1 /* $NetBSD: ip6_input.c,v 1.169 2016/10/18 07:30:31 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 1.169 2016/10/18 07:30:31 ozaki-r 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_compat_netbsd.h" 73 #include "opt_net_mpsafe.h" 74 #endif 75 76 #include <sys/param.h> 77 #include <sys/systm.h> 78 #include <sys/malloc.h> 79 #include <sys/mbuf.h> 80 #include <sys/domain.h> 81 #include <sys/protosw.h> 82 #include <sys/socket.h> 83 #include <sys/socketvar.h> 84 #include <sys/errno.h> 85 #include <sys/time.h> 86 #include <sys/kernel.h> 87 #include <sys/syslog.h> 88 #include <sys/proc.h> 89 #include <sys/sysctl.h> 90 #include <sys/cprng.h> 91 #include <sys/percpu.h> 92 93 #include <net/if.h> 94 #include <net/if_types.h> 95 #include <net/if_dl.h> 96 #include <net/route.h> 97 #include <net/pktqueue.h> 98 #include <net/pfil.h> 99 100 #include <netinet/in.h> 101 #include <netinet/in_systm.h> 102 #ifdef INET 103 #include <netinet/ip.h> 104 #include <netinet/ip_var.h> 105 #include <netinet/ip_icmp.h> 106 #endif /* INET */ 107 #include <netinet/ip6.h> 108 #include <netinet/portalgo.h> 109 #include <netinet6/in6_var.h> 110 #include <netinet6/ip6_var.h> 111 #include <netinet6/ip6_private.h> 112 #include <netinet6/in6_pcb.h> 113 #include <netinet/icmp6.h> 114 #include <netinet6/scope6_var.h> 115 #include <netinet6/in6_ifattach.h> 116 #include <netinet6/nd6.h> 117 118 #ifdef IPSEC 119 #include <netipsec/ipsec.h> 120 #include <netipsec/ipsec6.h> 121 #include <netipsec/key.h> 122 #endif /* IPSEC */ 123 124 #ifdef COMPAT_50 125 #include <compat/sys/time.h> 126 #include <compat/sys/socket.h> 127 #endif 128 129 #include <netinet6/ip6protosw.h> 130 131 #include "faith.h" 132 133 #include <net/net_osdep.h> 134 135 extern struct domain inet6domain; 136 137 u_char ip6_protox[IPPROTO_MAX]; 138 pktqueue_t *ip6_pktq __read_mostly; 139 140 int ip6_forward_srcrt; /* XXX */ 141 int ip6_sourcecheck; /* XXX */ 142 int ip6_sourcecheck_interval; /* XXX */ 143 144 pfil_head_t *inet6_pfil_hook; 145 146 percpu_t *ip6stat_percpu; 147 148 percpu_t *ip6_forward_rt_percpu __cacheline_aligned; 149 150 static void ip6_init2(void); 151 static void ip6intr(void *); 152 static struct m_tag *ip6_setdstifaddr(struct mbuf *, const struct in6_ifaddr *); 153 154 static int ip6_process_hopopts(struct mbuf *, u_int8_t *, int, u_int32_t *, 155 u_int32_t *); 156 static struct mbuf *ip6_pullexthdr(struct mbuf *, size_t, int); 157 static void sysctl_net_inet6_ip6_setup(struct sysctllog **); 158 159 #ifdef NET_MPSAFE 160 #define SOFTNET_LOCK() mutex_enter(softnet_lock) 161 #define SOFTNET_UNLOCK() mutex_exit(softnet_lock) 162 #else 163 #define SOFTNET_LOCK() KASSERT(mutex_owned(softnet_lock)) 164 #define SOFTNET_UNLOCK() KASSERT(mutex_owned(softnet_lock)) 165 #endif 166 167 /* 168 * IP6 initialization: fill in IP6 protocol switch table. 169 * All protocols not implemented in kernel go to raw IP6 protocol handler. 170 */ 171 void 172 ip6_init(void) 173 { 174 const struct ip6protosw *pr; 175 int i; 176 177 in6_init(); 178 179 sysctl_net_inet6_ip6_setup(NULL); 180 pr = (const struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 181 if (pr == 0) 182 panic("ip6_init"); 183 for (i = 0; i < IPPROTO_MAX; i++) 184 ip6_protox[i] = pr - inet6sw; 185 for (pr = (const struct ip6protosw *)inet6domain.dom_protosw; 186 pr < (const struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++) 187 if (pr->pr_domain->dom_family == PF_INET6 && 188 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) 189 ip6_protox[pr->pr_protocol] = pr - inet6sw; 190 191 ip6_pktq = pktq_create(IFQ_MAXLEN, ip6intr, NULL); 192 KASSERT(ip6_pktq != NULL); 193 194 scope6_init(); 195 addrsel_policy_init(); 196 nd6_init(); 197 frag6_init(); 198 ip6_desync_factor = cprng_fast32() % MAX_TEMP_DESYNC_FACTOR; 199 200 ip6_init2(); 201 #ifdef GATEWAY 202 ip6flow_init(ip6_hashsize); 203 #endif 204 /* Register our Packet Filter hook. */ 205 inet6_pfil_hook = pfil_head_create(PFIL_TYPE_AF, (void *)AF_INET6); 206 KASSERT(inet6_pfil_hook != NULL); 207 208 ip6stat_percpu = percpu_alloc(sizeof(uint64_t) * IP6_NSTATS); 209 210 ip6_forward_rt_percpu = percpu_alloc(sizeof(struct route)); 211 if (ip6_forward_rt_percpu == NULL) 212 panic("failed to alllocate ip6_forward_rt_percpu"); 213 } 214 215 static void 216 ip6_init2(void) 217 { 218 219 /* timer for regeneranation of temporary addresses randomize ID */ 220 callout_init(&in6_tmpaddrtimer_ch, CALLOUT_MPSAFE); 221 callout_reset(&in6_tmpaddrtimer_ch, 222 (ip6_temp_preferred_lifetime - ip6_desync_factor - 223 ip6_temp_regen_advance) * hz, 224 in6_tmpaddrtimer, NULL); 225 } 226 227 /* 228 * IP6 input interrupt handling. Just pass the packet to ip6_input. 229 */ 230 static void 231 ip6intr(void *arg __unused) 232 { 233 struct mbuf *m; 234 235 #ifndef NET_MPSAFE 236 mutex_enter(softnet_lock); 237 #endif 238 while ((m = pktq_dequeue(ip6_pktq)) != NULL) { 239 struct psref psref; 240 struct ifnet *rcvif = m_get_rcvif_psref(m, &psref); 241 242 if (rcvif == NULL) { 243 m_freem(m); 244 continue; 245 } 246 /* 247 * Drop the packet if IPv6 is disabled on the interface. 248 */ 249 if ((ND_IFINFO(rcvif)->flags & ND6_IFF_IFDISABLED)) { 250 m_put_rcvif_psref(rcvif, &psref); 251 m_freem(m); 252 continue; 253 } 254 ip6_input(m, rcvif); 255 m_put_rcvif_psref(rcvif, &psref); 256 } 257 #ifndef NET_MPSAFE 258 mutex_exit(softnet_lock); 259 #endif 260 } 261 262 void 263 ip6_input(struct mbuf *m, struct ifnet *rcvif) 264 { 265 struct ip6_hdr *ip6; 266 int hit, off = sizeof(struct ip6_hdr), nest; 267 u_int32_t plen; 268 u_int32_t rtalert = ~0; 269 int nxt, ours = 0, rh_present = 0; 270 struct ifnet *deliverifp = NULL; 271 int srcrt = 0; 272 const struct rtentry *rt; 273 union { 274 struct sockaddr dst; 275 struct sockaddr_in6 dst6; 276 } u; 277 struct route *ro; 278 279 /* 280 * make sure we don't have onion peering information into m_tag. 281 */ 282 ip6_delaux(m); 283 284 /* 285 * mbuf statistics 286 */ 287 if (m->m_flags & M_EXT) { 288 if (m->m_next) 289 IP6_STATINC(IP6_STAT_MEXT2M); 290 else 291 IP6_STATINC(IP6_STAT_MEXT1); 292 } else { 293 #define M2MMAX 32 294 if (m->m_next) { 295 if (m->m_flags & M_LOOP) 296 /*XXX*/ IP6_STATINC(IP6_STAT_M2M + lo0ifp->if_index); 297 else if (rcvif->if_index < M2MMAX) 298 IP6_STATINC(IP6_STAT_M2M + rcvif->if_index); 299 else 300 IP6_STATINC(IP6_STAT_M2M); 301 } else 302 IP6_STATINC(IP6_STAT_M1); 303 #undef M2MMAX 304 } 305 306 in6_ifstat_inc(rcvif, ifs6_in_receive); 307 IP6_STATINC(IP6_STAT_TOTAL); 308 309 /* 310 * If the IPv6 header is not aligned, slurp it up into a new 311 * mbuf with space for link headers, in the event we forward 312 * it. Otherwise, if it is aligned, make sure the entire base 313 * IPv6 header is in the first mbuf of the chain. 314 */ 315 if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 316 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 317 (max_linkhdr + 3) & ~3)) == NULL) { 318 /* XXXJRT new stat, please */ 319 IP6_STATINC(IP6_STAT_TOOSMALL); 320 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 321 return; 322 } 323 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 324 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 325 IP6_STATINC(IP6_STAT_TOOSMALL); 326 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 327 return; 328 } 329 } 330 331 ip6 = mtod(m, struct ip6_hdr *); 332 333 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 334 IP6_STATINC(IP6_STAT_BADVERS); 335 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 336 goto bad; 337 } 338 339 /* 340 * Assume that we can create a fast-forward IP flow entry 341 * based on this packet. 342 */ 343 m->m_flags |= M_CANFASTFWD; 344 345 /* 346 * Run through list of hooks for input packets. If there are any 347 * filters which require that additional packets in the flow are 348 * not fast-forwarded, they must clear the M_CANFASTFWD flag. 349 * Note that filters must _never_ set this flag, as another filter 350 * in the list may have previously cleared it. 351 */ 352 /* 353 * let ipfilter look at packet on the wire, 354 * not the decapsulated packet. 355 */ 356 #if defined(IPSEC) 357 if (!ipsec_used || !ipsec_indone(m)) 358 #else 359 if (1) 360 #endif 361 { 362 struct in6_addr odst; 363 364 odst = ip6->ip6_dst; 365 if (pfil_run_hooks(inet6_pfil_hook, &m, rcvif, PFIL_IN) != 0) 366 return; 367 if (m == NULL) 368 return; 369 ip6 = mtod(m, struct ip6_hdr *); 370 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst); 371 } 372 373 IP6_STATINC(IP6_STAT_NXTHIST + ip6->ip6_nxt); 374 375 #ifdef ALTQ 376 if (altq_input != NULL) { 377 SOFTNET_LOCK(); 378 if ((*altq_input)(m, AF_INET6) == 0) { 379 SOFTNET_UNLOCK(); 380 /* packet is dropped by traffic conditioner */ 381 return; 382 } 383 SOFTNET_UNLOCK(); 384 } 385 #endif 386 387 /* 388 * Check against address spoofing/corruption. 389 */ 390 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) || 391 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) { 392 /* 393 * XXX: "badscope" is not very suitable for a multicast source. 394 */ 395 IP6_STATINC(IP6_STAT_BADSCOPE); 396 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 397 goto bad; 398 } 399 /* 400 * The following check is not documented in specs. A malicious 401 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack 402 * and bypass security checks (act as if it was from 127.0.0.1 by using 403 * IPv6 src ::ffff:127.0.0.1). Be cautious. 404 * 405 * This check chokes if we are in an SIIT cloud. As none of BSDs 406 * support IPv4-less kernel compilation, we cannot support SIIT 407 * environment at all. So, it makes more sense for us to reject any 408 * malicious packets for non-SIIT environment, than try to do a 409 * partial support for SIIT environment. 410 */ 411 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 412 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 413 IP6_STATINC(IP6_STAT_BADSCOPE); 414 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 415 goto bad; 416 } 417 #if 0 418 /* 419 * Reject packets with IPv4 compatible addresses (auto tunnel). 420 * 421 * The code forbids auto tunnel relay case in RFC1933 (the check is 422 * stronger than RFC1933). We may want to re-enable it if mech-xx 423 * is revised to forbid relaying case. 424 */ 425 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) || 426 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) { 427 IP6_STATINC(IP6_STAT_BADSCOPE); 428 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 429 goto bad; 430 } 431 #endif 432 433 /* 434 * Disambiguate address scope zones (if there is ambiguity). 435 * We first make sure that the original source or destination address 436 * is not in our internal form for scoped addresses. Such addresses 437 * are not necessarily invalid spec-wise, but we cannot accept them due 438 * to the usage conflict. 439 * in6_setscope() then also checks and rejects the cases where src or 440 * dst are the loopback address and the receiving interface 441 * is not loopback. 442 */ 443 if (__predict_false( 444 m_makewritable(&m, 0, sizeof(struct ip6_hdr), M_DONTWAIT))) 445 goto bad; 446 ip6 = mtod(m, struct ip6_hdr *); 447 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) { 448 IP6_STATINC(IP6_STAT_BADSCOPE); /* XXX */ 449 goto bad; 450 } 451 if (in6_setscope(&ip6->ip6_src, rcvif, NULL) || 452 in6_setscope(&ip6->ip6_dst, rcvif, NULL)) { 453 IP6_STATINC(IP6_STAT_BADSCOPE); 454 goto bad; 455 } 456 457 /* 458 * Multicast check 459 */ 460 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 461 struct in6_multi *in6m = 0; 462 463 in6_ifstat_inc(rcvif, ifs6_in_mcast); 464 /* 465 * See if we belong to the destination multicast group on the 466 * arrival interface. 467 */ 468 IN6_LOOKUP_MULTI(ip6->ip6_dst, rcvif, in6m); 469 if (in6m) 470 ours = 1; 471 else if (!ip6_mrouter) { 472 uint64_t *ip6s = IP6_STAT_GETREF(); 473 ip6s[IP6_STAT_NOTMEMBER]++; 474 ip6s[IP6_STAT_CANTFORWARD]++; 475 IP6_STAT_PUTREF(); 476 in6_ifstat_inc(rcvif, ifs6_in_discard); 477 goto bad; 478 } 479 deliverifp = rcvif; 480 goto hbhcheck; 481 } 482 483 sockaddr_in6_init(&u.dst6, &ip6->ip6_dst, 0, 0, 0); 484 485 /* 486 * Unicast check 487 */ 488 ro = percpu_getref(ip6_forward_rt_percpu); 489 rt = rtcache_lookup2(ro, &u.dst, 1, &hit); 490 percpu_putref(ip6_forward_rt_percpu); 491 if (hit) 492 IP6_STATINC(IP6_STAT_FORWARD_CACHEHIT); 493 else 494 IP6_STATINC(IP6_STAT_FORWARD_CACHEMISS); 495 496 #define rt6_getkey(__rt) satocsin6(rt_getkey(__rt)) 497 498 /* 499 * Accept the packet if the forwarding interface to the destination 500 * according to the routing table is the loopback interface, 501 * unless the associated route has a gateway. 502 * Note that this approach causes to accept a packet if there is a 503 * route to the loopback interface for the destination of the packet. 504 * But we think it's even useful in some situations, e.g. when using 505 * a special daemon which wants to intercept the packet. 506 */ 507 if (rt != NULL && 508 (rt->rt_flags & (RTF_HOST|RTF_GATEWAY)) == RTF_HOST && 509 #if 0 510 /* 511 * The check below is redundant since the comparison of 512 * the destination and the key of the rtentry has 513 * already done through looking up the routing table. 514 */ 515 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &rt6_getkey(rt)->sin6_addr) && 516 #endif 517 rt->rt_ifp->if_type == IFT_LOOP) { 518 struct in6_ifaddr *ia6 = (struct in6_ifaddr *)rt->rt_ifa; 519 if (ia6->ia6_flags & IN6_IFF_ANYCAST) 520 m->m_flags |= M_ANYCAST6; 521 /* 522 * packets to a tentative, duplicated, or somehow invalid 523 * address must not be accepted. 524 */ 525 if (!(ia6->ia6_flags & (IN6_IFF_NOTREADY | IN6_IFF_DETACHED))) { 526 /* this address is ready */ 527 ours = 1; 528 deliverifp = ia6->ia_ifp; /* correct? */ 529 goto hbhcheck; 530 } else { 531 /* address is not ready, so discard the packet. */ 532 nd6log(LOG_INFO, "packet to an unready address %s->%s\n", 533 ip6_sprintf(&ip6->ip6_src), 534 ip6_sprintf(&ip6->ip6_dst)); 535 536 goto bad; 537 } 538 } 539 540 /* 541 * FAITH (Firewall Aided Internet Translator) 542 */ 543 #if defined(NFAITH) && 0 < NFAITH 544 if (ip6_keepfaith) { 545 if (rt != NULL && rt->rt_ifp != NULL && 546 rt->rt_ifp->if_type == IFT_FAITH) { 547 /* XXX do we need more sanity checks? */ 548 ours = 1; 549 deliverifp = rt->rt_ifp; /* faith */ 550 goto hbhcheck; 551 } 552 } 553 #endif 554 555 #if 0 556 { 557 /* 558 * Last resort: check in6_ifaddr for incoming interface. 559 * The code is here until I update the "goto ours hack" code above 560 * working right. 561 */ 562 struct ifaddr *ifa; 563 IFADDR_READER_FOREACH(ifa, rcvif) { 564 if (ifa->ifa_addr->sa_family != AF_INET6) 565 continue; 566 if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) { 567 ours = 1; 568 deliverifp = ifa->ifa_ifp; 569 goto hbhcheck; 570 } 571 } 572 } 573 #endif 574 575 /* 576 * Now there is no reason to process the packet if it's not our own 577 * and we're not a router. 578 */ 579 if (!ip6_forwarding) { 580 IP6_STATINC(IP6_STAT_CANTFORWARD); 581 in6_ifstat_inc(rcvif, ifs6_in_discard); 582 goto bad; 583 } 584 585 hbhcheck: 586 /* 587 * record address information into m_tag, if we don't have one yet. 588 * note that we are unable to record it, if the address is not listed 589 * as our interface address (e.g. multicast addresses, addresses 590 * within FAITH prefixes and such). 591 */ 592 if (deliverifp && ip6_getdstifaddr(m) == NULL) { 593 struct in6_ifaddr *ia6; 594 int s = pserialize_read_enter(); 595 596 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 597 /* Depends on ip6_setdstifaddr never sleep */ 598 if (ia6 != NULL && ip6_setdstifaddr(m, ia6) == NULL) { 599 /* 600 * XXX maybe we should drop the packet here, 601 * as we could not provide enough information 602 * to the upper layers. 603 */ 604 } 605 pserialize_read_exit(s); 606 } 607 608 /* 609 * Process Hop-by-Hop options header if it's contained. 610 * m may be modified in ip6_hopopts_input(). 611 * If a JumboPayload option is included, plen will also be modified. 612 */ 613 plen = (u_int32_t)ntohs(ip6->ip6_plen); 614 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 615 struct ip6_hbh *hbh; 616 617 if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) { 618 #if 0 /*touches NULL pointer*/ 619 in6_ifstat_inc(rcvif, ifs6_in_discard); 620 #endif 621 return; /* m have already been freed */ 622 } 623 624 /* adjust pointer */ 625 ip6 = mtod(m, struct ip6_hdr *); 626 627 /* 628 * if the payload length field is 0 and the next header field 629 * indicates Hop-by-Hop Options header, then a Jumbo Payload 630 * option MUST be included. 631 */ 632 if (ip6->ip6_plen == 0 && plen == 0) { 633 /* 634 * Note that if a valid jumbo payload option is 635 * contained, ip6_hopopts_input() must set a valid 636 * (non-zero) payload length to the variable plen. 637 */ 638 IP6_STATINC(IP6_STAT_BADOPTIONS); 639 in6_ifstat_inc(rcvif, ifs6_in_discard); 640 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 641 icmp6_error(m, ICMP6_PARAM_PROB, 642 ICMP6_PARAMPROB_HEADER, 643 (char *)&ip6->ip6_plen - (char *)ip6); 644 return; 645 } 646 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 647 sizeof(struct ip6_hbh)); 648 if (hbh == NULL) { 649 IP6_STATINC(IP6_STAT_TOOSHORT); 650 return; 651 } 652 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 653 nxt = hbh->ip6h_nxt; 654 655 /* 656 * accept the packet if a router alert option is included 657 * and we act as an IPv6 router. 658 */ 659 if (rtalert != ~0 && ip6_forwarding) 660 ours = 1; 661 } else 662 nxt = ip6->ip6_nxt; 663 664 /* 665 * Check that the amount of data in the buffers 666 * is as at least much as the IPv6 header would have us expect. 667 * Trim mbufs if longer than we expect. 668 * Drop packet if shorter than we expect. 669 */ 670 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 671 IP6_STATINC(IP6_STAT_TOOSHORT); 672 in6_ifstat_inc(rcvif, ifs6_in_truncated); 673 goto bad; 674 } 675 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 676 if (m->m_len == m->m_pkthdr.len) { 677 m->m_len = sizeof(struct ip6_hdr) + plen; 678 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 679 } else 680 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 681 } 682 683 /* 684 * Forward if desirable. 685 */ 686 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 687 /* 688 * If we are acting as a multicast router, all 689 * incoming multicast packets are passed to the 690 * kernel-level multicast forwarding function. 691 * The packet is returned (relatively) intact; if 692 * ip6_mforward() returns a non-zero value, the packet 693 * must be discarded, else it may be accepted below. 694 */ 695 if (ip6_mrouter != NULL) { 696 int error; 697 698 SOFTNET_LOCK(); 699 error = ip6_mforward(ip6, rcvif, m); 700 SOFTNET_UNLOCK(); 701 702 if (error != 0) { 703 IP6_STATINC(IP6_STAT_CANTFORWARD); 704 m_freem(m); 705 return; 706 } 707 } 708 if (!ours) { 709 m_freem(m); 710 return; 711 } 712 } else if (!ours) { 713 ip6_forward(m, srcrt); 714 return; 715 } 716 717 ip6 = mtod(m, struct ip6_hdr *); 718 719 /* 720 * Malicious party may be able to use IPv4 mapped addr to confuse 721 * tcp/udp stack and bypass security checks (act as if it was from 722 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious. 723 * 724 * For SIIT end node behavior, you may want to disable the check. 725 * However, you will become vulnerable to attacks using IPv4 mapped 726 * source. 727 */ 728 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 729 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 730 IP6_STATINC(IP6_STAT_BADSCOPE); 731 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 732 goto bad; 733 } 734 735 /* 736 * Tell launch routine the next header 737 */ 738 #ifdef IFA_STATS 739 if (deliverifp != NULL) { 740 struct in6_ifaddr *ia6; 741 int s = pserialize_read_enter(); 742 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 743 if (ia6) 744 ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len; 745 pserialize_read_exit(s); 746 } 747 #endif 748 IP6_STATINC(IP6_STAT_DELIVERED); 749 in6_ifstat_inc(deliverifp, ifs6_in_deliver); 750 nest = 0; 751 752 rh_present = 0; 753 while (nxt != IPPROTO_DONE) { 754 if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) { 755 IP6_STATINC(IP6_STAT_TOOMANYHDR); 756 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 757 goto bad; 758 } 759 760 /* 761 * protection against faulty packet - there should be 762 * more sanity checks in header chain processing. 763 */ 764 if (m->m_pkthdr.len < off) { 765 IP6_STATINC(IP6_STAT_TOOSHORT); 766 in6_ifstat_inc(rcvif, ifs6_in_truncated); 767 goto bad; 768 } 769 770 if (nxt == IPPROTO_ROUTING) { 771 if (rh_present++) { 772 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 773 IP6_STATINC(IP6_STAT_BADOPTIONS); 774 goto bad; 775 } 776 } 777 778 #ifdef IPSEC 779 if (ipsec_used) { 780 /* 781 * enforce IPsec policy checking if we are seeing last 782 * header. note that we do not visit this with 783 * protocols with pcb layer code - like udp/tcp/raw ip. 784 */ 785 if ((inet6sw[ip_protox[nxt]].pr_flags 786 & PR_LASTHDR) != 0) { 787 int error; 788 789 SOFTNET_LOCK(); 790 error = ipsec6_input(m); 791 SOFTNET_UNLOCK(); 792 if (error) 793 goto bad; 794 } 795 } 796 #endif /* IPSEC */ 797 798 SOFTNET_LOCK(); 799 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt); 800 SOFTNET_UNLOCK(); 801 } 802 return; 803 bad: 804 m_freem(m); 805 } 806 807 /* 808 * set/grab in6_ifaddr correspond to IPv6 destination address. 809 */ 810 static struct m_tag * 811 ip6_setdstifaddr(struct mbuf *m, const struct in6_ifaddr *ia) 812 { 813 struct m_tag *mtag; 814 struct ip6aux *ip6a; 815 816 mtag = ip6_addaux(m); 817 if (mtag == NULL) 818 return NULL; 819 820 ip6a = (struct ip6aux *)(mtag + 1); 821 if (in6_setscope(&ip6a->ip6a_src, ia->ia_ifp, &ip6a->ip6a_scope_id)) { 822 IP6_STATINC(IP6_STAT_BADSCOPE); 823 return NULL; 824 } 825 826 ip6a->ip6a_src = ia->ia_addr.sin6_addr; 827 ip6a->ip6a_flags = ia->ia6_flags; 828 return mtag; 829 } 830 831 const struct ip6aux * 832 ip6_getdstifaddr(struct mbuf *m) 833 { 834 struct m_tag *mtag; 835 836 mtag = ip6_findaux(m); 837 if (mtag != NULL) 838 return (struct ip6aux *)(mtag + 1); 839 else 840 return NULL; 841 } 842 843 /* 844 * Hop-by-Hop options header processing. If a valid jumbo payload option is 845 * included, the real payload length will be stored in plenp. 846 * 847 * rtalertp - XXX: should be stored more smart way 848 */ 849 int 850 ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp, 851 struct mbuf **mp, int *offp) 852 { 853 struct mbuf *m = *mp; 854 int off = *offp, hbhlen; 855 struct ip6_hbh *hbh; 856 857 /* validation of the length of the header */ 858 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, 859 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh)); 860 if (hbh == NULL) { 861 IP6_STATINC(IP6_STAT_TOOSHORT); 862 return -1; 863 } 864 hbhlen = (hbh->ip6h_len + 1) << 3; 865 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 866 hbhlen); 867 if (hbh == NULL) { 868 IP6_STATINC(IP6_STAT_TOOSHORT); 869 return -1; 870 } 871 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 872 off += hbhlen; 873 hbhlen -= sizeof(struct ip6_hbh); 874 875 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 876 hbhlen, rtalertp, plenp) < 0) 877 return (-1); 878 879 *offp = off; 880 *mp = m; 881 return (0); 882 } 883 884 /* 885 * Search header for all Hop-by-hop options and process each option. 886 * This function is separate from ip6_hopopts_input() in order to 887 * handle a case where the sending node itself process its hop-by-hop 888 * options header. In such a case, the function is called from ip6_output(). 889 * 890 * The function assumes that hbh header is located right after the IPv6 header 891 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to 892 * opthead + hbhlen is located in continuous memory region. 893 */ 894 static int 895 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen, 896 u_int32_t *rtalertp, u_int32_t *plenp) 897 { 898 struct ip6_hdr *ip6; 899 int optlen = 0; 900 u_int8_t *opt = opthead; 901 u_int16_t rtalert_val; 902 u_int32_t jumboplen; 903 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh); 904 905 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 906 switch (*opt) { 907 case IP6OPT_PAD1: 908 optlen = 1; 909 break; 910 case IP6OPT_PADN: 911 if (hbhlen < IP6OPT_MINLEN) { 912 IP6_STATINC(IP6_STAT_TOOSMALL); 913 goto bad; 914 } 915 optlen = *(opt + 1) + 2; 916 break; 917 case IP6OPT_RTALERT: 918 /* XXX may need check for alignment */ 919 if (hbhlen < IP6OPT_RTALERT_LEN) { 920 IP6_STATINC(IP6_STAT_TOOSMALL); 921 goto bad; 922 } 923 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) { 924 /* XXX stat */ 925 icmp6_error(m, ICMP6_PARAM_PROB, 926 ICMP6_PARAMPROB_HEADER, 927 erroff + opt + 1 - opthead); 928 return (-1); 929 } 930 optlen = IP6OPT_RTALERT_LEN; 931 memcpy((void *)&rtalert_val, (void *)(opt + 2), 2); 932 *rtalertp = ntohs(rtalert_val); 933 break; 934 case IP6OPT_JUMBO: 935 /* XXX may need check for alignment */ 936 if (hbhlen < IP6OPT_JUMBO_LEN) { 937 IP6_STATINC(IP6_STAT_TOOSMALL); 938 goto bad; 939 } 940 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) { 941 /* XXX stat */ 942 icmp6_error(m, ICMP6_PARAM_PROB, 943 ICMP6_PARAMPROB_HEADER, 944 erroff + opt + 1 - opthead); 945 return (-1); 946 } 947 optlen = IP6OPT_JUMBO_LEN; 948 949 /* 950 * IPv6 packets that have non 0 payload length 951 * must not contain a jumbo payload option. 952 */ 953 ip6 = mtod(m, struct ip6_hdr *); 954 if (ip6->ip6_plen) { 955 IP6_STATINC(IP6_STAT_BADOPTIONS); 956 icmp6_error(m, ICMP6_PARAM_PROB, 957 ICMP6_PARAMPROB_HEADER, 958 erroff + opt - opthead); 959 return (-1); 960 } 961 962 /* 963 * We may see jumbolen in unaligned location, so 964 * we'd need to perform bcopy(). 965 */ 966 memcpy(&jumboplen, opt + 2, sizeof(jumboplen)); 967 jumboplen = (u_int32_t)htonl(jumboplen); 968 969 #if 1 970 /* 971 * if there are multiple jumbo payload options, 972 * *plenp will be non-zero and the packet will be 973 * rejected. 974 * the behavior may need some debate in ipngwg - 975 * multiple options does not make sense, however, 976 * there's no explicit mention in specification. 977 */ 978 if (*plenp != 0) { 979 IP6_STATINC(IP6_STAT_BADOPTIONS); 980 icmp6_error(m, ICMP6_PARAM_PROB, 981 ICMP6_PARAMPROB_HEADER, 982 erroff + opt + 2 - opthead); 983 return (-1); 984 } 985 #endif 986 987 /* 988 * jumbo payload length must be larger than 65535. 989 */ 990 if (jumboplen <= IPV6_MAXPACKET) { 991 IP6_STATINC(IP6_STAT_BADOPTIONS); 992 icmp6_error(m, ICMP6_PARAM_PROB, 993 ICMP6_PARAMPROB_HEADER, 994 erroff + opt + 2 - opthead); 995 return (-1); 996 } 997 *plenp = jumboplen; 998 999 break; 1000 default: /* unknown option */ 1001 if (hbhlen < IP6OPT_MINLEN) { 1002 IP6_STATINC(IP6_STAT_TOOSMALL); 1003 goto bad; 1004 } 1005 optlen = ip6_unknown_opt(opt, m, 1006 erroff + opt - opthead); 1007 if (optlen == -1) 1008 return (-1); 1009 optlen += 2; 1010 break; 1011 } 1012 } 1013 1014 return (0); 1015 1016 bad: 1017 m_freem(m); 1018 return (-1); 1019 } 1020 1021 /* 1022 * Unknown option processing. 1023 * The third argument `off' is the offset from the IPv6 header to the option, 1024 * which is necessary if the IPv6 header the and option header and IPv6 header 1025 * is not continuous in order to return an ICMPv6 error. 1026 */ 1027 int 1028 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off) 1029 { 1030 struct ip6_hdr *ip6; 1031 1032 switch (IP6OPT_TYPE(*optp)) { 1033 case IP6OPT_TYPE_SKIP: /* ignore the option */ 1034 return ((int)*(optp + 1)); 1035 case IP6OPT_TYPE_DISCARD: /* silently discard */ 1036 m_freem(m); 1037 return (-1); 1038 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 1039 IP6_STATINC(IP6_STAT_BADOPTIONS); 1040 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 1041 return (-1); 1042 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 1043 IP6_STATINC(IP6_STAT_BADOPTIONS); 1044 ip6 = mtod(m, struct ip6_hdr *); 1045 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 1046 (m->m_flags & (M_BCAST|M_MCAST))) 1047 m_freem(m); 1048 else 1049 icmp6_error(m, ICMP6_PARAM_PROB, 1050 ICMP6_PARAMPROB_OPTION, off); 1051 return (-1); 1052 } 1053 1054 m_freem(m); /* XXX: NOTREACHED */ 1055 return (-1); 1056 } 1057 1058 /* 1059 * Create the "control" list for this pcb. 1060 * 1061 * The routine will be called from upper layer handlers like tcp6_input(). 1062 * Thus the routine assumes that the caller (tcp6_input) have already 1063 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the 1064 * very first mbuf on the mbuf chain. 1065 * We may want to add some infinite loop prevention or sanity checks for safety. 1066 * (This applies only when you are using KAME mbuf chain restriction, i.e. 1067 * you are using IP6_EXTHDR_CHECK() not m_pulldown()) 1068 */ 1069 void 1070 ip6_savecontrol(struct in6pcb *in6p, struct mbuf **mp, 1071 struct ip6_hdr *ip6, struct mbuf *m) 1072 { 1073 #ifdef RFC2292 1074 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y)) 1075 #else 1076 #define IS2292(x, y) (y) 1077 #endif 1078 1079 if (in6p->in6p_socket->so_options & SO_TIMESTAMP 1080 #ifdef SO_OTIMESTAMP 1081 || in6p->in6p_socket->so_options & SO_OTIMESTAMP 1082 #endif 1083 ) { 1084 struct timeval tv; 1085 1086 microtime(&tv); 1087 #ifdef SO_OTIMESTAMP 1088 if (in6p->in6p_socket->so_options & SO_OTIMESTAMP) { 1089 struct timeval50 tv50; 1090 timeval_to_timeval50(&tv, &tv50); 1091 *mp = sbcreatecontrol((void *) &tv50, sizeof(tv50), 1092 SCM_OTIMESTAMP, SOL_SOCKET); 1093 } else 1094 #endif 1095 *mp = sbcreatecontrol((void *) &tv, sizeof(tv), 1096 SCM_TIMESTAMP, SOL_SOCKET); 1097 if (*mp) 1098 mp = &(*mp)->m_next; 1099 } 1100 1101 /* some OSes call this logic with IPv4 packet, for SO_TIMESTAMP */ 1102 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) 1103 return; 1104 1105 /* RFC 2292 sec. 5 */ 1106 if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) { 1107 struct in6_pktinfo pi6; 1108 1109 memcpy(&pi6.ipi6_addr, &ip6->ip6_dst, sizeof(struct in6_addr)); 1110 in6_clearscope(&pi6.ipi6_addr); /* XXX */ 1111 pi6.ipi6_ifindex = m->m_pkthdr.rcvif_index; 1112 *mp = sbcreatecontrol((void *) &pi6, 1113 sizeof(struct in6_pktinfo), 1114 IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6); 1115 if (*mp) 1116 mp = &(*mp)->m_next; 1117 } 1118 1119 if (in6p->in6p_flags & IN6P_HOPLIMIT) { 1120 int hlim = ip6->ip6_hlim & 0xff; 1121 1122 *mp = sbcreatecontrol((void *) &hlim, sizeof(int), 1123 IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6); 1124 if (*mp) 1125 mp = &(*mp)->m_next; 1126 } 1127 1128 if ((in6p->in6p_flags & IN6P_TCLASS) != 0) { 1129 u_int32_t flowinfo; 1130 int tclass; 1131 1132 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK); 1133 flowinfo >>= 20; 1134 1135 tclass = flowinfo & 0xff; 1136 *mp = sbcreatecontrol((void *)&tclass, sizeof(tclass), 1137 IPV6_TCLASS, IPPROTO_IPV6); 1138 1139 if (*mp) 1140 mp = &(*mp)->m_next; 1141 } 1142 1143 /* 1144 * IPV6_HOPOPTS socket option. Recall that we required super-user 1145 * privilege for the option (see ip6_ctloutput), but it might be too 1146 * strict, since there might be some hop-by-hop options which can be 1147 * returned to normal user. 1148 * See also RFC3542 section 8 (or RFC2292 section 6). 1149 */ 1150 if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0) { 1151 /* 1152 * Check if a hop-by-hop options header is contatined in the 1153 * received packet, and if so, store the options as ancillary 1154 * data. Note that a hop-by-hop options header must be 1155 * just after the IPv6 header, which fact is assured through 1156 * the IPv6 input processing. 1157 */ 1158 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1159 if (xip6->ip6_nxt == IPPROTO_HOPOPTS) { 1160 struct ip6_hbh *hbh; 1161 int hbhlen; 1162 struct mbuf *ext; 1163 1164 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr), 1165 xip6->ip6_nxt); 1166 if (ext == NULL) { 1167 IP6_STATINC(IP6_STAT_TOOSHORT); 1168 return; 1169 } 1170 hbh = mtod(ext, struct ip6_hbh *); 1171 hbhlen = (hbh->ip6h_len + 1) << 3; 1172 if (hbhlen != ext->m_len) { 1173 m_freem(ext); 1174 IP6_STATINC(IP6_STAT_TOOSHORT); 1175 return; 1176 } 1177 1178 /* 1179 * XXX: We copy whole the header even if a jumbo 1180 * payload option is included, which option is to 1181 * be removed before returning in the RFC 2292. 1182 * Note: this constraint is removed in RFC3542. 1183 */ 1184 *mp = sbcreatecontrol((void *)hbh, hbhlen, 1185 IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS), 1186 IPPROTO_IPV6); 1187 if (*mp) 1188 mp = &(*mp)->m_next; 1189 m_freem(ext); 1190 } 1191 } 1192 1193 /* IPV6_DSTOPTS and IPV6_RTHDR socket options */ 1194 if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) { 1195 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1196 int nxt = xip6->ip6_nxt, off = sizeof(struct ip6_hdr); 1197 1198 /* 1199 * Search for destination options headers or routing 1200 * header(s) through the header chain, and stores each 1201 * header as ancillary data. 1202 * Note that the order of the headers remains in 1203 * the chain of ancillary data. 1204 */ 1205 for (;;) { /* is explicit loop prevention necessary? */ 1206 struct ip6_ext *ip6e = NULL; 1207 int elen; 1208 struct mbuf *ext = NULL; 1209 1210 /* 1211 * if it is not an extension header, don't try to 1212 * pull it from the chain. 1213 */ 1214 switch (nxt) { 1215 case IPPROTO_DSTOPTS: 1216 case IPPROTO_ROUTING: 1217 case IPPROTO_HOPOPTS: 1218 case IPPROTO_AH: /* is it possible? */ 1219 break; 1220 default: 1221 goto loopend; 1222 } 1223 1224 ext = ip6_pullexthdr(m, off, nxt); 1225 if (ext == NULL) { 1226 IP6_STATINC(IP6_STAT_TOOSHORT); 1227 return; 1228 } 1229 ip6e = mtod(ext, struct ip6_ext *); 1230 if (nxt == IPPROTO_AH) 1231 elen = (ip6e->ip6e_len + 2) << 2; 1232 else 1233 elen = (ip6e->ip6e_len + 1) << 3; 1234 if (elen != ext->m_len) { 1235 m_freem(ext); 1236 IP6_STATINC(IP6_STAT_TOOSHORT); 1237 return; 1238 } 1239 KASSERT(IP6_HDR_ALIGNED_P(ip6e)); 1240 1241 switch (nxt) { 1242 case IPPROTO_DSTOPTS: 1243 if (!(in6p->in6p_flags & IN6P_DSTOPTS)) 1244 break; 1245 1246 *mp = sbcreatecontrol((void *)ip6e, elen, 1247 IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS), 1248 IPPROTO_IPV6); 1249 if (*mp) 1250 mp = &(*mp)->m_next; 1251 break; 1252 1253 case IPPROTO_ROUTING: 1254 if (!(in6p->in6p_flags & IN6P_RTHDR)) 1255 break; 1256 1257 *mp = sbcreatecontrol((void *)ip6e, elen, 1258 IS2292(IPV6_2292RTHDR, IPV6_RTHDR), 1259 IPPROTO_IPV6); 1260 if (*mp) 1261 mp = &(*mp)->m_next; 1262 break; 1263 1264 case IPPROTO_HOPOPTS: 1265 case IPPROTO_AH: /* is it possible? */ 1266 break; 1267 1268 default: 1269 /* 1270 * other cases have been filtered in the above. 1271 * none will visit this case. here we supply 1272 * the code just in case (nxt overwritten or 1273 * other cases). 1274 */ 1275 m_freem(ext); 1276 goto loopend; 1277 1278 } 1279 1280 /* proceed with the next header. */ 1281 off += elen; 1282 nxt = ip6e->ip6e_nxt; 1283 ip6e = NULL; 1284 m_freem(ext); 1285 ext = NULL; 1286 } 1287 loopend: 1288 ; 1289 } 1290 } 1291 #undef IS2292 1292 1293 1294 void 1295 ip6_notify_pmtu(struct in6pcb *in6p, const struct sockaddr_in6 *dst, 1296 uint32_t *mtu) 1297 { 1298 struct socket *so; 1299 struct mbuf *m_mtu; 1300 struct ip6_mtuinfo mtuctl; 1301 1302 so = in6p->in6p_socket; 1303 1304 if (mtu == NULL) 1305 return; 1306 1307 #ifdef DIAGNOSTIC 1308 if (so == NULL) /* I believe this is impossible */ 1309 panic("ip6_notify_pmtu: socket is NULL"); 1310 #endif 1311 1312 memset(&mtuctl, 0, sizeof(mtuctl)); /* zero-clear for safety */ 1313 mtuctl.ip6m_mtu = *mtu; 1314 mtuctl.ip6m_addr = *dst; 1315 if (sa6_recoverscope(&mtuctl.ip6m_addr)) 1316 return; 1317 1318 if ((m_mtu = sbcreatecontrol((void *)&mtuctl, sizeof(mtuctl), 1319 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL) 1320 return; 1321 1322 if (sbappendaddr(&so->so_rcv, (const struct sockaddr *)dst, NULL, m_mtu) 1323 == 0) { 1324 m_freem(m_mtu); 1325 /* XXX: should count statistics */ 1326 } else 1327 sorwakeup(so); 1328 1329 return; 1330 } 1331 1332 /* 1333 * pull single extension header from mbuf chain. returns single mbuf that 1334 * contains the result, or NULL on error. 1335 */ 1336 static struct mbuf * 1337 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt) 1338 { 1339 struct ip6_ext ip6e; 1340 size_t elen; 1341 struct mbuf *n; 1342 1343 #ifdef DIAGNOSTIC 1344 switch (nxt) { 1345 case IPPROTO_DSTOPTS: 1346 case IPPROTO_ROUTING: 1347 case IPPROTO_HOPOPTS: 1348 case IPPROTO_AH: /* is it possible? */ 1349 break; 1350 default: 1351 printf("ip6_pullexthdr: invalid nxt=%d\n", nxt); 1352 } 1353 #endif 1354 1355 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1356 if (nxt == IPPROTO_AH) 1357 elen = (ip6e.ip6e_len + 2) << 2; 1358 else 1359 elen = (ip6e.ip6e_len + 1) << 3; 1360 1361 MGET(n, M_DONTWAIT, MT_DATA); 1362 if (n && elen >= MLEN) { 1363 MCLGET(n, M_DONTWAIT); 1364 if ((n->m_flags & M_EXT) == 0) { 1365 m_free(n); 1366 n = NULL; 1367 } 1368 } 1369 if (!n) 1370 return NULL; 1371 1372 n->m_len = 0; 1373 if (elen >= M_TRAILINGSPACE(n)) { 1374 m_free(n); 1375 return NULL; 1376 } 1377 1378 m_copydata(m, off, elen, mtod(n, void *)); 1379 n->m_len = elen; 1380 return n; 1381 } 1382 1383 /* 1384 * Get pointer to the previous header followed by the header 1385 * currently processed. 1386 * XXX: This function supposes that 1387 * M includes all headers, 1388 * the next header field and the header length field of each header 1389 * are valid, and 1390 * the sum of each header length equals to OFF. 1391 * Because of these assumptions, this function must be called very 1392 * carefully. Moreover, it will not be used in the near future when 1393 * we develop `neater' mechanism to process extension headers. 1394 */ 1395 u_int8_t * 1396 ip6_get_prevhdr(struct mbuf *m, int off) 1397 { 1398 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1399 1400 if (off == sizeof(struct ip6_hdr)) 1401 return (&ip6->ip6_nxt); 1402 else { 1403 int len, nxt; 1404 struct ip6_ext *ip6e = NULL; 1405 1406 nxt = ip6->ip6_nxt; 1407 len = sizeof(struct ip6_hdr); 1408 while (len < off) { 1409 ip6e = (struct ip6_ext *)(mtod(m, char *) + len); 1410 1411 switch (nxt) { 1412 case IPPROTO_FRAGMENT: 1413 len += sizeof(struct ip6_frag); 1414 break; 1415 case IPPROTO_AH: 1416 len += (ip6e->ip6e_len + 2) << 2; 1417 break; 1418 default: 1419 len += (ip6e->ip6e_len + 1) << 3; 1420 break; 1421 } 1422 nxt = ip6e->ip6e_nxt; 1423 } 1424 if (ip6e) 1425 return (&ip6e->ip6e_nxt); 1426 else 1427 return NULL; 1428 } 1429 } 1430 1431 /* 1432 * get next header offset. m will be retained. 1433 */ 1434 int 1435 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp) 1436 { 1437 struct ip6_hdr ip6; 1438 struct ip6_ext ip6e; 1439 struct ip6_frag fh; 1440 1441 /* just in case */ 1442 if (m == NULL) 1443 panic("ip6_nexthdr: m == NULL"); 1444 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off) 1445 return -1; 1446 1447 switch (proto) { 1448 case IPPROTO_IPV6: 1449 /* do not chase beyond intermediate IPv6 headers */ 1450 if (off != 0) 1451 return -1; 1452 if (m->m_pkthdr.len < off + sizeof(ip6)) 1453 return -1; 1454 m_copydata(m, off, sizeof(ip6), (void *)&ip6); 1455 if (nxtp) 1456 *nxtp = ip6.ip6_nxt; 1457 off += sizeof(ip6); 1458 return off; 1459 1460 case IPPROTO_FRAGMENT: 1461 /* 1462 * terminate parsing if it is not the first fragment, 1463 * it does not make sense to parse through it. 1464 */ 1465 if (m->m_pkthdr.len < off + sizeof(fh)) 1466 return -1; 1467 m_copydata(m, off, sizeof(fh), (void *)&fh); 1468 if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0) 1469 return -1; 1470 if (nxtp) 1471 *nxtp = fh.ip6f_nxt; 1472 off += sizeof(struct ip6_frag); 1473 return off; 1474 1475 case IPPROTO_AH: 1476 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1477 return -1; 1478 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1479 if (nxtp) 1480 *nxtp = ip6e.ip6e_nxt; 1481 off += (ip6e.ip6e_len + 2) << 2; 1482 if (m->m_pkthdr.len < off) 1483 return -1; 1484 return off; 1485 1486 case IPPROTO_HOPOPTS: 1487 case IPPROTO_ROUTING: 1488 case IPPROTO_DSTOPTS: 1489 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1490 return -1; 1491 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1492 if (nxtp) 1493 *nxtp = ip6e.ip6e_nxt; 1494 off += (ip6e.ip6e_len + 1) << 3; 1495 if (m->m_pkthdr.len < off) 1496 return -1; 1497 return off; 1498 1499 case IPPROTO_NONE: 1500 case IPPROTO_ESP: 1501 case IPPROTO_IPCOMP: 1502 /* give up */ 1503 return -1; 1504 1505 default: 1506 return -1; 1507 } 1508 } 1509 1510 /* 1511 * get offset for the last header in the chain. m will be kept untainted. 1512 */ 1513 int 1514 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp) 1515 { 1516 int newoff; 1517 int nxt; 1518 1519 if (!nxtp) { 1520 nxt = -1; 1521 nxtp = &nxt; 1522 } 1523 for (;;) { 1524 newoff = ip6_nexthdr(m, off, proto, nxtp); 1525 if (newoff < 0) 1526 return off; 1527 else if (newoff < off) 1528 return -1; /* invalid */ 1529 else if (newoff == off) 1530 return newoff; 1531 1532 off = newoff; 1533 proto = *nxtp; 1534 } 1535 } 1536 1537 struct m_tag * 1538 ip6_addaux(struct mbuf *m) 1539 { 1540 struct m_tag *mtag; 1541 1542 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1543 if (!mtag) { 1544 mtag = m_tag_get(PACKET_TAG_INET6, sizeof(struct ip6aux), 1545 M_NOWAIT); 1546 if (mtag) { 1547 m_tag_prepend(m, mtag); 1548 memset(mtag + 1, 0, sizeof(struct ip6aux)); 1549 } 1550 } 1551 return mtag; 1552 } 1553 1554 struct m_tag * 1555 ip6_findaux(struct mbuf *m) 1556 { 1557 struct m_tag *mtag; 1558 1559 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1560 return mtag; 1561 } 1562 1563 void 1564 ip6_delaux(struct mbuf *m) 1565 { 1566 struct m_tag *mtag; 1567 1568 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1569 if (mtag) 1570 m_tag_delete(m, mtag); 1571 } 1572 1573 /* 1574 * System control for IP6 1575 */ 1576 1577 const u_char inet6ctlerrmap[PRC_NCMDS] = { 1578 0, 0, 0, 0, 1579 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 1580 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 1581 EMSGSIZE, EHOSTUNREACH, 0, 0, 1582 0, 0, 0, 0, 1583 ENOPROTOOPT 1584 }; 1585 1586 extern int sysctl_net_inet6_addrctlpolicy(SYSCTLFN_ARGS); 1587 1588 static int 1589 sysctl_net_inet6_ip6_stats(SYSCTLFN_ARGS) 1590 { 1591 1592 return (NETSTAT_SYSCTL(ip6stat_percpu, IP6_NSTATS)); 1593 } 1594 1595 static void 1596 sysctl_net_inet6_ip6_setup(struct sysctllog **clog) 1597 { 1598 #ifdef RFC2292 1599 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y)) 1600 #else 1601 #define IS2292(x, y) (y) 1602 #endif 1603 1604 sysctl_createv(clog, 0, NULL, NULL, 1605 CTLFLAG_PERMANENT, 1606 CTLTYPE_NODE, "inet6", 1607 SYSCTL_DESCR("PF_INET6 related settings"), 1608 NULL, 0, NULL, 0, 1609 CTL_NET, PF_INET6, CTL_EOL); 1610 sysctl_createv(clog, 0, NULL, NULL, 1611 CTLFLAG_PERMANENT, 1612 CTLTYPE_NODE, "ip6", 1613 SYSCTL_DESCR("IPv6 related settings"), 1614 NULL, 0, NULL, 0, 1615 CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_EOL); 1616 1617 sysctl_createv(clog, 0, NULL, NULL, 1618 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1619 CTLTYPE_INT, "forwarding", 1620 SYSCTL_DESCR("Enable forwarding of INET6 datagrams"), 1621 NULL, 0, &ip6_forwarding, 0, 1622 CTL_NET, PF_INET6, IPPROTO_IPV6, 1623 IPV6CTL_FORWARDING, CTL_EOL); 1624 sysctl_createv(clog, 0, NULL, NULL, 1625 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1626 CTLTYPE_INT, "redirect", 1627 SYSCTL_DESCR("Enable sending of ICMPv6 redirect messages"), 1628 NULL, 0, &ip6_sendredirects, 0, 1629 CTL_NET, PF_INET6, IPPROTO_IPV6, 1630 IPV6CTL_SENDREDIRECTS, CTL_EOL); 1631 sysctl_createv(clog, 0, NULL, NULL, 1632 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1633 CTLTYPE_INT, "hlim", 1634 SYSCTL_DESCR("Hop limit for an INET6 datagram"), 1635 NULL, 0, &ip6_defhlim, 0, 1636 CTL_NET, PF_INET6, IPPROTO_IPV6, 1637 IPV6CTL_DEFHLIM, CTL_EOL); 1638 #ifdef notyet 1639 sysctl_createv(clog, 0, NULL, NULL, 1640 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1641 CTLTYPE_INT, "mtu", NULL, 1642 NULL, 0, &, 0, 1643 CTL_NET, PF_INET6, IPPROTO_IPV6, 1644 IPV6CTL_DEFMTU, CTL_EOL); 1645 #endif 1646 #ifdef __no_idea__ 1647 sysctl_createv(clog, 0, NULL, NULL, 1648 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1649 CTLTYPE_INT, "forwsrcrt", NULL, 1650 NULL, 0, &?, 0, 1651 CTL_NET, PF_INET6, IPPROTO_IPV6, 1652 IPV6CTL_FORWSRCRT, CTL_EOL); 1653 sysctl_createv(clog, 0, NULL, NULL, 1654 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1655 CTLTYPE_STRUCT, "mrtstats", NULL, 1656 NULL, 0, &?, sizeof(?), 1657 CTL_NET, PF_INET6, IPPROTO_IPV6, 1658 IPV6CTL_MRTSTATS, CTL_EOL); 1659 sysctl_createv(clog, 0, NULL, NULL, 1660 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1661 CTLTYPE_?, "mrtproto", NULL, 1662 NULL, 0, &?, sizeof(?), 1663 CTL_NET, PF_INET6, IPPROTO_IPV6, 1664 IPV6CTL_MRTPROTO, CTL_EOL); 1665 #endif 1666 sysctl_createv(clog, 0, NULL, NULL, 1667 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1668 CTLTYPE_INT, "maxfragpackets", 1669 SYSCTL_DESCR("Maximum number of fragments to buffer " 1670 "for reassembly"), 1671 NULL, 0, &ip6_maxfragpackets, 0, 1672 CTL_NET, PF_INET6, IPPROTO_IPV6, 1673 IPV6CTL_MAXFRAGPACKETS, CTL_EOL); 1674 #ifdef __no_idea__ 1675 sysctl_createv(clog, 0, NULL, NULL, 1676 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1677 CTLTYPE_INT, "sourcecheck", NULL, 1678 NULL, 0, &?, 0, 1679 CTL_NET, PF_INET6, IPPROTO_IPV6, 1680 IPV6CTL_SOURCECHECK, CTL_EOL); 1681 sysctl_createv(clog, 0, NULL, NULL, 1682 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1683 CTLTYPE_INT, "sourcecheck_logint", NULL, 1684 NULL, 0, &?, 0, 1685 CTL_NET, PF_INET6, IPPROTO_IPV6, 1686 IPV6CTL_SOURCECHECK_LOGINT, CTL_EOL); 1687 #endif 1688 sysctl_createv(clog, 0, NULL, NULL, 1689 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1690 CTLTYPE_INT, "accept_rtadv", 1691 SYSCTL_DESCR("Accept router advertisements"), 1692 NULL, 0, &ip6_accept_rtadv, 0, 1693 CTL_NET, PF_INET6, IPPROTO_IPV6, 1694 IPV6CTL_ACCEPT_RTADV, CTL_EOL); 1695 sysctl_createv(clog, 0, NULL, NULL, 1696 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1697 CTLTYPE_INT, "rtadv_maxroutes", 1698 SYSCTL_DESCR("Maximum number of routes accepted via router advertisements"), 1699 NULL, 0, &ip6_rtadv_maxroutes, 0, 1700 CTL_NET, PF_INET6, IPPROTO_IPV6, 1701 IPV6CTL_RTADV_MAXROUTES, CTL_EOL); 1702 sysctl_createv(clog, 0, NULL, NULL, 1703 CTLFLAG_PERMANENT, 1704 CTLTYPE_INT, "rtadv_numroutes", 1705 SYSCTL_DESCR("Current number of routes accepted via router advertisements"), 1706 NULL, 0, &nd6_numroutes, 0, 1707 CTL_NET, PF_INET6, IPPROTO_IPV6, 1708 IPV6CTL_RTADV_NUMROUTES, CTL_EOL); 1709 sysctl_createv(clog, 0, NULL, NULL, 1710 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1711 CTLTYPE_INT, "keepfaith", 1712 SYSCTL_DESCR("Activate faith interface"), 1713 NULL, 0, &ip6_keepfaith, 0, 1714 CTL_NET, PF_INET6, IPPROTO_IPV6, 1715 IPV6CTL_KEEPFAITH, CTL_EOL); 1716 sysctl_createv(clog, 0, NULL, NULL, 1717 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1718 CTLTYPE_INT, "log_interval", 1719 SYSCTL_DESCR("Minumum interval between logging " 1720 "unroutable packets"), 1721 NULL, 0, &ip6_log_interval, 0, 1722 CTL_NET, PF_INET6, IPPROTO_IPV6, 1723 IPV6CTL_LOG_INTERVAL, CTL_EOL); 1724 sysctl_createv(clog, 0, NULL, NULL, 1725 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1726 CTLTYPE_INT, "hdrnestlimit", 1727 SYSCTL_DESCR("Maximum number of nested IPv6 headers"), 1728 NULL, 0, &ip6_hdrnestlimit, 0, 1729 CTL_NET, PF_INET6, IPPROTO_IPV6, 1730 IPV6CTL_HDRNESTLIMIT, CTL_EOL); 1731 sysctl_createv(clog, 0, NULL, NULL, 1732 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1733 CTLTYPE_INT, "dad_count", 1734 SYSCTL_DESCR("Number of Duplicate Address Detection " 1735 "probes to send"), 1736 NULL, 0, &ip6_dad_count, 0, 1737 CTL_NET, PF_INET6, IPPROTO_IPV6, 1738 IPV6CTL_DAD_COUNT, CTL_EOL); 1739 sysctl_createv(clog, 0, NULL, NULL, 1740 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1741 CTLTYPE_INT, "auto_flowlabel", 1742 SYSCTL_DESCR("Assign random IPv6 flow labels"), 1743 NULL, 0, &ip6_auto_flowlabel, 0, 1744 CTL_NET, PF_INET6, IPPROTO_IPV6, 1745 IPV6CTL_AUTO_FLOWLABEL, CTL_EOL); 1746 sysctl_createv(clog, 0, NULL, NULL, 1747 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1748 CTLTYPE_INT, "defmcasthlim", 1749 SYSCTL_DESCR("Default multicast hop limit"), 1750 NULL, 0, &ip6_defmcasthlim, 0, 1751 CTL_NET, PF_INET6, IPPROTO_IPV6, 1752 IPV6CTL_DEFMCASTHLIM, CTL_EOL); 1753 sysctl_createv(clog, 0, NULL, NULL, 1754 CTLFLAG_PERMANENT, 1755 CTLTYPE_STRING, "kame_version", 1756 SYSCTL_DESCR("KAME Version"), 1757 NULL, 0, __UNCONST(__KAME_VERSION), 0, 1758 CTL_NET, PF_INET6, IPPROTO_IPV6, 1759 IPV6CTL_KAME_VERSION, CTL_EOL); 1760 sysctl_createv(clog, 0, NULL, NULL, 1761 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1762 CTLTYPE_INT, "use_deprecated", 1763 SYSCTL_DESCR("Allow use of deprecated addresses as " 1764 "source addresses"), 1765 NULL, 0, &ip6_use_deprecated, 0, 1766 CTL_NET, PF_INET6, IPPROTO_IPV6, 1767 IPV6CTL_USE_DEPRECATED, CTL_EOL); 1768 sysctl_createv(clog, 0, NULL, NULL, 1769 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1770 CTLTYPE_INT, "rr_prune", NULL, 1771 NULL, 0, &ip6_rr_prune, 0, 1772 CTL_NET, PF_INET6, IPPROTO_IPV6, 1773 IPV6CTL_RR_PRUNE, CTL_EOL); 1774 sysctl_createv(clog, 0, NULL, NULL, 1775 CTLFLAG_PERMANENT 1776 #ifndef INET6_BINDV6ONLY 1777 |CTLFLAG_READWRITE, 1778 #endif 1779 CTLTYPE_INT, "v6only", 1780 SYSCTL_DESCR("Disallow PF_INET6 sockets from connecting " 1781 "to PF_INET sockets"), 1782 NULL, 0, &ip6_v6only, 0, 1783 CTL_NET, PF_INET6, IPPROTO_IPV6, 1784 IPV6CTL_V6ONLY, CTL_EOL); 1785 sysctl_createv(clog, 0, NULL, NULL, 1786 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1787 CTLTYPE_INT, "anonportmin", 1788 SYSCTL_DESCR("Lowest ephemeral port number to assign"), 1789 sysctl_net_inet_ip_ports, 0, &ip6_anonportmin, 0, 1790 CTL_NET, PF_INET6, IPPROTO_IPV6, 1791 IPV6CTL_ANONPORTMIN, CTL_EOL); 1792 sysctl_createv(clog, 0, NULL, NULL, 1793 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1794 CTLTYPE_INT, "anonportmax", 1795 SYSCTL_DESCR("Highest ephemeral port number to assign"), 1796 sysctl_net_inet_ip_ports, 0, &ip6_anonportmax, 0, 1797 CTL_NET, PF_INET6, IPPROTO_IPV6, 1798 IPV6CTL_ANONPORTMAX, CTL_EOL); 1799 #ifndef IPNOPRIVPORTS 1800 sysctl_createv(clog, 0, NULL, NULL, 1801 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1802 CTLTYPE_INT, "lowportmin", 1803 SYSCTL_DESCR("Lowest privileged ephemeral port number " 1804 "to assign"), 1805 sysctl_net_inet_ip_ports, 0, &ip6_lowportmin, 0, 1806 CTL_NET, PF_INET6, IPPROTO_IPV6, 1807 IPV6CTL_LOWPORTMIN, CTL_EOL); 1808 sysctl_createv(clog, 0, NULL, NULL, 1809 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1810 CTLTYPE_INT, "lowportmax", 1811 SYSCTL_DESCR("Highest privileged ephemeral port number " 1812 "to assign"), 1813 sysctl_net_inet_ip_ports, 0, &ip6_lowportmax, 0, 1814 CTL_NET, PF_INET6, IPPROTO_IPV6, 1815 IPV6CTL_LOWPORTMAX, CTL_EOL); 1816 #endif /* IPNOPRIVPORTS */ 1817 sysctl_createv(clog, 0, NULL, NULL, 1818 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1819 CTLTYPE_INT, "auto_linklocal", 1820 SYSCTL_DESCR("Default value of per-interface flag for " 1821 "adding an IPv6 link-local address to " 1822 "interfaces when attached"), 1823 NULL, 0, &ip6_auto_linklocal, 0, 1824 CTL_NET, PF_INET6, IPPROTO_IPV6, 1825 IPV6CTL_AUTO_LINKLOCAL, CTL_EOL); 1826 sysctl_createv(clog, 0, NULL, NULL, 1827 CTLFLAG_PERMANENT|CTLFLAG_READONLY, 1828 CTLTYPE_STRUCT, "addctlpolicy", 1829 SYSCTL_DESCR("Return the current address control" 1830 " policy"), 1831 sysctl_net_inet6_addrctlpolicy, 0, NULL, 0, 1832 CTL_NET, PF_INET6, IPPROTO_IPV6, 1833 IPV6CTL_ADDRCTLPOLICY, CTL_EOL); 1834 sysctl_createv(clog, 0, NULL, NULL, 1835 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1836 CTLTYPE_INT, "use_tempaddr", 1837 SYSCTL_DESCR("Use temporary address"), 1838 NULL, 0, &ip6_use_tempaddr, 0, 1839 CTL_NET, PF_INET6, IPPROTO_IPV6, 1840 CTL_CREATE, CTL_EOL); 1841 sysctl_createv(clog, 0, NULL, NULL, 1842 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1843 CTLTYPE_INT, "prefer_tempaddr", 1844 SYSCTL_DESCR("Prefer temporary address as source " 1845 "address"), 1846 NULL, 0, &ip6_prefer_tempaddr, 0, 1847 CTL_NET, PF_INET6, IPPROTO_IPV6, 1848 CTL_CREATE, CTL_EOL); 1849 sysctl_createv(clog, 0, NULL, NULL, 1850 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1851 CTLTYPE_INT, "temppltime", 1852 SYSCTL_DESCR("preferred lifetime of a temporary address"), 1853 NULL, 0, &ip6_temp_preferred_lifetime, 0, 1854 CTL_NET, PF_INET6, IPPROTO_IPV6, 1855 CTL_CREATE, CTL_EOL); 1856 sysctl_createv(clog, 0, NULL, NULL, 1857 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1858 CTLTYPE_INT, "tempvltime", 1859 SYSCTL_DESCR("valid lifetime of a temporary address"), 1860 NULL, 0, &ip6_temp_valid_lifetime, 0, 1861 CTL_NET, PF_INET6, IPPROTO_IPV6, 1862 CTL_CREATE, CTL_EOL); 1863 sysctl_createv(clog, 0, NULL, NULL, 1864 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1865 CTLTYPE_INT, "maxfrags", 1866 SYSCTL_DESCR("Maximum fragments in reassembly queue"), 1867 NULL, 0, &ip6_maxfrags, 0, 1868 CTL_NET, PF_INET6, IPPROTO_IPV6, 1869 IPV6CTL_MAXFRAGS, CTL_EOL); 1870 sysctl_createv(clog, 0, NULL, NULL, 1871 CTLFLAG_PERMANENT, 1872 CTLTYPE_STRUCT, "stats", 1873 SYSCTL_DESCR("IPv6 statistics"), 1874 sysctl_net_inet6_ip6_stats, 0, NULL, 0, 1875 CTL_NET, PF_INET6, IPPROTO_IPV6, 1876 IPV6CTL_STATS, CTL_EOL); 1877 sysctl_createv(clog, 0, NULL, NULL, 1878 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1879 CTLTYPE_INT, "use_defaultzone", 1880 SYSCTL_DESCR("Whether to use the default scope zones"), 1881 NULL, 0, &ip6_use_defzone, 0, 1882 CTL_NET, PF_INET6, IPPROTO_IPV6, 1883 IPV6CTL_USE_DEFAULTZONE, CTL_EOL); 1884 sysctl_createv(clog, 0, NULL, NULL, 1885 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1886 CTLTYPE_INT, "mcast_pmtu", 1887 SYSCTL_DESCR("Enable pMTU discovery for multicast packet"), 1888 NULL, 0, &ip6_mcast_pmtu, 0, 1889 CTL_NET, PF_INET6, IPPROTO_IPV6, 1890 CTL_CREATE, CTL_EOL); 1891 /* anonportalgo RFC6056 subtree */ 1892 const struct sysctlnode *portalgo_node; 1893 sysctl_createv(clog, 0, NULL, &portalgo_node, 1894 CTLFLAG_PERMANENT, 1895 CTLTYPE_NODE, "anonportalgo", 1896 SYSCTL_DESCR("Anonymous port algorithm selection (RFC 6056)"), 1897 NULL, 0, NULL, 0, 1898 CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_CREATE, CTL_EOL); 1899 sysctl_createv(clog, 0, &portalgo_node, NULL, 1900 CTLFLAG_PERMANENT, 1901 CTLTYPE_STRING, "available", 1902 SYSCTL_DESCR("available algorithms"), 1903 sysctl_portalgo_available, 0, NULL, PORTALGO_MAXLEN, 1904 CTL_CREATE, CTL_EOL); 1905 sysctl_createv(clog, 0, &portalgo_node, NULL, 1906 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1907 CTLTYPE_STRING, "selected", 1908 SYSCTL_DESCR("selected algorithm"), 1909 sysctl_portalgo_selected6, 0, NULL, PORTALGO_MAXLEN, 1910 CTL_CREATE, CTL_EOL); 1911 sysctl_createv(clog, 0, &portalgo_node, NULL, 1912 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1913 CTLTYPE_STRUCT, "reserve", 1914 SYSCTL_DESCR("bitmap of reserved ports"), 1915 sysctl_portalgo_reserve6, 0, NULL, 0, 1916 CTL_CREATE, CTL_EOL); 1917 sysctl_createv(clog, 0, NULL, NULL, 1918 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1919 CTLTYPE_INT, "neighborgcthresh", 1920 SYSCTL_DESCR("Maximum number of entries in neighbor" 1921 " cache"), 1922 NULL, 1, &ip6_neighborgcthresh, 0, 1923 CTL_NET, PF_INET6, IPPROTO_IPV6, 1924 CTL_CREATE, CTL_EOL); 1925 sysctl_createv(clog, 0, NULL, NULL, 1926 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1927 CTLTYPE_INT, "maxifprefixes", 1928 SYSCTL_DESCR("Maximum number of prefixes created by" 1929 " route advertisement per interface"), 1930 NULL, 1, &ip6_maxifprefixes, 0, 1931 CTL_NET, PF_INET6, IPPROTO_IPV6, 1932 CTL_CREATE, CTL_EOL); 1933 sysctl_createv(clog, 0, NULL, NULL, 1934 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1935 CTLTYPE_INT, "maxifdefrouters", 1936 SYSCTL_DESCR("Maximum number of default routers created" 1937 " by route advertisement per interface"), 1938 NULL, 1, &ip6_maxifdefrouters, 0, 1939 CTL_NET, PF_INET6, IPPROTO_IPV6, 1940 CTL_CREATE, CTL_EOL); 1941 sysctl_createv(clog, 0, NULL, NULL, 1942 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1943 CTLTYPE_INT, "maxdynroutes", 1944 SYSCTL_DESCR("Maximum number of routes created via" 1945 " redirect"), 1946 NULL, 1, &ip6_maxdynroutes, 0, 1947 CTL_NET, PF_INET6, IPPROTO_IPV6, 1948 CTL_CREATE, CTL_EOL); 1949 } 1950 1951 void 1952 ip6_statinc(u_int stat) 1953 { 1954 1955 KASSERT(stat < IP6_NSTATS); 1956 IP6_STATINC(stat); 1957 } 1958