1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the project nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * $KAME: ip6_input.c,v 1.259 2002/01/21 04:58:09 jinmei Exp $ 32 */ 33 34 /*- 35 * Copyright (c) 1982, 1986, 1988, 1993 36 * The Regents of the University of California. All rights reserved. 37 * 38 * Redistribution and use in source and binary forms, with or without 39 * modification, are permitted provided that the following conditions 40 * are met: 41 * 1. Redistributions of source code must retain the above copyright 42 * notice, this list of conditions and the following disclaimer. 43 * 2. Redistributions in binary form must reproduce the above copyright 44 * notice, this list of conditions and the following disclaimer in the 45 * documentation and/or other materials provided with the distribution. 46 * 3. Neither the name of the University nor the names of its contributors 47 * may be used to endorse or promote products derived from this software 48 * without specific prior written permission. 49 * 50 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 51 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 53 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 54 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 55 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 56 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 57 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 58 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 59 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 60 * SUCH DAMAGE. 61 * 62 * @(#)ip_input.c 8.2 (Berkeley) 1/4/94 63 */ 64 65 #include <sys/cdefs.h> 66 __FBSDID("$FreeBSD$"); 67 68 #include "opt_inet.h" 69 #include "opt_inet6.h" 70 #include "opt_ipsec.h" 71 #include "opt_route.h" 72 #include "opt_rss.h" 73 74 #include <sys/param.h> 75 #include <sys/systm.h> 76 #include <sys/hhook.h> 77 #include <sys/malloc.h> 78 #include <sys/mbuf.h> 79 #include <sys/proc.h> 80 #include <sys/domain.h> 81 #include <sys/protosw.h> 82 #include <sys/sdt.h> 83 #include <sys/socket.h> 84 #include <sys/socketvar.h> 85 #include <sys/errno.h> 86 #include <sys/time.h> 87 #include <sys/kernel.h> 88 #include <sys/lock.h> 89 #include <sys/rmlock.h> 90 #include <sys/syslog.h> 91 #include <sys/sysctl.h> 92 93 #include <net/if.h> 94 #include <net/if_var.h> 95 #include <net/if_types.h> 96 #include <net/if_dl.h> 97 #include <net/route.h> 98 #include <net/netisr.h> 99 #include <net/rss_config.h> 100 #include <net/pfil.h> 101 #include <net/vnet.h> 102 103 #include <netinet/in.h> 104 #include <netinet/in_kdtrace.h> 105 #include <netinet/ip_var.h> 106 #include <netinet/in_systm.h> 107 #include <net/if_llatbl.h> 108 #ifdef INET 109 #include <netinet/ip.h> 110 #include <netinet/ip_icmp.h> 111 #endif /* INET */ 112 #include <netinet/ip6.h> 113 #include <netinet6/in6_var.h> 114 #include <netinet6/ip6_var.h> 115 #include <netinet/in_pcb.h> 116 #include <netinet/icmp6.h> 117 #include <netinet6/scope6_var.h> 118 #include <netinet6/in6_ifattach.h> 119 #include <netinet6/mld6_var.h> 120 #include <netinet6/nd6.h> 121 #include <netinet6/in6_rss.h> 122 123 #include <netipsec/ipsec_support.h> 124 125 #include <netinet6/ip6protosw.h> 126 127 extern struct domain inet6domain; 128 129 u_char ip6_protox[IPPROTO_MAX]; 130 VNET_DEFINE(struct in6_ifaddrhead, in6_ifaddrhead); 131 VNET_DEFINE(struct in6_ifaddrlisthead *, in6_ifaddrhashtbl); 132 VNET_DEFINE(u_long, in6_ifaddrhmask); 133 134 static struct netisr_handler ip6_nh = { 135 .nh_name = "ip6", 136 .nh_handler = ip6_input, 137 .nh_proto = NETISR_IPV6, 138 #ifdef RSS 139 .nh_m2cpuid = rss_soft_m2cpuid_v6, 140 .nh_policy = NETISR_POLICY_CPU, 141 .nh_dispatch = NETISR_DISPATCH_HYBRID, 142 #else 143 .nh_policy = NETISR_POLICY_FLOW, 144 #endif 145 }; 146 147 static int 148 sysctl_netinet6_intr_queue_maxlen(SYSCTL_HANDLER_ARGS) 149 { 150 int error, qlimit; 151 152 netisr_getqlimit(&ip6_nh, &qlimit); 153 error = sysctl_handle_int(oidp, &qlimit, 0, req); 154 if (error || !req->newptr) 155 return (error); 156 if (qlimit < 1) 157 return (EINVAL); 158 return (netisr_setqlimit(&ip6_nh, qlimit)); 159 } 160 SYSCTL_DECL(_net_inet6_ip6); 161 SYSCTL_PROC(_net_inet6_ip6, IPV6CTL_INTRQMAXLEN, intr_queue_maxlen, 162 CTLTYPE_INT|CTLFLAG_RW, 0, 0, sysctl_netinet6_intr_queue_maxlen, "I", 163 "Maximum size of the IPv6 input queue"); 164 165 #ifdef RSS 166 static struct netisr_handler ip6_direct_nh = { 167 .nh_name = "ip6_direct", 168 .nh_handler = ip6_direct_input, 169 .nh_proto = NETISR_IPV6_DIRECT, 170 .nh_m2cpuid = rss_soft_m2cpuid_v6, 171 .nh_policy = NETISR_POLICY_CPU, 172 .nh_dispatch = NETISR_DISPATCH_HYBRID, 173 }; 174 175 static int 176 sysctl_netinet6_intr_direct_queue_maxlen(SYSCTL_HANDLER_ARGS) 177 { 178 int error, qlimit; 179 180 netisr_getqlimit(&ip6_direct_nh, &qlimit); 181 error = sysctl_handle_int(oidp, &qlimit, 0, req); 182 if (error || !req->newptr) 183 return (error); 184 if (qlimit < 1) 185 return (EINVAL); 186 return (netisr_setqlimit(&ip6_direct_nh, qlimit)); 187 } 188 SYSCTL_PROC(_net_inet6_ip6, IPV6CTL_INTRDQMAXLEN, intr_direct_queue_maxlen, 189 CTLTYPE_INT|CTLFLAG_RW, 0, 0, sysctl_netinet6_intr_direct_queue_maxlen, 190 "I", "Maximum size of the IPv6 direct input queue"); 191 192 #endif 193 194 VNET_DEFINE(pfil_head_t, inet6_pfil_head); 195 196 VNET_PCPUSTAT_DEFINE(struct ip6stat, ip6stat); 197 VNET_PCPUSTAT_SYSINIT(ip6stat); 198 #ifdef VIMAGE 199 VNET_PCPUSTAT_SYSUNINIT(ip6stat); 200 #endif /* VIMAGE */ 201 202 struct rmlock in6_ifaddr_lock; 203 RM_SYSINIT(in6_ifaddr_lock, &in6_ifaddr_lock, "in6_ifaddr_lock"); 204 205 static int ip6_hopopts_input(u_int32_t *, u_int32_t *, struct mbuf **, int *); 206 #ifdef PULLDOWN_TEST 207 static struct mbuf *ip6_pullexthdr(struct mbuf *, size_t, int); 208 #endif 209 210 /* 211 * IP6 initialization: fill in IP6 protocol switch table. 212 * All protocols not implemented in kernel go to raw IP6 protocol handler. 213 */ 214 void 215 ip6_init(void) 216 { 217 struct pfil_head_args args; 218 struct protosw *pr; 219 int i; 220 221 TUNABLE_INT_FETCH("net.inet6.ip6.auto_linklocal", 222 &V_ip6_auto_linklocal); 223 TUNABLE_INT_FETCH("net.inet6.ip6.accept_rtadv", &V_ip6_accept_rtadv); 224 TUNABLE_INT_FETCH("net.inet6.ip6.no_radr", &V_ip6_no_radr); 225 226 CK_STAILQ_INIT(&V_in6_ifaddrhead); 227 V_in6_ifaddrhashtbl = hashinit(IN6ADDR_NHASH, M_IFADDR, 228 &V_in6_ifaddrhmask); 229 230 /* Initialize packet filter hooks. */ 231 args.pa_version = PFIL_VERSION; 232 args.pa_flags = PFIL_IN | PFIL_OUT; 233 args.pa_type = PFIL_TYPE_IP6; 234 args.pa_headname = PFIL_INET6_NAME; 235 V_inet6_pfil_head = pfil_head_register(&args); 236 237 if (hhook_head_register(HHOOK_TYPE_IPSEC_IN, AF_INET6, 238 &V_ipsec_hhh_in[HHOOK_IPSEC_INET6], 239 HHOOK_WAITOK | HHOOK_HEADISINVNET) != 0) 240 printf("%s: WARNING: unable to register input helper hook\n", 241 __func__); 242 if (hhook_head_register(HHOOK_TYPE_IPSEC_OUT, AF_INET6, 243 &V_ipsec_hhh_out[HHOOK_IPSEC_INET6], 244 HHOOK_WAITOK | HHOOK_HEADISINVNET) != 0) 245 printf("%s: WARNING: unable to register output helper hook\n", 246 __func__); 247 248 scope6_init(); 249 addrsel_policy_init(); 250 nd6_init(); 251 frag6_init(); 252 253 V_ip6_desync_factor = arc4random() % MAX_TEMP_DESYNC_FACTOR; 254 255 /* Skip global initialization stuff for non-default instances. */ 256 #ifdef VIMAGE 257 if (!IS_DEFAULT_VNET(curvnet)) { 258 netisr_register_vnet(&ip6_nh); 259 #ifdef RSS 260 netisr_register_vnet(&ip6_direct_nh); 261 #endif 262 return; 263 } 264 #endif 265 266 pr = pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 267 if (pr == NULL) 268 panic("ip6_init"); 269 270 /* Initialize the entire ip6_protox[] array to IPPROTO_RAW. */ 271 for (i = 0; i < IPPROTO_MAX; i++) 272 ip6_protox[i] = pr - inet6sw; 273 /* 274 * Cycle through IP protocols and put them into the appropriate place 275 * in ip6_protox[]. 276 */ 277 for (pr = inet6domain.dom_protosw; 278 pr < inet6domain.dom_protoswNPROTOSW; pr++) 279 if (pr->pr_domain->dom_family == PF_INET6 && 280 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) { 281 /* Be careful to only index valid IP protocols. */ 282 if (pr->pr_protocol < IPPROTO_MAX) 283 ip6_protox[pr->pr_protocol] = pr - inet6sw; 284 } 285 286 netisr_register(&ip6_nh); 287 #ifdef RSS 288 netisr_register(&ip6_direct_nh); 289 #endif 290 } 291 292 /* 293 * The protocol to be inserted into ip6_protox[] must be already registered 294 * in inet6sw[], either statically or through pf_proto_register(). 295 */ 296 int 297 ip6proto_register(short ip6proto) 298 { 299 struct protosw *pr; 300 301 /* Sanity checks. */ 302 if (ip6proto <= 0 || ip6proto >= IPPROTO_MAX) 303 return (EPROTONOSUPPORT); 304 305 /* 306 * The protocol slot must not be occupied by another protocol 307 * already. An index pointing to IPPROTO_RAW is unused. 308 */ 309 pr = pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 310 if (pr == NULL) 311 return (EPFNOSUPPORT); 312 if (ip6_protox[ip6proto] != pr - inet6sw) /* IPPROTO_RAW */ 313 return (EEXIST); 314 315 /* 316 * Find the protocol position in inet6sw[] and set the index. 317 */ 318 for (pr = inet6domain.dom_protosw; 319 pr < inet6domain.dom_protoswNPROTOSW; pr++) { 320 if (pr->pr_domain->dom_family == PF_INET6 && 321 pr->pr_protocol && pr->pr_protocol == ip6proto) { 322 ip6_protox[pr->pr_protocol] = pr - inet6sw; 323 return (0); 324 } 325 } 326 return (EPROTONOSUPPORT); 327 } 328 329 int 330 ip6proto_unregister(short ip6proto) 331 { 332 struct protosw *pr; 333 334 /* Sanity checks. */ 335 if (ip6proto <= 0 || ip6proto >= IPPROTO_MAX) 336 return (EPROTONOSUPPORT); 337 338 /* Check if the protocol was indeed registered. */ 339 pr = pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 340 if (pr == NULL) 341 return (EPFNOSUPPORT); 342 if (ip6_protox[ip6proto] == pr - inet6sw) /* IPPROTO_RAW */ 343 return (ENOENT); 344 345 /* Reset the protocol slot to IPPROTO_RAW. */ 346 ip6_protox[ip6proto] = pr - inet6sw; 347 return (0); 348 } 349 350 #ifdef VIMAGE 351 static void 352 ip6_destroy(void *unused __unused) 353 { 354 struct ifaddr *ifa, *nifa; 355 struct ifnet *ifp; 356 int error; 357 358 #ifdef RSS 359 netisr_unregister_vnet(&ip6_direct_nh); 360 #endif 361 netisr_unregister_vnet(&ip6_nh); 362 363 pfil_head_unregister(V_inet6_pfil_head); 364 error = hhook_head_deregister(V_ipsec_hhh_in[HHOOK_IPSEC_INET6]); 365 if (error != 0) { 366 printf("%s: WARNING: unable to deregister input helper hook " 367 "type HHOOK_TYPE_IPSEC_IN, id HHOOK_IPSEC_INET6: " 368 "error %d returned\n", __func__, error); 369 } 370 error = hhook_head_deregister(V_ipsec_hhh_out[HHOOK_IPSEC_INET6]); 371 if (error != 0) { 372 printf("%s: WARNING: unable to deregister output helper hook " 373 "type HHOOK_TYPE_IPSEC_OUT, id HHOOK_IPSEC_INET6: " 374 "error %d returned\n", __func__, error); 375 } 376 377 /* Cleanup addresses. */ 378 IFNET_RLOCK(); 379 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 380 /* Cannot lock here - lock recursion. */ 381 /* IF_ADDR_LOCK(ifp); */ 382 CK_STAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, nifa) { 383 384 if (ifa->ifa_addr->sa_family != AF_INET6) 385 continue; 386 in6_purgeaddr(ifa); 387 } 388 /* IF_ADDR_UNLOCK(ifp); */ 389 in6_ifdetach_destroy(ifp); 390 mld_domifdetach(ifp); 391 /* Make sure any routes are gone as well. */ 392 rt_flushifroutes_af(ifp, AF_INET6); 393 } 394 IFNET_RUNLOCK(); 395 396 nd6_destroy(); 397 in6_ifattach_destroy(); 398 399 hashdestroy(V_in6_ifaddrhashtbl, M_IFADDR, V_in6_ifaddrhmask); 400 } 401 402 VNET_SYSUNINIT(inet6, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, ip6_destroy, NULL); 403 #endif 404 405 static int 406 ip6_input_hbh(struct mbuf **mp, uint32_t *plen, uint32_t *rtalert, int *off, 407 int *nxt, int *ours) 408 { 409 struct mbuf *m; 410 struct ip6_hdr *ip6; 411 struct ip6_hbh *hbh; 412 413 if (ip6_hopopts_input(plen, rtalert, mp, off)) { 414 #if 0 /*touches NULL pointer*/ 415 in6_ifstat_inc((*mp)->m_pkthdr.rcvif, ifs6_in_discard); 416 #endif 417 goto out; /* m have already been freed */ 418 } 419 420 /* adjust pointer */ 421 m = *mp; 422 ip6 = mtod(m, struct ip6_hdr *); 423 424 /* 425 * if the payload length field is 0 and the next header field 426 * indicates Hop-by-Hop Options header, then a Jumbo Payload 427 * option MUST be included. 428 */ 429 if (ip6->ip6_plen == 0 && *plen == 0) { 430 /* 431 * Note that if a valid jumbo payload option is 432 * contained, ip6_hopopts_input() must set a valid 433 * (non-zero) payload length to the variable plen. 434 */ 435 IP6STAT_INC(ip6s_badoptions); 436 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 437 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 438 icmp6_error(m, ICMP6_PARAM_PROB, 439 ICMP6_PARAMPROB_HEADER, 440 (caddr_t)&ip6->ip6_plen - (caddr_t)ip6); 441 goto out; 442 } 443 #ifndef PULLDOWN_TEST 444 /* ip6_hopopts_input() ensures that mbuf is contiguous */ 445 hbh = (struct ip6_hbh *)(ip6 + 1); 446 #else 447 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 448 sizeof(struct ip6_hbh)); 449 if (hbh == NULL) { 450 IP6STAT_INC(ip6s_tooshort); 451 goto out; 452 } 453 #endif 454 *nxt = hbh->ip6h_nxt; 455 456 /* 457 * If we are acting as a router and the packet contains a 458 * router alert option, see if we know the option value. 459 * Currently, we only support the option value for MLD, in which 460 * case we should pass the packet to the multicast routing 461 * daemon. 462 */ 463 if (*rtalert != ~0) { 464 switch (*rtalert) { 465 case IP6OPT_RTALERT_MLD: 466 if (V_ip6_forwarding) 467 *ours = 1; 468 break; 469 default: 470 /* 471 * RFC2711 requires unrecognized values must be 472 * silently ignored. 473 */ 474 break; 475 } 476 } 477 478 return (0); 479 480 out: 481 return (1); 482 } 483 484 #ifdef RSS 485 /* 486 * IPv6 direct input routine. 487 * 488 * This is called when reinjecting completed fragments where 489 * all of the previous checking and book-keeping has been done. 490 */ 491 void 492 ip6_direct_input(struct mbuf *m) 493 { 494 int off, nxt; 495 int nest; 496 struct m_tag *mtag; 497 struct ip6_direct_ctx *ip6dc; 498 499 mtag = m_tag_locate(m, MTAG_ABI_IPV6, IPV6_TAG_DIRECT, NULL); 500 KASSERT(mtag != NULL, ("Reinjected packet w/o direct ctx tag!")); 501 502 ip6dc = (struct ip6_direct_ctx *)(mtag + 1); 503 nxt = ip6dc->ip6dc_nxt; 504 off = ip6dc->ip6dc_off; 505 506 nest = 0; 507 508 m_tag_delete(m, mtag); 509 510 while (nxt != IPPROTO_DONE) { 511 if (V_ip6_hdrnestlimit && (++nest > V_ip6_hdrnestlimit)) { 512 IP6STAT_INC(ip6s_toomanyhdr); 513 goto bad; 514 } 515 516 /* 517 * protection against faulty packet - there should be 518 * more sanity checks in header chain processing. 519 */ 520 if (m->m_pkthdr.len < off) { 521 IP6STAT_INC(ip6s_tooshort); 522 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 523 goto bad; 524 } 525 526 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 527 if (IPSEC_ENABLED(ipv6)) { 528 if (IPSEC_INPUT(ipv6, m, off, nxt) != 0) 529 return; 530 } 531 #endif /* IPSEC */ 532 533 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt); 534 } 535 return; 536 bad: 537 m_freem(m); 538 } 539 #endif 540 541 void 542 ip6_input(struct mbuf *m) 543 { 544 struct in6_addr odst; 545 struct ip6_hdr *ip6; 546 struct in6_ifaddr *ia; 547 struct ifnet *rcvif; 548 u_int32_t plen; 549 u_int32_t rtalert = ~0; 550 int off = sizeof(struct ip6_hdr), nest; 551 int nxt, ours = 0; 552 int srcrt = 0; 553 554 /* 555 * Drop the packet if IPv6 operation is disabled on the interface. 556 */ 557 rcvif = m->m_pkthdr.rcvif; 558 if ((ND_IFINFO(rcvif)->flags & ND6_IFF_IFDISABLED)) 559 goto bad; 560 561 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 562 /* 563 * should the inner packet be considered authentic? 564 * see comment in ah4_input(). 565 * NB: m cannot be NULL when passed to the input routine 566 */ 567 568 m->m_flags &= ~M_AUTHIPHDR; 569 m->m_flags &= ~M_AUTHIPDGM; 570 571 #endif /* IPSEC */ 572 573 if (m->m_flags & M_FASTFWD_OURS) { 574 /* 575 * Firewall changed destination to local. 576 */ 577 ip6 = mtod(m, struct ip6_hdr *); 578 goto passin; 579 } 580 581 /* 582 * mbuf statistics 583 */ 584 if (m->m_flags & M_EXT) { 585 if (m->m_next) 586 IP6STAT_INC(ip6s_mext2m); 587 else 588 IP6STAT_INC(ip6s_mext1); 589 } else { 590 if (m->m_next) { 591 if (m->m_flags & M_LOOP) { 592 IP6STAT_INC(ip6s_m2m[V_loif->if_index]); 593 } else if (rcvif->if_index < IP6S_M2MMAX) 594 IP6STAT_INC(ip6s_m2m[rcvif->if_index]); 595 else 596 IP6STAT_INC(ip6s_m2m[0]); 597 } else 598 IP6STAT_INC(ip6s_m1); 599 } 600 601 in6_ifstat_inc(rcvif, ifs6_in_receive); 602 IP6STAT_INC(ip6s_total); 603 604 #ifndef PULLDOWN_TEST 605 /* 606 * L2 bridge code and some other code can return mbuf chain 607 * that does not conform to KAME requirement. too bad. 608 * XXX: fails to join if interface MTU > MCLBYTES. jumbogram? 609 */ 610 if (m && m->m_next != NULL && m->m_pkthdr.len < MCLBYTES) { 611 struct mbuf *n; 612 613 if (m->m_pkthdr.len > MHLEN) 614 n = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 615 else 616 n = m_gethdr(M_NOWAIT, MT_DATA); 617 if (n == NULL) 618 goto bad; 619 620 m_move_pkthdr(n, m); 621 m_copydata(m, 0, n->m_pkthdr.len, mtod(n, caddr_t)); 622 n->m_len = n->m_pkthdr.len; 623 m_freem(m); 624 m = n; 625 } 626 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), /* nothing */); 627 #endif 628 629 if (m->m_len < sizeof(struct ip6_hdr)) { 630 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 631 IP6STAT_INC(ip6s_toosmall); 632 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 633 goto bad; 634 } 635 } 636 637 ip6 = mtod(m, struct ip6_hdr *); 638 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 639 IP6STAT_INC(ip6s_badvers); 640 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 641 goto bad; 642 } 643 644 IP6STAT_INC(ip6s_nxthist[ip6->ip6_nxt]); 645 IP_PROBE(receive, NULL, NULL, ip6, rcvif, NULL, ip6); 646 647 /* 648 * Check against address spoofing/corruption. 649 */ 650 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) || 651 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) { 652 /* 653 * XXX: "badscope" is not very suitable for a multicast source. 654 */ 655 IP6STAT_INC(ip6s_badscope); 656 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 657 goto bad; 658 } 659 if (IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) && 660 !(m->m_flags & M_LOOP)) { 661 /* 662 * In this case, the packet should come from the loopback 663 * interface. However, we cannot just check the if_flags, 664 * because ip6_mloopback() passes the "actual" interface 665 * as the outgoing/incoming interface. 666 */ 667 IP6STAT_INC(ip6s_badscope); 668 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 669 goto bad; 670 } 671 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && 672 IPV6_ADDR_MC_SCOPE(&ip6->ip6_dst) == 0) { 673 /* 674 * RFC4291 2.7: 675 * Nodes must not originate a packet to a multicast address 676 * whose scop field contains the reserved value 0; if such 677 * a packet is received, it must be silently dropped. 678 */ 679 IP6STAT_INC(ip6s_badscope); 680 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 681 goto bad; 682 } 683 #ifdef ALTQ 684 if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) { 685 /* packet is dropped by traffic conditioner */ 686 return; 687 } 688 #endif 689 /* 690 * The following check is not documented in specs. A malicious 691 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack 692 * and bypass security checks (act as if it was from 127.0.0.1 by using 693 * IPv6 src ::ffff:127.0.0.1). Be cautious. 694 * 695 * This check chokes if we are in an SIIT cloud. As none of BSDs 696 * support IPv4-less kernel compilation, we cannot support SIIT 697 * environment at all. So, it makes more sense for us to reject any 698 * malicious packets for non-SIIT environment, than try to do a 699 * partial support for SIIT environment. 700 */ 701 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 702 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 703 IP6STAT_INC(ip6s_badscope); 704 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 705 goto bad; 706 } 707 #if 0 708 /* 709 * Reject packets with IPv4 compatible addresses (auto tunnel). 710 * 711 * The code forbids auto tunnel relay case in RFC1933 (the check is 712 * stronger than RFC1933). We may want to re-enable it if mech-xx 713 * is revised to forbid relaying case. 714 */ 715 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) || 716 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) { 717 IP6STAT_INC(ip6s_badscope); 718 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 719 goto bad; 720 } 721 #endif 722 /* 723 * Try to forward the packet, but if we fail continue. 724 * ip6_tryforward() does not generate redirects, so fall 725 * through to normal processing if redirects are required. 726 * ip6_tryforward() does inbound and outbound packet firewall 727 * processing. If firewall has decided that destination becomes 728 * our local address, it sets M_FASTFWD_OURS flag. In this 729 * case skip another inbound firewall processing and update 730 * ip6 pointer. 731 */ 732 if (V_ip6_forwarding != 0 && V_ip6_sendredirects == 0 733 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 734 && (!IPSEC_ENABLED(ipv6) || 735 IPSEC_CAPS(ipv6, m, IPSEC_CAP_OPERABLE) == 0) 736 #endif 737 ) { 738 if ((m = ip6_tryforward(m)) == NULL) 739 return; 740 if (m->m_flags & M_FASTFWD_OURS) { 741 ip6 = mtod(m, struct ip6_hdr *); 742 goto passin; 743 } 744 } 745 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 746 /* 747 * Bypass packet filtering for packets previously handled by IPsec. 748 */ 749 if (IPSEC_ENABLED(ipv6) && 750 IPSEC_CAPS(ipv6, m, IPSEC_CAP_BYPASS_FILTER) != 0) 751 goto passin; 752 #endif 753 /* 754 * Run through list of hooks for input packets. 755 * 756 * NB: Beware of the destination address changing 757 * (e.g. by NAT rewriting). When this happens, 758 * tell ip6_forward to do the right thing. 759 */ 760 761 /* Jump over all PFIL processing if hooks are not active. */ 762 if (!PFIL_HOOKED_IN(V_inet6_pfil_head)) 763 goto passin; 764 765 odst = ip6->ip6_dst; 766 if (pfil_run_hooks(V_inet6_pfil_head, &m, m->m_pkthdr.rcvif, PFIL_IN, 767 NULL) != PFIL_PASS) 768 return; 769 ip6 = mtod(m, struct ip6_hdr *); 770 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst); 771 if ((m->m_flags & (M_IP6_NEXTHOP | M_FASTFWD_OURS)) == M_IP6_NEXTHOP && 772 m_tag_find(m, PACKET_TAG_IPFORWARD, NULL) != NULL) { 773 /* 774 * Directly ship the packet on. This allows forwarding 775 * packets originally destined to us to some other directly 776 * connected host. 777 */ 778 ip6_forward(m, 1); 779 return; 780 } 781 782 passin: 783 /* 784 * Disambiguate address scope zones (if there is ambiguity). 785 * We first make sure that the original source or destination address 786 * is not in our internal form for scoped addresses. Such addresses 787 * are not necessarily invalid spec-wise, but we cannot accept them due 788 * to the usage conflict. 789 * in6_setscope() then also checks and rejects the cases where src or 790 * dst are the loopback address and the receiving interface 791 * is not loopback. 792 */ 793 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) { 794 IP6STAT_INC(ip6s_badscope); /* XXX */ 795 goto bad; 796 } 797 if (in6_setscope(&ip6->ip6_src, rcvif, NULL) || 798 in6_setscope(&ip6->ip6_dst, rcvif, NULL)) { 799 IP6STAT_INC(ip6s_badscope); 800 goto bad; 801 } 802 if (m->m_flags & M_FASTFWD_OURS) { 803 m->m_flags &= ~M_FASTFWD_OURS; 804 ours = 1; 805 goto hbhcheck; 806 } 807 /* 808 * Multicast check. Assume packet is for us to avoid 809 * prematurely taking locks. 810 */ 811 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 812 ours = 1; 813 in6_ifstat_inc(rcvif, ifs6_in_mcast); 814 goto hbhcheck; 815 } 816 /* 817 * Unicast check 818 * XXX: For now we keep link-local IPv6 addresses with embedded 819 * scope zone id, therefore we use zero zoneid here. 820 */ 821 ia = in6ifa_ifwithaddr(&ip6->ip6_dst, 0 /* XXX */); 822 if (ia != NULL) { 823 if (ia->ia6_flags & IN6_IFF_NOTREADY) { 824 char ip6bufs[INET6_ADDRSTRLEN]; 825 char ip6bufd[INET6_ADDRSTRLEN]; 826 /* address is not ready, so discard the packet. */ 827 nd6log((LOG_INFO, 828 "ip6_input: packet to an unready address %s->%s\n", 829 ip6_sprintf(ip6bufs, &ip6->ip6_src), 830 ip6_sprintf(ip6bufd, &ip6->ip6_dst))); 831 ifa_free(&ia->ia_ifa); 832 goto bad; 833 } 834 /* Count the packet in the ip address stats */ 835 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1); 836 counter_u64_add(ia->ia_ifa.ifa_ibytes, m->m_pkthdr.len); 837 ifa_free(&ia->ia_ifa); 838 ours = 1; 839 goto hbhcheck; 840 } 841 842 /* 843 * Now there is no reason to process the packet if it's not our own 844 * and we're not a router. 845 */ 846 if (!V_ip6_forwarding) { 847 IP6STAT_INC(ip6s_cantforward); 848 goto bad; 849 } 850 851 hbhcheck: 852 /* 853 * Process Hop-by-Hop options header if it's contained. 854 * m may be modified in ip6_hopopts_input(). 855 * If a JumboPayload option is included, plen will also be modified. 856 */ 857 plen = (u_int32_t)ntohs(ip6->ip6_plen); 858 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 859 if (ip6_input_hbh(&m, &plen, &rtalert, &off, &nxt, &ours) != 0) 860 return; 861 } else 862 nxt = ip6->ip6_nxt; 863 864 /* 865 * Use mbuf flags to propagate Router Alert option to 866 * ICMPv6 layer, as hop-by-hop options have been stripped. 867 */ 868 if (rtalert != ~0) 869 m->m_flags |= M_RTALERT_MLD; 870 871 /* 872 * Check that the amount of data in the buffers 873 * is as at least much as the IPv6 header would have us expect. 874 * Trim mbufs if longer than we expect. 875 * Drop packet if shorter than we expect. 876 */ 877 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 878 IP6STAT_INC(ip6s_tooshort); 879 in6_ifstat_inc(rcvif, ifs6_in_truncated); 880 goto bad; 881 } 882 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 883 if (m->m_len == m->m_pkthdr.len) { 884 m->m_len = sizeof(struct ip6_hdr) + plen; 885 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 886 } else 887 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 888 } 889 890 /* 891 * Forward if desirable. 892 */ 893 if (V_ip6_mrouter && 894 IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 895 /* 896 * If we are acting as a multicast router, all 897 * incoming multicast packets are passed to the 898 * kernel-level multicast forwarding function. 899 * The packet is returned (relatively) intact; if 900 * ip6_mforward() returns a non-zero value, the packet 901 * must be discarded, else it may be accepted below. 902 * 903 * XXX TODO: Check hlim and multicast scope here to avoid 904 * unnecessarily calling into ip6_mforward(). 905 */ 906 if (ip6_mforward && ip6_mforward(ip6, rcvif, m)) { 907 IP6STAT_INC(ip6s_cantforward); 908 goto bad; 909 } 910 } else if (!ours) { 911 ip6_forward(m, srcrt); 912 return; 913 } 914 915 ip6 = mtod(m, struct ip6_hdr *); 916 917 /* 918 * Malicious party may be able to use IPv4 mapped addr to confuse 919 * tcp/udp stack and bypass security checks (act as if it was from 920 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious. 921 * 922 * For SIIT end node behavior, you may want to disable the check. 923 * However, you will become vulnerable to attacks using IPv4 mapped 924 * source. 925 */ 926 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 927 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 928 IP6STAT_INC(ip6s_badscope); 929 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 930 goto bad; 931 } 932 933 /* 934 * Tell launch routine the next header 935 */ 936 IP6STAT_INC(ip6s_delivered); 937 in6_ifstat_inc(rcvif, ifs6_in_deliver); 938 nest = 0; 939 940 while (nxt != IPPROTO_DONE) { 941 if (V_ip6_hdrnestlimit && (++nest > V_ip6_hdrnestlimit)) { 942 IP6STAT_INC(ip6s_toomanyhdr); 943 goto bad; 944 } 945 946 /* 947 * protection against faulty packet - there should be 948 * more sanity checks in header chain processing. 949 */ 950 if (m->m_pkthdr.len < off) { 951 IP6STAT_INC(ip6s_tooshort); 952 in6_ifstat_inc(rcvif, ifs6_in_truncated); 953 goto bad; 954 } 955 956 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 957 if (IPSEC_ENABLED(ipv6)) { 958 if (IPSEC_INPUT(ipv6, m, off, nxt) != 0) 959 return; 960 } 961 #endif /* IPSEC */ 962 963 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt); 964 } 965 return; 966 bad: 967 in6_ifstat_inc(rcvif, ifs6_in_discard); 968 if (m != NULL) 969 m_freem(m); 970 } 971 972 /* 973 * Hop-by-Hop options header processing. If a valid jumbo payload option is 974 * included, the real payload length will be stored in plenp. 975 * 976 * rtalertp - XXX: should be stored more smart way 977 */ 978 static int 979 ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp, 980 struct mbuf **mp, int *offp) 981 { 982 struct mbuf *m = *mp; 983 int off = *offp, hbhlen; 984 struct ip6_hbh *hbh; 985 986 /* validation of the length of the header */ 987 #ifndef PULLDOWN_TEST 988 IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1); 989 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); 990 hbhlen = (hbh->ip6h_len + 1) << 3; 991 992 IP6_EXTHDR_CHECK(m, off, hbhlen, -1); 993 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); 994 #else 995 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, 996 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh)); 997 if (hbh == NULL) { 998 IP6STAT_INC(ip6s_tooshort); 999 return -1; 1000 } 1001 hbhlen = (hbh->ip6h_len + 1) << 3; 1002 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 1003 hbhlen); 1004 if (hbh == NULL) { 1005 IP6STAT_INC(ip6s_tooshort); 1006 return -1; 1007 } 1008 #endif 1009 off += hbhlen; 1010 hbhlen -= sizeof(struct ip6_hbh); 1011 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 1012 hbhlen, rtalertp, plenp) < 0) 1013 return (-1); 1014 1015 *offp = off; 1016 *mp = m; 1017 return (0); 1018 } 1019 1020 /* 1021 * Search header for all Hop-by-hop options and process each option. 1022 * This function is separate from ip6_hopopts_input() in order to 1023 * handle a case where the sending node itself process its hop-by-hop 1024 * options header. In such a case, the function is called from ip6_output(). 1025 * 1026 * The function assumes that hbh header is located right after the IPv6 header 1027 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to 1028 * opthead + hbhlen is located in contiguous memory region. 1029 */ 1030 int 1031 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen, 1032 u_int32_t *rtalertp, u_int32_t *plenp) 1033 { 1034 struct ip6_hdr *ip6; 1035 int optlen = 0; 1036 u_int8_t *opt = opthead; 1037 u_int16_t rtalert_val; 1038 u_int32_t jumboplen; 1039 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh); 1040 1041 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 1042 switch (*opt) { 1043 case IP6OPT_PAD1: 1044 optlen = 1; 1045 break; 1046 case IP6OPT_PADN: 1047 if (hbhlen < IP6OPT_MINLEN) { 1048 IP6STAT_INC(ip6s_toosmall); 1049 goto bad; 1050 } 1051 optlen = *(opt + 1) + 2; 1052 break; 1053 case IP6OPT_ROUTER_ALERT: 1054 /* XXX may need check for alignment */ 1055 if (hbhlen < IP6OPT_RTALERT_LEN) { 1056 IP6STAT_INC(ip6s_toosmall); 1057 goto bad; 1058 } 1059 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) { 1060 /* XXX stat */ 1061 icmp6_error(m, ICMP6_PARAM_PROB, 1062 ICMP6_PARAMPROB_HEADER, 1063 erroff + opt + 1 - opthead); 1064 return (-1); 1065 } 1066 optlen = IP6OPT_RTALERT_LEN; 1067 bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2); 1068 *rtalertp = ntohs(rtalert_val); 1069 break; 1070 case IP6OPT_JUMBO: 1071 /* XXX may need check for alignment */ 1072 if (hbhlen < IP6OPT_JUMBO_LEN) { 1073 IP6STAT_INC(ip6s_toosmall); 1074 goto bad; 1075 } 1076 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) { 1077 /* XXX stat */ 1078 icmp6_error(m, ICMP6_PARAM_PROB, 1079 ICMP6_PARAMPROB_HEADER, 1080 erroff + opt + 1 - opthead); 1081 return (-1); 1082 } 1083 optlen = IP6OPT_JUMBO_LEN; 1084 1085 /* 1086 * IPv6 packets that have non 0 payload length 1087 * must not contain a jumbo payload option. 1088 */ 1089 ip6 = mtod(m, struct ip6_hdr *); 1090 if (ip6->ip6_plen) { 1091 IP6STAT_INC(ip6s_badoptions); 1092 icmp6_error(m, ICMP6_PARAM_PROB, 1093 ICMP6_PARAMPROB_HEADER, 1094 erroff + opt - opthead); 1095 return (-1); 1096 } 1097 1098 /* 1099 * We may see jumbolen in unaligned location, so 1100 * we'd need to perform bcopy(). 1101 */ 1102 bcopy(opt + 2, &jumboplen, sizeof(jumboplen)); 1103 jumboplen = (u_int32_t)htonl(jumboplen); 1104 1105 #if 1 1106 /* 1107 * if there are multiple jumbo payload options, 1108 * *plenp will be non-zero and the packet will be 1109 * rejected. 1110 * the behavior may need some debate in ipngwg - 1111 * multiple options does not make sense, however, 1112 * there's no explicit mention in specification. 1113 */ 1114 if (*plenp != 0) { 1115 IP6STAT_INC(ip6s_badoptions); 1116 icmp6_error(m, ICMP6_PARAM_PROB, 1117 ICMP6_PARAMPROB_HEADER, 1118 erroff + opt + 2 - opthead); 1119 return (-1); 1120 } 1121 #endif 1122 1123 /* 1124 * jumbo payload length must be larger than 65535. 1125 */ 1126 if (jumboplen <= IPV6_MAXPACKET) { 1127 IP6STAT_INC(ip6s_badoptions); 1128 icmp6_error(m, ICMP6_PARAM_PROB, 1129 ICMP6_PARAMPROB_HEADER, 1130 erroff + opt + 2 - opthead); 1131 return (-1); 1132 } 1133 *plenp = jumboplen; 1134 1135 break; 1136 default: /* unknown option */ 1137 if (hbhlen < IP6OPT_MINLEN) { 1138 IP6STAT_INC(ip6s_toosmall); 1139 goto bad; 1140 } 1141 optlen = ip6_unknown_opt(opt, m, 1142 erroff + opt - opthead); 1143 if (optlen == -1) 1144 return (-1); 1145 optlen += 2; 1146 break; 1147 } 1148 } 1149 1150 return (0); 1151 1152 bad: 1153 m_freem(m); 1154 return (-1); 1155 } 1156 1157 /* 1158 * Unknown option processing. 1159 * The third argument `off' is the offset from the IPv6 header to the option, 1160 * which is necessary if the IPv6 header the and option header and IPv6 header 1161 * is not contiguous in order to return an ICMPv6 error. 1162 */ 1163 int 1164 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off) 1165 { 1166 struct ip6_hdr *ip6; 1167 1168 switch (IP6OPT_TYPE(*optp)) { 1169 case IP6OPT_TYPE_SKIP: /* ignore the option */ 1170 return ((int)*(optp + 1)); 1171 case IP6OPT_TYPE_DISCARD: /* silently discard */ 1172 m_freem(m); 1173 return (-1); 1174 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 1175 IP6STAT_INC(ip6s_badoptions); 1176 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 1177 return (-1); 1178 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 1179 IP6STAT_INC(ip6s_badoptions); 1180 ip6 = mtod(m, struct ip6_hdr *); 1181 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 1182 (m->m_flags & (M_BCAST|M_MCAST))) 1183 m_freem(m); 1184 else 1185 icmp6_error(m, ICMP6_PARAM_PROB, 1186 ICMP6_PARAMPROB_OPTION, off); 1187 return (-1); 1188 } 1189 1190 m_freem(m); /* XXX: NOTREACHED */ 1191 return (-1); 1192 } 1193 1194 /* 1195 * Create the "control" list for this pcb. 1196 * These functions will not modify mbuf chain at all. 1197 * 1198 * With KAME mbuf chain restriction: 1199 * The routine will be called from upper layer handlers like tcp6_input(). 1200 * Thus the routine assumes that the caller (tcp6_input) have already 1201 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the 1202 * very first mbuf on the mbuf chain. 1203 * 1204 * ip6_savecontrol_v4 will handle those options that are possible to be 1205 * set on a v4-mapped socket. 1206 * ip6_savecontrol will directly call ip6_savecontrol_v4 to handle those 1207 * options and handle the v6-only ones itself. 1208 */ 1209 struct mbuf ** 1210 ip6_savecontrol_v4(struct inpcb *inp, struct mbuf *m, struct mbuf **mp, 1211 int *v4only) 1212 { 1213 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1214 1215 #ifdef SO_TIMESTAMP 1216 if ((inp->inp_socket->so_options & SO_TIMESTAMP) != 0) { 1217 union { 1218 struct timeval tv; 1219 struct bintime bt; 1220 struct timespec ts; 1221 } t; 1222 struct bintime boottimebin, bt1; 1223 struct timespec ts1; 1224 bool stamped; 1225 1226 stamped = false; 1227 switch (inp->inp_socket->so_ts_clock) { 1228 case SO_TS_REALTIME_MICRO: 1229 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1230 M_TSTMP)) { 1231 mbuf_tstmp2timespec(m, &ts1); 1232 timespec2bintime(&ts1, &bt1); 1233 getboottimebin(&boottimebin); 1234 bintime_add(&bt1, &boottimebin); 1235 bintime2timeval(&bt1, &t.tv); 1236 } else { 1237 microtime(&t.tv); 1238 } 1239 *mp = sbcreatecontrol((caddr_t) &t.tv, sizeof(t.tv), 1240 SCM_TIMESTAMP, SOL_SOCKET); 1241 if (*mp != NULL) { 1242 mp = &(*mp)->m_next; 1243 stamped = true; 1244 } 1245 break; 1246 1247 case SO_TS_BINTIME: 1248 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1249 M_TSTMP)) { 1250 mbuf_tstmp2timespec(m, &ts1); 1251 timespec2bintime(&ts1, &t.bt); 1252 getboottimebin(&boottimebin); 1253 bintime_add(&t.bt, &boottimebin); 1254 } else { 1255 bintime(&t.bt); 1256 } 1257 *mp = sbcreatecontrol((caddr_t)&t.bt, sizeof(t.bt), 1258 SCM_BINTIME, SOL_SOCKET); 1259 if (*mp != NULL) { 1260 mp = &(*mp)->m_next; 1261 stamped = true; 1262 } 1263 break; 1264 1265 case SO_TS_REALTIME: 1266 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1267 M_TSTMP)) { 1268 mbuf_tstmp2timespec(m, &t.ts); 1269 getboottimebin(&boottimebin); 1270 bintime2timespec(&boottimebin, &ts1); 1271 timespecadd(&t.ts, &ts1, &t.ts); 1272 } else { 1273 nanotime(&t.ts); 1274 } 1275 *mp = sbcreatecontrol((caddr_t)&t.ts, sizeof(t.ts), 1276 SCM_REALTIME, SOL_SOCKET); 1277 if (*mp != NULL) { 1278 mp = &(*mp)->m_next; 1279 stamped = true; 1280 } 1281 break; 1282 1283 case SO_TS_MONOTONIC: 1284 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1285 M_TSTMP)) 1286 mbuf_tstmp2timespec(m, &t.ts); 1287 else 1288 nanouptime(&t.ts); 1289 *mp = sbcreatecontrol((caddr_t)&t.ts, sizeof(t.ts), 1290 SCM_MONOTONIC, SOL_SOCKET); 1291 if (*mp != NULL) { 1292 mp = &(*mp)->m_next; 1293 stamped = true; 1294 } 1295 break; 1296 1297 default: 1298 panic("unknown (corrupted) so_ts_clock"); 1299 } 1300 if (stamped && (m->m_flags & (M_PKTHDR | M_TSTMP)) == 1301 (M_PKTHDR | M_TSTMP)) { 1302 struct sock_timestamp_info sti; 1303 1304 bzero(&sti, sizeof(sti)); 1305 sti.st_info_flags = ST_INFO_HW; 1306 if ((m->m_flags & M_TSTMP_HPREC) != 0) 1307 sti.st_info_flags |= ST_INFO_HW_HPREC; 1308 *mp = sbcreatecontrol((caddr_t)&sti, sizeof(sti), 1309 SCM_TIME_INFO, SOL_SOCKET); 1310 if (*mp != NULL) 1311 mp = &(*mp)->m_next; 1312 } 1313 } 1314 #endif 1315 1316 #define IS2292(inp, x, y) (((inp)->inp_flags & IN6P_RFC2292) ? (x) : (y)) 1317 /* RFC 2292 sec. 5 */ 1318 if ((inp->inp_flags & IN6P_PKTINFO) != 0) { 1319 struct in6_pktinfo pi6; 1320 1321 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1322 #ifdef INET 1323 struct ip *ip; 1324 1325 ip = mtod(m, struct ip *); 1326 pi6.ipi6_addr.s6_addr32[0] = 0; 1327 pi6.ipi6_addr.s6_addr32[1] = 0; 1328 pi6.ipi6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP; 1329 pi6.ipi6_addr.s6_addr32[3] = ip->ip_dst.s_addr; 1330 #else 1331 /* We won't hit this code */ 1332 bzero(&pi6.ipi6_addr, sizeof(struct in6_addr)); 1333 #endif 1334 } else { 1335 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr)); 1336 in6_clearscope(&pi6.ipi6_addr); /* XXX */ 1337 } 1338 pi6.ipi6_ifindex = 1339 (m && m->m_pkthdr.rcvif) ? m->m_pkthdr.rcvif->if_index : 0; 1340 1341 *mp = sbcreatecontrol((caddr_t) &pi6, 1342 sizeof(struct in6_pktinfo), 1343 IS2292(inp, IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6); 1344 if (*mp) 1345 mp = &(*mp)->m_next; 1346 } 1347 1348 if ((inp->inp_flags & IN6P_HOPLIMIT) != 0) { 1349 int hlim; 1350 1351 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1352 #ifdef INET 1353 struct ip *ip; 1354 1355 ip = mtod(m, struct ip *); 1356 hlim = ip->ip_ttl; 1357 #else 1358 /* We won't hit this code */ 1359 hlim = 0; 1360 #endif 1361 } else { 1362 hlim = ip6->ip6_hlim & 0xff; 1363 } 1364 *mp = sbcreatecontrol((caddr_t) &hlim, sizeof(int), 1365 IS2292(inp, IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), 1366 IPPROTO_IPV6); 1367 if (*mp) 1368 mp = &(*mp)->m_next; 1369 } 1370 1371 if ((inp->inp_flags & IN6P_TCLASS) != 0) { 1372 int tclass; 1373 1374 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1375 #ifdef INET 1376 struct ip *ip; 1377 1378 ip = mtod(m, struct ip *); 1379 tclass = ip->ip_tos; 1380 #else 1381 /* We won't hit this code */ 1382 tclass = 0; 1383 #endif 1384 } else { 1385 u_int32_t flowinfo; 1386 1387 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK); 1388 flowinfo >>= 20; 1389 tclass = flowinfo & 0xff; 1390 } 1391 *mp = sbcreatecontrol((caddr_t) &tclass, sizeof(int), 1392 IPV6_TCLASS, IPPROTO_IPV6); 1393 if (*mp) 1394 mp = &(*mp)->m_next; 1395 } 1396 1397 if (v4only != NULL) { 1398 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1399 *v4only = 1; 1400 } else { 1401 *v4only = 0; 1402 } 1403 } 1404 1405 return (mp); 1406 } 1407 1408 void 1409 ip6_savecontrol(struct inpcb *inp, struct mbuf *m, struct mbuf **mp) 1410 { 1411 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1412 int v4only = 0; 1413 1414 mp = ip6_savecontrol_v4(inp, m, mp, &v4only); 1415 if (v4only) 1416 return; 1417 1418 /* 1419 * IPV6_HOPOPTS socket option. Recall that we required super-user 1420 * privilege for the option (see ip6_ctloutput), but it might be too 1421 * strict, since there might be some hop-by-hop options which can be 1422 * returned to normal user. 1423 * See also RFC 2292 section 6 (or RFC 3542 section 8). 1424 */ 1425 if ((inp->inp_flags & IN6P_HOPOPTS) != 0) { 1426 /* 1427 * Check if a hop-by-hop options header is contatined in the 1428 * received packet, and if so, store the options as ancillary 1429 * data. Note that a hop-by-hop options header must be 1430 * just after the IPv6 header, which is assured through the 1431 * IPv6 input processing. 1432 */ 1433 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 1434 struct ip6_hbh *hbh; 1435 int hbhlen = 0; 1436 #ifdef PULLDOWN_TEST 1437 struct mbuf *ext; 1438 #endif 1439 1440 #ifndef PULLDOWN_TEST 1441 hbh = (struct ip6_hbh *)(ip6 + 1); 1442 hbhlen = (hbh->ip6h_len + 1) << 3; 1443 #else 1444 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr), 1445 ip6->ip6_nxt); 1446 if (ext == NULL) { 1447 IP6STAT_INC(ip6s_tooshort); 1448 return; 1449 } 1450 hbh = mtod(ext, struct ip6_hbh *); 1451 hbhlen = (hbh->ip6h_len + 1) << 3; 1452 if (hbhlen != ext->m_len) { 1453 m_freem(ext); 1454 IP6STAT_INC(ip6s_tooshort); 1455 return; 1456 } 1457 #endif 1458 1459 /* 1460 * XXX: We copy the whole header even if a 1461 * jumbo payload option is included, the option which 1462 * is to be removed before returning according to 1463 * RFC2292. 1464 * Note: this constraint is removed in RFC3542 1465 */ 1466 *mp = sbcreatecontrol((caddr_t)hbh, hbhlen, 1467 IS2292(inp, IPV6_2292HOPOPTS, IPV6_HOPOPTS), 1468 IPPROTO_IPV6); 1469 if (*mp) 1470 mp = &(*mp)->m_next; 1471 #ifdef PULLDOWN_TEST 1472 m_freem(ext); 1473 #endif 1474 } 1475 } 1476 1477 if ((inp->inp_flags & (IN6P_RTHDR | IN6P_DSTOPTS)) != 0) { 1478 int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr); 1479 1480 /* 1481 * Search for destination options headers or routing 1482 * header(s) through the header chain, and stores each 1483 * header as ancillary data. 1484 * Note that the order of the headers remains in 1485 * the chain of ancillary data. 1486 */ 1487 while (1) { /* is explicit loop prevention necessary? */ 1488 struct ip6_ext *ip6e = NULL; 1489 int elen; 1490 #ifdef PULLDOWN_TEST 1491 struct mbuf *ext = NULL; 1492 #endif 1493 1494 /* 1495 * if it is not an extension header, don't try to 1496 * pull it from the chain. 1497 */ 1498 switch (nxt) { 1499 case IPPROTO_DSTOPTS: 1500 case IPPROTO_ROUTING: 1501 case IPPROTO_HOPOPTS: 1502 case IPPROTO_AH: /* is it possible? */ 1503 break; 1504 default: 1505 goto loopend; 1506 } 1507 1508 #ifndef PULLDOWN_TEST 1509 if (off + sizeof(*ip6e) > m->m_len) 1510 goto loopend; 1511 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off); 1512 if (nxt == IPPROTO_AH) 1513 elen = (ip6e->ip6e_len + 2) << 2; 1514 else 1515 elen = (ip6e->ip6e_len + 1) << 3; 1516 if (off + elen > m->m_len) 1517 goto loopend; 1518 #else 1519 ext = ip6_pullexthdr(m, off, nxt); 1520 if (ext == NULL) { 1521 IP6STAT_INC(ip6s_tooshort); 1522 return; 1523 } 1524 ip6e = mtod(ext, struct ip6_ext *); 1525 if (nxt == IPPROTO_AH) 1526 elen = (ip6e->ip6e_len + 2) << 2; 1527 else 1528 elen = (ip6e->ip6e_len + 1) << 3; 1529 if (elen != ext->m_len) { 1530 m_freem(ext); 1531 IP6STAT_INC(ip6s_tooshort); 1532 return; 1533 } 1534 #endif 1535 1536 switch (nxt) { 1537 case IPPROTO_DSTOPTS: 1538 if (!(inp->inp_flags & IN6P_DSTOPTS)) 1539 break; 1540 1541 *mp = sbcreatecontrol((caddr_t)ip6e, elen, 1542 IS2292(inp, 1543 IPV6_2292DSTOPTS, IPV6_DSTOPTS), 1544 IPPROTO_IPV6); 1545 if (*mp) 1546 mp = &(*mp)->m_next; 1547 break; 1548 case IPPROTO_ROUTING: 1549 if (!(inp->inp_flags & IN6P_RTHDR)) 1550 break; 1551 1552 *mp = sbcreatecontrol((caddr_t)ip6e, elen, 1553 IS2292(inp, IPV6_2292RTHDR, IPV6_RTHDR), 1554 IPPROTO_IPV6); 1555 if (*mp) 1556 mp = &(*mp)->m_next; 1557 break; 1558 case IPPROTO_HOPOPTS: 1559 case IPPROTO_AH: /* is it possible? */ 1560 break; 1561 1562 default: 1563 /* 1564 * other cases have been filtered in the above. 1565 * none will visit this case. here we supply 1566 * the code just in case (nxt overwritten or 1567 * other cases). 1568 */ 1569 #ifdef PULLDOWN_TEST 1570 m_freem(ext); 1571 #endif 1572 goto loopend; 1573 1574 } 1575 1576 /* proceed with the next header. */ 1577 off += elen; 1578 nxt = ip6e->ip6e_nxt; 1579 ip6e = NULL; 1580 #ifdef PULLDOWN_TEST 1581 m_freem(ext); 1582 ext = NULL; 1583 #endif 1584 } 1585 loopend: 1586 ; 1587 } 1588 1589 if (inp->inp_flags2 & INP_RECVFLOWID) { 1590 uint32_t flowid, flow_type; 1591 1592 flowid = m->m_pkthdr.flowid; 1593 flow_type = M_HASHTYPE_GET(m); 1594 1595 /* 1596 * XXX should handle the failure of one or the 1597 * other - don't populate both? 1598 */ 1599 *mp = sbcreatecontrol((caddr_t) &flowid, 1600 sizeof(uint32_t), IPV6_FLOWID, IPPROTO_IPV6); 1601 if (*mp) 1602 mp = &(*mp)->m_next; 1603 *mp = sbcreatecontrol((caddr_t) &flow_type, 1604 sizeof(uint32_t), IPV6_FLOWTYPE, IPPROTO_IPV6); 1605 if (*mp) 1606 mp = &(*mp)->m_next; 1607 } 1608 1609 #ifdef RSS 1610 if (inp->inp_flags2 & INP_RECVRSSBUCKETID) { 1611 uint32_t flowid, flow_type; 1612 uint32_t rss_bucketid; 1613 1614 flowid = m->m_pkthdr.flowid; 1615 flow_type = M_HASHTYPE_GET(m); 1616 1617 if (rss_hash2bucket(flowid, flow_type, &rss_bucketid) == 0) { 1618 *mp = sbcreatecontrol((caddr_t) &rss_bucketid, 1619 sizeof(uint32_t), IPV6_RSSBUCKETID, IPPROTO_IPV6); 1620 if (*mp) 1621 mp = &(*mp)->m_next; 1622 } 1623 } 1624 #endif 1625 1626 } 1627 #undef IS2292 1628 1629 void 1630 ip6_notify_pmtu(struct inpcb *inp, struct sockaddr_in6 *dst, u_int32_t mtu) 1631 { 1632 struct socket *so; 1633 struct mbuf *m_mtu; 1634 struct ip6_mtuinfo mtuctl; 1635 1636 KASSERT(inp != NULL, ("%s: inp == NULL", __func__)); 1637 /* 1638 * Notify the error by sending IPV6_PATHMTU ancillary data if 1639 * application wanted to know the MTU value. 1640 * NOTE: we notify disconnected sockets, because some udp 1641 * applications keep sending sockets disconnected. 1642 * NOTE: our implementation doesn't notify connected sockets that has 1643 * foreign address that is different than given destination addresses 1644 * (this is permitted by RFC 3542). 1645 */ 1646 if ((inp->inp_flags & IN6P_MTU) == 0 || ( 1647 !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 1648 !IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &dst->sin6_addr))) 1649 return; 1650 1651 mtuctl.ip6m_mtu = mtu; 1652 mtuctl.ip6m_addr = *dst; 1653 if (sa6_recoverscope(&mtuctl.ip6m_addr)) 1654 return; 1655 1656 if ((m_mtu = sbcreatecontrol((caddr_t)&mtuctl, sizeof(mtuctl), 1657 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL) 1658 return; 1659 1660 so = inp->inp_socket; 1661 if (sbappendaddr(&so->so_rcv, (struct sockaddr *)dst, NULL, m_mtu) 1662 == 0) { 1663 m_freem(m_mtu); 1664 /* XXX: should count statistics */ 1665 } else 1666 sorwakeup(so); 1667 } 1668 1669 #ifdef PULLDOWN_TEST 1670 /* 1671 * pull single extension header from mbuf chain. returns single mbuf that 1672 * contains the result, or NULL on error. 1673 */ 1674 static struct mbuf * 1675 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt) 1676 { 1677 struct ip6_ext ip6e; 1678 size_t elen; 1679 struct mbuf *n; 1680 1681 #ifdef DIAGNOSTIC 1682 switch (nxt) { 1683 case IPPROTO_DSTOPTS: 1684 case IPPROTO_ROUTING: 1685 case IPPROTO_HOPOPTS: 1686 case IPPROTO_AH: /* is it possible? */ 1687 break; 1688 default: 1689 printf("ip6_pullexthdr: invalid nxt=%d\n", nxt); 1690 } 1691 #endif 1692 1693 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1694 if (nxt == IPPROTO_AH) 1695 elen = (ip6e.ip6e_len + 2) << 2; 1696 else 1697 elen = (ip6e.ip6e_len + 1) << 3; 1698 1699 if (elen > MLEN) 1700 n = m_getcl(M_NOWAIT, MT_DATA, 0); 1701 else 1702 n = m_get(M_NOWAIT, MT_DATA); 1703 if (n == NULL) 1704 return NULL; 1705 1706 m_copydata(m, off, elen, mtod(n, caddr_t)); 1707 n->m_len = elen; 1708 return n; 1709 } 1710 #endif 1711 1712 /* 1713 * Get pointer to the previous header followed by the header 1714 * currently processed. 1715 */ 1716 int 1717 ip6_get_prevhdr(const struct mbuf *m, int off) 1718 { 1719 struct ip6_ext ip6e; 1720 struct ip6_hdr *ip6; 1721 int len, nlen, nxt; 1722 1723 if (off == sizeof(struct ip6_hdr)) 1724 return (offsetof(struct ip6_hdr, ip6_nxt)); 1725 if (off < sizeof(struct ip6_hdr)) 1726 panic("%s: off < sizeof(struct ip6_hdr)", __func__); 1727 1728 ip6 = mtod(m, struct ip6_hdr *); 1729 nxt = ip6->ip6_nxt; 1730 len = sizeof(struct ip6_hdr); 1731 nlen = 0; 1732 while (len < off) { 1733 m_copydata(m, len, sizeof(ip6e), (caddr_t)&ip6e); 1734 switch (nxt) { 1735 case IPPROTO_FRAGMENT: 1736 nlen = sizeof(struct ip6_frag); 1737 break; 1738 case IPPROTO_AH: 1739 nlen = (ip6e.ip6e_len + 2) << 2; 1740 break; 1741 default: 1742 nlen = (ip6e.ip6e_len + 1) << 3; 1743 } 1744 len += nlen; 1745 nxt = ip6e.ip6e_nxt; 1746 } 1747 return (len - nlen); 1748 } 1749 1750 /* 1751 * get next header offset. m will be retained. 1752 */ 1753 int 1754 ip6_nexthdr(const struct mbuf *m, int off, int proto, int *nxtp) 1755 { 1756 struct ip6_hdr ip6; 1757 struct ip6_ext ip6e; 1758 struct ip6_frag fh; 1759 1760 /* just in case */ 1761 if (m == NULL) 1762 panic("ip6_nexthdr: m == NULL"); 1763 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off) 1764 return -1; 1765 1766 switch (proto) { 1767 case IPPROTO_IPV6: 1768 if (m->m_pkthdr.len < off + sizeof(ip6)) 1769 return -1; 1770 m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6); 1771 if (nxtp) 1772 *nxtp = ip6.ip6_nxt; 1773 off += sizeof(ip6); 1774 return off; 1775 1776 case IPPROTO_FRAGMENT: 1777 /* 1778 * terminate parsing if it is not the first fragment, 1779 * it does not make sense to parse through it. 1780 */ 1781 if (m->m_pkthdr.len < off + sizeof(fh)) 1782 return -1; 1783 m_copydata(m, off, sizeof(fh), (caddr_t)&fh); 1784 /* IP6F_OFF_MASK = 0xfff8(BigEndian), 0xf8ff(LittleEndian) */ 1785 if (fh.ip6f_offlg & IP6F_OFF_MASK) 1786 return -1; 1787 if (nxtp) 1788 *nxtp = fh.ip6f_nxt; 1789 off += sizeof(struct ip6_frag); 1790 return off; 1791 1792 case IPPROTO_AH: 1793 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1794 return -1; 1795 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1796 if (nxtp) 1797 *nxtp = ip6e.ip6e_nxt; 1798 off += (ip6e.ip6e_len + 2) << 2; 1799 return off; 1800 1801 case IPPROTO_HOPOPTS: 1802 case IPPROTO_ROUTING: 1803 case IPPROTO_DSTOPTS: 1804 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1805 return -1; 1806 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1807 if (nxtp) 1808 *nxtp = ip6e.ip6e_nxt; 1809 off += (ip6e.ip6e_len + 1) << 3; 1810 return off; 1811 1812 case IPPROTO_NONE: 1813 case IPPROTO_ESP: 1814 case IPPROTO_IPCOMP: 1815 /* give up */ 1816 return -1; 1817 1818 default: 1819 return -1; 1820 } 1821 1822 /* NOTREACHED */ 1823 } 1824 1825 /* 1826 * get offset for the last header in the chain. m will be kept untainted. 1827 */ 1828 int 1829 ip6_lasthdr(const struct mbuf *m, int off, int proto, int *nxtp) 1830 { 1831 int newoff; 1832 int nxt; 1833 1834 if (!nxtp) { 1835 nxt = -1; 1836 nxtp = &nxt; 1837 } 1838 while (1) { 1839 newoff = ip6_nexthdr(m, off, proto, nxtp); 1840 if (newoff < 0) 1841 return off; 1842 else if (newoff < off) 1843 return -1; /* invalid */ 1844 else if (newoff == off) 1845 return newoff; 1846 1847 off = newoff; 1848 proto = *nxtp; 1849 } 1850 } 1851 1852 /* 1853 * System control for IP6 1854 */ 1855 1856 u_char inet6ctlerrmap[PRC_NCMDS] = { 1857 0, 0, 0, 0, 1858 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 1859 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 1860 EMSGSIZE, EHOSTUNREACH, 0, 0, 1861 0, 0, EHOSTUNREACH, 0, 1862 ENOPROTOOPT, ECONNREFUSED 1863 }; 1864