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 protosw *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 pr = pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 198 if (pr == NULL) 199 panic("ip6_init"); 200 201 /* Initialize the entire ip6_protox[] array to IPPROTO_RAW. */ 202 for (i = 0; i < IPPROTO_MAX; i++) 203 ip6_protox[i] = pr - inet6sw; 204 /* 205 * Cycle through IP protocols and put them into the appropriate place 206 * in ip6_protox[]. 207 */ 208 for (pr = inet6domain.dom_protosw; 209 pr < inet6domain.dom_protoswNPROTOSW; pr++) 210 if (pr->pr_domain->dom_family == PF_INET6 && 211 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) { 212 /* Be careful to only index valid IP protocols. */ 213 if (pr->pr_protocol < IPPROTO_MAX) 214 ip6_protox[pr->pr_protocol] = pr - inet6sw; 215 } 216 217 netisr_register(&ip6_nh); 218 } 219 220 /* 221 * The protocol to be inserted into ip6_protox[] must be already registered 222 * in inet6sw[], either statically or through pf_proto_register(). 223 */ 224 int 225 ip6proto_register(short ip6proto) 226 { 227 struct protosw *pr; 228 229 /* Sanity checks. */ 230 if (ip6proto <= 0 || ip6proto >= IPPROTO_MAX) 231 return (EPROTONOSUPPORT); 232 233 /* 234 * The protocol slot must not be occupied by another protocol 235 * already. An index pointing to IPPROTO_RAW is unused. 236 */ 237 pr = pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 238 if (pr == NULL) 239 return (EPFNOSUPPORT); 240 if (ip6_protox[ip6proto] != pr - inet6sw) /* IPPROTO_RAW */ 241 return (EEXIST); 242 243 /* 244 * Find the protocol position in inet6sw[] and set the index. 245 */ 246 for (pr = inet6domain.dom_protosw; 247 pr < inet6domain.dom_protoswNPROTOSW; pr++) { 248 if (pr->pr_domain->dom_family == PF_INET6 && 249 pr->pr_protocol && pr->pr_protocol == ip6proto) { 250 ip6_protox[pr->pr_protocol] = pr - inet6sw; 251 return (0); 252 } 253 } 254 return (EPROTONOSUPPORT); 255 } 256 257 int 258 ip6proto_unregister(short ip6proto) 259 { 260 struct protosw *pr; 261 262 /* Sanity checks. */ 263 if (ip6proto <= 0 || ip6proto >= IPPROTO_MAX) 264 return (EPROTONOSUPPORT); 265 266 /* Check if the protocol was indeed registered. */ 267 pr = pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 268 if (pr == NULL) 269 return (EPFNOSUPPORT); 270 if (ip6_protox[ip6proto] == pr - inet6sw) /* IPPROTO_RAW */ 271 return (ENOENT); 272 273 /* Reset the protocol slot to IPPROTO_RAW. */ 274 ip6_protox[ip6proto] = pr - inet6sw; 275 return (0); 276 } 277 278 #ifdef VIMAGE 279 void 280 ip6_destroy() 281 { 282 int i; 283 284 if ((i = pfil_head_unregister(&V_inet6_pfil_hook)) != 0) 285 printf("%s: WARNING: unable to unregister pfil hook, " 286 "error %d\n", __func__, i); 287 hashdestroy(V_in6_ifaddrhashtbl, M_IFADDR, V_in6_ifaddrhmask); 288 nd6_destroy(); 289 callout_drain(&V_in6_tmpaddrtimer_ch); 290 } 291 #endif 292 293 static int 294 ip6_init2_vnet(const void *unused __unused) 295 { 296 297 /* nd6_timer_init */ 298 callout_init(&V_nd6_timer_ch, 0); 299 callout_reset(&V_nd6_timer_ch, hz, nd6_timer, curvnet); 300 301 /* timer for regeneranation of temporary addresses randomize ID */ 302 callout_init(&V_in6_tmpaddrtimer_ch, 0); 303 callout_reset(&V_in6_tmpaddrtimer_ch, 304 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor - 305 V_ip6_temp_regen_advance) * hz, 306 in6_tmpaddrtimer, curvnet); 307 308 return (0); 309 } 310 311 static void 312 ip6_init2(void *dummy) 313 { 314 315 ip6_init2_vnet(NULL); 316 } 317 318 /* cheat */ 319 /* This must be after route_init(), which is now SI_ORDER_THIRD */ 320 SYSINIT(netinet6init2, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ip6_init2, NULL); 321 322 static int 323 ip6_input_hbh(struct mbuf *m, uint32_t *plen, uint32_t *rtalert, int *off, 324 int *nxt, int *ours) 325 { 326 struct ip6_hdr *ip6; 327 struct ip6_hbh *hbh; 328 329 if (ip6_hopopts_input(plen, rtalert, &m, off)) { 330 #if 0 /*touches NULL pointer*/ 331 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 332 #endif 333 goto out; /* m have already been freed */ 334 } 335 336 /* adjust pointer */ 337 ip6 = mtod(m, struct ip6_hdr *); 338 339 /* 340 * if the payload length field is 0 and the next header field 341 * indicates Hop-by-Hop Options header, then a Jumbo Payload 342 * option MUST be included. 343 */ 344 if (ip6->ip6_plen == 0 && *plen == 0) { 345 /* 346 * Note that if a valid jumbo payload option is 347 * contained, ip6_hopopts_input() must set a valid 348 * (non-zero) payload length to the variable plen. 349 */ 350 IP6STAT_INC(ip6s_badoptions); 351 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 352 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 353 icmp6_error(m, ICMP6_PARAM_PROB, 354 ICMP6_PARAMPROB_HEADER, 355 (caddr_t)&ip6->ip6_plen - (caddr_t)ip6); 356 goto out; 357 } 358 #ifndef PULLDOWN_TEST 359 /* ip6_hopopts_input() ensures that mbuf is contiguous */ 360 hbh = (struct ip6_hbh *)(ip6 + 1); 361 #else 362 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 363 sizeof(struct ip6_hbh)); 364 if (hbh == NULL) { 365 IP6STAT_INC(ip6s_tooshort); 366 goto out; 367 } 368 #endif 369 *nxt = hbh->ip6h_nxt; 370 371 /* 372 * If we are acting as a router and the packet contains a 373 * router alert option, see if we know the option value. 374 * Currently, we only support the option value for MLD, in which 375 * case we should pass the packet to the multicast routing 376 * daemon. 377 */ 378 if (*rtalert != ~0) { 379 switch (*rtalert) { 380 case IP6OPT_RTALERT_MLD: 381 if (V_ip6_forwarding) 382 *ours = 1; 383 break; 384 default: 385 /* 386 * RFC2711 requires unrecognized values must be 387 * silently ignored. 388 */ 389 break; 390 } 391 } 392 393 return (0); 394 395 out: 396 return (1); 397 } 398 399 void 400 ip6_input(struct mbuf *m) 401 { 402 struct ip6_hdr *ip6; 403 int off = sizeof(struct ip6_hdr), nest; 404 u_int32_t plen; 405 u_int32_t rtalert = ~0; 406 int nxt, ours = 0; 407 struct ifnet *deliverifp = NULL, *ifp = NULL; 408 struct in6_addr odst; 409 struct route_in6 rin6; 410 int srcrt = 0; 411 struct llentry *lle = NULL; 412 struct sockaddr_in6 dst6, *dst; 413 414 bzero(&rin6, sizeof(struct route_in6)); 415 #ifdef IPSEC 416 /* 417 * should the inner packet be considered authentic? 418 * see comment in ah4_input(). 419 * NB: m cannot be NULL when passed to the input routine 420 */ 421 422 m->m_flags &= ~M_AUTHIPHDR; 423 m->m_flags &= ~M_AUTHIPDGM; 424 425 #endif /* IPSEC */ 426 427 /* 428 * make sure we don't have onion peering information into m_tag. 429 */ 430 ip6_delaux(m); 431 432 if (m->m_flags & M_FASTFWD_OURS) { 433 /* 434 * Firewall changed destination to local. 435 */ 436 m->m_flags &= ~M_FASTFWD_OURS; 437 ours = 1; 438 deliverifp = m->m_pkthdr.rcvif; 439 ip6 = mtod(m, struct ip6_hdr *); 440 goto hbhcheck; 441 } 442 443 /* 444 * mbuf statistics 445 */ 446 if (m->m_flags & M_EXT) { 447 if (m->m_next) 448 IP6STAT_INC(ip6s_mext2m); 449 else 450 IP6STAT_INC(ip6s_mext1); 451 } else { 452 if (m->m_next) { 453 if (m->m_flags & M_LOOP) { 454 IP6STAT_INC(ip6s_m2m[V_loif->if_index]); 455 } else if (m->m_pkthdr.rcvif->if_index < IP6S_M2MMAX) 456 IP6STAT_INC( 457 ip6s_m2m[m->m_pkthdr.rcvif->if_index]); 458 else 459 IP6STAT_INC(ip6s_m2m[0]); 460 } else 461 IP6STAT_INC(ip6s_m1); 462 } 463 464 /* drop the packet if IPv6 operation is disabled on the IF */ 465 if ((ND_IFINFO(m->m_pkthdr.rcvif)->flags & ND6_IFF_IFDISABLED)) { 466 m_freem(m); 467 return; 468 } 469 470 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive); 471 IP6STAT_INC(ip6s_total); 472 473 #ifndef PULLDOWN_TEST 474 /* 475 * L2 bridge code and some other code can return mbuf chain 476 * that does not conform to KAME requirement. too bad. 477 * XXX: fails to join if interface MTU > MCLBYTES. jumbogram? 478 */ 479 if (m && m->m_next != NULL && m->m_pkthdr.len < MCLBYTES) { 480 struct mbuf *n; 481 482 if (m->m_pkthdr.len > MHLEN) 483 n = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 484 else 485 n = m_gethdr(M_NOWAIT, MT_DATA); 486 if (n == NULL) { 487 m_freem(m); 488 return; /* ENOBUFS */ 489 } 490 491 m_move_pkthdr(n, m); 492 m_copydata(m, 0, n->m_pkthdr.len, mtod(n, caddr_t)); 493 n->m_len = n->m_pkthdr.len; 494 m_freem(m); 495 m = n; 496 } 497 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), /* nothing */); 498 #endif 499 500 if (m->m_len < sizeof(struct ip6_hdr)) { 501 struct ifnet *inifp; 502 inifp = m->m_pkthdr.rcvif; 503 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 504 IP6STAT_INC(ip6s_toosmall); 505 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 506 return; 507 } 508 } 509 510 ip6 = mtod(m, struct ip6_hdr *); 511 512 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 513 IP6STAT_INC(ip6s_badvers); 514 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 515 goto bad; 516 } 517 518 IP6STAT_INC(ip6s_nxthist[ip6->ip6_nxt]); 519 520 IP_PROBE(receive, NULL, NULL, ip6, m->m_pkthdr.rcvif, NULL, ip6); 521 522 /* 523 * Check against address spoofing/corruption. 524 */ 525 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) || 526 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) { 527 /* 528 * XXX: "badscope" is not very suitable for a multicast source. 529 */ 530 IP6STAT_INC(ip6s_badscope); 531 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 532 goto bad; 533 } 534 if (IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) && 535 !(m->m_flags & M_LOOP)) { 536 /* 537 * In this case, the packet should come from the loopback 538 * interface. However, we cannot just check the if_flags, 539 * because ip6_mloopback() passes the "actual" interface 540 * as the outgoing/incoming interface. 541 */ 542 IP6STAT_INC(ip6s_badscope); 543 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 544 goto bad; 545 } 546 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && 547 IPV6_ADDR_MC_SCOPE(&ip6->ip6_dst) == 0) { 548 /* 549 * RFC4291 2.7: 550 * Nodes must not originate a packet to a multicast address 551 * whose scop field contains the reserved value 0; if such 552 * a packet is received, it must be silently dropped. 553 */ 554 IP6STAT_INC(ip6s_badscope); 555 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 556 goto bad; 557 } 558 #ifdef ALTQ 559 if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) { 560 /* packet is dropped by traffic conditioner */ 561 return; 562 } 563 #endif 564 /* 565 * The following check is not documented in specs. A malicious 566 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack 567 * and bypass security checks (act as if it was from 127.0.0.1 by using 568 * IPv6 src ::ffff:127.0.0.1). Be cautious. 569 * 570 * This check chokes if we are in an SIIT cloud. As none of BSDs 571 * support IPv4-less kernel compilation, we cannot support SIIT 572 * environment at all. So, it makes more sense for us to reject any 573 * malicious packets for non-SIIT environment, than try to do a 574 * partial support for SIIT environment. 575 */ 576 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 577 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 578 IP6STAT_INC(ip6s_badscope); 579 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 580 goto bad; 581 } 582 #if 0 583 /* 584 * Reject packets with IPv4 compatible addresses (auto tunnel). 585 * 586 * The code forbids auto tunnel relay case in RFC1933 (the check is 587 * stronger than RFC1933). We may want to re-enable it if mech-xx 588 * is revised to forbid relaying case. 589 */ 590 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) || 591 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) { 592 IP6STAT_INC(ip6s_badscope); 593 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 594 goto bad; 595 } 596 #endif 597 #ifdef IPSEC 598 /* 599 * Bypass packet filtering for packets previously handled by IPsec. 600 */ 601 if (ip6_ipsec_filtertunnel(m)) 602 goto passin; 603 #endif /* IPSEC */ 604 605 /* 606 * Run through list of hooks for input packets. 607 * 608 * NB: Beware of the destination address changing 609 * (e.g. by NAT rewriting). When this happens, 610 * tell ip6_forward to do the right thing. 611 */ 612 odst = ip6->ip6_dst; 613 614 /* Jump over all PFIL processing if hooks are not active. */ 615 if (!PFIL_HOOKED(&V_inet6_pfil_hook)) 616 goto passin; 617 618 if (pfil_run_hooks(&V_inet6_pfil_hook, &m, 619 m->m_pkthdr.rcvif, PFIL_IN, NULL)) 620 return; 621 if (m == NULL) /* consumed by filter */ 622 return; 623 ip6 = mtod(m, struct ip6_hdr *); 624 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst); 625 626 if (m->m_flags & M_FASTFWD_OURS) { 627 m->m_flags &= ~M_FASTFWD_OURS; 628 ours = 1; 629 deliverifp = m->m_pkthdr.rcvif; 630 goto hbhcheck; 631 } 632 if ((m->m_flags & M_IP6_NEXTHOP) && 633 m_tag_find(m, PACKET_TAG_IPFORWARD, NULL) != NULL) { 634 /* 635 * Directly ship the packet on. This allows forwarding 636 * packets originally destined to us to some other directly 637 * connected host. 638 */ 639 ip6_forward(m, 1); 640 goto out; 641 } 642 643 passin: 644 /* 645 * Disambiguate address scope zones (if there is ambiguity). 646 * We first make sure that the original source or destination address 647 * is not in our internal form for scoped addresses. Such addresses 648 * are not necessarily invalid spec-wise, but we cannot accept them due 649 * to the usage conflict. 650 * in6_setscope() then also checks and rejects the cases where src or 651 * dst are the loopback address and the receiving interface 652 * is not loopback. 653 */ 654 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) { 655 IP6STAT_INC(ip6s_badscope); /* XXX */ 656 goto bad; 657 } 658 if (in6_setscope(&ip6->ip6_src, m->m_pkthdr.rcvif, NULL) || 659 in6_setscope(&ip6->ip6_dst, m->m_pkthdr.rcvif, NULL)) { 660 IP6STAT_INC(ip6s_badscope); 661 goto bad; 662 } 663 664 /* 665 * Multicast check. Assume packet is for us to avoid 666 * prematurely taking locks. 667 */ 668 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 669 ours = 1; 670 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast); 671 deliverifp = m->m_pkthdr.rcvif; 672 goto hbhcheck; 673 } 674 675 /* 676 * Unicast check 677 */ 678 679 bzero(&dst6, sizeof(dst6)); 680 dst6.sin6_family = AF_INET6; 681 dst6.sin6_len = sizeof(struct sockaddr_in6); 682 dst6.sin6_addr = ip6->ip6_dst; 683 ifp = m->m_pkthdr.rcvif; 684 IF_AFDATA_RLOCK(ifp); 685 lle = lla_lookup(LLTABLE6(ifp), 0, 686 (struct sockaddr *)&dst6); 687 IF_AFDATA_RUNLOCK(ifp); 688 if ((lle != NULL) && (lle->la_flags & LLE_IFADDR)) { 689 struct ifaddr *ifa; 690 struct in6_ifaddr *ia6; 691 int bad; 692 693 bad = 1; 694 IF_ADDR_RLOCK(ifp); 695 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 696 if (ifa->ifa_addr->sa_family != dst6.sin6_family) 697 continue; 698 if (sa_equal(&dst6, ifa->ifa_addr)) 699 break; 700 } 701 KASSERT(ifa != NULL, ("%s: ifa not found for lle %p", 702 __func__, lle)); 703 704 ia6 = (struct in6_ifaddr *)ifa; 705 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) { 706 /* Count the packet in the ip address stats */ 707 counter_u64_add(ia6->ia_ifa.ifa_ipackets, 1); 708 counter_u64_add(ia6->ia_ifa.ifa_ibytes, 709 m->m_pkthdr.len); 710 711 /* 712 * record address information into m_tag. 713 */ 714 (void)ip6_setdstifaddr(m, ia6); 715 716 bad = 0; 717 } else { 718 char ip6bufs[INET6_ADDRSTRLEN]; 719 char ip6bufd[INET6_ADDRSTRLEN]; 720 /* address is not ready, so discard the packet. */ 721 nd6log((LOG_INFO, 722 "ip6_input: packet to an unready address %s->%s\n", 723 ip6_sprintf(ip6bufs, &ip6->ip6_src), 724 ip6_sprintf(ip6bufd, &ip6->ip6_dst))); 725 } 726 IF_ADDR_RUNLOCK(ifp); 727 LLE_RUNLOCK(lle); 728 if (bad) 729 goto bad; 730 else { 731 ours = 1; 732 deliverifp = ifp; 733 goto hbhcheck; 734 } 735 } 736 if (lle != NULL) 737 LLE_RUNLOCK(lle); 738 739 dst = &rin6.ro_dst; 740 dst->sin6_len = sizeof(struct sockaddr_in6); 741 dst->sin6_family = AF_INET6; 742 dst->sin6_addr = ip6->ip6_dst; 743 rin6.ro_rt = in6_rtalloc1((struct sockaddr *)dst, 0, 0, M_GETFIB(m)); 744 if (rin6.ro_rt) 745 RT_UNLOCK(rin6.ro_rt); 746 747 #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key)) 748 749 /* 750 * Accept the packet if the forwarding interface to the destination 751 * according to the routing table is the loopback interface, 752 * unless the associated route has a gateway. 753 * Note that this approach causes to accept a packet if there is a 754 * route to the loopback interface for the destination of the packet. 755 * But we think it's even useful in some situations, e.g. when using 756 * a special daemon which wants to intercept the packet. 757 * 758 * XXX: some OSes automatically make a cloned route for the destination 759 * of an outgoing packet. If the outgoing interface of the packet 760 * is a loopback one, the kernel would consider the packet to be 761 * accepted, even if we have no such address assinged on the interface. 762 * We check the cloned flag of the route entry to reject such cases, 763 * assuming that route entries for our own addresses are not made by 764 * cloning (it should be true because in6_addloop explicitly installs 765 * the host route). However, we might have to do an explicit check 766 * while it would be less efficient. Or, should we rather install a 767 * reject route for such a case? 768 */ 769 if (rin6.ro_rt && 770 (rin6.ro_rt->rt_flags & 771 (RTF_HOST|RTF_GATEWAY)) == RTF_HOST && 772 #ifdef RTF_WASCLONED 773 !(rin6.ro_rt->rt_flags & RTF_WASCLONED) && 774 #endif 775 #ifdef RTF_CLONED 776 !(rin6.ro_rt->rt_flags & RTF_CLONED) && 777 #endif 778 #if 0 779 /* 780 * The check below is redundant since the comparison of 781 * the destination and the key of the rtentry has 782 * already done through looking up the routing table. 783 */ 784 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 785 &rt6_key(rin6.ro_rt)->sin6_addr) 786 #endif 787 rin6.ro_rt->rt_ifp->if_type == IFT_LOOP) { 788 int free_ia6 = 0; 789 struct in6_ifaddr *ia6; 790 791 /* 792 * found the loopback route to the interface address 793 */ 794 if (rin6.ro_rt->rt_gateway->sa_family == AF_LINK) { 795 struct sockaddr_in6 dest6; 796 797 bzero(&dest6, sizeof(dest6)); 798 dest6.sin6_family = AF_INET6; 799 dest6.sin6_len = sizeof(dest6); 800 dest6.sin6_addr = ip6->ip6_dst; 801 ia6 = (struct in6_ifaddr *) 802 ifa_ifwithaddr((struct sockaddr *)&dest6); 803 if (ia6 == NULL) 804 goto bad; 805 free_ia6 = 1; 806 } 807 else 808 ia6 = (struct in6_ifaddr *)rin6.ro_rt->rt_ifa; 809 810 /* 811 * record address information into m_tag. 812 */ 813 (void)ip6_setdstifaddr(m, ia6); 814 815 /* 816 * packets to a tentative, duplicated, or somehow invalid 817 * address must not be accepted. 818 */ 819 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) { 820 /* this address is ready */ 821 ours = 1; 822 deliverifp = ia6->ia_ifp; /* correct? */ 823 /* Count the packet in the ip address stats */ 824 counter_u64_add(ia6->ia_ifa.ifa_ipackets, 1); 825 counter_u64_add(ia6->ia_ifa.ifa_ibytes, 826 m->m_pkthdr.len); 827 if (free_ia6) 828 ifa_free(&ia6->ia_ifa); 829 goto hbhcheck; 830 } else { 831 char ip6bufs[INET6_ADDRSTRLEN]; 832 char ip6bufd[INET6_ADDRSTRLEN]; 833 /* address is not ready, so discard the packet. */ 834 nd6log((LOG_INFO, 835 "ip6_input: packet to an unready address %s->%s\n", 836 ip6_sprintf(ip6bufs, &ip6->ip6_src), 837 ip6_sprintf(ip6bufd, &ip6->ip6_dst))); 838 839 if (free_ia6) 840 ifa_free(&ia6->ia_ifa); 841 goto bad; 842 } 843 } 844 845 /* 846 * FAITH (Firewall Aided Internet Translator) 847 */ 848 if (V_ip6_keepfaith) { 849 if (rin6.ro_rt && rin6.ro_rt->rt_ifp && 850 rin6.ro_rt->rt_ifp->if_type == IFT_FAITH) { 851 /* XXX do we need more sanity checks? */ 852 ours = 1; 853 deliverifp = rin6.ro_rt->rt_ifp; /* faith */ 854 goto hbhcheck; 855 } 856 } 857 858 /* 859 * Now there is no reason to process the packet if it's not our own 860 * and we're not a router. 861 */ 862 if (!V_ip6_forwarding) { 863 IP6STAT_INC(ip6s_cantforward); 864 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 865 goto bad; 866 } 867 868 hbhcheck: 869 /* 870 * record address information into m_tag, if we don't have one yet. 871 * note that we are unable to record it, if the address is not listed 872 * as our interface address (e.g. multicast addresses, addresses 873 * within FAITH prefixes and such). 874 */ 875 if (deliverifp) { 876 struct in6_ifaddr *ia6; 877 878 if ((ia6 = ip6_getdstifaddr(m)) != NULL) { 879 ifa_free(&ia6->ia_ifa); 880 } else { 881 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 882 if (ia6) { 883 if (!ip6_setdstifaddr(m, ia6)) { 884 /* 885 * XXX maybe we should drop the packet here, 886 * as we could not provide enough information 887 * to the upper layers. 888 */ 889 } 890 ifa_free(&ia6->ia_ifa); 891 } 892 } 893 } 894 895 /* 896 * Process Hop-by-Hop options header if it's contained. 897 * m may be modified in ip6_hopopts_input(). 898 * If a JumboPayload option is included, plen will also be modified. 899 */ 900 plen = (u_int32_t)ntohs(ip6->ip6_plen); 901 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 902 int error; 903 904 error = ip6_input_hbh(m, &plen, &rtalert, &off, &nxt, &ours); 905 if (error != 0) 906 goto out; 907 } else 908 nxt = ip6->ip6_nxt; 909 910 /* 911 * Check that the amount of data in the buffers 912 * is as at least much as the IPv6 header would have us expect. 913 * Trim mbufs if longer than we expect. 914 * Drop packet if shorter than we expect. 915 */ 916 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 917 IP6STAT_INC(ip6s_tooshort); 918 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 919 goto bad; 920 } 921 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 922 if (m->m_len == m->m_pkthdr.len) { 923 m->m_len = sizeof(struct ip6_hdr) + plen; 924 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 925 } else 926 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 927 } 928 929 /* 930 * Forward if desirable. 931 */ 932 if (V_ip6_mrouter && 933 IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 934 /* 935 * If we are acting as a multicast router, all 936 * incoming multicast packets are passed to the 937 * kernel-level multicast forwarding function. 938 * The packet is returned (relatively) intact; if 939 * ip6_mforward() returns a non-zero value, the packet 940 * must be discarded, else it may be accepted below. 941 * 942 * XXX TODO: Check hlim and multicast scope here to avoid 943 * unnecessarily calling into ip6_mforward(). 944 */ 945 if (ip6_mforward && 946 ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) { 947 IP6STAT_INC(ip6s_cantforward); 948 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 949 goto bad; 950 } 951 } else if (!ours) { 952 ip6_forward(m, srcrt); 953 goto out; 954 } 955 956 ip6 = mtod(m, struct ip6_hdr *); 957 958 /* 959 * Malicious party may be able to use IPv4 mapped addr to confuse 960 * tcp/udp stack and bypass security checks (act as if it was from 961 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious. 962 * 963 * For SIIT end node behavior, you may want to disable the check. 964 * However, you will become vulnerable to attacks using IPv4 mapped 965 * source. 966 */ 967 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 968 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 969 IP6STAT_INC(ip6s_badscope); 970 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 971 goto bad; 972 } 973 974 /* 975 * Tell launch routine the next header 976 */ 977 IP6STAT_INC(ip6s_delivered); 978 in6_ifstat_inc(deliverifp, ifs6_in_deliver); 979 nest = 0; 980 981 while (nxt != IPPROTO_DONE) { 982 if (V_ip6_hdrnestlimit && (++nest > V_ip6_hdrnestlimit)) { 983 IP6STAT_INC(ip6s_toomanyhdr); 984 goto bad; 985 } 986 987 /* 988 * protection against faulty packet - there should be 989 * more sanity checks in header chain processing. 990 */ 991 if (m->m_pkthdr.len < off) { 992 IP6STAT_INC(ip6s_tooshort); 993 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 994 goto bad; 995 } 996 997 #ifdef IPSEC 998 /* 999 * enforce IPsec policy checking if we are seeing last header. 1000 * note that we do not visit this with protocols with pcb layer 1001 * code - like udp/tcp/raw ip. 1002 */ 1003 if (ip6_ipsec_input(m, nxt)) 1004 goto bad; 1005 #endif /* IPSEC */ 1006 1007 /* 1008 * Use mbuf flags to propagate Router Alert option to 1009 * ICMPv6 layer, as hop-by-hop options have been stripped. 1010 */ 1011 if (nxt == IPPROTO_ICMPV6 && rtalert != ~0) 1012 m->m_flags |= M_RTALERT_MLD; 1013 1014 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt); 1015 } 1016 goto out; 1017 bad: 1018 m_freem(m); 1019 out: 1020 if (rin6.ro_rt) 1021 RTFREE(rin6.ro_rt); 1022 } 1023 1024 /* 1025 * set/grab in6_ifaddr correspond to IPv6 destination address. 1026 * XXX backward compatibility wrapper 1027 * 1028 * XXXRW: We should bump the refcount on ia6 before sticking it in the m_tag, 1029 * and then bump it when the tag is copied, and release it when the tag is 1030 * freed. Unfortunately, m_tags don't support deep copies (yet), so instead 1031 * we just bump the ia refcount when we receive it. This should be fixed. 1032 */ 1033 static struct ip6aux * 1034 ip6_setdstifaddr(struct mbuf *m, struct in6_ifaddr *ia6) 1035 { 1036 struct ip6aux *ip6a; 1037 1038 ip6a = ip6_addaux(m); 1039 if (ip6a) 1040 ip6a->ip6a_dstia6 = ia6; 1041 return ip6a; /* NULL if failed to set */ 1042 } 1043 1044 struct in6_ifaddr * 1045 ip6_getdstifaddr(struct mbuf *m) 1046 { 1047 struct ip6aux *ip6a; 1048 struct in6_ifaddr *ia; 1049 1050 ip6a = ip6_findaux(m); 1051 if (ip6a) { 1052 ia = ip6a->ip6a_dstia6; 1053 ifa_ref(&ia->ia_ifa); 1054 return ia; 1055 } else 1056 return NULL; 1057 } 1058 1059 /* 1060 * Hop-by-Hop options header processing. If a valid jumbo payload option is 1061 * included, the real payload length will be stored in plenp. 1062 * 1063 * rtalertp - XXX: should be stored more smart way 1064 */ 1065 static int 1066 ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp, 1067 struct mbuf **mp, int *offp) 1068 { 1069 struct mbuf *m = *mp; 1070 int off = *offp, hbhlen; 1071 struct ip6_hbh *hbh; 1072 1073 /* validation of the length of the header */ 1074 #ifndef PULLDOWN_TEST 1075 IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1); 1076 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); 1077 hbhlen = (hbh->ip6h_len + 1) << 3; 1078 1079 IP6_EXTHDR_CHECK(m, off, hbhlen, -1); 1080 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); 1081 #else 1082 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, 1083 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh)); 1084 if (hbh == NULL) { 1085 IP6STAT_INC(ip6s_tooshort); 1086 return -1; 1087 } 1088 hbhlen = (hbh->ip6h_len + 1) << 3; 1089 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 1090 hbhlen); 1091 if (hbh == NULL) { 1092 IP6STAT_INC(ip6s_tooshort); 1093 return -1; 1094 } 1095 #endif 1096 off += hbhlen; 1097 hbhlen -= sizeof(struct ip6_hbh); 1098 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 1099 hbhlen, rtalertp, plenp) < 0) 1100 return (-1); 1101 1102 *offp = off; 1103 *mp = m; 1104 return (0); 1105 } 1106 1107 /* 1108 * Search header for all Hop-by-hop options and process each option. 1109 * This function is separate from ip6_hopopts_input() in order to 1110 * handle a case where the sending node itself process its hop-by-hop 1111 * options header. In such a case, the function is called from ip6_output(). 1112 * 1113 * The function assumes that hbh header is located right after the IPv6 header 1114 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to 1115 * opthead + hbhlen is located in contiguous memory region. 1116 */ 1117 int 1118 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen, 1119 u_int32_t *rtalertp, u_int32_t *plenp) 1120 { 1121 struct ip6_hdr *ip6; 1122 int optlen = 0; 1123 u_int8_t *opt = opthead; 1124 u_int16_t rtalert_val; 1125 u_int32_t jumboplen; 1126 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh); 1127 1128 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 1129 switch (*opt) { 1130 case IP6OPT_PAD1: 1131 optlen = 1; 1132 break; 1133 case IP6OPT_PADN: 1134 if (hbhlen < IP6OPT_MINLEN) { 1135 IP6STAT_INC(ip6s_toosmall); 1136 goto bad; 1137 } 1138 optlen = *(opt + 1) + 2; 1139 break; 1140 case IP6OPT_ROUTER_ALERT: 1141 /* XXX may need check for alignment */ 1142 if (hbhlen < IP6OPT_RTALERT_LEN) { 1143 IP6STAT_INC(ip6s_toosmall); 1144 goto bad; 1145 } 1146 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) { 1147 /* XXX stat */ 1148 icmp6_error(m, ICMP6_PARAM_PROB, 1149 ICMP6_PARAMPROB_HEADER, 1150 erroff + opt + 1 - opthead); 1151 return (-1); 1152 } 1153 optlen = IP6OPT_RTALERT_LEN; 1154 bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2); 1155 *rtalertp = ntohs(rtalert_val); 1156 break; 1157 case IP6OPT_JUMBO: 1158 /* XXX may need check for alignment */ 1159 if (hbhlen < IP6OPT_JUMBO_LEN) { 1160 IP6STAT_INC(ip6s_toosmall); 1161 goto bad; 1162 } 1163 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) { 1164 /* XXX stat */ 1165 icmp6_error(m, ICMP6_PARAM_PROB, 1166 ICMP6_PARAMPROB_HEADER, 1167 erroff + opt + 1 - opthead); 1168 return (-1); 1169 } 1170 optlen = IP6OPT_JUMBO_LEN; 1171 1172 /* 1173 * IPv6 packets that have non 0 payload length 1174 * must not contain a jumbo payload option. 1175 */ 1176 ip6 = mtod(m, struct ip6_hdr *); 1177 if (ip6->ip6_plen) { 1178 IP6STAT_INC(ip6s_badoptions); 1179 icmp6_error(m, ICMP6_PARAM_PROB, 1180 ICMP6_PARAMPROB_HEADER, 1181 erroff + opt - opthead); 1182 return (-1); 1183 } 1184 1185 /* 1186 * We may see jumbolen in unaligned location, so 1187 * we'd need to perform bcopy(). 1188 */ 1189 bcopy(opt + 2, &jumboplen, sizeof(jumboplen)); 1190 jumboplen = (u_int32_t)htonl(jumboplen); 1191 1192 #if 1 1193 /* 1194 * if there are multiple jumbo payload options, 1195 * *plenp will be non-zero and the packet will be 1196 * rejected. 1197 * the behavior may need some debate in ipngwg - 1198 * multiple options does not make sense, however, 1199 * there's no explicit mention in specification. 1200 */ 1201 if (*plenp != 0) { 1202 IP6STAT_INC(ip6s_badoptions); 1203 icmp6_error(m, ICMP6_PARAM_PROB, 1204 ICMP6_PARAMPROB_HEADER, 1205 erroff + opt + 2 - opthead); 1206 return (-1); 1207 } 1208 #endif 1209 1210 /* 1211 * jumbo payload length must be larger than 65535. 1212 */ 1213 if (jumboplen <= IPV6_MAXPACKET) { 1214 IP6STAT_INC(ip6s_badoptions); 1215 icmp6_error(m, ICMP6_PARAM_PROB, 1216 ICMP6_PARAMPROB_HEADER, 1217 erroff + opt + 2 - opthead); 1218 return (-1); 1219 } 1220 *plenp = jumboplen; 1221 1222 break; 1223 default: /* unknown option */ 1224 if (hbhlen < IP6OPT_MINLEN) { 1225 IP6STAT_INC(ip6s_toosmall); 1226 goto bad; 1227 } 1228 optlen = ip6_unknown_opt(opt, m, 1229 erroff + opt - opthead); 1230 if (optlen == -1) 1231 return (-1); 1232 optlen += 2; 1233 break; 1234 } 1235 } 1236 1237 return (0); 1238 1239 bad: 1240 m_freem(m); 1241 return (-1); 1242 } 1243 1244 /* 1245 * Unknown option processing. 1246 * The third argument `off' is the offset from the IPv6 header to the option, 1247 * which is necessary if the IPv6 header the and option header and IPv6 header 1248 * is not contiguous in order to return an ICMPv6 error. 1249 */ 1250 int 1251 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off) 1252 { 1253 struct ip6_hdr *ip6; 1254 1255 switch (IP6OPT_TYPE(*optp)) { 1256 case IP6OPT_TYPE_SKIP: /* ignore the option */ 1257 return ((int)*(optp + 1)); 1258 case IP6OPT_TYPE_DISCARD: /* silently discard */ 1259 m_freem(m); 1260 return (-1); 1261 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 1262 IP6STAT_INC(ip6s_badoptions); 1263 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 1264 return (-1); 1265 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 1266 IP6STAT_INC(ip6s_badoptions); 1267 ip6 = mtod(m, struct ip6_hdr *); 1268 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 1269 (m->m_flags & (M_BCAST|M_MCAST))) 1270 m_freem(m); 1271 else 1272 icmp6_error(m, ICMP6_PARAM_PROB, 1273 ICMP6_PARAMPROB_OPTION, off); 1274 return (-1); 1275 } 1276 1277 m_freem(m); /* XXX: NOTREACHED */ 1278 return (-1); 1279 } 1280 1281 /* 1282 * Create the "control" list for this pcb. 1283 * These functions will not modify mbuf chain at all. 1284 * 1285 * With KAME mbuf chain restriction: 1286 * The routine will be called from upper layer handlers like tcp6_input(). 1287 * Thus the routine assumes that the caller (tcp6_input) have already 1288 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the 1289 * very first mbuf on the mbuf chain. 1290 * 1291 * ip6_savecontrol_v4 will handle those options that are possible to be 1292 * set on a v4-mapped socket. 1293 * ip6_savecontrol will directly call ip6_savecontrol_v4 to handle those 1294 * options and handle the v6-only ones itself. 1295 */ 1296 struct mbuf ** 1297 ip6_savecontrol_v4(struct inpcb *inp, struct mbuf *m, struct mbuf **mp, 1298 int *v4only) 1299 { 1300 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1301 1302 #ifdef SO_TIMESTAMP 1303 if ((inp->inp_socket->so_options & SO_TIMESTAMP) != 0) { 1304 struct timeval tv; 1305 1306 microtime(&tv); 1307 *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv), 1308 SCM_TIMESTAMP, SOL_SOCKET); 1309 if (*mp) 1310 mp = &(*mp)->m_next; 1311 } 1312 #endif 1313 1314 #define IS2292(inp, x, y) (((inp)->inp_flags & IN6P_RFC2292) ? (x) : (y)) 1315 /* RFC 2292 sec. 5 */ 1316 if ((inp->inp_flags & IN6P_PKTINFO) != 0) { 1317 struct in6_pktinfo pi6; 1318 1319 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1320 #ifdef INET 1321 struct ip *ip; 1322 1323 ip = mtod(m, struct ip *); 1324 pi6.ipi6_addr.s6_addr32[0] = 0; 1325 pi6.ipi6_addr.s6_addr32[1] = 0; 1326 pi6.ipi6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP; 1327 pi6.ipi6_addr.s6_addr32[3] = ip->ip_dst.s_addr; 1328 #else 1329 /* We won't hit this code */ 1330 bzero(&pi6.ipi6_addr, sizeof(struct in6_addr)); 1331 #endif 1332 } else { 1333 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr)); 1334 in6_clearscope(&pi6.ipi6_addr); /* XXX */ 1335 } 1336 pi6.ipi6_ifindex = 1337 (m && m->m_pkthdr.rcvif) ? m->m_pkthdr.rcvif->if_index : 0; 1338 1339 *mp = sbcreatecontrol((caddr_t) &pi6, 1340 sizeof(struct in6_pktinfo), 1341 IS2292(inp, IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6); 1342 if (*mp) 1343 mp = &(*mp)->m_next; 1344 } 1345 1346 if ((inp->inp_flags & IN6P_HOPLIMIT) != 0) { 1347 int hlim; 1348 1349 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1350 #ifdef INET 1351 struct ip *ip; 1352 1353 ip = mtod(m, struct ip *); 1354 hlim = ip->ip_ttl; 1355 #else 1356 /* We won't hit this code */ 1357 hlim = 0; 1358 #endif 1359 } else { 1360 hlim = ip6->ip6_hlim & 0xff; 1361 } 1362 *mp = sbcreatecontrol((caddr_t) &hlim, sizeof(int), 1363 IS2292(inp, IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), 1364 IPPROTO_IPV6); 1365 if (*mp) 1366 mp = &(*mp)->m_next; 1367 } 1368 1369 if ((inp->inp_flags & IN6P_TCLASS) != 0) { 1370 int tclass; 1371 1372 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1373 #ifdef INET 1374 struct ip *ip; 1375 1376 ip = mtod(m, struct ip *); 1377 tclass = ip->ip_tos; 1378 #else 1379 /* We won't hit this code */ 1380 tclass = 0; 1381 #endif 1382 } else { 1383 u_int32_t flowinfo; 1384 1385 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK); 1386 flowinfo >>= 20; 1387 tclass = flowinfo & 0xff; 1388 } 1389 *mp = sbcreatecontrol((caddr_t) &tclass, sizeof(int), 1390 IPV6_TCLASS, IPPROTO_IPV6); 1391 if (*mp) 1392 mp = &(*mp)->m_next; 1393 } 1394 1395 if (v4only != NULL) { 1396 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1397 *v4only = 1; 1398 } else { 1399 *v4only = 0; 1400 } 1401 } 1402 1403 return (mp); 1404 } 1405 1406 void 1407 ip6_savecontrol(struct inpcb *in6p, struct mbuf *m, struct mbuf **mp) 1408 { 1409 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1410 int v4only = 0; 1411 1412 mp = ip6_savecontrol_v4(in6p, m, mp, &v4only); 1413 if (v4only) 1414 return; 1415 1416 /* 1417 * IPV6_HOPOPTS socket option. Recall that we required super-user 1418 * privilege for the option (see ip6_ctloutput), but it might be too 1419 * strict, since there might be some hop-by-hop options which can be 1420 * returned to normal user. 1421 * See also RFC 2292 section 6 (or RFC 3542 section 8). 1422 */ 1423 if ((in6p->inp_flags & IN6P_HOPOPTS) != 0) { 1424 /* 1425 * Check if a hop-by-hop options header is contatined in the 1426 * received packet, and if so, store the options as ancillary 1427 * data. Note that a hop-by-hop options header must be 1428 * just after the IPv6 header, which is assured through the 1429 * IPv6 input processing. 1430 */ 1431 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 1432 struct ip6_hbh *hbh; 1433 int hbhlen = 0; 1434 #ifdef PULLDOWN_TEST 1435 struct mbuf *ext; 1436 #endif 1437 1438 #ifndef PULLDOWN_TEST 1439 hbh = (struct ip6_hbh *)(ip6 + 1); 1440 hbhlen = (hbh->ip6h_len + 1) << 3; 1441 #else 1442 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr), 1443 ip6->ip6_nxt); 1444 if (ext == NULL) { 1445 IP6STAT_INC(ip6s_tooshort); 1446 return; 1447 } 1448 hbh = mtod(ext, struct ip6_hbh *); 1449 hbhlen = (hbh->ip6h_len + 1) << 3; 1450 if (hbhlen != ext->m_len) { 1451 m_freem(ext); 1452 IP6STAT_INC(ip6s_tooshort); 1453 return; 1454 } 1455 #endif 1456 1457 /* 1458 * XXX: We copy the whole header even if a 1459 * jumbo payload option is included, the option which 1460 * is to be removed before returning according to 1461 * RFC2292. 1462 * Note: this constraint is removed in RFC3542 1463 */ 1464 *mp = sbcreatecontrol((caddr_t)hbh, hbhlen, 1465 IS2292(in6p, IPV6_2292HOPOPTS, IPV6_HOPOPTS), 1466 IPPROTO_IPV6); 1467 if (*mp) 1468 mp = &(*mp)->m_next; 1469 #ifdef PULLDOWN_TEST 1470 m_freem(ext); 1471 #endif 1472 } 1473 } 1474 1475 if ((in6p->inp_flags & (IN6P_RTHDR | IN6P_DSTOPTS)) != 0) { 1476 int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr); 1477 1478 /* 1479 * Search for destination options headers or routing 1480 * header(s) through the header chain, and stores each 1481 * header as ancillary data. 1482 * Note that the order of the headers remains in 1483 * the chain of ancillary data. 1484 */ 1485 while (1) { /* is explicit loop prevention necessary? */ 1486 struct ip6_ext *ip6e = NULL; 1487 int elen; 1488 #ifdef PULLDOWN_TEST 1489 struct mbuf *ext = NULL; 1490 #endif 1491 1492 /* 1493 * if it is not an extension header, don't try to 1494 * pull it from the chain. 1495 */ 1496 switch (nxt) { 1497 case IPPROTO_DSTOPTS: 1498 case IPPROTO_ROUTING: 1499 case IPPROTO_HOPOPTS: 1500 case IPPROTO_AH: /* is it possible? */ 1501 break; 1502 default: 1503 goto loopend; 1504 } 1505 1506 #ifndef PULLDOWN_TEST 1507 if (off + sizeof(*ip6e) > m->m_len) 1508 goto loopend; 1509 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off); 1510 if (nxt == IPPROTO_AH) 1511 elen = (ip6e->ip6e_len + 2) << 2; 1512 else 1513 elen = (ip6e->ip6e_len + 1) << 3; 1514 if (off + elen > m->m_len) 1515 goto loopend; 1516 #else 1517 ext = ip6_pullexthdr(m, off, nxt); 1518 if (ext == NULL) { 1519 IP6STAT_INC(ip6s_tooshort); 1520 return; 1521 } 1522 ip6e = mtod(ext, struct ip6_ext *); 1523 if (nxt == IPPROTO_AH) 1524 elen = (ip6e->ip6e_len + 2) << 2; 1525 else 1526 elen = (ip6e->ip6e_len + 1) << 3; 1527 if (elen != ext->m_len) { 1528 m_freem(ext); 1529 IP6STAT_INC(ip6s_tooshort); 1530 return; 1531 } 1532 #endif 1533 1534 switch (nxt) { 1535 case IPPROTO_DSTOPTS: 1536 if (!(in6p->inp_flags & IN6P_DSTOPTS)) 1537 break; 1538 1539 *mp = sbcreatecontrol((caddr_t)ip6e, elen, 1540 IS2292(in6p, 1541 IPV6_2292DSTOPTS, IPV6_DSTOPTS), 1542 IPPROTO_IPV6); 1543 if (*mp) 1544 mp = &(*mp)->m_next; 1545 break; 1546 case IPPROTO_ROUTING: 1547 if (!(in6p->inp_flags & IN6P_RTHDR)) 1548 break; 1549 1550 *mp = sbcreatecontrol((caddr_t)ip6e, elen, 1551 IS2292(in6p, IPV6_2292RTHDR, IPV6_RTHDR), 1552 IPPROTO_IPV6); 1553 if (*mp) 1554 mp = &(*mp)->m_next; 1555 break; 1556 case IPPROTO_HOPOPTS: 1557 case IPPROTO_AH: /* is it possible? */ 1558 break; 1559 1560 default: 1561 /* 1562 * other cases have been filtered in the above. 1563 * none will visit this case. here we supply 1564 * the code just in case (nxt overwritten or 1565 * other cases). 1566 */ 1567 #ifdef PULLDOWN_TEST 1568 m_freem(ext); 1569 #endif 1570 goto loopend; 1571 1572 } 1573 1574 /* proceed with the next header. */ 1575 off += elen; 1576 nxt = ip6e->ip6e_nxt; 1577 ip6e = NULL; 1578 #ifdef PULLDOWN_TEST 1579 m_freem(ext); 1580 ext = NULL; 1581 #endif 1582 } 1583 loopend: 1584 ; 1585 } 1586 } 1587 #undef IS2292 1588 1589 void 1590 ip6_notify_pmtu(struct inpcb *in6p, struct sockaddr_in6 *dst, u_int32_t *mtu) 1591 { 1592 struct socket *so; 1593 struct mbuf *m_mtu; 1594 struct ip6_mtuinfo mtuctl; 1595 1596 so = in6p->inp_socket; 1597 1598 if (mtu == NULL) 1599 return; 1600 1601 #ifdef DIAGNOSTIC 1602 if (so == NULL) /* I believe this is impossible */ 1603 panic("ip6_notify_pmtu: socket is NULL"); 1604 #endif 1605 1606 bzero(&mtuctl, sizeof(mtuctl)); /* zero-clear for safety */ 1607 mtuctl.ip6m_mtu = *mtu; 1608 mtuctl.ip6m_addr = *dst; 1609 if (sa6_recoverscope(&mtuctl.ip6m_addr)) 1610 return; 1611 1612 if ((m_mtu = sbcreatecontrol((caddr_t)&mtuctl, sizeof(mtuctl), 1613 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL) 1614 return; 1615 1616 if (sbappendaddr(&so->so_rcv, (struct sockaddr *)dst, NULL, m_mtu) 1617 == 0) { 1618 m_freem(m_mtu); 1619 /* XXX: should count statistics */ 1620 } else 1621 sorwakeup(so); 1622 1623 return; 1624 } 1625 1626 #ifdef PULLDOWN_TEST 1627 /* 1628 * pull single extension header from mbuf chain. returns single mbuf that 1629 * contains the result, or NULL on error. 1630 */ 1631 static struct mbuf * 1632 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt) 1633 { 1634 struct ip6_ext ip6e; 1635 size_t elen; 1636 struct mbuf *n; 1637 1638 #ifdef DIAGNOSTIC 1639 switch (nxt) { 1640 case IPPROTO_DSTOPTS: 1641 case IPPROTO_ROUTING: 1642 case IPPROTO_HOPOPTS: 1643 case IPPROTO_AH: /* is it possible? */ 1644 break; 1645 default: 1646 printf("ip6_pullexthdr: invalid nxt=%d\n", nxt); 1647 } 1648 #endif 1649 1650 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1651 if (nxt == IPPROTO_AH) 1652 elen = (ip6e.ip6e_len + 2) << 2; 1653 else 1654 elen = (ip6e.ip6e_len + 1) << 3; 1655 1656 if (elen > MLEN) 1657 n = m_getcl(M_NOWAIT, MT_DATA, 0); 1658 else 1659 n = m_get(M_NOWAIT, MT_DATA); 1660 if (n == NULL) 1661 return NULL; 1662 1663 m_copydata(m, off, elen, mtod(n, caddr_t)); 1664 n->m_len = elen; 1665 return n; 1666 } 1667 #endif 1668 1669 /* 1670 * Get pointer to the previous header followed by the header 1671 * currently processed. 1672 * XXX: This function supposes that 1673 * M includes all headers, 1674 * the next header field and the header length field of each header 1675 * are valid, and 1676 * the sum of each header length equals to OFF. 1677 * Because of these assumptions, this function must be called very 1678 * carefully. Moreover, it will not be used in the near future when 1679 * we develop `neater' mechanism to process extension headers. 1680 */ 1681 char * 1682 ip6_get_prevhdr(struct mbuf *m, int off) 1683 { 1684 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1685 1686 if (off == sizeof(struct ip6_hdr)) 1687 return (&ip6->ip6_nxt); 1688 else { 1689 int len, nxt; 1690 struct ip6_ext *ip6e = NULL; 1691 1692 nxt = ip6->ip6_nxt; 1693 len = sizeof(struct ip6_hdr); 1694 while (len < off) { 1695 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len); 1696 1697 switch (nxt) { 1698 case IPPROTO_FRAGMENT: 1699 len += sizeof(struct ip6_frag); 1700 break; 1701 case IPPROTO_AH: 1702 len += (ip6e->ip6e_len + 2) << 2; 1703 break; 1704 default: 1705 len += (ip6e->ip6e_len + 1) << 3; 1706 break; 1707 } 1708 nxt = ip6e->ip6e_nxt; 1709 } 1710 if (ip6e) 1711 return (&ip6e->ip6e_nxt); 1712 else 1713 return NULL; 1714 } 1715 } 1716 1717 /* 1718 * get next header offset. m will be retained. 1719 */ 1720 int 1721 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp) 1722 { 1723 struct ip6_hdr ip6; 1724 struct ip6_ext ip6e; 1725 struct ip6_frag fh; 1726 1727 /* just in case */ 1728 if (m == NULL) 1729 panic("ip6_nexthdr: m == NULL"); 1730 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off) 1731 return -1; 1732 1733 switch (proto) { 1734 case IPPROTO_IPV6: 1735 if (m->m_pkthdr.len < off + sizeof(ip6)) 1736 return -1; 1737 m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6); 1738 if (nxtp) 1739 *nxtp = ip6.ip6_nxt; 1740 off += sizeof(ip6); 1741 return off; 1742 1743 case IPPROTO_FRAGMENT: 1744 /* 1745 * terminate parsing if it is not the first fragment, 1746 * it does not make sense to parse through it. 1747 */ 1748 if (m->m_pkthdr.len < off + sizeof(fh)) 1749 return -1; 1750 m_copydata(m, off, sizeof(fh), (caddr_t)&fh); 1751 /* IP6F_OFF_MASK = 0xfff8(BigEndian), 0xf8ff(LittleEndian) */ 1752 if (fh.ip6f_offlg & IP6F_OFF_MASK) 1753 return -1; 1754 if (nxtp) 1755 *nxtp = fh.ip6f_nxt; 1756 off += sizeof(struct ip6_frag); 1757 return off; 1758 1759 case IPPROTO_AH: 1760 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1761 return -1; 1762 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1763 if (nxtp) 1764 *nxtp = ip6e.ip6e_nxt; 1765 off += (ip6e.ip6e_len + 2) << 2; 1766 return off; 1767 1768 case IPPROTO_HOPOPTS: 1769 case IPPROTO_ROUTING: 1770 case IPPROTO_DSTOPTS: 1771 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1772 return -1; 1773 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1774 if (nxtp) 1775 *nxtp = ip6e.ip6e_nxt; 1776 off += (ip6e.ip6e_len + 1) << 3; 1777 return off; 1778 1779 case IPPROTO_NONE: 1780 case IPPROTO_ESP: 1781 case IPPROTO_IPCOMP: 1782 /* give up */ 1783 return -1; 1784 1785 default: 1786 return -1; 1787 } 1788 1789 return -1; 1790 } 1791 1792 /* 1793 * get offset for the last header in the chain. m will be kept untainted. 1794 */ 1795 int 1796 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp) 1797 { 1798 int newoff; 1799 int nxt; 1800 1801 if (!nxtp) { 1802 nxt = -1; 1803 nxtp = &nxt; 1804 } 1805 while (1) { 1806 newoff = ip6_nexthdr(m, off, proto, nxtp); 1807 if (newoff < 0) 1808 return off; 1809 else if (newoff < off) 1810 return -1; /* invalid */ 1811 else if (newoff == off) 1812 return newoff; 1813 1814 off = newoff; 1815 proto = *nxtp; 1816 } 1817 } 1818 1819 static struct ip6aux * 1820 ip6_addaux(struct mbuf *m) 1821 { 1822 struct m_tag *mtag; 1823 1824 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL); 1825 if (!mtag) { 1826 mtag = m_tag_get(PACKET_TAG_IPV6_INPUT, sizeof(struct ip6aux), 1827 M_NOWAIT); 1828 if (mtag) { 1829 m_tag_prepend(m, mtag); 1830 bzero(mtag + 1, sizeof(struct ip6aux)); 1831 } 1832 } 1833 return mtag ? (struct ip6aux *)(mtag + 1) : NULL; 1834 } 1835 1836 static struct ip6aux * 1837 ip6_findaux(struct mbuf *m) 1838 { 1839 struct m_tag *mtag; 1840 1841 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL); 1842 return mtag ? (struct ip6aux *)(mtag + 1) : NULL; 1843 } 1844 1845 static void 1846 ip6_delaux(struct mbuf *m) 1847 { 1848 struct m_tag *mtag; 1849 1850 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL); 1851 if (mtag) 1852 m_tag_delete(m, mtag); 1853 } 1854 1855 /* 1856 * System control for IP6 1857 */ 1858 1859 u_char inet6ctlerrmap[PRC_NCMDS] = { 1860 0, 0, 0, 0, 1861 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 1862 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 1863 EMSGSIZE, EHOSTUNREACH, 0, 0, 1864 0, 0, 0, 0, 1865 ENOPROTOOPT 1866 }; 1867