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(struct pfil_head, inet6_pfil_hook); 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 protosw *pr; 218 int i; 219 220 TUNABLE_INT_FETCH("net.inet6.ip6.auto_linklocal", 221 &V_ip6_auto_linklocal); 222 TUNABLE_INT_FETCH("net.inet6.ip6.accept_rtadv", &V_ip6_accept_rtadv); 223 TUNABLE_INT_FETCH("net.inet6.ip6.no_radr", &V_ip6_no_radr); 224 225 TAILQ_INIT(&V_in6_ifaddrhead); 226 V_in6_ifaddrhashtbl = hashinit(IN6ADDR_NHASH, M_IFADDR, 227 &V_in6_ifaddrhmask); 228 229 /* Initialize packet filter hooks. */ 230 V_inet6_pfil_hook.ph_type = PFIL_TYPE_AF; 231 V_inet6_pfil_hook.ph_af = AF_INET6; 232 if ((i = pfil_head_register(&V_inet6_pfil_hook)) != 0) 233 printf("%s: WARNING: unable to register pfil hook, " 234 "error %d\n", __func__, i); 235 236 if (hhook_head_register(HHOOK_TYPE_IPSEC_IN, AF_INET6, 237 &V_ipsec_hhh_in[HHOOK_IPSEC_INET6], 238 HHOOK_WAITOK | HHOOK_HEADISINVNET) != 0) 239 printf("%s: WARNING: unable to register input helper hook\n", 240 __func__); 241 if (hhook_head_register(HHOOK_TYPE_IPSEC_OUT, AF_INET6, 242 &V_ipsec_hhh_out[HHOOK_IPSEC_INET6], 243 HHOOK_WAITOK | HHOOK_HEADISINVNET) != 0) 244 printf("%s: WARNING: unable to register output helper hook\n", 245 __func__); 246 247 scope6_init(); 248 addrsel_policy_init(); 249 nd6_init(); 250 frag6_init(); 251 252 V_ip6_desync_factor = arc4random() % MAX_TEMP_DESYNC_FACTOR; 253 254 /* Skip global initialization stuff for non-default instances. */ 255 #ifdef VIMAGE 256 if (!IS_DEFAULT_VNET(curvnet)) { 257 netisr_register_vnet(&ip6_nh); 258 #ifdef RSS 259 netisr_register_vnet(&ip6_direct_nh); 260 #endif 261 return; 262 } 263 #endif 264 265 pr = pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 266 if (pr == NULL) 267 panic("ip6_init"); 268 269 /* Initialize the entire ip6_protox[] array to IPPROTO_RAW. */ 270 for (i = 0; i < IPPROTO_MAX; i++) 271 ip6_protox[i] = pr - inet6sw; 272 /* 273 * Cycle through IP protocols and put them into the appropriate place 274 * in ip6_protox[]. 275 */ 276 for (pr = inet6domain.dom_protosw; 277 pr < inet6domain.dom_protoswNPROTOSW; pr++) 278 if (pr->pr_domain->dom_family == PF_INET6 && 279 pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) { 280 /* Be careful to only index valid IP protocols. */ 281 if (pr->pr_protocol < IPPROTO_MAX) 282 ip6_protox[pr->pr_protocol] = pr - inet6sw; 283 } 284 285 netisr_register(&ip6_nh); 286 #ifdef RSS 287 netisr_register(&ip6_direct_nh); 288 #endif 289 } 290 291 /* 292 * The protocol to be inserted into ip6_protox[] must be already registered 293 * in inet6sw[], either statically or through pf_proto_register(). 294 */ 295 int 296 ip6proto_register(short ip6proto) 297 { 298 struct protosw *pr; 299 300 /* Sanity checks. */ 301 if (ip6proto <= 0 || ip6proto >= IPPROTO_MAX) 302 return (EPROTONOSUPPORT); 303 304 /* 305 * The protocol slot must not be occupied by another protocol 306 * already. An index pointing to IPPROTO_RAW is unused. 307 */ 308 pr = pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 309 if (pr == NULL) 310 return (EPFNOSUPPORT); 311 if (ip6_protox[ip6proto] != pr - inet6sw) /* IPPROTO_RAW */ 312 return (EEXIST); 313 314 /* 315 * Find the protocol position in inet6sw[] and set the index. 316 */ 317 for (pr = inet6domain.dom_protosw; 318 pr < inet6domain.dom_protoswNPROTOSW; pr++) { 319 if (pr->pr_domain->dom_family == PF_INET6 && 320 pr->pr_protocol && pr->pr_protocol == ip6proto) { 321 ip6_protox[pr->pr_protocol] = pr - inet6sw; 322 return (0); 323 } 324 } 325 return (EPROTONOSUPPORT); 326 } 327 328 int 329 ip6proto_unregister(short ip6proto) 330 { 331 struct protosw *pr; 332 333 /* Sanity checks. */ 334 if (ip6proto <= 0 || ip6proto >= IPPROTO_MAX) 335 return (EPROTONOSUPPORT); 336 337 /* Check if the protocol was indeed registered. */ 338 pr = pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 339 if (pr == NULL) 340 return (EPFNOSUPPORT); 341 if (ip6_protox[ip6proto] == pr - inet6sw) /* IPPROTO_RAW */ 342 return (ENOENT); 343 344 /* Reset the protocol slot to IPPROTO_RAW. */ 345 ip6_protox[ip6proto] = pr - inet6sw; 346 return (0); 347 } 348 349 #ifdef VIMAGE 350 static void 351 ip6_destroy(void *unused __unused) 352 { 353 struct ifaddr *ifa, *nifa; 354 struct ifnet *ifp; 355 int error; 356 357 #ifdef RSS 358 netisr_unregister_vnet(&ip6_direct_nh); 359 #endif 360 netisr_unregister_vnet(&ip6_nh); 361 362 if ((error = pfil_head_unregister(&V_inet6_pfil_hook)) != 0) 363 printf("%s: WARNING: unable to unregister pfil hook, " 364 "error %d\n", __func__, error); 365 error = hhook_head_deregister(V_ipsec_hhh_in[HHOOK_IPSEC_INET6]); 366 if (error != 0) { 367 printf("%s: WARNING: unable to deregister input helper hook " 368 "type HHOOK_TYPE_IPSEC_IN, id HHOOK_IPSEC_INET6: " 369 "error %d returned\n", __func__, error); 370 } 371 error = hhook_head_deregister(V_ipsec_hhh_out[HHOOK_IPSEC_INET6]); 372 if (error != 0) { 373 printf("%s: WARNING: unable to deregister output helper hook " 374 "type HHOOK_TYPE_IPSEC_OUT, id HHOOK_IPSEC_INET6: " 375 "error %d returned\n", __func__, error); 376 } 377 378 /* Cleanup addresses. */ 379 IFNET_RLOCK(); 380 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 381 /* Cannot lock here - lock recursion. */ 382 /* IF_ADDR_LOCK(ifp); */ 383 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, nifa) { 384 385 if (ifa->ifa_addr->sa_family != AF_INET6) 386 continue; 387 in6_purgeaddr(ifa); 388 } 389 /* IF_ADDR_UNLOCK(ifp); */ 390 in6_ifdetach_destroy(ifp); 391 mld_domifdetach(ifp); 392 /* Make sure any routes are gone as well. */ 393 rt_flushifroutes_af(ifp, AF_INET6); 394 } 395 IFNET_RUNLOCK(); 396 397 nd6_destroy(); 398 in6_ifattach_destroy(); 399 400 hashdestroy(V_in6_ifaddrhashtbl, M_IFADDR, V_in6_ifaddrhmask); 401 } 402 403 VNET_SYSUNINIT(inet6, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, ip6_destroy, NULL); 404 #endif 405 406 static int 407 ip6_input_hbh(struct mbuf *m, uint32_t *plen, uint32_t *rtalert, int *off, 408 int *nxt, int *ours) 409 { 410 struct ip6_hdr *ip6; 411 struct ip6_hbh *hbh; 412 413 if (ip6_hopopts_input(plen, rtalert, &m, off)) { 414 #if 0 /*touches NULL pointer*/ 415 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 416 #endif 417 goto out; /* m have already been freed */ 418 } 419 420 /* adjust pointer */ 421 ip6 = mtod(m, struct ip6_hdr *); 422 423 /* 424 * if the payload length field is 0 and the next header field 425 * indicates Hop-by-Hop Options header, then a Jumbo Payload 426 * option MUST be included. 427 */ 428 if (ip6->ip6_plen == 0 && *plen == 0) { 429 /* 430 * Note that if a valid jumbo payload option is 431 * contained, ip6_hopopts_input() must set a valid 432 * (non-zero) payload length to the variable plen. 433 */ 434 IP6STAT_INC(ip6s_badoptions); 435 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 436 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 437 icmp6_error(m, ICMP6_PARAM_PROB, 438 ICMP6_PARAMPROB_HEADER, 439 (caddr_t)&ip6->ip6_plen - (caddr_t)ip6); 440 goto out; 441 } 442 #ifndef PULLDOWN_TEST 443 /* ip6_hopopts_input() ensures that mbuf is contiguous */ 444 hbh = (struct ip6_hbh *)(ip6 + 1); 445 #else 446 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 447 sizeof(struct ip6_hbh)); 448 if (hbh == NULL) { 449 IP6STAT_INC(ip6s_tooshort); 450 goto out; 451 } 452 #endif 453 *nxt = hbh->ip6h_nxt; 454 455 /* 456 * If we are acting as a router and the packet contains a 457 * router alert option, see if we know the option value. 458 * Currently, we only support the option value for MLD, in which 459 * case we should pass the packet to the multicast routing 460 * daemon. 461 */ 462 if (*rtalert != ~0) { 463 switch (*rtalert) { 464 case IP6OPT_RTALERT_MLD: 465 if (V_ip6_forwarding) 466 *ours = 1; 467 break; 468 default: 469 /* 470 * RFC2711 requires unrecognized values must be 471 * silently ignored. 472 */ 473 break; 474 } 475 } 476 477 return (0); 478 479 out: 480 return (1); 481 } 482 483 #ifdef RSS 484 /* 485 * IPv6 direct input routine. 486 * 487 * This is called when reinjecting completed fragments where 488 * all of the previous checking and book-keeping has been done. 489 */ 490 void 491 ip6_direct_input(struct mbuf *m) 492 { 493 int off, nxt; 494 int nest; 495 struct m_tag *mtag; 496 struct ip6_direct_ctx *ip6dc; 497 498 mtag = m_tag_locate(m, MTAG_ABI_IPV6, IPV6_TAG_DIRECT, NULL); 499 KASSERT(mtag != NULL, ("Reinjected packet w/o direct ctx tag!")); 500 501 ip6dc = (struct ip6_direct_ctx *)(mtag + 1); 502 nxt = ip6dc->ip6dc_nxt; 503 off = ip6dc->ip6dc_off; 504 505 nest = 0; 506 507 m_tag_delete(m, mtag); 508 509 while (nxt != IPPROTO_DONE) { 510 if (V_ip6_hdrnestlimit && (++nest > V_ip6_hdrnestlimit)) { 511 IP6STAT_INC(ip6s_toomanyhdr); 512 goto bad; 513 } 514 515 /* 516 * protection against faulty packet - there should be 517 * more sanity checks in header chain processing. 518 */ 519 if (m->m_pkthdr.len < off) { 520 IP6STAT_INC(ip6s_tooshort); 521 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 522 goto bad; 523 } 524 525 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 526 if (IPSEC_ENABLED(ipv6)) { 527 if (IPSEC_INPUT(ipv6, m, off, nxt) != 0) 528 return; 529 } 530 #endif /* IPSEC */ 531 532 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt); 533 } 534 return; 535 bad: 536 m_freem(m); 537 } 538 #endif 539 540 void 541 ip6_input(struct mbuf *m) 542 { 543 struct in6_addr odst; 544 struct ip6_hdr *ip6; 545 struct in6_ifaddr *ia; 546 struct ifnet *rcvif; 547 u_int32_t plen; 548 u_int32_t rtalert = ~0; 549 int off = sizeof(struct ip6_hdr), nest; 550 int nxt, ours = 0; 551 int srcrt = 0; 552 553 /* 554 * Drop the packet if IPv6 operation is disabled on the interface. 555 */ 556 rcvif = m->m_pkthdr.rcvif; 557 if ((ND_IFINFO(rcvif)->flags & ND6_IFF_IFDISABLED)) 558 goto bad; 559 560 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 561 /* 562 * should the inner packet be considered authentic? 563 * see comment in ah4_input(). 564 * NB: m cannot be NULL when passed to the input routine 565 */ 566 567 m->m_flags &= ~M_AUTHIPHDR; 568 m->m_flags &= ~M_AUTHIPDGM; 569 570 #endif /* IPSEC */ 571 572 if (m->m_flags & M_FASTFWD_OURS) { 573 /* 574 * Firewall changed destination to local. 575 */ 576 m->m_flags &= ~M_FASTFWD_OURS; 577 ours = 1; 578 ip6 = mtod(m, struct ip6_hdr *); 579 goto hbhcheck; 580 } 581 582 /* 583 * mbuf statistics 584 */ 585 if (m->m_flags & M_EXT) { 586 if (m->m_next) 587 IP6STAT_INC(ip6s_mext2m); 588 else 589 IP6STAT_INC(ip6s_mext1); 590 } else { 591 if (m->m_next) { 592 if (m->m_flags & M_LOOP) { 593 IP6STAT_INC(ip6s_m2m[V_loif->if_index]); 594 } else if (rcvif->if_index < IP6S_M2MMAX) 595 IP6STAT_INC(ip6s_m2m[rcvif->if_index]); 596 else 597 IP6STAT_INC(ip6s_m2m[0]); 598 } else 599 IP6STAT_INC(ip6s_m1); 600 } 601 602 in6_ifstat_inc(rcvif, ifs6_in_receive); 603 IP6STAT_INC(ip6s_total); 604 605 #ifndef PULLDOWN_TEST 606 /* 607 * L2 bridge code and some other code can return mbuf chain 608 * that does not conform to KAME requirement. too bad. 609 * XXX: fails to join if interface MTU > MCLBYTES. jumbogram? 610 */ 611 if (m && m->m_next != NULL && m->m_pkthdr.len < MCLBYTES) { 612 struct mbuf *n; 613 614 if (m->m_pkthdr.len > MHLEN) 615 n = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 616 else 617 n = m_gethdr(M_NOWAIT, MT_DATA); 618 if (n == NULL) 619 goto bad; 620 621 m_move_pkthdr(n, m); 622 m_copydata(m, 0, n->m_pkthdr.len, mtod(n, caddr_t)); 623 n->m_len = n->m_pkthdr.len; 624 m_freem(m); 625 m = n; 626 } 627 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), /* nothing */); 628 #endif 629 630 if (m->m_len < sizeof(struct ip6_hdr)) { 631 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 632 IP6STAT_INC(ip6s_toosmall); 633 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 634 goto bad; 635 } 636 } 637 638 ip6 = mtod(m, struct ip6_hdr *); 639 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 640 IP6STAT_INC(ip6s_badvers); 641 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 642 goto bad; 643 } 644 645 IP6STAT_INC(ip6s_nxthist[ip6->ip6_nxt]); 646 IP_PROBE(receive, NULL, NULL, ip6, rcvif, NULL, ip6); 647 648 /* 649 * Check against address spoofing/corruption. 650 */ 651 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) || 652 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) { 653 /* 654 * XXX: "badscope" is not very suitable for a multicast source. 655 */ 656 IP6STAT_INC(ip6s_badscope); 657 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 658 goto bad; 659 } 660 if (IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) && 661 !(m->m_flags & M_LOOP)) { 662 /* 663 * In this case, the packet should come from the loopback 664 * interface. However, we cannot just check the if_flags, 665 * because ip6_mloopback() passes the "actual" interface 666 * as the outgoing/incoming interface. 667 */ 668 IP6STAT_INC(ip6s_badscope); 669 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 670 goto bad; 671 } 672 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && 673 IPV6_ADDR_MC_SCOPE(&ip6->ip6_dst) == 0) { 674 /* 675 * RFC4291 2.7: 676 * Nodes must not originate a packet to a multicast address 677 * whose scop field contains the reserved value 0; if such 678 * a packet is received, it must be silently dropped. 679 */ 680 IP6STAT_INC(ip6s_badscope); 681 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 682 goto bad; 683 } 684 #ifdef ALTQ 685 if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) { 686 /* packet is dropped by traffic conditioner */ 687 return; 688 } 689 #endif 690 /* 691 * The following check is not documented in specs. A malicious 692 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack 693 * and bypass security checks (act as if it was from 127.0.0.1 by using 694 * IPv6 src ::ffff:127.0.0.1). Be cautious. 695 * 696 * This check chokes if we are in an SIIT cloud. As none of BSDs 697 * support IPv4-less kernel compilation, we cannot support SIIT 698 * environment at all. So, it makes more sense for us to reject any 699 * malicious packets for non-SIIT environment, than try to do a 700 * partial support for SIIT environment. 701 */ 702 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 703 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 704 IP6STAT_INC(ip6s_badscope); 705 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 706 goto bad; 707 } 708 #if 0 709 /* 710 * Reject packets with IPv4 compatible addresses (auto tunnel). 711 * 712 * The code forbids auto tunnel relay case in RFC1933 (the check is 713 * stronger than RFC1933). We may want to re-enable it if mech-xx 714 * is revised to forbid relaying case. 715 */ 716 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) || 717 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) { 718 IP6STAT_INC(ip6s_badscope); 719 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 720 goto bad; 721 } 722 #endif 723 /* 724 * Try to forward the packet, but if we fail continue. 725 * ip6_tryforward() does inbound and outbound packet firewall 726 * processing. If firewall has decided that destination becomes 727 * our local address, it sets M_FASTFWD_OURS flag. In this 728 * case skip another inbound firewall processing and update 729 * ip6 pointer. 730 */ 731 if (V_ip6_forwarding != 0 732 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 733 && (!IPSEC_ENABLED(ipv6) || 734 IPSEC_CAPS(ipv6, m, IPSEC_CAP_OPERABLE) == 0) 735 #endif 736 ) { 737 if ((m = ip6_tryforward(m)) == NULL) 738 return; 739 if (m->m_flags & M_FASTFWD_OURS) { 740 m->m_flags &= ~M_FASTFWD_OURS; 741 ours = 1; 742 ip6 = mtod(m, struct ip6_hdr *); 743 goto hbhcheck; 744 } 745 } 746 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 747 /* 748 * Bypass packet filtering for packets previously handled by IPsec. 749 */ 750 if (IPSEC_ENABLED(ipv6) && 751 IPSEC_CAPS(ipv6, m, IPSEC_CAP_BYPASS_FILTER) != 0) 752 goto passin; 753 #endif 754 /* 755 * Run through list of hooks for input packets. 756 * 757 * NB: Beware of the destination address changing 758 * (e.g. by NAT rewriting). When this happens, 759 * tell ip6_forward to do the right thing. 760 */ 761 762 /* Jump over all PFIL processing if hooks are not active. */ 763 if (!PFIL_HOOKED(&V_inet6_pfil_hook)) 764 goto passin; 765 766 odst = ip6->ip6_dst; 767 if (pfil_run_hooks(&V_inet6_pfil_hook, &m, 768 m->m_pkthdr.rcvif, PFIL_IN, NULL)) 769 return; 770 if (m == NULL) /* consumed by filter */ 771 return; 772 ip6 = mtod(m, struct ip6_hdr *); 773 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst); 774 775 if (m->m_flags & M_FASTFWD_OURS) { 776 m->m_flags &= ~M_FASTFWD_OURS; 777 ours = 1; 778 goto hbhcheck; 779 } 780 if ((m->m_flags & M_IP6_NEXTHOP) && 781 m_tag_find(m, PACKET_TAG_IPFORWARD, NULL) != NULL) { 782 /* 783 * Directly ship the packet on. This allows forwarding 784 * packets originally destined to us to some other directly 785 * connected host. 786 */ 787 ip6_forward(m, 1); 788 return; 789 } 790 791 passin: 792 /* 793 * Disambiguate address scope zones (if there is ambiguity). 794 * We first make sure that the original source or destination address 795 * is not in our internal form for scoped addresses. Such addresses 796 * are not necessarily invalid spec-wise, but we cannot accept them due 797 * to the usage conflict. 798 * in6_setscope() then also checks and rejects the cases where src or 799 * dst are the loopback address and the receiving interface 800 * is not loopback. 801 */ 802 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) { 803 IP6STAT_INC(ip6s_badscope); /* XXX */ 804 goto bad; 805 } 806 if (in6_setscope(&ip6->ip6_src, rcvif, NULL) || 807 in6_setscope(&ip6->ip6_dst, rcvif, NULL)) { 808 IP6STAT_INC(ip6s_badscope); 809 goto bad; 810 } 811 /* 812 * Multicast check. Assume packet is for us to avoid 813 * prematurely taking locks. 814 */ 815 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 816 ours = 1; 817 in6_ifstat_inc(rcvif, ifs6_in_mcast); 818 goto hbhcheck; 819 } 820 /* 821 * Unicast check 822 * XXX: For now we keep link-local IPv6 addresses with embedded 823 * scope zone id, therefore we use zero zoneid here. 824 */ 825 ia = in6ifa_ifwithaddr(&ip6->ip6_dst, 0 /* XXX */); 826 if (ia != NULL) { 827 if (ia->ia6_flags & IN6_IFF_NOTREADY) { 828 char ip6bufs[INET6_ADDRSTRLEN]; 829 char ip6bufd[INET6_ADDRSTRLEN]; 830 /* address is not ready, so discard the packet. */ 831 nd6log((LOG_INFO, 832 "ip6_input: packet to an unready address %s->%s\n", 833 ip6_sprintf(ip6bufs, &ip6->ip6_src), 834 ip6_sprintf(ip6bufd, &ip6->ip6_dst))); 835 ifa_free(&ia->ia_ifa); 836 goto bad; 837 } 838 /* Count the packet in the ip address stats */ 839 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1); 840 counter_u64_add(ia->ia_ifa.ifa_ibytes, m->m_pkthdr.len); 841 ifa_free(&ia->ia_ifa); 842 ours = 1; 843 goto hbhcheck; 844 } 845 846 /* 847 * Now there is no reason to process the packet if it's not our own 848 * and we're not a router. 849 */ 850 if (!V_ip6_forwarding) { 851 IP6STAT_INC(ip6s_cantforward); 852 goto bad; 853 } 854 855 hbhcheck: 856 /* 857 * Process Hop-by-Hop options header if it's contained. 858 * m may be modified in ip6_hopopts_input(). 859 * If a JumboPayload option is included, plen will also be modified. 860 */ 861 plen = (u_int32_t)ntohs(ip6->ip6_plen); 862 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 863 if (ip6_input_hbh(m, &plen, &rtalert, &off, &nxt, &ours) != 0) 864 return; 865 } else 866 nxt = ip6->ip6_nxt; 867 868 /* 869 * Use mbuf flags to propagate Router Alert option to 870 * ICMPv6 layer, as hop-by-hop options have been stripped. 871 */ 872 if (rtalert != ~0) 873 m->m_flags |= M_RTALERT_MLD; 874 875 /* 876 * Check that the amount of data in the buffers 877 * is as at least much as the IPv6 header would have us expect. 878 * Trim mbufs if longer than we expect. 879 * Drop packet if shorter than we expect. 880 */ 881 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 882 IP6STAT_INC(ip6s_tooshort); 883 in6_ifstat_inc(rcvif, ifs6_in_truncated); 884 goto bad; 885 } 886 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 887 if (m->m_len == m->m_pkthdr.len) { 888 m->m_len = sizeof(struct ip6_hdr) + plen; 889 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 890 } else 891 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 892 } 893 894 /* 895 * Forward if desirable. 896 */ 897 if (V_ip6_mrouter && 898 IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 899 /* 900 * If we are acting as a multicast router, all 901 * incoming multicast packets are passed to the 902 * kernel-level multicast forwarding function. 903 * The packet is returned (relatively) intact; if 904 * ip6_mforward() returns a non-zero value, the packet 905 * must be discarded, else it may be accepted below. 906 * 907 * XXX TODO: Check hlim and multicast scope here to avoid 908 * unnecessarily calling into ip6_mforward(). 909 */ 910 if (ip6_mforward && ip6_mforward(ip6, rcvif, m)) { 911 IP6STAT_INC(ip6s_cantforward); 912 goto bad; 913 } 914 } else if (!ours) { 915 ip6_forward(m, srcrt); 916 return; 917 } 918 919 ip6 = mtod(m, struct ip6_hdr *); 920 921 /* 922 * Malicious party may be able to use IPv4 mapped addr to confuse 923 * tcp/udp stack and bypass security checks (act as if it was from 924 * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious. 925 * 926 * For SIIT end node behavior, you may want to disable the check. 927 * However, you will become vulnerable to attacks using IPv4 mapped 928 * source. 929 */ 930 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 931 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 932 IP6STAT_INC(ip6s_badscope); 933 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 934 goto bad; 935 } 936 937 /* 938 * Tell launch routine the next header 939 */ 940 IP6STAT_INC(ip6s_delivered); 941 in6_ifstat_inc(rcvif, ifs6_in_deliver); 942 nest = 0; 943 944 while (nxt != IPPROTO_DONE) { 945 if (V_ip6_hdrnestlimit && (++nest > V_ip6_hdrnestlimit)) { 946 IP6STAT_INC(ip6s_toomanyhdr); 947 goto bad; 948 } 949 950 /* 951 * protection against faulty packet - there should be 952 * more sanity checks in header chain processing. 953 */ 954 if (m->m_pkthdr.len < off) { 955 IP6STAT_INC(ip6s_tooshort); 956 in6_ifstat_inc(rcvif, ifs6_in_truncated); 957 goto bad; 958 } 959 960 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 961 if (IPSEC_ENABLED(ipv6)) { 962 if (IPSEC_INPUT(ipv6, m, off, nxt) != 0) 963 return; 964 } 965 #endif /* IPSEC */ 966 967 nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt); 968 } 969 return; 970 bad: 971 in6_ifstat_inc(rcvif, ifs6_in_discard); 972 if (m != NULL) 973 m_freem(m); 974 } 975 976 /* 977 * Hop-by-Hop options header processing. If a valid jumbo payload option is 978 * included, the real payload length will be stored in plenp. 979 * 980 * rtalertp - XXX: should be stored more smart way 981 */ 982 static int 983 ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp, 984 struct mbuf **mp, int *offp) 985 { 986 struct mbuf *m = *mp; 987 int off = *offp, hbhlen; 988 struct ip6_hbh *hbh; 989 990 /* validation of the length of the header */ 991 #ifndef PULLDOWN_TEST 992 IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1); 993 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); 994 hbhlen = (hbh->ip6h_len + 1) << 3; 995 996 IP6_EXTHDR_CHECK(m, off, hbhlen, -1); 997 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); 998 #else 999 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, 1000 sizeof(struct ip6_hdr), sizeof(struct ip6_hbh)); 1001 if (hbh == NULL) { 1002 IP6STAT_INC(ip6s_tooshort); 1003 return -1; 1004 } 1005 hbhlen = (hbh->ip6h_len + 1) << 3; 1006 IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 1007 hbhlen); 1008 if (hbh == NULL) { 1009 IP6STAT_INC(ip6s_tooshort); 1010 return -1; 1011 } 1012 #endif 1013 off += hbhlen; 1014 hbhlen -= sizeof(struct ip6_hbh); 1015 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 1016 hbhlen, rtalertp, plenp) < 0) 1017 return (-1); 1018 1019 *offp = off; 1020 *mp = m; 1021 return (0); 1022 } 1023 1024 /* 1025 * Search header for all Hop-by-hop options and process each option. 1026 * This function is separate from ip6_hopopts_input() in order to 1027 * handle a case where the sending node itself process its hop-by-hop 1028 * options header. In such a case, the function is called from ip6_output(). 1029 * 1030 * The function assumes that hbh header is located right after the IPv6 header 1031 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to 1032 * opthead + hbhlen is located in contiguous memory region. 1033 */ 1034 int 1035 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen, 1036 u_int32_t *rtalertp, u_int32_t *plenp) 1037 { 1038 struct ip6_hdr *ip6; 1039 int optlen = 0; 1040 u_int8_t *opt = opthead; 1041 u_int16_t rtalert_val; 1042 u_int32_t jumboplen; 1043 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh); 1044 1045 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 1046 switch (*opt) { 1047 case IP6OPT_PAD1: 1048 optlen = 1; 1049 break; 1050 case IP6OPT_PADN: 1051 if (hbhlen < IP6OPT_MINLEN) { 1052 IP6STAT_INC(ip6s_toosmall); 1053 goto bad; 1054 } 1055 optlen = *(opt + 1) + 2; 1056 break; 1057 case IP6OPT_ROUTER_ALERT: 1058 /* XXX may need check for alignment */ 1059 if (hbhlen < IP6OPT_RTALERT_LEN) { 1060 IP6STAT_INC(ip6s_toosmall); 1061 goto bad; 1062 } 1063 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) { 1064 /* XXX stat */ 1065 icmp6_error(m, ICMP6_PARAM_PROB, 1066 ICMP6_PARAMPROB_HEADER, 1067 erroff + opt + 1 - opthead); 1068 return (-1); 1069 } 1070 optlen = IP6OPT_RTALERT_LEN; 1071 bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2); 1072 *rtalertp = ntohs(rtalert_val); 1073 break; 1074 case IP6OPT_JUMBO: 1075 /* XXX may need check for alignment */ 1076 if (hbhlen < IP6OPT_JUMBO_LEN) { 1077 IP6STAT_INC(ip6s_toosmall); 1078 goto bad; 1079 } 1080 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) { 1081 /* XXX stat */ 1082 icmp6_error(m, ICMP6_PARAM_PROB, 1083 ICMP6_PARAMPROB_HEADER, 1084 erroff + opt + 1 - opthead); 1085 return (-1); 1086 } 1087 optlen = IP6OPT_JUMBO_LEN; 1088 1089 /* 1090 * IPv6 packets that have non 0 payload length 1091 * must not contain a jumbo payload option. 1092 */ 1093 ip6 = mtod(m, struct ip6_hdr *); 1094 if (ip6->ip6_plen) { 1095 IP6STAT_INC(ip6s_badoptions); 1096 icmp6_error(m, ICMP6_PARAM_PROB, 1097 ICMP6_PARAMPROB_HEADER, 1098 erroff + opt - opthead); 1099 return (-1); 1100 } 1101 1102 /* 1103 * We may see jumbolen in unaligned location, so 1104 * we'd need to perform bcopy(). 1105 */ 1106 bcopy(opt + 2, &jumboplen, sizeof(jumboplen)); 1107 jumboplen = (u_int32_t)htonl(jumboplen); 1108 1109 #if 1 1110 /* 1111 * if there are multiple jumbo payload options, 1112 * *plenp will be non-zero and the packet will be 1113 * rejected. 1114 * the behavior may need some debate in ipngwg - 1115 * multiple options does not make sense, however, 1116 * there's no explicit mention in specification. 1117 */ 1118 if (*plenp != 0) { 1119 IP6STAT_INC(ip6s_badoptions); 1120 icmp6_error(m, ICMP6_PARAM_PROB, 1121 ICMP6_PARAMPROB_HEADER, 1122 erroff + opt + 2 - opthead); 1123 return (-1); 1124 } 1125 #endif 1126 1127 /* 1128 * jumbo payload length must be larger than 65535. 1129 */ 1130 if (jumboplen <= IPV6_MAXPACKET) { 1131 IP6STAT_INC(ip6s_badoptions); 1132 icmp6_error(m, ICMP6_PARAM_PROB, 1133 ICMP6_PARAMPROB_HEADER, 1134 erroff + opt + 2 - opthead); 1135 return (-1); 1136 } 1137 *plenp = jumboplen; 1138 1139 break; 1140 default: /* unknown option */ 1141 if (hbhlen < IP6OPT_MINLEN) { 1142 IP6STAT_INC(ip6s_toosmall); 1143 goto bad; 1144 } 1145 optlen = ip6_unknown_opt(opt, m, 1146 erroff + opt - opthead); 1147 if (optlen == -1) 1148 return (-1); 1149 optlen += 2; 1150 break; 1151 } 1152 } 1153 1154 return (0); 1155 1156 bad: 1157 m_freem(m); 1158 return (-1); 1159 } 1160 1161 /* 1162 * Unknown option processing. 1163 * The third argument `off' is the offset from the IPv6 header to the option, 1164 * which is necessary if the IPv6 header the and option header and IPv6 header 1165 * is not contiguous in order to return an ICMPv6 error. 1166 */ 1167 int 1168 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off) 1169 { 1170 struct ip6_hdr *ip6; 1171 1172 switch (IP6OPT_TYPE(*optp)) { 1173 case IP6OPT_TYPE_SKIP: /* ignore the option */ 1174 return ((int)*(optp + 1)); 1175 case IP6OPT_TYPE_DISCARD: /* silently discard */ 1176 m_freem(m); 1177 return (-1); 1178 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 1179 IP6STAT_INC(ip6s_badoptions); 1180 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 1181 return (-1); 1182 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 1183 IP6STAT_INC(ip6s_badoptions); 1184 ip6 = mtod(m, struct ip6_hdr *); 1185 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 1186 (m->m_flags & (M_BCAST|M_MCAST))) 1187 m_freem(m); 1188 else 1189 icmp6_error(m, ICMP6_PARAM_PROB, 1190 ICMP6_PARAMPROB_OPTION, off); 1191 return (-1); 1192 } 1193 1194 m_freem(m); /* XXX: NOTREACHED */ 1195 return (-1); 1196 } 1197 1198 /* 1199 * Create the "control" list for this pcb. 1200 * These functions will not modify mbuf chain at all. 1201 * 1202 * With KAME mbuf chain restriction: 1203 * The routine will be called from upper layer handlers like tcp6_input(). 1204 * Thus the routine assumes that the caller (tcp6_input) have already 1205 * called IP6_EXTHDR_CHECK() and all the extension headers are located in the 1206 * very first mbuf on the mbuf chain. 1207 * 1208 * ip6_savecontrol_v4 will handle those options that are possible to be 1209 * set on a v4-mapped socket. 1210 * ip6_savecontrol will directly call ip6_savecontrol_v4 to handle those 1211 * options and handle the v6-only ones itself. 1212 */ 1213 struct mbuf ** 1214 ip6_savecontrol_v4(struct inpcb *inp, struct mbuf *m, struct mbuf **mp, 1215 int *v4only) 1216 { 1217 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1218 1219 #ifdef SO_TIMESTAMP 1220 if ((inp->inp_socket->so_options & SO_TIMESTAMP) != 0) { 1221 union { 1222 struct timeval tv; 1223 struct bintime bt; 1224 struct timespec ts; 1225 } t; 1226 struct bintime boottimebin, bt1; 1227 struct timespec ts1; 1228 bool stamped; 1229 1230 stamped = false; 1231 switch (inp->inp_socket->so_ts_clock) { 1232 case SO_TS_REALTIME_MICRO: 1233 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1234 M_TSTMP)) { 1235 mbuf_tstmp2timespec(m, &ts1); 1236 timespec2bintime(&ts1, &bt1); 1237 getboottimebin(&boottimebin); 1238 bintime_add(&bt1, &boottimebin); 1239 bintime2timeval(&bt1, &t.tv); 1240 } else { 1241 microtime(&t.tv); 1242 } 1243 *mp = sbcreatecontrol((caddr_t) &t.tv, sizeof(t.tv), 1244 SCM_TIMESTAMP, SOL_SOCKET); 1245 if (*mp != NULL) { 1246 mp = &(*mp)->m_next; 1247 stamped = true; 1248 } 1249 break; 1250 1251 case SO_TS_BINTIME: 1252 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1253 M_TSTMP)) { 1254 mbuf_tstmp2timespec(m, &ts1); 1255 timespec2bintime(&ts1, &t.bt); 1256 getboottimebin(&boottimebin); 1257 bintime_add(&t.bt, &boottimebin); 1258 } else { 1259 bintime(&t.bt); 1260 } 1261 *mp = sbcreatecontrol((caddr_t)&t.bt, sizeof(t.bt), 1262 SCM_BINTIME, SOL_SOCKET); 1263 if (*mp != NULL) { 1264 mp = &(*mp)->m_next; 1265 stamped = true; 1266 } 1267 break; 1268 1269 case SO_TS_REALTIME: 1270 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1271 M_TSTMP)) { 1272 mbuf_tstmp2timespec(m, &t.ts); 1273 getboottimebin(&boottimebin); 1274 bintime2timespec(&boottimebin, &ts1); 1275 timespecadd(&t.ts, &ts1); 1276 } else { 1277 nanotime(&t.ts); 1278 } 1279 *mp = sbcreatecontrol((caddr_t)&t.ts, sizeof(t.ts), 1280 SCM_REALTIME, SOL_SOCKET); 1281 if (*mp != NULL) { 1282 mp = &(*mp)->m_next; 1283 stamped = true; 1284 } 1285 break; 1286 1287 case SO_TS_MONOTONIC: 1288 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1289 M_TSTMP)) 1290 mbuf_tstmp2timespec(m, &t.ts); 1291 else 1292 nanouptime(&t.ts); 1293 *mp = sbcreatecontrol((caddr_t)&t.ts, sizeof(t.ts), 1294 SCM_MONOTONIC, SOL_SOCKET); 1295 if (*mp != NULL) { 1296 mp = &(*mp)->m_next; 1297 stamped = true; 1298 } 1299 break; 1300 1301 default: 1302 panic("unknown (corrupted) so_ts_clock"); 1303 } 1304 if (stamped && (m->m_flags & (M_PKTHDR | M_TSTMP)) == 1305 (M_PKTHDR | M_TSTMP)) { 1306 struct sock_timestamp_info sti; 1307 1308 bzero(&sti, sizeof(sti)); 1309 sti.st_info_flags = ST_INFO_HW; 1310 if ((m->m_flags & M_TSTMP_HPREC) != 0) 1311 sti.st_info_flags |= ST_INFO_HW_HPREC; 1312 *mp = sbcreatecontrol((caddr_t)&sti, sizeof(sti), 1313 SCM_TIME_INFO, SOL_SOCKET); 1314 if (*mp != NULL) 1315 mp = &(*mp)->m_next; 1316 } 1317 } 1318 #endif 1319 1320 #define IS2292(inp, x, y) (((inp)->inp_flags & IN6P_RFC2292) ? (x) : (y)) 1321 /* RFC 2292 sec. 5 */ 1322 if ((inp->inp_flags & IN6P_PKTINFO) != 0) { 1323 struct in6_pktinfo pi6; 1324 1325 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1326 #ifdef INET 1327 struct ip *ip; 1328 1329 ip = mtod(m, struct ip *); 1330 pi6.ipi6_addr.s6_addr32[0] = 0; 1331 pi6.ipi6_addr.s6_addr32[1] = 0; 1332 pi6.ipi6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP; 1333 pi6.ipi6_addr.s6_addr32[3] = ip->ip_dst.s_addr; 1334 #else 1335 /* We won't hit this code */ 1336 bzero(&pi6.ipi6_addr, sizeof(struct in6_addr)); 1337 #endif 1338 } else { 1339 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr)); 1340 in6_clearscope(&pi6.ipi6_addr); /* XXX */ 1341 } 1342 pi6.ipi6_ifindex = 1343 (m && m->m_pkthdr.rcvif) ? m->m_pkthdr.rcvif->if_index : 0; 1344 1345 *mp = sbcreatecontrol((caddr_t) &pi6, 1346 sizeof(struct in6_pktinfo), 1347 IS2292(inp, IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6); 1348 if (*mp) 1349 mp = &(*mp)->m_next; 1350 } 1351 1352 if ((inp->inp_flags & IN6P_HOPLIMIT) != 0) { 1353 int hlim; 1354 1355 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1356 #ifdef INET 1357 struct ip *ip; 1358 1359 ip = mtod(m, struct ip *); 1360 hlim = ip->ip_ttl; 1361 #else 1362 /* We won't hit this code */ 1363 hlim = 0; 1364 #endif 1365 } else { 1366 hlim = ip6->ip6_hlim & 0xff; 1367 } 1368 *mp = sbcreatecontrol((caddr_t) &hlim, sizeof(int), 1369 IS2292(inp, IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), 1370 IPPROTO_IPV6); 1371 if (*mp) 1372 mp = &(*mp)->m_next; 1373 } 1374 1375 if ((inp->inp_flags & IN6P_TCLASS) != 0) { 1376 int tclass; 1377 1378 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1379 #ifdef INET 1380 struct ip *ip; 1381 1382 ip = mtod(m, struct ip *); 1383 tclass = ip->ip_tos; 1384 #else 1385 /* We won't hit this code */ 1386 tclass = 0; 1387 #endif 1388 } else { 1389 u_int32_t flowinfo; 1390 1391 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK); 1392 flowinfo >>= 20; 1393 tclass = flowinfo & 0xff; 1394 } 1395 *mp = sbcreatecontrol((caddr_t) &tclass, sizeof(int), 1396 IPV6_TCLASS, IPPROTO_IPV6); 1397 if (*mp) 1398 mp = &(*mp)->m_next; 1399 } 1400 1401 if (v4only != NULL) { 1402 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1403 *v4only = 1; 1404 } else { 1405 *v4only = 0; 1406 } 1407 } 1408 1409 return (mp); 1410 } 1411 1412 void 1413 ip6_savecontrol(struct inpcb *in6p, struct mbuf *m, struct mbuf **mp) 1414 { 1415 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1416 int v4only = 0; 1417 1418 mp = ip6_savecontrol_v4(in6p, m, mp, &v4only); 1419 if (v4only) 1420 return; 1421 1422 /* 1423 * IPV6_HOPOPTS socket option. Recall that we required super-user 1424 * privilege for the option (see ip6_ctloutput), but it might be too 1425 * strict, since there might be some hop-by-hop options which can be 1426 * returned to normal user. 1427 * See also RFC 2292 section 6 (or RFC 3542 section 8). 1428 */ 1429 if ((in6p->inp_flags & IN6P_HOPOPTS) != 0) { 1430 /* 1431 * Check if a hop-by-hop options header is contatined in the 1432 * received packet, and if so, store the options as ancillary 1433 * data. Note that a hop-by-hop options header must be 1434 * just after the IPv6 header, which is assured through the 1435 * IPv6 input processing. 1436 */ 1437 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 1438 struct ip6_hbh *hbh; 1439 int hbhlen = 0; 1440 #ifdef PULLDOWN_TEST 1441 struct mbuf *ext; 1442 #endif 1443 1444 #ifndef PULLDOWN_TEST 1445 hbh = (struct ip6_hbh *)(ip6 + 1); 1446 hbhlen = (hbh->ip6h_len + 1) << 3; 1447 #else 1448 ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr), 1449 ip6->ip6_nxt); 1450 if (ext == NULL) { 1451 IP6STAT_INC(ip6s_tooshort); 1452 return; 1453 } 1454 hbh = mtod(ext, struct ip6_hbh *); 1455 hbhlen = (hbh->ip6h_len + 1) << 3; 1456 if (hbhlen != ext->m_len) { 1457 m_freem(ext); 1458 IP6STAT_INC(ip6s_tooshort); 1459 return; 1460 } 1461 #endif 1462 1463 /* 1464 * XXX: We copy the whole header even if a 1465 * jumbo payload option is included, the option which 1466 * is to be removed before returning according to 1467 * RFC2292. 1468 * Note: this constraint is removed in RFC3542 1469 */ 1470 *mp = sbcreatecontrol((caddr_t)hbh, hbhlen, 1471 IS2292(in6p, IPV6_2292HOPOPTS, IPV6_HOPOPTS), 1472 IPPROTO_IPV6); 1473 if (*mp) 1474 mp = &(*mp)->m_next; 1475 #ifdef PULLDOWN_TEST 1476 m_freem(ext); 1477 #endif 1478 } 1479 } 1480 1481 if ((in6p->inp_flags & (IN6P_RTHDR | IN6P_DSTOPTS)) != 0) { 1482 int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr); 1483 1484 /* 1485 * Search for destination options headers or routing 1486 * header(s) through the header chain, and stores each 1487 * header as ancillary data. 1488 * Note that the order of the headers remains in 1489 * the chain of ancillary data. 1490 */ 1491 while (1) { /* is explicit loop prevention necessary? */ 1492 struct ip6_ext *ip6e = NULL; 1493 int elen; 1494 #ifdef PULLDOWN_TEST 1495 struct mbuf *ext = NULL; 1496 #endif 1497 1498 /* 1499 * if it is not an extension header, don't try to 1500 * pull it from the chain. 1501 */ 1502 switch (nxt) { 1503 case IPPROTO_DSTOPTS: 1504 case IPPROTO_ROUTING: 1505 case IPPROTO_HOPOPTS: 1506 case IPPROTO_AH: /* is it possible? */ 1507 break; 1508 default: 1509 goto loopend; 1510 } 1511 1512 #ifndef PULLDOWN_TEST 1513 if (off + sizeof(*ip6e) > m->m_len) 1514 goto loopend; 1515 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off); 1516 if (nxt == IPPROTO_AH) 1517 elen = (ip6e->ip6e_len + 2) << 2; 1518 else 1519 elen = (ip6e->ip6e_len + 1) << 3; 1520 if (off + elen > m->m_len) 1521 goto loopend; 1522 #else 1523 ext = ip6_pullexthdr(m, off, nxt); 1524 if (ext == NULL) { 1525 IP6STAT_INC(ip6s_tooshort); 1526 return; 1527 } 1528 ip6e = mtod(ext, struct ip6_ext *); 1529 if (nxt == IPPROTO_AH) 1530 elen = (ip6e->ip6e_len + 2) << 2; 1531 else 1532 elen = (ip6e->ip6e_len + 1) << 3; 1533 if (elen != ext->m_len) { 1534 m_freem(ext); 1535 IP6STAT_INC(ip6s_tooshort); 1536 return; 1537 } 1538 #endif 1539 1540 switch (nxt) { 1541 case IPPROTO_DSTOPTS: 1542 if (!(in6p->inp_flags & IN6P_DSTOPTS)) 1543 break; 1544 1545 *mp = sbcreatecontrol((caddr_t)ip6e, elen, 1546 IS2292(in6p, 1547 IPV6_2292DSTOPTS, IPV6_DSTOPTS), 1548 IPPROTO_IPV6); 1549 if (*mp) 1550 mp = &(*mp)->m_next; 1551 break; 1552 case IPPROTO_ROUTING: 1553 if (!(in6p->inp_flags & IN6P_RTHDR)) 1554 break; 1555 1556 *mp = sbcreatecontrol((caddr_t)ip6e, elen, 1557 IS2292(in6p, IPV6_2292RTHDR, IPV6_RTHDR), 1558 IPPROTO_IPV6); 1559 if (*mp) 1560 mp = &(*mp)->m_next; 1561 break; 1562 case IPPROTO_HOPOPTS: 1563 case IPPROTO_AH: /* is it possible? */ 1564 break; 1565 1566 default: 1567 /* 1568 * other cases have been filtered in the above. 1569 * none will visit this case. here we supply 1570 * the code just in case (nxt overwritten or 1571 * other cases). 1572 */ 1573 #ifdef PULLDOWN_TEST 1574 m_freem(ext); 1575 #endif 1576 goto loopend; 1577 1578 } 1579 1580 /* proceed with the next header. */ 1581 off += elen; 1582 nxt = ip6e->ip6e_nxt; 1583 ip6e = NULL; 1584 #ifdef PULLDOWN_TEST 1585 m_freem(ext); 1586 ext = NULL; 1587 #endif 1588 } 1589 loopend: 1590 ; 1591 } 1592 1593 if (in6p->inp_flags2 & INP_RECVFLOWID) { 1594 uint32_t flowid, flow_type; 1595 1596 flowid = m->m_pkthdr.flowid; 1597 flow_type = M_HASHTYPE_GET(m); 1598 1599 /* 1600 * XXX should handle the failure of one or the 1601 * other - don't populate both? 1602 */ 1603 *mp = sbcreatecontrol((caddr_t) &flowid, 1604 sizeof(uint32_t), IPV6_FLOWID, IPPROTO_IPV6); 1605 if (*mp) 1606 mp = &(*mp)->m_next; 1607 *mp = sbcreatecontrol((caddr_t) &flow_type, 1608 sizeof(uint32_t), IPV6_FLOWTYPE, IPPROTO_IPV6); 1609 if (*mp) 1610 mp = &(*mp)->m_next; 1611 } 1612 1613 #ifdef RSS 1614 if (in6p->inp_flags2 & INP_RECVRSSBUCKETID) { 1615 uint32_t flowid, flow_type; 1616 uint32_t rss_bucketid; 1617 1618 flowid = m->m_pkthdr.flowid; 1619 flow_type = M_HASHTYPE_GET(m); 1620 1621 if (rss_hash2bucket(flowid, flow_type, &rss_bucketid) == 0) { 1622 *mp = sbcreatecontrol((caddr_t) &rss_bucketid, 1623 sizeof(uint32_t), IPV6_RSSBUCKETID, IPPROTO_IPV6); 1624 if (*mp) 1625 mp = &(*mp)->m_next; 1626 } 1627 } 1628 #endif 1629 1630 } 1631 #undef IS2292 1632 1633 void 1634 ip6_notify_pmtu(struct inpcb *inp, struct sockaddr_in6 *dst, u_int32_t mtu) 1635 { 1636 struct socket *so; 1637 struct mbuf *m_mtu; 1638 struct ip6_mtuinfo mtuctl; 1639 1640 KASSERT(inp != NULL, ("%s: inp == NULL", __func__)); 1641 /* 1642 * Notify the error by sending IPV6_PATHMTU ancillary data if 1643 * application wanted to know the MTU value. 1644 * NOTE: we notify disconnected sockets, because some udp 1645 * applications keep sending sockets disconnected. 1646 * NOTE: our implementation doesn't notify connected sockets that has 1647 * foreign address that is different than given destination addresses 1648 * (this is permitted by RFC 3542). 1649 */ 1650 if ((inp->inp_flags & IN6P_MTU) == 0 || ( 1651 !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 1652 !IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &dst->sin6_addr))) 1653 return; 1654 1655 mtuctl.ip6m_mtu = mtu; 1656 mtuctl.ip6m_addr = *dst; 1657 if (sa6_recoverscope(&mtuctl.ip6m_addr)) 1658 return; 1659 1660 if ((m_mtu = sbcreatecontrol((caddr_t)&mtuctl, sizeof(mtuctl), 1661 IPV6_PATHMTU, IPPROTO_IPV6)) == NULL) 1662 return; 1663 1664 so = inp->inp_socket; 1665 if (sbappendaddr(&so->so_rcv, (struct sockaddr *)dst, NULL, m_mtu) 1666 == 0) { 1667 m_freem(m_mtu); 1668 /* XXX: should count statistics */ 1669 } else 1670 sorwakeup(so); 1671 } 1672 1673 #ifdef PULLDOWN_TEST 1674 /* 1675 * pull single extension header from mbuf chain. returns single mbuf that 1676 * contains the result, or NULL on error. 1677 */ 1678 static struct mbuf * 1679 ip6_pullexthdr(struct mbuf *m, size_t off, int nxt) 1680 { 1681 struct ip6_ext ip6e; 1682 size_t elen; 1683 struct mbuf *n; 1684 1685 #ifdef DIAGNOSTIC 1686 switch (nxt) { 1687 case IPPROTO_DSTOPTS: 1688 case IPPROTO_ROUTING: 1689 case IPPROTO_HOPOPTS: 1690 case IPPROTO_AH: /* is it possible? */ 1691 break; 1692 default: 1693 printf("ip6_pullexthdr: invalid nxt=%d\n", nxt); 1694 } 1695 #endif 1696 1697 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1698 if (nxt == IPPROTO_AH) 1699 elen = (ip6e.ip6e_len + 2) << 2; 1700 else 1701 elen = (ip6e.ip6e_len + 1) << 3; 1702 1703 if (elen > MLEN) 1704 n = m_getcl(M_NOWAIT, MT_DATA, 0); 1705 else 1706 n = m_get(M_NOWAIT, MT_DATA); 1707 if (n == NULL) 1708 return NULL; 1709 1710 m_copydata(m, off, elen, mtod(n, caddr_t)); 1711 n->m_len = elen; 1712 return n; 1713 } 1714 #endif 1715 1716 /* 1717 * Get pointer to the previous header followed by the header 1718 * currently processed. 1719 * XXX: This function supposes that 1720 * M includes all headers, 1721 * the next header field and the header length field of each header 1722 * are valid, and 1723 * the sum of each header length equals to OFF. 1724 * Because of these assumptions, this function must be called very 1725 * carefully. Moreover, it will not be used in the near future when 1726 * we develop `neater' mechanism to process extension headers. 1727 */ 1728 char * 1729 ip6_get_prevhdr(const struct mbuf *m, int off) 1730 { 1731 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1732 1733 if (off == sizeof(struct ip6_hdr)) 1734 return (&ip6->ip6_nxt); 1735 else { 1736 int len, nxt; 1737 struct ip6_ext *ip6e = NULL; 1738 1739 nxt = ip6->ip6_nxt; 1740 len = sizeof(struct ip6_hdr); 1741 while (len < off) { 1742 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len); 1743 1744 switch (nxt) { 1745 case IPPROTO_FRAGMENT: 1746 len += sizeof(struct ip6_frag); 1747 break; 1748 case IPPROTO_AH: 1749 len += (ip6e->ip6e_len + 2) << 2; 1750 break; 1751 default: 1752 len += (ip6e->ip6e_len + 1) << 3; 1753 break; 1754 } 1755 nxt = ip6e->ip6e_nxt; 1756 } 1757 if (ip6e) 1758 return (&ip6e->ip6e_nxt); 1759 else 1760 return NULL; 1761 } 1762 } 1763 1764 /* 1765 * get next header offset. m will be retained. 1766 */ 1767 int 1768 ip6_nexthdr(const struct mbuf *m, int off, int proto, int *nxtp) 1769 { 1770 struct ip6_hdr ip6; 1771 struct ip6_ext ip6e; 1772 struct ip6_frag fh; 1773 1774 /* just in case */ 1775 if (m == NULL) 1776 panic("ip6_nexthdr: m == NULL"); 1777 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off) 1778 return -1; 1779 1780 switch (proto) { 1781 case IPPROTO_IPV6: 1782 if (m->m_pkthdr.len < off + sizeof(ip6)) 1783 return -1; 1784 m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6); 1785 if (nxtp) 1786 *nxtp = ip6.ip6_nxt; 1787 off += sizeof(ip6); 1788 return off; 1789 1790 case IPPROTO_FRAGMENT: 1791 /* 1792 * terminate parsing if it is not the first fragment, 1793 * it does not make sense to parse through it. 1794 */ 1795 if (m->m_pkthdr.len < off + sizeof(fh)) 1796 return -1; 1797 m_copydata(m, off, sizeof(fh), (caddr_t)&fh); 1798 /* IP6F_OFF_MASK = 0xfff8(BigEndian), 0xf8ff(LittleEndian) */ 1799 if (fh.ip6f_offlg & IP6F_OFF_MASK) 1800 return -1; 1801 if (nxtp) 1802 *nxtp = fh.ip6f_nxt; 1803 off += sizeof(struct ip6_frag); 1804 return off; 1805 1806 case IPPROTO_AH: 1807 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1808 return -1; 1809 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1810 if (nxtp) 1811 *nxtp = ip6e.ip6e_nxt; 1812 off += (ip6e.ip6e_len + 2) << 2; 1813 return off; 1814 1815 case IPPROTO_HOPOPTS: 1816 case IPPROTO_ROUTING: 1817 case IPPROTO_DSTOPTS: 1818 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1819 return -1; 1820 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1821 if (nxtp) 1822 *nxtp = ip6e.ip6e_nxt; 1823 off += (ip6e.ip6e_len + 1) << 3; 1824 return off; 1825 1826 case IPPROTO_NONE: 1827 case IPPROTO_ESP: 1828 case IPPROTO_IPCOMP: 1829 /* give up */ 1830 return -1; 1831 1832 default: 1833 return -1; 1834 } 1835 1836 /* NOTREACHED */ 1837 } 1838 1839 /* 1840 * get offset for the last header in the chain. m will be kept untainted. 1841 */ 1842 int 1843 ip6_lasthdr(const struct mbuf *m, int off, int proto, int *nxtp) 1844 { 1845 int newoff; 1846 int nxt; 1847 1848 if (!nxtp) { 1849 nxt = -1; 1850 nxtp = &nxt; 1851 } 1852 while (1) { 1853 newoff = ip6_nexthdr(m, off, proto, nxtp); 1854 if (newoff < 0) 1855 return off; 1856 else if (newoff < off) 1857 return -1; /* invalid */ 1858 else if (newoff == off) 1859 return newoff; 1860 1861 off = newoff; 1862 proto = *nxtp; 1863 } 1864 } 1865 1866 /* 1867 * System control for IP6 1868 */ 1869 1870 u_char inet6ctlerrmap[PRC_NCMDS] = { 1871 0, 0, 0, 0, 1872 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 1873 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 1874 EMSGSIZE, EHOSTUNREACH, 0, 0, 1875 0, 0, EHOSTUNREACH, 0, 1876 ENOPROTOOPT, ECONNREFUSED 1877 }; 1878