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 * @(#)ip_input.c 8.2 (Berkeley) 1/4/94 63 */ 64 65 #include <sys/cdefs.h> 66 __FBSDID("$FreeBSD$"); 67 68 #include "opt_inet.h" 69 #include "opt_inet6.h" 70 #include "opt_ipsec.h" 71 #include "opt_route.h" 72 #include "opt_rss.h" 73 #include "opt_sctp.h" 74 75 #include <sys/param.h> 76 #include <sys/systm.h> 77 #include <sys/hhook.h> 78 #include <sys/malloc.h> 79 #include <sys/mbuf.h> 80 #include <sys/proc.h> 81 #include <sys/domain.h> 82 #include <sys/protosw.h> 83 #include <sys/sdt.h> 84 #include <sys/socket.h> 85 #include <sys/socketvar.h> 86 #include <sys/errno.h> 87 #include <sys/time.h> 88 #include <sys/kernel.h> 89 #include <sys/lock.h> 90 #include <sys/rmlock.h> 91 #include <sys/syslog.h> 92 #include <sys/sysctl.h> 93 #include <sys/eventhandler.h> 94 95 #include <net/if.h> 96 #include <net/if_var.h> 97 #include <net/if_types.h> 98 #include <net/if_private.h> 99 #include <net/if_dl.h> 100 #include <net/route.h> 101 #include <net/netisr.h> 102 #include <net/rss_config.h> 103 #include <net/pfil.h> 104 #include <net/vnet.h> 105 106 #include <netinet/in.h> 107 #include <netinet/in_kdtrace.h> 108 #include <netinet/ip_var.h> 109 #include <netinet/in_systm.h> 110 #include <net/if_llatbl.h> 111 #ifdef INET 112 #include <netinet/ip.h> 113 #include <netinet/ip_icmp.h> 114 #endif /* INET */ 115 #include <netinet/ip6.h> 116 #include <netinet6/in6_var.h> 117 #include <netinet6/ip6_var.h> 118 #include <netinet/ip_encap.h> 119 #include <netinet/in_pcb.h> 120 #include <netinet/icmp6.h> 121 #include <netinet6/scope6_var.h> 122 #include <netinet6/in6_ifattach.h> 123 #include <netinet6/mld6_var.h> 124 #include <netinet6/nd6.h> 125 #include <netinet6/in6_rss.h> 126 #ifdef SCTP 127 #include <netinet/sctp_pcb.h> 128 #include <netinet6/sctp6_var.h> 129 #endif 130 131 #include <netipsec/ipsec_support.h> 132 133 ip6proto_input_t *ip6_protox[IPPROTO_MAX] = { 134 [0 ... IPPROTO_MAX - 1] = rip6_input }; 135 ip6proto_ctlinput_t *ip6_ctlprotox[IPPROTO_MAX] = { 136 [0 ... IPPROTO_MAX - 1] = rip6_ctlinput }; 137 138 VNET_DEFINE(struct in6_ifaddrhead, in6_ifaddrhead); 139 VNET_DEFINE(struct in6_ifaddrlisthead *, in6_ifaddrhashtbl); 140 VNET_DEFINE(u_long, in6_ifaddrhmask); 141 142 static struct netisr_handler ip6_nh = { 143 .nh_name = "ip6", 144 .nh_handler = ip6_input, 145 .nh_proto = NETISR_IPV6, 146 #ifdef RSS 147 .nh_m2cpuid = rss_soft_m2cpuid_v6, 148 .nh_policy = NETISR_POLICY_CPU, 149 .nh_dispatch = NETISR_DISPATCH_HYBRID, 150 #else 151 .nh_policy = NETISR_POLICY_FLOW, 152 #endif 153 }; 154 155 static int 156 sysctl_netinet6_intr_queue_maxlen(SYSCTL_HANDLER_ARGS) 157 { 158 int error, qlimit; 159 160 netisr_getqlimit(&ip6_nh, &qlimit); 161 error = sysctl_handle_int(oidp, &qlimit, 0, req); 162 if (error || !req->newptr) 163 return (error); 164 if (qlimit < 1) 165 return (EINVAL); 166 return (netisr_setqlimit(&ip6_nh, qlimit)); 167 } 168 SYSCTL_DECL(_net_inet6_ip6); 169 SYSCTL_PROC(_net_inet6_ip6, IPV6CTL_INTRQMAXLEN, intr_queue_maxlen, 170 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 171 0, 0, sysctl_netinet6_intr_queue_maxlen, "I", 172 "Maximum size of the IPv6 input queue"); 173 174 VNET_DEFINE_STATIC(bool, ip6_sav) = true; 175 #define V_ip6_sav VNET(ip6_sav) 176 SYSCTL_BOOL(_net_inet6_ip6, OID_AUTO, source_address_validation, 177 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip6_sav), true, 178 "Drop incoming packets with source address that is a local address"); 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); 211 212 VNET_PCPUSTAT_DEFINE(struct ip6stat, ip6stat); 213 VNET_PCPUSTAT_SYSINIT(ip6stat); 214 #ifdef VIMAGE 215 VNET_PCPUSTAT_SYSUNINIT(ip6stat); 216 #endif /* VIMAGE */ 217 218 struct rmlock in6_ifaddr_lock; 219 RM_SYSINIT(in6_ifaddr_lock, &in6_ifaddr_lock, "in6_ifaddr_lock"); 220 221 static int ip6_hopopts_input(u_int32_t *, u_int32_t *, struct mbuf **, int *); 222 223 /* 224 * IP6 initialization: fill in IP6 protocol switch table. 225 * All protocols not implemented in kernel go to raw IP6 protocol handler. 226 */ 227 static void 228 ip6_vnet_init(void *arg __unused) 229 { 230 struct pfil_head_args args; 231 232 TUNABLE_INT_FETCH("net.inet6.ip6.auto_linklocal", 233 &V_ip6_auto_linklocal); 234 TUNABLE_INT_FETCH("net.inet6.ip6.accept_rtadv", &V_ip6_accept_rtadv); 235 TUNABLE_INT_FETCH("net.inet6.ip6.no_radr", &V_ip6_no_radr); 236 237 CK_STAILQ_INIT(&V_in6_ifaddrhead); 238 V_in6_ifaddrhashtbl = hashinit(IN6ADDR_NHASH, M_IFADDR, 239 &V_in6_ifaddrhmask); 240 241 /* Initialize packet filter hooks. */ 242 args.pa_version = PFIL_VERSION; 243 args.pa_flags = PFIL_IN | PFIL_OUT; 244 args.pa_type = PFIL_TYPE_IP6; 245 args.pa_headname = PFIL_INET6_NAME; 246 V_inet6_pfil_head = pfil_head_register(&args); 247 248 if (hhook_head_register(HHOOK_TYPE_IPSEC_IN, AF_INET6, 249 &V_ipsec_hhh_in[HHOOK_IPSEC_INET6], 250 HHOOK_WAITOK | HHOOK_HEADISINVNET) != 0) 251 printf("%s: WARNING: unable to register input helper hook\n", 252 __func__); 253 if (hhook_head_register(HHOOK_TYPE_IPSEC_OUT, AF_INET6, 254 &V_ipsec_hhh_out[HHOOK_IPSEC_INET6], 255 HHOOK_WAITOK | HHOOK_HEADISINVNET) != 0) 256 printf("%s: WARNING: unable to register output helper hook\n", 257 __func__); 258 259 scope6_init(); 260 addrsel_policy_init(); 261 nd6_init(); 262 frag6_init(); 263 264 V_ip6_desync_factor = arc4random() % MAX_TEMP_DESYNC_FACTOR; 265 266 /* Skip global initialization stuff for non-default instances. */ 267 #ifdef VIMAGE 268 netisr_register_vnet(&ip6_nh); 269 #ifdef RSS 270 netisr_register_vnet(&ip6_direct_nh); 271 #endif 272 #endif 273 } 274 VNET_SYSINIT(ip6_vnet_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH, 275 ip6_vnet_init, NULL); 276 277 static void 278 ip6_init(void *arg __unused) 279 { 280 281 /* 282 * Register statically those protocols that are unlikely to ever go 283 * dynamic. 284 */ 285 IP6PROTO_REGISTER(IPPROTO_ICMPV6, icmp6_input, rip6_ctlinput); 286 IP6PROTO_REGISTER(IPPROTO_DSTOPTS, dest6_input, NULL); 287 IP6PROTO_REGISTER(IPPROTO_ROUTING, route6_input, NULL); 288 IP6PROTO_REGISTER(IPPROTO_FRAGMENT, frag6_input, NULL); 289 IP6PROTO_REGISTER(IPPROTO_IPV4, encap6_input, NULL); 290 IP6PROTO_REGISTER(IPPROTO_IPV6, encap6_input, NULL); 291 IP6PROTO_REGISTER(IPPROTO_ETHERIP, encap6_input, NULL); 292 IP6PROTO_REGISTER(IPPROTO_GRE, encap6_input, NULL); 293 IP6PROTO_REGISTER(IPPROTO_PIM, encap6_input, NULL); 294 #ifdef SCTP /* XXX: has a loadable & static version */ 295 IP6PROTO_REGISTER(IPPROTO_SCTP, sctp6_input, sctp6_ctlinput); 296 #endif 297 298 EVENTHANDLER_REGISTER(vm_lowmem, frag6_drain, NULL, LOWMEM_PRI_DEFAULT); 299 EVENTHANDLER_REGISTER(mbuf_lowmem, frag6_drain, NULL, 300 LOWMEM_PRI_DEFAULT); 301 302 netisr_register(&ip6_nh); 303 #ifdef RSS 304 netisr_register(&ip6_direct_nh); 305 #endif 306 } 307 SYSINIT(ip6_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, ip6_init, NULL); 308 309 int 310 ip6proto_register(uint8_t proto, ip6proto_input_t input, 311 ip6proto_ctlinput_t ctl) 312 { 313 314 MPASS(proto > 0); 315 316 if (ip6_protox[proto] == rip6_input) { 317 ip6_protox[proto] = input; 318 ip6_ctlprotox[proto] = ctl; 319 return (0); 320 } else 321 return (EEXIST); 322 } 323 324 int 325 ip6proto_unregister(uint8_t proto) 326 { 327 328 MPASS(proto > 0); 329 330 if (ip6_protox[proto] != rip6_input) { 331 ip6_protox[proto] = rip6_input; 332 ip6_ctlprotox[proto] = rip6_ctlinput; 333 return (0); 334 } else 335 return (ENOENT); 336 } 337 338 #ifdef VIMAGE 339 static void 340 ip6_destroy(void *unused __unused) 341 { 342 struct ifaddr *ifa, *nifa; 343 struct ifnet *ifp; 344 int error; 345 346 #ifdef RSS 347 netisr_unregister_vnet(&ip6_direct_nh); 348 #endif 349 netisr_unregister_vnet(&ip6_nh); 350 351 pfil_head_unregister(V_inet6_pfil_head); 352 error = hhook_head_deregister(V_ipsec_hhh_in[HHOOK_IPSEC_INET6]); 353 if (error != 0) { 354 printf("%s: WARNING: unable to deregister input helper hook " 355 "type HHOOK_TYPE_IPSEC_IN, id HHOOK_IPSEC_INET6: " 356 "error %d returned\n", __func__, error); 357 } 358 error = hhook_head_deregister(V_ipsec_hhh_out[HHOOK_IPSEC_INET6]); 359 if (error != 0) { 360 printf("%s: WARNING: unable to deregister output helper hook " 361 "type HHOOK_TYPE_IPSEC_OUT, id HHOOK_IPSEC_INET6: " 362 "error %d returned\n", __func__, error); 363 } 364 365 /* Cleanup addresses. */ 366 IFNET_RLOCK(); 367 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 368 /* Cannot lock here - lock recursion. */ 369 /* IF_ADDR_LOCK(ifp); */ 370 CK_STAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, nifa) { 371 if (ifa->ifa_addr->sa_family != AF_INET6) 372 continue; 373 in6_purgeaddr(ifa); 374 } 375 /* IF_ADDR_UNLOCK(ifp); */ 376 in6_ifdetach_destroy(ifp); 377 mld_domifdetach(ifp); 378 } 379 IFNET_RUNLOCK(); 380 381 /* Make sure any routes are gone as well. */ 382 rib_flush_routes_family(AF_INET6); 383 384 frag6_destroy(); 385 nd6_destroy(); 386 in6_ifattach_destroy(); 387 388 hashdestroy(V_in6_ifaddrhashtbl, M_IFADDR, V_in6_ifaddrhmask); 389 } 390 391 VNET_SYSUNINIT(inet6, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, ip6_destroy, NULL); 392 #endif 393 394 static int 395 ip6_input_hbh(struct mbuf **mp, uint32_t *plen, uint32_t *rtalert, int *off, 396 int *nxt, int *ours) 397 { 398 struct mbuf *m; 399 struct ip6_hdr *ip6; 400 struct ip6_hbh *hbh; 401 402 if (ip6_hopopts_input(plen, rtalert, mp, off)) { 403 #if 0 /*touches NULL pointer*/ 404 in6_ifstat_inc((*mp)->m_pkthdr.rcvif, ifs6_in_discard); 405 #endif 406 goto out; /* m have already been freed */ 407 } 408 409 /* adjust pointer */ 410 m = *mp; 411 ip6 = mtod(m, struct ip6_hdr *); 412 413 /* 414 * if the payload length field is 0 and the next header field 415 * indicates Hop-by-Hop Options header, then a Jumbo Payload 416 * option MUST be included. 417 */ 418 if (ip6->ip6_plen == 0 && *plen == 0) { 419 /* 420 * Note that if a valid jumbo payload option is 421 * contained, ip6_hopopts_input() must set a valid 422 * (non-zero) payload length to the variable plen. 423 */ 424 IP6STAT_INC(ip6s_badoptions); 425 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 426 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 427 icmp6_error(m, ICMP6_PARAM_PROB, 428 ICMP6_PARAMPROB_HEADER, 429 (caddr_t)&ip6->ip6_plen - (caddr_t)ip6); 430 goto out; 431 } 432 /* ip6_hopopts_input() ensures that mbuf is contiguous */ 433 hbh = (struct ip6_hbh *)(ip6 + 1); 434 *nxt = hbh->ip6h_nxt; 435 436 /* 437 * If we are acting as a router and the packet contains a 438 * router alert option, see if we know the option value. 439 * Currently, we only support the option value for MLD, in which 440 * case we should pass the packet to the multicast routing 441 * daemon. 442 */ 443 if (*rtalert != ~0) { 444 switch (*rtalert) { 445 case IP6OPT_RTALERT_MLD: 446 if (V_ip6_forwarding) 447 *ours = 1; 448 break; 449 default: 450 /* 451 * RFC2711 requires unrecognized values must be 452 * silently ignored. 453 */ 454 break; 455 } 456 } 457 458 return (0); 459 460 out: 461 return (1); 462 } 463 464 #ifdef RSS 465 /* 466 * IPv6 direct input routine. 467 * 468 * This is called when reinjecting completed fragments where 469 * all of the previous checking and book-keeping has been done. 470 */ 471 void 472 ip6_direct_input(struct mbuf *m) 473 { 474 int off, nxt; 475 int nest; 476 struct m_tag *mtag; 477 struct ip6_direct_ctx *ip6dc; 478 479 mtag = m_tag_locate(m, MTAG_ABI_IPV6, IPV6_TAG_DIRECT, NULL); 480 KASSERT(mtag != NULL, ("Reinjected packet w/o direct ctx tag!")); 481 482 ip6dc = (struct ip6_direct_ctx *)(mtag + 1); 483 nxt = ip6dc->ip6dc_nxt; 484 off = ip6dc->ip6dc_off; 485 486 nest = 0; 487 488 m_tag_delete(m, mtag); 489 490 while (nxt != IPPROTO_DONE) { 491 if (V_ip6_hdrnestlimit && (++nest > V_ip6_hdrnestlimit)) { 492 IP6STAT_INC(ip6s_toomanyhdr); 493 goto bad; 494 } 495 496 /* 497 * protection against faulty packet - there should be 498 * more sanity checks in header chain processing. 499 */ 500 if (m->m_pkthdr.len < off) { 501 IP6STAT_INC(ip6s_tooshort); 502 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 503 goto bad; 504 } 505 506 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 507 if (IPSEC_ENABLED(ipv6)) { 508 if (IPSEC_INPUT(ipv6, m, off, nxt) != 0) 509 return; 510 } 511 #endif /* IPSEC */ 512 513 nxt = ip6_protox[nxt](&m, &off, nxt); 514 } 515 return; 516 bad: 517 m_freem(m); 518 } 519 #endif 520 521 void 522 ip6_input(struct mbuf *m) 523 { 524 struct in6_addr odst; 525 struct ip6_hdr *ip6; 526 struct in6_ifaddr *ia; 527 struct ifnet *rcvif; 528 u_int32_t plen; 529 u_int32_t rtalert = ~0; 530 int off = sizeof(struct ip6_hdr), nest; 531 int nxt, ours = 0; 532 int srcrt = 0; 533 534 /* 535 * Drop the packet if IPv6 operation is disabled on the interface. 536 */ 537 rcvif = m->m_pkthdr.rcvif; 538 if ((ND_IFINFO(rcvif)->flags & ND6_IFF_IFDISABLED)) 539 goto bad; 540 541 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 542 /* 543 * should the inner packet be considered authentic? 544 * see comment in ah4_input(). 545 * NB: m cannot be NULL when passed to the input routine 546 */ 547 548 m->m_flags &= ~M_AUTHIPHDR; 549 m->m_flags &= ~M_AUTHIPDGM; 550 551 #endif /* IPSEC */ 552 553 if (m->m_flags & M_FASTFWD_OURS) { 554 /* 555 * Firewall changed destination to local. 556 */ 557 ip6 = mtod(m, struct ip6_hdr *); 558 goto passin; 559 } 560 561 /* 562 * mbuf statistics 563 */ 564 if (m->m_flags & M_EXT) { 565 if (m->m_next) 566 IP6STAT_INC(ip6s_mext2m); 567 else 568 IP6STAT_INC(ip6s_mext1); 569 } else { 570 if (m->m_next) { 571 struct ifnet *ifp = (m->m_flags & M_LOOP) ? V_loif : rcvif; 572 int ifindex = ifp->if_index; 573 if (ifindex >= IP6S_M2MMAX) 574 ifindex = 0; 575 IP6STAT_INC(ip6s_m2m[ifindex]); 576 } else 577 IP6STAT_INC(ip6s_m1); 578 } 579 580 in6_ifstat_inc(rcvif, ifs6_in_receive); 581 IP6STAT_INC(ip6s_total); 582 583 /* 584 * L2 bridge code and some other code can return mbuf chain 585 * that does not conform to KAME requirement. too bad. 586 * XXX: fails to join if interface MTU > MCLBYTES. jumbogram? 587 */ 588 if (m && m->m_next != NULL && m->m_pkthdr.len < MCLBYTES) { 589 struct mbuf *n; 590 591 if (m->m_pkthdr.len > MHLEN) 592 n = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 593 else 594 n = m_gethdr(M_NOWAIT, MT_DATA); 595 if (n == NULL) 596 goto bad; 597 598 m_move_pkthdr(n, m); 599 m_copydata(m, 0, n->m_pkthdr.len, mtod(n, caddr_t)); 600 n->m_len = n->m_pkthdr.len; 601 m_freem(m); 602 m = n; 603 } 604 if (m->m_len < sizeof(struct ip6_hdr)) { 605 if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 606 IP6STAT_INC(ip6s_toosmall); 607 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 608 goto bad; 609 } 610 } 611 612 ip6 = mtod(m, struct ip6_hdr *); 613 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 614 IP6STAT_INC(ip6s_badvers); 615 in6_ifstat_inc(rcvif, ifs6_in_hdrerr); 616 goto bad; 617 } 618 619 IP6STAT_INC(ip6s_nxthist[ip6->ip6_nxt]); 620 IP_PROBE(receive, NULL, NULL, ip6, rcvif, NULL, ip6); 621 622 /* 623 * Check against address spoofing/corruption. 624 */ 625 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) || 626 IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) { 627 /* 628 * XXX: "badscope" is not very suitable for a multicast source. 629 */ 630 IP6STAT_INC(ip6s_badscope); 631 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 632 goto bad; 633 } 634 if (IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) && 635 !(m->m_flags & M_LOOP)) { 636 /* 637 * In this case, the packet should come from the loopback 638 * interface. However, we cannot just check the if_flags, 639 * because ip6_mloopback() passes the "actual" interface 640 * as the outgoing/incoming interface. 641 */ 642 IP6STAT_INC(ip6s_badscope); 643 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 644 goto bad; 645 } 646 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && 647 IPV6_ADDR_MC_SCOPE(&ip6->ip6_dst) == 0) { 648 /* 649 * RFC4291 2.7: 650 * Nodes must not originate a packet to a multicast address 651 * whose scop field contains the reserved value 0; if such 652 * a packet is received, it must be silently dropped. 653 */ 654 IP6STAT_INC(ip6s_badscope); 655 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 656 goto bad; 657 } 658 /* 659 * The following check is not documented in specs. A malicious 660 * party may be able to use IPv4 mapped addr to confuse tcp/udp stack 661 * and bypass security checks (act as if it was from 127.0.0.1 by using 662 * IPv6 src ::ffff:127.0.0.1). Be cautious. 663 * 664 * We have supported IPv6-only kernels for a few years and this issue 665 * has not come up. The world seems to move mostly towards not using 666 * v4mapped on the wire, so it makes sense for us to keep rejecting 667 * any such packets. 668 */ 669 if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 670 IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 671 IP6STAT_INC(ip6s_badscope); 672 in6_ifstat_inc(rcvif, ifs6_in_addrerr); 673 goto bad; 674 } 675 #if 0 676 /* 677 * Reject packets with IPv4 compatible addresses (auto tunnel). 678 * 679 * The code forbids auto tunnel relay case in RFC1933 (the check is 680 * stronger than RFC1933). We may want to re-enable it if mech-xx 681 * is revised to forbid relaying case. 682 */ 683 if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) || 684 IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) { 685 IP6STAT_INC(ip6s_badscope); 686 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 687 goto bad; 688 } 689 #endif 690 /* 691 * Try to forward the packet, but if we fail continue. 692 * ip6_tryforward() does not generate redirects, so fall 693 * through to normal processing if redirects are required. 694 * ip6_tryforward() does inbound and outbound packet firewall 695 * processing. If firewall has decided that destination becomes 696 * our local address, it sets M_FASTFWD_OURS flag. In this 697 * case skip another inbound firewall processing and update 698 * ip6 pointer. 699 */ 700 if (V_ip6_forwarding != 0 && V_ip6_sendredirects == 0 701 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 702 && (!IPSEC_ENABLED(ipv6) || 703 IPSEC_CAPS(ipv6, m, IPSEC_CAP_OPERABLE) == 0) 704 #endif 705 ) { 706 if ((m = ip6_tryforward(m)) == NULL) 707 return; 708 if (m->m_flags & M_FASTFWD_OURS) { 709 ip6 = mtod(m, struct ip6_hdr *); 710 goto passin; 711 } 712 } 713 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 714 /* 715 * Bypass packet filtering for packets previously handled by IPsec. 716 */ 717 if (IPSEC_ENABLED(ipv6) && 718 IPSEC_CAPS(ipv6, m, IPSEC_CAP_BYPASS_FILTER) != 0) 719 goto passin; 720 #endif 721 /* 722 * Run through list of hooks for input packets. 723 * 724 * NB: Beware of the destination address changing 725 * (e.g. by NAT rewriting). When this happens, 726 * tell ip6_forward to do the right thing. 727 */ 728 729 /* Jump over all PFIL processing if hooks are not active. */ 730 if (!PFIL_HOOKED_IN(V_inet6_pfil_head)) 731 goto passin; 732 733 odst = ip6->ip6_dst; 734 if (pfil_mbuf_in(V_inet6_pfil_head, &m, m->m_pkthdr.rcvif, 735 NULL) != PFIL_PASS) 736 return; 737 ip6 = mtod(m, struct ip6_hdr *); 738 srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst); 739 if ((m->m_flags & (M_IP6_NEXTHOP | M_FASTFWD_OURS)) == M_IP6_NEXTHOP && 740 m_tag_find(m, PACKET_TAG_IPFORWARD, NULL) != NULL) { 741 /* 742 * Directly ship the packet on. This allows forwarding 743 * packets originally destined to us to some other directly 744 * connected host. 745 */ 746 ip6_forward(m, 1); 747 return; 748 } 749 750 passin: 751 /* 752 * Disambiguate address scope zones (if there is ambiguity). 753 * We first make sure that the original source or destination address 754 * is not in our internal form for scoped addresses. Such addresses 755 * are not necessarily invalid spec-wise, but we cannot accept them due 756 * to the usage conflict. 757 * in6_setscope() then also checks and rejects the cases where src or 758 * dst are the loopback address and the receiving interface 759 * is not loopback. 760 */ 761 if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) { 762 IP6STAT_INC(ip6s_badscope); /* XXX */ 763 goto bad; 764 } 765 if (in6_setscope(&ip6->ip6_src, rcvif, NULL) || 766 in6_setscope(&ip6->ip6_dst, rcvif, NULL)) { 767 IP6STAT_INC(ip6s_badscope); 768 goto bad; 769 } 770 if (m->m_flags & M_FASTFWD_OURS) { 771 m->m_flags &= ~M_FASTFWD_OURS; 772 ours = 1; 773 goto hbhcheck; 774 } 775 /* 776 * Multicast check. Assume packet is for us to avoid 777 * prematurely taking locks. 778 */ 779 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 780 ours = 1; 781 in6_ifstat_inc(rcvif, ifs6_in_mcast); 782 goto hbhcheck; 783 } 784 /* 785 * Unicast check 786 * XXX: For now we keep link-local IPv6 addresses with embedded 787 * scope zone id, therefore we use zero zoneid here. 788 */ 789 ia = in6ifa_ifwithaddr(&ip6->ip6_dst, 0 /* XXX */, false); 790 if (ia != NULL) { 791 if (ia->ia6_flags & IN6_IFF_NOTREADY) { 792 char ip6bufs[INET6_ADDRSTRLEN]; 793 char ip6bufd[INET6_ADDRSTRLEN]; 794 /* address is not ready, so discard the packet. */ 795 nd6log((LOG_INFO, 796 "ip6_input: packet to an unready address %s->%s\n", 797 ip6_sprintf(ip6bufs, &ip6->ip6_src), 798 ip6_sprintf(ip6bufd, &ip6->ip6_dst))); 799 goto bad; 800 } 801 if (V_ip6_sav && !(m->m_flags & M_LOOP) && 802 __predict_false(in6_localip_fib(&ip6->ip6_src, 803 rcvif->if_fib))) { 804 IP6STAT_INC(ip6s_badscope); /* XXX */ 805 goto bad; 806 } 807 /* Count the packet in the ip address stats */ 808 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1); 809 counter_u64_add(ia->ia_ifa.ifa_ibytes, m->m_pkthdr.len); 810 ours = 1; 811 goto hbhcheck; 812 } 813 814 /* 815 * Now there is no reason to process the packet if it's not our own 816 * and we're not a router. 817 */ 818 if (!V_ip6_forwarding) { 819 IP6STAT_INC(ip6s_cantforward); 820 goto bad; 821 } 822 823 hbhcheck: 824 /* 825 * Process Hop-by-Hop options header if it's contained. 826 * m may be modified in ip6_hopopts_input(). 827 * If a JumboPayload option is included, plen will also be modified. 828 */ 829 plen = (u_int32_t)ntohs(ip6->ip6_plen); 830 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 831 if (ip6_input_hbh(&m, &plen, &rtalert, &off, &nxt, &ours) != 0) 832 return; 833 } else 834 nxt = ip6->ip6_nxt; 835 836 /* 837 * Use mbuf flags to propagate Router Alert option to 838 * ICMPv6 layer, as hop-by-hop options have been stripped. 839 */ 840 if (rtalert != ~0) 841 m->m_flags |= M_RTALERT_MLD; 842 843 /* 844 * Check that the amount of data in the buffers 845 * is as at least much as the IPv6 header would have us expect. 846 * Trim mbufs if longer than we expect. 847 * Drop packet if shorter than we expect. 848 */ 849 if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 850 IP6STAT_INC(ip6s_tooshort); 851 in6_ifstat_inc(rcvif, ifs6_in_truncated); 852 goto bad; 853 } 854 if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 855 if (m->m_len == m->m_pkthdr.len) { 856 m->m_len = sizeof(struct ip6_hdr) + plen; 857 m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 858 } else 859 m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 860 } 861 862 /* 863 * Forward if desirable. 864 */ 865 if (V_ip6_mrouter && 866 IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 867 /* 868 * If we are acting as a multicast router, all 869 * incoming multicast packets are passed to the 870 * kernel-level multicast forwarding function. 871 * The packet is returned (relatively) intact; if 872 * ip6_mforward() returns a non-zero value, the packet 873 * must be discarded, else it may be accepted below. 874 * 875 * XXX TODO: Check hlim and multicast scope here to avoid 876 * unnecessarily calling into ip6_mforward(). 877 */ 878 if (ip6_mforward && ip6_mforward(ip6, rcvif, m)) { 879 IP6STAT_INC(ip6s_cantforward); 880 goto bad; 881 } 882 } else if (!ours) { 883 ip6_forward(m, srcrt); 884 return; 885 } 886 887 /* 888 * Tell launch routine the next header 889 */ 890 IP6STAT_INC(ip6s_delivered); 891 in6_ifstat_inc(rcvif, ifs6_in_deliver); 892 nest = 0; 893 894 while (nxt != IPPROTO_DONE) { 895 if (V_ip6_hdrnestlimit && (++nest > V_ip6_hdrnestlimit)) { 896 IP6STAT_INC(ip6s_toomanyhdr); 897 goto bad; 898 } 899 900 /* 901 * protection against faulty packet - there should be 902 * more sanity checks in header chain processing. 903 */ 904 if (m->m_pkthdr.len < off) { 905 IP6STAT_INC(ip6s_tooshort); 906 in6_ifstat_inc(rcvif, ifs6_in_truncated); 907 goto bad; 908 } 909 910 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 911 if (IPSEC_ENABLED(ipv6)) { 912 if (IPSEC_INPUT(ipv6, m, off, nxt) != 0) 913 return; 914 } 915 #endif /* IPSEC */ 916 917 nxt = ip6_protox[nxt](&m, &off, nxt); 918 } 919 return; 920 bad: 921 in6_ifstat_inc(rcvif, ifs6_in_discard); 922 if (m != NULL) 923 m_freem(m); 924 } 925 926 /* 927 * Hop-by-Hop options header processing. If a valid jumbo payload option is 928 * included, the real payload length will be stored in plenp. 929 * 930 * rtalertp - XXX: should be stored more smart way 931 */ 932 static int 933 ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp, 934 struct mbuf **mp, int *offp) 935 { 936 struct mbuf *m = *mp; 937 int off = *offp, hbhlen; 938 struct ip6_hbh *hbh; 939 940 /* validation of the length of the header */ 941 if (m->m_len < off + sizeof(*hbh)) { 942 m = m_pullup(m, off + sizeof(*hbh)); 943 if (m == NULL) { 944 IP6STAT_INC(ip6s_exthdrtoolong); 945 *mp = NULL; 946 return (-1); 947 } 948 } 949 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); 950 hbhlen = (hbh->ip6h_len + 1) << 3; 951 952 if (m->m_len < off + hbhlen) { 953 m = m_pullup(m, off + hbhlen); 954 if (m == NULL) { 955 IP6STAT_INC(ip6s_exthdrtoolong); 956 *mp = NULL; 957 return (-1); 958 } 959 } 960 hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); 961 off += hbhlen; 962 hbhlen -= sizeof(struct ip6_hbh); 963 if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 964 hbhlen, rtalertp, plenp) < 0) { 965 *mp = NULL; 966 return (-1); 967 } 968 969 *offp = off; 970 *mp = m; 971 return (0); 972 } 973 974 /* 975 * Search header for all Hop-by-hop options and process each option. 976 * This function is separate from ip6_hopopts_input() in order to 977 * handle a case where the sending node itself process its hop-by-hop 978 * options header. In such a case, the function is called from ip6_output(). 979 * 980 * The function assumes that hbh header is located right after the IPv6 header 981 * (RFC2460 p7), opthead is pointer into data content in m, and opthead to 982 * opthead + hbhlen is located in contiguous memory region. 983 */ 984 int 985 ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen, 986 u_int32_t *rtalertp, u_int32_t *plenp) 987 { 988 struct ip6_hdr *ip6; 989 int optlen = 0; 990 u_int8_t *opt = opthead; 991 u_int16_t rtalert_val; 992 u_int32_t jumboplen; 993 const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh); 994 995 for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 996 switch (*opt) { 997 case IP6OPT_PAD1: 998 optlen = 1; 999 break; 1000 case IP6OPT_PADN: 1001 if (hbhlen < IP6OPT_MINLEN) { 1002 IP6STAT_INC(ip6s_toosmall); 1003 goto bad; 1004 } 1005 optlen = *(opt + 1) + 2; 1006 break; 1007 case IP6OPT_ROUTER_ALERT: 1008 /* XXX may need check for alignment */ 1009 if (hbhlen < IP6OPT_RTALERT_LEN) { 1010 IP6STAT_INC(ip6s_toosmall); 1011 goto bad; 1012 } 1013 if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) { 1014 /* XXX stat */ 1015 icmp6_error(m, ICMP6_PARAM_PROB, 1016 ICMP6_PARAMPROB_HEADER, 1017 erroff + opt + 1 - opthead); 1018 return (-1); 1019 } 1020 optlen = IP6OPT_RTALERT_LEN; 1021 bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2); 1022 *rtalertp = ntohs(rtalert_val); 1023 break; 1024 case IP6OPT_JUMBO: 1025 /* XXX may need check for alignment */ 1026 if (hbhlen < IP6OPT_JUMBO_LEN) { 1027 IP6STAT_INC(ip6s_toosmall); 1028 goto bad; 1029 } 1030 if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) { 1031 /* XXX stat */ 1032 icmp6_error(m, ICMP6_PARAM_PROB, 1033 ICMP6_PARAMPROB_HEADER, 1034 erroff + opt + 1 - opthead); 1035 return (-1); 1036 } 1037 optlen = IP6OPT_JUMBO_LEN; 1038 1039 /* 1040 * IPv6 packets that have non 0 payload length 1041 * must not contain a jumbo payload option. 1042 */ 1043 ip6 = mtod(m, struct ip6_hdr *); 1044 if (ip6->ip6_plen) { 1045 IP6STAT_INC(ip6s_badoptions); 1046 icmp6_error(m, ICMP6_PARAM_PROB, 1047 ICMP6_PARAMPROB_HEADER, 1048 erroff + opt - opthead); 1049 return (-1); 1050 } 1051 1052 /* 1053 * We may see jumbolen in unaligned location, so 1054 * we'd need to perform bcopy(). 1055 */ 1056 bcopy(opt + 2, &jumboplen, sizeof(jumboplen)); 1057 jumboplen = (u_int32_t)htonl(jumboplen); 1058 1059 #if 1 1060 /* 1061 * if there are multiple jumbo payload options, 1062 * *plenp will be non-zero and the packet will be 1063 * rejected. 1064 * the behavior may need some debate in ipngwg - 1065 * multiple options does not make sense, however, 1066 * there's no explicit mention in specification. 1067 */ 1068 if (*plenp != 0) { 1069 IP6STAT_INC(ip6s_badoptions); 1070 icmp6_error(m, ICMP6_PARAM_PROB, 1071 ICMP6_PARAMPROB_HEADER, 1072 erroff + opt + 2 - opthead); 1073 return (-1); 1074 } 1075 #endif 1076 1077 /* 1078 * jumbo payload length must be larger than 65535. 1079 */ 1080 if (jumboplen <= IPV6_MAXPACKET) { 1081 IP6STAT_INC(ip6s_badoptions); 1082 icmp6_error(m, ICMP6_PARAM_PROB, 1083 ICMP6_PARAMPROB_HEADER, 1084 erroff + opt + 2 - opthead); 1085 return (-1); 1086 } 1087 *plenp = jumboplen; 1088 1089 break; 1090 default: /* unknown option */ 1091 if (hbhlen < IP6OPT_MINLEN) { 1092 IP6STAT_INC(ip6s_toosmall); 1093 goto bad; 1094 } 1095 optlen = ip6_unknown_opt(opt, m, 1096 erroff + opt - opthead); 1097 if (optlen == -1) 1098 return (-1); 1099 optlen += 2; 1100 break; 1101 } 1102 } 1103 1104 return (0); 1105 1106 bad: 1107 m_freem(m); 1108 return (-1); 1109 } 1110 1111 /* 1112 * Unknown option processing. 1113 * The third argument `off' is the offset from the IPv6 header to the option, 1114 * which is necessary if the IPv6 header the and option header and IPv6 header 1115 * is not contiguous in order to return an ICMPv6 error. 1116 */ 1117 int 1118 ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off) 1119 { 1120 struct ip6_hdr *ip6; 1121 1122 switch (IP6OPT_TYPE(*optp)) { 1123 case IP6OPT_TYPE_SKIP: /* ignore the option */ 1124 return ((int)*(optp + 1)); 1125 case IP6OPT_TYPE_DISCARD: /* silently discard */ 1126 m_freem(m); 1127 return (-1); 1128 case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 1129 IP6STAT_INC(ip6s_badoptions); 1130 icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 1131 return (-1); 1132 case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 1133 IP6STAT_INC(ip6s_badoptions); 1134 ip6 = mtod(m, struct ip6_hdr *); 1135 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 1136 (m->m_flags & (M_BCAST|M_MCAST))) 1137 m_freem(m); 1138 else 1139 icmp6_error(m, ICMP6_PARAM_PROB, 1140 ICMP6_PARAMPROB_OPTION, off); 1141 return (-1); 1142 } 1143 1144 m_freem(m); /* XXX: NOTREACHED */ 1145 return (-1); 1146 } 1147 1148 /* 1149 * Create the "control" list for this pcb. 1150 * These functions will not modify mbuf chain at all. 1151 * 1152 * The routine will be called from upper layer handlers like tcp6_input(). 1153 * Thus the routine assumes that the caller (tcp6_input) have already 1154 * called m_pullup() and all the extension headers are located in the 1155 * very first mbuf on the mbuf chain. 1156 * 1157 * ip6_savecontrol_v4 will handle those options that are possible to be 1158 * set on a v4-mapped socket. 1159 * ip6_savecontrol will directly call ip6_savecontrol_v4 to handle those 1160 * options and handle the v6-only ones itself. 1161 */ 1162 struct mbuf ** 1163 ip6_savecontrol_v4(struct inpcb *inp, struct mbuf *m, struct mbuf **mp, 1164 int *v4only) 1165 { 1166 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1167 1168 #ifdef SO_TIMESTAMP 1169 if ((inp->inp_socket->so_options & SO_TIMESTAMP) != 0) { 1170 union { 1171 struct timeval tv; 1172 struct bintime bt; 1173 struct timespec ts; 1174 } t; 1175 struct bintime boottimebin, bt1; 1176 struct timespec ts1; 1177 bool stamped; 1178 1179 stamped = false; 1180 switch (inp->inp_socket->so_ts_clock) { 1181 case SO_TS_REALTIME_MICRO: 1182 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1183 M_TSTMP)) { 1184 mbuf_tstmp2timespec(m, &ts1); 1185 timespec2bintime(&ts1, &bt1); 1186 getboottimebin(&boottimebin); 1187 bintime_add(&bt1, &boottimebin); 1188 bintime2timeval(&bt1, &t.tv); 1189 } else { 1190 microtime(&t.tv); 1191 } 1192 *mp = sbcreatecontrol(&t.tv, sizeof(t.tv), 1193 SCM_TIMESTAMP, SOL_SOCKET, M_NOWAIT); 1194 if (*mp != NULL) { 1195 mp = &(*mp)->m_next; 1196 stamped = true; 1197 } 1198 break; 1199 1200 case SO_TS_BINTIME: 1201 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1202 M_TSTMP)) { 1203 mbuf_tstmp2timespec(m, &ts1); 1204 timespec2bintime(&ts1, &t.bt); 1205 getboottimebin(&boottimebin); 1206 bintime_add(&t.bt, &boottimebin); 1207 } else { 1208 bintime(&t.bt); 1209 } 1210 *mp = sbcreatecontrol(&t.bt, sizeof(t.bt), SCM_BINTIME, 1211 SOL_SOCKET, M_NOWAIT); 1212 if (*mp != NULL) { 1213 mp = &(*mp)->m_next; 1214 stamped = true; 1215 } 1216 break; 1217 1218 case SO_TS_REALTIME: 1219 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1220 M_TSTMP)) { 1221 mbuf_tstmp2timespec(m, &t.ts); 1222 getboottimebin(&boottimebin); 1223 bintime2timespec(&boottimebin, &ts1); 1224 timespecadd(&t.ts, &ts1, &t.ts); 1225 } else { 1226 nanotime(&t.ts); 1227 } 1228 *mp = sbcreatecontrol(&t.ts, sizeof(t.ts), 1229 SCM_REALTIME, SOL_SOCKET, M_NOWAIT); 1230 if (*mp != NULL) { 1231 mp = &(*mp)->m_next; 1232 stamped = true; 1233 } 1234 break; 1235 1236 case SO_TS_MONOTONIC: 1237 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1238 M_TSTMP)) 1239 mbuf_tstmp2timespec(m, &t.ts); 1240 else 1241 nanouptime(&t.ts); 1242 *mp = sbcreatecontrol(&t.ts, sizeof(t.ts), 1243 SCM_MONOTONIC, SOL_SOCKET, M_NOWAIT); 1244 if (*mp != NULL) { 1245 mp = &(*mp)->m_next; 1246 stamped = true; 1247 } 1248 break; 1249 1250 default: 1251 panic("unknown (corrupted) so_ts_clock"); 1252 } 1253 if (stamped && (m->m_flags & (M_PKTHDR | M_TSTMP)) == 1254 (M_PKTHDR | M_TSTMP)) { 1255 struct sock_timestamp_info sti; 1256 1257 bzero(&sti, sizeof(sti)); 1258 sti.st_info_flags = ST_INFO_HW; 1259 if ((m->m_flags & M_TSTMP_HPREC) != 0) 1260 sti.st_info_flags |= ST_INFO_HW_HPREC; 1261 *mp = sbcreatecontrol(&sti, sizeof(sti), SCM_TIME_INFO, 1262 SOL_SOCKET, M_NOWAIT); 1263 if (*mp != NULL) 1264 mp = &(*mp)->m_next; 1265 } 1266 } 1267 #endif 1268 1269 #define IS2292(inp, x, y) (((inp)->inp_flags & IN6P_RFC2292) ? (x) : (y)) 1270 /* RFC 2292 sec. 5 */ 1271 if ((inp->inp_flags & IN6P_PKTINFO) != 0) { 1272 struct in6_pktinfo pi6; 1273 1274 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1275 #ifdef INET 1276 struct ip *ip; 1277 1278 ip = mtod(m, struct ip *); 1279 pi6.ipi6_addr.s6_addr32[0] = 0; 1280 pi6.ipi6_addr.s6_addr32[1] = 0; 1281 pi6.ipi6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP; 1282 pi6.ipi6_addr.s6_addr32[3] = ip->ip_dst.s_addr; 1283 #else 1284 /* We won't hit this code */ 1285 bzero(&pi6.ipi6_addr, sizeof(struct in6_addr)); 1286 #endif 1287 } else { 1288 bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr)); 1289 in6_clearscope(&pi6.ipi6_addr); /* XXX */ 1290 } 1291 pi6.ipi6_ifindex = 1292 (m && m->m_pkthdr.rcvif) ? m->m_pkthdr.rcvif->if_index : 0; 1293 1294 *mp = sbcreatecontrol(&pi6, sizeof(struct in6_pktinfo), 1295 IS2292(inp, IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6, 1296 M_NOWAIT); 1297 if (*mp) 1298 mp = &(*mp)->m_next; 1299 } 1300 1301 if ((inp->inp_flags & IN6P_HOPLIMIT) != 0) { 1302 int hlim; 1303 1304 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1305 #ifdef INET 1306 struct ip *ip; 1307 1308 ip = mtod(m, struct ip *); 1309 hlim = ip->ip_ttl; 1310 #else 1311 /* We won't hit this code */ 1312 hlim = 0; 1313 #endif 1314 } else { 1315 hlim = ip6->ip6_hlim & 0xff; 1316 } 1317 *mp = sbcreatecontrol(&hlim, sizeof(int), 1318 IS2292(inp, IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), 1319 IPPROTO_IPV6, M_NOWAIT); 1320 if (*mp) 1321 mp = &(*mp)->m_next; 1322 } 1323 1324 if ((inp->inp_flags & IN6P_TCLASS) != 0) { 1325 int tclass; 1326 1327 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1328 #ifdef INET 1329 struct ip *ip; 1330 1331 ip = mtod(m, struct ip *); 1332 tclass = ip->ip_tos; 1333 #else 1334 /* We won't hit this code */ 1335 tclass = 0; 1336 #endif 1337 } else { 1338 u_int32_t flowinfo; 1339 1340 flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK); 1341 flowinfo >>= 20; 1342 tclass = flowinfo & 0xff; 1343 } 1344 *mp = sbcreatecontrol(&tclass, sizeof(int), IPV6_TCLASS, 1345 IPPROTO_IPV6, M_NOWAIT); 1346 if (*mp) 1347 mp = &(*mp)->m_next; 1348 } 1349 1350 if (v4only != NULL) { 1351 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1352 *v4only = 1; 1353 } else { 1354 *v4only = 0; 1355 } 1356 } 1357 1358 return (mp); 1359 } 1360 1361 void 1362 ip6_savecontrol(struct inpcb *inp, struct mbuf *m, struct mbuf **mp) 1363 { 1364 struct ip6_hdr *ip6; 1365 int v4only = 0; 1366 1367 mp = ip6_savecontrol_v4(inp, m, mp, &v4only); 1368 if (v4only) 1369 return; 1370 1371 ip6 = mtod(m, struct ip6_hdr *); 1372 /* 1373 * IPV6_HOPOPTS socket option. Recall that we required super-user 1374 * privilege for the option (see ip6_ctloutput), but it might be too 1375 * strict, since there might be some hop-by-hop options which can be 1376 * returned to normal user. 1377 * See also RFC 2292 section 6 (or RFC 3542 section 8). 1378 */ 1379 if ((inp->inp_flags & IN6P_HOPOPTS) != 0) { 1380 /* 1381 * Check if a hop-by-hop options header is contatined in the 1382 * received packet, and if so, store the options as ancillary 1383 * data. Note that a hop-by-hop options header must be 1384 * just after the IPv6 header, which is assured through the 1385 * IPv6 input processing. 1386 */ 1387 if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 1388 struct ip6_hbh *hbh; 1389 u_int hbhlen; 1390 1391 hbh = (struct ip6_hbh *)(ip6 + 1); 1392 hbhlen = (hbh->ip6h_len + 1) << 3; 1393 1394 /* 1395 * XXX: We copy the whole header even if a 1396 * jumbo payload option is included, the option which 1397 * is to be removed before returning according to 1398 * RFC2292. 1399 * Note: this constraint is removed in RFC3542 1400 */ 1401 *mp = sbcreatecontrol(hbh, hbhlen, 1402 IS2292(inp, IPV6_2292HOPOPTS, IPV6_HOPOPTS), 1403 IPPROTO_IPV6, M_NOWAIT); 1404 if (*mp) 1405 mp = &(*mp)->m_next; 1406 } 1407 } 1408 1409 if ((inp->inp_flags & (IN6P_RTHDR | IN6P_DSTOPTS)) != 0) { 1410 int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr); 1411 1412 /* 1413 * Search for destination options headers or routing 1414 * header(s) through the header chain, and stores each 1415 * header as ancillary data. 1416 * Note that the order of the headers remains in 1417 * the chain of ancillary data. 1418 */ 1419 while (1) { /* is explicit loop prevention necessary? */ 1420 struct ip6_ext *ip6e = NULL; 1421 u_int elen; 1422 1423 /* 1424 * if it is not an extension header, don't try to 1425 * pull it from the chain. 1426 */ 1427 switch (nxt) { 1428 case IPPROTO_DSTOPTS: 1429 case IPPROTO_ROUTING: 1430 case IPPROTO_HOPOPTS: 1431 case IPPROTO_AH: /* is it possible? */ 1432 break; 1433 default: 1434 goto loopend; 1435 } 1436 1437 if (off + sizeof(*ip6e) > m->m_len) 1438 goto loopend; 1439 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off); 1440 if (nxt == IPPROTO_AH) 1441 elen = (ip6e->ip6e_len + 2) << 2; 1442 else 1443 elen = (ip6e->ip6e_len + 1) << 3; 1444 if (off + elen > m->m_len) 1445 goto loopend; 1446 1447 switch (nxt) { 1448 case IPPROTO_DSTOPTS: 1449 if (!(inp->inp_flags & IN6P_DSTOPTS)) 1450 break; 1451 1452 *mp = sbcreatecontrol(ip6e, elen, 1453 IS2292(inp, IPV6_2292DSTOPTS, IPV6_DSTOPTS), 1454 IPPROTO_IPV6, M_NOWAIT); 1455 if (*mp) 1456 mp = &(*mp)->m_next; 1457 break; 1458 case IPPROTO_ROUTING: 1459 if (!(inp->inp_flags & IN6P_RTHDR)) 1460 break; 1461 1462 *mp = sbcreatecontrol(ip6e, elen, 1463 IS2292(inp, IPV6_2292RTHDR, IPV6_RTHDR), 1464 IPPROTO_IPV6, M_NOWAIT); 1465 if (*mp) 1466 mp = &(*mp)->m_next; 1467 break; 1468 case IPPROTO_HOPOPTS: 1469 case IPPROTO_AH: /* is it possible? */ 1470 break; 1471 1472 default: 1473 /* 1474 * other cases have been filtered in the above. 1475 * none will visit this case. here we supply 1476 * the code just in case (nxt overwritten or 1477 * other cases). 1478 */ 1479 goto loopend; 1480 } 1481 1482 /* proceed with the next header. */ 1483 off += elen; 1484 nxt = ip6e->ip6e_nxt; 1485 ip6e = NULL; 1486 } 1487 loopend: 1488 ; 1489 } 1490 1491 if (inp->inp_flags2 & INP_RECVFLOWID) { 1492 uint32_t flowid, flow_type; 1493 1494 flowid = m->m_pkthdr.flowid; 1495 flow_type = M_HASHTYPE_GET(m); 1496 1497 /* 1498 * XXX should handle the failure of one or the 1499 * other - don't populate both? 1500 */ 1501 *mp = sbcreatecontrol(&flowid, sizeof(uint32_t), IPV6_FLOWID, 1502 IPPROTO_IPV6, M_NOWAIT); 1503 if (*mp) 1504 mp = &(*mp)->m_next; 1505 *mp = sbcreatecontrol(&flow_type, sizeof(uint32_t), 1506 IPV6_FLOWTYPE, IPPROTO_IPV6, M_NOWAIT); 1507 if (*mp) 1508 mp = &(*mp)->m_next; 1509 } 1510 1511 #ifdef RSS 1512 if (inp->inp_flags2 & INP_RECVRSSBUCKETID) { 1513 uint32_t flowid, flow_type; 1514 uint32_t rss_bucketid; 1515 1516 flowid = m->m_pkthdr.flowid; 1517 flow_type = M_HASHTYPE_GET(m); 1518 1519 if (rss_hash2bucket(flowid, flow_type, &rss_bucketid) == 0) { 1520 *mp = sbcreatecontrol(&rss_bucketid, sizeof(uint32_t), 1521 IPV6_RSSBUCKETID, IPPROTO_IPV6, M_NOWAIT); 1522 if (*mp) 1523 mp = &(*mp)->m_next; 1524 } 1525 } 1526 #endif 1527 1528 } 1529 #undef IS2292 1530 1531 void 1532 ip6_notify_pmtu(struct inpcb *inp, struct sockaddr_in6 *dst, u_int32_t mtu) 1533 { 1534 struct socket *so; 1535 struct mbuf *m_mtu; 1536 struct ip6_mtuinfo mtuctl; 1537 1538 KASSERT(inp != NULL, ("%s: inp == NULL", __func__)); 1539 /* 1540 * Notify the error by sending IPV6_PATHMTU ancillary data if 1541 * application wanted to know the MTU value. 1542 * NOTE: we notify disconnected sockets, because some udp 1543 * applications keep sending sockets disconnected. 1544 * NOTE: our implementation doesn't notify connected sockets that has 1545 * foreign address that is different than given destination addresses 1546 * (this is permitted by RFC 3542). 1547 */ 1548 if ((inp->inp_flags & IN6P_MTU) == 0 || ( 1549 !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 1550 !IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &dst->sin6_addr))) 1551 return; 1552 1553 mtuctl.ip6m_mtu = mtu; 1554 mtuctl.ip6m_addr = *dst; 1555 if (sa6_recoverscope(&mtuctl.ip6m_addr)) 1556 return; 1557 1558 if ((m_mtu = sbcreatecontrol(&mtuctl, sizeof(mtuctl), IPV6_PATHMTU, 1559 IPPROTO_IPV6, M_NOWAIT)) == NULL) 1560 return; 1561 1562 so = inp->inp_socket; 1563 if (sbappendaddr(&so->so_rcv, (struct sockaddr *)dst, NULL, m_mtu) 1564 == 0) { 1565 soroverflow(so); 1566 m_freem(m_mtu); 1567 /* XXX: should count statistics */ 1568 } else 1569 sorwakeup(so); 1570 } 1571 1572 /* 1573 * Get pointer to the previous header followed by the header 1574 * currently processed. 1575 */ 1576 int 1577 ip6_get_prevhdr(const struct mbuf *m, int off) 1578 { 1579 struct ip6_ext ip6e; 1580 struct ip6_hdr *ip6; 1581 int len, nlen, nxt; 1582 1583 if (off == sizeof(struct ip6_hdr)) 1584 return (offsetof(struct ip6_hdr, ip6_nxt)); 1585 if (off < sizeof(struct ip6_hdr)) 1586 panic("%s: off < sizeof(struct ip6_hdr)", __func__); 1587 1588 ip6 = mtod(m, struct ip6_hdr *); 1589 nxt = ip6->ip6_nxt; 1590 len = sizeof(struct ip6_hdr); 1591 nlen = 0; 1592 while (len < off) { 1593 m_copydata(m, len, sizeof(ip6e), (caddr_t)&ip6e); 1594 switch (nxt) { 1595 case IPPROTO_FRAGMENT: 1596 nlen = sizeof(struct ip6_frag); 1597 break; 1598 case IPPROTO_AH: 1599 nlen = (ip6e.ip6e_len + 2) << 2; 1600 break; 1601 default: 1602 nlen = (ip6e.ip6e_len + 1) << 3; 1603 } 1604 len += nlen; 1605 nxt = ip6e.ip6e_nxt; 1606 } 1607 return (len - nlen); 1608 } 1609 1610 /* 1611 * get next header offset. m will be retained. 1612 */ 1613 int 1614 ip6_nexthdr(const struct mbuf *m, int off, int proto, int *nxtp) 1615 { 1616 struct ip6_hdr ip6; 1617 struct ip6_ext ip6e; 1618 struct ip6_frag fh; 1619 1620 /* just in case */ 1621 if (m == NULL) 1622 panic("ip6_nexthdr: m == NULL"); 1623 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off) 1624 return -1; 1625 1626 switch (proto) { 1627 case IPPROTO_IPV6: 1628 if (m->m_pkthdr.len < off + sizeof(ip6)) 1629 return -1; 1630 m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6); 1631 if (nxtp) 1632 *nxtp = ip6.ip6_nxt; 1633 off += sizeof(ip6); 1634 return off; 1635 1636 case IPPROTO_FRAGMENT: 1637 /* 1638 * terminate parsing if it is not the first fragment, 1639 * it does not make sense to parse through it. 1640 */ 1641 if (m->m_pkthdr.len < off + sizeof(fh)) 1642 return -1; 1643 m_copydata(m, off, sizeof(fh), (caddr_t)&fh); 1644 /* IP6F_OFF_MASK = 0xfff8(BigEndian), 0xf8ff(LittleEndian) */ 1645 if (fh.ip6f_offlg & IP6F_OFF_MASK) 1646 return -1; 1647 if (nxtp) 1648 *nxtp = fh.ip6f_nxt; 1649 off += sizeof(struct ip6_frag); 1650 return off; 1651 1652 case IPPROTO_AH: 1653 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1654 return -1; 1655 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1656 if (nxtp) 1657 *nxtp = ip6e.ip6e_nxt; 1658 off += (ip6e.ip6e_len + 2) << 2; 1659 return off; 1660 1661 case IPPROTO_HOPOPTS: 1662 case IPPROTO_ROUTING: 1663 case IPPROTO_DSTOPTS: 1664 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1665 return -1; 1666 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1667 if (nxtp) 1668 *nxtp = ip6e.ip6e_nxt; 1669 off += (ip6e.ip6e_len + 1) << 3; 1670 return off; 1671 1672 case IPPROTO_NONE: 1673 case IPPROTO_ESP: 1674 case IPPROTO_IPCOMP: 1675 /* give up */ 1676 return -1; 1677 1678 default: 1679 return -1; 1680 } 1681 1682 /* NOTREACHED */ 1683 } 1684 1685 /* 1686 * get offset for the last header in the chain. m will be kept untainted. 1687 */ 1688 int 1689 ip6_lasthdr(const struct mbuf *m, int off, int proto, int *nxtp) 1690 { 1691 int newoff; 1692 int nxt; 1693 1694 if (!nxtp) { 1695 nxt = -1; 1696 nxtp = &nxt; 1697 } 1698 while (1) { 1699 newoff = ip6_nexthdr(m, off, proto, nxtp); 1700 if (newoff < 0) 1701 return off; 1702 else if (newoff < off) 1703 return -1; /* invalid */ 1704 else if (newoff == off) 1705 return newoff; 1706 1707 off = newoff; 1708 proto = *nxtp; 1709 } 1710 } 1711