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_kdtrace.h" 71 #include "opt_route.h" 72 73 #include <sys/param.h> 74 #include <sys/systm.h> 75 #include <sys/malloc.h> 76 #include <sys/mbuf.h> 77 #include <sys/proc.h> 78 #include <sys/domain.h> 79 #include <sys/protosw.h> 80 #include <sys/sdt.h> 81 #include <sys/socket.h> 82 #include <sys/socketvar.h> 83 #include <sys/errno.h> 84 #include <sys/time.h> 85 #include <sys/kernel.h> 86 #include <sys/syslog.h> 87 88 #include <net/if.h> 89 #include <net/if_types.h> 90 #include <net/if_dl.h> 91 #include <net/route.h> 92 #include <net/netisr.h> 93 #include <net/pfil.h> 94 #include <net/vnet.h> 95 96 #include <netinet/in.h> 97 #include <netinet/in_kdtrace.h> 98 #include <netinet/ip_var.h> 99 #include <netinet/in_systm.h> 100 #include <net/if_llatbl.h> 101 #ifdef INET 102 #include <netinet/ip.h> 103 #include <netinet/ip_icmp.h> 104 #endif /* INET */ 105 #include <netinet/ip6.h> 106 #include <netinet6/in6_var.h> 107 #include <netinet6/ip6_var.h> 108 #include <netinet/in_pcb.h> 109 #include <netinet/icmp6.h> 110 #include <netinet6/scope6_var.h> 111 #include <netinet6/in6_ifattach.h> 112 #include <netinet6/nd6.h> 113 114 #ifdef IPSEC 115 #include <netipsec/ipsec.h> 116 #include <netinet6/ip6_ipsec.h> 117 #include <netipsec/ipsec6.h> 118 #endif /* IPSEC */ 119 120 #include <netinet6/ip6protosw.h> 121 122 #ifdef FLOWTABLE 123 #include <net/flowtable.h> 124 VNET_DECLARE(int, ip6_output_flowtable_size); 125 #define V_ip6_output_flowtable_size VNET(ip6_output_flowtable_size) 126 #endif 127 128 extern struct domain inet6domain; 129 130 u_char ip6_protox[IPPROTO_MAX]; 131 VNET_DEFINE(struct in6_ifaddrhead, in6_ifaddrhead); 132 VNET_DEFINE(struct in6_ifaddrlisthead *, in6_ifaddrhashtbl); 133 VNET_DEFINE(u_long, in6_ifaddrhmask); 134 135 static struct netisr_handler ip6_nh = { 136 .nh_name = "ip6", 137 .nh_handler = ip6_input, 138 .nh_proto = NETISR_IPV6, 139 .nh_policy = NETISR_POLICY_FLOW, 140 }; 141 142 VNET_DECLARE(struct callout, in6_tmpaddrtimer_ch); 143 #define V_in6_tmpaddrtimer_ch VNET(in6_tmpaddrtimer_ch) 144 145 VNET_DEFINE(struct pfil_head, inet6_pfil_hook); 146 147 VNET_PCPUSTAT_DEFINE(struct ip6stat, ip6stat); 148 VNET_PCPUSTAT_SYSINIT(ip6stat); 149 #ifdef VIMAGE 150 VNET_PCPUSTAT_SYSUNINIT(ip6stat); 151 #endif /* VIMAGE */ 152 153 struct rwlock in6_ifaddr_lock; 154 RW_SYSINIT(in6_ifaddr_lock, &in6_ifaddr_lock, "in6_ifaddr_lock"); 155 156 static void ip6_init2(void *); 157 static struct ip6aux *ip6_setdstifaddr(struct mbuf *, struct in6_ifaddr *); 158 static struct ip6aux *ip6_addaux(struct mbuf *); 159 static struct ip6aux *ip6_findaux(struct mbuf *m); 160 static void ip6_delaux (struct mbuf *); 161 static int ip6_hopopts_input(u_int32_t *, u_int32_t *, struct mbuf **, int *); 162 #ifdef PULLDOWN_TEST 163 static struct mbuf *ip6_pullexthdr(struct mbuf *, size_t, int); 164 #endif 165 166 /* 167 * IP6 initialization: fill in IP6 protocol switch table. 168 * All protocols not implemented in kernel go to raw IP6 protocol handler. 169 */ 170 void 171 ip6_init(void) 172 { 173 struct ip6protosw *pr; 174 int i; 175 176 TUNABLE_INT_FETCH("net.inet6.ip6.auto_linklocal", 177 &V_ip6_auto_linklocal); 178 TUNABLE_INT_FETCH("net.inet6.ip6.accept_rtadv", &V_ip6_accept_rtadv); 179 TUNABLE_INT_FETCH("net.inet6.ip6.no_radr", &V_ip6_no_radr); 180 181 TAILQ_INIT(&V_in6_ifaddrhead); 182 V_in6_ifaddrhashtbl = hashinit(IN6ADDR_NHASH, M_IFADDR, 183 &V_in6_ifaddrhmask); 184 185 /* Initialize packet filter hooks. */ 186 V_inet6_pfil_hook.ph_type = PFIL_TYPE_AF; 187 V_inet6_pfil_hook.ph_af = AF_INET6; 188 if ((i = pfil_head_register(&V_inet6_pfil_hook)) != 0) 189 printf("%s: WARNING: unable to register pfil hook, " 190 "error %d\n", __func__, i); 191 192 scope6_init(); 193 addrsel_policy_init(); 194 nd6_init(); 195 frag6_init(); 196 197 #ifdef FLOWTABLE 198 if (TUNABLE_INT_FETCH("net.inet6.ip6.output_flowtable_size", 199 &V_ip6_output_flowtable_size)) { 200 if (V_ip6_output_flowtable_size < 256) 201 V_ip6_output_flowtable_size = 256; 202 if (!powerof2(V_ip6_output_flowtable_size)) { 203 printf("flowtable must be power of 2 size\n"); 204 V_ip6_output_flowtable_size = 2048; 205 } 206 } else { 207 /* 208 * round up to the next power of 2 209 */ 210 V_ip6_output_flowtable_size = 1 << fls((1024 + maxusers * 64)-1); 211 } 212 V_ip6_ft = flowtable_alloc("ipv6", V_ip6_output_flowtable_size, FL_IPV6|FL_PCPU); 213 #endif 214 215 V_ip6_desync_factor = arc4random() % MAX_TEMP_DESYNC_FACTOR; 216 217 /* Skip global initialization stuff for non-default instances. */ 218 if (!IS_DEFAULT_VNET(curvnet)) 219 return; 220 221 #ifdef DIAGNOSTIC 222 if (sizeof(struct protosw) != sizeof(struct ip6protosw)) 223 panic("sizeof(protosw) != sizeof(ip6protosw)"); 224 #endif 225 pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 226 if (pr == NULL) 227 panic("ip6_init"); 228 229 /* Initialize the entire ip6_protox[] array to IPPROTO_RAW. */ 230 for (i = 0; i < IPPROTO_MAX; i++) 231 ip6_protox[i] = pr - inet6sw; 232 /* 233 * Cycle through IP protocols and put them into the appropriate place 234 * in ip6_protox[]. 235 */ 236 for (pr = (struct ip6protosw *)inet6domain.dom_protosw; 237 pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++) 238 if (pr->pr_domain->dom_family == PF_INET6 && 239 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) { 240 /* Be careful to only index valid IP protocols. */ 241 if (pr->pr_protocol < IPPROTO_MAX) 242 ip6_protox[pr->pr_protocol] = pr - inet6sw; 243 } 244 245 netisr_register(&ip6_nh); 246 } 247 248 /* 249 * The protocol to be inserted into ip6_protox[] must be already registered 250 * in inet6sw[], either statically or through pf_proto_register(). 251 */ 252 int 253 ip6proto_register(short ip6proto) 254 { 255 struct ip6protosw *pr; 256 257 /* Sanity checks. */ 258 if (ip6proto <= 0 || ip6proto >= IPPROTO_MAX) 259 return (EPROTONOSUPPORT); 260 261 /* 262 * The protocol slot must not be occupied by another protocol 263 * already. An index pointing to IPPROTO_RAW is unused. 264 */ 265 pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 266 if (pr == NULL) 267 return (EPFNOSUPPORT); 268 if (ip6_protox[ip6proto] != pr - inet6sw) /* IPPROTO_RAW */ 269 return (EEXIST); 270 271 /* 272 * Find the protocol position in inet6sw[] and set the index. 273 */ 274 for (pr = (struct ip6protosw *)inet6domain.dom_protosw; 275 pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++) { 276 if (pr->pr_domain->dom_family == PF_INET6 && 277 pr->pr_protocol && pr->pr_protocol == ip6proto) { 278 ip6_protox[pr->pr_protocol] = pr - inet6sw; 279 return (0); 280 } 281 } 282 return (EPROTONOSUPPORT); 283 } 284 285 int 286 ip6proto_unregister(short ip6proto) 287 { 288 struct ip6protosw *pr; 289 290 /* Sanity checks. */ 291 if (ip6proto <= 0 || ip6proto >= IPPROTO_MAX) 292 return (EPROTONOSUPPORT); 293 294 /* Check if the protocol was indeed registered. */ 295 pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 296 if (pr == NULL) 297 return (EPFNOSUPPORT); 298 if (ip6_protox[ip6proto] == pr - inet6sw) /* IPPROTO_RAW */ 299 return (ENOENT); 300 301 /* Reset the protocol slot to IPPROTO_RAW. */ 302 ip6_protox[ip6proto] = pr - inet6sw; 303 return (0); 304 } 305 306 #ifdef VIMAGE 307 void 308 ip6_destroy() 309 { 310 311 hashdestroy(V_in6_ifaddrhashtbl, M_IFADDR, V_in6_ifaddrhmask); 312 nd6_destroy(); 313 callout_drain(&V_in6_tmpaddrtimer_ch); 314 } 315 #endif 316 317 static int 318 ip6_init2_vnet(const void *unused __unused) 319 { 320 321 /* nd6_timer_init */ 322 callout_init(&V_nd6_timer_ch, 0); 323 callout_reset(&V_nd6_timer_ch, hz, nd6_timer, curvnet); 324 325 /* timer for regeneranation of temporary addresses randomize ID */ 326 callout_init(&V_in6_tmpaddrtimer_ch, 0); 327 callout_reset(&V_in6_tmpaddrtimer_ch, 328 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor - 329 V_ip6_temp_regen_advance) * hz, 330 in6_tmpaddrtimer, curvnet); 331 332 return (0); 333 } 334 335 static void 336 ip6_init2(void *dummy) 337 { 338 339 ip6_init2_vnet(NULL); 340 } 341 342 /* cheat */ 343 /* This must be after route_init(), which is now SI_ORDER_THIRD */ 344 SYSINIT(netinet6init2, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ip6_init2, NULL); 345 346 static int 347 ip6_input_hbh(struct mbuf *m, uint32_t *plen, uint32_t *rtalert, int *off, 348 int *nxt, int *ours) 349 { 350 struct ip6_hdr *ip6; 351 struct ip6_hbh *hbh; 352 353 if (ip6_hopopts_input(plen, rtalert, &m, off)) { 354 #if 0 /*touches NULL pointer*/ 355 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 356 #endif 357 goto out; /* m have already been freed */ 358 } 359 360 /* adjust pointer */ 361 ip6 = mtod(m, struct ip6_hdr *); 362 363 /* 364 * if the payload length field is 0 and the next header field 365 * indicates Hop-by-Hop Options header, then a Jumbo Payload 366 * option MUST be included. 367 */ 368 if (ip6->ip6_plen == 0 && *plen == 0) { 369 /* 370 * Note that if a valid jumbo payload option is 371 * contained, ip6_hopopts_input() must set a valid 372 * (non-zero) payload length to the variable plen. 373 */ 374 IP6STAT_INC(ip6s_badoptions); 375 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 376 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 377 icmp6_error(m, ICMP6_PARAM_PROB, 378 ICMP6_PARAMPROB_HEADER, 379 (caddr_t)&ip6->ip6_plen - (caddr_t)ip6); 380 goto out; 381 } 382 #ifndef PULLDOWN_TEST 383 /* ip6_hopopts_input() ensures that mbuf is contiguous */ 384 hbh = (struct ip6_hbh *)(ip6 + 1); 385 #else 386 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 387 sizeof(struct ip6_hbh)); 388 if (hbh == NULL) { 389 IP6STAT_INC(ip6s_tooshort); 390 goto out; 391 } 392 #endif 393 *nxt = hbh->ip6h_nxt; 394 395 /* 396 * If we are acting as a router and the packet contains a 397 * router alert option, see if we know the option value. 398 * Currently, we only support the option value for MLD, in which 399 * case we should pass the packet to the multicast routing 400 * daemon. 401 */ 402 if (*rtalert != ~0) { 403 switch (*rtalert) { 404 case IP6OPT_RTALERT_MLD: 405 if (V_ip6_forwarding) 406 *ours = 1; 407 break; 408 default: 409 /* 410 * RFC2711 requires unrecognized values must be 411 * silently ignored. 412 */ 413 break; 414 } 415 } 416 417 return (0); 418 419 out: 420 return (1); 421 } 422 423 void 424 ip6_input(struct mbuf *m) 425 { 426 struct ip6_hdr *ip6; 427 int off = sizeof(struct ip6_hdr), nest; 428 u_int32_t plen; 429 u_int32_t rtalert = ~0; 430 int nxt, ours = 0; 431 struct ifnet *deliverifp = NULL, *ifp = NULL; 432 struct in6_addr odst; 433 struct route_in6 rin6; 434 int srcrt = 0; 435 struct llentry *lle = NULL; 436 struct sockaddr_in6 dst6, *dst; 437 438 bzero(&rin6, sizeof(struct route_in6)); 439 #ifdef IPSEC 440 /* 441 * should the inner packet be considered authentic? 442 * see comment in ah4_input(). 443 * NB: m cannot be NULL when passed to the input routine 444 */ 445 446 m->m_flags &= ~M_AUTHIPHDR; 447 m->m_flags &= ~M_AUTHIPDGM; 448 449 #endif /* IPSEC */ 450 451 /* 452 * make sure we don't have onion peering information into m_tag. 453 */ 454 ip6_delaux(m); 455 456 if (m->m_flags & M_FASTFWD_OURS) { 457 /* 458 * Firewall changed destination to local. 459 */ 460 m->m_flags &= ~M_FASTFWD_OURS; 461 ours = 1; 462 deliverifp = m->m_pkthdr.rcvif; 463 ip6 = mtod(m, struct ip6_hdr *); 464 goto hbhcheck; 465 } 466 467 /* 468 * mbuf statistics 469 */ 470 if (m->m_flags & M_EXT) { 471 if (m->m_next) 472 IP6STAT_INC(ip6s_mext2m); 473 else 474 IP6STAT_INC(ip6s_mext1); 475 } else { 476 if (m->m_next) { 477 if (m->m_flags & M_LOOP) { 478 IP6STAT_INC(ip6s_m2m[V_loif->if_index]); 479 } else if (m->m_pkthdr.rcvif->if_index < IP6S_M2MMAX) 480 IP6STAT_INC( 481 ip6s_m2m[m->m_pkthdr.rcvif->if_index]); 482 else 483 IP6STAT_INC(ip6s_m2m[0]); 484 } else 485 IP6STAT_INC(ip6s_m1); 486 } 487 488 /* drop the packet if IPv6 operation is disabled on the IF */ 489 if ((ND_IFINFO(m->m_pkthdr.rcvif)->flags & ND6_IFF_IFDISABLED)) { 490 m_freem(m); 491 return; 492 } 493 494 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive); 495 IP6STAT_INC(ip6s_total); 496 497 #ifndef PULLDOWN_TEST 498 /* 499 * L2 bridge code and some other code can return mbuf chain 500 * that does not conform to KAME requirement. too bad. 501 * XXX: fails to join if interface MTU > MCLBYTES. jumbogram? 502 */ 503 if (m && m->m_next != NULL && m->m_pkthdr.len < MCLBYTES) { 504 struct mbuf *n; 505 506 if (m->m_pkthdr.len > MHLEN) 507 n = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 508 else 509 n = m_gethdr(M_NOWAIT, MT_DATA); 510 if (n == NULL) { 511 m_freem(m); 512 return; /* ENOBUFS */ 513 } 514 515 m_move_pkthdr(n, m); 516 m_copydata(m, 0, n->m_pkthdr.len, mtod(n, caddr_t)); 517 n->m_len = n->m_pkthdr.len; 518 m_freem(m); 519 m = n; 520 } 521 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), /* nothing */); 522 #endif 523 524 if (m->m_len < sizeof(struct ip6_hdr)) { 525 struct ifnet *inifp; 526 inifp = m->m_pkthdr.rcvif; 527 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 528 IP6STAT_INC(ip6s_toosmall); 529 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 530 return; 531 } 532 } 533 534 ip6 = mtod(m, struct ip6_hdr *); 535 536 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 537 IP6STAT_INC(ip6s_badvers); 538 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 539 goto bad; 540 } 541 542 IP6STAT_INC(ip6s_nxthist[ip6->ip6_nxt]); 543 544 IP_PROBE(receive, NULL, NULL, ip6, m->m_pkthdr.rcvif, NULL, ip6); 545 546 /* 547 * Check against address spoofing/corruption. 548 */ 549 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) || 550 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) { 551 /* 552 * XXX: "badscope" is not very suitable for a multicast source. 553 */ 554 IP6STAT_INC(ip6s_badscope); 555 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 556 goto bad; 557 } 558 if (IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) && 559 !(m->m_flags & M_LOOP)) { 560 /* 561 * In this case, the packet should come from the loopback 562 * interface. However, we cannot just check the if_flags, 563 * because ip6_mloopback() passes the "actual" interface 564 * as the outgoing/incoming interface. 565 */ 566 IP6STAT_INC(ip6s_badscope); 567 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 568 goto bad; 569 } 570 571 #ifdef ALTQ 572 if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) { 573 /* packet is dropped by traffic conditioner */ 574 return; 575 } 576 #endif 577 /* 578 * The following check is not documented in specs. A malicious 579 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack 580 * and bypass security checks (act as if it was from 127.0.0.1 by using 581 * IPv6 src ::ffff:127.0.0.1). Be cautious. 582 * 583 * This check chokes if we are in an SIIT cloud. As none of BSDs 584 * support IPv4-less kernel compilation, we cannot support SIIT 585 * environment at all. So, it makes more sense for us to reject any 586 * malicious packets for non-SIIT environment, than try to do a 587 * partial support for SIIT environment. 588 */ 589 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 590 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 591 IP6STAT_INC(ip6s_badscope); 592 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 593 goto bad; 594 } 595 #if 0 596 /* 597 * Reject packets with IPv4 compatible addresses (auto tunnel). 598 * 599 * The code forbids auto tunnel relay case in RFC1933 (the check is 600 * stronger than RFC1933). We may want to re-enable it if mech-xx 601 * is revised to forbid relaying case. 602 */ 603 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) || 604 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) { 605 IP6STAT_INC(ip6s_badscope); 606 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 607 goto bad; 608 } 609 #endif 610 #ifdef IPSEC 611 /* 612 * Bypass packet filtering for packets previously handled by IPsec. 613 */ 614 if (ip6_ipsec_filtertunnel(m)) 615 goto passin; 616 #endif /* IPSEC */ 617 618 /* 619 * Run through list of hooks for input packets. 620 * 621 * NB: Beware of the destination address changing 622 * (e.g. by NAT rewriting). When this happens, 623 * tell ip6_forward to do the right thing. 624 */ 625 odst = ip6->ip6_dst; 626 627 /* Jump over all PFIL processing if hooks are not active. */ 628 if (!PFIL_HOOKED(&V_inet6_pfil_hook)) 629 goto passin; 630 631 if (pfil_run_hooks(&V_inet6_pfil_hook, &m, 632 m->m_pkthdr.rcvif, PFIL_IN, NULL)) 633 return; 634 if (m == NULL) /* consumed by filter */ 635 return; 636 ip6 = mtod(m, struct ip6_hdr *); 637 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst); 638 639 if (m->m_flags & M_FASTFWD_OURS) { 640 m->m_flags &= ~M_FASTFWD_OURS; 641 ours = 1; 642 deliverifp = m->m_pkthdr.rcvif; 643 goto hbhcheck; 644 } 645 if ((m->m_flags & M_IP6_NEXTHOP) && 646 m_tag_find(m, PACKET_TAG_IPFORWARD, NULL) != NULL) { 647 /* 648 * Directly ship the packet on. This allows forwarding 649 * packets originally destined to us to some other directly 650 * connected host. 651 */ 652 ip6_forward(m, 1); 653 goto out; 654 } 655 656 passin: 657 /* 658 * Disambiguate address scope zones (if there is ambiguity). 659 * We first make sure that the original source or destination address 660 * is not in our internal form for scoped addresses. Such addresses 661 * are not necessarily invalid spec-wise, but we cannot accept them due 662 * to the usage conflict. 663 * in6_setscope() then also checks and rejects the cases where src or 664 * dst are the loopback address and the receiving interface 665 * is not loopback. 666 */ 667 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) { 668 IP6STAT_INC(ip6s_badscope); /* XXX */ 669 goto bad; 670 } 671 if (in6_setscope(&ip6->ip6_src, m->m_pkthdr.rcvif, NULL) || 672 in6_setscope(&ip6->ip6_dst, m->m_pkthdr.rcvif, NULL)) { 673 IP6STAT_INC(ip6s_badscope); 674 goto bad; 675 } 676 677 /* 678 * Multicast check. Assume packet is for us to avoid 679 * prematurely taking locks. 680 */ 681 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 682 ours = 1; 683 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast); 684 deliverifp = m->m_pkthdr.rcvif; 685 goto hbhcheck; 686 } 687 688 /* 689 * Unicast check 690 */ 691 692 bzero(&dst6, sizeof(dst6)); 693 dst6.sin6_family = AF_INET6; 694 dst6.sin6_len = sizeof(struct sockaddr_in6); 695 dst6.sin6_addr = ip6->ip6_dst; 696 ifp = m->m_pkthdr.rcvif; 697 IF_AFDATA_RLOCK(ifp); 698 lle = lla_lookup(LLTABLE6(ifp), 0, 699 (struct sockaddr *)&dst6); 700 IF_AFDATA_RUNLOCK(ifp); 701 if ((lle != NULL) && (lle->la_flags & LLE_IFADDR)) { 702 struct ifaddr *ifa; 703 struct in6_ifaddr *ia6; 704 int bad; 705 706 bad = 1; 707 #define sa_equal(a1, a2) \ 708 (bcmp((a1), (a2), ((a1))->sin6_len) == 0) 709 IF_ADDR_RLOCK(ifp); 710 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 711 if (ifa->ifa_addr->sa_family != dst6.sin6_family) 712 continue; 713 if (sa_equal(&dst6, ifa->ifa_addr)) 714 break; 715 } 716 KASSERT(ifa != NULL, ("%s: ifa not found for lle %p", 717 __func__, lle)); 718 #undef sa_equal 719 720 ia6 = (struct in6_ifaddr *)ifa; 721 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) { 722 /* Count the packet in the ip address stats */ 723 ia6->ia_ifa.if_ipackets++; 724 ia6->ia_ifa.if_ibytes += m->m_pkthdr.len; 725 726 /* 727 * record address information into m_tag. 728 */ 729 (void)ip6_setdstifaddr(m, ia6); 730 731 bad = 0; 732 } else { 733 char ip6bufs[INET6_ADDRSTRLEN]; 734 char ip6bufd[INET6_ADDRSTRLEN]; 735 /* address is not ready, so discard the packet. */ 736 nd6log((LOG_INFO, 737 "ip6_input: packet to an unready address %s->%s\n", 738 ip6_sprintf(ip6bufs, &ip6->ip6_src), 739 ip6_sprintf(ip6bufd, &ip6->ip6_dst))); 740 } 741 IF_ADDR_RUNLOCK(ifp); 742 LLE_RUNLOCK(lle); 743 if (bad) 744 goto bad; 745 else { 746 ours = 1; 747 deliverifp = ifp; 748 goto hbhcheck; 749 } 750 } 751 if (lle != NULL) 752 LLE_RUNLOCK(lle); 753 754 dst = &rin6.ro_dst; 755 dst->sin6_len = sizeof(struct sockaddr_in6); 756 dst->sin6_family = AF_INET6; 757 dst->sin6_addr = ip6->ip6_dst; 758 rin6.ro_rt = in6_rtalloc1((struct sockaddr *)dst, 0, 0, M_GETFIB(m)); 759 if (rin6.ro_rt) 760 RT_UNLOCK(rin6.ro_rt); 761 762 #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key)) 763 764 /* 765 * Accept the packet if the forwarding interface to the destination 766 * according to the routing table is the loopback interface, 767 * unless the associated route has a gateway. 768 * Note that this approach causes to accept a packet if there is a 769 * route to the loopback interface for the destination of the packet. 770 * But we think it's even useful in some situations, e.g. when using 771 * a special daemon which wants to intercept the packet. 772 * 773 * XXX: some OSes automatically make a cloned route for the destination 774 * of an outgoing packet. If the outgoing interface of the packet 775 * is a loopback one, the kernel would consider the packet to be 776 * accepted, even if we have no such address assinged on the interface. 777 * We check the cloned flag of the route entry to reject such cases, 778 * assuming that route entries for our own addresses are not made by 779 * cloning (it should be true because in6_addloop explicitly installs 780 * the host route). However, we might have to do an explicit check 781 * while it would be less efficient. Or, should we rather install a 782 * reject route for such a case? 783 */ 784 if (rin6.ro_rt && 785 (rin6.ro_rt->rt_flags & 786 (RTF_HOST|RTF_GATEWAY)) == RTF_HOST && 787 #ifdef RTF_WASCLONED 788 !(rin6.ro_rt->rt_flags & RTF_WASCLONED) && 789 #endif 790 #ifdef RTF_CLONED 791 !(rin6.ro_rt->rt_flags & RTF_CLONED) && 792 #endif 793 #if 0 794 /* 795 * The check below is redundant since the comparison of 796 * the destination and the key of the rtentry has 797 * already done through looking up the routing table. 798 */ 799 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 800 &rt6_key(rin6.ro_rt)->sin6_addr) 801 #endif 802 rin6.ro_rt->rt_ifp->if_type == IFT_LOOP) { 803 int free_ia6 = 0; 804 struct in6_ifaddr *ia6; 805 806 /* 807 * found the loopback route to the interface address 808 */ 809 if (rin6.ro_rt->rt_gateway->sa_family == AF_LINK) { 810 struct sockaddr_in6 dest6; 811 812 bzero(&dest6, sizeof(dest6)); 813 dest6.sin6_family = AF_INET6; 814 dest6.sin6_len = sizeof(dest6); 815 dest6.sin6_addr = ip6->ip6_dst; 816 ia6 = (struct in6_ifaddr *) 817 ifa_ifwithaddr((struct sockaddr *)&dest6); 818 if (ia6 == NULL) 819 goto bad; 820 free_ia6 = 1; 821 } 822 else 823 ia6 = (struct in6_ifaddr *)rin6.ro_rt->rt_ifa; 824 825 /* 826 * record address information into m_tag. 827 */ 828 (void)ip6_setdstifaddr(m, ia6); 829 830 /* 831 * packets to a tentative, duplicated, or somehow invalid 832 * address must not be accepted. 833 */ 834 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) { 835 /* this address is ready */ 836 ours = 1; 837 deliverifp = ia6->ia_ifp; /* correct? */ 838 /* Count the packet in the ip address stats */ 839 ia6->ia_ifa.if_ipackets++; 840 ia6->ia_ifa.if_ibytes += m->m_pkthdr.len; 841 if (ia6 != NULL && free_ia6 != 0) 842 ifa_free(&ia6->ia_ifa); 843 goto hbhcheck; 844 } else { 845 char ip6bufs[INET6_ADDRSTRLEN]; 846 char ip6bufd[INET6_ADDRSTRLEN]; 847 /* address is not ready, so discard the packet. */ 848 nd6log((LOG_INFO, 849 "ip6_input: packet to an unready address %s->%s\n", 850 ip6_sprintf(ip6bufs, &ip6->ip6_src), 851 ip6_sprintf(ip6bufd, &ip6->ip6_dst))); 852 853 if (ia6 != NULL && free_ia6 != 0) 854 ifa_free(&ia6->ia_ifa); 855 goto bad; 856 } 857 } 858 859 /* 860 * FAITH (Firewall Aided Internet Translator) 861 */ 862 if (V_ip6_keepfaith) { 863 if (rin6.ro_rt && rin6.ro_rt->rt_ifp && 864 rin6.ro_rt->rt_ifp->if_type == IFT_FAITH) { 865 /* XXX do we need more sanity checks? */ 866 ours = 1; 867 deliverifp = rin6.ro_rt->rt_ifp; /* faith */ 868 goto hbhcheck; 869 } 870 } 871 872 /* 873 * Now there is no reason to process the packet if it's not our own 874 * and we're not a router. 875 */ 876 if (!V_ip6_forwarding) { 877 IP6STAT_INC(ip6s_cantforward); 878 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 879 goto bad; 880 } 881 882 hbhcheck: 883 /* 884 * record address information into m_tag, if we don't have one yet. 885 * note that we are unable to record it, if the address is not listed 886 * as our interface address (e.g. multicast addresses, addresses 887 * within FAITH prefixes and such). 888 */ 889 if (deliverifp) { 890 struct in6_ifaddr *ia6; 891 892 if ((ia6 = ip6_getdstifaddr(m)) != NULL) { 893 ifa_free(&ia6->ia_ifa); 894 } else { 895 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 896 if (ia6) { 897 if (!ip6_setdstifaddr(m, ia6)) { 898 /* 899 * XXX maybe we should drop the packet here, 900 * as we could not provide enough information 901 * to the upper layers. 902 */ 903 } 904 ifa_free(&ia6->ia_ifa); 905 } 906 } 907 } 908 909 /* 910 * Process Hop-by-Hop options header if it's contained. 911 * m may be modified in ip6_hopopts_input(). 912 * If a JumboPayload option is included, plen will also be modified. 913 */ 914 plen = (u_int32_t)ntohs(ip6->ip6_plen); 915 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 916 int error; 917 918 error = ip6_input_hbh(m, &plen, &rtalert, &off, &nxt, &ours); 919 if (error != 0) 920 goto out; 921 } else 922 nxt = ip6->ip6_nxt; 923 924 /* 925 * Check that the amount of data in the buffers 926 * is as at least much as the IPv6 header would have us expect. 927 * Trim mbufs if longer than we expect. 928 * Drop packet if shorter than we expect. 929 */ 930 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 931 IP6STAT_INC(ip6s_tooshort); 932 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 933 goto bad; 934 } 935 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 936 if (m->m_len == m->m_pkthdr.len) { 937 m->m_len = sizeof(struct ip6_hdr) + plen; 938 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 939 } else 940 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 941 } 942 943 /* 944 * Forward if desirable. 945 */ 946 if (V_ip6_mrouter && 947 IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 948 /* 949 * If we are acting as a multicast router, all 950 * incoming multicast packets are passed to the 951 * kernel-level multicast forwarding function. 952 * The packet is returned (relatively) intact; if 953 * ip6_mforward() returns a non-zero value, the packet 954 * must be discarded, else it may be accepted below. 955 * 956 * XXX TODO: Check hlim and multicast scope here to avoid 957 * unnecessarily calling into ip6_mforward(). 958 */ 959 if (ip6_mforward && 960 ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) { 961 IP6STAT_INC(ip6s_cantforward); 962 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 963 goto bad; 964 } 965 } else if (!ours) { 966 ip6_forward(m, srcrt); 967 goto out; 968 } 969 970 ip6 = mtod(m, struct ip6_hdr *); 971 972 /* 973 * Malicious party may be able to use IPv4 mapped addr to confuse 974 * tcp/udp stack and bypass security checks (act as if it was from 975 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious. 976 * 977 * For SIIT end node behavior, you may want to disable the check. 978 * However, you will become vulnerable to attacks using IPv4 mapped 979 * source. 980 */ 981 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 982 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 983 IP6STAT_INC(ip6s_badscope); 984 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 985 goto bad; 986 } 987 988 /* 989 * Tell launch routine the next header 990 */ 991 IP6STAT_INC(ip6s_delivered); 992 in6_ifstat_inc(deliverifp, ifs6_in_deliver); 993 nest = 0; 994 995 while (nxt != IPPROTO_DONE) { 996 if (V_ip6_hdrnestlimit && (++nest > V_ip6_hdrnestlimit)) { 997 IP6STAT_INC(ip6s_toomanyhdr); 998 goto bad; 999 } 1000 1001 /* 1002 * protection against faulty packet - there should be 1003 * more sanity checks in header chain processing. 1004 */ 1005 if (m->m_pkthdr.len < off) { 1006 IP6STAT_INC(ip6s_tooshort); 1007 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 1008 goto bad; 1009 } 1010 1011 #ifdef IPSEC 1012 /* 1013 * enforce IPsec policy checking if we are seeing last header. 1014 * note that we do not visit this with protocols with pcb layer 1015 * code - like udp/tcp/raw ip. 1016 */ 1017 if (ip6_ipsec_input(m, nxt)) 1018 goto bad; 1019 #endif /* IPSEC */ 1020 1021 /* 1022 * Use mbuf flags to propagate Router Alert option to 1023 * ICMPv6 layer, as hop-by-hop options have been stripped. 1024 */ 1025 if (nxt == IPPROTO_ICMPV6 && rtalert != ~0) 1026 m->m_flags |= M_RTALERT_MLD; 1027 1028 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt); 1029 } 1030 goto out; 1031 bad: 1032 m_freem(m); 1033 out: 1034 if (rin6.ro_rt) 1035 RTFREE(rin6.ro_rt); 1036 } 1037 1038 /* 1039 * set/grab in6_ifaddr correspond to IPv6 destination address. 1040 * XXX backward compatibility wrapper 1041 * 1042 * XXXRW: We should bump the refcount on ia6 before sticking it in the m_tag, 1043 * and then bump it when the tag is copied, and release it when the tag is 1044 * freed. Unfortunately, m_tags don't support deep copies (yet), so instead 1045 * we just bump the ia refcount when we receive it. This should be fixed. 1046 */ 1047 static struct ip6aux * 1048 ip6_setdstifaddr(struct mbuf *m, struct in6_ifaddr *ia6) 1049 { 1050 struct ip6aux *ip6a; 1051 1052 ip6a = ip6_addaux(m); 1053 if (ip6a) 1054 ip6a->ip6a_dstia6 = ia6; 1055 return ip6a; /* NULL if failed to set */ 1056 } 1057 1058 struct in6_ifaddr * 1059 ip6_getdstifaddr(struct mbuf *m) 1060 { 1061 struct ip6aux *ip6a; 1062 struct in6_ifaddr *ia; 1063 1064 ip6a = ip6_findaux(m); 1065 if (ip6a) { 1066 ia = ip6a->ip6a_dstia6; 1067 ifa_ref(&ia->ia_ifa); 1068 return ia; 1069 } else 1070 return NULL; 1071 } 1072 1073 /* 1074 * Hop-by-Hop options header processing. If a valid jumbo payload option is 1075 * included, the real payload length will be stored in plenp. 1076 * 1077 * rtalertp - XXX: should be stored more smart way 1078 */ 1079 static int 1080 ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp, 1081 struct mbuf **mp, int *offp) 1082 { 1083 struct mbuf *m = *mp; 1084 int off = *offp, hbhlen; 1085 struct ip6_hbh *hbh; 1086 u_int8_t *opt; 1087 1088 /* validation of the length of the header */ 1089 #ifndef PULLDOWN_TEST 1090 IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1); 1091 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); 1092 hbhlen = (hbh->ip6h_len + 1) << 3; 1093 1094 IP6_EXTHDR_CHECK(m, off, hbhlen, -1); 1095 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); 1096 #else 1097 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, 1098 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh)); 1099 if (hbh == NULL) { 1100 IP6STAT_INC(ip6s_tooshort); 1101 return -1; 1102 } 1103 hbhlen = (hbh->ip6h_len + 1) << 3; 1104 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 1105 hbhlen); 1106 if (hbh == NULL) { 1107 IP6STAT_INC(ip6s_tooshort); 1108 return -1; 1109 } 1110 #endif 1111 off += hbhlen; 1112 hbhlen -= sizeof(struct ip6_hbh); 1113 opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh); 1114 1115 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 1116 hbhlen, rtalertp, plenp) < 0) 1117 return (-1); 1118 1119 *offp = off; 1120 *mp = m; 1121 return (0); 1122 } 1123 1124 /* 1125 * Search header for all Hop-by-hop options and process each option. 1126 * This function is separate from ip6_hopopts_input() in order to 1127 * handle a case where the sending node itself process its hop-by-hop 1128 * options header. In such a case, the function is called from ip6_output(). 1129 * 1130 * The function assumes that hbh header is located right after the IPv6 header 1131 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to 1132 * opthead + hbhlen is located in contiguous memory region. 1133 */ 1134 int 1135 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen, 1136 u_int32_t *rtalertp, u_int32_t *plenp) 1137 { 1138 struct ip6_hdr *ip6; 1139 int optlen = 0; 1140 u_int8_t *opt = opthead; 1141 u_int16_t rtalert_val; 1142 u_int32_t jumboplen; 1143 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh); 1144 1145 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 1146 switch (*opt) { 1147 case IP6OPT_PAD1: 1148 optlen = 1; 1149 break; 1150 case IP6OPT_PADN: 1151 if (hbhlen < IP6OPT_MINLEN) { 1152 IP6STAT_INC(ip6s_toosmall); 1153 goto bad; 1154 } 1155 optlen = *(opt + 1) + 2; 1156 break; 1157 case IP6OPT_ROUTER_ALERT: 1158 /* XXX may need check for alignment */ 1159 if (hbhlen < IP6OPT_RTALERT_LEN) { 1160 IP6STAT_INC(ip6s_toosmall); 1161 goto bad; 1162 } 1163 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) { 1164 /* XXX stat */ 1165 icmp6_error(m, ICMP6_PARAM_PROB, 1166 ICMP6_PARAMPROB_HEADER, 1167 erroff + opt + 1 - opthead); 1168 return (-1); 1169 } 1170 optlen = IP6OPT_RTALERT_LEN; 1171 bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2); 1172 *rtalertp = ntohs(rtalert_val); 1173 break; 1174 case IP6OPT_JUMBO: 1175 /* XXX may need check for alignment */ 1176 if (hbhlen < IP6OPT_JUMBO_LEN) { 1177 IP6STAT_INC(ip6s_toosmall); 1178 goto bad; 1179 } 1180 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) { 1181 /* XXX stat */ 1182 icmp6_error(m, ICMP6_PARAM_PROB, 1183 ICMP6_PARAMPROB_HEADER, 1184 erroff + opt + 1 - opthead); 1185 return (-1); 1186 } 1187 optlen = IP6OPT_JUMBO_LEN; 1188 1189 /* 1190 * IPv6 packets that have non 0 payload length 1191 * must not contain a jumbo payload option. 1192 */ 1193 ip6 = mtod(m, struct ip6_hdr *); 1194 if (ip6->ip6_plen) { 1195 IP6STAT_INC(ip6s_badoptions); 1196 icmp6_error(m, ICMP6_PARAM_PROB, 1197 ICMP6_PARAMPROB_HEADER, 1198 erroff + opt - opthead); 1199 return (-1); 1200 } 1201 1202 /* 1203 * We may see jumbolen in unaligned location, so 1204 * we'd need to perform bcopy(). 1205 */ 1206 bcopy(opt + 2, &jumboplen, sizeof(jumboplen)); 1207 jumboplen = (u_int32_t)htonl(jumboplen); 1208 1209 #if 1 1210 /* 1211 * if there are multiple jumbo payload options, 1212 * *plenp will be non-zero and the packet will be 1213 * rejected. 1214 * the behavior may need some debate in ipngwg - 1215 * multiple options does not make sense, however, 1216 * there's no explicit mention in specification. 1217 */ 1218 if (*plenp != 0) { 1219 IP6STAT_INC(ip6s_badoptions); 1220 icmp6_error(m, ICMP6_PARAM_PROB, 1221 ICMP6_PARAMPROB_HEADER, 1222 erroff + opt + 2 - opthead); 1223 return (-1); 1224 } 1225 #endif 1226 1227 /* 1228 * jumbo payload length must be larger than 65535. 1229 */ 1230 if (jumboplen <= IPV6_MAXPACKET) { 1231 IP6STAT_INC(ip6s_badoptions); 1232 icmp6_error(m, ICMP6_PARAM_PROB, 1233 ICMP6_PARAMPROB_HEADER, 1234 erroff + opt + 2 - opthead); 1235 return (-1); 1236 } 1237 *plenp = jumboplen; 1238 1239 break; 1240 default: /* unknown option */ 1241 if (hbhlen < IP6OPT_MINLEN) { 1242 IP6STAT_INC(ip6s_toosmall); 1243 goto bad; 1244 } 1245 optlen = ip6_unknown_opt(opt, m, 1246 erroff + opt - opthead); 1247 if (optlen == -1) 1248 return (-1); 1249 optlen += 2; 1250 break; 1251 } 1252 } 1253 1254 return (0); 1255 1256 bad: 1257 m_freem(m); 1258 return (-1); 1259 } 1260 1261 /* 1262 * Unknown option processing. 1263 * The third argument `off' is the offset from the IPv6 header to the option, 1264 * which is necessary if the IPv6 header the and option header and IPv6 header 1265 * is not contiguous in order to return an ICMPv6 error. 1266 */ 1267 int 1268 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off) 1269 { 1270 struct ip6_hdr *ip6; 1271 1272 switch (IP6OPT_TYPE(*optp)) { 1273 case IP6OPT_TYPE_SKIP: /* ignore the option */ 1274 return ((int)*(optp + 1)); 1275 case IP6OPT_TYPE_DISCARD: /* silently discard */ 1276 m_freem(m); 1277 return (-1); 1278 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 1279 IP6STAT_INC(ip6s_badoptions); 1280 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 1281 return (-1); 1282 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 1283 IP6STAT_INC(ip6s_badoptions); 1284 ip6 = mtod(m, struct ip6_hdr *); 1285 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 1286 (m->m_flags & (M_BCAST|M_MCAST))) 1287 m_freem(m); 1288 else 1289 icmp6_error(m, ICMP6_PARAM_PROB, 1290 ICMP6_PARAMPROB_OPTION, off); 1291 return (-1); 1292 } 1293 1294 m_freem(m); /* XXX: NOTREACHED */ 1295 return (-1); 1296 } 1297 1298 /* 1299 * Create the "control" list for this pcb. 1300 * These functions will not modify mbuf chain at all. 1301 * 1302 * With KAME mbuf chain restriction: 1303 * The routine will be called from upper layer handlers like tcp6_input(). 1304 * Thus the routine assumes that the caller (tcp6_input) have already 1305 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the 1306 * very first mbuf on the mbuf chain. 1307 * 1308 * ip6_savecontrol_v4 will handle those options that are possible to be 1309 * set on a v4-mapped socket. 1310 * ip6_savecontrol will directly call ip6_savecontrol_v4 to handle those 1311 * options and handle the v6-only ones itself. 1312 */ 1313 struct mbuf ** 1314 ip6_savecontrol_v4(struct inpcb *inp, struct mbuf *m, struct mbuf **mp, 1315 int *v4only) 1316 { 1317 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1318 1319 #ifdef SO_TIMESTAMP 1320 if ((inp->inp_socket->so_options & SO_TIMESTAMP) != 0) { 1321 struct timeval tv; 1322 1323 microtime(&tv); 1324 *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv), 1325 SCM_TIMESTAMP, SOL_SOCKET); 1326 if (*mp) 1327 mp = &(*mp)->m_next; 1328 } 1329 #endif 1330 1331 #define IS2292(inp, x, y) (((inp)->inp_flags & IN6P_RFC2292) ? (x) : (y)) 1332 /* RFC 2292 sec. 5 */ 1333 if ((inp->inp_flags & IN6P_PKTINFO) != 0) { 1334 struct in6_pktinfo pi6; 1335 1336 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1337 #ifdef INET 1338 struct ip *ip; 1339 1340 ip = mtod(m, struct ip *); 1341 pi6.ipi6_addr.s6_addr32[0] = 0; 1342 pi6.ipi6_addr.s6_addr32[1] = 0; 1343 pi6.ipi6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP; 1344 pi6.ipi6_addr.s6_addr32[3] = ip->ip_dst.s_addr; 1345 #else 1346 /* We won't hit this code */ 1347 bzero(&pi6.ipi6_addr, sizeof(struct in6_addr)); 1348 #endif 1349 } else { 1350 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr)); 1351 in6_clearscope(&pi6.ipi6_addr); /* XXX */ 1352 } 1353 pi6.ipi6_ifindex = 1354 (m && m->m_pkthdr.rcvif) ? m->m_pkthdr.rcvif->if_index : 0; 1355 1356 *mp = sbcreatecontrol((caddr_t) &pi6, 1357 sizeof(struct in6_pktinfo), 1358 IS2292(inp, IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6); 1359 if (*mp) 1360 mp = &(*mp)->m_next; 1361 } 1362 1363 if ((inp->inp_flags & IN6P_HOPLIMIT) != 0) { 1364 int hlim; 1365 1366 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1367 #ifdef INET 1368 struct ip *ip; 1369 1370 ip = mtod(m, struct ip *); 1371 hlim = ip->ip_ttl; 1372 #else 1373 /* We won't hit this code */ 1374 hlim = 0; 1375 #endif 1376 } else { 1377 hlim = ip6->ip6_hlim & 0xff; 1378 } 1379 *mp = sbcreatecontrol((caddr_t) &hlim, sizeof(int), 1380 IS2292(inp, IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), 1381 IPPROTO_IPV6); 1382 if (*mp) 1383 mp = &(*mp)->m_next; 1384 } 1385 1386 if ((inp->inp_flags & IN6P_TCLASS) != 0) { 1387 int tclass; 1388 1389 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1390 #ifdef INET 1391 struct ip *ip; 1392 1393 ip = mtod(m, struct ip *); 1394 tclass = ip->ip_tos; 1395 #else 1396 /* We won't hit this code */ 1397 tclass = 0; 1398 #endif 1399 } else { 1400 u_int32_t flowinfo; 1401 1402 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK); 1403 flowinfo >>= 20; 1404 tclass = flowinfo & 0xff; 1405 } 1406 *mp = sbcreatecontrol((caddr_t) &tclass, sizeof(int), 1407 IPV6_TCLASS, IPPROTO_IPV6); 1408 if (*mp) 1409 mp = &(*mp)->m_next; 1410 } 1411 1412 if (v4only != NULL) { 1413 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1414 *v4only = 1; 1415 } else { 1416 *v4only = 0; 1417 } 1418 } 1419 1420 return (mp); 1421 } 1422 1423 void 1424 ip6_savecontrol(struct inpcb *in6p, struct mbuf *m, struct mbuf **mp) 1425 { 1426 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1427 int v4only = 0; 1428 1429 mp = ip6_savecontrol_v4(in6p, m, mp, &v4only); 1430 if (v4only) 1431 return; 1432 1433 /* 1434 * IPV6_HOPOPTS socket option. Recall that we required super-user 1435 * privilege for the option (see ip6_ctloutput), but it might be too 1436 * strict, since there might be some hop-by-hop options which can be 1437 * returned to normal user. 1438 * See also RFC 2292 section 6 (or RFC 3542 section 8). 1439 */ 1440 if ((in6p->inp_flags & IN6P_HOPOPTS) != 0) { 1441 /* 1442 * Check if a hop-by-hop options header is contatined in the 1443 * received packet, and if so, store the options as ancillary 1444 * data. Note that a hop-by-hop options header must be 1445 * just after the IPv6 header, which is assured through the 1446 * IPv6 input processing. 1447 */ 1448 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 1449 struct ip6_hbh *hbh; 1450 int hbhlen = 0; 1451 #ifdef PULLDOWN_TEST 1452 struct mbuf *ext; 1453 #endif 1454 1455 #ifndef PULLDOWN_TEST 1456 hbh = (struct ip6_hbh *)(ip6 + 1); 1457 hbhlen = (hbh->ip6h_len + 1) << 3; 1458 #else 1459 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr), 1460 ip6->ip6_nxt); 1461 if (ext == NULL) { 1462 IP6STAT_INC(ip6s_tooshort); 1463 return; 1464 } 1465 hbh = mtod(ext, struct ip6_hbh *); 1466 hbhlen = (hbh->ip6h_len + 1) << 3; 1467 if (hbhlen != ext->m_len) { 1468 m_freem(ext); 1469 IP6STAT_INC(ip6s_tooshort); 1470 return; 1471 } 1472 #endif 1473 1474 /* 1475 * XXX: We copy the whole header even if a 1476 * jumbo payload option is included, the option which 1477 * is to be removed before returning according to 1478 * RFC2292. 1479 * Note: this constraint is removed in RFC3542 1480 */ 1481 *mp = sbcreatecontrol((caddr_t)hbh, hbhlen, 1482 IS2292(in6p, IPV6_2292HOPOPTS, IPV6_HOPOPTS), 1483 IPPROTO_IPV6); 1484 if (*mp) 1485 mp = &(*mp)->m_next; 1486 #ifdef PULLDOWN_TEST 1487 m_freem(ext); 1488 #endif 1489 } 1490 } 1491 1492 if ((in6p->inp_flags & (IN6P_RTHDR | IN6P_DSTOPTS)) != 0) { 1493 int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr); 1494 1495 /* 1496 * Search for destination options headers or routing 1497 * header(s) through the header chain, and stores each 1498 * header as ancillary data. 1499 * Note that the order of the headers remains in 1500 * the chain of ancillary data. 1501 */ 1502 while (1) { /* is explicit loop prevention necessary? */ 1503 struct ip6_ext *ip6e = NULL; 1504 int elen; 1505 #ifdef PULLDOWN_TEST 1506 struct mbuf *ext = NULL; 1507 #endif 1508 1509 /* 1510 * if it is not an extension header, don't try to 1511 * pull it from the chain. 1512 */ 1513 switch (nxt) { 1514 case IPPROTO_DSTOPTS: 1515 case IPPROTO_ROUTING: 1516 case IPPROTO_HOPOPTS: 1517 case IPPROTO_AH: /* is it possible? */ 1518 break; 1519 default: 1520 goto loopend; 1521 } 1522 1523 #ifndef PULLDOWN_TEST 1524 if (off + sizeof(*ip6e) > m->m_len) 1525 goto loopend; 1526 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off); 1527 if (nxt == IPPROTO_AH) 1528 elen = (ip6e->ip6e_len + 2) << 2; 1529 else 1530 elen = (ip6e->ip6e_len + 1) << 3; 1531 if (off + elen > m->m_len) 1532 goto loopend; 1533 #else 1534 ext = ip6_pullexthdr(m, off, nxt); 1535 if (ext == NULL) { 1536 IP6STAT_INC(ip6s_tooshort); 1537 return; 1538 } 1539 ip6e = mtod(ext, struct ip6_ext *); 1540 if (nxt == IPPROTO_AH) 1541 elen = (ip6e->ip6e_len + 2) << 2; 1542 else 1543 elen = (ip6e->ip6e_len + 1) << 3; 1544 if (elen != ext->m_len) { 1545 m_freem(ext); 1546 IP6STAT_INC(ip6s_tooshort); 1547 return; 1548 } 1549 #endif 1550 1551 switch (nxt) { 1552 case IPPROTO_DSTOPTS: 1553 if (!(in6p->inp_flags & IN6P_DSTOPTS)) 1554 break; 1555 1556 *mp = sbcreatecontrol((caddr_t)ip6e, elen, 1557 IS2292(in6p, 1558 IPV6_2292DSTOPTS, IPV6_DSTOPTS), 1559 IPPROTO_IPV6); 1560 if (*mp) 1561 mp = &(*mp)->m_next; 1562 break; 1563 case IPPROTO_ROUTING: 1564 if (!(in6p->inp_flags & IN6P_RTHDR)) 1565 break; 1566 1567 *mp = sbcreatecontrol((caddr_t)ip6e, elen, 1568 IS2292(in6p, IPV6_2292RTHDR, IPV6_RTHDR), 1569 IPPROTO_IPV6); 1570 if (*mp) 1571 mp = &(*mp)->m_next; 1572 break; 1573 case IPPROTO_HOPOPTS: 1574 case IPPROTO_AH: /* is it possible? */ 1575 break; 1576 1577 default: 1578 /* 1579 * other cases have been filtered in the above. 1580 * none will visit this case. here we supply 1581 * the code just in case (nxt overwritten or 1582 * other cases). 1583 */ 1584 #ifdef PULLDOWN_TEST 1585 m_freem(ext); 1586 #endif 1587 goto loopend; 1588 1589 } 1590 1591 /* proceed with the next header. */ 1592 off += elen; 1593 nxt = ip6e->ip6e_nxt; 1594 ip6e = NULL; 1595 #ifdef PULLDOWN_TEST 1596 m_freem(ext); 1597 ext = NULL; 1598 #endif 1599 } 1600 loopend: 1601 ; 1602 } 1603 } 1604 #undef IS2292 1605 1606 void 1607 ip6_notify_pmtu(struct inpcb *in6p, struct sockaddr_in6 *dst, u_int32_t *mtu) 1608 { 1609 struct socket *so; 1610 struct mbuf *m_mtu; 1611 struct ip6_mtuinfo mtuctl; 1612 1613 so = in6p->inp_socket; 1614 1615 if (mtu == NULL) 1616 return; 1617 1618 #ifdef DIAGNOSTIC 1619 if (so == NULL) /* I believe this is impossible */ 1620 panic("ip6_notify_pmtu: socket is NULL"); 1621 #endif 1622 1623 bzero(&mtuctl, sizeof(mtuctl)); /* zero-clear for safety */ 1624 mtuctl.ip6m_mtu = *mtu; 1625 mtuctl.ip6m_addr = *dst; 1626 if (sa6_recoverscope(&mtuctl.ip6m_addr)) 1627 return; 1628 1629 if ((m_mtu = sbcreatecontrol((caddr_t)&mtuctl, sizeof(mtuctl), 1630 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL) 1631 return; 1632 1633 if (sbappendaddr(&so->so_rcv, (struct sockaddr *)dst, NULL, m_mtu) 1634 == 0) { 1635 m_freem(m_mtu); 1636 /* XXX: should count statistics */ 1637 } else 1638 sorwakeup(so); 1639 1640 return; 1641 } 1642 1643 #ifdef PULLDOWN_TEST 1644 /* 1645 * pull single extension header from mbuf chain. returns single mbuf that 1646 * contains the result, or NULL on error. 1647 */ 1648 static struct mbuf * 1649 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt) 1650 { 1651 struct ip6_ext ip6e; 1652 size_t elen; 1653 struct mbuf *n; 1654 1655 #ifdef DIAGNOSTIC 1656 switch (nxt) { 1657 case IPPROTO_DSTOPTS: 1658 case IPPROTO_ROUTING: 1659 case IPPROTO_HOPOPTS: 1660 case IPPROTO_AH: /* is it possible? */ 1661 break; 1662 default: 1663 printf("ip6_pullexthdr: invalid nxt=%d\n", nxt); 1664 } 1665 #endif 1666 1667 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1668 if (nxt == IPPROTO_AH) 1669 elen = (ip6e.ip6e_len + 2) << 2; 1670 else 1671 elen = (ip6e.ip6e_len + 1) << 3; 1672 1673 if (elen > MLEN) 1674 n = m_getcl(M_NOWAIT, MT_DATA, 0); 1675 else 1676 n = m_get(M_NOWAIT, MT_DATA); 1677 if (n == NULL) 1678 return NULL; 1679 1680 m_copydata(m, off, elen, mtod(n, caddr_t)); 1681 n->m_len = elen; 1682 return n; 1683 } 1684 #endif 1685 1686 /* 1687 * Get pointer to the previous header followed by the header 1688 * currently processed. 1689 * XXX: This function supposes that 1690 * M includes all headers, 1691 * the next header field and the header length field of each header 1692 * are valid, and 1693 * the sum of each header length equals to OFF. 1694 * Because of these assumptions, this function must be called very 1695 * carefully. Moreover, it will not be used in the near future when 1696 * we develop `neater' mechanism to process extension headers. 1697 */ 1698 char * 1699 ip6_get_prevhdr(struct mbuf *m, int off) 1700 { 1701 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1702 1703 if (off == sizeof(struct ip6_hdr)) 1704 return (&ip6->ip6_nxt); 1705 else { 1706 int len, nxt; 1707 struct ip6_ext *ip6e = NULL; 1708 1709 nxt = ip6->ip6_nxt; 1710 len = sizeof(struct ip6_hdr); 1711 while (len < off) { 1712 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len); 1713 1714 switch (nxt) { 1715 case IPPROTO_FRAGMENT: 1716 len += sizeof(struct ip6_frag); 1717 break; 1718 case IPPROTO_AH: 1719 len += (ip6e->ip6e_len + 2) << 2; 1720 break; 1721 default: 1722 len += (ip6e->ip6e_len + 1) << 3; 1723 break; 1724 } 1725 nxt = ip6e->ip6e_nxt; 1726 } 1727 if (ip6e) 1728 return (&ip6e->ip6e_nxt); 1729 else 1730 return NULL; 1731 } 1732 } 1733 1734 /* 1735 * get next header offset. m will be retained. 1736 */ 1737 int 1738 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp) 1739 { 1740 struct ip6_hdr ip6; 1741 struct ip6_ext ip6e; 1742 struct ip6_frag fh; 1743 1744 /* just in case */ 1745 if (m == NULL) 1746 panic("ip6_nexthdr: m == NULL"); 1747 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off) 1748 return -1; 1749 1750 switch (proto) { 1751 case IPPROTO_IPV6: 1752 if (m->m_pkthdr.len < off + sizeof(ip6)) 1753 return -1; 1754 m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6); 1755 if (nxtp) 1756 *nxtp = ip6.ip6_nxt; 1757 off += sizeof(ip6); 1758 return off; 1759 1760 case IPPROTO_FRAGMENT: 1761 /* 1762 * terminate parsing if it is not the first fragment, 1763 * it does not make sense to parse through it. 1764 */ 1765 if (m->m_pkthdr.len < off + sizeof(fh)) 1766 return -1; 1767 m_copydata(m, off, sizeof(fh), (caddr_t)&fh); 1768 /* IP6F_OFF_MASK = 0xfff8(BigEndian), 0xf8ff(LittleEndian) */ 1769 if (fh.ip6f_offlg & IP6F_OFF_MASK) 1770 return -1; 1771 if (nxtp) 1772 *nxtp = fh.ip6f_nxt; 1773 off += sizeof(struct ip6_frag); 1774 return off; 1775 1776 case IPPROTO_AH: 1777 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1778 return -1; 1779 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1780 if (nxtp) 1781 *nxtp = ip6e.ip6e_nxt; 1782 off += (ip6e.ip6e_len + 2) << 2; 1783 return off; 1784 1785 case IPPROTO_HOPOPTS: 1786 case IPPROTO_ROUTING: 1787 case IPPROTO_DSTOPTS: 1788 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1789 return -1; 1790 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1791 if (nxtp) 1792 *nxtp = ip6e.ip6e_nxt; 1793 off += (ip6e.ip6e_len + 1) << 3; 1794 return off; 1795 1796 case IPPROTO_NONE: 1797 case IPPROTO_ESP: 1798 case IPPROTO_IPCOMP: 1799 /* give up */ 1800 return -1; 1801 1802 default: 1803 return -1; 1804 } 1805 1806 return -1; 1807 } 1808 1809 /* 1810 * get offset for the last header in the chain. m will be kept untainted. 1811 */ 1812 int 1813 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp) 1814 { 1815 int newoff; 1816 int nxt; 1817 1818 if (!nxtp) { 1819 nxt = -1; 1820 nxtp = &nxt; 1821 } 1822 while (1) { 1823 newoff = ip6_nexthdr(m, off, proto, nxtp); 1824 if (newoff < 0) 1825 return off; 1826 else if (newoff < off) 1827 return -1; /* invalid */ 1828 else if (newoff == off) 1829 return newoff; 1830 1831 off = newoff; 1832 proto = *nxtp; 1833 } 1834 } 1835 1836 static struct ip6aux * 1837 ip6_addaux(struct mbuf *m) 1838 { 1839 struct m_tag *mtag; 1840 1841 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL); 1842 if (!mtag) { 1843 mtag = m_tag_get(PACKET_TAG_IPV6_INPUT, sizeof(struct ip6aux), 1844 M_NOWAIT); 1845 if (mtag) { 1846 m_tag_prepend(m, mtag); 1847 bzero(mtag + 1, sizeof(struct ip6aux)); 1848 } 1849 } 1850 return mtag ? (struct ip6aux *)(mtag + 1) : NULL; 1851 } 1852 1853 static struct ip6aux * 1854 ip6_findaux(struct mbuf *m) 1855 { 1856 struct m_tag *mtag; 1857 1858 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL); 1859 return mtag ? (struct ip6aux *)(mtag + 1) : NULL; 1860 } 1861 1862 static void 1863 ip6_delaux(struct mbuf *m) 1864 { 1865 struct m_tag *mtag; 1866 1867 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL); 1868 if (mtag) 1869 m_tag_delete(m, mtag); 1870 } 1871 1872 /* 1873 * System control for IP6 1874 */ 1875 1876 u_char inet6ctlerrmap[PRC_NCMDS] = { 1877 0, 0, 0, 0, 1878 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 1879 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 1880 EMSGSIZE, EHOSTUNREACH, 0, 0, 1881 0, 0, 0, 0, 1882 ENOPROTOOPT 1883 }; 1884