1 /* $NetBSD: ip6_input.c,v 1.208 2019/05/13 07:47:59 ozaki-r Exp $ */ 2 /* $KAME: ip6_input.c,v 1.188 2001/03/29 05:34:31 itojun Exp $ */ 3 4 /* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* 34 * Copyright (c) 1982, 1986, 1988, 1993 35 * The Regents of the University of California. All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. Neither the name of the University nor the names of its contributors 46 * may be used to endorse or promote products derived from this software 47 * without specific prior written permission. 48 * 49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 59 * SUCH DAMAGE. 60 * 61 * @(#)ip_input.c 8.2 (Berkeley) 1/4/94 62 */ 63 64 #include <sys/cdefs.h> 65 __KERNEL_RCSID(0, "$NetBSD: ip6_input.c,v 1.208 2019/05/13 07:47:59 ozaki-r Exp $"); 66 67 #ifdef _KERNEL_OPT 68 #include "opt_gateway.h" 69 #include "opt_inet.h" 70 #include "opt_inet6.h" 71 #include "opt_ipsec.h" 72 #include "opt_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_skip_pfil(m)) 346 #else 347 if (1) 348 #endif 349 { 350 struct in6_addr odst; 351 int error; 352 353 odst = ip6->ip6_dst; 354 error = pfil_run_hooks(inet6_pfil_hook, &m, rcvif, PFIL_IN); 355 if (error != 0 || m == NULL) { 356 IP6_STATINC(IP6_STAT_PFILDROP_IN); 357 return; 358 } 359 KASSERT(m->m_len >= sizeof(struct ip6_hdr)); 360 ip6 = mtod(m, struct ip6_hdr *); 361 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst); 362 } 363 364 IP6_STATINC(IP6_STAT_NXTHIST + ip6->ip6_nxt); 365 366 #ifdef ALTQ 367 if (altq_input != NULL) { 368 SOFTNET_LOCK(); 369 if ((*altq_input)(m, AF_INET6) == 0) { 370 SOFTNET_UNLOCK(); 371 /* packet is dropped by traffic conditioner */ 372 return; 373 } 374 SOFTNET_UNLOCK(); 375 } 376 #endif 377 378 /* 379 * Disambiguate address scope zones (if there is ambiguity). 380 * We first make sure that the original source or destination address 381 * is not in our internal form for scoped addresses. Such addresses 382 * are not necessarily invalid spec-wise, but we cannot accept them due 383 * to the usage conflict. 384 * in6_setscope() then also checks and rejects the cases where src or 385 * dst are the loopback address and the receiving interface 386 * is not loopback. 387 */ 388 if (__predict_false( 389 m_makewritable(&m, 0, sizeof(struct ip6_hdr), M_DONTWAIT))) 390 goto bad; 391 ip6 = mtod(m, struct ip6_hdr *); 392 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) { 393 IP6_STATINC(IP6_STAT_BADSCOPE); /* XXX */ 394 goto bad; 395 } 396 if (in6_setscope(&ip6->ip6_src, rcvif, NULL) || 397 in6_setscope(&ip6->ip6_dst, rcvif, NULL)) { 398 IP6_STATINC(IP6_STAT_BADSCOPE); 399 goto bad; 400 } 401 402 ro = percpu_getref(ip6_forward_rt_percpu); 403 404 /* 405 * Multicast check 406 */ 407 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 408 bool ingroup; 409 410 in6_ifstat_inc(rcvif, ifs6_in_mcast); 411 /* 412 * See if we belong to the destination multicast group on the 413 * arrival interface. 414 */ 415 ingroup = in6_multi_group(&ip6->ip6_dst, rcvif); 416 if (ingroup) { 417 ours = 1; 418 } else if (!ip6_mrouter) { 419 uint64_t *ip6s = IP6_STAT_GETREF(); 420 ip6s[IP6_STAT_NOTMEMBER]++; 421 ip6s[IP6_STAT_CANTFORWARD]++; 422 IP6_STAT_PUTREF(); 423 in6_ifstat_inc(rcvif, ifs6_in_discard); 424 goto bad_unref; 425 } 426 deliverifp = rcvif; 427 goto hbhcheck; 428 } 429 430 sockaddr_in6_init(&u.dst6, &ip6->ip6_dst, 0, 0, 0); 431 432 /* 433 * Unicast check 434 */ 435 rt = rtcache_lookup2(ro, &u.dst, 1, &hit); 436 if (hit) 437 IP6_STATINC(IP6_STAT_FORWARD_CACHEHIT); 438 else 439 IP6_STATINC(IP6_STAT_FORWARD_CACHEMISS); 440 441 /* 442 * Accept the packet if the forwarding interface to the destination 443 * (according to the routing table) is the loopback interface, 444 * unless the associated route has a gateway. 445 * 446 * We don't explicitly match ip6_dst against an interface here. It 447 * is already done in rtcache_lookup2: rt->rt_ifp->if_type will be 448 * IFT_LOOP if the packet is for us. 449 * 450 * Note that this approach causes to accept a packet if there is a 451 * route to the loopback interface for the destination of the packet. 452 * But we think it's even useful in some situations, e.g. when using 453 * a special daemon which wants to intercept the packet. 454 */ 455 if (rt != NULL && 456 (rt->rt_flags & (RTF_HOST|RTF_GATEWAY)) == RTF_HOST && 457 rt->rt_ifp->if_type == IFT_LOOP) { 458 struct in6_ifaddr *ia6 = (struct in6_ifaddr *)rt->rt_ifa; 459 int addrok; 460 461 if (ia6->ia6_flags & IN6_IFF_ANYCAST) 462 m->m_flags |= M_ANYCAST6; 463 /* 464 * packets to a tentative, duplicated, or somehow invalid 465 * address must not be accepted. 466 */ 467 if (ia6->ia6_flags & IN6_IFF_NOTREADY) 468 addrok = 0; 469 else if (ia6->ia6_flags & IN6_IFF_DETACHED && 470 !IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) 471 { 472 /* Allow internal traffic to DETACHED addresses */ 473 struct sockaddr_in6 sin6; 474 int s; 475 476 memset(&sin6, 0, sizeof(sin6)); 477 sin6.sin6_family = AF_INET6; 478 sin6.sin6_len = sizeof(sin6); 479 sin6.sin6_addr = ip6->ip6_src; 480 s = pserialize_read_enter(); 481 addrok = (ifa_ifwithaddr(sin6tosa(&sin6)) != NULL); 482 pserialize_read_exit(s); 483 } else 484 addrok = 1; 485 if (addrok) { 486 /* this address is ready */ 487 ours = 1; 488 deliverifp = ia6->ia_ifp; /* correct? */ 489 goto hbhcheck; 490 } else { 491 /* address is not ready, so discard the packet. */ 492 char ip6bufs[INET6_ADDRSTRLEN]; 493 char ip6bufd[INET6_ADDRSTRLEN]; 494 nd6log(LOG_INFO, "packet to an unready address %s->%s\n", 495 IN6_PRINT(ip6bufs, &ip6->ip6_src), 496 IN6_PRINT(ip6bufd, &ip6->ip6_dst)); 497 498 goto bad_unref; 499 } 500 } 501 502 /* 503 * FAITH (Firewall Aided Internet Translator) 504 */ 505 #if defined(NFAITH) && 0 < NFAITH 506 if (ip6_keepfaith) { 507 if (rt != NULL && rt->rt_ifp != NULL && 508 rt->rt_ifp->if_type == IFT_FAITH) { 509 /* XXX do we need more sanity checks? */ 510 ours = 1; 511 deliverifp = rt->rt_ifp; /* faith */ 512 goto hbhcheck; 513 } 514 } 515 #endif 516 517 /* 518 * Now there is no reason to process the packet if it's not our own 519 * and we're not a router. 520 */ 521 if (!ip6_forwarding) { 522 IP6_STATINC(IP6_STAT_CANTFORWARD); 523 in6_ifstat_inc(rcvif, ifs6_in_discard); 524 goto bad_unref; 525 } 526 527 hbhcheck: 528 /* 529 * Record address information into m_tag, if we don't have one yet. 530 * Note that we are unable to record it, if the address is not listed 531 * as our interface address (e.g. multicast addresses, addresses 532 * within FAITH prefixes and such). 533 */ 534 if (deliverifp && ip6_getdstifaddr(m) == NULL) { 535 struct in6_ifaddr *ia6; 536 int s = pserialize_read_enter(); 537 538 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 539 /* Depends on ip6_setdstifaddr never sleep */ 540 if (ia6 != NULL && ip6_setdstifaddr(m, ia6) == NULL) { 541 /* 542 * XXX maybe we should drop the packet here, 543 * as we could not provide enough information 544 * to the upper layers. 545 */ 546 } 547 pserialize_read_exit(s); 548 } 549 550 /* 551 * Process Hop-by-Hop options header if it's contained. 552 * m may be modified in ip6_hopopts_input(). 553 * If a JumboPayload option is included, plen will also be modified. 554 */ 555 plen = (u_int32_t)ntohs(ip6->ip6_plen); 556 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 557 struct ip6_hbh *hbh; 558 559 if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) { 560 /* m already freed */ 561 in6_ifstat_inc(rcvif, ifs6_in_discard); 562 rtcache_unref(rt, ro); 563 percpu_putref(ip6_forward_rt_percpu); 564 return; 565 } 566 567 /* adjust pointer */ 568 ip6 = mtod(m, struct ip6_hdr *); 569 570 /* 571 * if the payload length field is 0 and the next header field 572 * indicates Hop-by-Hop Options header, then a Jumbo Payload 573 * option MUST be included. 574 */ 575 if (ip6->ip6_plen == 0 && plen == 0) { 576 /* 577 * Note that if a valid jumbo payload option is 578 * contained, ip6_hopopts_input() must set a valid 579 * (non-zero) payload length to the variable plen. 580 */ 581 IP6_STATINC(IP6_STAT_BADOPTIONS); 582 in6_ifstat_inc(rcvif, ifs6_in_discard); 583 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 584 icmp6_error(m, ICMP6_PARAM_PROB, 585 ICMP6_PARAMPROB_HEADER, 586 (char *)&ip6->ip6_plen - (char *)ip6); 587 rtcache_unref(rt, ro); 588 percpu_putref(ip6_forward_rt_percpu); 589 return; 590 } 591 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 592 sizeof(struct ip6_hbh)); 593 if (hbh == NULL) { 594 IP6_STATINC(IP6_STAT_TOOSHORT); 595 rtcache_unref(rt, ro); 596 percpu_putref(ip6_forward_rt_percpu); 597 return; 598 } 599 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 600 nxt = hbh->ip6h_nxt; 601 602 /* 603 * accept the packet if a router alert option is included 604 * and we act as an IPv6 router. 605 */ 606 if (rtalert != ~0 && ip6_forwarding) 607 ours = 1; 608 } else 609 nxt = ip6->ip6_nxt; 610 611 /* 612 * Check that the amount of data in the buffers is at least much as 613 * the IPv6 header would have us expect. Trim mbufs if longer than we 614 * expect. Drop packet if shorter than we expect. 615 */ 616 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 617 IP6_STATINC(IP6_STAT_TOOSHORT); 618 in6_ifstat_inc(rcvif, ifs6_in_truncated); 619 goto bad_unref; 620 } 621 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 622 if (m->m_len == m->m_pkthdr.len) { 623 m->m_len = sizeof(struct ip6_hdr) + plen; 624 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 625 } else 626 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 627 } 628 629 /* 630 * Forward if desirable. 631 */ 632 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 633 /* 634 * If we are acting as a multicast router, all 635 * incoming multicast packets are passed to the 636 * kernel-level multicast forwarding function. 637 * The packet is returned (relatively) intact; if 638 * ip6_mforward() returns a non-zero value, the packet 639 * must be discarded, else it may be accepted below. 640 */ 641 if (ip6_mrouter != NULL) { 642 int error; 643 644 SOFTNET_LOCK(); 645 error = ip6_mforward(ip6, rcvif, m); 646 SOFTNET_UNLOCK(); 647 648 if (error != 0) { 649 rtcache_unref(rt, ro); 650 percpu_putref(ip6_forward_rt_percpu); 651 IP6_STATINC(IP6_STAT_CANTFORWARD); 652 goto bad; 653 } 654 } 655 if (!ours) 656 goto bad_unref; 657 } else if (!ours) { 658 rtcache_unref(rt, ro); 659 percpu_putref(ip6_forward_rt_percpu); 660 ip6_forward(m, srcrt); 661 return; 662 } 663 664 ip6 = mtod(m, struct ip6_hdr *); 665 666 /* 667 * Malicious party may be able to use IPv4 mapped addr to confuse 668 * tcp/udp stack and bypass security checks (act as if it was from 669 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious. 670 * 671 * For SIIT end node behavior, you may want to disable the check. 672 * However, you will become vulnerable to attacks using IPv4 mapped 673 * source. 674 */ 675 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 676 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 677 IP6_STATINC(IP6_STAT_BADSCOPE); 678 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 679 goto bad_unref; 680 } 681 682 #ifdef IFA_STATS 683 if (deliverifp != NULL) { 684 struct in6_ifaddr *ia6; 685 int s = pserialize_read_enter(); 686 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 687 if (ia6) 688 ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len; 689 pserialize_read_exit(s); 690 } 691 #endif 692 IP6_STATINC(IP6_STAT_DELIVERED); 693 in6_ifstat_inc(deliverifp, ifs6_in_deliver); 694 nest = 0; 695 696 if (rt != NULL) { 697 rtcache_unref(rt, ro); 698 rt = NULL; 699 } 700 percpu_putref(ip6_forward_rt_percpu); 701 702 rh_present = 0; 703 frg_present = 0; 704 while (nxt != IPPROTO_DONE) { 705 if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) { 706 IP6_STATINC(IP6_STAT_TOOMANYHDR); 707 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 708 goto bad; 709 } 710 711 M_VERIFY_PACKET(m); 712 713 /* 714 * protection against faulty packet - there should be 715 * more sanity checks in header chain processing. 716 */ 717 if (m->m_pkthdr.len < off) { 718 IP6_STATINC(IP6_STAT_TOOSHORT); 719 in6_ifstat_inc(rcvif, ifs6_in_truncated); 720 goto bad; 721 } 722 723 if (nxt == IPPROTO_ROUTING) { 724 if (rh_present++) { 725 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 726 IP6_STATINC(IP6_STAT_BADOPTIONS); 727 goto bad; 728 } 729 } else if (nxt == IPPROTO_FRAGMENT) { 730 if (frg_present++) { 731 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 732 IP6_STATINC(IP6_STAT_BADOPTIONS); 733 goto bad; 734 } 735 } 736 737 #ifdef IPSEC 738 if (ipsec_used) { 739 /* 740 * Enforce IPsec policy checking if we are seeing last 741 * header. Note that we do not visit this with 742 * protocols with pcb layer code - like udp/tcp/raw ip. 743 */ 744 if ((inet6sw[ip6_protox[nxt]].pr_flags 745 & PR_LASTHDR) != 0) { 746 int error; 747 748 error = ipsec_ip_input(m, false); 749 if (error) 750 goto bad; 751 } 752 } 753 #endif 754 755 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt); 756 } 757 return; 758 759 bad_unref: 760 rtcache_unref(rt, ro); 761 percpu_putref(ip6_forward_rt_percpu); 762 bad: 763 m_freem(m); 764 return; 765 } 766 767 static bool 768 ip6_badaddr(struct ip6_hdr *ip6) 769 { 770 /* Check against address spoofing/corruption. */ 771 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) || 772 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) { 773 return true; 774 } 775 776 /* 777 * The following check is not documented in specs. A malicious 778 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack 779 * and bypass security checks (act as if it was from 127.0.0.1 by using 780 * IPv6 src ::ffff:127.0.0.1). Be cautious. 781 * 782 * This check chokes if we are in an SIIT cloud. As none of BSDs 783 * support IPv4-less kernel compilation, we cannot support SIIT 784 * environment at all. So, it makes more sense for us to reject any 785 * malicious packets for non-SIIT environment, than try to do a 786 * partial support for SIIT environment. 787 */ 788 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 789 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 790 return true; 791 } 792 793 /* 794 * Reject packets with IPv4-compatible IPv6 addresses (RFC4291). 795 */ 796 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) || 797 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) { 798 return true; 799 } 800 801 return false; 802 } 803 804 /* 805 * set/grab in6_ifaddr correspond to IPv6 destination address. 806 */ 807 static struct m_tag * 808 ip6_setdstifaddr(struct mbuf *m, const struct in6_ifaddr *ia) 809 { 810 struct m_tag *mtag; 811 struct ip6aux *ip6a; 812 813 mtag = ip6_addaux(m); 814 if (mtag == NULL) 815 return NULL; 816 817 ip6a = (struct ip6aux *)(mtag + 1); 818 if (in6_setscope(&ip6a->ip6a_src, ia->ia_ifp, &ip6a->ip6a_scope_id)) { 819 IP6_STATINC(IP6_STAT_BADSCOPE); 820 return NULL; 821 } 822 823 ip6a->ip6a_src = ia->ia_addr.sin6_addr; 824 ip6a->ip6a_flags = ia->ia6_flags; 825 return mtag; 826 } 827 828 const struct ip6aux * 829 ip6_getdstifaddr(struct mbuf *m) 830 { 831 struct m_tag *mtag; 832 833 mtag = ip6_findaux(m); 834 if (mtag != NULL) 835 return (struct ip6aux *)(mtag + 1); 836 else 837 return NULL; 838 } 839 840 /* 841 * Hop-by-Hop options header processing. If a valid jumbo payload option is 842 * included, the real payload length will be stored in plenp. 843 * 844 * rtalertp - XXX: should be stored more smart way 845 */ 846 int 847 ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp, 848 struct mbuf **mp, int *offp) 849 { 850 struct mbuf *m = *mp; 851 int off = *offp, hbhlen; 852 struct ip6_hbh *hbh; 853 854 /* validation of the length of the header */ 855 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, 856 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh)); 857 if (hbh == NULL) { 858 IP6_STATINC(IP6_STAT_TOOSHORT); 859 return -1; 860 } 861 hbhlen = (hbh->ip6h_len + 1) << 3; 862 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 863 hbhlen); 864 if (hbh == NULL) { 865 IP6_STATINC(IP6_STAT_TOOSHORT); 866 return -1; 867 } 868 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 869 off += hbhlen; 870 hbhlen -= sizeof(struct ip6_hbh); 871 872 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 873 hbhlen, rtalertp, plenp) < 0) 874 return -1; 875 876 *offp = off; 877 *mp = m; 878 return 0; 879 } 880 881 /* 882 * Search header for all Hop-by-hop options and process each option. 883 * This function is separate from ip6_hopopts_input() in order to 884 * handle a case where the sending node itself process its hop-by-hop 885 * options header. In such a case, the function is called from ip6_output(). 886 * 887 * The function assumes that hbh header is located right after the IPv6 header 888 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to 889 * opthead + hbhlen is located in continuous memory region. 890 */ 891 static int 892 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen, 893 u_int32_t *rtalertp, u_int32_t *plenp) 894 { 895 struct ip6_hdr *ip6; 896 int optlen = 0; 897 u_int8_t *opt = opthead; 898 u_int16_t rtalert_val; 899 u_int32_t jumboplen; 900 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh); 901 902 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 903 switch (*opt) { 904 case IP6OPT_PAD1: 905 optlen = 1; 906 break; 907 case IP6OPT_PADN: 908 if (hbhlen < IP6OPT_MINLEN) { 909 IP6_STATINC(IP6_STAT_TOOSMALL); 910 goto bad; 911 } 912 optlen = *(opt + 1) + 2; 913 break; 914 case IP6OPT_RTALERT: 915 /* XXX may need check for alignment */ 916 if (hbhlen < IP6OPT_RTALERT_LEN) { 917 IP6_STATINC(IP6_STAT_TOOSMALL); 918 goto bad; 919 } 920 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) { 921 /* XXX stat */ 922 icmp6_error(m, ICMP6_PARAM_PROB, 923 ICMP6_PARAMPROB_HEADER, 924 erroff + opt + 1 - opthead); 925 return (-1); 926 } 927 optlen = IP6OPT_RTALERT_LEN; 928 memcpy((void *)&rtalert_val, (void *)(opt + 2), 2); 929 *rtalertp = ntohs(rtalert_val); 930 break; 931 case IP6OPT_JUMBO: 932 /* XXX may need check for alignment */ 933 if (hbhlen < IP6OPT_JUMBO_LEN) { 934 IP6_STATINC(IP6_STAT_TOOSMALL); 935 goto bad; 936 } 937 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) { 938 /* XXX stat */ 939 icmp6_error(m, ICMP6_PARAM_PROB, 940 ICMP6_PARAMPROB_HEADER, 941 erroff + opt + 1 - opthead); 942 return (-1); 943 } 944 optlen = IP6OPT_JUMBO_LEN; 945 946 /* 947 * IPv6 packets that have non 0 payload length 948 * must not contain a jumbo payload option. 949 */ 950 ip6 = mtod(m, struct ip6_hdr *); 951 if (ip6->ip6_plen) { 952 IP6_STATINC(IP6_STAT_BADOPTIONS); 953 icmp6_error(m, ICMP6_PARAM_PROB, 954 ICMP6_PARAMPROB_HEADER, 955 erroff + opt - opthead); 956 return (-1); 957 } 958 959 /* 960 * We may see jumbolen in unaligned location, so 961 * we'd need to perform memcpy(). 962 */ 963 memcpy(&jumboplen, opt + 2, sizeof(jumboplen)); 964 jumboplen = (u_int32_t)htonl(jumboplen); 965 966 #if 1 967 /* 968 * if there are multiple jumbo payload options, 969 * *plenp will be non-zero and the packet will be 970 * rejected. 971 * the behavior may need some debate in ipngwg - 972 * multiple options does not make sense, however, 973 * there's no explicit mention in specification. 974 */ 975 if (*plenp != 0) { 976 IP6_STATINC(IP6_STAT_BADOPTIONS); 977 icmp6_error(m, ICMP6_PARAM_PROB, 978 ICMP6_PARAMPROB_HEADER, 979 erroff + opt + 2 - opthead); 980 return (-1); 981 } 982 #endif 983 984 /* 985 * jumbo payload length must be larger than 65535. 986 */ 987 if (jumboplen <= IPV6_MAXPACKET) { 988 IP6_STATINC(IP6_STAT_BADOPTIONS); 989 icmp6_error(m, ICMP6_PARAM_PROB, 990 ICMP6_PARAMPROB_HEADER, 991 erroff + opt + 2 - opthead); 992 return (-1); 993 } 994 *plenp = jumboplen; 995 996 break; 997 default: /* unknown option */ 998 if (hbhlen < IP6OPT_MINLEN) { 999 IP6_STATINC(IP6_STAT_TOOSMALL); 1000 goto bad; 1001 } 1002 optlen = ip6_unknown_opt(opt, m, 1003 erroff + opt - opthead); 1004 if (optlen == -1) 1005 return (-1); 1006 optlen += 2; 1007 break; 1008 } 1009 } 1010 1011 return (0); 1012 1013 bad: 1014 m_freem(m); 1015 return (-1); 1016 } 1017 1018 /* 1019 * Unknown option processing. 1020 * The third argument `off' is the offset from the IPv6 header to the option, 1021 * which is necessary if the IPv6 header the and option header and IPv6 header 1022 * is not continuous in order to return an ICMPv6 error. 1023 */ 1024 int 1025 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off) 1026 { 1027 struct ip6_hdr *ip6; 1028 1029 switch (IP6OPT_TYPE(*optp)) { 1030 case IP6OPT_TYPE_SKIP: /* ignore the option */ 1031 return ((int)*(optp + 1)); 1032 case IP6OPT_TYPE_DISCARD: /* silently discard */ 1033 m_freem(m); 1034 return (-1); 1035 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 1036 IP6_STATINC(IP6_STAT_BADOPTIONS); 1037 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 1038 return (-1); 1039 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 1040 IP6_STATINC(IP6_STAT_BADOPTIONS); 1041 ip6 = mtod(m, struct ip6_hdr *); 1042 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 1043 (m->m_flags & (M_BCAST|M_MCAST))) 1044 m_freem(m); 1045 else 1046 icmp6_error(m, ICMP6_PARAM_PROB, 1047 ICMP6_PARAMPROB_OPTION, off); 1048 return (-1); 1049 } 1050 1051 m_freem(m); /* XXX: NOTREACHED */ 1052 return (-1); 1053 } 1054 1055 void 1056 ip6_savecontrol(struct in6pcb *in6p, struct mbuf **mp, 1057 struct ip6_hdr *ip6, struct mbuf *m) 1058 { 1059 struct socket *so = in6p->in6p_socket; 1060 #ifdef RFC2292 1061 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y)) 1062 #else 1063 #define IS2292(x, y) (y) 1064 #endif 1065 1066 if (SOOPT_TIMESTAMP(so->so_options)) 1067 mp = sbsavetimestamp(so->so_options, mp); 1068 1069 /* some OSes call this logic with IPv4 packet, for SO_TIMESTAMP */ 1070 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) 1071 return; 1072 1073 /* RFC 2292 sec. 5 */ 1074 if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) { 1075 struct in6_pktinfo pi6; 1076 1077 memcpy(&pi6.ipi6_addr, &ip6->ip6_dst, sizeof(struct in6_addr)); 1078 in6_clearscope(&pi6.ipi6_addr); /* XXX */ 1079 pi6.ipi6_ifindex = m->m_pkthdr.rcvif_index; 1080 *mp = sbcreatecontrol(&pi6, sizeof(pi6), 1081 IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6); 1082 if (*mp) 1083 mp = &(*mp)->m_next; 1084 } 1085 1086 if (in6p->in6p_flags & IN6P_HOPLIMIT) { 1087 int hlim = ip6->ip6_hlim & 0xff; 1088 1089 *mp = sbcreatecontrol(&hlim, sizeof(hlim), 1090 IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6); 1091 if (*mp) 1092 mp = &(*mp)->m_next; 1093 } 1094 1095 if ((in6p->in6p_flags & IN6P_TCLASS) != 0) { 1096 u_int32_t flowinfo; 1097 int tclass; 1098 1099 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK); 1100 flowinfo >>= 20; 1101 1102 tclass = flowinfo & 0xff; 1103 *mp = sbcreatecontrol(&tclass, sizeof(tclass), 1104 IPV6_TCLASS, IPPROTO_IPV6); 1105 1106 if (*mp) 1107 mp = &(*mp)->m_next; 1108 } 1109 1110 /* 1111 * IPV6_HOPOPTS socket option. Recall that we required super-user 1112 * privilege for the option (see ip6_ctloutput), but it might be too 1113 * strict, since there might be some hop-by-hop options which can be 1114 * returned to normal user. 1115 * See also RFC3542 section 8 (or RFC2292 section 6). 1116 */ 1117 if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0) { 1118 /* 1119 * Check if a hop-by-hop options header is contatined in the 1120 * received packet, and if so, store the options as ancillary 1121 * data. Note that a hop-by-hop options header must be 1122 * just after the IPv6 header, which fact is assured through 1123 * the IPv6 input processing. 1124 */ 1125 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1126 if (xip6->ip6_nxt == IPPROTO_HOPOPTS) { 1127 struct ip6_hbh *hbh; 1128 int hbhlen; 1129 struct mbuf *ext; 1130 1131 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr), 1132 xip6->ip6_nxt); 1133 if (ext == NULL) { 1134 IP6_STATINC(IP6_STAT_TOOSHORT); 1135 return; 1136 } 1137 hbh = mtod(ext, struct ip6_hbh *); 1138 hbhlen = (hbh->ip6h_len + 1) << 3; 1139 if (hbhlen != ext->m_len) { 1140 m_freem(ext); 1141 IP6_STATINC(IP6_STAT_TOOSHORT); 1142 return; 1143 } 1144 1145 /* 1146 * XXX: We copy whole the header even if a jumbo 1147 * payload option is included, which option is to 1148 * be removed before returning in the RFC 2292. 1149 * Note: this constraint is removed in RFC3542. 1150 */ 1151 *mp = sbcreatecontrol(hbh, hbhlen, 1152 IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS), 1153 IPPROTO_IPV6); 1154 if (*mp) 1155 mp = &(*mp)->m_next; 1156 m_freem(ext); 1157 } 1158 } 1159 1160 /* IPV6_DSTOPTS and IPV6_RTHDR socket options */ 1161 if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) { 1162 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1163 int nxt = xip6->ip6_nxt, off = sizeof(struct ip6_hdr); 1164 1165 /* 1166 * Search for destination options headers or routing 1167 * header(s) through the header chain, and stores each 1168 * header as ancillary data. 1169 * Note that the order of the headers remains in 1170 * the chain of ancillary data. 1171 */ 1172 for (;;) { /* is explicit loop prevention necessary? */ 1173 struct ip6_ext *ip6e = NULL; 1174 int elen; 1175 struct mbuf *ext = NULL; 1176 1177 /* 1178 * if it is not an extension header, don't try to 1179 * pull it from the chain. 1180 */ 1181 switch (nxt) { 1182 case IPPROTO_DSTOPTS: 1183 case IPPROTO_ROUTING: 1184 case IPPROTO_HOPOPTS: 1185 case IPPROTO_AH: /* is it possible? */ 1186 break; 1187 default: 1188 goto loopend; 1189 } 1190 1191 ext = ip6_pullexthdr(m, off, nxt); 1192 if (ext == NULL) { 1193 IP6_STATINC(IP6_STAT_TOOSHORT); 1194 return; 1195 } 1196 ip6e = mtod(ext, struct ip6_ext *); 1197 if (nxt == IPPROTO_AH) 1198 elen = (ip6e->ip6e_len + 2) << 2; 1199 else 1200 elen = (ip6e->ip6e_len + 1) << 3; 1201 if (elen != ext->m_len) { 1202 m_freem(ext); 1203 IP6_STATINC(IP6_STAT_TOOSHORT); 1204 return; 1205 } 1206 KASSERT(IP6_HDR_ALIGNED_P(ip6e)); 1207 1208 switch (nxt) { 1209 case IPPROTO_DSTOPTS: 1210 if (!(in6p->in6p_flags & IN6P_DSTOPTS)) 1211 break; 1212 1213 *mp = sbcreatecontrol(ip6e, elen, 1214 IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS), 1215 IPPROTO_IPV6); 1216 if (*mp) 1217 mp = &(*mp)->m_next; 1218 break; 1219 1220 case IPPROTO_ROUTING: 1221 if (!(in6p->in6p_flags & IN6P_RTHDR)) 1222 break; 1223 1224 *mp = sbcreatecontrol(ip6e, elen, 1225 IS2292(IPV6_2292RTHDR, IPV6_RTHDR), 1226 IPPROTO_IPV6); 1227 if (*mp) 1228 mp = &(*mp)->m_next; 1229 break; 1230 1231 case IPPROTO_HOPOPTS: 1232 case IPPROTO_AH: /* is it possible? */ 1233 break; 1234 1235 default: 1236 /* 1237 * other cases have been filtered in the above. 1238 * none will visit this case. here we supply 1239 * the code just in case (nxt overwritten or 1240 * other cases). 1241 */ 1242 m_freem(ext); 1243 goto loopend; 1244 1245 } 1246 1247 /* proceed with the next header. */ 1248 off += elen; 1249 nxt = ip6e->ip6e_nxt; 1250 ip6e = NULL; 1251 m_freem(ext); 1252 ext = NULL; 1253 } 1254 loopend: 1255 ; 1256 } 1257 } 1258 #undef IS2292 1259 1260 1261 void 1262 ip6_notify_pmtu(struct in6pcb *in6p, const struct sockaddr_in6 *dst, 1263 uint32_t *mtu) 1264 { 1265 struct socket *so; 1266 struct mbuf *m_mtu; 1267 struct ip6_mtuinfo mtuctl; 1268 1269 so = in6p->in6p_socket; 1270 1271 if (mtu == NULL) 1272 return; 1273 1274 KASSERT(so != NULL); 1275 1276 memset(&mtuctl, 0, sizeof(mtuctl)); /* zero-clear for safety */ 1277 mtuctl.ip6m_mtu = *mtu; 1278 mtuctl.ip6m_addr = *dst; 1279 if (sa6_recoverscope(&mtuctl.ip6m_addr)) 1280 return; 1281 1282 if ((m_mtu = sbcreatecontrol(&mtuctl, sizeof(mtuctl), 1283 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL) 1284 return; 1285 1286 if (sbappendaddr(&so->so_rcv, (const struct sockaddr *)dst, NULL, m_mtu) 1287 == 0) { 1288 soroverflow(so); 1289 m_freem(m_mtu); 1290 } else 1291 sorwakeup(so); 1292 1293 return; 1294 } 1295 1296 /* 1297 * pull single extension header from mbuf chain. returns single mbuf that 1298 * contains the result, or NULL on error. 1299 */ 1300 static struct mbuf * 1301 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt) 1302 { 1303 struct ip6_ext ip6e; 1304 size_t elen; 1305 struct mbuf *n; 1306 1307 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1308 if (nxt == IPPROTO_AH) 1309 elen = (ip6e.ip6e_len + 2) << 2; 1310 else 1311 elen = (ip6e.ip6e_len + 1) << 3; 1312 1313 MGET(n, M_DONTWAIT, MT_DATA); 1314 if (n && elen >= MLEN) { 1315 MCLGET(n, M_DONTWAIT); 1316 if ((n->m_flags & M_EXT) == 0) { 1317 m_free(n); 1318 n = NULL; 1319 } 1320 } 1321 if (!n) 1322 return NULL; 1323 1324 n->m_len = 0; 1325 if (elen >= M_TRAILINGSPACE(n)) { 1326 m_free(n); 1327 return NULL; 1328 } 1329 1330 m_copydata(m, off, elen, mtod(n, void *)); 1331 n->m_len = elen; 1332 return n; 1333 } 1334 1335 /* 1336 * Get offset to the previous header followed by the header 1337 * currently processed. 1338 */ 1339 int 1340 ip6_get_prevhdr(struct mbuf *m, int off) 1341 { 1342 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1343 1344 if (off == sizeof(struct ip6_hdr)) { 1345 return offsetof(struct ip6_hdr, ip6_nxt); 1346 } else if (off < sizeof(struct ip6_hdr)) { 1347 panic("%s: off < sizeof(struct ip6_hdr)", __func__); 1348 } else { 1349 int len, nlen, nxt; 1350 struct ip6_ext ip6e; 1351 1352 nxt = ip6->ip6_nxt; 1353 len = sizeof(struct ip6_hdr); 1354 nlen = 0; 1355 while (len < off) { 1356 m_copydata(m, len, sizeof(ip6e), &ip6e); 1357 1358 switch (nxt) { 1359 case IPPROTO_FRAGMENT: 1360 nlen = sizeof(struct ip6_frag); 1361 break; 1362 case IPPROTO_AH: 1363 nlen = (ip6e.ip6e_len + 2) << 2; 1364 break; 1365 default: 1366 nlen = (ip6e.ip6e_len + 1) << 3; 1367 break; 1368 } 1369 len += nlen; 1370 nxt = ip6e.ip6e_nxt; 1371 } 1372 1373 return (len - nlen); 1374 } 1375 } 1376 1377 /* 1378 * get next header offset. m will be retained. 1379 */ 1380 int 1381 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp) 1382 { 1383 struct ip6_hdr ip6; 1384 struct ip6_ext ip6e; 1385 struct ip6_frag fh; 1386 1387 /* just in case */ 1388 if (m == NULL) 1389 panic("%s: m == NULL", __func__); 1390 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off) 1391 return -1; 1392 1393 switch (proto) { 1394 case IPPROTO_IPV6: 1395 /* do not chase beyond intermediate IPv6 headers */ 1396 if (off != 0) 1397 return -1; 1398 if (m->m_pkthdr.len < off + sizeof(ip6)) 1399 return -1; 1400 m_copydata(m, off, sizeof(ip6), (void *)&ip6); 1401 if (nxtp) 1402 *nxtp = ip6.ip6_nxt; 1403 off += sizeof(ip6); 1404 return off; 1405 1406 case IPPROTO_FRAGMENT: 1407 /* 1408 * terminate parsing if it is not the first fragment, 1409 * it does not make sense to parse through it. 1410 */ 1411 if (m->m_pkthdr.len < off + sizeof(fh)) 1412 return -1; 1413 m_copydata(m, off, sizeof(fh), (void *)&fh); 1414 if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0) 1415 return -1; 1416 if (nxtp) 1417 *nxtp = fh.ip6f_nxt; 1418 off += sizeof(struct ip6_frag); 1419 return off; 1420 1421 case IPPROTO_AH: 1422 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1423 return -1; 1424 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1425 if (nxtp) 1426 *nxtp = ip6e.ip6e_nxt; 1427 off += (ip6e.ip6e_len + 2) << 2; 1428 if (m->m_pkthdr.len < off) 1429 return -1; 1430 return off; 1431 1432 case IPPROTO_HOPOPTS: 1433 case IPPROTO_ROUTING: 1434 case IPPROTO_DSTOPTS: 1435 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1436 return -1; 1437 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1438 if (nxtp) 1439 *nxtp = ip6e.ip6e_nxt; 1440 off += (ip6e.ip6e_len + 1) << 3; 1441 if (m->m_pkthdr.len < off) 1442 return -1; 1443 return off; 1444 1445 case IPPROTO_NONE: 1446 case IPPROTO_ESP: 1447 case IPPROTO_IPCOMP: 1448 /* give up */ 1449 return -1; 1450 1451 default: 1452 return -1; 1453 } 1454 } 1455 1456 /* 1457 * get offset for the last header in the chain. m will be kept untainted. 1458 */ 1459 int 1460 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp) 1461 { 1462 int newoff; 1463 int nxt; 1464 1465 if (!nxtp) { 1466 nxt = -1; 1467 nxtp = &nxt; 1468 } 1469 for (;;) { 1470 newoff = ip6_nexthdr(m, off, proto, nxtp); 1471 if (newoff < 0) 1472 return off; 1473 else if (newoff < off) 1474 return -1; /* invalid */ 1475 else if (newoff == off) 1476 return newoff; 1477 1478 off = newoff; 1479 proto = *nxtp; 1480 } 1481 } 1482 1483 struct m_tag * 1484 ip6_addaux(struct mbuf *m) 1485 { 1486 struct m_tag *mtag; 1487 1488 mtag = m_tag_find(m, PACKET_TAG_INET6); 1489 if (!mtag) { 1490 mtag = m_tag_get(PACKET_TAG_INET6, sizeof(struct ip6aux), 1491 M_NOWAIT); 1492 if (mtag) { 1493 m_tag_prepend(m, mtag); 1494 memset(mtag + 1, 0, sizeof(struct ip6aux)); 1495 } 1496 } 1497 return mtag; 1498 } 1499 1500 struct m_tag * 1501 ip6_findaux(struct mbuf *m) 1502 { 1503 struct m_tag *mtag; 1504 1505 mtag = m_tag_find(m, PACKET_TAG_INET6); 1506 return mtag; 1507 } 1508 1509 void 1510 ip6_delaux(struct mbuf *m) 1511 { 1512 struct m_tag *mtag; 1513 1514 mtag = m_tag_find(m, PACKET_TAG_INET6); 1515 if (mtag) 1516 m_tag_delete(m, mtag); 1517 } 1518 1519 /* 1520 * System control for IP6 1521 */ 1522 1523 const u_char inet6ctlerrmap[PRC_NCMDS] = { 1524 0, 0, 0, 0, 1525 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 1526 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 1527 EMSGSIZE, EHOSTUNREACH, 0, 0, 1528 0, 0, 0, 0, 1529 ENOPROTOOPT 1530 }; 1531 1532 extern int sysctl_net_inet6_addrctlpolicy(SYSCTLFN_ARGS); 1533 1534 static int 1535 sysctl_net_inet6_ip6_stats(SYSCTLFN_ARGS) 1536 { 1537 1538 return (NETSTAT_SYSCTL(ip6stat_percpu, IP6_NSTATS)); 1539 } 1540 1541 static void 1542 sysctl_net_inet6_ip6_setup(struct sysctllog **clog) 1543 { 1544 1545 sysctl_createv(clog, 0, NULL, NULL, 1546 CTLFLAG_PERMANENT, 1547 CTLTYPE_NODE, "inet6", 1548 SYSCTL_DESCR("PF_INET6 related settings"), 1549 NULL, 0, NULL, 0, 1550 CTL_NET, PF_INET6, CTL_EOL); 1551 sysctl_createv(clog, 0, NULL, NULL, 1552 CTLFLAG_PERMANENT, 1553 CTLTYPE_NODE, "ip6", 1554 SYSCTL_DESCR("IPv6 related settings"), 1555 NULL, 0, NULL, 0, 1556 CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_EOL); 1557 1558 sysctl_createv(clog, 0, NULL, NULL, 1559 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1560 CTLTYPE_INT, "forwarding", 1561 SYSCTL_DESCR("Enable forwarding of INET6 datagrams"), 1562 NULL, 0, &ip6_forwarding, 0, 1563 CTL_NET, PF_INET6, IPPROTO_IPV6, 1564 IPV6CTL_FORWARDING, CTL_EOL); 1565 sysctl_createv(clog, 0, NULL, NULL, 1566 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1567 CTLTYPE_INT, "redirect", 1568 SYSCTL_DESCR("Enable sending of ICMPv6 redirect messages"), 1569 NULL, 0, &ip6_sendredirects, 0, 1570 CTL_NET, PF_INET6, IPPROTO_IPV6, 1571 IPV6CTL_SENDREDIRECTS, CTL_EOL); 1572 sysctl_createv(clog, 0, NULL, NULL, 1573 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1574 CTLTYPE_INT, "hlim", 1575 SYSCTL_DESCR("Hop limit for an INET6 datagram"), 1576 NULL, 0, &ip6_defhlim, 0, 1577 CTL_NET, PF_INET6, IPPROTO_IPV6, 1578 IPV6CTL_DEFHLIM, CTL_EOL); 1579 sysctl_createv(clog, 0, NULL, NULL, 1580 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1581 CTLTYPE_INT, "maxfragpackets", 1582 SYSCTL_DESCR("Maximum number of fragments to buffer " 1583 "for reassembly"), 1584 NULL, 0, &ip6_maxfragpackets, 0, 1585 CTL_NET, PF_INET6, IPPROTO_IPV6, 1586 IPV6CTL_MAXFRAGPACKETS, CTL_EOL); 1587 sysctl_createv(clog, 0, NULL, NULL, 1588 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1589 CTLTYPE_INT, "accept_rtadv", 1590 SYSCTL_DESCR("Accept router advertisements"), 1591 NULL, 0, &ip6_accept_rtadv, 0, 1592 CTL_NET, PF_INET6, IPPROTO_IPV6, 1593 IPV6CTL_ACCEPT_RTADV, CTL_EOL); 1594 sysctl_createv(clog, 0, NULL, NULL, 1595 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1596 CTLTYPE_INT, "rtadv_maxroutes", 1597 SYSCTL_DESCR("Maximum number of routes accepted via router advertisements"), 1598 NULL, 0, &ip6_rtadv_maxroutes, 0, 1599 CTL_NET, PF_INET6, IPPROTO_IPV6, 1600 IPV6CTL_RTADV_MAXROUTES, CTL_EOL); 1601 sysctl_createv(clog, 0, NULL, NULL, 1602 CTLFLAG_PERMANENT, 1603 CTLTYPE_INT, "rtadv_numroutes", 1604 SYSCTL_DESCR("Current number of routes accepted via router advertisements"), 1605 NULL, 0, &nd6_numroutes, 0, 1606 CTL_NET, PF_INET6, IPPROTO_IPV6, 1607 IPV6CTL_RTADV_NUMROUTES, CTL_EOL); 1608 sysctl_createv(clog, 0, NULL, NULL, 1609 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1610 CTLTYPE_INT, "keepfaith", 1611 SYSCTL_DESCR("Activate faith interface"), 1612 NULL, 0, &ip6_keepfaith, 0, 1613 CTL_NET, PF_INET6, IPPROTO_IPV6, 1614 IPV6CTL_KEEPFAITH, CTL_EOL); 1615 sysctl_createv(clog, 0, NULL, NULL, 1616 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1617 CTLTYPE_INT, "log_interval", 1618 SYSCTL_DESCR("Minimum interval between logging " 1619 "unroutable packets"), 1620 NULL, 0, &ip6_log_interval, 0, 1621 CTL_NET, PF_INET6, IPPROTO_IPV6, 1622 IPV6CTL_LOG_INTERVAL, CTL_EOL); 1623 sysctl_createv(clog, 0, NULL, NULL, 1624 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1625 CTLTYPE_INT, "hdrnestlimit", 1626 SYSCTL_DESCR("Maximum number of nested IPv6 headers"), 1627 NULL, 0, &ip6_hdrnestlimit, 0, 1628 CTL_NET, PF_INET6, IPPROTO_IPV6, 1629 IPV6CTL_HDRNESTLIMIT, CTL_EOL); 1630 sysctl_createv(clog, 0, NULL, NULL, 1631 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1632 CTLTYPE_INT, "dad_count", 1633 SYSCTL_DESCR("Number of Duplicate Address Detection " 1634 "probes to send"), 1635 NULL, 0, &ip6_dad_count, 0, 1636 CTL_NET, PF_INET6, IPPROTO_IPV6, 1637 IPV6CTL_DAD_COUNT, CTL_EOL); 1638 sysctl_createv(clog, 0, NULL, NULL, 1639 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1640 CTLTYPE_INT, "auto_flowlabel", 1641 SYSCTL_DESCR("Assign random IPv6 flow labels"), 1642 NULL, 0, &ip6_auto_flowlabel, 0, 1643 CTL_NET, PF_INET6, IPPROTO_IPV6, 1644 IPV6CTL_AUTO_FLOWLABEL, CTL_EOL); 1645 sysctl_createv(clog, 0, NULL, NULL, 1646 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1647 CTLTYPE_INT, "defmcasthlim", 1648 SYSCTL_DESCR("Default multicast hop limit"), 1649 NULL, 0, &ip6_defmcasthlim, 0, 1650 CTL_NET, PF_INET6, IPPROTO_IPV6, 1651 IPV6CTL_DEFMCASTHLIM, CTL_EOL); 1652 sysctl_createv(clog, 0, NULL, NULL, 1653 CTLFLAG_PERMANENT, 1654 CTLTYPE_STRING, "kame_version", 1655 SYSCTL_DESCR("KAME Version"), 1656 NULL, 0, __UNCONST(__KAME_VERSION), 0, 1657 CTL_NET, PF_INET6, IPPROTO_IPV6, 1658 IPV6CTL_KAME_VERSION, CTL_EOL); 1659 sysctl_createv(clog, 0, NULL, NULL, 1660 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1661 CTLTYPE_INT, "use_deprecated", 1662 SYSCTL_DESCR("Allow use of deprecated addresses as " 1663 "source addresses"), 1664 NULL, 0, &ip6_use_deprecated, 0, 1665 CTL_NET, PF_INET6, IPPROTO_IPV6, 1666 IPV6CTL_USE_DEPRECATED, CTL_EOL); 1667 sysctl_createv(clog, 0, NULL, NULL, 1668 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1669 CTLTYPE_INT, "rr_prune", NULL, 1670 NULL, 0, &ip6_rr_prune, 0, 1671 CTL_NET, PF_INET6, IPPROTO_IPV6, 1672 IPV6CTL_RR_PRUNE, CTL_EOL); 1673 sysctl_createv(clog, 0, NULL, NULL, 1674 CTLFLAG_PERMANENT 1675 #ifndef INET6_BINDV6ONLY 1676 |CTLFLAG_READWRITE, 1677 #endif 1678 CTLTYPE_INT, "v6only", 1679 SYSCTL_DESCR("Disallow PF_INET6 sockets from connecting " 1680 "to PF_INET sockets"), 1681 NULL, 0, &ip6_v6only, 0, 1682 CTL_NET, PF_INET6, IPPROTO_IPV6, 1683 IPV6CTL_V6ONLY, CTL_EOL); 1684 sysctl_createv(clog, 0, NULL, NULL, 1685 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1686 CTLTYPE_INT, "anonportmin", 1687 SYSCTL_DESCR("Lowest ephemeral port number to assign"), 1688 sysctl_net_inet_ip_ports, 0, &ip6_anonportmin, 0, 1689 CTL_NET, PF_INET6, IPPROTO_IPV6, 1690 IPV6CTL_ANONPORTMIN, CTL_EOL); 1691 sysctl_createv(clog, 0, NULL, NULL, 1692 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1693 CTLTYPE_INT, "anonportmax", 1694 SYSCTL_DESCR("Highest ephemeral port number to assign"), 1695 sysctl_net_inet_ip_ports, 0, &ip6_anonportmax, 0, 1696 CTL_NET, PF_INET6, IPPROTO_IPV6, 1697 IPV6CTL_ANONPORTMAX, CTL_EOL); 1698 #ifndef IPNOPRIVPORTS 1699 sysctl_createv(clog, 0, NULL, NULL, 1700 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1701 CTLTYPE_INT, "lowportmin", 1702 SYSCTL_DESCR("Lowest privileged ephemeral port number " 1703 "to assign"), 1704 sysctl_net_inet_ip_ports, 0, &ip6_lowportmin, 0, 1705 CTL_NET, PF_INET6, IPPROTO_IPV6, 1706 IPV6CTL_LOWPORTMIN, CTL_EOL); 1707 sysctl_createv(clog, 0, NULL, NULL, 1708 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1709 CTLTYPE_INT, "lowportmax", 1710 SYSCTL_DESCR("Highest privileged ephemeral port number " 1711 "to assign"), 1712 sysctl_net_inet_ip_ports, 0, &ip6_lowportmax, 0, 1713 CTL_NET, PF_INET6, IPPROTO_IPV6, 1714 IPV6CTL_LOWPORTMAX, CTL_EOL); 1715 #endif /* IPNOPRIVPORTS */ 1716 sysctl_createv(clog, 0, NULL, NULL, 1717 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1718 CTLTYPE_INT, "auto_linklocal", 1719 SYSCTL_DESCR("Default value of per-interface flag for " 1720 "adding an IPv6 link-local address to " 1721 "interfaces when attached"), 1722 NULL, 0, &ip6_auto_linklocal, 0, 1723 CTL_NET, PF_INET6, IPPROTO_IPV6, 1724 IPV6CTL_AUTO_LINKLOCAL, CTL_EOL); 1725 sysctl_createv(clog, 0, NULL, NULL, 1726 CTLFLAG_PERMANENT|CTLFLAG_READONLY, 1727 CTLTYPE_STRUCT, "addctlpolicy", 1728 SYSCTL_DESCR("Return the current address control" 1729 " policy"), 1730 sysctl_net_inet6_addrctlpolicy, 0, NULL, 0, 1731 CTL_NET, PF_INET6, IPPROTO_IPV6, 1732 IPV6CTL_ADDRCTLPOLICY, CTL_EOL); 1733 sysctl_createv(clog, 0, NULL, NULL, 1734 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1735 CTLTYPE_INT, "use_tempaddr", 1736 SYSCTL_DESCR("Use temporary address"), 1737 NULL, 0, &ip6_use_tempaddr, 0, 1738 CTL_NET, PF_INET6, IPPROTO_IPV6, 1739 CTL_CREATE, CTL_EOL); 1740 sysctl_createv(clog, 0, NULL, NULL, 1741 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1742 CTLTYPE_INT, "prefer_tempaddr", 1743 SYSCTL_DESCR("Prefer temporary address as source " 1744 "address"), 1745 NULL, 0, &ip6_prefer_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, "temppltime", 1751 SYSCTL_DESCR("preferred lifetime of a temporary address"), 1752 NULL, 0, &ip6_temp_preferred_lifetime, 0, 1753 CTL_NET, PF_INET6, IPPROTO_IPV6, 1754 CTL_CREATE, CTL_EOL); 1755 sysctl_createv(clog, 0, NULL, NULL, 1756 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1757 CTLTYPE_INT, "tempvltime", 1758 SYSCTL_DESCR("valid lifetime of a temporary address"), 1759 NULL, 0, &ip6_temp_valid_lifetime, 0, 1760 CTL_NET, PF_INET6, IPPROTO_IPV6, 1761 CTL_CREATE, CTL_EOL); 1762 sysctl_createv(clog, 0, NULL, NULL, 1763 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1764 CTLTYPE_INT, "maxfrags", 1765 SYSCTL_DESCR("Maximum fragments in reassembly queue"), 1766 NULL, 0, &ip6_maxfrags, 0, 1767 CTL_NET, PF_INET6, IPPROTO_IPV6, 1768 IPV6CTL_MAXFRAGS, CTL_EOL); 1769 sysctl_createv(clog, 0, NULL, NULL, 1770 CTLFLAG_PERMANENT, 1771 CTLTYPE_STRUCT, "stats", 1772 SYSCTL_DESCR("IPv6 statistics"), 1773 sysctl_net_inet6_ip6_stats, 0, NULL, 0, 1774 CTL_NET, PF_INET6, IPPROTO_IPV6, 1775 IPV6CTL_STATS, CTL_EOL); 1776 sysctl_createv(clog, 0, NULL, NULL, 1777 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1778 CTLTYPE_INT, "use_defaultzone", 1779 SYSCTL_DESCR("Whether to use the default scope zones"), 1780 NULL, 0, &ip6_use_defzone, 0, 1781 CTL_NET, PF_INET6, IPPROTO_IPV6, 1782 IPV6CTL_USE_DEFAULTZONE, CTL_EOL); 1783 sysctl_createv(clog, 0, NULL, NULL, 1784 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1785 CTLTYPE_INT, "mcast_pmtu", 1786 SYSCTL_DESCR("Enable pMTU discovery for multicast packet"), 1787 NULL, 0, &ip6_mcast_pmtu, 0, 1788 CTL_NET, PF_INET6, IPPROTO_IPV6, 1789 CTL_CREATE, CTL_EOL); 1790 /* anonportalgo RFC6056 subtree */ 1791 const struct sysctlnode *portalgo_node; 1792 sysctl_createv(clog, 0, NULL, &portalgo_node, 1793 CTLFLAG_PERMANENT, 1794 CTLTYPE_NODE, "anonportalgo", 1795 SYSCTL_DESCR("Anonymous port algorithm selection (RFC 6056)"), 1796 NULL, 0, NULL, 0, 1797 CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_CREATE, CTL_EOL); 1798 sysctl_createv(clog, 0, &portalgo_node, NULL, 1799 CTLFLAG_PERMANENT, 1800 CTLTYPE_STRING, "available", 1801 SYSCTL_DESCR("available algorithms"), 1802 sysctl_portalgo_available, 0, NULL, PORTALGO_MAXLEN, 1803 CTL_CREATE, CTL_EOL); 1804 sysctl_createv(clog, 0, &portalgo_node, NULL, 1805 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1806 CTLTYPE_STRING, "selected", 1807 SYSCTL_DESCR("selected algorithm"), 1808 sysctl_portalgo_selected6, 0, NULL, PORTALGO_MAXLEN, 1809 CTL_CREATE, CTL_EOL); 1810 sysctl_createv(clog, 0, &portalgo_node, NULL, 1811 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1812 CTLTYPE_STRUCT, "reserve", 1813 SYSCTL_DESCR("bitmap of reserved ports"), 1814 sysctl_portalgo_reserve6, 0, NULL, 0, 1815 CTL_CREATE, CTL_EOL); 1816 sysctl_createv(clog, 0, NULL, NULL, 1817 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1818 CTLTYPE_INT, "neighborgcthresh", 1819 SYSCTL_DESCR("Maximum number of entries in neighbor" 1820 " cache"), 1821 NULL, 1, &ip6_neighborgcthresh, 0, 1822 CTL_NET, PF_INET6, IPPROTO_IPV6, 1823 CTL_CREATE, CTL_EOL); 1824 sysctl_createv(clog, 0, NULL, NULL, 1825 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1826 CTLTYPE_INT, "maxifprefixes", 1827 SYSCTL_DESCR("Maximum number of prefixes created by" 1828 " route advertisement per interface"), 1829 NULL, 1, &ip6_maxifprefixes, 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, "maxifdefrouters", 1835 SYSCTL_DESCR("Maximum number of default routers created" 1836 " by route advertisement per interface"), 1837 NULL, 1, &ip6_maxifdefrouters, 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, "maxdynroutes", 1843 SYSCTL_DESCR("Maximum number of routes created via" 1844 " redirect"), 1845 NULL, 1, &ip6_maxdynroutes, 0, 1846 CTL_NET, PF_INET6, IPPROTO_IPV6, 1847 CTL_CREATE, CTL_EOL); 1848 } 1849 1850 void 1851 ip6_statinc(u_int stat) 1852 { 1853 1854 KASSERT(stat < IP6_NSTATS); 1855 IP6_STATINC(stat); 1856 } 1857