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 #include <net/netisr2.h> 89 #include <net/netmsg2.h> 90 91 #include <netinet/in.h> 92 #include <netinet/in_var.h> 93 #include <netinet/ip6.h> 94 #include <netinet6/ip6_var.h> 95 #include <netinet/icmp6.h> 96 #include <netinet6/mld6_var.h> 97 #include <netinet/in_pcb.h> 98 #include <netinet6/in6_pcb.h> 99 #include <netinet6/nd6.h> 100 #include <netinet6/in6_ifattach.h> 101 #include <netinet6/ip6protosw.h> 102 103 #ifdef IPSEC 104 #include <netinet6/ipsec.h> 105 #include <netproto/key/key.h> 106 #endif 107 108 #ifdef FAST_IPSEC 109 #include <netproto/ipsec/ipsec.h> 110 #include <netproto/ipsec/key.h> 111 #define IPSEC 112 #endif 113 114 #include <net/net_osdep.h> 115 116 #ifdef HAVE_NRL_INPCB 117 /* inpcb members */ 118 #define in6pcb inpcb 119 #define in6p_laddr inp_laddr6 120 #define in6p_faddr inp_faddr6 121 #define in6p_icmp6filt inp_icmp6filt 122 #define in6p_route inp_route 123 #define in6p_socket inp_socket 124 #define in6p_flags inp_flags 125 #define in6p_moptions inp_moptions6 126 #define in6p_outputopts inp_outputopts6 127 #define in6p_ip6 inp_ipv6 128 #define in6p_flowinfo inp_flowinfo 129 #define in6p_sp inp_sp 130 #define in6p_next inp_next 131 #define in6p_prev inp_prev 132 /* function names */ 133 #define in6_pcbdetach in_pcbdetach 134 #define in6_rtchange in_rtchange 135 136 /* 137 * for KAME src sync over BSD*'s. XXX: FreeBSD (>=3) are VERY different from 138 * others... 139 */ 140 #define in6p_ip6_nxt inp_ipv6.ip6_nxt 141 #endif 142 143 #define ICMP6_FASTTIMO (hz / PR_FASTHZ) 144 145 /* 146 * ppratecheck() is available, so define it here. 147 */ 148 #define HAVE_PPSRATECHECK 149 150 extern struct domain inet6domain; 151 extern struct protosw inet6sw[]; 152 extern u_char ip6_protox[]; 153 154 struct icmp6stat icmp6stat; 155 156 extern struct inpcbinfo ripcbinfo; 157 extern int icmp6errppslim; 158 static int icmp6errpps_count = 0; 159 static struct timeval icmp6errppslim_last; 160 extern int icmp6_nodeinfo; 161 162 static void icmp6_errcount (struct icmp6errstat *, int, int); 163 static int icmp6_rip6_input (struct mbuf **, int); 164 static int icmp6_ratelimit (const struct in6_addr *, const int, const int); 165 static const char *icmp6_redirect_diag (struct in6_addr *, 166 struct in6_addr *, struct in6_addr *); 167 #ifndef HAVE_PPSRATECHECK 168 static int ppsratecheck (struct timeval *, int *, int); 169 #endif 170 static struct mbuf *ni6_input (struct mbuf *, int); 171 static struct mbuf *ni6_nametodns (const char *, int, int); 172 static int ni6_dnsmatch (const char *, int, const char *, int); 173 static int ni6_addrs (struct icmp6_nodeinfo *, struct mbuf *, 174 struct ifnet **, char *); 175 static int ni6_store_addrs (struct icmp6_nodeinfo *, struct icmp6_nodeinfo *, 176 struct ifnet *, int); 177 static int icmp6_notify_error (struct mbuf *, int, int, int); 178 179 static void icmp6_fasttimo(void *); 180 static void icmp6_fasttimo_dispatch(netmsg_t); 181 182 #ifdef COMPAT_RFC1885 183 static struct route_in6 icmp6_reflect_rt; 184 #endif 185 186 static struct callout icmp6_fasttimo_ch; 187 static struct netmsg_base icmp6_fasttimo_nmsg; 188 189 void 190 icmp6_init(void) 191 { 192 193 mld6_init(); 194 195 callout_init_mp(&icmp6_fasttimo_ch); 196 netmsg_init(&icmp6_fasttimo_nmsg, NULL, &netisr_adone_rport, 197 MSGF_PRIORITY, icmp6_fasttimo_dispatch); 198 199 callout_reset_bycpu(&icmp6_fasttimo_ch, ICMP6_FASTTIMO, 200 icmp6_fasttimo, NULL, 0); 201 } 202 203 static void 204 icmp6_errcount(struct icmp6errstat *stat, int type, int code) 205 { 206 switch (type) { 207 case ICMP6_DST_UNREACH: 208 switch (code) { 209 case ICMP6_DST_UNREACH_NOROUTE: 210 stat->icp6errs_dst_unreach_noroute++; 211 return; 212 case ICMP6_DST_UNREACH_ADMIN: 213 stat->icp6errs_dst_unreach_admin++; 214 return; 215 case ICMP6_DST_UNREACH_BEYONDSCOPE: 216 stat->icp6errs_dst_unreach_beyondscope++; 217 return; 218 case ICMP6_DST_UNREACH_ADDR: 219 stat->icp6errs_dst_unreach_addr++; 220 return; 221 case ICMP6_DST_UNREACH_NOPORT: 222 stat->icp6errs_dst_unreach_noport++; 223 return; 224 } 225 break; 226 case ICMP6_PACKET_TOO_BIG: 227 stat->icp6errs_packet_too_big++; 228 return; 229 case ICMP6_TIME_EXCEEDED: 230 switch (code) { 231 case ICMP6_TIME_EXCEED_TRANSIT: 232 stat->icp6errs_time_exceed_transit++; 233 return; 234 case ICMP6_TIME_EXCEED_REASSEMBLY: 235 stat->icp6errs_time_exceed_reassembly++; 236 return; 237 } 238 break; 239 case ICMP6_PARAM_PROB: 240 switch (code) { 241 case ICMP6_PARAMPROB_HEADER: 242 stat->icp6errs_paramprob_header++; 243 return; 244 case ICMP6_PARAMPROB_NEXTHEADER: 245 stat->icp6errs_paramprob_nextheader++; 246 return; 247 case ICMP6_PARAMPROB_OPTION: 248 stat->icp6errs_paramprob_option++; 249 return; 250 } 251 break; 252 case ND_REDIRECT: 253 stat->icp6errs_redirect++; 254 return; 255 } 256 stat->icp6errs_unknown++; 257 } 258 259 /* 260 * Generate an error packet of type error in response to bad IP6 packet. 261 */ 262 void 263 icmp6_error(struct mbuf *m, int type, int code, int param) 264 { 265 struct ip6_hdr *oip6, *nip6; 266 struct icmp6_hdr *icmp6; 267 u_int preplen; 268 int off; 269 int nxt; 270 271 icmp6stat.icp6s_error++; 272 273 /* count per-type-code statistics */ 274 icmp6_errcount(&icmp6stat.icp6s_outerrhist, type, code); 275 276 #ifdef M_DECRYPTED /*not openbsd*/ 277 if (m->m_flags & M_DECRYPTED) { 278 icmp6stat.icp6s_canterror++; 279 goto freeit; 280 } 281 #endif 282 283 #ifndef PULLDOWN_TEST 284 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), ); 285 #else 286 if (m->m_len < sizeof(struct ip6_hdr)) { 287 m = m_pullup(m, sizeof(struct ip6_hdr)); 288 if (m == NULL) 289 return; 290 } 291 #endif 292 oip6 = mtod(m, struct ip6_hdr *); 293 294 /* 295 * Multicast destination check. For unrecognized option errors, 296 * this check has already done in ip6_unknown_opt(), so we can 297 * check only for other errors. 298 */ 299 if ((m->m_flags & (M_BCAST|M_MCAST) || 300 IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) && 301 (type != ICMP6_PACKET_TOO_BIG && 302 (type != ICMP6_PARAM_PROB || 303 code != ICMP6_PARAMPROB_OPTION))) 304 goto freeit; 305 306 /* Source address check. XXX: the case of anycast source? */ 307 if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) || 308 IN6_IS_ADDR_MULTICAST(&oip6->ip6_src)) 309 goto freeit; 310 311 /* 312 * If we are about to send ICMPv6 against ICMPv6 error/redirect, 313 * don't do it. 314 */ 315 nxt = -1; 316 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 317 if (off >= 0 && nxt == IPPROTO_ICMPV6) { 318 struct icmp6_hdr *icp; 319 320 #ifndef PULLDOWN_TEST 321 IP6_EXTHDR_CHECK(m, 0, off + sizeof(struct icmp6_hdr), ); 322 icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 323 #else 324 IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off, 325 sizeof(*icp)); 326 if (icp == NULL) { 327 icmp6stat.icp6s_tooshort++; 328 return; 329 } 330 #endif 331 if (icp->icmp6_type < ICMP6_ECHO_REQUEST || 332 icp->icmp6_type == ND_REDIRECT) { 333 /* 334 * ICMPv6 error 335 * Special case: for redirect (which is 336 * informational) we must not send icmp6 error. 337 */ 338 icmp6stat.icp6s_canterror++; 339 goto freeit; 340 } else { 341 /* ICMPv6 informational - send the error */ 342 } 343 } else { 344 /* non-ICMPv6 - send the error */ 345 } 346 347 oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */ 348 349 /* Finally, do rate limitation check. */ 350 if (icmp6_ratelimit(&oip6->ip6_src, type, code)) { 351 icmp6stat.icp6s_toofreq++; 352 goto freeit; 353 } 354 355 /* 356 * OK, ICMP6 can be generated. 357 */ 358 359 if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN) 360 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len); 361 362 preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 363 M_PREPEND(m, preplen, M_NOWAIT); 364 if (m && m->m_len < preplen) 365 m = m_pullup(m, preplen); 366 if (m == NULL) { 367 nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__)); 368 return; 369 } 370 371 nip6 = mtod(m, struct ip6_hdr *); 372 nip6->ip6_src = oip6->ip6_src; 373 nip6->ip6_dst = oip6->ip6_dst; 374 375 in6_clearscope(&oip6->ip6_src); 376 in6_clearscope(&oip6->ip6_dst); 377 378 icmp6 = (struct icmp6_hdr *)(nip6 + 1); 379 icmp6->icmp6_type = type; 380 icmp6->icmp6_code = code; 381 icmp6->icmp6_pptr = htonl((u_int32_t)param); 382 383 /* 384 * icmp6_reflect() is designed to be in the input path. 385 * icmp6_error() can be called from both input and outut path, 386 * and if we are in output path rcvif could contain bogus value. 387 * clear m->m_pkthdr.rcvif for safety, we should have enough scope 388 * information in ip header (nip6). 389 */ 390 m->m_pkthdr.rcvif = NULL; 391 392 icmp6stat.icp6s_outhist[type]++; 393 icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */ 394 395 return; 396 397 freeit: 398 /* 399 * If we can't tell wheter or not we can generate ICMP6, free it. 400 */ 401 m_freem(m); 402 } 403 404 /* 405 * Process a received ICMP6 message. 406 */ 407 int 408 icmp6_input(struct mbuf **mp, int *offp, int proto) 409 { 410 struct mbuf *m = *mp, *n; 411 struct ip6_hdr *ip6, *nip6; 412 struct icmp6_hdr *icmp6, *nicmp6; 413 int off = *offp; 414 int icmp6len = m->m_pkthdr.len - *offp; 415 int code, sum, noff; 416 417 #ifndef PULLDOWN_TEST 418 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr), IPPROTO_DONE); 419 /* m might change if M_LOOP. So, call mtod after this */ 420 #endif 421 422 /* 423 * Locate icmp6 structure in mbuf, and check 424 * that not corrupted and of at least minimum length 425 */ 426 427 ip6 = mtod(m, struct ip6_hdr *); 428 if (icmp6len < sizeof(struct icmp6_hdr)) { 429 icmp6stat.icp6s_tooshort++; 430 goto freeit; 431 } 432 433 /* 434 * calculate the checksum 435 */ 436 #ifndef PULLDOWN_TEST 437 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off); 438 #else 439 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 440 if (icmp6 == NULL) { 441 icmp6stat.icp6s_tooshort++; 442 return IPPROTO_DONE; 443 } 444 #endif 445 code = icmp6->icmp6_code; 446 447 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) { 448 nd6log((LOG_ERR, 449 "ICMP6 checksum error(%d|%x) %s\n", 450 icmp6->icmp6_type, sum, ip6_sprintf(&ip6->ip6_src))); 451 icmp6stat.icp6s_checksum++; 452 goto freeit; 453 } 454 455 if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) { 456 /* 457 * Deliver very specific ICMP6 type only. 458 * This is important to deilver TOOBIG. Otherwise PMTUD 459 * will not work. 460 */ 461 switch (icmp6->icmp6_type) { 462 case ICMP6_DST_UNREACH: 463 case ICMP6_PACKET_TOO_BIG: 464 case ICMP6_TIME_EXCEEDED: 465 break; 466 default: 467 goto freeit; 468 } 469 } 470 471 icmp6stat.icp6s_inhist[icmp6->icmp6_type]++; 472 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_msg); 473 if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK) 474 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error); 475 476 switch (icmp6->icmp6_type) { 477 case ICMP6_DST_UNREACH: 478 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_dstunreach); 479 switch (code) { 480 case ICMP6_DST_UNREACH_NOROUTE: 481 code = PRC_UNREACH_NET; 482 break; 483 case ICMP6_DST_UNREACH_ADMIN: 484 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_adminprohib); 485 code = PRC_UNREACH_PROTOCOL; /* is this a good code? */ 486 break; 487 case ICMP6_DST_UNREACH_ADDR: 488 code = PRC_HOSTDEAD; 489 break; 490 #ifdef COMPAT_RFC1885 491 case ICMP6_DST_UNREACH_NOTNEIGHBOR: 492 code = PRC_UNREACH_SRCFAIL; 493 break; 494 #else 495 case ICMP6_DST_UNREACH_BEYONDSCOPE: 496 /* I mean "source address was incorrect." */ 497 code = PRC_PARAMPROB; 498 break; 499 #endif 500 case ICMP6_DST_UNREACH_NOPORT: 501 code = PRC_UNREACH_PORT; 502 break; 503 default: 504 goto badcode; 505 } 506 goto deliver; 507 break; 508 509 case ICMP6_PACKET_TOO_BIG: 510 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_pkttoobig); 511 if (code != 0) 512 goto badcode; 513 514 code = PRC_MSGSIZE; 515 516 /* 517 * Updating the path MTU will be done after examining 518 * intermediate extension headers. 519 */ 520 goto deliver; 521 break; 522 523 case ICMP6_TIME_EXCEEDED: 524 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_timeexceed); 525 switch (code) { 526 case ICMP6_TIME_EXCEED_TRANSIT: 527 case ICMP6_TIME_EXCEED_REASSEMBLY: 528 code += PRC_TIMXCEED_INTRANS; 529 break; 530 default: 531 goto badcode; 532 } 533 goto deliver; 534 break; 535 536 case ICMP6_PARAM_PROB: 537 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_paramprob); 538 switch (code) { 539 case ICMP6_PARAMPROB_NEXTHEADER: 540 code = PRC_UNREACH_PROTOCOL; 541 break; 542 case ICMP6_PARAMPROB_HEADER: 543 case ICMP6_PARAMPROB_OPTION: 544 code = PRC_PARAMPROB; 545 break; 546 default: 547 goto badcode; 548 } 549 goto deliver; 550 break; 551 552 case ICMP6_ECHO_REQUEST: 553 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echo); 554 if (code != 0) 555 goto badcode; 556 if ((n = m_copy(m, 0, M_COPYALL)) == NULL) { 557 /* Give up remote */ 558 break; 559 } 560 if ((n->m_flags & M_EXT) || 561 n->m_len < off + sizeof(struct icmp6_hdr)) { 562 struct mbuf *n0 = n; 563 const int maxlen = sizeof(*nip6) + sizeof(*nicmp6); 564 int n0len; 565 566 /* 567 * Prepare an internal mbuf. m_pullup() doesn't 568 * always copy the length we specified. 569 */ 570 if (maxlen >= MCLBYTES) { 571 /* Give up remote */ 572 m_freem(n0); 573 break; 574 } 575 n = m_getb(maxlen, M_NOWAIT, n0->m_type, M_PKTHDR); 576 if (n == NULL) { 577 /* Give up remote */ 578 m_freem(n0); 579 break; 580 } 581 n0len = n0->m_pkthdr.len; /* save for use below */ 582 M_MOVE_PKTHDR(n, n0); 583 /* 584 * Copy IPv6 and ICMPv6 only. 585 */ 586 nip6 = mtod(n, struct ip6_hdr *); 587 bcopy(ip6, nip6, sizeof(struct ip6_hdr)); 588 nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 589 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); 590 noff = sizeof(struct ip6_hdr); 591 /* new mbuf contains only ipv6+icmpv6 headers */ 592 n->m_len = noff + sizeof(struct icmp6_hdr); 593 /* 594 * Adjust mbuf. ip6_plen will be adjusted in 595 * ip6_output(). 596 */ 597 m_adj(n0, off + sizeof(struct icmp6_hdr)); 598 /* recalculate complete packet size */ 599 n->m_pkthdr.len = n0len + (noff - off); 600 n->m_next = n0; 601 } else { 602 nip6 = mtod(n, struct ip6_hdr *); 603 nicmp6 = (struct icmp6_hdr *)((caddr_t)nip6 + off); 604 noff = off; 605 } 606 nicmp6->icmp6_type = ICMP6_ECHO_REPLY; 607 nicmp6->icmp6_code = 0; 608 if (n) { 609 icmp6stat.icp6s_reflect++; 610 icmp6stat.icp6s_outhist[ICMP6_ECHO_REPLY]++; 611 icmp6_reflect(n, noff); 612 } 613 break; 614 615 case ICMP6_ECHO_REPLY: 616 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echoreply); 617 if (code != 0) 618 goto badcode; 619 break; 620 621 case MLD_LISTENER_QUERY: 622 case MLD_LISTENER_REPORT: 623 if (icmp6len < sizeof(struct mld_hdr)) 624 goto badlen; 625 if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */ 626 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldquery); 627 else 628 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldreport); 629 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) { 630 /* give up local */ 631 mld6_input(m, off); 632 m = NULL; 633 goto freeit; 634 } 635 mld6_input(n, off); 636 /* m stays. */ 637 break; 638 639 case MLD_LISTENER_DONE: 640 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mlddone); 641 if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */ 642 goto badlen; 643 break; /* nothing to be done in kernel */ 644 645 case MLD_MTRACE_RESP: 646 case MLD_MTRACE: 647 /* XXX: these two are experimental. not officially defind. */ 648 /* XXX: per-interface statistics? */ 649 break; /* just pass it to applications */ 650 651 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */ 652 { 653 enum { WRU, FQDN } mode; 654 655 if (!icmp6_nodeinfo) 656 break; 657 658 if (icmp6len == sizeof(struct icmp6_hdr) + 4) 659 mode = WRU; 660 else if (icmp6len >= sizeof(struct icmp6_nodeinfo)) 661 mode = FQDN; 662 else 663 goto badlen; 664 665 #define hostnamelen strlen(hostname) 666 if (mode == FQDN) { 667 #ifndef PULLDOWN_TEST 668 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo), 669 IPPROTO_DONE); 670 #endif 671 n = m_copy(m, 0, M_COPYALL); 672 if (n) 673 n = ni6_input(n, off); 674 /* XXX meaningless if n == NULL */ 675 noff = sizeof(struct ip6_hdr); 676 } else { 677 u_char *p; 678 int maxlen, maxhlen; 679 680 if ((icmp6_nodeinfo & 5) != 5) 681 break; 682 683 if (code != 0) 684 goto badcode; 685 maxlen = sizeof(*nip6) + sizeof(*nicmp6) + 4; 686 if (maxlen >= MCLBYTES) { 687 /* Give up remote */ 688 break; 689 } 690 n = m_getb(maxlen, M_NOWAIT, m->m_type, M_PKTHDR); 691 if (n == NULL) { 692 /* Give up remote */ 693 break; 694 } 695 if (!m_dup_pkthdr(n, m, M_NOWAIT)) { 696 /* 697 * Previous code did a blind M_COPY_PKTHDR 698 * and said "just for rcvif". If true, then 699 * we could tolerate the dup failing (due to 700 * the deep copy of the tag chain). For now 701 * be conservative and just fail. 702 */ 703 m_free(n); 704 break; 705 } 706 n->m_len = 0; 707 maxhlen = M_TRAILINGSPACE(n) - maxlen; 708 if (maxhlen > hostnamelen) 709 maxhlen = hostnamelen; 710 /* 711 * Copy IPv6 and ICMPv6 only. 712 */ 713 nip6 = mtod(n, struct ip6_hdr *); 714 bcopy(ip6, nip6, sizeof(struct ip6_hdr)); 715 nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 716 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); 717 p = (u_char *)(nicmp6 + 1); 718 bzero(p, 4); 719 bcopy(hostname, p + 4, maxhlen); /* meaningless TTL */ 720 noff = sizeof(struct ip6_hdr); 721 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 722 sizeof(struct icmp6_hdr) + 4 + maxhlen; 723 nicmp6->icmp6_type = ICMP6_WRUREPLY; 724 nicmp6->icmp6_code = 0; 725 } 726 #undef hostnamelen 727 if (n) { 728 icmp6stat.icp6s_reflect++; 729 icmp6stat.icp6s_outhist[ICMP6_WRUREPLY]++; 730 icmp6_reflect(n, noff); 731 } 732 break; 733 } 734 735 case ICMP6_WRUREPLY: 736 if (code != 0) 737 goto badcode; 738 break; 739 740 case ND_ROUTER_SOLICIT: 741 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routersolicit); 742 if (code != 0) 743 goto badcode; 744 if (icmp6len < sizeof(struct nd_router_solicit)) 745 goto badlen; 746 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) { 747 /* give up local */ 748 nd6_rs_input(m, off, icmp6len); 749 m = NULL; 750 goto freeit; 751 } 752 nd6_rs_input(n, off, icmp6len); 753 /* m stays. */ 754 break; 755 756 case ND_ROUTER_ADVERT: 757 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routeradvert); 758 if (code != 0) 759 goto badcode; 760 if (icmp6len < sizeof(struct nd_router_advert)) 761 goto badlen; 762 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) { 763 /* give up local */ 764 nd6_ra_input(m, off, icmp6len); 765 m = NULL; 766 goto freeit; 767 } 768 nd6_ra_input(n, off, icmp6len); 769 /* m stays. */ 770 break; 771 772 case ND_NEIGHBOR_SOLICIT: 773 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighborsolicit); 774 if (code != 0) 775 goto badcode; 776 if (icmp6len < sizeof(struct nd_neighbor_solicit)) 777 goto badlen; 778 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) { 779 /* give up local */ 780 nd6_ns_input(m, off, icmp6len); 781 m = NULL; 782 goto freeit; 783 } 784 nd6_ns_input(n, off, icmp6len); 785 /* m stays. */ 786 break; 787 788 case ND_NEIGHBOR_ADVERT: 789 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighboradvert); 790 if (code != 0) 791 goto badcode; 792 if (icmp6len < sizeof(struct nd_neighbor_advert)) 793 goto badlen; 794 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) { 795 /* give up local */ 796 nd6_na_input(m, off, icmp6len); 797 m = NULL; 798 goto freeit; 799 } 800 nd6_na_input(n, off, icmp6len); 801 /* m stays. */ 802 break; 803 804 case ND_REDIRECT: 805 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_redirect); 806 if (code != 0) 807 goto badcode; 808 if (icmp6len < sizeof(struct nd_redirect)) 809 goto badlen; 810 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) { 811 /* give up local */ 812 icmp6_redirect_input(m, off); 813 m = NULL; 814 goto freeit; 815 } 816 icmp6_redirect_input(n, off); 817 /* m stays. */ 818 break; 819 820 case ICMP6_ROUTER_RENUMBERING: 821 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND && 822 code != ICMP6_ROUTER_RENUMBERING_RESULT) 823 goto badcode; 824 if (icmp6len < sizeof(struct icmp6_router_renum)) 825 goto badlen; 826 break; 827 828 default: 829 nd6log((LOG_DEBUG, 830 "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n", 831 icmp6->icmp6_type, ip6_sprintf(&ip6->ip6_src), 832 ip6_sprintf(&ip6->ip6_dst), 833 m->m_pkthdr.rcvif ? m->m_pkthdr.rcvif->if_index : 0)); 834 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) { 835 /* ICMPv6 error: MUST deliver it by spec... */ 836 code = PRC_NCMDS; 837 /* deliver */ 838 } else { 839 /* ICMPv6 informational: MUST not deliver */ 840 break; 841 } 842 deliver: 843 if (icmp6_notify_error(m, off, icmp6len, code)) { 844 /* In this case, m should've been freed. */ 845 return (IPPROTO_DONE); 846 } 847 break; 848 849 badcode: 850 icmp6stat.icp6s_badcode++; 851 break; 852 853 badlen: 854 icmp6stat.icp6s_badlen++; 855 break; 856 } 857 858 /* deliver the packet to appropriate sockets */ 859 icmp6_rip6_input(&m, *offp); 860 861 return IPPROTO_DONE; 862 863 freeit: 864 m_freem(m); 865 return IPPROTO_DONE; 866 } 867 868 static int 869 icmp6_notify_error(struct mbuf *m, int off, int icmp6len, int code) 870 { 871 struct icmp6_hdr *icmp6; 872 struct ip6_hdr *eip6; 873 u_int32_t notifymtu; 874 struct sockaddr_in6 icmp6src, icmp6dst; 875 876 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) { 877 icmp6stat.icp6s_tooshort++; 878 goto freeit; 879 } 880 #ifndef PULLDOWN_TEST 881 IP6_EXTHDR_CHECK(m, off, 882 sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr), 883 -1); 884 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 885 #else 886 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 887 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 888 if (icmp6 == NULL) { 889 icmp6stat.icp6s_tooshort++; 890 return (-1); 891 } 892 #endif 893 eip6 = (struct ip6_hdr *)(icmp6 + 1); 894 895 /* Detect the upper level protocol */ 896 { 897 u_int8_t nxt = eip6->ip6_nxt; 898 int eoff = off + sizeof(struct icmp6_hdr) + 899 sizeof(struct ip6_hdr); 900 struct ip6ctlparam ip6cp; 901 struct in6_addr *finaldst = NULL; 902 int icmp6type = icmp6->icmp6_type; 903 struct ip6_frag *fh; 904 struct ip6_rthdr *rth; 905 int rthlen; 906 907 while (1) { /* XXX: should avoid infinite loop explicitly? */ 908 struct ip6_ext *eh; 909 910 switch (nxt) { 911 case IPPROTO_HOPOPTS: 912 case IPPROTO_DSTOPTS: 913 case IPPROTO_AH: 914 #ifndef PULLDOWN_TEST 915 IP6_EXTHDR_CHECK(m, 0, 916 eoff + sizeof(struct ip6_ext), -1); 917 eh = (struct ip6_ext *) 918 (mtod(m, caddr_t) + eoff); 919 #else 920 IP6_EXTHDR_GET(eh, struct ip6_ext *, m, 921 eoff, sizeof(*eh)); 922 if (eh == NULL) { 923 icmp6stat.icp6s_tooshort++; 924 return (-1); 925 } 926 #endif 927 928 if (nxt == IPPROTO_AH) 929 eoff += (eh->ip6e_len + 2) << 2; 930 else 931 eoff += (eh->ip6e_len + 1) << 3; 932 nxt = eh->ip6e_nxt; 933 break; 934 case IPPROTO_ROUTING: 935 /* 936 * When the erroneous packet contains a 937 * routing header, we should examine the 938 * header to determine the final destination. 939 * Otherwise, we can't properly update 940 * information that depends on the final 941 * destination (e.g. path MTU). 942 */ 943 #ifndef PULLDOWN_TEST 944 IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(*rth), 945 -1); 946 rth = (struct ip6_rthdr *)(mtod(m, caddr_t) 947 + eoff); 948 #else 949 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m, 950 eoff, sizeof(*rth)); 951 if (rth == NULL) { 952 icmp6stat.icp6s_tooshort++; 953 return (-1); 954 } 955 #endif 956 rthlen = (rth->ip6r_len + 1) << 3; 957 eoff += rthlen; 958 nxt = rth->ip6r_nxt; 959 break; 960 case IPPROTO_FRAGMENT: 961 #ifndef PULLDOWN_TEST 962 IP6_EXTHDR_CHECK(m, 0, eoff + 963 sizeof(struct ip6_frag), 964 -1); 965 fh = (struct ip6_frag *)(mtod(m, caddr_t) 966 + eoff); 967 #else 968 IP6_EXTHDR_GET(fh, struct ip6_frag *, m, 969 eoff, sizeof(*fh)); 970 if (fh == NULL) { 971 icmp6stat.icp6s_tooshort++; 972 return (-1); 973 } 974 #endif 975 /* 976 * Data after a fragment header is meaningless 977 * unless it is the first fragment, but 978 * we'll go to the notify label for path MTU 979 * discovery. 980 */ 981 if (fh->ip6f_offlg & IP6F_OFF_MASK) 982 goto notify; 983 984 eoff += sizeof(struct ip6_frag); 985 nxt = fh->ip6f_nxt; 986 break; 987 default: 988 /* 989 * This case includes ESP and the No Next 990 * Header. In such cases going to the notify 991 * label does not have any meaning 992 * (i.e. pr_ctlinput will be NULL), but we go 993 * anyway since we might have to update 994 * path MTU information. 995 */ 996 goto notify; 997 } 998 } 999 notify: 1000 #ifndef PULLDOWN_TEST 1001 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 1002 #else 1003 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 1004 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 1005 if (icmp6 == NULL) { 1006 icmp6stat.icp6s_tooshort++; 1007 return (-1); 1008 } 1009 #endif 1010 1011 eip6 = (struct ip6_hdr *)(icmp6 + 1); 1012 bzero(&icmp6dst, sizeof(icmp6dst)); 1013 icmp6dst.sin6_len = sizeof(struct sockaddr_in6); 1014 icmp6dst.sin6_family = AF_INET6; 1015 if (finaldst == NULL) 1016 icmp6dst.sin6_addr = eip6->ip6_dst; 1017 else 1018 icmp6dst.sin6_addr = *finaldst; 1019 if (in6_addr2zoneid(m->m_pkthdr.rcvif, &icmp6dst.sin6_addr, 1020 &icmp6dst.sin6_scope_id)) 1021 goto freeit; 1022 if (in6_embedscope(&icmp6dst.sin6_addr, &icmp6dst, 1023 NULL, NULL)) { 1024 /* should be impossbile */ 1025 nd6log((LOG_DEBUG, 1026 "icmp6_notify_error: in6_embedscope failed\n")); 1027 goto freeit; 1028 } 1029 1030 /* 1031 * retrieve parameters from the inner IPv6 header, and convert 1032 * them into sockaddr structures. 1033 */ 1034 bzero(&icmp6src, sizeof(icmp6src)); 1035 icmp6src.sin6_len = sizeof(struct sockaddr_in6); 1036 icmp6src.sin6_family = AF_INET6; 1037 icmp6src.sin6_addr = eip6->ip6_src; 1038 if (in6_addr2zoneid(m->m_pkthdr.rcvif, &icmp6src.sin6_addr, 1039 &icmp6src.sin6_scope_id)) 1040 goto freeit; 1041 if (in6_embedscope(&icmp6src.sin6_addr, &icmp6src, 1042 NULL, NULL)) { 1043 /* should be impossbile */ 1044 nd6log((LOG_DEBUG, 1045 "icmp6_notify_error: in6_embedscope failed\n")); 1046 goto freeit; 1047 } 1048 icmp6src.sin6_flowinfo = 1049 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK); 1050 1051 if (finaldst == NULL) 1052 finaldst = &eip6->ip6_dst; 1053 ip6cp.ip6c_m = m; 1054 ip6cp.ip6c_icmp6 = icmp6; 1055 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1); 1056 ip6cp.ip6c_off = eoff; 1057 ip6cp.ip6c_finaldst = finaldst; 1058 ip6cp.ip6c_src = &icmp6src; 1059 ip6cp.ip6c_nxt = nxt; 1060 1061 if (icmp6type == ICMP6_PACKET_TOO_BIG) { 1062 notifymtu = ntohl(icmp6->icmp6_mtu); 1063 ip6cp.ip6c_cmdarg = (void *)¬ifymtu; 1064 icmp6_mtudisc_update(&ip6cp, 1); /*XXX*/ 1065 } 1066 1067 so_pr_ctlinput( 1068 &inet6sw[ip6_protox[nxt]], 1069 code, (struct sockaddr *)&icmp6dst, &ip6cp); 1070 } 1071 return (0); 1072 1073 freeit: 1074 m_freem(m); 1075 return (-1); 1076 } 1077 1078 void 1079 icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated) 1080 { 1081 struct in6_addr *dst = ip6cp->ip6c_finaldst; 1082 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6; 1083 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */ 1084 u_int mtu = ntohl(icmp6->icmp6_mtu); 1085 struct rtentry *rt = NULL; 1086 struct sockaddr_in6 sin6; 1087 1088 if (!validated) 1089 return; 1090 1091 bzero(&sin6, sizeof(sin6)); 1092 sin6.sin6_family = PF_INET6; 1093 sin6.sin6_len = sizeof(struct sockaddr_in6); 1094 sin6.sin6_addr = *dst; 1095 /* XXX normally, this won't happen */ 1096 if (IN6_IS_ADDR_LINKLOCAL(dst)) { 1097 sin6.sin6_addr.s6_addr16[1] = 1098 htons(m->m_pkthdr.rcvif->if_index); 1099 } 1100 /* sin6.sin6_scope_id = XXX: should be set if DST is a scoped addr */ 1101 rt = rtpurelookup((struct sockaddr *)&sin6); 1102 if (rt != NULL && (rt->rt_flags & RTF_HOST) && 1103 !(rt->rt_rmx.rmx_locks & RTV_MTU)) { 1104 if (mtu < IPV6_MMTU) { /* XXX */ 1105 rt->rt_rmx.rmx_locks |= RTV_MTU; 1106 } else if (mtu < rt->rt_ifp->if_mtu && 1107 rt->rt_rmx.rmx_mtu > mtu) { 1108 icmp6stat.icp6s_pmtuchg++; 1109 rt->rt_rmx.rmx_mtu = mtu; 1110 } 1111 } 1112 if (rt) 1113 --rt->rt_refcnt; 1114 } 1115 1116 /* 1117 * Process a Node Information Query packet, based on 1118 * draft-ietf-ipngwg-icmp-name-lookups-07. 1119 * 1120 * Spec incompatibilities: 1121 * - IPv6 Subject address handling 1122 * - IPv4 Subject address handling support missing 1123 * - Proxy reply (answer even if it's not for me) 1124 * - joins NI group address at in6_ifattach() time only, does not cope 1125 * with hostname changes by sethostname(3) 1126 */ 1127 #define hostnamelen strlen(hostname) 1128 static struct mbuf * 1129 ni6_input(struct mbuf *m, int off) 1130 { 1131 struct icmp6_nodeinfo *ni6, *nni6; 1132 struct mbuf *n = NULL; 1133 u_int16_t qtype; 1134 int subjlen; 1135 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1136 struct ni_reply_fqdn *fqdn; 1137 int addrs; /* for NI_QTYPE_NODEADDR */ 1138 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */ 1139 struct sockaddr_in6 sin6; /* double meaning; ip6_dst and subjectaddr */ 1140 struct sockaddr_in6 sin6_d; /* XXX: we should retrieve this from m_aux */ 1141 struct ip6_hdr *ip6; 1142 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */ 1143 char *subj = NULL; 1144 struct in6_ifaddr *ia6 = NULL; 1145 1146 ip6 = mtod(m, struct ip6_hdr *); 1147 #ifndef PULLDOWN_TEST 1148 ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off); 1149 #else 1150 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6)); 1151 if (ni6 == NULL) { 1152 /* m is already reclaimed */ 1153 return NULL; 1154 } 1155 #endif 1156 1157 /* 1158 * Validate IPv6 destination address. 1159 * 1160 * The Responder must discard the Query without further processing 1161 * unless it is one of the Responder's unicast or anycast addresses, or 1162 * a link-local scope multicast address which the Responder has joined. 1163 * [icmp-name-lookups-07, Section 4.] 1164 */ 1165 bzero(&sin6, sizeof(sin6)); 1166 sin6.sin6_family = AF_INET6; 1167 sin6.sin6_len = sizeof(struct sockaddr_in6); 1168 bcopy(&ip6->ip6_dst, &sin6.sin6_addr, sizeof(sin6.sin6_addr)); 1169 /* XXX scopeid */ 1170 if ((ia6 = (struct in6_ifaddr *)ifa_ifwithaddr((struct sockaddr *)&sin6)) != NULL) { 1171 /* unicast/anycast, fine */ 1172 if ((ia6->ia6_flags & IN6_IFF_TEMPORARY) && 1173 (icmp6_nodeinfo & 4) == 0) { 1174 nd6log((LOG_DEBUG, "ni6_input: ignore node info to " 1175 "a temporary address in %s:%d", 1176 __FILE__, __LINE__)); 1177 goto bad; 1178 } 1179 } else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr)) 1180 ; /* link-local multicast, fine */ 1181 else 1182 goto bad; 1183 1184 /* validate query Subject field. */ 1185 qtype = ntohs(ni6->ni_qtype); 1186 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo); 1187 switch (qtype) { 1188 case NI_QTYPE_NOOP: 1189 case NI_QTYPE_SUPTYPES: 1190 /* 07 draft */ 1191 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0) 1192 break; 1193 /* FALLTHROUGH */ 1194 case NI_QTYPE_FQDN: 1195 case NI_QTYPE_NODEADDR: 1196 switch (ni6->ni_code) { 1197 case ICMP6_NI_SUBJ_IPV6: 1198 #if ICMP6_NI_SUBJ_IPV6 != 0 1199 case 0: 1200 #endif 1201 /* 1202 * backward compatibility - try to accept 03 draft 1203 * format, where no Subject is present. 1204 */ 1205 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 && 1206 subjlen == 0) { 1207 oldfqdn++; 1208 break; 1209 } 1210 #if ICMP6_NI_SUBJ_IPV6 != 0 1211 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6) 1212 goto bad; 1213 #endif 1214 1215 if (subjlen != sizeof(sin6.sin6_addr)) 1216 goto bad; 1217 1218 /* 1219 * Validate Subject address. 1220 * 1221 * Not sure what exactly "address belongs to the node" 1222 * means in the spec, is it just unicast, or what? 1223 * 1224 * At this moment we consider Subject address as 1225 * "belong to the node" if the Subject address equals 1226 * to the IPv6 destination address; validation for 1227 * IPv6 destination address should have done enough 1228 * check for us. 1229 * 1230 * We do not do proxy at this moment. 1231 */ 1232 /* m_pulldown instead of copy? */ 1233 m_copydata(m, off + sizeof(struct icmp6_nodeinfo), 1234 subjlen, (caddr_t)&sin6.sin6_addr); 1235 if (in6_addr2zoneid(m->m_pkthdr.rcvif, 1236 &sin6.sin6_addr, &sin6.sin6_scope_id)) 1237 goto bad; 1238 in6_embedscope(&sin6.sin6_addr, &sin6, NULL, NULL); 1239 bzero(&sin6_d, sizeof(sin6_d)); 1240 sin6_d.sin6_family = AF_INET6; /* not used, actually */ 1241 sin6_d.sin6_len = sizeof(sin6_d); /* ditto */ 1242 sin6_d.sin6_addr = ip6->ip6_dst; 1243 if (in6_addr2zoneid(m->m_pkthdr.rcvif, 1244 &ip6->ip6_dst, &sin6_d.sin6_scope_id)) 1245 goto bad; 1246 in6_embedscope(&sin6_d.sin6_addr, &sin6_d, NULL, NULL); 1247 subj = (char *)&sin6; 1248 if (SA6_ARE_ADDR_EQUAL(&sin6, &sin6_d)) 1249 break; 1250 1251 /* 1252 * XXX if we are to allow other cases, we should really 1253 * be careful about scope here. 1254 * basically, we should disallow queries toward IPv6 1255 * destination X with subject Y, if scope(X) > scope(Y). 1256 * if we allow scope(X) > scope(Y), it will result in 1257 * information leakage across scope boundary. 1258 */ 1259 goto bad; 1260 1261 case ICMP6_NI_SUBJ_FQDN: 1262 /* 1263 * Validate Subject name with gethostname(3). 1264 * 1265 * The behavior may need some debate, since: 1266 * - we are not sure if the node has FQDN as 1267 * hostname (returned by gethostname(3)). 1268 * - the code does wildcard match for truncated names. 1269 * however, we are not sure if we want to perform 1270 * wildcard match, if gethostname(3) side has 1271 * truncated hostname. 1272 */ 1273 n = ni6_nametodns(hostname, hostnamelen, 0); 1274 if (!n || n->m_next || n->m_len == 0) 1275 goto bad; 1276 IP6_EXTHDR_GET(subj, char *, m, 1277 off + sizeof(struct icmp6_nodeinfo), subjlen); 1278 if (subj == NULL) 1279 goto bad; 1280 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *), 1281 n->m_len)) { 1282 goto bad; 1283 } 1284 m_freem(n); 1285 n = NULL; 1286 break; 1287 1288 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */ 1289 default: 1290 goto bad; 1291 } 1292 break; 1293 } 1294 1295 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */ 1296 switch (qtype) { 1297 case NI_QTYPE_FQDN: 1298 if ((icmp6_nodeinfo & 1) == 0) 1299 goto bad; 1300 break; 1301 case NI_QTYPE_NODEADDR: 1302 if ((icmp6_nodeinfo & 2) == 0) 1303 goto bad; 1304 break; 1305 } 1306 1307 /* guess reply length */ 1308 switch (qtype) { 1309 case NI_QTYPE_NOOP: 1310 break; /* no reply data */ 1311 case NI_QTYPE_SUPTYPES: 1312 replylen += sizeof(u_int32_t); 1313 break; 1314 case NI_QTYPE_FQDN: 1315 /* XXX will append an mbuf */ 1316 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1317 break; 1318 case NI_QTYPE_NODEADDR: 1319 addrs = ni6_addrs(ni6, m, &ifp, subj); 1320 if ((replylen += addrs * (sizeof(struct in6_addr) + 1321 sizeof(u_int32_t))) > MCLBYTES) 1322 replylen = MCLBYTES; /* XXX: will truncate pkt later */ 1323 break; 1324 default: 1325 /* 1326 * XXX: We must return a reply with the ICMP6 code 1327 * `unknown Qtype' in this case. However we regard the case 1328 * as an FQDN query for backward compatibility. 1329 * Older versions set a random value to this field, 1330 * so it rarely varies in the defined qtypes. 1331 * But the mechanism is not reliable... 1332 * maybe we should obsolete older versions. 1333 */ 1334 qtype = NI_QTYPE_FQDN; 1335 /* XXX will append an mbuf */ 1336 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1337 oldfqdn++; 1338 break; 1339 } 1340 1341 /* allocate an mbuf to reply. */ 1342 if (replylen > MCLBYTES) { 1343 /* 1344 * XXX: should we try to allocate more? But MCLBYTES 1345 * is probably much larger than IPV6_MMTU... 1346 */ 1347 goto bad; 1348 } 1349 n = m_getb(replylen, M_NOWAIT, m->m_type, M_PKTHDR); 1350 if (n == NULL) { 1351 m_freem(m); 1352 return (NULL); 1353 } 1354 M_MOVE_PKTHDR(n, m); /* just for recvif */ 1355 n->m_pkthdr.len = n->m_len = replylen; 1356 1357 /* copy mbuf header and IPv6 + Node Information base headers */ 1358 bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr)); 1359 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1); 1360 bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo)); 1361 1362 /* qtype dependent procedure */ 1363 switch (qtype) { 1364 case NI_QTYPE_NOOP: 1365 nni6->ni_code = ICMP6_NI_SUCCESS; 1366 nni6->ni_flags = 0; 1367 break; 1368 case NI_QTYPE_SUPTYPES: 1369 { 1370 u_int32_t v; 1371 nni6->ni_code = ICMP6_NI_SUCCESS; 1372 nni6->ni_flags = htons(0x0000); /* raw bitmap */ 1373 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */ 1374 v = (u_int32_t)htonl(0x0000000f); 1375 bcopy(&v, nni6 + 1, sizeof(u_int32_t)); 1376 break; 1377 } 1378 case NI_QTYPE_FQDN: 1379 nni6->ni_code = ICMP6_NI_SUCCESS; 1380 fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) + 1381 sizeof(struct ip6_hdr) + 1382 sizeof(struct icmp6_nodeinfo)); 1383 nni6->ni_flags = 0; /* XXX: meaningless TTL */ 1384 fqdn->ni_fqdn_ttl = 0; /* ditto. */ 1385 /* 1386 * XXX do we really have FQDN in variable "hostname"? 1387 */ 1388 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn); 1389 if (n->m_next == NULL) 1390 goto bad; 1391 /* XXX we assume that n->m_next is not a chain */ 1392 if (n->m_next->m_next != NULL) 1393 goto bad; 1394 n->m_pkthdr.len += n->m_next->m_len; 1395 break; 1396 case NI_QTYPE_NODEADDR: 1397 { 1398 int lenlim, copied; 1399 1400 nni6->ni_code = ICMP6_NI_SUCCESS; 1401 n->m_pkthdr.len = n->m_len = 1402 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1403 lenlim = M_TRAILINGSPACE(n); 1404 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim); 1405 /* XXX: reset mbuf length */ 1406 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 1407 sizeof(struct icmp6_nodeinfo) + copied; 1408 break; 1409 } 1410 default: 1411 break; /* XXX impossible! */ 1412 } 1413 1414 nni6->ni_type = ICMP6_NI_REPLY; 1415 m_freem(m); 1416 return (n); 1417 1418 bad: 1419 m_freem(m); 1420 if (n) 1421 m_freem(n); 1422 return (NULL); 1423 } 1424 #undef hostnamelen 1425 1426 /* 1427 * make a mbuf with DNS-encoded string. no compression support. 1428 * 1429 * XXX names with less than 2 dots (like "foo" or "foo.section") will be 1430 * treated as truncated name (two \0 at the end). this is a wild guess. 1431 */ 1432 static struct mbuf * 1433 ni6_nametodns(const char *name, int namelen, 1434 int old) /* return pascal string if non-zero */ 1435 { 1436 struct mbuf *m; 1437 char *cp, *ep; 1438 const char *p, *q; 1439 int i, len, nterm; 1440 1441 if (old) 1442 len = namelen + 1; 1443 else 1444 len = MCLBYTES; 1445 1446 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */ 1447 m = m_getb(len, M_NOWAIT, MT_DATA, 0); 1448 if (!m) 1449 goto fail; 1450 1451 if (old) { 1452 m->m_len = len; 1453 *mtod(m, char *) = namelen; 1454 bcopy(name, mtod(m, char *) + 1, namelen); 1455 return m; 1456 } else { 1457 m->m_len = 0; 1458 cp = mtod(m, char *); 1459 ep = mtod(m, char *) + M_TRAILINGSPACE(m); 1460 1461 /* if not certain about my name, return empty buffer */ 1462 if (namelen == 0) 1463 return m; 1464 1465 /* 1466 * guess if it looks like shortened hostname, or FQDN. 1467 * shortened hostname needs two trailing "\0". 1468 */ 1469 i = 0; 1470 for (p = name; p < name + namelen; p++) { 1471 if (*p && *p == '.') 1472 i++; 1473 } 1474 if (i < 2) 1475 nterm = 2; 1476 else 1477 nterm = 1; 1478 1479 p = name; 1480 while (cp < ep && p < name + namelen) { 1481 i = 0; 1482 for (q = p; q < name + namelen && *q && *q != '.'; q++) 1483 i++; 1484 /* result does not fit into mbuf */ 1485 if (cp + i + 1 >= ep) 1486 goto fail; 1487 /* 1488 * DNS label length restriction, RFC1035 page 8. 1489 * "i == 0" case is included here to avoid returning 1490 * 0-length label on "foo..bar". 1491 */ 1492 if (i <= 0 || i >= 64) 1493 goto fail; 1494 *cp++ = i; 1495 bcopy(p, cp, i); 1496 cp += i; 1497 p = q; 1498 if (p < name + namelen && *p == '.') 1499 p++; 1500 } 1501 /* termination */ 1502 if (cp + nterm >= ep) 1503 goto fail; 1504 while (nterm-- > 0) 1505 *cp++ = '\0'; 1506 m->m_len = cp - mtod(m, char *); 1507 return m; 1508 } 1509 1510 panic("should not reach here"); 1511 /* NOTREACHED */ 1512 1513 fail: 1514 if (m) 1515 m_freem(m); 1516 return NULL; 1517 } 1518 1519 /* 1520 * check if two DNS-encoded string matches. takes care of truncated 1521 * form (with \0\0 at the end). no compression support. 1522 * XXX upper/lowercase match (see RFC2065) 1523 */ 1524 static int 1525 ni6_dnsmatch(const char *a, int alen, const char *b, int blen) 1526 { 1527 const char *a0, *b0; 1528 int l; 1529 1530 /* simplest case - need validation? */ 1531 if (alen == blen && bcmp(a, b, alen) == 0) 1532 return 1; 1533 1534 a0 = a; 1535 b0 = b; 1536 1537 /* termination is mandatory */ 1538 if (alen < 2 || blen < 2) 1539 return 0; 1540 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0') 1541 return 0; 1542 alen--; 1543 blen--; 1544 1545 while (a - a0 < alen && b - b0 < blen) { 1546 if (a - a0 + 1 > alen || b - b0 + 1 > blen) 1547 return 0; 1548 1549 if ((signed char)a[0] < 0 || (signed char)b[0] < 0) 1550 return 0; 1551 /* we don't support compression yet */ 1552 if (a[0] >= 64 || b[0] >= 64) 1553 return 0; 1554 1555 /* truncated case */ 1556 if (a[0] == 0 && a - a0 == alen - 1) 1557 return 1; 1558 if (b[0] == 0 && b - b0 == blen - 1) 1559 return 1; 1560 if (a[0] == 0 || b[0] == 0) 1561 return 0; 1562 1563 if (a[0] != b[0]) 1564 return 0; 1565 l = a[0]; 1566 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen) 1567 return 0; 1568 if (bcmp(a + 1, b + 1, l) != 0) 1569 return 0; 1570 1571 a += 1 + l; 1572 b += 1 + l; 1573 } 1574 1575 if (a - a0 == alen && b - b0 == blen) 1576 return 1; 1577 else 1578 return 0; 1579 } 1580 1581 /* 1582 * calculate the number of addresses to be returned in the node info reply. 1583 */ 1584 static int 1585 ni6_addrs(struct icmp6_nodeinfo *ni6, struct mbuf *m, struct ifnet **ifpp, 1586 char *subj) 1587 { 1588 const struct ifnet_array *arr; 1589 struct in6_ifaddr *ifa6; 1590 struct sockaddr_in6 *subj_ip6 = NULL; /* XXX pedant */ 1591 int addrs = 0, addrsofif, iffound = 0; 1592 int niflags = ni6->ni_flags; 1593 int i; 1594 1595 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) { 1596 switch (ni6->ni_code) { 1597 case ICMP6_NI_SUBJ_IPV6: 1598 if (subj == NULL) /* must be impossible... */ 1599 return (0); 1600 subj_ip6 = (struct sockaddr_in6 *)subj; 1601 break; 1602 default: 1603 /* 1604 * XXX: we only support IPv6 subject address for 1605 * this Qtype. 1606 */ 1607 return (0); 1608 } 1609 } 1610 1611 arr = ifnet_array_get(); 1612 for (i = 0; i < arr->ifnet_count; ++i) { 1613 struct ifnet *ifp = arr->ifnet_arr[i]; 1614 struct ifaddr_container *ifac; 1615 1616 addrsofif = 0; 1617 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) 1618 { 1619 struct ifaddr *ifa = ifac->ifa; 1620 1621 if (ifa->ifa_addr->sa_family != AF_INET6) 1622 continue; 1623 ifa6 = (struct in6_ifaddr *)ifa; 1624 1625 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 && 1626 IN6_ARE_ADDR_EQUAL(&subj_ip6->sin6_addr, 1627 &ifa6->ia_addr.sin6_addr)) 1628 iffound = 1; 1629 1630 /* 1631 * IPv4-mapped addresses can only be returned by a 1632 * Node Information proxy, since they represent 1633 * addresses of IPv4-only nodes, which perforce do 1634 * not implement this protocol. 1635 * [icmp-name-lookups-07, Section 5.4] 1636 * So we don't support NI_NODEADDR_FLAG_COMPAT in 1637 * this function at this moment. 1638 */ 1639 1640 /* What do we have to do about ::1? */ 1641 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) { 1642 case IPV6_ADDR_SCOPE_LINKLOCAL: 1643 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1644 continue; 1645 break; 1646 case IPV6_ADDR_SCOPE_SITELOCAL: 1647 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1648 continue; 1649 break; 1650 case IPV6_ADDR_SCOPE_GLOBAL: 1651 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1652 continue; 1653 break; 1654 default: 1655 continue; 1656 } 1657 1658 /* 1659 * check if anycast is okay. 1660 * XXX: just experimental. not in the spec. 1661 */ 1662 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) && 1663 !(niflags & NI_NODEADDR_FLAG_ANYCAST)) 1664 continue; /* we need only unicast addresses */ 1665 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) && 1666 (icmp6_nodeinfo & 4) == 0) { 1667 continue; 1668 } 1669 addrsofif++; /* count the address */ 1670 } 1671 if (iffound) { 1672 *ifpp = ifp; 1673 return (addrsofif); 1674 } 1675 1676 addrs += addrsofif; 1677 } 1678 1679 return (addrs); 1680 } 1681 1682 static int 1683 ni6_store_addrs(struct icmp6_nodeinfo *ni6, struct icmp6_nodeinfo *nni6, 1684 struct ifnet *ifp0, int resid) 1685 { 1686 const struct ifnet_array *arr; 1687 struct in6_ifaddr *ifa6; 1688 int copied = 0, allow_deprecated = 0; 1689 u_char *cp = (u_char *)(nni6 + 1); 1690 int niflags = ni6->ni_flags; 1691 u_int32_t ltime; 1692 int idx, idx_dep = -1; 1693 1694 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL)) 1695 return (0); /* needless to copy */ 1696 1697 arr = ifnet_array_get(); 1698 if (ifp0 == NULL) { 1699 idx = 0; 1700 } else { 1701 for (idx = 0; idx < arr->ifnet_count; ++idx) { 1702 if (arr->ifnet_arr[idx] == ifp0) 1703 break; 1704 } 1705 } 1706 1707 again: 1708 1709 for (; idx < arr->ifnet_count; ++idx) { 1710 struct ifnet *ifp = arr->ifnet_arr[idx]; 1711 struct ifaddr_container *ifac; 1712 1713 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 1714 struct ifaddr *ifa = ifac->ifa; 1715 1716 if (ifa->ifa_addr->sa_family != AF_INET6) 1717 continue; 1718 ifa6 = (struct in6_ifaddr *)ifa; 1719 1720 if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) && 1721 allow_deprecated == 0) { 1722 /* 1723 * prefererred address should be put before 1724 * deprecated addresses. 1725 */ 1726 1727 /* record the interface for later search */ 1728 if (idx_dep < 0) 1729 idx_dep = idx; 1730 1731 continue; 1732 } 1733 else if (!(ifa6->ia6_flags & IN6_IFF_DEPRECATED) && 1734 allow_deprecated != 0) 1735 continue; /* we now collect deprecated addrs */ 1736 1737 /* What do we have to do about ::1? */ 1738 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) { 1739 case IPV6_ADDR_SCOPE_LINKLOCAL: 1740 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0) 1741 continue; 1742 break; 1743 case IPV6_ADDR_SCOPE_SITELOCAL: 1744 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0) 1745 continue; 1746 break; 1747 case IPV6_ADDR_SCOPE_GLOBAL: 1748 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0) 1749 continue; 1750 break; 1751 default: 1752 continue; 1753 } 1754 1755 /* 1756 * check if anycast is okay. 1757 * XXX: just experimental. not in the spec. 1758 */ 1759 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) && 1760 !(niflags & NI_NODEADDR_FLAG_ANYCAST)) 1761 continue; 1762 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) && 1763 (icmp6_nodeinfo & 4) == 0) { 1764 continue; 1765 } 1766 1767 /* now we can copy the address */ 1768 if (resid < sizeof(struct in6_addr) + 1769 sizeof(u_int32_t)) { 1770 /* 1771 * We give up much more copy. 1772 * Set the truncate flag and return. 1773 */ 1774 nni6->ni_flags |= 1775 NI_NODEADDR_FLAG_TRUNCATE; 1776 return (copied); 1777 } 1778 1779 /* 1780 * Set the TTL of the address. 1781 * The TTL value should be one of the following 1782 * according to the specification: 1783 * 1784 * 1. The remaining lifetime of a DHCP lease on the 1785 * address, or 1786 * 2. The remaining Valid Lifetime of a prefix from 1787 * which the address was derived through Stateless 1788 * Autoconfiguration. 1789 * 1790 * Note that we currently do not support stateful 1791 * address configuration by DHCPv6, so the former 1792 * case can't happen. 1793 */ 1794 if (ifa6->ia6_lifetime.ia6t_expire == 0) 1795 ltime = ND6_INFINITE_LIFETIME; 1796 else { 1797 if (ifa6->ia6_lifetime.ia6t_expire > 1798 time_uptime) 1799 ltime = htonl(ifa6->ia6_lifetime.ia6t_expire - time_uptime); 1800 else 1801 ltime = 0; 1802 } 1803 1804 bcopy(<ime, cp, sizeof(u_int32_t)); 1805 cp += sizeof(u_int32_t); 1806 1807 /* copy the address itself */ 1808 bcopy(&ifa6->ia_addr.sin6_addr, cp, 1809 sizeof(struct in6_addr)); 1810 in6_clearscope((struct in6_addr *)cp); /* XXX */ 1811 cp += sizeof(struct in6_addr); 1812 1813 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t)); 1814 copied += (sizeof(struct in6_addr) + 1815 sizeof(u_int32_t)); 1816 } 1817 if (ifp0) /* we need search only on the specified IF */ 1818 break; 1819 } 1820 1821 if (allow_deprecated == 0 && idx_dep >= 0) { 1822 idx = idx_dep; 1823 allow_deprecated = 1; 1824 1825 goto again; 1826 } 1827 1828 return (copied); 1829 } 1830 1831 /* 1832 * XXX almost dup'ed code with rip6_input. 1833 */ 1834 static int 1835 icmp6_rip6_input(struct mbuf **mp, int off) 1836 { 1837 struct mbuf *m = *mp; 1838 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1839 struct in6pcb *in6p; 1840 struct in6pcb *last = NULL; 1841 struct sockaddr_in6 fromsa; 1842 struct icmp6_hdr *icmp6; 1843 struct mbuf *opts = NULL; 1844 1845 #ifndef PULLDOWN_TEST 1846 /* this is assumed to be safe. */ 1847 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off); 1848 #else 1849 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 1850 if (icmp6 == NULL) { 1851 /* m is already reclaimed */ 1852 return IPPROTO_DONE; 1853 } 1854 #endif 1855 1856 bzero(&fromsa, sizeof(fromsa)); 1857 fromsa.sin6_len = sizeof(struct sockaddr_in6); 1858 fromsa.sin6_family = AF_INET6; 1859 /* KAME hack: recover scopeid */ 1860 in6_recoverscope(&fromsa, &ip6->ip6_src, m->m_pkthdr.rcvif); 1861 1862 LIST_FOREACH(in6p, &ripcbinfo.pcblisthead, inp_list) 1863 { 1864 if (in6p->inp_flags & INP_PLACEMARKER) 1865 continue; 1866 if (!INP_ISIPV6(in6p)) 1867 continue; 1868 if (in6p->in6p_ip6_nxt != IPPROTO_ICMPV6) 1869 continue; 1870 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && 1871 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst)) 1872 continue; 1873 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) && 1874 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src)) 1875 continue; 1876 if (in6p->in6p_icmp6filt 1877 && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type, 1878 in6p->in6p_icmp6filt)) 1879 continue; 1880 if (last) { 1881 struct socket *so; 1882 struct mbuf *n; 1883 1884 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { 1885 if (last->in6p_flags & IN6P_CONTROLOPTS) 1886 ip6_savecontrol(last, &opts, ip6, n); 1887 /* strip intermediate headers */ 1888 m_adj(n, off); 1889 so = last->in6p_socket; 1890 lwkt_gettoken(&so->so_rcv.ssb_token); 1891 if (ssb_appendaddr(&so->so_rcv, 1892 (struct sockaddr *)&fromsa, n, opts) == 0) { 1893 /* should notify about lost packet */ 1894 m_freem(n); 1895 if (opts) 1896 m_freem(opts); 1897 } else { 1898 sorwakeup(so); 1899 } 1900 lwkt_reltoken(&so->so_rcv.ssb_token); 1901 opts = NULL; 1902 } 1903 } 1904 last = in6p; 1905 } 1906 if (last) { 1907 struct socket *so; 1908 1909 if (last->in6p_flags & IN6P_CONTROLOPTS) 1910 ip6_savecontrol(last, &opts, ip6, m); 1911 /* strip intermediate headers */ 1912 m_adj(m, off); 1913 so = last->in6p_socket; 1914 lwkt_gettoken(&so->so_rcv.ssb_token); 1915 if (ssb_appendaddr(&so->so_rcv, (struct sockaddr *)&fromsa, 1916 m, opts) == 0) { 1917 m_freem(m); 1918 if (opts) 1919 m_freem(opts); 1920 } else { 1921 sorwakeup(so); 1922 } 1923 lwkt_reltoken(&so->so_rcv.ssb_token); 1924 } else { 1925 m_freem(m); 1926 ip6stat.ip6s_delivered--; 1927 } 1928 return IPPROTO_DONE; 1929 } 1930 1931 /* 1932 * Reflect the ip6 packet back to the source. 1933 * OFF points to the icmp6 header, counted from the top of the mbuf. 1934 */ 1935 void 1936 icmp6_reflect(struct mbuf *m, size_t off) 1937 { 1938 struct ip6_hdr *ip6; 1939 struct icmp6_hdr *icmp6; 1940 struct in6_ifaddr *ia; 1941 struct in6_addr t, *src = NULL; 1942 int plen; 1943 int type, code; 1944 struct ifnet *outif = NULL; 1945 struct sockaddr_in6 sa6_src, sa6_dst; 1946 #ifdef COMPAT_RFC1885 1947 int mtu = IPV6_MMTU; 1948 struct sockaddr_in6 *sin6 = &icmp6_reflect_rt.ro_dst; 1949 #endif 1950 1951 /* too short to reflect */ 1952 if (off < sizeof(struct ip6_hdr)) { 1953 nd6log((LOG_DEBUG, 1954 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n", 1955 (u_long)off, (u_long)sizeof(struct ip6_hdr), 1956 __FILE__, __LINE__)); 1957 goto bad; 1958 } 1959 1960 /* 1961 * If there are extra headers between IPv6 and ICMPv6, strip 1962 * off that header first. 1963 */ 1964 #ifdef DIAGNOSTIC 1965 if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN) 1966 panic("assumption failed in icmp6_reflect"); 1967 #endif 1968 if (off > sizeof(struct ip6_hdr)) { 1969 size_t l; 1970 struct ip6_hdr nip6; 1971 1972 l = off - sizeof(struct ip6_hdr); 1973 m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6); 1974 m_adj(m, l); 1975 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 1976 if (m->m_len < l) { 1977 if ((m = m_pullup(m, l)) == NULL) 1978 return; 1979 } 1980 bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6)); 1981 } else /* off == sizeof(struct ip6_hdr) */ { 1982 size_t l; 1983 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 1984 if (m->m_len < l) { 1985 if ((m = m_pullup(m, l)) == NULL) 1986 return; 1987 } 1988 } 1989 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr); 1990 ip6 = mtod(m, struct ip6_hdr *); 1991 ip6->ip6_nxt = IPPROTO_ICMPV6; 1992 icmp6 = (struct icmp6_hdr *)(ip6 + 1); 1993 type = icmp6->icmp6_type; /* keep type for statistics */ 1994 code = icmp6->icmp6_code; /* ditto. */ 1995 1996 t = ip6->ip6_dst; 1997 /* 1998 * ip6_input() drops a packet if its src is multicast. 1999 * So, the src is never multicast. 2000 */ 2001 ip6->ip6_dst = ip6->ip6_src; 2002 2003 /* 2004 * XXX: make sure to embed scope zone information, using 2005 * already embedded IDs or the received interface (if any). 2006 * Note that rcvif may be NULL. 2007 * TODO: scoped routing case (XXX). 2008 */ 2009 bzero(&sa6_src, sizeof(sa6_src)); 2010 sa6_src.sin6_family = AF_INET6; 2011 sa6_src.sin6_len = sizeof(sa6_src); 2012 sa6_src.sin6_addr = ip6->ip6_dst; 2013 in6_recoverscope(&sa6_src, &ip6->ip6_dst, m->m_pkthdr.rcvif); 2014 in6_embedscope(&ip6->ip6_dst, &sa6_src, NULL, NULL); 2015 bzero(&sa6_dst, sizeof(sa6_dst)); 2016 sa6_dst.sin6_family = AF_INET6; 2017 sa6_dst.sin6_len = sizeof(sa6_dst); 2018 sa6_dst.sin6_addr = t; 2019 in6_recoverscope(&sa6_dst, &t, m->m_pkthdr.rcvif); 2020 in6_embedscope(&t, &sa6_dst, NULL, NULL); 2021 2022 #ifdef COMPAT_RFC1885 2023 /* 2024 * xxx guess MTU 2025 * RFC 1885 requires that echo reply should be truncated if it 2026 * does not fit in with (return) path MTU, but the description was 2027 * removed in the new spec. 2028 */ 2029 if (icmp6_reflect_rt.ro_rt == 0 || 2030 ! (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &ip6->ip6_dst))) { 2031 if (icmp6_reflect_rt.ro_rt) { 2032 RTFREE(icmp6_reflect_rt.ro_rt); 2033 icmp6_reflect_rt.ro_rt = 0; 2034 } 2035 bzero(sin6, sizeof(*sin6)); 2036 sin6->sin6_family = PF_INET6; 2037 sin6->sin6_len = sizeof(struct sockaddr_in6); 2038 sin6->sin6_addr = ip6->ip6_dst; 2039 2040 rtalloc_ign((struct route *)&icmp6_reflect_rt.ro_rt, 2041 RTF_PRCLONING); 2042 } 2043 2044 if (icmp6_reflect_rt.ro_rt == 0) 2045 goto bad; 2046 2047 if ((icmp6_reflect_rt.ro_rt->rt_flags & RTF_HOST) 2048 && mtu < icmp6_reflect_rt.ro_rt->rt_ifp->if_mtu) 2049 mtu = icmp6_reflect_rt.ro_rt->rt_rmx.rmx_mtu; 2050 2051 if (mtu < m->m_pkthdr.len) { 2052 plen -= (m->m_pkthdr.len - mtu); 2053 m_adj(m, mtu - m->m_pkthdr.len); 2054 } 2055 #endif 2056 /* 2057 * If the incoming packet was addressed directly to us(i.e. unicast), 2058 * use dst as the src for the reply. 2059 * The IN6_IFF_NOTREADY case would be VERY rare, but is possible 2060 * (for example) when we encounter an error while forwarding procedure 2061 * destined to a duplicated address of ours. 2062 */ 2063 for (ia = in6_ifaddr; ia; ia = ia->ia_next) 2064 if (IN6_ARE_ADDR_EQUAL(&t, &ia->ia_addr.sin6_addr) && 2065 (ia->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) { 2066 src = &t; 2067 break; 2068 } 2069 if (ia == NULL && IN6_IS_ADDR_LINKLOCAL(&t) && (m->m_flags & M_LOOP)) { 2070 /* 2071 * This is the case if the dst is our link-local address 2072 * and the sender is also ourselves. 2073 */ 2074 src = &t; 2075 } 2076 2077 if (src == NULL) { 2078 int e; 2079 struct route_in6 ro; 2080 2081 /* 2082 * This case matches to multicasts, our anycast, or unicasts 2083 * that we do not own. Select a source address based on the 2084 * source address of the erroneous packet. 2085 */ 2086 bzero(&ro, sizeof(ro)); 2087 src = in6_selectsrc(&sa6_src, NULL, NULL, &ro, NULL, &e, NULL); 2088 if (ro.ro_rt) 2089 RTFREE(ro.ro_rt); /* XXX: we could use this */ 2090 if (src == NULL) { 2091 nd6log((LOG_DEBUG, 2092 "icmp6_reflect: source can't be determined: " 2093 "dst=%s, error=%d\n", 2094 ip6_sprintf(&sa6_src.sin6_addr), e)); 2095 goto bad; 2096 } 2097 } 2098 2099 ip6->ip6_src = *src; 2100 2101 ip6->ip6_flow = 0; 2102 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2103 ip6->ip6_vfc |= IPV6_VERSION; 2104 ip6->ip6_nxt = IPPROTO_ICMPV6; 2105 if (m->m_pkthdr.rcvif) { 2106 /* XXX: This may not be the outgoing interface */ 2107 ip6->ip6_hlim = ND_IFINFO(m->m_pkthdr.rcvif)->chlim; 2108 if (ip6->ip6_hlim < ip6_minhlim) 2109 ip6->ip6_hlim = ip6_minhlim; 2110 } else { 2111 ip6->ip6_hlim = ip6_defhlim; 2112 } 2113 2114 icmp6->icmp6_cksum = 0; 2115 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6, 2116 sizeof(struct ip6_hdr), plen); 2117 2118 /* 2119 * XXX option handling 2120 */ 2121 2122 m->m_flags &= ~(M_BCAST|M_MCAST); 2123 2124 #ifdef COMPAT_RFC1885 2125 ip6_output(m, NULL, &icmp6_reflect_rt, 0, NULL, &outif, NULL); 2126 #else 2127 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL); 2128 #endif 2129 if (outif) 2130 icmp6_ifoutstat_inc(outif, type, code); 2131 2132 return; 2133 2134 bad: 2135 m_freem(m); 2136 return; 2137 } 2138 2139 static void 2140 icmp6_fasttimo_dispatch(netmsg_t nmsg) 2141 { 2142 2143 ASSERT_NETISR0; 2144 2145 /* Reply ASAP. */ 2146 crit_enter(); 2147 netisr_replymsg(&nmsg->base, 0); 2148 crit_exit(); 2149 2150 mld6_fasttimeo(); 2151 2152 callout_reset(&icmp6_fasttimo_ch, ICMP6_FASTTIMO, icmp6_fasttimo, NULL); 2153 } 2154 2155 static void 2156 icmp6_fasttimo(void *dummy __unused) 2157 { 2158 struct netmsg_base *nmsg = &icmp6_fasttimo_nmsg; 2159 2160 KKASSERT(mycpuid == 0); 2161 2162 crit_enter(); 2163 if (nmsg->lmsg.ms_flags & MSGF_DONE) 2164 netisr_sendmsg_oncpu(nmsg); 2165 crit_exit(); 2166 } 2167 2168 static const char * 2169 icmp6_redirect_diag(struct in6_addr *src6, struct in6_addr *dst6, 2170 struct in6_addr *tgt6) 2171 { 2172 static char buf[1024]; 2173 ksnprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)", 2174 ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6)); 2175 return buf; 2176 } 2177 2178 void 2179 icmp6_redirect_input(struct mbuf *m, int off) 2180 { 2181 struct ifnet *ifp = m->m_pkthdr.rcvif; 2182 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 2183 struct nd_redirect *nd_rd; 2184 int icmp6len = ntohs(ip6->ip6_plen); 2185 char *lladdr = NULL; 2186 int lladdrlen = 0; 2187 #if 0 2188 u_char *redirhdr = NULL; 2189 int redirhdrlen = 0; 2190 #endif 2191 struct rtentry *rt = NULL; 2192 int is_router; 2193 int is_onlink; 2194 struct in6_addr src6 = ip6->ip6_src; 2195 struct in6_addr redtgt6; 2196 struct in6_addr reddst6; 2197 union nd_opts ndopts; 2198 2199 if (!m || !ifp) 2200 return; 2201 2202 /* XXX if we are router, we don't update route by icmp6 redirect */ 2203 if (ip6_forwarding) 2204 goto freeit; 2205 if (!icmp6_rediraccept) 2206 goto freeit; 2207 2208 #ifndef PULLDOWN_TEST 2209 IP6_EXTHDR_CHECK(m, off, icmp6len,); 2210 nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off); 2211 #else 2212 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len); 2213 if (nd_rd == NULL) { 2214 icmp6stat.icp6s_tooshort++; 2215 return; 2216 } 2217 #endif 2218 redtgt6 = nd_rd->nd_rd_target; 2219 reddst6 = nd_rd->nd_rd_dst; 2220 2221 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 2222 redtgt6.s6_addr16[1] = htons(ifp->if_index); 2223 if (IN6_IS_ADDR_LINKLOCAL(&reddst6)) 2224 reddst6.s6_addr16[1] = htons(ifp->if_index); 2225 2226 /* validation */ 2227 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) { 2228 nd6log((LOG_ERR, 2229 "ICMP6 redirect sent from %s rejected; " 2230 "must be from linklocal\n", ip6_sprintf(&src6))); 2231 goto bad; 2232 } 2233 if (ip6->ip6_hlim != 255) { 2234 nd6log((LOG_ERR, 2235 "ICMP6 redirect sent from %s rejected; " 2236 "hlim=%d (must be 255)\n", 2237 ip6_sprintf(&src6), ip6->ip6_hlim)); 2238 goto bad; 2239 } 2240 { 2241 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */ 2242 struct sockaddr_in6 sin6; 2243 struct in6_addr *gw6; 2244 2245 bzero(&sin6, sizeof(sin6)); 2246 sin6.sin6_family = AF_INET6; 2247 sin6.sin6_len = sizeof(struct sockaddr_in6); 2248 bcopy(&reddst6, &sin6.sin6_addr, sizeof reddst6); 2249 rt = rtpurelookup((struct sockaddr *)&sin6); 2250 if (rt != NULL) { 2251 if (rt->rt_gateway == NULL || 2252 rt->rt_gateway->sa_family != AF_INET6) { 2253 nd6log((LOG_ERR, 2254 "ICMP6 redirect rejected; no route " 2255 "with inet6 gateway found for redirect dst: %s\n", 2256 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2257 --rt->rt_refcnt; 2258 goto bad; 2259 } 2260 2261 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr); 2262 if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) { 2263 nd6log((LOG_ERR, 2264 "ICMP6 redirect rejected; " 2265 "not equal to gw-for-src=%s (must be same): " 2266 "%s\n", 2267 ip6_sprintf(gw6), 2268 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2269 --rt->rt_refcnt; 2270 goto bad; 2271 } 2272 } else { 2273 nd6log((LOG_ERR, 2274 "ICMP6 redirect rejected; " 2275 "no route found for redirect dst: %s\n", 2276 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2277 goto bad; 2278 } 2279 --rt->rt_refcnt; 2280 rt = NULL; 2281 } 2282 if (IN6_IS_ADDR_MULTICAST(&reddst6)) { 2283 nd6log((LOG_ERR, 2284 "ICMP6 redirect rejected; " 2285 "redirect dst must be unicast: %s\n", 2286 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2287 goto bad; 2288 } 2289 2290 is_router = is_onlink = 0; 2291 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 2292 is_router = 1; /* router case */ 2293 if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0) 2294 is_onlink = 1; /* on-link destination case */ 2295 if (!is_router && !is_onlink) { 2296 nd6log((LOG_ERR, 2297 "ICMP6 redirect rejected; " 2298 "neither router case nor onlink case: %s\n", 2299 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2300 goto bad; 2301 } 2302 /* validation passed */ 2303 2304 icmp6len -= sizeof(*nd_rd); 2305 nd6_option_init(nd_rd + 1, icmp6len, &ndopts); 2306 if (nd6_options(&ndopts) < 0) { 2307 nd6log((LOG_INFO, "icmp6_redirect_input: " 2308 "invalid ND option, rejected: %s\n", 2309 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2310 /* nd6_options have incremented stats */ 2311 goto freeit; 2312 } 2313 2314 if (ndopts.nd_opts_tgt_lladdr) { 2315 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 2316 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 2317 } 2318 2319 #if 0 2320 if (ndopts.nd_opts_rh) { 2321 redirhdrlen = ndopts.nd_opts_rh->nd_opt_rh_len; 2322 redirhdr = (u_char *)(ndopts.nd_opts_rh + 1); /* xxx */ 2323 } 2324 #endif 2325 2326 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 2327 nd6log((LOG_INFO, 2328 "icmp6_redirect_input: lladdrlen mismatch for %s " 2329 "(if %d, icmp6 packet %d): %s\n", 2330 ip6_sprintf(&redtgt6), ifp->if_addrlen, lladdrlen - 2, 2331 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2332 goto bad; 2333 } 2334 2335 /* RFC 2461 8.3 */ 2336 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT, 2337 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER); 2338 2339 if (!is_onlink) { /* better router case. perform rtredirect. */ 2340 /* perform rtredirect */ 2341 struct sockaddr_in6 sdst; 2342 struct sockaddr_in6 sgw; 2343 struct sockaddr_in6 ssrc; 2344 2345 bzero(&sdst, sizeof(sdst)); 2346 bzero(&sgw, sizeof(sgw)); 2347 bzero(&ssrc, sizeof(ssrc)); 2348 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6; 2349 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len = 2350 sizeof(struct sockaddr_in6); 2351 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr)); 2352 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2353 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr)); 2354 rtredirect((struct sockaddr *)&sdst, (struct sockaddr *)&sgw, 2355 NULL, RTF_GATEWAY | RTF_HOST, 2356 (struct sockaddr *)&ssrc); 2357 } 2358 /* finally update cached route in each socket via kpfctlinput */ 2359 { 2360 struct sockaddr_in6 sdst; 2361 2362 bzero(&sdst, sizeof(sdst)); 2363 sdst.sin6_family = AF_INET6; 2364 sdst.sin6_len = sizeof(struct sockaddr_in6); 2365 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2366 kpfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst); 2367 #ifdef IPSEC 2368 key_sa_routechange((struct sockaddr *)&sdst); 2369 #endif 2370 } 2371 2372 freeit: 2373 m_freem(m); 2374 return; 2375 2376 bad: 2377 icmp6stat.icp6s_badredirect++; 2378 m_freem(m); 2379 } 2380 2381 void 2382 icmp6_redirect_output(struct mbuf *m0, struct rtentry *rt) 2383 { 2384 struct ifnet *ifp; /* my outgoing interface */ 2385 struct in6_addr *ifp_ll6; 2386 struct in6_addr *router_ll6; 2387 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */ 2388 struct mbuf *m = NULL; /* newly allocated one */ 2389 struct ip6_hdr *ip6; /* m as struct ip6_hdr */ 2390 struct nd_redirect *nd_rd; 2391 size_t maxlen; 2392 u_char *p; 2393 struct ifnet *outif = NULL; 2394 struct sockaddr_in6 src_sa; 2395 2396 icmp6_errcount(&icmp6stat.icp6s_outerrhist, ND_REDIRECT, 0); 2397 2398 /* if we are not router, we don't send icmp6 redirect */ 2399 if (!ip6_forwarding || ip6_accept_rtadv) 2400 goto fail; 2401 2402 /* sanity check */ 2403 if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp)) 2404 goto fail; 2405 2406 /* 2407 * Address check: 2408 * the source address must identify a neighbor, and 2409 * the destination address must not be a multicast address 2410 * [RFC 2461, sec 8.2] 2411 */ 2412 sip6 = mtod(m0, struct ip6_hdr *); 2413 bzero(&src_sa, sizeof(src_sa)); 2414 src_sa.sin6_family = AF_INET6; 2415 src_sa.sin6_len = sizeof(src_sa); 2416 src_sa.sin6_addr = sip6->ip6_src; 2417 /* we don't currently use sin6_scope_id, but eventually use it */ 2418 if (in6_addr2zoneid(ifp, &sip6->ip6_src, &src_sa.sin6_scope_id)) 2419 goto fail; 2420 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0) 2421 goto fail; 2422 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst)) 2423 goto fail; /* what should we do here? */ 2424 2425 /* rate limit */ 2426 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0)) 2427 goto fail; 2428 2429 /* 2430 * Since we are going to append up to 1280 bytes (= IPV6_MMTU), 2431 * we almost always ask for an mbuf cluster for simplicity. 2432 * (MHLEN < IPV6_MMTU is almost always true) 2433 */ 2434 #if IPV6_MMTU >= MCLBYTES 2435 # error assumption failed about IPV6_MMTU and MCLBYTES 2436 #endif 2437 m = m_getb(IPV6_MMTU, M_NOWAIT, MT_HEADER, M_PKTHDR); 2438 if (!m) 2439 goto fail; 2440 m->m_len = 0; 2441 maxlen = M_TRAILINGSPACE(m); 2442 maxlen = min(IPV6_MMTU, maxlen); 2443 /* just for safety */ 2444 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) + 2445 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) { 2446 goto fail; 2447 } 2448 2449 { 2450 /* get ip6 linklocal address for ifp(my outgoing interface). */ 2451 struct in6_ifaddr *ia; 2452 if ((ia = in6ifa_ifpforlinklocal(ifp, 2453 IN6_IFF_NOTREADY| 2454 IN6_IFF_ANYCAST)) == NULL) 2455 goto fail; 2456 ifp_ll6 = &ia->ia_addr.sin6_addr; 2457 } 2458 2459 /* get ip6 linklocal address for the router. */ 2460 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) { 2461 struct sockaddr_in6 *sin6; 2462 sin6 = (struct sockaddr_in6 *)rt->rt_gateway; 2463 router_ll6 = &sin6->sin6_addr; 2464 if (!IN6_IS_ADDR_LINKLOCAL(router_ll6)) 2465 router_ll6 = NULL; 2466 } else 2467 router_ll6 = NULL; 2468 2469 /* ip6 */ 2470 ip6 = mtod(m, struct ip6_hdr *); 2471 ip6->ip6_flow = 0; 2472 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2473 ip6->ip6_vfc |= IPV6_VERSION; 2474 /* ip6->ip6_plen will be set later */ 2475 ip6->ip6_nxt = IPPROTO_ICMPV6; 2476 ip6->ip6_hlim = 255; 2477 /* ip6->ip6_src must be linklocal addr for my outgoing if. */ 2478 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr)); 2479 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr)); 2480 2481 /* ND Redirect */ 2482 nd_rd = (struct nd_redirect *)(ip6 + 1); 2483 nd_rd->nd_rd_type = ND_REDIRECT; 2484 nd_rd->nd_rd_code = 0; 2485 nd_rd->nd_rd_reserved = 0; 2486 if (rt->rt_flags & RTF_GATEWAY) { 2487 /* 2488 * nd_rd->nd_rd_target must be a link-local address in 2489 * better router cases. 2490 */ 2491 if (!router_ll6) 2492 goto fail; 2493 bcopy(router_ll6, &nd_rd->nd_rd_target, 2494 sizeof(nd_rd->nd_rd_target)); 2495 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2496 sizeof(nd_rd->nd_rd_dst)); 2497 } else { 2498 /* make sure redtgt == reddst */ 2499 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target, 2500 sizeof(nd_rd->nd_rd_target)); 2501 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2502 sizeof(nd_rd->nd_rd_dst)); 2503 } 2504 2505 p = (u_char *)(nd_rd + 1); 2506 2507 if (!router_ll6) 2508 goto nolladdropt; 2509 2510 { 2511 /* target lladdr option */ 2512 struct rtentry *rt_router = NULL; 2513 int len; 2514 struct sockaddr_dl *sdl; 2515 struct nd_opt_hdr *nd_opt; 2516 char *lladdr; 2517 2518 rt_router = nd6_lookup(router_ll6, 0, ifp); 2519 if (!rt_router) 2520 goto nolladdropt; 2521 len = sizeof(*nd_opt) + ifp->if_addrlen; 2522 len = (len + 7) & ~7; /* round by 8 */ 2523 /* safety check */ 2524 if (len + (p - (u_char *)ip6) > maxlen) 2525 goto nolladdropt; 2526 if (!(rt_router->rt_flags & RTF_GATEWAY) && 2527 (rt_router->rt_flags & RTF_LLINFO) && 2528 (rt_router->rt_gateway->sa_family == AF_LINK) && 2529 (sdl = (struct sockaddr_dl *)rt_router->rt_gateway) && 2530 sdl->sdl_alen) { 2531 nd_opt = (struct nd_opt_hdr *)p; 2532 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 2533 nd_opt->nd_opt_len = len >> 3; 2534 lladdr = (char *)(nd_opt + 1); 2535 bcopy(LLADDR(sdl), lladdr, ifp->if_addrlen); 2536 p += len; 2537 } 2538 } 2539 nolladdropt:; 2540 2541 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2542 2543 /* just to be safe */ 2544 #ifdef M_DECRYPTED /*not openbsd*/ 2545 if (m0->m_flags & M_DECRYPTED) 2546 goto noredhdropt; 2547 #endif 2548 if (p - (u_char *)ip6 > maxlen) 2549 goto noredhdropt; 2550 2551 { 2552 /* redirected header option */ 2553 int len; 2554 struct nd_opt_rd_hdr *nd_opt_rh; 2555 2556 /* 2557 * compute the maximum size for icmp6 redirect header option. 2558 * XXX room for auth header? 2559 */ 2560 len = maxlen - (p - (u_char *)ip6); 2561 len &= ~7; 2562 2563 /* This is just for simplicity. */ 2564 if (m0->m_pkthdr.len != m0->m_len) { 2565 if (m0->m_next) { 2566 m_freem(m0->m_next); 2567 m0->m_next = NULL; 2568 } 2569 m0->m_pkthdr.len = m0->m_len; 2570 } 2571 2572 /* 2573 * Redirected header option spec (RFC2461 4.6.3) talks nothing 2574 * about padding/truncate rule for the original IP packet. 2575 * From the discussion on IPv6imp in Feb 1999, the consensus was: 2576 * - "attach as much as possible" is the goal 2577 * - pad if not aligned (original size can be guessed by original 2578 * ip6 header) 2579 * Following code adds the padding if it is simple enough, 2580 * and truncates if not. 2581 */ 2582 if (m0->m_next || m0->m_pkthdr.len != m0->m_len) 2583 panic("assumption failed in %s:%d", __FILE__, __LINE__); 2584 2585 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) { 2586 /* not enough room, truncate */ 2587 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh); 2588 } else { 2589 /* enough room, pad or truncate */ 2590 size_t extra; 2591 2592 extra = m0->m_pkthdr.len % 8; 2593 if (extra) { 2594 /* pad if easy enough, truncate if not */ 2595 if (8 - extra <= M_TRAILINGSPACE(m0)) { 2596 /* pad */ 2597 m0->m_len += (8 - extra); 2598 m0->m_pkthdr.len += (8 - extra); 2599 } else { 2600 /* truncate */ 2601 m0->m_pkthdr.len -= extra; 2602 m0->m_len -= extra; 2603 } 2604 } 2605 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh); 2606 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh); 2607 } 2608 2609 nd_opt_rh = (struct nd_opt_rd_hdr *)p; 2610 bzero(nd_opt_rh, sizeof(*nd_opt_rh)); 2611 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER; 2612 nd_opt_rh->nd_opt_rh_len = len >> 3; 2613 p += sizeof(*nd_opt_rh); 2614 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2615 2616 /* connect m0 to m */ 2617 m->m_next = m0; 2618 m->m_pkthdr.len = m->m_len + m0->m_len; 2619 m0 = NULL; 2620 } 2621 noredhdropt:; 2622 if (m0 != NULL) { 2623 m_freem(m0); 2624 m0 = NULL; 2625 } 2626 2627 /* XXX: clear embedded link IDs in the inner header */ 2628 in6_clearscope(&sip6->ip6_src); 2629 in6_clearscope(&sip6->ip6_dst); 2630 in6_clearscope(&nd_rd->nd_rd_target); 2631 in6_clearscope(&nd_rd->nd_rd_dst); 2632 2633 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 2634 2635 nd_rd->nd_rd_cksum = 0; 2636 nd_rd->nd_rd_cksum 2637 = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen)); 2638 2639 /* send the packet to outside... */ 2640 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL); 2641 if (outif) { 2642 icmp6_ifstat_inc(outif, ifs6_out_msg); 2643 icmp6_ifstat_inc(outif, ifs6_out_redirect); 2644 } 2645 icmp6stat.icp6s_outhist[ND_REDIRECT]++; 2646 2647 return; 2648 2649 fail: 2650 if (m) 2651 m_freem(m); 2652 if (m0) 2653 m_freem(m0); 2654 } 2655 2656 #ifdef HAVE_NRL_INPCB 2657 #define in6pcb inpcb 2658 #define in6p_icmp6filt inp_icmp6filt 2659 #endif 2660 /* 2661 * ICMPv6 socket option processing. 2662 */ 2663 void 2664 icmp6_ctloutput(netmsg_t msg) 2665 { 2666 struct socket *so = msg->ctloutput.base.nm_so; 2667 struct sockopt *sopt = msg->ctloutput.nm_sopt; 2668 int error = 0; 2669 int optlen; 2670 struct inpcb *inp = so->so_pcb; 2671 int level, op, optname; 2672 2673 if (sopt) { 2674 level = sopt->sopt_level; 2675 op = sopt->sopt_dir; 2676 optname = sopt->sopt_name; 2677 optlen = sopt->sopt_valsize; 2678 } else 2679 level = op = optname = optlen = 0; 2680 2681 if (level != IPPROTO_ICMPV6) { 2682 error = EINVAL; 2683 goto out; 2684 } 2685 2686 switch (op) { 2687 case PRCO_SETOPT: 2688 switch (optname) { 2689 case ICMP6_FILTER: 2690 { 2691 if (optlen != sizeof(struct icmp6_filter)) { 2692 error = EMSGSIZE; 2693 break; 2694 } 2695 if (inp->in6p_icmp6filt == NULL) { 2696 error = EINVAL; 2697 break; 2698 } 2699 error = soopt_to_kbuf(sopt, inp->in6p_icmp6filt, optlen, 2700 optlen); 2701 break; 2702 } 2703 2704 default: 2705 error = ENOPROTOOPT; 2706 break; 2707 } 2708 break; 2709 2710 case PRCO_GETOPT: 2711 switch (optname) { 2712 case ICMP6_FILTER: 2713 { 2714 if (inp->in6p_icmp6filt == NULL) { 2715 error = EINVAL; 2716 break; 2717 } 2718 soopt_from_kbuf(sopt, inp->in6p_icmp6filt, 2719 sizeof(struct icmp6_filter)); 2720 break; 2721 } 2722 2723 default: 2724 error = ENOPROTOOPT; 2725 break; 2726 } 2727 break; 2728 } 2729 out: 2730 lwkt_replymsg(&msg->ctloutput.base.lmsg, error); 2731 } 2732 #ifdef HAVE_NRL_INPCB 2733 #undef in6pcb 2734 #undef in6p_icmp6filt 2735 #endif 2736 2737 #ifndef HAVE_PPSRATECHECK 2738 #ifndef timersub 2739 #define timersub(tvp, uvp, vvp) \ 2740 do { \ 2741 (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec; \ 2742 (vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec; \ 2743 if ((vvp)->tv_usec < 0) { \ 2744 (vvp)->tv_sec--; \ 2745 (vvp)->tv_usec += 1000000; \ 2746 } \ 2747 } while (0) 2748 #endif 2749 2750 /* 2751 * ppsratecheck(): packets (or events) per second limitation. 2752 */ 2753 static int 2754 ppsratecheck(struct timeval *lasttime, int *curpps, 2755 int maxpps) /* maximum pps allowed */ 2756 { 2757 struct timeval tv, delta; 2758 int rv; 2759 2760 microtime(&tv); 2761 2762 timersub(&tv, lasttime, &delta); 2763 2764 /* 2765 * Check for 0,0 so that the message will be seen at least once. 2766 * If more than one second has passed since the last update of 2767 * lasttime, reset the counter. 2768 * 2769 * We do increment *curpps even in *curpps < maxpps case, as some may 2770 * try to use *curpps for stat purposes as well. 2771 */ 2772 if ((lasttime->tv_sec == 0 && lasttime->tv_usec == 0) || 2773 delta.tv_sec >= 1) { 2774 *lasttime = tv; 2775 *curpps = 0; 2776 rv = 1; 2777 } else if (maxpps < 0) 2778 rv = 1; 2779 else if (*curpps < maxpps) 2780 rv = 1; 2781 else 2782 rv = 0; 2783 2784 #if 1 /* DIAGNOSTIC? */ 2785 /* be careful about wrap-around */ 2786 if (*curpps + 1 > *curpps) 2787 *curpps = *curpps + 1; 2788 #else 2789 /* 2790 * assume that there's not too many calls to this function. 2791 * not sure if the assumption holds, as it depends on *caller's* 2792 * behavior, not the behavior of this function. 2793 * IMHO it is wrong to make assumption on the caller's behavior, 2794 * so the above #if is #if 1, not #ifdef DIAGNOSTIC. 2795 */ 2796 *curpps = *curpps + 1; 2797 #endif 2798 2799 return (rv); 2800 } 2801 #endif 2802 2803 /* 2804 * Perform rate limit check. 2805 * Returns 0 if it is okay to send the icmp6 packet. 2806 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate 2807 * limitation. 2808 * 2809 * XXX per-destination/type check necessary? 2810 */ 2811 static int 2812 icmp6_ratelimit(const struct in6_addr *dst, /* not used at this moment */ 2813 const int type, /* not used at this moment */ 2814 const int code) /* not used at this moment */ 2815 { 2816 int ret; 2817 2818 ret = 0; /* okay to send */ 2819 2820 /* PPS limit */ 2821 if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count, 2822 icmp6errppslim)) { 2823 /* The packet is subject to rate limit */ 2824 ret++; 2825 } 2826 2827 return ret; 2828 } 2829