ip6_input.c revision 1.119
1 /* $NetBSD: ip6_input.c,v 1.119 2008/05/04 07:22:15 thorpej 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 1.119 2008/05/04 07:22:15 thorpej Exp $"); 66 67 #include "opt_inet.h" 68 #include "opt_inet6.h" 69 #include "opt_ipsec.h" 70 #include "opt_pfil_hooks.h" 71 72 #include <sys/param.h> 73 #include <sys/systm.h> 74 #include <sys/malloc.h> 75 #include <sys/mbuf.h> 76 #include <sys/domain.h> 77 #include <sys/protosw.h> 78 #include <sys/socket.h> 79 #include <sys/socketvar.h> 80 #include <sys/errno.h> 81 #include <sys/time.h> 82 #include <sys/kernel.h> 83 #include <sys/syslog.h> 84 #include <sys/proc.h> 85 #include <sys/sysctl.h> 86 87 #include <net/if.h> 88 #include <net/if_types.h> 89 #include <net/if_dl.h> 90 #include <net/route.h> 91 #include <net/netisr.h> 92 #ifdef PFIL_HOOKS 93 #include <net/pfil.h> 94 #endif 95 96 #include <netinet/in.h> 97 #include <netinet/in_systm.h> 98 #ifdef INET 99 #include <netinet/ip.h> 100 #include <netinet/ip_icmp.h> 101 #endif /* INET */ 102 #include <netinet/ip6.h> 103 #include <netinet6/in6_var.h> 104 #include <netinet6/ip6_var.h> 105 #include <netinet6/ip6_private.h> 106 #include <netinet6/in6_pcb.h> 107 #include <netinet/icmp6.h> 108 #include <netinet6/scope6_var.h> 109 #include <netinet6/in6_ifattach.h> 110 #include <netinet6/nd6.h> 111 112 #ifdef IPSEC 113 #include <netinet6/ipsec.h> 114 #include <netinet6/ipsec_private.h> 115 #endif 116 117 #ifdef FAST_IPSEC 118 #include <netipsec/ipsec.h> 119 #include <netipsec/ipsec6.h> 120 #include <netipsec/key.h> 121 #endif /* FAST_IPSEC */ 122 123 #include <netinet6/ip6protosw.h> 124 125 #include "faith.h" 126 #include "gif.h" 127 128 #if NGIF > 0 129 #include <netinet6/in6_gif.h> 130 #endif 131 132 #include <net/net_osdep.h> 133 134 extern struct domain inet6domain; 135 136 u_char ip6_protox[IPPROTO_MAX]; 137 static int ip6qmaxlen = IFQ_MAXLEN; 138 struct in6_ifaddr *in6_ifaddr; 139 struct ifqueue ip6intrq; 140 141 extern callout_t in6_tmpaddrtimer_ch; 142 143 int ip6_forward_srcrt; /* XXX */ 144 int ip6_sourcecheck; /* XXX */ 145 int ip6_sourcecheck_interval; /* XXX */ 146 147 #ifdef PFIL_HOOKS 148 struct pfil_head inet6_pfil_hook; 149 #endif 150 151 percpu_t *ip6stat_percpu; 152 153 static void ip6_init2(void *); 154 static struct m_tag *ip6_setdstifaddr(struct mbuf *, const struct in6_ifaddr *); 155 156 static int ip6_hopopts_input(u_int32_t *, u_int32_t *, struct mbuf **, int *); 157 static struct mbuf *ip6_pullexthdr(struct mbuf *, size_t, int); 158 159 /* 160 * IP6 initialization: fill in IP6 protocol switch table. 161 * All protocols not implemented in kernel go to raw IP6 protocol handler. 162 */ 163 void 164 ip6_init(void) 165 { 166 const struct ip6protosw *pr; 167 int i; 168 169 pr = (const struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 170 if (pr == 0) 171 panic("ip6_init"); 172 for (i = 0; i < IPPROTO_MAX; i++) 173 ip6_protox[i] = pr - inet6sw; 174 for (pr = (const struct ip6protosw *)inet6domain.dom_protosw; 175 pr < (const struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++) 176 if (pr->pr_domain->dom_family == PF_INET6 && 177 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) 178 ip6_protox[pr->pr_protocol] = pr - inet6sw; 179 ip6intrq.ifq_maxlen = ip6qmaxlen; 180 scope6_init(); 181 addrsel_policy_init(); 182 nd6_init(); 183 frag6_init(); 184 ip6_desync_factor = arc4random() % MAX_TEMP_DESYNC_FACTOR; 185 186 ip6_init2((void *)0); 187 #ifdef GATEWAY 188 ip6flow_init(ip6_hashsize); 189 #endif 190 191 #ifdef PFIL_HOOKS 192 /* Register our Packet Filter hook. */ 193 inet6_pfil_hook.ph_type = PFIL_TYPE_AF; 194 inet6_pfil_hook.ph_af = AF_INET6; 195 i = pfil_head_register(&inet6_pfil_hook); 196 if (i != 0) 197 printf("ip6_init: WARNING: unable to register pfil hook, " 198 "error %d\n", i); 199 #endif /* PFIL_HOOKS */ 200 201 ip6stat_percpu = percpu_alloc(sizeof(uint64_t) * IP6_NSTATS); 202 } 203 204 static void 205 ip6_init2(void *dummy) 206 { 207 208 /* nd6_timer_init */ 209 callout_init(&nd6_timer_ch, CALLOUT_MPSAFE); 210 callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL); 211 212 /* timer for regeneranation of temporary addresses randomize ID */ 213 callout_init(&in6_tmpaddrtimer_ch, CALLOUT_MPSAFE); 214 callout_reset(&in6_tmpaddrtimer_ch, 215 (ip6_temp_preferred_lifetime - ip6_desync_factor - 216 ip6_temp_regen_advance) * hz, 217 in6_tmpaddrtimer, NULL); 218 } 219 220 /* 221 * IP6 input interrupt handling. Just pass the packet to ip6_input. 222 */ 223 void 224 ip6intr(void) 225 { 226 int s; 227 struct mbuf *m; 228 229 mutex_enter(softnet_lock); 230 KERNEL_LOCK(1, NULL); 231 for (;;) { 232 s = splnet(); 233 IF_DEQUEUE(&ip6intrq, m); 234 splx(s); 235 if (m == 0) 236 break; 237 /* drop the packet if IPv6 operation is disabled on the IF */ 238 if ((ND_IFINFO(m->m_pkthdr.rcvif)->flags & ND6_IFF_IFDISABLED)) { 239 m_freem(m); 240 break; 241 } 242 ip6_input(m); 243 } 244 KERNEL_UNLOCK_ONE(NULL); 245 mutex_exit(softnet_lock); 246 } 247 248 extern struct route ip6_forward_rt; 249 250 void 251 ip6_input(struct mbuf *m) 252 { 253 struct ip6_hdr *ip6; 254 int hit, off = sizeof(struct ip6_hdr), nest; 255 u_int32_t plen; 256 u_int32_t rtalert = ~0; 257 int nxt, ours = 0, rh_present = 0; 258 struct ifnet *deliverifp = NULL; 259 int srcrt = 0; 260 const struct rtentry *rt; 261 union { 262 struct sockaddr dst; 263 struct sockaddr_in6 dst6; 264 } u; 265 #ifdef FAST_IPSEC 266 struct m_tag *mtag; 267 struct tdb_ident *tdbi; 268 struct secpolicy *sp; 269 int s, error; 270 #endif 271 272 #ifdef IPSEC 273 /* 274 * should the inner packet be considered authentic? 275 * see comment in ah4_input(). 276 */ 277 m->m_flags &= ~M_AUTHIPHDR; 278 m->m_flags &= ~M_AUTHIPDGM; 279 #endif 280 281 /* 282 * make sure we don't have onion peering information into m_tag. 283 */ 284 ip6_delaux(m); 285 286 /* 287 * mbuf statistics 288 */ 289 if (m->m_flags & M_EXT) { 290 if (m->m_next) 291 IP6_STATINC(IP6_STAT_MEXT2M); 292 else 293 IP6_STATINC(IP6_STAT_MEXT1); 294 } else { 295 #define M2MMAX 32 296 if (m->m_next) { 297 if (m->m_flags & M_LOOP) { 298 /*XXX*/ IP6_STATINC(IP6_STAT_M2M + lo0ifp->if_index); 299 } else if (m->m_pkthdr.rcvif->if_index < M2MMAX) { 300 IP6_STATINC(IP6_STAT_M2M + 301 m->m_pkthdr.rcvif->if_index); 302 } else 303 IP6_STATINC(IP6_STAT_M2M); 304 } else 305 IP6_STATINC(IP6_STAT_M1); 306 #undef M2MMAX 307 } 308 309 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive); 310 IP6_STATINC(IP6_STAT_TOTAL); 311 312 /* 313 * If the IPv6 header is not aligned, slurp it up into a new 314 * mbuf with space for link headers, in the event we forward 315 * it. Otherwise, if it is aligned, make sure the entire base 316 * IPv6 header is in the first mbuf of the chain. 317 */ 318 if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 319 struct ifnet *inifp = m->m_pkthdr.rcvif; 320 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 321 (max_linkhdr + 3) & ~3)) == NULL) { 322 /* XXXJRT new stat, please */ 323 IP6_STATINC(IP6_STAT_TOOSMALL); 324 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 325 return; 326 } 327 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 328 struct ifnet *inifp = m->m_pkthdr.rcvif; 329 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 330 IP6_STATINC(IP6_STAT_TOOSMALL); 331 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 332 return; 333 } 334 } 335 336 ip6 = mtod(m, struct ip6_hdr *); 337 338 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 339 IP6_STATINC(IP6_STAT_BADVERS); 340 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 341 goto bad; 342 } 343 344 #if defined(IPSEC) 345 /* IPv6 fast forwarding is not compatible with IPsec. */ 346 m->m_flags &= ~M_CANFASTFWD; 347 #else 348 /* 349 * Assume that we can create a fast-forward IP flow entry 350 * based on this packet. 351 */ 352 m->m_flags |= M_CANFASTFWD; 353 #endif 354 355 #ifdef PFIL_HOOKS 356 /* 357 * Run through list of hooks for input packets. If there are any 358 * filters which require that additional packets in the flow are 359 * not fast-forwarded, they must clear the M_CANFASTFWD flag. 360 * Note that filters must _never_ set this flag, as another filter 361 * in the list may have previously cleared it. 362 */ 363 /* 364 * let ipfilter look at packet on the wire, 365 * not the decapsulated packet. 366 */ 367 #ifdef IPSEC 368 if (!ipsec_getnhist(m)) 369 #elif defined(FAST_IPSEC) 370 if (!ipsec_indone(m)) 371 #else 372 if (1) 373 #endif 374 { 375 struct in6_addr odst; 376 377 odst = ip6->ip6_dst; 378 if (pfil_run_hooks(&inet6_pfil_hook, &m, m->m_pkthdr.rcvif, 379 PFIL_IN) != 0) 380 return; 381 if (m == NULL) 382 return; 383 ip6 = mtod(m, struct ip6_hdr *); 384 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst); 385 } 386 #endif /* PFIL_HOOKS */ 387 388 IP6_STATINC(IP6_STAT_NXTHIST + ip6->ip6_nxt); 389 390 #ifdef ALTQ 391 if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) { 392 /* packet is dropped by traffic conditioner */ 393 return; 394 } 395 #endif 396 397 /* 398 * Check against address spoofing/corruption. 399 */ 400 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) || 401 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) { 402 /* 403 * XXX: "badscope" is not very suitable for a multicast source. 404 */ 405 IP6_STATINC(IP6_STAT_BADSCOPE); 406 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 407 goto bad; 408 } 409 /* 410 * The following check is not documented in specs. A malicious 411 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack 412 * and bypass security checks (act as if it was from 127.0.0.1 by using 413 * IPv6 src ::ffff:127.0.0.1). Be cautious. 414 * 415 * This check chokes if we are in an SIIT cloud. As none of BSDs 416 * support IPv4-less kernel compilation, we cannot support SIIT 417 * environment at all. So, it makes more sense for us to reject any 418 * malicious packets for non-SIIT environment, than try to do a 419 * partial support for SIIT environment. 420 */ 421 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 422 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 423 IP6_STATINC(IP6_STAT_BADSCOPE); 424 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 425 goto bad; 426 } 427 #if 0 428 /* 429 * Reject packets with IPv4 compatible addresses (auto tunnel). 430 * 431 * The code forbids auto tunnel relay case in RFC1933 (the check is 432 * stronger than RFC1933). We may want to re-enable it if mech-xx 433 * is revised to forbid relaying case. 434 */ 435 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) || 436 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) { 437 IP6_STATINC(IP6_STAT_BADSCOPE); 438 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 439 goto bad; 440 } 441 #endif 442 443 /* 444 * Disambiguate address scope zones (if there is ambiguity). 445 * We first make sure that the original source or destination address 446 * is not in our internal form for scoped addresses. Such addresses 447 * are not necessarily invalid spec-wise, but we cannot accept them due 448 * to the usage conflict. 449 * in6_setscope() then also checks and rejects the cases where src or 450 * dst are the loopback address and the receiving interface 451 * is not loopback. 452 */ 453 if (__predict_false( 454 m_makewritable(&m, 0, sizeof(struct ip6_hdr), M_DONTWAIT))) 455 goto bad; 456 ip6 = mtod(m, struct ip6_hdr *); 457 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) { 458 IP6_STATINC(IP6_STAT_BADSCOPE); /* XXX */ 459 goto bad; 460 } 461 if (in6_setscope(&ip6->ip6_src, m->m_pkthdr.rcvif, NULL) || 462 in6_setscope(&ip6->ip6_dst, m->m_pkthdr.rcvif, NULL)) { 463 IP6_STATINC(IP6_STAT_BADSCOPE); 464 goto bad; 465 } 466 467 /* 468 * Multicast check 469 */ 470 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 471 struct in6_multi *in6m = 0; 472 473 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast); 474 /* 475 * See if we belong to the destination multicast group on the 476 * arrival interface. 477 */ 478 IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m); 479 if (in6m) 480 ours = 1; 481 else if (!ip6_mrouter) { 482 uint64_t *ip6s = IP6_STAT_GETREF(); 483 ip6s[IP6_STAT_NOTMEMBER]++; 484 ip6s[IP6_STAT_CANTFORWARD]++; 485 IP6_STAT_PUTREF(); 486 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 487 goto bad; 488 } 489 deliverifp = m->m_pkthdr.rcvif; 490 goto hbhcheck; 491 } 492 493 sockaddr_in6_init(&u.dst6, &ip6->ip6_dst, 0, 0, 0); 494 495 /* 496 * Unicast check 497 */ 498 rt = rtcache_lookup2(&ip6_forward_rt, &u.dst, 1, &hit); 499 if (hit) 500 IP6_STATINC(IP6_STAT_FORWARD_CACHEHIT); 501 else 502 IP6_STATINC(IP6_STAT_FORWARD_CACHEMISS); 503 504 #define rt6_getkey(__rt) satocsin6(rt_getkey(__rt)) 505 506 /* 507 * Accept the packet if the forwarding interface to the destination 508 * according to the routing table is the loopback interface, 509 * unless the associated route has a gateway. 510 * Note that this approach causes to accept a packet if there is a 511 * route to the loopback interface for the destination of the packet. 512 * But we think it's even useful in some situations, e.g. when using 513 * a special daemon which wants to intercept the packet. 514 */ 515 if (rt != NULL && 516 (rt->rt_flags & (RTF_HOST|RTF_GATEWAY)) == RTF_HOST && 517 !(rt->rt_flags & RTF_CLONED) && 518 #if 0 519 /* 520 * The check below is redundant since the comparison of 521 * the destination and the key of the rtentry has 522 * already done through looking up the routing table. 523 */ 524 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &rt6_getkey(rt)->sin6_addr) && 525 #endif 526 rt->rt_ifp->if_type == IFT_LOOP) { 527 struct in6_ifaddr *ia6 = (struct in6_ifaddr *)rt->rt_ifa; 528 if (ia6->ia6_flags & IN6_IFF_ANYCAST) 529 m->m_flags |= M_ANYCAST6; 530 /* 531 * packets to a tentative, duplicated, or somehow invalid 532 * address must not be accepted. 533 */ 534 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) { 535 /* this address is ready */ 536 ours = 1; 537 deliverifp = ia6->ia_ifp; /* correct? */ 538 goto hbhcheck; 539 } else { 540 /* address is not ready, so discard the packet. */ 541 nd6log((LOG_INFO, 542 "ip6_input: packet to an unready address %s->%s\n", 543 ip6_sprintf(&ip6->ip6_src), 544 ip6_sprintf(&ip6->ip6_dst))); 545 546 goto bad; 547 } 548 } 549 550 /* 551 * FAITH (Firewall Aided Internet Translator) 552 */ 553 #if defined(NFAITH) && 0 < NFAITH 554 if (ip6_keepfaith) { 555 if (rt != NULL && rt->rt_ifp != NULL && 556 rt->rt_ifp->if_type == IFT_FAITH) { 557 /* XXX do we need more sanity checks? */ 558 ours = 1; 559 deliverifp = rt->rt_ifp; /* faith */ 560 goto hbhcheck; 561 } 562 } 563 #endif 564 565 #if 0 566 { 567 /* 568 * Last resort: check in6_ifaddr for incoming interface. 569 * The code is here until I update the "goto ours hack" code above 570 * working right. 571 */ 572 struct ifaddr *ifa; 573 IFADDR_FOREACH(ifa, m->m_pkthdr.rcvif) { 574 if (ifa->ifa_addr == NULL) 575 continue; /* just for safety */ 576 if (ifa->ifa_addr->sa_family != AF_INET6) 577 continue; 578 if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) { 579 ours = 1; 580 deliverifp = ifa->ifa_ifp; 581 goto hbhcheck; 582 } 583 } 584 } 585 #endif 586 587 /* 588 * Now there is no reason to process the packet if it's not our own 589 * and we're not a router. 590 */ 591 if (!ip6_forwarding) { 592 IP6_STATINC(IP6_STAT_CANTFORWARD); 593 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 594 goto bad; 595 } 596 597 hbhcheck: 598 /* 599 * record address information into m_tag, if we don't have one yet. 600 * note that we are unable to record it, if the address is not listed 601 * as our interface address (e.g. multicast addresses, addresses 602 * within FAITH prefixes and such). 603 */ 604 if (deliverifp && ip6_getdstifaddr(m) == NULL) { 605 struct in6_ifaddr *ia6; 606 607 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 608 if (ia6 != NULL && ip6_setdstifaddr(m, ia6) == NULL) { 609 /* 610 * XXX maybe we should drop the packet here, 611 * as we could not provide enough information 612 * to the upper layers. 613 */ 614 } 615 } 616 617 /* 618 * Process Hop-by-Hop options header if it's contained. 619 * m may be modified in ip6_hopopts_input(). 620 * If a JumboPayload option is included, plen will also be modified. 621 */ 622 plen = (u_int32_t)ntohs(ip6->ip6_plen); 623 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 624 struct ip6_hbh *hbh; 625 626 if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) { 627 #if 0 /*touches NULL pointer*/ 628 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 629 #endif 630 return; /* m have already been freed */ 631 } 632 633 /* adjust pointer */ 634 ip6 = mtod(m, struct ip6_hdr *); 635 636 /* 637 * if the payload length field is 0 and the next header field 638 * indicates Hop-by-Hop Options header, then a Jumbo Payload 639 * option MUST be included. 640 */ 641 if (ip6->ip6_plen == 0 && plen == 0) { 642 /* 643 * Note that if a valid jumbo payload option is 644 * contained, ip6_hopopts_input() must set a valid 645 * (non-zero) payload length to the variable plen. 646 */ 647 IP6_STATINC(IP6_STAT_BADOPTIONS); 648 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 649 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 650 icmp6_error(m, ICMP6_PARAM_PROB, 651 ICMP6_PARAMPROB_HEADER, 652 (char *)&ip6->ip6_plen - (char *)ip6); 653 return; 654 } 655 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 656 sizeof(struct ip6_hbh)); 657 if (hbh == NULL) { 658 IP6_STATINC(IP6_STAT_TOOSHORT); 659 return; 660 } 661 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 662 nxt = hbh->ip6h_nxt; 663 664 /* 665 * accept the packet if a router alert option is included 666 * and we act as an IPv6 router. 667 */ 668 if (rtalert != ~0 && ip6_forwarding) 669 ours = 1; 670 } else 671 nxt = ip6->ip6_nxt; 672 673 /* 674 * Check that the amount of data in the buffers 675 * is as at least much as the IPv6 header would have us expect. 676 * Trim mbufs if longer than we expect. 677 * Drop packet if shorter than we expect. 678 */ 679 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 680 IP6_STATINC(IP6_STAT_TOOSHORT); 681 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 682 goto bad; 683 } 684 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 685 if (m->m_len == m->m_pkthdr.len) { 686 m->m_len = sizeof(struct ip6_hdr) + plen; 687 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 688 } else 689 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 690 } 691 692 /* 693 * Forward if desirable. 694 */ 695 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 696 /* 697 * If we are acting as a multicast router, all 698 * incoming multicast packets are passed to the 699 * kernel-level multicast forwarding function. 700 * The packet is returned (relatively) intact; if 701 * ip6_mforward() returns a non-zero value, the packet 702 * must be discarded, else it may be accepted below. 703 */ 704 if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) { 705 IP6_STATINC(IP6_STAT_CANTFORWARD); 706 m_freem(m); 707 return; 708 } 709 if (!ours) { 710 m_freem(m); 711 return; 712 } 713 } else if (!ours) { 714 ip6_forward(m, srcrt); 715 return; 716 } 717 718 ip6 = mtod(m, struct ip6_hdr *); 719 720 /* 721 * Malicious party may be able to use IPv4 mapped addr to confuse 722 * tcp/udp stack and bypass security checks (act as if it was from 723 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious. 724 * 725 * For SIIT end node behavior, you may want to disable the check. 726 * However, you will become vulnerable to attacks using IPv4 mapped 727 * source. 728 */ 729 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 730 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 731 IP6_STATINC(IP6_STAT_BADSCOPE); 732 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 733 goto bad; 734 } 735 736 /* 737 * Tell launch routine the next header 738 */ 739 #ifdef IFA_STATS 740 if (deliverifp != NULL) { 741 struct in6_ifaddr *ia6; 742 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 743 if (ia6) 744 ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len; 745 } 746 #endif 747 IP6_STATINC(IP6_STAT_DELIVERED); 748 in6_ifstat_inc(deliverifp, ifs6_in_deliver); 749 nest = 0; 750 751 rh_present = 0; 752 while (nxt != IPPROTO_DONE) { 753 if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) { 754 IP6_STATINC(IP6_STAT_TOOMANYHDR); 755 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 756 goto bad; 757 } 758 759 /* 760 * protection against faulty packet - there should be 761 * more sanity checks in header chain processing. 762 */ 763 if (m->m_pkthdr.len < off) { 764 IP6_STATINC(IP6_STAT_TOOSHORT); 765 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 766 goto bad; 767 } 768 769 if (nxt == IPPROTO_ROUTING) { 770 if (rh_present++) { 771 in6_ifstat_inc(m->m_pkthdr.rcvif, 772 ifs6_in_hdrerr); 773 IP6_STATINC(IP6_STAT_BADOPTIONS); 774 goto bad; 775 } 776 } 777 778 #ifdef IPSEC 779 /* 780 * enforce IPsec policy checking if we are seeing last header. 781 * note that we do not visit this with protocols with pcb layer 782 * code - like udp/tcp/raw ip. 783 */ 784 if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 && 785 ipsec6_in_reject(m, NULL)) { 786 IPSEC6_STATINC(IPSEC_STAT_IN_POLVIO); 787 goto bad; 788 } 789 #endif 790 #ifdef FAST_IPSEC 791 /* 792 * enforce IPsec policy checking if we are seeing last header. 793 * note that we do not visit this with protocols with pcb layer 794 * code - like udp/tcp/raw ip. 795 */ 796 if ((inet6sw[ip_protox[nxt]].pr_flags & PR_LASTHDR) != 0) { 797 /* 798 * Check if the packet has already had IPsec processing 799 * done. If so, then just pass it along. This tag gets 800 * set during AH, ESP, etc. input handling, before the 801 * packet is returned to the ip input queue for delivery. 802 */ 803 mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL); 804 s = splsoftnet(); 805 if (mtag != NULL) { 806 tdbi = (struct tdb_ident *)(mtag + 1); 807 sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND); 808 } else { 809 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, 810 IP_FORWARDING, &error); 811 } 812 if (sp != NULL) { 813 /* 814 * Check security policy against packet attributes. 815 */ 816 error = ipsec_in_reject(sp, m); 817 KEY_FREESP(&sp); 818 } else { 819 /* XXX error stat??? */ 820 error = EINVAL; 821 DPRINTF(("ip6_input: no SP, packet discarded\n"));/*XXX*/ 822 } 823 splx(s); 824 if (error) 825 goto bad; 826 } 827 #endif /* FAST_IPSEC */ 828 829 830 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt); 831 } 832 return; 833 bad: 834 m_freem(m); 835 } 836 837 /* 838 * set/grab in6_ifaddr correspond to IPv6 destination address. 839 */ 840 static struct m_tag * 841 ip6_setdstifaddr(struct mbuf *m, const struct in6_ifaddr *ia) 842 { 843 struct m_tag *mtag; 844 845 mtag = ip6_addaux(m); 846 if (mtag != NULL) { 847 struct ip6aux *ip6a; 848 849 ip6a = (struct ip6aux *)(mtag + 1); 850 in6_setscope(&ip6a->ip6a_src, ia->ia_ifp, &ip6a->ip6a_scope_id); 851 ip6a->ip6a_src = ia->ia_addr.sin6_addr; 852 ip6a->ip6a_flags = ia->ia6_flags; 853 } 854 return mtag; /* NULL if failed to set */ 855 } 856 857 const struct ip6aux * 858 ip6_getdstifaddr(struct mbuf *m) 859 { 860 struct m_tag *mtag; 861 862 mtag = ip6_findaux(m); 863 if (mtag != NULL) 864 return (struct ip6aux *)(mtag + 1); 865 else 866 return NULL; 867 } 868 869 /* 870 * Hop-by-Hop options header processing. If a valid jumbo payload option is 871 * included, the real payload length will be stored in plenp. 872 * 873 * rtalertp - XXX: should be stored more smart way 874 */ 875 static int 876 ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp, 877 struct mbuf **mp, int *offp) 878 { 879 struct mbuf *m = *mp; 880 int off = *offp, hbhlen; 881 struct ip6_hbh *hbh; 882 883 /* validation of the length of the header */ 884 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, 885 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh)); 886 if (hbh == NULL) { 887 IP6_STATINC(IP6_STAT_TOOSHORT); 888 return -1; 889 } 890 hbhlen = (hbh->ip6h_len + 1) << 3; 891 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 892 hbhlen); 893 if (hbh == NULL) { 894 IP6_STATINC(IP6_STAT_TOOSHORT); 895 return -1; 896 } 897 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 898 off += hbhlen; 899 hbhlen -= sizeof(struct ip6_hbh); 900 901 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 902 hbhlen, rtalertp, plenp) < 0) 903 return (-1); 904 905 *offp = off; 906 *mp = m; 907 return (0); 908 } 909 910 /* 911 * Search header for all Hop-by-hop options and process each option. 912 * This function is separate from ip6_hopopts_input() in order to 913 * handle a case where the sending node itself process its hop-by-hop 914 * options header. In such a case, the function is called from ip6_output(). 915 * 916 * The function assumes that hbh header is located right after the IPv6 header 917 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to 918 * opthead + hbhlen is located in continuous memory region. 919 */ 920 int 921 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen, 922 u_int32_t *rtalertp, u_int32_t *plenp) 923 { 924 struct ip6_hdr *ip6; 925 int optlen = 0; 926 u_int8_t *opt = opthead; 927 u_int16_t rtalert_val; 928 u_int32_t jumboplen; 929 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh); 930 931 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 932 switch (*opt) { 933 case IP6OPT_PAD1: 934 optlen = 1; 935 break; 936 case IP6OPT_PADN: 937 if (hbhlen < IP6OPT_MINLEN) { 938 IP6_STATINC(IP6_STAT_TOOSMALL); 939 goto bad; 940 } 941 optlen = *(opt + 1) + 2; 942 break; 943 case IP6OPT_RTALERT: 944 /* XXX may need check for alignment */ 945 if (hbhlen < IP6OPT_RTALERT_LEN) { 946 IP6_STATINC(IP6_STAT_TOOSMALL); 947 goto bad; 948 } 949 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) { 950 /* XXX stat */ 951 icmp6_error(m, ICMP6_PARAM_PROB, 952 ICMP6_PARAMPROB_HEADER, 953 erroff + opt + 1 - opthead); 954 return (-1); 955 } 956 optlen = IP6OPT_RTALERT_LEN; 957 bcopy((void *)(opt + 2), (void *)&rtalert_val, 2); 958 *rtalertp = ntohs(rtalert_val); 959 break; 960 case IP6OPT_JUMBO: 961 /* XXX may need check for alignment */ 962 if (hbhlen < IP6OPT_JUMBO_LEN) { 963 IP6_STATINC(IP6_STAT_TOOSMALL); 964 goto bad; 965 } 966 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) { 967 /* XXX stat */ 968 icmp6_error(m, ICMP6_PARAM_PROB, 969 ICMP6_PARAMPROB_HEADER, 970 erroff + opt + 1 - opthead); 971 return (-1); 972 } 973 optlen = IP6OPT_JUMBO_LEN; 974 975 /* 976 * IPv6 packets that have non 0 payload length 977 * must not contain a jumbo payload option. 978 */ 979 ip6 = mtod(m, struct ip6_hdr *); 980 if (ip6->ip6_plen) { 981 IP6_STATINC(IP6_STAT_BADOPTIONS); 982 icmp6_error(m, ICMP6_PARAM_PROB, 983 ICMP6_PARAMPROB_HEADER, 984 erroff + opt - opthead); 985 return (-1); 986 } 987 988 /* 989 * We may see jumbolen in unaligned location, so 990 * we'd need to perform bcopy(). 991 */ 992 bcopy(opt + 2, &jumboplen, sizeof(jumboplen)); 993 jumboplen = (u_int32_t)htonl(jumboplen); 994 995 #if 1 996 /* 997 * if there are multiple jumbo payload options, 998 * *plenp will be non-zero and the packet will be 999 * rejected. 1000 * the behavior may need some debate in ipngwg - 1001 * multiple options does not make sense, however, 1002 * there's no explicit mention in specification. 1003 */ 1004 if (*plenp != 0) { 1005 IP6_STATINC(IP6_STAT_BADOPTIONS); 1006 icmp6_error(m, ICMP6_PARAM_PROB, 1007 ICMP6_PARAMPROB_HEADER, 1008 erroff + opt + 2 - opthead); 1009 return (-1); 1010 } 1011 #endif 1012 1013 /* 1014 * jumbo payload length must be larger than 65535. 1015 */ 1016 if (jumboplen <= IPV6_MAXPACKET) { 1017 IP6_STATINC(IP6_STAT_BADOPTIONS); 1018 icmp6_error(m, ICMP6_PARAM_PROB, 1019 ICMP6_PARAMPROB_HEADER, 1020 erroff + opt + 2 - opthead); 1021 return (-1); 1022 } 1023 *plenp = jumboplen; 1024 1025 break; 1026 default: /* unknown option */ 1027 if (hbhlen < IP6OPT_MINLEN) { 1028 IP6_STATINC(IP6_STAT_TOOSMALL); 1029 goto bad; 1030 } 1031 optlen = ip6_unknown_opt(opt, m, 1032 erroff + opt - opthead); 1033 if (optlen == -1) 1034 return (-1); 1035 optlen += 2; 1036 break; 1037 } 1038 } 1039 1040 return (0); 1041 1042 bad: 1043 m_freem(m); 1044 return (-1); 1045 } 1046 1047 /* 1048 * Unknown option processing. 1049 * The third argument `off' is the offset from the IPv6 header to the option, 1050 * which is necessary if the IPv6 header the and option header and IPv6 header 1051 * is not continuous in order to return an ICMPv6 error. 1052 */ 1053 int 1054 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off) 1055 { 1056 struct ip6_hdr *ip6; 1057 1058 switch (IP6OPT_TYPE(*optp)) { 1059 case IP6OPT_TYPE_SKIP: /* ignore the option */ 1060 return ((int)*(optp + 1)); 1061 case IP6OPT_TYPE_DISCARD: /* silently discard */ 1062 m_freem(m); 1063 return (-1); 1064 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 1065 IP6_STATINC(IP6_STAT_BADOPTIONS); 1066 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 1067 return (-1); 1068 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 1069 IP6_STATINC(IP6_STAT_BADOPTIONS); 1070 ip6 = mtod(m, struct ip6_hdr *); 1071 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 1072 (m->m_flags & (M_BCAST|M_MCAST))) 1073 m_freem(m); 1074 else 1075 icmp6_error(m, ICMP6_PARAM_PROB, 1076 ICMP6_PARAMPROB_OPTION, off); 1077 return (-1); 1078 } 1079 1080 m_freem(m); /* XXX: NOTREACHED */ 1081 return (-1); 1082 } 1083 1084 /* 1085 * Create the "control" list for this pcb. 1086 * 1087 * The routine will be called from upper layer handlers like tcp6_input(). 1088 * Thus the routine assumes that the caller (tcp6_input) have already 1089 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the 1090 * very first mbuf on the mbuf chain. 1091 * We may want to add some infinite loop prevention or sanity checks for safety. 1092 * (This applies only when you are using KAME mbuf chain restriction, i.e. 1093 * you are using IP6_EXTHDR_CHECK() not m_pulldown()) 1094 */ 1095 void 1096 ip6_savecontrol(struct in6pcb *in6p, struct mbuf **mp, 1097 struct ip6_hdr *ip6, struct mbuf *m) 1098 { 1099 #ifdef RFC2292 1100 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y)) 1101 #else 1102 #define IS2292(x, y) (y) 1103 #endif 1104 1105 #ifdef SO_TIMESTAMP 1106 if (in6p->in6p_socket->so_options & SO_TIMESTAMP) { 1107 struct timeval tv; 1108 1109 microtime(&tv); 1110 *mp = sbcreatecontrol((void *) &tv, sizeof(tv), 1111 SCM_TIMESTAMP, SOL_SOCKET); 1112 if (*mp) 1113 mp = &(*mp)->m_next; 1114 } 1115 #endif 1116 1117 /* some OSes call this logic with IPv4 packet, for SO_TIMESTAMP */ 1118 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) 1119 return; 1120 1121 /* RFC 2292 sec. 5 */ 1122 if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) { 1123 struct in6_pktinfo pi6; 1124 1125 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr)); 1126 in6_clearscope(&pi6.ipi6_addr); /* XXX */ 1127 pi6.ipi6_ifindex = m->m_pkthdr.rcvif ? 1128 m->m_pkthdr.rcvif->if_index : 0; 1129 *mp = sbcreatecontrol((void *) &pi6, 1130 sizeof(struct in6_pktinfo), 1131 IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6); 1132 if (*mp) 1133 mp = &(*mp)->m_next; 1134 } 1135 1136 if (in6p->in6p_flags & IN6P_HOPLIMIT) { 1137 int hlim = ip6->ip6_hlim & 0xff; 1138 1139 *mp = sbcreatecontrol((void *) &hlim, sizeof(int), 1140 IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6); 1141 if (*mp) 1142 mp = &(*mp)->m_next; 1143 } 1144 1145 if ((in6p->in6p_flags & IN6P_TCLASS) != 0) { 1146 u_int32_t flowinfo; 1147 int tclass; 1148 1149 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK); 1150 flowinfo >>= 20; 1151 1152 tclass = flowinfo & 0xff; 1153 *mp = sbcreatecontrol((void *)&tclass, sizeof(tclass), 1154 IPV6_TCLASS, IPPROTO_IPV6); 1155 1156 if (*mp) 1157 mp = &(*mp)->m_next; 1158 } 1159 1160 /* 1161 * IPV6_HOPOPTS socket option. Recall that we required super-user 1162 * privilege for the option (see ip6_ctloutput), but it might be too 1163 * strict, since there might be some hop-by-hop options which can be 1164 * returned to normal user. 1165 * See also RFC3542 section 8 (or RFC2292 section 6). 1166 */ 1167 if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0) { 1168 /* 1169 * Check if a hop-by-hop options header is contatined in the 1170 * received packet, and if so, store the options as ancillary 1171 * data. Note that a hop-by-hop options header must be 1172 * just after the IPv6 header, which fact is assured through 1173 * the IPv6 input processing. 1174 */ 1175 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1176 if (xip6->ip6_nxt == IPPROTO_HOPOPTS) { 1177 struct ip6_hbh *hbh; 1178 int hbhlen; 1179 struct mbuf *ext; 1180 1181 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr), 1182 xip6->ip6_nxt); 1183 if (ext == NULL) { 1184 IP6_STATINC(IP6_STAT_TOOSHORT); 1185 return; 1186 } 1187 hbh = mtod(ext, struct ip6_hbh *); 1188 hbhlen = (hbh->ip6h_len + 1) << 3; 1189 if (hbhlen != ext->m_len) { 1190 m_freem(ext); 1191 IP6_STATINC(IP6_STAT_TOOSHORT); 1192 return; 1193 } 1194 1195 /* 1196 * XXX: We copy whole the header even if a jumbo 1197 * payload option is included, which option is to 1198 * be removed before returning in the RFC 2292. 1199 * Note: this constraint is removed in RFC3542. 1200 */ 1201 *mp = sbcreatecontrol((void *)hbh, hbhlen, 1202 IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS), 1203 IPPROTO_IPV6); 1204 if (*mp) 1205 mp = &(*mp)->m_next; 1206 m_freem(ext); 1207 } 1208 } 1209 1210 /* IPV6_DSTOPTS and IPV6_RTHDR socket options */ 1211 if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) { 1212 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1213 int nxt = xip6->ip6_nxt, off = sizeof(struct ip6_hdr); 1214 1215 /* 1216 * Search for destination options headers or routing 1217 * header(s) through the header chain, and stores each 1218 * header as ancillary data. 1219 * Note that the order of the headers remains in 1220 * the chain of ancillary data. 1221 */ 1222 for (;;) { /* is explicit loop prevention necessary? */ 1223 struct ip6_ext *ip6e = NULL; 1224 int elen; 1225 struct mbuf *ext = NULL; 1226 1227 /* 1228 * if it is not an extension header, don't try to 1229 * pull it from the chain. 1230 */ 1231 switch (nxt) { 1232 case IPPROTO_DSTOPTS: 1233 case IPPROTO_ROUTING: 1234 case IPPROTO_HOPOPTS: 1235 case IPPROTO_AH: /* is it possible? */ 1236 break; 1237 default: 1238 goto loopend; 1239 } 1240 1241 ext = ip6_pullexthdr(m, off, nxt); 1242 if (ext == NULL) { 1243 IP6_STATINC(IP6_STAT_TOOSHORT); 1244 return; 1245 } 1246 ip6e = mtod(ext, struct ip6_ext *); 1247 if (nxt == IPPROTO_AH) 1248 elen = (ip6e->ip6e_len + 2) << 2; 1249 else 1250 elen = (ip6e->ip6e_len + 1) << 3; 1251 if (elen != ext->m_len) { 1252 m_freem(ext); 1253 IP6_STATINC(IP6_STAT_TOOSHORT); 1254 return; 1255 } 1256 KASSERT(IP6_HDR_ALIGNED_P(ip6e)); 1257 1258 switch (nxt) { 1259 case IPPROTO_DSTOPTS: 1260 if (!in6p->in6p_flags & IN6P_DSTOPTS) 1261 break; 1262 1263 *mp = sbcreatecontrol((void *)ip6e, elen, 1264 IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS), 1265 IPPROTO_IPV6); 1266 if (*mp) 1267 mp = &(*mp)->m_next; 1268 break; 1269 1270 case IPPROTO_ROUTING: 1271 if (!in6p->in6p_flags & IN6P_RTHDR) 1272 break; 1273 1274 *mp = sbcreatecontrol((void *)ip6e, elen, 1275 IS2292(IPV6_2292RTHDR, IPV6_RTHDR), 1276 IPPROTO_IPV6); 1277 if (*mp) 1278 mp = &(*mp)->m_next; 1279 break; 1280 1281 case IPPROTO_HOPOPTS: 1282 case IPPROTO_AH: /* is it possible? */ 1283 break; 1284 1285 default: 1286 /* 1287 * other cases have been filtered in the above. 1288 * none will visit this case. here we supply 1289 * the code just in case (nxt overwritten or 1290 * other cases). 1291 */ 1292 m_freem(ext); 1293 goto loopend; 1294 1295 } 1296 1297 /* proceed with the next header. */ 1298 off += elen; 1299 nxt = ip6e->ip6e_nxt; 1300 ip6e = NULL; 1301 m_freem(ext); 1302 ext = NULL; 1303 } 1304 loopend: 1305 ; 1306 } 1307 } 1308 #undef IS2292 1309 1310 1311 void 1312 ip6_notify_pmtu(struct in6pcb *in6p, const struct sockaddr_in6 *dst, 1313 uint32_t *mtu) 1314 { 1315 struct socket *so; 1316 struct mbuf *m_mtu; 1317 struct ip6_mtuinfo mtuctl; 1318 1319 so = in6p->in6p_socket; 1320 1321 if (mtu == NULL) 1322 return; 1323 1324 #ifdef DIAGNOSTIC 1325 if (so == NULL) /* I believe this is impossible */ 1326 panic("ip6_notify_pmtu: socket is NULL"); 1327 #endif 1328 1329 memset(&mtuctl, 0, sizeof(mtuctl)); /* zero-clear for safety */ 1330 mtuctl.ip6m_mtu = *mtu; 1331 mtuctl.ip6m_addr = *dst; 1332 if (sa6_recoverscope(&mtuctl.ip6m_addr)) 1333 return; 1334 1335 if ((m_mtu = sbcreatecontrol((void *)&mtuctl, sizeof(mtuctl), 1336 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL) 1337 return; 1338 1339 if (sbappendaddr(&so->so_rcv, (const struct sockaddr *)dst, NULL, m_mtu) 1340 == 0) { 1341 m_freem(m_mtu); 1342 /* XXX: should count statistics */ 1343 } else 1344 sorwakeup(so); 1345 1346 return; 1347 } 1348 1349 /* 1350 * pull single extension header from mbuf chain. returns single mbuf that 1351 * contains the result, or NULL on error. 1352 */ 1353 static struct mbuf * 1354 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt) 1355 { 1356 struct ip6_ext ip6e; 1357 size_t elen; 1358 struct mbuf *n; 1359 1360 #ifdef DIAGNOSTIC 1361 switch (nxt) { 1362 case IPPROTO_DSTOPTS: 1363 case IPPROTO_ROUTING: 1364 case IPPROTO_HOPOPTS: 1365 case IPPROTO_AH: /* is it possible? */ 1366 break; 1367 default: 1368 printf("ip6_pullexthdr: invalid nxt=%d\n", nxt); 1369 } 1370 #endif 1371 1372 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1373 if (nxt == IPPROTO_AH) 1374 elen = (ip6e.ip6e_len + 2) << 2; 1375 else 1376 elen = (ip6e.ip6e_len + 1) << 3; 1377 1378 MGET(n, M_DONTWAIT, MT_DATA); 1379 if (n && elen >= MLEN) { 1380 MCLGET(n, M_DONTWAIT); 1381 if ((n->m_flags & M_EXT) == 0) { 1382 m_free(n); 1383 n = NULL; 1384 } 1385 } 1386 if (!n) 1387 return NULL; 1388 1389 n->m_len = 0; 1390 if (elen >= M_TRAILINGSPACE(n)) { 1391 m_free(n); 1392 return NULL; 1393 } 1394 1395 m_copydata(m, off, elen, mtod(n, void *)); 1396 n->m_len = elen; 1397 return n; 1398 } 1399 1400 /* 1401 * Get pointer to the previous header followed by the header 1402 * currently processed. 1403 * XXX: This function supposes that 1404 * M includes all headers, 1405 * the next header field and the header length field of each header 1406 * are valid, and 1407 * the sum of each header length equals to OFF. 1408 * Because of these assumptions, this function must be called very 1409 * carefully. Moreover, it will not be used in the near future when 1410 * we develop `neater' mechanism to process extension headers. 1411 */ 1412 u_int8_t * 1413 ip6_get_prevhdr(struct mbuf *m, int off) 1414 { 1415 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1416 1417 if (off == sizeof(struct ip6_hdr)) 1418 return (&ip6->ip6_nxt); 1419 else { 1420 int len, nxt; 1421 struct ip6_ext *ip6e = NULL; 1422 1423 nxt = ip6->ip6_nxt; 1424 len = sizeof(struct ip6_hdr); 1425 while (len < off) { 1426 ip6e = (struct ip6_ext *)(mtod(m, char *) + len); 1427 1428 switch (nxt) { 1429 case IPPROTO_FRAGMENT: 1430 len += sizeof(struct ip6_frag); 1431 break; 1432 case IPPROTO_AH: 1433 len += (ip6e->ip6e_len + 2) << 2; 1434 break; 1435 default: 1436 len += (ip6e->ip6e_len + 1) << 3; 1437 break; 1438 } 1439 nxt = ip6e->ip6e_nxt; 1440 } 1441 if (ip6e) 1442 return (&ip6e->ip6e_nxt); 1443 else 1444 return NULL; 1445 } 1446 } 1447 1448 /* 1449 * get next header offset. m will be retained. 1450 */ 1451 int 1452 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp) 1453 { 1454 struct ip6_hdr ip6; 1455 struct ip6_ext ip6e; 1456 struct ip6_frag fh; 1457 1458 /* just in case */ 1459 if (m == NULL) 1460 panic("ip6_nexthdr: m == NULL"); 1461 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off) 1462 return -1; 1463 1464 switch (proto) { 1465 case IPPROTO_IPV6: 1466 /* do not chase beyond intermediate IPv6 headers */ 1467 if (off != 0) 1468 return -1; 1469 if (m->m_pkthdr.len < off + sizeof(ip6)) 1470 return -1; 1471 m_copydata(m, off, sizeof(ip6), (void *)&ip6); 1472 if (nxtp) 1473 *nxtp = ip6.ip6_nxt; 1474 off += sizeof(ip6); 1475 return off; 1476 1477 case IPPROTO_FRAGMENT: 1478 /* 1479 * terminate parsing if it is not the first fragment, 1480 * it does not make sense to parse through it. 1481 */ 1482 if (m->m_pkthdr.len < off + sizeof(fh)) 1483 return -1; 1484 m_copydata(m, off, sizeof(fh), (void *)&fh); 1485 if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0) 1486 return -1; 1487 if (nxtp) 1488 *nxtp = fh.ip6f_nxt; 1489 off += sizeof(struct ip6_frag); 1490 return off; 1491 1492 case IPPROTO_AH: 1493 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1494 return -1; 1495 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1496 if (nxtp) 1497 *nxtp = ip6e.ip6e_nxt; 1498 off += (ip6e.ip6e_len + 2) << 2; 1499 if (m->m_pkthdr.len < off) 1500 return -1; 1501 return off; 1502 1503 case IPPROTO_HOPOPTS: 1504 case IPPROTO_ROUTING: 1505 case IPPROTO_DSTOPTS: 1506 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1507 return -1; 1508 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1509 if (nxtp) 1510 *nxtp = ip6e.ip6e_nxt; 1511 off += (ip6e.ip6e_len + 1) << 3; 1512 if (m->m_pkthdr.len < off) 1513 return -1; 1514 return off; 1515 1516 case IPPROTO_NONE: 1517 case IPPROTO_ESP: 1518 case IPPROTO_IPCOMP: 1519 /* give up */ 1520 return -1; 1521 1522 default: 1523 return -1; 1524 } 1525 } 1526 1527 /* 1528 * get offset for the last header in the chain. m will be kept untainted. 1529 */ 1530 int 1531 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp) 1532 { 1533 int newoff; 1534 int nxt; 1535 1536 if (!nxtp) { 1537 nxt = -1; 1538 nxtp = &nxt; 1539 } 1540 for (;;) { 1541 newoff = ip6_nexthdr(m, off, proto, nxtp); 1542 if (newoff < 0) 1543 return off; 1544 else if (newoff < off) 1545 return -1; /* invalid */ 1546 else if (newoff == off) 1547 return newoff; 1548 1549 off = newoff; 1550 proto = *nxtp; 1551 } 1552 } 1553 1554 struct m_tag * 1555 ip6_addaux(struct mbuf *m) 1556 { 1557 struct m_tag *mtag; 1558 1559 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1560 if (!mtag) { 1561 mtag = m_tag_get(PACKET_TAG_INET6, sizeof(struct ip6aux), 1562 M_NOWAIT); 1563 if (mtag) { 1564 m_tag_prepend(m, mtag); 1565 bzero(mtag + 1, sizeof(struct ip6aux)); 1566 } 1567 } 1568 return mtag; 1569 } 1570 1571 struct m_tag * 1572 ip6_findaux(struct mbuf *m) 1573 { 1574 struct m_tag *mtag; 1575 1576 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1577 return mtag; 1578 } 1579 1580 void 1581 ip6_delaux(struct mbuf *m) 1582 { 1583 struct m_tag *mtag; 1584 1585 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1586 if (mtag) 1587 m_tag_delete(m, mtag); 1588 } 1589 1590 #ifdef GATEWAY 1591 /* 1592 * sysctl helper routine for net.inet.ip6.maxflows. Since 1593 * we could reduce this value, call ip6flow_reap(); 1594 */ 1595 static int 1596 sysctl_net_inet6_ip6_maxflows(SYSCTLFN_ARGS) 1597 { 1598 int s; 1599 1600 s = sysctl_lookup(SYSCTLFN_CALL(rnode)); 1601 if (s || newp == NULL) 1602 return (s); 1603 1604 s = splsoftnet(); 1605 ip6flow_reap(0); 1606 splx(s); 1607 1608 return (0); 1609 } 1610 1611 static int 1612 sysctl_net_inet6_ip6_hashsize(SYSCTLFN_ARGS) 1613 { 1614 int error, tmp; 1615 struct sysctlnode node; 1616 1617 node = *rnode; 1618 tmp = ip6_hashsize; 1619 node.sysctl_data = &tmp; 1620 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 1621 if (error || newp == NULL) 1622 return (error); 1623 1624 if ((tmp & (tmp - 1)) == 0 && tmp != 0) { 1625 /* 1626 * Can only fail due to malloc() 1627 */ 1628 if (ip6flow_invalidate_all(tmp)) 1629 return ENOMEM; 1630 } else { 1631 /* 1632 * EINVAL if not a power of 2 1633 */ 1634 return EINVAL; 1635 } 1636 1637 return (0); 1638 } 1639 #endif /* GATEWAY */ 1640 1641 /* 1642 * System control for IP6 1643 */ 1644 1645 u_char inet6ctlerrmap[PRC_NCMDS] = { 1646 0, 0, 0, 0, 1647 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 1648 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 1649 EMSGSIZE, EHOSTUNREACH, 0, 0, 1650 0, 0, 0, 0, 1651 ENOPROTOOPT 1652 }; 1653 1654 static int 1655 sysctl_net_inet6_ip6_stats(SYSCTLFN_ARGS) 1656 { 1657 1658 return (NETSTAT_SYSCTL(ip6stat_percpu, IP6_NSTATS)); 1659 } 1660 1661 SYSCTL_SETUP(sysctl_net_inet6_ip6_setup, "sysctl net.inet6.ip6 subtree setup") 1662 { 1663 #ifdef RFC2292 1664 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y)) 1665 #else 1666 #define IS2292(x, y) (y) 1667 #endif 1668 1669 sysctl_createv(clog, 0, NULL, NULL, 1670 CTLFLAG_PERMANENT, 1671 CTLTYPE_NODE, "net", NULL, 1672 NULL, 0, NULL, 0, 1673 CTL_NET, CTL_EOL); 1674 sysctl_createv(clog, 0, NULL, NULL, 1675 CTLFLAG_PERMANENT, 1676 CTLTYPE_NODE, "inet6", 1677 SYSCTL_DESCR("PF_INET6 related settings"), 1678 NULL, 0, NULL, 0, 1679 CTL_NET, PF_INET6, CTL_EOL); 1680 sysctl_createv(clog, 0, NULL, NULL, 1681 CTLFLAG_PERMANENT, 1682 CTLTYPE_NODE, "ip6", 1683 SYSCTL_DESCR("IPv6 related settings"), 1684 NULL, 0, NULL, 0, 1685 CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_EOL); 1686 1687 sysctl_createv(clog, 0, NULL, NULL, 1688 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1689 CTLTYPE_INT, "forwarding", 1690 SYSCTL_DESCR("Enable forwarding of INET6 datagrams"), 1691 NULL, 0, &ip6_forwarding, 0, 1692 CTL_NET, PF_INET6, IPPROTO_IPV6, 1693 IPV6CTL_FORWARDING, CTL_EOL); 1694 sysctl_createv(clog, 0, NULL, NULL, 1695 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1696 CTLTYPE_INT, "redirect", 1697 SYSCTL_DESCR("Enable sending of ICMPv6 redirect messages"), 1698 NULL, 0, &ip6_sendredirects, 0, 1699 CTL_NET, PF_INET6, IPPROTO_IPV6, 1700 IPV6CTL_SENDREDIRECTS, CTL_EOL); 1701 sysctl_createv(clog, 0, NULL, NULL, 1702 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1703 CTLTYPE_INT, "hlim", 1704 SYSCTL_DESCR("Hop limit for an INET6 datagram"), 1705 NULL, 0, &ip6_defhlim, 0, 1706 CTL_NET, PF_INET6, IPPROTO_IPV6, 1707 IPV6CTL_DEFHLIM, CTL_EOL); 1708 #ifdef notyet 1709 sysctl_createv(clog, 0, NULL, NULL, 1710 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1711 CTLTYPE_INT, "mtu", NULL, 1712 NULL, 0, &, 0, 1713 CTL_NET, PF_INET6, IPPROTO_IPV6, 1714 IPV6CTL_DEFMTU, CTL_EOL); 1715 #endif 1716 #ifdef __no_idea__ 1717 sysctl_createv(clog, 0, NULL, NULL, 1718 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1719 CTLTYPE_INT, "forwsrcrt", NULL, 1720 NULL, 0, &?, 0, 1721 CTL_NET, PF_INET6, IPPROTO_IPV6, 1722 IPV6CTL_FORWSRCRT, CTL_EOL); 1723 sysctl_createv(clog, 0, NULL, NULL, 1724 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1725 CTLTYPE_STRUCT, "mrtstats", NULL, 1726 NULL, 0, &?, sizeof(?), 1727 CTL_NET, PF_INET6, IPPROTO_IPV6, 1728 IPV6CTL_MRTSTATS, CTL_EOL); 1729 sysctl_createv(clog, 0, NULL, NULL, 1730 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1731 CTLTYPE_?, "mrtproto", NULL, 1732 NULL, 0, &?, sizeof(?), 1733 CTL_NET, PF_INET6, IPPROTO_IPV6, 1734 IPV6CTL_MRTPROTO, CTL_EOL); 1735 #endif 1736 sysctl_createv(clog, 0, NULL, NULL, 1737 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1738 CTLTYPE_INT, "maxfragpackets", 1739 SYSCTL_DESCR("Maximum number of fragments to buffer " 1740 "for reassembly"), 1741 NULL, 0, &ip6_maxfragpackets, 0, 1742 CTL_NET, PF_INET6, IPPROTO_IPV6, 1743 IPV6CTL_MAXFRAGPACKETS, CTL_EOL); 1744 #ifdef __no_idea__ 1745 sysctl_createv(clog, 0, NULL, NULL, 1746 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1747 CTLTYPE_INT, "sourcecheck", NULL, 1748 NULL, 0, &?, 0, 1749 CTL_NET, PF_INET6, IPPROTO_IPV6, 1750 IPV6CTL_SOURCECHECK, CTL_EOL); 1751 sysctl_createv(clog, 0, NULL, NULL, 1752 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1753 CTLTYPE_INT, "sourcecheck_logint", NULL, 1754 NULL, 0, &?, 0, 1755 CTL_NET, PF_INET6, IPPROTO_IPV6, 1756 IPV6CTL_SOURCECHECK_LOGINT, CTL_EOL); 1757 #endif 1758 sysctl_createv(clog, 0, NULL, NULL, 1759 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1760 CTLTYPE_INT, "accept_rtadv", 1761 SYSCTL_DESCR("Accept router advertisements"), 1762 NULL, 0, &ip6_accept_rtadv, 0, 1763 CTL_NET, PF_INET6, IPPROTO_IPV6, 1764 IPV6CTL_ACCEPT_RTADV, CTL_EOL); 1765 sysctl_createv(clog, 0, NULL, NULL, 1766 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1767 CTLTYPE_INT, "keepfaith", 1768 SYSCTL_DESCR("Activate faith interface"), 1769 NULL, 0, &ip6_keepfaith, 0, 1770 CTL_NET, PF_INET6, IPPROTO_IPV6, 1771 IPV6CTL_KEEPFAITH, CTL_EOL); 1772 sysctl_createv(clog, 0, NULL, NULL, 1773 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1774 CTLTYPE_INT, "log_interval", 1775 SYSCTL_DESCR("Minumum interval between logging " 1776 "unroutable packets"), 1777 NULL, 0, &ip6_log_interval, 0, 1778 CTL_NET, PF_INET6, IPPROTO_IPV6, 1779 IPV6CTL_LOG_INTERVAL, CTL_EOL); 1780 sysctl_createv(clog, 0, NULL, NULL, 1781 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1782 CTLTYPE_INT, "hdrnestlimit", 1783 SYSCTL_DESCR("Maximum number of nested IPv6 headers"), 1784 NULL, 0, &ip6_hdrnestlimit, 0, 1785 CTL_NET, PF_INET6, IPPROTO_IPV6, 1786 IPV6CTL_HDRNESTLIMIT, CTL_EOL); 1787 sysctl_createv(clog, 0, NULL, NULL, 1788 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1789 CTLTYPE_INT, "dad_count", 1790 SYSCTL_DESCR("Number of Duplicate Address Detection " 1791 "probes to send"), 1792 NULL, 0, &ip6_dad_count, 0, 1793 CTL_NET, PF_INET6, IPPROTO_IPV6, 1794 IPV6CTL_DAD_COUNT, CTL_EOL); 1795 sysctl_createv(clog, 0, NULL, NULL, 1796 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1797 CTLTYPE_INT, "auto_flowlabel", 1798 SYSCTL_DESCR("Assign random IPv6 flow labels"), 1799 NULL, 0, &ip6_auto_flowlabel, 0, 1800 CTL_NET, PF_INET6, IPPROTO_IPV6, 1801 IPV6CTL_AUTO_FLOWLABEL, CTL_EOL); 1802 sysctl_createv(clog, 0, NULL, NULL, 1803 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1804 CTLTYPE_INT, "defmcasthlim", 1805 SYSCTL_DESCR("Default multicast hop limit"), 1806 NULL, 0, &ip6_defmcasthlim, 0, 1807 CTL_NET, PF_INET6, IPPROTO_IPV6, 1808 IPV6CTL_DEFMCASTHLIM, CTL_EOL); 1809 #if NGIF > 0 1810 sysctl_createv(clog, 0, NULL, NULL, 1811 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1812 CTLTYPE_INT, "gifhlim", 1813 SYSCTL_DESCR("Default hop limit for a gif tunnel datagram"), 1814 NULL, 0, &ip6_gif_hlim, 0, 1815 CTL_NET, PF_INET6, IPPROTO_IPV6, 1816 IPV6CTL_GIF_HLIM, CTL_EOL); 1817 #endif /* NGIF */ 1818 sysctl_createv(clog, 0, NULL, NULL, 1819 CTLFLAG_PERMANENT, 1820 CTLTYPE_STRING, "kame_version", 1821 SYSCTL_DESCR("KAME Version"), 1822 NULL, 0, __UNCONST(__KAME_VERSION), 0, 1823 CTL_NET, PF_INET6, IPPROTO_IPV6, 1824 IPV6CTL_KAME_VERSION, CTL_EOL); 1825 sysctl_createv(clog, 0, NULL, NULL, 1826 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1827 CTLTYPE_INT, "use_deprecated", 1828 SYSCTL_DESCR("Allow use of deprecated addresses as " 1829 "source addresses"), 1830 NULL, 0, &ip6_use_deprecated, 0, 1831 CTL_NET, PF_INET6, IPPROTO_IPV6, 1832 IPV6CTL_USE_DEPRECATED, CTL_EOL); 1833 sysctl_createv(clog, 0, NULL, NULL, 1834 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1835 CTLTYPE_INT, "rr_prune", NULL, 1836 NULL, 0, &ip6_rr_prune, 0, 1837 CTL_NET, PF_INET6, IPPROTO_IPV6, 1838 IPV6CTL_RR_PRUNE, CTL_EOL); 1839 sysctl_createv(clog, 0, NULL, NULL, 1840 CTLFLAG_PERMANENT 1841 #ifndef INET6_BINDV6ONLY 1842 |CTLFLAG_READWRITE, 1843 #endif 1844 CTLTYPE_INT, "v6only", 1845 SYSCTL_DESCR("Disallow PF_INET6 sockets from connecting " 1846 "to PF_INET sockets"), 1847 NULL, 0, &ip6_v6only, 0, 1848 CTL_NET, PF_INET6, IPPROTO_IPV6, 1849 IPV6CTL_V6ONLY, CTL_EOL); 1850 sysctl_createv(clog, 0, NULL, NULL, 1851 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1852 CTLTYPE_INT, "anonportmin", 1853 SYSCTL_DESCR("Lowest ephemeral port number to assign"), 1854 sysctl_net_inet_ip_ports, 0, &ip6_anonportmin, 0, 1855 CTL_NET, PF_INET6, IPPROTO_IPV6, 1856 IPV6CTL_ANONPORTMIN, CTL_EOL); 1857 sysctl_createv(clog, 0, NULL, NULL, 1858 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1859 CTLTYPE_INT, "anonportmax", 1860 SYSCTL_DESCR("Highest ephemeral port number to assign"), 1861 sysctl_net_inet_ip_ports, 0, &ip6_anonportmax, 0, 1862 CTL_NET, PF_INET6, IPPROTO_IPV6, 1863 IPV6CTL_ANONPORTMAX, CTL_EOL); 1864 #ifndef IPNOPRIVPORTS 1865 sysctl_createv(clog, 0, NULL, NULL, 1866 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1867 CTLTYPE_INT, "lowportmin", 1868 SYSCTL_DESCR("Lowest privileged ephemeral port number " 1869 "to assign"), 1870 sysctl_net_inet_ip_ports, 0, &ip6_lowportmin, 0, 1871 CTL_NET, PF_INET6, IPPROTO_IPV6, 1872 IPV6CTL_LOWPORTMIN, CTL_EOL); 1873 sysctl_createv(clog, 0, NULL, NULL, 1874 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1875 CTLTYPE_INT, "lowportmax", 1876 SYSCTL_DESCR("Highest privileged ephemeral port number " 1877 "to assign"), 1878 sysctl_net_inet_ip_ports, 0, &ip6_lowportmax, 0, 1879 CTL_NET, PF_INET6, IPPROTO_IPV6, 1880 IPV6CTL_LOWPORTMAX, CTL_EOL); 1881 #endif /* IPNOPRIVPORTS */ 1882 sysctl_createv(clog, 0, NULL, NULL, 1883 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1884 CTLTYPE_INT, "use_tempaddr", 1885 SYSCTL_DESCR("Use temporary address"), 1886 NULL, 0, &ip6_use_tempaddr, 0, 1887 CTL_NET, PF_INET6, IPPROTO_IPV6, 1888 CTL_CREATE, CTL_EOL); 1889 sysctl_createv(clog, 0, NULL, NULL, 1890 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1891 CTLTYPE_INT, "temppltime", 1892 SYSCTL_DESCR("preferred lifetime of a temporary address"), 1893 NULL, 0, &ip6_temp_preferred_lifetime, 0, 1894 CTL_NET, PF_INET6, IPPROTO_IPV6, 1895 CTL_CREATE, CTL_EOL); 1896 sysctl_createv(clog, 0, NULL, NULL, 1897 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1898 CTLTYPE_INT, "tempvltime", 1899 SYSCTL_DESCR("valid lifetime of a temporary address"), 1900 NULL, 0, &ip6_temp_valid_lifetime, 0, 1901 CTL_NET, PF_INET6, IPPROTO_IPV6, 1902 CTL_CREATE, CTL_EOL); 1903 sysctl_createv(clog, 0, NULL, NULL, 1904 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1905 CTLTYPE_INT, "maxfrags", 1906 SYSCTL_DESCR("Maximum fragments in reassembly queue"), 1907 NULL, 0, &ip6_maxfrags, 0, 1908 CTL_NET, PF_INET6, IPPROTO_IPV6, 1909 IPV6CTL_MAXFRAGS, CTL_EOL); 1910 sysctl_createv(clog, 0, NULL, NULL, 1911 CTLFLAG_PERMANENT, 1912 CTLTYPE_STRUCT, "stats", 1913 SYSCTL_DESCR("IPv6 statistics"), 1914 sysctl_net_inet6_ip6_stats, 0, NULL, 0, 1915 CTL_NET, PF_INET6, IPPROTO_IPV6, 1916 IPV6CTL_STATS, CTL_EOL); 1917 sysctl_createv(clog, 0, NULL, NULL, 1918 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1919 CTLTYPE_INT, "use_defaultzone", 1920 SYSCTL_DESCR("Whether to use the default scope zones"), 1921 NULL, 0, &ip6_use_defzone, 0, 1922 CTL_NET, PF_INET6, IPPROTO_IPV6, 1923 IPV6CTL_USE_DEFAULTZONE, CTL_EOL); 1924 sysctl_createv(clog, 0, NULL, NULL, 1925 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1926 CTLTYPE_INT, "mcast_pmtu", 1927 SYSCTL_DESCR("Enable pMTU discovery for multicast packet"), 1928 NULL, 0, &ip6_mcast_pmtu, 0, 1929 CTL_NET, PF_INET6, IPPROTO_IPV6, 1930 CTL_CREATE, CTL_EOL); 1931 #ifdef GATEWAY 1932 sysctl_createv(clog, 0, NULL, NULL, 1933 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1934 CTLTYPE_INT, "maxflows", 1935 SYSCTL_DESCR("Number of flows for fast forwarding (IPv6)"), 1936 sysctl_net_inet6_ip6_maxflows, 0, &ip6_maxflows, 0, 1937 CTL_NET, PF_INET6, IPPROTO_IPV6, 1938 CTL_CREATE, CTL_EOL); 1939 sysctl_createv(clog, 0, NULL, NULL, 1940 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1941 CTLTYPE_INT, "hashsize", 1942 SYSCTL_DESCR("Size of hash table for fast forwarding (IPv6)"), 1943 sysctl_net_inet6_ip6_hashsize, 0, &ip6_hashsize, 0, 1944 CTL_NET, PF_INET6, IPPROTO_IPV6, 1945 CTL_CREATE, CTL_EOL); 1946 #endif 1947 } 1948 1949 void 1950 ip6_statinc(u_int stat) 1951 { 1952 1953 KASSERT(stat < IP6_NSTATS); 1954 IP6_STATINC(stat); 1955 } 1956
Indexes created Thu Sep 25 16:09:42 GMT 2025