Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/netinet6/ip6_input.c
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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 #include "opt_sctp.h" 74 75 #include <sys/param.h> 76 #include <sys/systm.h> 77 #include <sys/hhook.h> 78 #include <sys/malloc.h> 79 #include <sys/mbuf.h> 80 #include <sys/proc.h> 81 #include <sys/domain.h> 82 #include <sys/protosw.h> 83 #include <sys/sdt.h> 84 #include <sys/socket.h> 85 #include <sys/socketvar.h> 86 #include <sys/errno.h> 87 #include <sys/time.h> 88 #include <sys/kernel.h> 89 #include <sys/lock.h> 90 #include <sys/rmlock.h> 91 #include <sys/syslog.h> 92 #include <sys/sysctl.h> 93 #include <sys/eventhandler.h> 94 95 #include <net/if.h> 96 #include <net/if_var.h> 97 #include <net/if_types.h> 98 #include <net/if_dl.h> 99 #include <net/route.h> 100 #include <net/netisr.h> 101 #include <net/rss_config.h> 102 #include <net/pfil.h> 103 #include <net/vnet.h> 104 105 #include <netinet/in.h> 106 #include <netinet/in_kdtrace.h> 107 #include <netinet/ip_var.h> 108 #include <netinet/in_systm.h> 109 #include <net/if_llatbl.h> 110 #ifdef INET 111 #include <netinet/ip.h> 112 #include <netinet/ip_icmp.h> 113 #endif /* INET */ 114 #include <netinet/ip6.h> 115 #include <netinet6/in6_var.h> 116 #include <netinet6/ip6_var.h> 117 #include <netinet/ip_encap.h> 118 #include <netinet/in_pcb.h> 119 #include <netinet/icmp6.h> 120 #include <netinet6/scope6_var.h> 121 #include <netinet6/in6_ifattach.h> 122 #include <netinet6/mld6_var.h> 123 #include <netinet6/nd6.h> 124 #include <netinet6/in6_rss.h> 125 #ifdef SCTP 126 #include <netinet/sctp_pcb.h> 127 #include <netinet6/sctp6_var.h> 128 #endif 129 130 #include <netipsec/ipsec_support.h> 131 132 ip6proto_input_t *ip6_protox[IPPROTO_MAX] = { 133 [0 ... IPPROTO_MAX - 1] = rip6_input }; 134 ip6proto_ctlinput_t *ip6_ctlprotox[IPPROTO_MAX] = { 135 [0 ... IPPROTO_MAX - 1] = rip6_ctlinput }; 136 137 VNET_DEFINE(struct in6_ifaddrhead, in6_ifaddrhead); 138 VNET_DEFINE(struct in6_ifaddrlisthead *, in6_ifaddrhashtbl); 139 VNET_DEFINE(u_long, in6_ifaddrhmask); 140 141 static struct netisr_handler ip6_nh = { 142 .nh_name = "ip6", 143 .nh_handler = ip6_input, 144 .nh_proto = NETISR_IPV6, 145 #ifdef RSS 146 .nh_m2cpuid = rss_soft_m2cpuid_v6, 147 .nh_policy = NETISR_POLICY_CPU, 148 .nh_dispatch = NETISR_DISPATCH_HYBRID, 149 #else 150 .nh_policy = NETISR_POLICY_FLOW, 151 #endif 152 }; 153 154 static int 155 sysctl_netinet6_intr_queue_maxlen(SYSCTL_HANDLER_ARGS) 156 { 157 int error, qlimit; 158 159 netisr_getqlimit(&ip6_nh, &qlimit); 160 error = sysctl_handle_int(oidp, &qlimit, 0, req); 161 if (error || !req->newptr) 162 return (error); 163 if (qlimit < 1) 164 return (EINVAL); 165 return (netisr_setqlimit(&ip6_nh, qlimit)); 166 } 167 SYSCTL_DECL(_net_inet6_ip6); 168 SYSCTL_PROC(_net_inet6_ip6, IPV6CTL_INTRQMAXLEN, intr_queue_maxlen, 169 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 170 0, 0, sysctl_netinet6_intr_queue_maxlen, "I", 171 "Maximum size of the IPv6 input queue"); 172 173 VNET_DEFINE_STATIC(bool, ip6_sav) = true; 174 #define V_ip6_sav VNET(ip6_sav) 175 SYSCTL_BOOL(_net_inet6_ip6, OID_AUTO, source_address_validation, 176 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_sav), true, 177 "Drop incoming packets with source address that is a local address"); 178 179 #ifdef RSS 180 static struct netisr_handler ip6_direct_nh = { 181 .nh_name = "ip6_direct", 182 .nh_handler = ip6_direct_input, 183 .nh_proto = NETISR_IPV6_DIRECT, 184 .nh_m2cpuid = rss_soft_m2cpuid_v6, 185 .nh_policy = NETISR_POLICY_CPU, 186 .nh_dispatch = NETISR_DISPATCH_HYBRID, 187 }; 188 189 static int 190 sysctl_netinet6_intr_direct_queue_maxlen(SYSCTL_HANDLER_ARGS) 191 { 192 int error, qlimit; 193 194 netisr_getqlimit(&ip6_direct_nh, &qlimit); 195 error = sysctl_handle_int(oidp, &qlimit, 0, req); 196 if (error || !req->newptr) 197 return (error); 198 if (qlimit < 1) 199 return (EINVAL); 200 return (netisr_setqlimit(&ip6_direct_nh, qlimit)); 201 } 202 SYSCTL_PROC(_net_inet6_ip6, IPV6CTL_INTRDQMAXLEN, intr_direct_queue_maxlen, 203 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 204 0, 0, sysctl_netinet6_intr_direct_queue_maxlen, "I", 205 "Maximum size of the IPv6 direct input queue"); 206 207 #endif 208 209 VNET_DEFINE(pfil_head_t, inet6_pfil_head); 210 211 VNET_PCPUSTAT_DEFINE(struct ip6stat, ip6stat); 212 VNET_PCPUSTAT_SYSINIT(ip6stat); 213 #ifdef VIMAGE 214 VNET_PCPUSTAT_SYSUNINIT(ip6stat); 215 #endif /* VIMAGE */ 216 217 struct rmlock in6_ifaddr_lock; 218 RM_SYSINIT(in6_ifaddr_lock, &in6_ifaddr_lock, "in6_ifaddr_lock"); 219 220 static int ip6_hopopts_input(u_int32_t *, u_int32_t *, struct mbuf **, int *); 221 222 /* 223 * IP6 initialization: fill in IP6 protocol switch table. 224 * All protocols not implemented in kernel go to raw IP6 protocol handler. 225 */ 226 static void 227 ip6_vnet_init(void *arg __unused) 228 { 229 struct pfil_head_args args; 230 231 TUNABLE_INT_FETCH("net.inet6.ip6.auto_linklocal", 232 &V_ip6_auto_linklocal); 233 TUNABLE_INT_FETCH("net.inet6.ip6.accept_rtadv", &V_ip6_accept_rtadv); 234 TUNABLE_INT_FETCH("net.inet6.ip6.no_radr", &V_ip6_no_radr); 235 236 CK_STAILQ_INIT(&V_in6_ifaddrhead); 237 V_in6_ifaddrhashtbl = hashinit(IN6ADDR_NHASH, M_IFADDR, 238 &V_in6_ifaddrhmask); 239 240 /* Initialize packet filter hooks. */ 241 args.pa_version = PFIL_VERSION; 242 args.pa_flags = PFIL_IN | PFIL_OUT; 243 args.pa_type = PFIL_TYPE_IP6; 244 args.pa_headname = PFIL_INET6_NAME; 245 V_inet6_pfil_head = pfil_head_register(&args); 246 247 if (hhook_head_register(HHOOK_TYPE_IPSEC_IN, AF_INET6, 248 &V_ipsec_hhh_in[HHOOK_IPSEC_INET6], 249 HHOOK_WAITOK | HHOOK_HEADISINVNET) != 0) 250 printf("%s: WARNING: unable to register input helper hook\n", 251 __func__); 252 if (hhook_head_register(HHOOK_TYPE_IPSEC_OUT, AF_INET6, 253 &V_ipsec_hhh_out[HHOOK_IPSEC_INET6], 254 HHOOK_WAITOK | HHOOK_HEADISINVNET) != 0) 255 printf("%s: WARNING: unable to register output helper hook\n", 256 __func__); 257 258 scope6_init(); 259 addrsel_policy_init(); 260 nd6_init(); 261 frag6_init(); 262 263 V_ip6_desync_factor = arc4random() % MAX_TEMP_DESYNC_FACTOR; 264 265 /* Skip global initialization stuff for non-default instances. */ 266 #ifdef VIMAGE 267 netisr_register_vnet(&ip6_nh); 268 #ifdef RSS 269 netisr_register_vnet(&ip6_direct_nh); 270 #endif 271 #endif 272 } 273 VNET_SYSINIT(ip6_vnet_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH, 274 ip6_vnet_init, NULL); 275 276 static void 277 ip6_init(void *arg __unused) 278 { 279 280 /* 281 * Register statically those protocols that are unlikely to ever go 282 * dynamic. 283 */ 284 IP6PROTO_REGISTER(IPPROTO_ICMPV6, icmp6_input, rip6_ctlinput); 285 IP6PROTO_REGISTER(IPPROTO_DSTOPTS, dest6_input, NULL); 286 IP6PROTO_REGISTER(IPPROTO_ROUTING, route6_input, NULL); 287 IP6PROTO_REGISTER(IPPROTO_FRAGMENT, frag6_input, NULL); 288 IP6PROTO_REGISTER(IPPROTO_IPV4, encap6_input, NULL); 289 IP6PROTO_REGISTER(IPPROTO_IPV6, encap6_input, NULL); 290 IP6PROTO_REGISTER(IPPROTO_ETHERIP, encap6_input, NULL); 291 IP6PROTO_REGISTER(IPPROTO_GRE, encap6_input, NULL); 292 IP6PROTO_REGISTER(IPPROTO_PIM, encap6_input, NULL); 293 #ifdef SCTP /* XXX: has a loadable & static version */ 294 IP6PROTO_REGISTER(IPPROTO_SCTP, sctp6_input, sctp6_ctlinput); 295 #endif 296 297 EVENTHANDLER_REGISTER(vm_lowmem, frag6_drain, NULL, LOWMEM_PRI_DEFAULT); 298 EVENTHANDLER_REGISTER(mbuf_lowmem, frag6_drain, NULL, 299 LOWMEM_PRI_DEFAULT); 300 301 netisr_register(&ip6_nh); 302 #ifdef RSS 303 netisr_register(&ip6_direct_nh); 304 #endif 305 } 306 SYSINIT(ip6_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, ip6_init, NULL); 307 308 int 309 ip6proto_register(uint8_t proto, ip6proto_input_t input, 310 ip6proto_ctlinput_t ctl) 311 { 312 313 MPASS(proto > 0); 314 315 if (ip6_protox[proto] == rip6_input) { 316 ip6_protox[proto] = input; 317 ip6_ctlprotox[proto] = ctl; 318 return (0); 319 } else 320 return (EEXIST); 321 } 322 323 int 324 ip6proto_unregister(uint8_t proto) 325 { 326 327 MPASS(proto > 0); 328 329 if (ip6_protox[proto] != rip6_input) { 330 ip6_protox[proto] = rip6_input; 331 ip6_ctlprotox[proto] = rip6_ctlinput; 332 return (0); 333 } else 334 return (ENOENT); 335 } 336 337 #ifdef VIMAGE 338 static void 339 ip6_destroy(void *unused __unused) 340 { 341 struct ifaddr *ifa, *nifa; 342 struct ifnet *ifp; 343 int error; 344 345 #ifdef RSS 346 netisr_unregister_vnet(&ip6_direct_nh); 347 #endif 348 netisr_unregister_vnet(&ip6_nh); 349 350 pfil_head_unregister(V_inet6_pfil_head); 351 error = hhook_head_deregister(V_ipsec_hhh_in[HHOOK_IPSEC_INET6]); 352 if (error != 0) { 353 printf("%s: WARNING: unable to deregister input helper hook " 354 "type HHOOK_TYPE_IPSEC_IN, id HHOOK_IPSEC_INET6: " 355 "error %d returned\n", __func__, error); 356 } 357 error = hhook_head_deregister(V_ipsec_hhh_out[HHOOK_IPSEC_INET6]); 358 if (error != 0) { 359 printf("%s: WARNING: unable to deregister output helper hook " 360 "type HHOOK_TYPE_IPSEC_OUT, id HHOOK_IPSEC_INET6: " 361 "error %d returned\n", __func__, error); 362 } 363 364 /* Cleanup addresses. */ 365 IFNET_RLOCK(); 366 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 367 /* Cannot lock here - lock recursion. */ 368 /* IF_ADDR_LOCK(ifp); */ 369 CK_STAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, nifa) { 370 if (ifa->ifa_addr->sa_family != AF_INET6) 371 continue; 372 in6_purgeaddr(ifa); 373 } 374 /* IF_ADDR_UNLOCK(ifp); */ 375 in6_ifdetach_destroy(ifp); 376 mld_domifdetach(ifp); 377 } 378 IFNET_RUNLOCK(); 379 380 /* Make sure any routes are gone as well. */ 381 rib_flush_routes_family(AF_INET6); 382 383 frag6_destroy(); 384 nd6_destroy(); 385 in6_ifattach_destroy(); 386 387 hashdestroy(V_in6_ifaddrhashtbl, M_IFADDR, V_in6_ifaddrhmask); 388 } 389 390 VNET_SYSUNINIT(inet6, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, ip6_destroy, NULL); 391 #endif 392 393 static int 394 ip6_input_hbh(struct mbuf **mp, uint32_t *plen, uint32_t *rtalert, int *off, 395 int *nxt, int *ours) 396 { 397 struct mbuf *m; 398 struct ip6_hdr *ip6; 399 struct ip6_hbh *hbh; 400 401 if (ip6_hopopts_input(plen, rtalert, mp, off)) { 402 #if 0 /*touches NULL pointer*/ 403 in6_ifstat_inc((*mp)->m_pkthdr.rcvif, ifs6_in_discard); 404 #endif 405 goto out; /* m have already been freed */ 406 } 407 408 /* adjust pointer */ 409 m = *mp; 410 ip6 = mtod(m, struct ip6_hdr *); 411 412 /* 413 * if the payload length field is 0 and the next header field 414 * indicates Hop-by-Hop Options header, then a Jumbo Payload 415 * option MUST be included. 416 */ 417 if (ip6->ip6_plen == 0 && *plen == 0) { 418 /* 419 * Note that if a valid jumbo payload option is 420 * contained, ip6_hopopts_input() must set a valid 421 * (non-zero) payload length to the variable plen. 422 */ 423 IP6STAT_INC(ip6s_badoptions); 424 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 425 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 426 icmp6_error(m, ICMP6_PARAM_PROB, 427 ICMP6_PARAMPROB_HEADER, 428 (caddr_t)&ip6->ip6_plen - (caddr_t)ip6); 429 goto out; 430 } 431 /* ip6_hopopts_input() ensures that mbuf is contiguous */ 432 hbh = (struct ip6_hbh *)(ip6 + 1); 433 *nxt = hbh->ip6h_nxt; 434 435 /* 436 * If we are acting as a router and the packet contains a 437 * router alert option, see if we know the option value. 438 * Currently, we only support the option value for MLD, in which 439 * case we should pass the packet to the multicast routing 440 * daemon. 441 */ 442 if (*rtalert != ~0) { 443 switch (*rtalert) { 444 case IP6OPT_RTALERT_MLD: 445 if (V_ip6_forwarding) 446 *ours = 1; 447 break; 448 default: 449 /* 450 * RFC2711 requires unrecognized values must be 451 * silently ignored. 452 */ 453 break; 454 } 455 } 456 457 return (0); 458 459 out: 460 return (1); 461 } 462 463 #ifdef RSS 464 /* 465 * IPv6 direct input routine. 466 * 467 * This is called when reinjecting completed fragments where 468 * all of the previous checking and book-keeping has been done. 469 */ 470 void 471 ip6_direct_input(struct mbuf *m) 472 { 473 int off, nxt; 474 int nest; 475 struct m_tag *mtag; 476 struct ip6_direct_ctx *ip6dc; 477 478 mtag = m_tag_locate(m, MTAG_ABI_IPV6, IPV6_TAG_DIRECT, NULL); 479 KASSERT(mtag != NULL, ("Reinjected packet w/o direct ctx tag!")); 480 481 ip6dc = (struct ip6_direct_ctx *)(mtag + 1); 482 nxt = ip6dc->ip6dc_nxt; 483 off = ip6dc->ip6dc_off; 484 485 nest = 0; 486 487 m_tag_delete(m, mtag); 488 489 while (nxt != IPPROTO_DONE) { 490 if (V_ip6_hdrnestlimit && (++nest > V_ip6_hdrnestlimit)) { 491 IP6STAT_INC(ip6s_toomanyhdr); 492 goto bad; 493 } 494 495 /* 496 * protection against faulty packet - there should be 497 * more sanity checks in header chain processing. 498 */ 499 if (m->m_pkthdr.len < off) { 500 IP6STAT_INC(ip6s_tooshort); 501 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 502 goto bad; 503 } 504 505 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 506 if (IPSEC_ENABLED(ipv6)) { 507 if (IPSEC_INPUT(ipv6, m, off, nxt) != 0) 508 return; 509 } 510 #endif /* IPSEC */ 511 512 nxt = ip6_protox[nxt](&m, &off, nxt); 513 } 514 return; 515 bad: 516 m_freem(m); 517 } 518 #endif 519 520 void 521 ip6_input(struct mbuf *m) 522 { 523 struct in6_addr odst; 524 struct ip6_hdr *ip6; 525 struct in6_ifaddr *ia; 526 struct ifnet *rcvif; 527 u_int32_t plen; 528 u_int32_t rtalert = ~0; 529 int off = sizeof(struct ip6_hdr), nest; 530 int nxt, ours = 0; 531 int srcrt = 0; 532 533 /* 534 * Drop the packet if IPv6 operation is disabled on the interface. 535 */ 536 rcvif = m->m_pkthdr.rcvif; 537 if ((ND_IFINFO(rcvif)->flags & ND6_IFF_IFDISABLED)) 538 goto bad; 539 540 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 541 /* 542 * should the inner packet be considered authentic? 543 * see comment in ah4_input(). 544 * NB: m cannot be NULL when passed to the input routine 545 */ 546 547 m->m_flags &= ~M_AUTHIPHDR; 548 m->m_flags &= ~M_AUTHIPDGM; 549 550 #endif /* IPSEC */ 551 552 if (m->m_flags & M_FASTFWD_OURS) { 553 /* 554 * Firewall changed destination to local. 555 */ 556 ip6 = mtod(m, struct ip6_hdr *); 557 goto passin; 558 } 559 560 /* 561 * mbuf statistics 562 */ 563 if (m->m_flags & M_EXT) { 564 if (m->m_next) 565 IP6STAT_INC(ip6s_mext2m); 566 else 567 IP6STAT_INC(ip6s_mext1); 568 } else { 569 if (m->m_next) { 570 struct ifnet *ifp = (m->m_flags & M_LOOP) ? V_loif : rcvif; 571 int ifindex = ifp->if_index; 572 if (ifindex >= IP6S_M2MMAX) 573 ifindex = 0; 574 IP6STAT_INC(ip6s_m2m[ifindex]); 575 } else 576 IP6STAT_INC(ip6s_m1); 577 } 578 579 in6_ifstat_inc(rcvif, ifs6_in_receive); 580 IP6STAT_INC(ip6s_total); 581 582 /* 583 * L2 bridge code and some other code can return mbuf chain 584 * that does not conform to KAME requirement. too bad. 585 * XXX: fails to join if interface MTU > MCLBYTES. jumbogram? 586 */ 587 if (m && m->m_next != NULL && m->m_pkthdr.len < MCLBYTES) { 588 struct mbuf *n; 589 590 if (m->m_pkthdr.len > MHLEN) 591 n = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 592 else 593 n = m_gethdr(M_NOWAIT, MT_DATA); 594 if (n == NULL) 595 goto bad; 596 597 m_move_pkthdr(n, m); 598 m_copydata(m, 0, n->m_pkthdr.len, mtod(n, caddr_t)); 599 n->m_len = n->m_pkthdr.len; 600 m_freem(m); 601 m = n; 602 } 603 if (m->m_len < sizeof(struct ip6_hdr)) { 604 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 605 IP6STAT_INC(ip6s_toosmall); 606 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 607 goto bad; 608 } 609 } 610 611 ip6 = mtod(m, struct ip6_hdr *); 612 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 613 IP6STAT_INC(ip6s_badvers); 614 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 615 goto bad; 616 } 617 618 IP6STAT_INC(ip6s_nxthist[ip6->ip6_nxt]); 619 IP_PROBE(receive, NULL, NULL, ip6, rcvif, NULL, ip6); 620 621 /* 622 * Check against address spoofing/corruption. 623 */ 624 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) || 625 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) { 626 /* 627 * XXX: "badscope" is not very suitable for a multicast source. 628 */ 629 IP6STAT_INC(ip6s_badscope); 630 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 631 goto bad; 632 } 633 if (IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) && 634 !(m->m_flags & M_LOOP)) { 635 /* 636 * In this case, the packet should come from the loopback 637 * interface. However, we cannot just check the if_flags, 638 * because ip6_mloopback() passes the "actual" interface 639 * as the outgoing/incoming interface. 640 */ 641 IP6STAT_INC(ip6s_badscope); 642 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 643 goto bad; 644 } 645 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && 646 IPV6_ADDR_MC_SCOPE(&ip6->ip6_dst) == 0) { 647 /* 648 * RFC4291 2.7: 649 * Nodes must not originate a packet to a multicast address 650 * whose scop field contains the reserved value 0; if such 651 * a packet is received, it must be silently dropped. 652 */ 653 IP6STAT_INC(ip6s_badscope); 654 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 655 goto bad; 656 } 657 /* 658 * The following check is not documented in specs. A malicious 659 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack 660 * and bypass security checks (act as if it was from 127.0.0.1 by using 661 * IPv6 src ::ffff:127.0.0.1). Be cautious. 662 * 663 * We have supported IPv6-only kernels for a few years and this issue 664 * has not come up. The world seems to move mostly towards not using 665 * v4mapped on the wire, so it makes sense for us to keep rejecting 666 * any such packets. 667 */ 668 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 669 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 670 IP6STAT_INC(ip6s_badscope); 671 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 672 goto bad; 673 } 674 #if 0 675 /* 676 * Reject packets with IPv4 compatible addresses (auto tunnel). 677 * 678 * The code forbids auto tunnel relay case in RFC1933 (the check is 679 * stronger than RFC1933). We may want to re-enable it if mech-xx 680 * is revised to forbid relaying case. 681 */ 682 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) || 683 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) { 684 IP6STAT_INC(ip6s_badscope); 685 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 686 goto bad; 687 } 688 #endif 689 /* 690 * Try to forward the packet, but if we fail continue. 691 * ip6_tryforward() does not generate redirects, so fall 692 * through to normal processing if redirects are required. 693 * ip6_tryforward() does inbound and outbound packet firewall 694 * processing. If firewall has decided that destination becomes 695 * our local address, it sets M_FASTFWD_OURS flag. In this 696 * case skip another inbound firewall processing and update 697 * ip6 pointer. 698 */ 699 if (V_ip6_forwarding != 0 && V_ip6_sendredirects == 0 700 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 701 && (!IPSEC_ENABLED(ipv6) || 702 IPSEC_CAPS(ipv6, m, IPSEC_CAP_OPERABLE) == 0) 703 #endif 704 ) { 705 if ((m = ip6_tryforward(m)) == NULL) 706 return; 707 if (m->m_flags & M_FASTFWD_OURS) { 708 ip6 = mtod(m, struct ip6_hdr *); 709 goto passin; 710 } 711 } 712 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 713 /* 714 * Bypass packet filtering for packets previously handled by IPsec. 715 */ 716 if (IPSEC_ENABLED(ipv6) && 717 IPSEC_CAPS(ipv6, m, IPSEC_CAP_BYPASS_FILTER) != 0) 718 goto passin; 719 #endif 720 /* 721 * Run through list of hooks for input packets. 722 * 723 * NB: Beware of the destination address changing 724 * (e.g. by NAT rewriting). When this happens, 725 * tell ip6_forward to do the right thing. 726 */ 727 728 /* Jump over all PFIL processing if hooks are not active. */ 729 if (!PFIL_HOOKED_IN(V_inet6_pfil_head)) 730 goto passin; 731 732 odst = ip6->ip6_dst; 733 if (pfil_mbuf_in(V_inet6_pfil_head, &m, m->m_pkthdr.rcvif, 734 NULL) != PFIL_PASS) 735 return; 736 ip6 = mtod(m, struct ip6_hdr *); 737 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst); 738 if ((m->m_flags & (M_IP6_NEXTHOP | M_FASTFWD_OURS)) == M_IP6_NEXTHOP && 739 m_tag_find(m, PACKET_TAG_IPFORWARD, NULL) != NULL) { 740 /* 741 * Directly ship the packet on. This allows forwarding 742 * packets originally destined to us to some other directly 743 * connected host. 744 */ 745 ip6_forward(m, 1); 746 return; 747 } 748 749 passin: 750 /* 751 * Disambiguate address scope zones (if there is ambiguity). 752 * We first make sure that the original source or destination address 753 * is not in our internal form for scoped addresses. Such addresses 754 * are not necessarily invalid spec-wise, but we cannot accept them due 755 * to the usage conflict. 756 * in6_setscope() then also checks and rejects the cases where src or 757 * dst are the loopback address and the receiving interface 758 * is not loopback. 759 */ 760 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) { 761 IP6STAT_INC(ip6s_badscope); /* XXX */ 762 goto bad; 763 } 764 if (in6_setscope(&ip6->ip6_src, rcvif, NULL) || 765 in6_setscope(&ip6->ip6_dst, rcvif, NULL)) { 766 IP6STAT_INC(ip6s_badscope); 767 goto bad; 768 } 769 if (m->m_flags & M_FASTFWD_OURS) { 770 m->m_flags &= ~M_FASTFWD_OURS; 771 ours = 1; 772 goto hbhcheck; 773 } 774 /* 775 * Multicast check. Assume packet is for us to avoid 776 * prematurely taking locks. 777 */ 778 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 779 ours = 1; 780 in6_ifstat_inc(rcvif, ifs6_in_mcast); 781 goto hbhcheck; 782 } 783 /* 784 * Unicast check 785 * XXX: For now we keep link-local IPv6 addresses with embedded 786 * scope zone id, therefore we use zero zoneid here. 787 */ 788 ia = in6ifa_ifwithaddr(&ip6->ip6_dst, 0 /* XXX */, false); 789 if (ia != NULL) { 790 if (ia->ia6_flags & IN6_IFF_NOTREADY) { 791 char ip6bufs[INET6_ADDRSTRLEN]; 792 char ip6bufd[INET6_ADDRSTRLEN]; 793 /* address is not ready, so discard the packet. */ 794 nd6log((LOG_INFO, 795 "ip6_input: packet to an unready address %s->%s\n", 796 ip6_sprintf(ip6bufs, &ip6->ip6_src), 797 ip6_sprintf(ip6bufd, &ip6->ip6_dst))); 798 goto bad; 799 } 800 if (V_ip6_sav && !(m->m_flags & M_LOOP) && 801 __predict_false(in6_localip_fib(&ip6->ip6_src, 802 rcvif->if_fib))) { 803 IP6STAT_INC(ip6s_badscope); /* XXX */ 804 goto bad; 805 } 806 /* Count the packet in the ip address stats */ 807 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1); 808 counter_u64_add(ia->ia_ifa.ifa_ibytes, m->m_pkthdr.len); 809 ours = 1; 810 goto hbhcheck; 811 } 812 813 /* 814 * Now there is no reason to process the packet if it's not our own 815 * and we're not a router. 816 */ 817 if (!V_ip6_forwarding) { 818 IP6STAT_INC(ip6s_cantforward); 819 goto bad; 820 } 821 822 hbhcheck: 823 /* 824 * Process Hop-by-Hop options header if it's contained. 825 * m may be modified in ip6_hopopts_input(). 826 * If a JumboPayload option is included, plen will also be modified. 827 */ 828 plen = (u_int32_t)ntohs(ip6->ip6_plen); 829 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 830 if (ip6_input_hbh(&m, &plen, &rtalert, &off, &nxt, &ours) != 0) 831 return; 832 } else 833 nxt = ip6->ip6_nxt; 834 835 /* 836 * Use mbuf flags to propagate Router Alert option to 837 * ICMPv6 layer, as hop-by-hop options have been stripped. 838 */ 839 if (rtalert != ~0) 840 m->m_flags |= M_RTALERT_MLD; 841 842 /* 843 * Check that the amount of data in the buffers 844 * is as at least much as the IPv6 header would have us expect. 845 * Trim mbufs if longer than we expect. 846 * Drop packet if shorter than we expect. 847 */ 848 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 849 IP6STAT_INC(ip6s_tooshort); 850 in6_ifstat_inc(rcvif, ifs6_in_truncated); 851 goto bad; 852 } 853 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 854 if (m->m_len == m->m_pkthdr.len) { 855 m->m_len = sizeof(struct ip6_hdr) + plen; 856 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 857 } else 858 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 859 } 860 861 /* 862 * Forward if desirable. 863 */ 864 if (V_ip6_mrouter && 865 IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 866 /* 867 * If we are acting as a multicast router, all 868 * incoming multicast packets are passed to the 869 * kernel-level multicast forwarding function. 870 * The packet is returned (relatively) intact; if 871 * ip6_mforward() returns a non-zero value, the packet 872 * must be discarded, else it may be accepted below. 873 * 874 * XXX TODO: Check hlim and multicast scope here to avoid 875 * unnecessarily calling into ip6_mforward(). 876 */ 877 if (ip6_mforward && ip6_mforward(ip6, rcvif, m)) { 878 IP6STAT_INC(ip6s_cantforward); 879 goto bad; 880 } 881 } else if (!ours) { 882 ip6_forward(m, srcrt); 883 return; 884 } 885 886 /* 887 * Tell launch routine the next header 888 */ 889 IP6STAT_INC(ip6s_delivered); 890 in6_ifstat_inc(rcvif, ifs6_in_deliver); 891 nest = 0; 892 893 while (nxt != IPPROTO_DONE) { 894 if (V_ip6_hdrnestlimit && (++nest > V_ip6_hdrnestlimit)) { 895 IP6STAT_INC(ip6s_toomanyhdr); 896 goto bad; 897 } 898 899 /* 900 * protection against faulty packet - there should be 901 * more sanity checks in header chain processing. 902 */ 903 if (m->m_pkthdr.len < off) { 904 IP6STAT_INC(ip6s_tooshort); 905 in6_ifstat_inc(rcvif, ifs6_in_truncated); 906 goto bad; 907 } 908 909 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 910 if (IPSEC_ENABLED(ipv6)) { 911 if (IPSEC_INPUT(ipv6, m, off, nxt) != 0) 912 return; 913 } 914 #endif /* IPSEC */ 915 916 nxt = ip6_protox[nxt](&m, &off, nxt); 917 } 918 return; 919 bad: 920 in6_ifstat_inc(rcvif, ifs6_in_discard); 921 if (m != NULL) 922 m_freem(m); 923 } 924 925 /* 926 * Hop-by-Hop options header processing. If a valid jumbo payload option is 927 * included, the real payload length will be stored in plenp. 928 * 929 * rtalertp - XXX: should be stored more smart way 930 */ 931 static int 932 ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp, 933 struct mbuf **mp, int *offp) 934 { 935 struct mbuf *m = *mp; 936 int off = *offp, hbhlen; 937 struct ip6_hbh *hbh; 938 939 /* validation of the length of the header */ 940 if (m->m_len < off + sizeof(*hbh)) { 941 m = m_pullup(m, off + sizeof(*hbh)); 942 if (m == NULL) { 943 IP6STAT_INC(ip6s_exthdrtoolong); 944 *mp = NULL; 945 return (-1); 946 } 947 } 948 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); 949 hbhlen = (hbh->ip6h_len + 1) << 3; 950 951 if (m->m_len < off + hbhlen) { 952 m = m_pullup(m, off + hbhlen); 953 if (m == NULL) { 954 IP6STAT_INC(ip6s_exthdrtoolong); 955 *mp = NULL; 956 return (-1); 957 } 958 } 959 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); 960 off += hbhlen; 961 hbhlen -= sizeof(struct ip6_hbh); 962 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 963 hbhlen, rtalertp, plenp) < 0) { 964 *mp = NULL; 965 return (-1); 966 } 967 968 *offp = off; 969 *mp = m; 970 return (0); 971 } 972 973 /* 974 * Search header for all Hop-by-hop options and process each option. 975 * This function is separate from ip6_hopopts_input() in order to 976 * handle a case where the sending node itself process its hop-by-hop 977 * options header. In such a case, the function is called from ip6_output(). 978 * 979 * The function assumes that hbh header is located right after the IPv6 header 980 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to 981 * opthead + hbhlen is located in contiguous memory region. 982 */ 983 int 984 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen, 985 u_int32_t *rtalertp, u_int32_t *plenp) 986 { 987 struct ip6_hdr *ip6; 988 int optlen = 0; 989 u_int8_t *opt = opthead; 990 u_int16_t rtalert_val; 991 u_int32_t jumboplen; 992 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh); 993 994 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 995 switch (*opt) { 996 case IP6OPT_PAD1: 997 optlen = 1; 998 break; 999 case IP6OPT_PADN: 1000 if (hbhlen < IP6OPT_MINLEN) { 1001 IP6STAT_INC(ip6s_toosmall); 1002 goto bad; 1003 } 1004 optlen = *(opt + 1) + 2; 1005 break; 1006 case IP6OPT_ROUTER_ALERT: 1007 /* XXX may need check for alignment */ 1008 if (hbhlen < IP6OPT_RTALERT_LEN) { 1009 IP6STAT_INC(ip6s_toosmall); 1010 goto bad; 1011 } 1012 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) { 1013 /* XXX stat */ 1014 icmp6_error(m, ICMP6_PARAM_PROB, 1015 ICMP6_PARAMPROB_HEADER, 1016 erroff + opt + 1 - opthead); 1017 return (-1); 1018 } 1019 optlen = IP6OPT_RTALERT_LEN; 1020 bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2); 1021 *rtalertp = ntohs(rtalert_val); 1022 break; 1023 case IP6OPT_JUMBO: 1024 /* XXX may need check for alignment */ 1025 if (hbhlen < IP6OPT_JUMBO_LEN) { 1026 IP6STAT_INC(ip6s_toosmall); 1027 goto bad; 1028 } 1029 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) { 1030 /* XXX stat */ 1031 icmp6_error(m, ICMP6_PARAM_PROB, 1032 ICMP6_PARAMPROB_HEADER, 1033 erroff + opt + 1 - opthead); 1034 return (-1); 1035 } 1036 optlen = IP6OPT_JUMBO_LEN; 1037 1038 /* 1039 * IPv6 packets that have non 0 payload length 1040 * must not contain a jumbo payload option. 1041 */ 1042 ip6 = mtod(m, struct ip6_hdr *); 1043 if (ip6->ip6_plen) { 1044 IP6STAT_INC(ip6s_badoptions); 1045 icmp6_error(m, ICMP6_PARAM_PROB, 1046 ICMP6_PARAMPROB_HEADER, 1047 erroff + opt - opthead); 1048 return (-1); 1049 } 1050 1051 /* 1052 * We may see jumbolen in unaligned location, so 1053 * we'd need to perform bcopy(). 1054 */ 1055 bcopy(opt + 2, &jumboplen, sizeof(jumboplen)); 1056 jumboplen = (u_int32_t)htonl(jumboplen); 1057 1058 #if 1 1059 /* 1060 * if there are multiple jumbo payload options, 1061 * *plenp will be non-zero and the packet will be 1062 * rejected. 1063 * the behavior may need some debate in ipngwg - 1064 * multiple options does not make sense, however, 1065 * there's no explicit mention in specification. 1066 */ 1067 if (*plenp != 0) { 1068 IP6STAT_INC(ip6s_badoptions); 1069 icmp6_error(m, ICMP6_PARAM_PROB, 1070 ICMP6_PARAMPROB_HEADER, 1071 erroff + opt + 2 - opthead); 1072 return (-1); 1073 } 1074 #endif 1075 1076 /* 1077 * jumbo payload length must be larger than 65535. 1078 */ 1079 if (jumboplen <= IPV6_MAXPACKET) { 1080 IP6STAT_INC(ip6s_badoptions); 1081 icmp6_error(m, ICMP6_PARAM_PROB, 1082 ICMP6_PARAMPROB_HEADER, 1083 erroff + opt + 2 - opthead); 1084 return (-1); 1085 } 1086 *plenp = jumboplen; 1087 1088 break; 1089 default: /* unknown option */ 1090 if (hbhlen < IP6OPT_MINLEN) { 1091 IP6STAT_INC(ip6s_toosmall); 1092 goto bad; 1093 } 1094 optlen = ip6_unknown_opt(opt, m, 1095 erroff + opt - opthead); 1096 if (optlen == -1) 1097 return (-1); 1098 optlen += 2; 1099 break; 1100 } 1101 } 1102 1103 return (0); 1104 1105 bad: 1106 m_freem(m); 1107 return (-1); 1108 } 1109 1110 /* 1111 * Unknown option processing. 1112 * The third argument `off' is the offset from the IPv6 header to the option, 1113 * which is necessary if the IPv6 header the and option header and IPv6 header 1114 * is not contiguous in order to return an ICMPv6 error. 1115 */ 1116 int 1117 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off) 1118 { 1119 struct ip6_hdr *ip6; 1120 1121 switch (IP6OPT_TYPE(*optp)) { 1122 case IP6OPT_TYPE_SKIP: /* ignore the option */ 1123 return ((int)*(optp + 1)); 1124 case IP6OPT_TYPE_DISCARD: /* silently discard */ 1125 m_freem(m); 1126 return (-1); 1127 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 1128 IP6STAT_INC(ip6s_badoptions); 1129 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 1130 return (-1); 1131 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 1132 IP6STAT_INC(ip6s_badoptions); 1133 ip6 = mtod(m, struct ip6_hdr *); 1134 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 1135 (m->m_flags & (M_BCAST|M_MCAST))) 1136 m_freem(m); 1137 else 1138 icmp6_error(m, ICMP6_PARAM_PROB, 1139 ICMP6_PARAMPROB_OPTION, off); 1140 return (-1); 1141 } 1142 1143 m_freem(m); /* XXX: NOTREACHED */ 1144 return (-1); 1145 } 1146 1147 /* 1148 * Create the "control" list for this pcb. 1149 * These functions will not modify mbuf chain at all. 1150 * 1151 * The routine will be called from upper layer handlers like tcp6_input(). 1152 * Thus the routine assumes that the caller (tcp6_input) have already 1153 * called m_pullup() and all the extension headers are located in the 1154 * very first mbuf on the mbuf chain. 1155 * 1156 * ip6_savecontrol_v4 will handle those options that are possible to be 1157 * set on a v4-mapped socket. 1158 * ip6_savecontrol will directly call ip6_savecontrol_v4 to handle those 1159 * options and handle the v6-only ones itself. 1160 */ 1161 struct mbuf ** 1162 ip6_savecontrol_v4(struct inpcb *inp, struct mbuf *m, struct mbuf **mp, 1163 int *v4only) 1164 { 1165 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1166 1167 #ifdef SO_TIMESTAMP 1168 if ((inp->inp_socket->so_options & SO_TIMESTAMP) != 0) { 1169 union { 1170 struct timeval tv; 1171 struct bintime bt; 1172 struct timespec ts; 1173 } t; 1174 struct bintime boottimebin, bt1; 1175 struct timespec ts1; 1176 bool stamped; 1177 1178 stamped = false; 1179 switch (inp->inp_socket->so_ts_clock) { 1180 case SO_TS_REALTIME_MICRO: 1181 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1182 M_TSTMP)) { 1183 mbuf_tstmp2timespec(m, &ts1); 1184 timespec2bintime(&ts1, &bt1); 1185 getboottimebin(&boottimebin); 1186 bintime_add(&bt1, &boottimebin); 1187 bintime2timeval(&bt1, &t.tv); 1188 } else { 1189 microtime(&t.tv); 1190 } 1191 *mp = sbcreatecontrol(&t.tv, sizeof(t.tv), 1192 SCM_TIMESTAMP, SOL_SOCKET, M_NOWAIT); 1193 if (*mp != NULL) { 1194 mp = &(*mp)->m_next; 1195 stamped = true; 1196 } 1197 break; 1198 1199 case SO_TS_BINTIME: 1200 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1201 M_TSTMP)) { 1202 mbuf_tstmp2timespec(m, &ts1); 1203 timespec2bintime(&ts1, &t.bt); 1204 getboottimebin(&boottimebin); 1205 bintime_add(&t.bt, &boottimebin); 1206 } else { 1207 bintime(&t.bt); 1208 } 1209 *mp = sbcreatecontrol(&t.bt, sizeof(t.bt), SCM_BINTIME, 1210 SOL_SOCKET, M_NOWAIT); 1211 if (*mp != NULL) { 1212 mp = &(*mp)->m_next; 1213 stamped = true; 1214 } 1215 break; 1216 1217 case SO_TS_REALTIME: 1218 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1219 M_TSTMP)) { 1220 mbuf_tstmp2timespec(m, &t.ts); 1221 getboottimebin(&boottimebin); 1222 bintime2timespec(&boottimebin, &ts1); 1223 timespecadd(&t.ts, &ts1, &t.ts); 1224 } else { 1225 nanotime(&t.ts); 1226 } 1227 *mp = sbcreatecontrol(&t.ts, sizeof(t.ts), 1228 SCM_REALTIME, SOL_SOCKET, M_NOWAIT); 1229 if (*mp != NULL) { 1230 mp = &(*mp)->m_next; 1231 stamped = true; 1232 } 1233 break; 1234 1235 case SO_TS_MONOTONIC: 1236 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1237 M_TSTMP)) 1238 mbuf_tstmp2timespec(m, &t.ts); 1239 else 1240 nanouptime(&t.ts); 1241 *mp = sbcreatecontrol(&t.ts, sizeof(t.ts), 1242 SCM_MONOTONIC, SOL_SOCKET, M_NOWAIT); 1243 if (*mp != NULL) { 1244 mp = &(*mp)->m_next; 1245 stamped = true; 1246 } 1247 break; 1248 1249 default: 1250 panic("unknown (corrupted) so_ts_clock"); 1251 } 1252 if (stamped && (m->m_flags & (M_PKTHDR | M_TSTMP)) == 1253 (M_PKTHDR | M_TSTMP)) { 1254 struct sock_timestamp_info sti; 1255 1256 bzero(&sti, sizeof(sti)); 1257 sti.st_info_flags = ST_INFO_HW; 1258 if ((m->m_flags & M_TSTMP_HPREC) != 0) 1259 sti.st_info_flags |= ST_INFO_HW_HPREC; 1260 *mp = sbcreatecontrol(&sti, sizeof(sti), SCM_TIME_INFO, 1261 SOL_SOCKET, M_NOWAIT); 1262 if (*mp != NULL) 1263 mp = &(*mp)->m_next; 1264 } 1265 } 1266 #endif 1267 1268 #define IS2292(inp, x, y) (((inp)->inp_flags & IN6P_RFC2292) ? (x) : (y)) 1269 /* RFC 2292 sec. 5 */ 1270 if ((inp->inp_flags & IN6P_PKTINFO) != 0) { 1271 struct in6_pktinfo pi6; 1272 1273 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1274 #ifdef INET 1275 struct ip *ip; 1276 1277 ip = mtod(m, struct ip *); 1278 pi6.ipi6_addr.s6_addr32[0] = 0; 1279 pi6.ipi6_addr.s6_addr32[1] = 0; 1280 pi6.ipi6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP; 1281 pi6.ipi6_addr.s6_addr32[3] = ip->ip_dst.s_addr; 1282 #else 1283 /* We won't hit this code */ 1284 bzero(&pi6.ipi6_addr, sizeof(struct in6_addr)); 1285 #endif 1286 } else { 1287 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr)); 1288 in6_clearscope(&pi6.ipi6_addr); /* XXX */ 1289 } 1290 pi6.ipi6_ifindex = 1291 (m && m->m_pkthdr.rcvif) ? m->m_pkthdr.rcvif->if_index : 0; 1292 1293 *mp = sbcreatecontrol(&pi6, sizeof(struct in6_pktinfo), 1294 IS2292(inp, IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6, 1295 M_NOWAIT); 1296 if (*mp) 1297 mp = &(*mp)->m_next; 1298 } 1299 1300 if ((inp->inp_flags & IN6P_HOPLIMIT) != 0) { 1301 int hlim; 1302 1303 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1304 #ifdef INET 1305 struct ip *ip; 1306 1307 ip = mtod(m, struct ip *); 1308 hlim = ip->ip_ttl; 1309 #else 1310 /* We won't hit this code */ 1311 hlim = 0; 1312 #endif 1313 } else { 1314 hlim = ip6->ip6_hlim & 0xff; 1315 } 1316 *mp = sbcreatecontrol(&hlim, sizeof(int), 1317 IS2292(inp, IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), 1318 IPPROTO_IPV6, M_NOWAIT); 1319 if (*mp) 1320 mp = &(*mp)->m_next; 1321 } 1322 1323 if ((inp->inp_flags & IN6P_TCLASS) != 0) { 1324 int tclass; 1325 1326 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1327 #ifdef INET 1328 struct ip *ip; 1329 1330 ip = mtod(m, struct ip *); 1331 tclass = ip->ip_tos; 1332 #else 1333 /* We won't hit this code */ 1334 tclass = 0; 1335 #endif 1336 } else { 1337 u_int32_t flowinfo; 1338 1339 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK); 1340 flowinfo >>= 20; 1341 tclass = flowinfo & 0xff; 1342 } 1343 *mp = sbcreatecontrol(&tclass, sizeof(int), IPV6_TCLASS, 1344 IPPROTO_IPV6, M_NOWAIT); 1345 if (*mp) 1346 mp = &(*mp)->m_next; 1347 } 1348 1349 if (v4only != NULL) { 1350 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1351 *v4only = 1; 1352 } else { 1353 *v4only = 0; 1354 } 1355 } 1356 1357 return (mp); 1358 } 1359 1360 void 1361 ip6_savecontrol(struct inpcb *inp, struct mbuf *m, struct mbuf **mp) 1362 { 1363 struct ip6_hdr *ip6; 1364 int v4only = 0; 1365 1366 mp = ip6_savecontrol_v4(inp, m, mp, &v4only); 1367 if (v4only) 1368 return; 1369 1370 ip6 = mtod(m, struct ip6_hdr *); 1371 /* 1372 * IPV6_HOPOPTS socket option. Recall that we required super-user 1373 * privilege for the option (see ip6_ctloutput), but it might be too 1374 * strict, since there might be some hop-by-hop options which can be 1375 * returned to normal user. 1376 * See also RFC 2292 section 6 (or RFC 3542 section 8). 1377 */ 1378 if ((inp->inp_flags & IN6P_HOPOPTS) != 0) { 1379 /* 1380 * Check if a hop-by-hop options header is contatined in the 1381 * received packet, and if so, store the options as ancillary 1382 * data. Note that a hop-by-hop options header must be 1383 * just after the IPv6 header, which is assured through the 1384 * IPv6 input processing. 1385 */ 1386 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 1387 struct ip6_hbh *hbh; 1388 u_int hbhlen; 1389 1390 hbh = (struct ip6_hbh *)(ip6 + 1); 1391 hbhlen = (hbh->ip6h_len + 1) << 3; 1392 1393 /* 1394 * XXX: We copy the whole header even if a 1395 * jumbo payload option is included, the option which 1396 * is to be removed before returning according to 1397 * RFC2292. 1398 * Note: this constraint is removed in RFC3542 1399 */ 1400 *mp = sbcreatecontrol(hbh, hbhlen, 1401 IS2292(inp, IPV6_2292HOPOPTS, IPV6_HOPOPTS), 1402 IPPROTO_IPV6, M_NOWAIT); 1403 if (*mp) 1404 mp = &(*mp)->m_next; 1405 } 1406 } 1407 1408 if ((inp->inp_flags & (IN6P_RTHDR | IN6P_DSTOPTS)) != 0) { 1409 int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr); 1410 1411 /* 1412 * Search for destination options headers or routing 1413 * header(s) through the header chain, and stores each 1414 * header as ancillary data. 1415 * Note that the order of the headers remains in 1416 * the chain of ancillary data. 1417 */ 1418 while (1) { /* is explicit loop prevention necessary? */ 1419 struct ip6_ext *ip6e = NULL; 1420 u_int elen; 1421 1422 /* 1423 * if it is not an extension header, don't try to 1424 * pull it from the chain. 1425 */ 1426 switch (nxt) { 1427 case IPPROTO_DSTOPTS: 1428 case IPPROTO_ROUTING: 1429 case IPPROTO_HOPOPTS: 1430 case IPPROTO_AH: /* is it possible? */ 1431 break; 1432 default: 1433 goto loopend; 1434 } 1435 1436 if (off + sizeof(*ip6e) > m->m_len) 1437 goto loopend; 1438 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off); 1439 if (nxt == IPPROTO_AH) 1440 elen = (ip6e->ip6e_len + 2) << 2; 1441 else 1442 elen = (ip6e->ip6e_len + 1) << 3; 1443 if (off + elen > m->m_len) 1444 goto loopend; 1445 1446 switch (nxt) { 1447 case IPPROTO_DSTOPTS: 1448 if (!(inp->inp_flags & IN6P_DSTOPTS)) 1449 break; 1450 1451 *mp = sbcreatecontrol(ip6e, elen, 1452 IS2292(inp, IPV6_2292DSTOPTS, IPV6_DSTOPTS), 1453 IPPROTO_IPV6, M_NOWAIT); 1454 if (*mp) 1455 mp = &(*mp)->m_next; 1456 break; 1457 case IPPROTO_ROUTING: 1458 if (!(inp->inp_flags & IN6P_RTHDR)) 1459 break; 1460 1461 *mp = sbcreatecontrol(ip6e, elen, 1462 IS2292(inp, IPV6_2292RTHDR, IPV6_RTHDR), 1463 IPPROTO_IPV6, M_NOWAIT); 1464 if (*mp) 1465 mp = &(*mp)->m_next; 1466 break; 1467 case IPPROTO_HOPOPTS: 1468 case IPPROTO_AH: /* is it possible? */ 1469 break; 1470 1471 default: 1472 /* 1473 * other cases have been filtered in the above. 1474 * none will visit this case. here we supply 1475 * the code just in case (nxt overwritten or 1476 * other cases). 1477 */ 1478 goto loopend; 1479 } 1480 1481 /* proceed with the next header. */ 1482 off += elen; 1483 nxt = ip6e->ip6e_nxt; 1484 ip6e = NULL; 1485 } 1486 loopend: 1487 ; 1488 } 1489 1490 if (inp->inp_flags2 & INP_RECVFLOWID) { 1491 uint32_t flowid, flow_type; 1492 1493 flowid = m->m_pkthdr.flowid; 1494 flow_type = M_HASHTYPE_GET(m); 1495 1496 /* 1497 * XXX should handle the failure of one or the 1498 * other - don't populate both? 1499 */ 1500 *mp = sbcreatecontrol(&flowid, sizeof(uint32_t), IPV6_FLOWID, 1501 IPPROTO_IPV6, M_NOWAIT); 1502 if (*mp) 1503 mp = &(*mp)->m_next; 1504 *mp = sbcreatecontrol(&flow_type, sizeof(uint32_t), 1505 IPV6_FLOWTYPE, IPPROTO_IPV6, M_NOWAIT); 1506 if (*mp) 1507 mp = &(*mp)->m_next; 1508 } 1509 1510 #ifdef RSS 1511 if (inp->inp_flags2 & INP_RECVRSSBUCKETID) { 1512 uint32_t flowid, flow_type; 1513 uint32_t rss_bucketid; 1514 1515 flowid = m->m_pkthdr.flowid; 1516 flow_type = M_HASHTYPE_GET(m); 1517 1518 if (rss_hash2bucket(flowid, flow_type, &rss_bucketid) == 0) { 1519 *mp = sbcreatecontrol(&rss_bucketid, sizeof(uint32_t), 1520 IPV6_RSSBUCKETID, IPPROTO_IPV6, M_NOWAIT); 1521 if (*mp) 1522 mp = &(*mp)->m_next; 1523 } 1524 } 1525 #endif 1526 1527 } 1528 #undef IS2292 1529 1530 void 1531 ip6_notify_pmtu(struct inpcb *inp, struct sockaddr_in6 *dst, u_int32_t mtu) 1532 { 1533 struct socket *so; 1534 struct mbuf *m_mtu; 1535 struct ip6_mtuinfo mtuctl; 1536 1537 KASSERT(inp != NULL, ("%s: inp == NULL", __func__)); 1538 /* 1539 * Notify the error by sending IPV6_PATHMTU ancillary data if 1540 * application wanted to know the MTU value. 1541 * NOTE: we notify disconnected sockets, because some udp 1542 * applications keep sending sockets disconnected. 1543 * NOTE: our implementation doesn't notify connected sockets that has 1544 * foreign address that is different than given destination addresses 1545 * (this is permitted by RFC 3542). 1546 */ 1547 if ((inp->inp_flags & IN6P_MTU) == 0 || ( 1548 !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 1549 !IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &dst->sin6_addr))) 1550 return; 1551 1552 mtuctl.ip6m_mtu = mtu; 1553 mtuctl.ip6m_addr = *dst; 1554 if (sa6_recoverscope(&mtuctl.ip6m_addr)) 1555 return; 1556 1557 if ((m_mtu = sbcreatecontrol(&mtuctl, sizeof(mtuctl), IPV6_PATHMTU, 1558 IPPROTO_IPV6, M_NOWAIT)) == NULL) 1559 return; 1560 1561 so = inp->inp_socket; 1562 if (sbappendaddr(&so->so_rcv, (struct sockaddr *)dst, NULL, m_mtu) 1563 == 0) { 1564 soroverflow(so); 1565 m_freem(m_mtu); 1566 /* XXX: should count statistics */ 1567 } else 1568 sorwakeup(so); 1569 } 1570 1571 /* 1572 * Get pointer to the previous header followed by the header 1573 * currently processed. 1574 */ 1575 int 1576 ip6_get_prevhdr(const struct mbuf *m, int off) 1577 { 1578 struct ip6_ext ip6e; 1579 struct ip6_hdr *ip6; 1580 int len, nlen, nxt; 1581 1582 if (off == sizeof(struct ip6_hdr)) 1583 return (offsetof(struct ip6_hdr, ip6_nxt)); 1584 if (off < sizeof(struct ip6_hdr)) 1585 panic("%s: off < sizeof(struct ip6_hdr)", __func__); 1586 1587 ip6 = mtod(m, struct ip6_hdr *); 1588 nxt = ip6->ip6_nxt; 1589 len = sizeof(struct ip6_hdr); 1590 nlen = 0; 1591 while (len < off) { 1592 m_copydata(m, len, sizeof(ip6e), (caddr_t)&ip6e); 1593 switch (nxt) { 1594 case IPPROTO_FRAGMENT: 1595 nlen = sizeof(struct ip6_frag); 1596 break; 1597 case IPPROTO_AH: 1598 nlen = (ip6e.ip6e_len + 2) << 2; 1599 break; 1600 default: 1601 nlen = (ip6e.ip6e_len + 1) << 3; 1602 } 1603 len += nlen; 1604 nxt = ip6e.ip6e_nxt; 1605 } 1606 return (len - nlen); 1607 } 1608 1609 /* 1610 * get next header offset. m will be retained. 1611 */ 1612 int 1613 ip6_nexthdr(const struct mbuf *m, int off, int proto, int *nxtp) 1614 { 1615 struct ip6_hdr ip6; 1616 struct ip6_ext ip6e; 1617 struct ip6_frag fh; 1618 1619 /* just in case */ 1620 if (m == NULL) 1621 panic("ip6_nexthdr: m == NULL"); 1622 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off) 1623 return -1; 1624 1625 switch (proto) { 1626 case IPPROTO_IPV6: 1627 if (m->m_pkthdr.len < off + sizeof(ip6)) 1628 return -1; 1629 m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6); 1630 if (nxtp) 1631 *nxtp = ip6.ip6_nxt; 1632 off += sizeof(ip6); 1633 return off; 1634 1635 case IPPROTO_FRAGMENT: 1636 /* 1637 * terminate parsing if it is not the first fragment, 1638 * it does not make sense to parse through it. 1639 */ 1640 if (m->m_pkthdr.len < off + sizeof(fh)) 1641 return -1; 1642 m_copydata(m, off, sizeof(fh), (caddr_t)&fh); 1643 /* IP6F_OFF_MASK = 0xfff8(BigEndian), 0xf8ff(LittleEndian) */ 1644 if (fh.ip6f_offlg & IP6F_OFF_MASK) 1645 return -1; 1646 if (nxtp) 1647 *nxtp = fh.ip6f_nxt; 1648 off += sizeof(struct ip6_frag); 1649 return off; 1650 1651 case IPPROTO_AH: 1652 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1653 return -1; 1654 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1655 if (nxtp) 1656 *nxtp = ip6e.ip6e_nxt; 1657 off += (ip6e.ip6e_len + 2) << 2; 1658 return off; 1659 1660 case IPPROTO_HOPOPTS: 1661 case IPPROTO_ROUTING: 1662 case IPPROTO_DSTOPTS: 1663 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1664 return -1; 1665 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1666 if (nxtp) 1667 *nxtp = ip6e.ip6e_nxt; 1668 off += (ip6e.ip6e_len + 1) << 3; 1669 return off; 1670 1671 case IPPROTO_NONE: 1672 case IPPROTO_ESP: 1673 case IPPROTO_IPCOMP: 1674 /* give up */ 1675 return -1; 1676 1677 default: 1678 return -1; 1679 } 1680 1681 /* NOTREACHED */ 1682 } 1683 1684 /* 1685 * get offset for the last header in the chain. m will be kept untainted. 1686 */ 1687 int 1688 ip6_lasthdr(const struct mbuf *m, int off, int proto, int *nxtp) 1689 { 1690 int newoff; 1691 int nxt; 1692 1693 if (!nxtp) { 1694 nxt = -1; 1695 nxtp = &nxt; 1696 } 1697 while (1) { 1698 newoff = ip6_nexthdr(m, off, proto, nxtp); 1699 if (newoff < 0) 1700 return off; 1701 else if (newoff < off) 1702 return -1; /* invalid */ 1703 else if (newoff == off) 1704 return newoff; 1705 1706 off = newoff; 1707 proto = *nxtp; 1708 } 1709 }
Cache object: fd0060379d1b2431af56cae698e29187
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