1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the project nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * $KAME: ip6_input.c,v 1.259 2002/01/21 04:58:09 jinmei Exp $ 32 */ 33 34 /*- 35 * Copyright (c) 1982, 1986, 1988, 1993 36 * The Regents of the University of California. All rights reserved. 37 * 38 * Redistribution and use in source and binary forms, with or without 39 * modification, are permitted provided that the following conditions 40 * are met: 41 * 1. Redistributions of source code must retain the above copyright 42 * notice, this list of conditions and the following disclaimer. 43 * 2. Redistributions in binary form must reproduce the above copyright 44 * notice, this list of conditions and the following disclaimer in the 45 * documentation and/or other materials provided with the distribution. 46 * 3. Neither the name of the University nor the names of its contributors 47 * may be used to endorse or promote products derived from this software 48 * without specific prior written permission. 49 * 50 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 51 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 53 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 54 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 55 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 56 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 57 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 58 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 59 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 60 * SUCH DAMAGE. 61 */ 62 63 #include "opt_inet.h" 64 #include "opt_inet6.h" 65 #include "opt_ipsec.h" 66 #include "opt_route.h" 67 #include "opt_rss.h" 68 #include "opt_sctp.h" 69 70 #include <sys/param.h> 71 #include <sys/systm.h> 72 #include <sys/hhook.h> 73 #include <sys/malloc.h> 74 #include <sys/mbuf.h> 75 #include <sys/proc.h> 76 #include <sys/domain.h> 77 #include <sys/protosw.h> 78 #include <sys/sdt.h> 79 #include <sys/socket.h> 80 #include <sys/socketvar.h> 81 #include <sys/errno.h> 82 #include <sys/time.h> 83 #include <sys/kernel.h> 84 #include <sys/lock.h> 85 #include <sys/rmlock.h> 86 #include <sys/syslog.h> 87 #include <sys/sysctl.h> 88 #include <sys/eventhandler.h> 89 90 #include <net/if.h> 91 #include <net/if_var.h> 92 #include <net/if_types.h> 93 #include <net/if_private.h> 94 #include <net/if_dl.h> 95 #include <net/route.h> 96 #include <net/netisr.h> 97 #include <net/rss_config.h> 98 #include <net/pfil.h> 99 #include <net/vnet.h> 100 101 #include <netinet/in.h> 102 #include <netinet/in_kdtrace.h> 103 #include <netinet/ip_var.h> 104 #include <netinet/in_systm.h> 105 #include <net/if_llatbl.h> 106 #ifdef INET 107 #include <netinet/ip.h> 108 #include <netinet/ip_icmp.h> 109 #endif /* INET */ 110 #include <netinet/ip6.h> 111 #include <netinet6/in6_var.h> 112 #include <netinet6/ip6_var.h> 113 #include <netinet/ip_encap.h> 114 #include <netinet/in_pcb.h> 115 #include <netinet/icmp6.h> 116 #include <netinet6/scope6_var.h> 117 #include <netinet6/in6_ifattach.h> 118 #include <netinet6/mld6_var.h> 119 #include <netinet6/nd6.h> 120 #include <netinet6/in6_rss.h> 121 #include <netinet6/ip6_mroute.h> 122 #ifdef SCTP 123 #include <netinet/sctp_pcb.h> 124 #include <netinet6/sctp6_var.h> 125 #endif 126 127 #include <netipsec/ipsec_support.h> 128 129 ip6proto_input_t *ip6_protox[IPPROTO_MAX] = { 130 [0 ... IPPROTO_MAX - 1] = rip6_input }; 131 ip6proto_ctlinput_t *ip6_ctlprotox[IPPROTO_MAX] = { 132 [0 ... IPPROTO_MAX - 1] = rip6_ctlinput }; 133 134 VNET_DEFINE(struct in6_ifaddrhead, in6_ifaddrhead); 135 VNET_DEFINE(struct in6_ifaddrlisthead *, in6_ifaddrhashtbl); 136 VNET_DEFINE(u_long, in6_ifaddrhmask); 137 138 static struct netisr_handler ip6_nh = { 139 .nh_name = "ip6", 140 .nh_handler = ip6_input, 141 .nh_proto = NETISR_IPV6, 142 #ifdef RSS 143 .nh_m2cpuid = rss_soft_m2cpuid_v6, 144 .nh_policy = NETISR_POLICY_CPU, 145 .nh_dispatch = NETISR_DISPATCH_HYBRID, 146 #else 147 .nh_policy = NETISR_POLICY_FLOW, 148 #endif 149 }; 150 151 static int 152 sysctl_netinet6_intr_queue_maxlen(SYSCTL_HANDLER_ARGS) 153 { 154 int error, qlimit; 155 156 netisr_getqlimit(&ip6_nh, &qlimit); 157 error = sysctl_handle_int(oidp, &qlimit, 0, req); 158 if (error || !req->newptr) 159 return (error); 160 if (qlimit < 1) 161 return (EINVAL); 162 return (netisr_setqlimit(&ip6_nh, qlimit)); 163 } 164 SYSCTL_DECL(_net_inet6_ip6); 165 SYSCTL_PROC(_net_inet6_ip6, IPV6CTL_INTRQMAXLEN, intr_queue_maxlen, 166 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 167 0, 0, sysctl_netinet6_intr_queue_maxlen, "I", 168 "Maximum size of the IPv6 input queue"); 169 170 VNET_DEFINE_STATIC(bool, ip6_sav) = true; 171 #define V_ip6_sav VNET(ip6_sav) 172 SYSCTL_BOOL(_net_inet6_ip6, OID_AUTO, source_address_validation, 173 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_sav), true, 174 "Drop incoming packets with source address that is a local address"); 175 176 SYSCTL_UINT(_net_inet6_ip6, OID_AUTO, temp_max_desync_factor, 177 CTLFLAG_RD | CTLFLAG_VNET, 178 &VNET_NAME(ip6_temp_max_desync_factor), 0, 179 "RFC 8981 max desync factor"); 180 181 #ifdef RSS 182 static struct netisr_handler ip6_direct_nh = { 183 .nh_name = "ip6_direct", 184 .nh_handler = ip6_direct_input, 185 .nh_proto = NETISR_IPV6_DIRECT, 186 .nh_m2cpuid = rss_soft_m2cpuid_v6, 187 .nh_policy = NETISR_POLICY_CPU, 188 .nh_dispatch = NETISR_DISPATCH_HYBRID, 189 }; 190 191 static int 192 sysctl_netinet6_intr_direct_queue_maxlen(SYSCTL_HANDLER_ARGS) 193 { 194 int error, qlimit; 195 196 netisr_getqlimit(&ip6_direct_nh, &qlimit); 197 error = sysctl_handle_int(oidp, &qlimit, 0, req); 198 if (error || !req->newptr) 199 return (error); 200 if (qlimit < 1) 201 return (EINVAL); 202 return (netisr_setqlimit(&ip6_direct_nh, qlimit)); 203 } 204 SYSCTL_PROC(_net_inet6_ip6, IPV6CTL_INTRDQMAXLEN, intr_direct_queue_maxlen, 205 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 206 0, 0, sysctl_netinet6_intr_direct_queue_maxlen, "I", 207 "Maximum size of the IPv6 direct input queue"); 208 209 #endif 210 211 VNET_DEFINE(pfil_head_t, inet6_pfil_head); 212 VNET_DEFINE(pfil_head_t, inet6_local_pfil_head); 213 214 VNET_PCPUSTAT_DEFINE(struct ip6stat, ip6stat); 215 VNET_PCPUSTAT_SYSINIT(ip6stat); 216 #ifdef VIMAGE 217 VNET_PCPUSTAT_SYSUNINIT(ip6stat); 218 #endif /* VIMAGE */ 219 220 struct rmlock in6_ifaddr_lock; 221 RM_SYSINIT(in6_ifaddr_lock, &in6_ifaddr_lock, "in6_ifaddr_lock"); 222 223 static int ip6_hopopts_input(u_int32_t *, struct mbuf **, int *); 224 225 /* 226 * IP6 initialization: fill in IP6 protocol switch table. 227 * All protocols not implemented in kernel go to raw IP6 protocol handler. 228 */ 229 static void 230 ip6_vnet_init(void *arg __unused) 231 { 232 struct pfil_head_args args; 233 234 TUNABLE_INT_FETCH("net.inet6.ip6.auto_linklocal", 235 &V_ip6_auto_linklocal); 236 TUNABLE_INT_FETCH("net.inet6.ip6.accept_rtadv", &V_ip6_accept_rtadv); 237 TUNABLE_INT_FETCH("net.inet6.ip6.no_radr", &V_ip6_no_radr); 238 TUNABLE_BOOL_FETCH("net.inet6.ip6.use_stableaddr", &V_ip6_use_stableaddr); 239 240 CK_STAILQ_INIT(&V_in6_ifaddrhead); 241 V_in6_ifaddrhashtbl = hashinit(IN6ADDR_NHASH, M_IFADDR, 242 &V_in6_ifaddrhmask); 243 244 /* Initialize packet filter hooks. */ 245 args.pa_version = PFIL_VERSION; 246 args.pa_flags = PFIL_IN | PFIL_OUT; 247 args.pa_type = PFIL_TYPE_IP6; 248 args.pa_headname = PFIL_INET6_NAME; 249 V_inet6_pfil_head = pfil_head_register(&args); 250 251 args.pa_flags = PFIL_OUT; 252 args.pa_headname = PFIL_INET6_LOCAL_NAME; 253 V_inet6_local_pfil_head = pfil_head_register(&args); 254 255 if (hhook_head_register(HHOOK_TYPE_IPSEC_IN, AF_INET6, 256 &V_ipsec_hhh_in[HHOOK_IPSEC_INET6], 257 HHOOK_WAITOK | HHOOK_HEADISINVNET) != 0) 258 printf("%s: WARNING: unable to register input helper hook\n", 259 __func__); 260 if (hhook_head_register(HHOOK_TYPE_IPSEC_OUT, AF_INET6, 261 &V_ipsec_hhh_out[HHOOK_IPSEC_INET6], 262 HHOOK_WAITOK | HHOOK_HEADISINVNET) != 0) 263 printf("%s: WARNING: unable to register output helper hook\n", 264 __func__); 265 266 scope6_init(); 267 addrsel_policy_init(); 268 nd6_init(); 269 frag6_init(); 270 271 V_ip6_temp_max_desync_factor = TEMP_MAX_DESYNC_FACTOR_BASE + 272 (V_ip6_temp_preferred_lifetime >> 2) + 273 (V_ip6_temp_preferred_lifetime >> 3); 274 V_ip6_desync_factor = arc4random() % V_ip6_temp_max_desync_factor; 275 276 /* Skip global initialization stuff for non-default instances. */ 277 #ifdef VIMAGE 278 netisr_register_vnet(&ip6_nh); 279 #ifdef RSS 280 netisr_register_vnet(&ip6_direct_nh); 281 #endif 282 #endif 283 } 284 VNET_SYSINIT(ip6_vnet_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH, 285 ip6_vnet_init, NULL); 286 287 static void 288 ip6_init(void *arg __unused) 289 { 290 struct ifnet *ifp; 291 292 /* 293 * Register statically those protocols that are unlikely to ever go 294 * dynamic. 295 */ 296 IP6PROTO_REGISTER(IPPROTO_ICMPV6, icmp6_input, rip6_ctlinput); 297 IP6PROTO_REGISTER(IPPROTO_DSTOPTS, dest6_input, NULL); 298 IP6PROTO_REGISTER(IPPROTO_ROUTING, route6_input, NULL); 299 IP6PROTO_REGISTER(IPPROTO_FRAGMENT, frag6_input, NULL); 300 IP6PROTO_REGISTER(IPPROTO_IPV4, encap6_input, NULL); 301 IP6PROTO_REGISTER(IPPROTO_IPV6, encap6_input, NULL); 302 IP6PROTO_REGISTER(IPPROTO_ETHERIP, encap6_input, NULL); 303 IP6PROTO_REGISTER(IPPROTO_GRE, encap6_input, NULL); 304 IP6PROTO_REGISTER(IPPROTO_PIM, encap6_input, NULL); 305 #ifdef SCTP /* XXX: has a loadable & static version */ 306 IP6PROTO_REGISTER(IPPROTO_SCTP, sctp6_input, sctp6_ctlinput); 307 #endif 308 309 EVENTHANDLER_REGISTER(vm_lowmem, frag6_drain, NULL, LOWMEM_PRI_DEFAULT); 310 EVENTHANDLER_REGISTER(mbuf_lowmem, frag6_drain, NULL, 311 LOWMEM_PRI_DEFAULT); 312 313 netisr_register(&ip6_nh); 314 #ifdef RSS 315 netisr_register(&ip6_direct_nh); 316 #endif 317 /* 318 * XXXGL: we use SYSINIT() here, but go over V_ifnet. See comment 319 * in sys/netinet/ip_input.c:ip_init(). 320 */ 321 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) 322 in6_ifarrival(NULL, ifp); 323 } 324 SYSINIT(ip6_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, ip6_init, NULL); 325 326 int 327 ip6proto_register(uint8_t proto, ip6proto_input_t input, 328 ip6proto_ctlinput_t ctl) 329 { 330 331 MPASS(proto > 0); 332 333 if (ip6_protox[proto] == rip6_input) { 334 ip6_protox[proto] = input; 335 ip6_ctlprotox[proto] = ctl; 336 return (0); 337 } else 338 return (EEXIST); 339 } 340 341 int 342 ip6proto_unregister(uint8_t proto) 343 { 344 345 MPASS(proto > 0); 346 347 if (ip6_protox[proto] != rip6_input) { 348 ip6_protox[proto] = rip6_input; 349 ip6_ctlprotox[proto] = rip6_ctlinput; 350 return (0); 351 } else 352 return (ENOENT); 353 } 354 355 #ifdef VIMAGE 356 static void 357 ip6_destroy(void *unused __unused) 358 { 359 struct ifaddr *ifa, *nifa; 360 struct ifnet *ifp; 361 int error; 362 363 #ifdef RSS 364 netisr_unregister_vnet(&ip6_direct_nh); 365 #endif 366 netisr_unregister_vnet(&ip6_nh); 367 368 pfil_head_unregister(V_inet6_pfil_head); 369 error = hhook_head_deregister(V_ipsec_hhh_in[HHOOK_IPSEC_INET6]); 370 if (error != 0) { 371 printf("%s: WARNING: unable to deregister input helper hook " 372 "type HHOOK_TYPE_IPSEC_IN, id HHOOK_IPSEC_INET6: " 373 "error %d returned\n", __func__, error); 374 } 375 error = hhook_head_deregister(V_ipsec_hhh_out[HHOOK_IPSEC_INET6]); 376 if (error != 0) { 377 printf("%s: WARNING: unable to deregister output helper hook " 378 "type HHOOK_TYPE_IPSEC_OUT, id HHOOK_IPSEC_INET6: " 379 "error %d returned\n", __func__, error); 380 } 381 382 /* Cleanup addresses. */ 383 IFNET_RLOCK(); 384 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 385 /* Cannot lock here - lock recursion. */ 386 /* IF_ADDR_LOCK(ifp); */ 387 CK_STAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, nifa) { 388 if (ifa->ifa_addr->sa_family != AF_INET6) 389 continue; 390 in6_purgeaddr(ifa); 391 } 392 /* IF_ADDR_UNLOCK(ifp); */ 393 in6_ifdetach_destroy(ifp); 394 } 395 IFNET_RUNLOCK(); 396 397 /* Make sure any routes are gone as well. */ 398 rib_flush_routes_family(AF_INET6); 399 400 frag6_destroy(); 401 nd6_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 /* adjust pointer */ 426 m = *mp; 427 ip6 = mtod(m, struct ip6_hdr *); 428 429 /* 430 * If the payload length field is 0 and the next header field indicates 431 * Hop-by-Hop Options header, then a Jumbo Payload option MUST be 432 * included. We no not support Jumbo Payloads so report an error. 433 */ 434 if (ip6->ip6_plen == 0) { 435 IP6STAT_INC(ip6s_badoptions); 436 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 437 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 438 icmp6_error(m, ICMP6_PARAM_PROB, 439 ICMP6_PARAMPROB_HEADER, 440 (caddr_t)&ip6->ip6_plen - (caddr_t)ip6); 441 goto out; 442 } 443 /* ip6_hopopts_input() ensures that mbuf is contiguous */ 444 hbh = (struct ip6_hbh *)(ip6 + 1); 445 *nxt = hbh->ip6h_nxt; 446 447 /* 448 * If we are acting as a router and the packet contains a 449 * router alert option, see if we know the option value. 450 * Currently, we only support the option value for MLD, in which 451 * case we should pass the packet to the multicast routing 452 * daemon. 453 */ 454 if (*rtalert != ~0) { 455 switch (*rtalert) { 456 case IP6OPT_RTALERT_MLD: 457 if (V_ip6_forwarding) 458 *ours = 1; 459 break; 460 default: 461 /* 462 * RFC2711 requires unrecognized values must be 463 * silently ignored. 464 */ 465 break; 466 } 467 } 468 469 return (0); 470 471 out: 472 return (1); 473 } 474 475 #ifdef RSS 476 /* 477 * IPv6 direct input routine. 478 * 479 * This is called when reinjecting completed fragments where 480 * all of the previous checking and book-keeping has been done. 481 */ 482 void 483 ip6_direct_input(struct mbuf *m) 484 { 485 int off, nxt; 486 int nest; 487 struct m_tag *mtag; 488 struct ip6_direct_ctx *ip6dc; 489 490 mtag = m_tag_locate(m, MTAG_ABI_IPV6, IPV6_TAG_DIRECT, NULL); 491 KASSERT(mtag != NULL, ("Reinjected packet w/o direct ctx tag!")); 492 493 ip6dc = (struct ip6_direct_ctx *)(mtag + 1); 494 nxt = ip6dc->ip6dc_nxt; 495 off = ip6dc->ip6dc_off; 496 497 nest = 0; 498 499 m_tag_delete(m, mtag); 500 501 while (nxt != IPPROTO_DONE) { 502 if (V_ip6_hdrnestlimit && (++nest > V_ip6_hdrnestlimit)) { 503 IP6STAT_INC(ip6s_toomanyhdr); 504 goto bad; 505 } 506 507 /* 508 * protection against faulty packet - there should be 509 * more sanity checks in header chain processing. 510 */ 511 if (m->m_pkthdr.len < off) { 512 IP6STAT_INC(ip6s_tooshort); 513 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 514 goto bad; 515 } 516 517 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 518 if (IPSEC_ENABLED(ipv6)) { 519 if (IPSEC_INPUT(ipv6, m, off, nxt) != 0) 520 return; 521 } 522 #endif /* IPSEC */ 523 524 nxt = ip6_protox[nxt](&m, &off, nxt); 525 } 526 return; 527 bad: 528 m_freem(m); 529 } 530 #endif 531 532 void 533 ip6_input(struct mbuf *m) 534 { 535 struct in6_addr odst; 536 struct ip6_hdr *ip6; 537 struct in6_ifaddr *ia; 538 struct ifnet *rcvif; 539 u_int32_t plen; 540 u_int32_t rtalert = ~0; 541 int off = sizeof(struct ip6_hdr), nest; 542 int nxt, ours = 0; 543 int srcrt = 0; 544 545 /* 546 * Drop the packet if IPv6 operation is disabled on the interface. 547 */ 548 rcvif = m->m_pkthdr.rcvif; 549 if ((rcvif->if_inet6->nd_flags & ND6_IFF_IFDISABLED)) 550 goto bad; 551 552 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 553 /* 554 * should the inner packet be considered authentic? 555 * see comment in ah4_input(). 556 * NB: m cannot be NULL when passed to the input routine 557 */ 558 559 m->m_flags &= ~M_AUTHIPHDR; 560 m->m_flags &= ~M_AUTHIPDGM; 561 562 #endif /* IPSEC */ 563 564 if (m->m_flags & M_FASTFWD_OURS) { 565 /* 566 * Firewall changed destination to local. 567 */ 568 ip6 = mtod(m, struct ip6_hdr *); 569 goto passin; 570 } 571 572 /* 573 * mbuf statistics 574 */ 575 if (m->m_flags & M_EXT) { 576 if (m->m_next) 577 IP6STAT_INC(ip6s_mext2m); 578 else 579 IP6STAT_INC(ip6s_mext1); 580 } else { 581 if (m->m_next) { 582 struct ifnet *ifp = (m->m_flags & M_LOOP) ? V_loif : rcvif; 583 int ifindex = ifp->if_index; 584 if (ifindex >= IP6S_M2MMAX) 585 ifindex = 0; 586 IP6STAT_INC2(ip6s_m2m, ifindex); 587 } else 588 IP6STAT_INC(ip6s_m1); 589 } 590 591 in6_ifstat_inc(rcvif, ifs6_in_receive); 592 IP6STAT_INC(ip6s_total); 593 594 /* 595 * L2 bridge code and some other code can return mbuf chain 596 * that does not conform to KAME requirement. too bad. 597 * XXX: fails to join if interface MTU > MCLBYTES. jumbogram? 598 */ 599 if (m && m->m_next != NULL && m->m_pkthdr.len < MCLBYTES) { 600 struct mbuf *n; 601 602 if (m->m_pkthdr.len > MHLEN) 603 n = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 604 else 605 n = m_gethdr(M_NOWAIT, MT_DATA); 606 if (n == NULL) 607 goto bad; 608 609 m_move_pkthdr(n, m); 610 m_copydata(m, 0, n->m_pkthdr.len, mtod(n, caddr_t)); 611 n->m_len = n->m_pkthdr.len; 612 m_freem(m); 613 m = n; 614 } 615 if (m->m_len < sizeof(struct ip6_hdr)) { 616 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 617 IP6STAT_INC(ip6s_toosmall); 618 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 619 goto bad; 620 } 621 } 622 623 ip6 = mtod(m, struct ip6_hdr *); 624 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 625 IP6STAT_INC(ip6s_badvers); 626 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 627 goto bad; 628 } 629 630 IP6STAT_INC2(ip6s_nxthist, ip6->ip6_nxt); 631 IP_PROBE(receive, NULL, NULL, ip6, rcvif, NULL, ip6); 632 633 /* 634 * Check against address spoofing/corruption. The unspecified address 635 * is checked further below. 636 */ 637 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) { 638 /* 639 * XXX: "badscope" is not very suitable for a multicast source. 640 */ 641 IP6STAT_INC(ip6s_badscope); 642 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 643 goto bad; 644 } 645 if (IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) && 646 !(m->m_flags & M_LOOP)) { 647 /* 648 * In this case, the packet should come from the loopback 649 * interface. However, we cannot just check the if_flags, 650 * because ip6_mloopback() passes the "actual" interface 651 * as the outgoing/incoming interface. 652 */ 653 IP6STAT_INC(ip6s_badscope); 654 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 655 goto bad; 656 } 657 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && 658 IPV6_ADDR_MC_SCOPE(&ip6->ip6_dst) == 0) { 659 /* 660 * RFC4291 2.7: 661 * Nodes must not originate a packet to a multicast address 662 * whose scop field contains the reserved value 0; if such 663 * a packet is received, it must be silently dropped. 664 */ 665 IP6STAT_INC(ip6s_badscope); 666 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 667 goto bad; 668 } 669 /* 670 * The following check is not documented in specs. A malicious 671 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack 672 * and bypass security checks (act as if it was from 127.0.0.1 by using 673 * IPv6 src ::ffff:127.0.0.1). Be cautious. 674 * 675 * We have supported IPv6-only kernels for a few years and this issue 676 * has not come up. The world seems to move mostly towards not using 677 * v4mapped on the wire, so it makes sense for us to keep rejecting 678 * any such packets. 679 */ 680 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 681 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 682 IP6STAT_INC(ip6s_badscope); 683 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 684 goto bad; 685 } 686 #if 0 687 /* 688 * Reject packets with IPv4 compatible addresses (auto tunnel). 689 * 690 * The code forbids auto tunnel relay case in RFC1933 (the check is 691 * stronger than RFC1933). We may want to re-enable it if mech-xx 692 * is revised to forbid relaying case. 693 */ 694 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) || 695 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) { 696 IP6STAT_INC(ip6s_badscope); 697 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 698 goto bad; 699 } 700 #endif 701 /* 702 * Try to forward the packet, but if we fail continue. 703 * ip6_tryforward() does not generate redirects, so fall 704 * through to normal processing if redirects are required. 705 * ip6_tryforward() does inbound and outbound packet firewall 706 * processing. If firewall has decided that destination becomes 707 * our local address, it sets M_FASTFWD_OURS flag. In this 708 * case skip another inbound firewall processing and update 709 * ip6 pointer. 710 */ 711 if (V_ip6_forwarding != 0 && V_ip6_sendredirects == 0 712 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 713 && (!IPSEC_ENABLED(ipv6) || 714 IPSEC_CAPS(ipv6, m, IPSEC_CAP_OPERABLE) == 0) 715 #endif 716 ) { 717 if ((m = ip6_tryforward(m)) == NULL) 718 return; 719 if (m->m_flags & M_FASTFWD_OURS) { 720 ip6 = mtod(m, struct ip6_hdr *); 721 goto passin; 722 } 723 } 724 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 725 /* 726 * Bypass packet filtering for packets previously handled by IPsec. 727 */ 728 if (IPSEC_ENABLED(ipv6) && 729 IPSEC_CAPS(ipv6, m, IPSEC_CAP_BYPASS_FILTER) != 0) 730 goto passin; 731 #endif 732 /* 733 * Run through list of hooks for input packets. 734 * 735 * NB: Beware of the destination address changing 736 * (e.g. by NAT rewriting). When this happens, 737 * tell ip6_forward to do the right thing. 738 */ 739 740 /* Jump over all PFIL processing if hooks are not active. */ 741 if (!PFIL_HOOKED_IN(V_inet6_pfil_head)) 742 goto passin; 743 744 odst = ip6->ip6_dst; 745 if (pfil_mbuf_in(V_inet6_pfil_head, &m, m->m_pkthdr.rcvif, 746 NULL) != PFIL_PASS) 747 return; 748 ip6 = mtod(m, struct ip6_hdr *); 749 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst); 750 if ((m->m_flags & (M_IP6_NEXTHOP | M_FASTFWD_OURS)) == M_IP6_NEXTHOP && 751 m_tag_find(m, PACKET_TAG_IPFORWARD, NULL) != NULL) { 752 /* 753 * Directly ship the packet on. This allows forwarding 754 * packets originally destined to us to some other directly 755 * connected host. 756 */ 757 ip6_forward(m, 1); 758 return; 759 } 760 761 passin: 762 /* 763 * The check is deferred to here to give firewalls a chance to block 764 * (and log) such packets. ip6_tryforward() will not process such 765 * packets. 766 */ 767 if (__predict_false(IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst))) { 768 IP6STAT_INC(ip6s_badscope); 769 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 770 goto bad; 771 } 772 773 plen = (uint32_t)ntohs(ip6->ip6_plen); 774 775 /* 776 * We don't support Jumbograms, reject packets with plen == 0 as early 777 * as we can. 778 */ 779 if (plen == 0) 780 goto bad; 781 782 /* 783 * Disambiguate address scope zones (if there is ambiguity). 784 * We first make sure that the original source or destination address 785 * is not in our internal form for scoped addresses. Such addresses 786 * are not necessarily invalid spec-wise, but we cannot accept them due 787 * to the usage conflict. 788 * in6_setscope() then also checks and rejects the cases where src or 789 * dst are the loopback address and the receiving interface 790 * is not loopback. 791 */ 792 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) { 793 IP6STAT_INC(ip6s_badscope); /* XXX */ 794 goto bad; 795 } 796 if (in6_setscope(&ip6->ip6_src, rcvif, NULL) || 797 in6_setscope(&ip6->ip6_dst, rcvif, NULL)) { 798 IP6STAT_INC(ip6s_badscope); 799 goto bad; 800 } 801 if (m->m_flags & M_FASTFWD_OURS) { 802 m->m_flags &= ~M_FASTFWD_OURS; 803 ours = 1; 804 goto hbhcheck; 805 } 806 /* 807 * Multicast check. Assume packet is for us to avoid 808 * prematurely taking locks. 809 */ 810 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 811 ours = 1; 812 in6_ifstat_inc(rcvif, ifs6_in_mcast); 813 goto hbhcheck; 814 } 815 /* 816 * Unicast check 817 * XXX: For now we keep link-local IPv6 addresses with embedded 818 * scope zone id, therefore we use zero zoneid here. 819 */ 820 ia = in6ifa_ifwithaddr(&ip6->ip6_dst, 0 /* XXX */, false); 821 if (ia != NULL) { 822 if (ia->ia6_flags & IN6_IFF_NOTREADY) { 823 char ip6bufs[INET6_ADDRSTRLEN]; 824 char ip6bufd[INET6_ADDRSTRLEN]; 825 /* address is not ready, so discard the packet. */ 826 nd6log((LOG_INFO, 827 "ip6_input: packet to an unready address %s->%s\n", 828 ip6_sprintf(ip6bufs, &ip6->ip6_src), 829 ip6_sprintf(ip6bufd, &ip6->ip6_dst))); 830 goto bad; 831 } 832 if (V_ip6_sav && !(m->m_flags & M_LOOP) && 833 __predict_false(in6_localip_fib(&ip6->ip6_src, 834 rcvif->if_fib))) { 835 IP6STAT_INC(ip6s_badscope); /* XXX */ 836 goto bad; 837 } 838 /* Count the packet in the ip address stats */ 839 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1); 840 counter_u64_add(ia->ia_ifa.ifa_ibytes, m->m_pkthdr.len); 841 ours = 1; 842 goto hbhcheck; 843 } 844 845 /* 846 * Now there is no reason to process the packet if it's not our own 847 * and we're not a router. 848 */ 849 if (!V_ip6_forwarding) { 850 IP6STAT_INC(ip6s_cantforward); 851 goto bad; 852 } 853 854 hbhcheck: 855 /* 856 * Process Hop-by-Hop options header if it's contained. 857 * m may be modified in ip6_hopopts_input(). 858 */ 859 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 860 if (ip6_input_hbh(&m, &rtalert, &off, &nxt, &ours) != 0) 861 return; 862 } else 863 nxt = ip6->ip6_nxt; 864 865 /* 866 * Use mbuf flags to propagate Router Alert option to 867 * ICMPv6 layer, as hop-by-hop options have been stripped. 868 */ 869 if (rtalert != ~0) 870 m->m_flags |= M_RTALERT_MLD; 871 872 /* 873 * Check that the amount of data in the buffers 874 * is as at least much as the IPv6 header would have us expect. 875 * Trim mbufs if longer than we expect. 876 * Drop packet if shorter than we expect. 877 */ 878 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 879 IP6STAT_INC(ip6s_tooshort); 880 in6_ifstat_inc(rcvif, ifs6_in_truncated); 881 goto bad; 882 } 883 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 884 if (m->m_len == m->m_pkthdr.len) { 885 m->m_len = sizeof(struct ip6_hdr) + plen; 886 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 887 } else 888 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 889 } 890 891 /* 892 * Forward if desirable. 893 */ 894 if (V_ip6_mrouting_enabled && 895 IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 896 /* 897 * If we are acting as a multicast router, all 898 * incoming multicast packets are passed to the 899 * kernel-level multicast forwarding function. 900 * The packet is returned (relatively) intact; if 901 * ip6_mforward() returns a non-zero value, the packet 902 * must be discarded, else it may be accepted below. 903 * 904 * XXX TODO: Check hlim and multicast scope here to avoid 905 * unnecessarily calling into ip6_mforward(). 906 */ 907 if (ip6_mforward && ip6_mforward(ip6, rcvif, m)) { 908 IP6STAT_INC(ip6s_cantforward); 909 goto bad; 910 } 911 } else if (!ours) { 912 ip6_forward(m, srcrt); 913 return; 914 } 915 916 /* 917 * We are going to ship the packet to the local protocol stack. Call the 918 * filter again for this 'output' action, allowing redirect-like rules 919 * to adjust the source address. 920 */ 921 if (PFIL_HOOKED_OUT(V_inet6_local_pfil_head)) { 922 if (pfil_mbuf_out(V_inet6_local_pfil_head, &m, V_loif, NULL) != 923 PFIL_PASS) 924 return; 925 ip6 = mtod(m, struct ip6_hdr *); 926 } 927 928 /* 929 * Tell launch routine the next header 930 */ 931 IP6STAT_INC(ip6s_delivered); 932 in6_ifstat_inc(rcvif, ifs6_in_deliver); 933 nest = 0; 934 935 while (nxt != IPPROTO_DONE) { 936 if (V_ip6_hdrnestlimit && (++nest > V_ip6_hdrnestlimit)) { 937 IP6STAT_INC(ip6s_toomanyhdr); 938 goto bad; 939 } 940 941 /* 942 * protection against faulty packet - there should be 943 * more sanity checks in header chain processing. 944 */ 945 if (m->m_pkthdr.len < off) { 946 IP6STAT_INC(ip6s_tooshort); 947 in6_ifstat_inc(rcvif, ifs6_in_truncated); 948 goto bad; 949 } 950 951 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 952 if (IPSEC_ENABLED(ipv6)) { 953 if (IPSEC_INPUT(ipv6, m, off, nxt) != 0) 954 return; 955 } 956 #endif /* IPSEC */ 957 958 nxt = ip6_protox[nxt](&m, &off, nxt); 959 } 960 return; 961 bad: 962 in6_ifstat_inc(rcvif, ifs6_in_discard); 963 if (m != NULL) 964 m_freem(m); 965 } 966 967 /* 968 * Hop-by-Hop options header processing. If a valid jumbo payload option is 969 * included report an error. 970 * 971 * rtalertp - XXX: should be stored more smart way 972 */ 973 static int 974 ip6_hopopts_input(u_int32_t *rtalertp, struct mbuf **mp, int *offp) 975 { 976 struct mbuf *m = *mp; 977 int off = *offp, hbhlen; 978 struct ip6_hbh *hbh; 979 980 /* validation of the length of the header */ 981 if (m->m_len < off + sizeof(*hbh)) { 982 m = m_pullup(m, off + sizeof(*hbh)); 983 if (m == NULL) { 984 IP6STAT_INC(ip6s_exthdrtoolong); 985 *mp = NULL; 986 return (-1); 987 } 988 } 989 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); 990 hbhlen = (hbh->ip6h_len + 1) << 3; 991 992 if (m->m_len < off + hbhlen) { 993 m = m_pullup(m, off + hbhlen); 994 if (m == NULL) { 995 IP6STAT_INC(ip6s_exthdrtoolong); 996 *mp = NULL; 997 return (-1); 998 } 999 } 1000 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); 1001 off += hbhlen; 1002 hbhlen -= sizeof(struct ip6_hbh); 1003 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 1004 hbhlen, rtalertp) < 0) { 1005 *mp = NULL; 1006 return (-1); 1007 } 1008 1009 *offp = off; 1010 *mp = m; 1011 return (0); 1012 } 1013 1014 /* 1015 * Search header for all Hop-by-hop options and process each option. 1016 * This function is separate from ip6_hopopts_input() in order to 1017 * handle a case where the sending node itself process its hop-by-hop 1018 * options header. In such a case, the function is called from ip6_output(). 1019 * 1020 * The function assumes that hbh header is located right after the IPv6 header 1021 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to 1022 * opthead + hbhlen is located in contiguous memory region. 1023 */ 1024 int 1025 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen, 1026 u_int32_t *rtalertp) 1027 { 1028 int optlen = 0; 1029 u_int8_t *opt = opthead; 1030 u_int16_t rtalert_val; 1031 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh); 1032 1033 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 1034 switch (*opt) { 1035 case IP6OPT_PAD1: 1036 optlen = 1; 1037 break; 1038 case IP6OPT_PADN: 1039 if (hbhlen < IP6OPT_MINLEN) { 1040 IP6STAT_INC(ip6s_toosmall); 1041 goto bad; 1042 } 1043 optlen = *(opt + 1) + 2; 1044 break; 1045 case IP6OPT_ROUTER_ALERT: 1046 /* XXX may need check for alignment */ 1047 if (hbhlen < IP6OPT_RTALERT_LEN) { 1048 IP6STAT_INC(ip6s_toosmall); 1049 goto bad; 1050 } 1051 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) { 1052 /* XXX stat */ 1053 icmp6_error(m, ICMP6_PARAM_PROB, 1054 ICMP6_PARAMPROB_HEADER, 1055 erroff + opt + 1 - opthead); 1056 return (-1); 1057 } 1058 optlen = IP6OPT_RTALERT_LEN; 1059 bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2); 1060 *rtalertp = ntohs(rtalert_val); 1061 break; 1062 case IP6OPT_JUMBO: 1063 /* We do not support the Jumbo Payload option. */ 1064 goto bad; 1065 default: /* unknown option */ 1066 if (hbhlen < IP6OPT_MINLEN) { 1067 IP6STAT_INC(ip6s_toosmall); 1068 goto bad; 1069 } 1070 optlen = ip6_unknown_opt(opt, m, 1071 erroff + opt - opthead); 1072 if (optlen == -1) 1073 return (-1); 1074 optlen += 2; 1075 break; 1076 } 1077 } 1078 1079 return (0); 1080 1081 bad: 1082 m_freem(m); 1083 return (-1); 1084 } 1085 1086 /* 1087 * Unknown option processing. 1088 * The third argument `off' is the offset from the IPv6 header to the option, 1089 * which is necessary if the IPv6 header the and option header and IPv6 header 1090 * is not contiguous in order to return an ICMPv6 error. 1091 */ 1092 int 1093 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off) 1094 { 1095 struct ip6_hdr *ip6; 1096 1097 switch (IP6OPT_TYPE(*optp)) { 1098 case IP6OPT_TYPE_SKIP: /* ignore the option */ 1099 return ((int)*(optp + 1)); 1100 case IP6OPT_TYPE_DISCARD: /* silently discard */ 1101 m_freem(m); 1102 return (-1); 1103 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 1104 IP6STAT_INC(ip6s_badoptions); 1105 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 1106 return (-1); 1107 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 1108 IP6STAT_INC(ip6s_badoptions); 1109 ip6 = mtod(m, struct ip6_hdr *); 1110 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 1111 (m->m_flags & (M_BCAST|M_MCAST))) 1112 m_freem(m); 1113 else 1114 icmp6_error(m, ICMP6_PARAM_PROB, 1115 ICMP6_PARAMPROB_OPTION, off); 1116 return (-1); 1117 } 1118 1119 m_freem(m); /* XXX: NOTREACHED */ 1120 return (-1); 1121 } 1122 1123 /* 1124 * Create the "control" list for this pcb. 1125 * These functions will not modify mbuf chain at all. 1126 * 1127 * The routine will be called from upper layer handlers like tcp6_input(). 1128 * Thus the routine assumes that the caller (tcp6_input) have already 1129 * called m_pullup() and all the extension headers are located in the 1130 * very first mbuf on the mbuf chain. 1131 * 1132 * ip6_savecontrol_v4 will handle those options that are possible to be 1133 * set on a v4-mapped socket. 1134 * ip6_savecontrol will directly call ip6_savecontrol_v4 to handle those 1135 * options and handle the v6-only ones itself. 1136 */ 1137 struct mbuf ** 1138 ip6_savecontrol_v4(struct inpcb *inp, struct mbuf *m, struct mbuf **mp, 1139 int *v4only) 1140 { 1141 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1142 1143 #if defined(SO_TIMESTAMP) && defined(SO_BINTIME) 1144 if ((inp->inp_socket->so_options & (SO_TIMESTAMP | SO_BINTIME)) != 0) { 1145 union { 1146 struct timeval tv; 1147 struct bintime bt; 1148 struct timespec ts; 1149 } t; 1150 struct bintime boottimebin, bt1; 1151 struct timespec ts1; 1152 int ts_clock; 1153 bool stamped; 1154 1155 ts_clock = inp->inp_socket->so_ts_clock; 1156 stamped = false; 1157 1158 /* 1159 * Handle BINTIME first. We create the same output options 1160 * for both SO_BINTIME and the case where SO_TIMESTAMP is 1161 * set with the timestamp clock set to SO_TS_BINTIME. 1162 */ 1163 if ((inp->inp_socket->so_options & SO_BINTIME) != 0 || 1164 ts_clock == SO_TS_BINTIME) { 1165 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1166 M_TSTMP)) { 1167 mbuf_tstmp2timespec(m, &ts1); 1168 timespec2bintime(&ts1, &t.bt); 1169 getboottimebin(&boottimebin); 1170 bintime_add(&t.bt, &boottimebin); 1171 } else { 1172 bintime(&t.bt); 1173 } 1174 *mp = sbcreatecontrol(&t.bt, sizeof(t.bt), SCM_BINTIME, 1175 SOL_SOCKET, M_NOWAIT); 1176 if (*mp != NULL) { 1177 mp = &(*mp)->m_next; 1178 stamped = true; 1179 } 1180 1181 /* 1182 * Suppress other timestamps if SO_TIMESTAMP is not 1183 * set. 1184 */ 1185 if ((inp->inp_socket->so_options & SO_TIMESTAMP) == 0) 1186 ts_clock = SO_TS_BINTIME; 1187 } 1188 1189 switch (ts_clock) { 1190 case SO_TS_REALTIME_MICRO: 1191 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1192 M_TSTMP)) { 1193 mbuf_tstmp2timespec(m, &ts1); 1194 timespec2bintime(&ts1, &bt1); 1195 getboottimebin(&boottimebin); 1196 bintime_add(&bt1, &boottimebin); 1197 bintime2timeval(&bt1, &t.tv); 1198 } else { 1199 microtime(&t.tv); 1200 } 1201 *mp = sbcreatecontrol(&t.tv, sizeof(t.tv), 1202 SCM_TIMESTAMP, SOL_SOCKET, M_NOWAIT); 1203 if (*mp != NULL) { 1204 mp = &(*mp)->m_next; 1205 stamped = true; 1206 } 1207 break; 1208 1209 case SO_TS_BINTIME: 1210 break; 1211 1212 case SO_TS_REALTIME: 1213 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1214 M_TSTMP)) { 1215 mbuf_tstmp2timespec(m, &t.ts); 1216 getboottimebin(&boottimebin); 1217 bintime2timespec(&boottimebin, &ts1); 1218 timespecadd(&t.ts, &ts1, &t.ts); 1219 } else { 1220 nanotime(&t.ts); 1221 } 1222 *mp = sbcreatecontrol(&t.ts, sizeof(t.ts), 1223 SCM_REALTIME, SOL_SOCKET, M_NOWAIT); 1224 if (*mp != NULL) { 1225 mp = &(*mp)->m_next; 1226 stamped = true; 1227 } 1228 break; 1229 1230 case SO_TS_MONOTONIC: 1231 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1232 M_TSTMP)) 1233 mbuf_tstmp2timespec(m, &t.ts); 1234 else 1235 nanouptime(&t.ts); 1236 *mp = sbcreatecontrol(&t.ts, sizeof(t.ts), 1237 SCM_MONOTONIC, SOL_SOCKET, M_NOWAIT); 1238 if (*mp != NULL) { 1239 mp = &(*mp)->m_next; 1240 stamped = true; 1241 } 1242 break; 1243 1244 default: 1245 panic("unknown (corrupted) so_ts_clock"); 1246 } 1247 if (stamped && (m->m_flags & (M_PKTHDR | M_TSTMP)) == 1248 (M_PKTHDR | M_TSTMP)) { 1249 struct sock_timestamp_info sti; 1250 1251 bzero(&sti, sizeof(sti)); 1252 sti.st_info_flags = ST_INFO_HW; 1253 if ((m->m_flags & M_TSTMP_HPREC) != 0) 1254 sti.st_info_flags |= ST_INFO_HW_HPREC; 1255 *mp = sbcreatecontrol(&sti, sizeof(sti), SCM_TIME_INFO, 1256 SOL_SOCKET, M_NOWAIT); 1257 if (*mp != NULL) 1258 mp = &(*mp)->m_next; 1259 } 1260 } 1261 #endif 1262 1263 #define IS2292(inp, x, y) (((inp)->inp_flags & IN6P_RFC2292) ? (x) : (y)) 1264 /* RFC 2292 sec. 5 */ 1265 if ((inp->inp_flags & IN6P_PKTINFO) != 0) { 1266 struct in6_pktinfo pi6; 1267 1268 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1269 #ifdef INET 1270 struct ip *ip; 1271 1272 ip = mtod(m, struct ip *); 1273 pi6.ipi6_addr.s6_addr32[0] = 0; 1274 pi6.ipi6_addr.s6_addr32[1] = 0; 1275 pi6.ipi6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP; 1276 pi6.ipi6_addr.s6_addr32[3] = ip->ip_dst.s_addr; 1277 #else 1278 /* We won't hit this code */ 1279 bzero(&pi6.ipi6_addr, sizeof(struct in6_addr)); 1280 #endif 1281 } else { 1282 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr)); 1283 in6_clearscope(&pi6.ipi6_addr); /* XXX */ 1284 } 1285 pi6.ipi6_ifindex = 1286 (m && m->m_pkthdr.rcvif) ? m->m_pkthdr.rcvif->if_index : 0; 1287 1288 *mp = sbcreatecontrol(&pi6, sizeof(struct in6_pktinfo), 1289 IS2292(inp, IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6, 1290 M_NOWAIT); 1291 if (*mp) 1292 mp = &(*mp)->m_next; 1293 } 1294 1295 if ((inp->inp_flags & IN6P_HOPLIMIT) != 0) { 1296 int hlim; 1297 1298 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1299 #ifdef INET 1300 struct ip *ip; 1301 1302 ip = mtod(m, struct ip *); 1303 hlim = ip->ip_ttl; 1304 #else 1305 /* We won't hit this code */ 1306 hlim = 0; 1307 #endif 1308 } else { 1309 hlim = ip6->ip6_hlim & 0xff; 1310 } 1311 *mp = sbcreatecontrol(&hlim, sizeof(int), 1312 IS2292(inp, IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), 1313 IPPROTO_IPV6, M_NOWAIT); 1314 if (*mp) 1315 mp = &(*mp)->m_next; 1316 } 1317 1318 if ((inp->inp_flags & IN6P_TCLASS) != 0) { 1319 int tclass; 1320 1321 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1322 #ifdef INET 1323 struct ip *ip; 1324 1325 ip = mtod(m, struct ip *); 1326 tclass = ip->ip_tos; 1327 #else 1328 /* We won't hit this code */ 1329 tclass = 0; 1330 #endif 1331 } else { 1332 u_int32_t flowinfo; 1333 1334 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK); 1335 flowinfo >>= 20; 1336 tclass = flowinfo & 0xff; 1337 } 1338 *mp = sbcreatecontrol(&tclass, sizeof(int), IPV6_TCLASS, 1339 IPPROTO_IPV6, M_NOWAIT); 1340 if (*mp) 1341 mp = &(*mp)->m_next; 1342 } 1343 1344 if (v4only != NULL) { 1345 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1346 *v4only = 1; 1347 } else { 1348 *v4only = 0; 1349 } 1350 } 1351 1352 return (mp); 1353 } 1354 1355 void 1356 ip6_savecontrol(struct inpcb *inp, struct mbuf *m, struct mbuf **mp) 1357 { 1358 struct ip6_hdr *ip6; 1359 int v4only = 0; 1360 1361 mp = ip6_savecontrol_v4(inp, m, mp, &v4only); 1362 if (v4only) 1363 return; 1364 1365 ip6 = mtod(m, struct ip6_hdr *); 1366 /* 1367 * IPV6_HOPOPTS socket option. Recall that we required super-user 1368 * privilege for the option (see ip6_ctloutput), but it might be too 1369 * strict, since there might be some hop-by-hop options which can be 1370 * returned to normal user. 1371 * See also RFC 2292 section 6 (or RFC 3542 section 8). 1372 */ 1373 if ((inp->inp_flags & IN6P_HOPOPTS) != 0) { 1374 /* 1375 * Check if a hop-by-hop options header is contatined in the 1376 * received packet, and if so, store the options as ancillary 1377 * data. Note that a hop-by-hop options header must be 1378 * just after the IPv6 header, which is assured through the 1379 * IPv6 input processing. 1380 */ 1381 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 1382 struct ip6_hbh *hbh; 1383 u_int hbhlen; 1384 1385 hbh = (struct ip6_hbh *)(ip6 + 1); 1386 hbhlen = (hbh->ip6h_len + 1) << 3; 1387 1388 /* 1389 * XXX: We copy the whole header even if a 1390 * jumbo payload option is included, the option which 1391 * is to be removed before returning according to 1392 * RFC2292. 1393 * Note: this constraint is removed in RFC3542 1394 */ 1395 *mp = sbcreatecontrol(hbh, hbhlen, 1396 IS2292(inp, IPV6_2292HOPOPTS, IPV6_HOPOPTS), 1397 IPPROTO_IPV6, M_NOWAIT); 1398 if (*mp) 1399 mp = &(*mp)->m_next; 1400 } 1401 } 1402 1403 if ((inp->inp_flags & (IN6P_RTHDR | IN6P_DSTOPTS)) != 0) { 1404 int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr); 1405 1406 /* 1407 * Search for destination options headers or routing 1408 * header(s) through the header chain, and stores each 1409 * header as ancillary data. 1410 * Note that the order of the headers remains in 1411 * the chain of ancillary data. 1412 */ 1413 while (1) { /* is explicit loop prevention necessary? */ 1414 struct ip6_ext *ip6e = NULL; 1415 u_int elen; 1416 1417 /* 1418 * if it is not an extension header, don't try to 1419 * pull it from the chain. 1420 */ 1421 switch (nxt) { 1422 case IPPROTO_DSTOPTS: 1423 case IPPROTO_ROUTING: 1424 case IPPROTO_HOPOPTS: 1425 case IPPROTO_AH: /* is it possible? */ 1426 break; 1427 default: 1428 goto loopend; 1429 } 1430 1431 if (off + sizeof(*ip6e) > m->m_len) 1432 goto loopend; 1433 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off); 1434 if (nxt == IPPROTO_AH) 1435 elen = (ip6e->ip6e_len + 2) << 2; 1436 else 1437 elen = (ip6e->ip6e_len + 1) << 3; 1438 if (off + elen > m->m_len) 1439 goto loopend; 1440 1441 switch (nxt) { 1442 case IPPROTO_DSTOPTS: 1443 if (!(inp->inp_flags & IN6P_DSTOPTS)) 1444 break; 1445 1446 *mp = sbcreatecontrol(ip6e, elen, 1447 IS2292(inp, IPV6_2292DSTOPTS, IPV6_DSTOPTS), 1448 IPPROTO_IPV6, M_NOWAIT); 1449 if (*mp) 1450 mp = &(*mp)->m_next; 1451 break; 1452 case IPPROTO_ROUTING: 1453 if (!(inp->inp_flags & IN6P_RTHDR)) 1454 break; 1455 1456 *mp = sbcreatecontrol(ip6e, elen, 1457 IS2292(inp, IPV6_2292RTHDR, IPV6_RTHDR), 1458 IPPROTO_IPV6, M_NOWAIT); 1459 if (*mp) 1460 mp = &(*mp)->m_next; 1461 break; 1462 case IPPROTO_HOPOPTS: 1463 case IPPROTO_AH: /* is it possible? */ 1464 break; 1465 1466 default: 1467 /* 1468 * other cases have been filtered in the above. 1469 * none will visit this case. here we supply 1470 * the code just in case (nxt overwritten or 1471 * other cases). 1472 */ 1473 goto loopend; 1474 } 1475 1476 /* proceed with the next header. */ 1477 off += elen; 1478 nxt = ip6e->ip6e_nxt; 1479 ip6e = NULL; 1480 } 1481 loopend: 1482 ; 1483 } 1484 1485 if (inp->inp_flags2 & INP_RECVFLOWID) { 1486 uint32_t flowid, flow_type; 1487 1488 flowid = m->m_pkthdr.flowid; 1489 flow_type = M_HASHTYPE_GET(m); 1490 1491 /* 1492 * XXX should handle the failure of one or the 1493 * other - don't populate both? 1494 */ 1495 *mp = sbcreatecontrol(&flowid, sizeof(uint32_t), IPV6_FLOWID, 1496 IPPROTO_IPV6, M_NOWAIT); 1497 if (*mp) 1498 mp = &(*mp)->m_next; 1499 *mp = sbcreatecontrol(&flow_type, sizeof(uint32_t), 1500 IPV6_FLOWTYPE, IPPROTO_IPV6, M_NOWAIT); 1501 if (*mp) 1502 mp = &(*mp)->m_next; 1503 } 1504 1505 #ifdef RSS 1506 if (inp->inp_flags2 & INP_RECVRSSBUCKETID) { 1507 uint32_t flowid, flow_type; 1508 uint32_t rss_bucketid; 1509 1510 flowid = m->m_pkthdr.flowid; 1511 flow_type = M_HASHTYPE_GET(m); 1512 1513 if (rss_hash2bucket(flowid, flow_type, &rss_bucketid) == 0) { 1514 *mp = sbcreatecontrol(&rss_bucketid, sizeof(uint32_t), 1515 IPV6_RSSBUCKETID, IPPROTO_IPV6, M_NOWAIT); 1516 if (*mp) 1517 mp = &(*mp)->m_next; 1518 } 1519 } 1520 #endif 1521 1522 } 1523 #undef IS2292 1524 1525 void 1526 ip6_notify_pmtu(struct inpcb *inp, struct sockaddr_in6 *dst, u_int32_t mtu) 1527 { 1528 struct socket *so; 1529 struct mbuf *m_mtu; 1530 struct ip6_mtuinfo mtuctl; 1531 1532 KASSERT(inp != NULL, ("%s: inp == NULL", __func__)); 1533 /* 1534 * Notify the error by sending IPV6_PATHMTU ancillary data if 1535 * application wanted to know the MTU value. 1536 * NOTE: we notify disconnected sockets, because some udp 1537 * applications keep sending sockets disconnected. 1538 * NOTE: our implementation doesn't notify connected sockets that has 1539 * foreign address that is different than given destination addresses 1540 * (this is permitted by RFC 3542). 1541 */ 1542 if ((inp->inp_flags & IN6P_MTU) == 0 || ( 1543 !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 1544 !IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &dst->sin6_addr))) 1545 return; 1546 1547 mtuctl.ip6m_mtu = mtu; 1548 mtuctl.ip6m_addr = *dst; 1549 if (sa6_recoverscope(&mtuctl.ip6m_addr)) 1550 return; 1551 1552 if ((m_mtu = sbcreatecontrol(&mtuctl, sizeof(mtuctl), IPV6_PATHMTU, 1553 IPPROTO_IPV6, M_NOWAIT)) == NULL) 1554 return; 1555 1556 so = inp->inp_socket; 1557 if (sbappendaddr(&so->so_rcv, (struct sockaddr *)dst, NULL, m_mtu) 1558 == 0) { 1559 soroverflow(so); 1560 m_freem(m_mtu); 1561 /* XXX: should count statistics */ 1562 } else 1563 sorwakeup(so); 1564 } 1565 1566 /* 1567 * Get pointer to the previous header followed by the header 1568 * currently processed. 1569 */ 1570 int 1571 ip6_get_prevhdr(const struct mbuf *m, int off) 1572 { 1573 struct ip6_ext ip6e; 1574 struct ip6_hdr *ip6; 1575 int len, nlen, nxt; 1576 1577 if (off == sizeof(struct ip6_hdr)) 1578 return (offsetof(struct ip6_hdr, ip6_nxt)); 1579 if (off < sizeof(struct ip6_hdr)) 1580 panic("%s: off < sizeof(struct ip6_hdr)", __func__); 1581 1582 ip6 = mtod(m, struct ip6_hdr *); 1583 nxt = ip6->ip6_nxt; 1584 len = sizeof(struct ip6_hdr); 1585 nlen = 0; 1586 while (len < off) { 1587 m_copydata(m, len, sizeof(ip6e), (caddr_t)&ip6e); 1588 switch (nxt) { 1589 case IPPROTO_FRAGMENT: 1590 nlen = sizeof(struct ip6_frag); 1591 break; 1592 case IPPROTO_AH: 1593 nlen = (ip6e.ip6e_len + 2) << 2; 1594 break; 1595 default: 1596 nlen = (ip6e.ip6e_len + 1) << 3; 1597 } 1598 len += nlen; 1599 nxt = ip6e.ip6e_nxt; 1600 } 1601 return (len - nlen); 1602 } 1603 1604 /* 1605 * get next header offset. m will be retained. 1606 */ 1607 int 1608 ip6_nexthdr(const struct mbuf *m, int off, int proto, int *nxtp) 1609 { 1610 struct ip6_hdr ip6; 1611 struct ip6_ext ip6e; 1612 struct ip6_frag fh; 1613 1614 /* just in case */ 1615 if (m == NULL) 1616 panic("ip6_nexthdr: m == NULL"); 1617 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off) 1618 return -1; 1619 1620 switch (proto) { 1621 case IPPROTO_IPV6: 1622 if (m->m_pkthdr.len < off + sizeof(ip6)) 1623 return -1; 1624 m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6); 1625 if (nxtp) 1626 *nxtp = ip6.ip6_nxt; 1627 off += sizeof(ip6); 1628 return off; 1629 1630 case IPPROTO_FRAGMENT: 1631 /* 1632 * terminate parsing if it is not the first fragment, 1633 * it does not make sense to parse through it. 1634 */ 1635 if (m->m_pkthdr.len < off + sizeof(fh)) 1636 return -1; 1637 m_copydata(m, off, sizeof(fh), (caddr_t)&fh); 1638 /* IP6F_OFF_MASK = 0xfff8(BigEndian), 0xf8ff(LittleEndian) */ 1639 if (fh.ip6f_offlg & IP6F_OFF_MASK) 1640 return -1; 1641 if (nxtp) 1642 *nxtp = fh.ip6f_nxt; 1643 off += sizeof(struct ip6_frag); 1644 return off; 1645 1646 case IPPROTO_AH: 1647 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1648 return -1; 1649 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1650 if (nxtp) 1651 *nxtp = ip6e.ip6e_nxt; 1652 off += (ip6e.ip6e_len + 2) << 2; 1653 return off; 1654 1655 case IPPROTO_HOPOPTS: 1656 case IPPROTO_ROUTING: 1657 case IPPROTO_DSTOPTS: 1658 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1659 return -1; 1660 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1661 if (nxtp) 1662 *nxtp = ip6e.ip6e_nxt; 1663 off += (ip6e.ip6e_len + 1) << 3; 1664 return off; 1665 1666 case IPPROTO_NONE: 1667 case IPPROTO_ESP: 1668 case IPPROTO_IPCOMP: 1669 /* give up */ 1670 return -1; 1671 1672 default: 1673 return -1; 1674 } 1675 1676 /* NOTREACHED */ 1677 } 1678 1679 /* 1680 * get offset for the last header in the chain. m will be kept untainted. 1681 */ 1682 int 1683 ip6_lasthdr(const struct mbuf *m, int off, int proto, int *nxtp) 1684 { 1685 int newoff; 1686 int nxt; 1687 1688 if (!nxtp) { 1689 nxt = -1; 1690 nxtp = &nxt; 1691 } 1692 while (1) { 1693 newoff = ip6_nexthdr(m, off, proto, nxtp); 1694 if (newoff < 0) 1695 return off; 1696 else if (newoff < off) 1697 return -1; /* invalid */ 1698 else if (newoff == off) 1699 return newoff; 1700 1701 off = newoff; 1702 proto = *nxtp; 1703 } 1704 } 1705