ip6_input.c revision 1.192
1 /* $NetBSD: ip6_input.c,v 1.192 2018/02/14 05:29:39 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 1.192 2018/02/14 05:29:39 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, frg_present; 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 frg_present = 0; 745 while (nxt != IPPROTO_DONE) { 746 if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) { 747 IP6_STATINC(IP6_STAT_TOOMANYHDR); 748 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 749 goto bad; 750 } 751 752 /* 753 * protection against faulty packet - there should be 754 * more sanity checks in header chain processing. 755 */ 756 if (m->m_pkthdr.len < off) { 757 IP6_STATINC(IP6_STAT_TOOSHORT); 758 in6_ifstat_inc(rcvif, ifs6_in_truncated); 759 goto bad; 760 } 761 762 if (nxt == IPPROTO_ROUTING) { 763 if (rh_present++) { 764 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 765 IP6_STATINC(IP6_STAT_BADOPTIONS); 766 goto bad; 767 } 768 } else if (nxt == IPPROTO_FRAGMENT) { 769 if (frg_present++) { 770 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 771 IP6_STATINC(IP6_STAT_BADOPTIONS); 772 goto bad; 773 } 774 } 775 776 #ifdef IPSEC 777 if (ipsec_used) { 778 /* 779 * Enforce IPsec policy checking if we are seeing last 780 * header. Note that we do not visit this with 781 * protocols with pcb layer code - like udp/tcp/raw ip. 782 */ 783 if ((inet6sw[ip_protox[nxt]].pr_flags 784 & PR_LASTHDR) != 0) { 785 int error; 786 787 error = ipsec6_input(m); 788 if (error) 789 goto bad; 790 } 791 } 792 #endif 793 794 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt); 795 } 796 return; 797 798 bad_unref: 799 rtcache_unref(rt, ro); 800 percpu_putref(ip6_forward_rt_percpu); 801 bad: 802 m_freem(m); 803 return; 804 } 805 806 /* 807 * set/grab in6_ifaddr correspond to IPv6 destination address. 808 */ 809 static struct m_tag * 810 ip6_setdstifaddr(struct mbuf *m, const struct in6_ifaddr *ia) 811 { 812 struct m_tag *mtag; 813 struct ip6aux *ip6a; 814 815 mtag = ip6_addaux(m); 816 if (mtag == NULL) 817 return NULL; 818 819 ip6a = (struct ip6aux *)(mtag + 1); 820 if (in6_setscope(&ip6a->ip6a_src, ia->ia_ifp, &ip6a->ip6a_scope_id)) { 821 IP6_STATINC(IP6_STAT_BADSCOPE); 822 return NULL; 823 } 824 825 ip6a->ip6a_src = ia->ia_addr.sin6_addr; 826 ip6a->ip6a_flags = ia->ia6_flags; 827 return mtag; 828 } 829 830 const struct ip6aux * 831 ip6_getdstifaddr(struct mbuf *m) 832 { 833 struct m_tag *mtag; 834 835 mtag = ip6_findaux(m); 836 if (mtag != NULL) 837 return (struct ip6aux *)(mtag + 1); 838 else 839 return NULL; 840 } 841 842 /* 843 * Hop-by-Hop options header processing. If a valid jumbo payload option is 844 * included, the real payload length will be stored in plenp. 845 * 846 * rtalertp - XXX: should be stored more smart way 847 */ 848 int 849 ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp, 850 struct mbuf **mp, int *offp) 851 { 852 struct mbuf *m = *mp; 853 int off = *offp, hbhlen; 854 struct ip6_hbh *hbh; 855 856 /* validation of the length of the header */ 857 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, 858 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh)); 859 if (hbh == NULL) { 860 IP6_STATINC(IP6_STAT_TOOSHORT); 861 return -1; 862 } 863 hbhlen = (hbh->ip6h_len + 1) << 3; 864 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 865 hbhlen); 866 if (hbh == NULL) { 867 IP6_STATINC(IP6_STAT_TOOSHORT); 868 return -1; 869 } 870 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 871 off += hbhlen; 872 hbhlen -= sizeof(struct ip6_hbh); 873 874 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 875 hbhlen, rtalertp, plenp) < 0) 876 return -1; 877 878 *offp = off; 879 *mp = m; 880 return 0; 881 } 882 883 /* 884 * Search header for all Hop-by-hop options and process each option. 885 * This function is separate from ip6_hopopts_input() in order to 886 * handle a case where the sending node itself process its hop-by-hop 887 * options header. In such a case, the function is called from ip6_output(). 888 * 889 * The function assumes that hbh header is located right after the IPv6 header 890 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to 891 * opthead + hbhlen is located in continuous memory region. 892 */ 893 static int 894 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen, 895 u_int32_t *rtalertp, u_int32_t *plenp) 896 { 897 struct ip6_hdr *ip6; 898 int optlen = 0; 899 u_int8_t *opt = opthead; 900 u_int16_t rtalert_val; 901 u_int32_t jumboplen; 902 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh); 903 904 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 905 switch (*opt) { 906 case IP6OPT_PAD1: 907 optlen = 1; 908 break; 909 case IP6OPT_PADN: 910 if (hbhlen < IP6OPT_MINLEN) { 911 IP6_STATINC(IP6_STAT_TOOSMALL); 912 goto bad; 913 } 914 optlen = *(opt + 1) + 2; 915 break; 916 case IP6OPT_RTALERT: 917 /* XXX may need check for alignment */ 918 if (hbhlen < IP6OPT_RTALERT_LEN) { 919 IP6_STATINC(IP6_STAT_TOOSMALL); 920 goto bad; 921 } 922 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) { 923 /* XXX stat */ 924 icmp6_error(m, ICMP6_PARAM_PROB, 925 ICMP6_PARAMPROB_HEADER, 926 erroff + opt + 1 - opthead); 927 return (-1); 928 } 929 optlen = IP6OPT_RTALERT_LEN; 930 memcpy((void *)&rtalert_val, (void *)(opt + 2), 2); 931 *rtalertp = ntohs(rtalert_val); 932 break; 933 case IP6OPT_JUMBO: 934 /* XXX may need check for alignment */ 935 if (hbhlen < IP6OPT_JUMBO_LEN) { 936 IP6_STATINC(IP6_STAT_TOOSMALL); 937 goto bad; 938 } 939 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) { 940 /* XXX stat */ 941 icmp6_error(m, ICMP6_PARAM_PROB, 942 ICMP6_PARAMPROB_HEADER, 943 erroff + opt + 1 - opthead); 944 return (-1); 945 } 946 optlen = IP6OPT_JUMBO_LEN; 947 948 /* 949 * IPv6 packets that have non 0 payload length 950 * must not contain a jumbo payload option. 951 */ 952 ip6 = mtod(m, struct ip6_hdr *); 953 if (ip6->ip6_plen) { 954 IP6_STATINC(IP6_STAT_BADOPTIONS); 955 icmp6_error(m, ICMP6_PARAM_PROB, 956 ICMP6_PARAMPROB_HEADER, 957 erroff + opt - opthead); 958 return (-1); 959 } 960 961 /* 962 * We may see jumbolen in unaligned location, so 963 * we'd need to perform memcpy(). 964 */ 965 memcpy(&jumboplen, opt + 2, sizeof(jumboplen)); 966 jumboplen = (u_int32_t)htonl(jumboplen); 967 968 #if 1 969 /* 970 * if there are multiple jumbo payload options, 971 * *plenp will be non-zero and the packet will be 972 * rejected. 973 * the behavior may need some debate in ipngwg - 974 * multiple options does not make sense, however, 975 * there's no explicit mention in specification. 976 */ 977 if (*plenp != 0) { 978 IP6_STATINC(IP6_STAT_BADOPTIONS); 979 icmp6_error(m, ICMP6_PARAM_PROB, 980 ICMP6_PARAMPROB_HEADER, 981 erroff + opt + 2 - opthead); 982 return (-1); 983 } 984 #endif 985 986 /* 987 * jumbo payload length must be larger than 65535. 988 */ 989 if (jumboplen <= IPV6_MAXPACKET) { 990 IP6_STATINC(IP6_STAT_BADOPTIONS); 991 icmp6_error(m, ICMP6_PARAM_PROB, 992 ICMP6_PARAMPROB_HEADER, 993 erroff + opt + 2 - opthead); 994 return (-1); 995 } 996 *plenp = jumboplen; 997 998 break; 999 default: /* unknown option */ 1000 if (hbhlen < IP6OPT_MINLEN) { 1001 IP6_STATINC(IP6_STAT_TOOSMALL); 1002 goto bad; 1003 } 1004 optlen = ip6_unknown_opt(opt, m, 1005 erroff + opt - opthead); 1006 if (optlen == -1) 1007 return (-1); 1008 optlen += 2; 1009 break; 1010 } 1011 } 1012 1013 return (0); 1014 1015 bad: 1016 m_freem(m); 1017 return (-1); 1018 } 1019 1020 /* 1021 * Unknown option processing. 1022 * The third argument `off' is the offset from the IPv6 header to the option, 1023 * which is necessary if the IPv6 header the and option header and IPv6 header 1024 * is not continuous in order to return an ICMPv6 error. 1025 */ 1026 int 1027 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off) 1028 { 1029 struct ip6_hdr *ip6; 1030 1031 switch (IP6OPT_TYPE(*optp)) { 1032 case IP6OPT_TYPE_SKIP: /* ignore the option */ 1033 return ((int)*(optp + 1)); 1034 case IP6OPT_TYPE_DISCARD: /* silently discard */ 1035 m_freem(m); 1036 return (-1); 1037 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 1038 IP6_STATINC(IP6_STAT_BADOPTIONS); 1039 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 1040 return (-1); 1041 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 1042 IP6_STATINC(IP6_STAT_BADOPTIONS); 1043 ip6 = mtod(m, struct ip6_hdr *); 1044 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 1045 (m->m_flags & (M_BCAST|M_MCAST))) 1046 m_freem(m); 1047 else 1048 icmp6_error(m, ICMP6_PARAM_PROB, 1049 ICMP6_PARAMPROB_OPTION, off); 1050 return (-1); 1051 } 1052 1053 m_freem(m); /* XXX: NOTREACHED */ 1054 return (-1); 1055 } 1056 1057 /* 1058 * Create the "control" list for this pcb. 1059 * 1060 * The routine will be called from upper layer handlers like tcp6_input(). 1061 * Thus the routine assumes that the caller (tcp6_input) have already 1062 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the 1063 * very first mbuf on the mbuf chain. 1064 * We may want to add some infinite loop prevention or sanity checks for safety. 1065 * (This applies only when you are using KAME mbuf chain restriction, i.e. 1066 * you are using IP6_EXTHDR_CHECK() not m_pulldown()) 1067 */ 1068 void 1069 ip6_savecontrol(struct in6pcb *in6p, struct mbuf **mp, 1070 struct ip6_hdr *ip6, struct mbuf *m) 1071 { 1072 struct socket *so = in6p->in6p_socket; 1073 #ifdef RFC2292 1074 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y)) 1075 #else 1076 #define IS2292(x, y) (y) 1077 #endif 1078 1079 if (SOOPT_TIMESTAMP(so->so_options)) 1080 mp = sbsavetimestamp(so->so_options, m, mp); 1081 1082 /* some OSes call this logic with IPv4 packet, for SO_TIMESTAMP */ 1083 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) 1084 return; 1085 1086 /* RFC 2292 sec. 5 */ 1087 if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) { 1088 struct in6_pktinfo pi6; 1089 1090 memcpy(&pi6.ipi6_addr, &ip6->ip6_dst, sizeof(struct in6_addr)); 1091 in6_clearscope(&pi6.ipi6_addr); /* XXX */ 1092 pi6.ipi6_ifindex = m->m_pkthdr.rcvif_index; 1093 *mp = sbcreatecontrol(&pi6, sizeof(pi6), 1094 IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6); 1095 if (*mp) 1096 mp = &(*mp)->m_next; 1097 } 1098 1099 if (in6p->in6p_flags & IN6P_HOPLIMIT) { 1100 int hlim = ip6->ip6_hlim & 0xff; 1101 1102 *mp = sbcreatecontrol(&hlim, sizeof(hlim), 1103 IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6); 1104 if (*mp) 1105 mp = &(*mp)->m_next; 1106 } 1107 1108 if ((in6p->in6p_flags & IN6P_TCLASS) != 0) { 1109 u_int32_t flowinfo; 1110 int tclass; 1111 1112 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK); 1113 flowinfo >>= 20; 1114 1115 tclass = flowinfo & 0xff; 1116 *mp = sbcreatecontrol(&tclass, sizeof(tclass), 1117 IPV6_TCLASS, IPPROTO_IPV6); 1118 1119 if (*mp) 1120 mp = &(*mp)->m_next; 1121 } 1122 1123 /* 1124 * IPV6_HOPOPTS socket option. Recall that we required super-user 1125 * privilege for the option (see ip6_ctloutput), but it might be too 1126 * strict, since there might be some hop-by-hop options which can be 1127 * returned to normal user. 1128 * See also RFC3542 section 8 (or RFC2292 section 6). 1129 */ 1130 if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0) { 1131 /* 1132 * Check if a hop-by-hop options header is contatined in the 1133 * received packet, and if so, store the options as ancillary 1134 * data. Note that a hop-by-hop options header must be 1135 * just after the IPv6 header, which fact is assured through 1136 * the IPv6 input processing. 1137 */ 1138 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1139 if (xip6->ip6_nxt == IPPROTO_HOPOPTS) { 1140 struct ip6_hbh *hbh; 1141 int hbhlen; 1142 struct mbuf *ext; 1143 1144 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr), 1145 xip6->ip6_nxt); 1146 if (ext == NULL) { 1147 IP6_STATINC(IP6_STAT_TOOSHORT); 1148 return; 1149 } 1150 hbh = mtod(ext, struct ip6_hbh *); 1151 hbhlen = (hbh->ip6h_len + 1) << 3; 1152 if (hbhlen != ext->m_len) { 1153 m_freem(ext); 1154 IP6_STATINC(IP6_STAT_TOOSHORT); 1155 return; 1156 } 1157 1158 /* 1159 * XXX: We copy whole the header even if a jumbo 1160 * payload option is included, which option is to 1161 * be removed before returning in the RFC 2292. 1162 * Note: this constraint is removed in RFC3542. 1163 */ 1164 *mp = sbcreatecontrol(hbh, hbhlen, 1165 IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS), 1166 IPPROTO_IPV6); 1167 if (*mp) 1168 mp = &(*mp)->m_next; 1169 m_freem(ext); 1170 } 1171 } 1172 1173 /* IPV6_DSTOPTS and IPV6_RTHDR socket options */ 1174 if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) { 1175 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1176 int nxt = xip6->ip6_nxt, off = sizeof(struct ip6_hdr); 1177 1178 /* 1179 * Search for destination options headers or routing 1180 * header(s) through the header chain, and stores each 1181 * header as ancillary data. 1182 * Note that the order of the headers remains in 1183 * the chain of ancillary data. 1184 */ 1185 for (;;) { /* is explicit loop prevention necessary? */ 1186 struct ip6_ext *ip6e = NULL; 1187 int elen; 1188 struct mbuf *ext = NULL; 1189 1190 /* 1191 * if it is not an extension header, don't try to 1192 * pull it from the chain. 1193 */ 1194 switch (nxt) { 1195 case IPPROTO_DSTOPTS: 1196 case IPPROTO_ROUTING: 1197 case IPPROTO_HOPOPTS: 1198 case IPPROTO_AH: /* is it possible? */ 1199 break; 1200 default: 1201 goto loopend; 1202 } 1203 1204 ext = ip6_pullexthdr(m, off, nxt); 1205 if (ext == NULL) { 1206 IP6_STATINC(IP6_STAT_TOOSHORT); 1207 return; 1208 } 1209 ip6e = mtod(ext, struct ip6_ext *); 1210 if (nxt == IPPROTO_AH) 1211 elen = (ip6e->ip6e_len + 2) << 2; 1212 else 1213 elen = (ip6e->ip6e_len + 1) << 3; 1214 if (elen != ext->m_len) { 1215 m_freem(ext); 1216 IP6_STATINC(IP6_STAT_TOOSHORT); 1217 return; 1218 } 1219 KASSERT(IP6_HDR_ALIGNED_P(ip6e)); 1220 1221 switch (nxt) { 1222 case IPPROTO_DSTOPTS: 1223 if (!(in6p->in6p_flags & IN6P_DSTOPTS)) 1224 break; 1225 1226 *mp = sbcreatecontrol(ip6e, elen, 1227 IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS), 1228 IPPROTO_IPV6); 1229 if (*mp) 1230 mp = &(*mp)->m_next; 1231 break; 1232 1233 case IPPROTO_ROUTING: 1234 if (!(in6p->in6p_flags & IN6P_RTHDR)) 1235 break; 1236 1237 *mp = sbcreatecontrol(ip6e, elen, 1238 IS2292(IPV6_2292RTHDR, IPV6_RTHDR), 1239 IPPROTO_IPV6); 1240 if (*mp) 1241 mp = &(*mp)->m_next; 1242 break; 1243 1244 case IPPROTO_HOPOPTS: 1245 case IPPROTO_AH: /* is it possible? */ 1246 break; 1247 1248 default: 1249 /* 1250 * other cases have been filtered in the above. 1251 * none will visit this case. here we supply 1252 * the code just in case (nxt overwritten or 1253 * other cases). 1254 */ 1255 m_freem(ext); 1256 goto loopend; 1257 1258 } 1259 1260 /* proceed with the next header. */ 1261 off += elen; 1262 nxt = ip6e->ip6e_nxt; 1263 ip6e = NULL; 1264 m_freem(ext); 1265 ext = NULL; 1266 } 1267 loopend: 1268 ; 1269 } 1270 } 1271 #undef IS2292 1272 1273 1274 void 1275 ip6_notify_pmtu(struct in6pcb *in6p, const struct sockaddr_in6 *dst, 1276 uint32_t *mtu) 1277 { 1278 struct socket *so; 1279 struct mbuf *m_mtu; 1280 struct ip6_mtuinfo mtuctl; 1281 1282 so = in6p->in6p_socket; 1283 1284 if (mtu == NULL) 1285 return; 1286 1287 KASSERT(so != NULL); 1288 1289 memset(&mtuctl, 0, sizeof(mtuctl)); /* zero-clear for safety */ 1290 mtuctl.ip6m_mtu = *mtu; 1291 mtuctl.ip6m_addr = *dst; 1292 if (sa6_recoverscope(&mtuctl.ip6m_addr)) 1293 return; 1294 1295 if ((m_mtu = sbcreatecontrol(&mtuctl, sizeof(mtuctl), 1296 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL) 1297 return; 1298 1299 if (sbappendaddr(&so->so_rcv, (const struct sockaddr *)dst, NULL, m_mtu) 1300 == 0) { 1301 m_freem(m_mtu); 1302 /* XXX: should count statistics */ 1303 } else 1304 sorwakeup(so); 1305 1306 return; 1307 } 1308 1309 /* 1310 * pull single extension header from mbuf chain. returns single mbuf that 1311 * contains the result, or NULL on error. 1312 */ 1313 static struct mbuf * 1314 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt) 1315 { 1316 struct ip6_ext ip6e; 1317 size_t elen; 1318 struct mbuf *n; 1319 1320 #ifdef DIAGNOSTIC 1321 switch (nxt) { 1322 case IPPROTO_DSTOPTS: 1323 case IPPROTO_ROUTING: 1324 case IPPROTO_HOPOPTS: 1325 case IPPROTO_AH: /* is it possible? */ 1326 break; 1327 default: 1328 printf("ip6_pullexthdr: invalid nxt=%d\n", nxt); 1329 } 1330 #endif 1331 1332 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1333 if (nxt == IPPROTO_AH) 1334 elen = (ip6e.ip6e_len + 2) << 2; 1335 else 1336 elen = (ip6e.ip6e_len + 1) << 3; 1337 1338 MGET(n, M_DONTWAIT, MT_DATA); 1339 if (n && elen >= MLEN) { 1340 MCLGET(n, M_DONTWAIT); 1341 if ((n->m_flags & M_EXT) == 0) { 1342 m_free(n); 1343 n = NULL; 1344 } 1345 } 1346 if (!n) 1347 return NULL; 1348 1349 n->m_len = 0; 1350 if (elen >= M_TRAILINGSPACE(n)) { 1351 m_free(n); 1352 return NULL; 1353 } 1354 1355 m_copydata(m, off, elen, mtod(n, void *)); 1356 n->m_len = elen; 1357 return n; 1358 } 1359 1360 /* 1361 * Get offset to the previous header followed by the header 1362 * currently processed. 1363 */ 1364 int 1365 ip6_get_prevhdr(struct mbuf *m, int off) 1366 { 1367 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1368 1369 if (off == sizeof(struct ip6_hdr)) { 1370 return offsetof(struct ip6_hdr, ip6_nxt); 1371 } else if (off < sizeof(struct ip6_hdr)) { 1372 panic("%s: off < sizeof(struct ip6_hdr)", __func__); 1373 } else { 1374 int len, nlen, nxt; 1375 struct ip6_ext ip6e; 1376 1377 nxt = ip6->ip6_nxt; 1378 len = sizeof(struct ip6_hdr); 1379 nlen = 0; 1380 while (len < off) { 1381 m_copydata(m, len, sizeof(ip6e), &ip6e); 1382 1383 switch (nxt) { 1384 case IPPROTO_FRAGMENT: 1385 nlen = sizeof(struct ip6_frag); 1386 break; 1387 case IPPROTO_AH: 1388 nlen = (ip6e.ip6e_len + 2) << 2; 1389 break; 1390 default: 1391 nlen = (ip6e.ip6e_len + 1) << 3; 1392 break; 1393 } 1394 len += nlen; 1395 nxt = ip6e.ip6e_nxt; 1396 } 1397 1398 return (len - nlen); 1399 } 1400 } 1401 1402 /* 1403 * get next header offset. m will be retained. 1404 */ 1405 int 1406 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp) 1407 { 1408 struct ip6_hdr ip6; 1409 struct ip6_ext ip6e; 1410 struct ip6_frag fh; 1411 1412 /* just in case */ 1413 if (m == NULL) 1414 panic("%s: m == NULL", __func__); 1415 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off) 1416 return -1; 1417 1418 switch (proto) { 1419 case IPPROTO_IPV6: 1420 /* do not chase beyond intermediate IPv6 headers */ 1421 if (off != 0) 1422 return -1; 1423 if (m->m_pkthdr.len < off + sizeof(ip6)) 1424 return -1; 1425 m_copydata(m, off, sizeof(ip6), (void *)&ip6); 1426 if (nxtp) 1427 *nxtp = ip6.ip6_nxt; 1428 off += sizeof(ip6); 1429 return off; 1430 1431 case IPPROTO_FRAGMENT: 1432 /* 1433 * terminate parsing if it is not the first fragment, 1434 * it does not make sense to parse through it. 1435 */ 1436 if (m->m_pkthdr.len < off + sizeof(fh)) 1437 return -1; 1438 m_copydata(m, off, sizeof(fh), (void *)&fh); 1439 if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0) 1440 return -1; 1441 if (nxtp) 1442 *nxtp = fh.ip6f_nxt; 1443 off += sizeof(struct ip6_frag); 1444 return off; 1445 1446 case IPPROTO_AH: 1447 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1448 return -1; 1449 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1450 if (nxtp) 1451 *nxtp = ip6e.ip6e_nxt; 1452 off += (ip6e.ip6e_len + 2) << 2; 1453 if (m->m_pkthdr.len < off) 1454 return -1; 1455 return off; 1456 1457 case IPPROTO_HOPOPTS: 1458 case IPPROTO_ROUTING: 1459 case IPPROTO_DSTOPTS: 1460 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1461 return -1; 1462 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1463 if (nxtp) 1464 *nxtp = ip6e.ip6e_nxt; 1465 off += (ip6e.ip6e_len + 1) << 3; 1466 if (m->m_pkthdr.len < off) 1467 return -1; 1468 return off; 1469 1470 case IPPROTO_NONE: 1471 case IPPROTO_ESP: 1472 case IPPROTO_IPCOMP: 1473 /* give up */ 1474 return -1; 1475 1476 default: 1477 return -1; 1478 } 1479 } 1480 1481 /* 1482 * get offset for the last header in the chain. m will be kept untainted. 1483 */ 1484 int 1485 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp) 1486 { 1487 int newoff; 1488 int nxt; 1489 1490 if (!nxtp) { 1491 nxt = -1; 1492 nxtp = &nxt; 1493 } 1494 for (;;) { 1495 newoff = ip6_nexthdr(m, off, proto, nxtp); 1496 if (newoff < 0) 1497 return off; 1498 else if (newoff < off) 1499 return -1; /* invalid */ 1500 else if (newoff == off) 1501 return newoff; 1502 1503 off = newoff; 1504 proto = *nxtp; 1505 } 1506 } 1507 1508 struct m_tag * 1509 ip6_addaux(struct mbuf *m) 1510 { 1511 struct m_tag *mtag; 1512 1513 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1514 if (!mtag) { 1515 mtag = m_tag_get(PACKET_TAG_INET6, sizeof(struct ip6aux), 1516 M_NOWAIT); 1517 if (mtag) { 1518 m_tag_prepend(m, mtag); 1519 memset(mtag + 1, 0, sizeof(struct ip6aux)); 1520 } 1521 } 1522 return mtag; 1523 } 1524 1525 struct m_tag * 1526 ip6_findaux(struct mbuf *m) 1527 { 1528 struct m_tag *mtag; 1529 1530 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1531 return mtag; 1532 } 1533 1534 void 1535 ip6_delaux(struct mbuf *m) 1536 { 1537 struct m_tag *mtag; 1538 1539 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1540 if (mtag) 1541 m_tag_delete(m, mtag); 1542 } 1543 1544 /* 1545 * System control for IP6 1546 */ 1547 1548 const u_char inet6ctlerrmap[PRC_NCMDS] = { 1549 0, 0, 0, 0, 1550 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 1551 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 1552 EMSGSIZE, EHOSTUNREACH, 0, 0, 1553 0, 0, 0, 0, 1554 ENOPROTOOPT 1555 }; 1556 1557 extern int sysctl_net_inet6_addrctlpolicy(SYSCTLFN_ARGS); 1558 1559 static int 1560 sysctl_net_inet6_ip6_stats(SYSCTLFN_ARGS) 1561 { 1562 1563 return (NETSTAT_SYSCTL(ip6stat_percpu, IP6_NSTATS)); 1564 } 1565 1566 static void 1567 sysctl_net_inet6_ip6_setup(struct sysctllog **clog) 1568 { 1569 1570 sysctl_createv(clog, 0, NULL, NULL, 1571 CTLFLAG_PERMANENT, 1572 CTLTYPE_NODE, "inet6", 1573 SYSCTL_DESCR("PF_INET6 related settings"), 1574 NULL, 0, NULL, 0, 1575 CTL_NET, PF_INET6, CTL_EOL); 1576 sysctl_createv(clog, 0, NULL, NULL, 1577 CTLFLAG_PERMANENT, 1578 CTLTYPE_NODE, "ip6", 1579 SYSCTL_DESCR("IPv6 related settings"), 1580 NULL, 0, NULL, 0, 1581 CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_EOL); 1582 1583 sysctl_createv(clog, 0, NULL, NULL, 1584 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1585 CTLTYPE_INT, "forwarding", 1586 SYSCTL_DESCR("Enable forwarding of INET6 datagrams"), 1587 NULL, 0, &ip6_forwarding, 0, 1588 CTL_NET, PF_INET6, IPPROTO_IPV6, 1589 IPV6CTL_FORWARDING, CTL_EOL); 1590 sysctl_createv(clog, 0, NULL, NULL, 1591 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1592 CTLTYPE_INT, "redirect", 1593 SYSCTL_DESCR("Enable sending of ICMPv6 redirect messages"), 1594 NULL, 0, &ip6_sendredirects, 0, 1595 CTL_NET, PF_INET6, IPPROTO_IPV6, 1596 IPV6CTL_SENDREDIRECTS, CTL_EOL); 1597 sysctl_createv(clog, 0, NULL, NULL, 1598 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1599 CTLTYPE_INT, "hlim", 1600 SYSCTL_DESCR("Hop limit for an INET6 datagram"), 1601 NULL, 0, &ip6_defhlim, 0, 1602 CTL_NET, PF_INET6, IPPROTO_IPV6, 1603 IPV6CTL_DEFHLIM, CTL_EOL); 1604 sysctl_createv(clog, 0, NULL, NULL, 1605 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1606 CTLTYPE_INT, "maxfragpackets", 1607 SYSCTL_DESCR("Maximum number of fragments to buffer " 1608 "for reassembly"), 1609 NULL, 0, &ip6_maxfragpackets, 0, 1610 CTL_NET, PF_INET6, IPPROTO_IPV6, 1611 IPV6CTL_MAXFRAGPACKETS, CTL_EOL); 1612 sysctl_createv(clog, 0, NULL, NULL, 1613 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1614 CTLTYPE_INT, "accept_rtadv", 1615 SYSCTL_DESCR("Accept router advertisements"), 1616 NULL, 0, &ip6_accept_rtadv, 0, 1617 CTL_NET, PF_INET6, IPPROTO_IPV6, 1618 IPV6CTL_ACCEPT_RTADV, CTL_EOL); 1619 sysctl_createv(clog, 0, NULL, NULL, 1620 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1621 CTLTYPE_INT, "rtadv_maxroutes", 1622 SYSCTL_DESCR("Maximum number of routes accepted via router advertisements"), 1623 NULL, 0, &ip6_rtadv_maxroutes, 0, 1624 CTL_NET, PF_INET6, IPPROTO_IPV6, 1625 IPV6CTL_RTADV_MAXROUTES, CTL_EOL); 1626 sysctl_createv(clog, 0, NULL, NULL, 1627 CTLFLAG_PERMANENT, 1628 CTLTYPE_INT, "rtadv_numroutes", 1629 SYSCTL_DESCR("Current number of routes accepted via router advertisements"), 1630 NULL, 0, &nd6_numroutes, 0, 1631 CTL_NET, PF_INET6, IPPROTO_IPV6, 1632 IPV6CTL_RTADV_NUMROUTES, CTL_EOL); 1633 sysctl_createv(clog, 0, NULL, NULL, 1634 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1635 CTLTYPE_INT, "keepfaith", 1636 SYSCTL_DESCR("Activate faith interface"), 1637 NULL, 0, &ip6_keepfaith, 0, 1638 CTL_NET, PF_INET6, IPPROTO_IPV6, 1639 IPV6CTL_KEEPFAITH, CTL_EOL); 1640 sysctl_createv(clog, 0, NULL, NULL, 1641 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1642 CTLTYPE_INT, "log_interval", 1643 SYSCTL_DESCR("Minimum interval between logging " 1644 "unroutable packets"), 1645 NULL, 0, &ip6_log_interval, 0, 1646 CTL_NET, PF_INET6, IPPROTO_IPV6, 1647 IPV6CTL_LOG_INTERVAL, CTL_EOL); 1648 sysctl_createv(clog, 0, NULL, NULL, 1649 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1650 CTLTYPE_INT, "hdrnestlimit", 1651 SYSCTL_DESCR("Maximum number of nested IPv6 headers"), 1652 NULL, 0, &ip6_hdrnestlimit, 0, 1653 CTL_NET, PF_INET6, IPPROTO_IPV6, 1654 IPV6CTL_HDRNESTLIMIT, CTL_EOL); 1655 sysctl_createv(clog, 0, NULL, NULL, 1656 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1657 CTLTYPE_INT, "dad_count", 1658 SYSCTL_DESCR("Number of Duplicate Address Detection " 1659 "probes to send"), 1660 NULL, 0, &ip6_dad_count, 0, 1661 CTL_NET, PF_INET6, IPPROTO_IPV6, 1662 IPV6CTL_DAD_COUNT, CTL_EOL); 1663 sysctl_createv(clog, 0, NULL, NULL, 1664 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1665 CTLTYPE_INT, "auto_flowlabel", 1666 SYSCTL_DESCR("Assign random IPv6 flow labels"), 1667 NULL, 0, &ip6_auto_flowlabel, 0, 1668 CTL_NET, PF_INET6, IPPROTO_IPV6, 1669 IPV6CTL_AUTO_FLOWLABEL, CTL_EOL); 1670 sysctl_createv(clog, 0, NULL, NULL, 1671 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1672 CTLTYPE_INT, "defmcasthlim", 1673 SYSCTL_DESCR("Default multicast hop limit"), 1674 NULL, 0, &ip6_defmcasthlim, 0, 1675 CTL_NET, PF_INET6, IPPROTO_IPV6, 1676 IPV6CTL_DEFMCASTHLIM, CTL_EOL); 1677 sysctl_createv(clog, 0, NULL, NULL, 1678 CTLFLAG_PERMANENT, 1679 CTLTYPE_STRING, "kame_version", 1680 SYSCTL_DESCR("KAME Version"), 1681 NULL, 0, __UNCONST(__KAME_VERSION), 0, 1682 CTL_NET, PF_INET6, IPPROTO_IPV6, 1683 IPV6CTL_KAME_VERSION, CTL_EOL); 1684 sysctl_createv(clog, 0, NULL, NULL, 1685 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1686 CTLTYPE_INT, "use_deprecated", 1687 SYSCTL_DESCR("Allow use of deprecated addresses as " 1688 "source addresses"), 1689 NULL, 0, &ip6_use_deprecated, 0, 1690 CTL_NET, PF_INET6, IPPROTO_IPV6, 1691 IPV6CTL_USE_DEPRECATED, CTL_EOL); 1692 sysctl_createv(clog, 0, NULL, NULL, 1693 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1694 CTLTYPE_INT, "rr_prune", NULL, 1695 NULL, 0, &ip6_rr_prune, 0, 1696 CTL_NET, PF_INET6, IPPROTO_IPV6, 1697 IPV6CTL_RR_PRUNE, CTL_EOL); 1698 sysctl_createv(clog, 0, NULL, NULL, 1699 CTLFLAG_PERMANENT 1700 #ifndef INET6_BINDV6ONLY 1701 |CTLFLAG_READWRITE, 1702 #endif 1703 CTLTYPE_INT, "v6only", 1704 SYSCTL_DESCR("Disallow PF_INET6 sockets from connecting " 1705 "to PF_INET sockets"), 1706 NULL, 0, &ip6_v6only, 0, 1707 CTL_NET, PF_INET6, IPPROTO_IPV6, 1708 IPV6CTL_V6ONLY, CTL_EOL); 1709 sysctl_createv(clog, 0, NULL, NULL, 1710 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1711 CTLTYPE_INT, "anonportmin", 1712 SYSCTL_DESCR("Lowest ephemeral port number to assign"), 1713 sysctl_net_inet_ip_ports, 0, &ip6_anonportmin, 0, 1714 CTL_NET, PF_INET6, IPPROTO_IPV6, 1715 IPV6CTL_ANONPORTMIN, CTL_EOL); 1716 sysctl_createv(clog, 0, NULL, NULL, 1717 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1718 CTLTYPE_INT, "anonportmax", 1719 SYSCTL_DESCR("Highest ephemeral port number to assign"), 1720 sysctl_net_inet_ip_ports, 0, &ip6_anonportmax, 0, 1721 CTL_NET, PF_INET6, IPPROTO_IPV6, 1722 IPV6CTL_ANONPORTMAX, CTL_EOL); 1723 #ifndef IPNOPRIVPORTS 1724 sysctl_createv(clog, 0, NULL, NULL, 1725 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1726 CTLTYPE_INT, "lowportmin", 1727 SYSCTL_DESCR("Lowest privileged ephemeral port number " 1728 "to assign"), 1729 sysctl_net_inet_ip_ports, 0, &ip6_lowportmin, 0, 1730 CTL_NET, PF_INET6, IPPROTO_IPV6, 1731 IPV6CTL_LOWPORTMIN, CTL_EOL); 1732 sysctl_createv(clog, 0, NULL, NULL, 1733 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1734 CTLTYPE_INT, "lowportmax", 1735 SYSCTL_DESCR("Highest privileged ephemeral port number " 1736 "to assign"), 1737 sysctl_net_inet_ip_ports, 0, &ip6_lowportmax, 0, 1738 CTL_NET, PF_INET6, IPPROTO_IPV6, 1739 IPV6CTL_LOWPORTMAX, CTL_EOL); 1740 #endif /* IPNOPRIVPORTS */ 1741 sysctl_createv(clog, 0, NULL, NULL, 1742 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1743 CTLTYPE_INT, "auto_linklocal", 1744 SYSCTL_DESCR("Default value of per-interface flag for " 1745 "adding an IPv6 link-local address to " 1746 "interfaces when attached"), 1747 NULL, 0, &ip6_auto_linklocal, 0, 1748 CTL_NET, PF_INET6, IPPROTO_IPV6, 1749 IPV6CTL_AUTO_LINKLOCAL, CTL_EOL); 1750 sysctl_createv(clog, 0, NULL, NULL, 1751 CTLFLAG_PERMANENT|CTLFLAG_READONLY, 1752 CTLTYPE_STRUCT, "addctlpolicy", 1753 SYSCTL_DESCR("Return the current address control" 1754 " policy"), 1755 sysctl_net_inet6_addrctlpolicy, 0, NULL, 0, 1756 CTL_NET, PF_INET6, IPPROTO_IPV6, 1757 IPV6CTL_ADDRCTLPOLICY, CTL_EOL); 1758 sysctl_createv(clog, 0, NULL, NULL, 1759 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1760 CTLTYPE_INT, "use_tempaddr", 1761 SYSCTL_DESCR("Use temporary address"), 1762 NULL, 0, &ip6_use_tempaddr, 0, 1763 CTL_NET, PF_INET6, IPPROTO_IPV6, 1764 CTL_CREATE, CTL_EOL); 1765 sysctl_createv(clog, 0, NULL, NULL, 1766 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1767 CTLTYPE_INT, "prefer_tempaddr", 1768 SYSCTL_DESCR("Prefer temporary address as source " 1769 "address"), 1770 NULL, 0, &ip6_prefer_tempaddr, 0, 1771 CTL_NET, PF_INET6, IPPROTO_IPV6, 1772 CTL_CREATE, CTL_EOL); 1773 sysctl_createv(clog, 0, NULL, NULL, 1774 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1775 CTLTYPE_INT, "temppltime", 1776 SYSCTL_DESCR("preferred lifetime of a temporary address"), 1777 NULL, 0, &ip6_temp_preferred_lifetime, 0, 1778 CTL_NET, PF_INET6, IPPROTO_IPV6, 1779 CTL_CREATE, CTL_EOL); 1780 sysctl_createv(clog, 0, NULL, NULL, 1781 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1782 CTLTYPE_INT, "tempvltime", 1783 SYSCTL_DESCR("valid lifetime of a temporary address"), 1784 NULL, 0, &ip6_temp_valid_lifetime, 0, 1785 CTL_NET, PF_INET6, IPPROTO_IPV6, 1786 CTL_CREATE, CTL_EOL); 1787 sysctl_createv(clog, 0, NULL, NULL, 1788 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1789 CTLTYPE_INT, "maxfrags", 1790 SYSCTL_DESCR("Maximum fragments in reassembly queue"), 1791 NULL, 0, &ip6_maxfrags, 0, 1792 CTL_NET, PF_INET6, IPPROTO_IPV6, 1793 IPV6CTL_MAXFRAGS, CTL_EOL); 1794 sysctl_createv(clog, 0, NULL, NULL, 1795 CTLFLAG_PERMANENT, 1796 CTLTYPE_STRUCT, "stats", 1797 SYSCTL_DESCR("IPv6 statistics"), 1798 sysctl_net_inet6_ip6_stats, 0, NULL, 0, 1799 CTL_NET, PF_INET6, IPPROTO_IPV6, 1800 IPV6CTL_STATS, CTL_EOL); 1801 sysctl_createv(clog, 0, NULL, NULL, 1802 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1803 CTLTYPE_INT, "use_defaultzone", 1804 SYSCTL_DESCR("Whether to use the default scope zones"), 1805 NULL, 0, &ip6_use_defzone, 0, 1806 CTL_NET, PF_INET6, IPPROTO_IPV6, 1807 IPV6CTL_USE_DEFAULTZONE, CTL_EOL); 1808 sysctl_createv(clog, 0, NULL, NULL, 1809 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1810 CTLTYPE_INT, "mcast_pmtu", 1811 SYSCTL_DESCR("Enable pMTU discovery for multicast packet"), 1812 NULL, 0, &ip6_mcast_pmtu, 0, 1813 CTL_NET, PF_INET6, IPPROTO_IPV6, 1814 CTL_CREATE, CTL_EOL); 1815 /* anonportalgo RFC6056 subtree */ 1816 const struct sysctlnode *portalgo_node; 1817 sysctl_createv(clog, 0, NULL, &portalgo_node, 1818 CTLFLAG_PERMANENT, 1819 CTLTYPE_NODE, "anonportalgo", 1820 SYSCTL_DESCR("Anonymous port algorithm selection (RFC 6056)"), 1821 NULL, 0, NULL, 0, 1822 CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_CREATE, CTL_EOL); 1823 sysctl_createv(clog, 0, &portalgo_node, NULL, 1824 CTLFLAG_PERMANENT, 1825 CTLTYPE_STRING, "available", 1826 SYSCTL_DESCR("available algorithms"), 1827 sysctl_portalgo_available, 0, NULL, PORTALGO_MAXLEN, 1828 CTL_CREATE, CTL_EOL); 1829 sysctl_createv(clog, 0, &portalgo_node, NULL, 1830 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1831 CTLTYPE_STRING, "selected", 1832 SYSCTL_DESCR("selected algorithm"), 1833 sysctl_portalgo_selected6, 0, NULL, PORTALGO_MAXLEN, 1834 CTL_CREATE, CTL_EOL); 1835 sysctl_createv(clog, 0, &portalgo_node, NULL, 1836 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1837 CTLTYPE_STRUCT, "reserve", 1838 SYSCTL_DESCR("bitmap of reserved ports"), 1839 sysctl_portalgo_reserve6, 0, NULL, 0, 1840 CTL_CREATE, CTL_EOL); 1841 sysctl_createv(clog, 0, NULL, NULL, 1842 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1843 CTLTYPE_INT, "neighborgcthresh", 1844 SYSCTL_DESCR("Maximum number of entries in neighbor" 1845 " cache"), 1846 NULL, 1, &ip6_neighborgcthresh, 0, 1847 CTL_NET, PF_INET6, IPPROTO_IPV6, 1848 CTL_CREATE, CTL_EOL); 1849 sysctl_createv(clog, 0, NULL, NULL, 1850 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1851 CTLTYPE_INT, "maxifprefixes", 1852 SYSCTL_DESCR("Maximum number of prefixes created by" 1853 " route advertisement per interface"), 1854 NULL, 1, &ip6_maxifprefixes, 0, 1855 CTL_NET, PF_INET6, IPPROTO_IPV6, 1856 CTL_CREATE, CTL_EOL); 1857 sysctl_createv(clog, 0, NULL, NULL, 1858 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1859 CTLTYPE_INT, "maxifdefrouters", 1860 SYSCTL_DESCR("Maximum number of default routers created" 1861 " by route advertisement per interface"), 1862 NULL, 1, &ip6_maxifdefrouters, 0, 1863 CTL_NET, PF_INET6, IPPROTO_IPV6, 1864 CTL_CREATE, CTL_EOL); 1865 sysctl_createv(clog, 0, NULL, NULL, 1866 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1867 CTLTYPE_INT, "maxdynroutes", 1868 SYSCTL_DESCR("Maximum number of routes created via" 1869 " redirect"), 1870 NULL, 1, &ip6_maxdynroutes, 0, 1871 CTL_NET, PF_INET6, IPPROTO_IPV6, 1872 CTL_CREATE, CTL_EOL); 1873 } 1874 1875 void 1876 ip6_statinc(u_int stat) 1877 { 1878 1879 KASSERT(stat < IP6_NSTATS); 1880 IP6_STATINC(stat); 1881 } 1882
Indexes created Mon Sep 22 13:09:51 GMT 2025