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 addrsel_policy_destroy(); 402 in6_ifattach_destroy(); 403 404 hashdestroy(V_in6_ifaddrhashtbl, M_IFADDR, V_in6_ifaddrhmask); 405 } 406 407 VNET_SYSUNINIT(inet6, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, ip6_destroy, NULL); 408 #endif 409 410 static int 411 ip6_input_hbh(struct mbuf **mp, uint32_t *rtalert, int *off, 412 int *nxt, int *ours) 413 { 414 struct mbuf *m; 415 struct ip6_hdr *ip6; 416 struct ip6_hbh *hbh; 417 418 if (ip6_hopopts_input(rtalert, mp, off)) { 419 #if 0 /*touches NULL pointer*/ 420 in6_ifstat_inc((*mp)->m_pkthdr.rcvif, ifs6_in_discard); 421 #endif 422 goto out; /* m have already been freed */ 423 } 424 425 m = *mp; 426 ip6 = mtod(m, struct ip6_hdr *); 427 428 /* ip6_hopopts_input() ensures that mbuf is contiguous */ 429 hbh = (struct ip6_hbh *)(ip6 + 1); 430 *nxt = hbh->ip6h_nxt; 431 432 /* 433 * If we are acting as a router and the packet contains a 434 * router alert option, see if we know the option value. 435 * Currently, we only support the option value for MLD, in which 436 * case we should pass the packet to the multicast routing 437 * daemon. 438 */ 439 if (*rtalert != ~0) { 440 switch (*rtalert) { 441 case IP6OPT_RTALERT_MLD: 442 if (V_ip6_forwarding) 443 *ours = 1; 444 break; 445 default: 446 /* 447 * RFC2711 requires unrecognized values must be 448 * silently ignored. 449 */ 450 break; 451 } 452 } 453 454 return (0); 455 456 out: 457 return (1); 458 } 459 460 #ifdef RSS 461 /* 462 * IPv6 direct input routine. 463 * 464 * This is called when reinjecting completed fragments where 465 * all of the previous checking and book-keeping has been done. 466 */ 467 void 468 ip6_direct_input(struct mbuf *m) 469 { 470 int off, nxt; 471 int nest; 472 struct m_tag *mtag; 473 struct ip6_direct_ctx *ip6dc; 474 475 mtag = m_tag_locate(m, MTAG_ABI_IPV6, IPV6_TAG_DIRECT, NULL); 476 KASSERT(mtag != NULL, ("Reinjected packet w/o direct ctx tag!")); 477 478 ip6dc = (struct ip6_direct_ctx *)(mtag + 1); 479 nxt = ip6dc->ip6dc_nxt; 480 off = ip6dc->ip6dc_off; 481 482 nest = 0; 483 484 m_tag_delete(m, mtag); 485 486 while (nxt != IPPROTO_DONE) { 487 if (V_ip6_hdrnestlimit && (++nest > V_ip6_hdrnestlimit)) { 488 IP6STAT_INC(ip6s_toomanyhdr); 489 goto bad; 490 } 491 492 /* 493 * protection against faulty packet - there should be 494 * more sanity checks in header chain processing. 495 */ 496 if (m->m_pkthdr.len < off) { 497 IP6STAT_INC(ip6s_tooshort); 498 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 499 goto bad; 500 } 501 502 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 503 if (IPSEC_ENABLED(ipv6)) { 504 if (IPSEC_INPUT(ipv6, m, off, nxt) != 0) 505 return; 506 } 507 #endif /* IPSEC */ 508 509 nxt = ip6_protox[nxt](&m, &off, nxt); 510 } 511 return; 512 bad: 513 m_freem(m); 514 } 515 #endif 516 517 void 518 ip6_input(struct mbuf *m) 519 { 520 struct in6_addr odst; 521 struct ip6_hdr *ip6; 522 struct in6_ifaddr *ia; 523 struct ifnet *rcvif; 524 u_int32_t plen; 525 u_int32_t rtalert = ~0; 526 int off = sizeof(struct ip6_hdr), nest; 527 int nxt, ours = 0; 528 int srcrt = 0; 529 530 /* 531 * Drop the packet if IPv6 operation is disabled on the interface. 532 */ 533 rcvif = m->m_pkthdr.rcvif; 534 if ((rcvif->if_inet6->nd_flags & ND6_IFF_IFDISABLED)) 535 goto bad; 536 537 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 538 /* 539 * should the inner packet be considered authentic? 540 * see comment in ah4_input(). 541 * NB: m cannot be NULL when passed to the input routine 542 */ 543 544 m->m_flags &= ~M_AUTHIPHDR; 545 m->m_flags &= ~M_AUTHIPDGM; 546 547 #endif /* IPSEC */ 548 549 if (m->m_flags & M_FASTFWD_OURS) { 550 /* 551 * Firewall changed destination to local. 552 */ 553 ip6 = mtod(m, struct ip6_hdr *); 554 goto passin; 555 } 556 557 /* 558 * mbuf statistics 559 */ 560 if (m->m_flags & M_EXT) { 561 if (m->m_next) 562 IP6STAT_INC(ip6s_mext2m); 563 else 564 IP6STAT_INC(ip6s_mext1); 565 } else { 566 if (m->m_next) { 567 struct ifnet *ifp = (m->m_flags & M_LOOP) ? V_loif : rcvif; 568 int ifindex = ifp->if_index; 569 if (ifindex >= IP6S_M2MMAX) 570 ifindex = 0; 571 IP6STAT_INC2(ip6s_m2m, ifindex); 572 } else 573 IP6STAT_INC(ip6s_m1); 574 } 575 576 in6_ifstat_inc(rcvif, ifs6_in_receive); 577 IP6STAT_INC(ip6s_total); 578 579 /* 580 * L2 bridge code and some other code can return mbuf chain 581 * that does not conform to KAME requirement. too bad. 582 * XXX: fails to join if interface MTU > MCLBYTES. jumbogram? 583 */ 584 if (m && m->m_next != NULL && m->m_pkthdr.len < MCLBYTES) { 585 struct mbuf *n; 586 587 if (m->m_pkthdr.len > MHLEN) 588 n = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 589 else 590 n = m_gethdr(M_NOWAIT, MT_DATA); 591 if (n == NULL) 592 goto bad; 593 594 m_move_pkthdr(n, m); 595 m_copydata(m, 0, n->m_pkthdr.len, mtod(n, caddr_t)); 596 n->m_len = n->m_pkthdr.len; 597 m_freem(m); 598 m = n; 599 } 600 if (m->m_len < sizeof(struct ip6_hdr)) { 601 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 602 IP6STAT_INC(ip6s_toosmall); 603 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 604 goto bad; 605 } 606 } 607 608 ip6 = mtod(m, struct ip6_hdr *); 609 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 610 IP6STAT_INC(ip6s_badvers); 611 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 612 goto bad; 613 } 614 615 IP6STAT_INC2(ip6s_nxthist, ip6->ip6_nxt); 616 IP_PROBE(receive, NULL, NULL, ip6, rcvif, NULL, ip6); 617 618 /* 619 * Check against address spoofing/corruption. The unspecified address 620 * is checked further below. 621 */ 622 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) { 623 /* 624 * XXX: "badscope" is not very suitable for a multicast source. 625 */ 626 IP6STAT_INC(ip6s_badscope); 627 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 628 goto bad; 629 } 630 if (IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) && 631 !(m->m_flags & M_LOOP)) { 632 /* 633 * In this case, the packet should come from the loopback 634 * interface. However, we cannot just check the if_flags, 635 * because ip6_mloopback() passes the "actual" interface 636 * as the outgoing/incoming interface. 637 */ 638 IP6STAT_INC(ip6s_badscope); 639 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 640 goto bad; 641 } 642 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && 643 IPV6_ADDR_MC_SCOPE(&ip6->ip6_dst) == 0) { 644 /* 645 * RFC4291 2.7: 646 * Nodes must not originate a packet to a multicast address 647 * whose scop field contains the reserved value 0; if such 648 * a packet is received, it must be silently dropped. 649 */ 650 IP6STAT_INC(ip6s_badscope); 651 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 652 goto bad; 653 } 654 /* 655 * The following check is not documented in specs. A malicious 656 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack 657 * and bypass security checks (act as if it was from 127.0.0.1 by using 658 * IPv6 src ::ffff:127.0.0.1). Be cautious. 659 * 660 * We have supported IPv6-only kernels for a few years and this issue 661 * has not come up. The world seems to move mostly towards not using 662 * v4mapped on the wire, so it makes sense for us to keep rejecting 663 * any such packets. 664 */ 665 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 666 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 667 IP6STAT_INC(ip6s_badscope); 668 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 669 goto bad; 670 } 671 /* 672 * Try to forward the packet, but if we fail continue. 673 * ip6_tryforward() does not generate redirects, so fall 674 * through to normal processing if redirects are required. 675 * ip6_tryforward() does inbound and outbound packet firewall 676 * processing. If firewall has decided that destination becomes 677 * our local address, it sets M_FASTFWD_OURS flag. In this 678 * case skip another inbound firewall processing and update 679 * ip6 pointer. 680 */ 681 if (V_ip6_forwarding != 0 && V_ip6_sendredirects == 0 682 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 683 && (!IPSEC_ENABLED(ipv6) || 684 IPSEC_CAPS(ipv6, m, IPSEC_CAP_OPERABLE) == 0) 685 #endif 686 ) { 687 if ((m = ip6_tryforward(m)) == NULL) 688 return; 689 if (m->m_flags & M_FASTFWD_OURS) { 690 ip6 = mtod(m, struct ip6_hdr *); 691 goto passin; 692 } 693 } 694 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 695 /* 696 * Bypass packet filtering for packets previously handled by IPsec. 697 */ 698 if (IPSEC_ENABLED(ipv6) && 699 IPSEC_CAPS(ipv6, m, IPSEC_CAP_BYPASS_FILTER) != 0) 700 goto passin; 701 #endif 702 /* 703 * Run through list of hooks for input packets. 704 * 705 * NB: Beware of the destination address changing 706 * (e.g. by NAT rewriting). When this happens, 707 * tell ip6_forward to do the right thing. 708 */ 709 710 /* Jump over all PFIL processing if hooks are not active. */ 711 if (!PFIL_HOOKED_IN(V_inet6_pfil_head)) 712 goto passin; 713 714 odst = ip6->ip6_dst; 715 if (pfil_mbuf_in(V_inet6_pfil_head, &m, m->m_pkthdr.rcvif, 716 NULL) != PFIL_PASS) 717 return; 718 ip6 = mtod(m, struct ip6_hdr *); 719 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst); 720 if ((m->m_flags & (M_IP6_NEXTHOP | M_FASTFWD_OURS)) == M_IP6_NEXTHOP && 721 m_tag_find(m, PACKET_TAG_IPFORWARD, NULL) != NULL) { 722 /* 723 * Directly ship the packet on. This allows forwarding 724 * packets originally destined to us to some other directly 725 * connected host. 726 */ 727 ip6_forward(m, 1); 728 return; 729 } 730 731 passin: 732 /* 733 * The check is deferred to here to give firewalls a chance to block 734 * (and log) such packets. ip6_tryforward() will not process such 735 * packets. 736 */ 737 if (__predict_false(IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst))) { 738 IP6STAT_INC(ip6s_badscope); 739 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 740 goto bad; 741 } 742 743 plen = (uint32_t)ntohs(ip6->ip6_plen); 744 745 /* 746 * We don't support Jumbograms, reject packets with plen == 0 as early 747 * as we can. 748 */ 749 if (__predict_false(plen == 0)) { 750 IP6STAT_INC(ip6s_tooshort); 751 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 752 goto bad; 753 } 754 755 /* 756 * Disambiguate address scope zones (if there is ambiguity). 757 * We first make sure that the original source or destination address 758 * is not in our internal form for scoped addresses. Such addresses 759 * are not necessarily invalid spec-wise, but we cannot accept them due 760 * to the usage conflict. 761 * in6_setscope() then also checks and rejects the cases where src or 762 * dst are the loopback address and the receiving interface 763 * is not loopback. 764 */ 765 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) { 766 IP6STAT_INC(ip6s_badscope); /* XXX */ 767 goto bad; 768 } 769 if (in6_setscope(&ip6->ip6_src, rcvif, NULL) || 770 in6_setscope(&ip6->ip6_dst, rcvif, NULL)) { 771 IP6STAT_INC(ip6s_badscope); 772 goto bad; 773 } 774 if (m->m_flags & M_FASTFWD_OURS) { 775 m->m_flags &= ~M_FASTFWD_OURS; 776 ours = 1; 777 goto hbhcheck; 778 } 779 /* 780 * Multicast check. Assume packet is for us to avoid 781 * prematurely taking locks. 782 */ 783 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 784 ours = 1; 785 in6_ifstat_inc(rcvif, ifs6_in_mcast); 786 goto hbhcheck; 787 } 788 /* 789 * Unicast check 790 * XXX: For now we keep link-local IPv6 addresses with embedded 791 * scope zone id, therefore we use zero zoneid here. 792 */ 793 ia = in6ifa_ifwithaddr(&ip6->ip6_dst, 0 /* XXX */, false); 794 if (ia != NULL) { 795 if (ia->ia6_flags & IN6_IFF_NOTREADY) { 796 char ip6bufs[INET6_ADDRSTRLEN]; 797 char ip6bufd[INET6_ADDRSTRLEN]; 798 /* address is not ready, so discard the packet. */ 799 nd6log((LOG_INFO, 800 "ip6_input: packet to an unready address %s->%s\n", 801 ip6_sprintf(ip6bufs, &ip6->ip6_src), 802 ip6_sprintf(ip6bufd, &ip6->ip6_dst))); 803 goto bad; 804 } 805 if (V_ip6_sav && !(m->m_flags & M_LOOP) && 806 __predict_false(in6_localip_fib(&ip6->ip6_src, 807 rcvif->if_fib))) { 808 IP6STAT_INC(ip6s_badscope); /* XXX */ 809 goto bad; 810 } 811 /* Count the packet in the ip address stats */ 812 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1); 813 counter_u64_add(ia->ia_ifa.ifa_ibytes, m->m_pkthdr.len); 814 ours = 1; 815 goto hbhcheck; 816 } 817 818 /* 819 * Now there is no reason to process the packet if it's not our own 820 * and we're not a router. 821 */ 822 if (!V_ip6_forwarding) { 823 IP6STAT_INC(ip6s_cantforward); 824 goto bad; 825 } 826 827 hbhcheck: 828 /* 829 * Process Hop-by-Hop options header if it's contained. 830 * m may be modified in ip6_hopopts_input(). 831 */ 832 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 833 if (ip6_input_hbh(&m, &rtalert, &off, &nxt, &ours) != 0) 834 return; 835 } else 836 nxt = ip6->ip6_nxt; 837 838 /* 839 * Use mbuf flags to propagate Router Alert option to 840 * ICMPv6 layer, as hop-by-hop options have been stripped. 841 */ 842 if (rtalert != ~0) 843 m->m_flags |= M_RTALERT_MLD; 844 845 /* 846 * Check that the amount of data in the buffers 847 * is as at least much as the IPv6 header would have us expect. 848 * Trim mbufs if longer than we expect. 849 * Drop packet if shorter than we expect. 850 */ 851 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 852 IP6STAT_INC(ip6s_tooshort); 853 in6_ifstat_inc(rcvif, ifs6_in_truncated); 854 goto bad; 855 } 856 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 857 if (m->m_len == m->m_pkthdr.len) { 858 m->m_len = sizeof(struct ip6_hdr) + plen; 859 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 860 } else 861 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 862 } 863 864 /* 865 * Forward if desirable. 866 */ 867 if (V_ip6_mrouting_enabled && 868 IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 869 /* 870 * If we are acting as a multicast router, all 871 * incoming multicast packets are passed to the 872 * kernel-level multicast forwarding function. 873 * The packet is returned (relatively) intact; if 874 * ip6_mforward() returns a non-zero value, the packet 875 * must be discarded, else it may be accepted below. 876 * 877 * XXX TODO: Check hlim and multicast scope here to avoid 878 * unnecessarily calling into ip6_mforward(). 879 */ 880 if (ip6_mforward && ip6_mforward(ip6, rcvif, m)) { 881 IP6STAT_INC(ip6s_cantforward); 882 goto bad; 883 } 884 } else if (!ours) { 885 ip6_forward(m, srcrt); 886 return; 887 } 888 889 /* 890 * We are going to ship the packet to the local protocol stack. Call the 891 * filter again for this 'output' action, allowing redirect-like rules 892 * to adjust the source address. 893 */ 894 if (PFIL_HOOKED_OUT(V_inet6_local_pfil_head)) { 895 if (pfil_mbuf_out(V_inet6_local_pfil_head, &m, V_loif, NULL) != 896 PFIL_PASS) 897 return; 898 ip6 = mtod(m, struct ip6_hdr *); 899 } 900 901 /* 902 * Tell launch routine the next header 903 */ 904 IP6STAT_INC(ip6s_delivered); 905 in6_ifstat_inc(rcvif, ifs6_in_deliver); 906 nest = 0; 907 908 while (nxt != IPPROTO_DONE) { 909 if (V_ip6_hdrnestlimit && (++nest > V_ip6_hdrnestlimit)) { 910 IP6STAT_INC(ip6s_toomanyhdr); 911 goto bad; 912 } 913 914 /* 915 * protection against faulty packet - there should be 916 * more sanity checks in header chain processing. 917 */ 918 if (m->m_pkthdr.len < off) { 919 IP6STAT_INC(ip6s_tooshort); 920 in6_ifstat_inc(rcvif, ifs6_in_truncated); 921 goto bad; 922 } 923 924 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 925 if (IPSEC_ENABLED(ipv6)) { 926 if (IPSEC_INPUT(ipv6, m, off, nxt) != 0) 927 return; 928 } 929 #endif /* IPSEC */ 930 931 nxt = ip6_protox[nxt](&m, &off, nxt); 932 } 933 return; 934 bad: 935 in6_ifstat_inc(rcvif, ifs6_in_discard); 936 if (m != NULL) 937 m_freem(m); 938 } 939 940 /* 941 * Hop-by-Hop options header processing. If a valid jumbo payload option is 942 * included report an error. 943 * 944 * rtalertp - XXX: should be stored more smart way 945 */ 946 static int 947 ip6_hopopts_input(u_int32_t *rtalertp, struct mbuf **mp, int *offp) 948 { 949 struct mbuf *m = *mp; 950 int off = *offp, hbhlen; 951 struct ip6_hbh *hbh; 952 953 /* validation of the length of the header */ 954 if (m->m_len < off + sizeof(*hbh)) { 955 m = m_pullup(m, off + sizeof(*hbh)); 956 if (m == NULL) { 957 IP6STAT_INC(ip6s_exthdrtoolong); 958 *mp = NULL; 959 return (-1); 960 } 961 } 962 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); 963 hbhlen = (hbh->ip6h_len + 1) << 3; 964 965 if (m->m_len < off + hbhlen) { 966 m = m_pullup(m, off + hbhlen); 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 off += hbhlen; 975 hbhlen -= sizeof(struct ip6_hbh); 976 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 977 hbhlen, rtalertp) < 0) { 978 *mp = NULL; 979 return (-1); 980 } 981 982 *offp = off; 983 *mp = m; 984 return (0); 985 } 986 987 /* 988 * Search header for all Hop-by-hop options and process each option. 989 * This function is separate from ip6_hopopts_input() in order to 990 * handle a case where the sending node itself process its hop-by-hop 991 * options header. In such a case, the function is called from ip6_output(). 992 * 993 * The function assumes that hbh header is located right after the IPv6 header 994 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to 995 * opthead + hbhlen is located in contiguous memory region. 996 */ 997 int 998 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen, 999 u_int32_t *rtalertp) 1000 { 1001 int optlen = 0; 1002 u_int8_t *opt = opthead; 1003 u_int16_t rtalert_val; 1004 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh); 1005 1006 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 1007 switch (*opt) { 1008 case IP6OPT_PAD1: 1009 optlen = 1; 1010 break; 1011 case IP6OPT_PADN: 1012 if (hbhlen < IP6OPT_MINLEN) { 1013 IP6STAT_INC(ip6s_toosmall); 1014 goto bad; 1015 } 1016 optlen = *(opt + 1) + 2; 1017 break; 1018 case IP6OPT_ROUTER_ALERT: 1019 /* XXX may need check for alignment */ 1020 if (hbhlen < IP6OPT_RTALERT_LEN) { 1021 IP6STAT_INC(ip6s_toosmall); 1022 goto bad; 1023 } 1024 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) { 1025 /* XXX stat */ 1026 icmp6_error(m, ICMP6_PARAM_PROB, 1027 ICMP6_PARAMPROB_HEADER, 1028 erroff + opt + 1 - opthead); 1029 return (-1); 1030 } 1031 optlen = IP6OPT_RTALERT_LEN; 1032 bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2); 1033 *rtalertp = ntohs(rtalert_val); 1034 break; 1035 case IP6OPT_JUMBO: 1036 /* We do not support the Jumbo Payload option. */ 1037 goto bad; 1038 default: /* unknown option */ 1039 if (hbhlen < IP6OPT_MINLEN) { 1040 IP6STAT_INC(ip6s_toosmall); 1041 goto bad; 1042 } 1043 optlen = ip6_unknown_opt(opt, m, 1044 erroff + opt - opthead); 1045 if (optlen == -1) 1046 return (-1); 1047 optlen += 2; 1048 break; 1049 } 1050 } 1051 1052 return (0); 1053 1054 bad: 1055 m_freem(m); 1056 return (-1); 1057 } 1058 1059 /* 1060 * Unknown option processing. 1061 * The third argument `off' is the offset from the IPv6 header to the option, 1062 * which is necessary if the IPv6 header the and option header and IPv6 header 1063 * is not contiguous in order to return an ICMPv6 error. 1064 */ 1065 int 1066 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off) 1067 { 1068 struct ip6_hdr *ip6; 1069 1070 switch (IP6OPT_TYPE(*optp)) { 1071 case IP6OPT_TYPE_SKIP: /* ignore the option */ 1072 return ((int)*(optp + 1)); 1073 case IP6OPT_TYPE_DISCARD: /* silently discard */ 1074 m_freem(m); 1075 return (-1); 1076 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 1077 IP6STAT_INC(ip6s_badoptions); 1078 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 1079 return (-1); 1080 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 1081 IP6STAT_INC(ip6s_badoptions); 1082 ip6 = mtod(m, struct ip6_hdr *); 1083 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 1084 (m->m_flags & (M_BCAST|M_MCAST))) 1085 m_freem(m); 1086 else 1087 icmp6_error(m, ICMP6_PARAM_PROB, 1088 ICMP6_PARAMPROB_OPTION, off); 1089 return (-1); 1090 } 1091 1092 m_freem(m); /* XXX: NOTREACHED */ 1093 return (-1); 1094 } 1095 1096 /* 1097 * Create the "control" list for this pcb. 1098 * These functions will not modify mbuf chain at all. 1099 * 1100 * The routine will be called from upper layer handlers like tcp6_input(). 1101 * Thus the routine assumes that the caller (tcp6_input) have already 1102 * called m_pullup() and all the extension headers are located in the 1103 * very first mbuf on the mbuf chain. 1104 * 1105 * ip6_savecontrol_v4 will handle those options that are possible to be 1106 * set on a v4-mapped socket. 1107 * ip6_savecontrol will directly call ip6_savecontrol_v4 to handle those 1108 * options and handle the v6-only ones itself. 1109 */ 1110 struct mbuf ** 1111 ip6_savecontrol_v4(struct inpcb *inp, struct mbuf *m, struct mbuf **mp, 1112 int *v4only) 1113 { 1114 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1115 1116 #if defined(SO_TIMESTAMP) && defined(SO_BINTIME) 1117 if ((inp->inp_socket->so_options & (SO_TIMESTAMP | SO_BINTIME)) != 0) { 1118 union { 1119 struct timeval tv; 1120 struct bintime bt; 1121 struct timespec ts; 1122 } t; 1123 struct bintime boottimebin, bt1; 1124 struct timespec ts1; 1125 int ts_clock; 1126 bool stamped; 1127 1128 ts_clock = inp->inp_socket->so_ts_clock; 1129 stamped = false; 1130 1131 /* 1132 * Handle BINTIME first. We create the same output options 1133 * for both SO_BINTIME and the case where SO_TIMESTAMP is 1134 * set with the timestamp clock set to SO_TS_BINTIME. 1135 */ 1136 if ((inp->inp_socket->so_options & SO_BINTIME) != 0 || 1137 ts_clock == SO_TS_BINTIME) { 1138 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1139 M_TSTMP)) { 1140 mbuf_tstmp2timespec(m, &ts1); 1141 timespec2bintime(&ts1, &t.bt); 1142 getboottimebin(&boottimebin); 1143 bintime_add(&t.bt, &boottimebin); 1144 } else { 1145 bintime(&t.bt); 1146 } 1147 *mp = sbcreatecontrol(&t.bt, sizeof(t.bt), SCM_BINTIME, 1148 SOL_SOCKET, M_NOWAIT); 1149 if (*mp != NULL) { 1150 mp = &(*mp)->m_next; 1151 stamped = true; 1152 } 1153 1154 /* 1155 * Suppress other timestamps if SO_TIMESTAMP is not 1156 * set. 1157 */ 1158 if ((inp->inp_socket->so_options & SO_TIMESTAMP) == 0) 1159 ts_clock = SO_TS_BINTIME; 1160 } 1161 1162 switch (ts_clock) { 1163 case SO_TS_REALTIME_MICRO: 1164 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1165 M_TSTMP)) { 1166 mbuf_tstmp2timespec(m, &ts1); 1167 timespec2bintime(&ts1, &bt1); 1168 getboottimebin(&boottimebin); 1169 bintime_add(&bt1, &boottimebin); 1170 bintime2timeval(&bt1, &t.tv); 1171 } else { 1172 microtime(&t.tv); 1173 } 1174 *mp = sbcreatecontrol(&t.tv, sizeof(t.tv), 1175 SCM_TIMESTAMP, SOL_SOCKET, M_NOWAIT); 1176 if (*mp != NULL) { 1177 mp = &(*mp)->m_next; 1178 stamped = true; 1179 } 1180 break; 1181 1182 case SO_TS_BINTIME: 1183 break; 1184 1185 case SO_TS_REALTIME: 1186 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1187 M_TSTMP)) { 1188 mbuf_tstmp2timespec(m, &t.ts); 1189 getboottimebin(&boottimebin); 1190 bintime2timespec(&boottimebin, &ts1); 1191 timespecadd(&t.ts, &ts1, &t.ts); 1192 } else { 1193 nanotime(&t.ts); 1194 } 1195 *mp = sbcreatecontrol(&t.ts, sizeof(t.ts), 1196 SCM_REALTIME, SOL_SOCKET, M_NOWAIT); 1197 if (*mp != NULL) { 1198 mp = &(*mp)->m_next; 1199 stamped = true; 1200 } 1201 break; 1202 1203 case SO_TS_MONOTONIC: 1204 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1205 M_TSTMP)) 1206 mbuf_tstmp2timespec(m, &t.ts); 1207 else 1208 nanouptime(&t.ts); 1209 *mp = sbcreatecontrol(&t.ts, sizeof(t.ts), 1210 SCM_MONOTONIC, SOL_SOCKET, M_NOWAIT); 1211 if (*mp != NULL) { 1212 mp = &(*mp)->m_next; 1213 stamped = true; 1214 } 1215 break; 1216 1217 default: 1218 panic("unknown (corrupted) so_ts_clock"); 1219 } 1220 if (stamped && (m->m_flags & (M_PKTHDR | M_TSTMP)) == 1221 (M_PKTHDR | M_TSTMP)) { 1222 struct sock_timestamp_info sti; 1223 1224 bzero(&sti, sizeof(sti)); 1225 sti.st_info_flags = ST_INFO_HW; 1226 if ((m->m_flags & M_TSTMP_HPREC) != 0) 1227 sti.st_info_flags |= ST_INFO_HW_HPREC; 1228 *mp = sbcreatecontrol(&sti, sizeof(sti), SCM_TIME_INFO, 1229 SOL_SOCKET, M_NOWAIT); 1230 if (*mp != NULL) 1231 mp = &(*mp)->m_next; 1232 } 1233 } 1234 #endif 1235 1236 #define IS2292(inp, x, y) (((inp)->inp_flags & IN6P_RFC2292) ? (x) : (y)) 1237 /* RFC 2292 sec. 5 */ 1238 if ((inp->inp_flags & IN6P_PKTINFO) != 0) { 1239 struct in6_pktinfo pi6; 1240 1241 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1242 #ifdef INET 1243 struct ip *ip; 1244 1245 ip = mtod(m, struct ip *); 1246 pi6.ipi6_addr.s6_addr32[0] = 0; 1247 pi6.ipi6_addr.s6_addr32[1] = 0; 1248 pi6.ipi6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP; 1249 pi6.ipi6_addr.s6_addr32[3] = ip->ip_dst.s_addr; 1250 #else 1251 /* We won't hit this code */ 1252 bzero(&pi6.ipi6_addr, sizeof(struct in6_addr)); 1253 #endif 1254 } else { 1255 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr)); 1256 in6_clearscope(&pi6.ipi6_addr); /* XXX */ 1257 } 1258 pi6.ipi6_ifindex = 1259 (m && m->m_pkthdr.rcvif) ? m->m_pkthdr.rcvif->if_index : 0; 1260 1261 *mp = sbcreatecontrol(&pi6, sizeof(struct in6_pktinfo), 1262 IS2292(inp, IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6, 1263 M_NOWAIT); 1264 if (*mp) 1265 mp = &(*mp)->m_next; 1266 } 1267 1268 if ((inp->inp_flags & IN6P_HOPLIMIT) != 0) { 1269 int hlim; 1270 1271 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1272 #ifdef INET 1273 struct ip *ip; 1274 1275 ip = mtod(m, struct ip *); 1276 hlim = ip->ip_ttl; 1277 #else 1278 /* We won't hit this code */ 1279 hlim = 0; 1280 #endif 1281 } else { 1282 hlim = ip6->ip6_hlim & 0xff; 1283 } 1284 *mp = sbcreatecontrol(&hlim, sizeof(int), 1285 IS2292(inp, IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), 1286 IPPROTO_IPV6, M_NOWAIT); 1287 if (*mp) 1288 mp = &(*mp)->m_next; 1289 } 1290 1291 if ((inp->inp_flags & IN6P_TCLASS) != 0) { 1292 int tclass; 1293 1294 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1295 #ifdef INET 1296 struct ip *ip; 1297 1298 ip = mtod(m, struct ip *); 1299 tclass = ip->ip_tos; 1300 #else 1301 /* We won't hit this code */ 1302 tclass = 0; 1303 #endif 1304 } else { 1305 u_int32_t flowinfo; 1306 1307 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK); 1308 flowinfo >>= 20; 1309 tclass = flowinfo & 0xff; 1310 } 1311 *mp = sbcreatecontrol(&tclass, sizeof(int), IPV6_TCLASS, 1312 IPPROTO_IPV6, M_NOWAIT); 1313 if (*mp) 1314 mp = &(*mp)->m_next; 1315 } 1316 1317 if (v4only != NULL) { 1318 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1319 *v4only = 1; 1320 } else { 1321 *v4only = 0; 1322 } 1323 } 1324 1325 return (mp); 1326 } 1327 1328 void 1329 ip6_savecontrol(struct inpcb *inp, struct mbuf *m, struct mbuf **mp) 1330 { 1331 struct ip6_hdr *ip6; 1332 int v4only = 0; 1333 1334 mp = ip6_savecontrol_v4(inp, m, mp, &v4only); 1335 if (v4only) 1336 return; 1337 1338 ip6 = mtod(m, struct ip6_hdr *); 1339 /* 1340 * IPV6_HOPOPTS socket option. Recall that we required super-user 1341 * privilege for the option (see ip6_ctloutput), but it might be too 1342 * strict, since there might be some hop-by-hop options which can be 1343 * returned to normal user. 1344 * See also RFC 2292 section 6 (or RFC 3542 section 8). 1345 */ 1346 if ((inp->inp_flags & IN6P_HOPOPTS) != 0) { 1347 /* 1348 * Check if a hop-by-hop options header is contatined in the 1349 * received packet, and if so, store the options as ancillary 1350 * data. Note that a hop-by-hop options header must be 1351 * just after the IPv6 header, which is assured through the 1352 * IPv6 input processing. 1353 */ 1354 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 1355 struct ip6_hbh *hbh; 1356 u_int hbhlen; 1357 1358 hbh = (struct ip6_hbh *)(ip6 + 1); 1359 hbhlen = (hbh->ip6h_len + 1) << 3; 1360 1361 /* 1362 * XXX: We copy the whole header even if a 1363 * jumbo payload option is included, the option which 1364 * is to be removed before returning according to 1365 * RFC2292. 1366 * Note: this constraint is removed in RFC3542 1367 */ 1368 *mp = sbcreatecontrol(hbh, hbhlen, 1369 IS2292(inp, IPV6_2292HOPOPTS, IPV6_HOPOPTS), 1370 IPPROTO_IPV6, M_NOWAIT); 1371 if (*mp) 1372 mp = &(*mp)->m_next; 1373 } 1374 } 1375 1376 if ((inp->inp_flags & (IN6P_RTHDR | IN6P_DSTOPTS)) != 0) { 1377 int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr); 1378 1379 /* 1380 * Search for destination options headers or routing 1381 * header(s) through the header chain, and stores each 1382 * header as ancillary data. 1383 * Note that the order of the headers remains in 1384 * the chain of ancillary data. 1385 */ 1386 while (1) { /* is explicit loop prevention necessary? */ 1387 struct ip6_ext *ip6e = NULL; 1388 u_int elen; 1389 1390 /* 1391 * if it is not an extension header, don't try to 1392 * pull it from the chain. 1393 */ 1394 switch (nxt) { 1395 case IPPROTO_DSTOPTS: 1396 case IPPROTO_ROUTING: 1397 case IPPROTO_HOPOPTS: 1398 case IPPROTO_AH: /* is it possible? */ 1399 break; 1400 default: 1401 goto loopend; 1402 } 1403 1404 if (off + sizeof(*ip6e) > m->m_len) 1405 goto loopend; 1406 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off); 1407 if (nxt == IPPROTO_AH) 1408 elen = (ip6e->ip6e_len + 2) << 2; 1409 else 1410 elen = (ip6e->ip6e_len + 1) << 3; 1411 if (off + elen > m->m_len) 1412 goto loopend; 1413 1414 switch (nxt) { 1415 case IPPROTO_DSTOPTS: 1416 if (!(inp->inp_flags & IN6P_DSTOPTS)) 1417 break; 1418 1419 *mp = sbcreatecontrol(ip6e, elen, 1420 IS2292(inp, IPV6_2292DSTOPTS, IPV6_DSTOPTS), 1421 IPPROTO_IPV6, M_NOWAIT); 1422 if (*mp) 1423 mp = &(*mp)->m_next; 1424 break; 1425 case IPPROTO_ROUTING: 1426 if (!(inp->inp_flags & IN6P_RTHDR)) 1427 break; 1428 1429 *mp = sbcreatecontrol(ip6e, elen, 1430 IS2292(inp, IPV6_2292RTHDR, IPV6_RTHDR), 1431 IPPROTO_IPV6, M_NOWAIT); 1432 if (*mp) 1433 mp = &(*mp)->m_next; 1434 break; 1435 case IPPROTO_HOPOPTS: 1436 case IPPROTO_AH: /* is it possible? */ 1437 break; 1438 1439 default: 1440 /* 1441 * other cases have been filtered in the above. 1442 * none will visit this case. here we supply 1443 * the code just in case (nxt overwritten or 1444 * other cases). 1445 */ 1446 goto loopend; 1447 } 1448 1449 /* proceed with the next header. */ 1450 off += elen; 1451 nxt = ip6e->ip6e_nxt; 1452 ip6e = NULL; 1453 } 1454 loopend: 1455 ; 1456 } 1457 1458 if (inp->inp_flags2 & INP_RECVFLOWID) { 1459 uint32_t flowid, flow_type; 1460 1461 flowid = m->m_pkthdr.flowid; 1462 flow_type = M_HASHTYPE_GET(m); 1463 1464 /* 1465 * XXX should handle the failure of one or the 1466 * other - don't populate both? 1467 */ 1468 *mp = sbcreatecontrol(&flowid, sizeof(uint32_t), IPV6_FLOWID, 1469 IPPROTO_IPV6, M_NOWAIT); 1470 if (*mp) 1471 mp = &(*mp)->m_next; 1472 *mp = sbcreatecontrol(&flow_type, sizeof(uint32_t), 1473 IPV6_FLOWTYPE, IPPROTO_IPV6, M_NOWAIT); 1474 if (*mp) 1475 mp = &(*mp)->m_next; 1476 } 1477 1478 #ifdef RSS 1479 if (inp->inp_flags2 & INP_RECVRSSBUCKETID) { 1480 uint32_t flowid, flow_type; 1481 uint32_t rss_bucketid; 1482 1483 flowid = m->m_pkthdr.flowid; 1484 flow_type = M_HASHTYPE_GET(m); 1485 1486 if (rss_hash2bucket(flowid, flow_type, &rss_bucketid) == 0) { 1487 *mp = sbcreatecontrol(&rss_bucketid, sizeof(uint32_t), 1488 IPV6_RSSBUCKETID, IPPROTO_IPV6, M_NOWAIT); 1489 if (*mp) 1490 mp = &(*mp)->m_next; 1491 } 1492 } 1493 #endif 1494 1495 } 1496 #undef IS2292 1497 1498 void 1499 ip6_notify_pmtu(struct inpcb *inp, struct sockaddr_in6 *dst, u_int32_t mtu) 1500 { 1501 struct socket *so; 1502 struct mbuf *m_mtu; 1503 struct ip6_mtuinfo mtuctl; 1504 1505 KASSERT(inp != NULL, ("%s: inp == NULL", __func__)); 1506 /* 1507 * Notify the error by sending IPV6_PATHMTU ancillary data if 1508 * application wanted to know the MTU value. 1509 * NOTE: we notify disconnected sockets, because some udp 1510 * applications keep sending sockets disconnected. 1511 * NOTE: our implementation doesn't notify connected sockets that has 1512 * foreign address that is different than given destination addresses 1513 * (this is permitted by RFC 3542). 1514 */ 1515 if ((inp->inp_flags & IN6P_MTU) == 0 || ( 1516 !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 1517 !IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &dst->sin6_addr))) 1518 return; 1519 1520 mtuctl.ip6m_mtu = mtu; 1521 mtuctl.ip6m_addr = *dst; 1522 if (sa6_recoverscope(&mtuctl.ip6m_addr)) 1523 return; 1524 1525 if ((m_mtu = sbcreatecontrol(&mtuctl, sizeof(mtuctl), IPV6_PATHMTU, 1526 IPPROTO_IPV6, M_NOWAIT)) == NULL) 1527 return; 1528 1529 so = inp->inp_socket; 1530 if (sbappendaddr(&so->so_rcv, (struct sockaddr *)dst, NULL, m_mtu) 1531 == 0) { 1532 soroverflow(so); 1533 m_freem(m_mtu); 1534 /* XXX: should count statistics */ 1535 } else 1536 sorwakeup(so); 1537 } 1538 1539 /* 1540 * Get pointer to the previous header followed by the header 1541 * currently processed. 1542 */ 1543 int 1544 ip6_get_prevhdr(const struct mbuf *m, int off) 1545 { 1546 struct ip6_ext ip6e; 1547 struct ip6_hdr *ip6; 1548 int len, nlen, nxt; 1549 1550 if (off == sizeof(struct ip6_hdr)) 1551 return (offsetof(struct ip6_hdr, ip6_nxt)); 1552 if (off < sizeof(struct ip6_hdr)) 1553 panic("%s: off < sizeof(struct ip6_hdr)", __func__); 1554 1555 ip6 = mtod(m, struct ip6_hdr *); 1556 nxt = ip6->ip6_nxt; 1557 len = sizeof(struct ip6_hdr); 1558 nlen = 0; 1559 while (len < off) { 1560 m_copydata(m, len, sizeof(ip6e), (caddr_t)&ip6e); 1561 switch (nxt) { 1562 case IPPROTO_FRAGMENT: 1563 nlen = sizeof(struct ip6_frag); 1564 break; 1565 case IPPROTO_AH: 1566 nlen = (ip6e.ip6e_len + 2) << 2; 1567 break; 1568 default: 1569 nlen = (ip6e.ip6e_len + 1) << 3; 1570 } 1571 len += nlen; 1572 nxt = ip6e.ip6e_nxt; 1573 } 1574 return (len - nlen); 1575 } 1576 1577 /* 1578 * get next header offset. m will be retained. 1579 */ 1580 int 1581 ip6_nexthdr(const struct mbuf *m, int off, int proto, int *nxtp) 1582 { 1583 struct ip6_hdr ip6; 1584 struct ip6_ext ip6e; 1585 struct ip6_frag fh; 1586 1587 /* just in case */ 1588 if (m == NULL) 1589 panic("ip6_nexthdr: m == NULL"); 1590 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off) 1591 return -1; 1592 1593 switch (proto) { 1594 case IPPROTO_IPV6: 1595 if (m->m_pkthdr.len < off + sizeof(ip6)) 1596 return -1; 1597 m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6); 1598 if (nxtp) 1599 *nxtp = ip6.ip6_nxt; 1600 off += sizeof(ip6); 1601 return off; 1602 1603 case IPPROTO_FRAGMENT: 1604 /* 1605 * terminate parsing if it is not the first fragment, 1606 * it does not make sense to parse through it. 1607 */ 1608 if (m->m_pkthdr.len < off + sizeof(fh)) 1609 return -1; 1610 m_copydata(m, off, sizeof(fh), (caddr_t)&fh); 1611 /* IP6F_OFF_MASK = 0xfff8(BigEndian), 0xf8ff(LittleEndian) */ 1612 if (fh.ip6f_offlg & IP6F_OFF_MASK) 1613 return -1; 1614 if (nxtp) 1615 *nxtp = fh.ip6f_nxt; 1616 off += sizeof(struct ip6_frag); 1617 return off; 1618 1619 case IPPROTO_AH: 1620 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1621 return -1; 1622 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1623 if (nxtp) 1624 *nxtp = ip6e.ip6e_nxt; 1625 off += (ip6e.ip6e_len + 2) << 2; 1626 return off; 1627 1628 case IPPROTO_HOPOPTS: 1629 case IPPROTO_ROUTING: 1630 case IPPROTO_DSTOPTS: 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 + 1) << 3; 1637 return off; 1638 1639 case IPPROTO_NONE: 1640 case IPPROTO_ESP: 1641 case IPPROTO_IPCOMP: 1642 /* give up */ 1643 return -1; 1644 1645 default: 1646 return -1; 1647 } 1648 1649 /* NOTREACHED */ 1650 } 1651 1652 /* 1653 * get offset for the last header in the chain. m will be kept untainted. 1654 */ 1655 int 1656 ip6_lasthdr(const struct mbuf *m, int off, int proto, int *nxtp) 1657 { 1658 int newoff; 1659 int nxt; 1660 1661 if (!nxtp) { 1662 nxt = -1; 1663 nxtp = &nxt; 1664 } 1665 while (1) { 1666 newoff = ip6_nexthdr(m, off, proto, nxtp); 1667 if (newoff < 0) 1668 return off; 1669 else if (newoff < off) 1670 return -1; /* invalid */ 1671 else if (newoff == off) 1672 return newoff; 1673 1674 off = newoff; 1675 proto = *nxtp; 1676 } 1677 } 1678