1 /* $NetBSD: ip6_input.c,v 1.143 2013/06/29 21:06:58 rmind 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 1.143 2013/06/29 21:06:58 rmind Exp $"); 66 67 #include "opt_gateway.h" 68 #include "opt_inet.h" 69 #include "opt_inet6.h" 70 #include "opt_ipsec.h" 71 #include "opt_compat_netbsd.h" 72 73 #include <sys/param.h> 74 #include <sys/systm.h> 75 #include <sys/malloc.h> 76 #include <sys/mbuf.h> 77 #include <sys/domain.h> 78 #include <sys/protosw.h> 79 #include <sys/socket.h> 80 #include <sys/socketvar.h> 81 #include <sys/errno.h> 82 #include <sys/time.h> 83 #include <sys/kernel.h> 84 #include <sys/syslog.h> 85 #include <sys/proc.h> 86 #include <sys/sysctl.h> 87 #include <sys/cprng.h> 88 89 #include <net/if.h> 90 #include <net/if_types.h> 91 #include <net/if_dl.h> 92 #include <net/route.h> 93 #include <net/netisr.h> 94 #include <net/pfil.h> 95 96 #include <netinet/in.h> 97 #include <netinet/in_systm.h> 98 #ifdef INET 99 #include <netinet/ip.h> 100 #include <netinet/ip_icmp.h> 101 #endif /* INET */ 102 #include <netinet/ip6.h> 103 #include <netinet/portalgo.h> 104 #include <netinet6/in6_var.h> 105 #include <netinet6/ip6_var.h> 106 #include <netinet6/ip6_private.h> 107 #include <netinet6/in6_pcb.h> 108 #include <netinet/icmp6.h> 109 #include <netinet6/scope6_var.h> 110 #include <netinet6/in6_ifattach.h> 111 #include <netinet6/nd6.h> 112 113 #ifdef IPSEC 114 #include <netipsec/ipsec.h> 115 #include <netipsec/ipsec6.h> 116 #include <netipsec/key.h> 117 #endif /* IPSEC */ 118 119 #ifdef COMPAT_50 120 #include <compat/sys/time.h> 121 #include <compat/sys/socket.h> 122 #endif 123 124 #include <netinet6/ip6protosw.h> 125 126 #include "faith.h" 127 #include "gif.h" 128 129 #if NGIF > 0 130 #include <netinet6/in6_gif.h> 131 #endif 132 133 #include <net/net_osdep.h> 134 135 extern struct domain inet6domain; 136 137 u_char ip6_protox[IPPROTO_MAX]; 138 static int ip6qmaxlen = IFQ_MAXLEN; 139 struct in6_ifaddr *in6_ifaddr; 140 struct ifqueue ip6intrq; 141 142 extern callout_t in6_tmpaddrtimer_ch; 143 144 int ip6_forward_srcrt; /* XXX */ 145 int ip6_sourcecheck; /* XXX */ 146 int ip6_sourcecheck_interval; /* XXX */ 147 148 pfil_head_t *inet6_pfil_hook; 149 150 percpu_t *ip6stat_percpu; 151 152 static void ip6_init2(void *); 153 static struct m_tag *ip6_setdstifaddr(struct mbuf *, const struct in6_ifaddr *); 154 155 static int ip6_process_hopopts(struct mbuf *, u_int8_t *, int, u_int32_t *, 156 u_int32_t *); 157 static struct mbuf *ip6_pullexthdr(struct mbuf *, size_t, int); 158 static void sysctl_net_inet6_ip6_setup(struct sysctllog **); 159 160 /* 161 * IP6 initialization: fill in IP6 protocol switch table. 162 * All protocols not implemented in kernel go to raw IP6 protocol handler. 163 */ 164 void 165 ip6_init(void) 166 { 167 const struct ip6protosw *pr; 168 int i; 169 170 sysctl_net_inet6_ip6_setup(NULL); 171 pr = (const struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 172 if (pr == 0) 173 panic("ip6_init"); 174 for (i = 0; i < IPPROTO_MAX; i++) 175 ip6_protox[i] = pr - inet6sw; 176 for (pr = (const struct ip6protosw *)inet6domain.dom_protosw; 177 pr < (const struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++) 178 if (pr->pr_domain->dom_family == PF_INET6 && 179 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) 180 ip6_protox[pr->pr_protocol] = pr - inet6sw; 181 ip6intrq.ifq_maxlen = ip6qmaxlen; 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(NULL); 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 } 198 199 static void 200 ip6_init2(void *dummy) 201 { 202 203 /* nd6_timer_init */ 204 callout_init(&nd6_timer_ch, CALLOUT_MPSAFE); 205 callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL); 206 207 /* timer for regeneranation of temporary addresses randomize ID */ 208 callout_init(&in6_tmpaddrtimer_ch, CALLOUT_MPSAFE); 209 callout_reset(&in6_tmpaddrtimer_ch, 210 (ip6_temp_preferred_lifetime - ip6_desync_factor - 211 ip6_temp_regen_advance) * hz, 212 in6_tmpaddrtimer, NULL); 213 } 214 215 /* 216 * IP6 input interrupt handling. Just pass the packet to ip6_input. 217 */ 218 void 219 ip6intr(void) 220 { 221 int s; 222 struct mbuf *m; 223 224 mutex_enter(softnet_lock); 225 KERNEL_LOCK(1, NULL); 226 for (;;) { 227 s = splnet(); 228 IF_DEQUEUE(&ip6intrq, m); 229 splx(s); 230 if (m == 0) 231 break; 232 /* drop the packet if IPv6 operation is disabled on the IF */ 233 if ((ND_IFINFO(m->m_pkthdr.rcvif)->flags & ND6_IFF_IFDISABLED)) { 234 m_freem(m); 235 break; 236 } 237 ip6_input(m); 238 } 239 KERNEL_UNLOCK_ONE(NULL); 240 mutex_exit(softnet_lock); 241 } 242 243 extern struct route ip6_forward_rt; 244 245 void 246 ip6_input(struct mbuf *m) 247 { 248 struct ip6_hdr *ip6; 249 int hit, off = sizeof(struct ip6_hdr), nest; 250 u_int32_t plen; 251 u_int32_t rtalert = ~0; 252 int nxt, ours = 0, rh_present = 0; 253 struct ifnet *deliverifp = NULL; 254 int srcrt = 0; 255 const struct rtentry *rt; 256 union { 257 struct sockaddr dst; 258 struct sockaddr_in6 dst6; 259 } u; 260 #ifdef IPSEC 261 struct m_tag *mtag; 262 struct tdb_ident *tdbi; 263 struct secpolicy *sp; 264 int s, error; 265 #endif 266 267 /* 268 * make sure we don't have onion peering information into m_tag. 269 */ 270 ip6_delaux(m); 271 272 /* 273 * mbuf statistics 274 */ 275 if (m->m_flags & M_EXT) { 276 if (m->m_next) 277 IP6_STATINC(IP6_STAT_MEXT2M); 278 else 279 IP6_STATINC(IP6_STAT_MEXT1); 280 } else { 281 #define M2MMAX 32 282 if (m->m_next) { 283 if (m->m_flags & M_LOOP) { 284 /*XXX*/ IP6_STATINC(IP6_STAT_M2M + lo0ifp->if_index); 285 } else if (m->m_pkthdr.rcvif->if_index < M2MMAX) { 286 IP6_STATINC(IP6_STAT_M2M + 287 m->m_pkthdr.rcvif->if_index); 288 } else 289 IP6_STATINC(IP6_STAT_M2M); 290 } else 291 IP6_STATINC(IP6_STAT_M1); 292 #undef M2MMAX 293 } 294 295 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive); 296 IP6_STATINC(IP6_STAT_TOTAL); 297 298 /* 299 * If the IPv6 header is not aligned, slurp it up into a new 300 * mbuf with space for link headers, in the event we forward 301 * it. Otherwise, if it is aligned, make sure the entire base 302 * IPv6 header is in the first mbuf of the chain. 303 */ 304 if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 305 struct ifnet *inifp = m->m_pkthdr.rcvif; 306 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 307 (max_linkhdr + 3) & ~3)) == NULL) { 308 /* XXXJRT new stat, please */ 309 IP6_STATINC(IP6_STAT_TOOSMALL); 310 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 311 return; 312 } 313 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 314 struct ifnet *inifp = m->m_pkthdr.rcvif; 315 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 316 IP6_STATINC(IP6_STAT_TOOSMALL); 317 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 318 return; 319 } 320 } 321 322 ip6 = mtod(m, struct ip6_hdr *); 323 324 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 325 IP6_STATINC(IP6_STAT_BADVERS); 326 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 327 goto bad; 328 } 329 330 /* 331 * Assume that we can create a fast-forward IP flow entry 332 * based on this packet. 333 */ 334 m->m_flags |= M_CANFASTFWD; 335 336 /* 337 * Run through list of hooks for input packets. If there are any 338 * filters which require that additional packets in the flow are 339 * not fast-forwarded, they must clear the M_CANFASTFWD flag. 340 * Note that filters must _never_ set this flag, as another filter 341 * in the list may have previously cleared it. 342 */ 343 /* 344 * let ipfilter look at packet on the wire, 345 * not the decapsulated packet. 346 */ 347 #if defined(IPSEC) 348 if (!ipsec_indone(m)) 349 #else 350 if (1) 351 #endif 352 { 353 struct in6_addr odst; 354 355 odst = ip6->ip6_dst; 356 if (pfil_run_hooks(inet6_pfil_hook, &m, m->m_pkthdr.rcvif, 357 PFIL_IN) != 0) 358 return; 359 if (m == NULL) 360 return; 361 ip6 = mtod(m, struct ip6_hdr *); 362 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst); 363 } 364 365 IP6_STATINC(IP6_STAT_NXTHIST + ip6->ip6_nxt); 366 367 #ifdef ALTQ 368 if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) { 369 /* packet is dropped by traffic conditioner */ 370 return; 371 } 372 #endif 373 374 /* 375 * Check against address spoofing/corruption. 376 */ 377 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) || 378 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) { 379 /* 380 * XXX: "badscope" is not very suitable for a multicast source. 381 */ 382 IP6_STATINC(IP6_STAT_BADSCOPE); 383 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 384 goto bad; 385 } 386 /* 387 * The following check is not documented in specs. A malicious 388 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack 389 * and bypass security checks (act as if it was from 127.0.0.1 by using 390 * IPv6 src ::ffff:127.0.0.1). Be cautious. 391 * 392 * This check chokes if we are in an SIIT cloud. As none of BSDs 393 * support IPv4-less kernel compilation, we cannot support SIIT 394 * environment at all. So, it makes more sense for us to reject any 395 * malicious packets for non-SIIT environment, than try to do a 396 * partial support for SIIT environment. 397 */ 398 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 399 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 400 IP6_STATINC(IP6_STAT_BADSCOPE); 401 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 402 goto bad; 403 } 404 #if 0 405 /* 406 * Reject packets with IPv4 compatible addresses (auto tunnel). 407 * 408 * The code forbids auto tunnel relay case in RFC1933 (the check is 409 * stronger than RFC1933). We may want to re-enable it if mech-xx 410 * is revised to forbid relaying case. 411 */ 412 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) || 413 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) { 414 IP6_STATINC(IP6_STAT_BADSCOPE); 415 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 416 goto bad; 417 } 418 #endif 419 420 /* 421 * Disambiguate address scope zones (if there is ambiguity). 422 * We first make sure that the original source or destination address 423 * is not in our internal form for scoped addresses. Such addresses 424 * are not necessarily invalid spec-wise, but we cannot accept them due 425 * to the usage conflict. 426 * in6_setscope() then also checks and rejects the cases where src or 427 * dst are the loopback address and the receiving interface 428 * is not loopback. 429 */ 430 if (__predict_false( 431 m_makewritable(&m, 0, sizeof(struct ip6_hdr), M_DONTWAIT))) 432 goto bad; 433 ip6 = mtod(m, struct ip6_hdr *); 434 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) { 435 IP6_STATINC(IP6_STAT_BADSCOPE); /* XXX */ 436 goto bad; 437 } 438 if (in6_setscope(&ip6->ip6_src, m->m_pkthdr.rcvif, NULL) || 439 in6_setscope(&ip6->ip6_dst, m->m_pkthdr.rcvif, NULL)) { 440 IP6_STATINC(IP6_STAT_BADSCOPE); 441 goto bad; 442 } 443 444 /* 445 * Multicast check 446 */ 447 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 448 struct in6_multi *in6m = 0; 449 450 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast); 451 /* 452 * See if we belong to the destination multicast group on the 453 * arrival interface. 454 */ 455 IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m); 456 if (in6m) 457 ours = 1; 458 else if (!ip6_mrouter) { 459 uint64_t *ip6s = IP6_STAT_GETREF(); 460 ip6s[IP6_STAT_NOTMEMBER]++; 461 ip6s[IP6_STAT_CANTFORWARD]++; 462 IP6_STAT_PUTREF(); 463 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 464 goto bad; 465 } 466 deliverifp = m->m_pkthdr.rcvif; 467 goto hbhcheck; 468 } 469 470 sockaddr_in6_init(&u.dst6, &ip6->ip6_dst, 0, 0, 0); 471 472 /* 473 * Unicast check 474 */ 475 rt = rtcache_lookup2(&ip6_forward_rt, &u.dst, 1, &hit); 476 if (hit) 477 IP6_STATINC(IP6_STAT_FORWARD_CACHEHIT); 478 else 479 IP6_STATINC(IP6_STAT_FORWARD_CACHEMISS); 480 481 #define rt6_getkey(__rt) satocsin6(rt_getkey(__rt)) 482 483 /* 484 * Accept the packet if the forwarding interface to the destination 485 * according to the routing table is the loopback interface, 486 * unless the associated route has a gateway. 487 * Note that this approach causes to accept a packet if there is a 488 * route to the loopback interface for the destination of the packet. 489 * But we think it's even useful in some situations, e.g. when using 490 * a special daemon which wants to intercept the packet. 491 */ 492 if (rt != NULL && 493 (rt->rt_flags & (RTF_HOST|RTF_GATEWAY)) == RTF_HOST && 494 !(rt->rt_flags & RTF_CLONED) && 495 #if 0 496 /* 497 * The check below is redundant since the comparison of 498 * the destination and the key of the rtentry has 499 * already done through looking up the routing table. 500 */ 501 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &rt6_getkey(rt)->sin6_addr) && 502 #endif 503 rt->rt_ifp->if_type == IFT_LOOP) { 504 struct in6_ifaddr *ia6 = (struct in6_ifaddr *)rt->rt_ifa; 505 if (ia6->ia6_flags & IN6_IFF_ANYCAST) 506 m->m_flags |= M_ANYCAST6; 507 /* 508 * packets to a tentative, duplicated, or somehow invalid 509 * address must not be accepted. 510 */ 511 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) { 512 /* this address is ready */ 513 ours = 1; 514 deliverifp = ia6->ia_ifp; /* correct? */ 515 goto hbhcheck; 516 } else { 517 /* address is not ready, so discard the packet. */ 518 nd6log((LOG_INFO, 519 "ip6_input: packet to an unready address %s->%s\n", 520 ip6_sprintf(&ip6->ip6_src), 521 ip6_sprintf(&ip6->ip6_dst))); 522 523 goto bad; 524 } 525 } 526 527 /* 528 * FAITH (Firewall Aided Internet Translator) 529 */ 530 #if defined(NFAITH) && 0 < NFAITH 531 if (ip6_keepfaith) { 532 if (rt != NULL && rt->rt_ifp != NULL && 533 rt->rt_ifp->if_type == IFT_FAITH) { 534 /* XXX do we need more sanity checks? */ 535 ours = 1; 536 deliverifp = rt->rt_ifp; /* faith */ 537 goto hbhcheck; 538 } 539 } 540 #endif 541 542 #if 0 543 { 544 /* 545 * Last resort: check in6_ifaddr for incoming interface. 546 * The code is here until I update the "goto ours hack" code above 547 * working right. 548 */ 549 struct ifaddr *ifa; 550 IFADDR_FOREACH(ifa, m->m_pkthdr.rcvif) { 551 if (ifa->ifa_addr == NULL) 552 continue; /* just for safety */ 553 if (ifa->ifa_addr->sa_family != AF_INET6) 554 continue; 555 if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) { 556 ours = 1; 557 deliverifp = ifa->ifa_ifp; 558 goto hbhcheck; 559 } 560 } 561 } 562 #endif 563 564 /* 565 * Now there is no reason to process the packet if it's not our own 566 * and we're not a router. 567 */ 568 if (!ip6_forwarding) { 569 IP6_STATINC(IP6_STAT_CANTFORWARD); 570 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 571 goto bad; 572 } 573 574 hbhcheck: 575 /* 576 * record address information into m_tag, if we don't have one yet. 577 * note that we are unable to record it, if the address is not listed 578 * as our interface address (e.g. multicast addresses, addresses 579 * within FAITH prefixes and such). 580 */ 581 if (deliverifp && ip6_getdstifaddr(m) == NULL) { 582 struct in6_ifaddr *ia6; 583 584 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 585 if (ia6 != NULL && ip6_setdstifaddr(m, ia6) == NULL) { 586 /* 587 * XXX maybe we should drop the packet here, 588 * as we could not provide enough information 589 * to the upper layers. 590 */ 591 } 592 } 593 594 /* 595 * Process Hop-by-Hop options header if it's contained. 596 * m may be modified in ip6_hopopts_input(). 597 * If a JumboPayload option is included, plen will also be modified. 598 */ 599 plen = (u_int32_t)ntohs(ip6->ip6_plen); 600 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 601 struct ip6_hbh *hbh; 602 603 if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) { 604 #if 0 /*touches NULL pointer*/ 605 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 606 #endif 607 return; /* m have already been freed */ 608 } 609 610 /* adjust pointer */ 611 ip6 = mtod(m, struct ip6_hdr *); 612 613 /* 614 * if the payload length field is 0 and the next header field 615 * indicates Hop-by-Hop Options header, then a Jumbo Payload 616 * option MUST be included. 617 */ 618 if (ip6->ip6_plen == 0 && plen == 0) { 619 /* 620 * Note that if a valid jumbo payload option is 621 * contained, ip6_hopopts_input() must set a valid 622 * (non-zero) payload length to the variable plen. 623 */ 624 IP6_STATINC(IP6_STAT_BADOPTIONS); 625 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 626 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 627 icmp6_error(m, ICMP6_PARAM_PROB, 628 ICMP6_PARAMPROB_HEADER, 629 (char *)&ip6->ip6_plen - (char *)ip6); 630 return; 631 } 632 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 633 sizeof(struct ip6_hbh)); 634 if (hbh == NULL) { 635 IP6_STATINC(IP6_STAT_TOOSHORT); 636 return; 637 } 638 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 639 nxt = hbh->ip6h_nxt; 640 641 /* 642 * accept the packet if a router alert option is included 643 * and we act as an IPv6 router. 644 */ 645 if (rtalert != ~0 && ip6_forwarding) 646 ours = 1; 647 } else 648 nxt = ip6->ip6_nxt; 649 650 /* 651 * Check that the amount of data in the buffers 652 * is as at least much as the IPv6 header would have us expect. 653 * Trim mbufs if longer than we expect. 654 * Drop packet if shorter than we expect. 655 */ 656 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 657 IP6_STATINC(IP6_STAT_TOOSHORT); 658 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 659 goto bad; 660 } 661 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 662 if (m->m_len == m->m_pkthdr.len) { 663 m->m_len = sizeof(struct ip6_hdr) + plen; 664 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 665 } else 666 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 667 } 668 669 /* 670 * Forward if desirable. 671 */ 672 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 673 /* 674 * If we are acting as a multicast router, all 675 * incoming multicast packets are passed to the 676 * kernel-level multicast forwarding function. 677 * The packet is returned (relatively) intact; if 678 * ip6_mforward() returns a non-zero value, the packet 679 * must be discarded, else it may be accepted below. 680 */ 681 if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) { 682 IP6_STATINC(IP6_STAT_CANTFORWARD); 683 m_freem(m); 684 return; 685 } 686 if (!ours) { 687 m_freem(m); 688 return; 689 } 690 } else if (!ours) { 691 ip6_forward(m, srcrt); 692 return; 693 } 694 695 ip6 = mtod(m, struct ip6_hdr *); 696 697 /* 698 * Malicious party may be able to use IPv4 mapped addr to confuse 699 * tcp/udp stack and bypass security checks (act as if it was from 700 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious. 701 * 702 * For SIIT end node behavior, you may want to disable the check. 703 * However, you will become vulnerable to attacks using IPv4 mapped 704 * source. 705 */ 706 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 707 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 708 IP6_STATINC(IP6_STAT_BADSCOPE); 709 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 710 goto bad; 711 } 712 713 /* 714 * Tell launch routine the next header 715 */ 716 #ifdef IFA_STATS 717 if (deliverifp != NULL) { 718 struct in6_ifaddr *ia6; 719 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 720 if (ia6) 721 ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len; 722 } 723 #endif 724 IP6_STATINC(IP6_STAT_DELIVERED); 725 in6_ifstat_inc(deliverifp, ifs6_in_deliver); 726 nest = 0; 727 728 rh_present = 0; 729 while (nxt != IPPROTO_DONE) { 730 if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) { 731 IP6_STATINC(IP6_STAT_TOOMANYHDR); 732 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 733 goto bad; 734 } 735 736 /* 737 * protection against faulty packet - there should be 738 * more sanity checks in header chain processing. 739 */ 740 if (m->m_pkthdr.len < off) { 741 IP6_STATINC(IP6_STAT_TOOSHORT); 742 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 743 goto bad; 744 } 745 746 if (nxt == IPPROTO_ROUTING) { 747 if (rh_present++) { 748 in6_ifstat_inc(m->m_pkthdr.rcvif, 749 ifs6_in_hdrerr); 750 IP6_STATINC(IP6_STAT_BADOPTIONS); 751 goto bad; 752 } 753 } 754 755 #ifdef IPSEC 756 /* 757 * enforce IPsec policy checking if we are seeing last header. 758 * note that we do not visit this with protocols with pcb layer 759 * code - like udp/tcp/raw ip. 760 */ 761 if ((inet6sw[ip_protox[nxt]].pr_flags & PR_LASTHDR) != 0) { 762 /* 763 * Check if the packet has already had IPsec processing 764 * done. If so, then just pass it along. This tag gets 765 * set during AH, ESP, etc. input handling, before the 766 * packet is returned to the ip input queue for delivery. 767 */ 768 mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL); 769 s = splsoftnet(); 770 if (mtag != NULL) { 771 tdbi = (struct tdb_ident *)(mtag + 1); 772 sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND); 773 } else { 774 sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, 775 IP_FORWARDING, &error); 776 } 777 if (sp != NULL) { 778 /* 779 * Check security policy against packet attributes. 780 */ 781 error = ipsec_in_reject(sp, m); 782 KEY_FREESP(&sp); 783 } else { 784 /* XXX error stat??? */ 785 error = EINVAL; 786 DPRINTF(("ip6_input: no SP, packet discarded\n"));/*XXX*/ 787 } 788 splx(s); 789 if (error) 790 goto bad; 791 } 792 #endif /* IPSEC */ 793 794 795 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt); 796 } 797 return; 798 bad: 799 m_freem(m); 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; 809 810 mtag = ip6_addaux(m); 811 if (mtag != NULL) { 812 struct ip6aux *ip6a; 813 814 ip6a = (struct ip6aux *)(mtag + 1); 815 in6_setscope(&ip6a->ip6a_src, ia->ia_ifp, &ip6a->ip6a_scope_id); 816 ip6a->ip6a_src = ia->ia_addr.sin6_addr; 817 ip6a->ip6a_flags = ia->ia6_flags; 818 } 819 return mtag; /* NULL if failed to set */ 820 } 821 822 const struct ip6aux * 823 ip6_getdstifaddr(struct mbuf *m) 824 { 825 struct m_tag *mtag; 826 827 mtag = ip6_findaux(m); 828 if (mtag != NULL) 829 return (struct ip6aux *)(mtag + 1); 830 else 831 return NULL; 832 } 833 834 /* 835 * Hop-by-Hop options header processing. If a valid jumbo payload option is 836 * included, the real payload length will be stored in plenp. 837 * 838 * rtalertp - XXX: should be stored more smart way 839 */ 840 int 841 ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp, 842 struct mbuf **mp, int *offp) 843 { 844 struct mbuf *m = *mp; 845 int off = *offp, hbhlen; 846 struct ip6_hbh *hbh; 847 848 /* validation of the length of the header */ 849 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, 850 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh)); 851 if (hbh == NULL) { 852 IP6_STATINC(IP6_STAT_TOOSHORT); 853 return -1; 854 } 855 hbhlen = (hbh->ip6h_len + 1) << 3; 856 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 857 hbhlen); 858 if (hbh == NULL) { 859 IP6_STATINC(IP6_STAT_TOOSHORT); 860 return -1; 861 } 862 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 863 off += hbhlen; 864 hbhlen -= sizeof(struct ip6_hbh); 865 866 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 867 hbhlen, rtalertp, plenp) < 0) 868 return (-1); 869 870 *offp = off; 871 *mp = m; 872 return (0); 873 } 874 875 /* 876 * Search header for all Hop-by-hop options and process each option. 877 * This function is separate from ip6_hopopts_input() in order to 878 * handle a case where the sending node itself process its hop-by-hop 879 * options header. In such a case, the function is called from ip6_output(). 880 * 881 * The function assumes that hbh header is located right after the IPv6 header 882 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to 883 * opthead + hbhlen is located in continuous memory region. 884 */ 885 static int 886 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen, 887 u_int32_t *rtalertp, u_int32_t *plenp) 888 { 889 struct ip6_hdr *ip6; 890 int optlen = 0; 891 u_int8_t *opt = opthead; 892 u_int16_t rtalert_val; 893 u_int32_t jumboplen; 894 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh); 895 896 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 897 switch (*opt) { 898 case IP6OPT_PAD1: 899 optlen = 1; 900 break; 901 case IP6OPT_PADN: 902 if (hbhlen < IP6OPT_MINLEN) { 903 IP6_STATINC(IP6_STAT_TOOSMALL); 904 goto bad; 905 } 906 optlen = *(opt + 1) + 2; 907 break; 908 case IP6OPT_RTALERT: 909 /* XXX may need check for alignment */ 910 if (hbhlen < IP6OPT_RTALERT_LEN) { 911 IP6_STATINC(IP6_STAT_TOOSMALL); 912 goto bad; 913 } 914 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) { 915 /* XXX stat */ 916 icmp6_error(m, ICMP6_PARAM_PROB, 917 ICMP6_PARAMPROB_HEADER, 918 erroff + opt + 1 - opthead); 919 return (-1); 920 } 921 optlen = IP6OPT_RTALERT_LEN; 922 memcpy((void *)&rtalert_val, (void *)(opt + 2), 2); 923 *rtalertp = ntohs(rtalert_val); 924 break; 925 case IP6OPT_JUMBO: 926 /* XXX may need check for alignment */ 927 if (hbhlen < IP6OPT_JUMBO_LEN) { 928 IP6_STATINC(IP6_STAT_TOOSMALL); 929 goto bad; 930 } 931 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) { 932 /* XXX stat */ 933 icmp6_error(m, ICMP6_PARAM_PROB, 934 ICMP6_PARAMPROB_HEADER, 935 erroff + opt + 1 - opthead); 936 return (-1); 937 } 938 optlen = IP6OPT_JUMBO_LEN; 939 940 /* 941 * IPv6 packets that have non 0 payload length 942 * must not contain a jumbo payload option. 943 */ 944 ip6 = mtod(m, struct ip6_hdr *); 945 if (ip6->ip6_plen) { 946 IP6_STATINC(IP6_STAT_BADOPTIONS); 947 icmp6_error(m, ICMP6_PARAM_PROB, 948 ICMP6_PARAMPROB_HEADER, 949 erroff + opt - opthead); 950 return (-1); 951 } 952 953 /* 954 * We may see jumbolen in unaligned location, so 955 * we'd need to perform bcopy(). 956 */ 957 memcpy(&jumboplen, opt + 2, sizeof(jumboplen)); 958 jumboplen = (u_int32_t)htonl(jumboplen); 959 960 #if 1 961 /* 962 * if there are multiple jumbo payload options, 963 * *plenp will be non-zero and the packet will be 964 * rejected. 965 * the behavior may need some debate in ipngwg - 966 * multiple options does not make sense, however, 967 * there's no explicit mention in specification. 968 */ 969 if (*plenp != 0) { 970 IP6_STATINC(IP6_STAT_BADOPTIONS); 971 icmp6_error(m, ICMP6_PARAM_PROB, 972 ICMP6_PARAMPROB_HEADER, 973 erroff + opt + 2 - opthead); 974 return (-1); 975 } 976 #endif 977 978 /* 979 * jumbo payload length must be larger than 65535. 980 */ 981 if (jumboplen <= IPV6_MAXPACKET) { 982 IP6_STATINC(IP6_STAT_BADOPTIONS); 983 icmp6_error(m, ICMP6_PARAM_PROB, 984 ICMP6_PARAMPROB_HEADER, 985 erroff + opt + 2 - opthead); 986 return (-1); 987 } 988 *plenp = jumboplen; 989 990 break; 991 default: /* unknown option */ 992 if (hbhlen < IP6OPT_MINLEN) { 993 IP6_STATINC(IP6_STAT_TOOSMALL); 994 goto bad; 995 } 996 optlen = ip6_unknown_opt(opt, m, 997 erroff + opt - opthead); 998 if (optlen == -1) 999 return (-1); 1000 optlen += 2; 1001 break; 1002 } 1003 } 1004 1005 return (0); 1006 1007 bad: 1008 m_freem(m); 1009 return (-1); 1010 } 1011 1012 /* 1013 * Unknown option processing. 1014 * The third argument `off' is the offset from the IPv6 header to the option, 1015 * which is necessary if the IPv6 header the and option header and IPv6 header 1016 * is not continuous in order to return an ICMPv6 error. 1017 */ 1018 int 1019 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off) 1020 { 1021 struct ip6_hdr *ip6; 1022 1023 switch (IP6OPT_TYPE(*optp)) { 1024 case IP6OPT_TYPE_SKIP: /* ignore the option */ 1025 return ((int)*(optp + 1)); 1026 case IP6OPT_TYPE_DISCARD: /* silently discard */ 1027 m_freem(m); 1028 return (-1); 1029 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 1030 IP6_STATINC(IP6_STAT_BADOPTIONS); 1031 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 1032 return (-1); 1033 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 1034 IP6_STATINC(IP6_STAT_BADOPTIONS); 1035 ip6 = mtod(m, struct ip6_hdr *); 1036 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 1037 (m->m_flags & (M_BCAST|M_MCAST))) 1038 m_freem(m); 1039 else 1040 icmp6_error(m, ICMP6_PARAM_PROB, 1041 ICMP6_PARAMPROB_OPTION, off); 1042 return (-1); 1043 } 1044 1045 m_freem(m); /* XXX: NOTREACHED */ 1046 return (-1); 1047 } 1048 1049 /* 1050 * Create the "control" list for this pcb. 1051 * 1052 * The routine will be called from upper layer handlers like tcp6_input(). 1053 * Thus the routine assumes that the caller (tcp6_input) have already 1054 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the 1055 * very first mbuf on the mbuf chain. 1056 * We may want to add some infinite loop prevention or sanity checks for safety. 1057 * (This applies only when you are using KAME mbuf chain restriction, i.e. 1058 * you are using IP6_EXTHDR_CHECK() not m_pulldown()) 1059 */ 1060 void 1061 ip6_savecontrol(struct in6pcb *in6p, struct mbuf **mp, 1062 struct ip6_hdr *ip6, struct mbuf *m) 1063 { 1064 #ifdef RFC2292 1065 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y)) 1066 #else 1067 #define IS2292(x, y) (y) 1068 #endif 1069 1070 if (in6p->in6p_socket->so_options & SO_TIMESTAMP 1071 #ifdef SO_OTIMESTAMP 1072 || in6p->in6p_socket->so_options & SO_OTIMESTAMP 1073 #endif 1074 ) { 1075 struct timeval tv; 1076 1077 microtime(&tv); 1078 #ifdef SO_OTIMESTAMP 1079 if (in6p->in6p_socket->so_options & SO_OTIMESTAMP) { 1080 struct timeval50 tv50; 1081 timeval_to_timeval50(&tv, &tv50); 1082 *mp = sbcreatecontrol((void *) &tv50, sizeof(tv50), 1083 SCM_OTIMESTAMP, SOL_SOCKET); 1084 } else 1085 #endif 1086 *mp = sbcreatecontrol((void *) &tv, sizeof(tv), 1087 SCM_TIMESTAMP, SOL_SOCKET); 1088 if (*mp) 1089 mp = &(*mp)->m_next; 1090 } 1091 1092 /* some OSes call this logic with IPv4 packet, for SO_TIMESTAMP */ 1093 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) 1094 return; 1095 1096 /* RFC 2292 sec. 5 */ 1097 if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) { 1098 struct in6_pktinfo pi6; 1099 1100 memcpy(&pi6.ipi6_addr, &ip6->ip6_dst, sizeof(struct in6_addr)); 1101 in6_clearscope(&pi6.ipi6_addr); /* XXX */ 1102 pi6.ipi6_ifindex = m->m_pkthdr.rcvif ? 1103 m->m_pkthdr.rcvif->if_index : 0; 1104 *mp = sbcreatecontrol((void *) &pi6, 1105 sizeof(struct in6_pktinfo), 1106 IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6); 1107 if (*mp) 1108 mp = &(*mp)->m_next; 1109 } 1110 1111 if (in6p->in6p_flags & IN6P_HOPLIMIT) { 1112 int hlim = ip6->ip6_hlim & 0xff; 1113 1114 *mp = sbcreatecontrol((void *) &hlim, sizeof(int), 1115 IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6); 1116 if (*mp) 1117 mp = &(*mp)->m_next; 1118 } 1119 1120 if ((in6p->in6p_flags & IN6P_TCLASS) != 0) { 1121 u_int32_t flowinfo; 1122 int tclass; 1123 1124 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK); 1125 flowinfo >>= 20; 1126 1127 tclass = flowinfo & 0xff; 1128 *mp = sbcreatecontrol((void *)&tclass, sizeof(tclass), 1129 IPV6_TCLASS, IPPROTO_IPV6); 1130 1131 if (*mp) 1132 mp = &(*mp)->m_next; 1133 } 1134 1135 /* 1136 * IPV6_HOPOPTS socket option. Recall that we required super-user 1137 * privilege for the option (see ip6_ctloutput), but it might be too 1138 * strict, since there might be some hop-by-hop options which can be 1139 * returned to normal user. 1140 * See also RFC3542 section 8 (or RFC2292 section 6). 1141 */ 1142 if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0) { 1143 /* 1144 * Check if a hop-by-hop options header is contatined in the 1145 * received packet, and if so, store the options as ancillary 1146 * data. Note that a hop-by-hop options header must be 1147 * just after the IPv6 header, which fact is assured through 1148 * the IPv6 input processing. 1149 */ 1150 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1151 if (xip6->ip6_nxt == IPPROTO_HOPOPTS) { 1152 struct ip6_hbh *hbh; 1153 int hbhlen; 1154 struct mbuf *ext; 1155 1156 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr), 1157 xip6->ip6_nxt); 1158 if (ext == NULL) { 1159 IP6_STATINC(IP6_STAT_TOOSHORT); 1160 return; 1161 } 1162 hbh = mtod(ext, struct ip6_hbh *); 1163 hbhlen = (hbh->ip6h_len + 1) << 3; 1164 if (hbhlen != ext->m_len) { 1165 m_freem(ext); 1166 IP6_STATINC(IP6_STAT_TOOSHORT); 1167 return; 1168 } 1169 1170 /* 1171 * XXX: We copy whole the header even if a jumbo 1172 * payload option is included, which option is to 1173 * be removed before returning in the RFC 2292. 1174 * Note: this constraint is removed in RFC3542. 1175 */ 1176 *mp = sbcreatecontrol((void *)hbh, hbhlen, 1177 IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS), 1178 IPPROTO_IPV6); 1179 if (*mp) 1180 mp = &(*mp)->m_next; 1181 m_freem(ext); 1182 } 1183 } 1184 1185 /* IPV6_DSTOPTS and IPV6_RTHDR socket options */ 1186 if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) { 1187 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1188 int nxt = xip6->ip6_nxt, off = sizeof(struct ip6_hdr); 1189 1190 /* 1191 * Search for destination options headers or routing 1192 * header(s) through the header chain, and stores each 1193 * header as ancillary data. 1194 * Note that the order of the headers remains in 1195 * the chain of ancillary data. 1196 */ 1197 for (;;) { /* is explicit loop prevention necessary? */ 1198 struct ip6_ext *ip6e = NULL; 1199 int elen; 1200 struct mbuf *ext = NULL; 1201 1202 /* 1203 * if it is not an extension header, don't try to 1204 * pull it from the chain. 1205 */ 1206 switch (nxt) { 1207 case IPPROTO_DSTOPTS: 1208 case IPPROTO_ROUTING: 1209 case IPPROTO_HOPOPTS: 1210 case IPPROTO_AH: /* is it possible? */ 1211 break; 1212 default: 1213 goto loopend; 1214 } 1215 1216 ext = ip6_pullexthdr(m, off, nxt); 1217 if (ext == NULL) { 1218 IP6_STATINC(IP6_STAT_TOOSHORT); 1219 return; 1220 } 1221 ip6e = mtod(ext, struct ip6_ext *); 1222 if (nxt == IPPROTO_AH) 1223 elen = (ip6e->ip6e_len + 2) << 2; 1224 else 1225 elen = (ip6e->ip6e_len + 1) << 3; 1226 if (elen != ext->m_len) { 1227 m_freem(ext); 1228 IP6_STATINC(IP6_STAT_TOOSHORT); 1229 return; 1230 } 1231 KASSERT(IP6_HDR_ALIGNED_P(ip6e)); 1232 1233 switch (nxt) { 1234 case IPPROTO_DSTOPTS: 1235 if (!(in6p->in6p_flags & IN6P_DSTOPTS)) 1236 break; 1237 1238 *mp = sbcreatecontrol((void *)ip6e, elen, 1239 IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS), 1240 IPPROTO_IPV6); 1241 if (*mp) 1242 mp = &(*mp)->m_next; 1243 break; 1244 1245 case IPPROTO_ROUTING: 1246 if (!(in6p->in6p_flags & IN6P_RTHDR)) 1247 break; 1248 1249 *mp = sbcreatecontrol((void *)ip6e, elen, 1250 IS2292(IPV6_2292RTHDR, IPV6_RTHDR), 1251 IPPROTO_IPV6); 1252 if (*mp) 1253 mp = &(*mp)->m_next; 1254 break; 1255 1256 case IPPROTO_HOPOPTS: 1257 case IPPROTO_AH: /* is it possible? */ 1258 break; 1259 1260 default: 1261 /* 1262 * other cases have been filtered in the above. 1263 * none will visit this case. here we supply 1264 * the code just in case (nxt overwritten or 1265 * other cases). 1266 */ 1267 m_freem(ext); 1268 goto loopend; 1269 1270 } 1271 1272 /* proceed with the next header. */ 1273 off += elen; 1274 nxt = ip6e->ip6e_nxt; 1275 ip6e = NULL; 1276 m_freem(ext); 1277 ext = NULL; 1278 } 1279 loopend: 1280 ; 1281 } 1282 } 1283 #undef IS2292 1284 1285 1286 void 1287 ip6_notify_pmtu(struct in6pcb *in6p, const struct sockaddr_in6 *dst, 1288 uint32_t *mtu) 1289 { 1290 struct socket *so; 1291 struct mbuf *m_mtu; 1292 struct ip6_mtuinfo mtuctl; 1293 1294 so = in6p->in6p_socket; 1295 1296 if (mtu == NULL) 1297 return; 1298 1299 #ifdef DIAGNOSTIC 1300 if (so == NULL) /* I believe this is impossible */ 1301 panic("ip6_notify_pmtu: socket is NULL"); 1302 #endif 1303 1304 memset(&mtuctl, 0, sizeof(mtuctl)); /* zero-clear for safety */ 1305 mtuctl.ip6m_mtu = *mtu; 1306 mtuctl.ip6m_addr = *dst; 1307 if (sa6_recoverscope(&mtuctl.ip6m_addr)) 1308 return; 1309 1310 if ((m_mtu = sbcreatecontrol((void *)&mtuctl, sizeof(mtuctl), 1311 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL) 1312 return; 1313 1314 if (sbappendaddr(&so->so_rcv, (const struct sockaddr *)dst, NULL, m_mtu) 1315 == 0) { 1316 m_freem(m_mtu); 1317 /* XXX: should count statistics */ 1318 } else 1319 sorwakeup(so); 1320 1321 return; 1322 } 1323 1324 /* 1325 * pull single extension header from mbuf chain. returns single mbuf that 1326 * contains the result, or NULL on error. 1327 */ 1328 static struct mbuf * 1329 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt) 1330 { 1331 struct ip6_ext ip6e; 1332 size_t elen; 1333 struct mbuf *n; 1334 1335 #ifdef DIAGNOSTIC 1336 switch (nxt) { 1337 case IPPROTO_DSTOPTS: 1338 case IPPROTO_ROUTING: 1339 case IPPROTO_HOPOPTS: 1340 case IPPROTO_AH: /* is it possible? */ 1341 break; 1342 default: 1343 printf("ip6_pullexthdr: invalid nxt=%d\n", nxt); 1344 } 1345 #endif 1346 1347 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1348 if (nxt == IPPROTO_AH) 1349 elen = (ip6e.ip6e_len + 2) << 2; 1350 else 1351 elen = (ip6e.ip6e_len + 1) << 3; 1352 1353 MGET(n, M_DONTWAIT, MT_DATA); 1354 if (n && elen >= MLEN) { 1355 MCLGET(n, M_DONTWAIT); 1356 if ((n->m_flags & M_EXT) == 0) { 1357 m_free(n); 1358 n = NULL; 1359 } 1360 } 1361 if (!n) 1362 return NULL; 1363 1364 n->m_len = 0; 1365 if (elen >= M_TRAILINGSPACE(n)) { 1366 m_free(n); 1367 return NULL; 1368 } 1369 1370 m_copydata(m, off, elen, mtod(n, void *)); 1371 n->m_len = elen; 1372 return n; 1373 } 1374 1375 /* 1376 * Get pointer to the previous header followed by the header 1377 * currently processed. 1378 * XXX: This function supposes that 1379 * M includes all headers, 1380 * the next header field and the header length field of each header 1381 * are valid, and 1382 * the sum of each header length equals to OFF. 1383 * Because of these assumptions, this function must be called very 1384 * carefully. Moreover, it will not be used in the near future when 1385 * we develop `neater' mechanism to process extension headers. 1386 */ 1387 u_int8_t * 1388 ip6_get_prevhdr(struct mbuf *m, int off) 1389 { 1390 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1391 1392 if (off == sizeof(struct ip6_hdr)) 1393 return (&ip6->ip6_nxt); 1394 else { 1395 int len, nxt; 1396 struct ip6_ext *ip6e = NULL; 1397 1398 nxt = ip6->ip6_nxt; 1399 len = sizeof(struct ip6_hdr); 1400 while (len < off) { 1401 ip6e = (struct ip6_ext *)(mtod(m, char *) + len); 1402 1403 switch (nxt) { 1404 case IPPROTO_FRAGMENT: 1405 len += sizeof(struct ip6_frag); 1406 break; 1407 case IPPROTO_AH: 1408 len += (ip6e->ip6e_len + 2) << 2; 1409 break; 1410 default: 1411 len += (ip6e->ip6e_len + 1) << 3; 1412 break; 1413 } 1414 nxt = ip6e->ip6e_nxt; 1415 } 1416 if (ip6e) 1417 return (&ip6e->ip6e_nxt); 1418 else 1419 return NULL; 1420 } 1421 } 1422 1423 /* 1424 * get next header offset. m will be retained. 1425 */ 1426 int 1427 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp) 1428 { 1429 struct ip6_hdr ip6; 1430 struct ip6_ext ip6e; 1431 struct ip6_frag fh; 1432 1433 /* just in case */ 1434 if (m == NULL) 1435 panic("ip6_nexthdr: m == NULL"); 1436 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off) 1437 return -1; 1438 1439 switch (proto) { 1440 case IPPROTO_IPV6: 1441 /* do not chase beyond intermediate IPv6 headers */ 1442 if (off != 0) 1443 return -1; 1444 if (m->m_pkthdr.len < off + sizeof(ip6)) 1445 return -1; 1446 m_copydata(m, off, sizeof(ip6), (void *)&ip6); 1447 if (nxtp) 1448 *nxtp = ip6.ip6_nxt; 1449 off += sizeof(ip6); 1450 return off; 1451 1452 case IPPROTO_FRAGMENT: 1453 /* 1454 * terminate parsing if it is not the first fragment, 1455 * it does not make sense to parse through it. 1456 */ 1457 if (m->m_pkthdr.len < off + sizeof(fh)) 1458 return -1; 1459 m_copydata(m, off, sizeof(fh), (void *)&fh); 1460 if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0) 1461 return -1; 1462 if (nxtp) 1463 *nxtp = fh.ip6f_nxt; 1464 off += sizeof(struct ip6_frag); 1465 return off; 1466 1467 case IPPROTO_AH: 1468 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1469 return -1; 1470 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1471 if (nxtp) 1472 *nxtp = ip6e.ip6e_nxt; 1473 off += (ip6e.ip6e_len + 2) << 2; 1474 if (m->m_pkthdr.len < off) 1475 return -1; 1476 return off; 1477 1478 case IPPROTO_HOPOPTS: 1479 case IPPROTO_ROUTING: 1480 case IPPROTO_DSTOPTS: 1481 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1482 return -1; 1483 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1484 if (nxtp) 1485 *nxtp = ip6e.ip6e_nxt; 1486 off += (ip6e.ip6e_len + 1) << 3; 1487 if (m->m_pkthdr.len < off) 1488 return -1; 1489 return off; 1490 1491 case IPPROTO_NONE: 1492 case IPPROTO_ESP: 1493 case IPPROTO_IPCOMP: 1494 /* give up */ 1495 return -1; 1496 1497 default: 1498 return -1; 1499 } 1500 } 1501 1502 /* 1503 * get offset for the last header in the chain. m will be kept untainted. 1504 */ 1505 int 1506 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp) 1507 { 1508 int newoff; 1509 int nxt; 1510 1511 if (!nxtp) { 1512 nxt = -1; 1513 nxtp = &nxt; 1514 } 1515 for (;;) { 1516 newoff = ip6_nexthdr(m, off, proto, nxtp); 1517 if (newoff < 0) 1518 return off; 1519 else if (newoff < off) 1520 return -1; /* invalid */ 1521 else if (newoff == off) 1522 return newoff; 1523 1524 off = newoff; 1525 proto = *nxtp; 1526 } 1527 } 1528 1529 struct m_tag * 1530 ip6_addaux(struct mbuf *m) 1531 { 1532 struct m_tag *mtag; 1533 1534 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1535 if (!mtag) { 1536 mtag = m_tag_get(PACKET_TAG_INET6, sizeof(struct ip6aux), 1537 M_NOWAIT); 1538 if (mtag) { 1539 m_tag_prepend(m, mtag); 1540 memset(mtag + 1, 0, sizeof(struct ip6aux)); 1541 } 1542 } 1543 return mtag; 1544 } 1545 1546 struct m_tag * 1547 ip6_findaux(struct mbuf *m) 1548 { 1549 struct m_tag *mtag; 1550 1551 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1552 return mtag; 1553 } 1554 1555 void 1556 ip6_delaux(struct mbuf *m) 1557 { 1558 struct m_tag *mtag; 1559 1560 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1561 if (mtag) 1562 m_tag_delete(m, mtag); 1563 } 1564 1565 #ifdef GATEWAY 1566 /* 1567 * sysctl helper routine for net.inet.ip6.maxflows. Since 1568 * we could reduce this value, call ip6flow_reap(); 1569 */ 1570 static int 1571 sysctl_net_inet6_ip6_maxflows(SYSCTLFN_ARGS) 1572 { 1573 int error; 1574 1575 error = sysctl_lookup(SYSCTLFN_CALL(rnode)); 1576 if (error || newp == NULL) 1577 return (error); 1578 1579 mutex_enter(softnet_lock); 1580 KERNEL_LOCK(1, NULL); 1581 1582 ip6flow_reap(0); 1583 1584 KERNEL_UNLOCK_ONE(NULL); 1585 mutex_exit(softnet_lock); 1586 1587 return (0); 1588 } 1589 1590 static int 1591 sysctl_net_inet6_ip6_hashsize(SYSCTLFN_ARGS) 1592 { 1593 int error, tmp; 1594 struct sysctlnode node; 1595 1596 node = *rnode; 1597 tmp = ip6_hashsize; 1598 node.sysctl_data = &tmp; 1599 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 1600 if (error || newp == NULL) 1601 return (error); 1602 1603 if ((tmp & (tmp - 1)) == 0 && tmp != 0) { 1604 /* 1605 * Can only fail due to malloc() 1606 */ 1607 mutex_enter(softnet_lock); 1608 KERNEL_LOCK(1, NULL); 1609 1610 error = ip6flow_invalidate_all(tmp); 1611 1612 KERNEL_UNLOCK_ONE(NULL); 1613 mutex_exit(softnet_lock); 1614 } else { 1615 /* 1616 * EINVAL if not a power of 2 1617 */ 1618 error = EINVAL; 1619 } 1620 1621 return error; 1622 } 1623 #endif /* GATEWAY */ 1624 1625 /* 1626 * System control for IP6 1627 */ 1628 1629 const u_char inet6ctlerrmap[PRC_NCMDS] = { 1630 0, 0, 0, 0, 1631 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 1632 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 1633 EMSGSIZE, EHOSTUNREACH, 0, 0, 1634 0, 0, 0, 0, 1635 ENOPROTOOPT 1636 }; 1637 1638 static int 1639 sysctl_net_inet6_ip6_stats(SYSCTLFN_ARGS) 1640 { 1641 1642 return (NETSTAT_SYSCTL(ip6stat_percpu, IP6_NSTATS)); 1643 } 1644 1645 static void 1646 sysctl_net_inet6_ip6_setup(struct sysctllog **clog) 1647 { 1648 #ifdef RFC2292 1649 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y)) 1650 #else 1651 #define IS2292(x, y) (y) 1652 #endif 1653 1654 sysctl_createv(clog, 0, NULL, NULL, 1655 CTLFLAG_PERMANENT, 1656 CTLTYPE_NODE, "net", NULL, 1657 NULL, 0, NULL, 0, 1658 CTL_NET, CTL_EOL); 1659 sysctl_createv(clog, 0, NULL, NULL, 1660 CTLFLAG_PERMANENT, 1661 CTLTYPE_NODE, "inet6", 1662 SYSCTL_DESCR("PF_INET6 related settings"), 1663 NULL, 0, NULL, 0, 1664 CTL_NET, PF_INET6, CTL_EOL); 1665 sysctl_createv(clog, 0, NULL, NULL, 1666 CTLFLAG_PERMANENT, 1667 CTLTYPE_NODE, "ip6", 1668 SYSCTL_DESCR("IPv6 related settings"), 1669 NULL, 0, NULL, 0, 1670 CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_EOL); 1671 1672 sysctl_createv(clog, 0, NULL, NULL, 1673 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1674 CTLTYPE_INT, "forwarding", 1675 SYSCTL_DESCR("Enable forwarding of INET6 datagrams"), 1676 NULL, 0, &ip6_forwarding, 0, 1677 CTL_NET, PF_INET6, IPPROTO_IPV6, 1678 IPV6CTL_FORWARDING, CTL_EOL); 1679 sysctl_createv(clog, 0, NULL, NULL, 1680 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1681 CTLTYPE_INT, "redirect", 1682 SYSCTL_DESCR("Enable sending of ICMPv6 redirect messages"), 1683 NULL, 0, &ip6_sendredirects, 0, 1684 CTL_NET, PF_INET6, IPPROTO_IPV6, 1685 IPV6CTL_SENDREDIRECTS, CTL_EOL); 1686 sysctl_createv(clog, 0, NULL, NULL, 1687 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1688 CTLTYPE_INT, "hlim", 1689 SYSCTL_DESCR("Hop limit for an INET6 datagram"), 1690 NULL, 0, &ip6_defhlim, 0, 1691 CTL_NET, PF_INET6, IPPROTO_IPV6, 1692 IPV6CTL_DEFHLIM, CTL_EOL); 1693 #ifdef notyet 1694 sysctl_createv(clog, 0, NULL, NULL, 1695 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1696 CTLTYPE_INT, "mtu", NULL, 1697 NULL, 0, &, 0, 1698 CTL_NET, PF_INET6, IPPROTO_IPV6, 1699 IPV6CTL_DEFMTU, CTL_EOL); 1700 #endif 1701 #ifdef __no_idea__ 1702 sysctl_createv(clog, 0, NULL, NULL, 1703 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1704 CTLTYPE_INT, "forwsrcrt", NULL, 1705 NULL, 0, &?, 0, 1706 CTL_NET, PF_INET6, IPPROTO_IPV6, 1707 IPV6CTL_FORWSRCRT, CTL_EOL); 1708 sysctl_createv(clog, 0, NULL, NULL, 1709 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1710 CTLTYPE_STRUCT, "mrtstats", NULL, 1711 NULL, 0, &?, sizeof(?), 1712 CTL_NET, PF_INET6, IPPROTO_IPV6, 1713 IPV6CTL_MRTSTATS, CTL_EOL); 1714 sysctl_createv(clog, 0, NULL, NULL, 1715 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1716 CTLTYPE_?, "mrtproto", NULL, 1717 NULL, 0, &?, sizeof(?), 1718 CTL_NET, PF_INET6, IPPROTO_IPV6, 1719 IPV6CTL_MRTPROTO, CTL_EOL); 1720 #endif 1721 sysctl_createv(clog, 0, NULL, NULL, 1722 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1723 CTLTYPE_INT, "maxfragpackets", 1724 SYSCTL_DESCR("Maximum number of fragments to buffer " 1725 "for reassembly"), 1726 NULL, 0, &ip6_maxfragpackets, 0, 1727 CTL_NET, PF_INET6, IPPROTO_IPV6, 1728 IPV6CTL_MAXFRAGPACKETS, CTL_EOL); 1729 #ifdef __no_idea__ 1730 sysctl_createv(clog, 0, NULL, NULL, 1731 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1732 CTLTYPE_INT, "sourcecheck", NULL, 1733 NULL, 0, &?, 0, 1734 CTL_NET, PF_INET6, IPPROTO_IPV6, 1735 IPV6CTL_SOURCECHECK, CTL_EOL); 1736 sysctl_createv(clog, 0, NULL, NULL, 1737 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1738 CTLTYPE_INT, "sourcecheck_logint", NULL, 1739 NULL, 0, &?, 0, 1740 CTL_NET, PF_INET6, IPPROTO_IPV6, 1741 IPV6CTL_SOURCECHECK_LOGINT, CTL_EOL); 1742 #endif 1743 sysctl_createv(clog, 0, NULL, NULL, 1744 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1745 CTLTYPE_INT, "accept_rtadv", 1746 SYSCTL_DESCR("Accept router advertisements"), 1747 NULL, 0, &ip6_accept_rtadv, 0, 1748 CTL_NET, PF_INET6, IPPROTO_IPV6, 1749 IPV6CTL_ACCEPT_RTADV, CTL_EOL); 1750 sysctl_createv(clog, 0, NULL, NULL, 1751 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1752 CTLTYPE_INT, "rtadv_maxroutes", 1753 SYSCTL_DESCR("Maximum number of routes accepted via router advertisements"), 1754 NULL, 0, &ip6_rtadv_maxroutes, 0, 1755 CTL_NET, PF_INET6, IPPROTO_IPV6, 1756 IPV6CTL_RTADV_MAXROUTES, CTL_EOL); 1757 sysctl_createv(clog, 0, NULL, NULL, 1758 CTLFLAG_PERMANENT, 1759 CTLTYPE_INT, "rtadv_numroutes", 1760 SYSCTL_DESCR("Current number of routes accepted via router advertisements"), 1761 NULL, 0, &nd6_numroutes, 0, 1762 CTL_NET, PF_INET6, IPPROTO_IPV6, 1763 IPV6CTL_RTADV_NUMROUTES, CTL_EOL); 1764 sysctl_createv(clog, 0, NULL, NULL, 1765 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1766 CTLTYPE_INT, "keepfaith", 1767 SYSCTL_DESCR("Activate faith interface"), 1768 NULL, 0, &ip6_keepfaith, 0, 1769 CTL_NET, PF_INET6, IPPROTO_IPV6, 1770 IPV6CTL_KEEPFAITH, CTL_EOL); 1771 sysctl_createv(clog, 0, NULL, NULL, 1772 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1773 CTLTYPE_INT, "log_interval", 1774 SYSCTL_DESCR("Minumum interval between logging " 1775 "unroutable packets"), 1776 NULL, 0, &ip6_log_interval, 0, 1777 CTL_NET, PF_INET6, IPPROTO_IPV6, 1778 IPV6CTL_LOG_INTERVAL, CTL_EOL); 1779 sysctl_createv(clog, 0, NULL, NULL, 1780 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1781 CTLTYPE_INT, "hdrnestlimit", 1782 SYSCTL_DESCR("Maximum number of nested IPv6 headers"), 1783 NULL, 0, &ip6_hdrnestlimit, 0, 1784 CTL_NET, PF_INET6, IPPROTO_IPV6, 1785 IPV6CTL_HDRNESTLIMIT, CTL_EOL); 1786 sysctl_createv(clog, 0, NULL, NULL, 1787 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1788 CTLTYPE_INT, "dad_count", 1789 SYSCTL_DESCR("Number of Duplicate Address Detection " 1790 "probes to send"), 1791 NULL, 0, &ip6_dad_count, 0, 1792 CTL_NET, PF_INET6, IPPROTO_IPV6, 1793 IPV6CTL_DAD_COUNT, CTL_EOL); 1794 sysctl_createv(clog, 0, NULL, NULL, 1795 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1796 CTLTYPE_INT, "auto_flowlabel", 1797 SYSCTL_DESCR("Assign random IPv6 flow labels"), 1798 NULL, 0, &ip6_auto_flowlabel, 0, 1799 CTL_NET, PF_INET6, IPPROTO_IPV6, 1800 IPV6CTL_AUTO_FLOWLABEL, CTL_EOL); 1801 sysctl_createv(clog, 0, NULL, NULL, 1802 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1803 CTLTYPE_INT, "defmcasthlim", 1804 SYSCTL_DESCR("Default multicast hop limit"), 1805 NULL, 0, &ip6_defmcasthlim, 0, 1806 CTL_NET, PF_INET6, IPPROTO_IPV6, 1807 IPV6CTL_DEFMCASTHLIM, CTL_EOL); 1808 #if NGIF > 0 1809 sysctl_createv(clog, 0, NULL, NULL, 1810 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1811 CTLTYPE_INT, "gifhlim", 1812 SYSCTL_DESCR("Default hop limit for a gif tunnel datagram"), 1813 NULL, 0, &ip6_gif_hlim, 0, 1814 CTL_NET, PF_INET6, IPPROTO_IPV6, 1815 IPV6CTL_GIF_HLIM, CTL_EOL); 1816 #endif /* NGIF */ 1817 sysctl_createv(clog, 0, NULL, NULL, 1818 CTLFLAG_PERMANENT, 1819 CTLTYPE_STRING, "kame_version", 1820 SYSCTL_DESCR("KAME Version"), 1821 NULL, 0, __UNCONST(__KAME_VERSION), 0, 1822 CTL_NET, PF_INET6, IPPROTO_IPV6, 1823 IPV6CTL_KAME_VERSION, CTL_EOL); 1824 sysctl_createv(clog, 0, NULL, NULL, 1825 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1826 CTLTYPE_INT, "use_deprecated", 1827 SYSCTL_DESCR("Allow use of deprecated addresses as " 1828 "source addresses"), 1829 NULL, 0, &ip6_use_deprecated, 0, 1830 CTL_NET, PF_INET6, IPPROTO_IPV6, 1831 IPV6CTL_USE_DEPRECATED, CTL_EOL); 1832 sysctl_createv(clog, 0, NULL, NULL, 1833 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1834 CTLTYPE_INT, "rr_prune", NULL, 1835 NULL, 0, &ip6_rr_prune, 0, 1836 CTL_NET, PF_INET6, IPPROTO_IPV6, 1837 IPV6CTL_RR_PRUNE, CTL_EOL); 1838 sysctl_createv(clog, 0, NULL, NULL, 1839 CTLFLAG_PERMANENT 1840 #ifndef INET6_BINDV6ONLY 1841 |CTLFLAG_READWRITE, 1842 #endif 1843 CTLTYPE_INT, "v6only", 1844 SYSCTL_DESCR("Disallow PF_INET6 sockets from connecting " 1845 "to PF_INET sockets"), 1846 NULL, 0, &ip6_v6only, 0, 1847 CTL_NET, PF_INET6, IPPROTO_IPV6, 1848 IPV6CTL_V6ONLY, CTL_EOL); 1849 sysctl_createv(clog, 0, NULL, NULL, 1850 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1851 CTLTYPE_INT, "anonportmin", 1852 SYSCTL_DESCR("Lowest ephemeral port number to assign"), 1853 sysctl_net_inet_ip_ports, 0, &ip6_anonportmin, 0, 1854 CTL_NET, PF_INET6, IPPROTO_IPV6, 1855 IPV6CTL_ANONPORTMIN, CTL_EOL); 1856 sysctl_createv(clog, 0, NULL, NULL, 1857 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1858 CTLTYPE_INT, "anonportmax", 1859 SYSCTL_DESCR("Highest ephemeral port number to assign"), 1860 sysctl_net_inet_ip_ports, 0, &ip6_anonportmax, 0, 1861 CTL_NET, PF_INET6, IPPROTO_IPV6, 1862 IPV6CTL_ANONPORTMAX, CTL_EOL); 1863 #ifndef IPNOPRIVPORTS 1864 sysctl_createv(clog, 0, NULL, NULL, 1865 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1866 CTLTYPE_INT, "lowportmin", 1867 SYSCTL_DESCR("Lowest privileged ephemeral port number " 1868 "to assign"), 1869 sysctl_net_inet_ip_ports, 0, &ip6_lowportmin, 0, 1870 CTL_NET, PF_INET6, IPPROTO_IPV6, 1871 IPV6CTL_LOWPORTMIN, CTL_EOL); 1872 sysctl_createv(clog, 0, NULL, NULL, 1873 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1874 CTLTYPE_INT, "lowportmax", 1875 SYSCTL_DESCR("Highest privileged ephemeral port number " 1876 "to assign"), 1877 sysctl_net_inet_ip_ports, 0, &ip6_lowportmax, 0, 1878 CTL_NET, PF_INET6, IPPROTO_IPV6, 1879 IPV6CTL_LOWPORTMAX, CTL_EOL); 1880 #endif /* IPNOPRIVPORTS */ 1881 sysctl_createv(clog, 0, NULL, NULL, 1882 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1883 CTLTYPE_INT, "use_tempaddr", 1884 SYSCTL_DESCR("Use temporary address"), 1885 NULL, 0, &ip6_use_tempaddr, 0, 1886 CTL_NET, PF_INET6, IPPROTO_IPV6, 1887 CTL_CREATE, CTL_EOL); 1888 sysctl_createv(clog, 0, NULL, NULL, 1889 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1890 CTLTYPE_INT, "temppltime", 1891 SYSCTL_DESCR("preferred lifetime of a temporary address"), 1892 NULL, 0, &ip6_temp_preferred_lifetime, 0, 1893 CTL_NET, PF_INET6, IPPROTO_IPV6, 1894 CTL_CREATE, CTL_EOL); 1895 sysctl_createv(clog, 0, NULL, NULL, 1896 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1897 CTLTYPE_INT, "tempvltime", 1898 SYSCTL_DESCR("valid lifetime of a temporary address"), 1899 NULL, 0, &ip6_temp_valid_lifetime, 0, 1900 CTL_NET, PF_INET6, IPPROTO_IPV6, 1901 CTL_CREATE, CTL_EOL); 1902 sysctl_createv(clog, 0, NULL, NULL, 1903 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1904 CTLTYPE_INT, "maxfrags", 1905 SYSCTL_DESCR("Maximum fragments in reassembly queue"), 1906 NULL, 0, &ip6_maxfrags, 0, 1907 CTL_NET, PF_INET6, IPPROTO_IPV6, 1908 IPV6CTL_MAXFRAGS, CTL_EOL); 1909 sysctl_createv(clog, 0, NULL, NULL, 1910 CTLFLAG_PERMANENT, 1911 CTLTYPE_STRUCT, "stats", 1912 SYSCTL_DESCR("IPv6 statistics"), 1913 sysctl_net_inet6_ip6_stats, 0, NULL, 0, 1914 CTL_NET, PF_INET6, IPPROTO_IPV6, 1915 IPV6CTL_STATS, CTL_EOL); 1916 sysctl_createv(clog, 0, NULL, NULL, 1917 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1918 CTLTYPE_INT, "use_defaultzone", 1919 SYSCTL_DESCR("Whether to use the default scope zones"), 1920 NULL, 0, &ip6_use_defzone, 0, 1921 CTL_NET, PF_INET6, IPPROTO_IPV6, 1922 IPV6CTL_USE_DEFAULTZONE, CTL_EOL); 1923 sysctl_createv(clog, 0, NULL, NULL, 1924 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1925 CTLTYPE_INT, "mcast_pmtu", 1926 SYSCTL_DESCR("Enable pMTU discovery for multicast packet"), 1927 NULL, 0, &ip6_mcast_pmtu, 0, 1928 CTL_NET, PF_INET6, IPPROTO_IPV6, 1929 CTL_CREATE, CTL_EOL); 1930 #ifdef GATEWAY 1931 sysctl_createv(clog, 0, NULL, NULL, 1932 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1933 CTLTYPE_INT, "maxflows", 1934 SYSCTL_DESCR("Number of flows for fast forwarding (IPv6)"), 1935 sysctl_net_inet6_ip6_maxflows, 0, &ip6_maxflows, 0, 1936 CTL_NET, PF_INET6, IPPROTO_IPV6, 1937 CTL_CREATE, CTL_EOL); 1938 sysctl_createv(clog, 0, NULL, NULL, 1939 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1940 CTLTYPE_INT, "hashsize", 1941 SYSCTL_DESCR("Size of hash table for fast forwarding (IPv6)"), 1942 sysctl_net_inet6_ip6_hashsize, 0, &ip6_hashsize, 0, 1943 CTL_NET, PF_INET6, IPPROTO_IPV6, 1944 CTL_CREATE, CTL_EOL); 1945 #endif 1946 /* anonportalgo RFC6056 subtree */ 1947 const struct sysctlnode *portalgo_node; 1948 sysctl_createv(clog, 0, NULL, &portalgo_node, 1949 CTLFLAG_PERMANENT, 1950 CTLTYPE_NODE, "anonportalgo", 1951 SYSCTL_DESCR("Anonymous port algorithm selection (RFC 6056)"), 1952 NULL, 0, NULL, 0, 1953 CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_CREATE, CTL_EOL); 1954 sysctl_createv(clog, 0, &portalgo_node, NULL, 1955 CTLFLAG_PERMANENT, 1956 CTLTYPE_STRING, "available", 1957 SYSCTL_DESCR("available algorithms"), 1958 sysctl_portalgo_available, 0, NULL, PORTALGO_MAXLEN, 1959 CTL_CREATE, CTL_EOL); 1960 sysctl_createv(clog, 0, &portalgo_node, NULL, 1961 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1962 CTLTYPE_STRING, "selected", 1963 SYSCTL_DESCR("selected algorithm"), 1964 sysctl_portalgo_selected6, 0, NULL, PORTALGO_MAXLEN, 1965 CTL_CREATE, CTL_EOL); 1966 sysctl_createv(clog, 0, &portalgo_node, NULL, 1967 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1968 CTLTYPE_STRUCT, "reserve", 1969 SYSCTL_DESCR("bitmap of reserved ports"), 1970 sysctl_portalgo_reserve6, 0, NULL, 0, 1971 CTL_CREATE, CTL_EOL); 1972 sysctl_createv(clog, 0, NULL, NULL, 1973 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1974 CTLTYPE_INT, "neighborgcthresh", 1975 SYSCTL_DESCR("Maximum number of entries in neighbor" 1976 " cache"), 1977 NULL, 1, &ip6_neighborgcthresh, 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, "maxifprefixes", 1983 SYSCTL_DESCR("Maximum number of prefixes created by" 1984 " route advertisement per interface"), 1985 NULL, 1, &ip6_maxifprefixes, 0, 1986 CTL_NET, PF_INET6, IPPROTO_IPV6, 1987 CTL_CREATE, CTL_EOL); 1988 sysctl_createv(clog, 0, NULL, NULL, 1989 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1990 CTLTYPE_INT, "maxifdefrouters", 1991 SYSCTL_DESCR("Maximum number of default routers created" 1992 " by route advertisement per interface"), 1993 NULL, 1, &ip6_maxifdefrouters, 0, 1994 CTL_NET, PF_INET6, IPPROTO_IPV6, 1995 CTL_CREATE, CTL_EOL); 1996 sysctl_createv(clog, 0, NULL, NULL, 1997 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1998 CTLTYPE_INT, "maxdynroutes", 1999 SYSCTL_DESCR("Maximum number of routes created via" 2000 " redirect"), 2001 NULL, 1, &ip6_maxdynroutes, 0, 2002 CTL_NET, PF_INET6, IPPROTO_IPV6, 2003 CTL_CREATE, CTL_EOL); 2004 } 2005 2006 void 2007 ip6_statinc(u_int stat) 2008 { 2009 2010 KASSERT(stat < IP6_NSTATS); 2011 IP6_STATINC(stat); 2012 } 2013