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_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_var.h> 90 #include <net/if_types.h> 91 #include <net/if_dl.h> 92 #include <net/route.h> 93 #include <net/netisr.h> 94 #include <net/pfil.h> 95 #include <net/vnet.h> 96 97 #include <netinet/in.h> 98 #include <netinet/in_kdtrace.h> 99 #include <netinet/ip_var.h> 100 #include <netinet/in_systm.h> 101 #include <net/if_llatbl.h> 102 #ifdef INET 103 #include <netinet/ip.h> 104 #include <netinet/ip_icmp.h> 105 #endif /* INET */ 106 #include <netinet/ip6.h> 107 #include <netinet6/in6_var.h> 108 #include <netinet6/ip6_var.h> 109 #include <netinet/in_pcb.h> 110 #include <netinet/icmp6.h> 111 #include <netinet6/scope6_var.h> 112 #include <netinet6/in6_ifattach.h> 113 #include <netinet6/nd6.h> 114 115 #ifdef IPSEC 116 #include <netipsec/ipsec.h> 117 #include <netinet6/ip6_ipsec.h> 118 #include <netipsec/ipsec6.h> 119 #endif /* IPSEC */ 120 121 #include <netinet6/ip6protosw.h> 122 123 #ifdef FLOWTABLE 124 #include <net/flowtable.h> 125 VNET_DECLARE(int, ip6_output_flowtable_size); 126 #define V_ip6_output_flowtable_size VNET(ip6_output_flowtable_size) 127 #endif 128 129 extern struct domain inet6domain; 130 131 u_char ip6_protox[IPPROTO_MAX]; 132 VNET_DEFINE(struct in6_ifaddrhead, in6_ifaddrhead); 133 VNET_DEFINE(struct in6_ifaddrlisthead *, in6_ifaddrhashtbl); 134 VNET_DEFINE(u_long, in6_ifaddrhmask); 135 136 static struct netisr_handler ip6_nh = { 137 .nh_name = "ip6", 138 .nh_handler = ip6_input, 139 .nh_proto = NETISR_IPV6, 140 .nh_policy = NETISR_POLICY_FLOW, 141 }; 142 143 VNET_DECLARE(struct callout, in6_tmpaddrtimer_ch); 144 #define V_in6_tmpaddrtimer_ch VNET(in6_tmpaddrtimer_ch) 145 146 VNET_DEFINE(struct pfil_head, inet6_pfil_hook); 147 148 VNET_PCPUSTAT_DEFINE(struct ip6stat, ip6stat); 149 VNET_PCPUSTAT_SYSINIT(ip6stat); 150 #ifdef VIMAGE 151 VNET_PCPUSTAT_SYSUNINIT(ip6stat); 152 #endif /* VIMAGE */ 153 154 struct rwlock in6_ifaddr_lock; 155 RW_SYSINIT(in6_ifaddr_lock, &in6_ifaddr_lock, "in6_ifaddr_lock"); 156 157 static void ip6_init2(void *); 158 static struct ip6aux *ip6_setdstifaddr(struct mbuf *, struct in6_ifaddr *); 159 static struct ip6aux *ip6_addaux(struct mbuf *); 160 static struct ip6aux *ip6_findaux(struct mbuf *m); 161 static void ip6_delaux (struct mbuf *); 162 static int ip6_hopopts_input(u_int32_t *, u_int32_t *, struct mbuf **, int *); 163 #ifdef PULLDOWN_TEST 164 static struct mbuf *ip6_pullexthdr(struct mbuf *, size_t, int); 165 #endif 166 167 /* 168 * IP6 initialization: fill in IP6 protocol switch table. 169 * All protocols not implemented in kernel go to raw IP6 protocol handler. 170 */ 171 void 172 ip6_init(void) 173 { 174 struct ip6protosw *pr; 175 int i; 176 177 TUNABLE_INT_FETCH("net.inet6.ip6.auto_linklocal", 178 &V_ip6_auto_linklocal); 179 TUNABLE_INT_FETCH("net.inet6.ip6.accept_rtadv", &V_ip6_accept_rtadv); 180 TUNABLE_INT_FETCH("net.inet6.ip6.no_radr", &V_ip6_no_radr); 181 182 TAILQ_INIT(&V_in6_ifaddrhead); 183 V_in6_ifaddrhashtbl = hashinit(IN6ADDR_NHASH, M_IFADDR, 184 &V_in6_ifaddrhmask); 185 186 /* Initialize packet filter hooks. */ 187 V_inet6_pfil_hook.ph_type = PFIL_TYPE_AF; 188 V_inet6_pfil_hook.ph_af = AF_INET6; 189 if ((i = pfil_head_register(&V_inet6_pfil_hook)) != 0) 190 printf("%s: WARNING: unable to register pfil hook, " 191 "error %d\n", __func__, i); 192 193 scope6_init(); 194 addrsel_policy_init(); 195 nd6_init(); 196 frag6_init(); 197 198 #ifdef FLOWTABLE 199 if (TUNABLE_INT_FETCH("net.inet6.ip6.output_flowtable_size", 200 &V_ip6_output_flowtable_size)) { 201 if (V_ip6_output_flowtable_size < 256) 202 V_ip6_output_flowtable_size = 256; 203 if (!powerof2(V_ip6_output_flowtable_size)) { 204 printf("flowtable must be power of 2 size\n"); 205 V_ip6_output_flowtable_size = 2048; 206 } 207 } else { 208 /* 209 * round up to the next power of 2 210 */ 211 V_ip6_output_flowtable_size = 1 << fls((1024 + maxusers * 64)-1); 212 } 213 V_ip6_ft = flowtable_alloc("ipv6", V_ip6_output_flowtable_size, FL_IPV6|FL_PCPU); 214 #endif 215 216 V_ip6_desync_factor = arc4random() % MAX_TEMP_DESYNC_FACTOR; 217 218 /* Skip global initialization stuff for non-default instances. */ 219 if (!IS_DEFAULT_VNET(curvnet)) 220 return; 221 222 #ifdef DIAGNOSTIC 223 if (sizeof(struct protosw) != sizeof(struct ip6protosw)) 224 panic("sizeof(protosw) != sizeof(ip6protosw)"); 225 #endif 226 pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 227 if (pr == NULL) 228 panic("ip6_init"); 229 230 /* Initialize the entire ip6_protox[] array to IPPROTO_RAW. */ 231 for (i = 0; i < IPPROTO_MAX; i++) 232 ip6_protox[i] = pr - inet6sw; 233 /* 234 * Cycle through IP protocols and put them into the appropriate place 235 * in ip6_protox[]. 236 */ 237 for (pr = (struct ip6protosw *)inet6domain.dom_protosw; 238 pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++) 239 if (pr->pr_domain->dom_family == PF_INET6 && 240 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) { 241 /* Be careful to only index valid IP protocols. */ 242 if (pr->pr_protocol < IPPROTO_MAX) 243 ip6_protox[pr->pr_protocol] = pr - inet6sw; 244 } 245 246 netisr_register(&ip6_nh); 247 } 248 249 /* 250 * The protocol to be inserted into ip6_protox[] must be already registered 251 * in inet6sw[], either statically or through pf_proto_register(). 252 */ 253 int 254 ip6proto_register(short ip6proto) 255 { 256 struct ip6protosw *pr; 257 258 /* Sanity checks. */ 259 if (ip6proto <= 0 || ip6proto >= IPPROTO_MAX) 260 return (EPROTONOSUPPORT); 261 262 /* 263 * The protocol slot must not be occupied by another protocol 264 * already. An index pointing to IPPROTO_RAW is unused. 265 */ 266 pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 267 if (pr == NULL) 268 return (EPFNOSUPPORT); 269 if (ip6_protox[ip6proto] != pr - inet6sw) /* IPPROTO_RAW */ 270 return (EEXIST); 271 272 /* 273 * Find the protocol position in inet6sw[] and set the index. 274 */ 275 for (pr = (struct ip6protosw *)inet6domain.dom_protosw; 276 pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++) { 277 if (pr->pr_domain->dom_family == PF_INET6 && 278 pr->pr_protocol && pr->pr_protocol == ip6proto) { 279 ip6_protox[pr->pr_protocol] = pr - inet6sw; 280 return (0); 281 } 282 } 283 return (EPROTONOSUPPORT); 284 } 285 286 int 287 ip6proto_unregister(short ip6proto) 288 { 289 struct ip6protosw *pr; 290 291 /* Sanity checks. */ 292 if (ip6proto <= 0 || ip6proto >= IPPROTO_MAX) 293 return (EPROTONOSUPPORT); 294 295 /* Check if the protocol was indeed registered. */ 296 pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 297 if (pr == NULL) 298 return (EPFNOSUPPORT); 299 if (ip6_protox[ip6proto] == pr - inet6sw) /* IPPROTO_RAW */ 300 return (ENOENT); 301 302 /* Reset the protocol slot to IPPROTO_RAW. */ 303 ip6_protox[ip6proto] = pr - inet6sw; 304 return (0); 305 } 306 307 #ifdef VIMAGE 308 void 309 ip6_destroy() 310 { 311 int i; 312 313 if ((i = pfil_head_unregister(&V_inet6_pfil_hook)) != 0) 314 printf("%s: WARNING: unable to unregister pfil hook, " 315 "error %d\n", __func__, i); 316 hashdestroy(V_in6_ifaddrhashtbl, M_IFADDR, V_in6_ifaddrhmask); 317 nd6_destroy(); 318 callout_drain(&V_in6_tmpaddrtimer_ch); 319 } 320 #endif 321 322 static int 323 ip6_init2_vnet(const void *unused __unused) 324 { 325 326 /* nd6_timer_init */ 327 callout_init(&V_nd6_timer_ch, 0); 328 callout_reset(&V_nd6_timer_ch, hz, nd6_timer, curvnet); 329 330 /* timer for regeneranation of temporary addresses randomize ID */ 331 callout_init(&V_in6_tmpaddrtimer_ch, 0); 332 callout_reset(&V_in6_tmpaddrtimer_ch, 333 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor - 334 V_ip6_temp_regen_advance) * hz, 335 in6_tmpaddrtimer, curvnet); 336 337 return (0); 338 } 339 340 static void 341 ip6_init2(void *dummy) 342 { 343 344 ip6_init2_vnet(NULL); 345 } 346 347 /* cheat */ 348 /* This must be after route_init(), which is now SI_ORDER_THIRD */ 349 SYSINIT(netinet6init2, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ip6_init2, NULL); 350 351 static int 352 ip6_input_hbh(struct mbuf *m, uint32_t *plen, uint32_t *rtalert, int *off, 353 int *nxt, int *ours) 354 { 355 struct ip6_hdr *ip6; 356 struct ip6_hbh *hbh; 357 358 if (ip6_hopopts_input(plen, rtalert, &m, off)) { 359 #if 0 /*touches NULL pointer*/ 360 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 361 #endif 362 goto out; /* m have already been freed */ 363 } 364 365 /* adjust pointer */ 366 ip6 = mtod(m, struct ip6_hdr *); 367 368 /* 369 * if the payload length field is 0 and the next header field 370 * indicates Hop-by-Hop Options header, then a Jumbo Payload 371 * option MUST be included. 372 */ 373 if (ip6->ip6_plen == 0 && *plen == 0) { 374 /* 375 * Note that if a valid jumbo payload option is 376 * contained, ip6_hopopts_input() must set a valid 377 * (non-zero) payload length to the variable plen. 378 */ 379 IP6STAT_INC(ip6s_badoptions); 380 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 381 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 382 icmp6_error(m, ICMP6_PARAM_PROB, 383 ICMP6_PARAMPROB_HEADER, 384 (caddr_t)&ip6->ip6_plen - (caddr_t)ip6); 385 goto out; 386 } 387 #ifndef PULLDOWN_TEST 388 /* ip6_hopopts_input() ensures that mbuf is contiguous */ 389 hbh = (struct ip6_hbh *)(ip6 + 1); 390 #else 391 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 392 sizeof(struct ip6_hbh)); 393 if (hbh == NULL) { 394 IP6STAT_INC(ip6s_tooshort); 395 goto out; 396 } 397 #endif 398 *nxt = hbh->ip6h_nxt; 399 400 /* 401 * If we are acting as a router and the packet contains a 402 * router alert option, see if we know the option value. 403 * Currently, we only support the option value for MLD, in which 404 * case we should pass the packet to the multicast routing 405 * daemon. 406 */ 407 if (*rtalert != ~0) { 408 switch (*rtalert) { 409 case IP6OPT_RTALERT_MLD: 410 if (V_ip6_forwarding) 411 *ours = 1; 412 break; 413 default: 414 /* 415 * RFC2711 requires unrecognized values must be 416 * silently ignored. 417 */ 418 break; 419 } 420 } 421 422 return (0); 423 424 out: 425 return (1); 426 } 427 428 void 429 ip6_input(struct mbuf *m) 430 { 431 struct ip6_hdr *ip6; 432 int off = sizeof(struct ip6_hdr), nest; 433 u_int32_t plen; 434 u_int32_t rtalert = ~0; 435 int nxt, ours = 0; 436 struct ifnet *deliverifp = NULL, *ifp = NULL; 437 struct in6_addr odst; 438 struct route_in6 rin6; 439 int srcrt = 0; 440 struct llentry *lle = NULL; 441 struct sockaddr_in6 dst6, *dst; 442 443 bzero(&rin6, sizeof(struct route_in6)); 444 #ifdef IPSEC 445 /* 446 * should the inner packet be considered authentic? 447 * see comment in ah4_input(). 448 * NB: m cannot be NULL when passed to the input routine 449 */ 450 451 m->m_flags &= ~M_AUTHIPHDR; 452 m->m_flags &= ~M_AUTHIPDGM; 453 454 #endif /* IPSEC */ 455 456 /* 457 * make sure we don't have onion peering information into m_tag. 458 */ 459 ip6_delaux(m); 460 461 if (m->m_flags & M_FASTFWD_OURS) { 462 /* 463 * Firewall changed destination to local. 464 */ 465 m->m_flags &= ~M_FASTFWD_OURS; 466 ours = 1; 467 deliverifp = m->m_pkthdr.rcvif; 468 ip6 = mtod(m, struct ip6_hdr *); 469 goto hbhcheck; 470 } 471 472 /* 473 * mbuf statistics 474 */ 475 if (m->m_flags & M_EXT) { 476 if (m->m_next) 477 IP6STAT_INC(ip6s_mext2m); 478 else 479 IP6STAT_INC(ip6s_mext1); 480 } else { 481 if (m->m_next) { 482 if (m->m_flags & M_LOOP) { 483 IP6STAT_INC(ip6s_m2m[V_loif->if_index]); 484 } else if (m->m_pkthdr.rcvif->if_index < IP6S_M2MMAX) 485 IP6STAT_INC( 486 ip6s_m2m[m->m_pkthdr.rcvif->if_index]); 487 else 488 IP6STAT_INC(ip6s_m2m[0]); 489 } else 490 IP6STAT_INC(ip6s_m1); 491 } 492 493 /* drop the packet if IPv6 operation is disabled on the IF */ 494 if ((ND_IFINFO(m->m_pkthdr.rcvif)->flags & ND6_IFF_IFDISABLED)) { 495 m_freem(m); 496 return; 497 } 498 499 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive); 500 IP6STAT_INC(ip6s_total); 501 502 #ifndef PULLDOWN_TEST 503 /* 504 * L2 bridge code and some other code can return mbuf chain 505 * that does not conform to KAME requirement. too bad. 506 * XXX: fails to join if interface MTU > MCLBYTES. jumbogram? 507 */ 508 if (m && m->m_next != NULL && m->m_pkthdr.len < MCLBYTES) { 509 struct mbuf *n; 510 511 if (m->m_pkthdr.len > MHLEN) 512 n = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 513 else 514 n = m_gethdr(M_NOWAIT, MT_DATA); 515 if (n == NULL) { 516 m_freem(m); 517 return; /* ENOBUFS */ 518 } 519 520 m_move_pkthdr(n, m); 521 m_copydata(m, 0, n->m_pkthdr.len, mtod(n, caddr_t)); 522 n->m_len = n->m_pkthdr.len; 523 m_freem(m); 524 m = n; 525 } 526 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), /* nothing */); 527 #endif 528 529 if (m->m_len < sizeof(struct ip6_hdr)) { 530 struct ifnet *inifp; 531 inifp = m->m_pkthdr.rcvif; 532 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 533 IP6STAT_INC(ip6s_toosmall); 534 in6_ifstat_inc(inifp, ifs6_in_hdrerr); 535 return; 536 } 537 } 538 539 ip6 = mtod(m, struct ip6_hdr *); 540 541 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 542 IP6STAT_INC(ip6s_badvers); 543 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 544 goto bad; 545 } 546 547 IP6STAT_INC(ip6s_nxthist[ip6->ip6_nxt]); 548 549 IP_PROBE(receive, NULL, NULL, ip6, m->m_pkthdr.rcvif, NULL, ip6); 550 551 /* 552 * Check against address spoofing/corruption. 553 */ 554 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) || 555 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) { 556 /* 557 * XXX: "badscope" is not very suitable for a multicast source. 558 */ 559 IP6STAT_INC(ip6s_badscope); 560 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 561 goto bad; 562 } 563 if (IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) && 564 !(m->m_flags & M_LOOP)) { 565 /* 566 * In this case, the packet should come from the loopback 567 * interface. However, we cannot just check the if_flags, 568 * because ip6_mloopback() passes the "actual" interface 569 * as the outgoing/incoming interface. 570 */ 571 IP6STAT_INC(ip6s_badscope); 572 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 573 goto bad; 574 } 575 576 #ifdef ALTQ 577 if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) { 578 /* packet is dropped by traffic conditioner */ 579 return; 580 } 581 #endif 582 /* 583 * The following check is not documented in specs. A malicious 584 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack 585 * and bypass security checks (act as if it was from 127.0.0.1 by using 586 * IPv6 src ::ffff:127.0.0.1). Be cautious. 587 * 588 * This check chokes if we are in an SIIT cloud. As none of BSDs 589 * support IPv4-less kernel compilation, we cannot support SIIT 590 * environment at all. So, it makes more sense for us to reject any 591 * malicious packets for non-SIIT environment, than try to do a 592 * partial support for SIIT environment. 593 */ 594 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 595 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 596 IP6STAT_INC(ip6s_badscope); 597 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 598 goto bad; 599 } 600 #if 0 601 /* 602 * Reject packets with IPv4 compatible addresses (auto tunnel). 603 * 604 * The code forbids auto tunnel relay case in RFC1933 (the check is 605 * stronger than RFC1933). We may want to re-enable it if mech-xx 606 * is revised to forbid relaying case. 607 */ 608 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) || 609 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) { 610 IP6STAT_INC(ip6s_badscope); 611 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 612 goto bad; 613 } 614 #endif 615 #ifdef IPSEC 616 /* 617 * Bypass packet filtering for packets previously handled by IPsec. 618 */ 619 if (ip6_ipsec_filtertunnel(m)) 620 goto passin; 621 #endif /* IPSEC */ 622 623 /* 624 * Run through list of hooks for input packets. 625 * 626 * NB: Beware of the destination address changing 627 * (e.g. by NAT rewriting). When this happens, 628 * tell ip6_forward to do the right thing. 629 */ 630 odst = ip6->ip6_dst; 631 632 /* Jump over all PFIL processing if hooks are not active. */ 633 if (!PFIL_HOOKED(&V_inet6_pfil_hook)) 634 goto passin; 635 636 if (pfil_run_hooks(&V_inet6_pfil_hook, &m, 637 m->m_pkthdr.rcvif, PFIL_IN, NULL)) 638 return; 639 if (m == NULL) /* consumed by filter */ 640 return; 641 ip6 = mtod(m, struct ip6_hdr *); 642 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst); 643 644 if (m->m_flags & M_FASTFWD_OURS) { 645 m->m_flags &= ~M_FASTFWD_OURS; 646 ours = 1; 647 deliverifp = m->m_pkthdr.rcvif; 648 goto hbhcheck; 649 } 650 if ((m->m_flags & M_IP6_NEXTHOP) && 651 m_tag_find(m, PACKET_TAG_IPFORWARD, NULL) != NULL) { 652 /* 653 * Directly ship the packet on. This allows forwarding 654 * packets originally destined to us to some other directly 655 * connected host. 656 */ 657 ip6_forward(m, 1); 658 goto out; 659 } 660 661 passin: 662 /* 663 * Disambiguate address scope zones (if there is ambiguity). 664 * We first make sure that the original source or destination address 665 * is not in our internal form for scoped addresses. Such addresses 666 * are not necessarily invalid spec-wise, but we cannot accept them due 667 * to the usage conflict. 668 * in6_setscope() then also checks and rejects the cases where src or 669 * dst are the loopback address and the receiving interface 670 * is not loopback. 671 */ 672 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) { 673 IP6STAT_INC(ip6s_badscope); /* XXX */ 674 goto bad; 675 } 676 if (in6_setscope(&ip6->ip6_src, m->m_pkthdr.rcvif, NULL) || 677 in6_setscope(&ip6->ip6_dst, m->m_pkthdr.rcvif, NULL)) { 678 IP6STAT_INC(ip6s_badscope); 679 goto bad; 680 } 681 682 /* 683 * Multicast check. Assume packet is for us to avoid 684 * prematurely taking locks. 685 */ 686 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 687 ours = 1; 688 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast); 689 deliverifp = m->m_pkthdr.rcvif; 690 goto hbhcheck; 691 } 692 693 /* 694 * Unicast check 695 */ 696 697 bzero(&dst6, sizeof(dst6)); 698 dst6.sin6_family = AF_INET6; 699 dst6.sin6_len = sizeof(struct sockaddr_in6); 700 dst6.sin6_addr = ip6->ip6_dst; 701 ifp = m->m_pkthdr.rcvif; 702 IF_AFDATA_RLOCK(ifp); 703 lle = lla_lookup(LLTABLE6(ifp), 0, 704 (struct sockaddr *)&dst6); 705 IF_AFDATA_RUNLOCK(ifp); 706 if ((lle != NULL) && (lle->la_flags & LLE_IFADDR)) { 707 struct ifaddr *ifa; 708 struct in6_ifaddr *ia6; 709 int bad; 710 711 bad = 1; 712 #define sa_equal(a1, a2) \ 713 (bcmp((a1), (a2), ((a1))->sin6_len) == 0) 714 IF_ADDR_RLOCK(ifp); 715 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 716 if (ifa->ifa_addr->sa_family != dst6.sin6_family) 717 continue; 718 if (sa_equal(&dst6, ifa->ifa_addr)) 719 break; 720 } 721 KASSERT(ifa != NULL, ("%s: ifa not found for lle %p", 722 __func__, lle)); 723 #undef sa_equal 724 725 ia6 = (struct in6_ifaddr *)ifa; 726 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) { 727 /* Count the packet in the ip address stats */ 728 counter_u64_add(ia6->ia_ifa.ifa_ipackets, 1); 729 counter_u64_add(ia6->ia_ifa.ifa_ibytes, 730 m->m_pkthdr.len); 731 732 /* 733 * record address information into m_tag. 734 */ 735 (void)ip6_setdstifaddr(m, ia6); 736 737 bad = 0; 738 } else { 739 char ip6bufs[INET6_ADDRSTRLEN]; 740 char ip6bufd[INET6_ADDRSTRLEN]; 741 /* address is not ready, so discard the packet. */ 742 nd6log((LOG_INFO, 743 "ip6_input: packet to an unready address %s->%s\n", 744 ip6_sprintf(ip6bufs, &ip6->ip6_src), 745 ip6_sprintf(ip6bufd, &ip6->ip6_dst))); 746 } 747 IF_ADDR_RUNLOCK(ifp); 748 LLE_RUNLOCK(lle); 749 if (bad) 750 goto bad; 751 else { 752 ours = 1; 753 deliverifp = ifp; 754 goto hbhcheck; 755 } 756 } 757 if (lle != NULL) 758 LLE_RUNLOCK(lle); 759 760 dst = &rin6.ro_dst; 761 dst->sin6_len = sizeof(struct sockaddr_in6); 762 dst->sin6_family = AF_INET6; 763 dst->sin6_addr = ip6->ip6_dst; 764 rin6.ro_rt = in6_rtalloc1((struct sockaddr *)dst, 0, 0, M_GETFIB(m)); 765 if (rin6.ro_rt) 766 RT_UNLOCK(rin6.ro_rt); 767 768 #define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key)) 769 770 /* 771 * Accept the packet if the forwarding interface to the destination 772 * according to the routing table is the loopback interface, 773 * unless the associated route has a gateway. 774 * Note that this approach causes to accept a packet if there is a 775 * route to the loopback interface for the destination of the packet. 776 * But we think it's even useful in some situations, e.g. when using 777 * a special daemon which wants to intercept the packet. 778 * 779 * XXX: some OSes automatically make a cloned route for the destination 780 * of an outgoing packet. If the outgoing interface of the packet 781 * is a loopback one, the kernel would consider the packet to be 782 * accepted, even if we have no such address assinged on the interface. 783 * We check the cloned flag of the route entry to reject such cases, 784 * assuming that route entries for our own addresses are not made by 785 * cloning (it should be true because in6_addloop explicitly installs 786 * the host route). However, we might have to do an explicit check 787 * while it would be less efficient. Or, should we rather install a 788 * reject route for such a case? 789 */ 790 if (rin6.ro_rt && 791 (rin6.ro_rt->rt_flags & 792 (RTF_HOST|RTF_GATEWAY)) == RTF_HOST && 793 #ifdef RTF_WASCLONED 794 !(rin6.ro_rt->rt_flags & RTF_WASCLONED) && 795 #endif 796 #ifdef RTF_CLONED 797 !(rin6.ro_rt->rt_flags & RTF_CLONED) && 798 #endif 799 #if 0 800 /* 801 * The check below is redundant since the comparison of 802 * the destination and the key of the rtentry has 803 * already done through looking up the routing table. 804 */ 805 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 806 &rt6_key(rin6.ro_rt)->sin6_addr) 807 #endif 808 rin6.ro_rt->rt_ifp->if_type == IFT_LOOP) { 809 int free_ia6 = 0; 810 struct in6_ifaddr *ia6; 811 812 /* 813 * found the loopback route to the interface address 814 */ 815 if (rin6.ro_rt->rt_gateway->sa_family == AF_LINK) { 816 struct sockaddr_in6 dest6; 817 818 bzero(&dest6, sizeof(dest6)); 819 dest6.sin6_family = AF_INET6; 820 dest6.sin6_len = sizeof(dest6); 821 dest6.sin6_addr = ip6->ip6_dst; 822 ia6 = (struct in6_ifaddr *) 823 ifa_ifwithaddr((struct sockaddr *)&dest6); 824 if (ia6 == NULL) 825 goto bad; 826 free_ia6 = 1; 827 } 828 else 829 ia6 = (struct in6_ifaddr *)rin6.ro_rt->rt_ifa; 830 831 /* 832 * record address information into m_tag. 833 */ 834 (void)ip6_setdstifaddr(m, ia6); 835 836 /* 837 * packets to a tentative, duplicated, or somehow invalid 838 * address must not be accepted. 839 */ 840 if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) { 841 /* this address is ready */ 842 ours = 1; 843 deliverifp = ia6->ia_ifp; /* correct? */ 844 /* Count the packet in the ip address stats */ 845 counter_u64_add(ia6->ia_ifa.ifa_ipackets, 1); 846 counter_u64_add(ia6->ia_ifa.ifa_ibytes, 847 m->m_pkthdr.len); 848 if (free_ia6) 849 ifa_free(&ia6->ia_ifa); 850 goto hbhcheck; 851 } else { 852 char ip6bufs[INET6_ADDRSTRLEN]; 853 char ip6bufd[INET6_ADDRSTRLEN]; 854 /* address is not ready, so discard the packet. */ 855 nd6log((LOG_INFO, 856 "ip6_input: packet to an unready address %s->%s\n", 857 ip6_sprintf(ip6bufs, &ip6->ip6_src), 858 ip6_sprintf(ip6bufd, &ip6->ip6_dst))); 859 860 if (free_ia6) 861 ifa_free(&ia6->ia_ifa); 862 goto bad; 863 } 864 } 865 866 /* 867 * FAITH (Firewall Aided Internet Translator) 868 */ 869 if (V_ip6_keepfaith) { 870 if (rin6.ro_rt && rin6.ro_rt->rt_ifp && 871 rin6.ro_rt->rt_ifp->if_type == IFT_FAITH) { 872 /* XXX do we need more sanity checks? */ 873 ours = 1; 874 deliverifp = rin6.ro_rt->rt_ifp; /* faith */ 875 goto hbhcheck; 876 } 877 } 878 879 /* 880 * Now there is no reason to process the packet if it's not our own 881 * and we're not a router. 882 */ 883 if (!V_ip6_forwarding) { 884 IP6STAT_INC(ip6s_cantforward); 885 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 886 goto bad; 887 } 888 889 hbhcheck: 890 /* 891 * record address information into m_tag, if we don't have one yet. 892 * note that we are unable to record it, if the address is not listed 893 * as our interface address (e.g. multicast addresses, addresses 894 * within FAITH prefixes and such). 895 */ 896 if (deliverifp) { 897 struct in6_ifaddr *ia6; 898 899 if ((ia6 = ip6_getdstifaddr(m)) != NULL) { 900 ifa_free(&ia6->ia_ifa); 901 } else { 902 ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 903 if (ia6) { 904 if (!ip6_setdstifaddr(m, ia6)) { 905 /* 906 * XXX maybe we should drop the packet here, 907 * as we could not provide enough information 908 * to the upper layers. 909 */ 910 } 911 ifa_free(&ia6->ia_ifa); 912 } 913 } 914 } 915 916 /* 917 * Process Hop-by-Hop options header if it's contained. 918 * m may be modified in ip6_hopopts_input(). 919 * If a JumboPayload option is included, plen will also be modified. 920 */ 921 plen = (u_int32_t)ntohs(ip6->ip6_plen); 922 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 923 int error; 924 925 error = ip6_input_hbh(m, &plen, &rtalert, &off, &nxt, &ours); 926 if (error != 0) 927 goto out; 928 } else 929 nxt = ip6->ip6_nxt; 930 931 /* 932 * Check that the amount of data in the buffers 933 * is as at least much as the IPv6 header would have us expect. 934 * Trim mbufs if longer than we expect. 935 * Drop packet if shorter than we expect. 936 */ 937 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 938 IP6STAT_INC(ip6s_tooshort); 939 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 940 goto bad; 941 } 942 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 943 if (m->m_len == m->m_pkthdr.len) { 944 m->m_len = sizeof(struct ip6_hdr) + plen; 945 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 946 } else 947 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 948 } 949 950 /* 951 * Forward if desirable. 952 */ 953 if (V_ip6_mrouter && 954 IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 955 /* 956 * If we are acting as a multicast router, all 957 * incoming multicast packets are passed to the 958 * kernel-level multicast forwarding function. 959 * The packet is returned (relatively) intact; if 960 * ip6_mforward() returns a non-zero value, the packet 961 * must be discarded, else it may be accepted below. 962 * 963 * XXX TODO: Check hlim and multicast scope here to avoid 964 * unnecessarily calling into ip6_mforward(). 965 */ 966 if (ip6_mforward && 967 ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) { 968 IP6STAT_INC(ip6s_cantforward); 969 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 970 goto bad; 971 } 972 } else if (!ours) { 973 ip6_forward(m, srcrt); 974 goto out; 975 } 976 977 ip6 = mtod(m, struct ip6_hdr *); 978 979 /* 980 * Malicious party may be able to use IPv4 mapped addr to confuse 981 * tcp/udp stack and bypass security checks (act as if it was from 982 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious. 983 * 984 * For SIIT end node behavior, you may want to disable the check. 985 * However, you will become vulnerable to attacks using IPv4 mapped 986 * source. 987 */ 988 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 989 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 990 IP6STAT_INC(ip6s_badscope); 991 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 992 goto bad; 993 } 994 995 /* 996 * Tell launch routine the next header 997 */ 998 IP6STAT_INC(ip6s_delivered); 999 in6_ifstat_inc(deliverifp, ifs6_in_deliver); 1000 nest = 0; 1001 1002 while (nxt != IPPROTO_DONE) { 1003 if (V_ip6_hdrnestlimit && (++nest > V_ip6_hdrnestlimit)) { 1004 IP6STAT_INC(ip6s_toomanyhdr); 1005 goto bad; 1006 } 1007 1008 /* 1009 * protection against faulty packet - there should be 1010 * more sanity checks in header chain processing. 1011 */ 1012 if (m->m_pkthdr.len < off) { 1013 IP6STAT_INC(ip6s_tooshort); 1014 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 1015 goto bad; 1016 } 1017 1018 #ifdef IPSEC 1019 /* 1020 * enforce IPsec policy checking if we are seeing last header. 1021 * note that we do not visit this with protocols with pcb layer 1022 * code - like udp/tcp/raw ip. 1023 */ 1024 if (ip6_ipsec_input(m, nxt)) 1025 goto bad; 1026 #endif /* IPSEC */ 1027 1028 /* 1029 * Use mbuf flags to propagate Router Alert option to 1030 * ICMPv6 layer, as hop-by-hop options have been stripped. 1031 */ 1032 if (nxt == IPPROTO_ICMPV6 && rtalert != ~0) 1033 m->m_flags |= M_RTALERT_MLD; 1034 1035 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt); 1036 } 1037 goto out; 1038 bad: 1039 m_freem(m); 1040 out: 1041 if (rin6.ro_rt) 1042 RTFREE(rin6.ro_rt); 1043 } 1044 1045 /* 1046 * set/grab in6_ifaddr correspond to IPv6 destination address. 1047 * XXX backward compatibility wrapper 1048 * 1049 * XXXRW: We should bump the refcount on ia6 before sticking it in the m_tag, 1050 * and then bump it when the tag is copied, and release it when the tag is 1051 * freed. Unfortunately, m_tags don't support deep copies (yet), so instead 1052 * we just bump the ia refcount when we receive it. This should be fixed. 1053 */ 1054 static struct ip6aux * 1055 ip6_setdstifaddr(struct mbuf *m, struct in6_ifaddr *ia6) 1056 { 1057 struct ip6aux *ip6a; 1058 1059 ip6a = ip6_addaux(m); 1060 if (ip6a) 1061 ip6a->ip6a_dstia6 = ia6; 1062 return ip6a; /* NULL if failed to set */ 1063 } 1064 1065 struct in6_ifaddr * 1066 ip6_getdstifaddr(struct mbuf *m) 1067 { 1068 struct ip6aux *ip6a; 1069 struct in6_ifaddr *ia; 1070 1071 ip6a = ip6_findaux(m); 1072 if (ip6a) { 1073 ia = ip6a->ip6a_dstia6; 1074 ifa_ref(&ia->ia_ifa); 1075 return ia; 1076 } else 1077 return NULL; 1078 } 1079 1080 /* 1081 * Hop-by-Hop options header processing. If a valid jumbo payload option is 1082 * included, the real payload length will be stored in plenp. 1083 * 1084 * rtalertp - XXX: should be stored more smart way 1085 */ 1086 static int 1087 ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp, 1088 struct mbuf **mp, int *offp) 1089 { 1090 struct mbuf *m = *mp; 1091 int off = *offp, hbhlen; 1092 struct ip6_hbh *hbh; 1093 u_int8_t *opt; 1094 1095 /* validation of the length of the header */ 1096 #ifndef PULLDOWN_TEST 1097 IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1); 1098 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); 1099 hbhlen = (hbh->ip6h_len + 1) << 3; 1100 1101 IP6_EXTHDR_CHECK(m, off, hbhlen, -1); 1102 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); 1103 #else 1104 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, 1105 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh)); 1106 if (hbh == NULL) { 1107 IP6STAT_INC(ip6s_tooshort); 1108 return -1; 1109 } 1110 hbhlen = (hbh->ip6h_len + 1) << 3; 1111 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 1112 hbhlen); 1113 if (hbh == NULL) { 1114 IP6STAT_INC(ip6s_tooshort); 1115 return -1; 1116 } 1117 #endif 1118 off += hbhlen; 1119 hbhlen -= sizeof(struct ip6_hbh); 1120 opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh); 1121 1122 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 1123 hbhlen, rtalertp, plenp) < 0) 1124 return (-1); 1125 1126 *offp = off; 1127 *mp = m; 1128 return (0); 1129 } 1130 1131 /* 1132 * Search header for all Hop-by-hop options and process each option. 1133 * This function is separate from ip6_hopopts_input() in order to 1134 * handle a case where the sending node itself process its hop-by-hop 1135 * options header. In such a case, the function is called from ip6_output(). 1136 * 1137 * The function assumes that hbh header is located right after the IPv6 header 1138 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to 1139 * opthead + hbhlen is located in contiguous memory region. 1140 */ 1141 int 1142 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen, 1143 u_int32_t *rtalertp, u_int32_t *plenp) 1144 { 1145 struct ip6_hdr *ip6; 1146 int optlen = 0; 1147 u_int8_t *opt = opthead; 1148 u_int16_t rtalert_val; 1149 u_int32_t jumboplen; 1150 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh); 1151 1152 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 1153 switch (*opt) { 1154 case IP6OPT_PAD1: 1155 optlen = 1; 1156 break; 1157 case IP6OPT_PADN: 1158 if (hbhlen < IP6OPT_MINLEN) { 1159 IP6STAT_INC(ip6s_toosmall); 1160 goto bad; 1161 } 1162 optlen = *(opt + 1) + 2; 1163 break; 1164 case IP6OPT_ROUTER_ALERT: 1165 /* XXX may need check for alignment */ 1166 if (hbhlen < IP6OPT_RTALERT_LEN) { 1167 IP6STAT_INC(ip6s_toosmall); 1168 goto bad; 1169 } 1170 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) { 1171 /* XXX stat */ 1172 icmp6_error(m, ICMP6_PARAM_PROB, 1173 ICMP6_PARAMPROB_HEADER, 1174 erroff + opt + 1 - opthead); 1175 return (-1); 1176 } 1177 optlen = IP6OPT_RTALERT_LEN; 1178 bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2); 1179 *rtalertp = ntohs(rtalert_val); 1180 break; 1181 case IP6OPT_JUMBO: 1182 /* XXX may need check for alignment */ 1183 if (hbhlen < IP6OPT_JUMBO_LEN) { 1184 IP6STAT_INC(ip6s_toosmall); 1185 goto bad; 1186 } 1187 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) { 1188 /* XXX stat */ 1189 icmp6_error(m, ICMP6_PARAM_PROB, 1190 ICMP6_PARAMPROB_HEADER, 1191 erroff + opt + 1 - opthead); 1192 return (-1); 1193 } 1194 optlen = IP6OPT_JUMBO_LEN; 1195 1196 /* 1197 * IPv6 packets that have non 0 payload length 1198 * must not contain a jumbo payload option. 1199 */ 1200 ip6 = mtod(m, struct ip6_hdr *); 1201 if (ip6->ip6_plen) { 1202 IP6STAT_INC(ip6s_badoptions); 1203 icmp6_error(m, ICMP6_PARAM_PROB, 1204 ICMP6_PARAMPROB_HEADER, 1205 erroff + opt - opthead); 1206 return (-1); 1207 } 1208 1209 /* 1210 * We may see jumbolen in unaligned location, so 1211 * we'd need to perform bcopy(). 1212 */ 1213 bcopy(opt + 2, &jumboplen, sizeof(jumboplen)); 1214 jumboplen = (u_int32_t)htonl(jumboplen); 1215 1216 #if 1 1217 /* 1218 * if there are multiple jumbo payload options, 1219 * *plenp will be non-zero and the packet will be 1220 * rejected. 1221 * the behavior may need some debate in ipngwg - 1222 * multiple options does not make sense, however, 1223 * there's no explicit mention in specification. 1224 */ 1225 if (*plenp != 0) { 1226 IP6STAT_INC(ip6s_badoptions); 1227 icmp6_error(m, ICMP6_PARAM_PROB, 1228 ICMP6_PARAMPROB_HEADER, 1229 erroff + opt + 2 - opthead); 1230 return (-1); 1231 } 1232 #endif 1233 1234 /* 1235 * jumbo payload length must be larger than 65535. 1236 */ 1237 if (jumboplen <= IPV6_MAXPACKET) { 1238 IP6STAT_INC(ip6s_badoptions); 1239 icmp6_error(m, ICMP6_PARAM_PROB, 1240 ICMP6_PARAMPROB_HEADER, 1241 erroff + opt + 2 - opthead); 1242 return (-1); 1243 } 1244 *plenp = jumboplen; 1245 1246 break; 1247 default: /* unknown option */ 1248 if (hbhlen < IP6OPT_MINLEN) { 1249 IP6STAT_INC(ip6s_toosmall); 1250 goto bad; 1251 } 1252 optlen = ip6_unknown_opt(opt, m, 1253 erroff + opt - opthead); 1254 if (optlen == -1) 1255 return (-1); 1256 optlen += 2; 1257 break; 1258 } 1259 } 1260 1261 return (0); 1262 1263 bad: 1264 m_freem(m); 1265 return (-1); 1266 } 1267 1268 /* 1269 * Unknown option processing. 1270 * The third argument `off' is the offset from the IPv6 header to the option, 1271 * which is necessary if the IPv6 header the and option header and IPv6 header 1272 * is not contiguous in order to return an ICMPv6 error. 1273 */ 1274 int 1275 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off) 1276 { 1277 struct ip6_hdr *ip6; 1278 1279 switch (IP6OPT_TYPE(*optp)) { 1280 case IP6OPT_TYPE_SKIP: /* ignore the option */ 1281 return ((int)*(optp + 1)); 1282 case IP6OPT_TYPE_DISCARD: /* silently discard */ 1283 m_freem(m); 1284 return (-1); 1285 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 1286 IP6STAT_INC(ip6s_badoptions); 1287 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 1288 return (-1); 1289 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 1290 IP6STAT_INC(ip6s_badoptions); 1291 ip6 = mtod(m, struct ip6_hdr *); 1292 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 1293 (m->m_flags & (M_BCAST|M_MCAST))) 1294 m_freem(m); 1295 else 1296 icmp6_error(m, ICMP6_PARAM_PROB, 1297 ICMP6_PARAMPROB_OPTION, off); 1298 return (-1); 1299 } 1300 1301 m_freem(m); /* XXX: NOTREACHED */ 1302 return (-1); 1303 } 1304 1305 /* 1306 * Create the "control" list for this pcb. 1307 * These functions will not modify mbuf chain at all. 1308 * 1309 * With KAME mbuf chain restriction: 1310 * The routine will be called from upper layer handlers like tcp6_input(). 1311 * Thus the routine assumes that the caller (tcp6_input) have already 1312 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the 1313 * very first mbuf on the mbuf chain. 1314 * 1315 * ip6_savecontrol_v4 will handle those options that are possible to be 1316 * set on a v4-mapped socket. 1317 * ip6_savecontrol will directly call ip6_savecontrol_v4 to handle those 1318 * options and handle the v6-only ones itself. 1319 */ 1320 struct mbuf ** 1321 ip6_savecontrol_v4(struct inpcb *inp, struct mbuf *m, struct mbuf **mp, 1322 int *v4only) 1323 { 1324 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1325 1326 #ifdef SO_TIMESTAMP 1327 if ((inp->inp_socket->so_options & SO_TIMESTAMP) != 0) { 1328 struct timeval tv; 1329 1330 microtime(&tv); 1331 *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv), 1332 SCM_TIMESTAMP, SOL_SOCKET); 1333 if (*mp) 1334 mp = &(*mp)->m_next; 1335 } 1336 #endif 1337 1338 #define IS2292(inp, x, y) (((inp)->inp_flags & IN6P_RFC2292) ? (x) : (y)) 1339 /* RFC 2292 sec. 5 */ 1340 if ((inp->inp_flags & IN6P_PKTINFO) != 0) { 1341 struct in6_pktinfo pi6; 1342 1343 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1344 #ifdef INET 1345 struct ip *ip; 1346 1347 ip = mtod(m, struct ip *); 1348 pi6.ipi6_addr.s6_addr32[0] = 0; 1349 pi6.ipi6_addr.s6_addr32[1] = 0; 1350 pi6.ipi6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP; 1351 pi6.ipi6_addr.s6_addr32[3] = ip->ip_dst.s_addr; 1352 #else 1353 /* We won't hit this code */ 1354 bzero(&pi6.ipi6_addr, sizeof(struct in6_addr)); 1355 #endif 1356 } else { 1357 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr)); 1358 in6_clearscope(&pi6.ipi6_addr); /* XXX */ 1359 } 1360 pi6.ipi6_ifindex = 1361 (m && m->m_pkthdr.rcvif) ? m->m_pkthdr.rcvif->if_index : 0; 1362 1363 *mp = sbcreatecontrol((caddr_t) &pi6, 1364 sizeof(struct in6_pktinfo), 1365 IS2292(inp, IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6); 1366 if (*mp) 1367 mp = &(*mp)->m_next; 1368 } 1369 1370 if ((inp->inp_flags & IN6P_HOPLIMIT) != 0) { 1371 int hlim; 1372 1373 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1374 #ifdef INET 1375 struct ip *ip; 1376 1377 ip = mtod(m, struct ip *); 1378 hlim = ip->ip_ttl; 1379 #else 1380 /* We won't hit this code */ 1381 hlim = 0; 1382 #endif 1383 } else { 1384 hlim = ip6->ip6_hlim & 0xff; 1385 } 1386 *mp = sbcreatecontrol((caddr_t) &hlim, sizeof(int), 1387 IS2292(inp, IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), 1388 IPPROTO_IPV6); 1389 if (*mp) 1390 mp = &(*mp)->m_next; 1391 } 1392 1393 if ((inp->inp_flags & IN6P_TCLASS) != 0) { 1394 int tclass; 1395 1396 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1397 #ifdef INET 1398 struct ip *ip; 1399 1400 ip = mtod(m, struct ip *); 1401 tclass = ip->ip_tos; 1402 #else 1403 /* We won't hit this code */ 1404 tclass = 0; 1405 #endif 1406 } else { 1407 u_int32_t flowinfo; 1408 1409 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK); 1410 flowinfo >>= 20; 1411 tclass = flowinfo & 0xff; 1412 } 1413 *mp = sbcreatecontrol((caddr_t) &tclass, sizeof(int), 1414 IPV6_TCLASS, IPPROTO_IPV6); 1415 if (*mp) 1416 mp = &(*mp)->m_next; 1417 } 1418 1419 if (v4only != NULL) { 1420 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1421 *v4only = 1; 1422 } else { 1423 *v4only = 0; 1424 } 1425 } 1426 1427 return (mp); 1428 } 1429 1430 void 1431 ip6_savecontrol(struct inpcb *in6p, struct mbuf *m, struct mbuf **mp) 1432 { 1433 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1434 int v4only = 0; 1435 1436 mp = ip6_savecontrol_v4(in6p, m, mp, &v4only); 1437 if (v4only) 1438 return; 1439 1440 /* 1441 * IPV6_HOPOPTS socket option. Recall that we required super-user 1442 * privilege for the option (see ip6_ctloutput), but it might be too 1443 * strict, since there might be some hop-by-hop options which can be 1444 * returned to normal user. 1445 * See also RFC 2292 section 6 (or RFC 3542 section 8). 1446 */ 1447 if ((in6p->inp_flags & IN6P_HOPOPTS) != 0) { 1448 /* 1449 * Check if a hop-by-hop options header is contatined in the 1450 * received packet, and if so, store the options as ancillary 1451 * data. Note that a hop-by-hop options header must be 1452 * just after the IPv6 header, which is assured through the 1453 * IPv6 input processing. 1454 */ 1455 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 1456 struct ip6_hbh *hbh; 1457 int hbhlen = 0; 1458 #ifdef PULLDOWN_TEST 1459 struct mbuf *ext; 1460 #endif 1461 1462 #ifndef PULLDOWN_TEST 1463 hbh = (struct ip6_hbh *)(ip6 + 1); 1464 hbhlen = (hbh->ip6h_len + 1) << 3; 1465 #else 1466 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr), 1467 ip6->ip6_nxt); 1468 if (ext == NULL) { 1469 IP6STAT_INC(ip6s_tooshort); 1470 return; 1471 } 1472 hbh = mtod(ext, struct ip6_hbh *); 1473 hbhlen = (hbh->ip6h_len + 1) << 3; 1474 if (hbhlen != ext->m_len) { 1475 m_freem(ext); 1476 IP6STAT_INC(ip6s_tooshort); 1477 return; 1478 } 1479 #endif 1480 1481 /* 1482 * XXX: We copy the whole header even if a 1483 * jumbo payload option is included, the option which 1484 * is to be removed before returning according to 1485 * RFC2292. 1486 * Note: this constraint is removed in RFC3542 1487 */ 1488 *mp = sbcreatecontrol((caddr_t)hbh, hbhlen, 1489 IS2292(in6p, IPV6_2292HOPOPTS, IPV6_HOPOPTS), 1490 IPPROTO_IPV6); 1491 if (*mp) 1492 mp = &(*mp)->m_next; 1493 #ifdef PULLDOWN_TEST 1494 m_freem(ext); 1495 #endif 1496 } 1497 } 1498 1499 if ((in6p->inp_flags & (IN6P_RTHDR | IN6P_DSTOPTS)) != 0) { 1500 int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr); 1501 1502 /* 1503 * Search for destination options headers or routing 1504 * header(s) through the header chain, and stores each 1505 * header as ancillary data. 1506 * Note that the order of the headers remains in 1507 * the chain of ancillary data. 1508 */ 1509 while (1) { /* is explicit loop prevention necessary? */ 1510 struct ip6_ext *ip6e = NULL; 1511 int elen; 1512 #ifdef PULLDOWN_TEST 1513 struct mbuf *ext = NULL; 1514 #endif 1515 1516 /* 1517 * if it is not an extension header, don't try to 1518 * pull it from the chain. 1519 */ 1520 switch (nxt) { 1521 case IPPROTO_DSTOPTS: 1522 case IPPROTO_ROUTING: 1523 case IPPROTO_HOPOPTS: 1524 case IPPROTO_AH: /* is it possible? */ 1525 break; 1526 default: 1527 goto loopend; 1528 } 1529 1530 #ifndef PULLDOWN_TEST 1531 if (off + sizeof(*ip6e) > m->m_len) 1532 goto loopend; 1533 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off); 1534 if (nxt == IPPROTO_AH) 1535 elen = (ip6e->ip6e_len + 2) << 2; 1536 else 1537 elen = (ip6e->ip6e_len + 1) << 3; 1538 if (off + elen > m->m_len) 1539 goto loopend; 1540 #else 1541 ext = ip6_pullexthdr(m, off, nxt); 1542 if (ext == NULL) { 1543 IP6STAT_INC(ip6s_tooshort); 1544 return; 1545 } 1546 ip6e = mtod(ext, struct ip6_ext *); 1547 if (nxt == IPPROTO_AH) 1548 elen = (ip6e->ip6e_len + 2) << 2; 1549 else 1550 elen = (ip6e->ip6e_len + 1) << 3; 1551 if (elen != ext->m_len) { 1552 m_freem(ext); 1553 IP6STAT_INC(ip6s_tooshort); 1554 return; 1555 } 1556 #endif 1557 1558 switch (nxt) { 1559 case IPPROTO_DSTOPTS: 1560 if (!(in6p->inp_flags & IN6P_DSTOPTS)) 1561 break; 1562 1563 *mp = sbcreatecontrol((caddr_t)ip6e, elen, 1564 IS2292(in6p, 1565 IPV6_2292DSTOPTS, IPV6_DSTOPTS), 1566 IPPROTO_IPV6); 1567 if (*mp) 1568 mp = &(*mp)->m_next; 1569 break; 1570 case IPPROTO_ROUTING: 1571 if (!(in6p->inp_flags & IN6P_RTHDR)) 1572 break; 1573 1574 *mp = sbcreatecontrol((caddr_t)ip6e, elen, 1575 IS2292(in6p, IPV6_2292RTHDR, IPV6_RTHDR), 1576 IPPROTO_IPV6); 1577 if (*mp) 1578 mp = &(*mp)->m_next; 1579 break; 1580 case IPPROTO_HOPOPTS: 1581 case IPPROTO_AH: /* is it possible? */ 1582 break; 1583 1584 default: 1585 /* 1586 * other cases have been filtered in the above. 1587 * none will visit this case. here we supply 1588 * the code just in case (nxt overwritten or 1589 * other cases). 1590 */ 1591 #ifdef PULLDOWN_TEST 1592 m_freem(ext); 1593 #endif 1594 goto loopend; 1595 1596 } 1597 1598 /* proceed with the next header. */ 1599 off += elen; 1600 nxt = ip6e->ip6e_nxt; 1601 ip6e = NULL; 1602 #ifdef PULLDOWN_TEST 1603 m_freem(ext); 1604 ext = NULL; 1605 #endif 1606 } 1607 loopend: 1608 ; 1609 } 1610 } 1611 #undef IS2292 1612 1613 void 1614 ip6_notify_pmtu(struct inpcb *in6p, struct sockaddr_in6 *dst, u_int32_t *mtu) 1615 { 1616 struct socket *so; 1617 struct mbuf *m_mtu; 1618 struct ip6_mtuinfo mtuctl; 1619 1620 so = in6p->inp_socket; 1621 1622 if (mtu == NULL) 1623 return; 1624 1625 #ifdef DIAGNOSTIC 1626 if (so == NULL) /* I believe this is impossible */ 1627 panic("ip6_notify_pmtu: socket is NULL"); 1628 #endif 1629 1630 bzero(&mtuctl, sizeof(mtuctl)); /* zero-clear for safety */ 1631 mtuctl.ip6m_mtu = *mtu; 1632 mtuctl.ip6m_addr = *dst; 1633 if (sa6_recoverscope(&mtuctl.ip6m_addr)) 1634 return; 1635 1636 if ((m_mtu = sbcreatecontrol((caddr_t)&mtuctl, sizeof(mtuctl), 1637 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL) 1638 return; 1639 1640 if (sbappendaddr(&so->so_rcv, (struct sockaddr *)dst, NULL, m_mtu) 1641 == 0) { 1642 m_freem(m_mtu); 1643 /* XXX: should count statistics */ 1644 } else 1645 sorwakeup(so); 1646 1647 return; 1648 } 1649 1650 #ifdef PULLDOWN_TEST 1651 /* 1652 * pull single extension header from mbuf chain. returns single mbuf that 1653 * contains the result, or NULL on error. 1654 */ 1655 static struct mbuf * 1656 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt) 1657 { 1658 struct ip6_ext ip6e; 1659 size_t elen; 1660 struct mbuf *n; 1661 1662 #ifdef DIAGNOSTIC 1663 switch (nxt) { 1664 case IPPROTO_DSTOPTS: 1665 case IPPROTO_ROUTING: 1666 case IPPROTO_HOPOPTS: 1667 case IPPROTO_AH: /* is it possible? */ 1668 break; 1669 default: 1670 printf("ip6_pullexthdr: invalid nxt=%d\n", nxt); 1671 } 1672 #endif 1673 1674 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1675 if (nxt == IPPROTO_AH) 1676 elen = (ip6e.ip6e_len + 2) << 2; 1677 else 1678 elen = (ip6e.ip6e_len + 1) << 3; 1679 1680 if (elen > MLEN) 1681 n = m_getcl(M_NOWAIT, MT_DATA, 0); 1682 else 1683 n = m_get(M_NOWAIT, MT_DATA); 1684 if (n == NULL) 1685 return NULL; 1686 1687 m_copydata(m, off, elen, mtod(n, caddr_t)); 1688 n->m_len = elen; 1689 return n; 1690 } 1691 #endif 1692 1693 /* 1694 * Get pointer to the previous header followed by the header 1695 * currently processed. 1696 * XXX: This function supposes that 1697 * M includes all headers, 1698 * the next header field and the header length field of each header 1699 * are valid, and 1700 * the sum of each header length equals to OFF. 1701 * Because of these assumptions, this function must be called very 1702 * carefully. Moreover, it will not be used in the near future when 1703 * we develop `neater' mechanism to process extension headers. 1704 */ 1705 char * 1706 ip6_get_prevhdr(struct mbuf *m, int off) 1707 { 1708 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1709 1710 if (off == sizeof(struct ip6_hdr)) 1711 return (&ip6->ip6_nxt); 1712 else { 1713 int len, nxt; 1714 struct ip6_ext *ip6e = NULL; 1715 1716 nxt = ip6->ip6_nxt; 1717 len = sizeof(struct ip6_hdr); 1718 while (len < off) { 1719 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len); 1720 1721 switch (nxt) { 1722 case IPPROTO_FRAGMENT: 1723 len += sizeof(struct ip6_frag); 1724 break; 1725 case IPPROTO_AH: 1726 len += (ip6e->ip6e_len + 2) << 2; 1727 break; 1728 default: 1729 len += (ip6e->ip6e_len + 1) << 3; 1730 break; 1731 } 1732 nxt = ip6e->ip6e_nxt; 1733 } 1734 if (ip6e) 1735 return (&ip6e->ip6e_nxt); 1736 else 1737 return NULL; 1738 } 1739 } 1740 1741 /* 1742 * get next header offset. m will be retained. 1743 */ 1744 int 1745 ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp) 1746 { 1747 struct ip6_hdr ip6; 1748 struct ip6_ext ip6e; 1749 struct ip6_frag fh; 1750 1751 /* just in case */ 1752 if (m == NULL) 1753 panic("ip6_nexthdr: m == NULL"); 1754 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off) 1755 return -1; 1756 1757 switch (proto) { 1758 case IPPROTO_IPV6: 1759 if (m->m_pkthdr.len < off + sizeof(ip6)) 1760 return -1; 1761 m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6); 1762 if (nxtp) 1763 *nxtp = ip6.ip6_nxt; 1764 off += sizeof(ip6); 1765 return off; 1766 1767 case IPPROTO_FRAGMENT: 1768 /* 1769 * terminate parsing if it is not the first fragment, 1770 * it does not make sense to parse through it. 1771 */ 1772 if (m->m_pkthdr.len < off + sizeof(fh)) 1773 return -1; 1774 m_copydata(m, off, sizeof(fh), (caddr_t)&fh); 1775 /* IP6F_OFF_MASK = 0xfff8(BigEndian), 0xf8ff(LittleEndian) */ 1776 if (fh.ip6f_offlg & IP6F_OFF_MASK) 1777 return -1; 1778 if (nxtp) 1779 *nxtp = fh.ip6f_nxt; 1780 off += sizeof(struct ip6_frag); 1781 return off; 1782 1783 case IPPROTO_AH: 1784 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1785 return -1; 1786 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1787 if (nxtp) 1788 *nxtp = ip6e.ip6e_nxt; 1789 off += (ip6e.ip6e_len + 2) << 2; 1790 return off; 1791 1792 case IPPROTO_HOPOPTS: 1793 case IPPROTO_ROUTING: 1794 case IPPROTO_DSTOPTS: 1795 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1796 return -1; 1797 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1798 if (nxtp) 1799 *nxtp = ip6e.ip6e_nxt; 1800 off += (ip6e.ip6e_len + 1) << 3; 1801 return off; 1802 1803 case IPPROTO_NONE: 1804 case IPPROTO_ESP: 1805 case IPPROTO_IPCOMP: 1806 /* give up */ 1807 return -1; 1808 1809 default: 1810 return -1; 1811 } 1812 1813 return -1; 1814 } 1815 1816 /* 1817 * get offset for the last header in the chain. m will be kept untainted. 1818 */ 1819 int 1820 ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp) 1821 { 1822 int newoff; 1823 int nxt; 1824 1825 if (!nxtp) { 1826 nxt = -1; 1827 nxtp = &nxt; 1828 } 1829 while (1) { 1830 newoff = ip6_nexthdr(m, off, proto, nxtp); 1831 if (newoff < 0) 1832 return off; 1833 else if (newoff < off) 1834 return -1; /* invalid */ 1835 else if (newoff == off) 1836 return newoff; 1837 1838 off = newoff; 1839 proto = *nxtp; 1840 } 1841 } 1842 1843 static struct ip6aux * 1844 ip6_addaux(struct mbuf *m) 1845 { 1846 struct m_tag *mtag; 1847 1848 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL); 1849 if (!mtag) { 1850 mtag = m_tag_get(PACKET_TAG_IPV6_INPUT, sizeof(struct ip6aux), 1851 M_NOWAIT); 1852 if (mtag) { 1853 m_tag_prepend(m, mtag); 1854 bzero(mtag + 1, sizeof(struct ip6aux)); 1855 } 1856 } 1857 return mtag ? (struct ip6aux *)(mtag + 1) : NULL; 1858 } 1859 1860 static struct ip6aux * 1861 ip6_findaux(struct mbuf *m) 1862 { 1863 struct m_tag *mtag; 1864 1865 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL); 1866 return mtag ? (struct ip6aux *)(mtag + 1) : NULL; 1867 } 1868 1869 static void 1870 ip6_delaux(struct mbuf *m) 1871 { 1872 struct m_tag *mtag; 1873 1874 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL); 1875 if (mtag) 1876 m_tag_delete(m, mtag); 1877 } 1878 1879 /* 1880 * System control for IP6 1881 */ 1882 1883 u_char inet6ctlerrmap[PRC_NCMDS] = { 1884 0, 0, 0, 0, 1885 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 1886 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 1887 EMSGSIZE, EHOSTUNREACH, 0, 0, 1888 0, 0, 0, 0, 1889 ENOPROTOOPT 1890 }; 1891