1 /* $NetBSD: ip6_input.c,v 1.151 2015/04/01 02:49:44 ozaki-r 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 1.151 2015/04/01 02:49:44 ozaki-r Exp $"); 66 67 #include "opt_gateway.h" 68 #include "opt_inet.h" 69 #include "opt_inet6.h" 70 #include "opt_ipsec.h" 71 #include "opt_compat_netbsd.h" 72 73 #include <sys/param.h> 74 #include <sys/systm.h> 75 #include <sys/malloc.h> 76 #include <sys/mbuf.h> 77 #include <sys/domain.h> 78 #include <sys/protosw.h> 79 #include <sys/socket.h> 80 #include <sys/socketvar.h> 81 #include <sys/errno.h> 82 #include <sys/time.h> 83 #include <sys/kernel.h> 84 #include <sys/syslog.h> 85 #include <sys/proc.h> 86 #include <sys/sysctl.h> 87 #include <sys/cprng.h> 88 89 #include <net/if.h> 90 #include <net/if_types.h> 91 #include <net/if_dl.h> 92 #include <net/route.h> 93 #include <net/pktqueue.h> 94 #include <net/pfil.h> 95 96 #include <netinet/in.h> 97 #include <netinet/in_systm.h> 98 #ifdef INET 99 #include <netinet/ip.h> 100 #include <netinet/ip_var.h> 101 #include <netinet/ip_icmp.h> 102 #endif /* INET */ 103 #include <netinet/ip6.h> 104 #include <netinet/portalgo.h> 105 #include <netinet6/in6_var.h> 106 #include <netinet6/ip6_var.h> 107 #include <netinet6/ip6_private.h> 108 #include <netinet6/in6_pcb.h> 109 #include <netinet/icmp6.h> 110 #include <netinet6/scope6_var.h> 111 #include <netinet6/in6_ifattach.h> 112 #include <netinet6/nd6.h> 113 114 #ifdef IPSEC 115 #include <netipsec/ipsec.h> 116 #include <netipsec/ipsec6.h> 117 #include <netipsec/key.h> 118 #endif /* IPSEC */ 119 120 #ifdef COMPAT_50 121 #include <compat/sys/time.h> 122 #include <compat/sys/socket.h> 123 #endif 124 125 #include <netinet6/ip6protosw.h> 126 127 #include "faith.h" 128 #include "gif.h" 129 130 #if NGIF > 0 131 #include <netinet6/in6_gif.h> 132 #endif 133 134 #include <net/net_osdep.h> 135 136 extern struct domain inet6domain; 137 138 u_char ip6_protox[IPPROTO_MAX]; 139 struct in6_ifaddr *in6_ifaddr; 140 pktqueue_t *ip6_pktq __read_mostly; 141 142 extern callout_t in6_tmpaddrtimer_ch; 143 144 int ip6_forward_srcrt; /* XXX */ 145 int ip6_sourcecheck; /* XXX */ 146 int ip6_sourcecheck_interval; /* XXX */ 147 148 pfil_head_t *inet6_pfil_hook; 149 150 percpu_t *ip6stat_percpu; 151 152 static void ip6_init2(void *); 153 static void ip6intr(void *); 154 static struct m_tag *ip6_setdstifaddr(struct mbuf *, const struct in6_ifaddr *); 155 156 static int ip6_process_hopopts(struct mbuf *, u_int8_t *, int, u_int32_t *, 157 u_int32_t *); 158 static struct mbuf *ip6_pullexthdr(struct mbuf *, size_t, int); 159 static void sysctl_net_inet6_ip6_setup(struct sysctllog **); 160 161 /* 162 * IP6 initialization: fill in IP6 protocol switch table. 163 * All protocols not implemented in kernel go to raw IP6 protocol handler. 164 */ 165 void 166 ip6_init(void) 167 { 168 const struct ip6protosw *pr; 169 int i; 170 171 sysctl_net_inet6_ip6_setup(NULL); 172 pr = (const struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 173 if (pr == 0) 174 panic("ip6_init"); 175 for (i = 0; i < IPPROTO_MAX; i++) 176 ip6_protox[i] = pr - inet6sw; 177 for (pr = (const struct ip6protosw *)inet6domain.dom_protosw; 178 pr < (const struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++) 179 if (pr->pr_domain->dom_family == PF_INET6 && 180 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) 181 ip6_protox[pr->pr_protocol] = pr - inet6sw; 182 183 ip6_pktq = pktq_create(IFQ_MAXLEN, ip6intr, NULL); 184 KASSERT(ip6_pktq != NULL); 185 186 scope6_init(); 187 addrsel_policy_init(); 188 nd6_init(); 189 frag6_init(); 190 ip6_desync_factor = cprng_fast32() % MAX_TEMP_DESYNC_FACTOR; 191 192 ip6_init2(NULL); 193 #ifdef GATEWAY 194 ip6flow_init(ip6_hashsize); 195 #endif 196 /* Register our Packet Filter hook. */ 197 inet6_pfil_hook = pfil_head_create(PFIL_TYPE_AF, (void *)AF_INET6); 198 KASSERT(inet6_pfil_hook != NULL); 199 200 ip6stat_percpu = percpu_alloc(sizeof(uint64_t) * IP6_NSTATS); 201 } 202 203 static void 204 ip6_init2(void *dummy) 205 { 206 207 /* nd6_timer_init */ 208 callout_init(&nd6_timer_ch, CALLOUT_MPSAFE); 209 callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL); 210 211 /* timer for regeneranation of temporary addresses randomize ID */ 212 callout_init(&in6_tmpaddrtimer_ch, CALLOUT_MPSAFE); 213 callout_reset(&in6_tmpaddrtimer_ch, 214 (ip6_temp_preferred_lifetime - ip6_desync_factor - 215 ip6_temp_regen_advance) * hz, 216 in6_tmpaddrtimer, NULL); 217 } 218 219 /* 220 * IP6 input interrupt handling. Just pass the packet to ip6_input. 221 */ 222 static void 223 ip6intr(void *arg __unused) 224 { 225 struct mbuf *m; 226 227 mutex_enter(softnet_lock); 228 while ((m = pktq_dequeue(ip6_pktq)) != NULL) { 229 const ifnet_t *ifp = m->m_pkthdr.rcvif; 230 231 /* 232 * Drop the packet if IPv6 is disabled on the interface. 233 */ 234 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)) { 235 m_freem(m); 236 continue; 237 } 238 ip6_input(m); 239 } 240 mutex_exit(softnet_lock); 241 } 242 243 extern struct route ip6_forward_rt; 244 245 void 246 ip6_input(struct mbuf *m) 247 { 248 struct ip6_hdr *ip6; 249 int hit, off = sizeof(struct ip6_hdr), nest; 250 u_int32_t plen; 251 u_int32_t rtalert = ~0; 252 int nxt, ours = 0, rh_present = 0; 253 struct ifnet *deliverifp = NULL; 254 int srcrt = 0; 255 const struct rtentry *rt; 256 union { 257 struct sockaddr dst; 258 struct sockaddr_in6 dst6; 259 } u; 260 261 /* 262 * make sure we don't have onion peering information into m_tag. 263 */ 264 ip6_delaux(m); 265 266 /* 267 * mbuf statistics 268 */ 269 if (m->m_flags & M_EXT) { 270 if (m->m_next) 271 IP6_STATINC(IP6_STAT_MEXT2M); 272 else 273 IP6_STATINC(IP6_STAT_MEXT1); 274 } else { 275 #define M2MMAX 32 276 if (m->m_next) { 277 if (m->m_flags & M_LOOP) { 278 /*XXX*/ IP6_STATINC(IP6_STAT_M2M + lo0ifp->if_index); 279 } else if (m->m_pkthdr.rcvif->if_index < M2MMAX) { 280 IP6_STATINC(IP6_STAT_M2M + 281 m->m_pkthdr.rcvif->if_index); 282 } else 283 IP6_STATINC(IP6_STAT_M2M); 284 } else 285 IP6_STATINC(IP6_STAT_M1); 286 #undef M2MMAX 287 } 288 289 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive); 290 IP6_STATINC(IP6_STAT_TOTAL); 291 292 /* 293 * If the IPv6 header is not aligned, slurp it up into a new 294 * mbuf with space for link headers, in the event we forward 295 * it. Otherwise, if it is aligned, make sure the entire base 296 * IPv6 header is in the first mbuf of the chain. 297 */ 298 if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 299 struct ifnet *inifp = m->m_pkthdr.rcvif; 300 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 301 (max_linkhdr + 3) & ~3)) == NULL) { 302 /* XXXJRT new stat, please */ 303 IP6_STATINC(IP6_STAT_TOOSMALL); 304 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 305 return; 306 } 307 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 308 struct ifnet *inifp = m->m_pkthdr.rcvif; 309 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 310 IP6_STATINC(IP6_STAT_TOOSMALL); 311 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 312 return; 313 } 314 } 315 316 ip6 = mtod(m, struct ip6_hdr *); 317 318 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 319 IP6_STATINC(IP6_STAT_BADVERS); 320 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 321 goto bad; 322 } 323 324 /* 325 * Assume that we can create a fast-forward IP flow entry 326 * based on this packet. 327 */ 328 m->m_flags |= M_CANFASTFWD; 329 330 /* 331 * Run through list of hooks for input packets. If there are any 332 * filters which require that additional packets in the flow are 333 * not fast-forwarded, they must clear the M_CANFASTFWD flag. 334 * Note that filters must _never_ set this flag, as another filter 335 * in the list may have previously cleared it. 336 */ 337 /* 338 * let ipfilter look at packet on the wire, 339 * not the decapsulated packet. 340 */ 341 #if defined(IPSEC) 342 if (!ipsec_used || !ipsec_indone(m)) 343 #else 344 if (1) 345 #endif 346 { 347 struct in6_addr odst; 348 349 odst = ip6->ip6_dst; 350 if (pfil_run_hooks(inet6_pfil_hook, &m, m->m_pkthdr.rcvif, 351 PFIL_IN) != 0) 352 return; 353 if (m == NULL) 354 return; 355 ip6 = mtod(m, struct ip6_hdr *); 356 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst); 357 } 358 359 IP6_STATINC(IP6_STAT_NXTHIST + ip6->ip6_nxt); 360 361 #ifdef ALTQ 362 if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) { 363 /* packet is dropped by traffic conditioner */ 364 return; 365 } 366 #endif 367 368 /* 369 * Check against address spoofing/corruption. 370 */ 371 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) || 372 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) { 373 /* 374 * XXX: "badscope" is not very suitable for a multicast source. 375 */ 376 IP6_STATINC(IP6_STAT_BADSCOPE); 377 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 378 goto bad; 379 } 380 /* 381 * The following check is not documented in specs. A malicious 382 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack 383 * and bypass security checks (act as if it was from 127.0.0.1 by using 384 * IPv6 src ::ffff:127.0.0.1). Be cautious. 385 * 386 * This check chokes if we are in an SIIT cloud. As none of BSDs 387 * support IPv4-less kernel compilation, we cannot support SIIT 388 * environment at all. So, it makes more sense for us to reject any 389 * malicious packets for non-SIIT environment, than try to do a 390 * partial support for SIIT environment. 391 */ 392 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 393 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 394 IP6_STATINC(IP6_STAT_BADSCOPE); 395 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 396 goto bad; 397 } 398 #if 0 399 /* 400 * Reject packets with IPv4 compatible addresses (auto tunnel). 401 * 402 * The code forbids auto tunnel relay case in RFC1933 (the check is 403 * stronger than RFC1933). We may want to re-enable it if mech-xx 404 * is revised to forbid relaying case. 405 */ 406 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) || 407 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) { 408 IP6_STATINC(IP6_STAT_BADSCOPE); 409 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 410 goto bad; 411 } 412 #endif 413 414 /* 415 * Disambiguate address scope zones (if there is ambiguity). 416 * We first make sure that the original source or destination address 417 * is not in our internal form for scoped addresses. Such addresses 418 * are not necessarily invalid spec-wise, but we cannot accept them due 419 * to the usage conflict. 420 * in6_setscope() then also checks and rejects the cases where src or 421 * dst are the loopback address and the receiving interface 422 * is not loopback. 423 */ 424 if (__predict_false( 425 m_makewritable(&m, 0, sizeof(struct ip6_hdr), M_DONTWAIT))) 426 goto bad; 427 ip6 = mtod(m, struct ip6_hdr *); 428 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) { 429 IP6_STATINC(IP6_STAT_BADSCOPE); /* XXX */ 430 goto bad; 431 } 432 if (in6_setscope(&ip6->ip6_src, m->m_pkthdr.rcvif, NULL) || 433 in6_setscope(&ip6->ip6_dst, m->m_pkthdr.rcvif, NULL)) { 434 IP6_STATINC(IP6_STAT_BADSCOPE); 435 goto bad; 436 } 437 438 /* 439 * Multicast check 440 */ 441 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 442 struct in6_multi *in6m = 0; 443 444 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast); 445 /* 446 * See if we belong to the destination multicast group on the 447 * arrival interface. 448 */ 449 IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m); 450 if (in6m) 451 ours = 1; 452 else if (!ip6_mrouter) { 453 uint64_t *ip6s = IP6_STAT_GETREF(); 454 ip6s[IP6_STAT_NOTMEMBER]++; 455 ip6s[IP6_STAT_CANTFORWARD]++; 456 IP6_STAT_PUTREF(); 457 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 458 goto bad; 459 } 460 deliverifp = m->m_pkthdr.rcvif; 461 goto hbhcheck; 462 } 463 464 sockaddr_in6_init(&u.dst6, &ip6->ip6_dst, 0, 0, 0); 465 466 /* 467 * Unicast check 468 */ 469 rt = rtcache_lookup2(&ip6_forward_rt, &u.dst, 1, &hit); 470 if (hit) 471 IP6_STATINC(IP6_STAT_FORWARD_CACHEHIT); 472 else 473 IP6_STATINC(IP6_STAT_FORWARD_CACHEMISS); 474 475 #define rt6_getkey(__rt) satocsin6(rt_getkey(__rt)) 476 477 /* 478 * Accept the packet if the forwarding interface to the destination 479 * according to the routing table is the loopback interface, 480 * unless the associated route has a gateway. 481 * Note that this approach causes to accept a packet if there is a 482 * route to the loopback interface for the destination of the packet. 483 * But we think it's even useful in some situations, e.g. when using 484 * a special daemon which wants to intercept the packet. 485 */ 486 if (rt != NULL && 487 (rt->rt_flags & (RTF_HOST|RTF_GATEWAY)) == RTF_HOST && 488 !(rt->rt_flags & RTF_CLONED) && 489 #if 0 490 /* 491 * The check below is redundant since the comparison of 492 * the destination and the key of the rtentry has 493 * already done through looking up the routing table. 494 */ 495 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &rt6_getkey(rt)->sin6_addr) && 496 #endif 497 rt->rt_ifp->if_type == IFT_LOOP) { 498 struct in6_ifaddr *ia6 = (struct in6_ifaddr *)rt->rt_ifa; 499 if (ia6->ia6_flags & IN6_IFF_ANYCAST) 500 m->m_flags |= M_ANYCAST6; 501 /* 502 * packets to a tentative, duplicated, or somehow invalid 503 * address must not be accepted. 504 */ 505 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) { 506 /* this address is ready */ 507 ours = 1; 508 deliverifp = ia6->ia_ifp; /* correct? */ 509 goto hbhcheck; 510 } else { 511 /* address is not ready, so discard the packet. */ 512 nd6log((LOG_INFO, 513 "ip6_input: packet to an unready address %s->%s\n", 514 ip6_sprintf(&ip6->ip6_src), 515 ip6_sprintf(&ip6->ip6_dst))); 516 517 goto bad; 518 } 519 } 520 521 /* 522 * FAITH (Firewall Aided Internet Translator) 523 */ 524 #if defined(NFAITH) && 0 < NFAITH 525 if (ip6_keepfaith) { 526 if (rt != NULL && rt->rt_ifp != NULL && 527 rt->rt_ifp->if_type == IFT_FAITH) { 528 /* XXX do we need more sanity checks? */ 529 ours = 1; 530 deliverifp = rt->rt_ifp; /* faith */ 531 goto hbhcheck; 532 } 533 } 534 #endif 535 536 #if 0 537 { 538 /* 539 * Last resort: check in6_ifaddr for incoming interface. 540 * The code is here until I update the "goto ours hack" code above 541 * working right. 542 */ 543 struct ifaddr *ifa; 544 IFADDR_FOREACH(ifa, m->m_pkthdr.rcvif) { 545 if (ifa->ifa_addr == NULL) 546 continue; /* just for safety */ 547 if (ifa->ifa_addr->sa_family != AF_INET6) 548 continue; 549 if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) { 550 ours = 1; 551 deliverifp = ifa->ifa_ifp; 552 goto hbhcheck; 553 } 554 } 555 } 556 #endif 557 558 /* 559 * Now there is no reason to process the packet if it's not our own 560 * and we're not a router. 561 */ 562 if (!ip6_forwarding) { 563 IP6_STATINC(IP6_STAT_CANTFORWARD); 564 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 565 goto bad; 566 } 567 568 hbhcheck: 569 /* 570 * record address information into m_tag, if we don't have one yet. 571 * note that we are unable to record it, if the address is not listed 572 * as our interface address (e.g. multicast addresses, addresses 573 * within FAITH prefixes and such). 574 */ 575 if (deliverifp && ip6_getdstifaddr(m) == NULL) { 576 struct in6_ifaddr *ia6; 577 578 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 579 if (ia6 != NULL && ip6_setdstifaddr(m, ia6) == NULL) { 580 /* 581 * XXX maybe we should drop the packet here, 582 * as we could not provide enough information 583 * to the upper layers. 584 */ 585 } 586 } 587 588 /* 589 * Process Hop-by-Hop options header if it's contained. 590 * m may be modified in ip6_hopopts_input(). 591 * If a JumboPayload option is included, plen will also be modified. 592 */ 593 plen = (u_int32_t)ntohs(ip6->ip6_plen); 594 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 595 struct ip6_hbh *hbh; 596 597 if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) { 598 #if 0 /*touches NULL pointer*/ 599 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 600 #endif 601 return; /* m have already been freed */ 602 } 603 604 /* adjust pointer */ 605 ip6 = mtod(m, struct ip6_hdr *); 606 607 /* 608 * if the payload length field is 0 and the next header field 609 * indicates Hop-by-Hop Options header, then a Jumbo Payload 610 * option MUST be included. 611 */ 612 if (ip6->ip6_plen == 0 && plen == 0) { 613 /* 614 * Note that if a valid jumbo payload option is 615 * contained, ip6_hopopts_input() must set a valid 616 * (non-zero) payload length to the variable plen. 617 */ 618 IP6_STATINC(IP6_STAT_BADOPTIONS); 619 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 620 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 621 icmp6_error(m, ICMP6_PARAM_PROB, 622 ICMP6_PARAMPROB_HEADER, 623 (char *)&ip6->ip6_plen - (char *)ip6); 624 return; 625 } 626 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 627 sizeof(struct ip6_hbh)); 628 if (hbh == NULL) { 629 IP6_STATINC(IP6_STAT_TOOSHORT); 630 return; 631 } 632 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 633 nxt = hbh->ip6h_nxt; 634 635 /* 636 * accept the packet if a router alert option is included 637 * and we act as an IPv6 router. 638 */ 639 if (rtalert != ~0 && ip6_forwarding) 640 ours = 1; 641 } else 642 nxt = ip6->ip6_nxt; 643 644 /* 645 * Check that the amount of data in the buffers 646 * is as at least much as the IPv6 header would have us expect. 647 * Trim mbufs if longer than we expect. 648 * Drop packet if shorter than we expect. 649 */ 650 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 651 IP6_STATINC(IP6_STAT_TOOSHORT); 652 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 653 goto bad; 654 } 655 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 656 if (m->m_len == m->m_pkthdr.len) { 657 m->m_len = sizeof(struct ip6_hdr) + plen; 658 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 659 } else 660 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 661 } 662 663 /* 664 * Forward if desirable. 665 */ 666 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 667 /* 668 * If we are acting as a multicast router, all 669 * incoming multicast packets are passed to the 670 * kernel-level multicast forwarding function. 671 * The packet is returned (relatively) intact; if 672 * ip6_mforward() returns a non-zero value, the packet 673 * must be discarded, else it may be accepted below. 674 */ 675 if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) { 676 IP6_STATINC(IP6_STAT_CANTFORWARD); 677 m_freem(m); 678 return; 679 } 680 if (!ours) { 681 m_freem(m); 682 return; 683 } 684 } else if (!ours) { 685 ip6_forward(m, srcrt); 686 return; 687 } 688 689 ip6 = mtod(m, struct ip6_hdr *); 690 691 /* 692 * Malicious party may be able to use IPv4 mapped addr to confuse 693 * tcp/udp stack and bypass security checks (act as if it was from 694 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious. 695 * 696 * For SIIT end node behavior, you may want to disable the check. 697 * However, you will become vulnerable to attacks using IPv4 mapped 698 * source. 699 */ 700 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 701 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 702 IP6_STATINC(IP6_STAT_BADSCOPE); 703 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 704 goto bad; 705 } 706 707 /* 708 * Tell launch routine the next header 709 */ 710 #ifdef IFA_STATS 711 if (deliverifp != NULL) { 712 struct in6_ifaddr *ia6; 713 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 714 if (ia6) 715 ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len; 716 } 717 #endif 718 IP6_STATINC(IP6_STAT_DELIVERED); 719 in6_ifstat_inc(deliverifp, ifs6_in_deliver); 720 nest = 0; 721 722 rh_present = 0; 723 while (nxt != IPPROTO_DONE) { 724 if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) { 725 IP6_STATINC(IP6_STAT_TOOMANYHDR); 726 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 727 goto bad; 728 } 729 730 /* 731 * protection against faulty packet - there should be 732 * more sanity checks in header chain processing. 733 */ 734 if (m->m_pkthdr.len < off) { 735 IP6_STATINC(IP6_STAT_TOOSHORT); 736 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 737 goto bad; 738 } 739 740 if (nxt == IPPROTO_ROUTING) { 741 if (rh_present++) { 742 in6_ifstat_inc(m->m_pkthdr.rcvif, 743 ifs6_in_hdrerr); 744 IP6_STATINC(IP6_STAT_BADOPTIONS); 745 goto bad; 746 } 747 } 748 749 #ifdef IPSEC 750 if (ipsec_used) { 751 /* 752 * enforce IPsec policy checking if we are seeing last 753 * header. note that we do not visit this with 754 * protocols with pcb layer code - like udp/tcp/raw ip. 755 */ 756 if ((inet6sw[ip_protox[nxt]].pr_flags 757 & PR_LASTHDR) != 0) { 758 int error = ipsec6_input(m); 759 if (error) 760 goto bad; 761 } 762 } 763 #endif /* IPSEC */ 764 765 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt); 766 } 767 return; 768 bad: 769 m_freem(m); 770 } 771 772 /* 773 * set/grab in6_ifaddr correspond to IPv6 destination address. 774 */ 775 static struct m_tag * 776 ip6_setdstifaddr(struct mbuf *m, const struct in6_ifaddr *ia) 777 { 778 struct m_tag *mtag; 779 struct ip6aux *ip6a; 780 781 mtag = ip6_addaux(m); 782 if (mtag == NULL) 783 return NULL; 784 785 ip6a = (struct ip6aux *)(mtag + 1); 786 if (in6_setscope(&ip6a->ip6a_src, ia->ia_ifp, &ip6a->ip6a_scope_id)) { 787 IP6_STATINC(IP6_STAT_BADSCOPE); 788 return NULL; 789 } 790 791 ip6a->ip6a_src = ia->ia_addr.sin6_addr; 792 ip6a->ip6a_flags = ia->ia6_flags; 793 return mtag; 794 } 795 796 const struct ip6aux * 797 ip6_getdstifaddr(struct mbuf *m) 798 { 799 struct m_tag *mtag; 800 801 mtag = ip6_findaux(m); 802 if (mtag != NULL) 803 return (struct ip6aux *)(mtag + 1); 804 else 805 return NULL; 806 } 807 808 /* 809 * Hop-by-Hop options header processing. If a valid jumbo payload option is 810 * included, the real payload length will be stored in plenp. 811 * 812 * rtalertp - XXX: should be stored more smart way 813 */ 814 int 815 ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp, 816 struct mbuf **mp, int *offp) 817 { 818 struct mbuf *m = *mp; 819 int off = *offp, hbhlen; 820 struct ip6_hbh *hbh; 821 822 /* validation of the length of the header */ 823 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, 824 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh)); 825 if (hbh == NULL) { 826 IP6_STATINC(IP6_STAT_TOOSHORT); 827 return -1; 828 } 829 hbhlen = (hbh->ip6h_len + 1) << 3; 830 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 831 hbhlen); 832 if (hbh == NULL) { 833 IP6_STATINC(IP6_STAT_TOOSHORT); 834 return -1; 835 } 836 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 837 off += hbhlen; 838 hbhlen -= sizeof(struct ip6_hbh); 839 840 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 841 hbhlen, rtalertp, plenp) < 0) 842 return (-1); 843 844 *offp = off; 845 *mp = m; 846 return (0); 847 } 848 849 /* 850 * Search header for all Hop-by-hop options and process each option. 851 * This function is separate from ip6_hopopts_input() in order to 852 * handle a case where the sending node itself process its hop-by-hop 853 * options header. In such a case, the function is called from ip6_output(). 854 * 855 * The function assumes that hbh header is located right after the IPv6 header 856 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to 857 * opthead + hbhlen is located in continuous memory region. 858 */ 859 static int 860 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen, 861 u_int32_t *rtalertp, u_int32_t *plenp) 862 { 863 struct ip6_hdr *ip6; 864 int optlen = 0; 865 u_int8_t *opt = opthead; 866 u_int16_t rtalert_val; 867 u_int32_t jumboplen; 868 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh); 869 870 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 871 switch (*opt) { 872 case IP6OPT_PAD1: 873 optlen = 1; 874 break; 875 case IP6OPT_PADN: 876 if (hbhlen < IP6OPT_MINLEN) { 877 IP6_STATINC(IP6_STAT_TOOSMALL); 878 goto bad; 879 } 880 optlen = *(opt + 1) + 2; 881 break; 882 case IP6OPT_RTALERT: 883 /* XXX may need check for alignment */ 884 if (hbhlen < IP6OPT_RTALERT_LEN) { 885 IP6_STATINC(IP6_STAT_TOOSMALL); 886 goto bad; 887 } 888 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) { 889 /* XXX stat */ 890 icmp6_error(m, ICMP6_PARAM_PROB, 891 ICMP6_PARAMPROB_HEADER, 892 erroff + opt + 1 - opthead); 893 return (-1); 894 } 895 optlen = IP6OPT_RTALERT_LEN; 896 memcpy((void *)&rtalert_val, (void *)(opt + 2), 2); 897 *rtalertp = ntohs(rtalert_val); 898 break; 899 case IP6OPT_JUMBO: 900 /* XXX may need check for alignment */ 901 if (hbhlen < IP6OPT_JUMBO_LEN) { 902 IP6_STATINC(IP6_STAT_TOOSMALL); 903 goto bad; 904 } 905 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) { 906 /* XXX stat */ 907 icmp6_error(m, ICMP6_PARAM_PROB, 908 ICMP6_PARAMPROB_HEADER, 909 erroff + opt + 1 - opthead); 910 return (-1); 911 } 912 optlen = IP6OPT_JUMBO_LEN; 913 914 /* 915 * IPv6 packets that have non 0 payload length 916 * must not contain a jumbo payload option. 917 */ 918 ip6 = mtod(m, struct ip6_hdr *); 919 if (ip6->ip6_plen) { 920 IP6_STATINC(IP6_STAT_BADOPTIONS); 921 icmp6_error(m, ICMP6_PARAM_PROB, 922 ICMP6_PARAMPROB_HEADER, 923 erroff + opt - opthead); 924 return (-1); 925 } 926 927 /* 928 * We may see jumbolen in unaligned location, so 929 * we'd need to perform bcopy(). 930 */ 931 memcpy(&jumboplen, opt + 2, sizeof(jumboplen)); 932 jumboplen = (u_int32_t)htonl(jumboplen); 933 934 #if 1 935 /* 936 * if there are multiple jumbo payload options, 937 * *plenp will be non-zero and the packet will be 938 * rejected. 939 * the behavior may need some debate in ipngwg - 940 * multiple options does not make sense, however, 941 * there's no explicit mention in specification. 942 */ 943 if (*plenp != 0) { 944 IP6_STATINC(IP6_STAT_BADOPTIONS); 945 icmp6_error(m, ICMP6_PARAM_PROB, 946 ICMP6_PARAMPROB_HEADER, 947 erroff + opt + 2 - opthead); 948 return (-1); 949 } 950 #endif 951 952 /* 953 * jumbo payload length must be larger than 65535. 954 */ 955 if (jumboplen <= IPV6_MAXPACKET) { 956 IP6_STATINC(IP6_STAT_BADOPTIONS); 957 icmp6_error(m, ICMP6_PARAM_PROB, 958 ICMP6_PARAMPROB_HEADER, 959 erroff + opt + 2 - opthead); 960 return (-1); 961 } 962 *plenp = jumboplen; 963 964 break; 965 default: /* unknown option */ 966 if (hbhlen < IP6OPT_MINLEN) { 967 IP6_STATINC(IP6_STAT_TOOSMALL); 968 goto bad; 969 } 970 optlen = ip6_unknown_opt(opt, m, 971 erroff + opt - opthead); 972 if (optlen == -1) 973 return (-1); 974 optlen += 2; 975 break; 976 } 977 } 978 979 return (0); 980 981 bad: 982 m_freem(m); 983 return (-1); 984 } 985 986 /* 987 * Unknown option processing. 988 * The third argument `off' is the offset from the IPv6 header to the option, 989 * which is necessary if the IPv6 header the and option header and IPv6 header 990 * is not continuous in order to return an ICMPv6 error. 991 */ 992 int 993 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off) 994 { 995 struct ip6_hdr *ip6; 996 997 switch (IP6OPT_TYPE(*optp)) { 998 case IP6OPT_TYPE_SKIP: /* ignore the option */ 999 return ((int)*(optp + 1)); 1000 case IP6OPT_TYPE_DISCARD: /* silently discard */ 1001 m_freem(m); 1002 return (-1); 1003 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 1004 IP6_STATINC(IP6_STAT_BADOPTIONS); 1005 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 1006 return (-1); 1007 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 1008 IP6_STATINC(IP6_STAT_BADOPTIONS); 1009 ip6 = mtod(m, struct ip6_hdr *); 1010 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 1011 (m->m_flags & (M_BCAST|M_MCAST))) 1012 m_freem(m); 1013 else 1014 icmp6_error(m, ICMP6_PARAM_PROB, 1015 ICMP6_PARAMPROB_OPTION, off); 1016 return (-1); 1017 } 1018 1019 m_freem(m); /* XXX: NOTREACHED */ 1020 return (-1); 1021 } 1022 1023 /* 1024 * Create the "control" list for this pcb. 1025 * 1026 * The routine will be called from upper layer handlers like tcp6_input(). 1027 * Thus the routine assumes that the caller (tcp6_input) have already 1028 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the 1029 * very first mbuf on the mbuf chain. 1030 * We may want to add some infinite loop prevention or sanity checks for safety. 1031 * (This applies only when you are using KAME mbuf chain restriction, i.e. 1032 * you are using IP6_EXTHDR_CHECK() not m_pulldown()) 1033 */ 1034 void 1035 ip6_savecontrol(struct in6pcb *in6p, struct mbuf **mp, 1036 struct ip6_hdr *ip6, struct mbuf *m) 1037 { 1038 #ifdef RFC2292 1039 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y)) 1040 #else 1041 #define IS2292(x, y) (y) 1042 #endif 1043 1044 if (in6p->in6p_socket->so_options & SO_TIMESTAMP 1045 #ifdef SO_OTIMESTAMP 1046 || in6p->in6p_socket->so_options & SO_OTIMESTAMP 1047 #endif 1048 ) { 1049 struct timeval tv; 1050 1051 microtime(&tv); 1052 #ifdef SO_OTIMESTAMP 1053 if (in6p->in6p_socket->so_options & SO_OTIMESTAMP) { 1054 struct timeval50 tv50; 1055 timeval_to_timeval50(&tv, &tv50); 1056 *mp = sbcreatecontrol((void *) &tv50, sizeof(tv50), 1057 SCM_OTIMESTAMP, SOL_SOCKET); 1058 } else 1059 #endif 1060 *mp = sbcreatecontrol((void *) &tv, sizeof(tv), 1061 SCM_TIMESTAMP, SOL_SOCKET); 1062 if (*mp) 1063 mp = &(*mp)->m_next; 1064 } 1065 1066 /* some OSes call this logic with IPv4 packet, for SO_TIMESTAMP */ 1067 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) 1068 return; 1069 1070 /* RFC 2292 sec. 5 */ 1071 if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) { 1072 struct in6_pktinfo pi6; 1073 1074 memcpy(&pi6.ipi6_addr, &ip6->ip6_dst, sizeof(struct in6_addr)); 1075 in6_clearscope(&pi6.ipi6_addr); /* XXX */ 1076 pi6.ipi6_ifindex = m->m_pkthdr.rcvif ? 1077 m->m_pkthdr.rcvif->if_index : 0; 1078 *mp = sbcreatecontrol((void *) &pi6, 1079 sizeof(struct in6_pktinfo), 1080 IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6); 1081 if (*mp) 1082 mp = &(*mp)->m_next; 1083 } 1084 1085 if (in6p->in6p_flags & IN6P_HOPLIMIT) { 1086 int hlim = ip6->ip6_hlim & 0xff; 1087 1088 *mp = sbcreatecontrol((void *) &hlim, sizeof(int), 1089 IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6); 1090 if (*mp) 1091 mp = &(*mp)->m_next; 1092 } 1093 1094 if ((in6p->in6p_flags & IN6P_TCLASS) != 0) { 1095 u_int32_t flowinfo; 1096 int tclass; 1097 1098 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK); 1099 flowinfo >>= 20; 1100 1101 tclass = flowinfo & 0xff; 1102 *mp = sbcreatecontrol((void *)&tclass, sizeof(tclass), 1103 IPV6_TCLASS, IPPROTO_IPV6); 1104 1105 if (*mp) 1106 mp = &(*mp)->m_next; 1107 } 1108 1109 /* 1110 * IPV6_HOPOPTS socket option. Recall that we required super-user 1111 * privilege for the option (see ip6_ctloutput), but it might be too 1112 * strict, since there might be some hop-by-hop options which can be 1113 * returned to normal user. 1114 * See also RFC3542 section 8 (or RFC2292 section 6). 1115 */ 1116 if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0) { 1117 /* 1118 * Check if a hop-by-hop options header is contatined in the 1119 * received packet, and if so, store the options as ancillary 1120 * data. Note that a hop-by-hop options header must be 1121 * just after the IPv6 header, which fact is assured through 1122 * the IPv6 input processing. 1123 */ 1124 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1125 if (xip6->ip6_nxt == IPPROTO_HOPOPTS) { 1126 struct ip6_hbh *hbh; 1127 int hbhlen; 1128 struct mbuf *ext; 1129 1130 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr), 1131 xip6->ip6_nxt); 1132 if (ext == NULL) { 1133 IP6_STATINC(IP6_STAT_TOOSHORT); 1134 return; 1135 } 1136 hbh = mtod(ext, struct ip6_hbh *); 1137 hbhlen = (hbh->ip6h_len + 1) << 3; 1138 if (hbhlen != ext->m_len) { 1139 m_freem(ext); 1140 IP6_STATINC(IP6_STAT_TOOSHORT); 1141 return; 1142 } 1143 1144 /* 1145 * XXX: We copy whole the header even if a jumbo 1146 * payload option is included, which option is to 1147 * be removed before returning in the RFC 2292. 1148 * Note: this constraint is removed in RFC3542. 1149 */ 1150 *mp = sbcreatecontrol((void *)hbh, hbhlen, 1151 IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS), 1152 IPPROTO_IPV6); 1153 if (*mp) 1154 mp = &(*mp)->m_next; 1155 m_freem(ext); 1156 } 1157 } 1158 1159 /* IPV6_DSTOPTS and IPV6_RTHDR socket options */ 1160 if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) { 1161 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1162 int nxt = xip6->ip6_nxt, off = sizeof(struct ip6_hdr); 1163 1164 /* 1165 * Search for destination options headers or routing 1166 * header(s) through the header chain, and stores each 1167 * header as ancillary data. 1168 * Note that the order of the headers remains in 1169 * the chain of ancillary data. 1170 */ 1171 for (;;) { /* is explicit loop prevention necessary? */ 1172 struct ip6_ext *ip6e = NULL; 1173 int elen; 1174 struct mbuf *ext = NULL; 1175 1176 /* 1177 * if it is not an extension header, don't try to 1178 * pull it from the chain. 1179 */ 1180 switch (nxt) { 1181 case IPPROTO_DSTOPTS: 1182 case IPPROTO_ROUTING: 1183 case IPPROTO_HOPOPTS: 1184 case IPPROTO_AH: /* is it possible? */ 1185 break; 1186 default: 1187 goto loopend; 1188 } 1189 1190 ext = ip6_pullexthdr(m, off, nxt); 1191 if (ext == NULL) { 1192 IP6_STATINC(IP6_STAT_TOOSHORT); 1193 return; 1194 } 1195 ip6e = mtod(ext, struct ip6_ext *); 1196 if (nxt == IPPROTO_AH) 1197 elen = (ip6e->ip6e_len + 2) << 2; 1198 else 1199 elen = (ip6e->ip6e_len + 1) << 3; 1200 if (elen != ext->m_len) { 1201 m_freem(ext); 1202 IP6_STATINC(IP6_STAT_TOOSHORT); 1203 return; 1204 } 1205 KASSERT(IP6_HDR_ALIGNED_P(ip6e)); 1206 1207 switch (nxt) { 1208 case IPPROTO_DSTOPTS: 1209 if (!(in6p->in6p_flags & IN6P_DSTOPTS)) 1210 break; 1211 1212 *mp = sbcreatecontrol((void *)ip6e, elen, 1213 IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS), 1214 IPPROTO_IPV6); 1215 if (*mp) 1216 mp = &(*mp)->m_next; 1217 break; 1218 1219 case IPPROTO_ROUTING: 1220 if (!(in6p->in6p_flags & IN6P_RTHDR)) 1221 break; 1222 1223 *mp = sbcreatecontrol((void *)ip6e, elen, 1224 IS2292(IPV6_2292RTHDR, IPV6_RTHDR), 1225 IPPROTO_IPV6); 1226 if (*mp) 1227 mp = &(*mp)->m_next; 1228 break; 1229 1230 case IPPROTO_HOPOPTS: 1231 case IPPROTO_AH: /* is it possible? */ 1232 break; 1233 1234 default: 1235 /* 1236 * other cases have been filtered in the above. 1237 * none will visit this case. here we supply 1238 * the code just in case (nxt overwritten or 1239 * other cases). 1240 */ 1241 m_freem(ext); 1242 goto loopend; 1243 1244 } 1245 1246 /* proceed with the next header. */ 1247 off += elen; 1248 nxt = ip6e->ip6e_nxt; 1249 ip6e = NULL; 1250 m_freem(ext); 1251 ext = NULL; 1252 } 1253 loopend: 1254 ; 1255 } 1256 } 1257 #undef IS2292 1258 1259 1260 void 1261 ip6_notify_pmtu(struct in6pcb *in6p, const struct sockaddr_in6 *dst, 1262 uint32_t *mtu) 1263 { 1264 struct socket *so; 1265 struct mbuf *m_mtu; 1266 struct ip6_mtuinfo mtuctl; 1267 1268 so = in6p->in6p_socket; 1269 1270 if (mtu == NULL) 1271 return; 1272 1273 #ifdef DIAGNOSTIC 1274 if (so == NULL) /* I believe this is impossible */ 1275 panic("ip6_notify_pmtu: socket is NULL"); 1276 #endif 1277 1278 memset(&mtuctl, 0, sizeof(mtuctl)); /* zero-clear for safety */ 1279 mtuctl.ip6m_mtu = *mtu; 1280 mtuctl.ip6m_addr = *dst; 1281 if (sa6_recoverscope(&mtuctl.ip6m_addr)) 1282 return; 1283 1284 if ((m_mtu = sbcreatecontrol((void *)&mtuctl, sizeof(mtuctl), 1285 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL) 1286 return; 1287 1288 if (sbappendaddr(&so->so_rcv, (const struct sockaddr *)dst, NULL, m_mtu) 1289 == 0) { 1290 m_freem(m_mtu); 1291 /* XXX: should count statistics */ 1292 } else 1293 sorwakeup(so); 1294 1295 return; 1296 } 1297 1298 /* 1299 * pull single extension header from mbuf chain. returns single mbuf that 1300 * contains the result, or NULL on error. 1301 */ 1302 static struct mbuf * 1303 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt) 1304 { 1305 struct ip6_ext ip6e; 1306 size_t elen; 1307 struct mbuf *n; 1308 1309 #ifdef DIAGNOSTIC 1310 switch (nxt) { 1311 case IPPROTO_DSTOPTS: 1312 case IPPROTO_ROUTING: 1313 case IPPROTO_HOPOPTS: 1314 case IPPROTO_AH: /* is it possible? */ 1315 break; 1316 default: 1317 printf("ip6_pullexthdr: invalid nxt=%d\n", nxt); 1318 } 1319 #endif 1320 1321 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1322 if (nxt == IPPROTO_AH) 1323 elen = (ip6e.ip6e_len + 2) << 2; 1324 else 1325 elen = (ip6e.ip6e_len + 1) << 3; 1326 1327 MGET(n, M_DONTWAIT, MT_DATA); 1328 if (n && elen >= MLEN) { 1329 MCLGET(n, M_DONTWAIT); 1330 if ((n->m_flags & M_EXT) == 0) { 1331 m_free(n); 1332 n = NULL; 1333 } 1334 } 1335 if (!n) 1336 return NULL; 1337 1338 n->m_len = 0; 1339 if (elen >= M_TRAILINGSPACE(n)) { 1340 m_free(n); 1341 return NULL; 1342 } 1343 1344 m_copydata(m, off, elen, mtod(n, void *)); 1345 n->m_len = elen; 1346 return n; 1347 } 1348 1349 /* 1350 * Get pointer to the previous header followed by the header 1351 * currently processed. 1352 * XXX: This function supposes that 1353 * M includes all headers, 1354 * the next header field and the header length field of each header 1355 * are valid, and 1356 * the sum of each header length equals to OFF. 1357 * Because of these assumptions, this function must be called very 1358 * carefully. Moreover, it will not be used in the near future when 1359 * we develop `neater' mechanism to process extension headers. 1360 */ 1361 u_int8_t * 1362 ip6_get_prevhdr(struct mbuf *m, int off) 1363 { 1364 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1365 1366 if (off == sizeof(struct ip6_hdr)) 1367 return (&ip6->ip6_nxt); 1368 else { 1369 int len, nxt; 1370 struct ip6_ext *ip6e = NULL; 1371 1372 nxt = ip6->ip6_nxt; 1373 len = sizeof(struct ip6_hdr); 1374 while (len < off) { 1375 ip6e = (struct ip6_ext *)(mtod(m, char *) + len); 1376 1377 switch (nxt) { 1378 case IPPROTO_FRAGMENT: 1379 len += sizeof(struct ip6_frag); 1380 break; 1381 case IPPROTO_AH: 1382 len += (ip6e->ip6e_len + 2) << 2; 1383 break; 1384 default: 1385 len += (ip6e->ip6e_len + 1) << 3; 1386 break; 1387 } 1388 nxt = ip6e->ip6e_nxt; 1389 } 1390 if (ip6e) 1391 return (&ip6e->ip6e_nxt); 1392 else 1393 return NULL; 1394 } 1395 } 1396 1397 /* 1398 * get next header offset. m will be retained. 1399 */ 1400 int 1401 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp) 1402 { 1403 struct ip6_hdr ip6; 1404 struct ip6_ext ip6e; 1405 struct ip6_frag fh; 1406 1407 /* just in case */ 1408 if (m == NULL) 1409 panic("ip6_nexthdr: m == NULL"); 1410 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off) 1411 return -1; 1412 1413 switch (proto) { 1414 case IPPROTO_IPV6: 1415 /* do not chase beyond intermediate IPv6 headers */ 1416 if (off != 0) 1417 return -1; 1418 if (m->m_pkthdr.len < off + sizeof(ip6)) 1419 return -1; 1420 m_copydata(m, off, sizeof(ip6), (void *)&ip6); 1421 if (nxtp) 1422 *nxtp = ip6.ip6_nxt; 1423 off += sizeof(ip6); 1424 return off; 1425 1426 case IPPROTO_FRAGMENT: 1427 /* 1428 * terminate parsing if it is not the first fragment, 1429 * it does not make sense to parse through it. 1430 */ 1431 if (m->m_pkthdr.len < off + sizeof(fh)) 1432 return -1; 1433 m_copydata(m, off, sizeof(fh), (void *)&fh); 1434 if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0) 1435 return -1; 1436 if (nxtp) 1437 *nxtp = fh.ip6f_nxt; 1438 off += sizeof(struct ip6_frag); 1439 return off; 1440 1441 case IPPROTO_AH: 1442 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1443 return -1; 1444 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1445 if (nxtp) 1446 *nxtp = ip6e.ip6e_nxt; 1447 off += (ip6e.ip6e_len + 2) << 2; 1448 if (m->m_pkthdr.len < off) 1449 return -1; 1450 return off; 1451 1452 case IPPROTO_HOPOPTS: 1453 case IPPROTO_ROUTING: 1454 case IPPROTO_DSTOPTS: 1455 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1456 return -1; 1457 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1458 if (nxtp) 1459 *nxtp = ip6e.ip6e_nxt; 1460 off += (ip6e.ip6e_len + 1) << 3; 1461 if (m->m_pkthdr.len < off) 1462 return -1; 1463 return off; 1464 1465 case IPPROTO_NONE: 1466 case IPPROTO_ESP: 1467 case IPPROTO_IPCOMP: 1468 /* give up */ 1469 return -1; 1470 1471 default: 1472 return -1; 1473 } 1474 } 1475 1476 /* 1477 * get offset for the last header in the chain. m will be kept untainted. 1478 */ 1479 int 1480 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp) 1481 { 1482 int newoff; 1483 int nxt; 1484 1485 if (!nxtp) { 1486 nxt = -1; 1487 nxtp = &nxt; 1488 } 1489 for (;;) { 1490 newoff = ip6_nexthdr(m, off, proto, nxtp); 1491 if (newoff < 0) 1492 return off; 1493 else if (newoff < off) 1494 return -1; /* invalid */ 1495 else if (newoff == off) 1496 return newoff; 1497 1498 off = newoff; 1499 proto = *nxtp; 1500 } 1501 } 1502 1503 struct m_tag * 1504 ip6_addaux(struct mbuf *m) 1505 { 1506 struct m_tag *mtag; 1507 1508 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1509 if (!mtag) { 1510 mtag = m_tag_get(PACKET_TAG_INET6, sizeof(struct ip6aux), 1511 M_NOWAIT); 1512 if (mtag) { 1513 m_tag_prepend(m, mtag); 1514 memset(mtag + 1, 0, sizeof(struct ip6aux)); 1515 } 1516 } 1517 return mtag; 1518 } 1519 1520 struct m_tag * 1521 ip6_findaux(struct mbuf *m) 1522 { 1523 struct m_tag *mtag; 1524 1525 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1526 return mtag; 1527 } 1528 1529 void 1530 ip6_delaux(struct mbuf *m) 1531 { 1532 struct m_tag *mtag; 1533 1534 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1535 if (mtag) 1536 m_tag_delete(m, mtag); 1537 } 1538 1539 #ifdef GATEWAY 1540 /* 1541 * sysctl helper routine for net.inet.ip6.maxflows. Since 1542 * we could reduce this value, call ip6flow_reap(); 1543 */ 1544 static int 1545 sysctl_net_inet6_ip6_maxflows(SYSCTLFN_ARGS) 1546 { 1547 int error; 1548 1549 error = sysctl_lookup(SYSCTLFN_CALL(rnode)); 1550 if (error || newp == NULL) 1551 return (error); 1552 1553 mutex_enter(softnet_lock); 1554 KERNEL_LOCK(1, NULL); 1555 1556 ip6flow_reap(0); 1557 1558 KERNEL_UNLOCK_ONE(NULL); 1559 mutex_exit(softnet_lock); 1560 1561 return (0); 1562 } 1563 1564 static int 1565 sysctl_net_inet6_ip6_hashsize(SYSCTLFN_ARGS) 1566 { 1567 int error, tmp; 1568 struct sysctlnode node; 1569 1570 node = *rnode; 1571 tmp = ip6_hashsize; 1572 node.sysctl_data = &tmp; 1573 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 1574 if (error || newp == NULL) 1575 return (error); 1576 1577 if ((tmp & (tmp - 1)) == 0 && tmp != 0) { 1578 /* 1579 * Can only fail due to malloc() 1580 */ 1581 mutex_enter(softnet_lock); 1582 KERNEL_LOCK(1, NULL); 1583 1584 error = ip6flow_invalidate_all(tmp); 1585 1586 KERNEL_UNLOCK_ONE(NULL); 1587 mutex_exit(softnet_lock); 1588 } else { 1589 /* 1590 * EINVAL if not a power of 2 1591 */ 1592 error = EINVAL; 1593 } 1594 1595 return error; 1596 } 1597 #endif /* GATEWAY */ 1598 1599 /* 1600 * System control for IP6 1601 */ 1602 1603 const u_char inet6ctlerrmap[PRC_NCMDS] = { 1604 0, 0, 0, 0, 1605 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 1606 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 1607 EMSGSIZE, EHOSTUNREACH, 0, 0, 1608 0, 0, 0, 0, 1609 ENOPROTOOPT 1610 }; 1611 1612 static int 1613 sysctl_net_inet6_ip6_stats(SYSCTLFN_ARGS) 1614 { 1615 1616 return (NETSTAT_SYSCTL(ip6stat_percpu, IP6_NSTATS)); 1617 } 1618 1619 static void 1620 sysctl_net_inet6_ip6_setup(struct sysctllog **clog) 1621 { 1622 #ifdef RFC2292 1623 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y)) 1624 #else 1625 #define IS2292(x, y) (y) 1626 #endif 1627 1628 sysctl_createv(clog, 0, NULL, NULL, 1629 CTLFLAG_PERMANENT, 1630 CTLTYPE_NODE, "inet6", 1631 SYSCTL_DESCR("PF_INET6 related settings"), 1632 NULL, 0, NULL, 0, 1633 CTL_NET, PF_INET6, CTL_EOL); 1634 sysctl_createv(clog, 0, NULL, NULL, 1635 CTLFLAG_PERMANENT, 1636 CTLTYPE_NODE, "ip6", 1637 SYSCTL_DESCR("IPv6 related settings"), 1638 NULL, 0, NULL, 0, 1639 CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_EOL); 1640 1641 sysctl_createv(clog, 0, NULL, NULL, 1642 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1643 CTLTYPE_INT, "forwarding", 1644 SYSCTL_DESCR("Enable forwarding of INET6 datagrams"), 1645 NULL, 0, &ip6_forwarding, 0, 1646 CTL_NET, PF_INET6, IPPROTO_IPV6, 1647 IPV6CTL_FORWARDING, CTL_EOL); 1648 sysctl_createv(clog, 0, NULL, NULL, 1649 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1650 CTLTYPE_INT, "redirect", 1651 SYSCTL_DESCR("Enable sending of ICMPv6 redirect messages"), 1652 NULL, 0, &ip6_sendredirects, 0, 1653 CTL_NET, PF_INET6, IPPROTO_IPV6, 1654 IPV6CTL_SENDREDIRECTS, CTL_EOL); 1655 sysctl_createv(clog, 0, NULL, NULL, 1656 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1657 CTLTYPE_INT, "hlim", 1658 SYSCTL_DESCR("Hop limit for an INET6 datagram"), 1659 NULL, 0, &ip6_defhlim, 0, 1660 CTL_NET, PF_INET6, IPPROTO_IPV6, 1661 IPV6CTL_DEFHLIM, CTL_EOL); 1662 #ifdef notyet 1663 sysctl_createv(clog, 0, NULL, NULL, 1664 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1665 CTLTYPE_INT, "mtu", NULL, 1666 NULL, 0, &, 0, 1667 CTL_NET, PF_INET6, IPPROTO_IPV6, 1668 IPV6CTL_DEFMTU, CTL_EOL); 1669 #endif 1670 #ifdef __no_idea__ 1671 sysctl_createv(clog, 0, NULL, NULL, 1672 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1673 CTLTYPE_INT, "forwsrcrt", NULL, 1674 NULL, 0, &?, 0, 1675 CTL_NET, PF_INET6, IPPROTO_IPV6, 1676 IPV6CTL_FORWSRCRT, CTL_EOL); 1677 sysctl_createv(clog, 0, NULL, NULL, 1678 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1679 CTLTYPE_STRUCT, "mrtstats", NULL, 1680 NULL, 0, &?, sizeof(?), 1681 CTL_NET, PF_INET6, IPPROTO_IPV6, 1682 IPV6CTL_MRTSTATS, CTL_EOL); 1683 sysctl_createv(clog, 0, NULL, NULL, 1684 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1685 CTLTYPE_?, "mrtproto", NULL, 1686 NULL, 0, &?, sizeof(?), 1687 CTL_NET, PF_INET6, IPPROTO_IPV6, 1688 IPV6CTL_MRTPROTO, CTL_EOL); 1689 #endif 1690 sysctl_createv(clog, 0, NULL, NULL, 1691 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1692 CTLTYPE_INT, "maxfragpackets", 1693 SYSCTL_DESCR("Maximum number of fragments to buffer " 1694 "for reassembly"), 1695 NULL, 0, &ip6_maxfragpackets, 0, 1696 CTL_NET, PF_INET6, IPPROTO_IPV6, 1697 IPV6CTL_MAXFRAGPACKETS, CTL_EOL); 1698 #ifdef __no_idea__ 1699 sysctl_createv(clog, 0, NULL, NULL, 1700 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1701 CTLTYPE_INT, "sourcecheck", NULL, 1702 NULL, 0, &?, 0, 1703 CTL_NET, PF_INET6, IPPROTO_IPV6, 1704 IPV6CTL_SOURCECHECK, CTL_EOL); 1705 sysctl_createv(clog, 0, NULL, NULL, 1706 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1707 CTLTYPE_INT, "sourcecheck_logint", NULL, 1708 NULL, 0, &?, 0, 1709 CTL_NET, PF_INET6, IPPROTO_IPV6, 1710 IPV6CTL_SOURCECHECK_LOGINT, CTL_EOL); 1711 #endif 1712 sysctl_createv(clog, 0, NULL, NULL, 1713 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1714 CTLTYPE_INT, "accept_rtadv", 1715 SYSCTL_DESCR("Accept router advertisements"), 1716 NULL, 0, &ip6_accept_rtadv, 0, 1717 CTL_NET, PF_INET6, IPPROTO_IPV6, 1718 IPV6CTL_ACCEPT_RTADV, CTL_EOL); 1719 sysctl_createv(clog, 0, NULL, NULL, 1720 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1721 CTLTYPE_INT, "rtadv_maxroutes", 1722 SYSCTL_DESCR("Maximum number of routes accepted via router advertisements"), 1723 NULL, 0, &ip6_rtadv_maxroutes, 0, 1724 CTL_NET, PF_INET6, IPPROTO_IPV6, 1725 IPV6CTL_RTADV_MAXROUTES, CTL_EOL); 1726 sysctl_createv(clog, 0, NULL, NULL, 1727 CTLFLAG_PERMANENT, 1728 CTLTYPE_INT, "rtadv_numroutes", 1729 SYSCTL_DESCR("Current number of routes accepted via router advertisements"), 1730 NULL, 0, &nd6_numroutes, 0, 1731 CTL_NET, PF_INET6, IPPROTO_IPV6, 1732 IPV6CTL_RTADV_NUMROUTES, CTL_EOL); 1733 sysctl_createv(clog, 0, NULL, NULL, 1734 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1735 CTLTYPE_INT, "keepfaith", 1736 SYSCTL_DESCR("Activate faith interface"), 1737 NULL, 0, &ip6_keepfaith, 0, 1738 CTL_NET, PF_INET6, IPPROTO_IPV6, 1739 IPV6CTL_KEEPFAITH, CTL_EOL); 1740 sysctl_createv(clog, 0, NULL, NULL, 1741 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1742 CTLTYPE_INT, "log_interval", 1743 SYSCTL_DESCR("Minumum interval between logging " 1744 "unroutable packets"), 1745 NULL, 0, &ip6_log_interval, 0, 1746 CTL_NET, PF_INET6, IPPROTO_IPV6, 1747 IPV6CTL_LOG_INTERVAL, CTL_EOL); 1748 sysctl_createv(clog, 0, NULL, NULL, 1749 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1750 CTLTYPE_INT, "hdrnestlimit", 1751 SYSCTL_DESCR("Maximum number of nested IPv6 headers"), 1752 NULL, 0, &ip6_hdrnestlimit, 0, 1753 CTL_NET, PF_INET6, IPPROTO_IPV6, 1754 IPV6CTL_HDRNESTLIMIT, CTL_EOL); 1755 sysctl_createv(clog, 0, NULL, NULL, 1756 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1757 CTLTYPE_INT, "dad_count", 1758 SYSCTL_DESCR("Number of Duplicate Address Detection " 1759 "probes to send"), 1760 NULL, 0, &ip6_dad_count, 0, 1761 CTL_NET, PF_INET6, IPPROTO_IPV6, 1762 IPV6CTL_DAD_COUNT, CTL_EOL); 1763 sysctl_createv(clog, 0, NULL, NULL, 1764 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1765 CTLTYPE_INT, "auto_flowlabel", 1766 SYSCTL_DESCR("Assign random IPv6 flow labels"), 1767 NULL, 0, &ip6_auto_flowlabel, 0, 1768 CTL_NET, PF_INET6, IPPROTO_IPV6, 1769 IPV6CTL_AUTO_FLOWLABEL, CTL_EOL); 1770 sysctl_createv(clog, 0, NULL, NULL, 1771 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1772 CTLTYPE_INT, "defmcasthlim", 1773 SYSCTL_DESCR("Default multicast hop limit"), 1774 NULL, 0, &ip6_defmcasthlim, 0, 1775 CTL_NET, PF_INET6, IPPROTO_IPV6, 1776 IPV6CTL_DEFMCASTHLIM, CTL_EOL); 1777 #if NGIF > 0 1778 sysctl_createv(clog, 0, NULL, NULL, 1779 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1780 CTLTYPE_INT, "gifhlim", 1781 SYSCTL_DESCR("Default hop limit for a gif tunnel datagram"), 1782 NULL, 0, &ip6_gif_hlim, 0, 1783 CTL_NET, PF_INET6, IPPROTO_IPV6, 1784 IPV6CTL_GIF_HLIM, CTL_EOL); 1785 #endif /* NGIF */ 1786 sysctl_createv(clog, 0, NULL, NULL, 1787 CTLFLAG_PERMANENT, 1788 CTLTYPE_STRING, "kame_version", 1789 SYSCTL_DESCR("KAME Version"), 1790 NULL, 0, __UNCONST(__KAME_VERSION), 0, 1791 CTL_NET, PF_INET6, IPPROTO_IPV6, 1792 IPV6CTL_KAME_VERSION, CTL_EOL); 1793 sysctl_createv(clog, 0, NULL, NULL, 1794 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1795 CTLTYPE_INT, "use_deprecated", 1796 SYSCTL_DESCR("Allow use of deprecated addresses as " 1797 "source addresses"), 1798 NULL, 0, &ip6_use_deprecated, 0, 1799 CTL_NET, PF_INET6, IPPROTO_IPV6, 1800 IPV6CTL_USE_DEPRECATED, CTL_EOL); 1801 sysctl_createv(clog, 0, NULL, NULL, 1802 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1803 CTLTYPE_INT, "rr_prune", NULL, 1804 NULL, 0, &ip6_rr_prune, 0, 1805 CTL_NET, PF_INET6, IPPROTO_IPV6, 1806 IPV6CTL_RR_PRUNE, CTL_EOL); 1807 sysctl_createv(clog, 0, NULL, NULL, 1808 CTLFLAG_PERMANENT 1809 #ifndef INET6_BINDV6ONLY 1810 |CTLFLAG_READWRITE, 1811 #endif 1812 CTLTYPE_INT, "v6only", 1813 SYSCTL_DESCR("Disallow PF_INET6 sockets from connecting " 1814 "to PF_INET sockets"), 1815 NULL, 0, &ip6_v6only, 0, 1816 CTL_NET, PF_INET6, IPPROTO_IPV6, 1817 IPV6CTL_V6ONLY, CTL_EOL); 1818 sysctl_createv(clog, 0, NULL, NULL, 1819 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1820 CTLTYPE_INT, "auto_linklocal", 1821 SYSCTL_DESCR("Default value of per-interface flag for " 1822 "adding an IPv6 link-local address to " 1823 "interfaces when attached"), 1824 NULL, 0, &ip6_auto_linklocal, 0, 1825 CTL_NET, PF_INET6, IPPROTO_IPV6, 1826 IPV6CTL_AUTO_LINKLOCAL, CTL_EOL); 1827 sysctl_createv(clog, 0, NULL, NULL, 1828 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1829 CTLTYPE_INT, "anonportmin", 1830 SYSCTL_DESCR("Lowest ephemeral port number to assign"), 1831 sysctl_net_inet_ip_ports, 0, &ip6_anonportmin, 0, 1832 CTL_NET, PF_INET6, IPPROTO_IPV6, 1833 IPV6CTL_ANONPORTMIN, CTL_EOL); 1834 sysctl_createv(clog, 0, NULL, NULL, 1835 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1836 CTLTYPE_INT, "anonportmax", 1837 SYSCTL_DESCR("Highest ephemeral port number to assign"), 1838 sysctl_net_inet_ip_ports, 0, &ip6_anonportmax, 0, 1839 CTL_NET, PF_INET6, IPPROTO_IPV6, 1840 IPV6CTL_ANONPORTMAX, CTL_EOL); 1841 #ifndef IPNOPRIVPORTS 1842 sysctl_createv(clog, 0, NULL, NULL, 1843 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1844 CTLTYPE_INT, "lowportmin", 1845 SYSCTL_DESCR("Lowest privileged ephemeral port number " 1846 "to assign"), 1847 sysctl_net_inet_ip_ports, 0, &ip6_lowportmin, 0, 1848 CTL_NET, PF_INET6, IPPROTO_IPV6, 1849 IPV6CTL_LOWPORTMIN, CTL_EOL); 1850 sysctl_createv(clog, 0, NULL, NULL, 1851 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1852 CTLTYPE_INT, "lowportmax", 1853 SYSCTL_DESCR("Highest privileged ephemeral port number " 1854 "to assign"), 1855 sysctl_net_inet_ip_ports, 0, &ip6_lowportmax, 0, 1856 CTL_NET, PF_INET6, IPPROTO_IPV6, 1857 IPV6CTL_LOWPORTMAX, CTL_EOL); 1858 #endif /* IPNOPRIVPORTS */ 1859 sysctl_createv(clog, 0, NULL, NULL, 1860 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1861 CTLTYPE_INT, "use_tempaddr", 1862 SYSCTL_DESCR("Use temporary address"), 1863 NULL, 0, &ip6_use_tempaddr, 0, 1864 CTL_NET, PF_INET6, IPPROTO_IPV6, 1865 CTL_CREATE, CTL_EOL); 1866 sysctl_createv(clog, 0, NULL, NULL, 1867 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1868 CTLTYPE_INT, "prefer_tempaddr", 1869 SYSCTL_DESCR("Prefer temporary address as source " 1870 "address"), 1871 NULL, 0, &ip6_prefer_tempaddr, 0, 1872 CTL_NET, PF_INET6, IPPROTO_IPV6, 1873 CTL_CREATE, CTL_EOL); 1874 sysctl_createv(clog, 0, NULL, NULL, 1875 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1876 CTLTYPE_INT, "temppltime", 1877 SYSCTL_DESCR("preferred lifetime of a temporary address"), 1878 NULL, 0, &ip6_temp_preferred_lifetime, 0, 1879 CTL_NET, PF_INET6, IPPROTO_IPV6, 1880 CTL_CREATE, CTL_EOL); 1881 sysctl_createv(clog, 0, NULL, NULL, 1882 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1883 CTLTYPE_INT, "tempvltime", 1884 SYSCTL_DESCR("valid lifetime of a temporary address"), 1885 NULL, 0, &ip6_temp_valid_lifetime, 0, 1886 CTL_NET, PF_INET6, IPPROTO_IPV6, 1887 CTL_CREATE, CTL_EOL); 1888 sysctl_createv(clog, 0, NULL, NULL, 1889 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1890 CTLTYPE_INT, "maxfrags", 1891 SYSCTL_DESCR("Maximum fragments in reassembly queue"), 1892 NULL, 0, &ip6_maxfrags, 0, 1893 CTL_NET, PF_INET6, IPPROTO_IPV6, 1894 IPV6CTL_MAXFRAGS, CTL_EOL); 1895 sysctl_createv(clog, 0, NULL, NULL, 1896 CTLFLAG_PERMANENT, 1897 CTLTYPE_STRUCT, "stats", 1898 SYSCTL_DESCR("IPv6 statistics"), 1899 sysctl_net_inet6_ip6_stats, 0, NULL, 0, 1900 CTL_NET, PF_INET6, IPPROTO_IPV6, 1901 IPV6CTL_STATS, CTL_EOL); 1902 sysctl_createv(clog, 0, NULL, NULL, 1903 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1904 CTLTYPE_INT, "use_defaultzone", 1905 SYSCTL_DESCR("Whether to use the default scope zones"), 1906 NULL, 0, &ip6_use_defzone, 0, 1907 CTL_NET, PF_INET6, IPPROTO_IPV6, 1908 IPV6CTL_USE_DEFAULTZONE, CTL_EOL); 1909 sysctl_createv(clog, 0, NULL, NULL, 1910 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1911 CTLTYPE_INT, "mcast_pmtu", 1912 SYSCTL_DESCR("Enable pMTU discovery for multicast packet"), 1913 NULL, 0, &ip6_mcast_pmtu, 0, 1914 CTL_NET, PF_INET6, IPPROTO_IPV6, 1915 CTL_CREATE, CTL_EOL); 1916 #ifdef GATEWAY 1917 sysctl_createv(clog, 0, NULL, NULL, 1918 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1919 CTLTYPE_INT, "maxflows", 1920 SYSCTL_DESCR("Number of flows for fast forwarding (IPv6)"), 1921 sysctl_net_inet6_ip6_maxflows, 0, &ip6_maxflows, 0, 1922 CTL_NET, PF_INET6, IPPROTO_IPV6, 1923 CTL_CREATE, CTL_EOL); 1924 sysctl_createv(clog, 0, NULL, NULL, 1925 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1926 CTLTYPE_INT, "hashsize", 1927 SYSCTL_DESCR("Size of hash table for fast forwarding (IPv6)"), 1928 sysctl_net_inet6_ip6_hashsize, 0, &ip6_hashsize, 0, 1929 CTL_NET, PF_INET6, IPPROTO_IPV6, 1930 CTL_CREATE, CTL_EOL); 1931 #endif 1932 /* anonportalgo RFC6056 subtree */ 1933 const struct sysctlnode *portalgo_node; 1934 sysctl_createv(clog, 0, NULL, &portalgo_node, 1935 CTLFLAG_PERMANENT, 1936 CTLTYPE_NODE, "anonportalgo", 1937 SYSCTL_DESCR("Anonymous port algorithm selection (RFC 6056)"), 1938 NULL, 0, NULL, 0, 1939 CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_CREATE, CTL_EOL); 1940 sysctl_createv(clog, 0, &portalgo_node, NULL, 1941 CTLFLAG_PERMANENT, 1942 CTLTYPE_STRING, "available", 1943 SYSCTL_DESCR("available algorithms"), 1944 sysctl_portalgo_available, 0, NULL, PORTALGO_MAXLEN, 1945 CTL_CREATE, CTL_EOL); 1946 sysctl_createv(clog, 0, &portalgo_node, NULL, 1947 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1948 CTLTYPE_STRING, "selected", 1949 SYSCTL_DESCR("selected algorithm"), 1950 sysctl_portalgo_selected6, 0, NULL, PORTALGO_MAXLEN, 1951 CTL_CREATE, CTL_EOL); 1952 sysctl_createv(clog, 0, &portalgo_node, NULL, 1953 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1954 CTLTYPE_STRUCT, "reserve", 1955 SYSCTL_DESCR("bitmap of reserved ports"), 1956 sysctl_portalgo_reserve6, 0, NULL, 0, 1957 CTL_CREATE, CTL_EOL); 1958 sysctl_createv(clog, 0, NULL, NULL, 1959 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1960 CTLTYPE_INT, "neighborgcthresh", 1961 SYSCTL_DESCR("Maximum number of entries in neighbor" 1962 " cache"), 1963 NULL, 1, &ip6_neighborgcthresh, 0, 1964 CTL_NET, PF_INET6, IPPROTO_IPV6, 1965 CTL_CREATE, CTL_EOL); 1966 sysctl_createv(clog, 0, NULL, NULL, 1967 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1968 CTLTYPE_INT, "maxifprefixes", 1969 SYSCTL_DESCR("Maximum number of prefixes created by" 1970 " route advertisement per interface"), 1971 NULL, 1, &ip6_maxifprefixes, 0, 1972 CTL_NET, PF_INET6, IPPROTO_IPV6, 1973 CTL_CREATE, CTL_EOL); 1974 sysctl_createv(clog, 0, NULL, NULL, 1975 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1976 CTLTYPE_INT, "maxifdefrouters", 1977 SYSCTL_DESCR("Maximum number of default routers created" 1978 " by route advertisement per interface"), 1979 NULL, 1, &ip6_maxifdefrouters, 0, 1980 CTL_NET, PF_INET6, IPPROTO_IPV6, 1981 CTL_CREATE, CTL_EOL); 1982 sysctl_createv(clog, 0, NULL, NULL, 1983 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1984 CTLTYPE_INT, "maxdynroutes", 1985 SYSCTL_DESCR("Maximum number of routes created via" 1986 " redirect"), 1987 NULL, 1, &ip6_maxdynroutes, 0, 1988 CTL_NET, PF_INET6, IPPROTO_IPV6, 1989 CTL_CREATE, CTL_EOL); 1990 } 1991 1992 void 1993 ip6_statinc(u_int stat) 1994 { 1995 1996 KASSERT(stat < IP6_NSTATS); 1997 IP6_STATINC(stat); 1998 } 1999