1 /* $NetBSD: ip6_input.c,v 1.144 2013/10/04 14:23:14 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 1.144 2013/10/04 14:23:14 christos 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/netisr.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_icmp.h> 101 #endif /* INET */ 102 #include <netinet/ip6.h> 103 #include <netinet/portalgo.h> 104 #include <netinet6/in6_var.h> 105 #include <netinet6/ip6_var.h> 106 #include <netinet6/ip6_private.h> 107 #include <netinet6/in6_pcb.h> 108 #include <netinet/icmp6.h> 109 #include <netinet6/scope6_var.h> 110 #include <netinet6/in6_ifattach.h> 111 #include <netinet6/nd6.h> 112 113 #ifdef IPSEC 114 #include <netipsec/ipsec.h> 115 #include <netipsec/ipsec6.h> 116 #include <netipsec/key.h> 117 #endif /* IPSEC */ 118 119 #ifdef COMPAT_50 120 #include <compat/sys/time.h> 121 #include <compat/sys/socket.h> 122 #endif 123 124 #include <netinet6/ip6protosw.h> 125 126 #include "faith.h" 127 #include "gif.h" 128 129 #if NGIF > 0 130 #include <netinet6/in6_gif.h> 131 #endif 132 133 #include <net/net_osdep.h> 134 135 extern struct domain inet6domain; 136 137 u_char ip6_protox[IPPROTO_MAX]; 138 static int ip6qmaxlen = IFQ_MAXLEN; 139 struct in6_ifaddr *in6_ifaddr; 140 struct ifqueue ip6intrq; 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 struct m_tag *ip6_setdstifaddr(struct mbuf *, const struct in6_ifaddr *); 154 155 static int ip6_process_hopopts(struct mbuf *, u_int8_t *, int, u_int32_t *, 156 u_int32_t *); 157 static struct mbuf *ip6_pullexthdr(struct mbuf *, size_t, int); 158 static void sysctl_net_inet6_ip6_setup(struct sysctllog **); 159 160 /* 161 * IP6 initialization: fill in IP6 protocol switch table. 162 * All protocols not implemented in kernel go to raw IP6 protocol handler. 163 */ 164 void 165 ip6_init(void) 166 { 167 const struct ip6protosw *pr; 168 int i; 169 170 sysctl_net_inet6_ip6_setup(NULL); 171 pr = (const struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 172 if (pr == 0) 173 panic("ip6_init"); 174 for (i = 0; i < IPPROTO_MAX; i++) 175 ip6_protox[i] = pr - inet6sw; 176 for (pr = (const struct ip6protosw *)inet6domain.dom_protosw; 177 pr < (const struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++) 178 if (pr->pr_domain->dom_family == PF_INET6 && 179 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) 180 ip6_protox[pr->pr_protocol] = pr - inet6sw; 181 ip6intrq.ifq_maxlen = ip6qmaxlen; 182 scope6_init(); 183 addrsel_policy_init(); 184 nd6_init(); 185 frag6_init(); 186 ip6_desync_factor = cprng_fast32() % MAX_TEMP_DESYNC_FACTOR; 187 188 ip6_init2(NULL); 189 #ifdef GATEWAY 190 ip6flow_init(ip6_hashsize); 191 #endif 192 /* Register our Packet Filter hook. */ 193 inet6_pfil_hook = pfil_head_create(PFIL_TYPE_AF, (void *)AF_INET6); 194 KASSERT(inet6_pfil_hook != NULL); 195 196 ip6stat_percpu = percpu_alloc(sizeof(uint64_t) * IP6_NSTATS); 197 } 198 199 static void 200 ip6_init2(void *dummy) 201 { 202 203 /* nd6_timer_init */ 204 callout_init(&nd6_timer_ch, CALLOUT_MPSAFE); 205 callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL); 206 207 /* timer for regeneranation of temporary addresses randomize ID */ 208 callout_init(&in6_tmpaddrtimer_ch, CALLOUT_MPSAFE); 209 callout_reset(&in6_tmpaddrtimer_ch, 210 (ip6_temp_preferred_lifetime - ip6_desync_factor - 211 ip6_temp_regen_advance) * hz, 212 in6_tmpaddrtimer, NULL); 213 } 214 215 /* 216 * IP6 input interrupt handling. Just pass the packet to ip6_input. 217 */ 218 void 219 ip6intr(void) 220 { 221 int s; 222 struct mbuf *m; 223 224 mutex_enter(softnet_lock); 225 KERNEL_LOCK(1, NULL); 226 for (;;) { 227 s = splnet(); 228 IF_DEQUEUE(&ip6intrq, m); 229 splx(s); 230 if (m == 0) 231 break; 232 /* drop the packet if IPv6 operation is disabled on the IF */ 233 if ((ND_IFINFO(m->m_pkthdr.rcvif)->flags & ND6_IFF_IFDISABLED)) { 234 m_freem(m); 235 break; 236 } 237 ip6_input(m); 238 } 239 KERNEL_UNLOCK_ONE(NULL); 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 #ifdef IPSEC 261 struct m_tag *mtag; 262 struct tdb_ident *tdbi; 263 struct secpolicy *sp; 264 int s, error; 265 #endif 266 267 /* 268 * make sure we don't have onion peering information into m_tag. 269 */ 270 ip6_delaux(m); 271 272 /* 273 * mbuf statistics 274 */ 275 if (m->m_flags & M_EXT) { 276 if (m->m_next) 277 IP6_STATINC(IP6_STAT_MEXT2M); 278 else 279 IP6_STATINC(IP6_STAT_MEXT1); 280 } else { 281 #define M2MMAX 32 282 if (m->m_next) { 283 if (m->m_flags & M_LOOP) { 284 /*XXX*/ IP6_STATINC(IP6_STAT_M2M + lo0ifp->if_index); 285 } else if (m->m_pkthdr.rcvif->if_index < M2MMAX) { 286 IP6_STATINC(IP6_STAT_M2M + 287 m->m_pkthdr.rcvif->if_index); 288 } else 289 IP6_STATINC(IP6_STAT_M2M); 290 } else 291 IP6_STATINC(IP6_STAT_M1); 292 #undef M2MMAX 293 } 294 295 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive); 296 IP6_STATINC(IP6_STAT_TOTAL); 297 298 /* 299 * If the IPv6 header is not aligned, slurp it up into a new 300 * mbuf with space for link headers, in the event we forward 301 * it. Otherwise, if it is aligned, make sure the entire base 302 * IPv6 header is in the first mbuf of the chain. 303 */ 304 if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 305 struct ifnet *inifp = m->m_pkthdr.rcvif; 306 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 307 (max_linkhdr + 3) & ~3)) == NULL) { 308 /* XXXJRT new stat, please */ 309 IP6_STATINC(IP6_STAT_TOOSMALL); 310 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 311 return; 312 } 313 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 314 struct ifnet *inifp = m->m_pkthdr.rcvif; 315 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 316 IP6_STATINC(IP6_STAT_TOOSMALL); 317 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 318 return; 319 } 320 } 321 322 ip6 = mtod(m, struct ip6_hdr *); 323 324 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 325 IP6_STATINC(IP6_STAT_BADVERS); 326 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 327 goto bad; 328 } 329 330 /* 331 * Assume that we can create a fast-forward IP flow entry 332 * based on this packet. 333 */ 334 m->m_flags |= M_CANFASTFWD; 335 336 /* 337 * Run through list of hooks for input packets. If there are any 338 * filters which require that additional packets in the flow are 339 * not fast-forwarded, they must clear the M_CANFASTFWD flag. 340 * Note that filters must _never_ set this flag, as another filter 341 * in the list may have previously cleared it. 342 */ 343 /* 344 * let ipfilter look at packet on the wire, 345 * not the decapsulated packet. 346 */ 347 #if defined(IPSEC) 348 if (!ipsec_indone(m)) 349 #else 350 if (1) 351 #endif 352 { 353 struct in6_addr odst; 354 355 odst = ip6->ip6_dst; 356 if (pfil_run_hooks(inet6_pfil_hook, &m, m->m_pkthdr.rcvif, 357 PFIL_IN) != 0) 358 return; 359 if (m == NULL) 360 return; 361 ip6 = mtod(m, struct ip6_hdr *); 362 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst); 363 } 364 365 IP6_STATINC(IP6_STAT_NXTHIST + ip6->ip6_nxt); 366 367 #ifdef ALTQ 368 if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) { 369 /* packet is dropped by traffic conditioner */ 370 return; 371 } 372 #endif 373 374 /* 375 * Check against address spoofing/corruption. 376 */ 377 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) || 378 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) { 379 /* 380 * XXX: "badscope" is not very suitable for a multicast source. 381 */ 382 IP6_STATINC(IP6_STAT_BADSCOPE); 383 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 384 goto bad; 385 } 386 /* 387 * The following check is not documented in specs. A malicious 388 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack 389 * and bypass security checks (act as if it was from 127.0.0.1 by using 390 * IPv6 src ::ffff:127.0.0.1). Be cautious. 391 * 392 * This check chokes if we are in an SIIT cloud. As none of BSDs 393 * support IPv4-less kernel compilation, we cannot support SIIT 394 * environment at all. So, it makes more sense for us to reject any 395 * malicious packets for non-SIIT environment, than try to do a 396 * partial support for SIIT environment. 397 */ 398 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 399 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 400 IP6_STATINC(IP6_STAT_BADSCOPE); 401 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 402 goto bad; 403 } 404 #if 0 405 /* 406 * Reject packets with IPv4 compatible addresses (auto tunnel). 407 * 408 * The code forbids auto tunnel relay case in RFC1933 (the check is 409 * stronger than RFC1933). We may want to re-enable it if mech-xx 410 * is revised to forbid relaying case. 411 */ 412 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) || 413 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) { 414 IP6_STATINC(IP6_STAT_BADSCOPE); 415 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 416 goto bad; 417 } 418 #endif 419 420 /* 421 * Disambiguate address scope zones (if there is ambiguity). 422 * We first make sure that the original source or destination address 423 * is not in our internal form for scoped addresses. Such addresses 424 * are not necessarily invalid spec-wise, but we cannot accept them due 425 * to the usage conflict. 426 * in6_setscope() then also checks and rejects the cases where src or 427 * dst are the loopback address and the receiving interface 428 * is not loopback. 429 */ 430 if (__predict_false( 431 m_makewritable(&m, 0, sizeof(struct ip6_hdr), M_DONTWAIT))) 432 goto bad; 433 ip6 = mtod(m, struct ip6_hdr *); 434 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) { 435 IP6_STATINC(IP6_STAT_BADSCOPE); /* XXX */ 436 goto bad; 437 } 438 if (in6_setscope(&ip6->ip6_src, m->m_pkthdr.rcvif, NULL) || 439 in6_setscope(&ip6->ip6_dst, m->m_pkthdr.rcvif, NULL)) { 440 IP6_STATINC(IP6_STAT_BADSCOPE); 441 goto bad; 442 } 443 444 /* 445 * Multicast check 446 */ 447 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 448 struct in6_multi *in6m = 0; 449 450 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast); 451 /* 452 * See if we belong to the destination multicast group on the 453 * arrival interface. 454 */ 455 IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m); 456 if (in6m) 457 ours = 1; 458 else if (!ip6_mrouter) { 459 uint64_t *ip6s = IP6_STAT_GETREF(); 460 ip6s[IP6_STAT_NOTMEMBER]++; 461 ip6s[IP6_STAT_CANTFORWARD]++; 462 IP6_STAT_PUTREF(); 463 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 464 goto bad; 465 } 466 deliverifp = m->m_pkthdr.rcvif; 467 goto hbhcheck; 468 } 469 470 sockaddr_in6_init(&u.dst6, &ip6->ip6_dst, 0, 0, 0); 471 472 /* 473 * Unicast check 474 */ 475 rt = rtcache_lookup2(&ip6_forward_rt, &u.dst, 1, &hit); 476 if (hit) 477 IP6_STATINC(IP6_STAT_FORWARD_CACHEHIT); 478 else 479 IP6_STATINC(IP6_STAT_FORWARD_CACHEMISS); 480 481 #define rt6_getkey(__rt) satocsin6(rt_getkey(__rt)) 482 483 /* 484 * Accept the packet if the forwarding interface to the destination 485 * according to the routing table is the loopback interface, 486 * unless the associated route has a gateway. 487 * Note that this approach causes to accept a packet if there is a 488 * route to the loopback interface for the destination of the packet. 489 * But we think it's even useful in some situations, e.g. when using 490 * a special daemon which wants to intercept the packet. 491 */ 492 if (rt != NULL && 493 (rt->rt_flags & (RTF_HOST|RTF_GATEWAY)) == RTF_HOST && 494 !(rt->rt_flags & RTF_CLONED) && 495 #if 0 496 /* 497 * The check below is redundant since the comparison of 498 * the destination and the key of the rtentry has 499 * already done through looking up the routing table. 500 */ 501 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &rt6_getkey(rt)->sin6_addr) && 502 #endif 503 rt->rt_ifp->if_type == IFT_LOOP) { 504 struct in6_ifaddr *ia6 = (struct in6_ifaddr *)rt->rt_ifa; 505 if (ia6->ia6_flags & IN6_IFF_ANYCAST) 506 m->m_flags |= M_ANYCAST6; 507 /* 508 * packets to a tentative, duplicated, or somehow invalid 509 * address must not be accepted. 510 */ 511 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) { 512 /* this address is ready */ 513 ours = 1; 514 deliverifp = ia6->ia_ifp; /* correct? */ 515 goto hbhcheck; 516 } else { 517 /* address is not ready, so discard the packet. */ 518 nd6log((LOG_INFO, 519 "ip6_input: packet to an unready address %s->%s\n", 520 ip6_sprintf(&ip6->ip6_src), 521 ip6_sprintf(&ip6->ip6_dst))); 522 523 goto bad; 524 } 525 } 526 527 /* 528 * FAITH (Firewall Aided Internet Translator) 529 */ 530 #if defined(NFAITH) && 0 < NFAITH 531 if (ip6_keepfaith) { 532 if (rt != NULL && rt->rt_ifp != NULL && 533 rt->rt_ifp->if_type == IFT_FAITH) { 534 /* XXX do we need more sanity checks? */ 535 ours = 1; 536 deliverifp = rt->rt_ifp; /* faith */ 537 goto hbhcheck; 538 } 539 } 540 #endif 541 542 #if 0 543 { 544 /* 545 * Last resort: check in6_ifaddr for incoming interface. 546 * The code is here until I update the "goto ours hack" code above 547 * working right. 548 */ 549 struct ifaddr *ifa; 550 IFADDR_FOREACH(ifa, m->m_pkthdr.rcvif) { 551 if (ifa->ifa_addr == NULL) 552 continue; /* just for safety */ 553 if (ifa->ifa_addr->sa_family != AF_INET6) 554 continue; 555 if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) { 556 ours = 1; 557 deliverifp = ifa->ifa_ifp; 558 goto hbhcheck; 559 } 560 } 561 } 562 #endif 563 564 /* 565 * Now there is no reason to process the packet if it's not our own 566 * and we're not a router. 567 */ 568 if (!ip6_forwarding) { 569 IP6_STATINC(IP6_STAT_CANTFORWARD); 570 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 571 goto bad; 572 } 573 574 hbhcheck: 575 /* 576 * record address information into m_tag, if we don't have one yet. 577 * note that we are unable to record it, if the address is not listed 578 * as our interface address (e.g. multicast addresses, addresses 579 * within FAITH prefixes and such). 580 */ 581 if (deliverifp && ip6_getdstifaddr(m) == NULL) { 582 struct in6_ifaddr *ia6; 583 584 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 585 if (ia6 != NULL && ip6_setdstifaddr(m, ia6) == NULL) { 586 /* 587 * XXX maybe we should drop the packet here, 588 * as we could not provide enough information 589 * to the upper layers. 590 */ 591 } 592 } 593 594 /* 595 * Process Hop-by-Hop options header if it's contained. 596 * m may be modified in ip6_hopopts_input(). 597 * If a JumboPayload option is included, plen will also be modified. 598 */ 599 plen = (u_int32_t)ntohs(ip6->ip6_plen); 600 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 601 struct ip6_hbh *hbh; 602 603 if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) { 604 #if 0 /*touches NULL pointer*/ 605 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 606 #endif 607 return; /* m have already been freed */ 608 } 609 610 /* adjust pointer */ 611 ip6 = mtod(m, struct ip6_hdr *); 612 613 /* 614 * if the payload length field is 0 and the next header field 615 * indicates Hop-by-Hop Options header, then a Jumbo Payload 616 * option MUST be included. 617 */ 618 if (ip6->ip6_plen == 0 && plen == 0) { 619 /* 620 * Note that if a valid jumbo payload option is 621 * contained, ip6_hopopts_input() must set a valid 622 * (non-zero) payload length to the variable plen. 623 */ 624 IP6_STATINC(IP6_STAT_BADOPTIONS); 625 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 626 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 627 icmp6_error(m, ICMP6_PARAM_PROB, 628 ICMP6_PARAMPROB_HEADER, 629 (char *)&ip6->ip6_plen - (char *)ip6); 630 return; 631 } 632 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 633 sizeof(struct ip6_hbh)); 634 if (hbh == NULL) { 635 IP6_STATINC(IP6_STAT_TOOSHORT); 636 return; 637 } 638 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 639 nxt = hbh->ip6h_nxt; 640 641 /* 642 * accept the packet if a router alert option is included 643 * and we act as an IPv6 router. 644 */ 645 if (rtalert != ~0 && ip6_forwarding) 646 ours = 1; 647 } else 648 nxt = ip6->ip6_nxt; 649 650 /* 651 * Check that the amount of data in the buffers 652 * is as at least much as the IPv6 header would have us expect. 653 * Trim mbufs if longer than we expect. 654 * Drop packet if shorter than we expect. 655 */ 656 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 657 IP6_STATINC(IP6_STAT_TOOSHORT); 658 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 659 goto bad; 660 } 661 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 662 if (m->m_len == m->m_pkthdr.len) { 663 m->m_len = sizeof(struct ip6_hdr) + plen; 664 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 665 } else 666 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 667 } 668 669 /* 670 * Forward if desirable. 671 */ 672 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 673 /* 674 * If we are acting as a multicast router, all 675 * incoming multicast packets are passed to the 676 * kernel-level multicast forwarding function. 677 * The packet is returned (relatively) intact; if 678 * ip6_mforward() returns a non-zero value, the packet 679 * must be discarded, else it may be accepted below. 680 */ 681 if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) { 682 IP6_STATINC(IP6_STAT_CANTFORWARD); 683 m_freem(m); 684 return; 685 } 686 if (!ours) { 687 m_freem(m); 688 return; 689 } 690 } else if (!ours) { 691 ip6_forward(m, srcrt); 692 return; 693 } 694 695 ip6 = mtod(m, struct ip6_hdr *); 696 697 /* 698 * Malicious party may be able to use IPv4 mapped addr to confuse 699 * tcp/udp stack and bypass security checks (act as if it was from 700 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious. 701 * 702 * For SIIT end node behavior, you may want to disable the check. 703 * However, you will become vulnerable to attacks using IPv4 mapped 704 * source. 705 */ 706 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 707 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 708 IP6_STATINC(IP6_STAT_BADSCOPE); 709 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 710 goto bad; 711 } 712 713 /* 714 * Tell launch routine the next header 715 */ 716 #ifdef IFA_STATS 717 if (deliverifp != NULL) { 718 struct in6_ifaddr *ia6; 719 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 720 if (ia6) 721 ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len; 722 } 723 #endif 724 IP6_STATINC(IP6_STAT_DELIVERED); 725 in6_ifstat_inc(deliverifp, ifs6_in_deliver); 726 nest = 0; 727 728 rh_present = 0; 729 while (nxt != IPPROTO_DONE) { 730 if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) { 731 IP6_STATINC(IP6_STAT_TOOMANYHDR); 732 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 733 goto bad; 734 } 735 736 /* 737 * protection against faulty packet - there should be 738 * more sanity checks in header chain processing. 739 */ 740 if (m->m_pkthdr.len < off) { 741 IP6_STATINC(IP6_STAT_TOOSHORT); 742 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 743 goto bad; 744 } 745 746 if (nxt == IPPROTO_ROUTING) { 747 if (rh_present++) { 748 in6_ifstat_inc(m->m_pkthdr.rcvif, 749 ifs6_in_hdrerr); 750 IP6_STATINC(IP6_STAT_BADOPTIONS); 751 goto bad; 752 } 753 } 754 755 #ifdef IPSEC 756 /* 757 * enforce IPsec policy checking if we are seeing last header. 758 * note that we do not visit this with protocols with pcb layer 759 * code - like udp/tcp/raw ip. 760 */ 761 if ((inet6sw[ip_protox[nxt]].pr_flags & PR_LASTHDR) != 0) { 762 /* 763 * Check if the packet has already had IPsec processing 764 * done. If so, then just pass it along. This tag gets 765 * set during AH, ESP, etc. input handling, before the 766 * packet is returned to the ip input queue for delivery. 767 */ 768 mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL); 769 s = splsoftnet(); 770 if (mtag != NULL) { 771 tdbi = (struct tdb_ident *)(mtag + 1); 772 sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND); 773 } else { 774 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, 775 IP_FORWARDING, &error); 776 } 777 if (sp != NULL) { 778 /* 779 * Check security policy against packet attributes. 780 */ 781 error = ipsec_in_reject(sp, m); 782 KEY_FREESP(&sp); 783 } else { 784 /* XXX error stat??? */ 785 error = EINVAL; 786 DPRINTF(("ip6_input: no SP, packet discarded\n"));/*XXX*/ 787 } 788 splx(s); 789 if (error) 790 goto bad; 791 } 792 #endif /* IPSEC */ 793 794 795 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt); 796 } 797 return; 798 bad: 799 m_freem(m); 800 } 801 802 /* 803 * set/grab in6_ifaddr correspond to IPv6 destination address. 804 */ 805 static struct m_tag * 806 ip6_setdstifaddr(struct mbuf *m, const struct in6_ifaddr *ia) 807 { 808 struct m_tag *mtag; 809 struct ip6aux *ip6a; 810 811 mtag = ip6_addaux(m); 812 if (mtag == NULL) 813 return NULL; 814 815 ip6a = (struct ip6aux *)(mtag + 1); 816 if (in6_setscope(&ip6a->ip6a_src, ia->ia_ifp, &ip6a->ip6a_scope_id)) { 817 IP6_STATINC(IP6_STAT_BADSCOPE); 818 return NULL; 819 } 820 821 ip6a->ip6a_src = ia->ia_addr.sin6_addr; 822 ip6a->ip6a_flags = ia->ia6_flags; 823 return mtag; 824 } 825 826 const struct ip6aux * 827 ip6_getdstifaddr(struct mbuf *m) 828 { 829 struct m_tag *mtag; 830 831 mtag = ip6_findaux(m); 832 if (mtag != NULL) 833 return (struct ip6aux *)(mtag + 1); 834 else 835 return NULL; 836 } 837 838 /* 839 * Hop-by-Hop options header processing. If a valid jumbo payload option is 840 * included, the real payload length will be stored in plenp. 841 * 842 * rtalertp - XXX: should be stored more smart way 843 */ 844 int 845 ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp, 846 struct mbuf **mp, int *offp) 847 { 848 struct mbuf *m = *mp; 849 int off = *offp, hbhlen; 850 struct ip6_hbh *hbh; 851 852 /* validation of the length of the header */ 853 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, 854 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh)); 855 if (hbh == NULL) { 856 IP6_STATINC(IP6_STAT_TOOSHORT); 857 return -1; 858 } 859 hbhlen = (hbh->ip6h_len + 1) << 3; 860 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 861 hbhlen); 862 if (hbh == NULL) { 863 IP6_STATINC(IP6_STAT_TOOSHORT); 864 return -1; 865 } 866 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 867 off += hbhlen; 868 hbhlen -= sizeof(struct ip6_hbh); 869 870 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 871 hbhlen, rtalertp, plenp) < 0) 872 return (-1); 873 874 *offp = off; 875 *mp = m; 876 return (0); 877 } 878 879 /* 880 * Search header for all Hop-by-hop options and process each option. 881 * This function is separate from ip6_hopopts_input() in order to 882 * handle a case where the sending node itself process its hop-by-hop 883 * options header. In such a case, the function is called from ip6_output(). 884 * 885 * The function assumes that hbh header is located right after the IPv6 header 886 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to 887 * opthead + hbhlen is located in continuous memory region. 888 */ 889 static int 890 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen, 891 u_int32_t *rtalertp, u_int32_t *plenp) 892 { 893 struct ip6_hdr *ip6; 894 int optlen = 0; 895 u_int8_t *opt = opthead; 896 u_int16_t rtalert_val; 897 u_int32_t jumboplen; 898 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh); 899 900 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 901 switch (*opt) { 902 case IP6OPT_PAD1: 903 optlen = 1; 904 break; 905 case IP6OPT_PADN: 906 if (hbhlen < IP6OPT_MINLEN) { 907 IP6_STATINC(IP6_STAT_TOOSMALL); 908 goto bad; 909 } 910 optlen = *(opt + 1) + 2; 911 break; 912 case IP6OPT_RTALERT: 913 /* XXX may need check for alignment */ 914 if (hbhlen < IP6OPT_RTALERT_LEN) { 915 IP6_STATINC(IP6_STAT_TOOSMALL); 916 goto bad; 917 } 918 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) { 919 /* XXX stat */ 920 icmp6_error(m, ICMP6_PARAM_PROB, 921 ICMP6_PARAMPROB_HEADER, 922 erroff + opt + 1 - opthead); 923 return (-1); 924 } 925 optlen = IP6OPT_RTALERT_LEN; 926 memcpy((void *)&rtalert_val, (void *)(opt + 2), 2); 927 *rtalertp = ntohs(rtalert_val); 928 break; 929 case IP6OPT_JUMBO: 930 /* XXX may need check for alignment */ 931 if (hbhlen < IP6OPT_JUMBO_LEN) { 932 IP6_STATINC(IP6_STAT_TOOSMALL); 933 goto bad; 934 } 935 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) { 936 /* XXX stat */ 937 icmp6_error(m, ICMP6_PARAM_PROB, 938 ICMP6_PARAMPROB_HEADER, 939 erroff + opt + 1 - opthead); 940 return (-1); 941 } 942 optlen = IP6OPT_JUMBO_LEN; 943 944 /* 945 * IPv6 packets that have non 0 payload length 946 * must not contain a jumbo payload option. 947 */ 948 ip6 = mtod(m, struct ip6_hdr *); 949 if (ip6->ip6_plen) { 950 IP6_STATINC(IP6_STAT_BADOPTIONS); 951 icmp6_error(m, ICMP6_PARAM_PROB, 952 ICMP6_PARAMPROB_HEADER, 953 erroff + opt - opthead); 954 return (-1); 955 } 956 957 /* 958 * We may see jumbolen in unaligned location, so 959 * we'd need to perform bcopy(). 960 */ 961 memcpy(&jumboplen, opt + 2, sizeof(jumboplen)); 962 jumboplen = (u_int32_t)htonl(jumboplen); 963 964 #if 1 965 /* 966 * if there are multiple jumbo payload options, 967 * *plenp will be non-zero and the packet will be 968 * rejected. 969 * the behavior may need some debate in ipngwg - 970 * multiple options does not make sense, however, 971 * there's no explicit mention in specification. 972 */ 973 if (*plenp != 0) { 974 IP6_STATINC(IP6_STAT_BADOPTIONS); 975 icmp6_error(m, ICMP6_PARAM_PROB, 976 ICMP6_PARAMPROB_HEADER, 977 erroff + opt + 2 - opthead); 978 return (-1); 979 } 980 #endif 981 982 /* 983 * jumbo payload length must be larger than 65535. 984 */ 985 if (jumboplen <= IPV6_MAXPACKET) { 986 IP6_STATINC(IP6_STAT_BADOPTIONS); 987 icmp6_error(m, ICMP6_PARAM_PROB, 988 ICMP6_PARAMPROB_HEADER, 989 erroff + opt + 2 - opthead); 990 return (-1); 991 } 992 *plenp = jumboplen; 993 994 break; 995 default: /* unknown option */ 996 if (hbhlen < IP6OPT_MINLEN) { 997 IP6_STATINC(IP6_STAT_TOOSMALL); 998 goto bad; 999 } 1000 optlen = ip6_unknown_opt(opt, m, 1001 erroff + opt - opthead); 1002 if (optlen == -1) 1003 return (-1); 1004 optlen += 2; 1005 break; 1006 } 1007 } 1008 1009 return (0); 1010 1011 bad: 1012 m_freem(m); 1013 return (-1); 1014 } 1015 1016 /* 1017 * Unknown option processing. 1018 * The third argument `off' is the offset from the IPv6 header to the option, 1019 * which is necessary if the IPv6 header the and option header and IPv6 header 1020 * is not continuous in order to return an ICMPv6 error. 1021 */ 1022 int 1023 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off) 1024 { 1025 struct ip6_hdr *ip6; 1026 1027 switch (IP6OPT_TYPE(*optp)) { 1028 case IP6OPT_TYPE_SKIP: /* ignore the option */ 1029 return ((int)*(optp + 1)); 1030 case IP6OPT_TYPE_DISCARD: /* silently discard */ 1031 m_freem(m); 1032 return (-1); 1033 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 1034 IP6_STATINC(IP6_STAT_BADOPTIONS); 1035 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 1036 return (-1); 1037 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 1038 IP6_STATINC(IP6_STAT_BADOPTIONS); 1039 ip6 = mtod(m, struct ip6_hdr *); 1040 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 1041 (m->m_flags & (M_BCAST|M_MCAST))) 1042 m_freem(m); 1043 else 1044 icmp6_error(m, ICMP6_PARAM_PROB, 1045 ICMP6_PARAMPROB_OPTION, off); 1046 return (-1); 1047 } 1048 1049 m_freem(m); /* XXX: NOTREACHED */ 1050 return (-1); 1051 } 1052 1053 /* 1054 * Create the "control" list for this pcb. 1055 * 1056 * The routine will be called from upper layer handlers like tcp6_input(). 1057 * Thus the routine assumes that the caller (tcp6_input) have already 1058 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the 1059 * very first mbuf on the mbuf chain. 1060 * We may want to add some infinite loop prevention or sanity checks for safety. 1061 * (This applies only when you are using KAME mbuf chain restriction, i.e. 1062 * you are using IP6_EXTHDR_CHECK() not m_pulldown()) 1063 */ 1064 void 1065 ip6_savecontrol(struct in6pcb *in6p, struct mbuf **mp, 1066 struct ip6_hdr *ip6, struct mbuf *m) 1067 { 1068 #ifdef RFC2292 1069 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y)) 1070 #else 1071 #define IS2292(x, y) (y) 1072 #endif 1073 1074 if (in6p->in6p_socket->so_options & SO_TIMESTAMP 1075 #ifdef SO_OTIMESTAMP 1076 || in6p->in6p_socket->so_options & SO_OTIMESTAMP 1077 #endif 1078 ) { 1079 struct timeval tv; 1080 1081 microtime(&tv); 1082 #ifdef SO_OTIMESTAMP 1083 if (in6p->in6p_socket->so_options & SO_OTIMESTAMP) { 1084 struct timeval50 tv50; 1085 timeval_to_timeval50(&tv, &tv50); 1086 *mp = sbcreatecontrol((void *) &tv50, sizeof(tv50), 1087 SCM_OTIMESTAMP, SOL_SOCKET); 1088 } else 1089 #endif 1090 *mp = sbcreatecontrol((void *) &tv, sizeof(tv), 1091 SCM_TIMESTAMP, SOL_SOCKET); 1092 if (*mp) 1093 mp = &(*mp)->m_next; 1094 } 1095 1096 /* some OSes call this logic with IPv4 packet, for SO_TIMESTAMP */ 1097 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) 1098 return; 1099 1100 /* RFC 2292 sec. 5 */ 1101 if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) { 1102 struct in6_pktinfo pi6; 1103 1104 memcpy(&pi6.ipi6_addr, &ip6->ip6_dst, sizeof(struct in6_addr)); 1105 in6_clearscope(&pi6.ipi6_addr); /* XXX */ 1106 pi6.ipi6_ifindex = m->m_pkthdr.rcvif ? 1107 m->m_pkthdr.rcvif->if_index : 0; 1108 *mp = sbcreatecontrol((void *) &pi6, 1109 sizeof(struct in6_pktinfo), 1110 IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6); 1111 if (*mp) 1112 mp = &(*mp)->m_next; 1113 } 1114 1115 if (in6p->in6p_flags & IN6P_HOPLIMIT) { 1116 int hlim = ip6->ip6_hlim & 0xff; 1117 1118 *mp = sbcreatecontrol((void *) &hlim, sizeof(int), 1119 IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6); 1120 if (*mp) 1121 mp = &(*mp)->m_next; 1122 } 1123 1124 if ((in6p->in6p_flags & IN6P_TCLASS) != 0) { 1125 u_int32_t flowinfo; 1126 int tclass; 1127 1128 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK); 1129 flowinfo >>= 20; 1130 1131 tclass = flowinfo & 0xff; 1132 *mp = sbcreatecontrol((void *)&tclass, sizeof(tclass), 1133 IPV6_TCLASS, IPPROTO_IPV6); 1134 1135 if (*mp) 1136 mp = &(*mp)->m_next; 1137 } 1138 1139 /* 1140 * IPV6_HOPOPTS socket option. Recall that we required super-user 1141 * privilege for the option (see ip6_ctloutput), but it might be too 1142 * strict, since there might be some hop-by-hop options which can be 1143 * returned to normal user. 1144 * See also RFC3542 section 8 (or RFC2292 section 6). 1145 */ 1146 if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0) { 1147 /* 1148 * Check if a hop-by-hop options header is contatined in the 1149 * received packet, and if so, store the options as ancillary 1150 * data. Note that a hop-by-hop options header must be 1151 * just after the IPv6 header, which fact is assured through 1152 * the IPv6 input processing. 1153 */ 1154 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1155 if (xip6->ip6_nxt == IPPROTO_HOPOPTS) { 1156 struct ip6_hbh *hbh; 1157 int hbhlen; 1158 struct mbuf *ext; 1159 1160 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr), 1161 xip6->ip6_nxt); 1162 if (ext == NULL) { 1163 IP6_STATINC(IP6_STAT_TOOSHORT); 1164 return; 1165 } 1166 hbh = mtod(ext, struct ip6_hbh *); 1167 hbhlen = (hbh->ip6h_len + 1) << 3; 1168 if (hbhlen != ext->m_len) { 1169 m_freem(ext); 1170 IP6_STATINC(IP6_STAT_TOOSHORT); 1171 return; 1172 } 1173 1174 /* 1175 * XXX: We copy whole the header even if a jumbo 1176 * payload option is included, which option is to 1177 * be removed before returning in the RFC 2292. 1178 * Note: this constraint is removed in RFC3542. 1179 */ 1180 *mp = sbcreatecontrol((void *)hbh, hbhlen, 1181 IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS), 1182 IPPROTO_IPV6); 1183 if (*mp) 1184 mp = &(*mp)->m_next; 1185 m_freem(ext); 1186 } 1187 } 1188 1189 /* IPV6_DSTOPTS and IPV6_RTHDR socket options */ 1190 if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) { 1191 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1192 int nxt = xip6->ip6_nxt, off = sizeof(struct ip6_hdr); 1193 1194 /* 1195 * Search for destination options headers or routing 1196 * header(s) through the header chain, and stores each 1197 * header as ancillary data. 1198 * Note that the order of the headers remains in 1199 * the chain of ancillary data. 1200 */ 1201 for (;;) { /* is explicit loop prevention necessary? */ 1202 struct ip6_ext *ip6e = NULL; 1203 int elen; 1204 struct mbuf *ext = NULL; 1205 1206 /* 1207 * if it is not an extension header, don't try to 1208 * pull it from the chain. 1209 */ 1210 switch (nxt) { 1211 case IPPROTO_DSTOPTS: 1212 case IPPROTO_ROUTING: 1213 case IPPROTO_HOPOPTS: 1214 case IPPROTO_AH: /* is it possible? */ 1215 break; 1216 default: 1217 goto loopend; 1218 } 1219 1220 ext = ip6_pullexthdr(m, off, nxt); 1221 if (ext == NULL) { 1222 IP6_STATINC(IP6_STAT_TOOSHORT); 1223 return; 1224 } 1225 ip6e = mtod(ext, struct ip6_ext *); 1226 if (nxt == IPPROTO_AH) 1227 elen = (ip6e->ip6e_len + 2) << 2; 1228 else 1229 elen = (ip6e->ip6e_len + 1) << 3; 1230 if (elen != ext->m_len) { 1231 m_freem(ext); 1232 IP6_STATINC(IP6_STAT_TOOSHORT); 1233 return; 1234 } 1235 KASSERT(IP6_HDR_ALIGNED_P(ip6e)); 1236 1237 switch (nxt) { 1238 case IPPROTO_DSTOPTS: 1239 if (!(in6p->in6p_flags & IN6P_DSTOPTS)) 1240 break; 1241 1242 *mp = sbcreatecontrol((void *)ip6e, elen, 1243 IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS), 1244 IPPROTO_IPV6); 1245 if (*mp) 1246 mp = &(*mp)->m_next; 1247 break; 1248 1249 case IPPROTO_ROUTING: 1250 if (!(in6p->in6p_flags & IN6P_RTHDR)) 1251 break; 1252 1253 *mp = sbcreatecontrol((void *)ip6e, elen, 1254 IS2292(IPV6_2292RTHDR, IPV6_RTHDR), 1255 IPPROTO_IPV6); 1256 if (*mp) 1257 mp = &(*mp)->m_next; 1258 break; 1259 1260 case IPPROTO_HOPOPTS: 1261 case IPPROTO_AH: /* is it possible? */ 1262 break; 1263 1264 default: 1265 /* 1266 * other cases have been filtered in the above. 1267 * none will visit this case. here we supply 1268 * the code just in case (nxt overwritten or 1269 * other cases). 1270 */ 1271 m_freem(ext); 1272 goto loopend; 1273 1274 } 1275 1276 /* proceed with the next header. */ 1277 off += elen; 1278 nxt = ip6e->ip6e_nxt; 1279 ip6e = NULL; 1280 m_freem(ext); 1281 ext = NULL; 1282 } 1283 loopend: 1284 ; 1285 } 1286 } 1287 #undef IS2292 1288 1289 1290 void 1291 ip6_notify_pmtu(struct in6pcb *in6p, const struct sockaddr_in6 *dst, 1292 uint32_t *mtu) 1293 { 1294 struct socket *so; 1295 struct mbuf *m_mtu; 1296 struct ip6_mtuinfo mtuctl; 1297 1298 so = in6p->in6p_socket; 1299 1300 if (mtu == NULL) 1301 return; 1302 1303 #ifdef DIAGNOSTIC 1304 if (so == NULL) /* I believe this is impossible */ 1305 panic("ip6_notify_pmtu: socket is NULL"); 1306 #endif 1307 1308 memset(&mtuctl, 0, sizeof(mtuctl)); /* zero-clear for safety */ 1309 mtuctl.ip6m_mtu = *mtu; 1310 mtuctl.ip6m_addr = *dst; 1311 if (sa6_recoverscope(&mtuctl.ip6m_addr)) 1312 return; 1313 1314 if ((m_mtu = sbcreatecontrol((void *)&mtuctl, sizeof(mtuctl), 1315 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL) 1316 return; 1317 1318 if (sbappendaddr(&so->so_rcv, (const struct sockaddr *)dst, NULL, m_mtu) 1319 == 0) { 1320 m_freem(m_mtu); 1321 /* XXX: should count statistics */ 1322 } else 1323 sorwakeup(so); 1324 1325 return; 1326 } 1327 1328 /* 1329 * pull single extension header from mbuf chain. returns single mbuf that 1330 * contains the result, or NULL on error. 1331 */ 1332 static struct mbuf * 1333 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt) 1334 { 1335 struct ip6_ext ip6e; 1336 size_t elen; 1337 struct mbuf *n; 1338 1339 #ifdef DIAGNOSTIC 1340 switch (nxt) { 1341 case IPPROTO_DSTOPTS: 1342 case IPPROTO_ROUTING: 1343 case IPPROTO_HOPOPTS: 1344 case IPPROTO_AH: /* is it possible? */ 1345 break; 1346 default: 1347 printf("ip6_pullexthdr: invalid nxt=%d\n", nxt); 1348 } 1349 #endif 1350 1351 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1352 if (nxt == IPPROTO_AH) 1353 elen = (ip6e.ip6e_len + 2) << 2; 1354 else 1355 elen = (ip6e.ip6e_len + 1) << 3; 1356 1357 MGET(n, M_DONTWAIT, MT_DATA); 1358 if (n && elen >= MLEN) { 1359 MCLGET(n, M_DONTWAIT); 1360 if ((n->m_flags & M_EXT) == 0) { 1361 m_free(n); 1362 n = NULL; 1363 } 1364 } 1365 if (!n) 1366 return NULL; 1367 1368 n->m_len = 0; 1369 if (elen >= M_TRAILINGSPACE(n)) { 1370 m_free(n); 1371 return NULL; 1372 } 1373 1374 m_copydata(m, off, elen, mtod(n, void *)); 1375 n->m_len = elen; 1376 return n; 1377 } 1378 1379 /* 1380 * Get pointer to the previous header followed by the header 1381 * currently processed. 1382 * XXX: This function supposes that 1383 * M includes all headers, 1384 * the next header field and the header length field of each header 1385 * are valid, and 1386 * the sum of each header length equals to OFF. 1387 * Because of these assumptions, this function must be called very 1388 * carefully. Moreover, it will not be used in the near future when 1389 * we develop `neater' mechanism to process extension headers. 1390 */ 1391 u_int8_t * 1392 ip6_get_prevhdr(struct mbuf *m, int off) 1393 { 1394 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1395 1396 if (off == sizeof(struct ip6_hdr)) 1397 return (&ip6->ip6_nxt); 1398 else { 1399 int len, nxt; 1400 struct ip6_ext *ip6e = NULL; 1401 1402 nxt = ip6->ip6_nxt; 1403 len = sizeof(struct ip6_hdr); 1404 while (len < off) { 1405 ip6e = (struct ip6_ext *)(mtod(m, char *) + len); 1406 1407 switch (nxt) { 1408 case IPPROTO_FRAGMENT: 1409 len += sizeof(struct ip6_frag); 1410 break; 1411 case IPPROTO_AH: 1412 len += (ip6e->ip6e_len + 2) << 2; 1413 break; 1414 default: 1415 len += (ip6e->ip6e_len + 1) << 3; 1416 break; 1417 } 1418 nxt = ip6e->ip6e_nxt; 1419 } 1420 if (ip6e) 1421 return (&ip6e->ip6e_nxt); 1422 else 1423 return NULL; 1424 } 1425 } 1426 1427 /* 1428 * get next header offset. m will be retained. 1429 */ 1430 int 1431 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp) 1432 { 1433 struct ip6_hdr ip6; 1434 struct ip6_ext ip6e; 1435 struct ip6_frag fh; 1436 1437 /* just in case */ 1438 if (m == NULL) 1439 panic("ip6_nexthdr: m == NULL"); 1440 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off) 1441 return -1; 1442 1443 switch (proto) { 1444 case IPPROTO_IPV6: 1445 /* do not chase beyond intermediate IPv6 headers */ 1446 if (off != 0) 1447 return -1; 1448 if (m->m_pkthdr.len < off + sizeof(ip6)) 1449 return -1; 1450 m_copydata(m, off, sizeof(ip6), (void *)&ip6); 1451 if (nxtp) 1452 *nxtp = ip6.ip6_nxt; 1453 off += sizeof(ip6); 1454 return off; 1455 1456 case IPPROTO_FRAGMENT: 1457 /* 1458 * terminate parsing if it is not the first fragment, 1459 * it does not make sense to parse through it. 1460 */ 1461 if (m->m_pkthdr.len < off + sizeof(fh)) 1462 return -1; 1463 m_copydata(m, off, sizeof(fh), (void *)&fh); 1464 if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0) 1465 return -1; 1466 if (nxtp) 1467 *nxtp = fh.ip6f_nxt; 1468 off += sizeof(struct ip6_frag); 1469 return off; 1470 1471 case IPPROTO_AH: 1472 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1473 return -1; 1474 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1475 if (nxtp) 1476 *nxtp = ip6e.ip6e_nxt; 1477 off += (ip6e.ip6e_len + 2) << 2; 1478 if (m->m_pkthdr.len < off) 1479 return -1; 1480 return off; 1481 1482 case IPPROTO_HOPOPTS: 1483 case IPPROTO_ROUTING: 1484 case IPPROTO_DSTOPTS: 1485 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1486 return -1; 1487 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1488 if (nxtp) 1489 *nxtp = ip6e.ip6e_nxt; 1490 off += (ip6e.ip6e_len + 1) << 3; 1491 if (m->m_pkthdr.len < off) 1492 return -1; 1493 return off; 1494 1495 case IPPROTO_NONE: 1496 case IPPROTO_ESP: 1497 case IPPROTO_IPCOMP: 1498 /* give up */ 1499 return -1; 1500 1501 default: 1502 return -1; 1503 } 1504 } 1505 1506 /* 1507 * get offset for the last header in the chain. m will be kept untainted. 1508 */ 1509 int 1510 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp) 1511 { 1512 int newoff; 1513 int nxt; 1514 1515 if (!nxtp) { 1516 nxt = -1; 1517 nxtp = &nxt; 1518 } 1519 for (;;) { 1520 newoff = ip6_nexthdr(m, off, proto, nxtp); 1521 if (newoff < 0) 1522 return off; 1523 else if (newoff < off) 1524 return -1; /* invalid */ 1525 else if (newoff == off) 1526 return newoff; 1527 1528 off = newoff; 1529 proto = *nxtp; 1530 } 1531 } 1532 1533 struct m_tag * 1534 ip6_addaux(struct mbuf *m) 1535 { 1536 struct m_tag *mtag; 1537 1538 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1539 if (!mtag) { 1540 mtag = m_tag_get(PACKET_TAG_INET6, sizeof(struct ip6aux), 1541 M_NOWAIT); 1542 if (mtag) { 1543 m_tag_prepend(m, mtag); 1544 memset(mtag + 1, 0, sizeof(struct ip6aux)); 1545 } 1546 } 1547 return mtag; 1548 } 1549 1550 struct m_tag * 1551 ip6_findaux(struct mbuf *m) 1552 { 1553 struct m_tag *mtag; 1554 1555 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1556 return mtag; 1557 } 1558 1559 void 1560 ip6_delaux(struct mbuf *m) 1561 { 1562 struct m_tag *mtag; 1563 1564 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1565 if (mtag) 1566 m_tag_delete(m, mtag); 1567 } 1568 1569 #ifdef GATEWAY 1570 /* 1571 * sysctl helper routine for net.inet.ip6.maxflows. Since 1572 * we could reduce this value, call ip6flow_reap(); 1573 */ 1574 static int 1575 sysctl_net_inet6_ip6_maxflows(SYSCTLFN_ARGS) 1576 { 1577 int error; 1578 1579 error = sysctl_lookup(SYSCTLFN_CALL(rnode)); 1580 if (error || newp == NULL) 1581 return (error); 1582 1583 mutex_enter(softnet_lock); 1584 KERNEL_LOCK(1, NULL); 1585 1586 ip6flow_reap(0); 1587 1588 KERNEL_UNLOCK_ONE(NULL); 1589 mutex_exit(softnet_lock); 1590 1591 return (0); 1592 } 1593 1594 static int 1595 sysctl_net_inet6_ip6_hashsize(SYSCTLFN_ARGS) 1596 { 1597 int error, tmp; 1598 struct sysctlnode node; 1599 1600 node = *rnode; 1601 tmp = ip6_hashsize; 1602 node.sysctl_data = &tmp; 1603 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 1604 if (error || newp == NULL) 1605 return (error); 1606 1607 if ((tmp & (tmp - 1)) == 0 && tmp != 0) { 1608 /* 1609 * Can only fail due to malloc() 1610 */ 1611 mutex_enter(softnet_lock); 1612 KERNEL_LOCK(1, NULL); 1613 1614 error = ip6flow_invalidate_all(tmp); 1615 1616 KERNEL_UNLOCK_ONE(NULL); 1617 mutex_exit(softnet_lock); 1618 } else { 1619 /* 1620 * EINVAL if not a power of 2 1621 */ 1622 error = EINVAL; 1623 } 1624 1625 return error; 1626 } 1627 #endif /* GATEWAY */ 1628 1629 /* 1630 * System control for IP6 1631 */ 1632 1633 const u_char inet6ctlerrmap[PRC_NCMDS] = { 1634 0, 0, 0, 0, 1635 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 1636 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 1637 EMSGSIZE, EHOSTUNREACH, 0, 0, 1638 0, 0, 0, 0, 1639 ENOPROTOOPT 1640 }; 1641 1642 static int 1643 sysctl_net_inet6_ip6_stats(SYSCTLFN_ARGS) 1644 { 1645 1646 return (NETSTAT_SYSCTL(ip6stat_percpu, IP6_NSTATS)); 1647 } 1648 1649 static void 1650 sysctl_net_inet6_ip6_setup(struct sysctllog **clog) 1651 { 1652 #ifdef RFC2292 1653 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y)) 1654 #else 1655 #define IS2292(x, y) (y) 1656 #endif 1657 1658 sysctl_createv(clog, 0, NULL, NULL, 1659 CTLFLAG_PERMANENT, 1660 CTLTYPE_NODE, "net", NULL, 1661 NULL, 0, NULL, 0, 1662 CTL_NET, CTL_EOL); 1663 sysctl_createv(clog, 0, NULL, NULL, 1664 CTLFLAG_PERMANENT, 1665 CTLTYPE_NODE, "inet6", 1666 SYSCTL_DESCR("PF_INET6 related settings"), 1667 NULL, 0, NULL, 0, 1668 CTL_NET, PF_INET6, CTL_EOL); 1669 sysctl_createv(clog, 0, NULL, NULL, 1670 CTLFLAG_PERMANENT, 1671 CTLTYPE_NODE, "ip6", 1672 SYSCTL_DESCR("IPv6 related settings"), 1673 NULL, 0, NULL, 0, 1674 CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_EOL); 1675 1676 sysctl_createv(clog, 0, NULL, NULL, 1677 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1678 CTLTYPE_INT, "forwarding", 1679 SYSCTL_DESCR("Enable forwarding of INET6 datagrams"), 1680 NULL, 0, &ip6_forwarding, 0, 1681 CTL_NET, PF_INET6, IPPROTO_IPV6, 1682 IPV6CTL_FORWARDING, CTL_EOL); 1683 sysctl_createv(clog, 0, NULL, NULL, 1684 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1685 CTLTYPE_INT, "redirect", 1686 SYSCTL_DESCR("Enable sending of ICMPv6 redirect messages"), 1687 NULL, 0, &ip6_sendredirects, 0, 1688 CTL_NET, PF_INET6, IPPROTO_IPV6, 1689 IPV6CTL_SENDREDIRECTS, CTL_EOL); 1690 sysctl_createv(clog, 0, NULL, NULL, 1691 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1692 CTLTYPE_INT, "hlim", 1693 SYSCTL_DESCR("Hop limit for an INET6 datagram"), 1694 NULL, 0, &ip6_defhlim, 0, 1695 CTL_NET, PF_INET6, IPPROTO_IPV6, 1696 IPV6CTL_DEFHLIM, CTL_EOL); 1697 #ifdef notyet 1698 sysctl_createv(clog, 0, NULL, NULL, 1699 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1700 CTLTYPE_INT, "mtu", NULL, 1701 NULL, 0, &, 0, 1702 CTL_NET, PF_INET6, IPPROTO_IPV6, 1703 IPV6CTL_DEFMTU, CTL_EOL); 1704 #endif 1705 #ifdef __no_idea__ 1706 sysctl_createv(clog, 0, NULL, NULL, 1707 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1708 CTLTYPE_INT, "forwsrcrt", NULL, 1709 NULL, 0, &?, 0, 1710 CTL_NET, PF_INET6, IPPROTO_IPV6, 1711 IPV6CTL_FORWSRCRT, CTL_EOL); 1712 sysctl_createv(clog, 0, NULL, NULL, 1713 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1714 CTLTYPE_STRUCT, "mrtstats", NULL, 1715 NULL, 0, &?, sizeof(?), 1716 CTL_NET, PF_INET6, IPPROTO_IPV6, 1717 IPV6CTL_MRTSTATS, CTL_EOL); 1718 sysctl_createv(clog, 0, NULL, NULL, 1719 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1720 CTLTYPE_?, "mrtproto", NULL, 1721 NULL, 0, &?, sizeof(?), 1722 CTL_NET, PF_INET6, IPPROTO_IPV6, 1723 IPV6CTL_MRTPROTO, CTL_EOL); 1724 #endif 1725 sysctl_createv(clog, 0, NULL, NULL, 1726 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1727 CTLTYPE_INT, "maxfragpackets", 1728 SYSCTL_DESCR("Maximum number of fragments to buffer " 1729 "for reassembly"), 1730 NULL, 0, &ip6_maxfragpackets, 0, 1731 CTL_NET, PF_INET6, IPPROTO_IPV6, 1732 IPV6CTL_MAXFRAGPACKETS, CTL_EOL); 1733 #ifdef __no_idea__ 1734 sysctl_createv(clog, 0, NULL, NULL, 1735 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1736 CTLTYPE_INT, "sourcecheck", NULL, 1737 NULL, 0, &?, 0, 1738 CTL_NET, PF_INET6, IPPROTO_IPV6, 1739 IPV6CTL_SOURCECHECK, CTL_EOL); 1740 sysctl_createv(clog, 0, NULL, NULL, 1741 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1742 CTLTYPE_INT, "sourcecheck_logint", NULL, 1743 NULL, 0, &?, 0, 1744 CTL_NET, PF_INET6, IPPROTO_IPV6, 1745 IPV6CTL_SOURCECHECK_LOGINT, CTL_EOL); 1746 #endif 1747 sysctl_createv(clog, 0, NULL, NULL, 1748 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1749 CTLTYPE_INT, "accept_rtadv", 1750 SYSCTL_DESCR("Accept router advertisements"), 1751 NULL, 0, &ip6_accept_rtadv, 0, 1752 CTL_NET, PF_INET6, IPPROTO_IPV6, 1753 IPV6CTL_ACCEPT_RTADV, CTL_EOL); 1754 sysctl_createv(clog, 0, NULL, NULL, 1755 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1756 CTLTYPE_INT, "rtadv_maxroutes", 1757 SYSCTL_DESCR("Maximum number of routes accepted via router advertisements"), 1758 NULL, 0, &ip6_rtadv_maxroutes, 0, 1759 CTL_NET, PF_INET6, IPPROTO_IPV6, 1760 IPV6CTL_RTADV_MAXROUTES, CTL_EOL); 1761 sysctl_createv(clog, 0, NULL, NULL, 1762 CTLFLAG_PERMANENT, 1763 CTLTYPE_INT, "rtadv_numroutes", 1764 SYSCTL_DESCR("Current number of routes accepted via router advertisements"), 1765 NULL, 0, &nd6_numroutes, 0, 1766 CTL_NET, PF_INET6, IPPROTO_IPV6, 1767 IPV6CTL_RTADV_NUMROUTES, CTL_EOL); 1768 sysctl_createv(clog, 0, NULL, NULL, 1769 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1770 CTLTYPE_INT, "keepfaith", 1771 SYSCTL_DESCR("Activate faith interface"), 1772 NULL, 0, &ip6_keepfaith, 0, 1773 CTL_NET, PF_INET6, IPPROTO_IPV6, 1774 IPV6CTL_KEEPFAITH, CTL_EOL); 1775 sysctl_createv(clog, 0, NULL, NULL, 1776 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1777 CTLTYPE_INT, "log_interval", 1778 SYSCTL_DESCR("Minumum interval between logging " 1779 "unroutable packets"), 1780 NULL, 0, &ip6_log_interval, 0, 1781 CTL_NET, PF_INET6, IPPROTO_IPV6, 1782 IPV6CTL_LOG_INTERVAL, CTL_EOL); 1783 sysctl_createv(clog, 0, NULL, NULL, 1784 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1785 CTLTYPE_INT, "hdrnestlimit", 1786 SYSCTL_DESCR("Maximum number of nested IPv6 headers"), 1787 NULL, 0, &ip6_hdrnestlimit, 0, 1788 CTL_NET, PF_INET6, IPPROTO_IPV6, 1789 IPV6CTL_HDRNESTLIMIT, CTL_EOL); 1790 sysctl_createv(clog, 0, NULL, NULL, 1791 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1792 CTLTYPE_INT, "dad_count", 1793 SYSCTL_DESCR("Number of Duplicate Address Detection " 1794 "probes to send"), 1795 NULL, 0, &ip6_dad_count, 0, 1796 CTL_NET, PF_INET6, IPPROTO_IPV6, 1797 IPV6CTL_DAD_COUNT, CTL_EOL); 1798 sysctl_createv(clog, 0, NULL, NULL, 1799 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1800 CTLTYPE_INT, "auto_flowlabel", 1801 SYSCTL_DESCR("Assign random IPv6 flow labels"), 1802 NULL, 0, &ip6_auto_flowlabel, 0, 1803 CTL_NET, PF_INET6, IPPROTO_IPV6, 1804 IPV6CTL_AUTO_FLOWLABEL, CTL_EOL); 1805 sysctl_createv(clog, 0, NULL, NULL, 1806 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1807 CTLTYPE_INT, "defmcasthlim", 1808 SYSCTL_DESCR("Default multicast hop limit"), 1809 NULL, 0, &ip6_defmcasthlim, 0, 1810 CTL_NET, PF_INET6, IPPROTO_IPV6, 1811 IPV6CTL_DEFMCASTHLIM, CTL_EOL); 1812 #if NGIF > 0 1813 sysctl_createv(clog, 0, NULL, NULL, 1814 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1815 CTLTYPE_INT, "gifhlim", 1816 SYSCTL_DESCR("Default hop limit for a gif tunnel datagram"), 1817 NULL, 0, &ip6_gif_hlim, 0, 1818 CTL_NET, PF_INET6, IPPROTO_IPV6, 1819 IPV6CTL_GIF_HLIM, CTL_EOL); 1820 #endif /* NGIF */ 1821 sysctl_createv(clog, 0, NULL, NULL, 1822 CTLFLAG_PERMANENT, 1823 CTLTYPE_STRING, "kame_version", 1824 SYSCTL_DESCR("KAME Version"), 1825 NULL, 0, __UNCONST(__KAME_VERSION), 0, 1826 CTL_NET, PF_INET6, IPPROTO_IPV6, 1827 IPV6CTL_KAME_VERSION, CTL_EOL); 1828 sysctl_createv(clog, 0, NULL, NULL, 1829 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1830 CTLTYPE_INT, "use_deprecated", 1831 SYSCTL_DESCR("Allow use of deprecated addresses as " 1832 "source addresses"), 1833 NULL, 0, &ip6_use_deprecated, 0, 1834 CTL_NET, PF_INET6, IPPROTO_IPV6, 1835 IPV6CTL_USE_DEPRECATED, CTL_EOL); 1836 sysctl_createv(clog, 0, NULL, NULL, 1837 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1838 CTLTYPE_INT, "rr_prune", NULL, 1839 NULL, 0, &ip6_rr_prune, 0, 1840 CTL_NET, PF_INET6, IPPROTO_IPV6, 1841 IPV6CTL_RR_PRUNE, CTL_EOL); 1842 sysctl_createv(clog, 0, NULL, NULL, 1843 CTLFLAG_PERMANENT 1844 #ifndef INET6_BINDV6ONLY 1845 |CTLFLAG_READWRITE, 1846 #endif 1847 CTLTYPE_INT, "v6only", 1848 SYSCTL_DESCR("Disallow PF_INET6 sockets from connecting " 1849 "to PF_INET sockets"), 1850 NULL, 0, &ip6_v6only, 0, 1851 CTL_NET, PF_INET6, IPPROTO_IPV6, 1852 IPV6CTL_V6ONLY, CTL_EOL); 1853 sysctl_createv(clog, 0, NULL, NULL, 1854 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1855 CTLTYPE_INT, "anonportmin", 1856 SYSCTL_DESCR("Lowest ephemeral port number to assign"), 1857 sysctl_net_inet_ip_ports, 0, &ip6_anonportmin, 0, 1858 CTL_NET, PF_INET6, IPPROTO_IPV6, 1859 IPV6CTL_ANONPORTMIN, CTL_EOL); 1860 sysctl_createv(clog, 0, NULL, NULL, 1861 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1862 CTLTYPE_INT, "anonportmax", 1863 SYSCTL_DESCR("Highest ephemeral port number to assign"), 1864 sysctl_net_inet_ip_ports, 0, &ip6_anonportmax, 0, 1865 CTL_NET, PF_INET6, IPPROTO_IPV6, 1866 IPV6CTL_ANONPORTMAX, CTL_EOL); 1867 #ifndef IPNOPRIVPORTS 1868 sysctl_createv(clog, 0, NULL, NULL, 1869 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1870 CTLTYPE_INT, "lowportmin", 1871 SYSCTL_DESCR("Lowest privileged ephemeral port number " 1872 "to assign"), 1873 sysctl_net_inet_ip_ports, 0, &ip6_lowportmin, 0, 1874 CTL_NET, PF_INET6, IPPROTO_IPV6, 1875 IPV6CTL_LOWPORTMIN, CTL_EOL); 1876 sysctl_createv(clog, 0, NULL, NULL, 1877 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1878 CTLTYPE_INT, "lowportmax", 1879 SYSCTL_DESCR("Highest privileged ephemeral port number " 1880 "to assign"), 1881 sysctl_net_inet_ip_ports, 0, &ip6_lowportmax, 0, 1882 CTL_NET, PF_INET6, IPPROTO_IPV6, 1883 IPV6CTL_LOWPORTMAX, CTL_EOL); 1884 #endif /* IPNOPRIVPORTS */ 1885 sysctl_createv(clog, 0, NULL, NULL, 1886 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1887 CTLTYPE_INT, "use_tempaddr", 1888 SYSCTL_DESCR("Use temporary address"), 1889 NULL, 0, &ip6_use_tempaddr, 0, 1890 CTL_NET, PF_INET6, IPPROTO_IPV6, 1891 CTL_CREATE, CTL_EOL); 1892 sysctl_createv(clog, 0, NULL, NULL, 1893 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1894 CTLTYPE_INT, "temppltime", 1895 SYSCTL_DESCR("preferred lifetime of a temporary address"), 1896 NULL, 0, &ip6_temp_preferred_lifetime, 0, 1897 CTL_NET, PF_INET6, IPPROTO_IPV6, 1898 CTL_CREATE, CTL_EOL); 1899 sysctl_createv(clog, 0, NULL, NULL, 1900 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1901 CTLTYPE_INT, "tempvltime", 1902 SYSCTL_DESCR("valid lifetime of a temporary address"), 1903 NULL, 0, &ip6_temp_valid_lifetime, 0, 1904 CTL_NET, PF_INET6, IPPROTO_IPV6, 1905 CTL_CREATE, CTL_EOL); 1906 sysctl_createv(clog, 0, NULL, NULL, 1907 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1908 CTLTYPE_INT, "maxfrags", 1909 SYSCTL_DESCR("Maximum fragments in reassembly queue"), 1910 NULL, 0, &ip6_maxfrags, 0, 1911 CTL_NET, PF_INET6, IPPROTO_IPV6, 1912 IPV6CTL_MAXFRAGS, CTL_EOL); 1913 sysctl_createv(clog, 0, NULL, NULL, 1914 CTLFLAG_PERMANENT, 1915 CTLTYPE_STRUCT, "stats", 1916 SYSCTL_DESCR("IPv6 statistics"), 1917 sysctl_net_inet6_ip6_stats, 0, NULL, 0, 1918 CTL_NET, PF_INET6, IPPROTO_IPV6, 1919 IPV6CTL_STATS, CTL_EOL); 1920 sysctl_createv(clog, 0, NULL, NULL, 1921 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1922 CTLTYPE_INT, "use_defaultzone", 1923 SYSCTL_DESCR("Whether to use the default scope zones"), 1924 NULL, 0, &ip6_use_defzone, 0, 1925 CTL_NET, PF_INET6, IPPROTO_IPV6, 1926 IPV6CTL_USE_DEFAULTZONE, CTL_EOL); 1927 sysctl_createv(clog, 0, NULL, NULL, 1928 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1929 CTLTYPE_INT, "mcast_pmtu", 1930 SYSCTL_DESCR("Enable pMTU discovery for multicast packet"), 1931 NULL, 0, &ip6_mcast_pmtu, 0, 1932 CTL_NET, PF_INET6, IPPROTO_IPV6, 1933 CTL_CREATE, CTL_EOL); 1934 #ifdef GATEWAY 1935 sysctl_createv(clog, 0, NULL, NULL, 1936 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1937 CTLTYPE_INT, "maxflows", 1938 SYSCTL_DESCR("Number of flows for fast forwarding (IPv6)"), 1939 sysctl_net_inet6_ip6_maxflows, 0, &ip6_maxflows, 0, 1940 CTL_NET, PF_INET6, IPPROTO_IPV6, 1941 CTL_CREATE, CTL_EOL); 1942 sysctl_createv(clog, 0, NULL, NULL, 1943 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1944 CTLTYPE_INT, "hashsize", 1945 SYSCTL_DESCR("Size of hash table for fast forwarding (IPv6)"), 1946 sysctl_net_inet6_ip6_hashsize, 0, &ip6_hashsize, 0, 1947 CTL_NET, PF_INET6, IPPROTO_IPV6, 1948 CTL_CREATE, CTL_EOL); 1949 #endif 1950 /* anonportalgo RFC6056 subtree */ 1951 const struct sysctlnode *portalgo_node; 1952 sysctl_createv(clog, 0, NULL, &portalgo_node, 1953 CTLFLAG_PERMANENT, 1954 CTLTYPE_NODE, "anonportalgo", 1955 SYSCTL_DESCR("Anonymous port algorithm selection (RFC 6056)"), 1956 NULL, 0, NULL, 0, 1957 CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_CREATE, CTL_EOL); 1958 sysctl_createv(clog, 0, &portalgo_node, NULL, 1959 CTLFLAG_PERMANENT, 1960 CTLTYPE_STRING, "available", 1961 SYSCTL_DESCR("available algorithms"), 1962 sysctl_portalgo_available, 0, NULL, PORTALGO_MAXLEN, 1963 CTL_CREATE, CTL_EOL); 1964 sysctl_createv(clog, 0, &portalgo_node, NULL, 1965 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1966 CTLTYPE_STRING, "selected", 1967 SYSCTL_DESCR("selected algorithm"), 1968 sysctl_portalgo_selected6, 0, NULL, PORTALGO_MAXLEN, 1969 CTL_CREATE, CTL_EOL); 1970 sysctl_createv(clog, 0, &portalgo_node, NULL, 1971 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1972 CTLTYPE_STRUCT, "reserve", 1973 SYSCTL_DESCR("bitmap of reserved ports"), 1974 sysctl_portalgo_reserve6, 0, NULL, 0, 1975 CTL_CREATE, CTL_EOL); 1976 sysctl_createv(clog, 0, NULL, NULL, 1977 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1978 CTLTYPE_INT, "neighborgcthresh", 1979 SYSCTL_DESCR("Maximum number of entries in neighbor" 1980 " cache"), 1981 NULL, 1, &ip6_neighborgcthresh, 0, 1982 CTL_NET, PF_INET6, IPPROTO_IPV6, 1983 CTL_CREATE, CTL_EOL); 1984 sysctl_createv(clog, 0, NULL, NULL, 1985 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1986 CTLTYPE_INT, "maxifprefixes", 1987 SYSCTL_DESCR("Maximum number of prefixes created by" 1988 " route advertisement per interface"), 1989 NULL, 1, &ip6_maxifprefixes, 0, 1990 CTL_NET, PF_INET6, IPPROTO_IPV6, 1991 CTL_CREATE, CTL_EOL); 1992 sysctl_createv(clog, 0, NULL, NULL, 1993 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1994 CTLTYPE_INT, "maxifdefrouters", 1995 SYSCTL_DESCR("Maximum number of default routers created" 1996 " by route advertisement per interface"), 1997 NULL, 1, &ip6_maxifdefrouters, 0, 1998 CTL_NET, PF_INET6, IPPROTO_IPV6, 1999 CTL_CREATE, CTL_EOL); 2000 sysctl_createv(clog, 0, NULL, NULL, 2001 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 2002 CTLTYPE_INT, "maxdynroutes", 2003 SYSCTL_DESCR("Maximum number of routes created via" 2004 " redirect"), 2005 NULL, 1, &ip6_maxdynroutes, 0, 2006 CTL_NET, PF_INET6, IPPROTO_IPV6, 2007 CTL_CREATE, CTL_EOL); 2008 } 2009 2010 void 2011 ip6_statinc(u_int stat) 2012 { 2013 2014 KASSERT(stat < IP6_NSTATS); 2015 IP6_STATINC(stat); 2016 } 2017