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 32 #include <sys/cdefs.h> 33 #include "opt_bootp.h" 34 #include "opt_inet.h" 35 #include "opt_ipstealth.h" 36 #include "opt_ipsec.h" 37 #include "opt_route.h" 38 #include "opt_rss.h" 39 #include "opt_sctp.h" 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/hhook.h> 44 #include <sys/mbuf.h> 45 #include <sys/malloc.h> 46 #include <sys/domain.h> 47 #include <sys/protosw.h> 48 #include <sys/socket.h> 49 #include <sys/time.h> 50 #include <sys/kernel.h> 51 #include <sys/lock.h> 52 #include <sys/rmlock.h> 53 #include <sys/rwlock.h> 54 #include <sys/sdt.h> 55 #include <sys/syslog.h> 56 #include <sys/sysctl.h> 57 58 #include <net/if.h> 59 #include <net/if_types.h> 60 #include <net/if_var.h> 61 #include <net/if_dl.h> 62 #include <net/if_private.h> 63 #include <net/pfil.h> 64 #include <net/route.h> 65 #include <net/route/nhop.h> 66 #include <net/netisr.h> 67 #include <net/rss_config.h> 68 #include <net/vnet.h> 69 70 #include <netinet/in.h> 71 #include <netinet/in_kdtrace.h> 72 #include <netinet/in_systm.h> 73 #include <netinet/in_var.h> 74 #include <netinet/ip.h> 75 #include <netinet/in_fib.h> 76 #include <netinet/in_pcb.h> 77 #include <netinet/ip_var.h> 78 #include <netinet/ip_encap.h> 79 #include <netinet/ip_fw.h> 80 #include <netinet/ip_icmp.h> 81 #include <netinet/igmp_var.h> 82 #include <netinet/ip_options.h> 83 #include <machine/in_cksum.h> 84 #include <netinet/ip_carp.h> 85 #include <netinet/in_rss.h> 86 #ifdef SCTP 87 #include <netinet/sctp_var.h> 88 #endif 89 90 #include <netipsec/ipsec_support.h> 91 92 #include <sys/socketvar.h> 93 94 #include <security/mac/mac_framework.h> 95 96 #ifdef CTASSERT 97 CTASSERT(sizeof(struct ip) == 20); 98 #endif 99 100 /* IP reassembly functions are defined in ip_reass.c. */ 101 extern void ipreass_init(void); 102 extern void ipreass_vnet_init(void); 103 #ifdef VIMAGE 104 extern void ipreass_destroy(void); 105 #endif 106 107 VNET_DEFINE(int, rsvp_on); 108 109 VNET_DEFINE(int, ipforwarding); 110 SYSCTL_INT(_net_inet_ip, IPCTL_FORWARDING, forwarding, CTLFLAG_VNET | CTLFLAG_RW, 111 &VNET_NAME(ipforwarding), 0, 112 "Enable IP forwarding between interfaces"); 113 114 /* 115 * Respond with an ICMP host redirect when we forward a packet out of 116 * the same interface on which it was received. See RFC 792. 117 */ 118 VNET_DEFINE(int, ipsendredirects) = 1; 119 SYSCTL_INT(_net_inet_ip, IPCTL_SENDREDIRECTS, redirect, CTLFLAG_VNET | CTLFLAG_RW, 120 &VNET_NAME(ipsendredirects), 0, 121 "Enable sending IP redirects"); 122 123 VNET_DEFINE_STATIC(bool, ip_strong_es) = false; 124 #define V_ip_strong_es VNET(ip_strong_es) 125 SYSCTL_BOOL(_net_inet_ip, OID_AUTO, rfc1122_strong_es, 126 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip_strong_es), false, 127 "Packet's IP destination address must match address on arrival interface"); 128 129 VNET_DEFINE_STATIC(bool, ip_sav) = true; 130 #define V_ip_sav VNET(ip_sav) 131 SYSCTL_BOOL(_net_inet_ip, OID_AUTO, source_address_validation, 132 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip_sav), true, 133 "Drop incoming packets with source address that is a local address"); 134 135 /* Packet filter hooks */ 136 VNET_DEFINE(pfil_head_t, inet_pfil_head); 137 VNET_DEFINE(pfil_head_t, inet_local_pfil_head); 138 139 static struct netisr_handler ip_nh = { 140 .nh_name = "ip", 141 .nh_handler = ip_input, 142 .nh_proto = NETISR_IP, 143 #ifdef RSS 144 .nh_m2cpuid = rss_soft_m2cpuid_v4, 145 .nh_policy = NETISR_POLICY_CPU, 146 .nh_dispatch = NETISR_DISPATCH_HYBRID, 147 #else 148 .nh_policy = NETISR_POLICY_FLOW, 149 #endif 150 }; 151 152 #ifdef RSS 153 /* 154 * Directly dispatched frames are currently assumed 155 * to have a flowid already calculated. 156 * 157 * It should likely have something that assert it 158 * actually has valid flow details. 159 */ 160 static struct netisr_handler ip_direct_nh = { 161 .nh_name = "ip_direct", 162 .nh_handler = ip_direct_input, 163 .nh_proto = NETISR_IP_DIRECT, 164 .nh_m2cpuid = rss_soft_m2cpuid_v4, 165 .nh_policy = NETISR_POLICY_CPU, 166 .nh_dispatch = NETISR_DISPATCH_HYBRID, 167 }; 168 #endif 169 170 ipproto_input_t *ip_protox[IPPROTO_MAX] = { 171 [0 ... IPPROTO_MAX - 1] = rip_input }; 172 ipproto_ctlinput_t *ip_ctlprotox[IPPROTO_MAX] = { 173 [0 ... IPPROTO_MAX - 1] = rip_ctlinput }; 174 175 VNET_DEFINE(struct in_ifaddrhead, in_ifaddrhead); /* first inet address */ 176 VNET_DEFINE(struct in_ifaddrhashhead *, in_ifaddrhashtbl); /* inet addr hash table */ 177 VNET_DEFINE(u_long, in_ifaddrhmask); /* mask for hash table */ 178 179 /* Make sure it is safe to use hashinit(9) on CK_LIST. */ 180 CTASSERT(sizeof(struct in_ifaddrhashhead) == sizeof(LIST_HEAD(, in_addr))); 181 182 #ifdef IPCTL_DEFMTU 183 SYSCTL_INT(_net_inet_ip, IPCTL_DEFMTU, mtu, CTLFLAG_RW, 184 &ip_mtu, 0, "Default MTU"); 185 #endif 186 187 #ifdef IPSTEALTH 188 VNET_DEFINE(int, ipstealth); 189 SYSCTL_INT(_net_inet_ip, OID_AUTO, stealth, CTLFLAG_VNET | CTLFLAG_RW, 190 &VNET_NAME(ipstealth), 0, 191 "IP stealth mode, no TTL decrementation on forwarding"); 192 #endif 193 194 /* 195 * IP statistics are stored in the "array" of counter(9)s. 196 */ 197 VNET_PCPUSTAT_DEFINE(struct ipstat, ipstat); 198 VNET_PCPUSTAT_SYSINIT(ipstat); 199 SYSCTL_VNET_PCPUSTAT(_net_inet_ip, IPCTL_STATS, stats, struct ipstat, ipstat, 200 "IP statistics (struct ipstat, netinet/ip_var.h)"); 201 202 #ifdef VIMAGE 203 VNET_PCPUSTAT_SYSUNINIT(ipstat); 204 #endif /* VIMAGE */ 205 206 /* 207 * Kernel module interface for updating ipstat. The argument is an index 208 * into ipstat treated as an array. 209 */ 210 void 211 kmod_ipstat_inc(int statnum) 212 { 213 214 counter_u64_add(VNET(ipstat)[statnum], 1); 215 } 216 217 void 218 kmod_ipstat_dec(int statnum) 219 { 220 221 counter_u64_add(VNET(ipstat)[statnum], -1); 222 } 223 224 static int 225 sysctl_netinet_intr_queue_maxlen(SYSCTL_HANDLER_ARGS) 226 { 227 int error, qlimit; 228 229 netisr_getqlimit(&ip_nh, &qlimit); 230 error = sysctl_handle_int(oidp, &qlimit, 0, req); 231 if (error || !req->newptr) 232 return (error); 233 if (qlimit < 1) 234 return (EINVAL); 235 return (netisr_setqlimit(&ip_nh, qlimit)); 236 } 237 SYSCTL_PROC(_net_inet_ip, IPCTL_INTRQMAXLEN, intr_queue_maxlen, 238 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 0, 239 sysctl_netinet_intr_queue_maxlen, "I", 240 "Maximum size of the IP input queue"); 241 242 static int 243 sysctl_netinet_intr_queue_drops(SYSCTL_HANDLER_ARGS) 244 { 245 u_int64_t qdrops_long; 246 int error, qdrops; 247 248 netisr_getqdrops(&ip_nh, &qdrops_long); 249 qdrops = qdrops_long; 250 error = sysctl_handle_int(oidp, &qdrops, 0, req); 251 if (error || !req->newptr) 252 return (error); 253 if (qdrops != 0) 254 return (EINVAL); 255 netisr_clearqdrops(&ip_nh); 256 return (0); 257 } 258 259 SYSCTL_PROC(_net_inet_ip, IPCTL_INTRQDROPS, intr_queue_drops, 260 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 261 0, 0, sysctl_netinet_intr_queue_drops, "I", 262 "Number of packets dropped from the IP input queue"); 263 264 #ifdef RSS 265 static int 266 sysctl_netinet_intr_direct_queue_maxlen(SYSCTL_HANDLER_ARGS) 267 { 268 int error, qlimit; 269 270 netisr_getqlimit(&ip_direct_nh, &qlimit); 271 error = sysctl_handle_int(oidp, &qlimit, 0, req); 272 if (error || !req->newptr) 273 return (error); 274 if (qlimit < 1) 275 return (EINVAL); 276 return (netisr_setqlimit(&ip_direct_nh, qlimit)); 277 } 278 SYSCTL_PROC(_net_inet_ip, IPCTL_INTRDQMAXLEN, intr_direct_queue_maxlen, 279 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 280 0, 0, sysctl_netinet_intr_direct_queue_maxlen, 281 "I", "Maximum size of the IP direct input queue"); 282 283 static int 284 sysctl_netinet_intr_direct_queue_drops(SYSCTL_HANDLER_ARGS) 285 { 286 u_int64_t qdrops_long; 287 int error, qdrops; 288 289 netisr_getqdrops(&ip_direct_nh, &qdrops_long); 290 qdrops = qdrops_long; 291 error = sysctl_handle_int(oidp, &qdrops, 0, req); 292 if (error || !req->newptr) 293 return (error); 294 if (qdrops != 0) 295 return (EINVAL); 296 netisr_clearqdrops(&ip_direct_nh); 297 return (0); 298 } 299 300 SYSCTL_PROC(_net_inet_ip, IPCTL_INTRDQDROPS, intr_direct_queue_drops, 301 CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 0, 302 sysctl_netinet_intr_direct_queue_drops, "I", 303 "Number of packets dropped from the IP direct input queue"); 304 #endif /* RSS */ 305 306 /* 307 * IP initialization: fill in IP protocol switch table. 308 * All protocols not implemented in kernel go to raw IP protocol handler. 309 */ 310 static void 311 ip_vnet_init(void *arg __unused) 312 { 313 struct pfil_head_args args; 314 315 CK_STAILQ_INIT(&V_in_ifaddrhead); 316 V_in_ifaddrhashtbl = hashinit(INADDR_NHASH, M_IFADDR, &V_in_ifaddrhmask); 317 318 /* Initialize IP reassembly queue. */ 319 ipreass_vnet_init(); 320 321 /* Initialize packet filter hooks. */ 322 args.pa_version = PFIL_VERSION; 323 args.pa_flags = PFIL_IN | PFIL_OUT; 324 args.pa_type = PFIL_TYPE_IP4; 325 args.pa_headname = PFIL_INET_NAME; 326 V_inet_pfil_head = pfil_head_register(&args); 327 328 args.pa_flags = PFIL_OUT; 329 args.pa_headname = PFIL_INET_LOCAL_NAME; 330 V_inet_local_pfil_head = pfil_head_register(&args); 331 332 if (hhook_head_register(HHOOK_TYPE_IPSEC_IN, AF_INET, 333 &V_ipsec_hhh_in[HHOOK_IPSEC_INET], 334 HHOOK_WAITOK | HHOOK_HEADISINVNET) != 0) 335 printf("%s: WARNING: unable to register input helper hook\n", 336 __func__); 337 if (hhook_head_register(HHOOK_TYPE_IPSEC_OUT, AF_INET, 338 &V_ipsec_hhh_out[HHOOK_IPSEC_INET], 339 HHOOK_WAITOK | HHOOK_HEADISINVNET) != 0) 340 printf("%s: WARNING: unable to register output helper hook\n", 341 __func__); 342 343 #ifdef VIMAGE 344 netisr_register_vnet(&ip_nh); 345 #ifdef RSS 346 netisr_register_vnet(&ip_direct_nh); 347 #endif 348 #endif 349 } 350 VNET_SYSINIT(ip_vnet_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH, 351 ip_vnet_init, NULL); 352 353 static void 354 ip_init(const void *unused __unused) 355 { 356 357 ipreass_init(); 358 359 /* 360 * Register statically compiled protocols, that are unlikely to 361 * ever become dynamic. 362 */ 363 IPPROTO_REGISTER(IPPROTO_ICMP, icmp_input, NULL); 364 IPPROTO_REGISTER(IPPROTO_IGMP, igmp_input, NULL); 365 IPPROTO_REGISTER(IPPROTO_RSVP, rsvp_input, NULL); 366 IPPROTO_REGISTER(IPPROTO_IPV4, encap4_input, NULL); 367 IPPROTO_REGISTER(IPPROTO_MOBILE, encap4_input, NULL); 368 IPPROTO_REGISTER(IPPROTO_ETHERIP, encap4_input, NULL); 369 IPPROTO_REGISTER(IPPROTO_GRE, encap4_input, NULL); 370 IPPROTO_REGISTER(IPPROTO_IPV6, encap4_input, NULL); 371 IPPROTO_REGISTER(IPPROTO_PIM, encap4_input, NULL); 372 #ifdef SCTP /* XXX: has a loadable & static version */ 373 IPPROTO_REGISTER(IPPROTO_SCTP, sctp_input, sctp_ctlinput); 374 #endif 375 376 netisr_register(&ip_nh); 377 #ifdef RSS 378 netisr_register(&ip_direct_nh); 379 #endif 380 } 381 SYSINIT(ip_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, ip_init, NULL); 382 383 #ifdef VIMAGE 384 static void 385 ip_destroy(void *unused __unused) 386 { 387 int error; 388 389 #ifdef RSS 390 netisr_unregister_vnet(&ip_direct_nh); 391 #endif 392 netisr_unregister_vnet(&ip_nh); 393 394 pfil_head_unregister(V_inet_pfil_head); 395 error = hhook_head_deregister(V_ipsec_hhh_in[HHOOK_IPSEC_INET]); 396 if (error != 0) { 397 printf("%s: WARNING: unable to deregister input helper hook " 398 "type HHOOK_TYPE_IPSEC_IN, id HHOOK_IPSEC_INET: " 399 "error %d returned\n", __func__, error); 400 } 401 error = hhook_head_deregister(V_ipsec_hhh_out[HHOOK_IPSEC_INET]); 402 if (error != 0) { 403 printf("%s: WARNING: unable to deregister output helper hook " 404 "type HHOOK_TYPE_IPSEC_OUT, id HHOOK_IPSEC_INET: " 405 "error %d returned\n", __func__, error); 406 } 407 408 /* Remove the IPv4 addresses from all interfaces. */ 409 in_ifscrub_all(); 410 411 /* Make sure the IPv4 routes are gone as well. */ 412 rib_flush_routes_family(AF_INET); 413 414 /* Destroy IP reassembly queue. */ 415 ipreass_destroy(); 416 417 /* Cleanup in_ifaddr hash table; should be empty. */ 418 hashdestroy(V_in_ifaddrhashtbl, M_IFADDR, V_in_ifaddrhmask); 419 } 420 421 VNET_SYSUNINIT(ip, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, ip_destroy, NULL); 422 #endif 423 424 #ifdef RSS 425 /* 426 * IP direct input routine. 427 * 428 * This is called when reinjecting completed fragments where 429 * all of the previous checking and book-keeping has been done. 430 */ 431 void 432 ip_direct_input(struct mbuf *m) 433 { 434 struct ip *ip; 435 int hlen; 436 437 ip = mtod(m, struct ip *); 438 hlen = ip->ip_hl << 2; 439 440 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 441 if (IPSEC_ENABLED(ipv4)) { 442 if (IPSEC_INPUT(ipv4, m, hlen, ip->ip_p) != 0) 443 return; 444 } 445 #endif /* IPSEC */ 446 IPSTAT_INC(ips_delivered); 447 ip_protox[ip->ip_p](&m, &hlen, ip->ip_p); 448 } 449 #endif 450 451 /* 452 * Ip input routine. Checksum and byte swap header. If fragmented 453 * try to reassemble. Process options. Pass to next level. 454 */ 455 void 456 ip_input(struct mbuf *m) 457 { 458 struct ip *ip = NULL; 459 struct in_ifaddr *ia = NULL; 460 struct ifaddr *ifa; 461 struct ifnet *ifp; 462 int hlen = 0; 463 uint16_t sum, ip_len; 464 int dchg = 0; /* dest changed after fw */ 465 struct in_addr odst; /* original dst address */ 466 bool strong_es; 467 468 M_ASSERTPKTHDR(m); 469 NET_EPOCH_ASSERT(); 470 471 if (m->m_flags & M_FASTFWD_OURS) { 472 m->m_flags &= ~M_FASTFWD_OURS; 473 /* Set up some basics that will be used later. */ 474 ip = mtod(m, struct ip *); 475 hlen = ip->ip_hl << 2; 476 ip_len = ntohs(ip->ip_len); 477 goto ours; 478 } 479 480 IPSTAT_INC(ips_total); 481 482 if (__predict_false(m->m_pkthdr.len < sizeof(struct ip))) 483 goto tooshort; 484 485 if (m->m_len < sizeof(struct ip)) { 486 m = m_pullup(m, sizeof(struct ip)); 487 if (__predict_false(m == NULL)) { 488 IPSTAT_INC(ips_toosmall); 489 return; 490 } 491 } 492 ip = mtod(m, struct ip *); 493 494 if (__predict_false(ip->ip_v != IPVERSION)) { 495 IPSTAT_INC(ips_badvers); 496 goto bad; 497 } 498 499 hlen = ip->ip_hl << 2; 500 if (__predict_false(hlen < sizeof(struct ip))) { /* minimum header length */ 501 IPSTAT_INC(ips_badhlen); 502 goto bad; 503 } 504 if (hlen > m->m_len) { 505 m = m_pullup(m, hlen); 506 if (__predict_false(m == NULL)) { 507 IPSTAT_INC(ips_badhlen); 508 return; 509 } 510 ip = mtod(m, struct ip *); 511 } 512 513 IP_PROBE(receive, NULL, NULL, ip, m->m_pkthdr.rcvif, ip, NULL); 514 515 /* IN_LOOPBACK must not appear on the wire - RFC1122 */ 516 ifp = m->m_pkthdr.rcvif; 517 if (IN_LOOPBACK(ntohl(ip->ip_dst.s_addr)) || 518 IN_LOOPBACK(ntohl(ip->ip_src.s_addr))) { 519 if ((ifp->if_flags & IFF_LOOPBACK) == 0) { 520 IPSTAT_INC(ips_badaddr); 521 goto bad; 522 } 523 } 524 /* The unspecified address can appear only as a src address - RFC1122 */ 525 if (__predict_false(ntohl(ip->ip_dst.s_addr) == INADDR_ANY)) { 526 IPSTAT_INC(ips_badaddr); 527 goto bad; 528 } 529 530 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) { 531 sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID); 532 } else { 533 if (hlen == sizeof(struct ip)) { 534 sum = in_cksum_hdr(ip); 535 } else { 536 sum = in_cksum(m, hlen); 537 } 538 } 539 if (__predict_false(sum)) { 540 IPSTAT_INC(ips_badsum); 541 goto bad; 542 } 543 544 ip_len = ntohs(ip->ip_len); 545 if (__predict_false(ip_len < hlen)) { 546 IPSTAT_INC(ips_badlen); 547 goto bad; 548 } 549 550 /* 551 * Check that the amount of data in the buffers 552 * is as at least much as the IP header would have us expect. 553 * Trim mbufs if longer than we expect. 554 * Drop packet if shorter than we expect. 555 */ 556 if (__predict_false(m->m_pkthdr.len < ip_len)) { 557 tooshort: 558 IPSTAT_INC(ips_tooshort); 559 goto bad; 560 } 561 if (m->m_pkthdr.len > ip_len) { 562 if (m->m_len == m->m_pkthdr.len) { 563 m->m_len = ip_len; 564 m->m_pkthdr.len = ip_len; 565 } else 566 m_adj(m, ip_len - m->m_pkthdr.len); 567 } 568 569 /* 570 * Try to forward the packet, but if we fail continue. 571 * ip_tryforward() may generate redirects these days. 572 * XXX the logic below falling through to normal processing 573 * if redirects are required should be revisited as well. 574 * ip_tryforward() does inbound and outbound packet firewall 575 * processing. If firewall has decided that destination becomes 576 * our local address, it sets M_FASTFWD_OURS flag. In this 577 * case skip another inbound firewall processing and update 578 * ip pointer. 579 */ 580 if (V_ipforwarding != 0 581 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 582 && (!IPSEC_ENABLED(ipv4) || 583 IPSEC_CAPS(ipv4, m, IPSEC_CAP_OPERABLE) == 0) 584 #endif 585 ) { 586 /* 587 * ip_dooptions() was run so we can ignore the source route (or 588 * any IP options case) case for redirects in ip_tryforward(). 589 */ 590 if ((m = ip_tryforward(m)) == NULL) 591 return; 592 if (m->m_flags & M_FASTFWD_OURS) { 593 m->m_flags &= ~M_FASTFWD_OURS; 594 ip = mtod(m, struct ip *); 595 goto ours; 596 } 597 } 598 599 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 600 /* 601 * Bypass packet filtering for packets previously handled by IPsec. 602 */ 603 if (IPSEC_ENABLED(ipv4) && 604 IPSEC_CAPS(ipv4, m, IPSEC_CAP_BYPASS_FILTER) != 0) 605 goto passin; 606 #endif 607 608 /* 609 * Run through list of hooks for input packets. 610 * 611 * NB: Beware of the destination address changing (e.g. 612 * by NAT rewriting). When this happens, tell 613 * ip_forward to do the right thing. 614 */ 615 616 /* Jump over all PFIL processing if hooks are not active. */ 617 if (!PFIL_HOOKED_IN(V_inet_pfil_head)) 618 goto passin; 619 620 odst = ip->ip_dst; 621 if (pfil_mbuf_in(V_inet_pfil_head, &m, ifp, NULL) != 622 PFIL_PASS) 623 return; 624 625 ip = mtod(m, struct ip *); 626 dchg = (odst.s_addr != ip->ip_dst.s_addr); 627 628 if (m->m_flags & M_FASTFWD_OURS) { 629 m->m_flags &= ~M_FASTFWD_OURS; 630 goto ours; 631 } 632 if (m->m_flags & M_IP_NEXTHOP) { 633 if (m_tag_find(m, PACKET_TAG_IPFORWARD, NULL) != NULL) { 634 /* 635 * Directly ship the packet on. This allows 636 * forwarding packets originally destined to us 637 * to some other directly connected host. 638 */ 639 ip_forward(m, 1); 640 return; 641 } 642 } 643 passin: 644 645 /* 646 * Process options and, if not destined for us, 647 * ship it on. ip_dooptions returns 1 when an 648 * error was detected (causing an icmp message 649 * to be sent and the original packet to be freed). 650 */ 651 if (hlen > sizeof (struct ip) && ip_dooptions(m, 0)) 652 return; 653 654 /* greedy RSVP, snatches any PATH packet of the RSVP protocol and no 655 * matter if it is destined to another node, or whether it is 656 * a multicast one, RSVP wants it! and prevents it from being forwarded 657 * anywhere else. Also checks if the rsvp daemon is running before 658 * grabbing the packet. 659 */ 660 if (ip->ip_p == IPPROTO_RSVP && V_rsvp_on) 661 goto ours; 662 663 /* 664 * Check our list of addresses, to see if the packet is for us. 665 * If we don't have any addresses, assume any unicast packet 666 * we receive might be for us (and let the upper layers deal 667 * with it). 668 */ 669 if (CK_STAILQ_EMPTY(&V_in_ifaddrhead) && 670 (m->m_flags & (M_MCAST|M_BCAST)) == 0) 671 goto ours; 672 673 /* 674 * Enable a consistency check between the destination address 675 * and the arrival interface for a unicast packet (the RFC 1122 676 * strong ES model) with a list of additional predicates: 677 * - if IP forwarding is disabled 678 * - the packet is not locally generated 679 * - the packet is not subject to 'ipfw fwd' 680 * - Interface is not running CARP. If the packet got here, we already 681 * checked it with carp_iamatch() and carp_forus(). 682 */ 683 strong_es = V_ip_strong_es && (V_ipforwarding == 0) && 684 ((ifp->if_flags & IFF_LOOPBACK) == 0) && 685 ifp->if_carp == NULL && (dchg == 0); 686 687 /* 688 * Check for exact addresses in the hash bucket. 689 */ 690 CK_LIST_FOREACH(ia, INADDR_HASH(ip->ip_dst.s_addr), ia_hash) { 691 if (IA_SIN(ia)->sin_addr.s_addr != ip->ip_dst.s_addr) 692 continue; 693 694 /* 695 * net.inet.ip.rfc1122_strong_es: the address matches, verify 696 * that the packet arrived via the correct interface. 697 */ 698 if (__predict_false(strong_es && ia->ia_ifp != ifp)) { 699 IPSTAT_INC(ips_badaddr); 700 goto bad; 701 } 702 703 /* 704 * net.inet.ip.source_address_validation: drop incoming 705 * packets that pretend to be ours. 706 */ 707 if (V_ip_sav && !(ifp->if_flags & IFF_LOOPBACK) && 708 __predict_false(in_localip_fib(ip->ip_src, ifp->if_fib))) { 709 IPSTAT_INC(ips_badaddr); 710 goto bad; 711 } 712 713 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1); 714 counter_u64_add(ia->ia_ifa.ifa_ibytes, m->m_pkthdr.len); 715 goto ours; 716 } 717 718 /* 719 * Check for broadcast addresses. 720 * 721 * Only accept broadcast packets that arrive via the matching 722 * interface. Reception of forwarded directed broadcasts would 723 * be handled via ip_forward() and ether_output() with the loopback 724 * into the stack for SIMPLEX interfaces handled by ether_output(). 725 */ 726 if (ifp->if_flags & IFF_BROADCAST) { 727 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 728 if (ifa->ifa_addr->sa_family != AF_INET) 729 continue; 730 ia = ifatoia(ifa); 731 if (satosin(&ia->ia_broadaddr)->sin_addr.s_addr == 732 ip->ip_dst.s_addr) { 733 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1); 734 counter_u64_add(ia->ia_ifa.ifa_ibytes, 735 m->m_pkthdr.len); 736 goto ours; 737 } 738 #ifdef BOOTP_COMPAT 739 if (IA_SIN(ia)->sin_addr.s_addr == INADDR_ANY) { 740 counter_u64_add(ia->ia_ifa.ifa_ipackets, 1); 741 counter_u64_add(ia->ia_ifa.ifa_ibytes, 742 m->m_pkthdr.len); 743 goto ours; 744 } 745 #endif 746 } 747 ia = NULL; 748 } 749 if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 750 /* 751 * RFC 3927 2.7: Do not forward multicast packets from 752 * IN_LINKLOCAL. 753 */ 754 if (V_ip_mrouter && !IN_LINKLOCAL(ntohl(ip->ip_src.s_addr))) { 755 /* 756 * If we are acting as a multicast router, all 757 * incoming multicast packets are passed to the 758 * kernel-level multicast forwarding function. 759 * The packet is returned (relatively) intact; if 760 * ip_mforward() returns a non-zero value, the packet 761 * must be discarded, else it may be accepted below. 762 */ 763 if (ip_mforward && ip_mforward(ip, ifp, m, 0) != 0) { 764 IPSTAT_INC(ips_cantforward); 765 m_freem(m); 766 return; 767 } 768 769 /* 770 * The process-level routing daemon needs to receive 771 * all multicast IGMP packets, whether or not this 772 * host belongs to their destination groups. 773 */ 774 if (ip->ip_p == IPPROTO_IGMP) { 775 goto ours; 776 } 777 IPSTAT_INC(ips_forward); 778 } 779 /* 780 * Assume the packet is for us, to avoid prematurely taking 781 * a lock on the in_multi hash. Protocols must perform 782 * their own filtering and update statistics accordingly. 783 */ 784 goto ours; 785 } 786 if (ip->ip_dst.s_addr == (u_long)INADDR_BROADCAST) 787 goto ours; 788 if (ip->ip_dst.s_addr == INADDR_ANY) 789 goto ours; 790 /* RFC 3927 2.7: Do not forward packets to or from IN_LINKLOCAL. */ 791 if (IN_LINKLOCAL(ntohl(ip->ip_dst.s_addr)) || 792 IN_LINKLOCAL(ntohl(ip->ip_src.s_addr))) { 793 IPSTAT_INC(ips_cantforward); 794 m_freem(m); 795 return; 796 } 797 798 /* 799 * Not for us; forward if possible and desirable. 800 */ 801 if (V_ipforwarding == 0) { 802 IPSTAT_INC(ips_cantforward); 803 m_freem(m); 804 } else { 805 ip_forward(m, dchg); 806 } 807 return; 808 809 ours: 810 #ifdef IPSTEALTH 811 /* 812 * IPSTEALTH: Process non-routing options only 813 * if the packet is destined for us. 814 */ 815 if (V_ipstealth && hlen > sizeof (struct ip) && ip_dooptions(m, 1)) 816 return; 817 #endif /* IPSTEALTH */ 818 819 /* 820 * We are going to ship the packet to the local protocol stack. Call the 821 * filter again for this 'output' action, allowing redirect-like rules 822 * to adjust the source address. 823 */ 824 if (PFIL_HOOKED_OUT(V_inet_local_pfil_head)) { 825 if (pfil_mbuf_out(V_inet_local_pfil_head, &m, V_loif, NULL) != 826 PFIL_PASS) 827 return; 828 ip = mtod(m, struct ip *); 829 } 830 831 /* 832 * Attempt reassembly; if it succeeds, proceed. 833 * ip_reass() will return a different mbuf. 834 */ 835 if (ip->ip_off & htons(IP_MF | IP_OFFMASK)) { 836 /* XXXGL: shouldn't we save & set m_flags? */ 837 m = ip_reass(m); 838 if (m == NULL) 839 return; 840 ip = mtod(m, struct ip *); 841 /* Get the header length of the reassembled packet */ 842 hlen = ip->ip_hl << 2; 843 } 844 845 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 846 if (IPSEC_ENABLED(ipv4)) { 847 if (IPSEC_INPUT(ipv4, m, hlen, ip->ip_p) != 0) 848 return; 849 } 850 #endif /* IPSEC */ 851 852 /* 853 * Switch out to protocol's input routine. 854 */ 855 IPSTAT_INC(ips_delivered); 856 857 ip_protox[ip->ip_p](&m, &hlen, ip->ip_p); 858 return; 859 bad: 860 m_freem(m); 861 } 862 863 int 864 ipproto_register(uint8_t proto, ipproto_input_t input, ipproto_ctlinput_t ctl) 865 { 866 867 MPASS(proto > 0); 868 869 /* 870 * The protocol slot must not be occupied by another protocol 871 * already. An index pointing to rip_input() is unused. 872 */ 873 if (ip_protox[proto] == rip_input) { 874 ip_protox[proto] = input; 875 ip_ctlprotox[proto] = ctl; 876 return (0); 877 } else 878 return (EEXIST); 879 } 880 881 int 882 ipproto_unregister(uint8_t proto) 883 { 884 885 MPASS(proto > 0); 886 887 if (ip_protox[proto] != rip_input) { 888 ip_protox[proto] = rip_input; 889 ip_ctlprotox[proto] = rip_ctlinput; 890 return (0); 891 } else 892 return (ENOENT); 893 } 894 895 /* 896 * Forward a packet. If some error occurs return the sender 897 * an icmp packet. Note we can't always generate a meaningful 898 * icmp message because icmp doesn't have a large enough repertoire 899 * of codes and types. 900 * 901 * If not forwarding, just drop the packet. This could be confusing 902 * if ipforwarding was zero but some routing protocol was advancing 903 * us as a gateway to somewhere. However, we must let the routing 904 * protocol deal with that. 905 * 906 * The srcrt parameter indicates whether the packet is being forwarded 907 * via a source route. 908 */ 909 void 910 ip_forward(struct mbuf *m, int srcrt) 911 { 912 struct ip *ip = mtod(m, struct ip *); 913 struct in_ifaddr *ia; 914 struct mbuf *mcopy; 915 struct sockaddr_in *sin; 916 struct in_addr dest; 917 struct route ro; 918 uint32_t flowid; 919 int error, type = 0, code = 0, mtu = 0; 920 921 NET_EPOCH_ASSERT(); 922 923 if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) { 924 IPSTAT_INC(ips_cantforward); 925 m_freem(m); 926 return; 927 } 928 if ( 929 #ifdef IPSTEALTH 930 V_ipstealth == 0 && 931 #endif 932 ip->ip_ttl <= IPTTLDEC) { 933 icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, 0, 0); 934 return; 935 } 936 937 bzero(&ro, sizeof(ro)); 938 sin = (struct sockaddr_in *)&ro.ro_dst; 939 sin->sin_family = AF_INET; 940 sin->sin_len = sizeof(*sin); 941 sin->sin_addr = ip->ip_dst; 942 flowid = m->m_pkthdr.flowid; 943 ro.ro_nh = fib4_lookup(M_GETFIB(m), ip->ip_dst, 0, NHR_REF, flowid); 944 if (ro.ro_nh != NULL) { 945 ia = ifatoia(ro.ro_nh->nh_ifa); 946 } else 947 ia = NULL; 948 /* 949 * Save the IP header and at most 8 bytes of the payload, 950 * in case we need to generate an ICMP message to the src. 951 * 952 * XXX this can be optimized a lot by saving the data in a local 953 * buffer on the stack (72 bytes at most), and only allocating the 954 * mbuf if really necessary. The vast majority of the packets 955 * are forwarded without having to send an ICMP back (either 956 * because unnecessary, or because rate limited), so we are 957 * really we are wasting a lot of work here. 958 * 959 * We don't use m_copym() because it might return a reference 960 * to a shared cluster. Both this function and ip_output() 961 * assume exclusive access to the IP header in `m', so any 962 * data in a cluster may change before we reach icmp_error(). 963 */ 964 mcopy = m_gethdr(M_NOWAIT, m->m_type); 965 if (mcopy != NULL && !m_dup_pkthdr(mcopy, m, M_NOWAIT)) { 966 /* 967 * It's probably ok if the pkthdr dup fails (because 968 * the deep copy of the tag chain failed), but for now 969 * be conservative and just discard the copy since 970 * code below may some day want the tags. 971 */ 972 m_free(mcopy); 973 mcopy = NULL; 974 } 975 if (mcopy != NULL) { 976 mcopy->m_len = min(ntohs(ip->ip_len), M_TRAILINGSPACE(mcopy)); 977 mcopy->m_pkthdr.len = mcopy->m_len; 978 m_copydata(m, 0, mcopy->m_len, mtod(mcopy, caddr_t)); 979 } 980 #ifdef IPSTEALTH 981 if (V_ipstealth == 0) 982 #endif 983 ip->ip_ttl -= IPTTLDEC; 984 #if defined(IPSEC) || defined(IPSEC_SUPPORT) 985 if (IPSEC_ENABLED(ipv4)) { 986 if ((error = IPSEC_FORWARD(ipv4, m)) != 0) { 987 /* mbuf consumed by IPsec */ 988 RO_NHFREE(&ro); 989 m_freem(mcopy); 990 if (error != EINPROGRESS) 991 IPSTAT_INC(ips_cantforward); 992 return; 993 } 994 /* No IPsec processing required */ 995 } 996 #endif /* IPSEC */ 997 /* 998 * If forwarding packet using same interface that it came in on, 999 * perhaps should send a redirect to sender to shortcut a hop. 1000 * Only send redirect if source is sending directly to us, 1001 * and if packet was not source routed (or has any options). 1002 * Also, don't send redirect if forwarding using a default route 1003 * or a route modified by a redirect. 1004 */ 1005 dest.s_addr = 0; 1006 if (!srcrt && V_ipsendredirects && 1007 ia != NULL && ia->ia_ifp == m->m_pkthdr.rcvif) { 1008 struct nhop_object *nh; 1009 1010 nh = ro.ro_nh; 1011 1012 if (nh != NULL && ((nh->nh_flags & (NHF_REDIRECT|NHF_DEFAULT)) == 0)) { 1013 struct in_ifaddr *nh_ia = (struct in_ifaddr *)(nh->nh_ifa); 1014 u_long src = ntohl(ip->ip_src.s_addr); 1015 1016 if (nh_ia != NULL && 1017 (src & nh_ia->ia_subnetmask) == nh_ia->ia_subnet) { 1018 /* Router requirements says to only send host redirects */ 1019 type = ICMP_REDIRECT; 1020 code = ICMP_REDIRECT_HOST; 1021 if (nh->nh_flags & NHF_GATEWAY) { 1022 if (nh->gw_sa.sa_family == AF_INET) 1023 dest.s_addr = nh->gw4_sa.sin_addr.s_addr; 1024 else /* Do not redirect in case gw is AF_INET6 */ 1025 type = 0; 1026 } else 1027 dest.s_addr = ip->ip_dst.s_addr; 1028 } 1029 } 1030 } 1031 1032 error = ip_output(m, NULL, &ro, IP_FORWARDING, NULL, NULL); 1033 1034 if (error == EMSGSIZE && ro.ro_nh) 1035 mtu = ro.ro_nh->nh_mtu; 1036 RO_NHFREE(&ro); 1037 1038 if (error) 1039 IPSTAT_INC(ips_cantforward); 1040 else { 1041 IPSTAT_INC(ips_forward); 1042 if (type) 1043 IPSTAT_INC(ips_redirectsent); 1044 else { 1045 if (mcopy) 1046 m_freem(mcopy); 1047 return; 1048 } 1049 } 1050 if (mcopy == NULL) 1051 return; 1052 1053 switch (error) { 1054 case 0: /* forwarded, but need redirect */ 1055 /* type, code set above */ 1056 break; 1057 1058 case ENETUNREACH: 1059 case EHOSTUNREACH: 1060 case ENETDOWN: 1061 case EHOSTDOWN: 1062 default: 1063 type = ICMP_UNREACH; 1064 code = ICMP_UNREACH_HOST; 1065 break; 1066 1067 case EMSGSIZE: 1068 type = ICMP_UNREACH; 1069 code = ICMP_UNREACH_NEEDFRAG; 1070 /* 1071 * If the MTU was set before make sure we are below the 1072 * interface MTU. 1073 * If the MTU wasn't set before use the interface mtu or 1074 * fall back to the next smaller mtu step compared to the 1075 * current packet size. 1076 */ 1077 if (mtu != 0) { 1078 if (ia != NULL) 1079 mtu = min(mtu, ia->ia_ifp->if_mtu); 1080 } else { 1081 if (ia != NULL) 1082 mtu = ia->ia_ifp->if_mtu; 1083 else 1084 mtu = ip_next_mtu(ntohs(ip->ip_len), 0); 1085 } 1086 IPSTAT_INC(ips_cantfrag); 1087 break; 1088 1089 case ENOBUFS: 1090 case EACCES: /* ipfw denied packet */ 1091 m_freem(mcopy); 1092 return; 1093 } 1094 icmp_error(mcopy, type, code, dest.s_addr, mtu); 1095 } 1096 1097 #define CHECK_SO_CT(sp, ct) \ 1098 (((sp->so_options & SO_TIMESTAMP) && (sp->so_ts_clock == ct)) ? 1 : 0) 1099 1100 void 1101 ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip, 1102 struct mbuf *m) 1103 { 1104 bool stamped; 1105 1106 stamped = false; 1107 if ((inp->inp_socket->so_options & SO_BINTIME) || 1108 CHECK_SO_CT(inp->inp_socket, SO_TS_BINTIME)) { 1109 struct bintime boottimebin, bt; 1110 struct timespec ts1; 1111 1112 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1113 M_TSTMP)) { 1114 mbuf_tstmp2timespec(m, &ts1); 1115 timespec2bintime(&ts1, &bt); 1116 getboottimebin(&boottimebin); 1117 bintime_add(&bt, &boottimebin); 1118 } else { 1119 bintime(&bt); 1120 } 1121 *mp = sbcreatecontrol(&bt, sizeof(bt), SCM_BINTIME, 1122 SOL_SOCKET, M_NOWAIT); 1123 if (*mp != NULL) { 1124 mp = &(*mp)->m_next; 1125 stamped = true; 1126 } 1127 } 1128 if (CHECK_SO_CT(inp->inp_socket, SO_TS_REALTIME_MICRO)) { 1129 struct bintime boottimebin, bt1; 1130 struct timespec ts1; 1131 struct timeval tv; 1132 1133 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1134 M_TSTMP)) { 1135 mbuf_tstmp2timespec(m, &ts1); 1136 timespec2bintime(&ts1, &bt1); 1137 getboottimebin(&boottimebin); 1138 bintime_add(&bt1, &boottimebin); 1139 bintime2timeval(&bt1, &tv); 1140 } else { 1141 microtime(&tv); 1142 } 1143 *mp = sbcreatecontrol((caddr_t)&tv, sizeof(tv), SCM_TIMESTAMP, 1144 SOL_SOCKET, M_NOWAIT); 1145 if (*mp != NULL) { 1146 mp = &(*mp)->m_next; 1147 stamped = true; 1148 } 1149 } else if (CHECK_SO_CT(inp->inp_socket, SO_TS_REALTIME)) { 1150 struct bintime boottimebin; 1151 struct timespec ts, ts1; 1152 1153 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1154 M_TSTMP)) { 1155 mbuf_tstmp2timespec(m, &ts); 1156 getboottimebin(&boottimebin); 1157 bintime2timespec(&boottimebin, &ts1); 1158 timespecadd(&ts, &ts1, &ts); 1159 } else { 1160 nanotime(&ts); 1161 } 1162 *mp = sbcreatecontrol(&ts, sizeof(ts), SCM_REALTIME, 1163 SOL_SOCKET, M_NOWAIT); 1164 if (*mp != NULL) { 1165 mp = &(*mp)->m_next; 1166 stamped = true; 1167 } 1168 } else if (CHECK_SO_CT(inp->inp_socket, SO_TS_MONOTONIC)) { 1169 struct timespec ts; 1170 1171 if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1172 M_TSTMP)) 1173 mbuf_tstmp2timespec(m, &ts); 1174 else 1175 nanouptime(&ts); 1176 *mp = sbcreatecontrol(&ts, sizeof(ts), SCM_MONOTONIC, 1177 SOL_SOCKET, M_NOWAIT); 1178 if (*mp != NULL) { 1179 mp = &(*mp)->m_next; 1180 stamped = true; 1181 } 1182 } 1183 if (stamped && (m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR | 1184 M_TSTMP)) { 1185 struct sock_timestamp_info sti; 1186 1187 bzero(&sti, sizeof(sti)); 1188 sti.st_info_flags = ST_INFO_HW; 1189 if ((m->m_flags & M_TSTMP_HPREC) != 0) 1190 sti.st_info_flags |= ST_INFO_HW_HPREC; 1191 *mp = sbcreatecontrol(&sti, sizeof(sti), SCM_TIME_INFO, 1192 SOL_SOCKET, M_NOWAIT); 1193 if (*mp != NULL) 1194 mp = &(*mp)->m_next; 1195 } 1196 if (inp->inp_flags & INP_RECVDSTADDR) { 1197 *mp = sbcreatecontrol(&ip->ip_dst, sizeof(struct in_addr), 1198 IP_RECVDSTADDR, IPPROTO_IP, M_NOWAIT); 1199 if (*mp) 1200 mp = &(*mp)->m_next; 1201 } 1202 if (inp->inp_flags & INP_RECVTTL) { 1203 *mp = sbcreatecontrol(&ip->ip_ttl, sizeof(u_char), IP_RECVTTL, 1204 IPPROTO_IP, M_NOWAIT); 1205 if (*mp) 1206 mp = &(*mp)->m_next; 1207 } 1208 #ifdef notyet 1209 /* XXX 1210 * Moving these out of udp_input() made them even more broken 1211 * than they already were. 1212 */ 1213 /* options were tossed already */ 1214 if (inp->inp_flags & INP_RECVOPTS) { 1215 *mp = sbcreatecontrol(opts_deleted_above, 1216 sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP, M_NOWAIT); 1217 if (*mp) 1218 mp = &(*mp)->m_next; 1219 } 1220 /* ip_srcroute doesn't do what we want here, need to fix */ 1221 if (inp->inp_flags & INP_RECVRETOPTS) { 1222 *mp = sbcreatecontrol(ip_srcroute(m), sizeof(struct in_addr), 1223 IP_RECVRETOPTS, IPPROTO_IP, M_NOWAIT); 1224 if (*mp) 1225 mp = &(*mp)->m_next; 1226 } 1227 #endif 1228 if (inp->inp_flags & INP_RECVIF) { 1229 struct ifnet *ifp; 1230 struct sdlbuf { 1231 struct sockaddr_dl sdl; 1232 u_char pad[32]; 1233 } sdlbuf; 1234 struct sockaddr_dl *sdp; 1235 struct sockaddr_dl *sdl2 = &sdlbuf.sdl; 1236 1237 if ((ifp = m->m_pkthdr.rcvif)) { 1238 sdp = (struct sockaddr_dl *)ifp->if_addr->ifa_addr; 1239 /* 1240 * Change our mind and don't try copy. 1241 */ 1242 if (sdp->sdl_family != AF_LINK || 1243 sdp->sdl_len > sizeof(sdlbuf)) { 1244 goto makedummy; 1245 } 1246 bcopy(sdp, sdl2, sdp->sdl_len); 1247 } else { 1248 makedummy: 1249 sdl2->sdl_len = 1250 offsetof(struct sockaddr_dl, sdl_data[0]); 1251 sdl2->sdl_family = AF_LINK; 1252 sdl2->sdl_index = 0; 1253 sdl2->sdl_nlen = sdl2->sdl_alen = sdl2->sdl_slen = 0; 1254 } 1255 *mp = sbcreatecontrol(sdl2, sdl2->sdl_len, IP_RECVIF, 1256 IPPROTO_IP, M_NOWAIT); 1257 if (*mp) 1258 mp = &(*mp)->m_next; 1259 } 1260 if (inp->inp_flags & INP_RECVTOS) { 1261 *mp = sbcreatecontrol(&ip->ip_tos, sizeof(u_char), IP_RECVTOS, 1262 IPPROTO_IP, M_NOWAIT); 1263 if (*mp) 1264 mp = &(*mp)->m_next; 1265 } 1266 1267 if (inp->inp_flags2 & INP_RECVFLOWID) { 1268 uint32_t flowid, flow_type; 1269 1270 flowid = m->m_pkthdr.flowid; 1271 flow_type = M_HASHTYPE_GET(m); 1272 1273 /* 1274 * XXX should handle the failure of one or the 1275 * other - don't populate both? 1276 */ 1277 *mp = sbcreatecontrol(&flowid, sizeof(uint32_t), IP_FLOWID, 1278 IPPROTO_IP, M_NOWAIT); 1279 if (*mp) 1280 mp = &(*mp)->m_next; 1281 *mp = sbcreatecontrol(&flow_type, sizeof(uint32_t), 1282 IP_FLOWTYPE, IPPROTO_IP, M_NOWAIT); 1283 if (*mp) 1284 mp = &(*mp)->m_next; 1285 } 1286 1287 #ifdef RSS 1288 if (inp->inp_flags2 & INP_RECVRSSBUCKETID) { 1289 uint32_t flowid, flow_type; 1290 uint32_t rss_bucketid; 1291 1292 flowid = m->m_pkthdr.flowid; 1293 flow_type = M_HASHTYPE_GET(m); 1294 1295 if (rss_hash2bucket(flowid, flow_type, &rss_bucketid) == 0) { 1296 *mp = sbcreatecontrol(&rss_bucketid, sizeof(uint32_t), 1297 IP_RSSBUCKETID, IPPROTO_IP, M_NOWAIT); 1298 if (*mp) 1299 mp = &(*mp)->m_next; 1300 } 1301 } 1302 #endif 1303 } 1304 1305 /* 1306 * XXXRW: Multicast routing code in ip_mroute.c is generally MPSAFE, but the 1307 * ip_rsvp and ip_rsvp_on variables need to be interlocked with rsvp_on 1308 * locking. This code remains in ip_input.c as ip_mroute.c is optionally 1309 * compiled. 1310 */ 1311 VNET_DEFINE_STATIC(int, ip_rsvp_on); 1312 VNET_DEFINE(struct socket *, ip_rsvpd); 1313 1314 #define V_ip_rsvp_on VNET(ip_rsvp_on) 1315 1316 int 1317 ip_rsvp_init(struct socket *so) 1318 { 1319 1320 if (V_ip_rsvpd != NULL) 1321 return EADDRINUSE; 1322 1323 V_ip_rsvpd = so; 1324 /* 1325 * This may seem silly, but we need to be sure we don't over-increment 1326 * the RSVP counter, in case something slips up. 1327 */ 1328 if (!V_ip_rsvp_on) { 1329 V_ip_rsvp_on = 1; 1330 V_rsvp_on++; 1331 } 1332 1333 return 0; 1334 } 1335 1336 int 1337 ip_rsvp_done(void) 1338 { 1339 1340 V_ip_rsvpd = NULL; 1341 /* 1342 * This may seem silly, but we need to be sure we don't over-decrement 1343 * the RSVP counter, in case something slips up. 1344 */ 1345 if (V_ip_rsvp_on) { 1346 V_ip_rsvp_on = 0; 1347 V_rsvp_on--; 1348 } 1349 return 0; 1350 } 1351 1352 int 1353 rsvp_input(struct mbuf **mp, int *offp, int proto) 1354 { 1355 struct mbuf *m; 1356 1357 m = *mp; 1358 *mp = NULL; 1359 1360 if (rsvp_input_p) { /* call the real one if loaded */ 1361 *mp = m; 1362 rsvp_input_p(mp, offp, proto); 1363 return (IPPROTO_DONE); 1364 } 1365 1366 /* Can still get packets with rsvp_on = 0 if there is a local member 1367 * of the group to which the RSVP packet is addressed. But in this 1368 * case we want to throw the packet away. 1369 */ 1370 1371 if (!V_rsvp_on) { 1372 m_freem(m); 1373 return (IPPROTO_DONE); 1374 } 1375 1376 if (V_ip_rsvpd != NULL) { 1377 *mp = m; 1378 rip_input(mp, offp, proto); 1379 return (IPPROTO_DONE); 1380 } 1381 /* Drop the packet */ 1382 m_freem(m); 1383 return (IPPROTO_DONE); 1384 } 1385