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_PCPUSTAT_DEFINE(struct ip6stat, ip6stat); 145 VNET_PCPUSTAT_SYSINIT(ip6stat); 146 #ifdef VIMAGE 147 VNET_PCPUSTAT_SYSUNINIT(ip6stat); 148 #endif /* VIMAGE */ 149 150 struct rwlock in6_ifaddr_lock; 151 RW_SYSINIT(in6_ifaddr_lock, &in6_ifaddr_lock, "in6_ifaddr_lock"); 152 153 static void ip6_init2(void *); 154 static struct ip6aux *ip6_setdstifaddr(struct mbuf *, struct in6_ifaddr *); 155 static struct ip6aux *ip6_addaux(struct mbuf *); 156 static struct ip6aux *ip6_findaux(struct mbuf *m); 157 static void ip6_delaux (struct mbuf *); 158 static int ip6_hopopts_input(u_int32_t *, u_int32_t *, struct mbuf **, int *); 159 #ifdef PULLDOWN_TEST 160 static struct mbuf *ip6_pullexthdr(struct mbuf *, size_t, int); 161 #endif 162 163 /* 164 * IP6 initialization: fill in IP6 protocol switch table. 165 * All protocols not implemented in kernel go to raw IP6 protocol handler. 166 */ 167 void 168 ip6_init(void) 169 { 170 struct ip6protosw *pr; 171 int i; 172 173 TUNABLE_INT_FETCH("net.inet6.ip6.auto_linklocal", 174 &V_ip6_auto_linklocal); 175 TUNABLE_INT_FETCH("net.inet6.ip6.accept_rtadv", &V_ip6_accept_rtadv); 176 TUNABLE_INT_FETCH("net.inet6.ip6.no_radr", &V_ip6_no_radr); 177 178 TAILQ_INIT(&V_in6_ifaddrhead); 179 V_in6_ifaddrhashtbl = hashinit(IN6ADDR_NHASH, M_IFADDR, 180 &V_in6_ifaddrhmask); 181 182 /* Initialize packet filter hooks. */ 183 V_inet6_pfil_hook.ph_type = PFIL_TYPE_AF; 184 V_inet6_pfil_hook.ph_af = AF_INET6; 185 if ((i = pfil_head_register(&V_inet6_pfil_hook)) != 0) 186 printf("%s: WARNING: unable to register pfil hook, " 187 "error %d\n", __func__, i); 188 189 scope6_init(); 190 addrsel_policy_init(); 191 nd6_init(); 192 frag6_init(); 193 194 #ifdef FLOWTABLE 195 if (TUNABLE_INT_FETCH("net.inet6.ip6.output_flowtable_size", 196 &V_ip6_output_flowtable_size)) { 197 if (V_ip6_output_flowtable_size < 256) 198 V_ip6_output_flowtable_size = 256; 199 if (!powerof2(V_ip6_output_flowtable_size)) { 200 printf("flowtable must be power of 2 size\n"); 201 V_ip6_output_flowtable_size = 2048; 202 } 203 } else { 204 /* 205 * round up to the next power of 2 206 */ 207 V_ip6_output_flowtable_size = 1 << fls((1024 + maxusers * 64)-1); 208 } 209 V_ip6_ft = flowtable_alloc("ipv6", V_ip6_output_flowtable_size, FL_IPV6|FL_PCPU); 210 #endif 211 212 V_ip6_desync_factor = arc4random() % MAX_TEMP_DESYNC_FACTOR; 213 214 /* Skip global initialization stuff for non-default instances. */ 215 if (!IS_DEFAULT_VNET(curvnet)) 216 return; 217 218 #ifdef DIAGNOSTIC 219 if (sizeof(struct protosw) != sizeof(struct ip6protosw)) 220 panic("sizeof(protosw) != sizeof(ip6protosw)"); 221 #endif 222 pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 223 if (pr == NULL) 224 panic("ip6_init"); 225 226 /* Initialize the entire ip6_protox[] array to IPPROTO_RAW. */ 227 for (i = 0; i < IPPROTO_MAX; i++) 228 ip6_protox[i] = pr - inet6sw; 229 /* 230 * Cycle through IP protocols and put them into the appropriate place 231 * in ip6_protox[]. 232 */ 233 for (pr = (struct ip6protosw *)inet6domain.dom_protosw; 234 pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++) 235 if (pr->pr_domain->dom_family == PF_INET6 && 236 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) { 237 /* Be careful to only index valid IP protocols. */ 238 if (pr->pr_protocol < IPPROTO_MAX) 239 ip6_protox[pr->pr_protocol] = pr - inet6sw; 240 } 241 242 netisr_register(&ip6_nh); 243 } 244 245 /* 246 * The protocol to be inserted into ip6_protox[] must be already registered 247 * in inet6sw[], either statically or through pf_proto_register(). 248 */ 249 int 250 ip6proto_register(short ip6proto) 251 { 252 struct ip6protosw *pr; 253 254 /* Sanity checks. */ 255 if (ip6proto <= 0 || ip6proto >= IPPROTO_MAX) 256 return (EPROTONOSUPPORT); 257 258 /* 259 * The protocol slot must not be occupied by another protocol 260 * already. An index pointing to IPPROTO_RAW is unused. 261 */ 262 pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 263 if (pr == NULL) 264 return (EPFNOSUPPORT); 265 if (ip6_protox[ip6proto] != pr - inet6sw) /* IPPROTO_RAW */ 266 return (EEXIST); 267 268 /* 269 * Find the protocol position in inet6sw[] and set the index. 270 */ 271 for (pr = (struct ip6protosw *)inet6domain.dom_protosw; 272 pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++) { 273 if (pr->pr_domain->dom_family == PF_INET6 && 274 pr->pr_protocol && pr->pr_protocol == ip6proto) { 275 ip6_protox[pr->pr_protocol] = pr - inet6sw; 276 return (0); 277 } 278 } 279 return (EPROTONOSUPPORT); 280 } 281 282 int 283 ip6proto_unregister(short ip6proto) 284 { 285 struct ip6protosw *pr; 286 287 /* Sanity checks. */ 288 if (ip6proto <= 0 || ip6proto >= IPPROTO_MAX) 289 return (EPROTONOSUPPORT); 290 291 /* Check if the protocol was indeed registered. */ 292 pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 293 if (pr == NULL) 294 return (EPFNOSUPPORT); 295 if (ip6_protox[ip6proto] == pr - inet6sw) /* IPPROTO_RAW */ 296 return (ENOENT); 297 298 /* Reset the protocol slot to IPPROTO_RAW. */ 299 ip6_protox[ip6proto] = pr - inet6sw; 300 return (0); 301 } 302 303 #ifdef VIMAGE 304 void 305 ip6_destroy() 306 { 307 308 hashdestroy(V_in6_ifaddrhashtbl, M_IFADDR, V_in6_ifaddrhmask); 309 nd6_destroy(); 310 callout_drain(&V_in6_tmpaddrtimer_ch); 311 } 312 #endif 313 314 static int 315 ip6_init2_vnet(const void *unused __unused) 316 { 317 318 /* nd6_timer_init */ 319 callout_init(&V_nd6_timer_ch, 0); 320 callout_reset(&V_nd6_timer_ch, hz, nd6_timer, curvnet); 321 322 /* timer for regeneranation of temporary addresses randomize ID */ 323 callout_init(&V_in6_tmpaddrtimer_ch, 0); 324 callout_reset(&V_in6_tmpaddrtimer_ch, 325 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor - 326 V_ip6_temp_regen_advance) * hz, 327 in6_tmpaddrtimer, curvnet); 328 329 return (0); 330 } 331 332 static void 333 ip6_init2(void *dummy) 334 { 335 336 ip6_init2_vnet(NULL); 337 } 338 339 /* cheat */ 340 /* This must be after route_init(), which is now SI_ORDER_THIRD */ 341 SYSINIT(netinet6init2, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ip6_init2, NULL); 342 343 static int 344 ip6_input_hbh(struct mbuf *m, uint32_t *plen, uint32_t *rtalert, int *off, 345 int *nxt, int *ours) 346 { 347 struct ip6_hdr *ip6; 348 struct ip6_hbh *hbh; 349 350 if (ip6_hopopts_input(plen, rtalert, &m, off)) { 351 #if 0 /*touches NULL pointer*/ 352 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 353 #endif 354 goto out; /* m have already been freed */ 355 } 356 357 /* adjust pointer */ 358 ip6 = mtod(m, struct ip6_hdr *); 359 360 /* 361 * if the payload length field is 0 and the next header field 362 * indicates Hop-by-Hop Options header, then a Jumbo Payload 363 * option MUST be included. 364 */ 365 if (ip6->ip6_plen == 0 && *plen == 0) { 366 /* 367 * Note that if a valid jumbo payload option is 368 * contained, ip6_hopopts_input() must set a valid 369 * (non-zero) payload length to the variable plen. 370 */ 371 IP6STAT_INC(ip6s_badoptions); 372 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 373 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 374 icmp6_error(m, ICMP6_PARAM_PROB, 375 ICMP6_PARAMPROB_HEADER, 376 (caddr_t)&ip6->ip6_plen - (caddr_t)ip6); 377 goto out; 378 } 379 #ifndef PULLDOWN_TEST 380 /* ip6_hopopts_input() ensures that mbuf is contiguous */ 381 hbh = (struct ip6_hbh *)(ip6 + 1); 382 #else 383 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 384 sizeof(struct ip6_hbh)); 385 if (hbh == NULL) { 386 IP6STAT_INC(ip6s_tooshort); 387 goto out; 388 } 389 #endif 390 *nxt = hbh->ip6h_nxt; 391 392 /* 393 * If we are acting as a router and the packet contains a 394 * router alert option, see if we know the option value. 395 * Currently, we only support the option value for MLD, in which 396 * case we should pass the packet to the multicast routing 397 * daemon. 398 */ 399 if (*rtalert != ~0) { 400 switch (*rtalert) { 401 case IP6OPT_RTALERT_MLD: 402 if (V_ip6_forwarding) 403 *ours = 1; 404 break; 405 default: 406 /* 407 * RFC2711 requires unrecognized values must be 408 * silently ignored. 409 */ 410 break; 411 } 412 } 413 414 return (0); 415 416 out: 417 return (1); 418 } 419 420 void 421 ip6_input(struct mbuf *m) 422 { 423 struct ip6_hdr *ip6; 424 int off = sizeof(struct ip6_hdr), nest; 425 u_int32_t plen; 426 u_int32_t rtalert = ~0; 427 int nxt, ours = 0; 428 struct ifnet *deliverifp = NULL, *ifp = NULL; 429 struct in6_addr odst; 430 struct route_in6 rin6; 431 int srcrt = 0; 432 struct llentry *lle = NULL; 433 struct sockaddr_in6 dst6, *dst; 434 435 bzero(&rin6, sizeof(struct route_in6)); 436 #ifdef IPSEC 437 /* 438 * should the inner packet be considered authentic? 439 * see comment in ah4_input(). 440 * NB: m cannot be NULL when passed to the input routine 441 */ 442 443 m->m_flags &= ~M_AUTHIPHDR; 444 m->m_flags &= ~M_AUTHIPDGM; 445 446 #endif /* IPSEC */ 447 448 /* 449 * make sure we don't have onion peering information into m_tag. 450 */ 451 ip6_delaux(m); 452 453 if (m->m_flags & M_FASTFWD_OURS) { 454 /* 455 * Firewall changed destination to local. 456 */ 457 m->m_flags &= ~M_FASTFWD_OURS; 458 ours = 1; 459 deliverifp = m->m_pkthdr.rcvif; 460 ip6 = mtod(m, struct ip6_hdr *); 461 goto hbhcheck; 462 } 463 464 /* 465 * mbuf statistics 466 */ 467 if (m->m_flags & M_EXT) { 468 if (m->m_next) 469 IP6STAT_INC(ip6s_mext2m); 470 else 471 IP6STAT_INC(ip6s_mext1); 472 } else { 473 if (m->m_next) { 474 if (m->m_flags & M_LOOP) { 475 IP6STAT_INC(ip6s_m2m[V_loif->if_index]); 476 } else if (m->m_pkthdr.rcvif->if_index < IP6S_M2MMAX) 477 IP6STAT_INC( 478 ip6s_m2m[m->m_pkthdr.rcvif->if_index]); 479 else 480 IP6STAT_INC(ip6s_m2m[0]); 481 } else 482 IP6STAT_INC(ip6s_m1); 483 } 484 485 /* drop the packet if IPv6 operation is disabled on the IF */ 486 if ((ND_IFINFO(m->m_pkthdr.rcvif)->flags & ND6_IFF_IFDISABLED)) { 487 m_freem(m); 488 return; 489 } 490 491 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive); 492 IP6STAT_INC(ip6s_total); 493 494 #ifndef PULLDOWN_TEST 495 /* 496 * L2 bridge code and some other code can return mbuf chain 497 * that does not conform to KAME requirement. too bad. 498 * XXX: fails to join if interface MTU > MCLBYTES. jumbogram? 499 */ 500 if (m && m->m_next != NULL && m->m_pkthdr.len < MCLBYTES) { 501 struct mbuf *n; 502 503 if (m->m_pkthdr.len > MHLEN) 504 n = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 505 else 506 n = m_gethdr(M_NOWAIT, MT_DATA); 507 if (n == NULL) { 508 m_freem(m); 509 return; /* ENOBUFS */ 510 } 511 512 m_move_pkthdr(n, m); 513 m_copydata(m, 0, n->m_pkthdr.len, mtod(n, caddr_t)); 514 n->m_len = n->m_pkthdr.len; 515 m_freem(m); 516 m = n; 517 } 518 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), /* nothing */); 519 #endif 520 521 if (m->m_len < sizeof(struct ip6_hdr)) { 522 struct ifnet *inifp; 523 inifp = m->m_pkthdr.rcvif; 524 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 525 IP6STAT_INC(ip6s_toosmall); 526 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 527 return; 528 } 529 } 530 531 ip6 = mtod(m, struct ip6_hdr *); 532 533 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 534 IP6STAT_INC(ip6s_badvers); 535 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 536 goto bad; 537 } 538 539 IP6STAT_INC(ip6s_nxthist[ip6->ip6_nxt]); 540 541 /* 542 * Check against address spoofing/corruption. 543 */ 544 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) || 545 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) { 546 /* 547 * XXX: "badscope" is not very suitable for a multicast source. 548 */ 549 IP6STAT_INC(ip6s_badscope); 550 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 551 goto bad; 552 } 553 if (IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) && 554 !(m->m_flags & M_LOOP)) { 555 /* 556 * In this case, the packet should come from the loopback 557 * interface. However, we cannot just check the if_flags, 558 * because ip6_mloopback() passes the "actual" interface 559 * as the outgoing/incoming interface. 560 */ 561 IP6STAT_INC(ip6s_badscope); 562 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 563 goto bad; 564 } 565 566 #ifdef ALTQ 567 if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) { 568 /* packet is dropped by traffic conditioner */ 569 return; 570 } 571 #endif 572 /* 573 * The following check is not documented in specs. A malicious 574 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack 575 * and bypass security checks (act as if it was from 127.0.0.1 by using 576 * IPv6 src ::ffff:127.0.0.1). Be cautious. 577 * 578 * This check chokes if we are in an SIIT cloud. As none of BSDs 579 * support IPv4-less kernel compilation, we cannot support SIIT 580 * environment at all. So, it makes more sense for us to reject any 581 * malicious packets for non-SIIT environment, than try to do a 582 * partial support for SIIT environment. 583 */ 584 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 585 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 586 IP6STAT_INC(ip6s_badscope); 587 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 588 goto bad; 589 } 590 #if 0 591 /* 592 * Reject packets with IPv4 compatible addresses (auto tunnel). 593 * 594 * The code forbids auto tunnel relay case in RFC1933 (the check is 595 * stronger than RFC1933). We may want to re-enable it if mech-xx 596 * is revised to forbid relaying case. 597 */ 598 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) || 599 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) { 600 IP6STAT_INC(ip6s_badscope); 601 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 602 goto bad; 603 } 604 #endif 605 #ifdef IPSEC 606 /* 607 * Bypass packet filtering for packets previously handled by IPsec. 608 */ 609 if (ip6_ipsec_filtertunnel(m)) 610 goto passin; 611 #endif /* IPSEC */ 612 613 /* 614 * Run through list of hooks for input packets. 615 * 616 * NB: Beware of the destination address changing 617 * (e.g. by NAT rewriting). When this happens, 618 * tell ip6_forward to do the right thing. 619 */ 620 odst = ip6->ip6_dst; 621 622 /* Jump over all PFIL processing if hooks are not active. */ 623 if (!PFIL_HOOKED(&V_inet6_pfil_hook)) 624 goto passin; 625 626 if (pfil_run_hooks(&V_inet6_pfil_hook, &m, 627 m->m_pkthdr.rcvif, PFIL_IN, NULL)) 628 return; 629 if (m == NULL) /* consumed by filter */ 630 return; 631 ip6 = mtod(m, struct ip6_hdr *); 632 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst); 633 634 if (m->m_flags & M_FASTFWD_OURS) { 635 m->m_flags &= ~M_FASTFWD_OURS; 636 ours = 1; 637 deliverifp = m->m_pkthdr.rcvif; 638 goto hbhcheck; 639 } 640 if ((m->m_flags & M_IP6_NEXTHOP) && 641 m_tag_find(m, PACKET_TAG_IPFORWARD, NULL) != NULL) { 642 /* 643 * Directly ship the packet on. This allows forwarding 644 * packets originally destined to us to some other directly 645 * connected host. 646 */ 647 ip6_forward(m, 1); 648 goto out; 649 } 650 651 passin: 652 /* 653 * Disambiguate address scope zones (if there is ambiguity). 654 * We first make sure that the original source or destination address 655 * is not in our internal form for scoped addresses. Such addresses 656 * are not necessarily invalid spec-wise, but we cannot accept them due 657 * to the usage conflict. 658 * in6_setscope() then also checks and rejects the cases where src or 659 * dst are the loopback address and the receiving interface 660 * is not loopback. 661 */ 662 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) { 663 IP6STAT_INC(ip6s_badscope); /* XXX */ 664 goto bad; 665 } 666 if (in6_setscope(&ip6->ip6_src, m->m_pkthdr.rcvif, NULL) || 667 in6_setscope(&ip6->ip6_dst, m->m_pkthdr.rcvif, NULL)) { 668 IP6STAT_INC(ip6s_badscope); 669 goto bad; 670 } 671 672 /* 673 * Multicast check. Assume packet is for us to avoid 674 * prematurely taking locks. 675 */ 676 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 677 ours = 1; 678 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast); 679 deliverifp = m->m_pkthdr.rcvif; 680 goto hbhcheck; 681 } 682 683 /* 684 * Unicast check 685 */ 686 687 bzero(&dst6, sizeof(dst6)); 688 dst6.sin6_family = AF_INET6; 689 dst6.sin6_len = sizeof(struct sockaddr_in6); 690 dst6.sin6_addr = ip6->ip6_dst; 691 ifp = m->m_pkthdr.rcvif; 692 IF_AFDATA_RLOCK(ifp); 693 lle = lla_lookup(LLTABLE6(ifp), 0, 694 (struct sockaddr *)&dst6); 695 IF_AFDATA_RUNLOCK(ifp); 696 if ((lle != NULL) && (lle->la_flags & LLE_IFADDR)) { 697 struct ifaddr *ifa; 698 struct in6_ifaddr *ia6; 699 int bad; 700 701 bad = 1; 702 #define sa_equal(a1, a2) \ 703 (bcmp((a1), (a2), ((a1))->sin6_len) == 0) 704 IF_ADDR_RLOCK(ifp); 705 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 706 if (ifa->ifa_addr->sa_family != dst6.sin6_family) 707 continue; 708 if (sa_equal(&dst6, ifa->ifa_addr)) 709 break; 710 } 711 KASSERT(ifa != NULL, ("%s: ifa not found for lle %p", 712 __func__, lle)); 713 #undef sa_equal 714 715 ia6 = (struct in6_ifaddr *)ifa; 716 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) { 717 /* Count the packet in the ip address stats */ 718 ia6->ia_ifa.if_ipackets++; 719 ia6->ia_ifa.if_ibytes += m->m_pkthdr.len; 720 721 /* 722 * record address information into m_tag. 723 */ 724 (void)ip6_setdstifaddr(m, ia6); 725 726 bad = 0; 727 } else { 728 char ip6bufs[INET6_ADDRSTRLEN]; 729 char ip6bufd[INET6_ADDRSTRLEN]; 730 /* address is not ready, so discard the packet. */ 731 nd6log((LOG_INFO, 732 "ip6_input: packet to an unready address %s->%s\n", 733 ip6_sprintf(ip6bufs, &ip6->ip6_src), 734 ip6_sprintf(ip6bufd, &ip6->ip6_dst))); 735 } 736 IF_ADDR_RUNLOCK(ifp); 737 LLE_RUNLOCK(lle); 738 if (bad) 739 goto bad; 740 else { 741 ours = 1; 742 deliverifp = ifp; 743 goto hbhcheck; 744 } 745 } 746 if (lle != NULL) 747 LLE_RUNLOCK(lle); 748 749 dst = &rin6.ro_dst; 750 dst->sin6_len = sizeof(struct sockaddr_in6); 751 dst->sin6_family = AF_INET6; 752 dst->sin6_addr = ip6->ip6_dst; 753 rin6.ro_rt = in6_rtalloc1((struct sockaddr *)dst, 0, 0, M_GETFIB(m)); 754 if (rin6.ro_rt) 755 RT_UNLOCK(rin6.ro_rt); 756 757 #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key)) 758 759 /* 760 * Accept the packet if the forwarding interface to the destination 761 * according to the routing table is the loopback interface, 762 * unless the associated route has a gateway. 763 * Note that this approach causes to accept a packet if there is a 764 * route to the loopback interface for the destination of the packet. 765 * But we think it's even useful in some situations, e.g. when using 766 * a special daemon which wants to intercept the packet. 767 * 768 * XXX: some OSes automatically make a cloned route for the destination 769 * of an outgoing packet. If the outgoing interface of the packet 770 * is a loopback one, the kernel would consider the packet to be 771 * accepted, even if we have no such address assinged on the interface. 772 * We check the cloned flag of the route entry to reject such cases, 773 * assuming that route entries for our own addresses are not made by 774 * cloning (it should be true because in6_addloop explicitly installs 775 * the host route). However, we might have to do an explicit check 776 * while it would be less efficient. Or, should we rather install a 777 * reject route for such a case? 778 */ 779 if (rin6.ro_rt && 780 (rin6.ro_rt->rt_flags & 781 (RTF_HOST|RTF_GATEWAY)) == RTF_HOST && 782 #ifdef RTF_WASCLONED 783 !(rin6.ro_rt->rt_flags & RTF_WASCLONED) && 784 #endif 785 #ifdef RTF_CLONED 786 !(rin6.ro_rt->rt_flags & RTF_CLONED) && 787 #endif 788 #if 0 789 /* 790 * The check below is redundant since the comparison of 791 * the destination and the key of the rtentry has 792 * already done through looking up the routing table. 793 */ 794 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 795 &rt6_key(rin6.ro_rt)->sin6_addr) 796 #endif 797 rin6.ro_rt->rt_ifp->if_type == IFT_LOOP) { 798 int free_ia6 = 0; 799 struct in6_ifaddr *ia6; 800 801 /* 802 * found the loopback route to the interface address 803 */ 804 if (rin6.ro_rt->rt_gateway->sa_family == AF_LINK) { 805 struct sockaddr_in6 dest6; 806 807 bzero(&dest6, sizeof(dest6)); 808 dest6.sin6_family = AF_INET6; 809 dest6.sin6_len = sizeof(dest6); 810 dest6.sin6_addr = ip6->ip6_dst; 811 ia6 = (struct in6_ifaddr *) 812 ifa_ifwithaddr((struct sockaddr *)&dest6); 813 if (ia6 == NULL) 814 goto bad; 815 free_ia6 = 1; 816 } 817 else 818 ia6 = (struct in6_ifaddr *)rin6.ro_rt->rt_ifa; 819 820 /* 821 * record address information into m_tag. 822 */ 823 (void)ip6_setdstifaddr(m, ia6); 824 825 /* 826 * packets to a tentative, duplicated, or somehow invalid 827 * address must not be accepted. 828 */ 829 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) { 830 /* this address is ready */ 831 ours = 1; 832 deliverifp = ia6->ia_ifp; /* correct? */ 833 /* Count the packet in the ip address stats */ 834 ia6->ia_ifa.if_ipackets++; 835 ia6->ia_ifa.if_ibytes += m->m_pkthdr.len; 836 if (ia6 != NULL && free_ia6 != 0) 837 ifa_free(&ia6->ia_ifa); 838 goto hbhcheck; 839 } else { 840 char ip6bufs[INET6_ADDRSTRLEN]; 841 char ip6bufd[INET6_ADDRSTRLEN]; 842 /* address is not ready, so discard the packet. */ 843 nd6log((LOG_INFO, 844 "ip6_input: packet to an unready address %s->%s\n", 845 ip6_sprintf(ip6bufs, &ip6->ip6_src), 846 ip6_sprintf(ip6bufd, &ip6->ip6_dst))); 847 848 if (ia6 != NULL && free_ia6 != 0) 849 ifa_free(&ia6->ia_ifa); 850 goto bad; 851 } 852 } 853 854 /* 855 * FAITH (Firewall Aided Internet Translator) 856 */ 857 if (V_ip6_keepfaith) { 858 if (rin6.ro_rt && rin6.ro_rt->rt_ifp && 859 rin6.ro_rt->rt_ifp->if_type == IFT_FAITH) { 860 /* XXX do we need more sanity checks? */ 861 ours = 1; 862 deliverifp = rin6.ro_rt->rt_ifp; /* faith */ 863 goto hbhcheck; 864 } 865 } 866 867 /* 868 * Now there is no reason to process the packet if it's not our own 869 * and we're not a router. 870 */ 871 if (!V_ip6_forwarding) { 872 IP6STAT_INC(ip6s_cantforward); 873 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 874 goto bad; 875 } 876 877 hbhcheck: 878 /* 879 * record address information into m_tag, if we don't have one yet. 880 * note that we are unable to record it, if the address is not listed 881 * as our interface address (e.g. multicast addresses, addresses 882 * within FAITH prefixes and such). 883 */ 884 if (deliverifp) { 885 struct in6_ifaddr *ia6; 886 887 if ((ia6 = ip6_getdstifaddr(m)) != NULL) { 888 ifa_free(&ia6->ia_ifa); 889 } else { 890 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 891 if (ia6) { 892 if (!ip6_setdstifaddr(m, ia6)) { 893 /* 894 * XXX maybe we should drop the packet here, 895 * as we could not provide enough information 896 * to the upper layers. 897 */ 898 } 899 ifa_free(&ia6->ia_ifa); 900 } 901 } 902 } 903 904 /* 905 * Process Hop-by-Hop options header if it's contained. 906 * m may be modified in ip6_hopopts_input(). 907 * If a JumboPayload option is included, plen will also be modified. 908 */ 909 plen = (u_int32_t)ntohs(ip6->ip6_plen); 910 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 911 int error; 912 913 error = ip6_input_hbh(m, &plen, &rtalert, &off, &nxt, &ours); 914 if (error != 0) 915 goto out; 916 } else 917 nxt = ip6->ip6_nxt; 918 919 /* 920 * Check that the amount of data in the buffers 921 * is as at least much as the IPv6 header would have us expect. 922 * Trim mbufs if longer than we expect. 923 * Drop packet if shorter than we expect. 924 */ 925 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 926 IP6STAT_INC(ip6s_tooshort); 927 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 928 goto bad; 929 } 930 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 931 if (m->m_len == m->m_pkthdr.len) { 932 m->m_len = sizeof(struct ip6_hdr) + plen; 933 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 934 } else 935 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 936 } 937 938 /* 939 * Forward if desirable. 940 */ 941 if (V_ip6_mrouter && 942 IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 943 /* 944 * If we are acting as a multicast router, all 945 * incoming multicast packets are passed to the 946 * kernel-level multicast forwarding function. 947 * The packet is returned (relatively) intact; if 948 * ip6_mforward() returns a non-zero value, the packet 949 * must be discarded, else it may be accepted below. 950 * 951 * XXX TODO: Check hlim and multicast scope here to avoid 952 * unnecessarily calling into ip6_mforward(). 953 */ 954 if (ip6_mforward && 955 ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) { 956 IP6STAT_INC(ip6s_cantforward); 957 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 958 goto bad; 959 } 960 } else if (!ours) { 961 ip6_forward(m, srcrt); 962 goto out; 963 } 964 965 ip6 = mtod(m, struct ip6_hdr *); 966 967 /* 968 * Malicious party may be able to use IPv4 mapped addr to confuse 969 * tcp/udp stack and bypass security checks (act as if it was from 970 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious. 971 * 972 * For SIIT end node behavior, you may want to disable the check. 973 * However, you will become vulnerable to attacks using IPv4 mapped 974 * source. 975 */ 976 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 977 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 978 IP6STAT_INC(ip6s_badscope); 979 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 980 goto bad; 981 } 982 983 /* 984 * Tell launch routine the next header 985 */ 986 IP6STAT_INC(ip6s_delivered); 987 in6_ifstat_inc(deliverifp, ifs6_in_deliver); 988 nest = 0; 989 990 while (nxt != IPPROTO_DONE) { 991 if (V_ip6_hdrnestlimit && (++nest > V_ip6_hdrnestlimit)) { 992 IP6STAT_INC(ip6s_toomanyhdr); 993 goto bad; 994 } 995 996 /* 997 * protection against faulty packet - there should be 998 * more sanity checks in header chain processing. 999 */ 1000 if (m->m_pkthdr.len < off) { 1001 IP6STAT_INC(ip6s_tooshort); 1002 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 1003 goto bad; 1004 } 1005 1006 #ifdef IPSEC 1007 /* 1008 * enforce IPsec policy checking if we are seeing last header. 1009 * note that we do not visit this with protocols with pcb layer 1010 * code - like udp/tcp/raw ip. 1011 */ 1012 if (ip6_ipsec_input(m, nxt)) 1013 goto bad; 1014 #endif /* IPSEC */ 1015 1016 /* 1017 * Use mbuf flags to propagate Router Alert option to 1018 * ICMPv6 layer, as hop-by-hop options have been stripped. 1019 */ 1020 if (nxt == IPPROTO_ICMPV6 && rtalert != ~0) 1021 m->m_flags |= M_RTALERT_MLD; 1022 1023 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt); 1024 } 1025 goto out; 1026 bad: 1027 m_freem(m); 1028 out: 1029 if (rin6.ro_rt) 1030 RTFREE(rin6.ro_rt); 1031 } 1032 1033 /* 1034 * set/grab in6_ifaddr correspond to IPv6 destination address. 1035 * XXX backward compatibility wrapper 1036 * 1037 * XXXRW: We should bump the refcount on ia6 before sticking it in the m_tag, 1038 * and then bump it when the tag is copied, and release it when the tag is 1039 * freed. Unfortunately, m_tags don't support deep copies (yet), so instead 1040 * we just bump the ia refcount when we receive it. This should be fixed. 1041 */ 1042 static struct ip6aux * 1043 ip6_setdstifaddr(struct mbuf *m, struct in6_ifaddr *ia6) 1044 { 1045 struct ip6aux *ip6a; 1046 1047 ip6a = ip6_addaux(m); 1048 if (ip6a) 1049 ip6a->ip6a_dstia6 = ia6; 1050 return ip6a; /* NULL if failed to set */ 1051 } 1052 1053 struct in6_ifaddr * 1054 ip6_getdstifaddr(struct mbuf *m) 1055 { 1056 struct ip6aux *ip6a; 1057 struct in6_ifaddr *ia; 1058 1059 ip6a = ip6_findaux(m); 1060 if (ip6a) { 1061 ia = ip6a->ip6a_dstia6; 1062 ifa_ref(&ia->ia_ifa); 1063 return ia; 1064 } else 1065 return NULL; 1066 } 1067 1068 /* 1069 * Hop-by-Hop options header processing. If a valid jumbo payload option is 1070 * included, the real payload length will be stored in plenp. 1071 * 1072 * rtalertp - XXX: should be stored more smart way 1073 */ 1074 static int 1075 ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp, 1076 struct mbuf **mp, int *offp) 1077 { 1078 struct mbuf *m = *mp; 1079 int off = *offp, hbhlen; 1080 struct ip6_hbh *hbh; 1081 u_int8_t *opt; 1082 1083 /* validation of the length of the header */ 1084 #ifndef PULLDOWN_TEST 1085 IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1); 1086 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); 1087 hbhlen = (hbh->ip6h_len + 1) << 3; 1088 1089 IP6_EXTHDR_CHECK(m, off, hbhlen, -1); 1090 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); 1091 #else 1092 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, 1093 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh)); 1094 if (hbh == NULL) { 1095 IP6STAT_INC(ip6s_tooshort); 1096 return -1; 1097 } 1098 hbhlen = (hbh->ip6h_len + 1) << 3; 1099 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 1100 hbhlen); 1101 if (hbh == NULL) { 1102 IP6STAT_INC(ip6s_tooshort); 1103 return -1; 1104 } 1105 #endif 1106 off += hbhlen; 1107 hbhlen -= sizeof(struct ip6_hbh); 1108 opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh); 1109 1110 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 1111 hbhlen, rtalertp, plenp) < 0) 1112 return (-1); 1113 1114 *offp = off; 1115 *mp = m; 1116 return (0); 1117 } 1118 1119 /* 1120 * Search header for all Hop-by-hop options and process each option. 1121 * This function is separate from ip6_hopopts_input() in order to 1122 * handle a case where the sending node itself process its hop-by-hop 1123 * options header. In such a case, the function is called from ip6_output(). 1124 * 1125 * The function assumes that hbh header is located right after the IPv6 header 1126 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to 1127 * opthead + hbhlen is located in contiguous memory region. 1128 */ 1129 int 1130 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen, 1131 u_int32_t *rtalertp, u_int32_t *plenp) 1132 { 1133 struct ip6_hdr *ip6; 1134 int optlen = 0; 1135 u_int8_t *opt = opthead; 1136 u_int16_t rtalert_val; 1137 u_int32_t jumboplen; 1138 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh); 1139 1140 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 1141 switch (*opt) { 1142 case IP6OPT_PAD1: 1143 optlen = 1; 1144 break; 1145 case IP6OPT_PADN: 1146 if (hbhlen < IP6OPT_MINLEN) { 1147 IP6STAT_INC(ip6s_toosmall); 1148 goto bad; 1149 } 1150 optlen = *(opt + 1) + 2; 1151 break; 1152 case IP6OPT_ROUTER_ALERT: 1153 /* XXX may need check for alignment */ 1154 if (hbhlen < IP6OPT_RTALERT_LEN) { 1155 IP6STAT_INC(ip6s_toosmall); 1156 goto bad; 1157 } 1158 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) { 1159 /* XXX stat */ 1160 icmp6_error(m, ICMP6_PARAM_PROB, 1161 ICMP6_PARAMPROB_HEADER, 1162 erroff + opt + 1 - opthead); 1163 return (-1); 1164 } 1165 optlen = IP6OPT_RTALERT_LEN; 1166 bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2); 1167 *rtalertp = ntohs(rtalert_val); 1168 break; 1169 case IP6OPT_JUMBO: 1170 /* XXX may need check for alignment */ 1171 if (hbhlen < IP6OPT_JUMBO_LEN) { 1172 IP6STAT_INC(ip6s_toosmall); 1173 goto bad; 1174 } 1175 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) { 1176 /* XXX stat */ 1177 icmp6_error(m, ICMP6_PARAM_PROB, 1178 ICMP6_PARAMPROB_HEADER, 1179 erroff + opt + 1 - opthead); 1180 return (-1); 1181 } 1182 optlen = IP6OPT_JUMBO_LEN; 1183 1184 /* 1185 * IPv6 packets that have non 0 payload length 1186 * must not contain a jumbo payload option. 1187 */ 1188 ip6 = mtod(m, struct ip6_hdr *); 1189 if (ip6->ip6_plen) { 1190 IP6STAT_INC(ip6s_badoptions); 1191 icmp6_error(m, ICMP6_PARAM_PROB, 1192 ICMP6_PARAMPROB_HEADER, 1193 erroff + opt - opthead); 1194 return (-1); 1195 } 1196 1197 /* 1198 * We may see jumbolen in unaligned location, so 1199 * we'd need to perform bcopy(). 1200 */ 1201 bcopy(opt + 2, &jumboplen, sizeof(jumboplen)); 1202 jumboplen = (u_int32_t)htonl(jumboplen); 1203 1204 #if 1 1205 /* 1206 * if there are multiple jumbo payload options, 1207 * *plenp will be non-zero and the packet will be 1208 * rejected. 1209 * the behavior may need some debate in ipngwg - 1210 * multiple options does not make sense, however, 1211 * there's no explicit mention in specification. 1212 */ 1213 if (*plenp != 0) { 1214 IP6STAT_INC(ip6s_badoptions); 1215 icmp6_error(m, ICMP6_PARAM_PROB, 1216 ICMP6_PARAMPROB_HEADER, 1217 erroff + opt + 2 - opthead); 1218 return (-1); 1219 } 1220 #endif 1221 1222 /* 1223 * jumbo payload length must be larger than 65535. 1224 */ 1225 if (jumboplen <= IPV6_MAXPACKET) { 1226 IP6STAT_INC(ip6s_badoptions); 1227 icmp6_error(m, ICMP6_PARAM_PROB, 1228 ICMP6_PARAMPROB_HEADER, 1229 erroff + opt + 2 - opthead); 1230 return (-1); 1231 } 1232 *plenp = jumboplen; 1233 1234 break; 1235 default: /* unknown option */ 1236 if (hbhlen < IP6OPT_MINLEN) { 1237 IP6STAT_INC(ip6s_toosmall); 1238 goto bad; 1239 } 1240 optlen = ip6_unknown_opt(opt, m, 1241 erroff + opt - opthead); 1242 if (optlen == -1) 1243 return (-1); 1244 optlen += 2; 1245 break; 1246 } 1247 } 1248 1249 return (0); 1250 1251 bad: 1252 m_freem(m); 1253 return (-1); 1254 } 1255 1256 /* 1257 * Unknown option processing. 1258 * The third argument `off' is the offset from the IPv6 header to the option, 1259 * which is necessary if the IPv6 header the and option header and IPv6 header 1260 * is not contiguous in order to return an ICMPv6 error. 1261 */ 1262 int 1263 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off) 1264 { 1265 struct ip6_hdr *ip6; 1266 1267 switch (IP6OPT_TYPE(*optp)) { 1268 case IP6OPT_TYPE_SKIP: /* ignore the option */ 1269 return ((int)*(optp + 1)); 1270 case IP6OPT_TYPE_DISCARD: /* silently discard */ 1271 m_freem(m); 1272 return (-1); 1273 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 1274 IP6STAT_INC(ip6s_badoptions); 1275 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 1276 return (-1); 1277 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 1278 IP6STAT_INC(ip6s_badoptions); 1279 ip6 = mtod(m, struct ip6_hdr *); 1280 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 1281 (m->m_flags & (M_BCAST|M_MCAST))) 1282 m_freem(m); 1283 else 1284 icmp6_error(m, ICMP6_PARAM_PROB, 1285 ICMP6_PARAMPROB_OPTION, off); 1286 return (-1); 1287 } 1288 1289 m_freem(m); /* XXX: NOTREACHED */ 1290 return (-1); 1291 } 1292 1293 /* 1294 * Create the "control" list for this pcb. 1295 * These functions will not modify mbuf chain at all. 1296 * 1297 * With KAME mbuf chain restriction: 1298 * The routine will be called from upper layer handlers like tcp6_input(). 1299 * Thus the routine assumes that the caller (tcp6_input) have already 1300 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the 1301 * very first mbuf on the mbuf chain. 1302 * 1303 * ip6_savecontrol_v4 will handle those options that are possible to be 1304 * set on a v4-mapped socket. 1305 * ip6_savecontrol will directly call ip6_savecontrol_v4 to handle those 1306 * options and handle the v6-only ones itself. 1307 */ 1308 struct mbuf ** 1309 ip6_savecontrol_v4(struct inpcb *inp, struct mbuf *m, struct mbuf **mp, 1310 int *v4only) 1311 { 1312 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1313 1314 #ifdef SO_TIMESTAMP 1315 if ((inp->inp_socket->so_options & SO_TIMESTAMP) != 0) { 1316 struct timeval tv; 1317 1318 microtime(&tv); 1319 *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv), 1320 SCM_TIMESTAMP, SOL_SOCKET); 1321 if (*mp) 1322 mp = &(*mp)->m_next; 1323 } 1324 #endif 1325 1326 #define IS2292(inp, x, y) (((inp)->inp_flags & IN6P_RFC2292) ? (x) : (y)) 1327 /* RFC 2292 sec. 5 */ 1328 if ((inp->inp_flags & IN6P_PKTINFO) != 0) { 1329 struct in6_pktinfo pi6; 1330 1331 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1332 #ifdef INET 1333 struct ip *ip; 1334 1335 ip = mtod(m, struct ip *); 1336 pi6.ipi6_addr.s6_addr32[0] = 0; 1337 pi6.ipi6_addr.s6_addr32[1] = 0; 1338 pi6.ipi6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP; 1339 pi6.ipi6_addr.s6_addr32[3] = ip->ip_dst.s_addr; 1340 #else 1341 /* We won't hit this code */ 1342 bzero(&pi6.ipi6_addr, sizeof(struct in6_addr)); 1343 #endif 1344 } else { 1345 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr)); 1346 in6_clearscope(&pi6.ipi6_addr); /* XXX */ 1347 } 1348 pi6.ipi6_ifindex = 1349 (m && m->m_pkthdr.rcvif) ? m->m_pkthdr.rcvif->if_index : 0; 1350 1351 *mp = sbcreatecontrol((caddr_t) &pi6, 1352 sizeof(struct in6_pktinfo), 1353 IS2292(inp, IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6); 1354 if (*mp) 1355 mp = &(*mp)->m_next; 1356 } 1357 1358 if ((inp->inp_flags & IN6P_HOPLIMIT) != 0) { 1359 int hlim; 1360 1361 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1362 #ifdef INET 1363 struct ip *ip; 1364 1365 ip = mtod(m, struct ip *); 1366 hlim = ip->ip_ttl; 1367 #else 1368 /* We won't hit this code */ 1369 hlim = 0; 1370 #endif 1371 } else { 1372 hlim = ip6->ip6_hlim & 0xff; 1373 } 1374 *mp = sbcreatecontrol((caddr_t) &hlim, sizeof(int), 1375 IS2292(inp, IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), 1376 IPPROTO_IPV6); 1377 if (*mp) 1378 mp = &(*mp)->m_next; 1379 } 1380 1381 if ((inp->inp_flags & IN6P_TCLASS) != 0) { 1382 int tclass; 1383 1384 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1385 #ifdef INET 1386 struct ip *ip; 1387 1388 ip = mtod(m, struct ip *); 1389 tclass = ip->ip_tos; 1390 #else 1391 /* We won't hit this code */ 1392 tclass = 0; 1393 #endif 1394 } else { 1395 u_int32_t flowinfo; 1396 1397 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK); 1398 flowinfo >>= 20; 1399 tclass = flowinfo & 0xff; 1400 } 1401 *mp = sbcreatecontrol((caddr_t) &tclass, sizeof(int), 1402 IPV6_TCLASS, IPPROTO_IPV6); 1403 if (*mp) 1404 mp = &(*mp)->m_next; 1405 } 1406 1407 if (v4only != NULL) { 1408 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1409 *v4only = 1; 1410 } else { 1411 *v4only = 0; 1412 } 1413 } 1414 1415 return (mp); 1416 } 1417 1418 void 1419 ip6_savecontrol(struct inpcb *in6p, struct mbuf *m, struct mbuf **mp) 1420 { 1421 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1422 int v4only = 0; 1423 1424 mp = ip6_savecontrol_v4(in6p, m, mp, &v4only); 1425 if (v4only) 1426 return; 1427 1428 /* 1429 * IPV6_HOPOPTS socket option. Recall that we required super-user 1430 * privilege for the option (see ip6_ctloutput), but it might be too 1431 * strict, since there might be some hop-by-hop options which can be 1432 * returned to normal user. 1433 * See also RFC 2292 section 6 (or RFC 3542 section 8). 1434 */ 1435 if ((in6p->inp_flags & IN6P_HOPOPTS) != 0) { 1436 /* 1437 * Check if a hop-by-hop options header is contatined in the 1438 * received packet, and if so, store the options as ancillary 1439 * data. Note that a hop-by-hop options header must be 1440 * just after the IPv6 header, which is assured through the 1441 * IPv6 input processing. 1442 */ 1443 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 1444 struct ip6_hbh *hbh; 1445 int hbhlen = 0; 1446 #ifdef PULLDOWN_TEST 1447 struct mbuf *ext; 1448 #endif 1449 1450 #ifndef PULLDOWN_TEST 1451 hbh = (struct ip6_hbh *)(ip6 + 1); 1452 hbhlen = (hbh->ip6h_len + 1) << 3; 1453 #else 1454 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr), 1455 ip6->ip6_nxt); 1456 if (ext == NULL) { 1457 IP6STAT_INC(ip6s_tooshort); 1458 return; 1459 } 1460 hbh = mtod(ext, struct ip6_hbh *); 1461 hbhlen = (hbh->ip6h_len + 1) << 3; 1462 if (hbhlen != ext->m_len) { 1463 m_freem(ext); 1464 IP6STAT_INC(ip6s_tooshort); 1465 return; 1466 } 1467 #endif 1468 1469 /* 1470 * XXX: We copy the whole header even if a 1471 * jumbo payload option is included, the option which 1472 * is to be removed before returning according to 1473 * RFC2292. 1474 * Note: this constraint is removed in RFC3542 1475 */ 1476 *mp = sbcreatecontrol((caddr_t)hbh, hbhlen, 1477 IS2292(in6p, IPV6_2292HOPOPTS, IPV6_HOPOPTS), 1478 IPPROTO_IPV6); 1479 if (*mp) 1480 mp = &(*mp)->m_next; 1481 #ifdef PULLDOWN_TEST 1482 m_freem(ext); 1483 #endif 1484 } 1485 } 1486 1487 if ((in6p->inp_flags & (IN6P_RTHDR | IN6P_DSTOPTS)) != 0) { 1488 int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr); 1489 1490 /* 1491 * Search for destination options headers or routing 1492 * header(s) through the header chain, and stores each 1493 * header as ancillary data. 1494 * Note that the order of the headers remains in 1495 * the chain of ancillary data. 1496 */ 1497 while (1) { /* is explicit loop prevention necessary? */ 1498 struct ip6_ext *ip6e = NULL; 1499 int elen; 1500 #ifdef PULLDOWN_TEST 1501 struct mbuf *ext = NULL; 1502 #endif 1503 1504 /* 1505 * if it is not an extension header, don't try to 1506 * pull it from the chain. 1507 */ 1508 switch (nxt) { 1509 case IPPROTO_DSTOPTS: 1510 case IPPROTO_ROUTING: 1511 case IPPROTO_HOPOPTS: 1512 case IPPROTO_AH: /* is it possible? */ 1513 break; 1514 default: 1515 goto loopend; 1516 } 1517 1518 #ifndef PULLDOWN_TEST 1519 if (off + sizeof(*ip6e) > m->m_len) 1520 goto loopend; 1521 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off); 1522 if (nxt == IPPROTO_AH) 1523 elen = (ip6e->ip6e_len + 2) << 2; 1524 else 1525 elen = (ip6e->ip6e_len + 1) << 3; 1526 if (off + elen > m->m_len) 1527 goto loopend; 1528 #else 1529 ext = ip6_pullexthdr(m, off, nxt); 1530 if (ext == NULL) { 1531 IP6STAT_INC(ip6s_tooshort); 1532 return; 1533 } 1534 ip6e = mtod(ext, struct ip6_ext *); 1535 if (nxt == IPPROTO_AH) 1536 elen = (ip6e->ip6e_len + 2) << 2; 1537 else 1538 elen = (ip6e->ip6e_len + 1) << 3; 1539 if (elen != ext->m_len) { 1540 m_freem(ext); 1541 IP6STAT_INC(ip6s_tooshort); 1542 return; 1543 } 1544 #endif 1545 1546 switch (nxt) { 1547 case IPPROTO_DSTOPTS: 1548 if (!(in6p->inp_flags & IN6P_DSTOPTS)) 1549 break; 1550 1551 *mp = sbcreatecontrol((caddr_t)ip6e, elen, 1552 IS2292(in6p, 1553 IPV6_2292DSTOPTS, IPV6_DSTOPTS), 1554 IPPROTO_IPV6); 1555 if (*mp) 1556 mp = &(*mp)->m_next; 1557 break; 1558 case IPPROTO_ROUTING: 1559 if (!(in6p->inp_flags & IN6P_RTHDR)) 1560 break; 1561 1562 *mp = sbcreatecontrol((caddr_t)ip6e, elen, 1563 IS2292(in6p, IPV6_2292RTHDR, IPV6_RTHDR), 1564 IPPROTO_IPV6); 1565 if (*mp) 1566 mp = &(*mp)->m_next; 1567 break; 1568 case IPPROTO_HOPOPTS: 1569 case IPPROTO_AH: /* is it possible? */ 1570 break; 1571 1572 default: 1573 /* 1574 * other cases have been filtered in the above. 1575 * none will visit this case. here we supply 1576 * the code just in case (nxt overwritten or 1577 * other cases). 1578 */ 1579 #ifdef PULLDOWN_TEST 1580 m_freem(ext); 1581 #endif 1582 goto loopend; 1583 1584 } 1585 1586 /* proceed with the next header. */ 1587 off += elen; 1588 nxt = ip6e->ip6e_nxt; 1589 ip6e = NULL; 1590 #ifdef PULLDOWN_TEST 1591 m_freem(ext); 1592 ext = NULL; 1593 #endif 1594 } 1595 loopend: 1596 ; 1597 } 1598 } 1599 #undef IS2292 1600 1601 void 1602 ip6_notify_pmtu(struct inpcb *in6p, struct sockaddr_in6 *dst, u_int32_t *mtu) 1603 { 1604 struct socket *so; 1605 struct mbuf *m_mtu; 1606 struct ip6_mtuinfo mtuctl; 1607 1608 so = in6p->inp_socket; 1609 1610 if (mtu == NULL) 1611 return; 1612 1613 #ifdef DIAGNOSTIC 1614 if (so == NULL) /* I believe this is impossible */ 1615 panic("ip6_notify_pmtu: socket is NULL"); 1616 #endif 1617 1618 bzero(&mtuctl, sizeof(mtuctl)); /* zero-clear for safety */ 1619 mtuctl.ip6m_mtu = *mtu; 1620 mtuctl.ip6m_addr = *dst; 1621 if (sa6_recoverscope(&mtuctl.ip6m_addr)) 1622 return; 1623 1624 if ((m_mtu = sbcreatecontrol((caddr_t)&mtuctl, sizeof(mtuctl), 1625 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL) 1626 return; 1627 1628 if (sbappendaddr(&so->so_rcv, (struct sockaddr *)dst, NULL, m_mtu) 1629 == 0) { 1630 m_freem(m_mtu); 1631 /* XXX: should count statistics */ 1632 } else 1633 sorwakeup(so); 1634 1635 return; 1636 } 1637 1638 #ifdef PULLDOWN_TEST 1639 /* 1640 * pull single extension header from mbuf chain. returns single mbuf that 1641 * contains the result, or NULL on error. 1642 */ 1643 static struct mbuf * 1644 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt) 1645 { 1646 struct ip6_ext ip6e; 1647 size_t elen; 1648 struct mbuf *n; 1649 1650 #ifdef DIAGNOSTIC 1651 switch (nxt) { 1652 case IPPROTO_DSTOPTS: 1653 case IPPROTO_ROUTING: 1654 case IPPROTO_HOPOPTS: 1655 case IPPROTO_AH: /* is it possible? */ 1656 break; 1657 default: 1658 printf("ip6_pullexthdr: invalid nxt=%d\n", nxt); 1659 } 1660 #endif 1661 1662 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1663 if (nxt == IPPROTO_AH) 1664 elen = (ip6e.ip6e_len + 2) << 2; 1665 else 1666 elen = (ip6e.ip6e_len + 1) << 3; 1667 1668 if (elen > MLEN) 1669 n = m_getcl(M_NOWAIT, MT_DATA, 0); 1670 else 1671 n = m_get(M_NOWAIT, MT_DATA); 1672 if (n == NULL) 1673 return NULL; 1674 1675 m_copydata(m, off, elen, mtod(n, caddr_t)); 1676 n->m_len = elen; 1677 return n; 1678 } 1679 #endif 1680 1681 /* 1682 * Get pointer to the previous header followed by the header 1683 * currently processed. 1684 * XXX: This function supposes that 1685 * M includes all headers, 1686 * the next header field and the header length field of each header 1687 * are valid, and 1688 * the sum of each header length equals to OFF. 1689 * Because of these assumptions, this function must be called very 1690 * carefully. Moreover, it will not be used in the near future when 1691 * we develop `neater' mechanism to process extension headers. 1692 */ 1693 char * 1694 ip6_get_prevhdr(struct mbuf *m, int off) 1695 { 1696 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1697 1698 if (off == sizeof(struct ip6_hdr)) 1699 return (&ip6->ip6_nxt); 1700 else { 1701 int len, nxt; 1702 struct ip6_ext *ip6e = NULL; 1703 1704 nxt = ip6->ip6_nxt; 1705 len = sizeof(struct ip6_hdr); 1706 while (len < off) { 1707 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len); 1708 1709 switch (nxt) { 1710 case IPPROTO_FRAGMENT: 1711 len += sizeof(struct ip6_frag); 1712 break; 1713 case IPPROTO_AH: 1714 len += (ip6e->ip6e_len + 2) << 2; 1715 break; 1716 default: 1717 len += (ip6e->ip6e_len + 1) << 3; 1718 break; 1719 } 1720 nxt = ip6e->ip6e_nxt; 1721 } 1722 if (ip6e) 1723 return (&ip6e->ip6e_nxt); 1724 else 1725 return NULL; 1726 } 1727 } 1728 1729 /* 1730 * get next header offset. m will be retained. 1731 */ 1732 int 1733 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp) 1734 { 1735 struct ip6_hdr ip6; 1736 struct ip6_ext ip6e; 1737 struct ip6_frag fh; 1738 1739 /* just in case */ 1740 if (m == NULL) 1741 panic("ip6_nexthdr: m == NULL"); 1742 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off) 1743 return -1; 1744 1745 switch (proto) { 1746 case IPPROTO_IPV6: 1747 if (m->m_pkthdr.len < off + sizeof(ip6)) 1748 return -1; 1749 m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6); 1750 if (nxtp) 1751 *nxtp = ip6.ip6_nxt; 1752 off += sizeof(ip6); 1753 return off; 1754 1755 case IPPROTO_FRAGMENT: 1756 /* 1757 * terminate parsing if it is not the first fragment, 1758 * it does not make sense to parse through it. 1759 */ 1760 if (m->m_pkthdr.len < off + sizeof(fh)) 1761 return -1; 1762 m_copydata(m, off, sizeof(fh), (caddr_t)&fh); 1763 /* IP6F_OFF_MASK = 0xfff8(BigEndian), 0xf8ff(LittleEndian) */ 1764 if (fh.ip6f_offlg & IP6F_OFF_MASK) 1765 return -1; 1766 if (nxtp) 1767 *nxtp = fh.ip6f_nxt; 1768 off += sizeof(struct ip6_frag); 1769 return off; 1770 1771 case IPPROTO_AH: 1772 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1773 return -1; 1774 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1775 if (nxtp) 1776 *nxtp = ip6e.ip6e_nxt; 1777 off += (ip6e.ip6e_len + 2) << 2; 1778 return off; 1779 1780 case IPPROTO_HOPOPTS: 1781 case IPPROTO_ROUTING: 1782 case IPPROTO_DSTOPTS: 1783 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1784 return -1; 1785 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1786 if (nxtp) 1787 *nxtp = ip6e.ip6e_nxt; 1788 off += (ip6e.ip6e_len + 1) << 3; 1789 return off; 1790 1791 case IPPROTO_NONE: 1792 case IPPROTO_ESP: 1793 case IPPROTO_IPCOMP: 1794 /* give up */ 1795 return -1; 1796 1797 default: 1798 return -1; 1799 } 1800 1801 return -1; 1802 } 1803 1804 /* 1805 * get offset for the last header in the chain. m will be kept untainted. 1806 */ 1807 int 1808 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp) 1809 { 1810 int newoff; 1811 int nxt; 1812 1813 if (!nxtp) { 1814 nxt = -1; 1815 nxtp = &nxt; 1816 } 1817 while (1) { 1818 newoff = ip6_nexthdr(m, off, proto, nxtp); 1819 if (newoff < 0) 1820 return off; 1821 else if (newoff < off) 1822 return -1; /* invalid */ 1823 else if (newoff == off) 1824 return newoff; 1825 1826 off = newoff; 1827 proto = *nxtp; 1828 } 1829 } 1830 1831 static struct ip6aux * 1832 ip6_addaux(struct mbuf *m) 1833 { 1834 struct m_tag *mtag; 1835 1836 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL); 1837 if (!mtag) { 1838 mtag = m_tag_get(PACKET_TAG_IPV6_INPUT, sizeof(struct ip6aux), 1839 M_NOWAIT); 1840 if (mtag) { 1841 m_tag_prepend(m, mtag); 1842 bzero(mtag + 1, sizeof(struct ip6aux)); 1843 } 1844 } 1845 return mtag ? (struct ip6aux *)(mtag + 1) : NULL; 1846 } 1847 1848 static struct ip6aux * 1849 ip6_findaux(struct mbuf *m) 1850 { 1851 struct m_tag *mtag; 1852 1853 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL); 1854 return mtag ? (struct ip6aux *)(mtag + 1) : NULL; 1855 } 1856 1857 static void 1858 ip6_delaux(struct mbuf *m) 1859 { 1860 struct m_tag *mtag; 1861 1862 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL); 1863 if (mtag) 1864 m_tag_delete(m, mtag); 1865 } 1866 1867 /* 1868 * System control for IP6 1869 */ 1870 1871 u_char inet6ctlerrmap[PRC_NCMDS] = { 1872 0, 0, 0, 0, 1873 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 1874 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 1875 EMSGSIZE, EHOSTUNREACH, 0, 0, 1876 0, 0, 0, 0, 1877 ENOPROTOOPT 1878 }; 1879