ip6_input.c revision 1.97
1 /* $NetBSD: ip6_input.c,v 1.97 2007/03/04 06:03:26 christos 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 1.97 2007/03/04 06:03:26 christos 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/in6_pcb.h> 106 #include <netinet/icmp6.h> 107 #include <netinet6/scope6_var.h> 108 #include <netinet6/in6_ifattach.h> 109 #include <netinet6/nd6.h> 110 111 #ifdef IPSEC 112 #include <netinet6/ipsec.h> 113 #endif 114 115 #ifdef FAST_IPSEC 116 #include <netipsec/ipsec.h> 117 #include <netipsec/ipsec6.h> 118 #include <netipsec/key.h> 119 #endif /* FAST_IPSEC */ 120 121 #include <netinet6/ip6protosw.h> 122 123 #include "faith.h" 124 #include "gif.h" 125 126 #if NGIF > 0 127 #include <netinet6/in6_gif.h> 128 #endif 129 130 #include <net/net_osdep.h> 131 132 extern struct domain inet6domain; 133 134 u_char ip6_protox[IPPROTO_MAX]; 135 static int ip6qmaxlen = IFQ_MAXLEN; 136 struct in6_ifaddr *in6_ifaddr; 137 struct ifqueue ip6intrq; 138 139 extern struct callout in6_tmpaddrtimer_ch; 140 141 int ip6_forward_srcrt; /* XXX */ 142 int ip6_sourcecheck; /* XXX */ 143 int ip6_sourcecheck_interval; /* XXX */ 144 145 #ifdef PFIL_HOOKS 146 struct pfil_head inet6_pfil_hook; 147 #endif 148 149 struct ip6stat ip6stat; 150 151 static void ip6_init2 __P((void *)); 152 static struct m_tag *ip6_setdstifaddr __P((struct mbuf *, struct in6_ifaddr *)); 153 154 static int ip6_hopopts_input __P((u_int32_t *, u_int32_t *, struct mbuf **, int *)); 155 static struct mbuf *ip6_pullexthdr __P((struct mbuf *, size_t, int)); 156 157 /* 158 * IP6 initialization: fill in IP6 protocol switch table. 159 * All protocols not implemented in kernel go to raw IP6 protocol handler. 160 */ 161 void 162 ip6_init() 163 { 164 const struct ip6protosw *pr; 165 int i; 166 167 pr = (const struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 168 if (pr == 0) 169 panic("ip6_init"); 170 for (i = 0; i < IPPROTO_MAX; i++) 171 ip6_protox[i] = pr - inet6sw; 172 for (pr = (const struct ip6protosw *)inet6domain.dom_protosw; 173 pr < (const struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++) 174 if (pr->pr_domain->dom_family == PF_INET6 && 175 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) 176 ip6_protox[pr->pr_protocol] = pr - inet6sw; 177 ip6intrq.ifq_maxlen = ip6qmaxlen; 178 scope6_init(); 179 addrsel_policy_init(); 180 nd6_init(); 181 frag6_init(); 182 ip6_desync_factor = arc4random() % MAX_TEMP_DESYNC_FACTOR; 183 184 ip6_init2((void *)0); 185 186 #ifdef PFIL_HOOKS 187 /* Register our Packet Filter hook. */ 188 inet6_pfil_hook.ph_type = PFIL_TYPE_AF; 189 inet6_pfil_hook.ph_af = AF_INET6; 190 i = pfil_head_register(&inet6_pfil_hook); 191 if (i != 0) 192 printf("ip6_init: WARNING: unable to register pfil hook, " 193 "error %d\n", i); 194 #endif /* PFIL_HOOKS */ 195 } 196 197 static void 198 ip6_init2(void *dummy) 199 { 200 201 /* nd6_timer_init */ 202 callout_init(&nd6_timer_ch); 203 callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL); 204 205 /* timer for regeneranation of temporary addresses randomize ID */ 206 callout_init(&in6_tmpaddrtimer_ch); 207 callout_reset(&in6_tmpaddrtimer_ch, 208 (ip6_temp_preferred_lifetime - ip6_desync_factor - 209 ip6_temp_regen_advance) * hz, 210 in6_tmpaddrtimer, NULL); 211 } 212 213 /* 214 * IP6 input interrupt handling. Just pass the packet to ip6_input. 215 */ 216 void 217 ip6intr() 218 { 219 int s; 220 struct mbuf *m; 221 222 for (;;) { 223 s = splnet(); 224 IF_DEQUEUE(&ip6intrq, m); 225 splx(s); 226 if (m == 0) 227 return; 228 /* drop the packet if IPv6 operation is disabled on the IF */ 229 if ((ND_IFINFO(m->m_pkthdr.rcvif)->flags & ND6_IFF_IFDISABLED)) { 230 m_freem(m); 231 return; 232 } 233 ip6_input(m); 234 } 235 } 236 237 extern struct route_in6 ip6_forward_rt; 238 239 void 240 ip6_input(struct mbuf *m) 241 { 242 struct ip6_hdr *ip6; 243 int off = sizeof(struct ip6_hdr), nest; 244 u_int32_t plen; 245 u_int32_t rtalert = ~0; 246 int nxt, ours = 0; 247 struct ifnet *deliverifp = NULL; 248 int srcrt = 0; 249 #ifdef FAST_IPSEC 250 struct m_tag *mtag; 251 struct tdb_ident *tdbi; 252 struct secpolicy *sp; 253 int s, error; 254 #endif 255 256 #ifdef IPSEC 257 /* 258 * should the inner packet be considered authentic? 259 * see comment in ah4_input(). 260 */ 261 m->m_flags &= ~M_AUTHIPHDR; 262 m->m_flags &= ~M_AUTHIPDGM; 263 #endif 264 265 /* 266 * make sure we don't have onion peering information into m_tag. 267 */ 268 ip6_delaux(m); 269 270 /* 271 * mbuf statistics 272 */ 273 if (m->m_flags & M_EXT) { 274 if (m->m_next) 275 ip6stat.ip6s_mext2m++; 276 else 277 ip6stat.ip6s_mext1++; 278 } else { 279 #define M2MMAX __arraycount(ip6stat.ip6s_m2m) 280 if (m->m_next) { 281 if (m->m_flags & M_LOOP) { 282 ip6stat.ip6s_m2m[lo0ifp->if_index]++; /* XXX */ 283 } else if (m->m_pkthdr.rcvif->if_index < M2MMAX) 284 ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++; 285 else 286 ip6stat.ip6s_m2m[0]++; 287 } else 288 ip6stat.ip6s_m1++; 289 #undef M2MMAX 290 } 291 292 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive); 293 ip6stat.ip6s_total++; 294 295 /* 296 * If the IPv6 header is not aligned, slurp it up into a new 297 * mbuf with space for link headers, in the event we forward 298 * it. Otherwise, if it is aligned, make sure the entire base 299 * IPv6 header is in the first mbuf of the chain. 300 */ 301 if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 302 struct ifnet *inifp = m->m_pkthdr.rcvif; 303 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 304 (max_linkhdr + 3) & ~3)) == NULL) { 305 /* XXXJRT new stat, please */ 306 ip6stat.ip6s_toosmall++; 307 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 308 return; 309 } 310 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 311 struct ifnet *inifp = m->m_pkthdr.rcvif; 312 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 313 ip6stat.ip6s_toosmall++; 314 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 315 return; 316 } 317 } 318 319 ip6 = mtod(m, struct ip6_hdr *); 320 321 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 322 ip6stat.ip6s_badvers++; 323 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 324 goto bad; 325 } 326 327 #ifdef PFIL_HOOKS 328 /* 329 * Run through list of hooks for input packets. If there are any 330 * filters which require that additional packets in the flow are 331 * not fast-forwarded, they must clear the M_CANFASTFWD flag. 332 * Note that filters must _never_ set this flag, as another filter 333 * in the list may have previously cleared it. 334 */ 335 /* 336 * let ipfilter look at packet on the wire, 337 * not the decapsulated packet. 338 */ 339 #ifdef IPSEC 340 if (!ipsec_getnhist(m)) 341 #elif defined(FAST_IPSEC) 342 if (!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 #endif /* PFIL_HOOKS */ 359 360 ip6stat.ip6s_nxthist[ip6->ip6_nxt]++; 361 362 #ifdef ALTQ 363 if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) { 364 /* packet is dropped by traffic conditioner */ 365 return; 366 } 367 #endif 368 369 /* 370 * Check against address spoofing/corruption. 371 */ 372 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) || 373 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) { 374 /* 375 * XXX: "badscope" is not very suitable for a multicast source. 376 */ 377 ip6stat.ip6s_badscope++; 378 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 379 goto bad; 380 } 381 /* 382 * The following check is not documented in specs. A malicious 383 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack 384 * and bypass security checks (act as if it was from 127.0.0.1 by using 385 * IPv6 src ::ffff:127.0.0.1). Be cautious. 386 * 387 * This check chokes if we are in an SIIT cloud. As none of BSDs 388 * support IPv4-less kernel compilation, we cannot support SIIT 389 * environment at all. So, it makes more sense for us to reject any 390 * malicious packets for non-SIIT environment, than try to do a 391 * partial support for SIIT environment. 392 */ 393 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 394 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 395 ip6stat.ip6s_badscope++; 396 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 397 goto bad; 398 } 399 #if 0 400 /* 401 * Reject packets with IPv4 compatible addresses (auto tunnel). 402 * 403 * The code forbids auto tunnel relay case in RFC1933 (the check is 404 * stronger than RFC1933). We may want to re-enable it if mech-xx 405 * is revised to forbid relaying case. 406 */ 407 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) || 408 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) { 409 ip6stat.ip6s_badscope++; 410 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 411 goto bad; 412 } 413 #endif 414 415 /* 416 * Disambiguate address scope zones (if there is ambiguity). 417 * We first make sure that the original source or destination address 418 * is not in our internal form for scoped addresses. Such addresses 419 * are not necessarily invalid spec-wise, but we cannot accept them due 420 * to the usage conflict. 421 * in6_setscope() then also checks and rejects the cases where src or 422 * dst are the loopback address and the receiving interface 423 * is not loopback. 424 */ 425 if (__predict_false( 426 m_makewritable(&m, 0, sizeof(struct ip6_hdr), M_DONTWAIT))) 427 goto bad; 428 ip6 = mtod(m, struct ip6_hdr *); 429 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) { 430 ip6stat.ip6s_badscope++; /* XXX */ 431 goto bad; 432 } 433 if (in6_setscope(&ip6->ip6_src, m->m_pkthdr.rcvif, NULL) || 434 in6_setscope(&ip6->ip6_dst, m->m_pkthdr.rcvif, NULL)) { 435 ip6stat.ip6s_badscope++; 436 goto bad; 437 } 438 439 /* 440 * Multicast check 441 */ 442 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 443 struct in6_multi *in6m = 0; 444 445 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast); 446 /* 447 * See if we belong to the destination multicast group on the 448 * arrival interface. 449 */ 450 IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m); 451 if (in6m) 452 ours = 1; 453 else if (!ip6_mrouter) { 454 ip6stat.ip6s_notmember++; 455 ip6stat.ip6s_cantforward++; 456 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 457 goto bad; 458 } 459 deliverifp = m->m_pkthdr.rcvif; 460 goto hbhcheck; 461 } 462 463 /* 464 * Unicast check 465 */ 466 if (!IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 467 &((const struct sockaddr_in6 *)rtcache_getdst((const struct route *)&ip6_forward_rt))->sin6_addr)) 468 rtcache_free((struct route *)&ip6_forward_rt); 469 else 470 rtcache_check((struct route *)&ip6_forward_rt); 471 if (ip6_forward_rt.ro_rt != NULL) { 472 /* XXX Revalidated route is accounted wrongly. */ 473 ip6stat.ip6s_forward_cachehit++; 474 } else { 475 struct sockaddr_in6 *dst6; 476 477 ip6stat.ip6s_forward_cachemiss++; 478 479 dst6 = &ip6_forward_rt.ro_dst; 480 memset(dst6, 0, sizeof(*dst6)); 481 dst6->sin6_len = sizeof(struct sockaddr_in6); 482 dst6->sin6_family = AF_INET6; 483 dst6->sin6_addr = ip6->ip6_dst; 484 485 rtcache_init((struct route *)&ip6_forward_rt); 486 } 487 488 #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key)) 489 490 /* 491 * Accept the packet if the forwarding interface to the destination 492 * according to the routing table is the loopback interface, 493 * unless the associated route has a gateway. 494 * Note that this approach causes to accept a packet if there is a 495 * route to the loopback interface for the destination of the packet. 496 * But we think it's even useful in some situations, e.g. when using 497 * a special daemon which wants to intercept the packet. 498 */ 499 if (ip6_forward_rt.ro_rt != NULL && 500 (ip6_forward_rt.ro_rt->rt_flags & 501 (RTF_HOST|RTF_GATEWAY)) == RTF_HOST && 502 !(ip6_forward_rt.ro_rt->rt_flags & RTF_CLONED) && 503 #if 0 504 /* 505 * The check below is redundant since the comparison of 506 * the destination and the key of the rtentry has 507 * already done through looking up the routing table. 508 */ 509 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 510 &rt6_key(ip6_forward_rt.ro_rt)->sin6_addr) && 511 #endif 512 ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) { 513 struct in6_ifaddr *ia6 = 514 (struct in6_ifaddr *)ip6_forward_rt.ro_rt->rt_ifa; 515 if (ia6->ia6_flags & IN6_IFF_ANYCAST) 516 m->m_flags |= M_ANYCAST6; 517 /* 518 * packets to a tentative, duplicated, or somehow invalid 519 * address must not be accepted. 520 */ 521 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) { 522 /* this address is ready */ 523 ours = 1; 524 deliverifp = ia6->ia_ifp; /* correct? */ 525 goto hbhcheck; 526 } else { 527 /* address is not ready, so discard the packet. */ 528 nd6log((LOG_INFO, 529 "ip6_input: packet to an unready address %s->%s\n", 530 ip6_sprintf(&ip6->ip6_src), 531 ip6_sprintf(&ip6->ip6_dst))); 532 533 goto bad; 534 } 535 } 536 537 /* 538 * FAITH (Firewall Aided Internet Translator) 539 */ 540 #if defined(NFAITH) && 0 < NFAITH 541 if (ip6_keepfaith) { 542 if (ip6_forward_rt.ro_rt != NULL && 543 ip6_forward_rt.ro_rt->rt_ifp != NULL && 544 ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) { 545 /* XXX do we need more sanity checks? */ 546 ours = 1; 547 deliverifp = ip6_forward_rt.ro_rt->rt_ifp; /* faith */ 548 goto hbhcheck; 549 } 550 } 551 #endif 552 553 #if 0 554 { 555 /* 556 * Last resort: check in6_ifaddr for incoming interface. 557 * The code is here until I update the "goto ours hack" code above 558 * working right. 559 */ 560 struct ifaddr *ifa; 561 TAILQ_FOREACH(ifa, &m->m_pkthdr.rcvif->if_addrlist, ifa_list) { 562 if (ifa->ifa_addr == NULL) 563 continue; /* just for safety */ 564 if (ifa->ifa_addr->sa_family != AF_INET6) 565 continue; 566 if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) { 567 ours = 1; 568 deliverifp = ifa->ifa_ifp; 569 goto hbhcheck; 570 } 571 } 572 } 573 #endif 574 575 /* 576 * Now there is no reason to process the packet if it's not our own 577 * and we're not a router. 578 */ 579 if (!ip6_forwarding) { 580 ip6stat.ip6s_cantforward++; 581 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 582 goto bad; 583 } 584 585 hbhcheck: 586 /* 587 * record address information into m_tag, if we don't have one yet. 588 * note that we are unable to record it, if the address is not listed 589 * as our interface address (e.g. multicast addresses, addresses 590 * within FAITH prefixes and such). 591 */ 592 if (deliverifp && !ip6_getdstifaddr(m)) { 593 struct in6_ifaddr *ia6; 594 595 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 596 if (ia6) { 597 if (!ip6_setdstifaddr(m, ia6)) { 598 /* 599 * XXX maybe we should drop the packet here, 600 * as we could not provide enough information 601 * to the upper layers. 602 */ 603 } 604 } 605 } 606 607 /* 608 * Process Hop-by-Hop options header if it's contained. 609 * m may be modified in ip6_hopopts_input(). 610 * If a JumboPayload option is included, plen will also be modified. 611 */ 612 plen = (u_int32_t)ntohs(ip6->ip6_plen); 613 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 614 struct ip6_hbh *hbh; 615 616 if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) { 617 #if 0 /*touches NULL pointer*/ 618 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 619 #endif 620 return; /* m have already been freed */ 621 } 622 623 /* adjust pointer */ 624 ip6 = mtod(m, struct ip6_hdr *); 625 626 /* 627 * if the payload length field is 0 and the next header field 628 * indicates Hop-by-Hop Options header, then a Jumbo Payload 629 * option MUST be included. 630 */ 631 if (ip6->ip6_plen == 0 && plen == 0) { 632 /* 633 * Note that if a valid jumbo payload option is 634 * contained, ip6_hopopts_input() must set a valid 635 * (non-zero) payload length to the variable plen. 636 */ 637 ip6stat.ip6s_badoptions++; 638 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 639 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 640 icmp6_error(m, ICMP6_PARAM_PROB, 641 ICMP6_PARAMPROB_HEADER, 642 (char *)&ip6->ip6_plen - (char *)ip6); 643 return; 644 } 645 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 646 sizeof(struct ip6_hbh)); 647 if (hbh == NULL) { 648 ip6stat.ip6s_tooshort++; 649 return; 650 } 651 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 652 nxt = hbh->ip6h_nxt; 653 654 /* 655 * accept the packet if a router alert option is included 656 * and we act as an IPv6 router. 657 */ 658 if (rtalert != ~0 && ip6_forwarding) 659 ours = 1; 660 } else 661 nxt = ip6->ip6_nxt; 662 663 /* 664 * Check that the amount of data in the buffers 665 * is as at least much as the IPv6 header would have us expect. 666 * Trim mbufs if longer than we expect. 667 * Drop packet if shorter than we expect. 668 */ 669 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 670 ip6stat.ip6s_tooshort++; 671 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 672 goto bad; 673 } 674 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 675 if (m->m_len == m->m_pkthdr.len) { 676 m->m_len = sizeof(struct ip6_hdr) + plen; 677 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 678 } else 679 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 680 } 681 682 /* 683 * Forward if desirable. 684 */ 685 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 686 /* 687 * If we are acting as a multicast router, all 688 * incoming multicast packets are passed to the 689 * kernel-level multicast forwarding function. 690 * The packet is returned (relatively) intact; if 691 * ip6_mforward() returns a non-zero value, the packet 692 * must be discarded, else it may be accepted below. 693 */ 694 if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) { 695 ip6stat.ip6s_cantforward++; 696 m_freem(m); 697 return; 698 } 699 if (!ours) { 700 m_freem(m); 701 return; 702 } 703 } else if (!ours) { 704 ip6_forward(m, srcrt); 705 return; 706 } 707 708 ip6 = mtod(m, struct ip6_hdr *); 709 710 /* 711 * Malicious party may be able to use IPv4 mapped addr to confuse 712 * tcp/udp stack and bypass security checks (act as if it was from 713 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious. 714 * 715 * For SIIT end node behavior, you may want to disable the check. 716 * However, you will become vulnerable to attacks using IPv4 mapped 717 * source. 718 */ 719 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 720 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 721 ip6stat.ip6s_badscope++; 722 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 723 goto bad; 724 } 725 726 /* 727 * Tell launch routine the next header 728 */ 729 #ifdef IFA_STATS 730 if (deliverifp != NULL) { 731 struct in6_ifaddr *ia6; 732 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 733 if (ia6) 734 ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len; 735 } 736 #endif 737 ip6stat.ip6s_delivered++; 738 in6_ifstat_inc(deliverifp, ifs6_in_deliver); 739 nest = 0; 740 741 while (nxt != IPPROTO_DONE) { 742 if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) { 743 ip6stat.ip6s_toomanyhdr++; 744 goto bad; 745 } 746 747 /* 748 * protection against faulty packet - there should be 749 * more sanity checks in header chain processing. 750 */ 751 if (m->m_pkthdr.len < off) { 752 ip6stat.ip6s_tooshort++; 753 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 754 goto bad; 755 } 756 757 #ifdef IPSEC 758 /* 759 * enforce IPsec policy checking if we are seeing last header. 760 * note that we do not visit this with protocols with pcb layer 761 * code - like udp/tcp/raw ip. 762 */ 763 if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 && 764 ipsec6_in_reject(m, NULL)) { 765 ipsec6stat.in_polvio++; 766 goto bad; 767 } 768 #endif 769 #ifdef FAST_IPSEC 770 /* 771 * enforce IPsec policy checking if we are seeing last header. 772 * note that we do not visit this with protocols with pcb layer 773 * code - like udp/tcp/raw ip. 774 */ 775 if ((inet6sw[ip_protox[nxt]].pr_flags & PR_LASTHDR) != 0) { 776 /* 777 * Check if the packet has already had IPsec processing 778 * done. If so, then just pass it along. This tag gets 779 * set during AH, ESP, etc. input handling, before the 780 * packet is returned to the ip input queue for delivery. 781 */ 782 mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL); 783 s = splsoftnet(); 784 if (mtag != NULL) { 785 tdbi = (struct tdb_ident *)(mtag + 1); 786 sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND); 787 } else { 788 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, 789 IP_FORWARDING, &error); 790 } 791 if (sp != NULL) { 792 /* 793 * Check security policy against packet attributes. 794 */ 795 error = ipsec_in_reject(sp, m); 796 KEY_FREESP(&sp); 797 } else { 798 /* XXX error stat??? */ 799 error = EINVAL; 800 DPRINTF(("ip6_input: no SP, packet discarded\n"));/*XXX*/ 801 goto bad; 802 } 803 splx(s); 804 if (error) 805 goto bad; 806 } 807 #endif /* FAST_IPSEC */ 808 809 810 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt); 811 } 812 return; 813 bad: 814 m_freem(m); 815 } 816 817 /* 818 * set/grab in6_ifaddr correspond to IPv6 destination address. 819 */ 820 static struct m_tag * 821 ip6_setdstifaddr(m, ia6) 822 struct mbuf *m; 823 struct in6_ifaddr *ia6; 824 { 825 struct m_tag *mtag; 826 827 mtag = ip6_addaux(m); 828 if (mtag) 829 ((struct ip6aux *)(mtag + 1))->ip6a_dstia6 = ia6; 830 return mtag; /* NULL if failed to set */ 831 } 832 833 struct in6_ifaddr * 834 ip6_getdstifaddr(m) 835 struct mbuf *m; 836 { 837 struct m_tag *mtag; 838 839 mtag = ip6_findaux(m); 840 if (mtag) 841 return ((struct ip6aux *)(mtag + 1))->ip6a_dstia6; 842 else 843 return NULL; 844 } 845 846 /* 847 * Hop-by-Hop options header processing. If a valid jumbo payload option is 848 * included, the real payload length will be stored in plenp. 849 */ 850 static int 851 ip6_hopopts_input(plenp, rtalertp, mp, offp) 852 u_int32_t *plenp; 853 u_int32_t *rtalertp; /* XXX: should be stored more smart way */ 854 struct mbuf **mp; 855 int *offp; 856 { 857 struct mbuf *m = *mp; 858 int off = *offp, hbhlen; 859 struct ip6_hbh *hbh; 860 861 /* validation of the length of the header */ 862 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, 863 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh)); 864 if (hbh == NULL) { 865 ip6stat.ip6s_tooshort++; 866 return -1; 867 } 868 hbhlen = (hbh->ip6h_len + 1) << 3; 869 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 870 hbhlen); 871 if (hbh == NULL) { 872 ip6stat.ip6s_tooshort++; 873 return -1; 874 } 875 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 876 off += hbhlen; 877 hbhlen -= sizeof(struct ip6_hbh); 878 879 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 880 hbhlen, rtalertp, plenp) < 0) 881 return (-1); 882 883 *offp = off; 884 *mp = m; 885 return (0); 886 } 887 888 /* 889 * Search header for all Hop-by-hop options and process each option. 890 * This function is separate from ip6_hopopts_input() in order to 891 * handle a case where the sending node itself process its hop-by-hop 892 * options header. In such a case, the function is called from ip6_output(). 893 * 894 * The function assumes that hbh header is located right after the IPv6 header 895 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to 896 * opthead + hbhlen is located in continuous memory region. 897 */ 898 int 899 ip6_process_hopopts(m, opthead, hbhlen, rtalertp, plenp) 900 struct mbuf *m; 901 u_int8_t *opthead; 902 int hbhlen; 903 u_int32_t *rtalertp; 904 u_int32_t *plenp; 905 { 906 struct ip6_hdr *ip6; 907 int optlen = 0; 908 u_int8_t *opt = opthead; 909 u_int16_t rtalert_val; 910 u_int32_t jumboplen; 911 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh); 912 913 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 914 switch (*opt) { 915 case IP6OPT_PAD1: 916 optlen = 1; 917 break; 918 case IP6OPT_PADN: 919 if (hbhlen < IP6OPT_MINLEN) { 920 ip6stat.ip6s_toosmall++; 921 goto bad; 922 } 923 optlen = *(opt + 1) + 2; 924 break; 925 case IP6OPT_RTALERT: 926 /* XXX may need check for alignment */ 927 if (hbhlen < IP6OPT_RTALERT_LEN) { 928 ip6stat.ip6s_toosmall++; 929 goto bad; 930 } 931 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) { 932 /* XXX stat */ 933 icmp6_error(m, ICMP6_PARAM_PROB, 934 ICMP6_PARAMPROB_HEADER, 935 erroff + opt + 1 - opthead); 936 return (-1); 937 } 938 optlen = IP6OPT_RTALERT_LEN; 939 bcopy((void *)(opt + 2), (void *)&rtalert_val, 2); 940 *rtalertp = ntohs(rtalert_val); 941 break; 942 case IP6OPT_JUMBO: 943 /* XXX may need check for alignment */ 944 if (hbhlen < IP6OPT_JUMBO_LEN) { 945 ip6stat.ip6s_toosmall++; 946 goto bad; 947 } 948 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) { 949 /* XXX stat */ 950 icmp6_error(m, ICMP6_PARAM_PROB, 951 ICMP6_PARAMPROB_HEADER, 952 erroff + opt + 1 - opthead); 953 return (-1); 954 } 955 optlen = IP6OPT_JUMBO_LEN; 956 957 /* 958 * IPv6 packets that have non 0 payload length 959 * must not contain a jumbo payload option. 960 */ 961 ip6 = mtod(m, struct ip6_hdr *); 962 if (ip6->ip6_plen) { 963 ip6stat.ip6s_badoptions++; 964 icmp6_error(m, ICMP6_PARAM_PROB, 965 ICMP6_PARAMPROB_HEADER, 966 erroff + opt - opthead); 967 return (-1); 968 } 969 970 /* 971 * We may see jumbolen in unaligned location, so 972 * we'd need to perform bcopy(). 973 */ 974 bcopy(opt + 2, &jumboplen, sizeof(jumboplen)); 975 jumboplen = (u_int32_t)htonl(jumboplen); 976 977 #if 1 978 /* 979 * if there are multiple jumbo payload options, 980 * *plenp will be non-zero and the packet will be 981 * rejected. 982 * the behavior may need some debate in ipngwg - 983 * multiple options does not make sense, however, 984 * there's no explicit mention in specification. 985 */ 986 if (*plenp != 0) { 987 ip6stat.ip6s_badoptions++; 988 icmp6_error(m, ICMP6_PARAM_PROB, 989 ICMP6_PARAMPROB_HEADER, 990 erroff + opt + 2 - opthead); 991 return (-1); 992 } 993 #endif 994 995 /* 996 * jumbo payload length must be larger than 65535. 997 */ 998 if (jumboplen <= IPV6_MAXPACKET) { 999 ip6stat.ip6s_badoptions++; 1000 icmp6_error(m, ICMP6_PARAM_PROB, 1001 ICMP6_PARAMPROB_HEADER, 1002 erroff + opt + 2 - opthead); 1003 return (-1); 1004 } 1005 *plenp = jumboplen; 1006 1007 break; 1008 default: /* unknown option */ 1009 if (hbhlen < IP6OPT_MINLEN) { 1010 ip6stat.ip6s_toosmall++; 1011 goto bad; 1012 } 1013 optlen = ip6_unknown_opt(opt, m, 1014 erroff + opt - opthead); 1015 if (optlen == -1) 1016 return (-1); 1017 optlen += 2; 1018 break; 1019 } 1020 } 1021 1022 return (0); 1023 1024 bad: 1025 m_freem(m); 1026 return (-1); 1027 } 1028 1029 /* 1030 * Unknown option processing. 1031 * The third argument `off' is the offset from the IPv6 header to the option, 1032 * which is necessary if the IPv6 header the and option header and IPv6 header 1033 * is not continuous in order to return an ICMPv6 error. 1034 */ 1035 int 1036 ip6_unknown_opt(optp, m, off) 1037 u_int8_t *optp; 1038 struct mbuf *m; 1039 int off; 1040 { 1041 struct ip6_hdr *ip6; 1042 1043 switch (IP6OPT_TYPE(*optp)) { 1044 case IP6OPT_TYPE_SKIP: /* ignore the option */ 1045 return ((int)*(optp + 1)); 1046 case IP6OPT_TYPE_DISCARD: /* silently discard */ 1047 m_freem(m); 1048 return (-1); 1049 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 1050 ip6stat.ip6s_badoptions++; 1051 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 1052 return (-1); 1053 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 1054 ip6stat.ip6s_badoptions++; 1055 ip6 = mtod(m, struct ip6_hdr *); 1056 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 1057 (m->m_flags & (M_BCAST|M_MCAST))) 1058 m_freem(m); 1059 else 1060 icmp6_error(m, ICMP6_PARAM_PROB, 1061 ICMP6_PARAMPROB_OPTION, off); 1062 return (-1); 1063 } 1064 1065 m_freem(m); /* XXX: NOTREACHED */ 1066 return (-1); 1067 } 1068 1069 /* 1070 * Create the "control" list for this pcb. 1071 * 1072 * The routine will be called from upper layer handlers like tcp6_input(). 1073 * Thus the routine assumes that the caller (tcp6_input) have already 1074 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the 1075 * very first mbuf on the mbuf chain. 1076 * We may want to add some infinite loop prevention or sanity checks for safety. 1077 * (This applies only when you are using KAME mbuf chain restriction, i.e. 1078 * you are using IP6_EXTHDR_CHECK() not m_pulldown()) 1079 */ 1080 void 1081 ip6_savecontrol(in6p, mp, ip6, m) 1082 struct in6pcb *in6p; 1083 struct mbuf **mp; 1084 struct ip6_hdr *ip6; 1085 struct mbuf *m; 1086 { 1087 #ifdef RFC2292 1088 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y)) 1089 #else 1090 #define IS2292(x, y) (y) 1091 #endif 1092 1093 #ifdef SO_TIMESTAMP 1094 if (in6p->in6p_socket->so_options & SO_TIMESTAMP) { 1095 struct timeval tv; 1096 1097 microtime(&tv); 1098 *mp = sbcreatecontrol((void *) &tv, sizeof(tv), 1099 SCM_TIMESTAMP, SOL_SOCKET); 1100 if (*mp) 1101 mp = &(*mp)->m_next; 1102 } 1103 #endif 1104 1105 /* some OSes call this logic with IPv4 packet, for SO_TIMESTAMP */ 1106 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) 1107 return; 1108 1109 /* RFC 2292 sec. 5 */ 1110 if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) { 1111 struct in6_pktinfo pi6; 1112 1113 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr)); 1114 in6_clearscope(&pi6.ipi6_addr); /* XXX */ 1115 pi6.ipi6_ifindex = m->m_pkthdr.rcvif ? 1116 m->m_pkthdr.rcvif->if_index : 0; 1117 *mp = sbcreatecontrol((void *) &pi6, 1118 sizeof(struct in6_pktinfo), 1119 IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6); 1120 if (*mp) 1121 mp = &(*mp)->m_next; 1122 } 1123 1124 if (in6p->in6p_flags & IN6P_HOPLIMIT) { 1125 int hlim = ip6->ip6_hlim & 0xff; 1126 1127 *mp = sbcreatecontrol((void *) &hlim, sizeof(int), 1128 IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6); 1129 if (*mp) 1130 mp = &(*mp)->m_next; 1131 } 1132 1133 if ((in6p->in6p_flags & IN6P_TCLASS) != 0) { 1134 u_int32_t flowinfo; 1135 int tclass; 1136 1137 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK); 1138 flowinfo >>= 20; 1139 1140 tclass = flowinfo & 0xff; 1141 *mp = sbcreatecontrol((void *)&tclass, sizeof(tclass), 1142 IPV6_TCLASS, IPPROTO_IPV6); 1143 1144 if (*mp) 1145 mp = &(*mp)->m_next; 1146 } 1147 1148 /* 1149 * IPV6_HOPOPTS socket option. Recall that we required super-user 1150 * privilege for the option (see ip6_ctloutput), but it might be too 1151 * strict, since there might be some hop-by-hop options which can be 1152 * returned to normal user. 1153 * See also RFC3542 section 8 (or RFC2292 section 6). 1154 */ 1155 if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0) { 1156 /* 1157 * Check if a hop-by-hop options header is contatined in the 1158 * received packet, and if so, store the options as ancillary 1159 * data. Note that a hop-by-hop options header must be 1160 * just after the IPv6 header, which fact is assured through 1161 * the IPv6 input processing. 1162 */ 1163 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1164 if (xip6->ip6_nxt == IPPROTO_HOPOPTS) { 1165 struct ip6_hbh *hbh; 1166 int hbhlen; 1167 struct mbuf *ext; 1168 1169 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr), 1170 xip6->ip6_nxt); 1171 if (ext == NULL) { 1172 ip6stat.ip6s_tooshort++; 1173 return; 1174 } 1175 hbh = mtod(ext, struct ip6_hbh *); 1176 hbhlen = (hbh->ip6h_len + 1) << 3; 1177 if (hbhlen != ext->m_len) { 1178 m_freem(ext); 1179 ip6stat.ip6s_tooshort++; 1180 return; 1181 } 1182 1183 /* 1184 * XXX: We copy whole the header even if a jumbo 1185 * payload option is included, which option is to 1186 * be removed before returning in the RFC 2292. 1187 * Note: this constraint is removed in RFC3542. 1188 */ 1189 *mp = sbcreatecontrol((void *)hbh, hbhlen, 1190 IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS), 1191 IPPROTO_IPV6); 1192 if (*mp) 1193 mp = &(*mp)->m_next; 1194 m_freem(ext); 1195 } 1196 } 1197 1198 /* IPV6_DSTOPTS and IPV6_RTHDR socket options */ 1199 if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) { 1200 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1201 int nxt = xip6->ip6_nxt, off = sizeof(struct ip6_hdr); 1202 1203 /* 1204 * Search for destination options headers or routing 1205 * header(s) through the header chain, and stores each 1206 * header as ancillary data. 1207 * Note that the order of the headers remains in 1208 * the chain of ancillary data. 1209 */ 1210 for (;;) { /* is explicit loop prevention necessary? */ 1211 struct ip6_ext *ip6e = NULL; 1212 int elen; 1213 struct mbuf *ext = NULL; 1214 1215 /* 1216 * if it is not an extension header, don't try to 1217 * pull it from the chain. 1218 */ 1219 switch (nxt) { 1220 case IPPROTO_DSTOPTS: 1221 case IPPROTO_ROUTING: 1222 case IPPROTO_HOPOPTS: 1223 case IPPROTO_AH: /* is it possible? */ 1224 break; 1225 default: 1226 goto loopend; 1227 } 1228 1229 ext = ip6_pullexthdr(m, off, nxt); 1230 if (ext == NULL) { 1231 ip6stat.ip6s_tooshort++; 1232 return; 1233 } 1234 ip6e = mtod(ext, struct ip6_ext *); 1235 if (nxt == IPPROTO_AH) 1236 elen = (ip6e->ip6e_len + 2) << 2; 1237 else 1238 elen = (ip6e->ip6e_len + 1) << 3; 1239 if (elen != ext->m_len) { 1240 m_freem(ext); 1241 ip6stat.ip6s_tooshort++; 1242 return; 1243 } 1244 KASSERT(IP6_HDR_ALIGNED_P(ip6e)); 1245 1246 switch (nxt) { 1247 case IPPROTO_DSTOPTS: 1248 if (!in6p->in6p_flags & IN6P_DSTOPTS) 1249 break; 1250 1251 *mp = sbcreatecontrol((void *)ip6e, elen, 1252 IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS), 1253 IPPROTO_IPV6); 1254 if (*mp) 1255 mp = &(*mp)->m_next; 1256 break; 1257 1258 case IPPROTO_ROUTING: 1259 if (!in6p->in6p_flags & IN6P_RTHDR) 1260 break; 1261 1262 *mp = sbcreatecontrol((void *)ip6e, elen, 1263 IS2292(IPV6_2292RTHDR, IPV6_RTHDR), 1264 IPPROTO_IPV6); 1265 if (*mp) 1266 mp = &(*mp)->m_next; 1267 break; 1268 1269 case IPPROTO_HOPOPTS: 1270 case IPPROTO_AH: /* is it possible? */ 1271 break; 1272 1273 default: 1274 /* 1275 * other cases have been filtered in the above. 1276 * none will visit this case. here we supply 1277 * the code just in case (nxt overwritten or 1278 * other cases). 1279 */ 1280 m_freem(ext); 1281 goto loopend; 1282 1283 } 1284 1285 /* proceed with the next header. */ 1286 off += elen; 1287 nxt = ip6e->ip6e_nxt; 1288 ip6e = NULL; 1289 m_freem(ext); 1290 ext = NULL; 1291 } 1292 loopend: 1293 ; 1294 } 1295 } 1296 #undef IS2292 1297 1298 1299 void 1300 ip6_notify_pmtu(struct in6pcb *in6p, const struct sockaddr_in6 *dst, 1301 uint32_t *mtu) 1302 { 1303 struct socket *so; 1304 struct mbuf *m_mtu; 1305 struct ip6_mtuinfo mtuctl; 1306 1307 so = in6p->in6p_socket; 1308 1309 if (mtu == NULL) 1310 return; 1311 1312 #ifdef DIAGNOSTIC 1313 if (so == NULL) /* I believe this is impossible */ 1314 panic("ip6_notify_pmtu: socket is NULL"); 1315 #endif 1316 1317 memset(&mtuctl, 0, sizeof(mtuctl)); /* zero-clear for safety */ 1318 mtuctl.ip6m_mtu = *mtu; 1319 mtuctl.ip6m_addr = *dst; 1320 if (sa6_recoverscope(&mtuctl.ip6m_addr)) 1321 return; 1322 1323 if ((m_mtu = sbcreatecontrol((void *)&mtuctl, sizeof(mtuctl), 1324 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL) 1325 return; 1326 1327 if (sbappendaddr(&so->so_rcv, (const struct sockaddr *)dst, NULL, m_mtu) 1328 == 0) { 1329 m_freem(m_mtu); 1330 /* XXX: should count statistics */ 1331 } else 1332 sorwakeup(so); 1333 1334 return; 1335 } 1336 1337 /* 1338 * pull single extension header from mbuf chain. returns single mbuf that 1339 * contains the result, or NULL on error. 1340 */ 1341 static struct mbuf * 1342 ip6_pullexthdr(m, off, nxt) 1343 struct mbuf *m; 1344 size_t off; 1345 int nxt; 1346 { 1347 struct ip6_ext ip6e; 1348 size_t elen; 1349 struct mbuf *n; 1350 1351 #ifdef DIAGNOSTIC 1352 switch (nxt) { 1353 case IPPROTO_DSTOPTS: 1354 case IPPROTO_ROUTING: 1355 case IPPROTO_HOPOPTS: 1356 case IPPROTO_AH: /* is it possible? */ 1357 break; 1358 default: 1359 printf("ip6_pullexthdr: invalid nxt=%d\n", nxt); 1360 } 1361 #endif 1362 1363 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1364 if (nxt == IPPROTO_AH) 1365 elen = (ip6e.ip6e_len + 2) << 2; 1366 else 1367 elen = (ip6e.ip6e_len + 1) << 3; 1368 1369 MGET(n, M_DONTWAIT, MT_DATA); 1370 if (n && elen >= MLEN) { 1371 MCLGET(n, M_DONTWAIT); 1372 if ((n->m_flags & M_EXT) == 0) { 1373 m_free(n); 1374 n = NULL; 1375 } 1376 } 1377 if (!n) 1378 return NULL; 1379 1380 n->m_len = 0; 1381 if (elen >= M_TRAILINGSPACE(n)) { 1382 m_free(n); 1383 return NULL; 1384 } 1385 1386 m_copydata(m, off, elen, mtod(n, void *)); 1387 n->m_len = elen; 1388 return n; 1389 } 1390 1391 /* 1392 * Get pointer to the previous header followed by the header 1393 * currently processed. 1394 * XXX: This function supposes that 1395 * M includes all headers, 1396 * the next header field and the header length field of each header 1397 * are valid, and 1398 * the sum of each header length equals to OFF. 1399 * Because of these assumptions, this function must be called very 1400 * carefully. Moreover, it will not be used in the near future when 1401 * we develop `neater' mechanism to process extension headers. 1402 */ 1403 u_int8_t * 1404 ip6_get_prevhdr(m, off) 1405 struct mbuf *m; 1406 int off; 1407 { 1408 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1409 1410 if (off == sizeof(struct ip6_hdr)) 1411 return (&ip6->ip6_nxt); 1412 else { 1413 int len, nxt; 1414 struct ip6_ext *ip6e = NULL; 1415 1416 nxt = ip6->ip6_nxt; 1417 len = sizeof(struct ip6_hdr); 1418 while (len < off) { 1419 ip6e = (struct ip6_ext *)(mtod(m, char *) + len); 1420 1421 switch (nxt) { 1422 case IPPROTO_FRAGMENT: 1423 len += sizeof(struct ip6_frag); 1424 break; 1425 case IPPROTO_AH: 1426 len += (ip6e->ip6e_len + 2) << 2; 1427 break; 1428 default: 1429 len += (ip6e->ip6e_len + 1) << 3; 1430 break; 1431 } 1432 nxt = ip6e->ip6e_nxt; 1433 } 1434 if (ip6e) 1435 return (&ip6e->ip6e_nxt); 1436 else 1437 return NULL; 1438 } 1439 } 1440 1441 /* 1442 * get next header offset. m will be retained. 1443 */ 1444 int 1445 ip6_nexthdr(m, off, proto, nxtp) 1446 struct mbuf *m; 1447 int off; 1448 int proto; 1449 int *nxtp; 1450 { 1451 struct ip6_hdr ip6; 1452 struct ip6_ext ip6e; 1453 struct ip6_frag fh; 1454 1455 /* just in case */ 1456 if (m == NULL) 1457 panic("ip6_nexthdr: m == NULL"); 1458 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off) 1459 return -1; 1460 1461 switch (proto) { 1462 case IPPROTO_IPV6: 1463 /* do not chase beyond intermediate IPv6 headers */ 1464 if (off != 0) 1465 return -1; 1466 if (m->m_pkthdr.len < off + sizeof(ip6)) 1467 return -1; 1468 m_copydata(m, off, sizeof(ip6), (void *)&ip6); 1469 if (nxtp) 1470 *nxtp = ip6.ip6_nxt; 1471 off += sizeof(ip6); 1472 return off; 1473 1474 case IPPROTO_FRAGMENT: 1475 /* 1476 * terminate parsing if it is not the first fragment, 1477 * it does not make sense to parse through it. 1478 */ 1479 if (m->m_pkthdr.len < off + sizeof(fh)) 1480 return -1; 1481 m_copydata(m, off, sizeof(fh), (void *)&fh); 1482 if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0) 1483 return -1; 1484 if (nxtp) 1485 *nxtp = fh.ip6f_nxt; 1486 off += sizeof(struct ip6_frag); 1487 return off; 1488 1489 case IPPROTO_AH: 1490 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1491 return -1; 1492 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1493 if (nxtp) 1494 *nxtp = ip6e.ip6e_nxt; 1495 off += (ip6e.ip6e_len + 2) << 2; 1496 if (m->m_pkthdr.len < off) 1497 return -1; 1498 return off; 1499 1500 case IPPROTO_HOPOPTS: 1501 case IPPROTO_ROUTING: 1502 case IPPROTO_DSTOPTS: 1503 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1504 return -1; 1505 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1506 if (nxtp) 1507 *nxtp = ip6e.ip6e_nxt; 1508 off += (ip6e.ip6e_len + 1) << 3; 1509 if (m->m_pkthdr.len < off) 1510 return -1; 1511 return off; 1512 1513 case IPPROTO_NONE: 1514 case IPPROTO_ESP: 1515 case IPPROTO_IPCOMP: 1516 /* give up */ 1517 return -1; 1518 1519 default: 1520 return -1; 1521 } 1522 } 1523 1524 /* 1525 * get offset for the last header in the chain. m will be kept untainted. 1526 */ 1527 int 1528 ip6_lasthdr(m, off, proto, nxtp) 1529 struct mbuf *m; 1530 int off; 1531 int proto; 1532 int *nxtp; 1533 { 1534 int newoff; 1535 int nxt; 1536 1537 if (!nxtp) { 1538 nxt = -1; 1539 nxtp = &nxt; 1540 } 1541 for (;;) { 1542 newoff = ip6_nexthdr(m, off, proto, nxtp); 1543 if (newoff < 0) 1544 return off; 1545 else if (newoff < off) 1546 return -1; /* invalid */ 1547 else if (newoff == off) 1548 return newoff; 1549 1550 off = newoff; 1551 proto = *nxtp; 1552 } 1553 } 1554 1555 struct m_tag * 1556 ip6_addaux(m) 1557 struct mbuf *m; 1558 { 1559 struct m_tag *mtag; 1560 1561 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1562 if (!mtag) { 1563 mtag = m_tag_get(PACKET_TAG_INET6, sizeof(struct ip6aux), 1564 M_NOWAIT); 1565 if (mtag) { 1566 m_tag_prepend(m, mtag); 1567 bzero(mtag + 1, sizeof(struct ip6aux)); 1568 } 1569 } 1570 return mtag; 1571 } 1572 1573 struct m_tag * 1574 ip6_findaux(m) 1575 struct mbuf *m; 1576 { 1577 struct m_tag *mtag; 1578 1579 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1580 return mtag; 1581 } 1582 1583 void 1584 ip6_delaux(m) 1585 struct mbuf *m; 1586 { 1587 struct m_tag *mtag; 1588 1589 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1590 if (mtag) 1591 m_tag_delete(m, mtag); 1592 } 1593 1594 /* 1595 * System control for IP6 1596 */ 1597 1598 u_char inet6ctlerrmap[PRC_NCMDS] = { 1599 0, 0, 0, 0, 1600 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 1601 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 1602 EMSGSIZE, EHOSTUNREACH, 0, 0, 1603 0, 0, 0, 0, 1604 ENOPROTOOPT 1605 }; 1606 1607 SYSCTL_SETUP(sysctl_net_inet6_ip6_setup, "sysctl net.inet6.ip6 subtree setup") 1608 { 1609 #ifdef RFC2292 1610 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y)) 1611 #else 1612 #define IS2292(x, y) (y) 1613 #endif 1614 1615 sysctl_createv(clog, 0, NULL, NULL, 1616 CTLFLAG_PERMANENT, 1617 CTLTYPE_NODE, "net", NULL, 1618 NULL, 0, NULL, 0, 1619 CTL_NET, CTL_EOL); 1620 sysctl_createv(clog, 0, NULL, NULL, 1621 CTLFLAG_PERMANENT, 1622 CTLTYPE_NODE, "inet6", 1623 SYSCTL_DESCR("PF_INET6 related settings"), 1624 NULL, 0, NULL, 0, 1625 CTL_NET, PF_INET6, CTL_EOL); 1626 sysctl_createv(clog, 0, NULL, NULL, 1627 CTLFLAG_PERMANENT, 1628 CTLTYPE_NODE, "ip6", 1629 SYSCTL_DESCR("IPv6 related settings"), 1630 NULL, 0, NULL, 0, 1631 CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_EOL); 1632 1633 sysctl_createv(clog, 0, NULL, NULL, 1634 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1635 CTLTYPE_INT, "forwarding", 1636 SYSCTL_DESCR("Enable forwarding of INET6 datagrams"), 1637 NULL, 0, &ip6_forwarding, 0, 1638 CTL_NET, PF_INET6, IPPROTO_IPV6, 1639 IPV6CTL_FORWARDING, CTL_EOL); 1640 sysctl_createv(clog, 0, NULL, NULL, 1641 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1642 CTLTYPE_INT, "redirect", 1643 SYSCTL_DESCR("Enable sending of ICMPv6 redirect messages"), 1644 NULL, 0, &ip6_sendredirects, 0, 1645 CTL_NET, PF_INET6, IPPROTO_IPV6, 1646 IPV6CTL_SENDREDIRECTS, CTL_EOL); 1647 sysctl_createv(clog, 0, NULL, NULL, 1648 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1649 CTLTYPE_INT, "hlim", 1650 SYSCTL_DESCR("Hop limit for an INET6 datagram"), 1651 NULL, 0, &ip6_defhlim, 0, 1652 CTL_NET, PF_INET6, IPPROTO_IPV6, 1653 IPV6CTL_DEFHLIM, CTL_EOL); 1654 #ifdef notyet 1655 sysctl_createv(clog, 0, NULL, NULL, 1656 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1657 CTLTYPE_INT, "mtu", NULL, 1658 NULL, 0, &, 0, 1659 CTL_NET, PF_INET6, IPPROTO_IPV6, 1660 IPV6CTL_DEFMTU, CTL_EOL); 1661 #endif 1662 #ifdef __no_idea__ 1663 sysctl_createv(clog, 0, NULL, NULL, 1664 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1665 CTLTYPE_INT, "forwsrcrt", NULL, 1666 NULL, 0, &?, 0, 1667 CTL_NET, PF_INET6, IPPROTO_IPV6, 1668 IPV6CTL_FORWSRCRT, CTL_EOL); 1669 sysctl_createv(clog, 0, NULL, NULL, 1670 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1671 CTLTYPE_STRUCT, "mrtstats", NULL, 1672 NULL, 0, &?, sizeof(?), 1673 CTL_NET, PF_INET6, IPPROTO_IPV6, 1674 IPV6CTL_MRTSTATS, CTL_EOL); 1675 sysctl_createv(clog, 0, NULL, NULL, 1676 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1677 CTLTYPE_?, "mrtproto", NULL, 1678 NULL, 0, &?, sizeof(?), 1679 CTL_NET, PF_INET6, IPPROTO_IPV6, 1680 IPV6CTL_MRTPROTO, CTL_EOL); 1681 #endif 1682 sysctl_createv(clog, 0, NULL, NULL, 1683 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1684 CTLTYPE_INT, "maxfragpackets", 1685 SYSCTL_DESCR("Maximum number of fragments to buffer " 1686 "for reassembly"), 1687 NULL, 0, &ip6_maxfragpackets, 0, 1688 CTL_NET, PF_INET6, IPPROTO_IPV6, 1689 IPV6CTL_MAXFRAGPACKETS, CTL_EOL); 1690 #ifdef __no_idea__ 1691 sysctl_createv(clog, 0, NULL, NULL, 1692 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1693 CTLTYPE_INT, "sourcecheck", NULL, 1694 NULL, 0, &?, 0, 1695 CTL_NET, PF_INET6, IPPROTO_IPV6, 1696 IPV6CTL_SOURCECHECK, CTL_EOL); 1697 sysctl_createv(clog, 0, NULL, NULL, 1698 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1699 CTLTYPE_INT, "sourcecheck_logint", NULL, 1700 NULL, 0, &?, 0, 1701 CTL_NET, PF_INET6, IPPROTO_IPV6, 1702 IPV6CTL_SOURCECHECK_LOGINT, CTL_EOL); 1703 #endif 1704 sysctl_createv(clog, 0, NULL, NULL, 1705 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1706 CTLTYPE_INT, "accept_rtadv", 1707 SYSCTL_DESCR("Accept router advertisements"), 1708 NULL, 0, &ip6_accept_rtadv, 0, 1709 CTL_NET, PF_INET6, IPPROTO_IPV6, 1710 IPV6CTL_ACCEPT_RTADV, CTL_EOL); 1711 sysctl_createv(clog, 0, NULL, NULL, 1712 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1713 CTLTYPE_INT, "keepfaith", 1714 SYSCTL_DESCR("Activate faith interface"), 1715 NULL, 0, &ip6_keepfaith, 0, 1716 CTL_NET, PF_INET6, IPPROTO_IPV6, 1717 IPV6CTL_KEEPFAITH, CTL_EOL); 1718 sysctl_createv(clog, 0, NULL, NULL, 1719 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1720 CTLTYPE_INT, "log_interval", 1721 SYSCTL_DESCR("Minumum interval between logging " 1722 "unroutable packets"), 1723 NULL, 0, &ip6_log_interval, 0, 1724 CTL_NET, PF_INET6, IPPROTO_IPV6, 1725 IPV6CTL_LOG_INTERVAL, CTL_EOL); 1726 sysctl_createv(clog, 0, NULL, NULL, 1727 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1728 CTLTYPE_INT, "hdrnestlimit", 1729 SYSCTL_DESCR("Maximum number of nested IPv6 headers"), 1730 NULL, 0, &ip6_hdrnestlimit, 0, 1731 CTL_NET, PF_INET6, IPPROTO_IPV6, 1732 IPV6CTL_HDRNESTLIMIT, CTL_EOL); 1733 sysctl_createv(clog, 0, NULL, NULL, 1734 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1735 CTLTYPE_INT, "dad_count", 1736 SYSCTL_DESCR("Number of Duplicate Address Detection " 1737 "probes to send"), 1738 NULL, 0, &ip6_dad_count, 0, 1739 CTL_NET, PF_INET6, IPPROTO_IPV6, 1740 IPV6CTL_DAD_COUNT, CTL_EOL); 1741 sysctl_createv(clog, 0, NULL, NULL, 1742 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1743 CTLTYPE_INT, "auto_flowlabel", 1744 SYSCTL_DESCR("Assign random IPv6 flow labels"), 1745 NULL, 0, &ip6_auto_flowlabel, 0, 1746 CTL_NET, PF_INET6, IPPROTO_IPV6, 1747 IPV6CTL_AUTO_FLOWLABEL, CTL_EOL); 1748 sysctl_createv(clog, 0, NULL, NULL, 1749 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1750 CTLTYPE_INT, "defmcasthlim", 1751 SYSCTL_DESCR("Default multicast hop limit"), 1752 NULL, 0, &ip6_defmcasthlim, 0, 1753 CTL_NET, PF_INET6, IPPROTO_IPV6, 1754 IPV6CTL_DEFMCASTHLIM, CTL_EOL); 1755 #if NGIF > 0 1756 sysctl_createv(clog, 0, NULL, NULL, 1757 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1758 CTLTYPE_INT, "gifhlim", 1759 SYSCTL_DESCR("Default hop limit for a gif tunnel datagram"), 1760 NULL, 0, &ip6_gif_hlim, 0, 1761 CTL_NET, PF_INET6, IPPROTO_IPV6, 1762 IPV6CTL_GIF_HLIM, CTL_EOL); 1763 #endif /* NGIF */ 1764 sysctl_createv(clog, 0, NULL, NULL, 1765 CTLFLAG_PERMANENT, 1766 CTLTYPE_STRING, "kame_version", 1767 SYSCTL_DESCR("KAME Version"), 1768 NULL, 0, __UNCONST(__KAME_VERSION), 0, 1769 CTL_NET, PF_INET6, IPPROTO_IPV6, 1770 IPV6CTL_KAME_VERSION, CTL_EOL); 1771 sysctl_createv(clog, 0, NULL, NULL, 1772 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1773 CTLTYPE_INT, "use_deprecated", 1774 SYSCTL_DESCR("Allow use of deprecated addresses as " 1775 "source addresses"), 1776 NULL, 0, &ip6_use_deprecated, 0, 1777 CTL_NET, PF_INET6, IPPROTO_IPV6, 1778 IPV6CTL_USE_DEPRECATED, CTL_EOL); 1779 sysctl_createv(clog, 0, NULL, NULL, 1780 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1781 CTLTYPE_INT, "rr_prune", NULL, 1782 NULL, 0, &ip6_rr_prune, 0, 1783 CTL_NET, PF_INET6, IPPROTO_IPV6, 1784 IPV6CTL_RR_PRUNE, CTL_EOL); 1785 sysctl_createv(clog, 0, NULL, NULL, 1786 CTLFLAG_PERMANENT 1787 #ifndef INET6_BINDV6ONLY 1788 |CTLFLAG_READWRITE, 1789 #endif 1790 CTLTYPE_INT, "v6only", 1791 SYSCTL_DESCR("Disallow PF_INET6 sockets from connecting " 1792 "to PF_INET sockets"), 1793 NULL, 0, &ip6_v6only, 0, 1794 CTL_NET, PF_INET6, IPPROTO_IPV6, 1795 IPV6CTL_V6ONLY, CTL_EOL); 1796 sysctl_createv(clog, 0, NULL, NULL, 1797 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1798 CTLTYPE_INT, "anonportmin", 1799 SYSCTL_DESCR("Lowest ephemeral port number to assign"), 1800 sysctl_net_inet_ip_ports, 0, &ip6_anonportmin, 0, 1801 CTL_NET, PF_INET6, IPPROTO_IPV6, 1802 IPV6CTL_ANONPORTMIN, CTL_EOL); 1803 sysctl_createv(clog, 0, NULL, NULL, 1804 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1805 CTLTYPE_INT, "anonportmax", 1806 SYSCTL_DESCR("Highest ephemeral port number to assign"), 1807 sysctl_net_inet_ip_ports, 0, &ip6_anonportmax, 0, 1808 CTL_NET, PF_INET6, IPPROTO_IPV6, 1809 IPV6CTL_ANONPORTMAX, CTL_EOL); 1810 #ifndef IPNOPRIVPORTS 1811 sysctl_createv(clog, 0, NULL, NULL, 1812 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1813 CTLTYPE_INT, "lowportmin", 1814 SYSCTL_DESCR("Lowest privileged ephemeral port number " 1815 "to assign"), 1816 sysctl_net_inet_ip_ports, 0, &ip6_lowportmin, 0, 1817 CTL_NET, PF_INET6, IPPROTO_IPV6, 1818 IPV6CTL_LOWPORTMIN, CTL_EOL); 1819 sysctl_createv(clog, 0, NULL, NULL, 1820 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1821 CTLTYPE_INT, "lowportmax", 1822 SYSCTL_DESCR("Highest privileged ephemeral port number " 1823 "to assign"), 1824 sysctl_net_inet_ip_ports, 0, &ip6_lowportmax, 0, 1825 CTL_NET, PF_INET6, IPPROTO_IPV6, 1826 IPV6CTL_LOWPORTMAX, CTL_EOL); 1827 #endif /* IPNOPRIVPORTS */ 1828 sysctl_createv(clog, 0, NULL, NULL, 1829 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1830 CTLTYPE_INT, "use_tempaddr", 1831 SYSCTL_DESCR("Use temporary address"), 1832 NULL, 0, &ip6_use_tempaddr, 0, 1833 CTL_NET, PF_INET6, IPPROTO_IPV6, 1834 CTL_CREATE, CTL_EOL); 1835 sysctl_createv(clog, 0, NULL, NULL, 1836 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1837 CTLTYPE_INT, "temppltime", 1838 SYSCTL_DESCR("preferred lifetime of a temporary address"), 1839 NULL, 0, &ip6_temp_preferred_lifetime, 0, 1840 CTL_NET, PF_INET6, IPPROTO_IPV6, 1841 CTL_CREATE, CTL_EOL); 1842 sysctl_createv(clog, 0, NULL, NULL, 1843 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1844 CTLTYPE_INT, "tempvltime", 1845 SYSCTL_DESCR("valid lifetime of a temporary address"), 1846 NULL, 0, &ip6_temp_valid_lifetime, 0, 1847 CTL_NET, PF_INET6, IPPROTO_IPV6, 1848 CTL_CREATE, CTL_EOL); 1849 sysctl_createv(clog, 0, NULL, NULL, 1850 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1851 CTLTYPE_INT, "maxfrags", 1852 SYSCTL_DESCR("Maximum fragments in reassembly queue"), 1853 NULL, 0, &ip6_maxfrags, 0, 1854 CTL_NET, PF_INET6, IPPROTO_IPV6, 1855 IPV6CTL_MAXFRAGS, CTL_EOL); 1856 sysctl_createv(clog, 0, NULL, NULL, 1857 CTLFLAG_PERMANENT, 1858 CTLTYPE_STRUCT, "stats", 1859 SYSCTL_DESCR("IPv6 statistics"), 1860 NULL, 0, &ip6stat, sizeof(ip6stat), 1861 CTL_NET, PF_INET6, IPPROTO_IPV6, 1862 IPV6CTL_STATS, CTL_EOL); 1863 sysctl_createv(clog, 0, NULL, NULL, 1864 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1865 CTLTYPE_INT, "use_defaultzone", 1866 SYSCTL_DESCR("Whether to use the default scope zones"), 1867 NULL, 0, &ip6_use_defzone, 0, 1868 CTL_NET, PF_INET6, IPPROTO_IPV6, 1869 IPV6CTL_USE_DEFAULTZONE, CTL_EOL); 1870 sysctl_createv(clog, 0, NULL, NULL, 1871 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1872 CTLTYPE_INT, "mcast_pmtu", 1873 SYSCTL_DESCR("Enable pMTU discovery for multicast packet"), 1874 NULL, 0, &ip6_mcast_pmtu, 0, 1875 CTL_NET, PF_INET6, IPPROTO_IPV6, 1876 CTL_CREATE, CTL_EOL); 1877 } 1878
Indexes created Mon Sep 22 05:09:51 GMT 2025