1 /* $NetBSD: ip6_input.c,v 1.116 2008/04/15 03:57:04 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 1.116 2008/04/15 03:57:04 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 #endif 115 116 #ifdef FAST_IPSEC 117 #include <netipsec/ipsec.h> 118 #include <netipsec/ipsec6.h> 119 #include <netipsec/key.h> 120 #endif /* FAST_IPSEC */ 121 122 #include <netinet6/ip6protosw.h> 123 124 #include "faith.h" 125 #include "gif.h" 126 127 #if NGIF > 0 128 #include <netinet6/in6_gif.h> 129 #endif 130 131 #include <net/net_osdep.h> 132 133 extern struct domain inet6domain; 134 135 u_char ip6_protox[IPPROTO_MAX]; 136 static int ip6qmaxlen = IFQ_MAXLEN; 137 struct in6_ifaddr *in6_ifaddr; 138 struct ifqueue ip6intrq; 139 140 extern callout_t in6_tmpaddrtimer_ch; 141 142 int ip6_forward_srcrt; /* XXX */ 143 int ip6_sourcecheck; /* XXX */ 144 int ip6_sourcecheck_interval; /* XXX */ 145 146 #ifdef PFIL_HOOKS 147 struct pfil_head inet6_pfil_hook; 148 #endif 149 150 percpu_t *ip6stat_percpu; 151 152 static void ip6_init2(void *); 153 static struct m_tag *ip6_setdstifaddr(struct mbuf *, const struct in6_ifaddr *); 154 155 static int ip6_hopopts_input(u_int32_t *, u_int32_t *, struct mbuf **, int *); 156 static struct mbuf *ip6_pullexthdr(struct mbuf *, size_t, int); 157 158 /* 159 * IP6 initialization: fill in IP6 protocol switch table. 160 * All protocols not implemented in kernel go to raw IP6 protocol handler. 161 */ 162 void 163 ip6_init(void) 164 { 165 const struct ip6protosw *pr; 166 int i; 167 168 pr = (const struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 169 if (pr == 0) 170 panic("ip6_init"); 171 for (i = 0; i < IPPROTO_MAX; i++) 172 ip6_protox[i] = pr - inet6sw; 173 for (pr = (const struct ip6protosw *)inet6domain.dom_protosw; 174 pr < (const struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++) 175 if (pr->pr_domain->dom_family == PF_INET6 && 176 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) 177 ip6_protox[pr->pr_protocol] = pr - inet6sw; 178 ip6intrq.ifq_maxlen = ip6qmaxlen; 179 scope6_init(); 180 addrsel_policy_init(); 181 nd6_init(); 182 frag6_init(); 183 ip6_desync_factor = arc4random() % MAX_TEMP_DESYNC_FACTOR; 184 185 ip6_init2((void *)0); 186 #ifdef GATEWAY 187 ip6flow_init(ip6_hashsize); 188 #endif 189 190 #ifdef PFIL_HOOKS 191 /* Register our Packet Filter hook. */ 192 inet6_pfil_hook.ph_type = PFIL_TYPE_AF; 193 inet6_pfil_hook.ph_af = AF_INET6; 194 i = pfil_head_register(&inet6_pfil_hook); 195 if (i != 0) 196 printf("ip6_init: WARNING: unable to register pfil hook, " 197 "error %d\n", i); 198 #endif /* PFIL_HOOKS */ 199 200 ip6stat_percpu = percpu_alloc(sizeof(uint64_t) * IP6_NSTATS); 201 } 202 203 static void 204 ip6_init2(void *dummy) 205 { 206 207 /* nd6_timer_init */ 208 callout_init(&nd6_timer_ch, 0); 209 callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL); 210 211 /* timer for regeneranation of temporary addresses randomize ID */ 212 callout_init(&in6_tmpaddrtimer_ch, 0); 213 callout_reset(&in6_tmpaddrtimer_ch, 214 (ip6_temp_preferred_lifetime - ip6_desync_factor - 215 ip6_temp_regen_advance) * hz, 216 in6_tmpaddrtimer, NULL); 217 } 218 219 /* 220 * IP6 input interrupt handling. Just pass the packet to ip6_input. 221 */ 222 void 223 ip6intr(void) 224 { 225 int s; 226 struct mbuf *m; 227 228 for (;;) { 229 s = splnet(); 230 IF_DEQUEUE(&ip6intrq, m); 231 splx(s); 232 if (m == 0) 233 return; 234 /* drop the packet if IPv6 operation is disabled on the IF */ 235 if ((ND_IFINFO(m->m_pkthdr.rcvif)->flags & ND6_IFF_IFDISABLED)) { 236 m_freem(m); 237 return; 238 } 239 ip6_input(m); 240 } 241 } 242 243 extern struct route ip6_forward_rt; 244 245 void 246 ip6_input(struct mbuf *m) 247 { 248 struct ip6_hdr *ip6; 249 int hit, off = sizeof(struct ip6_hdr), nest; 250 u_int32_t plen; 251 u_int32_t rtalert = ~0; 252 int nxt, ours = 0, rh_present = 0; 253 struct ifnet *deliverifp = NULL; 254 int srcrt = 0; 255 const struct rtentry *rt; 256 union { 257 struct sockaddr dst; 258 struct sockaddr_in6 dst6; 259 } u; 260 #ifdef FAST_IPSEC 261 struct m_tag *mtag; 262 struct tdb_ident *tdbi; 263 struct secpolicy *sp; 264 int s, error; 265 #endif 266 267 #ifdef IPSEC 268 /* 269 * should the inner packet be considered authentic? 270 * see comment in ah4_input(). 271 */ 272 m->m_flags &= ~M_AUTHIPHDR; 273 m->m_flags &= ~M_AUTHIPDGM; 274 #endif 275 276 /* 277 * make sure we don't have onion peering information into m_tag. 278 */ 279 ip6_delaux(m); 280 281 /* 282 * mbuf statistics 283 */ 284 if (m->m_flags & M_EXT) { 285 if (m->m_next) 286 IP6_STATINC(IP6_STAT_MEXT2M); 287 else 288 IP6_STATINC(IP6_STAT_MEXT1); 289 } else { 290 #define M2MMAX 32 291 if (m->m_next) { 292 if (m->m_flags & M_LOOP) { 293 /*XXX*/ IP6_STATINC(IP6_STAT_M2M + lo0ifp->if_index); 294 } else if (m->m_pkthdr.rcvif->if_index < M2MMAX) { 295 IP6_STATINC(IP6_STAT_M2M + 296 m->m_pkthdr.rcvif->if_index); 297 } else 298 IP6_STATINC(IP6_STAT_M2M); 299 } else 300 IP6_STATINC(IP6_STAT_M1); 301 #undef M2MMAX 302 } 303 304 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive); 305 IP6_STATINC(IP6_STAT_TOTAL); 306 307 /* 308 * If the IPv6 header is not aligned, slurp it up into a new 309 * mbuf with space for link headers, in the event we forward 310 * it. Otherwise, if it is aligned, make sure the entire base 311 * IPv6 header is in the first mbuf of the chain. 312 */ 313 if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 314 struct ifnet *inifp = m->m_pkthdr.rcvif; 315 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 316 (max_linkhdr + 3) & ~3)) == NULL) { 317 /* XXXJRT new stat, please */ 318 IP6_STATINC(IP6_STAT_TOOSMALL); 319 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 320 return; 321 } 322 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 323 struct ifnet *inifp = m->m_pkthdr.rcvif; 324 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 325 IP6_STATINC(IP6_STAT_TOOSMALL); 326 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 327 return; 328 } 329 } 330 331 ip6 = mtod(m, struct ip6_hdr *); 332 333 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 334 IP6_STATINC(IP6_STAT_BADVERS); 335 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 336 goto bad; 337 } 338 339 #if defined(IPSEC) 340 /* IPv6 fast forwarding is not compatible with IPsec. */ 341 m->m_flags &= ~M_CANFASTFWD; 342 #else 343 /* 344 * Assume that we can create a fast-forward IP flow entry 345 * based on this packet. 346 */ 347 m->m_flags |= M_CANFASTFWD; 348 #endif 349 350 #ifdef PFIL_HOOKS 351 /* 352 * Run through list of hooks for input packets. If there are any 353 * filters which require that additional packets in the flow are 354 * not fast-forwarded, they must clear the M_CANFASTFWD flag. 355 * Note that filters must _never_ set this flag, as another filter 356 * in the list may have previously cleared it. 357 */ 358 /* 359 * let ipfilter look at packet on the wire, 360 * not the decapsulated packet. 361 */ 362 #ifdef IPSEC 363 if (!ipsec_getnhist(m)) 364 #elif defined(FAST_IPSEC) 365 if (!ipsec_indone(m)) 366 #else 367 if (1) 368 #endif 369 { 370 struct in6_addr odst; 371 372 odst = ip6->ip6_dst; 373 if (pfil_run_hooks(&inet6_pfil_hook, &m, m->m_pkthdr.rcvif, 374 PFIL_IN) != 0) 375 return; 376 if (m == NULL) 377 return; 378 ip6 = mtod(m, struct ip6_hdr *); 379 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst); 380 } 381 #endif /* PFIL_HOOKS */ 382 383 IP6_STATINC(IP6_STAT_NXTHIST + ip6->ip6_nxt); 384 385 #ifdef ALTQ 386 if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) { 387 /* packet is dropped by traffic conditioner */ 388 return; 389 } 390 #endif 391 392 /* 393 * Check against address spoofing/corruption. 394 */ 395 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) || 396 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) { 397 /* 398 * XXX: "badscope" is not very suitable for a multicast source. 399 */ 400 IP6_STATINC(IP6_STAT_BADSCOPE); 401 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 402 goto bad; 403 } 404 /* 405 * The following check is not documented in specs. A malicious 406 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack 407 * and bypass security checks (act as if it was from 127.0.0.1 by using 408 * IPv6 src ::ffff:127.0.0.1). Be cautious. 409 * 410 * This check chokes if we are in an SIIT cloud. As none of BSDs 411 * support IPv4-less kernel compilation, we cannot support SIIT 412 * environment at all. So, it makes more sense for us to reject any 413 * malicious packets for non-SIIT environment, than try to do a 414 * partial support for SIIT environment. 415 */ 416 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 417 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 418 IP6_STATINC(IP6_STAT_BADSCOPE); 419 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 420 goto bad; 421 } 422 #if 0 423 /* 424 * Reject packets with IPv4 compatible addresses (auto tunnel). 425 * 426 * The code forbids auto tunnel relay case in RFC1933 (the check is 427 * stronger than RFC1933). We may want to re-enable it if mech-xx 428 * is revised to forbid relaying case. 429 */ 430 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) || 431 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) { 432 IP6_STATINC(IP6_STAT_BADSCOPE); 433 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 434 goto bad; 435 } 436 #endif 437 438 /* 439 * Disambiguate address scope zones (if there is ambiguity). 440 * We first make sure that the original source or destination address 441 * is not in our internal form for scoped addresses. Such addresses 442 * are not necessarily invalid spec-wise, but we cannot accept them due 443 * to the usage conflict. 444 * in6_setscope() then also checks and rejects the cases where src or 445 * dst are the loopback address and the receiving interface 446 * is not loopback. 447 */ 448 if (__predict_false( 449 m_makewritable(&m, 0, sizeof(struct ip6_hdr), M_DONTWAIT))) 450 goto bad; 451 ip6 = mtod(m, struct ip6_hdr *); 452 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) { 453 IP6_STATINC(IP6_STAT_BADSCOPE); /* XXX */ 454 goto bad; 455 } 456 if (in6_setscope(&ip6->ip6_src, m->m_pkthdr.rcvif, NULL) || 457 in6_setscope(&ip6->ip6_dst, m->m_pkthdr.rcvif, NULL)) { 458 IP6_STATINC(IP6_STAT_BADSCOPE); 459 goto bad; 460 } 461 462 /* 463 * Multicast check 464 */ 465 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 466 struct in6_multi *in6m = 0; 467 468 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast); 469 /* 470 * See if we belong to the destination multicast group on the 471 * arrival interface. 472 */ 473 IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m); 474 if (in6m) 475 ours = 1; 476 else if (!ip6_mrouter) { 477 uint64_t *ip6s = IP6_STAT_GETREF(); 478 ip6s[IP6_STAT_NOTMEMBER]++; 479 ip6s[IP6_STAT_CANTFORWARD]++; 480 IP6_STAT_PUTREF(); 481 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 482 goto bad; 483 } 484 deliverifp = m->m_pkthdr.rcvif; 485 goto hbhcheck; 486 } 487 488 sockaddr_in6_init(&u.dst6, &ip6->ip6_dst, 0, 0, 0); 489 490 /* 491 * Unicast check 492 */ 493 rt = rtcache_lookup2(&ip6_forward_rt, &u.dst, 1, &hit); 494 if (hit) 495 IP6_STATINC(IP6_STAT_FORWARD_CACHEHIT); 496 else 497 IP6_STATINC(IP6_STAT_FORWARD_CACHEMISS); 498 499 #define rt6_getkey(__rt) satocsin6(rt_getkey(__rt)) 500 501 /* 502 * Accept the packet if the forwarding interface to the destination 503 * according to the routing table is the loopback interface, 504 * unless the associated route has a gateway. 505 * Note that this approach causes to accept a packet if there is a 506 * route to the loopback interface for the destination of the packet. 507 * But we think it's even useful in some situations, e.g. when using 508 * a special daemon which wants to intercept the packet. 509 */ 510 if (rt != NULL && 511 (rt->rt_flags & (RTF_HOST|RTF_GATEWAY)) == RTF_HOST && 512 !(rt->rt_flags & RTF_CLONED) && 513 #if 0 514 /* 515 * The check below is redundant since the comparison of 516 * the destination and the key of the rtentry has 517 * already done through looking up the routing table. 518 */ 519 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &rt6_getkey(rt)->sin6_addr) && 520 #endif 521 rt->rt_ifp->if_type == IFT_LOOP) { 522 struct in6_ifaddr *ia6 = (struct in6_ifaddr *)rt->rt_ifa; 523 if (ia6->ia6_flags & IN6_IFF_ANYCAST) 524 m->m_flags |= M_ANYCAST6; 525 /* 526 * packets to a tentative, duplicated, or somehow invalid 527 * address must not be accepted. 528 */ 529 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) { 530 /* this address is ready */ 531 ours = 1; 532 deliverifp = ia6->ia_ifp; /* correct? */ 533 goto hbhcheck; 534 } else { 535 /* address is not ready, so discard the packet. */ 536 nd6log((LOG_INFO, 537 "ip6_input: packet to an unready address %s->%s\n", 538 ip6_sprintf(&ip6->ip6_src), 539 ip6_sprintf(&ip6->ip6_dst))); 540 541 goto bad; 542 } 543 } 544 545 /* 546 * FAITH (Firewall Aided Internet Translator) 547 */ 548 #if defined(NFAITH) && 0 < NFAITH 549 if (ip6_keepfaith) { 550 if (rt != NULL && rt->rt_ifp != NULL && 551 rt->rt_ifp->if_type == IFT_FAITH) { 552 /* XXX do we need more sanity checks? */ 553 ours = 1; 554 deliverifp = rt->rt_ifp; /* faith */ 555 goto hbhcheck; 556 } 557 } 558 #endif 559 560 #if 0 561 { 562 /* 563 * Last resort: check in6_ifaddr for incoming interface. 564 * The code is here until I update the "goto ours hack" code above 565 * working right. 566 */ 567 struct ifaddr *ifa; 568 IFADDR_FOREACH(ifa, m->m_pkthdr.rcvif) { 569 if (ifa->ifa_addr == NULL) 570 continue; /* just for safety */ 571 if (ifa->ifa_addr->sa_family != AF_INET6) 572 continue; 573 if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) { 574 ours = 1; 575 deliverifp = ifa->ifa_ifp; 576 goto hbhcheck; 577 } 578 } 579 } 580 #endif 581 582 /* 583 * Now there is no reason to process the packet if it's not our own 584 * and we're not a router. 585 */ 586 if (!ip6_forwarding) { 587 IP6_STATINC(IP6_STAT_CANTFORWARD); 588 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 589 goto bad; 590 } 591 592 hbhcheck: 593 /* 594 * record address information into m_tag, if we don't have one yet. 595 * note that we are unable to record it, if the address is not listed 596 * as our interface address (e.g. multicast addresses, addresses 597 * within FAITH prefixes and such). 598 */ 599 if (deliverifp && ip6_getdstifaddr(m) == NULL) { 600 struct in6_ifaddr *ia6; 601 602 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 603 if (ia6 != NULL && ip6_setdstifaddr(m, ia6) == NULL) { 604 /* 605 * XXX maybe we should drop the packet here, 606 * as we could not provide enough information 607 * to the upper layers. 608 */ 609 } 610 } 611 612 /* 613 * Process Hop-by-Hop options header if it's contained. 614 * m may be modified in ip6_hopopts_input(). 615 * If a JumboPayload option is included, plen will also be modified. 616 */ 617 plen = (u_int32_t)ntohs(ip6->ip6_plen); 618 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 619 struct ip6_hbh *hbh; 620 621 if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) { 622 #if 0 /*touches NULL pointer*/ 623 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 624 #endif 625 return; /* m have already been freed */ 626 } 627 628 /* adjust pointer */ 629 ip6 = mtod(m, struct ip6_hdr *); 630 631 /* 632 * if the payload length field is 0 and the next header field 633 * indicates Hop-by-Hop Options header, then a Jumbo Payload 634 * option MUST be included. 635 */ 636 if (ip6->ip6_plen == 0 && plen == 0) { 637 /* 638 * Note that if a valid jumbo payload option is 639 * contained, ip6_hopopts_input() must set a valid 640 * (non-zero) payload length to the variable plen. 641 */ 642 IP6_STATINC(IP6_STAT_BADOPTIONS); 643 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 644 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 645 icmp6_error(m, ICMP6_PARAM_PROB, 646 ICMP6_PARAMPROB_HEADER, 647 (char *)&ip6->ip6_plen - (char *)ip6); 648 return; 649 } 650 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 651 sizeof(struct ip6_hbh)); 652 if (hbh == NULL) { 653 IP6_STATINC(IP6_STAT_TOOSHORT); 654 return; 655 } 656 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 657 nxt = hbh->ip6h_nxt; 658 659 /* 660 * accept the packet if a router alert option is included 661 * and we act as an IPv6 router. 662 */ 663 if (rtalert != ~0 && ip6_forwarding) 664 ours = 1; 665 } else 666 nxt = ip6->ip6_nxt; 667 668 /* 669 * Check that the amount of data in the buffers 670 * is as at least much as the IPv6 header would have us expect. 671 * Trim mbufs if longer than we expect. 672 * Drop packet if shorter than we expect. 673 */ 674 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 675 IP6_STATINC(IP6_STAT_TOOSHORT); 676 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 677 goto bad; 678 } 679 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 680 if (m->m_len == m->m_pkthdr.len) { 681 m->m_len = sizeof(struct ip6_hdr) + plen; 682 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 683 } else 684 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 685 } 686 687 /* 688 * Forward if desirable. 689 */ 690 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 691 /* 692 * If we are acting as a multicast router, all 693 * incoming multicast packets are passed to the 694 * kernel-level multicast forwarding function. 695 * The packet is returned (relatively) intact; if 696 * ip6_mforward() returns a non-zero value, the packet 697 * must be discarded, else it may be accepted below. 698 */ 699 if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) { 700 IP6_STATINC(IP6_STAT_CANTFORWARD); 701 m_freem(m); 702 return; 703 } 704 if (!ours) { 705 m_freem(m); 706 return; 707 } 708 } else if (!ours) { 709 ip6_forward(m, srcrt); 710 return; 711 } 712 713 ip6 = mtod(m, struct ip6_hdr *); 714 715 /* 716 * Malicious party may be able to use IPv4 mapped addr to confuse 717 * tcp/udp stack and bypass security checks (act as if it was from 718 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious. 719 * 720 * For SIIT end node behavior, you may want to disable the check. 721 * However, you will become vulnerable to attacks using IPv4 mapped 722 * source. 723 */ 724 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 725 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 726 IP6_STATINC(IP6_STAT_BADSCOPE); 727 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 728 goto bad; 729 } 730 731 /* 732 * Tell launch routine the next header 733 */ 734 #ifdef IFA_STATS 735 if (deliverifp != NULL) { 736 struct in6_ifaddr *ia6; 737 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 738 if (ia6) 739 ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len; 740 } 741 #endif 742 IP6_STATINC(IP6_STAT_DELIVERED); 743 in6_ifstat_inc(deliverifp, ifs6_in_deliver); 744 nest = 0; 745 746 rh_present = 0; 747 while (nxt != IPPROTO_DONE) { 748 if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) { 749 IP6_STATINC(IP6_STAT_TOOMANYHDR); 750 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 751 goto bad; 752 } 753 754 /* 755 * protection against faulty packet - there should be 756 * more sanity checks in header chain processing. 757 */ 758 if (m->m_pkthdr.len < off) { 759 IP6_STATINC(IP6_STAT_TOOSHORT); 760 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 761 goto bad; 762 } 763 764 if (nxt == IPPROTO_ROUTING) { 765 if (rh_present++) { 766 in6_ifstat_inc(m->m_pkthdr.rcvif, 767 ifs6_in_hdrerr); 768 IP6_STATINC(IP6_STAT_BADOPTIONS); 769 goto bad; 770 } 771 } 772 773 #ifdef IPSEC 774 /* 775 * enforce IPsec policy checking if we are seeing last header. 776 * note that we do not visit this with protocols with pcb layer 777 * code - like udp/tcp/raw ip. 778 */ 779 if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 && 780 ipsec6_in_reject(m, NULL)) { 781 ipsec6stat.in_polvio++; 782 goto bad; 783 } 784 #endif 785 #ifdef FAST_IPSEC 786 /* 787 * enforce IPsec policy checking if we are seeing last header. 788 * note that we do not visit this with protocols with pcb layer 789 * code - like udp/tcp/raw ip. 790 */ 791 if ((inet6sw[ip_protox[nxt]].pr_flags & PR_LASTHDR) != 0) { 792 /* 793 * Check if the packet has already had IPsec processing 794 * done. If so, then just pass it along. This tag gets 795 * set during AH, ESP, etc. input handling, before the 796 * packet is returned to the ip input queue for delivery. 797 */ 798 mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL); 799 s = splsoftnet(); 800 if (mtag != NULL) { 801 tdbi = (struct tdb_ident *)(mtag + 1); 802 sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND); 803 } else { 804 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, 805 IP_FORWARDING, &error); 806 } 807 if (sp != NULL) { 808 /* 809 * Check security policy against packet attributes. 810 */ 811 error = ipsec_in_reject(sp, m); 812 KEY_FREESP(&sp); 813 } else { 814 /* XXX error stat??? */ 815 error = EINVAL; 816 DPRINTF(("ip6_input: no SP, packet discarded\n"));/*XXX*/ 817 } 818 splx(s); 819 if (error) 820 goto bad; 821 } 822 #endif /* FAST_IPSEC */ 823 824 825 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt); 826 } 827 return; 828 bad: 829 m_freem(m); 830 } 831 832 /* 833 * set/grab in6_ifaddr correspond to IPv6 destination address. 834 */ 835 static struct m_tag * 836 ip6_setdstifaddr(struct mbuf *m, const struct in6_ifaddr *ia) 837 { 838 struct m_tag *mtag; 839 840 mtag = ip6_addaux(m); 841 if (mtag != NULL) { 842 struct ip6aux *ip6a; 843 844 ip6a = (struct ip6aux *)(mtag + 1); 845 in6_setscope(&ip6a->ip6a_src, ia->ia_ifp, &ip6a->ip6a_scope_id); 846 ip6a->ip6a_src = ia->ia_addr.sin6_addr; 847 ip6a->ip6a_flags = ia->ia6_flags; 848 } 849 return mtag; /* NULL if failed to set */ 850 } 851 852 const struct ip6aux * 853 ip6_getdstifaddr(struct mbuf *m) 854 { 855 struct m_tag *mtag; 856 857 mtag = ip6_findaux(m); 858 if (mtag != NULL) 859 return (struct ip6aux *)(mtag + 1); 860 else 861 return NULL; 862 } 863 864 /* 865 * Hop-by-Hop options header processing. If a valid jumbo payload option is 866 * included, the real payload length will be stored in plenp. 867 * 868 * rtalertp - XXX: should be stored more smart way 869 */ 870 static int 871 ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp, 872 struct mbuf **mp, int *offp) 873 { 874 struct mbuf *m = *mp; 875 int off = *offp, hbhlen; 876 struct ip6_hbh *hbh; 877 878 /* validation of the length of the header */ 879 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, 880 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh)); 881 if (hbh == NULL) { 882 IP6_STATINC(IP6_STAT_TOOSHORT); 883 return -1; 884 } 885 hbhlen = (hbh->ip6h_len + 1) << 3; 886 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 887 hbhlen); 888 if (hbh == NULL) { 889 IP6_STATINC(IP6_STAT_TOOSHORT); 890 return -1; 891 } 892 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 893 off += hbhlen; 894 hbhlen -= sizeof(struct ip6_hbh); 895 896 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 897 hbhlen, rtalertp, plenp) < 0) 898 return (-1); 899 900 *offp = off; 901 *mp = m; 902 return (0); 903 } 904 905 /* 906 * Search header for all Hop-by-hop options and process each option. 907 * This function is separate from ip6_hopopts_input() in order to 908 * handle a case where the sending node itself process its hop-by-hop 909 * options header. In such a case, the function is called from ip6_output(). 910 * 911 * The function assumes that hbh header is located right after the IPv6 header 912 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to 913 * opthead + hbhlen is located in continuous memory region. 914 */ 915 int 916 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen, 917 u_int32_t *rtalertp, u_int32_t *plenp) 918 { 919 struct ip6_hdr *ip6; 920 int optlen = 0; 921 u_int8_t *opt = opthead; 922 u_int16_t rtalert_val; 923 u_int32_t jumboplen; 924 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh); 925 926 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 927 switch (*opt) { 928 case IP6OPT_PAD1: 929 optlen = 1; 930 break; 931 case IP6OPT_PADN: 932 if (hbhlen < IP6OPT_MINLEN) { 933 IP6_STATINC(IP6_STAT_TOOSMALL); 934 goto bad; 935 } 936 optlen = *(opt + 1) + 2; 937 break; 938 case IP6OPT_RTALERT: 939 /* XXX may need check for alignment */ 940 if (hbhlen < IP6OPT_RTALERT_LEN) { 941 IP6_STATINC(IP6_STAT_TOOSMALL); 942 goto bad; 943 } 944 if (*(opt + 1) != IP6OPT_RTALERT_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_RTALERT_LEN; 952 bcopy((void *)(opt + 2), (void *)&rtalert_val, 2); 953 *rtalertp = ntohs(rtalert_val); 954 break; 955 case IP6OPT_JUMBO: 956 /* XXX may need check for alignment */ 957 if (hbhlen < IP6OPT_JUMBO_LEN) { 958 IP6_STATINC(IP6_STAT_TOOSMALL); 959 goto bad; 960 } 961 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) { 962 /* XXX stat */ 963 icmp6_error(m, ICMP6_PARAM_PROB, 964 ICMP6_PARAMPROB_HEADER, 965 erroff + opt + 1 - opthead); 966 return (-1); 967 } 968 optlen = IP6OPT_JUMBO_LEN; 969 970 /* 971 * IPv6 packets that have non 0 payload length 972 * must not contain a jumbo payload option. 973 */ 974 ip6 = mtod(m, struct ip6_hdr *); 975 if (ip6->ip6_plen) { 976 IP6_STATINC(IP6_STAT_BADOPTIONS); 977 icmp6_error(m, ICMP6_PARAM_PROB, 978 ICMP6_PARAMPROB_HEADER, 979 erroff + opt - opthead); 980 return (-1); 981 } 982 983 /* 984 * We may see jumbolen in unaligned location, so 985 * we'd need to perform bcopy(). 986 */ 987 bcopy(opt + 2, &jumboplen, sizeof(jumboplen)); 988 jumboplen = (u_int32_t)htonl(jumboplen); 989 990 #if 1 991 /* 992 * if there are multiple jumbo payload options, 993 * *plenp will be non-zero and the packet will be 994 * rejected. 995 * the behavior may need some debate in ipngwg - 996 * multiple options does not make sense, however, 997 * there's no explicit mention in specification. 998 */ 999 if (*plenp != 0) { 1000 IP6_STATINC(IP6_STAT_BADOPTIONS); 1001 icmp6_error(m, ICMP6_PARAM_PROB, 1002 ICMP6_PARAMPROB_HEADER, 1003 erroff + opt + 2 - opthead); 1004 return (-1); 1005 } 1006 #endif 1007 1008 /* 1009 * jumbo payload length must be larger than 65535. 1010 */ 1011 if (jumboplen <= IPV6_MAXPACKET) { 1012 IP6_STATINC(IP6_STAT_BADOPTIONS); 1013 icmp6_error(m, ICMP6_PARAM_PROB, 1014 ICMP6_PARAMPROB_HEADER, 1015 erroff + opt + 2 - opthead); 1016 return (-1); 1017 } 1018 *plenp = jumboplen; 1019 1020 break; 1021 default: /* unknown option */ 1022 if (hbhlen < IP6OPT_MINLEN) { 1023 IP6_STATINC(IP6_STAT_TOOSMALL); 1024 goto bad; 1025 } 1026 optlen = ip6_unknown_opt(opt, m, 1027 erroff + opt - opthead); 1028 if (optlen == -1) 1029 return (-1); 1030 optlen += 2; 1031 break; 1032 } 1033 } 1034 1035 return (0); 1036 1037 bad: 1038 m_freem(m); 1039 return (-1); 1040 } 1041 1042 /* 1043 * Unknown option processing. 1044 * The third argument `off' is the offset from the IPv6 header to the option, 1045 * which is necessary if the IPv6 header the and option header and IPv6 header 1046 * is not continuous in order to return an ICMPv6 error. 1047 */ 1048 int 1049 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off) 1050 { 1051 struct ip6_hdr *ip6; 1052 1053 switch (IP6OPT_TYPE(*optp)) { 1054 case IP6OPT_TYPE_SKIP: /* ignore the option */ 1055 return ((int)*(optp + 1)); 1056 case IP6OPT_TYPE_DISCARD: /* silently discard */ 1057 m_freem(m); 1058 return (-1); 1059 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 1060 IP6_STATINC(IP6_STAT_BADOPTIONS); 1061 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 1062 return (-1); 1063 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 1064 IP6_STATINC(IP6_STAT_BADOPTIONS); 1065 ip6 = mtod(m, struct ip6_hdr *); 1066 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 1067 (m->m_flags & (M_BCAST|M_MCAST))) 1068 m_freem(m); 1069 else 1070 icmp6_error(m, ICMP6_PARAM_PROB, 1071 ICMP6_PARAMPROB_OPTION, off); 1072 return (-1); 1073 } 1074 1075 m_freem(m); /* XXX: NOTREACHED */ 1076 return (-1); 1077 } 1078 1079 /* 1080 * Create the "control" list for this pcb. 1081 * 1082 * The routine will be called from upper layer handlers like tcp6_input(). 1083 * Thus the routine assumes that the caller (tcp6_input) have already 1084 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the 1085 * very first mbuf on the mbuf chain. 1086 * We may want to add some infinite loop prevention or sanity checks for safety. 1087 * (This applies only when you are using KAME mbuf chain restriction, i.e. 1088 * you are using IP6_EXTHDR_CHECK() not m_pulldown()) 1089 */ 1090 void 1091 ip6_savecontrol(struct in6pcb *in6p, struct mbuf **mp, 1092 struct ip6_hdr *ip6, struct mbuf *m) 1093 { 1094 #ifdef RFC2292 1095 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y)) 1096 #else 1097 #define IS2292(x, y) (y) 1098 #endif 1099 1100 #ifdef SO_TIMESTAMP 1101 if (in6p->in6p_socket->so_options & SO_TIMESTAMP) { 1102 struct timeval tv; 1103 1104 microtime(&tv); 1105 *mp = sbcreatecontrol((void *) &tv, sizeof(tv), 1106 SCM_TIMESTAMP, SOL_SOCKET); 1107 if (*mp) 1108 mp = &(*mp)->m_next; 1109 } 1110 #endif 1111 1112 /* some OSes call this logic with IPv4 packet, for SO_TIMESTAMP */ 1113 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) 1114 return; 1115 1116 /* RFC 2292 sec. 5 */ 1117 if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) { 1118 struct in6_pktinfo pi6; 1119 1120 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr)); 1121 in6_clearscope(&pi6.ipi6_addr); /* XXX */ 1122 pi6.ipi6_ifindex = m->m_pkthdr.rcvif ? 1123 m->m_pkthdr.rcvif->if_index : 0; 1124 *mp = sbcreatecontrol((void *) &pi6, 1125 sizeof(struct in6_pktinfo), 1126 IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6); 1127 if (*mp) 1128 mp = &(*mp)->m_next; 1129 } 1130 1131 if (in6p->in6p_flags & IN6P_HOPLIMIT) { 1132 int hlim = ip6->ip6_hlim & 0xff; 1133 1134 *mp = sbcreatecontrol((void *) &hlim, sizeof(int), 1135 IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6); 1136 if (*mp) 1137 mp = &(*mp)->m_next; 1138 } 1139 1140 if ((in6p->in6p_flags & IN6P_TCLASS) != 0) { 1141 u_int32_t flowinfo; 1142 int tclass; 1143 1144 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK); 1145 flowinfo >>= 20; 1146 1147 tclass = flowinfo & 0xff; 1148 *mp = sbcreatecontrol((void *)&tclass, sizeof(tclass), 1149 IPV6_TCLASS, IPPROTO_IPV6); 1150 1151 if (*mp) 1152 mp = &(*mp)->m_next; 1153 } 1154 1155 /* 1156 * IPV6_HOPOPTS socket option. Recall that we required super-user 1157 * privilege for the option (see ip6_ctloutput), but it might be too 1158 * strict, since there might be some hop-by-hop options which can be 1159 * returned to normal user. 1160 * See also RFC3542 section 8 (or RFC2292 section 6). 1161 */ 1162 if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0) { 1163 /* 1164 * Check if a hop-by-hop options header is contatined in the 1165 * received packet, and if so, store the options as ancillary 1166 * data. Note that a hop-by-hop options header must be 1167 * just after the IPv6 header, which fact is assured through 1168 * the IPv6 input processing. 1169 */ 1170 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1171 if (xip6->ip6_nxt == IPPROTO_HOPOPTS) { 1172 struct ip6_hbh *hbh; 1173 int hbhlen; 1174 struct mbuf *ext; 1175 1176 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr), 1177 xip6->ip6_nxt); 1178 if (ext == NULL) { 1179 IP6_STATINC(IP6_STAT_TOOSHORT); 1180 return; 1181 } 1182 hbh = mtod(ext, struct ip6_hbh *); 1183 hbhlen = (hbh->ip6h_len + 1) << 3; 1184 if (hbhlen != ext->m_len) { 1185 m_freem(ext); 1186 IP6_STATINC(IP6_STAT_TOOSHORT); 1187 return; 1188 } 1189 1190 /* 1191 * XXX: We copy whole the header even if a jumbo 1192 * payload option is included, which option is to 1193 * be removed before returning in the RFC 2292. 1194 * Note: this constraint is removed in RFC3542. 1195 */ 1196 *mp = sbcreatecontrol((void *)hbh, hbhlen, 1197 IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS), 1198 IPPROTO_IPV6); 1199 if (*mp) 1200 mp = &(*mp)->m_next; 1201 m_freem(ext); 1202 } 1203 } 1204 1205 /* IPV6_DSTOPTS and IPV6_RTHDR socket options */ 1206 if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) { 1207 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1208 int nxt = xip6->ip6_nxt, off = sizeof(struct ip6_hdr); 1209 1210 /* 1211 * Search for destination options headers or routing 1212 * header(s) through the header chain, and stores each 1213 * header as ancillary data. 1214 * Note that the order of the headers remains in 1215 * the chain of ancillary data. 1216 */ 1217 for (;;) { /* is explicit loop prevention necessary? */ 1218 struct ip6_ext *ip6e = NULL; 1219 int elen; 1220 struct mbuf *ext = NULL; 1221 1222 /* 1223 * if it is not an extension header, don't try to 1224 * pull it from the chain. 1225 */ 1226 switch (nxt) { 1227 case IPPROTO_DSTOPTS: 1228 case IPPROTO_ROUTING: 1229 case IPPROTO_HOPOPTS: 1230 case IPPROTO_AH: /* is it possible? */ 1231 break; 1232 default: 1233 goto loopend; 1234 } 1235 1236 ext = ip6_pullexthdr(m, off, nxt); 1237 if (ext == NULL) { 1238 IP6_STATINC(IP6_STAT_TOOSHORT); 1239 return; 1240 } 1241 ip6e = mtod(ext, struct ip6_ext *); 1242 if (nxt == IPPROTO_AH) 1243 elen = (ip6e->ip6e_len + 2) << 2; 1244 else 1245 elen = (ip6e->ip6e_len + 1) << 3; 1246 if (elen != ext->m_len) { 1247 m_freem(ext); 1248 IP6_STATINC(IP6_STAT_TOOSHORT); 1249 return; 1250 } 1251 KASSERT(IP6_HDR_ALIGNED_P(ip6e)); 1252 1253 switch (nxt) { 1254 case IPPROTO_DSTOPTS: 1255 if (!in6p->in6p_flags & IN6P_DSTOPTS) 1256 break; 1257 1258 *mp = sbcreatecontrol((void *)ip6e, elen, 1259 IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS), 1260 IPPROTO_IPV6); 1261 if (*mp) 1262 mp = &(*mp)->m_next; 1263 break; 1264 1265 case IPPROTO_ROUTING: 1266 if (!in6p->in6p_flags & IN6P_RTHDR) 1267 break; 1268 1269 *mp = sbcreatecontrol((void *)ip6e, elen, 1270 IS2292(IPV6_2292RTHDR, IPV6_RTHDR), 1271 IPPROTO_IPV6); 1272 if (*mp) 1273 mp = &(*mp)->m_next; 1274 break; 1275 1276 case IPPROTO_HOPOPTS: 1277 case IPPROTO_AH: /* is it possible? */ 1278 break; 1279 1280 default: 1281 /* 1282 * other cases have been filtered in the above. 1283 * none will visit this case. here we supply 1284 * the code just in case (nxt overwritten or 1285 * other cases). 1286 */ 1287 m_freem(ext); 1288 goto loopend; 1289 1290 } 1291 1292 /* proceed with the next header. */ 1293 off += elen; 1294 nxt = ip6e->ip6e_nxt; 1295 ip6e = NULL; 1296 m_freem(ext); 1297 ext = NULL; 1298 } 1299 loopend: 1300 ; 1301 } 1302 } 1303 #undef IS2292 1304 1305 1306 void 1307 ip6_notify_pmtu(struct in6pcb *in6p, const struct sockaddr_in6 *dst, 1308 uint32_t *mtu) 1309 { 1310 struct socket *so; 1311 struct mbuf *m_mtu; 1312 struct ip6_mtuinfo mtuctl; 1313 1314 so = in6p->in6p_socket; 1315 1316 if (mtu == NULL) 1317 return; 1318 1319 #ifdef DIAGNOSTIC 1320 if (so == NULL) /* I believe this is impossible */ 1321 panic("ip6_notify_pmtu: socket is NULL"); 1322 #endif 1323 1324 memset(&mtuctl, 0, sizeof(mtuctl)); /* zero-clear for safety */ 1325 mtuctl.ip6m_mtu = *mtu; 1326 mtuctl.ip6m_addr = *dst; 1327 if (sa6_recoverscope(&mtuctl.ip6m_addr)) 1328 return; 1329 1330 if ((m_mtu = sbcreatecontrol((void *)&mtuctl, sizeof(mtuctl), 1331 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL) 1332 return; 1333 1334 if (sbappendaddr(&so->so_rcv, (const struct sockaddr *)dst, NULL, m_mtu) 1335 == 0) { 1336 m_freem(m_mtu); 1337 /* XXX: should count statistics */ 1338 } else 1339 sorwakeup(so); 1340 1341 return; 1342 } 1343 1344 /* 1345 * pull single extension header from mbuf chain. returns single mbuf that 1346 * contains the result, or NULL on error. 1347 */ 1348 static struct mbuf * 1349 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt) 1350 { 1351 struct ip6_ext ip6e; 1352 size_t elen; 1353 struct mbuf *n; 1354 1355 #ifdef DIAGNOSTIC 1356 switch (nxt) { 1357 case IPPROTO_DSTOPTS: 1358 case IPPROTO_ROUTING: 1359 case IPPROTO_HOPOPTS: 1360 case IPPROTO_AH: /* is it possible? */ 1361 break; 1362 default: 1363 printf("ip6_pullexthdr: invalid nxt=%d\n", nxt); 1364 } 1365 #endif 1366 1367 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1368 if (nxt == IPPROTO_AH) 1369 elen = (ip6e.ip6e_len + 2) << 2; 1370 else 1371 elen = (ip6e.ip6e_len + 1) << 3; 1372 1373 MGET(n, M_DONTWAIT, MT_DATA); 1374 if (n && elen >= MLEN) { 1375 MCLGET(n, M_DONTWAIT); 1376 if ((n->m_flags & M_EXT) == 0) { 1377 m_free(n); 1378 n = NULL; 1379 } 1380 } 1381 if (!n) 1382 return NULL; 1383 1384 n->m_len = 0; 1385 if (elen >= M_TRAILINGSPACE(n)) { 1386 m_free(n); 1387 return NULL; 1388 } 1389 1390 m_copydata(m, off, elen, mtod(n, void *)); 1391 n->m_len = elen; 1392 return n; 1393 } 1394 1395 /* 1396 * Get pointer to the previous header followed by the header 1397 * currently processed. 1398 * XXX: This function supposes that 1399 * M includes all headers, 1400 * the next header field and the header length field of each header 1401 * are valid, and 1402 * the sum of each header length equals to OFF. 1403 * Because of these assumptions, this function must be called very 1404 * carefully. Moreover, it will not be used in the near future when 1405 * we develop `neater' mechanism to process extension headers. 1406 */ 1407 u_int8_t * 1408 ip6_get_prevhdr(struct mbuf *m, int off) 1409 { 1410 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1411 1412 if (off == sizeof(struct ip6_hdr)) 1413 return (&ip6->ip6_nxt); 1414 else { 1415 int len, nxt; 1416 struct ip6_ext *ip6e = NULL; 1417 1418 nxt = ip6->ip6_nxt; 1419 len = sizeof(struct ip6_hdr); 1420 while (len < off) { 1421 ip6e = (struct ip6_ext *)(mtod(m, char *) + len); 1422 1423 switch (nxt) { 1424 case IPPROTO_FRAGMENT: 1425 len += sizeof(struct ip6_frag); 1426 break; 1427 case IPPROTO_AH: 1428 len += (ip6e->ip6e_len + 2) << 2; 1429 break; 1430 default: 1431 len += (ip6e->ip6e_len + 1) << 3; 1432 break; 1433 } 1434 nxt = ip6e->ip6e_nxt; 1435 } 1436 if (ip6e) 1437 return (&ip6e->ip6e_nxt); 1438 else 1439 return NULL; 1440 } 1441 } 1442 1443 /* 1444 * get next header offset. m will be retained. 1445 */ 1446 int 1447 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp) 1448 { 1449 struct ip6_hdr ip6; 1450 struct ip6_ext ip6e; 1451 struct ip6_frag fh; 1452 1453 /* just in case */ 1454 if (m == NULL) 1455 panic("ip6_nexthdr: m == NULL"); 1456 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off) 1457 return -1; 1458 1459 switch (proto) { 1460 case IPPROTO_IPV6: 1461 /* do not chase beyond intermediate IPv6 headers */ 1462 if (off != 0) 1463 return -1; 1464 if (m->m_pkthdr.len < off + sizeof(ip6)) 1465 return -1; 1466 m_copydata(m, off, sizeof(ip6), (void *)&ip6); 1467 if (nxtp) 1468 *nxtp = ip6.ip6_nxt; 1469 off += sizeof(ip6); 1470 return off; 1471 1472 case IPPROTO_FRAGMENT: 1473 /* 1474 * terminate parsing if it is not the first fragment, 1475 * it does not make sense to parse through it. 1476 */ 1477 if (m->m_pkthdr.len < off + sizeof(fh)) 1478 return -1; 1479 m_copydata(m, off, sizeof(fh), (void *)&fh); 1480 if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0) 1481 return -1; 1482 if (nxtp) 1483 *nxtp = fh.ip6f_nxt; 1484 off += sizeof(struct ip6_frag); 1485 return off; 1486 1487 case IPPROTO_AH: 1488 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1489 return -1; 1490 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1491 if (nxtp) 1492 *nxtp = ip6e.ip6e_nxt; 1493 off += (ip6e.ip6e_len + 2) << 2; 1494 if (m->m_pkthdr.len < off) 1495 return -1; 1496 return off; 1497 1498 case IPPROTO_HOPOPTS: 1499 case IPPROTO_ROUTING: 1500 case IPPROTO_DSTOPTS: 1501 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1502 return -1; 1503 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1504 if (nxtp) 1505 *nxtp = ip6e.ip6e_nxt; 1506 off += (ip6e.ip6e_len + 1) << 3; 1507 if (m->m_pkthdr.len < off) 1508 return -1; 1509 return off; 1510 1511 case IPPROTO_NONE: 1512 case IPPROTO_ESP: 1513 case IPPROTO_IPCOMP: 1514 /* give up */ 1515 return -1; 1516 1517 default: 1518 return -1; 1519 } 1520 } 1521 1522 /* 1523 * get offset for the last header in the chain. m will be kept untainted. 1524 */ 1525 int 1526 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp) 1527 { 1528 int newoff; 1529 int nxt; 1530 1531 if (!nxtp) { 1532 nxt = -1; 1533 nxtp = &nxt; 1534 } 1535 for (;;) { 1536 newoff = ip6_nexthdr(m, off, proto, nxtp); 1537 if (newoff < 0) 1538 return off; 1539 else if (newoff < off) 1540 return -1; /* invalid */ 1541 else if (newoff == off) 1542 return newoff; 1543 1544 off = newoff; 1545 proto = *nxtp; 1546 } 1547 } 1548 1549 struct m_tag * 1550 ip6_addaux(struct mbuf *m) 1551 { 1552 struct m_tag *mtag; 1553 1554 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1555 if (!mtag) { 1556 mtag = m_tag_get(PACKET_TAG_INET6, sizeof(struct ip6aux), 1557 M_NOWAIT); 1558 if (mtag) { 1559 m_tag_prepend(m, mtag); 1560 bzero(mtag + 1, sizeof(struct ip6aux)); 1561 } 1562 } 1563 return mtag; 1564 } 1565 1566 struct m_tag * 1567 ip6_findaux(struct mbuf *m) 1568 { 1569 struct m_tag *mtag; 1570 1571 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1572 return mtag; 1573 } 1574 1575 void 1576 ip6_delaux(struct mbuf *m) 1577 { 1578 struct m_tag *mtag; 1579 1580 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1581 if (mtag) 1582 m_tag_delete(m, mtag); 1583 } 1584 1585 #ifdef GATEWAY 1586 /* 1587 * sysctl helper routine for net.inet.ip6.maxflows. Since 1588 * we could reduce this value, call ip6flow_reap(); 1589 */ 1590 static int 1591 sysctl_net_inet6_ip6_maxflows(SYSCTLFN_ARGS) 1592 { 1593 int s; 1594 1595 s = sysctl_lookup(SYSCTLFN_CALL(rnode)); 1596 if (s || newp == NULL) 1597 return (s); 1598 1599 s = splsoftnet(); 1600 ip6flow_reap(0); 1601 splx(s); 1602 1603 return (0); 1604 } 1605 1606 static int 1607 sysctl_net_inet6_ip6_hashsize(SYSCTLFN_ARGS) 1608 { 1609 int error, tmp; 1610 struct sysctlnode node; 1611 1612 node = *rnode; 1613 tmp = ip6_hashsize; 1614 node.sysctl_data = &tmp; 1615 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 1616 if (error || newp == NULL) 1617 return (error); 1618 1619 if ((tmp & (tmp - 1)) == 0 && tmp != 0) { 1620 /* 1621 * Can only fail due to malloc() 1622 */ 1623 if (ip6flow_invalidate_all(tmp)) 1624 return ENOMEM; 1625 } else { 1626 /* 1627 * EINVAL if not a power of 2 1628 */ 1629 return EINVAL; 1630 } 1631 1632 return (0); 1633 } 1634 #endif /* GATEWAY */ 1635 1636 /* 1637 * System control for IP6 1638 */ 1639 1640 u_char inet6ctlerrmap[PRC_NCMDS] = { 1641 0, 0, 0, 0, 1642 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 1643 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 1644 EMSGSIZE, EHOSTUNREACH, 0, 0, 1645 0, 0, 0, 0, 1646 ENOPROTOOPT 1647 }; 1648 1649 static void 1650 ip6stat_convert_to_user_cb(void *v1, void *v2, struct cpu_info *ci) 1651 { 1652 uint64_t *ip6sc = v1; 1653 uint64_t *ip6s = v2; 1654 u_int i; 1655 1656 for (i = 0; i < IP6_NSTATS; i++) 1657 ip6s[i] += ip6sc[i]; 1658 } 1659 1660 static void 1661 ip6stat_convert_to_user(uint64_t *ip6s) 1662 { 1663 1664 memset(ip6s, 0, sizeof(uint64_t) * IP6_NSTATS); 1665 percpu_foreach(ip6stat_percpu, ip6stat_convert_to_user_cb, ip6s); 1666 } 1667 1668 static int 1669 sysctl_net_inet6_ip6_stats(SYSCTLFN_ARGS) 1670 { 1671 struct sysctlnode node; 1672 uint64_t ip6s[IP6_NSTATS]; 1673 1674 ip6stat_convert_to_user(ip6s); 1675 node = *rnode; 1676 node.sysctl_data = ip6s; 1677 node.sysctl_size = sizeof(ip6s); 1678 return (sysctl_lookup(SYSCTLFN_CALL(&node))); 1679 } 1680 1681 SYSCTL_SETUP(sysctl_net_inet6_ip6_setup, "sysctl net.inet6.ip6 subtree setup") 1682 { 1683 #ifdef RFC2292 1684 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y)) 1685 #else 1686 #define IS2292(x, y) (y) 1687 #endif 1688 1689 sysctl_createv(clog, 0, NULL, NULL, 1690 CTLFLAG_PERMANENT, 1691 CTLTYPE_NODE, "net", NULL, 1692 NULL, 0, NULL, 0, 1693 CTL_NET, CTL_EOL); 1694 sysctl_createv(clog, 0, NULL, NULL, 1695 CTLFLAG_PERMANENT, 1696 CTLTYPE_NODE, "inet6", 1697 SYSCTL_DESCR("PF_INET6 related settings"), 1698 NULL, 0, NULL, 0, 1699 CTL_NET, PF_INET6, CTL_EOL); 1700 sysctl_createv(clog, 0, NULL, NULL, 1701 CTLFLAG_PERMANENT, 1702 CTLTYPE_NODE, "ip6", 1703 SYSCTL_DESCR("IPv6 related settings"), 1704 NULL, 0, NULL, 0, 1705 CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_EOL); 1706 1707 sysctl_createv(clog, 0, NULL, NULL, 1708 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1709 CTLTYPE_INT, "forwarding", 1710 SYSCTL_DESCR("Enable forwarding of INET6 datagrams"), 1711 NULL, 0, &ip6_forwarding, 0, 1712 CTL_NET, PF_INET6, IPPROTO_IPV6, 1713 IPV6CTL_FORWARDING, CTL_EOL); 1714 sysctl_createv(clog, 0, NULL, NULL, 1715 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1716 CTLTYPE_INT, "redirect", 1717 SYSCTL_DESCR("Enable sending of ICMPv6 redirect messages"), 1718 NULL, 0, &ip6_sendredirects, 0, 1719 CTL_NET, PF_INET6, IPPROTO_IPV6, 1720 IPV6CTL_SENDREDIRECTS, CTL_EOL); 1721 sysctl_createv(clog, 0, NULL, NULL, 1722 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1723 CTLTYPE_INT, "hlim", 1724 SYSCTL_DESCR("Hop limit for an INET6 datagram"), 1725 NULL, 0, &ip6_defhlim, 0, 1726 CTL_NET, PF_INET6, IPPROTO_IPV6, 1727 IPV6CTL_DEFHLIM, CTL_EOL); 1728 #ifdef notyet 1729 sysctl_createv(clog, 0, NULL, NULL, 1730 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1731 CTLTYPE_INT, "mtu", NULL, 1732 NULL, 0, &, 0, 1733 CTL_NET, PF_INET6, IPPROTO_IPV6, 1734 IPV6CTL_DEFMTU, CTL_EOL); 1735 #endif 1736 #ifdef __no_idea__ 1737 sysctl_createv(clog, 0, NULL, NULL, 1738 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1739 CTLTYPE_INT, "forwsrcrt", NULL, 1740 NULL, 0, &?, 0, 1741 CTL_NET, PF_INET6, IPPROTO_IPV6, 1742 IPV6CTL_FORWSRCRT, CTL_EOL); 1743 sysctl_createv(clog, 0, NULL, NULL, 1744 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1745 CTLTYPE_STRUCT, "mrtstats", NULL, 1746 NULL, 0, &?, sizeof(?), 1747 CTL_NET, PF_INET6, IPPROTO_IPV6, 1748 IPV6CTL_MRTSTATS, CTL_EOL); 1749 sysctl_createv(clog, 0, NULL, NULL, 1750 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1751 CTLTYPE_?, "mrtproto", NULL, 1752 NULL, 0, &?, sizeof(?), 1753 CTL_NET, PF_INET6, IPPROTO_IPV6, 1754 IPV6CTL_MRTPROTO, CTL_EOL); 1755 #endif 1756 sysctl_createv(clog, 0, NULL, NULL, 1757 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1758 CTLTYPE_INT, "maxfragpackets", 1759 SYSCTL_DESCR("Maximum number of fragments to buffer " 1760 "for reassembly"), 1761 NULL, 0, &ip6_maxfragpackets, 0, 1762 CTL_NET, PF_INET6, IPPROTO_IPV6, 1763 IPV6CTL_MAXFRAGPACKETS, CTL_EOL); 1764 #ifdef __no_idea__ 1765 sysctl_createv(clog, 0, NULL, NULL, 1766 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1767 CTLTYPE_INT, "sourcecheck", NULL, 1768 NULL, 0, &?, 0, 1769 CTL_NET, PF_INET6, IPPROTO_IPV6, 1770 IPV6CTL_SOURCECHECK, CTL_EOL); 1771 sysctl_createv(clog, 0, NULL, NULL, 1772 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1773 CTLTYPE_INT, "sourcecheck_logint", NULL, 1774 NULL, 0, &?, 0, 1775 CTL_NET, PF_INET6, IPPROTO_IPV6, 1776 IPV6CTL_SOURCECHECK_LOGINT, CTL_EOL); 1777 #endif 1778 sysctl_createv(clog, 0, NULL, NULL, 1779 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1780 CTLTYPE_INT, "accept_rtadv", 1781 SYSCTL_DESCR("Accept router advertisements"), 1782 NULL, 0, &ip6_accept_rtadv, 0, 1783 CTL_NET, PF_INET6, IPPROTO_IPV6, 1784 IPV6CTL_ACCEPT_RTADV, CTL_EOL); 1785 sysctl_createv(clog, 0, NULL, NULL, 1786 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1787 CTLTYPE_INT, "keepfaith", 1788 SYSCTL_DESCR("Activate faith interface"), 1789 NULL, 0, &ip6_keepfaith, 0, 1790 CTL_NET, PF_INET6, IPPROTO_IPV6, 1791 IPV6CTL_KEEPFAITH, CTL_EOL); 1792 sysctl_createv(clog, 0, NULL, NULL, 1793 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1794 CTLTYPE_INT, "log_interval", 1795 SYSCTL_DESCR("Minumum interval between logging " 1796 "unroutable packets"), 1797 NULL, 0, &ip6_log_interval, 0, 1798 CTL_NET, PF_INET6, IPPROTO_IPV6, 1799 IPV6CTL_LOG_INTERVAL, CTL_EOL); 1800 sysctl_createv(clog, 0, NULL, NULL, 1801 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1802 CTLTYPE_INT, "hdrnestlimit", 1803 SYSCTL_DESCR("Maximum number of nested IPv6 headers"), 1804 NULL, 0, &ip6_hdrnestlimit, 0, 1805 CTL_NET, PF_INET6, IPPROTO_IPV6, 1806 IPV6CTL_HDRNESTLIMIT, CTL_EOL); 1807 sysctl_createv(clog, 0, NULL, NULL, 1808 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1809 CTLTYPE_INT, "dad_count", 1810 SYSCTL_DESCR("Number of Duplicate Address Detection " 1811 "probes to send"), 1812 NULL, 0, &ip6_dad_count, 0, 1813 CTL_NET, PF_INET6, IPPROTO_IPV6, 1814 IPV6CTL_DAD_COUNT, CTL_EOL); 1815 sysctl_createv(clog, 0, NULL, NULL, 1816 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1817 CTLTYPE_INT, "auto_flowlabel", 1818 SYSCTL_DESCR("Assign random IPv6 flow labels"), 1819 NULL, 0, &ip6_auto_flowlabel, 0, 1820 CTL_NET, PF_INET6, IPPROTO_IPV6, 1821 IPV6CTL_AUTO_FLOWLABEL, CTL_EOL); 1822 sysctl_createv(clog, 0, NULL, NULL, 1823 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1824 CTLTYPE_INT, "defmcasthlim", 1825 SYSCTL_DESCR("Default multicast hop limit"), 1826 NULL, 0, &ip6_defmcasthlim, 0, 1827 CTL_NET, PF_INET6, IPPROTO_IPV6, 1828 IPV6CTL_DEFMCASTHLIM, CTL_EOL); 1829 #if NGIF > 0 1830 sysctl_createv(clog, 0, NULL, NULL, 1831 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1832 CTLTYPE_INT, "gifhlim", 1833 SYSCTL_DESCR("Default hop limit for a gif tunnel datagram"), 1834 NULL, 0, &ip6_gif_hlim, 0, 1835 CTL_NET, PF_INET6, IPPROTO_IPV6, 1836 IPV6CTL_GIF_HLIM, CTL_EOL); 1837 #endif /* NGIF */ 1838 sysctl_createv(clog, 0, NULL, NULL, 1839 CTLFLAG_PERMANENT, 1840 CTLTYPE_STRING, "kame_version", 1841 SYSCTL_DESCR("KAME Version"), 1842 NULL, 0, __UNCONST(__KAME_VERSION), 0, 1843 CTL_NET, PF_INET6, IPPROTO_IPV6, 1844 IPV6CTL_KAME_VERSION, CTL_EOL); 1845 sysctl_createv(clog, 0, NULL, NULL, 1846 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1847 CTLTYPE_INT, "use_deprecated", 1848 SYSCTL_DESCR("Allow use of deprecated addresses as " 1849 "source addresses"), 1850 NULL, 0, &ip6_use_deprecated, 0, 1851 CTL_NET, PF_INET6, IPPROTO_IPV6, 1852 IPV6CTL_USE_DEPRECATED, CTL_EOL); 1853 sysctl_createv(clog, 0, NULL, NULL, 1854 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1855 CTLTYPE_INT, "rr_prune", NULL, 1856 NULL, 0, &ip6_rr_prune, 0, 1857 CTL_NET, PF_INET6, IPPROTO_IPV6, 1858 IPV6CTL_RR_PRUNE, CTL_EOL); 1859 sysctl_createv(clog, 0, NULL, NULL, 1860 CTLFLAG_PERMANENT 1861 #ifndef INET6_BINDV6ONLY 1862 |CTLFLAG_READWRITE, 1863 #endif 1864 CTLTYPE_INT, "v6only", 1865 SYSCTL_DESCR("Disallow PF_INET6 sockets from connecting " 1866 "to PF_INET sockets"), 1867 NULL, 0, &ip6_v6only, 0, 1868 CTL_NET, PF_INET6, IPPROTO_IPV6, 1869 IPV6CTL_V6ONLY, CTL_EOL); 1870 sysctl_createv(clog, 0, NULL, NULL, 1871 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1872 CTLTYPE_INT, "anonportmin", 1873 SYSCTL_DESCR("Lowest ephemeral port number to assign"), 1874 sysctl_net_inet_ip_ports, 0, &ip6_anonportmin, 0, 1875 CTL_NET, PF_INET6, IPPROTO_IPV6, 1876 IPV6CTL_ANONPORTMIN, CTL_EOL); 1877 sysctl_createv(clog, 0, NULL, NULL, 1878 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1879 CTLTYPE_INT, "anonportmax", 1880 SYSCTL_DESCR("Highest ephemeral port number to assign"), 1881 sysctl_net_inet_ip_ports, 0, &ip6_anonportmax, 0, 1882 CTL_NET, PF_INET6, IPPROTO_IPV6, 1883 IPV6CTL_ANONPORTMAX, CTL_EOL); 1884 #ifndef IPNOPRIVPORTS 1885 sysctl_createv(clog, 0, NULL, NULL, 1886 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1887 CTLTYPE_INT, "lowportmin", 1888 SYSCTL_DESCR("Lowest privileged ephemeral port number " 1889 "to assign"), 1890 sysctl_net_inet_ip_ports, 0, &ip6_lowportmin, 0, 1891 CTL_NET, PF_INET6, IPPROTO_IPV6, 1892 IPV6CTL_LOWPORTMIN, CTL_EOL); 1893 sysctl_createv(clog, 0, NULL, NULL, 1894 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1895 CTLTYPE_INT, "lowportmax", 1896 SYSCTL_DESCR("Highest privileged ephemeral port number " 1897 "to assign"), 1898 sysctl_net_inet_ip_ports, 0, &ip6_lowportmax, 0, 1899 CTL_NET, PF_INET6, IPPROTO_IPV6, 1900 IPV6CTL_LOWPORTMAX, CTL_EOL); 1901 #endif /* IPNOPRIVPORTS */ 1902 sysctl_createv(clog, 0, NULL, NULL, 1903 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1904 CTLTYPE_INT, "use_tempaddr", 1905 SYSCTL_DESCR("Use temporary address"), 1906 NULL, 0, &ip6_use_tempaddr, 0, 1907 CTL_NET, PF_INET6, IPPROTO_IPV6, 1908 CTL_CREATE, CTL_EOL); 1909 sysctl_createv(clog, 0, NULL, NULL, 1910 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1911 CTLTYPE_INT, "temppltime", 1912 SYSCTL_DESCR("preferred lifetime of a temporary address"), 1913 NULL, 0, &ip6_temp_preferred_lifetime, 0, 1914 CTL_NET, PF_INET6, IPPROTO_IPV6, 1915 CTL_CREATE, CTL_EOL); 1916 sysctl_createv(clog, 0, NULL, NULL, 1917 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1918 CTLTYPE_INT, "tempvltime", 1919 SYSCTL_DESCR("valid lifetime of a temporary address"), 1920 NULL, 0, &ip6_temp_valid_lifetime, 0, 1921 CTL_NET, PF_INET6, IPPROTO_IPV6, 1922 CTL_CREATE, CTL_EOL); 1923 sysctl_createv(clog, 0, NULL, NULL, 1924 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1925 CTLTYPE_INT, "maxfrags", 1926 SYSCTL_DESCR("Maximum fragments in reassembly queue"), 1927 NULL, 0, &ip6_maxfrags, 0, 1928 CTL_NET, PF_INET6, IPPROTO_IPV6, 1929 IPV6CTL_MAXFRAGS, CTL_EOL); 1930 sysctl_createv(clog, 0, NULL, NULL, 1931 CTLFLAG_PERMANENT, 1932 CTLTYPE_STRUCT, "stats", 1933 SYSCTL_DESCR("IPv6 statistics"), 1934 sysctl_net_inet6_ip6_stats, 0, NULL, 0, 1935 CTL_NET, PF_INET6, IPPROTO_IPV6, 1936 IPV6CTL_STATS, CTL_EOL); 1937 sysctl_createv(clog, 0, NULL, NULL, 1938 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1939 CTLTYPE_INT, "use_defaultzone", 1940 SYSCTL_DESCR("Whether to use the default scope zones"), 1941 NULL, 0, &ip6_use_defzone, 0, 1942 CTL_NET, PF_INET6, IPPROTO_IPV6, 1943 IPV6CTL_USE_DEFAULTZONE, CTL_EOL); 1944 sysctl_createv(clog, 0, NULL, NULL, 1945 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1946 CTLTYPE_INT, "mcast_pmtu", 1947 SYSCTL_DESCR("Enable pMTU discovery for multicast packet"), 1948 NULL, 0, &ip6_mcast_pmtu, 0, 1949 CTL_NET, PF_INET6, IPPROTO_IPV6, 1950 CTL_CREATE, CTL_EOL); 1951 #ifdef GATEWAY 1952 sysctl_createv(clog, 0, NULL, NULL, 1953 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1954 CTLTYPE_INT, "maxflows", 1955 SYSCTL_DESCR("Number of flows for fast forwarding (IPv6)"), 1956 sysctl_net_inet6_ip6_maxflows, 0, &ip6_maxflows, 0, 1957 CTL_NET, PF_INET6, IPPROTO_IPV6, 1958 CTL_CREATE, CTL_EOL); 1959 sysctl_createv(clog, 0, NULL, NULL, 1960 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1961 CTLTYPE_INT, "hashsize", 1962 SYSCTL_DESCR("Size of hash table for fast forwarding (IPv6)"), 1963 sysctl_net_inet6_ip6_hashsize, 0, &ip6_hashsize, 0, 1964 CTL_NET, PF_INET6, IPPROTO_IPV6, 1965 CTL_CREATE, CTL_EOL); 1966 #endif 1967 } 1968 1969 void 1970 ip6_statinc(u_int stat) 1971 { 1972 1973 KASSERT(stat < IP6_NSTATS); 1974 IP6_STATINC(stat); 1975 } 1976