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 63 #include "opt_inet.h" 64 #include "opt_inet6.h" 65 #include "opt_ipsec.h" 66 #include "opt_route.h" 67 #include "opt_rss.h" 68 #include "opt_sctp.h" 69 70 #include <sys/param.h> 71 #include <sys/systm.h> 72 #include <sys/hhook.h> 73 #include <sys/malloc.h> 74 #include <sys/mbuf.h> 75 #include <sys/proc.h> 76 #include <sys/domain.h> 77 #include <sys/protosw.h> 78 #include <sys/sdt.h> 79 #include <sys/socket.h> 80 #include <sys/socketvar.h> 81 #include <sys/errno.h> 82 #include <sys/time.h> 83 #include <sys/kernel.h> 84 #include <sys/lock.h> 85 #include <sys/rmlock.h> 86 #include <sys/syslog.h> 87 #include <sys/sysctl.h> 88 #include <sys/eventhandler.h> 89 90 #include <net/if.h> 91 #include <net/if_var.h> 92 #include <net/if_types.h> 93 #include <net/if_private.h> 94 #include <net/if_dl.h> 95 #include <net/route.h> 96 #include <net/netisr.h> 97 #include <net/rss_config.h> 98 #include <net/pfil.h> 99 #include <net/vnet.h> 100 101 #include <netinet/in.h> 102 #include <netinet/in_kdtrace.h> 103 #include <netinet/ip_var.h> 104 #include <netinet/in_systm.h> 105 #include <net/if_llatbl.h> 106 #ifdef INET 107 #include <netinet/ip.h> 108 #include <netinet/ip_icmp.h> 109 #endif /* INET */ 110 #include <netinet/ip6.h> 111 #include <netinet6/in6_var.h> 112 #include <netinet6/ip6_var.h> 113 #include <netinet/ip_encap.h> 114 #include <netinet/in_pcb.h> 115 #include <netinet/icmp6.h> 116 #include <netinet6/scope6_var.h> 117 #include <netinet6/in6_ifattach.h> 118 #include <netinet6/mld6_var.h> 119 #include <netinet6/nd6.h> 120 #include <netinet6/in6_rss.h> 121 #ifdef SCTP 122 #include <netinet/sctp_pcb.h> 123 #include <netinet6/sctp6_var.h> 124 #endif 125 126 #include <netipsec/ipsec_support.h> 127 128 ip6proto_input_t *ip6_protox[IPPROTO_MAX] = { 129 [0 ... IPPROTO_MAX - 1] = rip6_input }; 130 ip6proto_ctlinput_t *ip6_ctlprotox[IPPROTO_MAX] = { 131 [0 ... IPPROTO_MAX - 1] = rip6_ctlinput }; 132 133 VNET_DEFINE(struct in6_ifaddrhead, in6_ifaddrhead); 134 VNET_DEFINE(struct in6_ifaddrlisthead *, in6_ifaddrhashtbl); 135 VNET_DEFINE(u_long, in6_ifaddrhmask); 136 137 static struct netisr_handler ip6_nh = { 138 .nh_name = "ip6", 139 .nh_handler = ip6_input, 140 .nh_proto = NETISR_IPV6, 141 #ifdef RSS 142 .nh_m2cpuid = rss_soft_m2cpuid_v6, 143 .nh_policy = NETISR_POLICY_CPU, 144 .nh_dispatch = NETISR_DISPATCH_HYBRID, 145 #else 146 .nh_policy = NETISR_POLICY_FLOW, 147 #endif 148 }; 149 150 static int 151 sysctl_netinet6_intr_queue_maxlen(SYSCTL_HANDLER_ARGS) 152 { 153 int error, qlimit; 154 155 netisr_getqlimit(&ip6_nh, &qlimit); 156 error = sysctl_handle_int(oidp, &qlimit, 0, req); 157 if (error || !req->newptr) 158 return (error); 159 if (qlimit < 1) 160 return (EINVAL); 161 return (netisr_setqlimit(&ip6_nh, qlimit)); 162 } 163 SYSCTL_DECL(_net_inet6_ip6); 164 SYSCTL_PROC(_net_inet6_ip6, IPV6CTL_INTRQMAXLEN, intr_queue_maxlen, 165 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 166 0, 0, sysctl_netinet6_intr_queue_maxlen, "I", 167 "Maximum size of the IPv6 input queue"); 168 169 VNET_DEFINE_STATIC(bool, ip6_sav) = true; 170 #define V_ip6_sav VNET(ip6_sav) 171 SYSCTL_BOOL(_net_inet6_ip6, OID_AUTO, source_address_validation, 172 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_sav), true, 173 "Drop incoming packets with source address that is a local address"); 174 175 SYSCTL_UINT(_net_inet6_ip6, OID_AUTO, temp_max_desync_factor, 176 CTLFLAG_RD | CTLFLAG_VNET, 177 &VNET_NAME(ip6_temp_max_desync_factor), 0, 178 "RFC 8981 max desync factor"); 179 180 #ifdef RSS 181 static struct netisr_handler ip6_direct_nh = { 182 .nh_name = "ip6_direct", 183 .nh_handler = ip6_direct_input, 184 .nh_proto = NETISR_IPV6_DIRECT, 185 .nh_m2cpuid = rss_soft_m2cpuid_v6, 186 .nh_policy = NETISR_POLICY_CPU, 187 .nh_dispatch = NETISR_DISPATCH_HYBRID, 188 }; 189 190 static int 191 sysctl_netinet6_intr_direct_queue_maxlen(SYSCTL_HANDLER_ARGS) 192 { 193 int error, qlimit; 194 195 netisr_getqlimit(&ip6_direct_nh, &qlimit); 196 error = sysctl_handle_int(oidp, &qlimit, 0, req); 197 if (error || !req->newptr) 198 return (error); 199 if (qlimit < 1) 200 return (EINVAL); 201 return (netisr_setqlimit(&ip6_direct_nh, qlimit)); 202 } 203 SYSCTL_PROC(_net_inet6_ip6, IPV6CTL_INTRDQMAXLEN, intr_direct_queue_maxlen, 204 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 205 0, 0, sysctl_netinet6_intr_direct_queue_maxlen, "I", 206 "Maximum size of the IPv6 direct input queue"); 207 208 #endif 209 210 VNET_DEFINE(pfil_head_t, inet6_pfil_head); 211 VNET_DEFINE(pfil_head_t, inet6_local_pfil_head); 212 213 VNET_PCPUSTAT_DEFINE(struct ip6stat, ip6stat); 214 VNET_PCPUSTAT_SYSINIT(ip6stat); 215 #ifdef VIMAGE 216 VNET_PCPUSTAT_SYSUNINIT(ip6stat); 217 #endif /* VIMAGE */ 218 219 struct rmlock in6_ifaddr_lock; 220 RM_SYSINIT(in6_ifaddr_lock, &in6_ifaddr_lock, "in6_ifaddr_lock"); 221 222 static int ip6_hopopts_input(u_int32_t *, struct mbuf **, int *); 223 224 /* 225 * IP6 initialization: fill in IP6 protocol switch table. 226 * All protocols not implemented in kernel go to raw IP6 protocol handler. 227 */ 228 static void 229 ip6_vnet_init(void *arg __unused) 230 { 231 struct pfil_head_args args; 232 233 TUNABLE_INT_FETCH("net.inet6.ip6.auto_linklocal", 234 &V_ip6_auto_linklocal); 235 TUNABLE_INT_FETCH("net.inet6.ip6.accept_rtadv", &V_ip6_accept_rtadv); 236 TUNABLE_INT_FETCH("net.inet6.ip6.no_radr", &V_ip6_no_radr); 237 TUNABLE_BOOL_FETCH("net.inet6.ip6.use_stableaddr", &V_ip6_use_stableaddr); 238 239 CK_STAILQ_INIT(&V_in6_ifaddrhead); 240 V_in6_ifaddrhashtbl = hashinit(IN6ADDR_NHASH, M_IFADDR, 241 &V_in6_ifaddrhmask); 242 243 /* Initialize packet filter hooks. */ 244 args.pa_version = PFIL_VERSION; 245 args.pa_flags = PFIL_IN | PFIL_OUT; 246 args.pa_type = PFIL_TYPE_IP6; 247 args.pa_headname = PFIL_INET6_NAME; 248 V_inet6_pfil_head = pfil_head_register(&args); 249 250 args.pa_flags = PFIL_OUT; 251 args.pa_headname = PFIL_INET6_LOCAL_NAME; 252 V_inet6_local_pfil_head = pfil_head_register(&args); 253 254 if (hhook_head_register(HHOOK_TYPE_IPSEC_IN, AF_INET6, 255 &V_ipsec_hhh_in[HHOOK_IPSEC_INET6], 256 HHOOK_WAITOK | HHOOK_HEADISINVNET) != 0) 257 printf("%s: WARNING: unable to register input helper hook\n", 258 __func__); 259 if (hhook_head_register(HHOOK_TYPE_IPSEC_OUT, AF_INET6, 260 &V_ipsec_hhh_out[HHOOK_IPSEC_INET6], 261 HHOOK_WAITOK | HHOOK_HEADISINVNET) != 0) 262 printf("%s: WARNING: unable to register output helper hook\n", 263 __func__); 264 265 scope6_init(); 266 addrsel_policy_init(); 267 nd6_init(); 268 frag6_init(); 269 270 V_ip6_temp_max_desync_factor = TEMP_MAX_DESYNC_FACTOR_BASE + 271 (V_ip6_temp_preferred_lifetime >> 2) + 272 (V_ip6_temp_preferred_lifetime >> 3); 273 V_ip6_desync_factor = arc4random() % V_ip6_temp_max_desync_factor; 274 275 /* Skip global initialization stuff for non-default instances. */ 276 #ifdef VIMAGE 277 netisr_register_vnet(&ip6_nh); 278 #ifdef RSS 279 netisr_register_vnet(&ip6_direct_nh); 280 #endif 281 #endif 282 } 283 VNET_SYSINIT(ip6_vnet_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH, 284 ip6_vnet_init, NULL); 285 286 static void 287 ip6_init(void *arg __unused) 288 { 289 struct ifnet *ifp; 290 291 /* 292 * Register statically those protocols that are unlikely to ever go 293 * dynamic. 294 */ 295 IP6PROTO_REGISTER(IPPROTO_ICMPV6, icmp6_input, rip6_ctlinput); 296 IP6PROTO_REGISTER(IPPROTO_DSTOPTS, dest6_input, NULL); 297 IP6PROTO_REGISTER(IPPROTO_ROUTING, route6_input, NULL); 298 IP6PROTO_REGISTER(IPPROTO_FRAGMENT, frag6_input, NULL); 299 IP6PROTO_REGISTER(IPPROTO_IPV4, encap6_input, NULL); 300 IP6PROTO_REGISTER(IPPROTO_IPV6, encap6_input, NULL); 301 IP6PROTO_REGISTER(IPPROTO_ETHERIP, encap6_input, NULL); 302 IP6PROTO_REGISTER(IPPROTO_GRE, encap6_input, NULL); 303 IP6PROTO_REGISTER(IPPROTO_PIM, encap6_input, NULL); 304 #ifdef SCTP /* XXX: has a loadable & static version */ 305 IP6PROTO_REGISTER(IPPROTO_SCTP, sctp6_input, sctp6_ctlinput); 306 #endif 307 308 EVENTHANDLER_REGISTER(vm_lowmem, frag6_drain, NULL, LOWMEM_PRI_DEFAULT); 309 EVENTHANDLER_REGISTER(mbuf_lowmem, frag6_drain, NULL, 310 LOWMEM_PRI_DEFAULT); 311 312 netisr_register(&ip6_nh); 313 #ifdef RSS 314 netisr_register(&ip6_direct_nh); 315 #endif 316 /* 317 * XXXGL: we use SYSINIT() here, but go over V_ifnet. See comment 318 * in sys/netinet/ip_input.c:ip_init(). 319 */ 320 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) 321 in6_ifarrival(NULL, ifp); 322 } 323 SYSINIT(ip6_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, ip6_init, NULL); 324 325 int 326 ip6proto_register(uint8_t proto, ip6proto_input_t input, 327 ip6proto_ctlinput_t ctl) 328 { 329 330 MPASS(proto > 0); 331 332 if (ip6_protox[proto] == rip6_input) { 333 ip6_protox[proto] = input; 334 ip6_ctlprotox[proto] = ctl; 335 return (0); 336 } else 337 return (EEXIST); 338 } 339 340 int 341 ip6proto_unregister(uint8_t proto) 342 { 343 344 MPASS(proto > 0); 345 346 if (ip6_protox[proto] != rip6_input) { 347 ip6_protox[proto] = rip6_input; 348 ip6_ctlprotox[proto] = rip6_ctlinput; 349 return (0); 350 } else 351 return (ENOENT); 352 } 353 354 #ifdef VIMAGE 355 static void 356 ip6_destroy(void *unused __unused) 357 { 358 struct ifaddr *ifa, *nifa; 359 struct ifnet *ifp; 360 int error; 361 362 #ifdef RSS 363 netisr_unregister_vnet(&ip6_direct_nh); 364 #endif 365 netisr_unregister_vnet(&ip6_nh); 366 367 pfil_head_unregister(V_inet6_pfil_head); 368 error = hhook_head_deregister(V_ipsec_hhh_in[HHOOK_IPSEC_INET6]); 369 if (error != 0) { 370 printf("%s: WARNING: unable to deregister input helper hook " 371 "type HHOOK_TYPE_IPSEC_IN, id HHOOK_IPSEC_INET6: " 372 "error %d returned\n", __func__, error); 373 } 374 error = hhook_head_deregister(V_ipsec_hhh_out[HHOOK_IPSEC_INET6]); 375 if (error != 0) { 376 printf("%s: WARNING: unable to deregister output helper hook " 377 "type HHOOK_TYPE_IPSEC_OUT, id HHOOK_IPSEC_INET6: " 378 "error %d returned\n", __func__, error); 379 } 380 381 /* Cleanup addresses. */ 382 IFNET_RLOCK(); 383 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 384 /* Cannot lock here - lock recursion. */ 385 /* IF_ADDR_LOCK(ifp); */ 386 CK_STAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, nifa) { 387 if (ifa->ifa_addr->sa_family != AF_INET6) 388 continue; 389 in6_purgeaddr(ifa); 390 } 391 /* IF_ADDR_UNLOCK(ifp); */ 392 in6_ifdetach_destroy(ifp); 393 } 394 IFNET_RUNLOCK(); 395 396 /* Make sure any routes are gone as well. */ 397 rib_flush_routes_family(AF_INET6); 398 399 frag6_destroy(); 400 nd6_destroy(); 401 in6_ifattach_destroy(); 402 403 hashdestroy(V_in6_ifaddrhashtbl, M_IFADDR, V_in6_ifaddrhmask); 404 } 405 406 VNET_SYSUNINIT(inet6, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, ip6_destroy, NULL); 407 #endif 408 409 static int 410 ip6_input_hbh(struct mbuf **mp, uint32_t *rtalert, int *off, 411 int *nxt, int *ours) 412 { 413 struct mbuf *m; 414 struct ip6_hdr *ip6; 415 struct ip6_hbh *hbh; 416 417 if (ip6_hopopts_input(rtalert, mp, off)) { 418 #if 0 /*touches NULL pointer*/ 419 in6_ifstat_inc((*mp)->m_pkthdr.rcvif, ifs6_in_discard); 420 #endif 421 goto out; /* m have already been freed */ 422 } 423 424 /* adjust pointer */ 425 m = *mp; 426 ip6 = mtod(m, struct ip6_hdr *); 427 428 /* 429 * If the payload length field is 0 and the next header field indicates 430 * Hop-by-Hop Options header, then a Jumbo Payload option MUST be 431 * included. We no not support Jumbo Payloads so report an error. 432 */ 433 if (ip6->ip6_plen == 0) { 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 /* ip6_hopopts_input() ensures that mbuf is contiguous */ 443 hbh = (struct ip6_hbh *)(ip6 + 1); 444 *nxt = hbh->ip6h_nxt; 445 446 /* 447 * If we are acting as a router and the packet contains a 448 * router alert option, see if we know the option value. 449 * Currently, we only support the option value for MLD, in which 450 * case we should pass the packet to the multicast routing 451 * daemon. 452 */ 453 if (*rtalert != ~0) { 454 switch (*rtalert) { 455 case IP6OPT_RTALERT_MLD: 456 if (V_ip6_forwarding) 457 *ours = 1; 458 break; 459 default: 460 /* 461 * RFC2711 requires unrecognized values must be 462 * silently ignored. 463 */ 464 break; 465 } 466 } 467 468 return (0); 469 470 out: 471 return (1); 472 } 473 474 #ifdef RSS 475 /* 476 * IPv6 direct input routine. 477 * 478 * This is called when reinjecting completed fragments where 479 * all of the previous checking and book-keeping has been done. 480 */ 481 void 482 ip6_direct_input(struct mbuf *m) 483 { 484 int off, nxt; 485 int nest; 486 struct m_tag *mtag; 487 struct ip6_direct_ctx *ip6dc; 488 489 mtag = m_tag_locate(m, MTAG_ABI_IPV6, IPV6_TAG_DIRECT, NULL); 490 KASSERT(mtag != NULL, ("Reinjected packet w/o direct ctx tag!")); 491 492 ip6dc = (struct ip6_direct_ctx *)(mtag + 1); 493 nxt = ip6dc->ip6dc_nxt; 494 off = ip6dc->ip6dc_off; 495 496 nest = 0; 497 498 m_tag_delete(m, mtag); 499 500 while (nxt != IPPROTO_DONE) { 501 if (V_ip6_hdrnestlimit && (++nest > V_ip6_hdrnestlimit)) { 502 IP6STAT_INC(ip6s_toomanyhdr); 503 goto bad; 504 } 505 506 /* 507 * protection against faulty packet - there should be 508 * more sanity checks in header chain processing. 509 */ 510 if (m->m_pkthdr.len < off) { 511 IP6STAT_INC(ip6s_tooshort); 512 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 513 goto bad; 514 } 515 516 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 517 if (IPSEC_ENABLED(ipv6)) { 518 if (IPSEC_INPUT(ipv6, m, off, nxt) != 0) 519 return; 520 } 521 #endif /* IPSEC */ 522 523 nxt = ip6_protox[nxt](&m, &off, nxt); 524 } 525 return; 526 bad: 527 m_freem(m); 528 } 529 #endif 530 531 void 532 ip6_input(struct mbuf *m) 533 { 534 struct in6_addr odst; 535 struct ip6_hdr *ip6; 536 struct in6_ifaddr *ia; 537 struct ifnet *rcvif; 538 u_int32_t plen; 539 u_int32_t rtalert = ~0; 540 int off = sizeof(struct ip6_hdr), nest; 541 int nxt, ours = 0; 542 int srcrt = 0; 543 544 /* 545 * Drop the packet if IPv6 operation is disabled on the interface. 546 */ 547 rcvif = m->m_pkthdr.rcvif; 548 if ((rcvif->if_inet6->nd_flags & ND6_IFF_IFDISABLED)) 549 goto bad; 550 551 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 552 /* 553 * should the inner packet be considered authentic? 554 * see comment in ah4_input(). 555 * NB: m cannot be NULL when passed to the input routine 556 */ 557 558 m->m_flags &= ~M_AUTHIPHDR; 559 m->m_flags &= ~M_AUTHIPDGM; 560 561 #endif /* IPSEC */ 562 563 if (m->m_flags & M_FASTFWD_OURS) { 564 /* 565 * Firewall changed destination to local. 566 */ 567 ip6 = mtod(m, struct ip6_hdr *); 568 goto passin; 569 } 570 571 /* 572 * mbuf statistics 573 */ 574 if (m->m_flags & M_EXT) { 575 if (m->m_next) 576 IP6STAT_INC(ip6s_mext2m); 577 else 578 IP6STAT_INC(ip6s_mext1); 579 } else { 580 if (m->m_next) { 581 struct ifnet *ifp = (m->m_flags & M_LOOP) ? V_loif : rcvif; 582 int ifindex = ifp->if_index; 583 if (ifindex >= IP6S_M2MMAX) 584 ifindex = 0; 585 IP6STAT_INC2(ip6s_m2m, ifindex); 586 } else 587 IP6STAT_INC(ip6s_m1); 588 } 589 590 in6_ifstat_inc(rcvif, ifs6_in_receive); 591 IP6STAT_INC(ip6s_total); 592 593 /* 594 * L2 bridge code and some other code can return mbuf chain 595 * that does not conform to KAME requirement. too bad. 596 * XXX: fails to join if interface MTU > MCLBYTES. jumbogram? 597 */ 598 if (m && m->m_next != NULL && m->m_pkthdr.len < MCLBYTES) { 599 struct mbuf *n; 600 601 if (m->m_pkthdr.len > MHLEN) 602 n = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 603 else 604 n = m_gethdr(M_NOWAIT, MT_DATA); 605 if (n == NULL) 606 goto bad; 607 608 m_move_pkthdr(n, m); 609 m_copydata(m, 0, n->m_pkthdr.len, mtod(n, caddr_t)); 610 n->m_len = n->m_pkthdr.len; 611 m_freem(m); 612 m = n; 613 } 614 if (m->m_len < sizeof(struct ip6_hdr)) { 615 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 616 IP6STAT_INC(ip6s_toosmall); 617 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 618 goto bad; 619 } 620 } 621 622 ip6 = mtod(m, struct ip6_hdr *); 623 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 624 IP6STAT_INC(ip6s_badvers); 625 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 626 goto bad; 627 } 628 629 IP6STAT_INC2(ip6s_nxthist, ip6->ip6_nxt); 630 IP_PROBE(receive, NULL, NULL, ip6, rcvif, NULL, ip6); 631 632 /* 633 * Check against address spoofing/corruption. The unspecified address 634 * is checked further below. 635 */ 636 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) { 637 /* 638 * XXX: "badscope" is not very suitable for a multicast source. 639 */ 640 IP6STAT_INC(ip6s_badscope); 641 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 642 goto bad; 643 } 644 if (IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) && 645 !(m->m_flags & M_LOOP)) { 646 /* 647 * In this case, the packet should come from the loopback 648 * interface. However, we cannot just check the if_flags, 649 * because ip6_mloopback() passes the "actual" interface 650 * as the outgoing/incoming interface. 651 */ 652 IP6STAT_INC(ip6s_badscope); 653 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 654 goto bad; 655 } 656 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && 657 IPV6_ADDR_MC_SCOPE(&ip6->ip6_dst) == 0) { 658 /* 659 * RFC4291 2.7: 660 * Nodes must not originate a packet to a multicast address 661 * whose scop field contains the reserved value 0; if such 662 * a packet is received, it must be silently dropped. 663 */ 664 IP6STAT_INC(ip6s_badscope); 665 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 666 goto bad; 667 } 668 /* 669 * The following check is not documented in specs. A malicious 670 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack 671 * and bypass security checks (act as if it was from 127.0.0.1 by using 672 * IPv6 src ::ffff:127.0.0.1). Be cautious. 673 * 674 * We have supported IPv6-only kernels for a few years and this issue 675 * has not come up. The world seems to move mostly towards not using 676 * v4mapped on the wire, so it makes sense for us to keep rejecting 677 * any such packets. 678 */ 679 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 680 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 681 IP6STAT_INC(ip6s_badscope); 682 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 683 goto bad; 684 } 685 #if 0 686 /* 687 * Reject packets with IPv4 compatible addresses (auto tunnel). 688 * 689 * The code forbids auto tunnel relay case in RFC1933 (the check is 690 * stronger than RFC1933). We may want to re-enable it if mech-xx 691 * is revised to forbid relaying case. 692 */ 693 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) || 694 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) { 695 IP6STAT_INC(ip6s_badscope); 696 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 697 goto bad; 698 } 699 #endif 700 /* 701 * Try to forward the packet, but if we fail continue. 702 * ip6_tryforward() does not generate redirects, so fall 703 * through to normal processing if redirects are required. 704 * ip6_tryforward() does inbound and outbound packet firewall 705 * processing. If firewall has decided that destination becomes 706 * our local address, it sets M_FASTFWD_OURS flag. In this 707 * case skip another inbound firewall processing and update 708 * ip6 pointer. 709 */ 710 if (V_ip6_forwarding != 0 && V_ip6_sendredirects == 0 711 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 712 && (!IPSEC_ENABLED(ipv6) || 713 IPSEC_CAPS(ipv6, m, IPSEC_CAP_OPERABLE) == 0) 714 #endif 715 ) { 716 if ((m = ip6_tryforward(m)) == NULL) 717 return; 718 if (m->m_flags & M_FASTFWD_OURS) { 719 ip6 = mtod(m, struct ip6_hdr *); 720 goto passin; 721 } 722 } 723 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 724 /* 725 * Bypass packet filtering for packets previously handled by IPsec. 726 */ 727 if (IPSEC_ENABLED(ipv6) && 728 IPSEC_CAPS(ipv6, m, IPSEC_CAP_BYPASS_FILTER) != 0) 729 goto passin; 730 #endif 731 /* 732 * Run through list of hooks for input packets. 733 * 734 * NB: Beware of the destination address changing 735 * (e.g. by NAT rewriting). When this happens, 736 * tell ip6_forward to do the right thing. 737 */ 738 739 /* Jump over all PFIL processing if hooks are not active. */ 740 if (!PFIL_HOOKED_IN(V_inet6_pfil_head)) 741 goto passin; 742 743 odst = ip6->ip6_dst; 744 if (pfil_mbuf_in(V_inet6_pfil_head, &m, m->m_pkthdr.rcvif, 745 NULL) != PFIL_PASS) 746 return; 747 ip6 = mtod(m, struct ip6_hdr *); 748 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst); 749 if ((m->m_flags & (M_IP6_NEXTHOP | M_FASTFWD_OURS)) == M_IP6_NEXTHOP && 750 m_tag_find(m, PACKET_TAG_IPFORWARD, NULL) != NULL) { 751 /* 752 * Directly ship the packet on. This allows forwarding 753 * packets originally destined to us to some other directly 754 * connected host. 755 */ 756 ip6_forward(m, 1); 757 return; 758 } 759 760 passin: 761 /* 762 * The check is deferred to here to give firewalls a chance to block 763 * (and log) such packets. ip6_tryforward() will not process such 764 * packets. 765 */ 766 if (__predict_false(IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst))) { 767 IP6STAT_INC(ip6s_badscope); 768 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 769 goto bad; 770 } 771 772 plen = (uint32_t)ntohs(ip6->ip6_plen); 773 774 /* 775 * We don't support Jumbograms, reject packets with plen == 0 as early 776 * as we can. 777 */ 778 if (plen == 0) 779 goto bad; 780 781 /* 782 * Disambiguate address scope zones (if there is ambiguity). 783 * We first make sure that the original source or destination address 784 * is not in our internal form for scoped addresses. Such addresses 785 * are not necessarily invalid spec-wise, but we cannot accept them due 786 * to the usage conflict. 787 * in6_setscope() then also checks and rejects the cases where src or 788 * dst are the loopback address and the receiving interface 789 * is not loopback. 790 */ 791 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) { 792 IP6STAT_INC(ip6s_badscope); /* XXX */ 793 goto bad; 794 } 795 if (in6_setscope(&ip6->ip6_src, rcvif, NULL) || 796 in6_setscope(&ip6->ip6_dst, rcvif, NULL)) { 797 IP6STAT_INC(ip6s_badscope); 798 goto bad; 799 } 800 if (m->m_flags & M_FASTFWD_OURS) { 801 m->m_flags &= ~M_FASTFWD_OURS; 802 ours = 1; 803 goto hbhcheck; 804 } 805 /* 806 * Multicast check. Assume packet is for us to avoid 807 * prematurely taking locks. 808 */ 809 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 810 ours = 1; 811 in6_ifstat_inc(rcvif, ifs6_in_mcast); 812 goto hbhcheck; 813 } 814 /* 815 * Unicast check 816 * XXX: For now we keep link-local IPv6 addresses with embedded 817 * scope zone id, therefore we use zero zoneid here. 818 */ 819 ia = in6ifa_ifwithaddr(&ip6->ip6_dst, 0 /* XXX */, false); 820 if (ia != NULL) { 821 if (ia->ia6_flags & IN6_IFF_NOTREADY) { 822 char ip6bufs[INET6_ADDRSTRLEN]; 823 char ip6bufd[INET6_ADDRSTRLEN]; 824 /* address is not ready, so discard the packet. */ 825 nd6log((LOG_INFO, 826 "ip6_input: packet to an unready address %s->%s\n", 827 ip6_sprintf(ip6bufs, &ip6->ip6_src), 828 ip6_sprintf(ip6bufd, &ip6->ip6_dst))); 829 goto bad; 830 } 831 if (V_ip6_sav && !(m->m_flags & M_LOOP) && 832 __predict_false(in6_localip_fib(&ip6->ip6_src, 833 rcvif->if_fib))) { 834 IP6STAT_INC(ip6s_badscope); /* XXX */ 835 goto bad; 836 } 837 /* Count the packet in the ip address stats */ 838 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1); 839 counter_u64_add(ia->ia_ifa.ifa_ibytes, m->m_pkthdr.len); 840 ours = 1; 841 goto hbhcheck; 842 } 843 844 /* 845 * Now there is no reason to process the packet if it's not our own 846 * and we're not a router. 847 */ 848 if (!V_ip6_forwarding) { 849 IP6STAT_INC(ip6s_cantforward); 850 goto bad; 851 } 852 853 hbhcheck: 854 /* 855 * Process Hop-by-Hop options header if it's contained. 856 * m may be modified in ip6_hopopts_input(). 857 */ 858 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 859 if (ip6_input_hbh(&m, &rtalert, &off, &nxt, &ours) != 0) 860 return; 861 } else 862 nxt = ip6->ip6_nxt; 863 864 /* 865 * Use mbuf flags to propagate Router Alert option to 866 * ICMPv6 layer, as hop-by-hop options have been stripped. 867 */ 868 if (rtalert != ~0) 869 m->m_flags |= M_RTALERT_MLD; 870 871 /* 872 * Check that the amount of data in the buffers 873 * is as at least much as the IPv6 header would have us expect. 874 * Trim mbufs if longer than we expect. 875 * Drop packet if shorter than we expect. 876 */ 877 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 878 IP6STAT_INC(ip6s_tooshort); 879 in6_ifstat_inc(rcvif, ifs6_in_truncated); 880 goto bad; 881 } 882 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 883 if (m->m_len == m->m_pkthdr.len) { 884 m->m_len = sizeof(struct ip6_hdr) + plen; 885 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 886 } else 887 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 888 } 889 890 /* 891 * Forward if desirable. 892 */ 893 if (V_ip6_mrouter && 894 IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 895 /* 896 * If we are acting as a multicast router, all 897 * incoming multicast packets are passed to the 898 * kernel-level multicast forwarding function. 899 * The packet is returned (relatively) intact; if 900 * ip6_mforward() returns a non-zero value, the packet 901 * must be discarded, else it may be accepted below. 902 * 903 * XXX TODO: Check hlim and multicast scope here to avoid 904 * unnecessarily calling into ip6_mforward(). 905 */ 906 if (ip6_mforward && ip6_mforward(ip6, rcvif, m)) { 907 IP6STAT_INC(ip6s_cantforward); 908 goto bad; 909 } 910 } else if (!ours) { 911 ip6_forward(m, srcrt); 912 return; 913 } 914 915 /* 916 * We are going to ship the packet to the local protocol stack. Call the 917 * filter again for this 'output' action, allowing redirect-like rules 918 * to adjust the source address. 919 */ 920 if (PFIL_HOOKED_OUT(V_inet6_local_pfil_head)) { 921 if (pfil_mbuf_out(V_inet6_local_pfil_head, &m, V_loif, NULL) != 922 PFIL_PASS) 923 return; 924 ip6 = mtod(m, struct ip6_hdr *); 925 } 926 927 /* 928 * Tell launch routine the next header 929 */ 930 IP6STAT_INC(ip6s_delivered); 931 in6_ifstat_inc(rcvif, ifs6_in_deliver); 932 nest = 0; 933 934 while (nxt != IPPROTO_DONE) { 935 if (V_ip6_hdrnestlimit && (++nest > V_ip6_hdrnestlimit)) { 936 IP6STAT_INC(ip6s_toomanyhdr); 937 goto bad; 938 } 939 940 /* 941 * protection against faulty packet - there should be 942 * more sanity checks in header chain processing. 943 */ 944 if (m->m_pkthdr.len < off) { 945 IP6STAT_INC(ip6s_tooshort); 946 in6_ifstat_inc(rcvif, ifs6_in_truncated); 947 goto bad; 948 } 949 950 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 951 if (IPSEC_ENABLED(ipv6)) { 952 if (IPSEC_INPUT(ipv6, m, off, nxt) != 0) 953 return; 954 } 955 #endif /* IPSEC */ 956 957 nxt = ip6_protox[nxt](&m, &off, nxt); 958 } 959 return; 960 bad: 961 in6_ifstat_inc(rcvif, ifs6_in_discard); 962 if (m != NULL) 963 m_freem(m); 964 } 965 966 /* 967 * Hop-by-Hop options header processing. If a valid jumbo payload option is 968 * included report an error. 969 * 970 * rtalertp - XXX: should be stored more smart way 971 */ 972 static int 973 ip6_hopopts_input(u_int32_t *rtalertp, struct mbuf **mp, int *offp) 974 { 975 struct mbuf *m = *mp; 976 int off = *offp, hbhlen; 977 struct ip6_hbh *hbh; 978 979 /* validation of the length of the header */ 980 if (m->m_len < off + sizeof(*hbh)) { 981 m = m_pullup(m, off + sizeof(*hbh)); 982 if (m == NULL) { 983 IP6STAT_INC(ip6s_exthdrtoolong); 984 *mp = NULL; 985 return (-1); 986 } 987 } 988 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); 989 hbhlen = (hbh->ip6h_len + 1) << 3; 990 991 if (m->m_len < off + hbhlen) { 992 m = m_pullup(m, off + hbhlen); 993 if (m == NULL) { 994 IP6STAT_INC(ip6s_exthdrtoolong); 995 *mp = NULL; 996 return (-1); 997 } 998 } 999 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); 1000 off += hbhlen; 1001 hbhlen -= sizeof(struct ip6_hbh); 1002 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 1003 hbhlen, rtalertp) < 0) { 1004 *mp = NULL; 1005 return (-1); 1006 } 1007 1008 *offp = off; 1009 *mp = m; 1010 return (0); 1011 } 1012 1013 /* 1014 * Search header for all Hop-by-hop options and process each option. 1015 * This function is separate from ip6_hopopts_input() in order to 1016 * handle a case where the sending node itself process its hop-by-hop 1017 * options header. In such a case, the function is called from ip6_output(). 1018 * 1019 * The function assumes that hbh header is located right after the IPv6 header 1020 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to 1021 * opthead + hbhlen is located in contiguous memory region. 1022 */ 1023 int 1024 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen, 1025 u_int32_t *rtalertp) 1026 { 1027 int optlen = 0; 1028 u_int8_t *opt = opthead; 1029 u_int16_t rtalert_val; 1030 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh); 1031 1032 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 1033 switch (*opt) { 1034 case IP6OPT_PAD1: 1035 optlen = 1; 1036 break; 1037 case IP6OPT_PADN: 1038 if (hbhlen < IP6OPT_MINLEN) { 1039 IP6STAT_INC(ip6s_toosmall); 1040 goto bad; 1041 } 1042 optlen = *(opt + 1) + 2; 1043 break; 1044 case IP6OPT_ROUTER_ALERT: 1045 /* XXX may need check for alignment */ 1046 if (hbhlen < IP6OPT_RTALERT_LEN) { 1047 IP6STAT_INC(ip6s_toosmall); 1048 goto bad; 1049 } 1050 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) { 1051 /* XXX stat */ 1052 icmp6_error(m, ICMP6_PARAM_PROB, 1053 ICMP6_PARAMPROB_HEADER, 1054 erroff + opt + 1 - opthead); 1055 return (-1); 1056 } 1057 optlen = IP6OPT_RTALERT_LEN; 1058 bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2); 1059 *rtalertp = ntohs(rtalert_val); 1060 break; 1061 case IP6OPT_JUMBO: 1062 /* We do not support the Jumbo Payload option. */ 1063 goto bad; 1064 default: /* unknown option */ 1065 if (hbhlen < IP6OPT_MINLEN) { 1066 IP6STAT_INC(ip6s_toosmall); 1067 goto bad; 1068 } 1069 optlen = ip6_unknown_opt(opt, m, 1070 erroff + opt - opthead); 1071 if (optlen == -1) 1072 return (-1); 1073 optlen += 2; 1074 break; 1075 } 1076 } 1077 1078 return (0); 1079 1080 bad: 1081 m_freem(m); 1082 return (-1); 1083 } 1084 1085 /* 1086 * Unknown option processing. 1087 * The third argument `off' is the offset from the IPv6 header to the option, 1088 * which is necessary if the IPv6 header the and option header and IPv6 header 1089 * is not contiguous in order to return an ICMPv6 error. 1090 */ 1091 int 1092 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off) 1093 { 1094 struct ip6_hdr *ip6; 1095 1096 switch (IP6OPT_TYPE(*optp)) { 1097 case IP6OPT_TYPE_SKIP: /* ignore the option */ 1098 return ((int)*(optp + 1)); 1099 case IP6OPT_TYPE_DISCARD: /* silently discard */ 1100 m_freem(m); 1101 return (-1); 1102 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 1103 IP6STAT_INC(ip6s_badoptions); 1104 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 1105 return (-1); 1106 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 1107 IP6STAT_INC(ip6s_badoptions); 1108 ip6 = mtod(m, struct ip6_hdr *); 1109 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 1110 (m->m_flags & (M_BCAST|M_MCAST))) 1111 m_freem(m); 1112 else 1113 icmp6_error(m, ICMP6_PARAM_PROB, 1114 ICMP6_PARAMPROB_OPTION, off); 1115 return (-1); 1116 } 1117 1118 m_freem(m); /* XXX: NOTREACHED */ 1119 return (-1); 1120 } 1121 1122 /* 1123 * Create the "control" list for this pcb. 1124 * These functions will not modify mbuf chain at all. 1125 * 1126 * The routine will be called from upper layer handlers like tcp6_input(). 1127 * Thus the routine assumes that the caller (tcp6_input) have already 1128 * called m_pullup() and all the extension headers are located in the 1129 * very first mbuf on the mbuf chain. 1130 * 1131 * ip6_savecontrol_v4 will handle those options that are possible to be 1132 * set on a v4-mapped socket. 1133 * ip6_savecontrol will directly call ip6_savecontrol_v4 to handle those 1134 * options and handle the v6-only ones itself. 1135 */ 1136 struct mbuf ** 1137 ip6_savecontrol_v4(struct inpcb *inp, struct mbuf *m, struct mbuf **mp, 1138 int *v4only) 1139 { 1140 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1141 1142 #if defined(SO_TIMESTAMP) && defined(SO_BINTIME) 1143 if ((inp->inp_socket->so_options & (SO_TIMESTAMP | SO_BINTIME)) != 0) { 1144 union { 1145 struct timeval tv; 1146 struct bintime bt; 1147 struct timespec ts; 1148 } t; 1149 struct bintime boottimebin, bt1; 1150 struct timespec ts1; 1151 int ts_clock; 1152 bool stamped; 1153 1154 ts_clock = inp->inp_socket->so_ts_clock; 1155 stamped = false; 1156 1157 /* 1158 * Handle BINTIME first. We create the same output options 1159 * for both SO_BINTIME and the case where SO_TIMESTAMP is 1160 * set with the timestamp clock set to SO_TS_BINTIME. 1161 */ 1162 if ((inp->inp_socket->so_options & SO_BINTIME) != 0 || 1163 ts_clock == SO_TS_BINTIME) { 1164 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1165 M_TSTMP)) { 1166 mbuf_tstmp2timespec(m, &ts1); 1167 timespec2bintime(&ts1, &t.bt); 1168 getboottimebin(&boottimebin); 1169 bintime_add(&t.bt, &boottimebin); 1170 } else { 1171 bintime(&t.bt); 1172 } 1173 *mp = sbcreatecontrol(&t.bt, sizeof(t.bt), SCM_BINTIME, 1174 SOL_SOCKET, M_NOWAIT); 1175 if (*mp != NULL) { 1176 mp = &(*mp)->m_next; 1177 stamped = true; 1178 } 1179 1180 /* 1181 * Suppress other timestamps if SO_TIMESTAMP is not 1182 * set. 1183 */ 1184 if ((inp->inp_socket->so_options & SO_TIMESTAMP) == 0) 1185 ts_clock = SO_TS_BINTIME; 1186 } 1187 1188 switch (ts_clock) { 1189 case SO_TS_REALTIME_MICRO: 1190 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1191 M_TSTMP)) { 1192 mbuf_tstmp2timespec(m, &ts1); 1193 timespec2bintime(&ts1, &bt1); 1194 getboottimebin(&boottimebin); 1195 bintime_add(&bt1, &boottimebin); 1196 bintime2timeval(&bt1, &t.tv); 1197 } else { 1198 microtime(&t.tv); 1199 } 1200 *mp = sbcreatecontrol(&t.tv, sizeof(t.tv), 1201 SCM_TIMESTAMP, SOL_SOCKET, M_NOWAIT); 1202 if (*mp != NULL) { 1203 mp = &(*mp)->m_next; 1204 stamped = true; 1205 } 1206 break; 1207 1208 case SO_TS_BINTIME: 1209 break; 1210 1211 case SO_TS_REALTIME: 1212 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1213 M_TSTMP)) { 1214 mbuf_tstmp2timespec(m, &t.ts); 1215 getboottimebin(&boottimebin); 1216 bintime2timespec(&boottimebin, &ts1); 1217 timespecadd(&t.ts, &ts1, &t.ts); 1218 } else { 1219 nanotime(&t.ts); 1220 } 1221 *mp = sbcreatecontrol(&t.ts, sizeof(t.ts), 1222 SCM_REALTIME, SOL_SOCKET, M_NOWAIT); 1223 if (*mp != NULL) { 1224 mp = &(*mp)->m_next; 1225 stamped = true; 1226 } 1227 break; 1228 1229 case SO_TS_MONOTONIC: 1230 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1231 M_TSTMP)) 1232 mbuf_tstmp2timespec(m, &t.ts); 1233 else 1234 nanouptime(&t.ts); 1235 *mp = sbcreatecontrol(&t.ts, sizeof(t.ts), 1236 SCM_MONOTONIC, SOL_SOCKET, M_NOWAIT); 1237 if (*mp != NULL) { 1238 mp = &(*mp)->m_next; 1239 stamped = true; 1240 } 1241 break; 1242 1243 default: 1244 panic("unknown (corrupted) so_ts_clock"); 1245 } 1246 if (stamped && (m->m_flags & (M_PKTHDR | M_TSTMP)) == 1247 (M_PKTHDR | M_TSTMP)) { 1248 struct sock_timestamp_info sti; 1249 1250 bzero(&sti, sizeof(sti)); 1251 sti.st_info_flags = ST_INFO_HW; 1252 if ((m->m_flags & M_TSTMP_HPREC) != 0) 1253 sti.st_info_flags |= ST_INFO_HW_HPREC; 1254 *mp = sbcreatecontrol(&sti, sizeof(sti), SCM_TIME_INFO, 1255 SOL_SOCKET, M_NOWAIT); 1256 if (*mp != NULL) 1257 mp = &(*mp)->m_next; 1258 } 1259 } 1260 #endif 1261 1262 #define IS2292(inp, x, y) (((inp)->inp_flags & IN6P_RFC2292) ? (x) : (y)) 1263 /* RFC 2292 sec. 5 */ 1264 if ((inp->inp_flags & IN6P_PKTINFO) != 0) { 1265 struct in6_pktinfo pi6; 1266 1267 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1268 #ifdef INET 1269 struct ip *ip; 1270 1271 ip = mtod(m, struct ip *); 1272 pi6.ipi6_addr.s6_addr32[0] = 0; 1273 pi6.ipi6_addr.s6_addr32[1] = 0; 1274 pi6.ipi6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP; 1275 pi6.ipi6_addr.s6_addr32[3] = ip->ip_dst.s_addr; 1276 #else 1277 /* We won't hit this code */ 1278 bzero(&pi6.ipi6_addr, sizeof(struct in6_addr)); 1279 #endif 1280 } else { 1281 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr)); 1282 in6_clearscope(&pi6.ipi6_addr); /* XXX */ 1283 } 1284 pi6.ipi6_ifindex = 1285 (m && m->m_pkthdr.rcvif) ? m->m_pkthdr.rcvif->if_index : 0; 1286 1287 *mp = sbcreatecontrol(&pi6, sizeof(struct in6_pktinfo), 1288 IS2292(inp, IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6, 1289 M_NOWAIT); 1290 if (*mp) 1291 mp = &(*mp)->m_next; 1292 } 1293 1294 if ((inp->inp_flags & IN6P_HOPLIMIT) != 0) { 1295 int hlim; 1296 1297 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1298 #ifdef INET 1299 struct ip *ip; 1300 1301 ip = mtod(m, struct ip *); 1302 hlim = ip->ip_ttl; 1303 #else 1304 /* We won't hit this code */ 1305 hlim = 0; 1306 #endif 1307 } else { 1308 hlim = ip6->ip6_hlim & 0xff; 1309 } 1310 *mp = sbcreatecontrol(&hlim, sizeof(int), 1311 IS2292(inp, IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), 1312 IPPROTO_IPV6, M_NOWAIT); 1313 if (*mp) 1314 mp = &(*mp)->m_next; 1315 } 1316 1317 if ((inp->inp_flags & IN6P_TCLASS) != 0) { 1318 int tclass; 1319 1320 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1321 #ifdef INET 1322 struct ip *ip; 1323 1324 ip = mtod(m, struct ip *); 1325 tclass = ip->ip_tos; 1326 #else 1327 /* We won't hit this code */ 1328 tclass = 0; 1329 #endif 1330 } else { 1331 u_int32_t flowinfo; 1332 1333 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK); 1334 flowinfo >>= 20; 1335 tclass = flowinfo & 0xff; 1336 } 1337 *mp = sbcreatecontrol(&tclass, sizeof(int), IPV6_TCLASS, 1338 IPPROTO_IPV6, M_NOWAIT); 1339 if (*mp) 1340 mp = &(*mp)->m_next; 1341 } 1342 1343 if (v4only != NULL) { 1344 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1345 *v4only = 1; 1346 } else { 1347 *v4only = 0; 1348 } 1349 } 1350 1351 return (mp); 1352 } 1353 1354 void 1355 ip6_savecontrol(struct inpcb *inp, struct mbuf *m, struct mbuf **mp) 1356 { 1357 struct ip6_hdr *ip6; 1358 int v4only = 0; 1359 1360 mp = ip6_savecontrol_v4(inp, m, mp, &v4only); 1361 if (v4only) 1362 return; 1363 1364 ip6 = mtod(m, struct ip6_hdr *); 1365 /* 1366 * IPV6_HOPOPTS socket option. Recall that we required super-user 1367 * privilege for the option (see ip6_ctloutput), but it might be too 1368 * strict, since there might be some hop-by-hop options which can be 1369 * returned to normal user. 1370 * See also RFC 2292 section 6 (or RFC 3542 section 8). 1371 */ 1372 if ((inp->inp_flags & IN6P_HOPOPTS) != 0) { 1373 /* 1374 * Check if a hop-by-hop options header is contatined in the 1375 * received packet, and if so, store the options as ancillary 1376 * data. Note that a hop-by-hop options header must be 1377 * just after the IPv6 header, which is assured through the 1378 * IPv6 input processing. 1379 */ 1380 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 1381 struct ip6_hbh *hbh; 1382 u_int hbhlen; 1383 1384 hbh = (struct ip6_hbh *)(ip6 + 1); 1385 hbhlen = (hbh->ip6h_len + 1) << 3; 1386 1387 /* 1388 * XXX: We copy the whole header even if a 1389 * jumbo payload option is included, the option which 1390 * is to be removed before returning according to 1391 * RFC2292. 1392 * Note: this constraint is removed in RFC3542 1393 */ 1394 *mp = sbcreatecontrol(hbh, hbhlen, 1395 IS2292(inp, IPV6_2292HOPOPTS, IPV6_HOPOPTS), 1396 IPPROTO_IPV6, M_NOWAIT); 1397 if (*mp) 1398 mp = &(*mp)->m_next; 1399 } 1400 } 1401 1402 if ((inp->inp_flags & (IN6P_RTHDR | IN6P_DSTOPTS)) != 0) { 1403 int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr); 1404 1405 /* 1406 * Search for destination options headers or routing 1407 * header(s) through the header chain, and stores each 1408 * header as ancillary data. 1409 * Note that the order of the headers remains in 1410 * the chain of ancillary data. 1411 */ 1412 while (1) { /* is explicit loop prevention necessary? */ 1413 struct ip6_ext *ip6e = NULL; 1414 u_int elen; 1415 1416 /* 1417 * if it is not an extension header, don't try to 1418 * pull it from the chain. 1419 */ 1420 switch (nxt) { 1421 case IPPROTO_DSTOPTS: 1422 case IPPROTO_ROUTING: 1423 case IPPROTO_HOPOPTS: 1424 case IPPROTO_AH: /* is it possible? */ 1425 break; 1426 default: 1427 goto loopend; 1428 } 1429 1430 if (off + sizeof(*ip6e) > m->m_len) 1431 goto loopend; 1432 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off); 1433 if (nxt == IPPROTO_AH) 1434 elen = (ip6e->ip6e_len + 2) << 2; 1435 else 1436 elen = (ip6e->ip6e_len + 1) << 3; 1437 if (off + elen > m->m_len) 1438 goto loopend; 1439 1440 switch (nxt) { 1441 case IPPROTO_DSTOPTS: 1442 if (!(inp->inp_flags & IN6P_DSTOPTS)) 1443 break; 1444 1445 *mp = sbcreatecontrol(ip6e, elen, 1446 IS2292(inp, IPV6_2292DSTOPTS, IPV6_DSTOPTS), 1447 IPPROTO_IPV6, M_NOWAIT); 1448 if (*mp) 1449 mp = &(*mp)->m_next; 1450 break; 1451 case IPPROTO_ROUTING: 1452 if (!(inp->inp_flags & IN6P_RTHDR)) 1453 break; 1454 1455 *mp = sbcreatecontrol(ip6e, elen, 1456 IS2292(inp, IPV6_2292RTHDR, IPV6_RTHDR), 1457 IPPROTO_IPV6, M_NOWAIT); 1458 if (*mp) 1459 mp = &(*mp)->m_next; 1460 break; 1461 case IPPROTO_HOPOPTS: 1462 case IPPROTO_AH: /* is it possible? */ 1463 break; 1464 1465 default: 1466 /* 1467 * other cases have been filtered in the above. 1468 * none will visit this case. here we supply 1469 * the code just in case (nxt overwritten or 1470 * other cases). 1471 */ 1472 goto loopend; 1473 } 1474 1475 /* proceed with the next header. */ 1476 off += elen; 1477 nxt = ip6e->ip6e_nxt; 1478 ip6e = NULL; 1479 } 1480 loopend: 1481 ; 1482 } 1483 1484 if (inp->inp_flags2 & INP_RECVFLOWID) { 1485 uint32_t flowid, flow_type; 1486 1487 flowid = m->m_pkthdr.flowid; 1488 flow_type = M_HASHTYPE_GET(m); 1489 1490 /* 1491 * XXX should handle the failure of one or the 1492 * other - don't populate both? 1493 */ 1494 *mp = sbcreatecontrol(&flowid, sizeof(uint32_t), IPV6_FLOWID, 1495 IPPROTO_IPV6, M_NOWAIT); 1496 if (*mp) 1497 mp = &(*mp)->m_next; 1498 *mp = sbcreatecontrol(&flow_type, sizeof(uint32_t), 1499 IPV6_FLOWTYPE, IPPROTO_IPV6, M_NOWAIT); 1500 if (*mp) 1501 mp = &(*mp)->m_next; 1502 } 1503 1504 #ifdef RSS 1505 if (inp->inp_flags2 & INP_RECVRSSBUCKETID) { 1506 uint32_t flowid, flow_type; 1507 uint32_t rss_bucketid; 1508 1509 flowid = m->m_pkthdr.flowid; 1510 flow_type = M_HASHTYPE_GET(m); 1511 1512 if (rss_hash2bucket(flowid, flow_type, &rss_bucketid) == 0) { 1513 *mp = sbcreatecontrol(&rss_bucketid, sizeof(uint32_t), 1514 IPV6_RSSBUCKETID, IPPROTO_IPV6, M_NOWAIT); 1515 if (*mp) 1516 mp = &(*mp)->m_next; 1517 } 1518 } 1519 #endif 1520 1521 } 1522 #undef IS2292 1523 1524 void 1525 ip6_notify_pmtu(struct inpcb *inp, struct sockaddr_in6 *dst, u_int32_t mtu) 1526 { 1527 struct socket *so; 1528 struct mbuf *m_mtu; 1529 struct ip6_mtuinfo mtuctl; 1530 1531 KASSERT(inp != NULL, ("%s: inp == NULL", __func__)); 1532 /* 1533 * Notify the error by sending IPV6_PATHMTU ancillary data if 1534 * application wanted to know the MTU value. 1535 * NOTE: we notify disconnected sockets, because some udp 1536 * applications keep sending sockets disconnected. 1537 * NOTE: our implementation doesn't notify connected sockets that has 1538 * foreign address that is different than given destination addresses 1539 * (this is permitted by RFC 3542). 1540 */ 1541 if ((inp->inp_flags & IN6P_MTU) == 0 || ( 1542 !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 1543 !IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &dst->sin6_addr))) 1544 return; 1545 1546 mtuctl.ip6m_mtu = mtu; 1547 mtuctl.ip6m_addr = *dst; 1548 if (sa6_recoverscope(&mtuctl.ip6m_addr)) 1549 return; 1550 1551 if ((m_mtu = sbcreatecontrol(&mtuctl, sizeof(mtuctl), IPV6_PATHMTU, 1552 IPPROTO_IPV6, M_NOWAIT)) == NULL) 1553 return; 1554 1555 so = inp->inp_socket; 1556 if (sbappendaddr(&so->so_rcv, (struct sockaddr *)dst, NULL, m_mtu) 1557 == 0) { 1558 soroverflow(so); 1559 m_freem(m_mtu); 1560 /* XXX: should count statistics */ 1561 } else 1562 sorwakeup(so); 1563 } 1564 1565 /* 1566 * Get pointer to the previous header followed by the header 1567 * currently processed. 1568 */ 1569 int 1570 ip6_get_prevhdr(const struct mbuf *m, int off) 1571 { 1572 struct ip6_ext ip6e; 1573 struct ip6_hdr *ip6; 1574 int len, nlen, nxt; 1575 1576 if (off == sizeof(struct ip6_hdr)) 1577 return (offsetof(struct ip6_hdr, ip6_nxt)); 1578 if (off < sizeof(struct ip6_hdr)) 1579 panic("%s: off < sizeof(struct ip6_hdr)", __func__); 1580 1581 ip6 = mtod(m, struct ip6_hdr *); 1582 nxt = ip6->ip6_nxt; 1583 len = sizeof(struct ip6_hdr); 1584 nlen = 0; 1585 while (len < off) { 1586 m_copydata(m, len, sizeof(ip6e), (caddr_t)&ip6e); 1587 switch (nxt) { 1588 case IPPROTO_FRAGMENT: 1589 nlen = sizeof(struct ip6_frag); 1590 break; 1591 case IPPROTO_AH: 1592 nlen = (ip6e.ip6e_len + 2) << 2; 1593 break; 1594 default: 1595 nlen = (ip6e.ip6e_len + 1) << 3; 1596 } 1597 len += nlen; 1598 nxt = ip6e.ip6e_nxt; 1599 } 1600 return (len - nlen); 1601 } 1602 1603 /* 1604 * get next header offset. m will be retained. 1605 */ 1606 int 1607 ip6_nexthdr(const struct mbuf *m, int off, int proto, int *nxtp) 1608 { 1609 struct ip6_hdr ip6; 1610 struct ip6_ext ip6e; 1611 struct ip6_frag fh; 1612 1613 /* just in case */ 1614 if (m == NULL) 1615 panic("ip6_nexthdr: m == NULL"); 1616 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off) 1617 return -1; 1618 1619 switch (proto) { 1620 case IPPROTO_IPV6: 1621 if (m->m_pkthdr.len < off + sizeof(ip6)) 1622 return -1; 1623 m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6); 1624 if (nxtp) 1625 *nxtp = ip6.ip6_nxt; 1626 off += sizeof(ip6); 1627 return off; 1628 1629 case IPPROTO_FRAGMENT: 1630 /* 1631 * terminate parsing if it is not the first fragment, 1632 * it does not make sense to parse through it. 1633 */ 1634 if (m->m_pkthdr.len < off + sizeof(fh)) 1635 return -1; 1636 m_copydata(m, off, sizeof(fh), (caddr_t)&fh); 1637 /* IP6F_OFF_MASK = 0xfff8(BigEndian), 0xf8ff(LittleEndian) */ 1638 if (fh.ip6f_offlg & IP6F_OFF_MASK) 1639 return -1; 1640 if (nxtp) 1641 *nxtp = fh.ip6f_nxt; 1642 off += sizeof(struct ip6_frag); 1643 return off; 1644 1645 case IPPROTO_AH: 1646 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1647 return -1; 1648 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1649 if (nxtp) 1650 *nxtp = ip6e.ip6e_nxt; 1651 off += (ip6e.ip6e_len + 2) << 2; 1652 return off; 1653 1654 case IPPROTO_HOPOPTS: 1655 case IPPROTO_ROUTING: 1656 case IPPROTO_DSTOPTS: 1657 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1658 return -1; 1659 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1660 if (nxtp) 1661 *nxtp = ip6e.ip6e_nxt; 1662 off += (ip6e.ip6e_len + 1) << 3; 1663 return off; 1664 1665 case IPPROTO_NONE: 1666 case IPPROTO_ESP: 1667 case IPPROTO_IPCOMP: 1668 /* give up */ 1669 return -1; 1670 1671 default: 1672 return -1; 1673 } 1674 1675 /* NOTREACHED */ 1676 } 1677 1678 /* 1679 * get offset for the last header in the chain. m will be kept untainted. 1680 */ 1681 int 1682 ip6_lasthdr(const struct mbuf *m, int off, int proto, int *nxtp) 1683 { 1684 int newoff; 1685 int nxt; 1686 1687 if (!nxtp) { 1688 nxt = -1; 1689 nxtp = &nxt; 1690 } 1691 while (1) { 1692 newoff = ip6_nexthdr(m, off, proto, nxtp); 1693 if (newoff < 0) 1694 return off; 1695 else if (newoff < off) 1696 return -1; /* invalid */ 1697 else if (newoff == off) 1698 return newoff; 1699 1700 off = newoff; 1701 proto = *nxtp; 1702 } 1703 } 1704