ip6_input.c revision 1.186
1 /* $NetBSD: ip6_input.c,v 1.186 2018/01/29 10:57:13 maxv 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 1.186 2018/01/29 10:57:13 maxv 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_net_mpsafe.h" 73 #endif 74 75 #include <sys/param.h> 76 #include <sys/systm.h> 77 #include <sys/mbuf.h> 78 #include <sys/domain.h> 79 #include <sys/protosw.h> 80 #include <sys/socket.h> 81 #include <sys/socketvar.h> 82 #include <sys/errno.h> 83 #include <sys/time.h> 84 #include <sys/kernel.h> 85 #include <sys/syslog.h> 86 #include <sys/proc.h> 87 #include <sys/sysctl.h> 88 #include <sys/cprng.h> 89 #include <sys/percpu.h> 90 91 #include <net/if.h> 92 #include <net/if_types.h> 93 #include <net/if_dl.h> 94 #include <net/route.h> 95 #include <net/pktqueue.h> 96 #include <net/pfil.h> 97 98 #include <netinet/in.h> 99 #include <netinet/in_systm.h> 100 #ifdef INET 101 #include <netinet/ip.h> 102 #include <netinet/ip_var.h> 103 #include <netinet/ip_icmp.h> 104 #endif /* INET */ 105 #include <netinet/ip6.h> 106 #include <netinet/portalgo.h> 107 #include <netinet6/in6_var.h> 108 #include <netinet6/ip6_var.h> 109 #include <netinet6/ip6_private.h> 110 #include <netinet6/in6_pcb.h> 111 #include <netinet/icmp6.h> 112 #include <netinet6/scope6_var.h> 113 #include <netinet6/in6_ifattach.h> 114 #include <netinet6/nd6.h> 115 116 #ifdef IPSEC 117 #include <netipsec/ipsec.h> 118 #include <netipsec/ipsec6.h> 119 #include <netipsec/key.h> 120 #endif /* IPSEC */ 121 122 #include <netinet6/ip6protosw.h> 123 124 #include "faith.h" 125 126 #include <net/net_osdep.h> 127 128 extern struct domain inet6domain; 129 130 u_char ip6_protox[IPPROTO_MAX]; 131 pktqueue_t *ip6_pktq __read_mostly; 132 133 pfil_head_t *inet6_pfil_hook; 134 135 percpu_t *ip6stat_percpu; 136 137 percpu_t *ip6_forward_rt_percpu __cacheline_aligned; 138 139 static void ip6_init2(void); 140 static void ip6intr(void *); 141 static struct m_tag *ip6_setdstifaddr(struct mbuf *, const struct in6_ifaddr *); 142 143 static int ip6_process_hopopts(struct mbuf *, u_int8_t *, int, u_int32_t *, 144 u_int32_t *); 145 static struct mbuf *ip6_pullexthdr(struct mbuf *, size_t, int); 146 static void sysctl_net_inet6_ip6_setup(struct sysctllog **); 147 148 #ifdef NET_MPSAFE 149 #define SOFTNET_LOCK() mutex_enter(softnet_lock) 150 #define SOFTNET_UNLOCK() mutex_exit(softnet_lock) 151 #else 152 #define SOFTNET_LOCK() KASSERT(mutex_owned(softnet_lock)) 153 #define SOFTNET_UNLOCK() KASSERT(mutex_owned(softnet_lock)) 154 #endif 155 156 /* 157 * IP6 initialization: fill in IP6 protocol switch table. 158 * All protocols not implemented in kernel go to raw IP6 protocol handler. 159 */ 160 void 161 ip6_init(void) 162 { 163 const struct ip6protosw *pr; 164 int i; 165 166 in6_init(); 167 168 sysctl_net_inet6_ip6_setup(NULL); 169 pr = (const struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 170 if (pr == 0) 171 panic("ip6_init"); 172 for (i = 0; i < IPPROTO_MAX; i++) 173 ip6_protox[i] = pr - inet6sw; 174 for (pr = (const struct ip6protosw *)inet6domain.dom_protosw; 175 pr < (const struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++) 176 if (pr->pr_domain->dom_family == PF_INET6 && 177 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) 178 ip6_protox[pr->pr_protocol] = pr - inet6sw; 179 180 ip6_pktq = pktq_create(IFQ_MAXLEN, ip6intr, NULL); 181 KASSERT(ip6_pktq != NULL); 182 183 scope6_init(); 184 addrsel_policy_init(); 185 nd6_init(); 186 frag6_init(); 187 ip6_desync_factor = cprng_fast32() % MAX_TEMP_DESYNC_FACTOR; 188 189 ip6_init2(); 190 #ifdef GATEWAY 191 ip6flow_init(ip6_hashsize); 192 #endif 193 /* Register our Packet Filter hook. */ 194 inet6_pfil_hook = pfil_head_create(PFIL_TYPE_AF, (void *)AF_INET6); 195 KASSERT(inet6_pfil_hook != NULL); 196 197 ip6stat_percpu = percpu_alloc(sizeof(uint64_t) * IP6_NSTATS); 198 ip6_forward_rt_percpu = percpu_alloc(sizeof(struct route)); 199 } 200 201 static void 202 ip6_init2(void) 203 { 204 205 /* timer for regeneration of temporary addresses randomize ID */ 206 callout_init(&in6_tmpaddrtimer_ch, CALLOUT_MPSAFE); 207 callout_reset(&in6_tmpaddrtimer_ch, 208 (ip6_temp_preferred_lifetime - ip6_desync_factor - 209 ip6_temp_regen_advance) * hz, 210 in6_tmpaddrtimer, NULL); 211 } 212 213 /* 214 * IP6 input interrupt handling. Just pass the packet to ip6_input. 215 */ 216 static void 217 ip6intr(void *arg __unused) 218 { 219 struct mbuf *m; 220 221 SOFTNET_LOCK_UNLESS_NET_MPSAFE(); 222 while ((m = pktq_dequeue(ip6_pktq)) != NULL) { 223 struct psref psref; 224 struct ifnet *rcvif = m_get_rcvif_psref(m, &psref); 225 226 if (rcvif == NULL) { 227 m_freem(m); 228 continue; 229 } 230 /* 231 * Drop the packet if IPv6 is disabled on the interface. 232 */ 233 if ((ND_IFINFO(rcvif)->flags & ND6_IFF_IFDISABLED)) { 234 m_put_rcvif_psref(rcvif, &psref); 235 m_freem(m); 236 continue; 237 } 238 ip6_input(m, rcvif); 239 m_put_rcvif_psref(rcvif, &psref); 240 } 241 SOFTNET_UNLOCK_UNLESS_NET_MPSAFE(); 242 } 243 244 void 245 ip6_input(struct mbuf *m, struct ifnet *rcvif) 246 { 247 struct ip6_hdr *ip6; 248 int hit, off = sizeof(struct ip6_hdr), nest; 249 u_int32_t plen; 250 u_int32_t rtalert = ~0; 251 int nxt, ours = 0, rh_present = 0; 252 struct ifnet *deliverifp = NULL; 253 int srcrt = 0; 254 struct rtentry *rt = NULL; 255 union { 256 struct sockaddr dst; 257 struct sockaddr_in6 dst6; 258 } u; 259 struct route *ro; 260 261 KASSERT(rcvif != NULL); 262 263 /* 264 * make sure we don't have onion peering information into m_tag. 265 */ 266 ip6_delaux(m); 267 268 /* 269 * mbuf statistics 270 */ 271 if (m->m_flags & M_EXT) { 272 if (m->m_next) 273 IP6_STATINC(IP6_STAT_MEXT2M); 274 else 275 IP6_STATINC(IP6_STAT_MEXT1); 276 } else { 277 #define M2MMAX 32 278 if (m->m_next) { 279 if (m->m_flags & M_LOOP) 280 /*XXX*/ IP6_STATINC(IP6_STAT_M2M + lo0ifp->if_index); 281 else if (rcvif->if_index < M2MMAX) 282 IP6_STATINC(IP6_STAT_M2M + rcvif->if_index); 283 else 284 IP6_STATINC(IP6_STAT_M2M); 285 } else 286 IP6_STATINC(IP6_STAT_M1); 287 #undef M2MMAX 288 } 289 290 in6_ifstat_inc(rcvif, ifs6_in_receive); 291 IP6_STATINC(IP6_STAT_TOTAL); 292 293 /* 294 * If the IPv6 header is not aligned, slurp it up into a new 295 * mbuf with space for link headers, in the event we forward 296 * it. Otherwise, if it is aligned, make sure the entire base 297 * IPv6 header is in the first mbuf of the chain. 298 */ 299 if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 300 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 301 (max_linkhdr + 3) & ~3)) == NULL) { 302 /* XXXJRT new stat, please */ 303 IP6_STATINC(IP6_STAT_TOOSMALL); 304 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 305 return; 306 } 307 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 308 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 309 IP6_STATINC(IP6_STAT_TOOSMALL); 310 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 311 return; 312 } 313 } 314 315 ip6 = mtod(m, struct ip6_hdr *); 316 317 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 318 IP6_STATINC(IP6_STAT_BADVERS); 319 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 320 goto bad; 321 } 322 323 /* 324 * Assume that we can create a fast-forward IP flow entry 325 * based on this packet. 326 */ 327 m->m_flags |= M_CANFASTFWD; 328 329 /* 330 * Run through list of hooks for input packets. If there are any 331 * filters which require that additional packets in the flow are 332 * not fast-forwarded, they must clear the M_CANFASTFWD flag. 333 * Note that filters must _never_ set this flag, as another filter 334 * in the list may have previously cleared it. 335 */ 336 /* 337 * let ipfilter look at packet on the wire, 338 * not the decapsulated packet. 339 */ 340 #if defined(IPSEC) 341 if (!ipsec_used || !ipsec_indone(m)) 342 #else 343 if (1) 344 #endif 345 { 346 struct in6_addr odst; 347 348 odst = ip6->ip6_dst; 349 if (pfil_run_hooks(inet6_pfil_hook, &m, rcvif, PFIL_IN) != 0) 350 return; 351 if (m == NULL) 352 return; 353 ip6 = mtod(m, struct ip6_hdr *); 354 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst); 355 } 356 357 IP6_STATINC(IP6_STAT_NXTHIST + ip6->ip6_nxt); 358 359 #ifdef ALTQ 360 if (altq_input != NULL) { 361 SOFTNET_LOCK(); 362 if ((*altq_input)(m, AF_INET6) == 0) { 363 SOFTNET_UNLOCK(); 364 /* packet is dropped by traffic conditioner */ 365 return; 366 } 367 SOFTNET_UNLOCK(); 368 } 369 #endif 370 371 /* 372 * Check against address spoofing/corruption. 373 */ 374 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) || 375 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) { 376 /* 377 * XXX: "badscope" is not very suitable for a multicast source. 378 */ 379 IP6_STATINC(IP6_STAT_BADSCOPE); 380 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 381 goto bad; 382 } 383 384 /* 385 * The following check is not documented in specs. A malicious 386 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack 387 * and bypass security checks (act as if it was from 127.0.0.1 by using 388 * IPv6 src ::ffff:127.0.0.1). Be cautious. 389 * 390 * This check chokes if we are in an SIIT cloud. As none of BSDs 391 * support IPv4-less kernel compilation, we cannot support SIIT 392 * environment at all. So, it makes more sense for us to reject any 393 * malicious packets for non-SIIT environment, than try to do a 394 * partial support for SIIT environment. 395 */ 396 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 397 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 398 IP6_STATINC(IP6_STAT_BADSCOPE); 399 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 400 goto bad; 401 } 402 403 #if 0 404 /* 405 * Reject packets with IPv4 compatible addresses (auto tunnel). 406 * 407 * The code forbids auto tunnel relay case in RFC1933 (the check is 408 * stronger than RFC1933). We may want to re-enable it if mech-xx 409 * is revised to forbid relaying case. 410 */ 411 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) || 412 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) { 413 IP6_STATINC(IP6_STAT_BADSCOPE); 414 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 415 goto bad; 416 } 417 #endif 418 419 /* 420 * Disambiguate address scope zones (if there is ambiguity). 421 * We first make sure that the original source or destination address 422 * is not in our internal form for scoped addresses. Such addresses 423 * are not necessarily invalid spec-wise, but we cannot accept them due 424 * to the usage conflict. 425 * in6_setscope() then also checks and rejects the cases where src or 426 * dst are the loopback address and the receiving interface 427 * is not loopback. 428 */ 429 if (__predict_false( 430 m_makewritable(&m, 0, sizeof(struct ip6_hdr), M_DONTWAIT))) 431 goto bad; 432 ip6 = mtod(m, struct ip6_hdr *); 433 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) { 434 IP6_STATINC(IP6_STAT_BADSCOPE); /* XXX */ 435 goto bad; 436 } 437 if (in6_setscope(&ip6->ip6_src, rcvif, NULL) || 438 in6_setscope(&ip6->ip6_dst, rcvif, NULL)) { 439 IP6_STATINC(IP6_STAT_BADSCOPE); 440 goto bad; 441 } 442 443 ro = percpu_getref(ip6_forward_rt_percpu); 444 445 /* 446 * Multicast check 447 */ 448 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 449 bool ingroup; 450 451 in6_ifstat_inc(rcvif, ifs6_in_mcast); 452 /* 453 * See if we belong to the destination multicast group on the 454 * arrival interface. 455 */ 456 ingroup = in6_multi_group(&ip6->ip6_dst, rcvif); 457 if (ingroup) { 458 ours = 1; 459 } else if (!ip6_mrouter) { 460 uint64_t *ip6s = IP6_STAT_GETREF(); 461 ip6s[IP6_STAT_NOTMEMBER]++; 462 ip6s[IP6_STAT_CANTFORWARD]++; 463 IP6_STAT_PUTREF(); 464 in6_ifstat_inc(rcvif, ifs6_in_discard); 465 goto bad_unref; 466 } 467 deliverifp = rcvif; 468 goto hbhcheck; 469 } 470 471 sockaddr_in6_init(&u.dst6, &ip6->ip6_dst, 0, 0, 0); 472 473 /* 474 * Unicast check 475 */ 476 rt = rtcache_lookup2(ro, &u.dst, 1, &hit); 477 if (hit) 478 IP6_STATINC(IP6_STAT_FORWARD_CACHEHIT); 479 else 480 IP6_STATINC(IP6_STAT_FORWARD_CACHEMISS); 481 482 /* 483 * Accept the packet if the forwarding interface to the destination 484 * (according to the routing table) is the loopback interface, 485 * unless the associated route has a gateway. 486 * 487 * We don't explicitly match ip6_dst against an interface here. It 488 * is already done in rtcache_lookup2: rt->rt_ifp->if_type will be 489 * IFT_LOOP if the packet is for us. 490 * 491 * Note that this approach causes to accept a packet if there is a 492 * route to the loopback interface for the destination of the packet. 493 * But we think it's even useful in some situations, e.g. when using 494 * a special daemon which wants to intercept the packet. 495 */ 496 if (rt != NULL && 497 (rt->rt_flags & (RTF_HOST|RTF_GATEWAY)) == RTF_HOST && 498 rt->rt_ifp->if_type == IFT_LOOP) { 499 struct in6_ifaddr *ia6 = (struct in6_ifaddr *)rt->rt_ifa; 500 int addrok; 501 502 if (ia6->ia6_flags & IN6_IFF_ANYCAST) 503 m->m_flags |= M_ANYCAST6; 504 /* 505 * packets to a tentative, duplicated, or somehow invalid 506 * address must not be accepted. 507 */ 508 if (ia6->ia6_flags & IN6_IFF_NOTREADY) 509 addrok = 0; 510 else if (ia6->ia6_flags & IN6_IFF_DETACHED && 511 !IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) 512 { 513 /* Allow internal traffic to DETACHED addresses */ 514 struct sockaddr_in6 sin6; 515 int s; 516 517 memset(&sin6, 0, sizeof(sin6)); 518 sin6.sin6_family = AF_INET6; 519 sin6.sin6_len = sizeof(sin6); 520 sin6.sin6_addr = ip6->ip6_src; 521 s = pserialize_read_enter(); 522 addrok = (ifa_ifwithaddr(sin6tosa(&sin6)) != NULL); 523 pserialize_read_exit(s); 524 } else 525 addrok = 1; 526 if (addrok) { 527 /* this address is ready */ 528 ours = 1; 529 deliverifp = ia6->ia_ifp; /* correct? */ 530 goto hbhcheck; 531 } else { 532 /* address is not ready, so discard the packet. */ 533 char ip6bufs[INET6_ADDRSTRLEN]; 534 char ip6bufd[INET6_ADDRSTRLEN]; 535 nd6log(LOG_INFO, "packet to an unready address %s->%s\n", 536 IN6_PRINT(ip6bufs, &ip6->ip6_src), 537 IN6_PRINT(ip6bufd, &ip6->ip6_dst)); 538 539 goto bad_unref; 540 } 541 } 542 543 /* 544 * FAITH (Firewall Aided Internet Translator) 545 */ 546 #if defined(NFAITH) && 0 < NFAITH 547 if (ip6_keepfaith) { 548 if (rt != NULL && rt->rt_ifp != NULL && 549 rt->rt_ifp->if_type == IFT_FAITH) { 550 /* XXX do we need more sanity checks? */ 551 ours = 1; 552 deliverifp = rt->rt_ifp; /* faith */ 553 goto hbhcheck; 554 } 555 } 556 #endif 557 558 /* 559 * Now there is no reason to process the packet if it's not our own 560 * and we're not a router. 561 */ 562 if (!ip6_forwarding) { 563 IP6_STATINC(IP6_STAT_CANTFORWARD); 564 in6_ifstat_inc(rcvif, ifs6_in_discard); 565 goto bad_unref; 566 } 567 568 hbhcheck: 569 /* 570 * Record address information into m_tag, if we don't have one yet. 571 * Note that we are unable to record it, if the address is not listed 572 * as our interface address (e.g. multicast addresses, addresses 573 * within FAITH prefixes and such). 574 */ 575 if (deliverifp && ip6_getdstifaddr(m) == NULL) { 576 struct in6_ifaddr *ia6; 577 int s = pserialize_read_enter(); 578 579 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 580 /* Depends on ip6_setdstifaddr never sleep */ 581 if (ia6 != NULL && ip6_setdstifaddr(m, ia6) == NULL) { 582 /* 583 * XXX maybe we should drop the packet here, 584 * as we could not provide enough information 585 * to the upper layers. 586 */ 587 } 588 pserialize_read_exit(s); 589 } 590 591 /* 592 * Process Hop-by-Hop options header if it's contained. 593 * m may be modified in ip6_hopopts_input(). 594 * If a JumboPayload option is included, plen will also be modified. 595 */ 596 plen = (u_int32_t)ntohs(ip6->ip6_plen); 597 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 598 struct ip6_hbh *hbh; 599 600 if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) { 601 /* m already freed */ 602 in6_ifstat_inc(rcvif, ifs6_in_discard); 603 rtcache_unref(rt, ro); 604 percpu_putref(ip6_forward_rt_percpu); 605 return; 606 } 607 608 /* adjust pointer */ 609 ip6 = mtod(m, struct ip6_hdr *); 610 611 /* 612 * if the payload length field is 0 and the next header field 613 * indicates Hop-by-Hop Options header, then a Jumbo Payload 614 * option MUST be included. 615 */ 616 if (ip6->ip6_plen == 0 && plen == 0) { 617 /* 618 * Note that if a valid jumbo payload option is 619 * contained, ip6_hopopts_input() must set a valid 620 * (non-zero) payload length to the variable plen. 621 */ 622 IP6_STATINC(IP6_STAT_BADOPTIONS); 623 in6_ifstat_inc(rcvif, ifs6_in_discard); 624 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 625 icmp6_error(m, ICMP6_PARAM_PROB, 626 ICMP6_PARAMPROB_HEADER, 627 (char *)&ip6->ip6_plen - (char *)ip6); 628 rtcache_unref(rt, ro); 629 percpu_putref(ip6_forward_rt_percpu); 630 return; 631 } 632 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 633 sizeof(struct ip6_hbh)); 634 if (hbh == NULL) { 635 IP6_STATINC(IP6_STAT_TOOSHORT); 636 rtcache_unref(rt, ro); 637 percpu_putref(ip6_forward_rt_percpu); 638 return; 639 } 640 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 641 nxt = hbh->ip6h_nxt; 642 643 /* 644 * accept the packet if a router alert option is included 645 * and we act as an IPv6 router. 646 */ 647 if (rtalert != ~0 && ip6_forwarding) 648 ours = 1; 649 } else 650 nxt = ip6->ip6_nxt; 651 652 /* 653 * Check that the amount of data in the buffers is at least much as 654 * the IPv6 header would have us expect. Trim mbufs if longer than we 655 * expect. Drop packet if shorter than we expect. 656 */ 657 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 658 IP6_STATINC(IP6_STAT_TOOSHORT); 659 in6_ifstat_inc(rcvif, ifs6_in_truncated); 660 goto bad_unref; 661 } 662 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 663 if (m->m_len == m->m_pkthdr.len) { 664 m->m_len = sizeof(struct ip6_hdr) + plen; 665 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 666 } else 667 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 668 } 669 670 /* 671 * Forward if desirable. 672 */ 673 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 674 /* 675 * If we are acting as a multicast router, all 676 * incoming multicast packets are passed to the 677 * kernel-level multicast forwarding function. 678 * The packet is returned (relatively) intact; if 679 * ip6_mforward() returns a non-zero value, the packet 680 * must be discarded, else it may be accepted below. 681 */ 682 if (ip6_mrouter != NULL) { 683 int error; 684 685 SOFTNET_LOCK(); 686 error = ip6_mforward(ip6, rcvif, m); 687 SOFTNET_UNLOCK(); 688 689 if (error != 0) { 690 rtcache_unref(rt, ro); 691 percpu_putref(ip6_forward_rt_percpu); 692 IP6_STATINC(IP6_STAT_CANTFORWARD); 693 goto bad; 694 } 695 } 696 if (!ours) 697 goto bad_unref; 698 } else if (!ours) { 699 rtcache_unref(rt, ro); 700 percpu_putref(ip6_forward_rt_percpu); 701 ip6_forward(m, srcrt); 702 return; 703 } 704 705 ip6 = mtod(m, struct ip6_hdr *); 706 707 /* 708 * Malicious party may be able to use IPv4 mapped addr to confuse 709 * tcp/udp stack and bypass security checks (act as if it was from 710 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious. 711 * 712 * For SIIT end node behavior, you may want to disable the check. 713 * However, you will become vulnerable to attacks using IPv4 mapped 714 * source. 715 */ 716 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 717 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 718 IP6_STATINC(IP6_STAT_BADSCOPE); 719 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 720 goto bad_unref; 721 } 722 723 #ifdef IFA_STATS 724 if (deliverifp != NULL) { 725 struct in6_ifaddr *ia6; 726 int s = pserialize_read_enter(); 727 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 728 if (ia6) 729 ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len; 730 pserialize_read_exit(s); 731 } 732 #endif 733 IP6_STATINC(IP6_STAT_DELIVERED); 734 in6_ifstat_inc(deliverifp, ifs6_in_deliver); 735 nest = 0; 736 737 if (rt != NULL) { 738 rtcache_unref(rt, ro); 739 rt = NULL; 740 } 741 percpu_putref(ip6_forward_rt_percpu); 742 743 rh_present = 0; 744 while (nxt != IPPROTO_DONE) { 745 if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) { 746 IP6_STATINC(IP6_STAT_TOOMANYHDR); 747 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 748 goto bad; 749 } 750 751 /* 752 * protection against faulty packet - there should be 753 * more sanity checks in header chain processing. 754 */ 755 if (m->m_pkthdr.len < off) { 756 IP6_STATINC(IP6_STAT_TOOSHORT); 757 in6_ifstat_inc(rcvif, ifs6_in_truncated); 758 goto bad; 759 } 760 761 if (nxt == IPPROTO_ROUTING) { 762 if (rh_present++) { 763 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 764 IP6_STATINC(IP6_STAT_BADOPTIONS); 765 goto bad; 766 } 767 } 768 769 #ifdef IPSEC 770 if (ipsec_used) { 771 /* 772 * Enforce IPsec policy checking if we are seeing last 773 * header. Note that we do not visit this with 774 * protocols with pcb layer code - like udp/tcp/raw ip. 775 */ 776 if ((inet6sw[ip_protox[nxt]].pr_flags 777 & PR_LASTHDR) != 0) { 778 int error; 779 780 error = ipsec6_input(m); 781 if (error) 782 goto bad; 783 } 784 } 785 #endif 786 787 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt); 788 } 789 return; 790 791 bad_unref: 792 rtcache_unref(rt, ro); 793 percpu_putref(ip6_forward_rt_percpu); 794 bad: 795 m_freem(m); 796 return; 797 } 798 799 /* 800 * set/grab in6_ifaddr correspond to IPv6 destination address. 801 */ 802 static struct m_tag * 803 ip6_setdstifaddr(struct mbuf *m, const struct in6_ifaddr *ia) 804 { 805 struct m_tag *mtag; 806 struct ip6aux *ip6a; 807 808 mtag = ip6_addaux(m); 809 if (mtag == NULL) 810 return NULL; 811 812 ip6a = (struct ip6aux *)(mtag + 1); 813 if (in6_setscope(&ip6a->ip6a_src, ia->ia_ifp, &ip6a->ip6a_scope_id)) { 814 IP6_STATINC(IP6_STAT_BADSCOPE); 815 return NULL; 816 } 817 818 ip6a->ip6a_src = ia->ia_addr.sin6_addr; 819 ip6a->ip6a_flags = ia->ia6_flags; 820 return mtag; 821 } 822 823 const struct ip6aux * 824 ip6_getdstifaddr(struct mbuf *m) 825 { 826 struct m_tag *mtag; 827 828 mtag = ip6_findaux(m); 829 if (mtag != NULL) 830 return (struct ip6aux *)(mtag + 1); 831 else 832 return NULL; 833 } 834 835 /* 836 * Hop-by-Hop options header processing. If a valid jumbo payload option is 837 * included, the real payload length will be stored in plenp. 838 * 839 * rtalertp - XXX: should be stored more smart way 840 */ 841 int 842 ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp, 843 struct mbuf **mp, int *offp) 844 { 845 struct mbuf *m = *mp; 846 int off = *offp, hbhlen; 847 struct ip6_hbh *hbh; 848 849 /* validation of the length of the header */ 850 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, 851 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh)); 852 if (hbh == NULL) { 853 IP6_STATINC(IP6_STAT_TOOSHORT); 854 return -1; 855 } 856 hbhlen = (hbh->ip6h_len + 1) << 3; 857 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 858 hbhlen); 859 if (hbh == NULL) { 860 IP6_STATINC(IP6_STAT_TOOSHORT); 861 return -1; 862 } 863 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 864 off += hbhlen; 865 hbhlen -= sizeof(struct ip6_hbh); 866 867 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 868 hbhlen, rtalertp, plenp) < 0) 869 return (-1); 870 871 *offp = off; 872 *mp = m; 873 return (0); 874 } 875 876 /* 877 * Search header for all Hop-by-hop options and process each option. 878 * This function is separate from ip6_hopopts_input() in order to 879 * handle a case where the sending node itself process its hop-by-hop 880 * options header. In such a case, the function is called from ip6_output(). 881 * 882 * The function assumes that hbh header is located right after the IPv6 header 883 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to 884 * opthead + hbhlen is located in continuous memory region. 885 */ 886 static int 887 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen, 888 u_int32_t *rtalertp, u_int32_t *plenp) 889 { 890 struct ip6_hdr *ip6; 891 int optlen = 0; 892 u_int8_t *opt = opthead; 893 u_int16_t rtalert_val; 894 u_int32_t jumboplen; 895 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh); 896 897 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 898 switch (*opt) { 899 case IP6OPT_PAD1: 900 optlen = 1; 901 break; 902 case IP6OPT_PADN: 903 if (hbhlen < IP6OPT_MINLEN) { 904 IP6_STATINC(IP6_STAT_TOOSMALL); 905 goto bad; 906 } 907 optlen = *(opt + 1) + 2; 908 break; 909 case IP6OPT_RTALERT: 910 /* XXX may need check for alignment */ 911 if (hbhlen < IP6OPT_RTALERT_LEN) { 912 IP6_STATINC(IP6_STAT_TOOSMALL); 913 goto bad; 914 } 915 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) { 916 /* XXX stat */ 917 icmp6_error(m, ICMP6_PARAM_PROB, 918 ICMP6_PARAMPROB_HEADER, 919 erroff + opt + 1 - opthead); 920 return (-1); 921 } 922 optlen = IP6OPT_RTALERT_LEN; 923 memcpy((void *)&rtalert_val, (void *)(opt + 2), 2); 924 *rtalertp = ntohs(rtalert_val); 925 break; 926 case IP6OPT_JUMBO: 927 /* XXX may need check for alignment */ 928 if (hbhlen < IP6OPT_JUMBO_LEN) { 929 IP6_STATINC(IP6_STAT_TOOSMALL); 930 goto bad; 931 } 932 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) { 933 /* XXX stat */ 934 icmp6_error(m, ICMP6_PARAM_PROB, 935 ICMP6_PARAMPROB_HEADER, 936 erroff + opt + 1 - opthead); 937 return (-1); 938 } 939 optlen = IP6OPT_JUMBO_LEN; 940 941 /* 942 * IPv6 packets that have non 0 payload length 943 * must not contain a jumbo payload option. 944 */ 945 ip6 = mtod(m, struct ip6_hdr *); 946 if (ip6->ip6_plen) { 947 IP6_STATINC(IP6_STAT_BADOPTIONS); 948 icmp6_error(m, ICMP6_PARAM_PROB, 949 ICMP6_PARAMPROB_HEADER, 950 erroff + opt - opthead); 951 return (-1); 952 } 953 954 /* 955 * We may see jumbolen in unaligned location, so 956 * we'd need to perform bcopy(). 957 */ 958 memcpy(&jumboplen, opt + 2, sizeof(jumboplen)); 959 jumboplen = (u_int32_t)htonl(jumboplen); 960 961 #if 1 962 /* 963 * if there are multiple jumbo payload options, 964 * *plenp will be non-zero and the packet will be 965 * rejected. 966 * the behavior may need some debate in ipngwg - 967 * multiple options does not make sense, however, 968 * there's no explicit mention in specification. 969 */ 970 if (*plenp != 0) { 971 IP6_STATINC(IP6_STAT_BADOPTIONS); 972 icmp6_error(m, ICMP6_PARAM_PROB, 973 ICMP6_PARAMPROB_HEADER, 974 erroff + opt + 2 - opthead); 975 return (-1); 976 } 977 #endif 978 979 /* 980 * jumbo payload length must be larger than 65535. 981 */ 982 if (jumboplen <= IPV6_MAXPACKET) { 983 IP6_STATINC(IP6_STAT_BADOPTIONS); 984 icmp6_error(m, ICMP6_PARAM_PROB, 985 ICMP6_PARAMPROB_HEADER, 986 erroff + opt + 2 - opthead); 987 return (-1); 988 } 989 *plenp = jumboplen; 990 991 break; 992 default: /* unknown option */ 993 if (hbhlen < IP6OPT_MINLEN) { 994 IP6_STATINC(IP6_STAT_TOOSMALL); 995 goto bad; 996 } 997 optlen = ip6_unknown_opt(opt, m, 998 erroff + opt - opthead); 999 if (optlen == -1) 1000 return (-1); 1001 optlen += 2; 1002 break; 1003 } 1004 } 1005 1006 return (0); 1007 1008 bad: 1009 m_freem(m); 1010 return (-1); 1011 } 1012 1013 /* 1014 * Unknown option processing. 1015 * The third argument `off' is the offset from the IPv6 header to the option, 1016 * which is necessary if the IPv6 header the and option header and IPv6 header 1017 * is not continuous in order to return an ICMPv6 error. 1018 */ 1019 int 1020 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off) 1021 { 1022 struct ip6_hdr *ip6; 1023 1024 switch (IP6OPT_TYPE(*optp)) { 1025 case IP6OPT_TYPE_SKIP: /* ignore the option */ 1026 return ((int)*(optp + 1)); 1027 case IP6OPT_TYPE_DISCARD: /* silently discard */ 1028 m_freem(m); 1029 return (-1); 1030 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 1031 IP6_STATINC(IP6_STAT_BADOPTIONS); 1032 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 1033 return (-1); 1034 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 1035 IP6_STATINC(IP6_STAT_BADOPTIONS); 1036 ip6 = mtod(m, struct ip6_hdr *); 1037 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 1038 (m->m_flags & (M_BCAST|M_MCAST))) 1039 m_freem(m); 1040 else 1041 icmp6_error(m, ICMP6_PARAM_PROB, 1042 ICMP6_PARAMPROB_OPTION, off); 1043 return (-1); 1044 } 1045 1046 m_freem(m); /* XXX: NOTREACHED */ 1047 return (-1); 1048 } 1049 1050 /* 1051 * Create the "control" list for this pcb. 1052 * 1053 * The routine will be called from upper layer handlers like tcp6_input(). 1054 * Thus the routine assumes that the caller (tcp6_input) have already 1055 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the 1056 * very first mbuf on the mbuf chain. 1057 * We may want to add some infinite loop prevention or sanity checks for safety. 1058 * (This applies only when you are using KAME mbuf chain restriction, i.e. 1059 * you are using IP6_EXTHDR_CHECK() not m_pulldown()) 1060 */ 1061 void 1062 ip6_savecontrol(struct in6pcb *in6p, struct mbuf **mp, 1063 struct ip6_hdr *ip6, struct mbuf *m) 1064 { 1065 struct socket *so = in6p->in6p_socket; 1066 #ifdef RFC2292 1067 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y)) 1068 #else 1069 #define IS2292(x, y) (y) 1070 #endif 1071 1072 if (SOOPT_TIMESTAMP(so->so_options)) 1073 mp = sbsavetimestamp(so->so_options, m, mp); 1074 1075 /* some OSes call this logic with IPv4 packet, for SO_TIMESTAMP */ 1076 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) 1077 return; 1078 1079 /* RFC 2292 sec. 5 */ 1080 if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) { 1081 struct in6_pktinfo pi6; 1082 1083 memcpy(&pi6.ipi6_addr, &ip6->ip6_dst, sizeof(struct in6_addr)); 1084 in6_clearscope(&pi6.ipi6_addr); /* XXX */ 1085 pi6.ipi6_ifindex = m->m_pkthdr.rcvif_index; 1086 *mp = sbcreatecontrol(&pi6, sizeof(pi6), 1087 IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6); 1088 if (*mp) 1089 mp = &(*mp)->m_next; 1090 } 1091 1092 if (in6p->in6p_flags & IN6P_HOPLIMIT) { 1093 int hlim = ip6->ip6_hlim & 0xff; 1094 1095 *mp = sbcreatecontrol(&hlim, sizeof(hlim), 1096 IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6); 1097 if (*mp) 1098 mp = &(*mp)->m_next; 1099 } 1100 1101 if ((in6p->in6p_flags & IN6P_TCLASS) != 0) { 1102 u_int32_t flowinfo; 1103 int tclass; 1104 1105 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK); 1106 flowinfo >>= 20; 1107 1108 tclass = flowinfo & 0xff; 1109 *mp = sbcreatecontrol(&tclass, sizeof(tclass), 1110 IPV6_TCLASS, IPPROTO_IPV6); 1111 1112 if (*mp) 1113 mp = &(*mp)->m_next; 1114 } 1115 1116 /* 1117 * IPV6_HOPOPTS socket option. Recall that we required super-user 1118 * privilege for the option (see ip6_ctloutput), but it might be too 1119 * strict, since there might be some hop-by-hop options which can be 1120 * returned to normal user. 1121 * See also RFC3542 section 8 (or RFC2292 section 6). 1122 */ 1123 if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0) { 1124 /* 1125 * Check if a hop-by-hop options header is contatined in the 1126 * received packet, and if so, store the options as ancillary 1127 * data. Note that a hop-by-hop options header must be 1128 * just after the IPv6 header, which fact is assured through 1129 * the IPv6 input processing. 1130 */ 1131 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1132 if (xip6->ip6_nxt == IPPROTO_HOPOPTS) { 1133 struct ip6_hbh *hbh; 1134 int hbhlen; 1135 struct mbuf *ext; 1136 1137 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr), 1138 xip6->ip6_nxt); 1139 if (ext == NULL) { 1140 IP6_STATINC(IP6_STAT_TOOSHORT); 1141 return; 1142 } 1143 hbh = mtod(ext, struct ip6_hbh *); 1144 hbhlen = (hbh->ip6h_len + 1) << 3; 1145 if (hbhlen != ext->m_len) { 1146 m_freem(ext); 1147 IP6_STATINC(IP6_STAT_TOOSHORT); 1148 return; 1149 } 1150 1151 /* 1152 * XXX: We copy whole the header even if a jumbo 1153 * payload option is included, which option is to 1154 * be removed before returning in the RFC 2292. 1155 * Note: this constraint is removed in RFC3542. 1156 */ 1157 *mp = sbcreatecontrol(hbh, hbhlen, 1158 IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS), 1159 IPPROTO_IPV6); 1160 if (*mp) 1161 mp = &(*mp)->m_next; 1162 m_freem(ext); 1163 } 1164 } 1165 1166 /* IPV6_DSTOPTS and IPV6_RTHDR socket options */ 1167 if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) { 1168 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1169 int nxt = xip6->ip6_nxt, off = sizeof(struct ip6_hdr); 1170 1171 /* 1172 * Search for destination options headers or routing 1173 * header(s) through the header chain, and stores each 1174 * header as ancillary data. 1175 * Note that the order of the headers remains in 1176 * the chain of ancillary data. 1177 */ 1178 for (;;) { /* is explicit loop prevention necessary? */ 1179 struct ip6_ext *ip6e = NULL; 1180 int elen; 1181 struct mbuf *ext = NULL; 1182 1183 /* 1184 * if it is not an extension header, don't try to 1185 * pull it from the chain. 1186 */ 1187 switch (nxt) { 1188 case IPPROTO_DSTOPTS: 1189 case IPPROTO_ROUTING: 1190 case IPPROTO_HOPOPTS: 1191 case IPPROTO_AH: /* is it possible? */ 1192 break; 1193 default: 1194 goto loopend; 1195 } 1196 1197 ext = ip6_pullexthdr(m, off, nxt); 1198 if (ext == NULL) { 1199 IP6_STATINC(IP6_STAT_TOOSHORT); 1200 return; 1201 } 1202 ip6e = mtod(ext, struct ip6_ext *); 1203 if (nxt == IPPROTO_AH) 1204 elen = (ip6e->ip6e_len + 2) << 2; 1205 else 1206 elen = (ip6e->ip6e_len + 1) << 3; 1207 if (elen != ext->m_len) { 1208 m_freem(ext); 1209 IP6_STATINC(IP6_STAT_TOOSHORT); 1210 return; 1211 } 1212 KASSERT(IP6_HDR_ALIGNED_P(ip6e)); 1213 1214 switch (nxt) { 1215 case IPPROTO_DSTOPTS: 1216 if (!(in6p->in6p_flags & IN6P_DSTOPTS)) 1217 break; 1218 1219 *mp = sbcreatecontrol(ip6e, elen, 1220 IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS), 1221 IPPROTO_IPV6); 1222 if (*mp) 1223 mp = &(*mp)->m_next; 1224 break; 1225 1226 case IPPROTO_ROUTING: 1227 if (!(in6p->in6p_flags & IN6P_RTHDR)) 1228 break; 1229 1230 *mp = sbcreatecontrol(ip6e, elen, 1231 IS2292(IPV6_2292RTHDR, IPV6_RTHDR), 1232 IPPROTO_IPV6); 1233 if (*mp) 1234 mp = &(*mp)->m_next; 1235 break; 1236 1237 case IPPROTO_HOPOPTS: 1238 case IPPROTO_AH: /* is it possible? */ 1239 break; 1240 1241 default: 1242 /* 1243 * other cases have been filtered in the above. 1244 * none will visit this case. here we supply 1245 * the code just in case (nxt overwritten or 1246 * other cases). 1247 */ 1248 m_freem(ext); 1249 goto loopend; 1250 1251 } 1252 1253 /* proceed with the next header. */ 1254 off += elen; 1255 nxt = ip6e->ip6e_nxt; 1256 ip6e = NULL; 1257 m_freem(ext); 1258 ext = NULL; 1259 } 1260 loopend: 1261 ; 1262 } 1263 } 1264 #undef IS2292 1265 1266 1267 void 1268 ip6_notify_pmtu(struct in6pcb *in6p, const struct sockaddr_in6 *dst, 1269 uint32_t *mtu) 1270 { 1271 struct socket *so; 1272 struct mbuf *m_mtu; 1273 struct ip6_mtuinfo mtuctl; 1274 1275 so = in6p->in6p_socket; 1276 1277 if (mtu == NULL) 1278 return; 1279 1280 KASSERT(so != NULL); 1281 1282 memset(&mtuctl, 0, sizeof(mtuctl)); /* zero-clear for safety */ 1283 mtuctl.ip6m_mtu = *mtu; 1284 mtuctl.ip6m_addr = *dst; 1285 if (sa6_recoverscope(&mtuctl.ip6m_addr)) 1286 return; 1287 1288 if ((m_mtu = sbcreatecontrol(&mtuctl, sizeof(mtuctl), 1289 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL) 1290 return; 1291 1292 if (sbappendaddr(&so->so_rcv, (const struct sockaddr *)dst, NULL, m_mtu) 1293 == 0) { 1294 m_freem(m_mtu); 1295 /* XXX: should count statistics */ 1296 } else 1297 sorwakeup(so); 1298 1299 return; 1300 } 1301 1302 /* 1303 * pull single extension header from mbuf chain. returns single mbuf that 1304 * contains the result, or NULL on error. 1305 */ 1306 static struct mbuf * 1307 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt) 1308 { 1309 struct ip6_ext ip6e; 1310 size_t elen; 1311 struct mbuf *n; 1312 1313 #ifdef DIAGNOSTIC 1314 switch (nxt) { 1315 case IPPROTO_DSTOPTS: 1316 case IPPROTO_ROUTING: 1317 case IPPROTO_HOPOPTS: 1318 case IPPROTO_AH: /* is it possible? */ 1319 break; 1320 default: 1321 printf("ip6_pullexthdr: invalid nxt=%d\n", nxt); 1322 } 1323 #endif 1324 1325 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1326 if (nxt == IPPROTO_AH) 1327 elen = (ip6e.ip6e_len + 2) << 2; 1328 else 1329 elen = (ip6e.ip6e_len + 1) << 3; 1330 1331 MGET(n, M_DONTWAIT, MT_DATA); 1332 if (n && elen >= MLEN) { 1333 MCLGET(n, M_DONTWAIT); 1334 if ((n->m_flags & M_EXT) == 0) { 1335 m_free(n); 1336 n = NULL; 1337 } 1338 } 1339 if (!n) 1340 return NULL; 1341 1342 n->m_len = 0; 1343 if (elen >= M_TRAILINGSPACE(n)) { 1344 m_free(n); 1345 return NULL; 1346 } 1347 1348 m_copydata(m, off, elen, mtod(n, void *)); 1349 n->m_len = elen; 1350 return n; 1351 } 1352 1353 /* 1354 * Get pointer to the previous header followed by the header 1355 * currently processed. 1356 * XXX: This function supposes that 1357 * M includes all headers, 1358 * the next header field and the header length field of each header 1359 * are valid, and 1360 * the sum of each header length equals to OFF. 1361 * Because of these assumptions, this function must be called very 1362 * carefully. Moreover, it will not be used in the near future when 1363 * we develop `neater' mechanism to process extension headers. 1364 */ 1365 u_int8_t * 1366 ip6_get_prevhdr(struct mbuf *m, int off) 1367 { 1368 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1369 1370 if (off == sizeof(struct ip6_hdr)) 1371 return (&ip6->ip6_nxt); 1372 else { 1373 int len, nxt; 1374 struct ip6_ext *ip6e = NULL; 1375 1376 nxt = ip6->ip6_nxt; 1377 len = sizeof(struct ip6_hdr); 1378 while (len < off) { 1379 ip6e = (struct ip6_ext *)(mtod(m, char *) + len); 1380 1381 switch (nxt) { 1382 case IPPROTO_FRAGMENT: 1383 len += sizeof(struct ip6_frag); 1384 break; 1385 case IPPROTO_AH: 1386 len += (ip6e->ip6e_len + 2) << 2; 1387 break; 1388 default: 1389 len += (ip6e->ip6e_len + 1) << 3; 1390 break; 1391 } 1392 nxt = ip6e->ip6e_nxt; 1393 } 1394 if (ip6e) 1395 return (&ip6e->ip6e_nxt); 1396 else 1397 return NULL; 1398 } 1399 } 1400 1401 /* 1402 * get next header offset. m will be retained. 1403 */ 1404 int 1405 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp) 1406 { 1407 struct ip6_hdr ip6; 1408 struct ip6_ext ip6e; 1409 struct ip6_frag fh; 1410 1411 /* just in case */ 1412 if (m == NULL) 1413 panic("ip6_nexthdr: m == NULL"); 1414 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off) 1415 return -1; 1416 1417 switch (proto) { 1418 case IPPROTO_IPV6: 1419 /* do not chase beyond intermediate IPv6 headers */ 1420 if (off != 0) 1421 return -1; 1422 if (m->m_pkthdr.len < off + sizeof(ip6)) 1423 return -1; 1424 m_copydata(m, off, sizeof(ip6), (void *)&ip6); 1425 if (nxtp) 1426 *nxtp = ip6.ip6_nxt; 1427 off += sizeof(ip6); 1428 return off; 1429 1430 case IPPROTO_FRAGMENT: 1431 /* 1432 * terminate parsing if it is not the first fragment, 1433 * it does not make sense to parse through it. 1434 */ 1435 if (m->m_pkthdr.len < off + sizeof(fh)) 1436 return -1; 1437 m_copydata(m, off, sizeof(fh), (void *)&fh); 1438 if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0) 1439 return -1; 1440 if (nxtp) 1441 *nxtp = fh.ip6f_nxt; 1442 off += sizeof(struct ip6_frag); 1443 return off; 1444 1445 case IPPROTO_AH: 1446 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1447 return -1; 1448 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1449 if (nxtp) 1450 *nxtp = ip6e.ip6e_nxt; 1451 off += (ip6e.ip6e_len + 2) << 2; 1452 if (m->m_pkthdr.len < off) 1453 return -1; 1454 return off; 1455 1456 case IPPROTO_HOPOPTS: 1457 case IPPROTO_ROUTING: 1458 case IPPROTO_DSTOPTS: 1459 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1460 return -1; 1461 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1462 if (nxtp) 1463 *nxtp = ip6e.ip6e_nxt; 1464 off += (ip6e.ip6e_len + 1) << 3; 1465 if (m->m_pkthdr.len < off) 1466 return -1; 1467 return off; 1468 1469 case IPPROTO_NONE: 1470 case IPPROTO_ESP: 1471 case IPPROTO_IPCOMP: 1472 /* give up */ 1473 return -1; 1474 1475 default: 1476 return -1; 1477 } 1478 } 1479 1480 /* 1481 * get offset for the last header in the chain. m will be kept untainted. 1482 */ 1483 int 1484 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp) 1485 { 1486 int newoff; 1487 int nxt; 1488 1489 if (!nxtp) { 1490 nxt = -1; 1491 nxtp = &nxt; 1492 } 1493 for (;;) { 1494 newoff = ip6_nexthdr(m, off, proto, nxtp); 1495 if (newoff < 0) 1496 return off; 1497 else if (newoff < off) 1498 return -1; /* invalid */ 1499 else if (newoff == off) 1500 return newoff; 1501 1502 off = newoff; 1503 proto = *nxtp; 1504 } 1505 } 1506 1507 struct m_tag * 1508 ip6_addaux(struct mbuf *m) 1509 { 1510 struct m_tag *mtag; 1511 1512 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1513 if (!mtag) { 1514 mtag = m_tag_get(PACKET_TAG_INET6, sizeof(struct ip6aux), 1515 M_NOWAIT); 1516 if (mtag) { 1517 m_tag_prepend(m, mtag); 1518 memset(mtag + 1, 0, sizeof(struct ip6aux)); 1519 } 1520 } 1521 return mtag; 1522 } 1523 1524 struct m_tag * 1525 ip6_findaux(struct mbuf *m) 1526 { 1527 struct m_tag *mtag; 1528 1529 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1530 return mtag; 1531 } 1532 1533 void 1534 ip6_delaux(struct mbuf *m) 1535 { 1536 struct m_tag *mtag; 1537 1538 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1539 if (mtag) 1540 m_tag_delete(m, mtag); 1541 } 1542 1543 /* 1544 * System control for IP6 1545 */ 1546 1547 const u_char inet6ctlerrmap[PRC_NCMDS] = { 1548 0, 0, 0, 0, 1549 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 1550 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 1551 EMSGSIZE, EHOSTUNREACH, 0, 0, 1552 0, 0, 0, 0, 1553 ENOPROTOOPT 1554 }; 1555 1556 extern int sysctl_net_inet6_addrctlpolicy(SYSCTLFN_ARGS); 1557 1558 static int 1559 sysctl_net_inet6_ip6_stats(SYSCTLFN_ARGS) 1560 { 1561 1562 return (NETSTAT_SYSCTL(ip6stat_percpu, IP6_NSTATS)); 1563 } 1564 1565 static void 1566 sysctl_net_inet6_ip6_setup(struct sysctllog **clog) 1567 { 1568 #ifdef RFC2292 1569 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y)) 1570 #else 1571 #define IS2292(x, y) (y) 1572 #endif 1573 1574 sysctl_createv(clog, 0, NULL, NULL, 1575 CTLFLAG_PERMANENT, 1576 CTLTYPE_NODE, "inet6", 1577 SYSCTL_DESCR("PF_INET6 related settings"), 1578 NULL, 0, NULL, 0, 1579 CTL_NET, PF_INET6, CTL_EOL); 1580 sysctl_createv(clog, 0, NULL, NULL, 1581 CTLFLAG_PERMANENT, 1582 CTLTYPE_NODE, "ip6", 1583 SYSCTL_DESCR("IPv6 related settings"), 1584 NULL, 0, NULL, 0, 1585 CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_EOL); 1586 1587 sysctl_createv(clog, 0, NULL, NULL, 1588 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1589 CTLTYPE_INT, "forwarding", 1590 SYSCTL_DESCR("Enable forwarding of INET6 datagrams"), 1591 NULL, 0, &ip6_forwarding, 0, 1592 CTL_NET, PF_INET6, IPPROTO_IPV6, 1593 IPV6CTL_FORWARDING, CTL_EOL); 1594 sysctl_createv(clog, 0, NULL, NULL, 1595 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1596 CTLTYPE_INT, "redirect", 1597 SYSCTL_DESCR("Enable sending of ICMPv6 redirect messages"), 1598 NULL, 0, &ip6_sendredirects, 0, 1599 CTL_NET, PF_INET6, IPPROTO_IPV6, 1600 IPV6CTL_SENDREDIRECTS, CTL_EOL); 1601 sysctl_createv(clog, 0, NULL, NULL, 1602 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1603 CTLTYPE_INT, "hlim", 1604 SYSCTL_DESCR("Hop limit for an INET6 datagram"), 1605 NULL, 0, &ip6_defhlim, 0, 1606 CTL_NET, PF_INET6, IPPROTO_IPV6, 1607 IPV6CTL_DEFHLIM, CTL_EOL); 1608 #ifdef notyet 1609 sysctl_createv(clog, 0, NULL, NULL, 1610 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1611 CTLTYPE_INT, "mtu", NULL, 1612 NULL, 0, &, 0, 1613 CTL_NET, PF_INET6, IPPROTO_IPV6, 1614 IPV6CTL_DEFMTU, CTL_EOL); 1615 #endif 1616 #ifdef __no_idea__ 1617 sysctl_createv(clog, 0, NULL, NULL, 1618 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1619 CTLTYPE_INT, "forwsrcrt", NULL, 1620 NULL, 0, &?, 0, 1621 CTL_NET, PF_INET6, IPPROTO_IPV6, 1622 IPV6CTL_FORWSRCRT, CTL_EOL); 1623 sysctl_createv(clog, 0, NULL, NULL, 1624 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1625 CTLTYPE_STRUCT, "mrtstats", NULL, 1626 NULL, 0, &?, sizeof(?), 1627 CTL_NET, PF_INET6, IPPROTO_IPV6, 1628 IPV6CTL_MRTSTATS, CTL_EOL); 1629 sysctl_createv(clog, 0, NULL, NULL, 1630 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1631 CTLTYPE_?, "mrtproto", NULL, 1632 NULL, 0, &?, sizeof(?), 1633 CTL_NET, PF_INET6, IPPROTO_IPV6, 1634 IPV6CTL_MRTPROTO, CTL_EOL); 1635 #endif 1636 sysctl_createv(clog, 0, NULL, NULL, 1637 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1638 CTLTYPE_INT, "maxfragpackets", 1639 SYSCTL_DESCR("Maximum number of fragments to buffer " 1640 "for reassembly"), 1641 NULL, 0, &ip6_maxfragpackets, 0, 1642 CTL_NET, PF_INET6, IPPROTO_IPV6, 1643 IPV6CTL_MAXFRAGPACKETS, CTL_EOL); 1644 #ifdef __no_idea__ 1645 sysctl_createv(clog, 0, NULL, NULL, 1646 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1647 CTLTYPE_INT, "sourcecheck", NULL, 1648 NULL, 0, &?, 0, 1649 CTL_NET, PF_INET6, IPPROTO_IPV6, 1650 IPV6CTL_SOURCECHECK, CTL_EOL); 1651 sysctl_createv(clog, 0, NULL, NULL, 1652 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1653 CTLTYPE_INT, "sourcecheck_logint", NULL, 1654 NULL, 0, &?, 0, 1655 CTL_NET, PF_INET6, IPPROTO_IPV6, 1656 IPV6CTL_SOURCECHECK_LOGINT, CTL_EOL); 1657 #endif 1658 sysctl_createv(clog, 0, NULL, NULL, 1659 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1660 CTLTYPE_INT, "accept_rtadv", 1661 SYSCTL_DESCR("Accept router advertisements"), 1662 NULL, 0, &ip6_accept_rtadv, 0, 1663 CTL_NET, PF_INET6, IPPROTO_IPV6, 1664 IPV6CTL_ACCEPT_RTADV, CTL_EOL); 1665 sysctl_createv(clog, 0, NULL, NULL, 1666 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1667 CTLTYPE_INT, "rtadv_maxroutes", 1668 SYSCTL_DESCR("Maximum number of routes accepted via router advertisements"), 1669 NULL, 0, &ip6_rtadv_maxroutes, 0, 1670 CTL_NET, PF_INET6, IPPROTO_IPV6, 1671 IPV6CTL_RTADV_MAXROUTES, CTL_EOL); 1672 sysctl_createv(clog, 0, NULL, NULL, 1673 CTLFLAG_PERMANENT, 1674 CTLTYPE_INT, "rtadv_numroutes", 1675 SYSCTL_DESCR("Current number of routes accepted via router advertisements"), 1676 NULL, 0, &nd6_numroutes, 0, 1677 CTL_NET, PF_INET6, IPPROTO_IPV6, 1678 IPV6CTL_RTADV_NUMROUTES, CTL_EOL); 1679 sysctl_createv(clog, 0, NULL, NULL, 1680 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1681 CTLTYPE_INT, "keepfaith", 1682 SYSCTL_DESCR("Activate faith interface"), 1683 NULL, 0, &ip6_keepfaith, 0, 1684 CTL_NET, PF_INET6, IPPROTO_IPV6, 1685 IPV6CTL_KEEPFAITH, CTL_EOL); 1686 sysctl_createv(clog, 0, NULL, NULL, 1687 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1688 CTLTYPE_INT, "log_interval", 1689 SYSCTL_DESCR("Minumum interval between logging " 1690 "unroutable packets"), 1691 NULL, 0, &ip6_log_interval, 0, 1692 CTL_NET, PF_INET6, IPPROTO_IPV6, 1693 IPV6CTL_LOG_INTERVAL, CTL_EOL); 1694 sysctl_createv(clog, 0, NULL, NULL, 1695 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1696 CTLTYPE_INT, "hdrnestlimit", 1697 SYSCTL_DESCR("Maximum number of nested IPv6 headers"), 1698 NULL, 0, &ip6_hdrnestlimit, 0, 1699 CTL_NET, PF_INET6, IPPROTO_IPV6, 1700 IPV6CTL_HDRNESTLIMIT, CTL_EOL); 1701 sysctl_createv(clog, 0, NULL, NULL, 1702 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1703 CTLTYPE_INT, "dad_count", 1704 SYSCTL_DESCR("Number of Duplicate Address Detection " 1705 "probes to send"), 1706 NULL, 0, &ip6_dad_count, 0, 1707 CTL_NET, PF_INET6, IPPROTO_IPV6, 1708 IPV6CTL_DAD_COUNT, CTL_EOL); 1709 sysctl_createv(clog, 0, NULL, NULL, 1710 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1711 CTLTYPE_INT, "auto_flowlabel", 1712 SYSCTL_DESCR("Assign random IPv6 flow labels"), 1713 NULL, 0, &ip6_auto_flowlabel, 0, 1714 CTL_NET, PF_INET6, IPPROTO_IPV6, 1715 IPV6CTL_AUTO_FLOWLABEL, CTL_EOL); 1716 sysctl_createv(clog, 0, NULL, NULL, 1717 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1718 CTLTYPE_INT, "defmcasthlim", 1719 SYSCTL_DESCR("Default multicast hop limit"), 1720 NULL, 0, &ip6_defmcasthlim, 0, 1721 CTL_NET, PF_INET6, IPPROTO_IPV6, 1722 IPV6CTL_DEFMCASTHLIM, CTL_EOL); 1723 sysctl_createv(clog, 0, NULL, NULL, 1724 CTLFLAG_PERMANENT, 1725 CTLTYPE_STRING, "kame_version", 1726 SYSCTL_DESCR("KAME Version"), 1727 NULL, 0, __UNCONST(__KAME_VERSION), 0, 1728 CTL_NET, PF_INET6, IPPROTO_IPV6, 1729 IPV6CTL_KAME_VERSION, CTL_EOL); 1730 sysctl_createv(clog, 0, NULL, NULL, 1731 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1732 CTLTYPE_INT, "use_deprecated", 1733 SYSCTL_DESCR("Allow use of deprecated addresses as " 1734 "source addresses"), 1735 NULL, 0, &ip6_use_deprecated, 0, 1736 CTL_NET, PF_INET6, IPPROTO_IPV6, 1737 IPV6CTL_USE_DEPRECATED, CTL_EOL); 1738 sysctl_createv(clog, 0, NULL, NULL, 1739 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1740 CTLTYPE_INT, "rr_prune", NULL, 1741 NULL, 0, &ip6_rr_prune, 0, 1742 CTL_NET, PF_INET6, IPPROTO_IPV6, 1743 IPV6CTL_RR_PRUNE, CTL_EOL); 1744 sysctl_createv(clog, 0, NULL, NULL, 1745 CTLFLAG_PERMANENT 1746 #ifndef INET6_BINDV6ONLY 1747 |CTLFLAG_READWRITE, 1748 #endif 1749 CTLTYPE_INT, "v6only", 1750 SYSCTL_DESCR("Disallow PF_INET6 sockets from connecting " 1751 "to PF_INET sockets"), 1752 NULL, 0, &ip6_v6only, 0, 1753 CTL_NET, PF_INET6, IPPROTO_IPV6, 1754 IPV6CTL_V6ONLY, CTL_EOL); 1755 sysctl_createv(clog, 0, NULL, NULL, 1756 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1757 CTLTYPE_INT, "anonportmin", 1758 SYSCTL_DESCR("Lowest ephemeral port number to assign"), 1759 sysctl_net_inet_ip_ports, 0, &ip6_anonportmin, 0, 1760 CTL_NET, PF_INET6, IPPROTO_IPV6, 1761 IPV6CTL_ANONPORTMIN, CTL_EOL); 1762 sysctl_createv(clog, 0, NULL, NULL, 1763 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1764 CTLTYPE_INT, "anonportmax", 1765 SYSCTL_DESCR("Highest ephemeral port number to assign"), 1766 sysctl_net_inet_ip_ports, 0, &ip6_anonportmax, 0, 1767 CTL_NET, PF_INET6, IPPROTO_IPV6, 1768 IPV6CTL_ANONPORTMAX, CTL_EOL); 1769 #ifndef IPNOPRIVPORTS 1770 sysctl_createv(clog, 0, NULL, NULL, 1771 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1772 CTLTYPE_INT, "lowportmin", 1773 SYSCTL_DESCR("Lowest privileged ephemeral port number " 1774 "to assign"), 1775 sysctl_net_inet_ip_ports, 0, &ip6_lowportmin, 0, 1776 CTL_NET, PF_INET6, IPPROTO_IPV6, 1777 IPV6CTL_LOWPORTMIN, CTL_EOL); 1778 sysctl_createv(clog, 0, NULL, NULL, 1779 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1780 CTLTYPE_INT, "lowportmax", 1781 SYSCTL_DESCR("Highest privileged ephemeral port number " 1782 "to assign"), 1783 sysctl_net_inet_ip_ports, 0, &ip6_lowportmax, 0, 1784 CTL_NET, PF_INET6, IPPROTO_IPV6, 1785 IPV6CTL_LOWPORTMAX, CTL_EOL); 1786 #endif /* IPNOPRIVPORTS */ 1787 sysctl_createv(clog, 0, NULL, NULL, 1788 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1789 CTLTYPE_INT, "auto_linklocal", 1790 SYSCTL_DESCR("Default value of per-interface flag for " 1791 "adding an IPv6 link-local address to " 1792 "interfaces when attached"), 1793 NULL, 0, &ip6_auto_linklocal, 0, 1794 CTL_NET, PF_INET6, IPPROTO_IPV6, 1795 IPV6CTL_AUTO_LINKLOCAL, CTL_EOL); 1796 sysctl_createv(clog, 0, NULL, NULL, 1797 CTLFLAG_PERMANENT|CTLFLAG_READONLY, 1798 CTLTYPE_STRUCT, "addctlpolicy", 1799 SYSCTL_DESCR("Return the current address control" 1800 " policy"), 1801 sysctl_net_inet6_addrctlpolicy, 0, NULL, 0, 1802 CTL_NET, PF_INET6, IPPROTO_IPV6, 1803 IPV6CTL_ADDRCTLPOLICY, CTL_EOL); 1804 sysctl_createv(clog, 0, NULL, NULL, 1805 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1806 CTLTYPE_INT, "use_tempaddr", 1807 SYSCTL_DESCR("Use temporary address"), 1808 NULL, 0, &ip6_use_tempaddr, 0, 1809 CTL_NET, PF_INET6, IPPROTO_IPV6, 1810 CTL_CREATE, CTL_EOL); 1811 sysctl_createv(clog, 0, NULL, NULL, 1812 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1813 CTLTYPE_INT, "prefer_tempaddr", 1814 SYSCTL_DESCR("Prefer temporary address as source " 1815 "address"), 1816 NULL, 0, &ip6_prefer_tempaddr, 0, 1817 CTL_NET, PF_INET6, IPPROTO_IPV6, 1818 CTL_CREATE, CTL_EOL); 1819 sysctl_createv(clog, 0, NULL, NULL, 1820 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1821 CTLTYPE_INT, "temppltime", 1822 SYSCTL_DESCR("preferred lifetime of a temporary address"), 1823 NULL, 0, &ip6_temp_preferred_lifetime, 0, 1824 CTL_NET, PF_INET6, IPPROTO_IPV6, 1825 CTL_CREATE, CTL_EOL); 1826 sysctl_createv(clog, 0, NULL, NULL, 1827 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1828 CTLTYPE_INT, "tempvltime", 1829 SYSCTL_DESCR("valid lifetime of a temporary address"), 1830 NULL, 0, &ip6_temp_valid_lifetime, 0, 1831 CTL_NET, PF_INET6, IPPROTO_IPV6, 1832 CTL_CREATE, CTL_EOL); 1833 sysctl_createv(clog, 0, NULL, NULL, 1834 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1835 CTLTYPE_INT, "maxfrags", 1836 SYSCTL_DESCR("Maximum fragments in reassembly queue"), 1837 NULL, 0, &ip6_maxfrags, 0, 1838 CTL_NET, PF_INET6, IPPROTO_IPV6, 1839 IPV6CTL_MAXFRAGS, CTL_EOL); 1840 sysctl_createv(clog, 0, NULL, NULL, 1841 CTLFLAG_PERMANENT, 1842 CTLTYPE_STRUCT, "stats", 1843 SYSCTL_DESCR("IPv6 statistics"), 1844 sysctl_net_inet6_ip6_stats, 0, NULL, 0, 1845 CTL_NET, PF_INET6, IPPROTO_IPV6, 1846 IPV6CTL_STATS, CTL_EOL); 1847 sysctl_createv(clog, 0, NULL, NULL, 1848 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1849 CTLTYPE_INT, "use_defaultzone", 1850 SYSCTL_DESCR("Whether to use the default scope zones"), 1851 NULL, 0, &ip6_use_defzone, 0, 1852 CTL_NET, PF_INET6, IPPROTO_IPV6, 1853 IPV6CTL_USE_DEFAULTZONE, CTL_EOL); 1854 sysctl_createv(clog, 0, NULL, NULL, 1855 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1856 CTLTYPE_INT, "mcast_pmtu", 1857 SYSCTL_DESCR("Enable pMTU discovery for multicast packet"), 1858 NULL, 0, &ip6_mcast_pmtu, 0, 1859 CTL_NET, PF_INET6, IPPROTO_IPV6, 1860 CTL_CREATE, CTL_EOL); 1861 /* anonportalgo RFC6056 subtree */ 1862 const struct sysctlnode *portalgo_node; 1863 sysctl_createv(clog, 0, NULL, &portalgo_node, 1864 CTLFLAG_PERMANENT, 1865 CTLTYPE_NODE, "anonportalgo", 1866 SYSCTL_DESCR("Anonymous port algorithm selection (RFC 6056)"), 1867 NULL, 0, NULL, 0, 1868 CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_CREATE, CTL_EOL); 1869 sysctl_createv(clog, 0, &portalgo_node, NULL, 1870 CTLFLAG_PERMANENT, 1871 CTLTYPE_STRING, "available", 1872 SYSCTL_DESCR("available algorithms"), 1873 sysctl_portalgo_available, 0, NULL, PORTALGO_MAXLEN, 1874 CTL_CREATE, CTL_EOL); 1875 sysctl_createv(clog, 0, &portalgo_node, NULL, 1876 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1877 CTLTYPE_STRING, "selected", 1878 SYSCTL_DESCR("selected algorithm"), 1879 sysctl_portalgo_selected6, 0, NULL, PORTALGO_MAXLEN, 1880 CTL_CREATE, CTL_EOL); 1881 sysctl_createv(clog, 0, &portalgo_node, NULL, 1882 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1883 CTLTYPE_STRUCT, "reserve", 1884 SYSCTL_DESCR("bitmap of reserved ports"), 1885 sysctl_portalgo_reserve6, 0, NULL, 0, 1886 CTL_CREATE, CTL_EOL); 1887 sysctl_createv(clog, 0, NULL, NULL, 1888 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1889 CTLTYPE_INT, "neighborgcthresh", 1890 SYSCTL_DESCR("Maximum number of entries in neighbor" 1891 " cache"), 1892 NULL, 1, &ip6_neighborgcthresh, 0, 1893 CTL_NET, PF_INET6, IPPROTO_IPV6, 1894 CTL_CREATE, CTL_EOL); 1895 sysctl_createv(clog, 0, NULL, NULL, 1896 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1897 CTLTYPE_INT, "maxifprefixes", 1898 SYSCTL_DESCR("Maximum number of prefixes created by" 1899 " route advertisement per interface"), 1900 NULL, 1, &ip6_maxifprefixes, 0, 1901 CTL_NET, PF_INET6, IPPROTO_IPV6, 1902 CTL_CREATE, CTL_EOL); 1903 sysctl_createv(clog, 0, NULL, NULL, 1904 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1905 CTLTYPE_INT, "maxifdefrouters", 1906 SYSCTL_DESCR("Maximum number of default routers created" 1907 " by route advertisement per interface"), 1908 NULL, 1, &ip6_maxifdefrouters, 0, 1909 CTL_NET, PF_INET6, IPPROTO_IPV6, 1910 CTL_CREATE, CTL_EOL); 1911 sysctl_createv(clog, 0, NULL, NULL, 1912 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1913 CTLTYPE_INT, "maxdynroutes", 1914 SYSCTL_DESCR("Maximum number of routes created via" 1915 " redirect"), 1916 NULL, 1, &ip6_maxdynroutes, 0, 1917 CTL_NET, PF_INET6, IPPROTO_IPV6, 1918 CTL_CREATE, CTL_EOL); 1919 } 1920 1921 void 1922 ip6_statinc(u_int stat) 1923 { 1924 1925 KASSERT(stat < IP6_NSTATS); 1926 IP6_STATINC(stat); 1927 } 1928
Indexes created Mon Sep 22 05:09:51 GMT 2025