icmp6.c revision 1.33.2.15
1 /* $NetBSD: icmp6.c,v 1.33.2.15 2001/06/07 16:13:05 he Exp $ */ 2 /* $KAME: icmp6.c,v 1.146 2000/10/01 12:37:20 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 #include <netkey/key_debug.h> 100 101 #ifdef IPSEC 102 #include <netinet6/ipsec.h> 103 #include <netkey/key.h> 104 #endif 105 106 #include "faith.h" 107 #if defined(NFAITH) && 0 < NFAITH 108 #include <net/if_faith.h> 109 #endif 110 111 #include <net/net_osdep.h> 112 113 extern struct domain inet6domain; 114 115 struct icmp6stat icmp6stat; 116 117 extern struct in6pcb rawin6pcb; 118 extern int icmp6errppslim; 119 static int icmp6errpps_count = 0; 120 static struct timeval icmp6errppslim_last; 121 extern int icmp6_nodeinfo; 122 static struct rttimer_queue *icmp6_mtudisc_timeout_q = NULL; 123 extern int pmtu_expire; 124 125 static int icmp6_rip6_input __P((struct mbuf **, int)); 126 static void icmp6_mtudisc_update __P((struct in6_addr *, struct icmp6_hdr *, 127 struct mbuf *)); 128 static int icmp6_ratelimit __P((const struct in6_addr *, const int, const int)); 129 static const char *icmp6_redirect_diag __P((struct in6_addr *, 130 struct in6_addr *, struct in6_addr *)); 131 static struct mbuf *ni6_input __P((struct mbuf *, int)); 132 static struct mbuf *ni6_nametodns __P((const char *, int, int)); 133 static int ni6_dnsmatch __P((const char *, int, const char *, int)); 134 static int ni6_addrs __P((struct icmp6_nodeinfo *, struct mbuf *, 135 struct ifnet **)); 136 static int ni6_store_addrs __P((struct icmp6_nodeinfo *, struct icmp6_nodeinfo *, 137 struct ifnet *, int)); 138 static struct rtentry *icmp6_mtudisc_clone __P((struct sockaddr *)); 139 static void icmp6_mtudisc_timeout __P((struct rtentry *, struct rttimer *)); 140 141 #ifdef COMPAT_RFC1885 142 static struct route_in6 icmp6_reflect_rt; 143 #endif 144 145 void 146 icmp6_init() 147 { 148 mld6_init(); 149 icmp6_mtudisc_timeout_q = rt_timer_queue_create(pmtu_expire); 150 } 151 152 /* 153 * Generate an error packet of type error in response to bad IP6 packet. 154 */ 155 void 156 icmp6_error(m, type, code, param) 157 struct mbuf *m; 158 int type, code, param; 159 { 160 struct ip6_hdr *oip6, *nip6; 161 struct icmp6_hdr *icmp6; 162 u_int preplen; 163 int off; 164 int nxt; 165 166 icmp6stat.icp6s_error++; 167 168 if (m->m_flags & M_DECRYPTED) { 169 icmp6stat.icp6s_canterror++; 170 goto freeit; 171 } 172 173 #ifndef PULLDOWN_TEST 174 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), ); 175 #else 176 if (m->m_len < sizeof(struct ip6_hdr)) { 177 m = m_pullup(m, sizeof(struct ip6_hdr)); 178 if (m == NULL) 179 return; 180 } 181 #endif 182 oip6 = mtod(m, struct ip6_hdr *); 183 184 /* 185 * Multicast destination check. For unrecognized option errors, 186 * this check has already done in ip6_unknown_opt(), so we can 187 * check only for other errors. 188 */ 189 if ((m->m_flags & (M_BCAST|M_MCAST) || 190 IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) && 191 (type != ICMP6_PACKET_TOO_BIG && 192 (type != ICMP6_PARAM_PROB || 193 code != ICMP6_PARAMPROB_OPTION))) 194 goto freeit; 195 196 /* Source address check. XXX: the case of anycast source? */ 197 if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) || 198 IN6_IS_ADDR_MULTICAST(&oip6->ip6_src)) 199 goto freeit; 200 201 /* 202 * If we are about to send ICMPv6 against ICMPv6 error/redirect, 203 * don't do it. 204 */ 205 nxt = -1; 206 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 207 if (off >= 0 && nxt == IPPROTO_ICMPV6) { 208 struct icmp6_hdr *icp; 209 210 #ifndef PULLDOWN_TEST 211 IP6_EXTHDR_CHECK(m, 0, off + sizeof(struct icmp6_hdr), ); 212 icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 213 #else 214 IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off, 215 sizeof(*icp)); 216 if (icp == NULL) { 217 icmp6stat.icp6s_tooshort++; 218 return; 219 } 220 #endif 221 if (icp->icmp6_type < ICMP6_ECHO_REQUEST || 222 icp->icmp6_type == ND_REDIRECT) { 223 /* 224 * ICMPv6 error 225 * Special case: for redirect (which is 226 * informational) we must not send icmp6 error. 227 */ 228 icmp6stat.icp6s_canterror++; 229 goto freeit; 230 } else { 231 /* ICMPv6 informational - send the error */ 232 } 233 } else { 234 /* non-ICMPv6 - send the error */ 235 } 236 237 oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */ 238 239 /* Finally, do rate limitation check. */ 240 if (icmp6_ratelimit(&oip6->ip6_src, type, code)) { 241 icmp6stat.icp6s_toofreq++; 242 goto freeit; 243 } 244 245 /* 246 * OK, ICMP6 can be generated. 247 */ 248 249 if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN) 250 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len); 251 252 preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 253 M_PREPEND(m, preplen, M_DONTWAIT); 254 if (m && m->m_len < preplen) 255 m = m_pullup(m, preplen); 256 if (m == NULL) { 257 printf("ENOBUFS in icmp6_error %d\n", __LINE__); 258 return; 259 } 260 261 nip6 = mtod(m, struct ip6_hdr *); 262 nip6->ip6_src = oip6->ip6_src; 263 nip6->ip6_dst = oip6->ip6_dst; 264 265 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_src)) 266 oip6->ip6_src.s6_addr16[1] = 0; 267 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_dst)) 268 oip6->ip6_dst.s6_addr16[1] = 0; 269 270 icmp6 = (struct icmp6_hdr *)(nip6 + 1); 271 icmp6->icmp6_type = type; 272 icmp6->icmp6_code = code; 273 icmp6->icmp6_pptr = htonl((u_int32_t)param); 274 275 /* 276 * icmp6_reflect() is designed to be in the input path. 277 * icmp6_error() can be called from both input and outut path, 278 * and if we are in output path rcvif could contain bogus value. 279 * clear m->m_pkthdr.rcvif for safety, we should have enough scope 280 * information in ip header (nip6). 281 */ 282 m->m_pkthdr.rcvif = NULL; 283 284 icmp6stat.icp6s_outhist[type]++; 285 icmp6_reflect(m, sizeof(struct ip6_hdr)); /*header order: IPv6 - ICMPv6*/ 286 287 return; 288 289 freeit: 290 /* 291 * If we can't tell wheter or not we can generate ICMP6, free it. 292 */ 293 m_freem(m); 294 } 295 296 /* 297 * Process a received ICMP6 message. 298 */ 299 int 300 icmp6_input(mp, offp, proto) 301 struct mbuf **mp; 302 int *offp, proto; 303 { 304 struct mbuf *m = *mp, *n; 305 struct ip6_hdr *ip6, *nip6; 306 struct icmp6_hdr *icmp6, *nicmp6; 307 int off = *offp; 308 int icmp6len = m->m_pkthdr.len - *offp; 309 int code, sum, noff; 310 struct sockaddr_in6 icmp6src; 311 312 #ifndef PULLDOWN_TEST 313 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr), IPPROTO_DONE); 314 /* m might change if M_LOOP. So, call mtod after this */ 315 #endif 316 317 /* 318 * Locate icmp6 structure in mbuf, and check 319 * that not corrupted and of at least minimum length 320 */ 321 322 ip6 = mtod(m, struct ip6_hdr *); 323 if (icmp6len < sizeof(struct icmp6_hdr)) { 324 icmp6stat.icp6s_tooshort++; 325 goto freeit; 326 } 327 328 /* 329 * calculate the checksum 330 */ 331 #ifndef PULLDOWN_TEST 332 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off); 333 #else 334 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 335 if (icmp6 == NULL) { 336 icmp6stat.icp6s_tooshort++; 337 return IPPROTO_DONE; 338 } 339 #endif 340 code = icmp6->icmp6_code; 341 342 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) { 343 #ifdef ND6_DEBUG 344 log(LOG_ERR, 345 "ICMP6 checksum error(%d|%x) %s\n", 346 icmp6->icmp6_type, sum, ip6_sprintf(&ip6->ip6_src)); 347 #endif 348 icmp6stat.icp6s_checksum++; 349 goto freeit; 350 } 351 352 #if defined(NFAITH) && 0 < NFAITH 353 if (faithprefix(&ip6->ip6_dst)) { 354 /* 355 * Deliver very specific ICMP6 type only. 356 * This is important to deilver TOOBIG. Otherwise PMTUD 357 * will not work. 358 */ 359 switch (icmp6->icmp6_type) { 360 case ICMP6_DST_UNREACH: 361 case ICMP6_PACKET_TOO_BIG: 362 case ICMP6_TIME_EXCEEDED: 363 break; 364 default: 365 goto freeit; 366 } 367 } 368 #endif 369 370 icmp6stat.icp6s_inhist[icmp6->icmp6_type]++; 371 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_msg); 372 if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK) 373 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error); 374 375 switch (icmp6->icmp6_type) { 376 377 case ICMP6_DST_UNREACH: 378 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_dstunreach); 379 switch (code) { 380 case ICMP6_DST_UNREACH_NOROUTE: 381 code = PRC_UNREACH_NET; 382 break; 383 case ICMP6_DST_UNREACH_ADMIN: 384 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_adminprohib); 385 code = PRC_UNREACH_PROTOCOL; /* is this a good code? */ 386 break; 387 case ICMP6_DST_UNREACH_ADDR: 388 code = PRC_HOSTDEAD; 389 break; 390 #ifdef COMPAT_RFC1885 391 case ICMP6_DST_UNREACH_NOTNEIGHBOR: 392 code = PRC_UNREACH_SRCFAIL; 393 break; 394 #else 395 case ICMP6_DST_UNREACH_BEYONDSCOPE: 396 /* I mean "source address was incorrect." */ 397 code = PRC_PARAMPROB; 398 break; 399 #endif 400 case ICMP6_DST_UNREACH_NOPORT: 401 code = PRC_UNREACH_PORT; 402 break; 403 default: 404 goto badcode; 405 } 406 goto deliver; 407 break; 408 409 case ICMP6_PACKET_TOO_BIG: 410 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_pkttoobig); 411 if (code != 0) 412 goto badcode; 413 414 code = PRC_MSGSIZE; 415 416 /* 417 * Updating the path MTU will be done after examining 418 * intermediate extension headers. 419 */ 420 goto deliver; 421 break; 422 423 case ICMP6_TIME_EXCEEDED: 424 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_timeexceed); 425 switch (code) { 426 case ICMP6_TIME_EXCEED_TRANSIT: 427 case ICMP6_TIME_EXCEED_REASSEMBLY: 428 code += PRC_TIMXCEED_INTRANS; 429 break; 430 default: 431 goto badcode; 432 } 433 goto deliver; 434 break; 435 436 case ICMP6_PARAM_PROB: 437 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_paramprob); 438 switch (code) { 439 case ICMP6_PARAMPROB_NEXTHEADER: 440 code = PRC_UNREACH_PROTOCOL; 441 break; 442 case ICMP6_PARAMPROB_HEADER: 443 case ICMP6_PARAMPROB_OPTION: 444 code = PRC_PARAMPROB; 445 break; 446 default: 447 goto badcode; 448 } 449 goto deliver; 450 break; 451 452 case ICMP6_ECHO_REQUEST: 453 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echo); 454 if (code != 0) 455 goto badcode; 456 if ((n = m_copy(m, 0, M_COPYALL)) == NULL) { 457 /* Give up remote */ 458 break; 459 } 460 if ((n->m_flags & M_EXT) != 0 461 || n->m_len < off + sizeof(struct icmp6_hdr)) { 462 struct mbuf *n0 = n; 463 const int maxlen = sizeof(*nip6) + sizeof(*nicmp6); 464 465 /* 466 * Prepare an internal mbuf. m_pullup() doesn't 467 * always copy the length we specified. 468 */ 469 if (maxlen >= MCLBYTES) { 470 #ifdef DIAGNOSTIC 471 printf("MCLBYTES too small\n"); 472 #endif 473 /* Give up remote */ 474 m_freem(n0); 475 break; 476 } 477 MGETHDR(n, M_DONTWAIT, n0->m_type); 478 if (n && maxlen >= MHLEN) { 479 MCLGET(n, M_DONTWAIT); 480 if ((n->m_flags & M_EXT) == 0) { 481 m_free(n); 482 n = NULL; 483 } 484 } 485 if (n == NULL) { 486 /* Give up remote */ 487 m_freem(n0); 488 break; 489 } 490 M_COPY_PKTHDR(n, n0); 491 /* 492 * Copy IPv6 and ICMPv6 only. 493 */ 494 nip6 = mtod(n, struct ip6_hdr *); 495 bcopy(ip6, nip6, sizeof(struct ip6_hdr)); 496 nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 497 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); 498 noff = sizeof(struct ip6_hdr); 499 n->m_pkthdr.len = n->m_len = 500 noff + sizeof(struct icmp6_hdr); 501 /* 502 * Adjust mbuf. ip6_plen will be adjusted in 503 * ip6_output(). 504 */ 505 m_adj(n0, off + sizeof(struct icmp6_hdr)); 506 n->m_pkthdr.len += n0->m_pkthdr.len; 507 n->m_next = n0; 508 n0->m_flags &= ~M_PKTHDR; 509 } else { 510 nip6 = mtod(n, struct ip6_hdr *); 511 nicmp6 = (struct icmp6_hdr *)((caddr_t)nip6 + off); 512 noff = off; 513 } 514 nicmp6->icmp6_type = ICMP6_ECHO_REPLY; 515 nicmp6->icmp6_code = 0; 516 if (n) { 517 icmp6stat.icp6s_reflect++; 518 icmp6stat.icp6s_outhist[ICMP6_ECHO_REPLY]++; 519 icmp6_reflect(n, noff); 520 } 521 break; 522 523 case ICMP6_ECHO_REPLY: 524 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echoreply); 525 if (code != 0) 526 goto badcode; 527 break; 528 529 case MLD6_LISTENER_QUERY: 530 case MLD6_LISTENER_REPORT: 531 if (icmp6len < sizeof(struct mld6_hdr)) 532 goto badlen; 533 if (icmp6->icmp6_type == MLD6_LISTENER_QUERY) /* XXX: ugly... */ 534 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldquery); 535 else 536 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldreport); 537 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 538 /* give up local */ 539 mld6_input(m, off); 540 m = NULL; 541 goto freeit; 542 } 543 mld6_input(n, off); 544 /* m stays. */ 545 break; 546 547 case MLD6_LISTENER_DONE: 548 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mlddone); 549 if (icmp6len < sizeof(struct mld6_hdr)) /* necessary? */ 550 goto badlen; 551 break; /* nothing to be done in kernel */ 552 553 case MLD6_MTRACE_RESP: 554 case MLD6_MTRACE: 555 /* XXX: these two are experimental. not officially defind. */ 556 /* XXX: per-interface statistics? */ 557 break; /* just pass it to applications */ 558 559 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */ 560 { 561 enum { WRU, FQDN } mode; 562 563 if (!icmp6_nodeinfo) 564 break; 565 566 if (icmp6len == sizeof(struct icmp6_hdr) + 4) 567 mode = WRU; 568 else if (icmp6len >= sizeof(struct icmp6_nodeinfo)) 569 mode = FQDN; 570 else 571 goto badlen; 572 573 if (mode == FQDN) { 574 #ifndef PULLDOWN_TEST 575 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo), 576 IPPROTO_DONE); 577 #endif 578 n = m_copy(m, 0, M_COPYALL); 579 if (n) 580 n = ni6_input(n, off); 581 /* XXX meaningless if n == NULL */ 582 noff = sizeof(struct ip6_hdr); 583 } else { 584 u_char *p; 585 int maxlen, maxhlen; 586 587 if (code != 0) 588 goto badcode; 589 maxlen = sizeof(*nip6) + sizeof(*nicmp6) + 4; 590 if (maxlen >= MCLBYTES) { 591 #ifdef DIAGNOSTIC 592 printf("MCLBYTES too small\n"); 593 #endif 594 /* Give up remote */ 595 break; 596 } 597 MGETHDR(n, M_DONTWAIT, m->m_type); 598 if (n && maxlen > MHLEN) { 599 MCLGET(n, M_DONTWAIT); 600 if ((n->m_flags & M_EXT) == 0) { 601 m_free(n); 602 n = NULL; 603 } 604 } 605 if (n == NULL) { 606 /* Give up remote */ 607 break; 608 } 609 n->m_len = 0; 610 maxhlen = M_TRAILINGSPACE(n) - maxlen; 611 if (maxhlen > hostnamelen) 612 maxhlen = hostnamelen; 613 /* 614 * Copy IPv6 and ICMPv6 only. 615 */ 616 nip6 = mtod(n, struct ip6_hdr *); 617 bcopy(ip6, nip6, sizeof(struct ip6_hdr)); 618 nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 619 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); 620 p = (u_char *)(nicmp6 + 1); 621 bzero(p, 4); 622 bcopy(hostname, p + 4, maxhlen); /*meaningless TTL*/ 623 noff = sizeof(struct ip6_hdr); 624 M_COPY_PKTHDR(n, m); /* just for recvif */ 625 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 626 sizeof(struct icmp6_hdr) + 4 + maxhlen; 627 nicmp6->icmp6_type = ICMP6_WRUREPLY; 628 nicmp6->icmp6_code = 0; 629 } 630 #undef hostnamelen 631 if (n) { 632 icmp6stat.icp6s_reflect++; 633 icmp6stat.icp6s_outhist[ICMP6_WRUREPLY]++; 634 icmp6_reflect(n, noff); 635 } 636 break; 637 } 638 639 case ICMP6_WRUREPLY: 640 if (code != 0) 641 goto badcode; 642 break; 643 644 case ND_ROUTER_SOLICIT: 645 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routersolicit); 646 if (code != 0) 647 goto badcode; 648 if (icmp6len < sizeof(struct nd_router_solicit)) 649 goto badlen; 650 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 651 /* give up local */ 652 nd6_rs_input(m, off, icmp6len); 653 m = NULL; 654 goto freeit; 655 } 656 nd6_rs_input(n, off, icmp6len); 657 /* m stays. */ 658 break; 659 660 case ND_ROUTER_ADVERT: 661 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routeradvert); 662 if (code != 0) 663 goto badcode; 664 if (icmp6len < sizeof(struct nd_router_advert)) 665 goto badlen; 666 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 667 /* give up local */ 668 nd6_ra_input(m, off, icmp6len); 669 m = NULL; 670 goto freeit; 671 } 672 nd6_ra_input(n, off, icmp6len); 673 /* m stays. */ 674 break; 675 676 case ND_NEIGHBOR_SOLICIT: 677 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighborsolicit); 678 if (code != 0) 679 goto badcode; 680 if (icmp6len < sizeof(struct nd_neighbor_solicit)) 681 goto badlen; 682 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 683 /* give up local */ 684 nd6_ns_input(m, off, icmp6len); 685 m = NULL; 686 goto freeit; 687 } 688 nd6_ns_input(n, off, icmp6len); 689 /* m stays. */ 690 break; 691 692 case ND_NEIGHBOR_ADVERT: 693 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighboradvert); 694 if (code != 0) 695 goto badcode; 696 if (icmp6len < sizeof(struct nd_neighbor_advert)) 697 goto badlen; 698 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 699 /* give up local */ 700 nd6_na_input(m, off, icmp6len); 701 m = NULL; 702 goto freeit; 703 } 704 nd6_na_input(n, off, icmp6len); 705 /* m stays. */ 706 break; 707 708 case ND_REDIRECT: 709 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_redirect); 710 if (code != 0) 711 goto badcode; 712 if (icmp6len < sizeof(struct nd_redirect)) 713 goto badlen; 714 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 715 /* give up local */ 716 icmp6_redirect_input(m, off); 717 m = NULL; 718 goto freeit; 719 } 720 icmp6_redirect_input(n, off); 721 /* m stays. */ 722 break; 723 724 case ICMP6_ROUTER_RENUMBERING: 725 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND && 726 code != ICMP6_ROUTER_RENUMBERING_RESULT) 727 goto badcode; 728 if (icmp6len < sizeof(struct icmp6_router_renum)) 729 goto badlen; 730 break; 731 732 default: 733 printf("icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n", 734 icmp6->icmp6_type, ip6_sprintf(&ip6->ip6_src), 735 ip6_sprintf(&ip6->ip6_dst), 736 m->m_pkthdr.rcvif ? m->m_pkthdr.rcvif->if_index : 0); 737 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) { 738 /* ICMPv6 error: MUST deliver it by spec... */ 739 code = PRC_NCMDS; 740 /* deliver */ 741 } else { 742 /* ICMPv6 informational: MUST not deliver */ 743 break; 744 } 745 deliver: 746 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) { 747 icmp6stat.icp6s_tooshort++; 748 goto freeit; 749 } 750 #ifndef PULLDOWN_TEST 751 IP6_EXTHDR_CHECK(m, off, 752 sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr), 753 IPPROTO_DONE); 754 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 755 #else 756 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 757 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 758 if (icmp6 == NULL) { 759 icmp6stat.icp6s_tooshort++; 760 return IPPROTO_DONE; 761 } 762 #endif 763 bzero(&icmp6src, sizeof(icmp6src)); 764 icmp6src.sin6_len = sizeof(struct sockaddr_in6); 765 icmp6src.sin6_family = AF_INET6; 766 icmp6src.sin6_addr = ((struct ip6_hdr *)(icmp6 + 1))->ip6_dst; 767 768 /* Detect the upper level protocol */ 769 { 770 void (*ctlfunc) __P((int, struct sockaddr *, void *)); 771 struct ip6_hdr *eip6 = (struct ip6_hdr *)(icmp6 + 1); 772 u_int8_t nxt = eip6->ip6_nxt; 773 int eoff = off + sizeof(struct icmp6_hdr) + 774 sizeof(struct ip6_hdr); 775 struct ip6ctlparam ip6cp; 776 struct in6_addr *finaldst = NULL; 777 int icmp6type = icmp6->icmp6_type; 778 struct ip6_frag *fh; 779 struct ip6_rthdr *rth; 780 struct ip6_rthdr0 *rth0; 781 int rthlen; 782 783 while (1) { /* XXX: should avoid inf. loop explicitly? */ 784 struct ip6_ext *eh; 785 786 switch(nxt) { 787 case IPPROTO_HOPOPTS: 788 case IPPROTO_DSTOPTS: 789 case IPPROTO_AH: 790 #ifndef PULLDOWN_TEST 791 IP6_EXTHDR_CHECK(m, 0, eoff + 792 sizeof(struct ip6_ext), 793 IPPROTO_DONE); 794 eh = (struct ip6_ext *)(mtod(m, caddr_t) 795 + eoff); 796 #else 797 IP6_EXTHDR_GET(eh, struct ip6_ext *, m, 798 eoff, sizeof(*eh)); 799 if (eh == NULL) { 800 icmp6stat.icp6s_tooshort++; 801 return IPPROTO_DONE; 802 } 803 #endif 804 805 if (nxt == IPPROTO_AH) 806 eoff += (eh->ip6e_len + 2) << 2; 807 else 808 eoff += (eh->ip6e_len + 1) << 3; 809 nxt = eh->ip6e_nxt; 810 break; 811 case IPPROTO_ROUTING: 812 /* 813 * When the erroneous packet contains a 814 * routing header, we should examine the 815 * header to determine the final destination. 816 * Otherwise, we can't properly update 817 * information that depends on the final 818 * destination (e.g. path MTU). 819 */ 820 #ifndef PULLDOWN_TEST 821 IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(*rth), 822 IPPROTO_DONE); 823 rth = (struct ip6_rthdr *)(mtod(m, caddr_t) 824 + eoff); 825 #else 826 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m, 827 eoff, sizeof(*rth)); 828 if (rth == NULL) { 829 icmp6stat.icp6s_tooshort++; 830 return IPPROTO_DONE; 831 } 832 #endif 833 rthlen = (rth->ip6r_len + 1) << 3; 834 /* 835 * XXX: currently there is no 836 * officially defined type other 837 * than type-0. 838 * Note that if the segment left field 839 * is 0, all intermediate hops must 840 * have been passed. 841 */ 842 if (rth->ip6r_segleft && 843 rth->ip6r_type == IPV6_RTHDR_TYPE_0) { 844 int hops; 845 846 #ifndef PULLDOWN_TEST 847 IP6_EXTHDR_CHECK(m, 0, eoff + rthlen, 848 IPPROTO_DONE); 849 rth0 = (struct ip6_rthdr0 *)(mtod(m, caddr_t) + eoff); 850 #else 851 IP6_EXTHDR_GET(rth0, 852 struct ip6_rthdr0 *, m, 853 eoff, rthlen); 854 if (rth0 == NULL) { 855 icmp6stat.icp6s_tooshort++; 856 return IPPROTO_DONE; 857 } 858 #endif 859 /* just ignore a bogus header */ 860 if ((rth0->ip6r0_len % 2) == 0 && 861 (hops = rth0->ip6r0_len/2)) 862 finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1); 863 } 864 eoff += rthlen; 865 nxt = rth->ip6r_nxt; 866 break; 867 case IPPROTO_FRAGMENT: 868 #ifndef PULLDOWN_TEST 869 IP6_EXTHDR_CHECK(m, 0, eoff + 870 sizeof(struct ip6_frag), 871 IPPROTO_DONE); 872 fh = (struct ip6_frag *)(mtod(m, caddr_t) 873 + eoff); 874 #else 875 IP6_EXTHDR_GET(fh, struct ip6_frag *, m, 876 eoff, sizeof(*fh)); 877 if (fh == NULL) { 878 icmp6stat.icp6s_tooshort++; 879 return IPPROTO_DONE; 880 } 881 #endif 882 /* 883 * Data after a fragment header is meaningless 884 * unless it is the first fragment, but 885 * we'll go to the notify label for path MTU 886 * discovery. 887 */ 888 if (fh->ip6f_offlg & IP6F_OFF_MASK) 889 goto notify; 890 891 eoff += sizeof(struct ip6_frag); 892 nxt = fh->ip6f_nxt; 893 break; 894 default: 895 /* 896 * This case includes ESP and the No Next 897 * Header. In such cases going to the notify 898 * label does not have any meaning 899 * (i.e. ctlfunc will be NULL), but we go 900 * anyway since we might have to update 901 * path MTU information. 902 */ 903 goto notify; 904 } 905 } 906 notify: 907 #ifndef PULLDOWN_TEST 908 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 909 #else 910 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 911 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 912 if (icmp6 == NULL) { 913 icmp6stat.icp6s_tooshort++; 914 return IPPROTO_DONE; 915 } 916 #endif 917 if (icmp6type == ICMP6_PACKET_TOO_BIG) { 918 if (finaldst == NULL) 919 finaldst = &((struct ip6_hdr *)(icmp6 + 1))->ip6_dst; 920 icmp6_mtudisc_update(finaldst, icmp6, m); 921 } 922 923 ctlfunc = (void (*) __P((int, struct sockaddr *, void *))) 924 (inet6sw[ip6_protox[nxt]].pr_ctlinput); 925 if (ctlfunc) { 926 ip6cp.ip6c_m = m; 927 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1); 928 ip6cp.ip6c_off = eoff; 929 (*ctlfunc)(code, (struct sockaddr *)&icmp6src, &ip6cp); 930 } 931 } 932 break; 933 934 badcode: 935 icmp6stat.icp6s_badcode++; 936 break; 937 938 badlen: 939 icmp6stat.icp6s_badlen++; 940 break; 941 } 942 943 icmp6_rip6_input(&m, *offp); 944 return IPPROTO_DONE; 945 946 freeit: 947 m_freem(m); 948 return IPPROTO_DONE; 949 } 950 951 static void 952 icmp6_mtudisc_update(dst, icmp6, m) 953 struct in6_addr *dst; 954 struct icmp6_hdr *icmp6;/* we can assume the validity of the pointer */ 955 struct mbuf *m; /* currently unused but added for scoped addrs */ 956 { 957 u_int mtu = ntohl(icmp6->icmp6_mtu); 958 struct rtentry *rt = NULL; 959 struct sockaddr_in6 sin6; 960 961 bzero(&sin6, sizeof(sin6)); 962 sin6.sin6_family = PF_INET6; 963 sin6.sin6_len = sizeof(struct sockaddr_in6); 964 sin6.sin6_addr = *dst; 965 /* sin6.sin6_scope_id = XXX: should be set if DST is a scoped addr */ 966 rt = rtalloc1((struct sockaddr *)&sin6, 1); /*clone*/ 967 if (!rt || (rt->rt_flags & RTF_HOST) == 0) { 968 if (rt) 969 RTFREE(rt); 970 rt = icmp6_mtudisc_clone((struct sockaddr *)&sin6); 971 } 972 973 if (rt && (rt->rt_flags & RTF_HOST) 974 && !(rt->rt_rmx.rmx_locks & RTV_MTU)) { 975 if (mtu < IPV6_MMTU) { 976 /* xxx */ 977 rt->rt_rmx.rmx_locks |= RTV_MTU; 978 } else if (mtu < rt->rt_ifp->if_mtu && 979 rt->rt_rmx.rmx_mtu > mtu) { 980 rt->rt_rmx.rmx_mtu = mtu; 981 } 982 } 983 if (rt) 984 RTFREE(rt); 985 } 986 987 /* 988 * Process a Node Information Query packet, based on 989 * draft-ietf-ipngwg-icmp-name-lookups-06. 990 * 991 * Spec incompatibilities: 992 * - IPv6 Subject address handling 993 * - IPv4 Subject address handling support missing 994 * - Proxy reply (answer even if it's not for me) 995 * - joins NI group address at in6_ifattach() time only, does not cope 996 * with hostname changes by sethostname(3) 997 */ 998 #ifndef offsetof /* XXX */ 999 #define offsetof(type, member) ((size_t)(&((type *)0)->member)) 1000 #endif 1001 static struct mbuf * 1002 ni6_input(m, off) 1003 struct mbuf *m; 1004 int off; 1005 { 1006 struct icmp6_nodeinfo *ni6, *nni6; 1007 struct mbuf *n = NULL; 1008 u_int16_t qtype; 1009 int subjlen; 1010 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1011 struct ni_reply_fqdn *fqdn; 1012 int addrs; /* for NI_QTYPE_NODEADDR */ 1013 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */ 1014 struct sockaddr_in6 sin6; 1015 struct ip6_hdr *ip6; 1016 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */ 1017 char *subj; 1018 1019 ip6 = mtod(m, struct ip6_hdr *); 1020 #ifndef PULLDOWN_TEST 1021 ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off); 1022 #else 1023 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6)); 1024 if (ni6 == NULL) { 1025 /* m is already reclaimed */ 1026 return NULL; 1027 } 1028 #endif 1029 1030 /* 1031 * Validate IPv6 destination address. 1032 * 1033 * We accept packets with the following IPv6 destination address: 1034 * - Responder's unicast/anycast address, and 1035 * - link-local multicast address (including NI group address) 1036 */ 1037 bzero(&sin6, sizeof(sin6)); 1038 sin6.sin6_family = AF_INET6; 1039 sin6.sin6_len = sizeof(struct sockaddr_in6); 1040 bcopy(&ip6->ip6_dst, &sin6.sin6_addr, sizeof(sin6.sin6_addr)); 1041 /* XXX scopeid */ 1042 if (ifa_ifwithaddr((struct sockaddr *)&sin6)) 1043 ; /*unicast/anycast, fine*/ 1044 else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr)) 1045 ; /*violates spec slightly, see above*/ 1046 else 1047 goto bad; 1048 1049 /* guess reply length */ 1050 qtype = ntohs(ni6->ni_qtype); 1051 switch (qtype) { 1052 case NI_QTYPE_NOOP: 1053 break; /* no reply data */ 1054 case NI_QTYPE_SUPTYPES: 1055 replylen += sizeof(u_int32_t); 1056 break; 1057 case NI_QTYPE_FQDN: 1058 /* XXX will append a mbuf */ 1059 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1060 break; 1061 case NI_QTYPE_NODEADDR: 1062 addrs = ni6_addrs(ni6, m, &ifp); 1063 if ((replylen += addrs * sizeof(struct in6_addr)) > MCLBYTES) 1064 replylen = MCLBYTES; /* XXX: we'll truncate later */ 1065 break; 1066 default: 1067 /* 1068 * XXX: We must return a reply with the ICMP6 code 1069 * `unknown Qtype' in this case. However we regard the case 1070 * as an FQDN query for backward compatibility. 1071 * Older versions set a random value to this field, 1072 * so it rarely varies in the defined qtypes. 1073 * But the mechanism is not reliable... 1074 * maybe we should obsolete older versions. 1075 */ 1076 qtype = NI_QTYPE_FQDN; 1077 /* XXX will append a mbuf */ 1078 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1079 oldfqdn++; 1080 break; 1081 } 1082 1083 /* validate query Subject field. */ 1084 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo); 1085 switch (qtype) { 1086 case NI_QTYPE_NOOP: 1087 case NI_QTYPE_SUPTYPES: 1088 /* 06 draft */ 1089 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0) 1090 break; 1091 /*FALLTHROUGH*/ 1092 case NI_QTYPE_FQDN: 1093 case NI_QTYPE_NODEADDR: 1094 switch (ni6->ni_code) { 1095 case ICMP6_NI_SUBJ_IPV6: 1096 #if ICMP6_NI_SUBJ_IPV6 != 0 1097 case 0: 1098 #endif 1099 /* 1100 * backward compatibility - try to accept 03 draft 1101 * format, where no Subject is present. 1102 */ 1103 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 && 1104 subjlen == 0) { 1105 oldfqdn++; 1106 break; 1107 } 1108 #if ICMP6_NI_SUBJ_IPV6 != 0 1109 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6) 1110 goto bad; 1111 #endif 1112 1113 if (subjlen != sizeof(sin6.sin6_addr)) 1114 goto bad; 1115 1116 /* 1117 * Validate Subject address. 1118 * 1119 * Not sure what exactly does "address belongs to the 1120 * node" mean in the spec, is it just unicast, or what? 1121 * 1122 * At this moment we consider Subject address as 1123 * "belong to the node" if the Subject address equals 1124 * to the IPv6 destination address; validation for 1125 * IPv6 destination address should have done enough 1126 * check for us. 1127 * 1128 * We do not do proxy at this moment. 1129 */ 1130 /* m_pulldown instead of copy? */ 1131 m_copydata(m, off + sizeof(struct icmp6_nodeinfo), 1132 subjlen, (caddr_t)&sin6.sin6_addr); 1133 /* XXX kame scope hack */ 1134 if (IN6_IS_SCOPE_LINKLOCAL(&sin6.sin6_addr)) { 1135 #ifdef FAKE_LOOPBACK_IF 1136 if ((m->m_flags & M_PKTHDR) != 0 && 1137 m->m_pkthdr.rcvif) { 1138 sin6.sin6_addr.s6_addr16[1] = 1139 htons(m->m_pkthdr.rcvif->if_index); 1140 } 1141 #else 1142 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 1143 sin6.sin6_addr.s6_addr16[1] = 1144 ip6->ip6_dst.s6_addr16[1]; 1145 } 1146 #endif 1147 } 1148 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &sin6.sin6_addr)) 1149 break; 1150 /* 1151 * XXX if we are to allow other cases, we should really 1152 * be careful about scope here. 1153 * basically, we should disallow queries toward IPv6 1154 * destination X with subject Y, if scope(X) > scope(Y). 1155 * if we allow scope(X) > scope(Y), it will result in 1156 * information leakage across scope boundary. 1157 */ 1158 goto bad; 1159 1160 case ICMP6_NI_SUBJ_FQDN: 1161 /* 1162 * Validate Subject name with gethostname(3). 1163 * 1164 * The behavior may need some debate, since: 1165 * - we are not sure if the node has FQDN as 1166 * hostname (returned by gethostname(3)). 1167 * - the code does wildcard match for truncated names. 1168 * however, we are not sure if we want to perform 1169 * wildcard match, if gethostname(3) side has 1170 * truncated hostname. 1171 */ 1172 n = ni6_nametodns(hostname, hostnamelen, 0); 1173 if (!n || n->m_next || n->m_len == 0) 1174 goto bad; 1175 IP6_EXTHDR_GET(subj, char *, m, 1176 off + sizeof(struct icmp6_nodeinfo), subjlen); 1177 if (subj == NULL) 1178 goto bad; 1179 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *), 1180 n->m_len)) { 1181 goto bad; 1182 } 1183 m_freem(n); 1184 n = NULL; 1185 break; 1186 1187 case ICMP6_NI_SUBJ_IPV4: /* xxx: to be implemented? */ 1188 default: 1189 goto bad; 1190 } 1191 break; 1192 } 1193 1194 /* allocate a mbuf to reply. */ 1195 MGETHDR(n, M_DONTWAIT, m->m_type); 1196 if (n == NULL) { 1197 m_freem(m); 1198 return(NULL); 1199 } 1200 M_COPY_PKTHDR(n, m); /* just for recvif */ 1201 if (replylen > MHLEN) { 1202 if (replylen > MCLBYTES) { 1203 /* 1204 * XXX: should we try to allocate more? But MCLBYTES is 1205 * probably much larger than IPV6_MMTU... 1206 */ 1207 goto bad; 1208 } 1209 MCLGET(n, M_DONTWAIT); 1210 if ((n->m_flags & M_EXT) == 0) { 1211 goto bad; 1212 } 1213 } 1214 n->m_pkthdr.len = n->m_len = replylen; 1215 1216 /* copy mbuf header and IPv6 + Node Information base headers */ 1217 bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr)); 1218 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1); 1219 bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo)); 1220 1221 /* qtype dependent procedure */ 1222 switch (qtype) { 1223 case NI_QTYPE_NOOP: 1224 nni6->ni_code = ICMP6_NI_SUCCESS; 1225 nni6->ni_flags = 0; 1226 break; 1227 case NI_QTYPE_SUPTYPES: 1228 nni6->ni_code = ICMP6_NI_SUCCESS; 1229 nni6->ni_flags = htons(0x0000); /* raw bitmap */ 1230 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */ 1231 *(u_int32_t *)(nni6 + 1) = htonl(0x0000000f); 1232 break; 1233 case NI_QTYPE_FQDN: 1234 nni6->ni_code = ICMP6_NI_SUCCESS; 1235 fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) + 1236 sizeof(struct ip6_hdr) + 1237 sizeof(struct icmp6_nodeinfo)); 1238 nni6->ni_flags = 0; /* XXX: meaningless TTL */ 1239 fqdn->ni_fqdn_ttl = 0; /* ditto. */ 1240 /* 1241 * XXX do we really have FQDN in variable "hostname"? 1242 */ 1243 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn); 1244 if (n->m_next == NULL) 1245 goto bad; 1246 /* XXX we assume that n->m_next is not a chain */ 1247 if (n->m_next->m_next != NULL) 1248 goto bad; 1249 n->m_pkthdr.len += n->m_next->m_len; 1250 break; 1251 case NI_QTYPE_NODEADDR: 1252 { 1253 int lenlim, copied; 1254 1255 nni6->ni_code = ICMP6_NI_SUCCESS; 1256 if (n->m_flags & M_EXT) 1257 lenlim = MCLBYTES - sizeof(struct ip6_hdr) - 1258 sizeof(struct icmp6_nodeinfo); 1259 else 1260 lenlim = MHLEN - sizeof(struct ip6_hdr) - 1261 sizeof(struct icmp6_nodeinfo); 1262 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim); 1263 /* XXX: reset mbuf length */ 1264 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 1265 sizeof(struct icmp6_nodeinfo) + copied; 1266 break; 1267 } 1268 default: 1269 break; /* XXX impossible! */ 1270 } 1271 1272 nni6->ni_type = ICMP6_NI_REPLY; 1273 m_freem(m); 1274 return(n); 1275 1276 bad: 1277 m_freem(m); 1278 if (n) 1279 m_freem(n); 1280 return(NULL); 1281 } 1282 #undef hostnamelen 1283 1284 /* 1285 * make a mbuf with DNS-encoded string. no compression support. 1286 * 1287 * XXX names with less than 2 dots (like "foo" or "foo.section") will be 1288 * treated as truncated name (two \0 at the end). this is a wild guess. 1289 */ 1290 static struct mbuf * 1291 ni6_nametodns(name, namelen, old) 1292 const char *name; 1293 int namelen; 1294 int old; /* return pascal string if non-zero */ 1295 { 1296 struct mbuf *m; 1297 char *cp, *ep; 1298 const char *p, *q; 1299 int i, len, nterm; 1300 1301 if (old) 1302 len = namelen + 1; 1303 else 1304 len = MCLBYTES; 1305 1306 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */ 1307 MGET(m, M_DONTWAIT, MT_DATA); 1308 if (m && len > MLEN) { 1309 MCLGET(m, M_DONTWAIT); 1310 if ((m->m_flags & M_EXT) == 0) 1311 goto fail; 1312 } 1313 if (!m) 1314 goto fail; 1315 m->m_next = NULL; 1316 1317 if (old) { 1318 m->m_len = len; 1319 *mtod(m, char *) = namelen; 1320 bcopy(name, mtod(m, char *) + 1, namelen); 1321 return m; 1322 } else { 1323 m->m_len = 0; 1324 cp = mtod(m, char *); 1325 ep = mtod(m, char *) + M_TRAILINGSPACE(m); 1326 1327 /* if not certain about my name, return empty buffer */ 1328 if (namelen == 0) 1329 return m; 1330 1331 /* 1332 * guess if it looks like shortened hostname, or FQDN. 1333 * shortened hostname needs two trailing "\0". 1334 */ 1335 i = 0; 1336 for (p = name; p < name + namelen; p++) { 1337 if (*p && *p == '.') 1338 i++; 1339 } 1340 if (i < 2) 1341 nterm = 2; 1342 else 1343 nterm = 1; 1344 1345 p = name; 1346 while (cp < ep && p < name + namelen) { 1347 i = 0; 1348 for (q = p; q < name + namelen && *q && *q != '.'; q++) 1349 i++; 1350 /* result does not fit into mbuf */ 1351 if (cp + i + 1 >= ep) 1352 goto fail; 1353 /* DNS label length restriction, RFC1035 page 8 */ 1354 if (i >= 64) 1355 goto fail; 1356 *cp++ = i; 1357 bcopy(p, cp, i); 1358 cp += i; 1359 p = q; 1360 if (p < name + namelen && *p == '.') 1361 p++; 1362 } 1363 /* termination */ 1364 if (cp + nterm >= ep) 1365 goto fail; 1366 while (nterm-- > 0) 1367 *cp++ = '\0'; 1368 m->m_len = cp - mtod(m, char *); 1369 return m; 1370 } 1371 1372 panic("should not reach here"); 1373 /*NOTREACHED*/ 1374 1375 fail: 1376 if (m) 1377 m_freem(m); 1378 return NULL; 1379 } 1380 1381 /* 1382 * check if two DNS-encoded string matches. takes care of truncated 1383 * form (with \0\0 at the end). no compression support. 1384 * XXX upper/lowercase match (see RFC2065) 1385 */ 1386 static int 1387 ni6_dnsmatch(a, alen, b, blen) 1388 const char *a; 1389 int alen; 1390 const char *b; 1391 int blen; 1392 { 1393 const char *a0, *b0; 1394 int l; 1395 1396 /* simplest case - need validation? */ 1397 if (alen == blen && bcmp(a, b, alen) == 0) 1398 return 1; 1399 1400 a0 = a; 1401 b0 = b; 1402 1403 /* termination is mandatory */ 1404 if (alen < 2 || blen < 2) 1405 return 0; 1406 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0') 1407 return 0; 1408 alen--; 1409 blen--; 1410 1411 while (a - a0 < alen && b - b0 < blen) { 1412 if (a - a0 + 1 > alen || b - b0 + 1 > blen) 1413 return 0; 1414 1415 if ((signed char)a[0] < 0 || (signed char)b[0] < 0) 1416 return 0; 1417 /* we don't support compression yet */ 1418 if (a[0] >= 64 || b[0] >= 64) 1419 return 0; 1420 1421 /* truncated case */ 1422 if (a[0] == 0 && a - a0 == alen - 1) 1423 return 1; 1424 if (b[0] == 0 && b - b0 == blen - 1) 1425 return 1; 1426 if (a[0] == 0 || b[0] == 0) 1427 return 0; 1428 1429 if (a[0] != b[0]) 1430 return 0; 1431 l = a[0]; 1432 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen) 1433 return 0; 1434 if (bcmp(a + 1, b + 1, l) != 0) 1435 return 0; 1436 1437 a += 1 + l; 1438 b += 1 + l; 1439 } 1440 1441 if (a - a0 == alen && b - b0 == blen) 1442 return 1; 1443 else 1444 return 0; 1445 } 1446 1447 /* 1448 * calculate the number of addresses to be returned in the node info reply. 1449 */ 1450 static int 1451 ni6_addrs(ni6, m, ifpp) 1452 struct icmp6_nodeinfo *ni6; 1453 struct mbuf *m; 1454 struct ifnet **ifpp; 1455 { 1456 register struct ifnet *ifp; 1457 register struct in6_ifaddr *ifa6; 1458 register struct ifaddr *ifa; 1459 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1460 int addrs = 0, addrsofif, iffound = 0; 1461 1462 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) 1463 { 1464 addrsofif = 0; 1465 for (ifa = ifp->if_addrlist.tqh_first; ifa; 1466 ifa = ifa->ifa_list.tqe_next) 1467 { 1468 if (ifa->ifa_addr->sa_family != AF_INET6) 1469 continue; 1470 ifa6 = (struct in6_ifaddr *)ifa; 1471 1472 if (!(ni6->ni_flags & NI_NODEADDR_FLAG_ALL) && 1473 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 1474 &ifa6->ia_addr.sin6_addr)) 1475 iffound = 1; 1476 1477 /* 1478 * IPv4-mapped addresses can only be returned by a 1479 * Node Information proxy, since they represent 1480 * addresses of IPv4-only nodes, which perforce do 1481 * not implement this protocol. 1482 * [icmp-name-lookups-05] 1483 * So we don't support NI_NODEADDR_FLAG_COMPAT in 1484 * this function at this moment. 1485 */ 1486 1487 if (ifa6->ia6_flags & IN6_IFF_ANYCAST) 1488 continue; /* we need only unicast addresses */ 1489 1490 if ((ni6->ni_flags & (NI_NODEADDR_FLAG_LINKLOCAL | 1491 NI_NODEADDR_FLAG_SITELOCAL | 1492 NI_NODEADDR_FLAG_GLOBAL)) == 0) 1493 continue; 1494 1495 /* What do we have to do about ::1? */ 1496 switch(in6_addrscope(&ifa6->ia_addr.sin6_addr)) { 1497 case IPV6_ADDR_SCOPE_LINKLOCAL: 1498 if (ni6->ni_flags & NI_NODEADDR_FLAG_LINKLOCAL) 1499 addrsofif++; 1500 break; 1501 case IPV6_ADDR_SCOPE_SITELOCAL: 1502 if (ni6->ni_flags & NI_NODEADDR_FLAG_SITELOCAL) 1503 addrsofif++; 1504 break; 1505 case IPV6_ADDR_SCOPE_GLOBAL: 1506 if (ni6->ni_flags & NI_NODEADDR_FLAG_GLOBAL) 1507 addrsofif++; 1508 break; 1509 default: 1510 continue; 1511 } 1512 } 1513 if (iffound) { 1514 *ifpp = ifp; 1515 return(addrsofif); 1516 } 1517 1518 addrs += addrsofif; 1519 } 1520 1521 return(addrs); 1522 } 1523 1524 static int 1525 ni6_store_addrs(ni6, nni6, ifp0, resid) 1526 struct icmp6_nodeinfo *ni6, *nni6; 1527 struct ifnet *ifp0; 1528 int resid; 1529 { 1530 register struct ifnet *ifp = ifp0 ? ifp0 : TAILQ_FIRST(&ifnet); 1531 register struct in6_ifaddr *ifa6; 1532 register struct ifaddr *ifa; 1533 int docopy, copied = 0; 1534 u_char *cp = (u_char *)(nni6 + 1); 1535 1536 if (ifp0 == NULL && !(ni6->ni_flags & NI_NODEADDR_FLAG_ALL)) 1537 return(0); /* needless to copy */ 1538 1539 for (; ifp; ifp = TAILQ_NEXT(ifp, if_list)) 1540 { 1541 for (ifa = ifp->if_addrlist.tqh_first; ifa; 1542 ifa = ifa->ifa_list.tqe_next) 1543 { 1544 docopy = 0; 1545 1546 if (ifa->ifa_addr->sa_family != AF_INET6) 1547 continue; 1548 ifa6 = (struct in6_ifaddr *)ifa; 1549 1550 if (ifa6->ia6_flags & IN6_IFF_ANYCAST) { 1551 /* just experimental. not in the spec. */ 1552 if (ni6->ni_flags & NI_NODEADDR_FLAG_ANYCAST) 1553 docopy = 1; 1554 else 1555 continue; 1556 } 1557 else { /* unicast address */ 1558 if (ni6->ni_flags & NI_NODEADDR_FLAG_ANYCAST) 1559 continue; 1560 else 1561 docopy = 1; 1562 } 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 docopy = 1; 1569 break; 1570 case IPV6_ADDR_SCOPE_SITELOCAL: 1571 if (ni6->ni_flags & NI_NODEADDR_FLAG_SITELOCAL) 1572 docopy = 1; 1573 break; 1574 case IPV6_ADDR_SCOPE_GLOBAL: 1575 if (ni6->ni_flags & NI_NODEADDR_FLAG_GLOBAL) 1576 docopy = 1; 1577 break; 1578 default: 1579 continue; 1580 } 1581 1582 if (docopy) { 1583 if (resid < sizeof(struct in6_addr)) { 1584 /* 1585 * We give up much more copy. 1586 * Set the truncate flag and return. 1587 */ 1588 nni6->ni_flags |= 1589 NI_NODEADDR_FLAG_TRUNCATE; 1590 return(copied); 1591 } 1592 bcopy(&ifa6->ia_addr.sin6_addr, cp, 1593 sizeof(struct in6_addr)); 1594 /* XXX: KAME link-local hack; remove ifindex */ 1595 if (IN6_IS_ADDR_LINKLOCAL(&ifa6->ia_addr.sin6_addr)) 1596 ((struct in6_addr *)cp)->s6_addr16[1] = 0; 1597 cp += sizeof(struct in6_addr); 1598 resid -= sizeof(struct in6_addr); 1599 copied += sizeof(struct in6_addr); 1600 } 1601 } 1602 if (ifp0) /* we need search only on the specified IF */ 1603 break; 1604 } 1605 1606 return(copied); 1607 } 1608 1609 /* 1610 * XXX almost dup'ed code with rip6_input. 1611 */ 1612 static int 1613 icmp6_rip6_input(mp, off) 1614 struct mbuf **mp; 1615 int off; 1616 { 1617 struct mbuf *m = *mp; 1618 register struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1619 register struct in6pcb *in6p; 1620 struct in6pcb *last = NULL; 1621 struct sockaddr_in6 rip6src; 1622 struct icmp6_hdr *icmp6; 1623 struct mbuf *opts = NULL; 1624 1625 #ifndef PULLDOWN_TEST 1626 /* this is assumed to be safe. */ 1627 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off); 1628 #else 1629 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 1630 if (icmp6 == NULL) { 1631 /* m is already reclaimed */ 1632 return IPPROTO_DONE; 1633 } 1634 #endif 1635 1636 bzero(&rip6src, sizeof(rip6src)); 1637 rip6src.sin6_len = sizeof(struct sockaddr_in6); 1638 rip6src.sin6_family = AF_INET6; 1639 rip6src.sin6_addr = ip6->ip6_src; 1640 if (IN6_IS_SCOPE_LINKLOCAL(&rip6src.sin6_addr)) 1641 rip6src.sin6_addr.s6_addr16[1] = 0; 1642 if (m->m_pkthdr.rcvif) { 1643 if (IN6_IS_SCOPE_LINKLOCAL(&rip6src.sin6_addr)) 1644 rip6src.sin6_scope_id = m->m_pkthdr.rcvif->if_index; 1645 else 1646 rip6src.sin6_scope_id = 0; 1647 } else 1648 rip6src.sin6_scope_id = 0; 1649 1650 for (in6p = rawin6pcb.in6p_next; 1651 in6p != &rawin6pcb; in6p = in6p->in6p_next) 1652 { 1653 if (in6p->in6p_ip6_nxt != IPPROTO_ICMPV6) 1654 continue; 1655 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && 1656 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst)) 1657 continue; 1658 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) && 1659 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src)) 1660 continue; 1661 if (in6p->in6p_icmp6filt 1662 && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type, 1663 in6p->in6p_icmp6filt)) 1664 continue; 1665 if (last) { 1666 struct mbuf *n; 1667 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { 1668 if (last->in6p_flags & IN6P_CONTROLOPTS) 1669 ip6_savecontrol(last, &opts, ip6, n); 1670 /* strip intermediate headers */ 1671 m_adj(n, off); 1672 if (sbappendaddr(&last->in6p_socket->so_rcv, 1673 (struct sockaddr *)&rip6src, 1674 n, opts) == 0) { 1675 /* should notify about lost packet */ 1676 m_freem(n); 1677 if (opts) 1678 m_freem(opts); 1679 } else 1680 sorwakeup(last->in6p_socket); 1681 opts = NULL; 1682 } 1683 } 1684 last = in6p; 1685 } 1686 if (last) { 1687 if (last->in6p_flags & IN6P_CONTROLOPTS) 1688 ip6_savecontrol(last, &opts, ip6, m); 1689 /* strip intermediate headers */ 1690 m_adj(m, off); 1691 if (sbappendaddr(&last->in6p_socket->so_rcv, 1692 (struct sockaddr *)&rip6src, m, opts) == 0) { 1693 m_freem(m); 1694 if (opts) 1695 m_freem(opts); 1696 } else 1697 sorwakeup(last->in6p_socket); 1698 } else { 1699 m_freem(m); 1700 ip6stat.ip6s_delivered--; 1701 } 1702 return IPPROTO_DONE; 1703 } 1704 1705 /* 1706 * Reflect the ip6 packet back to the source. 1707 * OFF points to the icmp6 header, counted from the top of the mbuf. 1708 */ 1709 void 1710 icmp6_reflect(m, off) 1711 struct mbuf *m; 1712 size_t off; 1713 { 1714 struct ip6_hdr *ip6; 1715 struct icmp6_hdr *icmp6; 1716 struct in6_ifaddr *ia; 1717 struct in6_addr t, *src = 0; 1718 int plen; 1719 int type, code; 1720 struct ifnet *outif = NULL; 1721 struct sockaddr_in6 sa6_src; 1722 #ifdef COMPAT_RFC1885 1723 int mtu = IPV6_MMTU; 1724 struct sockaddr_in6 *sin6 = &icmp6_reflect_rt.ro_dst; 1725 #endif 1726 1727 /* too short to reflect */ 1728 if (off < sizeof(struct ip6_hdr)) { 1729 printf("sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n", 1730 (u_long)off, (u_long)sizeof(struct ip6_hdr), 1731 __FILE__, __LINE__); 1732 goto bad; 1733 } 1734 1735 /* 1736 * If there are extra headers between IPv6 and ICMPv6, strip 1737 * off that header first. 1738 */ 1739 #ifdef DIAGNOSTIC 1740 if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN) 1741 panic("assumption failed in icmp6_reflect"); 1742 #endif 1743 if (off > sizeof(struct ip6_hdr)) { 1744 size_t l; 1745 struct ip6_hdr nip6; 1746 1747 l = off - sizeof(struct ip6_hdr); 1748 m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6); 1749 m_adj(m, l); 1750 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 1751 if (m->m_len < l) { 1752 if ((m = m_pullup(m, l)) == NULL) 1753 return; 1754 } 1755 bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6)); 1756 } else /* off == sizeof(struct ip6_hdr) */ { 1757 size_t l; 1758 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 1759 if (m->m_len < l) { 1760 if ((m = m_pullup(m, l)) == NULL) 1761 return; 1762 } 1763 } 1764 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr); 1765 ip6 = mtod(m, struct ip6_hdr *); 1766 ip6->ip6_nxt = IPPROTO_ICMPV6; 1767 icmp6 = (struct icmp6_hdr *)(ip6 + 1); 1768 type = icmp6->icmp6_type; /* keep type for statistics */ 1769 code = icmp6->icmp6_code; /* ditto. */ 1770 1771 t = ip6->ip6_dst; 1772 /* 1773 * ip6_input() drops a packet if its src is multicast. 1774 * So, the src is never multicast. 1775 */ 1776 ip6->ip6_dst = ip6->ip6_src; 1777 1778 /* XXX hack for link-local addresses */ 1779 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst) && !ip6->ip6_dst.s6_addr16[1]) { 1780 if (!m->m_pkthdr.rcvif) 1781 goto bad; 1782 ip6->ip6_dst.s6_addr16[1] = 1783 htons(m->m_pkthdr.rcvif->if_index); 1784 } 1785 if (IN6_IS_ADDR_LINKLOCAL(&t) && !t.s6_addr16[1]) { 1786 if (!m->m_pkthdr.rcvif) 1787 goto bad; 1788 t.s6_addr16[1] = htons(m->m_pkthdr.rcvif->if_index); 1789 } 1790 bzero(&sa6_src, sizeof(sa6_src)); 1791 sa6_src.sin6_family = AF_INET6; 1792 sa6_src.sin6_len = sizeof(sa6_src); 1793 sa6_src.sin6_addr = ip6->ip6_dst; 1794 if (IN6_IS_SCOPE_LINKLOCAL(&sa6_src.sin6_addr)) { 1795 sa6_src.sin6_scope_id = ntohs(sa6_src.sin6_addr.s6_addr16[1]); 1796 sa6_src.sin6_addr.s6_addr16[1] = 0; 1797 } 1798 1799 #ifdef COMPAT_RFC1885 1800 /* 1801 * xxx guess MTU 1802 * RFC 1885 requires that echo reply should be truncated if it 1803 * does not fit in with (return) path MTU, but the description was 1804 * removed in the new spec. 1805 */ 1806 if (icmp6_reflect_rt.ro_rt == 0 || 1807 ! (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &ip6->ip6_dst))) { 1808 if (icmp6_reflect_rt.ro_rt) { 1809 RTFREE(icmp6_reflect_rt.ro_rt); 1810 icmp6_reflect_rt.ro_rt = 0; 1811 } 1812 bzero(sin6, sizeof(*sin6)); 1813 sin6->sin6_family = PF_INET6; 1814 sin6->sin6_len = sizeof(struct sockaddr_in6); 1815 sin6->sin6_addr = ip6->ip6_dst; 1816 1817 rtalloc((struct route *)&icmp6_reflect_rt.ro_rt); 1818 } 1819 1820 if (icmp6_reflect_rt.ro_rt == 0) 1821 goto bad; 1822 1823 if ((icmp6_reflect_rt.ro_rt->rt_flags & RTF_HOST) 1824 && mtu < icmp6_reflect_rt.ro_rt->rt_ifp->if_mtu) 1825 mtu = icmp6_reflect_rt.ro_rt->rt_rmx.rmx_mtu; 1826 1827 if (mtu < m->m_pkthdr.len) { 1828 plen -= (m->m_pkthdr.len - mtu); 1829 m_adj(m, mtu - m->m_pkthdr.len); 1830 } 1831 #endif 1832 /* 1833 * If the incoming packet was addressed directly to us(i.e. unicast), 1834 * use dst as the src for the reply. 1835 * The IN6_IFF_NOTREADY case would be VERY rare, but is possible 1836 * (for example) when we encounter an error while forwarding procedure 1837 * destined to a duplicated address of ours. 1838 */ 1839 for (ia = in6_ifaddr; ia; ia = ia->ia_next) 1840 if (IN6_ARE_ADDR_EQUAL(&t, &ia->ia_addr.sin6_addr) && 1841 (ia->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) { 1842 src = &t; 1843 break; 1844 } 1845 if (ia == NULL && IN6_IS_ADDR_LINKLOCAL(&t) && (m->m_flags & M_LOOP)) { 1846 /* 1847 * This is the case if the dst is our link-local address 1848 * and the sender is also ourseleves. 1849 */ 1850 src = &t; 1851 } 1852 1853 if (src == 0) { 1854 int e; 1855 struct route_in6 ro; 1856 1857 /* 1858 * This case matches to multicasts, our anycast, or unicasts 1859 * that we do not own. Select a source address based on the 1860 * source address of the erroneous packet. 1861 */ 1862 bzero(&ro, sizeof(ro)); 1863 src = in6_selectsrc(&sa6_src, NULL, NULL, &ro, NULL, &e); 1864 if (ro.ro_rt) 1865 RTFREE(ro.ro_rt); /* XXX: we could use this */ 1866 if (src == NULL) { 1867 log(LOG_DEBUG, 1868 "icmp6_reflect: source can't be determined: " 1869 "dst=%s, error=%d\n", 1870 ip6_sprintf(&sa6_src.sin6_addr), e); 1871 goto bad; 1872 } 1873 } 1874 1875 ip6->ip6_src = *src; 1876 1877 ip6->ip6_flow = 0; 1878 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 1879 ip6->ip6_vfc |= IPV6_VERSION; 1880 ip6->ip6_nxt = IPPROTO_ICMPV6; 1881 if (m->m_pkthdr.rcvif) { 1882 /* XXX: This may not be the outgoing interface */ 1883 ip6->ip6_hlim = nd_ifinfo[m->m_pkthdr.rcvif->if_index].chlim; 1884 } else 1885 ip6->ip6_hlim = ip6_defhlim; 1886 1887 icmp6->icmp6_cksum = 0; 1888 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6, 1889 sizeof(struct ip6_hdr), plen); 1890 1891 /* 1892 * xxx option handling 1893 */ 1894 1895 m->m_flags &= ~(M_BCAST|M_MCAST); 1896 #ifdef IPSEC 1897 /* Don't lookup socket */ 1898 (void)ipsec_setsocket(m, NULL); 1899 #endif /*IPSEC*/ 1900 1901 #ifdef COMPAT_RFC1885 1902 ip6_output(m, NULL, &icmp6_reflect_rt, 0, NULL, &outif); 1903 #else 1904 ip6_output(m, NULL, NULL, 0, NULL, &outif); 1905 #endif 1906 if (outif) 1907 icmp6_ifoutstat_inc(outif, type, code); 1908 1909 return; 1910 1911 bad: 1912 m_freem(m); 1913 return; 1914 } 1915 1916 void 1917 icmp6_fasttimo() 1918 { 1919 1920 mld6_fasttimeo(); 1921 } 1922 1923 static const char * 1924 icmp6_redirect_diag(src6, dst6, tgt6) 1925 struct in6_addr *src6; 1926 struct in6_addr *dst6; 1927 struct in6_addr *tgt6; 1928 { 1929 static char buf[1024]; 1930 snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)", 1931 ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6)); 1932 return buf; 1933 } 1934 1935 void 1936 icmp6_redirect_input(m, off) 1937 register struct mbuf *m; 1938 int off; 1939 { 1940 struct ifnet *ifp = m->m_pkthdr.rcvif; 1941 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1942 struct nd_redirect *nd_rd; 1943 int icmp6len = ntohs(ip6->ip6_plen); 1944 char *lladdr = NULL; 1945 int lladdrlen = 0; 1946 u_char *redirhdr = NULL; 1947 int redirhdrlen = 0; 1948 struct rtentry *rt = NULL; 1949 int is_router; 1950 int is_onlink; 1951 struct in6_addr src6 = ip6->ip6_src; 1952 struct in6_addr redtgt6; 1953 struct in6_addr reddst6; 1954 union nd_opts ndopts; 1955 1956 if (!m || !ifp) 1957 return; 1958 1959 /* XXX if we are router, we don't update route by icmp6 redirect */ 1960 if (ip6_forwarding) 1961 goto freeit; 1962 if (!icmp6_rediraccept) 1963 goto freeit; 1964 1965 #ifndef PULLDOWN_TEST 1966 IP6_EXTHDR_CHECK(m, off, icmp6len,); 1967 nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off); 1968 #else 1969 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len); 1970 if (nd_rd == NULL) { 1971 icmp6stat.icp6s_tooshort++; 1972 return; 1973 } 1974 #endif 1975 redtgt6 = nd_rd->nd_rd_target; 1976 reddst6 = nd_rd->nd_rd_dst; 1977 1978 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 1979 redtgt6.s6_addr16[1] = htons(ifp->if_index); 1980 if (IN6_IS_ADDR_LINKLOCAL(&reddst6)) 1981 reddst6.s6_addr16[1] = htons(ifp->if_index); 1982 1983 /* validation */ 1984 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) { 1985 nd6log((LOG_ERR, 1986 "ICMP6 redirect sent from %s rejected; " 1987 "must be from linklocal\n", ip6_sprintf(&src6))); 1988 goto freeit; 1989 } 1990 if (ip6->ip6_hlim != 255) { 1991 nd6log((LOG_ERR, 1992 "ICMP6 redirect sent from %s rejected; " 1993 "hlim=%d (must be 255)\n", 1994 ip6_sprintf(&src6), ip6->ip6_hlim)); 1995 goto freeit; 1996 } 1997 { 1998 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */ 1999 struct sockaddr_in6 sin6; 2000 struct in6_addr *gw6; 2001 2002 bzero(&sin6, sizeof(sin6)); 2003 sin6.sin6_family = AF_INET6; 2004 sin6.sin6_len = sizeof(struct sockaddr_in6); 2005 bcopy(&reddst6, &sin6.sin6_addr, sizeof(reddst6)); 2006 rt = rtalloc1((struct sockaddr *)&sin6, 0); 2007 if (rt) { 2008 if (rt->rt_gateway == NULL || 2009 rt->rt_gateway->sa_family != AF_INET6) { 2010 nd6log((LOG_ERR, 2011 "ICMP6 redirect rejected; no route " 2012 "with inet6 gateway found for redirect dst: %s\n", 2013 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2014 RTFREE(rt); 2015 goto freeit; 2016 } 2017 2018 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr); 2019 if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) { 2020 nd6log((LOG_ERR, 2021 "ICMP6 redirect rejected; " 2022 "not equal to gw-for-src=%s (must be same): " 2023 "%s\n", 2024 ip6_sprintf(gw6), 2025 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2026 RTFREE(rt); 2027 goto freeit; 2028 } 2029 } else { 2030 nd6log((LOG_ERR, 2031 "ICMP6 redirect rejected; " 2032 "no route found for redirect dst: %s\n", 2033 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2034 goto freeit; 2035 } 2036 RTFREE(rt); 2037 rt = NULL; 2038 } 2039 if (IN6_IS_ADDR_MULTICAST(&reddst6)) { 2040 nd6log((LOG_ERR, 2041 "ICMP6 redirect rejected; " 2042 "redirect dst must be unicast: %s\n", 2043 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2044 goto freeit; 2045 } 2046 2047 is_router = is_onlink = 0; 2048 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 2049 is_router = 1; /* router case */ 2050 if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0) 2051 is_onlink = 1; /* on-link destination case */ 2052 if (!is_router && !is_onlink) { 2053 nd6log((LOG_ERR, 2054 "ICMP6 redirect rejected; " 2055 "neither router case nor onlink case: %s\n", 2056 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2057 goto freeit; 2058 } 2059 /* validation passed */ 2060 2061 icmp6len -= sizeof(*nd_rd); 2062 nd6_option_init(nd_rd + 1, icmp6len, &ndopts); 2063 if (nd6_options(&ndopts) < 0) { 2064 nd6log((LOG_INFO, "icmp6_redirect_input: " 2065 "invalid ND option, rejected: %s\n", 2066 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2067 goto freeit; 2068 } 2069 2070 if (ndopts.nd_opts_tgt_lladdr) { 2071 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 2072 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 2073 } 2074 2075 if (ndopts.nd_opts_rh) { 2076 redirhdrlen = ndopts.nd_opts_rh->nd_opt_rh_len; 2077 redirhdr = (u_char *)(ndopts.nd_opts_rh + 1); /* xxx */ 2078 } 2079 2080 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 2081 nd6log((LOG_INFO, 2082 "icmp6_redirect_input: lladdrlen mismatch for %s " 2083 "(if %d, icmp6 packet %d): %s\n", 2084 ip6_sprintf(&redtgt6), ifp->if_addrlen, lladdrlen - 2, 2085 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 2086 goto freeit; 2087 } 2088 2089 /* RFC 2461 8.3 */ 2090 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT, 2091 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER); 2092 2093 if (!is_onlink) { /* better router case. perform rtredirect. */ 2094 /* perform rtredirect */ 2095 struct sockaddr_in6 sdst; 2096 struct sockaddr_in6 sgw; 2097 struct sockaddr_in6 ssrc; 2098 2099 bzero(&sdst, sizeof(sdst)); 2100 bzero(&sgw, sizeof(sgw)); 2101 bzero(&ssrc, sizeof(ssrc)); 2102 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6; 2103 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len = 2104 sizeof(struct sockaddr_in6); 2105 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr)); 2106 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2107 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr)); 2108 rtredirect((struct sockaddr *)&sdst, (struct sockaddr *)&sgw, 2109 (struct sockaddr *)NULL, RTF_GATEWAY | RTF_HOST, 2110 (struct sockaddr *)&ssrc, 2111 (struct rtentry **)NULL 2112 ); 2113 } 2114 /* finally update cached route in each socket via pfctlinput */ 2115 { 2116 struct sockaddr_in6 sdst; 2117 #if 1 2118 #else 2119 struct ip6protosw *pr; 2120 #endif 2121 2122 bzero(&sdst, sizeof(sdst)); 2123 sdst.sin6_family = AF_INET6; 2124 sdst.sin6_len = sizeof(struct sockaddr_in6); 2125 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2126 #if 1 2127 pfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst); 2128 #else 2129 /* 2130 * do not use pfctlinput() here, we have different prototype for 2131 * xx_ctlinput() in ip6proto. 2132 */ 2133 for (pr = (struct ip6protosw *)inet6domain.dom_protosw; 2134 pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; 2135 pr++) { 2136 if (pr->pr_ctlinput) { 2137 (*pr->pr_ctlinput)(PRC_REDIRECT_HOST, 2138 (struct sockaddr *)&sdst, NULL, NULL, 0); 2139 } 2140 } 2141 #endif 2142 #ifdef IPSEC 2143 key_sa_routechange((struct sockaddr *)&sdst); 2144 #endif 2145 } 2146 2147 freeit: 2148 m_freem(m); 2149 } 2150 2151 void 2152 icmp6_redirect_output(m0, rt) 2153 struct mbuf *m0; 2154 struct rtentry *rt; 2155 { 2156 struct ifnet *ifp; /* my outgoing interface */ 2157 struct in6_addr *ifp_ll6; 2158 struct in6_addr *router_ll6; 2159 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */ 2160 struct mbuf *m = NULL; /* newly allocated one */ 2161 struct ip6_hdr *ip6; /* m as struct ip6_hdr */ 2162 struct nd_redirect *nd_rd; 2163 size_t maxlen; 2164 u_char *p; 2165 struct ifnet *outif = NULL; 2166 struct sockaddr_in6 src_sa; 2167 2168 /* if we are not router, we don't send icmp6 redirect */ 2169 if (!ip6_forwarding || ip6_accept_rtadv) 2170 goto fail; 2171 2172 /* sanity check */ 2173 if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp)) 2174 goto fail; 2175 2176 /* 2177 * Address check: 2178 * the source address must identify a neighbor, and 2179 * the destination address must not be a multicast address 2180 * [RFC 2461, sec 8.2] 2181 */ 2182 sip6 = mtod(m0, struct ip6_hdr *); 2183 bzero(&src_sa, sizeof(src_sa)); 2184 src_sa.sin6_family = AF_INET6; 2185 src_sa.sin6_len = sizeof(src_sa); 2186 src_sa.sin6_addr = sip6->ip6_src; 2187 /* we don't currently use sin6_scope_id, but eventually use it */ 2188 src_sa.sin6_scope_id = in6_addr2scopeid(ifp, &sip6->ip6_src); 2189 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0) 2190 goto fail; 2191 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst)) 2192 goto fail; /* what should we do here? */ 2193 2194 /* rate limit */ 2195 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0)) 2196 goto fail; 2197 2198 /* 2199 * Since we are going to append up to 1280 bytes (= IPV6_MMTU), 2200 * we almost always ask for an mbuf cluster for simplicity. 2201 * (MHLEN < IPV6_MMTU is almost always true) 2202 */ 2203 #if IPV6_MMTU >= MCLBYTES 2204 # error assumption failed about IPV6_MMTU and MCLBYTES 2205 #endif 2206 MGETHDR(m, M_DONTWAIT, MT_HEADER); 2207 if (m && IPV6_MMTU >= MHLEN) 2208 MCLGET(m, M_DONTWAIT); 2209 if (!m) 2210 goto fail; 2211 maxlen = (m->m_flags & M_EXT) ? MCLBYTES : MHLEN; 2212 maxlen = min(IPV6_MMTU, maxlen); 2213 /* just for safety */ 2214 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) + 2215 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) { 2216 goto fail; 2217 } 2218 2219 { 2220 /* get ip6 linklocal address for ifp(my outgoing interface). */ 2221 struct in6_ifaddr *ia; 2222 if ((ia = in6ifa_ifpforlinklocal(ifp, 2223 IN6_IFF_NOTREADY| 2224 IN6_IFF_ANYCAST)) == NULL) 2225 goto fail; 2226 ifp_ll6 = &ia->ia_addr.sin6_addr; 2227 } 2228 2229 /* get ip6 linklocal address for the router. */ 2230 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) { 2231 struct sockaddr_in6 *sin6; 2232 sin6 = (struct sockaddr_in6 *)rt->rt_gateway; 2233 router_ll6 = &sin6->sin6_addr; 2234 if (!IN6_IS_ADDR_LINKLOCAL(router_ll6)) 2235 router_ll6 = (struct in6_addr *)NULL; 2236 } else 2237 router_ll6 = (struct in6_addr *)NULL; 2238 2239 /* ip6 */ 2240 ip6 = mtod(m, struct ip6_hdr *); 2241 ip6->ip6_flow = 0; 2242 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2243 ip6->ip6_vfc |= IPV6_VERSION; 2244 /* ip6->ip6_plen will be set later */ 2245 ip6->ip6_nxt = IPPROTO_ICMPV6; 2246 ip6->ip6_hlim = 255; 2247 /* ip6->ip6_src must be linklocal addr for my outgoing if. */ 2248 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr)); 2249 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr)); 2250 2251 /* ND Redirect */ 2252 nd_rd = (struct nd_redirect *)(ip6 + 1); 2253 nd_rd->nd_rd_type = ND_REDIRECT; 2254 nd_rd->nd_rd_code = 0; 2255 nd_rd->nd_rd_reserved = 0; 2256 if (rt->rt_flags & RTF_GATEWAY) { 2257 /* 2258 * nd_rd->nd_rd_target must be a link-local address in 2259 * better router cases. 2260 */ 2261 if (!router_ll6) 2262 goto fail; 2263 bcopy(router_ll6, &nd_rd->nd_rd_target, 2264 sizeof(nd_rd->nd_rd_target)); 2265 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2266 sizeof(nd_rd->nd_rd_dst)); 2267 } else { 2268 /* make sure redtgt == reddst */ 2269 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target, 2270 sizeof(nd_rd->nd_rd_target)); 2271 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2272 sizeof(nd_rd->nd_rd_dst)); 2273 } 2274 2275 p = (u_char *)(nd_rd + 1); 2276 2277 if (!router_ll6) 2278 goto nolladdropt; 2279 2280 { 2281 /* target lladdr option */ 2282 struct rtentry *rt_router = NULL; 2283 int len; 2284 struct sockaddr_dl *sdl; 2285 struct nd_opt_hdr *nd_opt; 2286 char *lladdr; 2287 2288 rt_router = nd6_lookup(router_ll6, 0, ifp); 2289 if (!rt_router) 2290 goto nolladdropt; 2291 len = sizeof(*nd_opt) + ifp->if_addrlen; 2292 len = (len + 7) & ~7; /*round by 8*/ 2293 /* safety check */ 2294 if (len + (p - (u_char *)ip6) > maxlen) 2295 goto nolladdropt; 2296 if (!(rt_router->rt_flags & RTF_GATEWAY) && 2297 (rt_router->rt_flags & RTF_LLINFO) && 2298 (rt_router->rt_gateway->sa_family == AF_LINK) && 2299 (sdl = (struct sockaddr_dl *)rt_router->rt_gateway) && 2300 sdl->sdl_alen) { 2301 nd_opt = (struct nd_opt_hdr *)p; 2302 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 2303 nd_opt->nd_opt_len = len >> 3; 2304 lladdr = (char *)(nd_opt + 1); 2305 bcopy(LLADDR(sdl), lladdr, ifp->if_addrlen); 2306 p += len; 2307 } 2308 } 2309 nolladdropt:; 2310 2311 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2312 2313 /* just to be safe */ 2314 if (m0->m_flags & M_DECRYPTED) 2315 goto noredhdropt; 2316 if (p - (u_char *)ip6 > maxlen) 2317 goto noredhdropt; 2318 2319 { 2320 /* redirected header option */ 2321 int len; 2322 struct nd_opt_rd_hdr *nd_opt_rh; 2323 2324 /* 2325 * compute the maximum size for icmp6 redirect header option. 2326 * XXX room for auth header? 2327 */ 2328 len = maxlen - (p - (u_char *)ip6); 2329 len &= ~7; 2330 2331 /* This is just for simplicity. */ 2332 if (m0->m_pkthdr.len != m0->m_len) { 2333 if (m0->m_next) { 2334 m_freem(m0->m_next); 2335 m0->m_next = NULL; 2336 } 2337 m0->m_pkthdr.len = m0->m_len; 2338 } 2339 2340 /* 2341 * Redirected header option spec (RFC2461 4.6.3) talks nothing 2342 * about padding/truncate rule for the original IP packet. 2343 * From the discussion on IPv6imp in Feb 1999, the consensus was: 2344 * - "attach as much as possible" is the goal 2345 * - pad if not aligned (original size can be guessed by original 2346 * ip6 header) 2347 * Following code adds the padding if it is simple enough, 2348 * and truncates if not. 2349 */ 2350 if (m0->m_next || m0->m_pkthdr.len != m0->m_len) 2351 panic("assumption failed in %s:%d\n", __FILE__, __LINE__); 2352 2353 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) { 2354 /* not enough room, truncate */ 2355 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh); 2356 } else { 2357 /* enough room, pad or truncate */ 2358 size_t extra; 2359 2360 extra = m0->m_pkthdr.len % 8; 2361 if (extra) { 2362 /* pad if easy enough, truncate if not */ 2363 if (8 - extra <= M_TRAILINGSPACE(m0)) { 2364 /* pad */ 2365 m0->m_len += (8 - extra); 2366 m0->m_pkthdr.len += (8 - extra); 2367 } else { 2368 /* truncate */ 2369 m0->m_pkthdr.len -= extra; 2370 m0->m_len -= extra; 2371 } 2372 } 2373 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh); 2374 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh); 2375 } 2376 2377 nd_opt_rh = (struct nd_opt_rd_hdr *)p; 2378 bzero(nd_opt_rh, sizeof(*nd_opt_rh)); 2379 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER; 2380 nd_opt_rh->nd_opt_rh_len = len >> 3; 2381 p += sizeof(*nd_opt_rh); 2382 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2383 2384 /* connect m0 to m */ 2385 m->m_next = m0; 2386 m->m_pkthdr.len = m->m_len + m0->m_len; 2387 } 2388 noredhdropt:; 2389 2390 if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_src)) 2391 sip6->ip6_src.s6_addr16[1] = 0; 2392 if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_dst)) 2393 sip6->ip6_dst.s6_addr16[1] = 0; 2394 #if 0 2395 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src)) 2396 ip6->ip6_src.s6_addr16[1] = 0; 2397 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) 2398 ip6->ip6_dst.s6_addr16[1] = 0; 2399 #endif 2400 if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_target)) 2401 nd_rd->nd_rd_target.s6_addr16[1] = 0; 2402 if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_dst)) 2403 nd_rd->nd_rd_dst.s6_addr16[1] = 0; 2404 2405 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 2406 2407 nd_rd->nd_rd_cksum = 0; 2408 nd_rd->nd_rd_cksum 2409 = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen)); 2410 2411 /* send the packet to outside... */ 2412 #ifdef IPSEC 2413 /* Don't lookup socket */ 2414 (void)ipsec_setsocket(m, NULL); 2415 #endif /*IPSEC*/ 2416 ip6_output(m, NULL, NULL, 0, NULL, &outif); 2417 if (outif) { 2418 icmp6_ifstat_inc(outif, ifs6_out_msg); 2419 icmp6_ifstat_inc(outif, ifs6_out_redirect); 2420 } 2421 icmp6stat.icp6s_outhist[ND_REDIRECT]++; 2422 2423 return; 2424 2425 fail: 2426 if (m) 2427 m_freem(m); 2428 if (m0) 2429 m_freem(m0); 2430 } 2431 2432 /* 2433 * ICMPv6 socket option processing. 2434 */ 2435 int 2436 icmp6_ctloutput(op, so, level, optname, mp) 2437 int op; 2438 struct socket *so; 2439 int level, optname; 2440 struct mbuf **mp; 2441 { 2442 register struct in6pcb *in6p = sotoin6pcb(so); 2443 register struct mbuf *m = *mp; 2444 int error = 0; 2445 2446 if (level != IPPROTO_ICMPV6) { 2447 error = EINVAL; 2448 if (op == PRCO_SETOPT && m) 2449 (void)m_free(m); 2450 } else switch(op) { 2451 case PRCO_SETOPT: 2452 switch (optname) { 2453 case ICMP6_FILTER: 2454 { 2455 struct icmp6_filter *p; 2456 2457 p = mtod(m, struct icmp6_filter *); 2458 if (!p || !in6p->in6p_icmp6filt) { 2459 error = EINVAL; 2460 break; 2461 } 2462 bcopy(p, in6p->in6p_icmp6filt, 2463 sizeof(struct icmp6_filter)); 2464 error = 0; 2465 break; 2466 } 2467 2468 default: 2469 error = ENOPROTOOPT; 2470 break; 2471 } 2472 if (m) 2473 (void)m_free(m); 2474 break; 2475 2476 case PRCO_GETOPT: 2477 switch (optname) { 2478 case ICMP6_FILTER: 2479 { 2480 struct icmp6_filter *p; 2481 2482 if (!in6p->in6p_icmp6filt) { 2483 error = EINVAL; 2484 break; 2485 } 2486 *mp = m = m_get(M_WAIT, MT_SOOPTS); 2487 m->m_len = sizeof(struct icmp6_filter); 2488 p = mtod(m, struct icmp6_filter *); 2489 bcopy(in6p->in6p_icmp6filt, p, 2490 sizeof(struct icmp6_filter)); 2491 error = 0; 2492 break; 2493 } 2494 2495 default: 2496 error = ENOPROTOOPT; 2497 break; 2498 } 2499 break; 2500 } 2501 2502 return(error); 2503 } 2504 2505 /* 2506 * Perform rate limit check. 2507 * Returns 0 if it is okay to send the icmp6 packet. 2508 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate 2509 * limitation. 2510 * 2511 * XXX per-destination/type check necessary? 2512 */ 2513 static int 2514 icmp6_ratelimit(dst, type, code) 2515 const struct in6_addr *dst; /* not used at this moment */ 2516 const int type; /* not used at this moment */ 2517 const int code; /* not used at this moment */ 2518 { 2519 int ret; 2520 2521 ret = 0; /*okay to send*/ 2522 2523 /* PPS limit */ 2524 if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count, 2525 icmp6errppslim)) { 2526 /* The packet is subject to rate limit */ 2527 ret++; 2528 } 2529 2530 return ret; 2531 } 2532 2533 static struct rtentry * 2534 icmp6_mtudisc_clone(dst) 2535 struct sockaddr *dst; 2536 { 2537 struct rtentry *rt; 2538 int error; 2539 2540 rt = rtalloc1(dst, 1); 2541 if (rt == 0) 2542 return NULL; 2543 2544 /* If we didn't get a host route, allocate one */ 2545 if ((rt->rt_flags & RTF_HOST) == 0) { 2546 struct rtentry *nrt; 2547 2548 error = rtrequest((int) RTM_ADD, dst, 2549 (struct sockaddr *) rt->rt_gateway, 2550 (struct sockaddr *) 0, 2551 RTF_GATEWAY | RTF_HOST | RTF_DYNAMIC, &nrt); 2552 if (error) { 2553 rtfree(rt); 2554 rtfree(nrt); 2555 return NULL; 2556 } 2557 nrt->rt_rmx = rt->rt_rmx; 2558 rtfree(rt); 2559 rt = nrt; 2560 } 2561 error = rt_timer_add(rt, icmp6_mtudisc_timeout, 2562 icmp6_mtudisc_timeout_q); 2563 if (error) { 2564 rtfree(rt); 2565 return NULL; 2566 } 2567 2568 return rt; /* caller need to call rtfree() */ 2569 } 2570 2571 static void 2572 icmp6_mtudisc_timeout(rt, r) 2573 struct rtentry *rt; 2574 struct rttimer *r; 2575 { 2576 if (rt == NULL) 2577 panic("icmp6_mtudisc_timeout: bad route to timeout"); 2578 if ((rt->rt_flags & (RTF_DYNAMIC | RTF_HOST)) == 2579 (RTF_DYNAMIC | RTF_HOST)) { 2580 rtrequest((int) RTM_DELETE, (struct sockaddr *)rt_key(rt), 2581 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0); 2582 } else { 2583 if ((rt->rt_rmx.rmx_locks & RTV_MTU) == 0) { 2584 rt->rt_rmx.rmx_mtu = 0; 2585 } 2586 } 2587 } 2588 2589 #include <vm/vm.h> 2590 #include <sys/sysctl.h> 2591 int 2592 icmp6_sysctl(name, namelen, oldp, oldlenp, newp, newlen) 2593 int *name; 2594 u_int namelen; 2595 void *oldp; 2596 size_t *oldlenp; 2597 void *newp; 2598 size_t newlen; 2599 { 2600 2601 /* All sysctl names at this level are terminal. */ 2602 if (namelen != 1) 2603 return ENOTDIR; 2604 2605 switch (name[0]) { 2606 2607 case ICMPV6CTL_REDIRACCEPT: 2608 return sysctl_int(oldp, oldlenp, newp, newlen, 2609 &icmp6_rediraccept); 2610 case ICMPV6CTL_REDIRTIMEOUT: 2611 return sysctl_int(oldp, oldlenp, newp, newlen, 2612 &icmp6_redirtimeout); 2613 case ICMPV6CTL_STATS: 2614 return sysctl_rdstruct(oldp, oldlenp, newp, 2615 &icmp6stat, sizeof(icmp6stat)); 2616 case ICMPV6CTL_ND6_PRUNE: 2617 return sysctl_int(oldp, oldlenp, newp, newlen, &nd6_prune); 2618 case ICMPV6CTL_ND6_DELAY: 2619 return sysctl_int(oldp, oldlenp, newp, newlen, &nd6_delay); 2620 case ICMPV6CTL_ND6_UMAXTRIES: 2621 return sysctl_int(oldp, oldlenp, newp, newlen, &nd6_umaxtries); 2622 case ICMPV6CTL_ND6_MMAXTRIES: 2623 return sysctl_int(oldp, oldlenp, newp, newlen, &nd6_mmaxtries); 2624 case ICMPV6CTL_ND6_USELOOPBACK: 2625 return sysctl_int(oldp, oldlenp, newp, newlen, 2626 &nd6_useloopback); 2627 case ICMPV6CTL_NODEINFO: 2628 return sysctl_int(oldp, oldlenp, newp, newlen, &icmp6_nodeinfo); 2629 case ICMPV6CTL_ERRPPSLIMIT: 2630 return sysctl_int(oldp, oldlenp, newp, newlen, &icmp6errppslim); 2631 case ICMPV6CTL_ND6_MAXNUDHINT: 2632 return sysctl_int(oldp, oldlenp, newp, newlen, 2633 &nd6_maxnudhint); 2634 default: 2635 return ENOPROTOOPT; 2636 } 2637 /* NOTREACHED */ 2638 } 2639
Indexes created Thu Oct 16 14:10:15 GMT 2025