ip6_input.c revision 1.171
1 /* $NetBSD: ip6_input.c,v 1.171 2016/12/08 05:16:34 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 1.171 2016/12/08 05:16:34 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 struct rtentry *rt = NULL; 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 ro = percpu_getref(ip6_forward_rt_percpu); 458 /* 459 * Multicast check 460 */ 461 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 462 struct in6_multi *in6m = 0; 463 464 in6_ifstat_inc(rcvif, ifs6_in_mcast); 465 /* 466 * See if we belong to the destination multicast group on the 467 * arrival interface. 468 */ 469 IN6_LOOKUP_MULTI(ip6->ip6_dst, rcvif, in6m); 470 if (in6m) 471 ours = 1; 472 else if (!ip6_mrouter) { 473 uint64_t *ip6s = IP6_STAT_GETREF(); 474 ip6s[IP6_STAT_NOTMEMBER]++; 475 ip6s[IP6_STAT_CANTFORWARD]++; 476 IP6_STAT_PUTREF(); 477 in6_ifstat_inc(rcvif, ifs6_in_discard); 478 goto bad_unref; 479 } 480 deliverifp = rcvif; 481 goto hbhcheck; 482 } 483 484 sockaddr_in6_init(&u.dst6, &ip6->ip6_dst, 0, 0, 0); 485 486 /* 487 * Unicast check 488 */ 489 rt = rtcache_lookup2(ro, &u.dst, 1, &hit); 490 if (hit) 491 IP6_STATINC(IP6_STAT_FORWARD_CACHEHIT); 492 else 493 IP6_STATINC(IP6_STAT_FORWARD_CACHEMISS); 494 495 #define rt6_getkey(__rt) satocsin6(rt_getkey(__rt)) 496 497 /* 498 * Accept the packet if the forwarding interface to the destination 499 * according to the routing table is the loopback interface, 500 * unless the associated route has a gateway. 501 * Note that this approach causes to accept a packet if there is a 502 * route to the loopback interface for the destination of the packet. 503 * But we think it's even useful in some situations, e.g. when using 504 * a special daemon which wants to intercept the packet. 505 */ 506 if (rt != NULL && 507 (rt->rt_flags & (RTF_HOST|RTF_GATEWAY)) == RTF_HOST && 508 #if 0 509 /* 510 * The check below is redundant since the comparison of 511 * the destination and the key of the rtentry has 512 * already done through looking up the routing table. 513 */ 514 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &rt6_getkey(rt)->sin6_addr) && 515 #endif 516 rt->rt_ifp->if_type == IFT_LOOP) { 517 struct in6_ifaddr *ia6 = (struct in6_ifaddr *)rt->rt_ifa; 518 if (ia6->ia6_flags & IN6_IFF_ANYCAST) 519 m->m_flags |= M_ANYCAST6; 520 /* 521 * packets to a tentative, duplicated, or somehow invalid 522 * address must not be accepted. 523 */ 524 if (!(ia6->ia6_flags & (IN6_IFF_NOTREADY | IN6_IFF_DETACHED))) { 525 /* this address is ready */ 526 ours = 1; 527 deliverifp = ia6->ia_ifp; /* correct? */ 528 goto hbhcheck; 529 } else { 530 /* address is not ready, so discard the packet. */ 531 nd6log(LOG_INFO, "packet to an unready address %s->%s\n", 532 ip6_sprintf(&ip6->ip6_src), 533 ip6_sprintf(&ip6->ip6_dst)); 534 535 goto bad_unref; 536 } 537 } 538 539 /* 540 * FAITH (Firewall Aided Internet Translator) 541 */ 542 #if defined(NFAITH) && 0 < NFAITH 543 if (ip6_keepfaith) { 544 if (rt != NULL && rt->rt_ifp != NULL && 545 rt->rt_ifp->if_type == IFT_FAITH) { 546 /* XXX do we need more sanity checks? */ 547 ours = 1; 548 deliverifp = rt->rt_ifp; /* faith */ 549 goto hbhcheck; 550 } 551 } 552 #endif 553 554 #if 0 555 { 556 /* 557 * Last resort: check in6_ifaddr for incoming interface. 558 * The code is here until I update the "goto ours hack" code above 559 * working right. 560 */ 561 struct ifaddr *ifa; 562 IFADDR_READER_FOREACH(ifa, rcvif) { 563 if (ifa->ifa_addr->sa_family != AF_INET6) 564 continue; 565 if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) { 566 ours = 1; 567 deliverifp = ifa->ifa_ifp; 568 goto hbhcheck; 569 } 570 } 571 } 572 #endif 573 574 /* 575 * Now there is no reason to process the packet if it's not our own 576 * and we're not a router. 577 */ 578 if (!ip6_forwarding) { 579 IP6_STATINC(IP6_STAT_CANTFORWARD); 580 in6_ifstat_inc(rcvif, ifs6_in_discard); 581 goto bad_unref; 582 } 583 584 hbhcheck: 585 /* 586 * record address information into m_tag, if we don't have one yet. 587 * note that we are unable to record it, if the address is not listed 588 * as our interface address (e.g. multicast addresses, addresses 589 * within FAITH prefixes and such). 590 */ 591 if (deliverifp && ip6_getdstifaddr(m) == NULL) { 592 struct in6_ifaddr *ia6; 593 int s = pserialize_read_enter(); 594 595 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 596 /* Depends on ip6_setdstifaddr never sleep */ 597 if (ia6 != NULL && ip6_setdstifaddr(m, ia6) == NULL) { 598 /* 599 * XXX maybe we should drop the packet here, 600 * as we could not provide enough information 601 * to the upper layers. 602 */ 603 } 604 pserialize_read_exit(s); 605 } 606 607 /* 608 * Process Hop-by-Hop options header if it's contained. 609 * m may be modified in ip6_hopopts_input(). 610 * If a JumboPayload option is included, plen will also be modified. 611 */ 612 plen = (u_int32_t)ntohs(ip6->ip6_plen); 613 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 614 struct ip6_hbh *hbh; 615 616 if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) { 617 #if 0 /*touches NULL pointer*/ 618 in6_ifstat_inc(rcvif, ifs6_in_discard); 619 #endif 620 rtcache_unref(rt, ro); 621 percpu_putref(ip6_forward_rt_percpu); 622 return; /* m have already been freed */ 623 } 624 625 /* adjust pointer */ 626 ip6 = mtod(m, struct ip6_hdr *); 627 628 /* 629 * if the payload length field is 0 and the next header field 630 * indicates Hop-by-Hop Options header, then a Jumbo Payload 631 * option MUST be included. 632 */ 633 if (ip6->ip6_plen == 0 && plen == 0) { 634 /* 635 * Note that if a valid jumbo payload option is 636 * contained, ip6_hopopts_input() must set a valid 637 * (non-zero) payload length to the variable plen. 638 */ 639 IP6_STATINC(IP6_STAT_BADOPTIONS); 640 in6_ifstat_inc(rcvif, ifs6_in_discard); 641 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 642 icmp6_error(m, ICMP6_PARAM_PROB, 643 ICMP6_PARAMPROB_HEADER, 644 (char *)&ip6->ip6_plen - (char *)ip6); 645 rtcache_unref(rt, ro); 646 percpu_putref(ip6_forward_rt_percpu); 647 return; 648 } 649 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 650 sizeof(struct ip6_hbh)); 651 if (hbh == NULL) { 652 IP6_STATINC(IP6_STAT_TOOSHORT); 653 rtcache_unref(rt, ro); 654 percpu_putref(ip6_forward_rt_percpu); 655 return; 656 } 657 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 658 nxt = hbh->ip6h_nxt; 659 660 /* 661 * accept the packet if a router alert option is included 662 * and we act as an IPv6 router. 663 */ 664 if (rtalert != ~0 && ip6_forwarding) 665 ours = 1; 666 } else 667 nxt = ip6->ip6_nxt; 668 669 /* 670 * Check that the amount of data in the buffers 671 * is as at least much as the IPv6 header would have us expect. 672 * Trim mbufs if longer than we expect. 673 * Drop packet if shorter than we expect. 674 */ 675 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 676 IP6_STATINC(IP6_STAT_TOOSHORT); 677 in6_ifstat_inc(rcvif, ifs6_in_truncated); 678 goto bad_unref; 679 } 680 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 681 if (m->m_len == m->m_pkthdr.len) { 682 m->m_len = sizeof(struct ip6_hdr) + plen; 683 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 684 } else 685 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 686 } 687 688 /* 689 * Forward if desirable. 690 */ 691 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 692 /* 693 * If we are acting as a multicast router, all 694 * incoming multicast packets are passed to the 695 * kernel-level multicast forwarding function. 696 * The packet is returned (relatively) intact; if 697 * ip6_mforward() returns a non-zero value, the packet 698 * must be discarded, else it may be accepted below. 699 */ 700 if (ip6_mrouter != NULL) { 701 int error; 702 703 SOFTNET_LOCK(); 704 error = ip6_mforward(ip6, rcvif, m); 705 SOFTNET_UNLOCK(); 706 707 if (error != 0) { 708 rtcache_unref(rt, ro); 709 percpu_putref(ip6_forward_rt_percpu); 710 IP6_STATINC(IP6_STAT_CANTFORWARD); 711 goto bad; 712 } 713 } 714 if (!ours) 715 goto bad_unref; 716 } else if (!ours) { 717 rtcache_unref(rt, ro); 718 percpu_putref(ip6_forward_rt_percpu); 719 ip6_forward(m, srcrt); 720 return; 721 } 722 723 ip6 = mtod(m, struct ip6_hdr *); 724 725 /* 726 * Malicious party may be able to use IPv4 mapped addr to confuse 727 * tcp/udp stack and bypass security checks (act as if it was from 728 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious. 729 * 730 * For SIIT end node behavior, you may want to disable the check. 731 * However, you will become vulnerable to attacks using IPv4 mapped 732 * source. 733 */ 734 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 735 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 736 IP6_STATINC(IP6_STAT_BADSCOPE); 737 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 738 goto bad_unref; 739 } 740 741 /* 742 * Tell launch routine the next header 743 */ 744 #ifdef IFA_STATS 745 if (deliverifp != NULL) { 746 struct in6_ifaddr *ia6; 747 int s = pserialize_read_enter(); 748 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 749 if (ia6) 750 ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len; 751 pserialize_read_exit(s); 752 } 753 #endif 754 IP6_STATINC(IP6_STAT_DELIVERED); 755 in6_ifstat_inc(deliverifp, ifs6_in_deliver); 756 nest = 0; 757 758 if (rt != NULL) { 759 rtcache_unref(rt, ro); 760 rt = NULL; 761 } 762 percpu_putref(ip6_forward_rt_percpu); 763 764 rh_present = 0; 765 while (nxt != IPPROTO_DONE) { 766 if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) { 767 IP6_STATINC(IP6_STAT_TOOMANYHDR); 768 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 769 goto bad; 770 } 771 772 /* 773 * protection against faulty packet - there should be 774 * more sanity checks in header chain processing. 775 */ 776 if (m->m_pkthdr.len < off) { 777 IP6_STATINC(IP6_STAT_TOOSHORT); 778 in6_ifstat_inc(rcvif, ifs6_in_truncated); 779 goto bad; 780 } 781 782 if (nxt == IPPROTO_ROUTING) { 783 if (rh_present++) { 784 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 785 IP6_STATINC(IP6_STAT_BADOPTIONS); 786 goto bad; 787 } 788 } 789 790 #ifdef IPSEC 791 if (ipsec_used) { 792 /* 793 * enforce IPsec policy checking if we are seeing last 794 * header. note that we do not visit this with 795 * protocols with pcb layer code - like udp/tcp/raw ip. 796 */ 797 if ((inet6sw[ip_protox[nxt]].pr_flags 798 & PR_LASTHDR) != 0) { 799 int error; 800 801 SOFTNET_LOCK(); 802 error = ipsec6_input(m); 803 SOFTNET_UNLOCK(); 804 if (error) 805 goto bad; 806 } 807 } 808 #endif /* IPSEC */ 809 810 SOFTNET_LOCK(); 811 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt); 812 SOFTNET_UNLOCK(); 813 } 814 return; 815 816 bad_unref: 817 rtcache_unref(rt, ro); 818 percpu_putref(ip6_forward_rt_percpu); 819 bad: 820 m_freem(m); 821 return; 822 } 823 824 /* 825 * set/grab in6_ifaddr correspond to IPv6 destination address. 826 */ 827 static struct m_tag * 828 ip6_setdstifaddr(struct mbuf *m, const struct in6_ifaddr *ia) 829 { 830 struct m_tag *mtag; 831 struct ip6aux *ip6a; 832 833 mtag = ip6_addaux(m); 834 if (mtag == NULL) 835 return NULL; 836 837 ip6a = (struct ip6aux *)(mtag + 1); 838 if (in6_setscope(&ip6a->ip6a_src, ia->ia_ifp, &ip6a->ip6a_scope_id)) { 839 IP6_STATINC(IP6_STAT_BADSCOPE); 840 return NULL; 841 } 842 843 ip6a->ip6a_src = ia->ia_addr.sin6_addr; 844 ip6a->ip6a_flags = ia->ia6_flags; 845 return mtag; 846 } 847 848 const struct ip6aux * 849 ip6_getdstifaddr(struct mbuf *m) 850 { 851 struct m_tag *mtag; 852 853 mtag = ip6_findaux(m); 854 if (mtag != NULL) 855 return (struct ip6aux *)(mtag + 1); 856 else 857 return NULL; 858 } 859 860 /* 861 * Hop-by-Hop options header processing. If a valid jumbo payload option is 862 * included, the real payload length will be stored in plenp. 863 * 864 * rtalertp - XXX: should be stored more smart way 865 */ 866 int 867 ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp, 868 struct mbuf **mp, int *offp) 869 { 870 struct mbuf *m = *mp; 871 int off = *offp, hbhlen; 872 struct ip6_hbh *hbh; 873 874 /* validation of the length of the header */ 875 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, 876 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh)); 877 if (hbh == NULL) { 878 IP6_STATINC(IP6_STAT_TOOSHORT); 879 return -1; 880 } 881 hbhlen = (hbh->ip6h_len + 1) << 3; 882 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 883 hbhlen); 884 if (hbh == NULL) { 885 IP6_STATINC(IP6_STAT_TOOSHORT); 886 return -1; 887 } 888 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 889 off += hbhlen; 890 hbhlen -= sizeof(struct ip6_hbh); 891 892 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 893 hbhlen, rtalertp, plenp) < 0) 894 return (-1); 895 896 *offp = off; 897 *mp = m; 898 return (0); 899 } 900 901 /* 902 * Search header for all Hop-by-hop options and process each option. 903 * This function is separate from ip6_hopopts_input() in order to 904 * handle a case where the sending node itself process its hop-by-hop 905 * options header. In such a case, the function is called from ip6_output(). 906 * 907 * The function assumes that hbh header is located right after the IPv6 header 908 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to 909 * opthead + hbhlen is located in continuous memory region. 910 */ 911 static int 912 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen, 913 u_int32_t *rtalertp, u_int32_t *plenp) 914 { 915 struct ip6_hdr *ip6; 916 int optlen = 0; 917 u_int8_t *opt = opthead; 918 u_int16_t rtalert_val; 919 u_int32_t jumboplen; 920 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh); 921 922 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 923 switch (*opt) { 924 case IP6OPT_PAD1: 925 optlen = 1; 926 break; 927 case IP6OPT_PADN: 928 if (hbhlen < IP6OPT_MINLEN) { 929 IP6_STATINC(IP6_STAT_TOOSMALL); 930 goto bad; 931 } 932 optlen = *(opt + 1) + 2; 933 break; 934 case IP6OPT_RTALERT: 935 /* XXX may need check for alignment */ 936 if (hbhlen < IP6OPT_RTALERT_LEN) { 937 IP6_STATINC(IP6_STAT_TOOSMALL); 938 goto bad; 939 } 940 if (*(opt + 1) != IP6OPT_RTALERT_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_RTALERT_LEN; 948 memcpy((void *)&rtalert_val, (void *)(opt + 2), 2); 949 *rtalertp = ntohs(rtalert_val); 950 break; 951 case IP6OPT_JUMBO: 952 /* XXX may need check for alignment */ 953 if (hbhlen < IP6OPT_JUMBO_LEN) { 954 IP6_STATINC(IP6_STAT_TOOSMALL); 955 goto bad; 956 } 957 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) { 958 /* XXX stat */ 959 icmp6_error(m, ICMP6_PARAM_PROB, 960 ICMP6_PARAMPROB_HEADER, 961 erroff + opt + 1 - opthead); 962 return (-1); 963 } 964 optlen = IP6OPT_JUMBO_LEN; 965 966 /* 967 * IPv6 packets that have non 0 payload length 968 * must not contain a jumbo payload option. 969 */ 970 ip6 = mtod(m, struct ip6_hdr *); 971 if (ip6->ip6_plen) { 972 IP6_STATINC(IP6_STAT_BADOPTIONS); 973 icmp6_error(m, ICMP6_PARAM_PROB, 974 ICMP6_PARAMPROB_HEADER, 975 erroff + opt - opthead); 976 return (-1); 977 } 978 979 /* 980 * We may see jumbolen in unaligned location, so 981 * we'd need to perform bcopy(). 982 */ 983 memcpy(&jumboplen, opt + 2, sizeof(jumboplen)); 984 jumboplen = (u_int32_t)htonl(jumboplen); 985 986 #if 1 987 /* 988 * if there are multiple jumbo payload options, 989 * *plenp will be non-zero and the packet will be 990 * rejected. 991 * the behavior may need some debate in ipngwg - 992 * multiple options does not make sense, however, 993 * there's no explicit mention in specification. 994 */ 995 if (*plenp != 0) { 996 IP6_STATINC(IP6_STAT_BADOPTIONS); 997 icmp6_error(m, ICMP6_PARAM_PROB, 998 ICMP6_PARAMPROB_HEADER, 999 erroff + opt + 2 - opthead); 1000 return (-1); 1001 } 1002 #endif 1003 1004 /* 1005 * jumbo payload length must be larger than 65535. 1006 */ 1007 if (jumboplen <= IPV6_MAXPACKET) { 1008 IP6_STATINC(IP6_STAT_BADOPTIONS); 1009 icmp6_error(m, ICMP6_PARAM_PROB, 1010 ICMP6_PARAMPROB_HEADER, 1011 erroff + opt + 2 - opthead); 1012 return (-1); 1013 } 1014 *plenp = jumboplen; 1015 1016 break; 1017 default: /* unknown option */ 1018 if (hbhlen < IP6OPT_MINLEN) { 1019 IP6_STATINC(IP6_STAT_TOOSMALL); 1020 goto bad; 1021 } 1022 optlen = ip6_unknown_opt(opt, m, 1023 erroff + opt - opthead); 1024 if (optlen == -1) 1025 return (-1); 1026 optlen += 2; 1027 break; 1028 } 1029 } 1030 1031 return (0); 1032 1033 bad: 1034 m_freem(m); 1035 return (-1); 1036 } 1037 1038 /* 1039 * Unknown option processing. 1040 * The third argument `off' is the offset from the IPv6 header to the option, 1041 * which is necessary if the IPv6 header the and option header and IPv6 header 1042 * is not continuous in order to return an ICMPv6 error. 1043 */ 1044 int 1045 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off) 1046 { 1047 struct ip6_hdr *ip6; 1048 1049 switch (IP6OPT_TYPE(*optp)) { 1050 case IP6OPT_TYPE_SKIP: /* ignore the option */ 1051 return ((int)*(optp + 1)); 1052 case IP6OPT_TYPE_DISCARD: /* silently discard */ 1053 m_freem(m); 1054 return (-1); 1055 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 1056 IP6_STATINC(IP6_STAT_BADOPTIONS); 1057 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 1058 return (-1); 1059 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 1060 IP6_STATINC(IP6_STAT_BADOPTIONS); 1061 ip6 = mtod(m, struct ip6_hdr *); 1062 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 1063 (m->m_flags & (M_BCAST|M_MCAST))) 1064 m_freem(m); 1065 else 1066 icmp6_error(m, ICMP6_PARAM_PROB, 1067 ICMP6_PARAMPROB_OPTION, off); 1068 return (-1); 1069 } 1070 1071 m_freem(m); /* XXX: NOTREACHED */ 1072 return (-1); 1073 } 1074 1075 /* 1076 * Create the "control" list for this pcb. 1077 * 1078 * The routine will be called from upper layer handlers like tcp6_input(). 1079 * Thus the routine assumes that the caller (tcp6_input) have already 1080 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the 1081 * very first mbuf on the mbuf chain. 1082 * We may want to add some infinite loop prevention or sanity checks for safety. 1083 * (This applies only when you are using KAME mbuf chain restriction, i.e. 1084 * you are using IP6_EXTHDR_CHECK() not m_pulldown()) 1085 */ 1086 void 1087 ip6_savecontrol(struct in6pcb *in6p, struct mbuf **mp, 1088 struct ip6_hdr *ip6, struct mbuf *m) 1089 { 1090 #ifdef RFC2292 1091 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y)) 1092 #else 1093 #define IS2292(x, y) (y) 1094 #endif 1095 1096 if (in6p->in6p_socket->so_options & SO_TIMESTAMP 1097 #ifdef SO_OTIMESTAMP 1098 || in6p->in6p_socket->so_options & SO_OTIMESTAMP 1099 #endif 1100 ) { 1101 struct timeval tv; 1102 1103 microtime(&tv); 1104 #ifdef SO_OTIMESTAMP 1105 if (in6p->in6p_socket->so_options & SO_OTIMESTAMP) { 1106 struct timeval50 tv50; 1107 timeval_to_timeval50(&tv, &tv50); 1108 *mp = sbcreatecontrol((void *) &tv50, sizeof(tv50), 1109 SCM_OTIMESTAMP, SOL_SOCKET); 1110 } else 1111 #endif 1112 *mp = sbcreatecontrol((void *) &tv, sizeof(tv), 1113 SCM_TIMESTAMP, SOL_SOCKET); 1114 if (*mp) 1115 mp = &(*mp)->m_next; 1116 } 1117 1118 /* some OSes call this logic with IPv4 packet, for SO_TIMESTAMP */ 1119 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) 1120 return; 1121 1122 /* RFC 2292 sec. 5 */ 1123 if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) { 1124 struct in6_pktinfo pi6; 1125 1126 memcpy(&pi6.ipi6_addr, &ip6->ip6_dst, sizeof(struct in6_addr)); 1127 in6_clearscope(&pi6.ipi6_addr); /* XXX */ 1128 pi6.ipi6_ifindex = m->m_pkthdr.rcvif_index; 1129 *mp = sbcreatecontrol((void *) &pi6, 1130 sizeof(struct in6_pktinfo), 1131 IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6); 1132 if (*mp) 1133 mp = &(*mp)->m_next; 1134 } 1135 1136 if (in6p->in6p_flags & IN6P_HOPLIMIT) { 1137 int hlim = ip6->ip6_hlim & 0xff; 1138 1139 *mp = sbcreatecontrol((void *) &hlim, sizeof(int), 1140 IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6); 1141 if (*mp) 1142 mp = &(*mp)->m_next; 1143 } 1144 1145 if ((in6p->in6p_flags & IN6P_TCLASS) != 0) { 1146 u_int32_t flowinfo; 1147 int tclass; 1148 1149 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK); 1150 flowinfo >>= 20; 1151 1152 tclass = flowinfo & 0xff; 1153 *mp = sbcreatecontrol((void *)&tclass, sizeof(tclass), 1154 IPV6_TCLASS, IPPROTO_IPV6); 1155 1156 if (*mp) 1157 mp = &(*mp)->m_next; 1158 } 1159 1160 /* 1161 * IPV6_HOPOPTS socket option. Recall that we required super-user 1162 * privilege for the option (see ip6_ctloutput), but it might be too 1163 * strict, since there might be some hop-by-hop options which can be 1164 * returned to normal user. 1165 * See also RFC3542 section 8 (or RFC2292 section 6). 1166 */ 1167 if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0) { 1168 /* 1169 * Check if a hop-by-hop options header is contatined in the 1170 * received packet, and if so, store the options as ancillary 1171 * data. Note that a hop-by-hop options header must be 1172 * just after the IPv6 header, which fact is assured through 1173 * the IPv6 input processing. 1174 */ 1175 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1176 if (xip6->ip6_nxt == IPPROTO_HOPOPTS) { 1177 struct ip6_hbh *hbh; 1178 int hbhlen; 1179 struct mbuf *ext; 1180 1181 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr), 1182 xip6->ip6_nxt); 1183 if (ext == NULL) { 1184 IP6_STATINC(IP6_STAT_TOOSHORT); 1185 return; 1186 } 1187 hbh = mtod(ext, struct ip6_hbh *); 1188 hbhlen = (hbh->ip6h_len + 1) << 3; 1189 if (hbhlen != ext->m_len) { 1190 m_freem(ext); 1191 IP6_STATINC(IP6_STAT_TOOSHORT); 1192 return; 1193 } 1194 1195 /* 1196 * XXX: We copy whole the header even if a jumbo 1197 * payload option is included, which option is to 1198 * be removed before returning in the RFC 2292. 1199 * Note: this constraint is removed in RFC3542. 1200 */ 1201 *mp = sbcreatecontrol((void *)hbh, hbhlen, 1202 IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS), 1203 IPPROTO_IPV6); 1204 if (*mp) 1205 mp = &(*mp)->m_next; 1206 m_freem(ext); 1207 } 1208 } 1209 1210 /* IPV6_DSTOPTS and IPV6_RTHDR socket options */ 1211 if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) { 1212 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1213 int nxt = xip6->ip6_nxt, off = sizeof(struct ip6_hdr); 1214 1215 /* 1216 * Search for destination options headers or routing 1217 * header(s) through the header chain, and stores each 1218 * header as ancillary data. 1219 * Note that the order of the headers remains in 1220 * the chain of ancillary data. 1221 */ 1222 for (;;) { /* is explicit loop prevention necessary? */ 1223 struct ip6_ext *ip6e = NULL; 1224 int elen; 1225 struct mbuf *ext = NULL; 1226 1227 /* 1228 * if it is not an extension header, don't try to 1229 * pull it from the chain. 1230 */ 1231 switch (nxt) { 1232 case IPPROTO_DSTOPTS: 1233 case IPPROTO_ROUTING: 1234 case IPPROTO_HOPOPTS: 1235 case IPPROTO_AH: /* is it possible? */ 1236 break; 1237 default: 1238 goto loopend; 1239 } 1240 1241 ext = ip6_pullexthdr(m, off, nxt); 1242 if (ext == NULL) { 1243 IP6_STATINC(IP6_STAT_TOOSHORT); 1244 return; 1245 } 1246 ip6e = mtod(ext, struct ip6_ext *); 1247 if (nxt == IPPROTO_AH) 1248 elen = (ip6e->ip6e_len + 2) << 2; 1249 else 1250 elen = (ip6e->ip6e_len + 1) << 3; 1251 if (elen != ext->m_len) { 1252 m_freem(ext); 1253 IP6_STATINC(IP6_STAT_TOOSHORT); 1254 return; 1255 } 1256 KASSERT(IP6_HDR_ALIGNED_P(ip6e)); 1257 1258 switch (nxt) { 1259 case IPPROTO_DSTOPTS: 1260 if (!(in6p->in6p_flags & IN6P_DSTOPTS)) 1261 break; 1262 1263 *mp = sbcreatecontrol((void *)ip6e, elen, 1264 IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS), 1265 IPPROTO_IPV6); 1266 if (*mp) 1267 mp = &(*mp)->m_next; 1268 break; 1269 1270 case IPPROTO_ROUTING: 1271 if (!(in6p->in6p_flags & IN6P_RTHDR)) 1272 break; 1273 1274 *mp = sbcreatecontrol((void *)ip6e, elen, 1275 IS2292(IPV6_2292RTHDR, IPV6_RTHDR), 1276 IPPROTO_IPV6); 1277 if (*mp) 1278 mp = &(*mp)->m_next; 1279 break; 1280 1281 case IPPROTO_HOPOPTS: 1282 case IPPROTO_AH: /* is it possible? */ 1283 break; 1284 1285 default: 1286 /* 1287 * other cases have been filtered in the above. 1288 * none will visit this case. here we supply 1289 * the code just in case (nxt overwritten or 1290 * other cases). 1291 */ 1292 m_freem(ext); 1293 goto loopend; 1294 1295 } 1296 1297 /* proceed with the next header. */ 1298 off += elen; 1299 nxt = ip6e->ip6e_nxt; 1300 ip6e = NULL; 1301 m_freem(ext); 1302 ext = NULL; 1303 } 1304 loopend: 1305 ; 1306 } 1307 } 1308 #undef IS2292 1309 1310 1311 void 1312 ip6_notify_pmtu(struct in6pcb *in6p, const struct sockaddr_in6 *dst, 1313 uint32_t *mtu) 1314 { 1315 struct socket *so; 1316 struct mbuf *m_mtu; 1317 struct ip6_mtuinfo mtuctl; 1318 1319 so = in6p->in6p_socket; 1320 1321 if (mtu == NULL) 1322 return; 1323 1324 #ifdef DIAGNOSTIC 1325 if (so == NULL) /* I believe this is impossible */ 1326 panic("ip6_notify_pmtu: socket is NULL"); 1327 #endif 1328 1329 memset(&mtuctl, 0, sizeof(mtuctl)); /* zero-clear for safety */ 1330 mtuctl.ip6m_mtu = *mtu; 1331 mtuctl.ip6m_addr = *dst; 1332 if (sa6_recoverscope(&mtuctl.ip6m_addr)) 1333 return; 1334 1335 if ((m_mtu = sbcreatecontrol((void *)&mtuctl, sizeof(mtuctl), 1336 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL) 1337 return; 1338 1339 if (sbappendaddr(&so->so_rcv, (const struct sockaddr *)dst, NULL, m_mtu) 1340 == 0) { 1341 m_freem(m_mtu); 1342 /* XXX: should count statistics */ 1343 } else 1344 sorwakeup(so); 1345 1346 return; 1347 } 1348 1349 /* 1350 * pull single extension header from mbuf chain. returns single mbuf that 1351 * contains the result, or NULL on error. 1352 */ 1353 static struct mbuf * 1354 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt) 1355 { 1356 struct ip6_ext ip6e; 1357 size_t elen; 1358 struct mbuf *n; 1359 1360 #ifdef DIAGNOSTIC 1361 switch (nxt) { 1362 case IPPROTO_DSTOPTS: 1363 case IPPROTO_ROUTING: 1364 case IPPROTO_HOPOPTS: 1365 case IPPROTO_AH: /* is it possible? */ 1366 break; 1367 default: 1368 printf("ip6_pullexthdr: invalid nxt=%d\n", nxt); 1369 } 1370 #endif 1371 1372 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1373 if (nxt == IPPROTO_AH) 1374 elen = (ip6e.ip6e_len + 2) << 2; 1375 else 1376 elen = (ip6e.ip6e_len + 1) << 3; 1377 1378 MGET(n, M_DONTWAIT, MT_DATA); 1379 if (n && elen >= MLEN) { 1380 MCLGET(n, M_DONTWAIT); 1381 if ((n->m_flags & M_EXT) == 0) { 1382 m_free(n); 1383 n = NULL; 1384 } 1385 } 1386 if (!n) 1387 return NULL; 1388 1389 n->m_len = 0; 1390 if (elen >= M_TRAILINGSPACE(n)) { 1391 m_free(n); 1392 return NULL; 1393 } 1394 1395 m_copydata(m, off, elen, mtod(n, void *)); 1396 n->m_len = elen; 1397 return n; 1398 } 1399 1400 /* 1401 * Get pointer to the previous header followed by the header 1402 * currently processed. 1403 * XXX: This function supposes that 1404 * M includes all headers, 1405 * the next header field and the header length field of each header 1406 * are valid, and 1407 * the sum of each header length equals to OFF. 1408 * Because of these assumptions, this function must be called very 1409 * carefully. Moreover, it will not be used in the near future when 1410 * we develop `neater' mechanism to process extension headers. 1411 */ 1412 u_int8_t * 1413 ip6_get_prevhdr(struct mbuf *m, int off) 1414 { 1415 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1416 1417 if (off == sizeof(struct ip6_hdr)) 1418 return (&ip6->ip6_nxt); 1419 else { 1420 int len, nxt; 1421 struct ip6_ext *ip6e = NULL; 1422 1423 nxt = ip6->ip6_nxt; 1424 len = sizeof(struct ip6_hdr); 1425 while (len < off) { 1426 ip6e = (struct ip6_ext *)(mtod(m, char *) + len); 1427 1428 switch (nxt) { 1429 case IPPROTO_FRAGMENT: 1430 len += sizeof(struct ip6_frag); 1431 break; 1432 case IPPROTO_AH: 1433 len += (ip6e->ip6e_len + 2) << 2; 1434 break; 1435 default: 1436 len += (ip6e->ip6e_len + 1) << 3; 1437 break; 1438 } 1439 nxt = ip6e->ip6e_nxt; 1440 } 1441 if (ip6e) 1442 return (&ip6e->ip6e_nxt); 1443 else 1444 return NULL; 1445 } 1446 } 1447 1448 /* 1449 * get next header offset. m will be retained. 1450 */ 1451 int 1452 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp) 1453 { 1454 struct ip6_hdr ip6; 1455 struct ip6_ext ip6e; 1456 struct ip6_frag fh; 1457 1458 /* just in case */ 1459 if (m == NULL) 1460 panic("ip6_nexthdr: m == NULL"); 1461 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off) 1462 return -1; 1463 1464 switch (proto) { 1465 case IPPROTO_IPV6: 1466 /* do not chase beyond intermediate IPv6 headers */ 1467 if (off != 0) 1468 return -1; 1469 if (m->m_pkthdr.len < off + sizeof(ip6)) 1470 return -1; 1471 m_copydata(m, off, sizeof(ip6), (void *)&ip6); 1472 if (nxtp) 1473 *nxtp = ip6.ip6_nxt; 1474 off += sizeof(ip6); 1475 return off; 1476 1477 case IPPROTO_FRAGMENT: 1478 /* 1479 * terminate parsing if it is not the first fragment, 1480 * it does not make sense to parse through it. 1481 */ 1482 if (m->m_pkthdr.len < off + sizeof(fh)) 1483 return -1; 1484 m_copydata(m, off, sizeof(fh), (void *)&fh); 1485 if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0) 1486 return -1; 1487 if (nxtp) 1488 *nxtp = fh.ip6f_nxt; 1489 off += sizeof(struct ip6_frag); 1490 return off; 1491 1492 case IPPROTO_AH: 1493 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1494 return -1; 1495 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1496 if (nxtp) 1497 *nxtp = ip6e.ip6e_nxt; 1498 off += (ip6e.ip6e_len + 2) << 2; 1499 if (m->m_pkthdr.len < off) 1500 return -1; 1501 return off; 1502 1503 case IPPROTO_HOPOPTS: 1504 case IPPROTO_ROUTING: 1505 case IPPROTO_DSTOPTS: 1506 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1507 return -1; 1508 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1509 if (nxtp) 1510 *nxtp = ip6e.ip6e_nxt; 1511 off += (ip6e.ip6e_len + 1) << 3; 1512 if (m->m_pkthdr.len < off) 1513 return -1; 1514 return off; 1515 1516 case IPPROTO_NONE: 1517 case IPPROTO_ESP: 1518 case IPPROTO_IPCOMP: 1519 /* give up */ 1520 return -1; 1521 1522 default: 1523 return -1; 1524 } 1525 } 1526 1527 /* 1528 * get offset for the last header in the chain. m will be kept untainted. 1529 */ 1530 int 1531 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp) 1532 { 1533 int newoff; 1534 int nxt; 1535 1536 if (!nxtp) { 1537 nxt = -1; 1538 nxtp = &nxt; 1539 } 1540 for (;;) { 1541 newoff = ip6_nexthdr(m, off, proto, nxtp); 1542 if (newoff < 0) 1543 return off; 1544 else if (newoff < off) 1545 return -1; /* invalid */ 1546 else if (newoff == off) 1547 return newoff; 1548 1549 off = newoff; 1550 proto = *nxtp; 1551 } 1552 } 1553 1554 struct m_tag * 1555 ip6_addaux(struct mbuf *m) 1556 { 1557 struct m_tag *mtag; 1558 1559 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1560 if (!mtag) { 1561 mtag = m_tag_get(PACKET_TAG_INET6, sizeof(struct ip6aux), 1562 M_NOWAIT); 1563 if (mtag) { 1564 m_tag_prepend(m, mtag); 1565 memset(mtag + 1, 0, sizeof(struct ip6aux)); 1566 } 1567 } 1568 return mtag; 1569 } 1570 1571 struct m_tag * 1572 ip6_findaux(struct mbuf *m) 1573 { 1574 struct m_tag *mtag; 1575 1576 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1577 return mtag; 1578 } 1579 1580 void 1581 ip6_delaux(struct mbuf *m) 1582 { 1583 struct m_tag *mtag; 1584 1585 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1586 if (mtag) 1587 m_tag_delete(m, mtag); 1588 } 1589 1590 /* 1591 * System control for IP6 1592 */ 1593 1594 const u_char inet6ctlerrmap[PRC_NCMDS] = { 1595 0, 0, 0, 0, 1596 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 1597 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 1598 EMSGSIZE, EHOSTUNREACH, 0, 0, 1599 0, 0, 0, 0, 1600 ENOPROTOOPT 1601 }; 1602 1603 extern int sysctl_net_inet6_addrctlpolicy(SYSCTLFN_ARGS); 1604 1605 static int 1606 sysctl_net_inet6_ip6_stats(SYSCTLFN_ARGS) 1607 { 1608 1609 return (NETSTAT_SYSCTL(ip6stat_percpu, IP6_NSTATS)); 1610 } 1611 1612 static void 1613 sysctl_net_inet6_ip6_setup(struct sysctllog **clog) 1614 { 1615 #ifdef RFC2292 1616 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y)) 1617 #else 1618 #define IS2292(x, y) (y) 1619 #endif 1620 1621 sysctl_createv(clog, 0, NULL, NULL, 1622 CTLFLAG_PERMANENT, 1623 CTLTYPE_NODE, "inet6", 1624 SYSCTL_DESCR("PF_INET6 related settings"), 1625 NULL, 0, NULL, 0, 1626 CTL_NET, PF_INET6, CTL_EOL); 1627 sysctl_createv(clog, 0, NULL, NULL, 1628 CTLFLAG_PERMANENT, 1629 CTLTYPE_NODE, "ip6", 1630 SYSCTL_DESCR("IPv6 related settings"), 1631 NULL, 0, NULL, 0, 1632 CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_EOL); 1633 1634 sysctl_createv(clog, 0, NULL, NULL, 1635 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1636 CTLTYPE_INT, "forwarding", 1637 SYSCTL_DESCR("Enable forwarding of INET6 datagrams"), 1638 NULL, 0, &ip6_forwarding, 0, 1639 CTL_NET, PF_INET6, IPPROTO_IPV6, 1640 IPV6CTL_FORWARDING, CTL_EOL); 1641 sysctl_createv(clog, 0, NULL, NULL, 1642 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1643 CTLTYPE_INT, "redirect", 1644 SYSCTL_DESCR("Enable sending of ICMPv6 redirect messages"), 1645 NULL, 0, &ip6_sendredirects, 0, 1646 CTL_NET, PF_INET6, IPPROTO_IPV6, 1647 IPV6CTL_SENDREDIRECTS, CTL_EOL); 1648 sysctl_createv(clog, 0, NULL, NULL, 1649 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1650 CTLTYPE_INT, "hlim", 1651 SYSCTL_DESCR("Hop limit for an INET6 datagram"), 1652 NULL, 0, &ip6_defhlim, 0, 1653 CTL_NET, PF_INET6, IPPROTO_IPV6, 1654 IPV6CTL_DEFHLIM, CTL_EOL); 1655 #ifdef notyet 1656 sysctl_createv(clog, 0, NULL, NULL, 1657 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1658 CTLTYPE_INT, "mtu", NULL, 1659 NULL, 0, &, 0, 1660 CTL_NET, PF_INET6, IPPROTO_IPV6, 1661 IPV6CTL_DEFMTU, CTL_EOL); 1662 #endif 1663 #ifdef __no_idea__ 1664 sysctl_createv(clog, 0, NULL, NULL, 1665 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1666 CTLTYPE_INT, "forwsrcrt", NULL, 1667 NULL, 0, &?, 0, 1668 CTL_NET, PF_INET6, IPPROTO_IPV6, 1669 IPV6CTL_FORWSRCRT, CTL_EOL); 1670 sysctl_createv(clog, 0, NULL, NULL, 1671 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1672 CTLTYPE_STRUCT, "mrtstats", NULL, 1673 NULL, 0, &?, sizeof(?), 1674 CTL_NET, PF_INET6, IPPROTO_IPV6, 1675 IPV6CTL_MRTSTATS, CTL_EOL); 1676 sysctl_createv(clog, 0, NULL, NULL, 1677 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1678 CTLTYPE_?, "mrtproto", NULL, 1679 NULL, 0, &?, sizeof(?), 1680 CTL_NET, PF_INET6, IPPROTO_IPV6, 1681 IPV6CTL_MRTPROTO, CTL_EOL); 1682 #endif 1683 sysctl_createv(clog, 0, NULL, NULL, 1684 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1685 CTLTYPE_INT, "maxfragpackets", 1686 SYSCTL_DESCR("Maximum number of fragments to buffer " 1687 "for reassembly"), 1688 NULL, 0, &ip6_maxfragpackets, 0, 1689 CTL_NET, PF_INET6, IPPROTO_IPV6, 1690 IPV6CTL_MAXFRAGPACKETS, CTL_EOL); 1691 #ifdef __no_idea__ 1692 sysctl_createv(clog, 0, NULL, NULL, 1693 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1694 CTLTYPE_INT, "sourcecheck", NULL, 1695 NULL, 0, &?, 0, 1696 CTL_NET, PF_INET6, IPPROTO_IPV6, 1697 IPV6CTL_SOURCECHECK, CTL_EOL); 1698 sysctl_createv(clog, 0, NULL, NULL, 1699 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1700 CTLTYPE_INT, "sourcecheck_logint", NULL, 1701 NULL, 0, &?, 0, 1702 CTL_NET, PF_INET6, IPPROTO_IPV6, 1703 IPV6CTL_SOURCECHECK_LOGINT, CTL_EOL); 1704 #endif 1705 sysctl_createv(clog, 0, NULL, NULL, 1706 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1707 CTLTYPE_INT, "accept_rtadv", 1708 SYSCTL_DESCR("Accept router advertisements"), 1709 NULL, 0, &ip6_accept_rtadv, 0, 1710 CTL_NET, PF_INET6, IPPROTO_IPV6, 1711 IPV6CTL_ACCEPT_RTADV, CTL_EOL); 1712 sysctl_createv(clog, 0, NULL, NULL, 1713 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1714 CTLTYPE_INT, "rtadv_maxroutes", 1715 SYSCTL_DESCR("Maximum number of routes accepted via router advertisements"), 1716 NULL, 0, &ip6_rtadv_maxroutes, 0, 1717 CTL_NET, PF_INET6, IPPROTO_IPV6, 1718 IPV6CTL_RTADV_MAXROUTES, CTL_EOL); 1719 sysctl_createv(clog, 0, NULL, NULL, 1720 CTLFLAG_PERMANENT, 1721 CTLTYPE_INT, "rtadv_numroutes", 1722 SYSCTL_DESCR("Current number of routes accepted via router advertisements"), 1723 NULL, 0, &nd6_numroutes, 0, 1724 CTL_NET, PF_INET6, IPPROTO_IPV6, 1725 IPV6CTL_RTADV_NUMROUTES, CTL_EOL); 1726 sysctl_createv(clog, 0, NULL, NULL, 1727 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1728 CTLTYPE_INT, "keepfaith", 1729 SYSCTL_DESCR("Activate faith interface"), 1730 NULL, 0, &ip6_keepfaith, 0, 1731 CTL_NET, PF_INET6, IPPROTO_IPV6, 1732 IPV6CTL_KEEPFAITH, CTL_EOL); 1733 sysctl_createv(clog, 0, NULL, NULL, 1734 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1735 CTLTYPE_INT, "log_interval", 1736 SYSCTL_DESCR("Minumum interval between logging " 1737 "unroutable packets"), 1738 NULL, 0, &ip6_log_interval, 0, 1739 CTL_NET, PF_INET6, IPPROTO_IPV6, 1740 IPV6CTL_LOG_INTERVAL, CTL_EOL); 1741 sysctl_createv(clog, 0, NULL, NULL, 1742 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1743 CTLTYPE_INT, "hdrnestlimit", 1744 SYSCTL_DESCR("Maximum number of nested IPv6 headers"), 1745 NULL, 0, &ip6_hdrnestlimit, 0, 1746 CTL_NET, PF_INET6, IPPROTO_IPV6, 1747 IPV6CTL_HDRNESTLIMIT, CTL_EOL); 1748 sysctl_createv(clog, 0, NULL, NULL, 1749 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1750 CTLTYPE_INT, "dad_count", 1751 SYSCTL_DESCR("Number of Duplicate Address Detection " 1752 "probes to send"), 1753 NULL, 0, &ip6_dad_count, 0, 1754 CTL_NET, PF_INET6, IPPROTO_IPV6, 1755 IPV6CTL_DAD_COUNT, CTL_EOL); 1756 sysctl_createv(clog, 0, NULL, NULL, 1757 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1758 CTLTYPE_INT, "auto_flowlabel", 1759 SYSCTL_DESCR("Assign random IPv6 flow labels"), 1760 NULL, 0, &ip6_auto_flowlabel, 0, 1761 CTL_NET, PF_INET6, IPPROTO_IPV6, 1762 IPV6CTL_AUTO_FLOWLABEL, CTL_EOL); 1763 sysctl_createv(clog, 0, NULL, NULL, 1764 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1765 CTLTYPE_INT, "defmcasthlim", 1766 SYSCTL_DESCR("Default multicast hop limit"), 1767 NULL, 0, &ip6_defmcasthlim, 0, 1768 CTL_NET, PF_INET6, IPPROTO_IPV6, 1769 IPV6CTL_DEFMCASTHLIM, CTL_EOL); 1770 sysctl_createv(clog, 0, NULL, NULL, 1771 CTLFLAG_PERMANENT, 1772 CTLTYPE_STRING, "kame_version", 1773 SYSCTL_DESCR("KAME Version"), 1774 NULL, 0, __UNCONST(__KAME_VERSION), 0, 1775 CTL_NET, PF_INET6, IPPROTO_IPV6, 1776 IPV6CTL_KAME_VERSION, CTL_EOL); 1777 sysctl_createv(clog, 0, NULL, NULL, 1778 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1779 CTLTYPE_INT, "use_deprecated", 1780 SYSCTL_DESCR("Allow use of deprecated addresses as " 1781 "source addresses"), 1782 NULL, 0, &ip6_use_deprecated, 0, 1783 CTL_NET, PF_INET6, IPPROTO_IPV6, 1784 IPV6CTL_USE_DEPRECATED, CTL_EOL); 1785 sysctl_createv(clog, 0, NULL, NULL, 1786 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1787 CTLTYPE_INT, "rr_prune", NULL, 1788 NULL, 0, &ip6_rr_prune, 0, 1789 CTL_NET, PF_INET6, IPPROTO_IPV6, 1790 IPV6CTL_RR_PRUNE, CTL_EOL); 1791 sysctl_createv(clog, 0, NULL, NULL, 1792 CTLFLAG_PERMANENT 1793 #ifndef INET6_BINDV6ONLY 1794 |CTLFLAG_READWRITE, 1795 #endif 1796 CTLTYPE_INT, "v6only", 1797 SYSCTL_DESCR("Disallow PF_INET6 sockets from connecting " 1798 "to PF_INET sockets"), 1799 NULL, 0, &ip6_v6only, 0, 1800 CTL_NET, PF_INET6, IPPROTO_IPV6, 1801 IPV6CTL_V6ONLY, CTL_EOL); 1802 sysctl_createv(clog, 0, NULL, NULL, 1803 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1804 CTLTYPE_INT, "anonportmin", 1805 SYSCTL_DESCR("Lowest ephemeral port number to assign"), 1806 sysctl_net_inet_ip_ports, 0, &ip6_anonportmin, 0, 1807 CTL_NET, PF_INET6, IPPROTO_IPV6, 1808 IPV6CTL_ANONPORTMIN, CTL_EOL); 1809 sysctl_createv(clog, 0, NULL, NULL, 1810 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1811 CTLTYPE_INT, "anonportmax", 1812 SYSCTL_DESCR("Highest ephemeral port number to assign"), 1813 sysctl_net_inet_ip_ports, 0, &ip6_anonportmax, 0, 1814 CTL_NET, PF_INET6, IPPROTO_IPV6, 1815 IPV6CTL_ANONPORTMAX, CTL_EOL); 1816 #ifndef IPNOPRIVPORTS 1817 sysctl_createv(clog, 0, NULL, NULL, 1818 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1819 CTLTYPE_INT, "lowportmin", 1820 SYSCTL_DESCR("Lowest privileged ephemeral port number " 1821 "to assign"), 1822 sysctl_net_inet_ip_ports, 0, &ip6_lowportmin, 0, 1823 CTL_NET, PF_INET6, IPPROTO_IPV6, 1824 IPV6CTL_LOWPORTMIN, CTL_EOL); 1825 sysctl_createv(clog, 0, NULL, NULL, 1826 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1827 CTLTYPE_INT, "lowportmax", 1828 SYSCTL_DESCR("Highest privileged ephemeral port number " 1829 "to assign"), 1830 sysctl_net_inet_ip_ports, 0, &ip6_lowportmax, 0, 1831 CTL_NET, PF_INET6, IPPROTO_IPV6, 1832 IPV6CTL_LOWPORTMAX, CTL_EOL); 1833 #endif /* IPNOPRIVPORTS */ 1834 sysctl_createv(clog, 0, NULL, NULL, 1835 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1836 CTLTYPE_INT, "auto_linklocal", 1837 SYSCTL_DESCR("Default value of per-interface flag for " 1838 "adding an IPv6 link-local address to " 1839 "interfaces when attached"), 1840 NULL, 0, &ip6_auto_linklocal, 0, 1841 CTL_NET, PF_INET6, IPPROTO_IPV6, 1842 IPV6CTL_AUTO_LINKLOCAL, CTL_EOL); 1843 sysctl_createv(clog, 0, NULL, NULL, 1844 CTLFLAG_PERMANENT|CTLFLAG_READONLY, 1845 CTLTYPE_STRUCT, "addctlpolicy", 1846 SYSCTL_DESCR("Return the current address control" 1847 " policy"), 1848 sysctl_net_inet6_addrctlpolicy, 0, NULL, 0, 1849 CTL_NET, PF_INET6, IPPROTO_IPV6, 1850 IPV6CTL_ADDRCTLPOLICY, CTL_EOL); 1851 sysctl_createv(clog, 0, NULL, NULL, 1852 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1853 CTLTYPE_INT, "use_tempaddr", 1854 SYSCTL_DESCR("Use temporary address"), 1855 NULL, 0, &ip6_use_tempaddr, 0, 1856 CTL_NET, PF_INET6, IPPROTO_IPV6, 1857 CTL_CREATE, CTL_EOL); 1858 sysctl_createv(clog, 0, NULL, NULL, 1859 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1860 CTLTYPE_INT, "prefer_tempaddr", 1861 SYSCTL_DESCR("Prefer temporary address as source " 1862 "address"), 1863 NULL, 0, &ip6_prefer_tempaddr, 0, 1864 CTL_NET, PF_INET6, IPPROTO_IPV6, 1865 CTL_CREATE, CTL_EOL); 1866 sysctl_createv(clog, 0, NULL, NULL, 1867 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1868 CTLTYPE_INT, "temppltime", 1869 SYSCTL_DESCR("preferred lifetime of a temporary address"), 1870 NULL, 0, &ip6_temp_preferred_lifetime, 0, 1871 CTL_NET, PF_INET6, IPPROTO_IPV6, 1872 CTL_CREATE, CTL_EOL); 1873 sysctl_createv(clog, 0, NULL, NULL, 1874 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1875 CTLTYPE_INT, "tempvltime", 1876 SYSCTL_DESCR("valid lifetime of a temporary address"), 1877 NULL, 0, &ip6_temp_valid_lifetime, 0, 1878 CTL_NET, PF_INET6, IPPROTO_IPV6, 1879 CTL_CREATE, CTL_EOL); 1880 sysctl_createv(clog, 0, NULL, NULL, 1881 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1882 CTLTYPE_INT, "maxfrags", 1883 SYSCTL_DESCR("Maximum fragments in reassembly queue"), 1884 NULL, 0, &ip6_maxfrags, 0, 1885 CTL_NET, PF_INET6, IPPROTO_IPV6, 1886 IPV6CTL_MAXFRAGS, CTL_EOL); 1887 sysctl_createv(clog, 0, NULL, NULL, 1888 CTLFLAG_PERMANENT, 1889 CTLTYPE_STRUCT, "stats", 1890 SYSCTL_DESCR("IPv6 statistics"), 1891 sysctl_net_inet6_ip6_stats, 0, NULL, 0, 1892 CTL_NET, PF_INET6, IPPROTO_IPV6, 1893 IPV6CTL_STATS, CTL_EOL); 1894 sysctl_createv(clog, 0, NULL, NULL, 1895 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1896 CTLTYPE_INT, "use_defaultzone", 1897 SYSCTL_DESCR("Whether to use the default scope zones"), 1898 NULL, 0, &ip6_use_defzone, 0, 1899 CTL_NET, PF_INET6, IPPROTO_IPV6, 1900 IPV6CTL_USE_DEFAULTZONE, CTL_EOL); 1901 sysctl_createv(clog, 0, NULL, NULL, 1902 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1903 CTLTYPE_INT, "mcast_pmtu", 1904 SYSCTL_DESCR("Enable pMTU discovery for multicast packet"), 1905 NULL, 0, &ip6_mcast_pmtu, 0, 1906 CTL_NET, PF_INET6, IPPROTO_IPV6, 1907 CTL_CREATE, CTL_EOL); 1908 /* anonportalgo RFC6056 subtree */ 1909 const struct sysctlnode *portalgo_node; 1910 sysctl_createv(clog, 0, NULL, &portalgo_node, 1911 CTLFLAG_PERMANENT, 1912 CTLTYPE_NODE, "anonportalgo", 1913 SYSCTL_DESCR("Anonymous port algorithm selection (RFC 6056)"), 1914 NULL, 0, NULL, 0, 1915 CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_CREATE, CTL_EOL); 1916 sysctl_createv(clog, 0, &portalgo_node, NULL, 1917 CTLFLAG_PERMANENT, 1918 CTLTYPE_STRING, "available", 1919 SYSCTL_DESCR("available algorithms"), 1920 sysctl_portalgo_available, 0, NULL, PORTALGO_MAXLEN, 1921 CTL_CREATE, CTL_EOL); 1922 sysctl_createv(clog, 0, &portalgo_node, NULL, 1923 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1924 CTLTYPE_STRING, "selected", 1925 SYSCTL_DESCR("selected algorithm"), 1926 sysctl_portalgo_selected6, 0, NULL, PORTALGO_MAXLEN, 1927 CTL_CREATE, CTL_EOL); 1928 sysctl_createv(clog, 0, &portalgo_node, NULL, 1929 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1930 CTLTYPE_STRUCT, "reserve", 1931 SYSCTL_DESCR("bitmap of reserved ports"), 1932 sysctl_portalgo_reserve6, 0, NULL, 0, 1933 CTL_CREATE, CTL_EOL); 1934 sysctl_createv(clog, 0, NULL, NULL, 1935 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1936 CTLTYPE_INT, "neighborgcthresh", 1937 SYSCTL_DESCR("Maximum number of entries in neighbor" 1938 " cache"), 1939 NULL, 1, &ip6_neighborgcthresh, 0, 1940 CTL_NET, PF_INET6, IPPROTO_IPV6, 1941 CTL_CREATE, CTL_EOL); 1942 sysctl_createv(clog, 0, NULL, NULL, 1943 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1944 CTLTYPE_INT, "maxifprefixes", 1945 SYSCTL_DESCR("Maximum number of prefixes created by" 1946 " route advertisement per interface"), 1947 NULL, 1, &ip6_maxifprefixes, 0, 1948 CTL_NET, PF_INET6, IPPROTO_IPV6, 1949 CTL_CREATE, CTL_EOL); 1950 sysctl_createv(clog, 0, NULL, NULL, 1951 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1952 CTLTYPE_INT, "maxifdefrouters", 1953 SYSCTL_DESCR("Maximum number of default routers created" 1954 " by route advertisement per interface"), 1955 NULL, 1, &ip6_maxifdefrouters, 0, 1956 CTL_NET, PF_INET6, IPPROTO_IPV6, 1957 CTL_CREATE, CTL_EOL); 1958 sysctl_createv(clog, 0, NULL, NULL, 1959 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1960 CTLTYPE_INT, "maxdynroutes", 1961 SYSCTL_DESCR("Maximum number of routes created via" 1962 " redirect"), 1963 NULL, 1, &ip6_maxdynroutes, 0, 1964 CTL_NET, PF_INET6, IPPROTO_IPV6, 1965 CTL_CREATE, CTL_EOL); 1966 } 1967 1968 void 1969 ip6_statinc(u_int stat) 1970 { 1971 1972 KASSERT(stat < IP6_NSTATS); 1973 IP6_STATINC(stat); 1974 } 1975
Indexes created Wed Sep 24 14:09:57 GMT 2025