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sys/netinet6/ip6_input.c
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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: releng/10.4/sys/netinet6/ip6_input.c 279911 2015-03-12 09:04:19Z ae $"); 65 66 #include "opt_inet.h" 67 #include "opt_inet6.h" 68 #include "opt_ipfw.h" 69 #include "opt_ipsec.h" 70 #include "opt_kdtrace.h" 71 #include "opt_route.h" 72 73 #include <sys/param.h> 74 #include <sys/systm.h> 75 #include <sys/malloc.h> 76 #include <sys/mbuf.h> 77 #include <sys/proc.h> 78 #include <sys/domain.h> 79 #include <sys/protosw.h> 80 #include <sys/sdt.h> 81 #include <sys/socket.h> 82 #include <sys/socketvar.h> 83 #include <sys/errno.h> 84 #include <sys/time.h> 85 #include <sys/kernel.h> 86 #include <sys/syslog.h> 87 88 #include <net/if.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 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && 551 IPV6_ADDR_MC_SCOPE(&ip6->ip6_dst) == 0) { 552 /* 553 * RFC4291 2.7: 554 * Nodes must not originate a packet to a multicast address 555 * whose scop field contains the reserved value 0; if such 556 * a packet is received, it must be silently dropped. 557 */ 558 IP6STAT_INC(ip6s_badscope); 559 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 560 goto bad; 561 } 562 #ifdef ALTQ 563 if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) { 564 /* packet is dropped by traffic conditioner */ 565 return; 566 } 567 #endif 568 /* 569 * The following check is not documented in specs. A malicious 570 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack 571 * and bypass security checks (act as if it was from 127.0.0.1 by using 572 * IPv6 src ::ffff:127.0.0.1). Be cautious. 573 * 574 * This check chokes if we are in an SIIT cloud. As none of BSDs 575 * support IPv4-less kernel compilation, we cannot support SIIT 576 * environment at all. So, it makes more sense for us to reject any 577 * malicious packets for non-SIIT environment, than try to do a 578 * partial support for SIIT environment. 579 */ 580 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 581 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 582 IP6STAT_INC(ip6s_badscope); 583 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 584 goto bad; 585 } 586 #if 0 587 /* 588 * Reject packets with IPv4 compatible addresses (auto tunnel). 589 * 590 * The code forbids auto tunnel relay case in RFC1933 (the check is 591 * stronger than RFC1933). We may want to re-enable it if mech-xx 592 * is revised to forbid relaying case. 593 */ 594 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) || 595 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) { 596 IP6STAT_INC(ip6s_badscope); 597 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 598 goto bad; 599 } 600 #endif 601 #ifdef IPSEC 602 /* 603 * Bypass packet filtering for packets previously handled by IPsec. 604 */ 605 if (ip6_ipsec_filtertunnel(m)) 606 goto passin; 607 #endif /* IPSEC */ 608 609 /* 610 * Run through list of hooks for input packets. 611 * 612 * NB: Beware of the destination address changing 613 * (e.g. by NAT rewriting). When this happens, 614 * tell ip6_forward to do the right thing. 615 */ 616 odst = ip6->ip6_dst; 617 618 /* Jump over all PFIL processing if hooks are not active. */ 619 if (!PFIL_HOOKED(&V_inet6_pfil_hook)) 620 goto passin; 621 622 if (pfil_run_hooks(&V_inet6_pfil_hook, &m, 623 m->m_pkthdr.rcvif, PFIL_IN, NULL)) 624 return; 625 if (m == NULL) /* consumed by filter */ 626 return; 627 ip6 = mtod(m, struct ip6_hdr *); 628 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst); 629 630 if (m->m_flags & M_FASTFWD_OURS) { 631 m->m_flags &= ~M_FASTFWD_OURS; 632 ours = 1; 633 deliverifp = m->m_pkthdr.rcvif; 634 goto hbhcheck; 635 } 636 if ((m->m_flags & M_IP6_NEXTHOP) && 637 m_tag_find(m, PACKET_TAG_IPFORWARD, NULL) != NULL) { 638 /* 639 * Directly ship the packet on. This allows forwarding 640 * packets originally destined to us to some other directly 641 * connected host. 642 */ 643 ip6_forward(m, 1); 644 goto out; 645 } 646 647 passin: 648 /* 649 * Disambiguate address scope zones (if there is ambiguity). 650 * We first make sure that the original source or destination address 651 * is not in our internal form for scoped addresses. Such addresses 652 * are not necessarily invalid spec-wise, but we cannot accept them due 653 * to the usage conflict. 654 * in6_setscope() then also checks and rejects the cases where src or 655 * dst are the loopback address and the receiving interface 656 * is not loopback. 657 */ 658 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) { 659 IP6STAT_INC(ip6s_badscope); /* XXX */ 660 goto bad; 661 } 662 if (in6_setscope(&ip6->ip6_src, m->m_pkthdr.rcvif, NULL) || 663 in6_setscope(&ip6->ip6_dst, m->m_pkthdr.rcvif, NULL)) { 664 IP6STAT_INC(ip6s_badscope); 665 goto bad; 666 } 667 668 /* 669 * Multicast check. Assume packet is for us to avoid 670 * prematurely taking locks. 671 */ 672 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 673 ours = 1; 674 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast); 675 deliverifp = m->m_pkthdr.rcvif; 676 goto hbhcheck; 677 } 678 679 /* 680 * Unicast check 681 */ 682 683 bzero(&dst6, sizeof(dst6)); 684 dst6.sin6_family = AF_INET6; 685 dst6.sin6_len = sizeof(struct sockaddr_in6); 686 dst6.sin6_addr = ip6->ip6_dst; 687 ifp = m->m_pkthdr.rcvif; 688 IF_AFDATA_RLOCK(ifp); 689 lle = lla_lookup(LLTABLE6(ifp), 0, 690 (struct sockaddr *)&dst6); 691 IF_AFDATA_RUNLOCK(ifp); 692 if ((lle != NULL) && (lle->la_flags & LLE_IFADDR)) { 693 struct ifaddr *ifa; 694 struct in6_ifaddr *ia6; 695 int bad; 696 697 bad = 1; 698 #define sa_equal(a1, a2) \ 699 (bcmp((a1), (a2), ((a1))->sin6_len) == 0) 700 IF_ADDR_RLOCK(ifp); 701 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 702 if (ifa->ifa_addr->sa_family != dst6.sin6_family) 703 continue; 704 if (sa_equal(&dst6, ifa->ifa_addr)) 705 break; 706 } 707 KASSERT(ifa != NULL, ("%s: ifa not found for lle %p", 708 __func__, lle)); 709 #undef sa_equal 710 711 ia6 = (struct in6_ifaddr *)ifa; 712 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) { 713 /* Count the packet in the ip address stats */ 714 ia6->ia_ifa.if_ipackets++; 715 ia6->ia_ifa.if_ibytes += m->m_pkthdr.len; 716 717 /* 718 * record address information into m_tag. 719 */ 720 (void)ip6_setdstifaddr(m, ia6); 721 722 bad = 0; 723 } else { 724 char ip6bufs[INET6_ADDRSTRLEN]; 725 char ip6bufd[INET6_ADDRSTRLEN]; 726 /* address is not ready, so discard the packet. */ 727 nd6log((LOG_INFO, 728 "ip6_input: packet to an unready address %s->%s\n", 729 ip6_sprintf(ip6bufs, &ip6->ip6_src), 730 ip6_sprintf(ip6bufd, &ip6->ip6_dst))); 731 } 732 IF_ADDR_RUNLOCK(ifp); 733 LLE_RUNLOCK(lle); 734 if (bad) 735 goto bad; 736 else { 737 ours = 1; 738 deliverifp = ifp; 739 goto hbhcheck; 740 } 741 } 742 if (lle != NULL) 743 LLE_RUNLOCK(lle); 744 745 dst = &rin6.ro_dst; 746 dst->sin6_len = sizeof(struct sockaddr_in6); 747 dst->sin6_family = AF_INET6; 748 dst->sin6_addr = ip6->ip6_dst; 749 rin6.ro_rt = in6_rtalloc1((struct sockaddr *)dst, 0, 0, M_GETFIB(m)); 750 if (rin6.ro_rt) 751 RT_UNLOCK(rin6.ro_rt); 752 753 #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key)) 754 755 /* 756 * Accept the packet if the forwarding interface to the destination 757 * according to the routing table is the loopback interface, 758 * unless the associated route has a gateway. 759 * Note that this approach causes to accept a packet if there is a 760 * route to the loopback interface for the destination of the packet. 761 * But we think it's even useful in some situations, e.g. when using 762 * a special daemon which wants to intercept the packet. 763 * 764 * XXX: some OSes automatically make a cloned route for the destination 765 * of an outgoing packet. If the outgoing interface of the packet 766 * is a loopback one, the kernel would consider the packet to be 767 * accepted, even if we have no such address assinged on the interface. 768 * We check the cloned flag of the route entry to reject such cases, 769 * assuming that route entries for our own addresses are not made by 770 * cloning (it should be true because in6_addloop explicitly installs 771 * the host route). However, we might have to do an explicit check 772 * while it would be less efficient. Or, should we rather install a 773 * reject route for such a case? 774 */ 775 if (rin6.ro_rt && 776 (rin6.ro_rt->rt_flags & 777 (RTF_HOST|RTF_GATEWAY)) == RTF_HOST && 778 #ifdef RTF_WASCLONED 779 !(rin6.ro_rt->rt_flags & RTF_WASCLONED) && 780 #endif 781 #ifdef RTF_CLONED 782 !(rin6.ro_rt->rt_flags & RTF_CLONED) && 783 #endif 784 #if 0 785 /* 786 * The check below is redundant since the comparison of 787 * the destination and the key of the rtentry has 788 * already done through looking up the routing table. 789 */ 790 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 791 &rt6_key(rin6.ro_rt)->sin6_addr) 792 #endif 793 rin6.ro_rt->rt_ifp->if_type == IFT_LOOP) { 794 int free_ia6 = 0; 795 struct in6_ifaddr *ia6; 796 797 /* 798 * found the loopback route to the interface address 799 */ 800 if (rin6.ro_rt->rt_gateway->sa_family == AF_LINK) { 801 struct sockaddr_in6 dest6; 802 803 bzero(&dest6, sizeof(dest6)); 804 dest6.sin6_family = AF_INET6; 805 dest6.sin6_len = sizeof(dest6); 806 dest6.sin6_addr = ip6->ip6_dst; 807 ia6 = (struct in6_ifaddr *) 808 ifa_ifwithaddr((struct sockaddr *)&dest6); 809 if (ia6 == NULL) 810 goto bad; 811 free_ia6 = 1; 812 } 813 else 814 ia6 = (struct in6_ifaddr *)rin6.ro_rt->rt_ifa; 815 816 /* 817 * record address information into m_tag. 818 */ 819 (void)ip6_setdstifaddr(m, ia6); 820 821 /* 822 * packets to a tentative, duplicated, or somehow invalid 823 * address must not be accepted. 824 */ 825 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) { 826 /* this address is ready */ 827 ours = 1; 828 deliverifp = ia6->ia_ifp; /* correct? */ 829 /* Count the packet in the ip address stats */ 830 ia6->ia_ifa.if_ipackets++; 831 ia6->ia_ifa.if_ibytes += m->m_pkthdr.len; 832 if (ia6 != NULL && free_ia6 != 0) 833 ifa_free(&ia6->ia_ifa); 834 goto hbhcheck; 835 } else { 836 char ip6bufs[INET6_ADDRSTRLEN]; 837 char ip6bufd[INET6_ADDRSTRLEN]; 838 /* address is not ready, so discard the packet. */ 839 nd6log((LOG_INFO, 840 "ip6_input: packet to an unready address %s->%s\n", 841 ip6_sprintf(ip6bufs, &ip6->ip6_src), 842 ip6_sprintf(ip6bufd, &ip6->ip6_dst))); 843 844 if (ia6 != NULL && free_ia6 != 0) 845 ifa_free(&ia6->ia_ifa); 846 goto bad; 847 } 848 } 849 850 /* 851 * FAITH (Firewall Aided Internet Translator) 852 */ 853 if (V_ip6_keepfaith) { 854 if (rin6.ro_rt && rin6.ro_rt->rt_ifp && 855 rin6.ro_rt->rt_ifp->if_type == IFT_FAITH) { 856 /* XXX do we need more sanity checks? */ 857 ours = 1; 858 deliverifp = rin6.ro_rt->rt_ifp; /* faith */ 859 goto hbhcheck; 860 } 861 } 862 863 /* 864 * Now there is no reason to process the packet if it's not our own 865 * and we're not a router. 866 */ 867 if (!V_ip6_forwarding) { 868 IP6STAT_INC(ip6s_cantforward); 869 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 870 goto bad; 871 } 872 873 hbhcheck: 874 /* 875 * record address information into m_tag, if we don't have one yet. 876 * note that we are unable to record it, if the address is not listed 877 * as our interface address (e.g. multicast addresses, addresses 878 * within FAITH prefixes and such). 879 */ 880 if (deliverifp) { 881 struct in6_ifaddr *ia6; 882 883 if ((ia6 = ip6_getdstifaddr(m)) != NULL) { 884 ifa_free(&ia6->ia_ifa); 885 } else { 886 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 887 if (ia6) { 888 if (!ip6_setdstifaddr(m, ia6)) { 889 /* 890 * XXX maybe we should drop the packet here, 891 * as we could not provide enough information 892 * to the upper layers. 893 */ 894 } 895 ifa_free(&ia6->ia_ifa); 896 } 897 } 898 } 899 900 /* 901 * Process Hop-by-Hop options header if it's contained. 902 * m may be modified in ip6_hopopts_input(). 903 * If a JumboPayload option is included, plen will also be modified. 904 */ 905 plen = (u_int32_t)ntohs(ip6->ip6_plen); 906 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 907 int error; 908 909 error = ip6_input_hbh(m, &plen, &rtalert, &off, &nxt, &ours); 910 if (error != 0) 911 goto out; 912 } else 913 nxt = ip6->ip6_nxt; 914 915 /* 916 * Check that the amount of data in the buffers 917 * is as at least much as the IPv6 header would have us expect. 918 * Trim mbufs if longer than we expect. 919 * Drop packet if shorter than we expect. 920 */ 921 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 922 IP6STAT_INC(ip6s_tooshort); 923 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 924 goto bad; 925 } 926 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 927 if (m->m_len == m->m_pkthdr.len) { 928 m->m_len = sizeof(struct ip6_hdr) + plen; 929 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 930 } else 931 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 932 } 933 934 /* 935 * Forward if desirable. 936 */ 937 if (V_ip6_mrouter && 938 IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 939 /* 940 * If we are acting as a multicast router, all 941 * incoming multicast packets are passed to the 942 * kernel-level multicast forwarding function. 943 * The packet is returned (relatively) intact; if 944 * ip6_mforward() returns a non-zero value, the packet 945 * must be discarded, else it may be accepted below. 946 * 947 * XXX TODO: Check hlim and multicast scope here to avoid 948 * unnecessarily calling into ip6_mforward(). 949 */ 950 if (ip6_mforward && 951 ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) { 952 IP6STAT_INC(ip6s_cantforward); 953 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 954 goto bad; 955 } 956 } else if (!ours) { 957 ip6_forward(m, srcrt); 958 goto out; 959 } 960 961 ip6 = mtod(m, struct ip6_hdr *); 962 963 /* 964 * Malicious party may be able to use IPv4 mapped addr to confuse 965 * tcp/udp stack and bypass security checks (act as if it was from 966 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious. 967 * 968 * For SIIT end node behavior, you may want to disable the check. 969 * However, you will become vulnerable to attacks using IPv4 mapped 970 * source. 971 */ 972 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 973 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 974 IP6STAT_INC(ip6s_badscope); 975 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 976 goto bad; 977 } 978 979 /* 980 * Tell launch routine the next header 981 */ 982 IP6STAT_INC(ip6s_delivered); 983 in6_ifstat_inc(deliverifp, ifs6_in_deliver); 984 nest = 0; 985 986 while (nxt != IPPROTO_DONE) { 987 if (V_ip6_hdrnestlimit && (++nest > V_ip6_hdrnestlimit)) { 988 IP6STAT_INC(ip6s_toomanyhdr); 989 goto bad; 990 } 991 992 /* 993 * protection against faulty packet - there should be 994 * more sanity checks in header chain processing. 995 */ 996 if (m->m_pkthdr.len < off) { 997 IP6STAT_INC(ip6s_tooshort); 998 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 999 goto bad; 1000 } 1001 1002 #ifdef IPSEC 1003 /* 1004 * enforce IPsec policy checking if we are seeing last header. 1005 * note that we do not visit this with protocols with pcb layer 1006 * code - like udp/tcp/raw ip. 1007 */ 1008 if (ip6_ipsec_input(m, nxt)) 1009 goto bad; 1010 #endif /* IPSEC */ 1011 1012 /* 1013 * Use mbuf flags to propagate Router Alert option to 1014 * ICMPv6 layer, as hop-by-hop options have been stripped. 1015 */ 1016 if (nxt == IPPROTO_ICMPV6 && rtalert != ~0) 1017 m->m_flags |= M_RTALERT_MLD; 1018 1019 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt); 1020 } 1021 goto out; 1022 bad: 1023 m_freem(m); 1024 out: 1025 if (rin6.ro_rt) 1026 RTFREE(rin6.ro_rt); 1027 } 1028 1029 /* 1030 * set/grab in6_ifaddr correspond to IPv6 destination address. 1031 * XXX backward compatibility wrapper 1032 * 1033 * XXXRW: We should bump the refcount on ia6 before sticking it in the m_tag, 1034 * and then bump it when the tag is copied, and release it when the tag is 1035 * freed. Unfortunately, m_tags don't support deep copies (yet), so instead 1036 * we just bump the ia refcount when we receive it. This should be fixed. 1037 */ 1038 static struct ip6aux * 1039 ip6_setdstifaddr(struct mbuf *m, struct in6_ifaddr *ia6) 1040 { 1041 struct ip6aux *ip6a; 1042 1043 ip6a = ip6_addaux(m); 1044 if (ip6a) 1045 ip6a->ip6a_dstia6 = ia6; 1046 return ip6a; /* NULL if failed to set */ 1047 } 1048 1049 struct in6_ifaddr * 1050 ip6_getdstifaddr(struct mbuf *m) 1051 { 1052 struct ip6aux *ip6a; 1053 struct in6_ifaddr *ia; 1054 1055 ip6a = ip6_findaux(m); 1056 if (ip6a) { 1057 ia = ip6a->ip6a_dstia6; 1058 ifa_ref(&ia->ia_ifa); 1059 return ia; 1060 } else 1061 return NULL; 1062 } 1063 1064 /* 1065 * Hop-by-Hop options header processing. If a valid jumbo payload option is 1066 * included, the real payload length will be stored in plenp. 1067 * 1068 * rtalertp - XXX: should be stored more smart way 1069 */ 1070 static int 1071 ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp, 1072 struct mbuf **mp, int *offp) 1073 { 1074 struct mbuf *m = *mp; 1075 int off = *offp, hbhlen; 1076 struct ip6_hbh *hbh; 1077 1078 /* validation of the length of the header */ 1079 #ifndef PULLDOWN_TEST 1080 IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1); 1081 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); 1082 hbhlen = (hbh->ip6h_len + 1) << 3; 1083 1084 IP6_EXTHDR_CHECK(m, off, hbhlen, -1); 1085 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); 1086 #else 1087 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, 1088 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh)); 1089 if (hbh == NULL) { 1090 IP6STAT_INC(ip6s_tooshort); 1091 return -1; 1092 } 1093 hbhlen = (hbh->ip6h_len + 1) << 3; 1094 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 1095 hbhlen); 1096 if (hbh == NULL) { 1097 IP6STAT_INC(ip6s_tooshort); 1098 return -1; 1099 } 1100 #endif 1101 off += hbhlen; 1102 hbhlen -= sizeof(struct ip6_hbh); 1103 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 1104 hbhlen, rtalertp, plenp) < 0) 1105 return (-1); 1106 1107 *offp = off; 1108 *mp = m; 1109 return (0); 1110 } 1111 1112 /* 1113 * Search header for all Hop-by-hop options and process each option. 1114 * This function is separate from ip6_hopopts_input() in order to 1115 * handle a case where the sending node itself process its hop-by-hop 1116 * options header. In such a case, the function is called from ip6_output(). 1117 * 1118 * The function assumes that hbh header is located right after the IPv6 header 1119 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to 1120 * opthead + hbhlen is located in contiguous memory region. 1121 */ 1122 int 1123 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen, 1124 u_int32_t *rtalertp, u_int32_t *plenp) 1125 { 1126 struct ip6_hdr *ip6; 1127 int optlen = 0; 1128 u_int8_t *opt = opthead; 1129 u_int16_t rtalert_val; 1130 u_int32_t jumboplen; 1131 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh); 1132 1133 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 1134 switch (*opt) { 1135 case IP6OPT_PAD1: 1136 optlen = 1; 1137 break; 1138 case IP6OPT_PADN: 1139 if (hbhlen < IP6OPT_MINLEN) { 1140 IP6STAT_INC(ip6s_toosmall); 1141 goto bad; 1142 } 1143 optlen = *(opt + 1) + 2; 1144 break; 1145 case IP6OPT_ROUTER_ALERT: 1146 /* XXX may need check for alignment */ 1147 if (hbhlen < IP6OPT_RTALERT_LEN) { 1148 IP6STAT_INC(ip6s_toosmall); 1149 goto bad; 1150 } 1151 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) { 1152 /* XXX stat */ 1153 icmp6_error(m, ICMP6_PARAM_PROB, 1154 ICMP6_PARAMPROB_HEADER, 1155 erroff + opt + 1 - opthead); 1156 return (-1); 1157 } 1158 optlen = IP6OPT_RTALERT_LEN; 1159 bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2); 1160 *rtalertp = ntohs(rtalert_val); 1161 break; 1162 case IP6OPT_JUMBO: 1163 /* XXX may need check for alignment */ 1164 if (hbhlen < IP6OPT_JUMBO_LEN) { 1165 IP6STAT_INC(ip6s_toosmall); 1166 goto bad; 1167 } 1168 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) { 1169 /* XXX stat */ 1170 icmp6_error(m, ICMP6_PARAM_PROB, 1171 ICMP6_PARAMPROB_HEADER, 1172 erroff + opt + 1 - opthead); 1173 return (-1); 1174 } 1175 optlen = IP6OPT_JUMBO_LEN; 1176 1177 /* 1178 * IPv6 packets that have non 0 payload length 1179 * must not contain a jumbo payload option. 1180 */ 1181 ip6 = mtod(m, struct ip6_hdr *); 1182 if (ip6->ip6_plen) { 1183 IP6STAT_INC(ip6s_badoptions); 1184 icmp6_error(m, ICMP6_PARAM_PROB, 1185 ICMP6_PARAMPROB_HEADER, 1186 erroff + opt - opthead); 1187 return (-1); 1188 } 1189 1190 /* 1191 * We may see jumbolen in unaligned location, so 1192 * we'd need to perform bcopy(). 1193 */ 1194 bcopy(opt + 2, &jumboplen, sizeof(jumboplen)); 1195 jumboplen = (u_int32_t)htonl(jumboplen); 1196 1197 #if 1 1198 /* 1199 * if there are multiple jumbo payload options, 1200 * *plenp will be non-zero and the packet will be 1201 * rejected. 1202 * the behavior may need some debate in ipngwg - 1203 * multiple options does not make sense, however, 1204 * there's no explicit mention in specification. 1205 */ 1206 if (*plenp != 0) { 1207 IP6STAT_INC(ip6s_badoptions); 1208 icmp6_error(m, ICMP6_PARAM_PROB, 1209 ICMP6_PARAMPROB_HEADER, 1210 erroff + opt + 2 - opthead); 1211 return (-1); 1212 } 1213 #endif 1214 1215 /* 1216 * jumbo payload length must be larger than 65535. 1217 */ 1218 if (jumboplen <= IPV6_MAXPACKET) { 1219 IP6STAT_INC(ip6s_badoptions); 1220 icmp6_error(m, ICMP6_PARAM_PROB, 1221 ICMP6_PARAMPROB_HEADER, 1222 erroff + opt + 2 - opthead); 1223 return (-1); 1224 } 1225 *plenp = jumboplen; 1226 1227 break; 1228 default: /* unknown option */ 1229 if (hbhlen < IP6OPT_MINLEN) { 1230 IP6STAT_INC(ip6s_toosmall); 1231 goto bad; 1232 } 1233 optlen = ip6_unknown_opt(opt, m, 1234 erroff + opt - opthead); 1235 if (optlen == -1) 1236 return (-1); 1237 optlen += 2; 1238 break; 1239 } 1240 } 1241 1242 return (0); 1243 1244 bad: 1245 m_freem(m); 1246 return (-1); 1247 } 1248 1249 /* 1250 * Unknown option processing. 1251 * The third argument `off' is the offset from the IPv6 header to the option, 1252 * which is necessary if the IPv6 header the and option header and IPv6 header 1253 * is not contiguous in order to return an ICMPv6 error. 1254 */ 1255 int 1256 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off) 1257 { 1258 struct ip6_hdr *ip6; 1259 1260 switch (IP6OPT_TYPE(*optp)) { 1261 case IP6OPT_TYPE_SKIP: /* ignore the option */ 1262 return ((int)*(optp + 1)); 1263 case IP6OPT_TYPE_DISCARD: /* silently discard */ 1264 m_freem(m); 1265 return (-1); 1266 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 1267 IP6STAT_INC(ip6s_badoptions); 1268 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 1269 return (-1); 1270 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 1271 IP6STAT_INC(ip6s_badoptions); 1272 ip6 = mtod(m, struct ip6_hdr *); 1273 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 1274 (m->m_flags & (M_BCAST|M_MCAST))) 1275 m_freem(m); 1276 else 1277 icmp6_error(m, ICMP6_PARAM_PROB, 1278 ICMP6_PARAMPROB_OPTION, off); 1279 return (-1); 1280 } 1281 1282 m_freem(m); /* XXX: NOTREACHED */ 1283 return (-1); 1284 } 1285 1286 /* 1287 * Create the "control" list for this pcb. 1288 * These functions will not modify mbuf chain at all. 1289 * 1290 * With KAME mbuf chain restriction: 1291 * The routine will be called from upper layer handlers like tcp6_input(). 1292 * Thus the routine assumes that the caller (tcp6_input) have already 1293 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the 1294 * very first mbuf on the mbuf chain. 1295 * 1296 * ip6_savecontrol_v4 will handle those options that are possible to be 1297 * set on a v4-mapped socket. 1298 * ip6_savecontrol will directly call ip6_savecontrol_v4 to handle those 1299 * options and handle the v6-only ones itself. 1300 */ 1301 struct mbuf ** 1302 ip6_savecontrol_v4(struct inpcb *inp, struct mbuf *m, struct mbuf **mp, 1303 int *v4only) 1304 { 1305 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1306 1307 #ifdef SO_TIMESTAMP 1308 if ((inp->inp_socket->so_options & SO_TIMESTAMP) != 0) { 1309 struct timeval tv; 1310 1311 microtime(&tv); 1312 *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv), 1313 SCM_TIMESTAMP, SOL_SOCKET); 1314 if (*mp) 1315 mp = &(*mp)->m_next; 1316 } 1317 #endif 1318 1319 #define IS2292(inp, x, y) (((inp)->inp_flags & IN6P_RFC2292) ? (x) : (y)) 1320 /* RFC 2292 sec. 5 */ 1321 if ((inp->inp_flags & IN6P_PKTINFO) != 0) { 1322 struct in6_pktinfo pi6; 1323 1324 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1325 #ifdef INET 1326 struct ip *ip; 1327 1328 ip = mtod(m, struct ip *); 1329 pi6.ipi6_addr.s6_addr32[0] = 0; 1330 pi6.ipi6_addr.s6_addr32[1] = 0; 1331 pi6.ipi6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP; 1332 pi6.ipi6_addr.s6_addr32[3] = ip->ip_dst.s_addr; 1333 #else 1334 /* We won't hit this code */ 1335 bzero(&pi6.ipi6_addr, sizeof(struct in6_addr)); 1336 #endif 1337 } else { 1338 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr)); 1339 in6_clearscope(&pi6.ipi6_addr); /* XXX */ 1340 } 1341 pi6.ipi6_ifindex = 1342 (m && m->m_pkthdr.rcvif) ? m->m_pkthdr.rcvif->if_index : 0; 1343 1344 *mp = sbcreatecontrol((caddr_t) &pi6, 1345 sizeof(struct in6_pktinfo), 1346 IS2292(inp, IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6); 1347 if (*mp) 1348 mp = &(*mp)->m_next; 1349 } 1350 1351 if ((inp->inp_flags & IN6P_HOPLIMIT) != 0) { 1352 int hlim; 1353 1354 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1355 #ifdef INET 1356 struct ip *ip; 1357 1358 ip = mtod(m, struct ip *); 1359 hlim = ip->ip_ttl; 1360 #else 1361 /* We won't hit this code */ 1362 hlim = 0; 1363 #endif 1364 } else { 1365 hlim = ip6->ip6_hlim & 0xff; 1366 } 1367 *mp = sbcreatecontrol((caddr_t) &hlim, sizeof(int), 1368 IS2292(inp, IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), 1369 IPPROTO_IPV6); 1370 if (*mp) 1371 mp = &(*mp)->m_next; 1372 } 1373 1374 if ((inp->inp_flags & IN6P_TCLASS) != 0) { 1375 int tclass; 1376 1377 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1378 #ifdef INET 1379 struct ip *ip; 1380 1381 ip = mtod(m, struct ip *); 1382 tclass = ip->ip_tos; 1383 #else 1384 /* We won't hit this code */ 1385 tclass = 0; 1386 #endif 1387 } else { 1388 u_int32_t flowinfo; 1389 1390 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK); 1391 flowinfo >>= 20; 1392 tclass = flowinfo & 0xff; 1393 } 1394 *mp = sbcreatecontrol((caddr_t) &tclass, sizeof(int), 1395 IPV6_TCLASS, IPPROTO_IPV6); 1396 if (*mp) 1397 mp = &(*mp)->m_next; 1398 } 1399 1400 if (v4only != NULL) { 1401 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1402 *v4only = 1; 1403 } else { 1404 *v4only = 0; 1405 } 1406 } 1407 1408 return (mp); 1409 } 1410 1411 void 1412 ip6_savecontrol(struct inpcb *in6p, struct mbuf *m, struct mbuf **mp) 1413 { 1414 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1415 int v4only = 0; 1416 1417 mp = ip6_savecontrol_v4(in6p, m, mp, &v4only); 1418 if (v4only) 1419 return; 1420 1421 /* 1422 * IPV6_HOPOPTS socket option. Recall that we required super-user 1423 * privilege for the option (see ip6_ctloutput), but it might be too 1424 * strict, since there might be some hop-by-hop options which can be 1425 * returned to normal user. 1426 * See also RFC 2292 section 6 (or RFC 3542 section 8). 1427 */ 1428 if ((in6p->inp_flags & IN6P_HOPOPTS) != 0) { 1429 /* 1430 * Check if a hop-by-hop options header is contatined in the 1431 * received packet, and if so, store the options as ancillary 1432 * data. Note that a hop-by-hop options header must be 1433 * just after the IPv6 header, which is assured through the 1434 * IPv6 input processing. 1435 */ 1436 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 1437 struct ip6_hbh *hbh; 1438 int hbhlen = 0; 1439 #ifdef PULLDOWN_TEST 1440 struct mbuf *ext; 1441 #endif 1442 1443 #ifndef PULLDOWN_TEST 1444 hbh = (struct ip6_hbh *)(ip6 + 1); 1445 hbhlen = (hbh->ip6h_len + 1) << 3; 1446 #else 1447 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr), 1448 ip6->ip6_nxt); 1449 if (ext == NULL) { 1450 IP6STAT_INC(ip6s_tooshort); 1451 return; 1452 } 1453 hbh = mtod(ext, struct ip6_hbh *); 1454 hbhlen = (hbh->ip6h_len + 1) << 3; 1455 if (hbhlen != ext->m_len) { 1456 m_freem(ext); 1457 IP6STAT_INC(ip6s_tooshort); 1458 return; 1459 } 1460 #endif 1461 1462 /* 1463 * XXX: We copy the whole header even if a 1464 * jumbo payload option is included, the option which 1465 * is to be removed before returning according to 1466 * RFC2292. 1467 * Note: this constraint is removed in RFC3542 1468 */ 1469 *mp = sbcreatecontrol((caddr_t)hbh, hbhlen, 1470 IS2292(in6p, IPV6_2292HOPOPTS, IPV6_HOPOPTS), 1471 IPPROTO_IPV6); 1472 if (*mp) 1473 mp = &(*mp)->m_next; 1474 #ifdef PULLDOWN_TEST 1475 m_freem(ext); 1476 #endif 1477 } 1478 } 1479 1480 if ((in6p->inp_flags & (IN6P_RTHDR | IN6P_DSTOPTS)) != 0) { 1481 int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr); 1482 1483 /* 1484 * Search for destination options headers or routing 1485 * header(s) through the header chain, and stores each 1486 * header as ancillary data. 1487 * Note that the order of the headers remains in 1488 * the chain of ancillary data. 1489 */ 1490 while (1) { /* is explicit loop prevention necessary? */ 1491 struct ip6_ext *ip6e = NULL; 1492 int elen; 1493 #ifdef PULLDOWN_TEST 1494 struct mbuf *ext = NULL; 1495 #endif 1496 1497 /* 1498 * if it is not an extension header, don't try to 1499 * pull it from the chain. 1500 */ 1501 switch (nxt) { 1502 case IPPROTO_DSTOPTS: 1503 case IPPROTO_ROUTING: 1504 case IPPROTO_HOPOPTS: 1505 case IPPROTO_AH: /* is it possible? */ 1506 break; 1507 default: 1508 goto loopend; 1509 } 1510 1511 #ifndef PULLDOWN_TEST 1512 if (off + sizeof(*ip6e) > m->m_len) 1513 goto loopend; 1514 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off); 1515 if (nxt == IPPROTO_AH) 1516 elen = (ip6e->ip6e_len + 2) << 2; 1517 else 1518 elen = (ip6e->ip6e_len + 1) << 3; 1519 if (off + elen > m->m_len) 1520 goto loopend; 1521 #else 1522 ext = ip6_pullexthdr(m, off, nxt); 1523 if (ext == NULL) { 1524 IP6STAT_INC(ip6s_tooshort); 1525 return; 1526 } 1527 ip6e = mtod(ext, struct ip6_ext *); 1528 if (nxt == IPPROTO_AH) 1529 elen = (ip6e->ip6e_len + 2) << 2; 1530 else 1531 elen = (ip6e->ip6e_len + 1) << 3; 1532 if (elen != ext->m_len) { 1533 m_freem(ext); 1534 IP6STAT_INC(ip6s_tooshort); 1535 return; 1536 } 1537 #endif 1538 1539 switch (nxt) { 1540 case IPPROTO_DSTOPTS: 1541 if (!(in6p->inp_flags & IN6P_DSTOPTS)) 1542 break; 1543 1544 *mp = sbcreatecontrol((caddr_t)ip6e, elen, 1545 IS2292(in6p, 1546 IPV6_2292DSTOPTS, IPV6_DSTOPTS), 1547 IPPROTO_IPV6); 1548 if (*mp) 1549 mp = &(*mp)->m_next; 1550 break; 1551 case IPPROTO_ROUTING: 1552 if (!(in6p->inp_flags & IN6P_RTHDR)) 1553 break; 1554 1555 *mp = sbcreatecontrol((caddr_t)ip6e, elen, 1556 IS2292(in6p, IPV6_2292RTHDR, IPV6_RTHDR), 1557 IPPROTO_IPV6); 1558 if (*mp) 1559 mp = &(*mp)->m_next; 1560 break; 1561 case IPPROTO_HOPOPTS: 1562 case IPPROTO_AH: /* is it possible? */ 1563 break; 1564 1565 default: 1566 /* 1567 * other cases have been filtered in the above. 1568 * none will visit this case. here we supply 1569 * the code just in case (nxt overwritten or 1570 * other cases). 1571 */ 1572 #ifdef PULLDOWN_TEST 1573 m_freem(ext); 1574 #endif 1575 goto loopend; 1576 1577 } 1578 1579 /* proceed with the next header. */ 1580 off += elen; 1581 nxt = ip6e->ip6e_nxt; 1582 ip6e = NULL; 1583 #ifdef PULLDOWN_TEST 1584 m_freem(ext); 1585 ext = NULL; 1586 #endif 1587 } 1588 loopend: 1589 ; 1590 } 1591 } 1592 #undef IS2292 1593 1594 void 1595 ip6_notify_pmtu(struct inpcb *inp, struct sockaddr_in6 *dst, u_int32_t mtu) 1596 { 1597 struct socket *so; 1598 struct mbuf *m_mtu; 1599 struct ip6_mtuinfo mtuctl; 1600 1601 KASSERT(inp != NULL, ("%s: inp == NULL", __func__)); 1602 /* 1603 * Notify the error by sending IPV6_PATHMTU ancillary data if 1604 * application wanted to know the MTU value. 1605 * NOTE: we notify disconnected sockets, because some udp 1606 * applications keep sending sockets disconnected. 1607 * NOTE: our implementation doesn't notify connected sockets that has 1608 * foreign address that is different than given destination addresses 1609 * (this is permitted by RFC 3542). 1610 */ 1611 if ((inp->inp_flags & IN6P_MTU) == 0 || ( 1612 !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 1613 !IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &dst->sin6_addr))) 1614 return; 1615 1616 mtuctl.ip6m_mtu = mtu; 1617 mtuctl.ip6m_addr = *dst; 1618 if (sa6_recoverscope(&mtuctl.ip6m_addr)) 1619 return; 1620 1621 if ((m_mtu = sbcreatecontrol((caddr_t)&mtuctl, sizeof(mtuctl), 1622 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL) 1623 return; 1624 1625 so = inp->inp_socket; 1626 if (sbappendaddr(&so->so_rcv, (struct sockaddr *)dst, NULL, m_mtu) 1627 == 0) { 1628 m_freem(m_mtu); 1629 /* XXX: should count statistics */ 1630 } else 1631 sorwakeup(so); 1632 } 1633 1634 #ifdef PULLDOWN_TEST 1635 /* 1636 * pull single extension header from mbuf chain. returns single mbuf that 1637 * contains the result, or NULL on error. 1638 */ 1639 static struct mbuf * 1640 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt) 1641 { 1642 struct ip6_ext ip6e; 1643 size_t elen; 1644 struct mbuf *n; 1645 1646 #ifdef DIAGNOSTIC 1647 switch (nxt) { 1648 case IPPROTO_DSTOPTS: 1649 case IPPROTO_ROUTING: 1650 case IPPROTO_HOPOPTS: 1651 case IPPROTO_AH: /* is it possible? */ 1652 break; 1653 default: 1654 printf("ip6_pullexthdr: invalid nxt=%d\n", nxt); 1655 } 1656 #endif 1657 1658 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1659 if (nxt == IPPROTO_AH) 1660 elen = (ip6e.ip6e_len + 2) << 2; 1661 else 1662 elen = (ip6e.ip6e_len + 1) << 3; 1663 1664 if (elen > MLEN) 1665 n = m_getcl(M_NOWAIT, MT_DATA, 0); 1666 else 1667 n = m_get(M_NOWAIT, MT_DATA); 1668 if (n == NULL) 1669 return NULL; 1670 1671 m_copydata(m, off, elen, mtod(n, caddr_t)); 1672 n->m_len = elen; 1673 return n; 1674 } 1675 #endif 1676 1677 /* 1678 * Get pointer to the previous header followed by the header 1679 * currently processed. 1680 * XXX: This function supposes that 1681 * M includes all headers, 1682 * the next header field and the header length field of each header 1683 * are valid, and 1684 * the sum of each header length equals to OFF. 1685 * Because of these assumptions, this function must be called very 1686 * carefully. Moreover, it will not be used in the near future when 1687 * we develop `neater' mechanism to process extension headers. 1688 */ 1689 char * 1690 ip6_get_prevhdr(struct mbuf *m, int off) 1691 { 1692 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1693 1694 if (off == sizeof(struct ip6_hdr)) 1695 return (&ip6->ip6_nxt); 1696 else { 1697 int len, nxt; 1698 struct ip6_ext *ip6e = NULL; 1699 1700 nxt = ip6->ip6_nxt; 1701 len = sizeof(struct ip6_hdr); 1702 while (len < off) { 1703 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len); 1704 1705 switch (nxt) { 1706 case IPPROTO_FRAGMENT: 1707 len += sizeof(struct ip6_frag); 1708 break; 1709 case IPPROTO_AH: 1710 len += (ip6e->ip6e_len + 2) << 2; 1711 break; 1712 default: 1713 len += (ip6e->ip6e_len + 1) << 3; 1714 break; 1715 } 1716 nxt = ip6e->ip6e_nxt; 1717 } 1718 if (ip6e) 1719 return (&ip6e->ip6e_nxt); 1720 else 1721 return NULL; 1722 } 1723 } 1724 1725 /* 1726 * get next header offset. m will be retained. 1727 */ 1728 int 1729 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp) 1730 { 1731 struct ip6_hdr ip6; 1732 struct ip6_ext ip6e; 1733 struct ip6_frag fh; 1734 1735 /* just in case */ 1736 if (m == NULL) 1737 panic("ip6_nexthdr: m == NULL"); 1738 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off) 1739 return -1; 1740 1741 switch (proto) { 1742 case IPPROTO_IPV6: 1743 if (m->m_pkthdr.len < off + sizeof(ip6)) 1744 return -1; 1745 m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6); 1746 if (nxtp) 1747 *nxtp = ip6.ip6_nxt; 1748 off += sizeof(ip6); 1749 return off; 1750 1751 case IPPROTO_FRAGMENT: 1752 /* 1753 * terminate parsing if it is not the first fragment, 1754 * it does not make sense to parse through it. 1755 */ 1756 if (m->m_pkthdr.len < off + sizeof(fh)) 1757 return -1; 1758 m_copydata(m, off, sizeof(fh), (caddr_t)&fh); 1759 /* IP6F_OFF_MASK = 0xfff8(BigEndian), 0xf8ff(LittleEndian) */ 1760 if (fh.ip6f_offlg & IP6F_OFF_MASK) 1761 return -1; 1762 if (nxtp) 1763 *nxtp = fh.ip6f_nxt; 1764 off += sizeof(struct ip6_frag); 1765 return off; 1766 1767 case IPPROTO_AH: 1768 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1769 return -1; 1770 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1771 if (nxtp) 1772 *nxtp = ip6e.ip6e_nxt; 1773 off += (ip6e.ip6e_len + 2) << 2; 1774 return off; 1775 1776 case IPPROTO_HOPOPTS: 1777 case IPPROTO_ROUTING: 1778 case IPPROTO_DSTOPTS: 1779 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1780 return -1; 1781 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1782 if (nxtp) 1783 *nxtp = ip6e.ip6e_nxt; 1784 off += (ip6e.ip6e_len + 1) << 3; 1785 return off; 1786 1787 case IPPROTO_NONE: 1788 case IPPROTO_ESP: 1789 case IPPROTO_IPCOMP: 1790 /* give up */ 1791 return -1; 1792 1793 default: 1794 return -1; 1795 } 1796 1797 return -1; 1798 } 1799 1800 /* 1801 * get offset for the last header in the chain. m will be kept untainted. 1802 */ 1803 int 1804 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp) 1805 { 1806 int newoff; 1807 int nxt; 1808 1809 if (!nxtp) { 1810 nxt = -1; 1811 nxtp = &nxt; 1812 } 1813 while (1) { 1814 newoff = ip6_nexthdr(m, off, proto, nxtp); 1815 if (newoff < 0) 1816 return off; 1817 else if (newoff < off) 1818 return -1; /* invalid */ 1819 else if (newoff == off) 1820 return newoff; 1821 1822 off = newoff; 1823 proto = *nxtp; 1824 } 1825 } 1826 1827 static struct ip6aux * 1828 ip6_addaux(struct mbuf *m) 1829 { 1830 struct m_tag *mtag; 1831 1832 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL); 1833 if (!mtag) { 1834 mtag = m_tag_get(PACKET_TAG_IPV6_INPUT, sizeof(struct ip6aux), 1835 M_NOWAIT); 1836 if (mtag) { 1837 m_tag_prepend(m, mtag); 1838 bzero(mtag + 1, sizeof(struct ip6aux)); 1839 } 1840 } 1841 return mtag ? (struct ip6aux *)(mtag + 1) : NULL; 1842 } 1843 1844 static struct ip6aux * 1845 ip6_findaux(struct mbuf *m) 1846 { 1847 struct m_tag *mtag; 1848 1849 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL); 1850 return mtag ? (struct ip6aux *)(mtag + 1) : NULL; 1851 } 1852 1853 static void 1854 ip6_delaux(struct mbuf *m) 1855 { 1856 struct m_tag *mtag; 1857 1858 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL); 1859 if (mtag) 1860 m_tag_delete(m, mtag); 1861 } 1862 1863 /* 1864 * System control for IP6 1865 */ 1866 1867 u_char inet6ctlerrmap[PRC_NCMDS] = { 1868 0, 0, 0, 0, 1869 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 1870 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 1871 EMSGSIZE, EHOSTUNREACH, 0, 0, 1872 0, 0, 0, 0, 1873 ENOPROTOOPT 1874 };
Cache object: 6d180726bb1a9a3e98b404b10bd59e58
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