296 2297 bzero(&sdst, sizeof(sdst)); 2298 bzero(&sgw, sizeof(sgw)); 2299 bzero(&ssrc, sizeof(ssrc)); 2300 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6; 2301 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len = 2302 sizeof(struct sockaddr_in6); 2303 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr)); 2304 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2305 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr)); 2306 rtredirect((struct sockaddr *)&sdst, (struct sockaddr *)&sgw, 2307 NULL, RTF_GATEWAY | RTF_HOST, 2308 (struct sockaddr *)&ssrc); 2309 } 2310 /* finally update cached route in each socket via kpfctlinput */ 2311 { 2312 struct sockaddr_in6 sdst; 2313 2314 bzero(&sdst, sizeof(sdst)); 2315 sdst.sin6_family = AF_INET6; 2316 sdst.sin6_len = sizeof(struct sockaddr_in6); 2317 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2318 kpfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst); 2319 #ifdef IPSEC 2320 key_sa_routechange((struct sockaddr *)&sdst); 2321 #endif 2322 } 2323 2324 freeit: 2325 m_freem(m); 2326 return; 2327 2328 bad: 2329 icmp6stat.icp6s_badredirect++; 2330 m_freem(m); 2331 } 2332 2333 void 2334 icmp6_redirect_output(struct mbuf *m0, struct rtentry *rt) 2335 { 2336 struct ifnet *ifp; /* my outgoing interface */ 2337 struct in6_addr *ifp_ll6; 2338 struct in6_addr *router_ll6; 2339 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */ 2340 struct mbuf *m = NULL; /* newly allocated one */ 2341 struct ip6_hdr *ip6; /* m as struct ip6_hdr */ 2342 struct nd_redirect *nd_rd; 2343 size_t maxlen; 2344 u_char *p; 2345 struct ifnet *outif = NULL; 2346 struct sockaddr_in6 src_sa; 2347 2348 icmp6_errcount(&icmp6stat.icp6s_outerrhist, ND_REDIRECT, 0); 2349 2350 /* if we are not router, we don't send icmp6 redirect */ 2351 if (!ip6_forwarding || ip6_accept_rtadv) 2352 goto fail; 2353 2354 /* sanity check */ 2355 if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp)) 2356 goto fail; 2357 2358 /* 2359 * Address check: 2360 * the source address must identify a neighbor, and 2361 * the destination address must not be a multicast address 2362 * [RFC 2461, sec 8.2] 2363 */ 2364 sip6 = mtod(m0, struct ip6_hdr *); 2365 bzero(&src_sa, sizeof(src_sa)); 2366 src_sa.sin6_family = AF_INET6; 2367 src_sa.sin6_len = sizeof(src_sa); 2368 src_sa.sin6_addr = sip6->ip6_src; 2369 /* we don't currently use sin6_scope_id, but eventually use it */ 2370 src_sa.sin6_scope_id = in6_addr2scopeid(ifp, &sip6->ip6_src); 2371 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0) 2372 goto fail; 2373 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst)) 2374 goto fail; /* what should we do here? */ 2375 2376 /* rate limit */ 2377 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0)) 2378 goto fail; 2379 2380 /* 2381 * Since we are going to append up to 1280 bytes (= IPV6_MMTU), 2382 * we almost always ask for an mbuf cluster for simplicity. 2383 * (MHLEN < IPV6_MMTU is almost always true) 2384 */ 2385 #if IPV6_MMTU >= MCLBYTES 2386 # error assumption failed about IPV6_MMTU and MCLBYTES 2387 #endif 2388 m = m_getb(IPV6_MMTU, MB_DONTWAIT, MT_HEADER, M_PKTHDR); 2389 if (!m) 2390 goto fail; 2391 m->m_len = 0; 2392 maxlen = M_TRAILINGSPACE(m); 2393 maxlen = min(IPV6_MMTU, maxlen); 2394 /* just for safety */ 2395 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) + 2396 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) { 2397 goto fail; 2398 } 2399 2400 { 2401 /* get ip6 linklocal address for ifp(my outgoing interface). */ 2402 struct in6_ifaddr *ia; 2403 if ((ia = in6ifa_ifpforlinklocal(ifp, 2404 IN6_IFF_NOTREADY| 2405 IN6_IFF_ANYCAST)) == NULL) 2406 goto fail; 2407 ifp_ll6 = &ia->ia_addr.sin6_addr; 2408 } 2409 2410 /* get ip6 linklocal address for the router. */ 2411 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) { 2412 struct sockaddr_in6 *sin6; 2413 sin6 = (struct sockaddr_in6 *)rt->rt_gateway; 2414 router_ll6 = &sin6->sin6_addr; 2415 if (!IN6_IS_ADDR_LINKLOCAL(router_ll6)) 2416 router_ll6 = NULL; 2417 } else 2418 router_ll6 = NULL; 2419 2420 /* ip6 */ 2421 ip6 = mtod(m, struct ip6_hdr *); 2422 ip6->ip6_flow = 0; 2423 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2424 ip6->ip6_vfc |= IPV6_VERSION; 2425 /* ip6->ip6_plen will be set later */ 2426 ip6->ip6_nxt = IPPROTO_ICMPV6; 2427 ip6->ip6_hlim = 255; 2428 /* ip6->ip6_src must be linklocal addr for my outgoing if. */ 2429 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr)); 2430 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr)); 2431 2432 /* ND Redirect */ 2433 nd_rd = (struct nd_redirect *)(ip6 + 1); 2434 nd_rd->nd_rd_type = ND_REDIRECT; 2435 nd_rd->nd_rd_code = 0; 2436 nd_rd->nd_rd_reserved = 0; 2437 if (rt->rt_flags & RTF_GATEWAY) { 2438 /* 2439 * nd_rd->nd_rd_target must be a link-local address in 2440 * better router cases. 2441 */ 2442 if (!router_ll6) 2443 goto fail; 2444 bcopy(router_ll6, &nd_rd->nd_rd_target, 2445 sizeof(nd_rd->nd_rd_target)); 2446 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2447 sizeof(nd_rd->nd_rd_dst)); 2448 } else { 2449 /* make sure redtgt == reddst */ 2450 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target, 2451 sizeof(nd_rd->nd_rd_target)); 2452 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2453 sizeof(nd_rd->nd_rd_dst)); 2454 } 2455 2456 p = (u_char *)(nd_rd + 1); 2457 2458 if (!router_ll6) 2459 goto nolladdropt; 2460 2461 { 2462 /* target lladdr option */ 2463 struct rtentry *rt_router = NULL; 2464 int len; 2465 struct sockaddr_dl *sdl; 2466 struct nd_opt_hdr *nd_opt; 2467 char *lladdr; 2468 2469 rt_router = nd6_lookup(router_ll6, 0, ifp); 2470 if (!rt_router) 2471 goto nolladdropt; 2472 len = sizeof(*nd_opt) + ifp->if_addrlen; 2473 len = (len + 7) & ~7; /* round by 8 */ 2474 /* safety check */ 2475 if (len + (p - (u_char *)ip6) > maxlen) 2476 goto nolladdropt; 2477 if (!(rt_router->rt_flags & RTF_GATEWAY) && 2478 (rt_router->rt_flags & RTF_LLINFO) && 2479 (rt_router->rt_gateway->sa_family == AF_LINK) && 2480 (sdl = (struct sockaddr_dl *)rt_router->rt_gateway) && 2481 sdl->sdl_alen) { 2482 nd_opt = (struct nd_opt_hdr *)p; 2483 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 2484 nd_opt->nd_opt_len = len >> 3; 2485 lladdr = (char *)(nd_opt + 1); 2486 bcopy(LLADDR(sdl), lladdr, ifp->if_addrlen); 2487 p += len; 2488 } 2489 } 2490 nolladdropt:; 2491 2492 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2493 2494 /* just to be safe */ 2495 #ifdef M_DECRYPTED /*not openbsd*/ 2496 if (m0->m_flags & M_DECRYPTED) 2497 goto noredhdropt; 2498 #endif 2499 if (p - (u_char *)ip6 > maxlen) 2500 goto noredhdropt; 2501 2502 { 2503 /* redirected header option */ 2504 int len; 2505 struct nd_opt_rd_hdr *nd_opt_rh; 2506 2507 /* 2508 * compute the maximum size for icmp6 redirect header option. 2509 * XXX room for auth header? 2510 */ 2511 len = maxlen - (p - (u_char *)ip6); 2512 len &= ~7; 2513 2514 /* This is just for simplicity. */ 2515 if (m0->m_pkthdr.len != m0->m_len) { 2516 if (m0->m_next) { 2517 m_freem(m0->m_next); 2518 m0->m_next = NULL; 2519 } 2520 m0->m_pkthdr.len = m0->m_len; 2521 } 2522 2523 /* 2524 * Redirected header option spec (RFC2461 4.6.3) talks nothing 2525 * about padding/truncate rule for the original IP packet. 2526 * From the discussion on IPv6imp in Feb 1999, the consensus was: 2527 * - "attach as much as possible" is the goal 2528 * - pad if not aligned (original size can be guessed by original 2529 * ip6 header) 2530 * Following code adds the padding if it is simple enough, 2531 * and truncates if not. 2532 */ 2533 if (m0->m_next || m0->m_pkthdr.len != m0->m_len) 2534 panic("assumption failed in %s:%d", __FILE__, __LINE__); 2535 2536 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) { 2537 /* not enough room, truncate */ 2538 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh); 2539 } else { 2540 /* enough room, pad or truncate */ 2541 size_t extra; 2542 2543 extra = m0->m_pkthdr.len % 8; 2544 if (extra) { 2545 /* pad if easy enough, truncate if not */ 2546 if (8 - extra <= M_TRAILINGSPACE(m0)) { 2547 /* pad */ 2548 m0->m_len += (8 - extra); 2549 m0->m_pkthdr.len += (8 - extra); 2550 } else { 2551 /* truncate */ 2552 m0->m_pkthdr.len -= extra; 2553 m0->m_len -= extra; 2554 } 2555 } 2556 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh); 2557 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh); 2558 } 2559 2560 nd_opt_rh = (struct nd_opt_rd_hdr *)p; 2561 bzero(nd_opt_rh, sizeof(*nd_opt_rh)); 2562 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER; 2563 nd_opt_rh->nd_opt_rh_len = len >> 3; 2564 p += sizeof(*nd_opt_rh); 2565 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2566 2567 /* connect m0 to m */ 2568 m->m_next = m0; 2569 m->m_pkthdr.len = m->m_len + m0->m_len; 2570 } 2571 noredhdropt:; 2572 2573 if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_src)) 2574 sip6->ip6_src.s6_addr16[1] = 0; 2575 if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_dst)) 2576 sip6->ip6_dst.s6_addr16[1] = 0; 2577 #if 0 2578 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src)) 2579 ip6->ip6_src.s6_addr16[1] = 0; 2580 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) 2581 ip6->ip6_dst.s6_addr16[1] = 0; 2582 #endif 2583 if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_target)) 2584 nd_rd->nd_rd_target.s6_addr16[1] = 0; 2585 if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_dst)) 2586 nd_rd->nd_rd_dst.s6_addr16[1] = 0; 2587 2588 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 2589 2590 nd_rd->nd_rd_cksum = 0; 2591 nd_rd->nd_rd_cksum 2592 = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen)); 2593 2594 /* send the packet to outside... */ 2595 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL); 2596 if (outif) { 2597 icmp6_ifstat_inc(outif, ifs6_out_msg); 2598 icmp6_ifstat_inc(outif, ifs6_out_redirect); 2599 } 2600 icmp6stat.icp6s_outhist[ND_REDIRECT]++; 2601 2602 return; 2603 2604 fail: 2605 if (m) 2606 m_freem(m); 2607 if (m0) 2608 m_freem(m0); 2609 } 2610 2611 #ifdef HAVE_NRL_INPCB 2612 #define in6pcb inpcb 2613 #define in6p_icmp6filt inp_icmp6filt 2614 #endif 2615 /* 2616 * ICMPv6 socket option processing. 2617 */ 2618 void 2619 icmp6_ctloutput(netmsg_t msg) 2620 { 2621 struct socket *so = msg->ctloutput.base.nm_so; 2622 struct sockopt *sopt = msg->ctloutput.nm_sopt; 2623 int error = 0; 2624 int optlen; 2625 struct inpcb *inp = so->so_pcb; 2626 int level, op, optname; 2627 2628 if (sopt) { 2629 level = sopt->sopt_level; 2630 op = sopt->sopt_dir; 2631 optname = sopt->sopt_name; 2632 optlen = sopt->sopt_valsize; 2633 } else 2634 level = op = optname = optlen = 0; 2635 2636 if (level != IPPROTO_ICMPV6) { 2637 error = EINVAL; 2638 goto out; 2639 } 2640 2641 switch (op) { 2642 case PRCO_SETOPT: 2643 switch (optname) { 2644 case ICMP6_FILTER: 2645 { 2646 if (optlen != sizeof(struct icmp6_filter)) { 2647 error = EMSGSIZE; 2648 break; 2649 } 2650 if (inp->in6p_icmp6filt == NULL) { 2651 error = EINVAL; 2652 break; 2653 } 2654 error = soopt_to_kbuf(sopt, inp->in6p_icmp6filt, optlen, 2655 optlen); 2656 break; 2657 } 2658 2659 default: 2660 error = ENOPROTOOPT; 2661 break; 2662 } 2663 break; 2664 2665 case PRCO_GETOPT: 2666 switch (optname) { 2667 case ICMP6_FILTER: 2668 { 2669 if (inp->in6p_icmp6filt == NULL) { 2670 error = EINVAL; 2671 break; 2672 } 2673 soopt_from_kbuf(sopt, inp->in6p_icmp6filt, 2674 sizeof(struct icmp6_filter)); 2675 break; 2676 } 2677 2678 default: 2679 error = ENOPROTOOPT; 2680 break; 2681 } 2682 break; 2683 } 2684 out: 2685 lwkt_replymsg(&msg->ctloutput.base.lmsg, error); 2686 } 2687 #ifdef HAVE_NRL_INPCB 2688 #undef in6pcb 2689 #undef in6p_icmp6filt 2690 #endif 2691 2692 #ifndef HAVE_PPSRATECHECK 2693 #ifndef timersub 2694 #define timersub(tvp, uvp, vvp) \ 2695 do { \ 2696 (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec; \ 2697 (vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec; \ 2698 if ((vvp)->tv_usec < 0) { \ 2699 (vvp)->tv_sec--; \ 2700 (vvp)->tv_usec += 1000000; \ 2701 } \ 2702 } while (0) 2703 #endif 2704 2705 /* 2706 * ppsratecheck(): packets (or events) per second limitation. 2707 */ 2708 static int 2709 ppsratecheck(struct timeval *lasttime, int *curpps, 2710 int maxpps) /* maximum pps allowed */ 2711 { 2712 struct timeval tv, delta; 2713 int rv; 2714 2715 microtime(&tv); 2716 2717 timersub(&tv, lasttime, &delta); 2718 2719 /* 2720 * Check for 0,0 so that the message will be seen at least once. 2721 * If more than one second has passed since the last update of 2722 * lasttime, reset the counter. 2723 * 2724 * We do increment *curpps even in *curpps < maxpps case, as some may 2725 * try to use *curpps for stat purposes as well. 2726 */ 2727 if ((lasttime->tv_sec == 0 && lasttime->tv_usec == 0) || 2728 delta.tv_sec >= 1) { 2729 *lasttime = tv; 2730 *curpps = 0; 2731 rv = 1; 2732 } else if (maxpps < 0) 2733 rv = 1; 2734 else if (*curpps < maxpps) 2735 rv = 1; 2736 else 2737 rv = 0; 2738 2739 #if 1 /* DIAGNOSTIC? */ 2740 /* be careful about wrap-around */ 2741 if (*curpps + 1 > *curpps) 2742 *curpps = *curpps + 1; 2743 #else 2744 /* 2745 * assume that there's not too many calls to this function. 2746 * not sure if the assumption holds, as it depends on *caller's* 2747 * behavior, not the behavior of this function. 2748 * IMHO it is wrong to make assumption on the caller's behavior, 2749 * so the above #if is #if 1, not #ifdef DIAGNOSTIC. 2750 */ 2751 *curpps = *curpps + 1; 2752 #endif 2753 2754 return (rv); 2755 } 2756 #endif 2757 2758 /* 2759 * Perform rate limit check. 2760 * Returns 0 if it is okay to send the icmp6 packet. 2761 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate 2762 * limitation. 2763 * 2764 * XXX per-destination/type check necessary? 2765 */ 2766 static int 2767 icmp6_ratelimit(const struct in6_addr *dst, /* not used at this moment */ 2768 const int type, /* not used at this moment */ 2769 const int code) /* not used at this moment */ 2770 { 2771 int ret; 2772 2773 ret = 0; /* okay to send */ 2774 2775 /* PPS limit */ 2776 if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count, 2777 icmp6errppslim)) { 2778 /* The packet is subject to rate limit */ 2779 ret++; 2780 } 2781 2782 return ret; 2783 }
Cache object: e495dd27bccacd7eeb28865e6d8fae52
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