1 /* $NetBSD: ip6_input.c,v 1.154 2016/01/08 03:55:39 knakahara 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 1.154 2016/01/08 03:55:39 knakahara 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_compat_netbsd.h" 73 #endif 74 75 #include <sys/param.h> 76 #include <sys/systm.h> 77 #include <sys/malloc.h> 78 #include <sys/mbuf.h> 79 #include <sys/domain.h> 80 #include <sys/protosw.h> 81 #include <sys/socket.h> 82 #include <sys/socketvar.h> 83 #include <sys/errno.h> 84 #include <sys/time.h> 85 #include <sys/kernel.h> 86 #include <sys/syslog.h> 87 #include <sys/proc.h> 88 #include <sys/sysctl.h> 89 #include <sys/cprng.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 #ifdef COMPAT_50 123 #include <compat/sys/time.h> 124 #include <compat/sys/socket.h> 125 #endif 126 127 #include <netinet6/ip6protosw.h> 128 129 #include "faith.h" 130 131 #include <net/net_osdep.h> 132 133 extern struct domain inet6domain; 134 135 u_char ip6_protox[IPPROTO_MAX]; 136 struct in6_ifaddr *in6_ifaddr; 137 pktqueue_t *ip6_pktq __read_mostly; 138 139 extern callout_t in6_tmpaddrtimer_ch; 140 141 int ip6_forward_srcrt; /* XXX */ 142 int ip6_sourcecheck; /* XXX */ 143 int ip6_sourcecheck_interval; /* XXX */ 144 145 pfil_head_t *inet6_pfil_hook; 146 147 percpu_t *ip6stat_percpu; 148 149 static void ip6_init2(void *); 150 static void ip6intr(void *); 151 static struct m_tag *ip6_setdstifaddr(struct mbuf *, const struct in6_ifaddr *); 152 153 static int ip6_process_hopopts(struct mbuf *, u_int8_t *, int, u_int32_t *, 154 u_int32_t *); 155 static struct mbuf *ip6_pullexthdr(struct mbuf *, size_t, int); 156 static void sysctl_net_inet6_ip6_setup(struct sysctllog **); 157 158 /* 159 * IP6 initialization: fill in IP6 protocol switch table. 160 * All protocols not implemented in kernel go to raw IP6 protocol handler. 161 */ 162 void 163 ip6_init(void) 164 { 165 const struct ip6protosw *pr; 166 int i; 167 168 sysctl_net_inet6_ip6_setup(NULL); 169 pr = (const struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 170 if (pr == 0) 171 panic("ip6_init"); 172 for (i = 0; i < IPPROTO_MAX; i++) 173 ip6_protox[i] = pr - inet6sw; 174 for (pr = (const struct ip6protosw *)inet6domain.dom_protosw; 175 pr < (const struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++) 176 if (pr->pr_domain->dom_family == PF_INET6 && 177 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) 178 ip6_protox[pr->pr_protocol] = pr - inet6sw; 179 180 ip6_pktq = pktq_create(IFQ_MAXLEN, ip6intr, NULL); 181 KASSERT(ip6_pktq != NULL); 182 183 scope6_init(); 184 addrsel_policy_init(); 185 nd6_init(); 186 frag6_init(); 187 ip6_desync_factor = cprng_fast32() % MAX_TEMP_DESYNC_FACTOR; 188 189 ip6_init2(NULL); 190 #ifdef GATEWAY 191 ip6flow_init(ip6_hashsize); 192 #endif 193 /* Register our Packet Filter hook. */ 194 inet6_pfil_hook = pfil_head_create(PFIL_TYPE_AF, (void *)AF_INET6); 195 KASSERT(inet6_pfil_hook != NULL); 196 197 ip6stat_percpu = percpu_alloc(sizeof(uint64_t) * IP6_NSTATS); 198 } 199 200 static void 201 ip6_init2(void *dummy) 202 { 203 204 /* nd6_timer_init */ 205 callout_init(&nd6_timer_ch, CALLOUT_MPSAFE); 206 callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL); 207 208 /* timer for regeneranation of temporary addresses randomize ID */ 209 callout_init(&in6_tmpaddrtimer_ch, CALLOUT_MPSAFE); 210 callout_reset(&in6_tmpaddrtimer_ch, 211 (ip6_temp_preferred_lifetime - ip6_desync_factor - 212 ip6_temp_regen_advance) * hz, 213 in6_tmpaddrtimer, NULL); 214 } 215 216 /* 217 * IP6 input interrupt handling. Just pass the packet to ip6_input. 218 */ 219 static void 220 ip6intr(void *arg __unused) 221 { 222 struct mbuf *m; 223 224 mutex_enter(softnet_lock); 225 while ((m = pktq_dequeue(ip6_pktq)) != NULL) { 226 const ifnet_t *ifp = m->m_pkthdr.rcvif; 227 228 /* 229 * Drop the packet if IPv6 is disabled on the interface. 230 */ 231 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)) { 232 m_freem(m); 233 continue; 234 } 235 ip6_input(m); 236 } 237 mutex_exit(softnet_lock); 238 } 239 240 extern struct route ip6_forward_rt; 241 242 void 243 ip6_input(struct mbuf *m) 244 { 245 struct ip6_hdr *ip6; 246 int hit, off = sizeof(struct ip6_hdr), nest; 247 u_int32_t plen; 248 u_int32_t rtalert = ~0; 249 int nxt, ours = 0, rh_present = 0; 250 struct ifnet *deliverifp = NULL; 251 int srcrt = 0; 252 const struct rtentry *rt; 253 union { 254 struct sockaddr dst; 255 struct sockaddr_in6 dst6; 256 } u; 257 258 /* 259 * make sure we don't have onion peering information into m_tag. 260 */ 261 ip6_delaux(m); 262 263 /* 264 * mbuf statistics 265 */ 266 if (m->m_flags & M_EXT) { 267 if (m->m_next) 268 IP6_STATINC(IP6_STAT_MEXT2M); 269 else 270 IP6_STATINC(IP6_STAT_MEXT1); 271 } else { 272 #define M2MMAX 32 273 if (m->m_next) { 274 if (m->m_flags & M_LOOP) { 275 /*XXX*/ IP6_STATINC(IP6_STAT_M2M + lo0ifp->if_index); 276 } else if (m->m_pkthdr.rcvif->if_index < M2MMAX) { 277 IP6_STATINC(IP6_STAT_M2M + 278 m->m_pkthdr.rcvif->if_index); 279 } else 280 IP6_STATINC(IP6_STAT_M2M); 281 } else 282 IP6_STATINC(IP6_STAT_M1); 283 #undef M2MMAX 284 } 285 286 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive); 287 IP6_STATINC(IP6_STAT_TOTAL); 288 289 /* 290 * If the IPv6 header is not aligned, slurp it up into a new 291 * mbuf with space for link headers, in the event we forward 292 * it. Otherwise, if it is aligned, make sure the entire base 293 * IPv6 header is in the first mbuf of the chain. 294 */ 295 if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 296 struct ifnet *inifp = m->m_pkthdr.rcvif; 297 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 298 (max_linkhdr + 3) & ~3)) == NULL) { 299 /* XXXJRT new stat, please */ 300 IP6_STATINC(IP6_STAT_TOOSMALL); 301 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 302 return; 303 } 304 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 305 struct ifnet *inifp = m->m_pkthdr.rcvif; 306 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 307 IP6_STATINC(IP6_STAT_TOOSMALL); 308 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 309 return; 310 } 311 } 312 313 ip6 = mtod(m, struct ip6_hdr *); 314 315 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 316 IP6_STATINC(IP6_STAT_BADVERS); 317 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 318 goto bad; 319 } 320 321 /* 322 * Assume that we can create a fast-forward IP flow entry 323 * based on this packet. 324 */ 325 m->m_flags |= M_CANFASTFWD; 326 327 /* 328 * Run through list of hooks for input packets. If there are any 329 * filters which require that additional packets in the flow are 330 * not fast-forwarded, they must clear the M_CANFASTFWD flag. 331 * Note that filters must _never_ set this flag, as another filter 332 * in the list may have previously cleared it. 333 */ 334 /* 335 * let ipfilter look at packet on the wire, 336 * not the decapsulated packet. 337 */ 338 #if defined(IPSEC) 339 if (!ipsec_used || !ipsec_indone(m)) 340 #else 341 if (1) 342 #endif 343 { 344 struct in6_addr odst; 345 346 odst = ip6->ip6_dst; 347 if (pfil_run_hooks(inet6_pfil_hook, &m, m->m_pkthdr.rcvif, 348 PFIL_IN) != 0) 349 return; 350 if (m == NULL) 351 return; 352 ip6 = mtod(m, struct ip6_hdr *); 353 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst); 354 } 355 356 IP6_STATINC(IP6_STAT_NXTHIST + ip6->ip6_nxt); 357 358 #ifdef ALTQ 359 if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) { 360 /* packet is dropped by traffic conditioner */ 361 return; 362 } 363 #endif 364 365 /* 366 * Check against address spoofing/corruption. 367 */ 368 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) || 369 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) { 370 /* 371 * XXX: "badscope" is not very suitable for a multicast source. 372 */ 373 IP6_STATINC(IP6_STAT_BADSCOPE); 374 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 375 goto bad; 376 } 377 /* 378 * The following check is not documented in specs. A malicious 379 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack 380 * and bypass security checks (act as if it was from 127.0.0.1 by using 381 * IPv6 src ::ffff:127.0.0.1). Be cautious. 382 * 383 * This check chokes if we are in an SIIT cloud. As none of BSDs 384 * support IPv4-less kernel compilation, we cannot support SIIT 385 * environment at all. So, it makes more sense for us to reject any 386 * malicious packets for non-SIIT environment, than try to do a 387 * partial support for SIIT environment. 388 */ 389 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 390 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 391 IP6_STATINC(IP6_STAT_BADSCOPE); 392 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 393 goto bad; 394 } 395 #if 0 396 /* 397 * Reject packets with IPv4 compatible addresses (auto tunnel). 398 * 399 * The code forbids auto tunnel relay case in RFC1933 (the check is 400 * stronger than RFC1933). We may want to re-enable it if mech-xx 401 * is revised to forbid relaying case. 402 */ 403 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) || 404 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) { 405 IP6_STATINC(IP6_STAT_BADSCOPE); 406 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 407 goto bad; 408 } 409 #endif 410 411 /* 412 * Disambiguate address scope zones (if there is ambiguity). 413 * We first make sure that the original source or destination address 414 * is not in our internal form for scoped addresses. Such addresses 415 * are not necessarily invalid spec-wise, but we cannot accept them due 416 * to the usage conflict. 417 * in6_setscope() then also checks and rejects the cases where src or 418 * dst are the loopback address and the receiving interface 419 * is not loopback. 420 */ 421 if (__predict_false( 422 m_makewritable(&m, 0, sizeof(struct ip6_hdr), M_DONTWAIT))) 423 goto bad; 424 ip6 = mtod(m, struct ip6_hdr *); 425 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) { 426 IP6_STATINC(IP6_STAT_BADSCOPE); /* XXX */ 427 goto bad; 428 } 429 if (in6_setscope(&ip6->ip6_src, m->m_pkthdr.rcvif, NULL) || 430 in6_setscope(&ip6->ip6_dst, m->m_pkthdr.rcvif, NULL)) { 431 IP6_STATINC(IP6_STAT_BADSCOPE); 432 goto bad; 433 } 434 435 /* 436 * Multicast check 437 */ 438 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 439 struct in6_multi *in6m = 0; 440 441 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast); 442 /* 443 * See if we belong to the destination multicast group on the 444 * arrival interface. 445 */ 446 IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m); 447 if (in6m) 448 ours = 1; 449 else if (!ip6_mrouter) { 450 uint64_t *ip6s = IP6_STAT_GETREF(); 451 ip6s[IP6_STAT_NOTMEMBER]++; 452 ip6s[IP6_STAT_CANTFORWARD]++; 453 IP6_STAT_PUTREF(); 454 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 455 goto bad; 456 } 457 deliverifp = m->m_pkthdr.rcvif; 458 goto hbhcheck; 459 } 460 461 sockaddr_in6_init(&u.dst6, &ip6->ip6_dst, 0, 0, 0); 462 463 /* 464 * Unicast check 465 */ 466 rt = rtcache_lookup2(&ip6_forward_rt, &u.dst, 1, &hit); 467 if (hit) 468 IP6_STATINC(IP6_STAT_FORWARD_CACHEHIT); 469 else 470 IP6_STATINC(IP6_STAT_FORWARD_CACHEMISS); 471 472 #define rt6_getkey(__rt) satocsin6(rt_getkey(__rt)) 473 474 /* 475 * Accept the packet if the forwarding interface to the destination 476 * according to the routing table is the loopback interface, 477 * unless the associated route has a gateway. 478 * Note that this approach causes to accept a packet if there is a 479 * route to the loopback interface for the destination of the packet. 480 * But we think it's even useful in some situations, e.g. when using 481 * a special daemon which wants to intercept the packet. 482 */ 483 if (rt != NULL && 484 (rt->rt_flags & (RTF_HOST|RTF_GATEWAY)) == RTF_HOST && 485 !(rt->rt_flags & RTF_CLONED) && 486 #if 0 487 /* 488 * The check below is redundant since the comparison of 489 * the destination and the key of the rtentry has 490 * already done through looking up the routing table. 491 */ 492 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &rt6_getkey(rt)->sin6_addr) && 493 #endif 494 rt->rt_ifp->if_type == IFT_LOOP) { 495 struct in6_ifaddr *ia6 = (struct in6_ifaddr *)rt->rt_ifa; 496 if (ia6->ia6_flags & IN6_IFF_ANYCAST) 497 m->m_flags |= M_ANYCAST6; 498 /* 499 * packets to a tentative, duplicated, or somehow invalid 500 * address must not be accepted. 501 */ 502 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) { 503 /* this address is ready */ 504 ours = 1; 505 deliverifp = ia6->ia_ifp; /* correct? */ 506 goto hbhcheck; 507 } else { 508 /* address is not ready, so discard the packet. */ 509 nd6log((LOG_INFO, 510 "ip6_input: packet to an unready address %s->%s\n", 511 ip6_sprintf(&ip6->ip6_src), 512 ip6_sprintf(&ip6->ip6_dst))); 513 514 goto bad; 515 } 516 } 517 518 /* 519 * FAITH (Firewall Aided Internet Translator) 520 */ 521 #if defined(NFAITH) && 0 < NFAITH 522 if (ip6_keepfaith) { 523 if (rt != NULL && rt->rt_ifp != NULL && 524 rt->rt_ifp->if_type == IFT_FAITH) { 525 /* XXX do we need more sanity checks? */ 526 ours = 1; 527 deliverifp = rt->rt_ifp; /* faith */ 528 goto hbhcheck; 529 } 530 } 531 #endif 532 533 #if 0 534 { 535 /* 536 * Last resort: check in6_ifaddr for incoming interface. 537 * The code is here until I update the "goto ours hack" code above 538 * working right. 539 */ 540 struct ifaddr *ifa; 541 IFADDR_FOREACH(ifa, m->m_pkthdr.rcvif) { 542 if (ifa->ifa_addr == NULL) 543 continue; /* just for safety */ 544 if (ifa->ifa_addr->sa_family != AF_INET6) 545 continue; 546 if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) { 547 ours = 1; 548 deliverifp = ifa->ifa_ifp; 549 goto hbhcheck; 550 } 551 } 552 } 553 #endif 554 555 /* 556 * Now there is no reason to process the packet if it's not our own 557 * and we're not a router. 558 */ 559 if (!ip6_forwarding) { 560 IP6_STATINC(IP6_STAT_CANTFORWARD); 561 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 562 goto bad; 563 } 564 565 hbhcheck: 566 /* 567 * record address information into m_tag, if we don't have one yet. 568 * note that we are unable to record it, if the address is not listed 569 * as our interface address (e.g. multicast addresses, addresses 570 * within FAITH prefixes and such). 571 */ 572 if (deliverifp && ip6_getdstifaddr(m) == NULL) { 573 struct in6_ifaddr *ia6; 574 575 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 576 if (ia6 != NULL && ip6_setdstifaddr(m, ia6) == NULL) { 577 /* 578 * XXX maybe we should drop the packet here, 579 * as we could not provide enough information 580 * to the upper layers. 581 */ 582 } 583 } 584 585 /* 586 * Process Hop-by-Hop options header if it's contained. 587 * m may be modified in ip6_hopopts_input(). 588 * If a JumboPayload option is included, plen will also be modified. 589 */ 590 plen = (u_int32_t)ntohs(ip6->ip6_plen); 591 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 592 struct ip6_hbh *hbh; 593 594 if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) { 595 #if 0 /*touches NULL pointer*/ 596 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 597 #endif 598 return; /* m have already been freed */ 599 } 600 601 /* adjust pointer */ 602 ip6 = mtod(m, struct ip6_hdr *); 603 604 /* 605 * if the payload length field is 0 and the next header field 606 * indicates Hop-by-Hop Options header, then a Jumbo Payload 607 * option MUST be included. 608 */ 609 if (ip6->ip6_plen == 0 && plen == 0) { 610 /* 611 * Note that if a valid jumbo payload option is 612 * contained, ip6_hopopts_input() must set a valid 613 * (non-zero) payload length to the variable plen. 614 */ 615 IP6_STATINC(IP6_STAT_BADOPTIONS); 616 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 617 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 618 icmp6_error(m, ICMP6_PARAM_PROB, 619 ICMP6_PARAMPROB_HEADER, 620 (char *)&ip6->ip6_plen - (char *)ip6); 621 return; 622 } 623 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 624 sizeof(struct ip6_hbh)); 625 if (hbh == NULL) { 626 IP6_STATINC(IP6_STAT_TOOSHORT); 627 return; 628 } 629 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 630 nxt = hbh->ip6h_nxt; 631 632 /* 633 * accept the packet if a router alert option is included 634 * and we act as an IPv6 router. 635 */ 636 if (rtalert != ~0 && ip6_forwarding) 637 ours = 1; 638 } else 639 nxt = ip6->ip6_nxt; 640 641 /* 642 * Check that the amount of data in the buffers 643 * is as at least much as the IPv6 header would have us expect. 644 * Trim mbufs if longer than we expect. 645 * Drop packet if shorter than we expect. 646 */ 647 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 648 IP6_STATINC(IP6_STAT_TOOSHORT); 649 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 650 goto bad; 651 } 652 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 653 if (m->m_len == m->m_pkthdr.len) { 654 m->m_len = sizeof(struct ip6_hdr) + plen; 655 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 656 } else 657 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 658 } 659 660 /* 661 * Forward if desirable. 662 */ 663 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 664 /* 665 * If we are acting as a multicast router, all 666 * incoming multicast packets are passed to the 667 * kernel-level multicast forwarding function. 668 * The packet is returned (relatively) intact; if 669 * ip6_mforward() returns a non-zero value, the packet 670 * must be discarded, else it may be accepted below. 671 */ 672 if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) { 673 IP6_STATINC(IP6_STAT_CANTFORWARD); 674 m_freem(m); 675 return; 676 } 677 if (!ours) { 678 m_freem(m); 679 return; 680 } 681 } else if (!ours) { 682 ip6_forward(m, srcrt); 683 return; 684 } 685 686 ip6 = mtod(m, struct ip6_hdr *); 687 688 /* 689 * Malicious party may be able to use IPv4 mapped addr to confuse 690 * tcp/udp stack and bypass security checks (act as if it was from 691 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious. 692 * 693 * For SIIT end node behavior, you may want to disable the check. 694 * However, you will become vulnerable to attacks using IPv4 mapped 695 * source. 696 */ 697 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 698 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 699 IP6_STATINC(IP6_STAT_BADSCOPE); 700 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 701 goto bad; 702 } 703 704 /* 705 * Tell launch routine the next header 706 */ 707 #ifdef IFA_STATS 708 if (deliverifp != NULL) { 709 struct in6_ifaddr *ia6; 710 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 711 if (ia6) 712 ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len; 713 } 714 #endif 715 IP6_STATINC(IP6_STAT_DELIVERED); 716 in6_ifstat_inc(deliverifp, ifs6_in_deliver); 717 nest = 0; 718 719 rh_present = 0; 720 while (nxt != IPPROTO_DONE) { 721 if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) { 722 IP6_STATINC(IP6_STAT_TOOMANYHDR); 723 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 724 goto bad; 725 } 726 727 /* 728 * protection against faulty packet - there should be 729 * more sanity checks in header chain processing. 730 */ 731 if (m->m_pkthdr.len < off) { 732 IP6_STATINC(IP6_STAT_TOOSHORT); 733 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 734 goto bad; 735 } 736 737 if (nxt == IPPROTO_ROUTING) { 738 if (rh_present++) { 739 in6_ifstat_inc(m->m_pkthdr.rcvif, 740 ifs6_in_hdrerr); 741 IP6_STATINC(IP6_STAT_BADOPTIONS); 742 goto bad; 743 } 744 } 745 746 #ifdef IPSEC 747 if (ipsec_used) { 748 /* 749 * enforce IPsec policy checking if we are seeing last 750 * header. note that we do not visit this with 751 * protocols with pcb layer code - like udp/tcp/raw ip. 752 */ 753 if ((inet6sw[ip_protox[nxt]].pr_flags 754 & PR_LASTHDR) != 0) { 755 int error = ipsec6_input(m); 756 if (error) 757 goto bad; 758 } 759 } 760 #endif /* IPSEC */ 761 762 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt); 763 } 764 return; 765 bad: 766 m_freem(m); 767 } 768 769 /* 770 * set/grab in6_ifaddr correspond to IPv6 destination address. 771 */ 772 static struct m_tag * 773 ip6_setdstifaddr(struct mbuf *m, const struct in6_ifaddr *ia) 774 { 775 struct m_tag *mtag; 776 struct ip6aux *ip6a; 777 778 mtag = ip6_addaux(m); 779 if (mtag == NULL) 780 return NULL; 781 782 ip6a = (struct ip6aux *)(mtag + 1); 783 if (in6_setscope(&ip6a->ip6a_src, ia->ia_ifp, &ip6a->ip6a_scope_id)) { 784 IP6_STATINC(IP6_STAT_BADSCOPE); 785 return NULL; 786 } 787 788 ip6a->ip6a_src = ia->ia_addr.sin6_addr; 789 ip6a->ip6a_flags = ia->ia6_flags; 790 return mtag; 791 } 792 793 const struct ip6aux * 794 ip6_getdstifaddr(struct mbuf *m) 795 { 796 struct m_tag *mtag; 797 798 mtag = ip6_findaux(m); 799 if (mtag != NULL) 800 return (struct ip6aux *)(mtag + 1); 801 else 802 return NULL; 803 } 804 805 /* 806 * Hop-by-Hop options header processing. If a valid jumbo payload option is 807 * included, the real payload length will be stored in plenp. 808 * 809 * rtalertp - XXX: should be stored more smart way 810 */ 811 int 812 ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp, 813 struct mbuf **mp, int *offp) 814 { 815 struct mbuf *m = *mp; 816 int off = *offp, hbhlen; 817 struct ip6_hbh *hbh; 818 819 /* validation of the length of the header */ 820 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, 821 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh)); 822 if (hbh == NULL) { 823 IP6_STATINC(IP6_STAT_TOOSHORT); 824 return -1; 825 } 826 hbhlen = (hbh->ip6h_len + 1) << 3; 827 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 828 hbhlen); 829 if (hbh == NULL) { 830 IP6_STATINC(IP6_STAT_TOOSHORT); 831 return -1; 832 } 833 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 834 off += hbhlen; 835 hbhlen -= sizeof(struct ip6_hbh); 836 837 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 838 hbhlen, rtalertp, plenp) < 0) 839 return (-1); 840 841 *offp = off; 842 *mp = m; 843 return (0); 844 } 845 846 /* 847 * Search header for all Hop-by-hop options and process each option. 848 * This function is separate from ip6_hopopts_input() in order to 849 * handle a case where the sending node itself process its hop-by-hop 850 * options header. In such a case, the function is called from ip6_output(). 851 * 852 * The function assumes that hbh header is located right after the IPv6 header 853 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to 854 * opthead + hbhlen is located in continuous memory region. 855 */ 856 static int 857 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen, 858 u_int32_t *rtalertp, u_int32_t *plenp) 859 { 860 struct ip6_hdr *ip6; 861 int optlen = 0; 862 u_int8_t *opt = opthead; 863 u_int16_t rtalert_val; 864 u_int32_t jumboplen; 865 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh); 866 867 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 868 switch (*opt) { 869 case IP6OPT_PAD1: 870 optlen = 1; 871 break; 872 case IP6OPT_PADN: 873 if (hbhlen < IP6OPT_MINLEN) { 874 IP6_STATINC(IP6_STAT_TOOSMALL); 875 goto bad; 876 } 877 optlen = *(opt + 1) + 2; 878 break; 879 case IP6OPT_RTALERT: 880 /* XXX may need check for alignment */ 881 if (hbhlen < IP6OPT_RTALERT_LEN) { 882 IP6_STATINC(IP6_STAT_TOOSMALL); 883 goto bad; 884 } 885 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) { 886 /* XXX stat */ 887 icmp6_error(m, ICMP6_PARAM_PROB, 888 ICMP6_PARAMPROB_HEADER, 889 erroff + opt + 1 - opthead); 890 return (-1); 891 } 892 optlen = IP6OPT_RTALERT_LEN; 893 memcpy((void *)&rtalert_val, (void *)(opt + 2), 2); 894 *rtalertp = ntohs(rtalert_val); 895 break; 896 case IP6OPT_JUMBO: 897 /* XXX may need check for alignment */ 898 if (hbhlen < IP6OPT_JUMBO_LEN) { 899 IP6_STATINC(IP6_STAT_TOOSMALL); 900 goto bad; 901 } 902 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) { 903 /* XXX stat */ 904 icmp6_error(m, ICMP6_PARAM_PROB, 905 ICMP6_PARAMPROB_HEADER, 906 erroff + opt + 1 - opthead); 907 return (-1); 908 } 909 optlen = IP6OPT_JUMBO_LEN; 910 911 /* 912 * IPv6 packets that have non 0 payload length 913 * must not contain a jumbo payload option. 914 */ 915 ip6 = mtod(m, struct ip6_hdr *); 916 if (ip6->ip6_plen) { 917 IP6_STATINC(IP6_STAT_BADOPTIONS); 918 icmp6_error(m, ICMP6_PARAM_PROB, 919 ICMP6_PARAMPROB_HEADER, 920 erroff + opt - opthead); 921 return (-1); 922 } 923 924 /* 925 * We may see jumbolen in unaligned location, so 926 * we'd need to perform bcopy(). 927 */ 928 memcpy(&jumboplen, opt + 2, sizeof(jumboplen)); 929 jumboplen = (u_int32_t)htonl(jumboplen); 930 931 #if 1 932 /* 933 * if there are multiple jumbo payload options, 934 * *plenp will be non-zero and the packet will be 935 * rejected. 936 * the behavior may need some debate in ipngwg - 937 * multiple options does not make sense, however, 938 * there's no explicit mention in specification. 939 */ 940 if (*plenp != 0) { 941 IP6_STATINC(IP6_STAT_BADOPTIONS); 942 icmp6_error(m, ICMP6_PARAM_PROB, 943 ICMP6_PARAMPROB_HEADER, 944 erroff + opt + 2 - opthead); 945 return (-1); 946 } 947 #endif 948 949 /* 950 * jumbo payload length must be larger than 65535. 951 */ 952 if (jumboplen <= IPV6_MAXPACKET) { 953 IP6_STATINC(IP6_STAT_BADOPTIONS); 954 icmp6_error(m, ICMP6_PARAM_PROB, 955 ICMP6_PARAMPROB_HEADER, 956 erroff + opt + 2 - opthead); 957 return (-1); 958 } 959 *plenp = jumboplen; 960 961 break; 962 default: /* unknown option */ 963 if (hbhlen < IP6OPT_MINLEN) { 964 IP6_STATINC(IP6_STAT_TOOSMALL); 965 goto bad; 966 } 967 optlen = ip6_unknown_opt(opt, m, 968 erroff + opt - opthead); 969 if (optlen == -1) 970 return (-1); 971 optlen += 2; 972 break; 973 } 974 } 975 976 return (0); 977 978 bad: 979 m_freem(m); 980 return (-1); 981 } 982 983 /* 984 * Unknown option processing. 985 * The third argument `off' is the offset from the IPv6 header to the option, 986 * which is necessary if the IPv6 header the and option header and IPv6 header 987 * is not continuous in order to return an ICMPv6 error. 988 */ 989 int 990 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off) 991 { 992 struct ip6_hdr *ip6; 993 994 switch (IP6OPT_TYPE(*optp)) { 995 case IP6OPT_TYPE_SKIP: /* ignore the option */ 996 return ((int)*(optp + 1)); 997 case IP6OPT_TYPE_DISCARD: /* silently discard */ 998 m_freem(m); 999 return (-1); 1000 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 1001 IP6_STATINC(IP6_STAT_BADOPTIONS); 1002 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 1003 return (-1); 1004 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 1005 IP6_STATINC(IP6_STAT_BADOPTIONS); 1006 ip6 = mtod(m, struct ip6_hdr *); 1007 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 1008 (m->m_flags & (M_BCAST|M_MCAST))) 1009 m_freem(m); 1010 else 1011 icmp6_error(m, ICMP6_PARAM_PROB, 1012 ICMP6_PARAMPROB_OPTION, off); 1013 return (-1); 1014 } 1015 1016 m_freem(m); /* XXX: NOTREACHED */ 1017 return (-1); 1018 } 1019 1020 /* 1021 * Create the "control" list for this pcb. 1022 * 1023 * The routine will be called from upper layer handlers like tcp6_input(). 1024 * Thus the routine assumes that the caller (tcp6_input) have already 1025 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the 1026 * very first mbuf on the mbuf chain. 1027 * We may want to add some infinite loop prevention or sanity checks for safety. 1028 * (This applies only when you are using KAME mbuf chain restriction, i.e. 1029 * you are using IP6_EXTHDR_CHECK() not m_pulldown()) 1030 */ 1031 void 1032 ip6_savecontrol(struct in6pcb *in6p, struct mbuf **mp, 1033 struct ip6_hdr *ip6, struct mbuf *m) 1034 { 1035 #ifdef RFC2292 1036 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y)) 1037 #else 1038 #define IS2292(x, y) (y) 1039 #endif 1040 1041 if (in6p->in6p_socket->so_options & SO_TIMESTAMP 1042 #ifdef SO_OTIMESTAMP 1043 || in6p->in6p_socket->so_options & SO_OTIMESTAMP 1044 #endif 1045 ) { 1046 struct timeval tv; 1047 1048 microtime(&tv); 1049 #ifdef SO_OTIMESTAMP 1050 if (in6p->in6p_socket->so_options & SO_OTIMESTAMP) { 1051 struct timeval50 tv50; 1052 timeval_to_timeval50(&tv, &tv50); 1053 *mp = sbcreatecontrol((void *) &tv50, sizeof(tv50), 1054 SCM_OTIMESTAMP, SOL_SOCKET); 1055 } else 1056 #endif 1057 *mp = sbcreatecontrol((void *) &tv, sizeof(tv), 1058 SCM_TIMESTAMP, SOL_SOCKET); 1059 if (*mp) 1060 mp = &(*mp)->m_next; 1061 } 1062 1063 /* some OSes call this logic with IPv4 packet, for SO_TIMESTAMP */ 1064 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) 1065 return; 1066 1067 /* RFC 2292 sec. 5 */ 1068 if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) { 1069 struct in6_pktinfo pi6; 1070 1071 memcpy(&pi6.ipi6_addr, &ip6->ip6_dst, sizeof(struct in6_addr)); 1072 in6_clearscope(&pi6.ipi6_addr); /* XXX */ 1073 pi6.ipi6_ifindex = m->m_pkthdr.rcvif ? 1074 m->m_pkthdr.rcvif->if_index : 0; 1075 *mp = sbcreatecontrol((void *) &pi6, 1076 sizeof(struct in6_pktinfo), 1077 IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6); 1078 if (*mp) 1079 mp = &(*mp)->m_next; 1080 } 1081 1082 if (in6p->in6p_flags & IN6P_HOPLIMIT) { 1083 int hlim = ip6->ip6_hlim & 0xff; 1084 1085 *mp = sbcreatecontrol((void *) &hlim, sizeof(int), 1086 IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6); 1087 if (*mp) 1088 mp = &(*mp)->m_next; 1089 } 1090 1091 if ((in6p->in6p_flags & IN6P_TCLASS) != 0) { 1092 u_int32_t flowinfo; 1093 int tclass; 1094 1095 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK); 1096 flowinfo >>= 20; 1097 1098 tclass = flowinfo & 0xff; 1099 *mp = sbcreatecontrol((void *)&tclass, sizeof(tclass), 1100 IPV6_TCLASS, IPPROTO_IPV6); 1101 1102 if (*mp) 1103 mp = &(*mp)->m_next; 1104 } 1105 1106 /* 1107 * IPV6_HOPOPTS socket option. Recall that we required super-user 1108 * privilege for the option (see ip6_ctloutput), but it might be too 1109 * strict, since there might be some hop-by-hop options which can be 1110 * returned to normal user. 1111 * See also RFC3542 section 8 (or RFC2292 section 6). 1112 */ 1113 if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0) { 1114 /* 1115 * Check if a hop-by-hop options header is contatined in the 1116 * received packet, and if so, store the options as ancillary 1117 * data. Note that a hop-by-hop options header must be 1118 * just after the IPv6 header, which fact is assured through 1119 * the IPv6 input processing. 1120 */ 1121 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1122 if (xip6->ip6_nxt == IPPROTO_HOPOPTS) { 1123 struct ip6_hbh *hbh; 1124 int hbhlen; 1125 struct mbuf *ext; 1126 1127 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr), 1128 xip6->ip6_nxt); 1129 if (ext == NULL) { 1130 IP6_STATINC(IP6_STAT_TOOSHORT); 1131 return; 1132 } 1133 hbh = mtod(ext, struct ip6_hbh *); 1134 hbhlen = (hbh->ip6h_len + 1) << 3; 1135 if (hbhlen != ext->m_len) { 1136 m_freem(ext); 1137 IP6_STATINC(IP6_STAT_TOOSHORT); 1138 return; 1139 } 1140 1141 /* 1142 * XXX: We copy whole the header even if a jumbo 1143 * payload option is included, which option is to 1144 * be removed before returning in the RFC 2292. 1145 * Note: this constraint is removed in RFC3542. 1146 */ 1147 *mp = sbcreatecontrol((void *)hbh, hbhlen, 1148 IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS), 1149 IPPROTO_IPV6); 1150 if (*mp) 1151 mp = &(*mp)->m_next; 1152 m_freem(ext); 1153 } 1154 } 1155 1156 /* IPV6_DSTOPTS and IPV6_RTHDR socket options */ 1157 if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) { 1158 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1159 int nxt = xip6->ip6_nxt, off = sizeof(struct ip6_hdr); 1160 1161 /* 1162 * Search for destination options headers or routing 1163 * header(s) through the header chain, and stores each 1164 * header as ancillary data. 1165 * Note that the order of the headers remains in 1166 * the chain of ancillary data. 1167 */ 1168 for (;;) { /* is explicit loop prevention necessary? */ 1169 struct ip6_ext *ip6e = NULL; 1170 int elen; 1171 struct mbuf *ext = NULL; 1172 1173 /* 1174 * if it is not an extension header, don't try to 1175 * pull it from the chain. 1176 */ 1177 switch (nxt) { 1178 case IPPROTO_DSTOPTS: 1179 case IPPROTO_ROUTING: 1180 case IPPROTO_HOPOPTS: 1181 case IPPROTO_AH: /* is it possible? */ 1182 break; 1183 default: 1184 goto loopend; 1185 } 1186 1187 ext = ip6_pullexthdr(m, off, nxt); 1188 if (ext == NULL) { 1189 IP6_STATINC(IP6_STAT_TOOSHORT); 1190 return; 1191 } 1192 ip6e = mtod(ext, struct ip6_ext *); 1193 if (nxt == IPPROTO_AH) 1194 elen = (ip6e->ip6e_len + 2) << 2; 1195 else 1196 elen = (ip6e->ip6e_len + 1) << 3; 1197 if (elen != ext->m_len) { 1198 m_freem(ext); 1199 IP6_STATINC(IP6_STAT_TOOSHORT); 1200 return; 1201 } 1202 KASSERT(IP6_HDR_ALIGNED_P(ip6e)); 1203 1204 switch (nxt) { 1205 case IPPROTO_DSTOPTS: 1206 if (!(in6p->in6p_flags & IN6P_DSTOPTS)) 1207 break; 1208 1209 *mp = sbcreatecontrol((void *)ip6e, elen, 1210 IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS), 1211 IPPROTO_IPV6); 1212 if (*mp) 1213 mp = &(*mp)->m_next; 1214 break; 1215 1216 case IPPROTO_ROUTING: 1217 if (!(in6p->in6p_flags & IN6P_RTHDR)) 1218 break; 1219 1220 *mp = sbcreatecontrol((void *)ip6e, elen, 1221 IS2292(IPV6_2292RTHDR, IPV6_RTHDR), 1222 IPPROTO_IPV6); 1223 if (*mp) 1224 mp = &(*mp)->m_next; 1225 break; 1226 1227 case IPPROTO_HOPOPTS: 1228 case IPPROTO_AH: /* is it possible? */ 1229 break; 1230 1231 default: 1232 /* 1233 * other cases have been filtered in the above. 1234 * none will visit this case. here we supply 1235 * the code just in case (nxt overwritten or 1236 * other cases). 1237 */ 1238 m_freem(ext); 1239 goto loopend; 1240 1241 } 1242 1243 /* proceed with the next header. */ 1244 off += elen; 1245 nxt = ip6e->ip6e_nxt; 1246 ip6e = NULL; 1247 m_freem(ext); 1248 ext = NULL; 1249 } 1250 loopend: 1251 ; 1252 } 1253 } 1254 #undef IS2292 1255 1256 1257 void 1258 ip6_notify_pmtu(struct in6pcb *in6p, const struct sockaddr_in6 *dst, 1259 uint32_t *mtu) 1260 { 1261 struct socket *so; 1262 struct mbuf *m_mtu; 1263 struct ip6_mtuinfo mtuctl; 1264 1265 so = in6p->in6p_socket; 1266 1267 if (mtu == NULL) 1268 return; 1269 1270 #ifdef DIAGNOSTIC 1271 if (so == NULL) /* I believe this is impossible */ 1272 panic("ip6_notify_pmtu: socket is NULL"); 1273 #endif 1274 1275 memset(&mtuctl, 0, sizeof(mtuctl)); /* zero-clear for safety */ 1276 mtuctl.ip6m_mtu = *mtu; 1277 mtuctl.ip6m_addr = *dst; 1278 if (sa6_recoverscope(&mtuctl.ip6m_addr)) 1279 return; 1280 1281 if ((m_mtu = sbcreatecontrol((void *)&mtuctl, sizeof(mtuctl), 1282 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL) 1283 return; 1284 1285 if (sbappendaddr(&so->so_rcv, (const struct sockaddr *)dst, NULL, m_mtu) 1286 == 0) { 1287 m_freem(m_mtu); 1288 /* XXX: should count statistics */ 1289 } else 1290 sorwakeup(so); 1291 1292 return; 1293 } 1294 1295 /* 1296 * pull single extension header from mbuf chain. returns single mbuf that 1297 * contains the result, or NULL on error. 1298 */ 1299 static struct mbuf * 1300 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt) 1301 { 1302 struct ip6_ext ip6e; 1303 size_t elen; 1304 struct mbuf *n; 1305 1306 #ifdef DIAGNOSTIC 1307 switch (nxt) { 1308 case IPPROTO_DSTOPTS: 1309 case IPPROTO_ROUTING: 1310 case IPPROTO_HOPOPTS: 1311 case IPPROTO_AH: /* is it possible? */ 1312 break; 1313 default: 1314 printf("ip6_pullexthdr: invalid nxt=%d\n", nxt); 1315 } 1316 #endif 1317 1318 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1319 if (nxt == IPPROTO_AH) 1320 elen = (ip6e.ip6e_len + 2) << 2; 1321 else 1322 elen = (ip6e.ip6e_len + 1) << 3; 1323 1324 MGET(n, M_DONTWAIT, MT_DATA); 1325 if (n && elen >= MLEN) { 1326 MCLGET(n, M_DONTWAIT); 1327 if ((n->m_flags & M_EXT) == 0) { 1328 m_free(n); 1329 n = NULL; 1330 } 1331 } 1332 if (!n) 1333 return NULL; 1334 1335 n->m_len = 0; 1336 if (elen >= M_TRAILINGSPACE(n)) { 1337 m_free(n); 1338 return NULL; 1339 } 1340 1341 m_copydata(m, off, elen, mtod(n, void *)); 1342 n->m_len = elen; 1343 return n; 1344 } 1345 1346 /* 1347 * Get pointer to the previous header followed by the header 1348 * currently processed. 1349 * XXX: This function supposes that 1350 * M includes all headers, 1351 * the next header field and the header length field of each header 1352 * are valid, and 1353 * the sum of each header length equals to OFF. 1354 * Because of these assumptions, this function must be called very 1355 * carefully. Moreover, it will not be used in the near future when 1356 * we develop `neater' mechanism to process extension headers. 1357 */ 1358 u_int8_t * 1359 ip6_get_prevhdr(struct mbuf *m, int off) 1360 { 1361 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1362 1363 if (off == sizeof(struct ip6_hdr)) 1364 return (&ip6->ip6_nxt); 1365 else { 1366 int len, nxt; 1367 struct ip6_ext *ip6e = NULL; 1368 1369 nxt = ip6->ip6_nxt; 1370 len = sizeof(struct ip6_hdr); 1371 while (len < off) { 1372 ip6e = (struct ip6_ext *)(mtod(m, char *) + len); 1373 1374 switch (nxt) { 1375 case IPPROTO_FRAGMENT: 1376 len += sizeof(struct ip6_frag); 1377 break; 1378 case IPPROTO_AH: 1379 len += (ip6e->ip6e_len + 2) << 2; 1380 break; 1381 default: 1382 len += (ip6e->ip6e_len + 1) << 3; 1383 break; 1384 } 1385 nxt = ip6e->ip6e_nxt; 1386 } 1387 if (ip6e) 1388 return (&ip6e->ip6e_nxt); 1389 else 1390 return NULL; 1391 } 1392 } 1393 1394 /* 1395 * get next header offset. m will be retained. 1396 */ 1397 int 1398 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp) 1399 { 1400 struct ip6_hdr ip6; 1401 struct ip6_ext ip6e; 1402 struct ip6_frag fh; 1403 1404 /* just in case */ 1405 if (m == NULL) 1406 panic("ip6_nexthdr: m == NULL"); 1407 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off) 1408 return -1; 1409 1410 switch (proto) { 1411 case IPPROTO_IPV6: 1412 /* do not chase beyond intermediate IPv6 headers */ 1413 if (off != 0) 1414 return -1; 1415 if (m->m_pkthdr.len < off + sizeof(ip6)) 1416 return -1; 1417 m_copydata(m, off, sizeof(ip6), (void *)&ip6); 1418 if (nxtp) 1419 *nxtp = ip6.ip6_nxt; 1420 off += sizeof(ip6); 1421 return off; 1422 1423 case IPPROTO_FRAGMENT: 1424 /* 1425 * terminate parsing if it is not the first fragment, 1426 * it does not make sense to parse through it. 1427 */ 1428 if (m->m_pkthdr.len < off + sizeof(fh)) 1429 return -1; 1430 m_copydata(m, off, sizeof(fh), (void *)&fh); 1431 if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0) 1432 return -1; 1433 if (nxtp) 1434 *nxtp = fh.ip6f_nxt; 1435 off += sizeof(struct ip6_frag); 1436 return off; 1437 1438 case IPPROTO_AH: 1439 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1440 return -1; 1441 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1442 if (nxtp) 1443 *nxtp = ip6e.ip6e_nxt; 1444 off += (ip6e.ip6e_len + 2) << 2; 1445 if (m->m_pkthdr.len < off) 1446 return -1; 1447 return off; 1448 1449 case IPPROTO_HOPOPTS: 1450 case IPPROTO_ROUTING: 1451 case IPPROTO_DSTOPTS: 1452 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1453 return -1; 1454 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1455 if (nxtp) 1456 *nxtp = ip6e.ip6e_nxt; 1457 off += (ip6e.ip6e_len + 1) << 3; 1458 if (m->m_pkthdr.len < off) 1459 return -1; 1460 return off; 1461 1462 case IPPROTO_NONE: 1463 case IPPROTO_ESP: 1464 case IPPROTO_IPCOMP: 1465 /* give up */ 1466 return -1; 1467 1468 default: 1469 return -1; 1470 } 1471 } 1472 1473 /* 1474 * get offset for the last header in the chain. m will be kept untainted. 1475 */ 1476 int 1477 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp) 1478 { 1479 int newoff; 1480 int nxt; 1481 1482 if (!nxtp) { 1483 nxt = -1; 1484 nxtp = &nxt; 1485 } 1486 for (;;) { 1487 newoff = ip6_nexthdr(m, off, proto, nxtp); 1488 if (newoff < 0) 1489 return off; 1490 else if (newoff < off) 1491 return -1; /* invalid */ 1492 else if (newoff == off) 1493 return newoff; 1494 1495 off = newoff; 1496 proto = *nxtp; 1497 } 1498 } 1499 1500 struct m_tag * 1501 ip6_addaux(struct mbuf *m) 1502 { 1503 struct m_tag *mtag; 1504 1505 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1506 if (!mtag) { 1507 mtag = m_tag_get(PACKET_TAG_INET6, sizeof(struct ip6aux), 1508 M_NOWAIT); 1509 if (mtag) { 1510 m_tag_prepend(m, mtag); 1511 memset(mtag + 1, 0, sizeof(struct ip6aux)); 1512 } 1513 } 1514 return mtag; 1515 } 1516 1517 struct m_tag * 1518 ip6_findaux(struct mbuf *m) 1519 { 1520 struct m_tag *mtag; 1521 1522 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1523 return mtag; 1524 } 1525 1526 void 1527 ip6_delaux(struct mbuf *m) 1528 { 1529 struct m_tag *mtag; 1530 1531 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1532 if (mtag) 1533 m_tag_delete(m, mtag); 1534 } 1535 1536 #ifdef GATEWAY 1537 /* 1538 * sysctl helper routine for net.inet.ip6.maxflows. Since 1539 * we could reduce this value, call ip6flow_reap(); 1540 */ 1541 static int 1542 sysctl_net_inet6_ip6_maxflows(SYSCTLFN_ARGS) 1543 { 1544 int error; 1545 1546 error = sysctl_lookup(SYSCTLFN_CALL(rnode)); 1547 if (error || newp == NULL) 1548 return (error); 1549 1550 mutex_enter(softnet_lock); 1551 KERNEL_LOCK(1, NULL); 1552 1553 ip6flow_reap(0); 1554 1555 KERNEL_UNLOCK_ONE(NULL); 1556 mutex_exit(softnet_lock); 1557 1558 return (0); 1559 } 1560 1561 static int 1562 sysctl_net_inet6_ip6_hashsize(SYSCTLFN_ARGS) 1563 { 1564 int error, tmp; 1565 struct sysctlnode node; 1566 1567 node = *rnode; 1568 tmp = ip6_hashsize; 1569 node.sysctl_data = &tmp; 1570 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 1571 if (error || newp == NULL) 1572 return (error); 1573 1574 if ((tmp & (tmp - 1)) == 0 && tmp != 0) { 1575 /* 1576 * Can only fail due to malloc() 1577 */ 1578 mutex_enter(softnet_lock); 1579 KERNEL_LOCK(1, NULL); 1580 1581 error = ip6flow_invalidate_all(tmp); 1582 1583 KERNEL_UNLOCK_ONE(NULL); 1584 mutex_exit(softnet_lock); 1585 } else { 1586 /* 1587 * EINVAL if not a power of 2 1588 */ 1589 error = EINVAL; 1590 } 1591 1592 return error; 1593 } 1594 #endif /* GATEWAY */ 1595 1596 /* 1597 * System control for IP6 1598 */ 1599 1600 const u_char inet6ctlerrmap[PRC_NCMDS] = { 1601 0, 0, 0, 0, 1602 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 1603 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 1604 EMSGSIZE, EHOSTUNREACH, 0, 0, 1605 0, 0, 0, 0, 1606 ENOPROTOOPT 1607 }; 1608 1609 extern int sysctl_net_inet6_addrctlpolicy(SYSCTLFN_ARGS); 1610 1611 static int 1612 sysctl_net_inet6_ip6_stats(SYSCTLFN_ARGS) 1613 { 1614 1615 return (NETSTAT_SYSCTL(ip6stat_percpu, IP6_NSTATS)); 1616 } 1617 1618 static void 1619 sysctl_net_inet6_ip6_setup(struct sysctllog **clog) 1620 { 1621 #ifdef RFC2292 1622 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y)) 1623 #else 1624 #define IS2292(x, y) (y) 1625 #endif 1626 1627 sysctl_createv(clog, 0, NULL, NULL, 1628 CTLFLAG_PERMANENT, 1629 CTLTYPE_NODE, "inet6", 1630 SYSCTL_DESCR("PF_INET6 related settings"), 1631 NULL, 0, NULL, 0, 1632 CTL_NET, PF_INET6, CTL_EOL); 1633 sysctl_createv(clog, 0, NULL, NULL, 1634 CTLFLAG_PERMANENT, 1635 CTLTYPE_NODE, "ip6", 1636 SYSCTL_DESCR("IPv6 related settings"), 1637 NULL, 0, NULL, 0, 1638 CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_EOL); 1639 1640 sysctl_createv(clog, 0, NULL, NULL, 1641 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1642 CTLTYPE_INT, "forwarding", 1643 SYSCTL_DESCR("Enable forwarding of INET6 datagrams"), 1644 NULL, 0, &ip6_forwarding, 0, 1645 CTL_NET, PF_INET6, IPPROTO_IPV6, 1646 IPV6CTL_FORWARDING, CTL_EOL); 1647 sysctl_createv(clog, 0, NULL, NULL, 1648 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1649 CTLTYPE_INT, "redirect", 1650 SYSCTL_DESCR("Enable sending of ICMPv6 redirect messages"), 1651 NULL, 0, &ip6_sendredirects, 0, 1652 CTL_NET, PF_INET6, IPPROTO_IPV6, 1653 IPV6CTL_SENDREDIRECTS, CTL_EOL); 1654 sysctl_createv(clog, 0, NULL, NULL, 1655 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1656 CTLTYPE_INT, "hlim", 1657 SYSCTL_DESCR("Hop limit for an INET6 datagram"), 1658 NULL, 0, &ip6_defhlim, 0, 1659 CTL_NET, PF_INET6, IPPROTO_IPV6, 1660 IPV6CTL_DEFHLIM, CTL_EOL); 1661 #ifdef notyet 1662 sysctl_createv(clog, 0, NULL, NULL, 1663 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1664 CTLTYPE_INT, "mtu", NULL, 1665 NULL, 0, &, 0, 1666 CTL_NET, PF_INET6, IPPROTO_IPV6, 1667 IPV6CTL_DEFMTU, CTL_EOL); 1668 #endif 1669 #ifdef __no_idea__ 1670 sysctl_createv(clog, 0, NULL, NULL, 1671 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1672 CTLTYPE_INT, "forwsrcrt", NULL, 1673 NULL, 0, &?, 0, 1674 CTL_NET, PF_INET6, IPPROTO_IPV6, 1675 IPV6CTL_FORWSRCRT, CTL_EOL); 1676 sysctl_createv(clog, 0, NULL, NULL, 1677 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1678 CTLTYPE_STRUCT, "mrtstats", NULL, 1679 NULL, 0, &?, sizeof(?), 1680 CTL_NET, PF_INET6, IPPROTO_IPV6, 1681 IPV6CTL_MRTSTATS, CTL_EOL); 1682 sysctl_createv(clog, 0, NULL, NULL, 1683 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1684 CTLTYPE_?, "mrtproto", NULL, 1685 NULL, 0, &?, sizeof(?), 1686 CTL_NET, PF_INET6, IPPROTO_IPV6, 1687 IPV6CTL_MRTPROTO, CTL_EOL); 1688 #endif 1689 sysctl_createv(clog, 0, NULL, NULL, 1690 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1691 CTLTYPE_INT, "maxfragpackets", 1692 SYSCTL_DESCR("Maximum number of fragments to buffer " 1693 "for reassembly"), 1694 NULL, 0, &ip6_maxfragpackets, 0, 1695 CTL_NET, PF_INET6, IPPROTO_IPV6, 1696 IPV6CTL_MAXFRAGPACKETS, CTL_EOL); 1697 #ifdef __no_idea__ 1698 sysctl_createv(clog, 0, NULL, NULL, 1699 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1700 CTLTYPE_INT, "sourcecheck", NULL, 1701 NULL, 0, &?, 0, 1702 CTL_NET, PF_INET6, IPPROTO_IPV6, 1703 IPV6CTL_SOURCECHECK, CTL_EOL); 1704 sysctl_createv(clog, 0, NULL, NULL, 1705 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1706 CTLTYPE_INT, "sourcecheck_logint", NULL, 1707 NULL, 0, &?, 0, 1708 CTL_NET, PF_INET6, IPPROTO_IPV6, 1709 IPV6CTL_SOURCECHECK_LOGINT, CTL_EOL); 1710 #endif 1711 sysctl_createv(clog, 0, NULL, NULL, 1712 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1713 CTLTYPE_INT, "accept_rtadv", 1714 SYSCTL_DESCR("Accept router advertisements"), 1715 NULL, 0, &ip6_accept_rtadv, 0, 1716 CTL_NET, PF_INET6, IPPROTO_IPV6, 1717 IPV6CTL_ACCEPT_RTADV, CTL_EOL); 1718 sysctl_createv(clog, 0, NULL, NULL, 1719 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1720 CTLTYPE_INT, "rtadv_maxroutes", 1721 SYSCTL_DESCR("Maximum number of routes accepted via router advertisements"), 1722 NULL, 0, &ip6_rtadv_maxroutes, 0, 1723 CTL_NET, PF_INET6, IPPROTO_IPV6, 1724 IPV6CTL_RTADV_MAXROUTES, CTL_EOL); 1725 sysctl_createv(clog, 0, NULL, NULL, 1726 CTLFLAG_PERMANENT, 1727 CTLTYPE_INT, "rtadv_numroutes", 1728 SYSCTL_DESCR("Current number of routes accepted via router advertisements"), 1729 NULL, 0, &nd6_numroutes, 0, 1730 CTL_NET, PF_INET6, IPPROTO_IPV6, 1731 IPV6CTL_RTADV_NUMROUTES, CTL_EOL); 1732 sysctl_createv(clog, 0, NULL, NULL, 1733 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1734 CTLTYPE_INT, "keepfaith", 1735 SYSCTL_DESCR("Activate faith interface"), 1736 NULL, 0, &ip6_keepfaith, 0, 1737 CTL_NET, PF_INET6, IPPROTO_IPV6, 1738 IPV6CTL_KEEPFAITH, CTL_EOL); 1739 sysctl_createv(clog, 0, NULL, NULL, 1740 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1741 CTLTYPE_INT, "log_interval", 1742 SYSCTL_DESCR("Minumum interval between logging " 1743 "unroutable packets"), 1744 NULL, 0, &ip6_log_interval, 0, 1745 CTL_NET, PF_INET6, IPPROTO_IPV6, 1746 IPV6CTL_LOG_INTERVAL, CTL_EOL); 1747 sysctl_createv(clog, 0, NULL, NULL, 1748 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1749 CTLTYPE_INT, "hdrnestlimit", 1750 SYSCTL_DESCR("Maximum number of nested IPv6 headers"), 1751 NULL, 0, &ip6_hdrnestlimit, 0, 1752 CTL_NET, PF_INET6, IPPROTO_IPV6, 1753 IPV6CTL_HDRNESTLIMIT, CTL_EOL); 1754 sysctl_createv(clog, 0, NULL, NULL, 1755 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1756 CTLTYPE_INT, "dad_count", 1757 SYSCTL_DESCR("Number of Duplicate Address Detection " 1758 "probes to send"), 1759 NULL, 0, &ip6_dad_count, 0, 1760 CTL_NET, PF_INET6, IPPROTO_IPV6, 1761 IPV6CTL_DAD_COUNT, CTL_EOL); 1762 sysctl_createv(clog, 0, NULL, NULL, 1763 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1764 CTLTYPE_INT, "auto_flowlabel", 1765 SYSCTL_DESCR("Assign random IPv6 flow labels"), 1766 NULL, 0, &ip6_auto_flowlabel, 0, 1767 CTL_NET, PF_INET6, IPPROTO_IPV6, 1768 IPV6CTL_AUTO_FLOWLABEL, CTL_EOL); 1769 sysctl_createv(clog, 0, NULL, NULL, 1770 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1771 CTLTYPE_INT, "defmcasthlim", 1772 SYSCTL_DESCR("Default multicast hop limit"), 1773 NULL, 0, &ip6_defmcasthlim, 0, 1774 CTL_NET, PF_INET6, IPPROTO_IPV6, 1775 IPV6CTL_DEFMCASTHLIM, CTL_EOL); 1776 sysctl_createv(clog, 0, NULL, NULL, 1777 CTLFLAG_PERMANENT, 1778 CTLTYPE_STRING, "kame_version", 1779 SYSCTL_DESCR("KAME Version"), 1780 NULL, 0, __UNCONST(__KAME_VERSION), 0, 1781 CTL_NET, PF_INET6, IPPROTO_IPV6, 1782 IPV6CTL_KAME_VERSION, CTL_EOL); 1783 sysctl_createv(clog, 0, NULL, NULL, 1784 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1785 CTLTYPE_INT, "use_deprecated", 1786 SYSCTL_DESCR("Allow use of deprecated addresses as " 1787 "source addresses"), 1788 NULL, 0, &ip6_use_deprecated, 0, 1789 CTL_NET, PF_INET6, IPPROTO_IPV6, 1790 IPV6CTL_USE_DEPRECATED, CTL_EOL); 1791 sysctl_createv(clog, 0, NULL, NULL, 1792 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1793 CTLTYPE_INT, "rr_prune", NULL, 1794 NULL, 0, &ip6_rr_prune, 0, 1795 CTL_NET, PF_INET6, IPPROTO_IPV6, 1796 IPV6CTL_RR_PRUNE, CTL_EOL); 1797 sysctl_createv(clog, 0, NULL, NULL, 1798 CTLFLAG_PERMANENT 1799 #ifndef INET6_BINDV6ONLY 1800 |CTLFLAG_READWRITE, 1801 #endif 1802 CTLTYPE_INT, "v6only", 1803 SYSCTL_DESCR("Disallow PF_INET6 sockets from connecting " 1804 "to PF_INET sockets"), 1805 NULL, 0, &ip6_v6only, 0, 1806 CTL_NET, PF_INET6, IPPROTO_IPV6, 1807 IPV6CTL_V6ONLY, CTL_EOL); 1808 sysctl_createv(clog, 0, NULL, NULL, 1809 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1810 CTLTYPE_INT, "anonportmin", 1811 SYSCTL_DESCR("Lowest ephemeral port number to assign"), 1812 sysctl_net_inet_ip_ports, 0, &ip6_anonportmin, 0, 1813 CTL_NET, PF_INET6, IPPROTO_IPV6, 1814 IPV6CTL_ANONPORTMIN, CTL_EOL); 1815 sysctl_createv(clog, 0, NULL, NULL, 1816 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1817 CTLTYPE_INT, "anonportmax", 1818 SYSCTL_DESCR("Highest ephemeral port number to assign"), 1819 sysctl_net_inet_ip_ports, 0, &ip6_anonportmax, 0, 1820 CTL_NET, PF_INET6, IPPROTO_IPV6, 1821 IPV6CTL_ANONPORTMAX, CTL_EOL); 1822 #ifndef IPNOPRIVPORTS 1823 sysctl_createv(clog, 0, NULL, NULL, 1824 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1825 CTLTYPE_INT, "lowportmin", 1826 SYSCTL_DESCR("Lowest privileged ephemeral port number " 1827 "to assign"), 1828 sysctl_net_inet_ip_ports, 0, &ip6_lowportmin, 0, 1829 CTL_NET, PF_INET6, IPPROTO_IPV6, 1830 IPV6CTL_LOWPORTMIN, CTL_EOL); 1831 sysctl_createv(clog, 0, NULL, NULL, 1832 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1833 CTLTYPE_INT, "lowportmax", 1834 SYSCTL_DESCR("Highest privileged ephemeral port number " 1835 "to assign"), 1836 sysctl_net_inet_ip_ports, 0, &ip6_lowportmax, 0, 1837 CTL_NET, PF_INET6, IPPROTO_IPV6, 1838 IPV6CTL_LOWPORTMAX, CTL_EOL); 1839 #endif /* IPNOPRIVPORTS */ 1840 sysctl_createv(clog, 0, NULL, NULL, 1841 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1842 CTLTYPE_INT, "auto_linklocal", 1843 SYSCTL_DESCR("Default value of per-interface flag for " 1844 "adding an IPv6 link-local address to " 1845 "interfaces when attached"), 1846 NULL, 0, &ip6_auto_linklocal, 0, 1847 CTL_NET, PF_INET6, IPPROTO_IPV6, 1848 IPV6CTL_AUTO_LINKLOCAL, CTL_EOL); 1849 sysctl_createv(clog, 0, NULL, NULL, 1850 CTLFLAG_PERMANENT|CTLFLAG_READONLY, 1851 CTLTYPE_STRUCT, "addctlpolicy", 1852 SYSCTL_DESCR("Return the current address control" 1853 " policy"), 1854 sysctl_net_inet6_addrctlpolicy, 0, NULL, 0, 1855 CTL_NET, PF_INET6, IPPROTO_IPV6, 1856 IPV6CTL_ADDRCTLPOLICY, CTL_EOL); 1857 sysctl_createv(clog, 0, NULL, NULL, 1858 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1859 CTLTYPE_INT, "use_tempaddr", 1860 SYSCTL_DESCR("Use temporary address"), 1861 NULL, 0, &ip6_use_tempaddr, 0, 1862 CTL_NET, PF_INET6, IPPROTO_IPV6, 1863 CTL_CREATE, CTL_EOL); 1864 sysctl_createv(clog, 0, NULL, NULL, 1865 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1866 CTLTYPE_INT, "prefer_tempaddr", 1867 SYSCTL_DESCR("Prefer temporary address as source " 1868 "address"), 1869 NULL, 0, &ip6_prefer_tempaddr, 0, 1870 CTL_NET, PF_INET6, IPPROTO_IPV6, 1871 CTL_CREATE, CTL_EOL); 1872 sysctl_createv(clog, 0, NULL, NULL, 1873 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1874 CTLTYPE_INT, "temppltime", 1875 SYSCTL_DESCR("preferred lifetime of a temporary address"), 1876 NULL, 0, &ip6_temp_preferred_lifetime, 0, 1877 CTL_NET, PF_INET6, IPPROTO_IPV6, 1878 CTL_CREATE, CTL_EOL); 1879 sysctl_createv(clog, 0, NULL, NULL, 1880 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1881 CTLTYPE_INT, "tempvltime", 1882 SYSCTL_DESCR("valid lifetime of a temporary address"), 1883 NULL, 0, &ip6_temp_valid_lifetime, 0, 1884 CTL_NET, PF_INET6, IPPROTO_IPV6, 1885 CTL_CREATE, CTL_EOL); 1886 sysctl_createv(clog, 0, NULL, NULL, 1887 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1888 CTLTYPE_INT, "maxfrags", 1889 SYSCTL_DESCR("Maximum fragments in reassembly queue"), 1890 NULL, 0, &ip6_maxfrags, 0, 1891 CTL_NET, PF_INET6, IPPROTO_IPV6, 1892 IPV6CTL_MAXFRAGS, CTL_EOL); 1893 sysctl_createv(clog, 0, NULL, NULL, 1894 CTLFLAG_PERMANENT, 1895 CTLTYPE_STRUCT, "stats", 1896 SYSCTL_DESCR("IPv6 statistics"), 1897 sysctl_net_inet6_ip6_stats, 0, NULL, 0, 1898 CTL_NET, PF_INET6, IPPROTO_IPV6, 1899 IPV6CTL_STATS, CTL_EOL); 1900 sysctl_createv(clog, 0, NULL, NULL, 1901 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1902 CTLTYPE_INT, "use_defaultzone", 1903 SYSCTL_DESCR("Whether to use the default scope zones"), 1904 NULL, 0, &ip6_use_defzone, 0, 1905 CTL_NET, PF_INET6, IPPROTO_IPV6, 1906 IPV6CTL_USE_DEFAULTZONE, CTL_EOL); 1907 sysctl_createv(clog, 0, NULL, NULL, 1908 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1909 CTLTYPE_INT, "mcast_pmtu", 1910 SYSCTL_DESCR("Enable pMTU discovery for multicast packet"), 1911 NULL, 0, &ip6_mcast_pmtu, 0, 1912 CTL_NET, PF_INET6, IPPROTO_IPV6, 1913 CTL_CREATE, CTL_EOL); 1914 #ifdef GATEWAY 1915 sysctl_createv(clog, 0, NULL, NULL, 1916 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1917 CTLTYPE_INT, "maxflows", 1918 SYSCTL_DESCR("Number of flows for fast forwarding (IPv6)"), 1919 sysctl_net_inet6_ip6_maxflows, 0, &ip6_maxflows, 0, 1920 CTL_NET, PF_INET6, IPPROTO_IPV6, 1921 CTL_CREATE, CTL_EOL); 1922 sysctl_createv(clog, 0, NULL, NULL, 1923 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1924 CTLTYPE_INT, "hashsize", 1925 SYSCTL_DESCR("Size of hash table for fast forwarding (IPv6)"), 1926 sysctl_net_inet6_ip6_hashsize, 0, &ip6_hashsize, 0, 1927 CTL_NET, PF_INET6, IPPROTO_IPV6, 1928 CTL_CREATE, CTL_EOL); 1929 #endif 1930 /* anonportalgo RFC6056 subtree */ 1931 const struct sysctlnode *portalgo_node; 1932 sysctl_createv(clog, 0, NULL, &portalgo_node, 1933 CTLFLAG_PERMANENT, 1934 CTLTYPE_NODE, "anonportalgo", 1935 SYSCTL_DESCR("Anonymous port algorithm selection (RFC 6056)"), 1936 NULL, 0, NULL, 0, 1937 CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_CREATE, CTL_EOL); 1938 sysctl_createv(clog, 0, &portalgo_node, NULL, 1939 CTLFLAG_PERMANENT, 1940 CTLTYPE_STRING, "available", 1941 SYSCTL_DESCR("available algorithms"), 1942 sysctl_portalgo_available, 0, NULL, PORTALGO_MAXLEN, 1943 CTL_CREATE, CTL_EOL); 1944 sysctl_createv(clog, 0, &portalgo_node, NULL, 1945 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1946 CTLTYPE_STRING, "selected", 1947 SYSCTL_DESCR("selected algorithm"), 1948 sysctl_portalgo_selected6, 0, NULL, PORTALGO_MAXLEN, 1949 CTL_CREATE, CTL_EOL); 1950 sysctl_createv(clog, 0, &portalgo_node, NULL, 1951 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1952 CTLTYPE_STRUCT, "reserve", 1953 SYSCTL_DESCR("bitmap of reserved ports"), 1954 sysctl_portalgo_reserve6, 0, NULL, 0, 1955 CTL_CREATE, CTL_EOL); 1956 sysctl_createv(clog, 0, NULL, NULL, 1957 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1958 CTLTYPE_INT, "neighborgcthresh", 1959 SYSCTL_DESCR("Maximum number of entries in neighbor" 1960 " cache"), 1961 NULL, 1, &ip6_neighborgcthresh, 0, 1962 CTL_NET, PF_INET6, IPPROTO_IPV6, 1963 CTL_CREATE, CTL_EOL); 1964 sysctl_createv(clog, 0, NULL, NULL, 1965 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1966 CTLTYPE_INT, "maxifprefixes", 1967 SYSCTL_DESCR("Maximum number of prefixes created by" 1968 " route advertisement per interface"), 1969 NULL, 1, &ip6_maxifprefixes, 0, 1970 CTL_NET, PF_INET6, IPPROTO_IPV6, 1971 CTL_CREATE, CTL_EOL); 1972 sysctl_createv(clog, 0, NULL, NULL, 1973 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1974 CTLTYPE_INT, "maxifdefrouters", 1975 SYSCTL_DESCR("Maximum number of default routers created" 1976 " by route advertisement per interface"), 1977 NULL, 1, &ip6_maxifdefrouters, 0, 1978 CTL_NET, PF_INET6, IPPROTO_IPV6, 1979 CTL_CREATE, CTL_EOL); 1980 sysctl_createv(clog, 0, NULL, NULL, 1981 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1982 CTLTYPE_INT, "maxdynroutes", 1983 SYSCTL_DESCR("Maximum number of routes created via" 1984 " redirect"), 1985 NULL, 1, &ip6_maxdynroutes, 0, 1986 CTL_NET, PF_INET6, IPPROTO_IPV6, 1987 CTL_CREATE, CTL_EOL); 1988 } 1989 1990 void 1991 ip6_statinc(u_int stat) 1992 { 1993 1994 KASSERT(stat < IP6_NSTATS); 1995 IP6_STATINC(stat); 1996 } 1997