ip6_input.c revision 1.137
1 /* $NetBSD: ip6_input.c,v 1.137 2012/03/22 20:34:40 drochner 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 1.137 2012/03/22 20:34:40 drochner Exp $"); 66 67 #include "opt_gateway.h" 68 #include "opt_inet.h" 69 #include "opt_inet6.h" 70 #include "opt_ipsec.h" 71 #include "opt_pfil_hooks.h" 72 #include "opt_compat_netbsd.h" 73 74 #include <sys/param.h> 75 #include <sys/systm.h> 76 #include <sys/malloc.h> 77 #include <sys/mbuf.h> 78 #include <sys/domain.h> 79 #include <sys/protosw.h> 80 #include <sys/socket.h> 81 #include <sys/socketvar.h> 82 #include <sys/errno.h> 83 #include <sys/time.h> 84 #include <sys/kernel.h> 85 #include <sys/syslog.h> 86 #include <sys/proc.h> 87 #include <sys/sysctl.h> 88 #include <sys/cprng.h> 89 90 #include <net/if.h> 91 #include <net/if_types.h> 92 #include <net/if_dl.h> 93 #include <net/route.h> 94 #include <net/netisr.h> 95 #ifdef PFIL_HOOKS 96 #include <net/pfil.h> 97 #endif 98 99 #include <netinet/in.h> 100 #include <netinet/in_systm.h> 101 #ifdef INET 102 #include <netinet/ip.h> 103 #include <netinet/ip_icmp.h> 104 #endif /* INET */ 105 #include <netinet/ip6.h> 106 #include <netinet6/in6_var.h> 107 #include <netinet6/ip6_var.h> 108 #include <netinet6/ip6_private.h> 109 #include <netinet6/in6_pcb.h> 110 #include <netinet/icmp6.h> 111 #include <netinet6/scope6_var.h> 112 #include <netinet6/in6_ifattach.h> 113 #include <netinet6/nd6.h> 114 115 #ifdef FAST_IPSEC 116 #include <netipsec/ipsec.h> 117 #include <netipsec/ipsec6.h> 118 #include <netipsec/key.h> 119 #endif /* FAST_IPSEC */ 120 121 #ifdef COMPAT_50 122 #include <compat/sys/time.h> 123 #include <compat/sys/socket.h> 124 #endif 125 126 #include <netinet6/ip6protosw.h> 127 128 #include "faith.h" 129 #include "gif.h" 130 131 #if NGIF > 0 132 #include <netinet6/in6_gif.h> 133 #endif 134 135 #include <net/net_osdep.h> 136 137 extern struct domain inet6domain; 138 139 u_char ip6_protox[IPPROTO_MAX]; 140 static int ip6qmaxlen = IFQ_MAXLEN; 141 struct in6_ifaddr *in6_ifaddr; 142 struct ifqueue ip6intrq; 143 144 extern callout_t in6_tmpaddrtimer_ch; 145 146 int ip6_forward_srcrt; /* XXX */ 147 int ip6_sourcecheck; /* XXX */ 148 int ip6_sourcecheck_interval; /* XXX */ 149 150 #ifdef PFIL_HOOKS 151 struct pfil_head inet6_pfil_hook; 152 #endif 153 154 percpu_t *ip6stat_percpu; 155 156 static void ip6_init2(void *); 157 static struct m_tag *ip6_setdstifaddr(struct mbuf *, const struct in6_ifaddr *); 158 159 static int ip6_process_hopopts(struct mbuf *, u_int8_t *, int, u_int32_t *, 160 u_int32_t *); 161 static struct mbuf *ip6_pullexthdr(struct mbuf *, size_t, int); 162 static void sysctl_net_inet6_ip6_setup(struct sysctllog **); 163 164 /* 165 * IP6 initialization: fill in IP6 protocol switch table. 166 * All protocols not implemented in kernel go to raw IP6 protocol handler. 167 */ 168 void 169 ip6_init(void) 170 { 171 const struct ip6protosw *pr; 172 int i; 173 174 sysctl_net_inet6_ip6_setup(NULL); 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 = cprng_fast32() % MAX_TEMP_DESYNC_FACTOR; 191 192 ip6_init2(NULL); 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 /* 279 * make sure we don't have onion peering information into m_tag. 280 */ 281 ip6_delaux(m); 282 283 /* 284 * mbuf statistics 285 */ 286 if (m->m_flags & M_EXT) { 287 if (m->m_next) 288 IP6_STATINC(IP6_STAT_MEXT2M); 289 else 290 IP6_STATINC(IP6_STAT_MEXT1); 291 } else { 292 #define M2MMAX 32 293 if (m->m_next) { 294 if (m->m_flags & M_LOOP) { 295 /*XXX*/ IP6_STATINC(IP6_STAT_M2M + lo0ifp->if_index); 296 } else if (m->m_pkthdr.rcvif->if_index < M2MMAX) { 297 IP6_STATINC(IP6_STAT_M2M + 298 m->m_pkthdr.rcvif->if_index); 299 } else 300 IP6_STATINC(IP6_STAT_M2M); 301 } else 302 IP6_STATINC(IP6_STAT_M1); 303 #undef M2MMAX 304 } 305 306 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive); 307 IP6_STATINC(IP6_STAT_TOTAL); 308 309 /* 310 * If the IPv6 header is not aligned, slurp it up into a new 311 * mbuf with space for link headers, in the event we forward 312 * it. Otherwise, if it is aligned, make sure the entire base 313 * IPv6 header is in the first mbuf of the chain. 314 */ 315 if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 316 struct ifnet *inifp = m->m_pkthdr.rcvif; 317 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 318 (max_linkhdr + 3) & ~3)) == NULL) { 319 /* XXXJRT new stat, please */ 320 IP6_STATINC(IP6_STAT_TOOSMALL); 321 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 322 return; 323 } 324 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 325 struct ifnet *inifp = m->m_pkthdr.rcvif; 326 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 327 IP6_STATINC(IP6_STAT_TOOSMALL); 328 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 329 return; 330 } 331 } 332 333 ip6 = mtod(m, struct ip6_hdr *); 334 335 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 336 IP6_STATINC(IP6_STAT_BADVERS); 337 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 338 goto bad; 339 } 340 341 /* 342 * Assume that we can create a fast-forward IP flow entry 343 * based on this packet. 344 */ 345 m->m_flags |= M_CANFASTFWD; 346 347 #ifdef PFIL_HOOKS 348 /* 349 * Run through list of hooks for input packets. If there are any 350 * filters which require that additional packets in the flow are 351 * not fast-forwarded, they must clear the M_CANFASTFWD flag. 352 * Note that filters must _never_ set this flag, as another filter 353 * in the list may have previously cleared it. 354 */ 355 /* 356 * let ipfilter look at packet on the wire, 357 * not the decapsulated packet. 358 */ 359 #if defined(FAST_IPSEC) 360 if (!ipsec_indone(m)) 361 #else 362 if (1) 363 #endif 364 { 365 struct in6_addr odst; 366 367 odst = ip6->ip6_dst; 368 if (pfil_run_hooks(&inet6_pfil_hook, &m, m->m_pkthdr.rcvif, 369 PFIL_IN) != 0) 370 return; 371 if (m == NULL) 372 return; 373 ip6 = mtod(m, struct ip6_hdr *); 374 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst); 375 } 376 #endif /* PFIL_HOOKS */ 377 378 IP6_STATINC(IP6_STAT_NXTHIST + ip6->ip6_nxt); 379 380 #ifdef ALTQ 381 if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) { 382 /* packet is dropped by traffic conditioner */ 383 return; 384 } 385 #endif 386 387 /* 388 * Check against address spoofing/corruption. 389 */ 390 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) || 391 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) { 392 /* 393 * XXX: "badscope" is not very suitable for a multicast source. 394 */ 395 IP6_STATINC(IP6_STAT_BADSCOPE); 396 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 397 goto bad; 398 } 399 /* 400 * The following check is not documented in specs. A malicious 401 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack 402 * and bypass security checks (act as if it was from 127.0.0.1 by using 403 * IPv6 src ::ffff:127.0.0.1). Be cautious. 404 * 405 * This check chokes if we are in an SIIT cloud. As none of BSDs 406 * support IPv4-less kernel compilation, we cannot support SIIT 407 * environment at all. So, it makes more sense for us to reject any 408 * malicious packets for non-SIIT environment, than try to do a 409 * partial support for SIIT environment. 410 */ 411 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 412 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 413 IP6_STATINC(IP6_STAT_BADSCOPE); 414 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 415 goto bad; 416 } 417 #if 0 418 /* 419 * Reject packets with IPv4 compatible addresses (auto tunnel). 420 * 421 * The code forbids auto tunnel relay case in RFC1933 (the check is 422 * stronger than RFC1933). We may want to re-enable it if mech-xx 423 * is revised to forbid relaying case. 424 */ 425 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) || 426 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) { 427 IP6_STATINC(IP6_STAT_BADSCOPE); 428 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 429 goto bad; 430 } 431 #endif 432 433 /* 434 * Disambiguate address scope zones (if there is ambiguity). 435 * We first make sure that the original source or destination address 436 * is not in our internal form for scoped addresses. Such addresses 437 * are not necessarily invalid spec-wise, but we cannot accept them due 438 * to the usage conflict. 439 * in6_setscope() then also checks and rejects the cases where src or 440 * dst are the loopback address and the receiving interface 441 * is not loopback. 442 */ 443 if (__predict_false( 444 m_makewritable(&m, 0, sizeof(struct ip6_hdr), M_DONTWAIT))) 445 goto bad; 446 ip6 = mtod(m, struct ip6_hdr *); 447 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) { 448 IP6_STATINC(IP6_STAT_BADSCOPE); /* XXX */ 449 goto bad; 450 } 451 if (in6_setscope(&ip6->ip6_src, m->m_pkthdr.rcvif, NULL) || 452 in6_setscope(&ip6->ip6_dst, m->m_pkthdr.rcvif, NULL)) { 453 IP6_STATINC(IP6_STAT_BADSCOPE); 454 goto bad; 455 } 456 457 /* 458 * Multicast check 459 */ 460 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 461 struct in6_multi *in6m = 0; 462 463 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast); 464 /* 465 * See if we belong to the destination multicast group on the 466 * arrival interface. 467 */ 468 IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m); 469 if (in6m) 470 ours = 1; 471 else if (!ip6_mrouter) { 472 uint64_t *ip6s = IP6_STAT_GETREF(); 473 ip6s[IP6_STAT_NOTMEMBER]++; 474 ip6s[IP6_STAT_CANTFORWARD]++; 475 IP6_STAT_PUTREF(); 476 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 477 goto bad; 478 } 479 deliverifp = m->m_pkthdr.rcvif; 480 goto hbhcheck; 481 } 482 483 sockaddr_in6_init(&u.dst6, &ip6->ip6_dst, 0, 0, 0); 484 485 /* 486 * Unicast check 487 */ 488 rt = rtcache_lookup2(&ip6_forward_rt, &u.dst, 1, &hit); 489 if (hit) 490 IP6_STATINC(IP6_STAT_FORWARD_CACHEHIT); 491 else 492 IP6_STATINC(IP6_STAT_FORWARD_CACHEMISS); 493 494 #define rt6_getkey(__rt) satocsin6(rt_getkey(__rt)) 495 496 /* 497 * Accept the packet if the forwarding interface to the destination 498 * according to the routing table is the loopback interface, 499 * unless the associated route has a gateway. 500 * Note that this approach causes to accept a packet if there is a 501 * route to the loopback interface for the destination of the packet. 502 * But we think it's even useful in some situations, e.g. when using 503 * a special daemon which wants to intercept the packet. 504 */ 505 if (rt != NULL && 506 (rt->rt_flags & (RTF_HOST|RTF_GATEWAY)) == RTF_HOST && 507 !(rt->rt_flags & RTF_CLONED) && 508 #if 0 509 /* 510 * The check below is redundant since the comparison of 511 * the destination and the key of the rtentry has 512 * already done through looking up the routing table. 513 */ 514 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &rt6_getkey(rt)->sin6_addr) && 515 #endif 516 rt->rt_ifp->if_type == IFT_LOOP) { 517 struct in6_ifaddr *ia6 = (struct in6_ifaddr *)rt->rt_ifa; 518 if (ia6->ia6_flags & IN6_IFF_ANYCAST) 519 m->m_flags |= M_ANYCAST6; 520 /* 521 * packets to a tentative, duplicated, or somehow invalid 522 * address must not be accepted. 523 */ 524 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) { 525 /* this address is ready */ 526 ours = 1; 527 deliverifp = ia6->ia_ifp; /* correct? */ 528 goto hbhcheck; 529 } else { 530 /* address is not ready, so discard the packet. */ 531 nd6log((LOG_INFO, 532 "ip6_input: packet to an unready address %s->%s\n", 533 ip6_sprintf(&ip6->ip6_src), 534 ip6_sprintf(&ip6->ip6_dst))); 535 536 goto bad; 537 } 538 } 539 540 /* 541 * FAITH (Firewall Aided Internet Translator) 542 */ 543 #if defined(NFAITH) && 0 < NFAITH 544 if (ip6_keepfaith) { 545 if (rt != NULL && rt->rt_ifp != NULL && 546 rt->rt_ifp->if_type == IFT_FAITH) { 547 /* XXX do we need more sanity checks? */ 548 ours = 1; 549 deliverifp = rt->rt_ifp; /* faith */ 550 goto hbhcheck; 551 } 552 } 553 #endif 554 555 #if 0 556 { 557 /* 558 * Last resort: check in6_ifaddr for incoming interface. 559 * The code is here until I update the "goto ours hack" code above 560 * working right. 561 */ 562 struct ifaddr *ifa; 563 IFADDR_FOREACH(ifa, m->m_pkthdr.rcvif) { 564 if (ifa->ifa_addr == NULL) 565 continue; /* just for safety */ 566 if (ifa->ifa_addr->sa_family != AF_INET6) 567 continue; 568 if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) { 569 ours = 1; 570 deliverifp = ifa->ifa_ifp; 571 goto hbhcheck; 572 } 573 } 574 } 575 #endif 576 577 /* 578 * Now there is no reason to process the packet if it's not our own 579 * and we're not a router. 580 */ 581 if (!ip6_forwarding) { 582 IP6_STATINC(IP6_STAT_CANTFORWARD); 583 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 584 goto bad; 585 } 586 587 hbhcheck: 588 /* 589 * record address information into m_tag, if we don't have one yet. 590 * note that we are unable to record it, if the address is not listed 591 * as our interface address (e.g. multicast addresses, addresses 592 * within FAITH prefixes and such). 593 */ 594 if (deliverifp && ip6_getdstifaddr(m) == NULL) { 595 struct in6_ifaddr *ia6; 596 597 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 598 if (ia6 != NULL && ip6_setdstifaddr(m, ia6) == NULL) { 599 /* 600 * XXX maybe we should drop the packet here, 601 * as we could not provide enough information 602 * to the upper layers. 603 */ 604 } 605 } 606 607 /* 608 * Process Hop-by-Hop options header if it's contained. 609 * m may be modified in ip6_hopopts_input(). 610 * If a JumboPayload option is included, plen will also be modified. 611 */ 612 plen = (u_int32_t)ntohs(ip6->ip6_plen); 613 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 614 struct ip6_hbh *hbh; 615 616 if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) { 617 #if 0 /*touches NULL pointer*/ 618 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 619 #endif 620 return; /* m have already been freed */ 621 } 622 623 /* adjust pointer */ 624 ip6 = mtod(m, struct ip6_hdr *); 625 626 /* 627 * if the payload length field is 0 and the next header field 628 * indicates Hop-by-Hop Options header, then a Jumbo Payload 629 * option MUST be included. 630 */ 631 if (ip6->ip6_plen == 0 && plen == 0) { 632 /* 633 * Note that if a valid jumbo payload option is 634 * contained, ip6_hopopts_input() must set a valid 635 * (non-zero) payload length to the variable plen. 636 */ 637 IP6_STATINC(IP6_STAT_BADOPTIONS); 638 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 639 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 640 icmp6_error(m, ICMP6_PARAM_PROB, 641 ICMP6_PARAMPROB_HEADER, 642 (char *)&ip6->ip6_plen - (char *)ip6); 643 return; 644 } 645 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 646 sizeof(struct ip6_hbh)); 647 if (hbh == NULL) { 648 IP6_STATINC(IP6_STAT_TOOSHORT); 649 return; 650 } 651 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 652 nxt = hbh->ip6h_nxt; 653 654 /* 655 * accept the packet if a router alert option is included 656 * and we act as an IPv6 router. 657 */ 658 if (rtalert != ~0 && ip6_forwarding) 659 ours = 1; 660 } else 661 nxt = ip6->ip6_nxt; 662 663 /* 664 * Check that the amount of data in the buffers 665 * is as at least much as the IPv6 header would have us expect. 666 * Trim mbufs if longer than we expect. 667 * Drop packet if shorter than we expect. 668 */ 669 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 670 IP6_STATINC(IP6_STAT_TOOSHORT); 671 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 672 goto bad; 673 } 674 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 675 if (m->m_len == m->m_pkthdr.len) { 676 m->m_len = sizeof(struct ip6_hdr) + plen; 677 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 678 } else 679 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 680 } 681 682 /* 683 * Forward if desirable. 684 */ 685 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 686 /* 687 * If we are acting as a multicast router, all 688 * incoming multicast packets are passed to the 689 * kernel-level multicast forwarding function. 690 * The packet is returned (relatively) intact; if 691 * ip6_mforward() returns a non-zero value, the packet 692 * must be discarded, else it may be accepted below. 693 */ 694 if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) { 695 IP6_STATINC(IP6_STAT_CANTFORWARD); 696 m_freem(m); 697 return; 698 } 699 if (!ours) { 700 m_freem(m); 701 return; 702 } 703 } else if (!ours) { 704 ip6_forward(m, srcrt); 705 return; 706 } 707 708 ip6 = mtod(m, struct ip6_hdr *); 709 710 /* 711 * Malicious party may be able to use IPv4 mapped addr to confuse 712 * tcp/udp stack and bypass security checks (act as if it was from 713 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious. 714 * 715 * For SIIT end node behavior, you may want to disable the check. 716 * However, you will become vulnerable to attacks using IPv4 mapped 717 * source. 718 */ 719 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 720 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 721 IP6_STATINC(IP6_STAT_BADSCOPE); 722 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 723 goto bad; 724 } 725 726 /* 727 * Tell launch routine the next header 728 */ 729 #ifdef IFA_STATS 730 if (deliverifp != NULL) { 731 struct in6_ifaddr *ia6; 732 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 733 if (ia6) 734 ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len; 735 } 736 #endif 737 IP6_STATINC(IP6_STAT_DELIVERED); 738 in6_ifstat_inc(deliverifp, ifs6_in_deliver); 739 nest = 0; 740 741 rh_present = 0; 742 while (nxt != IPPROTO_DONE) { 743 if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) { 744 IP6_STATINC(IP6_STAT_TOOMANYHDR); 745 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 746 goto bad; 747 } 748 749 /* 750 * protection against faulty packet - there should be 751 * more sanity checks in header chain processing. 752 */ 753 if (m->m_pkthdr.len < off) { 754 IP6_STATINC(IP6_STAT_TOOSHORT); 755 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 756 goto bad; 757 } 758 759 if (nxt == IPPROTO_ROUTING) { 760 if (rh_present++) { 761 in6_ifstat_inc(m->m_pkthdr.rcvif, 762 ifs6_in_hdrerr); 763 IP6_STATINC(IP6_STAT_BADOPTIONS); 764 goto bad; 765 } 766 } 767 768 #ifdef FAST_IPSEC 769 /* 770 * enforce IPsec policy checking if we are seeing last header. 771 * note that we do not visit this with protocols with pcb layer 772 * code - like udp/tcp/raw ip. 773 */ 774 if ((inet6sw[ip_protox[nxt]].pr_flags & PR_LASTHDR) != 0) { 775 /* 776 * Check if the packet has already had IPsec processing 777 * done. If so, then just pass it along. This tag gets 778 * set during AH, ESP, etc. input handling, before the 779 * packet is returned to the ip input queue for delivery. 780 */ 781 mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL); 782 s = splsoftnet(); 783 if (mtag != NULL) { 784 tdbi = (struct tdb_ident *)(mtag + 1); 785 sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND); 786 } else { 787 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, 788 IP_FORWARDING, &error); 789 } 790 if (sp != NULL) { 791 /* 792 * Check security policy against packet attributes. 793 */ 794 error = ipsec_in_reject(sp, m); 795 KEY_FREESP(&sp); 796 } else { 797 /* XXX error stat??? */ 798 error = EINVAL; 799 DPRINTF(("ip6_input: no SP, packet discarded\n"));/*XXX*/ 800 } 801 splx(s); 802 if (error) 803 goto bad; 804 } 805 #endif /* FAST_IPSEC */ 806 807 808 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt); 809 } 810 return; 811 bad: 812 m_freem(m); 813 } 814 815 /* 816 * set/grab in6_ifaddr correspond to IPv6 destination address. 817 */ 818 static struct m_tag * 819 ip6_setdstifaddr(struct mbuf *m, const struct in6_ifaddr *ia) 820 { 821 struct m_tag *mtag; 822 823 mtag = ip6_addaux(m); 824 if (mtag != NULL) { 825 struct ip6aux *ip6a; 826 827 ip6a = (struct ip6aux *)(mtag + 1); 828 in6_setscope(&ip6a->ip6a_src, ia->ia_ifp, &ip6a->ip6a_scope_id); 829 ip6a->ip6a_src = ia->ia_addr.sin6_addr; 830 ip6a->ip6a_flags = ia->ia6_flags; 831 } 832 return mtag; /* NULL if failed to set */ 833 } 834 835 const struct ip6aux * 836 ip6_getdstifaddr(struct mbuf *m) 837 { 838 struct m_tag *mtag; 839 840 mtag = ip6_findaux(m); 841 if (mtag != NULL) 842 return (struct ip6aux *)(mtag + 1); 843 else 844 return NULL; 845 } 846 847 /* 848 * Hop-by-Hop options header processing. If a valid jumbo payload option is 849 * included, the real payload length will be stored in plenp. 850 * 851 * rtalertp - XXX: should be stored more smart way 852 */ 853 int 854 ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp, 855 struct mbuf **mp, int *offp) 856 { 857 struct mbuf *m = *mp; 858 int off = *offp, hbhlen; 859 struct ip6_hbh *hbh; 860 861 /* validation of the length of the header */ 862 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, 863 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh)); 864 if (hbh == NULL) { 865 IP6_STATINC(IP6_STAT_TOOSHORT); 866 return -1; 867 } 868 hbhlen = (hbh->ip6h_len + 1) << 3; 869 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 870 hbhlen); 871 if (hbh == NULL) { 872 IP6_STATINC(IP6_STAT_TOOSHORT); 873 return -1; 874 } 875 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 876 off += hbhlen; 877 hbhlen -= sizeof(struct ip6_hbh); 878 879 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 880 hbhlen, rtalertp, plenp) < 0) 881 return (-1); 882 883 *offp = off; 884 *mp = m; 885 return (0); 886 } 887 888 /* 889 * Search header for all Hop-by-hop options and process each option. 890 * This function is separate from ip6_hopopts_input() in order to 891 * handle a case where the sending node itself process its hop-by-hop 892 * options header. In such a case, the function is called from ip6_output(). 893 * 894 * The function assumes that hbh header is located right after the IPv6 header 895 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to 896 * opthead + hbhlen is located in continuous memory region. 897 */ 898 static int 899 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen, 900 u_int32_t *rtalertp, u_int32_t *plenp) 901 { 902 struct ip6_hdr *ip6; 903 int optlen = 0; 904 u_int8_t *opt = opthead; 905 u_int16_t rtalert_val; 906 u_int32_t jumboplen; 907 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh); 908 909 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 910 switch (*opt) { 911 case IP6OPT_PAD1: 912 optlen = 1; 913 break; 914 case IP6OPT_PADN: 915 if (hbhlen < IP6OPT_MINLEN) { 916 IP6_STATINC(IP6_STAT_TOOSMALL); 917 goto bad; 918 } 919 optlen = *(opt + 1) + 2; 920 break; 921 case IP6OPT_RTALERT: 922 /* XXX may need check for alignment */ 923 if (hbhlen < IP6OPT_RTALERT_LEN) { 924 IP6_STATINC(IP6_STAT_TOOSMALL); 925 goto bad; 926 } 927 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) { 928 /* XXX stat */ 929 icmp6_error(m, ICMP6_PARAM_PROB, 930 ICMP6_PARAMPROB_HEADER, 931 erroff + opt + 1 - opthead); 932 return (-1); 933 } 934 optlen = IP6OPT_RTALERT_LEN; 935 memcpy((void *)&rtalert_val, (void *)(opt + 2), 2); 936 *rtalertp = ntohs(rtalert_val); 937 break; 938 case IP6OPT_JUMBO: 939 /* XXX may need check for alignment */ 940 if (hbhlen < IP6OPT_JUMBO_LEN) { 941 IP6_STATINC(IP6_STAT_TOOSMALL); 942 goto bad; 943 } 944 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) { 945 /* XXX stat */ 946 icmp6_error(m, ICMP6_PARAM_PROB, 947 ICMP6_PARAMPROB_HEADER, 948 erroff + opt + 1 - opthead); 949 return (-1); 950 } 951 optlen = IP6OPT_JUMBO_LEN; 952 953 /* 954 * IPv6 packets that have non 0 payload length 955 * must not contain a jumbo payload option. 956 */ 957 ip6 = mtod(m, struct ip6_hdr *); 958 if (ip6->ip6_plen) { 959 IP6_STATINC(IP6_STAT_BADOPTIONS); 960 icmp6_error(m, ICMP6_PARAM_PROB, 961 ICMP6_PARAMPROB_HEADER, 962 erroff + opt - opthead); 963 return (-1); 964 } 965 966 /* 967 * We may see jumbolen in unaligned location, so 968 * we'd need to perform bcopy(). 969 */ 970 memcpy(&jumboplen, opt + 2, sizeof(jumboplen)); 971 jumboplen = (u_int32_t)htonl(jumboplen); 972 973 #if 1 974 /* 975 * if there are multiple jumbo payload options, 976 * *plenp will be non-zero and the packet will be 977 * rejected. 978 * the behavior may need some debate in ipngwg - 979 * multiple options does not make sense, however, 980 * there's no explicit mention in specification. 981 */ 982 if (*plenp != 0) { 983 IP6_STATINC(IP6_STAT_BADOPTIONS); 984 icmp6_error(m, ICMP6_PARAM_PROB, 985 ICMP6_PARAMPROB_HEADER, 986 erroff + opt + 2 - opthead); 987 return (-1); 988 } 989 #endif 990 991 /* 992 * jumbo payload length must be larger than 65535. 993 */ 994 if (jumboplen <= IPV6_MAXPACKET) { 995 IP6_STATINC(IP6_STAT_BADOPTIONS); 996 icmp6_error(m, ICMP6_PARAM_PROB, 997 ICMP6_PARAMPROB_HEADER, 998 erroff + opt + 2 - opthead); 999 return (-1); 1000 } 1001 *plenp = jumboplen; 1002 1003 break; 1004 default: /* unknown option */ 1005 if (hbhlen < IP6OPT_MINLEN) { 1006 IP6_STATINC(IP6_STAT_TOOSMALL); 1007 goto bad; 1008 } 1009 optlen = ip6_unknown_opt(opt, m, 1010 erroff + opt - opthead); 1011 if (optlen == -1) 1012 return (-1); 1013 optlen += 2; 1014 break; 1015 } 1016 } 1017 1018 return (0); 1019 1020 bad: 1021 m_freem(m); 1022 return (-1); 1023 } 1024 1025 /* 1026 * Unknown option processing. 1027 * The third argument `off' is the offset from the IPv6 header to the option, 1028 * which is necessary if the IPv6 header the and option header and IPv6 header 1029 * is not continuous in order to return an ICMPv6 error. 1030 */ 1031 int 1032 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off) 1033 { 1034 struct ip6_hdr *ip6; 1035 1036 switch (IP6OPT_TYPE(*optp)) { 1037 case IP6OPT_TYPE_SKIP: /* ignore the option */ 1038 return ((int)*(optp + 1)); 1039 case IP6OPT_TYPE_DISCARD: /* silently discard */ 1040 m_freem(m); 1041 return (-1); 1042 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 1043 IP6_STATINC(IP6_STAT_BADOPTIONS); 1044 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 1045 return (-1); 1046 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 1047 IP6_STATINC(IP6_STAT_BADOPTIONS); 1048 ip6 = mtod(m, struct ip6_hdr *); 1049 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 1050 (m->m_flags & (M_BCAST|M_MCAST))) 1051 m_freem(m); 1052 else 1053 icmp6_error(m, ICMP6_PARAM_PROB, 1054 ICMP6_PARAMPROB_OPTION, off); 1055 return (-1); 1056 } 1057 1058 m_freem(m); /* XXX: NOTREACHED */ 1059 return (-1); 1060 } 1061 1062 /* 1063 * Create the "control" list for this pcb. 1064 * 1065 * The routine will be called from upper layer handlers like tcp6_input(). 1066 * Thus the routine assumes that the caller (tcp6_input) have already 1067 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the 1068 * very first mbuf on the mbuf chain. 1069 * We may want to add some infinite loop prevention or sanity checks for safety. 1070 * (This applies only when you are using KAME mbuf chain restriction, i.e. 1071 * you are using IP6_EXTHDR_CHECK() not m_pulldown()) 1072 */ 1073 void 1074 ip6_savecontrol(struct in6pcb *in6p, struct mbuf **mp, 1075 struct ip6_hdr *ip6, struct mbuf *m) 1076 { 1077 #ifdef RFC2292 1078 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y)) 1079 #else 1080 #define IS2292(x, y) (y) 1081 #endif 1082 1083 if (in6p->in6p_socket->so_options & SO_TIMESTAMP 1084 #ifdef SO_OTIMESTAMP 1085 || in6p->in6p_socket->so_options & SO_OTIMESTAMP 1086 #endif 1087 ) { 1088 struct timeval tv; 1089 1090 microtime(&tv); 1091 #ifdef SO_OTIMESTAMP 1092 if (in6p->in6p_socket->so_options & SO_OTIMESTAMP) { 1093 struct timeval50 tv50; 1094 timeval_to_timeval50(&tv, &tv50); 1095 *mp = sbcreatecontrol((void *) &tv50, sizeof(tv50), 1096 SCM_OTIMESTAMP, SOL_SOCKET); 1097 } else 1098 #endif 1099 *mp = sbcreatecontrol((void *) &tv, sizeof(tv), 1100 SCM_TIMESTAMP, SOL_SOCKET); 1101 if (*mp) 1102 mp = &(*mp)->m_next; 1103 } 1104 1105 /* some OSes call this logic with IPv4 packet, for SO_TIMESTAMP */ 1106 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) 1107 return; 1108 1109 /* RFC 2292 sec. 5 */ 1110 if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) { 1111 struct in6_pktinfo pi6; 1112 1113 memcpy(&pi6.ipi6_addr, &ip6->ip6_dst, sizeof(struct in6_addr)); 1114 in6_clearscope(&pi6.ipi6_addr); /* XXX */ 1115 pi6.ipi6_ifindex = m->m_pkthdr.rcvif ? 1116 m->m_pkthdr.rcvif->if_index : 0; 1117 *mp = sbcreatecontrol((void *) &pi6, 1118 sizeof(struct in6_pktinfo), 1119 IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6); 1120 if (*mp) 1121 mp = &(*mp)->m_next; 1122 } 1123 1124 if (in6p->in6p_flags & IN6P_HOPLIMIT) { 1125 int hlim = ip6->ip6_hlim & 0xff; 1126 1127 *mp = sbcreatecontrol((void *) &hlim, sizeof(int), 1128 IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6); 1129 if (*mp) 1130 mp = &(*mp)->m_next; 1131 } 1132 1133 if ((in6p->in6p_flags & IN6P_TCLASS) != 0) { 1134 u_int32_t flowinfo; 1135 int tclass; 1136 1137 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK); 1138 flowinfo >>= 20; 1139 1140 tclass = flowinfo & 0xff; 1141 *mp = sbcreatecontrol((void *)&tclass, sizeof(tclass), 1142 IPV6_TCLASS, IPPROTO_IPV6); 1143 1144 if (*mp) 1145 mp = &(*mp)->m_next; 1146 } 1147 1148 /* 1149 * IPV6_HOPOPTS socket option. Recall that we required super-user 1150 * privilege for the option (see ip6_ctloutput), but it might be too 1151 * strict, since there might be some hop-by-hop options which can be 1152 * returned to normal user. 1153 * See also RFC3542 section 8 (or RFC2292 section 6). 1154 */ 1155 if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0) { 1156 /* 1157 * Check if a hop-by-hop options header is contatined in the 1158 * received packet, and if so, store the options as ancillary 1159 * data. Note that a hop-by-hop options header must be 1160 * just after the IPv6 header, which fact is assured through 1161 * the IPv6 input processing. 1162 */ 1163 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1164 if (xip6->ip6_nxt == IPPROTO_HOPOPTS) { 1165 struct ip6_hbh *hbh; 1166 int hbhlen; 1167 struct mbuf *ext; 1168 1169 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr), 1170 xip6->ip6_nxt); 1171 if (ext == NULL) { 1172 IP6_STATINC(IP6_STAT_TOOSHORT); 1173 return; 1174 } 1175 hbh = mtod(ext, struct ip6_hbh *); 1176 hbhlen = (hbh->ip6h_len + 1) << 3; 1177 if (hbhlen != ext->m_len) { 1178 m_freem(ext); 1179 IP6_STATINC(IP6_STAT_TOOSHORT); 1180 return; 1181 } 1182 1183 /* 1184 * XXX: We copy whole the header even if a jumbo 1185 * payload option is included, which option is to 1186 * be removed before returning in the RFC 2292. 1187 * Note: this constraint is removed in RFC3542. 1188 */ 1189 *mp = sbcreatecontrol((void *)hbh, hbhlen, 1190 IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS), 1191 IPPROTO_IPV6); 1192 if (*mp) 1193 mp = &(*mp)->m_next; 1194 m_freem(ext); 1195 } 1196 } 1197 1198 /* IPV6_DSTOPTS and IPV6_RTHDR socket options */ 1199 if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) { 1200 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1201 int nxt = xip6->ip6_nxt, off = sizeof(struct ip6_hdr); 1202 1203 /* 1204 * Search for destination options headers or routing 1205 * header(s) through the header chain, and stores each 1206 * header as ancillary data. 1207 * Note that the order of the headers remains in 1208 * the chain of ancillary data. 1209 */ 1210 for (;;) { /* is explicit loop prevention necessary? */ 1211 struct ip6_ext *ip6e = NULL; 1212 int elen; 1213 struct mbuf *ext = NULL; 1214 1215 /* 1216 * if it is not an extension header, don't try to 1217 * pull it from the chain. 1218 */ 1219 switch (nxt) { 1220 case IPPROTO_DSTOPTS: 1221 case IPPROTO_ROUTING: 1222 case IPPROTO_HOPOPTS: 1223 case IPPROTO_AH: /* is it possible? */ 1224 break; 1225 default: 1226 goto loopend; 1227 } 1228 1229 ext = ip6_pullexthdr(m, off, nxt); 1230 if (ext == NULL) { 1231 IP6_STATINC(IP6_STAT_TOOSHORT); 1232 return; 1233 } 1234 ip6e = mtod(ext, struct ip6_ext *); 1235 if (nxt == IPPROTO_AH) 1236 elen = (ip6e->ip6e_len + 2) << 2; 1237 else 1238 elen = (ip6e->ip6e_len + 1) << 3; 1239 if (elen != ext->m_len) { 1240 m_freem(ext); 1241 IP6_STATINC(IP6_STAT_TOOSHORT); 1242 return; 1243 } 1244 KASSERT(IP6_HDR_ALIGNED_P(ip6e)); 1245 1246 switch (nxt) { 1247 case IPPROTO_DSTOPTS: 1248 if (!(in6p->in6p_flags & IN6P_DSTOPTS)) 1249 break; 1250 1251 *mp = sbcreatecontrol((void *)ip6e, elen, 1252 IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS), 1253 IPPROTO_IPV6); 1254 if (*mp) 1255 mp = &(*mp)->m_next; 1256 break; 1257 1258 case IPPROTO_ROUTING: 1259 if (!(in6p->in6p_flags & IN6P_RTHDR)) 1260 break; 1261 1262 *mp = sbcreatecontrol((void *)ip6e, elen, 1263 IS2292(IPV6_2292RTHDR, IPV6_RTHDR), 1264 IPPROTO_IPV6); 1265 if (*mp) 1266 mp = &(*mp)->m_next; 1267 break; 1268 1269 case IPPROTO_HOPOPTS: 1270 case IPPROTO_AH: /* is it possible? */ 1271 break; 1272 1273 default: 1274 /* 1275 * other cases have been filtered in the above. 1276 * none will visit this case. here we supply 1277 * the code just in case (nxt overwritten or 1278 * other cases). 1279 */ 1280 m_freem(ext); 1281 goto loopend; 1282 1283 } 1284 1285 /* proceed with the next header. */ 1286 off += elen; 1287 nxt = ip6e->ip6e_nxt; 1288 ip6e = NULL; 1289 m_freem(ext); 1290 ext = NULL; 1291 } 1292 loopend: 1293 ; 1294 } 1295 } 1296 #undef IS2292 1297 1298 1299 void 1300 ip6_notify_pmtu(struct in6pcb *in6p, const struct sockaddr_in6 *dst, 1301 uint32_t *mtu) 1302 { 1303 struct socket *so; 1304 struct mbuf *m_mtu; 1305 struct ip6_mtuinfo mtuctl; 1306 1307 so = in6p->in6p_socket; 1308 1309 if (mtu == NULL) 1310 return; 1311 1312 #ifdef DIAGNOSTIC 1313 if (so == NULL) /* I believe this is impossible */ 1314 panic("ip6_notify_pmtu: socket is NULL"); 1315 #endif 1316 1317 memset(&mtuctl, 0, sizeof(mtuctl)); /* zero-clear for safety */ 1318 mtuctl.ip6m_mtu = *mtu; 1319 mtuctl.ip6m_addr = *dst; 1320 if (sa6_recoverscope(&mtuctl.ip6m_addr)) 1321 return; 1322 1323 if ((m_mtu = sbcreatecontrol((void *)&mtuctl, sizeof(mtuctl), 1324 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL) 1325 return; 1326 1327 if (sbappendaddr(&so->so_rcv, (const struct sockaddr *)dst, NULL, m_mtu) 1328 == 0) { 1329 m_freem(m_mtu); 1330 /* XXX: should count statistics */ 1331 } else 1332 sorwakeup(so); 1333 1334 return; 1335 } 1336 1337 /* 1338 * pull single extension header from mbuf chain. returns single mbuf that 1339 * contains the result, or NULL on error. 1340 */ 1341 static struct mbuf * 1342 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt) 1343 { 1344 struct ip6_ext ip6e; 1345 size_t elen; 1346 struct mbuf *n; 1347 1348 #ifdef DIAGNOSTIC 1349 switch (nxt) { 1350 case IPPROTO_DSTOPTS: 1351 case IPPROTO_ROUTING: 1352 case IPPROTO_HOPOPTS: 1353 case IPPROTO_AH: /* is it possible? */ 1354 break; 1355 default: 1356 printf("ip6_pullexthdr: invalid nxt=%d\n", nxt); 1357 } 1358 #endif 1359 1360 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1361 if (nxt == IPPROTO_AH) 1362 elen = (ip6e.ip6e_len + 2) << 2; 1363 else 1364 elen = (ip6e.ip6e_len + 1) << 3; 1365 1366 MGET(n, M_DONTWAIT, MT_DATA); 1367 if (n && elen >= MLEN) { 1368 MCLGET(n, M_DONTWAIT); 1369 if ((n->m_flags & M_EXT) == 0) { 1370 m_free(n); 1371 n = NULL; 1372 } 1373 } 1374 if (!n) 1375 return NULL; 1376 1377 n->m_len = 0; 1378 if (elen >= M_TRAILINGSPACE(n)) { 1379 m_free(n); 1380 return NULL; 1381 } 1382 1383 m_copydata(m, off, elen, mtod(n, void *)); 1384 n->m_len = elen; 1385 return n; 1386 } 1387 1388 /* 1389 * Get pointer to the previous header followed by the header 1390 * currently processed. 1391 * XXX: This function supposes that 1392 * M includes all headers, 1393 * the next header field and the header length field of each header 1394 * are valid, and 1395 * the sum of each header length equals to OFF. 1396 * Because of these assumptions, this function must be called very 1397 * carefully. Moreover, it will not be used in the near future when 1398 * we develop `neater' mechanism to process extension headers. 1399 */ 1400 u_int8_t * 1401 ip6_get_prevhdr(struct mbuf *m, int off) 1402 { 1403 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1404 1405 if (off == sizeof(struct ip6_hdr)) 1406 return (&ip6->ip6_nxt); 1407 else { 1408 int len, nxt; 1409 struct ip6_ext *ip6e = NULL; 1410 1411 nxt = ip6->ip6_nxt; 1412 len = sizeof(struct ip6_hdr); 1413 while (len < off) { 1414 ip6e = (struct ip6_ext *)(mtod(m, char *) + len); 1415 1416 switch (nxt) { 1417 case IPPROTO_FRAGMENT: 1418 len += sizeof(struct ip6_frag); 1419 break; 1420 case IPPROTO_AH: 1421 len += (ip6e->ip6e_len + 2) << 2; 1422 break; 1423 default: 1424 len += (ip6e->ip6e_len + 1) << 3; 1425 break; 1426 } 1427 nxt = ip6e->ip6e_nxt; 1428 } 1429 if (ip6e) 1430 return (&ip6e->ip6e_nxt); 1431 else 1432 return NULL; 1433 } 1434 } 1435 1436 /* 1437 * get next header offset. m will be retained. 1438 */ 1439 int 1440 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp) 1441 { 1442 struct ip6_hdr ip6; 1443 struct ip6_ext ip6e; 1444 struct ip6_frag fh; 1445 1446 /* just in case */ 1447 if (m == NULL) 1448 panic("ip6_nexthdr: m == NULL"); 1449 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off) 1450 return -1; 1451 1452 switch (proto) { 1453 case IPPROTO_IPV6: 1454 /* do not chase beyond intermediate IPv6 headers */ 1455 if (off != 0) 1456 return -1; 1457 if (m->m_pkthdr.len < off + sizeof(ip6)) 1458 return -1; 1459 m_copydata(m, off, sizeof(ip6), (void *)&ip6); 1460 if (nxtp) 1461 *nxtp = ip6.ip6_nxt; 1462 off += sizeof(ip6); 1463 return off; 1464 1465 case IPPROTO_FRAGMENT: 1466 /* 1467 * terminate parsing if it is not the first fragment, 1468 * it does not make sense to parse through it. 1469 */ 1470 if (m->m_pkthdr.len < off + sizeof(fh)) 1471 return -1; 1472 m_copydata(m, off, sizeof(fh), (void *)&fh); 1473 if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0) 1474 return -1; 1475 if (nxtp) 1476 *nxtp = fh.ip6f_nxt; 1477 off += sizeof(struct ip6_frag); 1478 return off; 1479 1480 case IPPROTO_AH: 1481 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1482 return -1; 1483 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1484 if (nxtp) 1485 *nxtp = ip6e.ip6e_nxt; 1486 off += (ip6e.ip6e_len + 2) << 2; 1487 if (m->m_pkthdr.len < off) 1488 return -1; 1489 return off; 1490 1491 case IPPROTO_HOPOPTS: 1492 case IPPROTO_ROUTING: 1493 case IPPROTO_DSTOPTS: 1494 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1495 return -1; 1496 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1497 if (nxtp) 1498 *nxtp = ip6e.ip6e_nxt; 1499 off += (ip6e.ip6e_len + 1) << 3; 1500 if (m->m_pkthdr.len < off) 1501 return -1; 1502 return off; 1503 1504 case IPPROTO_NONE: 1505 case IPPROTO_ESP: 1506 case IPPROTO_IPCOMP: 1507 /* give up */ 1508 return -1; 1509 1510 default: 1511 return -1; 1512 } 1513 } 1514 1515 /* 1516 * get offset for the last header in the chain. m will be kept untainted. 1517 */ 1518 int 1519 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp) 1520 { 1521 int newoff; 1522 int nxt; 1523 1524 if (!nxtp) { 1525 nxt = -1; 1526 nxtp = &nxt; 1527 } 1528 for (;;) { 1529 newoff = ip6_nexthdr(m, off, proto, nxtp); 1530 if (newoff < 0) 1531 return off; 1532 else if (newoff < off) 1533 return -1; /* invalid */ 1534 else if (newoff == off) 1535 return newoff; 1536 1537 off = newoff; 1538 proto = *nxtp; 1539 } 1540 } 1541 1542 struct m_tag * 1543 ip6_addaux(struct mbuf *m) 1544 { 1545 struct m_tag *mtag; 1546 1547 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1548 if (!mtag) { 1549 mtag = m_tag_get(PACKET_TAG_INET6, sizeof(struct ip6aux), 1550 M_NOWAIT); 1551 if (mtag) { 1552 m_tag_prepend(m, mtag); 1553 memset(mtag + 1, 0, sizeof(struct ip6aux)); 1554 } 1555 } 1556 return mtag; 1557 } 1558 1559 struct m_tag * 1560 ip6_findaux(struct mbuf *m) 1561 { 1562 struct m_tag *mtag; 1563 1564 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1565 return mtag; 1566 } 1567 1568 void 1569 ip6_delaux(struct mbuf *m) 1570 { 1571 struct m_tag *mtag; 1572 1573 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1574 if (mtag) 1575 m_tag_delete(m, mtag); 1576 } 1577 1578 #ifdef GATEWAY 1579 /* 1580 * sysctl helper routine for net.inet.ip6.maxflows. Since 1581 * we could reduce this value, call ip6flow_reap(); 1582 */ 1583 static int 1584 sysctl_net_inet6_ip6_maxflows(SYSCTLFN_ARGS) 1585 { 1586 int error; 1587 1588 error = sysctl_lookup(SYSCTLFN_CALL(rnode)); 1589 if (error || newp == NULL) 1590 return (error); 1591 1592 mutex_enter(softnet_lock); 1593 KERNEL_LOCK(1, NULL); 1594 1595 ip6flow_reap(0); 1596 1597 KERNEL_UNLOCK_ONE(NULL); 1598 mutex_exit(softnet_lock); 1599 1600 return (0); 1601 } 1602 1603 static int 1604 sysctl_net_inet6_ip6_hashsize(SYSCTLFN_ARGS) 1605 { 1606 int error, tmp; 1607 struct sysctlnode node; 1608 1609 node = *rnode; 1610 tmp = ip6_hashsize; 1611 node.sysctl_data = &tmp; 1612 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 1613 if (error || newp == NULL) 1614 return (error); 1615 1616 if ((tmp & (tmp - 1)) == 0 && tmp != 0) { 1617 /* 1618 * Can only fail due to malloc() 1619 */ 1620 mutex_enter(softnet_lock); 1621 KERNEL_LOCK(1, NULL); 1622 1623 error = ip6flow_invalidate_all(tmp); 1624 1625 KERNEL_UNLOCK_ONE(NULL); 1626 mutex_exit(softnet_lock); 1627 } else { 1628 /* 1629 * EINVAL if not a power of 2 1630 */ 1631 error = EINVAL; 1632 } 1633 1634 return error; 1635 } 1636 #endif /* GATEWAY */ 1637 1638 /* 1639 * System control for IP6 1640 */ 1641 1642 const u_char inet6ctlerrmap[PRC_NCMDS] = { 1643 0, 0, 0, 0, 1644 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 1645 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 1646 EMSGSIZE, EHOSTUNREACH, 0, 0, 1647 0, 0, 0, 0, 1648 ENOPROTOOPT 1649 }; 1650 1651 static int 1652 sysctl_net_inet6_ip6_stats(SYSCTLFN_ARGS) 1653 { 1654 1655 return (NETSTAT_SYSCTL(ip6stat_percpu, IP6_NSTATS)); 1656 } 1657 1658 static void 1659 sysctl_net_inet6_ip6_setup(struct sysctllog **clog) 1660 { 1661 #ifdef RFC2292 1662 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y)) 1663 #else 1664 #define IS2292(x, y) (y) 1665 #endif 1666 1667 sysctl_createv(clog, 0, NULL, NULL, 1668 CTLFLAG_PERMANENT, 1669 CTLTYPE_NODE, "net", NULL, 1670 NULL, 0, NULL, 0, 1671 CTL_NET, CTL_EOL); 1672 sysctl_createv(clog, 0, NULL, NULL, 1673 CTLFLAG_PERMANENT, 1674 CTLTYPE_NODE, "inet6", 1675 SYSCTL_DESCR("PF_INET6 related settings"), 1676 NULL, 0, NULL, 0, 1677 CTL_NET, PF_INET6, CTL_EOL); 1678 sysctl_createv(clog, 0, NULL, NULL, 1679 CTLFLAG_PERMANENT, 1680 CTLTYPE_NODE, "ip6", 1681 SYSCTL_DESCR("IPv6 related settings"), 1682 NULL, 0, NULL, 0, 1683 CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_EOL); 1684 1685 sysctl_createv(clog, 0, NULL, NULL, 1686 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1687 CTLTYPE_INT, "forwarding", 1688 SYSCTL_DESCR("Enable forwarding of INET6 datagrams"), 1689 NULL, 0, &ip6_forwarding, 0, 1690 CTL_NET, PF_INET6, IPPROTO_IPV6, 1691 IPV6CTL_FORWARDING, CTL_EOL); 1692 sysctl_createv(clog, 0, NULL, NULL, 1693 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1694 CTLTYPE_INT, "redirect", 1695 SYSCTL_DESCR("Enable sending of ICMPv6 redirect messages"), 1696 NULL, 0, &ip6_sendredirects, 0, 1697 CTL_NET, PF_INET6, IPPROTO_IPV6, 1698 IPV6CTL_SENDREDIRECTS, CTL_EOL); 1699 sysctl_createv(clog, 0, NULL, NULL, 1700 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1701 CTLTYPE_INT, "hlim", 1702 SYSCTL_DESCR("Hop limit for an INET6 datagram"), 1703 NULL, 0, &ip6_defhlim, 0, 1704 CTL_NET, PF_INET6, IPPROTO_IPV6, 1705 IPV6CTL_DEFHLIM, CTL_EOL); 1706 #ifdef notyet 1707 sysctl_createv(clog, 0, NULL, NULL, 1708 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1709 CTLTYPE_INT, "mtu", NULL, 1710 NULL, 0, &, 0, 1711 CTL_NET, PF_INET6, IPPROTO_IPV6, 1712 IPV6CTL_DEFMTU, CTL_EOL); 1713 #endif 1714 #ifdef __no_idea__ 1715 sysctl_createv(clog, 0, NULL, NULL, 1716 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1717 CTLTYPE_INT, "forwsrcrt", NULL, 1718 NULL, 0, &?, 0, 1719 CTL_NET, PF_INET6, IPPROTO_IPV6, 1720 IPV6CTL_FORWSRCRT, CTL_EOL); 1721 sysctl_createv(clog, 0, NULL, NULL, 1722 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1723 CTLTYPE_STRUCT, "mrtstats", NULL, 1724 NULL, 0, &?, sizeof(?), 1725 CTL_NET, PF_INET6, IPPROTO_IPV6, 1726 IPV6CTL_MRTSTATS, CTL_EOL); 1727 sysctl_createv(clog, 0, NULL, NULL, 1728 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1729 CTLTYPE_?, "mrtproto", NULL, 1730 NULL, 0, &?, sizeof(?), 1731 CTL_NET, PF_INET6, IPPROTO_IPV6, 1732 IPV6CTL_MRTPROTO, CTL_EOL); 1733 #endif 1734 sysctl_createv(clog, 0, NULL, NULL, 1735 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1736 CTLTYPE_INT, "maxfragpackets", 1737 SYSCTL_DESCR("Maximum number of fragments to buffer " 1738 "for reassembly"), 1739 NULL, 0, &ip6_maxfragpackets, 0, 1740 CTL_NET, PF_INET6, IPPROTO_IPV6, 1741 IPV6CTL_MAXFRAGPACKETS, CTL_EOL); 1742 #ifdef __no_idea__ 1743 sysctl_createv(clog, 0, NULL, NULL, 1744 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1745 CTLTYPE_INT, "sourcecheck", NULL, 1746 NULL, 0, &?, 0, 1747 CTL_NET, PF_INET6, IPPROTO_IPV6, 1748 IPV6CTL_SOURCECHECK, CTL_EOL); 1749 sysctl_createv(clog, 0, NULL, NULL, 1750 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1751 CTLTYPE_INT, "sourcecheck_logint", NULL, 1752 NULL, 0, &?, 0, 1753 CTL_NET, PF_INET6, IPPROTO_IPV6, 1754 IPV6CTL_SOURCECHECK_LOGINT, CTL_EOL); 1755 #endif 1756 sysctl_createv(clog, 0, NULL, NULL, 1757 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1758 CTLTYPE_INT, "accept_rtadv", 1759 SYSCTL_DESCR("Accept router advertisements"), 1760 NULL, 0, &ip6_accept_rtadv, 0, 1761 CTL_NET, PF_INET6, IPPROTO_IPV6, 1762 IPV6CTL_ACCEPT_RTADV, CTL_EOL); 1763 sysctl_createv(clog, 0, NULL, NULL, 1764 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1765 CTLTYPE_INT, "rtadv_maxroutes", 1766 SYSCTL_DESCR("Maximum number of routes accepted via router advertisements"), 1767 NULL, 0, &ip6_rtadv_maxroutes, 0, 1768 CTL_NET, PF_INET6, IPPROTO_IPV6, 1769 IPV6CTL_RTADV_MAXROUTES, CTL_EOL); 1770 sysctl_createv(clog, 0, NULL, NULL, 1771 CTLFLAG_PERMANENT, 1772 CTLTYPE_INT, "rtadv_numroutes", 1773 SYSCTL_DESCR("Current number of routes accepted via router advertisements"), 1774 NULL, 0, &nd6_numroutes, 0, 1775 CTL_NET, PF_INET6, IPPROTO_IPV6, 1776 IPV6CTL_RTADV_NUMROUTES, CTL_EOL); 1777 sysctl_createv(clog, 0, NULL, NULL, 1778 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1779 CTLTYPE_INT, "keepfaith", 1780 SYSCTL_DESCR("Activate faith interface"), 1781 NULL, 0, &ip6_keepfaith, 0, 1782 CTL_NET, PF_INET6, IPPROTO_IPV6, 1783 IPV6CTL_KEEPFAITH, CTL_EOL); 1784 sysctl_createv(clog, 0, NULL, NULL, 1785 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1786 CTLTYPE_INT, "log_interval", 1787 SYSCTL_DESCR("Minumum interval between logging " 1788 "unroutable packets"), 1789 NULL, 0, &ip6_log_interval, 0, 1790 CTL_NET, PF_INET6, IPPROTO_IPV6, 1791 IPV6CTL_LOG_INTERVAL, CTL_EOL); 1792 sysctl_createv(clog, 0, NULL, NULL, 1793 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1794 CTLTYPE_INT, "hdrnestlimit", 1795 SYSCTL_DESCR("Maximum number of nested IPv6 headers"), 1796 NULL, 0, &ip6_hdrnestlimit, 0, 1797 CTL_NET, PF_INET6, IPPROTO_IPV6, 1798 IPV6CTL_HDRNESTLIMIT, CTL_EOL); 1799 sysctl_createv(clog, 0, NULL, NULL, 1800 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1801 CTLTYPE_INT, "dad_count", 1802 SYSCTL_DESCR("Number of Duplicate Address Detection " 1803 "probes to send"), 1804 NULL, 0, &ip6_dad_count, 0, 1805 CTL_NET, PF_INET6, IPPROTO_IPV6, 1806 IPV6CTL_DAD_COUNT, CTL_EOL); 1807 sysctl_createv(clog, 0, NULL, NULL, 1808 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1809 CTLTYPE_INT, "auto_flowlabel", 1810 SYSCTL_DESCR("Assign random IPv6 flow labels"), 1811 NULL, 0, &ip6_auto_flowlabel, 0, 1812 CTL_NET, PF_INET6, IPPROTO_IPV6, 1813 IPV6CTL_AUTO_FLOWLABEL, CTL_EOL); 1814 sysctl_createv(clog, 0, NULL, NULL, 1815 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1816 CTLTYPE_INT, "defmcasthlim", 1817 SYSCTL_DESCR("Default multicast hop limit"), 1818 NULL, 0, &ip6_defmcasthlim, 0, 1819 CTL_NET, PF_INET6, IPPROTO_IPV6, 1820 IPV6CTL_DEFMCASTHLIM, CTL_EOL); 1821 #if NGIF > 0 1822 sysctl_createv(clog, 0, NULL, NULL, 1823 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1824 CTLTYPE_INT, "gifhlim", 1825 SYSCTL_DESCR("Default hop limit for a gif tunnel datagram"), 1826 NULL, 0, &ip6_gif_hlim, 0, 1827 CTL_NET, PF_INET6, IPPROTO_IPV6, 1828 IPV6CTL_GIF_HLIM, CTL_EOL); 1829 #endif /* NGIF */ 1830 sysctl_createv(clog, 0, NULL, NULL, 1831 CTLFLAG_PERMANENT, 1832 CTLTYPE_STRING, "kame_version", 1833 SYSCTL_DESCR("KAME Version"), 1834 NULL, 0, __UNCONST(__KAME_VERSION), 0, 1835 CTL_NET, PF_INET6, IPPROTO_IPV6, 1836 IPV6CTL_KAME_VERSION, CTL_EOL); 1837 sysctl_createv(clog, 0, NULL, NULL, 1838 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1839 CTLTYPE_INT, "use_deprecated", 1840 SYSCTL_DESCR("Allow use of deprecated addresses as " 1841 "source addresses"), 1842 NULL, 0, &ip6_use_deprecated, 0, 1843 CTL_NET, PF_INET6, IPPROTO_IPV6, 1844 IPV6CTL_USE_DEPRECATED, CTL_EOL); 1845 sysctl_createv(clog, 0, NULL, NULL, 1846 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1847 CTLTYPE_INT, "rr_prune", NULL, 1848 NULL, 0, &ip6_rr_prune, 0, 1849 CTL_NET, PF_INET6, IPPROTO_IPV6, 1850 IPV6CTL_RR_PRUNE, CTL_EOL); 1851 sysctl_createv(clog, 0, NULL, NULL, 1852 CTLFLAG_PERMANENT 1853 #ifndef INET6_BINDV6ONLY 1854 |CTLFLAG_READWRITE, 1855 #endif 1856 CTLTYPE_INT, "v6only", 1857 SYSCTL_DESCR("Disallow PF_INET6 sockets from connecting " 1858 "to PF_INET sockets"), 1859 NULL, 0, &ip6_v6only, 0, 1860 CTL_NET, PF_INET6, IPPROTO_IPV6, 1861 IPV6CTL_V6ONLY, CTL_EOL); 1862 sysctl_createv(clog, 0, NULL, NULL, 1863 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1864 CTLTYPE_INT, "anonportmin", 1865 SYSCTL_DESCR("Lowest ephemeral port number to assign"), 1866 sysctl_net_inet_ip_ports, 0, &ip6_anonportmin, 0, 1867 CTL_NET, PF_INET6, IPPROTO_IPV6, 1868 IPV6CTL_ANONPORTMIN, CTL_EOL); 1869 sysctl_createv(clog, 0, NULL, NULL, 1870 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1871 CTLTYPE_INT, "anonportmax", 1872 SYSCTL_DESCR("Highest ephemeral port number to assign"), 1873 sysctl_net_inet_ip_ports, 0, &ip6_anonportmax, 0, 1874 CTL_NET, PF_INET6, IPPROTO_IPV6, 1875 IPV6CTL_ANONPORTMAX, CTL_EOL); 1876 #ifndef IPNOPRIVPORTS 1877 sysctl_createv(clog, 0, NULL, NULL, 1878 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1879 CTLTYPE_INT, "lowportmin", 1880 SYSCTL_DESCR("Lowest privileged ephemeral port number " 1881 "to assign"), 1882 sysctl_net_inet_ip_ports, 0, &ip6_lowportmin, 0, 1883 CTL_NET, PF_INET6, IPPROTO_IPV6, 1884 IPV6CTL_LOWPORTMIN, CTL_EOL); 1885 sysctl_createv(clog, 0, NULL, NULL, 1886 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1887 CTLTYPE_INT, "lowportmax", 1888 SYSCTL_DESCR("Highest privileged ephemeral port number " 1889 "to assign"), 1890 sysctl_net_inet_ip_ports, 0, &ip6_lowportmax, 0, 1891 CTL_NET, PF_INET6, IPPROTO_IPV6, 1892 IPV6CTL_LOWPORTMAX, CTL_EOL); 1893 #endif /* IPNOPRIVPORTS */ 1894 sysctl_createv(clog, 0, NULL, NULL, 1895 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1896 CTLTYPE_INT, "use_tempaddr", 1897 SYSCTL_DESCR("Use temporary address"), 1898 NULL, 0, &ip6_use_tempaddr, 0, 1899 CTL_NET, PF_INET6, IPPROTO_IPV6, 1900 CTL_CREATE, CTL_EOL); 1901 sysctl_createv(clog, 0, NULL, NULL, 1902 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1903 CTLTYPE_INT, "temppltime", 1904 SYSCTL_DESCR("preferred lifetime of a temporary address"), 1905 NULL, 0, &ip6_temp_preferred_lifetime, 0, 1906 CTL_NET, PF_INET6, IPPROTO_IPV6, 1907 CTL_CREATE, CTL_EOL); 1908 sysctl_createv(clog, 0, NULL, NULL, 1909 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1910 CTLTYPE_INT, "tempvltime", 1911 SYSCTL_DESCR("valid lifetime of a temporary address"), 1912 NULL, 0, &ip6_temp_valid_lifetime, 0, 1913 CTL_NET, PF_INET6, IPPROTO_IPV6, 1914 CTL_CREATE, CTL_EOL); 1915 sysctl_createv(clog, 0, NULL, NULL, 1916 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1917 CTLTYPE_INT, "maxfrags", 1918 SYSCTL_DESCR("Maximum fragments in reassembly queue"), 1919 NULL, 0, &ip6_maxfrags, 0, 1920 CTL_NET, PF_INET6, IPPROTO_IPV6, 1921 IPV6CTL_MAXFRAGS, CTL_EOL); 1922 sysctl_createv(clog, 0, NULL, NULL, 1923 CTLFLAG_PERMANENT, 1924 CTLTYPE_STRUCT, "stats", 1925 SYSCTL_DESCR("IPv6 statistics"), 1926 sysctl_net_inet6_ip6_stats, 0, NULL, 0, 1927 CTL_NET, PF_INET6, IPPROTO_IPV6, 1928 IPV6CTL_STATS, CTL_EOL); 1929 sysctl_createv(clog, 0, NULL, NULL, 1930 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1931 CTLTYPE_INT, "use_defaultzone", 1932 SYSCTL_DESCR("Whether to use the default scope zones"), 1933 NULL, 0, &ip6_use_defzone, 0, 1934 CTL_NET, PF_INET6, IPPROTO_IPV6, 1935 IPV6CTL_USE_DEFAULTZONE, CTL_EOL); 1936 sysctl_createv(clog, 0, NULL, NULL, 1937 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1938 CTLTYPE_INT, "mcast_pmtu", 1939 SYSCTL_DESCR("Enable pMTU discovery for multicast packet"), 1940 NULL, 0, &ip6_mcast_pmtu, 0, 1941 CTL_NET, PF_INET6, IPPROTO_IPV6, 1942 CTL_CREATE, CTL_EOL); 1943 #ifdef GATEWAY 1944 sysctl_createv(clog, 0, NULL, NULL, 1945 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1946 CTLTYPE_INT, "maxflows", 1947 SYSCTL_DESCR("Number of flows for fast forwarding (IPv6)"), 1948 sysctl_net_inet6_ip6_maxflows, 0, &ip6_maxflows, 0, 1949 CTL_NET, PF_INET6, IPPROTO_IPV6, 1950 CTL_CREATE, CTL_EOL); 1951 sysctl_createv(clog, 0, NULL, NULL, 1952 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1953 CTLTYPE_INT, "hashsize", 1954 SYSCTL_DESCR("Size of hash table for fast forwarding (IPv6)"), 1955 sysctl_net_inet6_ip6_hashsize, 0, &ip6_hashsize, 0, 1956 CTL_NET, PF_INET6, IPPROTO_IPV6, 1957 CTL_CREATE, CTL_EOL); 1958 #endif 1959 } 1960 1961 void 1962 ip6_statinc(u_int stat) 1963 { 1964 1965 KASSERT(stat < IP6_NSTATS); 1966 IP6_STATINC(stat); 1967 } 1968
Indexes created Tue Sep 23 23:09:58 GMT 2025