1 /* $NetBSD: ip6_input.c,v 1.128 2009/09/16 15:23:05 pooka 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 1.128 2009/09/16 15:23:05 pooka Exp $"); 66 67 #include "opt_inet.h" 68 #include "opt_inet6.h" 69 #include "opt_ipsec.h" 70 #include "opt_pfil_hooks.h" 71 #include "opt_compat_netbsd.h" 72 73 #include <sys/param.h> 74 #include <sys/systm.h> 75 #include <sys/malloc.h> 76 #include <sys/mbuf.h> 77 #include <sys/domain.h> 78 #include <sys/protosw.h> 79 #include <sys/socket.h> 80 #include <sys/socketvar.h> 81 #include <sys/errno.h> 82 #include <sys/time.h> 83 #include <sys/kernel.h> 84 #include <sys/syslog.h> 85 #include <sys/proc.h> 86 #include <sys/sysctl.h> 87 88 #include <net/if.h> 89 #include <net/if_types.h> 90 #include <net/if_dl.h> 91 #include <net/route.h> 92 #include <net/netisr.h> 93 #ifdef PFIL_HOOKS 94 #include <net/pfil.h> 95 #endif 96 97 #include <netinet/in.h> 98 #include <netinet/in_systm.h> 99 #ifdef INET 100 #include <netinet/ip.h> 101 #include <netinet/ip_icmp.h> 102 #endif /* INET */ 103 #include <netinet/ip6.h> 104 #include <netinet6/in6_var.h> 105 #include <netinet6/ip6_var.h> 106 #include <netinet6/ip6_private.h> 107 #include <netinet6/in6_pcb.h> 108 #include <netinet/icmp6.h> 109 #include <netinet6/scope6_var.h> 110 #include <netinet6/in6_ifattach.h> 111 #include <netinet6/nd6.h> 112 113 #ifdef IPSEC 114 #include <netinet6/ipsec.h> 115 #include <netinet6/ipsec_private.h> 116 #endif 117 118 #ifdef FAST_IPSEC 119 #include <netipsec/ipsec.h> 120 #include <netipsec/ipsec6.h> 121 #include <netipsec/key.h> 122 #endif /* FAST_IPSEC */ 123 124 #ifdef COMPAT_50 125 #include <compat/sys/time.h> 126 #include <compat/sys/socket.h> 127 #endif 128 129 #include <netinet6/ip6protosw.h> 130 131 #include "faith.h" 132 #include "gif.h" 133 134 #if NGIF > 0 135 #include <netinet6/in6_gif.h> 136 #endif 137 138 #include <net/net_osdep.h> 139 140 extern struct domain inet6domain; 141 142 u_char ip6_protox[IPPROTO_MAX]; 143 static int ip6qmaxlen = IFQ_MAXLEN; 144 struct in6_ifaddr *in6_ifaddr; 145 struct ifqueue ip6intrq; 146 147 extern callout_t in6_tmpaddrtimer_ch; 148 149 int ip6_forward_srcrt; /* XXX */ 150 int ip6_sourcecheck; /* XXX */ 151 int ip6_sourcecheck_interval; /* XXX */ 152 153 #ifdef PFIL_HOOKS 154 struct pfil_head inet6_pfil_hook; 155 #endif 156 157 percpu_t *ip6stat_percpu; 158 159 static void ip6_init2(void *); 160 static struct m_tag *ip6_setdstifaddr(struct mbuf *, const struct in6_ifaddr *); 161 162 static int ip6_hopopts_input(u_int32_t *, u_int32_t *, struct mbuf **, int *); 163 static struct mbuf *ip6_pullexthdr(struct mbuf *, size_t, int); 164 static void sysctl_net_inet6_ip6_setup(struct sysctllog **); 165 166 /* 167 * IP6 initialization: fill in IP6 protocol switch table. 168 * All protocols not implemented in kernel go to raw IP6 protocol handler. 169 */ 170 void 171 ip6_init(void) 172 { 173 const struct ip6protosw *pr; 174 int i; 175 176 sysctl_net_inet6_ip6_setup(NULL); 177 pr = (const struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 178 if (pr == 0) 179 panic("ip6_init"); 180 for (i = 0; i < IPPROTO_MAX; i++) 181 ip6_protox[i] = pr - inet6sw; 182 for (pr = (const struct ip6protosw *)inet6domain.dom_protosw; 183 pr < (const struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++) 184 if (pr->pr_domain->dom_family == PF_INET6 && 185 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) 186 ip6_protox[pr->pr_protocol] = pr - inet6sw; 187 ip6intrq.ifq_maxlen = ip6qmaxlen; 188 scope6_init(); 189 addrsel_policy_init(); 190 nd6_init(); 191 frag6_init(); 192 ip6_desync_factor = arc4random() % MAX_TEMP_DESYNC_FACTOR; 193 194 ip6_init2((void *)0); 195 #ifdef GATEWAY 196 ip6flow_init(ip6_hashsize); 197 #endif 198 199 #ifdef PFIL_HOOKS 200 /* Register our Packet Filter hook. */ 201 inet6_pfil_hook.ph_type = PFIL_TYPE_AF; 202 inet6_pfil_hook.ph_af = AF_INET6; 203 i = pfil_head_register(&inet6_pfil_hook); 204 if (i != 0) 205 printf("ip6_init: WARNING: unable to register pfil hook, " 206 "error %d\n", i); 207 #endif /* PFIL_HOOKS */ 208 209 ip6stat_percpu = percpu_alloc(sizeof(uint64_t) * IP6_NSTATS); 210 } 211 212 static void 213 ip6_init2(void *dummy) 214 { 215 216 /* nd6_timer_init */ 217 callout_init(&nd6_timer_ch, CALLOUT_MPSAFE); 218 callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL); 219 220 /* timer for regeneranation of temporary addresses randomize ID */ 221 callout_init(&in6_tmpaddrtimer_ch, CALLOUT_MPSAFE); 222 callout_reset(&in6_tmpaddrtimer_ch, 223 (ip6_temp_preferred_lifetime - ip6_desync_factor - 224 ip6_temp_regen_advance) * hz, 225 in6_tmpaddrtimer, NULL); 226 } 227 228 /* 229 * IP6 input interrupt handling. Just pass the packet to ip6_input. 230 */ 231 void 232 ip6intr(void) 233 { 234 int s; 235 struct mbuf *m; 236 237 mutex_enter(softnet_lock); 238 KERNEL_LOCK(1, NULL); 239 for (;;) { 240 s = splnet(); 241 IF_DEQUEUE(&ip6intrq, m); 242 splx(s); 243 if (m == 0) 244 break; 245 /* drop the packet if IPv6 operation is disabled on the IF */ 246 if ((ND_IFINFO(m->m_pkthdr.rcvif)->flags & ND6_IFF_IFDISABLED)) { 247 m_freem(m); 248 break; 249 } 250 ip6_input(m); 251 } 252 KERNEL_UNLOCK_ONE(NULL); 253 mutex_exit(softnet_lock); 254 } 255 256 extern struct route ip6_forward_rt; 257 258 void 259 ip6_input(struct mbuf *m) 260 { 261 struct ip6_hdr *ip6; 262 int hit, off = sizeof(struct ip6_hdr), nest; 263 u_int32_t plen; 264 u_int32_t rtalert = ~0; 265 int nxt, ours = 0, rh_present = 0; 266 struct ifnet *deliverifp = NULL; 267 int srcrt = 0; 268 const struct rtentry *rt; 269 union { 270 struct sockaddr dst; 271 struct sockaddr_in6 dst6; 272 } u; 273 #ifdef FAST_IPSEC 274 struct m_tag *mtag; 275 struct tdb_ident *tdbi; 276 struct secpolicy *sp; 277 int s, error; 278 #endif 279 280 #ifdef IPSEC 281 /* 282 * should the inner packet be considered authentic? 283 * see comment in ah4_input(). 284 */ 285 m->m_flags &= ~M_AUTHIPHDR; 286 m->m_flags &= ~M_AUTHIPDGM; 287 #endif 288 289 /* 290 * make sure we don't have onion peering information into m_tag. 291 */ 292 ip6_delaux(m); 293 294 /* 295 * mbuf statistics 296 */ 297 if (m->m_flags & M_EXT) { 298 if (m->m_next) 299 IP6_STATINC(IP6_STAT_MEXT2M); 300 else 301 IP6_STATINC(IP6_STAT_MEXT1); 302 } else { 303 #define M2MMAX 32 304 if (m->m_next) { 305 if (m->m_flags & M_LOOP) { 306 /*XXX*/ IP6_STATINC(IP6_STAT_M2M + lo0ifp->if_index); 307 } else if (m->m_pkthdr.rcvif->if_index < M2MMAX) { 308 IP6_STATINC(IP6_STAT_M2M + 309 m->m_pkthdr.rcvif->if_index); 310 } else 311 IP6_STATINC(IP6_STAT_M2M); 312 } else 313 IP6_STATINC(IP6_STAT_M1); 314 #undef M2MMAX 315 } 316 317 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive); 318 IP6_STATINC(IP6_STAT_TOTAL); 319 320 /* 321 * If the IPv6 header is not aligned, slurp it up into a new 322 * mbuf with space for link headers, in the event we forward 323 * it. Otherwise, if it is aligned, make sure the entire base 324 * IPv6 header is in the first mbuf of the chain. 325 */ 326 if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 327 struct ifnet *inifp = m->m_pkthdr.rcvif; 328 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 329 (max_linkhdr + 3) & ~3)) == NULL) { 330 /* XXXJRT new stat, please */ 331 IP6_STATINC(IP6_STAT_TOOSMALL); 332 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 333 return; 334 } 335 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 336 struct ifnet *inifp = m->m_pkthdr.rcvif; 337 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 338 IP6_STATINC(IP6_STAT_TOOSMALL); 339 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 340 return; 341 } 342 } 343 344 ip6 = mtod(m, struct ip6_hdr *); 345 346 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 347 IP6_STATINC(IP6_STAT_BADVERS); 348 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 349 goto bad; 350 } 351 352 #if defined(IPSEC) 353 /* IPv6 fast forwarding is not compatible with IPsec. */ 354 m->m_flags &= ~M_CANFASTFWD; 355 #else 356 /* 357 * Assume that we can create a fast-forward IP flow entry 358 * based on this packet. 359 */ 360 m->m_flags |= M_CANFASTFWD; 361 #endif 362 363 #ifdef PFIL_HOOKS 364 /* 365 * Run through list of hooks for input packets. If there are any 366 * filters which require that additional packets in the flow are 367 * not fast-forwarded, they must clear the M_CANFASTFWD flag. 368 * Note that filters must _never_ set this flag, as another filter 369 * in the list may have previously cleared it. 370 */ 371 /* 372 * let ipfilter look at packet on the wire, 373 * not the decapsulated packet. 374 */ 375 #ifdef IPSEC 376 if (!ipsec_getnhist(m)) 377 #elif defined(FAST_IPSEC) 378 if (!ipsec_indone(m)) 379 #else 380 if (1) 381 #endif 382 { 383 struct in6_addr odst; 384 385 odst = ip6->ip6_dst; 386 if (pfil_run_hooks(&inet6_pfil_hook, &m, m->m_pkthdr.rcvif, 387 PFIL_IN) != 0) 388 return; 389 if (m == NULL) 390 return; 391 ip6 = mtod(m, struct ip6_hdr *); 392 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst); 393 } 394 #endif /* PFIL_HOOKS */ 395 396 IP6_STATINC(IP6_STAT_NXTHIST + ip6->ip6_nxt); 397 398 #ifdef ALTQ 399 if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) { 400 /* packet is dropped by traffic conditioner */ 401 return; 402 } 403 #endif 404 405 /* 406 * Check against address spoofing/corruption. 407 */ 408 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) || 409 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) { 410 /* 411 * XXX: "badscope" is not very suitable for a multicast source. 412 */ 413 IP6_STATINC(IP6_STAT_BADSCOPE); 414 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 415 goto bad; 416 } 417 /* 418 * The following check is not documented in specs. A malicious 419 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack 420 * and bypass security checks (act as if it was from 127.0.0.1 by using 421 * IPv6 src ::ffff:127.0.0.1). Be cautious. 422 * 423 * This check chokes if we are in an SIIT cloud. As none of BSDs 424 * support IPv4-less kernel compilation, we cannot support SIIT 425 * environment at all. So, it makes more sense for us to reject any 426 * malicious packets for non-SIIT environment, than try to do a 427 * partial support for SIIT environment. 428 */ 429 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 430 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 431 IP6_STATINC(IP6_STAT_BADSCOPE); 432 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 433 goto bad; 434 } 435 #if 0 436 /* 437 * Reject packets with IPv4 compatible addresses (auto tunnel). 438 * 439 * The code forbids auto tunnel relay case in RFC1933 (the check is 440 * stronger than RFC1933). We may want to re-enable it if mech-xx 441 * is revised to forbid relaying case. 442 */ 443 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) || 444 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) { 445 IP6_STATINC(IP6_STAT_BADSCOPE); 446 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 447 goto bad; 448 } 449 #endif 450 451 /* 452 * Disambiguate address scope zones (if there is ambiguity). 453 * We first make sure that the original source or destination address 454 * is not in our internal form for scoped addresses. Such addresses 455 * are not necessarily invalid spec-wise, but we cannot accept them due 456 * to the usage conflict. 457 * in6_setscope() then also checks and rejects the cases where src or 458 * dst are the loopback address and the receiving interface 459 * is not loopback. 460 */ 461 if (__predict_false( 462 m_makewritable(&m, 0, sizeof(struct ip6_hdr), M_DONTWAIT))) 463 goto bad; 464 ip6 = mtod(m, struct ip6_hdr *); 465 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) { 466 IP6_STATINC(IP6_STAT_BADSCOPE); /* XXX */ 467 goto bad; 468 } 469 if (in6_setscope(&ip6->ip6_src, m->m_pkthdr.rcvif, NULL) || 470 in6_setscope(&ip6->ip6_dst, m->m_pkthdr.rcvif, NULL)) { 471 IP6_STATINC(IP6_STAT_BADSCOPE); 472 goto bad; 473 } 474 475 /* 476 * Multicast check 477 */ 478 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 479 struct in6_multi *in6m = 0; 480 481 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast); 482 /* 483 * See if we belong to the destination multicast group on the 484 * arrival interface. 485 */ 486 IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m); 487 if (in6m) 488 ours = 1; 489 else if (!ip6_mrouter) { 490 uint64_t *ip6s = IP6_STAT_GETREF(); 491 ip6s[IP6_STAT_NOTMEMBER]++; 492 ip6s[IP6_STAT_CANTFORWARD]++; 493 IP6_STAT_PUTREF(); 494 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 495 goto bad; 496 } 497 deliverifp = m->m_pkthdr.rcvif; 498 goto hbhcheck; 499 } 500 501 sockaddr_in6_init(&u.dst6, &ip6->ip6_dst, 0, 0, 0); 502 503 /* 504 * Unicast check 505 */ 506 rt = rtcache_lookup2(&ip6_forward_rt, &u.dst, 1, &hit); 507 if (hit) 508 IP6_STATINC(IP6_STAT_FORWARD_CACHEHIT); 509 else 510 IP6_STATINC(IP6_STAT_FORWARD_CACHEMISS); 511 512 #define rt6_getkey(__rt) satocsin6(rt_getkey(__rt)) 513 514 /* 515 * Accept the packet if the forwarding interface to the destination 516 * according to the routing table is the loopback interface, 517 * unless the associated route has a gateway. 518 * Note that this approach causes to accept a packet if there is a 519 * route to the loopback interface for the destination of the packet. 520 * But we think it's even useful in some situations, e.g. when using 521 * a special daemon which wants to intercept the packet. 522 */ 523 if (rt != NULL && 524 (rt->rt_flags & (RTF_HOST|RTF_GATEWAY)) == RTF_HOST && 525 !(rt->rt_flags & RTF_CLONED) && 526 #if 0 527 /* 528 * The check below is redundant since the comparison of 529 * the destination and the key of the rtentry has 530 * already done through looking up the routing table. 531 */ 532 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &rt6_getkey(rt)->sin6_addr) && 533 #endif 534 rt->rt_ifp->if_type == IFT_LOOP) { 535 struct in6_ifaddr *ia6 = (struct in6_ifaddr *)rt->rt_ifa; 536 if (ia6->ia6_flags & IN6_IFF_ANYCAST) 537 m->m_flags |= M_ANYCAST6; 538 /* 539 * packets to a tentative, duplicated, or somehow invalid 540 * address must not be accepted. 541 */ 542 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) { 543 /* this address is ready */ 544 ours = 1; 545 deliverifp = ia6->ia_ifp; /* correct? */ 546 goto hbhcheck; 547 } else { 548 /* address is not ready, so discard the packet. */ 549 nd6log((LOG_INFO, 550 "ip6_input: packet to an unready address %s->%s\n", 551 ip6_sprintf(&ip6->ip6_src), 552 ip6_sprintf(&ip6->ip6_dst))); 553 554 goto bad; 555 } 556 } 557 558 /* 559 * FAITH (Firewall Aided Internet Translator) 560 */ 561 #if defined(NFAITH) && 0 < NFAITH 562 if (ip6_keepfaith) { 563 if (rt != NULL && rt->rt_ifp != NULL && 564 rt->rt_ifp->if_type == IFT_FAITH) { 565 /* XXX do we need more sanity checks? */ 566 ours = 1; 567 deliverifp = rt->rt_ifp; /* faith */ 568 goto hbhcheck; 569 } 570 } 571 #endif 572 573 #if 0 574 { 575 /* 576 * Last resort: check in6_ifaddr for incoming interface. 577 * The code is here until I update the "goto ours hack" code above 578 * working right. 579 */ 580 struct ifaddr *ifa; 581 IFADDR_FOREACH(ifa, m->m_pkthdr.rcvif) { 582 if (ifa->ifa_addr == NULL) 583 continue; /* just for safety */ 584 if (ifa->ifa_addr->sa_family != AF_INET6) 585 continue; 586 if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) { 587 ours = 1; 588 deliverifp = ifa->ifa_ifp; 589 goto hbhcheck; 590 } 591 } 592 } 593 #endif 594 595 /* 596 * Now there is no reason to process the packet if it's not our own 597 * and we're not a router. 598 */ 599 if (!ip6_forwarding) { 600 IP6_STATINC(IP6_STAT_CANTFORWARD); 601 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 602 goto bad; 603 } 604 605 hbhcheck: 606 /* 607 * record address information into m_tag, if we don't have one yet. 608 * note that we are unable to record it, if the address is not listed 609 * as our interface address (e.g. multicast addresses, addresses 610 * within FAITH prefixes and such). 611 */ 612 if (deliverifp && ip6_getdstifaddr(m) == NULL) { 613 struct in6_ifaddr *ia6; 614 615 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 616 if (ia6 != NULL && ip6_setdstifaddr(m, ia6) == NULL) { 617 /* 618 * XXX maybe we should drop the packet here, 619 * as we could not provide enough information 620 * to the upper layers. 621 */ 622 } 623 } 624 625 /* 626 * Process Hop-by-Hop options header if it's contained. 627 * m may be modified in ip6_hopopts_input(). 628 * If a JumboPayload option is included, plen will also be modified. 629 */ 630 plen = (u_int32_t)ntohs(ip6->ip6_plen); 631 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 632 struct ip6_hbh *hbh; 633 634 if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) { 635 #if 0 /*touches NULL pointer*/ 636 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 637 #endif 638 return; /* m have already been freed */ 639 } 640 641 /* adjust pointer */ 642 ip6 = mtod(m, struct ip6_hdr *); 643 644 /* 645 * if the payload length field is 0 and the next header field 646 * indicates Hop-by-Hop Options header, then a Jumbo Payload 647 * option MUST be included. 648 */ 649 if (ip6->ip6_plen == 0 && plen == 0) { 650 /* 651 * Note that if a valid jumbo payload option is 652 * contained, ip6_hopopts_input() must set a valid 653 * (non-zero) payload length to the variable plen. 654 */ 655 IP6_STATINC(IP6_STAT_BADOPTIONS); 656 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 657 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 658 icmp6_error(m, ICMP6_PARAM_PROB, 659 ICMP6_PARAMPROB_HEADER, 660 (char *)&ip6->ip6_plen - (char *)ip6); 661 return; 662 } 663 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 664 sizeof(struct ip6_hbh)); 665 if (hbh == NULL) { 666 IP6_STATINC(IP6_STAT_TOOSHORT); 667 return; 668 } 669 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 670 nxt = hbh->ip6h_nxt; 671 672 /* 673 * accept the packet if a router alert option is included 674 * and we act as an IPv6 router. 675 */ 676 if (rtalert != ~0 && ip6_forwarding) 677 ours = 1; 678 } else 679 nxt = ip6->ip6_nxt; 680 681 /* 682 * Check that the amount of data in the buffers 683 * is as at least much as the IPv6 header would have us expect. 684 * Trim mbufs if longer than we expect. 685 * Drop packet if shorter than we expect. 686 */ 687 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 688 IP6_STATINC(IP6_STAT_TOOSHORT); 689 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 690 goto bad; 691 } 692 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 693 if (m->m_len == m->m_pkthdr.len) { 694 m->m_len = sizeof(struct ip6_hdr) + plen; 695 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 696 } else 697 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 698 } 699 700 /* 701 * Forward if desirable. 702 */ 703 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 704 /* 705 * If we are acting as a multicast router, all 706 * incoming multicast packets are passed to the 707 * kernel-level multicast forwarding function. 708 * The packet is returned (relatively) intact; if 709 * ip6_mforward() returns a non-zero value, the packet 710 * must be discarded, else it may be accepted below. 711 */ 712 if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) { 713 IP6_STATINC(IP6_STAT_CANTFORWARD); 714 m_freem(m); 715 return; 716 } 717 if (!ours) { 718 m_freem(m); 719 return; 720 } 721 } else if (!ours) { 722 ip6_forward(m, srcrt); 723 return; 724 } 725 726 ip6 = mtod(m, struct ip6_hdr *); 727 728 /* 729 * Malicious party may be able to use IPv4 mapped addr to confuse 730 * tcp/udp stack and bypass security checks (act as if it was from 731 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious. 732 * 733 * For SIIT end node behavior, you may want to disable the check. 734 * However, you will become vulnerable to attacks using IPv4 mapped 735 * source. 736 */ 737 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 738 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 739 IP6_STATINC(IP6_STAT_BADSCOPE); 740 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 741 goto bad; 742 } 743 744 /* 745 * Tell launch routine the next header 746 */ 747 #ifdef IFA_STATS 748 if (deliverifp != NULL) { 749 struct in6_ifaddr *ia6; 750 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 751 if (ia6) 752 ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len; 753 } 754 #endif 755 IP6_STATINC(IP6_STAT_DELIVERED); 756 in6_ifstat_inc(deliverifp, ifs6_in_deliver); 757 nest = 0; 758 759 rh_present = 0; 760 while (nxt != IPPROTO_DONE) { 761 if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) { 762 IP6_STATINC(IP6_STAT_TOOMANYHDR); 763 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 764 goto bad; 765 } 766 767 /* 768 * protection against faulty packet - there should be 769 * more sanity checks in header chain processing. 770 */ 771 if (m->m_pkthdr.len < off) { 772 IP6_STATINC(IP6_STAT_TOOSHORT); 773 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 774 goto bad; 775 } 776 777 if (nxt == IPPROTO_ROUTING) { 778 if (rh_present++) { 779 in6_ifstat_inc(m->m_pkthdr.rcvif, 780 ifs6_in_hdrerr); 781 IP6_STATINC(IP6_STAT_BADOPTIONS); 782 goto bad; 783 } 784 } 785 786 #ifdef IPSEC 787 /* 788 * enforce IPsec policy checking if we are seeing last header. 789 * note that we do not visit this with protocols with pcb layer 790 * code - like udp/tcp/raw ip. 791 */ 792 if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 && 793 ipsec6_in_reject(m, NULL)) { 794 IPSEC6_STATINC(IPSEC_STAT_IN_POLVIO); 795 goto bad; 796 } 797 #endif 798 #ifdef FAST_IPSEC 799 /* 800 * enforce IPsec policy checking if we are seeing last header. 801 * note that we do not visit this with protocols with pcb layer 802 * code - like udp/tcp/raw ip. 803 */ 804 if ((inet6sw[ip_protox[nxt]].pr_flags & PR_LASTHDR) != 0) { 805 /* 806 * Check if the packet has already had IPsec processing 807 * done. If so, then just pass it along. This tag gets 808 * set during AH, ESP, etc. input handling, before the 809 * packet is returned to the ip input queue for delivery. 810 */ 811 mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL); 812 s = splsoftnet(); 813 if (mtag != NULL) { 814 tdbi = (struct tdb_ident *)(mtag + 1); 815 sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND); 816 } else { 817 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, 818 IP_FORWARDING, &error); 819 } 820 if (sp != NULL) { 821 /* 822 * Check security policy against packet attributes. 823 */ 824 error = ipsec_in_reject(sp, m); 825 KEY_FREESP(&sp); 826 } else { 827 /* XXX error stat??? */ 828 error = EINVAL; 829 DPRINTF(("ip6_input: no SP, packet discarded\n"));/*XXX*/ 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(struct mbuf *m, const struct in6_ifaddr *ia) 850 { 851 struct m_tag *mtag; 852 853 mtag = ip6_addaux(m); 854 if (mtag != NULL) { 855 struct ip6aux *ip6a; 856 857 ip6a = (struct ip6aux *)(mtag + 1); 858 in6_setscope(&ip6a->ip6a_src, ia->ia_ifp, &ip6a->ip6a_scope_id); 859 ip6a->ip6a_src = ia->ia_addr.sin6_addr; 860 ip6a->ip6a_flags = ia->ia6_flags; 861 } 862 return mtag; /* NULL if failed to set */ 863 } 864 865 const struct ip6aux * 866 ip6_getdstifaddr(struct mbuf *m) 867 { 868 struct m_tag *mtag; 869 870 mtag = ip6_findaux(m); 871 if (mtag != NULL) 872 return (struct ip6aux *)(mtag + 1); 873 else 874 return NULL; 875 } 876 877 /* 878 * Hop-by-Hop options header processing. If a valid jumbo payload option is 879 * included, the real payload length will be stored in plenp. 880 * 881 * rtalertp - XXX: should be stored more smart way 882 */ 883 static int 884 ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp, 885 struct mbuf **mp, int *offp) 886 { 887 struct mbuf *m = *mp; 888 int off = *offp, hbhlen; 889 struct ip6_hbh *hbh; 890 891 /* validation of the length of the header */ 892 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, 893 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh)); 894 if (hbh == NULL) { 895 IP6_STATINC(IP6_STAT_TOOSHORT); 896 return -1; 897 } 898 hbhlen = (hbh->ip6h_len + 1) << 3; 899 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 900 hbhlen); 901 if (hbh == NULL) { 902 IP6_STATINC(IP6_STAT_TOOSHORT); 903 return -1; 904 } 905 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 906 off += hbhlen; 907 hbhlen -= sizeof(struct ip6_hbh); 908 909 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 910 hbhlen, rtalertp, plenp) < 0) 911 return (-1); 912 913 *offp = off; 914 *mp = m; 915 return (0); 916 } 917 918 /* 919 * Search header for all Hop-by-hop options and process each option. 920 * This function is separate from ip6_hopopts_input() in order to 921 * handle a case where the sending node itself process its hop-by-hop 922 * options header. In such a case, the function is called from ip6_output(). 923 * 924 * The function assumes that hbh header is located right after the IPv6 header 925 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to 926 * opthead + hbhlen is located in continuous memory region. 927 */ 928 int 929 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen, 930 u_int32_t *rtalertp, u_int32_t *plenp) 931 { 932 struct ip6_hdr *ip6; 933 int optlen = 0; 934 u_int8_t *opt = opthead; 935 u_int16_t rtalert_val; 936 u_int32_t jumboplen; 937 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh); 938 939 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 940 switch (*opt) { 941 case IP6OPT_PAD1: 942 optlen = 1; 943 break; 944 case IP6OPT_PADN: 945 if (hbhlen < IP6OPT_MINLEN) { 946 IP6_STATINC(IP6_STAT_TOOSMALL); 947 goto bad; 948 } 949 optlen = *(opt + 1) + 2; 950 break; 951 case IP6OPT_RTALERT: 952 /* XXX may need check for alignment */ 953 if (hbhlen < IP6OPT_RTALERT_LEN) { 954 IP6_STATINC(IP6_STAT_TOOSMALL); 955 goto bad; 956 } 957 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) { 958 /* XXX stat */ 959 icmp6_error(m, ICMP6_PARAM_PROB, 960 ICMP6_PARAMPROB_HEADER, 961 erroff + opt + 1 - opthead); 962 return (-1); 963 } 964 optlen = IP6OPT_RTALERT_LEN; 965 memcpy((void *)&rtalert_val, (void *)(opt + 2), 2); 966 *rtalertp = ntohs(rtalert_val); 967 break; 968 case IP6OPT_JUMBO: 969 /* XXX may need check for alignment */ 970 if (hbhlen < IP6OPT_JUMBO_LEN) { 971 IP6_STATINC(IP6_STAT_TOOSMALL); 972 goto bad; 973 } 974 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) { 975 /* XXX stat */ 976 icmp6_error(m, ICMP6_PARAM_PROB, 977 ICMP6_PARAMPROB_HEADER, 978 erroff + opt + 1 - opthead); 979 return (-1); 980 } 981 optlen = IP6OPT_JUMBO_LEN; 982 983 /* 984 * IPv6 packets that have non 0 payload length 985 * must not contain a jumbo payload option. 986 */ 987 ip6 = mtod(m, struct ip6_hdr *); 988 if (ip6->ip6_plen) { 989 IP6_STATINC(IP6_STAT_BADOPTIONS); 990 icmp6_error(m, ICMP6_PARAM_PROB, 991 ICMP6_PARAMPROB_HEADER, 992 erroff + opt - opthead); 993 return (-1); 994 } 995 996 /* 997 * We may see jumbolen in unaligned location, so 998 * we'd need to perform bcopy(). 999 */ 1000 memcpy(&jumboplen, opt + 2, sizeof(jumboplen)); 1001 jumboplen = (u_int32_t)htonl(jumboplen); 1002 1003 #if 1 1004 /* 1005 * if there are multiple jumbo payload options, 1006 * *plenp will be non-zero and the packet will be 1007 * rejected. 1008 * the behavior may need some debate in ipngwg - 1009 * multiple options does not make sense, however, 1010 * there's no explicit mention in specification. 1011 */ 1012 if (*plenp != 0) { 1013 IP6_STATINC(IP6_STAT_BADOPTIONS); 1014 icmp6_error(m, ICMP6_PARAM_PROB, 1015 ICMP6_PARAMPROB_HEADER, 1016 erroff + opt + 2 - opthead); 1017 return (-1); 1018 } 1019 #endif 1020 1021 /* 1022 * jumbo payload length must be larger than 65535. 1023 */ 1024 if (jumboplen <= IPV6_MAXPACKET) { 1025 IP6_STATINC(IP6_STAT_BADOPTIONS); 1026 icmp6_error(m, ICMP6_PARAM_PROB, 1027 ICMP6_PARAMPROB_HEADER, 1028 erroff + opt + 2 - opthead); 1029 return (-1); 1030 } 1031 *plenp = jumboplen; 1032 1033 break; 1034 default: /* unknown option */ 1035 if (hbhlen < IP6OPT_MINLEN) { 1036 IP6_STATINC(IP6_STAT_TOOSMALL); 1037 goto bad; 1038 } 1039 optlen = ip6_unknown_opt(opt, m, 1040 erroff + opt - opthead); 1041 if (optlen == -1) 1042 return (-1); 1043 optlen += 2; 1044 break; 1045 } 1046 } 1047 1048 return (0); 1049 1050 bad: 1051 m_freem(m); 1052 return (-1); 1053 } 1054 1055 /* 1056 * Unknown option processing. 1057 * The third argument `off' is the offset from the IPv6 header to the option, 1058 * which is necessary if the IPv6 header the and option header and IPv6 header 1059 * is not continuous in order to return an ICMPv6 error. 1060 */ 1061 int 1062 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off) 1063 { 1064 struct ip6_hdr *ip6; 1065 1066 switch (IP6OPT_TYPE(*optp)) { 1067 case IP6OPT_TYPE_SKIP: /* ignore the option */ 1068 return ((int)*(optp + 1)); 1069 case IP6OPT_TYPE_DISCARD: /* silently discard */ 1070 m_freem(m); 1071 return (-1); 1072 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 1073 IP6_STATINC(IP6_STAT_BADOPTIONS); 1074 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 1075 return (-1); 1076 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 1077 IP6_STATINC(IP6_STAT_BADOPTIONS); 1078 ip6 = mtod(m, struct ip6_hdr *); 1079 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 1080 (m->m_flags & (M_BCAST|M_MCAST))) 1081 m_freem(m); 1082 else 1083 icmp6_error(m, ICMP6_PARAM_PROB, 1084 ICMP6_PARAMPROB_OPTION, off); 1085 return (-1); 1086 } 1087 1088 m_freem(m); /* XXX: NOTREACHED */ 1089 return (-1); 1090 } 1091 1092 /* 1093 * Create the "control" list for this pcb. 1094 * 1095 * The routine will be called from upper layer handlers like tcp6_input(). 1096 * Thus the routine assumes that the caller (tcp6_input) have already 1097 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the 1098 * very first mbuf on the mbuf chain. 1099 * We may want to add some infinite loop prevention or sanity checks for safety. 1100 * (This applies only when you are using KAME mbuf chain restriction, i.e. 1101 * you are using IP6_EXTHDR_CHECK() not m_pulldown()) 1102 */ 1103 void 1104 ip6_savecontrol(struct in6pcb *in6p, struct mbuf **mp, 1105 struct ip6_hdr *ip6, struct mbuf *m) 1106 { 1107 #ifdef RFC2292 1108 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y)) 1109 #else 1110 #define IS2292(x, y) (y) 1111 #endif 1112 1113 if (in6p->in6p_socket->so_options & SO_TIMESTAMP 1114 #ifdef SO_OTIMESTAMP 1115 || in6p->in6p_socket->so_options & SO_OTIMESTAMP 1116 #endif 1117 ) { 1118 struct timeval tv; 1119 1120 microtime(&tv); 1121 #ifdef SO_OTIMESTAMP 1122 if (in6p->in6p_socket->so_options & SO_OTIMESTAMP) { 1123 struct timeval50 tv50; 1124 timeval_to_timeval50(&tv, &tv50); 1125 *mp = sbcreatecontrol((void *) &tv50, sizeof(tv50), 1126 SCM_OTIMESTAMP, SOL_SOCKET); 1127 } else 1128 #endif 1129 *mp = sbcreatecontrol((void *) &tv, sizeof(tv), 1130 SCM_TIMESTAMP, SOL_SOCKET); 1131 if (*mp) 1132 mp = &(*mp)->m_next; 1133 } 1134 1135 /* some OSes call this logic with IPv4 packet, for SO_TIMESTAMP */ 1136 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) 1137 return; 1138 1139 /* RFC 2292 sec. 5 */ 1140 if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) { 1141 struct in6_pktinfo pi6; 1142 1143 memcpy(&pi6.ipi6_addr, &ip6->ip6_dst, sizeof(struct in6_addr)); 1144 in6_clearscope(&pi6.ipi6_addr); /* XXX */ 1145 pi6.ipi6_ifindex = m->m_pkthdr.rcvif ? 1146 m->m_pkthdr.rcvif->if_index : 0; 1147 *mp = sbcreatecontrol((void *) &pi6, 1148 sizeof(struct in6_pktinfo), 1149 IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6); 1150 if (*mp) 1151 mp = &(*mp)->m_next; 1152 } 1153 1154 if (in6p->in6p_flags & IN6P_HOPLIMIT) { 1155 int hlim = ip6->ip6_hlim & 0xff; 1156 1157 *mp = sbcreatecontrol((void *) &hlim, sizeof(int), 1158 IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6); 1159 if (*mp) 1160 mp = &(*mp)->m_next; 1161 } 1162 1163 if ((in6p->in6p_flags & IN6P_TCLASS) != 0) { 1164 u_int32_t flowinfo; 1165 int tclass; 1166 1167 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK); 1168 flowinfo >>= 20; 1169 1170 tclass = flowinfo & 0xff; 1171 *mp = sbcreatecontrol((void *)&tclass, sizeof(tclass), 1172 IPV6_TCLASS, IPPROTO_IPV6); 1173 1174 if (*mp) 1175 mp = &(*mp)->m_next; 1176 } 1177 1178 /* 1179 * IPV6_HOPOPTS socket option. Recall that we required super-user 1180 * privilege for the option (see ip6_ctloutput), but it might be too 1181 * strict, since there might be some hop-by-hop options which can be 1182 * returned to normal user. 1183 * See also RFC3542 section 8 (or RFC2292 section 6). 1184 */ 1185 if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0) { 1186 /* 1187 * Check if a hop-by-hop options header is contatined in the 1188 * received packet, and if so, store the options as ancillary 1189 * data. Note that a hop-by-hop options header must be 1190 * just after the IPv6 header, which fact is assured through 1191 * the IPv6 input processing. 1192 */ 1193 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1194 if (xip6->ip6_nxt == IPPROTO_HOPOPTS) { 1195 struct ip6_hbh *hbh; 1196 int hbhlen; 1197 struct mbuf *ext; 1198 1199 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr), 1200 xip6->ip6_nxt); 1201 if (ext == NULL) { 1202 IP6_STATINC(IP6_STAT_TOOSHORT); 1203 return; 1204 } 1205 hbh = mtod(ext, struct ip6_hbh *); 1206 hbhlen = (hbh->ip6h_len + 1) << 3; 1207 if (hbhlen != ext->m_len) { 1208 m_freem(ext); 1209 IP6_STATINC(IP6_STAT_TOOSHORT); 1210 return; 1211 } 1212 1213 /* 1214 * XXX: We copy whole the header even if a jumbo 1215 * payload option is included, which option is to 1216 * be removed before returning in the RFC 2292. 1217 * Note: this constraint is removed in RFC3542. 1218 */ 1219 *mp = sbcreatecontrol((void *)hbh, hbhlen, 1220 IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS), 1221 IPPROTO_IPV6); 1222 if (*mp) 1223 mp = &(*mp)->m_next; 1224 m_freem(ext); 1225 } 1226 } 1227 1228 /* IPV6_DSTOPTS and IPV6_RTHDR socket options */ 1229 if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) { 1230 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1231 int nxt = xip6->ip6_nxt, off = sizeof(struct ip6_hdr); 1232 1233 /* 1234 * Search for destination options headers or routing 1235 * header(s) through the header chain, and stores each 1236 * header as ancillary data. 1237 * Note that the order of the headers remains in 1238 * the chain of ancillary data. 1239 */ 1240 for (;;) { /* is explicit loop prevention necessary? */ 1241 struct ip6_ext *ip6e = NULL; 1242 int elen; 1243 struct mbuf *ext = NULL; 1244 1245 /* 1246 * if it is not an extension header, don't try to 1247 * pull it from the chain. 1248 */ 1249 switch (nxt) { 1250 case IPPROTO_DSTOPTS: 1251 case IPPROTO_ROUTING: 1252 case IPPROTO_HOPOPTS: 1253 case IPPROTO_AH: /* is it possible? */ 1254 break; 1255 default: 1256 goto loopend; 1257 } 1258 1259 ext = ip6_pullexthdr(m, off, nxt); 1260 if (ext == NULL) { 1261 IP6_STATINC(IP6_STAT_TOOSHORT); 1262 return; 1263 } 1264 ip6e = mtod(ext, struct ip6_ext *); 1265 if (nxt == IPPROTO_AH) 1266 elen = (ip6e->ip6e_len + 2) << 2; 1267 else 1268 elen = (ip6e->ip6e_len + 1) << 3; 1269 if (elen != ext->m_len) { 1270 m_freem(ext); 1271 IP6_STATINC(IP6_STAT_TOOSHORT); 1272 return; 1273 } 1274 KASSERT(IP6_HDR_ALIGNED_P(ip6e)); 1275 1276 switch (nxt) { 1277 case IPPROTO_DSTOPTS: 1278 if (!(in6p->in6p_flags & IN6P_DSTOPTS)) 1279 break; 1280 1281 *mp = sbcreatecontrol((void *)ip6e, elen, 1282 IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS), 1283 IPPROTO_IPV6); 1284 if (*mp) 1285 mp = &(*mp)->m_next; 1286 break; 1287 1288 case IPPROTO_ROUTING: 1289 if (!(in6p->in6p_flags & IN6P_RTHDR)) 1290 break; 1291 1292 *mp = sbcreatecontrol((void *)ip6e, elen, 1293 IS2292(IPV6_2292RTHDR, IPV6_RTHDR), 1294 IPPROTO_IPV6); 1295 if (*mp) 1296 mp = &(*mp)->m_next; 1297 break; 1298 1299 case IPPROTO_HOPOPTS: 1300 case IPPROTO_AH: /* is it possible? */ 1301 break; 1302 1303 default: 1304 /* 1305 * other cases have been filtered in the above. 1306 * none will visit this case. here we supply 1307 * the code just in case (nxt overwritten or 1308 * other cases). 1309 */ 1310 m_freem(ext); 1311 goto loopend; 1312 1313 } 1314 1315 /* proceed with the next header. */ 1316 off += elen; 1317 nxt = ip6e->ip6e_nxt; 1318 ip6e = NULL; 1319 m_freem(ext); 1320 ext = NULL; 1321 } 1322 loopend: 1323 ; 1324 } 1325 } 1326 #undef IS2292 1327 1328 1329 void 1330 ip6_notify_pmtu(struct in6pcb *in6p, const struct sockaddr_in6 *dst, 1331 uint32_t *mtu) 1332 { 1333 struct socket *so; 1334 struct mbuf *m_mtu; 1335 struct ip6_mtuinfo mtuctl; 1336 1337 so = in6p->in6p_socket; 1338 1339 if (mtu == NULL) 1340 return; 1341 1342 #ifdef DIAGNOSTIC 1343 if (so == NULL) /* I believe this is impossible */ 1344 panic("ip6_notify_pmtu: socket is NULL"); 1345 #endif 1346 1347 memset(&mtuctl, 0, sizeof(mtuctl)); /* zero-clear for safety */ 1348 mtuctl.ip6m_mtu = *mtu; 1349 mtuctl.ip6m_addr = *dst; 1350 if (sa6_recoverscope(&mtuctl.ip6m_addr)) 1351 return; 1352 1353 if ((m_mtu = sbcreatecontrol((void *)&mtuctl, sizeof(mtuctl), 1354 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL) 1355 return; 1356 1357 if (sbappendaddr(&so->so_rcv, (const struct sockaddr *)dst, NULL, m_mtu) 1358 == 0) { 1359 m_freem(m_mtu); 1360 /* XXX: should count statistics */ 1361 } else 1362 sorwakeup(so); 1363 1364 return; 1365 } 1366 1367 /* 1368 * pull single extension header from mbuf chain. returns single mbuf that 1369 * contains the result, or NULL on error. 1370 */ 1371 static struct mbuf * 1372 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt) 1373 { 1374 struct ip6_ext ip6e; 1375 size_t elen; 1376 struct mbuf *n; 1377 1378 #ifdef DIAGNOSTIC 1379 switch (nxt) { 1380 case IPPROTO_DSTOPTS: 1381 case IPPROTO_ROUTING: 1382 case IPPROTO_HOPOPTS: 1383 case IPPROTO_AH: /* is it possible? */ 1384 break; 1385 default: 1386 printf("ip6_pullexthdr: invalid nxt=%d\n", nxt); 1387 } 1388 #endif 1389 1390 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1391 if (nxt == IPPROTO_AH) 1392 elen = (ip6e.ip6e_len + 2) << 2; 1393 else 1394 elen = (ip6e.ip6e_len + 1) << 3; 1395 1396 MGET(n, M_DONTWAIT, MT_DATA); 1397 if (n && elen >= MLEN) { 1398 MCLGET(n, M_DONTWAIT); 1399 if ((n->m_flags & M_EXT) == 0) { 1400 m_free(n); 1401 n = NULL; 1402 } 1403 } 1404 if (!n) 1405 return NULL; 1406 1407 n->m_len = 0; 1408 if (elen >= M_TRAILINGSPACE(n)) { 1409 m_free(n); 1410 return NULL; 1411 } 1412 1413 m_copydata(m, off, elen, mtod(n, void *)); 1414 n->m_len = elen; 1415 return n; 1416 } 1417 1418 /* 1419 * Get pointer to the previous header followed by the header 1420 * currently processed. 1421 * XXX: This function supposes that 1422 * M includes all headers, 1423 * the next header field and the header length field of each header 1424 * are valid, and 1425 * the sum of each header length equals to OFF. 1426 * Because of these assumptions, this function must be called very 1427 * carefully. Moreover, it will not be used in the near future when 1428 * we develop `neater' mechanism to process extension headers. 1429 */ 1430 u_int8_t * 1431 ip6_get_prevhdr(struct mbuf *m, int off) 1432 { 1433 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1434 1435 if (off == sizeof(struct ip6_hdr)) 1436 return (&ip6->ip6_nxt); 1437 else { 1438 int len, nxt; 1439 struct ip6_ext *ip6e = NULL; 1440 1441 nxt = ip6->ip6_nxt; 1442 len = sizeof(struct ip6_hdr); 1443 while (len < off) { 1444 ip6e = (struct ip6_ext *)(mtod(m, char *) + len); 1445 1446 switch (nxt) { 1447 case IPPROTO_FRAGMENT: 1448 len += sizeof(struct ip6_frag); 1449 break; 1450 case IPPROTO_AH: 1451 len += (ip6e->ip6e_len + 2) << 2; 1452 break; 1453 default: 1454 len += (ip6e->ip6e_len + 1) << 3; 1455 break; 1456 } 1457 nxt = ip6e->ip6e_nxt; 1458 } 1459 if (ip6e) 1460 return (&ip6e->ip6e_nxt); 1461 else 1462 return NULL; 1463 } 1464 } 1465 1466 /* 1467 * get next header offset. m will be retained. 1468 */ 1469 int 1470 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp) 1471 { 1472 struct ip6_hdr ip6; 1473 struct ip6_ext ip6e; 1474 struct ip6_frag fh; 1475 1476 /* just in case */ 1477 if (m == NULL) 1478 panic("ip6_nexthdr: m == NULL"); 1479 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off) 1480 return -1; 1481 1482 switch (proto) { 1483 case IPPROTO_IPV6: 1484 /* do not chase beyond intermediate IPv6 headers */ 1485 if (off != 0) 1486 return -1; 1487 if (m->m_pkthdr.len < off + sizeof(ip6)) 1488 return -1; 1489 m_copydata(m, off, sizeof(ip6), (void *)&ip6); 1490 if (nxtp) 1491 *nxtp = ip6.ip6_nxt; 1492 off += sizeof(ip6); 1493 return off; 1494 1495 case IPPROTO_FRAGMENT: 1496 /* 1497 * terminate parsing if it is not the first fragment, 1498 * it does not make sense to parse through it. 1499 */ 1500 if (m->m_pkthdr.len < off + sizeof(fh)) 1501 return -1; 1502 m_copydata(m, off, sizeof(fh), (void *)&fh); 1503 if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0) 1504 return -1; 1505 if (nxtp) 1506 *nxtp = fh.ip6f_nxt; 1507 off += sizeof(struct ip6_frag); 1508 return off; 1509 1510 case IPPROTO_AH: 1511 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1512 return -1; 1513 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1514 if (nxtp) 1515 *nxtp = ip6e.ip6e_nxt; 1516 off += (ip6e.ip6e_len + 2) << 2; 1517 if (m->m_pkthdr.len < off) 1518 return -1; 1519 return off; 1520 1521 case IPPROTO_HOPOPTS: 1522 case IPPROTO_ROUTING: 1523 case IPPROTO_DSTOPTS: 1524 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1525 return -1; 1526 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1527 if (nxtp) 1528 *nxtp = ip6e.ip6e_nxt; 1529 off += (ip6e.ip6e_len + 1) << 3; 1530 if (m->m_pkthdr.len < off) 1531 return -1; 1532 return off; 1533 1534 case IPPROTO_NONE: 1535 case IPPROTO_ESP: 1536 case IPPROTO_IPCOMP: 1537 /* give up */ 1538 return -1; 1539 1540 default: 1541 return -1; 1542 } 1543 } 1544 1545 /* 1546 * get offset for the last header in the chain. m will be kept untainted. 1547 */ 1548 int 1549 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp) 1550 { 1551 int newoff; 1552 int nxt; 1553 1554 if (!nxtp) { 1555 nxt = -1; 1556 nxtp = &nxt; 1557 } 1558 for (;;) { 1559 newoff = ip6_nexthdr(m, off, proto, nxtp); 1560 if (newoff < 0) 1561 return off; 1562 else if (newoff < off) 1563 return -1; /* invalid */ 1564 else if (newoff == off) 1565 return newoff; 1566 1567 off = newoff; 1568 proto = *nxtp; 1569 } 1570 } 1571 1572 struct m_tag * 1573 ip6_addaux(struct mbuf *m) 1574 { 1575 struct m_tag *mtag; 1576 1577 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1578 if (!mtag) { 1579 mtag = m_tag_get(PACKET_TAG_INET6, sizeof(struct ip6aux), 1580 M_NOWAIT); 1581 if (mtag) { 1582 m_tag_prepend(m, mtag); 1583 memset(mtag + 1, 0, sizeof(struct ip6aux)); 1584 } 1585 } 1586 return mtag; 1587 } 1588 1589 struct m_tag * 1590 ip6_findaux(struct mbuf *m) 1591 { 1592 struct m_tag *mtag; 1593 1594 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1595 return mtag; 1596 } 1597 1598 void 1599 ip6_delaux(struct mbuf *m) 1600 { 1601 struct m_tag *mtag; 1602 1603 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1604 if (mtag) 1605 m_tag_delete(m, mtag); 1606 } 1607 1608 #ifdef GATEWAY 1609 /* 1610 * sysctl helper routine for net.inet.ip6.maxflows. Since 1611 * we could reduce this value, call ip6flow_reap(); 1612 */ 1613 static int 1614 sysctl_net_inet6_ip6_maxflows(SYSCTLFN_ARGS) 1615 { 1616 int error; 1617 1618 error = sysctl_lookup(SYSCTLFN_CALL(rnode)); 1619 if (error || newp == NULL) 1620 return (error); 1621 1622 mutex_enter(softnet_lock); 1623 KERNEL_LOCK(1, NULL); 1624 1625 ip6flow_reap(0); 1626 1627 KERNEL_UNLOCK_ONE(NULL); 1628 mutex_exit(softnet_lock); 1629 1630 return (0); 1631 } 1632 1633 static int 1634 sysctl_net_inet6_ip6_hashsize(SYSCTLFN_ARGS) 1635 { 1636 int error, tmp; 1637 struct sysctlnode node; 1638 1639 node = *rnode; 1640 tmp = ip6_hashsize; 1641 node.sysctl_data = &tmp; 1642 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 1643 if (error || newp == NULL) 1644 return (error); 1645 1646 if ((tmp & (tmp - 1)) == 0 && tmp != 0) { 1647 /* 1648 * Can only fail due to malloc() 1649 */ 1650 mutex_enter(softnet_lock); 1651 KERNEL_LOCK(1, NULL); 1652 1653 error = ip6flow_invalidate_all(tmp); 1654 1655 KERNEL_UNLOCK_ONE(NULL); 1656 mutex_exit(softnet_lock); 1657 } else { 1658 /* 1659 * EINVAL if not a power of 2 1660 */ 1661 error = EINVAL; 1662 } 1663 1664 return error; 1665 } 1666 #endif /* GATEWAY */ 1667 1668 /* 1669 * System control for IP6 1670 */ 1671 1672 const u_char inet6ctlerrmap[PRC_NCMDS] = { 1673 0, 0, 0, 0, 1674 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 1675 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 1676 EMSGSIZE, EHOSTUNREACH, 0, 0, 1677 0, 0, 0, 0, 1678 ENOPROTOOPT 1679 }; 1680 1681 static int 1682 sysctl_net_inet6_ip6_stats(SYSCTLFN_ARGS) 1683 { 1684 1685 return (NETSTAT_SYSCTL(ip6stat_percpu, IP6_NSTATS)); 1686 } 1687 1688 static void 1689 sysctl_net_inet6_ip6_setup(struct sysctllog **clog) 1690 { 1691 #ifdef RFC2292 1692 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y)) 1693 #else 1694 #define IS2292(x, y) (y) 1695 #endif 1696 1697 sysctl_createv(clog, 0, NULL, NULL, 1698 CTLFLAG_PERMANENT, 1699 CTLTYPE_NODE, "net", NULL, 1700 NULL, 0, NULL, 0, 1701 CTL_NET, CTL_EOL); 1702 sysctl_createv(clog, 0, NULL, NULL, 1703 CTLFLAG_PERMANENT, 1704 CTLTYPE_NODE, "inet6", 1705 SYSCTL_DESCR("PF_INET6 related settings"), 1706 NULL, 0, NULL, 0, 1707 CTL_NET, PF_INET6, CTL_EOL); 1708 sysctl_createv(clog, 0, NULL, NULL, 1709 CTLFLAG_PERMANENT, 1710 CTLTYPE_NODE, "ip6", 1711 SYSCTL_DESCR("IPv6 related settings"), 1712 NULL, 0, NULL, 0, 1713 CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_EOL); 1714 1715 sysctl_createv(clog, 0, NULL, NULL, 1716 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1717 CTLTYPE_INT, "forwarding", 1718 SYSCTL_DESCR("Enable forwarding of INET6 datagrams"), 1719 NULL, 0, &ip6_forwarding, 0, 1720 CTL_NET, PF_INET6, IPPROTO_IPV6, 1721 IPV6CTL_FORWARDING, CTL_EOL); 1722 sysctl_createv(clog, 0, NULL, NULL, 1723 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1724 CTLTYPE_INT, "redirect", 1725 SYSCTL_DESCR("Enable sending of ICMPv6 redirect messages"), 1726 NULL, 0, &ip6_sendredirects, 0, 1727 CTL_NET, PF_INET6, IPPROTO_IPV6, 1728 IPV6CTL_SENDREDIRECTS, CTL_EOL); 1729 sysctl_createv(clog, 0, NULL, NULL, 1730 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1731 CTLTYPE_INT, "hlim", 1732 SYSCTL_DESCR("Hop limit for an INET6 datagram"), 1733 NULL, 0, &ip6_defhlim, 0, 1734 CTL_NET, PF_INET6, IPPROTO_IPV6, 1735 IPV6CTL_DEFHLIM, CTL_EOL); 1736 #ifdef notyet 1737 sysctl_createv(clog, 0, NULL, NULL, 1738 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1739 CTLTYPE_INT, "mtu", NULL, 1740 NULL, 0, &, 0, 1741 CTL_NET, PF_INET6, IPPROTO_IPV6, 1742 IPV6CTL_DEFMTU, CTL_EOL); 1743 #endif 1744 #ifdef __no_idea__ 1745 sysctl_createv(clog, 0, NULL, NULL, 1746 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1747 CTLTYPE_INT, "forwsrcrt", NULL, 1748 NULL, 0, &?, 0, 1749 CTL_NET, PF_INET6, IPPROTO_IPV6, 1750 IPV6CTL_FORWSRCRT, CTL_EOL); 1751 sysctl_createv(clog, 0, NULL, NULL, 1752 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1753 CTLTYPE_STRUCT, "mrtstats", NULL, 1754 NULL, 0, &?, sizeof(?), 1755 CTL_NET, PF_INET6, IPPROTO_IPV6, 1756 IPV6CTL_MRTSTATS, CTL_EOL); 1757 sysctl_createv(clog, 0, NULL, NULL, 1758 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1759 CTLTYPE_?, "mrtproto", NULL, 1760 NULL, 0, &?, sizeof(?), 1761 CTL_NET, PF_INET6, IPPROTO_IPV6, 1762 IPV6CTL_MRTPROTO, CTL_EOL); 1763 #endif 1764 sysctl_createv(clog, 0, NULL, NULL, 1765 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1766 CTLTYPE_INT, "maxfragpackets", 1767 SYSCTL_DESCR("Maximum number of fragments to buffer " 1768 "for reassembly"), 1769 NULL, 0, &ip6_maxfragpackets, 0, 1770 CTL_NET, PF_INET6, IPPROTO_IPV6, 1771 IPV6CTL_MAXFRAGPACKETS, CTL_EOL); 1772 #ifdef __no_idea__ 1773 sysctl_createv(clog, 0, NULL, NULL, 1774 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1775 CTLTYPE_INT, "sourcecheck", NULL, 1776 NULL, 0, &?, 0, 1777 CTL_NET, PF_INET6, IPPROTO_IPV6, 1778 IPV6CTL_SOURCECHECK, CTL_EOL); 1779 sysctl_createv(clog, 0, NULL, NULL, 1780 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1781 CTLTYPE_INT, "sourcecheck_logint", NULL, 1782 NULL, 0, &?, 0, 1783 CTL_NET, PF_INET6, IPPROTO_IPV6, 1784 IPV6CTL_SOURCECHECK_LOGINT, CTL_EOL); 1785 #endif 1786 sysctl_createv(clog, 0, NULL, NULL, 1787 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1788 CTLTYPE_INT, "accept_rtadv", 1789 SYSCTL_DESCR("Accept router advertisements"), 1790 NULL, 0, &ip6_accept_rtadv, 0, 1791 CTL_NET, PF_INET6, IPPROTO_IPV6, 1792 IPV6CTL_ACCEPT_RTADV, CTL_EOL); 1793 sysctl_createv(clog, 0, NULL, NULL, 1794 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1795 CTLTYPE_INT, "keepfaith", 1796 SYSCTL_DESCR("Activate faith interface"), 1797 NULL, 0, &ip6_keepfaith, 0, 1798 CTL_NET, PF_INET6, IPPROTO_IPV6, 1799 IPV6CTL_KEEPFAITH, CTL_EOL); 1800 sysctl_createv(clog, 0, NULL, NULL, 1801 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1802 CTLTYPE_INT, "log_interval", 1803 SYSCTL_DESCR("Minumum interval between logging " 1804 "unroutable packets"), 1805 NULL, 0, &ip6_log_interval, 0, 1806 CTL_NET, PF_INET6, IPPROTO_IPV6, 1807 IPV6CTL_LOG_INTERVAL, CTL_EOL); 1808 sysctl_createv(clog, 0, NULL, NULL, 1809 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1810 CTLTYPE_INT, "hdrnestlimit", 1811 SYSCTL_DESCR("Maximum number of nested IPv6 headers"), 1812 NULL, 0, &ip6_hdrnestlimit, 0, 1813 CTL_NET, PF_INET6, IPPROTO_IPV6, 1814 IPV6CTL_HDRNESTLIMIT, CTL_EOL); 1815 sysctl_createv(clog, 0, NULL, NULL, 1816 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1817 CTLTYPE_INT, "dad_count", 1818 SYSCTL_DESCR("Number of Duplicate Address Detection " 1819 "probes to send"), 1820 NULL, 0, &ip6_dad_count, 0, 1821 CTL_NET, PF_INET6, IPPROTO_IPV6, 1822 IPV6CTL_DAD_COUNT, CTL_EOL); 1823 sysctl_createv(clog, 0, NULL, NULL, 1824 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1825 CTLTYPE_INT, "auto_flowlabel", 1826 SYSCTL_DESCR("Assign random IPv6 flow labels"), 1827 NULL, 0, &ip6_auto_flowlabel, 0, 1828 CTL_NET, PF_INET6, IPPROTO_IPV6, 1829 IPV6CTL_AUTO_FLOWLABEL, CTL_EOL); 1830 sysctl_createv(clog, 0, NULL, NULL, 1831 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1832 CTLTYPE_INT, "defmcasthlim", 1833 SYSCTL_DESCR("Default multicast hop limit"), 1834 NULL, 0, &ip6_defmcasthlim, 0, 1835 CTL_NET, PF_INET6, IPPROTO_IPV6, 1836 IPV6CTL_DEFMCASTHLIM, CTL_EOL); 1837 #if NGIF > 0 1838 sysctl_createv(clog, 0, NULL, NULL, 1839 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1840 CTLTYPE_INT, "gifhlim", 1841 SYSCTL_DESCR("Default hop limit for a gif tunnel datagram"), 1842 NULL, 0, &ip6_gif_hlim, 0, 1843 CTL_NET, PF_INET6, IPPROTO_IPV6, 1844 IPV6CTL_GIF_HLIM, CTL_EOL); 1845 #endif /* NGIF */ 1846 sysctl_createv(clog, 0, NULL, NULL, 1847 CTLFLAG_PERMANENT, 1848 CTLTYPE_STRING, "kame_version", 1849 SYSCTL_DESCR("KAME Version"), 1850 NULL, 0, __UNCONST(__KAME_VERSION), 0, 1851 CTL_NET, PF_INET6, IPPROTO_IPV6, 1852 IPV6CTL_KAME_VERSION, CTL_EOL); 1853 sysctl_createv(clog, 0, NULL, NULL, 1854 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1855 CTLTYPE_INT, "use_deprecated", 1856 SYSCTL_DESCR("Allow use of deprecated addresses as " 1857 "source addresses"), 1858 NULL, 0, &ip6_use_deprecated, 0, 1859 CTL_NET, PF_INET6, IPPROTO_IPV6, 1860 IPV6CTL_USE_DEPRECATED, CTL_EOL); 1861 sysctl_createv(clog, 0, NULL, NULL, 1862 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1863 CTLTYPE_INT, "rr_prune", NULL, 1864 NULL, 0, &ip6_rr_prune, 0, 1865 CTL_NET, PF_INET6, IPPROTO_IPV6, 1866 IPV6CTL_RR_PRUNE, CTL_EOL); 1867 sysctl_createv(clog, 0, NULL, NULL, 1868 CTLFLAG_PERMANENT 1869 #ifndef INET6_BINDV6ONLY 1870 |CTLFLAG_READWRITE, 1871 #endif 1872 CTLTYPE_INT, "v6only", 1873 SYSCTL_DESCR("Disallow PF_INET6 sockets from connecting " 1874 "to PF_INET sockets"), 1875 NULL, 0, &ip6_v6only, 0, 1876 CTL_NET, PF_INET6, IPPROTO_IPV6, 1877 IPV6CTL_V6ONLY, CTL_EOL); 1878 sysctl_createv(clog, 0, NULL, NULL, 1879 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1880 CTLTYPE_INT, "anonportmin", 1881 SYSCTL_DESCR("Lowest ephemeral port number to assign"), 1882 sysctl_net_inet_ip_ports, 0, &ip6_anonportmin, 0, 1883 CTL_NET, PF_INET6, IPPROTO_IPV6, 1884 IPV6CTL_ANONPORTMIN, CTL_EOL); 1885 sysctl_createv(clog, 0, NULL, NULL, 1886 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1887 CTLTYPE_INT, "anonportmax", 1888 SYSCTL_DESCR("Highest ephemeral port number to assign"), 1889 sysctl_net_inet_ip_ports, 0, &ip6_anonportmax, 0, 1890 CTL_NET, PF_INET6, IPPROTO_IPV6, 1891 IPV6CTL_ANONPORTMAX, CTL_EOL); 1892 #ifndef IPNOPRIVPORTS 1893 sysctl_createv(clog, 0, NULL, NULL, 1894 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1895 CTLTYPE_INT, "lowportmin", 1896 SYSCTL_DESCR("Lowest privileged ephemeral port number " 1897 "to assign"), 1898 sysctl_net_inet_ip_ports, 0, &ip6_lowportmin, 0, 1899 CTL_NET, PF_INET6, IPPROTO_IPV6, 1900 IPV6CTL_LOWPORTMIN, CTL_EOL); 1901 sysctl_createv(clog, 0, NULL, NULL, 1902 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1903 CTLTYPE_INT, "lowportmax", 1904 SYSCTL_DESCR("Highest privileged ephemeral port number " 1905 "to assign"), 1906 sysctl_net_inet_ip_ports, 0, &ip6_lowportmax, 0, 1907 CTL_NET, PF_INET6, IPPROTO_IPV6, 1908 IPV6CTL_LOWPORTMAX, CTL_EOL); 1909 #endif /* IPNOPRIVPORTS */ 1910 sysctl_createv(clog, 0, NULL, NULL, 1911 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1912 CTLTYPE_INT, "use_tempaddr", 1913 SYSCTL_DESCR("Use temporary address"), 1914 NULL, 0, &ip6_use_tempaddr, 0, 1915 CTL_NET, PF_INET6, IPPROTO_IPV6, 1916 CTL_CREATE, CTL_EOL); 1917 sysctl_createv(clog, 0, NULL, NULL, 1918 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1919 CTLTYPE_INT, "temppltime", 1920 SYSCTL_DESCR("preferred lifetime of a temporary address"), 1921 NULL, 0, &ip6_temp_preferred_lifetime, 0, 1922 CTL_NET, PF_INET6, IPPROTO_IPV6, 1923 CTL_CREATE, CTL_EOL); 1924 sysctl_createv(clog, 0, NULL, NULL, 1925 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1926 CTLTYPE_INT, "tempvltime", 1927 SYSCTL_DESCR("valid lifetime of a temporary address"), 1928 NULL, 0, &ip6_temp_valid_lifetime, 0, 1929 CTL_NET, PF_INET6, IPPROTO_IPV6, 1930 CTL_CREATE, CTL_EOL); 1931 sysctl_createv(clog, 0, NULL, NULL, 1932 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1933 CTLTYPE_INT, "maxfrags", 1934 SYSCTL_DESCR("Maximum fragments in reassembly queue"), 1935 NULL, 0, &ip6_maxfrags, 0, 1936 CTL_NET, PF_INET6, IPPROTO_IPV6, 1937 IPV6CTL_MAXFRAGS, CTL_EOL); 1938 sysctl_createv(clog, 0, NULL, NULL, 1939 CTLFLAG_PERMANENT, 1940 CTLTYPE_STRUCT, "stats", 1941 SYSCTL_DESCR("IPv6 statistics"), 1942 sysctl_net_inet6_ip6_stats, 0, NULL, 0, 1943 CTL_NET, PF_INET6, IPPROTO_IPV6, 1944 IPV6CTL_STATS, CTL_EOL); 1945 sysctl_createv(clog, 0, NULL, NULL, 1946 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1947 CTLTYPE_INT, "use_defaultzone", 1948 SYSCTL_DESCR("Whether to use the default scope zones"), 1949 NULL, 0, &ip6_use_defzone, 0, 1950 CTL_NET, PF_INET6, IPPROTO_IPV6, 1951 IPV6CTL_USE_DEFAULTZONE, CTL_EOL); 1952 sysctl_createv(clog, 0, NULL, NULL, 1953 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1954 CTLTYPE_INT, "mcast_pmtu", 1955 SYSCTL_DESCR("Enable pMTU discovery for multicast packet"), 1956 NULL, 0, &ip6_mcast_pmtu, 0, 1957 CTL_NET, PF_INET6, IPPROTO_IPV6, 1958 CTL_CREATE, CTL_EOL); 1959 #ifdef GATEWAY 1960 sysctl_createv(clog, 0, NULL, NULL, 1961 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1962 CTLTYPE_INT, "maxflows", 1963 SYSCTL_DESCR("Number of flows for fast forwarding (IPv6)"), 1964 sysctl_net_inet6_ip6_maxflows, 0, &ip6_maxflows, 0, 1965 CTL_NET, PF_INET6, IPPROTO_IPV6, 1966 CTL_CREATE, CTL_EOL); 1967 sysctl_createv(clog, 0, NULL, NULL, 1968 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1969 CTLTYPE_INT, "hashsize", 1970 SYSCTL_DESCR("Size of hash table for fast forwarding (IPv6)"), 1971 sysctl_net_inet6_ip6_hashsize, 0, &ip6_hashsize, 0, 1972 CTL_NET, PF_INET6, IPPROTO_IPV6, 1973 CTL_CREATE, CTL_EOL); 1974 #endif 1975 } 1976 1977 void 1978 ip6_statinc(u_int stat) 1979 { 1980 1981 KASSERT(stat < IP6_NSTATS); 1982 IP6_STATINC(stat); 1983 } 1984