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sys/netinet6/ip6_input.c
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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); 129 130 static struct netisr_handler ip6_nh = { 131 .nh_name = "ip6", 132 .nh_handler = ip6_input, 133 .nh_proto = NETISR_IPV6, 134 .nh_policy = NETISR_POLICY_FLOW, 135 }; 136 137 VNET_DECLARE(struct callout, in6_tmpaddrtimer_ch); 138 #define V_in6_tmpaddrtimer_ch VNET(in6_tmpaddrtimer_ch) 139 140 VNET_DEFINE(struct pfil_head, inet6_pfil_hook); 141 142 VNET_DEFINE(struct ip6stat, ip6stat); 143 144 struct rwlock in6_ifaddr_lock; 145 RW_SYSINIT(in6_ifaddr_lock, &in6_ifaddr_lock, "in6_ifaddr_lock"); 146 147 static void ip6_init2(void *); 148 static struct ip6aux *ip6_setdstifaddr(struct mbuf *, struct in6_ifaddr *); 149 static struct ip6aux *ip6_addaux(struct mbuf *); 150 static struct ip6aux *ip6_findaux(struct mbuf *m); 151 static void ip6_delaux (struct mbuf *); 152 static int ip6_hopopts_input(u_int32_t *, u_int32_t *, struct mbuf **, int *); 153 #ifdef PULLDOWN_TEST 154 static struct mbuf *ip6_pullexthdr(struct mbuf *, size_t, int); 155 #endif 156 157 /* 158 * IP6 initialization: fill in IP6 protocol switch table. 159 * All protocols not implemented in kernel go to raw IP6 protocol handler. 160 */ 161 void 162 ip6_init(void) 163 { 164 struct ip6protosw *pr; 165 int i; 166 167 TUNABLE_INT_FETCH("net.inet6.ip6.auto_linklocal", 168 &V_ip6_auto_linklocal); 169 TUNABLE_INT_FETCH("net.inet6.ip6.accept_rtadv", &V_ip6_accept_rtadv); 170 TUNABLE_INT_FETCH("net.inet6.ip6.no_radr", &V_ip6_no_radr); 171 172 TAILQ_INIT(&V_in6_ifaddrhead); 173 174 /* Initialize packet filter hooks. */ 175 V_inet6_pfil_hook.ph_type = PFIL_TYPE_AF; 176 V_inet6_pfil_hook.ph_af = AF_INET6; 177 if ((i = pfil_head_register(&V_inet6_pfil_hook)) != 0) 178 printf("%s: WARNING: unable to register pfil hook, " 179 "error %d\n", __func__, i); 180 181 scope6_init(); 182 addrsel_policy_init(); 183 nd6_init(); 184 frag6_init(); 185 186 #ifdef FLOWTABLE 187 if (TUNABLE_INT_FETCH("net.inet6.ip6.output_flowtable_size", 188 &V_ip6_output_flowtable_size)) { 189 if (V_ip6_output_flowtable_size < 256) 190 V_ip6_output_flowtable_size = 256; 191 if (!powerof2(V_ip6_output_flowtable_size)) { 192 printf("flowtable must be power of 2 size\n"); 193 V_ip6_output_flowtable_size = 2048; 194 } 195 } else { 196 /* 197 * round up to the next power of 2 198 */ 199 V_ip6_output_flowtable_size = 1 << fls((1024 + maxusers * 64)-1); 200 } 201 V_ip6_ft = flowtable_alloc("ipv6", V_ip6_output_flowtable_size, FL_IPV6|FL_PCPU); 202 #endif 203 204 V_ip6_desync_factor = arc4random() % MAX_TEMP_DESYNC_FACTOR; 205 206 /* Skip global initialization stuff for non-default instances. */ 207 if (!IS_DEFAULT_VNET(curvnet)) 208 return; 209 210 #ifdef DIAGNOSTIC 211 if (sizeof(struct protosw) != sizeof(struct ip6protosw)) 212 panic("sizeof(protosw) != sizeof(ip6protosw)"); 213 #endif 214 pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 215 if (pr == NULL) 216 panic("ip6_init"); 217 218 /* Initialize the entire ip6_protox[] array to IPPROTO_RAW. */ 219 for (i = 0; i < IPPROTO_MAX; i++) 220 ip6_protox[i] = pr - inet6sw; 221 /* 222 * Cycle through IP protocols and put them into the appropriate place 223 * in ip6_protox[]. 224 */ 225 for (pr = (struct ip6protosw *)inet6domain.dom_protosw; 226 pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++) 227 if (pr->pr_domain->dom_family == PF_INET6 && 228 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) { 229 /* Be careful to only index valid IP protocols. */ 230 if (pr->pr_protocol < IPPROTO_MAX) 231 ip6_protox[pr->pr_protocol] = pr - inet6sw; 232 } 233 234 netisr_register(&ip6_nh); 235 } 236 237 /* 238 * The protocol to be inserted into ip6_protox[] must be already registered 239 * in inet6sw[], either statically or through pf_proto_register(). 240 */ 241 int 242 ip6proto_register(short ip6proto) 243 { 244 struct ip6protosw *pr; 245 246 /* Sanity checks. */ 247 if (ip6proto <= 0 || ip6proto >= IPPROTO_MAX) 248 return (EPROTONOSUPPORT); 249 250 /* 251 * The protocol slot must not be occupied by another protocol 252 * already. An index pointing to IPPROTO_RAW is unused. 253 */ 254 pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 255 if (pr == NULL) 256 return (EPFNOSUPPORT); 257 if (ip6_protox[ip6proto] != pr - inet6sw) /* IPPROTO_RAW */ 258 return (EEXIST); 259 260 /* 261 * Find the protocol position in inet6sw[] and set the index. 262 */ 263 for (pr = (struct ip6protosw *)inet6domain.dom_protosw; 264 pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++) { 265 if (pr->pr_domain->dom_family == PF_INET6 && 266 pr->pr_protocol && pr->pr_protocol == ip6proto) { 267 ip6_protox[pr->pr_protocol] = pr - inet6sw; 268 return (0); 269 } 270 } 271 return (EPROTONOSUPPORT); 272 } 273 274 int 275 ip6proto_unregister(short ip6proto) 276 { 277 struct ip6protosw *pr; 278 279 /* Sanity checks. */ 280 if (ip6proto <= 0 || ip6proto >= IPPROTO_MAX) 281 return (EPROTONOSUPPORT); 282 283 /* Check if the protocol was indeed registered. */ 284 pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 285 if (pr == NULL) 286 return (EPFNOSUPPORT); 287 if (ip6_protox[ip6proto] == pr - inet6sw) /* IPPROTO_RAW */ 288 return (ENOENT); 289 290 /* Reset the protocol slot to IPPROTO_RAW. */ 291 ip6_protox[ip6proto] = pr - inet6sw; 292 return (0); 293 } 294 295 #ifdef VIMAGE 296 void 297 ip6_destroy() 298 { 299 300 nd6_destroy(); 301 callout_drain(&V_in6_tmpaddrtimer_ch); 302 } 303 #endif 304 305 static int 306 ip6_init2_vnet(const void *unused __unused) 307 { 308 309 /* nd6_timer_init */ 310 callout_init(&V_nd6_timer_ch, 0); 311 callout_reset(&V_nd6_timer_ch, hz, nd6_timer, curvnet); 312 313 /* timer for regeneranation of temporary addresses randomize ID */ 314 callout_init(&V_in6_tmpaddrtimer_ch, 0); 315 callout_reset(&V_in6_tmpaddrtimer_ch, 316 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor - 317 V_ip6_temp_regen_advance) * hz, 318 in6_tmpaddrtimer, curvnet); 319 320 return (0); 321 } 322 323 static void 324 ip6_init2(void *dummy) 325 { 326 327 ip6_init2_vnet(NULL); 328 } 329 330 /* cheat */ 331 /* This must be after route_init(), which is now SI_ORDER_THIRD */ 332 SYSINIT(netinet6init2, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ip6_init2, NULL); 333 334 static int 335 ip6_input_hbh(struct mbuf *m, uint32_t *plen, uint32_t *rtalert, int *off, 336 int *nxt, int *ours) 337 { 338 struct ip6_hdr *ip6; 339 struct ip6_hbh *hbh; 340 341 if (ip6_hopopts_input(plen, rtalert, &m, off)) { 342 #if 0 /*touches NULL pointer*/ 343 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 344 #endif 345 goto out; /* m have already been freed */ 346 } 347 348 /* adjust pointer */ 349 ip6 = mtod(m, struct ip6_hdr *); 350 351 /* 352 * if the payload length field is 0 and the next header field 353 * indicates Hop-by-Hop Options header, then a Jumbo Payload 354 * option MUST be included. 355 */ 356 if (ip6->ip6_plen == 0 && *plen == 0) { 357 /* 358 * Note that if a valid jumbo payload option is 359 * contained, ip6_hopopts_input() must set a valid 360 * (non-zero) payload length to the variable plen. 361 */ 362 IP6STAT_INC(ip6s_badoptions); 363 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 364 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 365 icmp6_error(m, ICMP6_PARAM_PROB, 366 ICMP6_PARAMPROB_HEADER, 367 (caddr_t)&ip6->ip6_plen - (caddr_t)ip6); 368 goto out; 369 } 370 #ifndef PULLDOWN_TEST 371 /* ip6_hopopts_input() ensures that mbuf is contiguous */ 372 hbh = (struct ip6_hbh *)(ip6 + 1); 373 #else 374 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 375 sizeof(struct ip6_hbh)); 376 if (hbh == NULL) { 377 IP6STAT_INC(ip6s_tooshort); 378 goto out; 379 } 380 #endif 381 *nxt = hbh->ip6h_nxt; 382 383 /* 384 * If we are acting as a router and the packet contains a 385 * router alert option, see if we know the option value. 386 * Currently, we only support the option value for MLD, in which 387 * case we should pass the packet to the multicast routing 388 * daemon. 389 */ 390 if (*rtalert != ~0) { 391 switch (*rtalert) { 392 case IP6OPT_RTALERT_MLD: 393 if (V_ip6_forwarding) 394 *ours = 1; 395 break; 396 default: 397 /* 398 * RFC2711 requires unrecognized values must be 399 * silently ignored. 400 */ 401 break; 402 } 403 } 404 405 return (0); 406 407 out: 408 return (1); 409 } 410 411 void 412 ip6_input(struct mbuf *m) 413 { 414 struct ip6_hdr *ip6; 415 int off = sizeof(struct ip6_hdr), nest; 416 u_int32_t plen; 417 u_int32_t rtalert = ~0; 418 int nxt, ours = 0; 419 struct ifnet *deliverifp = NULL, *ifp = NULL; 420 struct in6_addr odst; 421 struct route_in6 rin6; 422 int srcrt = 0; 423 struct llentry *lle = NULL; 424 struct sockaddr_in6 dst6, *dst; 425 426 bzero(&rin6, sizeof(struct route_in6)); 427 #ifdef IPSEC 428 /* 429 * should the inner packet be considered authentic? 430 * see comment in ah4_input(). 431 * NB: m cannot be NULL when passed to the input routine 432 */ 433 434 m->m_flags &= ~M_AUTHIPHDR; 435 m->m_flags &= ~M_AUTHIPDGM; 436 437 #endif /* IPSEC */ 438 439 /* 440 * make sure we don't have onion peering information into m_tag. 441 */ 442 ip6_delaux(m); 443 444 if (m->m_flags & M_FASTFWD_OURS) { 445 /* 446 * Firewall changed destination to local. 447 */ 448 m->m_flags &= ~M_FASTFWD_OURS; 449 ours = 1; 450 deliverifp = m->m_pkthdr.rcvif; 451 ip6 = mtod(m, struct ip6_hdr *); 452 goto hbhcheck; 453 } 454 455 /* 456 * mbuf statistics 457 */ 458 if (m->m_flags & M_EXT) { 459 if (m->m_next) 460 IP6STAT_INC(ip6s_mext2m); 461 else 462 IP6STAT_INC(ip6s_mext1); 463 } else { 464 if (m->m_next) { 465 if (m->m_flags & M_LOOP) { 466 IP6STAT_INC(ip6s_m2m[V_loif->if_index]); 467 } else if (m->m_pkthdr.rcvif->if_index < IP6S_M2MMAX) 468 IP6STAT_INC( 469 ip6s_m2m[m->m_pkthdr.rcvif->if_index]); 470 else 471 IP6STAT_INC(ip6s_m2m[0]); 472 } else 473 IP6STAT_INC(ip6s_m1); 474 } 475 476 /* drop the packet if IPv6 operation is disabled on the IF */ 477 if ((ND_IFINFO(m->m_pkthdr.rcvif)->flags & ND6_IFF_IFDISABLED)) { 478 m_freem(m); 479 return; 480 } 481 482 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive); 483 IP6STAT_INC(ip6s_total); 484 485 #ifndef PULLDOWN_TEST 486 /* 487 * L2 bridge code and some other code can return mbuf chain 488 * that does not conform to KAME requirement. too bad. 489 * XXX: fails to join if interface MTU > MCLBYTES. jumbogram? 490 */ 491 if (m && m->m_next != NULL && m->m_pkthdr.len < MCLBYTES) { 492 struct mbuf *n; 493 494 MGETHDR(n, M_DONTWAIT, MT_HEADER); 495 if (n) 496 M_MOVE_PKTHDR(n, m); 497 if (n && n->m_pkthdr.len > MHLEN) { 498 MCLGET(n, M_DONTWAIT); 499 if ((n->m_flags & M_EXT) == 0) { 500 m_freem(n); 501 n = NULL; 502 } 503 } 504 if (n == NULL) { 505 m_freem(m); 506 return; /* ENOBUFS */ 507 } 508 509 m_copydata(m, 0, n->m_pkthdr.len, mtod(n, caddr_t)); 510 n->m_len = n->m_pkthdr.len; 511 m_freem(m); 512 m = n; 513 } 514 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), /* nothing */); 515 #endif 516 517 if (m->m_len < sizeof(struct ip6_hdr)) { 518 struct ifnet *inifp; 519 inifp = m->m_pkthdr.rcvif; 520 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 521 IP6STAT_INC(ip6s_toosmall); 522 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 523 return; 524 } 525 } 526 527 ip6 = mtod(m, struct ip6_hdr *); 528 529 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 530 IP6STAT_INC(ip6s_badvers); 531 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 532 goto bad; 533 } 534 535 IP6STAT_INC(ip6s_nxthist[ip6->ip6_nxt]); 536 537 /* 538 * Check against address spoofing/corruption. 539 */ 540 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) || 541 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) { 542 /* 543 * XXX: "badscope" is not very suitable for a multicast source. 544 */ 545 IP6STAT_INC(ip6s_badscope); 546 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 547 goto bad; 548 } 549 if (IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) && 550 !(m->m_flags & M_LOOP)) { 551 /* 552 * In this case, the packet should come from the loopback 553 * interface. However, we cannot just check the if_flags, 554 * because ip6_mloopback() passes the "actual" interface 555 * as the outgoing/incoming interface. 556 */ 557 IP6STAT_INC(ip6s_badscope); 558 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 559 goto bad; 560 } 561 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && 562 IPV6_ADDR_MC_SCOPE(&ip6->ip6_dst) == 0) { 563 /* 564 * RFC4291 2.7: 565 * Nodes must not originate a packet to a multicast address 566 * whose scop field contains the reserved value 0; if such 567 * a packet is received, it must be silently dropped. 568 */ 569 IP6STAT_INC(ip6s_badscope); 570 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 571 goto bad; 572 } 573 #ifdef ALTQ 574 if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) { 575 /* packet is dropped by traffic conditioner */ 576 return; 577 } 578 #endif 579 /* 580 * The following check is not documented in specs. A malicious 581 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack 582 * and bypass security checks (act as if it was from 127.0.0.1 by using 583 * IPv6 src ::ffff:127.0.0.1). Be cautious. 584 * 585 * This check chokes if we are in an SIIT cloud. As none of BSDs 586 * support IPv4-less kernel compilation, we cannot support SIIT 587 * environment at all. So, it makes more sense for us to reject any 588 * malicious packets for non-SIIT environment, than try to do a 589 * partial support for SIIT environment. 590 */ 591 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 592 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 593 IP6STAT_INC(ip6s_badscope); 594 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 595 goto bad; 596 } 597 #if 0 598 /* 599 * Reject packets with IPv4 compatible addresses (auto tunnel). 600 * 601 * The code forbids auto tunnel relay case in RFC1933 (the check is 602 * stronger than RFC1933). We may want to re-enable it if mech-xx 603 * is revised to forbid relaying case. 604 */ 605 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) || 606 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) { 607 IP6STAT_INC(ip6s_badscope); 608 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 609 goto bad; 610 } 611 #endif 612 #ifdef IPSEC 613 /* 614 * Bypass packet filtering for packets previously handled by IPsec. 615 */ 616 if (ip6_ipsec_filtertunnel(m)) 617 goto passin; 618 #endif /* IPSEC */ 619 620 /* 621 * Run through list of hooks for input packets. 622 * 623 * NB: Beware of the destination address changing 624 * (e.g. by NAT rewriting). When this happens, 625 * tell ip6_forward to do the right thing. 626 */ 627 odst = ip6->ip6_dst; 628 629 /* Jump over all PFIL processing if hooks are not active. */ 630 if (!PFIL_HOOKED(&V_inet6_pfil_hook)) 631 goto passin; 632 633 if (pfil_run_hooks(&V_inet6_pfil_hook, &m, 634 m->m_pkthdr.rcvif, PFIL_IN, NULL)) 635 return; 636 if (m == NULL) /* consumed by filter */ 637 return; 638 ip6 = mtod(m, struct ip6_hdr *); 639 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst); 640 641 if (m->m_flags & M_FASTFWD_OURS) { 642 m->m_flags &= ~M_FASTFWD_OURS; 643 ours = 1; 644 deliverifp = m->m_pkthdr.rcvif; 645 goto hbhcheck; 646 } 647 if ((m->m_flags & M_IP6_NEXTHOP) && 648 m_tag_find(m, PACKET_TAG_IPFORWARD, NULL) != NULL) { 649 /* 650 * Directly ship the packet on. This allows forwarding 651 * packets originally destined to us to some other directly 652 * connected host. 653 */ 654 ip6_forward(m, 1); 655 goto out; 656 } 657 658 passin: 659 /* 660 * Disambiguate address scope zones (if there is ambiguity). 661 * We first make sure that the original source or destination address 662 * is not in our internal form for scoped addresses. Such addresses 663 * are not necessarily invalid spec-wise, but we cannot accept them due 664 * to the usage conflict. 665 * in6_setscope() then also checks and rejects the cases where src or 666 * dst are the loopback address and the receiving interface 667 * is not loopback. 668 */ 669 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) { 670 IP6STAT_INC(ip6s_badscope); /* XXX */ 671 goto bad; 672 } 673 if (in6_setscope(&ip6->ip6_src, m->m_pkthdr.rcvif, NULL) || 674 in6_setscope(&ip6->ip6_dst, m->m_pkthdr.rcvif, NULL)) { 675 IP6STAT_INC(ip6s_badscope); 676 goto bad; 677 } 678 679 /* 680 * Multicast check. Assume packet is for us to avoid 681 * prematurely taking locks. 682 */ 683 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 684 ours = 1; 685 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast); 686 deliverifp = m->m_pkthdr.rcvif; 687 goto hbhcheck; 688 } 689 690 /* 691 * Unicast check 692 */ 693 694 bzero(&dst6, sizeof(dst6)); 695 dst6.sin6_family = AF_INET6; 696 dst6.sin6_len = sizeof(struct sockaddr_in6); 697 dst6.sin6_addr = ip6->ip6_dst; 698 ifp = m->m_pkthdr.rcvif; 699 IF_AFDATA_RLOCK(ifp); 700 lle = lla_lookup(LLTABLE6(ifp), 0, 701 (struct sockaddr *)&dst6); 702 IF_AFDATA_RUNLOCK(ifp); 703 if ((lle != NULL) && (lle->la_flags & LLE_IFADDR)) { 704 struct ifaddr *ifa; 705 struct in6_ifaddr *ia6; 706 int bad; 707 708 bad = 1; 709 #define sa_equal(a1, a2) \ 710 (bcmp((a1), (a2), ((a1))->sin6_len) == 0) 711 IF_ADDR_RLOCK(ifp); 712 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 713 if (ifa->ifa_addr->sa_family != dst6.sin6_family) 714 continue; 715 if (sa_equal(&dst6, ifa->ifa_addr)) 716 break; 717 } 718 KASSERT(ifa != NULL, ("%s: ifa not found for lle %p", 719 __func__, lle)); 720 #undef sa_equal 721 722 ia6 = (struct in6_ifaddr *)ifa; 723 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) { 724 /* Count the packet in the ip address stats */ 725 ia6->ia_ifa.if_ipackets++; 726 ia6->ia_ifa.if_ibytes += m->m_pkthdr.len; 727 728 /* 729 * record address information into m_tag. 730 */ 731 (void)ip6_setdstifaddr(m, ia6); 732 733 bad = 0; 734 } else { 735 char ip6bufs[INET6_ADDRSTRLEN]; 736 char ip6bufd[INET6_ADDRSTRLEN]; 737 /* address is not ready, so discard the packet. */ 738 nd6log((LOG_INFO, 739 "ip6_input: packet to an unready address %s->%s\n", 740 ip6_sprintf(ip6bufs, &ip6->ip6_src), 741 ip6_sprintf(ip6bufd, &ip6->ip6_dst))); 742 } 743 IF_ADDR_RUNLOCK(ifp); 744 LLE_RUNLOCK(lle); 745 if (bad) 746 goto bad; 747 else { 748 ours = 1; 749 deliverifp = ifp; 750 goto hbhcheck; 751 } 752 } 753 if (lle != NULL) 754 LLE_RUNLOCK(lle); 755 756 dst = &rin6.ro_dst; 757 dst->sin6_len = sizeof(struct sockaddr_in6); 758 dst->sin6_family = AF_INET6; 759 dst->sin6_addr = ip6->ip6_dst; 760 rin6.ro_rt = in6_rtalloc1((struct sockaddr *)dst, 0, 0, M_GETFIB(m)); 761 if (rin6.ro_rt) 762 RT_UNLOCK(rin6.ro_rt); 763 764 #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key)) 765 766 /* 767 * Accept the packet if the forwarding interface to the destination 768 * according to the routing table is the loopback interface, 769 * unless the associated route has a gateway. 770 * Note that this approach causes to accept a packet if there is a 771 * route to the loopback interface for the destination of the packet. 772 * But we think it's even useful in some situations, e.g. when using 773 * a special daemon which wants to intercept the packet. 774 * 775 * XXX: some OSes automatically make a cloned route for the destination 776 * of an outgoing packet. If the outgoing interface of the packet 777 * is a loopback one, the kernel would consider the packet to be 778 * accepted, even if we have no such address assinged on the interface. 779 * We check the cloned flag of the route entry to reject such cases, 780 * assuming that route entries for our own addresses are not made by 781 * cloning (it should be true because in6_addloop explicitly installs 782 * the host route). However, we might have to do an explicit check 783 * while it would be less efficient. Or, should we rather install a 784 * reject route for such a case? 785 */ 786 if (rin6.ro_rt && 787 (rin6.ro_rt->rt_flags & 788 (RTF_HOST|RTF_GATEWAY)) == RTF_HOST && 789 #ifdef RTF_WASCLONED 790 !(rin6.ro_rt->rt_flags & RTF_WASCLONED) && 791 #endif 792 #ifdef RTF_CLONED 793 !(rin6.ro_rt->rt_flags & RTF_CLONED) && 794 #endif 795 #if 0 796 /* 797 * The check below is redundant since the comparison of 798 * the destination and the key of the rtentry has 799 * already done through looking up the routing table. 800 */ 801 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 802 &rt6_key(rin6.ro_rt)->sin6_addr) 803 #endif 804 rin6.ro_rt->rt_ifp->if_type == IFT_LOOP) { 805 int free_ia6 = 0; 806 struct in6_ifaddr *ia6; 807 808 /* 809 * found the loopback route to the interface address 810 */ 811 if (rin6.ro_rt->rt_gateway->sa_family == AF_LINK) { 812 struct sockaddr_in6 dest6; 813 814 bzero(&dest6, sizeof(dest6)); 815 dest6.sin6_family = AF_INET6; 816 dest6.sin6_len = sizeof(dest6); 817 dest6.sin6_addr = ip6->ip6_dst; 818 ia6 = (struct in6_ifaddr *) 819 ifa_ifwithaddr((struct sockaddr *)&dest6); 820 if (ia6 == NULL) 821 goto bad; 822 free_ia6 = 1; 823 } 824 else 825 ia6 = (struct in6_ifaddr *)rin6.ro_rt->rt_ifa; 826 827 /* 828 * record address information into m_tag. 829 */ 830 (void)ip6_setdstifaddr(m, ia6); 831 832 /* 833 * packets to a tentative, duplicated, or somehow invalid 834 * address must not be accepted. 835 */ 836 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) { 837 /* this address is ready */ 838 ours = 1; 839 deliverifp = ia6->ia_ifp; /* correct? */ 840 /* Count the packet in the ip address stats */ 841 ia6->ia_ifa.if_ipackets++; 842 ia6->ia_ifa.if_ibytes += m->m_pkthdr.len; 843 if (ia6 != NULL && free_ia6 != 0) 844 ifa_free(&ia6->ia_ifa); 845 goto hbhcheck; 846 } else { 847 char ip6bufs[INET6_ADDRSTRLEN]; 848 char ip6bufd[INET6_ADDRSTRLEN]; 849 /* address is not ready, so discard the packet. */ 850 nd6log((LOG_INFO, 851 "ip6_input: packet to an unready address %s->%s\n", 852 ip6_sprintf(ip6bufs, &ip6->ip6_src), 853 ip6_sprintf(ip6bufd, &ip6->ip6_dst))); 854 855 if (ia6 != NULL && free_ia6 != 0) 856 ifa_free(&ia6->ia_ifa); 857 goto bad; 858 } 859 } 860 861 /* 862 * FAITH (Firewall Aided Internet Translator) 863 */ 864 if (V_ip6_keepfaith) { 865 if (rin6.ro_rt && rin6.ro_rt->rt_ifp && 866 rin6.ro_rt->rt_ifp->if_type == IFT_FAITH) { 867 /* XXX do we need more sanity checks? */ 868 ours = 1; 869 deliverifp = rin6.ro_rt->rt_ifp; /* faith */ 870 goto hbhcheck; 871 } 872 } 873 874 /* 875 * Now there is no reason to process the packet if it's not our own 876 * and we're not a router. 877 */ 878 if (!V_ip6_forwarding) { 879 IP6STAT_INC(ip6s_cantforward); 880 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 881 goto bad; 882 } 883 884 hbhcheck: 885 /* 886 * record address information into m_tag, if we don't have one yet. 887 * note that we are unable to record it, if the address is not listed 888 * as our interface address (e.g. multicast addresses, addresses 889 * within FAITH prefixes and such). 890 */ 891 if (deliverifp) { 892 struct in6_ifaddr *ia6; 893 894 if ((ia6 = ip6_getdstifaddr(m)) != NULL) { 895 ifa_free(&ia6->ia_ifa); 896 } else { 897 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 898 if (ia6) { 899 if (!ip6_setdstifaddr(m, ia6)) { 900 /* 901 * XXX maybe we should drop the packet here, 902 * as we could not provide enough information 903 * to the upper layers. 904 */ 905 } 906 ifa_free(&ia6->ia_ifa); 907 } 908 } 909 } 910 911 /* 912 * Process Hop-by-Hop options header if it's contained. 913 * m may be modified in ip6_hopopts_input(). 914 * If a JumboPayload option is included, plen will also be modified. 915 */ 916 plen = (u_int32_t)ntohs(ip6->ip6_plen); 917 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 918 int error; 919 920 error = ip6_input_hbh(m, &plen, &rtalert, &off, &nxt, &ours); 921 if (error != 0) 922 goto out; 923 } else 924 nxt = ip6->ip6_nxt; 925 926 /* 927 * Check that the amount of data in the buffers 928 * is as at least much as the IPv6 header would have us expect. 929 * Trim mbufs if longer than we expect. 930 * Drop packet if shorter than we expect. 931 */ 932 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 933 IP6STAT_INC(ip6s_tooshort); 934 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 935 goto bad; 936 } 937 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 938 if (m->m_len == m->m_pkthdr.len) { 939 m->m_len = sizeof(struct ip6_hdr) + plen; 940 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 941 } else 942 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 943 } 944 945 /* 946 * Forward if desirable. 947 */ 948 if (V_ip6_mrouter && 949 IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 950 /* 951 * If we are acting as a multicast router, all 952 * incoming multicast packets are passed to the 953 * kernel-level multicast forwarding function. 954 * The packet is returned (relatively) intact; if 955 * ip6_mforward() returns a non-zero value, the packet 956 * must be discarded, else it may be accepted below. 957 * 958 * XXX TODO: Check hlim and multicast scope here to avoid 959 * unnecessarily calling into ip6_mforward(). 960 */ 961 if (ip6_mforward && 962 ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) { 963 IP6STAT_INC(ip6s_cantforward); 964 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 965 goto bad; 966 } 967 } else if (!ours) { 968 ip6_forward(m, srcrt); 969 goto out; 970 } 971 972 ip6 = mtod(m, struct ip6_hdr *); 973 974 /* 975 * Malicious party may be able to use IPv4 mapped addr to confuse 976 * tcp/udp stack and bypass security checks (act as if it was from 977 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious. 978 * 979 * For SIIT end node behavior, you may want to disable the check. 980 * However, you will become vulnerable to attacks using IPv4 mapped 981 * source. 982 */ 983 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 984 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 985 IP6STAT_INC(ip6s_badscope); 986 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 987 goto bad; 988 } 989 990 /* 991 * Tell launch routine the next header 992 */ 993 IP6STAT_INC(ip6s_delivered); 994 in6_ifstat_inc(deliverifp, ifs6_in_deliver); 995 nest = 0; 996 997 while (nxt != IPPROTO_DONE) { 998 if (V_ip6_hdrnestlimit && (++nest > V_ip6_hdrnestlimit)) { 999 IP6STAT_INC(ip6s_toomanyhdr); 1000 goto bad; 1001 } 1002 1003 /* 1004 * protection against faulty packet - there should be 1005 * more sanity checks in header chain processing. 1006 */ 1007 if (m->m_pkthdr.len < off) { 1008 IP6STAT_INC(ip6s_tooshort); 1009 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 1010 goto bad; 1011 } 1012 1013 #ifdef IPSEC 1014 /* 1015 * enforce IPsec policy checking if we are seeing last header. 1016 * note that we do not visit this with protocols with pcb layer 1017 * code - like udp/tcp/raw ip. 1018 */ 1019 if (ip6_ipsec_input(m, nxt)) 1020 goto bad; 1021 #endif /* IPSEC */ 1022 1023 /* 1024 * Use mbuf flags to propagate Router Alert option to 1025 * ICMPv6 layer, as hop-by-hop options have been stripped. 1026 */ 1027 if (nxt == IPPROTO_ICMPV6 && rtalert != ~0) 1028 m->m_flags |= M_RTALERT_MLD; 1029 1030 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt); 1031 } 1032 goto out; 1033 bad: 1034 m_freem(m); 1035 out: 1036 if (rin6.ro_rt) 1037 RTFREE(rin6.ro_rt); 1038 } 1039 1040 /* 1041 * set/grab in6_ifaddr correspond to IPv6 destination address. 1042 * XXX backward compatibility wrapper 1043 * 1044 * XXXRW: We should bump the refcount on ia6 before sticking it in the m_tag, 1045 * and then bump it when the tag is copied, and release it when the tag is 1046 * freed. Unfortunately, m_tags don't support deep copies (yet), so instead 1047 * we just bump the ia refcount when we receive it. This should be fixed. 1048 */ 1049 static struct ip6aux * 1050 ip6_setdstifaddr(struct mbuf *m, struct in6_ifaddr *ia6) 1051 { 1052 struct ip6aux *ip6a; 1053 1054 ip6a = ip6_addaux(m); 1055 if (ip6a) 1056 ip6a->ip6a_dstia6 = ia6; 1057 return ip6a; /* NULL if failed to set */ 1058 } 1059 1060 struct in6_ifaddr * 1061 ip6_getdstifaddr(struct mbuf *m) 1062 { 1063 struct ip6aux *ip6a; 1064 struct in6_ifaddr *ia; 1065 1066 ip6a = ip6_findaux(m); 1067 if (ip6a) { 1068 ia = ip6a->ip6a_dstia6; 1069 ifa_ref(&ia->ia_ifa); 1070 return ia; 1071 } else 1072 return NULL; 1073 } 1074 1075 /* 1076 * Hop-by-Hop options header processing. If a valid jumbo payload option is 1077 * included, the real payload length will be stored in plenp. 1078 * 1079 * rtalertp - XXX: should be stored more smart way 1080 */ 1081 static int 1082 ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp, 1083 struct mbuf **mp, int *offp) 1084 { 1085 struct mbuf *m = *mp; 1086 int off = *offp, hbhlen; 1087 struct ip6_hbh *hbh; 1088 1089 /* validation of the length of the header */ 1090 #ifndef PULLDOWN_TEST 1091 IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1); 1092 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); 1093 hbhlen = (hbh->ip6h_len + 1) << 3; 1094 1095 IP6_EXTHDR_CHECK(m, off, hbhlen, -1); 1096 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); 1097 #else 1098 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, 1099 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh)); 1100 if (hbh == NULL) { 1101 IP6STAT_INC(ip6s_tooshort); 1102 return -1; 1103 } 1104 hbhlen = (hbh->ip6h_len + 1) << 3; 1105 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 1106 hbhlen); 1107 if (hbh == NULL) { 1108 IP6STAT_INC(ip6s_tooshort); 1109 return -1; 1110 } 1111 #endif 1112 off += hbhlen; 1113 hbhlen -= sizeof(struct ip6_hbh); 1114 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 1115 hbhlen, rtalertp, plenp) < 0) 1116 return (-1); 1117 1118 *offp = off; 1119 *mp = m; 1120 return (0); 1121 } 1122 1123 /* 1124 * Search header for all Hop-by-hop options and process each option. 1125 * This function is separate from ip6_hopopts_input() in order to 1126 * handle a case where the sending node itself process its hop-by-hop 1127 * options header. In such a case, the function is called from ip6_output(). 1128 * 1129 * The function assumes that hbh header is located right after the IPv6 header 1130 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to 1131 * opthead + hbhlen is located in contiguous memory region. 1132 */ 1133 int 1134 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen, 1135 u_int32_t *rtalertp, u_int32_t *plenp) 1136 { 1137 struct ip6_hdr *ip6; 1138 int optlen = 0; 1139 u_int8_t *opt = opthead; 1140 u_int16_t rtalert_val; 1141 u_int32_t jumboplen; 1142 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh); 1143 1144 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 1145 switch (*opt) { 1146 case IP6OPT_PAD1: 1147 optlen = 1; 1148 break; 1149 case IP6OPT_PADN: 1150 if (hbhlen < IP6OPT_MINLEN) { 1151 IP6STAT_INC(ip6s_toosmall); 1152 goto bad; 1153 } 1154 optlen = *(opt + 1) + 2; 1155 break; 1156 case IP6OPT_ROUTER_ALERT: 1157 /* XXX may need check for alignment */ 1158 if (hbhlen < IP6OPT_RTALERT_LEN) { 1159 IP6STAT_INC(ip6s_toosmall); 1160 goto bad; 1161 } 1162 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) { 1163 /* XXX stat */ 1164 icmp6_error(m, ICMP6_PARAM_PROB, 1165 ICMP6_PARAMPROB_HEADER, 1166 erroff + opt + 1 - opthead); 1167 return (-1); 1168 } 1169 optlen = IP6OPT_RTALERT_LEN; 1170 bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2); 1171 *rtalertp = ntohs(rtalert_val); 1172 break; 1173 case IP6OPT_JUMBO: 1174 /* XXX may need check for alignment */ 1175 if (hbhlen < IP6OPT_JUMBO_LEN) { 1176 IP6STAT_INC(ip6s_toosmall); 1177 goto bad; 1178 } 1179 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) { 1180 /* XXX stat */ 1181 icmp6_error(m, ICMP6_PARAM_PROB, 1182 ICMP6_PARAMPROB_HEADER, 1183 erroff + opt + 1 - opthead); 1184 return (-1); 1185 } 1186 optlen = IP6OPT_JUMBO_LEN; 1187 1188 /* 1189 * IPv6 packets that have non 0 payload length 1190 * must not contain a jumbo payload option. 1191 */ 1192 ip6 = mtod(m, struct ip6_hdr *); 1193 if (ip6->ip6_plen) { 1194 IP6STAT_INC(ip6s_badoptions); 1195 icmp6_error(m, ICMP6_PARAM_PROB, 1196 ICMP6_PARAMPROB_HEADER, 1197 erroff + opt - opthead); 1198 return (-1); 1199 } 1200 1201 /* 1202 * We may see jumbolen in unaligned location, so 1203 * we'd need to perform bcopy(). 1204 */ 1205 bcopy(opt + 2, &jumboplen, sizeof(jumboplen)); 1206 jumboplen = (u_int32_t)htonl(jumboplen); 1207 1208 #if 1 1209 /* 1210 * if there are multiple jumbo payload options, 1211 * *plenp will be non-zero and the packet will be 1212 * rejected. 1213 * the behavior may need some debate in ipngwg - 1214 * multiple options does not make sense, however, 1215 * there's no explicit mention in specification. 1216 */ 1217 if (*plenp != 0) { 1218 IP6STAT_INC(ip6s_badoptions); 1219 icmp6_error(m, ICMP6_PARAM_PROB, 1220 ICMP6_PARAMPROB_HEADER, 1221 erroff + opt + 2 - opthead); 1222 return (-1); 1223 } 1224 #endif 1225 1226 /* 1227 * jumbo payload length must be larger than 65535. 1228 */ 1229 if (jumboplen <= IPV6_MAXPACKET) { 1230 IP6STAT_INC(ip6s_badoptions); 1231 icmp6_error(m, ICMP6_PARAM_PROB, 1232 ICMP6_PARAMPROB_HEADER, 1233 erroff + opt + 2 - opthead); 1234 return (-1); 1235 } 1236 *plenp = jumboplen; 1237 1238 break; 1239 default: /* unknown option */ 1240 if (hbhlen < IP6OPT_MINLEN) { 1241 IP6STAT_INC(ip6s_toosmall); 1242 goto bad; 1243 } 1244 optlen = ip6_unknown_opt(opt, m, 1245 erroff + opt - opthead); 1246 if (optlen == -1) 1247 return (-1); 1248 optlen += 2; 1249 break; 1250 } 1251 } 1252 1253 return (0); 1254 1255 bad: 1256 m_freem(m); 1257 return (-1); 1258 } 1259 1260 /* 1261 * Unknown option processing. 1262 * The third argument `off' is the offset from the IPv6 header to the option, 1263 * which is necessary if the IPv6 header the and option header and IPv6 header 1264 * is not contiguous in order to return an ICMPv6 error. 1265 */ 1266 int 1267 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off) 1268 { 1269 struct ip6_hdr *ip6; 1270 1271 switch (IP6OPT_TYPE(*optp)) { 1272 case IP6OPT_TYPE_SKIP: /* ignore the option */ 1273 return ((int)*(optp + 1)); 1274 case IP6OPT_TYPE_DISCARD: /* silently discard */ 1275 m_freem(m); 1276 return (-1); 1277 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 1278 IP6STAT_INC(ip6s_badoptions); 1279 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 1280 return (-1); 1281 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 1282 IP6STAT_INC(ip6s_badoptions); 1283 ip6 = mtod(m, struct ip6_hdr *); 1284 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 1285 (m->m_flags & (M_BCAST|M_MCAST))) 1286 m_freem(m); 1287 else 1288 icmp6_error(m, ICMP6_PARAM_PROB, 1289 ICMP6_PARAMPROB_OPTION, off); 1290 return (-1); 1291 } 1292 1293 m_freem(m); /* XXX: NOTREACHED */ 1294 return (-1); 1295 } 1296 1297 /* 1298 * Create the "control" list for this pcb. 1299 * These functions will not modify mbuf chain at all. 1300 * 1301 * With KAME mbuf chain restriction: 1302 * The routine will be called from upper layer handlers like tcp6_input(). 1303 * Thus the routine assumes that the caller (tcp6_input) have already 1304 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the 1305 * very first mbuf on the mbuf chain. 1306 * 1307 * ip6_savecontrol_v4 will handle those options that are possible to be 1308 * set on a v4-mapped socket. 1309 * ip6_savecontrol will directly call ip6_savecontrol_v4 to handle those 1310 * options and handle the v6-only ones itself. 1311 */ 1312 struct mbuf ** 1313 ip6_savecontrol_v4(struct inpcb *inp, struct mbuf *m, struct mbuf **mp, 1314 int *v4only) 1315 { 1316 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1317 1318 #ifdef SO_TIMESTAMP 1319 if ((inp->inp_socket->so_options & SO_TIMESTAMP) != 0) { 1320 struct timeval tv; 1321 1322 microtime(&tv); 1323 *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv), 1324 SCM_TIMESTAMP, SOL_SOCKET); 1325 if (*mp) 1326 mp = &(*mp)->m_next; 1327 } 1328 #endif 1329 1330 #define IS2292(inp, x, y) (((inp)->inp_flags & IN6P_RFC2292) ? (x) : (y)) 1331 /* RFC 2292 sec. 5 */ 1332 if ((inp->inp_flags & IN6P_PKTINFO) != 0) { 1333 struct in6_pktinfo pi6; 1334 1335 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1336 #ifdef INET 1337 struct ip *ip; 1338 1339 ip = mtod(m, struct ip *); 1340 pi6.ipi6_addr.s6_addr32[0] = 0; 1341 pi6.ipi6_addr.s6_addr32[1] = 0; 1342 pi6.ipi6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP; 1343 pi6.ipi6_addr.s6_addr32[3] = ip->ip_dst.s_addr; 1344 #else 1345 /* We won't hit this code */ 1346 bzero(&pi6.ipi6_addr, sizeof(struct in6_addr)); 1347 #endif 1348 } else { 1349 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr)); 1350 in6_clearscope(&pi6.ipi6_addr); /* XXX */ 1351 } 1352 pi6.ipi6_ifindex = 1353 (m && m->m_pkthdr.rcvif) ? m->m_pkthdr.rcvif->if_index : 0; 1354 1355 *mp = sbcreatecontrol((caddr_t) &pi6, 1356 sizeof(struct in6_pktinfo), 1357 IS2292(inp, IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6); 1358 if (*mp) 1359 mp = &(*mp)->m_next; 1360 } 1361 1362 if ((inp->inp_flags & IN6P_HOPLIMIT) != 0) { 1363 int hlim; 1364 1365 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1366 #ifdef INET 1367 struct ip *ip; 1368 1369 ip = mtod(m, struct ip *); 1370 hlim = ip->ip_ttl; 1371 #else 1372 /* We won't hit this code */ 1373 hlim = 0; 1374 #endif 1375 } else { 1376 hlim = ip6->ip6_hlim & 0xff; 1377 } 1378 *mp = sbcreatecontrol((caddr_t) &hlim, sizeof(int), 1379 IS2292(inp, IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), 1380 IPPROTO_IPV6); 1381 if (*mp) 1382 mp = &(*mp)->m_next; 1383 } 1384 1385 if ((inp->inp_flags & IN6P_TCLASS) != 0) { 1386 int tclass; 1387 1388 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1389 #ifdef INET 1390 struct ip *ip; 1391 1392 ip = mtod(m, struct ip *); 1393 tclass = ip->ip_tos; 1394 #else 1395 /* We won't hit this code */ 1396 tclass = 0; 1397 #endif 1398 } else { 1399 u_int32_t flowinfo; 1400 1401 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK); 1402 flowinfo >>= 20; 1403 tclass = flowinfo & 0xff; 1404 } 1405 *mp = sbcreatecontrol((caddr_t) &tclass, sizeof(int), 1406 IPV6_TCLASS, IPPROTO_IPV6); 1407 if (*mp) 1408 mp = &(*mp)->m_next; 1409 } 1410 1411 if (v4only != NULL) { 1412 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1413 *v4only = 1; 1414 } else { 1415 *v4only = 0; 1416 } 1417 } 1418 1419 return (mp); 1420 } 1421 1422 void 1423 ip6_savecontrol(struct inpcb *in6p, struct mbuf *m, struct mbuf **mp) 1424 { 1425 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1426 int v4only = 0; 1427 1428 mp = ip6_savecontrol_v4(in6p, m, mp, &v4only); 1429 if (v4only) 1430 return; 1431 1432 /* 1433 * IPV6_HOPOPTS socket option. Recall that we required super-user 1434 * privilege for the option (see ip6_ctloutput), but it might be too 1435 * strict, since there might be some hop-by-hop options which can be 1436 * returned to normal user. 1437 * See also RFC 2292 section 6 (or RFC 3542 section 8). 1438 */ 1439 if ((in6p->inp_flags & IN6P_HOPOPTS) != 0) { 1440 /* 1441 * Check if a hop-by-hop options header is contatined in the 1442 * received packet, and if so, store the options as ancillary 1443 * data. Note that a hop-by-hop options header must be 1444 * just after the IPv6 header, which is assured through the 1445 * IPv6 input processing. 1446 */ 1447 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 1448 struct ip6_hbh *hbh; 1449 int hbhlen = 0; 1450 #ifdef PULLDOWN_TEST 1451 struct mbuf *ext; 1452 #endif 1453 1454 #ifndef PULLDOWN_TEST 1455 hbh = (struct ip6_hbh *)(ip6 + 1); 1456 hbhlen = (hbh->ip6h_len + 1) << 3; 1457 #else 1458 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr), 1459 ip6->ip6_nxt); 1460 if (ext == NULL) { 1461 IP6STAT_INC(ip6s_tooshort); 1462 return; 1463 } 1464 hbh = mtod(ext, struct ip6_hbh *); 1465 hbhlen = (hbh->ip6h_len + 1) << 3; 1466 if (hbhlen != ext->m_len) { 1467 m_freem(ext); 1468 IP6STAT_INC(ip6s_tooshort); 1469 return; 1470 } 1471 #endif 1472 1473 /* 1474 * XXX: We copy the whole header even if a 1475 * jumbo payload option is included, the option which 1476 * is to be removed before returning according to 1477 * RFC2292. 1478 * Note: this constraint is removed in RFC3542 1479 */ 1480 *mp = sbcreatecontrol((caddr_t)hbh, hbhlen, 1481 IS2292(in6p, IPV6_2292HOPOPTS, IPV6_HOPOPTS), 1482 IPPROTO_IPV6); 1483 if (*mp) 1484 mp = &(*mp)->m_next; 1485 #ifdef PULLDOWN_TEST 1486 m_freem(ext); 1487 #endif 1488 } 1489 } 1490 1491 if ((in6p->inp_flags & (IN6P_RTHDR | IN6P_DSTOPTS)) != 0) { 1492 int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr); 1493 1494 /* 1495 * Search for destination options headers or routing 1496 * header(s) through the header chain, and stores each 1497 * header as ancillary data. 1498 * Note that the order of the headers remains in 1499 * the chain of ancillary data. 1500 */ 1501 while (1) { /* is explicit loop prevention necessary? */ 1502 struct ip6_ext *ip6e = NULL; 1503 int elen; 1504 #ifdef PULLDOWN_TEST 1505 struct mbuf *ext = NULL; 1506 #endif 1507 1508 /* 1509 * if it is not an extension header, don't try to 1510 * pull it from the chain. 1511 */ 1512 switch (nxt) { 1513 case IPPROTO_DSTOPTS: 1514 case IPPROTO_ROUTING: 1515 case IPPROTO_HOPOPTS: 1516 case IPPROTO_AH: /* is it possible? */ 1517 break; 1518 default: 1519 goto loopend; 1520 } 1521 1522 #ifndef PULLDOWN_TEST 1523 if (off + sizeof(*ip6e) > m->m_len) 1524 goto loopend; 1525 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off); 1526 if (nxt == IPPROTO_AH) 1527 elen = (ip6e->ip6e_len + 2) << 2; 1528 else 1529 elen = (ip6e->ip6e_len + 1) << 3; 1530 if (off + elen > m->m_len) 1531 goto loopend; 1532 #else 1533 ext = ip6_pullexthdr(m, off, nxt); 1534 if (ext == NULL) { 1535 IP6STAT_INC(ip6s_tooshort); 1536 return; 1537 } 1538 ip6e = mtod(ext, struct ip6_ext *); 1539 if (nxt == IPPROTO_AH) 1540 elen = (ip6e->ip6e_len + 2) << 2; 1541 else 1542 elen = (ip6e->ip6e_len + 1) << 3; 1543 if (elen != ext->m_len) { 1544 m_freem(ext); 1545 IP6STAT_INC(ip6s_tooshort); 1546 return; 1547 } 1548 #endif 1549 1550 switch (nxt) { 1551 case IPPROTO_DSTOPTS: 1552 if (!(in6p->inp_flags & IN6P_DSTOPTS)) 1553 break; 1554 1555 *mp = sbcreatecontrol((caddr_t)ip6e, elen, 1556 IS2292(in6p, 1557 IPV6_2292DSTOPTS, IPV6_DSTOPTS), 1558 IPPROTO_IPV6); 1559 if (*mp) 1560 mp = &(*mp)->m_next; 1561 break; 1562 case IPPROTO_ROUTING: 1563 if (!(in6p->inp_flags & IN6P_RTHDR)) 1564 break; 1565 1566 *mp = sbcreatecontrol((caddr_t)ip6e, elen, 1567 IS2292(in6p, IPV6_2292RTHDR, IPV6_RTHDR), 1568 IPPROTO_IPV6); 1569 if (*mp) 1570 mp = &(*mp)->m_next; 1571 break; 1572 case IPPROTO_HOPOPTS: 1573 case IPPROTO_AH: /* is it possible? */ 1574 break; 1575 1576 default: 1577 /* 1578 * other cases have been filtered in the above. 1579 * none will visit this case. here we supply 1580 * the code just in case (nxt overwritten or 1581 * other cases). 1582 */ 1583 #ifdef PULLDOWN_TEST 1584 m_freem(ext); 1585 #endif 1586 goto loopend; 1587 1588 } 1589 1590 /* proceed with the next header. */ 1591 off += elen; 1592 nxt = ip6e->ip6e_nxt; 1593 ip6e = NULL; 1594 #ifdef PULLDOWN_TEST 1595 m_freem(ext); 1596 ext = NULL; 1597 #endif 1598 } 1599 loopend: 1600 ; 1601 } 1602 } 1603 #undef IS2292 1604 1605 void 1606 ip6_notify_pmtu(struct inpcb *inp, struct sockaddr_in6 *dst, u_int32_t mtu) 1607 { 1608 struct socket *so; 1609 struct mbuf *m_mtu; 1610 struct ip6_mtuinfo mtuctl; 1611 1612 KASSERT(inp != NULL, ("%s: inp == NULL", __func__)); 1613 /* 1614 * Notify the error by sending IPV6_PATHMTU ancillary data if 1615 * application wanted to know the MTU value. 1616 * NOTE: we notify disconnected sockets, because some udp 1617 * applications keep sending sockets disconnected. 1618 * NOTE: our implementation doesn't notify connected sockets that has 1619 * foreign address that is different than given destination addresses 1620 * (this is permitted by RFC 3542). 1621 */ 1622 if ((inp->inp_flags & IN6P_MTU) == 0 || ( 1623 !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 1624 !IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &dst->sin6_addr))) 1625 return; 1626 1627 mtuctl.ip6m_mtu = mtu; 1628 mtuctl.ip6m_addr = *dst; 1629 if (sa6_recoverscope(&mtuctl.ip6m_addr)) 1630 return; 1631 1632 if ((m_mtu = sbcreatecontrol((caddr_t)&mtuctl, sizeof(mtuctl), 1633 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL) 1634 return; 1635 1636 so = inp->inp_socket; 1637 if (sbappendaddr(&so->so_rcv, (struct sockaddr *)dst, NULL, m_mtu) 1638 == 0) { 1639 m_freem(m_mtu); 1640 /* XXX: should count statistics */ 1641 } else 1642 sorwakeup(so); 1643 } 1644 1645 #ifdef PULLDOWN_TEST 1646 /* 1647 * pull single extension header from mbuf chain. returns single mbuf that 1648 * contains the result, or NULL on error. 1649 */ 1650 static struct mbuf * 1651 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt) 1652 { 1653 struct ip6_ext ip6e; 1654 size_t elen; 1655 struct mbuf *n; 1656 1657 #ifdef DIAGNOSTIC 1658 switch (nxt) { 1659 case IPPROTO_DSTOPTS: 1660 case IPPROTO_ROUTING: 1661 case IPPROTO_HOPOPTS: 1662 case IPPROTO_AH: /* is it possible? */ 1663 break; 1664 default: 1665 printf("ip6_pullexthdr: invalid nxt=%d\n", nxt); 1666 } 1667 #endif 1668 1669 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1670 if (nxt == IPPROTO_AH) 1671 elen = (ip6e.ip6e_len + 2) << 2; 1672 else 1673 elen = (ip6e.ip6e_len + 1) << 3; 1674 1675 MGET(n, M_DONTWAIT, MT_DATA); 1676 if (n && elen >= MLEN) { 1677 MCLGET(n, M_DONTWAIT); 1678 if ((n->m_flags & M_EXT) == 0) { 1679 m_free(n); 1680 n = NULL; 1681 } 1682 } 1683 if (!n) 1684 return NULL; 1685 1686 n->m_len = 0; 1687 if (elen >= M_TRAILINGSPACE(n)) { 1688 m_free(n); 1689 return NULL; 1690 } 1691 1692 m_copydata(m, off, elen, mtod(n, caddr_t)); 1693 n->m_len = elen; 1694 return n; 1695 } 1696 #endif 1697 1698 /* 1699 * Get pointer to the previous header followed by the header 1700 * currently processed. 1701 * XXX: This function supposes that 1702 * M includes all headers, 1703 * the next header field and the header length field of each header 1704 * are valid, and 1705 * the sum of each header length equals to OFF. 1706 * Because of these assumptions, this function must be called very 1707 * carefully. Moreover, it will not be used in the near future when 1708 * we develop `neater' mechanism to process extension headers. 1709 */ 1710 char * 1711 ip6_get_prevhdr(struct mbuf *m, int off) 1712 { 1713 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1714 1715 if (off == sizeof(struct ip6_hdr)) 1716 return (&ip6->ip6_nxt); 1717 else { 1718 int len, nxt; 1719 struct ip6_ext *ip6e = NULL; 1720 1721 nxt = ip6->ip6_nxt; 1722 len = sizeof(struct ip6_hdr); 1723 while (len < off) { 1724 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len); 1725 1726 switch (nxt) { 1727 case IPPROTO_FRAGMENT: 1728 len += sizeof(struct ip6_frag); 1729 break; 1730 case IPPROTO_AH: 1731 len += (ip6e->ip6e_len + 2) << 2; 1732 break; 1733 default: 1734 len += (ip6e->ip6e_len + 1) << 3; 1735 break; 1736 } 1737 nxt = ip6e->ip6e_nxt; 1738 } 1739 if (ip6e) 1740 return (&ip6e->ip6e_nxt); 1741 else 1742 return NULL; 1743 } 1744 } 1745 1746 /* 1747 * get next header offset. m will be retained. 1748 */ 1749 int 1750 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp) 1751 { 1752 struct ip6_hdr ip6; 1753 struct ip6_ext ip6e; 1754 struct ip6_frag fh; 1755 1756 /* just in case */ 1757 if (m == NULL) 1758 panic("ip6_nexthdr: m == NULL"); 1759 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off) 1760 return -1; 1761 1762 switch (proto) { 1763 case IPPROTO_IPV6: 1764 if (m->m_pkthdr.len < off + sizeof(ip6)) 1765 return -1; 1766 m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6); 1767 if (nxtp) 1768 *nxtp = ip6.ip6_nxt; 1769 off += sizeof(ip6); 1770 return off; 1771 1772 case IPPROTO_FRAGMENT: 1773 /* 1774 * terminate parsing if it is not the first fragment, 1775 * it does not make sense to parse through it. 1776 */ 1777 if (m->m_pkthdr.len < off + sizeof(fh)) 1778 return -1; 1779 m_copydata(m, off, sizeof(fh), (caddr_t)&fh); 1780 /* IP6F_OFF_MASK = 0xfff8(BigEndian), 0xf8ff(LittleEndian) */ 1781 if (fh.ip6f_offlg & IP6F_OFF_MASK) 1782 return -1; 1783 if (nxtp) 1784 *nxtp = fh.ip6f_nxt; 1785 off += sizeof(struct ip6_frag); 1786 return off; 1787 1788 case IPPROTO_AH: 1789 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1790 return -1; 1791 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1792 if (nxtp) 1793 *nxtp = ip6e.ip6e_nxt; 1794 off += (ip6e.ip6e_len + 2) << 2; 1795 return off; 1796 1797 case IPPROTO_HOPOPTS: 1798 case IPPROTO_ROUTING: 1799 case IPPROTO_DSTOPTS: 1800 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1801 return -1; 1802 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1803 if (nxtp) 1804 *nxtp = ip6e.ip6e_nxt; 1805 off += (ip6e.ip6e_len + 1) << 3; 1806 return off; 1807 1808 case IPPROTO_NONE: 1809 case IPPROTO_ESP: 1810 case IPPROTO_IPCOMP: 1811 /* give up */ 1812 return -1; 1813 1814 default: 1815 return -1; 1816 } 1817 1818 return -1; 1819 } 1820 1821 /* 1822 * get offset for the last header in the chain. m will be kept untainted. 1823 */ 1824 int 1825 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp) 1826 { 1827 int newoff; 1828 int nxt; 1829 1830 if (!nxtp) { 1831 nxt = -1; 1832 nxtp = &nxt; 1833 } 1834 while (1) { 1835 newoff = ip6_nexthdr(m, off, proto, nxtp); 1836 if (newoff < 0) 1837 return off; 1838 else if (newoff < off) 1839 return -1; /* invalid */ 1840 else if (newoff == off) 1841 return newoff; 1842 1843 off = newoff; 1844 proto = *nxtp; 1845 } 1846 } 1847 1848 static struct ip6aux * 1849 ip6_addaux(struct mbuf *m) 1850 { 1851 struct m_tag *mtag; 1852 1853 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL); 1854 if (!mtag) { 1855 mtag = m_tag_get(PACKET_TAG_IPV6_INPUT, sizeof(struct ip6aux), 1856 M_NOWAIT); 1857 if (mtag) { 1858 m_tag_prepend(m, mtag); 1859 bzero(mtag + 1, sizeof(struct ip6aux)); 1860 } 1861 } 1862 return mtag ? (struct ip6aux *)(mtag + 1) : NULL; 1863 } 1864 1865 static struct ip6aux * 1866 ip6_findaux(struct mbuf *m) 1867 { 1868 struct m_tag *mtag; 1869 1870 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL); 1871 return mtag ? (struct ip6aux *)(mtag + 1) : NULL; 1872 } 1873 1874 static void 1875 ip6_delaux(struct mbuf *m) 1876 { 1877 struct m_tag *mtag; 1878 1879 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL); 1880 if (mtag) 1881 m_tag_delete(m, mtag); 1882 } 1883 1884 /* 1885 * System control for IP6 1886 */ 1887 1888 u_char inet6ctlerrmap[PRC_NCMDS] = { 1889 0, 0, 0, 0, 1890 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 1891 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 1892 EMSGSIZE, EHOSTUNREACH, 0, 0, 1893 0, 0, 0, 0, 1894 ENOPROTOOPT 1895 };
Cache object: 1f0c0df1b5bd7482e40ee9176df87034
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