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 #include "opt_bootp.h" 36 #include "opt_inet.h" 37 #include "opt_ipstealth.h" 38 #include "opt_ipsec.h" 39 #include "opt_route.h" 40 #include "opt_rss.h" 41 #include "opt_sctp.h" 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/hhook.h> 46 #include <sys/mbuf.h> 47 #include <sys/malloc.h> 48 #include <sys/domain.h> 49 #include <sys/protosw.h> 50 #include <sys/socket.h> 51 #include <sys/time.h> 52 #include <sys/kernel.h> 53 #include <sys/lock.h> 54 #include <sys/rmlock.h> 55 #include <sys/rwlock.h> 56 #include <sys/sdt.h> 57 #include <sys/syslog.h> 58 #include <sys/sysctl.h> 59 60 #include <net/if.h> 61 #include <net/if_types.h> 62 #include <net/if_var.h> 63 #include <net/if_dl.h> 64 #include <net/if_private.h> 65 #include <net/pfil.h> 66 #include <net/route.h> 67 #include <net/route/nhop.h> 68 #include <net/netisr.h> 69 #include <net/rss_config.h> 70 #include <net/vnet.h> 71 72 #include <netinet/in.h> 73 #include <netinet/in_kdtrace.h> 74 #include <netinet/in_systm.h> 75 #include <netinet/in_var.h> 76 #include <netinet/ip.h> 77 #include <netinet/in_fib.h> 78 #include <netinet/in_pcb.h> 79 #include <netinet/ip_var.h> 80 #include <netinet/ip_encap.h> 81 #include <netinet/ip_fw.h> 82 #include <netinet/ip_icmp.h> 83 #include <netinet/igmp_var.h> 84 #include <netinet/ip_options.h> 85 #include <machine/in_cksum.h> 86 #include <netinet/ip_carp.h> 87 #include <netinet/in_rss.h> 88 #ifdef SCTP 89 #include <netinet/sctp_var.h> 90 #endif 91 92 #include <netipsec/ipsec_support.h> 93 94 #include <sys/socketvar.h> 95 96 #include <security/mac/mac_framework.h> 97 98 #ifdef CTASSERT 99 CTASSERT(sizeof(struct ip) == 20); 100 #endif 101 102 /* IP reassembly functions are defined in ip_reass.c. */ 103 extern void ipreass_init(void); 104 extern void ipreass_vnet_init(void); 105 #ifdef VIMAGE 106 extern void ipreass_destroy(void); 107 #endif 108 109 VNET_DEFINE(int, rsvp_on); 110 111 VNET_DEFINE(int, ipforwarding); 112 SYSCTL_INT(_net_inet_ip, IPCTL_FORWARDING, forwarding, CTLFLAG_VNET | CTLFLAG_RW, 113 &VNET_NAME(ipforwarding), 0, 114 "Enable IP forwarding between interfaces"); 115 116 /* 117 * Respond with an ICMP host redirect when we forward a packet out of 118 * the same interface on which it was received. See RFC 792. 119 */ 120 VNET_DEFINE(int, ipsendredirects) = 1; 121 SYSCTL_INT(_net_inet_ip, IPCTL_SENDREDIRECTS, redirect, CTLFLAG_VNET | CTLFLAG_RW, 122 &VNET_NAME(ipsendredirects), 0, 123 "Enable sending IP redirects"); 124 125 VNET_DEFINE_STATIC(bool, ip_strong_es) = false; 126 #define V_ip_strong_es VNET(ip_strong_es) 127 SYSCTL_BOOL(_net_inet_ip, OID_AUTO, rfc1122_strong_es, 128 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip_strong_es), false, 129 "Packet's IP destination address must match address on arrival interface"); 130 131 VNET_DEFINE_STATIC(bool, ip_sav) = true; 132 #define V_ip_sav VNET(ip_sav) 133 SYSCTL_BOOL(_net_inet_ip, OID_AUTO, source_address_validation, 134 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip_sav), true, 135 "Drop incoming packets with source address that is a local address"); 136 137 /* Packet filter hooks */ 138 VNET_DEFINE(pfil_head_t, inet_pfil_head); 139 VNET_DEFINE(pfil_head_t, inet_local_pfil_head); 140 141 static struct netisr_handler ip_nh = { 142 .nh_name = "ip", 143 .nh_handler = ip_input, 144 .nh_proto = NETISR_IP, 145 #ifdef RSS 146 .nh_m2cpuid = rss_soft_m2cpuid_v4, 147 .nh_policy = NETISR_POLICY_CPU, 148 .nh_dispatch = NETISR_DISPATCH_HYBRID, 149 #else 150 .nh_policy = NETISR_POLICY_FLOW, 151 #endif 152 }; 153 154 #ifdef RSS 155 /* 156 * Directly dispatched frames are currently assumed 157 * to have a flowid already calculated. 158 * 159 * It should likely have something that assert it 160 * actually has valid flow details. 161 */ 162 static struct netisr_handler ip_direct_nh = { 163 .nh_name = "ip_direct", 164 .nh_handler = ip_direct_input, 165 .nh_proto = NETISR_IP_DIRECT, 166 .nh_m2cpuid = rss_soft_m2cpuid_v4, 167 .nh_policy = NETISR_POLICY_CPU, 168 .nh_dispatch = NETISR_DISPATCH_HYBRID, 169 }; 170 #endif 171 172 ipproto_input_t *ip_protox[IPPROTO_MAX] = { 173 [0 ... IPPROTO_MAX - 1] = rip_input }; 174 ipproto_ctlinput_t *ip_ctlprotox[IPPROTO_MAX] = { 175 [0 ... IPPROTO_MAX - 1] = rip_ctlinput }; 176 177 VNET_DEFINE(struct in_ifaddrhead, in_ifaddrhead); /* first inet address */ 178 VNET_DEFINE(struct in_ifaddrhashhead *, in_ifaddrhashtbl); /* inet addr hash table */ 179 VNET_DEFINE(u_long, in_ifaddrhmask); /* mask for hash table */ 180 181 /* Make sure it is safe to use hashinit(9) on CK_LIST. */ 182 CTASSERT(sizeof(struct in_ifaddrhashhead) == sizeof(LIST_HEAD(, in_addr))); 183 184 #ifdef IPCTL_DEFMTU 185 SYSCTL_INT(_net_inet_ip, IPCTL_DEFMTU, mtu, CTLFLAG_RW, 186 &ip_mtu, 0, "Default MTU"); 187 #endif 188 189 #ifdef IPSTEALTH 190 VNET_DEFINE(int, ipstealth); 191 SYSCTL_INT(_net_inet_ip, OID_AUTO, stealth, CTLFLAG_VNET | CTLFLAG_RW, 192 &VNET_NAME(ipstealth), 0, 193 "IP stealth mode, no TTL decrementation on forwarding"); 194 #endif 195 196 /* 197 * IP statistics are stored in the "array" of counter(9)s. 198 */ 199 VNET_PCPUSTAT_DEFINE(struct ipstat, ipstat); 200 VNET_PCPUSTAT_SYSINIT(ipstat); 201 SYSCTL_VNET_PCPUSTAT(_net_inet_ip, IPCTL_STATS, stats, struct ipstat, ipstat, 202 "IP statistics (struct ipstat, netinet/ip_var.h)"); 203 204 #ifdef VIMAGE 205 VNET_PCPUSTAT_SYSUNINIT(ipstat); 206 #endif /* VIMAGE */ 207 208 /* 209 * Kernel module interface for updating ipstat. The argument is an index 210 * into ipstat treated as an array. 211 */ 212 void 213 kmod_ipstat_inc(int statnum) 214 { 215 216 counter_u64_add(VNET(ipstat)[statnum], 1); 217 } 218 219 void 220 kmod_ipstat_dec(int statnum) 221 { 222 223 counter_u64_add(VNET(ipstat)[statnum], -1); 224 } 225 226 static int 227 sysctl_netinet_intr_queue_maxlen(SYSCTL_HANDLER_ARGS) 228 { 229 int error, qlimit; 230 231 netisr_getqlimit(&ip_nh, &qlimit); 232 error = sysctl_handle_int(oidp, &qlimit, 0, req); 233 if (error || !req->newptr) 234 return (error); 235 if (qlimit < 1) 236 return (EINVAL); 237 return (netisr_setqlimit(&ip_nh, qlimit)); 238 } 239 SYSCTL_PROC(_net_inet_ip, IPCTL_INTRQMAXLEN, intr_queue_maxlen, 240 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 0, 241 sysctl_netinet_intr_queue_maxlen, "I", 242 "Maximum size of the IP input queue"); 243 244 static int 245 sysctl_netinet_intr_queue_drops(SYSCTL_HANDLER_ARGS) 246 { 247 u_int64_t qdrops_long; 248 int error, qdrops; 249 250 netisr_getqdrops(&ip_nh, &qdrops_long); 251 qdrops = qdrops_long; 252 error = sysctl_handle_int(oidp, &qdrops, 0, req); 253 if (error || !req->newptr) 254 return (error); 255 if (qdrops != 0) 256 return (EINVAL); 257 netisr_clearqdrops(&ip_nh); 258 return (0); 259 } 260 261 SYSCTL_PROC(_net_inet_ip, IPCTL_INTRQDROPS, intr_queue_drops, 262 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 263 0, 0, sysctl_netinet_intr_queue_drops, "I", 264 "Number of packets dropped from the IP input queue"); 265 266 #ifdef RSS 267 static int 268 sysctl_netinet_intr_direct_queue_maxlen(SYSCTL_HANDLER_ARGS) 269 { 270 int error, qlimit; 271 272 netisr_getqlimit(&ip_direct_nh, &qlimit); 273 error = sysctl_handle_int(oidp, &qlimit, 0, req); 274 if (error || !req->newptr) 275 return (error); 276 if (qlimit < 1) 277 return (EINVAL); 278 return (netisr_setqlimit(&ip_direct_nh, qlimit)); 279 } 280 SYSCTL_PROC(_net_inet_ip, IPCTL_INTRDQMAXLEN, intr_direct_queue_maxlen, 281 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 282 0, 0, sysctl_netinet_intr_direct_queue_maxlen, 283 "I", "Maximum size of the IP direct input queue"); 284 285 static int 286 sysctl_netinet_intr_direct_queue_drops(SYSCTL_HANDLER_ARGS) 287 { 288 u_int64_t qdrops_long; 289 int error, qdrops; 290 291 netisr_getqdrops(&ip_direct_nh, &qdrops_long); 292 qdrops = qdrops_long; 293 error = sysctl_handle_int(oidp, &qdrops, 0, req); 294 if (error || !req->newptr) 295 return (error); 296 if (qdrops != 0) 297 return (EINVAL); 298 netisr_clearqdrops(&ip_direct_nh); 299 return (0); 300 } 301 302 SYSCTL_PROC(_net_inet_ip, IPCTL_INTRDQDROPS, intr_direct_queue_drops, 303 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 0, 304 sysctl_netinet_intr_direct_queue_drops, "I", 305 "Number of packets dropped from the IP direct input queue"); 306 #endif /* RSS */ 307 308 /* 309 * IP initialization: fill in IP protocol switch table. 310 * All protocols not implemented in kernel go to raw IP protocol handler. 311 */ 312 static void 313 ip_vnet_init(void *arg __unused) 314 { 315 struct pfil_head_args args; 316 317 CK_STAILQ_INIT(&V_in_ifaddrhead); 318 V_in_ifaddrhashtbl = hashinit(INADDR_NHASH, M_IFADDR, &V_in_ifaddrhmask); 319 320 /* Initialize IP reassembly queue. */ 321 ipreass_vnet_init(); 322 323 /* Initialize packet filter hooks. */ 324 args.pa_version = PFIL_VERSION; 325 args.pa_flags = PFIL_IN | PFIL_OUT; 326 args.pa_type = PFIL_TYPE_IP4; 327 args.pa_headname = PFIL_INET_NAME; 328 V_inet_pfil_head = pfil_head_register(&args); 329 330 args.pa_flags = PFIL_OUT; 331 args.pa_headname = PFIL_INET_LOCAL_NAME; 332 V_inet_local_pfil_head = pfil_head_register(&args); 333 334 if (hhook_head_register(HHOOK_TYPE_IPSEC_IN, AF_INET, 335 &V_ipsec_hhh_in[HHOOK_IPSEC_INET], 336 HHOOK_WAITOK | HHOOK_HEADISINVNET) != 0) 337 printf("%s: WARNING: unable to register input helper hook\n", 338 __func__); 339 if (hhook_head_register(HHOOK_TYPE_IPSEC_OUT, AF_INET, 340 &V_ipsec_hhh_out[HHOOK_IPSEC_INET], 341 HHOOK_WAITOK | HHOOK_HEADISINVNET) != 0) 342 printf("%s: WARNING: unable to register output helper hook\n", 343 __func__); 344 345 #ifdef VIMAGE 346 netisr_register_vnet(&ip_nh); 347 #ifdef RSS 348 netisr_register_vnet(&ip_direct_nh); 349 #endif 350 #endif 351 } 352 VNET_SYSINIT(ip_vnet_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH, 353 ip_vnet_init, NULL); 354 355 static void 356 ip_init(const void *unused __unused) 357 { 358 359 ipreass_init(); 360 361 /* 362 * Register statically compiled protocols, that are unlikely to 363 * ever become dynamic. 364 */ 365 IPPROTO_REGISTER(IPPROTO_ICMP, icmp_input, NULL); 366 IPPROTO_REGISTER(IPPROTO_IGMP, igmp_input, NULL); 367 IPPROTO_REGISTER(IPPROTO_RSVP, rsvp_input, NULL); 368 IPPROTO_REGISTER(IPPROTO_IPV4, encap4_input, NULL); 369 IPPROTO_REGISTER(IPPROTO_MOBILE, encap4_input, NULL); 370 IPPROTO_REGISTER(IPPROTO_ETHERIP, encap4_input, NULL); 371 IPPROTO_REGISTER(IPPROTO_GRE, encap4_input, NULL); 372 IPPROTO_REGISTER(IPPROTO_IPV6, encap4_input, NULL); 373 IPPROTO_REGISTER(IPPROTO_PIM, encap4_input, NULL); 374 #ifdef SCTP /* XXX: has a loadable & static version */ 375 IPPROTO_REGISTER(IPPROTO_SCTP, sctp_input, sctp_ctlinput); 376 #endif 377 378 netisr_register(&ip_nh); 379 #ifdef RSS 380 netisr_register(&ip_direct_nh); 381 #endif 382 } 383 SYSINIT(ip_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, ip_init, NULL); 384 385 #ifdef VIMAGE 386 static void 387 ip_destroy(void *unused __unused) 388 { 389 int error; 390 391 #ifdef RSS 392 netisr_unregister_vnet(&ip_direct_nh); 393 #endif 394 netisr_unregister_vnet(&ip_nh); 395 396 pfil_head_unregister(V_inet_pfil_head); 397 error = hhook_head_deregister(V_ipsec_hhh_in[HHOOK_IPSEC_INET]); 398 if (error != 0) { 399 printf("%s: WARNING: unable to deregister input helper hook " 400 "type HHOOK_TYPE_IPSEC_IN, id HHOOK_IPSEC_INET: " 401 "error %d returned\n", __func__, error); 402 } 403 error = hhook_head_deregister(V_ipsec_hhh_out[HHOOK_IPSEC_INET]); 404 if (error != 0) { 405 printf("%s: WARNING: unable to deregister output helper hook " 406 "type HHOOK_TYPE_IPSEC_OUT, id HHOOK_IPSEC_INET: " 407 "error %d returned\n", __func__, error); 408 } 409 410 /* Remove the IPv4 addresses from all interfaces. */ 411 in_ifscrub_all(); 412 413 /* Make sure the IPv4 routes are gone as well. */ 414 rib_flush_routes_family(AF_INET); 415 416 /* Destroy IP reassembly queue. */ 417 ipreass_destroy(); 418 419 /* Cleanup in_ifaddr hash table; should be empty. */ 420 hashdestroy(V_in_ifaddrhashtbl, M_IFADDR, V_in_ifaddrhmask); 421 } 422 423 VNET_SYSUNINIT(ip, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, ip_destroy, NULL); 424 #endif 425 426 #ifdef RSS 427 /* 428 * IP direct input routine. 429 * 430 * This is called when reinjecting completed fragments where 431 * all of the previous checking and book-keeping has been done. 432 */ 433 void 434 ip_direct_input(struct mbuf *m) 435 { 436 struct ip *ip; 437 int hlen; 438 439 ip = mtod(m, struct ip *); 440 hlen = ip->ip_hl << 2; 441 442 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 443 if (IPSEC_ENABLED(ipv4)) { 444 if (IPSEC_INPUT(ipv4, m, hlen, ip->ip_p) != 0) 445 return; 446 } 447 #endif /* IPSEC */ 448 IPSTAT_INC(ips_delivered); 449 ip_protox[ip->ip_p](&m, &hlen, ip->ip_p); 450 } 451 #endif 452 453 /* 454 * Ip input routine. Checksum and byte swap header. If fragmented 455 * try to reassemble. Process options. Pass to next level. 456 */ 457 void 458 ip_input(struct mbuf *m) 459 { 460 struct ip *ip = NULL; 461 struct in_ifaddr *ia = NULL; 462 struct ifaddr *ifa; 463 struct ifnet *ifp; 464 int hlen = 0; 465 uint16_t sum, ip_len; 466 int dchg = 0; /* dest changed after fw */ 467 struct in_addr odst; /* original dst address */ 468 bool strong_es; 469 470 M_ASSERTPKTHDR(m); 471 NET_EPOCH_ASSERT(); 472 473 if (m->m_flags & M_FASTFWD_OURS) { 474 m->m_flags &= ~M_FASTFWD_OURS; 475 /* Set up some basics that will be used later. */ 476 ip = mtod(m, struct ip *); 477 hlen = ip->ip_hl << 2; 478 ip_len = ntohs(ip->ip_len); 479 goto ours; 480 } 481 482 IPSTAT_INC(ips_total); 483 484 if (__predict_false(m->m_pkthdr.len < sizeof(struct ip))) 485 goto tooshort; 486 487 if (m->m_len < sizeof(struct ip)) { 488 m = m_pullup(m, sizeof(struct ip)); 489 if (__predict_false(m == NULL)) { 490 IPSTAT_INC(ips_toosmall); 491 return; 492 } 493 } 494 ip = mtod(m, struct ip *); 495 496 if (__predict_false(ip->ip_v != IPVERSION)) { 497 IPSTAT_INC(ips_badvers); 498 goto bad; 499 } 500 501 hlen = ip->ip_hl << 2; 502 if (__predict_false(hlen < sizeof(struct ip))) { /* minimum header length */ 503 IPSTAT_INC(ips_badhlen); 504 goto bad; 505 } 506 if (hlen > m->m_len) { 507 m = m_pullup(m, hlen); 508 if (__predict_false(m == NULL)) { 509 IPSTAT_INC(ips_badhlen); 510 return; 511 } 512 ip = mtod(m, struct ip *); 513 } 514 515 IP_PROBE(receive, NULL, NULL, ip, m->m_pkthdr.rcvif, ip, NULL); 516 517 /* IN_LOOPBACK must not appear on the wire - RFC1122 */ 518 ifp = m->m_pkthdr.rcvif; 519 if (IN_LOOPBACK(ntohl(ip->ip_dst.s_addr)) || 520 IN_LOOPBACK(ntohl(ip->ip_src.s_addr))) { 521 if ((ifp->if_flags & IFF_LOOPBACK) == 0) { 522 IPSTAT_INC(ips_badaddr); 523 goto bad; 524 } 525 } 526 /* The unspecified address can appear only as a src address - RFC1122 */ 527 if (__predict_false(ntohl(ip->ip_dst.s_addr) == INADDR_ANY)) { 528 IPSTAT_INC(ips_badaddr); 529 goto bad; 530 } 531 532 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) { 533 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID); 534 } else { 535 if (hlen == sizeof(struct ip)) { 536 sum = in_cksum_hdr(ip); 537 } else { 538 sum = in_cksum(m, hlen); 539 } 540 } 541 if (__predict_false(sum)) { 542 IPSTAT_INC(ips_badsum); 543 goto bad; 544 } 545 546 ip_len = ntohs(ip->ip_len); 547 if (__predict_false(ip_len < hlen)) { 548 IPSTAT_INC(ips_badlen); 549 goto bad; 550 } 551 552 /* 553 * Check that the amount of data in the buffers 554 * is as at least much as the IP header would have us expect. 555 * Trim mbufs if longer than we expect. 556 * Drop packet if shorter than we expect. 557 */ 558 if (__predict_false(m->m_pkthdr.len < ip_len)) { 559 tooshort: 560 IPSTAT_INC(ips_tooshort); 561 goto bad; 562 } 563 if (m->m_pkthdr.len > ip_len) { 564 if (m->m_len == m->m_pkthdr.len) { 565 m->m_len = ip_len; 566 m->m_pkthdr.len = ip_len; 567 } else 568 m_adj(m, ip_len - m->m_pkthdr.len); 569 } 570 571 /* 572 * Try to forward the packet, but if we fail continue. 573 * ip_tryforward() may generate redirects these days. 574 * XXX the logic below falling through to normal processing 575 * if redirects are required should be revisited as well. 576 * ip_tryforward() does inbound and outbound packet firewall 577 * processing. If firewall has decided that destination becomes 578 * our local address, it sets M_FASTFWD_OURS flag. In this 579 * case skip another inbound firewall processing and update 580 * ip pointer. 581 */ 582 if (V_ipforwarding != 0 583 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 584 && (!IPSEC_ENABLED(ipv4) || 585 IPSEC_CAPS(ipv4, m, IPSEC_CAP_OPERABLE) == 0) 586 #endif 587 ) { 588 /* 589 * ip_dooptions() was run so we can ignore the source route (or 590 * any IP options case) case for redirects in ip_tryforward(). 591 */ 592 if ((m = ip_tryforward(m)) == NULL) 593 return; 594 if (m->m_flags & M_FASTFWD_OURS) { 595 m->m_flags &= ~M_FASTFWD_OURS; 596 ip = mtod(m, struct ip *); 597 goto ours; 598 } 599 } 600 601 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 602 /* 603 * Bypass packet filtering for packets previously handled by IPsec. 604 */ 605 if (IPSEC_ENABLED(ipv4) && 606 IPSEC_CAPS(ipv4, m, IPSEC_CAP_BYPASS_FILTER) != 0) 607 goto passin; 608 #endif 609 610 /* 611 * Run through list of hooks for input packets. 612 * 613 * NB: Beware of the destination address changing (e.g. 614 * by NAT rewriting). When this happens, tell 615 * ip_forward to do the right thing. 616 */ 617 618 /* Jump over all PFIL processing if hooks are not active. */ 619 if (!PFIL_HOOKED_IN(V_inet_pfil_head)) 620 goto passin; 621 622 odst = ip->ip_dst; 623 if (pfil_mbuf_in(V_inet_pfil_head, &m, ifp, NULL) != 624 PFIL_PASS) 625 return; 626 if (m == NULL) /* consumed by filter */ 627 return; 628 629 ip = mtod(m, struct ip *); 630 dchg = (odst.s_addr != ip->ip_dst.s_addr); 631 632 if (m->m_flags & M_FASTFWD_OURS) { 633 m->m_flags &= ~M_FASTFWD_OURS; 634 goto ours; 635 } 636 if (m->m_flags & M_IP_NEXTHOP) { 637 if (m_tag_find(m, PACKET_TAG_IPFORWARD, NULL) != NULL) { 638 /* 639 * Directly ship the packet on. This allows 640 * forwarding packets originally destined to us 641 * to some other directly connected host. 642 */ 643 ip_forward(m, 1); 644 return; 645 } 646 } 647 passin: 648 649 /* 650 * Process options and, if not destined for us, 651 * ship it on. ip_dooptions returns 1 when an 652 * error was detected (causing an icmp message 653 * to be sent and the original packet to be freed). 654 */ 655 if (hlen > sizeof (struct ip) && ip_dooptions(m, 0)) 656 return; 657 658 /* greedy RSVP, snatches any PATH packet of the RSVP protocol and no 659 * matter if it is destined to another node, or whether it is 660 * a multicast one, RSVP wants it! and prevents it from being forwarded 661 * anywhere else. Also checks if the rsvp daemon is running before 662 * grabbing the packet. 663 */ 664 if (ip->ip_p == IPPROTO_RSVP && V_rsvp_on) 665 goto ours; 666 667 /* 668 * Check our list of addresses, to see if the packet is for us. 669 * If we don't have any addresses, assume any unicast packet 670 * we receive might be for us (and let the upper layers deal 671 * with it). 672 */ 673 if (CK_STAILQ_EMPTY(&V_in_ifaddrhead) && 674 (m->m_flags & (M_MCAST|M_BCAST)) == 0) 675 goto ours; 676 677 /* 678 * Enable a consistency check between the destination address 679 * and the arrival interface for a unicast packet (the RFC 1122 680 * strong ES model) with a list of additional predicates: 681 * - if IP forwarding is disabled 682 * - the packet is not locally generated 683 * - the packet is not subject to 'ipfw fwd' 684 * - Interface is not running CARP. If the packet got here, we already 685 * checked it with carp_iamatch() and carp_forus(). 686 */ 687 strong_es = V_ip_strong_es && (V_ipforwarding == 0) && 688 ((ifp->if_flags & IFF_LOOPBACK) == 0) && 689 ifp->if_carp == NULL && (dchg == 0); 690 691 /* 692 * Check for exact addresses in the hash bucket. 693 */ 694 CK_LIST_FOREACH(ia, INADDR_HASH(ip->ip_dst.s_addr), ia_hash) { 695 if (IA_SIN(ia)->sin_addr.s_addr != ip->ip_dst.s_addr) 696 continue; 697 698 /* 699 * net.inet.ip.rfc1122_strong_es: the address matches, verify 700 * that the packet arrived via the correct interface. 701 */ 702 if (__predict_false(strong_es && ia->ia_ifp != ifp)) { 703 IPSTAT_INC(ips_badaddr); 704 goto bad; 705 } 706 707 /* 708 * net.inet.ip.source_address_validation: drop incoming 709 * packets that pretend to be ours. 710 */ 711 if (V_ip_sav && !(ifp->if_flags & IFF_LOOPBACK) && 712 __predict_false(in_localip_fib(ip->ip_src, ifp->if_fib))) { 713 IPSTAT_INC(ips_badaddr); 714 goto bad; 715 } 716 717 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1); 718 counter_u64_add(ia->ia_ifa.ifa_ibytes, m->m_pkthdr.len); 719 goto ours; 720 } 721 722 /* 723 * Check for broadcast addresses. 724 * 725 * Only accept broadcast packets that arrive via the matching 726 * interface. Reception of forwarded directed broadcasts would 727 * be handled via ip_forward() and ether_output() with the loopback 728 * into the stack for SIMPLEX interfaces handled by ether_output(). 729 */ 730 if (ifp->if_flags & IFF_BROADCAST) { 731 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 732 if (ifa->ifa_addr->sa_family != AF_INET) 733 continue; 734 ia = ifatoia(ifa); 735 if (satosin(&ia->ia_broadaddr)->sin_addr.s_addr == 736 ip->ip_dst.s_addr) { 737 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1); 738 counter_u64_add(ia->ia_ifa.ifa_ibytes, 739 m->m_pkthdr.len); 740 goto ours; 741 } 742 #ifdef BOOTP_COMPAT 743 if (IA_SIN(ia)->sin_addr.s_addr == INADDR_ANY) { 744 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1); 745 counter_u64_add(ia->ia_ifa.ifa_ibytes, 746 m->m_pkthdr.len); 747 goto ours; 748 } 749 #endif 750 } 751 ia = NULL; 752 } 753 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 754 /* 755 * RFC 3927 2.7: Do not forward multicast packets from 756 * IN_LINKLOCAL. 757 */ 758 if (V_ip_mrouter && !IN_LINKLOCAL(ntohl(ip->ip_src.s_addr))) { 759 /* 760 * If we are acting as a multicast router, all 761 * incoming multicast packets are passed to the 762 * kernel-level multicast forwarding function. 763 * The packet is returned (relatively) intact; if 764 * ip_mforward() returns a non-zero value, the packet 765 * must be discarded, else it may be accepted below. 766 */ 767 if (ip_mforward && ip_mforward(ip, ifp, m, 0) != 0) { 768 IPSTAT_INC(ips_cantforward); 769 m_freem(m); 770 return; 771 } 772 773 /* 774 * The process-level routing daemon needs to receive 775 * all multicast IGMP packets, whether or not this 776 * host belongs to their destination groups. 777 */ 778 if (ip->ip_p == IPPROTO_IGMP) { 779 goto ours; 780 } 781 IPSTAT_INC(ips_forward); 782 } 783 /* 784 * Assume the packet is for us, to avoid prematurely taking 785 * a lock on the in_multi hash. Protocols must perform 786 * their own filtering and update statistics accordingly. 787 */ 788 goto ours; 789 } 790 if (ip->ip_dst.s_addr == (u_long)INADDR_BROADCAST) 791 goto ours; 792 if (ip->ip_dst.s_addr == INADDR_ANY) 793 goto ours; 794 /* RFC 3927 2.7: Do not forward packets to or from IN_LINKLOCAL. */ 795 if (IN_LINKLOCAL(ntohl(ip->ip_dst.s_addr)) || 796 IN_LINKLOCAL(ntohl(ip->ip_src.s_addr))) { 797 IPSTAT_INC(ips_cantforward); 798 m_freem(m); 799 return; 800 } 801 802 /* 803 * Not for us; forward if possible and desirable. 804 */ 805 if (V_ipforwarding == 0) { 806 IPSTAT_INC(ips_cantforward); 807 m_freem(m); 808 } else { 809 ip_forward(m, dchg); 810 } 811 return; 812 813 ours: 814 #ifdef IPSTEALTH 815 /* 816 * IPSTEALTH: Process non-routing options only 817 * if the packet is destined for us. 818 */ 819 if (V_ipstealth && hlen > sizeof (struct ip) && ip_dooptions(m, 1)) 820 return; 821 #endif /* IPSTEALTH */ 822 823 /* 824 * We are going to ship the packet to the local protocol stack. Call the 825 * filter again for this 'output' action, allowing redirect-like rules 826 * to adjust the source address. 827 */ 828 if (PFIL_HOOKED_OUT(V_inet_local_pfil_head)) { 829 if (pfil_mbuf_out(V_inet_local_pfil_head, &m, V_loif, NULL) != 830 PFIL_PASS) 831 return; 832 if (m == NULL) /* consumed by filter */ 833 return; 834 ip = mtod(m, struct ip *); 835 } 836 837 /* 838 * Attempt reassembly; if it succeeds, proceed. 839 * ip_reass() will return a different mbuf. 840 */ 841 if (ip->ip_off & htons(IP_MF | IP_OFFMASK)) { 842 /* XXXGL: shouldn't we save & set m_flags? */ 843 m = ip_reass(m); 844 if (m == NULL) 845 return; 846 ip = mtod(m, struct ip *); 847 /* Get the header length of the reassembled packet */ 848 hlen = ip->ip_hl << 2; 849 } 850 851 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 852 if (IPSEC_ENABLED(ipv4)) { 853 if (IPSEC_INPUT(ipv4, m, hlen, ip->ip_p) != 0) 854 return; 855 } 856 #endif /* IPSEC */ 857 858 /* 859 * Switch out to protocol's input routine. 860 */ 861 IPSTAT_INC(ips_delivered); 862 863 ip_protox[ip->ip_p](&m, &hlen, ip->ip_p); 864 return; 865 bad: 866 m_freem(m); 867 } 868 869 int 870 ipproto_register(uint8_t proto, ipproto_input_t input, ipproto_ctlinput_t ctl) 871 { 872 873 MPASS(proto > 0); 874 875 /* 876 * The protocol slot must not be occupied by another protocol 877 * already. An index pointing to rip_input() is unused. 878 */ 879 if (ip_protox[proto] == rip_input) { 880 ip_protox[proto] = input; 881 ip_ctlprotox[proto] = ctl; 882 return (0); 883 } else 884 return (EEXIST); 885 } 886 887 int 888 ipproto_unregister(uint8_t proto) 889 { 890 891 MPASS(proto > 0); 892 893 if (ip_protox[proto] != rip_input) { 894 ip_protox[proto] = rip_input; 895 ip_ctlprotox[proto] = rip_ctlinput; 896 return (0); 897 } else 898 return (ENOENT); 899 } 900 901 /* 902 * Forward a packet. If some error occurs return the sender 903 * an icmp packet. Note we can't always generate a meaningful 904 * icmp message because icmp doesn't have a large enough repertoire 905 * of codes and types. 906 * 907 * If not forwarding, just drop the packet. This could be confusing 908 * if ipforwarding was zero but some routing protocol was advancing 909 * us as a gateway to somewhere. However, we must let the routing 910 * protocol deal with that. 911 * 912 * The srcrt parameter indicates whether the packet is being forwarded 913 * via a source route. 914 */ 915 void 916 ip_forward(struct mbuf *m, int srcrt) 917 { 918 struct ip *ip = mtod(m, struct ip *); 919 struct in_ifaddr *ia; 920 struct mbuf *mcopy; 921 struct sockaddr_in *sin; 922 struct in_addr dest; 923 struct route ro; 924 uint32_t flowid; 925 int error, type = 0, code = 0, mtu = 0; 926 927 NET_EPOCH_ASSERT(); 928 929 if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) { 930 IPSTAT_INC(ips_cantforward); 931 m_freem(m); 932 return; 933 } 934 if ( 935 #ifdef IPSTEALTH 936 V_ipstealth == 0 && 937 #endif 938 ip->ip_ttl <= IPTTLDEC) { 939 icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, 0, 0); 940 return; 941 } 942 943 bzero(&ro, sizeof(ro)); 944 sin = (struct sockaddr_in *)&ro.ro_dst; 945 sin->sin_family = AF_INET; 946 sin->sin_len = sizeof(*sin); 947 sin->sin_addr = ip->ip_dst; 948 flowid = m->m_pkthdr.flowid; 949 ro.ro_nh = fib4_lookup(M_GETFIB(m), ip->ip_dst, 0, NHR_REF, flowid); 950 if (ro.ro_nh != NULL) { 951 ia = ifatoia(ro.ro_nh->nh_ifa); 952 } else 953 ia = NULL; 954 /* 955 * Save the IP header and at most 8 bytes of the payload, 956 * in case we need to generate an ICMP message to the src. 957 * 958 * XXX this can be optimized a lot by saving the data in a local 959 * buffer on the stack (72 bytes at most), and only allocating the 960 * mbuf if really necessary. The vast majority of the packets 961 * are forwarded without having to send an ICMP back (either 962 * because unnecessary, or because rate limited), so we are 963 * really we are wasting a lot of work here. 964 * 965 * We don't use m_copym() because it might return a reference 966 * to a shared cluster. Both this function and ip_output() 967 * assume exclusive access to the IP header in `m', so any 968 * data in a cluster may change before we reach icmp_error(). 969 */ 970 mcopy = m_gethdr(M_NOWAIT, m->m_type); 971 if (mcopy != NULL && !m_dup_pkthdr(mcopy, m, M_NOWAIT)) { 972 /* 973 * It's probably ok if the pkthdr dup fails (because 974 * the deep copy of the tag chain failed), but for now 975 * be conservative and just discard the copy since 976 * code below may some day want the tags. 977 */ 978 m_free(mcopy); 979 mcopy = NULL; 980 } 981 if (mcopy != NULL) { 982 mcopy->m_len = min(ntohs(ip->ip_len), M_TRAILINGSPACE(mcopy)); 983 mcopy->m_pkthdr.len = mcopy->m_len; 984 m_copydata(m, 0, mcopy->m_len, mtod(mcopy, caddr_t)); 985 } 986 #ifdef IPSTEALTH 987 if (V_ipstealth == 0) 988 #endif 989 ip->ip_ttl -= IPTTLDEC; 990 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 991 if (IPSEC_ENABLED(ipv4)) { 992 if ((error = IPSEC_FORWARD(ipv4, m)) != 0) { 993 /* mbuf consumed by IPsec */ 994 RO_NHFREE(&ro); 995 m_freem(mcopy); 996 if (error != EINPROGRESS) 997 IPSTAT_INC(ips_cantforward); 998 return; 999 } 1000 /* No IPsec processing required */ 1001 } 1002 #endif /* IPSEC */ 1003 /* 1004 * If forwarding packet using same interface that it came in on, 1005 * perhaps should send a redirect to sender to shortcut a hop. 1006 * Only send redirect if source is sending directly to us, 1007 * and if packet was not source routed (or has any options). 1008 * Also, don't send redirect if forwarding using a default route 1009 * or a route modified by a redirect. 1010 */ 1011 dest.s_addr = 0; 1012 if (!srcrt && V_ipsendredirects && 1013 ia != NULL && ia->ia_ifp == m->m_pkthdr.rcvif) { 1014 struct nhop_object *nh; 1015 1016 nh = ro.ro_nh; 1017 1018 if (nh != NULL && ((nh->nh_flags & (NHF_REDIRECT|NHF_DEFAULT)) == 0)) { 1019 struct in_ifaddr *nh_ia = (struct in_ifaddr *)(nh->nh_ifa); 1020 u_long src = ntohl(ip->ip_src.s_addr); 1021 1022 if (nh_ia != NULL && 1023 (src & nh_ia->ia_subnetmask) == nh_ia->ia_subnet) { 1024 /* Router requirements says to only send host redirects */ 1025 type = ICMP_REDIRECT; 1026 code = ICMP_REDIRECT_HOST; 1027 if (nh->nh_flags & NHF_GATEWAY) { 1028 if (nh->gw_sa.sa_family == AF_INET) 1029 dest.s_addr = nh->gw4_sa.sin_addr.s_addr; 1030 else /* Do not redirect in case gw is AF_INET6 */ 1031 type = 0; 1032 } else 1033 dest.s_addr = ip->ip_dst.s_addr; 1034 } 1035 } 1036 } 1037 1038 error = ip_output(m, NULL, &ro, IP_FORWARDING, NULL, NULL); 1039 1040 if (error == EMSGSIZE && ro.ro_nh) 1041 mtu = ro.ro_nh->nh_mtu; 1042 RO_NHFREE(&ro); 1043 1044 if (error) 1045 IPSTAT_INC(ips_cantforward); 1046 else { 1047 IPSTAT_INC(ips_forward); 1048 if (type) 1049 IPSTAT_INC(ips_redirectsent); 1050 else { 1051 if (mcopy) 1052 m_freem(mcopy); 1053 return; 1054 } 1055 } 1056 if (mcopy == NULL) 1057 return; 1058 1059 switch (error) { 1060 case 0: /* forwarded, but need redirect */ 1061 /* type, code set above */ 1062 break; 1063 1064 case ENETUNREACH: 1065 case EHOSTUNREACH: 1066 case ENETDOWN: 1067 case EHOSTDOWN: 1068 default: 1069 type = ICMP_UNREACH; 1070 code = ICMP_UNREACH_HOST; 1071 break; 1072 1073 case EMSGSIZE: 1074 type = ICMP_UNREACH; 1075 code = ICMP_UNREACH_NEEDFRAG; 1076 /* 1077 * If the MTU was set before make sure we are below the 1078 * interface MTU. 1079 * If the MTU wasn't set before use the interface mtu or 1080 * fall back to the next smaller mtu step compared to the 1081 * current packet size. 1082 */ 1083 if (mtu != 0) { 1084 if (ia != NULL) 1085 mtu = min(mtu, ia->ia_ifp->if_mtu); 1086 } else { 1087 if (ia != NULL) 1088 mtu = ia->ia_ifp->if_mtu; 1089 else 1090 mtu = ip_next_mtu(ntohs(ip->ip_len), 0); 1091 } 1092 IPSTAT_INC(ips_cantfrag); 1093 break; 1094 1095 case ENOBUFS: 1096 case EACCES: /* ipfw denied packet */ 1097 m_freem(mcopy); 1098 return; 1099 } 1100 icmp_error(mcopy, type, code, dest.s_addr, mtu); 1101 } 1102 1103 #define CHECK_SO_CT(sp, ct) \ 1104 (((sp->so_options & SO_TIMESTAMP) && (sp->so_ts_clock == ct)) ? 1 : 0) 1105 1106 void 1107 ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip, 1108 struct mbuf *m) 1109 { 1110 bool stamped; 1111 1112 stamped = false; 1113 if ((inp->inp_socket->so_options & SO_BINTIME) || 1114 CHECK_SO_CT(inp->inp_socket, SO_TS_BINTIME)) { 1115 struct bintime boottimebin, bt; 1116 struct timespec ts1; 1117 1118 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1119 M_TSTMP)) { 1120 mbuf_tstmp2timespec(m, &ts1); 1121 timespec2bintime(&ts1, &bt); 1122 getboottimebin(&boottimebin); 1123 bintime_add(&bt, &boottimebin); 1124 } else { 1125 bintime(&bt); 1126 } 1127 *mp = sbcreatecontrol(&bt, sizeof(bt), SCM_BINTIME, 1128 SOL_SOCKET, M_NOWAIT); 1129 if (*mp != NULL) { 1130 mp = &(*mp)->m_next; 1131 stamped = true; 1132 } 1133 } 1134 if (CHECK_SO_CT(inp->inp_socket, SO_TS_REALTIME_MICRO)) { 1135 struct bintime boottimebin, bt1; 1136 struct timespec ts1; 1137 struct timeval tv; 1138 1139 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1140 M_TSTMP)) { 1141 mbuf_tstmp2timespec(m, &ts1); 1142 timespec2bintime(&ts1, &bt1); 1143 getboottimebin(&boottimebin); 1144 bintime_add(&bt1, &boottimebin); 1145 bintime2timeval(&bt1, &tv); 1146 } else { 1147 microtime(&tv); 1148 } 1149 *mp = sbcreatecontrol((caddr_t)&tv, sizeof(tv), SCM_TIMESTAMP, 1150 SOL_SOCKET, M_NOWAIT); 1151 if (*mp != NULL) { 1152 mp = &(*mp)->m_next; 1153 stamped = true; 1154 } 1155 } else if (CHECK_SO_CT(inp->inp_socket, SO_TS_REALTIME)) { 1156 struct bintime boottimebin; 1157 struct timespec ts, ts1; 1158 1159 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1160 M_TSTMP)) { 1161 mbuf_tstmp2timespec(m, &ts); 1162 getboottimebin(&boottimebin); 1163 bintime2timespec(&boottimebin, &ts1); 1164 timespecadd(&ts, &ts1, &ts); 1165 } else { 1166 nanotime(&ts); 1167 } 1168 *mp = sbcreatecontrol(&ts, sizeof(ts), SCM_REALTIME, 1169 SOL_SOCKET, M_NOWAIT); 1170 if (*mp != NULL) { 1171 mp = &(*mp)->m_next; 1172 stamped = true; 1173 } 1174 } else if (CHECK_SO_CT(inp->inp_socket, SO_TS_MONOTONIC)) { 1175 struct timespec ts; 1176 1177 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1178 M_TSTMP)) 1179 mbuf_tstmp2timespec(m, &ts); 1180 else 1181 nanouptime(&ts); 1182 *mp = sbcreatecontrol(&ts, sizeof(ts), SCM_MONOTONIC, 1183 SOL_SOCKET, M_NOWAIT); 1184 if (*mp != NULL) { 1185 mp = &(*mp)->m_next; 1186 stamped = true; 1187 } 1188 } 1189 if (stamped && (m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1190 M_TSTMP)) { 1191 struct sock_timestamp_info sti; 1192 1193 bzero(&sti, sizeof(sti)); 1194 sti.st_info_flags = ST_INFO_HW; 1195 if ((m->m_flags & M_TSTMP_HPREC) != 0) 1196 sti.st_info_flags |= ST_INFO_HW_HPREC; 1197 *mp = sbcreatecontrol(&sti, sizeof(sti), SCM_TIME_INFO, 1198 SOL_SOCKET, M_NOWAIT); 1199 if (*mp != NULL) 1200 mp = &(*mp)->m_next; 1201 } 1202 if (inp->inp_flags & INP_RECVDSTADDR) { 1203 *mp = sbcreatecontrol(&ip->ip_dst, sizeof(struct in_addr), 1204 IP_RECVDSTADDR, IPPROTO_IP, M_NOWAIT); 1205 if (*mp) 1206 mp = &(*mp)->m_next; 1207 } 1208 if (inp->inp_flags & INP_RECVTTL) { 1209 *mp = sbcreatecontrol(&ip->ip_ttl, sizeof(u_char), IP_RECVTTL, 1210 IPPROTO_IP, M_NOWAIT); 1211 if (*mp) 1212 mp = &(*mp)->m_next; 1213 } 1214 #ifdef notyet 1215 /* XXX 1216 * Moving these out of udp_input() made them even more broken 1217 * than they already were. 1218 */ 1219 /* options were tossed already */ 1220 if (inp->inp_flags & INP_RECVOPTS) { 1221 *mp = sbcreatecontrol(opts_deleted_above, 1222 sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP, M_NOWAIT); 1223 if (*mp) 1224 mp = &(*mp)->m_next; 1225 } 1226 /* ip_srcroute doesn't do what we want here, need to fix */ 1227 if (inp->inp_flags & INP_RECVRETOPTS) { 1228 *mp = sbcreatecontrol(ip_srcroute(m), sizeof(struct in_addr), 1229 IP_RECVRETOPTS, IPPROTO_IP, M_NOWAIT); 1230 if (*mp) 1231 mp = &(*mp)->m_next; 1232 } 1233 #endif 1234 if (inp->inp_flags & INP_RECVIF) { 1235 struct ifnet *ifp; 1236 struct sdlbuf { 1237 struct sockaddr_dl sdl; 1238 u_char pad[32]; 1239 } sdlbuf; 1240 struct sockaddr_dl *sdp; 1241 struct sockaddr_dl *sdl2 = &sdlbuf.sdl; 1242 1243 if ((ifp = m->m_pkthdr.rcvif)) { 1244 sdp = (struct sockaddr_dl *)ifp->if_addr->ifa_addr; 1245 /* 1246 * Change our mind and don't try copy. 1247 */ 1248 if (sdp->sdl_family != AF_LINK || 1249 sdp->sdl_len > sizeof(sdlbuf)) { 1250 goto makedummy; 1251 } 1252 bcopy(sdp, sdl2, sdp->sdl_len); 1253 } else { 1254 makedummy: 1255 sdl2->sdl_len = 1256 offsetof(struct sockaddr_dl, sdl_data[0]); 1257 sdl2->sdl_family = AF_LINK; 1258 sdl2->sdl_index = 0; 1259 sdl2->sdl_nlen = sdl2->sdl_alen = sdl2->sdl_slen = 0; 1260 } 1261 *mp = sbcreatecontrol(sdl2, sdl2->sdl_len, IP_RECVIF, 1262 IPPROTO_IP, M_NOWAIT); 1263 if (*mp) 1264 mp = &(*mp)->m_next; 1265 } 1266 if (inp->inp_flags & INP_RECVTOS) { 1267 *mp = sbcreatecontrol(&ip->ip_tos, sizeof(u_char), IP_RECVTOS, 1268 IPPROTO_IP, M_NOWAIT); 1269 if (*mp) 1270 mp = &(*mp)->m_next; 1271 } 1272 1273 if (inp->inp_flags2 & INP_RECVFLOWID) { 1274 uint32_t flowid, flow_type; 1275 1276 flowid = m->m_pkthdr.flowid; 1277 flow_type = M_HASHTYPE_GET(m); 1278 1279 /* 1280 * XXX should handle the failure of one or the 1281 * other - don't populate both? 1282 */ 1283 *mp = sbcreatecontrol(&flowid, sizeof(uint32_t), IP_FLOWID, 1284 IPPROTO_IP, M_NOWAIT); 1285 if (*mp) 1286 mp = &(*mp)->m_next; 1287 *mp = sbcreatecontrol(&flow_type, sizeof(uint32_t), 1288 IP_FLOWTYPE, IPPROTO_IP, M_NOWAIT); 1289 if (*mp) 1290 mp = &(*mp)->m_next; 1291 } 1292 1293 #ifdef RSS 1294 if (inp->inp_flags2 & INP_RECVRSSBUCKETID) { 1295 uint32_t flowid, flow_type; 1296 uint32_t rss_bucketid; 1297 1298 flowid = m->m_pkthdr.flowid; 1299 flow_type = M_HASHTYPE_GET(m); 1300 1301 if (rss_hash2bucket(flowid, flow_type, &rss_bucketid) == 0) { 1302 *mp = sbcreatecontrol(&rss_bucketid, sizeof(uint32_t), 1303 IP_RSSBUCKETID, IPPROTO_IP, M_NOWAIT); 1304 if (*mp) 1305 mp = &(*mp)->m_next; 1306 } 1307 } 1308 #endif 1309 } 1310 1311 /* 1312 * XXXRW: Multicast routing code in ip_mroute.c is generally MPSAFE, but the 1313 * ip_rsvp and ip_rsvp_on variables need to be interlocked with rsvp_on 1314 * locking. This code remains in ip_input.c as ip_mroute.c is optionally 1315 * compiled. 1316 */ 1317 VNET_DEFINE_STATIC(int, ip_rsvp_on); 1318 VNET_DEFINE(struct socket *, ip_rsvpd); 1319 1320 #define V_ip_rsvp_on VNET(ip_rsvp_on) 1321 1322 int 1323 ip_rsvp_init(struct socket *so) 1324 { 1325 1326 if (V_ip_rsvpd != NULL) 1327 return EADDRINUSE; 1328 1329 V_ip_rsvpd = so; 1330 /* 1331 * This may seem silly, but we need to be sure we don't over-increment 1332 * the RSVP counter, in case something slips up. 1333 */ 1334 if (!V_ip_rsvp_on) { 1335 V_ip_rsvp_on = 1; 1336 V_rsvp_on++; 1337 } 1338 1339 return 0; 1340 } 1341 1342 int 1343 ip_rsvp_done(void) 1344 { 1345 1346 V_ip_rsvpd = NULL; 1347 /* 1348 * This may seem silly, but we need to be sure we don't over-decrement 1349 * the RSVP counter, in case something slips up. 1350 */ 1351 if (V_ip_rsvp_on) { 1352 V_ip_rsvp_on = 0; 1353 V_rsvp_on--; 1354 } 1355 return 0; 1356 } 1357 1358 int 1359 rsvp_input(struct mbuf **mp, int *offp, int proto) 1360 { 1361 struct mbuf *m; 1362 1363 m = *mp; 1364 *mp = NULL; 1365 1366 if (rsvp_input_p) { /* call the real one if loaded */ 1367 *mp = m; 1368 rsvp_input_p(mp, offp, proto); 1369 return (IPPROTO_DONE); 1370 } 1371 1372 /* Can still get packets with rsvp_on = 0 if there is a local member 1373 * of the group to which the RSVP packet is addressed. But in this 1374 * case we want to throw the packet away. 1375 */ 1376 1377 if (!V_rsvp_on) { 1378 m_freem(m); 1379 return (IPPROTO_DONE); 1380 } 1381 1382 if (V_ip_rsvpd != NULL) { 1383 *mp = m; 1384 rip_input(mp, offp, proto); 1385 return (IPPROTO_DONE); 1386 } 1387 /* Drop the packet */ 1388 m_freem(m); 1389 return (IPPROTO_DONE); 1390 } 1391