ip6_input.c revision 1.148
1 /* $NetBSD: ip6_input.c,v 1.148 2014/06/05 23:48:16 rmind 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 1.148 2014/06/05 23:48:16 rmind 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_compat_netbsd.h" 72 73 #include <sys/param.h> 74 #include <sys/systm.h> 75 #include <sys/malloc.h> 76 #include <sys/mbuf.h> 77 #include <sys/domain.h> 78 #include <sys/protosw.h> 79 #include <sys/socket.h> 80 #include <sys/socketvar.h> 81 #include <sys/errno.h> 82 #include <sys/time.h> 83 #include <sys/kernel.h> 84 #include <sys/syslog.h> 85 #include <sys/proc.h> 86 #include <sys/sysctl.h> 87 #include <sys/cprng.h> 88 89 #include <net/if.h> 90 #include <net/if_types.h> 91 #include <net/if_dl.h> 92 #include <net/route.h> 93 #include <net/pktqueue.h> 94 #include <net/pfil.h> 95 96 #include <netinet/in.h> 97 #include <netinet/in_systm.h> 98 #ifdef INET 99 #include <netinet/ip.h> 100 #include <netinet/ip_var.h> 101 #include <netinet/ip_icmp.h> 102 #endif /* INET */ 103 #include <netinet/ip6.h> 104 #include <netinet/portalgo.h> 105 #include <netinet6/in6_var.h> 106 #include <netinet6/ip6_var.h> 107 #include <netinet6/ip6_private.h> 108 #include <netinet6/in6_pcb.h> 109 #include <netinet/icmp6.h> 110 #include <netinet6/scope6_var.h> 111 #include <netinet6/in6_ifattach.h> 112 #include <netinet6/nd6.h> 113 114 #ifdef IPSEC 115 #include <netipsec/ipsec.h> 116 #include <netipsec/ipsec6.h> 117 #include <netipsec/key.h> 118 #endif /* IPSEC */ 119 120 #ifdef COMPAT_50 121 #include <compat/sys/time.h> 122 #include <compat/sys/socket.h> 123 #endif 124 125 #include <netinet6/ip6protosw.h> 126 127 #include "faith.h" 128 #include "gif.h" 129 130 #if NGIF > 0 131 #include <netinet6/in6_gif.h> 132 #endif 133 134 #include <net/net_osdep.h> 135 136 extern struct domain inet6domain; 137 138 u_char ip6_protox[IPPROTO_MAX]; 139 struct in6_ifaddr *in6_ifaddr; 140 pktqueue_t *ip6_pktq __read_mostly; 141 142 extern callout_t in6_tmpaddrtimer_ch; 143 144 int ip6_forward_srcrt; /* XXX */ 145 int ip6_sourcecheck; /* XXX */ 146 int ip6_sourcecheck_interval; /* XXX */ 147 148 pfil_head_t *inet6_pfil_hook; 149 150 percpu_t *ip6stat_percpu; 151 152 static void ip6_init2(void *); 153 static void ip6intr(void *); 154 static struct m_tag *ip6_setdstifaddr(struct mbuf *, const struct in6_ifaddr *); 155 156 static int ip6_process_hopopts(struct mbuf *, u_int8_t *, int, u_int32_t *, 157 u_int32_t *); 158 static struct mbuf *ip6_pullexthdr(struct mbuf *, size_t, int); 159 static void sysctl_net_inet6_ip6_setup(struct sysctllog **); 160 161 /* 162 * IP6 initialization: fill in IP6 protocol switch table. 163 * All protocols not implemented in kernel go to raw IP6 protocol handler. 164 */ 165 void 166 ip6_init(void) 167 { 168 const struct ip6protosw *pr; 169 int i; 170 171 sysctl_net_inet6_ip6_setup(NULL); 172 pr = (const struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 173 if (pr == 0) 174 panic("ip6_init"); 175 for (i = 0; i < IPPROTO_MAX; i++) 176 ip6_protox[i] = pr - inet6sw; 177 for (pr = (const struct ip6protosw *)inet6domain.dom_protosw; 178 pr < (const struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++) 179 if (pr->pr_domain->dom_family == PF_INET6 && 180 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) 181 ip6_protox[pr->pr_protocol] = pr - inet6sw; 182 183 ip6_pktq = pktq_create(IFQ_MAXLEN, ip6intr); 184 KASSERT(ip6_pktq != NULL); 185 186 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 /* Register our Packet Filter hook. */ 197 inet6_pfil_hook = pfil_head_create(PFIL_TYPE_AF, (void *)AF_INET6); 198 KASSERT(inet6_pfil_hook != NULL); 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, CALLOUT_MPSAFE); 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, CALLOUT_MPSAFE); 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 static void 223 ip6intr(void *arg __unused) 224 { 225 struct mbuf *m; 226 227 mutex_enter(softnet_lock); 228 while ((m = pktq_dequeue(ip6_pktq)) != NULL) { 229 const ifnet_t *ifp = m->m_pkthdr.rcvif; 230 231 /* 232 * Drop the packet if IPv6 is disabled on the interface. 233 */ 234 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)) { 235 m_freem(m); 236 continue; 237 } 238 ip6_input(m); 239 } 240 mutex_exit(softnet_lock); 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; 260 261 /* 262 * make sure we don't have onion peering information into m_tag. 263 */ 264 ip6_delaux(m); 265 266 /* 267 * mbuf statistics 268 */ 269 if (m->m_flags & M_EXT) { 270 if (m->m_next) 271 IP6_STATINC(IP6_STAT_MEXT2M); 272 else 273 IP6_STATINC(IP6_STAT_MEXT1); 274 } else { 275 #define M2MMAX 32 276 if (m->m_next) { 277 if (m->m_flags & M_LOOP) { 278 /*XXX*/ IP6_STATINC(IP6_STAT_M2M + lo0ifp->if_index); 279 } else if (m->m_pkthdr.rcvif->if_index < M2MMAX) { 280 IP6_STATINC(IP6_STAT_M2M + 281 m->m_pkthdr.rcvif->if_index); 282 } else 283 IP6_STATINC(IP6_STAT_M2M); 284 } else 285 IP6_STATINC(IP6_STAT_M1); 286 #undef M2MMAX 287 } 288 289 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive); 290 IP6_STATINC(IP6_STAT_TOTAL); 291 292 /* 293 * If the IPv6 header is not aligned, slurp it up into a new 294 * mbuf with space for link headers, in the event we forward 295 * it. Otherwise, if it is aligned, make sure the entire base 296 * IPv6 header is in the first mbuf of the chain. 297 */ 298 if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 299 struct ifnet *inifp = m->m_pkthdr.rcvif; 300 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 301 (max_linkhdr + 3) & ~3)) == NULL) { 302 /* XXXJRT new stat, please */ 303 IP6_STATINC(IP6_STAT_TOOSMALL); 304 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 305 return; 306 } 307 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 308 struct ifnet *inifp = m->m_pkthdr.rcvif; 309 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 310 IP6_STATINC(IP6_STAT_TOOSMALL); 311 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 312 return; 313 } 314 } 315 316 ip6 = mtod(m, struct ip6_hdr *); 317 318 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 319 IP6_STATINC(IP6_STAT_BADVERS); 320 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 321 goto bad; 322 } 323 324 /* 325 * Assume that we can create a fast-forward IP flow entry 326 * based on this packet. 327 */ 328 m->m_flags |= M_CANFASTFWD; 329 330 /* 331 * Run through list of hooks for input packets. If there are any 332 * filters which require that additional packets in the flow are 333 * not fast-forwarded, they must clear the M_CANFASTFWD flag. 334 * Note that filters must _never_ set this flag, as another filter 335 * in the list may have previously cleared it. 336 */ 337 /* 338 * let ipfilter look at packet on the wire, 339 * not the decapsulated packet. 340 */ 341 #if defined(IPSEC) 342 if (!ipsec_used || !ipsec_indone(m)) 343 #else 344 if (1) 345 #endif 346 { 347 struct in6_addr odst; 348 349 odst = ip6->ip6_dst; 350 if (pfil_run_hooks(inet6_pfil_hook, &m, m->m_pkthdr.rcvif, 351 PFIL_IN) != 0) 352 return; 353 if (m == NULL) 354 return; 355 ip6 = mtod(m, struct ip6_hdr *); 356 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst); 357 } 358 359 IP6_STATINC(IP6_STAT_NXTHIST + ip6->ip6_nxt); 360 361 #ifdef ALTQ 362 if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) { 363 /* packet is dropped by traffic conditioner */ 364 return; 365 } 366 #endif 367 368 /* 369 * Check against address spoofing/corruption. 370 */ 371 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) || 372 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) { 373 /* 374 * XXX: "badscope" is not very suitable for a multicast source. 375 */ 376 IP6_STATINC(IP6_STAT_BADSCOPE); 377 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 378 goto bad; 379 } 380 /* 381 * The following check is not documented in specs. A malicious 382 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack 383 * and bypass security checks (act as if it was from 127.0.0.1 by using 384 * IPv6 src ::ffff:127.0.0.1). Be cautious. 385 * 386 * This check chokes if we are in an SIIT cloud. As none of BSDs 387 * support IPv4-less kernel compilation, we cannot support SIIT 388 * environment at all. So, it makes more sense for us to reject any 389 * malicious packets for non-SIIT environment, than try to do a 390 * partial support for SIIT environment. 391 */ 392 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 393 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 394 IP6_STATINC(IP6_STAT_BADSCOPE); 395 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 396 goto bad; 397 } 398 #if 0 399 /* 400 * Reject packets with IPv4 compatible addresses (auto tunnel). 401 * 402 * The code forbids auto tunnel relay case in RFC1933 (the check is 403 * stronger than RFC1933). We may want to re-enable it if mech-xx 404 * is revised to forbid relaying case. 405 */ 406 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) || 407 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) { 408 IP6_STATINC(IP6_STAT_BADSCOPE); 409 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 410 goto bad; 411 } 412 #endif 413 414 /* 415 * Disambiguate address scope zones (if there is ambiguity). 416 * We first make sure that the original source or destination address 417 * is not in our internal form for scoped addresses. Such addresses 418 * are not necessarily invalid spec-wise, but we cannot accept them due 419 * to the usage conflict. 420 * in6_setscope() then also checks and rejects the cases where src or 421 * dst are the loopback address and the receiving interface 422 * is not loopback. 423 */ 424 if (__predict_false( 425 m_makewritable(&m, 0, sizeof(struct ip6_hdr), M_DONTWAIT))) 426 goto bad; 427 ip6 = mtod(m, struct ip6_hdr *); 428 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) { 429 IP6_STATINC(IP6_STAT_BADSCOPE); /* XXX */ 430 goto bad; 431 } 432 if (in6_setscope(&ip6->ip6_src, m->m_pkthdr.rcvif, NULL) || 433 in6_setscope(&ip6->ip6_dst, m->m_pkthdr.rcvif, NULL)) { 434 IP6_STATINC(IP6_STAT_BADSCOPE); 435 goto bad; 436 } 437 438 /* 439 * Multicast check 440 */ 441 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 442 struct in6_multi *in6m = 0; 443 444 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast); 445 /* 446 * See if we belong to the destination multicast group on the 447 * arrival interface. 448 */ 449 IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m); 450 if (in6m) 451 ours = 1; 452 else if (!ip6_mrouter) { 453 uint64_t *ip6s = IP6_STAT_GETREF(); 454 ip6s[IP6_STAT_NOTMEMBER]++; 455 ip6s[IP6_STAT_CANTFORWARD]++; 456 IP6_STAT_PUTREF(); 457 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 458 goto bad; 459 } 460 deliverifp = m->m_pkthdr.rcvif; 461 goto hbhcheck; 462 } 463 464 sockaddr_in6_init(&u.dst6, &ip6->ip6_dst, 0, 0, 0); 465 466 /* 467 * Unicast check 468 */ 469 rt = rtcache_lookup2(&ip6_forward_rt, &u.dst, 1, &hit); 470 if (hit) 471 IP6_STATINC(IP6_STAT_FORWARD_CACHEHIT); 472 else 473 IP6_STATINC(IP6_STAT_FORWARD_CACHEMISS); 474 475 #define rt6_getkey(__rt) satocsin6(rt_getkey(__rt)) 476 477 /* 478 * Accept the packet if the forwarding interface to the destination 479 * according to the routing table is the loopback interface, 480 * unless the associated route has a gateway. 481 * Note that this approach causes to accept a packet if there is a 482 * route to the loopback interface for the destination of the packet. 483 * But we think it's even useful in some situations, e.g. when using 484 * a special daemon which wants to intercept the packet. 485 */ 486 if (rt != NULL && 487 (rt->rt_flags & (RTF_HOST|RTF_GATEWAY)) == RTF_HOST && 488 !(rt->rt_flags & RTF_CLONED) && 489 #if 0 490 /* 491 * The check below is redundant since the comparison of 492 * the destination and the key of the rtentry has 493 * already done through looking up the routing table. 494 */ 495 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &rt6_getkey(rt)->sin6_addr) && 496 #endif 497 rt->rt_ifp->if_type == IFT_LOOP) { 498 struct in6_ifaddr *ia6 = (struct in6_ifaddr *)rt->rt_ifa; 499 if (ia6->ia6_flags & IN6_IFF_ANYCAST) 500 m->m_flags |= M_ANYCAST6; 501 /* 502 * packets to a tentative, duplicated, or somehow invalid 503 * address must not be accepted. 504 */ 505 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) { 506 /* this address is ready */ 507 ours = 1; 508 deliverifp = ia6->ia_ifp; /* correct? */ 509 goto hbhcheck; 510 } else { 511 /* address is not ready, so discard the packet. */ 512 nd6log((LOG_INFO, 513 "ip6_input: packet to an unready address %s->%s\n", 514 ip6_sprintf(&ip6->ip6_src), 515 ip6_sprintf(&ip6->ip6_dst))); 516 517 goto bad; 518 } 519 } 520 521 /* 522 * FAITH (Firewall Aided Internet Translator) 523 */ 524 #if defined(NFAITH) && 0 < NFAITH 525 if (ip6_keepfaith) { 526 if (rt != NULL && rt->rt_ifp != NULL && 527 rt->rt_ifp->if_type == IFT_FAITH) { 528 /* XXX do we need more sanity checks? */ 529 ours = 1; 530 deliverifp = rt->rt_ifp; /* faith */ 531 goto hbhcheck; 532 } 533 } 534 #endif 535 536 #if 0 537 { 538 /* 539 * Last resort: check in6_ifaddr for incoming interface. 540 * The code is here until I update the "goto ours hack" code above 541 * working right. 542 */ 543 struct ifaddr *ifa; 544 IFADDR_FOREACH(ifa, m->m_pkthdr.rcvif) { 545 if (ifa->ifa_addr == NULL) 546 continue; /* just for safety */ 547 if (ifa->ifa_addr->sa_family != AF_INET6) 548 continue; 549 if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) { 550 ours = 1; 551 deliverifp = ifa->ifa_ifp; 552 goto hbhcheck; 553 } 554 } 555 } 556 #endif 557 558 /* 559 * Now there is no reason to process the packet if it's not our own 560 * and we're not a router. 561 */ 562 if (!ip6_forwarding) { 563 IP6_STATINC(IP6_STAT_CANTFORWARD); 564 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 565 goto bad; 566 } 567 568 hbhcheck: 569 /* 570 * record address information into m_tag, if we don't have one yet. 571 * note that we are unable to record it, if the address is not listed 572 * as our interface address (e.g. multicast addresses, addresses 573 * within FAITH prefixes and such). 574 */ 575 if (deliverifp && ip6_getdstifaddr(m) == NULL) { 576 struct in6_ifaddr *ia6; 577 578 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 579 if (ia6 != NULL && ip6_setdstifaddr(m, ia6) == NULL) { 580 /* 581 * XXX maybe we should drop the packet here, 582 * as we could not provide enough information 583 * to the upper layers. 584 */ 585 } 586 } 587 588 /* 589 * Process Hop-by-Hop options header if it's contained. 590 * m may be modified in ip6_hopopts_input(). 591 * If a JumboPayload option is included, plen will also be modified. 592 */ 593 plen = (u_int32_t)ntohs(ip6->ip6_plen); 594 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 595 struct ip6_hbh *hbh; 596 597 if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) { 598 #if 0 /*touches NULL pointer*/ 599 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 600 #endif 601 return; /* m have already been freed */ 602 } 603 604 /* adjust pointer */ 605 ip6 = mtod(m, struct ip6_hdr *); 606 607 /* 608 * if the payload length field is 0 and the next header field 609 * indicates Hop-by-Hop Options header, then a Jumbo Payload 610 * option MUST be included. 611 */ 612 if (ip6->ip6_plen == 0 && plen == 0) { 613 /* 614 * Note that if a valid jumbo payload option is 615 * contained, ip6_hopopts_input() must set a valid 616 * (non-zero) payload length to the variable plen. 617 */ 618 IP6_STATINC(IP6_STAT_BADOPTIONS); 619 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 620 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 621 icmp6_error(m, ICMP6_PARAM_PROB, 622 ICMP6_PARAMPROB_HEADER, 623 (char *)&ip6->ip6_plen - (char *)ip6); 624 return; 625 } 626 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 627 sizeof(struct ip6_hbh)); 628 if (hbh == NULL) { 629 IP6_STATINC(IP6_STAT_TOOSHORT); 630 return; 631 } 632 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 633 nxt = hbh->ip6h_nxt; 634 635 /* 636 * accept the packet if a router alert option is included 637 * and we act as an IPv6 router. 638 */ 639 if (rtalert != ~0 && ip6_forwarding) 640 ours = 1; 641 } else 642 nxt = ip6->ip6_nxt; 643 644 /* 645 * Check that the amount of data in the buffers 646 * is as at least much as the IPv6 header would have us expect. 647 * Trim mbufs if longer than we expect. 648 * Drop packet if shorter than we expect. 649 */ 650 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 651 IP6_STATINC(IP6_STAT_TOOSHORT); 652 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 653 goto bad; 654 } 655 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 656 if (m->m_len == m->m_pkthdr.len) { 657 m->m_len = sizeof(struct ip6_hdr) + plen; 658 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 659 } else 660 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 661 } 662 663 /* 664 * Forward if desirable. 665 */ 666 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 667 /* 668 * If we are acting as a multicast router, all 669 * incoming multicast packets are passed to the 670 * kernel-level multicast forwarding function. 671 * The packet is returned (relatively) intact; if 672 * ip6_mforward() returns a non-zero value, the packet 673 * must be discarded, else it may be accepted below. 674 */ 675 if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) { 676 IP6_STATINC(IP6_STAT_CANTFORWARD); 677 m_freem(m); 678 return; 679 } 680 if (!ours) { 681 m_freem(m); 682 return; 683 } 684 } else if (!ours) { 685 ip6_forward(m, srcrt); 686 return; 687 } 688 689 ip6 = mtod(m, struct ip6_hdr *); 690 691 /* 692 * Malicious party may be able to use IPv4 mapped addr to confuse 693 * tcp/udp stack and bypass security checks (act as if it was from 694 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious. 695 * 696 * For SIIT end node behavior, you may want to disable the check. 697 * However, you will become vulnerable to attacks using IPv4 mapped 698 * source. 699 */ 700 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 701 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 702 IP6_STATINC(IP6_STAT_BADSCOPE); 703 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 704 goto bad; 705 } 706 707 /* 708 * Tell launch routine the next header 709 */ 710 #ifdef IFA_STATS 711 if (deliverifp != NULL) { 712 struct in6_ifaddr *ia6; 713 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 714 if (ia6) 715 ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len; 716 } 717 #endif 718 IP6_STATINC(IP6_STAT_DELIVERED); 719 in6_ifstat_inc(deliverifp, ifs6_in_deliver); 720 nest = 0; 721 722 rh_present = 0; 723 while (nxt != IPPROTO_DONE) { 724 if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) { 725 IP6_STATINC(IP6_STAT_TOOMANYHDR); 726 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 727 goto bad; 728 } 729 730 /* 731 * protection against faulty packet - there should be 732 * more sanity checks in header chain processing. 733 */ 734 if (m->m_pkthdr.len < off) { 735 IP6_STATINC(IP6_STAT_TOOSHORT); 736 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 737 goto bad; 738 } 739 740 if (nxt == IPPROTO_ROUTING) { 741 if (rh_present++) { 742 in6_ifstat_inc(m->m_pkthdr.rcvif, 743 ifs6_in_hdrerr); 744 IP6_STATINC(IP6_STAT_BADOPTIONS); 745 goto bad; 746 } 747 } 748 749 #ifdef IPSEC 750 if (ipsec_used) { 751 struct m_tag *mtag; 752 struct tdb_ident *tdbi; 753 struct secpolicy *sp; 754 int s, error; 755 756 /* 757 * enforce IPsec policy checking if we are seeing last 758 * header. note that we do not visit this with 759 * protocols with pcb layer code - like udp/tcp/raw ip. 760 */ 761 if ((inet6sw[ip_protox[nxt]].pr_flags 762 & PR_LASTHDR) != 0) { 763 /* 764 * Check if the packet has already had IPsec 765 * processing done. If so, then just pass it 766 * along. This tag gets set during AH, ESP, 767 * etc. input handling, before the packet is 768 * returned to the ip input queue for delivery. 769 */ 770 mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, 771 NULL); 772 s = splsoftnet(); 773 if (mtag != NULL) { 774 tdbi = (struct tdb_ident *)(mtag + 1); 775 sp = ipsec_getpolicy(tdbi, 776 IPSEC_DIR_INBOUND); 777 } else { 778 sp = ipsec_getpolicybyaddr(m, 779 IPSEC_DIR_INBOUND, IP_FORWARDING, 780 &error); 781 } 782 if (sp != NULL) { 783 /* 784 * Check security policy against packet 785 * attributes. 786 */ 787 error = ipsec_in_reject(sp, m); 788 KEY_FREESP(&sp); 789 } else { 790 /* XXX error stat??? */ 791 error = EINVAL; 792 DPRINTF(("ip6_input: no SP, packet" 793 " discarded\n"));/*XXX*/ 794 } 795 splx(s); 796 if (error) 797 goto bad; 798 } 799 } 800 #endif /* IPSEC */ 801 802 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt); 803 } 804 return; 805 bad: 806 m_freem(m); 807 } 808 809 /* 810 * set/grab in6_ifaddr correspond to IPv6 destination address. 811 */ 812 static struct m_tag * 813 ip6_setdstifaddr(struct mbuf *m, const struct in6_ifaddr *ia) 814 { 815 struct m_tag *mtag; 816 struct ip6aux *ip6a; 817 818 mtag = ip6_addaux(m); 819 if (mtag == NULL) 820 return NULL; 821 822 ip6a = (struct ip6aux *)(mtag + 1); 823 if (in6_setscope(&ip6a->ip6a_src, ia->ia_ifp, &ip6a->ip6a_scope_id)) { 824 IP6_STATINC(IP6_STAT_BADSCOPE); 825 return NULL; 826 } 827 828 ip6a->ip6a_src = ia->ia_addr.sin6_addr; 829 ip6a->ip6a_flags = ia->ia6_flags; 830 return mtag; 831 } 832 833 const struct ip6aux * 834 ip6_getdstifaddr(struct mbuf *m) 835 { 836 struct m_tag *mtag; 837 838 mtag = ip6_findaux(m); 839 if (mtag != NULL) 840 return (struct ip6aux *)(mtag + 1); 841 else 842 return NULL; 843 } 844 845 /* 846 * Hop-by-Hop options header processing. If a valid jumbo payload option is 847 * included, the real payload length will be stored in plenp. 848 * 849 * rtalertp - XXX: should be stored more smart way 850 */ 851 int 852 ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp, 853 struct mbuf **mp, int *offp) 854 { 855 struct mbuf *m = *mp; 856 int off = *offp, hbhlen; 857 struct ip6_hbh *hbh; 858 859 /* validation of the length of the header */ 860 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, 861 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh)); 862 if (hbh == NULL) { 863 IP6_STATINC(IP6_STAT_TOOSHORT); 864 return -1; 865 } 866 hbhlen = (hbh->ip6h_len + 1) << 3; 867 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 868 hbhlen); 869 if (hbh == NULL) { 870 IP6_STATINC(IP6_STAT_TOOSHORT); 871 return -1; 872 } 873 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 874 off += hbhlen; 875 hbhlen -= sizeof(struct ip6_hbh); 876 877 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 878 hbhlen, rtalertp, plenp) < 0) 879 return (-1); 880 881 *offp = off; 882 *mp = m; 883 return (0); 884 } 885 886 /* 887 * Search header for all Hop-by-hop options and process each option. 888 * This function is separate from ip6_hopopts_input() in order to 889 * handle a case where the sending node itself process its hop-by-hop 890 * options header. In such a case, the function is called from ip6_output(). 891 * 892 * The function assumes that hbh header is located right after the IPv6 header 893 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to 894 * opthead + hbhlen is located in continuous memory region. 895 */ 896 static int 897 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen, 898 u_int32_t *rtalertp, u_int32_t *plenp) 899 { 900 struct ip6_hdr *ip6; 901 int optlen = 0; 902 u_int8_t *opt = opthead; 903 u_int16_t rtalert_val; 904 u_int32_t jumboplen; 905 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh); 906 907 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 908 switch (*opt) { 909 case IP6OPT_PAD1: 910 optlen = 1; 911 break; 912 case IP6OPT_PADN: 913 if (hbhlen < IP6OPT_MINLEN) { 914 IP6_STATINC(IP6_STAT_TOOSMALL); 915 goto bad; 916 } 917 optlen = *(opt + 1) + 2; 918 break; 919 case IP6OPT_RTALERT: 920 /* XXX may need check for alignment */ 921 if (hbhlen < IP6OPT_RTALERT_LEN) { 922 IP6_STATINC(IP6_STAT_TOOSMALL); 923 goto bad; 924 } 925 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) { 926 /* XXX stat */ 927 icmp6_error(m, ICMP6_PARAM_PROB, 928 ICMP6_PARAMPROB_HEADER, 929 erroff + opt + 1 - opthead); 930 return (-1); 931 } 932 optlen = IP6OPT_RTALERT_LEN; 933 memcpy((void *)&rtalert_val, (void *)(opt + 2), 2); 934 *rtalertp = ntohs(rtalert_val); 935 break; 936 case IP6OPT_JUMBO: 937 /* XXX may need check for alignment */ 938 if (hbhlen < IP6OPT_JUMBO_LEN) { 939 IP6_STATINC(IP6_STAT_TOOSMALL); 940 goto bad; 941 } 942 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) { 943 /* XXX stat */ 944 icmp6_error(m, ICMP6_PARAM_PROB, 945 ICMP6_PARAMPROB_HEADER, 946 erroff + opt + 1 - opthead); 947 return (-1); 948 } 949 optlen = IP6OPT_JUMBO_LEN; 950 951 /* 952 * IPv6 packets that have non 0 payload length 953 * must not contain a jumbo payload option. 954 */ 955 ip6 = mtod(m, struct ip6_hdr *); 956 if (ip6->ip6_plen) { 957 IP6_STATINC(IP6_STAT_BADOPTIONS); 958 icmp6_error(m, ICMP6_PARAM_PROB, 959 ICMP6_PARAMPROB_HEADER, 960 erroff + opt - opthead); 961 return (-1); 962 } 963 964 /* 965 * We may see jumbolen in unaligned location, so 966 * we'd need to perform bcopy(). 967 */ 968 memcpy(&jumboplen, opt + 2, sizeof(jumboplen)); 969 jumboplen = (u_int32_t)htonl(jumboplen); 970 971 #if 1 972 /* 973 * if there are multiple jumbo payload options, 974 * *plenp will be non-zero and the packet will be 975 * rejected. 976 * the behavior may need some debate in ipngwg - 977 * multiple options does not make sense, however, 978 * there's no explicit mention in specification. 979 */ 980 if (*plenp != 0) { 981 IP6_STATINC(IP6_STAT_BADOPTIONS); 982 icmp6_error(m, ICMP6_PARAM_PROB, 983 ICMP6_PARAMPROB_HEADER, 984 erroff + opt + 2 - opthead); 985 return (-1); 986 } 987 #endif 988 989 /* 990 * jumbo payload length must be larger than 65535. 991 */ 992 if (jumboplen <= IPV6_MAXPACKET) { 993 IP6_STATINC(IP6_STAT_BADOPTIONS); 994 icmp6_error(m, ICMP6_PARAM_PROB, 995 ICMP6_PARAMPROB_HEADER, 996 erroff + opt + 2 - opthead); 997 return (-1); 998 } 999 *plenp = jumboplen; 1000 1001 break; 1002 default: /* unknown option */ 1003 if (hbhlen < IP6OPT_MINLEN) { 1004 IP6_STATINC(IP6_STAT_TOOSMALL); 1005 goto bad; 1006 } 1007 optlen = ip6_unknown_opt(opt, m, 1008 erroff + opt - opthead); 1009 if (optlen == -1) 1010 return (-1); 1011 optlen += 2; 1012 break; 1013 } 1014 } 1015 1016 return (0); 1017 1018 bad: 1019 m_freem(m); 1020 return (-1); 1021 } 1022 1023 /* 1024 * Unknown option processing. 1025 * The third argument `off' is the offset from the IPv6 header to the option, 1026 * which is necessary if the IPv6 header the and option header and IPv6 header 1027 * is not continuous in order to return an ICMPv6 error. 1028 */ 1029 int 1030 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off) 1031 { 1032 struct ip6_hdr *ip6; 1033 1034 switch (IP6OPT_TYPE(*optp)) { 1035 case IP6OPT_TYPE_SKIP: /* ignore the option */ 1036 return ((int)*(optp + 1)); 1037 case IP6OPT_TYPE_DISCARD: /* silently discard */ 1038 m_freem(m); 1039 return (-1); 1040 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 1041 IP6_STATINC(IP6_STAT_BADOPTIONS); 1042 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 1043 return (-1); 1044 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 1045 IP6_STATINC(IP6_STAT_BADOPTIONS); 1046 ip6 = mtod(m, struct ip6_hdr *); 1047 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 1048 (m->m_flags & (M_BCAST|M_MCAST))) 1049 m_freem(m); 1050 else 1051 icmp6_error(m, ICMP6_PARAM_PROB, 1052 ICMP6_PARAMPROB_OPTION, off); 1053 return (-1); 1054 } 1055 1056 m_freem(m); /* XXX: NOTREACHED */ 1057 return (-1); 1058 } 1059 1060 /* 1061 * Create the "control" list for this pcb. 1062 * 1063 * The routine will be called from upper layer handlers like tcp6_input(). 1064 * Thus the routine assumes that the caller (tcp6_input) have already 1065 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the 1066 * very first mbuf on the mbuf chain. 1067 * We may want to add some infinite loop prevention or sanity checks for safety. 1068 * (This applies only when you are using KAME mbuf chain restriction, i.e. 1069 * you are using IP6_EXTHDR_CHECK() not m_pulldown()) 1070 */ 1071 void 1072 ip6_savecontrol(struct in6pcb *in6p, struct mbuf **mp, 1073 struct ip6_hdr *ip6, struct mbuf *m) 1074 { 1075 #ifdef RFC2292 1076 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y)) 1077 #else 1078 #define IS2292(x, y) (y) 1079 #endif 1080 1081 if (in6p->in6p_socket->so_options & SO_TIMESTAMP 1082 #ifdef SO_OTIMESTAMP 1083 || in6p->in6p_socket->so_options & SO_OTIMESTAMP 1084 #endif 1085 ) { 1086 struct timeval tv; 1087 1088 microtime(&tv); 1089 #ifdef SO_OTIMESTAMP 1090 if (in6p->in6p_socket->so_options & SO_OTIMESTAMP) { 1091 struct timeval50 tv50; 1092 timeval_to_timeval50(&tv, &tv50); 1093 *mp = sbcreatecontrol((void *) &tv50, sizeof(tv50), 1094 SCM_OTIMESTAMP, SOL_SOCKET); 1095 } else 1096 #endif 1097 *mp = sbcreatecontrol((void *) &tv, sizeof(tv), 1098 SCM_TIMESTAMP, SOL_SOCKET); 1099 if (*mp) 1100 mp = &(*mp)->m_next; 1101 } 1102 1103 /* some OSes call this logic with IPv4 packet, for SO_TIMESTAMP */ 1104 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) 1105 return; 1106 1107 /* RFC 2292 sec. 5 */ 1108 if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) { 1109 struct in6_pktinfo pi6; 1110 1111 memcpy(&pi6.ipi6_addr, &ip6->ip6_dst, sizeof(struct in6_addr)); 1112 in6_clearscope(&pi6.ipi6_addr); /* XXX */ 1113 pi6.ipi6_ifindex = m->m_pkthdr.rcvif ? 1114 m->m_pkthdr.rcvif->if_index : 0; 1115 *mp = sbcreatecontrol((void *) &pi6, 1116 sizeof(struct in6_pktinfo), 1117 IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6); 1118 if (*mp) 1119 mp = &(*mp)->m_next; 1120 } 1121 1122 if (in6p->in6p_flags & IN6P_HOPLIMIT) { 1123 int hlim = ip6->ip6_hlim & 0xff; 1124 1125 *mp = sbcreatecontrol((void *) &hlim, sizeof(int), 1126 IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6); 1127 if (*mp) 1128 mp = &(*mp)->m_next; 1129 } 1130 1131 if ((in6p->in6p_flags & IN6P_TCLASS) != 0) { 1132 u_int32_t flowinfo; 1133 int tclass; 1134 1135 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK); 1136 flowinfo >>= 20; 1137 1138 tclass = flowinfo & 0xff; 1139 *mp = sbcreatecontrol((void *)&tclass, sizeof(tclass), 1140 IPV6_TCLASS, IPPROTO_IPV6); 1141 1142 if (*mp) 1143 mp = &(*mp)->m_next; 1144 } 1145 1146 /* 1147 * IPV6_HOPOPTS socket option. Recall that we required super-user 1148 * privilege for the option (see ip6_ctloutput), but it might be too 1149 * strict, since there might be some hop-by-hop options which can be 1150 * returned to normal user. 1151 * See also RFC3542 section 8 (or RFC2292 section 6). 1152 */ 1153 if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0) { 1154 /* 1155 * Check if a hop-by-hop options header is contatined in the 1156 * received packet, and if so, store the options as ancillary 1157 * data. Note that a hop-by-hop options header must be 1158 * just after the IPv6 header, which fact is assured through 1159 * the IPv6 input processing. 1160 */ 1161 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1162 if (xip6->ip6_nxt == IPPROTO_HOPOPTS) { 1163 struct ip6_hbh *hbh; 1164 int hbhlen; 1165 struct mbuf *ext; 1166 1167 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr), 1168 xip6->ip6_nxt); 1169 if (ext == NULL) { 1170 IP6_STATINC(IP6_STAT_TOOSHORT); 1171 return; 1172 } 1173 hbh = mtod(ext, struct ip6_hbh *); 1174 hbhlen = (hbh->ip6h_len + 1) << 3; 1175 if (hbhlen != ext->m_len) { 1176 m_freem(ext); 1177 IP6_STATINC(IP6_STAT_TOOSHORT); 1178 return; 1179 } 1180 1181 /* 1182 * XXX: We copy whole the header even if a jumbo 1183 * payload option is included, which option is to 1184 * be removed before returning in the RFC 2292. 1185 * Note: this constraint is removed in RFC3542. 1186 */ 1187 *mp = sbcreatecontrol((void *)hbh, hbhlen, 1188 IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS), 1189 IPPROTO_IPV6); 1190 if (*mp) 1191 mp = &(*mp)->m_next; 1192 m_freem(ext); 1193 } 1194 } 1195 1196 /* IPV6_DSTOPTS and IPV6_RTHDR socket options */ 1197 if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) { 1198 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1199 int nxt = xip6->ip6_nxt, off = sizeof(struct ip6_hdr); 1200 1201 /* 1202 * Search for destination options headers or routing 1203 * header(s) through the header chain, and stores each 1204 * header as ancillary data. 1205 * Note that the order of the headers remains in 1206 * the chain of ancillary data. 1207 */ 1208 for (;;) { /* is explicit loop prevention necessary? */ 1209 struct ip6_ext *ip6e = NULL; 1210 int elen; 1211 struct mbuf *ext = NULL; 1212 1213 /* 1214 * if it is not an extension header, don't try to 1215 * pull it from the chain. 1216 */ 1217 switch (nxt) { 1218 case IPPROTO_DSTOPTS: 1219 case IPPROTO_ROUTING: 1220 case IPPROTO_HOPOPTS: 1221 case IPPROTO_AH: /* is it possible? */ 1222 break; 1223 default: 1224 goto loopend; 1225 } 1226 1227 ext = ip6_pullexthdr(m, off, nxt); 1228 if (ext == NULL) { 1229 IP6_STATINC(IP6_STAT_TOOSHORT); 1230 return; 1231 } 1232 ip6e = mtod(ext, struct ip6_ext *); 1233 if (nxt == IPPROTO_AH) 1234 elen = (ip6e->ip6e_len + 2) << 2; 1235 else 1236 elen = (ip6e->ip6e_len + 1) << 3; 1237 if (elen != ext->m_len) { 1238 m_freem(ext); 1239 IP6_STATINC(IP6_STAT_TOOSHORT); 1240 return; 1241 } 1242 KASSERT(IP6_HDR_ALIGNED_P(ip6e)); 1243 1244 switch (nxt) { 1245 case IPPROTO_DSTOPTS: 1246 if (!(in6p->in6p_flags & IN6P_DSTOPTS)) 1247 break; 1248 1249 *mp = sbcreatecontrol((void *)ip6e, elen, 1250 IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS), 1251 IPPROTO_IPV6); 1252 if (*mp) 1253 mp = &(*mp)->m_next; 1254 break; 1255 1256 case IPPROTO_ROUTING: 1257 if (!(in6p->in6p_flags & IN6P_RTHDR)) 1258 break; 1259 1260 *mp = sbcreatecontrol((void *)ip6e, elen, 1261 IS2292(IPV6_2292RTHDR, IPV6_RTHDR), 1262 IPPROTO_IPV6); 1263 if (*mp) 1264 mp = &(*mp)->m_next; 1265 break; 1266 1267 case IPPROTO_HOPOPTS: 1268 case IPPROTO_AH: /* is it possible? */ 1269 break; 1270 1271 default: 1272 /* 1273 * other cases have been filtered in the above. 1274 * none will visit this case. here we supply 1275 * the code just in case (nxt overwritten or 1276 * other cases). 1277 */ 1278 m_freem(ext); 1279 goto loopend; 1280 1281 } 1282 1283 /* proceed with the next header. */ 1284 off += elen; 1285 nxt = ip6e->ip6e_nxt; 1286 ip6e = NULL; 1287 m_freem(ext); 1288 ext = NULL; 1289 } 1290 loopend: 1291 ; 1292 } 1293 } 1294 #undef IS2292 1295 1296 1297 void 1298 ip6_notify_pmtu(struct in6pcb *in6p, const struct sockaddr_in6 *dst, 1299 uint32_t *mtu) 1300 { 1301 struct socket *so; 1302 struct mbuf *m_mtu; 1303 struct ip6_mtuinfo mtuctl; 1304 1305 so = in6p->in6p_socket; 1306 1307 if (mtu == NULL) 1308 return; 1309 1310 #ifdef DIAGNOSTIC 1311 if (so == NULL) /* I believe this is impossible */ 1312 panic("ip6_notify_pmtu: socket is NULL"); 1313 #endif 1314 1315 memset(&mtuctl, 0, sizeof(mtuctl)); /* zero-clear for safety */ 1316 mtuctl.ip6m_mtu = *mtu; 1317 mtuctl.ip6m_addr = *dst; 1318 if (sa6_recoverscope(&mtuctl.ip6m_addr)) 1319 return; 1320 1321 if ((m_mtu = sbcreatecontrol((void *)&mtuctl, sizeof(mtuctl), 1322 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL) 1323 return; 1324 1325 if (sbappendaddr(&so->so_rcv, (const struct sockaddr *)dst, NULL, m_mtu) 1326 == 0) { 1327 m_freem(m_mtu); 1328 /* XXX: should count statistics */ 1329 } else 1330 sorwakeup(so); 1331 1332 return; 1333 } 1334 1335 /* 1336 * pull single extension header from mbuf chain. returns single mbuf that 1337 * contains the result, or NULL on error. 1338 */ 1339 static struct mbuf * 1340 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt) 1341 { 1342 struct ip6_ext ip6e; 1343 size_t elen; 1344 struct mbuf *n; 1345 1346 #ifdef DIAGNOSTIC 1347 switch (nxt) { 1348 case IPPROTO_DSTOPTS: 1349 case IPPROTO_ROUTING: 1350 case IPPROTO_HOPOPTS: 1351 case IPPROTO_AH: /* is it possible? */ 1352 break; 1353 default: 1354 printf("ip6_pullexthdr: invalid nxt=%d\n", nxt); 1355 } 1356 #endif 1357 1358 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1359 if (nxt == IPPROTO_AH) 1360 elen = (ip6e.ip6e_len + 2) << 2; 1361 else 1362 elen = (ip6e.ip6e_len + 1) << 3; 1363 1364 MGET(n, M_DONTWAIT, MT_DATA); 1365 if (n && elen >= MLEN) { 1366 MCLGET(n, M_DONTWAIT); 1367 if ((n->m_flags & M_EXT) == 0) { 1368 m_free(n); 1369 n = NULL; 1370 } 1371 } 1372 if (!n) 1373 return NULL; 1374 1375 n->m_len = 0; 1376 if (elen >= M_TRAILINGSPACE(n)) { 1377 m_free(n); 1378 return NULL; 1379 } 1380 1381 m_copydata(m, off, elen, mtod(n, void *)); 1382 n->m_len = elen; 1383 return n; 1384 } 1385 1386 /* 1387 * Get pointer to the previous header followed by the header 1388 * currently processed. 1389 * XXX: This function supposes that 1390 * M includes all headers, 1391 * the next header field and the header length field of each header 1392 * are valid, and 1393 * the sum of each header length equals to OFF. 1394 * Because of these assumptions, this function must be called very 1395 * carefully. Moreover, it will not be used in the near future when 1396 * we develop `neater' mechanism to process extension headers. 1397 */ 1398 u_int8_t * 1399 ip6_get_prevhdr(struct mbuf *m, int off) 1400 { 1401 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1402 1403 if (off == sizeof(struct ip6_hdr)) 1404 return (&ip6->ip6_nxt); 1405 else { 1406 int len, nxt; 1407 struct ip6_ext *ip6e = NULL; 1408 1409 nxt = ip6->ip6_nxt; 1410 len = sizeof(struct ip6_hdr); 1411 while (len < off) { 1412 ip6e = (struct ip6_ext *)(mtod(m, char *) + len); 1413 1414 switch (nxt) { 1415 case IPPROTO_FRAGMENT: 1416 len += sizeof(struct ip6_frag); 1417 break; 1418 case IPPROTO_AH: 1419 len += (ip6e->ip6e_len + 2) << 2; 1420 break; 1421 default: 1422 len += (ip6e->ip6e_len + 1) << 3; 1423 break; 1424 } 1425 nxt = ip6e->ip6e_nxt; 1426 } 1427 if (ip6e) 1428 return (&ip6e->ip6e_nxt); 1429 else 1430 return NULL; 1431 } 1432 } 1433 1434 /* 1435 * get next header offset. m will be retained. 1436 */ 1437 int 1438 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp) 1439 { 1440 struct ip6_hdr ip6; 1441 struct ip6_ext ip6e; 1442 struct ip6_frag fh; 1443 1444 /* just in case */ 1445 if (m == NULL) 1446 panic("ip6_nexthdr: m == NULL"); 1447 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off) 1448 return -1; 1449 1450 switch (proto) { 1451 case IPPROTO_IPV6: 1452 /* do not chase beyond intermediate IPv6 headers */ 1453 if (off != 0) 1454 return -1; 1455 if (m->m_pkthdr.len < off + sizeof(ip6)) 1456 return -1; 1457 m_copydata(m, off, sizeof(ip6), (void *)&ip6); 1458 if (nxtp) 1459 *nxtp = ip6.ip6_nxt; 1460 off += sizeof(ip6); 1461 return off; 1462 1463 case IPPROTO_FRAGMENT: 1464 /* 1465 * terminate parsing if it is not the first fragment, 1466 * it does not make sense to parse through it. 1467 */ 1468 if (m->m_pkthdr.len < off + sizeof(fh)) 1469 return -1; 1470 m_copydata(m, off, sizeof(fh), (void *)&fh); 1471 if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0) 1472 return -1; 1473 if (nxtp) 1474 *nxtp = fh.ip6f_nxt; 1475 off += sizeof(struct ip6_frag); 1476 return off; 1477 1478 case IPPROTO_AH: 1479 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1480 return -1; 1481 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1482 if (nxtp) 1483 *nxtp = ip6e.ip6e_nxt; 1484 off += (ip6e.ip6e_len + 2) << 2; 1485 if (m->m_pkthdr.len < off) 1486 return -1; 1487 return off; 1488 1489 case IPPROTO_HOPOPTS: 1490 case IPPROTO_ROUTING: 1491 case IPPROTO_DSTOPTS: 1492 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1493 return -1; 1494 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1495 if (nxtp) 1496 *nxtp = ip6e.ip6e_nxt; 1497 off += (ip6e.ip6e_len + 1) << 3; 1498 if (m->m_pkthdr.len < off) 1499 return -1; 1500 return off; 1501 1502 case IPPROTO_NONE: 1503 case IPPROTO_ESP: 1504 case IPPROTO_IPCOMP: 1505 /* give up */ 1506 return -1; 1507 1508 default: 1509 return -1; 1510 } 1511 } 1512 1513 /* 1514 * get offset for the last header in the chain. m will be kept untainted. 1515 */ 1516 int 1517 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp) 1518 { 1519 int newoff; 1520 int nxt; 1521 1522 if (!nxtp) { 1523 nxt = -1; 1524 nxtp = &nxt; 1525 } 1526 for (;;) { 1527 newoff = ip6_nexthdr(m, off, proto, nxtp); 1528 if (newoff < 0) 1529 return off; 1530 else if (newoff < off) 1531 return -1; /* invalid */ 1532 else if (newoff == off) 1533 return newoff; 1534 1535 off = newoff; 1536 proto = *nxtp; 1537 } 1538 } 1539 1540 struct m_tag * 1541 ip6_addaux(struct mbuf *m) 1542 { 1543 struct m_tag *mtag; 1544 1545 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1546 if (!mtag) { 1547 mtag = m_tag_get(PACKET_TAG_INET6, sizeof(struct ip6aux), 1548 M_NOWAIT); 1549 if (mtag) { 1550 m_tag_prepend(m, mtag); 1551 memset(mtag + 1, 0, sizeof(struct ip6aux)); 1552 } 1553 } 1554 return mtag; 1555 } 1556 1557 struct m_tag * 1558 ip6_findaux(struct mbuf *m) 1559 { 1560 struct m_tag *mtag; 1561 1562 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1563 return mtag; 1564 } 1565 1566 void 1567 ip6_delaux(struct mbuf *m) 1568 { 1569 struct m_tag *mtag; 1570 1571 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1572 if (mtag) 1573 m_tag_delete(m, mtag); 1574 } 1575 1576 #ifdef GATEWAY 1577 /* 1578 * sysctl helper routine for net.inet.ip6.maxflows. Since 1579 * we could reduce this value, call ip6flow_reap(); 1580 */ 1581 static int 1582 sysctl_net_inet6_ip6_maxflows(SYSCTLFN_ARGS) 1583 { 1584 int error; 1585 1586 error = sysctl_lookup(SYSCTLFN_CALL(rnode)); 1587 if (error || newp == NULL) 1588 return (error); 1589 1590 mutex_enter(softnet_lock); 1591 KERNEL_LOCK(1, NULL); 1592 1593 ip6flow_reap(0); 1594 1595 KERNEL_UNLOCK_ONE(NULL); 1596 mutex_exit(softnet_lock); 1597 1598 return (0); 1599 } 1600 1601 static int 1602 sysctl_net_inet6_ip6_hashsize(SYSCTLFN_ARGS) 1603 { 1604 int error, tmp; 1605 struct sysctlnode node; 1606 1607 node = *rnode; 1608 tmp = ip6_hashsize; 1609 node.sysctl_data = &tmp; 1610 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 1611 if (error || newp == NULL) 1612 return (error); 1613 1614 if ((tmp & (tmp - 1)) == 0 && tmp != 0) { 1615 /* 1616 * Can only fail due to malloc() 1617 */ 1618 mutex_enter(softnet_lock); 1619 KERNEL_LOCK(1, NULL); 1620 1621 error = ip6flow_invalidate_all(tmp); 1622 1623 KERNEL_UNLOCK_ONE(NULL); 1624 mutex_exit(softnet_lock); 1625 } else { 1626 /* 1627 * EINVAL if not a power of 2 1628 */ 1629 error = EINVAL; 1630 } 1631 1632 return error; 1633 } 1634 #endif /* GATEWAY */ 1635 1636 /* 1637 * System control for IP6 1638 */ 1639 1640 const 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 int 1650 sysctl_net_inet6_ip6_stats(SYSCTLFN_ARGS) 1651 { 1652 1653 return (NETSTAT_SYSCTL(ip6stat_percpu, IP6_NSTATS)); 1654 } 1655 1656 static void 1657 sysctl_net_inet6_ip6_setup(struct sysctllog **clog) 1658 { 1659 #ifdef RFC2292 1660 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y)) 1661 #else 1662 #define IS2292(x, y) (y) 1663 #endif 1664 1665 sysctl_createv(clog, 0, NULL, NULL, 1666 CTLFLAG_PERMANENT, 1667 CTLTYPE_NODE, "inet6", 1668 SYSCTL_DESCR("PF_INET6 related settings"), 1669 NULL, 0, NULL, 0, 1670 CTL_NET, PF_INET6, CTL_EOL); 1671 sysctl_createv(clog, 0, NULL, NULL, 1672 CTLFLAG_PERMANENT, 1673 CTLTYPE_NODE, "ip6", 1674 SYSCTL_DESCR("IPv6 related settings"), 1675 NULL, 0, NULL, 0, 1676 CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_EOL); 1677 1678 sysctl_createv(clog, 0, NULL, NULL, 1679 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1680 CTLTYPE_INT, "forwarding", 1681 SYSCTL_DESCR("Enable forwarding of INET6 datagrams"), 1682 NULL, 0, &ip6_forwarding, 0, 1683 CTL_NET, PF_INET6, IPPROTO_IPV6, 1684 IPV6CTL_FORWARDING, CTL_EOL); 1685 sysctl_createv(clog, 0, NULL, NULL, 1686 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1687 CTLTYPE_INT, "redirect", 1688 SYSCTL_DESCR("Enable sending of ICMPv6 redirect messages"), 1689 NULL, 0, &ip6_sendredirects, 0, 1690 CTL_NET, PF_INET6, IPPROTO_IPV6, 1691 IPV6CTL_SENDREDIRECTS, CTL_EOL); 1692 sysctl_createv(clog, 0, NULL, NULL, 1693 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1694 CTLTYPE_INT, "hlim", 1695 SYSCTL_DESCR("Hop limit for an INET6 datagram"), 1696 NULL, 0, &ip6_defhlim, 0, 1697 CTL_NET, PF_INET6, IPPROTO_IPV6, 1698 IPV6CTL_DEFHLIM, CTL_EOL); 1699 #ifdef notyet 1700 sysctl_createv(clog, 0, NULL, NULL, 1701 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1702 CTLTYPE_INT, "mtu", NULL, 1703 NULL, 0, &, 0, 1704 CTL_NET, PF_INET6, IPPROTO_IPV6, 1705 IPV6CTL_DEFMTU, CTL_EOL); 1706 #endif 1707 #ifdef __no_idea__ 1708 sysctl_createv(clog, 0, NULL, NULL, 1709 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1710 CTLTYPE_INT, "forwsrcrt", NULL, 1711 NULL, 0, &?, 0, 1712 CTL_NET, PF_INET6, IPPROTO_IPV6, 1713 IPV6CTL_FORWSRCRT, CTL_EOL); 1714 sysctl_createv(clog, 0, NULL, NULL, 1715 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1716 CTLTYPE_STRUCT, "mrtstats", NULL, 1717 NULL, 0, &?, sizeof(?), 1718 CTL_NET, PF_INET6, IPPROTO_IPV6, 1719 IPV6CTL_MRTSTATS, CTL_EOL); 1720 sysctl_createv(clog, 0, NULL, NULL, 1721 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1722 CTLTYPE_?, "mrtproto", NULL, 1723 NULL, 0, &?, sizeof(?), 1724 CTL_NET, PF_INET6, IPPROTO_IPV6, 1725 IPV6CTL_MRTPROTO, CTL_EOL); 1726 #endif 1727 sysctl_createv(clog, 0, NULL, NULL, 1728 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1729 CTLTYPE_INT, "maxfragpackets", 1730 SYSCTL_DESCR("Maximum number of fragments to buffer " 1731 "for reassembly"), 1732 NULL, 0, &ip6_maxfragpackets, 0, 1733 CTL_NET, PF_INET6, IPPROTO_IPV6, 1734 IPV6CTL_MAXFRAGPACKETS, CTL_EOL); 1735 #ifdef __no_idea__ 1736 sysctl_createv(clog, 0, NULL, NULL, 1737 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1738 CTLTYPE_INT, "sourcecheck", NULL, 1739 NULL, 0, &?, 0, 1740 CTL_NET, PF_INET6, IPPROTO_IPV6, 1741 IPV6CTL_SOURCECHECK, CTL_EOL); 1742 sysctl_createv(clog, 0, NULL, NULL, 1743 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1744 CTLTYPE_INT, "sourcecheck_logint", NULL, 1745 NULL, 0, &?, 0, 1746 CTL_NET, PF_INET6, IPPROTO_IPV6, 1747 IPV6CTL_SOURCECHECK_LOGINT, CTL_EOL); 1748 #endif 1749 sysctl_createv(clog, 0, NULL, NULL, 1750 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1751 CTLTYPE_INT, "accept_rtadv", 1752 SYSCTL_DESCR("Accept router advertisements"), 1753 NULL, 0, &ip6_accept_rtadv, 0, 1754 CTL_NET, PF_INET6, IPPROTO_IPV6, 1755 IPV6CTL_ACCEPT_RTADV, CTL_EOL); 1756 sysctl_createv(clog, 0, NULL, NULL, 1757 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1758 CTLTYPE_INT, "rtadv_maxroutes", 1759 SYSCTL_DESCR("Maximum number of routes accepted via router advertisements"), 1760 NULL, 0, &ip6_rtadv_maxroutes, 0, 1761 CTL_NET, PF_INET6, IPPROTO_IPV6, 1762 IPV6CTL_RTADV_MAXROUTES, CTL_EOL); 1763 sysctl_createv(clog, 0, NULL, NULL, 1764 CTLFLAG_PERMANENT, 1765 CTLTYPE_INT, "rtadv_numroutes", 1766 SYSCTL_DESCR("Current number of routes accepted via router advertisements"), 1767 NULL, 0, &nd6_numroutes, 0, 1768 CTL_NET, PF_INET6, IPPROTO_IPV6, 1769 IPV6CTL_RTADV_NUMROUTES, CTL_EOL); 1770 sysctl_createv(clog, 0, NULL, NULL, 1771 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1772 CTLTYPE_INT, "keepfaith", 1773 SYSCTL_DESCR("Activate faith interface"), 1774 NULL, 0, &ip6_keepfaith, 0, 1775 CTL_NET, PF_INET6, IPPROTO_IPV6, 1776 IPV6CTL_KEEPFAITH, CTL_EOL); 1777 sysctl_createv(clog, 0, NULL, NULL, 1778 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1779 CTLTYPE_INT, "log_interval", 1780 SYSCTL_DESCR("Minumum interval between logging " 1781 "unroutable packets"), 1782 NULL, 0, &ip6_log_interval, 0, 1783 CTL_NET, PF_INET6, IPPROTO_IPV6, 1784 IPV6CTL_LOG_INTERVAL, CTL_EOL); 1785 sysctl_createv(clog, 0, NULL, NULL, 1786 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1787 CTLTYPE_INT, "hdrnestlimit", 1788 SYSCTL_DESCR("Maximum number of nested IPv6 headers"), 1789 NULL, 0, &ip6_hdrnestlimit, 0, 1790 CTL_NET, PF_INET6, IPPROTO_IPV6, 1791 IPV6CTL_HDRNESTLIMIT, CTL_EOL); 1792 sysctl_createv(clog, 0, NULL, NULL, 1793 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1794 CTLTYPE_INT, "dad_count", 1795 SYSCTL_DESCR("Number of Duplicate Address Detection " 1796 "probes to send"), 1797 NULL, 0, &ip6_dad_count, 0, 1798 CTL_NET, PF_INET6, IPPROTO_IPV6, 1799 IPV6CTL_DAD_COUNT, CTL_EOL); 1800 sysctl_createv(clog, 0, NULL, NULL, 1801 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1802 CTLTYPE_INT, "auto_flowlabel", 1803 SYSCTL_DESCR("Assign random IPv6 flow labels"), 1804 NULL, 0, &ip6_auto_flowlabel, 0, 1805 CTL_NET, PF_INET6, IPPROTO_IPV6, 1806 IPV6CTL_AUTO_FLOWLABEL, CTL_EOL); 1807 sysctl_createv(clog, 0, NULL, NULL, 1808 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1809 CTLTYPE_INT, "defmcasthlim", 1810 SYSCTL_DESCR("Default multicast hop limit"), 1811 NULL, 0, &ip6_defmcasthlim, 0, 1812 CTL_NET, PF_INET6, IPPROTO_IPV6, 1813 IPV6CTL_DEFMCASTHLIM, CTL_EOL); 1814 #if NGIF > 0 1815 sysctl_createv(clog, 0, NULL, NULL, 1816 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1817 CTLTYPE_INT, "gifhlim", 1818 SYSCTL_DESCR("Default hop limit for a gif tunnel datagram"), 1819 NULL, 0, &ip6_gif_hlim, 0, 1820 CTL_NET, PF_INET6, IPPROTO_IPV6, 1821 IPV6CTL_GIF_HLIM, CTL_EOL); 1822 #endif /* NGIF */ 1823 sysctl_createv(clog, 0, NULL, NULL, 1824 CTLFLAG_PERMANENT, 1825 CTLTYPE_STRING, "kame_version", 1826 SYSCTL_DESCR("KAME Version"), 1827 NULL, 0, __UNCONST(__KAME_VERSION), 0, 1828 CTL_NET, PF_INET6, IPPROTO_IPV6, 1829 IPV6CTL_KAME_VERSION, CTL_EOL); 1830 sysctl_createv(clog, 0, NULL, NULL, 1831 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1832 CTLTYPE_INT, "use_deprecated", 1833 SYSCTL_DESCR("Allow use of deprecated addresses as " 1834 "source addresses"), 1835 NULL, 0, &ip6_use_deprecated, 0, 1836 CTL_NET, PF_INET6, IPPROTO_IPV6, 1837 IPV6CTL_USE_DEPRECATED, CTL_EOL); 1838 sysctl_createv(clog, 0, NULL, NULL, 1839 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1840 CTLTYPE_INT, "rr_prune", NULL, 1841 NULL, 0, &ip6_rr_prune, 0, 1842 CTL_NET, PF_INET6, IPPROTO_IPV6, 1843 IPV6CTL_RR_PRUNE, CTL_EOL); 1844 sysctl_createv(clog, 0, NULL, NULL, 1845 CTLFLAG_PERMANENT 1846 #ifndef INET6_BINDV6ONLY 1847 |CTLFLAG_READWRITE, 1848 #endif 1849 CTLTYPE_INT, "v6only", 1850 SYSCTL_DESCR("Disallow PF_INET6 sockets from connecting " 1851 "to PF_INET sockets"), 1852 NULL, 0, &ip6_v6only, 0, 1853 CTL_NET, PF_INET6, IPPROTO_IPV6, 1854 IPV6CTL_V6ONLY, CTL_EOL); 1855 sysctl_createv(clog, 0, NULL, NULL, 1856 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1857 CTLTYPE_INT, "auto_linklocal", 1858 SYSCTL_DESCR("Default value of per-interface flag for " 1859 "adding an IPv6 link-local address to " 1860 "interfaces when attached"), 1861 NULL, 0, &ip6_auto_linklocal, 0, 1862 CTL_NET, PF_INET6, IPPROTO_IPV6, 1863 IPV6CTL_AUTO_LINKLOCAL, CTL_EOL); 1864 sysctl_createv(clog, 0, NULL, NULL, 1865 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1866 CTLTYPE_INT, "anonportmin", 1867 SYSCTL_DESCR("Lowest ephemeral port number to assign"), 1868 sysctl_net_inet_ip_ports, 0, &ip6_anonportmin, 0, 1869 CTL_NET, PF_INET6, IPPROTO_IPV6, 1870 IPV6CTL_ANONPORTMIN, CTL_EOL); 1871 sysctl_createv(clog, 0, NULL, NULL, 1872 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1873 CTLTYPE_INT, "anonportmax", 1874 SYSCTL_DESCR("Highest ephemeral port number to assign"), 1875 sysctl_net_inet_ip_ports, 0, &ip6_anonportmax, 0, 1876 CTL_NET, PF_INET6, IPPROTO_IPV6, 1877 IPV6CTL_ANONPORTMAX, CTL_EOL); 1878 #ifndef IPNOPRIVPORTS 1879 sysctl_createv(clog, 0, NULL, NULL, 1880 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1881 CTLTYPE_INT, "lowportmin", 1882 SYSCTL_DESCR("Lowest privileged ephemeral port number " 1883 "to assign"), 1884 sysctl_net_inet_ip_ports, 0, &ip6_lowportmin, 0, 1885 CTL_NET, PF_INET6, IPPROTO_IPV6, 1886 IPV6CTL_LOWPORTMIN, CTL_EOL); 1887 sysctl_createv(clog, 0, NULL, NULL, 1888 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1889 CTLTYPE_INT, "lowportmax", 1890 SYSCTL_DESCR("Highest privileged ephemeral port number " 1891 "to assign"), 1892 sysctl_net_inet_ip_ports, 0, &ip6_lowportmax, 0, 1893 CTL_NET, PF_INET6, IPPROTO_IPV6, 1894 IPV6CTL_LOWPORTMAX, CTL_EOL); 1895 #endif /* IPNOPRIVPORTS */ 1896 sysctl_createv(clog, 0, NULL, NULL, 1897 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1898 CTLTYPE_INT, "use_tempaddr", 1899 SYSCTL_DESCR("Use temporary address"), 1900 NULL, 0, &ip6_use_tempaddr, 0, 1901 CTL_NET, PF_INET6, IPPROTO_IPV6, 1902 CTL_CREATE, CTL_EOL); 1903 sysctl_createv(clog, 0, NULL, NULL, 1904 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1905 CTLTYPE_INT, "temppltime", 1906 SYSCTL_DESCR("preferred lifetime of a temporary address"), 1907 NULL, 0, &ip6_temp_preferred_lifetime, 0, 1908 CTL_NET, PF_INET6, IPPROTO_IPV6, 1909 CTL_CREATE, CTL_EOL); 1910 sysctl_createv(clog, 0, NULL, NULL, 1911 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1912 CTLTYPE_INT, "tempvltime", 1913 SYSCTL_DESCR("valid lifetime of a temporary address"), 1914 NULL, 0, &ip6_temp_valid_lifetime, 0, 1915 CTL_NET, PF_INET6, IPPROTO_IPV6, 1916 CTL_CREATE, CTL_EOL); 1917 sysctl_createv(clog, 0, NULL, NULL, 1918 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1919 CTLTYPE_INT, "maxfrags", 1920 SYSCTL_DESCR("Maximum fragments in reassembly queue"), 1921 NULL, 0, &ip6_maxfrags, 0, 1922 CTL_NET, PF_INET6, IPPROTO_IPV6, 1923 IPV6CTL_MAXFRAGS, CTL_EOL); 1924 sysctl_createv(clog, 0, NULL, NULL, 1925 CTLFLAG_PERMANENT, 1926 CTLTYPE_STRUCT, "stats", 1927 SYSCTL_DESCR("IPv6 statistics"), 1928 sysctl_net_inet6_ip6_stats, 0, NULL, 0, 1929 CTL_NET, PF_INET6, IPPROTO_IPV6, 1930 IPV6CTL_STATS, CTL_EOL); 1931 sysctl_createv(clog, 0, NULL, NULL, 1932 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1933 CTLTYPE_INT, "use_defaultzone", 1934 SYSCTL_DESCR("Whether to use the default scope zones"), 1935 NULL, 0, &ip6_use_defzone, 0, 1936 CTL_NET, PF_INET6, IPPROTO_IPV6, 1937 IPV6CTL_USE_DEFAULTZONE, CTL_EOL); 1938 sysctl_createv(clog, 0, NULL, NULL, 1939 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1940 CTLTYPE_INT, "mcast_pmtu", 1941 SYSCTL_DESCR("Enable pMTU discovery for multicast packet"), 1942 NULL, 0, &ip6_mcast_pmtu, 0, 1943 CTL_NET, PF_INET6, IPPROTO_IPV6, 1944 CTL_CREATE, CTL_EOL); 1945 #ifdef GATEWAY 1946 sysctl_createv(clog, 0, NULL, NULL, 1947 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1948 CTLTYPE_INT, "maxflows", 1949 SYSCTL_DESCR("Number of flows for fast forwarding (IPv6)"), 1950 sysctl_net_inet6_ip6_maxflows, 0, &ip6_maxflows, 0, 1951 CTL_NET, PF_INET6, IPPROTO_IPV6, 1952 CTL_CREATE, CTL_EOL); 1953 sysctl_createv(clog, 0, NULL, NULL, 1954 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1955 CTLTYPE_INT, "hashsize", 1956 SYSCTL_DESCR("Size of hash table for fast forwarding (IPv6)"), 1957 sysctl_net_inet6_ip6_hashsize, 0, &ip6_hashsize, 0, 1958 CTL_NET, PF_INET6, IPPROTO_IPV6, 1959 CTL_CREATE, CTL_EOL); 1960 #endif 1961 /* anonportalgo RFC6056 subtree */ 1962 const struct sysctlnode *portalgo_node; 1963 sysctl_createv(clog, 0, NULL, &portalgo_node, 1964 CTLFLAG_PERMANENT, 1965 CTLTYPE_NODE, "anonportalgo", 1966 SYSCTL_DESCR("Anonymous port algorithm selection (RFC 6056)"), 1967 NULL, 0, NULL, 0, 1968 CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_CREATE, CTL_EOL); 1969 sysctl_createv(clog, 0, &portalgo_node, NULL, 1970 CTLFLAG_PERMANENT, 1971 CTLTYPE_STRING, "available", 1972 SYSCTL_DESCR("available algorithms"), 1973 sysctl_portalgo_available, 0, NULL, PORTALGO_MAXLEN, 1974 CTL_CREATE, CTL_EOL); 1975 sysctl_createv(clog, 0, &portalgo_node, NULL, 1976 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1977 CTLTYPE_STRING, "selected", 1978 SYSCTL_DESCR("selected algorithm"), 1979 sysctl_portalgo_selected6, 0, NULL, PORTALGO_MAXLEN, 1980 CTL_CREATE, CTL_EOL); 1981 sysctl_createv(clog, 0, &portalgo_node, NULL, 1982 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1983 CTLTYPE_STRUCT, "reserve", 1984 SYSCTL_DESCR("bitmap of reserved ports"), 1985 sysctl_portalgo_reserve6, 0, NULL, 0, 1986 CTL_CREATE, CTL_EOL); 1987 sysctl_createv(clog, 0, NULL, NULL, 1988 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1989 CTLTYPE_INT, "neighborgcthresh", 1990 SYSCTL_DESCR("Maximum number of entries in neighbor" 1991 " cache"), 1992 NULL, 1, &ip6_neighborgcthresh, 0, 1993 CTL_NET, PF_INET6, IPPROTO_IPV6, 1994 CTL_CREATE, CTL_EOL); 1995 sysctl_createv(clog, 0, NULL, NULL, 1996 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1997 CTLTYPE_INT, "maxifprefixes", 1998 SYSCTL_DESCR("Maximum number of prefixes created by" 1999 " route advertisement per interface"), 2000 NULL, 1, &ip6_maxifprefixes, 0, 2001 CTL_NET, PF_INET6, IPPROTO_IPV6, 2002 CTL_CREATE, CTL_EOL); 2003 sysctl_createv(clog, 0, NULL, NULL, 2004 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2005 CTLTYPE_INT, "maxifdefrouters", 2006 SYSCTL_DESCR("Maximum number of default routers created" 2007 " by route advertisement per interface"), 2008 NULL, 1, &ip6_maxifdefrouters, 0, 2009 CTL_NET, PF_INET6, IPPROTO_IPV6, 2010 CTL_CREATE, CTL_EOL); 2011 sysctl_createv(clog, 0, NULL, NULL, 2012 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2013 CTLTYPE_INT, "maxdynroutes", 2014 SYSCTL_DESCR("Maximum number of routes created via" 2015 " redirect"), 2016 NULL, 1, &ip6_maxdynroutes, 0, 2017 CTL_NET, PF_INET6, IPPROTO_IPV6, 2018 CTL_CREATE, CTL_EOL); 2019 } 2020 2021 void 2022 ip6_statinc(u_int stat) 2023 { 2024 2025 KASSERT(stat < IP6_NSTATS); 2026 IP6_STATINC(stat); 2027 } 2028
Indexes created Mon Sep 22 05:09:51 GMT 2025