ip6_input.c revision 1.172
1 /* $NetBSD: ip6_input.c,v 1.172 2017/01/16 07:33:36 ryo 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 1.172 2017/01/16 07:33:36 ryo 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 char ip6bufs[INET6_ADDRSTRLEN]; 532 char ip6bufd[INET6_ADDRSTRLEN]; 533 nd6log(LOG_INFO, "packet to an unready address %s->%s\n", 534 ip6_sprintf(ip6bufs, &ip6->ip6_src), 535 ip6_sprintf(ip6bufd, &ip6->ip6_dst)); 536 537 goto bad_unref; 538 } 539 } 540 541 /* 542 * FAITH (Firewall Aided Internet Translator) 543 */ 544 #if defined(NFAITH) && 0 < NFAITH 545 if (ip6_keepfaith) { 546 if (rt != NULL && rt->rt_ifp != NULL && 547 rt->rt_ifp->if_type == IFT_FAITH) { 548 /* XXX do we need more sanity checks? */ 549 ours = 1; 550 deliverifp = rt->rt_ifp; /* faith */ 551 goto hbhcheck; 552 } 553 } 554 #endif 555 556 #if 0 557 { 558 /* 559 * Last resort: check in6_ifaddr for incoming interface. 560 * The code is here until I update the "goto ours hack" code above 561 * working right. 562 */ 563 struct ifaddr *ifa; 564 IFADDR_READER_FOREACH(ifa, rcvif) { 565 if (ifa->ifa_addr->sa_family != AF_INET6) 566 continue; 567 if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) { 568 ours = 1; 569 deliverifp = ifa->ifa_ifp; 570 goto hbhcheck; 571 } 572 } 573 } 574 #endif 575 576 /* 577 * Now there is no reason to process the packet if it's not our own 578 * and we're not a router. 579 */ 580 if (!ip6_forwarding) { 581 IP6_STATINC(IP6_STAT_CANTFORWARD); 582 in6_ifstat_inc(rcvif, ifs6_in_discard); 583 goto bad_unref; 584 } 585 586 hbhcheck: 587 /* 588 * record address information into m_tag, if we don't have one yet. 589 * note that we are unable to record it, if the address is not listed 590 * as our interface address (e.g. multicast addresses, addresses 591 * within FAITH prefixes and such). 592 */ 593 if (deliverifp && ip6_getdstifaddr(m) == NULL) { 594 struct in6_ifaddr *ia6; 595 int s = pserialize_read_enter(); 596 597 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 598 /* Depends on ip6_setdstifaddr never sleep */ 599 if (ia6 != NULL && ip6_setdstifaddr(m, ia6) == NULL) { 600 /* 601 * XXX maybe we should drop the packet here, 602 * as we could not provide enough information 603 * to the upper layers. 604 */ 605 } 606 pserialize_read_exit(s); 607 } 608 609 /* 610 * Process Hop-by-Hop options header if it's contained. 611 * m may be modified in ip6_hopopts_input(). 612 * If a JumboPayload option is included, plen will also be modified. 613 */ 614 plen = (u_int32_t)ntohs(ip6->ip6_plen); 615 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 616 struct ip6_hbh *hbh; 617 618 if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) { 619 #if 0 /*touches NULL pointer*/ 620 in6_ifstat_inc(rcvif, ifs6_in_discard); 621 #endif 622 rtcache_unref(rt, ro); 623 percpu_putref(ip6_forward_rt_percpu); 624 return; /* m have already been freed */ 625 } 626 627 /* adjust pointer */ 628 ip6 = mtod(m, struct ip6_hdr *); 629 630 /* 631 * if the payload length field is 0 and the next header field 632 * indicates Hop-by-Hop Options header, then a Jumbo Payload 633 * option MUST be included. 634 */ 635 if (ip6->ip6_plen == 0 && plen == 0) { 636 /* 637 * Note that if a valid jumbo payload option is 638 * contained, ip6_hopopts_input() must set a valid 639 * (non-zero) payload length to the variable plen. 640 */ 641 IP6_STATINC(IP6_STAT_BADOPTIONS); 642 in6_ifstat_inc(rcvif, ifs6_in_discard); 643 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 644 icmp6_error(m, ICMP6_PARAM_PROB, 645 ICMP6_PARAMPROB_HEADER, 646 (char *)&ip6->ip6_plen - (char *)ip6); 647 rtcache_unref(rt, ro); 648 percpu_putref(ip6_forward_rt_percpu); 649 return; 650 } 651 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 652 sizeof(struct ip6_hbh)); 653 if (hbh == NULL) { 654 IP6_STATINC(IP6_STAT_TOOSHORT); 655 rtcache_unref(rt, ro); 656 percpu_putref(ip6_forward_rt_percpu); 657 return; 658 } 659 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 660 nxt = hbh->ip6h_nxt; 661 662 /* 663 * accept the packet if a router alert option is included 664 * and we act as an IPv6 router. 665 */ 666 if (rtalert != ~0 && ip6_forwarding) 667 ours = 1; 668 } else 669 nxt = ip6->ip6_nxt; 670 671 /* 672 * Check that the amount of data in the buffers 673 * is as at least much as the IPv6 header would have us expect. 674 * Trim mbufs if longer than we expect. 675 * Drop packet if shorter than we expect. 676 */ 677 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 678 IP6_STATINC(IP6_STAT_TOOSHORT); 679 in6_ifstat_inc(rcvif, ifs6_in_truncated); 680 goto bad_unref; 681 } 682 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 683 if (m->m_len == m->m_pkthdr.len) { 684 m->m_len = sizeof(struct ip6_hdr) + plen; 685 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 686 } else 687 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 688 } 689 690 /* 691 * Forward if desirable. 692 */ 693 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 694 /* 695 * If we are acting as a multicast router, all 696 * incoming multicast packets are passed to the 697 * kernel-level multicast forwarding function. 698 * The packet is returned (relatively) intact; if 699 * ip6_mforward() returns a non-zero value, the packet 700 * must be discarded, else it may be accepted below. 701 */ 702 if (ip6_mrouter != NULL) { 703 int error; 704 705 SOFTNET_LOCK(); 706 error = ip6_mforward(ip6, rcvif, m); 707 SOFTNET_UNLOCK(); 708 709 if (error != 0) { 710 rtcache_unref(rt, ro); 711 percpu_putref(ip6_forward_rt_percpu); 712 IP6_STATINC(IP6_STAT_CANTFORWARD); 713 goto bad; 714 } 715 } 716 if (!ours) 717 goto bad_unref; 718 } else if (!ours) { 719 rtcache_unref(rt, ro); 720 percpu_putref(ip6_forward_rt_percpu); 721 ip6_forward(m, srcrt); 722 return; 723 } 724 725 ip6 = mtod(m, struct ip6_hdr *); 726 727 /* 728 * Malicious party may be able to use IPv4 mapped addr to confuse 729 * tcp/udp stack and bypass security checks (act as if it was from 730 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious. 731 * 732 * For SIIT end node behavior, you may want to disable the check. 733 * However, you will become vulnerable to attacks using IPv4 mapped 734 * source. 735 */ 736 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 737 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 738 IP6_STATINC(IP6_STAT_BADSCOPE); 739 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 740 goto bad_unref; 741 } 742 743 /* 744 * Tell launch routine the next header 745 */ 746 #ifdef IFA_STATS 747 if (deliverifp != NULL) { 748 struct in6_ifaddr *ia6; 749 int s = pserialize_read_enter(); 750 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 751 if (ia6) 752 ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len; 753 pserialize_read_exit(s); 754 } 755 #endif 756 IP6_STATINC(IP6_STAT_DELIVERED); 757 in6_ifstat_inc(deliverifp, ifs6_in_deliver); 758 nest = 0; 759 760 if (rt != NULL) { 761 rtcache_unref(rt, ro); 762 rt = NULL; 763 } 764 percpu_putref(ip6_forward_rt_percpu); 765 766 rh_present = 0; 767 while (nxt != IPPROTO_DONE) { 768 if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) { 769 IP6_STATINC(IP6_STAT_TOOMANYHDR); 770 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 771 goto bad; 772 } 773 774 /* 775 * protection against faulty packet - there should be 776 * more sanity checks in header chain processing. 777 */ 778 if (m->m_pkthdr.len < off) { 779 IP6_STATINC(IP6_STAT_TOOSHORT); 780 in6_ifstat_inc(rcvif, ifs6_in_truncated); 781 goto bad; 782 } 783 784 if (nxt == IPPROTO_ROUTING) { 785 if (rh_present++) { 786 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 787 IP6_STATINC(IP6_STAT_BADOPTIONS); 788 goto bad; 789 } 790 } 791 792 #ifdef IPSEC 793 if (ipsec_used) { 794 /* 795 * enforce IPsec policy checking if we are seeing last 796 * header. note that we do not visit this with 797 * protocols with pcb layer code - like udp/tcp/raw ip. 798 */ 799 if ((inet6sw[ip_protox[nxt]].pr_flags 800 & PR_LASTHDR) != 0) { 801 int error; 802 803 SOFTNET_LOCK(); 804 error = ipsec6_input(m); 805 SOFTNET_UNLOCK(); 806 if (error) 807 goto bad; 808 } 809 } 810 #endif /* IPSEC */ 811 812 SOFTNET_LOCK(); 813 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt); 814 SOFTNET_UNLOCK(); 815 } 816 return; 817 818 bad_unref: 819 rtcache_unref(rt, ro); 820 percpu_putref(ip6_forward_rt_percpu); 821 bad: 822 m_freem(m); 823 return; 824 } 825 826 /* 827 * set/grab in6_ifaddr correspond to IPv6 destination address. 828 */ 829 static struct m_tag * 830 ip6_setdstifaddr(struct mbuf *m, const struct in6_ifaddr *ia) 831 { 832 struct m_tag *mtag; 833 struct ip6aux *ip6a; 834 835 mtag = ip6_addaux(m); 836 if (mtag == NULL) 837 return NULL; 838 839 ip6a = (struct ip6aux *)(mtag + 1); 840 if (in6_setscope(&ip6a->ip6a_src, ia->ia_ifp, &ip6a->ip6a_scope_id)) { 841 IP6_STATINC(IP6_STAT_BADSCOPE); 842 return NULL; 843 } 844 845 ip6a->ip6a_src = ia->ia_addr.sin6_addr; 846 ip6a->ip6a_flags = ia->ia6_flags; 847 return mtag; 848 } 849 850 const struct ip6aux * 851 ip6_getdstifaddr(struct mbuf *m) 852 { 853 struct m_tag *mtag; 854 855 mtag = ip6_findaux(m); 856 if (mtag != NULL) 857 return (struct ip6aux *)(mtag + 1); 858 else 859 return NULL; 860 } 861 862 /* 863 * Hop-by-Hop options header processing. If a valid jumbo payload option is 864 * included, the real payload length will be stored in plenp. 865 * 866 * rtalertp - XXX: should be stored more smart way 867 */ 868 int 869 ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp, 870 struct mbuf **mp, int *offp) 871 { 872 struct mbuf *m = *mp; 873 int off = *offp, hbhlen; 874 struct ip6_hbh *hbh; 875 876 /* validation of the length of the header */ 877 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, 878 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh)); 879 if (hbh == NULL) { 880 IP6_STATINC(IP6_STAT_TOOSHORT); 881 return -1; 882 } 883 hbhlen = (hbh->ip6h_len + 1) << 3; 884 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 885 hbhlen); 886 if (hbh == NULL) { 887 IP6_STATINC(IP6_STAT_TOOSHORT); 888 return -1; 889 } 890 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 891 off += hbhlen; 892 hbhlen -= sizeof(struct ip6_hbh); 893 894 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 895 hbhlen, rtalertp, plenp) < 0) 896 return (-1); 897 898 *offp = off; 899 *mp = m; 900 return (0); 901 } 902 903 /* 904 * Search header for all Hop-by-hop options and process each option. 905 * This function is separate from ip6_hopopts_input() in order to 906 * handle a case where the sending node itself process its hop-by-hop 907 * options header. In such a case, the function is called from ip6_output(). 908 * 909 * The function assumes that hbh header is located right after the IPv6 header 910 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to 911 * opthead + hbhlen is located in continuous memory region. 912 */ 913 static int 914 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen, 915 u_int32_t *rtalertp, u_int32_t *plenp) 916 { 917 struct ip6_hdr *ip6; 918 int optlen = 0; 919 u_int8_t *opt = opthead; 920 u_int16_t rtalert_val; 921 u_int32_t jumboplen; 922 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh); 923 924 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 925 switch (*opt) { 926 case IP6OPT_PAD1: 927 optlen = 1; 928 break; 929 case IP6OPT_PADN: 930 if (hbhlen < IP6OPT_MINLEN) { 931 IP6_STATINC(IP6_STAT_TOOSMALL); 932 goto bad; 933 } 934 optlen = *(opt + 1) + 2; 935 break; 936 case IP6OPT_RTALERT: 937 /* XXX may need check for alignment */ 938 if (hbhlen < IP6OPT_RTALERT_LEN) { 939 IP6_STATINC(IP6_STAT_TOOSMALL); 940 goto bad; 941 } 942 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) { 943 /* XXX stat */ 944 icmp6_error(m, ICMP6_PARAM_PROB, 945 ICMP6_PARAMPROB_HEADER, 946 erroff + opt + 1 - opthead); 947 return (-1); 948 } 949 optlen = IP6OPT_RTALERT_LEN; 950 memcpy((void *)&rtalert_val, (void *)(opt + 2), 2); 951 *rtalertp = ntohs(rtalert_val); 952 break; 953 case IP6OPT_JUMBO: 954 /* XXX may need check for alignment */ 955 if (hbhlen < IP6OPT_JUMBO_LEN) { 956 IP6_STATINC(IP6_STAT_TOOSMALL); 957 goto bad; 958 } 959 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) { 960 /* XXX stat */ 961 icmp6_error(m, ICMP6_PARAM_PROB, 962 ICMP6_PARAMPROB_HEADER, 963 erroff + opt + 1 - opthead); 964 return (-1); 965 } 966 optlen = IP6OPT_JUMBO_LEN; 967 968 /* 969 * IPv6 packets that have non 0 payload length 970 * must not contain a jumbo payload option. 971 */ 972 ip6 = mtod(m, struct ip6_hdr *); 973 if (ip6->ip6_plen) { 974 IP6_STATINC(IP6_STAT_BADOPTIONS); 975 icmp6_error(m, ICMP6_PARAM_PROB, 976 ICMP6_PARAMPROB_HEADER, 977 erroff + opt - opthead); 978 return (-1); 979 } 980 981 /* 982 * We may see jumbolen in unaligned location, so 983 * we'd need to perform bcopy(). 984 */ 985 memcpy(&jumboplen, opt + 2, sizeof(jumboplen)); 986 jumboplen = (u_int32_t)htonl(jumboplen); 987 988 #if 1 989 /* 990 * if there are multiple jumbo payload options, 991 * *plenp will be non-zero and the packet will be 992 * rejected. 993 * the behavior may need some debate in ipngwg - 994 * multiple options does not make sense, however, 995 * there's no explicit mention in specification. 996 */ 997 if (*plenp != 0) { 998 IP6_STATINC(IP6_STAT_BADOPTIONS); 999 icmp6_error(m, ICMP6_PARAM_PROB, 1000 ICMP6_PARAMPROB_HEADER, 1001 erroff + opt + 2 - opthead); 1002 return (-1); 1003 } 1004 #endif 1005 1006 /* 1007 * jumbo payload length must be larger than 65535. 1008 */ 1009 if (jumboplen <= IPV6_MAXPACKET) { 1010 IP6_STATINC(IP6_STAT_BADOPTIONS); 1011 icmp6_error(m, ICMP6_PARAM_PROB, 1012 ICMP6_PARAMPROB_HEADER, 1013 erroff + opt + 2 - opthead); 1014 return (-1); 1015 } 1016 *plenp = jumboplen; 1017 1018 break; 1019 default: /* unknown option */ 1020 if (hbhlen < IP6OPT_MINLEN) { 1021 IP6_STATINC(IP6_STAT_TOOSMALL); 1022 goto bad; 1023 } 1024 optlen = ip6_unknown_opt(opt, m, 1025 erroff + opt - opthead); 1026 if (optlen == -1) 1027 return (-1); 1028 optlen += 2; 1029 break; 1030 } 1031 } 1032 1033 return (0); 1034 1035 bad: 1036 m_freem(m); 1037 return (-1); 1038 } 1039 1040 /* 1041 * Unknown option processing. 1042 * The third argument `off' is the offset from the IPv6 header to the option, 1043 * which is necessary if the IPv6 header the and option header and IPv6 header 1044 * is not continuous in order to return an ICMPv6 error. 1045 */ 1046 int 1047 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off) 1048 { 1049 struct ip6_hdr *ip6; 1050 1051 switch (IP6OPT_TYPE(*optp)) { 1052 case IP6OPT_TYPE_SKIP: /* ignore the option */ 1053 return ((int)*(optp + 1)); 1054 case IP6OPT_TYPE_DISCARD: /* silently discard */ 1055 m_freem(m); 1056 return (-1); 1057 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 1058 IP6_STATINC(IP6_STAT_BADOPTIONS); 1059 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 1060 return (-1); 1061 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 1062 IP6_STATINC(IP6_STAT_BADOPTIONS); 1063 ip6 = mtod(m, struct ip6_hdr *); 1064 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 1065 (m->m_flags & (M_BCAST|M_MCAST))) 1066 m_freem(m); 1067 else 1068 icmp6_error(m, ICMP6_PARAM_PROB, 1069 ICMP6_PARAMPROB_OPTION, off); 1070 return (-1); 1071 } 1072 1073 m_freem(m); /* XXX: NOTREACHED */ 1074 return (-1); 1075 } 1076 1077 /* 1078 * Create the "control" list for this pcb. 1079 * 1080 * The routine will be called from upper layer handlers like tcp6_input(). 1081 * Thus the routine assumes that the caller (tcp6_input) have already 1082 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the 1083 * very first mbuf on the mbuf chain. 1084 * We may want to add some infinite loop prevention or sanity checks for safety. 1085 * (This applies only when you are using KAME mbuf chain restriction, i.e. 1086 * you are using IP6_EXTHDR_CHECK() not m_pulldown()) 1087 */ 1088 void 1089 ip6_savecontrol(struct in6pcb *in6p, struct mbuf **mp, 1090 struct ip6_hdr *ip6, struct mbuf *m) 1091 { 1092 #ifdef RFC2292 1093 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y)) 1094 #else 1095 #define IS2292(x, y) (y) 1096 #endif 1097 1098 if (in6p->in6p_socket->so_options & SO_TIMESTAMP 1099 #ifdef SO_OTIMESTAMP 1100 || in6p->in6p_socket->so_options & SO_OTIMESTAMP 1101 #endif 1102 ) { 1103 struct timeval tv; 1104 1105 microtime(&tv); 1106 #ifdef SO_OTIMESTAMP 1107 if (in6p->in6p_socket->so_options & SO_OTIMESTAMP) { 1108 struct timeval50 tv50; 1109 timeval_to_timeval50(&tv, &tv50); 1110 *mp = sbcreatecontrol((void *) &tv50, sizeof(tv50), 1111 SCM_OTIMESTAMP, SOL_SOCKET); 1112 } else 1113 #endif 1114 *mp = sbcreatecontrol((void *) &tv, sizeof(tv), 1115 SCM_TIMESTAMP, SOL_SOCKET); 1116 if (*mp) 1117 mp = &(*mp)->m_next; 1118 } 1119 1120 /* some OSes call this logic with IPv4 packet, for SO_TIMESTAMP */ 1121 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) 1122 return; 1123 1124 /* RFC 2292 sec. 5 */ 1125 if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) { 1126 struct in6_pktinfo pi6; 1127 1128 memcpy(&pi6.ipi6_addr, &ip6->ip6_dst, sizeof(struct in6_addr)); 1129 in6_clearscope(&pi6.ipi6_addr); /* XXX */ 1130 pi6.ipi6_ifindex = m->m_pkthdr.rcvif_index; 1131 *mp = sbcreatecontrol((void *) &pi6, 1132 sizeof(struct in6_pktinfo), 1133 IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6); 1134 if (*mp) 1135 mp = &(*mp)->m_next; 1136 } 1137 1138 if (in6p->in6p_flags & IN6P_HOPLIMIT) { 1139 int hlim = ip6->ip6_hlim & 0xff; 1140 1141 *mp = sbcreatecontrol((void *) &hlim, sizeof(int), 1142 IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6); 1143 if (*mp) 1144 mp = &(*mp)->m_next; 1145 } 1146 1147 if ((in6p->in6p_flags & IN6P_TCLASS) != 0) { 1148 u_int32_t flowinfo; 1149 int tclass; 1150 1151 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK); 1152 flowinfo >>= 20; 1153 1154 tclass = flowinfo & 0xff; 1155 *mp = sbcreatecontrol((void *)&tclass, sizeof(tclass), 1156 IPV6_TCLASS, IPPROTO_IPV6); 1157 1158 if (*mp) 1159 mp = &(*mp)->m_next; 1160 } 1161 1162 /* 1163 * IPV6_HOPOPTS socket option. Recall that we required super-user 1164 * privilege for the option (see ip6_ctloutput), but it might be too 1165 * strict, since there might be some hop-by-hop options which can be 1166 * returned to normal user. 1167 * See also RFC3542 section 8 (or RFC2292 section 6). 1168 */ 1169 if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0) { 1170 /* 1171 * Check if a hop-by-hop options header is contatined in the 1172 * received packet, and if so, store the options as ancillary 1173 * data. Note that a hop-by-hop options header must be 1174 * just after the IPv6 header, which fact is assured through 1175 * the IPv6 input processing. 1176 */ 1177 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1178 if (xip6->ip6_nxt == IPPROTO_HOPOPTS) { 1179 struct ip6_hbh *hbh; 1180 int hbhlen; 1181 struct mbuf *ext; 1182 1183 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr), 1184 xip6->ip6_nxt); 1185 if (ext == NULL) { 1186 IP6_STATINC(IP6_STAT_TOOSHORT); 1187 return; 1188 } 1189 hbh = mtod(ext, struct ip6_hbh *); 1190 hbhlen = (hbh->ip6h_len + 1) << 3; 1191 if (hbhlen != ext->m_len) { 1192 m_freem(ext); 1193 IP6_STATINC(IP6_STAT_TOOSHORT); 1194 return; 1195 } 1196 1197 /* 1198 * XXX: We copy whole the header even if a jumbo 1199 * payload option is included, which option is to 1200 * be removed before returning in the RFC 2292. 1201 * Note: this constraint is removed in RFC3542. 1202 */ 1203 *mp = sbcreatecontrol((void *)hbh, hbhlen, 1204 IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS), 1205 IPPROTO_IPV6); 1206 if (*mp) 1207 mp = &(*mp)->m_next; 1208 m_freem(ext); 1209 } 1210 } 1211 1212 /* IPV6_DSTOPTS and IPV6_RTHDR socket options */ 1213 if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) { 1214 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1215 int nxt = xip6->ip6_nxt, off = sizeof(struct ip6_hdr); 1216 1217 /* 1218 * Search for destination options headers or routing 1219 * header(s) through the header chain, and stores each 1220 * header as ancillary data. 1221 * Note that the order of the headers remains in 1222 * the chain of ancillary data. 1223 */ 1224 for (;;) { /* is explicit loop prevention necessary? */ 1225 struct ip6_ext *ip6e = NULL; 1226 int elen; 1227 struct mbuf *ext = NULL; 1228 1229 /* 1230 * if it is not an extension header, don't try to 1231 * pull it from the chain. 1232 */ 1233 switch (nxt) { 1234 case IPPROTO_DSTOPTS: 1235 case IPPROTO_ROUTING: 1236 case IPPROTO_HOPOPTS: 1237 case IPPROTO_AH: /* is it possible? */ 1238 break; 1239 default: 1240 goto loopend; 1241 } 1242 1243 ext = ip6_pullexthdr(m, off, nxt); 1244 if (ext == NULL) { 1245 IP6_STATINC(IP6_STAT_TOOSHORT); 1246 return; 1247 } 1248 ip6e = mtod(ext, struct ip6_ext *); 1249 if (nxt == IPPROTO_AH) 1250 elen = (ip6e->ip6e_len + 2) << 2; 1251 else 1252 elen = (ip6e->ip6e_len + 1) << 3; 1253 if (elen != ext->m_len) { 1254 m_freem(ext); 1255 IP6_STATINC(IP6_STAT_TOOSHORT); 1256 return; 1257 } 1258 KASSERT(IP6_HDR_ALIGNED_P(ip6e)); 1259 1260 switch (nxt) { 1261 case IPPROTO_DSTOPTS: 1262 if (!(in6p->in6p_flags & IN6P_DSTOPTS)) 1263 break; 1264 1265 *mp = sbcreatecontrol((void *)ip6e, elen, 1266 IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS), 1267 IPPROTO_IPV6); 1268 if (*mp) 1269 mp = &(*mp)->m_next; 1270 break; 1271 1272 case IPPROTO_ROUTING: 1273 if (!(in6p->in6p_flags & IN6P_RTHDR)) 1274 break; 1275 1276 *mp = sbcreatecontrol((void *)ip6e, elen, 1277 IS2292(IPV6_2292RTHDR, IPV6_RTHDR), 1278 IPPROTO_IPV6); 1279 if (*mp) 1280 mp = &(*mp)->m_next; 1281 break; 1282 1283 case IPPROTO_HOPOPTS: 1284 case IPPROTO_AH: /* is it possible? */ 1285 break; 1286 1287 default: 1288 /* 1289 * other cases have been filtered in the above. 1290 * none will visit this case. here we supply 1291 * the code just in case (nxt overwritten or 1292 * other cases). 1293 */ 1294 m_freem(ext); 1295 goto loopend; 1296 1297 } 1298 1299 /* proceed with the next header. */ 1300 off += elen; 1301 nxt = ip6e->ip6e_nxt; 1302 ip6e = NULL; 1303 m_freem(ext); 1304 ext = NULL; 1305 } 1306 loopend: 1307 ; 1308 } 1309 } 1310 #undef IS2292 1311 1312 1313 void 1314 ip6_notify_pmtu(struct in6pcb *in6p, const struct sockaddr_in6 *dst, 1315 uint32_t *mtu) 1316 { 1317 struct socket *so; 1318 struct mbuf *m_mtu; 1319 struct ip6_mtuinfo mtuctl; 1320 1321 so = in6p->in6p_socket; 1322 1323 if (mtu == NULL) 1324 return; 1325 1326 #ifdef DIAGNOSTIC 1327 if (so == NULL) /* I believe this is impossible */ 1328 panic("ip6_notify_pmtu: socket is NULL"); 1329 #endif 1330 1331 memset(&mtuctl, 0, sizeof(mtuctl)); /* zero-clear for safety */ 1332 mtuctl.ip6m_mtu = *mtu; 1333 mtuctl.ip6m_addr = *dst; 1334 if (sa6_recoverscope(&mtuctl.ip6m_addr)) 1335 return; 1336 1337 if ((m_mtu = sbcreatecontrol((void *)&mtuctl, sizeof(mtuctl), 1338 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL) 1339 return; 1340 1341 if (sbappendaddr(&so->so_rcv, (const struct sockaddr *)dst, NULL, m_mtu) 1342 == 0) { 1343 m_freem(m_mtu); 1344 /* XXX: should count statistics */ 1345 } else 1346 sorwakeup(so); 1347 1348 return; 1349 } 1350 1351 /* 1352 * pull single extension header from mbuf chain. returns single mbuf that 1353 * contains the result, or NULL on error. 1354 */ 1355 static struct mbuf * 1356 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt) 1357 { 1358 struct ip6_ext ip6e; 1359 size_t elen; 1360 struct mbuf *n; 1361 1362 #ifdef DIAGNOSTIC 1363 switch (nxt) { 1364 case IPPROTO_DSTOPTS: 1365 case IPPROTO_ROUTING: 1366 case IPPROTO_HOPOPTS: 1367 case IPPROTO_AH: /* is it possible? */ 1368 break; 1369 default: 1370 printf("ip6_pullexthdr: invalid nxt=%d\n", nxt); 1371 } 1372 #endif 1373 1374 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1375 if (nxt == IPPROTO_AH) 1376 elen = (ip6e.ip6e_len + 2) << 2; 1377 else 1378 elen = (ip6e.ip6e_len + 1) << 3; 1379 1380 MGET(n, M_DONTWAIT, MT_DATA); 1381 if (n && elen >= MLEN) { 1382 MCLGET(n, M_DONTWAIT); 1383 if ((n->m_flags & M_EXT) == 0) { 1384 m_free(n); 1385 n = NULL; 1386 } 1387 } 1388 if (!n) 1389 return NULL; 1390 1391 n->m_len = 0; 1392 if (elen >= M_TRAILINGSPACE(n)) { 1393 m_free(n); 1394 return NULL; 1395 } 1396 1397 m_copydata(m, off, elen, mtod(n, void *)); 1398 n->m_len = elen; 1399 return n; 1400 } 1401 1402 /* 1403 * Get pointer to the previous header followed by the header 1404 * currently processed. 1405 * XXX: This function supposes that 1406 * M includes all headers, 1407 * the next header field and the header length field of each header 1408 * are valid, and 1409 * the sum of each header length equals to OFF. 1410 * Because of these assumptions, this function must be called very 1411 * carefully. Moreover, it will not be used in the near future when 1412 * we develop `neater' mechanism to process extension headers. 1413 */ 1414 u_int8_t * 1415 ip6_get_prevhdr(struct mbuf *m, int off) 1416 { 1417 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1418 1419 if (off == sizeof(struct ip6_hdr)) 1420 return (&ip6->ip6_nxt); 1421 else { 1422 int len, nxt; 1423 struct ip6_ext *ip6e = NULL; 1424 1425 nxt = ip6->ip6_nxt; 1426 len = sizeof(struct ip6_hdr); 1427 while (len < off) { 1428 ip6e = (struct ip6_ext *)(mtod(m, char *) + len); 1429 1430 switch (nxt) { 1431 case IPPROTO_FRAGMENT: 1432 len += sizeof(struct ip6_frag); 1433 break; 1434 case IPPROTO_AH: 1435 len += (ip6e->ip6e_len + 2) << 2; 1436 break; 1437 default: 1438 len += (ip6e->ip6e_len + 1) << 3; 1439 break; 1440 } 1441 nxt = ip6e->ip6e_nxt; 1442 } 1443 if (ip6e) 1444 return (&ip6e->ip6e_nxt); 1445 else 1446 return NULL; 1447 } 1448 } 1449 1450 /* 1451 * get next header offset. m will be retained. 1452 */ 1453 int 1454 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp) 1455 { 1456 struct ip6_hdr ip6; 1457 struct ip6_ext ip6e; 1458 struct ip6_frag fh; 1459 1460 /* just in case */ 1461 if (m == NULL) 1462 panic("ip6_nexthdr: m == NULL"); 1463 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off) 1464 return -1; 1465 1466 switch (proto) { 1467 case IPPROTO_IPV6: 1468 /* do not chase beyond intermediate IPv6 headers */ 1469 if (off != 0) 1470 return -1; 1471 if (m->m_pkthdr.len < off + sizeof(ip6)) 1472 return -1; 1473 m_copydata(m, off, sizeof(ip6), (void *)&ip6); 1474 if (nxtp) 1475 *nxtp = ip6.ip6_nxt; 1476 off += sizeof(ip6); 1477 return off; 1478 1479 case IPPROTO_FRAGMENT: 1480 /* 1481 * terminate parsing if it is not the first fragment, 1482 * it does not make sense to parse through it. 1483 */ 1484 if (m->m_pkthdr.len < off + sizeof(fh)) 1485 return -1; 1486 m_copydata(m, off, sizeof(fh), (void *)&fh); 1487 if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0) 1488 return -1; 1489 if (nxtp) 1490 *nxtp = fh.ip6f_nxt; 1491 off += sizeof(struct ip6_frag); 1492 return off; 1493 1494 case IPPROTO_AH: 1495 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1496 return -1; 1497 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1498 if (nxtp) 1499 *nxtp = ip6e.ip6e_nxt; 1500 off += (ip6e.ip6e_len + 2) << 2; 1501 if (m->m_pkthdr.len < off) 1502 return -1; 1503 return off; 1504 1505 case IPPROTO_HOPOPTS: 1506 case IPPROTO_ROUTING: 1507 case IPPROTO_DSTOPTS: 1508 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1509 return -1; 1510 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1511 if (nxtp) 1512 *nxtp = ip6e.ip6e_nxt; 1513 off += (ip6e.ip6e_len + 1) << 3; 1514 if (m->m_pkthdr.len < off) 1515 return -1; 1516 return off; 1517 1518 case IPPROTO_NONE: 1519 case IPPROTO_ESP: 1520 case IPPROTO_IPCOMP: 1521 /* give up */ 1522 return -1; 1523 1524 default: 1525 return -1; 1526 } 1527 } 1528 1529 /* 1530 * get offset for the last header in the chain. m will be kept untainted. 1531 */ 1532 int 1533 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp) 1534 { 1535 int newoff; 1536 int nxt; 1537 1538 if (!nxtp) { 1539 nxt = -1; 1540 nxtp = &nxt; 1541 } 1542 for (;;) { 1543 newoff = ip6_nexthdr(m, off, proto, nxtp); 1544 if (newoff < 0) 1545 return off; 1546 else if (newoff < off) 1547 return -1; /* invalid */ 1548 else if (newoff == off) 1549 return newoff; 1550 1551 off = newoff; 1552 proto = *nxtp; 1553 } 1554 } 1555 1556 struct m_tag * 1557 ip6_addaux(struct mbuf *m) 1558 { 1559 struct m_tag *mtag; 1560 1561 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1562 if (!mtag) { 1563 mtag = m_tag_get(PACKET_TAG_INET6, sizeof(struct ip6aux), 1564 M_NOWAIT); 1565 if (mtag) { 1566 m_tag_prepend(m, mtag); 1567 memset(mtag + 1, 0, sizeof(struct ip6aux)); 1568 } 1569 } 1570 return mtag; 1571 } 1572 1573 struct m_tag * 1574 ip6_findaux(struct mbuf *m) 1575 { 1576 struct m_tag *mtag; 1577 1578 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1579 return mtag; 1580 } 1581 1582 void 1583 ip6_delaux(struct mbuf *m) 1584 { 1585 struct m_tag *mtag; 1586 1587 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1588 if (mtag) 1589 m_tag_delete(m, mtag); 1590 } 1591 1592 /* 1593 * System control for IP6 1594 */ 1595 1596 const u_char inet6ctlerrmap[PRC_NCMDS] = { 1597 0, 0, 0, 0, 1598 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 1599 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 1600 EMSGSIZE, EHOSTUNREACH, 0, 0, 1601 0, 0, 0, 0, 1602 ENOPROTOOPT 1603 }; 1604 1605 extern int sysctl_net_inet6_addrctlpolicy(SYSCTLFN_ARGS); 1606 1607 static int 1608 sysctl_net_inet6_ip6_stats(SYSCTLFN_ARGS) 1609 { 1610 1611 return (NETSTAT_SYSCTL(ip6stat_percpu, IP6_NSTATS)); 1612 } 1613 1614 static void 1615 sysctl_net_inet6_ip6_setup(struct sysctllog **clog) 1616 { 1617 #ifdef RFC2292 1618 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y)) 1619 #else 1620 #define IS2292(x, y) (y) 1621 #endif 1622 1623 sysctl_createv(clog, 0, NULL, NULL, 1624 CTLFLAG_PERMANENT, 1625 CTLTYPE_NODE, "inet6", 1626 SYSCTL_DESCR("PF_INET6 related settings"), 1627 NULL, 0, NULL, 0, 1628 CTL_NET, PF_INET6, CTL_EOL); 1629 sysctl_createv(clog, 0, NULL, NULL, 1630 CTLFLAG_PERMANENT, 1631 CTLTYPE_NODE, "ip6", 1632 SYSCTL_DESCR("IPv6 related settings"), 1633 NULL, 0, NULL, 0, 1634 CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_EOL); 1635 1636 sysctl_createv(clog, 0, NULL, NULL, 1637 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1638 CTLTYPE_INT, "forwarding", 1639 SYSCTL_DESCR("Enable forwarding of INET6 datagrams"), 1640 NULL, 0, &ip6_forwarding, 0, 1641 CTL_NET, PF_INET6, IPPROTO_IPV6, 1642 IPV6CTL_FORWARDING, CTL_EOL); 1643 sysctl_createv(clog, 0, NULL, NULL, 1644 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1645 CTLTYPE_INT, "redirect", 1646 SYSCTL_DESCR("Enable sending of ICMPv6 redirect messages"), 1647 NULL, 0, &ip6_sendredirects, 0, 1648 CTL_NET, PF_INET6, IPPROTO_IPV6, 1649 IPV6CTL_SENDREDIRECTS, CTL_EOL); 1650 sysctl_createv(clog, 0, NULL, NULL, 1651 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1652 CTLTYPE_INT, "hlim", 1653 SYSCTL_DESCR("Hop limit for an INET6 datagram"), 1654 NULL, 0, &ip6_defhlim, 0, 1655 CTL_NET, PF_INET6, IPPROTO_IPV6, 1656 IPV6CTL_DEFHLIM, CTL_EOL); 1657 #ifdef notyet 1658 sysctl_createv(clog, 0, NULL, NULL, 1659 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1660 CTLTYPE_INT, "mtu", NULL, 1661 NULL, 0, &, 0, 1662 CTL_NET, PF_INET6, IPPROTO_IPV6, 1663 IPV6CTL_DEFMTU, CTL_EOL); 1664 #endif 1665 #ifdef __no_idea__ 1666 sysctl_createv(clog, 0, NULL, NULL, 1667 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1668 CTLTYPE_INT, "forwsrcrt", NULL, 1669 NULL, 0, &?, 0, 1670 CTL_NET, PF_INET6, IPPROTO_IPV6, 1671 IPV6CTL_FORWSRCRT, CTL_EOL); 1672 sysctl_createv(clog, 0, NULL, NULL, 1673 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1674 CTLTYPE_STRUCT, "mrtstats", NULL, 1675 NULL, 0, &?, sizeof(?), 1676 CTL_NET, PF_INET6, IPPROTO_IPV6, 1677 IPV6CTL_MRTSTATS, CTL_EOL); 1678 sysctl_createv(clog, 0, NULL, NULL, 1679 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1680 CTLTYPE_?, "mrtproto", NULL, 1681 NULL, 0, &?, sizeof(?), 1682 CTL_NET, PF_INET6, IPPROTO_IPV6, 1683 IPV6CTL_MRTPROTO, CTL_EOL); 1684 #endif 1685 sysctl_createv(clog, 0, NULL, NULL, 1686 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1687 CTLTYPE_INT, "maxfragpackets", 1688 SYSCTL_DESCR("Maximum number of fragments to buffer " 1689 "for reassembly"), 1690 NULL, 0, &ip6_maxfragpackets, 0, 1691 CTL_NET, PF_INET6, IPPROTO_IPV6, 1692 IPV6CTL_MAXFRAGPACKETS, CTL_EOL); 1693 #ifdef __no_idea__ 1694 sysctl_createv(clog, 0, NULL, NULL, 1695 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1696 CTLTYPE_INT, "sourcecheck", NULL, 1697 NULL, 0, &?, 0, 1698 CTL_NET, PF_INET6, IPPROTO_IPV6, 1699 IPV6CTL_SOURCECHECK, CTL_EOL); 1700 sysctl_createv(clog, 0, NULL, NULL, 1701 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1702 CTLTYPE_INT, "sourcecheck_logint", NULL, 1703 NULL, 0, &?, 0, 1704 CTL_NET, PF_INET6, IPPROTO_IPV6, 1705 IPV6CTL_SOURCECHECK_LOGINT, CTL_EOL); 1706 #endif 1707 sysctl_createv(clog, 0, NULL, NULL, 1708 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1709 CTLTYPE_INT, "accept_rtadv", 1710 SYSCTL_DESCR("Accept router advertisements"), 1711 NULL, 0, &ip6_accept_rtadv, 0, 1712 CTL_NET, PF_INET6, IPPROTO_IPV6, 1713 IPV6CTL_ACCEPT_RTADV, CTL_EOL); 1714 sysctl_createv(clog, 0, NULL, NULL, 1715 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1716 CTLTYPE_INT, "rtadv_maxroutes", 1717 SYSCTL_DESCR("Maximum number of routes accepted via router advertisements"), 1718 NULL, 0, &ip6_rtadv_maxroutes, 0, 1719 CTL_NET, PF_INET6, IPPROTO_IPV6, 1720 IPV6CTL_RTADV_MAXROUTES, CTL_EOL); 1721 sysctl_createv(clog, 0, NULL, NULL, 1722 CTLFLAG_PERMANENT, 1723 CTLTYPE_INT, "rtadv_numroutes", 1724 SYSCTL_DESCR("Current number of routes accepted via router advertisements"), 1725 NULL, 0, &nd6_numroutes, 0, 1726 CTL_NET, PF_INET6, IPPROTO_IPV6, 1727 IPV6CTL_RTADV_NUMROUTES, CTL_EOL); 1728 sysctl_createv(clog, 0, NULL, NULL, 1729 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1730 CTLTYPE_INT, "keepfaith", 1731 SYSCTL_DESCR("Activate faith interface"), 1732 NULL, 0, &ip6_keepfaith, 0, 1733 CTL_NET, PF_INET6, IPPROTO_IPV6, 1734 IPV6CTL_KEEPFAITH, CTL_EOL); 1735 sysctl_createv(clog, 0, NULL, NULL, 1736 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1737 CTLTYPE_INT, "log_interval", 1738 SYSCTL_DESCR("Minumum interval between logging " 1739 "unroutable packets"), 1740 NULL, 0, &ip6_log_interval, 0, 1741 CTL_NET, PF_INET6, IPPROTO_IPV6, 1742 IPV6CTL_LOG_INTERVAL, CTL_EOL); 1743 sysctl_createv(clog, 0, NULL, NULL, 1744 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1745 CTLTYPE_INT, "hdrnestlimit", 1746 SYSCTL_DESCR("Maximum number of nested IPv6 headers"), 1747 NULL, 0, &ip6_hdrnestlimit, 0, 1748 CTL_NET, PF_INET6, IPPROTO_IPV6, 1749 IPV6CTL_HDRNESTLIMIT, CTL_EOL); 1750 sysctl_createv(clog, 0, NULL, NULL, 1751 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1752 CTLTYPE_INT, "dad_count", 1753 SYSCTL_DESCR("Number of Duplicate Address Detection " 1754 "probes to send"), 1755 NULL, 0, &ip6_dad_count, 0, 1756 CTL_NET, PF_INET6, IPPROTO_IPV6, 1757 IPV6CTL_DAD_COUNT, CTL_EOL); 1758 sysctl_createv(clog, 0, NULL, NULL, 1759 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1760 CTLTYPE_INT, "auto_flowlabel", 1761 SYSCTL_DESCR("Assign random IPv6 flow labels"), 1762 NULL, 0, &ip6_auto_flowlabel, 0, 1763 CTL_NET, PF_INET6, IPPROTO_IPV6, 1764 IPV6CTL_AUTO_FLOWLABEL, CTL_EOL); 1765 sysctl_createv(clog, 0, NULL, NULL, 1766 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1767 CTLTYPE_INT, "defmcasthlim", 1768 SYSCTL_DESCR("Default multicast hop limit"), 1769 NULL, 0, &ip6_defmcasthlim, 0, 1770 CTL_NET, PF_INET6, IPPROTO_IPV6, 1771 IPV6CTL_DEFMCASTHLIM, CTL_EOL); 1772 sysctl_createv(clog, 0, NULL, NULL, 1773 CTLFLAG_PERMANENT, 1774 CTLTYPE_STRING, "kame_version", 1775 SYSCTL_DESCR("KAME Version"), 1776 NULL, 0, __UNCONST(__KAME_VERSION), 0, 1777 CTL_NET, PF_INET6, IPPROTO_IPV6, 1778 IPV6CTL_KAME_VERSION, CTL_EOL); 1779 sysctl_createv(clog, 0, NULL, NULL, 1780 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1781 CTLTYPE_INT, "use_deprecated", 1782 SYSCTL_DESCR("Allow use of deprecated addresses as " 1783 "source addresses"), 1784 NULL, 0, &ip6_use_deprecated, 0, 1785 CTL_NET, PF_INET6, IPPROTO_IPV6, 1786 IPV6CTL_USE_DEPRECATED, CTL_EOL); 1787 sysctl_createv(clog, 0, NULL, NULL, 1788 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1789 CTLTYPE_INT, "rr_prune", NULL, 1790 NULL, 0, &ip6_rr_prune, 0, 1791 CTL_NET, PF_INET6, IPPROTO_IPV6, 1792 IPV6CTL_RR_PRUNE, CTL_EOL); 1793 sysctl_createv(clog, 0, NULL, NULL, 1794 CTLFLAG_PERMANENT 1795 #ifndef INET6_BINDV6ONLY 1796 |CTLFLAG_READWRITE, 1797 #endif 1798 CTLTYPE_INT, "v6only", 1799 SYSCTL_DESCR("Disallow PF_INET6 sockets from connecting " 1800 "to PF_INET sockets"), 1801 NULL, 0, &ip6_v6only, 0, 1802 CTL_NET, PF_INET6, IPPROTO_IPV6, 1803 IPV6CTL_V6ONLY, CTL_EOL); 1804 sysctl_createv(clog, 0, NULL, NULL, 1805 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1806 CTLTYPE_INT, "anonportmin", 1807 SYSCTL_DESCR("Lowest ephemeral port number to assign"), 1808 sysctl_net_inet_ip_ports, 0, &ip6_anonportmin, 0, 1809 CTL_NET, PF_INET6, IPPROTO_IPV6, 1810 IPV6CTL_ANONPORTMIN, CTL_EOL); 1811 sysctl_createv(clog, 0, NULL, NULL, 1812 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1813 CTLTYPE_INT, "anonportmax", 1814 SYSCTL_DESCR("Highest ephemeral port number to assign"), 1815 sysctl_net_inet_ip_ports, 0, &ip6_anonportmax, 0, 1816 CTL_NET, PF_INET6, IPPROTO_IPV6, 1817 IPV6CTL_ANONPORTMAX, CTL_EOL); 1818 #ifndef IPNOPRIVPORTS 1819 sysctl_createv(clog, 0, NULL, NULL, 1820 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1821 CTLTYPE_INT, "lowportmin", 1822 SYSCTL_DESCR("Lowest privileged ephemeral port number " 1823 "to assign"), 1824 sysctl_net_inet_ip_ports, 0, &ip6_lowportmin, 0, 1825 CTL_NET, PF_INET6, IPPROTO_IPV6, 1826 IPV6CTL_LOWPORTMIN, CTL_EOL); 1827 sysctl_createv(clog, 0, NULL, NULL, 1828 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1829 CTLTYPE_INT, "lowportmax", 1830 SYSCTL_DESCR("Highest privileged ephemeral port number " 1831 "to assign"), 1832 sysctl_net_inet_ip_ports, 0, &ip6_lowportmax, 0, 1833 CTL_NET, PF_INET6, IPPROTO_IPV6, 1834 IPV6CTL_LOWPORTMAX, CTL_EOL); 1835 #endif /* IPNOPRIVPORTS */ 1836 sysctl_createv(clog, 0, NULL, NULL, 1837 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1838 CTLTYPE_INT, "auto_linklocal", 1839 SYSCTL_DESCR("Default value of per-interface flag for " 1840 "adding an IPv6 link-local address to " 1841 "interfaces when attached"), 1842 NULL, 0, &ip6_auto_linklocal, 0, 1843 CTL_NET, PF_INET6, IPPROTO_IPV6, 1844 IPV6CTL_AUTO_LINKLOCAL, CTL_EOL); 1845 sysctl_createv(clog, 0, NULL, NULL, 1846 CTLFLAG_PERMANENT|CTLFLAG_READONLY, 1847 CTLTYPE_STRUCT, "addctlpolicy", 1848 SYSCTL_DESCR("Return the current address control" 1849 " policy"), 1850 sysctl_net_inet6_addrctlpolicy, 0, NULL, 0, 1851 CTL_NET, PF_INET6, IPPROTO_IPV6, 1852 IPV6CTL_ADDRCTLPOLICY, CTL_EOL); 1853 sysctl_createv(clog, 0, NULL, NULL, 1854 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1855 CTLTYPE_INT, "use_tempaddr", 1856 SYSCTL_DESCR("Use temporary address"), 1857 NULL, 0, &ip6_use_tempaddr, 0, 1858 CTL_NET, PF_INET6, IPPROTO_IPV6, 1859 CTL_CREATE, CTL_EOL); 1860 sysctl_createv(clog, 0, NULL, NULL, 1861 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1862 CTLTYPE_INT, "prefer_tempaddr", 1863 SYSCTL_DESCR("Prefer temporary address as source " 1864 "address"), 1865 NULL, 0, &ip6_prefer_tempaddr, 0, 1866 CTL_NET, PF_INET6, IPPROTO_IPV6, 1867 CTL_CREATE, CTL_EOL); 1868 sysctl_createv(clog, 0, NULL, NULL, 1869 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1870 CTLTYPE_INT, "temppltime", 1871 SYSCTL_DESCR("preferred lifetime of a temporary address"), 1872 NULL, 0, &ip6_temp_preferred_lifetime, 0, 1873 CTL_NET, PF_INET6, IPPROTO_IPV6, 1874 CTL_CREATE, CTL_EOL); 1875 sysctl_createv(clog, 0, NULL, NULL, 1876 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1877 CTLTYPE_INT, "tempvltime", 1878 SYSCTL_DESCR("valid lifetime of a temporary address"), 1879 NULL, 0, &ip6_temp_valid_lifetime, 0, 1880 CTL_NET, PF_INET6, IPPROTO_IPV6, 1881 CTL_CREATE, CTL_EOL); 1882 sysctl_createv(clog, 0, NULL, NULL, 1883 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1884 CTLTYPE_INT, "maxfrags", 1885 SYSCTL_DESCR("Maximum fragments in reassembly queue"), 1886 NULL, 0, &ip6_maxfrags, 0, 1887 CTL_NET, PF_INET6, IPPROTO_IPV6, 1888 IPV6CTL_MAXFRAGS, CTL_EOL); 1889 sysctl_createv(clog, 0, NULL, NULL, 1890 CTLFLAG_PERMANENT, 1891 CTLTYPE_STRUCT, "stats", 1892 SYSCTL_DESCR("IPv6 statistics"), 1893 sysctl_net_inet6_ip6_stats, 0, NULL, 0, 1894 CTL_NET, PF_INET6, IPPROTO_IPV6, 1895 IPV6CTL_STATS, CTL_EOL); 1896 sysctl_createv(clog, 0, NULL, NULL, 1897 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1898 CTLTYPE_INT, "use_defaultzone", 1899 SYSCTL_DESCR("Whether to use the default scope zones"), 1900 NULL, 0, &ip6_use_defzone, 0, 1901 CTL_NET, PF_INET6, IPPROTO_IPV6, 1902 IPV6CTL_USE_DEFAULTZONE, CTL_EOL); 1903 sysctl_createv(clog, 0, NULL, NULL, 1904 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1905 CTLTYPE_INT, "mcast_pmtu", 1906 SYSCTL_DESCR("Enable pMTU discovery for multicast packet"), 1907 NULL, 0, &ip6_mcast_pmtu, 0, 1908 CTL_NET, PF_INET6, IPPROTO_IPV6, 1909 CTL_CREATE, CTL_EOL); 1910 /* anonportalgo RFC6056 subtree */ 1911 const struct sysctlnode *portalgo_node; 1912 sysctl_createv(clog, 0, NULL, &portalgo_node, 1913 CTLFLAG_PERMANENT, 1914 CTLTYPE_NODE, "anonportalgo", 1915 SYSCTL_DESCR("Anonymous port algorithm selection (RFC 6056)"), 1916 NULL, 0, NULL, 0, 1917 CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_CREATE, CTL_EOL); 1918 sysctl_createv(clog, 0, &portalgo_node, NULL, 1919 CTLFLAG_PERMANENT, 1920 CTLTYPE_STRING, "available", 1921 SYSCTL_DESCR("available algorithms"), 1922 sysctl_portalgo_available, 0, NULL, PORTALGO_MAXLEN, 1923 CTL_CREATE, CTL_EOL); 1924 sysctl_createv(clog, 0, &portalgo_node, NULL, 1925 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1926 CTLTYPE_STRING, "selected", 1927 SYSCTL_DESCR("selected algorithm"), 1928 sysctl_portalgo_selected6, 0, NULL, PORTALGO_MAXLEN, 1929 CTL_CREATE, CTL_EOL); 1930 sysctl_createv(clog, 0, &portalgo_node, NULL, 1931 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1932 CTLTYPE_STRUCT, "reserve", 1933 SYSCTL_DESCR("bitmap of reserved ports"), 1934 sysctl_portalgo_reserve6, 0, NULL, 0, 1935 CTL_CREATE, CTL_EOL); 1936 sysctl_createv(clog, 0, NULL, NULL, 1937 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1938 CTLTYPE_INT, "neighborgcthresh", 1939 SYSCTL_DESCR("Maximum number of entries in neighbor" 1940 " cache"), 1941 NULL, 1, &ip6_neighborgcthresh, 0, 1942 CTL_NET, PF_INET6, IPPROTO_IPV6, 1943 CTL_CREATE, CTL_EOL); 1944 sysctl_createv(clog, 0, NULL, NULL, 1945 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1946 CTLTYPE_INT, "maxifprefixes", 1947 SYSCTL_DESCR("Maximum number of prefixes created by" 1948 " route advertisement per interface"), 1949 NULL, 1, &ip6_maxifprefixes, 0, 1950 CTL_NET, PF_INET6, IPPROTO_IPV6, 1951 CTL_CREATE, CTL_EOL); 1952 sysctl_createv(clog, 0, NULL, NULL, 1953 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1954 CTLTYPE_INT, "maxifdefrouters", 1955 SYSCTL_DESCR("Maximum number of default routers created" 1956 " by route advertisement per interface"), 1957 NULL, 1, &ip6_maxifdefrouters, 0, 1958 CTL_NET, PF_INET6, IPPROTO_IPV6, 1959 CTL_CREATE, CTL_EOL); 1960 sysctl_createv(clog, 0, NULL, NULL, 1961 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1962 CTLTYPE_INT, "maxdynroutes", 1963 SYSCTL_DESCR("Maximum number of routes created via" 1964 " redirect"), 1965 NULL, 1, &ip6_maxdynroutes, 0, 1966 CTL_NET, PF_INET6, IPPROTO_IPV6, 1967 CTL_CREATE, CTL_EOL); 1968 } 1969 1970 void 1971 ip6_statinc(u_int stat) 1972 { 1973 1974 KASSERT(stat < IP6_NSTATS); 1975 IP6_STATINC(stat); 1976 } 1977
Indexes created Tue Sep 23 14:10:03 GMT 2025