ip6_input.c revision 1.83
1 /* $NetBSD: ip6_input.c,v 1.83 2006/03/05 23:47:08 rpaulo Exp $ */ 2 /* $KAME: ip6_input.c,v 1.188 2001/03/29 05:34:31 itojun Exp $ */ 3 4 /* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* 34 * Copyright (c) 1982, 1986, 1988, 1993 35 * The Regents of the University of California. All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. Neither the name of the University nor the names of its contributors 46 * may be used to endorse or promote products derived from this software 47 * without specific prior written permission. 48 * 49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 59 * SUCH DAMAGE. 60 * 61 * @(#)ip_input.c 8.2 (Berkeley) 1/4/94 62 */ 63 64 #include <sys/cdefs.h> 65 __KERNEL_RCSID(0, "$NetBSD: ip6_input.c,v 1.83 2006/03/05 23:47:08 rpaulo Exp $"); 66 67 #include "opt_inet.h" 68 #include "opt_ipsec.h" 69 #include "opt_pfil_hooks.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/domain.h> 76 #include <sys/protosw.h> 77 #include <sys/socket.h> 78 #include <sys/socketvar.h> 79 #include <sys/errno.h> 80 #include <sys/time.h> 81 #include <sys/kernel.h> 82 #include <sys/syslog.h> 83 #include <sys/proc.h> 84 #include <sys/sysctl.h> 85 86 #include <net/if.h> 87 #include <net/if_types.h> 88 #include <net/if_dl.h> 89 #include <net/route.h> 90 #include <net/netisr.h> 91 #ifdef PFIL_HOOKS 92 #include <net/pfil.h> 93 #endif 94 95 #include <netinet/in.h> 96 #include <netinet/in_systm.h> 97 #ifdef INET 98 #include <netinet/ip.h> 99 #include <netinet/ip_icmp.h> 100 #endif /* INET */ 101 #include <netinet/ip6.h> 102 #include <netinet6/in6_var.h> 103 #include <netinet6/ip6_var.h> 104 #include <netinet6/in6_pcb.h> 105 #include <netinet/icmp6.h> 106 #include <netinet6/scope6_var.h> 107 #include <netinet6/in6_ifattach.h> 108 #include <netinet6/nd6.h> 109 110 #ifdef IPSEC 111 #include <netinet6/ipsec.h> 112 #endif 113 114 #include <netinet6/ip6protosw.h> 115 116 #include "faith.h" 117 #include "gif.h" 118 119 #if NGIF > 0 120 #include <netinet6/in6_gif.h> 121 #endif 122 123 #include <net/net_osdep.h> 124 125 extern struct domain inet6domain; 126 127 u_char ip6_protox[IPPROTO_MAX]; 128 static int ip6qmaxlen = IFQ_MAXLEN; 129 struct in6_ifaddr *in6_ifaddr; 130 struct ifqueue ip6intrq; 131 132 extern struct callout in6_tmpaddrtimer_ch; 133 134 int ip6_forward_srcrt; /* XXX */ 135 int ip6_sourcecheck; /* XXX */ 136 int ip6_sourcecheck_interval; /* XXX */ 137 138 #ifdef PFIL_HOOKS 139 struct pfil_head inet6_pfil_hook; 140 #endif 141 142 struct ip6stat ip6stat; 143 144 static void ip6_init2 __P((void *)); 145 static struct m_tag *ip6_setdstifaddr __P((struct mbuf *, struct in6_ifaddr *)); 146 147 static int ip6_hopopts_input __P((u_int32_t *, u_int32_t *, struct mbuf **, int *)); 148 static struct mbuf *ip6_pullexthdr __P((struct mbuf *, size_t, int)); 149 150 /* 151 * IP6 initialization: fill in IP6 protocol switch table. 152 * All protocols not implemented in kernel go to raw IP6 protocol handler. 153 */ 154 void 155 ip6_init() 156 { 157 const struct ip6protosw *pr; 158 int i; 159 160 pr = (const struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 161 if (pr == 0) 162 panic("ip6_init"); 163 for (i = 0; i < IPPROTO_MAX; i++) 164 ip6_protox[i] = pr - inet6sw; 165 for (pr = (const struct ip6protosw *)inet6domain.dom_protosw; 166 pr < (const struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++) 167 if (pr->pr_domain->dom_family == PF_INET6 && 168 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) 169 ip6_protox[pr->pr_protocol] = pr - inet6sw; 170 ip6intrq.ifq_maxlen = ip6qmaxlen; 171 scope6_init(); 172 addrsel_policy_init(); 173 nd6_init(); 174 frag6_init(); 175 ip6_desync_factor = arc4random() % MAX_TEMP_DESYNC_FACTOR; 176 177 ip6_init2((void *)0); 178 179 #ifdef PFIL_HOOKS 180 /* Register our Packet Filter hook. */ 181 inet6_pfil_hook.ph_type = PFIL_TYPE_AF; 182 inet6_pfil_hook.ph_af = AF_INET6; 183 i = pfil_head_register(&inet6_pfil_hook); 184 if (i != 0) 185 printf("ip6_init: WARNING: unable to register pfil hook, " 186 "error %d\n", i); 187 #endif /* PFIL_HOOKS */ 188 } 189 190 static void 191 ip6_init2(dummy) 192 void *dummy; 193 { 194 195 /* nd6_timer_init */ 196 callout_init(&nd6_timer_ch); 197 callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL); 198 199 /* timer for regeneranation of temporary addresses randomize ID */ 200 callout_init(&in6_tmpaddrtimer_ch); 201 callout_reset(&in6_tmpaddrtimer_ch, 202 (ip6_temp_preferred_lifetime - ip6_desync_factor - 203 ip6_temp_regen_advance) * hz, 204 in6_tmpaddrtimer, NULL); 205 } 206 207 /* 208 * IP6 input interrupt handling. Just pass the packet to ip6_input. 209 */ 210 void 211 ip6intr() 212 { 213 int s; 214 struct mbuf *m; 215 216 for (;;) { 217 s = splnet(); 218 IF_DEQUEUE(&ip6intrq, m); 219 splx(s); 220 if (m == 0) 221 return; 222 /* drop the packet if IPv6 operation is disabled on the IF */ 223 if ((ND_IFINFO(m->m_pkthdr.rcvif)->flags & ND6_IFF_IFDISABLED)) { 224 m_freem(m); 225 return; 226 } 227 ip6_input(m); 228 } 229 } 230 231 extern struct route_in6 ip6_forward_rt; 232 233 void 234 ip6_input(m) 235 struct mbuf *m; 236 { 237 struct ip6_hdr *ip6; 238 int off = sizeof(struct ip6_hdr), nest; 239 u_int32_t plen; 240 u_int32_t rtalert = ~0; 241 int nxt, ours = 0; 242 struct ifnet *deliverifp = NULL; 243 int srcrt = 0; 244 245 #ifdef IPSEC 246 /* 247 * should the inner packet be considered authentic? 248 * see comment in ah4_input(). 249 */ 250 m->m_flags &= ~M_AUTHIPHDR; 251 m->m_flags &= ~M_AUTHIPDGM; 252 #endif 253 254 /* 255 * make sure we don't have onion peering information into m_tag. 256 */ 257 ip6_delaux(m); 258 259 /* 260 * mbuf statistics 261 */ 262 if (m->m_flags & M_EXT) { 263 if (m->m_next) 264 ip6stat.ip6s_mext2m++; 265 else 266 ip6stat.ip6s_mext1++; 267 } else { 268 #define M2MMAX (sizeof(ip6stat.ip6s_m2m)/sizeof(ip6stat.ip6s_m2m[0])) 269 if (m->m_next) { 270 if (m->m_flags & M_LOOP) { 271 ip6stat.ip6s_m2m[lo0ifp->if_index]++; /* XXX */ 272 } else if (m->m_pkthdr.rcvif->if_index < M2MMAX) 273 ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++; 274 else 275 ip6stat.ip6s_m2m[0]++; 276 } else 277 ip6stat.ip6s_m1++; 278 #undef M2MMAX 279 } 280 281 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive); 282 ip6stat.ip6s_total++; 283 284 /* 285 * If the IPv6 header is not aligned, slurp it up into a new 286 * mbuf with space for link headers, in the event we forward 287 * it. Otherwise, if it is aligned, make sure the entire base 288 * IPv6 header is in the first mbuf of the chain. 289 */ 290 if (IP6_HDR_ALIGNED_P(mtod(m, caddr_t)) == 0) { 291 struct ifnet *inifp = m->m_pkthdr.rcvif; 292 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 293 (max_linkhdr + 3) & ~3)) == NULL) { 294 /* XXXJRT new stat, please */ 295 ip6stat.ip6s_toosmall++; 296 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 297 return; 298 } 299 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 300 struct ifnet *inifp = m->m_pkthdr.rcvif; 301 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 302 ip6stat.ip6s_toosmall++; 303 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 304 return; 305 } 306 } 307 308 ip6 = mtod(m, struct ip6_hdr *); 309 310 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 311 ip6stat.ip6s_badvers++; 312 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 313 goto bad; 314 } 315 316 #ifdef PFIL_HOOKS 317 /* 318 * Run through list of hooks for input packets. If there are any 319 * filters which require that additional packets in the flow are 320 * not fast-forwarded, they must clear the M_CANFASTFWD flag. 321 * Note that filters must _never_ set this flag, as another filter 322 * in the list may have previously cleared it. 323 */ 324 /* 325 * let ipfilter look at packet on the wire, 326 * not the decapsulated packet. 327 */ 328 #ifdef IPSEC 329 if (!ipsec_getnhist(m)) 330 #else 331 if (1) 332 #endif 333 { 334 struct in6_addr odst; 335 336 odst = ip6->ip6_dst; 337 if (pfil_run_hooks(&inet6_pfil_hook, &m, m->m_pkthdr.rcvif, 338 PFIL_IN) != 0) 339 return; 340 if (m == NULL) 341 return; 342 ip6 = mtod(m, struct ip6_hdr *); 343 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst); 344 } 345 #endif /* PFIL_HOOKS */ 346 347 ip6stat.ip6s_nxthist[ip6->ip6_nxt]++; 348 349 #ifdef ALTQ 350 if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) { 351 /* packet is dropped by traffic conditioner */ 352 return; 353 } 354 #endif 355 356 /* 357 * Check against address spoofing/corruption. 358 */ 359 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) || 360 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) { 361 /* 362 * XXX: "badscope" is not very suitable for a multicast source. 363 */ 364 ip6stat.ip6s_badscope++; 365 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 366 goto bad; 367 } 368 /* 369 * The following check is not documented in specs. A malicious 370 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack 371 * and bypass security checks (act as if it was from 127.0.0.1 by using 372 * IPv6 src ::ffff:127.0.0.1). Be cautious. 373 * 374 * This check chokes if we are in an SIIT cloud. As none of BSDs 375 * support IPv4-less kernel compilation, we cannot support SIIT 376 * environment at all. So, it makes more sense for us to reject any 377 * malicious packets for non-SIIT environment, than try to do a 378 * partial support for SIIT environment. 379 */ 380 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 381 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 382 ip6stat.ip6s_badscope++; 383 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 384 goto bad; 385 } 386 #if 0 387 /* 388 * Reject packets with IPv4 compatible addresses (auto tunnel). 389 * 390 * The code forbids auto tunnel relay case in RFC1933 (the check is 391 * stronger than RFC1933). We may want to re-enable it if mech-xx 392 * is revised to forbid relaying case. 393 */ 394 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) || 395 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) { 396 ip6stat.ip6s_badscope++; 397 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 398 goto bad; 399 } 400 #endif 401 402 /* 403 * Disambiguate address scope zones (if there is ambiguity). 404 * We first make sure that the original source or destination address 405 * is not in our internal form for scoped addresses. Such addresses 406 * are not necessarily invalid spec-wise, but we cannot accept them due 407 * to the usage conflict. 408 * in6_setscope() then also checks and rejects the cases where src or 409 * dst are the loopback address and the receiving interface 410 * is not loopback. 411 */ 412 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) { 413 ip6stat.ip6s_badscope++; /* XXX */ 414 goto bad; 415 } 416 if (in6_setscope(&ip6->ip6_src, m->m_pkthdr.rcvif, NULL) || 417 in6_setscope(&ip6->ip6_dst, m->m_pkthdr.rcvif, NULL)) { 418 ip6stat.ip6s_badscope++; 419 goto bad; 420 } 421 422 /* 423 * Multicast check 424 */ 425 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 426 struct in6_multi *in6m = 0; 427 428 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast); 429 /* 430 * See if we belong to the destination multicast group on the 431 * arrival interface. 432 */ 433 IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m); 434 if (in6m) 435 ours = 1; 436 else if (!ip6_mrouter) { 437 ip6stat.ip6s_notmember++; 438 ip6stat.ip6s_cantforward++; 439 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 440 goto bad; 441 } 442 deliverifp = m->m_pkthdr.rcvif; 443 goto hbhcheck; 444 } 445 446 /* 447 * Unicast check 448 */ 449 if (ip6_forward_rt.ro_rt != NULL && 450 (ip6_forward_rt.ro_rt->rt_flags & RTF_UP) != 0 && 451 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 452 &((struct sockaddr_in6 *)(&ip6_forward_rt.ro_dst))->sin6_addr)) 453 ip6stat.ip6s_forward_cachehit++; 454 else { 455 struct sockaddr_in6 *dst6; 456 457 if (ip6_forward_rt.ro_rt) { 458 /* route is down or destination is different */ 459 ip6stat.ip6s_forward_cachemiss++; 460 RTFREE(ip6_forward_rt.ro_rt); 461 ip6_forward_rt.ro_rt = 0; 462 } 463 464 bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6)); 465 dst6 = (struct sockaddr_in6 *)&ip6_forward_rt.ro_dst; 466 dst6->sin6_len = sizeof(struct sockaddr_in6); 467 dst6->sin6_family = AF_INET6; 468 dst6->sin6_addr = ip6->ip6_dst; 469 470 rtalloc((struct route *)&ip6_forward_rt); 471 } 472 473 #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key)) 474 475 /* 476 * Accept the packet if the forwarding interface to the destination 477 * according to the routing table is the loopback interface, 478 * unless the associated route has a gateway. 479 * Note that this approach causes to accept a packet if there is a 480 * route to the loopback interface for the destination of the packet. 481 * But we think it's even useful in some situations, e.g. when using 482 * a special daemon which wants to intercept the packet. 483 */ 484 if (ip6_forward_rt.ro_rt && 485 (ip6_forward_rt.ro_rt->rt_flags & 486 (RTF_HOST|RTF_GATEWAY)) == RTF_HOST && 487 !(ip6_forward_rt.ro_rt->rt_flags & RTF_CLONED) && 488 #if 0 489 /* 490 * The check below is redundant since the comparison of 491 * the destination and the key of the rtentry has 492 * already done through looking up the routing table. 493 */ 494 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 495 &rt6_key(ip6_forward_rt.ro_rt)->sin6_addr) && 496 #endif 497 ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) { 498 struct in6_ifaddr *ia6 = 499 (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa; 500 if (ia6->ia6_flags & IN6_IFF_ANYCAST) 501 m->m_flags |= M_ANYCAST6; 502 /* 503 * packets to a tentative, duplicated, or somehow invalid 504 * address must not be accepted. 505 */ 506 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) { 507 /* this address is ready */ 508 ours = 1; 509 deliverifp = ia6->ia_ifp; /* correct? */ 510 goto hbhcheck; 511 } else { 512 /* address is not ready, so discard the packet. */ 513 nd6log((LOG_INFO, 514 "ip6_input: packet to an unready address %s->%s\n", 515 ip6_sprintf(&ip6->ip6_src), 516 ip6_sprintf(&ip6->ip6_dst))); 517 518 goto bad; 519 } 520 } 521 522 /* 523 * FAITH (Firewall Aided Internet Translator) 524 */ 525 #if defined(NFAITH) && 0 < NFAITH 526 if (ip6_keepfaith) { 527 if (ip6_forward_rt.ro_rt && ip6_forward_rt.ro_rt->rt_ifp && 528 ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) { 529 /* XXX do we need more sanity checks? */ 530 ours = 1; 531 deliverifp = ip6_forward_rt.ro_rt->rt_ifp; /* faith */ 532 goto hbhcheck; 533 } 534 } 535 #endif 536 537 #if 0 538 { 539 /* 540 * Last resort: check in6_ifaddr for incoming interface. 541 * The code is here until I update the "goto ours hack" code above 542 * working right. 543 */ 544 struct ifaddr *ifa; 545 for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first; 546 ifa; 547 ifa = ifa->ifa_list.tqe_next) { 548 if (ifa->ifa_addr == NULL) 549 continue; /* just for safety */ 550 if (ifa->ifa_addr->sa_family != AF_INET6) 551 continue; 552 if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) { 553 ours = 1; 554 deliverifp = ifa->ifa_ifp; 555 goto hbhcheck; 556 } 557 } 558 } 559 #endif 560 561 /* 562 * Now there is no reason to process the packet if it's not our own 563 * and we're not a router. 564 */ 565 if (!ip6_forwarding) { 566 ip6stat.ip6s_cantforward++; 567 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 568 goto bad; 569 } 570 571 hbhcheck: 572 /* 573 * record address information into m_tag, if we don't have one yet. 574 * note that we are unable to record it, if the address is not listed 575 * as our interface address (e.g. multicast addresses, addresses 576 * within FAITH prefixes and such). 577 */ 578 if (deliverifp && !ip6_getdstifaddr(m)) { 579 struct in6_ifaddr *ia6; 580 581 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 582 if (ia6) { 583 if (!ip6_setdstifaddr(m, ia6)) { 584 /* 585 * XXX maybe we should drop the packet here, 586 * as we could not provide enough information 587 * to the upper layers. 588 */ 589 } 590 } 591 } 592 593 /* 594 * Process Hop-by-Hop options header if it's contained. 595 * m may be modified in ip6_hopopts_input(). 596 * If a JumboPayload option is included, plen will also be modified. 597 */ 598 plen = (u_int32_t)ntohs(ip6->ip6_plen); 599 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 600 struct ip6_hbh *hbh; 601 602 if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) { 603 #if 0 /*touches NULL pointer*/ 604 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 605 #endif 606 return; /* m have already been freed */ 607 } 608 609 /* adjust pointer */ 610 ip6 = mtod(m, struct ip6_hdr *); 611 612 /* 613 * if the payload length field is 0 and the next header field 614 * indicates Hop-by-Hop Options header, then a Jumbo Payload 615 * option MUST be included. 616 */ 617 if (ip6->ip6_plen == 0 && plen == 0) { 618 /* 619 * Note that if a valid jumbo payload option is 620 * contained, ip6_hopopts_input() must set a valid 621 * (non-zero) payload length to the variable plen. 622 */ 623 ip6stat.ip6s_badoptions++; 624 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 625 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 626 icmp6_error(m, ICMP6_PARAM_PROB, 627 ICMP6_PARAMPROB_HEADER, 628 (caddr_t)&ip6->ip6_plen - (caddr_t)ip6); 629 return; 630 } 631 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 632 sizeof(struct ip6_hbh)); 633 if (hbh == NULL) { 634 ip6stat.ip6s_tooshort++; 635 return; 636 } 637 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 638 nxt = hbh->ip6h_nxt; 639 640 /* 641 * accept the packet if a router alert option is included 642 * and we act as an IPv6 router. 643 */ 644 if (rtalert != ~0 && ip6_forwarding) 645 ours = 1; 646 } else 647 nxt = ip6->ip6_nxt; 648 649 /* 650 * Check that the amount of data in the buffers 651 * is as at least much as the IPv6 header would have us expect. 652 * Trim mbufs if longer than we expect. 653 * Drop packet if shorter than we expect. 654 */ 655 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 656 ip6stat.ip6s_tooshort++; 657 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 658 goto bad; 659 } 660 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 661 if (m->m_len == m->m_pkthdr.len) { 662 m->m_len = sizeof(struct ip6_hdr) + plen; 663 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 664 } else 665 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 666 } 667 668 /* 669 * Forward if desirable. 670 */ 671 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 672 /* 673 * If we are acting as a multicast router, all 674 * incoming multicast packets are passed to the 675 * kernel-level multicast forwarding function. 676 * The packet is returned (relatively) intact; if 677 * ip6_mforward() returns a non-zero value, the packet 678 * must be discarded, else it may be accepted below. 679 */ 680 if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) { 681 ip6stat.ip6s_cantforward++; 682 m_freem(m); 683 return; 684 } 685 if (!ours) { 686 m_freem(m); 687 return; 688 } 689 } else if (!ours) { 690 ip6_forward(m, srcrt); 691 return; 692 } 693 694 ip6 = mtod(m, struct ip6_hdr *); 695 696 /* 697 * Malicious party may be able to use IPv4 mapped addr to confuse 698 * tcp/udp stack and bypass security checks (act as if it was from 699 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious. 700 * 701 * For SIIT end node behavior, you may want to disable the check. 702 * However, you will become vulnerable to attacks using IPv4 mapped 703 * source. 704 */ 705 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 706 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 707 ip6stat.ip6s_badscope++; 708 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 709 goto bad; 710 } 711 712 /* 713 * Tell launch routine the next header 714 */ 715 #ifdef IFA_STATS 716 if (deliverifp != NULL) { 717 struct in6_ifaddr *ia6; 718 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 719 if (ia6) 720 ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len; 721 } 722 #endif 723 ip6stat.ip6s_delivered++; 724 in6_ifstat_inc(deliverifp, ifs6_in_deliver); 725 nest = 0; 726 727 while (nxt != IPPROTO_DONE) { 728 if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) { 729 ip6stat.ip6s_toomanyhdr++; 730 goto bad; 731 } 732 733 /* 734 * protection against faulty packet - there should be 735 * more sanity checks in header chain processing. 736 */ 737 if (m->m_pkthdr.len < off) { 738 ip6stat.ip6s_tooshort++; 739 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 740 goto bad; 741 } 742 743 #ifdef IPSEC 744 /* 745 * enforce IPsec policy checking if we are seeing last header. 746 * note that we do not visit this with protocols with pcb layer 747 * code - like udp/tcp/raw ip. 748 */ 749 if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 && 750 ipsec6_in_reject(m, NULL)) { 751 ipsec6stat.in_polvio++; 752 goto bad; 753 } 754 #endif 755 756 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt); 757 } 758 return; 759 bad: 760 m_freem(m); 761 } 762 763 /* 764 * set/grab in6_ifaddr correspond to IPv6 destination address. 765 */ 766 static struct m_tag * 767 ip6_setdstifaddr(m, ia6) 768 struct mbuf *m; 769 struct in6_ifaddr *ia6; 770 { 771 struct m_tag *mtag; 772 773 mtag = ip6_addaux(m); 774 if (mtag) 775 ((struct ip6aux *)(mtag + 1))->ip6a_dstia6 = ia6; 776 return mtag; /* NULL if failed to set */ 777 } 778 779 struct in6_ifaddr * 780 ip6_getdstifaddr(m) 781 struct mbuf *m; 782 { 783 struct m_tag *mtag; 784 785 mtag = ip6_findaux(m); 786 if (mtag) 787 return ((struct ip6aux *)(mtag + 1))->ip6a_dstia6; 788 else 789 return NULL; 790 } 791 792 /* 793 * Hop-by-Hop options header processing. If a valid jumbo payload option is 794 * included, the real payload length will be stored in plenp. 795 */ 796 static int 797 ip6_hopopts_input(plenp, rtalertp, mp, offp) 798 u_int32_t *plenp; 799 u_int32_t *rtalertp; /* XXX: should be stored more smart way */ 800 struct mbuf **mp; 801 int *offp; 802 { 803 struct mbuf *m = *mp; 804 int off = *offp, hbhlen; 805 struct ip6_hbh *hbh; 806 807 /* validation of the length of the header */ 808 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, 809 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh)); 810 if (hbh == NULL) { 811 ip6stat.ip6s_tooshort++; 812 return -1; 813 } 814 hbhlen = (hbh->ip6h_len + 1) << 3; 815 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 816 hbhlen); 817 if (hbh == NULL) { 818 ip6stat.ip6s_tooshort++; 819 return -1; 820 } 821 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 822 off += hbhlen; 823 hbhlen -= sizeof(struct ip6_hbh); 824 825 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 826 hbhlen, rtalertp, plenp) < 0) 827 return (-1); 828 829 *offp = off; 830 *mp = m; 831 return (0); 832 } 833 834 /* 835 * Search header for all Hop-by-hop options and process each option. 836 * This function is separate from ip6_hopopts_input() in order to 837 * handle a case where the sending node itself process its hop-by-hop 838 * options header. In such a case, the function is called from ip6_output(). 839 * 840 * The function assumes that hbh header is located right after the IPv6 header 841 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to 842 * opthead + hbhlen is located in continuous memory region. 843 */ 844 int 845 ip6_process_hopopts(m, opthead, hbhlen, rtalertp, plenp) 846 struct mbuf *m; 847 u_int8_t *opthead; 848 int hbhlen; 849 u_int32_t *rtalertp; 850 u_int32_t *plenp; 851 { 852 struct ip6_hdr *ip6; 853 int optlen = 0; 854 u_int8_t *opt = opthead; 855 u_int16_t rtalert_val; 856 u_int32_t jumboplen; 857 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh); 858 859 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 860 switch (*opt) { 861 case IP6OPT_PAD1: 862 optlen = 1; 863 break; 864 case IP6OPT_PADN: 865 if (hbhlen < IP6OPT_MINLEN) { 866 ip6stat.ip6s_toosmall++; 867 goto bad; 868 } 869 optlen = *(opt + 1) + 2; 870 break; 871 case IP6OPT_RTALERT: 872 /* XXX may need check for alignment */ 873 if (hbhlen < IP6OPT_RTALERT_LEN) { 874 ip6stat.ip6s_toosmall++; 875 goto bad; 876 } 877 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) { 878 /* XXX stat */ 879 icmp6_error(m, ICMP6_PARAM_PROB, 880 ICMP6_PARAMPROB_HEADER, 881 erroff + opt + 1 - opthead); 882 return (-1); 883 } 884 optlen = IP6OPT_RTALERT_LEN; 885 bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2); 886 *rtalertp = ntohs(rtalert_val); 887 break; 888 case IP6OPT_JUMBO: 889 /* XXX may need check for alignment */ 890 if (hbhlen < IP6OPT_JUMBO_LEN) { 891 ip6stat.ip6s_toosmall++; 892 goto bad; 893 } 894 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) { 895 /* XXX stat */ 896 icmp6_error(m, ICMP6_PARAM_PROB, 897 ICMP6_PARAMPROB_HEADER, 898 erroff + opt + 1 - opthead); 899 return (-1); 900 } 901 optlen = IP6OPT_JUMBO_LEN; 902 903 /* 904 * IPv6 packets that have non 0 payload length 905 * must not contain a jumbo payload option. 906 */ 907 ip6 = mtod(m, struct ip6_hdr *); 908 if (ip6->ip6_plen) { 909 ip6stat.ip6s_badoptions++; 910 icmp6_error(m, ICMP6_PARAM_PROB, 911 ICMP6_PARAMPROB_HEADER, 912 erroff + opt - opthead); 913 return (-1); 914 } 915 916 /* 917 * We may see jumbolen in unaligned location, so 918 * we'd need to perform bcopy(). 919 */ 920 bcopy(opt + 2, &jumboplen, sizeof(jumboplen)); 921 jumboplen = (u_int32_t)htonl(jumboplen); 922 923 #if 1 924 /* 925 * if there are multiple jumbo payload options, 926 * *plenp will be non-zero and the packet will be 927 * rejected. 928 * the behavior may need some debate in ipngwg - 929 * multiple options does not make sense, however, 930 * there's no explicit mention in specification. 931 */ 932 if (*plenp != 0) { 933 ip6stat.ip6s_badoptions++; 934 icmp6_error(m, ICMP6_PARAM_PROB, 935 ICMP6_PARAMPROB_HEADER, 936 erroff + opt + 2 - opthead); 937 return (-1); 938 } 939 #endif 940 941 /* 942 * jumbo payload length must be larger than 65535. 943 */ 944 if (jumboplen <= IPV6_MAXPACKET) { 945 ip6stat.ip6s_badoptions++; 946 icmp6_error(m, ICMP6_PARAM_PROB, 947 ICMP6_PARAMPROB_HEADER, 948 erroff + opt + 2 - opthead); 949 return (-1); 950 } 951 *plenp = jumboplen; 952 953 break; 954 default: /* unknown option */ 955 if (hbhlen < IP6OPT_MINLEN) { 956 ip6stat.ip6s_toosmall++; 957 goto bad; 958 } 959 optlen = ip6_unknown_opt(opt, m, 960 erroff + opt - opthead); 961 if (optlen == -1) 962 return (-1); 963 optlen += 2; 964 break; 965 } 966 } 967 968 return (0); 969 970 bad: 971 m_freem(m); 972 return (-1); 973 } 974 975 /* 976 * Unknown option processing. 977 * The third argument `off' is the offset from the IPv6 header to the option, 978 * which is necessary if the IPv6 header the and option header and IPv6 header 979 * is not continuous in order to return an ICMPv6 error. 980 */ 981 int 982 ip6_unknown_opt(optp, m, off) 983 u_int8_t *optp; 984 struct mbuf *m; 985 int off; 986 { 987 struct ip6_hdr *ip6; 988 989 switch (IP6OPT_TYPE(*optp)) { 990 case IP6OPT_TYPE_SKIP: /* ignore the option */ 991 return ((int)*(optp + 1)); 992 case IP6OPT_TYPE_DISCARD: /* silently discard */ 993 m_freem(m); 994 return (-1); 995 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 996 ip6stat.ip6s_badoptions++; 997 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 998 return (-1); 999 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 1000 ip6stat.ip6s_badoptions++; 1001 ip6 = mtod(m, struct ip6_hdr *); 1002 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 1003 (m->m_flags & (M_BCAST|M_MCAST))) 1004 m_freem(m); 1005 else 1006 icmp6_error(m, ICMP6_PARAM_PROB, 1007 ICMP6_PARAMPROB_OPTION, off); 1008 return (-1); 1009 } 1010 1011 m_freem(m); /* XXX: NOTREACHED */ 1012 return (-1); 1013 } 1014 1015 /* 1016 * Create the "control" list for this pcb. 1017 * 1018 * The routine will be called from upper layer handlers like tcp6_input(). 1019 * Thus the routine assumes that the caller (tcp6_input) have already 1020 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the 1021 * very first mbuf on the mbuf chain. 1022 * We may want to add some infinite loop prevention or sanity checks for safety. 1023 * (This applies only when you are using KAME mbuf chain restriction, i.e. 1024 * you are using IP6_EXTHDR_CHECK() not m_pulldown()) 1025 */ 1026 void 1027 ip6_savecontrol(in6p, mp, ip6, m) 1028 struct in6pcb *in6p; 1029 struct mbuf **mp; 1030 struct ip6_hdr *ip6; 1031 struct mbuf *m; 1032 { 1033 1034 #ifdef SO_TIMESTAMP 1035 if (in6p->in6p_socket->so_options & SO_TIMESTAMP) { 1036 struct timeval tv; 1037 1038 microtime(&tv); 1039 *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv), 1040 SCM_TIMESTAMP, SOL_SOCKET); 1041 if (*mp) 1042 mp = &(*mp)->m_next; 1043 } 1044 #endif 1045 if (in6p->in6p_flags & IN6P_RECVDSTADDR) { 1046 *mp = sbcreatecontrol((caddr_t) &ip6->ip6_dst, 1047 sizeof(struct in6_addr), IPV6_RECVDSTADDR, IPPROTO_IPV6); 1048 if (*mp) 1049 mp = &(*mp)->m_next; 1050 } 1051 1052 #ifdef noyet 1053 /* options were tossed above */ 1054 if (in6p->in6p_flags & IN6P_RECVOPTS) 1055 /* broken */ 1056 /* ip6_srcroute doesn't do what we want here, need to fix */ 1057 if (in6p->in6p_flags & IPV6P_RECVRETOPTS) 1058 /* broken */ 1059 #endif 1060 1061 /* RFC 2292 sec. 5 */ 1062 if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) { 1063 struct in6_pktinfo pi6; 1064 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr)); 1065 in6_clearscope(&pi6.ipi6_addr); /* XXX */ 1066 pi6.ipi6_ifindex = (m && m->m_pkthdr.rcvif) 1067 ? m->m_pkthdr.rcvif->if_index 1068 : 0; 1069 *mp = sbcreatecontrol((caddr_t) &pi6, 1070 sizeof(struct in6_pktinfo), IPV6_PKTINFO, IPPROTO_IPV6); 1071 if (*mp) 1072 mp = &(*mp)->m_next; 1073 } 1074 if (in6p->in6p_flags & IN6P_HOPLIMIT) { 1075 int hlim = ip6->ip6_hlim & 0xff; 1076 *mp = sbcreatecontrol((caddr_t) &hlim, sizeof(int), 1077 IPV6_HOPLIMIT, IPPROTO_IPV6); 1078 if (*mp) 1079 mp = &(*mp)->m_next; 1080 } 1081 /* IN6P_NEXTHOP - for outgoing packet only */ 1082 1083 /* 1084 * IPV6_HOPOPTS socket option. Recall that we required super-user 1085 * privilege for the option (see ip6_ctloutput), but it might be too 1086 * strict, since there might be some hop-by-hop options which can be 1087 * returned to normal user. 1088 * See also RFC 2292 section 6. 1089 */ 1090 if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0) { 1091 /* 1092 * Check if a hop-by-hop options header is contatined in the 1093 * received packet, and if so, store the options as ancillary 1094 * data. Note that a hop-by-hop options header must be 1095 * just after the IPv6 header, which fact is assured through 1096 * the IPv6 input processing. 1097 */ 1098 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1099 if (xip6->ip6_nxt == IPPROTO_HOPOPTS) { 1100 struct ip6_hbh *hbh; 1101 int hbhlen; 1102 struct mbuf *ext; 1103 1104 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr), 1105 xip6->ip6_nxt); 1106 if (ext == NULL) { 1107 ip6stat.ip6s_tooshort++; 1108 return; 1109 } 1110 hbh = mtod(ext, struct ip6_hbh *); 1111 hbhlen = (hbh->ip6h_len + 1) << 3; 1112 if (hbhlen != ext->m_len) { 1113 m_freem(ext); 1114 ip6stat.ip6s_tooshort++; 1115 return; 1116 } 1117 1118 /* 1119 * XXX: We copy whole the header even if a jumbo 1120 * payload option is included, which option is to 1121 * be removed before returning in the RFC 2292. 1122 * But it's too painful operation... 1123 */ 1124 *mp = sbcreatecontrol((caddr_t)hbh, hbhlen, 1125 IPV6_HOPOPTS, IPPROTO_IPV6); 1126 if (*mp) 1127 mp = &(*mp)->m_next; 1128 m_freem(ext); 1129 } 1130 } 1131 1132 /* IPV6_DSTOPTS and IPV6_RTHDR socket options */ 1133 if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) { 1134 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1135 int nxt = xip6->ip6_nxt, off = sizeof(struct ip6_hdr); 1136 1137 /* 1138 * Search for destination options headers or routing 1139 * header(s) through the header chain, and stores each 1140 * header as ancillary data. 1141 * Note that the order of the headers remains in 1142 * the chain of ancillary data. 1143 */ 1144 while (1) { /* is explicit loop prevention necessary? */ 1145 struct ip6_ext *ip6e = NULL; 1146 int elen; 1147 struct mbuf *ext = NULL; 1148 1149 /* 1150 * if it is not an extension header, don't try to 1151 * pull it from the chain. 1152 */ 1153 switch (nxt) { 1154 case IPPROTO_DSTOPTS: 1155 case IPPROTO_ROUTING: 1156 case IPPROTO_HOPOPTS: 1157 case IPPROTO_AH: /* is it possible? */ 1158 break; 1159 default: 1160 goto loopend; 1161 } 1162 1163 ext = ip6_pullexthdr(m, off, nxt); 1164 if (ext == NULL) { 1165 ip6stat.ip6s_tooshort++; 1166 return; 1167 } 1168 ip6e = mtod(ext, struct ip6_ext *); 1169 if (nxt == IPPROTO_AH) 1170 elen = (ip6e->ip6e_len + 2) << 2; 1171 else 1172 elen = (ip6e->ip6e_len + 1) << 3; 1173 if (elen != ext->m_len) { 1174 m_freem(ext); 1175 ip6stat.ip6s_tooshort++; 1176 return; 1177 } 1178 KASSERT(IP6_HDR_ALIGNED_P(ip6e)); 1179 1180 switch (nxt) { 1181 case IPPROTO_DSTOPTS: 1182 if (!in6p->in6p_flags & IN6P_DSTOPTS) 1183 break; 1184 1185 *mp = sbcreatecontrol((caddr_t)ip6e, elen, 1186 IPV6_DSTOPTS, IPPROTO_IPV6); 1187 if (*mp) 1188 mp = &(*mp)->m_next; 1189 break; 1190 1191 case IPPROTO_ROUTING: 1192 if (!in6p->in6p_flags & IN6P_RTHDR) 1193 break; 1194 1195 *mp = sbcreatecontrol((caddr_t)ip6e, elen, 1196 IPV6_RTHDR, IPPROTO_IPV6); 1197 if (*mp) 1198 mp = &(*mp)->m_next; 1199 break; 1200 1201 case IPPROTO_HOPOPTS: 1202 case IPPROTO_AH: /* is it possible? */ 1203 break; 1204 1205 default: 1206 /* 1207 * other cases have been filtered in the above. 1208 * none will visit this case. here we supply 1209 * the code just in case (nxt overwritten or 1210 * other cases). 1211 */ 1212 m_freem(ext); 1213 goto loopend; 1214 1215 } 1216 1217 /* proceed with the next header. */ 1218 off += elen; 1219 nxt = ip6e->ip6e_nxt; 1220 ip6e = NULL; 1221 m_freem(ext); 1222 ext = NULL; 1223 } 1224 loopend: 1225 ; 1226 } 1227 } 1228 1229 /* 1230 * pull single extension header from mbuf chain. returns single mbuf that 1231 * contains the result, or NULL on error. 1232 */ 1233 static struct mbuf * 1234 ip6_pullexthdr(m, off, nxt) 1235 struct mbuf *m; 1236 size_t off; 1237 int nxt; 1238 { 1239 struct ip6_ext ip6e; 1240 size_t elen; 1241 struct mbuf *n; 1242 1243 #ifdef DIAGNOSTIC 1244 switch (nxt) { 1245 case IPPROTO_DSTOPTS: 1246 case IPPROTO_ROUTING: 1247 case IPPROTO_HOPOPTS: 1248 case IPPROTO_AH: /* is it possible? */ 1249 break; 1250 default: 1251 printf("ip6_pullexthdr: invalid nxt=%d\n", nxt); 1252 } 1253 #endif 1254 1255 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1256 if (nxt == IPPROTO_AH) 1257 elen = (ip6e.ip6e_len + 2) << 2; 1258 else 1259 elen = (ip6e.ip6e_len + 1) << 3; 1260 1261 MGET(n, M_DONTWAIT, MT_DATA); 1262 if (n && elen >= MLEN) { 1263 MCLGET(n, M_DONTWAIT); 1264 if ((n->m_flags & M_EXT) == 0) { 1265 m_free(n); 1266 n = NULL; 1267 } 1268 } 1269 if (!n) 1270 return NULL; 1271 1272 n->m_len = 0; 1273 if (elen >= M_TRAILINGSPACE(n)) { 1274 m_free(n); 1275 return NULL; 1276 } 1277 1278 m_copydata(m, off, elen, mtod(n, caddr_t)); 1279 n->m_len = elen; 1280 return n; 1281 } 1282 1283 /* 1284 * Get pointer to the previous header followed by the header 1285 * currently processed. 1286 * XXX: This function supposes that 1287 * M includes all headers, 1288 * the next header field and the header length field of each header 1289 * are valid, and 1290 * the sum of each header length equals to OFF. 1291 * Because of these assumptions, this function must be called very 1292 * carefully. Moreover, it will not be used in the near future when 1293 * we develop `neater' mechanism to process extension headers. 1294 */ 1295 u_int8_t * 1296 ip6_get_prevhdr(m, off) 1297 struct mbuf *m; 1298 int off; 1299 { 1300 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1301 1302 if (off == sizeof(struct ip6_hdr)) 1303 return (&ip6->ip6_nxt); 1304 else { 1305 int len, nxt; 1306 struct ip6_ext *ip6e = NULL; 1307 1308 nxt = ip6->ip6_nxt; 1309 len = sizeof(struct ip6_hdr); 1310 while (len < off) { 1311 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len); 1312 1313 switch (nxt) { 1314 case IPPROTO_FRAGMENT: 1315 len += sizeof(struct ip6_frag); 1316 break; 1317 case IPPROTO_AH: 1318 len += (ip6e->ip6e_len + 2) << 2; 1319 break; 1320 default: 1321 len += (ip6e->ip6e_len + 1) << 3; 1322 break; 1323 } 1324 nxt = ip6e->ip6e_nxt; 1325 } 1326 if (ip6e) 1327 return (&ip6e->ip6e_nxt); 1328 else 1329 return NULL; 1330 } 1331 } 1332 1333 /* 1334 * get next header offset. m will be retained. 1335 */ 1336 int 1337 ip6_nexthdr(m, off, proto, nxtp) 1338 struct mbuf *m; 1339 int off; 1340 int proto; 1341 int *nxtp; 1342 { 1343 struct ip6_hdr ip6; 1344 struct ip6_ext ip6e; 1345 struct ip6_frag fh; 1346 1347 /* just in case */ 1348 if (m == NULL) 1349 panic("ip6_nexthdr: m == NULL"); 1350 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off) 1351 return -1; 1352 1353 switch (proto) { 1354 case IPPROTO_IPV6: 1355 /* do not chase beyond intermediate IPv6 headers */ 1356 if (off != 0) 1357 return -1; 1358 if (m->m_pkthdr.len < off + sizeof(ip6)) 1359 return -1; 1360 m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6); 1361 if (nxtp) 1362 *nxtp = ip6.ip6_nxt; 1363 off += sizeof(ip6); 1364 return off; 1365 1366 case IPPROTO_FRAGMENT: 1367 /* 1368 * terminate parsing if it is not the first fragment, 1369 * it does not make sense to parse through it. 1370 */ 1371 if (m->m_pkthdr.len < off + sizeof(fh)) 1372 return -1; 1373 m_copydata(m, off, sizeof(fh), (caddr_t)&fh); 1374 if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0) 1375 return -1; 1376 if (nxtp) 1377 *nxtp = fh.ip6f_nxt; 1378 off += sizeof(struct ip6_frag); 1379 return off; 1380 1381 case IPPROTO_AH: 1382 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1383 return -1; 1384 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1385 if (nxtp) 1386 *nxtp = ip6e.ip6e_nxt; 1387 off += (ip6e.ip6e_len + 2) << 2; 1388 if (m->m_pkthdr.len < off) 1389 return -1; 1390 return off; 1391 1392 case IPPROTO_HOPOPTS: 1393 case IPPROTO_ROUTING: 1394 case IPPROTO_DSTOPTS: 1395 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1396 return -1; 1397 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1398 if (nxtp) 1399 *nxtp = ip6e.ip6e_nxt; 1400 off += (ip6e.ip6e_len + 1) << 3; 1401 if (m->m_pkthdr.len < off) 1402 return -1; 1403 return off; 1404 1405 case IPPROTO_NONE: 1406 case IPPROTO_ESP: 1407 case IPPROTO_IPCOMP: 1408 /* give up */ 1409 return -1; 1410 1411 default: 1412 return -1; 1413 } 1414 } 1415 1416 /* 1417 * get offset for the last header in the chain. m will be kept untainted. 1418 */ 1419 int 1420 ip6_lasthdr(m, off, proto, nxtp) 1421 struct mbuf *m; 1422 int off; 1423 int proto; 1424 int *nxtp; 1425 { 1426 int newoff; 1427 int nxt; 1428 1429 if (!nxtp) { 1430 nxt = -1; 1431 nxtp = &nxt; 1432 } 1433 while (1) { 1434 newoff = ip6_nexthdr(m, off, proto, nxtp); 1435 if (newoff < 0) 1436 return off; 1437 else if (newoff < off) 1438 return -1; /* invalid */ 1439 else if (newoff == off) 1440 return newoff; 1441 1442 off = newoff; 1443 proto = *nxtp; 1444 } 1445 } 1446 1447 struct m_tag * 1448 ip6_addaux(m) 1449 struct mbuf *m; 1450 { 1451 struct m_tag *mtag; 1452 1453 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1454 if (!mtag) { 1455 mtag = m_tag_get(PACKET_TAG_INET6, sizeof(struct ip6aux), 1456 M_NOWAIT); 1457 if (mtag) { 1458 m_tag_prepend(m, mtag); 1459 bzero(mtag + 1, sizeof(struct ip6aux)); 1460 } 1461 } 1462 return mtag; 1463 } 1464 1465 struct m_tag * 1466 ip6_findaux(m) 1467 struct mbuf *m; 1468 { 1469 struct m_tag *mtag; 1470 1471 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1472 return mtag; 1473 } 1474 1475 void 1476 ip6_delaux(m) 1477 struct mbuf *m; 1478 { 1479 struct m_tag *mtag; 1480 1481 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1482 if (mtag) 1483 m_tag_delete(m, mtag); 1484 } 1485 1486 /* 1487 * System control for IP6 1488 */ 1489 1490 u_char inet6ctlerrmap[PRC_NCMDS] = { 1491 0, 0, 0, 0, 1492 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 1493 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 1494 EMSGSIZE, EHOSTUNREACH, 0, 0, 1495 0, 0, 0, 0, 1496 ENOPROTOOPT 1497 }; 1498 1499 SYSCTL_SETUP(sysctl_net_inet6_ip6_setup, "sysctl net.inet6.ip6 subtree setup") 1500 { 1501 1502 sysctl_createv(clog, 0, NULL, NULL, 1503 CTLFLAG_PERMANENT, 1504 CTLTYPE_NODE, "net", NULL, 1505 NULL, 0, NULL, 0, 1506 CTL_NET, CTL_EOL); 1507 sysctl_createv(clog, 0, NULL, NULL, 1508 CTLFLAG_PERMANENT, 1509 CTLTYPE_NODE, "inet6", 1510 SYSCTL_DESCR("PF_INET6 related settings"), 1511 NULL, 0, NULL, 0, 1512 CTL_NET, PF_INET6, CTL_EOL); 1513 sysctl_createv(clog, 0, NULL, NULL, 1514 CTLFLAG_PERMANENT, 1515 CTLTYPE_NODE, "ip6", 1516 SYSCTL_DESCR("IPv6 related settings"), 1517 NULL, 0, NULL, 0, 1518 CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_EOL); 1519 1520 sysctl_createv(clog, 0, NULL, NULL, 1521 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1522 CTLTYPE_INT, "forwarding", 1523 SYSCTL_DESCR("Enable forwarding of INET6 datagrams"), 1524 NULL, 0, &ip6_forwarding, 0, 1525 CTL_NET, PF_INET6, IPPROTO_IPV6, 1526 IPV6CTL_FORWARDING, CTL_EOL); 1527 sysctl_createv(clog, 0, NULL, NULL, 1528 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1529 CTLTYPE_INT, "redirect", 1530 SYSCTL_DESCR("Enable sending of ICMPv6 redirect messages"), 1531 NULL, 0, &ip6_sendredirects, 0, 1532 CTL_NET, PF_INET6, IPPROTO_IPV6, 1533 IPV6CTL_SENDREDIRECTS, CTL_EOL); 1534 sysctl_createv(clog, 0, NULL, NULL, 1535 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1536 CTLTYPE_INT, "hlim", 1537 SYSCTL_DESCR("Hop limit for an INET6 datagram"), 1538 NULL, 0, &ip6_defhlim, 0, 1539 CTL_NET, PF_INET6, IPPROTO_IPV6, 1540 IPV6CTL_DEFHLIM, CTL_EOL); 1541 #ifdef notyet 1542 sysctl_createv(clog, 0, NULL, NULL, 1543 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1544 CTLTYPE_INT, "mtu", NULL, 1545 NULL, 0, &, 0, 1546 CTL_NET, PF_INET6, IPPROTO_IPV6, 1547 IPV6CTL_DEFMTU, CTL_EOL); 1548 #endif 1549 #ifdef __no_idea__ 1550 sysctl_createv(clog, 0, NULL, NULL, 1551 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1552 CTLTYPE_INT, "forwsrcrt", NULL, 1553 NULL, 0, &?, 0, 1554 CTL_NET, PF_INET6, IPPROTO_IPV6, 1555 IPV6CTL_FORWSRCRT, CTL_EOL); 1556 sysctl_createv(clog, 0, NULL, NULL, 1557 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1558 CTLTYPE_STRUCT, "mrtstats", NULL, 1559 NULL, 0, &?, sizeof(?), 1560 CTL_NET, PF_INET6, IPPROTO_IPV6, 1561 IPV6CTL_MRTSTATS, CTL_EOL); 1562 sysctl_createv(clog, 0, NULL, NULL, 1563 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1564 CTLTYPE_?, "mrtproto", NULL, 1565 NULL, 0, &?, sizeof(?), 1566 CTL_NET, PF_INET6, IPPROTO_IPV6, 1567 IPV6CTL_MRTPROTO, CTL_EOL); 1568 #endif 1569 sysctl_createv(clog, 0, NULL, NULL, 1570 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1571 CTLTYPE_INT, "maxfragpackets", 1572 SYSCTL_DESCR("Maximum number of fragments to buffer " 1573 "for reassembly"), 1574 NULL, 0, &ip6_maxfragpackets, 0, 1575 CTL_NET, PF_INET6, IPPROTO_IPV6, 1576 IPV6CTL_MAXFRAGPACKETS, CTL_EOL); 1577 #ifdef __no_idea__ 1578 sysctl_createv(clog, 0, NULL, NULL, 1579 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1580 CTLTYPE_INT, "sourcecheck", NULL, 1581 NULL, 0, &?, 0, 1582 CTL_NET, PF_INET6, IPPROTO_IPV6, 1583 IPV6CTL_SOURCECHECK, CTL_EOL); 1584 sysctl_createv(clog, 0, NULL, NULL, 1585 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1586 CTLTYPE_INT, "sourcecheck_logint", NULL, 1587 NULL, 0, &?, 0, 1588 CTL_NET, PF_INET6, IPPROTO_IPV6, 1589 IPV6CTL_SOURCECHECK_LOGINT, CTL_EOL); 1590 #endif 1591 sysctl_createv(clog, 0, NULL, NULL, 1592 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1593 CTLTYPE_INT, "accept_rtadv", 1594 SYSCTL_DESCR("Accept router advertisements"), 1595 NULL, 0, &ip6_accept_rtadv, 0, 1596 CTL_NET, PF_INET6, IPPROTO_IPV6, 1597 IPV6CTL_ACCEPT_RTADV, CTL_EOL); 1598 sysctl_createv(clog, 0, NULL, NULL, 1599 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1600 CTLTYPE_INT, "keepfaith", 1601 SYSCTL_DESCR("Activate faith interface"), 1602 NULL, 0, &ip6_keepfaith, 0, 1603 CTL_NET, PF_INET6, IPPROTO_IPV6, 1604 IPV6CTL_KEEPFAITH, CTL_EOL); 1605 sysctl_createv(clog, 0, NULL, NULL, 1606 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1607 CTLTYPE_INT, "log_interval", 1608 SYSCTL_DESCR("Minumum interval between logging " 1609 "unroutable packets"), 1610 NULL, 0, &ip6_log_interval, 0, 1611 CTL_NET, PF_INET6, IPPROTO_IPV6, 1612 IPV6CTL_LOG_INTERVAL, CTL_EOL); 1613 sysctl_createv(clog, 0, NULL, NULL, 1614 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1615 CTLTYPE_INT, "hdrnestlimit", 1616 SYSCTL_DESCR("Maximum number of nested IPv6 headers"), 1617 NULL, 0, &ip6_hdrnestlimit, 0, 1618 CTL_NET, PF_INET6, IPPROTO_IPV6, 1619 IPV6CTL_HDRNESTLIMIT, CTL_EOL); 1620 sysctl_createv(clog, 0, NULL, NULL, 1621 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1622 CTLTYPE_INT, "dad_count", 1623 SYSCTL_DESCR("Number of Duplicate Address Detection " 1624 "probes to send"), 1625 NULL, 0, &ip6_dad_count, 0, 1626 CTL_NET, PF_INET6, IPPROTO_IPV6, 1627 IPV6CTL_DAD_COUNT, CTL_EOL); 1628 sysctl_createv(clog, 0, NULL, NULL, 1629 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1630 CTLTYPE_INT, "auto_flowlabel", 1631 SYSCTL_DESCR("Assign random IPv6 flow labels"), 1632 NULL, 0, &ip6_auto_flowlabel, 0, 1633 CTL_NET, PF_INET6, IPPROTO_IPV6, 1634 IPV6CTL_AUTO_FLOWLABEL, CTL_EOL); 1635 sysctl_createv(clog, 0, NULL, NULL, 1636 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1637 CTLTYPE_INT, "defmcasthlim", 1638 SYSCTL_DESCR("Default multicast hop limit"), 1639 NULL, 0, &ip6_defmcasthlim, 0, 1640 CTL_NET, PF_INET6, IPPROTO_IPV6, 1641 IPV6CTL_DEFMCASTHLIM, CTL_EOL); 1642 #if NGIF > 0 1643 sysctl_createv(clog, 0, NULL, NULL, 1644 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1645 CTLTYPE_INT, "gifhlim", 1646 SYSCTL_DESCR("Default hop limit for a gif tunnel datagram"), 1647 NULL, 0, &ip6_gif_hlim, 0, 1648 CTL_NET, PF_INET6, IPPROTO_IPV6, 1649 IPV6CTL_GIF_HLIM, CTL_EOL); 1650 #endif /* NGIF */ 1651 sysctl_createv(clog, 0, NULL, NULL, 1652 CTLFLAG_PERMANENT, 1653 CTLTYPE_STRING, "kame_version", 1654 SYSCTL_DESCR("KAME Version"), 1655 NULL, 0, __UNCONST(__KAME_VERSION), 0, 1656 CTL_NET, PF_INET6, IPPROTO_IPV6, 1657 IPV6CTL_KAME_VERSION, CTL_EOL); 1658 sysctl_createv(clog, 0, NULL, NULL, 1659 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1660 CTLTYPE_INT, "use_deprecated", 1661 SYSCTL_DESCR("Allow use of deprecated addresses as " 1662 "source addresses"), 1663 NULL, 0, &ip6_use_deprecated, 0, 1664 CTL_NET, PF_INET6, IPPROTO_IPV6, 1665 IPV6CTL_USE_DEPRECATED, CTL_EOL); 1666 sysctl_createv(clog, 0, NULL, NULL, 1667 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1668 CTLTYPE_INT, "rr_prune", NULL, 1669 NULL, 0, &ip6_rr_prune, 0, 1670 CTL_NET, PF_INET6, IPPROTO_IPV6, 1671 IPV6CTL_RR_PRUNE, CTL_EOL); 1672 sysctl_createv(clog, 0, NULL, NULL, 1673 CTLFLAG_PERMANENT 1674 #ifndef INET6_BINDV6ONLY 1675 |CTLFLAG_READWRITE, 1676 #endif 1677 CTLTYPE_INT, "v6only", 1678 SYSCTL_DESCR("Disallow PF_INET6 sockets from connecting " 1679 "to PF_INET sockets"), 1680 NULL, 0, &ip6_v6only, 0, 1681 CTL_NET, PF_INET6, IPPROTO_IPV6, 1682 IPV6CTL_V6ONLY, CTL_EOL); 1683 sysctl_createv(clog, 0, NULL, NULL, 1684 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1685 CTLTYPE_INT, "anonportmin", 1686 SYSCTL_DESCR("Lowest ephemeral port number to assign"), 1687 sysctl_net_inet_ip_ports, 0, &ip6_anonportmin, 0, 1688 CTL_NET, PF_INET6, IPPROTO_IPV6, 1689 IPV6CTL_ANONPORTMIN, CTL_EOL); 1690 sysctl_createv(clog, 0, NULL, NULL, 1691 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1692 CTLTYPE_INT, "anonportmax", 1693 SYSCTL_DESCR("Highest ephemeral port number to assign"), 1694 sysctl_net_inet_ip_ports, 0, &ip6_anonportmax, 0, 1695 CTL_NET, PF_INET6, IPPROTO_IPV6, 1696 IPV6CTL_ANONPORTMAX, CTL_EOL); 1697 #ifndef IPNOPRIVPORTS 1698 sysctl_createv(clog, 0, NULL, NULL, 1699 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1700 CTLTYPE_INT, "lowportmin", 1701 SYSCTL_DESCR("Lowest privileged ephemeral port number " 1702 "to assign"), 1703 sysctl_net_inet_ip_ports, 0, &ip6_lowportmin, 0, 1704 CTL_NET, PF_INET6, IPPROTO_IPV6, 1705 IPV6CTL_LOWPORTMIN, CTL_EOL); 1706 sysctl_createv(clog, 0, NULL, NULL, 1707 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1708 CTLTYPE_INT, "lowportmax", 1709 SYSCTL_DESCR("Highest privileged ephemeral port number " 1710 "to assign"), 1711 sysctl_net_inet_ip_ports, 0, &ip6_lowportmax, 0, 1712 CTL_NET, PF_INET6, IPPROTO_IPV6, 1713 IPV6CTL_LOWPORTMAX, CTL_EOL); 1714 #endif /* IPNOPRIVPORTS */ 1715 sysctl_createv(clog, 0, NULL, NULL, 1716 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1717 CTLTYPE_INT, "use_tempaddr", 1718 SYSCTL_DESCR("Use temporary address"), 1719 NULL, 0, &ip6_use_tempaddr, 0, 1720 CTL_NET, PF_INET6, IPPROTO_IPV6, 1721 CTL_CREATE, CTL_EOL); 1722 sysctl_createv(clog, 0, NULL, NULL, 1723 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1724 CTLTYPE_INT, "temppltime", 1725 SYSCTL_DESCR("preferred lifetime of a temporary address"), 1726 NULL, 0, &ip6_temp_preferred_lifetime, 0, 1727 CTL_NET, PF_INET6, IPPROTO_IPV6, 1728 CTL_CREATE, CTL_EOL); 1729 sysctl_createv(clog, 0, NULL, NULL, 1730 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1731 CTLTYPE_INT, "tempvltime", 1732 SYSCTL_DESCR("valid lifetime of a temporary address"), 1733 NULL, 0, &ip6_temp_valid_lifetime, 0, 1734 CTL_NET, PF_INET6, IPPROTO_IPV6, 1735 CTL_CREATE, CTL_EOL); 1736 sysctl_createv(clog, 0, NULL, NULL, 1737 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1738 CTLTYPE_INT, "maxfrags", 1739 SYSCTL_DESCR("Maximum fragments in reassembly queue"), 1740 NULL, 0, &ip6_maxfrags, 0, 1741 CTL_NET, PF_INET6, IPPROTO_IPV6, 1742 IPV6CTL_MAXFRAGS, CTL_EOL); 1743 sysctl_createv(clog, 0, NULL, NULL, 1744 CTLFLAG_PERMANENT, 1745 CTLTYPE_STRUCT, "stats", 1746 SYSCTL_DESCR("IPv6 statistics"), 1747 NULL, 0, &ip6stat, sizeof(ip6stat), 1748 CTL_NET, PF_INET6, IPPROTO_IPV6, 1749 IPV6CTL_STATS, CTL_EOL); 1750 sysctl_createv(clog, 0, NULL, NULL, 1751 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1752 CTLTYPE_INT, "use_defaultzone", 1753 SYSCTL_DESCR("Whether to use the default scope zones"), 1754 NULL, 0, &ip6_use_defzone, 0, 1755 CTL_NET, PF_INET6, IPPROTO_IPV6, 1756 IPV6CTL_USE_DEFAULTZONE, CTL_EOL); 1757 sysctl_createv(clog, 0, NULL, NULL, 1758 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1759 CTLTYPE_INT, "mcast_pmtu", 1760 SYSCTL_DESCR("Enable pMTU discovery for multicast packet"), 1761 NULL, 0, &ip6_mcast_pmtu, 0, 1762 CTL_NET, PF_INET6, IPPROTO_IPV6, 1763 CTL_CREATE, CTL_EOL); 1764 } 1765
Indexes created Wed Sep 24 05:09:52 GMT 2025