ip6_input.c revision 1.165
1 /* $NetBSD: ip6_input.c,v 1.165 2016/08/01 03:15:31 ozaki-r Exp $ */ 2 /* $KAME: ip6_input.c,v 1.188 2001/03/29 05:34:31 itojun Exp $ */ 3 4 /* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* 34 * Copyright (c) 1982, 1986, 1988, 1993 35 * The Regents of the University of California. All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. Neither the name of the University nor the names of its contributors 46 * may be used to endorse or promote products derived from this software 47 * without specific prior written permission. 48 * 49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 59 * SUCH DAMAGE. 60 * 61 * @(#)ip_input.c 8.2 (Berkeley) 1/4/94 62 */ 63 64 #include <sys/cdefs.h> 65 __KERNEL_RCSID(0, "$NetBSD: ip6_input.c,v 1.165 2016/08/01 03:15:31 ozaki-r Exp $"); 66 67 #ifdef _KERNEL_OPT 68 #include "opt_gateway.h" 69 #include "opt_inet.h" 70 #include "opt_inet6.h" 71 #include "opt_ipsec.h" 72 #include "opt_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 pktqueue_t *ip6_pktq __read_mostly; 137 138 int ip6_forward_srcrt; /* XXX */ 139 int ip6_sourcecheck; /* XXX */ 140 int ip6_sourcecheck_interval; /* XXX */ 141 142 pfil_head_t *inet6_pfil_hook; 143 144 percpu_t *ip6stat_percpu; 145 146 static void ip6_init2(void); 147 static void ip6intr(void *); 148 static struct m_tag *ip6_setdstifaddr(struct mbuf *, const struct in6_ifaddr *); 149 150 static int ip6_process_hopopts(struct mbuf *, u_int8_t *, int, u_int32_t *, 151 u_int32_t *); 152 static struct mbuf *ip6_pullexthdr(struct mbuf *, size_t, int); 153 static void sysctl_net_inet6_ip6_setup(struct sysctllog **); 154 155 /* 156 * IP6 initialization: fill in IP6 protocol switch table. 157 * All protocols not implemented in kernel go to raw IP6 protocol handler. 158 */ 159 void 160 ip6_init(void) 161 { 162 const struct ip6protosw *pr; 163 int i; 164 165 in6_init(); 166 167 sysctl_net_inet6_ip6_setup(NULL); 168 pr = (const struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 169 if (pr == 0) 170 panic("ip6_init"); 171 for (i = 0; i < IPPROTO_MAX; i++) 172 ip6_protox[i] = pr - inet6sw; 173 for (pr = (const struct ip6protosw *)inet6domain.dom_protosw; 174 pr < (const struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++) 175 if (pr->pr_domain->dom_family == PF_INET6 && 176 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) 177 ip6_protox[pr->pr_protocol] = pr - inet6sw; 178 179 ip6_pktq = pktq_create(IFQ_MAXLEN, ip6intr, NULL); 180 KASSERT(ip6_pktq != NULL); 181 182 scope6_init(); 183 addrsel_policy_init(); 184 nd6_init(); 185 frag6_init(); 186 ip6_desync_factor = cprng_fast32() % MAX_TEMP_DESYNC_FACTOR; 187 188 ip6_init2(); 189 #ifdef GATEWAY 190 ip6flow_init(ip6_hashsize); 191 #endif 192 /* Register our Packet Filter hook. */ 193 inet6_pfil_hook = pfil_head_create(PFIL_TYPE_AF, (void *)AF_INET6); 194 KASSERT(inet6_pfil_hook != NULL); 195 196 ip6stat_percpu = percpu_alloc(sizeof(uint64_t) * IP6_NSTATS); 197 } 198 199 static void 200 ip6_init2(void) 201 { 202 203 /* timer for regeneranation of temporary addresses randomize ID */ 204 callout_init(&in6_tmpaddrtimer_ch, CALLOUT_MPSAFE); 205 callout_reset(&in6_tmpaddrtimer_ch, 206 (ip6_temp_preferred_lifetime - ip6_desync_factor - 207 ip6_temp_regen_advance) * hz, 208 in6_tmpaddrtimer, NULL); 209 } 210 211 /* 212 * IP6 input interrupt handling. Just pass the packet to ip6_input. 213 */ 214 static void 215 ip6intr(void *arg __unused) 216 { 217 struct mbuf *m; 218 219 mutex_enter(softnet_lock); 220 while ((m = pktq_dequeue(ip6_pktq)) != NULL) { 221 struct psref psref; 222 struct ifnet *rcvif = m_get_rcvif_psref(m, &psref); 223 224 if (rcvif == NULL) { 225 m_freem(m); 226 continue; 227 } 228 /* 229 * Drop the packet if IPv6 is disabled on the interface. 230 */ 231 if ((ND_IFINFO(rcvif)->flags & ND6_IFF_IFDISABLED)) { 232 m_put_rcvif_psref(rcvif, &psref); 233 m_freem(m); 234 continue; 235 } 236 ip6_input(m, rcvif); 237 m_put_rcvif_psref(rcvif, &psref); 238 } 239 mutex_exit(softnet_lock); 240 } 241 242 extern struct route ip6_forward_rt; 243 244 void 245 ip6_input(struct mbuf *m, struct ifnet *rcvif) 246 { 247 struct ip6_hdr *ip6; 248 int hit, off = sizeof(struct ip6_hdr), nest; 249 u_int32_t plen; 250 u_int32_t rtalert = ~0; 251 int nxt, ours = 0, rh_present = 0; 252 struct ifnet *deliverifp = NULL; 253 int srcrt = 0; 254 const struct rtentry *rt; 255 union { 256 struct sockaddr dst; 257 struct sockaddr_in6 dst6; 258 } u; 259 260 /* 261 * make sure we don't have onion peering information into m_tag. 262 */ 263 ip6_delaux(m); 264 265 /* 266 * mbuf statistics 267 */ 268 if (m->m_flags & M_EXT) { 269 if (m->m_next) 270 IP6_STATINC(IP6_STAT_MEXT2M); 271 else 272 IP6_STATINC(IP6_STAT_MEXT1); 273 } else { 274 #define M2MMAX 32 275 if (m->m_next) { 276 if (m->m_flags & M_LOOP) 277 /*XXX*/ IP6_STATINC(IP6_STAT_M2M + lo0ifp->if_index); 278 else if (rcvif->if_index < M2MMAX) 279 IP6_STATINC(IP6_STAT_M2M + rcvif->if_index); 280 else 281 IP6_STATINC(IP6_STAT_M2M); 282 } else 283 IP6_STATINC(IP6_STAT_M1); 284 #undef M2MMAX 285 } 286 287 in6_ifstat_inc(rcvif, ifs6_in_receive); 288 IP6_STATINC(IP6_STAT_TOTAL); 289 290 /* 291 * If the IPv6 header is not aligned, slurp it up into a new 292 * mbuf with space for link headers, in the event we forward 293 * it. Otherwise, if it is aligned, make sure the entire base 294 * IPv6 header is in the first mbuf of the chain. 295 */ 296 if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 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(rcvif, ifs6_in_hdrerr); 302 return; 303 } 304 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 305 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 306 IP6_STATINC(IP6_STAT_TOOSMALL); 307 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 308 return; 309 } 310 } 311 312 ip6 = mtod(m, struct ip6_hdr *); 313 314 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 315 IP6_STATINC(IP6_STAT_BADVERS); 316 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 317 goto bad; 318 } 319 320 /* 321 * Assume that we can create a fast-forward IP flow entry 322 * based on this packet. 323 */ 324 m->m_flags |= M_CANFASTFWD; 325 326 /* 327 * Run through list of hooks for input packets. If there are any 328 * filters which require that additional packets in the flow are 329 * not fast-forwarded, they must clear the M_CANFASTFWD flag. 330 * Note that filters must _never_ set this flag, as another filter 331 * in the list may have previously cleared it. 332 */ 333 /* 334 * let ipfilter look at packet on the wire, 335 * not the decapsulated packet. 336 */ 337 #if defined(IPSEC) 338 if (!ipsec_used || !ipsec_indone(m)) 339 #else 340 if (1) 341 #endif 342 { 343 struct in6_addr odst; 344 345 odst = ip6->ip6_dst; 346 if (pfil_run_hooks(inet6_pfil_hook, &m, rcvif, PFIL_IN) != 0) 347 return; 348 if (m == NULL) 349 return; 350 ip6 = mtod(m, struct ip6_hdr *); 351 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst); 352 } 353 354 IP6_STATINC(IP6_STAT_NXTHIST + ip6->ip6_nxt); 355 356 #ifdef ALTQ 357 if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) { 358 /* packet is dropped by traffic conditioner */ 359 return; 360 } 361 #endif 362 363 /* 364 * Check against address spoofing/corruption. 365 */ 366 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) || 367 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) { 368 /* 369 * XXX: "badscope" is not very suitable for a multicast source. 370 */ 371 IP6_STATINC(IP6_STAT_BADSCOPE); 372 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 373 goto bad; 374 } 375 /* 376 * The following check is not documented in specs. A malicious 377 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack 378 * and bypass security checks (act as if it was from 127.0.0.1 by using 379 * IPv6 src ::ffff:127.0.0.1). Be cautious. 380 * 381 * This check chokes if we are in an SIIT cloud. As none of BSDs 382 * support IPv4-less kernel compilation, we cannot support SIIT 383 * environment at all. So, it makes more sense for us to reject any 384 * malicious packets for non-SIIT environment, than try to do a 385 * partial support for SIIT environment. 386 */ 387 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 388 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 389 IP6_STATINC(IP6_STAT_BADSCOPE); 390 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 391 goto bad; 392 } 393 #if 0 394 /* 395 * Reject packets with IPv4 compatible addresses (auto tunnel). 396 * 397 * The code forbids auto tunnel relay case in RFC1933 (the check is 398 * stronger than RFC1933). We may want to re-enable it if mech-xx 399 * is revised to forbid relaying case. 400 */ 401 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) || 402 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) { 403 IP6_STATINC(IP6_STAT_BADSCOPE); 404 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 405 goto bad; 406 } 407 #endif 408 409 /* 410 * Disambiguate address scope zones (if there is ambiguity). 411 * We first make sure that the original source or destination address 412 * is not in our internal form for scoped addresses. Such addresses 413 * are not necessarily invalid spec-wise, but we cannot accept them due 414 * to the usage conflict. 415 * in6_setscope() then also checks and rejects the cases where src or 416 * dst are the loopback address and the receiving interface 417 * is not loopback. 418 */ 419 if (__predict_false( 420 m_makewritable(&m, 0, sizeof(struct ip6_hdr), M_DONTWAIT))) 421 goto bad; 422 ip6 = mtod(m, struct ip6_hdr *); 423 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) { 424 IP6_STATINC(IP6_STAT_BADSCOPE); /* XXX */ 425 goto bad; 426 } 427 if (in6_setscope(&ip6->ip6_src, rcvif, NULL) || 428 in6_setscope(&ip6->ip6_dst, rcvif, NULL)) { 429 IP6_STATINC(IP6_STAT_BADSCOPE); 430 goto bad; 431 } 432 433 /* 434 * Multicast check 435 */ 436 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 437 struct in6_multi *in6m = 0; 438 439 in6_ifstat_inc(rcvif, ifs6_in_mcast); 440 /* 441 * See if we belong to the destination multicast group on the 442 * arrival interface. 443 */ 444 IN6_LOOKUP_MULTI(ip6->ip6_dst, rcvif, in6m); 445 if (in6m) 446 ours = 1; 447 else if (!ip6_mrouter) { 448 uint64_t *ip6s = IP6_STAT_GETREF(); 449 ip6s[IP6_STAT_NOTMEMBER]++; 450 ip6s[IP6_STAT_CANTFORWARD]++; 451 IP6_STAT_PUTREF(); 452 in6_ifstat_inc(rcvif, ifs6_in_discard); 453 goto bad; 454 } 455 deliverifp = rcvif; 456 goto hbhcheck; 457 } 458 459 sockaddr_in6_init(&u.dst6, &ip6->ip6_dst, 0, 0, 0); 460 461 /* 462 * Unicast check 463 */ 464 rt = rtcache_lookup2(&ip6_forward_rt, &u.dst, 1, &hit); 465 if (hit) 466 IP6_STATINC(IP6_STAT_FORWARD_CACHEHIT); 467 else 468 IP6_STATINC(IP6_STAT_FORWARD_CACHEMISS); 469 470 #define rt6_getkey(__rt) satocsin6(rt_getkey(__rt)) 471 472 /* 473 * Accept the packet if the forwarding interface to the destination 474 * according to the routing table is the loopback interface, 475 * unless the associated route has a gateway. 476 * Note that this approach causes to accept a packet if there is a 477 * route to the loopback interface for the destination of the packet. 478 * But we think it's even useful in some situations, e.g. when using 479 * a special daemon which wants to intercept the packet. 480 */ 481 if (rt != NULL && 482 (rt->rt_flags & (RTF_HOST|RTF_GATEWAY)) == RTF_HOST && 483 #if 0 484 /* 485 * The check below is redundant since the comparison of 486 * the destination and the key of the rtentry has 487 * already done through looking up the routing table. 488 */ 489 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &rt6_getkey(rt)->sin6_addr) && 490 #endif 491 rt->rt_ifp->if_type == IFT_LOOP) { 492 struct in6_ifaddr *ia6 = (struct in6_ifaddr *)rt->rt_ifa; 493 if (ia6->ia6_flags & IN6_IFF_ANYCAST) 494 m->m_flags |= M_ANYCAST6; 495 /* 496 * packets to a tentative, duplicated, or somehow invalid 497 * address must not be accepted. 498 */ 499 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) { 500 /* this address is ready */ 501 ours = 1; 502 deliverifp = ia6->ia_ifp; /* correct? */ 503 goto hbhcheck; 504 } else { 505 /* address is not ready, so discard the packet. */ 506 nd6log(LOG_INFO, "packet to an unready address %s->%s\n", 507 ip6_sprintf(&ip6->ip6_src), 508 ip6_sprintf(&ip6->ip6_dst)); 509 510 goto bad; 511 } 512 } 513 514 /* 515 * FAITH (Firewall Aided Internet Translator) 516 */ 517 #if defined(NFAITH) && 0 < NFAITH 518 if (ip6_keepfaith) { 519 if (rt != NULL && rt->rt_ifp != NULL && 520 rt->rt_ifp->if_type == IFT_FAITH) { 521 /* XXX do we need more sanity checks? */ 522 ours = 1; 523 deliverifp = rt->rt_ifp; /* faith */ 524 goto hbhcheck; 525 } 526 } 527 #endif 528 529 #if 0 530 { 531 /* 532 * Last resort: check in6_ifaddr for incoming interface. 533 * The code is here until I update the "goto ours hack" code above 534 * working right. 535 */ 536 struct ifaddr *ifa; 537 IFADDR_READER_FOREACH(ifa, rcvif) { 538 if (ifa->ifa_addr->sa_family != AF_INET6) 539 continue; 540 if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) { 541 ours = 1; 542 deliverifp = ifa->ifa_ifp; 543 goto hbhcheck; 544 } 545 } 546 } 547 #endif 548 549 /* 550 * Now there is no reason to process the packet if it's not our own 551 * and we're not a router. 552 */ 553 if (!ip6_forwarding) { 554 IP6_STATINC(IP6_STAT_CANTFORWARD); 555 in6_ifstat_inc(rcvif, ifs6_in_discard); 556 goto bad; 557 } 558 559 hbhcheck: 560 /* 561 * record address information into m_tag, if we don't have one yet. 562 * note that we are unable to record it, if the address is not listed 563 * as our interface address (e.g. multicast addresses, addresses 564 * within FAITH prefixes and such). 565 */ 566 if (deliverifp && ip6_getdstifaddr(m) == NULL) { 567 struct in6_ifaddr *ia6; 568 int s = pserialize_read_enter(); 569 570 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 571 /* Depends on ip6_setdstifaddr never sleep */ 572 if (ia6 != NULL && ip6_setdstifaddr(m, ia6) == NULL) { 573 /* 574 * XXX maybe we should drop the packet here, 575 * as we could not provide enough information 576 * to the upper layers. 577 */ 578 } 579 pserialize_read_exit(s); 580 } 581 582 /* 583 * Process Hop-by-Hop options header if it's contained. 584 * m may be modified in ip6_hopopts_input(). 585 * If a JumboPayload option is included, plen will also be modified. 586 */ 587 plen = (u_int32_t)ntohs(ip6->ip6_plen); 588 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 589 struct ip6_hbh *hbh; 590 591 if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) { 592 #if 0 /*touches NULL pointer*/ 593 in6_ifstat_inc(rcvif, ifs6_in_discard); 594 #endif 595 return; /* m have already been freed */ 596 } 597 598 /* adjust pointer */ 599 ip6 = mtod(m, struct ip6_hdr *); 600 601 /* 602 * if the payload length field is 0 and the next header field 603 * indicates Hop-by-Hop Options header, then a Jumbo Payload 604 * option MUST be included. 605 */ 606 if (ip6->ip6_plen == 0 && plen == 0) { 607 /* 608 * Note that if a valid jumbo payload option is 609 * contained, ip6_hopopts_input() must set a valid 610 * (non-zero) payload length to the variable plen. 611 */ 612 IP6_STATINC(IP6_STAT_BADOPTIONS); 613 in6_ifstat_inc(rcvif, ifs6_in_discard); 614 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 615 icmp6_error(m, ICMP6_PARAM_PROB, 616 ICMP6_PARAMPROB_HEADER, 617 (char *)&ip6->ip6_plen - (char *)ip6); 618 return; 619 } 620 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 621 sizeof(struct ip6_hbh)); 622 if (hbh == NULL) { 623 IP6_STATINC(IP6_STAT_TOOSHORT); 624 return; 625 } 626 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 627 nxt = hbh->ip6h_nxt; 628 629 /* 630 * accept the packet if a router alert option is included 631 * and we act as an IPv6 router. 632 */ 633 if (rtalert != ~0 && ip6_forwarding) 634 ours = 1; 635 } else 636 nxt = ip6->ip6_nxt; 637 638 /* 639 * Check that the amount of data in the buffers 640 * is as at least much as the IPv6 header would have us expect. 641 * Trim mbufs if longer than we expect. 642 * Drop packet if shorter than we expect. 643 */ 644 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 645 IP6_STATINC(IP6_STAT_TOOSHORT); 646 in6_ifstat_inc(rcvif, ifs6_in_truncated); 647 goto bad; 648 } 649 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 650 if (m->m_len == m->m_pkthdr.len) { 651 m->m_len = sizeof(struct ip6_hdr) + plen; 652 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 653 } else 654 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 655 } 656 657 /* 658 * Forward if desirable. 659 */ 660 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 661 /* 662 * If we are acting as a multicast router, all 663 * incoming multicast packets are passed to the 664 * kernel-level multicast forwarding function. 665 * The packet is returned (relatively) intact; if 666 * ip6_mforward() returns a non-zero value, the packet 667 * must be discarded, else it may be accepted below. 668 */ 669 if (ip6_mrouter && ip6_mforward(ip6, rcvif, m)) { 670 IP6_STATINC(IP6_STAT_CANTFORWARD); 671 m_freem(m); 672 return; 673 } 674 if (!ours) { 675 m_freem(m); 676 return; 677 } 678 } else if (!ours) { 679 ip6_forward(m, srcrt); 680 return; 681 } 682 683 ip6 = mtod(m, struct ip6_hdr *); 684 685 /* 686 * Malicious party may be able to use IPv4 mapped addr to confuse 687 * tcp/udp stack and bypass security checks (act as if it was from 688 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious. 689 * 690 * For SIIT end node behavior, you may want to disable the check. 691 * However, you will become vulnerable to attacks using IPv4 mapped 692 * source. 693 */ 694 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 695 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 696 IP6_STATINC(IP6_STAT_BADSCOPE); 697 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 698 goto bad; 699 } 700 701 /* 702 * Tell launch routine the next header 703 */ 704 #ifdef IFA_STATS 705 if (deliverifp != NULL) { 706 struct in6_ifaddr *ia6; 707 int s = pserialize_read_enter(); 708 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 709 if (ia6) 710 ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len; 711 pserialize_read_exit(s); 712 } 713 #endif 714 IP6_STATINC(IP6_STAT_DELIVERED); 715 in6_ifstat_inc(deliverifp, ifs6_in_deliver); 716 nest = 0; 717 718 rh_present = 0; 719 while (nxt != IPPROTO_DONE) { 720 if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) { 721 IP6_STATINC(IP6_STAT_TOOMANYHDR); 722 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 723 goto bad; 724 } 725 726 /* 727 * protection against faulty packet - there should be 728 * more sanity checks in header chain processing. 729 */ 730 if (m->m_pkthdr.len < off) { 731 IP6_STATINC(IP6_STAT_TOOSHORT); 732 in6_ifstat_inc(rcvif, ifs6_in_truncated); 733 goto bad; 734 } 735 736 if (nxt == IPPROTO_ROUTING) { 737 if (rh_present++) { 738 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 739 IP6_STATINC(IP6_STAT_BADOPTIONS); 740 goto bad; 741 } 742 } 743 744 #ifdef IPSEC 745 if (ipsec_used) { 746 /* 747 * enforce IPsec policy checking if we are seeing last 748 * header. note that we do not visit this with 749 * protocols with pcb layer code - like udp/tcp/raw ip. 750 */ 751 if ((inet6sw[ip_protox[nxt]].pr_flags 752 & PR_LASTHDR) != 0) { 753 int error = ipsec6_input(m); 754 if (error) 755 goto bad; 756 } 757 } 758 #endif /* IPSEC */ 759 760 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt); 761 } 762 return; 763 bad: 764 m_freem(m); 765 } 766 767 /* 768 * set/grab in6_ifaddr correspond to IPv6 destination address. 769 */ 770 static struct m_tag * 771 ip6_setdstifaddr(struct mbuf *m, const struct in6_ifaddr *ia) 772 { 773 struct m_tag *mtag; 774 struct ip6aux *ip6a; 775 776 mtag = ip6_addaux(m); 777 if (mtag == NULL) 778 return NULL; 779 780 ip6a = (struct ip6aux *)(mtag + 1); 781 if (in6_setscope(&ip6a->ip6a_src, ia->ia_ifp, &ip6a->ip6a_scope_id)) { 782 IP6_STATINC(IP6_STAT_BADSCOPE); 783 return NULL; 784 } 785 786 ip6a->ip6a_src = ia->ia_addr.sin6_addr; 787 ip6a->ip6a_flags = ia->ia6_flags; 788 return mtag; 789 } 790 791 const struct ip6aux * 792 ip6_getdstifaddr(struct mbuf *m) 793 { 794 struct m_tag *mtag; 795 796 mtag = ip6_findaux(m); 797 if (mtag != NULL) 798 return (struct ip6aux *)(mtag + 1); 799 else 800 return NULL; 801 } 802 803 /* 804 * Hop-by-Hop options header processing. If a valid jumbo payload option is 805 * included, the real payload length will be stored in plenp. 806 * 807 * rtalertp - XXX: should be stored more smart way 808 */ 809 int 810 ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp, 811 struct mbuf **mp, int *offp) 812 { 813 struct mbuf *m = *mp; 814 int off = *offp, hbhlen; 815 struct ip6_hbh *hbh; 816 817 /* validation of the length of the header */ 818 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, 819 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh)); 820 if (hbh == NULL) { 821 IP6_STATINC(IP6_STAT_TOOSHORT); 822 return -1; 823 } 824 hbhlen = (hbh->ip6h_len + 1) << 3; 825 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 826 hbhlen); 827 if (hbh == NULL) { 828 IP6_STATINC(IP6_STAT_TOOSHORT); 829 return -1; 830 } 831 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 832 off += hbhlen; 833 hbhlen -= sizeof(struct ip6_hbh); 834 835 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 836 hbhlen, rtalertp, plenp) < 0) 837 return (-1); 838 839 *offp = off; 840 *mp = m; 841 return (0); 842 } 843 844 /* 845 * Search header for all Hop-by-hop options and process each option. 846 * This function is separate from ip6_hopopts_input() in order to 847 * handle a case where the sending node itself process its hop-by-hop 848 * options header. In such a case, the function is called from ip6_output(). 849 * 850 * The function assumes that hbh header is located right after the IPv6 header 851 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to 852 * opthead + hbhlen is located in continuous memory region. 853 */ 854 static int 855 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen, 856 u_int32_t *rtalertp, u_int32_t *plenp) 857 { 858 struct ip6_hdr *ip6; 859 int optlen = 0; 860 u_int8_t *opt = opthead; 861 u_int16_t rtalert_val; 862 u_int32_t jumboplen; 863 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh); 864 865 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 866 switch (*opt) { 867 case IP6OPT_PAD1: 868 optlen = 1; 869 break; 870 case IP6OPT_PADN: 871 if (hbhlen < IP6OPT_MINLEN) { 872 IP6_STATINC(IP6_STAT_TOOSMALL); 873 goto bad; 874 } 875 optlen = *(opt + 1) + 2; 876 break; 877 case IP6OPT_RTALERT: 878 /* XXX may need check for alignment */ 879 if (hbhlen < IP6OPT_RTALERT_LEN) { 880 IP6_STATINC(IP6_STAT_TOOSMALL); 881 goto bad; 882 } 883 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) { 884 /* XXX stat */ 885 icmp6_error(m, ICMP6_PARAM_PROB, 886 ICMP6_PARAMPROB_HEADER, 887 erroff + opt + 1 - opthead); 888 return (-1); 889 } 890 optlen = IP6OPT_RTALERT_LEN; 891 memcpy((void *)&rtalert_val, (void *)(opt + 2), 2); 892 *rtalertp = ntohs(rtalert_val); 893 break; 894 case IP6OPT_JUMBO: 895 /* XXX may need check for alignment */ 896 if (hbhlen < IP6OPT_JUMBO_LEN) { 897 IP6_STATINC(IP6_STAT_TOOSMALL); 898 goto bad; 899 } 900 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) { 901 /* XXX stat */ 902 icmp6_error(m, ICMP6_PARAM_PROB, 903 ICMP6_PARAMPROB_HEADER, 904 erroff + opt + 1 - opthead); 905 return (-1); 906 } 907 optlen = IP6OPT_JUMBO_LEN; 908 909 /* 910 * IPv6 packets that have non 0 payload length 911 * must not contain a jumbo payload option. 912 */ 913 ip6 = mtod(m, struct ip6_hdr *); 914 if (ip6->ip6_plen) { 915 IP6_STATINC(IP6_STAT_BADOPTIONS); 916 icmp6_error(m, ICMP6_PARAM_PROB, 917 ICMP6_PARAMPROB_HEADER, 918 erroff + opt - opthead); 919 return (-1); 920 } 921 922 /* 923 * We may see jumbolen in unaligned location, so 924 * we'd need to perform bcopy(). 925 */ 926 memcpy(&jumboplen, opt + 2, sizeof(jumboplen)); 927 jumboplen = (u_int32_t)htonl(jumboplen); 928 929 #if 1 930 /* 931 * if there are multiple jumbo payload options, 932 * *plenp will be non-zero and the packet will be 933 * rejected. 934 * the behavior may need some debate in ipngwg - 935 * multiple options does not make sense, however, 936 * there's no explicit mention in specification. 937 */ 938 if (*plenp != 0) { 939 IP6_STATINC(IP6_STAT_BADOPTIONS); 940 icmp6_error(m, ICMP6_PARAM_PROB, 941 ICMP6_PARAMPROB_HEADER, 942 erroff + opt + 2 - opthead); 943 return (-1); 944 } 945 #endif 946 947 /* 948 * jumbo payload length must be larger than 65535. 949 */ 950 if (jumboplen <= IPV6_MAXPACKET) { 951 IP6_STATINC(IP6_STAT_BADOPTIONS); 952 icmp6_error(m, ICMP6_PARAM_PROB, 953 ICMP6_PARAMPROB_HEADER, 954 erroff + opt + 2 - opthead); 955 return (-1); 956 } 957 *plenp = jumboplen; 958 959 break; 960 default: /* unknown option */ 961 if (hbhlen < IP6OPT_MINLEN) { 962 IP6_STATINC(IP6_STAT_TOOSMALL); 963 goto bad; 964 } 965 optlen = ip6_unknown_opt(opt, m, 966 erroff + opt - opthead); 967 if (optlen == -1) 968 return (-1); 969 optlen += 2; 970 break; 971 } 972 } 973 974 return (0); 975 976 bad: 977 m_freem(m); 978 return (-1); 979 } 980 981 /* 982 * Unknown option processing. 983 * The third argument `off' is the offset from the IPv6 header to the option, 984 * which is necessary if the IPv6 header the and option header and IPv6 header 985 * is not continuous in order to return an ICMPv6 error. 986 */ 987 int 988 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off) 989 { 990 struct ip6_hdr *ip6; 991 992 switch (IP6OPT_TYPE(*optp)) { 993 case IP6OPT_TYPE_SKIP: /* ignore the option */ 994 return ((int)*(optp + 1)); 995 case IP6OPT_TYPE_DISCARD: /* silently discard */ 996 m_freem(m); 997 return (-1); 998 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 999 IP6_STATINC(IP6_STAT_BADOPTIONS); 1000 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 1001 return (-1); 1002 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 1003 IP6_STATINC(IP6_STAT_BADOPTIONS); 1004 ip6 = mtod(m, struct ip6_hdr *); 1005 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 1006 (m->m_flags & (M_BCAST|M_MCAST))) 1007 m_freem(m); 1008 else 1009 icmp6_error(m, ICMP6_PARAM_PROB, 1010 ICMP6_PARAMPROB_OPTION, off); 1011 return (-1); 1012 } 1013 1014 m_freem(m); /* XXX: NOTREACHED */ 1015 return (-1); 1016 } 1017 1018 /* 1019 * Create the "control" list for this pcb. 1020 * 1021 * The routine will be called from upper layer handlers like tcp6_input(). 1022 * Thus the routine assumes that the caller (tcp6_input) have already 1023 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the 1024 * very first mbuf on the mbuf chain. 1025 * We may want to add some infinite loop prevention or sanity checks for safety. 1026 * (This applies only when you are using KAME mbuf chain restriction, i.e. 1027 * you are using IP6_EXTHDR_CHECK() not m_pulldown()) 1028 */ 1029 void 1030 ip6_savecontrol(struct in6pcb *in6p, struct mbuf **mp, 1031 struct ip6_hdr *ip6, struct mbuf *m) 1032 { 1033 #ifdef RFC2292 1034 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y)) 1035 #else 1036 #define IS2292(x, y) (y) 1037 #endif 1038 1039 if (in6p->in6p_socket->so_options & SO_TIMESTAMP 1040 #ifdef SO_OTIMESTAMP 1041 || in6p->in6p_socket->so_options & SO_OTIMESTAMP 1042 #endif 1043 ) { 1044 struct timeval tv; 1045 1046 microtime(&tv); 1047 #ifdef SO_OTIMESTAMP 1048 if (in6p->in6p_socket->so_options & SO_OTIMESTAMP) { 1049 struct timeval50 tv50; 1050 timeval_to_timeval50(&tv, &tv50); 1051 *mp = sbcreatecontrol((void *) &tv50, sizeof(tv50), 1052 SCM_OTIMESTAMP, SOL_SOCKET); 1053 } else 1054 #endif 1055 *mp = sbcreatecontrol((void *) &tv, sizeof(tv), 1056 SCM_TIMESTAMP, SOL_SOCKET); 1057 if (*mp) 1058 mp = &(*mp)->m_next; 1059 } 1060 1061 /* some OSes call this logic with IPv4 packet, for SO_TIMESTAMP */ 1062 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) 1063 return; 1064 1065 /* RFC 2292 sec. 5 */ 1066 if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) { 1067 struct in6_pktinfo pi6; 1068 1069 memcpy(&pi6.ipi6_addr, &ip6->ip6_dst, sizeof(struct in6_addr)); 1070 in6_clearscope(&pi6.ipi6_addr); /* XXX */ 1071 pi6.ipi6_ifindex = m->m_pkthdr.rcvif_index; 1072 *mp = sbcreatecontrol((void *) &pi6, 1073 sizeof(struct in6_pktinfo), 1074 IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6); 1075 if (*mp) 1076 mp = &(*mp)->m_next; 1077 } 1078 1079 if (in6p->in6p_flags & IN6P_HOPLIMIT) { 1080 int hlim = ip6->ip6_hlim & 0xff; 1081 1082 *mp = sbcreatecontrol((void *) &hlim, sizeof(int), 1083 IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6); 1084 if (*mp) 1085 mp = &(*mp)->m_next; 1086 } 1087 1088 if ((in6p->in6p_flags & IN6P_TCLASS) != 0) { 1089 u_int32_t flowinfo; 1090 int tclass; 1091 1092 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK); 1093 flowinfo >>= 20; 1094 1095 tclass = flowinfo & 0xff; 1096 *mp = sbcreatecontrol((void *)&tclass, sizeof(tclass), 1097 IPV6_TCLASS, IPPROTO_IPV6); 1098 1099 if (*mp) 1100 mp = &(*mp)->m_next; 1101 } 1102 1103 /* 1104 * IPV6_HOPOPTS socket option. Recall that we required super-user 1105 * privilege for the option (see ip6_ctloutput), but it might be too 1106 * strict, since there might be some hop-by-hop options which can be 1107 * returned to normal user. 1108 * See also RFC3542 section 8 (or RFC2292 section 6). 1109 */ 1110 if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0) { 1111 /* 1112 * Check if a hop-by-hop options header is contatined in the 1113 * received packet, and if so, store the options as ancillary 1114 * data. Note that a hop-by-hop options header must be 1115 * just after the IPv6 header, which fact is assured through 1116 * the IPv6 input processing. 1117 */ 1118 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1119 if (xip6->ip6_nxt == IPPROTO_HOPOPTS) { 1120 struct ip6_hbh *hbh; 1121 int hbhlen; 1122 struct mbuf *ext; 1123 1124 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr), 1125 xip6->ip6_nxt); 1126 if (ext == NULL) { 1127 IP6_STATINC(IP6_STAT_TOOSHORT); 1128 return; 1129 } 1130 hbh = mtod(ext, struct ip6_hbh *); 1131 hbhlen = (hbh->ip6h_len + 1) << 3; 1132 if (hbhlen != ext->m_len) { 1133 m_freem(ext); 1134 IP6_STATINC(IP6_STAT_TOOSHORT); 1135 return; 1136 } 1137 1138 /* 1139 * XXX: We copy whole the header even if a jumbo 1140 * payload option is included, which option is to 1141 * be removed before returning in the RFC 2292. 1142 * Note: this constraint is removed in RFC3542. 1143 */ 1144 *mp = sbcreatecontrol((void *)hbh, hbhlen, 1145 IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS), 1146 IPPROTO_IPV6); 1147 if (*mp) 1148 mp = &(*mp)->m_next; 1149 m_freem(ext); 1150 } 1151 } 1152 1153 /* IPV6_DSTOPTS and IPV6_RTHDR socket options */ 1154 if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) { 1155 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1156 int nxt = xip6->ip6_nxt, off = sizeof(struct ip6_hdr); 1157 1158 /* 1159 * Search for destination options headers or routing 1160 * header(s) through the header chain, and stores each 1161 * header as ancillary data. 1162 * Note that the order of the headers remains in 1163 * the chain of ancillary data. 1164 */ 1165 for (;;) { /* is explicit loop prevention necessary? */ 1166 struct ip6_ext *ip6e = NULL; 1167 int elen; 1168 struct mbuf *ext = NULL; 1169 1170 /* 1171 * if it is not an extension header, don't try to 1172 * pull it from the chain. 1173 */ 1174 switch (nxt) { 1175 case IPPROTO_DSTOPTS: 1176 case IPPROTO_ROUTING: 1177 case IPPROTO_HOPOPTS: 1178 case IPPROTO_AH: /* is it possible? */ 1179 break; 1180 default: 1181 goto loopend; 1182 } 1183 1184 ext = ip6_pullexthdr(m, off, nxt); 1185 if (ext == NULL) { 1186 IP6_STATINC(IP6_STAT_TOOSHORT); 1187 return; 1188 } 1189 ip6e = mtod(ext, struct ip6_ext *); 1190 if (nxt == IPPROTO_AH) 1191 elen = (ip6e->ip6e_len + 2) << 2; 1192 else 1193 elen = (ip6e->ip6e_len + 1) << 3; 1194 if (elen != ext->m_len) { 1195 m_freem(ext); 1196 IP6_STATINC(IP6_STAT_TOOSHORT); 1197 return; 1198 } 1199 KASSERT(IP6_HDR_ALIGNED_P(ip6e)); 1200 1201 switch (nxt) { 1202 case IPPROTO_DSTOPTS: 1203 if (!(in6p->in6p_flags & IN6P_DSTOPTS)) 1204 break; 1205 1206 *mp = sbcreatecontrol((void *)ip6e, elen, 1207 IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS), 1208 IPPROTO_IPV6); 1209 if (*mp) 1210 mp = &(*mp)->m_next; 1211 break; 1212 1213 case IPPROTO_ROUTING: 1214 if (!(in6p->in6p_flags & IN6P_RTHDR)) 1215 break; 1216 1217 *mp = sbcreatecontrol((void *)ip6e, elen, 1218 IS2292(IPV6_2292RTHDR, IPV6_RTHDR), 1219 IPPROTO_IPV6); 1220 if (*mp) 1221 mp = &(*mp)->m_next; 1222 break; 1223 1224 case IPPROTO_HOPOPTS: 1225 case IPPROTO_AH: /* is it possible? */ 1226 break; 1227 1228 default: 1229 /* 1230 * other cases have been filtered in the above. 1231 * none will visit this case. here we supply 1232 * the code just in case (nxt overwritten or 1233 * other cases). 1234 */ 1235 m_freem(ext); 1236 goto loopend; 1237 1238 } 1239 1240 /* proceed with the next header. */ 1241 off += elen; 1242 nxt = ip6e->ip6e_nxt; 1243 ip6e = NULL; 1244 m_freem(ext); 1245 ext = NULL; 1246 } 1247 loopend: 1248 ; 1249 } 1250 } 1251 #undef IS2292 1252 1253 1254 void 1255 ip6_notify_pmtu(struct in6pcb *in6p, const struct sockaddr_in6 *dst, 1256 uint32_t *mtu) 1257 { 1258 struct socket *so; 1259 struct mbuf *m_mtu; 1260 struct ip6_mtuinfo mtuctl; 1261 1262 so = in6p->in6p_socket; 1263 1264 if (mtu == NULL) 1265 return; 1266 1267 #ifdef DIAGNOSTIC 1268 if (so == NULL) /* I believe this is impossible */ 1269 panic("ip6_notify_pmtu: socket is NULL"); 1270 #endif 1271 1272 memset(&mtuctl, 0, sizeof(mtuctl)); /* zero-clear for safety */ 1273 mtuctl.ip6m_mtu = *mtu; 1274 mtuctl.ip6m_addr = *dst; 1275 if (sa6_recoverscope(&mtuctl.ip6m_addr)) 1276 return; 1277 1278 if ((m_mtu = sbcreatecontrol((void *)&mtuctl, sizeof(mtuctl), 1279 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL) 1280 return; 1281 1282 if (sbappendaddr(&so->so_rcv, (const struct sockaddr *)dst, NULL, m_mtu) 1283 == 0) { 1284 m_freem(m_mtu); 1285 /* XXX: should count statistics */ 1286 } else 1287 sorwakeup(so); 1288 1289 return; 1290 } 1291 1292 /* 1293 * pull single extension header from mbuf chain. returns single mbuf that 1294 * contains the result, or NULL on error. 1295 */ 1296 static struct mbuf * 1297 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt) 1298 { 1299 struct ip6_ext ip6e; 1300 size_t elen; 1301 struct mbuf *n; 1302 1303 #ifdef DIAGNOSTIC 1304 switch (nxt) { 1305 case IPPROTO_DSTOPTS: 1306 case IPPROTO_ROUTING: 1307 case IPPROTO_HOPOPTS: 1308 case IPPROTO_AH: /* is it possible? */ 1309 break; 1310 default: 1311 printf("ip6_pullexthdr: invalid nxt=%d\n", nxt); 1312 } 1313 #endif 1314 1315 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1316 if (nxt == IPPROTO_AH) 1317 elen = (ip6e.ip6e_len + 2) << 2; 1318 else 1319 elen = (ip6e.ip6e_len + 1) << 3; 1320 1321 MGET(n, M_DONTWAIT, MT_DATA); 1322 if (n && elen >= MLEN) { 1323 MCLGET(n, M_DONTWAIT); 1324 if ((n->m_flags & M_EXT) == 0) { 1325 m_free(n); 1326 n = NULL; 1327 } 1328 } 1329 if (!n) 1330 return NULL; 1331 1332 n->m_len = 0; 1333 if (elen >= M_TRAILINGSPACE(n)) { 1334 m_free(n); 1335 return NULL; 1336 } 1337 1338 m_copydata(m, off, elen, mtod(n, void *)); 1339 n->m_len = elen; 1340 return n; 1341 } 1342 1343 /* 1344 * Get pointer to the previous header followed by the header 1345 * currently processed. 1346 * XXX: This function supposes that 1347 * M includes all headers, 1348 * the next header field and the header length field of each header 1349 * are valid, and 1350 * the sum of each header length equals to OFF. 1351 * Because of these assumptions, this function must be called very 1352 * carefully. Moreover, it will not be used in the near future when 1353 * we develop `neater' mechanism to process extension headers. 1354 */ 1355 u_int8_t * 1356 ip6_get_prevhdr(struct mbuf *m, int off) 1357 { 1358 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1359 1360 if (off == sizeof(struct ip6_hdr)) 1361 return (&ip6->ip6_nxt); 1362 else { 1363 int len, nxt; 1364 struct ip6_ext *ip6e = NULL; 1365 1366 nxt = ip6->ip6_nxt; 1367 len = sizeof(struct ip6_hdr); 1368 while (len < off) { 1369 ip6e = (struct ip6_ext *)(mtod(m, char *) + len); 1370 1371 switch (nxt) { 1372 case IPPROTO_FRAGMENT: 1373 len += sizeof(struct ip6_frag); 1374 break; 1375 case IPPROTO_AH: 1376 len += (ip6e->ip6e_len + 2) << 2; 1377 break; 1378 default: 1379 len += (ip6e->ip6e_len + 1) << 3; 1380 break; 1381 } 1382 nxt = ip6e->ip6e_nxt; 1383 } 1384 if (ip6e) 1385 return (&ip6e->ip6e_nxt); 1386 else 1387 return NULL; 1388 } 1389 } 1390 1391 /* 1392 * get next header offset. m will be retained. 1393 */ 1394 int 1395 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp) 1396 { 1397 struct ip6_hdr ip6; 1398 struct ip6_ext ip6e; 1399 struct ip6_frag fh; 1400 1401 /* just in case */ 1402 if (m == NULL) 1403 panic("ip6_nexthdr: m == NULL"); 1404 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off) 1405 return -1; 1406 1407 switch (proto) { 1408 case IPPROTO_IPV6: 1409 /* do not chase beyond intermediate IPv6 headers */ 1410 if (off != 0) 1411 return -1; 1412 if (m->m_pkthdr.len < off + sizeof(ip6)) 1413 return -1; 1414 m_copydata(m, off, sizeof(ip6), (void *)&ip6); 1415 if (nxtp) 1416 *nxtp = ip6.ip6_nxt; 1417 off += sizeof(ip6); 1418 return off; 1419 1420 case IPPROTO_FRAGMENT: 1421 /* 1422 * terminate parsing if it is not the first fragment, 1423 * it does not make sense to parse through it. 1424 */ 1425 if (m->m_pkthdr.len < off + sizeof(fh)) 1426 return -1; 1427 m_copydata(m, off, sizeof(fh), (void *)&fh); 1428 if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0) 1429 return -1; 1430 if (nxtp) 1431 *nxtp = fh.ip6f_nxt; 1432 off += sizeof(struct ip6_frag); 1433 return off; 1434 1435 case IPPROTO_AH: 1436 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1437 return -1; 1438 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1439 if (nxtp) 1440 *nxtp = ip6e.ip6e_nxt; 1441 off += (ip6e.ip6e_len + 2) << 2; 1442 if (m->m_pkthdr.len < off) 1443 return -1; 1444 return off; 1445 1446 case IPPROTO_HOPOPTS: 1447 case IPPROTO_ROUTING: 1448 case IPPROTO_DSTOPTS: 1449 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1450 return -1; 1451 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1452 if (nxtp) 1453 *nxtp = ip6e.ip6e_nxt; 1454 off += (ip6e.ip6e_len + 1) << 3; 1455 if (m->m_pkthdr.len < off) 1456 return -1; 1457 return off; 1458 1459 case IPPROTO_NONE: 1460 case IPPROTO_ESP: 1461 case IPPROTO_IPCOMP: 1462 /* give up */ 1463 return -1; 1464 1465 default: 1466 return -1; 1467 } 1468 } 1469 1470 /* 1471 * get offset for the last header in the chain. m will be kept untainted. 1472 */ 1473 int 1474 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp) 1475 { 1476 int newoff; 1477 int nxt; 1478 1479 if (!nxtp) { 1480 nxt = -1; 1481 nxtp = &nxt; 1482 } 1483 for (;;) { 1484 newoff = ip6_nexthdr(m, off, proto, nxtp); 1485 if (newoff < 0) 1486 return off; 1487 else if (newoff < off) 1488 return -1; /* invalid */ 1489 else if (newoff == off) 1490 return newoff; 1491 1492 off = newoff; 1493 proto = *nxtp; 1494 } 1495 } 1496 1497 struct m_tag * 1498 ip6_addaux(struct mbuf *m) 1499 { 1500 struct m_tag *mtag; 1501 1502 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1503 if (!mtag) { 1504 mtag = m_tag_get(PACKET_TAG_INET6, sizeof(struct ip6aux), 1505 M_NOWAIT); 1506 if (mtag) { 1507 m_tag_prepend(m, mtag); 1508 memset(mtag + 1, 0, sizeof(struct ip6aux)); 1509 } 1510 } 1511 return mtag; 1512 } 1513 1514 struct m_tag * 1515 ip6_findaux(struct mbuf *m) 1516 { 1517 struct m_tag *mtag; 1518 1519 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1520 return mtag; 1521 } 1522 1523 void 1524 ip6_delaux(struct mbuf *m) 1525 { 1526 struct m_tag *mtag; 1527 1528 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1529 if (mtag) 1530 m_tag_delete(m, mtag); 1531 } 1532 1533 #ifdef GATEWAY 1534 /* 1535 * sysctl helper routine for net.inet.ip6.maxflows. Since 1536 * we could reduce this value, call ip6flow_reap(); 1537 */ 1538 static int 1539 sysctl_net_inet6_ip6_maxflows(SYSCTLFN_ARGS) 1540 { 1541 int error; 1542 1543 error = sysctl_lookup(SYSCTLFN_CALL(rnode)); 1544 if (error || newp == NULL) 1545 return (error); 1546 1547 mutex_enter(softnet_lock); 1548 KERNEL_LOCK(1, NULL); 1549 1550 ip6flow_reap(0); 1551 1552 KERNEL_UNLOCK_ONE(NULL); 1553 mutex_exit(softnet_lock); 1554 1555 return (0); 1556 } 1557 1558 static int 1559 sysctl_net_inet6_ip6_hashsize(SYSCTLFN_ARGS) 1560 { 1561 int error, tmp; 1562 struct sysctlnode node; 1563 1564 node = *rnode; 1565 tmp = ip6_hashsize; 1566 node.sysctl_data = &tmp; 1567 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 1568 if (error || newp == NULL) 1569 return (error); 1570 1571 if ((tmp & (tmp - 1)) == 0 && tmp != 0) { 1572 /* 1573 * Can only fail due to malloc() 1574 */ 1575 mutex_enter(softnet_lock); 1576 KERNEL_LOCK(1, NULL); 1577 1578 error = ip6flow_invalidate_all(tmp); 1579 1580 KERNEL_UNLOCK_ONE(NULL); 1581 mutex_exit(softnet_lock); 1582 } else { 1583 /* 1584 * EINVAL if not a power of 2 1585 */ 1586 error = EINVAL; 1587 } 1588 1589 return error; 1590 } 1591 #endif /* GATEWAY */ 1592 1593 /* 1594 * System control for IP6 1595 */ 1596 1597 const u_char inet6ctlerrmap[PRC_NCMDS] = { 1598 0, 0, 0, 0, 1599 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 1600 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 1601 EMSGSIZE, EHOSTUNREACH, 0, 0, 1602 0, 0, 0, 0, 1603 ENOPROTOOPT 1604 }; 1605 1606 extern int sysctl_net_inet6_addrctlpolicy(SYSCTLFN_ARGS); 1607 1608 static int 1609 sysctl_net_inet6_ip6_stats(SYSCTLFN_ARGS) 1610 { 1611 1612 return (NETSTAT_SYSCTL(ip6stat_percpu, IP6_NSTATS)); 1613 } 1614 1615 static void 1616 sysctl_net_inet6_ip6_setup(struct sysctllog **clog) 1617 { 1618 #ifdef RFC2292 1619 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y)) 1620 #else 1621 #define IS2292(x, y) (y) 1622 #endif 1623 1624 sysctl_createv(clog, 0, NULL, NULL, 1625 CTLFLAG_PERMANENT, 1626 CTLTYPE_NODE, "inet6", 1627 SYSCTL_DESCR("PF_INET6 related settings"), 1628 NULL, 0, NULL, 0, 1629 CTL_NET, PF_INET6, CTL_EOL); 1630 sysctl_createv(clog, 0, NULL, NULL, 1631 CTLFLAG_PERMANENT, 1632 CTLTYPE_NODE, "ip6", 1633 SYSCTL_DESCR("IPv6 related settings"), 1634 NULL, 0, NULL, 0, 1635 CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_EOL); 1636 1637 sysctl_createv(clog, 0, NULL, NULL, 1638 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1639 CTLTYPE_INT, "forwarding", 1640 SYSCTL_DESCR("Enable forwarding of INET6 datagrams"), 1641 NULL, 0, &ip6_forwarding, 0, 1642 CTL_NET, PF_INET6, IPPROTO_IPV6, 1643 IPV6CTL_FORWARDING, CTL_EOL); 1644 sysctl_createv(clog, 0, NULL, NULL, 1645 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1646 CTLTYPE_INT, "redirect", 1647 SYSCTL_DESCR("Enable sending of ICMPv6 redirect messages"), 1648 NULL, 0, &ip6_sendredirects, 0, 1649 CTL_NET, PF_INET6, IPPROTO_IPV6, 1650 IPV6CTL_SENDREDIRECTS, CTL_EOL); 1651 sysctl_createv(clog, 0, NULL, NULL, 1652 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1653 CTLTYPE_INT, "hlim", 1654 SYSCTL_DESCR("Hop limit for an INET6 datagram"), 1655 NULL, 0, &ip6_defhlim, 0, 1656 CTL_NET, PF_INET6, IPPROTO_IPV6, 1657 IPV6CTL_DEFHLIM, CTL_EOL); 1658 #ifdef notyet 1659 sysctl_createv(clog, 0, NULL, NULL, 1660 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1661 CTLTYPE_INT, "mtu", NULL, 1662 NULL, 0, &, 0, 1663 CTL_NET, PF_INET6, IPPROTO_IPV6, 1664 IPV6CTL_DEFMTU, CTL_EOL); 1665 #endif 1666 #ifdef __no_idea__ 1667 sysctl_createv(clog, 0, NULL, NULL, 1668 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1669 CTLTYPE_INT, "forwsrcrt", NULL, 1670 NULL, 0, &?, 0, 1671 CTL_NET, PF_INET6, IPPROTO_IPV6, 1672 IPV6CTL_FORWSRCRT, CTL_EOL); 1673 sysctl_createv(clog, 0, NULL, NULL, 1674 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1675 CTLTYPE_STRUCT, "mrtstats", NULL, 1676 NULL, 0, &?, sizeof(?), 1677 CTL_NET, PF_INET6, IPPROTO_IPV6, 1678 IPV6CTL_MRTSTATS, CTL_EOL); 1679 sysctl_createv(clog, 0, NULL, NULL, 1680 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1681 CTLTYPE_?, "mrtproto", NULL, 1682 NULL, 0, &?, sizeof(?), 1683 CTL_NET, PF_INET6, IPPROTO_IPV6, 1684 IPV6CTL_MRTPROTO, CTL_EOL); 1685 #endif 1686 sysctl_createv(clog, 0, NULL, NULL, 1687 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1688 CTLTYPE_INT, "maxfragpackets", 1689 SYSCTL_DESCR("Maximum number of fragments to buffer " 1690 "for reassembly"), 1691 NULL, 0, &ip6_maxfragpackets, 0, 1692 CTL_NET, PF_INET6, IPPROTO_IPV6, 1693 IPV6CTL_MAXFRAGPACKETS, CTL_EOL); 1694 #ifdef __no_idea__ 1695 sysctl_createv(clog, 0, NULL, NULL, 1696 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1697 CTLTYPE_INT, "sourcecheck", NULL, 1698 NULL, 0, &?, 0, 1699 CTL_NET, PF_INET6, IPPROTO_IPV6, 1700 IPV6CTL_SOURCECHECK, CTL_EOL); 1701 sysctl_createv(clog, 0, NULL, NULL, 1702 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1703 CTLTYPE_INT, "sourcecheck_logint", NULL, 1704 NULL, 0, &?, 0, 1705 CTL_NET, PF_INET6, IPPROTO_IPV6, 1706 IPV6CTL_SOURCECHECK_LOGINT, CTL_EOL); 1707 #endif 1708 sysctl_createv(clog, 0, NULL, NULL, 1709 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1710 CTLTYPE_INT, "accept_rtadv", 1711 SYSCTL_DESCR("Accept router advertisements"), 1712 NULL, 0, &ip6_accept_rtadv, 0, 1713 CTL_NET, PF_INET6, IPPROTO_IPV6, 1714 IPV6CTL_ACCEPT_RTADV, CTL_EOL); 1715 sysctl_createv(clog, 0, NULL, NULL, 1716 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1717 CTLTYPE_INT, "rtadv_maxroutes", 1718 SYSCTL_DESCR("Maximum number of routes accepted via router advertisements"), 1719 NULL, 0, &ip6_rtadv_maxroutes, 0, 1720 CTL_NET, PF_INET6, IPPROTO_IPV6, 1721 IPV6CTL_RTADV_MAXROUTES, CTL_EOL); 1722 sysctl_createv(clog, 0, NULL, NULL, 1723 CTLFLAG_PERMANENT, 1724 CTLTYPE_INT, "rtadv_numroutes", 1725 SYSCTL_DESCR("Current number of routes accepted via router advertisements"), 1726 NULL, 0, &nd6_numroutes, 0, 1727 CTL_NET, PF_INET6, IPPROTO_IPV6, 1728 IPV6CTL_RTADV_NUMROUTES, CTL_EOL); 1729 sysctl_createv(clog, 0, NULL, NULL, 1730 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1731 CTLTYPE_INT, "keepfaith", 1732 SYSCTL_DESCR("Activate faith interface"), 1733 NULL, 0, &ip6_keepfaith, 0, 1734 CTL_NET, PF_INET6, IPPROTO_IPV6, 1735 IPV6CTL_KEEPFAITH, CTL_EOL); 1736 sysctl_createv(clog, 0, NULL, NULL, 1737 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1738 CTLTYPE_INT, "log_interval", 1739 SYSCTL_DESCR("Minumum interval between logging " 1740 "unroutable packets"), 1741 NULL, 0, &ip6_log_interval, 0, 1742 CTL_NET, PF_INET6, IPPROTO_IPV6, 1743 IPV6CTL_LOG_INTERVAL, CTL_EOL); 1744 sysctl_createv(clog, 0, NULL, NULL, 1745 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1746 CTLTYPE_INT, "hdrnestlimit", 1747 SYSCTL_DESCR("Maximum number of nested IPv6 headers"), 1748 NULL, 0, &ip6_hdrnestlimit, 0, 1749 CTL_NET, PF_INET6, IPPROTO_IPV6, 1750 IPV6CTL_HDRNESTLIMIT, CTL_EOL); 1751 sysctl_createv(clog, 0, NULL, NULL, 1752 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1753 CTLTYPE_INT, "dad_count", 1754 SYSCTL_DESCR("Number of Duplicate Address Detection " 1755 "probes to send"), 1756 NULL, 0, &ip6_dad_count, 0, 1757 CTL_NET, PF_INET6, IPPROTO_IPV6, 1758 IPV6CTL_DAD_COUNT, CTL_EOL); 1759 sysctl_createv(clog, 0, NULL, NULL, 1760 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1761 CTLTYPE_INT, "auto_flowlabel", 1762 SYSCTL_DESCR("Assign random IPv6 flow labels"), 1763 NULL, 0, &ip6_auto_flowlabel, 0, 1764 CTL_NET, PF_INET6, IPPROTO_IPV6, 1765 IPV6CTL_AUTO_FLOWLABEL, CTL_EOL); 1766 sysctl_createv(clog, 0, NULL, NULL, 1767 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1768 CTLTYPE_INT, "defmcasthlim", 1769 SYSCTL_DESCR("Default multicast hop limit"), 1770 NULL, 0, &ip6_defmcasthlim, 0, 1771 CTL_NET, PF_INET6, IPPROTO_IPV6, 1772 IPV6CTL_DEFMCASTHLIM, CTL_EOL); 1773 sysctl_createv(clog, 0, NULL, NULL, 1774 CTLFLAG_PERMANENT, 1775 CTLTYPE_STRING, "kame_version", 1776 SYSCTL_DESCR("KAME Version"), 1777 NULL, 0, __UNCONST(__KAME_VERSION), 0, 1778 CTL_NET, PF_INET6, IPPROTO_IPV6, 1779 IPV6CTL_KAME_VERSION, CTL_EOL); 1780 sysctl_createv(clog, 0, NULL, NULL, 1781 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1782 CTLTYPE_INT, "use_deprecated", 1783 SYSCTL_DESCR("Allow use of deprecated addresses as " 1784 "source addresses"), 1785 NULL, 0, &ip6_use_deprecated, 0, 1786 CTL_NET, PF_INET6, IPPROTO_IPV6, 1787 IPV6CTL_USE_DEPRECATED, CTL_EOL); 1788 sysctl_createv(clog, 0, NULL, NULL, 1789 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1790 CTLTYPE_INT, "rr_prune", NULL, 1791 NULL, 0, &ip6_rr_prune, 0, 1792 CTL_NET, PF_INET6, IPPROTO_IPV6, 1793 IPV6CTL_RR_PRUNE, CTL_EOL); 1794 sysctl_createv(clog, 0, NULL, NULL, 1795 CTLFLAG_PERMANENT 1796 #ifndef INET6_BINDV6ONLY 1797 |CTLFLAG_READWRITE, 1798 #endif 1799 CTLTYPE_INT, "v6only", 1800 SYSCTL_DESCR("Disallow PF_INET6 sockets from connecting " 1801 "to PF_INET sockets"), 1802 NULL, 0, &ip6_v6only, 0, 1803 CTL_NET, PF_INET6, IPPROTO_IPV6, 1804 IPV6CTL_V6ONLY, CTL_EOL); 1805 sysctl_createv(clog, 0, NULL, NULL, 1806 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1807 CTLTYPE_INT, "anonportmin", 1808 SYSCTL_DESCR("Lowest ephemeral port number to assign"), 1809 sysctl_net_inet_ip_ports, 0, &ip6_anonportmin, 0, 1810 CTL_NET, PF_INET6, IPPROTO_IPV6, 1811 IPV6CTL_ANONPORTMIN, CTL_EOL); 1812 sysctl_createv(clog, 0, NULL, NULL, 1813 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1814 CTLTYPE_INT, "anonportmax", 1815 SYSCTL_DESCR("Highest ephemeral port number to assign"), 1816 sysctl_net_inet_ip_ports, 0, &ip6_anonportmax, 0, 1817 CTL_NET, PF_INET6, IPPROTO_IPV6, 1818 IPV6CTL_ANONPORTMAX, CTL_EOL); 1819 #ifndef IPNOPRIVPORTS 1820 sysctl_createv(clog, 0, NULL, NULL, 1821 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1822 CTLTYPE_INT, "lowportmin", 1823 SYSCTL_DESCR("Lowest privileged ephemeral port number " 1824 "to assign"), 1825 sysctl_net_inet_ip_ports, 0, &ip6_lowportmin, 0, 1826 CTL_NET, PF_INET6, IPPROTO_IPV6, 1827 IPV6CTL_LOWPORTMIN, CTL_EOL); 1828 sysctl_createv(clog, 0, NULL, NULL, 1829 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1830 CTLTYPE_INT, "lowportmax", 1831 SYSCTL_DESCR("Highest privileged ephemeral port number " 1832 "to assign"), 1833 sysctl_net_inet_ip_ports, 0, &ip6_lowportmax, 0, 1834 CTL_NET, PF_INET6, IPPROTO_IPV6, 1835 IPV6CTL_LOWPORTMAX, CTL_EOL); 1836 #endif /* IPNOPRIVPORTS */ 1837 sysctl_createv(clog, 0, NULL, NULL, 1838 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1839 CTLTYPE_INT, "auto_linklocal", 1840 SYSCTL_DESCR("Default value of per-interface flag for " 1841 "adding an IPv6 link-local address to " 1842 "interfaces when attached"), 1843 NULL, 0, &ip6_auto_linklocal, 0, 1844 CTL_NET, PF_INET6, IPPROTO_IPV6, 1845 IPV6CTL_AUTO_LINKLOCAL, CTL_EOL); 1846 sysctl_createv(clog, 0, NULL, NULL, 1847 CTLFLAG_PERMANENT|CTLFLAG_READONLY, 1848 CTLTYPE_STRUCT, "addctlpolicy", 1849 SYSCTL_DESCR("Return the current address control" 1850 " policy"), 1851 sysctl_net_inet6_addrctlpolicy, 0, NULL, 0, 1852 CTL_NET, PF_INET6, IPPROTO_IPV6, 1853 IPV6CTL_ADDRCTLPOLICY, CTL_EOL); 1854 sysctl_createv(clog, 0, NULL, NULL, 1855 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1856 CTLTYPE_INT, "use_tempaddr", 1857 SYSCTL_DESCR("Use temporary address"), 1858 NULL, 0, &ip6_use_tempaddr, 0, 1859 CTL_NET, PF_INET6, IPPROTO_IPV6, 1860 CTL_CREATE, CTL_EOL); 1861 sysctl_createv(clog, 0, NULL, NULL, 1862 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1863 CTLTYPE_INT, "prefer_tempaddr", 1864 SYSCTL_DESCR("Prefer temporary address as source " 1865 "address"), 1866 NULL, 0, &ip6_prefer_tempaddr, 0, 1867 CTL_NET, PF_INET6, IPPROTO_IPV6, 1868 CTL_CREATE, CTL_EOL); 1869 sysctl_createv(clog, 0, NULL, NULL, 1870 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1871 CTLTYPE_INT, "temppltime", 1872 SYSCTL_DESCR("preferred lifetime of a temporary address"), 1873 NULL, 0, &ip6_temp_preferred_lifetime, 0, 1874 CTL_NET, PF_INET6, IPPROTO_IPV6, 1875 CTL_CREATE, CTL_EOL); 1876 sysctl_createv(clog, 0, NULL, NULL, 1877 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1878 CTLTYPE_INT, "tempvltime", 1879 SYSCTL_DESCR("valid lifetime of a temporary address"), 1880 NULL, 0, &ip6_temp_valid_lifetime, 0, 1881 CTL_NET, PF_INET6, IPPROTO_IPV6, 1882 CTL_CREATE, CTL_EOL); 1883 sysctl_createv(clog, 0, NULL, NULL, 1884 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1885 CTLTYPE_INT, "maxfrags", 1886 SYSCTL_DESCR("Maximum fragments in reassembly queue"), 1887 NULL, 0, &ip6_maxfrags, 0, 1888 CTL_NET, PF_INET6, IPPROTO_IPV6, 1889 IPV6CTL_MAXFRAGS, CTL_EOL); 1890 sysctl_createv(clog, 0, NULL, NULL, 1891 CTLFLAG_PERMANENT, 1892 CTLTYPE_STRUCT, "stats", 1893 SYSCTL_DESCR("IPv6 statistics"), 1894 sysctl_net_inet6_ip6_stats, 0, NULL, 0, 1895 CTL_NET, PF_INET6, IPPROTO_IPV6, 1896 IPV6CTL_STATS, CTL_EOL); 1897 sysctl_createv(clog, 0, NULL, NULL, 1898 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1899 CTLTYPE_INT, "use_defaultzone", 1900 SYSCTL_DESCR("Whether to use the default scope zones"), 1901 NULL, 0, &ip6_use_defzone, 0, 1902 CTL_NET, PF_INET6, IPPROTO_IPV6, 1903 IPV6CTL_USE_DEFAULTZONE, CTL_EOL); 1904 sysctl_createv(clog, 0, NULL, NULL, 1905 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1906 CTLTYPE_INT, "mcast_pmtu", 1907 SYSCTL_DESCR("Enable pMTU discovery for multicast packet"), 1908 NULL, 0, &ip6_mcast_pmtu, 0, 1909 CTL_NET, PF_INET6, IPPROTO_IPV6, 1910 CTL_CREATE, CTL_EOL); 1911 #ifdef GATEWAY 1912 sysctl_createv(clog, 0, NULL, NULL, 1913 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1914 CTLTYPE_INT, "maxflows", 1915 SYSCTL_DESCR("Number of flows for fast forwarding (IPv6)"), 1916 sysctl_net_inet6_ip6_maxflows, 0, &ip6_maxflows, 0, 1917 CTL_NET, PF_INET6, IPPROTO_IPV6, 1918 CTL_CREATE, CTL_EOL); 1919 sysctl_createv(clog, 0, NULL, NULL, 1920 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1921 CTLTYPE_INT, "hashsize", 1922 SYSCTL_DESCR("Size of hash table for fast forwarding (IPv6)"), 1923 sysctl_net_inet6_ip6_hashsize, 0, &ip6_hashsize, 0, 1924 CTL_NET, PF_INET6, IPPROTO_IPV6, 1925 CTL_CREATE, CTL_EOL); 1926 #endif 1927 /* anonportalgo RFC6056 subtree */ 1928 const struct sysctlnode *portalgo_node; 1929 sysctl_createv(clog, 0, NULL, &portalgo_node, 1930 CTLFLAG_PERMANENT, 1931 CTLTYPE_NODE, "anonportalgo", 1932 SYSCTL_DESCR("Anonymous port algorithm selection (RFC 6056)"), 1933 NULL, 0, NULL, 0, 1934 CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_CREATE, CTL_EOL); 1935 sysctl_createv(clog, 0, &portalgo_node, NULL, 1936 CTLFLAG_PERMANENT, 1937 CTLTYPE_STRING, "available", 1938 SYSCTL_DESCR("available algorithms"), 1939 sysctl_portalgo_available, 0, NULL, PORTALGO_MAXLEN, 1940 CTL_CREATE, CTL_EOL); 1941 sysctl_createv(clog, 0, &portalgo_node, NULL, 1942 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1943 CTLTYPE_STRING, "selected", 1944 SYSCTL_DESCR("selected algorithm"), 1945 sysctl_portalgo_selected6, 0, NULL, PORTALGO_MAXLEN, 1946 CTL_CREATE, CTL_EOL); 1947 sysctl_createv(clog, 0, &portalgo_node, NULL, 1948 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1949 CTLTYPE_STRUCT, "reserve", 1950 SYSCTL_DESCR("bitmap of reserved ports"), 1951 sysctl_portalgo_reserve6, 0, NULL, 0, 1952 CTL_CREATE, CTL_EOL); 1953 sysctl_createv(clog, 0, NULL, NULL, 1954 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1955 CTLTYPE_INT, "neighborgcthresh", 1956 SYSCTL_DESCR("Maximum number of entries in neighbor" 1957 " cache"), 1958 NULL, 1, &ip6_neighborgcthresh, 0, 1959 CTL_NET, PF_INET6, IPPROTO_IPV6, 1960 CTL_CREATE, CTL_EOL); 1961 sysctl_createv(clog, 0, NULL, NULL, 1962 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1963 CTLTYPE_INT, "maxifprefixes", 1964 SYSCTL_DESCR("Maximum number of prefixes created by" 1965 " route advertisement per interface"), 1966 NULL, 1, &ip6_maxifprefixes, 0, 1967 CTL_NET, PF_INET6, IPPROTO_IPV6, 1968 CTL_CREATE, CTL_EOL); 1969 sysctl_createv(clog, 0, NULL, NULL, 1970 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1971 CTLTYPE_INT, "maxifdefrouters", 1972 SYSCTL_DESCR("Maximum number of default routers created" 1973 " by route advertisement per interface"), 1974 NULL, 1, &ip6_maxifdefrouters, 0, 1975 CTL_NET, PF_INET6, IPPROTO_IPV6, 1976 CTL_CREATE, CTL_EOL); 1977 sysctl_createv(clog, 0, NULL, NULL, 1978 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1979 CTLTYPE_INT, "maxdynroutes", 1980 SYSCTL_DESCR("Maximum number of routes created via" 1981 " redirect"), 1982 NULL, 1, &ip6_maxdynroutes, 0, 1983 CTL_NET, PF_INET6, IPPROTO_IPV6, 1984 CTL_CREATE, CTL_EOL); 1985 } 1986 1987 void 1988 ip6_statinc(u_int stat) 1989 { 1990 1991 KASSERT(stat < IP6_NSTATS); 1992 IP6_STATINC(stat); 1993 } 1994
Indexes created Wed Sep 24 15:09:51 GMT 2025