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/sdt.h> 80 #include <sys/socket.h> 81 #include <sys/socketvar.h> 82 #include <sys/errno.h> 83 #include <sys/time.h> 84 #include <sys/kernel.h> 85 #include <sys/syslog.h> 86 87 #include <net/if.h> 88 #include <net/if_var.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 int i; 311 312 if ((i = pfil_head_unregister(&V_inet6_pfil_hook)) != 0) 313 printf("%s: WARNING: unable to unregister pfil hook, " 314 "error %d\n", __func__, i); 315 hashdestroy(V_in6_ifaddrhashtbl, M_IFADDR, V_in6_ifaddrhmask); 316 nd6_destroy(); 317 callout_drain(&V_in6_tmpaddrtimer_ch); 318 } 319 #endif 320 321 static int 322 ip6_init2_vnet(const void *unused __unused) 323 { 324 325 /* nd6_timer_init */ 326 callout_init(&V_nd6_timer_ch, 0); 327 callout_reset(&V_nd6_timer_ch, hz, nd6_timer, curvnet); 328 329 /* timer for regeneranation of temporary addresses randomize ID */ 330 callout_init(&V_in6_tmpaddrtimer_ch, 0); 331 callout_reset(&V_in6_tmpaddrtimer_ch, 332 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor - 333 V_ip6_temp_regen_advance) * hz, 334 in6_tmpaddrtimer, curvnet); 335 336 return (0); 337 } 338 339 static void 340 ip6_init2(void *dummy) 341 { 342 343 ip6_init2_vnet(NULL); 344 } 345 346 /* cheat */ 347 /* This must be after route_init(), which is now SI_ORDER_THIRD */ 348 SYSINIT(netinet6init2, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ip6_init2, NULL); 349 350 static int 351 ip6_input_hbh(struct mbuf *m, uint32_t *plen, uint32_t *rtalert, int *off, 352 int *nxt, int *ours) 353 { 354 struct ip6_hdr *ip6; 355 struct ip6_hbh *hbh; 356 357 if (ip6_hopopts_input(plen, rtalert, &m, off)) { 358 #if 0 /*touches NULL pointer*/ 359 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 360 #endif 361 goto out; /* m have already been freed */ 362 } 363 364 /* adjust pointer */ 365 ip6 = mtod(m, struct ip6_hdr *); 366 367 /* 368 * if the payload length field is 0 and the next header field 369 * indicates Hop-by-Hop Options header, then a Jumbo Payload 370 * option MUST be included. 371 */ 372 if (ip6->ip6_plen == 0 && *plen == 0) { 373 /* 374 * Note that if a valid jumbo payload option is 375 * contained, ip6_hopopts_input() must set a valid 376 * (non-zero) payload length to the variable plen. 377 */ 378 IP6STAT_INC(ip6s_badoptions); 379 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 380 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 381 icmp6_error(m, ICMP6_PARAM_PROB, 382 ICMP6_PARAMPROB_HEADER, 383 (caddr_t)&ip6->ip6_plen - (caddr_t)ip6); 384 goto out; 385 } 386 #ifndef PULLDOWN_TEST 387 /* ip6_hopopts_input() ensures that mbuf is contiguous */ 388 hbh = (struct ip6_hbh *)(ip6 + 1); 389 #else 390 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 391 sizeof(struct ip6_hbh)); 392 if (hbh == NULL) { 393 IP6STAT_INC(ip6s_tooshort); 394 goto out; 395 } 396 #endif 397 *nxt = hbh->ip6h_nxt; 398 399 /* 400 * If we are acting as a router and the packet contains a 401 * router alert option, see if we know the option value. 402 * Currently, we only support the option value for MLD, in which 403 * case we should pass the packet to the multicast routing 404 * daemon. 405 */ 406 if (*rtalert != ~0) { 407 switch (*rtalert) { 408 case IP6OPT_RTALERT_MLD: 409 if (V_ip6_forwarding) 410 *ours = 1; 411 break; 412 default: 413 /* 414 * RFC2711 requires unrecognized values must be 415 * silently ignored. 416 */ 417 break; 418 } 419 } 420 421 return (0); 422 423 out: 424 return (1); 425 } 426 427 void 428 ip6_input(struct mbuf *m) 429 { 430 struct ip6_hdr *ip6; 431 int off = sizeof(struct ip6_hdr), nest; 432 u_int32_t plen; 433 u_int32_t rtalert = ~0; 434 int nxt, ours = 0; 435 struct ifnet *deliverifp = NULL, *ifp = NULL; 436 struct in6_addr odst; 437 struct route_in6 rin6; 438 int srcrt = 0; 439 struct llentry *lle = NULL; 440 struct sockaddr_in6 dst6, *dst; 441 442 bzero(&rin6, sizeof(struct route_in6)); 443 #ifdef IPSEC 444 /* 445 * should the inner packet be considered authentic? 446 * see comment in ah4_input(). 447 * NB: m cannot be NULL when passed to the input routine 448 */ 449 450 m->m_flags &= ~M_AUTHIPHDR; 451 m->m_flags &= ~M_AUTHIPDGM; 452 453 #endif /* IPSEC */ 454 455 /* 456 * make sure we don't have onion peering information into m_tag. 457 */ 458 ip6_delaux(m); 459 460 if (m->m_flags & M_FASTFWD_OURS) { 461 /* 462 * Firewall changed destination to local. 463 */ 464 m->m_flags &= ~M_FASTFWD_OURS; 465 ours = 1; 466 deliverifp = m->m_pkthdr.rcvif; 467 ip6 = mtod(m, struct ip6_hdr *); 468 goto hbhcheck; 469 } 470 471 /* 472 * mbuf statistics 473 */ 474 if (m->m_flags & M_EXT) { 475 if (m->m_next) 476 IP6STAT_INC(ip6s_mext2m); 477 else 478 IP6STAT_INC(ip6s_mext1); 479 } else { 480 if (m->m_next) { 481 if (m->m_flags & M_LOOP) { 482 IP6STAT_INC(ip6s_m2m[V_loif->if_index]); 483 } else if (m->m_pkthdr.rcvif->if_index < IP6S_M2MMAX) 484 IP6STAT_INC( 485 ip6s_m2m[m->m_pkthdr.rcvif->if_index]); 486 else 487 IP6STAT_INC(ip6s_m2m[0]); 488 } else 489 IP6STAT_INC(ip6s_m1); 490 } 491 492 /* drop the packet if IPv6 operation is disabled on the IF */ 493 if ((ND_IFINFO(m->m_pkthdr.rcvif)->flags & ND6_IFF_IFDISABLED)) { 494 m_freem(m); 495 return; 496 } 497 498 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive); 499 IP6STAT_INC(ip6s_total); 500 501 #ifndef PULLDOWN_TEST 502 /* 503 * L2 bridge code and some other code can return mbuf chain 504 * that does not conform to KAME requirement. too bad. 505 * XXX: fails to join if interface MTU > MCLBYTES. jumbogram? 506 */ 507 if (m && m->m_next != NULL && m->m_pkthdr.len < MCLBYTES) { 508 struct mbuf *n; 509 510 if (m->m_pkthdr.len > MHLEN) 511 n = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 512 else 513 n = m_gethdr(M_NOWAIT, MT_DATA); 514 if (n == NULL) { 515 m_freem(m); 516 return; /* ENOBUFS */ 517 } 518 519 m_move_pkthdr(n, m); 520 m_copydata(m, 0, n->m_pkthdr.len, mtod(n, caddr_t)); 521 n->m_len = n->m_pkthdr.len; 522 m_freem(m); 523 m = n; 524 } 525 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), /* nothing */); 526 #endif 527 528 if (m->m_len < sizeof(struct ip6_hdr)) { 529 struct ifnet *inifp; 530 inifp = m->m_pkthdr.rcvif; 531 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 532 IP6STAT_INC(ip6s_toosmall); 533 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 534 return; 535 } 536 } 537 538 ip6 = mtod(m, struct ip6_hdr *); 539 540 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 541 IP6STAT_INC(ip6s_badvers); 542 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 543 goto bad; 544 } 545 546 IP6STAT_INC(ip6s_nxthist[ip6->ip6_nxt]); 547 548 IP_PROBE(receive, NULL, NULL, ip6, m->m_pkthdr.rcvif, NULL, ip6); 549 550 /* 551 * Check against address spoofing/corruption. 552 */ 553 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) || 554 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) { 555 /* 556 * XXX: "badscope" is not very suitable for a multicast source. 557 */ 558 IP6STAT_INC(ip6s_badscope); 559 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 560 goto bad; 561 } 562 if (IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) && 563 !(m->m_flags & M_LOOP)) { 564 /* 565 * In this case, the packet should come from the loopback 566 * interface. However, we cannot just check the if_flags, 567 * because ip6_mloopback() passes the "actual" interface 568 * as the outgoing/incoming interface. 569 */ 570 IP6STAT_INC(ip6s_badscope); 571 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 572 goto bad; 573 } 574 575 #ifdef ALTQ 576 if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) { 577 /* packet is dropped by traffic conditioner */ 578 return; 579 } 580 #endif 581 /* 582 * The following check is not documented in specs. A malicious 583 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack 584 * and bypass security checks (act as if it was from 127.0.0.1 by using 585 * IPv6 src ::ffff:127.0.0.1). Be cautious. 586 * 587 * This check chokes if we are in an SIIT cloud. As none of BSDs 588 * support IPv4-less kernel compilation, we cannot support SIIT 589 * environment at all. So, it makes more sense for us to reject any 590 * malicious packets for non-SIIT environment, than try to do a 591 * partial support for SIIT environment. 592 */ 593 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 594 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 595 IP6STAT_INC(ip6s_badscope); 596 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 597 goto bad; 598 } 599 #if 0 600 /* 601 * Reject packets with IPv4 compatible addresses (auto tunnel). 602 * 603 * The code forbids auto tunnel relay case in RFC1933 (the check is 604 * stronger than RFC1933). We may want to re-enable it if mech-xx 605 * is revised to forbid relaying case. 606 */ 607 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) || 608 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) { 609 IP6STAT_INC(ip6s_badscope); 610 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 611 goto bad; 612 } 613 #endif 614 #ifdef IPSEC 615 /* 616 * Bypass packet filtering for packets previously handled by IPsec. 617 */ 618 if (ip6_ipsec_filtertunnel(m)) 619 goto passin; 620 #endif /* IPSEC */ 621 622 /* 623 * Run through list of hooks for input packets. 624 * 625 * NB: Beware of the destination address changing 626 * (e.g. by NAT rewriting). When this happens, 627 * tell ip6_forward to do the right thing. 628 */ 629 odst = ip6->ip6_dst; 630 631 /* Jump over all PFIL processing if hooks are not active. */ 632 if (!PFIL_HOOKED(&V_inet6_pfil_hook)) 633 goto passin; 634 635 if (pfil_run_hooks(&V_inet6_pfil_hook, &m, 636 m->m_pkthdr.rcvif, PFIL_IN, NULL)) 637 return; 638 if (m == NULL) /* consumed by filter */ 639 return; 640 ip6 = mtod(m, struct ip6_hdr *); 641 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst); 642 643 if (m->m_flags & M_FASTFWD_OURS) { 644 m->m_flags &= ~M_FASTFWD_OURS; 645 ours = 1; 646 deliverifp = m->m_pkthdr.rcvif; 647 goto hbhcheck; 648 } 649 if ((m->m_flags & M_IP6_NEXTHOP) && 650 m_tag_find(m, PACKET_TAG_IPFORWARD, NULL) != NULL) { 651 /* 652 * Directly ship the packet on. This allows forwarding 653 * packets originally destined to us to some other directly 654 * connected host. 655 */ 656 ip6_forward(m, 1); 657 goto out; 658 } 659 660 passin: 661 /* 662 * Disambiguate address scope zones (if there is ambiguity). 663 * We first make sure that the original source or destination address 664 * is not in our internal form for scoped addresses. Such addresses 665 * are not necessarily invalid spec-wise, but we cannot accept them due 666 * to the usage conflict. 667 * in6_setscope() then also checks and rejects the cases where src or 668 * dst are the loopback address and the receiving interface 669 * is not loopback. 670 */ 671 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) { 672 IP6STAT_INC(ip6s_badscope); /* XXX */ 673 goto bad; 674 } 675 if (in6_setscope(&ip6->ip6_src, m->m_pkthdr.rcvif, NULL) || 676 in6_setscope(&ip6->ip6_dst, m->m_pkthdr.rcvif, NULL)) { 677 IP6STAT_INC(ip6s_badscope); 678 goto bad; 679 } 680 681 /* 682 * Multicast check. Assume packet is for us to avoid 683 * prematurely taking locks. 684 */ 685 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 686 ours = 1; 687 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast); 688 deliverifp = m->m_pkthdr.rcvif; 689 goto hbhcheck; 690 } 691 692 /* 693 * Unicast check 694 */ 695 696 bzero(&dst6, sizeof(dst6)); 697 dst6.sin6_family = AF_INET6; 698 dst6.sin6_len = sizeof(struct sockaddr_in6); 699 dst6.sin6_addr = ip6->ip6_dst; 700 ifp = m->m_pkthdr.rcvif; 701 IF_AFDATA_RLOCK(ifp); 702 lle = lla_lookup(LLTABLE6(ifp), 0, 703 (struct sockaddr *)&dst6); 704 IF_AFDATA_RUNLOCK(ifp); 705 if ((lle != NULL) && (lle->la_flags & LLE_IFADDR)) { 706 struct ifaddr *ifa; 707 struct in6_ifaddr *ia6; 708 int bad; 709 710 bad = 1; 711 #define sa_equal(a1, a2) \ 712 (bcmp((a1), (a2), ((a1))->sin6_len) == 0) 713 IF_ADDR_RLOCK(ifp); 714 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 715 if (ifa->ifa_addr->sa_family != dst6.sin6_family) 716 continue; 717 if (sa_equal(&dst6, ifa->ifa_addr)) 718 break; 719 } 720 KASSERT(ifa != NULL, ("%s: ifa not found for lle %p", 721 __func__, lle)); 722 #undef sa_equal 723 724 ia6 = (struct in6_ifaddr *)ifa; 725 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) { 726 /* Count the packet in the ip address stats */ 727 counter_u64_add(ia6->ia_ifa.ifa_ipackets, 1); 728 counter_u64_add(ia6->ia_ifa.ifa_ibytes, 729 m->m_pkthdr.len); 730 731 /* 732 * record address information into m_tag. 733 */ 734 (void)ip6_setdstifaddr(m, ia6); 735 736 bad = 0; 737 } else { 738 char ip6bufs[INET6_ADDRSTRLEN]; 739 char ip6bufd[INET6_ADDRSTRLEN]; 740 /* address is not ready, so discard the packet. */ 741 nd6log((LOG_INFO, 742 "ip6_input: packet to an unready address %s->%s\n", 743 ip6_sprintf(ip6bufs, &ip6->ip6_src), 744 ip6_sprintf(ip6bufd, &ip6->ip6_dst))); 745 } 746 IF_ADDR_RUNLOCK(ifp); 747 LLE_RUNLOCK(lle); 748 if (bad) 749 goto bad; 750 else { 751 ours = 1; 752 deliverifp = ifp; 753 goto hbhcheck; 754 } 755 } 756 if (lle != NULL) 757 LLE_RUNLOCK(lle); 758 759 dst = &rin6.ro_dst; 760 dst->sin6_len = sizeof(struct sockaddr_in6); 761 dst->sin6_family = AF_INET6; 762 dst->sin6_addr = ip6->ip6_dst; 763 rin6.ro_rt = in6_rtalloc1((struct sockaddr *)dst, 0, 0, M_GETFIB(m)); 764 if (rin6.ro_rt) 765 RT_UNLOCK(rin6.ro_rt); 766 767 #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key)) 768 769 /* 770 * Accept the packet if the forwarding interface to the destination 771 * according to the routing table is the loopback interface, 772 * unless the associated route has a gateway. 773 * Note that this approach causes to accept a packet if there is a 774 * route to the loopback interface for the destination of the packet. 775 * But we think it's even useful in some situations, e.g. when using 776 * a special daemon which wants to intercept the packet. 777 * 778 * XXX: some OSes automatically make a cloned route for the destination 779 * of an outgoing packet. If the outgoing interface of the packet 780 * is a loopback one, the kernel would consider the packet to be 781 * accepted, even if we have no such address assinged on the interface. 782 * We check the cloned flag of the route entry to reject such cases, 783 * assuming that route entries for our own addresses are not made by 784 * cloning (it should be true because in6_addloop explicitly installs 785 * the host route). However, we might have to do an explicit check 786 * while it would be less efficient. Or, should we rather install a 787 * reject route for such a case? 788 */ 789 if (rin6.ro_rt && 790 (rin6.ro_rt->rt_flags & 791 (RTF_HOST|RTF_GATEWAY)) == RTF_HOST && 792 #ifdef RTF_WASCLONED 793 !(rin6.ro_rt->rt_flags & RTF_WASCLONED) && 794 #endif 795 #ifdef RTF_CLONED 796 !(rin6.ro_rt->rt_flags & RTF_CLONED) && 797 #endif 798 #if 0 799 /* 800 * The check below is redundant since the comparison of 801 * the destination and the key of the rtentry has 802 * already done through looking up the routing table. 803 */ 804 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 805 &rt6_key(rin6.ro_rt)->sin6_addr) 806 #endif 807 rin6.ro_rt->rt_ifp->if_type == IFT_LOOP) { 808 int free_ia6 = 0; 809 struct in6_ifaddr *ia6; 810 811 /* 812 * found the loopback route to the interface address 813 */ 814 if (rin6.ro_rt->rt_gateway->sa_family == AF_LINK) { 815 struct sockaddr_in6 dest6; 816 817 bzero(&dest6, sizeof(dest6)); 818 dest6.sin6_family = AF_INET6; 819 dest6.sin6_len = sizeof(dest6); 820 dest6.sin6_addr = ip6->ip6_dst; 821 ia6 = (struct in6_ifaddr *) 822 ifa_ifwithaddr((struct sockaddr *)&dest6); 823 if (ia6 == NULL) 824 goto bad; 825 free_ia6 = 1; 826 } 827 else 828 ia6 = (struct in6_ifaddr *)rin6.ro_rt->rt_ifa; 829 830 /* 831 * record address information into m_tag. 832 */ 833 (void)ip6_setdstifaddr(m, ia6); 834 835 /* 836 * packets to a tentative, duplicated, or somehow invalid 837 * address must not be accepted. 838 */ 839 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) { 840 /* this address is ready */ 841 ours = 1; 842 deliverifp = ia6->ia_ifp; /* correct? */ 843 /* Count the packet in the ip address stats */ 844 counter_u64_add(ia6->ia_ifa.ifa_ipackets, 1); 845 counter_u64_add(ia6->ia_ifa.ifa_ibytes, 846 m->m_pkthdr.len); 847 if (free_ia6) 848 ifa_free(&ia6->ia_ifa); 849 goto hbhcheck; 850 } else { 851 char ip6bufs[INET6_ADDRSTRLEN]; 852 char ip6bufd[INET6_ADDRSTRLEN]; 853 /* address is not ready, so discard the packet. */ 854 nd6log((LOG_INFO, 855 "ip6_input: packet to an unready address %s->%s\n", 856 ip6_sprintf(ip6bufs, &ip6->ip6_src), 857 ip6_sprintf(ip6bufd, &ip6->ip6_dst))); 858 859 if (free_ia6) 860 ifa_free(&ia6->ia_ifa); 861 goto bad; 862 } 863 } 864 865 /* 866 * FAITH (Firewall Aided Internet Translator) 867 */ 868 if (V_ip6_keepfaith) { 869 if (rin6.ro_rt && rin6.ro_rt->rt_ifp && 870 rin6.ro_rt->rt_ifp->if_type == IFT_FAITH) { 871 /* XXX do we need more sanity checks? */ 872 ours = 1; 873 deliverifp = rin6.ro_rt->rt_ifp; /* faith */ 874 goto hbhcheck; 875 } 876 } 877 878 /* 879 * Now there is no reason to process the packet if it's not our own 880 * and we're not a router. 881 */ 882 if (!V_ip6_forwarding) { 883 IP6STAT_INC(ip6s_cantforward); 884 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 885 goto bad; 886 } 887 888 hbhcheck: 889 /* 890 * record address information into m_tag, if we don't have one yet. 891 * note that we are unable to record it, if the address is not listed 892 * as our interface address (e.g. multicast addresses, addresses 893 * within FAITH prefixes and such). 894 */ 895 if (deliverifp) { 896 struct in6_ifaddr *ia6; 897 898 if ((ia6 = ip6_getdstifaddr(m)) != NULL) { 899 ifa_free(&ia6->ia_ifa); 900 } else { 901 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 902 if (ia6) { 903 if (!ip6_setdstifaddr(m, ia6)) { 904 /* 905 * XXX maybe we should drop the packet here, 906 * as we could not provide enough information 907 * to the upper layers. 908 */ 909 } 910 ifa_free(&ia6->ia_ifa); 911 } 912 } 913 } 914 915 /* 916 * Process Hop-by-Hop options header if it's contained. 917 * m may be modified in ip6_hopopts_input(). 918 * If a JumboPayload option is included, plen will also be modified. 919 */ 920 plen = (u_int32_t)ntohs(ip6->ip6_plen); 921 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 922 int error; 923 924 error = ip6_input_hbh(m, &plen, &rtalert, &off, &nxt, &ours); 925 if (error != 0) 926 goto out; 927 } else 928 nxt = ip6->ip6_nxt; 929 930 /* 931 * Check that the amount of data in the buffers 932 * is as at least much as the IPv6 header would have us expect. 933 * Trim mbufs if longer than we expect. 934 * Drop packet if shorter than we expect. 935 */ 936 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 937 IP6STAT_INC(ip6s_tooshort); 938 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 939 goto bad; 940 } 941 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 942 if (m->m_len == m->m_pkthdr.len) { 943 m->m_len = sizeof(struct ip6_hdr) + plen; 944 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 945 } else 946 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 947 } 948 949 /* 950 * Forward if desirable. 951 */ 952 if (V_ip6_mrouter && 953 IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 954 /* 955 * If we are acting as a multicast router, all 956 * incoming multicast packets are passed to the 957 * kernel-level multicast forwarding function. 958 * The packet is returned (relatively) intact; if 959 * ip6_mforward() returns a non-zero value, the packet 960 * must be discarded, else it may be accepted below. 961 * 962 * XXX TODO: Check hlim and multicast scope here to avoid 963 * unnecessarily calling into ip6_mforward(). 964 */ 965 if (ip6_mforward && 966 ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) { 967 IP6STAT_INC(ip6s_cantforward); 968 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 969 goto bad; 970 } 971 } else if (!ours) { 972 ip6_forward(m, srcrt); 973 goto out; 974 } 975 976 ip6 = mtod(m, struct ip6_hdr *); 977 978 /* 979 * Malicious party may be able to use IPv4 mapped addr to confuse 980 * tcp/udp stack and bypass security checks (act as if it was from 981 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious. 982 * 983 * For SIIT end node behavior, you may want to disable the check. 984 * However, you will become vulnerable to attacks using IPv4 mapped 985 * source. 986 */ 987 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 988 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 989 IP6STAT_INC(ip6s_badscope); 990 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 991 goto bad; 992 } 993 994 /* 995 * Tell launch routine the next header 996 */ 997 IP6STAT_INC(ip6s_delivered); 998 in6_ifstat_inc(deliverifp, ifs6_in_deliver); 999 nest = 0; 1000 1001 while (nxt != IPPROTO_DONE) { 1002 if (V_ip6_hdrnestlimit && (++nest > V_ip6_hdrnestlimit)) { 1003 IP6STAT_INC(ip6s_toomanyhdr); 1004 goto bad; 1005 } 1006 1007 /* 1008 * protection against faulty packet - there should be 1009 * more sanity checks in header chain processing. 1010 */ 1011 if (m->m_pkthdr.len < off) { 1012 IP6STAT_INC(ip6s_tooshort); 1013 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 1014 goto bad; 1015 } 1016 1017 #ifdef IPSEC 1018 /* 1019 * enforce IPsec policy checking if we are seeing last header. 1020 * note that we do not visit this with protocols with pcb layer 1021 * code - like udp/tcp/raw ip. 1022 */ 1023 if (ip6_ipsec_input(m, nxt)) 1024 goto bad; 1025 #endif /* IPSEC */ 1026 1027 /* 1028 * Use mbuf flags to propagate Router Alert option to 1029 * ICMPv6 layer, as hop-by-hop options have been stripped. 1030 */ 1031 if (nxt == IPPROTO_ICMPV6 && rtalert != ~0) 1032 m->m_flags |= M_RTALERT_MLD; 1033 1034 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt); 1035 } 1036 goto out; 1037 bad: 1038 m_freem(m); 1039 out: 1040 if (rin6.ro_rt) 1041 RTFREE(rin6.ro_rt); 1042 } 1043 1044 /* 1045 * set/grab in6_ifaddr correspond to IPv6 destination address. 1046 * XXX backward compatibility wrapper 1047 * 1048 * XXXRW: We should bump the refcount on ia6 before sticking it in the m_tag, 1049 * and then bump it when the tag is copied, and release it when the tag is 1050 * freed. Unfortunately, m_tags don't support deep copies (yet), so instead 1051 * we just bump the ia refcount when we receive it. This should be fixed. 1052 */ 1053 static struct ip6aux * 1054 ip6_setdstifaddr(struct mbuf *m, struct in6_ifaddr *ia6) 1055 { 1056 struct ip6aux *ip6a; 1057 1058 ip6a = ip6_addaux(m); 1059 if (ip6a) 1060 ip6a->ip6a_dstia6 = ia6; 1061 return ip6a; /* NULL if failed to set */ 1062 } 1063 1064 struct in6_ifaddr * 1065 ip6_getdstifaddr(struct mbuf *m) 1066 { 1067 struct ip6aux *ip6a; 1068 struct in6_ifaddr *ia; 1069 1070 ip6a = ip6_findaux(m); 1071 if (ip6a) { 1072 ia = ip6a->ip6a_dstia6; 1073 ifa_ref(&ia->ia_ifa); 1074 return ia; 1075 } else 1076 return NULL; 1077 } 1078 1079 /* 1080 * Hop-by-Hop options header processing. If a valid jumbo payload option is 1081 * included, the real payload length will be stored in plenp. 1082 * 1083 * rtalertp - XXX: should be stored more smart way 1084 */ 1085 static int 1086 ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp, 1087 struct mbuf **mp, int *offp) 1088 { 1089 struct mbuf *m = *mp; 1090 int off = *offp, hbhlen; 1091 struct ip6_hbh *hbh; 1092 u_int8_t *opt; 1093 1094 /* validation of the length of the header */ 1095 #ifndef PULLDOWN_TEST 1096 IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1); 1097 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); 1098 hbhlen = (hbh->ip6h_len + 1) << 3; 1099 1100 IP6_EXTHDR_CHECK(m, off, hbhlen, -1); 1101 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); 1102 #else 1103 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, 1104 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh)); 1105 if (hbh == NULL) { 1106 IP6STAT_INC(ip6s_tooshort); 1107 return -1; 1108 } 1109 hbhlen = (hbh->ip6h_len + 1) << 3; 1110 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 1111 hbhlen); 1112 if (hbh == NULL) { 1113 IP6STAT_INC(ip6s_tooshort); 1114 return -1; 1115 } 1116 #endif 1117 off += hbhlen; 1118 hbhlen -= sizeof(struct ip6_hbh); 1119 opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh); 1120 1121 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 1122 hbhlen, rtalertp, plenp) < 0) 1123 return (-1); 1124 1125 *offp = off; 1126 *mp = m; 1127 return (0); 1128 } 1129 1130 /* 1131 * Search header for all Hop-by-hop options and process each option. 1132 * This function is separate from ip6_hopopts_input() in order to 1133 * handle a case where the sending node itself process its hop-by-hop 1134 * options header. In such a case, the function is called from ip6_output(). 1135 * 1136 * The function assumes that hbh header is located right after the IPv6 header 1137 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to 1138 * opthead + hbhlen is located in contiguous memory region. 1139 */ 1140 int 1141 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen, 1142 u_int32_t *rtalertp, u_int32_t *plenp) 1143 { 1144 struct ip6_hdr *ip6; 1145 int optlen = 0; 1146 u_int8_t *opt = opthead; 1147 u_int16_t rtalert_val; 1148 u_int32_t jumboplen; 1149 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh); 1150 1151 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 1152 switch (*opt) { 1153 case IP6OPT_PAD1: 1154 optlen = 1; 1155 break; 1156 case IP6OPT_PADN: 1157 if (hbhlen < IP6OPT_MINLEN) { 1158 IP6STAT_INC(ip6s_toosmall); 1159 goto bad; 1160 } 1161 optlen = *(opt + 1) + 2; 1162 break; 1163 case IP6OPT_ROUTER_ALERT: 1164 /* XXX may need check for alignment */ 1165 if (hbhlen < IP6OPT_RTALERT_LEN) { 1166 IP6STAT_INC(ip6s_toosmall); 1167 goto bad; 1168 } 1169 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) { 1170 /* XXX stat */ 1171 icmp6_error(m, ICMP6_PARAM_PROB, 1172 ICMP6_PARAMPROB_HEADER, 1173 erroff + opt + 1 - opthead); 1174 return (-1); 1175 } 1176 optlen = IP6OPT_RTALERT_LEN; 1177 bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2); 1178 *rtalertp = ntohs(rtalert_val); 1179 break; 1180 case IP6OPT_JUMBO: 1181 /* XXX may need check for alignment */ 1182 if (hbhlen < IP6OPT_JUMBO_LEN) { 1183 IP6STAT_INC(ip6s_toosmall); 1184 goto bad; 1185 } 1186 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) { 1187 /* XXX stat */ 1188 icmp6_error(m, ICMP6_PARAM_PROB, 1189 ICMP6_PARAMPROB_HEADER, 1190 erroff + opt + 1 - opthead); 1191 return (-1); 1192 } 1193 optlen = IP6OPT_JUMBO_LEN; 1194 1195 /* 1196 * IPv6 packets that have non 0 payload length 1197 * must not contain a jumbo payload option. 1198 */ 1199 ip6 = mtod(m, struct ip6_hdr *); 1200 if (ip6->ip6_plen) { 1201 IP6STAT_INC(ip6s_badoptions); 1202 icmp6_error(m, ICMP6_PARAM_PROB, 1203 ICMP6_PARAMPROB_HEADER, 1204 erroff + opt - opthead); 1205 return (-1); 1206 } 1207 1208 /* 1209 * We may see jumbolen in unaligned location, so 1210 * we'd need to perform bcopy(). 1211 */ 1212 bcopy(opt + 2, &jumboplen, sizeof(jumboplen)); 1213 jumboplen = (u_int32_t)htonl(jumboplen); 1214 1215 #if 1 1216 /* 1217 * if there are multiple jumbo payload options, 1218 * *plenp will be non-zero and the packet will be 1219 * rejected. 1220 * the behavior may need some debate in ipngwg - 1221 * multiple options does not make sense, however, 1222 * there's no explicit mention in specification. 1223 */ 1224 if (*plenp != 0) { 1225 IP6STAT_INC(ip6s_badoptions); 1226 icmp6_error(m, ICMP6_PARAM_PROB, 1227 ICMP6_PARAMPROB_HEADER, 1228 erroff + opt + 2 - opthead); 1229 return (-1); 1230 } 1231 #endif 1232 1233 /* 1234 * jumbo payload length must be larger than 65535. 1235 */ 1236 if (jumboplen <= IPV6_MAXPACKET) { 1237 IP6STAT_INC(ip6s_badoptions); 1238 icmp6_error(m, ICMP6_PARAM_PROB, 1239 ICMP6_PARAMPROB_HEADER, 1240 erroff + opt + 2 - opthead); 1241 return (-1); 1242 } 1243 *plenp = jumboplen; 1244 1245 break; 1246 default: /* unknown option */ 1247 if (hbhlen < IP6OPT_MINLEN) { 1248 IP6STAT_INC(ip6s_toosmall); 1249 goto bad; 1250 } 1251 optlen = ip6_unknown_opt(opt, m, 1252 erroff + opt - opthead); 1253 if (optlen == -1) 1254 return (-1); 1255 optlen += 2; 1256 break; 1257 } 1258 } 1259 1260 return (0); 1261 1262 bad: 1263 m_freem(m); 1264 return (-1); 1265 } 1266 1267 /* 1268 * Unknown option processing. 1269 * The third argument `off' is the offset from the IPv6 header to the option, 1270 * which is necessary if the IPv6 header the and option header and IPv6 header 1271 * is not contiguous in order to return an ICMPv6 error. 1272 */ 1273 int 1274 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off) 1275 { 1276 struct ip6_hdr *ip6; 1277 1278 switch (IP6OPT_TYPE(*optp)) { 1279 case IP6OPT_TYPE_SKIP: /* ignore the option */ 1280 return ((int)*(optp + 1)); 1281 case IP6OPT_TYPE_DISCARD: /* silently discard */ 1282 m_freem(m); 1283 return (-1); 1284 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 1285 IP6STAT_INC(ip6s_badoptions); 1286 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 1287 return (-1); 1288 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 1289 IP6STAT_INC(ip6s_badoptions); 1290 ip6 = mtod(m, struct ip6_hdr *); 1291 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 1292 (m->m_flags & (M_BCAST|M_MCAST))) 1293 m_freem(m); 1294 else 1295 icmp6_error(m, ICMP6_PARAM_PROB, 1296 ICMP6_PARAMPROB_OPTION, off); 1297 return (-1); 1298 } 1299 1300 m_freem(m); /* XXX: NOTREACHED */ 1301 return (-1); 1302 } 1303 1304 /* 1305 * Create the "control" list for this pcb. 1306 * These functions will not modify mbuf chain at all. 1307 * 1308 * With KAME mbuf chain restriction: 1309 * The routine will be called from upper layer handlers like tcp6_input(). 1310 * Thus the routine assumes that the caller (tcp6_input) have already 1311 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the 1312 * very first mbuf on the mbuf chain. 1313 * 1314 * ip6_savecontrol_v4 will handle those options that are possible to be 1315 * set on a v4-mapped socket. 1316 * ip6_savecontrol will directly call ip6_savecontrol_v4 to handle those 1317 * options and handle the v6-only ones itself. 1318 */ 1319 struct mbuf ** 1320 ip6_savecontrol_v4(struct inpcb *inp, struct mbuf *m, struct mbuf **mp, 1321 int *v4only) 1322 { 1323 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1324 1325 #ifdef SO_TIMESTAMP 1326 if ((inp->inp_socket->so_options & SO_TIMESTAMP) != 0) { 1327 struct timeval tv; 1328 1329 microtime(&tv); 1330 *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv), 1331 SCM_TIMESTAMP, SOL_SOCKET); 1332 if (*mp) 1333 mp = &(*mp)->m_next; 1334 } 1335 #endif 1336 1337 #define IS2292(inp, x, y) (((inp)->inp_flags & IN6P_RFC2292) ? (x) : (y)) 1338 /* RFC 2292 sec. 5 */ 1339 if ((inp->inp_flags & IN6P_PKTINFO) != 0) { 1340 struct in6_pktinfo pi6; 1341 1342 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1343 #ifdef INET 1344 struct ip *ip; 1345 1346 ip = mtod(m, struct ip *); 1347 pi6.ipi6_addr.s6_addr32[0] = 0; 1348 pi6.ipi6_addr.s6_addr32[1] = 0; 1349 pi6.ipi6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP; 1350 pi6.ipi6_addr.s6_addr32[3] = ip->ip_dst.s_addr; 1351 #else 1352 /* We won't hit this code */ 1353 bzero(&pi6.ipi6_addr, sizeof(struct in6_addr)); 1354 #endif 1355 } else { 1356 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr)); 1357 in6_clearscope(&pi6.ipi6_addr); /* XXX */ 1358 } 1359 pi6.ipi6_ifindex = 1360 (m && m->m_pkthdr.rcvif) ? m->m_pkthdr.rcvif->if_index : 0; 1361 1362 *mp = sbcreatecontrol((caddr_t) &pi6, 1363 sizeof(struct in6_pktinfo), 1364 IS2292(inp, IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6); 1365 if (*mp) 1366 mp = &(*mp)->m_next; 1367 } 1368 1369 if ((inp->inp_flags & IN6P_HOPLIMIT) != 0) { 1370 int hlim; 1371 1372 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1373 #ifdef INET 1374 struct ip *ip; 1375 1376 ip = mtod(m, struct ip *); 1377 hlim = ip->ip_ttl; 1378 #else 1379 /* We won't hit this code */ 1380 hlim = 0; 1381 #endif 1382 } else { 1383 hlim = ip6->ip6_hlim & 0xff; 1384 } 1385 *mp = sbcreatecontrol((caddr_t) &hlim, sizeof(int), 1386 IS2292(inp, IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), 1387 IPPROTO_IPV6); 1388 if (*mp) 1389 mp = &(*mp)->m_next; 1390 } 1391 1392 if ((inp->inp_flags & IN6P_TCLASS) != 0) { 1393 int tclass; 1394 1395 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1396 #ifdef INET 1397 struct ip *ip; 1398 1399 ip = mtod(m, struct ip *); 1400 tclass = ip->ip_tos; 1401 #else 1402 /* We won't hit this code */ 1403 tclass = 0; 1404 #endif 1405 } else { 1406 u_int32_t flowinfo; 1407 1408 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK); 1409 flowinfo >>= 20; 1410 tclass = flowinfo & 0xff; 1411 } 1412 *mp = sbcreatecontrol((caddr_t) &tclass, sizeof(int), 1413 IPV6_TCLASS, IPPROTO_IPV6); 1414 if (*mp) 1415 mp = &(*mp)->m_next; 1416 } 1417 1418 if (v4only != NULL) { 1419 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1420 *v4only = 1; 1421 } else { 1422 *v4only = 0; 1423 } 1424 } 1425 1426 return (mp); 1427 } 1428 1429 void 1430 ip6_savecontrol(struct inpcb *in6p, struct mbuf *m, struct mbuf **mp) 1431 { 1432 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1433 int v4only = 0; 1434 1435 mp = ip6_savecontrol_v4(in6p, m, mp, &v4only); 1436 if (v4only) 1437 return; 1438 1439 /* 1440 * IPV6_HOPOPTS socket option. Recall that we required super-user 1441 * privilege for the option (see ip6_ctloutput), but it might be too 1442 * strict, since there might be some hop-by-hop options which can be 1443 * returned to normal user. 1444 * See also RFC 2292 section 6 (or RFC 3542 section 8). 1445 */ 1446 if ((in6p->inp_flags & IN6P_HOPOPTS) != 0) { 1447 /* 1448 * Check if a hop-by-hop options header is contatined in the 1449 * received packet, and if so, store the options as ancillary 1450 * data. Note that a hop-by-hop options header must be 1451 * just after the IPv6 header, which is assured through the 1452 * IPv6 input processing. 1453 */ 1454 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 1455 struct ip6_hbh *hbh; 1456 int hbhlen = 0; 1457 #ifdef PULLDOWN_TEST 1458 struct mbuf *ext; 1459 #endif 1460 1461 #ifndef PULLDOWN_TEST 1462 hbh = (struct ip6_hbh *)(ip6 + 1); 1463 hbhlen = (hbh->ip6h_len + 1) << 3; 1464 #else 1465 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr), 1466 ip6->ip6_nxt); 1467 if (ext == NULL) { 1468 IP6STAT_INC(ip6s_tooshort); 1469 return; 1470 } 1471 hbh = mtod(ext, struct ip6_hbh *); 1472 hbhlen = (hbh->ip6h_len + 1) << 3; 1473 if (hbhlen != ext->m_len) { 1474 m_freem(ext); 1475 IP6STAT_INC(ip6s_tooshort); 1476 return; 1477 } 1478 #endif 1479 1480 /* 1481 * XXX: We copy the whole header even if a 1482 * jumbo payload option is included, the option which 1483 * is to be removed before returning according to 1484 * RFC2292. 1485 * Note: this constraint is removed in RFC3542 1486 */ 1487 *mp = sbcreatecontrol((caddr_t)hbh, hbhlen, 1488 IS2292(in6p, IPV6_2292HOPOPTS, IPV6_HOPOPTS), 1489 IPPROTO_IPV6); 1490 if (*mp) 1491 mp = &(*mp)->m_next; 1492 #ifdef PULLDOWN_TEST 1493 m_freem(ext); 1494 #endif 1495 } 1496 } 1497 1498 if ((in6p->inp_flags & (IN6P_RTHDR | IN6P_DSTOPTS)) != 0) { 1499 int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr); 1500 1501 /* 1502 * Search for destination options headers or routing 1503 * header(s) through the header chain, and stores each 1504 * header as ancillary data. 1505 * Note that the order of the headers remains in 1506 * the chain of ancillary data. 1507 */ 1508 while (1) { /* is explicit loop prevention necessary? */ 1509 struct ip6_ext *ip6e = NULL; 1510 int elen; 1511 #ifdef PULLDOWN_TEST 1512 struct mbuf *ext = NULL; 1513 #endif 1514 1515 /* 1516 * if it is not an extension header, don't try to 1517 * pull it from the chain. 1518 */ 1519 switch (nxt) { 1520 case IPPROTO_DSTOPTS: 1521 case IPPROTO_ROUTING: 1522 case IPPROTO_HOPOPTS: 1523 case IPPROTO_AH: /* is it possible? */ 1524 break; 1525 default: 1526 goto loopend; 1527 } 1528 1529 #ifndef PULLDOWN_TEST 1530 if (off + sizeof(*ip6e) > m->m_len) 1531 goto loopend; 1532 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off); 1533 if (nxt == IPPROTO_AH) 1534 elen = (ip6e->ip6e_len + 2) << 2; 1535 else 1536 elen = (ip6e->ip6e_len + 1) << 3; 1537 if (off + elen > m->m_len) 1538 goto loopend; 1539 #else 1540 ext = ip6_pullexthdr(m, off, nxt); 1541 if (ext == NULL) { 1542 IP6STAT_INC(ip6s_tooshort); 1543 return; 1544 } 1545 ip6e = mtod(ext, struct ip6_ext *); 1546 if (nxt == IPPROTO_AH) 1547 elen = (ip6e->ip6e_len + 2) << 2; 1548 else 1549 elen = (ip6e->ip6e_len + 1) << 3; 1550 if (elen != ext->m_len) { 1551 m_freem(ext); 1552 IP6STAT_INC(ip6s_tooshort); 1553 return; 1554 } 1555 #endif 1556 1557 switch (nxt) { 1558 case IPPROTO_DSTOPTS: 1559 if (!(in6p->inp_flags & IN6P_DSTOPTS)) 1560 break; 1561 1562 *mp = sbcreatecontrol((caddr_t)ip6e, elen, 1563 IS2292(in6p, 1564 IPV6_2292DSTOPTS, IPV6_DSTOPTS), 1565 IPPROTO_IPV6); 1566 if (*mp) 1567 mp = &(*mp)->m_next; 1568 break; 1569 case IPPROTO_ROUTING: 1570 if (!(in6p->inp_flags & IN6P_RTHDR)) 1571 break; 1572 1573 *mp = sbcreatecontrol((caddr_t)ip6e, elen, 1574 IS2292(in6p, IPV6_2292RTHDR, IPV6_RTHDR), 1575 IPPROTO_IPV6); 1576 if (*mp) 1577 mp = &(*mp)->m_next; 1578 break; 1579 case IPPROTO_HOPOPTS: 1580 case IPPROTO_AH: /* is it possible? */ 1581 break; 1582 1583 default: 1584 /* 1585 * other cases have been filtered in the above. 1586 * none will visit this case. here we supply 1587 * the code just in case (nxt overwritten or 1588 * other cases). 1589 */ 1590 #ifdef PULLDOWN_TEST 1591 m_freem(ext); 1592 #endif 1593 goto loopend; 1594 1595 } 1596 1597 /* proceed with the next header. */ 1598 off += elen; 1599 nxt = ip6e->ip6e_nxt; 1600 ip6e = NULL; 1601 #ifdef PULLDOWN_TEST 1602 m_freem(ext); 1603 ext = NULL; 1604 #endif 1605 } 1606 loopend: 1607 ; 1608 } 1609 } 1610 #undef IS2292 1611 1612 void 1613 ip6_notify_pmtu(struct inpcb *in6p, struct sockaddr_in6 *dst, u_int32_t *mtu) 1614 { 1615 struct socket *so; 1616 struct mbuf *m_mtu; 1617 struct ip6_mtuinfo mtuctl; 1618 1619 so = in6p->inp_socket; 1620 1621 if (mtu == NULL) 1622 return; 1623 1624 #ifdef DIAGNOSTIC 1625 if (so == NULL) /* I believe this is impossible */ 1626 panic("ip6_notify_pmtu: socket is NULL"); 1627 #endif 1628 1629 bzero(&mtuctl, sizeof(mtuctl)); /* zero-clear for safety */ 1630 mtuctl.ip6m_mtu = *mtu; 1631 mtuctl.ip6m_addr = *dst; 1632 if (sa6_recoverscope(&mtuctl.ip6m_addr)) 1633 return; 1634 1635 if ((m_mtu = sbcreatecontrol((caddr_t)&mtuctl, sizeof(mtuctl), 1636 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL) 1637 return; 1638 1639 if (sbappendaddr(&so->so_rcv, (struct sockaddr *)dst, NULL, m_mtu) 1640 == 0) { 1641 m_freem(m_mtu); 1642 /* XXX: should count statistics */ 1643 } else 1644 sorwakeup(so); 1645 1646 return; 1647 } 1648 1649 #ifdef PULLDOWN_TEST 1650 /* 1651 * pull single extension header from mbuf chain. returns single mbuf that 1652 * contains the result, or NULL on error. 1653 */ 1654 static struct mbuf * 1655 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt) 1656 { 1657 struct ip6_ext ip6e; 1658 size_t elen; 1659 struct mbuf *n; 1660 1661 #ifdef DIAGNOSTIC 1662 switch (nxt) { 1663 case IPPROTO_DSTOPTS: 1664 case IPPROTO_ROUTING: 1665 case IPPROTO_HOPOPTS: 1666 case IPPROTO_AH: /* is it possible? */ 1667 break; 1668 default: 1669 printf("ip6_pullexthdr: invalid nxt=%d\n", nxt); 1670 } 1671 #endif 1672 1673 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1674 if (nxt == IPPROTO_AH) 1675 elen = (ip6e.ip6e_len + 2) << 2; 1676 else 1677 elen = (ip6e.ip6e_len + 1) << 3; 1678 1679 if (elen > MLEN) 1680 n = m_getcl(M_NOWAIT, MT_DATA, 0); 1681 else 1682 n = m_get(M_NOWAIT, MT_DATA); 1683 if (n == NULL) 1684 return NULL; 1685 1686 m_copydata(m, off, elen, mtod(n, caddr_t)); 1687 n->m_len = elen; 1688 return n; 1689 } 1690 #endif 1691 1692 /* 1693 * Get pointer to the previous header followed by the header 1694 * currently processed. 1695 * XXX: This function supposes that 1696 * M includes all headers, 1697 * the next header field and the header length field of each header 1698 * are valid, and 1699 * the sum of each header length equals to OFF. 1700 * Because of these assumptions, this function must be called very 1701 * carefully. Moreover, it will not be used in the near future when 1702 * we develop `neater' mechanism to process extension headers. 1703 */ 1704 char * 1705 ip6_get_prevhdr(struct mbuf *m, int off) 1706 { 1707 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1708 1709 if (off == sizeof(struct ip6_hdr)) 1710 return (&ip6->ip6_nxt); 1711 else { 1712 int len, nxt; 1713 struct ip6_ext *ip6e = NULL; 1714 1715 nxt = ip6->ip6_nxt; 1716 len = sizeof(struct ip6_hdr); 1717 while (len < off) { 1718 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len); 1719 1720 switch (nxt) { 1721 case IPPROTO_FRAGMENT: 1722 len += sizeof(struct ip6_frag); 1723 break; 1724 case IPPROTO_AH: 1725 len += (ip6e->ip6e_len + 2) << 2; 1726 break; 1727 default: 1728 len += (ip6e->ip6e_len + 1) << 3; 1729 break; 1730 } 1731 nxt = ip6e->ip6e_nxt; 1732 } 1733 if (ip6e) 1734 return (&ip6e->ip6e_nxt); 1735 else 1736 return NULL; 1737 } 1738 } 1739 1740 /* 1741 * get next header offset. m will be retained. 1742 */ 1743 int 1744 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp) 1745 { 1746 struct ip6_hdr ip6; 1747 struct ip6_ext ip6e; 1748 struct ip6_frag fh; 1749 1750 /* just in case */ 1751 if (m == NULL) 1752 panic("ip6_nexthdr: m == NULL"); 1753 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off) 1754 return -1; 1755 1756 switch (proto) { 1757 case IPPROTO_IPV6: 1758 if (m->m_pkthdr.len < off + sizeof(ip6)) 1759 return -1; 1760 m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6); 1761 if (nxtp) 1762 *nxtp = ip6.ip6_nxt; 1763 off += sizeof(ip6); 1764 return off; 1765 1766 case IPPROTO_FRAGMENT: 1767 /* 1768 * terminate parsing if it is not the first fragment, 1769 * it does not make sense to parse through it. 1770 */ 1771 if (m->m_pkthdr.len < off + sizeof(fh)) 1772 return -1; 1773 m_copydata(m, off, sizeof(fh), (caddr_t)&fh); 1774 /* IP6F_OFF_MASK = 0xfff8(BigEndian), 0xf8ff(LittleEndian) */ 1775 if (fh.ip6f_offlg & IP6F_OFF_MASK) 1776 return -1; 1777 if (nxtp) 1778 *nxtp = fh.ip6f_nxt; 1779 off += sizeof(struct ip6_frag); 1780 return off; 1781 1782 case IPPROTO_AH: 1783 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1784 return -1; 1785 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1786 if (nxtp) 1787 *nxtp = ip6e.ip6e_nxt; 1788 off += (ip6e.ip6e_len + 2) << 2; 1789 return off; 1790 1791 case IPPROTO_HOPOPTS: 1792 case IPPROTO_ROUTING: 1793 case IPPROTO_DSTOPTS: 1794 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1795 return -1; 1796 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1797 if (nxtp) 1798 *nxtp = ip6e.ip6e_nxt; 1799 off += (ip6e.ip6e_len + 1) << 3; 1800 return off; 1801 1802 case IPPROTO_NONE: 1803 case IPPROTO_ESP: 1804 case IPPROTO_IPCOMP: 1805 /* give up */ 1806 return -1; 1807 1808 default: 1809 return -1; 1810 } 1811 1812 return -1; 1813 } 1814 1815 /* 1816 * get offset for the last header in the chain. m will be kept untainted. 1817 */ 1818 int 1819 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp) 1820 { 1821 int newoff; 1822 int nxt; 1823 1824 if (!nxtp) { 1825 nxt = -1; 1826 nxtp = &nxt; 1827 } 1828 while (1) { 1829 newoff = ip6_nexthdr(m, off, proto, nxtp); 1830 if (newoff < 0) 1831 return off; 1832 else if (newoff < off) 1833 return -1; /* invalid */ 1834 else if (newoff == off) 1835 return newoff; 1836 1837 off = newoff; 1838 proto = *nxtp; 1839 } 1840 } 1841 1842 static struct ip6aux * 1843 ip6_addaux(struct mbuf *m) 1844 { 1845 struct m_tag *mtag; 1846 1847 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL); 1848 if (!mtag) { 1849 mtag = m_tag_get(PACKET_TAG_IPV6_INPUT, sizeof(struct ip6aux), 1850 M_NOWAIT); 1851 if (mtag) { 1852 m_tag_prepend(m, mtag); 1853 bzero(mtag + 1, sizeof(struct ip6aux)); 1854 } 1855 } 1856 return mtag ? (struct ip6aux *)(mtag + 1) : NULL; 1857 } 1858 1859 static struct ip6aux * 1860 ip6_findaux(struct mbuf *m) 1861 { 1862 struct m_tag *mtag; 1863 1864 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL); 1865 return mtag ? (struct ip6aux *)(mtag + 1) : NULL; 1866 } 1867 1868 static void 1869 ip6_delaux(struct mbuf *m) 1870 { 1871 struct m_tag *mtag; 1872 1873 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL); 1874 if (mtag) 1875 m_tag_delete(m, mtag); 1876 } 1877 1878 /* 1879 * System control for IP6 1880 */ 1881 1882 u_char inet6ctlerrmap[PRC_NCMDS] = { 1883 0, 0, 0, 0, 1884 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 1885 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 1886 EMSGSIZE, EHOSTUNREACH, 0, 0, 1887 0, 0, 0, 0, 1888 ENOPROTOOPT 1889 }; 1890