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_rss.h" 67 #include "opt_sctp.h" 68 69 #include <sys/param.h> 70 #include <sys/systm.h> 71 #include <sys/hhook.h> 72 #include <sys/malloc.h> 73 #include <sys/mbuf.h> 74 #include <sys/proc.h> 75 #include <sys/domain.h> 76 #include <sys/protosw.h> 77 #include <sys/sdt.h> 78 #include <sys/socket.h> 79 #include <sys/socketvar.h> 80 #include <sys/errno.h> 81 #include <sys/time.h> 82 #include <sys/kernel.h> 83 #include <sys/lock.h> 84 #include <sys/rmlock.h> 85 #include <sys/syslog.h> 86 #include <sys/sysctl.h> 87 #include <sys/eventhandler.h> 88 89 #include <net/if.h> 90 #include <net/if_var.h> 91 #include <net/if_types.h> 92 #include <net/if_private.h> 93 #include <net/if_dl.h> 94 #include <net/route.h> 95 #include <net/netisr.h> 96 #include <net/rss_config.h> 97 #include <net/pfil.h> 98 #include <net/vnet.h> 99 100 #include <netinet/in.h> 101 #include <netinet/in_kdtrace.h> 102 #include <netinet/ip_var.h> 103 #include <netinet/in_systm.h> 104 #include <net/if_llatbl.h> 105 #ifdef INET 106 #include <netinet/ip.h> 107 #include <netinet/ip_icmp.h> 108 #endif /* INET */ 109 #include <netinet/ip6.h> 110 #include <netinet6/in6_var.h> 111 #include <netinet6/ip6_var.h> 112 #include <netinet/ip_encap.h> 113 #include <netinet/in_pcb.h> 114 #include <netinet/icmp6.h> 115 #include <netinet6/scope6_var.h> 116 #include <netinet6/in6_ifattach.h> 117 #include <netinet6/mld6_var.h> 118 #include <netinet6/nd6.h> 119 #include <netinet6/in6_rss.h> 120 #include <netinet6/ip6_mroute.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 /* 686 * Try to forward the packet, but if we fail continue. 687 * ip6_tryforward() does not generate redirects, so fall 688 * through to normal processing if redirects are required. 689 * ip6_tryforward() does inbound and outbound packet firewall 690 * processing. If firewall has decided that destination becomes 691 * our local address, it sets M_FASTFWD_OURS flag. In this 692 * case skip another inbound firewall processing and update 693 * ip6 pointer. 694 */ 695 if (V_ip6_forwarding != 0 && V_ip6_sendredirects == 0 696 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 697 && (!IPSEC_ENABLED(ipv6) || 698 IPSEC_CAPS(ipv6, m, IPSEC_CAP_OPERABLE) == 0) 699 #endif 700 ) { 701 if ((m = ip6_tryforward(m)) == NULL) 702 return; 703 if (m->m_flags & M_FASTFWD_OURS) { 704 ip6 = mtod(m, struct ip6_hdr *); 705 goto passin; 706 } 707 } 708 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 709 /* 710 * Bypass packet filtering for packets previously handled by IPsec. 711 */ 712 if (IPSEC_ENABLED(ipv6) && 713 IPSEC_CAPS(ipv6, m, IPSEC_CAP_BYPASS_FILTER) != 0) 714 goto passin; 715 #endif 716 /* 717 * Run through list of hooks for input packets. 718 * 719 * NB: Beware of the destination address changing 720 * (e.g. by NAT rewriting). When this happens, 721 * tell ip6_forward to do the right thing. 722 */ 723 724 /* Jump over all PFIL processing if hooks are not active. */ 725 if (!PFIL_HOOKED_IN(V_inet6_pfil_head)) 726 goto passin; 727 728 odst = ip6->ip6_dst; 729 if (pfil_mbuf_in(V_inet6_pfil_head, &m, m->m_pkthdr.rcvif, 730 NULL) != PFIL_PASS) 731 return; 732 ip6 = mtod(m, struct ip6_hdr *); 733 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst); 734 if ((m->m_flags & (M_IP6_NEXTHOP | M_FASTFWD_OURS)) == M_IP6_NEXTHOP && 735 m_tag_find(m, PACKET_TAG_IPFORWARD, NULL) != NULL) { 736 /* 737 * Directly ship the packet on. This allows forwarding 738 * packets originally destined to us to some other directly 739 * connected host. 740 */ 741 ip6_forward(m, 1); 742 return; 743 } 744 745 passin: 746 /* 747 * The check is deferred to here to give firewalls a chance to block 748 * (and log) such packets. ip6_tryforward() will not process such 749 * packets. 750 */ 751 if (__predict_false(IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst))) { 752 IP6STAT_INC(ip6s_badscope); 753 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 754 goto bad; 755 } 756 757 plen = (uint32_t)ntohs(ip6->ip6_plen); 758 759 /* 760 * We don't support Jumbograms, reject packets with plen == 0 as early 761 * as we can. 762 */ 763 if (plen == 0) 764 goto bad; 765 766 /* 767 * Disambiguate address scope zones (if there is ambiguity). 768 * We first make sure that the original source or destination address 769 * is not in our internal form for scoped addresses. Such addresses 770 * are not necessarily invalid spec-wise, but we cannot accept them due 771 * to the usage conflict. 772 * in6_setscope() then also checks and rejects the cases where src or 773 * dst are the loopback address and the receiving interface 774 * is not loopback. 775 */ 776 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) { 777 IP6STAT_INC(ip6s_badscope); /* XXX */ 778 goto bad; 779 } 780 if (in6_setscope(&ip6->ip6_src, rcvif, NULL) || 781 in6_setscope(&ip6->ip6_dst, rcvif, NULL)) { 782 IP6STAT_INC(ip6s_badscope); 783 goto bad; 784 } 785 if (m->m_flags & M_FASTFWD_OURS) { 786 m->m_flags &= ~M_FASTFWD_OURS; 787 ours = 1; 788 goto hbhcheck; 789 } 790 /* 791 * Multicast check. Assume packet is for us to avoid 792 * prematurely taking locks. 793 */ 794 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 795 ours = 1; 796 in6_ifstat_inc(rcvif, ifs6_in_mcast); 797 goto hbhcheck; 798 } 799 /* 800 * Unicast check 801 * XXX: For now we keep link-local IPv6 addresses with embedded 802 * scope zone id, therefore we use zero zoneid here. 803 */ 804 ia = in6ifa_ifwithaddr(&ip6->ip6_dst, 0 /* XXX */, false); 805 if (ia != NULL) { 806 if (ia->ia6_flags & IN6_IFF_NOTREADY) { 807 char ip6bufs[INET6_ADDRSTRLEN]; 808 char ip6bufd[INET6_ADDRSTRLEN]; 809 /* address is not ready, so discard the packet. */ 810 nd6log((LOG_INFO, 811 "ip6_input: packet to an unready address %s->%s\n", 812 ip6_sprintf(ip6bufs, &ip6->ip6_src), 813 ip6_sprintf(ip6bufd, &ip6->ip6_dst))); 814 goto bad; 815 } 816 if (V_ip6_sav && !(m->m_flags & M_LOOP) && 817 __predict_false(in6_localip_fib(&ip6->ip6_src, 818 rcvif->if_fib))) { 819 IP6STAT_INC(ip6s_badscope); /* XXX */ 820 goto bad; 821 } 822 /* Count the packet in the ip address stats */ 823 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1); 824 counter_u64_add(ia->ia_ifa.ifa_ibytes, m->m_pkthdr.len); 825 ours = 1; 826 goto hbhcheck; 827 } 828 829 /* 830 * Now there is no reason to process the packet if it's not our own 831 * and we're not a router. 832 */ 833 if (!V_ip6_forwarding) { 834 IP6STAT_INC(ip6s_cantforward); 835 goto bad; 836 } 837 838 hbhcheck: 839 /* 840 * Process Hop-by-Hop options header if it's contained. 841 * m may be modified in ip6_hopopts_input(). 842 */ 843 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 844 if (ip6_input_hbh(&m, &rtalert, &off, &nxt, &ours) != 0) 845 return; 846 } else 847 nxt = ip6->ip6_nxt; 848 849 /* 850 * Use mbuf flags to propagate Router Alert option to 851 * ICMPv6 layer, as hop-by-hop options have been stripped. 852 */ 853 if (rtalert != ~0) 854 m->m_flags |= M_RTALERT_MLD; 855 856 /* 857 * Check that the amount of data in the buffers 858 * is as at least much as the IPv6 header would have us expect. 859 * Trim mbufs if longer than we expect. 860 * Drop packet if shorter than we expect. 861 */ 862 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 863 IP6STAT_INC(ip6s_tooshort); 864 in6_ifstat_inc(rcvif, ifs6_in_truncated); 865 goto bad; 866 } 867 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 868 if (m->m_len == m->m_pkthdr.len) { 869 m->m_len = sizeof(struct ip6_hdr) + plen; 870 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 871 } else 872 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 873 } 874 875 /* 876 * Forward if desirable. 877 */ 878 if (V_ip6_mrouting_enabled && 879 IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 880 /* 881 * If we are acting as a multicast router, all 882 * incoming multicast packets are passed to the 883 * kernel-level multicast forwarding function. 884 * The packet is returned (relatively) intact; if 885 * ip6_mforward() returns a non-zero value, the packet 886 * must be discarded, else it may be accepted below. 887 * 888 * XXX TODO: Check hlim and multicast scope here to avoid 889 * unnecessarily calling into ip6_mforward(). 890 */ 891 if (ip6_mforward && ip6_mforward(ip6, rcvif, m)) { 892 IP6STAT_INC(ip6s_cantforward); 893 goto bad; 894 } 895 } else if (!ours) { 896 ip6_forward(m, srcrt); 897 return; 898 } 899 900 /* 901 * We are going to ship the packet to the local protocol stack. Call the 902 * filter again for this 'output' action, allowing redirect-like rules 903 * to adjust the source address. 904 */ 905 if (PFIL_HOOKED_OUT(V_inet6_local_pfil_head)) { 906 if (pfil_mbuf_out(V_inet6_local_pfil_head, &m, V_loif, NULL) != 907 PFIL_PASS) 908 return; 909 ip6 = mtod(m, struct ip6_hdr *); 910 } 911 912 /* 913 * Tell launch routine the next header 914 */ 915 IP6STAT_INC(ip6s_delivered); 916 in6_ifstat_inc(rcvif, ifs6_in_deliver); 917 nest = 0; 918 919 while (nxt != IPPROTO_DONE) { 920 if (V_ip6_hdrnestlimit && (++nest > V_ip6_hdrnestlimit)) { 921 IP6STAT_INC(ip6s_toomanyhdr); 922 goto bad; 923 } 924 925 /* 926 * protection against faulty packet - there should be 927 * more sanity checks in header chain processing. 928 */ 929 if (m->m_pkthdr.len < off) { 930 IP6STAT_INC(ip6s_tooshort); 931 in6_ifstat_inc(rcvif, ifs6_in_truncated); 932 goto bad; 933 } 934 935 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 936 if (IPSEC_ENABLED(ipv6)) { 937 if (IPSEC_INPUT(ipv6, m, off, nxt) != 0) 938 return; 939 } 940 #endif /* IPSEC */ 941 942 nxt = ip6_protox[nxt](&m, &off, nxt); 943 } 944 return; 945 bad: 946 in6_ifstat_inc(rcvif, ifs6_in_discard); 947 if (m != NULL) 948 m_freem(m); 949 } 950 951 /* 952 * Hop-by-Hop options header processing. If a valid jumbo payload option is 953 * included report an error. 954 * 955 * rtalertp - XXX: should be stored more smart way 956 */ 957 static int 958 ip6_hopopts_input(u_int32_t *rtalertp, struct mbuf **mp, int *offp) 959 { 960 struct mbuf *m = *mp; 961 int off = *offp, hbhlen; 962 struct ip6_hbh *hbh; 963 964 /* validation of the length of the header */ 965 if (m->m_len < off + sizeof(*hbh)) { 966 m = m_pullup(m, off + sizeof(*hbh)); 967 if (m == NULL) { 968 IP6STAT_INC(ip6s_exthdrtoolong); 969 *mp = NULL; 970 return (-1); 971 } 972 } 973 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); 974 hbhlen = (hbh->ip6h_len + 1) << 3; 975 976 if (m->m_len < off + hbhlen) { 977 m = m_pullup(m, off + hbhlen); 978 if (m == NULL) { 979 IP6STAT_INC(ip6s_exthdrtoolong); 980 *mp = NULL; 981 return (-1); 982 } 983 } 984 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); 985 off += hbhlen; 986 hbhlen -= sizeof(struct ip6_hbh); 987 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 988 hbhlen, rtalertp) < 0) { 989 *mp = NULL; 990 return (-1); 991 } 992 993 *offp = off; 994 *mp = m; 995 return (0); 996 } 997 998 /* 999 * Search header for all Hop-by-hop options and process each option. 1000 * This function is separate from ip6_hopopts_input() in order to 1001 * handle a case where the sending node itself process its hop-by-hop 1002 * options header. In such a case, the function is called from ip6_output(). 1003 * 1004 * The function assumes that hbh header is located right after the IPv6 header 1005 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to 1006 * opthead + hbhlen is located in contiguous memory region. 1007 */ 1008 int 1009 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen, 1010 u_int32_t *rtalertp) 1011 { 1012 int optlen = 0; 1013 u_int8_t *opt = opthead; 1014 u_int16_t rtalert_val; 1015 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh); 1016 1017 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 1018 switch (*opt) { 1019 case IP6OPT_PAD1: 1020 optlen = 1; 1021 break; 1022 case IP6OPT_PADN: 1023 if (hbhlen < IP6OPT_MINLEN) { 1024 IP6STAT_INC(ip6s_toosmall); 1025 goto bad; 1026 } 1027 optlen = *(opt + 1) + 2; 1028 break; 1029 case IP6OPT_ROUTER_ALERT: 1030 /* XXX may need check for alignment */ 1031 if (hbhlen < IP6OPT_RTALERT_LEN) { 1032 IP6STAT_INC(ip6s_toosmall); 1033 goto bad; 1034 } 1035 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) { 1036 /* XXX stat */ 1037 icmp6_error(m, ICMP6_PARAM_PROB, 1038 ICMP6_PARAMPROB_HEADER, 1039 erroff + opt + 1 - opthead); 1040 return (-1); 1041 } 1042 optlen = IP6OPT_RTALERT_LEN; 1043 bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2); 1044 *rtalertp = ntohs(rtalert_val); 1045 break; 1046 case IP6OPT_JUMBO: 1047 /* We do not support the Jumbo Payload option. */ 1048 goto bad; 1049 default: /* unknown option */ 1050 if (hbhlen < IP6OPT_MINLEN) { 1051 IP6STAT_INC(ip6s_toosmall); 1052 goto bad; 1053 } 1054 optlen = ip6_unknown_opt(opt, m, 1055 erroff + opt - opthead); 1056 if (optlen == -1) 1057 return (-1); 1058 optlen += 2; 1059 break; 1060 } 1061 } 1062 1063 return (0); 1064 1065 bad: 1066 m_freem(m); 1067 return (-1); 1068 } 1069 1070 /* 1071 * Unknown option processing. 1072 * The third argument `off' is the offset from the IPv6 header to the option, 1073 * which is necessary if the IPv6 header the and option header and IPv6 header 1074 * is not contiguous in order to return an ICMPv6 error. 1075 */ 1076 int 1077 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off) 1078 { 1079 struct ip6_hdr *ip6; 1080 1081 switch (IP6OPT_TYPE(*optp)) { 1082 case IP6OPT_TYPE_SKIP: /* ignore the option */ 1083 return ((int)*(optp + 1)); 1084 case IP6OPT_TYPE_DISCARD: /* silently discard */ 1085 m_freem(m); 1086 return (-1); 1087 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 1088 IP6STAT_INC(ip6s_badoptions); 1089 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 1090 return (-1); 1091 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 1092 IP6STAT_INC(ip6s_badoptions); 1093 ip6 = mtod(m, struct ip6_hdr *); 1094 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 1095 (m->m_flags & (M_BCAST|M_MCAST))) 1096 m_freem(m); 1097 else 1098 icmp6_error(m, ICMP6_PARAM_PROB, 1099 ICMP6_PARAMPROB_OPTION, off); 1100 return (-1); 1101 } 1102 1103 m_freem(m); /* XXX: NOTREACHED */ 1104 return (-1); 1105 } 1106 1107 /* 1108 * Create the "control" list for this pcb. 1109 * These functions will not modify mbuf chain at all. 1110 * 1111 * The routine will be called from upper layer handlers like tcp6_input(). 1112 * Thus the routine assumes that the caller (tcp6_input) have already 1113 * called m_pullup() and all the extension headers are located in the 1114 * very first mbuf on the mbuf chain. 1115 * 1116 * ip6_savecontrol_v4 will handle those options that are possible to be 1117 * set on a v4-mapped socket. 1118 * ip6_savecontrol will directly call ip6_savecontrol_v4 to handle those 1119 * options and handle the v6-only ones itself. 1120 */ 1121 struct mbuf ** 1122 ip6_savecontrol_v4(struct inpcb *inp, struct mbuf *m, struct mbuf **mp, 1123 int *v4only) 1124 { 1125 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1126 1127 #if defined(SO_TIMESTAMP) && defined(SO_BINTIME) 1128 if ((inp->inp_socket->so_options & (SO_TIMESTAMP | SO_BINTIME)) != 0) { 1129 union { 1130 struct timeval tv; 1131 struct bintime bt; 1132 struct timespec ts; 1133 } t; 1134 struct bintime boottimebin, bt1; 1135 struct timespec ts1; 1136 int ts_clock; 1137 bool stamped; 1138 1139 ts_clock = inp->inp_socket->so_ts_clock; 1140 stamped = false; 1141 1142 /* 1143 * Handle BINTIME first. We create the same output options 1144 * for both SO_BINTIME and the case where SO_TIMESTAMP is 1145 * set with the timestamp clock set to SO_TS_BINTIME. 1146 */ 1147 if ((inp->inp_socket->so_options & SO_BINTIME) != 0 || 1148 ts_clock == SO_TS_BINTIME) { 1149 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1150 M_TSTMP)) { 1151 mbuf_tstmp2timespec(m, &ts1); 1152 timespec2bintime(&ts1, &t.bt); 1153 getboottimebin(&boottimebin); 1154 bintime_add(&t.bt, &boottimebin); 1155 } else { 1156 bintime(&t.bt); 1157 } 1158 *mp = sbcreatecontrol(&t.bt, sizeof(t.bt), SCM_BINTIME, 1159 SOL_SOCKET, M_NOWAIT); 1160 if (*mp != NULL) { 1161 mp = &(*mp)->m_next; 1162 stamped = true; 1163 } 1164 1165 /* 1166 * Suppress other timestamps if SO_TIMESTAMP is not 1167 * set. 1168 */ 1169 if ((inp->inp_socket->so_options & SO_TIMESTAMP) == 0) 1170 ts_clock = SO_TS_BINTIME; 1171 } 1172 1173 switch (ts_clock) { 1174 case SO_TS_REALTIME_MICRO: 1175 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1176 M_TSTMP)) { 1177 mbuf_tstmp2timespec(m, &ts1); 1178 timespec2bintime(&ts1, &bt1); 1179 getboottimebin(&boottimebin); 1180 bintime_add(&bt1, &boottimebin); 1181 bintime2timeval(&bt1, &t.tv); 1182 } else { 1183 microtime(&t.tv); 1184 } 1185 *mp = sbcreatecontrol(&t.tv, sizeof(t.tv), 1186 SCM_TIMESTAMP, SOL_SOCKET, M_NOWAIT); 1187 if (*mp != NULL) { 1188 mp = &(*mp)->m_next; 1189 stamped = true; 1190 } 1191 break; 1192 1193 case SO_TS_BINTIME: 1194 break; 1195 1196 case SO_TS_REALTIME: 1197 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1198 M_TSTMP)) { 1199 mbuf_tstmp2timespec(m, &t.ts); 1200 getboottimebin(&boottimebin); 1201 bintime2timespec(&boottimebin, &ts1); 1202 timespecadd(&t.ts, &ts1, &t.ts); 1203 } else { 1204 nanotime(&t.ts); 1205 } 1206 *mp = sbcreatecontrol(&t.ts, sizeof(t.ts), 1207 SCM_REALTIME, SOL_SOCKET, M_NOWAIT); 1208 if (*mp != NULL) { 1209 mp = &(*mp)->m_next; 1210 stamped = true; 1211 } 1212 break; 1213 1214 case SO_TS_MONOTONIC: 1215 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1216 M_TSTMP)) 1217 mbuf_tstmp2timespec(m, &t.ts); 1218 else 1219 nanouptime(&t.ts); 1220 *mp = sbcreatecontrol(&t.ts, sizeof(t.ts), 1221 SCM_MONOTONIC, SOL_SOCKET, M_NOWAIT); 1222 if (*mp != NULL) { 1223 mp = &(*mp)->m_next; 1224 stamped = true; 1225 } 1226 break; 1227 1228 default: 1229 panic("unknown (corrupted) so_ts_clock"); 1230 } 1231 if (stamped && (m->m_flags & (M_PKTHDR | M_TSTMP)) == 1232 (M_PKTHDR | M_TSTMP)) { 1233 struct sock_timestamp_info sti; 1234 1235 bzero(&sti, sizeof(sti)); 1236 sti.st_info_flags = ST_INFO_HW; 1237 if ((m->m_flags & M_TSTMP_HPREC) != 0) 1238 sti.st_info_flags |= ST_INFO_HW_HPREC; 1239 *mp = sbcreatecontrol(&sti, sizeof(sti), SCM_TIME_INFO, 1240 SOL_SOCKET, M_NOWAIT); 1241 if (*mp != NULL) 1242 mp = &(*mp)->m_next; 1243 } 1244 } 1245 #endif 1246 1247 #define IS2292(inp, x, y) (((inp)->inp_flags & IN6P_RFC2292) ? (x) : (y)) 1248 /* RFC 2292 sec. 5 */ 1249 if ((inp->inp_flags & IN6P_PKTINFO) != 0) { 1250 struct in6_pktinfo pi6; 1251 1252 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1253 #ifdef INET 1254 struct ip *ip; 1255 1256 ip = mtod(m, struct ip *); 1257 pi6.ipi6_addr.s6_addr32[0] = 0; 1258 pi6.ipi6_addr.s6_addr32[1] = 0; 1259 pi6.ipi6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP; 1260 pi6.ipi6_addr.s6_addr32[3] = ip->ip_dst.s_addr; 1261 #else 1262 /* We won't hit this code */ 1263 bzero(&pi6.ipi6_addr, sizeof(struct in6_addr)); 1264 #endif 1265 } else { 1266 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr)); 1267 in6_clearscope(&pi6.ipi6_addr); /* XXX */ 1268 } 1269 pi6.ipi6_ifindex = 1270 (m && m->m_pkthdr.rcvif) ? m->m_pkthdr.rcvif->if_index : 0; 1271 1272 *mp = sbcreatecontrol(&pi6, sizeof(struct in6_pktinfo), 1273 IS2292(inp, IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6, 1274 M_NOWAIT); 1275 if (*mp) 1276 mp = &(*mp)->m_next; 1277 } 1278 1279 if ((inp->inp_flags & IN6P_HOPLIMIT) != 0) { 1280 int hlim; 1281 1282 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1283 #ifdef INET 1284 struct ip *ip; 1285 1286 ip = mtod(m, struct ip *); 1287 hlim = ip->ip_ttl; 1288 #else 1289 /* We won't hit this code */ 1290 hlim = 0; 1291 #endif 1292 } else { 1293 hlim = ip6->ip6_hlim & 0xff; 1294 } 1295 *mp = sbcreatecontrol(&hlim, sizeof(int), 1296 IS2292(inp, IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), 1297 IPPROTO_IPV6, M_NOWAIT); 1298 if (*mp) 1299 mp = &(*mp)->m_next; 1300 } 1301 1302 if ((inp->inp_flags & IN6P_TCLASS) != 0) { 1303 int tclass; 1304 1305 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1306 #ifdef INET 1307 struct ip *ip; 1308 1309 ip = mtod(m, struct ip *); 1310 tclass = ip->ip_tos; 1311 #else 1312 /* We won't hit this code */ 1313 tclass = 0; 1314 #endif 1315 } else { 1316 u_int32_t flowinfo; 1317 1318 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK); 1319 flowinfo >>= 20; 1320 tclass = flowinfo & 0xff; 1321 } 1322 *mp = sbcreatecontrol(&tclass, sizeof(int), IPV6_TCLASS, 1323 IPPROTO_IPV6, M_NOWAIT); 1324 if (*mp) 1325 mp = &(*mp)->m_next; 1326 } 1327 1328 if (v4only != NULL) { 1329 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1330 *v4only = 1; 1331 } else { 1332 *v4only = 0; 1333 } 1334 } 1335 1336 return (mp); 1337 } 1338 1339 void 1340 ip6_savecontrol(struct inpcb *inp, struct mbuf *m, struct mbuf **mp) 1341 { 1342 struct ip6_hdr *ip6; 1343 int v4only = 0; 1344 1345 mp = ip6_savecontrol_v4(inp, m, mp, &v4only); 1346 if (v4only) 1347 return; 1348 1349 ip6 = mtod(m, struct ip6_hdr *); 1350 /* 1351 * IPV6_HOPOPTS socket option. Recall that we required super-user 1352 * privilege for the option (see ip6_ctloutput), but it might be too 1353 * strict, since there might be some hop-by-hop options which can be 1354 * returned to normal user. 1355 * See also RFC 2292 section 6 (or RFC 3542 section 8). 1356 */ 1357 if ((inp->inp_flags & IN6P_HOPOPTS) != 0) { 1358 /* 1359 * Check if a hop-by-hop options header is contatined in the 1360 * received packet, and if so, store the options as ancillary 1361 * data. Note that a hop-by-hop options header must be 1362 * just after the IPv6 header, which is assured through the 1363 * IPv6 input processing. 1364 */ 1365 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 1366 struct ip6_hbh *hbh; 1367 u_int hbhlen; 1368 1369 hbh = (struct ip6_hbh *)(ip6 + 1); 1370 hbhlen = (hbh->ip6h_len + 1) << 3; 1371 1372 /* 1373 * XXX: We copy the whole header even if a 1374 * jumbo payload option is included, the option which 1375 * is to be removed before returning according to 1376 * RFC2292. 1377 * Note: this constraint is removed in RFC3542 1378 */ 1379 *mp = sbcreatecontrol(hbh, hbhlen, 1380 IS2292(inp, IPV6_2292HOPOPTS, IPV6_HOPOPTS), 1381 IPPROTO_IPV6, M_NOWAIT); 1382 if (*mp) 1383 mp = &(*mp)->m_next; 1384 } 1385 } 1386 1387 if ((inp->inp_flags & (IN6P_RTHDR | IN6P_DSTOPTS)) != 0) { 1388 int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr); 1389 1390 /* 1391 * Search for destination options headers or routing 1392 * header(s) through the header chain, and stores each 1393 * header as ancillary data. 1394 * Note that the order of the headers remains in 1395 * the chain of ancillary data. 1396 */ 1397 while (1) { /* is explicit loop prevention necessary? */ 1398 struct ip6_ext *ip6e = NULL; 1399 u_int elen; 1400 1401 /* 1402 * if it is not an extension header, don't try to 1403 * pull it from the chain. 1404 */ 1405 switch (nxt) { 1406 case IPPROTO_DSTOPTS: 1407 case IPPROTO_ROUTING: 1408 case IPPROTO_HOPOPTS: 1409 case IPPROTO_AH: /* is it possible? */ 1410 break; 1411 default: 1412 goto loopend; 1413 } 1414 1415 if (off + sizeof(*ip6e) > m->m_len) 1416 goto loopend; 1417 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off); 1418 if (nxt == IPPROTO_AH) 1419 elen = (ip6e->ip6e_len + 2) << 2; 1420 else 1421 elen = (ip6e->ip6e_len + 1) << 3; 1422 if (off + elen > m->m_len) 1423 goto loopend; 1424 1425 switch (nxt) { 1426 case IPPROTO_DSTOPTS: 1427 if (!(inp->inp_flags & IN6P_DSTOPTS)) 1428 break; 1429 1430 *mp = sbcreatecontrol(ip6e, elen, 1431 IS2292(inp, IPV6_2292DSTOPTS, IPV6_DSTOPTS), 1432 IPPROTO_IPV6, M_NOWAIT); 1433 if (*mp) 1434 mp = &(*mp)->m_next; 1435 break; 1436 case IPPROTO_ROUTING: 1437 if (!(inp->inp_flags & IN6P_RTHDR)) 1438 break; 1439 1440 *mp = sbcreatecontrol(ip6e, elen, 1441 IS2292(inp, IPV6_2292RTHDR, IPV6_RTHDR), 1442 IPPROTO_IPV6, M_NOWAIT); 1443 if (*mp) 1444 mp = &(*mp)->m_next; 1445 break; 1446 case IPPROTO_HOPOPTS: 1447 case IPPROTO_AH: /* is it possible? */ 1448 break; 1449 1450 default: 1451 /* 1452 * other cases have been filtered in the above. 1453 * none will visit this case. here we supply 1454 * the code just in case (nxt overwritten or 1455 * other cases). 1456 */ 1457 goto loopend; 1458 } 1459 1460 /* proceed with the next header. */ 1461 off += elen; 1462 nxt = ip6e->ip6e_nxt; 1463 ip6e = NULL; 1464 } 1465 loopend: 1466 ; 1467 } 1468 1469 if (inp->inp_flags2 & INP_RECVFLOWID) { 1470 uint32_t flowid, flow_type; 1471 1472 flowid = m->m_pkthdr.flowid; 1473 flow_type = M_HASHTYPE_GET(m); 1474 1475 /* 1476 * XXX should handle the failure of one or the 1477 * other - don't populate both? 1478 */ 1479 *mp = sbcreatecontrol(&flowid, sizeof(uint32_t), IPV6_FLOWID, 1480 IPPROTO_IPV6, M_NOWAIT); 1481 if (*mp) 1482 mp = &(*mp)->m_next; 1483 *mp = sbcreatecontrol(&flow_type, sizeof(uint32_t), 1484 IPV6_FLOWTYPE, IPPROTO_IPV6, M_NOWAIT); 1485 if (*mp) 1486 mp = &(*mp)->m_next; 1487 } 1488 1489 #ifdef RSS 1490 if (inp->inp_flags2 & INP_RECVRSSBUCKETID) { 1491 uint32_t flowid, flow_type; 1492 uint32_t rss_bucketid; 1493 1494 flowid = m->m_pkthdr.flowid; 1495 flow_type = M_HASHTYPE_GET(m); 1496 1497 if (rss_hash2bucket(flowid, flow_type, &rss_bucketid) == 0) { 1498 *mp = sbcreatecontrol(&rss_bucketid, sizeof(uint32_t), 1499 IPV6_RSSBUCKETID, IPPROTO_IPV6, M_NOWAIT); 1500 if (*mp) 1501 mp = &(*mp)->m_next; 1502 } 1503 } 1504 #endif 1505 1506 } 1507 #undef IS2292 1508 1509 void 1510 ip6_notify_pmtu(struct inpcb *inp, struct sockaddr_in6 *dst, u_int32_t mtu) 1511 { 1512 struct socket *so; 1513 struct mbuf *m_mtu; 1514 struct ip6_mtuinfo mtuctl; 1515 1516 KASSERT(inp != NULL, ("%s: inp == NULL", __func__)); 1517 /* 1518 * Notify the error by sending IPV6_PATHMTU ancillary data if 1519 * application wanted to know the MTU value. 1520 * NOTE: we notify disconnected sockets, because some udp 1521 * applications keep sending sockets disconnected. 1522 * NOTE: our implementation doesn't notify connected sockets that has 1523 * foreign address that is different than given destination addresses 1524 * (this is permitted by RFC 3542). 1525 */ 1526 if ((inp->inp_flags & IN6P_MTU) == 0 || ( 1527 !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 1528 !IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &dst->sin6_addr))) 1529 return; 1530 1531 mtuctl.ip6m_mtu = mtu; 1532 mtuctl.ip6m_addr = *dst; 1533 if (sa6_recoverscope(&mtuctl.ip6m_addr)) 1534 return; 1535 1536 if ((m_mtu = sbcreatecontrol(&mtuctl, sizeof(mtuctl), IPV6_PATHMTU, 1537 IPPROTO_IPV6, M_NOWAIT)) == NULL) 1538 return; 1539 1540 so = inp->inp_socket; 1541 if (sbappendaddr(&so->so_rcv, (struct sockaddr *)dst, NULL, m_mtu) 1542 == 0) { 1543 soroverflow(so); 1544 m_freem(m_mtu); 1545 /* XXX: should count statistics */ 1546 } else 1547 sorwakeup(so); 1548 } 1549 1550 /* 1551 * Get pointer to the previous header followed by the header 1552 * currently processed. 1553 */ 1554 int 1555 ip6_get_prevhdr(const struct mbuf *m, int off) 1556 { 1557 struct ip6_ext ip6e; 1558 struct ip6_hdr *ip6; 1559 int len, nlen, nxt; 1560 1561 if (off == sizeof(struct ip6_hdr)) 1562 return (offsetof(struct ip6_hdr, ip6_nxt)); 1563 if (off < sizeof(struct ip6_hdr)) 1564 panic("%s: off < sizeof(struct ip6_hdr)", __func__); 1565 1566 ip6 = mtod(m, struct ip6_hdr *); 1567 nxt = ip6->ip6_nxt; 1568 len = sizeof(struct ip6_hdr); 1569 nlen = 0; 1570 while (len < off) { 1571 m_copydata(m, len, sizeof(ip6e), (caddr_t)&ip6e); 1572 switch (nxt) { 1573 case IPPROTO_FRAGMENT: 1574 nlen = sizeof(struct ip6_frag); 1575 break; 1576 case IPPROTO_AH: 1577 nlen = (ip6e.ip6e_len + 2) << 2; 1578 break; 1579 default: 1580 nlen = (ip6e.ip6e_len + 1) << 3; 1581 } 1582 len += nlen; 1583 nxt = ip6e.ip6e_nxt; 1584 } 1585 return (len - nlen); 1586 } 1587 1588 /* 1589 * get next header offset. m will be retained. 1590 */ 1591 int 1592 ip6_nexthdr(const struct mbuf *m, int off, int proto, int *nxtp) 1593 { 1594 struct ip6_hdr ip6; 1595 struct ip6_ext ip6e; 1596 struct ip6_frag fh; 1597 1598 /* just in case */ 1599 if (m == NULL) 1600 panic("ip6_nexthdr: m == NULL"); 1601 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off) 1602 return -1; 1603 1604 switch (proto) { 1605 case IPPROTO_IPV6: 1606 if (m->m_pkthdr.len < off + sizeof(ip6)) 1607 return -1; 1608 m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6); 1609 if (nxtp) 1610 *nxtp = ip6.ip6_nxt; 1611 off += sizeof(ip6); 1612 return off; 1613 1614 case IPPROTO_FRAGMENT: 1615 /* 1616 * terminate parsing if it is not the first fragment, 1617 * it does not make sense to parse through it. 1618 */ 1619 if (m->m_pkthdr.len < off + sizeof(fh)) 1620 return -1; 1621 m_copydata(m, off, sizeof(fh), (caddr_t)&fh); 1622 /* IP6F_OFF_MASK = 0xfff8(BigEndian), 0xf8ff(LittleEndian) */ 1623 if (fh.ip6f_offlg & IP6F_OFF_MASK) 1624 return -1; 1625 if (nxtp) 1626 *nxtp = fh.ip6f_nxt; 1627 off += sizeof(struct ip6_frag); 1628 return off; 1629 1630 case IPPROTO_AH: 1631 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1632 return -1; 1633 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1634 if (nxtp) 1635 *nxtp = ip6e.ip6e_nxt; 1636 off += (ip6e.ip6e_len + 2) << 2; 1637 return off; 1638 1639 case IPPROTO_HOPOPTS: 1640 case IPPROTO_ROUTING: 1641 case IPPROTO_DSTOPTS: 1642 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1643 return -1; 1644 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1645 if (nxtp) 1646 *nxtp = ip6e.ip6e_nxt; 1647 off += (ip6e.ip6e_len + 1) << 3; 1648 return off; 1649 1650 case IPPROTO_NONE: 1651 case IPPROTO_ESP: 1652 case IPPROTO_IPCOMP: 1653 /* give up */ 1654 return -1; 1655 1656 default: 1657 return -1; 1658 } 1659 1660 /* NOTREACHED */ 1661 } 1662 1663 /* 1664 * get offset for the last header in the chain. m will be kept untainted. 1665 */ 1666 int 1667 ip6_lasthdr(const struct mbuf *m, int off, int proto, int *nxtp) 1668 { 1669 int newoff; 1670 int nxt; 1671 1672 if (!nxtp) { 1673 nxt = -1; 1674 nxtp = &nxt; 1675 } 1676 while (1) { 1677 newoff = ip6_nexthdr(m, off, proto, nxtp); 1678 if (newoff < 0) 1679 return off; 1680 else if (newoff < off) 1681 return -1; /* invalid */ 1682 else if (newoff == off) 1683 return newoff; 1684 1685 off = newoff; 1686 proto = *nxtp; 1687 } 1688 } 1689