1 /*- 2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the project nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $KAME: ip6_input.c,v 1.259 2002/01/21 04:58:09 jinmei Exp $ 30 */ 31 32 /*- 33 * Copyright (c) 1982, 1986, 1988, 1993 34 * The Regents of the University of California. All rights reserved. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 2. Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in the 43 * documentation and/or other materials provided with the distribution. 44 * 4. Neither the name of the University nor the names of its contributors 45 * may be used to endorse or promote products derived from this software 46 * without specific prior written permission. 47 * 48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 58 * SUCH DAMAGE. 59 * 60 * @(#)ip_input.c 8.2 (Berkeley) 1/4/94 61 */ 62 63 #include <sys/cdefs.h> 64 __FBSDID("$FreeBSD$"); 65 66 #include "opt_inet.h" 67 #include "opt_inet6.h" 68 #include "opt_ipfw.h" 69 #include "opt_ipsec.h" 70 #include "opt_route.h" 71 72 #include <sys/param.h> 73 #include <sys/systm.h> 74 #include <sys/malloc.h> 75 #include <sys/mbuf.h> 76 #include <sys/proc.h> 77 #include <sys/domain.h> 78 #include <sys/protosw.h> 79 #include <sys/socket.h> 80 #include <sys/socketvar.h> 81 #include <sys/errno.h> 82 #include <sys/time.h> 83 #include <sys/kernel.h> 84 #include <sys/syslog.h> 85 86 #include <net/if.h> 87 #include <net/if_types.h> 88 #include <net/if_dl.h> 89 #include <net/route.h> 90 #include <net/netisr.h> 91 #include <net/pfil.h> 92 #include <net/vnet.h> 93 94 #include <netinet/in.h> 95 #include <netinet/ip_var.h> 96 #include <netinet/in_systm.h> 97 #include <net/if_llatbl.h> 98 #ifdef INET 99 #include <netinet/ip.h> 100 #include <netinet/ip_icmp.h> 101 #endif /* INET */ 102 #include <netinet/ip6.h> 103 #include <netinet6/in6_var.h> 104 #include <netinet6/ip6_var.h> 105 #include <netinet/in_pcb.h> 106 #include <netinet/icmp6.h> 107 #include <netinet6/scope6_var.h> 108 #include <netinet6/in6_ifattach.h> 109 #include <netinet6/nd6.h> 110 111 #ifdef IPSEC 112 #include <netipsec/ipsec.h> 113 #include <netinet6/ip6_ipsec.h> 114 #include <netipsec/ipsec6.h> 115 #endif /* IPSEC */ 116 117 #include <netinet6/ip6protosw.h> 118 119 #ifdef FLOWTABLE 120 #include <net/flowtable.h> 121 VNET_DECLARE(int, ip6_output_flowtable_size); 122 #define V_ip6_output_flowtable_size VNET(ip6_output_flowtable_size) 123 #endif 124 125 extern struct domain inet6domain; 126 127 u_char ip6_protox[IPPROTO_MAX]; 128 VNET_DEFINE(struct in6_ifaddrhead, in6_ifaddrhead); 129 VNET_DEFINE(struct in6_ifaddrlisthead *, in6_ifaddrhashtbl); 130 VNET_DEFINE(u_long, in6_ifaddrhmask); 131 132 static struct netisr_handler ip6_nh = { 133 .nh_name = "ip6", 134 .nh_handler = ip6_input, 135 .nh_proto = NETISR_IPV6, 136 .nh_policy = NETISR_POLICY_FLOW, 137 }; 138 139 VNET_DECLARE(struct callout, in6_tmpaddrtimer_ch); 140 #define V_in6_tmpaddrtimer_ch VNET(in6_tmpaddrtimer_ch) 141 142 VNET_DEFINE(struct pfil_head, inet6_pfil_hook); 143 144 VNET_DEFINE(struct ip6stat, ip6stat); 145 146 struct rwlock in6_ifaddr_lock; 147 RW_SYSINIT(in6_ifaddr_lock, &in6_ifaddr_lock, "in6_ifaddr_lock"); 148 149 static void ip6_init2(void *); 150 static struct ip6aux *ip6_setdstifaddr(struct mbuf *, struct in6_ifaddr *); 151 static struct ip6aux *ip6_addaux(struct mbuf *); 152 static struct ip6aux *ip6_findaux(struct mbuf *m); 153 static void ip6_delaux (struct mbuf *); 154 static int ip6_hopopts_input(u_int32_t *, u_int32_t *, struct mbuf **, int *); 155 #ifdef PULLDOWN_TEST 156 static struct mbuf *ip6_pullexthdr(struct mbuf *, size_t, int); 157 #endif 158 159 /* 160 * IP6 initialization: fill in IP6 protocol switch table. 161 * All protocols not implemented in kernel go to raw IP6 protocol handler. 162 */ 163 void 164 ip6_init(void) 165 { 166 struct ip6protosw *pr; 167 int i; 168 169 TUNABLE_INT_FETCH("net.inet6.ip6.auto_linklocal", 170 &V_ip6_auto_linklocal); 171 TUNABLE_INT_FETCH("net.inet6.ip6.accept_rtadv", &V_ip6_accept_rtadv); 172 TUNABLE_INT_FETCH("net.inet6.ip6.no_radr", &V_ip6_no_radr); 173 174 TAILQ_INIT(&V_in6_ifaddrhead); 175 V_in6_ifaddrhashtbl = hashinit(IN6ADDR_NHASH, M_IFADDR, 176 &V_in6_ifaddrhmask); 177 178 /* Initialize packet filter hooks. */ 179 V_inet6_pfil_hook.ph_type = PFIL_TYPE_AF; 180 V_inet6_pfil_hook.ph_af = AF_INET6; 181 if ((i = pfil_head_register(&V_inet6_pfil_hook)) != 0) 182 printf("%s: WARNING: unable to register pfil hook, " 183 "error %d\n", __func__, i); 184 185 scope6_init(); 186 addrsel_policy_init(); 187 nd6_init(); 188 frag6_init(); 189 190 #ifdef FLOWTABLE 191 if (TUNABLE_INT_FETCH("net.inet6.ip6.output_flowtable_size", 192 &V_ip6_output_flowtable_size)) { 193 if (V_ip6_output_flowtable_size < 256) 194 V_ip6_output_flowtable_size = 256; 195 if (!powerof2(V_ip6_output_flowtable_size)) { 196 printf("flowtable must be power of 2 size\n"); 197 V_ip6_output_flowtable_size = 2048; 198 } 199 } else { 200 /* 201 * round up to the next power of 2 202 */ 203 V_ip6_output_flowtable_size = 1 << fls((1024 + maxusers * 64)-1); 204 } 205 V_ip6_ft = flowtable_alloc("ipv6", V_ip6_output_flowtable_size, FL_IPV6|FL_PCPU); 206 #endif 207 208 V_ip6_desync_factor = arc4random() % MAX_TEMP_DESYNC_FACTOR; 209 210 /* Skip global initialization stuff for non-default instances. */ 211 if (!IS_DEFAULT_VNET(curvnet)) 212 return; 213 214 #ifdef DIAGNOSTIC 215 if (sizeof(struct protosw) != sizeof(struct ip6protosw)) 216 panic("sizeof(protosw) != sizeof(ip6protosw)"); 217 #endif 218 pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 219 if (pr == NULL) 220 panic("ip6_init"); 221 222 /* Initialize the entire ip6_protox[] array to IPPROTO_RAW. */ 223 for (i = 0; i < IPPROTO_MAX; i++) 224 ip6_protox[i] = pr - inet6sw; 225 /* 226 * Cycle through IP protocols and put them into the appropriate place 227 * in ip6_protox[]. 228 */ 229 for (pr = (struct ip6protosw *)inet6domain.dom_protosw; 230 pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++) 231 if (pr->pr_domain->dom_family == PF_INET6 && 232 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) { 233 /* Be careful to only index valid IP protocols. */ 234 if (pr->pr_protocol < IPPROTO_MAX) 235 ip6_protox[pr->pr_protocol] = pr - inet6sw; 236 } 237 238 netisr_register(&ip6_nh); 239 } 240 241 /* 242 * The protocol to be inserted into ip6_protox[] must be already registered 243 * in inet6sw[], either statically or through pf_proto_register(). 244 */ 245 int 246 ip6proto_register(short ip6proto) 247 { 248 struct ip6protosw *pr; 249 250 /* Sanity checks. */ 251 if (ip6proto <= 0 || ip6proto >= IPPROTO_MAX) 252 return (EPROTONOSUPPORT); 253 254 /* 255 * The protocol slot must not be occupied by another protocol 256 * already. An index pointing to IPPROTO_RAW is unused. 257 */ 258 pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 259 if (pr == NULL) 260 return (EPFNOSUPPORT); 261 if (ip6_protox[ip6proto] != pr - inet6sw) /* IPPROTO_RAW */ 262 return (EEXIST); 263 264 /* 265 * Find the protocol position in inet6sw[] and set the index. 266 */ 267 for (pr = (struct ip6protosw *)inet6domain.dom_protosw; 268 pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++) { 269 if (pr->pr_domain->dom_family == PF_INET6 && 270 pr->pr_protocol && pr->pr_protocol == ip6proto) { 271 ip6_protox[pr->pr_protocol] = pr - inet6sw; 272 return (0); 273 } 274 } 275 return (EPROTONOSUPPORT); 276 } 277 278 int 279 ip6proto_unregister(short ip6proto) 280 { 281 struct ip6protosw *pr; 282 283 /* Sanity checks. */ 284 if (ip6proto <= 0 || ip6proto >= IPPROTO_MAX) 285 return (EPROTONOSUPPORT); 286 287 /* Check if the protocol was indeed registered. */ 288 pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 289 if (pr == NULL) 290 return (EPFNOSUPPORT); 291 if (ip6_protox[ip6proto] == pr - inet6sw) /* IPPROTO_RAW */ 292 return (ENOENT); 293 294 /* Reset the protocol slot to IPPROTO_RAW. */ 295 ip6_protox[ip6proto] = pr - inet6sw; 296 return (0); 297 } 298 299 #ifdef VIMAGE 300 void 301 ip6_destroy() 302 { 303 304 hashdestroy(V_in6_ifaddrhashtbl, M_IFADDR, V_in6_ifaddrhmask); 305 nd6_destroy(); 306 callout_drain(&V_in6_tmpaddrtimer_ch); 307 } 308 #endif 309 310 static int 311 ip6_init2_vnet(const void *unused __unused) 312 { 313 314 /* nd6_timer_init */ 315 callout_init(&V_nd6_timer_ch, 0); 316 callout_reset(&V_nd6_timer_ch, hz, nd6_timer, curvnet); 317 318 /* timer for regeneranation of temporary addresses randomize ID */ 319 callout_init(&V_in6_tmpaddrtimer_ch, 0); 320 callout_reset(&V_in6_tmpaddrtimer_ch, 321 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor - 322 V_ip6_temp_regen_advance) * hz, 323 in6_tmpaddrtimer, curvnet); 324 325 return (0); 326 } 327 328 static void 329 ip6_init2(void *dummy) 330 { 331 332 ip6_init2_vnet(NULL); 333 } 334 335 /* cheat */ 336 /* This must be after route_init(), which is now SI_ORDER_THIRD */ 337 SYSINIT(netinet6init2, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ip6_init2, NULL); 338 339 static int 340 ip6_input_hbh(struct mbuf *m, uint32_t *plen, uint32_t *rtalert, int *off, 341 int *nxt, int *ours) 342 { 343 struct ip6_hdr *ip6; 344 struct ip6_hbh *hbh; 345 346 if (ip6_hopopts_input(plen, rtalert, &m, off)) { 347 #if 0 /*touches NULL pointer*/ 348 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 349 #endif 350 goto out; /* m have already been freed */ 351 } 352 353 /* adjust pointer */ 354 ip6 = mtod(m, struct ip6_hdr *); 355 356 /* 357 * if the payload length field is 0 and the next header field 358 * indicates Hop-by-Hop Options header, then a Jumbo Payload 359 * option MUST be included. 360 */ 361 if (ip6->ip6_plen == 0 && *plen == 0) { 362 /* 363 * Note that if a valid jumbo payload option is 364 * contained, ip6_hopopts_input() must set a valid 365 * (non-zero) payload length to the variable plen. 366 */ 367 V_ip6stat.ip6s_badoptions++; 368 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 369 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 370 icmp6_error(m, ICMP6_PARAM_PROB, 371 ICMP6_PARAMPROB_HEADER, 372 (caddr_t)&ip6->ip6_plen - (caddr_t)ip6); 373 goto out; 374 } 375 #ifndef PULLDOWN_TEST 376 /* ip6_hopopts_input() ensures that mbuf is contiguous */ 377 hbh = (struct ip6_hbh *)(ip6 + 1); 378 #else 379 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 380 sizeof(struct ip6_hbh)); 381 if (hbh == NULL) { 382 V_ip6stat.ip6s_tooshort++; 383 goto out; 384 } 385 #endif 386 *nxt = hbh->ip6h_nxt; 387 388 /* 389 * If we are acting as a router and the packet contains a 390 * router alert option, see if we know the option value. 391 * Currently, we only support the option value for MLD, in which 392 * case we should pass the packet to the multicast routing 393 * daemon. 394 */ 395 if (*rtalert != ~0) { 396 switch (*rtalert) { 397 case IP6OPT_RTALERT_MLD: 398 if (V_ip6_forwarding) 399 *ours = 1; 400 break; 401 default: 402 /* 403 * RFC2711 requires unrecognized values must be 404 * silently ignored. 405 */ 406 break; 407 } 408 } 409 410 return (0); 411 412 out: 413 return (1); 414 } 415 416 void 417 ip6_input(struct mbuf *m) 418 { 419 struct ip6_hdr *ip6; 420 int off = sizeof(struct ip6_hdr), nest; 421 u_int32_t plen; 422 u_int32_t rtalert = ~0; 423 int nxt, ours = 0; 424 struct ifnet *deliverifp = NULL, *ifp = NULL; 425 struct in6_addr odst; 426 struct route_in6 rin6; 427 int srcrt = 0; 428 struct llentry *lle = NULL; 429 struct sockaddr_in6 dst6, *dst; 430 431 bzero(&rin6, sizeof(struct route_in6)); 432 #ifdef IPSEC 433 /* 434 * should the inner packet be considered authentic? 435 * see comment in ah4_input(). 436 * NB: m cannot be NULL when passed to the input routine 437 */ 438 439 m->m_flags &= ~M_AUTHIPHDR; 440 m->m_flags &= ~M_AUTHIPDGM; 441 442 #endif /* IPSEC */ 443 444 /* 445 * make sure we don't have onion peering information into m_tag. 446 */ 447 ip6_delaux(m); 448 449 if (m->m_flags & M_FASTFWD_OURS) { 450 /* 451 * Firewall changed destination to local. 452 */ 453 m->m_flags &= ~M_FASTFWD_OURS; 454 ours = 1; 455 deliverifp = m->m_pkthdr.rcvif; 456 ip6 = mtod(m, struct ip6_hdr *); 457 goto hbhcheck; 458 } 459 460 /* 461 * mbuf statistics 462 */ 463 if (m->m_flags & M_EXT) { 464 if (m->m_next) 465 V_ip6stat.ip6s_mext2m++; 466 else 467 V_ip6stat.ip6s_mext1++; 468 } else { 469 #define M2MMAX (sizeof(V_ip6stat.ip6s_m2m)/sizeof(V_ip6stat.ip6s_m2m[0])) 470 if (m->m_next) { 471 if (m->m_flags & M_LOOP) { 472 V_ip6stat.ip6s_m2m[V_loif->if_index]++; 473 } else if (m->m_pkthdr.rcvif->if_index < M2MMAX) 474 V_ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++; 475 else 476 V_ip6stat.ip6s_m2m[0]++; 477 } else 478 V_ip6stat.ip6s_m1++; 479 #undef M2MMAX 480 } 481 482 /* drop the packet if IPv6 operation is disabled on the IF */ 483 if ((ND_IFINFO(m->m_pkthdr.rcvif)->flags & ND6_IFF_IFDISABLED)) { 484 m_freem(m); 485 return; 486 } 487 488 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive); 489 V_ip6stat.ip6s_total++; 490 491 #ifndef PULLDOWN_TEST 492 /* 493 * L2 bridge code and some other code can return mbuf chain 494 * that does not conform to KAME requirement. too bad. 495 * XXX: fails to join if interface MTU > MCLBYTES. jumbogram? 496 */ 497 if (m && m->m_next != NULL && m->m_pkthdr.len < MCLBYTES) { 498 struct mbuf *n; 499 500 MGETHDR(n, M_NOWAIT, MT_HEADER); 501 if (n) 502 M_MOVE_PKTHDR(n, m); 503 if (n && n->m_pkthdr.len > MHLEN) { 504 MCLGET(n, M_NOWAIT); 505 if ((n->m_flags & M_EXT) == 0) { 506 m_freem(n); 507 n = NULL; 508 } 509 } 510 if (n == NULL) { 511 m_freem(m); 512 return; /* ENOBUFS */ 513 } 514 515 m_copydata(m, 0, n->m_pkthdr.len, mtod(n, caddr_t)); 516 n->m_len = n->m_pkthdr.len; 517 m_freem(m); 518 m = n; 519 } 520 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), /* nothing */); 521 #endif 522 523 if (m->m_len < sizeof(struct ip6_hdr)) { 524 struct ifnet *inifp; 525 inifp = m->m_pkthdr.rcvif; 526 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 527 V_ip6stat.ip6s_toosmall++; 528 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 529 return; 530 } 531 } 532 533 ip6 = mtod(m, struct ip6_hdr *); 534 535 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 536 V_ip6stat.ip6s_badvers++; 537 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 538 goto bad; 539 } 540 541 V_ip6stat.ip6s_nxthist[ip6->ip6_nxt]++; 542 543 /* 544 * Check against address spoofing/corruption. 545 */ 546 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) || 547 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) { 548 /* 549 * XXX: "badscope" is not very suitable for a multicast source. 550 */ 551 V_ip6stat.ip6s_badscope++; 552 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 553 goto bad; 554 } 555 if (IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) && 556 !(m->m_flags & M_LOOP)) { 557 /* 558 * In this case, the packet should come from the loopback 559 * interface. However, we cannot just check the if_flags, 560 * because ip6_mloopback() passes the "actual" interface 561 * as the outgoing/incoming interface. 562 */ 563 V_ip6stat.ip6s_badscope++; 564 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 565 goto bad; 566 } 567 568 #ifdef ALTQ 569 if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) { 570 /* packet is dropped by traffic conditioner */ 571 return; 572 } 573 #endif 574 /* 575 * The following check is not documented in specs. A malicious 576 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack 577 * and bypass security checks (act as if it was from 127.0.0.1 by using 578 * IPv6 src ::ffff:127.0.0.1). Be cautious. 579 * 580 * This check chokes if we are in an SIIT cloud. As none of BSDs 581 * support IPv4-less kernel compilation, we cannot support SIIT 582 * environment at all. So, it makes more sense for us to reject any 583 * malicious packets for non-SIIT environment, than try to do a 584 * partial support for SIIT environment. 585 */ 586 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 587 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 588 V_ip6stat.ip6s_badscope++; 589 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 590 goto bad; 591 } 592 #if 0 593 /* 594 * Reject packets with IPv4 compatible addresses (auto tunnel). 595 * 596 * The code forbids auto tunnel relay case in RFC1933 (the check is 597 * stronger than RFC1933). We may want to re-enable it if mech-xx 598 * is revised to forbid relaying case. 599 */ 600 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) || 601 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) { 602 V_ip6stat.ip6s_badscope++; 603 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 604 goto bad; 605 } 606 #endif 607 #ifdef IPSEC 608 /* 609 * Bypass packet filtering for packets previously handled by IPsec. 610 */ 611 if (ip6_ipsec_filtertunnel(m)) 612 goto passin; 613 #endif /* IPSEC */ 614 615 /* 616 * Run through list of hooks for input packets. 617 * 618 * NB: Beware of the destination address changing 619 * (e.g. by NAT rewriting). When this happens, 620 * tell ip6_forward to do the right thing. 621 */ 622 odst = ip6->ip6_dst; 623 624 /* Jump over all PFIL processing if hooks are not active. */ 625 if (!PFIL_HOOKED(&V_inet6_pfil_hook)) 626 goto passin; 627 628 if (pfil_run_hooks(&V_inet6_pfil_hook, &m, 629 m->m_pkthdr.rcvif, PFIL_IN, NULL)) 630 return; 631 if (m == NULL) /* consumed by filter */ 632 return; 633 ip6 = mtod(m, struct ip6_hdr *); 634 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst); 635 636 if (m->m_flags & M_FASTFWD_OURS) { 637 m->m_flags &= ~M_FASTFWD_OURS; 638 ours = 1; 639 deliverifp = m->m_pkthdr.rcvif; 640 goto hbhcheck; 641 } 642 if ((m->m_flags & M_IP6_NEXTHOP) && 643 m_tag_find(m, PACKET_TAG_IPFORWARD, NULL) != NULL) { 644 /* 645 * Directly ship the packet on. This allows forwarding 646 * packets originally destined to us to some other directly 647 * connected host. 648 */ 649 ip6_forward(m, 1); 650 goto out; 651 } 652 653 passin: 654 /* 655 * Disambiguate address scope zones (if there is ambiguity). 656 * We first make sure that the original source or destination address 657 * is not in our internal form for scoped addresses. Such addresses 658 * are not necessarily invalid spec-wise, but we cannot accept them due 659 * to the usage conflict. 660 * in6_setscope() then also checks and rejects the cases where src or 661 * dst are the loopback address and the receiving interface 662 * is not loopback. 663 */ 664 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) { 665 V_ip6stat.ip6s_badscope++; /* XXX */ 666 goto bad; 667 } 668 if (in6_setscope(&ip6->ip6_src, m->m_pkthdr.rcvif, NULL) || 669 in6_setscope(&ip6->ip6_dst, m->m_pkthdr.rcvif, NULL)) { 670 V_ip6stat.ip6s_badscope++; 671 goto bad; 672 } 673 674 /* 675 * Multicast check. Assume packet is for us to avoid 676 * prematurely taking locks. 677 */ 678 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 679 ours = 1; 680 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast); 681 deliverifp = m->m_pkthdr.rcvif; 682 goto hbhcheck; 683 } 684 685 /* 686 * Unicast check 687 */ 688 689 bzero(&dst6, sizeof(dst6)); 690 dst6.sin6_family = AF_INET6; 691 dst6.sin6_len = sizeof(struct sockaddr_in6); 692 dst6.sin6_addr = ip6->ip6_dst; 693 ifp = m->m_pkthdr.rcvif; 694 IF_AFDATA_RLOCK(ifp); 695 lle = lla_lookup(LLTABLE6(ifp), 0, 696 (struct sockaddr *)&dst6); 697 IF_AFDATA_RUNLOCK(ifp); 698 if ((lle != NULL) && (lle->la_flags & LLE_IFADDR)) { 699 struct ifaddr *ifa; 700 struct in6_ifaddr *ia6; 701 int bad; 702 703 bad = 1; 704 #define sa_equal(a1, a2) \ 705 (bcmp((a1), (a2), ((a1))->sin6_len) == 0) 706 IF_ADDR_RLOCK(ifp); 707 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 708 if (ifa->ifa_addr->sa_family != dst6.sin6_family) 709 continue; 710 if (sa_equal(&dst6, ifa->ifa_addr)) 711 break; 712 } 713 KASSERT(ifa != NULL, ("%s: ifa not found for lle %p", 714 __func__, lle)); 715 #undef sa_equal 716 717 ia6 = (struct in6_ifaddr *)ifa; 718 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) { 719 /* Count the packet in the ip address stats */ 720 ia6->ia_ifa.if_ipackets++; 721 ia6->ia_ifa.if_ibytes += m->m_pkthdr.len; 722 723 /* 724 * record address information into m_tag. 725 */ 726 (void)ip6_setdstifaddr(m, ia6); 727 728 bad = 0; 729 } else { 730 char ip6bufs[INET6_ADDRSTRLEN]; 731 char ip6bufd[INET6_ADDRSTRLEN]; 732 /* address is not ready, so discard the packet. */ 733 nd6log((LOG_INFO, 734 "ip6_input: packet to an unready address %s->%s\n", 735 ip6_sprintf(ip6bufs, &ip6->ip6_src), 736 ip6_sprintf(ip6bufd, &ip6->ip6_dst))); 737 } 738 IF_ADDR_RUNLOCK(ifp); 739 LLE_RUNLOCK(lle); 740 if (bad) 741 goto bad; 742 else { 743 ours = 1; 744 deliverifp = ifp; 745 goto hbhcheck; 746 } 747 } 748 if (lle != NULL) 749 LLE_RUNLOCK(lle); 750 751 dst = &rin6.ro_dst; 752 dst->sin6_len = sizeof(struct sockaddr_in6); 753 dst->sin6_family = AF_INET6; 754 dst->sin6_addr = ip6->ip6_dst; 755 rin6.ro_rt = in6_rtalloc1((struct sockaddr *)dst, 0, 0, M_GETFIB(m)); 756 if (rin6.ro_rt) 757 RT_UNLOCK(rin6.ro_rt); 758 759 #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key)) 760 761 /* 762 * Accept the packet if the forwarding interface to the destination 763 * according to the routing table is the loopback interface, 764 * unless the associated route has a gateway. 765 * Note that this approach causes to accept a packet if there is a 766 * route to the loopback interface for the destination of the packet. 767 * But we think it's even useful in some situations, e.g. when using 768 * a special daemon which wants to intercept the packet. 769 * 770 * XXX: some OSes automatically make a cloned route for the destination 771 * of an outgoing packet. If the outgoing interface of the packet 772 * is a loopback one, the kernel would consider the packet to be 773 * accepted, even if we have no such address assinged on the interface. 774 * We check the cloned flag of the route entry to reject such cases, 775 * assuming that route entries for our own addresses are not made by 776 * cloning (it should be true because in6_addloop explicitly installs 777 * the host route). However, we might have to do an explicit check 778 * while it would be less efficient. Or, should we rather install a 779 * reject route for such a case? 780 */ 781 if (rin6.ro_rt && 782 (rin6.ro_rt->rt_flags & 783 (RTF_HOST|RTF_GATEWAY)) == RTF_HOST && 784 #ifdef RTF_WASCLONED 785 !(rin6.ro_rt->rt_flags & RTF_WASCLONED) && 786 #endif 787 #ifdef RTF_CLONED 788 !(rin6.ro_rt->rt_flags & RTF_CLONED) && 789 #endif 790 #if 0 791 /* 792 * The check below is redundant since the comparison of 793 * the destination and the key of the rtentry has 794 * already done through looking up the routing table. 795 */ 796 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 797 &rt6_key(rin6.ro_rt)->sin6_addr) 798 #endif 799 rin6.ro_rt->rt_ifp->if_type == IFT_LOOP) { 800 int free_ia6 = 0; 801 struct in6_ifaddr *ia6; 802 803 /* 804 * found the loopback route to the interface address 805 */ 806 if (rin6.ro_rt->rt_gateway->sa_family == AF_LINK) { 807 struct sockaddr_in6 dest6; 808 809 bzero(&dest6, sizeof(dest6)); 810 dest6.sin6_family = AF_INET6; 811 dest6.sin6_len = sizeof(dest6); 812 dest6.sin6_addr = ip6->ip6_dst; 813 ia6 = (struct in6_ifaddr *) 814 ifa_ifwithaddr((struct sockaddr *)&dest6); 815 if (ia6 == NULL) 816 goto bad; 817 free_ia6 = 1; 818 } 819 else 820 ia6 = (struct in6_ifaddr *)rin6.ro_rt->rt_ifa; 821 822 /* 823 * record address information into m_tag. 824 */ 825 (void)ip6_setdstifaddr(m, ia6); 826 827 /* 828 * packets to a tentative, duplicated, or somehow invalid 829 * address must not be accepted. 830 */ 831 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) { 832 /* this address is ready */ 833 ours = 1; 834 deliverifp = ia6->ia_ifp; /* correct? */ 835 /* Count the packet in the ip address stats */ 836 ia6->ia_ifa.if_ipackets++; 837 ia6->ia_ifa.if_ibytes += m->m_pkthdr.len; 838 if (ia6 != NULL && free_ia6 != 0) 839 ifa_free(&ia6->ia_ifa); 840 goto hbhcheck; 841 } else { 842 char ip6bufs[INET6_ADDRSTRLEN]; 843 char ip6bufd[INET6_ADDRSTRLEN]; 844 /* address is not ready, so discard the packet. */ 845 nd6log((LOG_INFO, 846 "ip6_input: packet to an unready address %s->%s\n", 847 ip6_sprintf(ip6bufs, &ip6->ip6_src), 848 ip6_sprintf(ip6bufd, &ip6->ip6_dst))); 849 850 if (ia6 != NULL && free_ia6 != 0) 851 ifa_free(&ia6->ia_ifa); 852 goto bad; 853 } 854 } 855 856 /* 857 * FAITH (Firewall Aided Internet Translator) 858 */ 859 if (V_ip6_keepfaith) { 860 if (rin6.ro_rt && rin6.ro_rt->rt_ifp && 861 rin6.ro_rt->rt_ifp->if_type == IFT_FAITH) { 862 /* XXX do we need more sanity checks? */ 863 ours = 1; 864 deliverifp = rin6.ro_rt->rt_ifp; /* faith */ 865 goto hbhcheck; 866 } 867 } 868 869 /* 870 * Now there is no reason to process the packet if it's not our own 871 * and we're not a router. 872 */ 873 if (!V_ip6_forwarding) { 874 V_ip6stat.ip6s_cantforward++; 875 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 876 goto bad; 877 } 878 879 hbhcheck: 880 /* 881 * record address information into m_tag, if we don't have one yet. 882 * note that we are unable to record it, if the address is not listed 883 * as our interface address (e.g. multicast addresses, addresses 884 * within FAITH prefixes and such). 885 */ 886 if (deliverifp) { 887 struct in6_ifaddr *ia6; 888 889 if ((ia6 = ip6_getdstifaddr(m)) != NULL) { 890 ifa_free(&ia6->ia_ifa); 891 } else { 892 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 893 if (ia6) { 894 if (!ip6_setdstifaddr(m, ia6)) { 895 /* 896 * XXX maybe we should drop the packet here, 897 * as we could not provide enough information 898 * to the upper layers. 899 */ 900 } 901 ifa_free(&ia6->ia_ifa); 902 } 903 } 904 } 905 906 /* 907 * Process Hop-by-Hop options header if it's contained. 908 * m may be modified in ip6_hopopts_input(). 909 * If a JumboPayload option is included, plen will also be modified. 910 */ 911 plen = (u_int32_t)ntohs(ip6->ip6_plen); 912 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 913 int error; 914 915 error = ip6_input_hbh(m, &plen, &rtalert, &off, &nxt, &ours); 916 if (error != 0) 917 goto out; 918 } else 919 nxt = ip6->ip6_nxt; 920 921 /* 922 * Check that the amount of data in the buffers 923 * is as at least much as the IPv6 header would have us expect. 924 * Trim mbufs if longer than we expect. 925 * Drop packet if shorter than we expect. 926 */ 927 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 928 V_ip6stat.ip6s_tooshort++; 929 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 930 goto bad; 931 } 932 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 933 if (m->m_len == m->m_pkthdr.len) { 934 m->m_len = sizeof(struct ip6_hdr) + plen; 935 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 936 } else 937 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 938 } 939 940 /* 941 * Forward if desirable. 942 */ 943 if (V_ip6_mrouter && 944 IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 945 /* 946 * If we are acting as a multicast router, all 947 * incoming multicast packets are passed to the 948 * kernel-level multicast forwarding function. 949 * The packet is returned (relatively) intact; if 950 * ip6_mforward() returns a non-zero value, the packet 951 * must be discarded, else it may be accepted below. 952 * 953 * XXX TODO: Check hlim and multicast scope here to avoid 954 * unnecessarily calling into ip6_mforward(). 955 */ 956 if (ip6_mforward && 957 ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) { 958 IP6STAT_INC(ip6s_cantforward); 959 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 960 goto bad; 961 } 962 } else if (!ours) { 963 ip6_forward(m, srcrt); 964 goto out; 965 } 966 967 ip6 = mtod(m, struct ip6_hdr *); 968 969 /* 970 * Malicious party may be able to use IPv4 mapped addr to confuse 971 * tcp/udp stack and bypass security checks (act as if it was from 972 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious. 973 * 974 * For SIIT end node behavior, you may want to disable the check. 975 * However, you will become vulnerable to attacks using IPv4 mapped 976 * source. 977 */ 978 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 979 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 980 V_ip6stat.ip6s_badscope++; 981 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 982 goto bad; 983 } 984 985 /* 986 * Tell launch routine the next header 987 */ 988 V_ip6stat.ip6s_delivered++; 989 in6_ifstat_inc(deliverifp, ifs6_in_deliver); 990 nest = 0; 991 992 while (nxt != IPPROTO_DONE) { 993 if (V_ip6_hdrnestlimit && (++nest > V_ip6_hdrnestlimit)) { 994 V_ip6stat.ip6s_toomanyhdr++; 995 goto bad; 996 } 997 998 /* 999 * protection against faulty packet - there should be 1000 * more sanity checks in header chain processing. 1001 */ 1002 if (m->m_pkthdr.len < off) { 1003 V_ip6stat.ip6s_tooshort++; 1004 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 1005 goto bad; 1006 } 1007 1008 #ifdef IPSEC 1009 /* 1010 * enforce IPsec policy checking if we are seeing last header. 1011 * note that we do not visit this with protocols with pcb layer 1012 * code - like udp/tcp/raw ip. 1013 */ 1014 if (ip6_ipsec_input(m, nxt)) 1015 goto bad; 1016 #endif /* IPSEC */ 1017 1018 /* 1019 * Use mbuf flags to propagate Router Alert option to 1020 * ICMPv6 layer, as hop-by-hop options have been stripped. 1021 */ 1022 if (nxt == IPPROTO_ICMPV6 && rtalert != ~0) 1023 m->m_flags |= M_RTALERT_MLD; 1024 1025 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt); 1026 } 1027 goto out; 1028 bad: 1029 m_freem(m); 1030 out: 1031 if (rin6.ro_rt) 1032 RTFREE(rin6.ro_rt); 1033 } 1034 1035 /* 1036 * set/grab in6_ifaddr correspond to IPv6 destination address. 1037 * XXX backward compatibility wrapper 1038 * 1039 * XXXRW: We should bump the refcount on ia6 before sticking it in the m_tag, 1040 * and then bump it when the tag is copied, and release it when the tag is 1041 * freed. Unfortunately, m_tags don't support deep copies (yet), so instead 1042 * we just bump the ia refcount when we receive it. This should be fixed. 1043 */ 1044 static struct ip6aux * 1045 ip6_setdstifaddr(struct mbuf *m, struct in6_ifaddr *ia6) 1046 { 1047 struct ip6aux *ip6a; 1048 1049 ip6a = ip6_addaux(m); 1050 if (ip6a) 1051 ip6a->ip6a_dstia6 = ia6; 1052 return ip6a; /* NULL if failed to set */ 1053 } 1054 1055 struct in6_ifaddr * 1056 ip6_getdstifaddr(struct mbuf *m) 1057 { 1058 struct ip6aux *ip6a; 1059 struct in6_ifaddr *ia; 1060 1061 ip6a = ip6_findaux(m); 1062 if (ip6a) { 1063 ia = ip6a->ip6a_dstia6; 1064 ifa_ref(&ia->ia_ifa); 1065 return ia; 1066 } else 1067 return NULL; 1068 } 1069 1070 /* 1071 * Hop-by-Hop options header processing. If a valid jumbo payload option is 1072 * included, the real payload length will be stored in plenp. 1073 * 1074 * rtalertp - XXX: should be stored more smart way 1075 */ 1076 static int 1077 ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp, 1078 struct mbuf **mp, int *offp) 1079 { 1080 struct mbuf *m = *mp; 1081 int off = *offp, hbhlen; 1082 struct ip6_hbh *hbh; 1083 u_int8_t *opt; 1084 1085 /* validation of the length of the header */ 1086 #ifndef PULLDOWN_TEST 1087 IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1); 1088 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); 1089 hbhlen = (hbh->ip6h_len + 1) << 3; 1090 1091 IP6_EXTHDR_CHECK(m, off, hbhlen, -1); 1092 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); 1093 #else 1094 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, 1095 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh)); 1096 if (hbh == NULL) { 1097 V_ip6stat.ip6s_tooshort++; 1098 return -1; 1099 } 1100 hbhlen = (hbh->ip6h_len + 1) << 3; 1101 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 1102 hbhlen); 1103 if (hbh == NULL) { 1104 V_ip6stat.ip6s_tooshort++; 1105 return -1; 1106 } 1107 #endif 1108 off += hbhlen; 1109 hbhlen -= sizeof(struct ip6_hbh); 1110 opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh); 1111 1112 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 1113 hbhlen, rtalertp, plenp) < 0) 1114 return (-1); 1115 1116 *offp = off; 1117 *mp = m; 1118 return (0); 1119 } 1120 1121 /* 1122 * Search header for all Hop-by-hop options and process each option. 1123 * This function is separate from ip6_hopopts_input() in order to 1124 * handle a case where the sending node itself process its hop-by-hop 1125 * options header. In such a case, the function is called from ip6_output(). 1126 * 1127 * The function assumes that hbh header is located right after the IPv6 header 1128 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to 1129 * opthead + hbhlen is located in contiguous memory region. 1130 */ 1131 int 1132 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen, 1133 u_int32_t *rtalertp, u_int32_t *plenp) 1134 { 1135 struct ip6_hdr *ip6; 1136 int optlen = 0; 1137 u_int8_t *opt = opthead; 1138 u_int16_t rtalert_val; 1139 u_int32_t jumboplen; 1140 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh); 1141 1142 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 1143 switch (*opt) { 1144 case IP6OPT_PAD1: 1145 optlen = 1; 1146 break; 1147 case IP6OPT_PADN: 1148 if (hbhlen < IP6OPT_MINLEN) { 1149 V_ip6stat.ip6s_toosmall++; 1150 goto bad; 1151 } 1152 optlen = *(opt + 1) + 2; 1153 break; 1154 case IP6OPT_ROUTER_ALERT: 1155 /* XXX may need check for alignment */ 1156 if (hbhlen < IP6OPT_RTALERT_LEN) { 1157 V_ip6stat.ip6s_toosmall++; 1158 goto bad; 1159 } 1160 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) { 1161 /* XXX stat */ 1162 icmp6_error(m, ICMP6_PARAM_PROB, 1163 ICMP6_PARAMPROB_HEADER, 1164 erroff + opt + 1 - opthead); 1165 return (-1); 1166 } 1167 optlen = IP6OPT_RTALERT_LEN; 1168 bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2); 1169 *rtalertp = ntohs(rtalert_val); 1170 break; 1171 case IP6OPT_JUMBO: 1172 /* XXX may need check for alignment */ 1173 if (hbhlen < IP6OPT_JUMBO_LEN) { 1174 V_ip6stat.ip6s_toosmall++; 1175 goto bad; 1176 } 1177 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) { 1178 /* XXX stat */ 1179 icmp6_error(m, ICMP6_PARAM_PROB, 1180 ICMP6_PARAMPROB_HEADER, 1181 erroff + opt + 1 - opthead); 1182 return (-1); 1183 } 1184 optlen = IP6OPT_JUMBO_LEN; 1185 1186 /* 1187 * IPv6 packets that have non 0 payload length 1188 * must not contain a jumbo payload option. 1189 */ 1190 ip6 = mtod(m, struct ip6_hdr *); 1191 if (ip6->ip6_plen) { 1192 V_ip6stat.ip6s_badoptions++; 1193 icmp6_error(m, ICMP6_PARAM_PROB, 1194 ICMP6_PARAMPROB_HEADER, 1195 erroff + opt - opthead); 1196 return (-1); 1197 } 1198 1199 /* 1200 * We may see jumbolen in unaligned location, so 1201 * we'd need to perform bcopy(). 1202 */ 1203 bcopy(opt + 2, &jumboplen, sizeof(jumboplen)); 1204 jumboplen = (u_int32_t)htonl(jumboplen); 1205 1206 #if 1 1207 /* 1208 * if there are multiple jumbo payload options, 1209 * *plenp will be non-zero and the packet will be 1210 * rejected. 1211 * the behavior may need some debate in ipngwg - 1212 * multiple options does not make sense, however, 1213 * there's no explicit mention in specification. 1214 */ 1215 if (*plenp != 0) { 1216 V_ip6stat.ip6s_badoptions++; 1217 icmp6_error(m, ICMP6_PARAM_PROB, 1218 ICMP6_PARAMPROB_HEADER, 1219 erroff + opt + 2 - opthead); 1220 return (-1); 1221 } 1222 #endif 1223 1224 /* 1225 * jumbo payload length must be larger than 65535. 1226 */ 1227 if (jumboplen <= IPV6_MAXPACKET) { 1228 V_ip6stat.ip6s_badoptions++; 1229 icmp6_error(m, ICMP6_PARAM_PROB, 1230 ICMP6_PARAMPROB_HEADER, 1231 erroff + opt + 2 - opthead); 1232 return (-1); 1233 } 1234 *plenp = jumboplen; 1235 1236 break; 1237 default: /* unknown option */ 1238 if (hbhlen < IP6OPT_MINLEN) { 1239 V_ip6stat.ip6s_toosmall++; 1240 goto bad; 1241 } 1242 optlen = ip6_unknown_opt(opt, m, 1243 erroff + opt - opthead); 1244 if (optlen == -1) 1245 return (-1); 1246 optlen += 2; 1247 break; 1248 } 1249 } 1250 1251 return (0); 1252 1253 bad: 1254 m_freem(m); 1255 return (-1); 1256 } 1257 1258 /* 1259 * Unknown option processing. 1260 * The third argument `off' is the offset from the IPv6 header to the option, 1261 * which is necessary if the IPv6 header the and option header and IPv6 header 1262 * is not contiguous in order to return an ICMPv6 error. 1263 */ 1264 int 1265 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off) 1266 { 1267 struct ip6_hdr *ip6; 1268 1269 switch (IP6OPT_TYPE(*optp)) { 1270 case IP6OPT_TYPE_SKIP: /* ignore the option */ 1271 return ((int)*(optp + 1)); 1272 case IP6OPT_TYPE_DISCARD: /* silently discard */ 1273 m_freem(m); 1274 return (-1); 1275 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 1276 V_ip6stat.ip6s_badoptions++; 1277 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 1278 return (-1); 1279 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 1280 V_ip6stat.ip6s_badoptions++; 1281 ip6 = mtod(m, struct ip6_hdr *); 1282 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 1283 (m->m_flags & (M_BCAST|M_MCAST))) 1284 m_freem(m); 1285 else 1286 icmp6_error(m, ICMP6_PARAM_PROB, 1287 ICMP6_PARAMPROB_OPTION, off); 1288 return (-1); 1289 } 1290 1291 m_freem(m); /* XXX: NOTREACHED */ 1292 return (-1); 1293 } 1294 1295 /* 1296 * Create the "control" list for this pcb. 1297 * These functions will not modify mbuf chain at all. 1298 * 1299 * With KAME mbuf chain restriction: 1300 * The routine will be called from upper layer handlers like tcp6_input(). 1301 * Thus the routine assumes that the caller (tcp6_input) have already 1302 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the 1303 * very first mbuf on the mbuf chain. 1304 * 1305 * ip6_savecontrol_v4 will handle those options that are possible to be 1306 * set on a v4-mapped socket. 1307 * ip6_savecontrol will directly call ip6_savecontrol_v4 to handle those 1308 * options and handle the v6-only ones itself. 1309 */ 1310 struct mbuf ** 1311 ip6_savecontrol_v4(struct inpcb *inp, struct mbuf *m, struct mbuf **mp, 1312 int *v4only) 1313 { 1314 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1315 1316 #ifdef SO_TIMESTAMP 1317 if ((inp->inp_socket->so_options & SO_TIMESTAMP) != 0) { 1318 struct timeval tv; 1319 1320 microtime(&tv); 1321 *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv), 1322 SCM_TIMESTAMP, SOL_SOCKET); 1323 if (*mp) 1324 mp = &(*mp)->m_next; 1325 } 1326 #endif 1327 1328 #define IS2292(inp, x, y) (((inp)->inp_flags & IN6P_RFC2292) ? (x) : (y)) 1329 /* RFC 2292 sec. 5 */ 1330 if ((inp->inp_flags & IN6P_PKTINFO) != 0) { 1331 struct in6_pktinfo pi6; 1332 1333 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1334 #ifdef INET 1335 struct ip *ip; 1336 1337 ip = mtod(m, struct ip *); 1338 pi6.ipi6_addr.s6_addr32[0] = 0; 1339 pi6.ipi6_addr.s6_addr32[1] = 0; 1340 pi6.ipi6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP; 1341 pi6.ipi6_addr.s6_addr32[3] = ip->ip_dst.s_addr; 1342 #else 1343 /* We won't hit this code */ 1344 bzero(&pi6.ipi6_addr, sizeof(struct in6_addr)); 1345 #endif 1346 } else { 1347 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr)); 1348 in6_clearscope(&pi6.ipi6_addr); /* XXX */ 1349 } 1350 pi6.ipi6_ifindex = 1351 (m && m->m_pkthdr.rcvif) ? m->m_pkthdr.rcvif->if_index : 0; 1352 1353 *mp = sbcreatecontrol((caddr_t) &pi6, 1354 sizeof(struct in6_pktinfo), 1355 IS2292(inp, IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6); 1356 if (*mp) 1357 mp = &(*mp)->m_next; 1358 } 1359 1360 if ((inp->inp_flags & IN6P_HOPLIMIT) != 0) { 1361 int hlim; 1362 1363 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1364 #ifdef INET 1365 struct ip *ip; 1366 1367 ip = mtod(m, struct ip *); 1368 hlim = ip->ip_ttl; 1369 #else 1370 /* We won't hit this code */ 1371 hlim = 0; 1372 #endif 1373 } else { 1374 hlim = ip6->ip6_hlim & 0xff; 1375 } 1376 *mp = sbcreatecontrol((caddr_t) &hlim, sizeof(int), 1377 IS2292(inp, IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), 1378 IPPROTO_IPV6); 1379 if (*mp) 1380 mp = &(*mp)->m_next; 1381 } 1382 1383 if ((inp->inp_flags & IN6P_TCLASS) != 0) { 1384 int tclass; 1385 1386 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1387 #ifdef INET 1388 struct ip *ip; 1389 1390 ip = mtod(m, struct ip *); 1391 tclass = ip->ip_tos; 1392 #else 1393 /* We won't hit this code */ 1394 tclass = 0; 1395 #endif 1396 } else { 1397 u_int32_t flowinfo; 1398 1399 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK); 1400 flowinfo >>= 20; 1401 tclass = flowinfo & 0xff; 1402 } 1403 *mp = sbcreatecontrol((caddr_t) &tclass, sizeof(int), 1404 IPV6_TCLASS, IPPROTO_IPV6); 1405 if (*mp) 1406 mp = &(*mp)->m_next; 1407 } 1408 1409 if (v4only != NULL) { 1410 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1411 *v4only = 1; 1412 } else { 1413 *v4only = 0; 1414 } 1415 } 1416 1417 return (mp); 1418 } 1419 1420 void 1421 ip6_savecontrol(struct inpcb *in6p, struct mbuf *m, struct mbuf **mp) 1422 { 1423 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1424 int v4only = 0; 1425 1426 mp = ip6_savecontrol_v4(in6p, m, mp, &v4only); 1427 if (v4only) 1428 return; 1429 1430 /* 1431 * IPV6_HOPOPTS socket option. Recall that we required super-user 1432 * privilege for the option (see ip6_ctloutput), but it might be too 1433 * strict, since there might be some hop-by-hop options which can be 1434 * returned to normal user. 1435 * See also RFC 2292 section 6 (or RFC 3542 section 8). 1436 */ 1437 if ((in6p->inp_flags & IN6P_HOPOPTS) != 0) { 1438 /* 1439 * Check if a hop-by-hop options header is contatined in the 1440 * received packet, and if so, store the options as ancillary 1441 * data. Note that a hop-by-hop options header must be 1442 * just after the IPv6 header, which is assured through the 1443 * IPv6 input processing. 1444 */ 1445 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 1446 struct ip6_hbh *hbh; 1447 int hbhlen = 0; 1448 #ifdef PULLDOWN_TEST 1449 struct mbuf *ext; 1450 #endif 1451 1452 #ifndef PULLDOWN_TEST 1453 hbh = (struct ip6_hbh *)(ip6 + 1); 1454 hbhlen = (hbh->ip6h_len + 1) << 3; 1455 #else 1456 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr), 1457 ip6->ip6_nxt); 1458 if (ext == NULL) { 1459 V_ip6stat.ip6s_tooshort++; 1460 return; 1461 } 1462 hbh = mtod(ext, struct ip6_hbh *); 1463 hbhlen = (hbh->ip6h_len + 1) << 3; 1464 if (hbhlen != ext->m_len) { 1465 m_freem(ext); 1466 V_ip6stat.ip6s_tooshort++; 1467 return; 1468 } 1469 #endif 1470 1471 /* 1472 * XXX: We copy the whole header even if a 1473 * jumbo payload option is included, the option which 1474 * is to be removed before returning according to 1475 * RFC2292. 1476 * Note: this constraint is removed in RFC3542 1477 */ 1478 *mp = sbcreatecontrol((caddr_t)hbh, hbhlen, 1479 IS2292(in6p, IPV6_2292HOPOPTS, IPV6_HOPOPTS), 1480 IPPROTO_IPV6); 1481 if (*mp) 1482 mp = &(*mp)->m_next; 1483 #ifdef PULLDOWN_TEST 1484 m_freem(ext); 1485 #endif 1486 } 1487 } 1488 1489 if ((in6p->inp_flags & (IN6P_RTHDR | IN6P_DSTOPTS)) != 0) { 1490 int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr); 1491 1492 /* 1493 * Search for destination options headers or routing 1494 * header(s) through the header chain, and stores each 1495 * header as ancillary data. 1496 * Note that the order of the headers remains in 1497 * the chain of ancillary data. 1498 */ 1499 while (1) { /* is explicit loop prevention necessary? */ 1500 struct ip6_ext *ip6e = NULL; 1501 int elen; 1502 #ifdef PULLDOWN_TEST 1503 struct mbuf *ext = NULL; 1504 #endif 1505 1506 /* 1507 * if it is not an extension header, don't try to 1508 * pull it from the chain. 1509 */ 1510 switch (nxt) { 1511 case IPPROTO_DSTOPTS: 1512 case IPPROTO_ROUTING: 1513 case IPPROTO_HOPOPTS: 1514 case IPPROTO_AH: /* is it possible? */ 1515 break; 1516 default: 1517 goto loopend; 1518 } 1519 1520 #ifndef PULLDOWN_TEST 1521 if (off + sizeof(*ip6e) > m->m_len) 1522 goto loopend; 1523 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off); 1524 if (nxt == IPPROTO_AH) 1525 elen = (ip6e->ip6e_len + 2) << 2; 1526 else 1527 elen = (ip6e->ip6e_len + 1) << 3; 1528 if (off + elen > m->m_len) 1529 goto loopend; 1530 #else 1531 ext = ip6_pullexthdr(m, off, nxt); 1532 if (ext == NULL) { 1533 V_ip6stat.ip6s_tooshort++; 1534 return; 1535 } 1536 ip6e = mtod(ext, struct ip6_ext *); 1537 if (nxt == IPPROTO_AH) 1538 elen = (ip6e->ip6e_len + 2) << 2; 1539 else 1540 elen = (ip6e->ip6e_len + 1) << 3; 1541 if (elen != ext->m_len) { 1542 m_freem(ext); 1543 V_ip6stat.ip6s_tooshort++; 1544 return; 1545 } 1546 #endif 1547 1548 switch (nxt) { 1549 case IPPROTO_DSTOPTS: 1550 if (!(in6p->inp_flags & IN6P_DSTOPTS)) 1551 break; 1552 1553 *mp = sbcreatecontrol((caddr_t)ip6e, elen, 1554 IS2292(in6p, 1555 IPV6_2292DSTOPTS, IPV6_DSTOPTS), 1556 IPPROTO_IPV6); 1557 if (*mp) 1558 mp = &(*mp)->m_next; 1559 break; 1560 case IPPROTO_ROUTING: 1561 if (!(in6p->inp_flags & IN6P_RTHDR)) 1562 break; 1563 1564 *mp = sbcreatecontrol((caddr_t)ip6e, elen, 1565 IS2292(in6p, IPV6_2292RTHDR, IPV6_RTHDR), 1566 IPPROTO_IPV6); 1567 if (*mp) 1568 mp = &(*mp)->m_next; 1569 break; 1570 case IPPROTO_HOPOPTS: 1571 case IPPROTO_AH: /* is it possible? */ 1572 break; 1573 1574 default: 1575 /* 1576 * other cases have been filtered in the above. 1577 * none will visit this case. here we supply 1578 * the code just in case (nxt overwritten or 1579 * other cases). 1580 */ 1581 #ifdef PULLDOWN_TEST 1582 m_freem(ext); 1583 #endif 1584 goto loopend; 1585 1586 } 1587 1588 /* proceed with the next header. */ 1589 off += elen; 1590 nxt = ip6e->ip6e_nxt; 1591 ip6e = NULL; 1592 #ifdef PULLDOWN_TEST 1593 m_freem(ext); 1594 ext = NULL; 1595 #endif 1596 } 1597 loopend: 1598 ; 1599 } 1600 } 1601 #undef IS2292 1602 1603 void 1604 ip6_notify_pmtu(struct inpcb *in6p, struct sockaddr_in6 *dst, u_int32_t *mtu) 1605 { 1606 struct socket *so; 1607 struct mbuf *m_mtu; 1608 struct ip6_mtuinfo mtuctl; 1609 1610 so = in6p->inp_socket; 1611 1612 if (mtu == NULL) 1613 return; 1614 1615 #ifdef DIAGNOSTIC 1616 if (so == NULL) /* I believe this is impossible */ 1617 panic("ip6_notify_pmtu: socket is NULL"); 1618 #endif 1619 1620 bzero(&mtuctl, sizeof(mtuctl)); /* zero-clear for safety */ 1621 mtuctl.ip6m_mtu = *mtu; 1622 mtuctl.ip6m_addr = *dst; 1623 if (sa6_recoverscope(&mtuctl.ip6m_addr)) 1624 return; 1625 1626 if ((m_mtu = sbcreatecontrol((caddr_t)&mtuctl, sizeof(mtuctl), 1627 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL) 1628 return; 1629 1630 if (sbappendaddr(&so->so_rcv, (struct sockaddr *)dst, NULL, m_mtu) 1631 == 0) { 1632 m_freem(m_mtu); 1633 /* XXX: should count statistics */ 1634 } else 1635 sorwakeup(so); 1636 1637 return; 1638 } 1639 1640 #ifdef PULLDOWN_TEST 1641 /* 1642 * pull single extension header from mbuf chain. returns single mbuf that 1643 * contains the result, or NULL on error. 1644 */ 1645 static struct mbuf * 1646 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt) 1647 { 1648 struct ip6_ext ip6e; 1649 size_t elen; 1650 struct mbuf *n; 1651 1652 #ifdef DIAGNOSTIC 1653 switch (nxt) { 1654 case IPPROTO_DSTOPTS: 1655 case IPPROTO_ROUTING: 1656 case IPPROTO_HOPOPTS: 1657 case IPPROTO_AH: /* is it possible? */ 1658 break; 1659 default: 1660 printf("ip6_pullexthdr: invalid nxt=%d\n", nxt); 1661 } 1662 #endif 1663 1664 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1665 if (nxt == IPPROTO_AH) 1666 elen = (ip6e.ip6e_len + 2) << 2; 1667 else 1668 elen = (ip6e.ip6e_len + 1) << 3; 1669 1670 MGET(n, M_NOWAIT, MT_DATA); 1671 if (n && elen >= MLEN) { 1672 MCLGET(n, M_NOWAIT); 1673 if ((n->m_flags & M_EXT) == 0) { 1674 m_free(n); 1675 n = NULL; 1676 } 1677 } 1678 if (!n) 1679 return NULL; 1680 1681 n->m_len = 0; 1682 if (elen >= M_TRAILINGSPACE(n)) { 1683 m_free(n); 1684 return NULL; 1685 } 1686 1687 m_copydata(m, off, elen, mtod(n, caddr_t)); 1688 n->m_len = elen; 1689 return n; 1690 } 1691 #endif 1692 1693 /* 1694 * Get pointer to the previous header followed by the header 1695 * currently processed. 1696 * XXX: This function supposes that 1697 * M includes all headers, 1698 * the next header field and the header length field of each header 1699 * are valid, and 1700 * the sum of each header length equals to OFF. 1701 * Because of these assumptions, this function must be called very 1702 * carefully. Moreover, it will not be used in the near future when 1703 * we develop `neater' mechanism to process extension headers. 1704 */ 1705 char * 1706 ip6_get_prevhdr(struct mbuf *m, int off) 1707 { 1708 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1709 1710 if (off == sizeof(struct ip6_hdr)) 1711 return (&ip6->ip6_nxt); 1712 else { 1713 int len, nxt; 1714 struct ip6_ext *ip6e = NULL; 1715 1716 nxt = ip6->ip6_nxt; 1717 len = sizeof(struct ip6_hdr); 1718 while (len < off) { 1719 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len); 1720 1721 switch (nxt) { 1722 case IPPROTO_FRAGMENT: 1723 len += sizeof(struct ip6_frag); 1724 break; 1725 case IPPROTO_AH: 1726 len += (ip6e->ip6e_len + 2) << 2; 1727 break; 1728 default: 1729 len += (ip6e->ip6e_len + 1) << 3; 1730 break; 1731 } 1732 nxt = ip6e->ip6e_nxt; 1733 } 1734 if (ip6e) 1735 return (&ip6e->ip6e_nxt); 1736 else 1737 return NULL; 1738 } 1739 } 1740 1741 /* 1742 * get next header offset. m will be retained. 1743 */ 1744 int 1745 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp) 1746 { 1747 struct ip6_hdr ip6; 1748 struct ip6_ext ip6e; 1749 struct ip6_frag fh; 1750 1751 /* just in case */ 1752 if (m == NULL) 1753 panic("ip6_nexthdr: m == NULL"); 1754 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off) 1755 return -1; 1756 1757 switch (proto) { 1758 case IPPROTO_IPV6: 1759 if (m->m_pkthdr.len < off + sizeof(ip6)) 1760 return -1; 1761 m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6); 1762 if (nxtp) 1763 *nxtp = ip6.ip6_nxt; 1764 off += sizeof(ip6); 1765 return off; 1766 1767 case IPPROTO_FRAGMENT: 1768 /* 1769 * terminate parsing if it is not the first fragment, 1770 * it does not make sense to parse through it. 1771 */ 1772 if (m->m_pkthdr.len < off + sizeof(fh)) 1773 return -1; 1774 m_copydata(m, off, sizeof(fh), (caddr_t)&fh); 1775 /* IP6F_OFF_MASK = 0xfff8(BigEndian), 0xf8ff(LittleEndian) */ 1776 if (fh.ip6f_offlg & IP6F_OFF_MASK) 1777 return -1; 1778 if (nxtp) 1779 *nxtp = fh.ip6f_nxt; 1780 off += sizeof(struct ip6_frag); 1781 return off; 1782 1783 case IPPROTO_AH: 1784 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1785 return -1; 1786 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1787 if (nxtp) 1788 *nxtp = ip6e.ip6e_nxt; 1789 off += (ip6e.ip6e_len + 2) << 2; 1790 return off; 1791 1792 case IPPROTO_HOPOPTS: 1793 case IPPROTO_ROUTING: 1794 case IPPROTO_DSTOPTS: 1795 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1796 return -1; 1797 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1798 if (nxtp) 1799 *nxtp = ip6e.ip6e_nxt; 1800 off += (ip6e.ip6e_len + 1) << 3; 1801 return off; 1802 1803 case IPPROTO_NONE: 1804 case IPPROTO_ESP: 1805 case IPPROTO_IPCOMP: 1806 /* give up */ 1807 return -1; 1808 1809 default: 1810 return -1; 1811 } 1812 1813 return -1; 1814 } 1815 1816 /* 1817 * get offset for the last header in the chain. m will be kept untainted. 1818 */ 1819 int 1820 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp) 1821 { 1822 int newoff; 1823 int nxt; 1824 1825 if (!nxtp) { 1826 nxt = -1; 1827 nxtp = &nxt; 1828 } 1829 while (1) { 1830 newoff = ip6_nexthdr(m, off, proto, nxtp); 1831 if (newoff < 0) 1832 return off; 1833 else if (newoff < off) 1834 return -1; /* invalid */ 1835 else if (newoff == off) 1836 return newoff; 1837 1838 off = newoff; 1839 proto = *nxtp; 1840 } 1841 } 1842 1843 static struct ip6aux * 1844 ip6_addaux(struct mbuf *m) 1845 { 1846 struct m_tag *mtag; 1847 1848 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL); 1849 if (!mtag) { 1850 mtag = m_tag_get(PACKET_TAG_IPV6_INPUT, sizeof(struct ip6aux), 1851 M_NOWAIT); 1852 if (mtag) { 1853 m_tag_prepend(m, mtag); 1854 bzero(mtag + 1, sizeof(struct ip6aux)); 1855 } 1856 } 1857 return mtag ? (struct ip6aux *)(mtag + 1) : NULL; 1858 } 1859 1860 static struct ip6aux * 1861 ip6_findaux(struct mbuf *m) 1862 { 1863 struct m_tag *mtag; 1864 1865 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL); 1866 return mtag ? (struct ip6aux *)(mtag + 1) : NULL; 1867 } 1868 1869 static void 1870 ip6_delaux(struct mbuf *m) 1871 { 1872 struct m_tag *mtag; 1873 1874 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL); 1875 if (mtag) 1876 m_tag_delete(m, mtag); 1877 } 1878 1879 /* 1880 * System control for IP6 1881 */ 1882 1883 u_char inet6ctlerrmap[PRC_NCMDS] = { 1884 0, 0, 0, 0, 1885 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 1886 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 1887 EMSGSIZE, EHOSTUNREACH, 0, 0, 1888 0, 0, 0, 0, 1889 ENOPROTOOPT 1890 }; 1891