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sys/netinet/ip_input.c
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1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1982, 1986, 1988, 1993 5 * The Regents of the University of California. 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 University 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 REGENTS 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 REGENTS 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 * @(#)ip_input.c 8.2 (Berkeley) 1/4/94 32 */ 33 34 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD$"); 36 37 #include "opt_bootp.h" 38 #include "opt_inet.h" 39 #include "opt_ipstealth.h" 40 #include "opt_ipsec.h" 41 #include "opt_route.h" 42 #include "opt_rss.h" 43 #include "opt_sctp.h" 44 45 #include <sys/param.h> 46 #include <sys/systm.h> 47 #include <sys/hhook.h> 48 #include <sys/mbuf.h> 49 #include <sys/malloc.h> 50 #include <sys/domain.h> 51 #include <sys/protosw.h> 52 #include <sys/socket.h> 53 #include <sys/time.h> 54 #include <sys/kernel.h> 55 #include <sys/lock.h> 56 #include <sys/rmlock.h> 57 #include <sys/rwlock.h> 58 #include <sys/sdt.h> 59 #include <sys/syslog.h> 60 #include <sys/sysctl.h> 61 62 #include <net/if.h> 63 #include <net/if_types.h> 64 #include <net/if_var.h> 65 #include <net/if_dl.h> 66 #include <net/pfil.h> 67 #include <net/route.h> 68 #include <net/route/nhop.h> 69 #include <net/netisr.h> 70 #include <net/rss_config.h> 71 #include <net/vnet.h> 72 73 #include <netinet/in.h> 74 #include <netinet/in_kdtrace.h> 75 #include <netinet/in_systm.h> 76 #include <netinet/in_var.h> 77 #include <netinet/ip.h> 78 #include <netinet/in_fib.h> 79 #include <netinet/in_pcb.h> 80 #include <netinet/ip_var.h> 81 #include <netinet/ip_encap.h> 82 #include <netinet/ip_fw.h> 83 #include <netinet/ip_icmp.h> 84 #include <netinet/igmp_var.h> 85 #include <netinet/ip_options.h> 86 #include <machine/in_cksum.h> 87 #include <netinet/ip_carp.h> 88 #include <netinet/in_rss.h> 89 #ifdef SCTP 90 #include <netinet/sctp_var.h> 91 #endif 92 93 #include <netipsec/ipsec_support.h> 94 95 #include <sys/socketvar.h> 96 97 #include <security/mac/mac_framework.h> 98 99 #ifdef CTASSERT 100 CTASSERT(sizeof(struct ip) == 20); 101 #endif 102 103 /* IP reassembly functions are defined in ip_reass.c. */ 104 extern void ipreass_init(void); 105 extern void ipreass_vnet_init(void); 106 #ifdef VIMAGE 107 extern void ipreass_destroy(void); 108 #endif 109 110 VNET_DEFINE(int, rsvp_on); 111 112 VNET_DEFINE(int, ipforwarding); 113 SYSCTL_INT(_net_inet_ip, IPCTL_FORWARDING, forwarding, CTLFLAG_VNET | CTLFLAG_RW, 114 &VNET_NAME(ipforwarding), 0, 115 "Enable IP forwarding between interfaces"); 116 117 /* 118 * Respond with an ICMP host redirect when we forward a packet out of 119 * the same interface on which it was received. See RFC 792. 120 */ 121 VNET_DEFINE(int, ipsendredirects) = 1; 122 SYSCTL_INT(_net_inet_ip, IPCTL_SENDREDIRECTS, redirect, CTLFLAG_VNET | CTLFLAG_RW, 123 &VNET_NAME(ipsendredirects), 0, 124 "Enable sending IP redirects"); 125 126 VNET_DEFINE_STATIC(bool, ip_strong_es) = false; 127 #define V_ip_strong_es VNET(ip_strong_es) 128 SYSCTL_BOOL(_net_inet_ip, OID_AUTO, rfc1122_strong_es, 129 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip_strong_es), false, 130 "Packet's IP destination address must match address on arrival interface"); 131 132 VNET_DEFINE_STATIC(bool, ip_sav) = true; 133 #define V_ip_sav VNET(ip_sav) 134 SYSCTL_BOOL(_net_inet_ip, OID_AUTO, source_address_validation, 135 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip_sav), true, 136 "Drop incoming packets with source address that is a local address"); 137 138 VNET_DEFINE(pfil_head_t, inet_pfil_head); /* Packet filter hooks */ 139 140 static struct netisr_handler ip_nh = { 141 .nh_name = "ip", 142 .nh_handler = ip_input, 143 .nh_proto = NETISR_IP, 144 #ifdef RSS 145 .nh_m2cpuid = rss_soft_m2cpuid_v4, 146 .nh_policy = NETISR_POLICY_CPU, 147 .nh_dispatch = NETISR_DISPATCH_HYBRID, 148 #else 149 .nh_policy = NETISR_POLICY_FLOW, 150 #endif 151 }; 152 153 #ifdef RSS 154 /* 155 * Directly dispatched frames are currently assumed 156 * to have a flowid already calculated. 157 * 158 * It should likely have something that assert it 159 * actually has valid flow details. 160 */ 161 static struct netisr_handler ip_direct_nh = { 162 .nh_name = "ip_direct", 163 .nh_handler = ip_direct_input, 164 .nh_proto = NETISR_IP_DIRECT, 165 .nh_m2cpuid = rss_soft_m2cpuid_v4, 166 .nh_policy = NETISR_POLICY_CPU, 167 .nh_dispatch = NETISR_DISPATCH_HYBRID, 168 }; 169 #endif 170 171 ipproto_input_t *ip_protox[IPPROTO_MAX] = { 172 [0 ... IPPROTO_MAX - 1] = rip_input }; 173 ipproto_ctlinput_t *ip_ctlprotox[IPPROTO_MAX] = { 174 [0 ... IPPROTO_MAX - 1] = rip_ctlinput }; 175 176 VNET_DEFINE(struct in_ifaddrhead, in_ifaddrhead); /* first inet address */ 177 VNET_DEFINE(struct in_ifaddrhashhead *, in_ifaddrhashtbl); /* inet addr hash table */ 178 VNET_DEFINE(u_long, in_ifaddrhmask); /* mask for hash table */ 179 180 /* Make sure it is safe to use hashinit(9) on CK_LIST. */ 181 CTASSERT(sizeof(struct in_ifaddrhashhead) == sizeof(LIST_HEAD(, in_addr))); 182 183 #ifdef IPCTL_DEFMTU 184 SYSCTL_INT(_net_inet_ip, IPCTL_DEFMTU, mtu, CTLFLAG_RW, 185 &ip_mtu, 0, "Default MTU"); 186 #endif 187 188 #ifdef IPSTEALTH 189 VNET_DEFINE(int, ipstealth); 190 SYSCTL_INT(_net_inet_ip, OID_AUTO, stealth, CTLFLAG_VNET | CTLFLAG_RW, 191 &VNET_NAME(ipstealth), 0, 192 "IP stealth mode, no TTL decrementation on forwarding"); 193 #endif 194 195 /* 196 * IP statistics are stored in the "array" of counter(9)s. 197 */ 198 VNET_PCPUSTAT_DEFINE(struct ipstat, ipstat); 199 VNET_PCPUSTAT_SYSINIT(ipstat); 200 SYSCTL_VNET_PCPUSTAT(_net_inet_ip, IPCTL_STATS, stats, struct ipstat, ipstat, 201 "IP statistics (struct ipstat, netinet/ip_var.h)"); 202 203 #ifdef VIMAGE 204 VNET_PCPUSTAT_SYSUNINIT(ipstat); 205 #endif /* VIMAGE */ 206 207 /* 208 * Kernel module interface for updating ipstat. The argument is an index 209 * into ipstat treated as an array. 210 */ 211 void 212 kmod_ipstat_inc(int statnum) 213 { 214 215 counter_u64_add(VNET(ipstat)[statnum], 1); 216 } 217 218 void 219 kmod_ipstat_dec(int statnum) 220 { 221 222 counter_u64_add(VNET(ipstat)[statnum], -1); 223 } 224 225 static int 226 sysctl_netinet_intr_queue_maxlen(SYSCTL_HANDLER_ARGS) 227 { 228 int error, qlimit; 229 230 netisr_getqlimit(&ip_nh, &qlimit); 231 error = sysctl_handle_int(oidp, &qlimit, 0, req); 232 if (error || !req->newptr) 233 return (error); 234 if (qlimit < 1) 235 return (EINVAL); 236 return (netisr_setqlimit(&ip_nh, qlimit)); 237 } 238 SYSCTL_PROC(_net_inet_ip, IPCTL_INTRQMAXLEN, intr_queue_maxlen, 239 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 0, 240 sysctl_netinet_intr_queue_maxlen, "I", 241 "Maximum size of the IP input queue"); 242 243 static int 244 sysctl_netinet_intr_queue_drops(SYSCTL_HANDLER_ARGS) 245 { 246 u_int64_t qdrops_long; 247 int error, qdrops; 248 249 netisr_getqdrops(&ip_nh, &qdrops_long); 250 qdrops = qdrops_long; 251 error = sysctl_handle_int(oidp, &qdrops, 0, req); 252 if (error || !req->newptr) 253 return (error); 254 if (qdrops != 0) 255 return (EINVAL); 256 netisr_clearqdrops(&ip_nh); 257 return (0); 258 } 259 260 SYSCTL_PROC(_net_inet_ip, IPCTL_INTRQDROPS, intr_queue_drops, 261 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 262 0, 0, sysctl_netinet_intr_queue_drops, "I", 263 "Number of packets dropped from the IP input queue"); 264 265 #ifdef RSS 266 static int 267 sysctl_netinet_intr_direct_queue_maxlen(SYSCTL_HANDLER_ARGS) 268 { 269 int error, qlimit; 270 271 netisr_getqlimit(&ip_direct_nh, &qlimit); 272 error = sysctl_handle_int(oidp, &qlimit, 0, req); 273 if (error || !req->newptr) 274 return (error); 275 if (qlimit < 1) 276 return (EINVAL); 277 return (netisr_setqlimit(&ip_direct_nh, qlimit)); 278 } 279 SYSCTL_PROC(_net_inet_ip, IPCTL_INTRDQMAXLEN, intr_direct_queue_maxlen, 280 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 281 0, 0, sysctl_netinet_intr_direct_queue_maxlen, 282 "I", "Maximum size of the IP direct input queue"); 283 284 static int 285 sysctl_netinet_intr_direct_queue_drops(SYSCTL_HANDLER_ARGS) 286 { 287 u_int64_t qdrops_long; 288 int error, qdrops; 289 290 netisr_getqdrops(&ip_direct_nh, &qdrops_long); 291 qdrops = qdrops_long; 292 error = sysctl_handle_int(oidp, &qdrops, 0, req); 293 if (error || !req->newptr) 294 return (error); 295 if (qdrops != 0) 296 return (EINVAL); 297 netisr_clearqdrops(&ip_direct_nh); 298 return (0); 299 } 300 301 SYSCTL_PROC(_net_inet_ip, IPCTL_INTRDQDROPS, intr_direct_queue_drops, 302 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 0, 303 sysctl_netinet_intr_direct_queue_drops, "I", 304 "Number of packets dropped from the IP direct input queue"); 305 #endif /* RSS */ 306 307 /* 308 * IP initialization: fill in IP protocol switch table. 309 * All protocols not implemented in kernel go to raw IP protocol handler. 310 */ 311 static void 312 ip_vnet_init(void *arg __unused) 313 { 314 struct pfil_head_args args; 315 316 CK_STAILQ_INIT(&V_in_ifaddrhead); 317 V_in_ifaddrhashtbl = hashinit(INADDR_NHASH, M_IFADDR, &V_in_ifaddrhmask); 318 319 /* Initialize IP reassembly queue. */ 320 ipreass_vnet_init(); 321 322 /* Initialize packet filter hooks. */ 323 args.pa_version = PFIL_VERSION; 324 args.pa_flags = PFIL_IN | PFIL_OUT; 325 args.pa_type = PFIL_TYPE_IP4; 326 args.pa_headname = PFIL_INET_NAME; 327 V_inet_pfil_head = pfil_head_register(&args); 328 329 if (hhook_head_register(HHOOK_TYPE_IPSEC_IN, AF_INET, 330 &V_ipsec_hhh_in[HHOOK_IPSEC_INET], 331 HHOOK_WAITOK | HHOOK_HEADISINVNET) != 0) 332 printf("%s: WARNING: unable to register input helper hook\n", 333 __func__); 334 if (hhook_head_register(HHOOK_TYPE_IPSEC_OUT, AF_INET, 335 &V_ipsec_hhh_out[HHOOK_IPSEC_INET], 336 HHOOK_WAITOK | HHOOK_HEADISINVNET) != 0) 337 printf("%s: WARNING: unable to register output helper hook\n", 338 __func__); 339 340 #ifdef VIMAGE 341 netisr_register_vnet(&ip_nh); 342 #ifdef RSS 343 netisr_register_vnet(&ip_direct_nh); 344 #endif 345 #endif 346 } 347 VNET_SYSINIT(ip_vnet_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH, 348 ip_vnet_init, NULL); 349 350 static void 351 ip_init(const void *unused __unused) 352 { 353 354 ipreass_init(); 355 356 /* 357 * Register statically compiled protocols, that are unlikely to 358 * ever become dynamic. 359 */ 360 IPPROTO_REGISTER(IPPROTO_ICMP, icmp_input, NULL); 361 IPPROTO_REGISTER(IPPROTO_IGMP, igmp_input, NULL); 362 IPPROTO_REGISTER(IPPROTO_RSVP, rsvp_input, NULL); 363 IPPROTO_REGISTER(IPPROTO_IPV4, encap4_input, NULL); 364 IPPROTO_REGISTER(IPPROTO_MOBILE, encap4_input, NULL); 365 IPPROTO_REGISTER(IPPROTO_ETHERIP, encap4_input, NULL); 366 IPPROTO_REGISTER(IPPROTO_GRE, encap4_input, NULL); 367 IPPROTO_REGISTER(IPPROTO_IPV6, encap4_input, NULL); 368 IPPROTO_REGISTER(IPPROTO_PIM, encap4_input, NULL); 369 #ifdef SCTP /* XXX: has a loadable & static version */ 370 IPPROTO_REGISTER(IPPROTO_SCTP, sctp_input, sctp_ctlinput); 371 #endif 372 373 netisr_register(&ip_nh); 374 #ifdef RSS 375 netisr_register(&ip_direct_nh); 376 #endif 377 } 378 SYSINIT(ip_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, ip_init, NULL); 379 380 #ifdef VIMAGE 381 static void 382 ip_destroy(void *unused __unused) 383 { 384 int error; 385 386 #ifdef RSS 387 netisr_unregister_vnet(&ip_direct_nh); 388 #endif 389 netisr_unregister_vnet(&ip_nh); 390 391 pfil_head_unregister(V_inet_pfil_head); 392 error = hhook_head_deregister(V_ipsec_hhh_in[HHOOK_IPSEC_INET]); 393 if (error != 0) { 394 printf("%s: WARNING: unable to deregister input helper hook " 395 "type HHOOK_TYPE_IPSEC_IN, id HHOOK_IPSEC_INET: " 396 "error %d returned\n", __func__, error); 397 } 398 error = hhook_head_deregister(V_ipsec_hhh_out[HHOOK_IPSEC_INET]); 399 if (error != 0) { 400 printf("%s: WARNING: unable to deregister output helper hook " 401 "type HHOOK_TYPE_IPSEC_OUT, id HHOOK_IPSEC_INET: " 402 "error %d returned\n", __func__, error); 403 } 404 405 /* Remove the IPv4 addresses from all interfaces. */ 406 in_ifscrub_all(); 407 408 /* Make sure the IPv4 routes are gone as well. */ 409 rib_flush_routes_family(AF_INET); 410 411 /* Destroy IP reassembly queue. */ 412 ipreass_destroy(); 413 414 /* Cleanup in_ifaddr hash table; should be empty. */ 415 hashdestroy(V_in_ifaddrhashtbl, M_IFADDR, V_in_ifaddrhmask); 416 } 417 418 VNET_SYSUNINIT(ip, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, ip_destroy, NULL); 419 #endif 420 421 #ifdef RSS 422 /* 423 * IP direct input routine. 424 * 425 * This is called when reinjecting completed fragments where 426 * all of the previous checking and book-keeping has been done. 427 */ 428 void 429 ip_direct_input(struct mbuf *m) 430 { 431 struct ip *ip; 432 int hlen; 433 434 ip = mtod(m, struct ip *); 435 hlen = ip->ip_hl << 2; 436 437 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 438 if (IPSEC_ENABLED(ipv4)) { 439 if (IPSEC_INPUT(ipv4, m, hlen, ip->ip_p) != 0) 440 return; 441 } 442 #endif /* IPSEC */ 443 IPSTAT_INC(ips_delivered); 444 ip_protox[ip->ip_p](&m, &hlen, ip->ip_p); 445 } 446 #endif 447 448 /* 449 * Ip input routine. Checksum and byte swap header. If fragmented 450 * try to reassemble. Process options. Pass to next level. 451 */ 452 void 453 ip_input(struct mbuf *m) 454 { 455 struct ip *ip = NULL; 456 struct in_ifaddr *ia = NULL; 457 struct ifaddr *ifa; 458 struct ifnet *ifp; 459 int hlen = 0; 460 uint16_t sum, ip_len; 461 int dchg = 0; /* dest changed after fw */ 462 struct in_addr odst; /* original dst address */ 463 bool strong_es; 464 465 M_ASSERTPKTHDR(m); 466 NET_EPOCH_ASSERT(); 467 468 if (m->m_flags & M_FASTFWD_OURS) { 469 m->m_flags &= ~M_FASTFWD_OURS; 470 /* Set up some basics that will be used later. */ 471 ip = mtod(m, struct ip *); 472 hlen = ip->ip_hl << 2; 473 ip_len = ntohs(ip->ip_len); 474 goto ours; 475 } 476 477 IPSTAT_INC(ips_total); 478 479 if (__predict_false(m->m_pkthdr.len < sizeof(struct ip))) 480 goto tooshort; 481 482 if (m->m_len < sizeof(struct ip)) { 483 m = m_pullup(m, sizeof(struct ip)); 484 if (__predict_false(m == NULL)) { 485 IPSTAT_INC(ips_toosmall); 486 return; 487 } 488 } 489 ip = mtod(m, struct ip *); 490 491 if (__predict_false(ip->ip_v != IPVERSION)) { 492 IPSTAT_INC(ips_badvers); 493 goto bad; 494 } 495 496 hlen = ip->ip_hl << 2; 497 if (__predict_false(hlen < sizeof(struct ip))) { /* minimum header length */ 498 IPSTAT_INC(ips_badhlen); 499 goto bad; 500 } 501 if (hlen > m->m_len) { 502 m = m_pullup(m, hlen); 503 if (__predict_false(m == NULL)) { 504 IPSTAT_INC(ips_badhlen); 505 return; 506 } 507 ip = mtod(m, struct ip *); 508 } 509 510 IP_PROBE(receive, NULL, NULL, ip, m->m_pkthdr.rcvif, ip, NULL); 511 512 /* IN_LOOPBACK must not appear on the wire - RFC1122 */ 513 ifp = m->m_pkthdr.rcvif; 514 if (IN_LOOPBACK(ntohl(ip->ip_dst.s_addr)) || 515 IN_LOOPBACK(ntohl(ip->ip_src.s_addr))) { 516 if ((ifp->if_flags & IFF_LOOPBACK) == 0) { 517 IPSTAT_INC(ips_badaddr); 518 goto bad; 519 } 520 } 521 522 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) { 523 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID); 524 } else { 525 if (hlen == sizeof(struct ip)) { 526 sum = in_cksum_hdr(ip); 527 } else { 528 sum = in_cksum(m, hlen); 529 } 530 } 531 if (__predict_false(sum)) { 532 IPSTAT_INC(ips_badsum); 533 goto bad; 534 } 535 536 ip_len = ntohs(ip->ip_len); 537 if (__predict_false(ip_len < hlen)) { 538 IPSTAT_INC(ips_badlen); 539 goto bad; 540 } 541 542 /* 543 * Check that the amount of data in the buffers 544 * is as at least much as the IP header would have us expect. 545 * Trim mbufs if longer than we expect. 546 * Drop packet if shorter than we expect. 547 */ 548 if (__predict_false(m->m_pkthdr.len < ip_len)) { 549 tooshort: 550 IPSTAT_INC(ips_tooshort); 551 goto bad; 552 } 553 if (m->m_pkthdr.len > ip_len) { 554 if (m->m_len == m->m_pkthdr.len) { 555 m->m_len = ip_len; 556 m->m_pkthdr.len = ip_len; 557 } else 558 m_adj(m, ip_len - m->m_pkthdr.len); 559 } 560 561 /* 562 * Try to forward the packet, but if we fail continue. 563 * ip_tryforward() may generate redirects these days. 564 * XXX the logic below falling through to normal processing 565 * if redirects are required should be revisited as well. 566 * ip_tryforward() does inbound and outbound packet firewall 567 * processing. If firewall has decided that destination becomes 568 * our local address, it sets M_FASTFWD_OURS flag. In this 569 * case skip another inbound firewall processing and update 570 * ip pointer. 571 */ 572 if (V_ipforwarding != 0 573 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 574 && (!IPSEC_ENABLED(ipv4) || 575 IPSEC_CAPS(ipv4, m, IPSEC_CAP_OPERABLE) == 0) 576 #endif 577 ) { 578 /* 579 * ip_dooptions() was run so we can ignore the source route (or 580 * any IP options case) case for redirects in ip_tryforward(). 581 */ 582 if ((m = ip_tryforward(m)) == NULL) 583 return; 584 if (m->m_flags & M_FASTFWD_OURS) { 585 m->m_flags &= ~M_FASTFWD_OURS; 586 ip = mtod(m, struct ip *); 587 goto ours; 588 } 589 } 590 591 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 592 /* 593 * Bypass packet filtering for packets previously handled by IPsec. 594 */ 595 if (IPSEC_ENABLED(ipv4) && 596 IPSEC_CAPS(ipv4, m, IPSEC_CAP_BYPASS_FILTER) != 0) 597 goto passin; 598 #endif 599 600 /* 601 * Run through list of hooks for input packets. 602 * 603 * NB: Beware of the destination address changing (e.g. 604 * by NAT rewriting). When this happens, tell 605 * ip_forward to do the right thing. 606 */ 607 608 /* Jump over all PFIL processing if hooks are not active. */ 609 if (!PFIL_HOOKED_IN(V_inet_pfil_head)) 610 goto passin; 611 612 odst = ip->ip_dst; 613 if (pfil_mbuf_in(V_inet_pfil_head, &m, ifp, NULL) != 614 PFIL_PASS) 615 return; 616 if (m == NULL) /* consumed by filter */ 617 return; 618 619 ip = mtod(m, struct ip *); 620 dchg = (odst.s_addr != ip->ip_dst.s_addr); 621 622 if (m->m_flags & M_FASTFWD_OURS) { 623 m->m_flags &= ~M_FASTFWD_OURS; 624 goto ours; 625 } 626 if (m->m_flags & M_IP_NEXTHOP) { 627 if (m_tag_find(m, PACKET_TAG_IPFORWARD, NULL) != NULL) { 628 /* 629 * Directly ship the packet on. This allows 630 * forwarding packets originally destined to us 631 * to some other directly connected host. 632 */ 633 ip_forward(m, 1); 634 return; 635 } 636 } 637 passin: 638 639 /* 640 * Process options and, if not destined for us, 641 * ship it on. ip_dooptions returns 1 when an 642 * error was detected (causing an icmp message 643 * to be sent and the original packet to be freed). 644 */ 645 if (hlen > sizeof (struct ip) && ip_dooptions(m, 0)) 646 return; 647 648 /* greedy RSVP, snatches any PATH packet of the RSVP protocol and no 649 * matter if it is destined to another node, or whether it is 650 * a multicast one, RSVP wants it! and prevents it from being forwarded 651 * anywhere else. Also checks if the rsvp daemon is running before 652 * grabbing the packet. 653 */ 654 if (ip->ip_p == IPPROTO_RSVP && V_rsvp_on) 655 goto ours; 656 657 /* 658 * Check our list of addresses, to see if the packet is for us. 659 * If we don't have any addresses, assume any unicast packet 660 * we receive might be for us (and let the upper layers deal 661 * with it). 662 */ 663 if (CK_STAILQ_EMPTY(&V_in_ifaddrhead) && 664 (m->m_flags & (M_MCAST|M_BCAST)) == 0) 665 goto ours; 666 667 /* 668 * Enable a consistency check between the destination address 669 * and the arrival interface for a unicast packet (the RFC 1122 670 * strong ES model) with a list of additional predicates: 671 * - if IP forwarding is disabled 672 * - the packet is not locally generated 673 * - the packet is not subject to 'ipfw fwd' 674 * - Interface is not running CARP. If the packet got here, we already 675 * checked it with carp_iamatch() and carp_forus(). 676 */ 677 strong_es = V_ip_strong_es && (V_ipforwarding == 0) && 678 ((ifp->if_flags & IFF_LOOPBACK) == 0) && 679 ifp->if_carp == NULL && (dchg == 0); 680 681 /* 682 * Check for exact addresses in the hash bucket. 683 */ 684 CK_LIST_FOREACH(ia, INADDR_HASH(ip->ip_dst.s_addr), ia_hash) { 685 if (IA_SIN(ia)->sin_addr.s_addr != ip->ip_dst.s_addr) 686 continue; 687 688 /* 689 * net.inet.ip.rfc1122_strong_es: the address matches, verify 690 * that the packet arrived via the correct interface. 691 */ 692 if (__predict_false(strong_es && ia->ia_ifp != ifp)) { 693 IPSTAT_INC(ips_badaddr); 694 goto bad; 695 } 696 697 /* 698 * net.inet.ip.source_address_validation: drop incoming 699 * packets that pretend to be ours. 700 */ 701 if (V_ip_sav && !(ifp->if_flags & IFF_LOOPBACK) && 702 __predict_false(in_localip_fib(ip->ip_src, ifp->if_fib))) { 703 IPSTAT_INC(ips_badaddr); 704 goto bad; 705 } 706 707 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1); 708 counter_u64_add(ia->ia_ifa.ifa_ibytes, m->m_pkthdr.len); 709 goto ours; 710 } 711 712 /* 713 * Check for broadcast addresses. 714 * 715 * Only accept broadcast packets that arrive via the matching 716 * interface. Reception of forwarded directed broadcasts would 717 * be handled via ip_forward() and ether_output() with the loopback 718 * into the stack for SIMPLEX interfaces handled by ether_output(). 719 */ 720 if (ifp->if_flags & IFF_BROADCAST) { 721 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 722 if (ifa->ifa_addr->sa_family != AF_INET) 723 continue; 724 ia = ifatoia(ifa); 725 if (satosin(&ia->ia_broadaddr)->sin_addr.s_addr == 726 ip->ip_dst.s_addr) { 727 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1); 728 counter_u64_add(ia->ia_ifa.ifa_ibytes, 729 m->m_pkthdr.len); 730 goto ours; 731 } 732 #ifdef BOOTP_COMPAT 733 if (IA_SIN(ia)->sin_addr.s_addr == INADDR_ANY) { 734 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1); 735 counter_u64_add(ia->ia_ifa.ifa_ibytes, 736 m->m_pkthdr.len); 737 goto ours; 738 } 739 #endif 740 } 741 ia = NULL; 742 } 743 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 744 /* 745 * RFC 3927 2.7: Do not forward multicast packets from 746 * IN_LINKLOCAL. 747 */ 748 if (V_ip_mrouter && !IN_LINKLOCAL(ntohl(ip->ip_src.s_addr))) { 749 /* 750 * If we are acting as a multicast router, all 751 * incoming multicast packets are passed to the 752 * kernel-level multicast forwarding function. 753 * The packet is returned (relatively) intact; if 754 * ip_mforward() returns a non-zero value, the packet 755 * must be discarded, else it may be accepted below. 756 */ 757 if (ip_mforward && ip_mforward(ip, ifp, m, 0) != 0) { 758 IPSTAT_INC(ips_cantforward); 759 m_freem(m); 760 return; 761 } 762 763 /* 764 * The process-level routing daemon needs to receive 765 * all multicast IGMP packets, whether or not this 766 * host belongs to their destination groups. 767 */ 768 if (ip->ip_p == IPPROTO_IGMP) { 769 goto ours; 770 } 771 IPSTAT_INC(ips_forward); 772 } 773 /* 774 * Assume the packet is for us, to avoid prematurely taking 775 * a lock on the in_multi hash. Protocols must perform 776 * their own filtering and update statistics accordingly. 777 */ 778 goto ours; 779 } 780 if (ip->ip_dst.s_addr == (u_long)INADDR_BROADCAST) 781 goto ours; 782 if (ip->ip_dst.s_addr == INADDR_ANY) 783 goto ours; 784 /* RFC 3927 2.7: Do not forward packets to or from IN_LINKLOCAL. */ 785 if (IN_LINKLOCAL(ntohl(ip->ip_dst.s_addr)) || 786 IN_LINKLOCAL(ntohl(ip->ip_src.s_addr))) { 787 IPSTAT_INC(ips_cantforward); 788 m_freem(m); 789 return; 790 } 791 792 /* 793 * Not for us; forward if possible and desirable. 794 */ 795 if (V_ipforwarding == 0) { 796 IPSTAT_INC(ips_cantforward); 797 m_freem(m); 798 } else { 799 ip_forward(m, dchg); 800 } 801 return; 802 803 ours: 804 #ifdef IPSTEALTH 805 /* 806 * IPSTEALTH: Process non-routing options only 807 * if the packet is destined for us. 808 */ 809 if (V_ipstealth && hlen > sizeof (struct ip) && ip_dooptions(m, 1)) 810 return; 811 #endif /* IPSTEALTH */ 812 813 /* 814 * Attempt reassembly; if it succeeds, proceed. 815 * ip_reass() will return a different mbuf. 816 */ 817 if (ip->ip_off & htons(IP_MF | IP_OFFMASK)) { 818 /* XXXGL: shouldn't we save & set m_flags? */ 819 m = ip_reass(m); 820 if (m == NULL) 821 return; 822 ip = mtod(m, struct ip *); 823 /* Get the header length of the reassembled packet */ 824 hlen = ip->ip_hl << 2; 825 } 826 827 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 828 if (IPSEC_ENABLED(ipv4)) { 829 if (IPSEC_INPUT(ipv4, m, hlen, ip->ip_p) != 0) 830 return; 831 } 832 #endif /* IPSEC */ 833 834 /* 835 * Switch out to protocol's input routine. 836 */ 837 IPSTAT_INC(ips_delivered); 838 839 ip_protox[ip->ip_p](&m, &hlen, ip->ip_p); 840 return; 841 bad: 842 m_freem(m); 843 } 844 845 int 846 ipproto_register(uint8_t proto, ipproto_input_t input, ipproto_ctlinput_t ctl) 847 { 848 849 MPASS(proto > 0); 850 851 /* 852 * The protocol slot must not be occupied by another protocol 853 * already. An index pointing to rip_input() is unused. 854 */ 855 if (ip_protox[proto] == rip_input) { 856 ip_protox[proto] = input; 857 ip_ctlprotox[proto] = ctl; 858 return (0); 859 } else 860 return (EEXIST); 861 } 862 863 int 864 ipproto_unregister(uint8_t proto) 865 { 866 867 MPASS(proto > 0); 868 869 if (ip_protox[proto] != rip_input) { 870 ip_protox[proto] = rip_input; 871 ip_ctlprotox[proto] = rip_ctlinput; 872 return (0); 873 } else 874 return (ENOENT); 875 } 876 877 /* 878 * Forward a packet. If some error occurs return the sender 879 * an icmp packet. Note we can't always generate a meaningful 880 * icmp message because icmp doesn't have a large enough repertoire 881 * of codes and types. 882 * 883 * If not forwarding, just drop the packet. This could be confusing 884 * if ipforwarding was zero but some routing protocol was advancing 885 * us as a gateway to somewhere. However, we must let the routing 886 * protocol deal with that. 887 * 888 * The srcrt parameter indicates whether the packet is being forwarded 889 * via a source route. 890 */ 891 void 892 ip_forward(struct mbuf *m, int srcrt) 893 { 894 struct ip *ip = mtod(m, struct ip *); 895 struct in_ifaddr *ia; 896 struct mbuf *mcopy; 897 struct sockaddr_in *sin; 898 struct in_addr dest; 899 struct route ro; 900 uint32_t flowid; 901 int error, type = 0, code = 0, mtu = 0; 902 903 NET_EPOCH_ASSERT(); 904 905 if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) { 906 IPSTAT_INC(ips_cantforward); 907 m_freem(m); 908 return; 909 } 910 if ( 911 #ifdef IPSTEALTH 912 V_ipstealth == 0 && 913 #endif 914 ip->ip_ttl <= IPTTLDEC) { 915 icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, 0, 0); 916 return; 917 } 918 919 bzero(&ro, sizeof(ro)); 920 sin = (struct sockaddr_in *)&ro.ro_dst; 921 sin->sin_family = AF_INET; 922 sin->sin_len = sizeof(*sin); 923 sin->sin_addr = ip->ip_dst; 924 flowid = m->m_pkthdr.flowid; 925 ro.ro_nh = fib4_lookup(M_GETFIB(m), ip->ip_dst, 0, NHR_REF, flowid); 926 if (ro.ro_nh != NULL) { 927 ia = ifatoia(ro.ro_nh->nh_ifa); 928 } else 929 ia = NULL; 930 /* 931 * Save the IP header and at most 8 bytes of the payload, 932 * in case we need to generate an ICMP message to the src. 933 * 934 * XXX this can be optimized a lot by saving the data in a local 935 * buffer on the stack (72 bytes at most), and only allocating the 936 * mbuf if really necessary. The vast majority of the packets 937 * are forwarded without having to send an ICMP back (either 938 * because unnecessary, or because rate limited), so we are 939 * really we are wasting a lot of work here. 940 * 941 * We don't use m_copym() because it might return a reference 942 * to a shared cluster. Both this function and ip_output() 943 * assume exclusive access to the IP header in `m', so any 944 * data in a cluster may change before we reach icmp_error(). 945 */ 946 mcopy = m_gethdr(M_NOWAIT, m->m_type); 947 if (mcopy != NULL && !m_dup_pkthdr(mcopy, m, M_NOWAIT)) { 948 /* 949 * It's probably ok if the pkthdr dup fails (because 950 * the deep copy of the tag chain failed), but for now 951 * be conservative and just discard the copy since 952 * code below may some day want the tags. 953 */ 954 m_free(mcopy); 955 mcopy = NULL; 956 } 957 if (mcopy != NULL) { 958 mcopy->m_len = min(ntohs(ip->ip_len), M_TRAILINGSPACE(mcopy)); 959 mcopy->m_pkthdr.len = mcopy->m_len; 960 m_copydata(m, 0, mcopy->m_len, mtod(mcopy, caddr_t)); 961 } 962 #ifdef IPSTEALTH 963 if (V_ipstealth == 0) 964 #endif 965 ip->ip_ttl -= IPTTLDEC; 966 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 967 if (IPSEC_ENABLED(ipv4)) { 968 if ((error = IPSEC_FORWARD(ipv4, m)) != 0) { 969 /* mbuf consumed by IPsec */ 970 RO_NHFREE(&ro); 971 m_freem(mcopy); 972 if (error != EINPROGRESS) 973 IPSTAT_INC(ips_cantforward); 974 return; 975 } 976 /* No IPsec processing required */ 977 } 978 #endif /* IPSEC */ 979 /* 980 * If forwarding packet using same interface that it came in on, 981 * perhaps should send a redirect to sender to shortcut a hop. 982 * Only send redirect if source is sending directly to us, 983 * and if packet was not source routed (or has any options). 984 * Also, don't send redirect if forwarding using a default route 985 * or a route modified by a redirect. 986 */ 987 dest.s_addr = 0; 988 if (!srcrt && V_ipsendredirects && 989 ia != NULL && ia->ia_ifp == m->m_pkthdr.rcvif) { 990 struct nhop_object *nh; 991 992 nh = ro.ro_nh; 993 994 if (nh != NULL && ((nh->nh_flags & (NHF_REDIRECT|NHF_DEFAULT)) == 0)) { 995 struct in_ifaddr *nh_ia = (struct in_ifaddr *)(nh->nh_ifa); 996 u_long src = ntohl(ip->ip_src.s_addr); 997 998 if (nh_ia != NULL && 999 (src & nh_ia->ia_subnetmask) == nh_ia->ia_subnet) { 1000 /* Router requirements says to only send host redirects */ 1001 type = ICMP_REDIRECT; 1002 code = ICMP_REDIRECT_HOST; 1003 if (nh->nh_flags & NHF_GATEWAY) { 1004 if (nh->gw_sa.sa_family == AF_INET) 1005 dest.s_addr = nh->gw4_sa.sin_addr.s_addr; 1006 else /* Do not redirect in case gw is AF_INET6 */ 1007 type = 0; 1008 } else 1009 dest.s_addr = ip->ip_dst.s_addr; 1010 } 1011 } 1012 } 1013 1014 error = ip_output(m, NULL, &ro, IP_FORWARDING, NULL, NULL); 1015 1016 if (error == EMSGSIZE && ro.ro_nh) 1017 mtu = ro.ro_nh->nh_mtu; 1018 RO_NHFREE(&ro); 1019 1020 if (error) 1021 IPSTAT_INC(ips_cantforward); 1022 else { 1023 IPSTAT_INC(ips_forward); 1024 if (type) 1025 IPSTAT_INC(ips_redirectsent); 1026 else { 1027 if (mcopy) 1028 m_freem(mcopy); 1029 return; 1030 } 1031 } 1032 if (mcopy == NULL) 1033 return; 1034 1035 switch (error) { 1036 case 0: /* forwarded, but need redirect */ 1037 /* type, code set above */ 1038 break; 1039 1040 case ENETUNREACH: 1041 case EHOSTUNREACH: 1042 case ENETDOWN: 1043 case EHOSTDOWN: 1044 default: 1045 type = ICMP_UNREACH; 1046 code = ICMP_UNREACH_HOST; 1047 break; 1048 1049 case EMSGSIZE: 1050 type = ICMP_UNREACH; 1051 code = ICMP_UNREACH_NEEDFRAG; 1052 /* 1053 * If the MTU was set before make sure we are below the 1054 * interface MTU. 1055 * If the MTU wasn't set before use the interface mtu or 1056 * fall back to the next smaller mtu step compared to the 1057 * current packet size. 1058 */ 1059 if (mtu != 0) { 1060 if (ia != NULL) 1061 mtu = min(mtu, ia->ia_ifp->if_mtu); 1062 } else { 1063 if (ia != NULL) 1064 mtu = ia->ia_ifp->if_mtu; 1065 else 1066 mtu = ip_next_mtu(ntohs(ip->ip_len), 0); 1067 } 1068 IPSTAT_INC(ips_cantfrag); 1069 break; 1070 1071 case ENOBUFS: 1072 case EACCES: /* ipfw denied packet */ 1073 m_freem(mcopy); 1074 return; 1075 } 1076 icmp_error(mcopy, type, code, dest.s_addr, mtu); 1077 } 1078 1079 #define CHECK_SO_CT(sp, ct) \ 1080 (((sp->so_options & SO_TIMESTAMP) && (sp->so_ts_clock == ct)) ? 1 : 0) 1081 1082 void 1083 ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip, 1084 struct mbuf *m) 1085 { 1086 bool stamped; 1087 1088 stamped = false; 1089 if ((inp->inp_socket->so_options & SO_BINTIME) || 1090 CHECK_SO_CT(inp->inp_socket, SO_TS_BINTIME)) { 1091 struct bintime boottimebin, bt; 1092 struct timespec ts1; 1093 1094 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1095 M_TSTMP)) { 1096 mbuf_tstmp2timespec(m, &ts1); 1097 timespec2bintime(&ts1, &bt); 1098 getboottimebin(&boottimebin); 1099 bintime_add(&bt, &boottimebin); 1100 } else { 1101 bintime(&bt); 1102 } 1103 *mp = sbcreatecontrol(&bt, sizeof(bt), SCM_BINTIME, 1104 SOL_SOCKET, M_NOWAIT); 1105 if (*mp != NULL) { 1106 mp = &(*mp)->m_next; 1107 stamped = true; 1108 } 1109 } 1110 if (CHECK_SO_CT(inp->inp_socket, SO_TS_REALTIME_MICRO)) { 1111 struct bintime boottimebin, bt1; 1112 struct timespec ts1; 1113 struct timeval tv; 1114 1115 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1116 M_TSTMP)) { 1117 mbuf_tstmp2timespec(m, &ts1); 1118 timespec2bintime(&ts1, &bt1); 1119 getboottimebin(&boottimebin); 1120 bintime_add(&bt1, &boottimebin); 1121 bintime2timeval(&bt1, &tv); 1122 } else { 1123 microtime(&tv); 1124 } 1125 *mp = sbcreatecontrol((caddr_t)&tv, sizeof(tv), SCM_TIMESTAMP, 1126 SOL_SOCKET, M_NOWAIT); 1127 if (*mp != NULL) { 1128 mp = &(*mp)->m_next; 1129 stamped = true; 1130 } 1131 } else if (CHECK_SO_CT(inp->inp_socket, SO_TS_REALTIME)) { 1132 struct bintime boottimebin; 1133 struct timespec ts, ts1; 1134 1135 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1136 M_TSTMP)) { 1137 mbuf_tstmp2timespec(m, &ts); 1138 getboottimebin(&boottimebin); 1139 bintime2timespec(&boottimebin, &ts1); 1140 timespecadd(&ts, &ts1, &ts); 1141 } else { 1142 nanotime(&ts); 1143 } 1144 *mp = sbcreatecontrol(&ts, sizeof(ts), SCM_REALTIME, 1145 SOL_SOCKET, M_NOWAIT); 1146 if (*mp != NULL) { 1147 mp = &(*mp)->m_next; 1148 stamped = true; 1149 } 1150 } else if (CHECK_SO_CT(inp->inp_socket, SO_TS_MONOTONIC)) { 1151 struct timespec ts; 1152 1153 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1154 M_TSTMP)) 1155 mbuf_tstmp2timespec(m, &ts); 1156 else 1157 nanouptime(&ts); 1158 *mp = sbcreatecontrol(&ts, sizeof(ts), SCM_MONOTONIC, 1159 SOL_SOCKET, M_NOWAIT); 1160 if (*mp != NULL) { 1161 mp = &(*mp)->m_next; 1162 stamped = true; 1163 } 1164 } 1165 if (stamped && (m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1166 M_TSTMP)) { 1167 struct sock_timestamp_info sti; 1168 1169 bzero(&sti, sizeof(sti)); 1170 sti.st_info_flags = ST_INFO_HW; 1171 if ((m->m_flags & M_TSTMP_HPREC) != 0) 1172 sti.st_info_flags |= ST_INFO_HW_HPREC; 1173 *mp = sbcreatecontrol(&sti, sizeof(sti), SCM_TIME_INFO, 1174 SOL_SOCKET, M_NOWAIT); 1175 if (*mp != NULL) 1176 mp = &(*mp)->m_next; 1177 } 1178 if (inp->inp_flags & INP_RECVDSTADDR) { 1179 *mp = sbcreatecontrol(&ip->ip_dst, sizeof(struct in_addr), 1180 IP_RECVDSTADDR, IPPROTO_IP, M_NOWAIT); 1181 if (*mp) 1182 mp = &(*mp)->m_next; 1183 } 1184 if (inp->inp_flags & INP_RECVTTL) { 1185 *mp = sbcreatecontrol(&ip->ip_ttl, sizeof(u_char), IP_RECVTTL, 1186 IPPROTO_IP, M_NOWAIT); 1187 if (*mp) 1188 mp = &(*mp)->m_next; 1189 } 1190 #ifdef notyet 1191 /* XXX 1192 * Moving these out of udp_input() made them even more broken 1193 * than they already were. 1194 */ 1195 /* options were tossed already */ 1196 if (inp->inp_flags & INP_RECVOPTS) { 1197 *mp = sbcreatecontrol(opts_deleted_above, 1198 sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP, M_NOWAIT); 1199 if (*mp) 1200 mp = &(*mp)->m_next; 1201 } 1202 /* ip_srcroute doesn't do what we want here, need to fix */ 1203 if (inp->inp_flags & INP_RECVRETOPTS) { 1204 *mp = sbcreatecontrol(ip_srcroute(m), sizeof(struct in_addr), 1205 IP_RECVRETOPTS, IPPROTO_IP, M_NOWAIT); 1206 if (*mp) 1207 mp = &(*mp)->m_next; 1208 } 1209 #endif 1210 if (inp->inp_flags & INP_RECVIF) { 1211 struct ifnet *ifp; 1212 struct sdlbuf { 1213 struct sockaddr_dl sdl; 1214 u_char pad[32]; 1215 } sdlbuf; 1216 struct sockaddr_dl *sdp; 1217 struct sockaddr_dl *sdl2 = &sdlbuf.sdl; 1218 1219 if ((ifp = m->m_pkthdr.rcvif)) { 1220 sdp = (struct sockaddr_dl *)ifp->if_addr->ifa_addr; 1221 /* 1222 * Change our mind and don't try copy. 1223 */ 1224 if (sdp->sdl_family != AF_LINK || 1225 sdp->sdl_len > sizeof(sdlbuf)) { 1226 goto makedummy; 1227 } 1228 bcopy(sdp, sdl2, sdp->sdl_len); 1229 } else { 1230 makedummy: 1231 sdl2->sdl_len = 1232 offsetof(struct sockaddr_dl, sdl_data[0]); 1233 sdl2->sdl_family = AF_LINK; 1234 sdl2->sdl_index = 0; 1235 sdl2->sdl_nlen = sdl2->sdl_alen = sdl2->sdl_slen = 0; 1236 } 1237 *mp = sbcreatecontrol(sdl2, sdl2->sdl_len, IP_RECVIF, 1238 IPPROTO_IP, M_NOWAIT); 1239 if (*mp) 1240 mp = &(*mp)->m_next; 1241 } 1242 if (inp->inp_flags & INP_RECVTOS) { 1243 *mp = sbcreatecontrol(&ip->ip_tos, sizeof(u_char), IP_RECVTOS, 1244 IPPROTO_IP, M_NOWAIT); 1245 if (*mp) 1246 mp = &(*mp)->m_next; 1247 } 1248 1249 if (inp->inp_flags2 & INP_RECVFLOWID) { 1250 uint32_t flowid, flow_type; 1251 1252 flowid = m->m_pkthdr.flowid; 1253 flow_type = M_HASHTYPE_GET(m); 1254 1255 /* 1256 * XXX should handle the failure of one or the 1257 * other - don't populate both? 1258 */ 1259 *mp = sbcreatecontrol(&flowid, sizeof(uint32_t), IP_FLOWID, 1260 IPPROTO_IP, M_NOWAIT); 1261 if (*mp) 1262 mp = &(*mp)->m_next; 1263 *mp = sbcreatecontrol(&flow_type, sizeof(uint32_t), 1264 IP_FLOWTYPE, IPPROTO_IP, M_NOWAIT); 1265 if (*mp) 1266 mp = &(*mp)->m_next; 1267 } 1268 1269 #ifdef RSS 1270 if (inp->inp_flags2 & INP_RECVRSSBUCKETID) { 1271 uint32_t flowid, flow_type; 1272 uint32_t rss_bucketid; 1273 1274 flowid = m->m_pkthdr.flowid; 1275 flow_type = M_HASHTYPE_GET(m); 1276 1277 if (rss_hash2bucket(flowid, flow_type, &rss_bucketid) == 0) { 1278 *mp = sbcreatecontrol(&rss_bucketid, sizeof(uint32_t), 1279 IP_RSSBUCKETID, IPPROTO_IP, M_NOWAIT); 1280 if (*mp) 1281 mp = &(*mp)->m_next; 1282 } 1283 } 1284 #endif 1285 } 1286 1287 /* 1288 * XXXRW: Multicast routing code in ip_mroute.c is generally MPSAFE, but the 1289 * ip_rsvp and ip_rsvp_on variables need to be interlocked with rsvp_on 1290 * locking. This code remains in ip_input.c as ip_mroute.c is optionally 1291 * compiled. 1292 */ 1293 VNET_DEFINE_STATIC(int, ip_rsvp_on); 1294 VNET_DEFINE(struct socket *, ip_rsvpd); 1295 1296 #define V_ip_rsvp_on VNET(ip_rsvp_on) 1297 1298 int 1299 ip_rsvp_init(struct socket *so) 1300 { 1301 1302 if (V_ip_rsvpd != NULL) 1303 return EADDRINUSE; 1304 1305 V_ip_rsvpd = so; 1306 /* 1307 * This may seem silly, but we need to be sure we don't over-increment 1308 * the RSVP counter, in case something slips up. 1309 */ 1310 if (!V_ip_rsvp_on) { 1311 V_ip_rsvp_on = 1; 1312 V_rsvp_on++; 1313 } 1314 1315 return 0; 1316 } 1317 1318 int 1319 ip_rsvp_done(void) 1320 { 1321 1322 V_ip_rsvpd = NULL; 1323 /* 1324 * This may seem silly, but we need to be sure we don't over-decrement 1325 * the RSVP counter, in case something slips up. 1326 */ 1327 if (V_ip_rsvp_on) { 1328 V_ip_rsvp_on = 0; 1329 V_rsvp_on--; 1330 } 1331 return 0; 1332 } 1333 1334 int 1335 rsvp_input(struct mbuf **mp, int *offp, int proto) 1336 { 1337 struct mbuf *m; 1338 1339 m = *mp; 1340 *mp = NULL; 1341 1342 if (rsvp_input_p) { /* call the real one if loaded */ 1343 *mp = m; 1344 rsvp_input_p(mp, offp, proto); 1345 return (IPPROTO_DONE); 1346 } 1347 1348 /* Can still get packets with rsvp_on = 0 if there is a local member 1349 * of the group to which the RSVP packet is addressed. But in this 1350 * case we want to throw the packet away. 1351 */ 1352 1353 if (!V_rsvp_on) { 1354 m_freem(m); 1355 return (IPPROTO_DONE); 1356 } 1357 1358 if (V_ip_rsvpd != NULL) { 1359 *mp = m; 1360 rip_input(mp, offp, proto); 1361 return (IPPROTO_DONE); 1362 } 1363 /* Drop the packet */ 1364 m_freem(m); 1365 return (IPPROTO_DONE); 1366 }
Cache object: 3205072e9a047f868976f60983291d89
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