1 /*- 2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the project nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $KAME: ip6_input.c,v 1.259 2002/01/21 04:58:09 jinmei Exp $ 30 */ 31 32 /*- 33 * Copyright (c) 1982, 1986, 1988, 1993 34 * The Regents of the University of California. All rights reserved. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 2. Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in the 43 * documentation and/or other materials provided with the distribution. 44 * 4. Neither the name of the University nor the names of its contributors 45 * may be used to endorse or promote products derived from this software 46 * without specific prior written permission. 47 * 48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 58 * SUCH DAMAGE. 59 * 60 * @(#)ip_input.c 8.2 (Berkeley) 1/4/94 61 */ 62 63 #include <sys/cdefs.h> 64 __FBSDID("$FreeBSD$"); 65 66 #include "opt_inet.h" 67 #include "opt_inet6.h" 68 #include "opt_ipfw.h" 69 #include "opt_ipsec.h" 70 #include "opt_route.h" 71 72 #include <sys/param.h> 73 #include <sys/systm.h> 74 #include <sys/malloc.h> 75 #include <sys/mbuf.h> 76 #include <sys/proc.h> 77 #include <sys/domain.h> 78 #include <sys/protosw.h> 79 #include <sys/socket.h> 80 #include <sys/socketvar.h> 81 #include <sys/errno.h> 82 #include <sys/time.h> 83 #include <sys/kernel.h> 84 #include <sys/syslog.h> 85 86 #include <net/if.h> 87 #include <net/if_types.h> 88 #include <net/if_dl.h> 89 #include <net/route.h> 90 #include <net/netisr.h> 91 #include <net/pfil.h> 92 #include <net/vnet.h> 93 94 #include <netinet/in.h> 95 #include <netinet/ip_var.h> 96 #include <netinet/in_systm.h> 97 #include <net/if_llatbl.h> 98 #ifdef INET 99 #include <netinet/ip.h> 100 #include <netinet/ip_icmp.h> 101 #endif /* INET */ 102 #include <netinet/ip6.h> 103 #include <netinet6/in6_var.h> 104 #include <netinet6/ip6_var.h> 105 #include <netinet/in_pcb.h> 106 #include <netinet/icmp6.h> 107 #include <netinet6/scope6_var.h> 108 #include <netinet6/in6_ifattach.h> 109 #include <netinet6/nd6.h> 110 111 #ifdef IPSEC 112 #include <netipsec/ipsec.h> 113 #include <netinet6/ip6_ipsec.h> 114 #include <netipsec/ipsec6.h> 115 #endif /* IPSEC */ 116 117 #include <netinet6/ip6protosw.h> 118 119 #ifdef FLOWTABLE 120 #include <net/flowtable.h> 121 VNET_DECLARE(int, ip6_output_flowtable_size); 122 #define V_ip6_output_flowtable_size VNET(ip6_output_flowtable_size) 123 #endif 124 125 extern struct domain inet6domain; 126 127 u_char ip6_protox[IPPROTO_MAX]; 128 VNET_DEFINE(struct in6_ifaddrhead, in6_ifaddrhead); 129 VNET_DEFINE(struct in6_ifaddrlisthead *, in6_ifaddrhashtbl); 130 VNET_DEFINE(u_long, in6_ifaddrhmask); 131 132 static struct netisr_handler ip6_nh = { 133 .nh_name = "ip6", 134 .nh_handler = ip6_input, 135 .nh_proto = NETISR_IPV6, 136 .nh_policy = NETISR_POLICY_FLOW, 137 }; 138 139 VNET_DECLARE(struct callout, in6_tmpaddrtimer_ch); 140 #define V_in6_tmpaddrtimer_ch VNET(in6_tmpaddrtimer_ch) 141 142 VNET_DEFINE(struct pfil_head, inet6_pfil_hook); 143 144 VNET_DEFINE(struct ip6stat, ip6stat); 145 146 struct rwlock in6_ifaddr_lock; 147 RW_SYSINIT(in6_ifaddr_lock, &in6_ifaddr_lock, "in6_ifaddr_lock"); 148 149 static void ip6_init2(void *); 150 static struct ip6aux *ip6_setdstifaddr(struct mbuf *, struct in6_ifaddr *); 151 static struct ip6aux *ip6_addaux(struct mbuf *); 152 static struct ip6aux *ip6_findaux(struct mbuf *m); 153 static void ip6_delaux (struct mbuf *); 154 static int ip6_hopopts_input(u_int32_t *, u_int32_t *, struct mbuf **, int *); 155 #ifdef PULLDOWN_TEST 156 static struct mbuf *ip6_pullexthdr(struct mbuf *, size_t, int); 157 #endif 158 159 /* 160 * IP6 initialization: fill in IP6 protocol switch table. 161 * All protocols not implemented in kernel go to raw IP6 protocol handler. 162 */ 163 void 164 ip6_init(void) 165 { 166 struct ip6protosw *pr; 167 int i; 168 169 TUNABLE_INT_FETCH("net.inet6.ip6.auto_linklocal", 170 &V_ip6_auto_linklocal); 171 TUNABLE_INT_FETCH("net.inet6.ip6.accept_rtadv", &V_ip6_accept_rtadv); 172 TUNABLE_INT_FETCH("net.inet6.ip6.no_radr", &V_ip6_no_radr); 173 174 TAILQ_INIT(&V_in6_ifaddrhead); 175 V_in6_ifaddrhashtbl = hashinit(IN6ADDR_NHASH, M_IFADDR, 176 &V_in6_ifaddrhmask); 177 178 /* Initialize packet filter hooks. */ 179 V_inet6_pfil_hook.ph_type = PFIL_TYPE_AF; 180 V_inet6_pfil_hook.ph_af = AF_INET6; 181 if ((i = pfil_head_register(&V_inet6_pfil_hook)) != 0) 182 printf("%s: WARNING: unable to register pfil hook, " 183 "error %d\n", __func__, i); 184 185 scope6_init(); 186 addrsel_policy_init(); 187 nd6_init(); 188 frag6_init(); 189 190 #ifdef FLOWTABLE 191 if (TUNABLE_INT_FETCH("net.inet6.ip6.output_flowtable_size", 192 &V_ip6_output_flowtable_size)) { 193 if (V_ip6_output_flowtable_size < 256) 194 V_ip6_output_flowtable_size = 256; 195 if (!powerof2(V_ip6_output_flowtable_size)) { 196 printf("flowtable must be power of 2 size\n"); 197 V_ip6_output_flowtable_size = 2048; 198 } 199 } else { 200 /* 201 * round up to the next power of 2 202 */ 203 V_ip6_output_flowtable_size = 1 << fls((1024 + maxusers * 64)-1); 204 } 205 V_ip6_ft = flowtable_alloc("ipv6", V_ip6_output_flowtable_size, FL_IPV6|FL_PCPU); 206 #endif 207 208 V_ip6_desync_factor = arc4random() % MAX_TEMP_DESYNC_FACTOR; 209 210 /* Skip global initialization stuff for non-default instances. */ 211 if (!IS_DEFAULT_VNET(curvnet)) 212 return; 213 214 #ifdef DIAGNOSTIC 215 if (sizeof(struct protosw) != sizeof(struct ip6protosw)) 216 panic("sizeof(protosw) != sizeof(ip6protosw)"); 217 #endif 218 pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 219 if (pr == NULL) 220 panic("ip6_init"); 221 222 /* Initialize the entire ip6_protox[] array to IPPROTO_RAW. */ 223 for (i = 0; i < IPPROTO_MAX; i++) 224 ip6_protox[i] = pr - inet6sw; 225 /* 226 * Cycle through IP protocols and put them into the appropriate place 227 * in ip6_protox[]. 228 */ 229 for (pr = (struct ip6protosw *)inet6domain.dom_protosw; 230 pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++) 231 if (pr->pr_domain->dom_family == PF_INET6 && 232 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) { 233 /* Be careful to only index valid IP protocols. */ 234 if (pr->pr_protocol < IPPROTO_MAX) 235 ip6_protox[pr->pr_protocol] = pr - inet6sw; 236 } 237 238 netisr_register(&ip6_nh); 239 } 240 241 /* 242 * The protocol to be inserted into ip6_protox[] must be already registered 243 * in inet6sw[], either statically or through pf_proto_register(). 244 */ 245 int 246 ip6proto_register(short ip6proto) 247 { 248 struct ip6protosw *pr; 249 250 /* Sanity checks. */ 251 if (ip6proto <= 0 || ip6proto >= IPPROTO_MAX) 252 return (EPROTONOSUPPORT); 253 254 /* 255 * The protocol slot must not be occupied by another protocol 256 * already. An index pointing to IPPROTO_RAW is unused. 257 */ 258 pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 259 if (pr == NULL) 260 return (EPFNOSUPPORT); 261 if (ip6_protox[ip6proto] != pr - inet6sw) /* IPPROTO_RAW */ 262 return (EEXIST); 263 264 /* 265 * Find the protocol position in inet6sw[] and set the index. 266 */ 267 for (pr = (struct ip6protosw *)inet6domain.dom_protosw; 268 pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++) { 269 if (pr->pr_domain->dom_family == PF_INET6 && 270 pr->pr_protocol && pr->pr_protocol == ip6proto) { 271 ip6_protox[pr->pr_protocol] = pr - inet6sw; 272 return (0); 273 } 274 } 275 return (EPROTONOSUPPORT); 276 } 277 278 int 279 ip6proto_unregister(short ip6proto) 280 { 281 struct ip6protosw *pr; 282 283 /* Sanity checks. */ 284 if (ip6proto <= 0 || ip6proto >= IPPROTO_MAX) 285 return (EPROTONOSUPPORT); 286 287 /* Check if the protocol was indeed registered. */ 288 pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 289 if (pr == NULL) 290 return (EPFNOSUPPORT); 291 if (ip6_protox[ip6proto] == pr - inet6sw) /* IPPROTO_RAW */ 292 return (ENOENT); 293 294 /* Reset the protocol slot to IPPROTO_RAW. */ 295 ip6_protox[ip6proto] = pr - inet6sw; 296 return (0); 297 } 298 299 #ifdef VIMAGE 300 void 301 ip6_destroy() 302 { 303 304 hashdestroy(V_in6_ifaddrhashtbl, M_IFADDR, V_in6_ifaddrhmask); 305 nd6_destroy(); 306 callout_drain(&V_in6_tmpaddrtimer_ch); 307 } 308 #endif 309 310 static int 311 ip6_init2_vnet(const void *unused __unused) 312 { 313 314 /* nd6_timer_init */ 315 callout_init(&V_nd6_timer_ch, 0); 316 callout_reset(&V_nd6_timer_ch, hz, nd6_timer, curvnet); 317 318 /* timer for regeneranation of temporary addresses randomize ID */ 319 callout_init(&V_in6_tmpaddrtimer_ch, 0); 320 callout_reset(&V_in6_tmpaddrtimer_ch, 321 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor - 322 V_ip6_temp_regen_advance) * hz, 323 in6_tmpaddrtimer, curvnet); 324 325 return (0); 326 } 327 328 static void 329 ip6_init2(void *dummy) 330 { 331 332 ip6_init2_vnet(NULL); 333 } 334 335 /* cheat */ 336 /* This must be after route_init(), which is now SI_ORDER_THIRD */ 337 SYSINIT(netinet6init2, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ip6_init2, NULL); 338 339 static int 340 ip6_input_hbh(struct mbuf *m, uint32_t *plen, uint32_t *rtalert, int *off, 341 int *nxt, int *ours) 342 { 343 struct ip6_hdr *ip6; 344 struct ip6_hbh *hbh; 345 346 if (ip6_hopopts_input(plen, rtalert, &m, off)) { 347 #if 0 /*touches NULL pointer*/ 348 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 349 #endif 350 goto out; /* m have already been freed */ 351 } 352 353 /* adjust pointer */ 354 ip6 = mtod(m, struct ip6_hdr *); 355 356 /* 357 * if the payload length field is 0 and the next header field 358 * indicates Hop-by-Hop Options header, then a Jumbo Payload 359 * option MUST be included. 360 */ 361 if (ip6->ip6_plen == 0 && *plen == 0) { 362 /* 363 * Note that if a valid jumbo payload option is 364 * contained, ip6_hopopts_input() must set a valid 365 * (non-zero) payload length to the variable plen. 366 */ 367 IP6STAT_INC(ip6s_badoptions); 368 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 369 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 370 icmp6_error(m, ICMP6_PARAM_PROB, 371 ICMP6_PARAMPROB_HEADER, 372 (caddr_t)&ip6->ip6_plen - (caddr_t)ip6); 373 goto out; 374 } 375 #ifndef PULLDOWN_TEST 376 /* ip6_hopopts_input() ensures that mbuf is contiguous */ 377 hbh = (struct ip6_hbh *)(ip6 + 1); 378 #else 379 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 380 sizeof(struct ip6_hbh)); 381 if (hbh == NULL) { 382 IP6STAT_INC(ip6s_tooshort); 383 goto out; 384 } 385 #endif 386 *nxt = hbh->ip6h_nxt; 387 388 /* 389 * If we are acting as a router and the packet contains a 390 * router alert option, see if we know the option value. 391 * Currently, we only support the option value for MLD, in which 392 * case we should pass the packet to the multicast routing 393 * daemon. 394 */ 395 if (*rtalert != ~0) { 396 switch (*rtalert) { 397 case IP6OPT_RTALERT_MLD: 398 if (V_ip6_forwarding) 399 *ours = 1; 400 break; 401 default: 402 /* 403 * RFC2711 requires unrecognized values must be 404 * silently ignored. 405 */ 406 break; 407 } 408 } 409 410 return (0); 411 412 out: 413 return (1); 414 } 415 416 void 417 ip6_input(struct mbuf *m) 418 { 419 struct ip6_hdr *ip6; 420 int off = sizeof(struct ip6_hdr), nest; 421 u_int32_t plen; 422 u_int32_t rtalert = ~0; 423 int nxt, ours = 0; 424 struct ifnet *deliverifp = NULL, *ifp = NULL; 425 struct in6_addr odst; 426 struct route_in6 rin6; 427 int srcrt = 0; 428 struct llentry *lle = NULL; 429 struct sockaddr_in6 dst6, *dst; 430 431 bzero(&rin6, sizeof(struct route_in6)); 432 #ifdef IPSEC 433 /* 434 * should the inner packet be considered authentic? 435 * see comment in ah4_input(). 436 * NB: m cannot be NULL when passed to the input routine 437 */ 438 439 m->m_flags &= ~M_AUTHIPHDR; 440 m->m_flags &= ~M_AUTHIPDGM; 441 442 #endif /* IPSEC */ 443 444 /* 445 * make sure we don't have onion peering information into m_tag. 446 */ 447 ip6_delaux(m); 448 449 if (m->m_flags & M_FASTFWD_OURS) { 450 /* 451 * Firewall changed destination to local. 452 */ 453 m->m_flags &= ~M_FASTFWD_OURS; 454 ours = 1; 455 deliverifp = m->m_pkthdr.rcvif; 456 ip6 = mtod(m, struct ip6_hdr *); 457 goto hbhcheck; 458 } 459 460 /* 461 * mbuf statistics 462 */ 463 if (m->m_flags & M_EXT) { 464 if (m->m_next) 465 IP6STAT_INC(ip6s_mext2m); 466 else 467 IP6STAT_INC(ip6s_mext1); 468 } else { 469 #define M2MMAX (sizeof(V_ip6stat.ip6s_m2m)/sizeof(V_ip6stat.ip6s_m2m[0])) 470 if (m->m_next) { 471 if (m->m_flags & M_LOOP) { 472 IP6STAT_INC(ip6s_m2m[V_loif->if_index]); 473 } else if (m->m_pkthdr.rcvif->if_index < M2MMAX) 474 IP6STAT_INC( 475 ip6s_m2m[m->m_pkthdr.rcvif->if_index]); 476 else 477 IP6STAT_INC(ip6s_m2m[0]); 478 } else 479 IP6STAT_INC(ip6s_m1); 480 #undef M2MMAX 481 } 482 483 /* drop the packet if IPv6 operation is disabled on the IF */ 484 if ((ND_IFINFO(m->m_pkthdr.rcvif)->flags & ND6_IFF_IFDISABLED)) { 485 m_freem(m); 486 return; 487 } 488 489 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive); 490 IP6STAT_INC(ip6s_total); 491 492 #ifndef PULLDOWN_TEST 493 /* 494 * L2 bridge code and some other code can return mbuf chain 495 * that does not conform to KAME requirement. too bad. 496 * XXX: fails to join if interface MTU > MCLBYTES. jumbogram? 497 */ 498 if (m && m->m_next != NULL && m->m_pkthdr.len < MCLBYTES) { 499 struct mbuf *n; 500 501 if (m->m_pkthdr.len > MHLEN) 502 n = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 503 else 504 n = m_gethdr(M_NOWAIT, MT_DATA); 505 if (n == NULL) { 506 m_freem(m); 507 return; /* ENOBUFS */ 508 } 509 510 m_move_pkthdr(n, m); 511 m_copydata(m, 0, n->m_pkthdr.len, mtod(n, caddr_t)); 512 n->m_len = n->m_pkthdr.len; 513 m_freem(m); 514 m = n; 515 } 516 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), /* nothing */); 517 #endif 518 519 if (m->m_len < sizeof(struct ip6_hdr)) { 520 struct ifnet *inifp; 521 inifp = m->m_pkthdr.rcvif; 522 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 523 IP6STAT_INC(ip6s_toosmall); 524 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 525 return; 526 } 527 } 528 529 ip6 = mtod(m, struct ip6_hdr *); 530 531 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 532 IP6STAT_INC(ip6s_badvers); 533 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 534 goto bad; 535 } 536 537 IP6STAT_INC(ip6s_nxthist[ip6->ip6_nxt]); 538 539 /* 540 * Check against address spoofing/corruption. 541 */ 542 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) || 543 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) { 544 /* 545 * XXX: "badscope" is not very suitable for a multicast source. 546 */ 547 IP6STAT_INC(ip6s_badscope); 548 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 549 goto bad; 550 } 551 if (IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) && 552 !(m->m_flags & M_LOOP)) { 553 /* 554 * In this case, the packet should come from the loopback 555 * interface. However, we cannot just check the if_flags, 556 * because ip6_mloopback() passes the "actual" interface 557 * as the outgoing/incoming interface. 558 */ 559 IP6STAT_INC(ip6s_badscope); 560 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 561 goto bad; 562 } 563 564 #ifdef ALTQ 565 if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) { 566 /* packet is dropped by traffic conditioner */ 567 return; 568 } 569 #endif 570 /* 571 * The following check is not documented in specs. A malicious 572 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack 573 * and bypass security checks (act as if it was from 127.0.0.1 by using 574 * IPv6 src ::ffff:127.0.0.1). Be cautious. 575 * 576 * This check chokes if we are in an SIIT cloud. As none of BSDs 577 * support IPv4-less kernel compilation, we cannot support SIIT 578 * environment at all. So, it makes more sense for us to reject any 579 * malicious packets for non-SIIT environment, than try to do a 580 * partial support for SIIT environment. 581 */ 582 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 583 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 584 IP6STAT_INC(ip6s_badscope); 585 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 586 goto bad; 587 } 588 #if 0 589 /* 590 * Reject packets with IPv4 compatible addresses (auto tunnel). 591 * 592 * The code forbids auto tunnel relay case in RFC1933 (the check is 593 * stronger than RFC1933). We may want to re-enable it if mech-xx 594 * is revised to forbid relaying case. 595 */ 596 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) || 597 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) { 598 IP6STAT_INC(ip6s_badscope); 599 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 600 goto bad; 601 } 602 #endif 603 #ifdef IPSEC 604 /* 605 * Bypass packet filtering for packets previously handled by IPsec. 606 */ 607 if (ip6_ipsec_filtertunnel(m)) 608 goto passin; 609 #endif /* IPSEC */ 610 611 /* 612 * Run through list of hooks for input packets. 613 * 614 * NB: Beware of the destination address changing 615 * (e.g. by NAT rewriting). When this happens, 616 * tell ip6_forward to do the right thing. 617 */ 618 odst = ip6->ip6_dst; 619 620 /* Jump over all PFIL processing if hooks are not active. */ 621 if (!PFIL_HOOKED(&V_inet6_pfil_hook)) 622 goto passin; 623 624 if (pfil_run_hooks(&V_inet6_pfil_hook, &m, 625 m->m_pkthdr.rcvif, PFIL_IN, NULL)) 626 return; 627 if (m == NULL) /* consumed by filter */ 628 return; 629 ip6 = mtod(m, struct ip6_hdr *); 630 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst); 631 632 if (m->m_flags & M_FASTFWD_OURS) { 633 m->m_flags &= ~M_FASTFWD_OURS; 634 ours = 1; 635 deliverifp = m->m_pkthdr.rcvif; 636 goto hbhcheck; 637 } 638 if ((m->m_flags & M_IP6_NEXTHOP) && 639 m_tag_find(m, PACKET_TAG_IPFORWARD, NULL) != NULL) { 640 /* 641 * Directly ship the packet on. This allows forwarding 642 * packets originally destined to us to some other directly 643 * connected host. 644 */ 645 ip6_forward(m, 1); 646 goto out; 647 } 648 649 passin: 650 /* 651 * Disambiguate address scope zones (if there is ambiguity). 652 * We first make sure that the original source or destination address 653 * is not in our internal form for scoped addresses. Such addresses 654 * are not necessarily invalid spec-wise, but we cannot accept them due 655 * to the usage conflict. 656 * in6_setscope() then also checks and rejects the cases where src or 657 * dst are the loopback address and the receiving interface 658 * is not loopback. 659 */ 660 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) { 661 IP6STAT_INC(ip6s_badscope); /* XXX */ 662 goto bad; 663 } 664 if (in6_setscope(&ip6->ip6_src, m->m_pkthdr.rcvif, NULL) || 665 in6_setscope(&ip6->ip6_dst, m->m_pkthdr.rcvif, NULL)) { 666 IP6STAT_INC(ip6s_badscope); 667 goto bad; 668 } 669 670 /* 671 * Multicast check. Assume packet is for us to avoid 672 * prematurely taking locks. 673 */ 674 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 675 ours = 1; 676 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast); 677 deliverifp = m->m_pkthdr.rcvif; 678 goto hbhcheck; 679 } 680 681 /* 682 * Unicast check 683 */ 684 685 bzero(&dst6, sizeof(dst6)); 686 dst6.sin6_family = AF_INET6; 687 dst6.sin6_len = sizeof(struct sockaddr_in6); 688 dst6.sin6_addr = ip6->ip6_dst; 689 ifp = m->m_pkthdr.rcvif; 690 IF_AFDATA_RLOCK(ifp); 691 lle = lla_lookup(LLTABLE6(ifp), 0, 692 (struct sockaddr *)&dst6); 693 IF_AFDATA_RUNLOCK(ifp); 694 if ((lle != NULL) && (lle->la_flags & LLE_IFADDR)) { 695 struct ifaddr *ifa; 696 struct in6_ifaddr *ia6; 697 int bad; 698 699 bad = 1; 700 #define sa_equal(a1, a2) \ 701 (bcmp((a1), (a2), ((a1))->sin6_len) == 0) 702 IF_ADDR_RLOCK(ifp); 703 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 704 if (ifa->ifa_addr->sa_family != dst6.sin6_family) 705 continue; 706 if (sa_equal(&dst6, ifa->ifa_addr)) 707 break; 708 } 709 KASSERT(ifa != NULL, ("%s: ifa not found for lle %p", 710 __func__, lle)); 711 #undef sa_equal 712 713 ia6 = (struct in6_ifaddr *)ifa; 714 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) { 715 /* Count the packet in the ip address stats */ 716 ia6->ia_ifa.if_ipackets++; 717 ia6->ia_ifa.if_ibytes += m->m_pkthdr.len; 718 719 /* 720 * record address information into m_tag. 721 */ 722 (void)ip6_setdstifaddr(m, ia6); 723 724 bad = 0; 725 } else { 726 char ip6bufs[INET6_ADDRSTRLEN]; 727 char ip6bufd[INET6_ADDRSTRLEN]; 728 /* address is not ready, so discard the packet. */ 729 nd6log((LOG_INFO, 730 "ip6_input: packet to an unready address %s->%s\n", 731 ip6_sprintf(ip6bufs, &ip6->ip6_src), 732 ip6_sprintf(ip6bufd, &ip6->ip6_dst))); 733 } 734 IF_ADDR_RUNLOCK(ifp); 735 LLE_RUNLOCK(lle); 736 if (bad) 737 goto bad; 738 else { 739 ours = 1; 740 deliverifp = ifp; 741 goto hbhcheck; 742 } 743 } 744 if (lle != NULL) 745 LLE_RUNLOCK(lle); 746 747 dst = &rin6.ro_dst; 748 dst->sin6_len = sizeof(struct sockaddr_in6); 749 dst->sin6_family = AF_INET6; 750 dst->sin6_addr = ip6->ip6_dst; 751 rin6.ro_rt = in6_rtalloc1((struct sockaddr *)dst, 0, 0, M_GETFIB(m)); 752 if (rin6.ro_rt) 753 RT_UNLOCK(rin6.ro_rt); 754 755 #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key)) 756 757 /* 758 * Accept the packet if the forwarding interface to the destination 759 * according to the routing table is the loopback interface, 760 * unless the associated route has a gateway. 761 * Note that this approach causes to accept a packet if there is a 762 * route to the loopback interface for the destination of the packet. 763 * But we think it's even useful in some situations, e.g. when using 764 * a special daemon which wants to intercept the packet. 765 * 766 * XXX: some OSes automatically make a cloned route for the destination 767 * of an outgoing packet. If the outgoing interface of the packet 768 * is a loopback one, the kernel would consider the packet to be 769 * accepted, even if we have no such address assinged on the interface. 770 * We check the cloned flag of the route entry to reject such cases, 771 * assuming that route entries for our own addresses are not made by 772 * cloning (it should be true because in6_addloop explicitly installs 773 * the host route). However, we might have to do an explicit check 774 * while it would be less efficient. Or, should we rather install a 775 * reject route for such a case? 776 */ 777 if (rin6.ro_rt && 778 (rin6.ro_rt->rt_flags & 779 (RTF_HOST|RTF_GATEWAY)) == RTF_HOST && 780 #ifdef RTF_WASCLONED 781 !(rin6.ro_rt->rt_flags & RTF_WASCLONED) && 782 #endif 783 #ifdef RTF_CLONED 784 !(rin6.ro_rt->rt_flags & RTF_CLONED) && 785 #endif 786 #if 0 787 /* 788 * The check below is redundant since the comparison of 789 * the destination and the key of the rtentry has 790 * already done through looking up the routing table. 791 */ 792 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 793 &rt6_key(rin6.ro_rt)->sin6_addr) 794 #endif 795 rin6.ro_rt->rt_ifp->if_type == IFT_LOOP) { 796 int free_ia6 = 0; 797 struct in6_ifaddr *ia6; 798 799 /* 800 * found the loopback route to the interface address 801 */ 802 if (rin6.ro_rt->rt_gateway->sa_family == AF_LINK) { 803 struct sockaddr_in6 dest6; 804 805 bzero(&dest6, sizeof(dest6)); 806 dest6.sin6_family = AF_INET6; 807 dest6.sin6_len = sizeof(dest6); 808 dest6.sin6_addr = ip6->ip6_dst; 809 ia6 = (struct in6_ifaddr *) 810 ifa_ifwithaddr((struct sockaddr *)&dest6); 811 if (ia6 == NULL) 812 goto bad; 813 free_ia6 = 1; 814 } 815 else 816 ia6 = (struct in6_ifaddr *)rin6.ro_rt->rt_ifa; 817 818 /* 819 * record address information into m_tag. 820 */ 821 (void)ip6_setdstifaddr(m, ia6); 822 823 /* 824 * packets to a tentative, duplicated, or somehow invalid 825 * address must not be accepted. 826 */ 827 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) { 828 /* this address is ready */ 829 ours = 1; 830 deliverifp = ia6->ia_ifp; /* correct? */ 831 /* Count the packet in the ip address stats */ 832 ia6->ia_ifa.if_ipackets++; 833 ia6->ia_ifa.if_ibytes += m->m_pkthdr.len; 834 if (ia6 != NULL && free_ia6 != 0) 835 ifa_free(&ia6->ia_ifa); 836 goto hbhcheck; 837 } else { 838 char ip6bufs[INET6_ADDRSTRLEN]; 839 char ip6bufd[INET6_ADDRSTRLEN]; 840 /* address is not ready, so discard the packet. */ 841 nd6log((LOG_INFO, 842 "ip6_input: packet to an unready address %s->%s\n", 843 ip6_sprintf(ip6bufs, &ip6->ip6_src), 844 ip6_sprintf(ip6bufd, &ip6->ip6_dst))); 845 846 if (ia6 != NULL && free_ia6 != 0) 847 ifa_free(&ia6->ia_ifa); 848 goto bad; 849 } 850 } 851 852 /* 853 * FAITH (Firewall Aided Internet Translator) 854 */ 855 if (V_ip6_keepfaith) { 856 if (rin6.ro_rt && rin6.ro_rt->rt_ifp && 857 rin6.ro_rt->rt_ifp->if_type == IFT_FAITH) { 858 /* XXX do we need more sanity checks? */ 859 ours = 1; 860 deliverifp = rin6.ro_rt->rt_ifp; /* faith */ 861 goto hbhcheck; 862 } 863 } 864 865 /* 866 * Now there is no reason to process the packet if it's not our own 867 * and we're not a router. 868 */ 869 if (!V_ip6_forwarding) { 870 IP6STAT_INC(ip6s_cantforward); 871 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 872 goto bad; 873 } 874 875 hbhcheck: 876 /* 877 * record address information into m_tag, if we don't have one yet. 878 * note that we are unable to record it, if the address is not listed 879 * as our interface address (e.g. multicast addresses, addresses 880 * within FAITH prefixes and such). 881 */ 882 if (deliverifp) { 883 struct in6_ifaddr *ia6; 884 885 if ((ia6 = ip6_getdstifaddr(m)) != NULL) { 886 ifa_free(&ia6->ia_ifa); 887 } else { 888 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 889 if (ia6) { 890 if (!ip6_setdstifaddr(m, ia6)) { 891 /* 892 * XXX maybe we should drop the packet here, 893 * as we could not provide enough information 894 * to the upper layers. 895 */ 896 } 897 ifa_free(&ia6->ia_ifa); 898 } 899 } 900 } 901 902 /* 903 * Process Hop-by-Hop options header if it's contained. 904 * m may be modified in ip6_hopopts_input(). 905 * If a JumboPayload option is included, plen will also be modified. 906 */ 907 plen = (u_int32_t)ntohs(ip6->ip6_plen); 908 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 909 int error; 910 911 error = ip6_input_hbh(m, &plen, &rtalert, &off, &nxt, &ours); 912 if (error != 0) 913 goto out; 914 } else 915 nxt = ip6->ip6_nxt; 916 917 /* 918 * Check that the amount of data in the buffers 919 * is as at least much as the IPv6 header would have us expect. 920 * Trim mbufs if longer than we expect. 921 * Drop packet if shorter than we expect. 922 */ 923 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 924 IP6STAT_INC(ip6s_tooshort); 925 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 926 goto bad; 927 } 928 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 929 if (m->m_len == m->m_pkthdr.len) { 930 m->m_len = sizeof(struct ip6_hdr) + plen; 931 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 932 } else 933 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 934 } 935 936 /* 937 * Forward if desirable. 938 */ 939 if (V_ip6_mrouter && 940 IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 941 /* 942 * If we are acting as a multicast router, all 943 * incoming multicast packets are passed to the 944 * kernel-level multicast forwarding function. 945 * The packet is returned (relatively) intact; if 946 * ip6_mforward() returns a non-zero value, the packet 947 * must be discarded, else it may be accepted below. 948 * 949 * XXX TODO: Check hlim and multicast scope here to avoid 950 * unnecessarily calling into ip6_mforward(). 951 */ 952 if (ip6_mforward && 953 ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) { 954 IP6STAT_INC(ip6s_cantforward); 955 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 956 goto bad; 957 } 958 } else if (!ours) { 959 ip6_forward(m, srcrt); 960 goto out; 961 } 962 963 ip6 = mtod(m, struct ip6_hdr *); 964 965 /* 966 * Malicious party may be able to use IPv4 mapped addr to confuse 967 * tcp/udp stack and bypass security checks (act as if it was from 968 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious. 969 * 970 * For SIIT end node behavior, you may want to disable the check. 971 * However, you will become vulnerable to attacks using IPv4 mapped 972 * source. 973 */ 974 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 975 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 976 IP6STAT_INC(ip6s_badscope); 977 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 978 goto bad; 979 } 980 981 /* 982 * Tell launch routine the next header 983 */ 984 IP6STAT_INC(ip6s_delivered); 985 in6_ifstat_inc(deliverifp, ifs6_in_deliver); 986 nest = 0; 987 988 while (nxt != IPPROTO_DONE) { 989 if (V_ip6_hdrnestlimit && (++nest > V_ip6_hdrnestlimit)) { 990 IP6STAT_INC(ip6s_toomanyhdr); 991 goto bad; 992 } 993 994 /* 995 * protection against faulty packet - there should be 996 * more sanity checks in header chain processing. 997 */ 998 if (m->m_pkthdr.len < off) { 999 IP6STAT_INC(ip6s_tooshort); 1000 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 1001 goto bad; 1002 } 1003 1004 #ifdef IPSEC 1005 /* 1006 * enforce IPsec policy checking if we are seeing last header. 1007 * note that we do not visit this with protocols with pcb layer 1008 * code - like udp/tcp/raw ip. 1009 */ 1010 if (ip6_ipsec_input(m, nxt)) 1011 goto bad; 1012 #endif /* IPSEC */ 1013 1014 /* 1015 * Use mbuf flags to propagate Router Alert option to 1016 * ICMPv6 layer, as hop-by-hop options have been stripped. 1017 */ 1018 if (nxt == IPPROTO_ICMPV6 && rtalert != ~0) 1019 m->m_flags |= M_RTALERT_MLD; 1020 1021 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt); 1022 } 1023 goto out; 1024 bad: 1025 m_freem(m); 1026 out: 1027 if (rin6.ro_rt) 1028 RTFREE(rin6.ro_rt); 1029 } 1030 1031 /* 1032 * set/grab in6_ifaddr correspond to IPv6 destination address. 1033 * XXX backward compatibility wrapper 1034 * 1035 * XXXRW: We should bump the refcount on ia6 before sticking it in the m_tag, 1036 * and then bump it when the tag is copied, and release it when the tag is 1037 * freed. Unfortunately, m_tags don't support deep copies (yet), so instead 1038 * we just bump the ia refcount when we receive it. This should be fixed. 1039 */ 1040 static struct ip6aux * 1041 ip6_setdstifaddr(struct mbuf *m, struct in6_ifaddr *ia6) 1042 { 1043 struct ip6aux *ip6a; 1044 1045 ip6a = ip6_addaux(m); 1046 if (ip6a) 1047 ip6a->ip6a_dstia6 = ia6; 1048 return ip6a; /* NULL if failed to set */ 1049 } 1050 1051 struct in6_ifaddr * 1052 ip6_getdstifaddr(struct mbuf *m) 1053 { 1054 struct ip6aux *ip6a; 1055 struct in6_ifaddr *ia; 1056 1057 ip6a = ip6_findaux(m); 1058 if (ip6a) { 1059 ia = ip6a->ip6a_dstia6; 1060 ifa_ref(&ia->ia_ifa); 1061 return ia; 1062 } else 1063 return NULL; 1064 } 1065 1066 /* 1067 * Hop-by-Hop options header processing. If a valid jumbo payload option is 1068 * included, the real payload length will be stored in plenp. 1069 * 1070 * rtalertp - XXX: should be stored more smart way 1071 */ 1072 static int 1073 ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp, 1074 struct mbuf **mp, int *offp) 1075 { 1076 struct mbuf *m = *mp; 1077 int off = *offp, hbhlen; 1078 struct ip6_hbh *hbh; 1079 u_int8_t *opt; 1080 1081 /* validation of the length of the header */ 1082 #ifndef PULLDOWN_TEST 1083 IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1); 1084 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); 1085 hbhlen = (hbh->ip6h_len + 1) << 3; 1086 1087 IP6_EXTHDR_CHECK(m, off, hbhlen, -1); 1088 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); 1089 #else 1090 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, 1091 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh)); 1092 if (hbh == NULL) { 1093 IP6STAT_INC(ip6s_tooshort); 1094 return -1; 1095 } 1096 hbhlen = (hbh->ip6h_len + 1) << 3; 1097 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 1098 hbhlen); 1099 if (hbh == NULL) { 1100 IP6STAT_INC(ip6s_tooshort); 1101 return -1; 1102 } 1103 #endif 1104 off += hbhlen; 1105 hbhlen -= sizeof(struct ip6_hbh); 1106 opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh); 1107 1108 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 1109 hbhlen, rtalertp, plenp) < 0) 1110 return (-1); 1111 1112 *offp = off; 1113 *mp = m; 1114 return (0); 1115 } 1116 1117 /* 1118 * Search header for all Hop-by-hop options and process each option. 1119 * This function is separate from ip6_hopopts_input() in order to 1120 * handle a case where the sending node itself process its hop-by-hop 1121 * options header. In such a case, the function is called from ip6_output(). 1122 * 1123 * The function assumes that hbh header is located right after the IPv6 header 1124 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to 1125 * opthead + hbhlen is located in contiguous memory region. 1126 */ 1127 int 1128 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen, 1129 u_int32_t *rtalertp, u_int32_t *plenp) 1130 { 1131 struct ip6_hdr *ip6; 1132 int optlen = 0; 1133 u_int8_t *opt = opthead; 1134 u_int16_t rtalert_val; 1135 u_int32_t jumboplen; 1136 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh); 1137 1138 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 1139 switch (*opt) { 1140 case IP6OPT_PAD1: 1141 optlen = 1; 1142 break; 1143 case IP6OPT_PADN: 1144 if (hbhlen < IP6OPT_MINLEN) { 1145 IP6STAT_INC(ip6s_toosmall); 1146 goto bad; 1147 } 1148 optlen = *(opt + 1) + 2; 1149 break; 1150 case IP6OPT_ROUTER_ALERT: 1151 /* XXX may need check for alignment */ 1152 if (hbhlen < IP6OPT_RTALERT_LEN) { 1153 IP6STAT_INC(ip6s_toosmall); 1154 goto bad; 1155 } 1156 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) { 1157 /* XXX stat */ 1158 icmp6_error(m, ICMP6_PARAM_PROB, 1159 ICMP6_PARAMPROB_HEADER, 1160 erroff + opt + 1 - opthead); 1161 return (-1); 1162 } 1163 optlen = IP6OPT_RTALERT_LEN; 1164 bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2); 1165 *rtalertp = ntohs(rtalert_val); 1166 break; 1167 case IP6OPT_JUMBO: 1168 /* XXX may need check for alignment */ 1169 if (hbhlen < IP6OPT_JUMBO_LEN) { 1170 IP6STAT_INC(ip6s_toosmall); 1171 goto bad; 1172 } 1173 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) { 1174 /* XXX stat */ 1175 icmp6_error(m, ICMP6_PARAM_PROB, 1176 ICMP6_PARAMPROB_HEADER, 1177 erroff + opt + 1 - opthead); 1178 return (-1); 1179 } 1180 optlen = IP6OPT_JUMBO_LEN; 1181 1182 /* 1183 * IPv6 packets that have non 0 payload length 1184 * must not contain a jumbo payload option. 1185 */ 1186 ip6 = mtod(m, struct ip6_hdr *); 1187 if (ip6->ip6_plen) { 1188 IP6STAT_INC(ip6s_badoptions); 1189 icmp6_error(m, ICMP6_PARAM_PROB, 1190 ICMP6_PARAMPROB_HEADER, 1191 erroff + opt - opthead); 1192 return (-1); 1193 } 1194 1195 /* 1196 * We may see jumbolen in unaligned location, so 1197 * we'd need to perform bcopy(). 1198 */ 1199 bcopy(opt + 2, &jumboplen, sizeof(jumboplen)); 1200 jumboplen = (u_int32_t)htonl(jumboplen); 1201 1202 #if 1 1203 /* 1204 * if there are multiple jumbo payload options, 1205 * *plenp will be non-zero and the packet will be 1206 * rejected. 1207 * the behavior may need some debate in ipngwg - 1208 * multiple options does not make sense, however, 1209 * there's no explicit mention in specification. 1210 */ 1211 if (*plenp != 0) { 1212 IP6STAT_INC(ip6s_badoptions); 1213 icmp6_error(m, ICMP6_PARAM_PROB, 1214 ICMP6_PARAMPROB_HEADER, 1215 erroff + opt + 2 - opthead); 1216 return (-1); 1217 } 1218 #endif 1219 1220 /* 1221 * jumbo payload length must be larger than 65535. 1222 */ 1223 if (jumboplen <= IPV6_MAXPACKET) { 1224 IP6STAT_INC(ip6s_badoptions); 1225 icmp6_error(m, ICMP6_PARAM_PROB, 1226 ICMP6_PARAMPROB_HEADER, 1227 erroff + opt + 2 - opthead); 1228 return (-1); 1229 } 1230 *plenp = jumboplen; 1231 1232 break; 1233 default: /* unknown option */ 1234 if (hbhlen < IP6OPT_MINLEN) { 1235 IP6STAT_INC(ip6s_toosmall); 1236 goto bad; 1237 } 1238 optlen = ip6_unknown_opt(opt, m, 1239 erroff + opt - opthead); 1240 if (optlen == -1) 1241 return (-1); 1242 optlen += 2; 1243 break; 1244 } 1245 } 1246 1247 return (0); 1248 1249 bad: 1250 m_freem(m); 1251 return (-1); 1252 } 1253 1254 /* 1255 * Unknown option processing. 1256 * The third argument `off' is the offset from the IPv6 header to the option, 1257 * which is necessary if the IPv6 header the and option header and IPv6 header 1258 * is not contiguous in order to return an ICMPv6 error. 1259 */ 1260 int 1261 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off) 1262 { 1263 struct ip6_hdr *ip6; 1264 1265 switch (IP6OPT_TYPE(*optp)) { 1266 case IP6OPT_TYPE_SKIP: /* ignore the option */ 1267 return ((int)*(optp + 1)); 1268 case IP6OPT_TYPE_DISCARD: /* silently discard */ 1269 m_freem(m); 1270 return (-1); 1271 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 1272 IP6STAT_INC(ip6s_badoptions); 1273 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 1274 return (-1); 1275 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 1276 IP6STAT_INC(ip6s_badoptions); 1277 ip6 = mtod(m, struct ip6_hdr *); 1278 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 1279 (m->m_flags & (M_BCAST|M_MCAST))) 1280 m_freem(m); 1281 else 1282 icmp6_error(m, ICMP6_PARAM_PROB, 1283 ICMP6_PARAMPROB_OPTION, off); 1284 return (-1); 1285 } 1286 1287 m_freem(m); /* XXX: NOTREACHED */ 1288 return (-1); 1289 } 1290 1291 /* 1292 * Create the "control" list for this pcb. 1293 * These functions will not modify mbuf chain at all. 1294 * 1295 * With KAME mbuf chain restriction: 1296 * The routine will be called from upper layer handlers like tcp6_input(). 1297 * Thus the routine assumes that the caller (tcp6_input) have already 1298 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the 1299 * very first mbuf on the mbuf chain. 1300 * 1301 * ip6_savecontrol_v4 will handle those options that are possible to be 1302 * set on a v4-mapped socket. 1303 * ip6_savecontrol will directly call ip6_savecontrol_v4 to handle those 1304 * options and handle the v6-only ones itself. 1305 */ 1306 struct mbuf ** 1307 ip6_savecontrol_v4(struct inpcb *inp, struct mbuf *m, struct mbuf **mp, 1308 int *v4only) 1309 { 1310 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1311 1312 #ifdef SO_TIMESTAMP 1313 if ((inp->inp_socket->so_options & SO_TIMESTAMP) != 0) { 1314 struct timeval tv; 1315 1316 microtime(&tv); 1317 *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv), 1318 SCM_TIMESTAMP, SOL_SOCKET); 1319 if (*mp) 1320 mp = &(*mp)->m_next; 1321 } 1322 #endif 1323 1324 #define IS2292(inp, x, y) (((inp)->inp_flags & IN6P_RFC2292) ? (x) : (y)) 1325 /* RFC 2292 sec. 5 */ 1326 if ((inp->inp_flags & IN6P_PKTINFO) != 0) { 1327 struct in6_pktinfo pi6; 1328 1329 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1330 #ifdef INET 1331 struct ip *ip; 1332 1333 ip = mtod(m, struct ip *); 1334 pi6.ipi6_addr.s6_addr32[0] = 0; 1335 pi6.ipi6_addr.s6_addr32[1] = 0; 1336 pi6.ipi6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP; 1337 pi6.ipi6_addr.s6_addr32[3] = ip->ip_dst.s_addr; 1338 #else 1339 /* We won't hit this code */ 1340 bzero(&pi6.ipi6_addr, sizeof(struct in6_addr)); 1341 #endif 1342 } else { 1343 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr)); 1344 in6_clearscope(&pi6.ipi6_addr); /* XXX */ 1345 } 1346 pi6.ipi6_ifindex = 1347 (m && m->m_pkthdr.rcvif) ? m->m_pkthdr.rcvif->if_index : 0; 1348 1349 *mp = sbcreatecontrol((caddr_t) &pi6, 1350 sizeof(struct in6_pktinfo), 1351 IS2292(inp, IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6); 1352 if (*mp) 1353 mp = &(*mp)->m_next; 1354 } 1355 1356 if ((inp->inp_flags & IN6P_HOPLIMIT) != 0) { 1357 int hlim; 1358 1359 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1360 #ifdef INET 1361 struct ip *ip; 1362 1363 ip = mtod(m, struct ip *); 1364 hlim = ip->ip_ttl; 1365 #else 1366 /* We won't hit this code */ 1367 hlim = 0; 1368 #endif 1369 } else { 1370 hlim = ip6->ip6_hlim & 0xff; 1371 } 1372 *mp = sbcreatecontrol((caddr_t) &hlim, sizeof(int), 1373 IS2292(inp, IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), 1374 IPPROTO_IPV6); 1375 if (*mp) 1376 mp = &(*mp)->m_next; 1377 } 1378 1379 if ((inp->inp_flags & IN6P_TCLASS) != 0) { 1380 int tclass; 1381 1382 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1383 #ifdef INET 1384 struct ip *ip; 1385 1386 ip = mtod(m, struct ip *); 1387 tclass = ip->ip_tos; 1388 #else 1389 /* We won't hit this code */ 1390 tclass = 0; 1391 #endif 1392 } else { 1393 u_int32_t flowinfo; 1394 1395 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK); 1396 flowinfo >>= 20; 1397 tclass = flowinfo & 0xff; 1398 } 1399 *mp = sbcreatecontrol((caddr_t) &tclass, sizeof(int), 1400 IPV6_TCLASS, IPPROTO_IPV6); 1401 if (*mp) 1402 mp = &(*mp)->m_next; 1403 } 1404 1405 if (v4only != NULL) { 1406 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1407 *v4only = 1; 1408 } else { 1409 *v4only = 0; 1410 } 1411 } 1412 1413 return (mp); 1414 } 1415 1416 void 1417 ip6_savecontrol(struct inpcb *in6p, struct mbuf *m, struct mbuf **mp) 1418 { 1419 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1420 int v4only = 0; 1421 1422 mp = ip6_savecontrol_v4(in6p, m, mp, &v4only); 1423 if (v4only) 1424 return; 1425 1426 /* 1427 * IPV6_HOPOPTS socket option. Recall that we required super-user 1428 * privilege for the option (see ip6_ctloutput), but it might be too 1429 * strict, since there might be some hop-by-hop options which can be 1430 * returned to normal user. 1431 * See also RFC 2292 section 6 (or RFC 3542 section 8). 1432 */ 1433 if ((in6p->inp_flags & IN6P_HOPOPTS) != 0) { 1434 /* 1435 * Check if a hop-by-hop options header is contatined in the 1436 * received packet, and if so, store the options as ancillary 1437 * data. Note that a hop-by-hop options header must be 1438 * just after the IPv6 header, which is assured through the 1439 * IPv6 input processing. 1440 */ 1441 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 1442 struct ip6_hbh *hbh; 1443 int hbhlen = 0; 1444 #ifdef PULLDOWN_TEST 1445 struct mbuf *ext; 1446 #endif 1447 1448 #ifndef PULLDOWN_TEST 1449 hbh = (struct ip6_hbh *)(ip6 + 1); 1450 hbhlen = (hbh->ip6h_len + 1) << 3; 1451 #else 1452 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr), 1453 ip6->ip6_nxt); 1454 if (ext == NULL) { 1455 IP6STAT_INC(ip6s_tooshort); 1456 return; 1457 } 1458 hbh = mtod(ext, struct ip6_hbh *); 1459 hbhlen = (hbh->ip6h_len + 1) << 3; 1460 if (hbhlen != ext->m_len) { 1461 m_freem(ext); 1462 IP6STAT_INC(ip6s_tooshort); 1463 return; 1464 } 1465 #endif 1466 1467 /* 1468 * XXX: We copy the whole header even if a 1469 * jumbo payload option is included, the option which 1470 * is to be removed before returning according to 1471 * RFC2292. 1472 * Note: this constraint is removed in RFC3542 1473 */ 1474 *mp = sbcreatecontrol((caddr_t)hbh, hbhlen, 1475 IS2292(in6p, IPV6_2292HOPOPTS, IPV6_HOPOPTS), 1476 IPPROTO_IPV6); 1477 if (*mp) 1478 mp = &(*mp)->m_next; 1479 #ifdef PULLDOWN_TEST 1480 m_freem(ext); 1481 #endif 1482 } 1483 } 1484 1485 if ((in6p->inp_flags & (IN6P_RTHDR | IN6P_DSTOPTS)) != 0) { 1486 int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr); 1487 1488 /* 1489 * Search for destination options headers or routing 1490 * header(s) through the header chain, and stores each 1491 * header as ancillary data. 1492 * Note that the order of the headers remains in 1493 * the chain of ancillary data. 1494 */ 1495 while (1) { /* is explicit loop prevention necessary? */ 1496 struct ip6_ext *ip6e = NULL; 1497 int elen; 1498 #ifdef PULLDOWN_TEST 1499 struct mbuf *ext = NULL; 1500 #endif 1501 1502 /* 1503 * if it is not an extension header, don't try to 1504 * pull it from the chain. 1505 */ 1506 switch (nxt) { 1507 case IPPROTO_DSTOPTS: 1508 case IPPROTO_ROUTING: 1509 case IPPROTO_HOPOPTS: 1510 case IPPROTO_AH: /* is it possible? */ 1511 break; 1512 default: 1513 goto loopend; 1514 } 1515 1516 #ifndef PULLDOWN_TEST 1517 if (off + sizeof(*ip6e) > m->m_len) 1518 goto loopend; 1519 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off); 1520 if (nxt == IPPROTO_AH) 1521 elen = (ip6e->ip6e_len + 2) << 2; 1522 else 1523 elen = (ip6e->ip6e_len + 1) << 3; 1524 if (off + elen > m->m_len) 1525 goto loopend; 1526 #else 1527 ext = ip6_pullexthdr(m, off, nxt); 1528 if (ext == NULL) { 1529 IP6STAT_INC(ip6s_tooshort); 1530 return; 1531 } 1532 ip6e = mtod(ext, struct ip6_ext *); 1533 if (nxt == IPPROTO_AH) 1534 elen = (ip6e->ip6e_len + 2) << 2; 1535 else 1536 elen = (ip6e->ip6e_len + 1) << 3; 1537 if (elen != ext->m_len) { 1538 m_freem(ext); 1539 IP6STAT_INC(ip6s_tooshort); 1540 return; 1541 } 1542 #endif 1543 1544 switch (nxt) { 1545 case IPPROTO_DSTOPTS: 1546 if (!(in6p->inp_flags & IN6P_DSTOPTS)) 1547 break; 1548 1549 *mp = sbcreatecontrol((caddr_t)ip6e, elen, 1550 IS2292(in6p, 1551 IPV6_2292DSTOPTS, IPV6_DSTOPTS), 1552 IPPROTO_IPV6); 1553 if (*mp) 1554 mp = &(*mp)->m_next; 1555 break; 1556 case IPPROTO_ROUTING: 1557 if (!(in6p->inp_flags & IN6P_RTHDR)) 1558 break; 1559 1560 *mp = sbcreatecontrol((caddr_t)ip6e, elen, 1561 IS2292(in6p, IPV6_2292RTHDR, IPV6_RTHDR), 1562 IPPROTO_IPV6); 1563 if (*mp) 1564 mp = &(*mp)->m_next; 1565 break; 1566 case IPPROTO_HOPOPTS: 1567 case IPPROTO_AH: /* is it possible? */ 1568 break; 1569 1570 default: 1571 /* 1572 * other cases have been filtered in the above. 1573 * none will visit this case. here we supply 1574 * the code just in case (nxt overwritten or 1575 * other cases). 1576 */ 1577 #ifdef PULLDOWN_TEST 1578 m_freem(ext); 1579 #endif 1580 goto loopend; 1581 1582 } 1583 1584 /* proceed with the next header. */ 1585 off += elen; 1586 nxt = ip6e->ip6e_nxt; 1587 ip6e = NULL; 1588 #ifdef PULLDOWN_TEST 1589 m_freem(ext); 1590 ext = NULL; 1591 #endif 1592 } 1593 loopend: 1594 ; 1595 } 1596 } 1597 #undef IS2292 1598 1599 void 1600 ip6_notify_pmtu(struct inpcb *in6p, struct sockaddr_in6 *dst, u_int32_t *mtu) 1601 { 1602 struct socket *so; 1603 struct mbuf *m_mtu; 1604 struct ip6_mtuinfo mtuctl; 1605 1606 so = in6p->inp_socket; 1607 1608 if (mtu == NULL) 1609 return; 1610 1611 #ifdef DIAGNOSTIC 1612 if (so == NULL) /* I believe this is impossible */ 1613 panic("ip6_notify_pmtu: socket is NULL"); 1614 #endif 1615 1616 bzero(&mtuctl, sizeof(mtuctl)); /* zero-clear for safety */ 1617 mtuctl.ip6m_mtu = *mtu; 1618 mtuctl.ip6m_addr = *dst; 1619 if (sa6_recoverscope(&mtuctl.ip6m_addr)) 1620 return; 1621 1622 if ((m_mtu = sbcreatecontrol((caddr_t)&mtuctl, sizeof(mtuctl), 1623 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL) 1624 return; 1625 1626 if (sbappendaddr(&so->so_rcv, (struct sockaddr *)dst, NULL, m_mtu) 1627 == 0) { 1628 m_freem(m_mtu); 1629 /* XXX: should count statistics */ 1630 } else 1631 sorwakeup(so); 1632 1633 return; 1634 } 1635 1636 #ifdef PULLDOWN_TEST 1637 /* 1638 * pull single extension header from mbuf chain. returns single mbuf that 1639 * contains the result, or NULL on error. 1640 */ 1641 static struct mbuf * 1642 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt) 1643 { 1644 struct ip6_ext ip6e; 1645 size_t elen; 1646 struct mbuf *n; 1647 1648 #ifdef DIAGNOSTIC 1649 switch (nxt) { 1650 case IPPROTO_DSTOPTS: 1651 case IPPROTO_ROUTING: 1652 case IPPROTO_HOPOPTS: 1653 case IPPROTO_AH: /* is it possible? */ 1654 break; 1655 default: 1656 printf("ip6_pullexthdr: invalid nxt=%d\n", nxt); 1657 } 1658 #endif 1659 1660 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1661 if (nxt == IPPROTO_AH) 1662 elen = (ip6e.ip6e_len + 2) << 2; 1663 else 1664 elen = (ip6e.ip6e_len + 1) << 3; 1665 1666 if (elen > MLEN) 1667 n = m_getcl(M_NOWAIT, MT_DATA, 0); 1668 else 1669 n = m_get(M_NOWAIT, MT_DATA); 1670 if (n == NULL) 1671 return NULL; 1672 1673 m_copydata(m, off, elen, mtod(n, caddr_t)); 1674 n->m_len = elen; 1675 return n; 1676 } 1677 #endif 1678 1679 /* 1680 * Get pointer to the previous header followed by the header 1681 * currently processed. 1682 * XXX: This function supposes that 1683 * M includes all headers, 1684 * the next header field and the header length field of each header 1685 * are valid, and 1686 * the sum of each header length equals to OFF. 1687 * Because of these assumptions, this function must be called very 1688 * carefully. Moreover, it will not be used in the near future when 1689 * we develop `neater' mechanism to process extension headers. 1690 */ 1691 char * 1692 ip6_get_prevhdr(struct mbuf *m, int off) 1693 { 1694 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1695 1696 if (off == sizeof(struct ip6_hdr)) 1697 return (&ip6->ip6_nxt); 1698 else { 1699 int len, nxt; 1700 struct ip6_ext *ip6e = NULL; 1701 1702 nxt = ip6->ip6_nxt; 1703 len = sizeof(struct ip6_hdr); 1704 while (len < off) { 1705 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len); 1706 1707 switch (nxt) { 1708 case IPPROTO_FRAGMENT: 1709 len += sizeof(struct ip6_frag); 1710 break; 1711 case IPPROTO_AH: 1712 len += (ip6e->ip6e_len + 2) << 2; 1713 break; 1714 default: 1715 len += (ip6e->ip6e_len + 1) << 3; 1716 break; 1717 } 1718 nxt = ip6e->ip6e_nxt; 1719 } 1720 if (ip6e) 1721 return (&ip6e->ip6e_nxt); 1722 else 1723 return NULL; 1724 } 1725 } 1726 1727 /* 1728 * get next header offset. m will be retained. 1729 */ 1730 int 1731 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp) 1732 { 1733 struct ip6_hdr ip6; 1734 struct ip6_ext ip6e; 1735 struct ip6_frag fh; 1736 1737 /* just in case */ 1738 if (m == NULL) 1739 panic("ip6_nexthdr: m == NULL"); 1740 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off) 1741 return -1; 1742 1743 switch (proto) { 1744 case IPPROTO_IPV6: 1745 if (m->m_pkthdr.len < off + sizeof(ip6)) 1746 return -1; 1747 m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6); 1748 if (nxtp) 1749 *nxtp = ip6.ip6_nxt; 1750 off += sizeof(ip6); 1751 return off; 1752 1753 case IPPROTO_FRAGMENT: 1754 /* 1755 * terminate parsing if it is not the first fragment, 1756 * it does not make sense to parse through it. 1757 */ 1758 if (m->m_pkthdr.len < off + sizeof(fh)) 1759 return -1; 1760 m_copydata(m, off, sizeof(fh), (caddr_t)&fh); 1761 /* IP6F_OFF_MASK = 0xfff8(BigEndian), 0xf8ff(LittleEndian) */ 1762 if (fh.ip6f_offlg & IP6F_OFF_MASK) 1763 return -1; 1764 if (nxtp) 1765 *nxtp = fh.ip6f_nxt; 1766 off += sizeof(struct ip6_frag); 1767 return off; 1768 1769 case IPPROTO_AH: 1770 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1771 return -1; 1772 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1773 if (nxtp) 1774 *nxtp = ip6e.ip6e_nxt; 1775 off += (ip6e.ip6e_len + 2) << 2; 1776 return off; 1777 1778 case IPPROTO_HOPOPTS: 1779 case IPPROTO_ROUTING: 1780 case IPPROTO_DSTOPTS: 1781 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1782 return -1; 1783 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1784 if (nxtp) 1785 *nxtp = ip6e.ip6e_nxt; 1786 off += (ip6e.ip6e_len + 1) << 3; 1787 return off; 1788 1789 case IPPROTO_NONE: 1790 case IPPROTO_ESP: 1791 case IPPROTO_IPCOMP: 1792 /* give up */ 1793 return -1; 1794 1795 default: 1796 return -1; 1797 } 1798 1799 return -1; 1800 } 1801 1802 /* 1803 * get offset for the last header in the chain. m will be kept untainted. 1804 */ 1805 int 1806 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp) 1807 { 1808 int newoff; 1809 int nxt; 1810 1811 if (!nxtp) { 1812 nxt = -1; 1813 nxtp = &nxt; 1814 } 1815 while (1) { 1816 newoff = ip6_nexthdr(m, off, proto, nxtp); 1817 if (newoff < 0) 1818 return off; 1819 else if (newoff < off) 1820 return -1; /* invalid */ 1821 else if (newoff == off) 1822 return newoff; 1823 1824 off = newoff; 1825 proto = *nxtp; 1826 } 1827 } 1828 1829 static struct ip6aux * 1830 ip6_addaux(struct mbuf *m) 1831 { 1832 struct m_tag *mtag; 1833 1834 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL); 1835 if (!mtag) { 1836 mtag = m_tag_get(PACKET_TAG_IPV6_INPUT, sizeof(struct ip6aux), 1837 M_NOWAIT); 1838 if (mtag) { 1839 m_tag_prepend(m, mtag); 1840 bzero(mtag + 1, sizeof(struct ip6aux)); 1841 } 1842 } 1843 return mtag ? (struct ip6aux *)(mtag + 1) : NULL; 1844 } 1845 1846 static struct ip6aux * 1847 ip6_findaux(struct mbuf *m) 1848 { 1849 struct m_tag *mtag; 1850 1851 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL); 1852 return mtag ? (struct ip6aux *)(mtag + 1) : NULL; 1853 } 1854 1855 static void 1856 ip6_delaux(struct mbuf *m) 1857 { 1858 struct m_tag *mtag; 1859 1860 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL); 1861 if (mtag) 1862 m_tag_delete(m, mtag); 1863 } 1864 1865 /* 1866 * System control for IP6 1867 */ 1868 1869 u_char inet6ctlerrmap[PRC_NCMDS] = { 1870 0, 0, 0, 0, 1871 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 1872 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 1873 EMSGSIZE, EHOSTUNREACH, 0, 0, 1874 0, 0, 0, 0, 1875 ENOPROTOOPT 1876 }; 1877