ip6_input.c revision 1.206
1 /* $NetBSD: ip6_input.c,v 1.206 2019/01/14 18:51:15 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 1.206 2019/01/14 18:51:15 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 KASSERT(m->m_len >= sizeof(struct ip6_hdr)); 358 ip6 = mtod(m, struct ip6_hdr *); 359 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst); 360 } 361 362 IP6_STATINC(IP6_STAT_NXTHIST + ip6->ip6_nxt); 363 364 #ifdef ALTQ 365 if (altq_input != NULL) { 366 SOFTNET_LOCK(); 367 if ((*altq_input)(m, AF_INET6) == 0) { 368 SOFTNET_UNLOCK(); 369 /* packet is dropped by traffic conditioner */ 370 return; 371 } 372 SOFTNET_UNLOCK(); 373 } 374 #endif 375 376 /* 377 * Disambiguate address scope zones (if there is ambiguity). 378 * We first make sure that the original source or destination address 379 * is not in our internal form for scoped addresses. Such addresses 380 * are not necessarily invalid spec-wise, but we cannot accept them due 381 * to the usage conflict. 382 * in6_setscope() then also checks and rejects the cases where src or 383 * dst are the loopback address and the receiving interface 384 * is not loopback. 385 */ 386 if (__predict_false( 387 m_makewritable(&m, 0, sizeof(struct ip6_hdr), M_DONTWAIT))) 388 goto bad; 389 ip6 = mtod(m, struct ip6_hdr *); 390 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) { 391 IP6_STATINC(IP6_STAT_BADSCOPE); /* XXX */ 392 goto bad; 393 } 394 if (in6_setscope(&ip6->ip6_src, rcvif, NULL) || 395 in6_setscope(&ip6->ip6_dst, rcvif, NULL)) { 396 IP6_STATINC(IP6_STAT_BADSCOPE); 397 goto bad; 398 } 399 400 ro = percpu_getref(ip6_forward_rt_percpu); 401 402 /* 403 * Multicast check 404 */ 405 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 406 bool ingroup; 407 408 in6_ifstat_inc(rcvif, ifs6_in_mcast); 409 /* 410 * See if we belong to the destination multicast group on the 411 * arrival interface. 412 */ 413 ingroup = in6_multi_group(&ip6->ip6_dst, rcvif); 414 if (ingroup) { 415 ours = 1; 416 } else if (!ip6_mrouter) { 417 uint64_t *ip6s = IP6_STAT_GETREF(); 418 ip6s[IP6_STAT_NOTMEMBER]++; 419 ip6s[IP6_STAT_CANTFORWARD]++; 420 IP6_STAT_PUTREF(); 421 in6_ifstat_inc(rcvif, ifs6_in_discard); 422 goto bad_unref; 423 } 424 deliverifp = rcvif; 425 goto hbhcheck; 426 } 427 428 sockaddr_in6_init(&u.dst6, &ip6->ip6_dst, 0, 0, 0); 429 430 /* 431 * Unicast check 432 */ 433 rt = rtcache_lookup2(ro, &u.dst, 1, &hit); 434 if (hit) 435 IP6_STATINC(IP6_STAT_FORWARD_CACHEHIT); 436 else 437 IP6_STATINC(IP6_STAT_FORWARD_CACHEMISS); 438 439 /* 440 * Accept the packet if the forwarding interface to the destination 441 * (according to the routing table) is the loopback interface, 442 * unless the associated route has a gateway. 443 * 444 * We don't explicitly match ip6_dst against an interface here. It 445 * is already done in rtcache_lookup2: rt->rt_ifp->if_type will be 446 * IFT_LOOP if the packet is for us. 447 * 448 * Note that this approach causes to accept a packet if there is a 449 * route to the loopback interface for the destination of the packet. 450 * But we think it's even useful in some situations, e.g. when using 451 * a special daemon which wants to intercept the packet. 452 */ 453 if (rt != NULL && 454 (rt->rt_flags & (RTF_HOST|RTF_GATEWAY)) == RTF_HOST && 455 rt->rt_ifp->if_type == IFT_LOOP) { 456 struct in6_ifaddr *ia6 = (struct in6_ifaddr *)rt->rt_ifa; 457 int addrok; 458 459 if (ia6->ia6_flags & IN6_IFF_ANYCAST) 460 m->m_flags |= M_ANYCAST6; 461 /* 462 * packets to a tentative, duplicated, or somehow invalid 463 * address must not be accepted. 464 */ 465 if (ia6->ia6_flags & IN6_IFF_NOTREADY) 466 addrok = 0; 467 else if (ia6->ia6_flags & IN6_IFF_DETACHED && 468 !IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) 469 { 470 /* Allow internal traffic to DETACHED addresses */ 471 struct sockaddr_in6 sin6; 472 int s; 473 474 memset(&sin6, 0, sizeof(sin6)); 475 sin6.sin6_family = AF_INET6; 476 sin6.sin6_len = sizeof(sin6); 477 sin6.sin6_addr = ip6->ip6_src; 478 s = pserialize_read_enter(); 479 addrok = (ifa_ifwithaddr(sin6tosa(&sin6)) != NULL); 480 pserialize_read_exit(s); 481 } else 482 addrok = 1; 483 if (addrok) { 484 /* this address is ready */ 485 ours = 1; 486 deliverifp = ia6->ia_ifp; /* correct? */ 487 goto hbhcheck; 488 } else { 489 /* address is not ready, so discard the packet. */ 490 char ip6bufs[INET6_ADDRSTRLEN]; 491 char ip6bufd[INET6_ADDRSTRLEN]; 492 nd6log(LOG_INFO, "packet to an unready address %s->%s\n", 493 IN6_PRINT(ip6bufs, &ip6->ip6_src), 494 IN6_PRINT(ip6bufd, &ip6->ip6_dst)); 495 496 goto bad_unref; 497 } 498 } 499 500 /* 501 * FAITH (Firewall Aided Internet Translator) 502 */ 503 #if defined(NFAITH) && 0 < NFAITH 504 if (ip6_keepfaith) { 505 if (rt != NULL && rt->rt_ifp != NULL && 506 rt->rt_ifp->if_type == IFT_FAITH) { 507 /* XXX do we need more sanity checks? */ 508 ours = 1; 509 deliverifp = rt->rt_ifp; /* faith */ 510 goto hbhcheck; 511 } 512 } 513 #endif 514 515 /* 516 * Now there is no reason to process the packet if it's not our own 517 * and we're not a router. 518 */ 519 if (!ip6_forwarding) { 520 IP6_STATINC(IP6_STAT_CANTFORWARD); 521 in6_ifstat_inc(rcvif, ifs6_in_discard); 522 goto bad_unref; 523 } 524 525 hbhcheck: 526 /* 527 * Record address information into m_tag, if we don't have one yet. 528 * Note that we are unable to record it, if the address is not listed 529 * as our interface address (e.g. multicast addresses, addresses 530 * within FAITH prefixes and such). 531 */ 532 if (deliverifp && ip6_getdstifaddr(m) == NULL) { 533 struct in6_ifaddr *ia6; 534 int s = pserialize_read_enter(); 535 536 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 537 /* Depends on ip6_setdstifaddr never sleep */ 538 if (ia6 != NULL && ip6_setdstifaddr(m, ia6) == NULL) { 539 /* 540 * XXX maybe we should drop the packet here, 541 * as we could not provide enough information 542 * to the upper layers. 543 */ 544 } 545 pserialize_read_exit(s); 546 } 547 548 /* 549 * Process Hop-by-Hop options header if it's contained. 550 * m may be modified in ip6_hopopts_input(). 551 * If a JumboPayload option is included, plen will also be modified. 552 */ 553 plen = (u_int32_t)ntohs(ip6->ip6_plen); 554 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 555 struct ip6_hbh *hbh; 556 557 if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) { 558 /* m already freed */ 559 in6_ifstat_inc(rcvif, ifs6_in_discard); 560 rtcache_unref(rt, ro); 561 percpu_putref(ip6_forward_rt_percpu); 562 return; 563 } 564 565 /* adjust pointer */ 566 ip6 = mtod(m, struct ip6_hdr *); 567 568 /* 569 * if the payload length field is 0 and the next header field 570 * indicates Hop-by-Hop Options header, then a Jumbo Payload 571 * option MUST be included. 572 */ 573 if (ip6->ip6_plen == 0 && plen == 0) { 574 /* 575 * Note that if a valid jumbo payload option is 576 * contained, ip6_hopopts_input() must set a valid 577 * (non-zero) payload length to the variable plen. 578 */ 579 IP6_STATINC(IP6_STAT_BADOPTIONS); 580 in6_ifstat_inc(rcvif, ifs6_in_discard); 581 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 582 icmp6_error(m, ICMP6_PARAM_PROB, 583 ICMP6_PARAMPROB_HEADER, 584 (char *)&ip6->ip6_plen - (char *)ip6); 585 rtcache_unref(rt, ro); 586 percpu_putref(ip6_forward_rt_percpu); 587 return; 588 } 589 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 590 sizeof(struct ip6_hbh)); 591 if (hbh == NULL) { 592 IP6_STATINC(IP6_STAT_TOOSHORT); 593 rtcache_unref(rt, ro); 594 percpu_putref(ip6_forward_rt_percpu); 595 return; 596 } 597 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 598 nxt = hbh->ip6h_nxt; 599 600 /* 601 * accept the packet if a router alert option is included 602 * and we act as an IPv6 router. 603 */ 604 if (rtalert != ~0 && ip6_forwarding) 605 ours = 1; 606 } else 607 nxt = ip6->ip6_nxt; 608 609 /* 610 * Check that the amount of data in the buffers is at least much as 611 * the IPv6 header would have us expect. Trim mbufs if longer than we 612 * expect. Drop packet if shorter than we expect. 613 */ 614 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 615 IP6_STATINC(IP6_STAT_TOOSHORT); 616 in6_ifstat_inc(rcvif, ifs6_in_truncated); 617 goto bad_unref; 618 } 619 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 620 if (m->m_len == m->m_pkthdr.len) { 621 m->m_len = sizeof(struct ip6_hdr) + plen; 622 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 623 } else 624 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 625 } 626 627 /* 628 * Forward if desirable. 629 */ 630 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 631 /* 632 * If we are acting as a multicast router, all 633 * incoming multicast packets are passed to the 634 * kernel-level multicast forwarding function. 635 * The packet is returned (relatively) intact; if 636 * ip6_mforward() returns a non-zero value, the packet 637 * must be discarded, else it may be accepted below. 638 */ 639 if (ip6_mrouter != NULL) { 640 int error; 641 642 SOFTNET_LOCK(); 643 error = ip6_mforward(ip6, rcvif, m); 644 SOFTNET_UNLOCK(); 645 646 if (error != 0) { 647 rtcache_unref(rt, ro); 648 percpu_putref(ip6_forward_rt_percpu); 649 IP6_STATINC(IP6_STAT_CANTFORWARD); 650 goto bad; 651 } 652 } 653 if (!ours) 654 goto bad_unref; 655 } else if (!ours) { 656 rtcache_unref(rt, ro); 657 percpu_putref(ip6_forward_rt_percpu); 658 ip6_forward(m, srcrt); 659 return; 660 } 661 662 ip6 = mtod(m, struct ip6_hdr *); 663 664 /* 665 * Malicious party may be able to use IPv4 mapped addr to confuse 666 * tcp/udp stack and bypass security checks (act as if it was from 667 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious. 668 * 669 * For SIIT end node behavior, you may want to disable the check. 670 * However, you will become vulnerable to attacks using IPv4 mapped 671 * source. 672 */ 673 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 674 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 675 IP6_STATINC(IP6_STAT_BADSCOPE); 676 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 677 goto bad_unref; 678 } 679 680 #ifdef IFA_STATS 681 if (deliverifp != NULL) { 682 struct in6_ifaddr *ia6; 683 int s = pserialize_read_enter(); 684 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 685 if (ia6) 686 ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len; 687 pserialize_read_exit(s); 688 } 689 #endif 690 IP6_STATINC(IP6_STAT_DELIVERED); 691 in6_ifstat_inc(deliverifp, ifs6_in_deliver); 692 nest = 0; 693 694 if (rt != NULL) { 695 rtcache_unref(rt, ro); 696 rt = NULL; 697 } 698 percpu_putref(ip6_forward_rt_percpu); 699 700 rh_present = 0; 701 frg_present = 0; 702 while (nxt != IPPROTO_DONE) { 703 if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) { 704 IP6_STATINC(IP6_STAT_TOOMANYHDR); 705 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 706 goto bad; 707 } 708 709 M_VERIFY_PACKET(m); 710 711 /* 712 * protection against faulty packet - there should be 713 * more sanity checks in header chain processing. 714 */ 715 if (m->m_pkthdr.len < off) { 716 IP6_STATINC(IP6_STAT_TOOSHORT); 717 in6_ifstat_inc(rcvif, ifs6_in_truncated); 718 goto bad; 719 } 720 721 if (nxt == IPPROTO_ROUTING) { 722 if (rh_present++) { 723 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 724 IP6_STATINC(IP6_STAT_BADOPTIONS); 725 goto bad; 726 } 727 } else if (nxt == IPPROTO_FRAGMENT) { 728 if (frg_present++) { 729 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 730 IP6_STATINC(IP6_STAT_BADOPTIONS); 731 goto bad; 732 } 733 } 734 735 #ifdef IPSEC 736 if (ipsec_used) { 737 /* 738 * Enforce IPsec policy checking if we are seeing last 739 * header. Note that we do not visit this with 740 * protocols with pcb layer code - like udp/tcp/raw ip. 741 */ 742 if ((inet6sw[ip6_protox[nxt]].pr_flags 743 & PR_LASTHDR) != 0) { 744 int error; 745 746 error = ipsec_ip_input(m, false); 747 if (error) 748 goto bad; 749 } 750 } 751 #endif 752 753 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt); 754 } 755 return; 756 757 bad_unref: 758 rtcache_unref(rt, ro); 759 percpu_putref(ip6_forward_rt_percpu); 760 bad: 761 m_freem(m); 762 return; 763 } 764 765 static bool 766 ip6_badaddr(struct ip6_hdr *ip6) 767 { 768 /* Check against address spoofing/corruption. */ 769 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) || 770 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) { 771 return true; 772 } 773 774 /* 775 * The following check is not documented in specs. A malicious 776 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack 777 * and bypass security checks (act as if it was from 127.0.0.1 by using 778 * IPv6 src ::ffff:127.0.0.1). Be cautious. 779 * 780 * This check chokes if we are in an SIIT cloud. As none of BSDs 781 * support IPv4-less kernel compilation, we cannot support SIIT 782 * environment at all. So, it makes more sense for us to reject any 783 * malicious packets for non-SIIT environment, than try to do a 784 * partial support for SIIT environment. 785 */ 786 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 787 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 788 return true; 789 } 790 791 /* 792 * Reject packets with IPv4-compatible IPv6 addresses (RFC4291). 793 */ 794 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) || 795 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) { 796 return true; 797 } 798 799 return false; 800 } 801 802 /* 803 * set/grab in6_ifaddr correspond to IPv6 destination address. 804 */ 805 static struct m_tag * 806 ip6_setdstifaddr(struct mbuf *m, const struct in6_ifaddr *ia) 807 { 808 struct m_tag *mtag; 809 struct ip6aux *ip6a; 810 811 mtag = ip6_addaux(m); 812 if (mtag == NULL) 813 return NULL; 814 815 ip6a = (struct ip6aux *)(mtag + 1); 816 if (in6_setscope(&ip6a->ip6a_src, ia->ia_ifp, &ip6a->ip6a_scope_id)) { 817 IP6_STATINC(IP6_STAT_BADSCOPE); 818 return NULL; 819 } 820 821 ip6a->ip6a_src = ia->ia_addr.sin6_addr; 822 ip6a->ip6a_flags = ia->ia6_flags; 823 return mtag; 824 } 825 826 const struct ip6aux * 827 ip6_getdstifaddr(struct mbuf *m) 828 { 829 struct m_tag *mtag; 830 831 mtag = ip6_findaux(m); 832 if (mtag != NULL) 833 return (struct ip6aux *)(mtag + 1); 834 else 835 return NULL; 836 } 837 838 /* 839 * Hop-by-Hop options header processing. If a valid jumbo payload option is 840 * included, the real payload length will be stored in plenp. 841 * 842 * rtalertp - XXX: should be stored more smart way 843 */ 844 int 845 ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp, 846 struct mbuf **mp, int *offp) 847 { 848 struct mbuf *m = *mp; 849 int off = *offp, hbhlen; 850 struct ip6_hbh *hbh; 851 852 /* validation of the length of the header */ 853 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, 854 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh)); 855 if (hbh == NULL) { 856 IP6_STATINC(IP6_STAT_TOOSHORT); 857 return -1; 858 } 859 hbhlen = (hbh->ip6h_len + 1) << 3; 860 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 861 hbhlen); 862 if (hbh == NULL) { 863 IP6_STATINC(IP6_STAT_TOOSHORT); 864 return -1; 865 } 866 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 867 off += hbhlen; 868 hbhlen -= sizeof(struct ip6_hbh); 869 870 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 871 hbhlen, rtalertp, plenp) < 0) 872 return -1; 873 874 *offp = off; 875 *mp = m; 876 return 0; 877 } 878 879 /* 880 * Search header for all Hop-by-hop options and process each option. 881 * This function is separate from ip6_hopopts_input() in order to 882 * handle a case where the sending node itself process its hop-by-hop 883 * options header. In such a case, the function is called from ip6_output(). 884 * 885 * The function assumes that hbh header is located right after the IPv6 header 886 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to 887 * opthead + hbhlen is located in continuous memory region. 888 */ 889 static int 890 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen, 891 u_int32_t *rtalertp, u_int32_t *plenp) 892 { 893 struct ip6_hdr *ip6; 894 int optlen = 0; 895 u_int8_t *opt = opthead; 896 u_int16_t rtalert_val; 897 u_int32_t jumboplen; 898 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh); 899 900 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 901 switch (*opt) { 902 case IP6OPT_PAD1: 903 optlen = 1; 904 break; 905 case IP6OPT_PADN: 906 if (hbhlen < IP6OPT_MINLEN) { 907 IP6_STATINC(IP6_STAT_TOOSMALL); 908 goto bad; 909 } 910 optlen = *(opt + 1) + 2; 911 break; 912 case IP6OPT_RTALERT: 913 /* XXX may need check for alignment */ 914 if (hbhlen < IP6OPT_RTALERT_LEN) { 915 IP6_STATINC(IP6_STAT_TOOSMALL); 916 goto bad; 917 } 918 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) { 919 /* XXX stat */ 920 icmp6_error(m, ICMP6_PARAM_PROB, 921 ICMP6_PARAMPROB_HEADER, 922 erroff + opt + 1 - opthead); 923 return (-1); 924 } 925 optlen = IP6OPT_RTALERT_LEN; 926 memcpy((void *)&rtalert_val, (void *)(opt + 2), 2); 927 *rtalertp = ntohs(rtalert_val); 928 break; 929 case IP6OPT_JUMBO: 930 /* XXX may need check for alignment */ 931 if (hbhlen < IP6OPT_JUMBO_LEN) { 932 IP6_STATINC(IP6_STAT_TOOSMALL); 933 goto bad; 934 } 935 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) { 936 /* XXX stat */ 937 icmp6_error(m, ICMP6_PARAM_PROB, 938 ICMP6_PARAMPROB_HEADER, 939 erroff + opt + 1 - opthead); 940 return (-1); 941 } 942 optlen = IP6OPT_JUMBO_LEN; 943 944 /* 945 * IPv6 packets that have non 0 payload length 946 * must not contain a jumbo payload option. 947 */ 948 ip6 = mtod(m, struct ip6_hdr *); 949 if (ip6->ip6_plen) { 950 IP6_STATINC(IP6_STAT_BADOPTIONS); 951 icmp6_error(m, ICMP6_PARAM_PROB, 952 ICMP6_PARAMPROB_HEADER, 953 erroff + opt - opthead); 954 return (-1); 955 } 956 957 /* 958 * We may see jumbolen in unaligned location, so 959 * we'd need to perform memcpy(). 960 */ 961 memcpy(&jumboplen, opt + 2, sizeof(jumboplen)); 962 jumboplen = (u_int32_t)htonl(jumboplen); 963 964 #if 1 965 /* 966 * if there are multiple jumbo payload options, 967 * *plenp will be non-zero and the packet will be 968 * rejected. 969 * the behavior may need some debate in ipngwg - 970 * multiple options does not make sense, however, 971 * there's no explicit mention in specification. 972 */ 973 if (*plenp != 0) { 974 IP6_STATINC(IP6_STAT_BADOPTIONS); 975 icmp6_error(m, ICMP6_PARAM_PROB, 976 ICMP6_PARAMPROB_HEADER, 977 erroff + opt + 2 - opthead); 978 return (-1); 979 } 980 #endif 981 982 /* 983 * jumbo payload length must be larger than 65535. 984 */ 985 if (jumboplen <= IPV6_MAXPACKET) { 986 IP6_STATINC(IP6_STAT_BADOPTIONS); 987 icmp6_error(m, ICMP6_PARAM_PROB, 988 ICMP6_PARAMPROB_HEADER, 989 erroff + opt + 2 - opthead); 990 return (-1); 991 } 992 *plenp = jumboplen; 993 994 break; 995 default: /* unknown option */ 996 if (hbhlen < IP6OPT_MINLEN) { 997 IP6_STATINC(IP6_STAT_TOOSMALL); 998 goto bad; 999 } 1000 optlen = ip6_unknown_opt(opt, m, 1001 erroff + opt - opthead); 1002 if (optlen == -1) 1003 return (-1); 1004 optlen += 2; 1005 break; 1006 } 1007 } 1008 1009 return (0); 1010 1011 bad: 1012 m_freem(m); 1013 return (-1); 1014 } 1015 1016 /* 1017 * Unknown option processing. 1018 * The third argument `off' is the offset from the IPv6 header to the option, 1019 * which is necessary if the IPv6 header the and option header and IPv6 header 1020 * is not continuous in order to return an ICMPv6 error. 1021 */ 1022 int 1023 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off) 1024 { 1025 struct ip6_hdr *ip6; 1026 1027 switch (IP6OPT_TYPE(*optp)) { 1028 case IP6OPT_TYPE_SKIP: /* ignore the option */ 1029 return ((int)*(optp + 1)); 1030 case IP6OPT_TYPE_DISCARD: /* silently discard */ 1031 m_freem(m); 1032 return (-1); 1033 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 1034 IP6_STATINC(IP6_STAT_BADOPTIONS); 1035 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 1036 return (-1); 1037 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 1038 IP6_STATINC(IP6_STAT_BADOPTIONS); 1039 ip6 = mtod(m, struct ip6_hdr *); 1040 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 1041 (m->m_flags & (M_BCAST|M_MCAST))) 1042 m_freem(m); 1043 else 1044 icmp6_error(m, ICMP6_PARAM_PROB, 1045 ICMP6_PARAMPROB_OPTION, off); 1046 return (-1); 1047 } 1048 1049 m_freem(m); /* XXX: NOTREACHED */ 1050 return (-1); 1051 } 1052 1053 void 1054 ip6_savecontrol(struct in6pcb *in6p, struct mbuf **mp, 1055 struct ip6_hdr *ip6, struct mbuf *m) 1056 { 1057 struct socket *so = in6p->in6p_socket; 1058 #ifdef RFC2292 1059 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y)) 1060 #else 1061 #define IS2292(x, y) (y) 1062 #endif 1063 1064 if (SOOPT_TIMESTAMP(so->so_options)) 1065 mp = sbsavetimestamp(so->so_options, mp); 1066 1067 /* some OSes call this logic with IPv4 packet, for SO_TIMESTAMP */ 1068 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) 1069 return; 1070 1071 /* RFC 2292 sec. 5 */ 1072 if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) { 1073 struct in6_pktinfo pi6; 1074 1075 memcpy(&pi6.ipi6_addr, &ip6->ip6_dst, sizeof(struct in6_addr)); 1076 in6_clearscope(&pi6.ipi6_addr); /* XXX */ 1077 pi6.ipi6_ifindex = m->m_pkthdr.rcvif_index; 1078 *mp = sbcreatecontrol(&pi6, sizeof(pi6), 1079 IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6); 1080 if (*mp) 1081 mp = &(*mp)->m_next; 1082 } 1083 1084 if (in6p->in6p_flags & IN6P_HOPLIMIT) { 1085 int hlim = ip6->ip6_hlim & 0xff; 1086 1087 *mp = sbcreatecontrol(&hlim, sizeof(hlim), 1088 IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6); 1089 if (*mp) 1090 mp = &(*mp)->m_next; 1091 } 1092 1093 if ((in6p->in6p_flags & IN6P_TCLASS) != 0) { 1094 u_int32_t flowinfo; 1095 int tclass; 1096 1097 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK); 1098 flowinfo >>= 20; 1099 1100 tclass = flowinfo & 0xff; 1101 *mp = sbcreatecontrol(&tclass, sizeof(tclass), 1102 IPV6_TCLASS, IPPROTO_IPV6); 1103 1104 if (*mp) 1105 mp = &(*mp)->m_next; 1106 } 1107 1108 /* 1109 * IPV6_HOPOPTS socket option. Recall that we required super-user 1110 * privilege for the option (see ip6_ctloutput), but it might be too 1111 * strict, since there might be some hop-by-hop options which can be 1112 * returned to normal user. 1113 * See also RFC3542 section 8 (or RFC2292 section 6). 1114 */ 1115 if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0) { 1116 /* 1117 * Check if a hop-by-hop options header is contatined in the 1118 * received packet, and if so, store the options as ancillary 1119 * data. Note that a hop-by-hop options header must be 1120 * just after the IPv6 header, which fact is assured through 1121 * the IPv6 input processing. 1122 */ 1123 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1124 if (xip6->ip6_nxt == IPPROTO_HOPOPTS) { 1125 struct ip6_hbh *hbh; 1126 int hbhlen; 1127 struct mbuf *ext; 1128 1129 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr), 1130 xip6->ip6_nxt); 1131 if (ext == NULL) { 1132 IP6_STATINC(IP6_STAT_TOOSHORT); 1133 return; 1134 } 1135 hbh = mtod(ext, struct ip6_hbh *); 1136 hbhlen = (hbh->ip6h_len + 1) << 3; 1137 if (hbhlen != ext->m_len) { 1138 m_freem(ext); 1139 IP6_STATINC(IP6_STAT_TOOSHORT); 1140 return; 1141 } 1142 1143 /* 1144 * XXX: We copy whole the header even if a jumbo 1145 * payload option is included, which option is to 1146 * be removed before returning in the RFC 2292. 1147 * Note: this constraint is removed in RFC3542. 1148 */ 1149 *mp = sbcreatecontrol(hbh, hbhlen, 1150 IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS), 1151 IPPROTO_IPV6); 1152 if (*mp) 1153 mp = &(*mp)->m_next; 1154 m_freem(ext); 1155 } 1156 } 1157 1158 /* IPV6_DSTOPTS and IPV6_RTHDR socket options */ 1159 if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) { 1160 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1161 int nxt = xip6->ip6_nxt, off = sizeof(struct ip6_hdr); 1162 1163 /* 1164 * Search for destination options headers or routing 1165 * header(s) through the header chain, and stores each 1166 * header as ancillary data. 1167 * Note that the order of the headers remains in 1168 * the chain of ancillary data. 1169 */ 1170 for (;;) { /* is explicit loop prevention necessary? */ 1171 struct ip6_ext *ip6e = NULL; 1172 int elen; 1173 struct mbuf *ext = NULL; 1174 1175 /* 1176 * if it is not an extension header, don't try to 1177 * pull it from the chain. 1178 */ 1179 switch (nxt) { 1180 case IPPROTO_DSTOPTS: 1181 case IPPROTO_ROUTING: 1182 case IPPROTO_HOPOPTS: 1183 case IPPROTO_AH: /* is it possible? */ 1184 break; 1185 default: 1186 goto loopend; 1187 } 1188 1189 ext = ip6_pullexthdr(m, off, nxt); 1190 if (ext == NULL) { 1191 IP6_STATINC(IP6_STAT_TOOSHORT); 1192 return; 1193 } 1194 ip6e = mtod(ext, struct ip6_ext *); 1195 if (nxt == IPPROTO_AH) 1196 elen = (ip6e->ip6e_len + 2) << 2; 1197 else 1198 elen = (ip6e->ip6e_len + 1) << 3; 1199 if (elen != ext->m_len) { 1200 m_freem(ext); 1201 IP6_STATINC(IP6_STAT_TOOSHORT); 1202 return; 1203 } 1204 KASSERT(IP6_HDR_ALIGNED_P(ip6e)); 1205 1206 switch (nxt) { 1207 case IPPROTO_DSTOPTS: 1208 if (!(in6p->in6p_flags & IN6P_DSTOPTS)) 1209 break; 1210 1211 *mp = sbcreatecontrol(ip6e, elen, 1212 IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS), 1213 IPPROTO_IPV6); 1214 if (*mp) 1215 mp = &(*mp)->m_next; 1216 break; 1217 1218 case IPPROTO_ROUTING: 1219 if (!(in6p->in6p_flags & IN6P_RTHDR)) 1220 break; 1221 1222 *mp = sbcreatecontrol(ip6e, elen, 1223 IS2292(IPV6_2292RTHDR, IPV6_RTHDR), 1224 IPPROTO_IPV6); 1225 if (*mp) 1226 mp = &(*mp)->m_next; 1227 break; 1228 1229 case IPPROTO_HOPOPTS: 1230 case IPPROTO_AH: /* is it possible? */ 1231 break; 1232 1233 default: 1234 /* 1235 * other cases have been filtered in the above. 1236 * none will visit this case. here we supply 1237 * the code just in case (nxt overwritten or 1238 * other cases). 1239 */ 1240 m_freem(ext); 1241 goto loopend; 1242 1243 } 1244 1245 /* proceed with the next header. */ 1246 off += elen; 1247 nxt = ip6e->ip6e_nxt; 1248 ip6e = NULL; 1249 m_freem(ext); 1250 ext = NULL; 1251 } 1252 loopend: 1253 ; 1254 } 1255 } 1256 #undef IS2292 1257 1258 1259 void 1260 ip6_notify_pmtu(struct in6pcb *in6p, const struct sockaddr_in6 *dst, 1261 uint32_t *mtu) 1262 { 1263 struct socket *so; 1264 struct mbuf *m_mtu; 1265 struct ip6_mtuinfo mtuctl; 1266 1267 so = in6p->in6p_socket; 1268 1269 if (mtu == NULL) 1270 return; 1271 1272 KASSERT(so != NULL); 1273 1274 memset(&mtuctl, 0, sizeof(mtuctl)); /* zero-clear for safety */ 1275 mtuctl.ip6m_mtu = *mtu; 1276 mtuctl.ip6m_addr = *dst; 1277 if (sa6_recoverscope(&mtuctl.ip6m_addr)) 1278 return; 1279 1280 if ((m_mtu = sbcreatecontrol(&mtuctl, sizeof(mtuctl), 1281 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL) 1282 return; 1283 1284 if (sbappendaddr(&so->so_rcv, (const struct sockaddr *)dst, NULL, m_mtu) 1285 == 0) { 1286 soroverflow(so); 1287 m_freem(m_mtu); 1288 } else 1289 sorwakeup(so); 1290 1291 return; 1292 } 1293 1294 /* 1295 * pull single extension header from mbuf chain. returns single mbuf that 1296 * contains the result, or NULL on error. 1297 */ 1298 static struct mbuf * 1299 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt) 1300 { 1301 struct ip6_ext ip6e; 1302 size_t elen; 1303 struct mbuf *n; 1304 1305 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1306 if (nxt == IPPROTO_AH) 1307 elen = (ip6e.ip6e_len + 2) << 2; 1308 else 1309 elen = (ip6e.ip6e_len + 1) << 3; 1310 1311 MGET(n, M_DONTWAIT, MT_DATA); 1312 if (n && elen >= MLEN) { 1313 MCLGET(n, M_DONTWAIT); 1314 if ((n->m_flags & M_EXT) == 0) { 1315 m_free(n); 1316 n = NULL; 1317 } 1318 } 1319 if (!n) 1320 return NULL; 1321 1322 n->m_len = 0; 1323 if (elen >= M_TRAILINGSPACE(n)) { 1324 m_free(n); 1325 return NULL; 1326 } 1327 1328 m_copydata(m, off, elen, mtod(n, void *)); 1329 n->m_len = elen; 1330 return n; 1331 } 1332 1333 /* 1334 * Get offset to the previous header followed by the header 1335 * currently processed. 1336 */ 1337 int 1338 ip6_get_prevhdr(struct mbuf *m, int off) 1339 { 1340 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1341 1342 if (off == sizeof(struct ip6_hdr)) { 1343 return offsetof(struct ip6_hdr, ip6_nxt); 1344 } else if (off < sizeof(struct ip6_hdr)) { 1345 panic("%s: off < sizeof(struct ip6_hdr)", __func__); 1346 } else { 1347 int len, nlen, nxt; 1348 struct ip6_ext ip6e; 1349 1350 nxt = ip6->ip6_nxt; 1351 len = sizeof(struct ip6_hdr); 1352 nlen = 0; 1353 while (len < off) { 1354 m_copydata(m, len, sizeof(ip6e), &ip6e); 1355 1356 switch (nxt) { 1357 case IPPROTO_FRAGMENT: 1358 nlen = sizeof(struct ip6_frag); 1359 break; 1360 case IPPROTO_AH: 1361 nlen = (ip6e.ip6e_len + 2) << 2; 1362 break; 1363 default: 1364 nlen = (ip6e.ip6e_len + 1) << 3; 1365 break; 1366 } 1367 len += nlen; 1368 nxt = ip6e.ip6e_nxt; 1369 } 1370 1371 return (len - nlen); 1372 } 1373 } 1374 1375 /* 1376 * get next header offset. m will be retained. 1377 */ 1378 int 1379 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp) 1380 { 1381 struct ip6_hdr ip6; 1382 struct ip6_ext ip6e; 1383 struct ip6_frag fh; 1384 1385 /* just in case */ 1386 if (m == NULL) 1387 panic("%s: m == NULL", __func__); 1388 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off) 1389 return -1; 1390 1391 switch (proto) { 1392 case IPPROTO_IPV6: 1393 /* do not chase beyond intermediate IPv6 headers */ 1394 if (off != 0) 1395 return -1; 1396 if (m->m_pkthdr.len < off + sizeof(ip6)) 1397 return -1; 1398 m_copydata(m, off, sizeof(ip6), (void *)&ip6); 1399 if (nxtp) 1400 *nxtp = ip6.ip6_nxt; 1401 off += sizeof(ip6); 1402 return off; 1403 1404 case IPPROTO_FRAGMENT: 1405 /* 1406 * terminate parsing if it is not the first fragment, 1407 * it does not make sense to parse through it. 1408 */ 1409 if (m->m_pkthdr.len < off + sizeof(fh)) 1410 return -1; 1411 m_copydata(m, off, sizeof(fh), (void *)&fh); 1412 if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0) 1413 return -1; 1414 if (nxtp) 1415 *nxtp = fh.ip6f_nxt; 1416 off += sizeof(struct ip6_frag); 1417 return off; 1418 1419 case IPPROTO_AH: 1420 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1421 return -1; 1422 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1423 if (nxtp) 1424 *nxtp = ip6e.ip6e_nxt; 1425 off += (ip6e.ip6e_len + 2) << 2; 1426 if (m->m_pkthdr.len < off) 1427 return -1; 1428 return off; 1429 1430 case IPPROTO_HOPOPTS: 1431 case IPPROTO_ROUTING: 1432 case IPPROTO_DSTOPTS: 1433 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1434 return -1; 1435 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1436 if (nxtp) 1437 *nxtp = ip6e.ip6e_nxt; 1438 off += (ip6e.ip6e_len + 1) << 3; 1439 if (m->m_pkthdr.len < off) 1440 return -1; 1441 return off; 1442 1443 case IPPROTO_NONE: 1444 case IPPROTO_ESP: 1445 case IPPROTO_IPCOMP: 1446 /* give up */ 1447 return -1; 1448 1449 default: 1450 return -1; 1451 } 1452 } 1453 1454 /* 1455 * get offset for the last header in the chain. m will be kept untainted. 1456 */ 1457 int 1458 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp) 1459 { 1460 int newoff; 1461 int nxt; 1462 1463 if (!nxtp) { 1464 nxt = -1; 1465 nxtp = &nxt; 1466 } 1467 for (;;) { 1468 newoff = ip6_nexthdr(m, off, proto, nxtp); 1469 if (newoff < 0) 1470 return off; 1471 else if (newoff < off) 1472 return -1; /* invalid */ 1473 else if (newoff == off) 1474 return newoff; 1475 1476 off = newoff; 1477 proto = *nxtp; 1478 } 1479 } 1480 1481 struct m_tag * 1482 ip6_addaux(struct mbuf *m) 1483 { 1484 struct m_tag *mtag; 1485 1486 mtag = m_tag_find(m, PACKET_TAG_INET6); 1487 if (!mtag) { 1488 mtag = m_tag_get(PACKET_TAG_INET6, sizeof(struct ip6aux), 1489 M_NOWAIT); 1490 if (mtag) { 1491 m_tag_prepend(m, mtag); 1492 memset(mtag + 1, 0, sizeof(struct ip6aux)); 1493 } 1494 } 1495 return mtag; 1496 } 1497 1498 struct m_tag * 1499 ip6_findaux(struct mbuf *m) 1500 { 1501 struct m_tag *mtag; 1502 1503 mtag = m_tag_find(m, PACKET_TAG_INET6); 1504 return mtag; 1505 } 1506 1507 void 1508 ip6_delaux(struct mbuf *m) 1509 { 1510 struct m_tag *mtag; 1511 1512 mtag = m_tag_find(m, PACKET_TAG_INET6); 1513 if (mtag) 1514 m_tag_delete(m, mtag); 1515 } 1516 1517 /* 1518 * System control for IP6 1519 */ 1520 1521 const u_char inet6ctlerrmap[PRC_NCMDS] = { 1522 0, 0, 0, 0, 1523 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 1524 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 1525 EMSGSIZE, EHOSTUNREACH, 0, 0, 1526 0, 0, 0, 0, 1527 ENOPROTOOPT 1528 }; 1529 1530 extern int sysctl_net_inet6_addrctlpolicy(SYSCTLFN_ARGS); 1531 1532 static int 1533 sysctl_net_inet6_ip6_stats(SYSCTLFN_ARGS) 1534 { 1535 1536 return (NETSTAT_SYSCTL(ip6stat_percpu, IP6_NSTATS)); 1537 } 1538 1539 static void 1540 sysctl_net_inet6_ip6_setup(struct sysctllog **clog) 1541 { 1542 1543 sysctl_createv(clog, 0, NULL, NULL, 1544 CTLFLAG_PERMANENT, 1545 CTLTYPE_NODE, "inet6", 1546 SYSCTL_DESCR("PF_INET6 related settings"), 1547 NULL, 0, NULL, 0, 1548 CTL_NET, PF_INET6, CTL_EOL); 1549 sysctl_createv(clog, 0, NULL, NULL, 1550 CTLFLAG_PERMANENT, 1551 CTLTYPE_NODE, "ip6", 1552 SYSCTL_DESCR("IPv6 related settings"), 1553 NULL, 0, NULL, 0, 1554 CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_EOL); 1555 1556 sysctl_createv(clog, 0, NULL, NULL, 1557 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1558 CTLTYPE_INT, "forwarding", 1559 SYSCTL_DESCR("Enable forwarding of INET6 datagrams"), 1560 NULL, 0, &ip6_forwarding, 0, 1561 CTL_NET, PF_INET6, IPPROTO_IPV6, 1562 IPV6CTL_FORWARDING, CTL_EOL); 1563 sysctl_createv(clog, 0, NULL, NULL, 1564 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1565 CTLTYPE_INT, "redirect", 1566 SYSCTL_DESCR("Enable sending of ICMPv6 redirect messages"), 1567 NULL, 0, &ip6_sendredirects, 0, 1568 CTL_NET, PF_INET6, IPPROTO_IPV6, 1569 IPV6CTL_SENDREDIRECTS, CTL_EOL); 1570 sysctl_createv(clog, 0, NULL, NULL, 1571 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1572 CTLTYPE_INT, "hlim", 1573 SYSCTL_DESCR("Hop limit for an INET6 datagram"), 1574 NULL, 0, &ip6_defhlim, 0, 1575 CTL_NET, PF_INET6, IPPROTO_IPV6, 1576 IPV6CTL_DEFHLIM, CTL_EOL); 1577 sysctl_createv(clog, 0, NULL, NULL, 1578 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1579 CTLTYPE_INT, "maxfragpackets", 1580 SYSCTL_DESCR("Maximum number of fragments to buffer " 1581 "for reassembly"), 1582 NULL, 0, &ip6_maxfragpackets, 0, 1583 CTL_NET, PF_INET6, IPPROTO_IPV6, 1584 IPV6CTL_MAXFRAGPACKETS, CTL_EOL); 1585 sysctl_createv(clog, 0, NULL, NULL, 1586 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1587 CTLTYPE_INT, "accept_rtadv", 1588 SYSCTL_DESCR("Accept router advertisements"), 1589 NULL, 0, &ip6_accept_rtadv, 0, 1590 CTL_NET, PF_INET6, IPPROTO_IPV6, 1591 IPV6CTL_ACCEPT_RTADV, CTL_EOL); 1592 sysctl_createv(clog, 0, NULL, NULL, 1593 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1594 CTLTYPE_INT, "rtadv_maxroutes", 1595 SYSCTL_DESCR("Maximum number of routes accepted via router advertisements"), 1596 NULL, 0, &ip6_rtadv_maxroutes, 0, 1597 CTL_NET, PF_INET6, IPPROTO_IPV6, 1598 IPV6CTL_RTADV_MAXROUTES, CTL_EOL); 1599 sysctl_createv(clog, 0, NULL, NULL, 1600 CTLFLAG_PERMANENT, 1601 CTLTYPE_INT, "rtadv_numroutes", 1602 SYSCTL_DESCR("Current number of routes accepted via router advertisements"), 1603 NULL, 0, &nd6_numroutes, 0, 1604 CTL_NET, PF_INET6, IPPROTO_IPV6, 1605 IPV6CTL_RTADV_NUMROUTES, CTL_EOL); 1606 sysctl_createv(clog, 0, NULL, NULL, 1607 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1608 CTLTYPE_INT, "keepfaith", 1609 SYSCTL_DESCR("Activate faith interface"), 1610 NULL, 0, &ip6_keepfaith, 0, 1611 CTL_NET, PF_INET6, IPPROTO_IPV6, 1612 IPV6CTL_KEEPFAITH, CTL_EOL); 1613 sysctl_createv(clog, 0, NULL, NULL, 1614 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1615 CTLTYPE_INT, "log_interval", 1616 SYSCTL_DESCR("Minimum interval between logging " 1617 "unroutable packets"), 1618 NULL, 0, &ip6_log_interval, 0, 1619 CTL_NET, PF_INET6, IPPROTO_IPV6, 1620 IPV6CTL_LOG_INTERVAL, CTL_EOL); 1621 sysctl_createv(clog, 0, NULL, NULL, 1622 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1623 CTLTYPE_INT, "hdrnestlimit", 1624 SYSCTL_DESCR("Maximum number of nested IPv6 headers"), 1625 NULL, 0, &ip6_hdrnestlimit, 0, 1626 CTL_NET, PF_INET6, IPPROTO_IPV6, 1627 IPV6CTL_HDRNESTLIMIT, CTL_EOL); 1628 sysctl_createv(clog, 0, NULL, NULL, 1629 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1630 CTLTYPE_INT, "dad_count", 1631 SYSCTL_DESCR("Number of Duplicate Address Detection " 1632 "probes to send"), 1633 NULL, 0, &ip6_dad_count, 0, 1634 CTL_NET, PF_INET6, IPPROTO_IPV6, 1635 IPV6CTL_DAD_COUNT, CTL_EOL); 1636 sysctl_createv(clog, 0, NULL, NULL, 1637 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1638 CTLTYPE_INT, "auto_flowlabel", 1639 SYSCTL_DESCR("Assign random IPv6 flow labels"), 1640 NULL, 0, &ip6_auto_flowlabel, 0, 1641 CTL_NET, PF_INET6, IPPROTO_IPV6, 1642 IPV6CTL_AUTO_FLOWLABEL, CTL_EOL); 1643 sysctl_createv(clog, 0, NULL, NULL, 1644 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1645 CTLTYPE_INT, "defmcasthlim", 1646 SYSCTL_DESCR("Default multicast hop limit"), 1647 NULL, 0, &ip6_defmcasthlim, 0, 1648 CTL_NET, PF_INET6, IPPROTO_IPV6, 1649 IPV6CTL_DEFMCASTHLIM, CTL_EOL); 1650 sysctl_createv(clog, 0, NULL, NULL, 1651 CTLFLAG_PERMANENT, 1652 CTLTYPE_STRING, "kame_version", 1653 SYSCTL_DESCR("KAME Version"), 1654 NULL, 0, __UNCONST(__KAME_VERSION), 0, 1655 CTL_NET, PF_INET6, IPPROTO_IPV6, 1656 IPV6CTL_KAME_VERSION, CTL_EOL); 1657 sysctl_createv(clog, 0, NULL, NULL, 1658 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1659 CTLTYPE_INT, "use_deprecated", 1660 SYSCTL_DESCR("Allow use of deprecated addresses as " 1661 "source addresses"), 1662 NULL, 0, &ip6_use_deprecated, 0, 1663 CTL_NET, PF_INET6, IPPROTO_IPV6, 1664 IPV6CTL_USE_DEPRECATED, CTL_EOL); 1665 sysctl_createv(clog, 0, NULL, NULL, 1666 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1667 CTLTYPE_INT, "rr_prune", NULL, 1668 NULL, 0, &ip6_rr_prune, 0, 1669 CTL_NET, PF_INET6, IPPROTO_IPV6, 1670 IPV6CTL_RR_PRUNE, CTL_EOL); 1671 sysctl_createv(clog, 0, NULL, NULL, 1672 CTLFLAG_PERMANENT 1673 #ifndef INET6_BINDV6ONLY 1674 |CTLFLAG_READWRITE, 1675 #endif 1676 CTLTYPE_INT, "v6only", 1677 SYSCTL_DESCR("Disallow PF_INET6 sockets from connecting " 1678 "to PF_INET sockets"), 1679 NULL, 0, &ip6_v6only, 0, 1680 CTL_NET, PF_INET6, IPPROTO_IPV6, 1681 IPV6CTL_V6ONLY, CTL_EOL); 1682 sysctl_createv(clog, 0, NULL, NULL, 1683 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1684 CTLTYPE_INT, "anonportmin", 1685 SYSCTL_DESCR("Lowest ephemeral port number to assign"), 1686 sysctl_net_inet_ip_ports, 0, &ip6_anonportmin, 0, 1687 CTL_NET, PF_INET6, IPPROTO_IPV6, 1688 IPV6CTL_ANONPORTMIN, CTL_EOL); 1689 sysctl_createv(clog, 0, NULL, NULL, 1690 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1691 CTLTYPE_INT, "anonportmax", 1692 SYSCTL_DESCR("Highest ephemeral port number to assign"), 1693 sysctl_net_inet_ip_ports, 0, &ip6_anonportmax, 0, 1694 CTL_NET, PF_INET6, IPPROTO_IPV6, 1695 IPV6CTL_ANONPORTMAX, CTL_EOL); 1696 #ifndef IPNOPRIVPORTS 1697 sysctl_createv(clog, 0, NULL, NULL, 1698 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1699 CTLTYPE_INT, "lowportmin", 1700 SYSCTL_DESCR("Lowest privileged ephemeral port number " 1701 "to assign"), 1702 sysctl_net_inet_ip_ports, 0, &ip6_lowportmin, 0, 1703 CTL_NET, PF_INET6, IPPROTO_IPV6, 1704 IPV6CTL_LOWPORTMIN, CTL_EOL); 1705 sysctl_createv(clog, 0, NULL, NULL, 1706 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1707 CTLTYPE_INT, "lowportmax", 1708 SYSCTL_DESCR("Highest privileged ephemeral port number " 1709 "to assign"), 1710 sysctl_net_inet_ip_ports, 0, &ip6_lowportmax, 0, 1711 CTL_NET, PF_INET6, IPPROTO_IPV6, 1712 IPV6CTL_LOWPORTMAX, CTL_EOL); 1713 #endif /* IPNOPRIVPORTS */ 1714 sysctl_createv(clog, 0, NULL, NULL, 1715 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1716 CTLTYPE_INT, "auto_linklocal", 1717 SYSCTL_DESCR("Default value of per-interface flag for " 1718 "adding an IPv6 link-local address to " 1719 "interfaces when attached"), 1720 NULL, 0, &ip6_auto_linklocal, 0, 1721 CTL_NET, PF_INET6, IPPROTO_IPV6, 1722 IPV6CTL_AUTO_LINKLOCAL, CTL_EOL); 1723 sysctl_createv(clog, 0, NULL, NULL, 1724 CTLFLAG_PERMANENT|CTLFLAG_READONLY, 1725 CTLTYPE_STRUCT, "addctlpolicy", 1726 SYSCTL_DESCR("Return the current address control" 1727 " policy"), 1728 sysctl_net_inet6_addrctlpolicy, 0, NULL, 0, 1729 CTL_NET, PF_INET6, IPPROTO_IPV6, 1730 IPV6CTL_ADDRCTLPOLICY, CTL_EOL); 1731 sysctl_createv(clog, 0, NULL, NULL, 1732 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1733 CTLTYPE_INT, "use_tempaddr", 1734 SYSCTL_DESCR("Use temporary address"), 1735 NULL, 0, &ip6_use_tempaddr, 0, 1736 CTL_NET, PF_INET6, IPPROTO_IPV6, 1737 CTL_CREATE, CTL_EOL); 1738 sysctl_createv(clog, 0, NULL, NULL, 1739 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1740 CTLTYPE_INT, "prefer_tempaddr", 1741 SYSCTL_DESCR("Prefer temporary address as source " 1742 "address"), 1743 NULL, 0, &ip6_prefer_tempaddr, 0, 1744 CTL_NET, PF_INET6, IPPROTO_IPV6, 1745 CTL_CREATE, CTL_EOL); 1746 sysctl_createv(clog, 0, NULL, NULL, 1747 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1748 CTLTYPE_INT, "temppltime", 1749 SYSCTL_DESCR("preferred lifetime of a temporary address"), 1750 NULL, 0, &ip6_temp_preferred_lifetime, 0, 1751 CTL_NET, PF_INET6, IPPROTO_IPV6, 1752 CTL_CREATE, CTL_EOL); 1753 sysctl_createv(clog, 0, NULL, NULL, 1754 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1755 CTLTYPE_INT, "tempvltime", 1756 SYSCTL_DESCR("valid lifetime of a temporary address"), 1757 NULL, 0, &ip6_temp_valid_lifetime, 0, 1758 CTL_NET, PF_INET6, IPPROTO_IPV6, 1759 CTL_CREATE, CTL_EOL); 1760 sysctl_createv(clog, 0, NULL, NULL, 1761 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1762 CTLTYPE_INT, "maxfrags", 1763 SYSCTL_DESCR("Maximum fragments in reassembly queue"), 1764 NULL, 0, &ip6_maxfrags, 0, 1765 CTL_NET, PF_INET6, IPPROTO_IPV6, 1766 IPV6CTL_MAXFRAGS, CTL_EOL); 1767 sysctl_createv(clog, 0, NULL, NULL, 1768 CTLFLAG_PERMANENT, 1769 CTLTYPE_STRUCT, "stats", 1770 SYSCTL_DESCR("IPv6 statistics"), 1771 sysctl_net_inet6_ip6_stats, 0, NULL, 0, 1772 CTL_NET, PF_INET6, IPPROTO_IPV6, 1773 IPV6CTL_STATS, CTL_EOL); 1774 sysctl_createv(clog, 0, NULL, NULL, 1775 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1776 CTLTYPE_INT, "use_defaultzone", 1777 SYSCTL_DESCR("Whether to use the default scope zones"), 1778 NULL, 0, &ip6_use_defzone, 0, 1779 CTL_NET, PF_INET6, IPPROTO_IPV6, 1780 IPV6CTL_USE_DEFAULTZONE, CTL_EOL); 1781 sysctl_createv(clog, 0, NULL, NULL, 1782 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1783 CTLTYPE_INT, "mcast_pmtu", 1784 SYSCTL_DESCR("Enable pMTU discovery for multicast packet"), 1785 NULL, 0, &ip6_mcast_pmtu, 0, 1786 CTL_NET, PF_INET6, IPPROTO_IPV6, 1787 CTL_CREATE, CTL_EOL); 1788 /* anonportalgo RFC6056 subtree */ 1789 const struct sysctlnode *portalgo_node; 1790 sysctl_createv(clog, 0, NULL, &portalgo_node, 1791 CTLFLAG_PERMANENT, 1792 CTLTYPE_NODE, "anonportalgo", 1793 SYSCTL_DESCR("Anonymous port algorithm selection (RFC 6056)"), 1794 NULL, 0, NULL, 0, 1795 CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_CREATE, CTL_EOL); 1796 sysctl_createv(clog, 0, &portalgo_node, NULL, 1797 CTLFLAG_PERMANENT, 1798 CTLTYPE_STRING, "available", 1799 SYSCTL_DESCR("available algorithms"), 1800 sysctl_portalgo_available, 0, NULL, PORTALGO_MAXLEN, 1801 CTL_CREATE, CTL_EOL); 1802 sysctl_createv(clog, 0, &portalgo_node, NULL, 1803 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1804 CTLTYPE_STRING, "selected", 1805 SYSCTL_DESCR("selected algorithm"), 1806 sysctl_portalgo_selected6, 0, NULL, PORTALGO_MAXLEN, 1807 CTL_CREATE, CTL_EOL); 1808 sysctl_createv(clog, 0, &portalgo_node, NULL, 1809 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1810 CTLTYPE_STRUCT, "reserve", 1811 SYSCTL_DESCR("bitmap of reserved ports"), 1812 sysctl_portalgo_reserve6, 0, NULL, 0, 1813 CTL_CREATE, CTL_EOL); 1814 sysctl_createv(clog, 0, NULL, NULL, 1815 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1816 CTLTYPE_INT, "neighborgcthresh", 1817 SYSCTL_DESCR("Maximum number of entries in neighbor" 1818 " cache"), 1819 NULL, 1, &ip6_neighborgcthresh, 0, 1820 CTL_NET, PF_INET6, IPPROTO_IPV6, 1821 CTL_CREATE, CTL_EOL); 1822 sysctl_createv(clog, 0, NULL, NULL, 1823 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1824 CTLTYPE_INT, "maxifprefixes", 1825 SYSCTL_DESCR("Maximum number of prefixes created by" 1826 " route advertisement per interface"), 1827 NULL, 1, &ip6_maxifprefixes, 0, 1828 CTL_NET, PF_INET6, IPPROTO_IPV6, 1829 CTL_CREATE, CTL_EOL); 1830 sysctl_createv(clog, 0, NULL, NULL, 1831 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1832 CTLTYPE_INT, "maxifdefrouters", 1833 SYSCTL_DESCR("Maximum number of default routers created" 1834 " by route advertisement per interface"), 1835 NULL, 1, &ip6_maxifdefrouters, 0, 1836 CTL_NET, PF_INET6, IPPROTO_IPV6, 1837 CTL_CREATE, CTL_EOL); 1838 sysctl_createv(clog, 0, NULL, NULL, 1839 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1840 CTLTYPE_INT, "maxdynroutes", 1841 SYSCTL_DESCR("Maximum number of routes created via" 1842 " redirect"), 1843 NULL, 1, &ip6_maxdynroutes, 0, 1844 CTL_NET, PF_INET6, IPPROTO_IPV6, 1845 CTL_CREATE, CTL_EOL); 1846 } 1847 1848 void 1849 ip6_statinc(u_int stat) 1850 { 1851 1852 KASSERT(stat < IP6_NSTATS); 1853 IP6_STATINC(stat); 1854 } 1855
Indexes created Tue Sep 23 14:10:03 GMT 2025