ip6_input.c revision 1.104
1 /* $NetBSD: ip6_input.c,v 1.104 2007/05/05 21:23:50 yamt 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 1.104 2007/05/05 21:23:50 yamt 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 #ifdef FAST_IPSEC 116 #include <netipsec/ipsec.h> 117 #include <netipsec/ipsec6.h> 118 #include <netipsec/key.h> 119 #endif /* FAST_IPSEC */ 120 121 #include <netinet6/ip6protosw.h> 122 123 #include "faith.h" 124 #include "gif.h" 125 126 #if NGIF > 0 127 #include <netinet6/in6_gif.h> 128 #endif 129 130 #include <net/net_osdep.h> 131 132 extern struct domain inet6domain; 133 134 u_char ip6_protox[IPPROTO_MAX]; 135 static int ip6qmaxlen = IFQ_MAXLEN; 136 struct in6_ifaddr *in6_ifaddr; 137 struct ifqueue ip6intrq; 138 139 extern struct callout in6_tmpaddrtimer_ch; 140 141 int ip6_forward_srcrt; /* XXX */ 142 int ip6_sourcecheck; /* XXX */ 143 int ip6_sourcecheck_interval; /* XXX */ 144 145 #ifdef PFIL_HOOKS 146 struct pfil_head inet6_pfil_hook; 147 #endif 148 149 struct ip6stat ip6stat; 150 151 static void ip6_init2 __P((void *)); 152 static struct m_tag *ip6_setdstifaddr __P((struct mbuf *, struct in6_ifaddr *)); 153 154 static int ip6_hopopts_input __P((u_int32_t *, u_int32_t *, struct mbuf **, int *)); 155 static struct mbuf *ip6_pullexthdr __P((struct mbuf *, size_t, int)); 156 157 /* 158 * IP6 initialization: fill in IP6 protocol switch table. 159 * All protocols not implemented in kernel go to raw IP6 protocol handler. 160 */ 161 void 162 ip6_init() 163 { 164 const struct ip6protosw *pr; 165 int i; 166 167 pr = (const struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 168 if (pr == 0) 169 panic("ip6_init"); 170 for (i = 0; i < IPPROTO_MAX; i++) 171 ip6_protox[i] = pr - inet6sw; 172 for (pr = (const struct ip6protosw *)inet6domain.dom_protosw; 173 pr < (const struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++) 174 if (pr->pr_domain->dom_family == PF_INET6 && 175 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) 176 ip6_protox[pr->pr_protocol] = pr - inet6sw; 177 ip6intrq.ifq_maxlen = ip6qmaxlen; 178 scope6_init(); 179 addrsel_policy_init(); 180 nd6_init(); 181 frag6_init(); 182 ip6_desync_factor = arc4random() % MAX_TEMP_DESYNC_FACTOR; 183 184 ip6_init2((void *)0); 185 #ifdef GATEWAY 186 ip6flow_init(ip6_hashsize); 187 #endif 188 189 #ifdef PFIL_HOOKS 190 /* Register our Packet Filter hook. */ 191 inet6_pfil_hook.ph_type = PFIL_TYPE_AF; 192 inet6_pfil_hook.ph_af = AF_INET6; 193 i = pfil_head_register(&inet6_pfil_hook); 194 if (i != 0) 195 printf("ip6_init: WARNING: unable to register pfil hook, " 196 "error %d\n", i); 197 #endif /* PFIL_HOOKS */ 198 } 199 200 static void 201 ip6_init2(void *dummy) 202 { 203 204 /* nd6_timer_init */ 205 callout_init(&nd6_timer_ch); 206 callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL); 207 208 /* timer for regeneranation of temporary addresses randomize ID */ 209 callout_init(&in6_tmpaddrtimer_ch); 210 callout_reset(&in6_tmpaddrtimer_ch, 211 (ip6_temp_preferred_lifetime - ip6_desync_factor - 212 ip6_temp_regen_advance) * hz, 213 in6_tmpaddrtimer, NULL); 214 } 215 216 /* 217 * IP6 input interrupt handling. Just pass the packet to ip6_input. 218 */ 219 void 220 ip6intr() 221 { 222 int s; 223 struct mbuf *m; 224 225 for (;;) { 226 s = splnet(); 227 IF_DEQUEUE(&ip6intrq, m); 228 splx(s); 229 if (m == 0) 230 return; 231 /* drop the packet if IPv6 operation is disabled on the IF */ 232 if ((ND_IFINFO(m->m_pkthdr.rcvif)->flags & ND6_IFF_IFDISABLED)) { 233 m_freem(m); 234 return; 235 } 236 ip6_input(m); 237 } 238 } 239 240 extern struct route ip6_forward_rt; 241 242 void 243 ip6_input(struct mbuf *m) 244 { 245 struct ip6_hdr *ip6; 246 int off = sizeof(struct ip6_hdr), nest; 247 u_int32_t plen; 248 u_int32_t rtalert = ~0; 249 int nxt, ours = 0, rh_present = 0; 250 struct ifnet *deliverifp = NULL; 251 int srcrt = 0; 252 const struct sockaddr_in6 *cdst; 253 #ifdef FAST_IPSEC 254 struct m_tag *mtag; 255 struct tdb_ident *tdbi; 256 struct secpolicy *sp; 257 int s, error; 258 #endif 259 260 #ifdef IPSEC 261 /* 262 * should the inner packet be considered authentic? 263 * see comment in ah4_input(). 264 */ 265 m->m_flags &= ~M_AUTHIPHDR; 266 m->m_flags &= ~M_AUTHIPDGM; 267 #endif 268 269 /* 270 * make sure we don't have onion peering information into m_tag. 271 */ 272 ip6_delaux(m); 273 274 /* 275 * mbuf statistics 276 */ 277 if (m->m_flags & M_EXT) { 278 if (m->m_next) 279 ip6stat.ip6s_mext2m++; 280 else 281 ip6stat.ip6s_mext1++; 282 } else { 283 #define M2MMAX __arraycount(ip6stat.ip6s_m2m) 284 if (m->m_next) { 285 if (m->m_flags & M_LOOP) { 286 ip6stat.ip6s_m2m[lo0ifp->if_index]++; /* XXX */ 287 } else if (m->m_pkthdr.rcvif->if_index < M2MMAX) 288 ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++; 289 else 290 ip6stat.ip6s_m2m[0]++; 291 } else 292 ip6stat.ip6s_m1++; 293 #undef M2MMAX 294 } 295 296 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive); 297 ip6stat.ip6s_total++; 298 299 /* 300 * If the IPv6 header is not aligned, slurp it up into a new 301 * mbuf with space for link headers, in the event we forward 302 * it. Otherwise, if it is aligned, make sure the entire base 303 * IPv6 header is in the first mbuf of the chain. 304 */ 305 if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 306 struct ifnet *inifp = m->m_pkthdr.rcvif; 307 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 308 (max_linkhdr + 3) & ~3)) == NULL) { 309 /* XXXJRT new stat, please */ 310 ip6stat.ip6s_toosmall++; 311 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 312 return; 313 } 314 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 315 struct ifnet *inifp = m->m_pkthdr.rcvif; 316 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 317 ip6stat.ip6s_toosmall++; 318 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 319 return; 320 } 321 } 322 323 ip6 = mtod(m, struct ip6_hdr *); 324 325 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 326 ip6stat.ip6s_badvers++; 327 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 328 goto bad; 329 } 330 331 #if defined(IPSEC) 332 /* IPv6 fast forwarding is not compatible with IPsec. */ 333 m->m_flags &= ~M_CANFASTFWD; 334 #else 335 /* 336 * Assume that we can create a fast-forward IP flow entry 337 * based on this packet. 338 */ 339 m->m_flags |= M_CANFASTFWD; 340 #endif 341 342 #ifdef PFIL_HOOKS 343 /* 344 * Run through list of hooks for input packets. If there are any 345 * filters which require that additional packets in the flow are 346 * not fast-forwarded, they must clear the M_CANFASTFWD flag. 347 * Note that filters must _never_ set this flag, as another filter 348 * in the list may have previously cleared it. 349 */ 350 /* 351 * let ipfilter look at packet on the wire, 352 * not the decapsulated packet. 353 */ 354 #ifdef IPSEC 355 if (!ipsec_getnhist(m)) 356 #elif defined(FAST_IPSEC) 357 if (!ipsec_indone(m)) 358 #else 359 if (1) 360 #endif 361 { 362 struct in6_addr odst; 363 364 odst = ip6->ip6_dst; 365 if (pfil_run_hooks(&inet6_pfil_hook, &m, m->m_pkthdr.rcvif, 366 PFIL_IN) != 0) 367 return; 368 if (m == NULL) 369 return; 370 ip6 = mtod(m, struct ip6_hdr *); 371 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst); 372 } 373 #endif /* PFIL_HOOKS */ 374 375 ip6stat.ip6s_nxthist[ip6->ip6_nxt]++; 376 377 #ifdef ALTQ 378 if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) { 379 /* packet is dropped by traffic conditioner */ 380 return; 381 } 382 #endif 383 384 /* 385 * Check against address spoofing/corruption. 386 */ 387 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) || 388 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) { 389 /* 390 * XXX: "badscope" is not very suitable for a multicast source. 391 */ 392 ip6stat.ip6s_badscope++; 393 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 394 goto bad; 395 } 396 /* 397 * The following check is not documented in specs. A malicious 398 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack 399 * and bypass security checks (act as if it was from 127.0.0.1 by using 400 * IPv6 src ::ffff:127.0.0.1). Be cautious. 401 * 402 * This check chokes if we are in an SIIT cloud. As none of BSDs 403 * support IPv4-less kernel compilation, we cannot support SIIT 404 * environment at all. So, it makes more sense for us to reject any 405 * malicious packets for non-SIIT environment, than try to do a 406 * partial support for SIIT environment. 407 */ 408 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 409 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 410 ip6stat.ip6s_badscope++; 411 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 412 goto bad; 413 } 414 #if 0 415 /* 416 * Reject packets with IPv4 compatible addresses (auto tunnel). 417 * 418 * The code forbids auto tunnel relay case in RFC1933 (the check is 419 * stronger than RFC1933). We may want to re-enable it if mech-xx 420 * is revised to forbid relaying case. 421 */ 422 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) || 423 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) { 424 ip6stat.ip6s_badscope++; 425 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 426 goto bad; 427 } 428 #endif 429 430 /* 431 * Disambiguate address scope zones (if there is ambiguity). 432 * We first make sure that the original source or destination address 433 * is not in our internal form for scoped addresses. Such addresses 434 * are not necessarily invalid spec-wise, but we cannot accept them due 435 * to the usage conflict. 436 * in6_setscope() then also checks and rejects the cases where src or 437 * dst are the loopback address and the receiving interface 438 * is not loopback. 439 */ 440 if (__predict_false( 441 m_makewritable(&m, 0, sizeof(struct ip6_hdr), M_DONTWAIT))) 442 goto bad; 443 ip6 = mtod(m, struct ip6_hdr *); 444 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) { 445 ip6stat.ip6s_badscope++; /* XXX */ 446 goto bad; 447 } 448 if (in6_setscope(&ip6->ip6_src, m->m_pkthdr.rcvif, NULL) || 449 in6_setscope(&ip6->ip6_dst, m->m_pkthdr.rcvif, NULL)) { 450 ip6stat.ip6s_badscope++; 451 goto bad; 452 } 453 454 /* 455 * Multicast check 456 */ 457 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 458 struct in6_multi *in6m = 0; 459 460 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast); 461 /* 462 * See if we belong to the destination multicast group on the 463 * arrival interface. 464 */ 465 IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m); 466 if (in6m) 467 ours = 1; 468 else if (!ip6_mrouter) { 469 ip6stat.ip6s_notmember++; 470 ip6stat.ip6s_cantforward++; 471 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 472 goto bad; 473 } 474 deliverifp = m->m_pkthdr.rcvif; 475 goto hbhcheck; 476 } 477 478 cdst = satocsin6(rtcache_getdst(&ip6_forward_rt)); 479 /* 480 * Unicast check 481 */ 482 if (cdst == NULL) 483 ; 484 else if (!IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &cdst->sin6_addr)) 485 rtcache_free(&ip6_forward_rt); 486 else 487 rtcache_check(&ip6_forward_rt); 488 if (ip6_forward_rt.ro_rt != NULL) { 489 /* XXX Revalidated route is accounted wrongly. */ 490 ip6stat.ip6s_forward_cachehit++; 491 } else { 492 union { 493 struct sockaddr dst; 494 struct sockaddr_in6 dst6; 495 } u; 496 497 ip6stat.ip6s_forward_cachemiss++; 498 499 sockaddr_in6_init(&u.dst6, &ip6->ip6_dst, 0, 0, 0); 500 rtcache_setdst(&ip6_forward_rt, &u.dst); 501 502 rtcache_init(&ip6_forward_rt); 503 } 504 505 #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key)) 506 507 /* 508 * Accept the packet if the forwarding interface to the destination 509 * according to the routing table is the loopback interface, 510 * unless the associated route has a gateway. 511 * Note that this approach causes to accept a packet if there is a 512 * route to the loopback interface for the destination of the packet. 513 * But we think it's even useful in some situations, e.g. when using 514 * a special daemon which wants to intercept the packet. 515 */ 516 if (ip6_forward_rt.ro_rt != NULL && 517 (ip6_forward_rt.ro_rt->rt_flags & 518 (RTF_HOST|RTF_GATEWAY)) == RTF_HOST && 519 !(ip6_forward_rt.ro_rt->rt_flags & RTF_CLONED) && 520 #if 0 521 /* 522 * The check below is redundant since the comparison of 523 * the destination and the key of the rtentry has 524 * already done through looking up the routing table. 525 */ 526 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 527 &rt6_key(ip6_forward_rt.ro_rt)->sin6_addr) && 528 #endif 529 ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) { 530 struct in6_ifaddr *ia6 = 531 (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa; 532 if (ia6->ia6_flags & IN6_IFF_ANYCAST) 533 m->m_flags |= M_ANYCAST6; 534 /* 535 * packets to a tentative, duplicated, or somehow invalid 536 * address must not be accepted. 537 */ 538 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) { 539 /* this address is ready */ 540 ours = 1; 541 deliverifp = ia6->ia_ifp; /* correct? */ 542 goto hbhcheck; 543 } else { 544 /* address is not ready, so discard the packet. */ 545 nd6log((LOG_INFO, 546 "ip6_input: packet to an unready address %s->%s\n", 547 ip6_sprintf(&ip6->ip6_src), 548 ip6_sprintf(&ip6->ip6_dst))); 549 550 goto bad; 551 } 552 } 553 554 /* 555 * FAITH (Firewall Aided Internet Translator) 556 */ 557 #if defined(NFAITH) && 0 < NFAITH 558 if (ip6_keepfaith) { 559 if (ip6_forward_rt.ro_rt != NULL && 560 ip6_forward_rt.ro_rt->rt_ifp != NULL && 561 ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) { 562 /* XXX do we need more sanity checks? */ 563 ours = 1; 564 deliverifp = ip6_forward_rt.ro_rt->rt_ifp; /* faith */ 565 goto hbhcheck; 566 } 567 } 568 #endif 569 570 #if 0 571 { 572 /* 573 * Last resort: check in6_ifaddr for incoming interface. 574 * The code is here until I update the "goto ours hack" code above 575 * working right. 576 */ 577 struct ifaddr *ifa; 578 TAILQ_FOREACH(ifa, &m->m_pkthdr.rcvif->if_addrlist, ifa_list) { 579 if (ifa->ifa_addr == NULL) 580 continue; /* just for safety */ 581 if (ifa->ifa_addr->sa_family != AF_INET6) 582 continue; 583 if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) { 584 ours = 1; 585 deliverifp = ifa->ifa_ifp; 586 goto hbhcheck; 587 } 588 } 589 } 590 #endif 591 592 /* 593 * Now there is no reason to process the packet if it's not our own 594 * and we're not a router. 595 */ 596 if (!ip6_forwarding) { 597 ip6stat.ip6s_cantforward++; 598 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 599 goto bad; 600 } 601 602 hbhcheck: 603 /* 604 * record address information into m_tag, if we don't have one yet. 605 * note that we are unable to record it, if the address is not listed 606 * as our interface address (e.g. multicast addresses, addresses 607 * within FAITH prefixes and such). 608 */ 609 if (deliverifp && !ip6_getdstifaddr(m)) { 610 struct in6_ifaddr *ia6; 611 612 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 613 if (ia6) { 614 if (!ip6_setdstifaddr(m, ia6)) { 615 /* 616 * XXX maybe we should drop the packet here, 617 * as we could not provide enough information 618 * to the upper layers. 619 */ 620 } 621 } 622 } 623 624 /* 625 * Process Hop-by-Hop options header if it's contained. 626 * m may be modified in ip6_hopopts_input(). 627 * If a JumboPayload option is included, plen will also be modified. 628 */ 629 plen = (u_int32_t)ntohs(ip6->ip6_plen); 630 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 631 struct ip6_hbh *hbh; 632 633 if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) { 634 #if 0 /*touches NULL pointer*/ 635 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 636 #endif 637 return; /* m have already been freed */ 638 } 639 640 /* adjust pointer */ 641 ip6 = mtod(m, struct ip6_hdr *); 642 643 /* 644 * if the payload length field is 0 and the next header field 645 * indicates Hop-by-Hop Options header, then a Jumbo Payload 646 * option MUST be included. 647 */ 648 if (ip6->ip6_plen == 0 && plen == 0) { 649 /* 650 * Note that if a valid jumbo payload option is 651 * contained, ip6_hopopts_input() must set a valid 652 * (non-zero) payload length to the variable plen. 653 */ 654 ip6stat.ip6s_badoptions++; 655 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 656 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 657 icmp6_error(m, ICMP6_PARAM_PROB, 658 ICMP6_PARAMPROB_HEADER, 659 (char *)&ip6->ip6_plen - (char *)ip6); 660 return; 661 } 662 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 663 sizeof(struct ip6_hbh)); 664 if (hbh == NULL) { 665 ip6stat.ip6s_tooshort++; 666 return; 667 } 668 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 669 nxt = hbh->ip6h_nxt; 670 671 /* 672 * accept the packet if a router alert option is included 673 * and we act as an IPv6 router. 674 */ 675 if (rtalert != ~0 && ip6_forwarding) 676 ours = 1; 677 } else 678 nxt = ip6->ip6_nxt; 679 680 /* 681 * Check that the amount of data in the buffers 682 * is as at least much as the IPv6 header would have us expect. 683 * Trim mbufs if longer than we expect. 684 * Drop packet if shorter than we expect. 685 */ 686 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 687 ip6stat.ip6s_tooshort++; 688 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 689 goto bad; 690 } 691 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 692 if (m->m_len == m->m_pkthdr.len) { 693 m->m_len = sizeof(struct ip6_hdr) + plen; 694 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 695 } else 696 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 697 } 698 699 /* 700 * Forward if desirable. 701 */ 702 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 703 /* 704 * If we are acting as a multicast router, all 705 * incoming multicast packets are passed to the 706 * kernel-level multicast forwarding function. 707 * The packet is returned (relatively) intact; if 708 * ip6_mforward() returns a non-zero value, the packet 709 * must be discarded, else it may be accepted below. 710 */ 711 if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) { 712 ip6stat.ip6s_cantforward++; 713 m_freem(m); 714 return; 715 } 716 if (!ours) { 717 m_freem(m); 718 return; 719 } 720 } else if (!ours) { 721 ip6_forward(m, srcrt); 722 return; 723 } 724 725 ip6 = mtod(m, struct ip6_hdr *); 726 727 /* 728 * Malicious party may be able to use IPv4 mapped addr to confuse 729 * tcp/udp stack and bypass security checks (act as if it was from 730 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious. 731 * 732 * For SIIT end node behavior, you may want to disable the check. 733 * However, you will become vulnerable to attacks using IPv4 mapped 734 * source. 735 */ 736 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 737 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 738 ip6stat.ip6s_badscope++; 739 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 740 goto bad; 741 } 742 743 /* 744 * Tell launch routine the next header 745 */ 746 #ifdef IFA_STATS 747 if (deliverifp != NULL) { 748 struct in6_ifaddr *ia6; 749 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 750 if (ia6) 751 ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len; 752 } 753 #endif 754 ip6stat.ip6s_delivered++; 755 in6_ifstat_inc(deliverifp, ifs6_in_deliver); 756 nest = 0; 757 758 rh_present = 0; 759 while (nxt != IPPROTO_DONE) { 760 if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) { 761 ip6stat.ip6s_toomanyhdr++; 762 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 763 goto bad; 764 } 765 766 /* 767 * protection against faulty packet - there should be 768 * more sanity checks in header chain processing. 769 */ 770 if (m->m_pkthdr.len < off) { 771 ip6stat.ip6s_tooshort++; 772 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 773 goto bad; 774 } 775 776 if (nxt == IPPROTO_ROUTING) { 777 if (rh_present++) { 778 in6_ifstat_inc(m->m_pkthdr.rcvif, 779 ifs6_in_hdrerr); 780 ip6stat.ip6s_badoptions++; 781 goto bad; 782 } 783 } 784 785 #ifdef IPSEC 786 /* 787 * enforce IPsec policy checking if we are seeing last header. 788 * note that we do not visit this with protocols with pcb layer 789 * code - like udp/tcp/raw ip. 790 */ 791 if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 && 792 ipsec6_in_reject(m, NULL)) { 793 ipsec6stat.in_polvio++; 794 goto bad; 795 } 796 #endif 797 #ifdef FAST_IPSEC 798 /* 799 * enforce IPsec policy checking if we are seeing last header. 800 * note that we do not visit this with protocols with pcb layer 801 * code - like udp/tcp/raw ip. 802 */ 803 if ((inet6sw[ip_protox[nxt]].pr_flags & PR_LASTHDR) != 0) { 804 /* 805 * Check if the packet has already had IPsec processing 806 * done. If so, then just pass it along. This tag gets 807 * set during AH, ESP, etc. input handling, before the 808 * packet is returned to the ip input queue for delivery. 809 */ 810 mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL); 811 s = splsoftnet(); 812 if (mtag != NULL) { 813 tdbi = (struct tdb_ident *)(mtag + 1); 814 sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND); 815 } else { 816 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, 817 IP_FORWARDING, &error); 818 } 819 if (sp != NULL) { 820 /* 821 * Check security policy against packet attributes. 822 */ 823 error = ipsec_in_reject(sp, m); 824 KEY_FREESP(&sp); 825 } else { 826 /* XXX error stat??? */ 827 error = EINVAL; 828 DPRINTF(("ip6_input: no SP, packet discarded\n"));/*XXX*/ 829 goto bad; 830 } 831 splx(s); 832 if (error) 833 goto bad; 834 } 835 #endif /* FAST_IPSEC */ 836 837 838 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt); 839 } 840 return; 841 bad: 842 m_freem(m); 843 } 844 845 /* 846 * set/grab in6_ifaddr correspond to IPv6 destination address. 847 */ 848 static struct m_tag * 849 ip6_setdstifaddr(m, ia6) 850 struct mbuf *m; 851 struct in6_ifaddr *ia6; 852 { 853 struct m_tag *mtag; 854 855 mtag = ip6_addaux(m); 856 if (mtag) 857 ((struct ip6aux *)(mtag + 1))->ip6a_dstia6 = ia6; 858 return mtag; /* NULL if failed to set */ 859 } 860 861 struct in6_ifaddr * 862 ip6_getdstifaddr(m) 863 struct mbuf *m; 864 { 865 struct m_tag *mtag; 866 867 mtag = ip6_findaux(m); 868 if (mtag) 869 return ((struct ip6aux *)(mtag + 1))->ip6a_dstia6; 870 else 871 return NULL; 872 } 873 874 /* 875 * Hop-by-Hop options header processing. If a valid jumbo payload option is 876 * included, the real payload length will be stored in plenp. 877 */ 878 static int 879 ip6_hopopts_input(plenp, rtalertp, mp, offp) 880 u_int32_t *plenp; 881 u_int32_t *rtalertp; /* XXX: should be stored more smart way */ 882 struct mbuf **mp; 883 int *offp; 884 { 885 struct mbuf *m = *mp; 886 int off = *offp, hbhlen; 887 struct ip6_hbh *hbh; 888 889 /* validation of the length of the header */ 890 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, 891 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh)); 892 if (hbh == NULL) { 893 ip6stat.ip6s_tooshort++; 894 return -1; 895 } 896 hbhlen = (hbh->ip6h_len + 1) << 3; 897 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 898 hbhlen); 899 if (hbh == NULL) { 900 ip6stat.ip6s_tooshort++; 901 return -1; 902 } 903 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 904 off += hbhlen; 905 hbhlen -= sizeof(struct ip6_hbh); 906 907 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 908 hbhlen, rtalertp, plenp) < 0) 909 return (-1); 910 911 *offp = off; 912 *mp = m; 913 return (0); 914 } 915 916 /* 917 * Search header for all Hop-by-hop options and process each option. 918 * This function is separate from ip6_hopopts_input() in order to 919 * handle a case where the sending node itself process its hop-by-hop 920 * options header. In such a case, the function is called from ip6_output(). 921 * 922 * The function assumes that hbh header is located right after the IPv6 header 923 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to 924 * opthead + hbhlen is located in continuous memory region. 925 */ 926 int 927 ip6_process_hopopts(m, opthead, hbhlen, rtalertp, plenp) 928 struct mbuf *m; 929 u_int8_t *opthead; 930 int hbhlen; 931 u_int32_t *rtalertp; 932 u_int32_t *plenp; 933 { 934 struct ip6_hdr *ip6; 935 int optlen = 0; 936 u_int8_t *opt = opthead; 937 u_int16_t rtalert_val; 938 u_int32_t jumboplen; 939 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh); 940 941 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 942 switch (*opt) { 943 case IP6OPT_PAD1: 944 optlen = 1; 945 break; 946 case IP6OPT_PADN: 947 if (hbhlen < IP6OPT_MINLEN) { 948 ip6stat.ip6s_toosmall++; 949 goto bad; 950 } 951 optlen = *(opt + 1) + 2; 952 break; 953 case IP6OPT_RTALERT: 954 /* XXX may need check for alignment */ 955 if (hbhlen < IP6OPT_RTALERT_LEN) { 956 ip6stat.ip6s_toosmall++; 957 goto bad; 958 } 959 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) { 960 /* XXX stat */ 961 icmp6_error(m, ICMP6_PARAM_PROB, 962 ICMP6_PARAMPROB_HEADER, 963 erroff + opt + 1 - opthead); 964 return (-1); 965 } 966 optlen = IP6OPT_RTALERT_LEN; 967 bcopy((void *)(opt + 2), (void *)&rtalert_val, 2); 968 *rtalertp = ntohs(rtalert_val); 969 break; 970 case IP6OPT_JUMBO: 971 /* XXX may need check for alignment */ 972 if (hbhlen < IP6OPT_JUMBO_LEN) { 973 ip6stat.ip6s_toosmall++; 974 goto bad; 975 } 976 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) { 977 /* XXX stat */ 978 icmp6_error(m, ICMP6_PARAM_PROB, 979 ICMP6_PARAMPROB_HEADER, 980 erroff + opt + 1 - opthead); 981 return (-1); 982 } 983 optlen = IP6OPT_JUMBO_LEN; 984 985 /* 986 * IPv6 packets that have non 0 payload length 987 * must not contain a jumbo payload option. 988 */ 989 ip6 = mtod(m, struct ip6_hdr *); 990 if (ip6->ip6_plen) { 991 ip6stat.ip6s_badoptions++; 992 icmp6_error(m, ICMP6_PARAM_PROB, 993 ICMP6_PARAMPROB_HEADER, 994 erroff + opt - opthead); 995 return (-1); 996 } 997 998 /* 999 * We may see jumbolen in unaligned location, so 1000 * we'd need to perform bcopy(). 1001 */ 1002 bcopy(opt + 2, &jumboplen, sizeof(jumboplen)); 1003 jumboplen = (u_int32_t)htonl(jumboplen); 1004 1005 #if 1 1006 /* 1007 * if there are multiple jumbo payload options, 1008 * *plenp will be non-zero and the packet will be 1009 * rejected. 1010 * the behavior may need some debate in ipngwg - 1011 * multiple options does not make sense, however, 1012 * there's no explicit mention in specification. 1013 */ 1014 if (*plenp != 0) { 1015 ip6stat.ip6s_badoptions++; 1016 icmp6_error(m, ICMP6_PARAM_PROB, 1017 ICMP6_PARAMPROB_HEADER, 1018 erroff + opt + 2 - opthead); 1019 return (-1); 1020 } 1021 #endif 1022 1023 /* 1024 * jumbo payload length must be larger than 65535. 1025 */ 1026 if (jumboplen <= IPV6_MAXPACKET) { 1027 ip6stat.ip6s_badoptions++; 1028 icmp6_error(m, ICMP6_PARAM_PROB, 1029 ICMP6_PARAMPROB_HEADER, 1030 erroff + opt + 2 - opthead); 1031 return (-1); 1032 } 1033 *plenp = jumboplen; 1034 1035 break; 1036 default: /* unknown option */ 1037 if (hbhlen < IP6OPT_MINLEN) { 1038 ip6stat.ip6s_toosmall++; 1039 goto bad; 1040 } 1041 optlen = ip6_unknown_opt(opt, m, 1042 erroff + opt - opthead); 1043 if (optlen == -1) 1044 return (-1); 1045 optlen += 2; 1046 break; 1047 } 1048 } 1049 1050 return (0); 1051 1052 bad: 1053 m_freem(m); 1054 return (-1); 1055 } 1056 1057 /* 1058 * Unknown option processing. 1059 * The third argument `off' is the offset from the IPv6 header to the option, 1060 * which is necessary if the IPv6 header the and option header and IPv6 header 1061 * is not continuous in order to return an ICMPv6 error. 1062 */ 1063 int 1064 ip6_unknown_opt(optp, m, off) 1065 u_int8_t *optp; 1066 struct mbuf *m; 1067 int off; 1068 { 1069 struct ip6_hdr *ip6; 1070 1071 switch (IP6OPT_TYPE(*optp)) { 1072 case IP6OPT_TYPE_SKIP: /* ignore the option */ 1073 return ((int)*(optp + 1)); 1074 case IP6OPT_TYPE_DISCARD: /* silently discard */ 1075 m_freem(m); 1076 return (-1); 1077 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 1078 ip6stat.ip6s_badoptions++; 1079 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 1080 return (-1); 1081 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 1082 ip6stat.ip6s_badoptions++; 1083 ip6 = mtod(m, struct ip6_hdr *); 1084 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 1085 (m->m_flags & (M_BCAST|M_MCAST))) 1086 m_freem(m); 1087 else 1088 icmp6_error(m, ICMP6_PARAM_PROB, 1089 ICMP6_PARAMPROB_OPTION, off); 1090 return (-1); 1091 } 1092 1093 m_freem(m); /* XXX: NOTREACHED */ 1094 return (-1); 1095 } 1096 1097 /* 1098 * Create the "control" list for this pcb. 1099 * 1100 * The routine will be called from upper layer handlers like tcp6_input(). 1101 * Thus the routine assumes that the caller (tcp6_input) have already 1102 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the 1103 * very first mbuf on the mbuf chain. 1104 * We may want to add some infinite loop prevention or sanity checks for safety. 1105 * (This applies only when you are using KAME mbuf chain restriction, i.e. 1106 * you are using IP6_EXTHDR_CHECK() not m_pulldown()) 1107 */ 1108 void 1109 ip6_savecontrol(in6p, mp, ip6, m) 1110 struct in6pcb *in6p; 1111 struct mbuf **mp; 1112 struct ip6_hdr *ip6; 1113 struct mbuf *m; 1114 { 1115 #ifdef RFC2292 1116 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y)) 1117 #else 1118 #define IS2292(x, y) (y) 1119 #endif 1120 1121 #ifdef SO_TIMESTAMP 1122 if (in6p->in6p_socket->so_options & SO_TIMESTAMP) { 1123 struct timeval tv; 1124 1125 microtime(&tv); 1126 *mp = sbcreatecontrol((void *) &tv, sizeof(tv), 1127 SCM_TIMESTAMP, SOL_SOCKET); 1128 if (*mp) 1129 mp = &(*mp)->m_next; 1130 } 1131 #endif 1132 1133 /* some OSes call this logic with IPv4 packet, for SO_TIMESTAMP */ 1134 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) 1135 return; 1136 1137 /* RFC 2292 sec. 5 */ 1138 if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) { 1139 struct in6_pktinfo pi6; 1140 1141 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr)); 1142 in6_clearscope(&pi6.ipi6_addr); /* XXX */ 1143 pi6.ipi6_ifindex = m->m_pkthdr.rcvif ? 1144 m->m_pkthdr.rcvif->if_index : 0; 1145 *mp = sbcreatecontrol((void *) &pi6, 1146 sizeof(struct in6_pktinfo), 1147 IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6); 1148 if (*mp) 1149 mp = &(*mp)->m_next; 1150 } 1151 1152 if (in6p->in6p_flags & IN6P_HOPLIMIT) { 1153 int hlim = ip6->ip6_hlim & 0xff; 1154 1155 *mp = sbcreatecontrol((void *) &hlim, sizeof(int), 1156 IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6); 1157 if (*mp) 1158 mp = &(*mp)->m_next; 1159 } 1160 1161 if ((in6p->in6p_flags & IN6P_TCLASS) != 0) { 1162 u_int32_t flowinfo; 1163 int tclass; 1164 1165 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK); 1166 flowinfo >>= 20; 1167 1168 tclass = flowinfo & 0xff; 1169 *mp = sbcreatecontrol((void *)&tclass, sizeof(tclass), 1170 IPV6_TCLASS, IPPROTO_IPV6); 1171 1172 if (*mp) 1173 mp = &(*mp)->m_next; 1174 } 1175 1176 /* 1177 * IPV6_HOPOPTS socket option. Recall that we required super-user 1178 * privilege for the option (see ip6_ctloutput), but it might be too 1179 * strict, since there might be some hop-by-hop options which can be 1180 * returned to normal user. 1181 * See also RFC3542 section 8 (or RFC2292 section 6). 1182 */ 1183 if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0) { 1184 /* 1185 * Check if a hop-by-hop options header is contatined in the 1186 * received packet, and if so, store the options as ancillary 1187 * data. Note that a hop-by-hop options header must be 1188 * just after the IPv6 header, which fact is assured through 1189 * the IPv6 input processing. 1190 */ 1191 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1192 if (xip6->ip6_nxt == IPPROTO_HOPOPTS) { 1193 struct ip6_hbh *hbh; 1194 int hbhlen; 1195 struct mbuf *ext; 1196 1197 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr), 1198 xip6->ip6_nxt); 1199 if (ext == NULL) { 1200 ip6stat.ip6s_tooshort++; 1201 return; 1202 } 1203 hbh = mtod(ext, struct ip6_hbh *); 1204 hbhlen = (hbh->ip6h_len + 1) << 3; 1205 if (hbhlen != ext->m_len) { 1206 m_freem(ext); 1207 ip6stat.ip6s_tooshort++; 1208 return; 1209 } 1210 1211 /* 1212 * XXX: We copy whole the header even if a jumbo 1213 * payload option is included, which option is to 1214 * be removed before returning in the RFC 2292. 1215 * Note: this constraint is removed in RFC3542. 1216 */ 1217 *mp = sbcreatecontrol((void *)hbh, hbhlen, 1218 IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS), 1219 IPPROTO_IPV6); 1220 if (*mp) 1221 mp = &(*mp)->m_next; 1222 m_freem(ext); 1223 } 1224 } 1225 1226 /* IPV6_DSTOPTS and IPV6_RTHDR socket options */ 1227 if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) { 1228 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1229 int nxt = xip6->ip6_nxt, off = sizeof(struct ip6_hdr); 1230 1231 /* 1232 * Search for destination options headers or routing 1233 * header(s) through the header chain, and stores each 1234 * header as ancillary data. 1235 * Note that the order of the headers remains in 1236 * the chain of ancillary data. 1237 */ 1238 for (;;) { /* is explicit loop prevention necessary? */ 1239 struct ip6_ext *ip6e = NULL; 1240 int elen; 1241 struct mbuf *ext = NULL; 1242 1243 /* 1244 * if it is not an extension header, don't try to 1245 * pull it from the chain. 1246 */ 1247 switch (nxt) { 1248 case IPPROTO_DSTOPTS: 1249 case IPPROTO_ROUTING: 1250 case IPPROTO_HOPOPTS: 1251 case IPPROTO_AH: /* is it possible? */ 1252 break; 1253 default: 1254 goto loopend; 1255 } 1256 1257 ext = ip6_pullexthdr(m, off, nxt); 1258 if (ext == NULL) { 1259 ip6stat.ip6s_tooshort++; 1260 return; 1261 } 1262 ip6e = mtod(ext, struct ip6_ext *); 1263 if (nxt == IPPROTO_AH) 1264 elen = (ip6e->ip6e_len + 2) << 2; 1265 else 1266 elen = (ip6e->ip6e_len + 1) << 3; 1267 if (elen != ext->m_len) { 1268 m_freem(ext); 1269 ip6stat.ip6s_tooshort++; 1270 return; 1271 } 1272 KASSERT(IP6_HDR_ALIGNED_P(ip6e)); 1273 1274 switch (nxt) { 1275 case IPPROTO_DSTOPTS: 1276 if (!in6p->in6p_flags & IN6P_DSTOPTS) 1277 break; 1278 1279 *mp = sbcreatecontrol((void *)ip6e, elen, 1280 IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS), 1281 IPPROTO_IPV6); 1282 if (*mp) 1283 mp = &(*mp)->m_next; 1284 break; 1285 1286 case IPPROTO_ROUTING: 1287 if (!in6p->in6p_flags & IN6P_RTHDR) 1288 break; 1289 1290 *mp = sbcreatecontrol((void *)ip6e, elen, 1291 IS2292(IPV6_2292RTHDR, IPV6_RTHDR), 1292 IPPROTO_IPV6); 1293 if (*mp) 1294 mp = &(*mp)->m_next; 1295 break; 1296 1297 case IPPROTO_HOPOPTS: 1298 case IPPROTO_AH: /* is it possible? */ 1299 break; 1300 1301 default: 1302 /* 1303 * other cases have been filtered in the above. 1304 * none will visit this case. here we supply 1305 * the code just in case (nxt overwritten or 1306 * other cases). 1307 */ 1308 m_freem(ext); 1309 goto loopend; 1310 1311 } 1312 1313 /* proceed with the next header. */ 1314 off += elen; 1315 nxt = ip6e->ip6e_nxt; 1316 ip6e = NULL; 1317 m_freem(ext); 1318 ext = NULL; 1319 } 1320 loopend: 1321 ; 1322 } 1323 } 1324 #undef IS2292 1325 1326 1327 void 1328 ip6_notify_pmtu(struct in6pcb *in6p, const struct sockaddr_in6 *dst, 1329 uint32_t *mtu) 1330 { 1331 struct socket *so; 1332 struct mbuf *m_mtu; 1333 struct ip6_mtuinfo mtuctl; 1334 1335 so = in6p->in6p_socket; 1336 1337 if (mtu == NULL) 1338 return; 1339 1340 #ifdef DIAGNOSTIC 1341 if (so == NULL) /* I believe this is impossible */ 1342 panic("ip6_notify_pmtu: socket is NULL"); 1343 #endif 1344 1345 memset(&mtuctl, 0, sizeof(mtuctl)); /* zero-clear for safety */ 1346 mtuctl.ip6m_mtu = *mtu; 1347 mtuctl.ip6m_addr = *dst; 1348 if (sa6_recoverscope(&mtuctl.ip6m_addr)) 1349 return; 1350 1351 if ((m_mtu = sbcreatecontrol((void *)&mtuctl, sizeof(mtuctl), 1352 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL) 1353 return; 1354 1355 if (sbappendaddr(&so->so_rcv, (const struct sockaddr *)dst, NULL, m_mtu) 1356 == 0) { 1357 m_freem(m_mtu); 1358 /* XXX: should count statistics */ 1359 } else 1360 sorwakeup(so); 1361 1362 return; 1363 } 1364 1365 /* 1366 * pull single extension header from mbuf chain. returns single mbuf that 1367 * contains the result, or NULL on error. 1368 */ 1369 static struct mbuf * 1370 ip6_pullexthdr(m, off, nxt) 1371 struct mbuf *m; 1372 size_t off; 1373 int nxt; 1374 { 1375 struct ip6_ext ip6e; 1376 size_t elen; 1377 struct mbuf *n; 1378 1379 #ifdef DIAGNOSTIC 1380 switch (nxt) { 1381 case IPPROTO_DSTOPTS: 1382 case IPPROTO_ROUTING: 1383 case IPPROTO_HOPOPTS: 1384 case IPPROTO_AH: /* is it possible? */ 1385 break; 1386 default: 1387 printf("ip6_pullexthdr: invalid nxt=%d\n", nxt); 1388 } 1389 #endif 1390 1391 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1392 if (nxt == IPPROTO_AH) 1393 elen = (ip6e.ip6e_len + 2) << 2; 1394 else 1395 elen = (ip6e.ip6e_len + 1) << 3; 1396 1397 MGET(n, M_DONTWAIT, MT_DATA); 1398 if (n && elen >= MLEN) { 1399 MCLGET(n, M_DONTWAIT); 1400 if ((n->m_flags & M_EXT) == 0) { 1401 m_free(n); 1402 n = NULL; 1403 } 1404 } 1405 if (!n) 1406 return NULL; 1407 1408 n->m_len = 0; 1409 if (elen >= M_TRAILINGSPACE(n)) { 1410 m_free(n); 1411 return NULL; 1412 } 1413 1414 m_copydata(m, off, elen, mtod(n, void *)); 1415 n->m_len = elen; 1416 return n; 1417 } 1418 1419 /* 1420 * Get pointer to the previous header followed by the header 1421 * currently processed. 1422 * XXX: This function supposes that 1423 * M includes all headers, 1424 * the next header field and the header length field of each header 1425 * are valid, and 1426 * the sum of each header length equals to OFF. 1427 * Because of these assumptions, this function must be called very 1428 * carefully. Moreover, it will not be used in the near future when 1429 * we develop `neater' mechanism to process extension headers. 1430 */ 1431 u_int8_t * 1432 ip6_get_prevhdr(m, off) 1433 struct mbuf *m; 1434 int off; 1435 { 1436 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1437 1438 if (off == sizeof(struct ip6_hdr)) 1439 return (&ip6->ip6_nxt); 1440 else { 1441 int len, nxt; 1442 struct ip6_ext *ip6e = NULL; 1443 1444 nxt = ip6->ip6_nxt; 1445 len = sizeof(struct ip6_hdr); 1446 while (len < off) { 1447 ip6e = (struct ip6_ext *)(mtod(m, char *) + len); 1448 1449 switch (nxt) { 1450 case IPPROTO_FRAGMENT: 1451 len += sizeof(struct ip6_frag); 1452 break; 1453 case IPPROTO_AH: 1454 len += (ip6e->ip6e_len + 2) << 2; 1455 break; 1456 default: 1457 len += (ip6e->ip6e_len + 1) << 3; 1458 break; 1459 } 1460 nxt = ip6e->ip6e_nxt; 1461 } 1462 if (ip6e) 1463 return (&ip6e->ip6e_nxt); 1464 else 1465 return NULL; 1466 } 1467 } 1468 1469 /* 1470 * get next header offset. m will be retained. 1471 */ 1472 int 1473 ip6_nexthdr(m, off, proto, nxtp) 1474 struct mbuf *m; 1475 int off; 1476 int proto; 1477 int *nxtp; 1478 { 1479 struct ip6_hdr ip6; 1480 struct ip6_ext ip6e; 1481 struct ip6_frag fh; 1482 1483 /* just in case */ 1484 if (m == NULL) 1485 panic("ip6_nexthdr: m == NULL"); 1486 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off) 1487 return -1; 1488 1489 switch (proto) { 1490 case IPPROTO_IPV6: 1491 /* do not chase beyond intermediate IPv6 headers */ 1492 if (off != 0) 1493 return -1; 1494 if (m->m_pkthdr.len < off + sizeof(ip6)) 1495 return -1; 1496 m_copydata(m, off, sizeof(ip6), (void *)&ip6); 1497 if (nxtp) 1498 *nxtp = ip6.ip6_nxt; 1499 off += sizeof(ip6); 1500 return off; 1501 1502 case IPPROTO_FRAGMENT: 1503 /* 1504 * terminate parsing if it is not the first fragment, 1505 * it does not make sense to parse through it. 1506 */ 1507 if (m->m_pkthdr.len < off + sizeof(fh)) 1508 return -1; 1509 m_copydata(m, off, sizeof(fh), (void *)&fh); 1510 if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0) 1511 return -1; 1512 if (nxtp) 1513 *nxtp = fh.ip6f_nxt; 1514 off += sizeof(struct ip6_frag); 1515 return off; 1516 1517 case IPPROTO_AH: 1518 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1519 return -1; 1520 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1521 if (nxtp) 1522 *nxtp = ip6e.ip6e_nxt; 1523 off += (ip6e.ip6e_len + 2) << 2; 1524 if (m->m_pkthdr.len < off) 1525 return -1; 1526 return off; 1527 1528 case IPPROTO_HOPOPTS: 1529 case IPPROTO_ROUTING: 1530 case IPPROTO_DSTOPTS: 1531 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1532 return -1; 1533 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1534 if (nxtp) 1535 *nxtp = ip6e.ip6e_nxt; 1536 off += (ip6e.ip6e_len + 1) << 3; 1537 if (m->m_pkthdr.len < off) 1538 return -1; 1539 return off; 1540 1541 case IPPROTO_NONE: 1542 case IPPROTO_ESP: 1543 case IPPROTO_IPCOMP: 1544 /* give up */ 1545 return -1; 1546 1547 default: 1548 return -1; 1549 } 1550 } 1551 1552 /* 1553 * get offset for the last header in the chain. m will be kept untainted. 1554 */ 1555 int 1556 ip6_lasthdr(m, off, proto, nxtp) 1557 struct mbuf *m; 1558 int off; 1559 int proto; 1560 int *nxtp; 1561 { 1562 int newoff; 1563 int nxt; 1564 1565 if (!nxtp) { 1566 nxt = -1; 1567 nxtp = &nxt; 1568 } 1569 for (;;) { 1570 newoff = ip6_nexthdr(m, off, proto, nxtp); 1571 if (newoff < 0) 1572 return off; 1573 else if (newoff < off) 1574 return -1; /* invalid */ 1575 else if (newoff == off) 1576 return newoff; 1577 1578 off = newoff; 1579 proto = *nxtp; 1580 } 1581 } 1582 1583 struct m_tag * 1584 ip6_addaux(m) 1585 struct mbuf *m; 1586 { 1587 struct m_tag *mtag; 1588 1589 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1590 if (!mtag) { 1591 mtag = m_tag_get(PACKET_TAG_INET6, sizeof(struct ip6aux), 1592 M_NOWAIT); 1593 if (mtag) { 1594 m_tag_prepend(m, mtag); 1595 bzero(mtag + 1, sizeof(struct ip6aux)); 1596 } 1597 } 1598 return mtag; 1599 } 1600 1601 struct m_tag * 1602 ip6_findaux(m) 1603 struct mbuf *m; 1604 { 1605 struct m_tag *mtag; 1606 1607 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1608 return mtag; 1609 } 1610 1611 void 1612 ip6_delaux(m) 1613 struct mbuf *m; 1614 { 1615 struct m_tag *mtag; 1616 1617 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1618 if (mtag) 1619 m_tag_delete(m, mtag); 1620 } 1621 1622 #ifdef GATEWAY 1623 /* 1624 * sysctl helper routine for net.inet.ip6.maxflows. Since 1625 * we could reduce this value, call ip6flow_reap(); 1626 */ 1627 static int 1628 sysctl_net_inet6_ip6_maxflows(SYSCTLFN_ARGS) 1629 { 1630 int s; 1631 1632 s = sysctl_lookup(SYSCTLFN_CALL(rnode)); 1633 if (s || newp == NULL) 1634 return (s); 1635 1636 s = splsoftnet(); 1637 ip6flow_reap(0); 1638 splx(s); 1639 1640 return (0); 1641 } 1642 1643 static int 1644 sysctl_net_inet6_ip6_hashsize(SYSCTLFN_ARGS) 1645 { 1646 int error, tmp; 1647 struct sysctlnode node; 1648 1649 node = *rnode; 1650 tmp = ip6_hashsize; 1651 node.sysctl_data = &tmp; 1652 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 1653 if (error || newp == NULL) 1654 return (error); 1655 1656 if ((tmp & (tmp - 1)) == 0 && tmp != 0) { 1657 /* 1658 * Can only fail due to malloc() 1659 */ 1660 if (ip6flow_invalidate_all(tmp)) 1661 return ENOMEM; 1662 } else { 1663 /* 1664 * EINVAL if not a power of 2 1665 */ 1666 return EINVAL; 1667 } 1668 1669 return (0); 1670 } 1671 #endif /* GATEWAY */ 1672 1673 static int 1674 sysctl_net_inet6_ip6_rht0(SYSCTLFN_ARGS) 1675 { 1676 int error, tmp; 1677 struct sysctlnode node; 1678 1679 node = *rnode; 1680 tmp = ip6_rht0; 1681 node.sysctl_data = &tmp; 1682 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 1683 if (error || newp == NULL) 1684 return error; 1685 1686 switch (tmp) { 1687 case -1: /* disable processing */ 1688 case 0: /* disable for host, enable for router */ 1689 case 1: /* enable for all */ 1690 break; 1691 default: 1692 return EINVAL; 1693 } 1694 ip6_rht0 = tmp; 1695 return 0; 1696 } 1697 1698 /* 1699 * System control for IP6 1700 */ 1701 1702 u_char inet6ctlerrmap[PRC_NCMDS] = { 1703 0, 0, 0, 0, 1704 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 1705 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 1706 EMSGSIZE, EHOSTUNREACH, 0, 0, 1707 0, 0, 0, 0, 1708 ENOPROTOOPT 1709 }; 1710 1711 SYSCTL_SETUP(sysctl_net_inet6_ip6_setup, "sysctl net.inet6.ip6 subtree setup") 1712 { 1713 #ifdef RFC2292 1714 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y)) 1715 #else 1716 #define IS2292(x, y) (y) 1717 #endif 1718 1719 sysctl_createv(clog, 0, NULL, NULL, 1720 CTLFLAG_PERMANENT, 1721 CTLTYPE_NODE, "net", NULL, 1722 NULL, 0, NULL, 0, 1723 CTL_NET, CTL_EOL); 1724 sysctl_createv(clog, 0, NULL, NULL, 1725 CTLFLAG_PERMANENT, 1726 CTLTYPE_NODE, "inet6", 1727 SYSCTL_DESCR("PF_INET6 related settings"), 1728 NULL, 0, NULL, 0, 1729 CTL_NET, PF_INET6, CTL_EOL); 1730 sysctl_createv(clog, 0, NULL, NULL, 1731 CTLFLAG_PERMANENT, 1732 CTLTYPE_NODE, "ip6", 1733 SYSCTL_DESCR("IPv6 related settings"), 1734 NULL, 0, NULL, 0, 1735 CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_EOL); 1736 1737 sysctl_createv(clog, 0, NULL, NULL, 1738 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1739 CTLTYPE_INT, "forwarding", 1740 SYSCTL_DESCR("Enable forwarding of INET6 datagrams"), 1741 NULL, 0, &ip6_forwarding, 0, 1742 CTL_NET, PF_INET6, IPPROTO_IPV6, 1743 IPV6CTL_FORWARDING, CTL_EOL); 1744 sysctl_createv(clog, 0, NULL, NULL, 1745 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1746 CTLTYPE_INT, "redirect", 1747 SYSCTL_DESCR("Enable sending of ICMPv6 redirect messages"), 1748 NULL, 0, &ip6_sendredirects, 0, 1749 CTL_NET, PF_INET6, IPPROTO_IPV6, 1750 IPV6CTL_SENDREDIRECTS, CTL_EOL); 1751 sysctl_createv(clog, 0, NULL, NULL, 1752 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1753 CTLTYPE_INT, "hlim", 1754 SYSCTL_DESCR("Hop limit for an INET6 datagram"), 1755 NULL, 0, &ip6_defhlim, 0, 1756 CTL_NET, PF_INET6, IPPROTO_IPV6, 1757 IPV6CTL_DEFHLIM, CTL_EOL); 1758 #ifdef notyet 1759 sysctl_createv(clog, 0, NULL, NULL, 1760 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1761 CTLTYPE_INT, "mtu", NULL, 1762 NULL, 0, &, 0, 1763 CTL_NET, PF_INET6, IPPROTO_IPV6, 1764 IPV6CTL_DEFMTU, CTL_EOL); 1765 #endif 1766 #ifdef __no_idea__ 1767 sysctl_createv(clog, 0, NULL, NULL, 1768 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1769 CTLTYPE_INT, "forwsrcrt", NULL, 1770 NULL, 0, &?, 0, 1771 CTL_NET, PF_INET6, IPPROTO_IPV6, 1772 IPV6CTL_FORWSRCRT, CTL_EOL); 1773 sysctl_createv(clog, 0, NULL, NULL, 1774 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1775 CTLTYPE_STRUCT, "mrtstats", NULL, 1776 NULL, 0, &?, sizeof(?), 1777 CTL_NET, PF_INET6, IPPROTO_IPV6, 1778 IPV6CTL_MRTSTATS, CTL_EOL); 1779 sysctl_createv(clog, 0, NULL, NULL, 1780 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1781 CTLTYPE_?, "mrtproto", NULL, 1782 NULL, 0, &?, sizeof(?), 1783 CTL_NET, PF_INET6, IPPROTO_IPV6, 1784 IPV6CTL_MRTPROTO, CTL_EOL); 1785 #endif 1786 sysctl_createv(clog, 0, NULL, NULL, 1787 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1788 CTLTYPE_INT, "maxfragpackets", 1789 SYSCTL_DESCR("Maximum number of fragments to buffer " 1790 "for reassembly"), 1791 NULL, 0, &ip6_maxfragpackets, 0, 1792 CTL_NET, PF_INET6, IPPROTO_IPV6, 1793 IPV6CTL_MAXFRAGPACKETS, CTL_EOL); 1794 #ifdef __no_idea__ 1795 sysctl_createv(clog, 0, NULL, NULL, 1796 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1797 CTLTYPE_INT, "sourcecheck", NULL, 1798 NULL, 0, &?, 0, 1799 CTL_NET, PF_INET6, IPPROTO_IPV6, 1800 IPV6CTL_SOURCECHECK, CTL_EOL); 1801 sysctl_createv(clog, 0, NULL, NULL, 1802 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1803 CTLTYPE_INT, "sourcecheck_logint", NULL, 1804 NULL, 0, &?, 0, 1805 CTL_NET, PF_INET6, IPPROTO_IPV6, 1806 IPV6CTL_SOURCECHECK_LOGINT, CTL_EOL); 1807 #endif 1808 sysctl_createv(clog, 0, NULL, NULL, 1809 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1810 CTLTYPE_INT, "accept_rtadv", 1811 SYSCTL_DESCR("Accept router advertisements"), 1812 NULL, 0, &ip6_accept_rtadv, 0, 1813 CTL_NET, PF_INET6, IPPROTO_IPV6, 1814 IPV6CTL_ACCEPT_RTADV, CTL_EOL); 1815 sysctl_createv(clog, 0, NULL, NULL, 1816 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1817 CTLTYPE_INT, "keepfaith", 1818 SYSCTL_DESCR("Activate faith interface"), 1819 NULL, 0, &ip6_keepfaith, 0, 1820 CTL_NET, PF_INET6, IPPROTO_IPV6, 1821 IPV6CTL_KEEPFAITH, CTL_EOL); 1822 sysctl_createv(clog, 0, NULL, NULL, 1823 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1824 CTLTYPE_INT, "log_interval", 1825 SYSCTL_DESCR("Minumum interval between logging " 1826 "unroutable packets"), 1827 NULL, 0, &ip6_log_interval, 0, 1828 CTL_NET, PF_INET6, IPPROTO_IPV6, 1829 IPV6CTL_LOG_INTERVAL, CTL_EOL); 1830 sysctl_createv(clog, 0, NULL, NULL, 1831 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1832 CTLTYPE_INT, "hdrnestlimit", 1833 SYSCTL_DESCR("Maximum number of nested IPv6 headers"), 1834 NULL, 0, &ip6_hdrnestlimit, 0, 1835 CTL_NET, PF_INET6, IPPROTO_IPV6, 1836 IPV6CTL_HDRNESTLIMIT, CTL_EOL); 1837 sysctl_createv(clog, 0, NULL, NULL, 1838 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1839 CTLTYPE_INT, "dad_count", 1840 SYSCTL_DESCR("Number of Duplicate Address Detection " 1841 "probes to send"), 1842 NULL, 0, &ip6_dad_count, 0, 1843 CTL_NET, PF_INET6, IPPROTO_IPV6, 1844 IPV6CTL_DAD_COUNT, CTL_EOL); 1845 sysctl_createv(clog, 0, NULL, NULL, 1846 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1847 CTLTYPE_INT, "auto_flowlabel", 1848 SYSCTL_DESCR("Assign random IPv6 flow labels"), 1849 NULL, 0, &ip6_auto_flowlabel, 0, 1850 CTL_NET, PF_INET6, IPPROTO_IPV6, 1851 IPV6CTL_AUTO_FLOWLABEL, CTL_EOL); 1852 sysctl_createv(clog, 0, NULL, NULL, 1853 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1854 CTLTYPE_INT, "defmcasthlim", 1855 SYSCTL_DESCR("Default multicast hop limit"), 1856 NULL, 0, &ip6_defmcasthlim, 0, 1857 CTL_NET, PF_INET6, IPPROTO_IPV6, 1858 IPV6CTL_DEFMCASTHLIM, CTL_EOL); 1859 #if NGIF > 0 1860 sysctl_createv(clog, 0, NULL, NULL, 1861 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1862 CTLTYPE_INT, "gifhlim", 1863 SYSCTL_DESCR("Default hop limit for a gif tunnel datagram"), 1864 NULL, 0, &ip6_gif_hlim, 0, 1865 CTL_NET, PF_INET6, IPPROTO_IPV6, 1866 IPV6CTL_GIF_HLIM, CTL_EOL); 1867 #endif /* NGIF */ 1868 sysctl_createv(clog, 0, NULL, NULL, 1869 CTLFLAG_PERMANENT, 1870 CTLTYPE_STRING, "kame_version", 1871 SYSCTL_DESCR("KAME Version"), 1872 NULL, 0, __UNCONST(__KAME_VERSION), 0, 1873 CTL_NET, PF_INET6, IPPROTO_IPV6, 1874 IPV6CTL_KAME_VERSION, CTL_EOL); 1875 sysctl_createv(clog, 0, NULL, NULL, 1876 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1877 CTLTYPE_INT, "use_deprecated", 1878 SYSCTL_DESCR("Allow use of deprecated addresses as " 1879 "source addresses"), 1880 NULL, 0, &ip6_use_deprecated, 0, 1881 CTL_NET, PF_INET6, IPPROTO_IPV6, 1882 IPV6CTL_USE_DEPRECATED, CTL_EOL); 1883 sysctl_createv(clog, 0, NULL, NULL, 1884 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1885 CTLTYPE_INT, "rr_prune", NULL, 1886 NULL, 0, &ip6_rr_prune, 0, 1887 CTL_NET, PF_INET6, IPPROTO_IPV6, 1888 IPV6CTL_RR_PRUNE, CTL_EOL); 1889 sysctl_createv(clog, 0, NULL, NULL, 1890 CTLFLAG_PERMANENT 1891 #ifndef INET6_BINDV6ONLY 1892 |CTLFLAG_READWRITE, 1893 #endif 1894 CTLTYPE_INT, "v6only", 1895 SYSCTL_DESCR("Disallow PF_INET6 sockets from connecting " 1896 "to PF_INET sockets"), 1897 NULL, 0, &ip6_v6only, 0, 1898 CTL_NET, PF_INET6, IPPROTO_IPV6, 1899 IPV6CTL_V6ONLY, CTL_EOL); 1900 sysctl_createv(clog, 0, NULL, NULL, 1901 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1902 CTLTYPE_INT, "anonportmin", 1903 SYSCTL_DESCR("Lowest ephemeral port number to assign"), 1904 sysctl_net_inet_ip_ports, 0, &ip6_anonportmin, 0, 1905 CTL_NET, PF_INET6, IPPROTO_IPV6, 1906 IPV6CTL_ANONPORTMIN, CTL_EOL); 1907 sysctl_createv(clog, 0, NULL, NULL, 1908 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1909 CTLTYPE_INT, "anonportmax", 1910 SYSCTL_DESCR("Highest ephemeral port number to assign"), 1911 sysctl_net_inet_ip_ports, 0, &ip6_anonportmax, 0, 1912 CTL_NET, PF_INET6, IPPROTO_IPV6, 1913 IPV6CTL_ANONPORTMAX, CTL_EOL); 1914 #ifndef IPNOPRIVPORTS 1915 sysctl_createv(clog, 0, NULL, NULL, 1916 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1917 CTLTYPE_INT, "lowportmin", 1918 SYSCTL_DESCR("Lowest privileged ephemeral port number " 1919 "to assign"), 1920 sysctl_net_inet_ip_ports, 0, &ip6_lowportmin, 0, 1921 CTL_NET, PF_INET6, IPPROTO_IPV6, 1922 IPV6CTL_LOWPORTMIN, CTL_EOL); 1923 sysctl_createv(clog, 0, NULL, NULL, 1924 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1925 CTLTYPE_INT, "lowportmax", 1926 SYSCTL_DESCR("Highest privileged ephemeral port number " 1927 "to assign"), 1928 sysctl_net_inet_ip_ports, 0, &ip6_lowportmax, 0, 1929 CTL_NET, PF_INET6, IPPROTO_IPV6, 1930 IPV6CTL_LOWPORTMAX, CTL_EOL); 1931 #endif /* IPNOPRIVPORTS */ 1932 sysctl_createv(clog, 0, NULL, NULL, 1933 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1934 CTLTYPE_INT, "use_tempaddr", 1935 SYSCTL_DESCR("Use temporary address"), 1936 NULL, 0, &ip6_use_tempaddr, 0, 1937 CTL_NET, PF_INET6, IPPROTO_IPV6, 1938 CTL_CREATE, CTL_EOL); 1939 sysctl_createv(clog, 0, NULL, NULL, 1940 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1941 CTLTYPE_INT, "temppltime", 1942 SYSCTL_DESCR("preferred lifetime of a temporary address"), 1943 NULL, 0, &ip6_temp_preferred_lifetime, 0, 1944 CTL_NET, PF_INET6, IPPROTO_IPV6, 1945 CTL_CREATE, CTL_EOL); 1946 sysctl_createv(clog, 0, NULL, NULL, 1947 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1948 CTLTYPE_INT, "tempvltime", 1949 SYSCTL_DESCR("valid lifetime of a temporary address"), 1950 NULL, 0, &ip6_temp_valid_lifetime, 0, 1951 CTL_NET, PF_INET6, IPPROTO_IPV6, 1952 CTL_CREATE, CTL_EOL); 1953 sysctl_createv(clog, 0, NULL, NULL, 1954 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1955 CTLTYPE_INT, "maxfrags", 1956 SYSCTL_DESCR("Maximum fragments in reassembly queue"), 1957 NULL, 0, &ip6_maxfrags, 0, 1958 CTL_NET, PF_INET6, IPPROTO_IPV6, 1959 IPV6CTL_MAXFRAGS, CTL_EOL); 1960 sysctl_createv(clog, 0, NULL, NULL, 1961 CTLFLAG_PERMANENT, 1962 CTLTYPE_STRUCT, "stats", 1963 SYSCTL_DESCR("IPv6 statistics"), 1964 NULL, 0, &ip6stat, sizeof(ip6stat), 1965 CTL_NET, PF_INET6, IPPROTO_IPV6, 1966 IPV6CTL_STATS, CTL_EOL); 1967 sysctl_createv(clog, 0, NULL, NULL, 1968 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1969 CTLTYPE_INT, "use_defaultzone", 1970 SYSCTL_DESCR("Whether to use the default scope zones"), 1971 NULL, 0, &ip6_use_defzone, 0, 1972 CTL_NET, PF_INET6, IPPROTO_IPV6, 1973 IPV6CTL_USE_DEFAULTZONE, CTL_EOL); 1974 sysctl_createv(clog, 0, NULL, NULL, 1975 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1976 CTLTYPE_INT, "mcast_pmtu", 1977 SYSCTL_DESCR("Enable pMTU discovery for multicast packet"), 1978 NULL, 0, &ip6_mcast_pmtu, 0, 1979 CTL_NET, PF_INET6, IPPROTO_IPV6, 1980 CTL_CREATE, CTL_EOL); 1981 #ifdef GATEWAY 1982 sysctl_createv(clog, 0, NULL, NULL, 1983 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1984 CTLTYPE_INT, "maxflows", 1985 SYSCTL_DESCR("Number of flows for fast forwarding (IPv6)"), 1986 sysctl_net_inet6_ip6_maxflows, 0, &ip6_maxflows, 0, 1987 CTL_NET, PF_INET6, IPPROTO_IPV6, 1988 CTL_CREATE, CTL_EOL); 1989 sysctl_createv(clog, 0, NULL, NULL, 1990 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1991 CTLTYPE_INT, "hashsize", 1992 SYSCTL_DESCR("Size of hash table for fast forwarding (IPv6)"), 1993 sysctl_net_inet6_ip6_hashsize, 0, &ip6_hashsize, 0, 1994 CTL_NET, PF_INET6, IPPROTO_IPV6, 1995 CTL_CREATE, CTL_EOL); 1996 #endif 1997 sysctl_createv(clog, 0, NULL, NULL, 1998 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1999 CTLTYPE_INT, "rht0", 2000 SYSCTL_DESCR("Processing of routing header type 0 (IPv6)"), 2001 sysctl_net_inet6_ip6_rht0, 0, &ip6_rht0, 0, 2002 CTL_NET, PF_INET6, IPPROTO_IPV6, 2003 CTL_CREATE, CTL_EOL); 2004 } 2005
Indexes created Mon Sep 22 13:09:51 GMT 2025