1 /* $NetBSD: ip6_input.c,v 1.177 2017/03/14 04:25:10 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 1.177 2017/03/14 04:25:10 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/mbuf.h> 79 #include <sys/domain.h> 80 #include <sys/protosw.h> 81 #include <sys/socket.h> 82 #include <sys/socketvar.h> 83 #include <sys/errno.h> 84 #include <sys/time.h> 85 #include <sys/kernel.h> 86 #include <sys/syslog.h> 87 #include <sys/proc.h> 88 #include <sys/sysctl.h> 89 #include <sys/cprng.h> 90 #include <sys/percpu.h> 91 92 #include <net/if.h> 93 #include <net/if_types.h> 94 #include <net/if_dl.h> 95 #include <net/route.h> 96 #include <net/pktqueue.h> 97 #include <net/pfil.h> 98 99 #include <netinet/in.h> 100 #include <netinet/in_systm.h> 101 #ifdef INET 102 #include <netinet/ip.h> 103 #include <netinet/ip_var.h> 104 #include <netinet/ip_icmp.h> 105 #endif /* INET */ 106 #include <netinet/ip6.h> 107 #include <netinet/portalgo.h> 108 #include <netinet6/in6_var.h> 109 #include <netinet6/ip6_var.h> 110 #include <netinet6/ip6_private.h> 111 #include <netinet6/in6_pcb.h> 112 #include <netinet/icmp6.h> 113 #include <netinet6/scope6_var.h> 114 #include <netinet6/in6_ifattach.h> 115 #include <netinet6/nd6.h> 116 117 #ifdef IPSEC 118 #include <netipsec/ipsec.h> 119 #include <netipsec/ipsec6.h> 120 #include <netipsec/key.h> 121 #endif /* IPSEC */ 122 123 #ifdef COMPAT_50 124 #include <compat/sys/time.h> 125 #include <compat/sys/socket.h> 126 #endif 127 128 #include <netinet6/ip6protosw.h> 129 130 #include "faith.h" 131 132 #include <net/net_osdep.h> 133 134 extern struct domain inet6domain; 135 136 u_char ip6_protox[IPPROTO_MAX]; 137 pktqueue_t *ip6_pktq __read_mostly; 138 139 int ip6_forward_srcrt; /* XXX */ 140 int ip6_sourcecheck; /* XXX */ 141 int ip6_sourcecheck_interval; /* XXX */ 142 143 pfil_head_t *inet6_pfil_hook; 144 145 percpu_t *ip6stat_percpu; 146 147 percpu_t *ip6_forward_rt_percpu __cacheline_aligned; 148 149 static void ip6_init2(void); 150 static void ip6intr(void *); 151 static struct m_tag *ip6_setdstifaddr(struct mbuf *, const struct in6_ifaddr *); 152 153 static int ip6_process_hopopts(struct mbuf *, u_int8_t *, int, u_int32_t *, 154 u_int32_t *); 155 static struct mbuf *ip6_pullexthdr(struct mbuf *, size_t, int); 156 static void sysctl_net_inet6_ip6_setup(struct sysctllog **); 157 158 #ifdef NET_MPSAFE 159 #define SOFTNET_LOCK() mutex_enter(softnet_lock) 160 #define SOFTNET_UNLOCK() mutex_exit(softnet_lock) 161 #else 162 #define SOFTNET_LOCK() KASSERT(mutex_owned(softnet_lock)) 163 #define SOFTNET_UNLOCK() KASSERT(mutex_owned(softnet_lock)) 164 #endif 165 166 /* 167 * IP6 initialization: fill in IP6 protocol switch table. 168 * All protocols not implemented in kernel go to raw IP6 protocol handler. 169 */ 170 void 171 ip6_init(void) 172 { 173 const struct ip6protosw *pr; 174 int i; 175 176 in6_init(); 177 178 sysctl_net_inet6_ip6_setup(NULL); 179 pr = (const struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 180 if (pr == 0) 181 panic("ip6_init"); 182 for (i = 0; i < IPPROTO_MAX; i++) 183 ip6_protox[i] = pr - inet6sw; 184 for (pr = (const struct ip6protosw *)inet6domain.dom_protosw; 185 pr < (const struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++) 186 if (pr->pr_domain->dom_family == PF_INET6 && 187 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) 188 ip6_protox[pr->pr_protocol] = pr - inet6sw; 189 190 ip6_pktq = pktq_create(IFQ_MAXLEN, ip6intr, NULL); 191 KASSERT(ip6_pktq != NULL); 192 193 scope6_init(); 194 addrsel_policy_init(); 195 nd6_init(); 196 frag6_init(); 197 ip6_desync_factor = cprng_fast32() % MAX_TEMP_DESYNC_FACTOR; 198 199 ip6_init2(); 200 #ifdef GATEWAY 201 ip6flow_init(ip6_hashsize); 202 #endif 203 /* Register our Packet Filter hook. */ 204 inet6_pfil_hook = pfil_head_create(PFIL_TYPE_AF, (void *)AF_INET6); 205 KASSERT(inet6_pfil_hook != NULL); 206 207 ip6stat_percpu = percpu_alloc(sizeof(uint64_t) * IP6_NSTATS); 208 209 ip6_forward_rt_percpu = percpu_alloc(sizeof(struct route)); 210 if (ip6_forward_rt_percpu == NULL) 211 panic("failed to alllocate ip6_forward_rt_percpu"); 212 } 213 214 static void 215 ip6_init2(void) 216 { 217 218 /* timer for regeneranation of temporary addresses randomize ID */ 219 callout_init(&in6_tmpaddrtimer_ch, CALLOUT_MPSAFE); 220 callout_reset(&in6_tmpaddrtimer_ch, 221 (ip6_temp_preferred_lifetime - ip6_desync_factor - 222 ip6_temp_regen_advance) * hz, 223 in6_tmpaddrtimer, NULL); 224 } 225 226 /* 227 * IP6 input interrupt handling. Just pass the packet to ip6_input. 228 */ 229 static void 230 ip6intr(void *arg __unused) 231 { 232 struct mbuf *m; 233 234 #ifndef NET_MPSAFE 235 mutex_enter(softnet_lock); 236 #endif 237 while ((m = pktq_dequeue(ip6_pktq)) != NULL) { 238 struct psref psref; 239 struct ifnet *rcvif = m_get_rcvif_psref(m, &psref); 240 241 if (rcvif == NULL) { 242 m_freem(m); 243 continue; 244 } 245 /* 246 * Drop the packet if IPv6 is disabled on the interface. 247 */ 248 if ((ND_IFINFO(rcvif)->flags & ND6_IFF_IFDISABLED)) { 249 m_put_rcvif_psref(rcvif, &psref); 250 m_freem(m); 251 continue; 252 } 253 ip6_input(m, rcvif); 254 m_put_rcvif_psref(rcvif, &psref); 255 } 256 #ifndef NET_MPSAFE 257 mutex_exit(softnet_lock); 258 #endif 259 } 260 261 void 262 ip6_input(struct mbuf *m, struct ifnet *rcvif) 263 { 264 struct ip6_hdr *ip6; 265 int hit, off = sizeof(struct ip6_hdr), nest; 266 u_int32_t plen; 267 u_int32_t rtalert = ~0; 268 int nxt, ours = 0, rh_present = 0; 269 struct ifnet *deliverifp = NULL; 270 int srcrt = 0; 271 struct rtentry *rt = NULL; 272 union { 273 struct sockaddr dst; 274 struct sockaddr_in6 dst6; 275 } u; 276 struct route *ro; 277 278 /* 279 * make sure we don't have onion peering information into m_tag. 280 */ 281 ip6_delaux(m); 282 283 /* 284 * mbuf statistics 285 */ 286 if (m->m_flags & M_EXT) { 287 if (m->m_next) 288 IP6_STATINC(IP6_STAT_MEXT2M); 289 else 290 IP6_STATINC(IP6_STAT_MEXT1); 291 } else { 292 #define M2MMAX 32 293 if (m->m_next) { 294 if (m->m_flags & M_LOOP) 295 /*XXX*/ IP6_STATINC(IP6_STAT_M2M + lo0ifp->if_index); 296 else if (rcvif->if_index < M2MMAX) 297 IP6_STATINC(IP6_STAT_M2M + rcvif->if_index); 298 else 299 IP6_STATINC(IP6_STAT_M2M); 300 } else 301 IP6_STATINC(IP6_STAT_M1); 302 #undef M2MMAX 303 } 304 305 in6_ifstat_inc(rcvif, ifs6_in_receive); 306 IP6_STATINC(IP6_STAT_TOTAL); 307 308 /* 309 * If the IPv6 header is not aligned, slurp it up into a new 310 * mbuf with space for link headers, in the event we forward 311 * it. Otherwise, if it is aligned, make sure the entire base 312 * IPv6 header is in the first mbuf of the chain. 313 */ 314 if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 315 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 316 (max_linkhdr + 3) & ~3)) == NULL) { 317 /* XXXJRT new stat, please */ 318 IP6_STATINC(IP6_STAT_TOOSMALL); 319 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 320 return; 321 } 322 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 323 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 324 IP6_STATINC(IP6_STAT_TOOSMALL); 325 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 326 return; 327 } 328 } 329 330 ip6 = mtod(m, struct ip6_hdr *); 331 332 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 333 IP6_STATINC(IP6_STAT_BADVERS); 334 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 335 goto bad; 336 } 337 338 /* 339 * Assume that we can create a fast-forward IP flow entry 340 * based on this packet. 341 */ 342 m->m_flags |= M_CANFASTFWD; 343 344 /* 345 * Run through list of hooks for input packets. If there are any 346 * filters which require that additional packets in the flow are 347 * not fast-forwarded, they must clear the M_CANFASTFWD flag. 348 * Note that filters must _never_ set this flag, as another filter 349 * in the list may have previously cleared it. 350 */ 351 /* 352 * let ipfilter look at packet on the wire, 353 * not the decapsulated packet. 354 */ 355 #if defined(IPSEC) 356 if (!ipsec_used || !ipsec_indone(m)) 357 #else 358 if (1) 359 #endif 360 { 361 struct in6_addr odst; 362 363 odst = ip6->ip6_dst; 364 if (pfil_run_hooks(inet6_pfil_hook, &m, rcvif, PFIL_IN) != 0) 365 return; 366 if (m == NULL) 367 return; 368 ip6 = mtod(m, struct ip6_hdr *); 369 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst); 370 } 371 372 IP6_STATINC(IP6_STAT_NXTHIST + ip6->ip6_nxt); 373 374 #ifdef ALTQ 375 if (altq_input != NULL) { 376 SOFTNET_LOCK(); 377 if ((*altq_input)(m, AF_INET6) == 0) { 378 SOFTNET_UNLOCK(); 379 /* packet is dropped by traffic conditioner */ 380 return; 381 } 382 SOFTNET_UNLOCK(); 383 } 384 #endif 385 386 /* 387 * Check against address spoofing/corruption. 388 */ 389 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) || 390 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) { 391 /* 392 * XXX: "badscope" is not very suitable for a multicast source. 393 */ 394 IP6_STATINC(IP6_STAT_BADSCOPE); 395 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 396 goto bad; 397 } 398 /* 399 * The following check is not documented in specs. A malicious 400 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack 401 * and bypass security checks (act as if it was from 127.0.0.1 by using 402 * IPv6 src ::ffff:127.0.0.1). Be cautious. 403 * 404 * This check chokes if we are in an SIIT cloud. As none of BSDs 405 * support IPv4-less kernel compilation, we cannot support SIIT 406 * environment at all. So, it makes more sense for us to reject any 407 * malicious packets for non-SIIT environment, than try to do a 408 * partial support for SIIT environment. 409 */ 410 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 411 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 412 IP6_STATINC(IP6_STAT_BADSCOPE); 413 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 414 goto bad; 415 } 416 #if 0 417 /* 418 * Reject packets with IPv4 compatible addresses (auto tunnel). 419 * 420 * The code forbids auto tunnel relay case in RFC1933 (the check is 421 * stronger than RFC1933). We may want to re-enable it if mech-xx 422 * is revised to forbid relaying case. 423 */ 424 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) || 425 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) { 426 IP6_STATINC(IP6_STAT_BADSCOPE); 427 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 428 goto bad; 429 } 430 #endif 431 432 /* 433 * Disambiguate address scope zones (if there is ambiguity). 434 * We first make sure that the original source or destination address 435 * is not in our internal form for scoped addresses. Such addresses 436 * are not necessarily invalid spec-wise, but we cannot accept them due 437 * to the usage conflict. 438 * in6_setscope() then also checks and rejects the cases where src or 439 * dst are the loopback address and the receiving interface 440 * is not loopback. 441 */ 442 if (__predict_false( 443 m_makewritable(&m, 0, sizeof(struct ip6_hdr), M_DONTWAIT))) 444 goto bad; 445 ip6 = mtod(m, struct ip6_hdr *); 446 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) { 447 IP6_STATINC(IP6_STAT_BADSCOPE); /* XXX */ 448 goto bad; 449 } 450 if (in6_setscope(&ip6->ip6_src, rcvif, NULL) || 451 in6_setscope(&ip6->ip6_dst, rcvif, NULL)) { 452 IP6_STATINC(IP6_STAT_BADSCOPE); 453 goto bad; 454 } 455 456 ro = percpu_getref(ip6_forward_rt_percpu); 457 /* 458 * Multicast check 459 */ 460 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 461 bool ingroup; 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 ingroup = in6_multi_group(&ip6->ip6_dst, rcvif); 469 if (ingroup) 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_unref; 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 rt = rtcache_lookup2(ro, &u.dst, 1, &hit); 489 if (hit) 490 IP6_STATINC(IP6_STAT_FORWARD_CACHEHIT); 491 else 492 IP6_STATINC(IP6_STAT_FORWARD_CACHEMISS); 493 494 #define rt6_getkey(__rt) satocsin6(rt_getkey(__rt)) 495 496 /* 497 * Accept the packet if the forwarding interface to the destination 498 * according to the routing table is the loopback interface, 499 * unless the associated route has a gateway. 500 * Note that this approach causes to accept a packet if there is a 501 * route to the loopback interface for the destination of the packet. 502 * But we think it's even useful in some situations, e.g. when using 503 * a special daemon which wants to intercept the packet. 504 */ 505 if (rt != NULL && 506 (rt->rt_flags & (RTF_HOST|RTF_GATEWAY)) == RTF_HOST && 507 #if 0 508 /* 509 * The check below is redundant since the comparison of 510 * the destination and the key of the rtentry has 511 * already done through looking up the routing table. 512 */ 513 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &rt6_getkey(rt)->sin6_addr) && 514 #endif 515 rt->rt_ifp->if_type == IFT_LOOP) { 516 struct in6_ifaddr *ia6 = (struct in6_ifaddr *)rt->rt_ifa; 517 if (ia6->ia6_flags & IN6_IFF_ANYCAST) 518 m->m_flags |= M_ANYCAST6; 519 /* 520 * packets to a tentative, duplicated, or somehow invalid 521 * address must not be accepted. 522 */ 523 if (!(ia6->ia6_flags & (IN6_IFF_NOTREADY | IN6_IFF_DETACHED))) { 524 /* this address is ready */ 525 ours = 1; 526 deliverifp = ia6->ia_ifp; /* correct? */ 527 goto hbhcheck; 528 } else { 529 /* address is not ready, so discard the packet. */ 530 char ip6bufs[INET6_ADDRSTRLEN]; 531 char ip6bufd[INET6_ADDRSTRLEN]; 532 nd6log(LOG_INFO, "packet to an unready address %s->%s\n", 533 IN6_PRINT(ip6bufs, &ip6->ip6_src), 534 IN6_PRINT(ip6bufd, &ip6->ip6_dst)); 535 536 goto bad_unref; 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_unref; 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 rtcache_unref(rt, ro); 622 percpu_putref(ip6_forward_rt_percpu); 623 return; /* m have already been freed */ 624 } 625 626 /* adjust pointer */ 627 ip6 = mtod(m, struct ip6_hdr *); 628 629 /* 630 * if the payload length field is 0 and the next header field 631 * indicates Hop-by-Hop Options header, then a Jumbo Payload 632 * option MUST be included. 633 */ 634 if (ip6->ip6_plen == 0 && plen == 0) { 635 /* 636 * Note that if a valid jumbo payload option is 637 * contained, ip6_hopopts_input() must set a valid 638 * (non-zero) payload length to the variable plen. 639 */ 640 IP6_STATINC(IP6_STAT_BADOPTIONS); 641 in6_ifstat_inc(rcvif, ifs6_in_discard); 642 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 643 icmp6_error(m, ICMP6_PARAM_PROB, 644 ICMP6_PARAMPROB_HEADER, 645 (char *)&ip6->ip6_plen - (char *)ip6); 646 rtcache_unref(rt, ro); 647 percpu_putref(ip6_forward_rt_percpu); 648 return; 649 } 650 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 651 sizeof(struct ip6_hbh)); 652 if (hbh == NULL) { 653 IP6_STATINC(IP6_STAT_TOOSHORT); 654 rtcache_unref(rt, ro); 655 percpu_putref(ip6_forward_rt_percpu); 656 return; 657 } 658 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 659 nxt = hbh->ip6h_nxt; 660 661 /* 662 * accept the packet if a router alert option is included 663 * and we act as an IPv6 router. 664 */ 665 if (rtalert != ~0 && ip6_forwarding) 666 ours = 1; 667 } else 668 nxt = ip6->ip6_nxt; 669 670 /* 671 * Check that the amount of data in the buffers 672 * is as at least much as the IPv6 header would have us expect. 673 * Trim mbufs if longer than we expect. 674 * Drop packet if shorter than we expect. 675 */ 676 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 677 IP6_STATINC(IP6_STAT_TOOSHORT); 678 in6_ifstat_inc(rcvif, ifs6_in_truncated); 679 goto bad_unref; 680 } 681 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 682 if (m->m_len == m->m_pkthdr.len) { 683 m->m_len = sizeof(struct ip6_hdr) + plen; 684 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 685 } else 686 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 687 } 688 689 /* 690 * Forward if desirable. 691 */ 692 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 693 /* 694 * If we are acting as a multicast router, all 695 * incoming multicast packets are passed to the 696 * kernel-level multicast forwarding function. 697 * The packet is returned (relatively) intact; if 698 * ip6_mforward() returns a non-zero value, the packet 699 * must be discarded, else it may be accepted below. 700 */ 701 if (ip6_mrouter != NULL) { 702 int error; 703 704 SOFTNET_LOCK(); 705 error = ip6_mforward(ip6, rcvif, m); 706 SOFTNET_UNLOCK(); 707 708 if (error != 0) { 709 rtcache_unref(rt, ro); 710 percpu_putref(ip6_forward_rt_percpu); 711 IP6_STATINC(IP6_STAT_CANTFORWARD); 712 goto bad; 713 } 714 } 715 if (!ours) 716 goto bad_unref; 717 } else if (!ours) { 718 rtcache_unref(rt, ro); 719 percpu_putref(ip6_forward_rt_percpu); 720 ip6_forward(m, srcrt); 721 return; 722 } 723 724 ip6 = mtod(m, struct ip6_hdr *); 725 726 /* 727 * Malicious party may be able to use IPv4 mapped addr to confuse 728 * tcp/udp stack and bypass security checks (act as if it was from 729 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious. 730 * 731 * For SIIT end node behavior, you may want to disable the check. 732 * However, you will become vulnerable to attacks using IPv4 mapped 733 * source. 734 */ 735 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 736 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 737 IP6_STATINC(IP6_STAT_BADSCOPE); 738 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 739 goto bad_unref; 740 } 741 742 /* 743 * Tell launch routine the next header 744 */ 745 #ifdef IFA_STATS 746 if (deliverifp != NULL) { 747 struct in6_ifaddr *ia6; 748 int s = pserialize_read_enter(); 749 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 750 if (ia6) 751 ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len; 752 pserialize_read_exit(s); 753 } 754 #endif 755 IP6_STATINC(IP6_STAT_DELIVERED); 756 in6_ifstat_inc(deliverifp, ifs6_in_deliver); 757 nest = 0; 758 759 if (rt != NULL) { 760 rtcache_unref(rt, ro); 761 rt = NULL; 762 } 763 percpu_putref(ip6_forward_rt_percpu); 764 765 rh_present = 0; 766 while (nxt != IPPROTO_DONE) { 767 if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) { 768 IP6_STATINC(IP6_STAT_TOOMANYHDR); 769 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 770 goto bad; 771 } 772 773 /* 774 * protection against faulty packet - there should be 775 * more sanity checks in header chain processing. 776 */ 777 if (m->m_pkthdr.len < off) { 778 IP6_STATINC(IP6_STAT_TOOSHORT); 779 in6_ifstat_inc(rcvif, ifs6_in_truncated); 780 goto bad; 781 } 782 783 if (nxt == IPPROTO_ROUTING) { 784 if (rh_present++) { 785 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 786 IP6_STATINC(IP6_STAT_BADOPTIONS); 787 goto bad; 788 } 789 } 790 791 #ifdef IPSEC 792 if (ipsec_used) { 793 /* 794 * enforce IPsec policy checking if we are seeing last 795 * header. note that we do not visit this with 796 * protocols with pcb layer code - like udp/tcp/raw ip. 797 */ 798 if ((inet6sw[ip_protox[nxt]].pr_flags 799 & PR_LASTHDR) != 0) { 800 int error; 801 802 SOFTNET_LOCK(); 803 error = ipsec6_input(m); 804 SOFTNET_UNLOCK(); 805 if (error) 806 goto bad; 807 } 808 } 809 #endif /* IPSEC */ 810 811 SOFTNET_LOCK(); 812 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt); 813 SOFTNET_UNLOCK(); 814 } 815 return; 816 817 bad_unref: 818 rtcache_unref(rt, ro); 819 percpu_putref(ip6_forward_rt_percpu); 820 bad: 821 m_freem(m); 822 return; 823 } 824 825 /* 826 * set/grab in6_ifaddr correspond to IPv6 destination address. 827 */ 828 static struct m_tag * 829 ip6_setdstifaddr(struct mbuf *m, const struct in6_ifaddr *ia) 830 { 831 struct m_tag *mtag; 832 struct ip6aux *ip6a; 833 834 mtag = ip6_addaux(m); 835 if (mtag == NULL) 836 return NULL; 837 838 ip6a = (struct ip6aux *)(mtag + 1); 839 if (in6_setscope(&ip6a->ip6a_src, ia->ia_ifp, &ip6a->ip6a_scope_id)) { 840 IP6_STATINC(IP6_STAT_BADSCOPE); 841 return NULL; 842 } 843 844 ip6a->ip6a_src = ia->ia_addr.sin6_addr; 845 ip6a->ip6a_flags = ia->ia6_flags; 846 return mtag; 847 } 848 849 const struct ip6aux * 850 ip6_getdstifaddr(struct mbuf *m) 851 { 852 struct m_tag *mtag; 853 854 mtag = ip6_findaux(m); 855 if (mtag != NULL) 856 return (struct ip6aux *)(mtag + 1); 857 else 858 return NULL; 859 } 860 861 /* 862 * Hop-by-Hop options header processing. If a valid jumbo payload option is 863 * included, the real payload length will be stored in plenp. 864 * 865 * rtalertp - XXX: should be stored more smart way 866 */ 867 int 868 ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp, 869 struct mbuf **mp, int *offp) 870 { 871 struct mbuf *m = *mp; 872 int off = *offp, hbhlen; 873 struct ip6_hbh *hbh; 874 875 /* validation of the length of the header */ 876 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, 877 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh)); 878 if (hbh == NULL) { 879 IP6_STATINC(IP6_STAT_TOOSHORT); 880 return -1; 881 } 882 hbhlen = (hbh->ip6h_len + 1) << 3; 883 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 884 hbhlen); 885 if (hbh == NULL) { 886 IP6_STATINC(IP6_STAT_TOOSHORT); 887 return -1; 888 } 889 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 890 off += hbhlen; 891 hbhlen -= sizeof(struct ip6_hbh); 892 893 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 894 hbhlen, rtalertp, plenp) < 0) 895 return (-1); 896 897 *offp = off; 898 *mp = m; 899 return (0); 900 } 901 902 /* 903 * Search header for all Hop-by-hop options and process each option. 904 * This function is separate from ip6_hopopts_input() in order to 905 * handle a case where the sending node itself process its hop-by-hop 906 * options header. In such a case, the function is called from ip6_output(). 907 * 908 * The function assumes that hbh header is located right after the IPv6 header 909 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to 910 * opthead + hbhlen is located in continuous memory region. 911 */ 912 static int 913 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen, 914 u_int32_t *rtalertp, u_int32_t *plenp) 915 { 916 struct ip6_hdr *ip6; 917 int optlen = 0; 918 u_int8_t *opt = opthead; 919 u_int16_t rtalert_val; 920 u_int32_t jumboplen; 921 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh); 922 923 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 924 switch (*opt) { 925 case IP6OPT_PAD1: 926 optlen = 1; 927 break; 928 case IP6OPT_PADN: 929 if (hbhlen < IP6OPT_MINLEN) { 930 IP6_STATINC(IP6_STAT_TOOSMALL); 931 goto bad; 932 } 933 optlen = *(opt + 1) + 2; 934 break; 935 case IP6OPT_RTALERT: 936 /* XXX may need check for alignment */ 937 if (hbhlen < IP6OPT_RTALERT_LEN) { 938 IP6_STATINC(IP6_STAT_TOOSMALL); 939 goto bad; 940 } 941 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) { 942 /* XXX stat */ 943 icmp6_error(m, ICMP6_PARAM_PROB, 944 ICMP6_PARAMPROB_HEADER, 945 erroff + opt + 1 - opthead); 946 return (-1); 947 } 948 optlen = IP6OPT_RTALERT_LEN; 949 memcpy((void *)&rtalert_val, (void *)(opt + 2), 2); 950 *rtalertp = ntohs(rtalert_val); 951 break; 952 case IP6OPT_JUMBO: 953 /* XXX may need check for alignment */ 954 if (hbhlen < IP6OPT_JUMBO_LEN) { 955 IP6_STATINC(IP6_STAT_TOOSMALL); 956 goto bad; 957 } 958 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) { 959 /* XXX stat */ 960 icmp6_error(m, ICMP6_PARAM_PROB, 961 ICMP6_PARAMPROB_HEADER, 962 erroff + opt + 1 - opthead); 963 return (-1); 964 } 965 optlen = IP6OPT_JUMBO_LEN; 966 967 /* 968 * IPv6 packets that have non 0 payload length 969 * must not contain a jumbo payload option. 970 */ 971 ip6 = mtod(m, struct ip6_hdr *); 972 if (ip6->ip6_plen) { 973 IP6_STATINC(IP6_STAT_BADOPTIONS); 974 icmp6_error(m, ICMP6_PARAM_PROB, 975 ICMP6_PARAMPROB_HEADER, 976 erroff + opt - opthead); 977 return (-1); 978 } 979 980 /* 981 * We may see jumbolen in unaligned location, so 982 * we'd need to perform bcopy(). 983 */ 984 memcpy(&jumboplen, opt + 2, sizeof(jumboplen)); 985 jumboplen = (u_int32_t)htonl(jumboplen); 986 987 #if 1 988 /* 989 * if there are multiple jumbo payload options, 990 * *plenp will be non-zero and the packet will be 991 * rejected. 992 * the behavior may need some debate in ipngwg - 993 * multiple options does not make sense, however, 994 * there's no explicit mention in specification. 995 */ 996 if (*plenp != 0) { 997 IP6_STATINC(IP6_STAT_BADOPTIONS); 998 icmp6_error(m, ICMP6_PARAM_PROB, 999 ICMP6_PARAMPROB_HEADER, 1000 erroff + opt + 2 - opthead); 1001 return (-1); 1002 } 1003 #endif 1004 1005 /* 1006 * jumbo payload length must be larger than 65535. 1007 */ 1008 if (jumboplen <= IPV6_MAXPACKET) { 1009 IP6_STATINC(IP6_STAT_BADOPTIONS); 1010 icmp6_error(m, ICMP6_PARAM_PROB, 1011 ICMP6_PARAMPROB_HEADER, 1012 erroff + opt + 2 - opthead); 1013 return (-1); 1014 } 1015 *plenp = jumboplen; 1016 1017 break; 1018 default: /* unknown option */ 1019 if (hbhlen < IP6OPT_MINLEN) { 1020 IP6_STATINC(IP6_STAT_TOOSMALL); 1021 goto bad; 1022 } 1023 optlen = ip6_unknown_opt(opt, m, 1024 erroff + opt - opthead); 1025 if (optlen == -1) 1026 return (-1); 1027 optlen += 2; 1028 break; 1029 } 1030 } 1031 1032 return (0); 1033 1034 bad: 1035 m_freem(m); 1036 return (-1); 1037 } 1038 1039 /* 1040 * Unknown option processing. 1041 * The third argument `off' is the offset from the IPv6 header to the option, 1042 * which is necessary if the IPv6 header the and option header and IPv6 header 1043 * is not continuous in order to return an ICMPv6 error. 1044 */ 1045 int 1046 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off) 1047 { 1048 struct ip6_hdr *ip6; 1049 1050 switch (IP6OPT_TYPE(*optp)) { 1051 case IP6OPT_TYPE_SKIP: /* ignore the option */ 1052 return ((int)*(optp + 1)); 1053 case IP6OPT_TYPE_DISCARD: /* silently discard */ 1054 m_freem(m); 1055 return (-1); 1056 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 1057 IP6_STATINC(IP6_STAT_BADOPTIONS); 1058 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 1059 return (-1); 1060 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 1061 IP6_STATINC(IP6_STAT_BADOPTIONS); 1062 ip6 = mtod(m, struct ip6_hdr *); 1063 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 1064 (m->m_flags & (M_BCAST|M_MCAST))) 1065 m_freem(m); 1066 else 1067 icmp6_error(m, ICMP6_PARAM_PROB, 1068 ICMP6_PARAMPROB_OPTION, off); 1069 return (-1); 1070 } 1071 1072 m_freem(m); /* XXX: NOTREACHED */ 1073 return (-1); 1074 } 1075 1076 /* 1077 * Create the "control" list for this pcb. 1078 * 1079 * The routine will be called from upper layer handlers like tcp6_input(). 1080 * Thus the routine assumes that the caller (tcp6_input) have already 1081 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the 1082 * very first mbuf on the mbuf chain. 1083 * We may want to add some infinite loop prevention or sanity checks for safety. 1084 * (This applies only when you are using KAME mbuf chain restriction, i.e. 1085 * you are using IP6_EXTHDR_CHECK() not m_pulldown()) 1086 */ 1087 void 1088 ip6_savecontrol(struct in6pcb *in6p, struct mbuf **mp, 1089 struct ip6_hdr *ip6, struct mbuf *m) 1090 { 1091 #ifdef RFC2292 1092 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y)) 1093 #else 1094 #define IS2292(x, y) (y) 1095 #endif 1096 1097 if (in6p->in6p_socket->so_options & SO_TIMESTAMP 1098 #ifdef SO_OTIMESTAMP 1099 || in6p->in6p_socket->so_options & SO_OTIMESTAMP 1100 #endif 1101 ) { 1102 struct timeval tv; 1103 1104 microtime(&tv); 1105 #ifdef SO_OTIMESTAMP 1106 if (in6p->in6p_socket->so_options & SO_OTIMESTAMP) { 1107 struct timeval50 tv50; 1108 timeval_to_timeval50(&tv, &tv50); 1109 *mp = sbcreatecontrol((void *) &tv50, sizeof(tv50), 1110 SCM_OTIMESTAMP, SOL_SOCKET); 1111 } else 1112 #endif 1113 *mp = sbcreatecontrol((void *) &tv, sizeof(tv), 1114 SCM_TIMESTAMP, SOL_SOCKET); 1115 if (*mp) 1116 mp = &(*mp)->m_next; 1117 } 1118 1119 /* some OSes call this logic with IPv4 packet, for SO_TIMESTAMP */ 1120 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) 1121 return; 1122 1123 /* RFC 2292 sec. 5 */ 1124 if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) { 1125 struct in6_pktinfo pi6; 1126 1127 memcpy(&pi6.ipi6_addr, &ip6->ip6_dst, sizeof(struct in6_addr)); 1128 in6_clearscope(&pi6.ipi6_addr); /* XXX */ 1129 pi6.ipi6_ifindex = m->m_pkthdr.rcvif_index; 1130 *mp = sbcreatecontrol((void *) &pi6, 1131 sizeof(struct in6_pktinfo), 1132 IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6); 1133 if (*mp) 1134 mp = &(*mp)->m_next; 1135 } 1136 1137 if (in6p->in6p_flags & IN6P_HOPLIMIT) { 1138 int hlim = ip6->ip6_hlim & 0xff; 1139 1140 *mp = sbcreatecontrol((void *) &hlim, sizeof(int), 1141 IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6); 1142 if (*mp) 1143 mp = &(*mp)->m_next; 1144 } 1145 1146 if ((in6p->in6p_flags & IN6P_TCLASS) != 0) { 1147 u_int32_t flowinfo; 1148 int tclass; 1149 1150 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK); 1151 flowinfo >>= 20; 1152 1153 tclass = flowinfo & 0xff; 1154 *mp = sbcreatecontrol((void *)&tclass, sizeof(tclass), 1155 IPV6_TCLASS, IPPROTO_IPV6); 1156 1157 if (*mp) 1158 mp = &(*mp)->m_next; 1159 } 1160 1161 /* 1162 * IPV6_HOPOPTS socket option. Recall that we required super-user 1163 * privilege for the option (see ip6_ctloutput), but it might be too 1164 * strict, since there might be some hop-by-hop options which can be 1165 * returned to normal user. 1166 * See also RFC3542 section 8 (or RFC2292 section 6). 1167 */ 1168 if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0) { 1169 /* 1170 * Check if a hop-by-hop options header is contatined in the 1171 * received packet, and if so, store the options as ancillary 1172 * data. Note that a hop-by-hop options header must be 1173 * just after the IPv6 header, which fact is assured through 1174 * the IPv6 input processing. 1175 */ 1176 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1177 if (xip6->ip6_nxt == IPPROTO_HOPOPTS) { 1178 struct ip6_hbh *hbh; 1179 int hbhlen; 1180 struct mbuf *ext; 1181 1182 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr), 1183 xip6->ip6_nxt); 1184 if (ext == NULL) { 1185 IP6_STATINC(IP6_STAT_TOOSHORT); 1186 return; 1187 } 1188 hbh = mtod(ext, struct ip6_hbh *); 1189 hbhlen = (hbh->ip6h_len + 1) << 3; 1190 if (hbhlen != ext->m_len) { 1191 m_freem(ext); 1192 IP6_STATINC(IP6_STAT_TOOSHORT); 1193 return; 1194 } 1195 1196 /* 1197 * XXX: We copy whole the header even if a jumbo 1198 * payload option is included, which option is to 1199 * be removed before returning in the RFC 2292. 1200 * Note: this constraint is removed in RFC3542. 1201 */ 1202 *mp = sbcreatecontrol((void *)hbh, hbhlen, 1203 IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS), 1204 IPPROTO_IPV6); 1205 if (*mp) 1206 mp = &(*mp)->m_next; 1207 m_freem(ext); 1208 } 1209 } 1210 1211 /* IPV6_DSTOPTS and IPV6_RTHDR socket options */ 1212 if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) { 1213 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1214 int nxt = xip6->ip6_nxt, off = sizeof(struct ip6_hdr); 1215 1216 /* 1217 * Search for destination options headers or routing 1218 * header(s) through the header chain, and stores each 1219 * header as ancillary data. 1220 * Note that the order of the headers remains in 1221 * the chain of ancillary data. 1222 */ 1223 for (;;) { /* is explicit loop prevention necessary? */ 1224 struct ip6_ext *ip6e = NULL; 1225 int elen; 1226 struct mbuf *ext = NULL; 1227 1228 /* 1229 * if it is not an extension header, don't try to 1230 * pull it from the chain. 1231 */ 1232 switch (nxt) { 1233 case IPPROTO_DSTOPTS: 1234 case IPPROTO_ROUTING: 1235 case IPPROTO_HOPOPTS: 1236 case IPPROTO_AH: /* is it possible? */ 1237 break; 1238 default: 1239 goto loopend; 1240 } 1241 1242 ext = ip6_pullexthdr(m, off, nxt); 1243 if (ext == NULL) { 1244 IP6_STATINC(IP6_STAT_TOOSHORT); 1245 return; 1246 } 1247 ip6e = mtod(ext, struct ip6_ext *); 1248 if (nxt == IPPROTO_AH) 1249 elen = (ip6e->ip6e_len + 2) << 2; 1250 else 1251 elen = (ip6e->ip6e_len + 1) << 3; 1252 if (elen != ext->m_len) { 1253 m_freem(ext); 1254 IP6_STATINC(IP6_STAT_TOOSHORT); 1255 return; 1256 } 1257 KASSERT(IP6_HDR_ALIGNED_P(ip6e)); 1258 1259 switch (nxt) { 1260 case IPPROTO_DSTOPTS: 1261 if (!(in6p->in6p_flags & IN6P_DSTOPTS)) 1262 break; 1263 1264 *mp = sbcreatecontrol((void *)ip6e, elen, 1265 IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS), 1266 IPPROTO_IPV6); 1267 if (*mp) 1268 mp = &(*mp)->m_next; 1269 break; 1270 1271 case IPPROTO_ROUTING: 1272 if (!(in6p->in6p_flags & IN6P_RTHDR)) 1273 break; 1274 1275 *mp = sbcreatecontrol((void *)ip6e, elen, 1276 IS2292(IPV6_2292RTHDR, IPV6_RTHDR), 1277 IPPROTO_IPV6); 1278 if (*mp) 1279 mp = &(*mp)->m_next; 1280 break; 1281 1282 case IPPROTO_HOPOPTS: 1283 case IPPROTO_AH: /* is it possible? */ 1284 break; 1285 1286 default: 1287 /* 1288 * other cases have been filtered in the above. 1289 * none will visit this case. here we supply 1290 * the code just in case (nxt overwritten or 1291 * other cases). 1292 */ 1293 m_freem(ext); 1294 goto loopend; 1295 1296 } 1297 1298 /* proceed with the next header. */ 1299 off += elen; 1300 nxt = ip6e->ip6e_nxt; 1301 ip6e = NULL; 1302 m_freem(ext); 1303 ext = NULL; 1304 } 1305 loopend: 1306 ; 1307 } 1308 } 1309 #undef IS2292 1310 1311 1312 void 1313 ip6_notify_pmtu(struct in6pcb *in6p, const struct sockaddr_in6 *dst, 1314 uint32_t *mtu) 1315 { 1316 struct socket *so; 1317 struct mbuf *m_mtu; 1318 struct ip6_mtuinfo mtuctl; 1319 1320 so = in6p->in6p_socket; 1321 1322 if (mtu == NULL) 1323 return; 1324 1325 KASSERT(so != NULL); 1326 1327 memset(&mtuctl, 0, sizeof(mtuctl)); /* zero-clear for safety */ 1328 mtuctl.ip6m_mtu = *mtu; 1329 mtuctl.ip6m_addr = *dst; 1330 if (sa6_recoverscope(&mtuctl.ip6m_addr)) 1331 return; 1332 1333 if ((m_mtu = sbcreatecontrol((void *)&mtuctl, sizeof(mtuctl), 1334 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL) 1335 return; 1336 1337 if (sbappendaddr(&so->so_rcv, (const struct sockaddr *)dst, NULL, m_mtu) 1338 == 0) { 1339 m_freem(m_mtu); 1340 /* XXX: should count statistics */ 1341 } else 1342 sorwakeup(so); 1343 1344 return; 1345 } 1346 1347 /* 1348 * pull single extension header from mbuf chain. returns single mbuf that 1349 * contains the result, or NULL on error. 1350 */ 1351 static struct mbuf * 1352 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt) 1353 { 1354 struct ip6_ext ip6e; 1355 size_t elen; 1356 struct mbuf *n; 1357 1358 #ifdef DIAGNOSTIC 1359 switch (nxt) { 1360 case IPPROTO_DSTOPTS: 1361 case IPPROTO_ROUTING: 1362 case IPPROTO_HOPOPTS: 1363 case IPPROTO_AH: /* is it possible? */ 1364 break; 1365 default: 1366 printf("ip6_pullexthdr: invalid nxt=%d\n", nxt); 1367 } 1368 #endif 1369 1370 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1371 if (nxt == IPPROTO_AH) 1372 elen = (ip6e.ip6e_len + 2) << 2; 1373 else 1374 elen = (ip6e.ip6e_len + 1) << 3; 1375 1376 MGET(n, M_DONTWAIT, MT_DATA); 1377 if (n && elen >= MLEN) { 1378 MCLGET(n, M_DONTWAIT); 1379 if ((n->m_flags & M_EXT) == 0) { 1380 m_free(n); 1381 n = NULL; 1382 } 1383 } 1384 if (!n) 1385 return NULL; 1386 1387 n->m_len = 0; 1388 if (elen >= M_TRAILINGSPACE(n)) { 1389 m_free(n); 1390 return NULL; 1391 } 1392 1393 m_copydata(m, off, elen, mtod(n, void *)); 1394 n->m_len = elen; 1395 return n; 1396 } 1397 1398 /* 1399 * Get pointer to the previous header followed by the header 1400 * currently processed. 1401 * XXX: This function supposes that 1402 * M includes all headers, 1403 * the next header field and the header length field of each header 1404 * are valid, and 1405 * the sum of each header length equals to OFF. 1406 * Because of these assumptions, this function must be called very 1407 * carefully. Moreover, it will not be used in the near future when 1408 * we develop `neater' mechanism to process extension headers. 1409 */ 1410 u_int8_t * 1411 ip6_get_prevhdr(struct mbuf *m, int off) 1412 { 1413 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1414 1415 if (off == sizeof(struct ip6_hdr)) 1416 return (&ip6->ip6_nxt); 1417 else { 1418 int len, nxt; 1419 struct ip6_ext *ip6e = NULL; 1420 1421 nxt = ip6->ip6_nxt; 1422 len = sizeof(struct ip6_hdr); 1423 while (len < off) { 1424 ip6e = (struct ip6_ext *)(mtod(m, char *) + len); 1425 1426 switch (nxt) { 1427 case IPPROTO_FRAGMENT: 1428 len += sizeof(struct ip6_frag); 1429 break; 1430 case IPPROTO_AH: 1431 len += (ip6e->ip6e_len + 2) << 2; 1432 break; 1433 default: 1434 len += (ip6e->ip6e_len + 1) << 3; 1435 break; 1436 } 1437 nxt = ip6e->ip6e_nxt; 1438 } 1439 if (ip6e) 1440 return (&ip6e->ip6e_nxt); 1441 else 1442 return NULL; 1443 } 1444 } 1445 1446 /* 1447 * get next header offset. m will be retained. 1448 */ 1449 int 1450 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp) 1451 { 1452 struct ip6_hdr ip6; 1453 struct ip6_ext ip6e; 1454 struct ip6_frag fh; 1455 1456 /* just in case */ 1457 if (m == NULL) 1458 panic("ip6_nexthdr: m == NULL"); 1459 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off) 1460 return -1; 1461 1462 switch (proto) { 1463 case IPPROTO_IPV6: 1464 /* do not chase beyond intermediate IPv6 headers */ 1465 if (off != 0) 1466 return -1; 1467 if (m->m_pkthdr.len < off + sizeof(ip6)) 1468 return -1; 1469 m_copydata(m, off, sizeof(ip6), (void *)&ip6); 1470 if (nxtp) 1471 *nxtp = ip6.ip6_nxt; 1472 off += sizeof(ip6); 1473 return off; 1474 1475 case IPPROTO_FRAGMENT: 1476 /* 1477 * terminate parsing if it is not the first fragment, 1478 * it does not make sense to parse through it. 1479 */ 1480 if (m->m_pkthdr.len < off + sizeof(fh)) 1481 return -1; 1482 m_copydata(m, off, sizeof(fh), (void *)&fh); 1483 if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0) 1484 return -1; 1485 if (nxtp) 1486 *nxtp = fh.ip6f_nxt; 1487 off += sizeof(struct ip6_frag); 1488 return off; 1489 1490 case IPPROTO_AH: 1491 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1492 return -1; 1493 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1494 if (nxtp) 1495 *nxtp = ip6e.ip6e_nxt; 1496 off += (ip6e.ip6e_len + 2) << 2; 1497 if (m->m_pkthdr.len < off) 1498 return -1; 1499 return off; 1500 1501 case IPPROTO_HOPOPTS: 1502 case IPPROTO_ROUTING: 1503 case IPPROTO_DSTOPTS: 1504 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1505 return -1; 1506 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1507 if (nxtp) 1508 *nxtp = ip6e.ip6e_nxt; 1509 off += (ip6e.ip6e_len + 1) << 3; 1510 if (m->m_pkthdr.len < off) 1511 return -1; 1512 return off; 1513 1514 case IPPROTO_NONE: 1515 case IPPROTO_ESP: 1516 case IPPROTO_IPCOMP: 1517 /* give up */ 1518 return -1; 1519 1520 default: 1521 return -1; 1522 } 1523 } 1524 1525 /* 1526 * get offset for the last header in the chain. m will be kept untainted. 1527 */ 1528 int 1529 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp) 1530 { 1531 int newoff; 1532 int nxt; 1533 1534 if (!nxtp) { 1535 nxt = -1; 1536 nxtp = &nxt; 1537 } 1538 for (;;) { 1539 newoff = ip6_nexthdr(m, off, proto, nxtp); 1540 if (newoff < 0) 1541 return off; 1542 else if (newoff < off) 1543 return -1; /* invalid */ 1544 else if (newoff == off) 1545 return newoff; 1546 1547 off = newoff; 1548 proto = *nxtp; 1549 } 1550 } 1551 1552 struct m_tag * 1553 ip6_addaux(struct mbuf *m) 1554 { 1555 struct m_tag *mtag; 1556 1557 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1558 if (!mtag) { 1559 mtag = m_tag_get(PACKET_TAG_INET6, sizeof(struct ip6aux), 1560 M_NOWAIT); 1561 if (mtag) { 1562 m_tag_prepend(m, mtag); 1563 memset(mtag + 1, 0, sizeof(struct ip6aux)); 1564 } 1565 } 1566 return mtag; 1567 } 1568 1569 struct m_tag * 1570 ip6_findaux(struct mbuf *m) 1571 { 1572 struct m_tag *mtag; 1573 1574 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1575 return mtag; 1576 } 1577 1578 void 1579 ip6_delaux(struct mbuf *m) 1580 { 1581 struct m_tag *mtag; 1582 1583 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1584 if (mtag) 1585 m_tag_delete(m, mtag); 1586 } 1587 1588 /* 1589 * System control for IP6 1590 */ 1591 1592 const u_char inet6ctlerrmap[PRC_NCMDS] = { 1593 0, 0, 0, 0, 1594 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 1595 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 1596 EMSGSIZE, EHOSTUNREACH, 0, 0, 1597 0, 0, 0, 0, 1598 ENOPROTOOPT 1599 }; 1600 1601 extern int sysctl_net_inet6_addrctlpolicy(SYSCTLFN_ARGS); 1602 1603 static int 1604 sysctl_net_inet6_ip6_stats(SYSCTLFN_ARGS) 1605 { 1606 1607 return (NETSTAT_SYSCTL(ip6stat_percpu, IP6_NSTATS)); 1608 } 1609 1610 static void 1611 sysctl_net_inet6_ip6_setup(struct sysctllog **clog) 1612 { 1613 #ifdef RFC2292 1614 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y)) 1615 #else 1616 #define IS2292(x, y) (y) 1617 #endif 1618 1619 sysctl_createv(clog, 0, NULL, NULL, 1620 CTLFLAG_PERMANENT, 1621 CTLTYPE_NODE, "inet6", 1622 SYSCTL_DESCR("PF_INET6 related settings"), 1623 NULL, 0, NULL, 0, 1624 CTL_NET, PF_INET6, CTL_EOL); 1625 sysctl_createv(clog, 0, NULL, NULL, 1626 CTLFLAG_PERMANENT, 1627 CTLTYPE_NODE, "ip6", 1628 SYSCTL_DESCR("IPv6 related settings"), 1629 NULL, 0, NULL, 0, 1630 CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_EOL); 1631 1632 sysctl_createv(clog, 0, NULL, NULL, 1633 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1634 CTLTYPE_INT, "forwarding", 1635 SYSCTL_DESCR("Enable forwarding of INET6 datagrams"), 1636 NULL, 0, &ip6_forwarding, 0, 1637 CTL_NET, PF_INET6, IPPROTO_IPV6, 1638 IPV6CTL_FORWARDING, CTL_EOL); 1639 sysctl_createv(clog, 0, NULL, NULL, 1640 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1641 CTLTYPE_INT, "redirect", 1642 SYSCTL_DESCR("Enable sending of ICMPv6 redirect messages"), 1643 NULL, 0, &ip6_sendredirects, 0, 1644 CTL_NET, PF_INET6, IPPROTO_IPV6, 1645 IPV6CTL_SENDREDIRECTS, CTL_EOL); 1646 sysctl_createv(clog, 0, NULL, NULL, 1647 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1648 CTLTYPE_INT, "hlim", 1649 SYSCTL_DESCR("Hop limit for an INET6 datagram"), 1650 NULL, 0, &ip6_defhlim, 0, 1651 CTL_NET, PF_INET6, IPPROTO_IPV6, 1652 IPV6CTL_DEFHLIM, CTL_EOL); 1653 #ifdef notyet 1654 sysctl_createv(clog, 0, NULL, NULL, 1655 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1656 CTLTYPE_INT, "mtu", NULL, 1657 NULL, 0, &, 0, 1658 CTL_NET, PF_INET6, IPPROTO_IPV6, 1659 IPV6CTL_DEFMTU, CTL_EOL); 1660 #endif 1661 #ifdef __no_idea__ 1662 sysctl_createv(clog, 0, NULL, NULL, 1663 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1664 CTLTYPE_INT, "forwsrcrt", NULL, 1665 NULL, 0, &?, 0, 1666 CTL_NET, PF_INET6, IPPROTO_IPV6, 1667 IPV6CTL_FORWSRCRT, CTL_EOL); 1668 sysctl_createv(clog, 0, NULL, NULL, 1669 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1670 CTLTYPE_STRUCT, "mrtstats", NULL, 1671 NULL, 0, &?, sizeof(?), 1672 CTL_NET, PF_INET6, IPPROTO_IPV6, 1673 IPV6CTL_MRTSTATS, CTL_EOL); 1674 sysctl_createv(clog, 0, NULL, NULL, 1675 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1676 CTLTYPE_?, "mrtproto", NULL, 1677 NULL, 0, &?, sizeof(?), 1678 CTL_NET, PF_INET6, IPPROTO_IPV6, 1679 IPV6CTL_MRTPROTO, CTL_EOL); 1680 #endif 1681 sysctl_createv(clog, 0, NULL, NULL, 1682 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1683 CTLTYPE_INT, "maxfragpackets", 1684 SYSCTL_DESCR("Maximum number of fragments to buffer " 1685 "for reassembly"), 1686 NULL, 0, &ip6_maxfragpackets, 0, 1687 CTL_NET, PF_INET6, IPPROTO_IPV6, 1688 IPV6CTL_MAXFRAGPACKETS, CTL_EOL); 1689 #ifdef __no_idea__ 1690 sysctl_createv(clog, 0, NULL, NULL, 1691 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1692 CTLTYPE_INT, "sourcecheck", NULL, 1693 NULL, 0, &?, 0, 1694 CTL_NET, PF_INET6, IPPROTO_IPV6, 1695 IPV6CTL_SOURCECHECK, CTL_EOL); 1696 sysctl_createv(clog, 0, NULL, NULL, 1697 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1698 CTLTYPE_INT, "sourcecheck_logint", NULL, 1699 NULL, 0, &?, 0, 1700 CTL_NET, PF_INET6, IPPROTO_IPV6, 1701 IPV6CTL_SOURCECHECK_LOGINT, CTL_EOL); 1702 #endif 1703 sysctl_createv(clog, 0, NULL, NULL, 1704 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1705 CTLTYPE_INT, "accept_rtadv", 1706 SYSCTL_DESCR("Accept router advertisements"), 1707 NULL, 0, &ip6_accept_rtadv, 0, 1708 CTL_NET, PF_INET6, IPPROTO_IPV6, 1709 IPV6CTL_ACCEPT_RTADV, CTL_EOL); 1710 sysctl_createv(clog, 0, NULL, NULL, 1711 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1712 CTLTYPE_INT, "rtadv_maxroutes", 1713 SYSCTL_DESCR("Maximum number of routes accepted via router advertisements"), 1714 NULL, 0, &ip6_rtadv_maxroutes, 0, 1715 CTL_NET, PF_INET6, IPPROTO_IPV6, 1716 IPV6CTL_RTADV_MAXROUTES, CTL_EOL); 1717 sysctl_createv(clog, 0, NULL, NULL, 1718 CTLFLAG_PERMANENT, 1719 CTLTYPE_INT, "rtadv_numroutes", 1720 SYSCTL_DESCR("Current number of routes accepted via router advertisements"), 1721 NULL, 0, &nd6_numroutes, 0, 1722 CTL_NET, PF_INET6, IPPROTO_IPV6, 1723 IPV6CTL_RTADV_NUMROUTES, CTL_EOL); 1724 sysctl_createv(clog, 0, NULL, NULL, 1725 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1726 CTLTYPE_INT, "keepfaith", 1727 SYSCTL_DESCR("Activate faith interface"), 1728 NULL, 0, &ip6_keepfaith, 0, 1729 CTL_NET, PF_INET6, IPPROTO_IPV6, 1730 IPV6CTL_KEEPFAITH, CTL_EOL); 1731 sysctl_createv(clog, 0, NULL, NULL, 1732 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1733 CTLTYPE_INT, "log_interval", 1734 SYSCTL_DESCR("Minumum interval between logging " 1735 "unroutable packets"), 1736 NULL, 0, &ip6_log_interval, 0, 1737 CTL_NET, PF_INET6, IPPROTO_IPV6, 1738 IPV6CTL_LOG_INTERVAL, CTL_EOL); 1739 sysctl_createv(clog, 0, NULL, NULL, 1740 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1741 CTLTYPE_INT, "hdrnestlimit", 1742 SYSCTL_DESCR("Maximum number of nested IPv6 headers"), 1743 NULL, 0, &ip6_hdrnestlimit, 0, 1744 CTL_NET, PF_INET6, IPPROTO_IPV6, 1745 IPV6CTL_HDRNESTLIMIT, CTL_EOL); 1746 sysctl_createv(clog, 0, NULL, NULL, 1747 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1748 CTLTYPE_INT, "dad_count", 1749 SYSCTL_DESCR("Number of Duplicate Address Detection " 1750 "probes to send"), 1751 NULL, 0, &ip6_dad_count, 0, 1752 CTL_NET, PF_INET6, IPPROTO_IPV6, 1753 IPV6CTL_DAD_COUNT, CTL_EOL); 1754 sysctl_createv(clog, 0, NULL, NULL, 1755 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1756 CTLTYPE_INT, "auto_flowlabel", 1757 SYSCTL_DESCR("Assign random IPv6 flow labels"), 1758 NULL, 0, &ip6_auto_flowlabel, 0, 1759 CTL_NET, PF_INET6, IPPROTO_IPV6, 1760 IPV6CTL_AUTO_FLOWLABEL, CTL_EOL); 1761 sysctl_createv(clog, 0, NULL, NULL, 1762 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1763 CTLTYPE_INT, "defmcasthlim", 1764 SYSCTL_DESCR("Default multicast hop limit"), 1765 NULL, 0, &ip6_defmcasthlim, 0, 1766 CTL_NET, PF_INET6, IPPROTO_IPV6, 1767 IPV6CTL_DEFMCASTHLIM, CTL_EOL); 1768 sysctl_createv(clog, 0, NULL, NULL, 1769 CTLFLAG_PERMANENT, 1770 CTLTYPE_STRING, "kame_version", 1771 SYSCTL_DESCR("KAME Version"), 1772 NULL, 0, __UNCONST(__KAME_VERSION), 0, 1773 CTL_NET, PF_INET6, IPPROTO_IPV6, 1774 IPV6CTL_KAME_VERSION, CTL_EOL); 1775 sysctl_createv(clog, 0, NULL, NULL, 1776 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1777 CTLTYPE_INT, "use_deprecated", 1778 SYSCTL_DESCR("Allow use of deprecated addresses as " 1779 "source addresses"), 1780 NULL, 0, &ip6_use_deprecated, 0, 1781 CTL_NET, PF_INET6, IPPROTO_IPV6, 1782 IPV6CTL_USE_DEPRECATED, CTL_EOL); 1783 sysctl_createv(clog, 0, NULL, NULL, 1784 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1785 CTLTYPE_INT, "rr_prune", NULL, 1786 NULL, 0, &ip6_rr_prune, 0, 1787 CTL_NET, PF_INET6, IPPROTO_IPV6, 1788 IPV6CTL_RR_PRUNE, CTL_EOL); 1789 sysctl_createv(clog, 0, NULL, NULL, 1790 CTLFLAG_PERMANENT 1791 #ifndef INET6_BINDV6ONLY 1792 |CTLFLAG_READWRITE, 1793 #endif 1794 CTLTYPE_INT, "v6only", 1795 SYSCTL_DESCR("Disallow PF_INET6 sockets from connecting " 1796 "to PF_INET sockets"), 1797 NULL, 0, &ip6_v6only, 0, 1798 CTL_NET, PF_INET6, IPPROTO_IPV6, 1799 IPV6CTL_V6ONLY, CTL_EOL); 1800 sysctl_createv(clog, 0, NULL, NULL, 1801 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1802 CTLTYPE_INT, "anonportmin", 1803 SYSCTL_DESCR("Lowest ephemeral port number to assign"), 1804 sysctl_net_inet_ip_ports, 0, &ip6_anonportmin, 0, 1805 CTL_NET, PF_INET6, IPPROTO_IPV6, 1806 IPV6CTL_ANONPORTMIN, CTL_EOL); 1807 sysctl_createv(clog, 0, NULL, NULL, 1808 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1809 CTLTYPE_INT, "anonportmax", 1810 SYSCTL_DESCR("Highest ephemeral port number to assign"), 1811 sysctl_net_inet_ip_ports, 0, &ip6_anonportmax, 0, 1812 CTL_NET, PF_INET6, IPPROTO_IPV6, 1813 IPV6CTL_ANONPORTMAX, CTL_EOL); 1814 #ifndef IPNOPRIVPORTS 1815 sysctl_createv(clog, 0, NULL, NULL, 1816 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1817 CTLTYPE_INT, "lowportmin", 1818 SYSCTL_DESCR("Lowest privileged ephemeral port number " 1819 "to assign"), 1820 sysctl_net_inet_ip_ports, 0, &ip6_lowportmin, 0, 1821 CTL_NET, PF_INET6, IPPROTO_IPV6, 1822 IPV6CTL_LOWPORTMIN, CTL_EOL); 1823 sysctl_createv(clog, 0, NULL, NULL, 1824 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1825 CTLTYPE_INT, "lowportmax", 1826 SYSCTL_DESCR("Highest privileged ephemeral port number " 1827 "to assign"), 1828 sysctl_net_inet_ip_ports, 0, &ip6_lowportmax, 0, 1829 CTL_NET, PF_INET6, IPPROTO_IPV6, 1830 IPV6CTL_LOWPORTMAX, CTL_EOL); 1831 #endif /* IPNOPRIVPORTS */ 1832 sysctl_createv(clog, 0, NULL, NULL, 1833 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1834 CTLTYPE_INT, "auto_linklocal", 1835 SYSCTL_DESCR("Default value of per-interface flag for " 1836 "adding an IPv6 link-local address to " 1837 "interfaces when attached"), 1838 NULL, 0, &ip6_auto_linklocal, 0, 1839 CTL_NET, PF_INET6, IPPROTO_IPV6, 1840 IPV6CTL_AUTO_LINKLOCAL, CTL_EOL); 1841 sysctl_createv(clog, 0, NULL, NULL, 1842 CTLFLAG_PERMANENT|CTLFLAG_READONLY, 1843 CTLTYPE_STRUCT, "addctlpolicy", 1844 SYSCTL_DESCR("Return the current address control" 1845 " policy"), 1846 sysctl_net_inet6_addrctlpolicy, 0, NULL, 0, 1847 CTL_NET, PF_INET6, IPPROTO_IPV6, 1848 IPV6CTL_ADDRCTLPOLICY, CTL_EOL); 1849 sysctl_createv(clog, 0, NULL, NULL, 1850 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1851 CTLTYPE_INT, "use_tempaddr", 1852 SYSCTL_DESCR("Use temporary address"), 1853 NULL, 0, &ip6_use_tempaddr, 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, "prefer_tempaddr", 1859 SYSCTL_DESCR("Prefer temporary address as source " 1860 "address"), 1861 NULL, 0, &ip6_prefer_tempaddr, 0, 1862 CTL_NET, PF_INET6, IPPROTO_IPV6, 1863 CTL_CREATE, CTL_EOL); 1864 sysctl_createv(clog, 0, NULL, NULL, 1865 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1866 CTLTYPE_INT, "temppltime", 1867 SYSCTL_DESCR("preferred lifetime of a temporary address"), 1868 NULL, 0, &ip6_temp_preferred_lifetime, 0, 1869 CTL_NET, PF_INET6, IPPROTO_IPV6, 1870 CTL_CREATE, CTL_EOL); 1871 sysctl_createv(clog, 0, NULL, NULL, 1872 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1873 CTLTYPE_INT, "tempvltime", 1874 SYSCTL_DESCR("valid lifetime of a temporary address"), 1875 NULL, 0, &ip6_temp_valid_lifetime, 0, 1876 CTL_NET, PF_INET6, IPPROTO_IPV6, 1877 CTL_CREATE, CTL_EOL); 1878 sysctl_createv(clog, 0, NULL, NULL, 1879 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1880 CTLTYPE_INT, "maxfrags", 1881 SYSCTL_DESCR("Maximum fragments in reassembly queue"), 1882 NULL, 0, &ip6_maxfrags, 0, 1883 CTL_NET, PF_INET6, IPPROTO_IPV6, 1884 IPV6CTL_MAXFRAGS, CTL_EOL); 1885 sysctl_createv(clog, 0, NULL, NULL, 1886 CTLFLAG_PERMANENT, 1887 CTLTYPE_STRUCT, "stats", 1888 SYSCTL_DESCR("IPv6 statistics"), 1889 sysctl_net_inet6_ip6_stats, 0, NULL, 0, 1890 CTL_NET, PF_INET6, IPPROTO_IPV6, 1891 IPV6CTL_STATS, CTL_EOL); 1892 sysctl_createv(clog, 0, NULL, NULL, 1893 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1894 CTLTYPE_INT, "use_defaultzone", 1895 SYSCTL_DESCR("Whether to use the default scope zones"), 1896 NULL, 0, &ip6_use_defzone, 0, 1897 CTL_NET, PF_INET6, IPPROTO_IPV6, 1898 IPV6CTL_USE_DEFAULTZONE, CTL_EOL); 1899 sysctl_createv(clog, 0, NULL, NULL, 1900 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1901 CTLTYPE_INT, "mcast_pmtu", 1902 SYSCTL_DESCR("Enable pMTU discovery for multicast packet"), 1903 NULL, 0, &ip6_mcast_pmtu, 0, 1904 CTL_NET, PF_INET6, IPPROTO_IPV6, 1905 CTL_CREATE, CTL_EOL); 1906 /* anonportalgo RFC6056 subtree */ 1907 const struct sysctlnode *portalgo_node; 1908 sysctl_createv(clog, 0, NULL, &portalgo_node, 1909 CTLFLAG_PERMANENT, 1910 CTLTYPE_NODE, "anonportalgo", 1911 SYSCTL_DESCR("Anonymous port algorithm selection (RFC 6056)"), 1912 NULL, 0, NULL, 0, 1913 CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_CREATE, CTL_EOL); 1914 sysctl_createv(clog, 0, &portalgo_node, NULL, 1915 CTLFLAG_PERMANENT, 1916 CTLTYPE_STRING, "available", 1917 SYSCTL_DESCR("available algorithms"), 1918 sysctl_portalgo_available, 0, NULL, PORTALGO_MAXLEN, 1919 CTL_CREATE, CTL_EOL); 1920 sysctl_createv(clog, 0, &portalgo_node, NULL, 1921 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1922 CTLTYPE_STRING, "selected", 1923 SYSCTL_DESCR("selected algorithm"), 1924 sysctl_portalgo_selected6, 0, NULL, PORTALGO_MAXLEN, 1925 CTL_CREATE, CTL_EOL); 1926 sysctl_createv(clog, 0, &portalgo_node, NULL, 1927 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1928 CTLTYPE_STRUCT, "reserve", 1929 SYSCTL_DESCR("bitmap of reserved ports"), 1930 sysctl_portalgo_reserve6, 0, NULL, 0, 1931 CTL_CREATE, CTL_EOL); 1932 sysctl_createv(clog, 0, NULL, NULL, 1933 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1934 CTLTYPE_INT, "neighborgcthresh", 1935 SYSCTL_DESCR("Maximum number of entries in neighbor" 1936 " cache"), 1937 NULL, 1, &ip6_neighborgcthresh, 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, "maxifprefixes", 1943 SYSCTL_DESCR("Maximum number of prefixes created by" 1944 " route advertisement per interface"), 1945 NULL, 1, &ip6_maxifprefixes, 0, 1946 CTL_NET, PF_INET6, IPPROTO_IPV6, 1947 CTL_CREATE, CTL_EOL); 1948 sysctl_createv(clog, 0, NULL, NULL, 1949 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1950 CTLTYPE_INT, "maxifdefrouters", 1951 SYSCTL_DESCR("Maximum number of default routers created" 1952 " by route advertisement per interface"), 1953 NULL, 1, &ip6_maxifdefrouters, 0, 1954 CTL_NET, PF_INET6, IPPROTO_IPV6, 1955 CTL_CREATE, CTL_EOL); 1956 sysctl_createv(clog, 0, NULL, NULL, 1957 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1958 CTLTYPE_INT, "maxdynroutes", 1959 SYSCTL_DESCR("Maximum number of routes created via" 1960 " redirect"), 1961 NULL, 1, &ip6_maxdynroutes, 0, 1962 CTL_NET, PF_INET6, IPPROTO_IPV6, 1963 CTL_CREATE, CTL_EOL); 1964 } 1965 1966 void 1967 ip6_statinc(u_int stat) 1968 { 1969 1970 KASSERT(stat < IP6_NSTATS); 1971 IP6_STATINC(stat); 1972 } 1973