ip6_input.c revision 1.220
1 /* $NetBSD: ip6_input.c,v 1.220 2020/08/28 06:20:44 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 1.220 2020/08/28 06:20:44 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_net_mpsafe.h" 73 #endif 74 75 #include <sys/param.h> 76 #include <sys/systm.h> 77 #include <sys/mbuf.h> 78 #include <sys/domain.h> 79 #include <sys/protosw.h> 80 #include <sys/socket.h> 81 #include <sys/socketvar.h> 82 #include <sys/errno.h> 83 #include <sys/time.h> 84 #include <sys/kernel.h> 85 #include <sys/syslog.h> 86 #include <sys/proc.h> 87 #include <sys/sysctl.h> 88 #include <sys/cprng.h> 89 #include <sys/percpu.h> 90 91 #include <net/if.h> 92 #include <net/if_types.h> 93 #include <net/if_dl.h> 94 #include <net/route.h> 95 #include <net/pktqueue.h> 96 #include <net/pfil.h> 97 98 #include <netinet/in.h> 99 #include <netinet/in_systm.h> 100 #ifdef INET 101 #include <netinet/ip.h> 102 #include <netinet/ip_var.h> 103 #include <netinet/ip_icmp.h> 104 #endif /* INET */ 105 #include <netinet/ip6.h> 106 #include <netinet/portalgo.h> 107 #include <netinet6/in6_var.h> 108 #include <netinet6/ip6_var.h> 109 #include <netinet6/ip6_private.h> 110 #include <netinet6/in6_pcb.h> 111 #include <netinet/icmp6.h> 112 #include <netinet6/scope6_var.h> 113 #include <netinet6/in6_ifattach.h> 114 #include <netinet6/nd6.h> 115 116 #ifdef IPSEC 117 #include <netipsec/ipsec.h> 118 #include <netipsec/ipsec6.h> 119 #include <netipsec/key.h> 120 #endif /* IPSEC */ 121 122 #include <netinet6/ip6protosw.h> 123 124 #include "faith.h" 125 126 extern struct domain inet6domain; 127 128 u_char ip6_protox[IPPROTO_MAX]; 129 pktqueue_t *ip6_pktq __read_mostly; 130 131 pfil_head_t *inet6_pfil_hook; 132 133 percpu_t *ip6stat_percpu; 134 135 percpu_t *ip6_forward_rt_percpu __cacheline_aligned; 136 137 static void ip6intr(void *); 138 static void ip6_input(struct mbuf *, struct ifnet *); 139 static bool ip6_badaddr(struct ip6_hdr *); 140 static struct m_tag *ip6_setdstifaddr(struct mbuf *, const struct in6_ifaddr *); 141 142 static struct m_tag *ip6_addaux(struct mbuf *); 143 static struct m_tag *ip6_findaux(struct mbuf *); 144 static void ip6_delaux(struct mbuf *); 145 146 static int ip6_process_hopopts(struct mbuf *, u_int8_t *, int, u_int32_t *, 147 u_int32_t *); 148 static struct mbuf *ip6_pullexthdr(struct mbuf *, size_t, int); 149 static void sysctl_net_inet6_ip6_setup(struct sysctllog **); 150 151 #ifdef NET_MPSAFE 152 #define SOFTNET_LOCK() mutex_enter(softnet_lock) 153 #define SOFTNET_UNLOCK() mutex_exit(softnet_lock) 154 #else 155 #define SOFTNET_LOCK() KASSERT(mutex_owned(softnet_lock)) 156 #define SOFTNET_UNLOCK() KASSERT(mutex_owned(softnet_lock)) 157 #endif 158 159 /* Ensure that non packed structures are the desired size. */ 160 __CTASSERT(sizeof(struct ip6_hdr) == 40); 161 __CTASSERT(sizeof(struct ip6_ext) == 2); 162 __CTASSERT(sizeof(struct ip6_hbh) == 2); 163 __CTASSERT(sizeof(struct ip6_dest) == 2); 164 __CTASSERT(sizeof(struct ip6_opt) == 2); 165 __CTASSERT(sizeof(struct ip6_opt_jumbo) == 6); 166 __CTASSERT(sizeof(struct ip6_opt_nsap) == 4); 167 __CTASSERT(sizeof(struct ip6_opt_tunnel) == 3); 168 __CTASSERT(sizeof(struct ip6_opt_router) == 4); 169 __CTASSERT(sizeof(struct ip6_rthdr) == 4); 170 __CTASSERT(sizeof(struct ip6_rthdr0) == 8); 171 __CTASSERT(sizeof(struct ip6_frag) == 8); 172 173 /* 174 * IP6 initialization: fill in IP6 protocol switch table. 175 * All protocols not implemented in kernel go to raw IP6 protocol handler. 176 */ 177 void 178 ip6_init(void) 179 { 180 const struct ip6protosw *pr; 181 int i; 182 183 in6_init(); 184 185 sysctl_net_inet6_ip6_setup(NULL); 186 pr = (const struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 187 if (pr == 0) 188 panic("ip6_init"); 189 for (i = 0; i < IPPROTO_MAX; i++) 190 ip6_protox[i] = pr - inet6sw; 191 for (pr = (const struct ip6protosw *)inet6domain.dom_protosw; 192 pr < (const struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++) 193 if (pr->pr_domain->dom_family == PF_INET6 && 194 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) 195 ip6_protox[pr->pr_protocol] = pr - inet6sw; 196 197 ip6_pktq = pktq_create(IFQ_MAXLEN, ip6intr, NULL); 198 KASSERT(ip6_pktq != NULL); 199 200 scope6_init(); 201 addrsel_policy_init(); 202 nd6_init(); 203 frag6_init(); 204 205 #ifdef GATEWAY 206 ip6flow_init(ip6_hashsize); 207 #endif 208 /* Register our Packet Filter hook. */ 209 inet6_pfil_hook = pfil_head_create(PFIL_TYPE_AF, (void *)AF_INET6); 210 KASSERT(inet6_pfil_hook != NULL); 211 212 ip6stat_percpu = percpu_alloc(sizeof(uint64_t) * IP6_NSTATS); 213 ip6_forward_rt_percpu = rtcache_percpu_alloc(); 214 } 215 216 /* 217 * IP6 input interrupt handling. Just pass the packet to ip6_input. 218 */ 219 static void 220 ip6intr(void *arg __unused) 221 { 222 struct mbuf *m; 223 224 SOFTNET_KERNEL_LOCK_UNLESS_NET_MPSAFE(); 225 while ((m = pktq_dequeue(ip6_pktq)) != NULL) { 226 struct psref psref; 227 struct ifnet *rcvif = m_get_rcvif_psref(m, &psref); 228 229 if (rcvif == NULL) { 230 m_freem(m); 231 continue; 232 } 233 /* 234 * Drop the packet if IPv6 is disabled on the interface. 235 */ 236 if ((ND_IFINFO(rcvif)->flags & ND6_IFF_IFDISABLED)) { 237 m_put_rcvif_psref(rcvif, &psref); 238 m_freem(m); 239 continue; 240 } 241 ip6_input(m, rcvif); 242 m_put_rcvif_psref(rcvif, &psref); 243 } 244 SOFTNET_KERNEL_UNLOCK_UNLESS_NET_MPSAFE(); 245 } 246 247 static void 248 ip6_input(struct mbuf *m, struct ifnet *rcvif) 249 { 250 struct ip6_hdr *ip6; 251 int hit, off = sizeof(struct ip6_hdr), nest; 252 u_int32_t plen; 253 u_int32_t rtalert = ~0; 254 int nxt, ours = 0, rh_present = 0, frg_present; 255 struct ifnet *deliverifp = NULL; 256 int srcrt = 0; 257 struct rtentry *rt = NULL; 258 union { 259 struct sockaddr dst; 260 struct sockaddr_in6 dst6; 261 } u; 262 struct route *ro; 263 264 KASSERT(rcvif != NULL); 265 266 /* 267 * make sure we don't have onion peering information into m_tag. 268 */ 269 ip6_delaux(m); 270 271 /* 272 * mbuf statistics 273 */ 274 if (m->m_flags & M_EXT) { 275 if (m->m_next) 276 IP6_STATINC(IP6_STAT_MEXT2M); 277 else 278 IP6_STATINC(IP6_STAT_MEXT1); 279 } else { 280 #define M2MMAX 32 281 if (m->m_next) { 282 if (m->m_flags & M_LOOP) 283 /*XXX*/ IP6_STATINC(IP6_STAT_M2M + lo0ifp->if_index); 284 else if (rcvif->if_index < M2MMAX) 285 IP6_STATINC(IP6_STAT_M2M + rcvif->if_index); 286 else 287 IP6_STATINC(IP6_STAT_M2M); 288 } else 289 IP6_STATINC(IP6_STAT_M1); 290 #undef M2MMAX 291 } 292 293 in6_ifstat_inc(rcvif, ifs6_in_receive); 294 IP6_STATINC(IP6_STAT_TOTAL); 295 296 /* 297 * If the IPv6 header is not aligned, slurp it up into a new 298 * mbuf with space for link headers, in the event we forward 299 * it. Otherwise, if it is aligned, make sure the entire base 300 * IPv6 header is in the first mbuf of the chain. 301 */ 302 if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) { 303 if ((m = m_copyup(m, sizeof(struct ip6_hdr), 304 (max_linkhdr + 3) & ~3)) == NULL) { 305 /* XXXJRT new stat, please */ 306 IP6_STATINC(IP6_STAT_TOOSMALL); 307 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 308 return; 309 } 310 } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { 311 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 312 IP6_STATINC(IP6_STAT_TOOSMALL); 313 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 314 return; 315 } 316 } 317 318 ip6 = mtod(m, struct ip6_hdr *); 319 320 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 321 IP6_STATINC(IP6_STAT_BADVERS); 322 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 323 goto bad; 324 } 325 326 if (ip6_badaddr(ip6)) { 327 IP6_STATINC(IP6_STAT_BADSCOPE); 328 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 329 goto bad; 330 } 331 332 /* 333 * Assume that we can create a fast-forward IP flow entry 334 * based on this packet. 335 */ 336 m->m_flags |= M_CANFASTFWD; 337 338 /* 339 * Run through list of hooks for input packets. If there are any 340 * filters which require that additional packets in the flow are 341 * not fast-forwarded, they must clear the M_CANFASTFWD flag. 342 * Note that filters must _never_ set this flag, as another filter 343 * in the list may have previously cleared it. 344 * 345 * Don't call hooks if the packet has already been processed by 346 * IPsec (encapsulated, tunnel mode). 347 */ 348 #if defined(IPSEC) 349 if (!ipsec_used || !ipsec_skip_pfil(m)) 350 #else 351 if (1) 352 #endif 353 { 354 struct in6_addr odst; 355 int error; 356 357 odst = ip6->ip6_dst; 358 error = pfil_run_hooks(inet6_pfil_hook, &m, rcvif, PFIL_IN); 359 if (error != 0 || m == NULL) { 360 IP6_STATINC(IP6_STAT_PFILDROP_IN); 361 return; 362 } 363 if (m->m_len < sizeof(struct ip6_hdr)) { 364 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 365 IP6_STATINC(IP6_STAT_TOOSMALL); 366 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 367 return; 368 } 369 } 370 ip6 = mtod(m, struct ip6_hdr *); 371 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst); 372 } 373 374 IP6_STATINC(IP6_STAT_NXTHIST + ip6->ip6_nxt); 375 376 #ifdef ALTQ 377 if (altq_input != NULL) { 378 SOFTNET_LOCK(); 379 if ((*altq_input)(m, AF_INET6) == 0) { 380 SOFTNET_UNLOCK(); 381 /* packet is dropped by traffic conditioner */ 382 return; 383 } 384 SOFTNET_UNLOCK(); 385 } 386 #endif 387 388 /* 389 * Disambiguate address scope zones (if there is ambiguity). 390 * We first make sure that the original source or destination address 391 * is not in our internal form for scoped addresses. Such addresses 392 * are not necessarily invalid spec-wise, but we cannot accept them due 393 * to the usage conflict. 394 * in6_setscope() then also checks and rejects the cases where src or 395 * dst are the loopback address and the receiving interface 396 * is not loopback. 397 */ 398 if (__predict_false( 399 m_makewritable(&m, 0, sizeof(struct ip6_hdr), M_DONTWAIT))) 400 goto bad; 401 ip6 = mtod(m, struct ip6_hdr *); 402 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) { 403 IP6_STATINC(IP6_STAT_BADSCOPE); /* XXX */ 404 goto bad; 405 } 406 if (in6_setscope(&ip6->ip6_src, rcvif, NULL) || 407 in6_setscope(&ip6->ip6_dst, rcvif, NULL)) { 408 IP6_STATINC(IP6_STAT_BADSCOPE); 409 goto bad; 410 } 411 412 ro = rtcache_percpu_getref(ip6_forward_rt_percpu); 413 414 /* 415 * Multicast check 416 */ 417 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 418 bool ingroup; 419 420 in6_ifstat_inc(rcvif, ifs6_in_mcast); 421 /* 422 * See if we belong to the destination multicast group on the 423 * arrival interface. 424 */ 425 ingroup = in6_multi_group(&ip6->ip6_dst, rcvif); 426 if (ingroup) { 427 ours = 1; 428 } else if (!ip6_mrouter) { 429 uint64_t *ip6s = IP6_STAT_GETREF(); 430 ip6s[IP6_STAT_NOTMEMBER]++; 431 ip6s[IP6_STAT_CANTFORWARD]++; 432 IP6_STAT_PUTREF(); 433 in6_ifstat_inc(rcvif, ifs6_in_discard); 434 goto bad_unref; 435 } 436 deliverifp = rcvif; 437 goto hbhcheck; 438 } 439 440 sockaddr_in6_init(&u.dst6, &ip6->ip6_dst, 0, 0, 0); 441 442 /* 443 * Unicast check 444 */ 445 rt = rtcache_lookup2(ro, &u.dst, 1, &hit); 446 if (hit) 447 IP6_STATINC(IP6_STAT_FORWARD_CACHEHIT); 448 else 449 IP6_STATINC(IP6_STAT_FORWARD_CACHEMISS); 450 451 /* 452 * Accept the packet if the forwarding interface to the destination 453 * (according to the routing table) is the loopback interface, 454 * unless the associated route has a gateway. 455 * 456 * We don't explicitly match ip6_dst against an interface here. It 457 * is already done in rtcache_lookup2: rt->rt_ifp->if_type will be 458 * IFT_LOOP if the packet is for us. 459 * 460 * Note that this approach causes to accept a packet if there is a 461 * route to the loopback interface for the destination of the packet. 462 * But we think it's even useful in some situations, e.g. when using 463 * a special daemon which wants to intercept the packet. 464 */ 465 if (rt != NULL && 466 (rt->rt_flags & (RTF_HOST|RTF_GATEWAY)) == RTF_HOST && 467 rt->rt_ifp->if_type == IFT_LOOP) { 468 struct in6_ifaddr *ia6 = (struct in6_ifaddr *)rt->rt_ifa; 469 int addrok; 470 471 if (ia6->ia6_flags & IN6_IFF_ANYCAST) 472 m->m_flags |= M_ANYCAST6; 473 /* 474 * packets to a tentative, duplicated, or somehow invalid 475 * address must not be accepted. 476 */ 477 if (ia6->ia6_flags & IN6_IFF_NOTREADY) 478 addrok = 0; 479 else if (ia6->ia6_flags & IN6_IFF_DETACHED && 480 !IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) 481 { 482 /* Allow internal traffic to DETACHED addresses */ 483 struct sockaddr_in6 sin6; 484 int s; 485 486 memset(&sin6, 0, sizeof(sin6)); 487 sin6.sin6_family = AF_INET6; 488 sin6.sin6_len = sizeof(sin6); 489 sin6.sin6_addr = ip6->ip6_src; 490 s = pserialize_read_enter(); 491 addrok = (ifa_ifwithaddr(sin6tosa(&sin6)) != NULL); 492 pserialize_read_exit(s); 493 } else 494 addrok = 1; 495 if (addrok) { 496 /* this address is ready */ 497 ours = 1; 498 deliverifp = ia6->ia_ifp; /* correct? */ 499 goto hbhcheck; 500 } else { 501 /* address is not ready, so discard the packet. */ 502 char ip6bufs[INET6_ADDRSTRLEN]; 503 char ip6bufd[INET6_ADDRSTRLEN]; 504 nd6log(LOG_INFO, "packet to an unready address %s->%s\n", 505 IN6_PRINT(ip6bufs, &ip6->ip6_src), 506 IN6_PRINT(ip6bufd, &ip6->ip6_dst)); 507 508 goto bad_unref; 509 } 510 } 511 512 /* 513 * FAITH (Firewall Aided Internet Translator) 514 */ 515 #if defined(NFAITH) && 0 < NFAITH 516 if (ip6_keepfaith) { 517 if (rt != NULL && rt->rt_ifp != NULL && 518 rt->rt_ifp->if_type == IFT_FAITH) { 519 /* XXX do we need more sanity checks? */ 520 ours = 1; 521 deliverifp = rt->rt_ifp; /* faith */ 522 goto hbhcheck; 523 } 524 } 525 #endif 526 527 /* 528 * Now there is no reason to process the packet if it's not our own 529 * and we're not a router. 530 */ 531 if (!ip6_forwarding) { 532 IP6_STATINC(IP6_STAT_CANTFORWARD); 533 in6_ifstat_inc(rcvif, ifs6_in_discard); 534 goto bad_unref; 535 } 536 537 hbhcheck: 538 /* 539 * Record address information into m_tag, if we don't have one yet. 540 * Note that we are unable to record it, if the address is not listed 541 * as our interface address (e.g. multicast addresses, addresses 542 * within FAITH prefixes and such). 543 */ 544 if (deliverifp && ip6_getdstifaddr(m) == NULL) { 545 struct in6_ifaddr *ia6; 546 int s = pserialize_read_enter(); 547 548 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 549 /* Depends on ip6_setdstifaddr never sleep */ 550 if (ia6 != NULL && ip6_setdstifaddr(m, ia6) == NULL) { 551 /* 552 * XXX maybe we should drop the packet here, 553 * as we could not provide enough information 554 * to the upper layers. 555 */ 556 } 557 pserialize_read_exit(s); 558 } 559 560 /* 561 * Process Hop-by-Hop options header if it's contained. 562 * m may be modified in ip6_hopopts_input(). 563 * If a JumboPayload option is included, plen will also be modified. 564 */ 565 plen = (u_int32_t)ntohs(ip6->ip6_plen); 566 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 567 struct ip6_hbh *hbh; 568 569 if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) { 570 /* m already freed */ 571 in6_ifstat_inc(rcvif, ifs6_in_discard); 572 rtcache_unref(rt, ro); 573 rtcache_percpu_putref(ip6_forward_rt_percpu); 574 return; 575 } 576 577 /* adjust pointer */ 578 ip6 = mtod(m, struct ip6_hdr *); 579 580 /* 581 * if the payload length field is 0 and the next header field 582 * indicates Hop-by-Hop Options header, then a Jumbo Payload 583 * option MUST be included. 584 */ 585 if (ip6->ip6_plen == 0 && plen == 0) { 586 /* 587 * Note that if a valid jumbo payload option is 588 * contained, ip6_hopopts_input() must set a valid 589 * (non-zero) payload length to the variable plen. 590 */ 591 IP6_STATINC(IP6_STAT_BADOPTIONS); 592 in6_ifstat_inc(rcvif, ifs6_in_discard); 593 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 594 icmp6_error(m, ICMP6_PARAM_PROB, 595 ICMP6_PARAMPROB_HEADER, 596 (char *)&ip6->ip6_plen - (char *)ip6); 597 rtcache_unref(rt, ro); 598 rtcache_percpu_putref(ip6_forward_rt_percpu); 599 return; 600 } 601 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 602 sizeof(struct ip6_hbh)); 603 if (hbh == NULL) { 604 IP6_STATINC(IP6_STAT_TOOSHORT); 605 rtcache_unref(rt, ro); 606 rtcache_percpu_putref(ip6_forward_rt_percpu); 607 return; 608 } 609 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 610 nxt = hbh->ip6h_nxt; 611 612 /* 613 * accept the packet if a router alert option is included 614 * and we act as an IPv6 router. 615 */ 616 if (rtalert != ~0 && ip6_forwarding) 617 ours = 1; 618 } else 619 nxt = ip6->ip6_nxt; 620 621 /* 622 * Check that the amount of data in the buffers is at least much as 623 * the IPv6 header would have us expect. Trim mbufs if longer than we 624 * expect. Drop packet if shorter than we expect. 625 */ 626 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 627 IP6_STATINC(IP6_STAT_TOOSHORT); 628 in6_ifstat_inc(rcvif, ifs6_in_truncated); 629 goto bad_unref; 630 } 631 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 632 if (m->m_len == m->m_pkthdr.len) { 633 m->m_len = sizeof(struct ip6_hdr) + plen; 634 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 635 } else 636 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 637 } 638 639 /* 640 * Forward if desirable. 641 */ 642 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 643 /* 644 * If we are acting as a multicast router, all 645 * incoming multicast packets are passed to the 646 * kernel-level multicast forwarding function. 647 * The packet is returned (relatively) intact; if 648 * ip6_mforward() returns a non-zero value, the packet 649 * must be discarded, else it may be accepted below. 650 */ 651 if (ip6_mrouter != NULL) { 652 int error; 653 654 SOFTNET_LOCK(); 655 error = ip6_mforward(ip6, rcvif, m); 656 SOFTNET_UNLOCK(); 657 658 if (error != 0) { 659 rtcache_unref(rt, ro); 660 rtcache_percpu_putref(ip6_forward_rt_percpu); 661 IP6_STATINC(IP6_STAT_CANTFORWARD); 662 goto bad; 663 } 664 } 665 if (!ours) 666 goto bad_unref; 667 } else if (!ours) { 668 rtcache_unref(rt, ro); 669 rtcache_percpu_putref(ip6_forward_rt_percpu); 670 ip6_forward(m, srcrt); 671 return; 672 } 673 674 ip6 = mtod(m, struct ip6_hdr *); 675 676 /* 677 * Malicious party may be able to use IPv4 mapped addr to confuse 678 * tcp/udp stack and bypass security checks (act as if it was from 679 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious. 680 * 681 * For SIIT end node behavior, you may want to disable the check. 682 * However, you will become vulnerable to attacks using IPv4 mapped 683 * source. 684 */ 685 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 686 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 687 IP6_STATINC(IP6_STAT_BADSCOPE); 688 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 689 goto bad_unref; 690 } 691 692 #ifdef IFA_STATS 693 if (deliverifp != NULL) { 694 struct in6_ifaddr *ia6; 695 int s = pserialize_read_enter(); 696 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 697 if (ia6) 698 ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len; 699 pserialize_read_exit(s); 700 } 701 #endif 702 IP6_STATINC(IP6_STAT_DELIVERED); 703 in6_ifstat_inc(deliverifp, ifs6_in_deliver); 704 nest = 0; 705 706 if (rt != NULL) { 707 rtcache_unref(rt, ro); 708 rt = NULL; 709 } 710 rtcache_percpu_putref(ip6_forward_rt_percpu); 711 712 rh_present = 0; 713 frg_present = 0; 714 while (nxt != IPPROTO_DONE) { 715 if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) { 716 IP6_STATINC(IP6_STAT_TOOMANYHDR); 717 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 718 goto bad; 719 } 720 721 M_VERIFY_PACKET(m); 722 723 /* 724 * protection against faulty packet - there should be 725 * more sanity checks in header chain processing. 726 */ 727 if (m->m_pkthdr.len < off) { 728 IP6_STATINC(IP6_STAT_TOOSHORT); 729 in6_ifstat_inc(rcvif, ifs6_in_truncated); 730 goto bad; 731 } 732 733 if (nxt == IPPROTO_ROUTING) { 734 if (rh_present++) { 735 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 736 IP6_STATINC(IP6_STAT_BADOPTIONS); 737 goto bad; 738 } 739 } else if (nxt == IPPROTO_FRAGMENT) { 740 if (frg_present++) { 741 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 742 IP6_STATINC(IP6_STAT_BADOPTIONS); 743 goto bad; 744 } 745 } 746 747 #ifdef IPSEC 748 if (ipsec_used) { 749 /* 750 * Enforce IPsec policy checking if we are seeing last 751 * header. Note that we do not visit this with 752 * protocols with pcb layer code - like udp/tcp/raw ip. 753 */ 754 if ((inet6sw[ip6_protox[nxt]].pr_flags 755 & PR_LASTHDR) != 0) { 756 int error; 757 758 error = ipsec_ip_input_checkpolicy(m, false); 759 if (error) { 760 IP6_STATINC(IP6_STAT_IPSECDROP_IN); 761 goto bad; 762 } 763 } 764 } 765 #endif 766 767 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt); 768 } 769 return; 770 771 bad_unref: 772 rtcache_unref(rt, ro); 773 rtcache_percpu_putref(ip6_forward_rt_percpu); 774 bad: 775 m_freem(m); 776 return; 777 } 778 779 static bool 780 ip6_badaddr(struct ip6_hdr *ip6) 781 { 782 /* Check against address spoofing/corruption. */ 783 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) || 784 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) { 785 return true; 786 } 787 788 /* 789 * The following check is not documented in specs. A malicious 790 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack 791 * and bypass security checks (act as if it was from 127.0.0.1 by using 792 * IPv6 src ::ffff:127.0.0.1). Be cautious. 793 * 794 * This check chokes if we are in an SIIT cloud. As none of BSDs 795 * support IPv4-less kernel compilation, we cannot support SIIT 796 * environment at all. So, it makes more sense for us to reject any 797 * malicious packets for non-SIIT environment, than try to do a 798 * partial support for SIIT environment. 799 */ 800 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 801 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 802 return true; 803 } 804 805 /* 806 * Reject packets with IPv4-compatible IPv6 addresses (RFC4291). 807 */ 808 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) || 809 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) { 810 return true; 811 } 812 813 return false; 814 } 815 816 /* 817 * set/grab in6_ifaddr correspond to IPv6 destination address. 818 */ 819 static struct m_tag * 820 ip6_setdstifaddr(struct mbuf *m, const struct in6_ifaddr *ia) 821 { 822 struct m_tag *mtag; 823 struct ip6aux *ip6a; 824 825 mtag = ip6_addaux(m); 826 if (mtag == NULL) 827 return NULL; 828 829 ip6a = (struct ip6aux *)(mtag + 1); 830 if (in6_setscope(&ip6a->ip6a_src, ia->ia_ifp, &ip6a->ip6a_scope_id)) { 831 IP6_STATINC(IP6_STAT_BADSCOPE); 832 return NULL; 833 } 834 835 ip6a->ip6a_src = ia->ia_addr.sin6_addr; 836 ip6a->ip6a_flags = ia->ia6_flags; 837 return mtag; 838 } 839 840 const struct ip6aux * 841 ip6_getdstifaddr(struct mbuf *m) 842 { 843 struct m_tag *mtag; 844 845 mtag = ip6_findaux(m); 846 if (mtag != NULL) 847 return (struct ip6aux *)(mtag + 1); 848 else 849 return NULL; 850 } 851 852 /* 853 * Hop-by-Hop options header processing. If a valid jumbo payload option is 854 * included, the real payload length will be stored in plenp. 855 * 856 * rtalertp - XXX: should be stored more smart way 857 */ 858 int 859 ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp, 860 struct mbuf **mp, int *offp) 861 { 862 struct mbuf *m = *mp; 863 int off = *offp, hbhlen; 864 struct ip6_hbh *hbh; 865 866 /* validation of the length of the header */ 867 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, 868 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh)); 869 if (hbh == NULL) { 870 IP6_STATINC(IP6_STAT_TOOSHORT); 871 return -1; 872 } 873 hbhlen = (hbh->ip6h_len + 1) << 3; 874 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 875 hbhlen); 876 if (hbh == NULL) { 877 IP6_STATINC(IP6_STAT_TOOSHORT); 878 return -1; 879 } 880 KASSERT(IP6_HDR_ALIGNED_P(hbh)); 881 off += hbhlen; 882 hbhlen -= sizeof(struct ip6_hbh); 883 884 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 885 hbhlen, rtalertp, plenp) < 0) 886 return -1; 887 888 *offp = off; 889 *mp = m; 890 return 0; 891 } 892 893 /* 894 * Search header for all Hop-by-hop options and process each option. 895 * This function is separate from ip6_hopopts_input() in order to 896 * handle a case where the sending node itself process its hop-by-hop 897 * options header. In such a case, the function is called from ip6_output(). 898 * 899 * The function assumes that hbh header is located right after the IPv6 header 900 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to 901 * opthead + hbhlen is located in continuous memory region. 902 */ 903 static int 904 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen, 905 u_int32_t *rtalertp, u_int32_t *plenp) 906 { 907 struct ip6_hdr *ip6; 908 int optlen = 0; 909 u_int8_t *opt = opthead; 910 u_int16_t rtalert_val; 911 u_int32_t jumboplen; 912 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh); 913 914 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 915 switch (*opt) { 916 case IP6OPT_PAD1: 917 optlen = 1; 918 break; 919 case IP6OPT_PADN: 920 if (hbhlen < IP6OPT_MINLEN) { 921 IP6_STATINC(IP6_STAT_TOOSMALL); 922 goto bad; 923 } 924 optlen = *(opt + 1) + 2; 925 break; 926 case IP6OPT_RTALERT: 927 /* XXX may need check for alignment */ 928 if (hbhlen < IP6OPT_RTALERT_LEN) { 929 IP6_STATINC(IP6_STAT_TOOSMALL); 930 goto bad; 931 } 932 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) { 933 /* XXX stat */ 934 icmp6_error(m, ICMP6_PARAM_PROB, 935 ICMP6_PARAMPROB_HEADER, 936 erroff + opt + 1 - opthead); 937 return (-1); 938 } 939 optlen = IP6OPT_RTALERT_LEN; 940 memcpy((void *)&rtalert_val, (void *)(opt + 2), 2); 941 *rtalertp = ntohs(rtalert_val); 942 break; 943 case IP6OPT_JUMBO: 944 /* XXX may need check for alignment */ 945 if (hbhlen < IP6OPT_JUMBO_LEN) { 946 IP6_STATINC(IP6_STAT_TOOSMALL); 947 goto bad; 948 } 949 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) { 950 /* XXX stat */ 951 icmp6_error(m, ICMP6_PARAM_PROB, 952 ICMP6_PARAMPROB_HEADER, 953 erroff + opt + 1 - opthead); 954 return (-1); 955 } 956 optlen = IP6OPT_JUMBO_LEN; 957 958 /* 959 * IPv6 packets that have non 0 payload length 960 * must not contain a jumbo payload option. 961 */ 962 ip6 = mtod(m, struct ip6_hdr *); 963 if (ip6->ip6_plen) { 964 IP6_STATINC(IP6_STAT_BADOPTIONS); 965 icmp6_error(m, ICMP6_PARAM_PROB, 966 ICMP6_PARAMPROB_HEADER, 967 erroff + opt - opthead); 968 return (-1); 969 } 970 971 /* 972 * We may see jumbolen in unaligned location, so 973 * we'd need to perform memcpy(). 974 */ 975 memcpy(&jumboplen, opt + 2, sizeof(jumboplen)); 976 jumboplen = (u_int32_t)htonl(jumboplen); 977 978 #if 1 979 /* 980 * if there are multiple jumbo payload options, 981 * *plenp will be non-zero and the packet will be 982 * rejected. 983 * the behavior may need some debate in ipngwg - 984 * multiple options does not make sense, however, 985 * there's no explicit mention in specification. 986 */ 987 if (*plenp != 0) { 988 IP6_STATINC(IP6_STAT_BADOPTIONS); 989 icmp6_error(m, ICMP6_PARAM_PROB, 990 ICMP6_PARAMPROB_HEADER, 991 erroff + opt + 2 - opthead); 992 return (-1); 993 } 994 #endif 995 996 /* 997 * jumbo payload length must be larger than 65535. 998 */ 999 if (jumboplen <= IPV6_MAXPACKET) { 1000 IP6_STATINC(IP6_STAT_BADOPTIONS); 1001 icmp6_error(m, ICMP6_PARAM_PROB, 1002 ICMP6_PARAMPROB_HEADER, 1003 erroff + opt + 2 - opthead); 1004 return (-1); 1005 } 1006 *plenp = jumboplen; 1007 1008 break; 1009 default: /* unknown option */ 1010 if (hbhlen < IP6OPT_MINLEN) { 1011 IP6_STATINC(IP6_STAT_TOOSMALL); 1012 goto bad; 1013 } 1014 optlen = ip6_unknown_opt(opt, m, 1015 erroff + opt - opthead); 1016 if (optlen == -1) 1017 return (-1); 1018 optlen += 2; 1019 break; 1020 } 1021 } 1022 1023 return (0); 1024 1025 bad: 1026 m_freem(m); 1027 return (-1); 1028 } 1029 1030 /* 1031 * Unknown option processing. 1032 * The third argument `off' is the offset from the IPv6 header to the option, 1033 * which is necessary if the IPv6 header the and option header and IPv6 header 1034 * is not continuous in order to return an ICMPv6 error. 1035 */ 1036 int 1037 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off) 1038 { 1039 struct ip6_hdr *ip6; 1040 1041 switch (IP6OPT_TYPE(*optp)) { 1042 case IP6OPT_TYPE_SKIP: /* ignore the option */ 1043 return ((int)*(optp + 1)); 1044 case IP6OPT_TYPE_DISCARD: /* silently discard */ 1045 m_freem(m); 1046 return (-1); 1047 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 1048 IP6_STATINC(IP6_STAT_BADOPTIONS); 1049 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 1050 return (-1); 1051 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 1052 IP6_STATINC(IP6_STAT_BADOPTIONS); 1053 ip6 = mtod(m, struct ip6_hdr *); 1054 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 1055 (m->m_flags & (M_BCAST|M_MCAST))) 1056 m_freem(m); 1057 else 1058 icmp6_error(m, ICMP6_PARAM_PROB, 1059 ICMP6_PARAMPROB_OPTION, off); 1060 return (-1); 1061 } 1062 1063 m_freem(m); /* XXX: NOTREACHED */ 1064 return (-1); 1065 } 1066 1067 void 1068 ip6_savecontrol(struct in6pcb *in6p, struct mbuf **mp, 1069 struct ip6_hdr *ip6, struct mbuf *m) 1070 { 1071 struct socket *so = in6p->in6p_socket; 1072 #ifdef RFC2292 1073 #define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y)) 1074 #else 1075 #define IS2292(x, y) (y) 1076 #endif 1077 1078 KASSERT(m->m_flags & M_PKTHDR); 1079 1080 if (SOOPT_TIMESTAMP(so->so_options)) 1081 mp = sbsavetimestamp(so->so_options, mp); 1082 1083 /* some OSes call this logic with IPv4 packet, for SO_TIMESTAMP */ 1084 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) 1085 return; 1086 1087 /* RFC 2292 sec. 5 */ 1088 if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) { 1089 struct in6_pktinfo pi6; 1090 1091 memcpy(&pi6.ipi6_addr, &ip6->ip6_dst, sizeof(struct in6_addr)); 1092 in6_clearscope(&pi6.ipi6_addr); /* XXX */ 1093 pi6.ipi6_ifindex = m->m_pkthdr.rcvif_index; 1094 *mp = sbcreatecontrol(&pi6, sizeof(pi6), 1095 IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6); 1096 if (*mp) 1097 mp = &(*mp)->m_next; 1098 } 1099 1100 if (in6p->in6p_flags & IN6P_HOPLIMIT) { 1101 int hlim = ip6->ip6_hlim & 0xff; 1102 1103 *mp = sbcreatecontrol(&hlim, sizeof(hlim), 1104 IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6); 1105 if (*mp) 1106 mp = &(*mp)->m_next; 1107 } 1108 1109 if ((in6p->in6p_flags & IN6P_TCLASS) != 0) { 1110 u_int32_t flowinfo; 1111 int tclass; 1112 1113 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK); 1114 flowinfo >>= 20; 1115 1116 tclass = flowinfo & 0xff; 1117 *mp = sbcreatecontrol(&tclass, sizeof(tclass), 1118 IPV6_TCLASS, IPPROTO_IPV6); 1119 1120 if (*mp) 1121 mp = &(*mp)->m_next; 1122 } 1123 1124 /* 1125 * IPV6_HOPOPTS socket option. Recall that we required super-user 1126 * privilege for the option (see ip6_ctloutput), but it might be too 1127 * strict, since there might be some hop-by-hop options which can be 1128 * returned to normal user. 1129 * See also RFC3542 section 8 (or RFC2292 section 6). 1130 */ 1131 if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0) { 1132 /* 1133 * Check if a hop-by-hop options header is contatined in the 1134 * received packet, and if so, store the options as ancillary 1135 * data. Note that a hop-by-hop options header must be 1136 * just after the IPv6 header, which fact is assured through 1137 * the IPv6 input processing. 1138 */ 1139 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1140 if (xip6->ip6_nxt == IPPROTO_HOPOPTS) { 1141 struct ip6_hbh *hbh; 1142 int hbhlen; 1143 struct mbuf *ext; 1144 1145 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr), 1146 xip6->ip6_nxt); 1147 if (ext == NULL) { 1148 IP6_STATINC(IP6_STAT_TOOSHORT); 1149 return; 1150 } 1151 hbh = mtod(ext, struct ip6_hbh *); 1152 hbhlen = (hbh->ip6h_len + 1) << 3; 1153 if (hbhlen != ext->m_len) { 1154 m_freem(ext); 1155 IP6_STATINC(IP6_STAT_TOOSHORT); 1156 return; 1157 } 1158 1159 /* 1160 * XXX: We copy whole the header even if a jumbo 1161 * payload option is included, which option is to 1162 * be removed before returning in the RFC 2292. 1163 * Note: this constraint is removed in RFC3542. 1164 */ 1165 *mp = sbcreatecontrol(hbh, hbhlen, 1166 IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS), 1167 IPPROTO_IPV6); 1168 if (*mp) 1169 mp = &(*mp)->m_next; 1170 m_freem(ext); 1171 } 1172 } 1173 1174 /* IPV6_DSTOPTS and IPV6_RTHDR socket options */ 1175 if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) { 1176 struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); 1177 int nxt = xip6->ip6_nxt, off = sizeof(struct ip6_hdr); 1178 1179 /* 1180 * Search for destination options headers or routing 1181 * header(s) through the header chain, and stores each 1182 * header as ancillary data. 1183 * Note that the order of the headers remains in 1184 * the chain of ancillary data. 1185 */ 1186 for (;;) { /* is explicit loop prevention necessary? */ 1187 struct ip6_ext *ip6e = NULL; 1188 int elen; 1189 struct mbuf *ext = NULL; 1190 1191 /* 1192 * if it is not an extension header, don't try to 1193 * pull it from the chain. 1194 */ 1195 switch (nxt) { 1196 case IPPROTO_DSTOPTS: 1197 case IPPROTO_ROUTING: 1198 case IPPROTO_HOPOPTS: 1199 case IPPROTO_AH: /* is it possible? */ 1200 break; 1201 default: 1202 goto loopend; 1203 } 1204 1205 ext = ip6_pullexthdr(m, off, nxt); 1206 if (ext == NULL) { 1207 IP6_STATINC(IP6_STAT_TOOSHORT); 1208 return; 1209 } 1210 ip6e = mtod(ext, struct ip6_ext *); 1211 if (nxt == IPPROTO_AH) 1212 elen = (ip6e->ip6e_len + 2) << 2; 1213 else 1214 elen = (ip6e->ip6e_len + 1) << 3; 1215 if (elen != ext->m_len) { 1216 m_freem(ext); 1217 IP6_STATINC(IP6_STAT_TOOSHORT); 1218 return; 1219 } 1220 KASSERT(IP6_HDR_ALIGNED_P(ip6e)); 1221 1222 switch (nxt) { 1223 case IPPROTO_DSTOPTS: 1224 if (!(in6p->in6p_flags & IN6P_DSTOPTS)) 1225 break; 1226 1227 *mp = sbcreatecontrol(ip6e, elen, 1228 IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS), 1229 IPPROTO_IPV6); 1230 if (*mp) 1231 mp = &(*mp)->m_next; 1232 break; 1233 1234 case IPPROTO_ROUTING: 1235 if (!(in6p->in6p_flags & IN6P_RTHDR)) 1236 break; 1237 1238 *mp = sbcreatecontrol(ip6e, elen, 1239 IS2292(IPV6_2292RTHDR, IPV6_RTHDR), 1240 IPPROTO_IPV6); 1241 if (*mp) 1242 mp = &(*mp)->m_next; 1243 break; 1244 1245 case IPPROTO_HOPOPTS: 1246 case IPPROTO_AH: /* is it possible? */ 1247 break; 1248 1249 default: 1250 /* 1251 * other cases have been filtered in the above. 1252 * none will visit this case. here we supply 1253 * the code just in case (nxt overwritten or 1254 * other cases). 1255 */ 1256 m_freem(ext); 1257 goto loopend; 1258 1259 } 1260 1261 /* proceed with the next header. */ 1262 off += elen; 1263 nxt = ip6e->ip6e_nxt; 1264 ip6e = NULL; 1265 m_freem(ext); 1266 ext = NULL; 1267 } 1268 loopend: 1269 ; 1270 } 1271 } 1272 #undef IS2292 1273 1274 1275 void 1276 ip6_notify_pmtu(struct in6pcb *in6p, const struct sockaddr_in6 *dst, 1277 uint32_t *mtu) 1278 { 1279 struct socket *so; 1280 struct mbuf *m_mtu; 1281 struct ip6_mtuinfo mtuctl; 1282 1283 so = in6p->in6p_socket; 1284 1285 if (mtu == NULL) 1286 return; 1287 1288 KASSERT(so != NULL); 1289 1290 memset(&mtuctl, 0, sizeof(mtuctl)); /* zero-clear for safety */ 1291 mtuctl.ip6m_mtu = *mtu; 1292 mtuctl.ip6m_addr = *dst; 1293 if (sa6_recoverscope(&mtuctl.ip6m_addr)) 1294 return; 1295 1296 if ((m_mtu = sbcreatecontrol(&mtuctl, sizeof(mtuctl), 1297 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL) 1298 return; 1299 1300 if (sbappendaddr(&so->so_rcv, (const struct sockaddr *)dst, NULL, m_mtu) 1301 == 0) { 1302 soroverflow(so); 1303 m_freem(m_mtu); 1304 } else 1305 sorwakeup(so); 1306 1307 return; 1308 } 1309 1310 /* 1311 * pull single extension header from mbuf chain. returns single mbuf that 1312 * contains the result, or NULL on error. 1313 */ 1314 static struct mbuf * 1315 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt) 1316 { 1317 struct ip6_ext ip6e; 1318 size_t elen; 1319 struct mbuf *n; 1320 1321 if (off + sizeof(ip6e) > m->m_pkthdr.len) 1322 return NULL; 1323 1324 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1325 if (nxt == IPPROTO_AH) 1326 elen = (ip6e.ip6e_len + 2) << 2; 1327 else 1328 elen = (ip6e.ip6e_len + 1) << 3; 1329 1330 if (off + elen > m->m_pkthdr.len) 1331 return NULL; 1332 1333 MGET(n, M_DONTWAIT, MT_DATA); 1334 if (n && elen >= MLEN) { 1335 MCLGET(n, M_DONTWAIT); 1336 if ((n->m_flags & M_EXT) == 0) { 1337 m_free(n); 1338 n = NULL; 1339 } 1340 } 1341 if (!n) 1342 return NULL; 1343 1344 n->m_len = 0; 1345 if (elen >= M_TRAILINGSPACE(n)) { 1346 m_free(n); 1347 return NULL; 1348 } 1349 1350 m_copydata(m, off, elen, mtod(n, void *)); 1351 n->m_len = elen; 1352 return n; 1353 } 1354 1355 /* 1356 * Get offset to the previous header followed by the header 1357 * currently processed. 1358 */ 1359 int 1360 ip6_get_prevhdr(struct mbuf *m, int off) 1361 { 1362 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1363 1364 if (off == sizeof(struct ip6_hdr)) { 1365 return offsetof(struct ip6_hdr, ip6_nxt); 1366 } else if (off < sizeof(struct ip6_hdr)) { 1367 panic("%s: off < sizeof(struct ip6_hdr)", __func__); 1368 } else { 1369 int len, nlen, nxt; 1370 struct ip6_ext ip6e; 1371 1372 nxt = ip6->ip6_nxt; 1373 len = sizeof(struct ip6_hdr); 1374 nlen = 0; 1375 while (len < off) { 1376 m_copydata(m, len, sizeof(ip6e), &ip6e); 1377 1378 switch (nxt) { 1379 case IPPROTO_FRAGMENT: 1380 nlen = sizeof(struct ip6_frag); 1381 break; 1382 case IPPROTO_AH: 1383 nlen = (ip6e.ip6e_len + 2) << 2; 1384 break; 1385 default: 1386 nlen = (ip6e.ip6e_len + 1) << 3; 1387 break; 1388 } 1389 len += nlen; 1390 nxt = ip6e.ip6e_nxt; 1391 } 1392 1393 return (len - nlen); 1394 } 1395 } 1396 1397 /* 1398 * get next header offset. m will be retained. 1399 */ 1400 int 1401 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp) 1402 { 1403 struct ip6_hdr ip6; 1404 struct ip6_ext ip6e; 1405 struct ip6_frag fh; 1406 1407 /* just in case */ 1408 if (m == NULL) 1409 panic("%s: m == NULL", __func__); 1410 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off) 1411 return -1; 1412 1413 switch (proto) { 1414 case IPPROTO_IPV6: 1415 /* do not chase beyond intermediate IPv6 headers */ 1416 if (off != 0) 1417 return -1; 1418 if (m->m_pkthdr.len < off + sizeof(ip6)) 1419 return -1; 1420 m_copydata(m, off, sizeof(ip6), (void *)&ip6); 1421 if (nxtp) 1422 *nxtp = ip6.ip6_nxt; 1423 off += sizeof(ip6); 1424 return off; 1425 1426 case IPPROTO_FRAGMENT: 1427 /* 1428 * terminate parsing if it is not the first fragment, 1429 * it does not make sense to parse through it. 1430 */ 1431 if (m->m_pkthdr.len < off + sizeof(fh)) 1432 return -1; 1433 m_copydata(m, off, sizeof(fh), (void *)&fh); 1434 if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0) 1435 return -1; 1436 if (nxtp) 1437 *nxtp = fh.ip6f_nxt; 1438 off += sizeof(struct ip6_frag); 1439 return off; 1440 1441 case IPPROTO_AH: 1442 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1443 return -1; 1444 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1445 if (nxtp) 1446 *nxtp = ip6e.ip6e_nxt; 1447 off += (ip6e.ip6e_len + 2) << 2; 1448 if (m->m_pkthdr.len < off) 1449 return -1; 1450 return off; 1451 1452 case IPPROTO_HOPOPTS: 1453 case IPPROTO_ROUTING: 1454 case IPPROTO_DSTOPTS: 1455 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1456 return -1; 1457 m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); 1458 if (nxtp) 1459 *nxtp = ip6e.ip6e_nxt; 1460 off += (ip6e.ip6e_len + 1) << 3; 1461 if (m->m_pkthdr.len < off) 1462 return -1; 1463 return off; 1464 1465 case IPPROTO_NONE: 1466 case IPPROTO_ESP: 1467 case IPPROTO_IPCOMP: 1468 /* give up */ 1469 return -1; 1470 1471 default: 1472 return -1; 1473 } 1474 } 1475 1476 /* 1477 * get offset for the last header in the chain. m will be kept untainted. 1478 */ 1479 int 1480 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp) 1481 { 1482 int newoff; 1483 int nxt; 1484 1485 if (!nxtp) { 1486 nxt = -1; 1487 nxtp = &nxt; 1488 } 1489 for (;;) { 1490 newoff = ip6_nexthdr(m, off, proto, nxtp); 1491 if (newoff < 0) 1492 return off; 1493 else if (newoff < off) 1494 return -1; /* invalid */ 1495 else if (newoff == off) 1496 return newoff; 1497 1498 off = newoff; 1499 proto = *nxtp; 1500 } 1501 } 1502 1503 static struct m_tag * 1504 ip6_addaux(struct mbuf *m) 1505 { 1506 struct m_tag *mtag; 1507 1508 mtag = m_tag_find(m, PACKET_TAG_INET6); 1509 if (!mtag) { 1510 mtag = m_tag_get(PACKET_TAG_INET6, sizeof(struct ip6aux), 1511 M_NOWAIT); 1512 if (mtag) { 1513 m_tag_prepend(m, mtag); 1514 memset(mtag + 1, 0, sizeof(struct ip6aux)); 1515 } 1516 } 1517 return mtag; 1518 } 1519 1520 static struct m_tag * 1521 ip6_findaux(struct mbuf *m) 1522 { 1523 struct m_tag *mtag; 1524 1525 mtag = m_tag_find(m, PACKET_TAG_INET6); 1526 return mtag; 1527 } 1528 1529 static void 1530 ip6_delaux(struct mbuf *m) 1531 { 1532 struct m_tag *mtag; 1533 1534 mtag = m_tag_find(m, PACKET_TAG_INET6); 1535 if (mtag) 1536 m_tag_delete(m, mtag); 1537 } 1538 1539 /* 1540 * System control for IP6 1541 */ 1542 1543 const u_char inet6ctlerrmap[PRC_NCMDS] = { 1544 0, 0, 0, 0, 1545 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 1546 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 1547 EMSGSIZE, EHOSTUNREACH, 0, 0, 1548 0, 0, 0, 0, 1549 ENOPROTOOPT 1550 }; 1551 1552 extern int sysctl_net_inet6_addrctlpolicy(SYSCTLFN_ARGS); 1553 1554 static int 1555 sysctl_net_inet6_ip6_stats(SYSCTLFN_ARGS) 1556 { 1557 1558 return (NETSTAT_SYSCTL(ip6stat_percpu, IP6_NSTATS)); 1559 } 1560 1561 static void 1562 sysctl_net_inet6_ip6_setup(struct sysctllog **clog) 1563 { 1564 1565 sysctl_createv(clog, 0, NULL, NULL, 1566 CTLFLAG_PERMANENT, 1567 CTLTYPE_NODE, "inet6", 1568 SYSCTL_DESCR("PF_INET6 related settings"), 1569 NULL, 0, NULL, 0, 1570 CTL_NET, PF_INET6, CTL_EOL); 1571 sysctl_createv(clog, 0, NULL, NULL, 1572 CTLFLAG_PERMANENT, 1573 CTLTYPE_NODE, "ip6", 1574 SYSCTL_DESCR("IPv6 related settings"), 1575 NULL, 0, NULL, 0, 1576 CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_EOL); 1577 1578 sysctl_createv(clog, 0, NULL, NULL, 1579 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1580 CTLTYPE_INT, "forwarding", 1581 SYSCTL_DESCR("Enable forwarding of INET6 datagrams"), 1582 NULL, 0, &ip6_forwarding, 0, 1583 CTL_NET, PF_INET6, IPPROTO_IPV6, 1584 IPV6CTL_FORWARDING, CTL_EOL); 1585 sysctl_createv(clog, 0, NULL, NULL, 1586 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1587 CTLTYPE_INT, "redirect", 1588 SYSCTL_DESCR("Enable sending of ICMPv6 redirect messages"), 1589 NULL, 0, &ip6_sendredirects, 0, 1590 CTL_NET, PF_INET6, IPPROTO_IPV6, 1591 IPV6CTL_SENDREDIRECTS, CTL_EOL); 1592 sysctl_createv(clog, 0, NULL, NULL, 1593 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1594 CTLTYPE_INT, "hlim", 1595 SYSCTL_DESCR("Hop limit for an INET6 datagram"), 1596 NULL, 0, &ip6_defhlim, 0, 1597 CTL_NET, PF_INET6, IPPROTO_IPV6, 1598 IPV6CTL_DEFHLIM, CTL_EOL); 1599 sysctl_createv(clog, 0, NULL, NULL, 1600 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1601 CTLTYPE_INT, "maxfragpackets", 1602 SYSCTL_DESCR("Maximum number of fragments to buffer " 1603 "for reassembly"), 1604 NULL, 0, &ip6_maxfragpackets, 0, 1605 CTL_NET, PF_INET6, IPPROTO_IPV6, 1606 IPV6CTL_MAXFRAGPACKETS, CTL_EOL); 1607 sysctl_createv(clog, 0, NULL, NULL, 1608 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1609 CTLTYPE_INT, "keepfaith", 1610 SYSCTL_DESCR("Activate faith interface"), 1611 NULL, 0, &ip6_keepfaith, 0, 1612 CTL_NET, PF_INET6, IPPROTO_IPV6, 1613 IPV6CTL_KEEPFAITH, CTL_EOL); 1614 sysctl_createv(clog, 0, NULL, NULL, 1615 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1616 CTLTYPE_INT, "log_interval", 1617 SYSCTL_DESCR("Minimum interval between logging " 1618 "unroutable packets"), 1619 NULL, 0, &ip6_log_interval, 0, 1620 CTL_NET, PF_INET6, IPPROTO_IPV6, 1621 IPV6CTL_LOG_INTERVAL, CTL_EOL); 1622 sysctl_createv(clog, 0, NULL, NULL, 1623 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1624 CTLTYPE_INT, "hdrnestlimit", 1625 SYSCTL_DESCR("Maximum number of nested IPv6 headers"), 1626 NULL, 0, &ip6_hdrnestlimit, 0, 1627 CTL_NET, PF_INET6, IPPROTO_IPV6, 1628 IPV6CTL_HDRNESTLIMIT, CTL_EOL); 1629 sysctl_createv(clog, 0, NULL, NULL, 1630 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1631 CTLTYPE_INT, "dad_count", 1632 SYSCTL_DESCR("Number of Duplicate Address Detection " 1633 "probes to send"), 1634 NULL, 0, &ip6_dad_count, 0, 1635 CTL_NET, PF_INET6, IPPROTO_IPV6, 1636 IPV6CTL_DAD_COUNT, CTL_EOL); 1637 sysctl_createv(clog, 0, NULL, NULL, 1638 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1639 CTLTYPE_INT, "auto_flowlabel", 1640 SYSCTL_DESCR("Assign random IPv6 flow labels"), 1641 NULL, 0, &ip6_auto_flowlabel, 0, 1642 CTL_NET, PF_INET6, IPPROTO_IPV6, 1643 IPV6CTL_AUTO_FLOWLABEL, CTL_EOL); 1644 sysctl_createv(clog, 0, NULL, NULL, 1645 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1646 CTLTYPE_INT, "defmcasthlim", 1647 SYSCTL_DESCR("Default multicast hop limit"), 1648 NULL, 0, &ip6_defmcasthlim, 0, 1649 CTL_NET, PF_INET6, IPPROTO_IPV6, 1650 IPV6CTL_DEFMCASTHLIM, CTL_EOL); 1651 sysctl_createv(clog, 0, NULL, NULL, 1652 CTLFLAG_PERMANENT, 1653 CTLTYPE_STRING, "kame_version", 1654 SYSCTL_DESCR("KAME Version"), 1655 NULL, 0, __UNCONST(__KAME_VERSION), 0, 1656 CTL_NET, PF_INET6, IPPROTO_IPV6, 1657 IPV6CTL_KAME_VERSION, CTL_EOL); 1658 sysctl_createv(clog, 0, NULL, NULL, 1659 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1660 CTLTYPE_INT, "use_deprecated", 1661 SYSCTL_DESCR("Allow use of deprecated addresses as " 1662 "source addresses"), 1663 NULL, 0, &ip6_use_deprecated, 0, 1664 CTL_NET, PF_INET6, IPPROTO_IPV6, 1665 IPV6CTL_USE_DEPRECATED, CTL_EOL); 1666 sysctl_createv(clog, 0, NULL, NULL, 1667 CTLFLAG_PERMANENT 1668 #ifndef INET6_BINDV6ONLY 1669 |CTLFLAG_READWRITE, 1670 #endif 1671 CTLTYPE_INT, "v6only", 1672 SYSCTL_DESCR("Disallow PF_INET6 sockets from connecting " 1673 "to PF_INET sockets"), 1674 NULL, 0, &ip6_v6only, 0, 1675 CTL_NET, PF_INET6, IPPROTO_IPV6, 1676 IPV6CTL_V6ONLY, CTL_EOL); 1677 sysctl_createv(clog, 0, NULL, NULL, 1678 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1679 CTLTYPE_INT, "anonportmin", 1680 SYSCTL_DESCR("Lowest ephemeral port number to assign"), 1681 sysctl_net_inet_ip_ports, 0, &ip6_anonportmin, 0, 1682 CTL_NET, PF_INET6, IPPROTO_IPV6, 1683 IPV6CTL_ANONPORTMIN, CTL_EOL); 1684 sysctl_createv(clog, 0, NULL, NULL, 1685 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1686 CTLTYPE_INT, "anonportmax", 1687 SYSCTL_DESCR("Highest ephemeral port number to assign"), 1688 sysctl_net_inet_ip_ports, 0, &ip6_anonportmax, 0, 1689 CTL_NET, PF_INET6, IPPROTO_IPV6, 1690 IPV6CTL_ANONPORTMAX, CTL_EOL); 1691 #ifndef IPNOPRIVPORTS 1692 sysctl_createv(clog, 0, NULL, NULL, 1693 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1694 CTLTYPE_INT, "lowportmin", 1695 SYSCTL_DESCR("Lowest privileged ephemeral port number " 1696 "to assign"), 1697 sysctl_net_inet_ip_ports, 0, &ip6_lowportmin, 0, 1698 CTL_NET, PF_INET6, IPPROTO_IPV6, 1699 IPV6CTL_LOWPORTMIN, CTL_EOL); 1700 sysctl_createv(clog, 0, NULL, NULL, 1701 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1702 CTLTYPE_INT, "lowportmax", 1703 SYSCTL_DESCR("Highest privileged ephemeral port number " 1704 "to assign"), 1705 sysctl_net_inet_ip_ports, 0, &ip6_lowportmax, 0, 1706 CTL_NET, PF_INET6, IPPROTO_IPV6, 1707 IPV6CTL_LOWPORTMAX, CTL_EOL); 1708 #endif /* IPNOPRIVPORTS */ 1709 sysctl_createv(clog, 0, NULL, NULL, 1710 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1711 CTLTYPE_INT, "auto_linklocal", 1712 SYSCTL_DESCR("Default value of per-interface flag for " 1713 "adding an IPv6 link-local address to " 1714 "interfaces when attached"), 1715 NULL, 0, &ip6_auto_linklocal, 0, 1716 CTL_NET, PF_INET6, IPPROTO_IPV6, 1717 IPV6CTL_AUTO_LINKLOCAL, CTL_EOL); 1718 sysctl_createv(clog, 0, NULL, NULL, 1719 CTLFLAG_PERMANENT|CTLFLAG_READONLY, 1720 CTLTYPE_STRUCT, "addctlpolicy", 1721 SYSCTL_DESCR("Return the current address control" 1722 " policy"), 1723 sysctl_net_inet6_addrctlpolicy, 0, NULL, 0, 1724 CTL_NET, PF_INET6, IPPROTO_IPV6, 1725 IPV6CTL_ADDRCTLPOLICY, CTL_EOL); 1726 sysctl_createv(clog, 0, NULL, NULL, 1727 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1728 CTLTYPE_INT, "prefer_tempaddr", 1729 SYSCTL_DESCR("Prefer temporary address as source " 1730 "address"), 1731 NULL, 0, &ip6_prefer_tempaddr, 0, 1732 CTL_NET, PF_INET6, IPPROTO_IPV6, 1733 CTL_CREATE, CTL_EOL); 1734 sysctl_createv(clog, 0, NULL, NULL, 1735 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1736 CTLTYPE_INT, "maxfrags", 1737 SYSCTL_DESCR("Maximum fragments in reassembly queue"), 1738 NULL, 0, &ip6_maxfrags, 0, 1739 CTL_NET, PF_INET6, IPPROTO_IPV6, 1740 IPV6CTL_MAXFRAGS, CTL_EOL); 1741 sysctl_createv(clog, 0, NULL, NULL, 1742 CTLFLAG_PERMANENT, 1743 CTLTYPE_STRUCT, "stats", 1744 SYSCTL_DESCR("IPv6 statistics"), 1745 sysctl_net_inet6_ip6_stats, 0, NULL, 0, 1746 CTL_NET, PF_INET6, IPPROTO_IPV6, 1747 IPV6CTL_STATS, CTL_EOL); 1748 sysctl_createv(clog, 0, NULL, NULL, 1749 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1750 CTLTYPE_INT, "use_defaultzone", 1751 SYSCTL_DESCR("Whether to use the default scope zones"), 1752 NULL, 0, &ip6_use_defzone, 0, 1753 CTL_NET, PF_INET6, IPPROTO_IPV6, 1754 IPV6CTL_USE_DEFAULTZONE, CTL_EOL); 1755 sysctl_createv(clog, 0, NULL, NULL, 1756 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1757 CTLTYPE_INT, "mcast_pmtu", 1758 SYSCTL_DESCR("Enable pMTU discovery for multicast packet"), 1759 NULL, 0, &ip6_mcast_pmtu, 0, 1760 CTL_NET, PF_INET6, IPPROTO_IPV6, 1761 CTL_CREATE, CTL_EOL); 1762 /* anonportalgo RFC6056 subtree */ 1763 const struct sysctlnode *portalgo_node; 1764 sysctl_createv(clog, 0, NULL, &portalgo_node, 1765 CTLFLAG_PERMANENT, 1766 CTLTYPE_NODE, "anonportalgo", 1767 SYSCTL_DESCR("Anonymous port algorithm selection (RFC 6056)"), 1768 NULL, 0, NULL, 0, 1769 CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_CREATE, CTL_EOL); 1770 sysctl_createv(clog, 0, &portalgo_node, NULL, 1771 CTLFLAG_PERMANENT, 1772 CTLTYPE_STRING, "available", 1773 SYSCTL_DESCR("available algorithms"), 1774 sysctl_portalgo_available, 0, NULL, PORTALGO_MAXLEN, 1775 CTL_CREATE, CTL_EOL); 1776 sysctl_createv(clog, 0, &portalgo_node, NULL, 1777 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1778 CTLTYPE_STRING, "selected", 1779 SYSCTL_DESCR("selected algorithm"), 1780 sysctl_portalgo_selected6, 0, NULL, PORTALGO_MAXLEN, 1781 CTL_CREATE, CTL_EOL); 1782 sysctl_createv(clog, 0, &portalgo_node, NULL, 1783 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1784 CTLTYPE_STRUCT, "reserve", 1785 SYSCTL_DESCR("bitmap of reserved ports"), 1786 sysctl_portalgo_reserve6, 0, NULL, 0, 1787 CTL_CREATE, CTL_EOL); 1788 sysctl_createv(clog, 0, NULL, NULL, 1789 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1790 CTLTYPE_INT, "neighborgcthresh", 1791 SYSCTL_DESCR("Maximum number of entries in neighbor" 1792 " cache"), 1793 NULL, 1, &ip6_neighborgcthresh, 0, 1794 CTL_NET, PF_INET6, IPPROTO_IPV6, 1795 CTL_CREATE, CTL_EOL); 1796 sysctl_createv(clog, 0, NULL, NULL, 1797 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1798 CTLTYPE_INT, "maxdynroutes", 1799 SYSCTL_DESCR("Maximum number of routes created via" 1800 " redirect"), 1801 NULL, 1, &ip6_maxdynroutes, 0, 1802 CTL_NET, PF_INET6, IPPROTO_IPV6, 1803 CTL_CREATE, CTL_EOL); 1804 } 1805 1806 void 1807 ip6_statinc(u_int stat) 1808 { 1809 1810 KASSERT(stat < IP6_NSTATS); 1811 IP6_STATINC(stat); 1812 } 1813
Indexes created Mon Sep 22 13:09:51 GMT 2025