icmp6.c revision 1.34
1 /* $NetBSD: icmp6.c,v 1.34 2000/06/28 03:04:03 mrg Exp $ */ 2 /* $KAME: icmp6.c,v 1.113 2000/06/12 09:24:41 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 #include <netkey/key_debug.h> 104 #endif 105 106 #include "faith.h" 107 108 #include <net/net_osdep.h> 109 110 extern struct domain inet6domain; 111 112 struct icmp6stat icmp6stat; 113 114 extern struct in6pcb rawin6pcb; 115 extern struct timeval icmp6errratelim; 116 extern int icmp6_nodeinfo; 117 static struct rttimer_queue *icmp6_mtudisc_timeout_q = NULL; 118 extern int pmtu_expire; 119 120 static int icmp6_rip6_input __P((struct mbuf **, int)); 121 static void icmp6_mtudisc_update __P((struct in6_addr *, struct icmp6_hdr *, 122 struct mbuf *)); 123 static int icmp6_ratelimit __P((const struct in6_addr *, const int, const int)); 124 static const char *icmp6_redirect_diag __P((struct in6_addr *, 125 struct in6_addr *, struct in6_addr *)); 126 static struct mbuf *ni6_input __P((struct mbuf *, int)); 127 static struct mbuf *ni6_nametodns __P((const char *, int, int)); 128 static int ni6_dnsmatch __P((const char *, int, const char *, int)); 129 static int ni6_addrs __P((struct icmp6_nodeinfo *, struct mbuf *, 130 struct ifnet **)); 131 static int ni6_store_addrs __P((struct icmp6_nodeinfo *, struct icmp6_nodeinfo *, 132 struct ifnet *, int)); 133 static struct rtentry *icmp6_mtudisc_clone __P((struct sockaddr *)); 134 static void icmp6_mtudisc_timeout __P((struct rtentry *, struct rttimer *)); 135 136 #ifdef COMPAT_RFC1885 137 static struct route_in6 icmp6_reflect_rt; 138 #endif 139 140 void 141 icmp6_init() 142 { 143 mld6_init(); 144 icmp6_mtudisc_timeout_q = rt_timer_queue_create(pmtu_expire); 145 } 146 147 /* 148 * Generate an error packet of type error in response to bad IP6 packet. 149 */ 150 void 151 icmp6_error(m, type, code, param) 152 struct mbuf *m; 153 int type, code, param; 154 { 155 struct ip6_hdr *oip6, *nip6; 156 struct icmp6_hdr *icmp6; 157 u_int preplen; 158 int off; 159 int nxt; 160 161 icmp6stat.icp6s_error++; 162 163 if (m->m_flags & M_DECRYPTED) { 164 icmp6stat.icp6s_canterror++; 165 goto freeit; 166 } 167 168 #ifndef PULLDOWN_TEST 169 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), ); 170 #else 171 if (m->m_len < sizeof(struct ip6_hdr)) { 172 m = m_pullup(m, sizeof(struct ip6_hdr)); 173 if (m == NULL) 174 return; 175 } 176 #endif 177 oip6 = mtod(m, struct ip6_hdr *); 178 179 /* 180 * Multicast destination check. For unrecognized option errors, 181 * this check has already done in ip6_unknown_opt(), so we can 182 * check only for other errors. 183 */ 184 if ((m->m_flags & (M_BCAST|M_MCAST) || 185 IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) && 186 (type != ICMP6_PACKET_TOO_BIG && 187 (type != ICMP6_PARAM_PROB || 188 code != ICMP6_PARAMPROB_OPTION))) 189 goto freeit; 190 191 /* Source address check. XXX: the case of anycast source? */ 192 if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) || 193 IN6_IS_ADDR_MULTICAST(&oip6->ip6_src)) 194 goto freeit; 195 196 /* 197 * If we are about to send ICMPv6 against ICMPv6 error/redirect, 198 * don't do it. 199 */ 200 nxt = -1; 201 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 202 if (off >= 0 && nxt == IPPROTO_ICMPV6) { 203 struct icmp6_hdr *icp; 204 205 #ifndef PULLDOWN_TEST 206 IP6_EXTHDR_CHECK(m, 0, off + sizeof(struct icmp6_hdr), ); 207 icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 208 #else 209 IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off, 210 sizeof(*icp)); 211 if (icp == NULL) { 212 icmp6stat.icp6s_tooshort++; 213 return; 214 } 215 #endif 216 if (icp->icmp6_type < ICMP6_ECHO_REQUEST || 217 icp->icmp6_type == ND_REDIRECT) { 218 /* 219 * ICMPv6 error 220 * Special case: for redirect (which is 221 * informational) we must not send icmp6 error. 222 */ 223 icmp6stat.icp6s_canterror++; 224 goto freeit; 225 } else { 226 /* ICMPv6 informational - send the error */ 227 } 228 } else { 229 /* non-ICMPv6 - send the error */ 230 } 231 232 oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */ 233 234 /* Finally, do rate limitation check. */ 235 if (icmp6_ratelimit(&oip6->ip6_src, type, code)) { 236 icmp6stat.icp6s_toofreq++; 237 goto freeit; 238 } 239 240 /* 241 * OK, ICMP6 can be generated. 242 */ 243 244 if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN) 245 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len); 246 247 preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 248 M_PREPEND(m, preplen, M_DONTWAIT); 249 if (m && m->m_len < preplen) 250 m = m_pullup(m, preplen); 251 if (m == NULL) { 252 printf("ENOBUFS in icmp6_error %d\n", __LINE__); 253 return; 254 } 255 256 nip6 = mtod(m, struct ip6_hdr *); 257 nip6->ip6_src = oip6->ip6_src; 258 nip6->ip6_dst = oip6->ip6_dst; 259 260 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_src)) 261 oip6->ip6_src.s6_addr16[1] = 0; 262 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_dst)) 263 oip6->ip6_dst.s6_addr16[1] = 0; 264 265 icmp6 = (struct icmp6_hdr *)(nip6 + 1); 266 icmp6->icmp6_type = type; 267 icmp6->icmp6_code = code; 268 icmp6->icmp6_pptr = htonl((u_int32_t)param); 269 270 icmp6stat.icp6s_outhist[type]++; 271 icmp6_reflect(m, sizeof(struct ip6_hdr)); /*header order: IPv6 - ICMPv6*/ 272 273 return; 274 275 freeit: 276 /* 277 * If we can't tell wheter or not we can generate ICMP6, free it. 278 */ 279 m_freem(m); 280 } 281 282 /* 283 * Process a received ICMP6 message. 284 */ 285 int 286 icmp6_input(mp, offp, proto) 287 struct mbuf **mp; 288 int *offp, proto; 289 { 290 struct mbuf *m = *mp, *n; 291 struct ip6_hdr *ip6, *nip6; 292 struct icmp6_hdr *icmp6, *nicmp6; 293 int off = *offp; 294 int icmp6len = m->m_pkthdr.len - *offp; 295 int code, sum, noff; 296 struct sockaddr_in6 icmp6src; 297 298 #ifndef PULLDOWN_TEST 299 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr), IPPROTO_DONE); 300 /* m might change if M_LOOP. So, call mtod after this */ 301 #endif 302 303 /* 304 * Locate icmp6 structure in mbuf, and check 305 * that not corrupted and of at least minimum length 306 */ 307 308 ip6 = mtod(m, struct ip6_hdr *); 309 if (icmp6len < sizeof(struct icmp6_hdr)) { 310 icmp6stat.icp6s_tooshort++; 311 goto freeit; 312 } 313 314 /* 315 * calculate the checksum 316 */ 317 #ifndef PULLDOWN_TEST 318 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off); 319 #else 320 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 321 if (icmp6 == NULL) { 322 icmp6stat.icp6s_tooshort++; 323 return IPPROTO_DONE; 324 } 325 #endif 326 code = icmp6->icmp6_code; 327 328 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) { 329 log(LOG_ERR, 330 "ICMP6 checksum error(%d|%x) %s\n", 331 icmp6->icmp6_type, 332 sum, 333 ip6_sprintf(&ip6->ip6_src)); 334 icmp6stat.icp6s_checksum++; 335 goto freeit; 336 } 337 338 #if defined(NFAITH) && 0 < NFAITH 339 if (m->m_pkthdr.rcvif && m->m_pkthdr.rcvif->if_type == IFT_FAITH) { 340 /* 341 * Deliver very specific ICMP6 type only. 342 * This is important to deilver TOOBIG. Otherwise PMTUD 343 * will not work. 344 */ 345 switch (icmp6->icmp6_type) { 346 case ICMP6_DST_UNREACH: 347 case ICMP6_PACKET_TOO_BIG: 348 case ICMP6_TIME_EXCEEDED: 349 break; 350 default: 351 goto freeit; 352 } 353 } 354 #endif 355 356 #ifdef IPSEC 357 /* drop it if it does not match the default policy */ 358 if (ipsec6_in_reject(m, NULL)) { 359 ipsecstat.in_polvio++; 360 goto freeit; 361 } 362 #endif 363 364 icmp6stat.icp6s_inhist[icmp6->icmp6_type]++; 365 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_msg); 366 if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK) 367 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error); 368 369 switch (icmp6->icmp6_type) { 370 371 case ICMP6_DST_UNREACH: 372 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_dstunreach); 373 switch (code) { 374 case ICMP6_DST_UNREACH_NOROUTE: 375 code = PRC_UNREACH_NET; 376 break; 377 case ICMP6_DST_UNREACH_ADMIN: 378 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_adminprohib); 379 code = PRC_UNREACH_PROTOCOL; /* is this a good code? */ 380 break; 381 case ICMP6_DST_UNREACH_ADDR: 382 code = PRC_HOSTDEAD; 383 break; 384 #ifdef COMPAT_RFC1885 385 case ICMP6_DST_UNREACH_NOTNEIGHBOR: 386 code = PRC_UNREACH_SRCFAIL; 387 break; 388 #else 389 case ICMP6_DST_UNREACH_BEYONDSCOPE: 390 /* I mean "source address was incorrect." */ 391 code = PRC_PARAMPROB; 392 break; 393 #endif 394 case ICMP6_DST_UNREACH_NOPORT: 395 code = PRC_UNREACH_PORT; 396 break; 397 default: 398 goto badcode; 399 } 400 goto deliver; 401 break; 402 403 case ICMP6_PACKET_TOO_BIG: 404 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_pkttoobig); 405 if (code != 0) 406 goto badcode; 407 408 code = PRC_MSGSIZE; 409 410 /* 411 * Updating the path MTU will be done after examining 412 * intermediate extension headers. 413 */ 414 goto deliver; 415 break; 416 417 case ICMP6_TIME_EXCEEDED: 418 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_timeexceed); 419 switch (code) { 420 case ICMP6_TIME_EXCEED_TRANSIT: 421 case ICMP6_TIME_EXCEED_REASSEMBLY: 422 code += PRC_TIMXCEED_INTRANS; 423 break; 424 default: 425 goto badcode; 426 } 427 goto deliver; 428 break; 429 430 case ICMP6_PARAM_PROB: 431 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_paramprob); 432 switch (code) { 433 case ICMP6_PARAMPROB_NEXTHEADER: 434 code = PRC_UNREACH_PROTOCOL; 435 break; 436 case ICMP6_PARAMPROB_HEADER: 437 case ICMP6_PARAMPROB_OPTION: 438 code = PRC_PARAMPROB; 439 break; 440 default: 441 goto badcode; 442 } 443 goto deliver; 444 break; 445 446 case ICMP6_ECHO_REQUEST: 447 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echo); 448 if (code != 0) 449 goto badcode; 450 if ((n = m_copy(m, 0, M_COPYALL)) == NULL) { 451 /* Give up remote */ 452 break; 453 } 454 if ((n->m_flags & M_EXT) != 0 455 || n->m_len < off + sizeof(struct icmp6_hdr)) { 456 struct mbuf *n0 = n; 457 const int maxlen = sizeof(*nip6) + sizeof(*nicmp6); 458 459 /* 460 * Prepare an internal mbuf. m_pullup() doesn't 461 * always copy the length we specified. 462 */ 463 if (maxlen >= MCLBYTES) { 464 #ifdef DIAGNOSTIC 465 printf("MCLBYTES too small\n"); 466 #endif 467 /* Give up remote */ 468 m_freem(n0); 469 break; 470 } 471 MGETHDR(n, M_DONTWAIT, n0->m_type); 472 if (n && maxlen >= MHLEN) { 473 MCLGET(n, M_DONTWAIT); 474 if ((n->m_flags & M_EXT) == 0) { 475 m_free(n); 476 n = NULL; 477 } 478 } 479 if (n == NULL) { 480 /* Give up remote */ 481 m_freem(n0); 482 break; 483 } 484 M_COPY_PKTHDR(n, n0); 485 /* 486 * Copy IPv6 and ICMPv6 only. 487 */ 488 nip6 = mtod(n, struct ip6_hdr *); 489 bcopy(ip6, nip6, sizeof(struct ip6_hdr)); 490 nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 491 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); 492 noff = sizeof(struct ip6_hdr); 493 n->m_pkthdr.len = n->m_len = 494 noff + sizeof(struct icmp6_hdr); 495 /* 496 * Adjust mbuf. ip6_plen will be adjusted in 497 * ip6_output(). 498 */ 499 m_adj(n0, off + sizeof(struct icmp6_hdr)); 500 n->m_pkthdr.len += n0->m_pkthdr.len; 501 n->m_next = n0; 502 n0->m_flags &= ~M_PKTHDR; 503 } else { 504 nip6 = mtod(n, struct ip6_hdr *); 505 nicmp6 = (struct icmp6_hdr *)((caddr_t)nip6 + off); 506 noff = off; 507 } 508 nicmp6->icmp6_type = ICMP6_ECHO_REPLY; 509 nicmp6->icmp6_code = 0; 510 if (n) { 511 icmp6stat.icp6s_reflect++; 512 icmp6stat.icp6s_outhist[ICMP6_ECHO_REPLY]++; 513 icmp6_reflect(n, noff); 514 } 515 break; 516 517 case ICMP6_ECHO_REPLY: 518 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echoreply); 519 if (code != 0) 520 goto badcode; 521 break; 522 523 case MLD6_LISTENER_QUERY: 524 case MLD6_LISTENER_REPORT: 525 if (icmp6len < sizeof(struct mld6_hdr)) 526 goto badlen; 527 if (icmp6->icmp6_type == MLD6_LISTENER_QUERY) /* XXX: ugly... */ 528 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldquery); 529 else 530 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldreport); 531 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 532 /* give up local */ 533 mld6_input(m, off); 534 m = NULL; 535 goto freeit; 536 } 537 mld6_input(n, off); 538 /* m stays. */ 539 break; 540 541 case MLD6_LISTENER_DONE: 542 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mlddone); 543 if (icmp6len < sizeof(struct mld6_hdr)) /* necessary? */ 544 goto badlen; 545 break; /* nothing to be done in kernel */ 546 547 case MLD6_MTRACE_RESP: 548 case MLD6_MTRACE: 549 /* XXX: these two are experimental. not officially defind. */ 550 /* XXX: per-interface statistics? */ 551 break; /* just pass it to applications */ 552 553 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */ 554 { 555 enum { WRU, FQDN } mode; 556 557 if (!icmp6_nodeinfo) 558 break; 559 560 if (icmp6len == sizeof(struct icmp6_hdr) + 4) 561 mode = WRU; 562 else if (icmp6len >= sizeof(struct icmp6_nodeinfo)) 563 mode = FQDN; 564 else 565 goto badlen; 566 567 if (mode == FQDN) { 568 #ifndef PULLDOWN_TEST 569 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo), 570 IPPROTO_DONE); 571 #endif 572 n = m_copy(m, 0, M_COPYALL); 573 if (n) 574 n = ni6_input(n, off); 575 /* XXX meaningless if n == NULL */ 576 noff = sizeof(struct ip6_hdr); 577 } else { 578 u_char *p; 579 int maxlen, maxhlen; 580 581 if (code != 0) 582 goto badcode; 583 maxlen = sizeof(*nip6) + sizeof(*nicmp6) + 4; 584 if (maxlen >= MCLBYTES) { 585 #ifdef DIAGNOSTIC 586 printf("MCLBYTES too small\n"); 587 #endif 588 /* Give up remote */ 589 break; 590 } 591 MGETHDR(n, M_DONTWAIT, m->m_type); 592 if (n && maxlen > MHLEN) { 593 MCLGET(n, M_DONTWAIT); 594 if ((n->m_flags & M_EXT) == 0) { 595 m_free(n); 596 n = NULL; 597 } 598 } 599 if (n == NULL) { 600 /* Give up remote */ 601 break; 602 } 603 n->m_len = 0; 604 maxhlen = M_TRAILINGSPACE(n) - maxlen; 605 if (maxhlen > hostnamelen) 606 maxhlen = hostnamelen; 607 /* 608 * Copy IPv6 and ICMPv6 only. 609 */ 610 nip6 = mtod(n, struct ip6_hdr *); 611 bcopy(ip6, nip6, sizeof(struct ip6_hdr)); 612 nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 613 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); 614 p = (u_char *)(nicmp6 + 1); 615 bzero(p, 4); 616 bcopy(hostname, p + 4, maxhlen); /*meaningless TTL*/ 617 noff = sizeof(struct ip6_hdr); 618 M_COPY_PKTHDR(n, m); /* just for recvif */ 619 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 620 sizeof(struct icmp6_hdr) + 4 + maxhlen; 621 nicmp6->icmp6_type = ICMP6_WRUREPLY; 622 nicmp6->icmp6_code = 0; 623 } 624 #undef hostnamelen 625 if (n) { 626 icmp6stat.icp6s_reflect++; 627 icmp6stat.icp6s_outhist[ICMP6_WRUREPLY]++; 628 icmp6_reflect(n, noff); 629 } 630 break; 631 } 632 633 case ICMP6_WRUREPLY: 634 if (code != 0) 635 goto badcode; 636 break; 637 638 case ND_ROUTER_SOLICIT: 639 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routersolicit); 640 if (code != 0) 641 goto badcode; 642 if (icmp6len < sizeof(struct nd_router_solicit)) 643 goto badlen; 644 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 645 /* give up local */ 646 nd6_rs_input(m, off, icmp6len); 647 m = NULL; 648 goto freeit; 649 } 650 nd6_rs_input(n, off, icmp6len); 651 /* m stays. */ 652 break; 653 654 case ND_ROUTER_ADVERT: 655 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routeradvert); 656 if (code != 0) 657 goto badcode; 658 if (icmp6len < sizeof(struct nd_router_advert)) 659 goto badlen; 660 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 661 /* give up local */ 662 nd6_ra_input(m, off, icmp6len); 663 m = NULL; 664 goto freeit; 665 } 666 nd6_ra_input(n, off, icmp6len); 667 /* m stays. */ 668 break; 669 670 case ND_NEIGHBOR_SOLICIT: 671 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighborsolicit); 672 if (code != 0) 673 goto badcode; 674 if (icmp6len < sizeof(struct nd_neighbor_solicit)) 675 goto badlen; 676 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 677 /* give up local */ 678 nd6_ns_input(m, off, icmp6len); 679 m = NULL; 680 goto freeit; 681 } 682 nd6_ns_input(n, off, icmp6len); 683 /* m stays. */ 684 break; 685 686 case ND_NEIGHBOR_ADVERT: 687 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighboradvert); 688 if (code != 0) 689 goto badcode; 690 if (icmp6len < sizeof(struct nd_neighbor_advert)) 691 goto badlen; 692 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 693 /* give up local */ 694 nd6_na_input(m, off, icmp6len); 695 m = NULL; 696 goto freeit; 697 } 698 nd6_na_input(n, off, icmp6len); 699 /* m stays. */ 700 break; 701 702 case ND_REDIRECT: 703 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_redirect); 704 if (code != 0) 705 goto badcode; 706 if (icmp6len < sizeof(struct nd_redirect)) 707 goto badlen; 708 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 709 /* give up local */ 710 icmp6_redirect_input(m, off); 711 m = NULL; 712 goto freeit; 713 } 714 icmp6_redirect_input(n, off); 715 /* m stays. */ 716 break; 717 718 case ICMP6_ROUTER_RENUMBERING: 719 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND && 720 code != ICMP6_ROUTER_RENUMBERING_RESULT) 721 goto badcode; 722 if (icmp6len < sizeof(struct icmp6_router_renum)) 723 goto badlen; 724 break; 725 726 default: 727 printf("icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n", 728 icmp6->icmp6_type, ip6_sprintf(&ip6->ip6_src), 729 ip6_sprintf(&ip6->ip6_dst), 730 m->m_pkthdr.rcvif ? m->m_pkthdr.rcvif->if_index : 0); 731 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) { 732 /* ICMPv6 error: MUST deliver it by spec... */ 733 code = PRC_NCMDS; 734 /* deliver */ 735 } else { 736 /* ICMPv6 informational: MUST not deliver */ 737 break; 738 } 739 deliver: 740 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) { 741 icmp6stat.icp6s_tooshort++; 742 goto freeit; 743 } 744 #ifndef PULLDOWN_TEST 745 IP6_EXTHDR_CHECK(m, off, 746 sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr), 747 IPPROTO_DONE); 748 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 749 #else 750 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 751 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 752 if (icmp6 == NULL) { 753 icmp6stat.icp6s_tooshort++; 754 return IPPROTO_DONE; 755 } 756 #endif 757 bzero(&icmp6src, sizeof(icmp6src)); 758 icmp6src.sin6_len = sizeof(struct sockaddr_in6); 759 icmp6src.sin6_family = AF_INET6; 760 icmp6src.sin6_addr = ((struct ip6_hdr *)(icmp6 + 1))->ip6_dst; 761 762 /* Detect the upper level protocol */ 763 { 764 void (*ctlfunc) __P((int, struct sockaddr *, void *)); 765 struct ip6_hdr *eip6 = (struct ip6_hdr *)(icmp6 + 1); 766 u_int8_t nxt = eip6->ip6_nxt; 767 int eoff = off + sizeof(struct icmp6_hdr) + 768 sizeof(struct ip6_hdr); 769 struct ip6ctlparam ip6cp; 770 struct in6_addr *finaldst = NULL; 771 int icmp6type = icmp6->icmp6_type; 772 struct ip6_frag *fh; 773 struct ip6_rthdr *rth; 774 struct ip6_rthdr0 *rth0; 775 int rthlen; 776 777 while (1) { /* XXX: should avoid inf. loop explicitly? */ 778 struct ip6_ext *eh; 779 780 switch(nxt) { 781 case IPPROTO_HOPOPTS: 782 case IPPROTO_DSTOPTS: 783 case IPPROTO_AH: 784 #ifndef PULLDOWN_TEST 785 IP6_EXTHDR_CHECK(m, 0, eoff + 786 sizeof(struct ip6_ext), 787 IPPROTO_DONE); 788 eh = (struct ip6_ext *)(mtod(m, caddr_t) 789 + eoff); 790 #else 791 IP6_EXTHDR_GET(eh, struct ip6_ext *, m, 792 eoff, sizeof(*eh)); 793 if (eh == NULL) { 794 icmp6stat.icp6s_tooshort++; 795 return IPPROTO_DONE; 796 } 797 #endif 798 799 if (nxt == IPPROTO_AH) 800 eoff += (eh->ip6e_len + 2) << 2; 801 else 802 eoff += (eh->ip6e_len + 1) << 3; 803 nxt = eh->ip6e_nxt; 804 break; 805 case IPPROTO_ROUTING: 806 /* 807 * When the erroneous packet contains a 808 * routing header, we should examine the 809 * header to determine the final destination. 810 * Otherwise, we can't properly update 811 * information that depends on the final 812 * destination (e.g. path MTU). 813 */ 814 #ifndef PULLDOWN_TEST 815 IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(*rth), 816 IPPROTO_DONE); 817 rth = (struct ip6_rthdr *)(mtod(m, caddr_t) 818 + eoff); 819 #else 820 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m, 821 eoff, sizeof(*rth)); 822 if (rth == NULL) { 823 icmp6stat.icp6s_tooshort++; 824 return IPPROTO_DONE; 825 } 826 #endif 827 rthlen = (rth->ip6r_len + 1) << 3; 828 /* 829 * XXX: currently there is no 830 * officially defined type other 831 * than type-0. 832 * Note that if the segment left field 833 * is 0, all intermediate hops must 834 * have been passed. 835 */ 836 if (rth->ip6r_segleft && 837 rth->ip6r_type == IPV6_RTHDR_TYPE_0) { 838 int hops; 839 840 #ifndef PULLDOWN_TEST 841 IP6_EXTHDR_CHECK(m, 0, eoff + rthlen, 842 IPPROTO_DONE); 843 rth0 = (struct ip6_rthdr0 *)(mtod(m, caddr_t) + eoff); 844 #else 845 IP6_EXTHDR_GET(rth0, 846 struct ip6_rthdr0 *, m, 847 eoff, rthlen); 848 if (rth0 == NULL) { 849 icmp6stat.icp6s_tooshort++; 850 return IPPROTO_DONE; 851 } 852 #endif 853 /* just ignore a bogus header */ 854 if ((rth0->ip6r0_len % 2) == 0 && 855 (hops = rth0->ip6r0_len/2)) 856 finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1); 857 } 858 eoff += rthlen; 859 nxt = rth->ip6r_nxt; 860 break; 861 case IPPROTO_FRAGMENT: 862 #ifndef PULLDOWN_TEST 863 IP6_EXTHDR_CHECK(m, 0, eoff + 864 sizeof(struct ip6_frag), 865 IPPROTO_DONE); 866 fh = (struct ip6_frag *)(mtod(m, caddr_t) 867 + eoff); 868 #else 869 IP6_EXTHDR_GET(fh, struct ip6_frag *, m, 870 eoff, sizeof(*fh)); 871 if (fh == NULL) { 872 icmp6stat.icp6s_tooshort++; 873 return IPPROTO_DONE; 874 } 875 #endif 876 /* 877 * Data after a fragment header is meaningless 878 * unless it is the first fragment, but 879 * we'll go to the notify label for path MTU 880 * discovery. 881 */ 882 if (fh->ip6f_offlg & IP6F_OFF_MASK) 883 goto notify; 884 885 eoff += sizeof(struct ip6_frag); 886 nxt = fh->ip6f_nxt; 887 break; 888 default: 889 /* 890 * This case includes ESP and the No Next 891 * Header. In such cases going to the notify 892 * label does not have any meaning 893 * (i.e. ctlfunc will be NULL), but we go 894 * anyway since we might have to update 895 * path MTU information. 896 */ 897 goto notify; 898 } 899 } 900 notify: 901 #ifndef PULLDOWN_TEST 902 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); 903 #else 904 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 905 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 906 if (icmp6 == NULL) { 907 icmp6stat.icp6s_tooshort++; 908 return IPPROTO_DONE; 909 } 910 #endif 911 if (icmp6type == ICMP6_PACKET_TOO_BIG) { 912 if (finaldst == NULL) 913 finaldst = &((struct ip6_hdr *)(icmp6 + 1))->ip6_dst; 914 icmp6_mtudisc_update(finaldst, icmp6, m); 915 } 916 917 ctlfunc = (void (*) __P((int, struct sockaddr *, void *))) 918 (inet6sw[ip6_protox[nxt]].pr_ctlinput); 919 if (ctlfunc) { 920 ip6cp.ip6c_m = m; 921 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1); 922 ip6cp.ip6c_off = eoff; 923 (*ctlfunc)(code, (struct sockaddr *)&icmp6src, &ip6cp); 924 } 925 } 926 break; 927 928 badcode: 929 icmp6stat.icp6s_badcode++; 930 break; 931 932 badlen: 933 icmp6stat.icp6s_badlen++; 934 break; 935 } 936 937 icmp6_rip6_input(&m, *offp); 938 return IPPROTO_DONE; 939 940 freeit: 941 m_freem(m); 942 return IPPROTO_DONE; 943 } 944 945 static void 946 icmp6_mtudisc_update(dst, icmp6, m) 947 struct in6_addr *dst; 948 struct icmp6_hdr *icmp6;/* we can assume the validity of the pointer */ 949 struct mbuf *m; /* currently unused but added for scoped addrs */ 950 { 951 u_int mtu = ntohl(icmp6->icmp6_mtu); 952 struct rtentry *rt = NULL; 953 struct sockaddr_in6 sin6; 954 955 bzero(&sin6, sizeof(sin6)); 956 sin6.sin6_family = PF_INET6; 957 sin6.sin6_len = sizeof(struct sockaddr_in6); 958 sin6.sin6_addr = *dst; 959 /* sin6.sin6_scope_id = XXX: should be set if DST is a scoped addr */ 960 rt = rtalloc1((struct sockaddr *)&sin6, 1); /*clone*/ 961 if (!rt || (rt->rt_flags & RTF_HOST) == 0) { 962 if (rt) 963 RTFREE(rt); 964 rt = icmp6_mtudisc_clone((struct sockaddr *)&sin6); 965 } 966 967 if (rt && (rt->rt_flags & RTF_HOST) 968 && !(rt->rt_rmx.rmx_locks & RTV_MTU)) { 969 if (mtu < IPV6_MMTU) { 970 /* xxx */ 971 rt->rt_rmx.rmx_locks |= RTV_MTU; 972 } else if (mtu < rt->rt_ifp->if_mtu && 973 rt->rt_rmx.rmx_mtu > mtu) { 974 rt->rt_rmx.rmx_mtu = mtu; 975 } 976 } 977 if (rt) 978 RTFREE(rt); 979 } 980 981 /* 982 * Process a Node Information Query packet, (roughly) based on 983 * draft-ietf-ipngwg-icmp-name-lookups-05. 984 * 985 * Spec incompatibilities: 986 * - IPv6 Subject address handling 987 * - IPv4 Subject address handling support missing 988 * - Proxy reply (answer even if it's not for me) 989 * - "Supported Qtypes" support missing 990 * - joins NI group address at in6_ifattach() time only, does not cope 991 * with hostname changes by sethostname(3) 992 */ 993 #ifndef offsetof /* XXX */ 994 #define offsetof(type, member) ((size_t)(&((type *)0)->member)) 995 #endif 996 static struct mbuf * 997 ni6_input(m, off) 998 struct mbuf *m; 999 int off; 1000 { 1001 struct icmp6_nodeinfo *ni6, *nni6; 1002 struct mbuf *n = NULL; 1003 u_int16_t qtype; 1004 int subjlen; 1005 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo); 1006 struct ni_reply_fqdn *fqdn; 1007 int addrs; /* for NI_QTYPE_NODEADDR */ 1008 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */ 1009 struct sockaddr_in6 sin6; 1010 struct ip6_hdr *ip6; 1011 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */ 1012 char *subj; 1013 1014 ip6 = mtod(m, struct ip6_hdr *); 1015 #ifndef PULLDOWN_TEST 1016 ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off); 1017 #else 1018 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6)); 1019 if (ni6 == NULL) { 1020 /* m is already reclaimed */ 1021 return NULL; 1022 } 1023 #endif 1024 1025 /* 1026 * Validate IPv6 destination address. 1027 * 1028 * We accept packets with the following IPv6 destination address: 1029 * - Responder's unicast/anycast address, 1030 * - link-local multicast address 1031 * This is a violation to last paragraph in icmp-name-lookups-05 1032 * page 4, which restricts IPv6 destination address of a query to: 1033 * - Responder's unicast/anycast address, 1034 * - NI group address for a name belongs to the Responder, or 1035 * - NI group address for a name for which the Responder is providing 1036 * proxy service. 1037 * (note: NI group address is a link-local multicast address) 1038 * 1039 * We allow any link-local multicast address, since "ping6 -w ff02::1" 1040 * has been really useful for us debugging our network. Also this is 1041 * still questionable if the restriction in spec buy us security at all, 1042 * since RFC2463 permits echo packet to multicast destination. 1043 * Even if we forbid NI query to ff02::1, we can effectively get the 1044 * same result as "ping6 -w ff02::1" by the following steps: 1045 * - run "ping6 ff02::1", then 1046 * - run "ping6 -w" for all addresses replied. 1047 */ 1048 bzero(&sin6, sizeof(sin6)); 1049 sin6.sin6_family = AF_INET6; 1050 sin6.sin6_len = sizeof(struct sockaddr_in6); 1051 bcopy(&ip6->ip6_dst, &sin6.sin6_addr, sizeof(sin6.sin6_addr)); 1052 /* XXX scopeid */ 1053 if (ifa_ifwithaddr((struct sockaddr *)&sin6)) 1054 ; /*unicast/anycast, fine*/ 1055 else if (IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr)) 1056 ; /*violates spec slightly, see above*/ 1057 else 1058 goto bad; 1059 1060 /* guess reply length */ 1061 qtype = ntohs(ni6->ni_qtype); 1062 switch (qtype) { 1063 case NI_QTYPE_NOOP: 1064 break; /* no reply data */ 1065 case NI_QTYPE_SUPTYPES: 1066 goto bad; /* xxx: to be implemented */ 1067 break; 1068 case NI_QTYPE_FQDN: 1069 /* XXX will append a mbuf */ 1070 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1071 break; 1072 case NI_QTYPE_NODEADDR: 1073 addrs = ni6_addrs(ni6, m, &ifp); 1074 if ((replylen += addrs * sizeof(struct in6_addr)) > MCLBYTES) 1075 replylen = MCLBYTES; /* XXX: we'll truncate later */ 1076 break; 1077 default: 1078 /* 1079 * XXX: We must return a reply with the ICMP6 code 1080 * `unknown Qtype' in this case. However we regard the case 1081 * as an FQDN query for backward compatibility. 1082 * Older versions set a random value to this field, 1083 * so it rarely varies in the defined qtypes. 1084 * But the mechanism is not reliable... 1085 * maybe we should obsolete older versions. 1086 */ 1087 qtype = NI_QTYPE_FQDN; 1088 /* XXX will append a mbuf */ 1089 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen); 1090 oldfqdn++; 1091 break; 1092 } 1093 1094 /* validate query Subject field. */ 1095 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo); 1096 switch (qtype) { 1097 case NI_QTYPE_NOOP: 1098 case NI_QTYPE_SUPTYPES: 1099 if (subjlen != 0) 1100 goto bad; 1101 break; 1102 1103 case NI_QTYPE_FQDN: 1104 case NI_QTYPE_NODEADDR: 1105 switch (ni6->ni_code) { 1106 case ICMP6_NI_SUBJ_IPV6: 1107 #if ICMP6_NI_SUBJ_IPV6 != 0 1108 case 0: 1109 #endif 1110 /* 1111 * backward compatibility - try to accept 03 draft 1112 * format, where no Subject is present. 1113 */ 1114 if (subjlen == 0) { 1115 oldfqdn++; 1116 break; 1117 } 1118 1119 if (subjlen != sizeof(sin6.sin6_addr)) 1120 goto bad; 1121 1122 /* 1123 * Validate Subject address. 1124 * 1125 * Not sure what exactly does "address belongs to the 1126 * node" mean in the spec, is it just unicast, or what? 1127 * 1128 * At this moment we consider Subject address as 1129 * "belong to the node" if the Subject address equals 1130 * to the IPv6 destination address; validation for 1131 * IPv6 destination address should have done enough 1132 * check for us. 1133 * 1134 * We do not do proxy at this moment. 1135 */ 1136 /* m_pulldown instead of copy? */ 1137 m_copydata(m, off + sizeof(struct icmp6_nodeinfo), 1138 subjlen, (caddr_t)&sin6.sin6_addr); 1139 /* XXX kame scope hack */ 1140 if (IN6_IS_SCOPE_LINKLOCAL(&sin6.sin6_addr)) { 1141 #ifdef FAKE_LOOPBACK_IF 1142 if ((m->m_flags & M_PKTHDR) != 0 && 1143 m->m_pkthdr.rcvif) { 1144 sin6.sin6_addr.s6_addr16[1] = 1145 htons(m->m_pkthdr.rcvif->if_index); 1146 } 1147 #else 1148 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 1149 sin6.sin6_addr.s6_addr16[1] = 1150 ip6->ip6_dst.s6_addr16[1]; 1151 } 1152 #endif 1153 } 1154 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &sin6.sin6_addr)) 1155 break; 1156 /* 1157 * XXX if we are to allow other cases, we should really 1158 * be careful about scope here. 1159 * basically, we should disallow queries toward IPv6 1160 * destination X with subject Y, if scope(X) > scope(Y). 1161 * if we allow scope(X) > scope(Y), it will result in 1162 * information leakage across scope boundary. 1163 */ 1164 goto bad; 1165 1166 case ICMP6_NI_SUBJ_FQDN: 1167 /* 1168 * Validate Subject name with gethostname(3). 1169 * 1170 * The behavior may need some debate, since: 1171 * - we are not sure if the node has FQDN as 1172 * hostname (returned by gethostname(3)). 1173 * - the code does wildcard match for truncated names. 1174 * however, we are not sure if we want to perform 1175 * wildcard match, if gethostname(3) side has 1176 * truncated hostname. 1177 */ 1178 n = ni6_nametodns(hostname, hostnamelen, 0); 1179 if (!n || n->m_next || n->m_len == 0) 1180 goto bad; 1181 IP6_EXTHDR_GET(subj, char *, m, 1182 off + sizeof(struct icmp6_nodeinfo), subjlen); 1183 if (subj == NULL) 1184 goto bad; 1185 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *), 1186 n->m_len)) { 1187 goto bad; 1188 } 1189 m_freem(n); 1190 n = NULL; 1191 break; 1192 1193 case ICMP6_NI_SUBJ_IPV4: /* xxx: to be implemented? */ 1194 default: 1195 goto bad; 1196 } 1197 break; 1198 1199 default: 1200 /* should never be here due to "switch (qtype)" above */ 1201 goto bad; 1202 } 1203 1204 /* allocate a mbuf to reply. */ 1205 MGETHDR(n, M_DONTWAIT, m->m_type); 1206 if (n == NULL) { 1207 m_freem(m); 1208 return(NULL); 1209 } 1210 M_COPY_PKTHDR(n, m); /* just for recvif */ 1211 if (replylen > MHLEN) { 1212 if (replylen > MCLBYTES) { 1213 /* 1214 * XXX: should we try to allocate more? But MCLBYTES is 1215 * probably much larger than IPV6_MMTU... 1216 */ 1217 goto bad; 1218 } 1219 MCLGET(n, M_DONTWAIT); 1220 if ((n->m_flags & M_EXT) == 0) { 1221 goto bad; 1222 } 1223 } 1224 n->m_pkthdr.len = n->m_len = replylen; 1225 1226 /* copy mbuf header and IPv6 + Node Information base headers */ 1227 bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr)); 1228 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1); 1229 bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo)); 1230 1231 /* qtype dependent procedure */ 1232 switch (qtype) { 1233 case NI_QTYPE_NOOP: 1234 nni6->ni_flags = 0; 1235 break; 1236 case NI_QTYPE_SUPTYPES: 1237 goto bad; /* xxx: to be implemented */ 1238 break; 1239 case NI_QTYPE_FQDN: 1240 fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) + 1241 sizeof(struct ip6_hdr) + 1242 sizeof(struct icmp6_nodeinfo)); 1243 nni6->ni_flags = 0; /* XXX: meaningless TTL */ 1244 fqdn->ni_fqdn_ttl = 0; /* ditto. */ 1245 /* 1246 * XXX do we really have FQDN in variable "hostname"? 1247 */ 1248 n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn); 1249 if (n->m_next == NULL) 1250 goto bad; 1251 /* XXX we assume that n->m_next is not a chain */ 1252 if (n->m_next->m_next != NULL) 1253 goto bad; 1254 n->m_pkthdr.len += n->m_next->m_len; 1255 break; 1256 case NI_QTYPE_NODEADDR: 1257 { 1258 int lenlim, copied; 1259 1260 if (n->m_flags & M_EXT) 1261 lenlim = MCLBYTES - sizeof(struct ip6_hdr) - 1262 sizeof(struct icmp6_nodeinfo); 1263 else 1264 lenlim = MHLEN - sizeof(struct ip6_hdr) - 1265 sizeof(struct icmp6_nodeinfo); 1266 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim); 1267 /* XXX: reset mbuf length */ 1268 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) + 1269 sizeof(struct icmp6_nodeinfo) + copied; 1270 break; 1271 } 1272 default: 1273 break; /* XXX impossible! */ 1274 } 1275 1276 nni6->ni_type = ICMP6_NI_REPLY; 1277 nni6->ni_code = ICMP6_NI_SUCESS; 1278 m_freem(m); 1279 return(n); 1280 1281 bad: 1282 m_freem(m); 1283 if (n) 1284 m_freem(n); 1285 return(NULL); 1286 } 1287 #undef hostnamelen 1288 1289 /* 1290 * make a mbuf with DNS-encoded string. no compression support. 1291 * 1292 * XXX names with less than 2 dots (like "foo" or "foo.section") will be 1293 * treated as truncated name (two \0 at the end). this is a wild guess. 1294 */ 1295 static struct mbuf * 1296 ni6_nametodns(name, namelen, old) 1297 const char *name; 1298 int namelen; 1299 int old; /* return pascal string if non-zero */ 1300 { 1301 struct mbuf *m; 1302 char *cp, *ep; 1303 const char *p, *q; 1304 int i, len, nterm; 1305 1306 if (old) 1307 len = namelen + 1; 1308 else 1309 len = MCLBYTES; 1310 1311 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */ 1312 MGET(m, M_DONTWAIT, MT_DATA); 1313 if (m && len > MLEN) { 1314 MCLGET(m, M_DONTWAIT); 1315 if ((m->m_flags & M_EXT) == 0) 1316 goto fail; 1317 } 1318 if (!m) 1319 goto fail; 1320 m->m_next = NULL; 1321 1322 if (old) { 1323 m->m_len = len; 1324 *mtod(m, char *) = namelen; 1325 bcopy(name, mtod(m, char *) + 1, namelen); 1326 return m; 1327 } else { 1328 m->m_len = 0; 1329 cp = mtod(m, char *); 1330 ep = mtod(m, char *) + M_TRAILINGSPACE(m); 1331 1332 /* if not certain about my name, return empty buffer */ 1333 if (namelen == 0) 1334 return m; 1335 1336 /* 1337 * guess if it looks like shortened hostname, or FQDN. 1338 * shortened hostname needs two trailing "\0". 1339 */ 1340 i = 0; 1341 for (p = name; p < name + namelen; p++) { 1342 if (*p && *p == '.') 1343 i++; 1344 } 1345 if (i < 2) 1346 nterm = 2; 1347 else 1348 nterm = 1; 1349 1350 p = name; 1351 while (cp < ep && p < name + namelen) { 1352 i = 0; 1353 for (q = p; q < name + namelen && *q && *q != '.'; q++) 1354 i++; 1355 /* result does not fit into mbuf */ 1356 if (cp + i + 1 >= ep) 1357 goto fail; 1358 /* DNS label length restriction, RFC1035 page 8 */ 1359 if (i >= 64) 1360 goto fail; 1361 *cp++ = i; 1362 bcopy(p, cp, i); 1363 cp += i; 1364 p = q; 1365 if (p < name + namelen && *p == '.') 1366 p++; 1367 } 1368 /* termination */ 1369 if (cp + nterm >= ep) 1370 goto fail; 1371 while (nterm-- > 0) 1372 *cp++ = '\0'; 1373 m->m_len = cp - mtod(m, char *); 1374 return m; 1375 } 1376 1377 panic("should not reach here"); 1378 /*NOTREACHED*/ 1379 1380 fail: 1381 if (m) 1382 m_freem(m); 1383 return NULL; 1384 } 1385 1386 /* 1387 * check if two DNS-encoded string matches. takes care of truncated 1388 * form (with \0\0 at the end). no compression support. 1389 */ 1390 static int 1391 ni6_dnsmatch(a, alen, b, blen) 1392 const char *a; 1393 int alen; 1394 const char *b; 1395 int blen; 1396 { 1397 const char *a0, *b0; 1398 int l; 1399 1400 /* simplest case - need validation? */ 1401 if (alen == blen && bcmp(a, b, alen) == 0) 1402 return 1; 1403 1404 a0 = a; 1405 b0 = b; 1406 1407 /* termination is mandatory */ 1408 if (alen < 2 || blen < 2) 1409 return 0; 1410 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0') 1411 return 0; 1412 alen--; 1413 blen--; 1414 1415 while (a - a0 < alen && b - b0 < blen) { 1416 if (a - a0 + 1 > alen || b - b0 + 1 > blen) 1417 return 0; 1418 1419 if ((signed char)a[0] < 0 || (signed char)b[0] < 0) 1420 return 0; 1421 /* we don't support compression yet */ 1422 if (a[0] >= 64 || b[0] >= 64) 1423 return 0; 1424 1425 /* truncated case */ 1426 if (a[0] == 0 && a - a0 == alen - 1) 1427 return 1; 1428 if (b[0] == 0 && b - b0 == blen - 1) 1429 return 1; 1430 if (a[0] == 0 || b[0] == 0) 1431 return 0; 1432 1433 if (a[0] != b[0]) 1434 return 0; 1435 l = a[0]; 1436 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen) 1437 return 0; 1438 if (bcmp(a + 1, b + 1, l) != 0) 1439 return 0; 1440 1441 a += 1 + l; 1442 b += 1 + l; 1443 } 1444 1445 if (a - a0 == alen && b - b0 == blen) 1446 return 1; 1447 else 1448 return 0; 1449 } 1450 1451 /* 1452 * calculate the number of addresses to be returned in the node info reply. 1453 */ 1454 static int 1455 ni6_addrs(ni6, m, ifpp) 1456 struct icmp6_nodeinfo *ni6; 1457 struct mbuf *m; 1458 struct ifnet **ifpp; 1459 { 1460 register struct ifnet *ifp; 1461 register struct in6_ifaddr *ifa6; 1462 register struct ifaddr *ifa; 1463 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1464 int addrs = 0, addrsofif, iffound = 0; 1465 1466 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) 1467 { 1468 addrsofif = 0; 1469 for (ifa = ifp->if_addrlist.tqh_first; ifa; 1470 ifa = ifa->ifa_list.tqe_next) 1471 { 1472 if (ifa->ifa_addr->sa_family != AF_INET6) 1473 continue; 1474 ifa6 = (struct in6_ifaddr *)ifa; 1475 1476 if (!(ni6->ni_flags & NI_NODEADDR_FLAG_ALL) && 1477 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 1478 &ifa6->ia_addr.sin6_addr)) 1479 iffound = 1; 1480 1481 /* 1482 * IPv4-mapped addresses can only be returned by a 1483 * Node Information proxy, since they represent 1484 * addresses of IPv4-only nodes, which perforce do 1485 * not implement this protocol. 1486 * [icmp-name-lookups-05] 1487 * So we don't support NI_NODEADDR_FLAG_COMPAT in 1488 * this function at this moment. 1489 */ 1490 1491 if (ifa6->ia6_flags & IN6_IFF_ANYCAST) 1492 continue; /* we need only unicast addresses */ 1493 1494 if ((ni6->ni_flags & (NI_NODEADDR_FLAG_LINKLOCAL | 1495 NI_NODEADDR_FLAG_SITELOCAL | 1496 NI_NODEADDR_FLAG_GLOBAL)) == 0) 1497 continue; 1498 1499 /* What do we have to do about ::1? */ 1500 switch(in6_addrscope(&ifa6->ia_addr.sin6_addr)) { 1501 case IPV6_ADDR_SCOPE_LINKLOCAL: 1502 if (ni6->ni_flags & NI_NODEADDR_FLAG_LINKLOCAL) 1503 addrsofif++; 1504 break; 1505 case IPV6_ADDR_SCOPE_SITELOCAL: 1506 if (ni6->ni_flags & NI_NODEADDR_FLAG_SITELOCAL) 1507 addrsofif++; 1508 break; 1509 case IPV6_ADDR_SCOPE_GLOBAL: 1510 if (ni6->ni_flags & NI_NODEADDR_FLAG_GLOBAL) 1511 addrsofif++; 1512 break; 1513 default: 1514 continue; 1515 } 1516 } 1517 if (iffound) { 1518 *ifpp = ifp; 1519 return(addrsofif); 1520 } 1521 1522 addrs += addrsofif; 1523 } 1524 1525 return(addrs); 1526 } 1527 1528 static int 1529 ni6_store_addrs(ni6, nni6, ifp0, resid) 1530 struct icmp6_nodeinfo *ni6, *nni6; 1531 struct ifnet *ifp0; 1532 int resid; 1533 { 1534 register struct ifnet *ifp = ifp0 ? ifp0 : TAILQ_FIRST(&ifnet); 1535 register struct in6_ifaddr *ifa6; 1536 register struct ifaddr *ifa; 1537 int docopy, copied = 0; 1538 u_char *cp = (u_char *)(nni6 + 1); 1539 1540 if (ifp0 == NULL && !(ni6->ni_flags & NI_NODEADDR_FLAG_ALL)) 1541 return(0); /* needless to copy */ 1542 1543 for (; ifp; ifp = TAILQ_NEXT(ifp, if_list)) 1544 { 1545 for (ifa = ifp->if_addrlist.tqh_first; ifa; 1546 ifa = ifa->ifa_list.tqe_next) 1547 { 1548 docopy = 0; 1549 1550 if (ifa->ifa_addr->sa_family != AF_INET6) 1551 continue; 1552 ifa6 = (struct in6_ifaddr *)ifa; 1553 1554 if (ifa6->ia6_flags & IN6_IFF_ANYCAST) { 1555 /* just experimental. not in the spec. */ 1556 if (ni6->ni_flags & NI_NODEADDR_FLAG_ANYCAST) 1557 docopy = 1; 1558 else 1559 continue; 1560 } 1561 else { /* unicast address */ 1562 if (ni6->ni_flags & NI_NODEADDR_FLAG_ANYCAST) 1563 continue; 1564 else 1565 docopy = 1; 1566 } 1567 1568 /* What do we have to do about ::1? */ 1569 switch(in6_addrscope(&ifa6->ia_addr.sin6_addr)) { 1570 case IPV6_ADDR_SCOPE_LINKLOCAL: 1571 if (ni6->ni_flags & NI_NODEADDR_FLAG_LINKLOCAL) 1572 docopy = 1; 1573 break; 1574 case IPV6_ADDR_SCOPE_SITELOCAL: 1575 if (ni6->ni_flags & NI_NODEADDR_FLAG_SITELOCAL) 1576 docopy = 1; 1577 break; 1578 case IPV6_ADDR_SCOPE_GLOBAL: 1579 if (ni6->ni_flags & NI_NODEADDR_FLAG_GLOBAL) 1580 docopy = 1; 1581 break; 1582 default: 1583 continue; 1584 } 1585 1586 if (docopy) { 1587 if (resid < sizeof(struct in6_addr)) { 1588 /* 1589 * We give up much more copy. 1590 * Set the truncate flag and return. 1591 */ 1592 nni6->ni_flags |= 1593 NI_NODEADDR_FLAG_TRUNCATE; 1594 return(copied); 1595 } 1596 bcopy(&ifa6->ia_addr.sin6_addr, cp, 1597 sizeof(struct in6_addr)); 1598 /* XXX: KAME link-local hack; remove ifindex */ 1599 if (IN6_IS_ADDR_LINKLOCAL(&ifa6->ia_addr.sin6_addr)) 1600 ((struct in6_addr *)cp)->s6_addr16[1] = 0; 1601 cp += sizeof(struct in6_addr); 1602 resid -= sizeof(struct in6_addr); 1603 copied += sizeof(struct in6_addr); 1604 } 1605 } 1606 if (ifp0) /* we need search only on the specified IF */ 1607 break; 1608 } 1609 1610 return(copied); 1611 } 1612 1613 /* 1614 * XXX almost dup'ed code with rip6_input. 1615 */ 1616 static int 1617 icmp6_rip6_input(mp, off) 1618 struct mbuf **mp; 1619 int off; 1620 { 1621 struct mbuf *m = *mp; 1622 register struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1623 register struct in6pcb *in6p; 1624 struct in6pcb *last = NULL; 1625 struct sockaddr_in6 rip6src; 1626 struct icmp6_hdr *icmp6; 1627 struct mbuf *opts = NULL; 1628 1629 #ifndef PULLDOWN_TEST 1630 /* this is assumed to be safe. */ 1631 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off); 1632 #else 1633 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 1634 if (icmp6 == NULL) { 1635 /* m is already reclaimed */ 1636 return IPPROTO_DONE; 1637 } 1638 #endif 1639 1640 bzero(&rip6src, sizeof(rip6src)); 1641 rip6src.sin6_len = sizeof(struct sockaddr_in6); 1642 rip6src.sin6_family = AF_INET6; 1643 rip6src.sin6_addr = ip6->ip6_src; 1644 if (IN6_IS_SCOPE_LINKLOCAL(&rip6src.sin6_addr)) 1645 rip6src.sin6_addr.s6_addr16[1] = 0; 1646 if (m->m_pkthdr.rcvif) { 1647 if (IN6_IS_SCOPE_LINKLOCAL(&rip6src.sin6_addr)) 1648 rip6src.sin6_scope_id = m->m_pkthdr.rcvif->if_index; 1649 else 1650 rip6src.sin6_scope_id = 0; 1651 } else 1652 rip6src.sin6_scope_id = 0; 1653 1654 for (in6p = rawin6pcb.in6p_next; 1655 in6p != &rawin6pcb; in6p = in6p->in6p_next) 1656 { 1657 if (in6p->in6p_ip6_nxt != IPPROTO_ICMPV6) 1658 continue; 1659 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && 1660 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst)) 1661 continue; 1662 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) && 1663 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src)) 1664 continue; 1665 if (in6p->in6p_icmp6filt 1666 && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type, 1667 in6p->in6p_icmp6filt)) 1668 continue; 1669 if (last) { 1670 struct mbuf *n; 1671 if ((n = m_copy(m, 0, (int)M_COPYALL)) != NULL) { 1672 if (last->in6p_flags & IN6P_CONTROLOPTS) 1673 ip6_savecontrol(last, &opts, ip6, n); 1674 /* strip intermediate headers */ 1675 m_adj(n, off); 1676 if (sbappendaddr(&last->in6p_socket->so_rcv, 1677 (struct sockaddr *)&rip6src, 1678 n, opts) == 0) { 1679 /* should notify about lost packet */ 1680 m_freem(n); 1681 if (opts) 1682 m_freem(opts); 1683 } else 1684 sorwakeup(last->in6p_socket); 1685 opts = NULL; 1686 } 1687 } 1688 last = in6p; 1689 } 1690 if (last) { 1691 if (last->in6p_flags & IN6P_CONTROLOPTS) 1692 ip6_savecontrol(last, &opts, ip6, m); 1693 /* strip intermediate headers */ 1694 m_adj(m, off); 1695 if (sbappendaddr(&last->in6p_socket->so_rcv, 1696 (struct sockaddr *)&rip6src, m, opts) == 0) { 1697 m_freem(m); 1698 if (opts) 1699 m_freem(opts); 1700 } else 1701 sorwakeup(last->in6p_socket); 1702 } else { 1703 m_freem(m); 1704 ip6stat.ip6s_delivered--; 1705 } 1706 return IPPROTO_DONE; 1707 } 1708 1709 /* 1710 * Reflect the ip6 packet back to the source. 1711 * OFF points to the icmp6 header, counted from the top of the mbuf. 1712 */ 1713 void 1714 icmp6_reflect(m, off) 1715 struct mbuf *m; 1716 size_t off; 1717 { 1718 struct ip6_hdr *ip6; 1719 struct icmp6_hdr *icmp6; 1720 struct in6_ifaddr *ia; 1721 struct in6_addr t, *src = 0; 1722 int plen; 1723 int type, code; 1724 struct ifnet *outif = NULL; 1725 #ifdef COMPAT_RFC1885 1726 int mtu = IPV6_MMTU; 1727 struct sockaddr_in6 *sin6 = &icmp6_reflect_rt.ro_dst; 1728 #endif 1729 1730 /* too short to reflect */ 1731 if (off < sizeof(struct ip6_hdr)) { 1732 printf("sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n", 1733 (u_long)off, (u_long)sizeof(struct ip6_hdr), 1734 __FILE__, __LINE__); 1735 goto bad; 1736 } 1737 1738 /* 1739 * If there are extra headers between IPv6 and ICMPv6, strip 1740 * off that header first. 1741 */ 1742 if (off > sizeof(struct ip6_hdr)) { 1743 size_t l; 1744 struct ip6_hdr nip6; 1745 1746 l = off - sizeof(struct ip6_hdr); 1747 m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6); 1748 m_adj(m, l); 1749 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 1750 if (m->m_len < l) { 1751 if ((m = m_pullup(m, l)) == NULL) 1752 return; 1753 } 1754 bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6)); 1755 } else /* off == sizeof(struct ip6_hdr) */ { 1756 size_t l; 1757 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 1758 if (m->m_len < l) { 1759 if ((m = m_pullup(m, l)) == NULL) 1760 return; 1761 } 1762 } 1763 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr); 1764 ip6 = mtod(m, struct ip6_hdr *); 1765 ip6->ip6_nxt = IPPROTO_ICMPV6; 1766 icmp6 = (struct icmp6_hdr *)(ip6 + 1); 1767 type = icmp6->icmp6_type; /* keep type for statistics */ 1768 code = icmp6->icmp6_code; /* ditto. */ 1769 1770 t = ip6->ip6_dst; 1771 /* 1772 * ip6_input() drops a packet if its src is multicast. 1773 * So, the src is never multicast. 1774 */ 1775 ip6->ip6_dst = ip6->ip6_src; 1776 1777 /* XXX hack for link-local addresses */ 1778 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) 1779 ip6->ip6_dst.s6_addr16[1] = 1780 htons(m->m_pkthdr.rcvif->if_index); 1781 if (IN6_IS_ADDR_LINKLOCAL(&t)) 1782 t.s6_addr16[1] = htons(m->m_pkthdr.rcvif->if_index); 1783 1784 #ifdef COMPAT_RFC1885 1785 /* 1786 * xxx guess MTU 1787 * RFC 1885 requires that echo reply should be truncated if it 1788 * does not fit in with (return) path MTU, but the description was 1789 * removed in the new spec. 1790 */ 1791 if (icmp6_reflect_rt.ro_rt == 0 || 1792 ! (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &ip6->ip6_dst))) { 1793 if (icmp6_reflect_rt.ro_rt) { 1794 icmp6_reflect_rt.ro_rt = 0; 1795 } 1796 bzero(sin6, sizeof(*sin6)); 1797 sin6->sin6_family = PF_INET6; 1798 sin6->sin6_len = sizeof(struct sockaddr_in6); 1799 sin6->sin6_addr = ip6->ip6_dst; 1800 1801 rtalloc((struct route *)&icmp6_reflect_rt.ro_rt); 1802 } 1803 1804 if (icmp6_reflect_rt.ro_rt == 0) 1805 goto bad; 1806 1807 if ((icmp6_reflect_rt.ro_rt->rt_flags & RTF_HOST) 1808 && mtu < icmp6_reflect_rt.ro_rt->rt_ifp->if_mtu) 1809 mtu = icmp6_reflect_rt.ro_rt->rt_rmx.rmx_mtu; 1810 1811 if (mtu < m->m_pkthdr.len) { 1812 plen -= (m->m_pkthdr.len - mtu); 1813 m_adj(m, mtu - m->m_pkthdr.len); 1814 } 1815 #endif 1816 /* 1817 * If the incoming packet was addressed directly to us(i.e. unicast), 1818 * use dst as the src for the reply. 1819 * The IN6_IFF_NOTREADY case would be VERY rare, but is possible 1820 * (for example) when we encounter an error while forwarding procedure 1821 * destined to a duplicated address of ours. 1822 */ 1823 for (ia = in6_ifaddr; ia; ia = ia->ia_next) 1824 if (IN6_ARE_ADDR_EQUAL(&t, &ia->ia_addr.sin6_addr) && 1825 (ia->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)) == 0) { 1826 src = &t; 1827 break; 1828 } 1829 if (ia == NULL && IN6_IS_ADDR_LINKLOCAL(&t) && (m->m_flags & M_LOOP)) { 1830 /* 1831 * This is the case if the dst is our link-local address 1832 * and the sender is also ourseleves. 1833 */ 1834 src = &t; 1835 } 1836 1837 if (src == 0) 1838 /* 1839 * This case matches to multicasts, our anycast, or unicasts 1840 * that we do not own. Select a source address which has the 1841 * same scope. 1842 * XXX: for (non link-local) multicast addresses, this might 1843 * not be a good choice. 1844 */ 1845 if ((ia = in6_ifawithscope(m->m_pkthdr.rcvif, &t)) != 0) 1846 src = &IA6_SIN6(ia)->sin6_addr; 1847 1848 if (src == 0) 1849 goto bad; 1850 1851 ip6->ip6_src = *src; 1852 1853 ip6->ip6_flow = 0; 1854 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 1855 ip6->ip6_vfc |= IPV6_VERSION; 1856 ip6->ip6_nxt = IPPROTO_ICMPV6; 1857 if (m->m_pkthdr.rcvif) { 1858 /* XXX: This may not be the outgoing interface */ 1859 ip6->ip6_hlim = nd_ifinfo[m->m_pkthdr.rcvif->if_index].chlim; 1860 } 1861 1862 icmp6->icmp6_cksum = 0; 1863 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6, 1864 sizeof(struct ip6_hdr), plen); 1865 1866 /* 1867 * xxx option handling 1868 */ 1869 1870 m->m_flags &= ~(M_BCAST|M_MCAST); 1871 #ifdef IPSEC 1872 /* Don't lookup socket */ 1873 ipsec_setsocket(m, NULL); 1874 #endif /*IPSEC*/ 1875 1876 #ifdef COMPAT_RFC1885 1877 ip6_output(m, NULL, &icmp6_reflect_rt, 0, NULL, &outif); 1878 #else 1879 ip6_output(m, NULL, NULL, 0, NULL, &outif); 1880 #endif 1881 if (outif) 1882 icmp6_ifoutstat_inc(outif, type, code); 1883 1884 return; 1885 1886 bad: 1887 m_freem(m); 1888 return; 1889 } 1890 1891 void 1892 icmp6_fasttimo() 1893 { 1894 1895 mld6_fasttimeo(); 1896 } 1897 1898 static const char * 1899 icmp6_redirect_diag(src6, dst6, tgt6) 1900 struct in6_addr *src6; 1901 struct in6_addr *dst6; 1902 struct in6_addr *tgt6; 1903 { 1904 static char buf[1024]; 1905 snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)", 1906 ip6_sprintf(src6), ip6_sprintf(dst6), ip6_sprintf(tgt6)); 1907 return buf; 1908 } 1909 1910 void 1911 icmp6_redirect_input(m, off) 1912 register struct mbuf *m; 1913 int off; 1914 { 1915 struct ifnet *ifp = m->m_pkthdr.rcvif; 1916 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1917 struct nd_redirect *nd_rd; 1918 int icmp6len = ntohs(ip6->ip6_plen); 1919 char *lladdr = NULL; 1920 int lladdrlen = 0; 1921 u_char *redirhdr = NULL; 1922 int redirhdrlen = 0; 1923 struct rtentry *rt = NULL; 1924 int is_router; 1925 int is_onlink; 1926 struct in6_addr src6 = ip6->ip6_src; 1927 struct in6_addr redtgt6; 1928 struct in6_addr reddst6; 1929 union nd_opts ndopts; 1930 1931 if (!m || !ifp) 1932 return; 1933 1934 /* XXX if we are router, we don't update route by icmp6 redirect */ 1935 if (ip6_forwarding) 1936 goto freeit; 1937 if (!icmp6_rediraccept) 1938 goto freeit; 1939 1940 #ifndef PULLDOWN_TEST 1941 IP6_EXTHDR_CHECK(m, off, icmp6len,); 1942 nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off); 1943 #else 1944 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len); 1945 if (nd_rd == NULL) { 1946 icmp6stat.icp6s_tooshort++; 1947 return; 1948 } 1949 #endif 1950 redtgt6 = nd_rd->nd_rd_target; 1951 reddst6 = nd_rd->nd_rd_dst; 1952 1953 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 1954 redtgt6.s6_addr16[1] = htons(ifp->if_index); 1955 if (IN6_IS_ADDR_LINKLOCAL(&reddst6)) 1956 reddst6.s6_addr16[1] = htons(ifp->if_index); 1957 1958 /* validation */ 1959 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) { 1960 log(LOG_ERR, 1961 "ICMP6 redirect sent from %s rejected; " 1962 "must be from linklocal\n", ip6_sprintf(&src6)); 1963 goto freeit; 1964 } 1965 if (ip6->ip6_hlim != 255) { 1966 log(LOG_ERR, 1967 "ICMP6 redirect sent from %s rejected; " 1968 "hlim=%d (must be 255)\n", 1969 ip6_sprintf(&src6), ip6->ip6_hlim); 1970 goto freeit; 1971 } 1972 { 1973 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */ 1974 struct sockaddr_in6 sin6; 1975 struct in6_addr *gw6; 1976 1977 bzero(&sin6, sizeof(sin6)); 1978 sin6.sin6_family = AF_INET6; 1979 sin6.sin6_len = sizeof(struct sockaddr_in6); 1980 bcopy(&reddst6, &sin6.sin6_addr, sizeof(reddst6)); 1981 rt = rtalloc1((struct sockaddr *)&sin6, 0); 1982 if (rt) { 1983 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr); 1984 if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) { 1985 log(LOG_ERR, 1986 "ICMP6 redirect rejected; " 1987 "not equal to gw-for-src=%s (must be same): " 1988 "%s\n", 1989 ip6_sprintf(gw6), 1990 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); 1991 RTFREE(rt); 1992 goto freeit; 1993 } 1994 } else { 1995 log(LOG_ERR, 1996 "ICMP6 redirect rejected; " 1997 "no route found for redirect dst: %s\n", 1998 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); 1999 goto freeit; 2000 } 2001 RTFREE(rt); 2002 rt = NULL; 2003 } 2004 if (IN6_IS_ADDR_MULTICAST(&reddst6)) { 2005 log(LOG_ERR, 2006 "ICMP6 redirect rejected; " 2007 "redirect dst must be unicast: %s\n", 2008 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); 2009 goto freeit; 2010 } 2011 2012 is_router = is_onlink = 0; 2013 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 2014 is_router = 1; /* router case */ 2015 if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0) 2016 is_onlink = 1; /* on-link destination case */ 2017 if (!is_router && !is_onlink) { 2018 log(LOG_ERR, 2019 "ICMP6 redirect rejected; " 2020 "neither router case nor onlink case: %s\n", 2021 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); 2022 goto freeit; 2023 } 2024 /* validation passed */ 2025 2026 icmp6len -= sizeof(*nd_rd); 2027 nd6_option_init(nd_rd + 1, icmp6len, &ndopts); 2028 if (nd6_options(&ndopts) < 0) { 2029 log(LOG_INFO, "icmp6_redirect_input: " 2030 "invalid ND option, rejected: %s\n", 2031 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); 2032 goto freeit; 2033 } 2034 2035 if (ndopts.nd_opts_tgt_lladdr) { 2036 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 2037 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 2038 } 2039 2040 if (ndopts.nd_opts_rh) { 2041 redirhdrlen = ndopts.nd_opts_rh->nd_opt_rh_len; 2042 redirhdr = (u_char *)(ndopts.nd_opts_rh + 1); /* xxx */ 2043 } 2044 2045 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 2046 log(LOG_INFO, 2047 "icmp6_redirect_input: lladdrlen mismatch for %s " 2048 "(if %d, icmp6 packet %d): %s\n", 2049 ip6_sprintf(&redtgt6), ifp->if_addrlen, lladdrlen - 2, 2050 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)); 2051 } 2052 2053 /* RFC 2461 8.3 */ 2054 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT, 2055 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER); 2056 2057 if (!is_onlink) { /* better router case. perform rtredirect. */ 2058 /* perform rtredirect */ 2059 struct sockaddr_in6 sdst; 2060 struct sockaddr_in6 sgw; 2061 struct sockaddr_in6 ssrc; 2062 2063 bzero(&sdst, sizeof(sdst)); 2064 bzero(&sgw, sizeof(sgw)); 2065 bzero(&ssrc, sizeof(ssrc)); 2066 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6; 2067 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len = 2068 sizeof(struct sockaddr_in6); 2069 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr)); 2070 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2071 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr)); 2072 rtredirect((struct sockaddr *)&sdst, (struct sockaddr *)&sgw, 2073 (struct sockaddr *)NULL, RTF_GATEWAY | RTF_HOST, 2074 (struct sockaddr *)&ssrc, 2075 (struct rtentry **)NULL 2076 ); 2077 } 2078 /* finally update cached route in each socket via pfctlinput */ 2079 { 2080 struct sockaddr_in6 sdst; 2081 #if 1 2082 #else 2083 struct ip6protosw *pr; 2084 #endif 2085 2086 bzero(&sdst, sizeof(sdst)); 2087 sdst.sin6_family = AF_INET6; 2088 sdst.sin6_len = sizeof(struct sockaddr_in6); 2089 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr)); 2090 #if 1 2091 pfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst); 2092 #else 2093 /* 2094 * do not use pfctlinput() here, we have different prototype for 2095 * xx_ctlinput() in ip6proto. 2096 */ 2097 for (pr = (struct ip6protosw *)inet6domain.dom_protosw; 2098 pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; 2099 pr++) { 2100 if (pr->pr_ctlinput) { 2101 (*pr->pr_ctlinput)(PRC_REDIRECT_HOST, 2102 (struct sockaddr *)&sdst, NULL, NULL, 0); 2103 } 2104 } 2105 #endif 2106 #ifdef IPSEC 2107 key_sa_routechange((struct sockaddr *)&sdst); 2108 #endif 2109 } 2110 2111 freeit: 2112 m_freem(m); 2113 } 2114 2115 void 2116 icmp6_redirect_output(m0, rt) 2117 struct mbuf *m0; 2118 struct rtentry *rt; 2119 { 2120 struct ifnet *ifp; /* my outgoing interface */ 2121 struct in6_addr *ifp_ll6; 2122 struct in6_addr *router_ll6; 2123 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */ 2124 struct mbuf *m = NULL; /* newly allocated one */ 2125 struct ip6_hdr *ip6; /* m as struct ip6_hdr */ 2126 struct nd_redirect *nd_rd; 2127 size_t maxlen; 2128 u_char *p; 2129 struct ifnet *outif = NULL; 2130 struct sockaddr_in6 src_sa; 2131 2132 /* if we are not router, we don't send icmp6 redirect */ 2133 if (!ip6_forwarding || ip6_accept_rtadv) 2134 goto fail; 2135 2136 /* sanity check */ 2137 if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp)) 2138 goto fail; 2139 2140 /* 2141 * Address check: 2142 * the source address must identify a neighbor, and 2143 * the destination address must not be a multicast address 2144 * [RFC 2461, sec 8.2] 2145 */ 2146 sip6 = mtod(m0, struct ip6_hdr *); 2147 bzero(&src_sa, sizeof(src_sa)); 2148 src_sa.sin6_family = AF_INET6; 2149 src_sa.sin6_len = sizeof(src_sa); 2150 src_sa.sin6_addr = sip6->ip6_src; 2151 /* we don't currently use sin6_scope_id, but eventually use it */ 2152 src_sa.sin6_scope_id = in6_addr2scopeid(ifp, &sip6->ip6_src); 2153 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0) 2154 goto fail; 2155 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst)) 2156 goto fail; /* what should we do here? */ 2157 2158 /* rate limit */ 2159 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0)) 2160 goto fail; 2161 2162 /* 2163 * Since we are going to append up to 1280 bytes (= IPV6_MMTU), 2164 * we almost always ask for an mbuf cluster for simplicity. 2165 * (MHLEN < IPV6_MMTU is almost always true) 2166 */ 2167 #if IPV6_MMTU >= MCLBYTES 2168 # error assumption failed about IPV6_MMTU and MCLBYTES 2169 #endif 2170 MGETHDR(m, M_DONTWAIT, MT_HEADER); 2171 if (m && IPV6_MMTU >= MHLEN) 2172 MCLGET(m, M_DONTWAIT); 2173 if (!m) 2174 goto fail; 2175 maxlen = (m->m_flags & M_EXT) ? MCLBYTES : MHLEN; 2176 maxlen = min(IPV6_MMTU, maxlen); 2177 /* just for safety */ 2178 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) + 2179 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) { 2180 goto fail; 2181 } 2182 2183 { 2184 /* get ip6 linklocal address for ifp(my outgoing interface). */ 2185 struct in6_ifaddr *ia; 2186 if ((ia = in6ifa_ifpforlinklocal(ifp, 2187 IN6_IFF_NOTREADY| 2188 IN6_IFF_ANYCAST)) == NULL) 2189 goto fail; 2190 ifp_ll6 = &ia->ia_addr.sin6_addr; 2191 } 2192 2193 /* get ip6 linklocal address for the router. */ 2194 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) { 2195 struct sockaddr_in6 *sin6; 2196 sin6 = (struct sockaddr_in6 *)rt->rt_gateway; 2197 router_ll6 = &sin6->sin6_addr; 2198 if (!IN6_IS_ADDR_LINKLOCAL(router_ll6)) 2199 router_ll6 = (struct in6_addr *)NULL; 2200 } else 2201 router_ll6 = (struct in6_addr *)NULL; 2202 2203 /* ip6 */ 2204 ip6 = mtod(m, struct ip6_hdr *); 2205 ip6->ip6_flow = 0; 2206 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 2207 ip6->ip6_vfc |= IPV6_VERSION; 2208 /* ip6->ip6_plen will be set later */ 2209 ip6->ip6_nxt = IPPROTO_ICMPV6; 2210 ip6->ip6_hlim = 255; 2211 /* ip6->ip6_src must be linklocal addr for my outgoing if. */ 2212 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr)); 2213 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr)); 2214 2215 /* ND Redirect */ 2216 nd_rd = (struct nd_redirect *)(ip6 + 1); 2217 nd_rd->nd_rd_type = ND_REDIRECT; 2218 nd_rd->nd_rd_code = 0; 2219 nd_rd->nd_rd_reserved = 0; 2220 if (rt->rt_flags & RTF_GATEWAY) { 2221 /* 2222 * nd_rd->nd_rd_target must be a link-local address in 2223 * better router cases. 2224 */ 2225 if (!router_ll6) 2226 goto fail; 2227 bcopy(router_ll6, &nd_rd->nd_rd_target, 2228 sizeof(nd_rd->nd_rd_target)); 2229 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2230 sizeof(nd_rd->nd_rd_dst)); 2231 } else { 2232 /* make sure redtgt == reddst */ 2233 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target, 2234 sizeof(nd_rd->nd_rd_target)); 2235 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 2236 sizeof(nd_rd->nd_rd_dst)); 2237 } 2238 2239 p = (u_char *)(nd_rd + 1); 2240 2241 if (!router_ll6) 2242 goto nolladdropt; 2243 2244 { 2245 /* target lladdr option */ 2246 struct rtentry *rt_router = NULL; 2247 int len; 2248 struct sockaddr_dl *sdl; 2249 struct nd_opt_hdr *nd_opt; 2250 char *lladdr; 2251 2252 rt_router = nd6_lookup(router_ll6, 0, ifp); 2253 if (!rt_router) 2254 goto nolladdropt; 2255 len = sizeof(*nd_opt) + ifp->if_addrlen; 2256 len = (len + 7) & ~7; /*round by 8*/ 2257 /* safety check */ 2258 if (len + (p - (u_char *)ip6) > maxlen) 2259 goto nolladdropt; 2260 if (!(rt_router->rt_flags & RTF_GATEWAY) && 2261 (rt_router->rt_flags & RTF_LLINFO) && 2262 (rt_router->rt_gateway->sa_family == AF_LINK) && 2263 (sdl = (struct sockaddr_dl *)rt_router->rt_gateway) && 2264 sdl->sdl_alen) { 2265 nd_opt = (struct nd_opt_hdr *)p; 2266 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 2267 nd_opt->nd_opt_len = len >> 3; 2268 lladdr = (char *)(nd_opt + 1); 2269 bcopy(LLADDR(sdl), lladdr, ifp->if_addrlen); 2270 p += len; 2271 } 2272 } 2273 nolladdropt:; 2274 2275 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2276 2277 /* just to be safe */ 2278 if (m0->m_flags & M_DECRYPTED) 2279 goto noredhdropt; 2280 if (p - (u_char *)ip6 > maxlen) 2281 goto noredhdropt; 2282 2283 { 2284 /* redirected header option */ 2285 int len; 2286 struct nd_opt_rd_hdr *nd_opt_rh; 2287 2288 /* 2289 * compute the maximum size for icmp6 redirect header option. 2290 * XXX room for auth header? 2291 */ 2292 len = maxlen - (p - (u_char *)ip6); 2293 len &= ~7; 2294 2295 /* This is just for simplicity. */ 2296 if (m0->m_pkthdr.len != m0->m_len) { 2297 if (m0->m_next) { 2298 m_freem(m0->m_next); 2299 m0->m_next = NULL; 2300 } 2301 m0->m_pkthdr.len = m0->m_len; 2302 } 2303 2304 /* 2305 * Redirected header option spec (RFC2461 4.6.3) talks nothing 2306 * about padding/truncate rule for the original IP packet. 2307 * From the discussion on IPv6imp in Feb 1999, the consensus was: 2308 * - "attach as much as possible" is the goal 2309 * - pad if not aligned (original size can be guessed by original 2310 * ip6 header) 2311 * Following code adds the padding if it is simple enough, 2312 * and truncates if not. 2313 */ 2314 if (m0->m_next || m0->m_pkthdr.len != m0->m_len) 2315 panic("assumption failed in %s:%d\n", __FILE__, __LINE__); 2316 2317 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) { 2318 /* not enough room, truncate */ 2319 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh); 2320 } else { 2321 /* enough room, pad or truncate */ 2322 size_t extra; 2323 2324 extra = m0->m_pkthdr.len % 8; 2325 if (extra) { 2326 /* pad if easy enough, truncate if not */ 2327 if (8 - extra <= M_TRAILINGSPACE(m0)) { 2328 /* pad */ 2329 m0->m_len += (8 - extra); 2330 m0->m_pkthdr.len += (8 - extra); 2331 } else { 2332 /* truncate */ 2333 m0->m_pkthdr.len -= extra; 2334 m0->m_len -= extra; 2335 } 2336 } 2337 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh); 2338 m0->m_pkthdr.len = m0->m_len = len - sizeof(*nd_opt_rh); 2339 } 2340 2341 nd_opt_rh = (struct nd_opt_rd_hdr *)p; 2342 bzero(nd_opt_rh, sizeof(*nd_opt_rh)); 2343 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER; 2344 nd_opt_rh->nd_opt_rh_len = len >> 3; 2345 p += sizeof(*nd_opt_rh); 2346 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 2347 2348 /* connect m0 to m */ 2349 m->m_next = m0; 2350 m->m_pkthdr.len = m->m_len + m0->m_len; 2351 } 2352 noredhdropt:; 2353 2354 if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_src)) 2355 sip6->ip6_src.s6_addr16[1] = 0; 2356 if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_dst)) 2357 sip6->ip6_dst.s6_addr16[1] = 0; 2358 #if 0 2359 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src)) 2360 ip6->ip6_src.s6_addr16[1] = 0; 2361 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) 2362 ip6->ip6_dst.s6_addr16[1] = 0; 2363 #endif 2364 if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_target)) 2365 nd_rd->nd_rd_target.s6_addr16[1] = 0; 2366 if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_dst)) 2367 nd_rd->nd_rd_dst.s6_addr16[1] = 0; 2368 2369 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 2370 2371 nd_rd->nd_rd_cksum = 0; 2372 nd_rd->nd_rd_cksum 2373 = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), ntohs(ip6->ip6_plen)); 2374 2375 /* send the packet to outside... */ 2376 #ifdef IPSEC 2377 /* Don't lookup socket */ 2378 ipsec_setsocket(m, NULL); 2379 #endif /*IPSEC*/ 2380 ip6_output(m, NULL, NULL, 0, NULL, &outif); 2381 if (outif) { 2382 icmp6_ifstat_inc(outif, ifs6_out_msg); 2383 icmp6_ifstat_inc(outif, ifs6_out_redirect); 2384 } 2385 icmp6stat.icp6s_outhist[ND_REDIRECT]++; 2386 2387 return; 2388 2389 fail: 2390 if (m) 2391 m_freem(m); 2392 if (m0) 2393 m_freem(m0); 2394 } 2395 2396 /* 2397 * ICMPv6 socket option processing. 2398 */ 2399 int 2400 icmp6_ctloutput(op, so, level, optname, mp) 2401 int op; 2402 struct socket *so; 2403 int level, optname; 2404 struct mbuf **mp; 2405 { 2406 register struct in6pcb *in6p = sotoin6pcb(so); 2407 register struct mbuf *m = *mp; 2408 int error = 0; 2409 2410 if (level != IPPROTO_ICMPV6) { 2411 error = EINVAL; 2412 if (op == PRCO_SETOPT && m) 2413 (void)m_free(m); 2414 } else switch(op) { 2415 case PRCO_SETOPT: 2416 switch (optname) { 2417 case ICMP6_FILTER: 2418 { 2419 struct icmp6_filter *p; 2420 2421 p = mtod(m, struct icmp6_filter *); 2422 if (!p || !in6p->in6p_icmp6filt) { 2423 error = EINVAL; 2424 break; 2425 } 2426 bcopy(p, in6p->in6p_icmp6filt, 2427 sizeof(struct icmp6_filter)); 2428 error = 0; 2429 break; 2430 } 2431 2432 default: 2433 error = ENOPROTOOPT; 2434 break; 2435 } 2436 if (m) 2437 (void)m_free(m); 2438 break; 2439 2440 case PRCO_GETOPT: 2441 switch (optname) { 2442 case ICMP6_FILTER: 2443 { 2444 struct icmp6_filter *p; 2445 2446 if (!in6p->in6p_icmp6filt) { 2447 error = EINVAL; 2448 break; 2449 } 2450 *mp = m = m_get(M_WAIT, MT_SOOPTS); 2451 m->m_len = sizeof(struct icmp6_filter); 2452 p = mtod(m, struct icmp6_filter *); 2453 bcopy(in6p->in6p_icmp6filt, p, 2454 sizeof(struct icmp6_filter)); 2455 error = 0; 2456 break; 2457 } 2458 2459 default: 2460 error = ENOPROTOOPT; 2461 break; 2462 } 2463 break; 2464 } 2465 2466 return(error); 2467 } 2468 2469 /* 2470 * Perform rate limit check. 2471 * Returns 0 if it is okay to send the icmp6 packet. 2472 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate 2473 * limitation. 2474 * 2475 * XXX per-destination/type check necessary? 2476 */ 2477 static int 2478 icmp6_ratelimit(dst, type, code) 2479 const struct in6_addr *dst; /* not used at this moment */ 2480 const int type; /* not used at this moment */ 2481 const int code; /* not used at this moment */ 2482 { 2483 static struct timeval icmp6errratelim_last; 2484 2485 /* 2486 * ratecheck() returns true if it is okay to send. We return 2487 * true if it is not okay to send. 2488 */ 2489 return (ratecheck(&icmp6errratelim_last, &icmp6errratelim) == 0); 2490 } 2491 2492 static struct rtentry * 2493 icmp6_mtudisc_clone(dst) 2494 struct sockaddr *dst; 2495 { 2496 struct rtentry *rt; 2497 int error; 2498 2499 rt = rtalloc1(dst, 1); 2500 if (rt == 0) 2501 return NULL; 2502 2503 /* If we didn't get a host route, allocate one */ 2504 if ((rt->rt_flags & RTF_HOST) == 0) { 2505 struct rtentry *nrt; 2506 2507 error = rtrequest((int) RTM_ADD, dst, 2508 (struct sockaddr *) rt->rt_gateway, 2509 (struct sockaddr *) 0, 2510 RTF_GATEWAY | RTF_HOST | RTF_DYNAMIC, &nrt); 2511 if (error) { 2512 rtfree(rt); 2513 rtfree(nrt); 2514 return NULL; 2515 } 2516 nrt->rt_rmx = rt->rt_rmx; 2517 rtfree(rt); 2518 rt = nrt; 2519 } 2520 error = rt_timer_add(rt, icmp6_mtudisc_timeout, 2521 icmp6_mtudisc_timeout_q); 2522 if (error) { 2523 rtfree(rt); 2524 return NULL; 2525 } 2526 2527 return rt; /* caller need to call rtfree() */ 2528 } 2529 2530 static void 2531 icmp6_mtudisc_timeout(rt, r) 2532 struct rtentry *rt; 2533 struct rttimer *r; 2534 { 2535 if (rt == NULL) 2536 panic("icmp6_mtudisc_timeout: bad route to timeout"); 2537 if ((rt->rt_flags & (RTF_DYNAMIC | RTF_HOST)) == 2538 (RTF_DYNAMIC | RTF_HOST)) { 2539 rtrequest((int) RTM_DELETE, (struct sockaddr *)rt_key(rt), 2540 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0); 2541 } else { 2542 if ((rt->rt_rmx.rmx_locks & RTV_MTU) == 0) { 2543 rt->rt_rmx.rmx_mtu = 0; 2544 } 2545 } 2546 } 2547 2548 #include <uvm/uvm_extern.h> 2549 #include <sys/sysctl.h> 2550 2551 int 2552 icmp6_sysctl(name, namelen, oldp, oldlenp, newp, newlen) 2553 int *name; 2554 u_int namelen; 2555 void *oldp; 2556 size_t *oldlenp; 2557 void *newp; 2558 size_t newlen; 2559 { 2560 2561 /* All sysctl names at this level are terminal. */ 2562 if (namelen != 1) 2563 return ENOTDIR; 2564 2565 switch (name[0]) { 2566 2567 case ICMPV6CTL_REDIRACCEPT: 2568 return sysctl_int(oldp, oldlenp, newp, newlen, 2569 &icmp6_rediraccept); 2570 case ICMPV6CTL_REDIRTIMEOUT: 2571 return sysctl_int(oldp, oldlenp, newp, newlen, 2572 &icmp6_redirtimeout); 2573 case ICMPV6CTL_STATS: 2574 return sysctl_rdstruct(oldp, oldlenp, newp, 2575 &icmp6stat, sizeof(icmp6stat)); 2576 case ICMPV6CTL_ERRRATELIMIT: 2577 { 2578 int rate_usec, error, s; 2579 2580 /* 2581 * The sysctl specifies the rate in usec-between-icmp, 2582 * so we must convert from/to a timeval. 2583 */ 2584 rate_usec = (icmp6errratelim.tv_sec * 1000000) + 2585 icmp6errratelim.tv_usec; 2586 error = sysctl_int(oldp, oldlenp, newp, newlen, &rate_usec); 2587 if (error) 2588 return (error); 2589 if (rate_usec < 0) 2590 return (EINVAL); 2591 s = splsoftnet(); 2592 icmp6errratelim.tv_sec = rate_usec / 1000000; 2593 icmp6errratelim.tv_usec = rate_usec % 1000000; 2594 splx(s); 2595 2596 return (0); 2597 } 2598 case ICMPV6CTL_ND6_PRUNE: 2599 return sysctl_int(oldp, oldlenp, newp, newlen, &nd6_prune); 2600 case ICMPV6CTL_ND6_DELAY: 2601 return sysctl_int(oldp, oldlenp, newp, newlen, &nd6_delay); 2602 case ICMPV6CTL_ND6_UMAXTRIES: 2603 return sysctl_int(oldp, oldlenp, newp, newlen, &nd6_umaxtries); 2604 case ICMPV6CTL_ND6_MMAXTRIES: 2605 return sysctl_int(oldp, oldlenp, newp, newlen, &nd6_mmaxtries); 2606 case ICMPV6CTL_ND6_USELOOPBACK: 2607 return sysctl_int(oldp, oldlenp, newp, newlen, 2608 &nd6_useloopback); 2609 case ICMPV6CTL_NODEINFO: 2610 return sysctl_int(oldp, oldlenp, newp, newlen, &icmp6_nodeinfo); 2611 default: 2612 return ENOPROTOOPT; 2613 } 2614 /* NOTREACHED */ 2615 } 2616
Indexes created Fri Sep 26 20:09:58 GMT 2025