ip6_input.c revision 1.170
1 /* $NetBSD: ip6_input.c,v 1.170 2016/11/01 10:32:57 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 1.170 2016/11/01 10:32:57 ozaki-r Exp $"); 66 67 #ifdef _KERNEL_OPT 68 #include "opt_gateway.h" 69 #include "opt_inet.h" 70 #include "opt_inet6.h" 71 #include "opt_ipsec.h" 72 #include "opt_compat_netbsd.h" 73 #include "opt_net_mpsafe.h" 74 #endif 75 76 #include <sys/param.h> 77 #include <sys/systm.h> 78 #include <sys/malloc.h> 79 #include <sys/mbuf.h> 80 #include <sys/domain.h> 81 #include <sys/protosw.h> 82 #include <sys/socket.h> 83 #include <sys/socketvar.h> 84 #include <sys/errno.h> 85 #include <sys/time.h> 86 #include <sys/kernel.h> 87 #include <sys/syslog.h> 88 #include <sys/proc.h> 89 #include <sys/sysctl.h> 90 #include <sys/cprng.h> 91 #include <sys/percpu.h> 92 93 #include <net/if.h> 94 #include <net/if_types.h> 95 #include <net/if_dl.h> 96 #include <net/route.h> 97 #include <net/pktqueue.h> 98 #include <net/pfil.h> 99 100 #include <netinet/in.h> 101 #include <netinet/in_systm.h> 102 #ifdef INET 103 #include <netinet/ip.h> 104 #include <netinet/ip_var.h> 105 #include <netinet/ip_icmp.h> 106 #endif /* INET */ 107 #include <netinet/ip6.h> 108 #include <netinet/portalgo.h> 109 #include <netinet6/in6_var.h> 110 #include <netinet6/ip6_var.h> 111 #include <netinet6/ip6_private.h> 112 #include <netinet6/in6_pcb.h> 113 #include <netinet/icmp6.h> 114 #include <netinet6/scope6_var.h> 115 #include <netinet6/in6_ifattach.h> 116 #include <netinet6/nd6.h> 117 118 #ifdef IPSEC 119 #include <netipsec/ipsec.h> 120 #include <netipsec/ipsec6.h> 121 #include <netipsec/key.h> 122 #endif /* IPSEC */ 123 124 #ifdef COMPAT_50 125 #include <compat/sys/time.h> 126 #include <compat/sys/socket.h> 127 #endif 128 129 #include <netinet6/ip6protosw.h> 130 131 #include "faith.h" 132 133 #include <net/net_osdep.h> 134 135 extern struct domain inet6domain; 136 137 u_char ip6_protox[IPPROTO_MAX]; 138 pktqueue_t *ip6_pktq __read_mostly; 139 140 int ip6_forward_srcrt; /* XXX */ 141 int ip6_sourcecheck; /* XXX */ 142 int ip6_sourcecheck_interval; /* XXX */ 143 144 pfil_head_t *inet6_pfil_hook; 145 146 percpu_t *ip6stat_percpu; 147 148 percpu_t *ip6_forward_rt_percpu __cacheline_aligned; 149 150 static void ip6_init2(void); 151 static void ip6intr(void *); 152 static struct m_tag *ip6_setdstifaddr(struct mbuf *, const struct in6_ifaddr *); 153 154 static int ip6_process_hopopts(struct mbuf *, u_int8_t *, int, u_int32_t *, 155 u_int32_t *); 156 static struct mbuf *ip6_pullexthdr(struct mbuf *, size_t, int); 157 static void sysctl_net_inet6_ip6_setup(struct sysctllog **); 158 159 #ifdef NET_MPSAFE 160 #define SOFTNET_LOCK() mutex_enter(softnet_lock) 161 #define SOFTNET_UNLOCK() mutex_exit(softnet_lock) 162 #else 163 #define SOFTNET_LOCK() KASSERT(mutex_owned(softnet_lock)) 164 #define SOFTNET_UNLOCK() KASSERT(mutex_owned(softnet_lock)) 165 #endif 166 167 /* 168 * IP6 initialization: fill in IP6 protocol switch table. 169 * All protocols not implemented in kernel go to raw IP6 protocol handler. 170 */ 171 void 172 ip6_init(void) 173 { 174 const struct ip6protosw *pr; 175 int i; 176 177 in6_init(); 178 179 sysctl_net_inet6_ip6_setup(NULL); 180 pr = (const struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 181 if (pr == 0) 182 panic("ip6_init"); 183 for (i = 0; i < IPPROTO_MAX; i++) 184 ip6_protox[i] = pr - inet6sw; 185 for (pr = (const struct ip6protosw *)inet6domain.dom_protosw; 186 pr < (const struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++) 187 if (pr->pr_domain->dom_family == PF_INET6 && 188 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) 189 ip6_protox[pr->pr_protocol] = pr - inet6sw; 190 191 ip6_pktq = pktq_create(IFQ_MAXLEN, ip6intr, NULL); 192 KASSERT(ip6_pktq != NULL); 193 194 scope6_init(); 195 addrsel_policy_init(); 196 nd6_init(); 197 frag6_init(); 198 ip6_desync_factor = cprng_fast32() % MAX_TEMP_DESYNC_FACTOR; 199 200 ip6_init2(); 201 #ifdef GATEWAY 202 ip6flow_init(ip6_hashsize); 203 #endif 204 /* Register our Packet Filter hook. */ 205 inet6_pfil_hook = pfil_head_create(PFIL_TYPE_AF, (void *)AF_INET6); 206 KASSERT(inet6_pfil_hook != NULL); 207 208 ip6stat_percpu = percpu_alloc(sizeof(uint64_t) * IP6_NSTATS); 209 210 ip6_forward_rt_percpu = percpu_alloc(sizeof(struct route)); 211 if (ip6_forward_rt_percpu == NULL) 212 panic("failed to alllocate ip6_forward_rt_percpu"); 213 } 214 215 static void 216 ip6_init2(void) 217 { 218 219 /* timer for regeneranation of temporary addresses randomize ID */ 220 callout_init(&in6_tmpaddrtimer_ch, CALLOUT_MPSAFE); 221 callout_reset(&in6_tmpaddrtimer_ch, 222 (ip6_temp_preferred_lifetime - ip6_desync_factor - 223 ip6_temp_regen_advance) * hz, 224 in6_tmpaddrtimer, NULL); 225 } 226 227 /* 228 * IP6 input interrupt handling. Just pass the packet to ip6_input. 229 */ 230 static void 231 ip6intr(void *arg __unused) 232 { 233 struct mbuf *m; 234 235 #ifndef NET_MPSAFE 236 mutex_enter(softnet_lock); 237 #endif 238 while ((m = pktq_dequeue(ip6_pktq)) != NULL) { 239 struct psref psref; 240 struct ifnet *rcvif = m_get_rcvif_psref(m, &psref); 241 242 if (rcvif == NULL) { 243 m_freem(m); 244 continue; 245 } 246 /* 247 * Drop the packet if IPv6 is disabled on the interface. 248 */ 249 if ((ND_IFINFO(rcvif)->flags & ND6_IFF_IFDISABLED)) { 250 m_put_rcvif_psref(rcvif, &psref); 251 m_freem(m); 252 continue; 253 } 254 ip6_input(m, rcvif); 255 m_put_rcvif_psref(rcvif, &psref); 256 } 257 #ifndef NET_MPSAFE 258 mutex_exit(softnet_lock); 259 #endif 260 } 261 262 void 263 ip6_input(struct mbuf *m, struct ifnet *rcvif) 264 { 265 struct ip6_hdr *ip6; 266 int hit, off = sizeof(struct ip6_hdr), nest; 267 u_int32_t plen; 268 u_int32_t rtalert = ~0; 269 int nxt, ours = 0, rh_present = 0; 270 struct ifnet *deliverifp = NULL; 271 int srcrt = 0; 272 const struct rtentry *rt; 273 union { 274 struct sockaddr dst; 275 struct sockaddr_in6 dst6; 276 } u; 277 struct route *ro; 278 279 /* 280 * make sure we don't have onion peering information into m_tag. 281 */ 282 ip6_delaux(m); 283 284 /* 285 * mbuf statistics 286 */ 287 if (m->m_flags & M_EXT) { 288 if (m->m_next) 289 IP6_STATINC(IP6_STAT_MEXT2M); 290 else 291 IP6_STATINC(IP6_STAT_MEXT1); 292 } else { 293 #define M2MMAX 32 294 if (m->m_next) { 295 if (m->m_flags & M_LOOP) 296 /*XXX*/ IP6_STATINC(IP6_STAT_M2M + lo0ifp->if_index); 297 else if (rcvif->if_index < M2MMAX) 298 IP6_STATINC(IP6_STAT_M2M + rcvif->if_index); 299 else 300 IP6_STATINC(IP6_STAT_M2M); 301 } else 302 IP6_STATINC(IP6_STAT_M1); 303 #undef M2MMAX 304 } 305 306 in6_ifstat_inc(rcvif, ifs6_in_receive); 307 IP6_STATINC(IP6_STAT_TOTAL); 308 309 /* 310 * If the IPv6 header is not aligned, slurp it up into a new 311 * mbuf with space for link headers, in the event we forward 312 * it. Otherwise, if it is aligned, make sure the entire base 313 * IPv6 header is in the first mbuf of the chain. 314 */ 315 if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 316 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 317 (max_linkhdr + 3) & ~3)) == NULL) { 318 /* XXXJRT new stat, please */ 319 IP6_STATINC(IP6_STAT_TOOSMALL); 320 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 321 return; 322 } 323 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 324 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 325 IP6_STATINC(IP6_STAT_TOOSMALL); 326 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 327 return; 328 } 329 } 330 331 ip6 = mtod(m, struct ip6_hdr *); 332 333 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 334 IP6_STATINC(IP6_STAT_BADVERS); 335 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 336 goto bad; 337 } 338 339 /* 340 * Assume that we can create a fast-forward IP flow entry 341 * based on this packet. 342 */ 343 m->m_flags |= M_CANFASTFWD; 344 345 /* 346 * Run through list of hooks for input packets. If there are any 347 * filters which require that additional packets in the flow are 348 * not fast-forwarded, they must clear the M_CANFASTFWD flag. 349 * Note that filters must _never_ set this flag, as another filter 350 * in the list may have previously cleared it. 351 */ 352 /* 353 * let ipfilter look at packet on the wire, 354 * not the decapsulated packet. 355 */ 356 #if defined(IPSEC) 357 if (!ipsec_used || !ipsec_indone(m)) 358 #else 359 if (1) 360 #endif 361 { 362 struct in6_addr odst; 363 364 odst = ip6->ip6_dst; 365 if (pfil_run_hooks(inet6_pfil_hook, &m, rcvif, PFIL_IN) != 0) 366 return; 367 if (m == NULL) 368 return; 369 ip6 = mtod(m, struct ip6_hdr *); 370 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst); 371 } 372 373 IP6_STATINC(IP6_STAT_NXTHIST + ip6->ip6_nxt); 374 375 #ifdef ALTQ 376 if (altq_input != NULL) { 377 SOFTNET_LOCK(); 378 if ((*altq_input)(m, AF_INET6) == 0) { 379 SOFTNET_UNLOCK(); 380 /* packet is dropped by traffic conditioner */ 381 return; 382 } 383 SOFTNET_UNLOCK(); 384 } 385 #endif 386 387 /* 388 * Check against address spoofing/corruption. 389 */ 390 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) || 391 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) { 392 /* 393 * XXX: "badscope" is not very suitable for a multicast source. 394 */ 395 IP6_STATINC(IP6_STAT_BADSCOPE); 396 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 397 goto bad; 398 } 399 /* 400 * The following check is not documented in specs. A malicious 401 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack 402 * and bypass security checks (act as if it was from 127.0.0.1 by using 403 * IPv6 src ::ffff:127.0.0.1). Be cautious. 404 * 405 * This check chokes if we are in an SIIT cloud. As none of BSDs 406 * support IPv4-less kernel compilation, we cannot support SIIT 407 * environment at all. So, it makes more sense for us to reject any 408 * malicious packets for non-SIIT environment, than try to do a 409 * partial support for SIIT environment. 410 */ 411 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 412 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 413 IP6_STATINC(IP6_STAT_BADSCOPE); 414 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 415 goto bad; 416 } 417 #if 0 418 /* 419 * Reject packets with IPv4 compatible addresses (auto tunnel). 420 * 421 * The code forbids auto tunnel relay case in RFC1933 (the check is 422 * stronger than RFC1933). We may want to re-enable it if mech-xx 423 * is revised to forbid relaying case. 424 */ 425 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) || 426 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) { 427 IP6_STATINC(IP6_STAT_BADSCOPE); 428 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 429 goto bad; 430 } 431 #endif 432 433 /* 434 * Disambiguate address scope zones (if there is ambiguity). 435 * We first make sure that the original source or destination address 436 * is not in our internal form for scoped addresses. Such addresses 437 * are not necessarily invalid spec-wise, but we cannot accept them due 438 * to the usage conflict. 439 * in6_setscope() then also checks and rejects the cases where src or 440 * dst are the loopback address and the receiving interface 441 * is not loopback. 442 */ 443 if (__predict_false( 444 m_makewritable(&m, 0, sizeof(struct ip6_hdr), M_DONTWAIT))) 445 goto bad; 446 ip6 = mtod(m, struct ip6_hdr *); 447 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) { 448 IP6_STATINC(IP6_STAT_BADSCOPE); /* XXX */ 449 goto bad; 450 } 451 if (in6_setscope(&ip6->ip6_src, rcvif, NULL) || 452 in6_setscope(&ip6->ip6_dst, rcvif, NULL)) { 453 IP6_STATINC(IP6_STAT_BADSCOPE); 454 goto bad; 455 } 456 457 /* 458 * Multicast check 459 */ 460 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 461 struct in6_multi *in6m = 0; 462 463 in6_ifstat_inc(rcvif, ifs6_in_mcast); 464 /* 465 * See if we belong to the destination multicast group on the 466 * arrival interface. 467 */ 468 IN6_LOOKUP_MULTI(ip6->ip6_dst, rcvif, in6m); 469 if (in6m) 470 ours = 1; 471 else if (!ip6_mrouter) { 472 uint64_t *ip6s = IP6_STAT_GETREF(); 473 ip6s[IP6_STAT_NOTMEMBER]++; 474 ip6s[IP6_STAT_CANTFORWARD]++; 475 IP6_STAT_PUTREF(); 476 in6_ifstat_inc(rcvif, ifs6_in_discard); 477 goto bad; 478 } 479 deliverifp = rcvif; 480 goto hbhcheck; 481 } 482 483 sockaddr_in6_init(&u.dst6, &ip6->ip6_dst, 0, 0, 0); 484 485 /* 486 * Unicast check 487 */ 488 ro = percpu_getref(ip6_forward_rt_percpu); 489 rt = rtcache_lookup2(ro, &u.dst, 1, &hit); 490 percpu_putref(ip6_forward_rt_percpu); 491 if (hit) 492 IP6_STATINC(IP6_STAT_FORWARD_CACHEHIT); 493 else 494 IP6_STATINC(IP6_STAT_FORWARD_CACHEMISS); 495 496 #define rt6_getkey(__rt) satocsin6(rt_getkey(__rt)) 497 498 /* 499 * Accept the packet if the forwarding interface to the destination 500 * according to the routing table is the loopback interface, 501 * unless the associated route has a gateway. 502 * Note that this approach causes to accept a packet if there is a 503 * route to the loopback interface for the destination of the packet. 504 * But we think it's even useful in some situations, e.g. when using 505 * a special daemon which wants to intercept the packet. 506 */ 507 if (rt != NULL && 508 (rt->rt_flags & (RTF_HOST|RTF_GATEWAY)) == RTF_HOST && 509 #if 0 510 /* 511 * The check below is redundant since the comparison of 512 * the destination and the key of the rtentry has 513 * already done through looking up the routing table. 514 */ 515 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &rt6_getkey(rt)->sin6_addr) && 516 #endif 517 rt->rt_ifp->if_type == IFT_LOOP) { 518 struct in6_ifaddr *ia6 = (struct in6_ifaddr *)rt->rt_ifa; 519 if (ia6->ia6_flags & IN6_IFF_ANYCAST) 520 m->m_flags |= M_ANYCAST6; 521 /* 522 * packets to a tentative, duplicated, or somehow invalid 523 * address must not be accepted. 524 */ 525 if (!(ia6->ia6_flags & (IN6_IFF_NOTREADY | IN6_IFF_DETACHED))) { 526 /* this address is ready */ 527 ours = 1; 528 deliverifp = ia6->ia_ifp; /* correct? */ 529 goto hbhcheck; 530 } else { 531 /* address is not ready, so discard the packet. */ 532 nd6log(LOG_INFO, "packet to an unready address %s->%s\n", 533 ip6_sprintf(&ip6->ip6_src), 534 ip6_sprintf(&ip6->ip6_dst)); 535 536 goto bad; 537 } 538 } 539 540 /* 541 * FAITH (Firewall Aided Internet Translator) 542 */ 543 #if defined(NFAITH) && 0 < NFAITH 544 if (ip6_keepfaith) { 545 if (rt != NULL && rt->rt_ifp != NULL && 546 rt->rt_ifp->if_type == IFT_FAITH) { 547 /* XXX do we need more sanity checks? */ 548 ours = 1; 549 deliverifp = rt->rt_ifp; /* faith */ 550 goto hbhcheck; 551 } 552 } 553 #endif 554 555 #if 0 556 { 557 /* 558 * Last resort: check in6_ifaddr for incoming interface. 559 * The code is here until I update the "goto ours hack" code above 560 * working right. 561 */ 562 struct ifaddr *ifa; 563 IFADDR_READER_FOREACH(ifa, rcvif) { 564 if (ifa->ifa_addr->sa_family != AF_INET6) 565 continue; 566 if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) { 567 ours = 1; 568 deliverifp = ifa->ifa_ifp; 569 goto hbhcheck; 570 } 571 } 572 } 573 #endif 574 575 /* 576 * Now there is no reason to process the packet if it's not our own 577 * and we're not a router. 578 */ 579 if (!ip6_forwarding) { 580 IP6_STATINC(IP6_STAT_CANTFORWARD); 581 in6_ifstat_inc(rcvif, ifs6_in_discard); 582 goto bad; 583 } 584 585 hbhcheck: 586 /* 587 * record address information into m_tag, if we don't have one yet. 588 * note that we are unable to record it, if the address is not listed 589 * as our interface address (e.g. multicast addresses, addresses 590 * within FAITH prefixes and such). 591 */ 592 if (deliverifp && ip6_getdstifaddr(m) == NULL) { 593 struct in6_ifaddr *ia6; 594 int s = pserialize_read_enter(); 595 596 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 597 /* Depends on ip6_setdstifaddr never sleep */ 598 if (ia6 != NULL && ip6_setdstifaddr(m, ia6) == NULL) { 599 /* 600 * XXX maybe we should drop the packet here, 601 * as we could not provide enough information 602 * to the upper layers. 603 */ 604 } 605 pserialize_read_exit(s); 606 } 607 608 /* 609 * Process Hop-by-Hop options header if it's contained. 610 * m may be modified in ip6_hopopts_input(). 611 * If a JumboPayload option is included, plen will also be modified. 612 */ 613 plen = (u_int32_t)ntohs(ip6->ip6_plen); 614 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 615 struct ip6_hbh *hbh; 616 617 if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) { 618 #if 0 /*touches NULL pointer*/ 619 in6_ifstat_inc(rcvif, ifs6_in_discard); 620 #endif 621 return; /* m have already been freed */ 622 } 623 624 /* adjust pointer */ 625 ip6 = mtod(m, struct ip6_hdr *); 626 627 /* 628 * if the payload length field is 0 and the next header field 629 * indicates Hop-by-Hop Options header, then a Jumbo Payload 630 * option MUST be included. 631 */ 632 if (ip6->ip6_plen == 0 && plen == 0) { 633 /* 634 * Note that if a valid jumbo payload option is 635 * contained, ip6_hopopts_input() must set a valid 636 * (non-zero) payload length to the variable plen. 637 */ 638 IP6_STATINC(IP6_STAT_BADOPTIONS); 639 in6_ifstat_inc(rcvif, ifs6_in_discard); 640 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 641 icmp6_error(m, ICMP6_PARAM_PROB, 642 ICMP6_PARAMPROB_HEADER, 643 (char *)&ip6->ip6_plen - (char *)ip6); 644 return; 645 } 646 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 647 sizeof(struct ip6_hbh)); 648 if (hbh == NULL) { 649 IP6_STATINC(IP6_STAT_TOOSHORT); 650 return; 651 } 652 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 653 nxt = hbh->ip6h_nxt; 654 655 /* 656 * accept the packet if a router alert option is included 657 * and we act as an IPv6 router. 658 */ 659 if (rtalert != ~0 && ip6_forwarding) 660 ours = 1; 661 } else 662 nxt = ip6->ip6_nxt; 663 664 /* 665 * Check that the amount of data in the buffers 666 * is as at least much as the IPv6 header would have us expect. 667 * Trim mbufs if longer than we expect. 668 * Drop packet if shorter than we expect. 669 */ 670 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 671 IP6_STATINC(IP6_STAT_TOOSHORT); 672 in6_ifstat_inc(rcvif, ifs6_in_truncated); 673 goto bad; 674 } 675 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 676 if (m->m_len == m->m_pkthdr.len) { 677 m->m_len = sizeof(struct ip6_hdr) + plen; 678 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 679 } else 680 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 681 } 682 683 /* 684 * Forward if desirable. 685 */ 686 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 687 /* 688 * If we are acting as a multicast router, all 689 * incoming multicast packets are passed to the 690 * kernel-level multicast forwarding function. 691 * The packet is returned (relatively) intact; if 692 * ip6_mforward() returns a non-zero value, the packet 693 * must be discarded, else it may be accepted below. 694 */ 695 if (ip6_mrouter != NULL) { 696 int error; 697 698 SOFTNET_LOCK(); 699 error = ip6_mforward(ip6, rcvif, m); 700 SOFTNET_UNLOCK(); 701 702 if (error != 0) { 703 IP6_STATINC(IP6_STAT_CANTFORWARD); 704 goto bad; 705 } 706 } 707 if (!ours) 708 goto bad; 709 } else if (!ours) { 710 ip6_forward(m, srcrt); 711 return; 712 } 713 714 ip6 = mtod(m, struct ip6_hdr *); 715 716 /* 717 * Malicious party may be able to use IPv4 mapped addr to confuse 718 * tcp/udp stack and bypass security checks (act as if it was from 719 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious. 720 * 721 * For SIIT end node behavior, you may want to disable the check. 722 * However, you will become vulnerable to attacks using IPv4 mapped 723 * source. 724 */ 725 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 726 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 727 IP6_STATINC(IP6_STAT_BADSCOPE); 728 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 729 goto bad; 730 } 731 732 /* 733 * Tell launch routine the next header 734 */ 735 #ifdef IFA_STATS 736 if (deliverifp != NULL) { 737 struct in6_ifaddr *ia6; 738 int s = pserialize_read_enter(); 739 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 740 if (ia6) 741 ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len; 742 pserialize_read_exit(s); 743 } 744 #endif 745 IP6_STATINC(IP6_STAT_DELIVERED); 746 in6_ifstat_inc(deliverifp, ifs6_in_deliver); 747 nest = 0; 748 749 rh_present = 0; 750 while (nxt != IPPROTO_DONE) { 751 if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) { 752 IP6_STATINC(IP6_STAT_TOOMANYHDR); 753 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 754 goto bad; 755 } 756 757 /* 758 * protection against faulty packet - there should be 759 * more sanity checks in header chain processing. 760 */ 761 if (m->m_pkthdr.len < off) { 762 IP6_STATINC(IP6_STAT_TOOSHORT); 763 in6_ifstat_inc(rcvif, ifs6_in_truncated); 764 goto bad; 765 } 766 767 if (nxt == IPPROTO_ROUTING) { 768 if (rh_present++) { 769 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 770 IP6_STATINC(IP6_STAT_BADOPTIONS); 771 goto bad; 772 } 773 } 774 775 #ifdef IPSEC 776 if (ipsec_used) { 777 /* 778 * enforce IPsec policy checking if we are seeing last 779 * header. note that we do not visit this with 780 * protocols with pcb layer code - like udp/tcp/raw ip. 781 */ 782 if ((inet6sw[ip_protox[nxt]].pr_flags 783 & PR_LASTHDR) != 0) { 784 int error; 785 786 SOFTNET_LOCK(); 787 error = ipsec6_input(m); 788 SOFTNET_UNLOCK(); 789 if (error) 790 goto bad; 791 } 792 } 793 #endif /* IPSEC */ 794 795 SOFTNET_LOCK(); 796 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt); 797 SOFTNET_UNLOCK(); 798 } 799 return; 800 bad: 801 m_freem(m); 802 } 803 804 /* 805 * set/grab in6_ifaddr correspond to IPv6 destination address. 806 */ 807 static struct m_tag * 808 ip6_setdstifaddr(struct mbuf *m, const struct in6_ifaddr *ia) 809 { 810 struct m_tag *mtag; 811 struct ip6aux *ip6a; 812 813 mtag = ip6_addaux(m); 814 if (mtag == NULL) 815 return NULL; 816 817 ip6a = (struct ip6aux *)(mtag + 1); 818 if (in6_setscope(&ip6a->ip6a_src, ia->ia_ifp, &ip6a->ip6a_scope_id)) { 819 IP6_STATINC(IP6_STAT_BADSCOPE); 820 return NULL; 821 } 822 823 ip6a->ip6a_src = ia->ia_addr.sin6_addr; 824 ip6a->ip6a_flags = ia->ia6_flags; 825 return mtag; 826 } 827 828 const struct ip6aux * 829 ip6_getdstifaddr(struct mbuf *m) 830 { 831 struct m_tag *mtag; 832 833 mtag = ip6_findaux(m); 834 if (mtag != NULL) 835 return (struct ip6aux *)(mtag + 1); 836 else 837 return NULL; 838 } 839 840 /* 841 * Hop-by-Hop options header processing. If a valid jumbo payload option is 842 * included, the real payload length will be stored in plenp. 843 * 844 * rtalertp - XXX: should be stored more smart way 845 */ 846 int 847 ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp, 848 struct mbuf **mp, int *offp) 849 { 850 struct mbuf *m = *mp; 851 int off = *offp, hbhlen; 852 struct ip6_hbh *hbh; 853 854 /* validation of the length of the header */ 855 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, 856 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh)); 857 if (hbh == NULL) { 858 IP6_STATINC(IP6_STAT_TOOSHORT); 859 return -1; 860 } 861 hbhlen = (hbh->ip6h_len + 1) << 3; 862 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 863 hbhlen); 864 if (hbh == NULL) { 865 IP6_STATINC(IP6_STAT_TOOSHORT); 866 return -1; 867 } 868 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 869 off += hbhlen; 870 hbhlen -= sizeof(struct ip6_hbh); 871 872 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 873 hbhlen, rtalertp, plenp) < 0) 874 return (-1); 875 876 *offp = off; 877 *mp = m; 878 return (0); 879 } 880 881 /* 882 * Search header for all Hop-by-hop options and process each option. 883 * This function is separate from ip6_hopopts_input() in order to 884 * handle a case where the sending node itself process its hop-by-hop 885 * options header. In such a case, the function is called from ip6_output(). 886 * 887 * The function assumes that hbh header is located right after the IPv6 header 888 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to 889 * opthead + hbhlen is located in continuous memory region. 890 */ 891 static int 892 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen, 893 u_int32_t *rtalertp, u_int32_t *plenp) 894 { 895 struct ip6_hdr *ip6; 896 int optlen = 0; 897 u_int8_t *opt = opthead; 898 u_int16_t rtalert_val; 899 u_int32_t jumboplen; 900 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh); 901 902 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 903 switch (*opt) { 904 case IP6OPT_PAD1: 905 optlen = 1; 906 break; 907 case IP6OPT_PADN: 908 if (hbhlen < IP6OPT_MINLEN) { 909 IP6_STATINC(IP6_STAT_TOOSMALL); 910 goto bad; 911 } 912 optlen = *(opt + 1) + 2; 913 break; 914 case IP6OPT_RTALERT: 915 /* XXX may need check for alignment */ 916 if (hbhlen < IP6OPT_RTALERT_LEN) { 917 IP6_STATINC(IP6_STAT_TOOSMALL); 918 goto bad; 919 } 920 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) { 921 /* XXX stat */ 922 icmp6_error(m, ICMP6_PARAM_PROB, 923 ICMP6_PARAMPROB_HEADER, 924 erroff + opt + 1 - opthead); 925 return (-1); 926 } 927 optlen = IP6OPT_RTALERT_LEN; 928 memcpy((void *)&rtalert_val, (void *)(opt + 2), 2); 929 *rtalertp = ntohs(rtalert_val); 930 break; 931 case IP6OPT_JUMBO: 932 /* XXX may need check for alignment */ 933 if (hbhlen < IP6OPT_JUMBO_LEN) { 934 IP6_STATINC(IP6_STAT_TOOSMALL); 935 goto bad; 936 } 937 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) { 938 /* XXX stat */ 939 icmp6_error(m, ICMP6_PARAM_PROB, 940 ICMP6_PARAMPROB_HEADER, 941 erroff + opt + 1 - opthead); 942 return (-1); 943 } 944 optlen = IP6OPT_JUMBO_LEN; 945 946 /* 947 * IPv6 packets that have non 0 payload length 948 * must not contain a jumbo payload option. 949 */ 950 ip6 = mtod(m, struct ip6_hdr *); 951 if (ip6->ip6_plen) { 952 IP6_STATINC(IP6_STAT_BADOPTIONS); 953 icmp6_error(m, ICMP6_PARAM_PROB, 954 ICMP6_PARAMPROB_HEADER, 955 erroff + opt - opthead); 956 return (-1); 957 } 958 959 /* 960 * We may see jumbolen in unaligned location, so 961 * we'd need to perform bcopy(). 962 */ 963 memcpy(&jumboplen, opt + 2, sizeof(jumboplen)); 964 jumboplen = (u_int32_t)htonl(jumboplen); 965 966 #if 1 967 /* 968 * if there are multiple jumbo payload options, 969 * *plenp will be non-zero and the packet will be 970 * rejected. 971 * the behavior may need some debate in ipngwg - 972 * multiple options does not make sense, however, 973 * there's no explicit mention in specification. 974 */ 975 if (*plenp != 0) { 976 IP6_STATINC(IP6_STAT_BADOPTIONS); 977 icmp6_error(m, ICMP6_PARAM_PROB, 978 ICMP6_PARAMPROB_HEADER, 979 erroff + opt + 2 - opthead); 980 return (-1); 981 } 982 #endif 983 984 /* 985 * jumbo payload length must be larger than 65535. 986 */ 987 if (jumboplen <= IPV6_MAXPACKET) { 988 IP6_STATINC(IP6_STAT_BADOPTIONS); 989 icmp6_error(m, ICMP6_PARAM_PROB, 990 ICMP6_PARAMPROB_HEADER, 991 erroff + opt + 2 - opthead); 992 return (-1); 993 } 994 *plenp = jumboplen; 995 996 break; 997 default: /* unknown option */ 998 if (hbhlen < IP6OPT_MINLEN) { 999 IP6_STATINC(IP6_STAT_TOOSMALL); 1000 goto bad; 1001 } 1002 optlen = ip6_unknown_opt(opt, m, 1003 erroff + opt - opthead); 1004 if (optlen == -1) 1005 return (-1); 1006 optlen += 2; 1007 break; 1008 } 1009 } 1010 1011 return (0); 1012 1013 bad: 1014 m_freem(m); 1015 return (-1); 1016 } 1017 1018 /* 1019 * Unknown option processing. 1020 * The third argument `off' is the offset from the IPv6 header to the option, 1021 * which is necessary if the IPv6 header the and option header and IPv6 header 1022 * is not continuous in order to return an ICMPv6 error. 1023 */ 1024 int 1025 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off) 1026 { 1027 struct ip6_hdr *ip6; 1028 1029 switch (IP6OPT_TYPE(*optp)) { 1030 case IP6OPT_TYPE_SKIP: /* ignore the option */ 1031 return ((int)*(optp + 1)); 1032 case IP6OPT_TYPE_DISCARD: /* silently discard */ 1033 m_freem(m); 1034 return (-1); 1035 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 1036 IP6_STATINC(IP6_STAT_BADOPTIONS); 1037 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 1038 return (-1); 1039 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 1040 IP6_STATINC(IP6_STAT_BADOPTIONS); 1041 ip6 = mtod(m, struct ip6_hdr *); 1042 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 1043 (m->m_flags & (M_BCAST|M_MCAST))) 1044 m_freem(m); 1045 else 1046 icmp6_error(m, ICMP6_PARAM_PROB, 1047 ICMP6_PARAMPROB_OPTION, off); 1048 return (-1); 1049 } 1050 1051 m_freem(m); /* XXX: NOTREACHED */ 1052 return (-1); 1053 } 1054 1055 /* 1056 * Create the "control" list for this pcb. 1057 * 1058 * The routine will be called from upper layer handlers like tcp6_input(). 1059 * Thus the routine assumes that the caller (tcp6_input) have already 1060 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the 1061 * very first mbuf on the mbuf chain. 1062 * We may want to add some infinite loop prevention or sanity checks for safety. 1063 * (This applies only when you are using KAME mbuf chain restriction, i.e. 1064 * you are using IP6_EXTHDR_CHECK() not m_pulldown()) 1065 */ 1066 void 1067 ip6_savecontrol(struct in6pcb *in6p, struct mbuf **mp, 1068 struct ip6_hdr *ip6, struct mbuf *m) 1069 { 1070 #ifdef RFC2292 1071 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y)) 1072 #else 1073 #define IS2292(x, y) (y) 1074 #endif 1075 1076 if (in6p->in6p_socket->so_options & SO_TIMESTAMP 1077 #ifdef SO_OTIMESTAMP 1078 || in6p->in6p_socket->so_options & SO_OTIMESTAMP 1079 #endif 1080 ) { 1081 struct timeval tv; 1082 1083 microtime(&tv); 1084 #ifdef SO_OTIMESTAMP 1085 if (in6p->in6p_socket->so_options & SO_OTIMESTAMP) { 1086 struct timeval50 tv50; 1087 timeval_to_timeval50(&tv, &tv50); 1088 *mp = sbcreatecontrol((void *) &tv50, sizeof(tv50), 1089 SCM_OTIMESTAMP, SOL_SOCKET); 1090 } else 1091 #endif 1092 *mp = sbcreatecontrol((void *) &tv, sizeof(tv), 1093 SCM_TIMESTAMP, SOL_SOCKET); 1094 if (*mp) 1095 mp = &(*mp)->m_next; 1096 } 1097 1098 /* some OSes call this logic with IPv4 packet, for SO_TIMESTAMP */ 1099 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) 1100 return; 1101 1102 /* RFC 2292 sec. 5 */ 1103 if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) { 1104 struct in6_pktinfo pi6; 1105 1106 memcpy(&pi6.ipi6_addr, &ip6->ip6_dst, sizeof(struct in6_addr)); 1107 in6_clearscope(&pi6.ipi6_addr); /* XXX */ 1108 pi6.ipi6_ifindex = m->m_pkthdr.rcvif_index; 1109 *mp = sbcreatecontrol((void *) &pi6, 1110 sizeof(struct in6_pktinfo), 1111 IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6); 1112 if (*mp) 1113 mp = &(*mp)->m_next; 1114 } 1115 1116 if (in6p->in6p_flags & IN6P_HOPLIMIT) { 1117 int hlim = ip6->ip6_hlim & 0xff; 1118 1119 *mp = sbcreatecontrol((void *) &hlim, sizeof(int), 1120 IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6); 1121 if (*mp) 1122 mp = &(*mp)->m_next; 1123 } 1124 1125 if ((in6p->in6p_flags & IN6P_TCLASS) != 0) { 1126 u_int32_t flowinfo; 1127 int tclass; 1128 1129 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK); 1130 flowinfo >>= 20; 1131 1132 tclass = flowinfo & 0xff; 1133 *mp = sbcreatecontrol((void *)&tclass, sizeof(tclass), 1134 IPV6_TCLASS, IPPROTO_IPV6); 1135 1136 if (*mp) 1137 mp = &(*mp)->m_next; 1138 } 1139 1140 /* 1141 * IPV6_HOPOPTS socket option. Recall that we required super-user 1142 * privilege for the option (see ip6_ctloutput), but it might be too 1143 * strict, since there might be some hop-by-hop options which can be 1144 * returned to normal user. 1145 * See also RFC3542 section 8 (or RFC2292 section 6). 1146 */ 1147 if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0) { 1148 /* 1149 * Check if a hop-by-hop options header is contatined in the 1150 * received packet, and if so, store the options as ancillary 1151 * data. Note that a hop-by-hop options header must be 1152 * just after the IPv6 header, which fact is assured through 1153 * the IPv6 input processing. 1154 */ 1155 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1156 if (xip6->ip6_nxt == IPPROTO_HOPOPTS) { 1157 struct ip6_hbh *hbh; 1158 int hbhlen; 1159 struct mbuf *ext; 1160 1161 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr), 1162 xip6->ip6_nxt); 1163 if (ext == NULL) { 1164 IP6_STATINC(IP6_STAT_TOOSHORT); 1165 return; 1166 } 1167 hbh = mtod(ext, struct ip6_hbh *); 1168 hbhlen = (hbh->ip6h_len + 1) << 3; 1169 if (hbhlen != ext->m_len) { 1170 m_freem(ext); 1171 IP6_STATINC(IP6_STAT_TOOSHORT); 1172 return; 1173 } 1174 1175 /* 1176 * XXX: We copy whole the header even if a jumbo 1177 * payload option is included, which option is to 1178 * be removed before returning in the RFC 2292. 1179 * Note: this constraint is removed in RFC3542. 1180 */ 1181 *mp = sbcreatecontrol((void *)hbh, hbhlen, 1182 IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS), 1183 IPPROTO_IPV6); 1184 if (*mp) 1185 mp = &(*mp)->m_next; 1186 m_freem(ext); 1187 } 1188 } 1189 1190 /* IPV6_DSTOPTS and IPV6_RTHDR socket options */ 1191 if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) { 1192 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1193 int nxt = xip6->ip6_nxt, off = sizeof(struct ip6_hdr); 1194 1195 /* 1196 * Search for destination options headers or routing 1197 * header(s) through the header chain, and stores each 1198 * header as ancillary data. 1199 * Note that the order of the headers remains in 1200 * the chain of ancillary data. 1201 */ 1202 for (;;) { /* is explicit loop prevention necessary? */ 1203 struct ip6_ext *ip6e = NULL; 1204 int elen; 1205 struct mbuf *ext = NULL; 1206 1207 /* 1208 * if it is not an extension header, don't try to 1209 * pull it from the chain. 1210 */ 1211 switch (nxt) { 1212 case IPPROTO_DSTOPTS: 1213 case IPPROTO_ROUTING: 1214 case IPPROTO_HOPOPTS: 1215 case IPPROTO_AH: /* is it possible? */ 1216 break; 1217 default: 1218 goto loopend; 1219 } 1220 1221 ext = ip6_pullexthdr(m, off, nxt); 1222 if (ext == NULL) { 1223 IP6_STATINC(IP6_STAT_TOOSHORT); 1224 return; 1225 } 1226 ip6e = mtod(ext, struct ip6_ext *); 1227 if (nxt == IPPROTO_AH) 1228 elen = (ip6e->ip6e_len + 2) << 2; 1229 else 1230 elen = (ip6e->ip6e_len + 1) << 3; 1231 if (elen != ext->m_len) { 1232 m_freem(ext); 1233 IP6_STATINC(IP6_STAT_TOOSHORT); 1234 return; 1235 } 1236 KASSERT(IP6_HDR_ALIGNED_P(ip6e)); 1237 1238 switch (nxt) { 1239 case IPPROTO_DSTOPTS: 1240 if (!(in6p->in6p_flags & IN6P_DSTOPTS)) 1241 break; 1242 1243 *mp = sbcreatecontrol((void *)ip6e, elen, 1244 IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS), 1245 IPPROTO_IPV6); 1246 if (*mp) 1247 mp = &(*mp)->m_next; 1248 break; 1249 1250 case IPPROTO_ROUTING: 1251 if (!(in6p->in6p_flags & IN6P_RTHDR)) 1252 break; 1253 1254 *mp = sbcreatecontrol((void *)ip6e, elen, 1255 IS2292(IPV6_2292RTHDR, IPV6_RTHDR), 1256 IPPROTO_IPV6); 1257 if (*mp) 1258 mp = &(*mp)->m_next; 1259 break; 1260 1261 case IPPROTO_HOPOPTS: 1262 case IPPROTO_AH: /* is it possible? */ 1263 break; 1264 1265 default: 1266 /* 1267 * other cases have been filtered in the above. 1268 * none will visit this case. here we supply 1269 * the code just in case (nxt overwritten or 1270 * other cases). 1271 */ 1272 m_freem(ext); 1273 goto loopend; 1274 1275 } 1276 1277 /* proceed with the next header. */ 1278 off += elen; 1279 nxt = ip6e->ip6e_nxt; 1280 ip6e = NULL; 1281 m_freem(ext); 1282 ext = NULL; 1283 } 1284 loopend: 1285 ; 1286 } 1287 } 1288 #undef IS2292 1289 1290 1291 void 1292 ip6_notify_pmtu(struct in6pcb *in6p, const struct sockaddr_in6 *dst, 1293 uint32_t *mtu) 1294 { 1295 struct socket *so; 1296 struct mbuf *m_mtu; 1297 struct ip6_mtuinfo mtuctl; 1298 1299 so = in6p->in6p_socket; 1300 1301 if (mtu == NULL) 1302 return; 1303 1304 #ifdef DIAGNOSTIC 1305 if (so == NULL) /* I believe this is impossible */ 1306 panic("ip6_notify_pmtu: socket is NULL"); 1307 #endif 1308 1309 memset(&mtuctl, 0, sizeof(mtuctl)); /* zero-clear for safety */ 1310 mtuctl.ip6m_mtu = *mtu; 1311 mtuctl.ip6m_addr = *dst; 1312 if (sa6_recoverscope(&mtuctl.ip6m_addr)) 1313 return; 1314 1315 if ((m_mtu = sbcreatecontrol((void *)&mtuctl, sizeof(mtuctl), 1316 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL) 1317 return; 1318 1319 if (sbappendaddr(&so->so_rcv, (const struct sockaddr *)dst, NULL, m_mtu) 1320 == 0) { 1321 m_freem(m_mtu); 1322 /* XXX: should count statistics */ 1323 } else 1324 sorwakeup(so); 1325 1326 return; 1327 } 1328 1329 /* 1330 * pull single extension header from mbuf chain. returns single mbuf that 1331 * contains the result, or NULL on error. 1332 */ 1333 static struct mbuf * 1334 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt) 1335 { 1336 struct ip6_ext ip6e; 1337 size_t elen; 1338 struct mbuf *n; 1339 1340 #ifdef DIAGNOSTIC 1341 switch (nxt) { 1342 case IPPROTO_DSTOPTS: 1343 case IPPROTO_ROUTING: 1344 case IPPROTO_HOPOPTS: 1345 case IPPROTO_AH: /* is it possible? */ 1346 break; 1347 default: 1348 printf("ip6_pullexthdr: invalid nxt=%d\n", nxt); 1349 } 1350 #endif 1351 1352 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1353 if (nxt == IPPROTO_AH) 1354 elen = (ip6e.ip6e_len + 2) << 2; 1355 else 1356 elen = (ip6e.ip6e_len + 1) << 3; 1357 1358 MGET(n, M_DONTWAIT, MT_DATA); 1359 if (n && elen >= MLEN) { 1360 MCLGET(n, M_DONTWAIT); 1361 if ((n->m_flags & M_EXT) == 0) { 1362 m_free(n); 1363 n = NULL; 1364 } 1365 } 1366 if (!n) 1367 return NULL; 1368 1369 n->m_len = 0; 1370 if (elen >= M_TRAILINGSPACE(n)) { 1371 m_free(n); 1372 return NULL; 1373 } 1374 1375 m_copydata(m, off, elen, mtod(n, void *)); 1376 n->m_len = elen; 1377 return n; 1378 } 1379 1380 /* 1381 * Get pointer to the previous header followed by the header 1382 * currently processed. 1383 * XXX: This function supposes that 1384 * M includes all headers, 1385 * the next header field and the header length field of each header 1386 * are valid, and 1387 * the sum of each header length equals to OFF. 1388 * Because of these assumptions, this function must be called very 1389 * carefully. Moreover, it will not be used in the near future when 1390 * we develop `neater' mechanism to process extension headers. 1391 */ 1392 u_int8_t * 1393 ip6_get_prevhdr(struct mbuf *m, int off) 1394 { 1395 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1396 1397 if (off == sizeof(struct ip6_hdr)) 1398 return (&ip6->ip6_nxt); 1399 else { 1400 int len, nxt; 1401 struct ip6_ext *ip6e = NULL; 1402 1403 nxt = ip6->ip6_nxt; 1404 len = sizeof(struct ip6_hdr); 1405 while (len < off) { 1406 ip6e = (struct ip6_ext *)(mtod(m, char *) + len); 1407 1408 switch (nxt) { 1409 case IPPROTO_FRAGMENT: 1410 len += sizeof(struct ip6_frag); 1411 break; 1412 case IPPROTO_AH: 1413 len += (ip6e->ip6e_len + 2) << 2; 1414 break; 1415 default: 1416 len += (ip6e->ip6e_len + 1) << 3; 1417 break; 1418 } 1419 nxt = ip6e->ip6e_nxt; 1420 } 1421 if (ip6e) 1422 return (&ip6e->ip6e_nxt); 1423 else 1424 return NULL; 1425 } 1426 } 1427 1428 /* 1429 * get next header offset. m will be retained. 1430 */ 1431 int 1432 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp) 1433 { 1434 struct ip6_hdr ip6; 1435 struct ip6_ext ip6e; 1436 struct ip6_frag fh; 1437 1438 /* just in case */ 1439 if (m == NULL) 1440 panic("ip6_nexthdr: m == NULL"); 1441 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off) 1442 return -1; 1443 1444 switch (proto) { 1445 case IPPROTO_IPV6: 1446 /* do not chase beyond intermediate IPv6 headers */ 1447 if (off != 0) 1448 return -1; 1449 if (m->m_pkthdr.len < off + sizeof(ip6)) 1450 return -1; 1451 m_copydata(m, off, sizeof(ip6), (void *)&ip6); 1452 if (nxtp) 1453 *nxtp = ip6.ip6_nxt; 1454 off += sizeof(ip6); 1455 return off; 1456 1457 case IPPROTO_FRAGMENT: 1458 /* 1459 * terminate parsing if it is not the first fragment, 1460 * it does not make sense to parse through it. 1461 */ 1462 if (m->m_pkthdr.len < off + sizeof(fh)) 1463 return -1; 1464 m_copydata(m, off, sizeof(fh), (void *)&fh); 1465 if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0) 1466 return -1; 1467 if (nxtp) 1468 *nxtp = fh.ip6f_nxt; 1469 off += sizeof(struct ip6_frag); 1470 return off; 1471 1472 case IPPROTO_AH: 1473 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1474 return -1; 1475 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1476 if (nxtp) 1477 *nxtp = ip6e.ip6e_nxt; 1478 off += (ip6e.ip6e_len + 2) << 2; 1479 if (m->m_pkthdr.len < off) 1480 return -1; 1481 return off; 1482 1483 case IPPROTO_HOPOPTS: 1484 case IPPROTO_ROUTING: 1485 case IPPROTO_DSTOPTS: 1486 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1487 return -1; 1488 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1489 if (nxtp) 1490 *nxtp = ip6e.ip6e_nxt; 1491 off += (ip6e.ip6e_len + 1) << 3; 1492 if (m->m_pkthdr.len < off) 1493 return -1; 1494 return off; 1495 1496 case IPPROTO_NONE: 1497 case IPPROTO_ESP: 1498 case IPPROTO_IPCOMP: 1499 /* give up */ 1500 return -1; 1501 1502 default: 1503 return -1; 1504 } 1505 } 1506 1507 /* 1508 * get offset for the last header in the chain. m will be kept untainted. 1509 */ 1510 int 1511 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp) 1512 { 1513 int newoff; 1514 int nxt; 1515 1516 if (!nxtp) { 1517 nxt = -1; 1518 nxtp = &nxt; 1519 } 1520 for (;;) { 1521 newoff = ip6_nexthdr(m, off, proto, nxtp); 1522 if (newoff < 0) 1523 return off; 1524 else if (newoff < off) 1525 return -1; /* invalid */ 1526 else if (newoff == off) 1527 return newoff; 1528 1529 off = newoff; 1530 proto = *nxtp; 1531 } 1532 } 1533 1534 struct m_tag * 1535 ip6_addaux(struct mbuf *m) 1536 { 1537 struct m_tag *mtag; 1538 1539 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1540 if (!mtag) { 1541 mtag = m_tag_get(PACKET_TAG_INET6, sizeof(struct ip6aux), 1542 M_NOWAIT); 1543 if (mtag) { 1544 m_tag_prepend(m, mtag); 1545 memset(mtag + 1, 0, sizeof(struct ip6aux)); 1546 } 1547 } 1548 return mtag; 1549 } 1550 1551 struct m_tag * 1552 ip6_findaux(struct mbuf *m) 1553 { 1554 struct m_tag *mtag; 1555 1556 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1557 return mtag; 1558 } 1559 1560 void 1561 ip6_delaux(struct mbuf *m) 1562 { 1563 struct m_tag *mtag; 1564 1565 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1566 if (mtag) 1567 m_tag_delete(m, mtag); 1568 } 1569 1570 /* 1571 * System control for IP6 1572 */ 1573 1574 const u_char inet6ctlerrmap[PRC_NCMDS] = { 1575 0, 0, 0, 0, 1576 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 1577 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 1578 EMSGSIZE, EHOSTUNREACH, 0, 0, 1579 0, 0, 0, 0, 1580 ENOPROTOOPT 1581 }; 1582 1583 extern int sysctl_net_inet6_addrctlpolicy(SYSCTLFN_ARGS); 1584 1585 static int 1586 sysctl_net_inet6_ip6_stats(SYSCTLFN_ARGS) 1587 { 1588 1589 return (NETSTAT_SYSCTL(ip6stat_percpu, IP6_NSTATS)); 1590 } 1591 1592 static void 1593 sysctl_net_inet6_ip6_setup(struct sysctllog **clog) 1594 { 1595 #ifdef RFC2292 1596 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y)) 1597 #else 1598 #define IS2292(x, y) (y) 1599 #endif 1600 1601 sysctl_createv(clog, 0, NULL, NULL, 1602 CTLFLAG_PERMANENT, 1603 CTLTYPE_NODE, "inet6", 1604 SYSCTL_DESCR("PF_INET6 related settings"), 1605 NULL, 0, NULL, 0, 1606 CTL_NET, PF_INET6, CTL_EOL); 1607 sysctl_createv(clog, 0, NULL, NULL, 1608 CTLFLAG_PERMANENT, 1609 CTLTYPE_NODE, "ip6", 1610 SYSCTL_DESCR("IPv6 related settings"), 1611 NULL, 0, NULL, 0, 1612 CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_EOL); 1613 1614 sysctl_createv(clog, 0, NULL, NULL, 1615 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1616 CTLTYPE_INT, "forwarding", 1617 SYSCTL_DESCR("Enable forwarding of INET6 datagrams"), 1618 NULL, 0, &ip6_forwarding, 0, 1619 CTL_NET, PF_INET6, IPPROTO_IPV6, 1620 IPV6CTL_FORWARDING, CTL_EOL); 1621 sysctl_createv(clog, 0, NULL, NULL, 1622 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1623 CTLTYPE_INT, "redirect", 1624 SYSCTL_DESCR("Enable sending of ICMPv6 redirect messages"), 1625 NULL, 0, &ip6_sendredirects, 0, 1626 CTL_NET, PF_INET6, IPPROTO_IPV6, 1627 IPV6CTL_SENDREDIRECTS, CTL_EOL); 1628 sysctl_createv(clog, 0, NULL, NULL, 1629 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1630 CTLTYPE_INT, "hlim", 1631 SYSCTL_DESCR("Hop limit for an INET6 datagram"), 1632 NULL, 0, &ip6_defhlim, 0, 1633 CTL_NET, PF_INET6, IPPROTO_IPV6, 1634 IPV6CTL_DEFHLIM, CTL_EOL); 1635 #ifdef notyet 1636 sysctl_createv(clog, 0, NULL, NULL, 1637 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1638 CTLTYPE_INT, "mtu", NULL, 1639 NULL, 0, &, 0, 1640 CTL_NET, PF_INET6, IPPROTO_IPV6, 1641 IPV6CTL_DEFMTU, CTL_EOL); 1642 #endif 1643 #ifdef __no_idea__ 1644 sysctl_createv(clog, 0, NULL, NULL, 1645 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1646 CTLTYPE_INT, "forwsrcrt", NULL, 1647 NULL, 0, &?, 0, 1648 CTL_NET, PF_INET6, IPPROTO_IPV6, 1649 IPV6CTL_FORWSRCRT, CTL_EOL); 1650 sysctl_createv(clog, 0, NULL, NULL, 1651 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1652 CTLTYPE_STRUCT, "mrtstats", NULL, 1653 NULL, 0, &?, sizeof(?), 1654 CTL_NET, PF_INET6, IPPROTO_IPV6, 1655 IPV6CTL_MRTSTATS, CTL_EOL); 1656 sysctl_createv(clog, 0, NULL, NULL, 1657 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1658 CTLTYPE_?, "mrtproto", NULL, 1659 NULL, 0, &?, sizeof(?), 1660 CTL_NET, PF_INET6, IPPROTO_IPV6, 1661 IPV6CTL_MRTPROTO, CTL_EOL); 1662 #endif 1663 sysctl_createv(clog, 0, NULL, NULL, 1664 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1665 CTLTYPE_INT, "maxfragpackets", 1666 SYSCTL_DESCR("Maximum number of fragments to buffer " 1667 "for reassembly"), 1668 NULL, 0, &ip6_maxfragpackets, 0, 1669 CTL_NET, PF_INET6, IPPROTO_IPV6, 1670 IPV6CTL_MAXFRAGPACKETS, CTL_EOL); 1671 #ifdef __no_idea__ 1672 sysctl_createv(clog, 0, NULL, NULL, 1673 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1674 CTLTYPE_INT, "sourcecheck", NULL, 1675 NULL, 0, &?, 0, 1676 CTL_NET, PF_INET6, IPPROTO_IPV6, 1677 IPV6CTL_SOURCECHECK, CTL_EOL); 1678 sysctl_createv(clog, 0, NULL, NULL, 1679 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1680 CTLTYPE_INT, "sourcecheck_logint", NULL, 1681 NULL, 0, &?, 0, 1682 CTL_NET, PF_INET6, IPPROTO_IPV6, 1683 IPV6CTL_SOURCECHECK_LOGINT, CTL_EOL); 1684 #endif 1685 sysctl_createv(clog, 0, NULL, NULL, 1686 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1687 CTLTYPE_INT, "accept_rtadv", 1688 SYSCTL_DESCR("Accept router advertisements"), 1689 NULL, 0, &ip6_accept_rtadv, 0, 1690 CTL_NET, PF_INET6, IPPROTO_IPV6, 1691 IPV6CTL_ACCEPT_RTADV, CTL_EOL); 1692 sysctl_createv(clog, 0, NULL, NULL, 1693 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1694 CTLTYPE_INT, "rtadv_maxroutes", 1695 SYSCTL_DESCR("Maximum number of routes accepted via router advertisements"), 1696 NULL, 0, &ip6_rtadv_maxroutes, 0, 1697 CTL_NET, PF_INET6, IPPROTO_IPV6, 1698 IPV6CTL_RTADV_MAXROUTES, CTL_EOL); 1699 sysctl_createv(clog, 0, NULL, NULL, 1700 CTLFLAG_PERMANENT, 1701 CTLTYPE_INT, "rtadv_numroutes", 1702 SYSCTL_DESCR("Current number of routes accepted via router advertisements"), 1703 NULL, 0, &nd6_numroutes, 0, 1704 CTL_NET, PF_INET6, IPPROTO_IPV6, 1705 IPV6CTL_RTADV_NUMROUTES, CTL_EOL); 1706 sysctl_createv(clog, 0, NULL, NULL, 1707 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1708 CTLTYPE_INT, "keepfaith", 1709 SYSCTL_DESCR("Activate faith interface"), 1710 NULL, 0, &ip6_keepfaith, 0, 1711 CTL_NET, PF_INET6, IPPROTO_IPV6, 1712 IPV6CTL_KEEPFAITH, CTL_EOL); 1713 sysctl_createv(clog, 0, NULL, NULL, 1714 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1715 CTLTYPE_INT, "log_interval", 1716 SYSCTL_DESCR("Minumum interval between logging " 1717 "unroutable packets"), 1718 NULL, 0, &ip6_log_interval, 0, 1719 CTL_NET, PF_INET6, IPPROTO_IPV6, 1720 IPV6CTL_LOG_INTERVAL, CTL_EOL); 1721 sysctl_createv(clog, 0, NULL, NULL, 1722 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1723 CTLTYPE_INT, "hdrnestlimit", 1724 SYSCTL_DESCR("Maximum number of nested IPv6 headers"), 1725 NULL, 0, &ip6_hdrnestlimit, 0, 1726 CTL_NET, PF_INET6, IPPROTO_IPV6, 1727 IPV6CTL_HDRNESTLIMIT, CTL_EOL); 1728 sysctl_createv(clog, 0, NULL, NULL, 1729 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1730 CTLTYPE_INT, "dad_count", 1731 SYSCTL_DESCR("Number of Duplicate Address Detection " 1732 "probes to send"), 1733 NULL, 0, &ip6_dad_count, 0, 1734 CTL_NET, PF_INET6, IPPROTO_IPV6, 1735 IPV6CTL_DAD_COUNT, CTL_EOL); 1736 sysctl_createv(clog, 0, NULL, NULL, 1737 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1738 CTLTYPE_INT, "auto_flowlabel", 1739 SYSCTL_DESCR("Assign random IPv6 flow labels"), 1740 NULL, 0, &ip6_auto_flowlabel, 0, 1741 CTL_NET, PF_INET6, IPPROTO_IPV6, 1742 IPV6CTL_AUTO_FLOWLABEL, CTL_EOL); 1743 sysctl_createv(clog, 0, NULL, NULL, 1744 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1745 CTLTYPE_INT, "defmcasthlim", 1746 SYSCTL_DESCR("Default multicast hop limit"), 1747 NULL, 0, &ip6_defmcasthlim, 0, 1748 CTL_NET, PF_INET6, IPPROTO_IPV6, 1749 IPV6CTL_DEFMCASTHLIM, CTL_EOL); 1750 sysctl_createv(clog, 0, NULL, NULL, 1751 CTLFLAG_PERMANENT, 1752 CTLTYPE_STRING, "kame_version", 1753 SYSCTL_DESCR("KAME Version"), 1754 NULL, 0, __UNCONST(__KAME_VERSION), 0, 1755 CTL_NET, PF_INET6, IPPROTO_IPV6, 1756 IPV6CTL_KAME_VERSION, CTL_EOL); 1757 sysctl_createv(clog, 0, NULL, NULL, 1758 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1759 CTLTYPE_INT, "use_deprecated", 1760 SYSCTL_DESCR("Allow use of deprecated addresses as " 1761 "source addresses"), 1762 NULL, 0, &ip6_use_deprecated, 0, 1763 CTL_NET, PF_INET6, IPPROTO_IPV6, 1764 IPV6CTL_USE_DEPRECATED, CTL_EOL); 1765 sysctl_createv(clog, 0, NULL, NULL, 1766 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1767 CTLTYPE_INT, "rr_prune", NULL, 1768 NULL, 0, &ip6_rr_prune, 0, 1769 CTL_NET, PF_INET6, IPPROTO_IPV6, 1770 IPV6CTL_RR_PRUNE, CTL_EOL); 1771 sysctl_createv(clog, 0, NULL, NULL, 1772 CTLFLAG_PERMANENT 1773 #ifndef INET6_BINDV6ONLY 1774 |CTLFLAG_READWRITE, 1775 #endif 1776 CTLTYPE_INT, "v6only", 1777 SYSCTL_DESCR("Disallow PF_INET6 sockets from connecting " 1778 "to PF_INET sockets"), 1779 NULL, 0, &ip6_v6only, 0, 1780 CTL_NET, PF_INET6, IPPROTO_IPV6, 1781 IPV6CTL_V6ONLY, CTL_EOL); 1782 sysctl_createv(clog, 0, NULL, NULL, 1783 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1784 CTLTYPE_INT, "anonportmin", 1785 SYSCTL_DESCR("Lowest ephemeral port number to assign"), 1786 sysctl_net_inet_ip_ports, 0, &ip6_anonportmin, 0, 1787 CTL_NET, PF_INET6, IPPROTO_IPV6, 1788 IPV6CTL_ANONPORTMIN, CTL_EOL); 1789 sysctl_createv(clog, 0, NULL, NULL, 1790 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1791 CTLTYPE_INT, "anonportmax", 1792 SYSCTL_DESCR("Highest ephemeral port number to assign"), 1793 sysctl_net_inet_ip_ports, 0, &ip6_anonportmax, 0, 1794 CTL_NET, PF_INET6, IPPROTO_IPV6, 1795 IPV6CTL_ANONPORTMAX, CTL_EOL); 1796 #ifndef IPNOPRIVPORTS 1797 sysctl_createv(clog, 0, NULL, NULL, 1798 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1799 CTLTYPE_INT, "lowportmin", 1800 SYSCTL_DESCR("Lowest privileged ephemeral port number " 1801 "to assign"), 1802 sysctl_net_inet_ip_ports, 0, &ip6_lowportmin, 0, 1803 CTL_NET, PF_INET6, IPPROTO_IPV6, 1804 IPV6CTL_LOWPORTMIN, CTL_EOL); 1805 sysctl_createv(clog, 0, NULL, NULL, 1806 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1807 CTLTYPE_INT, "lowportmax", 1808 SYSCTL_DESCR("Highest privileged ephemeral port number " 1809 "to assign"), 1810 sysctl_net_inet_ip_ports, 0, &ip6_lowportmax, 0, 1811 CTL_NET, PF_INET6, IPPROTO_IPV6, 1812 IPV6CTL_LOWPORTMAX, CTL_EOL); 1813 #endif /* IPNOPRIVPORTS */ 1814 sysctl_createv(clog, 0, NULL, NULL, 1815 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1816 CTLTYPE_INT, "auto_linklocal", 1817 SYSCTL_DESCR("Default value of per-interface flag for " 1818 "adding an IPv6 link-local address to " 1819 "interfaces when attached"), 1820 NULL, 0, &ip6_auto_linklocal, 0, 1821 CTL_NET, PF_INET6, IPPROTO_IPV6, 1822 IPV6CTL_AUTO_LINKLOCAL, CTL_EOL); 1823 sysctl_createv(clog, 0, NULL, NULL, 1824 CTLFLAG_PERMANENT|CTLFLAG_READONLY, 1825 CTLTYPE_STRUCT, "addctlpolicy", 1826 SYSCTL_DESCR("Return the current address control" 1827 " policy"), 1828 sysctl_net_inet6_addrctlpolicy, 0, NULL, 0, 1829 CTL_NET, PF_INET6, IPPROTO_IPV6, 1830 IPV6CTL_ADDRCTLPOLICY, CTL_EOL); 1831 sysctl_createv(clog, 0, NULL, NULL, 1832 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1833 CTLTYPE_INT, "use_tempaddr", 1834 SYSCTL_DESCR("Use temporary address"), 1835 NULL, 0, &ip6_use_tempaddr, 0, 1836 CTL_NET, PF_INET6, IPPROTO_IPV6, 1837 CTL_CREATE, CTL_EOL); 1838 sysctl_createv(clog, 0, NULL, NULL, 1839 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1840 CTLTYPE_INT, "prefer_tempaddr", 1841 SYSCTL_DESCR("Prefer temporary address as source " 1842 "address"), 1843 NULL, 0, &ip6_prefer_tempaddr, 0, 1844 CTL_NET, PF_INET6, IPPROTO_IPV6, 1845 CTL_CREATE, CTL_EOL); 1846 sysctl_createv(clog, 0, NULL, NULL, 1847 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1848 CTLTYPE_INT, "temppltime", 1849 SYSCTL_DESCR("preferred lifetime of a temporary address"), 1850 NULL, 0, &ip6_temp_preferred_lifetime, 0, 1851 CTL_NET, PF_INET6, IPPROTO_IPV6, 1852 CTL_CREATE, CTL_EOL); 1853 sysctl_createv(clog, 0, NULL, NULL, 1854 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1855 CTLTYPE_INT, "tempvltime", 1856 SYSCTL_DESCR("valid lifetime of a temporary address"), 1857 NULL, 0, &ip6_temp_valid_lifetime, 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, "maxfrags", 1863 SYSCTL_DESCR("Maximum fragments in reassembly queue"), 1864 NULL, 0, &ip6_maxfrags, 0, 1865 CTL_NET, PF_INET6, IPPROTO_IPV6, 1866 IPV6CTL_MAXFRAGS, CTL_EOL); 1867 sysctl_createv(clog, 0, NULL, NULL, 1868 CTLFLAG_PERMANENT, 1869 CTLTYPE_STRUCT, "stats", 1870 SYSCTL_DESCR("IPv6 statistics"), 1871 sysctl_net_inet6_ip6_stats, 0, NULL, 0, 1872 CTL_NET, PF_INET6, IPPROTO_IPV6, 1873 IPV6CTL_STATS, CTL_EOL); 1874 sysctl_createv(clog, 0, NULL, NULL, 1875 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1876 CTLTYPE_INT, "use_defaultzone", 1877 SYSCTL_DESCR("Whether to use the default scope zones"), 1878 NULL, 0, &ip6_use_defzone, 0, 1879 CTL_NET, PF_INET6, IPPROTO_IPV6, 1880 IPV6CTL_USE_DEFAULTZONE, CTL_EOL); 1881 sysctl_createv(clog, 0, NULL, NULL, 1882 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1883 CTLTYPE_INT, "mcast_pmtu", 1884 SYSCTL_DESCR("Enable pMTU discovery for multicast packet"), 1885 NULL, 0, &ip6_mcast_pmtu, 0, 1886 CTL_NET, PF_INET6, IPPROTO_IPV6, 1887 CTL_CREATE, CTL_EOL); 1888 /* anonportalgo RFC6056 subtree */ 1889 const struct sysctlnode *portalgo_node; 1890 sysctl_createv(clog, 0, NULL, &portalgo_node, 1891 CTLFLAG_PERMANENT, 1892 CTLTYPE_NODE, "anonportalgo", 1893 SYSCTL_DESCR("Anonymous port algorithm selection (RFC 6056)"), 1894 NULL, 0, NULL, 0, 1895 CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_CREATE, CTL_EOL); 1896 sysctl_createv(clog, 0, &portalgo_node, NULL, 1897 CTLFLAG_PERMANENT, 1898 CTLTYPE_STRING, "available", 1899 SYSCTL_DESCR("available algorithms"), 1900 sysctl_portalgo_available, 0, NULL, PORTALGO_MAXLEN, 1901 CTL_CREATE, CTL_EOL); 1902 sysctl_createv(clog, 0, &portalgo_node, NULL, 1903 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1904 CTLTYPE_STRING, "selected", 1905 SYSCTL_DESCR("selected algorithm"), 1906 sysctl_portalgo_selected6, 0, NULL, PORTALGO_MAXLEN, 1907 CTL_CREATE, CTL_EOL); 1908 sysctl_createv(clog, 0, &portalgo_node, NULL, 1909 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1910 CTLTYPE_STRUCT, "reserve", 1911 SYSCTL_DESCR("bitmap of reserved ports"), 1912 sysctl_portalgo_reserve6, 0, NULL, 0, 1913 CTL_CREATE, CTL_EOL); 1914 sysctl_createv(clog, 0, NULL, NULL, 1915 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1916 CTLTYPE_INT, "neighborgcthresh", 1917 SYSCTL_DESCR("Maximum number of entries in neighbor" 1918 " cache"), 1919 NULL, 1, &ip6_neighborgcthresh, 0, 1920 CTL_NET, PF_INET6, IPPROTO_IPV6, 1921 CTL_CREATE, CTL_EOL); 1922 sysctl_createv(clog, 0, NULL, NULL, 1923 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1924 CTLTYPE_INT, "maxifprefixes", 1925 SYSCTL_DESCR("Maximum number of prefixes created by" 1926 " route advertisement per interface"), 1927 NULL, 1, &ip6_maxifprefixes, 0, 1928 CTL_NET, PF_INET6, IPPROTO_IPV6, 1929 CTL_CREATE, CTL_EOL); 1930 sysctl_createv(clog, 0, NULL, NULL, 1931 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1932 CTLTYPE_INT, "maxifdefrouters", 1933 SYSCTL_DESCR("Maximum number of default routers created" 1934 " by route advertisement per interface"), 1935 NULL, 1, &ip6_maxifdefrouters, 0, 1936 CTL_NET, PF_INET6, IPPROTO_IPV6, 1937 CTL_CREATE, CTL_EOL); 1938 sysctl_createv(clog, 0, NULL, NULL, 1939 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1940 CTLTYPE_INT, "maxdynroutes", 1941 SYSCTL_DESCR("Maximum number of routes created via" 1942 " redirect"), 1943 NULL, 1, &ip6_maxdynroutes, 0, 1944 CTL_NET, PF_INET6, IPPROTO_IPV6, 1945 CTL_CREATE, CTL_EOL); 1946 } 1947 1948 void 1949 ip6_statinc(u_int stat) 1950 { 1951 1952 KASSERT(stat < IP6_NSTATS); 1953 IP6_STATINC(stat); 1954 } 1955
Indexes created Mon Sep 22 05:09:51 GMT 2025