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/if_private.h> 67 #include <net/pfil.h> 68 #include <net/route.h> 69 #include <net/route/nhop.h> 70 #include <net/netisr.h> 71 #include <net/rss_config.h> 72 #include <net/vnet.h> 73 74 #include <netinet/in.h> 75 #include <netinet/in_kdtrace.h> 76 #include <netinet/in_systm.h> 77 #include <netinet/in_var.h> 78 #include <netinet/ip.h> 79 #include <netinet/in_fib.h> 80 #include <netinet/in_pcb.h> 81 #include <netinet/ip_var.h> 82 #include <netinet/ip_encap.h> 83 #include <netinet/ip_fw.h> 84 #include <netinet/ip_icmp.h> 85 #include <netinet/igmp_var.h> 86 #include <netinet/ip_options.h> 87 #include <machine/in_cksum.h> 88 #include <netinet/ip_carp.h> 89 #include <netinet/in_rss.h> 90 #ifdef SCTP 91 #include <netinet/sctp_var.h> 92 #endif 93 94 #include <netipsec/ipsec_support.h> 95 96 #include <sys/socketvar.h> 97 98 #include <security/mac/mac_framework.h> 99 100 #ifdef CTASSERT 101 CTASSERT(sizeof(struct ip) == 20); 102 #endif 103 104 /* IP reassembly functions are defined in ip_reass.c. */ 105 extern void ipreass_init(void); 106 extern void ipreass_vnet_init(void); 107 #ifdef VIMAGE 108 extern void ipreass_destroy(void); 109 #endif 110 111 VNET_DEFINE(int, rsvp_on); 112 113 VNET_DEFINE(int, ipforwarding); 114 SYSCTL_INT(_net_inet_ip, IPCTL_FORWARDING, forwarding, CTLFLAG_VNET | CTLFLAG_RW, 115 &VNET_NAME(ipforwarding), 0, 116 "Enable IP forwarding between interfaces"); 117 118 /* 119 * Respond with an ICMP host redirect when we forward a packet out of 120 * the same interface on which it was received. See RFC 792. 121 */ 122 VNET_DEFINE(int, ipsendredirects) = 1; 123 SYSCTL_INT(_net_inet_ip, IPCTL_SENDREDIRECTS, redirect, CTLFLAG_VNET | CTLFLAG_RW, 124 &VNET_NAME(ipsendredirects), 0, 125 "Enable sending IP redirects"); 126 127 VNET_DEFINE_STATIC(bool, ip_strong_es) = false; 128 #define V_ip_strong_es VNET(ip_strong_es) 129 SYSCTL_BOOL(_net_inet_ip, OID_AUTO, rfc1122_strong_es, 130 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip_strong_es), false, 131 "Packet's IP destination address must match address on arrival interface"); 132 133 VNET_DEFINE_STATIC(bool, ip_sav) = true; 134 #define V_ip_sav VNET(ip_sav) 135 SYSCTL_BOOL(_net_inet_ip, OID_AUTO, source_address_validation, 136 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip_sav), true, 137 "Drop incoming packets with source address that is a local address"); 138 139 /* Packet filter hooks */ 140 VNET_DEFINE(pfil_head_t, inet_pfil_head); 141 VNET_DEFINE(pfil_head_t, inet_local_pfil_head); 142 143 static struct netisr_handler ip_nh = { 144 .nh_name = "ip", 145 .nh_handler = ip_input, 146 .nh_proto = NETISR_IP, 147 #ifdef RSS 148 .nh_m2cpuid = rss_soft_m2cpuid_v4, 149 .nh_policy = NETISR_POLICY_CPU, 150 .nh_dispatch = NETISR_DISPATCH_HYBRID, 151 #else 152 .nh_policy = NETISR_POLICY_FLOW, 153 #endif 154 }; 155 156 #ifdef RSS 157 /* 158 * Directly dispatched frames are currently assumed 159 * to have a flowid already calculated. 160 * 161 * It should likely have something that assert it 162 * actually has valid flow details. 163 */ 164 static struct netisr_handler ip_direct_nh = { 165 .nh_name = "ip_direct", 166 .nh_handler = ip_direct_input, 167 .nh_proto = NETISR_IP_DIRECT, 168 .nh_m2cpuid = rss_soft_m2cpuid_v4, 169 .nh_policy = NETISR_POLICY_CPU, 170 .nh_dispatch = NETISR_DISPATCH_HYBRID, 171 }; 172 #endif 173 174 ipproto_input_t *ip_protox[IPPROTO_MAX] = { 175 [0 ... IPPROTO_MAX - 1] = rip_input }; 176 ipproto_ctlinput_t *ip_ctlprotox[IPPROTO_MAX] = { 177 [0 ... IPPROTO_MAX - 1] = rip_ctlinput }; 178 179 VNET_DEFINE(struct in_ifaddrhead, in_ifaddrhead); /* first inet address */ 180 VNET_DEFINE(struct in_ifaddrhashhead *, in_ifaddrhashtbl); /* inet addr hash table */ 181 VNET_DEFINE(u_long, in_ifaddrhmask); /* mask for hash table */ 182 183 /* Make sure it is safe to use hashinit(9) on CK_LIST. */ 184 CTASSERT(sizeof(struct in_ifaddrhashhead) == sizeof(LIST_HEAD(, in_addr))); 185 186 #ifdef IPCTL_DEFMTU 187 SYSCTL_INT(_net_inet_ip, IPCTL_DEFMTU, mtu, CTLFLAG_RW, 188 &ip_mtu, 0, "Default MTU"); 189 #endif 190 191 #ifdef IPSTEALTH 192 VNET_DEFINE(int, ipstealth); 193 SYSCTL_INT(_net_inet_ip, OID_AUTO, stealth, CTLFLAG_VNET | CTLFLAG_RW, 194 &VNET_NAME(ipstealth), 0, 195 "IP stealth mode, no TTL decrementation on forwarding"); 196 #endif 197 198 /* 199 * IP statistics are stored in the "array" of counter(9)s. 200 */ 201 VNET_PCPUSTAT_DEFINE(struct ipstat, ipstat); 202 VNET_PCPUSTAT_SYSINIT(ipstat); 203 SYSCTL_VNET_PCPUSTAT(_net_inet_ip, IPCTL_STATS, stats, struct ipstat, ipstat, 204 "IP statistics (struct ipstat, netinet/ip_var.h)"); 205 206 #ifdef VIMAGE 207 VNET_PCPUSTAT_SYSUNINIT(ipstat); 208 #endif /* VIMAGE */ 209 210 /* 211 * Kernel module interface for updating ipstat. The argument is an index 212 * into ipstat treated as an array. 213 */ 214 void 215 kmod_ipstat_inc(int statnum) 216 { 217 218 counter_u64_add(VNET(ipstat)[statnum], 1); 219 } 220 221 void 222 kmod_ipstat_dec(int statnum) 223 { 224 225 counter_u64_add(VNET(ipstat)[statnum], -1); 226 } 227 228 static int 229 sysctl_netinet_intr_queue_maxlen(SYSCTL_HANDLER_ARGS) 230 { 231 int error, qlimit; 232 233 netisr_getqlimit(&ip_nh, &qlimit); 234 error = sysctl_handle_int(oidp, &qlimit, 0, req); 235 if (error || !req->newptr) 236 return (error); 237 if (qlimit < 1) 238 return (EINVAL); 239 return (netisr_setqlimit(&ip_nh, qlimit)); 240 } 241 SYSCTL_PROC(_net_inet_ip, IPCTL_INTRQMAXLEN, intr_queue_maxlen, 242 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 0, 243 sysctl_netinet_intr_queue_maxlen, "I", 244 "Maximum size of the IP input queue"); 245 246 static int 247 sysctl_netinet_intr_queue_drops(SYSCTL_HANDLER_ARGS) 248 { 249 u_int64_t qdrops_long; 250 int error, qdrops; 251 252 netisr_getqdrops(&ip_nh, &qdrops_long); 253 qdrops = qdrops_long; 254 error = sysctl_handle_int(oidp, &qdrops, 0, req); 255 if (error || !req->newptr) 256 return (error); 257 if (qdrops != 0) 258 return (EINVAL); 259 netisr_clearqdrops(&ip_nh); 260 return (0); 261 } 262 263 SYSCTL_PROC(_net_inet_ip, IPCTL_INTRQDROPS, intr_queue_drops, 264 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 265 0, 0, sysctl_netinet_intr_queue_drops, "I", 266 "Number of packets dropped from the IP input queue"); 267 268 #ifdef RSS 269 static int 270 sysctl_netinet_intr_direct_queue_maxlen(SYSCTL_HANDLER_ARGS) 271 { 272 int error, qlimit; 273 274 netisr_getqlimit(&ip_direct_nh, &qlimit); 275 error = sysctl_handle_int(oidp, &qlimit, 0, req); 276 if (error || !req->newptr) 277 return (error); 278 if (qlimit < 1) 279 return (EINVAL); 280 return (netisr_setqlimit(&ip_direct_nh, qlimit)); 281 } 282 SYSCTL_PROC(_net_inet_ip, IPCTL_INTRDQMAXLEN, intr_direct_queue_maxlen, 283 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 284 0, 0, sysctl_netinet_intr_direct_queue_maxlen, 285 "I", "Maximum size of the IP direct input queue"); 286 287 static int 288 sysctl_netinet_intr_direct_queue_drops(SYSCTL_HANDLER_ARGS) 289 { 290 u_int64_t qdrops_long; 291 int error, qdrops; 292 293 netisr_getqdrops(&ip_direct_nh, &qdrops_long); 294 qdrops = qdrops_long; 295 error = sysctl_handle_int(oidp, &qdrops, 0, req); 296 if (error || !req->newptr) 297 return (error); 298 if (qdrops != 0) 299 return (EINVAL); 300 netisr_clearqdrops(&ip_direct_nh); 301 return (0); 302 } 303 304 SYSCTL_PROC(_net_inet_ip, IPCTL_INTRDQDROPS, intr_direct_queue_drops, 305 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 0, 306 sysctl_netinet_intr_direct_queue_drops, "I", 307 "Number of packets dropped from the IP direct input queue"); 308 #endif /* RSS */ 309 310 /* 311 * IP initialization: fill in IP protocol switch table. 312 * All protocols not implemented in kernel go to raw IP protocol handler. 313 */ 314 static void 315 ip_vnet_init(void *arg __unused) 316 { 317 struct pfil_head_args args; 318 319 CK_STAILQ_INIT(&V_in_ifaddrhead); 320 V_in_ifaddrhashtbl = hashinit(INADDR_NHASH, M_IFADDR, &V_in_ifaddrhmask); 321 322 /* Initialize IP reassembly queue. */ 323 ipreass_vnet_init(); 324 325 /* Initialize packet filter hooks. */ 326 args.pa_version = PFIL_VERSION; 327 args.pa_flags = PFIL_IN | PFIL_OUT; 328 args.pa_type = PFIL_TYPE_IP4; 329 args.pa_headname = PFIL_INET_NAME; 330 V_inet_pfil_head = pfil_head_register(&args); 331 332 args.pa_flags = PFIL_OUT; 333 args.pa_headname = PFIL_INET_LOCAL_NAME; 334 V_inet_local_pfil_head = pfil_head_register(&args); 335 336 if (hhook_head_register(HHOOK_TYPE_IPSEC_IN, AF_INET, 337 &V_ipsec_hhh_in[HHOOK_IPSEC_INET], 338 HHOOK_WAITOK | HHOOK_HEADISINVNET) != 0) 339 printf("%s: WARNING: unable to register input helper hook\n", 340 __func__); 341 if (hhook_head_register(HHOOK_TYPE_IPSEC_OUT, AF_INET, 342 &V_ipsec_hhh_out[HHOOK_IPSEC_INET], 343 HHOOK_WAITOK | HHOOK_HEADISINVNET) != 0) 344 printf("%s: WARNING: unable to register output helper hook\n", 345 __func__); 346 347 #ifdef VIMAGE 348 netisr_register_vnet(&ip_nh); 349 #ifdef RSS 350 netisr_register_vnet(&ip_direct_nh); 351 #endif 352 #endif 353 } 354 VNET_SYSINIT(ip_vnet_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH, 355 ip_vnet_init, NULL); 356 357 static void 358 ip_init(const void *unused __unused) 359 { 360 361 ipreass_init(); 362 363 /* 364 * Register statically compiled protocols, that are unlikely to 365 * ever become dynamic. 366 */ 367 IPPROTO_REGISTER(IPPROTO_ICMP, icmp_input, NULL); 368 IPPROTO_REGISTER(IPPROTO_IGMP, igmp_input, NULL); 369 IPPROTO_REGISTER(IPPROTO_RSVP, rsvp_input, NULL); 370 IPPROTO_REGISTER(IPPROTO_IPV4, encap4_input, NULL); 371 IPPROTO_REGISTER(IPPROTO_MOBILE, encap4_input, NULL); 372 IPPROTO_REGISTER(IPPROTO_ETHERIP, encap4_input, NULL); 373 IPPROTO_REGISTER(IPPROTO_GRE, encap4_input, NULL); 374 IPPROTO_REGISTER(IPPROTO_IPV6, encap4_input, NULL); 375 IPPROTO_REGISTER(IPPROTO_PIM, encap4_input, NULL); 376 #ifdef SCTP /* XXX: has a loadable & static version */ 377 IPPROTO_REGISTER(IPPROTO_SCTP, sctp_input, sctp_ctlinput); 378 #endif 379 380 netisr_register(&ip_nh); 381 #ifdef RSS 382 netisr_register(&ip_direct_nh); 383 #endif 384 } 385 SYSINIT(ip_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, ip_init, NULL); 386 387 #ifdef VIMAGE 388 static void 389 ip_destroy(void *unused __unused) 390 { 391 int error; 392 393 #ifdef RSS 394 netisr_unregister_vnet(&ip_direct_nh); 395 #endif 396 netisr_unregister_vnet(&ip_nh); 397 398 pfil_head_unregister(V_inet_pfil_head); 399 error = hhook_head_deregister(V_ipsec_hhh_in[HHOOK_IPSEC_INET]); 400 if (error != 0) { 401 printf("%s: WARNING: unable to deregister input helper hook " 402 "type HHOOK_TYPE_IPSEC_IN, id HHOOK_IPSEC_INET: " 403 "error %d returned\n", __func__, error); 404 } 405 error = hhook_head_deregister(V_ipsec_hhh_out[HHOOK_IPSEC_INET]); 406 if (error != 0) { 407 printf("%s: WARNING: unable to deregister output helper hook " 408 "type HHOOK_TYPE_IPSEC_OUT, id HHOOK_IPSEC_INET: " 409 "error %d returned\n", __func__, error); 410 } 411 412 /* Remove the IPv4 addresses from all interfaces. */ 413 in_ifscrub_all(); 414 415 /* Make sure the IPv4 routes are gone as well. */ 416 rib_flush_routes_family(AF_INET); 417 418 /* Destroy IP reassembly queue. */ 419 ipreass_destroy(); 420 421 /* Cleanup in_ifaddr hash table; should be empty. */ 422 hashdestroy(V_in_ifaddrhashtbl, M_IFADDR, V_in_ifaddrhmask); 423 } 424 425 VNET_SYSUNINIT(ip, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, ip_destroy, NULL); 426 #endif 427 428 #ifdef RSS 429 /* 430 * IP direct input routine. 431 * 432 * This is called when reinjecting completed fragments where 433 * all of the previous checking and book-keeping has been done. 434 */ 435 void 436 ip_direct_input(struct mbuf *m) 437 { 438 struct ip *ip; 439 int hlen; 440 441 ip = mtod(m, struct ip *); 442 hlen = ip->ip_hl << 2; 443 444 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 445 if (IPSEC_ENABLED(ipv4)) { 446 if (IPSEC_INPUT(ipv4, m, hlen, ip->ip_p) != 0) 447 return; 448 } 449 #endif /* IPSEC */ 450 IPSTAT_INC(ips_delivered); 451 ip_protox[ip->ip_p](&m, &hlen, ip->ip_p); 452 } 453 #endif 454 455 /* 456 * Ip input routine. Checksum and byte swap header. If fragmented 457 * try to reassemble. Process options. Pass to next level. 458 */ 459 void 460 ip_input(struct mbuf *m) 461 { 462 struct ip *ip = NULL; 463 struct in_ifaddr *ia = NULL; 464 struct ifaddr *ifa; 465 struct ifnet *ifp; 466 int hlen = 0; 467 uint16_t sum, ip_len; 468 int dchg = 0; /* dest changed after fw */ 469 struct in_addr odst; /* original dst address */ 470 bool strong_es; 471 472 M_ASSERTPKTHDR(m); 473 NET_EPOCH_ASSERT(); 474 475 if (m->m_flags & M_FASTFWD_OURS) { 476 m->m_flags &= ~M_FASTFWD_OURS; 477 /* Set up some basics that will be used later. */ 478 ip = mtod(m, struct ip *); 479 hlen = ip->ip_hl << 2; 480 ip_len = ntohs(ip->ip_len); 481 goto ours; 482 } 483 484 IPSTAT_INC(ips_total); 485 486 if (__predict_false(m->m_pkthdr.len < sizeof(struct ip))) 487 goto tooshort; 488 489 if (m->m_len < sizeof(struct ip)) { 490 m = m_pullup(m, sizeof(struct ip)); 491 if (__predict_false(m == NULL)) { 492 IPSTAT_INC(ips_toosmall); 493 return; 494 } 495 } 496 ip = mtod(m, struct ip *); 497 498 if (__predict_false(ip->ip_v != IPVERSION)) { 499 IPSTAT_INC(ips_badvers); 500 goto bad; 501 } 502 503 hlen = ip->ip_hl << 2; 504 if (__predict_false(hlen < sizeof(struct ip))) { /* minimum header length */ 505 IPSTAT_INC(ips_badhlen); 506 goto bad; 507 } 508 if (hlen > m->m_len) { 509 m = m_pullup(m, hlen); 510 if (__predict_false(m == NULL)) { 511 IPSTAT_INC(ips_badhlen); 512 return; 513 } 514 ip = mtod(m, struct ip *); 515 } 516 517 IP_PROBE(receive, NULL, NULL, ip, m->m_pkthdr.rcvif, ip, NULL); 518 519 /* IN_LOOPBACK must not appear on the wire - RFC1122 */ 520 ifp = m->m_pkthdr.rcvif; 521 if (IN_LOOPBACK(ntohl(ip->ip_dst.s_addr)) || 522 IN_LOOPBACK(ntohl(ip->ip_src.s_addr))) { 523 if ((ifp->if_flags & IFF_LOOPBACK) == 0) { 524 IPSTAT_INC(ips_badaddr); 525 goto bad; 526 } 527 } 528 /* The unspecified address can appear only as a src address - RFC1122 */ 529 if (__predict_false(ntohl(ip->ip_dst.s_addr) == INADDR_ANY)) { 530 IPSTAT_INC(ips_badaddr); 531 goto bad; 532 } 533 534 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) { 535 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID); 536 } else { 537 if (hlen == sizeof(struct ip)) { 538 sum = in_cksum_hdr(ip); 539 } else { 540 sum = in_cksum(m, hlen); 541 } 542 } 543 if (__predict_false(sum)) { 544 IPSTAT_INC(ips_badsum); 545 goto bad; 546 } 547 548 ip_len = ntohs(ip->ip_len); 549 if (__predict_false(ip_len < hlen)) { 550 IPSTAT_INC(ips_badlen); 551 goto bad; 552 } 553 554 /* 555 * Check that the amount of data in the buffers 556 * is as at least much as the IP header would have us expect. 557 * Trim mbufs if longer than we expect. 558 * Drop packet if shorter than we expect. 559 */ 560 if (__predict_false(m->m_pkthdr.len < ip_len)) { 561 tooshort: 562 IPSTAT_INC(ips_tooshort); 563 goto bad; 564 } 565 if (m->m_pkthdr.len > ip_len) { 566 if (m->m_len == m->m_pkthdr.len) { 567 m->m_len = ip_len; 568 m->m_pkthdr.len = ip_len; 569 } else 570 m_adj(m, ip_len - m->m_pkthdr.len); 571 } 572 573 /* 574 * Try to forward the packet, but if we fail continue. 575 * ip_tryforward() may generate redirects these days. 576 * XXX the logic below falling through to normal processing 577 * if redirects are required should be revisited as well. 578 * ip_tryforward() does inbound and outbound packet firewall 579 * processing. If firewall has decided that destination becomes 580 * our local address, it sets M_FASTFWD_OURS flag. In this 581 * case skip another inbound firewall processing and update 582 * ip pointer. 583 */ 584 if (V_ipforwarding != 0 585 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 586 && (!IPSEC_ENABLED(ipv4) || 587 IPSEC_CAPS(ipv4, m, IPSEC_CAP_OPERABLE) == 0) 588 #endif 589 ) { 590 /* 591 * ip_dooptions() was run so we can ignore the source route (or 592 * any IP options case) case for redirects in ip_tryforward(). 593 */ 594 if ((m = ip_tryforward(m)) == NULL) 595 return; 596 if (m->m_flags & M_FASTFWD_OURS) { 597 m->m_flags &= ~M_FASTFWD_OURS; 598 ip = mtod(m, struct ip *); 599 goto ours; 600 } 601 } 602 603 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 604 /* 605 * Bypass packet filtering for packets previously handled by IPsec. 606 */ 607 if (IPSEC_ENABLED(ipv4) && 608 IPSEC_CAPS(ipv4, m, IPSEC_CAP_BYPASS_FILTER) != 0) 609 goto passin; 610 #endif 611 612 /* 613 * Run through list of hooks for input packets. 614 * 615 * NB: Beware of the destination address changing (e.g. 616 * by NAT rewriting). When this happens, tell 617 * ip_forward to do the right thing. 618 */ 619 620 /* Jump over all PFIL processing if hooks are not active. */ 621 if (!PFIL_HOOKED_IN(V_inet_pfil_head)) 622 goto passin; 623 624 odst = ip->ip_dst; 625 if (pfil_mbuf_in(V_inet_pfil_head, &m, ifp, NULL) != 626 PFIL_PASS) 627 return; 628 if (m == NULL) /* consumed by filter */ 629 return; 630 631 ip = mtod(m, struct ip *); 632 dchg = (odst.s_addr != ip->ip_dst.s_addr); 633 634 if (m->m_flags & M_FASTFWD_OURS) { 635 m->m_flags &= ~M_FASTFWD_OURS; 636 goto ours; 637 } 638 if (m->m_flags & M_IP_NEXTHOP) { 639 if (m_tag_find(m, PACKET_TAG_IPFORWARD, NULL) != NULL) { 640 /* 641 * Directly ship the packet on. This allows 642 * forwarding packets originally destined to us 643 * to some other directly connected host. 644 */ 645 ip_forward(m, 1); 646 return; 647 } 648 } 649 passin: 650 651 /* 652 * Process options and, if not destined for us, 653 * ship it on. ip_dooptions returns 1 when an 654 * error was detected (causing an icmp message 655 * to be sent and the original packet to be freed). 656 */ 657 if (hlen > sizeof (struct ip) && ip_dooptions(m, 0)) 658 return; 659 660 /* greedy RSVP, snatches any PATH packet of the RSVP protocol and no 661 * matter if it is destined to another node, or whether it is 662 * a multicast one, RSVP wants it! and prevents it from being forwarded 663 * anywhere else. Also checks if the rsvp daemon is running before 664 * grabbing the packet. 665 */ 666 if (ip->ip_p == IPPROTO_RSVP && V_rsvp_on) 667 goto ours; 668 669 /* 670 * Check our list of addresses, to see if the packet is for us. 671 * If we don't have any addresses, assume any unicast packet 672 * we receive might be for us (and let the upper layers deal 673 * with it). 674 */ 675 if (CK_STAILQ_EMPTY(&V_in_ifaddrhead) && 676 (m->m_flags & (M_MCAST|M_BCAST)) == 0) 677 goto ours; 678 679 /* 680 * Enable a consistency check between the destination address 681 * and the arrival interface for a unicast packet (the RFC 1122 682 * strong ES model) with a list of additional predicates: 683 * - if IP forwarding is disabled 684 * - the packet is not locally generated 685 * - the packet is not subject to 'ipfw fwd' 686 * - Interface is not running CARP. If the packet got here, we already 687 * checked it with carp_iamatch() and carp_forus(). 688 */ 689 strong_es = V_ip_strong_es && (V_ipforwarding == 0) && 690 ((ifp->if_flags & IFF_LOOPBACK) == 0) && 691 ifp->if_carp == NULL && (dchg == 0); 692 693 /* 694 * Check for exact addresses in the hash bucket. 695 */ 696 CK_LIST_FOREACH(ia, INADDR_HASH(ip->ip_dst.s_addr), ia_hash) { 697 if (IA_SIN(ia)->sin_addr.s_addr != ip->ip_dst.s_addr) 698 continue; 699 700 /* 701 * net.inet.ip.rfc1122_strong_es: the address matches, verify 702 * that the packet arrived via the correct interface. 703 */ 704 if (__predict_false(strong_es && ia->ia_ifp != ifp)) { 705 IPSTAT_INC(ips_badaddr); 706 goto bad; 707 } 708 709 /* 710 * net.inet.ip.source_address_validation: drop incoming 711 * packets that pretend to be ours. 712 */ 713 if (V_ip_sav && !(ifp->if_flags & IFF_LOOPBACK) && 714 __predict_false(in_localip_fib(ip->ip_src, ifp->if_fib))) { 715 IPSTAT_INC(ips_badaddr); 716 goto bad; 717 } 718 719 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1); 720 counter_u64_add(ia->ia_ifa.ifa_ibytes, m->m_pkthdr.len); 721 goto ours; 722 } 723 724 /* 725 * Check for broadcast addresses. 726 * 727 * Only accept broadcast packets that arrive via the matching 728 * interface. Reception of forwarded directed broadcasts would 729 * be handled via ip_forward() and ether_output() with the loopback 730 * into the stack for SIMPLEX interfaces handled by ether_output(). 731 */ 732 if (ifp->if_flags & IFF_BROADCAST) { 733 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 734 if (ifa->ifa_addr->sa_family != AF_INET) 735 continue; 736 ia = ifatoia(ifa); 737 if (satosin(&ia->ia_broadaddr)->sin_addr.s_addr == 738 ip->ip_dst.s_addr) { 739 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1); 740 counter_u64_add(ia->ia_ifa.ifa_ibytes, 741 m->m_pkthdr.len); 742 goto ours; 743 } 744 #ifdef BOOTP_COMPAT 745 if (IA_SIN(ia)->sin_addr.s_addr == INADDR_ANY) { 746 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1); 747 counter_u64_add(ia->ia_ifa.ifa_ibytes, 748 m->m_pkthdr.len); 749 goto ours; 750 } 751 #endif 752 } 753 ia = NULL; 754 } 755 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 756 /* 757 * RFC 3927 2.7: Do not forward multicast packets from 758 * IN_LINKLOCAL. 759 */ 760 if (V_ip_mrouter && !IN_LINKLOCAL(ntohl(ip->ip_src.s_addr))) { 761 /* 762 * If we are acting as a multicast router, all 763 * incoming multicast packets are passed to the 764 * kernel-level multicast forwarding function. 765 * The packet is returned (relatively) intact; if 766 * ip_mforward() returns a non-zero value, the packet 767 * must be discarded, else it may be accepted below. 768 */ 769 if (ip_mforward && ip_mforward(ip, ifp, m, 0) != 0) { 770 IPSTAT_INC(ips_cantforward); 771 m_freem(m); 772 return; 773 } 774 775 /* 776 * The process-level routing daemon needs to receive 777 * all multicast IGMP packets, whether or not this 778 * host belongs to their destination groups. 779 */ 780 if (ip->ip_p == IPPROTO_IGMP) { 781 goto ours; 782 } 783 IPSTAT_INC(ips_forward); 784 } 785 /* 786 * Assume the packet is for us, to avoid prematurely taking 787 * a lock on the in_multi hash. Protocols must perform 788 * their own filtering and update statistics accordingly. 789 */ 790 goto ours; 791 } 792 if (ip->ip_dst.s_addr == (u_long)INADDR_BROADCAST) 793 goto ours; 794 if (ip->ip_dst.s_addr == INADDR_ANY) 795 goto ours; 796 /* RFC 3927 2.7: Do not forward packets to or from IN_LINKLOCAL. */ 797 if (IN_LINKLOCAL(ntohl(ip->ip_dst.s_addr)) || 798 IN_LINKLOCAL(ntohl(ip->ip_src.s_addr))) { 799 IPSTAT_INC(ips_cantforward); 800 m_freem(m); 801 return; 802 } 803 804 /* 805 * Not for us; forward if possible and desirable. 806 */ 807 if (V_ipforwarding == 0) { 808 IPSTAT_INC(ips_cantforward); 809 m_freem(m); 810 } else { 811 ip_forward(m, dchg); 812 } 813 return; 814 815 ours: 816 #ifdef IPSTEALTH 817 /* 818 * IPSTEALTH: Process non-routing options only 819 * if the packet is destined for us. 820 */ 821 if (V_ipstealth && hlen > sizeof (struct ip) && ip_dooptions(m, 1)) 822 return; 823 #endif /* IPSTEALTH */ 824 825 /* 826 * We are going to ship the packet to the local protocol stack. Call the 827 * filter again for this 'output' action, allowing redirect-like rules 828 * to adjust the source address. 829 */ 830 if (PFIL_HOOKED_OUT(V_inet_local_pfil_head)) { 831 if (pfil_mbuf_out(V_inet_local_pfil_head, &m, V_loif, NULL) != 832 PFIL_PASS) 833 return; 834 if (m == NULL) /* consumed by filter */ 835 return; 836 ip = mtod(m, struct ip *); 837 } 838 839 /* 840 * Attempt reassembly; if it succeeds, proceed. 841 * ip_reass() will return a different mbuf. 842 */ 843 if (ip->ip_off & htons(IP_MF | IP_OFFMASK)) { 844 /* XXXGL: shouldn't we save & set m_flags? */ 845 m = ip_reass(m); 846 if (m == NULL) 847 return; 848 ip = mtod(m, struct ip *); 849 /* Get the header length of the reassembled packet */ 850 hlen = ip->ip_hl << 2; 851 } 852 853 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 854 if (IPSEC_ENABLED(ipv4)) { 855 if (IPSEC_INPUT(ipv4, m, hlen, ip->ip_p) != 0) 856 return; 857 } 858 #endif /* IPSEC */ 859 860 /* 861 * Switch out to protocol's input routine. 862 */ 863 IPSTAT_INC(ips_delivered); 864 865 ip_protox[ip->ip_p](&m, &hlen, ip->ip_p); 866 return; 867 bad: 868 m_freem(m); 869 } 870 871 int 872 ipproto_register(uint8_t proto, ipproto_input_t input, ipproto_ctlinput_t ctl) 873 { 874 875 MPASS(proto > 0); 876 877 /* 878 * The protocol slot must not be occupied by another protocol 879 * already. An index pointing to rip_input() is unused. 880 */ 881 if (ip_protox[proto] == rip_input) { 882 ip_protox[proto] = input; 883 ip_ctlprotox[proto] = ctl; 884 return (0); 885 } else 886 return (EEXIST); 887 } 888 889 int 890 ipproto_unregister(uint8_t proto) 891 { 892 893 MPASS(proto > 0); 894 895 if (ip_protox[proto] != rip_input) { 896 ip_protox[proto] = rip_input; 897 ip_ctlprotox[proto] = rip_ctlinput; 898 return (0); 899 } else 900 return (ENOENT); 901 } 902 903 /* 904 * Forward a packet. If some error occurs return the sender 905 * an icmp packet. Note we can't always generate a meaningful 906 * icmp message because icmp doesn't have a large enough repertoire 907 * of codes and types. 908 * 909 * If not forwarding, just drop the packet. This could be confusing 910 * if ipforwarding was zero but some routing protocol was advancing 911 * us as a gateway to somewhere. However, we must let the routing 912 * protocol deal with that. 913 * 914 * The srcrt parameter indicates whether the packet is being forwarded 915 * via a source route. 916 */ 917 void 918 ip_forward(struct mbuf *m, int srcrt) 919 { 920 struct ip *ip = mtod(m, struct ip *); 921 struct in_ifaddr *ia; 922 struct mbuf *mcopy; 923 struct sockaddr_in *sin; 924 struct in_addr dest; 925 struct route ro; 926 uint32_t flowid; 927 int error, type = 0, code = 0, mtu = 0; 928 929 NET_EPOCH_ASSERT(); 930 931 if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) { 932 IPSTAT_INC(ips_cantforward); 933 m_freem(m); 934 return; 935 } 936 if ( 937 #ifdef IPSTEALTH 938 V_ipstealth == 0 && 939 #endif 940 ip->ip_ttl <= IPTTLDEC) { 941 icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, 0, 0); 942 return; 943 } 944 945 bzero(&ro, sizeof(ro)); 946 sin = (struct sockaddr_in *)&ro.ro_dst; 947 sin->sin_family = AF_INET; 948 sin->sin_len = sizeof(*sin); 949 sin->sin_addr = ip->ip_dst; 950 flowid = m->m_pkthdr.flowid; 951 ro.ro_nh = fib4_lookup(M_GETFIB(m), ip->ip_dst, 0, NHR_REF, flowid); 952 if (ro.ro_nh != NULL) { 953 ia = ifatoia(ro.ro_nh->nh_ifa); 954 } else 955 ia = NULL; 956 /* 957 * Save the IP header and at most 8 bytes of the payload, 958 * in case we need to generate an ICMP message to the src. 959 * 960 * XXX this can be optimized a lot by saving the data in a local 961 * buffer on the stack (72 bytes at most), and only allocating the 962 * mbuf if really necessary. The vast majority of the packets 963 * are forwarded without having to send an ICMP back (either 964 * because unnecessary, or because rate limited), so we are 965 * really we are wasting a lot of work here. 966 * 967 * We don't use m_copym() because it might return a reference 968 * to a shared cluster. Both this function and ip_output() 969 * assume exclusive access to the IP header in `m', so any 970 * data in a cluster may change before we reach icmp_error(). 971 */ 972 mcopy = m_gethdr(M_NOWAIT, m->m_type); 973 if (mcopy != NULL && !m_dup_pkthdr(mcopy, m, M_NOWAIT)) { 974 /* 975 * It's probably ok if the pkthdr dup fails (because 976 * the deep copy of the tag chain failed), but for now 977 * be conservative and just discard the copy since 978 * code below may some day want the tags. 979 */ 980 m_free(mcopy); 981 mcopy = NULL; 982 } 983 if (mcopy != NULL) { 984 mcopy->m_len = min(ntohs(ip->ip_len), M_TRAILINGSPACE(mcopy)); 985 mcopy->m_pkthdr.len = mcopy->m_len; 986 m_copydata(m, 0, mcopy->m_len, mtod(mcopy, caddr_t)); 987 } 988 #ifdef IPSTEALTH 989 if (V_ipstealth == 0) 990 #endif 991 ip->ip_ttl -= IPTTLDEC; 992 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 993 if (IPSEC_ENABLED(ipv4)) { 994 if ((error = IPSEC_FORWARD(ipv4, m)) != 0) { 995 /* mbuf consumed by IPsec */ 996 RO_NHFREE(&ro); 997 m_freem(mcopy); 998 if (error != EINPROGRESS) 999 IPSTAT_INC(ips_cantforward); 1000 return; 1001 } 1002 /* No IPsec processing required */ 1003 } 1004 #endif /* IPSEC */ 1005 /* 1006 * If forwarding packet using same interface that it came in on, 1007 * perhaps should send a redirect to sender to shortcut a hop. 1008 * Only send redirect if source is sending directly to us, 1009 * and if packet was not source routed (or has any options). 1010 * Also, don't send redirect if forwarding using a default route 1011 * or a route modified by a redirect. 1012 */ 1013 dest.s_addr = 0; 1014 if (!srcrt && V_ipsendredirects && 1015 ia != NULL && ia->ia_ifp == m->m_pkthdr.rcvif) { 1016 struct nhop_object *nh; 1017 1018 nh = ro.ro_nh; 1019 1020 if (nh != NULL && ((nh->nh_flags & (NHF_REDIRECT|NHF_DEFAULT)) == 0)) { 1021 struct in_ifaddr *nh_ia = (struct in_ifaddr *)(nh->nh_ifa); 1022 u_long src = ntohl(ip->ip_src.s_addr); 1023 1024 if (nh_ia != NULL && 1025 (src & nh_ia->ia_subnetmask) == nh_ia->ia_subnet) { 1026 /* Router requirements says to only send host redirects */ 1027 type = ICMP_REDIRECT; 1028 code = ICMP_REDIRECT_HOST; 1029 if (nh->nh_flags & NHF_GATEWAY) { 1030 if (nh->gw_sa.sa_family == AF_INET) 1031 dest.s_addr = nh->gw4_sa.sin_addr.s_addr; 1032 else /* Do not redirect in case gw is AF_INET6 */ 1033 type = 0; 1034 } else 1035 dest.s_addr = ip->ip_dst.s_addr; 1036 } 1037 } 1038 } 1039 1040 error = ip_output(m, NULL, &ro, IP_FORWARDING, NULL, NULL); 1041 1042 if (error == EMSGSIZE && ro.ro_nh) 1043 mtu = ro.ro_nh->nh_mtu; 1044 RO_NHFREE(&ro); 1045 1046 if (error) 1047 IPSTAT_INC(ips_cantforward); 1048 else { 1049 IPSTAT_INC(ips_forward); 1050 if (type) 1051 IPSTAT_INC(ips_redirectsent); 1052 else { 1053 if (mcopy) 1054 m_freem(mcopy); 1055 return; 1056 } 1057 } 1058 if (mcopy == NULL) 1059 return; 1060 1061 switch (error) { 1062 case 0: /* forwarded, but need redirect */ 1063 /* type, code set above */ 1064 break; 1065 1066 case ENETUNREACH: 1067 case EHOSTUNREACH: 1068 case ENETDOWN: 1069 case EHOSTDOWN: 1070 default: 1071 type = ICMP_UNREACH; 1072 code = ICMP_UNREACH_HOST; 1073 break; 1074 1075 case EMSGSIZE: 1076 type = ICMP_UNREACH; 1077 code = ICMP_UNREACH_NEEDFRAG; 1078 /* 1079 * If the MTU was set before make sure we are below the 1080 * interface MTU. 1081 * If the MTU wasn't set before use the interface mtu or 1082 * fall back to the next smaller mtu step compared to the 1083 * current packet size. 1084 */ 1085 if (mtu != 0) { 1086 if (ia != NULL) 1087 mtu = min(mtu, ia->ia_ifp->if_mtu); 1088 } else { 1089 if (ia != NULL) 1090 mtu = ia->ia_ifp->if_mtu; 1091 else 1092 mtu = ip_next_mtu(ntohs(ip->ip_len), 0); 1093 } 1094 IPSTAT_INC(ips_cantfrag); 1095 break; 1096 1097 case ENOBUFS: 1098 case EACCES: /* ipfw denied packet */ 1099 m_freem(mcopy); 1100 return; 1101 } 1102 icmp_error(mcopy, type, code, dest.s_addr, mtu); 1103 } 1104 1105 #define CHECK_SO_CT(sp, ct) \ 1106 (((sp->so_options & SO_TIMESTAMP) && (sp->so_ts_clock == ct)) ? 1 : 0) 1107 1108 void 1109 ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip, 1110 struct mbuf *m) 1111 { 1112 bool stamped; 1113 1114 stamped = false; 1115 if ((inp->inp_socket->so_options & SO_BINTIME) || 1116 CHECK_SO_CT(inp->inp_socket, SO_TS_BINTIME)) { 1117 struct bintime boottimebin, bt; 1118 struct timespec ts1; 1119 1120 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1121 M_TSTMP)) { 1122 mbuf_tstmp2timespec(m, &ts1); 1123 timespec2bintime(&ts1, &bt); 1124 getboottimebin(&boottimebin); 1125 bintime_add(&bt, &boottimebin); 1126 } else { 1127 bintime(&bt); 1128 } 1129 *mp = sbcreatecontrol(&bt, sizeof(bt), SCM_BINTIME, 1130 SOL_SOCKET, M_NOWAIT); 1131 if (*mp != NULL) { 1132 mp = &(*mp)->m_next; 1133 stamped = true; 1134 } 1135 } 1136 if (CHECK_SO_CT(inp->inp_socket, SO_TS_REALTIME_MICRO)) { 1137 struct bintime boottimebin, bt1; 1138 struct timespec ts1; 1139 struct timeval tv; 1140 1141 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1142 M_TSTMP)) { 1143 mbuf_tstmp2timespec(m, &ts1); 1144 timespec2bintime(&ts1, &bt1); 1145 getboottimebin(&boottimebin); 1146 bintime_add(&bt1, &boottimebin); 1147 bintime2timeval(&bt1, &tv); 1148 } else { 1149 microtime(&tv); 1150 } 1151 *mp = sbcreatecontrol((caddr_t)&tv, sizeof(tv), SCM_TIMESTAMP, 1152 SOL_SOCKET, M_NOWAIT); 1153 if (*mp != NULL) { 1154 mp = &(*mp)->m_next; 1155 stamped = true; 1156 } 1157 } else if (CHECK_SO_CT(inp->inp_socket, SO_TS_REALTIME)) { 1158 struct bintime boottimebin; 1159 struct timespec ts, ts1; 1160 1161 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1162 M_TSTMP)) { 1163 mbuf_tstmp2timespec(m, &ts); 1164 getboottimebin(&boottimebin); 1165 bintime2timespec(&boottimebin, &ts1); 1166 timespecadd(&ts, &ts1, &ts); 1167 } else { 1168 nanotime(&ts); 1169 } 1170 *mp = sbcreatecontrol(&ts, sizeof(ts), SCM_REALTIME, 1171 SOL_SOCKET, M_NOWAIT); 1172 if (*mp != NULL) { 1173 mp = &(*mp)->m_next; 1174 stamped = true; 1175 } 1176 } else if (CHECK_SO_CT(inp->inp_socket, SO_TS_MONOTONIC)) { 1177 struct timespec ts; 1178 1179 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1180 M_TSTMP)) 1181 mbuf_tstmp2timespec(m, &ts); 1182 else 1183 nanouptime(&ts); 1184 *mp = sbcreatecontrol(&ts, sizeof(ts), SCM_MONOTONIC, 1185 SOL_SOCKET, M_NOWAIT); 1186 if (*mp != NULL) { 1187 mp = &(*mp)->m_next; 1188 stamped = true; 1189 } 1190 } 1191 if (stamped && (m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1192 M_TSTMP)) { 1193 struct sock_timestamp_info sti; 1194 1195 bzero(&sti, sizeof(sti)); 1196 sti.st_info_flags = ST_INFO_HW; 1197 if ((m->m_flags & M_TSTMP_HPREC) != 0) 1198 sti.st_info_flags |= ST_INFO_HW_HPREC; 1199 *mp = sbcreatecontrol(&sti, sizeof(sti), SCM_TIME_INFO, 1200 SOL_SOCKET, M_NOWAIT); 1201 if (*mp != NULL) 1202 mp = &(*mp)->m_next; 1203 } 1204 if (inp->inp_flags & INP_RECVDSTADDR) { 1205 *mp = sbcreatecontrol(&ip->ip_dst, sizeof(struct in_addr), 1206 IP_RECVDSTADDR, IPPROTO_IP, M_NOWAIT); 1207 if (*mp) 1208 mp = &(*mp)->m_next; 1209 } 1210 if (inp->inp_flags & INP_RECVTTL) { 1211 *mp = sbcreatecontrol(&ip->ip_ttl, sizeof(u_char), IP_RECVTTL, 1212 IPPROTO_IP, M_NOWAIT); 1213 if (*mp) 1214 mp = &(*mp)->m_next; 1215 } 1216 #ifdef notyet 1217 /* XXX 1218 * Moving these out of udp_input() made them even more broken 1219 * than they already were. 1220 */ 1221 /* options were tossed already */ 1222 if (inp->inp_flags & INP_RECVOPTS) { 1223 *mp = sbcreatecontrol(opts_deleted_above, 1224 sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP, M_NOWAIT); 1225 if (*mp) 1226 mp = &(*mp)->m_next; 1227 } 1228 /* ip_srcroute doesn't do what we want here, need to fix */ 1229 if (inp->inp_flags & INP_RECVRETOPTS) { 1230 *mp = sbcreatecontrol(ip_srcroute(m), sizeof(struct in_addr), 1231 IP_RECVRETOPTS, IPPROTO_IP, M_NOWAIT); 1232 if (*mp) 1233 mp = &(*mp)->m_next; 1234 } 1235 #endif 1236 if (inp->inp_flags & INP_RECVIF) { 1237 struct ifnet *ifp; 1238 struct sdlbuf { 1239 struct sockaddr_dl sdl; 1240 u_char pad[32]; 1241 } sdlbuf; 1242 struct sockaddr_dl *sdp; 1243 struct sockaddr_dl *sdl2 = &sdlbuf.sdl; 1244 1245 if ((ifp = m->m_pkthdr.rcvif)) { 1246 sdp = (struct sockaddr_dl *)ifp->if_addr->ifa_addr; 1247 /* 1248 * Change our mind and don't try copy. 1249 */ 1250 if (sdp->sdl_family != AF_LINK || 1251 sdp->sdl_len > sizeof(sdlbuf)) { 1252 goto makedummy; 1253 } 1254 bcopy(sdp, sdl2, sdp->sdl_len); 1255 } else { 1256 makedummy: 1257 sdl2->sdl_len = 1258 offsetof(struct sockaddr_dl, sdl_data[0]); 1259 sdl2->sdl_family = AF_LINK; 1260 sdl2->sdl_index = 0; 1261 sdl2->sdl_nlen = sdl2->sdl_alen = sdl2->sdl_slen = 0; 1262 } 1263 *mp = sbcreatecontrol(sdl2, sdl2->sdl_len, IP_RECVIF, 1264 IPPROTO_IP, M_NOWAIT); 1265 if (*mp) 1266 mp = &(*mp)->m_next; 1267 } 1268 if (inp->inp_flags & INP_RECVTOS) { 1269 *mp = sbcreatecontrol(&ip->ip_tos, sizeof(u_char), IP_RECVTOS, 1270 IPPROTO_IP, M_NOWAIT); 1271 if (*mp) 1272 mp = &(*mp)->m_next; 1273 } 1274 1275 if (inp->inp_flags2 & INP_RECVFLOWID) { 1276 uint32_t flowid, flow_type; 1277 1278 flowid = m->m_pkthdr.flowid; 1279 flow_type = M_HASHTYPE_GET(m); 1280 1281 /* 1282 * XXX should handle the failure of one or the 1283 * other - don't populate both? 1284 */ 1285 *mp = sbcreatecontrol(&flowid, sizeof(uint32_t), IP_FLOWID, 1286 IPPROTO_IP, M_NOWAIT); 1287 if (*mp) 1288 mp = &(*mp)->m_next; 1289 *mp = sbcreatecontrol(&flow_type, sizeof(uint32_t), 1290 IP_FLOWTYPE, IPPROTO_IP, M_NOWAIT); 1291 if (*mp) 1292 mp = &(*mp)->m_next; 1293 } 1294 1295 #ifdef RSS 1296 if (inp->inp_flags2 & INP_RECVRSSBUCKETID) { 1297 uint32_t flowid, flow_type; 1298 uint32_t rss_bucketid; 1299 1300 flowid = m->m_pkthdr.flowid; 1301 flow_type = M_HASHTYPE_GET(m); 1302 1303 if (rss_hash2bucket(flowid, flow_type, &rss_bucketid) == 0) { 1304 *mp = sbcreatecontrol(&rss_bucketid, sizeof(uint32_t), 1305 IP_RSSBUCKETID, IPPROTO_IP, M_NOWAIT); 1306 if (*mp) 1307 mp = &(*mp)->m_next; 1308 } 1309 } 1310 #endif 1311 } 1312 1313 /* 1314 * XXXRW: Multicast routing code in ip_mroute.c is generally MPSAFE, but the 1315 * ip_rsvp and ip_rsvp_on variables need to be interlocked with rsvp_on 1316 * locking. This code remains in ip_input.c as ip_mroute.c is optionally 1317 * compiled. 1318 */ 1319 VNET_DEFINE_STATIC(int, ip_rsvp_on); 1320 VNET_DEFINE(struct socket *, ip_rsvpd); 1321 1322 #define V_ip_rsvp_on VNET(ip_rsvp_on) 1323 1324 int 1325 ip_rsvp_init(struct socket *so) 1326 { 1327 1328 if (V_ip_rsvpd != NULL) 1329 return EADDRINUSE; 1330 1331 V_ip_rsvpd = so; 1332 /* 1333 * This may seem silly, but we need to be sure we don't over-increment 1334 * the RSVP counter, in case something slips up. 1335 */ 1336 if (!V_ip_rsvp_on) { 1337 V_ip_rsvp_on = 1; 1338 V_rsvp_on++; 1339 } 1340 1341 return 0; 1342 } 1343 1344 int 1345 ip_rsvp_done(void) 1346 { 1347 1348 V_ip_rsvpd = NULL; 1349 /* 1350 * This may seem silly, but we need to be sure we don't over-decrement 1351 * the RSVP counter, in case something slips up. 1352 */ 1353 if (V_ip_rsvp_on) { 1354 V_ip_rsvp_on = 0; 1355 V_rsvp_on--; 1356 } 1357 return 0; 1358 } 1359 1360 int 1361 rsvp_input(struct mbuf **mp, int *offp, int proto) 1362 { 1363 struct mbuf *m; 1364 1365 m = *mp; 1366 *mp = NULL; 1367 1368 if (rsvp_input_p) { /* call the real one if loaded */ 1369 *mp = m; 1370 rsvp_input_p(mp, offp, proto); 1371 return (IPPROTO_DONE); 1372 } 1373 1374 /* Can still get packets with rsvp_on = 0 if there is a local member 1375 * of the group to which the RSVP packet is addressed. But in this 1376 * case we want to throw the packet away. 1377 */ 1378 1379 if (!V_rsvp_on) { 1380 m_freem(m); 1381 return (IPPROTO_DONE); 1382 } 1383 1384 if (V_ip_rsvpd != NULL) { 1385 *mp = m; 1386 rip_input(mp, offp, proto); 1387 return (IPPROTO_DONE); 1388 } 1389 /* Drop the packet */ 1390 m_freem(m); 1391 return (IPPROTO_DONE); 1392 } 1393