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 m = *mp; 425 ip6 = mtod(m, struct ip6_hdr *); 426 427 /* ip6_hopopts_input() ensures that mbuf is contiguous */ 428 hbh = (struct ip6_hbh *)(ip6 + 1); 429 *nxt = hbh->ip6h_nxt; 430 431 /* 432 * If we are acting as a router and the packet contains a 433 * router alert option, see if we know the option value. 434 * Currently, we only support the option value for MLD, in which 435 * case we should pass the packet to the multicast routing 436 * daemon. 437 */ 438 if (*rtalert != ~0) { 439 switch (*rtalert) { 440 case IP6OPT_RTALERT_MLD: 441 if (V_ip6_forwarding) 442 *ours = 1; 443 break; 444 default: 445 /* 446 * RFC2711 requires unrecognized values must be 447 * silently ignored. 448 */ 449 break; 450 } 451 } 452 453 return (0); 454 455 out: 456 return (1); 457 } 458 459 #ifdef RSS 460 /* 461 * IPv6 direct input routine. 462 * 463 * This is called when reinjecting completed fragments where 464 * all of the previous checking and book-keeping has been done. 465 */ 466 void 467 ip6_direct_input(struct mbuf *m) 468 { 469 int off, nxt; 470 int nest; 471 struct m_tag *mtag; 472 struct ip6_direct_ctx *ip6dc; 473 474 mtag = m_tag_locate(m, MTAG_ABI_IPV6, IPV6_TAG_DIRECT, NULL); 475 KASSERT(mtag != NULL, ("Reinjected packet w/o direct ctx tag!")); 476 477 ip6dc = (struct ip6_direct_ctx *)(mtag + 1); 478 nxt = ip6dc->ip6dc_nxt; 479 off = ip6dc->ip6dc_off; 480 481 nest = 0; 482 483 m_tag_delete(m, mtag); 484 485 while (nxt != IPPROTO_DONE) { 486 if (V_ip6_hdrnestlimit && (++nest > V_ip6_hdrnestlimit)) { 487 IP6STAT_INC(ip6s_toomanyhdr); 488 goto bad; 489 } 490 491 /* 492 * protection against faulty packet - there should be 493 * more sanity checks in header chain processing. 494 */ 495 if (m->m_pkthdr.len < off) { 496 IP6STAT_INC(ip6s_tooshort); 497 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 498 goto bad; 499 } 500 501 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 502 if (IPSEC_ENABLED(ipv6)) { 503 if (IPSEC_INPUT(ipv6, m, off, nxt) != 0) 504 return; 505 } 506 #endif /* IPSEC */ 507 508 nxt = ip6_protox[nxt](&m, &off, nxt); 509 } 510 return; 511 bad: 512 m_freem(m); 513 } 514 #endif 515 516 void 517 ip6_input(struct mbuf *m) 518 { 519 struct in6_addr odst; 520 struct ip6_hdr *ip6; 521 struct in6_ifaddr *ia; 522 struct ifnet *rcvif; 523 u_int32_t plen; 524 u_int32_t rtalert = ~0; 525 int off = sizeof(struct ip6_hdr), nest; 526 int nxt, ours = 0; 527 int srcrt = 0; 528 529 /* 530 * Drop the packet if IPv6 operation is disabled on the interface. 531 */ 532 rcvif = m->m_pkthdr.rcvif; 533 if ((rcvif->if_inet6->nd_flags & ND6_IFF_IFDISABLED)) 534 goto bad; 535 536 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 537 /* 538 * should the inner packet be considered authentic? 539 * see comment in ah4_input(). 540 * NB: m cannot be NULL when passed to the input routine 541 */ 542 543 m->m_flags &= ~M_AUTHIPHDR; 544 m->m_flags &= ~M_AUTHIPDGM; 545 546 #endif /* IPSEC */ 547 548 if (m->m_flags & M_FASTFWD_OURS) { 549 /* 550 * Firewall changed destination to local. 551 */ 552 ip6 = mtod(m, struct ip6_hdr *); 553 goto passin; 554 } 555 556 /* 557 * mbuf statistics 558 */ 559 if (m->m_flags & M_EXT) { 560 if (m->m_next) 561 IP6STAT_INC(ip6s_mext2m); 562 else 563 IP6STAT_INC(ip6s_mext1); 564 } else { 565 if (m->m_next) { 566 struct ifnet *ifp = (m->m_flags & M_LOOP) ? V_loif : rcvif; 567 int ifindex = ifp->if_index; 568 if (ifindex >= IP6S_M2MMAX) 569 ifindex = 0; 570 IP6STAT_INC2(ip6s_m2m, ifindex); 571 } else 572 IP6STAT_INC(ip6s_m1); 573 } 574 575 in6_ifstat_inc(rcvif, ifs6_in_receive); 576 IP6STAT_INC(ip6s_total); 577 578 /* 579 * L2 bridge code and some other code can return mbuf chain 580 * that does not conform to KAME requirement. too bad. 581 * XXX: fails to join if interface MTU > MCLBYTES. jumbogram? 582 */ 583 if (m && m->m_next != NULL && m->m_pkthdr.len < MCLBYTES) { 584 struct mbuf *n; 585 586 if (m->m_pkthdr.len > MHLEN) 587 n = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 588 else 589 n = m_gethdr(M_NOWAIT, MT_DATA); 590 if (n == NULL) 591 goto bad; 592 593 m_move_pkthdr(n, m); 594 m_copydata(m, 0, n->m_pkthdr.len, mtod(n, caddr_t)); 595 n->m_len = n->m_pkthdr.len; 596 m_freem(m); 597 m = n; 598 } 599 if (m->m_len < sizeof(struct ip6_hdr)) { 600 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 601 IP6STAT_INC(ip6s_toosmall); 602 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 603 goto bad; 604 } 605 } 606 607 ip6 = mtod(m, struct ip6_hdr *); 608 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 609 IP6STAT_INC(ip6s_badvers); 610 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 611 goto bad; 612 } 613 614 IP6STAT_INC2(ip6s_nxthist, ip6->ip6_nxt); 615 IP_PROBE(receive, NULL, NULL, ip6, rcvif, NULL, ip6); 616 617 /* 618 * Check against address spoofing/corruption. The unspecified address 619 * is checked further below. 620 */ 621 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) { 622 /* 623 * XXX: "badscope" is not very suitable for a multicast source. 624 */ 625 IP6STAT_INC(ip6s_badscope); 626 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 627 goto bad; 628 } 629 if (IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) && 630 !(m->m_flags & M_LOOP)) { 631 /* 632 * In this case, the packet should come from the loopback 633 * interface. However, we cannot just check the if_flags, 634 * because ip6_mloopback() passes the "actual" interface 635 * as the outgoing/incoming interface. 636 */ 637 IP6STAT_INC(ip6s_badscope); 638 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 639 goto bad; 640 } 641 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && 642 IPV6_ADDR_MC_SCOPE(&ip6->ip6_dst) == 0) { 643 /* 644 * RFC4291 2.7: 645 * Nodes must not originate a packet to a multicast address 646 * whose scop field contains the reserved value 0; if such 647 * a packet is received, it must be silently dropped. 648 */ 649 IP6STAT_INC(ip6s_badscope); 650 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 651 goto bad; 652 } 653 /* 654 * The following check is not documented in specs. A malicious 655 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack 656 * and bypass security checks (act as if it was from 127.0.0.1 by using 657 * IPv6 src ::ffff:127.0.0.1). Be cautious. 658 * 659 * We have supported IPv6-only kernels for a few years and this issue 660 * has not come up. The world seems to move mostly towards not using 661 * v4mapped on the wire, so it makes sense for us to keep rejecting 662 * any such packets. 663 */ 664 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 665 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 666 IP6STAT_INC(ip6s_badscope); 667 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 668 goto bad; 669 } 670 /* 671 * Try to forward the packet, but if we fail continue. 672 * ip6_tryforward() does not generate redirects, so fall 673 * through to normal processing if redirects are required. 674 * ip6_tryforward() does inbound and outbound packet firewall 675 * processing. If firewall has decided that destination becomes 676 * our local address, it sets M_FASTFWD_OURS flag. In this 677 * case skip another inbound firewall processing and update 678 * ip6 pointer. 679 */ 680 if (V_ip6_forwarding != 0 && V_ip6_sendredirects == 0 681 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 682 && (!IPSEC_ENABLED(ipv6) || 683 IPSEC_CAPS(ipv6, m, IPSEC_CAP_OPERABLE) == 0) 684 #endif 685 ) { 686 if ((m = ip6_tryforward(m)) == NULL) 687 return; 688 if (m->m_flags & M_FASTFWD_OURS) { 689 ip6 = mtod(m, struct ip6_hdr *); 690 goto passin; 691 } 692 } 693 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 694 /* 695 * Bypass packet filtering for packets previously handled by IPsec. 696 */ 697 if (IPSEC_ENABLED(ipv6) && 698 IPSEC_CAPS(ipv6, m, IPSEC_CAP_BYPASS_FILTER) != 0) 699 goto passin; 700 #endif 701 /* 702 * Run through list of hooks for input packets. 703 * 704 * NB: Beware of the destination address changing 705 * (e.g. by NAT rewriting). When this happens, 706 * tell ip6_forward to do the right thing. 707 */ 708 709 /* Jump over all PFIL processing if hooks are not active. */ 710 if (!PFIL_HOOKED_IN(V_inet6_pfil_head)) 711 goto passin; 712 713 odst = ip6->ip6_dst; 714 if (pfil_mbuf_in(V_inet6_pfil_head, &m, m->m_pkthdr.rcvif, 715 NULL) != PFIL_PASS) 716 return; 717 ip6 = mtod(m, struct ip6_hdr *); 718 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst); 719 if ((m->m_flags & (M_IP6_NEXTHOP | M_FASTFWD_OURS)) == M_IP6_NEXTHOP && 720 m_tag_find(m, PACKET_TAG_IPFORWARD, NULL) != NULL) { 721 /* 722 * Directly ship the packet on. This allows forwarding 723 * packets originally destined to us to some other directly 724 * connected host. 725 */ 726 ip6_forward(m, 1); 727 return; 728 } 729 730 passin: 731 /* 732 * The check is deferred to here to give firewalls a chance to block 733 * (and log) such packets. ip6_tryforward() will not process such 734 * packets. 735 */ 736 if (__predict_false(IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst))) { 737 IP6STAT_INC(ip6s_badscope); 738 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 739 goto bad; 740 } 741 742 plen = (uint32_t)ntohs(ip6->ip6_plen); 743 744 /* 745 * We don't support Jumbograms, reject packets with plen == 0 as early 746 * as we can. 747 */ 748 if (__predict_false(plen == 0)) { 749 IP6STAT_INC(ip6s_tooshort); 750 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 751 goto bad; 752 } 753 754 /* 755 * Disambiguate address scope zones (if there is ambiguity). 756 * We first make sure that the original source or destination address 757 * is not in our internal form for scoped addresses. Such addresses 758 * are not necessarily invalid spec-wise, but we cannot accept them due 759 * to the usage conflict. 760 * in6_setscope() then also checks and rejects the cases where src or 761 * dst are the loopback address and the receiving interface 762 * is not loopback. 763 */ 764 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) { 765 IP6STAT_INC(ip6s_badscope); /* XXX */ 766 goto bad; 767 } 768 if (in6_setscope(&ip6->ip6_src, rcvif, NULL) || 769 in6_setscope(&ip6->ip6_dst, rcvif, NULL)) { 770 IP6STAT_INC(ip6s_badscope); 771 goto bad; 772 } 773 if (m->m_flags & M_FASTFWD_OURS) { 774 m->m_flags &= ~M_FASTFWD_OURS; 775 ours = 1; 776 goto hbhcheck; 777 } 778 /* 779 * Multicast check. Assume packet is for us to avoid 780 * prematurely taking locks. 781 */ 782 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 783 ours = 1; 784 in6_ifstat_inc(rcvif, ifs6_in_mcast); 785 goto hbhcheck; 786 } 787 /* 788 * Unicast check 789 * XXX: For now we keep link-local IPv6 addresses with embedded 790 * scope zone id, therefore we use zero zoneid here. 791 */ 792 ia = in6ifa_ifwithaddr(&ip6->ip6_dst, 0 /* XXX */, false); 793 if (ia != NULL) { 794 if (ia->ia6_flags & IN6_IFF_NOTREADY) { 795 char ip6bufs[INET6_ADDRSTRLEN]; 796 char ip6bufd[INET6_ADDRSTRLEN]; 797 /* address is not ready, so discard the packet. */ 798 nd6log((LOG_INFO, 799 "ip6_input: packet to an unready address %s->%s\n", 800 ip6_sprintf(ip6bufs, &ip6->ip6_src), 801 ip6_sprintf(ip6bufd, &ip6->ip6_dst))); 802 goto bad; 803 } 804 if (V_ip6_sav && !(m->m_flags & M_LOOP) && 805 __predict_false(in6_localip_fib(&ip6->ip6_src, 806 rcvif->if_fib))) { 807 IP6STAT_INC(ip6s_badscope); /* XXX */ 808 goto bad; 809 } 810 /* Count the packet in the ip address stats */ 811 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1); 812 counter_u64_add(ia->ia_ifa.ifa_ibytes, m->m_pkthdr.len); 813 ours = 1; 814 goto hbhcheck; 815 } 816 817 /* 818 * Now there is no reason to process the packet if it's not our own 819 * and we're not a router. 820 */ 821 if (!V_ip6_forwarding) { 822 IP6STAT_INC(ip6s_cantforward); 823 goto bad; 824 } 825 826 hbhcheck: 827 /* 828 * Process Hop-by-Hop options header if it's contained. 829 * m may be modified in ip6_hopopts_input(). 830 */ 831 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 832 if (ip6_input_hbh(&m, &rtalert, &off, &nxt, &ours) != 0) 833 return; 834 } else 835 nxt = ip6->ip6_nxt; 836 837 /* 838 * Use mbuf flags to propagate Router Alert option to 839 * ICMPv6 layer, as hop-by-hop options have been stripped. 840 */ 841 if (rtalert != ~0) 842 m->m_flags |= M_RTALERT_MLD; 843 844 /* 845 * Check that the amount of data in the buffers 846 * is as at least much as the IPv6 header would have us expect. 847 * Trim mbufs if longer than we expect. 848 * Drop packet if shorter than we expect. 849 */ 850 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 851 IP6STAT_INC(ip6s_tooshort); 852 in6_ifstat_inc(rcvif, ifs6_in_truncated); 853 goto bad; 854 } 855 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 856 if (m->m_len == m->m_pkthdr.len) { 857 m->m_len = sizeof(struct ip6_hdr) + plen; 858 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 859 } else 860 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 861 } 862 863 /* 864 * Forward if desirable. 865 */ 866 if (V_ip6_mrouting_enabled && 867 IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 868 /* 869 * If we are acting as a multicast router, all 870 * incoming multicast packets are passed to the 871 * kernel-level multicast forwarding function. 872 * The packet is returned (relatively) intact; if 873 * ip6_mforward() returns a non-zero value, the packet 874 * must be discarded, else it may be accepted below. 875 * 876 * XXX TODO: Check hlim and multicast scope here to avoid 877 * unnecessarily calling into ip6_mforward(). 878 */ 879 if (ip6_mforward && ip6_mforward(ip6, rcvif, m)) { 880 IP6STAT_INC(ip6s_cantforward); 881 goto bad; 882 } 883 } else if (!ours) { 884 ip6_forward(m, srcrt); 885 return; 886 } 887 888 /* 889 * We are going to ship the packet to the local protocol stack. Call the 890 * filter again for this 'output' action, allowing redirect-like rules 891 * to adjust the source address. 892 */ 893 if (PFIL_HOOKED_OUT(V_inet6_local_pfil_head)) { 894 if (pfil_mbuf_out(V_inet6_local_pfil_head, &m, V_loif, NULL) != 895 PFIL_PASS) 896 return; 897 ip6 = mtod(m, struct ip6_hdr *); 898 } 899 900 /* 901 * Tell launch routine the next header 902 */ 903 IP6STAT_INC(ip6s_delivered); 904 in6_ifstat_inc(rcvif, ifs6_in_deliver); 905 nest = 0; 906 907 while (nxt != IPPROTO_DONE) { 908 if (V_ip6_hdrnestlimit && (++nest > V_ip6_hdrnestlimit)) { 909 IP6STAT_INC(ip6s_toomanyhdr); 910 goto bad; 911 } 912 913 /* 914 * protection against faulty packet - there should be 915 * more sanity checks in header chain processing. 916 */ 917 if (m->m_pkthdr.len < off) { 918 IP6STAT_INC(ip6s_tooshort); 919 in6_ifstat_inc(rcvif, ifs6_in_truncated); 920 goto bad; 921 } 922 923 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 924 if (IPSEC_ENABLED(ipv6)) { 925 if (IPSEC_INPUT(ipv6, m, off, nxt) != 0) 926 return; 927 } 928 #endif /* IPSEC */ 929 930 nxt = ip6_protox[nxt](&m, &off, nxt); 931 } 932 return; 933 bad: 934 in6_ifstat_inc(rcvif, ifs6_in_discard); 935 if (m != NULL) 936 m_freem(m); 937 } 938 939 /* 940 * Hop-by-Hop options header processing. If a valid jumbo payload option is 941 * included report an error. 942 * 943 * rtalertp - XXX: should be stored more smart way 944 */ 945 static int 946 ip6_hopopts_input(u_int32_t *rtalertp, struct mbuf **mp, int *offp) 947 { 948 struct mbuf *m = *mp; 949 int off = *offp, hbhlen; 950 struct ip6_hbh *hbh; 951 952 /* validation of the length of the header */ 953 if (m->m_len < off + sizeof(*hbh)) { 954 m = m_pullup(m, off + sizeof(*hbh)); 955 if (m == NULL) { 956 IP6STAT_INC(ip6s_exthdrtoolong); 957 *mp = NULL; 958 return (-1); 959 } 960 } 961 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); 962 hbhlen = (hbh->ip6h_len + 1) << 3; 963 964 if (m->m_len < off + hbhlen) { 965 m = m_pullup(m, off + hbhlen); 966 if (m == NULL) { 967 IP6STAT_INC(ip6s_exthdrtoolong); 968 *mp = NULL; 969 return (-1); 970 } 971 } 972 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); 973 off += hbhlen; 974 hbhlen -= sizeof(struct ip6_hbh); 975 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 976 hbhlen, rtalertp) < 0) { 977 *mp = NULL; 978 return (-1); 979 } 980 981 *offp = off; 982 *mp = m; 983 return (0); 984 } 985 986 /* 987 * Search header for all Hop-by-hop options and process each option. 988 * This function is separate from ip6_hopopts_input() in order to 989 * handle a case where the sending node itself process its hop-by-hop 990 * options header. In such a case, the function is called from ip6_output(). 991 * 992 * The function assumes that hbh header is located right after the IPv6 header 993 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to 994 * opthead + hbhlen is located in contiguous memory region. 995 */ 996 int 997 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen, 998 u_int32_t *rtalertp) 999 { 1000 int optlen = 0; 1001 u_int8_t *opt = opthead; 1002 u_int16_t rtalert_val; 1003 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh); 1004 1005 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 1006 switch (*opt) { 1007 case IP6OPT_PAD1: 1008 optlen = 1; 1009 break; 1010 case IP6OPT_PADN: 1011 if (hbhlen < IP6OPT_MINLEN) { 1012 IP6STAT_INC(ip6s_toosmall); 1013 goto bad; 1014 } 1015 optlen = *(opt + 1) + 2; 1016 break; 1017 case IP6OPT_ROUTER_ALERT: 1018 /* XXX may need check for alignment */ 1019 if (hbhlen < IP6OPT_RTALERT_LEN) { 1020 IP6STAT_INC(ip6s_toosmall); 1021 goto bad; 1022 } 1023 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) { 1024 /* XXX stat */ 1025 icmp6_error(m, ICMP6_PARAM_PROB, 1026 ICMP6_PARAMPROB_HEADER, 1027 erroff + opt + 1 - opthead); 1028 return (-1); 1029 } 1030 optlen = IP6OPT_RTALERT_LEN; 1031 bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2); 1032 *rtalertp = ntohs(rtalert_val); 1033 break; 1034 case IP6OPT_JUMBO: 1035 /* We do not support the Jumbo Payload option. */ 1036 goto bad; 1037 default: /* unknown option */ 1038 if (hbhlen < IP6OPT_MINLEN) { 1039 IP6STAT_INC(ip6s_toosmall); 1040 goto bad; 1041 } 1042 optlen = ip6_unknown_opt(opt, m, 1043 erroff + opt - opthead); 1044 if (optlen == -1) 1045 return (-1); 1046 optlen += 2; 1047 break; 1048 } 1049 } 1050 1051 return (0); 1052 1053 bad: 1054 m_freem(m); 1055 return (-1); 1056 } 1057 1058 /* 1059 * Unknown option processing. 1060 * The third argument `off' is the offset from the IPv6 header to the option, 1061 * which is necessary if the IPv6 header the and option header and IPv6 header 1062 * is not contiguous in order to return an ICMPv6 error. 1063 */ 1064 int 1065 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off) 1066 { 1067 struct ip6_hdr *ip6; 1068 1069 switch (IP6OPT_TYPE(*optp)) { 1070 case IP6OPT_TYPE_SKIP: /* ignore the option */ 1071 return ((int)*(optp + 1)); 1072 case IP6OPT_TYPE_DISCARD: /* silently discard */ 1073 m_freem(m); 1074 return (-1); 1075 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 1076 IP6STAT_INC(ip6s_badoptions); 1077 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 1078 return (-1); 1079 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 1080 IP6STAT_INC(ip6s_badoptions); 1081 ip6 = mtod(m, struct ip6_hdr *); 1082 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 1083 (m->m_flags & (M_BCAST|M_MCAST))) 1084 m_freem(m); 1085 else 1086 icmp6_error(m, ICMP6_PARAM_PROB, 1087 ICMP6_PARAMPROB_OPTION, off); 1088 return (-1); 1089 } 1090 1091 m_freem(m); /* XXX: NOTREACHED */ 1092 return (-1); 1093 } 1094 1095 /* 1096 * Create the "control" list for this pcb. 1097 * These functions will not modify mbuf chain at all. 1098 * 1099 * The routine will be called from upper layer handlers like tcp6_input(). 1100 * Thus the routine assumes that the caller (tcp6_input) have already 1101 * called m_pullup() and all the extension headers are located in the 1102 * very first mbuf on the mbuf chain. 1103 * 1104 * ip6_savecontrol_v4 will handle those options that are possible to be 1105 * set on a v4-mapped socket. 1106 * ip6_savecontrol will directly call ip6_savecontrol_v4 to handle those 1107 * options and handle the v6-only ones itself. 1108 */ 1109 struct mbuf ** 1110 ip6_savecontrol_v4(struct inpcb *inp, struct mbuf *m, struct mbuf **mp, 1111 int *v4only) 1112 { 1113 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1114 1115 #if defined(SO_TIMESTAMP) && defined(SO_BINTIME) 1116 if ((inp->inp_socket->so_options & (SO_TIMESTAMP | SO_BINTIME)) != 0) { 1117 union { 1118 struct timeval tv; 1119 struct bintime bt; 1120 struct timespec ts; 1121 } t; 1122 struct bintime boottimebin, bt1; 1123 struct timespec ts1; 1124 int ts_clock; 1125 bool stamped; 1126 1127 ts_clock = inp->inp_socket->so_ts_clock; 1128 stamped = false; 1129 1130 /* 1131 * Handle BINTIME first. We create the same output options 1132 * for both SO_BINTIME and the case where SO_TIMESTAMP is 1133 * set with the timestamp clock set to SO_TS_BINTIME. 1134 */ 1135 if ((inp->inp_socket->so_options & SO_BINTIME) != 0 || 1136 ts_clock == SO_TS_BINTIME) { 1137 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1138 M_TSTMP)) { 1139 mbuf_tstmp2timespec(m, &ts1); 1140 timespec2bintime(&ts1, &t.bt); 1141 getboottimebin(&boottimebin); 1142 bintime_add(&t.bt, &boottimebin); 1143 } else { 1144 bintime(&t.bt); 1145 } 1146 *mp = sbcreatecontrol(&t.bt, sizeof(t.bt), SCM_BINTIME, 1147 SOL_SOCKET, M_NOWAIT); 1148 if (*mp != NULL) { 1149 mp = &(*mp)->m_next; 1150 stamped = true; 1151 } 1152 1153 /* 1154 * Suppress other timestamps if SO_TIMESTAMP is not 1155 * set. 1156 */ 1157 if ((inp->inp_socket->so_options & SO_TIMESTAMP) == 0) 1158 ts_clock = SO_TS_BINTIME; 1159 } 1160 1161 switch (ts_clock) { 1162 case SO_TS_REALTIME_MICRO: 1163 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1164 M_TSTMP)) { 1165 mbuf_tstmp2timespec(m, &ts1); 1166 timespec2bintime(&ts1, &bt1); 1167 getboottimebin(&boottimebin); 1168 bintime_add(&bt1, &boottimebin); 1169 bintime2timeval(&bt1, &t.tv); 1170 } else { 1171 microtime(&t.tv); 1172 } 1173 *mp = sbcreatecontrol(&t.tv, sizeof(t.tv), 1174 SCM_TIMESTAMP, SOL_SOCKET, M_NOWAIT); 1175 if (*mp != NULL) { 1176 mp = &(*mp)->m_next; 1177 stamped = true; 1178 } 1179 break; 1180 1181 case SO_TS_BINTIME: 1182 break; 1183 1184 case SO_TS_REALTIME: 1185 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1186 M_TSTMP)) { 1187 mbuf_tstmp2timespec(m, &t.ts); 1188 getboottimebin(&boottimebin); 1189 bintime2timespec(&boottimebin, &ts1); 1190 timespecadd(&t.ts, &ts1, &t.ts); 1191 } else { 1192 nanotime(&t.ts); 1193 } 1194 *mp = sbcreatecontrol(&t.ts, sizeof(t.ts), 1195 SCM_REALTIME, SOL_SOCKET, M_NOWAIT); 1196 if (*mp != NULL) { 1197 mp = &(*mp)->m_next; 1198 stamped = true; 1199 } 1200 break; 1201 1202 case SO_TS_MONOTONIC: 1203 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1204 M_TSTMP)) 1205 mbuf_tstmp2timespec(m, &t.ts); 1206 else 1207 nanouptime(&t.ts); 1208 *mp = sbcreatecontrol(&t.ts, sizeof(t.ts), 1209 SCM_MONOTONIC, SOL_SOCKET, M_NOWAIT); 1210 if (*mp != NULL) { 1211 mp = &(*mp)->m_next; 1212 stamped = true; 1213 } 1214 break; 1215 1216 default: 1217 panic("unknown (corrupted) so_ts_clock"); 1218 } 1219 if (stamped && (m->m_flags & (M_PKTHDR | M_TSTMP)) == 1220 (M_PKTHDR | M_TSTMP)) { 1221 struct sock_timestamp_info sti; 1222 1223 bzero(&sti, sizeof(sti)); 1224 sti.st_info_flags = ST_INFO_HW; 1225 if ((m->m_flags & M_TSTMP_HPREC) != 0) 1226 sti.st_info_flags |= ST_INFO_HW_HPREC; 1227 *mp = sbcreatecontrol(&sti, sizeof(sti), SCM_TIME_INFO, 1228 SOL_SOCKET, M_NOWAIT); 1229 if (*mp != NULL) 1230 mp = &(*mp)->m_next; 1231 } 1232 } 1233 #endif 1234 1235 #define IS2292(inp, x, y) (((inp)->inp_flags & IN6P_RFC2292) ? (x) : (y)) 1236 /* RFC 2292 sec. 5 */ 1237 if ((inp->inp_flags & IN6P_PKTINFO) != 0) { 1238 struct in6_pktinfo pi6; 1239 1240 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1241 #ifdef INET 1242 struct ip *ip; 1243 1244 ip = mtod(m, struct ip *); 1245 pi6.ipi6_addr.s6_addr32[0] = 0; 1246 pi6.ipi6_addr.s6_addr32[1] = 0; 1247 pi6.ipi6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP; 1248 pi6.ipi6_addr.s6_addr32[3] = ip->ip_dst.s_addr; 1249 #else 1250 /* We won't hit this code */ 1251 bzero(&pi6.ipi6_addr, sizeof(struct in6_addr)); 1252 #endif 1253 } else { 1254 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr)); 1255 in6_clearscope(&pi6.ipi6_addr); /* XXX */ 1256 } 1257 pi6.ipi6_ifindex = 1258 (m && m->m_pkthdr.rcvif) ? m->m_pkthdr.rcvif->if_index : 0; 1259 1260 *mp = sbcreatecontrol(&pi6, sizeof(struct in6_pktinfo), 1261 IS2292(inp, IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6, 1262 M_NOWAIT); 1263 if (*mp) 1264 mp = &(*mp)->m_next; 1265 } 1266 1267 if ((inp->inp_flags & IN6P_HOPLIMIT) != 0) { 1268 int hlim; 1269 1270 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1271 #ifdef INET 1272 struct ip *ip; 1273 1274 ip = mtod(m, struct ip *); 1275 hlim = ip->ip_ttl; 1276 #else 1277 /* We won't hit this code */ 1278 hlim = 0; 1279 #endif 1280 } else { 1281 hlim = ip6->ip6_hlim & 0xff; 1282 } 1283 *mp = sbcreatecontrol(&hlim, sizeof(int), 1284 IS2292(inp, IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), 1285 IPPROTO_IPV6, M_NOWAIT); 1286 if (*mp) 1287 mp = &(*mp)->m_next; 1288 } 1289 1290 if ((inp->inp_flags & IN6P_TCLASS) != 0) { 1291 int tclass; 1292 1293 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1294 #ifdef INET 1295 struct ip *ip; 1296 1297 ip = mtod(m, struct ip *); 1298 tclass = ip->ip_tos; 1299 #else 1300 /* We won't hit this code */ 1301 tclass = 0; 1302 #endif 1303 } else { 1304 u_int32_t flowinfo; 1305 1306 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK); 1307 flowinfo >>= 20; 1308 tclass = flowinfo & 0xff; 1309 } 1310 *mp = sbcreatecontrol(&tclass, sizeof(int), IPV6_TCLASS, 1311 IPPROTO_IPV6, M_NOWAIT); 1312 if (*mp) 1313 mp = &(*mp)->m_next; 1314 } 1315 1316 if (v4only != NULL) { 1317 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1318 *v4only = 1; 1319 } else { 1320 *v4only = 0; 1321 } 1322 } 1323 1324 return (mp); 1325 } 1326 1327 void 1328 ip6_savecontrol(struct inpcb *inp, struct mbuf *m, struct mbuf **mp) 1329 { 1330 struct ip6_hdr *ip6; 1331 int v4only = 0; 1332 1333 mp = ip6_savecontrol_v4(inp, m, mp, &v4only); 1334 if (v4only) 1335 return; 1336 1337 ip6 = mtod(m, struct ip6_hdr *); 1338 /* 1339 * IPV6_HOPOPTS socket option. Recall that we required super-user 1340 * privilege for the option (see ip6_ctloutput), but it might be too 1341 * strict, since there might be some hop-by-hop options which can be 1342 * returned to normal user. 1343 * See also RFC 2292 section 6 (or RFC 3542 section 8). 1344 */ 1345 if ((inp->inp_flags & IN6P_HOPOPTS) != 0) { 1346 /* 1347 * Check if a hop-by-hop options header is contatined in the 1348 * received packet, and if so, store the options as ancillary 1349 * data. Note that a hop-by-hop options header must be 1350 * just after the IPv6 header, which is assured through the 1351 * IPv6 input processing. 1352 */ 1353 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 1354 struct ip6_hbh *hbh; 1355 u_int hbhlen; 1356 1357 hbh = (struct ip6_hbh *)(ip6 + 1); 1358 hbhlen = (hbh->ip6h_len + 1) << 3; 1359 1360 /* 1361 * XXX: We copy the whole header even if a 1362 * jumbo payload option is included, the option which 1363 * is to be removed before returning according to 1364 * RFC2292. 1365 * Note: this constraint is removed in RFC3542 1366 */ 1367 *mp = sbcreatecontrol(hbh, hbhlen, 1368 IS2292(inp, IPV6_2292HOPOPTS, IPV6_HOPOPTS), 1369 IPPROTO_IPV6, M_NOWAIT); 1370 if (*mp) 1371 mp = &(*mp)->m_next; 1372 } 1373 } 1374 1375 if ((inp->inp_flags & (IN6P_RTHDR | IN6P_DSTOPTS)) != 0) { 1376 int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr); 1377 1378 /* 1379 * Search for destination options headers or routing 1380 * header(s) through the header chain, and stores each 1381 * header as ancillary data. 1382 * Note that the order of the headers remains in 1383 * the chain of ancillary data. 1384 */ 1385 while (1) { /* is explicit loop prevention necessary? */ 1386 struct ip6_ext *ip6e = NULL; 1387 u_int elen; 1388 1389 /* 1390 * if it is not an extension header, don't try to 1391 * pull it from the chain. 1392 */ 1393 switch (nxt) { 1394 case IPPROTO_DSTOPTS: 1395 case IPPROTO_ROUTING: 1396 case IPPROTO_HOPOPTS: 1397 case IPPROTO_AH: /* is it possible? */ 1398 break; 1399 default: 1400 goto loopend; 1401 } 1402 1403 if (off + sizeof(*ip6e) > m->m_len) 1404 goto loopend; 1405 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off); 1406 if (nxt == IPPROTO_AH) 1407 elen = (ip6e->ip6e_len + 2) << 2; 1408 else 1409 elen = (ip6e->ip6e_len + 1) << 3; 1410 if (off + elen > m->m_len) 1411 goto loopend; 1412 1413 switch (nxt) { 1414 case IPPROTO_DSTOPTS: 1415 if (!(inp->inp_flags & IN6P_DSTOPTS)) 1416 break; 1417 1418 *mp = sbcreatecontrol(ip6e, elen, 1419 IS2292(inp, IPV6_2292DSTOPTS, IPV6_DSTOPTS), 1420 IPPROTO_IPV6, M_NOWAIT); 1421 if (*mp) 1422 mp = &(*mp)->m_next; 1423 break; 1424 case IPPROTO_ROUTING: 1425 if (!(inp->inp_flags & IN6P_RTHDR)) 1426 break; 1427 1428 *mp = sbcreatecontrol(ip6e, elen, 1429 IS2292(inp, IPV6_2292RTHDR, IPV6_RTHDR), 1430 IPPROTO_IPV6, M_NOWAIT); 1431 if (*mp) 1432 mp = &(*mp)->m_next; 1433 break; 1434 case IPPROTO_HOPOPTS: 1435 case IPPROTO_AH: /* is it possible? */ 1436 break; 1437 1438 default: 1439 /* 1440 * other cases have been filtered in the above. 1441 * none will visit this case. here we supply 1442 * the code just in case (nxt overwritten or 1443 * other cases). 1444 */ 1445 goto loopend; 1446 } 1447 1448 /* proceed with the next header. */ 1449 off += elen; 1450 nxt = ip6e->ip6e_nxt; 1451 ip6e = NULL; 1452 } 1453 loopend: 1454 ; 1455 } 1456 1457 if (inp->inp_flags2 & INP_RECVFLOWID) { 1458 uint32_t flowid, flow_type; 1459 1460 flowid = m->m_pkthdr.flowid; 1461 flow_type = M_HASHTYPE_GET(m); 1462 1463 /* 1464 * XXX should handle the failure of one or the 1465 * other - don't populate both? 1466 */ 1467 *mp = sbcreatecontrol(&flowid, sizeof(uint32_t), IPV6_FLOWID, 1468 IPPROTO_IPV6, M_NOWAIT); 1469 if (*mp) 1470 mp = &(*mp)->m_next; 1471 *mp = sbcreatecontrol(&flow_type, sizeof(uint32_t), 1472 IPV6_FLOWTYPE, IPPROTO_IPV6, M_NOWAIT); 1473 if (*mp) 1474 mp = &(*mp)->m_next; 1475 } 1476 1477 #ifdef RSS 1478 if (inp->inp_flags2 & INP_RECVRSSBUCKETID) { 1479 uint32_t flowid, flow_type; 1480 uint32_t rss_bucketid; 1481 1482 flowid = m->m_pkthdr.flowid; 1483 flow_type = M_HASHTYPE_GET(m); 1484 1485 if (rss_hash2bucket(flowid, flow_type, &rss_bucketid) == 0) { 1486 *mp = sbcreatecontrol(&rss_bucketid, sizeof(uint32_t), 1487 IPV6_RSSBUCKETID, IPPROTO_IPV6, M_NOWAIT); 1488 if (*mp) 1489 mp = &(*mp)->m_next; 1490 } 1491 } 1492 #endif 1493 1494 } 1495 #undef IS2292 1496 1497 void 1498 ip6_notify_pmtu(struct inpcb *inp, struct sockaddr_in6 *dst, u_int32_t mtu) 1499 { 1500 struct socket *so; 1501 struct mbuf *m_mtu; 1502 struct ip6_mtuinfo mtuctl; 1503 1504 KASSERT(inp != NULL, ("%s: inp == NULL", __func__)); 1505 /* 1506 * Notify the error by sending IPV6_PATHMTU ancillary data if 1507 * application wanted to know the MTU value. 1508 * NOTE: we notify disconnected sockets, because some udp 1509 * applications keep sending sockets disconnected. 1510 * NOTE: our implementation doesn't notify connected sockets that has 1511 * foreign address that is different than given destination addresses 1512 * (this is permitted by RFC 3542). 1513 */ 1514 if ((inp->inp_flags & IN6P_MTU) == 0 || ( 1515 !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 1516 !IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &dst->sin6_addr))) 1517 return; 1518 1519 mtuctl.ip6m_mtu = mtu; 1520 mtuctl.ip6m_addr = *dst; 1521 if (sa6_recoverscope(&mtuctl.ip6m_addr)) 1522 return; 1523 1524 if ((m_mtu = sbcreatecontrol(&mtuctl, sizeof(mtuctl), IPV6_PATHMTU, 1525 IPPROTO_IPV6, M_NOWAIT)) == NULL) 1526 return; 1527 1528 so = inp->inp_socket; 1529 if (sbappendaddr(&so->so_rcv, (struct sockaddr *)dst, NULL, m_mtu) 1530 == 0) { 1531 soroverflow(so); 1532 m_freem(m_mtu); 1533 /* XXX: should count statistics */ 1534 } else 1535 sorwakeup(so); 1536 } 1537 1538 /* 1539 * Get pointer to the previous header followed by the header 1540 * currently processed. 1541 */ 1542 int 1543 ip6_get_prevhdr(const struct mbuf *m, int off) 1544 { 1545 struct ip6_ext ip6e; 1546 struct ip6_hdr *ip6; 1547 int len, nlen, nxt; 1548 1549 if (off == sizeof(struct ip6_hdr)) 1550 return (offsetof(struct ip6_hdr, ip6_nxt)); 1551 if (off < sizeof(struct ip6_hdr)) 1552 panic("%s: off < sizeof(struct ip6_hdr)", __func__); 1553 1554 ip6 = mtod(m, struct ip6_hdr *); 1555 nxt = ip6->ip6_nxt; 1556 len = sizeof(struct ip6_hdr); 1557 nlen = 0; 1558 while (len < off) { 1559 m_copydata(m, len, sizeof(ip6e), (caddr_t)&ip6e); 1560 switch (nxt) { 1561 case IPPROTO_FRAGMENT: 1562 nlen = sizeof(struct ip6_frag); 1563 break; 1564 case IPPROTO_AH: 1565 nlen = (ip6e.ip6e_len + 2) << 2; 1566 break; 1567 default: 1568 nlen = (ip6e.ip6e_len + 1) << 3; 1569 } 1570 len += nlen; 1571 nxt = ip6e.ip6e_nxt; 1572 } 1573 return (len - nlen); 1574 } 1575 1576 /* 1577 * get next header offset. m will be retained. 1578 */ 1579 int 1580 ip6_nexthdr(const struct mbuf *m, int off, int proto, int *nxtp) 1581 { 1582 struct ip6_hdr ip6; 1583 struct ip6_ext ip6e; 1584 struct ip6_frag fh; 1585 1586 /* just in case */ 1587 if (m == NULL) 1588 panic("ip6_nexthdr: m == NULL"); 1589 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off) 1590 return -1; 1591 1592 switch (proto) { 1593 case IPPROTO_IPV6: 1594 if (m->m_pkthdr.len < off + sizeof(ip6)) 1595 return -1; 1596 m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6); 1597 if (nxtp) 1598 *nxtp = ip6.ip6_nxt; 1599 off += sizeof(ip6); 1600 return off; 1601 1602 case IPPROTO_FRAGMENT: 1603 /* 1604 * terminate parsing if it is not the first fragment, 1605 * it does not make sense to parse through it. 1606 */ 1607 if (m->m_pkthdr.len < off + sizeof(fh)) 1608 return -1; 1609 m_copydata(m, off, sizeof(fh), (caddr_t)&fh); 1610 /* IP6F_OFF_MASK = 0xfff8(BigEndian), 0xf8ff(LittleEndian) */ 1611 if (fh.ip6f_offlg & IP6F_OFF_MASK) 1612 return -1; 1613 if (nxtp) 1614 *nxtp = fh.ip6f_nxt; 1615 off += sizeof(struct ip6_frag); 1616 return off; 1617 1618 case IPPROTO_AH: 1619 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1620 return -1; 1621 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1622 if (nxtp) 1623 *nxtp = ip6e.ip6e_nxt; 1624 off += (ip6e.ip6e_len + 2) << 2; 1625 return off; 1626 1627 case IPPROTO_HOPOPTS: 1628 case IPPROTO_ROUTING: 1629 case IPPROTO_DSTOPTS: 1630 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1631 return -1; 1632 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1633 if (nxtp) 1634 *nxtp = ip6e.ip6e_nxt; 1635 off += (ip6e.ip6e_len + 1) << 3; 1636 return off; 1637 1638 case IPPROTO_NONE: 1639 case IPPROTO_ESP: 1640 case IPPROTO_IPCOMP: 1641 /* give up */ 1642 return -1; 1643 1644 default: 1645 return -1; 1646 } 1647 1648 /* NOTREACHED */ 1649 } 1650 1651 /* 1652 * get offset for the last header in the chain. m will be kept untainted. 1653 */ 1654 int 1655 ip6_lasthdr(const struct mbuf *m, int off, int proto, int *nxtp) 1656 { 1657 int newoff; 1658 int nxt; 1659 1660 if (!nxtp) { 1661 nxt = -1; 1662 nxtp = &nxt; 1663 } 1664 while (1) { 1665 newoff = ip6_nexthdr(m, off, proto, nxtp); 1666 if (newoff < 0) 1667 return off; 1668 else if (newoff < off) 1669 return -1; /* invalid */ 1670 else if (newoff == off) 1671 return newoff; 1672 1673 off = newoff; 1674 proto = *nxtp; 1675 } 1676 } 1677