1 /* $NetBSD: ip6_input.c,v 1.185 2017/11/25 13:18:02 kre 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 1.185 2017/11/25 13:18:02 kre Exp $"); 66 67 #ifdef _KERNEL_OPT 68 #include "opt_gateway.h" 69 #include "opt_inet.h" 70 #include "opt_inet6.h" 71 #include "opt_ipsec.h" 72 #include "opt_net_mpsafe.h" 73 #endif 74 75 #include <sys/param.h> 76 #include <sys/systm.h> 77 #include <sys/mbuf.h> 78 #include <sys/domain.h> 79 #include <sys/protosw.h> 80 #include <sys/socket.h> 81 #include <sys/socketvar.h> 82 #include <sys/errno.h> 83 #include <sys/time.h> 84 #include <sys/kernel.h> 85 #include <sys/syslog.h> 86 #include <sys/proc.h> 87 #include <sys/sysctl.h> 88 #include <sys/cprng.h> 89 #include <sys/percpu.h> 90 91 #include <net/if.h> 92 #include <net/if_types.h> 93 #include <net/if_dl.h> 94 #include <net/route.h> 95 #include <net/pktqueue.h> 96 #include <net/pfil.h> 97 98 #include <netinet/in.h> 99 #include <netinet/in_systm.h> 100 #ifdef INET 101 #include <netinet/ip.h> 102 #include <netinet/ip_var.h> 103 #include <netinet/ip_icmp.h> 104 #endif /* INET */ 105 #include <netinet/ip6.h> 106 #include <netinet/portalgo.h> 107 #include <netinet6/in6_var.h> 108 #include <netinet6/ip6_var.h> 109 #include <netinet6/ip6_private.h> 110 #include <netinet6/in6_pcb.h> 111 #include <netinet/icmp6.h> 112 #include <netinet6/scope6_var.h> 113 #include <netinet6/in6_ifattach.h> 114 #include <netinet6/nd6.h> 115 116 #ifdef IPSEC 117 #include <netipsec/ipsec.h> 118 #include <netipsec/ipsec6.h> 119 #include <netipsec/key.h> 120 #endif /* IPSEC */ 121 122 #include <netinet6/ip6protosw.h> 123 124 #include "faith.h" 125 126 #include <net/net_osdep.h> 127 128 extern struct domain inet6domain; 129 130 u_char ip6_protox[IPPROTO_MAX]; 131 pktqueue_t *ip6_pktq __read_mostly; 132 133 int ip6_forward_srcrt; /* XXX */ 134 int ip6_sourcecheck; /* XXX */ 135 int ip6_sourcecheck_interval; /* XXX */ 136 137 pfil_head_t *inet6_pfil_hook; 138 139 percpu_t *ip6stat_percpu; 140 141 percpu_t *ip6_forward_rt_percpu __cacheline_aligned; 142 143 static void ip6_init2(void); 144 static void ip6intr(void *); 145 static struct m_tag *ip6_setdstifaddr(struct mbuf *, const struct in6_ifaddr *); 146 147 static int ip6_process_hopopts(struct mbuf *, u_int8_t *, int, u_int32_t *, 148 u_int32_t *); 149 static struct mbuf *ip6_pullexthdr(struct mbuf *, size_t, int); 150 static void sysctl_net_inet6_ip6_setup(struct sysctllog **); 151 152 #ifdef NET_MPSAFE 153 #define SOFTNET_LOCK() mutex_enter(softnet_lock) 154 #define SOFTNET_UNLOCK() mutex_exit(softnet_lock) 155 #else 156 #define SOFTNET_LOCK() KASSERT(mutex_owned(softnet_lock)) 157 #define SOFTNET_UNLOCK() KASSERT(mutex_owned(softnet_lock)) 158 #endif 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 in6_init(); 171 172 sysctl_net_inet6_ip6_setup(NULL); 173 pr = (const struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 174 if (pr == 0) 175 panic("ip6_init"); 176 for (i = 0; i < IPPROTO_MAX; i++) 177 ip6_protox[i] = pr - inet6sw; 178 for (pr = (const struct ip6protosw *)inet6domain.dom_protosw; 179 pr < (const struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++) 180 if (pr->pr_domain->dom_family == PF_INET6 && 181 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) 182 ip6_protox[pr->pr_protocol] = pr - inet6sw; 183 184 ip6_pktq = pktq_create(IFQ_MAXLEN, ip6intr, NULL); 185 KASSERT(ip6_pktq != NULL); 186 187 scope6_init(); 188 addrsel_policy_init(); 189 nd6_init(); 190 frag6_init(); 191 ip6_desync_factor = cprng_fast32() % MAX_TEMP_DESYNC_FACTOR; 192 193 ip6_init2(); 194 #ifdef GATEWAY 195 ip6flow_init(ip6_hashsize); 196 #endif 197 /* Register our Packet Filter hook. */ 198 inet6_pfil_hook = pfil_head_create(PFIL_TYPE_AF, (void *)AF_INET6); 199 KASSERT(inet6_pfil_hook != NULL); 200 201 ip6stat_percpu = percpu_alloc(sizeof(uint64_t) * IP6_NSTATS); 202 ip6_forward_rt_percpu = percpu_alloc(sizeof(struct route)); 203 } 204 205 static void 206 ip6_init2(void) 207 { 208 209 /* timer for regeneranation of temporary addresses randomize ID */ 210 callout_init(&in6_tmpaddrtimer_ch, CALLOUT_MPSAFE); 211 callout_reset(&in6_tmpaddrtimer_ch, 212 (ip6_temp_preferred_lifetime - ip6_desync_factor - 213 ip6_temp_regen_advance) * hz, 214 in6_tmpaddrtimer, NULL); 215 } 216 217 /* 218 * IP6 input interrupt handling. Just pass the packet to ip6_input. 219 */ 220 static void 221 ip6intr(void *arg __unused) 222 { 223 struct mbuf *m; 224 225 SOFTNET_LOCK_UNLESS_NET_MPSAFE(); 226 while ((m = pktq_dequeue(ip6_pktq)) != NULL) { 227 struct psref psref; 228 struct ifnet *rcvif = m_get_rcvif_psref(m, &psref); 229 230 if (rcvif == NULL) { 231 m_freem(m); 232 continue; 233 } 234 /* 235 * Drop the packet if IPv6 is disabled on the interface. 236 */ 237 if ((ND_IFINFO(rcvif)->flags & ND6_IFF_IFDISABLED)) { 238 m_put_rcvif_psref(rcvif, &psref); 239 m_freem(m); 240 continue; 241 } 242 ip6_input(m, rcvif); 243 m_put_rcvif_psref(rcvif, &psref); 244 } 245 SOFTNET_UNLOCK_UNLESS_NET_MPSAFE(); 246 } 247 248 void 249 ip6_input(struct mbuf *m, struct ifnet *rcvif) 250 { 251 struct ip6_hdr *ip6; 252 int hit, off = sizeof(struct ip6_hdr), nest; 253 u_int32_t plen; 254 u_int32_t rtalert = ~0; 255 int nxt, ours = 0, rh_present = 0; 256 struct ifnet *deliverifp = NULL; 257 int srcrt = 0; 258 struct rtentry *rt = NULL; 259 union { 260 struct sockaddr dst; 261 struct sockaddr_in6 dst6; 262 } u; 263 struct route *ro; 264 265 /* 266 * make sure we don't have onion peering information into m_tag. 267 */ 268 ip6_delaux(m); 269 270 /* 271 * mbuf statistics 272 */ 273 if (m->m_flags & M_EXT) { 274 if (m->m_next) 275 IP6_STATINC(IP6_STAT_MEXT2M); 276 else 277 IP6_STATINC(IP6_STAT_MEXT1); 278 } else { 279 #define M2MMAX 32 280 if (m->m_next) { 281 if (m->m_flags & M_LOOP) 282 /*XXX*/ IP6_STATINC(IP6_STAT_M2M + lo0ifp->if_index); 283 else if (rcvif->if_index < M2MMAX) 284 IP6_STATINC(IP6_STAT_M2M + rcvif->if_index); 285 else 286 IP6_STATINC(IP6_STAT_M2M); 287 } else 288 IP6_STATINC(IP6_STAT_M1); 289 #undef M2MMAX 290 } 291 292 in6_ifstat_inc(rcvif, ifs6_in_receive); 293 IP6_STATINC(IP6_STAT_TOTAL); 294 295 /* 296 * If the IPv6 header is not aligned, slurp it up into a new 297 * mbuf with space for link headers, in the event we forward 298 * it. Otherwise, if it is aligned, make sure the entire base 299 * IPv6 header is in the first mbuf of the chain. 300 */ 301 if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 302 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 303 (max_linkhdr + 3) & ~3)) == NULL) { 304 /* XXXJRT new stat, please */ 305 IP6_STATINC(IP6_STAT_TOOSMALL); 306 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 307 return; 308 } 309 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 310 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 311 IP6_STATINC(IP6_STAT_TOOSMALL); 312 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 313 return; 314 } 315 } 316 317 ip6 = mtod(m, struct ip6_hdr *); 318 319 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 320 IP6_STATINC(IP6_STAT_BADVERS); 321 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 322 goto bad; 323 } 324 325 /* 326 * Assume that we can create a fast-forward IP flow entry 327 * based on this packet. 328 */ 329 m->m_flags |= M_CANFASTFWD; 330 331 /* 332 * Run through list of hooks for input packets. If there are any 333 * filters which require that additional packets in the flow are 334 * not fast-forwarded, they must clear the M_CANFASTFWD flag. 335 * Note that filters must _never_ set this flag, as another filter 336 * in the list may have previously cleared it. 337 */ 338 /* 339 * let ipfilter look at packet on the wire, 340 * not the decapsulated packet. 341 */ 342 #if defined(IPSEC) 343 if (!ipsec_used || !ipsec_indone(m)) 344 #else 345 if (1) 346 #endif 347 { 348 struct in6_addr odst; 349 350 odst = ip6->ip6_dst; 351 if (pfil_run_hooks(inet6_pfil_hook, &m, rcvif, 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) { 363 SOFTNET_LOCK(); 364 if ((*altq_input)(m, AF_INET6) == 0) { 365 SOFTNET_UNLOCK(); 366 /* packet is dropped by traffic conditioner */ 367 return; 368 } 369 SOFTNET_UNLOCK(); 370 } 371 #endif 372 373 /* 374 * Check against address spoofing/corruption. 375 */ 376 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) || 377 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) { 378 /* 379 * XXX: "badscope" is not very suitable for a multicast source. 380 */ 381 IP6_STATINC(IP6_STAT_BADSCOPE); 382 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 383 goto bad; 384 } 385 /* 386 * The following check is not documented in specs. A malicious 387 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack 388 * and bypass security checks (act as if it was from 127.0.0.1 by using 389 * IPv6 src ::ffff:127.0.0.1). Be cautious. 390 * 391 * This check chokes if we are in an SIIT cloud. As none of BSDs 392 * support IPv4-less kernel compilation, we cannot support SIIT 393 * environment at all. So, it makes more sense for us to reject any 394 * malicious packets for non-SIIT environment, than try to do a 395 * partial support for SIIT environment. 396 */ 397 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 398 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 399 IP6_STATINC(IP6_STAT_BADSCOPE); 400 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 401 goto bad; 402 } 403 #if 0 404 /* 405 * Reject packets with IPv4 compatible addresses (auto tunnel). 406 * 407 * The code forbids auto tunnel relay case in RFC1933 (the check is 408 * stronger than RFC1933). We may want to re-enable it if mech-xx 409 * is revised to forbid relaying case. 410 */ 411 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) || 412 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) { 413 IP6_STATINC(IP6_STAT_BADSCOPE); 414 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 415 goto bad; 416 } 417 #endif 418 419 /* 420 * Disambiguate address scope zones (if there is ambiguity). 421 * We first make sure that the original source or destination address 422 * is not in our internal form for scoped addresses. Such addresses 423 * are not necessarily invalid spec-wise, but we cannot accept them due 424 * to the usage conflict. 425 * in6_setscope() then also checks and rejects the cases where src or 426 * dst are the loopback address and the receiving interface 427 * is not loopback. 428 */ 429 if (__predict_false( 430 m_makewritable(&m, 0, sizeof(struct ip6_hdr), M_DONTWAIT))) 431 goto bad; 432 ip6 = mtod(m, struct ip6_hdr *); 433 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) { 434 IP6_STATINC(IP6_STAT_BADSCOPE); /* XXX */ 435 goto bad; 436 } 437 if (in6_setscope(&ip6->ip6_src, rcvif, NULL) || 438 in6_setscope(&ip6->ip6_dst, rcvif, NULL)) { 439 IP6_STATINC(IP6_STAT_BADSCOPE); 440 goto bad; 441 } 442 443 ro = percpu_getref(ip6_forward_rt_percpu); 444 /* 445 * Multicast check 446 */ 447 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 448 bool ingroup; 449 450 in6_ifstat_inc(rcvif, ifs6_in_mcast); 451 /* 452 * See if we belong to the destination multicast group on the 453 * arrival interface. 454 */ 455 ingroup = in6_multi_group(&ip6->ip6_dst, rcvif); 456 if (ingroup) 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(rcvif, ifs6_in_discard); 464 goto bad_unref; 465 } 466 deliverifp = 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(ro, &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 #if 0 495 /* 496 * The check below is redundant since the comparison of 497 * the destination and the key of the rtentry has 498 * already done through looking up the routing table. 499 */ 500 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &rt6_getkey(rt)->sin6_addr) && 501 #endif 502 rt->rt_ifp->if_type == IFT_LOOP) { 503 struct in6_ifaddr *ia6 = (struct in6_ifaddr *)rt->rt_ifa; 504 int addrok; 505 506 if (ia6->ia6_flags & IN6_IFF_ANYCAST) 507 m->m_flags |= M_ANYCAST6; 508 /* 509 * packets to a tentative, duplicated, or somehow invalid 510 * address must not be accepted. 511 */ 512 if (ia6->ia6_flags & IN6_IFF_NOTREADY) 513 addrok = 0; 514 else if (ia6->ia6_flags & IN6_IFF_DETACHED && 515 !IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) 516 { 517 /* Allow internal traffic to DETACHED addresses */ 518 struct sockaddr_in6 sin6; 519 int s; 520 521 memset(&sin6, 0, sizeof(sin6)); 522 sin6.sin6_family = AF_INET6; 523 sin6.sin6_len = sizeof(sin6); 524 sin6.sin6_addr = ip6->ip6_src; 525 s = pserialize_read_enter(); 526 addrok = (ifa_ifwithaddr(sin6tosa(&sin6)) != NULL); 527 pserialize_read_exit(s); 528 } else 529 addrok = 1; 530 if (addrok) { 531 /* this address is ready */ 532 ours = 1; 533 deliverifp = ia6->ia_ifp; /* correct? */ 534 goto hbhcheck; 535 } else { 536 /* address is not ready, so discard the packet. */ 537 char ip6bufs[INET6_ADDRSTRLEN]; 538 char ip6bufd[INET6_ADDRSTRLEN]; 539 nd6log(LOG_INFO, "packet to an unready address %s->%s\n", 540 IN6_PRINT(ip6bufs, &ip6->ip6_src), 541 IN6_PRINT(ip6bufd, &ip6->ip6_dst)); 542 543 goto bad_unref; 544 } 545 } 546 547 /* 548 * FAITH (Firewall Aided Internet Translator) 549 */ 550 #if defined(NFAITH) && 0 < NFAITH 551 if (ip6_keepfaith) { 552 if (rt != NULL && rt->rt_ifp != NULL && 553 rt->rt_ifp->if_type == IFT_FAITH) { 554 /* XXX do we need more sanity checks? */ 555 ours = 1; 556 deliverifp = rt->rt_ifp; /* faith */ 557 goto hbhcheck; 558 } 559 } 560 #endif 561 562 #if 0 563 { 564 /* 565 * Last resort: check in6_ifaddr for incoming interface. 566 * The code is here until I update the "goto ours hack" code above 567 * working right. 568 */ 569 struct ifaddr *ifa; 570 IFADDR_READER_FOREACH(ifa, rcvif) { 571 if (ifa->ifa_addr->sa_family != AF_INET6) 572 continue; 573 if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) { 574 ours = 1; 575 deliverifp = ifa->ifa_ifp; 576 goto hbhcheck; 577 } 578 } 579 } 580 #endif 581 582 /* 583 * Now there is no reason to process the packet if it's not our own 584 * and we're not a router. 585 */ 586 if (!ip6_forwarding) { 587 IP6_STATINC(IP6_STAT_CANTFORWARD); 588 in6_ifstat_inc(rcvif, ifs6_in_discard); 589 goto bad_unref; 590 } 591 592 hbhcheck: 593 /* 594 * record address information into m_tag, if we don't have one yet. 595 * note that we are unable to record it, if the address is not listed 596 * as our interface address (e.g. multicast addresses, addresses 597 * within FAITH prefixes and such). 598 */ 599 if (deliverifp && ip6_getdstifaddr(m) == NULL) { 600 struct in6_ifaddr *ia6; 601 int s = pserialize_read_enter(); 602 603 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 604 /* Depends on ip6_setdstifaddr never sleep */ 605 if (ia6 != NULL && ip6_setdstifaddr(m, ia6) == NULL) { 606 /* 607 * XXX maybe we should drop the packet here, 608 * as we could not provide enough information 609 * to the upper layers. 610 */ 611 } 612 pserialize_read_exit(s); 613 } 614 615 /* 616 * Process Hop-by-Hop options header if it's contained. 617 * m may be modified in ip6_hopopts_input(). 618 * If a JumboPayload option is included, plen will also be modified. 619 */ 620 plen = (u_int32_t)ntohs(ip6->ip6_plen); 621 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 622 struct ip6_hbh *hbh; 623 624 if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) { 625 #if 0 /*touches NULL pointer*/ 626 in6_ifstat_inc(rcvif, ifs6_in_discard); 627 #endif 628 rtcache_unref(rt, ro); 629 percpu_putref(ip6_forward_rt_percpu); 630 return; /* m have already been freed */ 631 } 632 633 /* adjust pointer */ 634 ip6 = mtod(m, struct ip6_hdr *); 635 636 /* 637 * if the payload length field is 0 and the next header field 638 * indicates Hop-by-Hop Options header, then a Jumbo Payload 639 * option MUST be included. 640 */ 641 if (ip6->ip6_plen == 0 && plen == 0) { 642 /* 643 * Note that if a valid jumbo payload option is 644 * contained, ip6_hopopts_input() must set a valid 645 * (non-zero) payload length to the variable plen. 646 */ 647 IP6_STATINC(IP6_STAT_BADOPTIONS); 648 in6_ifstat_inc(rcvif, ifs6_in_discard); 649 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 650 icmp6_error(m, ICMP6_PARAM_PROB, 651 ICMP6_PARAMPROB_HEADER, 652 (char *)&ip6->ip6_plen - (char *)ip6); 653 rtcache_unref(rt, ro); 654 percpu_putref(ip6_forward_rt_percpu); 655 return; 656 } 657 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 658 sizeof(struct ip6_hbh)); 659 if (hbh == NULL) { 660 IP6_STATINC(IP6_STAT_TOOSHORT); 661 rtcache_unref(rt, ro); 662 percpu_putref(ip6_forward_rt_percpu); 663 return; 664 } 665 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 666 nxt = hbh->ip6h_nxt; 667 668 /* 669 * accept the packet if a router alert option is included 670 * and we act as an IPv6 router. 671 */ 672 if (rtalert != ~0 && ip6_forwarding) 673 ours = 1; 674 } else 675 nxt = ip6->ip6_nxt; 676 677 /* 678 * Check that the amount of data in the buffers 679 * is as at least much as the IPv6 header would have us expect. 680 * Trim mbufs if longer than we expect. 681 * Drop packet if shorter than we expect. 682 */ 683 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 684 IP6_STATINC(IP6_STAT_TOOSHORT); 685 in6_ifstat_inc(rcvif, ifs6_in_truncated); 686 goto bad_unref; 687 } 688 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 689 if (m->m_len == m->m_pkthdr.len) { 690 m->m_len = sizeof(struct ip6_hdr) + plen; 691 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 692 } else 693 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 694 } 695 696 /* 697 * Forward if desirable. 698 */ 699 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 700 /* 701 * If we are acting as a multicast router, all 702 * incoming multicast packets are passed to the 703 * kernel-level multicast forwarding function. 704 * The packet is returned (relatively) intact; if 705 * ip6_mforward() returns a non-zero value, the packet 706 * must be discarded, else it may be accepted below. 707 */ 708 if (ip6_mrouter != NULL) { 709 int error; 710 711 SOFTNET_LOCK(); 712 error = ip6_mforward(ip6, rcvif, m); 713 SOFTNET_UNLOCK(); 714 715 if (error != 0) { 716 rtcache_unref(rt, ro); 717 percpu_putref(ip6_forward_rt_percpu); 718 IP6_STATINC(IP6_STAT_CANTFORWARD); 719 goto bad; 720 } 721 } 722 if (!ours) 723 goto bad_unref; 724 } else if (!ours) { 725 rtcache_unref(rt, ro); 726 percpu_putref(ip6_forward_rt_percpu); 727 ip6_forward(m, srcrt); 728 return; 729 } 730 731 ip6 = mtod(m, struct ip6_hdr *); 732 733 /* 734 * Malicious party may be able to use IPv4 mapped addr to confuse 735 * tcp/udp stack and bypass security checks (act as if it was from 736 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious. 737 * 738 * For SIIT end node behavior, you may want to disable the check. 739 * However, you will become vulnerable to attacks using IPv4 mapped 740 * source. 741 */ 742 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 743 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 744 IP6_STATINC(IP6_STAT_BADSCOPE); 745 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 746 goto bad_unref; 747 } 748 749 /* 750 * Tell launch routine the next header 751 */ 752 #ifdef IFA_STATS 753 if (deliverifp != NULL) { 754 struct in6_ifaddr *ia6; 755 int s = pserialize_read_enter(); 756 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 757 if (ia6) 758 ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len; 759 pserialize_read_exit(s); 760 } 761 #endif 762 IP6_STATINC(IP6_STAT_DELIVERED); 763 in6_ifstat_inc(deliverifp, ifs6_in_deliver); 764 nest = 0; 765 766 if (rt != NULL) { 767 rtcache_unref(rt, ro); 768 rt = NULL; 769 } 770 percpu_putref(ip6_forward_rt_percpu); 771 772 rh_present = 0; 773 while (nxt != IPPROTO_DONE) { 774 if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) { 775 IP6_STATINC(IP6_STAT_TOOMANYHDR); 776 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 777 goto bad; 778 } 779 780 /* 781 * protection against faulty packet - there should be 782 * more sanity checks in header chain processing. 783 */ 784 if (m->m_pkthdr.len < off) { 785 IP6_STATINC(IP6_STAT_TOOSHORT); 786 in6_ifstat_inc(rcvif, ifs6_in_truncated); 787 goto bad; 788 } 789 790 if (nxt == IPPROTO_ROUTING) { 791 if (rh_present++) { 792 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 793 IP6_STATINC(IP6_STAT_BADOPTIONS); 794 goto bad; 795 } 796 } 797 798 #ifdef IPSEC 799 if (ipsec_used) { 800 /* 801 * enforce IPsec policy checking if we are seeing last 802 * header. note that we do not visit this with 803 * protocols with pcb layer code - like udp/tcp/raw ip. 804 */ 805 if ((inet6sw[ip_protox[nxt]].pr_flags 806 & PR_LASTHDR) != 0) { 807 int error; 808 809 error = ipsec6_input(m); 810 if (error) 811 goto bad; 812 } 813 } 814 #endif /* IPSEC */ 815 816 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt); 817 } 818 return; 819 820 bad_unref: 821 rtcache_unref(rt, ro); 822 percpu_putref(ip6_forward_rt_percpu); 823 bad: 824 m_freem(m); 825 return; 826 } 827 828 /* 829 * set/grab in6_ifaddr correspond to IPv6 destination address. 830 */ 831 static struct m_tag * 832 ip6_setdstifaddr(struct mbuf *m, const struct in6_ifaddr *ia) 833 { 834 struct m_tag *mtag; 835 struct ip6aux *ip6a; 836 837 mtag = ip6_addaux(m); 838 if (mtag == NULL) 839 return NULL; 840 841 ip6a = (struct ip6aux *)(mtag + 1); 842 if (in6_setscope(&ip6a->ip6a_src, ia->ia_ifp, &ip6a->ip6a_scope_id)) { 843 IP6_STATINC(IP6_STAT_BADSCOPE); 844 return NULL; 845 } 846 847 ip6a->ip6a_src = ia->ia_addr.sin6_addr; 848 ip6a->ip6a_flags = ia->ia6_flags; 849 return mtag; 850 } 851 852 const struct ip6aux * 853 ip6_getdstifaddr(struct mbuf *m) 854 { 855 struct m_tag *mtag; 856 857 mtag = ip6_findaux(m); 858 if (mtag != NULL) 859 return (struct ip6aux *)(mtag + 1); 860 else 861 return NULL; 862 } 863 864 /* 865 * Hop-by-Hop options header processing. If a valid jumbo payload option is 866 * included, the real payload length will be stored in plenp. 867 * 868 * rtalertp - XXX: should be stored more smart way 869 */ 870 int 871 ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp, 872 struct mbuf **mp, int *offp) 873 { 874 struct mbuf *m = *mp; 875 int off = *offp, hbhlen; 876 struct ip6_hbh *hbh; 877 878 /* validation of the length of the header */ 879 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, 880 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh)); 881 if (hbh == NULL) { 882 IP6_STATINC(IP6_STAT_TOOSHORT); 883 return -1; 884 } 885 hbhlen = (hbh->ip6h_len + 1) << 3; 886 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 887 hbhlen); 888 if (hbh == NULL) { 889 IP6_STATINC(IP6_STAT_TOOSHORT); 890 return -1; 891 } 892 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 893 off += hbhlen; 894 hbhlen -= sizeof(struct ip6_hbh); 895 896 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 897 hbhlen, rtalertp, plenp) < 0) 898 return (-1); 899 900 *offp = off; 901 *mp = m; 902 return (0); 903 } 904 905 /* 906 * Search header for all Hop-by-hop options and process each option. 907 * This function is separate from ip6_hopopts_input() in order to 908 * handle a case where the sending node itself process its hop-by-hop 909 * options header. In such a case, the function is called from ip6_output(). 910 * 911 * The function assumes that hbh header is located right after the IPv6 header 912 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to 913 * opthead + hbhlen is located in continuous memory region. 914 */ 915 static int 916 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen, 917 u_int32_t *rtalertp, u_int32_t *plenp) 918 { 919 struct ip6_hdr *ip6; 920 int optlen = 0; 921 u_int8_t *opt = opthead; 922 u_int16_t rtalert_val; 923 u_int32_t jumboplen; 924 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh); 925 926 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 927 switch (*opt) { 928 case IP6OPT_PAD1: 929 optlen = 1; 930 break; 931 case IP6OPT_PADN: 932 if (hbhlen < IP6OPT_MINLEN) { 933 IP6_STATINC(IP6_STAT_TOOSMALL); 934 goto bad; 935 } 936 optlen = *(opt + 1) + 2; 937 break; 938 case IP6OPT_RTALERT: 939 /* XXX may need check for alignment */ 940 if (hbhlen < IP6OPT_RTALERT_LEN) { 941 IP6_STATINC(IP6_STAT_TOOSMALL); 942 goto bad; 943 } 944 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) { 945 /* XXX stat */ 946 icmp6_error(m, ICMP6_PARAM_PROB, 947 ICMP6_PARAMPROB_HEADER, 948 erroff + opt + 1 - opthead); 949 return (-1); 950 } 951 optlen = IP6OPT_RTALERT_LEN; 952 memcpy((void *)&rtalert_val, (void *)(opt + 2), 2); 953 *rtalertp = ntohs(rtalert_val); 954 break; 955 case IP6OPT_JUMBO: 956 /* XXX may need check for alignment */ 957 if (hbhlen < IP6OPT_JUMBO_LEN) { 958 IP6_STATINC(IP6_STAT_TOOSMALL); 959 goto bad; 960 } 961 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) { 962 /* XXX stat */ 963 icmp6_error(m, ICMP6_PARAM_PROB, 964 ICMP6_PARAMPROB_HEADER, 965 erroff + opt + 1 - opthead); 966 return (-1); 967 } 968 optlen = IP6OPT_JUMBO_LEN; 969 970 /* 971 * IPv6 packets that have non 0 payload length 972 * must not contain a jumbo payload option. 973 */ 974 ip6 = mtod(m, struct ip6_hdr *); 975 if (ip6->ip6_plen) { 976 IP6_STATINC(IP6_STAT_BADOPTIONS); 977 icmp6_error(m, ICMP6_PARAM_PROB, 978 ICMP6_PARAMPROB_HEADER, 979 erroff + opt - opthead); 980 return (-1); 981 } 982 983 /* 984 * We may see jumbolen in unaligned location, so 985 * we'd need to perform bcopy(). 986 */ 987 memcpy(&jumboplen, opt + 2, sizeof(jumboplen)); 988 jumboplen = (u_int32_t)htonl(jumboplen); 989 990 #if 1 991 /* 992 * if there are multiple jumbo payload options, 993 * *plenp will be non-zero and the packet will be 994 * rejected. 995 * the behavior may need some debate in ipngwg - 996 * multiple options does not make sense, however, 997 * there's no explicit mention in specification. 998 */ 999 if (*plenp != 0) { 1000 IP6_STATINC(IP6_STAT_BADOPTIONS); 1001 icmp6_error(m, ICMP6_PARAM_PROB, 1002 ICMP6_PARAMPROB_HEADER, 1003 erroff + opt + 2 - opthead); 1004 return (-1); 1005 } 1006 #endif 1007 1008 /* 1009 * jumbo payload length must be larger than 65535. 1010 */ 1011 if (jumboplen <= IPV6_MAXPACKET) { 1012 IP6_STATINC(IP6_STAT_BADOPTIONS); 1013 icmp6_error(m, ICMP6_PARAM_PROB, 1014 ICMP6_PARAMPROB_HEADER, 1015 erroff + opt + 2 - opthead); 1016 return (-1); 1017 } 1018 *plenp = jumboplen; 1019 1020 break; 1021 default: /* unknown option */ 1022 if (hbhlen < IP6OPT_MINLEN) { 1023 IP6_STATINC(IP6_STAT_TOOSMALL); 1024 goto bad; 1025 } 1026 optlen = ip6_unknown_opt(opt, m, 1027 erroff + opt - opthead); 1028 if (optlen == -1) 1029 return (-1); 1030 optlen += 2; 1031 break; 1032 } 1033 } 1034 1035 return (0); 1036 1037 bad: 1038 m_freem(m); 1039 return (-1); 1040 } 1041 1042 /* 1043 * Unknown option processing. 1044 * The third argument `off' is the offset from the IPv6 header to the option, 1045 * which is necessary if the IPv6 header the and option header and IPv6 header 1046 * is not continuous in order to return an ICMPv6 error. 1047 */ 1048 int 1049 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off) 1050 { 1051 struct ip6_hdr *ip6; 1052 1053 switch (IP6OPT_TYPE(*optp)) { 1054 case IP6OPT_TYPE_SKIP: /* ignore the option */ 1055 return ((int)*(optp + 1)); 1056 case IP6OPT_TYPE_DISCARD: /* silently discard */ 1057 m_freem(m); 1058 return (-1); 1059 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 1060 IP6_STATINC(IP6_STAT_BADOPTIONS); 1061 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 1062 return (-1); 1063 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 1064 IP6_STATINC(IP6_STAT_BADOPTIONS); 1065 ip6 = mtod(m, struct ip6_hdr *); 1066 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 1067 (m->m_flags & (M_BCAST|M_MCAST))) 1068 m_freem(m); 1069 else 1070 icmp6_error(m, ICMP6_PARAM_PROB, 1071 ICMP6_PARAMPROB_OPTION, off); 1072 return (-1); 1073 } 1074 1075 m_freem(m); /* XXX: NOTREACHED */ 1076 return (-1); 1077 } 1078 1079 /* 1080 * Create the "control" list for this pcb. 1081 * 1082 * The routine will be called from upper layer handlers like tcp6_input(). 1083 * Thus the routine assumes that the caller (tcp6_input) have already 1084 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the 1085 * very first mbuf on the mbuf chain. 1086 * We may want to add some infinite loop prevention or sanity checks for safety. 1087 * (This applies only when you are using KAME mbuf chain restriction, i.e. 1088 * you are using IP6_EXTHDR_CHECK() not m_pulldown()) 1089 */ 1090 void 1091 ip6_savecontrol(struct in6pcb *in6p, struct mbuf **mp, 1092 struct ip6_hdr *ip6, struct mbuf *m) 1093 { 1094 struct socket *so = in6p->in6p_socket; 1095 #ifdef RFC2292 1096 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y)) 1097 #else 1098 #define IS2292(x, y) (y) 1099 #endif 1100 1101 if (SOOPT_TIMESTAMP(so->so_options)) 1102 mp = sbsavetimestamp(so->so_options, m, mp); 1103 1104 /* some OSes call this logic with IPv4 packet, for SO_TIMESTAMP */ 1105 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) 1106 return; 1107 1108 /* RFC 2292 sec. 5 */ 1109 if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) { 1110 struct in6_pktinfo pi6; 1111 1112 memcpy(&pi6.ipi6_addr, &ip6->ip6_dst, sizeof(struct in6_addr)); 1113 in6_clearscope(&pi6.ipi6_addr); /* XXX */ 1114 pi6.ipi6_ifindex = m->m_pkthdr.rcvif_index; 1115 *mp = sbcreatecontrol(&pi6, sizeof(pi6), 1116 IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6); 1117 if (*mp) 1118 mp = &(*mp)->m_next; 1119 } 1120 1121 if (in6p->in6p_flags & IN6P_HOPLIMIT) { 1122 int hlim = ip6->ip6_hlim & 0xff; 1123 1124 *mp = sbcreatecontrol(&hlim, sizeof(hlim), 1125 IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6); 1126 if (*mp) 1127 mp = &(*mp)->m_next; 1128 } 1129 1130 if ((in6p->in6p_flags & IN6P_TCLASS) != 0) { 1131 u_int32_t flowinfo; 1132 int tclass; 1133 1134 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK); 1135 flowinfo >>= 20; 1136 1137 tclass = flowinfo & 0xff; 1138 *mp = sbcreatecontrol(&tclass, sizeof(tclass), 1139 IPV6_TCLASS, IPPROTO_IPV6); 1140 1141 if (*mp) 1142 mp = &(*mp)->m_next; 1143 } 1144 1145 /* 1146 * IPV6_HOPOPTS socket option. Recall that we required super-user 1147 * privilege for the option (see ip6_ctloutput), but it might be too 1148 * strict, since there might be some hop-by-hop options which can be 1149 * returned to normal user. 1150 * See also RFC3542 section 8 (or RFC2292 section 6). 1151 */ 1152 if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0) { 1153 /* 1154 * Check if a hop-by-hop options header is contatined in the 1155 * received packet, and if so, store the options as ancillary 1156 * data. Note that a hop-by-hop options header must be 1157 * just after the IPv6 header, which fact is assured through 1158 * the IPv6 input processing. 1159 */ 1160 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1161 if (xip6->ip6_nxt == IPPROTO_HOPOPTS) { 1162 struct ip6_hbh *hbh; 1163 int hbhlen; 1164 struct mbuf *ext; 1165 1166 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr), 1167 xip6->ip6_nxt); 1168 if (ext == NULL) { 1169 IP6_STATINC(IP6_STAT_TOOSHORT); 1170 return; 1171 } 1172 hbh = mtod(ext, struct ip6_hbh *); 1173 hbhlen = (hbh->ip6h_len + 1) << 3; 1174 if (hbhlen != ext->m_len) { 1175 m_freem(ext); 1176 IP6_STATINC(IP6_STAT_TOOSHORT); 1177 return; 1178 } 1179 1180 /* 1181 * XXX: We copy whole the header even if a jumbo 1182 * payload option is included, which option is to 1183 * be removed before returning in the RFC 2292. 1184 * Note: this constraint is removed in RFC3542. 1185 */ 1186 *mp = sbcreatecontrol(hbh, hbhlen, 1187 IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS), 1188 IPPROTO_IPV6); 1189 if (*mp) 1190 mp = &(*mp)->m_next; 1191 m_freem(ext); 1192 } 1193 } 1194 1195 /* IPV6_DSTOPTS and IPV6_RTHDR socket options */ 1196 if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) { 1197 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1198 int nxt = xip6->ip6_nxt, off = sizeof(struct ip6_hdr); 1199 1200 /* 1201 * Search for destination options headers or routing 1202 * header(s) through the header chain, and stores each 1203 * header as ancillary data. 1204 * Note that the order of the headers remains in 1205 * the chain of ancillary data. 1206 */ 1207 for (;;) { /* is explicit loop prevention necessary? */ 1208 struct ip6_ext *ip6e = NULL; 1209 int elen; 1210 struct mbuf *ext = NULL; 1211 1212 /* 1213 * if it is not an extension header, don't try to 1214 * pull it from the chain. 1215 */ 1216 switch (nxt) { 1217 case IPPROTO_DSTOPTS: 1218 case IPPROTO_ROUTING: 1219 case IPPROTO_HOPOPTS: 1220 case IPPROTO_AH: /* is it possible? */ 1221 break; 1222 default: 1223 goto loopend; 1224 } 1225 1226 ext = ip6_pullexthdr(m, off, nxt); 1227 if (ext == NULL) { 1228 IP6_STATINC(IP6_STAT_TOOSHORT); 1229 return; 1230 } 1231 ip6e = mtod(ext, struct ip6_ext *); 1232 if (nxt == IPPROTO_AH) 1233 elen = (ip6e->ip6e_len + 2) << 2; 1234 else 1235 elen = (ip6e->ip6e_len + 1) << 3; 1236 if (elen != ext->m_len) { 1237 m_freem(ext); 1238 IP6_STATINC(IP6_STAT_TOOSHORT); 1239 return; 1240 } 1241 KASSERT(IP6_HDR_ALIGNED_P(ip6e)); 1242 1243 switch (nxt) { 1244 case IPPROTO_DSTOPTS: 1245 if (!(in6p->in6p_flags & IN6P_DSTOPTS)) 1246 break; 1247 1248 *mp = sbcreatecontrol(ip6e, elen, 1249 IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS), 1250 IPPROTO_IPV6); 1251 if (*mp) 1252 mp = &(*mp)->m_next; 1253 break; 1254 1255 case IPPROTO_ROUTING: 1256 if (!(in6p->in6p_flags & IN6P_RTHDR)) 1257 break; 1258 1259 *mp = sbcreatecontrol(ip6e, elen, 1260 IS2292(IPV6_2292RTHDR, IPV6_RTHDR), 1261 IPPROTO_IPV6); 1262 if (*mp) 1263 mp = &(*mp)->m_next; 1264 break; 1265 1266 case IPPROTO_HOPOPTS: 1267 case IPPROTO_AH: /* is it possible? */ 1268 break; 1269 1270 default: 1271 /* 1272 * other cases have been filtered in the above. 1273 * none will visit this case. here we supply 1274 * the code just in case (nxt overwritten or 1275 * other cases). 1276 */ 1277 m_freem(ext); 1278 goto loopend; 1279 1280 } 1281 1282 /* proceed with the next header. */ 1283 off += elen; 1284 nxt = ip6e->ip6e_nxt; 1285 ip6e = NULL; 1286 m_freem(ext); 1287 ext = NULL; 1288 } 1289 loopend: 1290 ; 1291 } 1292 } 1293 #undef IS2292 1294 1295 1296 void 1297 ip6_notify_pmtu(struct in6pcb *in6p, const struct sockaddr_in6 *dst, 1298 uint32_t *mtu) 1299 { 1300 struct socket *so; 1301 struct mbuf *m_mtu; 1302 struct ip6_mtuinfo mtuctl; 1303 1304 so = in6p->in6p_socket; 1305 1306 if (mtu == NULL) 1307 return; 1308 1309 KASSERT(so != NULL); 1310 1311 memset(&mtuctl, 0, sizeof(mtuctl)); /* zero-clear for safety */ 1312 mtuctl.ip6m_mtu = *mtu; 1313 mtuctl.ip6m_addr = *dst; 1314 if (sa6_recoverscope(&mtuctl.ip6m_addr)) 1315 return; 1316 1317 if ((m_mtu = sbcreatecontrol(&mtuctl, sizeof(mtuctl), 1318 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL) 1319 return; 1320 1321 if (sbappendaddr(&so->so_rcv, (const struct sockaddr *)dst, NULL, m_mtu) 1322 == 0) { 1323 m_freem(m_mtu); 1324 /* XXX: should count statistics */ 1325 } else 1326 sorwakeup(so); 1327 1328 return; 1329 } 1330 1331 /* 1332 * pull single extension header from mbuf chain. returns single mbuf that 1333 * contains the result, or NULL on error. 1334 */ 1335 static struct mbuf * 1336 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt) 1337 { 1338 struct ip6_ext ip6e; 1339 size_t elen; 1340 struct mbuf *n; 1341 1342 #ifdef DIAGNOSTIC 1343 switch (nxt) { 1344 case IPPROTO_DSTOPTS: 1345 case IPPROTO_ROUTING: 1346 case IPPROTO_HOPOPTS: 1347 case IPPROTO_AH: /* is it possible? */ 1348 break; 1349 default: 1350 printf("ip6_pullexthdr: invalid nxt=%d\n", nxt); 1351 } 1352 #endif 1353 1354 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1355 if (nxt == IPPROTO_AH) 1356 elen = (ip6e.ip6e_len + 2) << 2; 1357 else 1358 elen = (ip6e.ip6e_len + 1) << 3; 1359 1360 MGET(n, M_DONTWAIT, MT_DATA); 1361 if (n && elen >= MLEN) { 1362 MCLGET(n, M_DONTWAIT); 1363 if ((n->m_flags & M_EXT) == 0) { 1364 m_free(n); 1365 n = NULL; 1366 } 1367 } 1368 if (!n) 1369 return NULL; 1370 1371 n->m_len = 0; 1372 if (elen >= M_TRAILINGSPACE(n)) { 1373 m_free(n); 1374 return NULL; 1375 } 1376 1377 m_copydata(m, off, elen, mtod(n, void *)); 1378 n->m_len = elen; 1379 return n; 1380 } 1381 1382 /* 1383 * Get pointer to the previous header followed by the header 1384 * currently processed. 1385 * XXX: This function supposes that 1386 * M includes all headers, 1387 * the next header field and the header length field of each header 1388 * are valid, and 1389 * the sum of each header length equals to OFF. 1390 * Because of these assumptions, this function must be called very 1391 * carefully. Moreover, it will not be used in the near future when 1392 * we develop `neater' mechanism to process extension headers. 1393 */ 1394 u_int8_t * 1395 ip6_get_prevhdr(struct mbuf *m, int off) 1396 { 1397 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1398 1399 if (off == sizeof(struct ip6_hdr)) 1400 return (&ip6->ip6_nxt); 1401 else { 1402 int len, nxt; 1403 struct ip6_ext *ip6e = NULL; 1404 1405 nxt = ip6->ip6_nxt; 1406 len = sizeof(struct ip6_hdr); 1407 while (len < off) { 1408 ip6e = (struct ip6_ext *)(mtod(m, char *) + len); 1409 1410 switch (nxt) { 1411 case IPPROTO_FRAGMENT: 1412 len += sizeof(struct ip6_frag); 1413 break; 1414 case IPPROTO_AH: 1415 len += (ip6e->ip6e_len + 2) << 2; 1416 break; 1417 default: 1418 len += (ip6e->ip6e_len + 1) << 3; 1419 break; 1420 } 1421 nxt = ip6e->ip6e_nxt; 1422 } 1423 if (ip6e) 1424 return (&ip6e->ip6e_nxt); 1425 else 1426 return NULL; 1427 } 1428 } 1429 1430 /* 1431 * get next header offset. m will be retained. 1432 */ 1433 int 1434 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp) 1435 { 1436 struct ip6_hdr ip6; 1437 struct ip6_ext ip6e; 1438 struct ip6_frag fh; 1439 1440 /* just in case */ 1441 if (m == NULL) 1442 panic("ip6_nexthdr: m == NULL"); 1443 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off) 1444 return -1; 1445 1446 switch (proto) { 1447 case IPPROTO_IPV6: 1448 /* do not chase beyond intermediate IPv6 headers */ 1449 if (off != 0) 1450 return -1; 1451 if (m->m_pkthdr.len < off + sizeof(ip6)) 1452 return -1; 1453 m_copydata(m, off, sizeof(ip6), (void *)&ip6); 1454 if (nxtp) 1455 *nxtp = ip6.ip6_nxt; 1456 off += sizeof(ip6); 1457 return off; 1458 1459 case IPPROTO_FRAGMENT: 1460 /* 1461 * terminate parsing if it is not the first fragment, 1462 * it does not make sense to parse through it. 1463 */ 1464 if (m->m_pkthdr.len < off + sizeof(fh)) 1465 return -1; 1466 m_copydata(m, off, sizeof(fh), (void *)&fh); 1467 if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0) 1468 return -1; 1469 if (nxtp) 1470 *nxtp = fh.ip6f_nxt; 1471 off += sizeof(struct ip6_frag); 1472 return off; 1473 1474 case IPPROTO_AH: 1475 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1476 return -1; 1477 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1478 if (nxtp) 1479 *nxtp = ip6e.ip6e_nxt; 1480 off += (ip6e.ip6e_len + 2) << 2; 1481 if (m->m_pkthdr.len < off) 1482 return -1; 1483 return off; 1484 1485 case IPPROTO_HOPOPTS: 1486 case IPPROTO_ROUTING: 1487 case IPPROTO_DSTOPTS: 1488 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1489 return -1; 1490 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1491 if (nxtp) 1492 *nxtp = ip6e.ip6e_nxt; 1493 off += (ip6e.ip6e_len + 1) << 3; 1494 if (m->m_pkthdr.len < off) 1495 return -1; 1496 return off; 1497 1498 case IPPROTO_NONE: 1499 case IPPROTO_ESP: 1500 case IPPROTO_IPCOMP: 1501 /* give up */ 1502 return -1; 1503 1504 default: 1505 return -1; 1506 } 1507 } 1508 1509 /* 1510 * get offset for the last header in the chain. m will be kept untainted. 1511 */ 1512 int 1513 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp) 1514 { 1515 int newoff; 1516 int nxt; 1517 1518 if (!nxtp) { 1519 nxt = -1; 1520 nxtp = &nxt; 1521 } 1522 for (;;) { 1523 newoff = ip6_nexthdr(m, off, proto, nxtp); 1524 if (newoff < 0) 1525 return off; 1526 else if (newoff < off) 1527 return -1; /* invalid */ 1528 else if (newoff == off) 1529 return newoff; 1530 1531 off = newoff; 1532 proto = *nxtp; 1533 } 1534 } 1535 1536 struct m_tag * 1537 ip6_addaux(struct mbuf *m) 1538 { 1539 struct m_tag *mtag; 1540 1541 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1542 if (!mtag) { 1543 mtag = m_tag_get(PACKET_TAG_INET6, sizeof(struct ip6aux), 1544 M_NOWAIT); 1545 if (mtag) { 1546 m_tag_prepend(m, mtag); 1547 memset(mtag + 1, 0, sizeof(struct ip6aux)); 1548 } 1549 } 1550 return mtag; 1551 } 1552 1553 struct m_tag * 1554 ip6_findaux(struct mbuf *m) 1555 { 1556 struct m_tag *mtag; 1557 1558 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1559 return mtag; 1560 } 1561 1562 void 1563 ip6_delaux(struct mbuf *m) 1564 { 1565 struct m_tag *mtag; 1566 1567 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1568 if (mtag) 1569 m_tag_delete(m, mtag); 1570 } 1571 1572 /* 1573 * System control for IP6 1574 */ 1575 1576 const u_char inet6ctlerrmap[PRC_NCMDS] = { 1577 0, 0, 0, 0, 1578 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 1579 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 1580 EMSGSIZE, EHOSTUNREACH, 0, 0, 1581 0, 0, 0, 0, 1582 ENOPROTOOPT 1583 }; 1584 1585 extern int sysctl_net_inet6_addrctlpolicy(SYSCTLFN_ARGS); 1586 1587 static int 1588 sysctl_net_inet6_ip6_stats(SYSCTLFN_ARGS) 1589 { 1590 1591 return (NETSTAT_SYSCTL(ip6stat_percpu, IP6_NSTATS)); 1592 } 1593 1594 static void 1595 sysctl_net_inet6_ip6_setup(struct sysctllog **clog) 1596 { 1597 #ifdef RFC2292 1598 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y)) 1599 #else 1600 #define IS2292(x, y) (y) 1601 #endif 1602 1603 sysctl_createv(clog, 0, NULL, NULL, 1604 CTLFLAG_PERMANENT, 1605 CTLTYPE_NODE, "inet6", 1606 SYSCTL_DESCR("PF_INET6 related settings"), 1607 NULL, 0, NULL, 0, 1608 CTL_NET, PF_INET6, CTL_EOL); 1609 sysctl_createv(clog, 0, NULL, NULL, 1610 CTLFLAG_PERMANENT, 1611 CTLTYPE_NODE, "ip6", 1612 SYSCTL_DESCR("IPv6 related settings"), 1613 NULL, 0, NULL, 0, 1614 CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_EOL); 1615 1616 sysctl_createv(clog, 0, NULL, NULL, 1617 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1618 CTLTYPE_INT, "forwarding", 1619 SYSCTL_DESCR("Enable forwarding of INET6 datagrams"), 1620 NULL, 0, &ip6_forwarding, 0, 1621 CTL_NET, PF_INET6, IPPROTO_IPV6, 1622 IPV6CTL_FORWARDING, CTL_EOL); 1623 sysctl_createv(clog, 0, NULL, NULL, 1624 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1625 CTLTYPE_INT, "redirect", 1626 SYSCTL_DESCR("Enable sending of ICMPv6 redirect messages"), 1627 NULL, 0, &ip6_sendredirects, 0, 1628 CTL_NET, PF_INET6, IPPROTO_IPV6, 1629 IPV6CTL_SENDREDIRECTS, CTL_EOL); 1630 sysctl_createv(clog, 0, NULL, NULL, 1631 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1632 CTLTYPE_INT, "hlim", 1633 SYSCTL_DESCR("Hop limit for an INET6 datagram"), 1634 NULL, 0, &ip6_defhlim, 0, 1635 CTL_NET, PF_INET6, IPPROTO_IPV6, 1636 IPV6CTL_DEFHLIM, CTL_EOL); 1637 #ifdef notyet 1638 sysctl_createv(clog, 0, NULL, NULL, 1639 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1640 CTLTYPE_INT, "mtu", NULL, 1641 NULL, 0, &, 0, 1642 CTL_NET, PF_INET6, IPPROTO_IPV6, 1643 IPV6CTL_DEFMTU, CTL_EOL); 1644 #endif 1645 #ifdef __no_idea__ 1646 sysctl_createv(clog, 0, NULL, NULL, 1647 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1648 CTLTYPE_INT, "forwsrcrt", NULL, 1649 NULL, 0, &?, 0, 1650 CTL_NET, PF_INET6, IPPROTO_IPV6, 1651 IPV6CTL_FORWSRCRT, CTL_EOL); 1652 sysctl_createv(clog, 0, NULL, NULL, 1653 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1654 CTLTYPE_STRUCT, "mrtstats", NULL, 1655 NULL, 0, &?, sizeof(?), 1656 CTL_NET, PF_INET6, IPPROTO_IPV6, 1657 IPV6CTL_MRTSTATS, CTL_EOL); 1658 sysctl_createv(clog, 0, NULL, NULL, 1659 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1660 CTLTYPE_?, "mrtproto", NULL, 1661 NULL, 0, &?, sizeof(?), 1662 CTL_NET, PF_INET6, IPPROTO_IPV6, 1663 IPV6CTL_MRTPROTO, CTL_EOL); 1664 #endif 1665 sysctl_createv(clog, 0, NULL, NULL, 1666 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1667 CTLTYPE_INT, "maxfragpackets", 1668 SYSCTL_DESCR("Maximum number of fragments to buffer " 1669 "for reassembly"), 1670 NULL, 0, &ip6_maxfragpackets, 0, 1671 CTL_NET, PF_INET6, IPPROTO_IPV6, 1672 IPV6CTL_MAXFRAGPACKETS, CTL_EOL); 1673 #ifdef __no_idea__ 1674 sysctl_createv(clog, 0, NULL, NULL, 1675 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1676 CTLTYPE_INT, "sourcecheck", NULL, 1677 NULL, 0, &?, 0, 1678 CTL_NET, PF_INET6, IPPROTO_IPV6, 1679 IPV6CTL_SOURCECHECK, CTL_EOL); 1680 sysctl_createv(clog, 0, NULL, NULL, 1681 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1682 CTLTYPE_INT, "sourcecheck_logint", NULL, 1683 NULL, 0, &?, 0, 1684 CTL_NET, PF_INET6, IPPROTO_IPV6, 1685 IPV6CTL_SOURCECHECK_LOGINT, CTL_EOL); 1686 #endif 1687 sysctl_createv(clog, 0, NULL, NULL, 1688 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1689 CTLTYPE_INT, "accept_rtadv", 1690 SYSCTL_DESCR("Accept router advertisements"), 1691 NULL, 0, &ip6_accept_rtadv, 0, 1692 CTL_NET, PF_INET6, IPPROTO_IPV6, 1693 IPV6CTL_ACCEPT_RTADV, CTL_EOL); 1694 sysctl_createv(clog, 0, NULL, NULL, 1695 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1696 CTLTYPE_INT, "rtadv_maxroutes", 1697 SYSCTL_DESCR("Maximum number of routes accepted via router advertisements"), 1698 NULL, 0, &ip6_rtadv_maxroutes, 0, 1699 CTL_NET, PF_INET6, IPPROTO_IPV6, 1700 IPV6CTL_RTADV_MAXROUTES, CTL_EOL); 1701 sysctl_createv(clog, 0, NULL, NULL, 1702 CTLFLAG_PERMANENT, 1703 CTLTYPE_INT, "rtadv_numroutes", 1704 SYSCTL_DESCR("Current number of routes accepted via router advertisements"), 1705 NULL, 0, &nd6_numroutes, 0, 1706 CTL_NET, PF_INET6, IPPROTO_IPV6, 1707 IPV6CTL_RTADV_NUMROUTES, CTL_EOL); 1708 sysctl_createv(clog, 0, NULL, NULL, 1709 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1710 CTLTYPE_INT, "keepfaith", 1711 SYSCTL_DESCR("Activate faith interface"), 1712 NULL, 0, &ip6_keepfaith, 0, 1713 CTL_NET, PF_INET6, IPPROTO_IPV6, 1714 IPV6CTL_KEEPFAITH, CTL_EOL); 1715 sysctl_createv(clog, 0, NULL, NULL, 1716 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1717 CTLTYPE_INT, "log_interval", 1718 SYSCTL_DESCR("Minumum interval between logging " 1719 "unroutable packets"), 1720 NULL, 0, &ip6_log_interval, 0, 1721 CTL_NET, PF_INET6, IPPROTO_IPV6, 1722 IPV6CTL_LOG_INTERVAL, CTL_EOL); 1723 sysctl_createv(clog, 0, NULL, NULL, 1724 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1725 CTLTYPE_INT, "hdrnestlimit", 1726 SYSCTL_DESCR("Maximum number of nested IPv6 headers"), 1727 NULL, 0, &ip6_hdrnestlimit, 0, 1728 CTL_NET, PF_INET6, IPPROTO_IPV6, 1729 IPV6CTL_HDRNESTLIMIT, CTL_EOL); 1730 sysctl_createv(clog, 0, NULL, NULL, 1731 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1732 CTLTYPE_INT, "dad_count", 1733 SYSCTL_DESCR("Number of Duplicate Address Detection " 1734 "probes to send"), 1735 NULL, 0, &ip6_dad_count, 0, 1736 CTL_NET, PF_INET6, IPPROTO_IPV6, 1737 IPV6CTL_DAD_COUNT, CTL_EOL); 1738 sysctl_createv(clog, 0, NULL, NULL, 1739 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1740 CTLTYPE_INT, "auto_flowlabel", 1741 SYSCTL_DESCR("Assign random IPv6 flow labels"), 1742 NULL, 0, &ip6_auto_flowlabel, 0, 1743 CTL_NET, PF_INET6, IPPROTO_IPV6, 1744 IPV6CTL_AUTO_FLOWLABEL, CTL_EOL); 1745 sysctl_createv(clog, 0, NULL, NULL, 1746 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1747 CTLTYPE_INT, "defmcasthlim", 1748 SYSCTL_DESCR("Default multicast hop limit"), 1749 NULL, 0, &ip6_defmcasthlim, 0, 1750 CTL_NET, PF_INET6, IPPROTO_IPV6, 1751 IPV6CTL_DEFMCASTHLIM, CTL_EOL); 1752 sysctl_createv(clog, 0, NULL, NULL, 1753 CTLFLAG_PERMANENT, 1754 CTLTYPE_STRING, "kame_version", 1755 SYSCTL_DESCR("KAME Version"), 1756 NULL, 0, __UNCONST(__KAME_VERSION), 0, 1757 CTL_NET, PF_INET6, IPPROTO_IPV6, 1758 IPV6CTL_KAME_VERSION, CTL_EOL); 1759 sysctl_createv(clog, 0, NULL, NULL, 1760 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1761 CTLTYPE_INT, "use_deprecated", 1762 SYSCTL_DESCR("Allow use of deprecated addresses as " 1763 "source addresses"), 1764 NULL, 0, &ip6_use_deprecated, 0, 1765 CTL_NET, PF_INET6, IPPROTO_IPV6, 1766 IPV6CTL_USE_DEPRECATED, CTL_EOL); 1767 sysctl_createv(clog, 0, NULL, NULL, 1768 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1769 CTLTYPE_INT, "rr_prune", NULL, 1770 NULL, 0, &ip6_rr_prune, 0, 1771 CTL_NET, PF_INET6, IPPROTO_IPV6, 1772 IPV6CTL_RR_PRUNE, CTL_EOL); 1773 sysctl_createv(clog, 0, NULL, NULL, 1774 CTLFLAG_PERMANENT 1775 #ifndef INET6_BINDV6ONLY 1776 |CTLFLAG_READWRITE, 1777 #endif 1778 CTLTYPE_INT, "v6only", 1779 SYSCTL_DESCR("Disallow PF_INET6 sockets from connecting " 1780 "to PF_INET sockets"), 1781 NULL, 0, &ip6_v6only, 0, 1782 CTL_NET, PF_INET6, IPPROTO_IPV6, 1783 IPV6CTL_V6ONLY, CTL_EOL); 1784 sysctl_createv(clog, 0, NULL, NULL, 1785 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1786 CTLTYPE_INT, "anonportmin", 1787 SYSCTL_DESCR("Lowest ephemeral port number to assign"), 1788 sysctl_net_inet_ip_ports, 0, &ip6_anonportmin, 0, 1789 CTL_NET, PF_INET6, IPPROTO_IPV6, 1790 IPV6CTL_ANONPORTMIN, CTL_EOL); 1791 sysctl_createv(clog, 0, NULL, NULL, 1792 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1793 CTLTYPE_INT, "anonportmax", 1794 SYSCTL_DESCR("Highest ephemeral port number to assign"), 1795 sysctl_net_inet_ip_ports, 0, &ip6_anonportmax, 0, 1796 CTL_NET, PF_INET6, IPPROTO_IPV6, 1797 IPV6CTL_ANONPORTMAX, CTL_EOL); 1798 #ifndef IPNOPRIVPORTS 1799 sysctl_createv(clog, 0, NULL, NULL, 1800 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1801 CTLTYPE_INT, "lowportmin", 1802 SYSCTL_DESCR("Lowest privileged ephemeral port number " 1803 "to assign"), 1804 sysctl_net_inet_ip_ports, 0, &ip6_lowportmin, 0, 1805 CTL_NET, PF_INET6, IPPROTO_IPV6, 1806 IPV6CTL_LOWPORTMIN, CTL_EOL); 1807 sysctl_createv(clog, 0, NULL, NULL, 1808 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1809 CTLTYPE_INT, "lowportmax", 1810 SYSCTL_DESCR("Highest privileged ephemeral port number " 1811 "to assign"), 1812 sysctl_net_inet_ip_ports, 0, &ip6_lowportmax, 0, 1813 CTL_NET, PF_INET6, IPPROTO_IPV6, 1814 IPV6CTL_LOWPORTMAX, CTL_EOL); 1815 #endif /* IPNOPRIVPORTS */ 1816 sysctl_createv(clog, 0, NULL, NULL, 1817 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1818 CTLTYPE_INT, "auto_linklocal", 1819 SYSCTL_DESCR("Default value of per-interface flag for " 1820 "adding an IPv6 link-local address to " 1821 "interfaces when attached"), 1822 NULL, 0, &ip6_auto_linklocal, 0, 1823 CTL_NET, PF_INET6, IPPROTO_IPV6, 1824 IPV6CTL_AUTO_LINKLOCAL, CTL_EOL); 1825 sysctl_createv(clog, 0, NULL, NULL, 1826 CTLFLAG_PERMANENT|CTLFLAG_READONLY, 1827 CTLTYPE_STRUCT, "addctlpolicy", 1828 SYSCTL_DESCR("Return the current address control" 1829 " policy"), 1830 sysctl_net_inet6_addrctlpolicy, 0, NULL, 0, 1831 CTL_NET, PF_INET6, IPPROTO_IPV6, 1832 IPV6CTL_ADDRCTLPOLICY, CTL_EOL); 1833 sysctl_createv(clog, 0, NULL, NULL, 1834 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1835 CTLTYPE_INT, "use_tempaddr", 1836 SYSCTL_DESCR("Use temporary address"), 1837 NULL, 0, &ip6_use_tempaddr, 0, 1838 CTL_NET, PF_INET6, IPPROTO_IPV6, 1839 CTL_CREATE, CTL_EOL); 1840 sysctl_createv(clog, 0, NULL, NULL, 1841 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1842 CTLTYPE_INT, "prefer_tempaddr", 1843 SYSCTL_DESCR("Prefer temporary address as source " 1844 "address"), 1845 NULL, 0, &ip6_prefer_tempaddr, 0, 1846 CTL_NET, PF_INET6, IPPROTO_IPV6, 1847 CTL_CREATE, CTL_EOL); 1848 sysctl_createv(clog, 0, NULL, NULL, 1849 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1850 CTLTYPE_INT, "temppltime", 1851 SYSCTL_DESCR("preferred lifetime of a temporary address"), 1852 NULL, 0, &ip6_temp_preferred_lifetime, 0, 1853 CTL_NET, PF_INET6, IPPROTO_IPV6, 1854 CTL_CREATE, CTL_EOL); 1855 sysctl_createv(clog, 0, NULL, NULL, 1856 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1857 CTLTYPE_INT, "tempvltime", 1858 SYSCTL_DESCR("valid lifetime of a temporary address"), 1859 NULL, 0, &ip6_temp_valid_lifetime, 0, 1860 CTL_NET, PF_INET6, IPPROTO_IPV6, 1861 CTL_CREATE, CTL_EOL); 1862 sysctl_createv(clog, 0, NULL, NULL, 1863 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1864 CTLTYPE_INT, "maxfrags", 1865 SYSCTL_DESCR("Maximum fragments in reassembly queue"), 1866 NULL, 0, &ip6_maxfrags, 0, 1867 CTL_NET, PF_INET6, IPPROTO_IPV6, 1868 IPV6CTL_MAXFRAGS, CTL_EOL); 1869 sysctl_createv(clog, 0, NULL, NULL, 1870 CTLFLAG_PERMANENT, 1871 CTLTYPE_STRUCT, "stats", 1872 SYSCTL_DESCR("IPv6 statistics"), 1873 sysctl_net_inet6_ip6_stats, 0, NULL, 0, 1874 CTL_NET, PF_INET6, IPPROTO_IPV6, 1875 IPV6CTL_STATS, CTL_EOL); 1876 sysctl_createv(clog, 0, NULL, NULL, 1877 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1878 CTLTYPE_INT, "use_defaultzone", 1879 SYSCTL_DESCR("Whether to use the default scope zones"), 1880 NULL, 0, &ip6_use_defzone, 0, 1881 CTL_NET, PF_INET6, IPPROTO_IPV6, 1882 IPV6CTL_USE_DEFAULTZONE, CTL_EOL); 1883 sysctl_createv(clog, 0, NULL, NULL, 1884 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1885 CTLTYPE_INT, "mcast_pmtu", 1886 SYSCTL_DESCR("Enable pMTU discovery for multicast packet"), 1887 NULL, 0, &ip6_mcast_pmtu, 0, 1888 CTL_NET, PF_INET6, IPPROTO_IPV6, 1889 CTL_CREATE, CTL_EOL); 1890 /* anonportalgo RFC6056 subtree */ 1891 const struct sysctlnode *portalgo_node; 1892 sysctl_createv(clog, 0, NULL, &portalgo_node, 1893 CTLFLAG_PERMANENT, 1894 CTLTYPE_NODE, "anonportalgo", 1895 SYSCTL_DESCR("Anonymous port algorithm selection (RFC 6056)"), 1896 NULL, 0, NULL, 0, 1897 CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_CREATE, CTL_EOL); 1898 sysctl_createv(clog, 0, &portalgo_node, NULL, 1899 CTLFLAG_PERMANENT, 1900 CTLTYPE_STRING, "available", 1901 SYSCTL_DESCR("available algorithms"), 1902 sysctl_portalgo_available, 0, NULL, PORTALGO_MAXLEN, 1903 CTL_CREATE, CTL_EOL); 1904 sysctl_createv(clog, 0, &portalgo_node, NULL, 1905 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1906 CTLTYPE_STRING, "selected", 1907 SYSCTL_DESCR("selected algorithm"), 1908 sysctl_portalgo_selected6, 0, NULL, PORTALGO_MAXLEN, 1909 CTL_CREATE, CTL_EOL); 1910 sysctl_createv(clog, 0, &portalgo_node, NULL, 1911 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1912 CTLTYPE_STRUCT, "reserve", 1913 SYSCTL_DESCR("bitmap of reserved ports"), 1914 sysctl_portalgo_reserve6, 0, NULL, 0, 1915 CTL_CREATE, CTL_EOL); 1916 sysctl_createv(clog, 0, NULL, NULL, 1917 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1918 CTLTYPE_INT, "neighborgcthresh", 1919 SYSCTL_DESCR("Maximum number of entries in neighbor" 1920 " cache"), 1921 NULL, 1, &ip6_neighborgcthresh, 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, "maxifprefixes", 1927 SYSCTL_DESCR("Maximum number of prefixes created by" 1928 " route advertisement per interface"), 1929 NULL, 1, &ip6_maxifprefixes, 0, 1930 CTL_NET, PF_INET6, IPPROTO_IPV6, 1931 CTL_CREATE, CTL_EOL); 1932 sysctl_createv(clog, 0, NULL, NULL, 1933 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1934 CTLTYPE_INT, "maxifdefrouters", 1935 SYSCTL_DESCR("Maximum number of default routers created" 1936 " by route advertisement per interface"), 1937 NULL, 1, &ip6_maxifdefrouters, 0, 1938 CTL_NET, PF_INET6, IPPROTO_IPV6, 1939 CTL_CREATE, CTL_EOL); 1940 sysctl_createv(clog, 0, NULL, NULL, 1941 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1942 CTLTYPE_INT, "maxdynroutes", 1943 SYSCTL_DESCR("Maximum number of routes created via" 1944 " redirect"), 1945 NULL, 1, &ip6_maxdynroutes, 0, 1946 CTL_NET, PF_INET6, IPPROTO_IPV6, 1947 CTL_CREATE, CTL_EOL); 1948 } 1949 1950 void 1951 ip6_statinc(u_int stat) 1952 { 1953 1954 KASSERT(stat < IP6_NSTATS); 1955 IP6_STATINC(stat); 1956 } 1957