icmp6.c revision 1.37
1 /* $NetBSD: icmp6.c,v 1.37 2000/07/09 06:44:58 itojun Exp $ */ 2 /* $KAME: icmp6.c,v 1.120 2000/07/06 11:47:20 itojun Exp $ */ 3 4 /* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* 34 * Copyright (c) 1982, 1986, 1988, 1993 35 * The Regents of the University of California. All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. All advertising materials mentioning features or use of this software 46 * must display the following acknowledgement: 47 * This product includes software developed by the University of 48 * California, Berkeley and its contributors. 49 * 4. Neither the name of the University nor the names of its contributors 50 * may be used to endorse or promote products derived from this software 51 * without specific prior written permission. 52 * 53 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 54 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 55 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 56 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 57 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 58 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 59 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 61 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 62 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 63 * SUCH DAMAGE. 64 * 65 * @(#)ip_icmp.c 8.2 (Berkeley) 1/4/94 66 */ 67 68 #include "opt_inet.h" 69 #include "opt_ipsec.h" 70 71 #include <sys/param.h> 72 #include <sys/systm.h> 73 #include <sys/malloc.h> 74 #include <sys/mbuf.h> 75 #include <sys/protosw.h> 76 #include <sys/socket.h> 77 #include <sys/socketvar.h> 78 #include <sys/time.h> 79 #include <sys/kernel.h> 80 #include <sys/syslog.h> 81 #include <sys/domain.h> 82 83 #include <net/if.h> 84 #include <net/route.h> 85 #include <net/if_dl.h> 86 #include <net/if_types.h> 87 88 #include <netinet/in.h> 89 #include <netinet/in_var.h> 90 #include <netinet/ip6.h> 91 #include <netinet6/ip6_var.h> 92 #include <netinet/icmp6.h> 93 #include <netinet6/mld6_var.h> 94 #include <netinet6/in6_pcb.h> 95 #include <netinet6/nd6.h> 96 #include <netinet6/in6_ifattach.h> 97 #include <netinet6/ip6protosw.h> 98 99 100 #ifdef IPSEC 101 #include <netinet6/ipsec.h> 102 #include <netkey/key.h> 103 #endif 104 105 #include "faith.h" 106 107 #include <net/net_osdep.h> 108 109 extern struct domain inet6domain; 110 111 struct icmp6stat icmp6stat; 112 113 extern struct in6pcb rawin6pcb; 114 extern struct timeval icmp6errratelim; 115 static struct timeval icmp6errratelim_last; 116 extern int icmp6errppslim; 117 static int icmp6errpps_count = 0; 118 static struct timeval icmp6errppslim_last; 119 extern int icmp6_nodeinfo; 120 static struct rttimer_queue *icmp6_mtudisc_timeout_q = NULL; 121 extern int pmtu_expire; 122 123 static void icmp6_errcount __P((struct icmp6errstat *, int, int)); 124 static int icmp6_rip6_input __P((struct mbuf **, int)); 125 static void icmp6_mtudisc_update __P((struct in6_addr *, struct icmp6_hdr *, 126 struct mbuf *)); 127 static int icmp6_ratelimit __P((const struct in6_addr *, const int, const int)); 128 static const char *icmp6_redirect_diag __P((struct in6_addr *, 129 struct in6_addr *, struct in6_addr *)); 130 static struct mbuf *ni6_input __P((struct mbuf *, int)); 131 static struct mbuf *ni6_nametodns __P((const char *, int, int)); 132 static int ni6_dnsmatch __P((const char *, int, const char *, int)); 133 static int ni6_addrs __P((struct icmp6_nodeinfo *, struct mbuf *, 134 struct ifnet **)); 135 static int ni6_store_addrs __P((struct icmp6_nodeinfo *, struct icmp6_nodeinfo *, 136 struct ifnet *, int)); 137 static struct rtentry *icmp6_mtudisc_clone __P((struct sockaddr *)); 138 static void icmp6_mtudisc_timeout __P((struct rtentry *, struct rttimer *)); 139 140 #ifdef COMPAT_RFC1885 141 static struct route_in6 icmp6_reflect_rt; 142 #endif 143 144 void 145 icmp6_init() 146 { 147 mld6_init(); 148 icmp6_mtudisc_timeout_q = rt_timer_queue_create(pmtu_expire); 149 } 150 151 static void 152 icmp6_errcount(stat, type, code) 153 struct icmp6errstat *stat; 154 int type, code; 155 { 156 switch(type) { 157 case ICMP6_DST_UNREACH: 158 switch (code) { 159 case ICMP6_DST_UNREACH_NOROUTE: 160 stat->icp6errs_dst_unreach_noroute++; 161 return; 162 case ICMP6_DST_UNREACH_ADMIN: 163 stat->icp6errs_dst_unreach_admin++; 164 return; 165 case ICMP6_DST_UNREACH_BEYONDSCOPE: 166 stat->icp6errs_dst_unreach_beyondscope++; 167 return; 168 case ICMP6_DST_UNREACH_ADDR: 169 stat->icp6errs_dst_unreach_addr++; 170 return; 171 case ICMP6_DST_UNREACH_NOPORT: 172 stat->icp6errs_dst_unreach_noport++; 173 return; 174 } 175 break; 176 case ICMP6_PACKET_TOO_BIG: 177 stat->icp6errs_packet_too_big++; 178 return; 179 case ICMP6_TIME_EXCEEDED: 180 switch(code) { 181 case ICMP6_TIME_EXCEED_TRANSIT: 182 stat->icp6errs_time_exceed_transit++; 183 return; 184 case ICMP6_TIME_EXCEED_REASSEMBLY: 185 stat->icp6errs_time_exceed_reassembly++; 186 return; 187 } 188 break; 189 case ICMP6_PARAM_PROB: 190 switch(code) { 191 case ICMP6_PARAMPROB_HEADER: 192 stat->icp6errs_paramprob_header++; 193 return; 194 case ICMP6_PARAMPROB_NEXTHEADER: 195 stat->icp6errs_paramprob_nextheader++; 196 return; 197 case ICMP6_PARAMPROB_OPTION: 198 stat->icp6errs_paramprob_option++; 199 return; 200 } 201 break; 202 case ND_REDIRECT: 203 stat->icp6errs_redirect++; 204 return; 205 } 206 stat->icp6errs_unknown++; 207 } 208 209 /* 210 * Generate an error packet of type error in response to bad IP6 packet. 211 */ 212 void 213 icmp6_error(m, type, code, param) 214 struct mbuf *m; 215 int type, code, param; 216 { 217 struct ip6_hdr *oip6, *nip6; 218 struct icmp6_hdr *icmp6; 219 u_int preplen; 220 int off; 221 int nxt; 222 223 icmp6stat.icp6s_error++; 224 225 /* count per-type-code statistics */ 226 icmp6_errcount(&icmp6stat.icp6s_outerrhist, type, code); 227 228 if (m->m_flags & M_DECRYPTED) { 229 icmp6stat.icp6s_canterror++; 230 goto freeit; 231 } 232 233 #ifndef PULLDOWN_TEST 234 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), ); 235 #else 236 if (m->m_len < sizeof(struct ip6_hdr)) { 237 m = m_pullup(m, sizeof(struct ip6_hdr)); 238 if (m == NULL) 239 return; 240 } 241 #endif 242 oip6 = mtod(m, struct ip6_hdr *); 243 244 /* 245 * Multicast destination check. For unrecognized option errors, 246 * this check has already done in ip6_unknown_opt(), so we can 247 * check only for other errors. 248 */ 249 if ((m->m_flags & (M_BCAST|M_MCAST) || 250 IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) && 251 (type != ICMP6_PACKET_TOO_BIG && 252 (type != ICMP6_PARAM_PROB || 253 code != ICMP6_PARAMPROB_OPTION))) 254 goto freeit; 255 256 /* Source address check. XXX: the case of anycast source? */ 257 if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) || 258 IN6_IS_ADDR_MULTICAST(&oip6->ip6_src)) 259 goto freeit; 260 261 /* 262 * If we are about to send ICMPv6 against ICMPv6 error/redirect, 263 * don't do it. 264 */ 265 nxt = -1; 266 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 267 if (off >= 0 && nxt == IPPROTO_ICMPV6) { 268 struct icmp6_hdr *icp; 269 270 #ifndef PULLDOWN_TEST 271 IP6_EXTHDR_CHECK(m, 0, off + sizeof(struct icmp6_hdr), ); 272 icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 273 #else 274 IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off, 275 sizeof(*icp)); 276 if (icp == NULL) { 277 icmp6stat.icp6s_tooshort++; 278 return; 279 } 280 #endif 281 if (icp->icmp6_type < ICMP6_ECHO_REQUEST || 282 icp->icmp6_type == ND_REDIRECT) { 283 /* 284 * ICMPv6 error 285 * Special case: for redirect (which is 286 * informational) we must not send icmp6 error. 287 */ 288 icmp6stat.icp6s_canterror++; 289 goto freeit; 290 } else { 291 /* ICMPv6 informational - send the error */ 292 } 293 } else { 294 /* non-ICMPv6 - send the error */ 295 } 296 297 oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */ 298 299 /* Finally, do rate limitation check. */ 300 if (icmp6_ratelimit(&oip6->ip6_src, type, code)) { 301 icmp6stat.icp6s_toofreq++; 302 goto freeit; 303 } 304 305 /* 306 * OK, ICMP6 can be generated. 307 */ 308 309 if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN) 310 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len); 311 312 preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 313 M_PREPEND(m, preplen, M_DONTWAIT); 314 if (m && m->m_len < preplen) 315 m = m_pullup(m, preplen); 316 if (m == NULL) { 317 printf("ENOBUFS in icmp6_error %d\n", __LINE__); 318 return; 319 } 320 321 nip6 = mtod(m, struct ip6_hdr *); 322 nip6->ip6_src = oip6->ip6_src; 323 nip6->ip6_dst = oip6->ip6_dst; 324 325 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_src)) 326 oip6->ip6_src.s6_addr16[1] = 0; 327 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_dst)) 328 oip6->ip6_dst.s6_addr16[1] = 0; 329 330 icmp6 = (struct icmp6_hdr *)(nip6 + 1); 331 icmp6->icmp6_type = type; 332 icmp6->icmp6_code = code; 333 icmp6->icmp6_pptr = htonl((u_int32_t)param); 334 335 icmp6stat.icp6s_outhist[type]++; 336 icmp6_reflect(m, sizeof(struct ip6_hdr)); /*header order: IPv6 - ICMPv6*/ 337 338 return; 339 340 freeit: 341 /* 342 * If we can't tell wheter or not we can generate ICMP6, free it. 343 */ 344 m_freem(m); 345 } 346 347 /* 348 * Process a received ICMP6 message. 349 */ 350 int 351 icmp6_input(mp, offp, proto) 352 struct mbuf **mp; 353 int *offp, proto; 354 { 355 struct mbuf *m = *mp, *n; 356 struct ip6_hdr *ip6, *nip6; 357 struct icmp6_hdr *icmp6, *nicmp6; 358 int off = *offp; 359 int icmp6len = m->m_pkthdr.len - *offp; 360 int code, sum, noff; 361 struct sockaddr_in6 icmp6src; 362 363 #ifndef PULLDOWN_TEST 364 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr), IPPROTO_DONE); 365 /* m might change if M_LOOP. So, call mtod after this */ 366 #endif 367 368 /* 369 * Locate icmp6 structure in mbuf, and check 370 * that not corrupted and of at least minimum length 371 */ 372 373 ip6 = mtod(m, struct ip6_hdr *); 374 if (icmp6len < sizeof(struct icmp6_hdr)) { 375 icmp6stat.icp6s_tooshort++; 376 goto freeit; 377 } 378 379 /* 380 * calculate the checksum 381 */ 382 #ifndef PULLDOWN_TEST 383 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off); 384 #else 385 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 386 if (icmp6 == NULL) { 387 icmp6stat.icp6s_tooshort++; 388 return IPPROTO_DONE; 389 } 390 #endif 391 code = icmp6->icmp6_code; 392 393 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) { 394 log(LOG_ERR, 395 "ICMP6 checksum error(%d|%x) %s\n", 396 icmp6->icmp6_type, 397 sum, 398 ip6_sprintf(&ip6->ip6_src)); 399 icmp6stat.icp6s_checksum++; 400 goto freeit; 401 } 402 403 #if defined(NFAITH) && 0 < NFAITH 404 if (m->m_pkthdr.rcvif && m->m_pkthdr.rcvif->if_type == IFT_FAITH) { 405 /* 406 * Deliver very specific ICMP6 type only. 407 * This is important to deilver TOOBIG. Otherwise PMTUD 408 * will not work. 409 */ 410 switch (icmp6->icmp6_type) { 411 case ICMP6_DST_UNREACH: 412 case ICMP6_PACKET_TOO_BIG: 413 case ICMP6_TIME_EXCEEDED: 414 break; 415 default: 416 goto freeit; 417 } 418 } 419 #endif 420 421 #ifdef IPSEC 422 /* drop it if it does not match the default policy */ 423 if (ipsec6_in_reject(m, NULL)) { 424 ipsecstat.in_polvio++; 425 goto freeit; 426 } 427 #endif 428 429 icmp6stat.icp6s_inhist[icmp6->icmp6_type]++; 430 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_msg); 431 if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK) 432 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error); 433 434 switch (icmp6->icmp6_type) { 435 436 case ICMP6_DST_UNREACH: 437 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_dstunreach); 438 switch (code) { 439 case ICMP6_DST_UNREACH_NOROUTE: 440 code = PRC_UNREACH_NET; 441 break; 442 case ICMP6_DST_UNREACH_ADMIN: 443 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_adminprohib); 444 code = PRC_UNREACH_PROTOCOL; /* is this a good code? */ 445 break; 446 case ICMP6_DST_UNREACH_ADDR: 447 code = PRC_HOSTDEAD; 448 break; 449 #ifdef COMPAT_RFC1885 450 case ICMP6_DST_UNREACH_NOTNEIGHBOR: 451 code = PRC_UNREACH_SRCFAIL; 452 break; 453 #else 454 case ICMP6_DST_UNREACH_BEYONDSCOPE: 455 /* I mean "source address was incorrect." */ 456 code = PRC_PARAMPROB; 457 break; 458 #endif 459 case ICMP6_DST_UNREACH_NOPORT: 460 code = PRC_UNREACH_PORT; 461 break; 462 default: 463 goto badcode; 464 } 465 goto deliver; 466 break; 467 468 case ICMP6_PACKET_TOO_BIG: 469 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_pkttoobig); 470 if (code != 0) 471 goto badcode; 472 473 code = PRC_MSGSIZE; 474 475 /* 476 * Updating the path MTU will be done after examining 477 * intermediate extension headers. 478 */ 479 goto deliver; 480 break; 481 482 case ICMP6_TIME_EXCEEDED: 483 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_timeexceed); 484 switch (code) { 485 case ICMP6_TIME_EXCEED_TRANSIT: 486 case ICMP6_TIME_EXCEED_REASSEMBLY: 487 code += PRC_TIMXCEED_INTRANS; 488 break; 489 default: 490 goto badcode; 491 } 492 goto deliver; 493 break; 494 495 case ICMP6_PARAM_PROB: 496 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_paramprob); 497 switch (code) { 498 case ICMP6_PARAMPROB_NEXTHEADER: 499 code = PRC_UNREACH_PROTOCOL; 500 break; 501 case ICMP6_PARAMPROB_HEADER: 502 case ICMP6_PARAMPROB_OPTION: 503 code = PRC_PARAMPROB; 504 break; 505 default: 506 goto badcode; 507 } 508 goto deliver; 509 break; 510 511 case ICMP6_ECHO_REQUEST: 512 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echo); 513 if (code != 0) 514 goto badcode; 515 if ((n = m_copy(m, 0, M_COPYALL)) == NULL) { 516 /* Give up remote */ 517 break; 518 } 519 if ((n->m_flags & M_EXT) != 0 520 || n->m_len < off + sizeof(struct icmp6_hdr)) { 521 struct mbuf *n0 = n; 522 const int maxlen = sizeof(*nip6) + sizeof(*nicmp6); 523 524 /* 525 * Prepare an internal mbuf. m_pullup() doesn't 526 * always copy the length we specified. 527 */ 528 if (maxlen >= MCLBYTES) { 529 #ifdef DIAGNOSTIC 530 printf("MCLBYTES too small\n"); 531 #endif 532 /* Give up remote */ 533 m_freem(n0); 534 break; 535 } 536 MGETHDR(n, M_DONTWAIT, n0->m_type); 537 if (n && maxlen >= MHLEN) { 538 MCLGET(n, M_DONTWAIT); 539 if ((n->m_flags & M_EXT) == 0) { 540 m_free(n); 541 n = NULL; 542 } 543 } 544 if (n == NULL) { 545 /* Give up remote */ 546 m_freem(n0); 547 break; 548 } 549 M_COPY_PKTHDR(n, n0); 550 /* 551 * Copy IPv6 and ICMPv6 only. 552 */ 553 nip6 = mtod(n, struct ip6_hdr *); 554 bcopy(ip6, nip6, sizeof(struct ip6_hdr)); 555 nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 556 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); 557 noff = sizeof(struct ip6_hdr); 558 n->m_pkthdr.len = n->m_len = 559 noff + sizeof(struct icmp6_hdr); 560 /* 561 * Adjust mbuf. ip6_plen will be adjusted in 562 * ip6_output(). 563 */ 564 m_adj(n0, off + sizeof(struct icmp6_hdr)); 565 n->m_pkthdr.len += n0->m_pkthdr.len; 566 n->m_next = n0; 567 n0->m_flags &= ~M_PKTHDR; 568 } else { 569 nip6 = mtod(n, struct ip6_hdr *); 570 nicmp6 = (struct icmp6_hdr *)((caddr_t)nip6 + off); 571 noff = off; 572 } 573 nicmp6->icmp6_type = ICMP6_ECHO_REPLY; 574 nicmp6->icmp6_code = 0; 575 if (n) { 576 icmp6stat.icp6s_reflect++; 577 icmp6stat.icp6s_outhist[ICMP6_ECHO_REPLY]++; 578 icmp6_reflect(n, noff); 579 } 580 break; 581 582 case ICMP6_ECHO_REPLY: 583 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echoreply); 584 if (code != 0) 585 goto badcode; 586 break; 587 588 case MLD6_LISTENER_QUERY: 589 case MLD6_LISTENER_REPORT: 590 if (icmp6len < sizeof(struct mld6_hdr)) 591 goto badlen; 592 if (icmp6->icmp6_type == MLD6_LISTENER_QUERY) /* XXX: ugly... */ 593 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldquery); 594 else 595 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldreport); 596 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 597 /* give up local */ 598 mld6_input(m, off); 599 m = NULL; 600 goto freeit; 601 } 602 mld6_input(n, off); 603 /* m stays. */ 604 break; 605 606 case MLD6_LISTENER_DONE: 607 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mlddone); 608 if (icmp6len < sizeof(struct mld6_hdr)) /* necessary? */ 609 goto badlen; 610 break; /* nothing to be done in kernel */ 611 612 case MLD6_MTRACE_RESP: 613 case MLD6_MTRACE: 614 /* XXX: these two are experimental. not officially defind. */ 615 /* XXX: per-interface statistics? */ 616 break; /* just pass it to applications */ 617 618 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */ 619 { 620 enum { WRU, FQDN } mode; 621 622 if (!icmp6_nodeinfo) 623 break; 624 625 if (icmp6len == sizeof(struct icmp6_hdr) + 4) 626 mode = WRU; 627 else if (icmp6len >= sizeof(struct icmp6_nodeinfo)) 628 mode = FQDN; 629 else 630 goto badlen; 631 632 if (mode == FQDN) { 633 #ifndef PULLDOWN_TEST 634 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo), 635 IPPROTO_DONE); 636 #endif 637 n = m_copy(m, 0, M_COPYALL); 638 if (n) 639 n = ni6_input(n, off); 640 /* XXX meaningless if n == NULL */ 641 noff = sizeof(struct ip6_hdr); 642 } else { 643 u_char *p; 644 int maxlen, maxhlen; 645 646 if (code != 0) 647 goto badcode; 648 maxlen = sizeof(*nip6) + sizeof(*nicmp6) + 4; 649 if (maxlen >= MCLBYTES) { 650 #ifdef DIAGNOSTIC 651 printf("MCLBYTES too small\n"); 652 #endif 653 /* Give up remote */ 654 break; 655 } 656 MGETHDR(n, M_DONTWAIT, m->m_type); 657 if (n && maxlen > MHLEN) { 658 MCLGET(n, M_DONTWAIT); 659 if ((n->m_flags & M_EXT) == 0) { 660 m_free(n); 661 n = NULL; 662 } 663 } 664 if (n == NULL) { 665 /* Give up remote */ 666 break; 667 } 668 n->m_len = 0; 669 maxhlen = M_TRAILINGSPACE(n) - maxlen; 670 if (maxhlen > hostnamelen) 671 maxhlen = hostnamelen; 672 /* 673 * Copy IPv6 and ICMPv6 only. 674 */ 675 nip6 = mtod(n, struct ip6_hdr *); 676 bcopy(ip6, nip6, sizeof(struct ip6_hdr)); 677 nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 678 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); 679 p = (u_char *)(nicmp6 + 1); 680 bzero(p, 4); 681 bcopy(hostname, p + 4, maxhlen); /*meaningless TTL*/ 682 noff = sizeof(struct ip6_hdr); 683 M_COPY_PKTHDR(n, m); /* just for recvif */ 684 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 685 sizeof(struct icmp6_hdr) + 4 + maxhlen; 686 nicmp6->icmp6_type = ICMP6_WRUREPLY; 687 nicmp6->icmp6_code = 0; 688 } 689 #undef hostnamelen 690 if (n) { 691 icmp6stat.icp6s_reflect++; 692 icmp6stat.icp6s_outhist[ICMP6_WRUREPLY]++; 693 icmp6_reflect(n, noff); 694 } 695 break; 696 } 697 698 case ICMP6_WRUREPLY: 699 if (code != 0) 700 goto badcode; 701 break; 702 703 case ND_ROUTER_SOLICIT: 704 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routersolicit); 705 if (code != 0) 706 goto badcode; 707 if (icmp6len < sizeof(struct nd_router_solicit)) 708 goto badlen; 709 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 710 /* give up local */ 711 nd6_rs_input(m, off, icmp6len); 712 m = NULL; 713 goto freeit; 714 } 715 nd6_rs_input(n, off, icmp6len); 716 /* m stays. */ 717 break; 718 719 case ND_ROUTER_ADVERT: 720 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routeradvert); 721 if (code != 0) 722 goto badcode; 723 if (icmp6len < sizeof(struct nd_router_advert)) 724 goto badlen; 725 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 726 /* give up local */ 727 nd6_ra_input(m, off, icmp6len); 728 m = NULL; 729 goto freeit; 730 } 731 nd6_ra_input(n, off, icmp6len); 732 /* m stays. */ 733 break; 734 735 case ND_NEIGHBOR_SOLICIT: 736 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighborsolicit); 737 if (code != 0) 738 goto badcode; 739 if (icmp6len < sizeof(struct nd_neighbor_solicit)) 740 goto badlen; 741 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 742 /* give up local */ 743 nd6_ns_input(m, off, icmp6len); 744 m = NULL; 745 goto freeit; 746 } 747 nd6_ns_input(n, off, icmp6len); 748 /* m stays. */ 749 break; 750 751 case ND_NEIGHBOR_ADVERT: 752 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighboradvert); 753 if (code != 0) 754 goto badcode; 755 if (icmp6len < sizeof(struct nd_neighbor_advert)) 756 goto badlen; 757 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 758 /* give up local */ 759 nd6_na_input(m, off, icmp6len); 760 m = NULL; 761 goto freeit; 762 } 763 nd6_na_input(n, off, icmp6len); 764 /* m stays. */ 765 break; 766 767 case ND_REDIRECT: 768 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_redirect); 769 if (code != 0) 770 goto badcode; 771 if (icmp6len < sizeof(struct nd_redirect)) 772 goto badlen; 773 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 774 /* give up local */ 775 icmp6_redirect_input(m, off); 776 m = NULL; 777 goto freeit; 778 } 779 icmp6_redirect_input(n, off); 780 /* m stays. */ 781 break; 782 783 case ICMP6_ROUTER_RENUMBERING: 784 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND && 785 code != ICMP6_ROUTER_RENUMBERING_RESULT) 786 goto badcode; 787 if (icmp6len < sizeof(struct icmp6_router_renum)) 788 goto badlen; 789 break; 790 791 default: 792 printf("icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n", 793 icmp6->icmp6_type, ip6_sprintf(&ip6->ip6_src), 794 ip6_sprintf(&ip6->ip6_dst), 795 m->m_pkthdr.rcvif ? m->m_pkthdr.rcvif->if_index : 0); 796 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) { 797 /* ICMPv6 error: MUST deliver it by spec... */ 798 code = PRC_NCMDS; 799 /* deliver */ 800 } else { 801 /* ICMPv6 informational: MUST not deliver */ 802 break; 803 } 804 deliver: 805 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) { 806 icmp6stat.icp6s_tooshort++; 807 goto freeit; 808 } 809 #ifndef PULLDOWN_TEST 810 IP6_EXTHDR_CHECK(m, off, 811 sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr), 812 IPPROTO_DONE); 813 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 814 #else 815 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 816 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 817 if (icmp6 == NULL) { 818 icmp6stat.icp6s_tooshort++; 819 return IPPROTO_DONE; 820 } 821 #endif 822 bzero(&icmp6src, sizeof(icmp6src)); 823 icmp6src.sin6_len = sizeof(struct sockaddr_in6); 824 icmp6src.sin6_family = AF_INET6; 825 icmp6src.sin6_addr = ((struct ip6_hdr *)(icmp6 + 1))->ip6_dst; 826 827 /* Detect the upper level protocol */ 828 { 829 void (*ctlfunc) __P((int, struct sockaddr *, void *)); 830 struct ip6_hdr *eip6 = (struct ip6_hdr *)(icmp6 + 1); 831 u_int8_t nxt = eip6->ip6_nxt; 832 int eoff = off + sizeof(struct icmp6_hdr) + 833 sizeof(struct ip6_hdr); 834 struct ip6ctlparam ip6cp; 835 struct in6_addr *finaldst = NULL; 836 int icmp6type = icmp6->icmp6_type; 837 struct ip6_frag *fh; 838 struct ip6_rthdr *rth; 839 struct ip6_rthdr0 *rth0; 840 int rthlen; 841 842 while (1) { /* XXX: should avoid inf. loop explicitly? */ 843 struct ip6_ext *eh; 844 845 switch(nxt) { 846 case IPPROTO_HOPOPTS: 847 case IPPROTO_DSTOPTS: 848 case IPPROTO_AH: 849 #ifndef PULLDOWN_TEST 850 IP6_EXTHDR_CHECK(m, 0, eoff + 851 sizeof(struct ip6_ext), 852 IPPROTO_DONE); 853 eh = (struct ip6_ext *)(mtod(m, caddr_t) 854 + eoff); 855 #else 856 IP6_EXTHDR_GET(eh, struct ip6_ext *, m, 857 eoff, sizeof(*eh)); 858 if (eh == NULL) { 859 icmp6stat.icp6s_tooshort++; 860 return IPPROTO_DONE; 861 } 862 #endif 863 864 if (nxt == IPPROTO_AH) 865 eoff += (eh->ip6e_len + 2) << 2; 866 else 867 eoff += (eh->ip6e_len + 1) << 3; 868 nxt = eh->ip6e_nxt; 869 break; 870 case IPPROTO_ROUTING: 871 /* 872 * When the erroneous packet contains a 873 * routing header, we should examine the 874 * header to determine the final destination. 875 * Otherwise, we can't properly update 876 * information that depends on the final 877 * destination (e.g. path MTU). 878 */ 879 #ifndef PULLDOWN_TEST 880 IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(*rth), 881 IPPROTO_DONE); 882 rth = (struct ip6_rthdr *)(mtod(m, caddr_t) 883 + eoff); 884 #else 885 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m, 886 eoff, sizeof(*rth)); 887 if (rth == NULL) { 888 icmp6stat.icp6s_tooshort++; 889 return IPPROTO_DONE; 890 } 891 #endif 892 rthlen = (rth->ip6r_len + 1) << 3; 893 /* 894 * XXX: currently there is no 895 * officially defined type other 896 * than type-0. 897 * Note that if the segment left field 898 * is 0, all intermediate hops must 899 * have been passed. 900 */ 901 if (rth->ip6r_segleft && 902 rth->ip6r_type == IPV6_RTHDR_TYPE_0) { 903 int hops; 904 905 #ifndef PULLDOWN_TEST 906 IP6_EXTHDR_CHECK(m, 0, eoff + rthlen, 907 IPPROTO_DONE); 908 rth0 = (struct ip6_rthdr0 *)(mtod(m, caddr_t) + eoff); 909 #else 910 IP6_EXTHDR_GET(rth0, 911 struct ip6_rthdr0 *, m, 912 eoff, rthlen); 913 if (rth0 == NULL) { 914 icmp6stat.icp6s_tooshort++; 915 return IPPROTO_DONE; 916 } 917 #endif 918 /* just ignore a bogus header */ 919 if ((rth0->ip6r0_len % 2) == 0 && 920 (hops = rth0->ip6r0_len/2)) 921 finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1); 922 } 923 eoff += rthlen; 924 nxt = rth->ip6r_nxt; 925 break; 926 case IPPROTO_FRAGMENT: 927 #ifndef PULLDOWN_TEST 928 IP6_EXTHDR_CHECK(m, 0, eoff + 929 sizeof(struct ip6_frag), 930 IPPROTO_DONE); 931 fh = (struct ip6_frag *)(mtod(m, caddr_t) 932 + eoff); 933 #else 934 IP6_EXTHDR_GET(fh, struct ip6_frag *, m, 935 eoff, sizeof(*fh)); 936 if (fh == NULL) { 937 icmp6stat.icp6s_tooshort++; 938 return IPPROTO_DONE; 939 } 940 #endif 941 /* 942 * Data after a fragment header is meaningless 943 * unless it is the first fragment, but 944 * we'll go to the notify label for path MTU 945 * discovery. 946 */ 947 if (fh->ip6f_offlg & IP6F_OFF_MASK) 948 goto notify; 949 950 eoff += sizeof(struct ip6_frag); 951 nxt = fh->ip6f_nxt; 952 break; 953 default: 954 /* 955 * This case includes ESP and the No Next 956 * Header. In such cases going to the notify 957 * label does not have any meaning 958 * (i.e. ctlfunc will be NULL), but we go 959 * anyway since we might have to update 960 * path MTU information. 961 */ 962 goto notify; 963 } 964 } 965 notify: 966 #ifndef PULLDOWN_TEST 967 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 968 #else 969 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 970 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 971 if (icmp6 == NULL) { 972 icmp6stat.icp6s_tooshort++; 973 return IPPROTO_DONE; 974 } 975 #endif 976 if (icmp6type == ICMP6_PACKET_TOO_BIG) { 977 if (finaldst == NULL) 978 finaldst = &((struct ip6_hdr *)(icmp6 + 1))->ip6_dst; 979 icmp6_mtudisc_update(finaldst, icmp6, m); 980 } 981 982 ctlfunc = (void (*) __P((int, struct sockaddr *, void *))) 983 (inet6sw[ip6_protox[nxt]].pr_ctlinput); 984 if (ctlfunc) { 985 ip6cp.ip6c_m = m; 986 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1); 987 ip6cp.ip6c_off = eoff; 988 (*ctlfunc)(code, (struct sockaddr *)&icmp6src, &ip6cp); 989 } 990 } 991 break; 992 993 badcode: 994 icmp6stat.icp6s_badcode++; 995 break; 996 997 badlen: 998 icmp6stat.icp6s_badlen++; 999 break; 1000 } 1001 1002 icmp6_rip6_input(&m, *offp); 1003 return IPPROTO_DONE; 1004 1005 freeit: 1006 m_freem(m); 1007 return IPPROTO_DONE; 1008 } 1009 1010 static void 1011 icmp6_mtudisc_update(dst, icmp6, m) 1012 struct in6_addr *dst; 1013 struct icmp6_hdr *icmp6;/* we can assume the validity of the pointer */ 1014 struct mbuf *m; /* currently unused but added for scoped addrs */ 1015 { 1016 u_int mtu = ntohl(icmp6->icmp6_mtu); 1017 struct rtentry *rt = NULL; 1018 struct sockaddr_in6 sin6; 1019 1020 bzero(&sin6, sizeof(sin6)); 1021 sin6.sin6_family = PF_INET6; 1022 sin6.sin6_len = sizeof(struct sockaddr_in6); 1023 sin6.sin6_addr = *dst; 1024 /* sin6.sin6_scope_id = XXX: should be set if DST is a scoped addr */ 1025 rt = rtalloc1((struct sockaddr *)&sin6, 1); /*clone*/ 1026 if (!rt || (rt->rt_flags & RTF_HOST) == 0) { 1027 if (rt) 1028 RTFREE(rt); 1029 rt = icmp6_mtudisc_clone((struct sockaddr *)&sin6); 1030 } 1031 1032 if (rt && (rt->rt_flags & RTF_HOST) 1033 && !(rt->rt_rmx.rmx_locks & RTV_MTU)) { 1034 if (mtu < IPV6_MMTU) { 1035 /* xxx */ 1036 rt->rt_rmx.rmx_locks |= RTV_MTU; 1037 } else if (mtu < rt->rt_ifp->if_mtu && 1038 rt->rt_rmx.rmx_mtu > mtu) { 1039 rt->rt_rmx.rmx_mtu = mtu; 1040 } 1041 } 1042 if (rt) 1043 RTFREE(rt); 1044 } 1045 1046 /* 1047 * Process a Node Information Query packet, (roughly) based on 1048 * draft-ietf-ipngwg-icmp-name-lookups-05. 1049 * 1050 * Spec incompatibilities: 1051 * - IPv6 Subject address handling 1052 * - IPv4 Subject address handling support missing 1053 * - Proxy reply (answer even if it's not for me) 1054 * - "Supported Qtypes" support missing 1055 * - joins NI group address at in6_ifattach() time only, does not cope 1056 * with hostname changes by sethostname(3) 1057 */ 1058 #ifndef offsetof /* XXX */ 1059 #define offsetof(type, member) ((size_t)(&((type *)0)->member)) 1060 #endif 1061 static struct mbuf * 1062 ni6_input(m, off) 1063 struct mbuf *m; 1064 int off; 1065 { 1066 struct icmp6_nodeinfo *ni6, *nni6; 1067 struct mbuf *n = NULL; 1068 u_int16_t qtype; 1069 int subjlen; 1070 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1071 struct ni_reply_fqdn *fqdn; 1072 int addrs; /* for NI_QTYPE_NODEADDR */ 1073 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */ 1074 struct sockaddr_in6 sin6; 1075 struct ip6_hdr *ip6; 1076 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */ 1077 char *subj; 1078 1079 ip6 = mtod(m, struct ip6_hdr *); 1080 #ifndef PULLDOWN_TEST 1081 ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off); 1082 #else 1083 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6)); 1084 if (ni6 == NULL) { 1085 /* m is already reclaimed */ 1086 return NULL; 1087 } 1088 #endif 1089 1090 /* 1091 * Validate IPv6 destination address. 1092 * 1093 * We accept packets with the following IPv6 destination address: 1094 * - Responder's unicast/anycast address, 1095 * - link-local multicast address 1096 * This is a violation to last paragraph in icmp-name-lookups-05 1097 * page 4, which restricts IPv6 destination address of a query to: 1098 * - Responder's unicast/anycast address, 1099 * - NI group address for a name belongs to the Responder, or 1100 * - NI group address for a name for which the Responder is providing 1101 * proxy service. 1102 * (note: NI group address is a link-local multicast address) 1103 * 1104 * We allow any link-local multicast address, since "ping6 -w ff02::1" 1105 * has been really useful for us debugging our network. Also this is 1106 * still questionable if the restriction in spec buy us security at all, 1107 * since RFC2463 permits echo packet to multicast destination. 1108 * Even if we forbid NI query to ff02::1, we can effectively get the 1109 * same result as "ping6 -w ff02::1" by the following steps: 1110 * - run "ping6 ff02::1", then 1111 * - run "ping6 -w" for all addresses replied. 1112 */ 1113 bzero(&sin6, sizeof(sin6)); 1114 sin6.sin6_family = AF_INET6; 1115 sin6.sin6_len = sizeof(struct sockaddr_in6); 1116 bcopy(&ip6->ip6_dst, &sin6.sin6_addr, sizeof(sin6.sin6_addr)); 1117 /* XXX scopeid */ 1118 if (ifa_ifwithaddr((struct sockaddr *)&sin6)) 1119 ; /*unicast/anycast, fine*/ 1120 else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr)) 1121 ; /*violates spec slightly, see above*/ 1122 else 1123 goto bad; 1124 1125 /* guess reply length */ 1126 qtype = ntohs(ni6->ni_qtype); 1127 switch (qtype) { 1128 case NI_QTYPE_NOOP: 1129 break; /* no reply data */ 1130 case NI_QTYPE_SUPTYPES: 1131 goto bad; /* xxx: to be implemented */ 1132 break; 1133 case NI_QTYPE_FQDN: 1134 /* XXX will append a mbuf */ 1135 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1136 break; 1137 case NI_QTYPE_NODEADDR: 1138 addrs = ni6_addrs(ni6, m, &ifp); 1139 if ((replylen += addrs * sizeof(struct in6_addr)) > MCLBYTES) 1140 replylen = MCLBYTES; /* XXX: we'll truncate later */ 1141 break; 1142 default: 1143 /* 1144 * XXX: We must return a reply with the ICMP6 code 1145 * `unknown Qtype' in this case. However we regard the case 1146 * as an FQDN query for backward compatibility. 1147 * Older versions set a random value to this field, 1148 * so it rarely varies in the defined qtypes. 1149 * But the mechanism is not reliable... 1150 * maybe we should obsolete older versions. 1151 */ 1152 qtype = NI_QTYPE_FQDN; 1153 /* XXX will append a mbuf */ 1154 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1155 oldfqdn++; 1156 break; 1157 } 1158 1159 /* validate query Subject field. */ 1160 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo); 1161 switch (qtype) { 1162 case NI_QTYPE_NOOP: 1163 case NI_QTYPE_SUPTYPES: 1164 if (subjlen != 0) 1165 goto bad; 1166 break; 1167 1168 case NI_QTYPE_FQDN: 1169 case NI_QTYPE_NODEADDR: 1170 switch (ni6->ni_code) { 1171 case ICMP6_NI_SUBJ_IPV6: 1172 #if ICMP6_NI_SUBJ_IPV6 != 0 1173 case 0: 1174 #endif 1175 /* 1176 * backward compatibility - try to accept 03 draft 1177 * format, where no Subject is present. 1178 */ 1179 if (subjlen == 0) { 1180 oldfqdn++; 1181 break; 1182 } 1183 1184 if (subjlen != sizeof(sin6.sin6_addr)) 1185 goto bad; 1186 1187 /* 1188 * Validate Subject address. 1189 * 1190 * Not sure what exactly does "address belongs to the 1191 * node" mean in the spec, is it just unicast, or what? 1192 * 1193 * At this moment we consider Subject address as 1194 * "belong to the node" if the Subject address equals 1195 * to the IPv6 destination address; validation for 1196 * IPv6 destination address should have done enough 1197 * check for us. 1198 * 1199 * We do not do proxy at this moment. 1200 */ 1201 /* m_pulldown instead of copy? */ 1202 m_copydata(m, off + sizeof(struct icmp6_nodeinfo), 1203 subjlen, (caddr_t)&sin6.sin6_addr); 1204 /* XXX kame scope hack */ 1205 if (IN6_IS_SCOPE_LINKLOCAL(&sin6.sin6_addr)) { 1206 #ifdef FAKE_LOOPBACK_IF 1207 if ((m->m_flags & M_PKTHDR) != 0 && 1208 m->m_pkthdr.rcvif) { 1209 sin6.sin6_addr.s6_addr16[1] = 1210 htons(m->m_pkthdr.rcvif->if_index); 1211 } 1212 #else 1213 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 1214 sin6.sin6_addr.s6_addr16[1] = 1215 ip6->ip6_dst.s6_addr16[1]; 1216 } 1217 #endif 1218 } 1219 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &sin6.sin6_addr)) 1220 break; 1221 /* 1222 * XXX if we are to allow other cases, we should really 1223 * be careful about scope here. 1224 * basically, we should disallow queries toward IPv6 1225 * destination X with subject Y, if scope(X) > scope(Y). 1226 * if we allow scope(X) > scope(Y), it will result in 1227 * information leakage across scope boundary. 1228 */ 1229 goto bad; 1230 1231 case ICMP6_NI_SUBJ_FQDN: 1232 /* 1233 * Validate Subject name with gethostname(3). 1234 * 1235 * The behavior may need some debate, since: 1236 * - we are not sure if the node has FQDN as 1237 * hostname (returned by gethostname(3)). 1238 * - the code does wildcard match for truncated names. 1239 * however, we are not sure if we want to perform 1240 * wildcard match, if gethostname(3) side has 1241 * truncated hostname. 1242 */ 1243 n = ni6_nametodns(hostname, hostnamelen, 0); 1244 if (!n || n->m_next || n->m_len == 0) 1245 goto bad; 1246 IP6_EXTHDR_GET(subj, char *, m, 1247 off + sizeof(struct icmp6_nodeinfo), subjlen); 1248 if (subj == NULL) 1249 goto bad; 1250 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *), 1251 n->m_len)) { 1252 goto bad; 1253 } 1254 m_freem(n); 1255 n = NULL; 1256 break; 1257 1258 case ICMP6_NI_SUBJ_IPV4: /* xxx: to be implemented? */ 1259 default: 1260 goto bad; 1261 } 1262 break; 1263 1264 default: 1265 /* should never be here due to "switch (qtype)" above */ 1266 goto bad; 1267 } 1268 1269 /* allocate a mbuf to reply. */ 1270 MGETHDR(n, M_DONTWAIT, m->m_type); 1271 if (n == NULL) { 1272 m_freem(m); 1273 return(NULL); 1274 } 1275 M_COPY_PKTHDR(n, m); /* just for recvif */ 1276 if (replylen > MHLEN) { 1277 if (replylen > MCLBYTES) { 1278 /* 1279 * XXX: should we try to allocate more? But MCLBYTES is 1280 * probably much larger than IPV6_MMTU... 1281 */ 1282 goto bad; 1283 } 1284 MCLGET(n, M_DONTWAIT); 1285 if ((n->m_flags & M_EXT) == 0) { 1286 goto bad; 1287 } 1288 } 1289 n->m_pkthdr.len = n->m_len = replylen; 1290 1291 /* copy mbuf header and IPv6 + Node Information base headers */ 1292 bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr)); 1293 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1); 1294 bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo)); 1295 1296 /* qtype dependent procedure */ 1297 switch (qtype) { 1298 case NI_QTYPE_NOOP: 1299 nni6->ni_flags = 0; 1300 break; 1301 case NI_QTYPE_SUPTYPES: 1302 goto bad; /* xxx: to be implemented */ 1303 break; 1304 case NI_QTYPE_FQDN: 1305 fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) + 1306 sizeof(struct ip6_hdr) + 1307 sizeof(struct icmp6_nodeinfo)); 1308 nni6->ni_flags = 0; /* XXX: meaningless TTL */ 1309 fqdn->ni_fqdn_ttl = 0; /* ditto. */ 1310 /* 1311 * XXX do we really have FQDN in variable "hostname"? 1312 */ 1313 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn); 1314 if (n->m_next == NULL) 1315 goto bad; 1316 /* XXX we assume that n->m_next is not a chain */ 1317 if (n->m_next->m_next != NULL) 1318 goto bad; 1319 n->m_pkthdr.len += n->m_next->m_len; 1320 break; 1321 case NI_QTYPE_NODEADDR: 1322 { 1323 int lenlim, copied; 1324 1325 if (n->m_flags & M_EXT) 1326 lenlim = MCLBYTES - sizeof(struct ip6_hdr) - 1327 sizeof(struct icmp6_nodeinfo); 1328 else 1329 lenlim = MHLEN - sizeof(struct ip6_hdr) - 1330 sizeof(struct icmp6_nodeinfo); 1331 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim); 1332 /* XXX: reset mbuf length */ 1333 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 1334 sizeof(struct icmp6_nodeinfo) + copied; 1335 break; 1336 } 1337 default: 1338 break; /* XXX impossible! */ 1339 } 1340 1341 nni6->ni_type = ICMP6_NI_REPLY; 1342 nni6->ni_code = ICMP6_NI_SUCESS; 1343 m_freem(m); 1344 return(n); 1345 1346 bad: 1347 m_freem(m); 1348 if (n) 1349 m_freem(n); 1350 return(NULL); 1351 } 1352 #undef hostnamelen 1353 1354 /* 1355 * make a mbuf with DNS-encoded string. no compression support. 1356 * 1357 * XXX names with less than 2 dots (like "foo" or "foo.section") will be 1358 * treated as truncated name (two \0 at the end). this is a wild guess. 1359 */ 1360 static struct mbuf * 1361 ni6_nametodns(name, namelen, old) 1362 const char *name; 1363 int namelen; 1364 int old; /* return pascal string if non-zero */ 1365 { 1366 struct mbuf *m; 1367 char *cp, *ep; 1368 const char *p, *q; 1369 int i, len, nterm; 1370 1371 if (old) 1372 len = namelen + 1; 1373 else 1374 len = MCLBYTES; 1375 1376 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */ 1377 MGET(m, M_DONTWAIT, MT_DATA); 1378 if (m && len > MLEN) { 1379 MCLGET(m, M_DONTWAIT); 1380 if ((m->m_flags & M_EXT) == 0) 1381 goto fail; 1382 } 1383 if (!m) 1384 goto fail; 1385 m->m_next = NULL; 1386 1387 if (old) { 1388 m->m_len = len; 1389 *mtod(m, char *) = namelen; 1390 bcopy(name, mtod(m, char *) + 1, namelen); 1391 return m; 1392 } else { 1393 m->m_len = 0; 1394 cp = mtod(m, char *); 1395 ep = mtod(m, char *) + M_TRAILINGSPACE(m); 1396 1397 /* if not certain about my name, return empty buffer */ 1398 if (namelen == 0) 1399 return m; 1400 1401 /* 1402 * guess if it looks like shortened hostname, or FQDN. 1403 * shortened hostname needs two trailing "\0". 1404 */ 1405 i = 0; 1406 for (p = name; p < name + namelen; p++) { 1407 if (*p && *p == '.') 1408 i++; 1409 } 1410 if (i < 2) 1411 nterm = 2; 1412 else 1413 nterm = 1; 1414 1415 p = name; 1416 while (cp < ep && p < name + namelen) { 1417 i = 0; 1418 for (q = p; q < name + namelen && *q && *q != '.'; q++) 1419 i++; 1420 /* result does not fit into mbuf */ 1421 if (cp + i + 1 >= ep) 1422 goto fail; 1423 /* DNS label length restriction, RFC1035 page 8 */ 1424 if (i >= 64) 1425 goto fail; 1426 *cp++ = i; 1427 bcopy(p, cp, i); 1428 cp += i; 1429 p = q; 1430 if (p < name + namelen && *p == '.') 1431 p++; 1432 } 1433 /* termination */ 1434 if (cp + nterm >= ep) 1435 goto fail; 1436 while (nterm-- > 0) 1437 *cp++ = '\0'; 1438 m->m_len = cp - mtod(m, char *); 1439 return m; 1440 } 1441 1442 panic("should not reach here"); 1443 /*NOTREACHED*/ 1444 1445 fail: 1446 if (m) 1447 m_freem(m); 1448 return NULL; 1449 } 1450 1451 /* 1452 * check if two DNS-encoded string matches. takes care of truncated 1453 * form (with \0\0 at the end). no compression support. 1454 */ 1455 static int 1456 ni6_dnsmatch(a, alen, b, blen) 1457 const char *a; 1458 int alen; 1459 const char *b; 1460 int blen; 1461 { 1462 const char *a0, *b0; 1463 int l; 1464 1465 /* simplest case - need validation? */ 1466 if (alen == blen && bcmp(a, b, alen) == 0) 1467 return 1; 1468 1469 a0 = a; 1470 b0 = b; 1471 1472 /* termination is mandatory */ 1473 if (alen < 2 || blen < 2) 1474 return 0; 1475 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0') 1476 return 0; 1477 alen--; 1478 blen--; 1479 1480 while (a - a0 < alen && b - b0 < blen) { 1481 if (a - a0 + 1 > alen || b - b0 + 1 > blen) 1482 return 0; 1483 1484 if ((signed char)a[0] < 0 || (signed char)b[0] < 0) 1485 return 0; 1486 /* we don't support compression yet */ 1487 if (a[0] >= 64 || b[0] >= 64) 1488 return 0; 1489 1490 /* truncated case */ 1491 if (a[0] == 0 && a - a0 == alen - 1) 1492 return 1; 1493 if (b[0] == 0 && b - b0 == blen - 1) 1494 return 1; 1495 if (a[0] == 0 || b[0] == 0) 1496 return 0; 1497 1498 if (a[0] != b[0]) 1499 return 0; 1500 l = a[0]; 1501 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen) 1502 return 0; 1503 if (bcmp(a + 1, b + 1, l) != 0) 1504 return 0; 1505 1506 a += 1 + l; 1507 b += 1 + l; 1508 } 1509 1510 if (a - a0 == alen && b - b0 == blen) 1511 return 1; 1512 else 1513 return 0; 1514 } 1515 1516 /* 1517 * calculate the number of addresses to be returned in the node info reply. 1518 */ 1519 static int 1520 ni6_addrs(ni6, m, ifpp) 1521 struct icmp6_nodeinfo *ni6; 1522 struct mbuf *m; 1523 struct ifnet **ifpp; 1524 { 1525 register struct ifnet *ifp; 1526 register struct in6_ifaddr *ifa6; 1527 register struct ifaddr *ifa; 1528 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1529 int addrs = 0, addrsofif, iffound = 0; 1530 1531 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) 1532 { 1533 addrsofif = 0; 1534 for (ifa = ifp->if_addrlist.tqh_first; ifa; 1535 ifa = ifa->ifa_list.tqe_next) 1536 { 1537 if (ifa->ifa_addr->sa_family != AF_INET6) 1538 continue; 1539 ifa6 = (struct in6_ifaddr *)ifa; 1540 1541 if (!(ni6->ni_flags & NI_NODEADDR_FLAG_ALL) && 1542 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 1543 &ifa6->ia_addr.sin6_addr)) 1544 iffound = 1; 1545 1546 /* 1547 * IPv4-mapped addresses can only be returned by a 1548 * Node Information proxy, since they represent 1549 * addresses of IPv4-only nodes, which perforce do 1550 * not implement this protocol. 1551 * [icmp-name-lookups-05] 1552 * So we don't support NI_NODEADDR_FLAG_COMPAT in 1553 * this function at this moment. 1554 */ 1555 1556 if (ifa6->ia6_flags & IN6_IFF_ANYCAST) 1557 continue; /* we need only unicast addresses */ 1558 1559 if ((ni6->ni_flags & (NI_NODEADDR_FLAG_LINKLOCAL | 1560 NI_NODEADDR_FLAG_SITELOCAL | 1561 NI_NODEADDR_FLAG_GLOBAL)) == 0) 1562 continue; 1563 1564 /* What do we have to do about ::1? */ 1565 switch(in6_addrscope(&ifa6->ia_addr.sin6_addr)) { 1566 case IPV6_ADDR_SCOPE_LINKLOCAL: 1567 if (ni6->ni_flags & NI_NODEADDR_FLAG_LINKLOCAL) 1568 addrsofif++; 1569 break; 1570 case IPV6_ADDR_SCOPE_SITELOCAL: 1571 if (ni6->ni_flags & NI_NODEADDR_FLAG_SITELOCAL) 1572 addrsofif++; 1573 break; 1574 case IPV6_ADDR_SCOPE_GLOBAL: 1575 if (ni6->ni_flags & NI_NODEADDR_FLAG_GLOBAL) 1576 addrsofif++; 1577 break; 1578 default: 1579 continue; 1580 } 1581 } 1582 if (iffound) { 1583 *ifpp = ifp; 1584 return(addrsofif); 1585 } 1586 1587 addrs += addrsofif; 1588 } 1589 1590 return(addrs); 1591 } 1592 1593 static int 1594 ni6_store_addrs(ni6, nni6, ifp0, resid) 1595 struct icmp6_nodeinfo *ni6, *nni6; 1596 struct ifnet *ifp0; 1597 int resid; 1598 { 1599 register struct ifnet *ifp = ifp0 ? ifp0 : TAILQ_FIRST(&ifnet); 1600 register struct in6_ifaddr *ifa6; 1601 register struct ifaddr *ifa; 1602 int docopy, copied = 0; 1603 u_char *cp = (u_char *)(nni6 + 1); 1604 1605 if (ifp0 == NULL && !(ni6->ni_flags & NI_NODEADDR_FLAG_ALL)) 1606 return(0); /* needless to copy */ 1607 1608 for (; ifp; ifp = TAILQ_NEXT(ifp, if_list)) 1609 { 1610 for (ifa = ifp->if_addrlist.tqh_first; ifa; 1611 ifa = ifa->ifa_list.tqe_next) 1612 { 1613 docopy = 0; 1614 1615 if (ifa->ifa_addr->sa_family != AF_INET6) 1616 continue; 1617 ifa6 = (struct in6_ifaddr *)ifa; 1618 1619 if (ifa6->ia6_flags & IN6_IFF_ANYCAST) { 1620 /* just experimental. not in the spec. */ 1621 if (ni6->ni_flags & NI_NODEADDR_FLAG_ANYCAST) 1622 docopy = 1; 1623 else 1624 continue; 1625 } 1626 else { /* unicast address */ 1627 if (ni6->ni_flags & NI_NODEADDR_FLAG_ANYCAST) 1628 continue; 1629 else 1630 docopy = 1; 1631 } 1632 1633 /* What do we have to do about ::1? */ 1634 switch(in6_addrscope(&ifa6->ia_addr.sin6_addr)) { 1635 case IPV6_ADDR_SCOPE_LINKLOCAL: 1636 if (ni6->ni_flags & NI_NODEADDR_FLAG_LINKLOCAL) 1637 docopy = 1; 1638 break; 1639 case IPV6_ADDR_SCOPE_SITELOCAL: 1640 if (ni6->ni_flags & NI_NODEADDR_FLAG_SITELOCAL) 1641 docopy = 1; 1642 break; 1643 case IPV6_ADDR_SCOPE_GLOBAL: 1644 if (ni6->ni_flags & NI_NODEADDR_FLAG_GLOBAL) 1645 docopy = 1; 1646 break; 1647 default: 1648 continue; 1649 } 1650 1651 if (docopy) { 1652 if (resid < sizeof(struct in6_addr)) { 1653 /* 1654 * We give up much more copy. 1655 * Set the truncate flag and return. 1656 */ 1657 nni6->ni_flags |= 1658 NI_NODEADDR_FLAG_TRUNCATE; 1659 return(copied); 1660 } 1661 bcopy(&ifa6->ia_addr.sin6_addr, cp, 1662 sizeof(struct in6_addr)); 1663 /* XXX: KAME link-local hack; remove ifindex */ 1664 if (IN6_IS_ADDR_LINKLOCAL(&ifa6->ia_addr.sin6_addr)) 1665 ((struct in6_addr *)cp)->s6_addr16[1] = 0; 1666 cp += sizeof(struct in6_addr); 1667 resid -= sizeof(struct in6_addr); 1668 copied += sizeof(struct in6_addr); 1669 } 1670 } 1671 if (ifp0) /* we need search only on the specified IF */ 1672 break; 1673 } 1674 1675 return(copied); 1676 } 1677 1678 /* 1679 * XXX almost dup'ed code with rip6_input. 1680 */ 1681 static int 1682 icmp6_rip6_input(mp, off) 1683 struct mbuf **mp; 1684 int off; 1685 { 1686 struct mbuf *m = *mp; 1687 register struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1688 register struct in6pcb *in6p; 1689 struct in6pcb *last = NULL; 1690 struct sockaddr_in6 rip6src; 1691 struct icmp6_hdr *icmp6; 1692 struct mbuf *opts = NULL; 1693 1694 #ifndef PULLDOWN_TEST 1695 /* this is assumed to be safe. */ 1696 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off); 1697 #else 1698 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 1699 if (icmp6 == NULL) { 1700 /* m is already reclaimed */ 1701 return IPPROTO_DONE; 1702 } 1703 #endif 1704 1705 bzero(&rip6src, sizeof(rip6src)); 1706 rip6src.sin6_len = sizeof(struct sockaddr_in6); 1707 rip6src.sin6_family = AF_INET6; 1708 /* KAME hack: recover scopeid */ 1709 (void)in6_recoverscope(&rip6src, &ip6->ip6_src, m->m_pkthdr.rcvif); 1710 1711 for (in6p = rawin6pcb.in6p_next; 1712 in6p != &rawin6pcb; in6p = in6p->in6p_next) 1713 { 1714 if (in6p->in6p_ip6_nxt != IPPROTO_ICMPV6) 1715 continue; 1716 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && 1717 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst)) 1718 continue; 1719 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) && 1720 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src)) 1721 continue; 1722 if (in6p->in6p_icmp6filt 1723 && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type, 1724 in6p->in6p_icmp6filt)) 1725 continue; 1726 if (last) { 1727 struct mbuf *n; 1728 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { 1729 if (last->in6p_flags & IN6P_CONTROLOPTS) 1730 ip6_savecontrol(last, &opts, ip6, n); 1731 /* strip intermediate headers */ 1732 m_adj(n, off); 1733 if (sbappendaddr(&last->in6p_socket->so_rcv, 1734 (struct sockaddr *)&rip6src, 1735 n, opts) == 0) { 1736 /* should notify about lost packet */ 1737 m_freem(n); 1738 if (opts) 1739 m_freem(opts); 1740 } else 1741 sorwakeup(last->in6p_socket); 1742 opts = NULL; 1743 } 1744 } 1745 last = in6p; 1746 } 1747 if (last) { 1748 if (last->in6p_flags & IN6P_CONTROLOPTS) 1749 ip6_savecontrol(last, &opts, ip6, m); 1750 /* strip intermediate headers */ 1751 m_adj(m, off); 1752 if (sbappendaddr(&last->in6p_socket->so_rcv, 1753 (struct sockaddr *)&rip6src, m, opts) == 0) { 1754 m_freem(m); 1755 if (opts) 1756 m_freem(opts); 1757 } else 1758 sorwakeup(last->in6p_socket); 1759 } else { 1760 m_freem(m); 1761 ip6stat.ip6s_delivered--; 1762 } 1763 return IPPROTO_DONE; 1764 } 1765 1766 /* 1767 * Reflect the ip6 packet back to the source. 1768 * OFF points to the icmp6 header, counted from the top of the mbuf. 1769 */ 1770 void 1771 icmp6_reflect(m, off) 1772 struct mbuf *m; 1773 size_t off; 1774 { 1775 struct ip6_hdr *ip6; 1776 struct icmp6_hdr *icmp6; 1777 struct in6_ifaddr *ia; 1778 struct in6_addr t, *src = 0; 1779 int plen; 1780 int type, code; 1781 struct ifnet *outif = NULL; 1782 #ifdef COMPAT_RFC1885 1783 int mtu = IPV6_MMTU; 1784 struct sockaddr_in6 *sin6 = &icmp6_reflect_rt.ro_dst; 1785 #endif 1786 1787 /* too short to reflect */ 1788 if (off < sizeof(struct ip6_hdr)) { 1789 printf("sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n", 1790 (u_long)off, (u_long)sizeof(struct ip6_hdr), 1791 __FILE__, __LINE__); 1792 goto bad; 1793 } 1794 1795 /* 1796 * If there are extra headers between IPv6 and ICMPv6, strip 1797 * off that header first. 1798 */ 1799 #ifdef DIAGNOSTIC 1800 if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN) 1801 panic("assumption failed in icmp6_reflect"); 1802 #endif 1803 if (off > sizeof(struct ip6_hdr)) { 1804 size_t l; 1805 struct ip6_hdr nip6; 1806 1807 l = off - sizeof(struct ip6_hdr); 1808 m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6); 1809 m_adj(m, l); 1810 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 1811 if (m->m_len < l) { 1812 if ((m = m_pullup(m, l)) == NULL) 1813 return; 1814 } 1815 bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6)); 1816 } else /* off == sizeof(struct ip6_hdr) */ { 1817 size_t l; 1818 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 1819 if (m->m_len < l) { 1820 if ((m = m_pullup(m, l)) == NULL) 1821 return; 1822 } 1823 } 1824 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr); 1825 ip6 = mtod(m, struct ip6_hdr *); 1826 ip6->ip6_nxt = IPPROTO_ICMPV6; 1827 icmp6 = (struct icmp6_hdr *)(ip6 + 1); 1828 type = icmp6->icmp6_type; /* keep type for statistics */ 1829 code = icmp6->icmp6_code; /* ditto. */ 1830 1831 t = ip6->ip6_dst; 1832 /* 1833 * ip6_input() drops a packet if its src is multicast. 1834 * So, the src is never multicast. 1835 */ 1836 ip6->ip6_dst = ip6->ip6_src; 1837 1838 /* XXX hack for link-local addresses */ 1839 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) 1840 ip6->ip6_dst.s6_addr16[1] = 1841 htons(m->m_pkthdr.rcvif->if_index); 1842 if (IN6_IS_ADDR_LINKLOCAL(&t)) 1843 t.s6_addr16[1] = htons(m->m_pkthdr.rcvif->if_index); 1844 1845 #ifdef COMPAT_RFC1885 1846 /* 1847 * xxx guess MTU 1848 * RFC 1885 requires that echo reply should be truncated if it 1849 * does not fit in with (return) path MTU, but the description was 1850 * removed in the new spec. 1851 */ 1852 if (icmp6_reflect_rt.ro_rt == 0 || 1853 ! (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &ip6->ip6_dst))) { 1854 if (icmp6_reflect_rt.ro_rt) { 1855 icmp6_reflect_rt.ro_rt = 0; 1856 } 1857 bzero(sin6, sizeof(*sin6)); 1858 sin6->sin6_family = PF_INET6; 1859 sin6->sin6_len = sizeof(struct sockaddr_in6); 1860 sin6->sin6_addr = ip6->ip6_dst; 1861 1862 rtalloc((struct route *)&icmp6_reflect_rt.ro_rt); 1863 } 1864 1865 if (icmp6_reflect_rt.ro_rt == 0) 1866 goto bad; 1867 1868 if ((icmp6_reflect_rt.ro_rt->rt_flags & RTF_HOST) 1869 && mtu < icmp6_reflect_rt.ro_rt->rt_ifp->if_mtu) 1870 mtu = icmp6_reflect_rt.ro_rt->rt_rmx.rmx_mtu; 1871 1872 if (mtu < m->m_pkthdr.len) { 1873 plen -= (m->m_pkthdr.len - mtu); 1874 m_adj(m, mtu - m->m_pkthdr.len); 1875 } 1876 #endif 1877 /* 1878 * If the incoming packet was addressed directly to us(i.e. unicast), 1879 * use dst as the src for the reply. 1880 * The IN6_IFF_NOTREADY case would be VERY rare, but is possible 1881 * (for example) when we encounter an error while forwarding procedure 1882 * destined to a duplicated address of ours. 1883 */ 1884 for (ia = in6_ifaddr; ia; ia = ia->ia_next) 1885 if (IN6_ARE_ADDR_EQUAL(&t, &ia->ia_addr.sin6_addr) && 1886 (ia->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) { 1887 src = &t; 1888 break; 1889 } 1890 if (ia == NULL && IN6_IS_ADDR_LINKLOCAL(&t) && (m->m_flags & M_LOOP)) { 1891 /* 1892 * This is the case if the dst is our link-local address 1893 * and the sender is also ourseleves. 1894 */ 1895 src = &t; 1896 } 1897 1898 if (src == 0) 1899 /* 1900 * This case matches to multicasts, our anycast, or unicasts 1901 * that we do not own. Select a source address which has the 1902 * same scope. 1903 * XXX: for (non link-local) multicast addresses, this might 1904 * not be a good choice. 1905 */ 1906 if ((ia = in6_ifawithscope(m->m_pkthdr.rcvif, &t)) != 0) 1907 src = &IA6_SIN6(ia)->sin6_addr; 1908 1909 if (src == 0) 1910 goto bad; 1911 1912 ip6->ip6_src = *src; 1913 1914 ip6->ip6_flow = 0; 1915 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 1916 ip6->ip6_vfc |= IPV6_VERSION; 1917 ip6->ip6_nxt = IPPROTO_ICMPV6; 1918 if (m->m_pkthdr.rcvif) { 1919 /* XXX: This may not be the outgoing interface */ 1920 ip6->ip6_hlim = nd_ifinfo[m->m_pkthdr.rcvif->if_index].chlim; 1921 } 1922 1923 icmp6->icmp6_cksum = 0; 1924 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6, 1925 sizeof(struct ip6_hdr), plen); 1926 1927 /* 1928 * xxx option handling 1929 */ 1930 1931 m->m_flags &= ~(M_BCAST|M_MCAST); 1932 #ifdef IPSEC 1933 /* Don't lookup socket */ 1934 ipsec_setsocket(m, NULL); 1935 #endif /*IPSEC*/ 1936 1937 #ifdef COMPAT_RFC1885 1938 ip6_output(m, NULL, &icmp6_reflect_rt, 0, NULL, &outif); 1939 #else 1940 ip6_output(m, NULL, NULL, 0, NULL, &outif); 1941 #endif 1942 if (outif) 1943 icmp6_ifoutstat_inc(outif, type, code); 1944 1945 return; 1946 1947 bad: 1948 m_freem(m); 1949 return; 1950 } 1951 1952 void 1953 icmp6_fasttimo() 1954 { 1955 1956 mld6_fasttimeo(); 1957 } 1958 1959 static const char * 1960 icmp6_redirect_diag(src6, dst6, tgt6) 1961 struct in6_addr *src6; 1962 struct in6_addr *dst6; 1963 struct in6_addr *tgt6; 1964 { 1965 static char buf[1024]; 1966 snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)", 1967 ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6)); 1968 return buf; 1969 } 1970 1971 void 1972 icmp6_redirect_input(m, off) 1973 register struct mbuf *m; 1974 int off; 1975 { 1976 struct ifnet *ifp = m->m_pkthdr.rcvif; 1977 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1978 struct nd_redirect *nd_rd; 1979 int icmp6len = ntohs(ip6->ip6_plen); 1980 char *lladdr = NULL; 1981 int lladdrlen = 0; 1982 u_char *redirhdr = NULL; 1983 int redirhdrlen = 0; 1984 struct rtentry *rt = NULL; 1985 int is_router; 1986 int is_onlink; 1987 struct in6_addr src6 = ip6->ip6_src; 1988 struct in6_addr redtgt6; 1989 struct in6_addr reddst6; 1990 union nd_opts ndopts; 1991 1992 if (!m || !ifp) 1993 return; 1994 1995 /* XXX if we are router, we don't update route by icmp6 redirect */ 1996 if (ip6_forwarding) 1997 goto freeit; 1998 if (!icmp6_rediraccept) 1999 goto freeit; 2000 2001 #ifndef PULLDOWN_TEST 2002 IP6_EXTHDR_CHECK(m, off, icmp6len,); 2003 nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off); 2004 #else 2005 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len); 2006 if (nd_rd == NULL) { 2007 icmp6stat.icp6s_tooshort++; 2008 return; 2009 } 2010 #endif 2011 redtgt6 = nd_rd->nd_rd_target; 2012 reddst6 = nd_rd->nd_rd_dst; 2013 2014 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 2015 redtgt6.s6_addr16[1] = htons(ifp->if_index); 2016 if (IN6_IS_ADDR_LINKLOCAL(&reddst6)) 2017 reddst6.s6_addr16[1] = htons(ifp->if_index); 2018 2019 /* validation */ 2020 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) { 2021 log(LOG_ERR, 2022 "ICMP6 redirect sent from %s rejected; " 2023 "must be from linklocal\n", ip6_sprintf(&src6)); 2024 goto freeit; 2025 } 2026 if (ip6->ip6_hlim != 255) { 2027 log(LOG_ERR, 2028 "ICMP6 redirect sent from %s rejected; " 2029 "hlim=%d (must be 255)\n", 2030 ip6_sprintf(&src6), ip6->ip6_hlim); 2031 goto freeit; 2032 } 2033 { 2034 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */ 2035 struct sockaddr_in6 sin6; 2036 struct in6_addr *gw6; 2037 2038 bzero(&sin6, sizeof(sin6)); 2039 sin6.sin6_family = AF_INET6; 2040 sin6.sin6_len = sizeof(struct sockaddr_in6); 2041 bcopy(&reddst6, &sin6.sin6_addr, sizeof(reddst6)); 2042 rt = rtalloc1((struct sockaddr *)&sin6, 0); 2043 if (rt) { 2044 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr); 2045 if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) { 2046 log(LOG_ERR, 2047 "ICMP6 redirect rejected; " 2048 "not equal to gw-for-src=%s (must be same): " 2049 "%s\n", 2050 ip6_sprintf(gw6), 2051 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); 2052 RTFREE(rt); 2053 goto freeit; 2054 } 2055 } else { 2056 log(LOG_ERR, 2057 "ICMP6 redirect rejected; " 2058 "no route found for redirect dst: %s\n", 2059 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); 2060 goto freeit; 2061 } 2062 RTFREE(rt); 2063 rt = NULL; 2064 } 2065 if (IN6_IS_ADDR_MULTICAST(&reddst6)) { 2066 log(LOG_ERR, 2067 "ICMP6 redirect rejected; " 2068 "redirect dst must be unicast: %s\n", 2069 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); 2070 goto freeit; 2071 } 2072 2073 is_router = is_onlink = 0; 2074 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 2075 is_router = 1; /* router case */ 2076 if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0) 2077 is_onlink = 1; /* on-link destination case */ 2078 if (!is_router && !is_onlink) { 2079 log(LOG_ERR, 2080 "ICMP6 redirect rejected; " 2081 "neither router case nor onlink case: %s\n", 2082 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); 2083 goto freeit; 2084 } 2085 /* validation passed */ 2086 2087 icmp6len -= sizeof(*nd_rd); 2088 nd6_option_init(nd_rd + 1, icmp6len, &ndopts); 2089 if (nd6_options(&ndopts) < 0) { 2090 log(LOG_INFO, "icmp6_redirect_input: " 2091 "invalid ND option, rejected: %s\n", 2092 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); 2093 goto freeit; 2094 } 2095 2096 if (ndopts.nd_opts_tgt_lladdr) { 2097 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 2098 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 2099 } 2100 2101 if (ndopts.nd_opts_rh) { 2102 redirhdrlen = ndopts.nd_opts_rh->nd_opt_rh_len; 2103 redirhdr = (u_char *)(ndopts.nd_opts_rh + 1); /* xxx */ 2104 } 2105 2106 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 2107 log(LOG_INFO, 2108 "icmp6_redirect_input: lladdrlen mismatch for %s " 2109 "(if %d, icmp6 packet %d): %s\n", 2110 ip6_sprintf(&redtgt6), ifp->if_addrlen, lladdrlen - 2, 2111 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); 2112 } 2113 2114 /* RFC 2461 8.3 */ 2115 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT, 2116 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER); 2117 2118 if (!is_onlink) { /* better router case. perform rtredirect. */ 2119 /* perform rtredirect */ 2120 struct sockaddr_in6 sdst; 2121 struct sockaddr_in6 sgw; 2122 struct sockaddr_in6 ssrc; 2123 2124 bzero(&sdst, sizeof(sdst)); 2125 bzero(&sgw, sizeof(sgw)); 2126 bzero(&ssrc, sizeof(ssrc)); 2127 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6; 2128 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len = 2129 sizeof(struct sockaddr_in6); 2130 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr)); 2131 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2132 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr)); 2133 rtredirect((struct sockaddr *)&sdst, (struct sockaddr *)&sgw, 2134 (struct sockaddr *)NULL, RTF_GATEWAY | RTF_HOST, 2135 (struct sockaddr *)&ssrc, 2136 (struct rtentry **)NULL 2137 ); 2138 } 2139 /* finally update cached route in each socket via pfctlinput */ 2140 { 2141 struct sockaddr_in6 sdst; 2142 #if 1 2143 #else 2144 struct ip6protosw *pr; 2145 #endif 2146 2147 bzero(&sdst, sizeof(sdst)); 2148 sdst.sin6_family = AF_INET6; 2149 sdst.sin6_len = sizeof(struct sockaddr_in6); 2150 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2151 #if 1 2152 pfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst); 2153 #else 2154 /* 2155 * do not use pfctlinput() here, we have different prototype for 2156 * xx_ctlinput() in ip6proto. 2157 */ 2158 for (pr = (struct ip6protosw *)inet6domain.dom_protosw; 2159 pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; 2160 pr++) { 2161 if (pr->pr_ctlinput) { 2162 (*pr->pr_ctlinput)(PRC_REDIRECT_HOST, 2163 (struct sockaddr *)&sdst, NULL, NULL, 0); 2164 } 2165 } 2166 #endif 2167 #ifdef IPSEC 2168 key_sa_routechange((struct sockaddr *)&sdst); 2169 #endif 2170 } 2171 2172 freeit: 2173 m_freem(m); 2174 } 2175 2176 void 2177 icmp6_redirect_output(m0, rt) 2178 struct mbuf *m0; 2179 struct rtentry *rt; 2180 { 2181 struct ifnet *ifp; /* my outgoing interface */ 2182 struct in6_addr *ifp_ll6; 2183 struct in6_addr *router_ll6; 2184 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */ 2185 struct mbuf *m = NULL; /* newly allocated one */ 2186 struct ip6_hdr *ip6; /* m as struct ip6_hdr */ 2187 struct nd_redirect *nd_rd; 2188 size_t maxlen; 2189 u_char *p; 2190 struct ifnet *outif = NULL; 2191 struct sockaddr_in6 src_sa; 2192 2193 icmp6_errcount(&icmp6stat.icp6s_outerrhist, ND_REDIRECT, 0); 2194 2195 /* if we are not router, we don't send icmp6 redirect */ 2196 if (!ip6_forwarding || ip6_accept_rtadv) 2197 goto fail; 2198 2199 /* sanity check */ 2200 if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp)) 2201 goto fail; 2202 2203 /* 2204 * Address check: 2205 * the source address must identify a neighbor, and 2206 * the destination address must not be a multicast address 2207 * [RFC 2461, sec 8.2] 2208 */ 2209 sip6 = mtod(m0, struct ip6_hdr *); 2210 bzero(&src_sa, sizeof(src_sa)); 2211 src_sa.sin6_family = AF_INET6; 2212 src_sa.sin6_len = sizeof(src_sa); 2213 src_sa.sin6_addr = sip6->ip6_src; 2214 /* we don't currently use sin6_scope_id, but eventually use it */ 2215 src_sa.sin6_scope_id = in6_addr2scopeid(ifp, &sip6->ip6_src); 2216 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0) 2217 goto fail; 2218 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst)) 2219 goto fail; /* what should we do here? */ 2220 2221 /* rate limit */ 2222 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0)) 2223 goto fail; 2224 2225 /* 2226 * Since we are going to append up to 1280 bytes (= IPV6_MMTU), 2227 * we almost always ask for an mbuf cluster for simplicity. 2228 * (MHLEN < IPV6_MMTU is almost always true) 2229 */ 2230 #if IPV6_MMTU >= MCLBYTES 2231 # error assumption failed about IPV6_MMTU and MCLBYTES 2232 #endif 2233 MGETHDR(m, M_DONTWAIT, MT_HEADER); 2234 if (m && IPV6_MMTU >= MHLEN) 2235 MCLGET(m, M_DONTWAIT); 2236 if (!m) 2237 goto fail; 2238 maxlen = (m->m_flags & M_EXT) ? MCLBYTES : MHLEN; 2239 maxlen = min(IPV6_MMTU, maxlen); 2240 /* just for safety */ 2241 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) + 2242 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) { 2243 goto fail; 2244 } 2245 2246 { 2247 /* get ip6 linklocal address for ifp(my outgoing interface). */ 2248 struct in6_ifaddr *ia; 2249 if ((ia = in6ifa_ifpforlinklocal(ifp, 2250 IN6_IFF_NOTREADY| 2251 IN6_IFF_ANYCAST)) == NULL) 2252 goto fail; 2253 ifp_ll6 = &ia->ia_addr.sin6_addr; 2254 } 2255 2256 /* get ip6 linklocal address for the router. */ 2257 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) { 2258 struct sockaddr_in6 *sin6; 2259 sin6 = (struct sockaddr_in6 *)rt->rt_gateway; 2260 router_ll6 = &sin6->sin6_addr; 2261 if (!IN6_IS_ADDR_LINKLOCAL(router_ll6)) 2262 router_ll6 = (struct in6_addr *)NULL; 2263 } else 2264 router_ll6 = (struct in6_addr *)NULL; 2265 2266 /* ip6 */ 2267 ip6 = mtod(m, struct ip6_hdr *); 2268 ip6->ip6_flow = 0; 2269 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2270 ip6->ip6_vfc |= IPV6_VERSION; 2271 /* ip6->ip6_plen will be set later */ 2272 ip6->ip6_nxt = IPPROTO_ICMPV6; 2273 ip6->ip6_hlim = 255; 2274 /* ip6->ip6_src must be linklocal addr for my outgoing if. */ 2275 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr)); 2276 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr)); 2277 2278 /* ND Redirect */ 2279 nd_rd = (struct nd_redirect *)(ip6 + 1); 2280 nd_rd->nd_rd_type = ND_REDIRECT; 2281 nd_rd->nd_rd_code = 0; 2282 nd_rd->nd_rd_reserved = 0; 2283 if (rt->rt_flags & RTF_GATEWAY) { 2284 /* 2285 * nd_rd->nd_rd_target must be a link-local address in 2286 * better router cases. 2287 */ 2288 if (!router_ll6) 2289 goto fail; 2290 bcopy(router_ll6, &nd_rd->nd_rd_target, 2291 sizeof(nd_rd->nd_rd_target)); 2292 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2293 sizeof(nd_rd->nd_rd_dst)); 2294 } else { 2295 /* make sure redtgt == reddst */ 2296 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target, 2297 sizeof(nd_rd->nd_rd_target)); 2298 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2299 sizeof(nd_rd->nd_rd_dst)); 2300 } 2301 2302 p = (u_char *)(nd_rd + 1); 2303 2304 if (!router_ll6) 2305 goto nolladdropt; 2306 2307 { 2308 /* target lladdr option */ 2309 struct rtentry *rt_router = NULL; 2310 int len; 2311 struct sockaddr_dl *sdl; 2312 struct nd_opt_hdr *nd_opt; 2313 char *lladdr; 2314 2315 rt_router = nd6_lookup(router_ll6, 0, ifp); 2316 if (!rt_router) 2317 goto nolladdropt; 2318 len = sizeof(*nd_opt) + ifp->if_addrlen; 2319 len = (len + 7) & ~7; /*round by 8*/ 2320 /* safety check */ 2321 if (len + (p - (u_char *)ip6) > maxlen) 2322 goto nolladdropt; 2323 if (!(rt_router->rt_flags & RTF_GATEWAY) && 2324 (rt_router->rt_flags & RTF_LLINFO) && 2325 (rt_router->rt_gateway->sa_family == AF_LINK) && 2326 (sdl = (struct sockaddr_dl *)rt_router->rt_gateway) && 2327 sdl->sdl_alen) { 2328 nd_opt = (struct nd_opt_hdr *)p; 2329 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 2330 nd_opt->nd_opt_len = len >> 3; 2331 lladdr = (char *)(nd_opt + 1); 2332 bcopy(LLADDR(sdl), lladdr, ifp->if_addrlen); 2333 p += len; 2334 } 2335 } 2336 nolladdropt:; 2337 2338 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2339 2340 /* just to be safe */ 2341 if (m0->m_flags & M_DECRYPTED) 2342 goto noredhdropt; 2343 if (p - (u_char *)ip6 > maxlen) 2344 goto noredhdropt; 2345 2346 { 2347 /* redirected header option */ 2348 int len; 2349 struct nd_opt_rd_hdr *nd_opt_rh; 2350 2351 /* 2352 * compute the maximum size for icmp6 redirect header option. 2353 * XXX room for auth header? 2354 */ 2355 len = maxlen - (p - (u_char *)ip6); 2356 len &= ~7; 2357 2358 /* This is just for simplicity. */ 2359 if (m0->m_pkthdr.len != m0->m_len) { 2360 if (m0->m_next) { 2361 m_freem(m0->m_next); 2362 m0->m_next = NULL; 2363 } 2364 m0->m_pkthdr.len = m0->m_len; 2365 } 2366 2367 /* 2368 * Redirected header option spec (RFC2461 4.6.3) talks nothing 2369 * about padding/truncate rule for the original IP packet. 2370 * From the discussion on IPv6imp in Feb 1999, the consensus was: 2371 * - "attach as much as possible" is the goal 2372 * - pad if not aligned (original size can be guessed by original 2373 * ip6 header) 2374 * Following code adds the padding if it is simple enough, 2375 * and truncates if not. 2376 */ 2377 if (m0->m_next || m0->m_pkthdr.len != m0->m_len) 2378 panic("assumption failed in %s:%d\n", __FILE__, __LINE__); 2379 2380 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) { 2381 /* not enough room, truncate */ 2382 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh); 2383 } else { 2384 /* enough room, pad or truncate */ 2385 size_t extra; 2386 2387 extra = m0->m_pkthdr.len % 8; 2388 if (extra) { 2389 /* pad if easy enough, truncate if not */ 2390 if (8 - extra <= M_TRAILINGSPACE(m0)) { 2391 /* pad */ 2392 m0->m_len += (8 - extra); 2393 m0->m_pkthdr.len += (8 - extra); 2394 } else { 2395 /* truncate */ 2396 m0->m_pkthdr.len -= extra; 2397 m0->m_len -= extra; 2398 } 2399 } 2400 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh); 2401 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh); 2402 } 2403 2404 nd_opt_rh = (struct nd_opt_rd_hdr *)p; 2405 bzero(nd_opt_rh, sizeof(*nd_opt_rh)); 2406 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER; 2407 nd_opt_rh->nd_opt_rh_len = len >> 3; 2408 p += sizeof(*nd_opt_rh); 2409 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2410 2411 /* connect m0 to m */ 2412 m->m_next = m0; 2413 m->m_pkthdr.len = m->m_len + m0->m_len; 2414 } 2415 noredhdropt:; 2416 2417 if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_src)) 2418 sip6->ip6_src.s6_addr16[1] = 0; 2419 if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_dst)) 2420 sip6->ip6_dst.s6_addr16[1] = 0; 2421 #if 0 2422 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src)) 2423 ip6->ip6_src.s6_addr16[1] = 0; 2424 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) 2425 ip6->ip6_dst.s6_addr16[1] = 0; 2426 #endif 2427 if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_target)) 2428 nd_rd->nd_rd_target.s6_addr16[1] = 0; 2429 if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_dst)) 2430 nd_rd->nd_rd_dst.s6_addr16[1] = 0; 2431 2432 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 2433 2434 nd_rd->nd_rd_cksum = 0; 2435 nd_rd->nd_rd_cksum 2436 = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen)); 2437 2438 /* send the packet to outside... */ 2439 #ifdef IPSEC 2440 /* Don't lookup socket */ 2441 ipsec_setsocket(m, NULL); 2442 #endif /*IPSEC*/ 2443 ip6_output(m, NULL, NULL, 0, NULL, &outif); 2444 if (outif) { 2445 icmp6_ifstat_inc(outif, ifs6_out_msg); 2446 icmp6_ifstat_inc(outif, ifs6_out_redirect); 2447 } 2448 icmp6stat.icp6s_outhist[ND_REDIRECT]++; 2449 2450 return; 2451 2452 fail: 2453 if (m) 2454 m_freem(m); 2455 if (m0) 2456 m_freem(m0); 2457 } 2458 2459 /* 2460 * ICMPv6 socket option processing. 2461 */ 2462 int 2463 icmp6_ctloutput(op, so, level, optname, mp) 2464 int op; 2465 struct socket *so; 2466 int level, optname; 2467 struct mbuf **mp; 2468 { 2469 register struct in6pcb *in6p = sotoin6pcb(so); 2470 register struct mbuf *m = *mp; 2471 int error = 0; 2472 2473 if (level != IPPROTO_ICMPV6) { 2474 error = EINVAL; 2475 if (op == PRCO_SETOPT && m) 2476 (void)m_free(m); 2477 } else switch(op) { 2478 case PRCO_SETOPT: 2479 switch (optname) { 2480 case ICMP6_FILTER: 2481 { 2482 struct icmp6_filter *p; 2483 2484 p = mtod(m, struct icmp6_filter *); 2485 if (!p || !in6p->in6p_icmp6filt) { 2486 error = EINVAL; 2487 break; 2488 } 2489 bcopy(p, in6p->in6p_icmp6filt, 2490 sizeof(struct icmp6_filter)); 2491 error = 0; 2492 break; 2493 } 2494 2495 default: 2496 error = ENOPROTOOPT; 2497 break; 2498 } 2499 if (m) 2500 (void)m_free(m); 2501 break; 2502 2503 case PRCO_GETOPT: 2504 switch (optname) { 2505 case ICMP6_FILTER: 2506 { 2507 struct icmp6_filter *p; 2508 2509 if (!in6p->in6p_icmp6filt) { 2510 error = EINVAL; 2511 break; 2512 } 2513 *mp = m = m_get(M_WAIT, MT_SOOPTS); 2514 m->m_len = sizeof(struct icmp6_filter); 2515 p = mtod(m, struct icmp6_filter *); 2516 bcopy(in6p->in6p_icmp6filt, p, 2517 sizeof(struct icmp6_filter)); 2518 error = 0; 2519 break; 2520 } 2521 2522 default: 2523 error = ENOPROTOOPT; 2524 break; 2525 } 2526 break; 2527 } 2528 2529 return(error); 2530 } 2531 2532 /* 2533 * Perform rate limit check. 2534 * Returns 0 if it is okay to send the icmp6 packet. 2535 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate 2536 * limitation. 2537 * 2538 * There are two limitations defined: 2539 * - pps limit: ICMPv6 error packet cannot exceed defined packet-per-second. 2540 * we measure it every 0.2 second, since fasttimo works every 0.2 second. 2541 * - rate limit: ICMPv6 error packet cannot appear more than once per 2542 * defined interval. 2543 * In any case, if we perform rate limitation, we'll see jitter in the ICMPv6 2544 * error packets. 2545 * 2546 * XXX per-destination/type check necessary? 2547 */ 2548 static int 2549 icmp6_ratelimit(dst, type, code) 2550 const struct in6_addr *dst; /* not used at this moment */ 2551 const int type; /* not used at this moment */ 2552 const int code; /* not used at this moment */ 2553 { 2554 int ret; 2555 2556 ret = 0; /*okay to send*/ 2557 2558 /* PPS limit */ 2559 if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count, 2560 icmp6errppslim)) { 2561 /* The packet is subject to rate limit */ 2562 ret++; 2563 } 2564 2565 if (!ratecheck(&icmp6errratelim_last, &icmp6errratelim)) { 2566 /* The packet is subject to rate limit */ 2567 ret++; 2568 } 2569 2570 return ret; 2571 } 2572 2573 static struct rtentry * 2574 icmp6_mtudisc_clone(dst) 2575 struct sockaddr *dst; 2576 { 2577 struct rtentry *rt; 2578 int error; 2579 2580 rt = rtalloc1(dst, 1); 2581 if (rt == 0) 2582 return NULL; 2583 2584 /* If we didn't get a host route, allocate one */ 2585 if ((rt->rt_flags & RTF_HOST) == 0) { 2586 struct rtentry *nrt; 2587 2588 error = rtrequest((int) RTM_ADD, dst, 2589 (struct sockaddr *) rt->rt_gateway, 2590 (struct sockaddr *) 0, 2591 RTF_GATEWAY | RTF_HOST | RTF_DYNAMIC, &nrt); 2592 if (error) { 2593 rtfree(rt); 2594 rtfree(nrt); 2595 return NULL; 2596 } 2597 nrt->rt_rmx = rt->rt_rmx; 2598 rtfree(rt); 2599 rt = nrt; 2600 } 2601 error = rt_timer_add(rt, icmp6_mtudisc_timeout, 2602 icmp6_mtudisc_timeout_q); 2603 if (error) { 2604 rtfree(rt); 2605 return NULL; 2606 } 2607 2608 return rt; /* caller need to call rtfree() */ 2609 } 2610 2611 static void 2612 icmp6_mtudisc_timeout(rt, r) 2613 struct rtentry *rt; 2614 struct rttimer *r; 2615 { 2616 if (rt == NULL) 2617 panic("icmp6_mtudisc_timeout: bad route to timeout"); 2618 if ((rt->rt_flags & (RTF_DYNAMIC | RTF_HOST)) == 2619 (RTF_DYNAMIC | RTF_HOST)) { 2620 rtrequest((int) RTM_DELETE, (struct sockaddr *)rt_key(rt), 2621 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0); 2622 } else { 2623 if ((rt->rt_rmx.rmx_locks & RTV_MTU) == 0) { 2624 rt->rt_rmx.rmx_mtu = 0; 2625 } 2626 } 2627 } 2628 2629 #include <uvm/uvm_extern.h> 2630 #include <sys/sysctl.h> 2631 2632 int 2633 icmp6_sysctl(name, namelen, oldp, oldlenp, newp, newlen) 2634 int *name; 2635 u_int namelen; 2636 void *oldp; 2637 size_t *oldlenp; 2638 void *newp; 2639 size_t newlen; 2640 { 2641 2642 /* All sysctl names at this level are terminal. */ 2643 if (namelen != 1) 2644 return ENOTDIR; 2645 2646 switch (name[0]) { 2647 2648 case ICMPV6CTL_REDIRACCEPT: 2649 return sysctl_int(oldp, oldlenp, newp, newlen, 2650 &icmp6_rediraccept); 2651 case ICMPV6CTL_REDIRTIMEOUT: 2652 return sysctl_int(oldp, oldlenp, newp, newlen, 2653 &icmp6_redirtimeout); 2654 case ICMPV6CTL_STATS: 2655 return sysctl_rdstruct(oldp, oldlenp, newp, 2656 &icmp6stat, sizeof(icmp6stat)); 2657 case ICMPV6CTL_ERRRATELIMIT: 2658 { 2659 int rate_usec, error, s; 2660 2661 /* 2662 * The sysctl specifies the rate in usec-between-icmp, 2663 * so we must convert from/to a timeval. 2664 */ 2665 rate_usec = (icmp6errratelim.tv_sec * 1000000) + 2666 icmp6errratelim.tv_usec; 2667 error = sysctl_int(oldp, oldlenp, newp, newlen, &rate_usec); 2668 if (error) 2669 return (error); 2670 if (rate_usec < 0) 2671 return (EINVAL); 2672 s = splsoftnet(); 2673 icmp6errratelim.tv_sec = rate_usec / 1000000; 2674 icmp6errratelim.tv_usec = rate_usec % 1000000; 2675 splx(s); 2676 2677 return (0); 2678 } 2679 case ICMPV6CTL_ND6_PRUNE: 2680 return sysctl_int(oldp, oldlenp, newp, newlen, &nd6_prune); 2681 case ICMPV6CTL_ND6_DELAY: 2682 return sysctl_int(oldp, oldlenp, newp, newlen, &nd6_delay); 2683 case ICMPV6CTL_ND6_UMAXTRIES: 2684 return sysctl_int(oldp, oldlenp, newp, newlen, &nd6_umaxtries); 2685 case ICMPV6CTL_ND6_MMAXTRIES: 2686 return sysctl_int(oldp, oldlenp, newp, newlen, &nd6_mmaxtries); 2687 case ICMPV6CTL_ND6_USELOOPBACK: 2688 return sysctl_int(oldp, oldlenp, newp, newlen, 2689 &nd6_useloopback); 2690 case ICMPV6CTL_NODEINFO: 2691 return sysctl_int(oldp, oldlenp, newp, newlen, &icmp6_nodeinfo); 2692 case ICMPV6CTL_ERRPPSLIMIT: 2693 return sysctl_int(oldp, oldlenp, newp, newlen, &icmp6errppslim); 2694 case ICMPV6CTL_ND6_MAXNUDHINT: 2695 return sysctl_int(oldp, oldlenp, newp, newlen, 2696 &nd6_maxnudhint); 2697 default: 2698 return ENOPROTOOPT; 2699 } 2700 /* NOTREACHED */ 2701 } 2702
Indexes created Tue Sep 23 07:09:52 GMT 2025