ip6_input.c revision 1.126
1 /* $NetBSD: ip6_input.c,v 1.126 2009/04/18 14:58:05 tsutsui 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 1.126 2009/04/18 14:58:05 tsutsui 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); 164 165 /* 166 * IP6 initialization: fill in IP6 protocol switch table. 167 * All protocols not implemented in kernel go to raw IP6 protocol handler. 168 */ 169 void 170 ip6_init(void) 171 { 172 const struct ip6protosw *pr; 173 int i; 174 175 pr = (const struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 176 if (pr == 0) 177 panic("ip6_init"); 178 for (i = 0; i < IPPROTO_MAX; i++) 179 ip6_protox[i] = pr - inet6sw; 180 for (pr = (const struct ip6protosw *)inet6domain.dom_protosw; 181 pr < (const struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++) 182 if (pr->pr_domain->dom_family == PF_INET6 && 183 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) 184 ip6_protox[pr->pr_protocol] = pr - inet6sw; 185 ip6intrq.ifq_maxlen = ip6qmaxlen; 186 scope6_init(); 187 addrsel_policy_init(); 188 nd6_init(); 189 frag6_init(); 190 ip6_desync_factor = arc4random() % MAX_TEMP_DESYNC_FACTOR; 191 192 ip6_init2((void *)0); 193 #ifdef GATEWAY 194 ip6flow_init(ip6_hashsize); 195 #endif 196 197 #ifdef PFIL_HOOKS 198 /* Register our Packet Filter hook. */ 199 inet6_pfil_hook.ph_type = PFIL_TYPE_AF; 200 inet6_pfil_hook.ph_af = AF_INET6; 201 i = pfil_head_register(&inet6_pfil_hook); 202 if (i != 0) 203 printf("ip6_init: WARNING: unable to register pfil hook, " 204 "error %d\n", i); 205 #endif /* PFIL_HOOKS */ 206 207 ip6stat_percpu = percpu_alloc(sizeof(uint64_t) * IP6_NSTATS); 208 } 209 210 static void 211 ip6_init2(void *dummy) 212 { 213 214 /* nd6_timer_init */ 215 callout_init(&nd6_timer_ch, CALLOUT_MPSAFE); 216 callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL); 217 218 /* timer for regeneranation of temporary addresses randomize ID */ 219 callout_init(&in6_tmpaddrtimer_ch, CALLOUT_MPSAFE); 220 callout_reset(&in6_tmpaddrtimer_ch, 221 (ip6_temp_preferred_lifetime - ip6_desync_factor - 222 ip6_temp_regen_advance) * hz, 223 in6_tmpaddrtimer, NULL); 224 } 225 226 /* 227 * IP6 input interrupt handling. Just pass the packet to ip6_input. 228 */ 229 void 230 ip6intr(void) 231 { 232 int s; 233 struct mbuf *m; 234 235 mutex_enter(softnet_lock); 236 KERNEL_LOCK(1, NULL); 237 for (;;) { 238 s = splnet(); 239 IF_DEQUEUE(&ip6intrq, m); 240 splx(s); 241 if (m == 0) 242 break; 243 /* drop the packet if IPv6 operation is disabled on the IF */ 244 if ((ND_IFINFO(m->m_pkthdr.rcvif)->flags & ND6_IFF_IFDISABLED)) { 245 m_freem(m); 246 break; 247 } 248 ip6_input(m); 249 } 250 KERNEL_UNLOCK_ONE(NULL); 251 mutex_exit(softnet_lock); 252 } 253 254 extern struct route ip6_forward_rt; 255 256 void 257 ip6_input(struct mbuf *m) 258 { 259 struct ip6_hdr *ip6; 260 int hit, off = sizeof(struct ip6_hdr), nest; 261 u_int32_t plen; 262 u_int32_t rtalert = ~0; 263 int nxt, ours = 0, rh_present = 0; 264 struct ifnet *deliverifp = NULL; 265 int srcrt = 0; 266 const struct rtentry *rt; 267 union { 268 struct sockaddr dst; 269 struct sockaddr_in6 dst6; 270 } u; 271 #ifdef FAST_IPSEC 272 struct m_tag *mtag; 273 struct tdb_ident *tdbi; 274 struct secpolicy *sp; 275 int s, error; 276 #endif 277 278 #ifdef IPSEC 279 /* 280 * should the inner packet be considered authentic? 281 * see comment in ah4_input(). 282 */ 283 m->m_flags &= ~M_AUTHIPHDR; 284 m->m_flags &= ~M_AUTHIPDGM; 285 #endif 286 287 /* 288 * make sure we don't have onion peering information into m_tag. 289 */ 290 ip6_delaux(m); 291 292 /* 293 * mbuf statistics 294 */ 295 if (m->m_flags & M_EXT) { 296 if (m->m_next) 297 IP6_STATINC(IP6_STAT_MEXT2M); 298 else 299 IP6_STATINC(IP6_STAT_MEXT1); 300 } else { 301 #define M2MMAX 32 302 if (m->m_next) { 303 if (m->m_flags & M_LOOP) { 304 /*XXX*/ IP6_STATINC(IP6_STAT_M2M + lo0ifp->if_index); 305 } else if (m->m_pkthdr.rcvif->if_index < M2MMAX) { 306 IP6_STATINC(IP6_STAT_M2M + 307 m->m_pkthdr.rcvif->if_index); 308 } else 309 IP6_STATINC(IP6_STAT_M2M); 310 } else 311 IP6_STATINC(IP6_STAT_M1); 312 #undef M2MMAX 313 } 314 315 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive); 316 IP6_STATINC(IP6_STAT_TOTAL); 317 318 /* 319 * If the IPv6 header is not aligned, slurp it up into a new 320 * mbuf with space for link headers, in the event we forward 321 * it. Otherwise, if it is aligned, make sure the entire base 322 * IPv6 header is in the first mbuf of the chain. 323 */ 324 if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 325 struct ifnet *inifp = m->m_pkthdr.rcvif; 326 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 327 (max_linkhdr + 3) & ~3)) == NULL) { 328 /* XXXJRT new stat, please */ 329 IP6_STATINC(IP6_STAT_TOOSMALL); 330 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 331 return; 332 } 333 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 334 struct ifnet *inifp = m->m_pkthdr.rcvif; 335 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 336 IP6_STATINC(IP6_STAT_TOOSMALL); 337 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 338 return; 339 } 340 } 341 342 ip6 = mtod(m, struct ip6_hdr *); 343 344 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 345 IP6_STATINC(IP6_STAT_BADVERS); 346 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 347 goto bad; 348 } 349 350 #if defined(IPSEC) 351 /* IPv6 fast forwarding is not compatible with IPsec. */ 352 m->m_flags &= ~M_CANFASTFWD; 353 #else 354 /* 355 * Assume that we can create a fast-forward IP flow entry 356 * based on this packet. 357 */ 358 m->m_flags |= M_CANFASTFWD; 359 #endif 360 361 #ifdef PFIL_HOOKS 362 /* 363 * Run through list of hooks for input packets. If there are any 364 * filters which require that additional packets in the flow are 365 * not fast-forwarded, they must clear the M_CANFASTFWD flag. 366 * Note that filters must _never_ set this flag, as another filter 367 * in the list may have previously cleared it. 368 */ 369 /* 370 * let ipfilter look at packet on the wire, 371 * not the decapsulated packet. 372 */ 373 #ifdef IPSEC 374 if (!ipsec_getnhist(m)) 375 #elif defined(FAST_IPSEC) 376 if (!ipsec_indone(m)) 377 #else 378 if (1) 379 #endif 380 { 381 struct in6_addr odst; 382 383 odst = ip6->ip6_dst; 384 if (pfil_run_hooks(&inet6_pfil_hook, &m, m->m_pkthdr.rcvif, 385 PFIL_IN) != 0) 386 return; 387 if (m == NULL) 388 return; 389 ip6 = mtod(m, struct ip6_hdr *); 390 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst); 391 } 392 #endif /* PFIL_HOOKS */ 393 394 IP6_STATINC(IP6_STAT_NXTHIST + ip6->ip6_nxt); 395 396 #ifdef ALTQ 397 if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) { 398 /* packet is dropped by traffic conditioner */ 399 return; 400 } 401 #endif 402 403 /* 404 * Check against address spoofing/corruption. 405 */ 406 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) || 407 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) { 408 /* 409 * XXX: "badscope" is not very suitable for a multicast source. 410 */ 411 IP6_STATINC(IP6_STAT_BADSCOPE); 412 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 413 goto bad; 414 } 415 /* 416 * The following check is not documented in specs. A malicious 417 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack 418 * and bypass security checks (act as if it was from 127.0.0.1 by using 419 * IPv6 src ::ffff:127.0.0.1). Be cautious. 420 * 421 * This check chokes if we are in an SIIT cloud. As none of BSDs 422 * support IPv4-less kernel compilation, we cannot support SIIT 423 * environment at all. So, it makes more sense for us to reject any 424 * malicious packets for non-SIIT environment, than try to do a 425 * partial support for SIIT environment. 426 */ 427 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 428 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 429 IP6_STATINC(IP6_STAT_BADSCOPE); 430 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 431 goto bad; 432 } 433 #if 0 434 /* 435 * Reject packets with IPv4 compatible addresses (auto tunnel). 436 * 437 * The code forbids auto tunnel relay case in RFC1933 (the check is 438 * stronger than RFC1933). We may want to re-enable it if mech-xx 439 * is revised to forbid relaying case. 440 */ 441 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) || 442 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) { 443 IP6_STATINC(IP6_STAT_BADSCOPE); 444 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 445 goto bad; 446 } 447 #endif 448 449 /* 450 * Disambiguate address scope zones (if there is ambiguity). 451 * We first make sure that the original source or destination address 452 * is not in our internal form for scoped addresses. Such addresses 453 * are not necessarily invalid spec-wise, but we cannot accept them due 454 * to the usage conflict. 455 * in6_setscope() then also checks and rejects the cases where src or 456 * dst are the loopback address and the receiving interface 457 * is not loopback. 458 */ 459 if (__predict_false( 460 m_makewritable(&m, 0, sizeof(struct ip6_hdr), M_DONTWAIT))) 461 goto bad; 462 ip6 = mtod(m, struct ip6_hdr *); 463 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) { 464 IP6_STATINC(IP6_STAT_BADSCOPE); /* XXX */ 465 goto bad; 466 } 467 if (in6_setscope(&ip6->ip6_src, m->m_pkthdr.rcvif, NULL) || 468 in6_setscope(&ip6->ip6_dst, m->m_pkthdr.rcvif, NULL)) { 469 IP6_STATINC(IP6_STAT_BADSCOPE); 470 goto bad; 471 } 472 473 /* 474 * Multicast check 475 */ 476 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 477 struct in6_multi *in6m = 0; 478 479 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast); 480 /* 481 * See if we belong to the destination multicast group on the 482 * arrival interface. 483 */ 484 IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m); 485 if (in6m) 486 ours = 1; 487 else if (!ip6_mrouter) { 488 uint64_t *ip6s = IP6_STAT_GETREF(); 489 ip6s[IP6_STAT_NOTMEMBER]++; 490 ip6s[IP6_STAT_CANTFORWARD]++; 491 IP6_STAT_PUTREF(); 492 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 493 goto bad; 494 } 495 deliverifp = m->m_pkthdr.rcvif; 496 goto hbhcheck; 497 } 498 499 sockaddr_in6_init(&u.dst6, &ip6->ip6_dst, 0, 0, 0); 500 501 /* 502 * Unicast check 503 */ 504 rt = rtcache_lookup2(&ip6_forward_rt, &u.dst, 1, &hit); 505 if (hit) 506 IP6_STATINC(IP6_STAT_FORWARD_CACHEHIT); 507 else 508 IP6_STATINC(IP6_STAT_FORWARD_CACHEMISS); 509 510 #define rt6_getkey(__rt) satocsin6(rt_getkey(__rt)) 511 512 /* 513 * Accept the packet if the forwarding interface to the destination 514 * according to the routing table is the loopback interface, 515 * unless the associated route has a gateway. 516 * Note that this approach causes to accept a packet if there is a 517 * route to the loopback interface for the destination of the packet. 518 * But we think it's even useful in some situations, e.g. when using 519 * a special daemon which wants to intercept the packet. 520 */ 521 if (rt != NULL && 522 (rt->rt_flags & (RTF_HOST|RTF_GATEWAY)) == RTF_HOST && 523 !(rt->rt_flags & RTF_CLONED) && 524 #if 0 525 /* 526 * The check below is redundant since the comparison of 527 * the destination and the key of the rtentry has 528 * already done through looking up the routing table. 529 */ 530 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &rt6_getkey(rt)->sin6_addr) && 531 #endif 532 rt->rt_ifp->if_type == IFT_LOOP) { 533 struct in6_ifaddr *ia6 = (struct in6_ifaddr *)rt->rt_ifa; 534 if (ia6->ia6_flags & IN6_IFF_ANYCAST) 535 m->m_flags |= M_ANYCAST6; 536 /* 537 * packets to a tentative, duplicated, or somehow invalid 538 * address must not be accepted. 539 */ 540 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) { 541 /* this address is ready */ 542 ours = 1; 543 deliverifp = ia6->ia_ifp; /* correct? */ 544 goto hbhcheck; 545 } else { 546 /* address is not ready, so discard the packet. */ 547 nd6log((LOG_INFO, 548 "ip6_input: packet to an unready address %s->%s\n", 549 ip6_sprintf(&ip6->ip6_src), 550 ip6_sprintf(&ip6->ip6_dst))); 551 552 goto bad; 553 } 554 } 555 556 /* 557 * FAITH (Firewall Aided Internet Translator) 558 */ 559 #if defined(NFAITH) && 0 < NFAITH 560 if (ip6_keepfaith) { 561 if (rt != NULL && rt->rt_ifp != NULL && 562 rt->rt_ifp->if_type == IFT_FAITH) { 563 /* XXX do we need more sanity checks? */ 564 ours = 1; 565 deliverifp = rt->rt_ifp; /* faith */ 566 goto hbhcheck; 567 } 568 } 569 #endif 570 571 #if 0 572 { 573 /* 574 * Last resort: check in6_ifaddr for incoming interface. 575 * The code is here until I update the "goto ours hack" code above 576 * working right. 577 */ 578 struct ifaddr *ifa; 579 IFADDR_FOREACH(ifa, m->m_pkthdr.rcvif) { 580 if (ifa->ifa_addr == NULL) 581 continue; /* just for safety */ 582 if (ifa->ifa_addr->sa_family != AF_INET6) 583 continue; 584 if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) { 585 ours = 1; 586 deliverifp = ifa->ifa_ifp; 587 goto hbhcheck; 588 } 589 } 590 } 591 #endif 592 593 /* 594 * Now there is no reason to process the packet if it's not our own 595 * and we're not a router. 596 */ 597 if (!ip6_forwarding) { 598 IP6_STATINC(IP6_STAT_CANTFORWARD); 599 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 600 goto bad; 601 } 602 603 hbhcheck: 604 /* 605 * record address information into m_tag, if we don't have one yet. 606 * note that we are unable to record it, if the address is not listed 607 * as our interface address (e.g. multicast addresses, addresses 608 * within FAITH prefixes and such). 609 */ 610 if (deliverifp && ip6_getdstifaddr(m) == NULL) { 611 struct in6_ifaddr *ia6; 612 613 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 614 if (ia6 != NULL && ip6_setdstifaddr(m, ia6) == NULL) { 615 /* 616 * XXX maybe we should drop the packet here, 617 * as we could not provide enough information 618 * to the upper layers. 619 */ 620 } 621 } 622 623 /* 624 * Process Hop-by-Hop options header if it's contained. 625 * m may be modified in ip6_hopopts_input(). 626 * If a JumboPayload option is included, plen will also be modified. 627 */ 628 plen = (u_int32_t)ntohs(ip6->ip6_plen); 629 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 630 struct ip6_hbh *hbh; 631 632 if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) { 633 #if 0 /*touches NULL pointer*/ 634 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 635 #endif 636 return; /* m have already been freed */ 637 } 638 639 /* adjust pointer */ 640 ip6 = mtod(m, struct ip6_hdr *); 641 642 /* 643 * if the payload length field is 0 and the next header field 644 * indicates Hop-by-Hop Options header, then a Jumbo Payload 645 * option MUST be included. 646 */ 647 if (ip6->ip6_plen == 0 && plen == 0) { 648 /* 649 * Note that if a valid jumbo payload option is 650 * contained, ip6_hopopts_input() must set a valid 651 * (non-zero) payload length to the variable plen. 652 */ 653 IP6_STATINC(IP6_STAT_BADOPTIONS); 654 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 655 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 656 icmp6_error(m, ICMP6_PARAM_PROB, 657 ICMP6_PARAMPROB_HEADER, 658 (char *)&ip6->ip6_plen - (char *)ip6); 659 return; 660 } 661 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 662 sizeof(struct ip6_hbh)); 663 if (hbh == NULL) { 664 IP6_STATINC(IP6_STAT_TOOSHORT); 665 return; 666 } 667 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 668 nxt = hbh->ip6h_nxt; 669 670 /* 671 * accept the packet if a router alert option is included 672 * and we act as an IPv6 router. 673 */ 674 if (rtalert != ~0 && ip6_forwarding) 675 ours = 1; 676 } else 677 nxt = ip6->ip6_nxt; 678 679 /* 680 * Check that the amount of data in the buffers 681 * is as at least much as the IPv6 header would have us expect. 682 * Trim mbufs if longer than we expect. 683 * Drop packet if shorter than we expect. 684 */ 685 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 686 IP6_STATINC(IP6_STAT_TOOSHORT); 687 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 688 goto bad; 689 } 690 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 691 if (m->m_len == m->m_pkthdr.len) { 692 m->m_len = sizeof(struct ip6_hdr) + plen; 693 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 694 } else 695 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 696 } 697 698 /* 699 * Forward if desirable. 700 */ 701 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 702 /* 703 * If we are acting as a multicast router, all 704 * incoming multicast packets are passed to the 705 * kernel-level multicast forwarding function. 706 * The packet is returned (relatively) intact; if 707 * ip6_mforward() returns a non-zero value, the packet 708 * must be discarded, else it may be accepted below. 709 */ 710 if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) { 711 IP6_STATINC(IP6_STAT_CANTFORWARD); 712 m_freem(m); 713 return; 714 } 715 if (!ours) { 716 m_freem(m); 717 return; 718 } 719 } else if (!ours) { 720 ip6_forward(m, srcrt); 721 return; 722 } 723 724 ip6 = mtod(m, struct ip6_hdr *); 725 726 /* 727 * Malicious party may be able to use IPv4 mapped addr to confuse 728 * tcp/udp stack and bypass security checks (act as if it was from 729 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious. 730 * 731 * For SIIT end node behavior, you may want to disable the check. 732 * However, you will become vulnerable to attacks using IPv4 mapped 733 * source. 734 */ 735 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 736 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 737 IP6_STATINC(IP6_STAT_BADSCOPE); 738 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 739 goto bad; 740 } 741 742 /* 743 * Tell launch routine the next header 744 */ 745 #ifdef IFA_STATS 746 if (deliverifp != NULL) { 747 struct in6_ifaddr *ia6; 748 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 749 if (ia6) 750 ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len; 751 } 752 #endif 753 IP6_STATINC(IP6_STAT_DELIVERED); 754 in6_ifstat_inc(deliverifp, ifs6_in_deliver); 755 nest = 0; 756 757 rh_present = 0; 758 while (nxt != IPPROTO_DONE) { 759 if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) { 760 IP6_STATINC(IP6_STAT_TOOMANYHDR); 761 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 762 goto bad; 763 } 764 765 /* 766 * protection against faulty packet - there should be 767 * more sanity checks in header chain processing. 768 */ 769 if (m->m_pkthdr.len < off) { 770 IP6_STATINC(IP6_STAT_TOOSHORT); 771 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 772 goto bad; 773 } 774 775 if (nxt == IPPROTO_ROUTING) { 776 if (rh_present++) { 777 in6_ifstat_inc(m->m_pkthdr.rcvif, 778 ifs6_in_hdrerr); 779 IP6_STATINC(IP6_STAT_BADOPTIONS); 780 goto bad; 781 } 782 } 783 784 #ifdef IPSEC 785 /* 786 * enforce IPsec policy checking if we are seeing last header. 787 * note that we do not visit this with protocols with pcb layer 788 * code - like udp/tcp/raw ip. 789 */ 790 if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 && 791 ipsec6_in_reject(m, NULL)) { 792 IPSEC6_STATINC(IPSEC_STAT_IN_POLVIO); 793 goto bad; 794 } 795 #endif 796 #ifdef FAST_IPSEC 797 /* 798 * enforce IPsec policy checking if we are seeing last header. 799 * note that we do not visit this with protocols with pcb layer 800 * code - like udp/tcp/raw ip. 801 */ 802 if ((inet6sw[ip_protox[nxt]].pr_flags & PR_LASTHDR) != 0) { 803 /* 804 * Check if the packet has already had IPsec processing 805 * done. If so, then just pass it along. This tag gets 806 * set during AH, ESP, etc. input handling, before the 807 * packet is returned to the ip input queue for delivery. 808 */ 809 mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL); 810 s = splsoftnet(); 811 if (mtag != NULL) { 812 tdbi = (struct tdb_ident *)(mtag + 1); 813 sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND); 814 } else { 815 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, 816 IP_FORWARDING, &error); 817 } 818 if (sp != NULL) { 819 /* 820 * Check security policy against packet attributes. 821 */ 822 error = ipsec_in_reject(sp, m); 823 KEY_FREESP(&sp); 824 } else { 825 /* XXX error stat??? */ 826 error = EINVAL; 827 DPRINTF(("ip6_input: no SP, packet discarded\n"));/*XXX*/ 828 } 829 splx(s); 830 if (error) 831 goto bad; 832 } 833 #endif /* FAST_IPSEC */ 834 835 836 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt); 837 } 838 return; 839 bad: 840 m_freem(m); 841 } 842 843 /* 844 * set/grab in6_ifaddr correspond to IPv6 destination address. 845 */ 846 static struct m_tag * 847 ip6_setdstifaddr(struct mbuf *m, const struct in6_ifaddr *ia) 848 { 849 struct m_tag *mtag; 850 851 mtag = ip6_addaux(m); 852 if (mtag != NULL) { 853 struct ip6aux *ip6a; 854 855 ip6a = (struct ip6aux *)(mtag + 1); 856 in6_setscope(&ip6a->ip6a_src, ia->ia_ifp, &ip6a->ip6a_scope_id); 857 ip6a->ip6a_src = ia->ia_addr.sin6_addr; 858 ip6a->ip6a_flags = ia->ia6_flags; 859 } 860 return mtag; /* NULL if failed to set */ 861 } 862 863 const struct ip6aux * 864 ip6_getdstifaddr(struct mbuf *m) 865 { 866 struct m_tag *mtag; 867 868 mtag = ip6_findaux(m); 869 if (mtag != NULL) 870 return (struct ip6aux *)(mtag + 1); 871 else 872 return NULL; 873 } 874 875 /* 876 * Hop-by-Hop options header processing. If a valid jumbo payload option is 877 * included, the real payload length will be stored in plenp. 878 * 879 * rtalertp - XXX: should be stored more smart way 880 */ 881 static int 882 ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp, 883 struct mbuf **mp, int *offp) 884 { 885 struct mbuf *m = *mp; 886 int off = *offp, hbhlen; 887 struct ip6_hbh *hbh; 888 889 /* validation of the length of the header */ 890 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, 891 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh)); 892 if (hbh == NULL) { 893 IP6_STATINC(IP6_STAT_TOOSHORT); 894 return -1; 895 } 896 hbhlen = (hbh->ip6h_len + 1) << 3; 897 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 898 hbhlen); 899 if (hbh == NULL) { 900 IP6_STATINC(IP6_STAT_TOOSHORT); 901 return -1; 902 } 903 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 904 off += hbhlen; 905 hbhlen -= sizeof(struct ip6_hbh); 906 907 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 908 hbhlen, rtalertp, plenp) < 0) 909 return (-1); 910 911 *offp = off; 912 *mp = m; 913 return (0); 914 } 915 916 /* 917 * Search header for all Hop-by-hop options and process each option. 918 * This function is separate from ip6_hopopts_input() in order to 919 * handle a case where the sending node itself process its hop-by-hop 920 * options header. In such a case, the function is called from ip6_output(). 921 * 922 * The function assumes that hbh header is located right after the IPv6 header 923 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to 924 * opthead + hbhlen is located in continuous memory region. 925 */ 926 int 927 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen, 928 u_int32_t *rtalertp, u_int32_t *plenp) 929 { 930 struct ip6_hdr *ip6; 931 int optlen = 0; 932 u_int8_t *opt = opthead; 933 u_int16_t rtalert_val; 934 u_int32_t jumboplen; 935 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh); 936 937 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 938 switch (*opt) { 939 case IP6OPT_PAD1: 940 optlen = 1; 941 break; 942 case IP6OPT_PADN: 943 if (hbhlen < IP6OPT_MINLEN) { 944 IP6_STATINC(IP6_STAT_TOOSMALL); 945 goto bad; 946 } 947 optlen = *(opt + 1) + 2; 948 break; 949 case IP6OPT_RTALERT: 950 /* XXX may need check for alignment */ 951 if (hbhlen < IP6OPT_RTALERT_LEN) { 952 IP6_STATINC(IP6_STAT_TOOSMALL); 953 goto bad; 954 } 955 if (*(opt + 1) != IP6OPT_RTALERT_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_RTALERT_LEN; 963 memcpy((void *)&rtalert_val, (void *)(opt + 2), 2); 964 *rtalertp = ntohs(rtalert_val); 965 break; 966 case IP6OPT_JUMBO: 967 /* XXX may need check for alignment */ 968 if (hbhlen < IP6OPT_JUMBO_LEN) { 969 IP6_STATINC(IP6_STAT_TOOSMALL); 970 goto bad; 971 } 972 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) { 973 /* XXX stat */ 974 icmp6_error(m, ICMP6_PARAM_PROB, 975 ICMP6_PARAMPROB_HEADER, 976 erroff + opt + 1 - opthead); 977 return (-1); 978 } 979 optlen = IP6OPT_JUMBO_LEN; 980 981 /* 982 * IPv6 packets that have non 0 payload length 983 * must not contain a jumbo payload option. 984 */ 985 ip6 = mtod(m, struct ip6_hdr *); 986 if (ip6->ip6_plen) { 987 IP6_STATINC(IP6_STAT_BADOPTIONS); 988 icmp6_error(m, ICMP6_PARAM_PROB, 989 ICMP6_PARAMPROB_HEADER, 990 erroff + opt - opthead); 991 return (-1); 992 } 993 994 /* 995 * We may see jumbolen in unaligned location, so 996 * we'd need to perform bcopy(). 997 */ 998 memcpy(&jumboplen, opt + 2, sizeof(jumboplen)); 999 jumboplen = (u_int32_t)htonl(jumboplen); 1000 1001 #if 1 1002 /* 1003 * if there are multiple jumbo payload options, 1004 * *plenp will be non-zero and the packet will be 1005 * rejected. 1006 * the behavior may need some debate in ipngwg - 1007 * multiple options does not make sense, however, 1008 * there's no explicit mention in specification. 1009 */ 1010 if (*plenp != 0) { 1011 IP6_STATINC(IP6_STAT_BADOPTIONS); 1012 icmp6_error(m, ICMP6_PARAM_PROB, 1013 ICMP6_PARAMPROB_HEADER, 1014 erroff + opt + 2 - opthead); 1015 return (-1); 1016 } 1017 #endif 1018 1019 /* 1020 * jumbo payload length must be larger than 65535. 1021 */ 1022 if (jumboplen <= IPV6_MAXPACKET) { 1023 IP6_STATINC(IP6_STAT_BADOPTIONS); 1024 icmp6_error(m, ICMP6_PARAM_PROB, 1025 ICMP6_PARAMPROB_HEADER, 1026 erroff + opt + 2 - opthead); 1027 return (-1); 1028 } 1029 *plenp = jumboplen; 1030 1031 break; 1032 default: /* unknown option */ 1033 if (hbhlen < IP6OPT_MINLEN) { 1034 IP6_STATINC(IP6_STAT_TOOSMALL); 1035 goto bad; 1036 } 1037 optlen = ip6_unknown_opt(opt, m, 1038 erroff + opt - opthead); 1039 if (optlen == -1) 1040 return (-1); 1041 optlen += 2; 1042 break; 1043 } 1044 } 1045 1046 return (0); 1047 1048 bad: 1049 m_freem(m); 1050 return (-1); 1051 } 1052 1053 /* 1054 * Unknown option processing. 1055 * The third argument `off' is the offset from the IPv6 header to the option, 1056 * which is necessary if the IPv6 header the and option header and IPv6 header 1057 * is not continuous in order to return an ICMPv6 error. 1058 */ 1059 int 1060 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off) 1061 { 1062 struct ip6_hdr *ip6; 1063 1064 switch (IP6OPT_TYPE(*optp)) { 1065 case IP6OPT_TYPE_SKIP: /* ignore the option */ 1066 return ((int)*(optp + 1)); 1067 case IP6OPT_TYPE_DISCARD: /* silently discard */ 1068 m_freem(m); 1069 return (-1); 1070 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 1071 IP6_STATINC(IP6_STAT_BADOPTIONS); 1072 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 1073 return (-1); 1074 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 1075 IP6_STATINC(IP6_STAT_BADOPTIONS); 1076 ip6 = mtod(m, struct ip6_hdr *); 1077 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 1078 (m->m_flags & (M_BCAST|M_MCAST))) 1079 m_freem(m); 1080 else 1081 icmp6_error(m, ICMP6_PARAM_PROB, 1082 ICMP6_PARAMPROB_OPTION, off); 1083 return (-1); 1084 } 1085 1086 m_freem(m); /* XXX: NOTREACHED */ 1087 return (-1); 1088 } 1089 1090 /* 1091 * Create the "control" list for this pcb. 1092 * 1093 * The routine will be called from upper layer handlers like tcp6_input(). 1094 * Thus the routine assumes that the caller (tcp6_input) have already 1095 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the 1096 * very first mbuf on the mbuf chain. 1097 * We may want to add some infinite loop prevention or sanity checks for safety. 1098 * (This applies only when you are using KAME mbuf chain restriction, i.e. 1099 * you are using IP6_EXTHDR_CHECK() not m_pulldown()) 1100 */ 1101 void 1102 ip6_savecontrol(struct in6pcb *in6p, struct mbuf **mp, 1103 struct ip6_hdr *ip6, struct mbuf *m) 1104 { 1105 #ifdef RFC2292 1106 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y)) 1107 #else 1108 #define IS2292(x, y) (y) 1109 #endif 1110 1111 if (in6p->in6p_socket->so_options & SO_TIMESTAMP 1112 #ifdef SO_OTIMESTAMP 1113 || in6p->in6p_socket->so_options & SO_OTIMESTAMP 1114 #endif 1115 ) { 1116 struct timeval tv; 1117 1118 microtime(&tv); 1119 #ifdef SO_OTIMESTAMP 1120 if (in6p->in6p_socket->so_options & SO_OTIMESTAMP) { 1121 struct timeval50 tv50; 1122 timeval_to_timeval50(&tv, &tv50); 1123 *mp = sbcreatecontrol((void *) &tv50, sizeof(tv50), 1124 SCM_OTIMESTAMP, SOL_SOCKET); 1125 } else 1126 #endif 1127 *mp = sbcreatecontrol((void *) &tv, sizeof(tv), 1128 SCM_TIMESTAMP, SOL_SOCKET); 1129 if (*mp) 1130 mp = &(*mp)->m_next; 1131 } 1132 1133 /* some OSes call this logic with IPv4 packet, for SO_TIMESTAMP */ 1134 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) 1135 return; 1136 1137 /* RFC 2292 sec. 5 */ 1138 if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) { 1139 struct in6_pktinfo pi6; 1140 1141 memcpy(&pi6.ipi6_addr, &ip6->ip6_dst, sizeof(struct in6_addr)); 1142 in6_clearscope(&pi6.ipi6_addr); /* XXX */ 1143 pi6.ipi6_ifindex = m->m_pkthdr.rcvif ? 1144 m->m_pkthdr.rcvif->if_index : 0; 1145 *mp = sbcreatecontrol((void *) &pi6, 1146 sizeof(struct in6_pktinfo), 1147 IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6); 1148 if (*mp) 1149 mp = &(*mp)->m_next; 1150 } 1151 1152 if (in6p->in6p_flags & IN6P_HOPLIMIT) { 1153 int hlim = ip6->ip6_hlim & 0xff; 1154 1155 *mp = sbcreatecontrol((void *) &hlim, sizeof(int), 1156 IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6); 1157 if (*mp) 1158 mp = &(*mp)->m_next; 1159 } 1160 1161 if ((in6p->in6p_flags & IN6P_TCLASS) != 0) { 1162 u_int32_t flowinfo; 1163 int tclass; 1164 1165 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK); 1166 flowinfo >>= 20; 1167 1168 tclass = flowinfo & 0xff; 1169 *mp = sbcreatecontrol((void *)&tclass, sizeof(tclass), 1170 IPV6_TCLASS, IPPROTO_IPV6); 1171 1172 if (*mp) 1173 mp = &(*mp)->m_next; 1174 } 1175 1176 /* 1177 * IPV6_HOPOPTS socket option. Recall that we required super-user 1178 * privilege for the option (see ip6_ctloutput), but it might be too 1179 * strict, since there might be some hop-by-hop options which can be 1180 * returned to normal user. 1181 * See also RFC3542 section 8 (or RFC2292 section 6). 1182 */ 1183 if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0) { 1184 /* 1185 * Check if a hop-by-hop options header is contatined in the 1186 * received packet, and if so, store the options as ancillary 1187 * data. Note that a hop-by-hop options header must be 1188 * just after the IPv6 header, which fact is assured through 1189 * the IPv6 input processing. 1190 */ 1191 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1192 if (xip6->ip6_nxt == IPPROTO_HOPOPTS) { 1193 struct ip6_hbh *hbh; 1194 int hbhlen; 1195 struct mbuf *ext; 1196 1197 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr), 1198 xip6->ip6_nxt); 1199 if (ext == NULL) { 1200 IP6_STATINC(IP6_STAT_TOOSHORT); 1201 return; 1202 } 1203 hbh = mtod(ext, struct ip6_hbh *); 1204 hbhlen = (hbh->ip6h_len + 1) << 3; 1205 if (hbhlen != ext->m_len) { 1206 m_freem(ext); 1207 IP6_STATINC(IP6_STAT_TOOSHORT); 1208 return; 1209 } 1210 1211 /* 1212 * XXX: We copy whole the header even if a jumbo 1213 * payload option is included, which option is to 1214 * be removed before returning in the RFC 2292. 1215 * Note: this constraint is removed in RFC3542. 1216 */ 1217 *mp = sbcreatecontrol((void *)hbh, hbhlen, 1218 IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS), 1219 IPPROTO_IPV6); 1220 if (*mp) 1221 mp = &(*mp)->m_next; 1222 m_freem(ext); 1223 } 1224 } 1225 1226 /* IPV6_DSTOPTS and IPV6_RTHDR socket options */ 1227 if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) { 1228 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1229 int nxt = xip6->ip6_nxt, off = sizeof(struct ip6_hdr); 1230 1231 /* 1232 * Search for destination options headers or routing 1233 * header(s) through the header chain, and stores each 1234 * header as ancillary data. 1235 * Note that the order of the headers remains in 1236 * the chain of ancillary data. 1237 */ 1238 for (;;) { /* is explicit loop prevention necessary? */ 1239 struct ip6_ext *ip6e = NULL; 1240 int elen; 1241 struct mbuf *ext = NULL; 1242 1243 /* 1244 * if it is not an extension header, don't try to 1245 * pull it from the chain. 1246 */ 1247 switch (nxt) { 1248 case IPPROTO_DSTOPTS: 1249 case IPPROTO_ROUTING: 1250 case IPPROTO_HOPOPTS: 1251 case IPPROTO_AH: /* is it possible? */ 1252 break; 1253 default: 1254 goto loopend; 1255 } 1256 1257 ext = ip6_pullexthdr(m, off, nxt); 1258 if (ext == NULL) { 1259 IP6_STATINC(IP6_STAT_TOOSHORT); 1260 return; 1261 } 1262 ip6e = mtod(ext, struct ip6_ext *); 1263 if (nxt == IPPROTO_AH) 1264 elen = (ip6e->ip6e_len + 2) << 2; 1265 else 1266 elen = (ip6e->ip6e_len + 1) << 3; 1267 if (elen != ext->m_len) { 1268 m_freem(ext); 1269 IP6_STATINC(IP6_STAT_TOOSHORT); 1270 return; 1271 } 1272 KASSERT(IP6_HDR_ALIGNED_P(ip6e)); 1273 1274 switch (nxt) { 1275 case IPPROTO_DSTOPTS: 1276 if (!in6p->in6p_flags & IN6P_DSTOPTS) 1277 break; 1278 1279 *mp = sbcreatecontrol((void *)ip6e, elen, 1280 IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS), 1281 IPPROTO_IPV6); 1282 if (*mp) 1283 mp = &(*mp)->m_next; 1284 break; 1285 1286 case IPPROTO_ROUTING: 1287 if (!in6p->in6p_flags & IN6P_RTHDR) 1288 break; 1289 1290 *mp = sbcreatecontrol((void *)ip6e, elen, 1291 IS2292(IPV6_2292RTHDR, IPV6_RTHDR), 1292 IPPROTO_IPV6); 1293 if (*mp) 1294 mp = &(*mp)->m_next; 1295 break; 1296 1297 case IPPROTO_HOPOPTS: 1298 case IPPROTO_AH: /* is it possible? */ 1299 break; 1300 1301 default: 1302 /* 1303 * other cases have been filtered in the above. 1304 * none will visit this case. here we supply 1305 * the code just in case (nxt overwritten or 1306 * other cases). 1307 */ 1308 m_freem(ext); 1309 goto loopend; 1310 1311 } 1312 1313 /* proceed with the next header. */ 1314 off += elen; 1315 nxt = ip6e->ip6e_nxt; 1316 ip6e = NULL; 1317 m_freem(ext); 1318 ext = NULL; 1319 } 1320 loopend: 1321 ; 1322 } 1323 } 1324 #undef IS2292 1325 1326 1327 void 1328 ip6_notify_pmtu(struct in6pcb *in6p, const struct sockaddr_in6 *dst, 1329 uint32_t *mtu) 1330 { 1331 struct socket *so; 1332 struct mbuf *m_mtu; 1333 struct ip6_mtuinfo mtuctl; 1334 1335 so = in6p->in6p_socket; 1336 1337 if (mtu == NULL) 1338 return; 1339 1340 #ifdef DIAGNOSTIC 1341 if (so == NULL) /* I believe this is impossible */ 1342 panic("ip6_notify_pmtu: socket is NULL"); 1343 #endif 1344 1345 memset(&mtuctl, 0, sizeof(mtuctl)); /* zero-clear for safety */ 1346 mtuctl.ip6m_mtu = *mtu; 1347 mtuctl.ip6m_addr = *dst; 1348 if (sa6_recoverscope(&mtuctl.ip6m_addr)) 1349 return; 1350 1351 if ((m_mtu = sbcreatecontrol((void *)&mtuctl, sizeof(mtuctl), 1352 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL) 1353 return; 1354 1355 if (sbappendaddr(&so->so_rcv, (const struct sockaddr *)dst, NULL, m_mtu) 1356 == 0) { 1357 m_freem(m_mtu); 1358 /* XXX: should count statistics */ 1359 } else 1360 sorwakeup(so); 1361 1362 return; 1363 } 1364 1365 /* 1366 * pull single extension header from mbuf chain. returns single mbuf that 1367 * contains the result, or NULL on error. 1368 */ 1369 static struct mbuf * 1370 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt) 1371 { 1372 struct ip6_ext ip6e; 1373 size_t elen; 1374 struct mbuf *n; 1375 1376 #ifdef DIAGNOSTIC 1377 switch (nxt) { 1378 case IPPROTO_DSTOPTS: 1379 case IPPROTO_ROUTING: 1380 case IPPROTO_HOPOPTS: 1381 case IPPROTO_AH: /* is it possible? */ 1382 break; 1383 default: 1384 printf("ip6_pullexthdr: invalid nxt=%d\n", nxt); 1385 } 1386 #endif 1387 1388 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1389 if (nxt == IPPROTO_AH) 1390 elen = (ip6e.ip6e_len + 2) << 2; 1391 else 1392 elen = (ip6e.ip6e_len + 1) << 3; 1393 1394 MGET(n, M_DONTWAIT, MT_DATA); 1395 if (n && elen >= MLEN) { 1396 MCLGET(n, M_DONTWAIT); 1397 if ((n->m_flags & M_EXT) == 0) { 1398 m_free(n); 1399 n = NULL; 1400 } 1401 } 1402 if (!n) 1403 return NULL; 1404 1405 n->m_len = 0; 1406 if (elen >= M_TRAILINGSPACE(n)) { 1407 m_free(n); 1408 return NULL; 1409 } 1410 1411 m_copydata(m, off, elen, mtod(n, void *)); 1412 n->m_len = elen; 1413 return n; 1414 } 1415 1416 /* 1417 * Get pointer to the previous header followed by the header 1418 * currently processed. 1419 * XXX: This function supposes that 1420 * M includes all headers, 1421 * the next header field and the header length field of each header 1422 * are valid, and 1423 * the sum of each header length equals to OFF. 1424 * Because of these assumptions, this function must be called very 1425 * carefully. Moreover, it will not be used in the near future when 1426 * we develop `neater' mechanism to process extension headers. 1427 */ 1428 u_int8_t * 1429 ip6_get_prevhdr(struct mbuf *m, int off) 1430 { 1431 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1432 1433 if (off == sizeof(struct ip6_hdr)) 1434 return (&ip6->ip6_nxt); 1435 else { 1436 int len, nxt; 1437 struct ip6_ext *ip6e = NULL; 1438 1439 nxt = ip6->ip6_nxt; 1440 len = sizeof(struct ip6_hdr); 1441 while (len < off) { 1442 ip6e = (struct ip6_ext *)(mtod(m, char *) + len); 1443 1444 switch (nxt) { 1445 case IPPROTO_FRAGMENT: 1446 len += sizeof(struct ip6_frag); 1447 break; 1448 case IPPROTO_AH: 1449 len += (ip6e->ip6e_len + 2) << 2; 1450 break; 1451 default: 1452 len += (ip6e->ip6e_len + 1) << 3; 1453 break; 1454 } 1455 nxt = ip6e->ip6e_nxt; 1456 } 1457 if (ip6e) 1458 return (&ip6e->ip6e_nxt); 1459 else 1460 return NULL; 1461 } 1462 } 1463 1464 /* 1465 * get next header offset. m will be retained. 1466 */ 1467 int 1468 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp) 1469 { 1470 struct ip6_hdr ip6; 1471 struct ip6_ext ip6e; 1472 struct ip6_frag fh; 1473 1474 /* just in case */ 1475 if (m == NULL) 1476 panic("ip6_nexthdr: m == NULL"); 1477 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off) 1478 return -1; 1479 1480 switch (proto) { 1481 case IPPROTO_IPV6: 1482 /* do not chase beyond intermediate IPv6 headers */ 1483 if (off != 0) 1484 return -1; 1485 if (m->m_pkthdr.len < off + sizeof(ip6)) 1486 return -1; 1487 m_copydata(m, off, sizeof(ip6), (void *)&ip6); 1488 if (nxtp) 1489 *nxtp = ip6.ip6_nxt; 1490 off += sizeof(ip6); 1491 return off; 1492 1493 case IPPROTO_FRAGMENT: 1494 /* 1495 * terminate parsing if it is not the first fragment, 1496 * it does not make sense to parse through it. 1497 */ 1498 if (m->m_pkthdr.len < off + sizeof(fh)) 1499 return -1; 1500 m_copydata(m, off, sizeof(fh), (void *)&fh); 1501 if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0) 1502 return -1; 1503 if (nxtp) 1504 *nxtp = fh.ip6f_nxt; 1505 off += sizeof(struct ip6_frag); 1506 return off; 1507 1508 case IPPROTO_AH: 1509 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1510 return -1; 1511 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1512 if (nxtp) 1513 *nxtp = ip6e.ip6e_nxt; 1514 off += (ip6e.ip6e_len + 2) << 2; 1515 if (m->m_pkthdr.len < off) 1516 return -1; 1517 return off; 1518 1519 case IPPROTO_HOPOPTS: 1520 case IPPROTO_ROUTING: 1521 case IPPROTO_DSTOPTS: 1522 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1523 return -1; 1524 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1525 if (nxtp) 1526 *nxtp = ip6e.ip6e_nxt; 1527 off += (ip6e.ip6e_len + 1) << 3; 1528 if (m->m_pkthdr.len < off) 1529 return -1; 1530 return off; 1531 1532 case IPPROTO_NONE: 1533 case IPPROTO_ESP: 1534 case IPPROTO_IPCOMP: 1535 /* give up */ 1536 return -1; 1537 1538 default: 1539 return -1; 1540 } 1541 } 1542 1543 /* 1544 * get offset for the last header in the chain. m will be kept untainted. 1545 */ 1546 int 1547 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp) 1548 { 1549 int newoff; 1550 int nxt; 1551 1552 if (!nxtp) { 1553 nxt = -1; 1554 nxtp = &nxt; 1555 } 1556 for (;;) { 1557 newoff = ip6_nexthdr(m, off, proto, nxtp); 1558 if (newoff < 0) 1559 return off; 1560 else if (newoff < off) 1561 return -1; /* invalid */ 1562 else if (newoff == off) 1563 return newoff; 1564 1565 off = newoff; 1566 proto = *nxtp; 1567 } 1568 } 1569 1570 struct m_tag * 1571 ip6_addaux(struct mbuf *m) 1572 { 1573 struct m_tag *mtag; 1574 1575 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1576 if (!mtag) { 1577 mtag = m_tag_get(PACKET_TAG_INET6, sizeof(struct ip6aux), 1578 M_NOWAIT); 1579 if (mtag) { 1580 m_tag_prepend(m, mtag); 1581 memset(mtag + 1, 0, sizeof(struct ip6aux)); 1582 } 1583 } 1584 return mtag; 1585 } 1586 1587 struct m_tag * 1588 ip6_findaux(struct mbuf *m) 1589 { 1590 struct m_tag *mtag; 1591 1592 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1593 return mtag; 1594 } 1595 1596 void 1597 ip6_delaux(struct mbuf *m) 1598 { 1599 struct m_tag *mtag; 1600 1601 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1602 if (mtag) 1603 m_tag_delete(m, mtag); 1604 } 1605 1606 #ifdef GATEWAY 1607 /* 1608 * sysctl helper routine for net.inet.ip6.maxflows. Since 1609 * we could reduce this value, call ip6flow_reap(); 1610 */ 1611 static int 1612 sysctl_net_inet6_ip6_maxflows(SYSCTLFN_ARGS) 1613 { 1614 int error; 1615 1616 error = sysctl_lookup(SYSCTLFN_CALL(rnode)); 1617 if (error || newp == NULL) 1618 return (error); 1619 1620 mutex_enter(softnet_lock); 1621 KERNEL_LOCK(1, NULL); 1622 1623 ip6flow_reap(0); 1624 1625 KERNEL_UNLOCK_ONE(NULL); 1626 mutex_exit(softnet_lock); 1627 1628 return (0); 1629 } 1630 1631 static int 1632 sysctl_net_inet6_ip6_hashsize(SYSCTLFN_ARGS) 1633 { 1634 int error, tmp; 1635 struct sysctlnode node; 1636 1637 node = *rnode; 1638 tmp = ip6_hashsize; 1639 node.sysctl_data = &tmp; 1640 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 1641 if (error || newp == NULL) 1642 return (error); 1643 1644 if ((tmp & (tmp - 1)) == 0 && tmp != 0) { 1645 /* 1646 * Can only fail due to malloc() 1647 */ 1648 mutex_enter(softnet_lock); 1649 KERNEL_LOCK(1, NULL); 1650 1651 error = ip6flow_invalidate_all(tmp); 1652 1653 KERNEL_UNLOCK_ONE(NULL); 1654 mutex_exit(softnet_lock); 1655 } else { 1656 /* 1657 * EINVAL if not a power of 2 1658 */ 1659 error = EINVAL; 1660 } 1661 1662 return error; 1663 } 1664 #endif /* GATEWAY */ 1665 1666 /* 1667 * System control for IP6 1668 */ 1669 1670 const u_char inet6ctlerrmap[PRC_NCMDS] = { 1671 0, 0, 0, 0, 1672 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 1673 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 1674 EMSGSIZE, EHOSTUNREACH, 0, 0, 1675 0, 0, 0, 0, 1676 ENOPROTOOPT 1677 }; 1678 1679 static int 1680 sysctl_net_inet6_ip6_stats(SYSCTLFN_ARGS) 1681 { 1682 1683 return (NETSTAT_SYSCTL(ip6stat_percpu, IP6_NSTATS)); 1684 } 1685 1686 SYSCTL_SETUP(sysctl_net_inet6_ip6_setup, "sysctl net.inet6.ip6 subtree setup") 1687 { 1688 #ifdef RFC2292 1689 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y)) 1690 #else 1691 #define IS2292(x, y) (y) 1692 #endif 1693 1694 sysctl_createv(clog, 0, NULL, NULL, 1695 CTLFLAG_PERMANENT, 1696 CTLTYPE_NODE, "net", NULL, 1697 NULL, 0, NULL, 0, 1698 CTL_NET, CTL_EOL); 1699 sysctl_createv(clog, 0, NULL, NULL, 1700 CTLFLAG_PERMANENT, 1701 CTLTYPE_NODE, "inet6", 1702 SYSCTL_DESCR("PF_INET6 related settings"), 1703 NULL, 0, NULL, 0, 1704 CTL_NET, PF_INET6, CTL_EOL); 1705 sysctl_createv(clog, 0, NULL, NULL, 1706 CTLFLAG_PERMANENT, 1707 CTLTYPE_NODE, "ip6", 1708 SYSCTL_DESCR("IPv6 related settings"), 1709 NULL, 0, NULL, 0, 1710 CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_EOL); 1711 1712 sysctl_createv(clog, 0, NULL, NULL, 1713 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1714 CTLTYPE_INT, "forwarding", 1715 SYSCTL_DESCR("Enable forwarding of INET6 datagrams"), 1716 NULL, 0, &ip6_forwarding, 0, 1717 CTL_NET, PF_INET6, IPPROTO_IPV6, 1718 IPV6CTL_FORWARDING, CTL_EOL); 1719 sysctl_createv(clog, 0, NULL, NULL, 1720 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1721 CTLTYPE_INT, "redirect", 1722 SYSCTL_DESCR("Enable sending of ICMPv6 redirect messages"), 1723 NULL, 0, &ip6_sendredirects, 0, 1724 CTL_NET, PF_INET6, IPPROTO_IPV6, 1725 IPV6CTL_SENDREDIRECTS, CTL_EOL); 1726 sysctl_createv(clog, 0, NULL, NULL, 1727 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1728 CTLTYPE_INT, "hlim", 1729 SYSCTL_DESCR("Hop limit for an INET6 datagram"), 1730 NULL, 0, &ip6_defhlim, 0, 1731 CTL_NET, PF_INET6, IPPROTO_IPV6, 1732 IPV6CTL_DEFHLIM, CTL_EOL); 1733 #ifdef notyet 1734 sysctl_createv(clog, 0, NULL, NULL, 1735 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1736 CTLTYPE_INT, "mtu", NULL, 1737 NULL, 0, &, 0, 1738 CTL_NET, PF_INET6, IPPROTO_IPV6, 1739 IPV6CTL_DEFMTU, CTL_EOL); 1740 #endif 1741 #ifdef __no_idea__ 1742 sysctl_createv(clog, 0, NULL, NULL, 1743 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1744 CTLTYPE_INT, "forwsrcrt", NULL, 1745 NULL, 0, &?, 0, 1746 CTL_NET, PF_INET6, IPPROTO_IPV6, 1747 IPV6CTL_FORWSRCRT, CTL_EOL); 1748 sysctl_createv(clog, 0, NULL, NULL, 1749 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1750 CTLTYPE_STRUCT, "mrtstats", NULL, 1751 NULL, 0, &?, sizeof(?), 1752 CTL_NET, PF_INET6, IPPROTO_IPV6, 1753 IPV6CTL_MRTSTATS, CTL_EOL); 1754 sysctl_createv(clog, 0, NULL, NULL, 1755 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1756 CTLTYPE_?, "mrtproto", NULL, 1757 NULL, 0, &?, sizeof(?), 1758 CTL_NET, PF_INET6, IPPROTO_IPV6, 1759 IPV6CTL_MRTPROTO, CTL_EOL); 1760 #endif 1761 sysctl_createv(clog, 0, NULL, NULL, 1762 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1763 CTLTYPE_INT, "maxfragpackets", 1764 SYSCTL_DESCR("Maximum number of fragments to buffer " 1765 "for reassembly"), 1766 NULL, 0, &ip6_maxfragpackets, 0, 1767 CTL_NET, PF_INET6, IPPROTO_IPV6, 1768 IPV6CTL_MAXFRAGPACKETS, CTL_EOL); 1769 #ifdef __no_idea__ 1770 sysctl_createv(clog, 0, NULL, NULL, 1771 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1772 CTLTYPE_INT, "sourcecheck", NULL, 1773 NULL, 0, &?, 0, 1774 CTL_NET, PF_INET6, IPPROTO_IPV6, 1775 IPV6CTL_SOURCECHECK, CTL_EOL); 1776 sysctl_createv(clog, 0, NULL, NULL, 1777 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1778 CTLTYPE_INT, "sourcecheck_logint", NULL, 1779 NULL, 0, &?, 0, 1780 CTL_NET, PF_INET6, IPPROTO_IPV6, 1781 IPV6CTL_SOURCECHECK_LOGINT, CTL_EOL); 1782 #endif 1783 sysctl_createv(clog, 0, NULL, NULL, 1784 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1785 CTLTYPE_INT, "accept_rtadv", 1786 SYSCTL_DESCR("Accept router advertisements"), 1787 NULL, 0, &ip6_accept_rtadv, 0, 1788 CTL_NET, PF_INET6, IPPROTO_IPV6, 1789 IPV6CTL_ACCEPT_RTADV, CTL_EOL); 1790 sysctl_createv(clog, 0, NULL, NULL, 1791 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1792 CTLTYPE_INT, "keepfaith", 1793 SYSCTL_DESCR("Activate faith interface"), 1794 NULL, 0, &ip6_keepfaith, 0, 1795 CTL_NET, PF_INET6, IPPROTO_IPV6, 1796 IPV6CTL_KEEPFAITH, CTL_EOL); 1797 sysctl_createv(clog, 0, NULL, NULL, 1798 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1799 CTLTYPE_INT, "log_interval", 1800 SYSCTL_DESCR("Minumum interval between logging " 1801 "unroutable packets"), 1802 NULL, 0, &ip6_log_interval, 0, 1803 CTL_NET, PF_INET6, IPPROTO_IPV6, 1804 IPV6CTL_LOG_INTERVAL, CTL_EOL); 1805 sysctl_createv(clog, 0, NULL, NULL, 1806 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1807 CTLTYPE_INT, "hdrnestlimit", 1808 SYSCTL_DESCR("Maximum number of nested IPv6 headers"), 1809 NULL, 0, &ip6_hdrnestlimit, 0, 1810 CTL_NET, PF_INET6, IPPROTO_IPV6, 1811 IPV6CTL_HDRNESTLIMIT, CTL_EOL); 1812 sysctl_createv(clog, 0, NULL, NULL, 1813 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1814 CTLTYPE_INT, "dad_count", 1815 SYSCTL_DESCR("Number of Duplicate Address Detection " 1816 "probes to send"), 1817 NULL, 0, &ip6_dad_count, 0, 1818 CTL_NET, PF_INET6, IPPROTO_IPV6, 1819 IPV6CTL_DAD_COUNT, CTL_EOL); 1820 sysctl_createv(clog, 0, NULL, NULL, 1821 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1822 CTLTYPE_INT, "auto_flowlabel", 1823 SYSCTL_DESCR("Assign random IPv6 flow labels"), 1824 NULL, 0, &ip6_auto_flowlabel, 0, 1825 CTL_NET, PF_INET6, IPPROTO_IPV6, 1826 IPV6CTL_AUTO_FLOWLABEL, CTL_EOL); 1827 sysctl_createv(clog, 0, NULL, NULL, 1828 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1829 CTLTYPE_INT, "defmcasthlim", 1830 SYSCTL_DESCR("Default multicast hop limit"), 1831 NULL, 0, &ip6_defmcasthlim, 0, 1832 CTL_NET, PF_INET6, IPPROTO_IPV6, 1833 IPV6CTL_DEFMCASTHLIM, CTL_EOL); 1834 #if NGIF > 0 1835 sysctl_createv(clog, 0, NULL, NULL, 1836 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1837 CTLTYPE_INT, "gifhlim", 1838 SYSCTL_DESCR("Default hop limit for a gif tunnel datagram"), 1839 NULL, 0, &ip6_gif_hlim, 0, 1840 CTL_NET, PF_INET6, IPPROTO_IPV6, 1841 IPV6CTL_GIF_HLIM, CTL_EOL); 1842 #endif /* NGIF */ 1843 sysctl_createv(clog, 0, NULL, NULL, 1844 CTLFLAG_PERMANENT, 1845 CTLTYPE_STRING, "kame_version", 1846 SYSCTL_DESCR("KAME Version"), 1847 NULL, 0, __UNCONST(__KAME_VERSION), 0, 1848 CTL_NET, PF_INET6, IPPROTO_IPV6, 1849 IPV6CTL_KAME_VERSION, CTL_EOL); 1850 sysctl_createv(clog, 0, NULL, NULL, 1851 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1852 CTLTYPE_INT, "use_deprecated", 1853 SYSCTL_DESCR("Allow use of deprecated addresses as " 1854 "source addresses"), 1855 NULL, 0, &ip6_use_deprecated, 0, 1856 CTL_NET, PF_INET6, IPPROTO_IPV6, 1857 IPV6CTL_USE_DEPRECATED, CTL_EOL); 1858 sysctl_createv(clog, 0, NULL, NULL, 1859 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1860 CTLTYPE_INT, "rr_prune", NULL, 1861 NULL, 0, &ip6_rr_prune, 0, 1862 CTL_NET, PF_INET6, IPPROTO_IPV6, 1863 IPV6CTL_RR_PRUNE, CTL_EOL); 1864 sysctl_createv(clog, 0, NULL, NULL, 1865 CTLFLAG_PERMANENT 1866 #ifndef INET6_BINDV6ONLY 1867 |CTLFLAG_READWRITE, 1868 #endif 1869 CTLTYPE_INT, "v6only", 1870 SYSCTL_DESCR("Disallow PF_INET6 sockets from connecting " 1871 "to PF_INET sockets"), 1872 NULL, 0, &ip6_v6only, 0, 1873 CTL_NET, PF_INET6, IPPROTO_IPV6, 1874 IPV6CTL_V6ONLY, CTL_EOL); 1875 sysctl_createv(clog, 0, NULL, NULL, 1876 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1877 CTLTYPE_INT, "anonportmin", 1878 SYSCTL_DESCR("Lowest ephemeral port number to assign"), 1879 sysctl_net_inet_ip_ports, 0, &ip6_anonportmin, 0, 1880 CTL_NET, PF_INET6, IPPROTO_IPV6, 1881 IPV6CTL_ANONPORTMIN, CTL_EOL); 1882 sysctl_createv(clog, 0, NULL, NULL, 1883 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1884 CTLTYPE_INT, "anonportmax", 1885 SYSCTL_DESCR("Highest ephemeral port number to assign"), 1886 sysctl_net_inet_ip_ports, 0, &ip6_anonportmax, 0, 1887 CTL_NET, PF_INET6, IPPROTO_IPV6, 1888 IPV6CTL_ANONPORTMAX, CTL_EOL); 1889 #ifndef IPNOPRIVPORTS 1890 sysctl_createv(clog, 0, NULL, NULL, 1891 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1892 CTLTYPE_INT, "lowportmin", 1893 SYSCTL_DESCR("Lowest privileged ephemeral port number " 1894 "to assign"), 1895 sysctl_net_inet_ip_ports, 0, &ip6_lowportmin, 0, 1896 CTL_NET, PF_INET6, IPPROTO_IPV6, 1897 IPV6CTL_LOWPORTMIN, CTL_EOL); 1898 sysctl_createv(clog, 0, NULL, NULL, 1899 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1900 CTLTYPE_INT, "lowportmax", 1901 SYSCTL_DESCR("Highest privileged ephemeral port number " 1902 "to assign"), 1903 sysctl_net_inet_ip_ports, 0, &ip6_lowportmax, 0, 1904 CTL_NET, PF_INET6, IPPROTO_IPV6, 1905 IPV6CTL_LOWPORTMAX, CTL_EOL); 1906 #endif /* IPNOPRIVPORTS */ 1907 sysctl_createv(clog, 0, NULL, NULL, 1908 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1909 CTLTYPE_INT, "use_tempaddr", 1910 SYSCTL_DESCR("Use temporary address"), 1911 NULL, 0, &ip6_use_tempaddr, 0, 1912 CTL_NET, PF_INET6, IPPROTO_IPV6, 1913 CTL_CREATE, CTL_EOL); 1914 sysctl_createv(clog, 0, NULL, NULL, 1915 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1916 CTLTYPE_INT, "temppltime", 1917 SYSCTL_DESCR("preferred lifetime of a temporary address"), 1918 NULL, 0, &ip6_temp_preferred_lifetime, 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, "tempvltime", 1924 SYSCTL_DESCR("valid lifetime of a temporary address"), 1925 NULL, 0, &ip6_temp_valid_lifetime, 0, 1926 CTL_NET, PF_INET6, IPPROTO_IPV6, 1927 CTL_CREATE, CTL_EOL); 1928 sysctl_createv(clog, 0, NULL, NULL, 1929 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1930 CTLTYPE_INT, "maxfrags", 1931 SYSCTL_DESCR("Maximum fragments in reassembly queue"), 1932 NULL, 0, &ip6_maxfrags, 0, 1933 CTL_NET, PF_INET6, IPPROTO_IPV6, 1934 IPV6CTL_MAXFRAGS, CTL_EOL); 1935 sysctl_createv(clog, 0, NULL, NULL, 1936 CTLFLAG_PERMANENT, 1937 CTLTYPE_STRUCT, "stats", 1938 SYSCTL_DESCR("IPv6 statistics"), 1939 sysctl_net_inet6_ip6_stats, 0, NULL, 0, 1940 CTL_NET, PF_INET6, IPPROTO_IPV6, 1941 IPV6CTL_STATS, CTL_EOL); 1942 sysctl_createv(clog, 0, NULL, NULL, 1943 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1944 CTLTYPE_INT, "use_defaultzone", 1945 SYSCTL_DESCR("Whether to use the default scope zones"), 1946 NULL, 0, &ip6_use_defzone, 0, 1947 CTL_NET, PF_INET6, IPPROTO_IPV6, 1948 IPV6CTL_USE_DEFAULTZONE, CTL_EOL); 1949 sysctl_createv(clog, 0, NULL, NULL, 1950 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1951 CTLTYPE_INT, "mcast_pmtu", 1952 SYSCTL_DESCR("Enable pMTU discovery for multicast packet"), 1953 NULL, 0, &ip6_mcast_pmtu, 0, 1954 CTL_NET, PF_INET6, IPPROTO_IPV6, 1955 CTL_CREATE, CTL_EOL); 1956 #ifdef GATEWAY 1957 sysctl_createv(clog, 0, NULL, NULL, 1958 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1959 CTLTYPE_INT, "maxflows", 1960 SYSCTL_DESCR("Number of flows for fast forwarding (IPv6)"), 1961 sysctl_net_inet6_ip6_maxflows, 0, &ip6_maxflows, 0, 1962 CTL_NET, PF_INET6, IPPROTO_IPV6, 1963 CTL_CREATE, CTL_EOL); 1964 sysctl_createv(clog, 0, NULL, NULL, 1965 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1966 CTLTYPE_INT, "hashsize", 1967 SYSCTL_DESCR("Size of hash table for fast forwarding (IPv6)"), 1968 sysctl_net_inet6_ip6_hashsize, 0, &ip6_hashsize, 0, 1969 CTL_NET, PF_INET6, IPPROTO_IPV6, 1970 CTL_CREATE, CTL_EOL); 1971 #endif 1972 } 1973 1974 void 1975 ip6_statinc(u_int stat) 1976 { 1977 1978 KASSERT(stat < IP6_NSTATS); 1979 IP6_STATINC(stat); 1980 } 1981
Indexes created Tue Sep 23 14:10:03 GMT 2025