1 /* $OpenBSD: icmp6.c,v 1.248 2023/04/05 21:51:47 bluhm Exp $ */ 2 /* $KAME: icmp6.c,v 1.217 2001/06/20 15:03:29 jinmei Exp $ */ 3 4 /* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* 34 * Copyright (c) 1982, 1986, 1988, 1993 35 * The Regents of the University of California. All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. Neither the name of the University nor the names of its contributors 46 * may be used to endorse or promote products derived from this software 47 * without specific prior written permission. 48 * 49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 59 * SUCH DAMAGE. 60 * 61 * @(#)ip_icmp.c 8.2 (Berkeley) 1/4/94 62 */ 63 64 #include "carp.h" 65 #include "pf.h" 66 67 #include <sys/param.h> 68 #include <sys/systm.h> 69 #include <sys/malloc.h> 70 #include <sys/mbuf.h> 71 #include <sys/sysctl.h> 72 #include <sys/protosw.h> 73 #include <sys/socket.h> 74 #include <sys/socketvar.h> 75 #include <sys/time.h> 76 #include <sys/kernel.h> 77 #include <sys/syslog.h> 78 79 #include <net/if.h> 80 #include <net/if_var.h> 81 #include <net/route.h> 82 #include <net/if_dl.h> 83 #include <net/if_types.h> 84 85 #include <netinet/in.h> 86 #include <netinet/ip.h> 87 #include <netinet6/in6_var.h> 88 #include <netinet/ip6.h> 89 #include <netinet6/ip6_var.h> 90 #include <netinet/icmp6.h> 91 #include <netinet6/mld6_var.h> 92 #include <netinet/in_pcb.h> 93 #include <netinet6/nd6.h> 94 #include <netinet6/ip6protosw.h> 95 96 #if NCARP > 0 97 #include <netinet/ip_carp.h> 98 #endif 99 100 #if NPF > 0 101 #include <net/pfvar.h> 102 #endif 103 104 struct cpumem *icmp6counters; 105 106 extern int icmp6errppslim; 107 static int icmp6errpps_count = 0; 108 static struct timeval icmp6errppslim_last; 109 110 /* 111 * List of callbacks to notify when Path MTU changes are made. 112 */ 113 struct icmp6_mtudisc_callback { 114 LIST_ENTRY(icmp6_mtudisc_callback) mc_list; 115 void (*mc_func)(struct sockaddr_in6 *, u_int); 116 }; 117 118 LIST_HEAD(, icmp6_mtudisc_callback) icmp6_mtudisc_callbacks = 119 LIST_HEAD_INITIALIZER(icmp6_mtudisc_callbacks); 120 121 struct rttimer_queue icmp6_mtudisc_timeout_q; 122 123 /* XXX do these values make any sense? */ 124 static int icmp6_mtudisc_hiwat = 1280; 125 static int icmp6_mtudisc_lowat = 256; 126 127 /* 128 * keep track of # of redirect routes. 129 */ 130 struct rttimer_queue icmp6_redirect_timeout_q; 131 132 void icmp6_errcount(int, int); 133 int icmp6_ratelimit(const struct in6_addr *, const int, const int); 134 const char *icmp6_redirect_diag(struct in6_addr *, struct in6_addr *, 135 struct in6_addr *); 136 int icmp6_notify_error(struct mbuf *, int, int, int); 137 void icmp6_mtudisc_timeout(struct rtentry *, u_int); 138 139 void 140 icmp6_init(void) 141 { 142 mld6_init(); 143 rt_timer_queue_init(&icmp6_mtudisc_timeout_q, ip6_mtudisc_timeout, 144 &icmp6_mtudisc_timeout); 145 rt_timer_queue_init(&icmp6_redirect_timeout_q, icmp6_redirtimeout, 146 NULL); 147 icmp6counters = counters_alloc(icp6s_ncounters); 148 } 149 150 void 151 icmp6_errcount(int type, int code) 152 { 153 enum icmp6stat_counters c = icp6s_ounknown; 154 155 switch (type) { 156 case ICMP6_DST_UNREACH: 157 switch (code) { 158 case ICMP6_DST_UNREACH_NOROUTE: 159 c = icp6s_odst_unreach_noroute; 160 break; 161 case ICMP6_DST_UNREACH_ADMIN: 162 c = icp6s_odst_unreach_admin; 163 break; 164 case ICMP6_DST_UNREACH_BEYONDSCOPE: 165 c = icp6s_odst_unreach_beyondscope; 166 break; 167 case ICMP6_DST_UNREACH_ADDR: 168 c = icp6s_odst_unreach_addr; 169 break; 170 case ICMP6_DST_UNREACH_NOPORT: 171 c = icp6s_odst_unreach_noport; 172 break; 173 } 174 break; 175 case ICMP6_PACKET_TOO_BIG: 176 c = icp6s_opacket_too_big; 177 break; 178 case ICMP6_TIME_EXCEEDED: 179 switch (code) { 180 case ICMP6_TIME_EXCEED_TRANSIT: 181 c = icp6s_otime_exceed_transit; 182 break; 183 case ICMP6_TIME_EXCEED_REASSEMBLY: 184 c = icp6s_otime_exceed_reassembly; 185 break; 186 } 187 break; 188 case ICMP6_PARAM_PROB: 189 switch (code) { 190 case ICMP6_PARAMPROB_HEADER: 191 c = icp6s_oparamprob_header; 192 break; 193 case ICMP6_PARAMPROB_NEXTHEADER: 194 c = icp6s_oparamprob_nextheader; 195 break; 196 case ICMP6_PARAMPROB_OPTION: 197 c = icp6s_oparamprob_option; 198 break; 199 } 200 break; 201 case ND_REDIRECT: 202 c = icp6s_oredirect; 203 break; 204 } 205 206 icmp6stat_inc(c); 207 } 208 209 /* 210 * Register a Path MTU Discovery callback. 211 */ 212 void 213 icmp6_mtudisc_callback_register(void (*func)(struct sockaddr_in6 *, u_int)) 214 { 215 struct icmp6_mtudisc_callback *mc; 216 217 LIST_FOREACH(mc, &icmp6_mtudisc_callbacks, mc_list) { 218 if (mc->mc_func == func) 219 return; 220 } 221 222 mc = malloc(sizeof(*mc), M_PCB, M_NOWAIT); 223 if (mc == NULL) 224 panic("%s", __func__); 225 226 mc->mc_func = func; 227 LIST_INSERT_HEAD(&icmp6_mtudisc_callbacks, mc, mc_list); 228 } 229 230 struct mbuf * 231 icmp6_do_error(struct mbuf *m, int type, int code, int param) 232 { 233 struct ip6_hdr *oip6, *nip6; 234 struct icmp6_hdr *icmp6; 235 u_int preplen; 236 int off; 237 int nxt; 238 239 icmp6stat_inc(icp6s_error); 240 241 /* count per-type-code statistics */ 242 icmp6_errcount(type, code); 243 244 if (m->m_len < sizeof(struct ip6_hdr)) { 245 m = m_pullup(m, sizeof(struct ip6_hdr)); 246 if (m == NULL) 247 return (NULL); 248 } 249 oip6 = mtod(m, struct ip6_hdr *); 250 251 /* 252 * If the destination address of the erroneous packet is a multicast 253 * address, or the packet was sent using link-layer multicast, 254 * we should basically suppress sending an error (RFC 2463, Section 255 * 2.4). 256 * We have two exceptions (the item e.2 in that section): 257 * - the Packet Too Big message can be sent for path MTU discovery. 258 * - the Parameter Problem Message that can be allowed an icmp6 error 259 * in the option type field. This check has been done in 260 * ip6_unknown_opt(), so we can just check the type and code. 261 */ 262 if ((m->m_flags & (M_BCAST|M_MCAST) || 263 IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) && 264 (type != ICMP6_PACKET_TOO_BIG && 265 (type != ICMP6_PARAM_PROB || 266 code != ICMP6_PARAMPROB_OPTION))) 267 goto freeit; 268 269 /* 270 * RFC 2463, 2.4 (e.5): source address check. 271 * XXX: the case of anycast source? 272 */ 273 if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) || 274 IN6_IS_ADDR_MULTICAST(&oip6->ip6_src)) 275 goto freeit; 276 277 /* 278 * If we are about to send ICMPv6 against ICMPv6 error/redirect, 279 * don't do it. 280 */ 281 nxt = -1; 282 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); 283 if (off >= 0 && nxt == IPPROTO_ICMPV6) { 284 struct icmp6_hdr *icp; 285 286 IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off, 287 sizeof(*icp)); 288 if (icp == NULL) { 289 icmp6stat_inc(icp6s_tooshort); 290 return (NULL); 291 } 292 if (icp->icmp6_type < ICMP6_ECHO_REQUEST || 293 icp->icmp6_type == ND_REDIRECT) { 294 /* 295 * ICMPv6 error 296 * Special case: for redirect (which is 297 * informational) we must not send icmp6 error. 298 */ 299 icmp6stat_inc(icp6s_canterror); 300 goto freeit; 301 } else { 302 /* ICMPv6 informational - send the error */ 303 } 304 } 305 else { 306 /* non-ICMPv6 - send the error */ 307 } 308 309 oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */ 310 311 /* Finally, do rate limitation check. */ 312 if (icmp6_ratelimit(&oip6->ip6_src, type, code)) { 313 icmp6stat_inc(icp6s_toofreq); 314 goto freeit; 315 } 316 317 /* 318 * OK, ICMP6 can be generated. 319 */ 320 321 if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN) 322 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len); 323 324 preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 325 M_PREPEND(m, preplen, M_DONTWAIT); 326 if (m && m->m_len < preplen) 327 m = m_pullup(m, preplen); 328 if (m == NULL) { 329 nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__)); 330 return (NULL); 331 } 332 333 nip6 = mtod(m, struct ip6_hdr *); 334 nip6->ip6_src = oip6->ip6_src; 335 nip6->ip6_dst = oip6->ip6_dst; 336 337 if (IN6_IS_SCOPE_EMBED(&oip6->ip6_src)) 338 oip6->ip6_src.s6_addr16[1] = 0; 339 if (IN6_IS_SCOPE_EMBED(&oip6->ip6_dst)) 340 oip6->ip6_dst.s6_addr16[1] = 0; 341 342 icmp6 = (struct icmp6_hdr *)(nip6 + 1); 343 icmp6->icmp6_type = type; 344 icmp6->icmp6_code = code; 345 icmp6->icmp6_pptr = htonl((u_int32_t)param); 346 347 /* 348 * icmp6_reflect() is designed to be in the input path. 349 * icmp6_error() can be called from both input and output path, 350 * and if we are in output path rcvif could contain bogus value. 351 * clear m->m_pkthdr.ph_ifidx for safety, we should have enough 352 * scope information in ip header (nip6). 353 */ 354 m->m_pkthdr.ph_ifidx = 0; 355 356 icmp6stat_inc(icp6s_outhist + type); 357 358 return (m); 359 360 freeit: 361 /* 362 * If we can't tell whether or not we can generate ICMP6, free it. 363 */ 364 return (m_freem(m)); 365 } 366 367 /* 368 * Generate an error packet of type error in response to bad IP6 packet. 369 */ 370 void 371 icmp6_error(struct mbuf *m, int type, int code, int param) 372 { 373 struct mbuf *n; 374 375 n = icmp6_do_error(m, type, code, param); 376 if (n != NULL) { 377 /* header order: IPv6 - ICMPv6 */ 378 if (!icmp6_reflect(&n, sizeof(struct ip6_hdr), NULL)) 379 ip6_send(n); 380 } 381 } 382 383 /* 384 * Process a received ICMP6 message. 385 */ 386 int 387 icmp6_input(struct mbuf **mp, int *offp, int proto, int af) 388 { 389 #if NCARP > 0 390 struct ifnet *ifp; 391 #endif 392 struct mbuf *m = *mp, *n; 393 struct ip6_hdr *ip6, *nip6; 394 struct icmp6_hdr *icmp6, *nicmp6; 395 int off = *offp; 396 int icmp6len = m->m_pkthdr.len - off; 397 int code, sum, noff; 398 char src[INET6_ADDRSTRLEN], dst[INET6_ADDRSTRLEN]; 399 400 /* 401 * Locate icmp6 structure in mbuf, and check 402 * that not corrupted and of at least minimum length 403 */ 404 405 ip6 = mtod(m, struct ip6_hdr *); 406 if (icmp6len < sizeof(struct icmp6_hdr)) { 407 icmp6stat_inc(icp6s_tooshort); 408 goto freeit; 409 } 410 411 /* 412 * calculate the checksum 413 */ 414 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6)); 415 if (icmp6 == NULL) { 416 icmp6stat_inc(icp6s_tooshort); 417 return IPPROTO_DONE; 418 } 419 code = icmp6->icmp6_code; 420 421 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) { 422 nd6log((LOG_ERR, 423 "ICMP6 checksum error(%d|%x) %s\n", 424 icmp6->icmp6_type, sum, 425 inet_ntop(AF_INET6, &ip6->ip6_src, src, sizeof(src)))); 426 icmp6stat_inc(icp6s_checksum); 427 goto freeit; 428 } 429 430 #if NPF > 0 431 if (m->m_pkthdr.pf.flags & PF_TAG_DIVERTED) { 432 switch (icmp6->icmp6_type) { 433 /* 434 * These ICMP6 types map to other connections. They must be 435 * delivered to pr_ctlinput() also for diverted connections. 436 */ 437 case ICMP6_DST_UNREACH: 438 case ICMP6_PACKET_TOO_BIG: 439 case ICMP6_TIME_EXCEEDED: 440 case ICMP6_PARAM_PROB: 441 /* 442 * Do not use the divert-to property of the TCP or UDP 443 * rule when doing the PCB lookup for the raw socket. 444 */ 445 m->m_pkthdr.pf.flags &=~ PF_TAG_DIVERTED; 446 break; 447 default: 448 goto raw; 449 } 450 } 451 #endif /* NPF */ 452 453 #if NCARP > 0 454 ifp = if_get(m->m_pkthdr.ph_ifidx); 455 if (ifp == NULL) 456 goto freeit; 457 458 if (icmp6->icmp6_type == ICMP6_ECHO_REQUEST && 459 carp_lsdrop(ifp, m, AF_INET6, ip6->ip6_src.s6_addr32, 460 ip6->ip6_dst.s6_addr32, 1)) { 461 if_put(ifp); 462 goto freeit; 463 } 464 465 if_put(ifp); 466 #endif 467 icmp6stat_inc(icp6s_inhist + icmp6->icmp6_type); 468 469 switch (icmp6->icmp6_type) { 470 case ICMP6_DST_UNREACH: 471 switch (code) { 472 case ICMP6_DST_UNREACH_NOROUTE: 473 code = PRC_UNREACH_NET; 474 break; 475 case ICMP6_DST_UNREACH_ADMIN: 476 code = PRC_UNREACH_PROTOCOL; /* is this a good code? */ 477 break; 478 case ICMP6_DST_UNREACH_ADDR: 479 code = PRC_HOSTDEAD; 480 break; 481 case ICMP6_DST_UNREACH_BEYONDSCOPE: 482 /* I mean "source address was incorrect." */ 483 code = PRC_PARAMPROB; 484 break; 485 case ICMP6_DST_UNREACH_NOPORT: 486 code = PRC_UNREACH_PORT; 487 break; 488 default: 489 goto badcode; 490 } 491 goto deliver; 492 493 case ICMP6_PACKET_TOO_BIG: 494 /* MTU is checked in icmp6_mtudisc_update. */ 495 code = PRC_MSGSIZE; 496 497 /* 498 * Updating the path MTU will be done after examining 499 * intermediate extension headers. 500 */ 501 goto deliver; 502 503 case ICMP6_TIME_EXCEEDED: 504 switch (code) { 505 case ICMP6_TIME_EXCEED_TRANSIT: 506 code = PRC_TIMXCEED_INTRANS; 507 break; 508 case ICMP6_TIME_EXCEED_REASSEMBLY: 509 code = PRC_TIMXCEED_REASS; 510 break; 511 default: 512 goto badcode; 513 } 514 goto deliver; 515 516 case ICMP6_PARAM_PROB: 517 switch (code) { 518 case ICMP6_PARAMPROB_NEXTHEADER: 519 code = PRC_UNREACH_PROTOCOL; 520 break; 521 case ICMP6_PARAMPROB_HEADER: 522 case ICMP6_PARAMPROB_OPTION: 523 code = PRC_PARAMPROB; 524 break; 525 default: 526 goto badcode; 527 } 528 goto deliver; 529 530 case ICMP6_ECHO_REQUEST: 531 if (code != 0) 532 goto badcode; 533 /* 534 * Copy mbuf to send to two data paths: userland socket(s), 535 * and to the querier (echo reply). 536 * m: a copy for socket, n: a copy for querier 537 */ 538 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 539 /* Give up local */ 540 n = m; 541 m = *mp = NULL; 542 goto deliverecho; 543 } 544 /* 545 * If the first mbuf is shared, or the first mbuf is too short, 546 * copy the first part of the data into a fresh mbuf. 547 * Otherwise, we will wrongly overwrite both copies. 548 */ 549 if ((n->m_flags & M_EXT) != 0 || 550 n->m_len < off + sizeof(struct icmp6_hdr)) { 551 struct mbuf *n0 = n; 552 const int maxlen = sizeof(*nip6) + sizeof(*nicmp6); 553 554 /* 555 * Prepare an internal mbuf. m_pullup() doesn't 556 * always copy the length we specified. 557 */ 558 if (maxlen >= MCLBYTES) { 559 /* Give up remote */ 560 m_freem(n0); 561 break; 562 } 563 MGETHDR(n, M_DONTWAIT, n0->m_type); 564 if (n && maxlen >= MHLEN) { 565 MCLGET(n, M_DONTWAIT); 566 if ((n->m_flags & M_EXT) == 0) { 567 m_free(n); 568 n = NULL; 569 } 570 } 571 if (n == NULL) { 572 /* Give up local */ 573 m_freem(n0); 574 n = m; 575 m = *mp = NULL; 576 goto deliverecho; 577 } 578 M_MOVE_PKTHDR(n, n0); 579 /* 580 * Copy IPv6 and ICMPv6 only. 581 */ 582 nip6 = mtod(n, struct ip6_hdr *); 583 bcopy(ip6, nip6, sizeof(struct ip6_hdr)); 584 nicmp6 = (struct icmp6_hdr *)(nip6 + 1); 585 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr)); 586 noff = sizeof(struct ip6_hdr); 587 n->m_len = noff + sizeof(struct icmp6_hdr); 588 /* 589 * Adjust mbuf. ip6_plen will be adjusted in 590 * ip6_output(). 591 * n->m_pkthdr.len == n0->m_pkthdr.len at this point. 592 */ 593 n->m_pkthdr.len += noff + sizeof(struct icmp6_hdr); 594 n->m_pkthdr.len -= (off + sizeof(struct icmp6_hdr)); 595 m_adj(n0, off + sizeof(struct icmp6_hdr)); 596 n->m_next = n0; 597 } else { 598 deliverecho: 599 IP6_EXTHDR_GET(nicmp6, struct icmp6_hdr *, n, off, 600 sizeof(*nicmp6)); 601 noff = off; 602 } 603 if (n) { 604 nicmp6->icmp6_type = ICMP6_ECHO_REPLY; 605 nicmp6->icmp6_code = 0; 606 icmp6stat_inc(icp6s_reflect); 607 icmp6stat_inc(icp6s_outhist + ICMP6_ECHO_REPLY); 608 if (!icmp6_reflect(&n, noff, NULL)) 609 ip6_send(n); 610 } 611 if (!m) 612 goto freeit; 613 break; 614 615 case ICMP6_ECHO_REPLY: 616 if (code != 0) 617 goto badcode; 618 break; 619 620 case MLD_LISTENER_QUERY: 621 case MLD_LISTENER_REPORT: 622 if (icmp6len < sizeof(struct mld_hdr)) 623 goto badlen; 624 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 625 /* give up local */ 626 mld6_input(m, off); 627 m = NULL; 628 goto freeit; 629 } 630 mld6_input(n, off); 631 /* m stays. */ 632 break; 633 634 case MLD_LISTENER_DONE: 635 if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */ 636 goto badlen; 637 break; /* nothing to be done in kernel */ 638 639 case MLD_MTRACE_RESP: 640 case MLD_MTRACE: 641 /* XXX: these two are experimental. not officially defined. */ 642 /* XXX: per-interface statistics? */ 643 break; /* just pass it to applications */ 644 645 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */ 646 /* IPv6 Node Information Queries are not supported */ 647 break; 648 case ICMP6_WRUREPLY: 649 break; 650 651 case ND_ROUTER_SOLICIT: 652 case ND_ROUTER_ADVERT: 653 if (code != 0) 654 goto badcode; 655 if ((icmp6->icmp6_type == ND_ROUTER_SOLICIT && icmp6len < 656 sizeof(struct nd_router_solicit)) || 657 (icmp6->icmp6_type == ND_ROUTER_ADVERT && icmp6len < 658 sizeof(struct nd_router_advert))) 659 goto badlen; 660 661 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 662 /* give up local */ 663 nd6_rtr_cache(m, off, icmp6len, 664 icmp6->icmp6_type); 665 m = NULL; 666 goto freeit; 667 } 668 nd6_rtr_cache(n, off, icmp6len, icmp6->icmp6_type); 669 /* m stays. */ 670 break; 671 672 case ND_NEIGHBOR_SOLICIT: 673 if (code != 0) 674 goto badcode; 675 if (icmp6len < sizeof(struct nd_neighbor_solicit)) 676 goto badlen; 677 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 678 /* give up local */ 679 nd6_ns_input(m, off, icmp6len); 680 m = NULL; 681 goto freeit; 682 } 683 nd6_ns_input(n, off, icmp6len); 684 /* m stays. */ 685 break; 686 687 case ND_NEIGHBOR_ADVERT: 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 if (code != 0) 704 goto badcode; 705 if (icmp6len < sizeof(struct nd_redirect)) 706 goto badlen; 707 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { 708 /* give up local */ 709 icmp6_redirect_input(m, off); 710 m = NULL; 711 goto freeit; 712 } 713 icmp6_redirect_input(n, off); 714 /* m stays. */ 715 break; 716 717 case ICMP6_ROUTER_RENUMBERING: 718 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND && 719 code != ICMP6_ROUTER_RENUMBERING_RESULT) 720 goto badcode; 721 if (icmp6len < sizeof(struct icmp6_router_renum)) 722 goto badlen; 723 break; 724 725 default: 726 nd6log((LOG_DEBUG, 727 "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%u)\n", 728 icmp6->icmp6_type, 729 inet_ntop(AF_INET6, &ip6->ip6_src, src, sizeof(src)), 730 inet_ntop(AF_INET6, &ip6->ip6_dst, dst, sizeof(dst)), 731 m->m_pkthdr.ph_ifidx)); 732 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) { 733 /* ICMPv6 error: MUST deliver it by spec... */ 734 code = PRC_NCMDS; 735 /* deliver */ 736 } else { 737 /* ICMPv6 informational: MUST not deliver */ 738 break; 739 } 740 deliver: 741 if (icmp6_notify_error(m, off, icmp6len, code)) { 742 /* In this case, m should've been freed. */ 743 return (IPPROTO_DONE); 744 } 745 break; 746 747 badcode: 748 icmp6stat_inc(icp6s_badcode); 749 break; 750 751 badlen: 752 icmp6stat_inc(icp6s_badlen); 753 break; 754 } 755 756 #if NPF > 0 757 raw: 758 #endif 759 /* deliver the packet to appropriate sockets */ 760 return rip6_input(mp, offp, proto, af); 761 762 freeit: 763 m_freem(m); 764 return IPPROTO_DONE; 765 } 766 767 int 768 icmp6_notify_error(struct mbuf *m, int off, int icmp6len, int code) 769 { 770 struct icmp6_hdr *icmp6; 771 struct ip6_hdr *eip6; 772 u_int32_t notifymtu; 773 struct sockaddr_in6 icmp6src, icmp6dst; 774 775 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) { 776 icmp6stat_inc(icp6s_tooshort); 777 goto freeit; 778 } 779 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 780 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 781 if (icmp6 == NULL) { 782 icmp6stat_inc(icp6s_tooshort); 783 return (-1); 784 } 785 eip6 = (struct ip6_hdr *)(icmp6 + 1); 786 787 /* Detect the upper level protocol */ 788 { 789 void (*ctlfunc)(int, struct sockaddr *, u_int, void *); 790 u_int8_t nxt = eip6->ip6_nxt; 791 int eoff = off + sizeof(struct icmp6_hdr) + 792 sizeof(struct ip6_hdr); 793 struct ip6ctlparam ip6cp; 794 struct in6_addr *finaldst = NULL; 795 int icmp6type = icmp6->icmp6_type; 796 struct ip6_frag *fh; 797 struct ip6_rthdr *rth; 798 struct ip6_rthdr0 *rth0; 799 int rthlen; 800 801 while (1) { /* XXX: should avoid infinite loop explicitly? */ 802 struct ip6_ext *eh; 803 804 switch (nxt) { 805 case IPPROTO_HOPOPTS: 806 case IPPROTO_DSTOPTS: 807 case IPPROTO_AH: 808 IP6_EXTHDR_GET(eh, struct ip6_ext *, m, 809 eoff, sizeof(*eh)); 810 if (eh == NULL) { 811 icmp6stat_inc(icp6s_tooshort); 812 return (-1); 813 } 814 815 if (nxt == IPPROTO_AH) 816 eoff += (eh->ip6e_len + 2) << 2; 817 else 818 eoff += (eh->ip6e_len + 1) << 3; 819 nxt = eh->ip6e_nxt; 820 break; 821 case IPPROTO_ROUTING: 822 /* 823 * When the erroneous packet contains a 824 * routing header, we should examine the 825 * header to determine the final destination. 826 * Otherwise, we can't properly update 827 * information that depends on the final 828 * destination (e.g. path MTU). 829 */ 830 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m, 831 eoff, sizeof(*rth)); 832 if (rth == NULL) { 833 icmp6stat_inc(icp6s_tooshort); 834 return (-1); 835 } 836 rthlen = (rth->ip6r_len + 1) << 3; 837 /* 838 * XXX: currently there is no 839 * officially defined type other 840 * than type-0. 841 * Note that if the segment left field 842 * is 0, all intermediate hops must 843 * have been passed. 844 */ 845 if (rth->ip6r_segleft && 846 rth->ip6r_type == IPV6_RTHDR_TYPE_0) { 847 int hops; 848 849 IP6_EXTHDR_GET(rth0, 850 struct ip6_rthdr0 *, m, 851 eoff, rthlen); 852 if (rth0 == NULL) { 853 icmp6stat_inc(icp6s_tooshort); 854 return (-1); 855 } 856 /* just ignore a bogus header */ 857 if ((rth0->ip6r0_len % 2) == 0 && 858 (hops = rth0->ip6r0_len/2)) 859 finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1); 860 } 861 eoff += rthlen; 862 nxt = rth->ip6r_nxt; 863 break; 864 case IPPROTO_FRAGMENT: 865 IP6_EXTHDR_GET(fh, struct ip6_frag *, m, 866 eoff, sizeof(*fh)); 867 if (fh == NULL) { 868 icmp6stat_inc(icp6s_tooshort); 869 return (-1); 870 } 871 /* 872 * Data after a fragment header is meaningless 873 * unless it is the first fragment, but 874 * we'll go to the notify label for path MTU 875 * discovery. 876 */ 877 if (fh->ip6f_offlg & IP6F_OFF_MASK) 878 goto notify; 879 880 eoff += sizeof(struct ip6_frag); 881 nxt = fh->ip6f_nxt; 882 break; 883 default: 884 /* 885 * This case includes ESP and the No Next 886 * Header. In such cases going to the notify 887 * label does not have any meaning 888 * (i.e. ctlfunc will be NULL), but we go 889 * anyway since we might have to update 890 * path MTU information. 891 */ 892 goto notify; 893 } 894 } 895 notify: 896 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, 897 sizeof(*icmp6) + sizeof(struct ip6_hdr)); 898 if (icmp6 == NULL) { 899 icmp6stat_inc(icp6s_tooshort); 900 return (-1); 901 } 902 903 eip6 = (struct ip6_hdr *)(icmp6 + 1); 904 bzero(&icmp6dst, sizeof(icmp6dst)); 905 icmp6dst.sin6_len = sizeof(struct sockaddr_in6); 906 icmp6dst.sin6_family = AF_INET6; 907 if (finaldst == NULL) 908 icmp6dst.sin6_addr = eip6->ip6_dst; 909 else 910 icmp6dst.sin6_addr = *finaldst; 911 icmp6dst.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.ph_ifidx, 912 &icmp6dst.sin6_addr); 913 if (in6_embedscope(&icmp6dst.sin6_addr, &icmp6dst, NULL)) { 914 /* should be impossible */ 915 nd6log((LOG_DEBUG, 916 "icmp6_notify_error: in6_embedscope failed\n")); 917 goto freeit; 918 } 919 920 /* 921 * retrieve parameters from the inner IPv6 header, and convert 922 * them into sockaddr structures. 923 */ 924 bzero(&icmp6src, sizeof(icmp6src)); 925 icmp6src.sin6_len = sizeof(struct sockaddr_in6); 926 icmp6src.sin6_family = AF_INET6; 927 icmp6src.sin6_addr = eip6->ip6_src; 928 icmp6src.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.ph_ifidx, 929 &icmp6src.sin6_addr); 930 if (in6_embedscope(&icmp6src.sin6_addr, &icmp6src, NULL)) { 931 /* should be impossible */ 932 nd6log((LOG_DEBUG, 933 "icmp6_notify_error: in6_embedscope failed\n")); 934 goto freeit; 935 } 936 icmp6src.sin6_flowinfo = 937 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK); 938 939 if (finaldst == NULL) 940 finaldst = &eip6->ip6_dst; 941 ip6cp.ip6c_m = m; 942 ip6cp.ip6c_icmp6 = icmp6; 943 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1); 944 ip6cp.ip6c_off = eoff; 945 ip6cp.ip6c_finaldst = finaldst; 946 ip6cp.ip6c_src = &icmp6src; 947 ip6cp.ip6c_nxt = nxt; 948 #if NPF > 0 949 pf_pkt_addr_changed(m); 950 #endif 951 952 if (icmp6type == ICMP6_PACKET_TOO_BIG) { 953 notifymtu = ntohl(icmp6->icmp6_mtu); 954 ip6cp.ip6c_cmdarg = (void *)¬ifymtu; 955 } 956 957 ctlfunc = inet6sw[ip6_protox[nxt]].pr_ctlinput; 958 if (ctlfunc) 959 (*ctlfunc)(code, sin6tosa(&icmp6dst), 960 m->m_pkthdr.ph_rtableid, &ip6cp); 961 } 962 return (0); 963 964 freeit: 965 m_freem(m); 966 return (-1); 967 } 968 969 void 970 icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated) 971 { 972 unsigned long rtcount; 973 struct icmp6_mtudisc_callback *mc; 974 struct in6_addr *dst = ip6cp->ip6c_finaldst; 975 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6; 976 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */ 977 u_int mtu = ntohl(icmp6->icmp6_mtu); 978 struct rtentry *rt = NULL; 979 struct sockaddr_in6 sin6; 980 981 if (mtu < IPV6_MMTU) 982 return; 983 984 /* 985 * allow non-validated cases if memory is plenty, to make traffic 986 * from non-connected pcb happy. 987 */ 988 rtcount = rt_timer_queue_count(&icmp6_mtudisc_timeout_q); 989 if (validated) { 990 if (0 <= icmp6_mtudisc_hiwat && rtcount > icmp6_mtudisc_hiwat) 991 return; 992 else if (0 <= icmp6_mtudisc_lowat && 993 rtcount > icmp6_mtudisc_lowat) { 994 /* 995 * XXX nuke a victim, install the new one. 996 */ 997 } 998 } else { 999 if (0 <= icmp6_mtudisc_lowat && rtcount > icmp6_mtudisc_lowat) 1000 return; 1001 } 1002 1003 bzero(&sin6, sizeof(sin6)); 1004 sin6.sin6_family = PF_INET6; 1005 sin6.sin6_len = sizeof(struct sockaddr_in6); 1006 sin6.sin6_addr = *dst; 1007 /* XXX normally, this won't happen */ 1008 if (IN6_IS_ADDR_LINKLOCAL(dst)) { 1009 sin6.sin6_addr.s6_addr16[1] = htons(m->m_pkthdr.ph_ifidx); 1010 } 1011 sin6.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.ph_ifidx, 1012 &sin6.sin6_addr); 1013 1014 rt = icmp6_mtudisc_clone(&sin6, m->m_pkthdr.ph_rtableid, 0); 1015 1016 if (rt != NULL && ISSET(rt->rt_flags, RTF_HOST) && 1017 !(rt->rt_locks & RTV_MTU) && 1018 (rt->rt_mtu > mtu || rt->rt_mtu == 0)) { 1019 struct ifnet *ifp; 1020 1021 ifp = if_get(rt->rt_ifidx); 1022 if (ifp != NULL && mtu < ifp->if_mtu) { 1023 icmp6stat_inc(icp6s_pmtuchg); 1024 rt->rt_mtu = mtu; 1025 } 1026 if_put(ifp); 1027 } 1028 rtfree(rt); 1029 1030 /* 1031 * Notify protocols that the MTU for this destination 1032 * has changed. 1033 */ 1034 LIST_FOREACH(mc, &icmp6_mtudisc_callbacks, mc_list) 1035 (*mc->mc_func)(&sin6, m->m_pkthdr.ph_rtableid); 1036 } 1037 1038 /* 1039 * Reflect the ip6 packet back to the source. 1040 * OFF points to the icmp6 header, counted from the top of the mbuf. 1041 */ 1042 int 1043 icmp6_reflect(struct mbuf **mp, size_t off, struct sockaddr *sa) 1044 { 1045 struct mbuf *m = *mp; 1046 struct rtentry *rt = NULL; 1047 struct ip6_hdr *ip6; 1048 struct icmp6_hdr *icmp6; 1049 struct in6_addr t, *src = NULL; 1050 struct sockaddr_in6 sa6_src, sa6_dst; 1051 u_int rtableid; 1052 u_int8_t pfflags; 1053 1054 CTASSERT(sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) <= MHLEN); 1055 1056 /* too short to reflect */ 1057 if (off < sizeof(struct ip6_hdr)) { 1058 nd6log((LOG_DEBUG, 1059 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n", 1060 (u_long)off, (u_long)sizeof(struct ip6_hdr), 1061 __FILE__, __LINE__)); 1062 goto bad; 1063 } 1064 1065 if (m->m_pkthdr.ph_loopcnt++ >= M_MAXLOOP) { 1066 m_freemp(mp); 1067 return (ELOOP); 1068 } 1069 rtableid = m->m_pkthdr.ph_rtableid; 1070 pfflags = m->m_pkthdr.pf.flags; 1071 m_resethdr(m); 1072 m->m_pkthdr.ph_rtableid = rtableid; 1073 m->m_pkthdr.pf.flags = pfflags & PF_TAG_GENERATED; 1074 1075 /* 1076 * If there are extra headers between IPv6 and ICMPv6, strip 1077 * off that header first. 1078 */ 1079 if (off > sizeof(struct ip6_hdr)) { 1080 size_t l; 1081 struct ip6_hdr nip6; 1082 1083 l = off - sizeof(struct ip6_hdr); 1084 m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6); 1085 m_adj(m, l); 1086 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 1087 if (m->m_len < l) { 1088 if ((m = *mp = m_pullup(m, l)) == NULL) 1089 return (EMSGSIZE); 1090 } 1091 memcpy(mtod(m, caddr_t), &nip6, sizeof(nip6)); 1092 } else /* off == sizeof(struct ip6_hdr) */ { 1093 size_t l; 1094 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr); 1095 if (m->m_len < l) { 1096 if ((m = *mp = m_pullup(m, l)) == NULL) 1097 return (EMSGSIZE); 1098 } 1099 } 1100 ip6 = mtod(m, struct ip6_hdr *); 1101 ip6->ip6_nxt = IPPROTO_ICMPV6; 1102 icmp6 = (struct icmp6_hdr *)(ip6 + 1); 1103 1104 t = ip6->ip6_dst; 1105 /* 1106 * ip6_input() drops a packet if its src is multicast. 1107 * So, the src is never multicast. 1108 */ 1109 ip6->ip6_dst = ip6->ip6_src; 1110 1111 /* 1112 * XXX: make sure to embed scope zone information, using 1113 * already embedded IDs or the received interface (if any). 1114 * Note that rcvif may be NULL. 1115 * TODO: scoped routing case (XXX). 1116 */ 1117 bzero(&sa6_src, sizeof(sa6_src)); 1118 sa6_src.sin6_family = AF_INET6; 1119 sa6_src.sin6_len = sizeof(sa6_src); 1120 sa6_src.sin6_addr = ip6->ip6_dst; 1121 bzero(&sa6_dst, sizeof(sa6_dst)); 1122 sa6_dst.sin6_family = AF_INET6; 1123 sa6_dst.sin6_len = sizeof(sa6_dst); 1124 sa6_dst.sin6_addr = t; 1125 1126 if (sa == NULL) { 1127 /* 1128 * If the incoming packet was addressed directly to us (i.e. 1129 * unicast), use dst as the src for the reply. The 1130 * IN6_IFF_TENTATIVE|IN6_IFF_DUPLICATED case would be VERY rare, 1131 * but is possible (for example) when we encounter an error 1132 * while forwarding procedure destined to a duplicated address 1133 * of ours. 1134 */ 1135 rt = rtalloc(sin6tosa(&sa6_dst), 0, rtableid); 1136 if (rtisvalid(rt) && ISSET(rt->rt_flags, RTF_LOCAL) && 1137 !ISSET(ifatoia6(rt->rt_ifa)->ia6_flags, 1138 IN6_IFF_ANYCAST|IN6_IFF_TENTATIVE|IN6_IFF_DUPLICATED)) { 1139 src = &t; 1140 } 1141 rtfree(rt); 1142 rt = NULL; 1143 sa = sin6tosa(&sa6_src); 1144 } 1145 1146 if (src == NULL) { 1147 struct in6_ifaddr *ia6; 1148 1149 /* 1150 * This case matches to multicasts, our anycast, or unicasts 1151 * that we do not own. Select a source address based on the 1152 * source address of the erroneous packet. 1153 */ 1154 rt = rtalloc(sa, RT_RESOLVE, rtableid); 1155 if (!rtisvalid(rt)) { 1156 char addr[INET6_ADDRSTRLEN]; 1157 1158 nd6log((LOG_DEBUG, 1159 "%s: source can't be determined: dst=%s\n", 1160 __func__, inet_ntop(AF_INET6, &sa6_src.sin6_addr, 1161 addr, sizeof(addr)))); 1162 rtfree(rt); 1163 goto bad; 1164 } 1165 ia6 = in6_ifawithscope(rt->rt_ifa->ifa_ifp, &t, rtableid); 1166 if (ia6 != NULL) 1167 src = &ia6->ia_addr.sin6_addr; 1168 if (src == NULL) 1169 src = &ifatoia6(rt->rt_ifa)->ia_addr.sin6_addr; 1170 } 1171 1172 ip6->ip6_src = *src; 1173 rtfree(rt); 1174 1175 ip6->ip6_flow = 0; 1176 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 1177 ip6->ip6_vfc |= IPV6_VERSION; 1178 ip6->ip6_nxt = IPPROTO_ICMPV6; 1179 ip6->ip6_hlim = ip6_defhlim; 1180 1181 icmp6->icmp6_cksum = 0; 1182 m->m_pkthdr.csum_flags = M_ICMP_CSUM_OUT; 1183 1184 /* 1185 * XXX option handling 1186 */ 1187 1188 m->m_flags &= ~(M_BCAST|M_MCAST); 1189 return (0); 1190 1191 bad: 1192 m_freemp(mp); 1193 return (EHOSTUNREACH); 1194 } 1195 1196 void 1197 icmp6_fasttimo(void) 1198 { 1199 1200 mld6_fasttimeo(); 1201 } 1202 1203 const char * 1204 icmp6_redirect_diag(struct in6_addr *src6, struct in6_addr *dst6, 1205 struct in6_addr *tgt6) 1206 { 1207 static char buf[1024]; /* XXX */ 1208 char src[INET6_ADDRSTRLEN]; 1209 char dst[INET6_ADDRSTRLEN]; 1210 char tgt[INET6_ADDRSTRLEN]; 1211 1212 snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)", 1213 inet_ntop(AF_INET6, src6, src, sizeof(src)), 1214 inet_ntop(AF_INET6, dst6, dst, sizeof(dst)), 1215 inet_ntop(AF_INET6, tgt6, tgt, sizeof(tgt))); 1216 return buf; 1217 } 1218 1219 void 1220 icmp6_redirect_input(struct mbuf *m, int off) 1221 { 1222 struct ifnet *ifp; 1223 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1224 struct nd_redirect *nd_rd; 1225 int icmp6len = ntohs(ip6->ip6_plen); 1226 char *lladdr = NULL; 1227 int lladdrlen = 0; 1228 struct rtentry *rt = NULL; 1229 int is_router; 1230 int is_onlink; 1231 struct in6_addr src6 = ip6->ip6_src; 1232 struct in6_addr redtgt6; 1233 struct in6_addr reddst6; 1234 struct nd_opts ndopts; 1235 char addr[INET6_ADDRSTRLEN]; 1236 1237 ifp = if_get(m->m_pkthdr.ph_ifidx); 1238 if (ifp == NULL) 1239 return; 1240 1241 /* XXX if we are router, we don't update route by icmp6 redirect */ 1242 if (ip6_forwarding) 1243 goto freeit; 1244 if (!(ifp->if_xflags & IFXF_AUTOCONF6)) 1245 goto freeit; 1246 1247 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len); 1248 if (nd_rd == NULL) { 1249 icmp6stat_inc(icp6s_tooshort); 1250 if_put(ifp); 1251 return; 1252 } 1253 redtgt6 = nd_rd->nd_rd_target; 1254 reddst6 = nd_rd->nd_rd_dst; 1255 1256 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 1257 redtgt6.s6_addr16[1] = htons(ifp->if_index); 1258 if (IN6_IS_ADDR_LINKLOCAL(&reddst6)) 1259 reddst6.s6_addr16[1] = htons(ifp->if_index); 1260 1261 /* validation */ 1262 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) { 1263 nd6log((LOG_ERR, 1264 "ICMP6 redirect sent from %s rejected; " 1265 "must be from linklocal\n", 1266 inet_ntop(AF_INET6, &src6, addr, sizeof(addr)))); 1267 goto bad; 1268 } 1269 if (ip6->ip6_hlim != 255) { 1270 nd6log((LOG_ERR, 1271 "ICMP6 redirect sent from %s rejected; " 1272 "hlim=%d (must be 255)\n", 1273 inet_ntop(AF_INET6, &src6, addr, sizeof(addr)), 1274 ip6->ip6_hlim)); 1275 goto bad; 1276 } 1277 if (IN6_IS_ADDR_MULTICAST(&reddst6)) { 1278 nd6log((LOG_ERR, 1279 "ICMP6 redirect rejected; " 1280 "redirect dst must be unicast: %s\n", 1281 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 1282 goto bad; 1283 } 1284 { 1285 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */ 1286 struct sockaddr_in6 sin6; 1287 struct in6_addr *gw6; 1288 1289 bzero(&sin6, sizeof(sin6)); 1290 sin6.sin6_family = AF_INET6; 1291 sin6.sin6_len = sizeof(struct sockaddr_in6); 1292 memcpy(&sin6.sin6_addr, &reddst6, sizeof(reddst6)); 1293 rt = rtalloc(sin6tosa(&sin6), 0, m->m_pkthdr.ph_rtableid); 1294 if (rt) { 1295 if (rt->rt_gateway == NULL || 1296 rt->rt_gateway->sa_family != AF_INET6) { 1297 nd6log((LOG_ERR, 1298 "ICMP6 redirect rejected; no route " 1299 "with inet6 gateway found for redirect dst: %s\n", 1300 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 1301 rtfree(rt); 1302 goto bad; 1303 } 1304 1305 gw6 = &(satosin6(rt->rt_gateway)->sin6_addr); 1306 if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) { 1307 nd6log((LOG_ERR, 1308 "ICMP6 redirect rejected; " 1309 "not equal to gw-for-src=%s (must be same): " 1310 "%s\n", 1311 inet_ntop(AF_INET6, gw6, addr, sizeof(addr)), 1312 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 1313 rtfree(rt); 1314 goto bad; 1315 } 1316 } else { 1317 nd6log((LOG_ERR, 1318 "ICMP6 redirect rejected; " 1319 "no route found for redirect dst: %s\n", 1320 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 1321 goto bad; 1322 } 1323 rtfree(rt); 1324 rt = NULL; 1325 } 1326 1327 is_router = is_onlink = 0; 1328 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6)) 1329 is_router = 1; /* router case */ 1330 if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0) 1331 is_onlink = 1; /* on-link destination case */ 1332 if (!is_router && !is_onlink) { 1333 nd6log((LOG_ERR, 1334 "ICMP6 redirect rejected; " 1335 "neither router case nor onlink case: %s\n", 1336 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 1337 goto bad; 1338 } 1339 /* validation passed */ 1340 1341 icmp6len -= sizeof(*nd_rd); 1342 if (nd6_options(nd_rd + 1, icmp6len, &ndopts) < 0) { 1343 nd6log((LOG_INFO, "icmp6_redirect_input: " 1344 "invalid ND option, rejected: %s\n", 1345 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 1346 /* nd6_options have incremented stats */ 1347 goto freeit; 1348 } 1349 1350 if (ndopts.nd_opts_tgt_lladdr) { 1351 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 1352 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 1353 } 1354 1355 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 1356 nd6log((LOG_INFO, 1357 "icmp6_redirect_input: lladdrlen mismatch for %s " 1358 "(if %d, icmp6 packet %d): %s\n", 1359 inet_ntop(AF_INET6, &redtgt6, addr, sizeof(addr)), 1360 ifp->if_addrlen, lladdrlen - 2, 1361 icmp6_redirect_diag(&src6, &reddst6, &redtgt6))); 1362 goto bad; 1363 } 1364 1365 /* RFC 2461 8.3 */ 1366 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT, 1367 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER); 1368 1369 if (!is_onlink) { /* better router case. perform rtredirect. */ 1370 /* perform rtredirect */ 1371 struct sockaddr_in6 sdst; 1372 struct sockaddr_in6 sgw; 1373 struct sockaddr_in6 ssrc; 1374 unsigned long rtcount; 1375 struct rtentry *newrt = NULL; 1376 1377 /* 1378 * do not install redirect route, if the number of entries 1379 * is too much (> hiwat). note that, the node (= host) will 1380 * work just fine even if we do not install redirect route 1381 * (there will be additional hops, though). 1382 */ 1383 rtcount = rt_timer_queue_count(&icmp6_redirect_timeout_q); 1384 if (0 <= ip6_maxdynroutes && rtcount >= ip6_maxdynroutes) 1385 goto freeit; 1386 1387 bzero(&sdst, sizeof(sdst)); 1388 bzero(&sgw, sizeof(sgw)); 1389 bzero(&ssrc, sizeof(ssrc)); 1390 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6; 1391 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len = 1392 sizeof(struct sockaddr_in6); 1393 memcpy(&sgw.sin6_addr, &redtgt6, sizeof(struct in6_addr)); 1394 memcpy(&sdst.sin6_addr, &reddst6, sizeof(struct in6_addr)); 1395 memcpy(&ssrc.sin6_addr, &src6, sizeof(struct in6_addr)); 1396 rtredirect(sin6tosa(&sdst), sin6tosa(&sgw), sin6tosa(&ssrc), 1397 &newrt, m->m_pkthdr.ph_rtableid); 1398 if (newrt != NULL && icmp6_redirtimeout > 0) { 1399 rt_timer_add(newrt, &icmp6_redirect_timeout_q, 1400 m->m_pkthdr.ph_rtableid); 1401 } 1402 rtfree(newrt); 1403 } 1404 /* finally update cached route in each socket via pfctlinput */ 1405 { 1406 struct sockaddr_in6 sdst; 1407 1408 bzero(&sdst, sizeof(sdst)); 1409 sdst.sin6_family = AF_INET6; 1410 sdst.sin6_len = sizeof(struct sockaddr_in6); 1411 memcpy(&sdst.sin6_addr, &reddst6, sizeof(struct in6_addr)); 1412 pfctlinput(PRC_REDIRECT_HOST, sin6tosa(&sdst)); 1413 } 1414 1415 freeit: 1416 if_put(ifp); 1417 m_freem(m); 1418 return; 1419 1420 bad: 1421 if_put(ifp); 1422 icmp6stat_inc(icp6s_badredirect); 1423 m_freem(m); 1424 } 1425 1426 void 1427 icmp6_redirect_output(struct mbuf *m0, struct rtentry *rt) 1428 { 1429 struct ifnet *ifp = NULL; 1430 struct in6_addr *ifp_ll6; 1431 struct in6_addr *nexthop; 1432 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */ 1433 struct mbuf *m = NULL; /* newly allocated one */ 1434 struct ip6_hdr *ip6; /* m as struct ip6_hdr */ 1435 struct nd_redirect *nd_rd; 1436 size_t maxlen; 1437 u_char *p; 1438 struct sockaddr_in6 src_sa; 1439 1440 icmp6_errcount(ND_REDIRECT, 0); 1441 1442 /* if we are not router, we don't send icmp6 redirect */ 1443 if (!ip6_forwarding) 1444 goto fail; 1445 1446 /* sanity check */ 1447 if (m0 == NULL || !rtisvalid(rt)) 1448 goto fail; 1449 1450 ifp = if_get(rt->rt_ifidx); 1451 if (ifp == NULL) 1452 goto fail; 1453 1454 /* 1455 * Address check: 1456 * the source address must identify a neighbor, and 1457 * the destination address must not be a multicast address 1458 * [RFC 2461, sec 8.2] 1459 */ 1460 sip6 = mtod(m0, struct ip6_hdr *); 1461 bzero(&src_sa, sizeof(src_sa)); 1462 src_sa.sin6_family = AF_INET6; 1463 src_sa.sin6_len = sizeof(src_sa); 1464 src_sa.sin6_addr = sip6->ip6_src; 1465 /* we don't currently use sin6_scope_id, but eventually use it */ 1466 src_sa.sin6_scope_id = in6_addr2scopeid(ifp->if_index, &sip6->ip6_src); 1467 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0) 1468 goto fail; 1469 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst)) 1470 goto fail; /* what should we do here? */ 1471 1472 /* rate limit */ 1473 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0)) 1474 goto fail; 1475 1476 /* 1477 * Since we are going to append up to 1280 bytes (= IPV6_MMTU), 1478 * we almost always ask for an mbuf cluster for simplicity. 1479 * (MHLEN < IPV6_MMTU is almost always true) 1480 */ 1481 #if IPV6_MMTU >= MCLBYTES 1482 # error assumption failed about IPV6_MMTU and MCLBYTES 1483 #endif 1484 MGETHDR(m, M_DONTWAIT, MT_HEADER); 1485 if (m && IPV6_MMTU >= MHLEN) 1486 MCLGET(m, M_DONTWAIT); 1487 if (!m) 1488 goto fail; 1489 m->m_pkthdr.ph_ifidx = 0; 1490 m->m_len = 0; 1491 maxlen = m_trailingspace(m); 1492 maxlen = min(IPV6_MMTU, maxlen); 1493 /* just for safety */ 1494 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) + 1495 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) { 1496 goto fail; 1497 } 1498 1499 { 1500 /* get ip6 linklocal address for ifp(my outgoing interface). */ 1501 struct in6_ifaddr *ia6; 1502 if ((ia6 = in6ifa_ifpforlinklocal(ifp, IN6_IFF_TENTATIVE| 1503 IN6_IFF_DUPLICATED|IN6_IFF_ANYCAST)) == NULL) 1504 goto fail; 1505 ifp_ll6 = &ia6->ia_addr.sin6_addr; 1506 } 1507 1508 /* get ip6 linklocal address for the router. */ 1509 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) { 1510 struct sockaddr_in6 *sin6; 1511 sin6 = satosin6(rt->rt_gateway); 1512 nexthop = &sin6->sin6_addr; 1513 if (!IN6_IS_ADDR_LINKLOCAL(nexthop)) 1514 nexthop = NULL; 1515 } else 1516 nexthop = NULL; 1517 1518 /* ip6 */ 1519 ip6 = mtod(m, struct ip6_hdr *); 1520 ip6->ip6_flow = 0; 1521 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 1522 ip6->ip6_vfc |= IPV6_VERSION; 1523 /* ip6->ip6_plen will be set later */ 1524 ip6->ip6_nxt = IPPROTO_ICMPV6; 1525 ip6->ip6_hlim = 255; 1526 /* ip6->ip6_src must be linklocal addr for my outgoing if. */ 1527 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr)); 1528 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr)); 1529 1530 /* ND Redirect */ 1531 nd_rd = (struct nd_redirect *)(ip6 + 1); 1532 nd_rd->nd_rd_type = ND_REDIRECT; 1533 nd_rd->nd_rd_code = 0; 1534 nd_rd->nd_rd_reserved = 0; 1535 if (rt->rt_flags & RTF_GATEWAY) { 1536 /* 1537 * nd_rd->nd_rd_target must be a link-local address in 1538 * better router cases. 1539 */ 1540 if (!nexthop) 1541 goto fail; 1542 bcopy(nexthop, &nd_rd->nd_rd_target, 1543 sizeof(nd_rd->nd_rd_target)); 1544 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 1545 sizeof(nd_rd->nd_rd_dst)); 1546 } else { 1547 /* make sure redtgt == reddst */ 1548 nexthop = &sip6->ip6_dst; 1549 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target, 1550 sizeof(nd_rd->nd_rd_target)); 1551 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst, 1552 sizeof(nd_rd->nd_rd_dst)); 1553 } 1554 1555 p = (u_char *)(nd_rd + 1); 1556 1557 { 1558 /* target lladdr option */ 1559 struct rtentry *nrt; 1560 int len; 1561 struct sockaddr_dl *sdl; 1562 struct nd_opt_hdr *nd_opt; 1563 char *lladdr; 1564 1565 len = sizeof(*nd_opt) + ifp->if_addrlen; 1566 len = (len + 7) & ~7; /* round by 8 */ 1567 /* safety check */ 1568 if (len + (p - (u_char *)ip6) > maxlen) 1569 goto nolladdropt; 1570 nrt = nd6_lookup(nexthop, 0, ifp, ifp->if_rdomain); 1571 if ((nrt != NULL) && 1572 (nrt->rt_flags & (RTF_GATEWAY|RTF_LLINFO)) == RTF_LLINFO && 1573 (nrt->rt_gateway->sa_family == AF_LINK) && 1574 (sdl = satosdl(nrt->rt_gateway)) && 1575 sdl->sdl_alen) { 1576 nd_opt = (struct nd_opt_hdr *)p; 1577 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 1578 nd_opt->nd_opt_len = len >> 3; 1579 lladdr = (char *)(nd_opt + 1); 1580 bcopy(LLADDR(sdl), lladdr, ifp->if_addrlen); 1581 p += len; 1582 } 1583 rtfree(nrt); 1584 } 1585 nolladdropt:; 1586 1587 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 1588 1589 /* just to be safe */ 1590 if (p - (u_char *)ip6 > maxlen) 1591 goto noredhdropt; 1592 1593 { 1594 /* redirected header option */ 1595 int len; 1596 struct nd_opt_rd_hdr *nd_opt_rh; 1597 1598 /* 1599 * compute the maximum size for icmp6 redirect header option. 1600 * XXX room for auth header? 1601 */ 1602 len = maxlen - (p - (u_char *)ip6); 1603 len &= ~7; 1604 1605 /* 1606 * Redirected header option spec (RFC2461 4.6.3) talks nothing 1607 * about padding/truncate rule for the original IP packet. 1608 * From the discussion on IPv6imp in Feb 1999, 1609 * the consensus was: 1610 * - "attach as much as possible" is the goal 1611 * - pad if not aligned (original size can be guessed by 1612 * original ip6 header) 1613 * Following code adds the padding if it is simple enough, 1614 * and truncates if not. 1615 */ 1616 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) { 1617 /* not enough room, truncate */ 1618 m_adj(m0, (len - sizeof(*nd_opt_rh)) - 1619 m0->m_pkthdr.len); 1620 } else { 1621 /* 1622 * enough room, truncate if not aligned. 1623 * we don't pad here for simplicity. 1624 */ 1625 size_t extra; 1626 1627 extra = m0->m_pkthdr.len % 8; 1628 if (extra) { 1629 /* truncate */ 1630 m_adj(m0, -extra); 1631 } 1632 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh); 1633 } 1634 1635 nd_opt_rh = (struct nd_opt_rd_hdr *)p; 1636 bzero(nd_opt_rh, sizeof(*nd_opt_rh)); 1637 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER; 1638 nd_opt_rh->nd_opt_rh_len = len >> 3; 1639 p += sizeof(*nd_opt_rh); 1640 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6; 1641 1642 /* connect m0 to m */ 1643 m->m_pkthdr.len += m0->m_pkthdr.len; 1644 m_cat(m, m0); 1645 m0 = NULL; 1646 } 1647 noredhdropt: 1648 m_freem(m0); 1649 m0 = NULL; 1650 1651 sip6 = mtod(m, struct ip6_hdr *); 1652 if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_src)) 1653 sip6->ip6_src.s6_addr16[1] = 0; 1654 if (IN6_IS_ADDR_LINKLOCAL(&sip6->ip6_dst)) 1655 sip6->ip6_dst.s6_addr16[1] = 0; 1656 #if 0 1657 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src)) 1658 ip6->ip6_src.s6_addr16[1] = 0; 1659 if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) 1660 ip6->ip6_dst.s6_addr16[1] = 0; 1661 #endif 1662 if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_target)) 1663 nd_rd->nd_rd_target.s6_addr16[1] = 0; 1664 if (IN6_IS_ADDR_LINKLOCAL(&nd_rd->nd_rd_dst)) 1665 nd_rd->nd_rd_dst.s6_addr16[1] = 0; 1666 1667 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 1668 1669 nd_rd->nd_rd_cksum = 0; 1670 m->m_pkthdr.csum_flags = M_ICMP_CSUM_OUT; 1671 1672 /* send the packet to outside... */ 1673 ip6_output(m, NULL, NULL, 0, NULL, NULL); 1674 1675 icmp6stat_inc(icp6s_outhist + ND_REDIRECT); 1676 1677 if_put(ifp); 1678 return; 1679 1680 fail: 1681 if_put(ifp); 1682 m_freem(m); 1683 m_freem(m0); 1684 } 1685 1686 /* 1687 * ICMPv6 socket option processing. 1688 */ 1689 int 1690 icmp6_ctloutput(int op, struct socket *so, int level, int optname, 1691 struct mbuf *m) 1692 { 1693 int error = 0; 1694 struct inpcb *in6p = sotoinpcb(so); 1695 1696 if (level != IPPROTO_ICMPV6) 1697 return EINVAL; 1698 1699 switch (op) { 1700 case PRCO_SETOPT: 1701 switch (optname) { 1702 case ICMP6_FILTER: 1703 { 1704 struct icmp6_filter *p; 1705 1706 if (m == NULL || m->m_len != sizeof(*p)) { 1707 error = EMSGSIZE; 1708 break; 1709 } 1710 p = mtod(m, struct icmp6_filter *); 1711 if (!p || !in6p->inp_icmp6filt) { 1712 error = EINVAL; 1713 break; 1714 } 1715 bcopy(p, in6p->inp_icmp6filt, 1716 sizeof(struct icmp6_filter)); 1717 error = 0; 1718 break; 1719 } 1720 1721 default: 1722 error = ENOPROTOOPT; 1723 break; 1724 } 1725 break; 1726 1727 case PRCO_GETOPT: 1728 switch (optname) { 1729 case ICMP6_FILTER: 1730 { 1731 struct icmp6_filter *p; 1732 1733 if (!in6p->inp_icmp6filt) { 1734 error = EINVAL; 1735 break; 1736 } 1737 m->m_len = sizeof(struct icmp6_filter); 1738 p = mtod(m, struct icmp6_filter *); 1739 bcopy(in6p->inp_icmp6filt, p, 1740 sizeof(struct icmp6_filter)); 1741 error = 0; 1742 break; 1743 } 1744 1745 default: 1746 error = ENOPROTOOPT; 1747 break; 1748 } 1749 break; 1750 } 1751 1752 return (error); 1753 } 1754 1755 /* 1756 * Perform rate limit check. 1757 * Returns 0 if it is okay to send the icmp6 packet. 1758 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate 1759 * limitation. 1760 * 1761 * XXX per-destination/type check necessary? 1762 * 1763 * dst - not used at this moment 1764 * type - not used at this moment 1765 * code - not used at this moment 1766 */ 1767 int 1768 icmp6_ratelimit(const struct in6_addr *dst, const int type, const int code) 1769 { 1770 /* PPS limit */ 1771 if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count, 1772 icmp6errppslim)) 1773 return 1; /* The packet is subject to rate limit */ 1774 return 0; /* okay to send */ 1775 } 1776 1777 struct rtentry * 1778 icmp6_mtudisc_clone(struct sockaddr_in6 *dst, u_int rtableid, int ipsec) 1779 { 1780 struct rtentry *rt; 1781 int error; 1782 1783 rt = rtalloc(sin6tosa(dst), RT_RESOLVE, rtableid); 1784 1785 /* Check if the route is actually usable */ 1786 if (!rtisvalid(rt)) 1787 goto bad; 1788 /* IPsec needs the route only for PMTU, it can use reject for that */ 1789 if (!ipsec && (rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE))) 1790 goto bad; 1791 1792 /* 1793 * No PMTU for local routes and permanent neighbors, 1794 * ARP and NDP use the same expire timer as the route. 1795 */ 1796 if (ISSET(rt->rt_flags, RTF_LOCAL) || 1797 (ISSET(rt->rt_flags, RTF_LLINFO) && rt->rt_expire == 0)) 1798 goto bad; 1799 1800 /* If we didn't get a host route, allocate one */ 1801 if ((rt->rt_flags & RTF_HOST) == 0) { 1802 struct rtentry *nrt; 1803 struct rt_addrinfo info; 1804 struct sockaddr_rtlabel sa_rl; 1805 1806 memset(&info, 0, sizeof(info)); 1807 info.rti_ifa = rt->rt_ifa; 1808 info.rti_flags = RTF_GATEWAY | RTF_HOST | RTF_DYNAMIC; 1809 info.rti_info[RTAX_DST] = sin6tosa(dst); 1810 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 1811 info.rti_info[RTAX_LABEL] = 1812 rtlabel_id2sa(rt->rt_labelid, &sa_rl); 1813 1814 error = rtrequest(RTM_ADD, &info, rt->rt_priority, &nrt, 1815 rtableid); 1816 if (error) 1817 goto bad; 1818 nrt->rt_rmx = rt->rt_rmx; 1819 rtfree(rt); 1820 rt = nrt; 1821 rtm_send(rt, RTM_ADD, 0, rtableid); 1822 } 1823 error = rt_timer_add(rt, &icmp6_mtudisc_timeout_q, rtableid); 1824 if (error) 1825 goto bad; 1826 1827 return (rt); 1828 bad: 1829 rtfree(rt); 1830 return (NULL); 1831 } 1832 1833 void 1834 icmp6_mtudisc_timeout(struct rtentry *rt, u_int rtableid) 1835 { 1836 struct ifnet *ifp; 1837 1838 NET_ASSERT_LOCKED(); 1839 1840 ifp = if_get(rt->rt_ifidx); 1841 if (ifp == NULL) 1842 return; 1843 1844 if ((rt->rt_flags & (RTF_DYNAMIC|RTF_HOST)) == (RTF_DYNAMIC|RTF_HOST)) { 1845 rtdeletemsg(rt, ifp, rtableid); 1846 } else { 1847 if (!(rt->rt_locks & RTV_MTU)) 1848 rt->rt_mtu = 0; 1849 } 1850 1851 if_put(ifp); 1852 } 1853 1854 const struct sysctl_bounded_args icmpv6ctl_vars[] = { 1855 { ICMPV6CTL_ND6_DELAY, &nd6_delay, 0, INT_MAX }, 1856 { ICMPV6CTL_ND6_UMAXTRIES, &nd6_umaxtries, 0, INT_MAX }, 1857 { ICMPV6CTL_ND6_MMAXTRIES, &nd6_mmaxtries, 0, INT_MAX }, 1858 { ICMPV6CTL_ERRPPSLIMIT, &icmp6errppslim, -1, 1000 }, 1859 { ICMPV6CTL_ND6_MAXNUDHINT, &nd6_maxnudhint, 0, INT_MAX }, 1860 { ICMPV6CTL_MTUDISC_HIWAT, &icmp6_mtudisc_hiwat, -1, INT_MAX }, 1861 { ICMPV6CTL_MTUDISC_LOWAT, &icmp6_mtudisc_lowat, -1, INT_MAX }, 1862 { ICMPV6CTL_ND6_DEBUG, &nd6_debug, 0, 1 }, 1863 }; 1864 1865 int 1866 icmp6_sysctl_icmp6stat(void *oldp, size_t *oldlenp, void *newp) 1867 { 1868 struct icmp6stat *icmp6stat; 1869 int ret; 1870 1871 CTASSERT(sizeof(*icmp6stat) == icp6s_ncounters * sizeof(uint64_t)); 1872 icmp6stat = malloc(sizeof(*icmp6stat), M_TEMP, M_WAITOK|M_ZERO); 1873 counters_read(icmp6counters, (uint64_t *)icmp6stat, icp6s_ncounters); 1874 ret = sysctl_rdstruct(oldp, oldlenp, newp, 1875 icmp6stat, sizeof(*icmp6stat)); 1876 free(icmp6stat, M_TEMP, sizeof(*icmp6stat)); 1877 1878 return (ret); 1879 } 1880 1881 int 1882 icmp6_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, 1883 void *newp, size_t newlen) 1884 { 1885 int error; 1886 1887 /* All sysctl names at this level are terminal. */ 1888 if (namelen != 1) 1889 return (ENOTDIR); 1890 1891 switch (name[0]) { 1892 case ICMPV6CTL_REDIRTIMEOUT: 1893 NET_LOCK(); 1894 error = sysctl_int_bounded(oldp, oldlenp, newp, newlen, 1895 &icmp6_redirtimeout, 0, INT_MAX); 1896 rt_timer_queue_change(&icmp6_redirect_timeout_q, 1897 icmp6_redirtimeout); 1898 NET_UNLOCK(); 1899 break; 1900 1901 case ICMPV6CTL_STATS: 1902 error = icmp6_sysctl_icmp6stat(oldp, oldlenp, newp); 1903 break; 1904 1905 case ICMPV6CTL_ND6_QUEUED: 1906 error = sysctl_rdint(oldp, oldlenp, newp, 1907 atomic_load_int(&ln_hold_total)); 1908 break; 1909 1910 default: 1911 NET_LOCK(); 1912 error = sysctl_bounded_arr(icmpv6ctl_vars, 1913 nitems(icmpv6ctl_vars), name, namelen, oldp, oldlenp, newp, 1914 newlen); 1915 NET_UNLOCK(); 1916 break; 1917 } 1918 1919 return (error); 1920 } 1921