1 /* $NetBSD: ip6_input.c,v 1.113 2007/12/04 10:27:34 dyoung 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 1.113 2007/12/04 10:27:34 dyoung 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 callout_t 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(void *); 152 static struct m_tag *ip6_setdstifaddr(struct mbuf *, const struct in6_ifaddr *); 153 154 static int ip6_hopopts_input(u_int32_t *, u_int32_t *, struct mbuf **, int *); 155 static struct mbuf *ip6_pullexthdr(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, 0); 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, 0); 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 hit, 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 rtentry *rt; 253 union { 254 struct sockaddr dst; 255 struct sockaddr_in6 dst6; 256 } u; 257 #ifdef FAST_IPSEC 258 struct m_tag *mtag; 259 struct tdb_ident *tdbi; 260 struct secpolicy *sp; 261 int s, error; 262 #endif 263 264 #ifdef IPSEC 265 /* 266 * should the inner packet be considered authentic? 267 * see comment in ah4_input(). 268 */ 269 m->m_flags &= ~M_AUTHIPHDR; 270 m->m_flags &= ~M_AUTHIPDGM; 271 #endif 272 273 /* 274 * make sure we don't have onion peering information into m_tag. 275 */ 276 ip6_delaux(m); 277 278 /* 279 * mbuf statistics 280 */ 281 if (m->m_flags & M_EXT) { 282 if (m->m_next) 283 ip6stat.ip6s_mext2m++; 284 else 285 ip6stat.ip6s_mext1++; 286 } else { 287 #define M2MMAX __arraycount(ip6stat.ip6s_m2m) 288 if (m->m_next) { 289 if (m->m_flags & M_LOOP) { 290 ip6stat.ip6s_m2m[lo0ifp->if_index]++; /* XXX */ 291 } else if (m->m_pkthdr.rcvif->if_index < M2MMAX) 292 ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++; 293 else 294 ip6stat.ip6s_m2m[0]++; 295 } else 296 ip6stat.ip6s_m1++; 297 #undef M2MMAX 298 } 299 300 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive); 301 ip6stat.ip6s_total++; 302 303 /* 304 * If the IPv6 header is not aligned, slurp it up into a new 305 * mbuf with space for link headers, in the event we forward 306 * it. Otherwise, if it is aligned, make sure the entire base 307 * IPv6 header is in the first mbuf of the chain. 308 */ 309 if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 310 struct ifnet *inifp = m->m_pkthdr.rcvif; 311 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 312 (max_linkhdr + 3) & ~3)) == NULL) { 313 /* XXXJRT new stat, please */ 314 ip6stat.ip6s_toosmall++; 315 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 316 return; 317 } 318 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 319 struct ifnet *inifp = m->m_pkthdr.rcvif; 320 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 321 ip6stat.ip6s_toosmall++; 322 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 323 return; 324 } 325 } 326 327 ip6 = mtod(m, struct ip6_hdr *); 328 329 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 330 ip6stat.ip6s_badvers++; 331 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 332 goto bad; 333 } 334 335 #if defined(IPSEC) 336 /* IPv6 fast forwarding is not compatible with IPsec. */ 337 m->m_flags &= ~M_CANFASTFWD; 338 #else 339 /* 340 * Assume that we can create a fast-forward IP flow entry 341 * based on this packet. 342 */ 343 m->m_flags |= M_CANFASTFWD; 344 #endif 345 346 #ifdef PFIL_HOOKS 347 /* 348 * Run through list of hooks for input packets. If there are any 349 * filters which require that additional packets in the flow are 350 * not fast-forwarded, they must clear the M_CANFASTFWD flag. 351 * Note that filters must _never_ set this flag, as another filter 352 * in the list may have previously cleared it. 353 */ 354 /* 355 * let ipfilter look at packet on the wire, 356 * not the decapsulated packet. 357 */ 358 #ifdef IPSEC 359 if (!ipsec_getnhist(m)) 360 #elif defined(FAST_IPSEC) 361 if (!ipsec_indone(m)) 362 #else 363 if (1) 364 #endif 365 { 366 struct in6_addr odst; 367 368 odst = ip6->ip6_dst; 369 if (pfil_run_hooks(&inet6_pfil_hook, &m, m->m_pkthdr.rcvif, 370 PFIL_IN) != 0) 371 return; 372 if (m == NULL) 373 return; 374 ip6 = mtod(m, struct ip6_hdr *); 375 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst); 376 } 377 #endif /* PFIL_HOOKS */ 378 379 ip6stat.ip6s_nxthist[ip6->ip6_nxt]++; 380 381 #ifdef ALTQ 382 if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) { 383 /* packet is dropped by traffic conditioner */ 384 return; 385 } 386 #endif 387 388 /* 389 * Check against address spoofing/corruption. 390 */ 391 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) || 392 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) { 393 /* 394 * XXX: "badscope" is not very suitable for a multicast source. 395 */ 396 ip6stat.ip6s_badscope++; 397 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 398 goto bad; 399 } 400 /* 401 * The following check is not documented in specs. A malicious 402 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack 403 * and bypass security checks (act as if it was from 127.0.0.1 by using 404 * IPv6 src ::ffff:127.0.0.1). Be cautious. 405 * 406 * This check chokes if we are in an SIIT cloud. As none of BSDs 407 * support IPv4-less kernel compilation, we cannot support SIIT 408 * environment at all. So, it makes more sense for us to reject any 409 * malicious packets for non-SIIT environment, than try to do a 410 * partial support for SIIT environment. 411 */ 412 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 413 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 414 ip6stat.ip6s_badscope++; 415 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 416 goto bad; 417 } 418 #if 0 419 /* 420 * Reject packets with IPv4 compatible addresses (auto tunnel). 421 * 422 * The code forbids auto tunnel relay case in RFC1933 (the check is 423 * stronger than RFC1933). We may want to re-enable it if mech-xx 424 * is revised to forbid relaying case. 425 */ 426 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) || 427 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) { 428 ip6stat.ip6s_badscope++; 429 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 430 goto bad; 431 } 432 #endif 433 434 /* 435 * Disambiguate address scope zones (if there is ambiguity). 436 * We first make sure that the original source or destination address 437 * is not in our internal form for scoped addresses. Such addresses 438 * are not necessarily invalid spec-wise, but we cannot accept them due 439 * to the usage conflict. 440 * in6_setscope() then also checks and rejects the cases where src or 441 * dst are the loopback address and the receiving interface 442 * is not loopback. 443 */ 444 if (__predict_false( 445 m_makewritable(&m, 0, sizeof(struct ip6_hdr), M_DONTWAIT))) 446 goto bad; 447 ip6 = mtod(m, struct ip6_hdr *); 448 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) { 449 ip6stat.ip6s_badscope++; /* XXX */ 450 goto bad; 451 } 452 if (in6_setscope(&ip6->ip6_src, m->m_pkthdr.rcvif, NULL) || 453 in6_setscope(&ip6->ip6_dst, m->m_pkthdr.rcvif, NULL)) { 454 ip6stat.ip6s_badscope++; 455 goto bad; 456 } 457 458 /* 459 * Multicast check 460 */ 461 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 462 struct in6_multi *in6m = 0; 463 464 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast); 465 /* 466 * See if we belong to the destination multicast group on the 467 * arrival interface. 468 */ 469 IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m); 470 if (in6m) 471 ours = 1; 472 else if (!ip6_mrouter) { 473 ip6stat.ip6s_notmember++; 474 ip6stat.ip6s_cantforward++; 475 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 476 goto bad; 477 } 478 deliverifp = m->m_pkthdr.rcvif; 479 goto hbhcheck; 480 } 481 482 sockaddr_in6_init(&u.dst6, &ip6->ip6_dst, 0, 0, 0); 483 484 /* 485 * Unicast check 486 */ 487 rt = rtcache_lookup2(&ip6_forward_rt, &u.dst, 1, &hit); 488 if (hit) 489 ip6stat.ip6s_forward_cachehit++; 490 else 491 ip6stat.ip6s_forward_cachemiss++; 492 493 #define rt6_getkey(__rt) satocsin6(rt_getkey(__rt)) 494 495 /* 496 * Accept the packet if the forwarding interface to the destination 497 * according to the routing table is the loopback interface, 498 * unless the associated route has a gateway. 499 * Note that this approach causes to accept a packet if there is a 500 * route to the loopback interface for the destination of the packet. 501 * But we think it's even useful in some situations, e.g. when using 502 * a special daemon which wants to intercept the packet. 503 */ 504 if (rt != NULL && 505 (rt->rt_flags & (RTF_HOST|RTF_GATEWAY)) == RTF_HOST && 506 !(rt->rt_flags & RTF_CLONED) && 507 #if 0 508 /* 509 * The check below is redundant since the comparison of 510 * the destination and the key of the rtentry has 511 * already done through looking up the routing table. 512 */ 513 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &rt6_getkey(rt)->sin6_addr) && 514 #endif 515 rt->rt_ifp->if_type == IFT_LOOP) { 516 struct in6_ifaddr *ia6 = (struct in6_ifaddr *)rt->rt_ifa; 517 if (ia6->ia6_flags & IN6_IFF_ANYCAST) 518 m->m_flags |= M_ANYCAST6; 519 /* 520 * packets to a tentative, duplicated, or somehow invalid 521 * address must not be accepted. 522 */ 523 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) { 524 /* this address is ready */ 525 ours = 1; 526 deliverifp = ia6->ia_ifp; /* correct? */ 527 goto hbhcheck; 528 } else { 529 /* address is not ready, so discard the packet. */ 530 nd6log((LOG_INFO, 531 "ip6_input: packet to an unready address %s->%s\n", 532 ip6_sprintf(&ip6->ip6_src), 533 ip6_sprintf(&ip6->ip6_dst))); 534 535 goto bad; 536 } 537 } 538 539 /* 540 * FAITH (Firewall Aided Internet Translator) 541 */ 542 #if defined(NFAITH) && 0 < NFAITH 543 if (ip6_keepfaith) { 544 if (rt != NULL && rt->rt_ifp != NULL && 545 rt->rt_ifp->if_type == IFT_FAITH) { 546 /* XXX do we need more sanity checks? */ 547 ours = 1; 548 deliverifp = rt->rt_ifp; /* faith */ 549 goto hbhcheck; 550 } 551 } 552 #endif 553 554 #if 0 555 { 556 /* 557 * Last resort: check in6_ifaddr for incoming interface. 558 * The code is here until I update the "goto ours hack" code above 559 * working right. 560 */ 561 struct ifaddr *ifa; 562 IFADDR_FOREACH(ifa, m->m_pkthdr.rcvif) { 563 if (ifa->ifa_addr == NULL) 564 continue; /* just for safety */ 565 if (ifa->ifa_addr->sa_family != AF_INET6) 566 continue; 567 if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) { 568 ours = 1; 569 deliverifp = ifa->ifa_ifp; 570 goto hbhcheck; 571 } 572 } 573 } 574 #endif 575 576 /* 577 * Now there is no reason to process the packet if it's not our own 578 * and we're not a router. 579 */ 580 if (!ip6_forwarding) { 581 ip6stat.ip6s_cantforward++; 582 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 583 goto bad; 584 } 585 586 hbhcheck: 587 /* 588 * record address information into m_tag, if we don't have one yet. 589 * note that we are unable to record it, if the address is not listed 590 * as our interface address (e.g. multicast addresses, addresses 591 * within FAITH prefixes and such). 592 */ 593 if (deliverifp && ip6_getdstifaddr(m) == NULL) { 594 struct in6_ifaddr *ia6; 595 596 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 597 if (ia6 != NULL && ip6_setdstifaddr(m, ia6) == NULL) { 598 /* 599 * XXX maybe we should drop the packet here, 600 * as we could not provide enough information 601 * to the upper layers. 602 */ 603 } 604 } 605 606 /* 607 * Process Hop-by-Hop options header if it's contained. 608 * m may be modified in ip6_hopopts_input(). 609 * If a JumboPayload option is included, plen will also be modified. 610 */ 611 plen = (u_int32_t)ntohs(ip6->ip6_plen); 612 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 613 struct ip6_hbh *hbh; 614 615 if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) { 616 #if 0 /*touches NULL pointer*/ 617 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 618 #endif 619 return; /* m have already been freed */ 620 } 621 622 /* adjust pointer */ 623 ip6 = mtod(m, struct ip6_hdr *); 624 625 /* 626 * if the payload length field is 0 and the next header field 627 * indicates Hop-by-Hop Options header, then a Jumbo Payload 628 * option MUST be included. 629 */ 630 if (ip6->ip6_plen == 0 && plen == 0) { 631 /* 632 * Note that if a valid jumbo payload option is 633 * contained, ip6_hopopts_input() must set a valid 634 * (non-zero) payload length to the variable plen. 635 */ 636 ip6stat.ip6s_badoptions++; 637 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 638 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 639 icmp6_error(m, ICMP6_PARAM_PROB, 640 ICMP6_PARAMPROB_HEADER, 641 (char *)&ip6->ip6_plen - (char *)ip6); 642 return; 643 } 644 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 645 sizeof(struct ip6_hbh)); 646 if (hbh == NULL) { 647 ip6stat.ip6s_tooshort++; 648 return; 649 } 650 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 651 nxt = hbh->ip6h_nxt; 652 653 /* 654 * accept the packet if a router alert option is included 655 * and we act as an IPv6 router. 656 */ 657 if (rtalert != ~0 && ip6_forwarding) 658 ours = 1; 659 } else 660 nxt = ip6->ip6_nxt; 661 662 /* 663 * Check that the amount of data in the buffers 664 * is as at least much as the IPv6 header would have us expect. 665 * Trim mbufs if longer than we expect. 666 * Drop packet if shorter than we expect. 667 */ 668 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 669 ip6stat.ip6s_tooshort++; 670 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 671 goto bad; 672 } 673 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 674 if (m->m_len == m->m_pkthdr.len) { 675 m->m_len = sizeof(struct ip6_hdr) + plen; 676 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 677 } else 678 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 679 } 680 681 /* 682 * Forward if desirable. 683 */ 684 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 685 /* 686 * If we are acting as a multicast router, all 687 * incoming multicast packets are passed to the 688 * kernel-level multicast forwarding function. 689 * The packet is returned (relatively) intact; if 690 * ip6_mforward() returns a non-zero value, the packet 691 * must be discarded, else it may be accepted below. 692 */ 693 if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) { 694 ip6stat.ip6s_cantforward++; 695 m_freem(m); 696 return; 697 } 698 if (!ours) { 699 m_freem(m); 700 return; 701 } 702 } else if (!ours) { 703 ip6_forward(m, srcrt); 704 return; 705 } 706 707 ip6 = mtod(m, struct ip6_hdr *); 708 709 /* 710 * Malicious party may be able to use IPv4 mapped addr to confuse 711 * tcp/udp stack and bypass security checks (act as if it was from 712 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious. 713 * 714 * For SIIT end node behavior, you may want to disable the check. 715 * However, you will become vulnerable to attacks using IPv4 mapped 716 * source. 717 */ 718 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 719 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 720 ip6stat.ip6s_badscope++; 721 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 722 goto bad; 723 } 724 725 /* 726 * Tell launch routine the next header 727 */ 728 #ifdef IFA_STATS 729 if (deliverifp != NULL) { 730 struct in6_ifaddr *ia6; 731 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 732 if (ia6) 733 ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len; 734 } 735 #endif 736 ip6stat.ip6s_delivered++; 737 in6_ifstat_inc(deliverifp, ifs6_in_deliver); 738 nest = 0; 739 740 rh_present = 0; 741 while (nxt != IPPROTO_DONE) { 742 if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) { 743 ip6stat.ip6s_toomanyhdr++; 744 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 745 goto bad; 746 } 747 748 /* 749 * protection against faulty packet - there should be 750 * more sanity checks in header chain processing. 751 */ 752 if (m->m_pkthdr.len < off) { 753 ip6stat.ip6s_tooshort++; 754 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 755 goto bad; 756 } 757 758 if (nxt == IPPROTO_ROUTING) { 759 if (rh_present++) { 760 in6_ifstat_inc(m->m_pkthdr.rcvif, 761 ifs6_in_hdrerr); 762 ip6stat.ip6s_badoptions++; 763 goto bad; 764 } 765 } 766 767 #ifdef IPSEC 768 /* 769 * enforce IPsec policy checking if we are seeing last header. 770 * note that we do not visit this with protocols with pcb layer 771 * code - like udp/tcp/raw ip. 772 */ 773 if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 && 774 ipsec6_in_reject(m, NULL)) { 775 ipsec6stat.in_polvio++; 776 goto bad; 777 } 778 #endif 779 #ifdef FAST_IPSEC 780 /* 781 * enforce IPsec policy checking if we are seeing last header. 782 * note that we do not visit this with protocols with pcb layer 783 * code - like udp/tcp/raw ip. 784 */ 785 if ((inet6sw[ip_protox[nxt]].pr_flags & PR_LASTHDR) != 0) { 786 /* 787 * Check if the packet has already had IPsec processing 788 * done. If so, then just pass it along. This tag gets 789 * set during AH, ESP, etc. input handling, before the 790 * packet is returned to the ip input queue for delivery. 791 */ 792 mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL); 793 s = splsoftnet(); 794 if (mtag != NULL) { 795 tdbi = (struct tdb_ident *)(mtag + 1); 796 sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND); 797 } else { 798 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, 799 IP_FORWARDING, &error); 800 } 801 if (sp != NULL) { 802 /* 803 * Check security policy against packet attributes. 804 */ 805 error = ipsec_in_reject(sp, m); 806 KEY_FREESP(&sp); 807 } else { 808 /* XXX error stat??? */ 809 error = EINVAL; 810 DPRINTF(("ip6_input: no SP, packet discarded\n"));/*XXX*/ 811 } 812 splx(s); 813 if (error) 814 goto bad; 815 } 816 #endif /* FAST_IPSEC */ 817 818 819 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt); 820 } 821 return; 822 bad: 823 m_freem(m); 824 } 825 826 /* 827 * set/grab in6_ifaddr correspond to IPv6 destination address. 828 */ 829 static struct m_tag * 830 ip6_setdstifaddr(struct mbuf *m, const struct in6_ifaddr *ia) 831 { 832 struct m_tag *mtag; 833 834 mtag = ip6_addaux(m); 835 if (mtag != NULL) { 836 struct ip6aux *ip6a; 837 838 ip6a = (struct ip6aux *)(mtag + 1); 839 in6_setscope(&ip6a->ip6a_src, ia->ia_ifp, &ip6a->ip6a_scope_id); 840 ip6a->ip6a_src = ia->ia_addr.sin6_addr; 841 ip6a->ip6a_flags = ia->ia6_flags; 842 } 843 return mtag; /* NULL if failed to set */ 844 } 845 846 const struct ip6aux * 847 ip6_getdstifaddr(struct mbuf *m) 848 { 849 struct m_tag *mtag; 850 851 mtag = ip6_findaux(m); 852 if (mtag != NULL) 853 return (struct ip6aux *)(mtag + 1); 854 else 855 return NULL; 856 } 857 858 /* 859 * Hop-by-Hop options header processing. If a valid jumbo payload option is 860 * included, the real payload length will be stored in plenp. 861 * 862 * rtalertp - XXX: should be stored more smart way 863 */ 864 static int 865 ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp, 866 struct mbuf **mp, int *offp) 867 { 868 struct mbuf *m = *mp; 869 int off = *offp, hbhlen; 870 struct ip6_hbh *hbh; 871 872 /* validation of the length of the header */ 873 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, 874 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh)); 875 if (hbh == NULL) { 876 ip6stat.ip6s_tooshort++; 877 return -1; 878 } 879 hbhlen = (hbh->ip6h_len + 1) << 3; 880 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 881 hbhlen); 882 if (hbh == NULL) { 883 ip6stat.ip6s_tooshort++; 884 return -1; 885 } 886 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 887 off += hbhlen; 888 hbhlen -= sizeof(struct ip6_hbh); 889 890 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 891 hbhlen, rtalertp, plenp) < 0) 892 return (-1); 893 894 *offp = off; 895 *mp = m; 896 return (0); 897 } 898 899 /* 900 * Search header for all Hop-by-hop options and process each option. 901 * This function is separate from ip6_hopopts_input() in order to 902 * handle a case where the sending node itself process its hop-by-hop 903 * options header. In such a case, the function is called from ip6_output(). 904 * 905 * The function assumes that hbh header is located right after the IPv6 header 906 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to 907 * opthead + hbhlen is located in continuous memory region. 908 */ 909 int 910 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen, 911 u_int32_t *rtalertp, u_int32_t *plenp) 912 { 913 struct ip6_hdr *ip6; 914 int optlen = 0; 915 u_int8_t *opt = opthead; 916 u_int16_t rtalert_val; 917 u_int32_t jumboplen; 918 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh); 919 920 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 921 switch (*opt) { 922 case IP6OPT_PAD1: 923 optlen = 1; 924 break; 925 case IP6OPT_PADN: 926 if (hbhlen < IP6OPT_MINLEN) { 927 ip6stat.ip6s_toosmall++; 928 goto bad; 929 } 930 optlen = *(opt + 1) + 2; 931 break; 932 case IP6OPT_RTALERT: 933 /* XXX may need check for alignment */ 934 if (hbhlen < IP6OPT_RTALERT_LEN) { 935 ip6stat.ip6s_toosmall++; 936 goto bad; 937 } 938 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) { 939 /* XXX stat */ 940 icmp6_error(m, ICMP6_PARAM_PROB, 941 ICMP6_PARAMPROB_HEADER, 942 erroff + opt + 1 - opthead); 943 return (-1); 944 } 945 optlen = IP6OPT_RTALERT_LEN; 946 bcopy((void *)(opt + 2), (void *)&rtalert_val, 2); 947 *rtalertp = ntohs(rtalert_val); 948 break; 949 case IP6OPT_JUMBO: 950 /* XXX may need check for alignment */ 951 if (hbhlen < IP6OPT_JUMBO_LEN) { 952 ip6stat.ip6s_toosmall++; 953 goto bad; 954 } 955 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) { 956 /* XXX stat */ 957 icmp6_error(m, ICMP6_PARAM_PROB, 958 ICMP6_PARAMPROB_HEADER, 959 erroff + opt + 1 - opthead); 960 return (-1); 961 } 962 optlen = IP6OPT_JUMBO_LEN; 963 964 /* 965 * IPv6 packets that have non 0 payload length 966 * must not contain a jumbo payload option. 967 */ 968 ip6 = mtod(m, struct ip6_hdr *); 969 if (ip6->ip6_plen) { 970 ip6stat.ip6s_badoptions++; 971 icmp6_error(m, ICMP6_PARAM_PROB, 972 ICMP6_PARAMPROB_HEADER, 973 erroff + opt - opthead); 974 return (-1); 975 } 976 977 /* 978 * We may see jumbolen in unaligned location, so 979 * we'd need to perform bcopy(). 980 */ 981 bcopy(opt + 2, &jumboplen, sizeof(jumboplen)); 982 jumboplen = (u_int32_t)htonl(jumboplen); 983 984 #if 1 985 /* 986 * if there are multiple jumbo payload options, 987 * *plenp will be non-zero and the packet will be 988 * rejected. 989 * the behavior may need some debate in ipngwg - 990 * multiple options does not make sense, however, 991 * there's no explicit mention in specification. 992 */ 993 if (*plenp != 0) { 994 ip6stat.ip6s_badoptions++; 995 icmp6_error(m, ICMP6_PARAM_PROB, 996 ICMP6_PARAMPROB_HEADER, 997 erroff + opt + 2 - opthead); 998 return (-1); 999 } 1000 #endif 1001 1002 /* 1003 * jumbo payload length must be larger than 65535. 1004 */ 1005 if (jumboplen <= IPV6_MAXPACKET) { 1006 ip6stat.ip6s_badoptions++; 1007 icmp6_error(m, ICMP6_PARAM_PROB, 1008 ICMP6_PARAMPROB_HEADER, 1009 erroff + opt + 2 - opthead); 1010 return (-1); 1011 } 1012 *plenp = jumboplen; 1013 1014 break; 1015 default: /* unknown option */ 1016 if (hbhlen < IP6OPT_MINLEN) { 1017 ip6stat.ip6s_toosmall++; 1018 goto bad; 1019 } 1020 optlen = ip6_unknown_opt(opt, m, 1021 erroff + opt - opthead); 1022 if (optlen == -1) 1023 return (-1); 1024 optlen += 2; 1025 break; 1026 } 1027 } 1028 1029 return (0); 1030 1031 bad: 1032 m_freem(m); 1033 return (-1); 1034 } 1035 1036 /* 1037 * Unknown option processing. 1038 * The third argument `off' is the offset from the IPv6 header to the option, 1039 * which is necessary if the IPv6 header the and option header and IPv6 header 1040 * is not continuous in order to return an ICMPv6 error. 1041 */ 1042 int 1043 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off) 1044 { 1045 struct ip6_hdr *ip6; 1046 1047 switch (IP6OPT_TYPE(*optp)) { 1048 case IP6OPT_TYPE_SKIP: /* ignore the option */ 1049 return ((int)*(optp + 1)); 1050 case IP6OPT_TYPE_DISCARD: /* silently discard */ 1051 m_freem(m); 1052 return (-1); 1053 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 1054 ip6stat.ip6s_badoptions++; 1055 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 1056 return (-1); 1057 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 1058 ip6stat.ip6s_badoptions++; 1059 ip6 = mtod(m, struct ip6_hdr *); 1060 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 1061 (m->m_flags & (M_BCAST|M_MCAST))) 1062 m_freem(m); 1063 else 1064 icmp6_error(m, ICMP6_PARAM_PROB, 1065 ICMP6_PARAMPROB_OPTION, off); 1066 return (-1); 1067 } 1068 1069 m_freem(m); /* XXX: NOTREACHED */ 1070 return (-1); 1071 } 1072 1073 /* 1074 * Create the "control" list for this pcb. 1075 * 1076 * The routine will be called from upper layer handlers like tcp6_input(). 1077 * Thus the routine assumes that the caller (tcp6_input) have already 1078 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the 1079 * very first mbuf on the mbuf chain. 1080 * We may want to add some infinite loop prevention or sanity checks for safety. 1081 * (This applies only when you are using KAME mbuf chain restriction, i.e. 1082 * you are using IP6_EXTHDR_CHECK() not m_pulldown()) 1083 */ 1084 void 1085 ip6_savecontrol(struct in6pcb *in6p, struct mbuf **mp, 1086 struct ip6_hdr *ip6, struct mbuf *m) 1087 { 1088 #ifdef RFC2292 1089 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y)) 1090 #else 1091 #define IS2292(x, y) (y) 1092 #endif 1093 1094 #ifdef SO_TIMESTAMP 1095 if (in6p->in6p_socket->so_options & SO_TIMESTAMP) { 1096 struct timeval tv; 1097 1098 microtime(&tv); 1099 *mp = sbcreatecontrol((void *) &tv, sizeof(tv), 1100 SCM_TIMESTAMP, SOL_SOCKET); 1101 if (*mp) 1102 mp = &(*mp)->m_next; 1103 } 1104 #endif 1105 1106 /* some OSes call this logic with IPv4 packet, for SO_TIMESTAMP */ 1107 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) 1108 return; 1109 1110 /* RFC 2292 sec. 5 */ 1111 if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) { 1112 struct in6_pktinfo pi6; 1113 1114 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr)); 1115 in6_clearscope(&pi6.ipi6_addr); /* XXX */ 1116 pi6.ipi6_ifindex = m->m_pkthdr.rcvif ? 1117 m->m_pkthdr.rcvif->if_index : 0; 1118 *mp = sbcreatecontrol((void *) &pi6, 1119 sizeof(struct in6_pktinfo), 1120 IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6); 1121 if (*mp) 1122 mp = &(*mp)->m_next; 1123 } 1124 1125 if (in6p->in6p_flags & IN6P_HOPLIMIT) { 1126 int hlim = ip6->ip6_hlim & 0xff; 1127 1128 *mp = sbcreatecontrol((void *) &hlim, sizeof(int), 1129 IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6); 1130 if (*mp) 1131 mp = &(*mp)->m_next; 1132 } 1133 1134 if ((in6p->in6p_flags & IN6P_TCLASS) != 0) { 1135 u_int32_t flowinfo; 1136 int tclass; 1137 1138 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK); 1139 flowinfo >>= 20; 1140 1141 tclass = flowinfo & 0xff; 1142 *mp = sbcreatecontrol((void *)&tclass, sizeof(tclass), 1143 IPV6_TCLASS, IPPROTO_IPV6); 1144 1145 if (*mp) 1146 mp = &(*mp)->m_next; 1147 } 1148 1149 /* 1150 * IPV6_HOPOPTS socket option. Recall that we required super-user 1151 * privilege for the option (see ip6_ctloutput), but it might be too 1152 * strict, since there might be some hop-by-hop options which can be 1153 * returned to normal user. 1154 * See also RFC3542 section 8 (or RFC2292 section 6). 1155 */ 1156 if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0) { 1157 /* 1158 * Check if a hop-by-hop options header is contatined in the 1159 * received packet, and if so, store the options as ancillary 1160 * data. Note that a hop-by-hop options header must be 1161 * just after the IPv6 header, which fact is assured through 1162 * the IPv6 input processing. 1163 */ 1164 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1165 if (xip6->ip6_nxt == IPPROTO_HOPOPTS) { 1166 struct ip6_hbh *hbh; 1167 int hbhlen; 1168 struct mbuf *ext; 1169 1170 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr), 1171 xip6->ip6_nxt); 1172 if (ext == NULL) { 1173 ip6stat.ip6s_tooshort++; 1174 return; 1175 } 1176 hbh = mtod(ext, struct ip6_hbh *); 1177 hbhlen = (hbh->ip6h_len + 1) << 3; 1178 if (hbhlen != ext->m_len) { 1179 m_freem(ext); 1180 ip6stat.ip6s_tooshort++; 1181 return; 1182 } 1183 1184 /* 1185 * XXX: We copy whole the header even if a jumbo 1186 * payload option is included, which option is to 1187 * be removed before returning in the RFC 2292. 1188 * Note: this constraint is removed in RFC3542. 1189 */ 1190 *mp = sbcreatecontrol((void *)hbh, hbhlen, 1191 IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS), 1192 IPPROTO_IPV6); 1193 if (*mp) 1194 mp = &(*mp)->m_next; 1195 m_freem(ext); 1196 } 1197 } 1198 1199 /* IPV6_DSTOPTS and IPV6_RTHDR socket options */ 1200 if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) { 1201 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1202 int nxt = xip6->ip6_nxt, off = sizeof(struct ip6_hdr); 1203 1204 /* 1205 * Search for destination options headers or routing 1206 * header(s) through the header chain, and stores each 1207 * header as ancillary data. 1208 * Note that the order of the headers remains in 1209 * the chain of ancillary data. 1210 */ 1211 for (;;) { /* is explicit loop prevention necessary? */ 1212 struct ip6_ext *ip6e = NULL; 1213 int elen; 1214 struct mbuf *ext = NULL; 1215 1216 /* 1217 * if it is not an extension header, don't try to 1218 * pull it from the chain. 1219 */ 1220 switch (nxt) { 1221 case IPPROTO_DSTOPTS: 1222 case IPPROTO_ROUTING: 1223 case IPPROTO_HOPOPTS: 1224 case IPPROTO_AH: /* is it possible? */ 1225 break; 1226 default: 1227 goto loopend; 1228 } 1229 1230 ext = ip6_pullexthdr(m, off, nxt); 1231 if (ext == NULL) { 1232 ip6stat.ip6s_tooshort++; 1233 return; 1234 } 1235 ip6e = mtod(ext, struct ip6_ext *); 1236 if (nxt == IPPROTO_AH) 1237 elen = (ip6e->ip6e_len + 2) << 2; 1238 else 1239 elen = (ip6e->ip6e_len + 1) << 3; 1240 if (elen != ext->m_len) { 1241 m_freem(ext); 1242 ip6stat.ip6s_tooshort++; 1243 return; 1244 } 1245 KASSERT(IP6_HDR_ALIGNED_P(ip6e)); 1246 1247 switch (nxt) { 1248 case IPPROTO_DSTOPTS: 1249 if (!in6p->in6p_flags & IN6P_DSTOPTS) 1250 break; 1251 1252 *mp = sbcreatecontrol((void *)ip6e, elen, 1253 IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS), 1254 IPPROTO_IPV6); 1255 if (*mp) 1256 mp = &(*mp)->m_next; 1257 break; 1258 1259 case IPPROTO_ROUTING: 1260 if (!in6p->in6p_flags & IN6P_RTHDR) 1261 break; 1262 1263 *mp = sbcreatecontrol((void *)ip6e, elen, 1264 IS2292(IPV6_2292RTHDR, IPV6_RTHDR), 1265 IPPROTO_IPV6); 1266 if (*mp) 1267 mp = &(*mp)->m_next; 1268 break; 1269 1270 case IPPROTO_HOPOPTS: 1271 case IPPROTO_AH: /* is it possible? */ 1272 break; 1273 1274 default: 1275 /* 1276 * other cases have been filtered in the above. 1277 * none will visit this case. here we supply 1278 * the code just in case (nxt overwritten or 1279 * other cases). 1280 */ 1281 m_freem(ext); 1282 goto loopend; 1283 1284 } 1285 1286 /* proceed with the next header. */ 1287 off += elen; 1288 nxt = ip6e->ip6e_nxt; 1289 ip6e = NULL; 1290 m_freem(ext); 1291 ext = NULL; 1292 } 1293 loopend: 1294 ; 1295 } 1296 } 1297 #undef IS2292 1298 1299 1300 void 1301 ip6_notify_pmtu(struct in6pcb *in6p, const struct sockaddr_in6 *dst, 1302 uint32_t *mtu) 1303 { 1304 struct socket *so; 1305 struct mbuf *m_mtu; 1306 struct ip6_mtuinfo mtuctl; 1307 1308 so = in6p->in6p_socket; 1309 1310 if (mtu == NULL) 1311 return; 1312 1313 #ifdef DIAGNOSTIC 1314 if (so == NULL) /* I believe this is impossible */ 1315 panic("ip6_notify_pmtu: socket is NULL"); 1316 #endif 1317 1318 memset(&mtuctl, 0, sizeof(mtuctl)); /* zero-clear for safety */ 1319 mtuctl.ip6m_mtu = *mtu; 1320 mtuctl.ip6m_addr = *dst; 1321 if (sa6_recoverscope(&mtuctl.ip6m_addr)) 1322 return; 1323 1324 if ((m_mtu = sbcreatecontrol((void *)&mtuctl, sizeof(mtuctl), 1325 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL) 1326 return; 1327 1328 if (sbappendaddr(&so->so_rcv, (const struct sockaddr *)dst, NULL, m_mtu) 1329 == 0) { 1330 m_freem(m_mtu); 1331 /* XXX: should count statistics */ 1332 } else 1333 sorwakeup(so); 1334 1335 return; 1336 } 1337 1338 /* 1339 * pull single extension header from mbuf chain. returns single mbuf that 1340 * contains the result, or NULL on error. 1341 */ 1342 static struct mbuf * 1343 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt) 1344 { 1345 struct ip6_ext ip6e; 1346 size_t elen; 1347 struct mbuf *n; 1348 1349 #ifdef DIAGNOSTIC 1350 switch (nxt) { 1351 case IPPROTO_DSTOPTS: 1352 case IPPROTO_ROUTING: 1353 case IPPROTO_HOPOPTS: 1354 case IPPROTO_AH: /* is it possible? */ 1355 break; 1356 default: 1357 printf("ip6_pullexthdr: invalid nxt=%d\n", nxt); 1358 } 1359 #endif 1360 1361 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1362 if (nxt == IPPROTO_AH) 1363 elen = (ip6e.ip6e_len + 2) << 2; 1364 else 1365 elen = (ip6e.ip6e_len + 1) << 3; 1366 1367 MGET(n, M_DONTWAIT, MT_DATA); 1368 if (n && elen >= MLEN) { 1369 MCLGET(n, M_DONTWAIT); 1370 if ((n->m_flags & M_EXT) == 0) { 1371 m_free(n); 1372 n = NULL; 1373 } 1374 } 1375 if (!n) 1376 return NULL; 1377 1378 n->m_len = 0; 1379 if (elen >= M_TRAILINGSPACE(n)) { 1380 m_free(n); 1381 return NULL; 1382 } 1383 1384 m_copydata(m, off, elen, mtod(n, void *)); 1385 n->m_len = elen; 1386 return n; 1387 } 1388 1389 /* 1390 * Get pointer to the previous header followed by the header 1391 * currently processed. 1392 * XXX: This function supposes that 1393 * M includes all headers, 1394 * the next header field and the header length field of each header 1395 * are valid, and 1396 * the sum of each header length equals to OFF. 1397 * Because of these assumptions, this function must be called very 1398 * carefully. Moreover, it will not be used in the near future when 1399 * we develop `neater' mechanism to process extension headers. 1400 */ 1401 u_int8_t * 1402 ip6_get_prevhdr(struct mbuf *m, int off) 1403 { 1404 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1405 1406 if (off == sizeof(struct ip6_hdr)) 1407 return (&ip6->ip6_nxt); 1408 else { 1409 int len, nxt; 1410 struct ip6_ext *ip6e = NULL; 1411 1412 nxt = ip6->ip6_nxt; 1413 len = sizeof(struct ip6_hdr); 1414 while (len < off) { 1415 ip6e = (struct ip6_ext *)(mtod(m, char *) + len); 1416 1417 switch (nxt) { 1418 case IPPROTO_FRAGMENT: 1419 len += sizeof(struct ip6_frag); 1420 break; 1421 case IPPROTO_AH: 1422 len += (ip6e->ip6e_len + 2) << 2; 1423 break; 1424 default: 1425 len += (ip6e->ip6e_len + 1) << 3; 1426 break; 1427 } 1428 nxt = ip6e->ip6e_nxt; 1429 } 1430 if (ip6e) 1431 return (&ip6e->ip6e_nxt); 1432 else 1433 return NULL; 1434 } 1435 } 1436 1437 /* 1438 * get next header offset. m will be retained. 1439 */ 1440 int 1441 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp) 1442 { 1443 struct ip6_hdr ip6; 1444 struct ip6_ext ip6e; 1445 struct ip6_frag fh; 1446 1447 /* just in case */ 1448 if (m == NULL) 1449 panic("ip6_nexthdr: m == NULL"); 1450 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off) 1451 return -1; 1452 1453 switch (proto) { 1454 case IPPROTO_IPV6: 1455 /* do not chase beyond intermediate IPv6 headers */ 1456 if (off != 0) 1457 return -1; 1458 if (m->m_pkthdr.len < off + sizeof(ip6)) 1459 return -1; 1460 m_copydata(m, off, sizeof(ip6), (void *)&ip6); 1461 if (nxtp) 1462 *nxtp = ip6.ip6_nxt; 1463 off += sizeof(ip6); 1464 return off; 1465 1466 case IPPROTO_FRAGMENT: 1467 /* 1468 * terminate parsing if it is not the first fragment, 1469 * it does not make sense to parse through it. 1470 */ 1471 if (m->m_pkthdr.len < off + sizeof(fh)) 1472 return -1; 1473 m_copydata(m, off, sizeof(fh), (void *)&fh); 1474 if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0) 1475 return -1; 1476 if (nxtp) 1477 *nxtp = fh.ip6f_nxt; 1478 off += sizeof(struct ip6_frag); 1479 return off; 1480 1481 case IPPROTO_AH: 1482 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1483 return -1; 1484 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1485 if (nxtp) 1486 *nxtp = ip6e.ip6e_nxt; 1487 off += (ip6e.ip6e_len + 2) << 2; 1488 if (m->m_pkthdr.len < off) 1489 return -1; 1490 return off; 1491 1492 case IPPROTO_HOPOPTS: 1493 case IPPROTO_ROUTING: 1494 case IPPROTO_DSTOPTS: 1495 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1496 return -1; 1497 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1498 if (nxtp) 1499 *nxtp = ip6e.ip6e_nxt; 1500 off += (ip6e.ip6e_len + 1) << 3; 1501 if (m->m_pkthdr.len < off) 1502 return -1; 1503 return off; 1504 1505 case IPPROTO_NONE: 1506 case IPPROTO_ESP: 1507 case IPPROTO_IPCOMP: 1508 /* give up */ 1509 return -1; 1510 1511 default: 1512 return -1; 1513 } 1514 } 1515 1516 /* 1517 * get offset for the last header in the chain. m will be kept untainted. 1518 */ 1519 int 1520 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp) 1521 { 1522 int newoff; 1523 int nxt; 1524 1525 if (!nxtp) { 1526 nxt = -1; 1527 nxtp = &nxt; 1528 } 1529 for (;;) { 1530 newoff = ip6_nexthdr(m, off, proto, nxtp); 1531 if (newoff < 0) 1532 return off; 1533 else if (newoff < off) 1534 return -1; /* invalid */ 1535 else if (newoff == off) 1536 return newoff; 1537 1538 off = newoff; 1539 proto = *nxtp; 1540 } 1541 } 1542 1543 struct m_tag * 1544 ip6_addaux(struct mbuf *m) 1545 { 1546 struct m_tag *mtag; 1547 1548 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1549 if (!mtag) { 1550 mtag = m_tag_get(PACKET_TAG_INET6, sizeof(struct ip6aux), 1551 M_NOWAIT); 1552 if (mtag) { 1553 m_tag_prepend(m, mtag); 1554 bzero(mtag + 1, sizeof(struct ip6aux)); 1555 } 1556 } 1557 return mtag; 1558 } 1559 1560 struct m_tag * 1561 ip6_findaux(struct mbuf *m) 1562 { 1563 struct m_tag *mtag; 1564 1565 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1566 return mtag; 1567 } 1568 1569 void 1570 ip6_delaux(struct mbuf *m) 1571 { 1572 struct m_tag *mtag; 1573 1574 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1575 if (mtag) 1576 m_tag_delete(m, mtag); 1577 } 1578 1579 #ifdef GATEWAY 1580 /* 1581 * sysctl helper routine for net.inet.ip6.maxflows. Since 1582 * we could reduce this value, call ip6flow_reap(); 1583 */ 1584 static int 1585 sysctl_net_inet6_ip6_maxflows(SYSCTLFN_ARGS) 1586 { 1587 int s; 1588 1589 s = sysctl_lookup(SYSCTLFN_CALL(rnode)); 1590 if (s || newp == NULL) 1591 return (s); 1592 1593 s = splsoftnet(); 1594 ip6flow_reap(0); 1595 splx(s); 1596 1597 return (0); 1598 } 1599 1600 static int 1601 sysctl_net_inet6_ip6_hashsize(SYSCTLFN_ARGS) 1602 { 1603 int error, tmp; 1604 struct sysctlnode node; 1605 1606 node = *rnode; 1607 tmp = ip6_hashsize; 1608 node.sysctl_data = &tmp; 1609 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 1610 if (error || newp == NULL) 1611 return (error); 1612 1613 if ((tmp & (tmp - 1)) == 0 && tmp != 0) { 1614 /* 1615 * Can only fail due to malloc() 1616 */ 1617 if (ip6flow_invalidate_all(tmp)) 1618 return ENOMEM; 1619 } else { 1620 /* 1621 * EINVAL if not a power of 2 1622 */ 1623 return EINVAL; 1624 } 1625 1626 return (0); 1627 } 1628 #endif /* GATEWAY */ 1629 1630 /* 1631 * System control for IP6 1632 */ 1633 1634 u_char inet6ctlerrmap[PRC_NCMDS] = { 1635 0, 0, 0, 0, 1636 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 1637 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 1638 EMSGSIZE, EHOSTUNREACH, 0, 0, 1639 0, 0, 0, 0, 1640 ENOPROTOOPT 1641 }; 1642 1643 SYSCTL_SETUP(sysctl_net_inet6_ip6_setup, "sysctl net.inet6.ip6 subtree setup") 1644 { 1645 #ifdef RFC2292 1646 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y)) 1647 #else 1648 #define IS2292(x, y) (y) 1649 #endif 1650 1651 sysctl_createv(clog, 0, NULL, NULL, 1652 CTLFLAG_PERMANENT, 1653 CTLTYPE_NODE, "net", NULL, 1654 NULL, 0, NULL, 0, 1655 CTL_NET, CTL_EOL); 1656 sysctl_createv(clog, 0, NULL, NULL, 1657 CTLFLAG_PERMANENT, 1658 CTLTYPE_NODE, "inet6", 1659 SYSCTL_DESCR("PF_INET6 related settings"), 1660 NULL, 0, NULL, 0, 1661 CTL_NET, PF_INET6, CTL_EOL); 1662 sysctl_createv(clog, 0, NULL, NULL, 1663 CTLFLAG_PERMANENT, 1664 CTLTYPE_NODE, "ip6", 1665 SYSCTL_DESCR("IPv6 related settings"), 1666 NULL, 0, NULL, 0, 1667 CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_EOL); 1668 1669 sysctl_createv(clog, 0, NULL, NULL, 1670 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1671 CTLTYPE_INT, "forwarding", 1672 SYSCTL_DESCR("Enable forwarding of INET6 datagrams"), 1673 NULL, 0, &ip6_forwarding, 0, 1674 CTL_NET, PF_INET6, IPPROTO_IPV6, 1675 IPV6CTL_FORWARDING, CTL_EOL); 1676 sysctl_createv(clog, 0, NULL, NULL, 1677 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1678 CTLTYPE_INT, "redirect", 1679 SYSCTL_DESCR("Enable sending of ICMPv6 redirect messages"), 1680 NULL, 0, &ip6_sendredirects, 0, 1681 CTL_NET, PF_INET6, IPPROTO_IPV6, 1682 IPV6CTL_SENDREDIRECTS, CTL_EOL); 1683 sysctl_createv(clog, 0, NULL, NULL, 1684 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1685 CTLTYPE_INT, "hlim", 1686 SYSCTL_DESCR("Hop limit for an INET6 datagram"), 1687 NULL, 0, &ip6_defhlim, 0, 1688 CTL_NET, PF_INET6, IPPROTO_IPV6, 1689 IPV6CTL_DEFHLIM, CTL_EOL); 1690 #ifdef notyet 1691 sysctl_createv(clog, 0, NULL, NULL, 1692 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1693 CTLTYPE_INT, "mtu", NULL, 1694 NULL, 0, &, 0, 1695 CTL_NET, PF_INET6, IPPROTO_IPV6, 1696 IPV6CTL_DEFMTU, CTL_EOL); 1697 #endif 1698 #ifdef __no_idea__ 1699 sysctl_createv(clog, 0, NULL, NULL, 1700 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1701 CTLTYPE_INT, "forwsrcrt", NULL, 1702 NULL, 0, &?, 0, 1703 CTL_NET, PF_INET6, IPPROTO_IPV6, 1704 IPV6CTL_FORWSRCRT, CTL_EOL); 1705 sysctl_createv(clog, 0, NULL, NULL, 1706 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1707 CTLTYPE_STRUCT, "mrtstats", NULL, 1708 NULL, 0, &?, sizeof(?), 1709 CTL_NET, PF_INET6, IPPROTO_IPV6, 1710 IPV6CTL_MRTSTATS, CTL_EOL); 1711 sysctl_createv(clog, 0, NULL, NULL, 1712 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1713 CTLTYPE_?, "mrtproto", NULL, 1714 NULL, 0, &?, sizeof(?), 1715 CTL_NET, PF_INET6, IPPROTO_IPV6, 1716 IPV6CTL_MRTPROTO, CTL_EOL); 1717 #endif 1718 sysctl_createv(clog, 0, NULL, NULL, 1719 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1720 CTLTYPE_INT, "maxfragpackets", 1721 SYSCTL_DESCR("Maximum number of fragments to buffer " 1722 "for reassembly"), 1723 NULL, 0, &ip6_maxfragpackets, 0, 1724 CTL_NET, PF_INET6, IPPROTO_IPV6, 1725 IPV6CTL_MAXFRAGPACKETS, CTL_EOL); 1726 #ifdef __no_idea__ 1727 sysctl_createv(clog, 0, NULL, NULL, 1728 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1729 CTLTYPE_INT, "sourcecheck", NULL, 1730 NULL, 0, &?, 0, 1731 CTL_NET, PF_INET6, IPPROTO_IPV6, 1732 IPV6CTL_SOURCECHECK, CTL_EOL); 1733 sysctl_createv(clog, 0, NULL, NULL, 1734 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1735 CTLTYPE_INT, "sourcecheck_logint", NULL, 1736 NULL, 0, &?, 0, 1737 CTL_NET, PF_INET6, IPPROTO_IPV6, 1738 IPV6CTL_SOURCECHECK_LOGINT, CTL_EOL); 1739 #endif 1740 sysctl_createv(clog, 0, NULL, NULL, 1741 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1742 CTLTYPE_INT, "accept_rtadv", 1743 SYSCTL_DESCR("Accept router advertisements"), 1744 NULL, 0, &ip6_accept_rtadv, 0, 1745 CTL_NET, PF_INET6, IPPROTO_IPV6, 1746 IPV6CTL_ACCEPT_RTADV, CTL_EOL); 1747 sysctl_createv(clog, 0, NULL, NULL, 1748 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1749 CTLTYPE_INT, "keepfaith", 1750 SYSCTL_DESCR("Activate faith interface"), 1751 NULL, 0, &ip6_keepfaith, 0, 1752 CTL_NET, PF_INET6, IPPROTO_IPV6, 1753 IPV6CTL_KEEPFAITH, CTL_EOL); 1754 sysctl_createv(clog, 0, NULL, NULL, 1755 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1756 CTLTYPE_INT, "log_interval", 1757 SYSCTL_DESCR("Minumum interval between logging " 1758 "unroutable packets"), 1759 NULL, 0, &ip6_log_interval, 0, 1760 CTL_NET, PF_INET6, IPPROTO_IPV6, 1761 IPV6CTL_LOG_INTERVAL, CTL_EOL); 1762 sysctl_createv(clog, 0, NULL, NULL, 1763 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1764 CTLTYPE_INT, "hdrnestlimit", 1765 SYSCTL_DESCR("Maximum number of nested IPv6 headers"), 1766 NULL, 0, &ip6_hdrnestlimit, 0, 1767 CTL_NET, PF_INET6, IPPROTO_IPV6, 1768 IPV6CTL_HDRNESTLIMIT, CTL_EOL); 1769 sysctl_createv(clog, 0, NULL, NULL, 1770 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1771 CTLTYPE_INT, "dad_count", 1772 SYSCTL_DESCR("Number of Duplicate Address Detection " 1773 "probes to send"), 1774 NULL, 0, &ip6_dad_count, 0, 1775 CTL_NET, PF_INET6, IPPROTO_IPV6, 1776 IPV6CTL_DAD_COUNT, CTL_EOL); 1777 sysctl_createv(clog, 0, NULL, NULL, 1778 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1779 CTLTYPE_INT, "auto_flowlabel", 1780 SYSCTL_DESCR("Assign random IPv6 flow labels"), 1781 NULL, 0, &ip6_auto_flowlabel, 0, 1782 CTL_NET, PF_INET6, IPPROTO_IPV6, 1783 IPV6CTL_AUTO_FLOWLABEL, CTL_EOL); 1784 sysctl_createv(clog, 0, NULL, NULL, 1785 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1786 CTLTYPE_INT, "defmcasthlim", 1787 SYSCTL_DESCR("Default multicast hop limit"), 1788 NULL, 0, &ip6_defmcasthlim, 0, 1789 CTL_NET, PF_INET6, IPPROTO_IPV6, 1790 IPV6CTL_DEFMCASTHLIM, CTL_EOL); 1791 #if NGIF > 0 1792 sysctl_createv(clog, 0, NULL, NULL, 1793 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1794 CTLTYPE_INT, "gifhlim", 1795 SYSCTL_DESCR("Default hop limit for a gif tunnel datagram"), 1796 NULL, 0, &ip6_gif_hlim, 0, 1797 CTL_NET, PF_INET6, IPPROTO_IPV6, 1798 IPV6CTL_GIF_HLIM, CTL_EOL); 1799 #endif /* NGIF */ 1800 sysctl_createv(clog, 0, NULL, NULL, 1801 CTLFLAG_PERMANENT, 1802 CTLTYPE_STRING, "kame_version", 1803 SYSCTL_DESCR("KAME Version"), 1804 NULL, 0, __UNCONST(__KAME_VERSION), 0, 1805 CTL_NET, PF_INET6, IPPROTO_IPV6, 1806 IPV6CTL_KAME_VERSION, CTL_EOL); 1807 sysctl_createv(clog, 0, NULL, NULL, 1808 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1809 CTLTYPE_INT, "use_deprecated", 1810 SYSCTL_DESCR("Allow use of deprecated addresses as " 1811 "source addresses"), 1812 NULL, 0, &ip6_use_deprecated, 0, 1813 CTL_NET, PF_INET6, IPPROTO_IPV6, 1814 IPV6CTL_USE_DEPRECATED, CTL_EOL); 1815 sysctl_createv(clog, 0, NULL, NULL, 1816 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1817 CTLTYPE_INT, "rr_prune", NULL, 1818 NULL, 0, &ip6_rr_prune, 0, 1819 CTL_NET, PF_INET6, IPPROTO_IPV6, 1820 IPV6CTL_RR_PRUNE, CTL_EOL); 1821 sysctl_createv(clog, 0, NULL, NULL, 1822 CTLFLAG_PERMANENT 1823 #ifndef INET6_BINDV6ONLY 1824 |CTLFLAG_READWRITE, 1825 #endif 1826 CTLTYPE_INT, "v6only", 1827 SYSCTL_DESCR("Disallow PF_INET6 sockets from connecting " 1828 "to PF_INET sockets"), 1829 NULL, 0, &ip6_v6only, 0, 1830 CTL_NET, PF_INET6, IPPROTO_IPV6, 1831 IPV6CTL_V6ONLY, CTL_EOL); 1832 sysctl_createv(clog, 0, NULL, NULL, 1833 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1834 CTLTYPE_INT, "anonportmin", 1835 SYSCTL_DESCR("Lowest ephemeral port number to assign"), 1836 sysctl_net_inet_ip_ports, 0, &ip6_anonportmin, 0, 1837 CTL_NET, PF_INET6, IPPROTO_IPV6, 1838 IPV6CTL_ANONPORTMIN, CTL_EOL); 1839 sysctl_createv(clog, 0, NULL, NULL, 1840 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1841 CTLTYPE_INT, "anonportmax", 1842 SYSCTL_DESCR("Highest ephemeral port number to assign"), 1843 sysctl_net_inet_ip_ports, 0, &ip6_anonportmax, 0, 1844 CTL_NET, PF_INET6, IPPROTO_IPV6, 1845 IPV6CTL_ANONPORTMAX, CTL_EOL); 1846 #ifndef IPNOPRIVPORTS 1847 sysctl_createv(clog, 0, NULL, NULL, 1848 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1849 CTLTYPE_INT, "lowportmin", 1850 SYSCTL_DESCR("Lowest privileged ephemeral port number " 1851 "to assign"), 1852 sysctl_net_inet_ip_ports, 0, &ip6_lowportmin, 0, 1853 CTL_NET, PF_INET6, IPPROTO_IPV6, 1854 IPV6CTL_LOWPORTMIN, CTL_EOL); 1855 sysctl_createv(clog, 0, NULL, NULL, 1856 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1857 CTLTYPE_INT, "lowportmax", 1858 SYSCTL_DESCR("Highest privileged ephemeral port number " 1859 "to assign"), 1860 sysctl_net_inet_ip_ports, 0, &ip6_lowportmax, 0, 1861 CTL_NET, PF_INET6, IPPROTO_IPV6, 1862 IPV6CTL_LOWPORTMAX, CTL_EOL); 1863 #endif /* IPNOPRIVPORTS */ 1864 sysctl_createv(clog, 0, NULL, NULL, 1865 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1866 CTLTYPE_INT, "use_tempaddr", 1867 SYSCTL_DESCR("Use temporary address"), 1868 NULL, 0, &ip6_use_tempaddr, 0, 1869 CTL_NET, PF_INET6, IPPROTO_IPV6, 1870 CTL_CREATE, CTL_EOL); 1871 sysctl_createv(clog, 0, NULL, NULL, 1872 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1873 CTLTYPE_INT, "temppltime", 1874 SYSCTL_DESCR("preferred lifetime of a temporary address"), 1875 NULL, 0, &ip6_temp_preferred_lifetime, 0, 1876 CTL_NET, PF_INET6, IPPROTO_IPV6, 1877 CTL_CREATE, CTL_EOL); 1878 sysctl_createv(clog, 0, NULL, NULL, 1879 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1880 CTLTYPE_INT, "tempvltime", 1881 SYSCTL_DESCR("valid lifetime of a temporary address"), 1882 NULL, 0, &ip6_temp_valid_lifetime, 0, 1883 CTL_NET, PF_INET6, IPPROTO_IPV6, 1884 CTL_CREATE, CTL_EOL); 1885 sysctl_createv(clog, 0, NULL, NULL, 1886 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1887 CTLTYPE_INT, "maxfrags", 1888 SYSCTL_DESCR("Maximum fragments in reassembly queue"), 1889 NULL, 0, &ip6_maxfrags, 0, 1890 CTL_NET, PF_INET6, IPPROTO_IPV6, 1891 IPV6CTL_MAXFRAGS, CTL_EOL); 1892 sysctl_createv(clog, 0, NULL, NULL, 1893 CTLFLAG_PERMANENT, 1894 CTLTYPE_STRUCT, "stats", 1895 SYSCTL_DESCR("IPv6 statistics"), 1896 NULL, 0, &ip6stat, sizeof(ip6stat), 1897 CTL_NET, PF_INET6, IPPROTO_IPV6, 1898 IPV6CTL_STATS, CTL_EOL); 1899 sysctl_createv(clog, 0, NULL, NULL, 1900 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1901 CTLTYPE_INT, "use_defaultzone", 1902 SYSCTL_DESCR("Whether to use the default scope zones"), 1903 NULL, 0, &ip6_use_defzone, 0, 1904 CTL_NET, PF_INET6, IPPROTO_IPV6, 1905 IPV6CTL_USE_DEFAULTZONE, CTL_EOL); 1906 sysctl_createv(clog, 0, NULL, NULL, 1907 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1908 CTLTYPE_INT, "mcast_pmtu", 1909 SYSCTL_DESCR("Enable pMTU discovery for multicast packet"), 1910 NULL, 0, &ip6_mcast_pmtu, 0, 1911 CTL_NET, PF_INET6, IPPROTO_IPV6, 1912 CTL_CREATE, CTL_EOL); 1913 #ifdef GATEWAY 1914 sysctl_createv(clog, 0, NULL, NULL, 1915 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1916 CTLTYPE_INT, "maxflows", 1917 SYSCTL_DESCR("Number of flows for fast forwarding (IPv6)"), 1918 sysctl_net_inet6_ip6_maxflows, 0, &ip6_maxflows, 0, 1919 CTL_NET, PF_INET6, IPPROTO_IPV6, 1920 CTL_CREATE, CTL_EOL); 1921 sysctl_createv(clog, 0, NULL, NULL, 1922 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1923 CTLTYPE_INT, "hashsize", 1924 SYSCTL_DESCR("Size of hash table for fast forwarding (IPv6)"), 1925 sysctl_net_inet6_ip6_hashsize, 0, &ip6_hashsize, 0, 1926 CTL_NET, PF_INET6, IPPROTO_IPV6, 1927 CTL_CREATE, CTL_EOL); 1928 #endif 1929 } 1930