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 extern struct domain inet6domain; 123 124 u_char ip6_protox[IPPROTO_MAX]; 125 VNET_DEFINE(struct in6_ifaddrhead, in6_ifaddrhead); 126 VNET_DEFINE(struct in6_ifaddrlisthead *, in6_ifaddrhashtbl); 127 VNET_DEFINE(u_long, in6_ifaddrhmask); 128 129 static struct netisr_handler ip6_nh = { 130 .nh_name = "ip6", 131 .nh_handler = ip6_input, 132 .nh_proto = NETISR_IPV6, 133 .nh_policy = NETISR_POLICY_FLOW, 134 }; 135 136 VNET_DECLARE(struct callout, in6_tmpaddrtimer_ch); 137 #define V_in6_tmpaddrtimer_ch VNET(in6_tmpaddrtimer_ch) 138 139 VNET_DEFINE(struct pfil_head, inet6_pfil_hook); 140 141 VNET_PCPUSTAT_DEFINE(struct ip6stat, ip6stat); 142 VNET_PCPUSTAT_SYSINIT(ip6stat); 143 #ifdef VIMAGE 144 VNET_PCPUSTAT_SYSUNINIT(ip6stat); 145 #endif /* VIMAGE */ 146 147 struct rwlock in6_ifaddr_lock; 148 RW_SYSINIT(in6_ifaddr_lock, &in6_ifaddr_lock, "in6_ifaddr_lock"); 149 150 static void ip6_init2(void *); 151 static struct ip6aux *ip6_setdstifaddr(struct mbuf *, struct in6_ifaddr *); 152 static struct ip6aux *ip6_addaux(struct mbuf *); 153 static struct ip6aux *ip6_findaux(struct mbuf *m); 154 static void ip6_delaux (struct mbuf *); 155 static int ip6_hopopts_input(u_int32_t *, u_int32_t *, struct mbuf **, int *); 156 #ifdef PULLDOWN_TEST 157 static struct mbuf *ip6_pullexthdr(struct mbuf *, size_t, int); 158 #endif 159 160 /* 161 * IP6 initialization: fill in IP6 protocol switch table. 162 * All protocols not implemented in kernel go to raw IP6 protocol handler. 163 */ 164 void 165 ip6_init(void) 166 { 167 struct ip6protosw *pr; 168 int i; 169 170 TUNABLE_INT_FETCH("net.inet6.ip6.auto_linklocal", 171 &V_ip6_auto_linklocal); 172 TUNABLE_INT_FETCH("net.inet6.ip6.accept_rtadv", &V_ip6_accept_rtadv); 173 TUNABLE_INT_FETCH("net.inet6.ip6.no_radr", &V_ip6_no_radr); 174 175 TAILQ_INIT(&V_in6_ifaddrhead); 176 V_in6_ifaddrhashtbl = hashinit(IN6ADDR_NHASH, M_IFADDR, 177 &V_in6_ifaddrhmask); 178 179 /* Initialize packet filter hooks. */ 180 V_inet6_pfil_hook.ph_type = PFIL_TYPE_AF; 181 V_inet6_pfil_hook.ph_af = AF_INET6; 182 if ((i = pfil_head_register(&V_inet6_pfil_hook)) != 0) 183 printf("%s: WARNING: unable to register pfil hook, " 184 "error %d\n", __func__, i); 185 186 scope6_init(); 187 addrsel_policy_init(); 188 nd6_init(); 189 frag6_init(); 190 191 V_ip6_desync_factor = arc4random() % MAX_TEMP_DESYNC_FACTOR; 192 193 /* Skip global initialization stuff for non-default instances. */ 194 if (!IS_DEFAULT_VNET(curvnet)) 195 return; 196 197 #ifdef DIAGNOSTIC 198 if (sizeof(struct protosw) != sizeof(struct ip6protosw)) 199 panic("sizeof(protosw) != sizeof(ip6protosw)"); 200 #endif 201 pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 202 if (pr == NULL) 203 panic("ip6_init"); 204 205 /* Initialize the entire ip6_protox[] array to IPPROTO_RAW. */ 206 for (i = 0; i < IPPROTO_MAX; i++) 207 ip6_protox[i] = pr - inet6sw; 208 /* 209 * Cycle through IP protocols and put them into the appropriate place 210 * in ip6_protox[]. 211 */ 212 for (pr = (struct ip6protosw *)inet6domain.dom_protosw; 213 pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++) 214 if (pr->pr_domain->dom_family == PF_INET6 && 215 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) { 216 /* Be careful to only index valid IP protocols. */ 217 if (pr->pr_protocol < IPPROTO_MAX) 218 ip6_protox[pr->pr_protocol] = pr - inet6sw; 219 } 220 221 netisr_register(&ip6_nh); 222 } 223 224 /* 225 * The protocol to be inserted into ip6_protox[] must be already registered 226 * in inet6sw[], either statically or through pf_proto_register(). 227 */ 228 int 229 ip6proto_register(short ip6proto) 230 { 231 struct ip6protosw *pr; 232 233 /* Sanity checks. */ 234 if (ip6proto <= 0 || ip6proto >= IPPROTO_MAX) 235 return (EPROTONOSUPPORT); 236 237 /* 238 * The protocol slot must not be occupied by another protocol 239 * already. An index pointing to IPPROTO_RAW is unused. 240 */ 241 pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 242 if (pr == NULL) 243 return (EPFNOSUPPORT); 244 if (ip6_protox[ip6proto] != pr - inet6sw) /* IPPROTO_RAW */ 245 return (EEXIST); 246 247 /* 248 * Find the protocol position in inet6sw[] and set the index. 249 */ 250 for (pr = (struct ip6protosw *)inet6domain.dom_protosw; 251 pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++) { 252 if (pr->pr_domain->dom_family == PF_INET6 && 253 pr->pr_protocol && pr->pr_protocol == ip6proto) { 254 ip6_protox[pr->pr_protocol] = pr - inet6sw; 255 return (0); 256 } 257 } 258 return (EPROTONOSUPPORT); 259 } 260 261 int 262 ip6proto_unregister(short ip6proto) 263 { 264 struct ip6protosw *pr; 265 266 /* Sanity checks. */ 267 if (ip6proto <= 0 || ip6proto >= IPPROTO_MAX) 268 return (EPROTONOSUPPORT); 269 270 /* Check if the protocol was indeed registered. */ 271 pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 272 if (pr == NULL) 273 return (EPFNOSUPPORT); 274 if (ip6_protox[ip6proto] == pr - inet6sw) /* IPPROTO_RAW */ 275 return (ENOENT); 276 277 /* Reset the protocol slot to IPPROTO_RAW. */ 278 ip6_protox[ip6proto] = pr - inet6sw; 279 return (0); 280 } 281 282 #ifdef VIMAGE 283 void 284 ip6_destroy() 285 { 286 int i; 287 288 if ((i = pfil_head_unregister(&V_inet6_pfil_hook)) != 0) 289 printf("%s: WARNING: unable to unregister pfil hook, " 290 "error %d\n", __func__, i); 291 hashdestroy(V_in6_ifaddrhashtbl, M_IFADDR, V_in6_ifaddrhmask); 292 nd6_destroy(); 293 callout_drain(&V_in6_tmpaddrtimer_ch); 294 } 295 #endif 296 297 static int 298 ip6_init2_vnet(const void *unused __unused) 299 { 300 301 /* nd6_timer_init */ 302 callout_init(&V_nd6_timer_ch, 0); 303 callout_reset(&V_nd6_timer_ch, hz, nd6_timer, curvnet); 304 305 /* timer for regeneranation of temporary addresses randomize ID */ 306 callout_init(&V_in6_tmpaddrtimer_ch, 0); 307 callout_reset(&V_in6_tmpaddrtimer_ch, 308 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor - 309 V_ip6_temp_regen_advance) * hz, 310 in6_tmpaddrtimer, curvnet); 311 312 return (0); 313 } 314 315 static void 316 ip6_init2(void *dummy) 317 { 318 319 ip6_init2_vnet(NULL); 320 } 321 322 /* cheat */ 323 /* This must be after route_init(), which is now SI_ORDER_THIRD */ 324 SYSINIT(netinet6init2, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ip6_init2, NULL); 325 326 static int 327 ip6_input_hbh(struct mbuf *m, uint32_t *plen, uint32_t *rtalert, int *off, 328 int *nxt, int *ours) 329 { 330 struct ip6_hdr *ip6; 331 struct ip6_hbh *hbh; 332 333 if (ip6_hopopts_input(plen, rtalert, &m, off)) { 334 #if 0 /*touches NULL pointer*/ 335 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 336 #endif 337 goto out; /* m have already been freed */ 338 } 339 340 /* adjust pointer */ 341 ip6 = mtod(m, struct ip6_hdr *); 342 343 /* 344 * if the payload length field is 0 and the next header field 345 * indicates Hop-by-Hop Options header, then a Jumbo Payload 346 * option MUST be included. 347 */ 348 if (ip6->ip6_plen == 0 && *plen == 0) { 349 /* 350 * Note that if a valid jumbo payload option is 351 * contained, ip6_hopopts_input() must set a valid 352 * (non-zero) payload length to the variable plen. 353 */ 354 IP6STAT_INC(ip6s_badoptions); 355 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 356 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 357 icmp6_error(m, ICMP6_PARAM_PROB, 358 ICMP6_PARAMPROB_HEADER, 359 (caddr_t)&ip6->ip6_plen - (caddr_t)ip6); 360 goto out; 361 } 362 #ifndef PULLDOWN_TEST 363 /* ip6_hopopts_input() ensures that mbuf is contiguous */ 364 hbh = (struct ip6_hbh *)(ip6 + 1); 365 #else 366 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 367 sizeof(struct ip6_hbh)); 368 if (hbh == NULL) { 369 IP6STAT_INC(ip6s_tooshort); 370 goto out; 371 } 372 #endif 373 *nxt = hbh->ip6h_nxt; 374 375 /* 376 * If we are acting as a router and the packet contains a 377 * router alert option, see if we know the option value. 378 * Currently, we only support the option value for MLD, in which 379 * case we should pass the packet to the multicast routing 380 * daemon. 381 */ 382 if (*rtalert != ~0) { 383 switch (*rtalert) { 384 case IP6OPT_RTALERT_MLD: 385 if (V_ip6_forwarding) 386 *ours = 1; 387 break; 388 default: 389 /* 390 * RFC2711 requires unrecognized values must be 391 * silently ignored. 392 */ 393 break; 394 } 395 } 396 397 return (0); 398 399 out: 400 return (1); 401 } 402 403 void 404 ip6_input(struct mbuf *m) 405 { 406 struct ip6_hdr *ip6; 407 int off = sizeof(struct ip6_hdr), nest; 408 u_int32_t plen; 409 u_int32_t rtalert = ~0; 410 int nxt, ours = 0; 411 struct ifnet *deliverifp = NULL, *ifp = NULL; 412 struct in6_addr odst; 413 struct route_in6 rin6; 414 int srcrt = 0; 415 struct llentry *lle = NULL; 416 struct sockaddr_in6 dst6, *dst; 417 418 bzero(&rin6, sizeof(struct route_in6)); 419 #ifdef IPSEC 420 /* 421 * should the inner packet be considered authentic? 422 * see comment in ah4_input(). 423 * NB: m cannot be NULL when passed to the input routine 424 */ 425 426 m->m_flags &= ~M_AUTHIPHDR; 427 m->m_flags &= ~M_AUTHIPDGM; 428 429 #endif /* IPSEC */ 430 431 /* 432 * make sure we don't have onion peering information into m_tag. 433 */ 434 ip6_delaux(m); 435 436 if (m->m_flags & M_FASTFWD_OURS) { 437 /* 438 * Firewall changed destination to local. 439 */ 440 m->m_flags &= ~M_FASTFWD_OURS; 441 ours = 1; 442 deliverifp = m->m_pkthdr.rcvif; 443 ip6 = mtod(m, struct ip6_hdr *); 444 goto hbhcheck; 445 } 446 447 /* 448 * mbuf statistics 449 */ 450 if (m->m_flags & M_EXT) { 451 if (m->m_next) 452 IP6STAT_INC(ip6s_mext2m); 453 else 454 IP6STAT_INC(ip6s_mext1); 455 } else { 456 if (m->m_next) { 457 if (m->m_flags & M_LOOP) { 458 IP6STAT_INC(ip6s_m2m[V_loif->if_index]); 459 } else if (m->m_pkthdr.rcvif->if_index < IP6S_M2MMAX) 460 IP6STAT_INC( 461 ip6s_m2m[m->m_pkthdr.rcvif->if_index]); 462 else 463 IP6STAT_INC(ip6s_m2m[0]); 464 } else 465 IP6STAT_INC(ip6s_m1); 466 } 467 468 /* drop the packet if IPv6 operation is disabled on the IF */ 469 if ((ND_IFINFO(m->m_pkthdr.rcvif)->flags & ND6_IFF_IFDISABLED)) { 470 m_freem(m); 471 return; 472 } 473 474 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive); 475 IP6STAT_INC(ip6s_total); 476 477 #ifndef PULLDOWN_TEST 478 /* 479 * L2 bridge code and some other code can return mbuf chain 480 * that does not conform to KAME requirement. too bad. 481 * XXX: fails to join if interface MTU > MCLBYTES. jumbogram? 482 */ 483 if (m && m->m_next != NULL && m->m_pkthdr.len < MCLBYTES) { 484 struct mbuf *n; 485 486 if (m->m_pkthdr.len > MHLEN) 487 n = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 488 else 489 n = m_gethdr(M_NOWAIT, MT_DATA); 490 if (n == NULL) { 491 m_freem(m); 492 return; /* ENOBUFS */ 493 } 494 495 m_move_pkthdr(n, m); 496 m_copydata(m, 0, n->m_pkthdr.len, mtod(n, caddr_t)); 497 n->m_len = n->m_pkthdr.len; 498 m_freem(m); 499 m = n; 500 } 501 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), /* nothing */); 502 #endif 503 504 if (m->m_len < sizeof(struct ip6_hdr)) { 505 struct ifnet *inifp; 506 inifp = m->m_pkthdr.rcvif; 507 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 508 IP6STAT_INC(ip6s_toosmall); 509 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 510 return; 511 } 512 } 513 514 ip6 = mtod(m, struct ip6_hdr *); 515 516 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 517 IP6STAT_INC(ip6s_badvers); 518 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 519 goto bad; 520 } 521 522 IP6STAT_INC(ip6s_nxthist[ip6->ip6_nxt]); 523 524 IP_PROBE(receive, NULL, NULL, ip6, m->m_pkthdr.rcvif, NULL, ip6); 525 526 /* 527 * Check against address spoofing/corruption. 528 */ 529 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) || 530 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) { 531 /* 532 * XXX: "badscope" is not very suitable for a multicast source. 533 */ 534 IP6STAT_INC(ip6s_badscope); 535 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 536 goto bad; 537 } 538 if (IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) && 539 !(m->m_flags & M_LOOP)) { 540 /* 541 * In this case, the packet should come from the loopback 542 * interface. However, we cannot just check the if_flags, 543 * because ip6_mloopback() passes the "actual" interface 544 * as the outgoing/incoming interface. 545 */ 546 IP6STAT_INC(ip6s_badscope); 547 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 548 goto bad; 549 } 550 551 #ifdef ALTQ 552 if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) { 553 /* packet is dropped by traffic conditioner */ 554 return; 555 } 556 #endif 557 /* 558 * The following check is not documented in specs. A malicious 559 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack 560 * and bypass security checks (act as if it was from 127.0.0.1 by using 561 * IPv6 src ::ffff:127.0.0.1). Be cautious. 562 * 563 * This check chokes if we are in an SIIT cloud. As none of BSDs 564 * support IPv4-less kernel compilation, we cannot support SIIT 565 * environment at all. So, it makes more sense for us to reject any 566 * malicious packets for non-SIIT environment, than try to do a 567 * partial support for SIIT environment. 568 */ 569 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 570 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 571 IP6STAT_INC(ip6s_badscope); 572 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 573 goto bad; 574 } 575 #if 0 576 /* 577 * Reject packets with IPv4 compatible addresses (auto tunnel). 578 * 579 * The code forbids auto tunnel relay case in RFC1933 (the check is 580 * stronger than RFC1933). We may want to re-enable it if mech-xx 581 * is revised to forbid relaying case. 582 */ 583 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) || 584 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) { 585 IP6STAT_INC(ip6s_badscope); 586 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 587 goto bad; 588 } 589 #endif 590 #ifdef IPSEC 591 /* 592 * Bypass packet filtering for packets previously handled by IPsec. 593 */ 594 if (ip6_ipsec_filtertunnel(m)) 595 goto passin; 596 #endif /* IPSEC */ 597 598 /* 599 * Run through list of hooks for input packets. 600 * 601 * NB: Beware of the destination address changing 602 * (e.g. by NAT rewriting). When this happens, 603 * tell ip6_forward to do the right thing. 604 */ 605 odst = ip6->ip6_dst; 606 607 /* Jump over all PFIL processing if hooks are not active. */ 608 if (!PFIL_HOOKED(&V_inet6_pfil_hook)) 609 goto passin; 610 611 if (pfil_run_hooks(&V_inet6_pfil_hook, &m, 612 m->m_pkthdr.rcvif, PFIL_IN, NULL)) 613 return; 614 if (m == NULL) /* consumed by filter */ 615 return; 616 ip6 = mtod(m, struct ip6_hdr *); 617 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst); 618 619 if (m->m_flags & M_FASTFWD_OURS) { 620 m->m_flags &= ~M_FASTFWD_OURS; 621 ours = 1; 622 deliverifp = m->m_pkthdr.rcvif; 623 goto hbhcheck; 624 } 625 if ((m->m_flags & M_IP6_NEXTHOP) && 626 m_tag_find(m, PACKET_TAG_IPFORWARD, NULL) != NULL) { 627 /* 628 * Directly ship the packet on. This allows forwarding 629 * packets originally destined to us to some other directly 630 * connected host. 631 */ 632 ip6_forward(m, 1); 633 goto out; 634 } 635 636 passin: 637 /* 638 * Disambiguate address scope zones (if there is ambiguity). 639 * We first make sure that the original source or destination address 640 * is not in our internal form for scoped addresses. Such addresses 641 * are not necessarily invalid spec-wise, but we cannot accept them due 642 * to the usage conflict. 643 * in6_setscope() then also checks and rejects the cases where src or 644 * dst are the loopback address and the receiving interface 645 * is not loopback. 646 */ 647 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) { 648 IP6STAT_INC(ip6s_badscope); /* XXX */ 649 goto bad; 650 } 651 if (in6_setscope(&ip6->ip6_src, m->m_pkthdr.rcvif, NULL) || 652 in6_setscope(&ip6->ip6_dst, m->m_pkthdr.rcvif, NULL)) { 653 IP6STAT_INC(ip6s_badscope); 654 goto bad; 655 } 656 657 /* 658 * Multicast check. Assume packet is for us to avoid 659 * prematurely taking locks. 660 */ 661 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 662 ours = 1; 663 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast); 664 deliverifp = m->m_pkthdr.rcvif; 665 goto hbhcheck; 666 } 667 668 /* 669 * Unicast check 670 */ 671 672 bzero(&dst6, sizeof(dst6)); 673 dst6.sin6_family = AF_INET6; 674 dst6.sin6_len = sizeof(struct sockaddr_in6); 675 dst6.sin6_addr = ip6->ip6_dst; 676 ifp = m->m_pkthdr.rcvif; 677 IF_AFDATA_RLOCK(ifp); 678 lle = lla_lookup(LLTABLE6(ifp), 0, 679 (struct sockaddr *)&dst6); 680 IF_AFDATA_RUNLOCK(ifp); 681 if ((lle != NULL) && (lle->la_flags & LLE_IFADDR)) { 682 struct ifaddr *ifa; 683 struct in6_ifaddr *ia6; 684 int bad; 685 686 bad = 1; 687 #define sa_equal(a1, a2) \ 688 (bcmp((a1), (a2), ((a1))->sin6_len) == 0) 689 IF_ADDR_RLOCK(ifp); 690 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 691 if (ifa->ifa_addr->sa_family != dst6.sin6_family) 692 continue; 693 if (sa_equal(&dst6, ifa->ifa_addr)) 694 break; 695 } 696 KASSERT(ifa != NULL, ("%s: ifa not found for lle %p", 697 __func__, lle)); 698 #undef sa_equal 699 700 ia6 = (struct in6_ifaddr *)ifa; 701 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) { 702 /* Count the packet in the ip address stats */ 703 counter_u64_add(ia6->ia_ifa.ifa_ipackets, 1); 704 counter_u64_add(ia6->ia_ifa.ifa_ibytes, 705 m->m_pkthdr.len); 706 707 /* 708 * record address information into m_tag. 709 */ 710 (void)ip6_setdstifaddr(m, ia6); 711 712 bad = 0; 713 } else { 714 char ip6bufs[INET6_ADDRSTRLEN]; 715 char ip6bufd[INET6_ADDRSTRLEN]; 716 /* address is not ready, so discard the packet. */ 717 nd6log((LOG_INFO, 718 "ip6_input: packet to an unready address %s->%s\n", 719 ip6_sprintf(ip6bufs, &ip6->ip6_src), 720 ip6_sprintf(ip6bufd, &ip6->ip6_dst))); 721 } 722 IF_ADDR_RUNLOCK(ifp); 723 LLE_RUNLOCK(lle); 724 if (bad) 725 goto bad; 726 else { 727 ours = 1; 728 deliverifp = ifp; 729 goto hbhcheck; 730 } 731 } 732 if (lle != NULL) 733 LLE_RUNLOCK(lle); 734 735 dst = &rin6.ro_dst; 736 dst->sin6_len = sizeof(struct sockaddr_in6); 737 dst->sin6_family = AF_INET6; 738 dst->sin6_addr = ip6->ip6_dst; 739 rin6.ro_rt = in6_rtalloc1((struct sockaddr *)dst, 0, 0, M_GETFIB(m)); 740 if (rin6.ro_rt) 741 RT_UNLOCK(rin6.ro_rt); 742 743 #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key)) 744 745 /* 746 * Accept the packet if the forwarding interface to the destination 747 * according to the routing table is the loopback interface, 748 * unless the associated route has a gateway. 749 * Note that this approach causes to accept a packet if there is a 750 * route to the loopback interface for the destination of the packet. 751 * But we think it's even useful in some situations, e.g. when using 752 * a special daemon which wants to intercept the packet. 753 * 754 * XXX: some OSes automatically make a cloned route for the destination 755 * of an outgoing packet. If the outgoing interface of the packet 756 * is a loopback one, the kernel would consider the packet to be 757 * accepted, even if we have no such address assinged on the interface. 758 * We check the cloned flag of the route entry to reject such cases, 759 * assuming that route entries for our own addresses are not made by 760 * cloning (it should be true because in6_addloop explicitly installs 761 * the host route). However, we might have to do an explicit check 762 * while it would be less efficient. Or, should we rather install a 763 * reject route for such a case? 764 */ 765 if (rin6.ro_rt && 766 (rin6.ro_rt->rt_flags & 767 (RTF_HOST|RTF_GATEWAY)) == RTF_HOST && 768 #ifdef RTF_WASCLONED 769 !(rin6.ro_rt->rt_flags & RTF_WASCLONED) && 770 #endif 771 #ifdef RTF_CLONED 772 !(rin6.ro_rt->rt_flags & RTF_CLONED) && 773 #endif 774 #if 0 775 /* 776 * The check below is redundant since the comparison of 777 * the destination and the key of the rtentry has 778 * already done through looking up the routing table. 779 */ 780 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 781 &rt6_key(rin6.ro_rt)->sin6_addr) 782 #endif 783 rin6.ro_rt->rt_ifp->if_type == IFT_LOOP) { 784 int free_ia6 = 0; 785 struct in6_ifaddr *ia6; 786 787 /* 788 * found the loopback route to the interface address 789 */ 790 if (rin6.ro_rt->rt_gateway->sa_family == AF_LINK) { 791 struct sockaddr_in6 dest6; 792 793 bzero(&dest6, sizeof(dest6)); 794 dest6.sin6_family = AF_INET6; 795 dest6.sin6_len = sizeof(dest6); 796 dest6.sin6_addr = ip6->ip6_dst; 797 ia6 = (struct in6_ifaddr *) 798 ifa_ifwithaddr((struct sockaddr *)&dest6); 799 if (ia6 == NULL) 800 goto bad; 801 free_ia6 = 1; 802 } 803 else 804 ia6 = (struct in6_ifaddr *)rin6.ro_rt->rt_ifa; 805 806 /* 807 * record address information into m_tag. 808 */ 809 (void)ip6_setdstifaddr(m, ia6); 810 811 /* 812 * packets to a tentative, duplicated, or somehow invalid 813 * address must not be accepted. 814 */ 815 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) { 816 /* this address is ready */ 817 ours = 1; 818 deliverifp = ia6->ia_ifp; /* correct? */ 819 /* Count the packet in the ip address stats */ 820 counter_u64_add(ia6->ia_ifa.ifa_ipackets, 1); 821 counter_u64_add(ia6->ia_ifa.ifa_ibytes, 822 m->m_pkthdr.len); 823 if (free_ia6) 824 ifa_free(&ia6->ia_ifa); 825 goto hbhcheck; 826 } else { 827 char ip6bufs[INET6_ADDRSTRLEN]; 828 char ip6bufd[INET6_ADDRSTRLEN]; 829 /* address is not ready, so discard the packet. */ 830 nd6log((LOG_INFO, 831 "ip6_input: packet to an unready address %s->%s\n", 832 ip6_sprintf(ip6bufs, &ip6->ip6_src), 833 ip6_sprintf(ip6bufd, &ip6->ip6_dst))); 834 835 if (free_ia6) 836 ifa_free(&ia6->ia_ifa); 837 goto bad; 838 } 839 } 840 841 /* 842 * FAITH (Firewall Aided Internet Translator) 843 */ 844 if (V_ip6_keepfaith) { 845 if (rin6.ro_rt && rin6.ro_rt->rt_ifp && 846 rin6.ro_rt->rt_ifp->if_type == IFT_FAITH) { 847 /* XXX do we need more sanity checks? */ 848 ours = 1; 849 deliverifp = rin6.ro_rt->rt_ifp; /* faith */ 850 goto hbhcheck; 851 } 852 } 853 854 /* 855 * Now there is no reason to process the packet if it's not our own 856 * and we're not a router. 857 */ 858 if (!V_ip6_forwarding) { 859 IP6STAT_INC(ip6s_cantforward); 860 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 861 goto bad; 862 } 863 864 hbhcheck: 865 /* 866 * record address information into m_tag, if we don't have one yet. 867 * note that we are unable to record it, if the address is not listed 868 * as our interface address (e.g. multicast addresses, addresses 869 * within FAITH prefixes and such). 870 */ 871 if (deliverifp) { 872 struct in6_ifaddr *ia6; 873 874 if ((ia6 = ip6_getdstifaddr(m)) != NULL) { 875 ifa_free(&ia6->ia_ifa); 876 } else { 877 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 878 if (ia6) { 879 if (!ip6_setdstifaddr(m, ia6)) { 880 /* 881 * XXX maybe we should drop the packet here, 882 * as we could not provide enough information 883 * to the upper layers. 884 */ 885 } 886 ifa_free(&ia6->ia_ifa); 887 } 888 } 889 } 890 891 /* 892 * Process Hop-by-Hop options header if it's contained. 893 * m may be modified in ip6_hopopts_input(). 894 * If a JumboPayload option is included, plen will also be modified. 895 */ 896 plen = (u_int32_t)ntohs(ip6->ip6_plen); 897 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 898 int error; 899 900 error = ip6_input_hbh(m, &plen, &rtalert, &off, &nxt, &ours); 901 if (error != 0) 902 goto out; 903 } else 904 nxt = ip6->ip6_nxt; 905 906 /* 907 * Check that the amount of data in the buffers 908 * is as at least much as the IPv6 header would have us expect. 909 * Trim mbufs if longer than we expect. 910 * Drop packet if shorter than we expect. 911 */ 912 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 913 IP6STAT_INC(ip6s_tooshort); 914 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 915 goto bad; 916 } 917 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 918 if (m->m_len == m->m_pkthdr.len) { 919 m->m_len = sizeof(struct ip6_hdr) + plen; 920 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 921 } else 922 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 923 } 924 925 /* 926 * Forward if desirable. 927 */ 928 if (V_ip6_mrouter && 929 IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 930 /* 931 * If we are acting as a multicast router, all 932 * incoming multicast packets are passed to the 933 * kernel-level multicast forwarding function. 934 * The packet is returned (relatively) intact; if 935 * ip6_mforward() returns a non-zero value, the packet 936 * must be discarded, else it may be accepted below. 937 * 938 * XXX TODO: Check hlim and multicast scope here to avoid 939 * unnecessarily calling into ip6_mforward(). 940 */ 941 if (ip6_mforward && 942 ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) { 943 IP6STAT_INC(ip6s_cantforward); 944 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 945 goto bad; 946 } 947 } else if (!ours) { 948 ip6_forward(m, srcrt); 949 goto out; 950 } 951 952 ip6 = mtod(m, struct ip6_hdr *); 953 954 /* 955 * Malicious party may be able to use IPv4 mapped addr to confuse 956 * tcp/udp stack and bypass security checks (act as if it was from 957 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious. 958 * 959 * For SIIT end node behavior, you may want to disable the check. 960 * However, you will become vulnerable to attacks using IPv4 mapped 961 * source. 962 */ 963 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 964 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 965 IP6STAT_INC(ip6s_badscope); 966 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 967 goto bad; 968 } 969 970 /* 971 * Tell launch routine the next header 972 */ 973 IP6STAT_INC(ip6s_delivered); 974 in6_ifstat_inc(deliverifp, ifs6_in_deliver); 975 nest = 0; 976 977 while (nxt != IPPROTO_DONE) { 978 if (V_ip6_hdrnestlimit && (++nest > V_ip6_hdrnestlimit)) { 979 IP6STAT_INC(ip6s_toomanyhdr); 980 goto bad; 981 } 982 983 /* 984 * protection against faulty packet - there should be 985 * more sanity checks in header chain processing. 986 */ 987 if (m->m_pkthdr.len < off) { 988 IP6STAT_INC(ip6s_tooshort); 989 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 990 goto bad; 991 } 992 993 #ifdef IPSEC 994 /* 995 * enforce IPsec policy checking if we are seeing last header. 996 * note that we do not visit this with protocols with pcb layer 997 * code - like udp/tcp/raw ip. 998 */ 999 if (ip6_ipsec_input(m, nxt)) 1000 goto bad; 1001 #endif /* IPSEC */ 1002 1003 /* 1004 * Use mbuf flags to propagate Router Alert option to 1005 * ICMPv6 layer, as hop-by-hop options have been stripped. 1006 */ 1007 if (nxt == IPPROTO_ICMPV6 && rtalert != ~0) 1008 m->m_flags |= M_RTALERT_MLD; 1009 1010 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt); 1011 } 1012 goto out; 1013 bad: 1014 m_freem(m); 1015 out: 1016 if (rin6.ro_rt) 1017 RTFREE(rin6.ro_rt); 1018 } 1019 1020 /* 1021 * set/grab in6_ifaddr correspond to IPv6 destination address. 1022 * XXX backward compatibility wrapper 1023 * 1024 * XXXRW: We should bump the refcount on ia6 before sticking it in the m_tag, 1025 * and then bump it when the tag is copied, and release it when the tag is 1026 * freed. Unfortunately, m_tags don't support deep copies (yet), so instead 1027 * we just bump the ia refcount when we receive it. This should be fixed. 1028 */ 1029 static struct ip6aux * 1030 ip6_setdstifaddr(struct mbuf *m, struct in6_ifaddr *ia6) 1031 { 1032 struct ip6aux *ip6a; 1033 1034 ip6a = ip6_addaux(m); 1035 if (ip6a) 1036 ip6a->ip6a_dstia6 = ia6; 1037 return ip6a; /* NULL if failed to set */ 1038 } 1039 1040 struct in6_ifaddr * 1041 ip6_getdstifaddr(struct mbuf *m) 1042 { 1043 struct ip6aux *ip6a; 1044 struct in6_ifaddr *ia; 1045 1046 ip6a = ip6_findaux(m); 1047 if (ip6a) { 1048 ia = ip6a->ip6a_dstia6; 1049 ifa_ref(&ia->ia_ifa); 1050 return ia; 1051 } else 1052 return NULL; 1053 } 1054 1055 /* 1056 * Hop-by-Hop options header processing. If a valid jumbo payload option is 1057 * included, the real payload length will be stored in plenp. 1058 * 1059 * rtalertp - XXX: should be stored more smart way 1060 */ 1061 static int 1062 ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp, 1063 struct mbuf **mp, int *offp) 1064 { 1065 struct mbuf *m = *mp; 1066 int off = *offp, hbhlen; 1067 struct ip6_hbh *hbh; 1068 u_int8_t *opt; 1069 1070 /* validation of the length of the header */ 1071 #ifndef PULLDOWN_TEST 1072 IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1); 1073 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); 1074 hbhlen = (hbh->ip6h_len + 1) << 3; 1075 1076 IP6_EXTHDR_CHECK(m, off, hbhlen, -1); 1077 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); 1078 #else 1079 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, 1080 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh)); 1081 if (hbh == NULL) { 1082 IP6STAT_INC(ip6s_tooshort); 1083 return -1; 1084 } 1085 hbhlen = (hbh->ip6h_len + 1) << 3; 1086 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 1087 hbhlen); 1088 if (hbh == NULL) { 1089 IP6STAT_INC(ip6s_tooshort); 1090 return -1; 1091 } 1092 #endif 1093 off += hbhlen; 1094 hbhlen -= sizeof(struct ip6_hbh); 1095 opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh); 1096 1097 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 1098 hbhlen, rtalertp, plenp) < 0) 1099 return (-1); 1100 1101 *offp = off; 1102 *mp = m; 1103 return (0); 1104 } 1105 1106 /* 1107 * Search header for all Hop-by-hop options and process each option. 1108 * This function is separate from ip6_hopopts_input() in order to 1109 * handle a case where the sending node itself process its hop-by-hop 1110 * options header. In such a case, the function is called from ip6_output(). 1111 * 1112 * The function assumes that hbh header is located right after the IPv6 header 1113 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to 1114 * opthead + hbhlen is located in contiguous memory region. 1115 */ 1116 int 1117 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen, 1118 u_int32_t *rtalertp, u_int32_t *plenp) 1119 { 1120 struct ip6_hdr *ip6; 1121 int optlen = 0; 1122 u_int8_t *opt = opthead; 1123 u_int16_t rtalert_val; 1124 u_int32_t jumboplen; 1125 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh); 1126 1127 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 1128 switch (*opt) { 1129 case IP6OPT_PAD1: 1130 optlen = 1; 1131 break; 1132 case IP6OPT_PADN: 1133 if (hbhlen < IP6OPT_MINLEN) { 1134 IP6STAT_INC(ip6s_toosmall); 1135 goto bad; 1136 } 1137 optlen = *(opt + 1) + 2; 1138 break; 1139 case IP6OPT_ROUTER_ALERT: 1140 /* XXX may need check for alignment */ 1141 if (hbhlen < IP6OPT_RTALERT_LEN) { 1142 IP6STAT_INC(ip6s_toosmall); 1143 goto bad; 1144 } 1145 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) { 1146 /* XXX stat */ 1147 icmp6_error(m, ICMP6_PARAM_PROB, 1148 ICMP6_PARAMPROB_HEADER, 1149 erroff + opt + 1 - opthead); 1150 return (-1); 1151 } 1152 optlen = IP6OPT_RTALERT_LEN; 1153 bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2); 1154 *rtalertp = ntohs(rtalert_val); 1155 break; 1156 case IP6OPT_JUMBO: 1157 /* XXX may need check for alignment */ 1158 if (hbhlen < IP6OPT_JUMBO_LEN) { 1159 IP6STAT_INC(ip6s_toosmall); 1160 goto bad; 1161 } 1162 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) { 1163 /* XXX stat */ 1164 icmp6_error(m, ICMP6_PARAM_PROB, 1165 ICMP6_PARAMPROB_HEADER, 1166 erroff + opt + 1 - opthead); 1167 return (-1); 1168 } 1169 optlen = IP6OPT_JUMBO_LEN; 1170 1171 /* 1172 * IPv6 packets that have non 0 payload length 1173 * must not contain a jumbo payload option. 1174 */ 1175 ip6 = mtod(m, struct ip6_hdr *); 1176 if (ip6->ip6_plen) { 1177 IP6STAT_INC(ip6s_badoptions); 1178 icmp6_error(m, ICMP6_PARAM_PROB, 1179 ICMP6_PARAMPROB_HEADER, 1180 erroff + opt - opthead); 1181 return (-1); 1182 } 1183 1184 /* 1185 * We may see jumbolen in unaligned location, so 1186 * we'd need to perform bcopy(). 1187 */ 1188 bcopy(opt + 2, &jumboplen, sizeof(jumboplen)); 1189 jumboplen = (u_int32_t)htonl(jumboplen); 1190 1191 #if 1 1192 /* 1193 * if there are multiple jumbo payload options, 1194 * *plenp will be non-zero and the packet will be 1195 * rejected. 1196 * the behavior may need some debate in ipngwg - 1197 * multiple options does not make sense, however, 1198 * there's no explicit mention in specification. 1199 */ 1200 if (*plenp != 0) { 1201 IP6STAT_INC(ip6s_badoptions); 1202 icmp6_error(m, ICMP6_PARAM_PROB, 1203 ICMP6_PARAMPROB_HEADER, 1204 erroff + opt + 2 - opthead); 1205 return (-1); 1206 } 1207 #endif 1208 1209 /* 1210 * jumbo payload length must be larger than 65535. 1211 */ 1212 if (jumboplen <= IPV6_MAXPACKET) { 1213 IP6STAT_INC(ip6s_badoptions); 1214 icmp6_error(m, ICMP6_PARAM_PROB, 1215 ICMP6_PARAMPROB_HEADER, 1216 erroff + opt + 2 - opthead); 1217 return (-1); 1218 } 1219 *plenp = jumboplen; 1220 1221 break; 1222 default: /* unknown option */ 1223 if (hbhlen < IP6OPT_MINLEN) { 1224 IP6STAT_INC(ip6s_toosmall); 1225 goto bad; 1226 } 1227 optlen = ip6_unknown_opt(opt, m, 1228 erroff + opt - opthead); 1229 if (optlen == -1) 1230 return (-1); 1231 optlen += 2; 1232 break; 1233 } 1234 } 1235 1236 return (0); 1237 1238 bad: 1239 m_freem(m); 1240 return (-1); 1241 } 1242 1243 /* 1244 * Unknown option processing. 1245 * The third argument `off' is the offset from the IPv6 header to the option, 1246 * which is necessary if the IPv6 header the and option header and IPv6 header 1247 * is not contiguous in order to return an ICMPv6 error. 1248 */ 1249 int 1250 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off) 1251 { 1252 struct ip6_hdr *ip6; 1253 1254 switch (IP6OPT_TYPE(*optp)) { 1255 case IP6OPT_TYPE_SKIP: /* ignore the option */ 1256 return ((int)*(optp + 1)); 1257 case IP6OPT_TYPE_DISCARD: /* silently discard */ 1258 m_freem(m); 1259 return (-1); 1260 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 1261 IP6STAT_INC(ip6s_badoptions); 1262 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 1263 return (-1); 1264 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 1265 IP6STAT_INC(ip6s_badoptions); 1266 ip6 = mtod(m, struct ip6_hdr *); 1267 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 1268 (m->m_flags & (M_BCAST|M_MCAST))) 1269 m_freem(m); 1270 else 1271 icmp6_error(m, ICMP6_PARAM_PROB, 1272 ICMP6_PARAMPROB_OPTION, off); 1273 return (-1); 1274 } 1275 1276 m_freem(m); /* XXX: NOTREACHED */ 1277 return (-1); 1278 } 1279 1280 /* 1281 * Create the "control" list for this pcb. 1282 * These functions will not modify mbuf chain at all. 1283 * 1284 * With KAME mbuf chain restriction: 1285 * The routine will be called from upper layer handlers like tcp6_input(). 1286 * Thus the routine assumes that the caller (tcp6_input) have already 1287 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the 1288 * very first mbuf on the mbuf chain. 1289 * 1290 * ip6_savecontrol_v4 will handle those options that are possible to be 1291 * set on a v4-mapped socket. 1292 * ip6_savecontrol will directly call ip6_savecontrol_v4 to handle those 1293 * options and handle the v6-only ones itself. 1294 */ 1295 struct mbuf ** 1296 ip6_savecontrol_v4(struct inpcb *inp, struct mbuf *m, struct mbuf **mp, 1297 int *v4only) 1298 { 1299 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1300 1301 #ifdef SO_TIMESTAMP 1302 if ((inp->inp_socket->so_options & SO_TIMESTAMP) != 0) { 1303 struct timeval tv; 1304 1305 microtime(&tv); 1306 *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv), 1307 SCM_TIMESTAMP, SOL_SOCKET); 1308 if (*mp) 1309 mp = &(*mp)->m_next; 1310 } 1311 #endif 1312 1313 #define IS2292(inp, x, y) (((inp)->inp_flags & IN6P_RFC2292) ? (x) : (y)) 1314 /* RFC 2292 sec. 5 */ 1315 if ((inp->inp_flags & IN6P_PKTINFO) != 0) { 1316 struct in6_pktinfo pi6; 1317 1318 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1319 #ifdef INET 1320 struct ip *ip; 1321 1322 ip = mtod(m, struct ip *); 1323 pi6.ipi6_addr.s6_addr32[0] = 0; 1324 pi6.ipi6_addr.s6_addr32[1] = 0; 1325 pi6.ipi6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP; 1326 pi6.ipi6_addr.s6_addr32[3] = ip->ip_dst.s_addr; 1327 #else 1328 /* We won't hit this code */ 1329 bzero(&pi6.ipi6_addr, sizeof(struct in6_addr)); 1330 #endif 1331 } else { 1332 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr)); 1333 in6_clearscope(&pi6.ipi6_addr); /* XXX */ 1334 } 1335 pi6.ipi6_ifindex = 1336 (m && m->m_pkthdr.rcvif) ? m->m_pkthdr.rcvif->if_index : 0; 1337 1338 *mp = sbcreatecontrol((caddr_t) &pi6, 1339 sizeof(struct in6_pktinfo), 1340 IS2292(inp, IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6); 1341 if (*mp) 1342 mp = &(*mp)->m_next; 1343 } 1344 1345 if ((inp->inp_flags & IN6P_HOPLIMIT) != 0) { 1346 int hlim; 1347 1348 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1349 #ifdef INET 1350 struct ip *ip; 1351 1352 ip = mtod(m, struct ip *); 1353 hlim = ip->ip_ttl; 1354 #else 1355 /* We won't hit this code */ 1356 hlim = 0; 1357 #endif 1358 } else { 1359 hlim = ip6->ip6_hlim & 0xff; 1360 } 1361 *mp = sbcreatecontrol((caddr_t) &hlim, sizeof(int), 1362 IS2292(inp, IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), 1363 IPPROTO_IPV6); 1364 if (*mp) 1365 mp = &(*mp)->m_next; 1366 } 1367 1368 if ((inp->inp_flags & IN6P_TCLASS) != 0) { 1369 int tclass; 1370 1371 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1372 #ifdef INET 1373 struct ip *ip; 1374 1375 ip = mtod(m, struct ip *); 1376 tclass = ip->ip_tos; 1377 #else 1378 /* We won't hit this code */ 1379 tclass = 0; 1380 #endif 1381 } else { 1382 u_int32_t flowinfo; 1383 1384 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK); 1385 flowinfo >>= 20; 1386 tclass = flowinfo & 0xff; 1387 } 1388 *mp = sbcreatecontrol((caddr_t) &tclass, sizeof(int), 1389 IPV6_TCLASS, IPPROTO_IPV6); 1390 if (*mp) 1391 mp = &(*mp)->m_next; 1392 } 1393 1394 if (v4only != NULL) { 1395 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1396 *v4only = 1; 1397 } else { 1398 *v4only = 0; 1399 } 1400 } 1401 1402 return (mp); 1403 } 1404 1405 void 1406 ip6_savecontrol(struct inpcb *in6p, struct mbuf *m, struct mbuf **mp) 1407 { 1408 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1409 int v4only = 0; 1410 1411 mp = ip6_savecontrol_v4(in6p, m, mp, &v4only); 1412 if (v4only) 1413 return; 1414 1415 /* 1416 * IPV6_HOPOPTS socket option. Recall that we required super-user 1417 * privilege for the option (see ip6_ctloutput), but it might be too 1418 * strict, since there might be some hop-by-hop options which can be 1419 * returned to normal user. 1420 * See also RFC 2292 section 6 (or RFC 3542 section 8). 1421 */ 1422 if ((in6p->inp_flags & IN6P_HOPOPTS) != 0) { 1423 /* 1424 * Check if a hop-by-hop options header is contatined in the 1425 * received packet, and if so, store the options as ancillary 1426 * data. Note that a hop-by-hop options header must be 1427 * just after the IPv6 header, which is assured through the 1428 * IPv6 input processing. 1429 */ 1430 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 1431 struct ip6_hbh *hbh; 1432 int hbhlen = 0; 1433 #ifdef PULLDOWN_TEST 1434 struct mbuf *ext; 1435 #endif 1436 1437 #ifndef PULLDOWN_TEST 1438 hbh = (struct ip6_hbh *)(ip6 + 1); 1439 hbhlen = (hbh->ip6h_len + 1) << 3; 1440 #else 1441 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr), 1442 ip6->ip6_nxt); 1443 if (ext == NULL) { 1444 IP6STAT_INC(ip6s_tooshort); 1445 return; 1446 } 1447 hbh = mtod(ext, struct ip6_hbh *); 1448 hbhlen = (hbh->ip6h_len + 1) << 3; 1449 if (hbhlen != ext->m_len) { 1450 m_freem(ext); 1451 IP6STAT_INC(ip6s_tooshort); 1452 return; 1453 } 1454 #endif 1455 1456 /* 1457 * XXX: We copy the whole header even if a 1458 * jumbo payload option is included, the option which 1459 * is to be removed before returning according to 1460 * RFC2292. 1461 * Note: this constraint is removed in RFC3542 1462 */ 1463 *mp = sbcreatecontrol((caddr_t)hbh, hbhlen, 1464 IS2292(in6p, IPV6_2292HOPOPTS, IPV6_HOPOPTS), 1465 IPPROTO_IPV6); 1466 if (*mp) 1467 mp = &(*mp)->m_next; 1468 #ifdef PULLDOWN_TEST 1469 m_freem(ext); 1470 #endif 1471 } 1472 } 1473 1474 if ((in6p->inp_flags & (IN6P_RTHDR | IN6P_DSTOPTS)) != 0) { 1475 int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr); 1476 1477 /* 1478 * Search for destination options headers or routing 1479 * header(s) through the header chain, and stores each 1480 * header as ancillary data. 1481 * Note that the order of the headers remains in 1482 * the chain of ancillary data. 1483 */ 1484 while (1) { /* is explicit loop prevention necessary? */ 1485 struct ip6_ext *ip6e = NULL; 1486 int elen; 1487 #ifdef PULLDOWN_TEST 1488 struct mbuf *ext = NULL; 1489 #endif 1490 1491 /* 1492 * if it is not an extension header, don't try to 1493 * pull it from the chain. 1494 */ 1495 switch (nxt) { 1496 case IPPROTO_DSTOPTS: 1497 case IPPROTO_ROUTING: 1498 case IPPROTO_HOPOPTS: 1499 case IPPROTO_AH: /* is it possible? */ 1500 break; 1501 default: 1502 goto loopend; 1503 } 1504 1505 #ifndef PULLDOWN_TEST 1506 if (off + sizeof(*ip6e) > m->m_len) 1507 goto loopend; 1508 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off); 1509 if (nxt == IPPROTO_AH) 1510 elen = (ip6e->ip6e_len + 2) << 2; 1511 else 1512 elen = (ip6e->ip6e_len + 1) << 3; 1513 if (off + elen > m->m_len) 1514 goto loopend; 1515 #else 1516 ext = ip6_pullexthdr(m, off, nxt); 1517 if (ext == NULL) { 1518 IP6STAT_INC(ip6s_tooshort); 1519 return; 1520 } 1521 ip6e = mtod(ext, struct ip6_ext *); 1522 if (nxt == IPPROTO_AH) 1523 elen = (ip6e->ip6e_len + 2) << 2; 1524 else 1525 elen = (ip6e->ip6e_len + 1) << 3; 1526 if (elen != ext->m_len) { 1527 m_freem(ext); 1528 IP6STAT_INC(ip6s_tooshort); 1529 return; 1530 } 1531 #endif 1532 1533 switch (nxt) { 1534 case IPPROTO_DSTOPTS: 1535 if (!(in6p->inp_flags & IN6P_DSTOPTS)) 1536 break; 1537 1538 *mp = sbcreatecontrol((caddr_t)ip6e, elen, 1539 IS2292(in6p, 1540 IPV6_2292DSTOPTS, IPV6_DSTOPTS), 1541 IPPROTO_IPV6); 1542 if (*mp) 1543 mp = &(*mp)->m_next; 1544 break; 1545 case IPPROTO_ROUTING: 1546 if (!(in6p->inp_flags & IN6P_RTHDR)) 1547 break; 1548 1549 *mp = sbcreatecontrol((caddr_t)ip6e, elen, 1550 IS2292(in6p, IPV6_2292RTHDR, IPV6_RTHDR), 1551 IPPROTO_IPV6); 1552 if (*mp) 1553 mp = &(*mp)->m_next; 1554 break; 1555 case IPPROTO_HOPOPTS: 1556 case IPPROTO_AH: /* is it possible? */ 1557 break; 1558 1559 default: 1560 /* 1561 * other cases have been filtered in the above. 1562 * none will visit this case. here we supply 1563 * the code just in case (nxt overwritten or 1564 * other cases). 1565 */ 1566 #ifdef PULLDOWN_TEST 1567 m_freem(ext); 1568 #endif 1569 goto loopend; 1570 1571 } 1572 1573 /* proceed with the next header. */ 1574 off += elen; 1575 nxt = ip6e->ip6e_nxt; 1576 ip6e = NULL; 1577 #ifdef PULLDOWN_TEST 1578 m_freem(ext); 1579 ext = NULL; 1580 #endif 1581 } 1582 loopend: 1583 ; 1584 } 1585 } 1586 #undef IS2292 1587 1588 void 1589 ip6_notify_pmtu(struct inpcb *in6p, struct sockaddr_in6 *dst, u_int32_t *mtu) 1590 { 1591 struct socket *so; 1592 struct mbuf *m_mtu; 1593 struct ip6_mtuinfo mtuctl; 1594 1595 so = in6p->inp_socket; 1596 1597 if (mtu == NULL) 1598 return; 1599 1600 #ifdef DIAGNOSTIC 1601 if (so == NULL) /* I believe this is impossible */ 1602 panic("ip6_notify_pmtu: socket is NULL"); 1603 #endif 1604 1605 bzero(&mtuctl, sizeof(mtuctl)); /* zero-clear for safety */ 1606 mtuctl.ip6m_mtu = *mtu; 1607 mtuctl.ip6m_addr = *dst; 1608 if (sa6_recoverscope(&mtuctl.ip6m_addr)) 1609 return; 1610 1611 if ((m_mtu = sbcreatecontrol((caddr_t)&mtuctl, sizeof(mtuctl), 1612 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL) 1613 return; 1614 1615 if (sbappendaddr(&so->so_rcv, (struct sockaddr *)dst, NULL, m_mtu) 1616 == 0) { 1617 m_freem(m_mtu); 1618 /* XXX: should count statistics */ 1619 } else 1620 sorwakeup(so); 1621 1622 return; 1623 } 1624 1625 #ifdef PULLDOWN_TEST 1626 /* 1627 * pull single extension header from mbuf chain. returns single mbuf that 1628 * contains the result, or NULL on error. 1629 */ 1630 static struct mbuf * 1631 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt) 1632 { 1633 struct ip6_ext ip6e; 1634 size_t elen; 1635 struct mbuf *n; 1636 1637 #ifdef DIAGNOSTIC 1638 switch (nxt) { 1639 case IPPROTO_DSTOPTS: 1640 case IPPROTO_ROUTING: 1641 case IPPROTO_HOPOPTS: 1642 case IPPROTO_AH: /* is it possible? */ 1643 break; 1644 default: 1645 printf("ip6_pullexthdr: invalid nxt=%d\n", nxt); 1646 } 1647 #endif 1648 1649 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1650 if (nxt == IPPROTO_AH) 1651 elen = (ip6e.ip6e_len + 2) << 2; 1652 else 1653 elen = (ip6e.ip6e_len + 1) << 3; 1654 1655 if (elen > MLEN) 1656 n = m_getcl(M_NOWAIT, MT_DATA, 0); 1657 else 1658 n = m_get(M_NOWAIT, MT_DATA); 1659 if (n == NULL) 1660 return NULL; 1661 1662 m_copydata(m, off, elen, mtod(n, caddr_t)); 1663 n->m_len = elen; 1664 return n; 1665 } 1666 #endif 1667 1668 /* 1669 * Get pointer to the previous header followed by the header 1670 * currently processed. 1671 * XXX: This function supposes that 1672 * M includes all headers, 1673 * the next header field and the header length field of each header 1674 * are valid, and 1675 * the sum of each header length equals to OFF. 1676 * Because of these assumptions, this function must be called very 1677 * carefully. Moreover, it will not be used in the near future when 1678 * we develop `neater' mechanism to process extension headers. 1679 */ 1680 char * 1681 ip6_get_prevhdr(struct mbuf *m, int off) 1682 { 1683 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1684 1685 if (off == sizeof(struct ip6_hdr)) 1686 return (&ip6->ip6_nxt); 1687 else { 1688 int len, nxt; 1689 struct ip6_ext *ip6e = NULL; 1690 1691 nxt = ip6->ip6_nxt; 1692 len = sizeof(struct ip6_hdr); 1693 while (len < off) { 1694 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len); 1695 1696 switch (nxt) { 1697 case IPPROTO_FRAGMENT: 1698 len += sizeof(struct ip6_frag); 1699 break; 1700 case IPPROTO_AH: 1701 len += (ip6e->ip6e_len + 2) << 2; 1702 break; 1703 default: 1704 len += (ip6e->ip6e_len + 1) << 3; 1705 break; 1706 } 1707 nxt = ip6e->ip6e_nxt; 1708 } 1709 if (ip6e) 1710 return (&ip6e->ip6e_nxt); 1711 else 1712 return NULL; 1713 } 1714 } 1715 1716 /* 1717 * get next header offset. m will be retained. 1718 */ 1719 int 1720 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp) 1721 { 1722 struct ip6_hdr ip6; 1723 struct ip6_ext ip6e; 1724 struct ip6_frag fh; 1725 1726 /* just in case */ 1727 if (m == NULL) 1728 panic("ip6_nexthdr: m == NULL"); 1729 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off) 1730 return -1; 1731 1732 switch (proto) { 1733 case IPPROTO_IPV6: 1734 if (m->m_pkthdr.len < off + sizeof(ip6)) 1735 return -1; 1736 m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6); 1737 if (nxtp) 1738 *nxtp = ip6.ip6_nxt; 1739 off += sizeof(ip6); 1740 return off; 1741 1742 case IPPROTO_FRAGMENT: 1743 /* 1744 * terminate parsing if it is not the first fragment, 1745 * it does not make sense to parse through it. 1746 */ 1747 if (m->m_pkthdr.len < off + sizeof(fh)) 1748 return -1; 1749 m_copydata(m, off, sizeof(fh), (caddr_t)&fh); 1750 /* IP6F_OFF_MASK = 0xfff8(BigEndian), 0xf8ff(LittleEndian) */ 1751 if (fh.ip6f_offlg & IP6F_OFF_MASK) 1752 return -1; 1753 if (nxtp) 1754 *nxtp = fh.ip6f_nxt; 1755 off += sizeof(struct ip6_frag); 1756 return off; 1757 1758 case IPPROTO_AH: 1759 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1760 return -1; 1761 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1762 if (nxtp) 1763 *nxtp = ip6e.ip6e_nxt; 1764 off += (ip6e.ip6e_len + 2) << 2; 1765 return off; 1766 1767 case IPPROTO_HOPOPTS: 1768 case IPPROTO_ROUTING: 1769 case IPPROTO_DSTOPTS: 1770 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1771 return -1; 1772 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1773 if (nxtp) 1774 *nxtp = ip6e.ip6e_nxt; 1775 off += (ip6e.ip6e_len + 1) << 3; 1776 return off; 1777 1778 case IPPROTO_NONE: 1779 case IPPROTO_ESP: 1780 case IPPROTO_IPCOMP: 1781 /* give up */ 1782 return -1; 1783 1784 default: 1785 return -1; 1786 } 1787 1788 return -1; 1789 } 1790 1791 /* 1792 * get offset for the last header in the chain. m will be kept untainted. 1793 */ 1794 int 1795 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp) 1796 { 1797 int newoff; 1798 int nxt; 1799 1800 if (!nxtp) { 1801 nxt = -1; 1802 nxtp = &nxt; 1803 } 1804 while (1) { 1805 newoff = ip6_nexthdr(m, off, proto, nxtp); 1806 if (newoff < 0) 1807 return off; 1808 else if (newoff < off) 1809 return -1; /* invalid */ 1810 else if (newoff == off) 1811 return newoff; 1812 1813 off = newoff; 1814 proto = *nxtp; 1815 } 1816 } 1817 1818 static struct ip6aux * 1819 ip6_addaux(struct mbuf *m) 1820 { 1821 struct m_tag *mtag; 1822 1823 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL); 1824 if (!mtag) { 1825 mtag = m_tag_get(PACKET_TAG_IPV6_INPUT, sizeof(struct ip6aux), 1826 M_NOWAIT); 1827 if (mtag) { 1828 m_tag_prepend(m, mtag); 1829 bzero(mtag + 1, sizeof(struct ip6aux)); 1830 } 1831 } 1832 return mtag ? (struct ip6aux *)(mtag + 1) : NULL; 1833 } 1834 1835 static struct ip6aux * 1836 ip6_findaux(struct mbuf *m) 1837 { 1838 struct m_tag *mtag; 1839 1840 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL); 1841 return mtag ? (struct ip6aux *)(mtag + 1) : NULL; 1842 } 1843 1844 static void 1845 ip6_delaux(struct mbuf *m) 1846 { 1847 struct m_tag *mtag; 1848 1849 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL); 1850 if (mtag) 1851 m_tag_delete(m, mtag); 1852 } 1853 1854 /* 1855 * System control for IP6 1856 */ 1857 1858 u_char inet6ctlerrmap[PRC_NCMDS] = { 1859 0, 0, 0, 0, 1860 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 1861 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 1862 EMSGSIZE, EHOSTUNREACH, 0, 0, 1863 0, 0, 0, 0, 1864 ENOPROTOOPT 1865 }; 1866