1 /* $NetBSD: ip6_input.c,v 1.89 2006/10/12 01:32:39 christos 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 1.89 2006/10/12 01:32:39 christos Exp $"); 66 67 #include "opt_inet.h" 68 #include "opt_inet6.h" 69 #include "opt_ipsec.h" 70 #include "opt_pfil_hooks.h" 71 72 #include <sys/param.h> 73 #include <sys/systm.h> 74 #include <sys/malloc.h> 75 #include <sys/mbuf.h> 76 #include <sys/domain.h> 77 #include <sys/protosw.h> 78 #include <sys/socket.h> 79 #include <sys/socketvar.h> 80 #include <sys/errno.h> 81 #include <sys/time.h> 82 #include <sys/kernel.h> 83 #include <sys/syslog.h> 84 #include <sys/proc.h> 85 #include <sys/sysctl.h> 86 87 #include <net/if.h> 88 #include <net/if_types.h> 89 #include <net/if_dl.h> 90 #include <net/route.h> 91 #include <net/netisr.h> 92 #ifdef PFIL_HOOKS 93 #include <net/pfil.h> 94 #endif 95 96 #include <netinet/in.h> 97 #include <netinet/in_systm.h> 98 #ifdef INET 99 #include <netinet/ip.h> 100 #include <netinet/ip_icmp.h> 101 #endif /* INET */ 102 #include <netinet/ip6.h> 103 #include <netinet6/in6_var.h> 104 #include <netinet6/ip6_var.h> 105 #include <netinet6/in6_pcb.h> 106 #include <netinet/icmp6.h> 107 #include <netinet6/scope6_var.h> 108 #include <netinet6/in6_ifattach.h> 109 #include <netinet6/nd6.h> 110 111 #ifdef IPSEC 112 #include <netinet6/ipsec.h> 113 #endif 114 115 #include <netinet6/ip6protosw.h> 116 117 #include "faith.h" 118 #include "gif.h" 119 120 #if NGIF > 0 121 #include <netinet6/in6_gif.h> 122 #endif 123 124 #include <net/net_osdep.h> 125 126 extern struct domain inet6domain; 127 128 u_char ip6_protox[IPPROTO_MAX]; 129 static int ip6qmaxlen = IFQ_MAXLEN; 130 struct in6_ifaddr *in6_ifaddr; 131 struct ifqueue ip6intrq; 132 133 extern struct callout in6_tmpaddrtimer_ch; 134 135 int ip6_forward_srcrt; /* XXX */ 136 int ip6_sourcecheck; /* XXX */ 137 int ip6_sourcecheck_interval; /* XXX */ 138 139 #ifdef PFIL_HOOKS 140 struct pfil_head inet6_pfil_hook; 141 #endif 142 143 struct ip6stat ip6stat; 144 145 static void ip6_init2 __P((void *)); 146 static struct m_tag *ip6_setdstifaddr __P((struct mbuf *, struct in6_ifaddr *)); 147 148 static int ip6_hopopts_input __P((u_int32_t *, u_int32_t *, struct mbuf **, int *)); 149 static struct mbuf *ip6_pullexthdr __P((struct mbuf *, size_t, int)); 150 151 /* 152 * IP6 initialization: fill in IP6 protocol switch table. 153 * All protocols not implemented in kernel go to raw IP6 protocol handler. 154 */ 155 void 156 ip6_init() 157 { 158 const struct ip6protosw *pr; 159 int i; 160 161 pr = (const struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 162 if (pr == 0) 163 panic("ip6_init"); 164 for (i = 0; i < IPPROTO_MAX; i++) 165 ip6_protox[i] = pr - inet6sw; 166 for (pr = (const struct ip6protosw *)inet6domain.dom_protosw; 167 pr < (const struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++) 168 if (pr->pr_domain->dom_family == PF_INET6 && 169 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) 170 ip6_protox[pr->pr_protocol] = pr - inet6sw; 171 ip6intrq.ifq_maxlen = ip6qmaxlen; 172 scope6_init(); 173 addrsel_policy_init(); 174 nd6_init(); 175 frag6_init(); 176 ip6_desync_factor = arc4random() % MAX_TEMP_DESYNC_FACTOR; 177 178 ip6_init2((void *)0); 179 180 #ifdef PFIL_HOOKS 181 /* Register our Packet Filter hook. */ 182 inet6_pfil_hook.ph_type = PFIL_TYPE_AF; 183 inet6_pfil_hook.ph_af = AF_INET6; 184 i = pfil_head_register(&inet6_pfil_hook); 185 if (i != 0) 186 printf("ip6_init: WARNING: unable to register pfil hook, " 187 "error %d\n", i); 188 #endif /* PFIL_HOOKS */ 189 } 190 191 static void 192 ip6_init2(void *dummy __unused) 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 (__predict_false( 413 m_makewritable(&m, 0, sizeof(struct ip6_hdr), M_DONTWAIT))) 414 goto bad; 415 ip6 = mtod(m, struct ip6_hdr *); 416 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) { 417 ip6stat.ip6s_badscope++; /* XXX */ 418 goto bad; 419 } 420 if (in6_setscope(&ip6->ip6_src, m->m_pkthdr.rcvif, NULL) || 421 in6_setscope(&ip6->ip6_dst, m->m_pkthdr.rcvif, NULL)) { 422 ip6stat.ip6s_badscope++; 423 goto bad; 424 } 425 426 /* 427 * Multicast check 428 */ 429 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 430 struct in6_multi *in6m = 0; 431 432 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast); 433 /* 434 * See if we belong to the destination multicast group on the 435 * arrival interface. 436 */ 437 IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m); 438 if (in6m) 439 ours = 1; 440 else if (!ip6_mrouter) { 441 ip6stat.ip6s_notmember++; 442 ip6stat.ip6s_cantforward++; 443 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 444 goto bad; 445 } 446 deliverifp = m->m_pkthdr.rcvif; 447 goto hbhcheck; 448 } 449 450 /* 451 * Unicast check 452 */ 453 if (ip6_forward_rt.ro_rt != NULL && 454 (ip6_forward_rt.ro_rt->rt_flags & RTF_UP) != 0 && 455 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 456 &((struct sockaddr_in6 *)(&ip6_forward_rt.ro_dst))->sin6_addr)) 457 ip6stat.ip6s_forward_cachehit++; 458 else { 459 struct sockaddr_in6 *dst6; 460 461 if (ip6_forward_rt.ro_rt) { 462 /* route is down or destination is different */ 463 ip6stat.ip6s_forward_cachemiss++; 464 RTFREE(ip6_forward_rt.ro_rt); 465 ip6_forward_rt.ro_rt = 0; 466 } 467 468 bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6)); 469 dst6 = (struct sockaddr_in6 *)&ip6_forward_rt.ro_dst; 470 dst6->sin6_len = sizeof(struct sockaddr_in6); 471 dst6->sin6_family = AF_INET6; 472 dst6->sin6_addr = ip6->ip6_dst; 473 474 rtalloc((struct route *)&ip6_forward_rt); 475 } 476 477 #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key)) 478 479 /* 480 * Accept the packet if the forwarding interface to the destination 481 * according to the routing table is the loopback interface, 482 * unless the associated route has a gateway. 483 * Note that this approach causes to accept a packet if there is a 484 * route to the loopback interface for the destination of the packet. 485 * But we think it's even useful in some situations, e.g. when using 486 * a special daemon which wants to intercept the packet. 487 */ 488 if (ip6_forward_rt.ro_rt && 489 (ip6_forward_rt.ro_rt->rt_flags & 490 (RTF_HOST|RTF_GATEWAY)) == RTF_HOST && 491 !(ip6_forward_rt.ro_rt->rt_flags & RTF_CLONED) && 492 #if 0 493 /* 494 * The check below is redundant since the comparison of 495 * the destination and the key of the rtentry has 496 * already done through looking up the routing table. 497 */ 498 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 499 &rt6_key(ip6_forward_rt.ro_rt)->sin6_addr) && 500 #endif 501 ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) { 502 struct in6_ifaddr *ia6 = 503 (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa; 504 if (ia6->ia6_flags & IN6_IFF_ANYCAST) 505 m->m_flags |= M_ANYCAST6; 506 /* 507 * packets to a tentative, duplicated, or somehow invalid 508 * address must not be accepted. 509 */ 510 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) { 511 /* this address is ready */ 512 ours = 1; 513 deliverifp = ia6->ia_ifp; /* correct? */ 514 goto hbhcheck; 515 } else { 516 /* address is not ready, so discard the packet. */ 517 nd6log((LOG_INFO, 518 "ip6_input: packet to an unready address %s->%s\n", 519 ip6_sprintf(&ip6->ip6_src), 520 ip6_sprintf(&ip6->ip6_dst))); 521 522 goto bad; 523 } 524 } 525 526 /* 527 * FAITH (Firewall Aided Internet Translator) 528 */ 529 #if defined(NFAITH) && 0 < NFAITH 530 if (ip6_keepfaith) { 531 if (ip6_forward_rt.ro_rt && ip6_forward_rt.ro_rt->rt_ifp && 532 ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) { 533 /* XXX do we need more sanity checks? */ 534 ours = 1; 535 deliverifp = ip6_forward_rt.ro_rt->rt_ifp; /* faith */ 536 goto hbhcheck; 537 } 538 } 539 #endif 540 541 #if 0 542 { 543 /* 544 * Last resort: check in6_ifaddr for incoming interface. 545 * The code is here until I update the "goto ours hack" code above 546 * working right. 547 */ 548 struct ifaddr *ifa; 549 for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first; 550 ifa; 551 ifa = ifa->ifa_list.tqe_next) { 552 if (ifa->ifa_addr == NULL) 553 continue; /* just for safety */ 554 if (ifa->ifa_addr->sa_family != AF_INET6) 555 continue; 556 if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) { 557 ours = 1; 558 deliverifp = ifa->ifa_ifp; 559 goto hbhcheck; 560 } 561 } 562 } 563 #endif 564 565 /* 566 * Now there is no reason to process the packet if it's not our own 567 * and we're not a router. 568 */ 569 if (!ip6_forwarding) { 570 ip6stat.ip6s_cantforward++; 571 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 572 goto bad; 573 } 574 575 hbhcheck: 576 /* 577 * record address information into m_tag, if we don't have one yet. 578 * note that we are unable to record it, if the address is not listed 579 * as our interface address (e.g. multicast addresses, addresses 580 * within FAITH prefixes and such). 581 */ 582 if (deliverifp && !ip6_getdstifaddr(m)) { 583 struct in6_ifaddr *ia6; 584 585 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 586 if (ia6) { 587 if (!ip6_setdstifaddr(m, ia6)) { 588 /* 589 * XXX maybe we should drop the packet here, 590 * as we could not provide enough information 591 * to the upper layers. 592 */ 593 } 594 } 595 } 596 597 /* 598 * Process Hop-by-Hop options header if it's contained. 599 * m may be modified in ip6_hopopts_input(). 600 * If a JumboPayload option is included, plen will also be modified. 601 */ 602 plen = (u_int32_t)ntohs(ip6->ip6_plen); 603 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 604 struct ip6_hbh *hbh; 605 606 if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) { 607 #if 0 /*touches NULL pointer*/ 608 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 609 #endif 610 return; /* m have already been freed */ 611 } 612 613 /* adjust pointer */ 614 ip6 = mtod(m, struct ip6_hdr *); 615 616 /* 617 * if the payload length field is 0 and the next header field 618 * indicates Hop-by-Hop Options header, then a Jumbo Payload 619 * option MUST be included. 620 */ 621 if (ip6->ip6_plen == 0 && plen == 0) { 622 /* 623 * Note that if a valid jumbo payload option is 624 * contained, ip6_hopopts_input() must set a valid 625 * (non-zero) payload length to the variable plen. 626 */ 627 ip6stat.ip6s_badoptions++; 628 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 629 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 630 icmp6_error(m, ICMP6_PARAM_PROB, 631 ICMP6_PARAMPROB_HEADER, 632 (caddr_t)&ip6->ip6_plen - (caddr_t)ip6); 633 return; 634 } 635 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 636 sizeof(struct ip6_hbh)); 637 if (hbh == NULL) { 638 ip6stat.ip6s_tooshort++; 639 return; 640 } 641 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 642 nxt = hbh->ip6h_nxt; 643 644 /* 645 * accept the packet if a router alert option is included 646 * and we act as an IPv6 router. 647 */ 648 if (rtalert != ~0 && ip6_forwarding) 649 ours = 1; 650 } else 651 nxt = ip6->ip6_nxt; 652 653 /* 654 * Check that the amount of data in the buffers 655 * is as at least much as the IPv6 header would have us expect. 656 * Trim mbufs if longer than we expect. 657 * Drop packet if shorter than we expect. 658 */ 659 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 660 ip6stat.ip6s_tooshort++; 661 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 662 goto bad; 663 } 664 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 665 if (m->m_len == m->m_pkthdr.len) { 666 m->m_len = sizeof(struct ip6_hdr) + plen; 667 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 668 } else 669 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 670 } 671 672 /* 673 * Forward if desirable. 674 */ 675 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 676 /* 677 * If we are acting as a multicast router, all 678 * incoming multicast packets are passed to the 679 * kernel-level multicast forwarding function. 680 * The packet is returned (relatively) intact; if 681 * ip6_mforward() returns a non-zero value, the packet 682 * must be discarded, else it may be accepted below. 683 */ 684 if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) { 685 ip6stat.ip6s_cantforward++; 686 m_freem(m); 687 return; 688 } 689 if (!ours) { 690 m_freem(m); 691 return; 692 } 693 } else if (!ours) { 694 ip6_forward(m, srcrt); 695 return; 696 } 697 698 ip6 = mtod(m, struct ip6_hdr *); 699 700 /* 701 * Malicious party may be able to use IPv4 mapped addr to confuse 702 * tcp/udp stack and bypass security checks (act as if it was from 703 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious. 704 * 705 * For SIIT end node behavior, you may want to disable the check. 706 * However, you will become vulnerable to attacks using IPv4 mapped 707 * source. 708 */ 709 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 710 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 711 ip6stat.ip6s_badscope++; 712 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 713 goto bad; 714 } 715 716 /* 717 * Tell launch routine the next header 718 */ 719 #ifdef IFA_STATS 720 if (deliverifp != NULL) { 721 struct in6_ifaddr *ia6; 722 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 723 if (ia6) 724 ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len; 725 } 726 #endif 727 ip6stat.ip6s_delivered++; 728 in6_ifstat_inc(deliverifp, ifs6_in_deliver); 729 nest = 0; 730 731 while (nxt != IPPROTO_DONE) { 732 if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) { 733 ip6stat.ip6s_toomanyhdr++; 734 goto bad; 735 } 736 737 /* 738 * protection against faulty packet - there should be 739 * more sanity checks in header chain processing. 740 */ 741 if (m->m_pkthdr.len < off) { 742 ip6stat.ip6s_tooshort++; 743 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 744 goto bad; 745 } 746 747 #ifdef IPSEC 748 /* 749 * enforce IPsec policy checking if we are seeing last header. 750 * note that we do not visit this with protocols with pcb layer 751 * code - like udp/tcp/raw ip. 752 */ 753 if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 && 754 ipsec6_in_reject(m, NULL)) { 755 ipsec6stat.in_polvio++; 756 goto bad; 757 } 758 #endif 759 760 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt); 761 } 762 return; 763 bad: 764 m_freem(m); 765 } 766 767 /* 768 * set/grab in6_ifaddr correspond to IPv6 destination address. 769 */ 770 static struct m_tag * 771 ip6_setdstifaddr(m, ia6) 772 struct mbuf *m; 773 struct in6_ifaddr *ia6; 774 { 775 struct m_tag *mtag; 776 777 mtag = ip6_addaux(m); 778 if (mtag) 779 ((struct ip6aux *)(mtag + 1))->ip6a_dstia6 = ia6; 780 return mtag; /* NULL if failed to set */ 781 } 782 783 struct in6_ifaddr * 784 ip6_getdstifaddr(m) 785 struct mbuf *m; 786 { 787 struct m_tag *mtag; 788 789 mtag = ip6_findaux(m); 790 if (mtag) 791 return ((struct ip6aux *)(mtag + 1))->ip6a_dstia6; 792 else 793 return NULL; 794 } 795 796 /* 797 * Hop-by-Hop options header processing. If a valid jumbo payload option is 798 * included, the real payload length will be stored in plenp. 799 */ 800 static int 801 ip6_hopopts_input(plenp, rtalertp, mp, offp) 802 u_int32_t *plenp; 803 u_int32_t *rtalertp; /* XXX: should be stored more smart way */ 804 struct mbuf **mp; 805 int *offp; 806 { 807 struct mbuf *m = *mp; 808 int off = *offp, hbhlen; 809 struct ip6_hbh *hbh; 810 811 /* validation of the length of the header */ 812 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, 813 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh)); 814 if (hbh == NULL) { 815 ip6stat.ip6s_tooshort++; 816 return -1; 817 } 818 hbhlen = (hbh->ip6h_len + 1) << 3; 819 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 820 hbhlen); 821 if (hbh == NULL) { 822 ip6stat.ip6s_tooshort++; 823 return -1; 824 } 825 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 826 off += hbhlen; 827 hbhlen -= sizeof(struct ip6_hbh); 828 829 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 830 hbhlen, rtalertp, plenp) < 0) 831 return (-1); 832 833 *offp = off; 834 *mp = m; 835 return (0); 836 } 837 838 /* 839 * Search header for all Hop-by-hop options and process each option. 840 * This function is separate from ip6_hopopts_input() in order to 841 * handle a case where the sending node itself process its hop-by-hop 842 * options header. In such a case, the function is called from ip6_output(). 843 * 844 * The function assumes that hbh header is located right after the IPv6 header 845 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to 846 * opthead + hbhlen is located in continuous memory region. 847 */ 848 int 849 ip6_process_hopopts(m, opthead, hbhlen, rtalertp, plenp) 850 struct mbuf *m; 851 u_int8_t *opthead; 852 int hbhlen; 853 u_int32_t *rtalertp; 854 u_int32_t *plenp; 855 { 856 struct ip6_hdr *ip6; 857 int optlen = 0; 858 u_int8_t *opt = opthead; 859 u_int16_t rtalert_val; 860 u_int32_t jumboplen; 861 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh); 862 863 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 864 switch (*opt) { 865 case IP6OPT_PAD1: 866 optlen = 1; 867 break; 868 case IP6OPT_PADN: 869 if (hbhlen < IP6OPT_MINLEN) { 870 ip6stat.ip6s_toosmall++; 871 goto bad; 872 } 873 optlen = *(opt + 1) + 2; 874 break; 875 case IP6OPT_RTALERT: 876 /* XXX may need check for alignment */ 877 if (hbhlen < IP6OPT_RTALERT_LEN) { 878 ip6stat.ip6s_toosmall++; 879 goto bad; 880 } 881 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) { 882 /* XXX stat */ 883 icmp6_error(m, ICMP6_PARAM_PROB, 884 ICMP6_PARAMPROB_HEADER, 885 erroff + opt + 1 - opthead); 886 return (-1); 887 } 888 optlen = IP6OPT_RTALERT_LEN; 889 bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2); 890 *rtalertp = ntohs(rtalert_val); 891 break; 892 case IP6OPT_JUMBO: 893 /* XXX may need check for alignment */ 894 if (hbhlen < IP6OPT_JUMBO_LEN) { 895 ip6stat.ip6s_toosmall++; 896 goto bad; 897 } 898 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) { 899 /* XXX stat */ 900 icmp6_error(m, ICMP6_PARAM_PROB, 901 ICMP6_PARAMPROB_HEADER, 902 erroff + opt + 1 - opthead); 903 return (-1); 904 } 905 optlen = IP6OPT_JUMBO_LEN; 906 907 /* 908 * IPv6 packets that have non 0 payload length 909 * must not contain a jumbo payload option. 910 */ 911 ip6 = mtod(m, struct ip6_hdr *); 912 if (ip6->ip6_plen) { 913 ip6stat.ip6s_badoptions++; 914 icmp6_error(m, ICMP6_PARAM_PROB, 915 ICMP6_PARAMPROB_HEADER, 916 erroff + opt - opthead); 917 return (-1); 918 } 919 920 /* 921 * We may see jumbolen in unaligned location, so 922 * we'd need to perform bcopy(). 923 */ 924 bcopy(opt + 2, &jumboplen, sizeof(jumboplen)); 925 jumboplen = (u_int32_t)htonl(jumboplen); 926 927 #if 1 928 /* 929 * if there are multiple jumbo payload options, 930 * *plenp will be non-zero and the packet will be 931 * rejected. 932 * the behavior may need some debate in ipngwg - 933 * multiple options does not make sense, however, 934 * there's no explicit mention in specification. 935 */ 936 if (*plenp != 0) { 937 ip6stat.ip6s_badoptions++; 938 icmp6_error(m, ICMP6_PARAM_PROB, 939 ICMP6_PARAMPROB_HEADER, 940 erroff + opt + 2 - opthead); 941 return (-1); 942 } 943 #endif 944 945 /* 946 * jumbo payload length must be larger than 65535. 947 */ 948 if (jumboplen <= IPV6_MAXPACKET) { 949 ip6stat.ip6s_badoptions++; 950 icmp6_error(m, ICMP6_PARAM_PROB, 951 ICMP6_PARAMPROB_HEADER, 952 erroff + opt + 2 - opthead); 953 return (-1); 954 } 955 *plenp = jumboplen; 956 957 break; 958 default: /* unknown option */ 959 if (hbhlen < IP6OPT_MINLEN) { 960 ip6stat.ip6s_toosmall++; 961 goto bad; 962 } 963 optlen = ip6_unknown_opt(opt, m, 964 erroff + opt - opthead); 965 if (optlen == -1) 966 return (-1); 967 optlen += 2; 968 break; 969 } 970 } 971 972 return (0); 973 974 bad: 975 m_freem(m); 976 return (-1); 977 } 978 979 /* 980 * Unknown option processing. 981 * The third argument `off' is the offset from the IPv6 header to the option, 982 * which is necessary if the IPv6 header the and option header and IPv6 header 983 * is not continuous in order to return an ICMPv6 error. 984 */ 985 int 986 ip6_unknown_opt(optp, m, off) 987 u_int8_t *optp; 988 struct mbuf *m; 989 int off; 990 { 991 struct ip6_hdr *ip6; 992 993 switch (IP6OPT_TYPE(*optp)) { 994 case IP6OPT_TYPE_SKIP: /* ignore the option */ 995 return ((int)*(optp + 1)); 996 case IP6OPT_TYPE_DISCARD: /* silently discard */ 997 m_freem(m); 998 return (-1); 999 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 1000 ip6stat.ip6s_badoptions++; 1001 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 1002 return (-1); 1003 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 1004 ip6stat.ip6s_badoptions++; 1005 ip6 = mtod(m, struct ip6_hdr *); 1006 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 1007 (m->m_flags & (M_BCAST|M_MCAST))) 1008 m_freem(m); 1009 else 1010 icmp6_error(m, ICMP6_PARAM_PROB, 1011 ICMP6_PARAMPROB_OPTION, off); 1012 return (-1); 1013 } 1014 1015 m_freem(m); /* XXX: NOTREACHED */ 1016 return (-1); 1017 } 1018 1019 /* 1020 * Create the "control" list for this pcb. 1021 * 1022 * The routine will be called from upper layer handlers like tcp6_input(). 1023 * Thus the routine assumes that the caller (tcp6_input) have already 1024 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the 1025 * very first mbuf on the mbuf chain. 1026 * We may want to add some infinite loop prevention or sanity checks for safety. 1027 * (This applies only when you are using KAME mbuf chain restriction, i.e. 1028 * you are using IP6_EXTHDR_CHECK() not m_pulldown()) 1029 */ 1030 void 1031 ip6_savecontrol(in6p, mp, ip6, m) 1032 struct in6pcb *in6p; 1033 struct mbuf **mp; 1034 struct ip6_hdr *ip6; 1035 struct mbuf *m; 1036 { 1037 #ifdef RFC2292 1038 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y)) 1039 #else 1040 #define IS2292(x, y) (y) 1041 #endif 1042 1043 #ifdef SO_TIMESTAMP 1044 if (in6p->in6p_socket->so_options & SO_TIMESTAMP) { 1045 struct timeval tv; 1046 1047 microtime(&tv); 1048 *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv), 1049 SCM_TIMESTAMP, SOL_SOCKET); 1050 if (*mp) 1051 mp = &(*mp)->m_next; 1052 } 1053 #endif 1054 1055 /* some OSes call this logic with IPv4 packet, for SO_TIMESTAMP */ 1056 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) 1057 return; 1058 1059 /* RFC 2292 sec. 5 */ 1060 if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) { 1061 struct in6_pktinfo pi6; 1062 1063 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr)); 1064 in6_clearscope(&pi6.ipi6_addr); /* XXX */ 1065 pi6.ipi6_ifindex = m->m_pkthdr.rcvif ? 1066 m->m_pkthdr.rcvif->if_index : 0; 1067 *mp = sbcreatecontrol((caddr_t) &pi6, 1068 sizeof(struct in6_pktinfo), 1069 IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6); 1070 if (*mp) 1071 mp = &(*mp)->m_next; 1072 } 1073 1074 if (in6p->in6p_flags & IN6P_HOPLIMIT) { 1075 int hlim = ip6->ip6_hlim & 0xff; 1076 1077 *mp = sbcreatecontrol((caddr_t) &hlim, sizeof(int), 1078 IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6); 1079 if (*mp) 1080 mp = &(*mp)->m_next; 1081 } 1082 1083 if ((in6p->in6p_flags & IN6P_TCLASS) != 0) { 1084 u_int32_t flowinfo; 1085 int tclass; 1086 1087 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK); 1088 flowinfo >>= 20; 1089 1090 tclass = flowinfo & 0xff; 1091 *mp = sbcreatecontrol((caddr_t)&tclass, sizeof(tclass), 1092 IPV6_TCLASS, IPPROTO_IPV6); 1093 1094 if (*mp) 1095 mp = &(*mp)->m_next; 1096 } 1097 1098 /* 1099 * IPV6_HOPOPTS socket option. Recall that we required super-user 1100 * privilege for the option (see ip6_ctloutput), but it might be too 1101 * strict, since there might be some hop-by-hop options which can be 1102 * returned to normal user. 1103 * See also RFC3542 section 8 (or RFC2292 section 6). 1104 */ 1105 if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0) { 1106 /* 1107 * Check if a hop-by-hop options header is contatined in the 1108 * received packet, and if so, store the options as ancillary 1109 * data. Note that a hop-by-hop options header must be 1110 * just after the IPv6 header, which fact is assured through 1111 * the IPv6 input processing. 1112 */ 1113 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1114 if (xip6->ip6_nxt == IPPROTO_HOPOPTS) { 1115 struct ip6_hbh *hbh; 1116 int hbhlen; 1117 struct mbuf *ext; 1118 1119 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr), 1120 xip6->ip6_nxt); 1121 if (ext == NULL) { 1122 ip6stat.ip6s_tooshort++; 1123 return; 1124 } 1125 hbh = mtod(ext, struct ip6_hbh *); 1126 hbhlen = (hbh->ip6h_len + 1) << 3; 1127 if (hbhlen != ext->m_len) { 1128 m_freem(ext); 1129 ip6stat.ip6s_tooshort++; 1130 return; 1131 } 1132 1133 /* 1134 * XXX: We copy whole the header even if a jumbo 1135 * payload option is included, which option is to 1136 * be removed before returning in the RFC 2292. 1137 * Note: this constraint is removed in RFC3542. 1138 */ 1139 *mp = sbcreatecontrol((caddr_t)hbh, hbhlen, 1140 IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS), 1141 IPPROTO_IPV6); 1142 if (*mp) 1143 mp = &(*mp)->m_next; 1144 m_freem(ext); 1145 } 1146 } 1147 1148 /* IPV6_DSTOPTS and IPV6_RTHDR socket options */ 1149 if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) { 1150 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1151 int nxt = xip6->ip6_nxt, off = sizeof(struct ip6_hdr); 1152 1153 /* 1154 * Search for destination options headers or routing 1155 * header(s) through the header chain, and stores each 1156 * header as ancillary data. 1157 * Note that the order of the headers remains in 1158 * the chain of ancillary data. 1159 */ 1160 for (;;) { /* is explicit loop prevention necessary? */ 1161 struct ip6_ext *ip6e = NULL; 1162 int elen; 1163 struct mbuf *ext = NULL; 1164 1165 /* 1166 * if it is not an extension header, don't try to 1167 * pull it from the chain. 1168 */ 1169 switch (nxt) { 1170 case IPPROTO_DSTOPTS: 1171 case IPPROTO_ROUTING: 1172 case IPPROTO_HOPOPTS: 1173 case IPPROTO_AH: /* is it possible? */ 1174 break; 1175 default: 1176 goto loopend; 1177 } 1178 1179 ext = ip6_pullexthdr(m, off, nxt); 1180 if (ext == NULL) { 1181 ip6stat.ip6s_tooshort++; 1182 return; 1183 } 1184 ip6e = mtod(ext, struct ip6_ext *); 1185 if (nxt == IPPROTO_AH) 1186 elen = (ip6e->ip6e_len + 2) << 2; 1187 else 1188 elen = (ip6e->ip6e_len + 1) << 3; 1189 if (elen != ext->m_len) { 1190 m_freem(ext); 1191 ip6stat.ip6s_tooshort++; 1192 return; 1193 } 1194 KASSERT(IP6_HDR_ALIGNED_P(ip6e)); 1195 1196 switch (nxt) { 1197 case IPPROTO_DSTOPTS: 1198 if (!in6p->in6p_flags & IN6P_DSTOPTS) 1199 break; 1200 1201 *mp = sbcreatecontrol((caddr_t)ip6e, elen, 1202 IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS), 1203 IPPROTO_IPV6); 1204 if (*mp) 1205 mp = &(*mp)->m_next; 1206 break; 1207 1208 case IPPROTO_ROUTING: 1209 if (!in6p->in6p_flags & IN6P_RTHDR) 1210 break; 1211 1212 *mp = sbcreatecontrol((caddr_t)ip6e, elen, 1213 IS2292(IPV6_2292RTHDR, IPV6_RTHDR), 1214 IPPROTO_IPV6); 1215 if (*mp) 1216 mp = &(*mp)->m_next; 1217 break; 1218 1219 case IPPROTO_HOPOPTS: 1220 case IPPROTO_AH: /* is it possible? */ 1221 break; 1222 1223 default: 1224 /* 1225 * other cases have been filtered in the above. 1226 * none will visit this case. here we supply 1227 * the code just in case (nxt overwritten or 1228 * other cases). 1229 */ 1230 m_freem(ext); 1231 goto loopend; 1232 1233 } 1234 1235 /* proceed with the next header. */ 1236 off += elen; 1237 nxt = ip6e->ip6e_nxt; 1238 ip6e = NULL; 1239 m_freem(ext); 1240 ext = NULL; 1241 } 1242 loopend: 1243 ; 1244 } 1245 } 1246 #undef IS2292 1247 1248 1249 void 1250 ip6_notify_pmtu(struct in6pcb *in6p, struct sockaddr_in6 *dst, uint32_t *mtu) 1251 { 1252 struct socket *so; 1253 struct mbuf *m_mtu; 1254 struct ip6_mtuinfo mtuctl; 1255 1256 so = in6p->in6p_socket; 1257 1258 if (mtu == NULL) 1259 return; 1260 1261 #ifdef DIAGNOSTIC 1262 if (so == NULL) /* I believe this is impossible */ 1263 panic("ip6_notify_pmtu: socket is NULL"); 1264 #endif 1265 1266 memset(&mtuctl, 0, sizeof(mtuctl)); /* zero-clear for safety */ 1267 mtuctl.ip6m_mtu = *mtu; 1268 mtuctl.ip6m_addr = *dst; 1269 if (sa6_recoverscope(&mtuctl.ip6m_addr)) 1270 return; 1271 1272 if ((m_mtu = sbcreatecontrol((caddr_t)&mtuctl, sizeof(mtuctl), 1273 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL) 1274 return; 1275 1276 if (sbappendaddr(&so->so_rcv, (struct sockaddr *)dst, NULL, m_mtu) 1277 == 0) { 1278 m_freem(m_mtu); 1279 /* XXX: should count statistics */ 1280 } else 1281 sorwakeup(so); 1282 1283 return; 1284 } 1285 1286 /* 1287 * pull single extension header from mbuf chain. returns single mbuf that 1288 * contains the result, or NULL on error. 1289 */ 1290 static struct mbuf * 1291 ip6_pullexthdr(m, off, nxt) 1292 struct mbuf *m; 1293 size_t off; 1294 int nxt; 1295 { 1296 struct ip6_ext ip6e; 1297 size_t elen; 1298 struct mbuf *n; 1299 1300 #ifdef DIAGNOSTIC 1301 switch (nxt) { 1302 case IPPROTO_DSTOPTS: 1303 case IPPROTO_ROUTING: 1304 case IPPROTO_HOPOPTS: 1305 case IPPROTO_AH: /* is it possible? */ 1306 break; 1307 default: 1308 printf("ip6_pullexthdr: invalid nxt=%d\n", nxt); 1309 } 1310 #endif 1311 1312 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1313 if (nxt == IPPROTO_AH) 1314 elen = (ip6e.ip6e_len + 2) << 2; 1315 else 1316 elen = (ip6e.ip6e_len + 1) << 3; 1317 1318 MGET(n, M_DONTWAIT, MT_DATA); 1319 if (n && elen >= MLEN) { 1320 MCLGET(n, M_DONTWAIT); 1321 if ((n->m_flags & M_EXT) == 0) { 1322 m_free(n); 1323 n = NULL; 1324 } 1325 } 1326 if (!n) 1327 return NULL; 1328 1329 n->m_len = 0; 1330 if (elen >= M_TRAILINGSPACE(n)) { 1331 m_free(n); 1332 return NULL; 1333 } 1334 1335 m_copydata(m, off, elen, mtod(n, caddr_t)); 1336 n->m_len = elen; 1337 return n; 1338 } 1339 1340 /* 1341 * Get pointer to the previous header followed by the header 1342 * currently processed. 1343 * XXX: This function supposes that 1344 * M includes all headers, 1345 * the next header field and the header length field of each header 1346 * are valid, and 1347 * the sum of each header length equals to OFF. 1348 * Because of these assumptions, this function must be called very 1349 * carefully. Moreover, it will not be used in the near future when 1350 * we develop `neater' mechanism to process extension headers. 1351 */ 1352 u_int8_t * 1353 ip6_get_prevhdr(m, off) 1354 struct mbuf *m; 1355 int off; 1356 { 1357 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1358 1359 if (off == sizeof(struct ip6_hdr)) 1360 return (&ip6->ip6_nxt); 1361 else { 1362 int len, nxt; 1363 struct ip6_ext *ip6e = NULL; 1364 1365 nxt = ip6->ip6_nxt; 1366 len = sizeof(struct ip6_hdr); 1367 while (len < off) { 1368 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len); 1369 1370 switch (nxt) { 1371 case IPPROTO_FRAGMENT: 1372 len += sizeof(struct ip6_frag); 1373 break; 1374 case IPPROTO_AH: 1375 len += (ip6e->ip6e_len + 2) << 2; 1376 break; 1377 default: 1378 len += (ip6e->ip6e_len + 1) << 3; 1379 break; 1380 } 1381 nxt = ip6e->ip6e_nxt; 1382 } 1383 if (ip6e) 1384 return (&ip6e->ip6e_nxt); 1385 else 1386 return NULL; 1387 } 1388 } 1389 1390 /* 1391 * get next header offset. m will be retained. 1392 */ 1393 int 1394 ip6_nexthdr(m, off, proto, nxtp) 1395 struct mbuf *m; 1396 int off; 1397 int proto; 1398 int *nxtp; 1399 { 1400 struct ip6_hdr ip6; 1401 struct ip6_ext ip6e; 1402 struct ip6_frag fh; 1403 1404 /* just in case */ 1405 if (m == NULL) 1406 panic("ip6_nexthdr: m == NULL"); 1407 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off) 1408 return -1; 1409 1410 switch (proto) { 1411 case IPPROTO_IPV6: 1412 /* do not chase beyond intermediate IPv6 headers */ 1413 if (off != 0) 1414 return -1; 1415 if (m->m_pkthdr.len < off + sizeof(ip6)) 1416 return -1; 1417 m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6); 1418 if (nxtp) 1419 *nxtp = ip6.ip6_nxt; 1420 off += sizeof(ip6); 1421 return off; 1422 1423 case IPPROTO_FRAGMENT: 1424 /* 1425 * terminate parsing if it is not the first fragment, 1426 * it does not make sense to parse through it. 1427 */ 1428 if (m->m_pkthdr.len < off + sizeof(fh)) 1429 return -1; 1430 m_copydata(m, off, sizeof(fh), (caddr_t)&fh); 1431 if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0) 1432 return -1; 1433 if (nxtp) 1434 *nxtp = fh.ip6f_nxt; 1435 off += sizeof(struct ip6_frag); 1436 return off; 1437 1438 case IPPROTO_AH: 1439 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1440 return -1; 1441 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1442 if (nxtp) 1443 *nxtp = ip6e.ip6e_nxt; 1444 off += (ip6e.ip6e_len + 2) << 2; 1445 if (m->m_pkthdr.len < off) 1446 return -1; 1447 return off; 1448 1449 case IPPROTO_HOPOPTS: 1450 case IPPROTO_ROUTING: 1451 case IPPROTO_DSTOPTS: 1452 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1453 return -1; 1454 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1455 if (nxtp) 1456 *nxtp = ip6e.ip6e_nxt; 1457 off += (ip6e.ip6e_len + 1) << 3; 1458 if (m->m_pkthdr.len < off) 1459 return -1; 1460 return off; 1461 1462 case IPPROTO_NONE: 1463 case IPPROTO_ESP: 1464 case IPPROTO_IPCOMP: 1465 /* give up */ 1466 return -1; 1467 1468 default: 1469 return -1; 1470 } 1471 } 1472 1473 /* 1474 * get offset for the last header in the chain. m will be kept untainted. 1475 */ 1476 int 1477 ip6_lasthdr(m, off, proto, nxtp) 1478 struct mbuf *m; 1479 int off; 1480 int proto; 1481 int *nxtp; 1482 { 1483 int newoff; 1484 int nxt; 1485 1486 if (!nxtp) { 1487 nxt = -1; 1488 nxtp = &nxt; 1489 } 1490 for (;;) { 1491 newoff = ip6_nexthdr(m, off, proto, nxtp); 1492 if (newoff < 0) 1493 return off; 1494 else if (newoff < off) 1495 return -1; /* invalid */ 1496 else if (newoff == off) 1497 return newoff; 1498 1499 off = newoff; 1500 proto = *nxtp; 1501 } 1502 } 1503 1504 struct m_tag * 1505 ip6_addaux(m) 1506 struct mbuf *m; 1507 { 1508 struct m_tag *mtag; 1509 1510 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1511 if (!mtag) { 1512 mtag = m_tag_get(PACKET_TAG_INET6, sizeof(struct ip6aux), 1513 M_NOWAIT); 1514 if (mtag) { 1515 m_tag_prepend(m, mtag); 1516 bzero(mtag + 1, sizeof(struct ip6aux)); 1517 } 1518 } 1519 return mtag; 1520 } 1521 1522 struct m_tag * 1523 ip6_findaux(m) 1524 struct mbuf *m; 1525 { 1526 struct m_tag *mtag; 1527 1528 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1529 return mtag; 1530 } 1531 1532 void 1533 ip6_delaux(m) 1534 struct mbuf *m; 1535 { 1536 struct m_tag *mtag; 1537 1538 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1539 if (mtag) 1540 m_tag_delete(m, mtag); 1541 } 1542 1543 /* 1544 * System control for IP6 1545 */ 1546 1547 u_char inet6ctlerrmap[PRC_NCMDS] = { 1548 0, 0, 0, 0, 1549 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 1550 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 1551 EMSGSIZE, EHOSTUNREACH, 0, 0, 1552 0, 0, 0, 0, 1553 ENOPROTOOPT 1554 }; 1555 1556 SYSCTL_SETUP(sysctl_net_inet6_ip6_setup, "sysctl net.inet6.ip6 subtree setup") 1557 { 1558 #ifdef RFC2292 1559 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y)) 1560 #else 1561 #define IS2292(x, y) (y) 1562 #endif 1563 1564 sysctl_createv(clog, 0, NULL, NULL, 1565 CTLFLAG_PERMANENT, 1566 CTLTYPE_NODE, "net", NULL, 1567 NULL, 0, NULL, 0, 1568 CTL_NET, CTL_EOL); 1569 sysctl_createv(clog, 0, NULL, NULL, 1570 CTLFLAG_PERMANENT, 1571 CTLTYPE_NODE, "inet6", 1572 SYSCTL_DESCR("PF_INET6 related settings"), 1573 NULL, 0, NULL, 0, 1574 CTL_NET, PF_INET6, CTL_EOL); 1575 sysctl_createv(clog, 0, NULL, NULL, 1576 CTLFLAG_PERMANENT, 1577 CTLTYPE_NODE, "ip6", 1578 SYSCTL_DESCR("IPv6 related settings"), 1579 NULL, 0, NULL, 0, 1580 CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_EOL); 1581 1582 sysctl_createv(clog, 0, NULL, NULL, 1583 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1584 CTLTYPE_INT, "forwarding", 1585 SYSCTL_DESCR("Enable forwarding of INET6 datagrams"), 1586 NULL, 0, &ip6_forwarding, 0, 1587 CTL_NET, PF_INET6, IPPROTO_IPV6, 1588 IPV6CTL_FORWARDING, CTL_EOL); 1589 sysctl_createv(clog, 0, NULL, NULL, 1590 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1591 CTLTYPE_INT, "redirect", 1592 SYSCTL_DESCR("Enable sending of ICMPv6 redirect messages"), 1593 NULL, 0, &ip6_sendredirects, 0, 1594 CTL_NET, PF_INET6, IPPROTO_IPV6, 1595 IPV6CTL_SENDREDIRECTS, CTL_EOL); 1596 sysctl_createv(clog, 0, NULL, NULL, 1597 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1598 CTLTYPE_INT, "hlim", 1599 SYSCTL_DESCR("Hop limit for an INET6 datagram"), 1600 NULL, 0, &ip6_defhlim, 0, 1601 CTL_NET, PF_INET6, IPPROTO_IPV6, 1602 IPV6CTL_DEFHLIM, CTL_EOL); 1603 #ifdef notyet 1604 sysctl_createv(clog, 0, NULL, NULL, 1605 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1606 CTLTYPE_INT, "mtu", NULL, 1607 NULL, 0, &, 0, 1608 CTL_NET, PF_INET6, IPPROTO_IPV6, 1609 IPV6CTL_DEFMTU, CTL_EOL); 1610 #endif 1611 #ifdef __no_idea__ 1612 sysctl_createv(clog, 0, NULL, NULL, 1613 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1614 CTLTYPE_INT, "forwsrcrt", NULL, 1615 NULL, 0, &?, 0, 1616 CTL_NET, PF_INET6, IPPROTO_IPV6, 1617 IPV6CTL_FORWSRCRT, CTL_EOL); 1618 sysctl_createv(clog, 0, NULL, NULL, 1619 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1620 CTLTYPE_STRUCT, "mrtstats", NULL, 1621 NULL, 0, &?, sizeof(?), 1622 CTL_NET, PF_INET6, IPPROTO_IPV6, 1623 IPV6CTL_MRTSTATS, CTL_EOL); 1624 sysctl_createv(clog, 0, NULL, NULL, 1625 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1626 CTLTYPE_?, "mrtproto", NULL, 1627 NULL, 0, &?, sizeof(?), 1628 CTL_NET, PF_INET6, IPPROTO_IPV6, 1629 IPV6CTL_MRTPROTO, CTL_EOL); 1630 #endif 1631 sysctl_createv(clog, 0, NULL, NULL, 1632 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1633 CTLTYPE_INT, "maxfragpackets", 1634 SYSCTL_DESCR("Maximum number of fragments to buffer " 1635 "for reassembly"), 1636 NULL, 0, &ip6_maxfragpackets, 0, 1637 CTL_NET, PF_INET6, IPPROTO_IPV6, 1638 IPV6CTL_MAXFRAGPACKETS, CTL_EOL); 1639 #ifdef __no_idea__ 1640 sysctl_createv(clog, 0, NULL, NULL, 1641 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1642 CTLTYPE_INT, "sourcecheck", NULL, 1643 NULL, 0, &?, 0, 1644 CTL_NET, PF_INET6, IPPROTO_IPV6, 1645 IPV6CTL_SOURCECHECK, CTL_EOL); 1646 sysctl_createv(clog, 0, NULL, NULL, 1647 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1648 CTLTYPE_INT, "sourcecheck_logint", NULL, 1649 NULL, 0, &?, 0, 1650 CTL_NET, PF_INET6, IPPROTO_IPV6, 1651 IPV6CTL_SOURCECHECK_LOGINT, CTL_EOL); 1652 #endif 1653 sysctl_createv(clog, 0, NULL, NULL, 1654 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1655 CTLTYPE_INT, "accept_rtadv", 1656 SYSCTL_DESCR("Accept router advertisements"), 1657 NULL, 0, &ip6_accept_rtadv, 0, 1658 CTL_NET, PF_INET6, IPPROTO_IPV6, 1659 IPV6CTL_ACCEPT_RTADV, CTL_EOL); 1660 sysctl_createv(clog, 0, NULL, NULL, 1661 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1662 CTLTYPE_INT, "keepfaith", 1663 SYSCTL_DESCR("Activate faith interface"), 1664 NULL, 0, &ip6_keepfaith, 0, 1665 CTL_NET, PF_INET6, IPPROTO_IPV6, 1666 IPV6CTL_KEEPFAITH, CTL_EOL); 1667 sysctl_createv(clog, 0, NULL, NULL, 1668 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1669 CTLTYPE_INT, "log_interval", 1670 SYSCTL_DESCR("Minumum interval between logging " 1671 "unroutable packets"), 1672 NULL, 0, &ip6_log_interval, 0, 1673 CTL_NET, PF_INET6, IPPROTO_IPV6, 1674 IPV6CTL_LOG_INTERVAL, CTL_EOL); 1675 sysctl_createv(clog, 0, NULL, NULL, 1676 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1677 CTLTYPE_INT, "hdrnestlimit", 1678 SYSCTL_DESCR("Maximum number of nested IPv6 headers"), 1679 NULL, 0, &ip6_hdrnestlimit, 0, 1680 CTL_NET, PF_INET6, IPPROTO_IPV6, 1681 IPV6CTL_HDRNESTLIMIT, CTL_EOL); 1682 sysctl_createv(clog, 0, NULL, NULL, 1683 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1684 CTLTYPE_INT, "dad_count", 1685 SYSCTL_DESCR("Number of Duplicate Address Detection " 1686 "probes to send"), 1687 NULL, 0, &ip6_dad_count, 0, 1688 CTL_NET, PF_INET6, IPPROTO_IPV6, 1689 IPV6CTL_DAD_COUNT, CTL_EOL); 1690 sysctl_createv(clog, 0, NULL, NULL, 1691 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1692 CTLTYPE_INT, "auto_flowlabel", 1693 SYSCTL_DESCR("Assign random IPv6 flow labels"), 1694 NULL, 0, &ip6_auto_flowlabel, 0, 1695 CTL_NET, PF_INET6, IPPROTO_IPV6, 1696 IPV6CTL_AUTO_FLOWLABEL, CTL_EOL); 1697 sysctl_createv(clog, 0, NULL, NULL, 1698 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1699 CTLTYPE_INT, "defmcasthlim", 1700 SYSCTL_DESCR("Default multicast hop limit"), 1701 NULL, 0, &ip6_defmcasthlim, 0, 1702 CTL_NET, PF_INET6, IPPROTO_IPV6, 1703 IPV6CTL_DEFMCASTHLIM, CTL_EOL); 1704 #if NGIF > 0 1705 sysctl_createv(clog, 0, NULL, NULL, 1706 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1707 CTLTYPE_INT, "gifhlim", 1708 SYSCTL_DESCR("Default hop limit for a gif tunnel datagram"), 1709 NULL, 0, &ip6_gif_hlim, 0, 1710 CTL_NET, PF_INET6, IPPROTO_IPV6, 1711 IPV6CTL_GIF_HLIM, CTL_EOL); 1712 #endif /* NGIF */ 1713 sysctl_createv(clog, 0, NULL, NULL, 1714 CTLFLAG_PERMANENT, 1715 CTLTYPE_STRING, "kame_version", 1716 SYSCTL_DESCR("KAME Version"), 1717 NULL, 0, __UNCONST(__KAME_VERSION), 0, 1718 CTL_NET, PF_INET6, IPPROTO_IPV6, 1719 IPV6CTL_KAME_VERSION, CTL_EOL); 1720 sysctl_createv(clog, 0, NULL, NULL, 1721 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1722 CTLTYPE_INT, "use_deprecated", 1723 SYSCTL_DESCR("Allow use of deprecated addresses as " 1724 "source addresses"), 1725 NULL, 0, &ip6_use_deprecated, 0, 1726 CTL_NET, PF_INET6, IPPROTO_IPV6, 1727 IPV6CTL_USE_DEPRECATED, CTL_EOL); 1728 sysctl_createv(clog, 0, NULL, NULL, 1729 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1730 CTLTYPE_INT, "rr_prune", NULL, 1731 NULL, 0, &ip6_rr_prune, 0, 1732 CTL_NET, PF_INET6, IPPROTO_IPV6, 1733 IPV6CTL_RR_PRUNE, CTL_EOL); 1734 sysctl_createv(clog, 0, NULL, NULL, 1735 CTLFLAG_PERMANENT 1736 #ifndef INET6_BINDV6ONLY 1737 |CTLFLAG_READWRITE, 1738 #endif 1739 CTLTYPE_INT, "v6only", 1740 SYSCTL_DESCR("Disallow PF_INET6 sockets from connecting " 1741 "to PF_INET sockets"), 1742 NULL, 0, &ip6_v6only, 0, 1743 CTL_NET, PF_INET6, IPPROTO_IPV6, 1744 IPV6CTL_V6ONLY, CTL_EOL); 1745 sysctl_createv(clog, 0, NULL, NULL, 1746 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1747 CTLTYPE_INT, "anonportmin", 1748 SYSCTL_DESCR("Lowest ephemeral port number to assign"), 1749 sysctl_net_inet_ip_ports, 0, &ip6_anonportmin, 0, 1750 CTL_NET, PF_INET6, IPPROTO_IPV6, 1751 IPV6CTL_ANONPORTMIN, CTL_EOL); 1752 sysctl_createv(clog, 0, NULL, NULL, 1753 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1754 CTLTYPE_INT, "anonportmax", 1755 SYSCTL_DESCR("Highest ephemeral port number to assign"), 1756 sysctl_net_inet_ip_ports, 0, &ip6_anonportmax, 0, 1757 CTL_NET, PF_INET6, IPPROTO_IPV6, 1758 IPV6CTL_ANONPORTMAX, CTL_EOL); 1759 #ifndef IPNOPRIVPORTS 1760 sysctl_createv(clog, 0, NULL, NULL, 1761 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1762 CTLTYPE_INT, "lowportmin", 1763 SYSCTL_DESCR("Lowest privileged ephemeral port number " 1764 "to assign"), 1765 sysctl_net_inet_ip_ports, 0, &ip6_lowportmin, 0, 1766 CTL_NET, PF_INET6, IPPROTO_IPV6, 1767 IPV6CTL_LOWPORTMIN, CTL_EOL); 1768 sysctl_createv(clog, 0, NULL, NULL, 1769 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1770 CTLTYPE_INT, "lowportmax", 1771 SYSCTL_DESCR("Highest privileged ephemeral port number " 1772 "to assign"), 1773 sysctl_net_inet_ip_ports, 0, &ip6_lowportmax, 0, 1774 CTL_NET, PF_INET6, IPPROTO_IPV6, 1775 IPV6CTL_LOWPORTMAX, CTL_EOL); 1776 #endif /* IPNOPRIVPORTS */ 1777 sysctl_createv(clog, 0, NULL, NULL, 1778 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1779 CTLTYPE_INT, "use_tempaddr", 1780 SYSCTL_DESCR("Use temporary address"), 1781 NULL, 0, &ip6_use_tempaddr, 0, 1782 CTL_NET, PF_INET6, IPPROTO_IPV6, 1783 CTL_CREATE, CTL_EOL); 1784 sysctl_createv(clog, 0, NULL, NULL, 1785 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1786 CTLTYPE_INT, "temppltime", 1787 SYSCTL_DESCR("preferred lifetime of a temporary address"), 1788 NULL, 0, &ip6_temp_preferred_lifetime, 0, 1789 CTL_NET, PF_INET6, IPPROTO_IPV6, 1790 CTL_CREATE, CTL_EOL); 1791 sysctl_createv(clog, 0, NULL, NULL, 1792 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1793 CTLTYPE_INT, "tempvltime", 1794 SYSCTL_DESCR("valid lifetime of a temporary address"), 1795 NULL, 0, &ip6_temp_valid_lifetime, 0, 1796 CTL_NET, PF_INET6, IPPROTO_IPV6, 1797 CTL_CREATE, CTL_EOL); 1798 sysctl_createv(clog, 0, NULL, NULL, 1799 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1800 CTLTYPE_INT, "maxfrags", 1801 SYSCTL_DESCR("Maximum fragments in reassembly queue"), 1802 NULL, 0, &ip6_maxfrags, 0, 1803 CTL_NET, PF_INET6, IPPROTO_IPV6, 1804 IPV6CTL_MAXFRAGS, CTL_EOL); 1805 sysctl_createv(clog, 0, NULL, NULL, 1806 CTLFLAG_PERMANENT, 1807 CTLTYPE_STRUCT, "stats", 1808 SYSCTL_DESCR("IPv6 statistics"), 1809 NULL, 0, &ip6stat, sizeof(ip6stat), 1810 CTL_NET, PF_INET6, IPPROTO_IPV6, 1811 IPV6CTL_STATS, CTL_EOL); 1812 sysctl_createv(clog, 0, NULL, NULL, 1813 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1814 CTLTYPE_INT, "use_defaultzone", 1815 SYSCTL_DESCR("Whether to use the default scope zones"), 1816 NULL, 0, &ip6_use_defzone, 0, 1817 CTL_NET, PF_INET6, IPPROTO_IPV6, 1818 IPV6CTL_USE_DEFAULTZONE, CTL_EOL); 1819 sysctl_createv(clog, 0, NULL, NULL, 1820 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1821 CTLTYPE_INT, "mcast_pmtu", 1822 SYSCTL_DESCR("Enable pMTU discovery for multicast packet"), 1823 NULL, 0, &ip6_mcast_pmtu, 0, 1824 CTL_NET, PF_INET6, IPPROTO_IPV6, 1825 CTL_CREATE, CTL_EOL); 1826 } 1827