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