ip6_input.c revision 1.159
1 /* $NetBSD: ip6_input.c,v 1.159 2016/05/19 08:53:25 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 1.159 2016/05/19 08:53:25 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 struct in6_ifaddr *in6_ifaddr; 137 pktqueue_t *ip6_pktq __read_mostly; 138 139 int ip6_forward_srcrt; /* XXX */ 140 int ip6_sourcecheck; /* XXX */ 141 int ip6_sourcecheck_interval; /* XXX */ 142 143 pfil_head_t *inet6_pfil_hook; 144 145 percpu_t *ip6stat_percpu; 146 147 static void ip6_init2(void); 148 static void ip6intr(void *); 149 static struct m_tag *ip6_setdstifaddr(struct mbuf *, const struct in6_ifaddr *); 150 151 static int ip6_process_hopopts(struct mbuf *, u_int8_t *, int, u_int32_t *, 152 u_int32_t *); 153 static struct mbuf *ip6_pullexthdr(struct mbuf *, size_t, int); 154 static void sysctl_net_inet6_ip6_setup(struct sysctllog **); 155 156 /* 157 * IP6 initialization: fill in IP6 protocol switch table. 158 * All protocols not implemented in kernel go to raw IP6 protocol handler. 159 */ 160 void 161 ip6_init(void) 162 { 163 const struct ip6protosw *pr; 164 int i; 165 166 sysctl_net_inet6_ip6_setup(NULL); 167 pr = (const struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 168 if (pr == 0) 169 panic("ip6_init"); 170 for (i = 0; i < IPPROTO_MAX; i++) 171 ip6_protox[i] = pr - inet6sw; 172 for (pr = (const struct ip6protosw *)inet6domain.dom_protosw; 173 pr < (const struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++) 174 if (pr->pr_domain->dom_family == PF_INET6 && 175 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) 176 ip6_protox[pr->pr_protocol] = pr - inet6sw; 177 178 ip6_pktq = pktq_create(IFQ_MAXLEN, ip6intr, NULL); 179 KASSERT(ip6_pktq != NULL); 180 181 scope6_init(); 182 addrsel_policy_init(); 183 nd6_init(); 184 frag6_init(); 185 ip6_desync_factor = cprng_fast32() % MAX_TEMP_DESYNC_FACTOR; 186 187 ip6_init2(); 188 #ifdef GATEWAY 189 ip6flow_init(ip6_hashsize); 190 #endif 191 /* Register our Packet Filter hook. */ 192 inet6_pfil_hook = pfil_head_create(PFIL_TYPE_AF, (void *)AF_INET6); 193 KASSERT(inet6_pfil_hook != NULL); 194 195 ip6stat_percpu = percpu_alloc(sizeof(uint64_t) * IP6_NSTATS); 196 } 197 198 static void 199 ip6_init2(void) 200 { 201 202 /* timer for regeneranation of temporary addresses randomize ID */ 203 callout_init(&in6_tmpaddrtimer_ch, CALLOUT_MPSAFE); 204 callout_reset(&in6_tmpaddrtimer_ch, 205 (ip6_temp_preferred_lifetime - ip6_desync_factor - 206 ip6_temp_regen_advance) * hz, 207 in6_tmpaddrtimer, NULL); 208 } 209 210 /* 211 * IP6 input interrupt handling. Just pass the packet to ip6_input. 212 */ 213 static void 214 ip6intr(void *arg __unused) 215 { 216 struct mbuf *m; 217 218 mutex_enter(softnet_lock); 219 while ((m = pktq_dequeue(ip6_pktq)) != NULL) { 220 const ifnet_t *ifp = m->m_pkthdr.rcvif; 221 222 /* 223 * Drop the packet if IPv6 is disabled on the interface. 224 */ 225 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)) { 226 m_freem(m); 227 continue; 228 } 229 ip6_input(m); 230 } 231 mutex_exit(softnet_lock); 232 } 233 234 extern struct route ip6_forward_rt; 235 236 void 237 ip6_input(struct mbuf *m) 238 { 239 struct ip6_hdr *ip6; 240 int hit, off = sizeof(struct ip6_hdr), nest; 241 u_int32_t plen; 242 u_int32_t rtalert = ~0; 243 int nxt, ours = 0, rh_present = 0; 244 struct ifnet *deliverifp = NULL; 245 int srcrt = 0; 246 const struct rtentry *rt; 247 union { 248 struct sockaddr dst; 249 struct sockaddr_in6 dst6; 250 } u; 251 struct ifnet *rcvif = m->m_pkthdr.rcvif; 252 253 /* 254 * make sure we don't have onion peering information into m_tag. 255 */ 256 ip6_delaux(m); 257 258 /* 259 * mbuf statistics 260 */ 261 if (m->m_flags & M_EXT) { 262 if (m->m_next) 263 IP6_STATINC(IP6_STAT_MEXT2M); 264 else 265 IP6_STATINC(IP6_STAT_MEXT1); 266 } else { 267 #define M2MMAX 32 268 if (m->m_next) { 269 if (m->m_flags & M_LOOP) 270 /*XXX*/ IP6_STATINC(IP6_STAT_M2M + lo0ifp->if_index); 271 else if (rcvif->if_index < M2MMAX) 272 IP6_STATINC(IP6_STAT_M2M + rcvif->if_index); 273 else 274 IP6_STATINC(IP6_STAT_M2M); 275 } else 276 IP6_STATINC(IP6_STAT_M1); 277 #undef M2MMAX 278 } 279 280 in6_ifstat_inc(rcvif, ifs6_in_receive); 281 IP6_STATINC(IP6_STAT_TOTAL); 282 283 /* 284 * If the IPv6 header is not aligned, slurp it up into a new 285 * mbuf with space for link headers, in the event we forward 286 * it. Otherwise, if it is aligned, make sure the entire base 287 * IPv6 header is in the first mbuf of the chain. 288 */ 289 if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 290 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 291 (max_linkhdr + 3) & ~3)) == NULL) { 292 /* XXXJRT new stat, please */ 293 IP6_STATINC(IP6_STAT_TOOSMALL); 294 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 295 return; 296 } 297 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 298 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 299 IP6_STATINC(IP6_STAT_TOOSMALL); 300 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 301 return; 302 } 303 } 304 305 ip6 = mtod(m, struct ip6_hdr *); 306 307 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 308 IP6_STATINC(IP6_STAT_BADVERS); 309 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 310 goto bad; 311 } 312 313 /* 314 * Assume that we can create a fast-forward IP flow entry 315 * based on this packet. 316 */ 317 m->m_flags |= M_CANFASTFWD; 318 319 /* 320 * Run through list of hooks for input packets. If there are any 321 * filters which require that additional packets in the flow are 322 * not fast-forwarded, they must clear the M_CANFASTFWD flag. 323 * Note that filters must _never_ set this flag, as another filter 324 * in the list may have previously cleared it. 325 */ 326 /* 327 * let ipfilter look at packet on the wire, 328 * not the decapsulated packet. 329 */ 330 #if defined(IPSEC) 331 if (!ipsec_used || !ipsec_indone(m)) 332 #else 333 if (1) 334 #endif 335 { 336 struct in6_addr odst; 337 338 odst = ip6->ip6_dst; 339 if (pfil_run_hooks(inet6_pfil_hook, &m, rcvif, PFIL_IN) != 0) 340 return; 341 if (m == NULL) 342 return; 343 ip6 = mtod(m, struct ip6_hdr *); 344 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst); 345 } 346 347 IP6_STATINC(IP6_STAT_NXTHIST + ip6->ip6_nxt); 348 349 #ifdef ALTQ 350 if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) { 351 /* packet is dropped by traffic conditioner */ 352 return; 353 } 354 #endif 355 356 /* 357 * Check against address spoofing/corruption. 358 */ 359 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) || 360 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) { 361 /* 362 * XXX: "badscope" is not very suitable for a multicast source. 363 */ 364 IP6_STATINC(IP6_STAT_BADSCOPE); 365 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 366 goto bad; 367 } 368 /* 369 * The following check is not documented in specs. A malicious 370 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack 371 * and bypass security checks (act as if it was from 127.0.0.1 by using 372 * IPv6 src ::ffff:127.0.0.1). Be cautious. 373 * 374 * This check chokes if we are in an SIIT cloud. As none of BSDs 375 * support IPv4-less kernel compilation, we cannot support SIIT 376 * environment at all. So, it makes more sense for us to reject any 377 * malicious packets for non-SIIT environment, than try to do a 378 * partial support for SIIT environment. 379 */ 380 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 381 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 382 IP6_STATINC(IP6_STAT_BADSCOPE); 383 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 384 goto bad; 385 } 386 #if 0 387 /* 388 * Reject packets with IPv4 compatible addresses (auto tunnel). 389 * 390 * The code forbids auto tunnel relay case in RFC1933 (the check is 391 * stronger than RFC1933). We may want to re-enable it if mech-xx 392 * is revised to forbid relaying case. 393 */ 394 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) || 395 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) { 396 IP6_STATINC(IP6_STAT_BADSCOPE); 397 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 398 goto bad; 399 } 400 #endif 401 402 /* 403 * Disambiguate address scope zones (if there is ambiguity). 404 * We first make sure that the original source or destination address 405 * is not in our internal form for scoped addresses. Such addresses 406 * are not necessarily invalid spec-wise, but we cannot accept them due 407 * to the usage conflict. 408 * in6_setscope() then also checks and rejects the cases where src or 409 * dst are the loopback address and the receiving interface 410 * is not loopback. 411 */ 412 if (__predict_false( 413 m_makewritable(&m, 0, sizeof(struct ip6_hdr), M_DONTWAIT))) 414 goto bad; 415 ip6 = mtod(m, struct ip6_hdr *); 416 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) { 417 IP6_STATINC(IP6_STAT_BADSCOPE); /* XXX */ 418 goto bad; 419 } 420 if (in6_setscope(&ip6->ip6_src, rcvif, NULL) || 421 in6_setscope(&ip6->ip6_dst, rcvif, NULL)) { 422 IP6_STATINC(IP6_STAT_BADSCOPE); 423 goto bad; 424 } 425 426 /* 427 * Multicast check 428 */ 429 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 430 struct in6_multi *in6m = 0; 431 432 in6_ifstat_inc(rcvif, ifs6_in_mcast); 433 /* 434 * See if we belong to the destination multicast group on the 435 * arrival interface. 436 */ 437 IN6_LOOKUP_MULTI(ip6->ip6_dst, rcvif, in6m); 438 if (in6m) 439 ours = 1; 440 else if (!ip6_mrouter) { 441 uint64_t *ip6s = IP6_STAT_GETREF(); 442 ip6s[IP6_STAT_NOTMEMBER]++; 443 ip6s[IP6_STAT_CANTFORWARD]++; 444 IP6_STAT_PUTREF(); 445 in6_ifstat_inc(rcvif, ifs6_in_discard); 446 goto bad; 447 } 448 deliverifp = rcvif; 449 goto hbhcheck; 450 } 451 452 sockaddr_in6_init(&u.dst6, &ip6->ip6_dst, 0, 0, 0); 453 454 /* 455 * Unicast check 456 */ 457 rt = rtcache_lookup2(&ip6_forward_rt, &u.dst, 1, &hit); 458 if (hit) 459 IP6_STATINC(IP6_STAT_FORWARD_CACHEHIT); 460 else 461 IP6_STATINC(IP6_STAT_FORWARD_CACHEMISS); 462 463 #define rt6_getkey(__rt) satocsin6(rt_getkey(__rt)) 464 465 /* 466 * Accept the packet if the forwarding interface to the destination 467 * according to the routing table is the loopback interface, 468 * unless the associated route has a gateway. 469 * Note that this approach causes to accept a packet if there is a 470 * route to the loopback interface for the destination of the packet. 471 * But we think it's even useful in some situations, e.g. when using 472 * a special daemon which wants to intercept the packet. 473 */ 474 if (rt != NULL && 475 (rt->rt_flags & (RTF_HOST|RTF_GATEWAY)) == RTF_HOST && 476 #if 0 477 /* 478 * The check below is redundant since the comparison of 479 * the destination and the key of the rtentry has 480 * already done through looking up the routing table. 481 */ 482 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &rt6_getkey(rt)->sin6_addr) && 483 #endif 484 rt->rt_ifp->if_type == IFT_LOOP) { 485 struct in6_ifaddr *ia6 = (struct in6_ifaddr *)rt->rt_ifa; 486 if (ia6->ia6_flags & IN6_IFF_ANYCAST) 487 m->m_flags |= M_ANYCAST6; 488 /* 489 * packets to a tentative, duplicated, or somehow invalid 490 * address must not be accepted. 491 */ 492 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) { 493 /* this address is ready */ 494 ours = 1; 495 deliverifp = ia6->ia_ifp; /* correct? */ 496 goto hbhcheck; 497 } else { 498 /* address is not ready, so discard the packet. */ 499 nd6log(LOG_INFO, "packet to an unready address %s->%s\n", 500 ip6_sprintf(&ip6->ip6_src), 501 ip6_sprintf(&ip6->ip6_dst)); 502 503 goto bad; 504 } 505 } 506 507 /* 508 * FAITH (Firewall Aided Internet Translator) 509 */ 510 #if defined(NFAITH) && 0 < NFAITH 511 if (ip6_keepfaith) { 512 if (rt != NULL && rt->rt_ifp != NULL && 513 rt->rt_ifp->if_type == IFT_FAITH) { 514 /* XXX do we need more sanity checks? */ 515 ours = 1; 516 deliverifp = rt->rt_ifp; /* faith */ 517 goto hbhcheck; 518 } 519 } 520 #endif 521 522 #if 0 523 { 524 /* 525 * Last resort: check in6_ifaddr for incoming interface. 526 * The code is here until I update the "goto ours hack" code above 527 * working right. 528 */ 529 struct ifaddr *ifa; 530 IFADDR_FOREACH(ifa, rcvif) { 531 if (ifa->ifa_addr == NULL) 532 continue; /* just for safety */ 533 if (ifa->ifa_addr->sa_family != AF_INET6) 534 continue; 535 if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) { 536 ours = 1; 537 deliverifp = ifa->ifa_ifp; 538 goto hbhcheck; 539 } 540 } 541 } 542 #endif 543 544 /* 545 * Now there is no reason to process the packet if it's not our own 546 * and we're not a router. 547 */ 548 if (!ip6_forwarding) { 549 IP6_STATINC(IP6_STAT_CANTFORWARD); 550 in6_ifstat_inc(rcvif, ifs6_in_discard); 551 goto bad; 552 } 553 554 hbhcheck: 555 /* 556 * record address information into m_tag, if we don't have one yet. 557 * note that we are unable to record it, if the address is not listed 558 * as our interface address (e.g. multicast addresses, addresses 559 * within FAITH prefixes and such). 560 */ 561 if (deliverifp && ip6_getdstifaddr(m) == NULL) { 562 struct in6_ifaddr *ia6; 563 564 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 565 if (ia6 != NULL && ip6_setdstifaddr(m, ia6) == NULL) { 566 /* 567 * XXX maybe we should drop the packet here, 568 * as we could not provide enough information 569 * to the upper layers. 570 */ 571 } 572 } 573 574 /* 575 * Process Hop-by-Hop options header if it's contained. 576 * m may be modified in ip6_hopopts_input(). 577 * If a JumboPayload option is included, plen will also be modified. 578 */ 579 plen = (u_int32_t)ntohs(ip6->ip6_plen); 580 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 581 struct ip6_hbh *hbh; 582 583 if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) { 584 #if 0 /*touches NULL pointer*/ 585 in6_ifstat_inc(rcvif, ifs6_in_discard); 586 #endif 587 return; /* m have already been freed */ 588 } 589 590 /* adjust pointer */ 591 ip6 = mtod(m, struct ip6_hdr *); 592 593 /* 594 * if the payload length field is 0 and the next header field 595 * indicates Hop-by-Hop Options header, then a Jumbo Payload 596 * option MUST be included. 597 */ 598 if (ip6->ip6_plen == 0 && plen == 0) { 599 /* 600 * Note that if a valid jumbo payload option is 601 * contained, ip6_hopopts_input() must set a valid 602 * (non-zero) payload length to the variable plen. 603 */ 604 IP6_STATINC(IP6_STAT_BADOPTIONS); 605 in6_ifstat_inc(rcvif, ifs6_in_discard); 606 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 607 icmp6_error(m, ICMP6_PARAM_PROB, 608 ICMP6_PARAMPROB_HEADER, 609 (char *)&ip6->ip6_plen - (char *)ip6); 610 return; 611 } 612 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 613 sizeof(struct ip6_hbh)); 614 if (hbh == NULL) { 615 IP6_STATINC(IP6_STAT_TOOSHORT); 616 return; 617 } 618 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 619 nxt = hbh->ip6h_nxt; 620 621 /* 622 * accept the packet if a router alert option is included 623 * and we act as an IPv6 router. 624 */ 625 if (rtalert != ~0 && ip6_forwarding) 626 ours = 1; 627 } else 628 nxt = ip6->ip6_nxt; 629 630 /* 631 * Check that the amount of data in the buffers 632 * is as at least much as the IPv6 header would have us expect. 633 * Trim mbufs if longer than we expect. 634 * Drop packet if shorter than we expect. 635 */ 636 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 637 IP6_STATINC(IP6_STAT_TOOSHORT); 638 in6_ifstat_inc(rcvif, ifs6_in_truncated); 639 goto bad; 640 } 641 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 642 if (m->m_len == m->m_pkthdr.len) { 643 m->m_len = sizeof(struct ip6_hdr) + plen; 644 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 645 } else 646 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 647 } 648 649 /* 650 * Forward if desirable. 651 */ 652 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 653 /* 654 * If we are acting as a multicast router, all 655 * incoming multicast packets are passed to the 656 * kernel-level multicast forwarding function. 657 * The packet is returned (relatively) intact; if 658 * ip6_mforward() returns a non-zero value, the packet 659 * must be discarded, else it may be accepted below. 660 */ 661 if (ip6_mrouter && ip6_mforward(ip6, rcvif, m)) { 662 IP6_STATINC(IP6_STAT_CANTFORWARD); 663 m_freem(m); 664 return; 665 } 666 if (!ours) { 667 m_freem(m); 668 return; 669 } 670 } else if (!ours) { 671 ip6_forward(m, srcrt); 672 return; 673 } 674 675 ip6 = mtod(m, struct ip6_hdr *); 676 677 /* 678 * Malicious party may be able to use IPv4 mapped addr to confuse 679 * tcp/udp stack and bypass security checks (act as if it was from 680 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious. 681 * 682 * For SIIT end node behavior, you may want to disable the check. 683 * However, you will become vulnerable to attacks using IPv4 mapped 684 * source. 685 */ 686 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 687 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 688 IP6_STATINC(IP6_STAT_BADSCOPE); 689 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 690 goto bad; 691 } 692 693 /* 694 * Tell launch routine the next header 695 */ 696 #ifdef IFA_STATS 697 if (deliverifp != NULL) { 698 struct in6_ifaddr *ia6; 699 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 700 if (ia6) 701 ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len; 702 } 703 #endif 704 IP6_STATINC(IP6_STAT_DELIVERED); 705 in6_ifstat_inc(deliverifp, ifs6_in_deliver); 706 nest = 0; 707 708 rh_present = 0; 709 while (nxt != IPPROTO_DONE) { 710 if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) { 711 IP6_STATINC(IP6_STAT_TOOMANYHDR); 712 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 713 goto bad; 714 } 715 716 /* 717 * protection against faulty packet - there should be 718 * more sanity checks in header chain processing. 719 */ 720 if (m->m_pkthdr.len < off) { 721 IP6_STATINC(IP6_STAT_TOOSHORT); 722 in6_ifstat_inc(rcvif, ifs6_in_truncated); 723 goto bad; 724 } 725 726 if (nxt == IPPROTO_ROUTING) { 727 if (rh_present++) { 728 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 729 IP6_STATINC(IP6_STAT_BADOPTIONS); 730 goto bad; 731 } 732 } 733 734 #ifdef IPSEC 735 if (ipsec_used) { 736 /* 737 * enforce IPsec policy checking if we are seeing last 738 * header. note that we do not visit this with 739 * protocols with pcb layer code - like udp/tcp/raw ip. 740 */ 741 if ((inet6sw[ip_protox[nxt]].pr_flags 742 & PR_LASTHDR) != 0) { 743 int error = ipsec6_input(m); 744 if (error) 745 goto bad; 746 } 747 } 748 #endif /* IPSEC */ 749 750 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt); 751 } 752 return; 753 bad: 754 m_freem(m); 755 } 756 757 /* 758 * set/grab in6_ifaddr correspond to IPv6 destination address. 759 */ 760 static struct m_tag * 761 ip6_setdstifaddr(struct mbuf *m, const struct in6_ifaddr *ia) 762 { 763 struct m_tag *mtag; 764 struct ip6aux *ip6a; 765 766 mtag = ip6_addaux(m); 767 if (mtag == NULL) 768 return NULL; 769 770 ip6a = (struct ip6aux *)(mtag + 1); 771 if (in6_setscope(&ip6a->ip6a_src, ia->ia_ifp, &ip6a->ip6a_scope_id)) { 772 IP6_STATINC(IP6_STAT_BADSCOPE); 773 return NULL; 774 } 775 776 ip6a->ip6a_src = ia->ia_addr.sin6_addr; 777 ip6a->ip6a_flags = ia->ia6_flags; 778 return mtag; 779 } 780 781 const struct ip6aux * 782 ip6_getdstifaddr(struct mbuf *m) 783 { 784 struct m_tag *mtag; 785 786 mtag = ip6_findaux(m); 787 if (mtag != NULL) 788 return (struct ip6aux *)(mtag + 1); 789 else 790 return NULL; 791 } 792 793 /* 794 * Hop-by-Hop options header processing. If a valid jumbo payload option is 795 * included, the real payload length will be stored in plenp. 796 * 797 * rtalertp - XXX: should be stored more smart way 798 */ 799 int 800 ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp, 801 struct mbuf **mp, int *offp) 802 { 803 struct mbuf *m = *mp; 804 int off = *offp, hbhlen; 805 struct ip6_hbh *hbh; 806 807 /* validation of the length of the header */ 808 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, 809 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh)); 810 if (hbh == NULL) { 811 IP6_STATINC(IP6_STAT_TOOSHORT); 812 return -1; 813 } 814 hbhlen = (hbh->ip6h_len + 1) << 3; 815 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 816 hbhlen); 817 if (hbh == NULL) { 818 IP6_STATINC(IP6_STAT_TOOSHORT); 819 return -1; 820 } 821 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 822 off += hbhlen; 823 hbhlen -= sizeof(struct ip6_hbh); 824 825 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 826 hbhlen, rtalertp, plenp) < 0) 827 return (-1); 828 829 *offp = off; 830 *mp = m; 831 return (0); 832 } 833 834 /* 835 * Search header for all Hop-by-hop options and process each option. 836 * This function is separate from ip6_hopopts_input() in order to 837 * handle a case where the sending node itself process its hop-by-hop 838 * options header. In such a case, the function is called from ip6_output(). 839 * 840 * The function assumes that hbh header is located right after the IPv6 header 841 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to 842 * opthead + hbhlen is located in continuous memory region. 843 */ 844 static int 845 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen, 846 u_int32_t *rtalertp, u_int32_t *plenp) 847 { 848 struct ip6_hdr *ip6; 849 int optlen = 0; 850 u_int8_t *opt = opthead; 851 u_int16_t rtalert_val; 852 u_int32_t jumboplen; 853 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh); 854 855 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 856 switch (*opt) { 857 case IP6OPT_PAD1: 858 optlen = 1; 859 break; 860 case IP6OPT_PADN: 861 if (hbhlen < IP6OPT_MINLEN) { 862 IP6_STATINC(IP6_STAT_TOOSMALL); 863 goto bad; 864 } 865 optlen = *(opt + 1) + 2; 866 break; 867 case IP6OPT_RTALERT: 868 /* XXX may need check for alignment */ 869 if (hbhlen < IP6OPT_RTALERT_LEN) { 870 IP6_STATINC(IP6_STAT_TOOSMALL); 871 goto bad; 872 } 873 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) { 874 /* XXX stat */ 875 icmp6_error(m, ICMP6_PARAM_PROB, 876 ICMP6_PARAMPROB_HEADER, 877 erroff + opt + 1 - opthead); 878 return (-1); 879 } 880 optlen = IP6OPT_RTALERT_LEN; 881 memcpy((void *)&rtalert_val, (void *)(opt + 2), 2); 882 *rtalertp = ntohs(rtalert_val); 883 break; 884 case IP6OPT_JUMBO: 885 /* XXX may need check for alignment */ 886 if (hbhlen < IP6OPT_JUMBO_LEN) { 887 IP6_STATINC(IP6_STAT_TOOSMALL); 888 goto bad; 889 } 890 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) { 891 /* XXX stat */ 892 icmp6_error(m, ICMP6_PARAM_PROB, 893 ICMP6_PARAMPROB_HEADER, 894 erroff + opt + 1 - opthead); 895 return (-1); 896 } 897 optlen = IP6OPT_JUMBO_LEN; 898 899 /* 900 * IPv6 packets that have non 0 payload length 901 * must not contain a jumbo payload option. 902 */ 903 ip6 = mtod(m, struct ip6_hdr *); 904 if (ip6->ip6_plen) { 905 IP6_STATINC(IP6_STAT_BADOPTIONS); 906 icmp6_error(m, ICMP6_PARAM_PROB, 907 ICMP6_PARAMPROB_HEADER, 908 erroff + opt - opthead); 909 return (-1); 910 } 911 912 /* 913 * We may see jumbolen in unaligned location, so 914 * we'd need to perform bcopy(). 915 */ 916 memcpy(&jumboplen, opt + 2, sizeof(jumboplen)); 917 jumboplen = (u_int32_t)htonl(jumboplen); 918 919 #if 1 920 /* 921 * if there are multiple jumbo payload options, 922 * *plenp will be non-zero and the packet will be 923 * rejected. 924 * the behavior may need some debate in ipngwg - 925 * multiple options does not make sense, however, 926 * there's no explicit mention in specification. 927 */ 928 if (*plenp != 0) { 929 IP6_STATINC(IP6_STAT_BADOPTIONS); 930 icmp6_error(m, ICMP6_PARAM_PROB, 931 ICMP6_PARAMPROB_HEADER, 932 erroff + opt + 2 - opthead); 933 return (-1); 934 } 935 #endif 936 937 /* 938 * jumbo payload length must be larger than 65535. 939 */ 940 if (jumboplen <= IPV6_MAXPACKET) { 941 IP6_STATINC(IP6_STAT_BADOPTIONS); 942 icmp6_error(m, ICMP6_PARAM_PROB, 943 ICMP6_PARAMPROB_HEADER, 944 erroff + opt + 2 - opthead); 945 return (-1); 946 } 947 *plenp = jumboplen; 948 949 break; 950 default: /* unknown option */ 951 if (hbhlen < IP6OPT_MINLEN) { 952 IP6_STATINC(IP6_STAT_TOOSMALL); 953 goto bad; 954 } 955 optlen = ip6_unknown_opt(opt, m, 956 erroff + opt - opthead); 957 if (optlen == -1) 958 return (-1); 959 optlen += 2; 960 break; 961 } 962 } 963 964 return (0); 965 966 bad: 967 m_freem(m); 968 return (-1); 969 } 970 971 /* 972 * Unknown option processing. 973 * The third argument `off' is the offset from the IPv6 header to the option, 974 * which is necessary if the IPv6 header the and option header and IPv6 header 975 * is not continuous in order to return an ICMPv6 error. 976 */ 977 int 978 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off) 979 { 980 struct ip6_hdr *ip6; 981 982 switch (IP6OPT_TYPE(*optp)) { 983 case IP6OPT_TYPE_SKIP: /* ignore the option */ 984 return ((int)*(optp + 1)); 985 case IP6OPT_TYPE_DISCARD: /* silently discard */ 986 m_freem(m); 987 return (-1); 988 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 989 IP6_STATINC(IP6_STAT_BADOPTIONS); 990 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 991 return (-1); 992 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 993 IP6_STATINC(IP6_STAT_BADOPTIONS); 994 ip6 = mtod(m, struct ip6_hdr *); 995 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 996 (m->m_flags & (M_BCAST|M_MCAST))) 997 m_freem(m); 998 else 999 icmp6_error(m, ICMP6_PARAM_PROB, 1000 ICMP6_PARAMPROB_OPTION, off); 1001 return (-1); 1002 } 1003 1004 m_freem(m); /* XXX: NOTREACHED */ 1005 return (-1); 1006 } 1007 1008 /* 1009 * Create the "control" list for this pcb. 1010 * 1011 * The routine will be called from upper layer handlers like tcp6_input(). 1012 * Thus the routine assumes that the caller (tcp6_input) have already 1013 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the 1014 * very first mbuf on the mbuf chain. 1015 * We may want to add some infinite loop prevention or sanity checks for safety. 1016 * (This applies only when you are using KAME mbuf chain restriction, i.e. 1017 * you are using IP6_EXTHDR_CHECK() not m_pulldown()) 1018 */ 1019 void 1020 ip6_savecontrol(struct in6pcb *in6p, struct mbuf **mp, 1021 struct ip6_hdr *ip6, struct mbuf *m) 1022 { 1023 #ifdef RFC2292 1024 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y)) 1025 #else 1026 #define IS2292(x, y) (y) 1027 #endif 1028 1029 if (in6p->in6p_socket->so_options & SO_TIMESTAMP 1030 #ifdef SO_OTIMESTAMP 1031 || in6p->in6p_socket->so_options & SO_OTIMESTAMP 1032 #endif 1033 ) { 1034 struct timeval tv; 1035 1036 microtime(&tv); 1037 #ifdef SO_OTIMESTAMP 1038 if (in6p->in6p_socket->so_options & SO_OTIMESTAMP) { 1039 struct timeval50 tv50; 1040 timeval_to_timeval50(&tv, &tv50); 1041 *mp = sbcreatecontrol((void *) &tv50, sizeof(tv50), 1042 SCM_OTIMESTAMP, SOL_SOCKET); 1043 } else 1044 #endif 1045 *mp = sbcreatecontrol((void *) &tv, sizeof(tv), 1046 SCM_TIMESTAMP, SOL_SOCKET); 1047 if (*mp) 1048 mp = &(*mp)->m_next; 1049 } 1050 1051 /* some OSes call this logic with IPv4 packet, for SO_TIMESTAMP */ 1052 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) 1053 return; 1054 1055 /* RFC 2292 sec. 5 */ 1056 if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) { 1057 struct in6_pktinfo pi6; 1058 1059 memcpy(&pi6.ipi6_addr, &ip6->ip6_dst, sizeof(struct in6_addr)); 1060 in6_clearscope(&pi6.ipi6_addr); /* XXX */ 1061 pi6.ipi6_ifindex = m->m_pkthdr.rcvif ? 1062 m->m_pkthdr.rcvif->if_index : 0; 1063 *mp = sbcreatecontrol((void *) &pi6, 1064 sizeof(struct in6_pktinfo), 1065 IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6); 1066 if (*mp) 1067 mp = &(*mp)->m_next; 1068 } 1069 1070 if (in6p->in6p_flags & IN6P_HOPLIMIT) { 1071 int hlim = ip6->ip6_hlim & 0xff; 1072 1073 *mp = sbcreatecontrol((void *) &hlim, sizeof(int), 1074 IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6); 1075 if (*mp) 1076 mp = &(*mp)->m_next; 1077 } 1078 1079 if ((in6p->in6p_flags & IN6P_TCLASS) != 0) { 1080 u_int32_t flowinfo; 1081 int tclass; 1082 1083 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK); 1084 flowinfo >>= 20; 1085 1086 tclass = flowinfo & 0xff; 1087 *mp = sbcreatecontrol((void *)&tclass, sizeof(tclass), 1088 IPV6_TCLASS, IPPROTO_IPV6); 1089 1090 if (*mp) 1091 mp = &(*mp)->m_next; 1092 } 1093 1094 /* 1095 * IPV6_HOPOPTS socket option. Recall that we required super-user 1096 * privilege for the option (see ip6_ctloutput), but it might be too 1097 * strict, since there might be some hop-by-hop options which can be 1098 * returned to normal user. 1099 * See also RFC3542 section 8 (or RFC2292 section 6). 1100 */ 1101 if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0) { 1102 /* 1103 * Check if a hop-by-hop options header is contatined in the 1104 * received packet, and if so, store the options as ancillary 1105 * data. Note that a hop-by-hop options header must be 1106 * just after the IPv6 header, which fact is assured through 1107 * the IPv6 input processing. 1108 */ 1109 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1110 if (xip6->ip6_nxt == IPPROTO_HOPOPTS) { 1111 struct ip6_hbh *hbh; 1112 int hbhlen; 1113 struct mbuf *ext; 1114 1115 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr), 1116 xip6->ip6_nxt); 1117 if (ext == NULL) { 1118 IP6_STATINC(IP6_STAT_TOOSHORT); 1119 return; 1120 } 1121 hbh = mtod(ext, struct ip6_hbh *); 1122 hbhlen = (hbh->ip6h_len + 1) << 3; 1123 if (hbhlen != ext->m_len) { 1124 m_freem(ext); 1125 IP6_STATINC(IP6_STAT_TOOSHORT); 1126 return; 1127 } 1128 1129 /* 1130 * XXX: We copy whole the header even if a jumbo 1131 * payload option is included, which option is to 1132 * be removed before returning in the RFC 2292. 1133 * Note: this constraint is removed in RFC3542. 1134 */ 1135 *mp = sbcreatecontrol((void *)hbh, hbhlen, 1136 IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS), 1137 IPPROTO_IPV6); 1138 if (*mp) 1139 mp = &(*mp)->m_next; 1140 m_freem(ext); 1141 } 1142 } 1143 1144 /* IPV6_DSTOPTS and IPV6_RTHDR socket options */ 1145 if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) { 1146 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1147 int nxt = xip6->ip6_nxt, off = sizeof(struct ip6_hdr); 1148 1149 /* 1150 * Search for destination options headers or routing 1151 * header(s) through the header chain, and stores each 1152 * header as ancillary data. 1153 * Note that the order of the headers remains in 1154 * the chain of ancillary data. 1155 */ 1156 for (;;) { /* is explicit loop prevention necessary? */ 1157 struct ip6_ext *ip6e = NULL; 1158 int elen; 1159 struct mbuf *ext = NULL; 1160 1161 /* 1162 * if it is not an extension header, don't try to 1163 * pull it from the chain. 1164 */ 1165 switch (nxt) { 1166 case IPPROTO_DSTOPTS: 1167 case IPPROTO_ROUTING: 1168 case IPPROTO_HOPOPTS: 1169 case IPPROTO_AH: /* is it possible? */ 1170 break; 1171 default: 1172 goto loopend; 1173 } 1174 1175 ext = ip6_pullexthdr(m, off, nxt); 1176 if (ext == NULL) { 1177 IP6_STATINC(IP6_STAT_TOOSHORT); 1178 return; 1179 } 1180 ip6e = mtod(ext, struct ip6_ext *); 1181 if (nxt == IPPROTO_AH) 1182 elen = (ip6e->ip6e_len + 2) << 2; 1183 else 1184 elen = (ip6e->ip6e_len + 1) << 3; 1185 if (elen != ext->m_len) { 1186 m_freem(ext); 1187 IP6_STATINC(IP6_STAT_TOOSHORT); 1188 return; 1189 } 1190 KASSERT(IP6_HDR_ALIGNED_P(ip6e)); 1191 1192 switch (nxt) { 1193 case IPPROTO_DSTOPTS: 1194 if (!(in6p->in6p_flags & IN6P_DSTOPTS)) 1195 break; 1196 1197 *mp = sbcreatecontrol((void *)ip6e, elen, 1198 IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS), 1199 IPPROTO_IPV6); 1200 if (*mp) 1201 mp = &(*mp)->m_next; 1202 break; 1203 1204 case IPPROTO_ROUTING: 1205 if (!(in6p->in6p_flags & IN6P_RTHDR)) 1206 break; 1207 1208 *mp = sbcreatecontrol((void *)ip6e, elen, 1209 IS2292(IPV6_2292RTHDR, IPV6_RTHDR), 1210 IPPROTO_IPV6); 1211 if (*mp) 1212 mp = &(*mp)->m_next; 1213 break; 1214 1215 case IPPROTO_HOPOPTS: 1216 case IPPROTO_AH: /* is it possible? */ 1217 break; 1218 1219 default: 1220 /* 1221 * other cases have been filtered in the above. 1222 * none will visit this case. here we supply 1223 * the code just in case (nxt overwritten or 1224 * other cases). 1225 */ 1226 m_freem(ext); 1227 goto loopend; 1228 1229 } 1230 1231 /* proceed with the next header. */ 1232 off += elen; 1233 nxt = ip6e->ip6e_nxt; 1234 ip6e = NULL; 1235 m_freem(ext); 1236 ext = NULL; 1237 } 1238 loopend: 1239 ; 1240 } 1241 } 1242 #undef IS2292 1243 1244 1245 void 1246 ip6_notify_pmtu(struct in6pcb *in6p, const struct sockaddr_in6 *dst, 1247 uint32_t *mtu) 1248 { 1249 struct socket *so; 1250 struct mbuf *m_mtu; 1251 struct ip6_mtuinfo mtuctl; 1252 1253 so = in6p->in6p_socket; 1254 1255 if (mtu == NULL) 1256 return; 1257 1258 #ifdef DIAGNOSTIC 1259 if (so == NULL) /* I believe this is impossible */ 1260 panic("ip6_notify_pmtu: socket is NULL"); 1261 #endif 1262 1263 memset(&mtuctl, 0, sizeof(mtuctl)); /* zero-clear for safety */ 1264 mtuctl.ip6m_mtu = *mtu; 1265 mtuctl.ip6m_addr = *dst; 1266 if (sa6_recoverscope(&mtuctl.ip6m_addr)) 1267 return; 1268 1269 if ((m_mtu = sbcreatecontrol((void *)&mtuctl, sizeof(mtuctl), 1270 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL) 1271 return; 1272 1273 if (sbappendaddr(&so->so_rcv, (const struct sockaddr *)dst, NULL, m_mtu) 1274 == 0) { 1275 m_freem(m_mtu); 1276 /* XXX: should count statistics */ 1277 } else 1278 sorwakeup(so); 1279 1280 return; 1281 } 1282 1283 /* 1284 * pull single extension header from mbuf chain. returns single mbuf that 1285 * contains the result, or NULL on error. 1286 */ 1287 static struct mbuf * 1288 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt) 1289 { 1290 struct ip6_ext ip6e; 1291 size_t elen; 1292 struct mbuf *n; 1293 1294 #ifdef DIAGNOSTIC 1295 switch (nxt) { 1296 case IPPROTO_DSTOPTS: 1297 case IPPROTO_ROUTING: 1298 case IPPROTO_HOPOPTS: 1299 case IPPROTO_AH: /* is it possible? */ 1300 break; 1301 default: 1302 printf("ip6_pullexthdr: invalid nxt=%d\n", nxt); 1303 } 1304 #endif 1305 1306 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1307 if (nxt == IPPROTO_AH) 1308 elen = (ip6e.ip6e_len + 2) << 2; 1309 else 1310 elen = (ip6e.ip6e_len + 1) << 3; 1311 1312 MGET(n, M_DONTWAIT, MT_DATA); 1313 if (n && elen >= MLEN) { 1314 MCLGET(n, M_DONTWAIT); 1315 if ((n->m_flags & M_EXT) == 0) { 1316 m_free(n); 1317 n = NULL; 1318 } 1319 } 1320 if (!n) 1321 return NULL; 1322 1323 n->m_len = 0; 1324 if (elen >= M_TRAILINGSPACE(n)) { 1325 m_free(n); 1326 return NULL; 1327 } 1328 1329 m_copydata(m, off, elen, mtod(n, void *)); 1330 n->m_len = elen; 1331 return n; 1332 } 1333 1334 /* 1335 * Get pointer to the previous header followed by the header 1336 * currently processed. 1337 * XXX: This function supposes that 1338 * M includes all headers, 1339 * the next header field and the header length field of each header 1340 * are valid, and 1341 * the sum of each header length equals to OFF. 1342 * Because of these assumptions, this function must be called very 1343 * carefully. Moreover, it will not be used in the near future when 1344 * we develop `neater' mechanism to process extension headers. 1345 */ 1346 u_int8_t * 1347 ip6_get_prevhdr(struct mbuf *m, int off) 1348 { 1349 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1350 1351 if (off == sizeof(struct ip6_hdr)) 1352 return (&ip6->ip6_nxt); 1353 else { 1354 int len, nxt; 1355 struct ip6_ext *ip6e = NULL; 1356 1357 nxt = ip6->ip6_nxt; 1358 len = sizeof(struct ip6_hdr); 1359 while (len < off) { 1360 ip6e = (struct ip6_ext *)(mtod(m, char *) + len); 1361 1362 switch (nxt) { 1363 case IPPROTO_FRAGMENT: 1364 len += sizeof(struct ip6_frag); 1365 break; 1366 case IPPROTO_AH: 1367 len += (ip6e->ip6e_len + 2) << 2; 1368 break; 1369 default: 1370 len += (ip6e->ip6e_len + 1) << 3; 1371 break; 1372 } 1373 nxt = ip6e->ip6e_nxt; 1374 } 1375 if (ip6e) 1376 return (&ip6e->ip6e_nxt); 1377 else 1378 return NULL; 1379 } 1380 } 1381 1382 /* 1383 * get next header offset. m will be retained. 1384 */ 1385 int 1386 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp) 1387 { 1388 struct ip6_hdr ip6; 1389 struct ip6_ext ip6e; 1390 struct ip6_frag fh; 1391 1392 /* just in case */ 1393 if (m == NULL) 1394 panic("ip6_nexthdr: m == NULL"); 1395 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off) 1396 return -1; 1397 1398 switch (proto) { 1399 case IPPROTO_IPV6: 1400 /* do not chase beyond intermediate IPv6 headers */ 1401 if (off != 0) 1402 return -1; 1403 if (m->m_pkthdr.len < off + sizeof(ip6)) 1404 return -1; 1405 m_copydata(m, off, sizeof(ip6), (void *)&ip6); 1406 if (nxtp) 1407 *nxtp = ip6.ip6_nxt; 1408 off += sizeof(ip6); 1409 return off; 1410 1411 case IPPROTO_FRAGMENT: 1412 /* 1413 * terminate parsing if it is not the first fragment, 1414 * it does not make sense to parse through it. 1415 */ 1416 if (m->m_pkthdr.len < off + sizeof(fh)) 1417 return -1; 1418 m_copydata(m, off, sizeof(fh), (void *)&fh); 1419 if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0) 1420 return -1; 1421 if (nxtp) 1422 *nxtp = fh.ip6f_nxt; 1423 off += sizeof(struct ip6_frag); 1424 return off; 1425 1426 case IPPROTO_AH: 1427 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1428 return -1; 1429 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1430 if (nxtp) 1431 *nxtp = ip6e.ip6e_nxt; 1432 off += (ip6e.ip6e_len + 2) << 2; 1433 if (m->m_pkthdr.len < off) 1434 return -1; 1435 return off; 1436 1437 case IPPROTO_HOPOPTS: 1438 case IPPROTO_ROUTING: 1439 case IPPROTO_DSTOPTS: 1440 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1441 return -1; 1442 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1443 if (nxtp) 1444 *nxtp = ip6e.ip6e_nxt; 1445 off += (ip6e.ip6e_len + 1) << 3; 1446 if (m->m_pkthdr.len < off) 1447 return -1; 1448 return off; 1449 1450 case IPPROTO_NONE: 1451 case IPPROTO_ESP: 1452 case IPPROTO_IPCOMP: 1453 /* give up */ 1454 return -1; 1455 1456 default: 1457 return -1; 1458 } 1459 } 1460 1461 /* 1462 * get offset for the last header in the chain. m will be kept untainted. 1463 */ 1464 int 1465 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp) 1466 { 1467 int newoff; 1468 int nxt; 1469 1470 if (!nxtp) { 1471 nxt = -1; 1472 nxtp = &nxt; 1473 } 1474 for (;;) { 1475 newoff = ip6_nexthdr(m, off, proto, nxtp); 1476 if (newoff < 0) 1477 return off; 1478 else if (newoff < off) 1479 return -1; /* invalid */ 1480 else if (newoff == off) 1481 return newoff; 1482 1483 off = newoff; 1484 proto = *nxtp; 1485 } 1486 } 1487 1488 struct m_tag * 1489 ip6_addaux(struct mbuf *m) 1490 { 1491 struct m_tag *mtag; 1492 1493 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1494 if (!mtag) { 1495 mtag = m_tag_get(PACKET_TAG_INET6, sizeof(struct ip6aux), 1496 M_NOWAIT); 1497 if (mtag) { 1498 m_tag_prepend(m, mtag); 1499 memset(mtag + 1, 0, sizeof(struct ip6aux)); 1500 } 1501 } 1502 return mtag; 1503 } 1504 1505 struct m_tag * 1506 ip6_findaux(struct mbuf *m) 1507 { 1508 struct m_tag *mtag; 1509 1510 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1511 return mtag; 1512 } 1513 1514 void 1515 ip6_delaux(struct mbuf *m) 1516 { 1517 struct m_tag *mtag; 1518 1519 mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); 1520 if (mtag) 1521 m_tag_delete(m, mtag); 1522 } 1523 1524 #ifdef GATEWAY 1525 /* 1526 * sysctl helper routine for net.inet.ip6.maxflows. Since 1527 * we could reduce this value, call ip6flow_reap(); 1528 */ 1529 static int 1530 sysctl_net_inet6_ip6_maxflows(SYSCTLFN_ARGS) 1531 { 1532 int error; 1533 1534 error = sysctl_lookup(SYSCTLFN_CALL(rnode)); 1535 if (error || newp == NULL) 1536 return (error); 1537 1538 mutex_enter(softnet_lock); 1539 KERNEL_LOCK(1, NULL); 1540 1541 ip6flow_reap(0); 1542 1543 KERNEL_UNLOCK_ONE(NULL); 1544 mutex_exit(softnet_lock); 1545 1546 return (0); 1547 } 1548 1549 static int 1550 sysctl_net_inet6_ip6_hashsize(SYSCTLFN_ARGS) 1551 { 1552 int error, tmp; 1553 struct sysctlnode node; 1554 1555 node = *rnode; 1556 tmp = ip6_hashsize; 1557 node.sysctl_data = &tmp; 1558 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 1559 if (error || newp == NULL) 1560 return (error); 1561 1562 if ((tmp & (tmp - 1)) == 0 && tmp != 0) { 1563 /* 1564 * Can only fail due to malloc() 1565 */ 1566 mutex_enter(softnet_lock); 1567 KERNEL_LOCK(1, NULL); 1568 1569 error = ip6flow_invalidate_all(tmp); 1570 1571 KERNEL_UNLOCK_ONE(NULL); 1572 mutex_exit(softnet_lock); 1573 } else { 1574 /* 1575 * EINVAL if not a power of 2 1576 */ 1577 error = EINVAL; 1578 } 1579 1580 return error; 1581 } 1582 #endif /* GATEWAY */ 1583 1584 /* 1585 * System control for IP6 1586 */ 1587 1588 const u_char inet6ctlerrmap[PRC_NCMDS] = { 1589 0, 0, 0, 0, 1590 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 1591 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 1592 EMSGSIZE, EHOSTUNREACH, 0, 0, 1593 0, 0, 0, 0, 1594 ENOPROTOOPT 1595 }; 1596 1597 extern int sysctl_net_inet6_addrctlpolicy(SYSCTLFN_ARGS); 1598 1599 static int 1600 sysctl_net_inet6_ip6_stats(SYSCTLFN_ARGS) 1601 { 1602 1603 return (NETSTAT_SYSCTL(ip6stat_percpu, IP6_NSTATS)); 1604 } 1605 1606 static void 1607 sysctl_net_inet6_ip6_setup(struct sysctllog **clog) 1608 { 1609 #ifdef RFC2292 1610 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y)) 1611 #else 1612 #define IS2292(x, y) (y) 1613 #endif 1614 1615 sysctl_createv(clog, 0, NULL, NULL, 1616 CTLFLAG_PERMANENT, 1617 CTLTYPE_NODE, "inet6", 1618 SYSCTL_DESCR("PF_INET6 related settings"), 1619 NULL, 0, NULL, 0, 1620 CTL_NET, PF_INET6, CTL_EOL); 1621 sysctl_createv(clog, 0, NULL, NULL, 1622 CTLFLAG_PERMANENT, 1623 CTLTYPE_NODE, "ip6", 1624 SYSCTL_DESCR("IPv6 related settings"), 1625 NULL, 0, NULL, 0, 1626 CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_EOL); 1627 1628 sysctl_createv(clog, 0, NULL, NULL, 1629 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1630 CTLTYPE_INT, "forwarding", 1631 SYSCTL_DESCR("Enable forwarding of INET6 datagrams"), 1632 NULL, 0, &ip6_forwarding, 0, 1633 CTL_NET, PF_INET6, IPPROTO_IPV6, 1634 IPV6CTL_FORWARDING, CTL_EOL); 1635 sysctl_createv(clog, 0, NULL, NULL, 1636 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1637 CTLTYPE_INT, "redirect", 1638 SYSCTL_DESCR("Enable sending of ICMPv6 redirect messages"), 1639 NULL, 0, &ip6_sendredirects, 0, 1640 CTL_NET, PF_INET6, IPPROTO_IPV6, 1641 IPV6CTL_SENDREDIRECTS, CTL_EOL); 1642 sysctl_createv(clog, 0, NULL, NULL, 1643 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1644 CTLTYPE_INT, "hlim", 1645 SYSCTL_DESCR("Hop limit for an INET6 datagram"), 1646 NULL, 0, &ip6_defhlim, 0, 1647 CTL_NET, PF_INET6, IPPROTO_IPV6, 1648 IPV6CTL_DEFHLIM, CTL_EOL); 1649 #ifdef notyet 1650 sysctl_createv(clog, 0, NULL, NULL, 1651 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1652 CTLTYPE_INT, "mtu", NULL, 1653 NULL, 0, &, 0, 1654 CTL_NET, PF_INET6, IPPROTO_IPV6, 1655 IPV6CTL_DEFMTU, CTL_EOL); 1656 #endif 1657 #ifdef __no_idea__ 1658 sysctl_createv(clog, 0, NULL, NULL, 1659 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1660 CTLTYPE_INT, "forwsrcrt", NULL, 1661 NULL, 0, &?, 0, 1662 CTL_NET, PF_INET6, IPPROTO_IPV6, 1663 IPV6CTL_FORWSRCRT, CTL_EOL); 1664 sysctl_createv(clog, 0, NULL, NULL, 1665 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1666 CTLTYPE_STRUCT, "mrtstats", NULL, 1667 NULL, 0, &?, sizeof(?), 1668 CTL_NET, PF_INET6, IPPROTO_IPV6, 1669 IPV6CTL_MRTSTATS, CTL_EOL); 1670 sysctl_createv(clog, 0, NULL, NULL, 1671 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1672 CTLTYPE_?, "mrtproto", NULL, 1673 NULL, 0, &?, sizeof(?), 1674 CTL_NET, PF_INET6, IPPROTO_IPV6, 1675 IPV6CTL_MRTPROTO, CTL_EOL); 1676 #endif 1677 sysctl_createv(clog, 0, NULL, NULL, 1678 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1679 CTLTYPE_INT, "maxfragpackets", 1680 SYSCTL_DESCR("Maximum number of fragments to buffer " 1681 "for reassembly"), 1682 NULL, 0, &ip6_maxfragpackets, 0, 1683 CTL_NET, PF_INET6, IPPROTO_IPV6, 1684 IPV6CTL_MAXFRAGPACKETS, CTL_EOL); 1685 #ifdef __no_idea__ 1686 sysctl_createv(clog, 0, NULL, NULL, 1687 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1688 CTLTYPE_INT, "sourcecheck", NULL, 1689 NULL, 0, &?, 0, 1690 CTL_NET, PF_INET6, IPPROTO_IPV6, 1691 IPV6CTL_SOURCECHECK, CTL_EOL); 1692 sysctl_createv(clog, 0, NULL, NULL, 1693 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1694 CTLTYPE_INT, "sourcecheck_logint", NULL, 1695 NULL, 0, &?, 0, 1696 CTL_NET, PF_INET6, IPPROTO_IPV6, 1697 IPV6CTL_SOURCECHECK_LOGINT, CTL_EOL); 1698 #endif 1699 sysctl_createv(clog, 0, NULL, NULL, 1700 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1701 CTLTYPE_INT, "accept_rtadv", 1702 SYSCTL_DESCR("Accept router advertisements"), 1703 NULL, 0, &ip6_accept_rtadv, 0, 1704 CTL_NET, PF_INET6, IPPROTO_IPV6, 1705 IPV6CTL_ACCEPT_RTADV, CTL_EOL); 1706 sysctl_createv(clog, 0, NULL, NULL, 1707 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1708 CTLTYPE_INT, "rtadv_maxroutes", 1709 SYSCTL_DESCR("Maximum number of routes accepted via router advertisements"), 1710 NULL, 0, &ip6_rtadv_maxroutes, 0, 1711 CTL_NET, PF_INET6, IPPROTO_IPV6, 1712 IPV6CTL_RTADV_MAXROUTES, CTL_EOL); 1713 sysctl_createv(clog, 0, NULL, NULL, 1714 CTLFLAG_PERMANENT, 1715 CTLTYPE_INT, "rtadv_numroutes", 1716 SYSCTL_DESCR("Current number of routes accepted via router advertisements"), 1717 NULL, 0, &nd6_numroutes, 0, 1718 CTL_NET, PF_INET6, IPPROTO_IPV6, 1719 IPV6CTL_RTADV_NUMROUTES, CTL_EOL); 1720 sysctl_createv(clog, 0, NULL, NULL, 1721 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1722 CTLTYPE_INT, "keepfaith", 1723 SYSCTL_DESCR("Activate faith interface"), 1724 NULL, 0, &ip6_keepfaith, 0, 1725 CTL_NET, PF_INET6, IPPROTO_IPV6, 1726 IPV6CTL_KEEPFAITH, CTL_EOL); 1727 sysctl_createv(clog, 0, NULL, NULL, 1728 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1729 CTLTYPE_INT, "log_interval", 1730 SYSCTL_DESCR("Minumum interval between logging " 1731 "unroutable packets"), 1732 NULL, 0, &ip6_log_interval, 0, 1733 CTL_NET, PF_INET6, IPPROTO_IPV6, 1734 IPV6CTL_LOG_INTERVAL, CTL_EOL); 1735 sysctl_createv(clog, 0, NULL, NULL, 1736 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1737 CTLTYPE_INT, "hdrnestlimit", 1738 SYSCTL_DESCR("Maximum number of nested IPv6 headers"), 1739 NULL, 0, &ip6_hdrnestlimit, 0, 1740 CTL_NET, PF_INET6, IPPROTO_IPV6, 1741 IPV6CTL_HDRNESTLIMIT, CTL_EOL); 1742 sysctl_createv(clog, 0, NULL, NULL, 1743 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1744 CTLTYPE_INT, "dad_count", 1745 SYSCTL_DESCR("Number of Duplicate Address Detection " 1746 "probes to send"), 1747 NULL, 0, &ip6_dad_count, 0, 1748 CTL_NET, PF_INET6, IPPROTO_IPV6, 1749 IPV6CTL_DAD_COUNT, CTL_EOL); 1750 sysctl_createv(clog, 0, NULL, NULL, 1751 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1752 CTLTYPE_INT, "auto_flowlabel", 1753 SYSCTL_DESCR("Assign random IPv6 flow labels"), 1754 NULL, 0, &ip6_auto_flowlabel, 0, 1755 CTL_NET, PF_INET6, IPPROTO_IPV6, 1756 IPV6CTL_AUTO_FLOWLABEL, CTL_EOL); 1757 sysctl_createv(clog, 0, NULL, NULL, 1758 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1759 CTLTYPE_INT, "defmcasthlim", 1760 SYSCTL_DESCR("Default multicast hop limit"), 1761 NULL, 0, &ip6_defmcasthlim, 0, 1762 CTL_NET, PF_INET6, IPPROTO_IPV6, 1763 IPV6CTL_DEFMCASTHLIM, CTL_EOL); 1764 sysctl_createv(clog, 0, NULL, NULL, 1765 CTLFLAG_PERMANENT, 1766 CTLTYPE_STRING, "kame_version", 1767 SYSCTL_DESCR("KAME Version"), 1768 NULL, 0, __UNCONST(__KAME_VERSION), 0, 1769 CTL_NET, PF_INET6, IPPROTO_IPV6, 1770 IPV6CTL_KAME_VERSION, CTL_EOL); 1771 sysctl_createv(clog, 0, NULL, NULL, 1772 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1773 CTLTYPE_INT, "use_deprecated", 1774 SYSCTL_DESCR("Allow use of deprecated addresses as " 1775 "source addresses"), 1776 NULL, 0, &ip6_use_deprecated, 0, 1777 CTL_NET, PF_INET6, IPPROTO_IPV6, 1778 IPV6CTL_USE_DEPRECATED, CTL_EOL); 1779 sysctl_createv(clog, 0, NULL, NULL, 1780 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1781 CTLTYPE_INT, "rr_prune", NULL, 1782 NULL, 0, &ip6_rr_prune, 0, 1783 CTL_NET, PF_INET6, IPPROTO_IPV6, 1784 IPV6CTL_RR_PRUNE, CTL_EOL); 1785 sysctl_createv(clog, 0, NULL, NULL, 1786 CTLFLAG_PERMANENT 1787 #ifndef INET6_BINDV6ONLY 1788 |CTLFLAG_READWRITE, 1789 #endif 1790 CTLTYPE_INT, "v6only", 1791 SYSCTL_DESCR("Disallow PF_INET6 sockets from connecting " 1792 "to PF_INET sockets"), 1793 NULL, 0, &ip6_v6only, 0, 1794 CTL_NET, PF_INET6, IPPROTO_IPV6, 1795 IPV6CTL_V6ONLY, CTL_EOL); 1796 sysctl_createv(clog, 0, NULL, NULL, 1797 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1798 CTLTYPE_INT, "anonportmin", 1799 SYSCTL_DESCR("Lowest ephemeral port number to assign"), 1800 sysctl_net_inet_ip_ports, 0, &ip6_anonportmin, 0, 1801 CTL_NET, PF_INET6, IPPROTO_IPV6, 1802 IPV6CTL_ANONPORTMIN, CTL_EOL); 1803 sysctl_createv(clog, 0, NULL, NULL, 1804 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1805 CTLTYPE_INT, "anonportmax", 1806 SYSCTL_DESCR("Highest ephemeral port number to assign"), 1807 sysctl_net_inet_ip_ports, 0, &ip6_anonportmax, 0, 1808 CTL_NET, PF_INET6, IPPROTO_IPV6, 1809 IPV6CTL_ANONPORTMAX, CTL_EOL); 1810 #ifndef IPNOPRIVPORTS 1811 sysctl_createv(clog, 0, NULL, NULL, 1812 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1813 CTLTYPE_INT, "lowportmin", 1814 SYSCTL_DESCR("Lowest privileged ephemeral port number " 1815 "to assign"), 1816 sysctl_net_inet_ip_ports, 0, &ip6_lowportmin, 0, 1817 CTL_NET, PF_INET6, IPPROTO_IPV6, 1818 IPV6CTL_LOWPORTMIN, CTL_EOL); 1819 sysctl_createv(clog, 0, NULL, NULL, 1820 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1821 CTLTYPE_INT, "lowportmax", 1822 SYSCTL_DESCR("Highest privileged ephemeral port number " 1823 "to assign"), 1824 sysctl_net_inet_ip_ports, 0, &ip6_lowportmax, 0, 1825 CTL_NET, PF_INET6, IPPROTO_IPV6, 1826 IPV6CTL_LOWPORTMAX, CTL_EOL); 1827 #endif /* IPNOPRIVPORTS */ 1828 sysctl_createv(clog, 0, NULL, NULL, 1829 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1830 CTLTYPE_INT, "auto_linklocal", 1831 SYSCTL_DESCR("Default value of per-interface flag for " 1832 "adding an IPv6 link-local address to " 1833 "interfaces when attached"), 1834 NULL, 0, &ip6_auto_linklocal, 0, 1835 CTL_NET, PF_INET6, IPPROTO_IPV6, 1836 IPV6CTL_AUTO_LINKLOCAL, CTL_EOL); 1837 sysctl_createv(clog, 0, NULL, NULL, 1838 CTLFLAG_PERMANENT|CTLFLAG_READONLY, 1839 CTLTYPE_STRUCT, "addctlpolicy", 1840 SYSCTL_DESCR("Return the current address control" 1841 " policy"), 1842 sysctl_net_inet6_addrctlpolicy, 0, NULL, 0, 1843 CTL_NET, PF_INET6, IPPROTO_IPV6, 1844 IPV6CTL_ADDRCTLPOLICY, CTL_EOL); 1845 sysctl_createv(clog, 0, NULL, NULL, 1846 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1847 CTLTYPE_INT, "use_tempaddr", 1848 SYSCTL_DESCR("Use temporary address"), 1849 NULL, 0, &ip6_use_tempaddr, 0, 1850 CTL_NET, PF_INET6, IPPROTO_IPV6, 1851 CTL_CREATE, CTL_EOL); 1852 sysctl_createv(clog, 0, NULL, NULL, 1853 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1854 CTLTYPE_INT, "prefer_tempaddr", 1855 SYSCTL_DESCR("Prefer temporary address as source " 1856 "address"), 1857 NULL, 0, &ip6_prefer_tempaddr, 0, 1858 CTL_NET, PF_INET6, IPPROTO_IPV6, 1859 CTL_CREATE, CTL_EOL); 1860 sysctl_createv(clog, 0, NULL, NULL, 1861 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1862 CTLTYPE_INT, "temppltime", 1863 SYSCTL_DESCR("preferred lifetime of a temporary address"), 1864 NULL, 0, &ip6_temp_preferred_lifetime, 0, 1865 CTL_NET, PF_INET6, IPPROTO_IPV6, 1866 CTL_CREATE, CTL_EOL); 1867 sysctl_createv(clog, 0, NULL, NULL, 1868 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1869 CTLTYPE_INT, "tempvltime", 1870 SYSCTL_DESCR("valid lifetime of a temporary address"), 1871 NULL, 0, &ip6_temp_valid_lifetime, 0, 1872 CTL_NET, PF_INET6, IPPROTO_IPV6, 1873 CTL_CREATE, CTL_EOL); 1874 sysctl_createv(clog, 0, NULL, NULL, 1875 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1876 CTLTYPE_INT, "maxfrags", 1877 SYSCTL_DESCR("Maximum fragments in reassembly queue"), 1878 NULL, 0, &ip6_maxfrags, 0, 1879 CTL_NET, PF_INET6, IPPROTO_IPV6, 1880 IPV6CTL_MAXFRAGS, CTL_EOL); 1881 sysctl_createv(clog, 0, NULL, NULL, 1882 CTLFLAG_PERMANENT, 1883 CTLTYPE_STRUCT, "stats", 1884 SYSCTL_DESCR("IPv6 statistics"), 1885 sysctl_net_inet6_ip6_stats, 0, NULL, 0, 1886 CTL_NET, PF_INET6, IPPROTO_IPV6, 1887 IPV6CTL_STATS, CTL_EOL); 1888 sysctl_createv(clog, 0, NULL, NULL, 1889 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1890 CTLTYPE_INT, "use_defaultzone", 1891 SYSCTL_DESCR("Whether to use the default scope zones"), 1892 NULL, 0, &ip6_use_defzone, 0, 1893 CTL_NET, PF_INET6, IPPROTO_IPV6, 1894 IPV6CTL_USE_DEFAULTZONE, CTL_EOL); 1895 sysctl_createv(clog, 0, NULL, NULL, 1896 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1897 CTLTYPE_INT, "mcast_pmtu", 1898 SYSCTL_DESCR("Enable pMTU discovery for multicast packet"), 1899 NULL, 0, &ip6_mcast_pmtu, 0, 1900 CTL_NET, PF_INET6, IPPROTO_IPV6, 1901 CTL_CREATE, CTL_EOL); 1902 #ifdef GATEWAY 1903 sysctl_createv(clog, 0, NULL, NULL, 1904 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1905 CTLTYPE_INT, "maxflows", 1906 SYSCTL_DESCR("Number of flows for fast forwarding (IPv6)"), 1907 sysctl_net_inet6_ip6_maxflows, 0, &ip6_maxflows, 0, 1908 CTL_NET, PF_INET6, IPPROTO_IPV6, 1909 CTL_CREATE, CTL_EOL); 1910 sysctl_createv(clog, 0, NULL, NULL, 1911 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1912 CTLTYPE_INT, "hashsize", 1913 SYSCTL_DESCR("Size of hash table for fast forwarding (IPv6)"), 1914 sysctl_net_inet6_ip6_hashsize, 0, &ip6_hashsize, 0, 1915 CTL_NET, PF_INET6, IPPROTO_IPV6, 1916 CTL_CREATE, CTL_EOL); 1917 #endif 1918 /* anonportalgo RFC6056 subtree */ 1919 const struct sysctlnode *portalgo_node; 1920 sysctl_createv(clog, 0, NULL, &portalgo_node, 1921 CTLFLAG_PERMANENT, 1922 CTLTYPE_NODE, "anonportalgo", 1923 SYSCTL_DESCR("Anonymous port algorithm selection (RFC 6056)"), 1924 NULL, 0, NULL, 0, 1925 CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_CREATE, CTL_EOL); 1926 sysctl_createv(clog, 0, &portalgo_node, NULL, 1927 CTLFLAG_PERMANENT, 1928 CTLTYPE_STRING, "available", 1929 SYSCTL_DESCR("available algorithms"), 1930 sysctl_portalgo_available, 0, NULL, PORTALGO_MAXLEN, 1931 CTL_CREATE, CTL_EOL); 1932 sysctl_createv(clog, 0, &portalgo_node, NULL, 1933 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1934 CTLTYPE_STRING, "selected", 1935 SYSCTL_DESCR("selected algorithm"), 1936 sysctl_portalgo_selected6, 0, NULL, PORTALGO_MAXLEN, 1937 CTL_CREATE, CTL_EOL); 1938 sysctl_createv(clog, 0, &portalgo_node, NULL, 1939 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1940 CTLTYPE_STRUCT, "reserve", 1941 SYSCTL_DESCR("bitmap of reserved ports"), 1942 sysctl_portalgo_reserve6, 0, NULL, 0, 1943 CTL_CREATE, CTL_EOL); 1944 sysctl_createv(clog, 0, NULL, NULL, 1945 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1946 CTLTYPE_INT, "neighborgcthresh", 1947 SYSCTL_DESCR("Maximum number of entries in neighbor" 1948 " cache"), 1949 NULL, 1, &ip6_neighborgcthresh, 0, 1950 CTL_NET, PF_INET6, IPPROTO_IPV6, 1951 CTL_CREATE, CTL_EOL); 1952 sysctl_createv(clog, 0, NULL, NULL, 1953 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1954 CTLTYPE_INT, "maxifprefixes", 1955 SYSCTL_DESCR("Maximum number of prefixes created by" 1956 " route advertisement per interface"), 1957 NULL, 1, &ip6_maxifprefixes, 0, 1958 CTL_NET, PF_INET6, IPPROTO_IPV6, 1959 CTL_CREATE, CTL_EOL); 1960 sysctl_createv(clog, 0, NULL, NULL, 1961 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1962 CTLTYPE_INT, "maxifdefrouters", 1963 SYSCTL_DESCR("Maximum number of default routers created" 1964 " by route advertisement per interface"), 1965 NULL, 1, &ip6_maxifdefrouters, 0, 1966 CTL_NET, PF_INET6, IPPROTO_IPV6, 1967 CTL_CREATE, CTL_EOL); 1968 sysctl_createv(clog, 0, NULL, NULL, 1969 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1970 CTLTYPE_INT, "maxdynroutes", 1971 SYSCTL_DESCR("Maximum number of routes created via" 1972 " redirect"), 1973 NULL, 1, &ip6_maxdynroutes, 0, 1974 CTL_NET, PF_INET6, IPPROTO_IPV6, 1975 CTL_CREATE, CTL_EOL); 1976 } 1977 1978 void 1979 ip6_statinc(u_int stat) 1980 { 1981 1982 KASSERT(stat < IP6_NSTATS); 1983 IP6_STATINC(stat); 1984 } 1985
Indexes created Mon Sep 22 10:09:38 GMT 2025