ip6_input.c revision 1.202
1 /* $NetBSD: ip6_input.c,v 1.202 2018/05/14 17:34:26 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 1.202 2018/05/14 17:34:26 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 extern struct domain inet6domain; 127 128 u_char ip6_protox[IPPROTO_MAX]; 129 pktqueue_t *ip6_pktq __read_mostly; 130 131 pfil_head_t *inet6_pfil_hook; 132 133 percpu_t *ip6stat_percpu; 134 135 percpu_t *ip6_forward_rt_percpu __cacheline_aligned; 136 137 static void ip6_init2(void); 138 static void ip6intr(void *); 139 static bool ip6_badaddr(struct ip6_hdr *); 140 static struct m_tag *ip6_setdstifaddr(struct mbuf *, const struct in6_ifaddr *); 141 142 static int ip6_process_hopopts(struct mbuf *, u_int8_t *, int, u_int32_t *, 143 u_int32_t *); 144 static struct mbuf *ip6_pullexthdr(struct mbuf *, size_t, int); 145 static void sysctl_net_inet6_ip6_setup(struct sysctllog **); 146 147 #ifdef NET_MPSAFE 148 #define SOFTNET_LOCK() mutex_enter(softnet_lock) 149 #define SOFTNET_UNLOCK() mutex_exit(softnet_lock) 150 #else 151 #define SOFTNET_LOCK() KASSERT(mutex_owned(softnet_lock)) 152 #define SOFTNET_UNLOCK() KASSERT(mutex_owned(softnet_lock)) 153 #endif 154 155 /* 156 * IP6 initialization: fill in IP6 protocol switch table. 157 * All protocols not implemented in kernel go to raw IP6 protocol handler. 158 */ 159 void 160 ip6_init(void) 161 { 162 const struct ip6protosw *pr; 163 int i; 164 165 in6_init(); 166 167 sysctl_net_inet6_ip6_setup(NULL); 168 pr = (const struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 169 if (pr == 0) 170 panic("ip6_init"); 171 for (i = 0; i < IPPROTO_MAX; i++) 172 ip6_protox[i] = pr - inet6sw; 173 for (pr = (const struct ip6protosw *)inet6domain.dom_protosw; 174 pr < (const struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++) 175 if (pr->pr_domain->dom_family == PF_INET6 && 176 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) 177 ip6_protox[pr->pr_protocol] = pr - inet6sw; 178 179 ip6_pktq = pktq_create(IFQ_MAXLEN, ip6intr, NULL); 180 KASSERT(ip6_pktq != NULL); 181 182 scope6_init(); 183 addrsel_policy_init(); 184 nd6_init(); 185 frag6_init(); 186 ip6_desync_factor = cprng_fast32() % MAX_TEMP_DESYNC_FACTOR; 187 188 ip6_init2(); 189 #ifdef GATEWAY 190 ip6flow_init(ip6_hashsize); 191 #endif 192 /* Register our Packet Filter hook. */ 193 inet6_pfil_hook = pfil_head_create(PFIL_TYPE_AF, (void *)AF_INET6); 194 KASSERT(inet6_pfil_hook != NULL); 195 196 ip6stat_percpu = percpu_alloc(sizeof(uint64_t) * IP6_NSTATS); 197 ip6_forward_rt_percpu = percpu_alloc(sizeof(struct route)); 198 } 199 200 static void 201 ip6_init2(void) 202 { 203 204 /* timer for regeneration of temporary addresses randomize ID */ 205 callout_init(&in6_tmpaddrtimer_ch, CALLOUT_MPSAFE); 206 callout_reset(&in6_tmpaddrtimer_ch, 207 (ip6_temp_preferred_lifetime - ip6_desync_factor - 208 ip6_temp_regen_advance) * hz, 209 in6_tmpaddrtimer, NULL); 210 } 211 212 /* 213 * IP6 input interrupt handling. Just pass the packet to ip6_input. 214 */ 215 static void 216 ip6intr(void *arg __unused) 217 { 218 struct mbuf *m; 219 220 SOFTNET_KERNEL_LOCK_UNLESS_NET_MPSAFE(); 221 while ((m = pktq_dequeue(ip6_pktq)) != NULL) { 222 struct psref psref; 223 struct ifnet *rcvif = m_get_rcvif_psref(m, &psref); 224 225 if (rcvif == NULL) { 226 m_freem(m); 227 continue; 228 } 229 /* 230 * Drop the packet if IPv6 is disabled on the interface. 231 */ 232 if ((ND_IFINFO(rcvif)->flags & ND6_IFF_IFDISABLED)) { 233 m_put_rcvif_psref(rcvif, &psref); 234 m_freem(m); 235 continue; 236 } 237 ip6_input(m, rcvif); 238 m_put_rcvif_psref(rcvif, &psref); 239 } 240 SOFTNET_KERNEL_UNLOCK_UNLESS_NET_MPSAFE(); 241 } 242 243 void 244 ip6_input(struct mbuf *m, struct ifnet *rcvif) 245 { 246 struct ip6_hdr *ip6; 247 int hit, off = sizeof(struct ip6_hdr), nest; 248 u_int32_t plen; 249 u_int32_t rtalert = ~0; 250 int nxt, ours = 0, rh_present = 0, frg_present; 251 struct ifnet *deliverifp = NULL; 252 int srcrt = 0; 253 struct rtentry *rt = NULL; 254 union { 255 struct sockaddr dst; 256 struct sockaddr_in6 dst6; 257 } u; 258 struct route *ro; 259 260 KASSERT(rcvif != NULL); 261 262 /* 263 * make sure we don't have onion peering information into m_tag. 264 */ 265 ip6_delaux(m); 266 267 /* 268 * mbuf statistics 269 */ 270 if (m->m_flags & M_EXT) { 271 if (m->m_next) 272 IP6_STATINC(IP6_STAT_MEXT2M); 273 else 274 IP6_STATINC(IP6_STAT_MEXT1); 275 } else { 276 #define M2MMAX 32 277 if (m->m_next) { 278 if (m->m_flags & M_LOOP) 279 /*XXX*/ IP6_STATINC(IP6_STAT_M2M + lo0ifp->if_index); 280 else if (rcvif->if_index < M2MMAX) 281 IP6_STATINC(IP6_STAT_M2M + rcvif->if_index); 282 else 283 IP6_STATINC(IP6_STAT_M2M); 284 } else 285 IP6_STATINC(IP6_STAT_M1); 286 #undef M2MMAX 287 } 288 289 in6_ifstat_inc(rcvif, ifs6_in_receive); 290 IP6_STATINC(IP6_STAT_TOTAL); 291 292 /* 293 * If the IPv6 header is not aligned, slurp it up into a new 294 * mbuf with space for link headers, in the event we forward 295 * it. Otherwise, if it is aligned, make sure the entire base 296 * IPv6 header is in the first mbuf of the chain. 297 */ 298 if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 299 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 300 (max_linkhdr + 3) & ~3)) == NULL) { 301 /* XXXJRT new stat, please */ 302 IP6_STATINC(IP6_STAT_TOOSMALL); 303 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 304 return; 305 } 306 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 307 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 308 IP6_STATINC(IP6_STAT_TOOSMALL); 309 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 310 return; 311 } 312 } 313 314 ip6 = mtod(m, struct ip6_hdr *); 315 316 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 317 IP6_STATINC(IP6_STAT_BADVERS); 318 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 319 goto bad; 320 } 321 322 if (ip6_badaddr(ip6)) { 323 IP6_STATINC(IP6_STAT_BADSCOPE); 324 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 325 goto bad; 326 } 327 328 /* 329 * Assume that we can create a fast-forward IP flow entry 330 * based on this packet. 331 */ 332 m->m_flags |= M_CANFASTFWD; 333 334 /* 335 * Run through list of hooks for input packets. If there are any 336 * filters which require that additional packets in the flow are 337 * not fast-forwarded, they must clear the M_CANFASTFWD flag. 338 * Note that filters must _never_ set this flag, as another filter 339 * in the list may have previously cleared it. 340 * 341 * Don't call hooks if the packet has already been processed by 342 * IPsec (encapsulated, tunnel mode). 343 */ 344 #if defined(IPSEC) 345 if (!ipsec_used || !ipsec_indone(m)) 346 #else 347 if (1) 348 #endif 349 { 350 struct in6_addr odst; 351 352 odst = ip6->ip6_dst; 353 if (pfil_run_hooks(inet6_pfil_hook, &m, rcvif, PFIL_IN) != 0) 354 return; 355 if (m == NULL) 356 return; 357 ip6 = mtod(m, struct ip6_hdr *); 358 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst); 359 } 360 361 IP6_STATINC(IP6_STAT_NXTHIST + ip6->ip6_nxt); 362 363 #ifdef ALTQ 364 if (altq_input != NULL) { 365 SOFTNET_LOCK(); 366 if ((*altq_input)(m, AF_INET6) == 0) { 367 SOFTNET_UNLOCK(); 368 /* packet is dropped by traffic conditioner */ 369 return; 370 } 371 SOFTNET_UNLOCK(); 372 } 373 #endif 374 375 /* 376 * Disambiguate address scope zones (if there is ambiguity). 377 * We first make sure that the original source or destination address 378 * is not in our internal form for scoped addresses. Such addresses 379 * are not necessarily invalid spec-wise, but we cannot accept them due 380 * to the usage conflict. 381 * in6_setscope() then also checks and rejects the cases where src or 382 * dst are the loopback address and the receiving interface 383 * is not loopback. 384 */ 385 if (__predict_false( 386 m_makewritable(&m, 0, sizeof(struct ip6_hdr), M_DONTWAIT))) 387 goto bad; 388 ip6 = mtod(m, struct ip6_hdr *); 389 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) { 390 IP6_STATINC(IP6_STAT_BADSCOPE); /* XXX */ 391 goto bad; 392 } 393 if (in6_setscope(&ip6->ip6_src, rcvif, NULL) || 394 in6_setscope(&ip6->ip6_dst, rcvif, NULL)) { 395 IP6_STATINC(IP6_STAT_BADSCOPE); 396 goto bad; 397 } 398 399 ro = percpu_getref(ip6_forward_rt_percpu); 400 401 /* 402 * Multicast check 403 */ 404 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 405 bool ingroup; 406 407 in6_ifstat_inc(rcvif, ifs6_in_mcast); 408 /* 409 * See if we belong to the destination multicast group on the 410 * arrival interface. 411 */ 412 ingroup = in6_multi_group(&ip6->ip6_dst, rcvif); 413 if (ingroup) { 414 ours = 1; 415 } else if (!ip6_mrouter) { 416 uint64_t *ip6s = IP6_STAT_GETREF(); 417 ip6s[IP6_STAT_NOTMEMBER]++; 418 ip6s[IP6_STAT_CANTFORWARD]++; 419 IP6_STAT_PUTREF(); 420 in6_ifstat_inc(rcvif, ifs6_in_discard); 421 goto bad_unref; 422 } 423 deliverifp = rcvif; 424 goto hbhcheck; 425 } 426 427 sockaddr_in6_init(&u.dst6, &ip6->ip6_dst, 0, 0, 0); 428 429 /* 430 * Unicast check 431 */ 432 rt = rtcache_lookup2(ro, &u.dst, 1, &hit); 433 if (hit) 434 IP6_STATINC(IP6_STAT_FORWARD_CACHEHIT); 435 else 436 IP6_STATINC(IP6_STAT_FORWARD_CACHEMISS); 437 438 /* 439 * Accept the packet if the forwarding interface to the destination 440 * (according to the routing table) is the loopback interface, 441 * unless the associated route has a gateway. 442 * 443 * We don't explicitly match ip6_dst against an interface here. It 444 * is already done in rtcache_lookup2: rt->rt_ifp->if_type will be 445 * IFT_LOOP if the packet is for us. 446 * 447 * Note that this approach causes to accept a packet if there is a 448 * route to the loopback interface for the destination of the packet. 449 * But we think it's even useful in some situations, e.g. when using 450 * a special daemon which wants to intercept the packet. 451 */ 452 if (rt != NULL && 453 (rt->rt_flags & (RTF_HOST|RTF_GATEWAY)) == RTF_HOST && 454 rt->rt_ifp->if_type == IFT_LOOP) { 455 struct in6_ifaddr *ia6 = (struct in6_ifaddr *)rt->rt_ifa; 456 int addrok; 457 458 if (ia6->ia6_flags & IN6_IFF_ANYCAST) 459 m->m_flags |= M_ANYCAST6; 460 /* 461 * packets to a tentative, duplicated, or somehow invalid 462 * address must not be accepted. 463 */ 464 if (ia6->ia6_flags & IN6_IFF_NOTREADY) 465 addrok = 0; 466 else if (ia6->ia6_flags & IN6_IFF_DETACHED && 467 !IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) 468 { 469 /* Allow internal traffic to DETACHED addresses */ 470 struct sockaddr_in6 sin6; 471 int s; 472 473 memset(&sin6, 0, sizeof(sin6)); 474 sin6.sin6_family = AF_INET6; 475 sin6.sin6_len = sizeof(sin6); 476 sin6.sin6_addr = ip6->ip6_src; 477 s = pserialize_read_enter(); 478 addrok = (ifa_ifwithaddr(sin6tosa(&sin6)) != NULL); 479 pserialize_read_exit(s); 480 } else 481 addrok = 1; 482 if (addrok) { 483 /* this address is ready */ 484 ours = 1; 485 deliverifp = ia6->ia_ifp; /* correct? */ 486 goto hbhcheck; 487 } else { 488 /* address is not ready, so discard the packet. */ 489 char ip6bufs[INET6_ADDRSTRLEN]; 490 char ip6bufd[INET6_ADDRSTRLEN]; 491 nd6log(LOG_INFO, "packet to an unready address %s->%s\n", 492 IN6_PRINT(ip6bufs, &ip6->ip6_src), 493 IN6_PRINT(ip6bufd, &ip6->ip6_dst)); 494 495 goto bad_unref; 496 } 497 } 498 499 /* 500 * FAITH (Firewall Aided Internet Translator) 501 */ 502 #if defined(NFAITH) && 0 < NFAITH 503 if (ip6_keepfaith) { 504 if (rt != NULL && rt->rt_ifp != NULL && 505 rt->rt_ifp->if_type == IFT_FAITH) { 506 /* XXX do we need more sanity checks? */ 507 ours = 1; 508 deliverifp = rt->rt_ifp; /* faith */ 509 goto hbhcheck; 510 } 511 } 512 #endif 513 514 /* 515 * Now there is no reason to process the packet if it's not our own 516 * and we're not a router. 517 */ 518 if (!ip6_forwarding) { 519 IP6_STATINC(IP6_STAT_CANTFORWARD); 520 in6_ifstat_inc(rcvif, ifs6_in_discard); 521 goto bad_unref; 522 } 523 524 hbhcheck: 525 /* 526 * Record address information into m_tag, if we don't have one yet. 527 * Note that we are unable to record it, if the address is not listed 528 * as our interface address (e.g. multicast addresses, addresses 529 * within FAITH prefixes and such). 530 */ 531 if (deliverifp && ip6_getdstifaddr(m) == NULL) { 532 struct in6_ifaddr *ia6; 533 int s = pserialize_read_enter(); 534 535 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 536 /* Depends on ip6_setdstifaddr never sleep */ 537 if (ia6 != NULL && ip6_setdstifaddr(m, ia6) == NULL) { 538 /* 539 * XXX maybe we should drop the packet here, 540 * as we could not provide enough information 541 * to the upper layers. 542 */ 543 } 544 pserialize_read_exit(s); 545 } 546 547 /* 548 * Process Hop-by-Hop options header if it's contained. 549 * m may be modified in ip6_hopopts_input(). 550 * If a JumboPayload option is included, plen will also be modified. 551 */ 552 plen = (u_int32_t)ntohs(ip6->ip6_plen); 553 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 554 struct ip6_hbh *hbh; 555 556 if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) { 557 /* m already freed */ 558 in6_ifstat_inc(rcvif, ifs6_in_discard); 559 rtcache_unref(rt, ro); 560 percpu_putref(ip6_forward_rt_percpu); 561 return; 562 } 563 564 /* adjust pointer */ 565 ip6 = mtod(m, struct ip6_hdr *); 566 567 /* 568 * if the payload length field is 0 and the next header field 569 * indicates Hop-by-Hop Options header, then a Jumbo Payload 570 * option MUST be included. 571 */ 572 if (ip6->ip6_plen == 0 && plen == 0) { 573 /* 574 * Note that if a valid jumbo payload option is 575 * contained, ip6_hopopts_input() must set a valid 576 * (non-zero) payload length to the variable plen. 577 */ 578 IP6_STATINC(IP6_STAT_BADOPTIONS); 579 in6_ifstat_inc(rcvif, ifs6_in_discard); 580 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 581 icmp6_error(m, ICMP6_PARAM_PROB, 582 ICMP6_PARAMPROB_HEADER, 583 (char *)&ip6->ip6_plen - (char *)ip6); 584 rtcache_unref(rt, ro); 585 percpu_putref(ip6_forward_rt_percpu); 586 return; 587 } 588 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 589 sizeof(struct ip6_hbh)); 590 if (hbh == NULL) { 591 IP6_STATINC(IP6_STAT_TOOSHORT); 592 rtcache_unref(rt, ro); 593 percpu_putref(ip6_forward_rt_percpu); 594 return; 595 } 596 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 597 nxt = hbh->ip6h_nxt; 598 599 /* 600 * accept the packet if a router alert option is included 601 * and we act as an IPv6 router. 602 */ 603 if (rtalert != ~0 && ip6_forwarding) 604 ours = 1; 605 } else 606 nxt = ip6->ip6_nxt; 607 608 /* 609 * Check that the amount of data in the buffers is at least much as 610 * the IPv6 header would have us expect. Trim mbufs if longer than we 611 * expect. Drop packet if shorter than we expect. 612 */ 613 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 614 IP6_STATINC(IP6_STAT_TOOSHORT); 615 in6_ifstat_inc(rcvif, ifs6_in_truncated); 616 goto bad_unref; 617 } 618 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 619 if (m->m_len == m->m_pkthdr.len) { 620 m->m_len = sizeof(struct ip6_hdr) + plen; 621 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 622 } else 623 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 624 } 625 626 /* 627 * Forward if desirable. 628 */ 629 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 630 /* 631 * If we are acting as a multicast router, all 632 * incoming multicast packets are passed to the 633 * kernel-level multicast forwarding function. 634 * The packet is returned (relatively) intact; if 635 * ip6_mforward() returns a non-zero value, the packet 636 * must be discarded, else it may be accepted below. 637 */ 638 if (ip6_mrouter != NULL) { 639 int error; 640 641 SOFTNET_LOCK(); 642 error = ip6_mforward(ip6, rcvif, m); 643 SOFTNET_UNLOCK(); 644 645 if (error != 0) { 646 rtcache_unref(rt, ro); 647 percpu_putref(ip6_forward_rt_percpu); 648 IP6_STATINC(IP6_STAT_CANTFORWARD); 649 goto bad; 650 } 651 } 652 if (!ours) 653 goto bad_unref; 654 } else if (!ours) { 655 rtcache_unref(rt, ro); 656 percpu_putref(ip6_forward_rt_percpu); 657 ip6_forward(m, srcrt); 658 return; 659 } 660 661 ip6 = mtod(m, struct ip6_hdr *); 662 663 /* 664 * Malicious party may be able to use IPv4 mapped addr to confuse 665 * tcp/udp stack and bypass security checks (act as if it was from 666 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious. 667 * 668 * For SIIT end node behavior, you may want to disable the check. 669 * However, you will become vulnerable to attacks using IPv4 mapped 670 * source. 671 */ 672 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 673 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 674 IP6_STATINC(IP6_STAT_BADSCOPE); 675 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 676 goto bad_unref; 677 } 678 679 #ifdef IFA_STATS 680 if (deliverifp != NULL) { 681 struct in6_ifaddr *ia6; 682 int s = pserialize_read_enter(); 683 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 684 if (ia6) 685 ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len; 686 pserialize_read_exit(s); 687 } 688 #endif 689 IP6_STATINC(IP6_STAT_DELIVERED); 690 in6_ifstat_inc(deliverifp, ifs6_in_deliver); 691 nest = 0; 692 693 if (rt != NULL) { 694 rtcache_unref(rt, ro); 695 rt = NULL; 696 } 697 percpu_putref(ip6_forward_rt_percpu); 698 699 rh_present = 0; 700 frg_present = 0; 701 while (nxt != IPPROTO_DONE) { 702 if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) { 703 IP6_STATINC(IP6_STAT_TOOMANYHDR); 704 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 705 goto bad; 706 } 707 708 M_VERIFY_PACKET(m); 709 710 /* 711 * protection against faulty packet - there should be 712 * more sanity checks in header chain processing. 713 */ 714 if (m->m_pkthdr.len < off) { 715 IP6_STATINC(IP6_STAT_TOOSHORT); 716 in6_ifstat_inc(rcvif, ifs6_in_truncated); 717 goto bad; 718 } 719 720 if (nxt == IPPROTO_ROUTING) { 721 if (rh_present++) { 722 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 723 IP6_STATINC(IP6_STAT_BADOPTIONS); 724 goto bad; 725 } 726 } else if (nxt == IPPROTO_FRAGMENT) { 727 if (frg_present++) { 728 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 729 IP6_STATINC(IP6_STAT_BADOPTIONS); 730 goto bad; 731 } 732 } 733 734 #ifdef IPSEC 735 if (ipsec_used) { 736 /* 737 * Enforce IPsec policy checking if we are seeing last 738 * header. Note that we do not visit this with 739 * protocols with pcb layer code - like udp/tcp/raw ip. 740 */ 741 if ((inet6sw[ip_protox[nxt]].pr_flags 742 & PR_LASTHDR) != 0) { 743 int error; 744 745 error = ipsec_ip_input(m, false); 746 if (error) 747 goto bad; 748 } 749 } 750 #endif 751 752 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt); 753 } 754 return; 755 756 bad_unref: 757 rtcache_unref(rt, ro); 758 percpu_putref(ip6_forward_rt_percpu); 759 bad: 760 m_freem(m); 761 return; 762 } 763 764 static bool 765 ip6_badaddr(struct ip6_hdr *ip6) 766 { 767 /* Check against address spoofing/corruption. */ 768 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) || 769 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) { 770 return true; 771 } 772 773 /* 774 * The following check is not documented in specs. A malicious 775 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack 776 * and bypass security checks (act as if it was from 127.0.0.1 by using 777 * IPv6 src ::ffff:127.0.0.1). Be cautious. 778 * 779 * This check chokes if we are in an SIIT cloud. As none of BSDs 780 * support IPv4-less kernel compilation, we cannot support SIIT 781 * environment at all. So, it makes more sense for us to reject any 782 * malicious packets for non-SIIT environment, than try to do a 783 * partial support for SIIT environment. 784 */ 785 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 786 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 787 return true; 788 } 789 790 /* 791 * Reject packets with IPv4-compatible IPv6 addresses (RFC4291). 792 */ 793 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) || 794 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) { 795 return true; 796 } 797 798 return false; 799 } 800 801 /* 802 * set/grab in6_ifaddr correspond to IPv6 destination address. 803 */ 804 static struct m_tag * 805 ip6_setdstifaddr(struct mbuf *m, const struct in6_ifaddr *ia) 806 { 807 struct m_tag *mtag; 808 struct ip6aux *ip6a; 809 810 mtag = ip6_addaux(m); 811 if (mtag == NULL) 812 return NULL; 813 814 ip6a = (struct ip6aux *)(mtag + 1); 815 if (in6_setscope(&ip6a->ip6a_src, ia->ia_ifp, &ip6a->ip6a_scope_id)) { 816 IP6_STATINC(IP6_STAT_BADSCOPE); 817 return NULL; 818 } 819 820 ip6a->ip6a_src = ia->ia_addr.sin6_addr; 821 ip6a->ip6a_flags = ia->ia6_flags; 822 return mtag; 823 } 824 825 const struct ip6aux * 826 ip6_getdstifaddr(struct mbuf *m) 827 { 828 struct m_tag *mtag; 829 830 mtag = ip6_findaux(m); 831 if (mtag != NULL) 832 return (struct ip6aux *)(mtag + 1); 833 else 834 return NULL; 835 } 836 837 /* 838 * Hop-by-Hop options header processing. If a valid jumbo payload option is 839 * included, the real payload length will be stored in plenp. 840 * 841 * rtalertp - XXX: should be stored more smart way 842 */ 843 int 844 ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp, 845 struct mbuf **mp, int *offp) 846 { 847 struct mbuf *m = *mp; 848 int off = *offp, hbhlen; 849 struct ip6_hbh *hbh; 850 851 /* validation of the length of the header */ 852 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, 853 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh)); 854 if (hbh == NULL) { 855 IP6_STATINC(IP6_STAT_TOOSHORT); 856 return -1; 857 } 858 hbhlen = (hbh->ip6h_len + 1) << 3; 859 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 860 hbhlen); 861 if (hbh == NULL) { 862 IP6_STATINC(IP6_STAT_TOOSHORT); 863 return -1; 864 } 865 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 866 off += hbhlen; 867 hbhlen -= sizeof(struct ip6_hbh); 868 869 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 870 hbhlen, rtalertp, plenp) < 0) 871 return -1; 872 873 *offp = off; 874 *mp = m; 875 return 0; 876 } 877 878 /* 879 * Search header for all Hop-by-hop options and process each option. 880 * This function is separate from ip6_hopopts_input() in order to 881 * handle a case where the sending node itself process its hop-by-hop 882 * options header. In such a case, the function is called from ip6_output(). 883 * 884 * The function assumes that hbh header is located right after the IPv6 header 885 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to 886 * opthead + hbhlen is located in continuous memory region. 887 */ 888 static int 889 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen, 890 u_int32_t *rtalertp, u_int32_t *plenp) 891 { 892 struct ip6_hdr *ip6; 893 int optlen = 0; 894 u_int8_t *opt = opthead; 895 u_int16_t rtalert_val; 896 u_int32_t jumboplen; 897 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh); 898 899 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 900 switch (*opt) { 901 case IP6OPT_PAD1: 902 optlen = 1; 903 break; 904 case IP6OPT_PADN: 905 if (hbhlen < IP6OPT_MINLEN) { 906 IP6_STATINC(IP6_STAT_TOOSMALL); 907 goto bad; 908 } 909 optlen = *(opt + 1) + 2; 910 break; 911 case IP6OPT_RTALERT: 912 /* XXX may need check for alignment */ 913 if (hbhlen < IP6OPT_RTALERT_LEN) { 914 IP6_STATINC(IP6_STAT_TOOSMALL); 915 goto bad; 916 } 917 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) { 918 /* XXX stat */ 919 icmp6_error(m, ICMP6_PARAM_PROB, 920 ICMP6_PARAMPROB_HEADER, 921 erroff + opt + 1 - opthead); 922 return (-1); 923 } 924 optlen = IP6OPT_RTALERT_LEN; 925 memcpy((void *)&rtalert_val, (void *)(opt + 2), 2); 926 *rtalertp = ntohs(rtalert_val); 927 break; 928 case IP6OPT_JUMBO: 929 /* XXX may need check for alignment */ 930 if (hbhlen < IP6OPT_JUMBO_LEN) { 931 IP6_STATINC(IP6_STAT_TOOSMALL); 932 goto bad; 933 } 934 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) { 935 /* XXX stat */ 936 icmp6_error(m, ICMP6_PARAM_PROB, 937 ICMP6_PARAMPROB_HEADER, 938 erroff + opt + 1 - opthead); 939 return (-1); 940 } 941 optlen = IP6OPT_JUMBO_LEN; 942 943 /* 944 * IPv6 packets that have non 0 payload length 945 * must not contain a jumbo payload option. 946 */ 947 ip6 = mtod(m, struct ip6_hdr *); 948 if (ip6->ip6_plen) { 949 IP6_STATINC(IP6_STAT_BADOPTIONS); 950 icmp6_error(m, ICMP6_PARAM_PROB, 951 ICMP6_PARAMPROB_HEADER, 952 erroff + opt - opthead); 953 return (-1); 954 } 955 956 /* 957 * We may see jumbolen in unaligned location, so 958 * we'd need to perform memcpy(). 959 */ 960 memcpy(&jumboplen, opt + 2, sizeof(jumboplen)); 961 jumboplen = (u_int32_t)htonl(jumboplen); 962 963 #if 1 964 /* 965 * if there are multiple jumbo payload options, 966 * *plenp will be non-zero and the packet will be 967 * rejected. 968 * the behavior may need some debate in ipngwg - 969 * multiple options does not make sense, however, 970 * there's no explicit mention in specification. 971 */ 972 if (*plenp != 0) { 973 IP6_STATINC(IP6_STAT_BADOPTIONS); 974 icmp6_error(m, ICMP6_PARAM_PROB, 975 ICMP6_PARAMPROB_HEADER, 976 erroff + opt + 2 - opthead); 977 return (-1); 978 } 979 #endif 980 981 /* 982 * jumbo payload length must be larger than 65535. 983 */ 984 if (jumboplen <= IPV6_MAXPACKET) { 985 IP6_STATINC(IP6_STAT_BADOPTIONS); 986 icmp6_error(m, ICMP6_PARAM_PROB, 987 ICMP6_PARAMPROB_HEADER, 988 erroff + opt + 2 - opthead); 989 return (-1); 990 } 991 *plenp = jumboplen; 992 993 break; 994 default: /* unknown option */ 995 if (hbhlen < IP6OPT_MINLEN) { 996 IP6_STATINC(IP6_STAT_TOOSMALL); 997 goto bad; 998 } 999 optlen = ip6_unknown_opt(opt, m, 1000 erroff + opt - opthead); 1001 if (optlen == -1) 1002 return (-1); 1003 optlen += 2; 1004 break; 1005 } 1006 } 1007 1008 return (0); 1009 1010 bad: 1011 m_freem(m); 1012 return (-1); 1013 } 1014 1015 /* 1016 * Unknown option processing. 1017 * The third argument `off' is the offset from the IPv6 header to the option, 1018 * which is necessary if the IPv6 header the and option header and IPv6 header 1019 * is not continuous in order to return an ICMPv6 error. 1020 */ 1021 int 1022 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off) 1023 { 1024 struct ip6_hdr *ip6; 1025 1026 switch (IP6OPT_TYPE(*optp)) { 1027 case IP6OPT_TYPE_SKIP: /* ignore the option */ 1028 return ((int)*(optp + 1)); 1029 case IP6OPT_TYPE_DISCARD: /* silently discard */ 1030 m_freem(m); 1031 return (-1); 1032 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 1033 IP6_STATINC(IP6_STAT_BADOPTIONS); 1034 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 1035 return (-1); 1036 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 1037 IP6_STATINC(IP6_STAT_BADOPTIONS); 1038 ip6 = mtod(m, struct ip6_hdr *); 1039 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 1040 (m->m_flags & (M_BCAST|M_MCAST))) 1041 m_freem(m); 1042 else 1043 icmp6_error(m, ICMP6_PARAM_PROB, 1044 ICMP6_PARAMPROB_OPTION, off); 1045 return (-1); 1046 } 1047 1048 m_freem(m); /* XXX: NOTREACHED */ 1049 return (-1); 1050 } 1051 1052 /* 1053 * Create the "control" list for this pcb. 1054 * 1055 * The routine will be called from upper layer handlers like tcp6_input(). 1056 * Thus the routine assumes that the caller (tcp6_input) have already 1057 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the 1058 * very first mbuf on the mbuf chain. 1059 * We may want to add some infinite loop prevention or sanity checks for safety. 1060 * (This applies only when you are using KAME mbuf chain restriction, i.e. 1061 * you are using IP6_EXTHDR_CHECK() not m_pulldown()) 1062 */ 1063 void 1064 ip6_savecontrol(struct in6pcb *in6p, struct mbuf **mp, 1065 struct ip6_hdr *ip6, struct mbuf *m) 1066 { 1067 struct socket *so = in6p->in6p_socket; 1068 #ifdef RFC2292 1069 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y)) 1070 #else 1071 #define IS2292(x, y) (y) 1072 #endif 1073 1074 if (SOOPT_TIMESTAMP(so->so_options)) 1075 mp = sbsavetimestamp(so->so_options, mp); 1076 1077 /* some OSes call this logic with IPv4 packet, for SO_TIMESTAMP */ 1078 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) 1079 return; 1080 1081 /* RFC 2292 sec. 5 */ 1082 if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) { 1083 struct in6_pktinfo pi6; 1084 1085 memcpy(&pi6.ipi6_addr, &ip6->ip6_dst, sizeof(struct in6_addr)); 1086 in6_clearscope(&pi6.ipi6_addr); /* XXX */ 1087 pi6.ipi6_ifindex = m->m_pkthdr.rcvif_index; 1088 *mp = sbcreatecontrol(&pi6, sizeof(pi6), 1089 IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6); 1090 if (*mp) 1091 mp = &(*mp)->m_next; 1092 } 1093 1094 if (in6p->in6p_flags & IN6P_HOPLIMIT) { 1095 int hlim = ip6->ip6_hlim & 0xff; 1096 1097 *mp = sbcreatecontrol(&hlim, sizeof(hlim), 1098 IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6); 1099 if (*mp) 1100 mp = &(*mp)->m_next; 1101 } 1102 1103 if ((in6p->in6p_flags & IN6P_TCLASS) != 0) { 1104 u_int32_t flowinfo; 1105 int tclass; 1106 1107 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK); 1108 flowinfo >>= 20; 1109 1110 tclass = flowinfo & 0xff; 1111 *mp = sbcreatecontrol(&tclass, sizeof(tclass), 1112 IPV6_TCLASS, IPPROTO_IPV6); 1113 1114 if (*mp) 1115 mp = &(*mp)->m_next; 1116 } 1117 1118 /* 1119 * IPV6_HOPOPTS socket option. Recall that we required super-user 1120 * privilege for the option (see ip6_ctloutput), but it might be too 1121 * strict, since there might be some hop-by-hop options which can be 1122 * returned to normal user. 1123 * See also RFC3542 section 8 (or RFC2292 section 6). 1124 */ 1125 if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0) { 1126 /* 1127 * Check if a hop-by-hop options header is contatined in the 1128 * received packet, and if so, store the options as ancillary 1129 * data. Note that a hop-by-hop options header must be 1130 * just after the IPv6 header, which fact is assured through 1131 * the IPv6 input processing. 1132 */ 1133 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1134 if (xip6->ip6_nxt == IPPROTO_HOPOPTS) { 1135 struct ip6_hbh *hbh; 1136 int hbhlen; 1137 struct mbuf *ext; 1138 1139 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr), 1140 xip6->ip6_nxt); 1141 if (ext == NULL) { 1142 IP6_STATINC(IP6_STAT_TOOSHORT); 1143 return; 1144 } 1145 hbh = mtod(ext, struct ip6_hbh *); 1146 hbhlen = (hbh->ip6h_len + 1) << 3; 1147 if (hbhlen != ext->m_len) { 1148 m_freem(ext); 1149 IP6_STATINC(IP6_STAT_TOOSHORT); 1150 return; 1151 } 1152 1153 /* 1154 * XXX: We copy whole the header even if a jumbo 1155 * payload option is included, which option is to 1156 * be removed before returning in the RFC 2292. 1157 * Note: this constraint is removed in RFC3542. 1158 */ 1159 *mp = sbcreatecontrol(hbh, hbhlen, 1160 IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS), 1161 IPPROTO_IPV6); 1162 if (*mp) 1163 mp = &(*mp)->m_next; 1164 m_freem(ext); 1165 } 1166 } 1167 1168 /* IPV6_DSTOPTS and IPV6_RTHDR socket options */ 1169 if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) { 1170 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1171 int nxt = xip6->ip6_nxt, off = sizeof(struct ip6_hdr); 1172 1173 /* 1174 * Search for destination options headers or routing 1175 * header(s) through the header chain, and stores each 1176 * header as ancillary data. 1177 * Note that the order of the headers remains in 1178 * the chain of ancillary data. 1179 */ 1180 for (;;) { /* is explicit loop prevention necessary? */ 1181 struct ip6_ext *ip6e = NULL; 1182 int elen; 1183 struct mbuf *ext = NULL; 1184 1185 /* 1186 * if it is not an extension header, don't try to 1187 * pull it from the chain. 1188 */ 1189 switch (nxt) { 1190 case IPPROTO_DSTOPTS: 1191 case IPPROTO_ROUTING: 1192 case IPPROTO_HOPOPTS: 1193 case IPPROTO_AH: /* is it possible? */ 1194 break; 1195 default: 1196 goto loopend; 1197 } 1198 1199 ext = ip6_pullexthdr(m, off, nxt); 1200 if (ext == NULL) { 1201 IP6_STATINC(IP6_STAT_TOOSHORT); 1202 return; 1203 } 1204 ip6e = mtod(ext, struct ip6_ext *); 1205 if (nxt == IPPROTO_AH) 1206 elen = (ip6e->ip6e_len + 2) << 2; 1207 else 1208 elen = (ip6e->ip6e_len + 1) << 3; 1209 if (elen != ext->m_len) { 1210 m_freem(ext); 1211 IP6_STATINC(IP6_STAT_TOOSHORT); 1212 return; 1213 } 1214 KASSERT(IP6_HDR_ALIGNED_P(ip6e)); 1215 1216 switch (nxt) { 1217 case IPPROTO_DSTOPTS: 1218 if (!(in6p->in6p_flags & IN6P_DSTOPTS)) 1219 break; 1220 1221 *mp = sbcreatecontrol(ip6e, elen, 1222 IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS), 1223 IPPROTO_IPV6); 1224 if (*mp) 1225 mp = &(*mp)->m_next; 1226 break; 1227 1228 case IPPROTO_ROUTING: 1229 if (!(in6p->in6p_flags & IN6P_RTHDR)) 1230 break; 1231 1232 *mp = sbcreatecontrol(ip6e, elen, 1233 IS2292(IPV6_2292RTHDR, IPV6_RTHDR), 1234 IPPROTO_IPV6); 1235 if (*mp) 1236 mp = &(*mp)->m_next; 1237 break; 1238 1239 case IPPROTO_HOPOPTS: 1240 case IPPROTO_AH: /* is it possible? */ 1241 break; 1242 1243 default: 1244 /* 1245 * other cases have been filtered in the above. 1246 * none will visit this case. here we supply 1247 * the code just in case (nxt overwritten or 1248 * other cases). 1249 */ 1250 m_freem(ext); 1251 goto loopend; 1252 1253 } 1254 1255 /* proceed with the next header. */ 1256 off += elen; 1257 nxt = ip6e->ip6e_nxt; 1258 ip6e = NULL; 1259 m_freem(ext); 1260 ext = NULL; 1261 } 1262 loopend: 1263 ; 1264 } 1265 } 1266 #undef IS2292 1267 1268 1269 void 1270 ip6_notify_pmtu(struct in6pcb *in6p, const struct sockaddr_in6 *dst, 1271 uint32_t *mtu) 1272 { 1273 struct socket *so; 1274 struct mbuf *m_mtu; 1275 struct ip6_mtuinfo mtuctl; 1276 1277 so = in6p->in6p_socket; 1278 1279 if (mtu == NULL) 1280 return; 1281 1282 KASSERT(so != NULL); 1283 1284 memset(&mtuctl, 0, sizeof(mtuctl)); /* zero-clear for safety */ 1285 mtuctl.ip6m_mtu = *mtu; 1286 mtuctl.ip6m_addr = *dst; 1287 if (sa6_recoverscope(&mtuctl.ip6m_addr)) 1288 return; 1289 1290 if ((m_mtu = sbcreatecontrol(&mtuctl, sizeof(mtuctl), 1291 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL) 1292 return; 1293 1294 if (sbappendaddr(&so->so_rcv, (const struct sockaddr *)dst, NULL, m_mtu) 1295 == 0) { 1296 soroverflow(so); 1297 m_freem(m_mtu); 1298 } else 1299 sorwakeup(so); 1300 1301 return; 1302 } 1303 1304 /* 1305 * pull single extension header from mbuf chain. returns single mbuf that 1306 * contains the result, or NULL on error. 1307 */ 1308 static struct mbuf * 1309 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt) 1310 { 1311 struct ip6_ext ip6e; 1312 size_t elen; 1313 struct mbuf *n; 1314 1315 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1316 if (nxt == IPPROTO_AH) 1317 elen = (ip6e.ip6e_len + 2) << 2; 1318 else 1319 elen = (ip6e.ip6e_len + 1) << 3; 1320 1321 MGET(n, M_DONTWAIT, MT_DATA); 1322 if (n && elen >= MLEN) { 1323 MCLGET(n, M_DONTWAIT); 1324 if ((n->m_flags & M_EXT) == 0) { 1325 m_free(n); 1326 n = NULL; 1327 } 1328 } 1329 if (!n) 1330 return NULL; 1331 1332 n->m_len = 0; 1333 if (elen >= M_TRAILINGSPACE(n)) { 1334 m_free(n); 1335 return NULL; 1336 } 1337 1338 m_copydata(m, off, elen, mtod(n, void *)); 1339 n->m_len = elen; 1340 return n; 1341 } 1342 1343 /* 1344 * Get offset to the previous header followed by the header 1345 * currently processed. 1346 */ 1347 int 1348 ip6_get_prevhdr(struct mbuf *m, int off) 1349 { 1350 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1351 1352 if (off == sizeof(struct ip6_hdr)) { 1353 return offsetof(struct ip6_hdr, ip6_nxt); 1354 } else if (off < sizeof(struct ip6_hdr)) { 1355 panic("%s: off < sizeof(struct ip6_hdr)", __func__); 1356 } else { 1357 int len, nlen, nxt; 1358 struct ip6_ext ip6e; 1359 1360 nxt = ip6->ip6_nxt; 1361 len = sizeof(struct ip6_hdr); 1362 nlen = 0; 1363 while (len < off) { 1364 m_copydata(m, len, sizeof(ip6e), &ip6e); 1365 1366 switch (nxt) { 1367 case IPPROTO_FRAGMENT: 1368 nlen = sizeof(struct ip6_frag); 1369 break; 1370 case IPPROTO_AH: 1371 nlen = (ip6e.ip6e_len + 2) << 2; 1372 break; 1373 default: 1374 nlen = (ip6e.ip6e_len + 1) << 3; 1375 break; 1376 } 1377 len += nlen; 1378 nxt = ip6e.ip6e_nxt; 1379 } 1380 1381 return (len - nlen); 1382 } 1383 } 1384 1385 /* 1386 * get next header offset. m will be retained. 1387 */ 1388 int 1389 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp) 1390 { 1391 struct ip6_hdr ip6; 1392 struct ip6_ext ip6e; 1393 struct ip6_frag fh; 1394 1395 /* just in case */ 1396 if (m == NULL) 1397 panic("%s: m == NULL", __func__); 1398 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off) 1399 return -1; 1400 1401 switch (proto) { 1402 case IPPROTO_IPV6: 1403 /* do not chase beyond intermediate IPv6 headers */ 1404 if (off != 0) 1405 return -1; 1406 if (m->m_pkthdr.len < off + sizeof(ip6)) 1407 return -1; 1408 m_copydata(m, off, sizeof(ip6), (void *)&ip6); 1409 if (nxtp) 1410 *nxtp = ip6.ip6_nxt; 1411 off += sizeof(ip6); 1412 return off; 1413 1414 case IPPROTO_FRAGMENT: 1415 /* 1416 * terminate parsing if it is not the first fragment, 1417 * it does not make sense to parse through it. 1418 */ 1419 if (m->m_pkthdr.len < off + sizeof(fh)) 1420 return -1; 1421 m_copydata(m, off, sizeof(fh), (void *)&fh); 1422 if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0) 1423 return -1; 1424 if (nxtp) 1425 *nxtp = fh.ip6f_nxt; 1426 off += sizeof(struct ip6_frag); 1427 return off; 1428 1429 case IPPROTO_AH: 1430 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1431 return -1; 1432 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1433 if (nxtp) 1434 *nxtp = ip6e.ip6e_nxt; 1435 off += (ip6e.ip6e_len + 2) << 2; 1436 if (m->m_pkthdr.len < off) 1437 return -1; 1438 return off; 1439 1440 case IPPROTO_HOPOPTS: 1441 case IPPROTO_ROUTING: 1442 case IPPROTO_DSTOPTS: 1443 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1444 return -1; 1445 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1446 if (nxtp) 1447 *nxtp = ip6e.ip6e_nxt; 1448 off += (ip6e.ip6e_len + 1) << 3; 1449 if (m->m_pkthdr.len < off) 1450 return -1; 1451 return off; 1452 1453 case IPPROTO_NONE: 1454 case IPPROTO_ESP: 1455 case IPPROTO_IPCOMP: 1456 /* give up */ 1457 return -1; 1458 1459 default: 1460 return -1; 1461 } 1462 } 1463 1464 /* 1465 * get offset for the last header in the chain. m will be kept untainted. 1466 */ 1467 int 1468 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp) 1469 { 1470 int newoff; 1471 int nxt; 1472 1473 if (!nxtp) { 1474 nxt = -1; 1475 nxtp = &nxt; 1476 } 1477 for (;;) { 1478 newoff = ip6_nexthdr(m, off, proto, nxtp); 1479 if (newoff < 0) 1480 return off; 1481 else if (newoff < off) 1482 return -1; /* invalid */ 1483 else if (newoff == off) 1484 return newoff; 1485 1486 off = newoff; 1487 proto = *nxtp; 1488 } 1489 } 1490 1491 struct m_tag * 1492 ip6_addaux(struct mbuf *m) 1493 { 1494 struct m_tag *mtag; 1495 1496 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1497 if (!mtag) { 1498 mtag = m_tag_get(PACKET_TAG_INET6, sizeof(struct ip6aux), 1499 M_NOWAIT); 1500 if (mtag) { 1501 m_tag_prepend(m, mtag); 1502 memset(mtag + 1, 0, sizeof(struct ip6aux)); 1503 } 1504 } 1505 return mtag; 1506 } 1507 1508 struct m_tag * 1509 ip6_findaux(struct mbuf *m) 1510 { 1511 struct m_tag *mtag; 1512 1513 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1514 return mtag; 1515 } 1516 1517 void 1518 ip6_delaux(struct mbuf *m) 1519 { 1520 struct m_tag *mtag; 1521 1522 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1523 if (mtag) 1524 m_tag_delete(m, mtag); 1525 } 1526 1527 /* 1528 * System control for IP6 1529 */ 1530 1531 const u_char inet6ctlerrmap[PRC_NCMDS] = { 1532 0, 0, 0, 0, 1533 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 1534 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 1535 EMSGSIZE, EHOSTUNREACH, 0, 0, 1536 0, 0, 0, 0, 1537 ENOPROTOOPT 1538 }; 1539 1540 extern int sysctl_net_inet6_addrctlpolicy(SYSCTLFN_ARGS); 1541 1542 static int 1543 sysctl_net_inet6_ip6_stats(SYSCTLFN_ARGS) 1544 { 1545 1546 return (NETSTAT_SYSCTL(ip6stat_percpu, IP6_NSTATS)); 1547 } 1548 1549 static void 1550 sysctl_net_inet6_ip6_setup(struct sysctllog **clog) 1551 { 1552 1553 sysctl_createv(clog, 0, NULL, NULL, 1554 CTLFLAG_PERMANENT, 1555 CTLTYPE_NODE, "inet6", 1556 SYSCTL_DESCR("PF_INET6 related settings"), 1557 NULL, 0, NULL, 0, 1558 CTL_NET, PF_INET6, CTL_EOL); 1559 sysctl_createv(clog, 0, NULL, NULL, 1560 CTLFLAG_PERMANENT, 1561 CTLTYPE_NODE, "ip6", 1562 SYSCTL_DESCR("IPv6 related settings"), 1563 NULL, 0, NULL, 0, 1564 CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_EOL); 1565 1566 sysctl_createv(clog, 0, NULL, NULL, 1567 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1568 CTLTYPE_INT, "forwarding", 1569 SYSCTL_DESCR("Enable forwarding of INET6 datagrams"), 1570 NULL, 0, &ip6_forwarding, 0, 1571 CTL_NET, PF_INET6, IPPROTO_IPV6, 1572 IPV6CTL_FORWARDING, CTL_EOL); 1573 sysctl_createv(clog, 0, NULL, NULL, 1574 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1575 CTLTYPE_INT, "redirect", 1576 SYSCTL_DESCR("Enable sending of ICMPv6 redirect messages"), 1577 NULL, 0, &ip6_sendredirects, 0, 1578 CTL_NET, PF_INET6, IPPROTO_IPV6, 1579 IPV6CTL_SENDREDIRECTS, CTL_EOL); 1580 sysctl_createv(clog, 0, NULL, NULL, 1581 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1582 CTLTYPE_INT, "hlim", 1583 SYSCTL_DESCR("Hop limit for an INET6 datagram"), 1584 NULL, 0, &ip6_defhlim, 0, 1585 CTL_NET, PF_INET6, IPPROTO_IPV6, 1586 IPV6CTL_DEFHLIM, CTL_EOL); 1587 sysctl_createv(clog, 0, NULL, NULL, 1588 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1589 CTLTYPE_INT, "maxfragpackets", 1590 SYSCTL_DESCR("Maximum number of fragments to buffer " 1591 "for reassembly"), 1592 NULL, 0, &ip6_maxfragpackets, 0, 1593 CTL_NET, PF_INET6, IPPROTO_IPV6, 1594 IPV6CTL_MAXFRAGPACKETS, CTL_EOL); 1595 sysctl_createv(clog, 0, NULL, NULL, 1596 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1597 CTLTYPE_INT, "accept_rtadv", 1598 SYSCTL_DESCR("Accept router advertisements"), 1599 NULL, 0, &ip6_accept_rtadv, 0, 1600 CTL_NET, PF_INET6, IPPROTO_IPV6, 1601 IPV6CTL_ACCEPT_RTADV, CTL_EOL); 1602 sysctl_createv(clog, 0, NULL, NULL, 1603 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1604 CTLTYPE_INT, "rtadv_maxroutes", 1605 SYSCTL_DESCR("Maximum number of routes accepted via router advertisements"), 1606 NULL, 0, &ip6_rtadv_maxroutes, 0, 1607 CTL_NET, PF_INET6, IPPROTO_IPV6, 1608 IPV6CTL_RTADV_MAXROUTES, CTL_EOL); 1609 sysctl_createv(clog, 0, NULL, NULL, 1610 CTLFLAG_PERMANENT, 1611 CTLTYPE_INT, "rtadv_numroutes", 1612 SYSCTL_DESCR("Current number of routes accepted via router advertisements"), 1613 NULL, 0, &nd6_numroutes, 0, 1614 CTL_NET, PF_INET6, IPPROTO_IPV6, 1615 IPV6CTL_RTADV_NUMROUTES, CTL_EOL); 1616 sysctl_createv(clog, 0, NULL, NULL, 1617 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1618 CTLTYPE_INT, "keepfaith", 1619 SYSCTL_DESCR("Activate faith interface"), 1620 NULL, 0, &ip6_keepfaith, 0, 1621 CTL_NET, PF_INET6, IPPROTO_IPV6, 1622 IPV6CTL_KEEPFAITH, CTL_EOL); 1623 sysctl_createv(clog, 0, NULL, NULL, 1624 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1625 CTLTYPE_INT, "log_interval", 1626 SYSCTL_DESCR("Minimum interval between logging " 1627 "unroutable packets"), 1628 NULL, 0, &ip6_log_interval, 0, 1629 CTL_NET, PF_INET6, IPPROTO_IPV6, 1630 IPV6CTL_LOG_INTERVAL, CTL_EOL); 1631 sysctl_createv(clog, 0, NULL, NULL, 1632 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1633 CTLTYPE_INT, "hdrnestlimit", 1634 SYSCTL_DESCR("Maximum number of nested IPv6 headers"), 1635 NULL, 0, &ip6_hdrnestlimit, 0, 1636 CTL_NET, PF_INET6, IPPROTO_IPV6, 1637 IPV6CTL_HDRNESTLIMIT, CTL_EOL); 1638 sysctl_createv(clog, 0, NULL, NULL, 1639 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1640 CTLTYPE_INT, "dad_count", 1641 SYSCTL_DESCR("Number of Duplicate Address Detection " 1642 "probes to send"), 1643 NULL, 0, &ip6_dad_count, 0, 1644 CTL_NET, PF_INET6, IPPROTO_IPV6, 1645 IPV6CTL_DAD_COUNT, CTL_EOL); 1646 sysctl_createv(clog, 0, NULL, NULL, 1647 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1648 CTLTYPE_INT, "auto_flowlabel", 1649 SYSCTL_DESCR("Assign random IPv6 flow labels"), 1650 NULL, 0, &ip6_auto_flowlabel, 0, 1651 CTL_NET, PF_INET6, IPPROTO_IPV6, 1652 IPV6CTL_AUTO_FLOWLABEL, CTL_EOL); 1653 sysctl_createv(clog, 0, NULL, NULL, 1654 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1655 CTLTYPE_INT, "defmcasthlim", 1656 SYSCTL_DESCR("Default multicast hop limit"), 1657 NULL, 0, &ip6_defmcasthlim, 0, 1658 CTL_NET, PF_INET6, IPPROTO_IPV6, 1659 IPV6CTL_DEFMCASTHLIM, CTL_EOL); 1660 sysctl_createv(clog, 0, NULL, NULL, 1661 CTLFLAG_PERMANENT, 1662 CTLTYPE_STRING, "kame_version", 1663 SYSCTL_DESCR("KAME Version"), 1664 NULL, 0, __UNCONST(__KAME_VERSION), 0, 1665 CTL_NET, PF_INET6, IPPROTO_IPV6, 1666 IPV6CTL_KAME_VERSION, CTL_EOL); 1667 sysctl_createv(clog, 0, NULL, NULL, 1668 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1669 CTLTYPE_INT, "use_deprecated", 1670 SYSCTL_DESCR("Allow use of deprecated addresses as " 1671 "source addresses"), 1672 NULL, 0, &ip6_use_deprecated, 0, 1673 CTL_NET, PF_INET6, IPPROTO_IPV6, 1674 IPV6CTL_USE_DEPRECATED, CTL_EOL); 1675 sysctl_createv(clog, 0, NULL, NULL, 1676 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1677 CTLTYPE_INT, "rr_prune", NULL, 1678 NULL, 0, &ip6_rr_prune, 0, 1679 CTL_NET, PF_INET6, IPPROTO_IPV6, 1680 IPV6CTL_RR_PRUNE, CTL_EOL); 1681 sysctl_createv(clog, 0, NULL, NULL, 1682 CTLFLAG_PERMANENT 1683 #ifndef INET6_BINDV6ONLY 1684 |CTLFLAG_READWRITE, 1685 #endif 1686 CTLTYPE_INT, "v6only", 1687 SYSCTL_DESCR("Disallow PF_INET6 sockets from connecting " 1688 "to PF_INET sockets"), 1689 NULL, 0, &ip6_v6only, 0, 1690 CTL_NET, PF_INET6, IPPROTO_IPV6, 1691 IPV6CTL_V6ONLY, CTL_EOL); 1692 sysctl_createv(clog, 0, NULL, NULL, 1693 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1694 CTLTYPE_INT, "anonportmin", 1695 SYSCTL_DESCR("Lowest ephemeral port number to assign"), 1696 sysctl_net_inet_ip_ports, 0, &ip6_anonportmin, 0, 1697 CTL_NET, PF_INET6, IPPROTO_IPV6, 1698 IPV6CTL_ANONPORTMIN, CTL_EOL); 1699 sysctl_createv(clog, 0, NULL, NULL, 1700 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1701 CTLTYPE_INT, "anonportmax", 1702 SYSCTL_DESCR("Highest ephemeral port number to assign"), 1703 sysctl_net_inet_ip_ports, 0, &ip6_anonportmax, 0, 1704 CTL_NET, PF_INET6, IPPROTO_IPV6, 1705 IPV6CTL_ANONPORTMAX, CTL_EOL); 1706 #ifndef IPNOPRIVPORTS 1707 sysctl_createv(clog, 0, NULL, NULL, 1708 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1709 CTLTYPE_INT, "lowportmin", 1710 SYSCTL_DESCR("Lowest privileged ephemeral port number " 1711 "to assign"), 1712 sysctl_net_inet_ip_ports, 0, &ip6_lowportmin, 0, 1713 CTL_NET, PF_INET6, IPPROTO_IPV6, 1714 IPV6CTL_LOWPORTMIN, CTL_EOL); 1715 sysctl_createv(clog, 0, NULL, NULL, 1716 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1717 CTLTYPE_INT, "lowportmax", 1718 SYSCTL_DESCR("Highest privileged ephemeral port number " 1719 "to assign"), 1720 sysctl_net_inet_ip_ports, 0, &ip6_lowportmax, 0, 1721 CTL_NET, PF_INET6, IPPROTO_IPV6, 1722 IPV6CTL_LOWPORTMAX, CTL_EOL); 1723 #endif /* IPNOPRIVPORTS */ 1724 sysctl_createv(clog, 0, NULL, NULL, 1725 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1726 CTLTYPE_INT, "auto_linklocal", 1727 SYSCTL_DESCR("Default value of per-interface flag for " 1728 "adding an IPv6 link-local address to " 1729 "interfaces when attached"), 1730 NULL, 0, &ip6_auto_linklocal, 0, 1731 CTL_NET, PF_INET6, IPPROTO_IPV6, 1732 IPV6CTL_AUTO_LINKLOCAL, CTL_EOL); 1733 sysctl_createv(clog, 0, NULL, NULL, 1734 CTLFLAG_PERMANENT|CTLFLAG_READONLY, 1735 CTLTYPE_STRUCT, "addctlpolicy", 1736 SYSCTL_DESCR("Return the current address control" 1737 " policy"), 1738 sysctl_net_inet6_addrctlpolicy, 0, NULL, 0, 1739 CTL_NET, PF_INET6, IPPROTO_IPV6, 1740 IPV6CTL_ADDRCTLPOLICY, CTL_EOL); 1741 sysctl_createv(clog, 0, NULL, NULL, 1742 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1743 CTLTYPE_INT, "use_tempaddr", 1744 SYSCTL_DESCR("Use temporary address"), 1745 NULL, 0, &ip6_use_tempaddr, 0, 1746 CTL_NET, PF_INET6, IPPROTO_IPV6, 1747 CTL_CREATE, CTL_EOL); 1748 sysctl_createv(clog, 0, NULL, NULL, 1749 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1750 CTLTYPE_INT, "prefer_tempaddr", 1751 SYSCTL_DESCR("Prefer temporary address as source " 1752 "address"), 1753 NULL, 0, &ip6_prefer_tempaddr, 0, 1754 CTL_NET, PF_INET6, IPPROTO_IPV6, 1755 CTL_CREATE, CTL_EOL); 1756 sysctl_createv(clog, 0, NULL, NULL, 1757 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1758 CTLTYPE_INT, "temppltime", 1759 SYSCTL_DESCR("preferred lifetime of a temporary address"), 1760 NULL, 0, &ip6_temp_preferred_lifetime, 0, 1761 CTL_NET, PF_INET6, IPPROTO_IPV6, 1762 CTL_CREATE, CTL_EOL); 1763 sysctl_createv(clog, 0, NULL, NULL, 1764 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1765 CTLTYPE_INT, "tempvltime", 1766 SYSCTL_DESCR("valid lifetime of a temporary address"), 1767 NULL, 0, &ip6_temp_valid_lifetime, 0, 1768 CTL_NET, PF_INET6, IPPROTO_IPV6, 1769 CTL_CREATE, CTL_EOL); 1770 sysctl_createv(clog, 0, NULL, NULL, 1771 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1772 CTLTYPE_INT, "maxfrags", 1773 SYSCTL_DESCR("Maximum fragments in reassembly queue"), 1774 NULL, 0, &ip6_maxfrags, 0, 1775 CTL_NET, PF_INET6, IPPROTO_IPV6, 1776 IPV6CTL_MAXFRAGS, CTL_EOL); 1777 sysctl_createv(clog, 0, NULL, NULL, 1778 CTLFLAG_PERMANENT, 1779 CTLTYPE_STRUCT, "stats", 1780 SYSCTL_DESCR("IPv6 statistics"), 1781 sysctl_net_inet6_ip6_stats, 0, NULL, 0, 1782 CTL_NET, PF_INET6, IPPROTO_IPV6, 1783 IPV6CTL_STATS, CTL_EOL); 1784 sysctl_createv(clog, 0, NULL, NULL, 1785 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1786 CTLTYPE_INT, "use_defaultzone", 1787 SYSCTL_DESCR("Whether to use the default scope zones"), 1788 NULL, 0, &ip6_use_defzone, 0, 1789 CTL_NET, PF_INET6, IPPROTO_IPV6, 1790 IPV6CTL_USE_DEFAULTZONE, CTL_EOL); 1791 sysctl_createv(clog, 0, NULL, NULL, 1792 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1793 CTLTYPE_INT, "mcast_pmtu", 1794 SYSCTL_DESCR("Enable pMTU discovery for multicast packet"), 1795 NULL, 0, &ip6_mcast_pmtu, 0, 1796 CTL_NET, PF_INET6, IPPROTO_IPV6, 1797 CTL_CREATE, CTL_EOL); 1798 /* anonportalgo RFC6056 subtree */ 1799 const struct sysctlnode *portalgo_node; 1800 sysctl_createv(clog, 0, NULL, &portalgo_node, 1801 CTLFLAG_PERMANENT, 1802 CTLTYPE_NODE, "anonportalgo", 1803 SYSCTL_DESCR("Anonymous port algorithm selection (RFC 6056)"), 1804 NULL, 0, NULL, 0, 1805 CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_CREATE, CTL_EOL); 1806 sysctl_createv(clog, 0, &portalgo_node, NULL, 1807 CTLFLAG_PERMANENT, 1808 CTLTYPE_STRING, "available", 1809 SYSCTL_DESCR("available algorithms"), 1810 sysctl_portalgo_available, 0, NULL, PORTALGO_MAXLEN, 1811 CTL_CREATE, CTL_EOL); 1812 sysctl_createv(clog, 0, &portalgo_node, NULL, 1813 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1814 CTLTYPE_STRING, "selected", 1815 SYSCTL_DESCR("selected algorithm"), 1816 sysctl_portalgo_selected6, 0, NULL, PORTALGO_MAXLEN, 1817 CTL_CREATE, CTL_EOL); 1818 sysctl_createv(clog, 0, &portalgo_node, NULL, 1819 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1820 CTLTYPE_STRUCT, "reserve", 1821 SYSCTL_DESCR("bitmap of reserved ports"), 1822 sysctl_portalgo_reserve6, 0, NULL, 0, 1823 CTL_CREATE, CTL_EOL); 1824 sysctl_createv(clog, 0, NULL, NULL, 1825 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1826 CTLTYPE_INT, "neighborgcthresh", 1827 SYSCTL_DESCR("Maximum number of entries in neighbor" 1828 " cache"), 1829 NULL, 1, &ip6_neighborgcthresh, 0, 1830 CTL_NET, PF_INET6, IPPROTO_IPV6, 1831 CTL_CREATE, CTL_EOL); 1832 sysctl_createv(clog, 0, NULL, NULL, 1833 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1834 CTLTYPE_INT, "maxifprefixes", 1835 SYSCTL_DESCR("Maximum number of prefixes created by" 1836 " route advertisement per interface"), 1837 NULL, 1, &ip6_maxifprefixes, 0, 1838 CTL_NET, PF_INET6, IPPROTO_IPV6, 1839 CTL_CREATE, CTL_EOL); 1840 sysctl_createv(clog, 0, NULL, NULL, 1841 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1842 CTLTYPE_INT, "maxifdefrouters", 1843 SYSCTL_DESCR("Maximum number of default routers created" 1844 " by route advertisement per interface"), 1845 NULL, 1, &ip6_maxifdefrouters, 0, 1846 CTL_NET, PF_INET6, IPPROTO_IPV6, 1847 CTL_CREATE, CTL_EOL); 1848 sysctl_createv(clog, 0, NULL, NULL, 1849 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1850 CTLTYPE_INT, "maxdynroutes", 1851 SYSCTL_DESCR("Maximum number of routes created via" 1852 " redirect"), 1853 NULL, 1, &ip6_maxdynroutes, 0, 1854 CTL_NET, PF_INET6, IPPROTO_IPV6, 1855 CTL_CREATE, CTL_EOL); 1856 } 1857 1858 void 1859 ip6_statinc(u_int stat) 1860 { 1861 1862 KASSERT(stat < IP6_NSTATS); 1863 IP6_STATINC(stat); 1864 } 1865
Indexes created Wed Sep 24 15:09:51 GMT 2025